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<h3>
Ben Gamari pushed to branch wip/freebsd-ci
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0462b0e02d8759983484eb09d0ba1be134ec592e">0462b0e0</a></strong>
<div>
<span>by Alexandre Baldé</span>
<i>at 2019-06-09T11:48:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Explain that 'mappend' and '(<>)' should be the same [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/970e480230bc8422d9bd9a6f1011def86befc34a">970e4802</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-06-09T11:49:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Properly partition options in sourceArgs
Previously if you build the `ghc` package then it would has the default
opts and the library opts. This is different behaviour to make where the
library opts are only reserved for things in the `libraries`
subdirectory (I believe)
Fixes #16716
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a018c3a84c88f6208e7bd5587af1cdf40c2ae991">a018c3a8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-09T11:49:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Suppress ticks in T4918 output
As noted in #16741, this test otherwise breaks when `base` is compiled
with `-g`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f737033329817335bc01ab16a385b4b5ec5b3b5d">f7370333</a></strong>
<div>
<span>by chessai</span>
<i>at 2019-06-09T18:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce log1p and expm1 primops
Previously log and exp were primitives yet log1p and expm1 were FFI
calls. Fix this non-uniformity.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41bf4045c5a85651db8ceb631a1b67edec0c1216">41bf4045</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-09T18:41:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #16514
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9fe91fce5cf5ab233ab48a64e6a49caf1beced3">b9fe91fc</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2019-06-09T18:42:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small refactorings in ExtractDocs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9d238791862e8b128d397a1c0317986ea82ed000">9d238791</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-06-09T18:42:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle trailing path separator in package DB names (#16360)
Package DB directories with trailing separator (provided via
GHC_PACKAGE_PATH or via -package-db) resulted in incorrect calculation of
${pkgroot} substitution variable. Keep the trailing separator while
resolving as directory or file, but remove it before dropping the last
path component with takeDirectory.
Closes #16360.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff">a22e51ea</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-06-09T18:43:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16517 by bumping the TcLevel for method sigs
There were actually two bugs fixed here:
1. candidateQTyVarsOfType needs to be careful that it does not
try to zap metavariables from an outer scope as "naughty"
quantification candidates. This commit adds a simple check
to avoid doing so.
2. We weren't bumping the TcLevel in kcHsKindSig, which was used
only for class method sigs. This mistake led to the acceptance
of
class C a where
meth :: forall k. Proxy (a :: k) -> ()
Note that k is *locally* quantified. This patch fixes the
problem by using tcClassSigType, which correctly bumps the
level. It's a bit inefficient because tcClassSigType does other
work, too, but it would be tedious to repeat much of the code
there with only a few changes. This version works well and is
simple.
And, while updating comments, etc., I noticed that tcRnType was
missing a pushTcLevel, leading to #16767, which this patch also
fixes, by bumping the level. In the refactoring here, I also
use solveEqualities. This initially failed ghci/scripts/T15415,
but that was fixed by teaching solveEqualities to respect
-XPartialTypeSignatures.
This patch also cleans up some Notes around error generation that
came up in conversation.
Test case: typecheck/should_fail/T16517, ghci/scripts/T16767
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10452959136fbf271ac21eb0740030c046db36e1">10452959</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-06-09T18:44:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add disable/enable commands to ghci debugger #2215
This patch adds two new commands `:enable` and `:disable` to the GHCi debugger.
Opposite to `:set stop <n> :continue` a breakpoint disabled with `:disable` will
not loose its previously set stop command.
A new field breakEnabled is added to the BreakLocation data structure to
track the enable/disable state. When a breakpoint is disabled with a `:disable`
command, the following happens:
The corresponding BreakLocation data element is searched dictionary of the
`breaks` field of the GHCiStateMonad. If the break point is found and not
already in the disabled state, the breakpoint is removed from bytecode.
The BreakLocation data structure is kept in the breaks list and the new
breakEnabled field is set to false.
The `:enable` command works similar.
The breaks field in the GHCiStateMonad was changed from an association list
to int `IntMap`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13572480cbb8588033a60c675bec0cdae382fb91">13572480</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-09T18:44:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Separate population of eventTypes from initial event generation
Previously these two orthogonal concerns were both implemented in
postHeaderEvents which made it difficult to send header events after RTS
initialization.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed20412a8ce7578d073461892c9643591c6993a5">ed20412a</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-06-09T18:45:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not report error if Name in pragma is unbound
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a48a8a4e2f14f7f01aa1d4cf249420c908edb73">8a48a8a4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-09T18:46:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #16509
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69c58f8abbb0b51eca1f0004a8d8c1cee0c8f766">69c58f8a</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2019-06-09T18:46:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: need CPP preprocessor dependencies #16660
Use the new -include-cpp-deps ghc option (#16521)
when generating .dependencies files in hadrian.
This is version gated as -include-cpp-deps is a
relatively new option.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c7bb03db5956e8c56260ba0bbc8271afe073a01">1c7bb03d</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-06-09T18:47:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only: document tcdDataCusk better.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5023adceeb59e9a2b57cda2e69cd2a6152a13ead">5023adce</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-06-09T18:47:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove CPP ensuring word size is 32 or 64 bits around Addr# <-> int# primops
It shouldn't be needed these days, and those primops are "highly
deprecated" anyways.
This fits with my plans because it removes one bit of target-dependence
of the builtin primops, and this is the hardest part of GHC to make
multi-target.
CC @carter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e60e3f0c6c1482f448dd4d24d716d34046503e9">8e60e3f0</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-06-09T18:48:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix RetainerProfile early return with TREC_CHUNK
When pop() returns with `*c == NULL` retainerProfile will immediately
return. All other code paths is pop() continue with the next stackElement
when this happens so it seems weird to me that TREC_CHUNK we would suddenly
abort everything even though the stack might still have elements left to
process.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a3420cabdcf6d7d90c154681230f1150604c097">1a3420ca</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-10T07:59:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Mark CPUTime001 as fragile
As noted in #16224, CPUTime001 has been quite problematic, reporting
non-monotonic timestamps in CI. Unfortunately I've been unable to
reproduce this locally.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9bc10993bb300d3712b0f13ec6e28621d75d4204">9bc10993</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-06-10T08:00:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Print role annotations in TemplateHaskell brackets (#16718)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0345b1b0f62c8fac72d07a7b848d14b9893e9ac9">0345b1b0</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-06-10T23:52:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only: document newtypes' DataConWrapId
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58a5d728d0293110d7e80aa1f067721447b20882">58a5d728</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2019-06-10T23:52:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the rules for .hi and .o into a single rule using `&%>` #16764
Currently the rule for .hi files just triggers (via need) the rule
for the .o file, and .o rule generates both the .o and .hi file.
Likewise for .o-boot and .hi-boot files. This is a bit of an abuse
of Shake, and in fact shake supports rules with multiple output
with the &%> function. This exact use case appears in Neil
Mitchell's paper *Shake Before Building* section 6.3.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f9450864b355269a102216292f2034f0f7bedda">2f945086</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-10T23:53:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix and extend closure_size test
This was previously broken in several ways. This is fixed and it also
now tests arrays. Unfortunately I was unable to find a way to continue
testing PAP and FUN sizes; these simply depend too much upon the
behavior of the simplifier.
I also tried to extend this to test non-empty arrays as well but
unfortunately this was non-trivial as the array card size constant isn't
readily available from haskell.
Fixes #16531.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5d275f45677ed89df310754973a15c522dc1003">e5d275f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-10T23:53:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-heap: Add closure_size_noopt test
This adds a new test, only run in the `normal` way, to verify the size
of FUNs and PAPs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe7e7e4a950a77326cc16f4ade30a67d20d7cdd5">fe7e7e4a</a></strong>
<div>
<span>by Yuras Shumovich</span>
<i>at 2019-06-11T18:39:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Warn about unused packages
Reviewers: bgamari, simonpj
Reviewed By: simonpj
Subscribers: hvr, simonpj, mpickering, rwbarton, carter
GHC Trac Issues: #15838
Differential Revision: https://phabricator.haskell.org/D5285
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39f50bff3ea913a7f4b1d915660bcf77b9327e2e">39f50bff</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-11T18:40:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refine the GHCI macro into HAVE[_{INTERNAL, EXTERNAL}]_INTERPRETER
As discussed in #16331, the GHCI macro, defined through 'ghci' flags
in ghc.cabal.in, ghc-bin.cabal.in and ghci.cabal.in, is supposed to indicate
whether GHC is built with support for an internal interpreter, that runs in
the same process. It is however overloaded in a few places to mean
"there is an interpreter available", regardless of whether it's an internal
or external interpreter.
For the sake of clarity and with the hope of more easily being able to
build stage 1 GHCs with external interpreter support, this patch splits
the previous GHCI macro into 3 different ones:
- HAVE_INTERNAL_INTERPRETER: GHC is built with an internal interpreter
- HAVE_EXTERNAL_INTERPRETER: GHC is built with support for external interpreters
- HAVE_INTERPRETER: HAVE_INTERNAL_INTERPRETER || HAVE_EXTERNAL_INTERPRETER
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/45616133efba0c17a461ecf085427b7956250fad">45616133</a></strong>
<div>
<span>by Alec Theriault</span>
<i>at 2019-06-11T18:41:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `haddock_testsuite` respect `--test-accept`
Suppose you've made changes that affect the output of `haddockHtmlTest`
so that the following is failing:
./hadrian/build.sh -c --only=haddockHtmlTest test
Then, the following will accept new output for Haddock's test cases.
./hadrian/build.sh -c --only=haddockHtmlTest test --test-accept
You still do need to make sure those new changes (which show up in
Haddock's tree) get committed though.
Fixes #16694
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/762098bf2cfac657c0320249f62dc49bad77f7bf">762098bf</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-11T18:41:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/RtsFlags.c: mention that -prof too enables support for +RTS -l
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/457fe7897d42e4359b6da6b359fd7ea8ae0f1d75">457fe789</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-11T18:42:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: teach the RTS that PROFILING implies TRACING
As discussed in #16744, both the Make and Hadrian build systems
have special code to always pass -eventlog whenever -prof or -debug
are passed. However, there is some similar logic in the RTS itself only
for defining TRACING when the DEBUG macro is defined, but no such logic
is implemented to define TRACING when the PROFILING macro is defined.
This patch adds such a logic and therefore fixes #16744.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf7f36ae5e0ceee1c37a4c38464209f04647a470">cf7f36ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-11T18:43:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Mmap into low memory on AArch64
This extends mmapForLinker to use the same low-memory mapping
strategy used on x86_64 on AArch64. See #16784.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b7f81f560c602f32cfc90fd3fb5f1c52f06ad49">0b7f81f5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-11T18:43:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Use mmapForLinker to map PLT
The PLT needs to be located within a close distance of
the code calling it under the small memory model.
Fixes #16784.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1389b2ccdecb0ea7a8982884512dbf7175a52042">1389b2cc</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-11T18:43:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix an error message in CheckUnload.c:searchHeapBlocks
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aad6115aed884db9ed47ac602ca1bd3b953ea089">aad6115a</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-11T18:44:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/mk/boilerplate.mk: rename 'ghc-config-mk' to 'ghc_config_mk'
Make/shell variable names which contain dashes can cause problems under
some conditions. The 'ghc-config-mk' variable from testsuite/mk/boilerplate.mk
that I made overridable (by Hadrian) in ba0aed2e was working as expected when
our Hadrian/Linux job was based off the deb8 Docker image, but broke when
I switched the job to use our deb9-based image, in 3d97bad6. The exact
circumstances/tool versions that trigger this problem are unknown, but
changing the variable's name to 'ghc_config_mk' lets us work around the issue.
This fixes the annth_compunits and annth_make test failures that showed up
when we switched the Hadrian/Linux job to use the deb9 environment.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b4ff57d71eebf6dd71a5d81d0f9c9c2aef80e65">9b4ff57d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T07:35:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvm-targets: Add armv7l-unknown-linux-gnueabi
Fixes #15208.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c05ca251620ff2589f21192208a1e500285eb5c3">c05ca251</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T07:36:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add haddock perf test output to gitignore
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bbc752c50f3adcb659cd8447635828e137a0a314">bbc752c5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T07:36:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Make elf_got.c a bit more legible
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/217e6db4af6752b13c586d4e8925a4a9a2f47245">217e6db4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T07:36:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Only mprotect GOT after it is filled
This fixes a regression, introduced by 67c422ca, where we mprotect'd the
global offset table (GOT) region to PROT_READ before we had finished
filling it, resulting in a linker crash.
Fixes #16779.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1219f8e8a3d1b58263bea76822322b746a632778">1219f8e8</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-06-12T07:37:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use DeriveFunctor throughout the codebase (#15654)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd2d13ff778a4b1b5d793c99229cccfb64d792f3">bd2d13ff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump binary to 0.8.7.0
(cherry picked from commit 983ada70a013c7642a751f6e41587ff95b57d0f8)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/381c3ae31b68019177f1cd20cb4da2f9d3b7d6c6">381c3ae3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal submodule
(cherry picked from commit ff438786613f07df9b2d43eaeac49b13815d849d)
Metric Increase:
haddock.Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0354c7ded874f18c177e9154615c9dfdf1d99d8a">0354c7de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump time submodule to 1.9.3
(cherry picked from commit fdb07571036b1498800589d45b61781e6acdd368)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0b16eaa856bc126ee6676b0c5e40fb01c6558f6">e0b16eaa</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump terminfo to 0.4.1.4
(cherry picked from commit 1134488b4c9cef904ea82f22f1978646eea612df)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ce320b07ca9171d132b748ecbc3d7fdee4840b8">2ce320b0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Test using slowtest in deb9-debug job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90e7c450ce9b9b1ec36ea12ef8041d8e7f192c36">90e7c450</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark hWaitForInput-accurate-stdin as broken in threaded ways
As noted in #16535.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/488187f81babf0b0937aec0c81b132563cbbec4e">488187f8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T13167 as fragile in threaded2
As noted in #16536.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b5833208bdbac027c960da13bb4184125d596a5">9b583320</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T13910 as broken in optasm
Due to #16537.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb644865b1f5723ddc4e5a1c0187a116fa4cb175">eb644865</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T14761c as broken in hpc, profasm, and optasm ways
As noted in #16540.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a204e07119ed81fc593457372229bef26f48dbe">1a204e07</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T16180 as broken in ghci and ext-interp ways
As noted in #16541.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d482e45590d01e6779f6f675911ffa1067ad981">8d482e45</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Omit tcrun022 in hpc way
As noted in #16542, the expected rule doesn't fire. However, this
doesn't seem terribly surpring given the circumstances.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68cfdfdb8775ff28a20131248beec7ac0906aeac">68cfdfdb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark Overflow as broken in hpc way
As noted in #16543.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a3929a4fa7d38153ba8ced674af78e073d3078aa">a3929a4f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T2783 as fragile in threaded1
It was previously marked as broken but it passes non-deterministically.
See #2783.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7ed32f2a147007a224928534a7c461e5a6d429">bb7ed32f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip T7919 in ghci way
It times out pretty reliably. It's not clear that much is gained by
running this test in the ghci way anyways.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/329dcd7a59e7d46cb5110e1dfb9f8b7f50f0e3a2">329dcd7a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix fragile_for test modifier
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55b5bb14b9a2487bab80411776ae34c143eddb1a">55b5bb14</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix omit_ways usage
omit_ways expects a list but this was broken in several cases.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/264ad286086041f52d841ff4fe7c342a242b033d">264ad286</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark threadstatus-T9333 as fragile in ghci way
As noted in #16555.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/587bef669c600a0e5b57d69c971304dc9c8b9923">587bef66</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Omit profasm way for cc017
cc017 requires TH but we can't load dynamic profiled objects.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc5a37fdc27e3420b3e6fd2fa6674cc172daaaae">dc5a37fd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip T493 in ghci way.
T493 tests #493, which is an FFI test. FFI tests should be skipped
in ghci way.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3f71d0e9e7d27b93b9fcd0e5b5d4cacc6718d39">e3f71d0e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T16449_2 as broken due to #16742
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5a13a1e40da43d115786bac3a7f8bf0e7849db1">b5a13a1e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T16737 as broken in ghci way due to #16541
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b09374a4a839c2587a738698133465c4b9277c3b">b09374a4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Note intentional typo in T7130
I earlier accidentally corrected it breaking the test.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a798c130b3adc6c336856243a14175d4bd7c770f">a798c130</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">linters/check-makefiles: Limit lint to Makefiles
Previously we would apply this rule, which is only intended for
testsuite Makefiles, to all files. This lead to a number of
false-positives in all.T files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0782141ef52c72523b82cd83b7466a3a65d94a31">0782141e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fetch submodules before running submodule linter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/898f7e9235eff57ececac4836f6ba74388131db2">898f7e92</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix uses of #ifdef/#ifndef
The linter now enforces our preference for `#if defined()` and
`#if !defined()`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a13a04c98c9b11bbd72992354a6f33d3274bb1a">0a13a04c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:20:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump unix submodule
Marks posix002 as fragile in threaded2 way due to #16550.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8579e5b3fadcc7d17e97016b3ea57e78b6a1b78">a8579e5b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:27:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">process: Bump submodule
* Skip process005 in ghci way
* Mark process002 as fragile in threaded2
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f1022c514cf2a89f4b329a898467872315477b2">3f1022c5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:27:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip cgrun078 in ghci way
This test requires FFI usage.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1cbfef47f0288a0f55e8f3db71076afd190121ca">1cbfef47</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:27:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Unbreak galois_raytrace on i386
galois_raytrace was previously broken on i386 due to use of x87
arithmethic on that platform. However,
42504f4a575395a35eec5c3fd7c9ef6e2b54e68e removes x87 support; this
resulted in an unexpected pass. Unmark this test as broken.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20160f1a8a8ed69c168bee5c8d43373191303b3f">20160f1a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T08:27:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't run tests requiring TH in profasm way when GhcDynamic
Since we can't load profiled objects when GhcDynamic==YES. Affects:
* T16737
* T16384
* T16718
* T16619
* T16190
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b751ed89a97545e9ff9c9814a3d5440a8d42d64">7b751ed8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-12T17:52:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump Docker image
Fixes linters.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ffc266e9c5ec8ed6010835165a65bd1f6b56dd4">5ffc266e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T02:48:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a few missing llvm-targets
This should finally fix #14261.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc6b23be509e290f8d27775a1c637284a335ed81">fc6b23be</a></strong>
<div>
<span>by Phuong Trinh</span>
<i>at 2019-06-13T02:48:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16525: ObjectCode freed wrongly because of lack of info header check
`checkUnload` currently doesn't check the info header of static objects.
Thus, it may free an `ObjectCode` struct wrongly even if there's still a
live static object whose info header lies in a mapped section of that
`ObjectCode`. This fixes the issue by adding an appropriate check.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a657543c4d676b7e6e0984b72b31dd95949855e4">a657543c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T02:49:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PrelRules: Ensure that string unpack/append rule fires with source notes
Previously the presence of source notes could hide nested applications
of `unpackFoldrCString#` from our constant folding logic. For instance,
consider the expression:
```haskell
unpackFoldrCString# "foo" c (unpackFoldrCString# "baz" c n)
```
Specifically, ticks appearing in two places can defeat the rule:
a. Surrounding the inner application of `unpackFoldrCString#`
b. Surrounding the fold function, `c`
The latter caused the `str_rules` testcase to fail when `base` was built
with `-g3`.
Fixes #16740.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e98d32a62977fe1057ebbb1b6ed8990438cb9896">e98d32a6</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2019-06-13T02:50:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Track RTS library symlink targets
This requires creating RTS library symlinks when registering, outside
of the rule for the registered library file.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35113117436c4936d97aae90693b93206d9ff213">35113117</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-13T02:50:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Do not allow the Linux jobs to fail anymore
MR !1151 makes the Hadrian/Linux job pass by fixing the last two test failures,
so we can now be stricter and not allow those jobs to fail anymore, easily
letting us see when patches introduce test failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70b5eefe09823f77bcfdd7b4fa8dbaee18ab316c">70b5eefe</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T02:51:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix a few markup issues
Strangely these were only causing the build to fail in the aarch64-linux
job, despite Sphinx throwing errors in all jobs I checked.
Also changes some `#ifdef`s to `#if defined` to satisfy the linter.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9721b40db9b87c0135613649f9f1e129eb49795b">9721b40d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T02:51:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Don't build PDF user's guide on AArch64
For reasons I don't understand sphinx seems to fail to produce a .idx
file for makeindex.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d550b771f6ebb91bfe860fc08811a7d74b39eb38">d550b771</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T02:51:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up .circleci
Move prepare-system.sh to .gitlab and remove everything else.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c53dfb3b2cddfe2d00d9017c9240042cc6bc7fcf">c53dfb3b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T11:52:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: A more portable solution to #9399
Previously we used an awful hybrid batch script/Bourne shell script to
allow this test to run both on Windows and Linux (fixing #9399).
However, this breaks on some libc implementations (e.g. musl). Fix this.
Fixes #16798.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74b5d0496f60b30c3fd4de2e7f8a96d1c481bdd6">74b5d049</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T11:53:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable deb9-llvm job, introduce nightly LLVM job
This should help alleviate queue times as the LLVM job is one of the
longest that we have.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ce63d52fed05371edb34b4f330c33bc85a45127">5ce63d52</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T11:53:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable validate-x86_64-linux-deb9 job to reduce load
Enable artifacts on to ensure we have bindist coverage.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7bc5d6c6578ab9d60a83b81c7cc14819afef32ba">7bc5d6c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-13T23:34:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Maintain separate flags for C++ compiler invocations
Previously we would pass flags intended for the C compiler to the C++
compiler (see #16738). This would cause, for instance, `-std=gnu99` to
be passed to the C++ compiler, causing spurious test failures. Fix this
by maintaining a separate set of flags for C++ compilation invocations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71e75ba6d892e8dfb6794f0ce70d01c9521b77c5">71e75ba6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-13T23:35:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused Unique field from StgFCallOp
Fixes #16696
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ec25fe5986c13f673882a88a3107dfa2e0cec254">ec25fe59</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-13T23:35:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: remove superfluous dependencies in Rules.Compile
Each package's object files were 'need'ing the library files of all transitive
dependencies of the current package, whichi is pointless since the said
libraries are not needed until we link those object files together.
This fixes #16759.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bc6df3223f62a8366e2e4267bac23aa08e6a939">3bc6df32</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-06-13T23:36:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Outputable instances for Float, Double.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/effdd948056923f3bc03688c24d7e0339d6272f5">effdd948</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-06-14T10:48:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement the -XUnliftedNewtypes extension.
GHC Proposal: 0013-unlifted-newtypes.rst
Discussion: https://github.com/ghc-proposals/ghc-proposals/pull/98
Issues: #15219, #1311, #13595, #15883
Implementation Details:
Note [Implementation of UnliftedNewtypes]
Note [Unifying data family kinds]
Note [Compulsory newtype unfolding]
This patch introduces the -XUnliftedNewtypes extension. When this
extension is enabled, GHC drops the restriction that the field in
a newtype must be of kind (TYPE 'LiftedRep). This allows types
like Int# and ByteArray# to be used in a newtype. Additionally,
coerce is made levity-polymorphic so that it can be used with
newtypes over unlifted types.
The bulk of the changes are in TcTyClsDecls.hs. With -XUnliftedNewtypes,
getInitialKind is more liberal, introducing a unification variable to
return the kind (TYPE r0) rather than just returning (TYPE 'LiftedRep).
When kind-checking a data constructor with kcConDecl, we attempt to
unify the kind of a newtype with the kind of its field's type. When
typechecking a data declaration with tcTyClDecl, we again perform a
unification. See the implementation note for more on this.
Co-authored-by: Richard Eisenberg <rae@richarde.dev>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5279dda861f6a5cc804be88dc5f0ff2442660149">5279dda8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-14T10:48:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PrelRules: Don't break let/app invariant in shiftRule
Previously shiftRule would rewrite as invalid shift like
```
let x = I# (uncheckedIShiftL# n 80)
in ...
```
to
```
let x = I# (error "invalid shift")
in ...
```
However, this breaks the let/app invariant as `error` is not
okay-for-speculation. There isn't an easy way to avoid this so let's not
try. Instead we just take advantage of the undefined nature of invalid
shifts and return zero.
Fixes #16742.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/503e830c3d01edc9db4e49e73841e45a20675a1e">503e830c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-14T23:10:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Lint testsuite for framework failures
This introduces a new lint job checking for framework failures and
listing broken tests.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5ea9323a3a39a005a41580228a4722131d417b2">b5ea9323</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-14T23:10:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">lint: Only apply --interactive lint to testsuite .T files
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5c97211cf21d2eb99db1a5cf473a630ffe245064">5c97211c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-14T23:10:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Lint the linters
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/257165b47298644d67d39b6f5b565b65fe840f50">257165b4</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-14T23:10:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove duplicates from 'ghc --info' output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5da6c86f7b1304af3c314b3f9c0b007d6508c427">5da6c86f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-15T15:14:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump unix submodule
Skips `executeFile001` test in `threaded2` way. Fixes #16814.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20b4d5ecabc59062b7a841ce20b631364d8f8645">20b4d5ec</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-15T23:32:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable optimisation when building Cabal lib for stage0
This disables optimisation when building Cabal for Hadrian and
stage0 `ghc-cabal`. Cabal is performance critical in neither case nor
will any performance difference here be visible to the end-user.
See #16817.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/76b7f619385ac5d126dd186ff3bfe4cdad9349e7">76b7f619</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-15T23:32:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable optimisation when building Cabal in development flavours
This updates the make and Hadrian build flavours targetting developers
to disable optimisation when building the Cabal library. Cabal tends to
tickle some very bad compiler performance cases (e.g. #16577) so
disabling optimisation here makes a sizeable impact on overall build
time.
See #16817.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d2a4258c1a025c2610a415e951efe4e2ed8970a">0d2a4258</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-15T23:33:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Introduce concurrent_ways set
Previously we just tested for the threaded2 when determining whether to
skip tests which are fragile under concurrent execution. However, this
isn't the only way which is concurrent.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/beacb6fd898db43382fedf8b9a7e6657e53fca9a">beacb6fd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-15T23:33:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip hDuplicateTo001 in concurrent ways
As noted in #16819, this operation is racy under concurrent execution.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca721193fc71c065036deecfb9d4274fbfc6850d">ca721193</a></strong>
<div>
<span>by Aiken Cairncross</span>
<i>at 2019-06-15T23:33:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in error message
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57b718481d5363ab33df4c7814f74897418f79d7">57b71848</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-15T23:34:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add assertions that way lists are in fact lists
Previously there were a few cases where operations like `omit_ways`
were incorrectly passed a single way (e.g. `omit_ways('threaded2')`).
This won't work as the author expected.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25ee60cdae6ddedaf6b4677c6327c0f31c81073a">25ee60cd</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-06-15T23:35:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Synchronize ClsInst.doTyConApp with TcTypeable validity checks (#15862)
Issue #15862 demonstrated examples of type constructors on which
`TcTypeable.tyConIsTypeable` would return `False`, but the `Typeable`
constraint solver in `ClsInst` (in particular, `doTyConApp`) would
try to generate `Typeable` evidence for anyway, resulting in
disaster. This incongruity was caused by the fact that `doTyConApp`
was using a weaker validity check than `tyConIsTypeable` to determine
if a type constructor warrants `Typeable` evidence or not. The
solution, perhaps unsurprisingly, is to use `tyConIsTypeable` in
`doTyConApp` instead.
To avoid import cycles between `ClsInst` and `TcTypeable`, I factored
out `tyConIsTypeable` into its own module, `TcTypeableValidity`.
Fixes #15862.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4138bf868534f54d47643c0aa38d4dce89135501">4138bf86</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-06-15T23:35:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db313f987f353cd2691b42c85866a62f5c0a903c">db313f98</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T06:26:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base/Event/Poll: Drop POLLRDHUP enum item
Previously the Event enumeration produced by hsc2hs would sometimes
include a currently-unused POLLRDHUP item. This unused binding would
result in a build failure. Drop it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/81608e82dfed7e78c1bba189f26c8c760f7c196a">81608e82</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T06:26:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix T8602 on musl
Musl wants hash-bangs on all executables.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0f683795a72f7b82962d24098b1dc7c2b04ab29">a0f68379</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T06:26:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Ensure T5423 flushes C output buffer
Previously T5423 would fail to flush the printf output buffer.
Consequently it was platform-dependent whether the C or Haskell print
output would be emitted first.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/543dfaab166c81f46ac4af76918ce32190aaab22">543dfaab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T06:26:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Flush conc059's printf buffer
Otherwise it the order out the Haskell and C output will be
system-dependent.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e647752e7b99c2fb198b652bc00c531cf31878cf">e647752e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T06:26:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Ensure that ffi005 output order is predictable
The libc output buffer wasn't being flushed, making the order
system-depedent.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/338336d37eaaac614c6f2c3b077417195b05e713">338336d3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T06:26:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Build alpine release bindists
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75c6ccf72b2e9c363fad6b91dd4a39525f17a4c5">75c6ccf7</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-16T06:27:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix runghc's GHC detection logic to cover the "in-tree Hadrian build" scenario
Before this patch, runghc would only run the GHC detection logic on Windows and
assume that it was invoked through a wrapper script on all other platforms.
This patch lifts this limitation and makes that logic work for the scenario
where someone is calling the runghc executable directly, without passing an
explicit path to GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c35e14058f909bf0c26b5553fc9c61559fc5708">3c35e140</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T19:38:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Really fix #16741
The previous fix, !1095, didn't work as `--show-iface` ignores
`-dsuppress-ticks`. Rework the test instead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3bb1b06b875291cfd7be2a0c0afc87f3c0574e0">b3bb1b06</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T19:38:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Don't allow failure of deb9-dwarf job
This #16741 out of the way this should now pass.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b965de1ef0e2770f71d49d66f88df7fa7cd2cd58">b965de1e</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-16T19:39:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use TupleSections in CmmParse.y, simplify a few exprs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63965ae3a3aa0ea2a2f7462337892898b8880880">63965ae3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-17T01:20:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">make: Clean includes/settings file
Now since this is generated by the build system we should ensure that it
is properly cleaned.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb141114ad4e4eb6db66e212fa08d93257b99bbc">bb141114</a></strong>
<div>
<span>by Siddharth Bhat</span>
<i>at 2019-06-17T01:20:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add link to mfix.github.io/ghc in HACKING.md
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/24afbfe9aacbb3f6a5cec8875ab100f0dfbe1bf8">24afbfe9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-17T10:20:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Run nofib on binary distributions
Updates docker images to ensure that the `time` utility is available.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62f0213d4db6020a0d1feb8512432dcad36f08de">62f0213d</a></strong>
<div>
<span>by Fumiaki Kinoshita</span>
<i>at 2019-06-18T16:00:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Data.Ord: give a field name getDown to Down
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da33f2bb3965bacec25790548d1a9b6812dfeefc">da33f2bb</a></strong>
<div>
<span>by Fumiaki Kinoshita</span>
<i>at 2019-06-18T16:00:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add more newtype-derived instances to Data.Ord.Down
Metric Increase:
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dbf9ca2040c71b2f04322b054322a0ede1e1b700">dbf9ca20</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-18T16:00:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add testcase for #16689
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29ec33cd3ee390e8006a88d34f5ea0ac236663d0">29ec33cd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-18T16:00:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SafeHaskell: Don't throw -Wsafe warning if module is declared Safe
Fixes #16689.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a491e40c5b7b20ef4a579a6697fb47410e0de25a">a491e40c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-18T16:01:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Compile UserSettings with -O0
This guarantees that the interface file for `UserSettings` doesn't
contain any unfoldings, ensuring that a change in it requires minimal
rebuilds.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74bd6b225d94838811b885f9fdf943a5900cb424">74bd6b22</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-18T16:02:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #16832
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a92f59d7385397fb9ee013efe102c797319243c">6a92f59d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-18T16:02:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Run alpine builds during nightly job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4549cadf855d14a6b737ceddf4e474faf8e343ff">4549cadf</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-06-18T16:03:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sure mkSplitUniqSupply stores the precomputed mask only.
mkSplitUniqSupply was lazy on the boxed char.
This caused a bunch of issues:
* The closure captured the boxed Char
* The mask was recomputed on every split of the supply.
* It also caused the allocation of MkSplitSupply to happen in it's own
(allocated) closure. The reason of which I did not further investigate.
We know force the computation of the mask inside mkSplitUniqSupply.
* This way the mask is computed at most once per UniqSupply creation.
* It allows ww to kick in, causing the closure to retain the unboxed
value.
Requesting Uniques in a loop is now faster by about 20%.
I did not check the impact on the overall compiler, but I added a test
to avoid regressions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8584430e1d5f45fec33c783fc3bd6b781fad68de">8584430e</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-19T15:00:11+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a Note name in CmmNode
("Continuation BlockIds" is referenced in CmmProcPoint)
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9d58554f7b19c52896796e8c3b6de20c154a67b2">9d58554f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-19T22:14:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Properly trim IdInfos of DFunIds and PatSyns in TidyPgm
Not doing this right caused #16608. We now properly trim IdInfos of
DFunIds and PatSyns.
Some further refactoring done by SPJ.
Two regression tests T16608_1 and T16608_2 added.
Fixes #16608
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39c758e1426c9e5b00de2207ad53bb4377c1e6a6">39c758e1</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-06-19T22:15:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #1620: ModBreaks.modBreaks_array not initialised
After a :cd command and after setting some package flags,
GHCi unloads all loaded modules by resetting the list of targets.
This patch deletes eventually defined debugger breakpoints, before GHCi resets the target list.
The common code is factored out into the new function clearAllTargets.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c9b57b07fa1d4a5fa69fb77ee8e49f7a0b6ada9">3c9b57b0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-19T22:15:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two places that failed the substitution invariant
The substition invariant relies on keeping the in-scope
set in sync, and we weren't always doing so, which means that
a DEBUG compiler crashes sometimes with an assertion failure
This patch fixes a couple more cases. Still not validate
clean (with -DEEBUG) but closer!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/48fb3482f8cbc8a4b37161021e846105f980eed4">48fb3482</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-19T22:15:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typechecking of partial type signatures
Partial type sigs had grown hair. tcHsParialSigType was
doing lots of unnecessary work, and tcInstSig was cloning it
unnecessarily -- and the result didn't even work: #16728.
This patch cleans it all up, described by TcHsType
Note [Checking parital type signatures]
I basically just deleted code... but very carefully!
Some refactoring along the way
* Distinguish more explicintly between "anonymous" wildcards "_"
and "named" wildcards "_a". I changed the names of a number
of functions to make this distinction much more apparent.
The patch also revealed that the code in `TcExpr`
that implements the special typing rule for `($)` was wrong.
It called `getRuntimeRep` in a situation where where was no
particular reason to suppose that the thing had kind `TYPE r`.
This caused a crash in typecheck/should_run/T10846.
The fix was easy, and actually simplifies the code in `TcExpr`
quite a bit. Hooray.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ae23992786c7ea3211ab6f13e1d61a5edfe5952">3ae23992</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-19T22:15:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments and tiny refactor
* Added Note [Quantified varaibles in partial type signatures]
in TcRnTypes
* Kill dVarSetElemsWellScoped; it was only called in
one function, quantifyTyVars. I inlined it because it
was only scopedSort . dVarSetElems
* Kill Type.tyCoVarsOfBindersWellScoped, never called.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bff2f24ba9104275c665b6a0cf30a8dd18407392">bff2f24b</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-06-19T22:16:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move 'Platform' to ghc-boot
ghc-pkg needs to be aware of platforms so it can figure out which
subdire within the user package db to use. This is admittedly
roundabout, but maybe Cabal could use the same notion of a platform as
GHC to good affect too.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a298b96e624155e1860ff009951cb21be43b99d4">a298b96e</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-06-19T22:16:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add 'stringEncodeArch' and 'stringEncodeOS' to GHC.Platform
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d406a16ac22e6ad02da0d2c75212614eda09d2cb">d406a16a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-06-19T22:16:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-pkg needs settings file to un-hardcode target platform
This matches GHC itself getting the target platform from there.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa4891a729649051f45adcef1fddbda1b0639e94">aa4891a7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-19T22:16:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix a variety of broken links and syntax
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe819dd637842fb564524a7cf80612a3673ce14c">fe819dd6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-19T22:16:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Update -Wsafe description for #16689
We no longer emit a warning when a safe module is explicitly declared as
such.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c311277bf640a4aeb929f3080eaaf656c0e0611c">c311277b</a></strong>
<div>
<span>by Matthías Páll Gissurarson</span>
<i>at 2019-06-21T03:21:21+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add HoleFitPlugins and RawHoleFits
This patch adds a new kind of plugin, Hole fit plugins. These plugins
can change what candidates are considered when looking for valid hole
fits, and add hole fits of their own. The type of a plugin is relatively
simple,
```
type FitPlugin = TypedHole -> [HoleFit] -> TcM [HoleFit]
type CandPlugin = TypedHole -> [HoleFitCandidate] -> TcM [HoleFitCandidate]
data HoleFitPlugin = HoleFitPlugin { candPlugin :: CandPlugin
, fitPlugin :: FitPlugin }
data TypedHole = TyH { tyHRelevantCts :: Cts
-- ^ Any relevant Cts to the hole
, tyHImplics :: [Implication]
-- ^ The nested implications of the hole with the
-- innermost implication first.
, tyHCt :: Maybe Ct
-- ^ The hole constraint itself, if available.
}
This allows users and plugin writers to interact with the candidates and
fits as they wish, even going as far as to allow them to reimplement the
current functionality (since `TypedHole` contains all the relevant
information).
As an example, consider the following plugin:
```
module HolePlugin where
import GhcPlugins
import TcHoleErrors
import Data.List (intersect, stripPrefix)
import RdrName (importSpecModule)
import TcRnTypes
import System.Process
plugin :: Plugin
plugin = defaultPlugin { holeFitPlugin = hfp, pluginRecompile = purePlugin }
hfp :: [CommandLineOption] -> Maybe HoleFitPluginR
hfp opts = Just (fromPureHFPlugin $ HoleFitPlugin (candP opts) (fp opts))
toFilter :: Maybe String -> Maybe String
toFilter = flip (>>=) (stripPrefix "_module_")
replace :: Eq a => a -> a -> [a] -> [a]
replace match repl str = replace' [] str
where
replace' sofar (x:xs) | x == match = replace' (repl:sofar) xs
replace' sofar (x:xs) = replace' (x:sofar) xs
replace' sofar [] = reverse sofar
-- | This candidate plugin filters the candidates by module,
-- using the name of the hole as module to search in
candP :: [CommandLineOption] -> CandPlugin
candP _ hole cands =
do let he = case tyHCt hole of
Just (CHoleCan _ h) -> Just (occNameString $ holeOcc h)
_ -> Nothing
case toFilter he of
Just undscModName -> do let replaced = replace '_' '.' undscModName
let res = filter (greNotInOpts [replaced]) cands
return $ res
_ -> return cands
where greNotInOpts opts (GreHFCand gre) = not $ null $ intersect (inScopeVia gre) opts
greNotInOpts _ _ = True
inScopeVia = map (moduleNameString . importSpecModule) . gre_imp
-- Yes, it's pretty hacky, but it is just an example :)
searchHoogle :: String -> IO [String]
searchHoogle ty = lines <$> (readProcess "hoogle" [(show ty)] [])
fp :: [CommandLineOption] -> FitPlugin
fp ("hoogle":[]) hole hfs =
do dflags <- getDynFlags
let tyString = showSDoc dflags . ppr . ctPred <$> tyHCt hole
res <- case tyString of
Just ty -> liftIO $ searchHoogle ty
_ -> return []
return $ (take 2 $ map (RawHoleFit . text . ("Hoogle says: " ++)) res) ++ hfs
fp _ _ hfs = return hfs
```
with this plugin available, you can compile the following file
```
{-# OPTIONS -fplugin=HolePlugin -fplugin-opt=HolePlugin:hoogle #-}
module Main where
import Prelude hiding (head, last)
import Data.List (head, last)
t :: [Int] -> Int
t = _module_Prelude
g :: [Int] -> Int
g = _module_Data_List
main :: IO ()
main = print $ t [1,2,3]
```
and get the following output:
```
Main.hs:14:5: error:
• Found hole: _module_Prelude :: [Int] -> Int
Or perhaps ‘_module_Prelude’ is mis-spelled, or not in scope
• In the expression: _module_Prelude
In an equation for ‘t’: t = _module_Prelude
• Relevant bindings include
t :: [Int] -> Int (bound at Main.hs:14:1)
Valid hole fits include
Hoogle says: GHC.List length :: [a] -> Int
Hoogle says: GHC.OldList length :: [a] -> Int
t :: [Int] -> Int (bound at Main.hs:14:1)
g :: [Int] -> Int (bound at Main.hs:17:1)
length :: forall (t :: * -> *) a. Foldable t => t a -> Int
with length @[] @Int
(imported from ‘Prelude’ at Main.hs:5:1-34
(and originally defined in ‘Data.Foldable’))
maximum :: forall (t :: * -> *) a. (Foldable t, Ord a) => t a -> a
with maximum @[] @Int
(imported from ‘Prelude’ at Main.hs:5:1-34
(and originally defined in ‘Data.Foldable’))
(Some hole fits suppressed; use -fmax-valid-hole-fits=N or -fno-max-valid-hole-fits)
|
14 | t = _module_Prelude
| ^^^^^^^^^^^^^^^
Main.hs:17:5: error:
• Found hole: _module_Data_List :: [Int] -> Int
Or perhaps ‘_module_Data_List’ is mis-spelled, or not in scope
• In the expression: _module_Data_List
In an equation for ‘g’: g = _module_Data_List
• Relevant bindings include
g :: [Int] -> Int (bound at Main.hs:17:1)
Valid hole fits include
Hoogle says: GHC.List length :: [a] -> Int
Hoogle says: GHC.OldList length :: [a] -> Int
g :: [Int] -> Int (bound at Main.hs:17:1)
head :: forall a. [a] -> a
with head @Int
(imported from ‘Data.List’ at Main.hs:7:19-22
(and originally defined in ‘GHC.List’))
last :: forall a. [a] -> a
with last @Int
(imported from ‘Data.List’ at Main.hs:7:25-28
(and originally defined in ‘GHC.List’))
|
17 | g = _module_Data_List
```
This relatively simple plugin has two functions, as an example of what
is possible to do with hole fit plugins. The candidate plugin starts by
filtering the candidates considered by module, indicated by the name of
the hole (`_module_Data_List`). The second function is in the fit
plugin, where the plugin invokes a local hoogle instance to search by
the type of the hole.
By adding the `RawHoleFit` type, we can also allow these completely free
suggestions, used in the plugin above to display fits found by Hoogle.
Additionally, the `HoleFitPluginR` wrapper can be used for plugins to
maintain state between invocations, which can be used to speed up
invocation of plugins that have expensive initialization.
```
-- | HoleFitPluginR adds a TcRef to hole fit plugins so that plugins can
-- track internal state. Note the existential quantification, ensuring that
-- the state cannot be modified from outside the plugin.
data HoleFitPluginR = forall s. HoleFitPluginR
{ hfPluginInit :: TcM (TcRef s)
-- ^ Initializes the TcRef to be passed to the plugin
, hfPluginRun :: TcRef s -> HoleFitPlugin
-- ^ The function defining the plugin itself
, hfPluginStop :: TcRef s -> TcM ()
-- ^ Cleanup of state, guaranteed to be called even on error
}
```
Of course, the syntax here is up for debate, but hole fit plugins allow
us to experiment relatively easily with ways to interact with
typed-holes without having to dig deep into GHC.
Reviewers: bgamari
Subscribers: rwbarton, carter
Differential Revision: https://phabricator.haskell.org/D5373
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2485c08aeecd9664bca7812e69e59b85ce16c079">2485c08a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-21T13:32:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip dynamicToo006 when dynamic linking is not available
This was previously failling on Windows.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa5164313aa86941bf15722936824dfbf556a911">aa516431</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-21T13:32:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T3372 as fragile on Windows
On Windows we must lock package databases even when opening for
read-only access. This means that concurrent GHC sessions are very
likely to fail with file lock contention.
See #16773.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2eedb120a6fae214ca5b55658939a359bc55d19a">2eedb120</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-21T13:32:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add stderr output for UnsafeInfered02 on Windows
This test uses TemplateHaskell causing GHC to build dynamic objects on
platforms where dynamic linking is available. However, Windows doesn't support
dynamic linking. Consequently the test would fail on Windows with:
```patch
--- safeHaskell/safeInfered/UnsafeInfered02.run/UnsafeInfered02.stderr.normalised 2019-06-04 15:10:10.521594200 +0000
+++ safeHaskell/safeInfered/UnsafeInfered02.run/UnsafeInfered02.comp.stderr.normalised 2019-06-04 15:10:10.523546200 +0000
@@ -1,5 +1,5 @@
-[1 of 2] Compiling UnsafeInfered02_A ( UnsafeInfered02_A.hs, UnsafeInfered02_A.o, UnsafeInfered02_A.dyn_o )
-[2 of 2] Compiling UnsafeInfered02 ( UnsafeInfered02.hs, UnsafeInfered02.o, UnsafeInfered02.dyn_o )
+[1 of 2] Compiling UnsafeInfered02_A ( UnsafeInfered02_A.hs, UnsafeInfered02_A.o )
+[2 of 2] Compiling UnsafeInfered02 ( UnsafeInfered02.hs, UnsafeInfered02.o )
UnsafeInfered02.hs:4:1:
UnsafeInfered02_A: Can't be safely imported!
```
The other approach I considered for this issue is to pass `-v0` to GHC.
However, I felt we should probably do this consistently for all of the tests in
this directory and this would take more time than I currently have.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3967d13a2037d65d4f00fc43076b53339b475876">3967d13a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-21T13:32:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark OldModLocation as broken on Windows
Strangely the path it emits contains duplicate path delimiters (#16772),
```patch
--- ghc-api/downsweep/OldModLocation.run/OldModLocation.stderr.normalised 2019-06-04 14:40:26.326075000 +0000
+++ ghc-api/downsweep/OldModLocation.run/OldModLocation.run.stderr.normalised 2019-06-04 14:40:26.328029200 +0000
@@ -1 +1 @@
-[Just "A.hs",Just "mydir/B.hs"]
+[Just "A.hs",Just "mydir//B.hs"]
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31f2ea6899041974c601ca368b9c2af5e8de125b">31f2ea68</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-21T13:32:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T7170 as broken on Windows
Due to #16801.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7bd1c3e15f83c04447bc2ec41bbc36c9c1b7fe0d">7bd1c3e1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-21T13:32:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T7702 as broken on Windows
Due to #16799.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84900724d59f092a6eebe2834c1c5a62186e430e">84900724</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-21T13:32:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T15633a and T15633b as fragile on Windows
As noted in #16813, these tests seem to be fragile on Windows.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49fff41d0385ac1ad80a1a8b2ae33e765e89a088">49fff41d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-21T13:32:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">linker: Disable code unloading
As noted in #16841, there are currently a variety of bugs in the
unloading logic. These only affect Windows since code unloading is
disabled on Linux, where we build with `GhcDynamic=YES` by default.
In the interest of getting the tree green on Windows disable code
unloading until the issues are resolved.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0595d22ce5bc19699079abdb47377b5707cdbbc">e0595d22</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-22T09:36:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T16608_* as fragile on Darwin
As noted in #16855.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/655c6e265e06acbebcb6f9aa084efb3ce933e189">655c6e26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-22T10:06:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghci: Don't rely on resolution of System.IO to base module
Previously we would hackily evaluate a textual code snippet to compute
actions to disable I/O buffering and flush the stdout/stderr handles.
This broke in a number of ways (#15336, #16563).
Instead we now ship a module (`GHC.GHCi.Helpers`) with `base` containing
the needed actions. We can then easily refer to these via `Orig` names.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f8fc31b84919ea40da87eb4607bb2a52b960efe">8f8fc31b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-22T10:06:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #16563
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22e721c10e3790dac6113cdcb33c62c07db54cb0">22e721c1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-22T10:06:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T5611 as broken in ghci way
As described in #16845.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0d6bf2a34d5e2e0cfb2410f58e768935d527be0">b0d6bf2a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-22T10:06:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Reset STATIC_LINK field of reverted CAFs
When we revert a CAF we must reset the STATIC_LINK field lest the GC
might ignore the CAF (e.g. as it carries the STATIC_FLAG_LIST flag) and
will consequently overlook references to object code that we are trying
to unload. This would result in the reachable object code being
unloaded. See Note [CAF lists] and Note [STATIC_LINK fields].
This fixes #16842.
Idea-due-to: Phuong Trinh <lolotp@fb.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f2fff89afebb065b27eba0f6e1f89e25c1c158d">1f2fff89</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-22T10:06:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add caf_crash testcase
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ade3db5392d0f98cbd2e917fca926f4e08ca4fa7">ade3db53</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-23T17:19:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Test for #13786
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a502cd1431b535a12dced0479b75c5f7dbfb01c">5a502cd1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-23T17:19:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghci: Load static objects in batches
Previously in the case where GHC was dynamically linked we would load
static objects one-by-one by linking each into its own shared object and
dlopen'ing each in order. However, this meant that the link would fail
in the event that the objects had cyclic symbol dependencies.
Here we fix this by merging each "run" of static objects into a single
shared object and loading this.
Fixes #13786 for the case where GHC is dynamically linked.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40">9bbcc3be</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-06-23T17:20:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnliftedNewtypes-relation kind signature validity checks
This fixes three infelicities related to the programs that are
(and aren't) accepted with `UnliftedNewtypes`:
* Enabling `UnliftedNewtypes` would permit newtypes to have return
kind `Id Type`, which had disastrous results (i.e., GHC panics).
* Data family declarations ending in kind `TYPE r` (for some `r`)
weren't being accepted if `UnliftedNewtypes` wasn't enabled,
despite the GHC proposal specifying otherwise.
* GHC wasn't warning about programs that _would_ typecheck if
`UnliftedNewtypes` were enabled in certain common cases.
As part of fixing these issues, I factored out the logic for checking
all of the various properties about data type/data family return
kinds into a single `checkDataKindSig` function. I also cleaned up
some of the formatting in the existing error message that gets
thrown.
Fixes #16821, fixes #16827, and fixes #16829.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71aca77c780dad8496054a06a7fe65704a13a742">71aca77c</a></strong>
<div>
<span>by Erik de Castro Lopo</span>
<i>at 2019-06-24T01:11:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fixes for LLVM 7
LLVM version numberinf changed recently. Previously, releases were numbered
4.0, 5.0 and 6.0 but with version 7, they dropped the redundant ".0".
Fix requires for Llvm detection and some code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/581cbc28e143a4ed8e7f794ed1618161222a5646">581cbc28</a></strong>
<div>
<span>by Erik de Castro Lopo</span>
<i>at 2019-06-24T01:12:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add MonadFail instance for ParserM
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15b262237ab055f4afbf79588f76631a194a332f">15b26223</a></strong>
<div>
<span>by Andrey Mokhov</span>
<i>at 2019-06-25T01:36:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix cyclic dependencies when using --configure
This resolves #16809 (https://gitlab.haskell.org/ghc/ghc/issues/16809).
This patch removes the unnecessary dependency on configure-generated
flags `windowsHost`, `osxHost` and `iosHost`, using the information
provided by the module `System.Info` instead.
We also take care to use the `CrossCompiling` flag generated by the
configure script only after the latter had a chance to run.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebd63e8de30470ccf8b65c11f0fc82705960b5cf">ebd63e8d</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-25T01:36:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify link_caf and mkForeignLabel functions
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c346585b5f5054a85e48dc546e198c5be124340f">c346585b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T08:37:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: A major revamp of the driver
This tries to put the testsuite driver into a slightly more maintainable
condition:
* Add type annotations where easily done
* Use pathlib.Path instead of str paths
* Make it pass the mypy typechecker
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb40bd37ebf4fee0c2c06f9e8545f3b34c7fa4a5">bb40bd37</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T08:37:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix a few issues in JUnit output
* Make it pass mypy
* Fix a typo in test name field
* Report more stderr output
* Report stdout output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95f56853d6288076551a5326ad7b4778742a51ce">95f56853</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T08:37:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add testsuite typechecking lint
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9542ab06e3d52633c0d06c40f54e8e9a125caa51">9542ab06</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T08:38:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't run T16525a with -DS unless compiler_debugged
Originally I was thinking of just skipping the test unless
compiled_debugged==True. However, the test will likely be useful even
without -DS, so let's run it either way.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0993a295caf7b5a93d9819ff45e8ed32c3e8ea1">d0993a29</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T08:38:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix expected output for caf_crash
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/757b71d90ef27150f474eec1f67dc8fb91c47975">757b71d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T08:38:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark ghci058 as broken on Windows
Due to #16858.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/38ded74349fa7896ff321c1e43c6a028206bb0d0">38ded743</a></strong>
<div>
<span>by Siddharth Bhat</span>
<i>at 2019-06-25T15:15:16+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] Typo fix: b*ar*nches -> b*ra*nches
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a03d5a178cd63c01b8dedd6c58f302a1635ff61">8a03d5a1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T22:20:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #16846
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ff0a171aa199f34054092e728b56ddf6d58a093">5ff0a171</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T22:20:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CoreToStg: Enable CAFfyness checking with -dstg-lint
The debugging involved in finding #16846 wouldn't have been necessary
had the consistentCafInfo check been enabled. However, :wq
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cac8dc9f51e31e4c0a6cd9bc302f7e1bc7c03beb">cac8dc9f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T22:20:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't eta-expand unsaturated primops
Previously, as described in Note [Primop wrappers], `hasNoBinding` would
return False in the case of `PrimOpId`s. This would result in eta
expansion of unsaturated primop applications during CorePrep. Not only
did this expansion result in unnecessary allocations, but it also meant
lead to rather nasty inconsistencies between the CAFfy-ness
determinations made by TidyPgm and CorePrep.
This fixes #16846.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b90437d8b5c2727450cf45b12fd65cc87a8ab80e">b90437d8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T22:20:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Unbreak T16608 tests
Sleep to avoid non-determinism due to Darwin's poor mtime resolution.
Fixes #16855.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ff2b99e19fc4245c171edd399f0e18301e0ba535">ff2b99e1</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-25T22:21:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused UniqSupply functions
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c2127c4837d7e2588399c06b56b45b2d4c2f9b0">4c2127c4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T22:52:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump containers submodule to v0.6.2.1
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5c3f20801c4149d6a950cfb36c7a841dd32d17e0">5c3f2080</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-25T22:52:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal submodule to what will become 3.0.0.0
Metric Increase:
haddock.Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a863c44f35720b760054e949de1b2f431f32774e">a863c44f</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2019-06-25T23:25:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -Winferred-safe-imports warning
This commit partly reverts e69619e923e84ae61a6bb4357f06862264daa94b
commit by reintroducing Sf_SafeInferred SafeHaskellMode.
We preserve whether module was declared or inferred Safe. When
declared-Safe module imports inferred-Safe, we warn. This inferred
status is volatile, often enough it's a happy coincidence, something
which cannot be relied upon. However, explicitly Safe or Trustworthy
packages won't accidentally become Unsafe.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ec5ceb009299fbb3c5ff1fef39180f5a8fbb774">8ec5ceb0</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2019-06-25T23:25:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -Wmissing-safe-haskell-mode warning
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c99d9aab415ad4aef9abdd8dc70a9063c0f6270c">c99d9aab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-26T08:15:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix T16832
The test seems to have been missing the name of its script and didn't
build with HEAD. How it made it through CI is beyond me.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0899925b065813821f1bab43e2b0c4cc434633a">e0899925</a></strong>
<div>
<span>by Siddharth Bhat</span>
<i>at 2019-06-26T08:16:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] add a blurb about the purpose of Printer.c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58e84b308c4351793defd1b6b06339261d5abdf4">58e84b30</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-26T08:18:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Use safe FFI call in T5611
The original issue, #5611, was concerned with safe calls. However, the
test inexplicably used an unsafe call. Fix this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/12752342228fc60d87c4235c253655a9092388a3">12752342</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-26T08:18:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add T5611a
This is the same as T5611 but with an unsafe call to sleep.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/551b79e4c2685f0c6de16e274efd686f26ca3876">551b79e4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-26T08:18:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T5611 and T5611a as fragile
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44d08c32f5038bd395bf24df3f5c9f0297a3d0f0">44d08c32</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-26T08:20:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Run and report on fragile tests
This allows us to run (but ignore the result of) fragile testcases.
Hopefully this should allow us to more easily spot when a fragile test
becomes un-fragile.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c4f18d071dcd76d068ae06d43d7c5048b57d980">1c4f18d0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-26T08:20:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: More type signatures
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a586b33f8e8ad60b5c5ef3501c89e9b71794bbed">a586b33f</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-06-27T10:42:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Correct handling of LARGE ARR_WORDS in LDV profiler
This implements the correct fix for #11627 by skipping over the slop
(which is zeroed) rather than adding special case logic for LARGE
ARR_WORDS which runs the risk of not performing a correct census by
ignoring any subsequent blocks.
This approach implements similar logic to that in Sanity.c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed4cbd932651bb2a2673e62aad4e5cc6492c6735">ed4cbd93</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-06-27T10:42:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Correct assertion in LDV_recordDead
It is possible that void_total is exactly equal to not_used and the
other assertions for this check for <= rather than <.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/07cffc49d031df71702be3bf9006e0ad006414e2">07cffc49</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-06-27T10:42:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Do not traverse nursery for dead closures in LDV profile
It is important that `heapCensus` and `LdvCensusForDead` traverse the
same areas.
`heapCensus` increases the `not_used` counter which tracks how many
closures are live but haven't been used yet.
`LdvCensusForDead` increases the `void_total` counter which tracks how
many dead closures there are.
The `LAG` is then calculated by substracting the `void_total` from
`not_used` and so it is essential that `not_used >= void_total`. This
fact is checked by quite a few assertions.
However, if a program has low maximum residency but allocates a lot in
the nursery then these assertions were failing (see #16753 and #15903)
because `LdvCensusForDead` was observing dead closures from the nursery
which totalled more than the `not_used`. The same closures were not
counted by `heapCensus`.
Therefore, it seems that the correct fix is to make `LdvCensusForDead`
agree with `heapCensus` and not traverse the nursery for dead closures.
Fixes #16100 #16753 #15903 #8982
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1f67887e3d85e6bfd09744fbea976e1f3e16c02">c1f67887</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-06-27T10:43:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve doc for :type-at. (#14780)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/52f102166c9677fbc58ac86203eab388913fbdf0">52f10216</a></strong>
<div>
<span>by Roland Zumkeller</span>
<i>at 2019-06-27T10:43:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: prefer cc over gcc
Fixes #16857.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90e0ab7d80d88463df97bc3514fc89d2ab9fcfca">90e0ab7d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-06-27T10:44:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Happy deps for Stack (#16825)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d35cec7a9c07a0fc3b40e45d64e5794c3567a523">d35cec7a</a></strong>
<div>
<span>by Fraser Tweedale</span>
<i>at 2019-06-27T10:45:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">getExecutablePath: get path from sysctl on FreeBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a68b8b7974365db4ad71ea239bdc7e9a8c5896e">2a68b8b7</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-06-27T10:45:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16805 by formatting warning message
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/217258d0dfef5f0d9844055e5c62077f3a4eb340">217258d0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-27T10:46:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add more type annotations to perf_notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4ec233ecfc7f061c19d0c5ef98ad05719b1161e7">4ec233ec</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-06-27T23:58:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GCC warnings with __clear_cache builtin (#16867)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef6d9a50db115e296d2d9bec3e94c7369f1d504c">ef6d9a50</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2019-06-27T23:59:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">typo in the docs for DynFlags.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11bac11545b19a63f5cec3c5bbd5c3f9a7dae0b2">11bac115</a></strong>
<div>
<span>by Travis Whitaker</span>
<i>at 2019-06-28T15:25:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correct closure observation, construction, and mutation on weak memory machines.
Here the following changes are introduced:
- A read barrier machine op is added to Cmm.
- The order in which a closure's fields are read and written is changed.
- Memory barriers are added to RTS code to ensure correctness on
out-or-order machines with weak memory ordering.
Cmm has a new CallishMachOp called MO_ReadBarrier. On weak memory machines, this
is lowered to an instruction that ensures memory reads that occur after said
instruction in program order are not performed before reads coming before said
instruction in program order. On machines with strong memory ordering properties
(e.g. X86, SPARC in TSO mode) no such instruction is necessary, so
MO_ReadBarrier is simply erased. However, such an instruction is necessary on
weakly ordered machines, e.g. ARM and PowerPC.
Weam memory ordering has consequences for how closures are observed and mutated.
For example, consider a closure that needs to be updated to an indirection. In
order for the indirection to be safe for concurrent observers to enter, said
observers must read the indirection's info table before they read the
indirectee. Furthermore, the entering observer makes assumptions about the
closure based on its info table contents, e.g. an INFO_TYPE of IND imples the
closure has an indirectee pointer that is safe to follow.
When a closure is updated with an indirection, both its info table and its
indirectee must be written. With weak memory ordering, these two writes can be
arbitrarily reordered, and perhaps even interleaved with other threads' reads
and writes (in the absence of memory barrier instructions). Consider this
example of a bad reordering:
- An updater writes to a closure's info table (INFO_TYPE is now IND).
- A concurrent observer branches upon reading the closure's INFO_TYPE as IND.
- A concurrent observer reads the closure's indirectee and enters it. (!!!)
- An updater writes the closure's indirectee.
Here the update to the indirectee comes too late and the concurrent observer has
jumped off into the abyss. Speculative execution can also cause us issues,
consider:
- An observer is about to case on a value in closure's info table.
- The observer speculatively reads one or more of closure's fields.
- An updater writes to closure's info table.
- The observer takes a branch based on the new info table value, but with the
old closure fields!
- The updater writes to the closure's other fields, but its too late.
Because of these effects, reads and writes to a closure's info table must be
ordered carefully with respect to reads and writes to the closure's other
fields, and memory barriers must be placed to ensure that reads and writes occur
in program order. Specifically, updates to a closure must follow the following
pattern:
- Update the closure's (non-info table) fields.
- Write barrier.
- Update the closure's info table.
Observing a closure's fields must follow the following pattern:
- Read the closure's info pointer.
- Read barrier.
- Read the closure's (non-info table) fields.
This patch updates RTS code to obey this pattern. This should fix long-standing
SMP bugs on ARM (specifically newer aarch64 microarchitectures supporting
out-of-order execution) and PowerPC. This fixes issue #15449.
Co-Authored-By: Ben Gamari <ben@well-typed.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd660edeb783a74e5ca3f1f82713b2aeedae19dc">bd660ede</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-28T15:25:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Assert that LDV profiling isn't used with parallel GC
I'm not entirely sure we are careful about ensuring this; this is a
last-ditch check.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/826939387be69b100461dd553937dfea729b15ef">82693938</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2019-07-02T16:18:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add _GLOBAL_OFFSET_TABLE_ support
This adds lookup logic for _GLOBAL_OFFSET_TABLE_ as well as
relocation logic for R_ARM_BASE_PREL and R_ARM_GOT_BREL which
the gnu toolchain (gas, gcc, ...) prefers to produce. Apparently
recent llvm toolchains will produce those as well.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/348e3f8eea84bdbfa2f3a8adc772c4b67c27f756">348e3f8e</a></strong>
<div>
<span>by Edward Amsden</span>
<i>at 2019-07-02T16:18:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Lookup _GLOBAL_OFFSET_TABLE by symbol->addr when doing relocations
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9abcad4cc3f9f393e7368c082d693ec6dfc60f5">e9abcad4</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2019-07-02T16:18:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">No atomics on arm32; this will just yield stubs.
As such the internal linker will fail for them. The alternative
would be to implement them as stubs in the linker and have them
barf when called.
> Not all operations are supported by all target processors. If a
particular operation cannot be implemented on the target processor,
a warning is generated and a call an external function is
generated. The external function carries the same name as the
built-in version, with an additional suffix ‘_n’ where n is the size
of the data type.
(https://gcc.gnu.org/onlinedocs/gcc/_005f_005fsync-Builtins.html)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/023a2bc7a14792f744397e9502637478fefa15fb">023a2bc7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-02T16:18:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to rts/linker/elf_got.c</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bed9647c5e6edbfcfed2d7dbd8d25fd8fd2b195">0bed9647</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-02T16:18:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to rts/linker/Elf.c</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cef80c0b9edca3d21b5c762f51dfbab4c5857d8a">cef80c0b</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-07-02T16:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #15843 by extending Template Haskell AST for tuples to support sections
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/294b55dcff51fb9e419889d7262c7f053c919623">294b55dc</a></strong>
<div>
<span>by Eric Wolf</span>
<i>at 2019-07-02T16:19:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #16575
just use the test to show the defective behaviour, so we can see
the difference, when it gets fixed
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/60b9eab9ffa7560334ef886ae1a0461d55a95f9a">60b9eab9</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-07-02T16:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix stage 1 warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df3e5b744db29c085f5bc05f8b609197bcbf9b0c">df3e5b74</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2019-07-02T16:20:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: disable cloud build cache for symlinks #16800
This is a temporary workaround shake not supporting symlinks
when using cloud/cached builds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acd795583625401c5554f8e04ec7efca18814011">acd79558</a></strong>
<div>
<span>by Abhiroop Sarkar</span>
<i>at 2019-07-03T09:33:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add support for SIMD operations in the NCG
This adds support for constructing vector types from Float#, Double# etc
and performing arithmetic operations on them
Cleaned-Up-By: Ben Gamari <ben@well-typed.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/973c61b526d2172d73a6e59977b9f40b5d76650f">973c61b5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-03T09:34:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix doc-tarball job
Previously we used the deb9-debug job which used the `validate` build
flavour which disabled `BUILD_SPHINX_PDF`. Fix this.
Fixes #16890.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a25f6f55eaca0d3ec36afb574d5fa9326ea09d55">a25f6f55</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-07-03T09:34:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump template-haskell version to 2.16.0.0
Commit cef80c0b9edca3d21b5c762f51dfbab4c5857d8a debuted a breaking
change to `template-haskell`, so in order to guard against it
properly with CPP, we need to bump the `template-haskell` version
number accordingly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7a2e709e83078164ef061239f9efc643a36d1b0">f7a2e709</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-04T15:29:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump parsec submodule to 3.1.14.0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7f7e1ed6eb03045ee9b5a185666ea206a76bbb6">d7f7e1ed</a></strong>
<div>
<span>by Siddharth Bhat</span>
<i>at 2019-07-04T21:22:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make printer untag when chasing a pointer in a RET_FUN frame
This is to mimic what `Scav.c` does. This should fix a crash in
the printer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/675d27fc241cafbdf666f421e9c2aa2c2625bc40">675d27fc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-04T21:22:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab: Reduce size of template headings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/679427f878e50ba5a9981bac4c2f9c76f4de3c3c">679427f8</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-07-04T21:23:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Produce all DerivInfo in tcTyAndClassDecls
Before this refactoring:
* DerivInfo for data family instances was returned from tcTyAndClassDecls
* DerivInfo for data declarations was generated with mkDerivInfos and added at a
later stage of the pipeline in tcInstDeclsDeriv
After this refactoring:
* DerivInfo for both data family instances and data declarations is returned from
tcTyAndClassDecls in a single list.
This uniform treatment results in a more convenient arrangement to fix #16731.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53aa59f36dc6554c37ead9677c71e91cad3f9f21">53aa59f3</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-07-04T21:23:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a missing zonk (fixes #16902)
In the eager unifier, when unifying (tv1 ~ tv2),
when we decide to swap them over, to unify (tv2 ~ tv1),
I'd forgotten to ensure that tv1's kind was fully zonked,
which is an invariant of uUnfilledTyVar2.
That could lead us to build an infinite kind, or (in the
case of #16902) update the same unification variable twice.
Yikes.
Now we get an error message rather than non-termination,
which is much better. The error message is not great,
but it's a very strange program, and I can't see an easy way
to improve it, so for now I'm just committing this fix.
Here's the decl
data F (a :: k) :: (a ~~ k) => Type where
MkF :: F a
and the rather error message of which I am not proud
T16902.hs:11:10: error:
• Expected a type, but found something with kind ‘a1’
• In the type ‘F a’
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed6629013b91f782953b4aa5db2854647e3eae97">ed662901</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-07-04T21:24:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix -hT option with profiling rts
In dumpCensus we switch/case on doHeapProfile twice. The second switch
tries to barf on unknown doHeapProfile modes but HEAP_BY_CLOSURE_TYPE is
checked by the first switch and not included in the second.
So when trying to pass -hT to the profiling rts it barfs.
This commit simply merges the two switches into one which fixes this
problem.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/80afdf6be11ae3b5bfd1b09dbc5f5118a9dde55a">80afdf6b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-07-04T21:25:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix over-eager implication constraint discard
Ticket #16247 showed that we were discarding an implication
constraint that had empty ic_wanted, when we still needed to
keep it so we could check whether it had a bad telescope.
Happily it's a one line fix. All the rest is comments!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f002250abac21ee4e9c9e4d7bc05db8aa885a65d">f002250a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-07-04T21:25:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Dont gather ticks when only striping them in STG.
Adds stripStgTicksTopE which only returns the stripped expression.
So far we also allocated a list for the stripped ticks which was
never used.
Allocation difference is as expected very small but present.
About 0.02% difference when compiling with -O.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a76b233d5a598b12f1921405cdcb27b0ea1b809d">a76b233d</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2019-07-05T07:06:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make all submodules have absolute URLs
The relative URLs were a workaround to let most contributors fork from
Github due to a weakness in the haskell.org server.
This workaround is no longer needed. And relative submodule URLs are
an impediment to forking which makes contributions harder than they
should be.
The URLs are chosen to clone from https, because this makes sure that
anybody, even not a registered Gitlab user, can clone a fork
recursively.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62b82135a50b15869c425ef5e7dc35700e846228">62b82135</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-07-05T07:07:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More sensible SrcSpans for recursive pattern synonym errors (#16900)
Attach the `SrcSpan` of the first pattern synonym binding involved in
the recursive group when throwing the corresponding error message,
similarly to how it is done for type synonyms.
Fixes #16900.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2fd1ed541ae55a30ef65e18dc09bba993f37c70e">2fd1ed54</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-07-05T07:08:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16895 by checking whether infix expression operator is a variable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/03f5adcd62fb1c6676f8b9e77723bac514ac8e9d">03f5adcd</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2019-07-08T07:07:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Shake and copy instead of hard link from cloud cache
This is important as in hard link mode shake makes all such files
read only to avoid accidentally modifying cache files via the
hard link. It turns out, many Hadrian rules attempt read access
to such files and hence fail in the hard link mode. These
rules could be refactored to avoid write access, but using
copy instead of hard link a much simpler solution.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5af815f2e43e9f1b5ca9ec0803f9fccabb49e2fe">5af815f2</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-07-08T07:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for old issue w/ bad source locations for warnings in .lhs files (#515)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a03d77b9a9915e4b37fe1ea6688c135e7b00654">6a03d77b</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-07-09T11:52:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use an empty data type in TTG extension constructors (#15247)
To avoid having to `panic` any time a TTG extension constructor is
consumed, this MR introduces an uninhabited 'NoExtCon' type and uses
that in every extension constructor's type family instance where it
is appropriate. This also introduces a 'noExtCon' function which
eliminates a 'NoExtCon', much like 'Data.Void.absurd' eliminates
a 'Void'.
I also renamed the existing `NoExt` type to `NoExtField` to better
distinguish it from `NoExtCon`. Unsurprisingly, there is a lot of
code churn resulting from this.
Bumps the Haddock submodule. Fixes #15247.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b05c8423bd97547e7961d947df27b34f52f2ce47">b05c8423</a></strong>
<div>
<span>by Phuong Trinh</span>
<i>at 2019-07-09T22:55:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16511: changes in interface dependencies should trigger recompilation
If the union of dependencies of imported modules change, the `mi_deps`
field of the interface files should change as well. Because of that, we
need to check for changes in this in recompilation checker which we are
not doing right now. This adds a checks for that.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb43bddc771094632bd08a4eab28fd3e714affd0">fb43bddc</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-09T22:56:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two more `#ifndef` for the linter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0472f0f6a92395d478e9644c0dbd12948518099f">0472f0f6</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-09T22:56:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove most uses of TARGET platform macros
These prevent multi-target builds. They were gotten rid of in 3 ways:
1. In the compiler itself, replacing `#if` with runtime `if`. In these
cases, we care about the target platform still, but the target platform
is dynamic so we must delay the elimination to run time.
2. In the compiler itself, replacing `TARGET` with `HOST`. There was
just one bit of this, in some code splitting strings representing lists
of paths. These paths are used by GHC itself, and not by the compiled
binary. (They are compiler lookup paths, rather than RPATHS or something
that does matter to the compiled binary, and thus would legitamentally
be target-sensative.) As such, the path-splitting method only depends on
where GHC runs and not where code it produces runs. This should have
been `HOST` all along.
3. Changing the RTS. The RTS doesn't care about the target platform,
full stop.
4. `includes/stg/HaskellMachRegs.h` This file is also included in the
genapply executable. This is tricky because the RTS's host platform
really is that utility's target platform. so that utility really really
isn't multi-target either. But at least it isn't an installed part of
GHC, but just a one-off tool when building the RTS. Lying with the
`HOST` to a one-off program (genapply) that isn't installed doesn't seem so bad.
It's certainly better than the other way around of lying to the RTS
though not to genapply. The RTS is more important, and it is installed,
*and* this header is installed as part of the RTS.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/24782b89907ab36fb5aef3a17584f4c10f1e2690">24782b89</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-09T22:56:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deduplicate "unique subdir" code between GHC and Cabal
The code, including the generated module with the version, is now in
ghc-boot. Config.hs reexports stuff as needed, ghc-pkg doesn't need any
tricks at all.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42ff8653bd5ce7f00af5783f2973393ebfcd7cc7">42ff8653</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-09T22:56:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix #16818
Renames performance metrics to include whether they are compile-time or
runtime metrics.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18ac9ad404f490bd7ea0639a1b85a88ed4502613">18ac9ad4</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-07-09T22:57:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: implement key-value settings for builder options
They take the general form `foo.bar.baz [+]= some values`, where
`=` completely overrides the arguments for a builder and `+=` extends
them. We currenly only support settings for updating the GHC and C
compiler options, of the form:
```
{stage0, ..., stage3 or *}.{package name or *}
.ghc.{c, hs, link, deps, toolargs or *}.opts
{stage0, ..., stage3 or *}.{package name or *}
.cc.{c, deps or *}.opts
```
The supported settings and their use is covered in the new section
of `hadrian/doc/user-settings.md`, while the implementation is explained
in a new Note [Hadrian settings].
Most of the logic is implemented in a new module, `Settings.Parser`, which
contains key-value assignment/extension parsers as well as utilities for
specifying allowed settings at a high-level, generating a `Predicate` from
such a description or generating the list of possible completions for a given
string.
The additions to the `Settings` module make use of this to describe the
settings that Hadrian currently supports, and apply all such
key-value settings (from the command line and `<root>/hadrian.settings`)
to the flavour that Hadrian is going to proceed with.
This new setting system comes with support for generating Bash completions,
implemented in `hadrian/completion.sh` and Hadrian's `autocomplete` target:
> source hadrian/completion.sh
> hadrian/build.sh stage1.base.ghc.<TAB>
stage1.base.ghc.c.opts stage1.base.ghc.hs.opts
stage1.base.ghc.*.opts stage1.base.ghc.deps.opts
stage1.base.ghc.link.opts stage1.base.ghc.toolargs.opts
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f8bf98ea5b726d3f874faf23d4934765ed1116b">7f8bf98e</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-07-09T22:58:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix source-dist rule
The first problem was that the list of files/dirs to embed or ignore was not
up-to-date. The second problem was that the 'Cwd' option used when running the
Tar builder in the source-dist rule didn't actually change the current directory
and was therefore failing. Finally, the source-dist rule did not pre-generate
Haskell modules derived from .x (alex) and .y (happy) files, like the Make
build system does -- this is now fixed.
We might be doing too much work for that last step (we seem to be building
many things until we get to generating the source distribution), but extracting
the distribution and running
./configure && hadrian/build.sh --flavour=quickest -j
from there does work for me now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7423f1096b5415928ba1d1d621e066ef4e5b641">d7423f10</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-07-09T22:58:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite tweaks and refactoring
- Rename requires_th to req_th for consistency with other req functions
(e.g. req_interp, req_profiling etc.)
- req_th (previously requires_th) now checks for interpreter (via
req_interp). With this running TH tests are skipped when running the
test suite with stage=1.
- Test tweaks:
- T9360a, T9360b: Use req_interp
- recomp009, T13938, RAE_T32a: Use req_th
- Fix check-makefiles linter: it now looks for Makefiles instead of .T
files (which are actually Python files)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/897a59a5c0a08985ddccf00a4961cc2d080324e8">897a59a5</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-07-09T22:59:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactoring in CoreSimpl
When `join_ids` is empty `extendVarSetList existing_joins join_ids` is
already no-op, so no need to check whether `join_ids` is empty or not
before extending the joins set.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85da17e5518cfc88c23964e6ffcad07886da5b59">85da17e5</a></strong>
<div>
<span>by Eric Wolf</span>
<i>at 2019-07-09T23:00:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add testcase T16804 for #16804
slightly larger testcase for :type-at and :uses
so we can see changes, if #16804 is done.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8fcc931c9ee63077e387b8c65851f788196559c2">8fcc931c</a></strong>
<div>
<span>by Eric Wolf</span>
<i>at 2019-07-09T23:00:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">T16804: adjust src spans
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a35e091616a24b57c229cf50c8d43f8f6bfb5524">a35e0916</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-09T23:00:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/doc: Add some discussion of compilation stages
This documents some of the lore surrounding the nature and naming of
GHC's stage numbers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2e290d3280841647354ddf5ca9abdd974bce0d5">d2e290d3</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-07-09T23:01:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix erroneous float in CoreOpt
The simple optimiser was making an invalid transformation
to join points -- yikes. The fix is easy.
I also added some documentation about the fact that GHC uses
a slightly more restrictive version of join points than does
the paper.
Fix #16918
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb5271ac9a6686d065de63d1dde80e713830e21b">cb5271ac</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-07-11T17:46:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for old panic on inlining undeclared identifier (#495)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01ec8549871ebc43db3a7e28324222fa739c6531">01ec8549</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-07-11T17:46:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Special case a few common patterns in unionLists.
In particular we very often pass one empty list and in these
cases we want to avoid the overhead of computing `xs ++ []`.
This should fix #14759 and #16911.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b507acebdc3dbec53c54ae07175b39da4066d4f8">b507aceb</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-07-11T17:47:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't typecheck too much (or too little) in DerivingVia (#16923)
Previously, GHC would typecheck the `via` type once per class in a
`deriving` clause, which caused the problems observed in #16923.
This patch restructures some of the functionality in `TcDeriv` and
`TcHsType` to avoid this problem. We now typecheck the `via` type
exactly once per `deriving` clause and *then* typecheck all of the
classes in the clause.
See `Note [Don't typecheck too much in DerivingVia]` in `TcDeriv`
for the full details.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8449c5b699c3a1a0e363ce75b1f151b38411298f">8449c5b6</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-07-11T17:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow reusing temporary object files generated by GHCi by writing to -odir in case -fwrite-interface was specified (#16670)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d5c899d1f62a58fedab29640a47fdb6e9590b9ea">d5c899d1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-11T17:48:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">head.hackage: Run build on head.hackage's master branch
The GitLab CI infrastructure is now in the master branch.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a20938459ee8cd2f251faac97904aa5c9da7ec1">8a209384</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-11T17:48:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">head.hackage: Run builds with -dcore-lint
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e4c73514ca3213efb9e2b0de44ddf77747a29a3b">e4c73514</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-07-12T02:20:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix kind-checking for data/newtypes
In one spot in kcConDecl we were passing in the return
kind signature rether than the return kind. e.g. #16828
newtype instance Foo :: Type -> Type where
MkFoo :: a -> Foo a
We were giving kcConDecl the kind (Type -> Type), whereas it
was expecting the ultimate return kind, namely Type.
This "looking past arrows" was being done, independently,
in several places, but we'd missed one. This patch moves it all
to one place -- the new function kcConDecls (note the plural).
I also took the opportunity to rename
tcDataFamHeader to tcDataFamInstHeader
(The previous name was consistently a source of confusion.)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de3935a6ccc26ec063e13d2739dd098c7616fde2">de3935a6</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2019-07-12T02:20:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add shake 0.18.3 to extra deps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a31b24a591aecc734449d3af479e3a3d1834b0ed">a31b24a5</a></strong>
<div>
<span>by Ashley Yakeley</span>
<i>at 2019-07-13T16:35:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Data.Fixed: make HasResolution poly-kinded (#10055, #15622)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/688a1b89584327d6ba0d3ec9558a3cd8a111c655">688a1b89</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-07-13T16:36:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: trace SysTools commands to emit start/stop eventlog markers
This patch was motivated by some performance characterization work done
for #16822, where we suspected that GHC was spending a lot of time waiting
on the linker to be done. (That turned out to be true.)
The tracing is taken care of by ErrUtils.withTiming, so this patch just defines
and uses a little wrapper around that function in all the helpers for
calling the various systools (C compiler, linker, unlit, ...).
With this patch, assuming a GHC executable linked against an eventlog-capable
RTS (RTS ways that contain the debug, profiling or eventlog way units), we can
measure how much time is spent in each of the SysTools when building hello.hs
by simply doing:
ghc hello.hs -ddump-timings +RTS -l
The event names are "systool:{cc, linker, as, unlit, ...}".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/348cc8ebf1508b057a85551e5f6e699bb4cd8ade">348cc8eb</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-07-13T16:36:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two CmmSwitch optimizations.
Move switch expressions into a local variable when generating switches.
This avoids duplicating the expression if we translate the switch
to a tree search. This fixes #16933.
Further we now check if all branches of a switch have the same
destination, replacing the switch with a direct branch if that
is the case.
Both of these patterns appear in the ENTER macro used by the RTS
but are unlikely to occur in intermediate Cmm generated by GHC.
Nofib result summary:
--------------------------------------------------------------------------------
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
Min -0.0% -0.0% -15.7% -15.6% 0.0%
Max -0.0% 0.0% +5.4% +5.5% 0.0%
Geometric Mean -0.0% -0.0% -1.0% -1.0% -0.0%
Compiler allocations go up slightly: +0.2%
Example output before and after the change taken from RTS code below.
All but one of the memory loads `I32[_c3::I64 - 8]` are eliminated.
Instead the data is loaded once from memory in block c6.
Also the switch in block `ud` in the original code has been
eliminated completely.
Cmm without this commit:
```
stg_ap_0_fast() { // [R1]
{ []
}
{offset
ca: _c1::P64 = R1; // CmmAssign
goto c2; // CmmBranch
c2: if (_c1::P64 & 7 != 0) goto c4; else goto c6;
c6: _c3::I64 = I64[_c1::P64];
if (I32[_c3::I64 - 8] < 26 :: W32) goto ub; else goto ug;
ub: if (I32[_c3::I64 - 8] < 15 :: W32) goto uc; else goto ue;
uc: if (I32[_c3::I64 - 8] < 8 :: W32) goto c7; else goto ud;
ud: switch [8 .. 14] (%MO_SS_Conv_W32_W64(I32[_c3::I64 - 8])) {
case 8, 9, 10, 11, 12, 13, 14 : goto c4;
}
ue: if (I32[_c3::I64 - 8] >= 25 :: W32) goto c4; else goto uf;
uf: if (%MO_SS_Conv_W32_W64(I32[_c3::I64 - 8]) != 23) goto c7; else goto c4;
c4: R1 = _c1::P64;
call (P64[Sp])(R1) args: 8, res: 0, upd: 8;
ug: if (I32[_c3::I64 - 8] < 28 :: W32) goto uh; else goto ui;
uh: if (I32[_c3::I64 - 8] < 27 :: W32) goto c7; else goto c8;
ui: if (I32[_c3::I64 - 8] < 29 :: W32) goto c8; else goto c7;
c8: _c1::P64 = P64[_c1::P64 + 8];
goto c2;
c7: R1 = _c1::P64;
call (_c3::I64)(R1) args: 8, res: 0, upd: 8;
}
}
```
Cmm with this commit:
```
stg_ap_0_fast() { // [R1]
{ []
}
{offset
ca: _c1::P64 = R1;
goto c2;
c2: if (_c1::P64 & 7 != 0) goto c4; else goto c6;
c6: _c3::I64 = I64[_c1::P64];
_ub::I64 = %MO_SS_Conv_W32_W64(I32[_c3::I64 - 8]);
if (_ub::I64 < 26) goto uc; else goto uh;
uc: if (_ub::I64 < 15) goto ud; else goto uf;
ud: if (_ub::I64 < 8) goto c7; else goto c4;
uf: if (_ub::I64 >= 25) goto c4; else goto ug;
ug: if (_ub::I64 != 23) goto c7; else goto c4;
c4: R1 = _c1::P64;
call (P64[Sp])(R1) args: 8, res: 0, upd: 8;
uh: if (_ub::I64 < 28) goto ui; else goto uj;
ui: if (_ub::I64 < 27) goto c7; else goto c8;
uj: if (_ub::I64 < 29) goto c8; else goto c7;
c8: _c1::P64 = P64[_c1::P64 + 8];
goto c2;
c7: R1 = _c1::P64;
call (_c3::I64)(R1) args: 8, res: 0, upd: 8;
}
}
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/232002c44942491759e44aa93a03a6bc68afbadf">232002c4</a></strong>
<div>
<span>by James Foster</span>
<i>at 2019-07-13T16:37:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make HsInstances and DynFlags compile with -O0 for Stage0 to speed up Hadrian builds (fixes #16936)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7176fa1bf42dd4f22381d238f6e65d76290887e">a7176fa1</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-07-13T16:38:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactoring in CmmBuildInfoTables
- Replace `catMaybes (map ...)` with `mapMaybe ...`
- Remove a list->set->list conversion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ff04eb5973b69fcc60e7d0945a74becd068c1888">ff04eb59</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-14T01:19:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove purely external primops
The compiler doesn't create uses nor compiles the uses that exist
specially. These are just plain C-- FFI.
These `await*` ones are especially important to so convert because "true"
primops are hard to make platform-specific currently.
The other exports are part of this commit so this module always exports
something, which avoids silly CPP elsewhere. More will be added later
once `foreign import prim` is extended.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9b00038696ce40aed68ee561c501184b34a1cf3">f9b00038</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-07-14T01:19:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Build debug rts with -O0 -g3 and disable rts stripping
Fixes #16920
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f508b7ce56f1e7dc2666de3139f58c02a0567461">f508b7ce</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-14T01:20:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't package settings in bindist
Since !712 the `settings` file is produced by the build system instead
of autoconf. However, this introduced a subtle bug where we would fail
to rebuild the `settings` file with what we have learned from the
install-time `configure` invocation. Fix this by not packaging
`settings` in the bindist tarball. The build system will take care of
the rest.
Also fix a bug where the value of `UseLibdw` was not being persisted to
the install time `configure`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e7ed53c9c347bbf6650f268b516da6e6c156a91a">e7ed53c9</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-14T01:21:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove LLVM_TARGET platform macros
Instead following @angerman's suggestion put them in the config file.
Maybe we could re-key llvm-targets someday, but this is good for now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd9fc1b2adea718be089b8370d2e82ea55af6539">bd9fc1b2</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-14T01:21:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make CPP linter skip certain files
- docs which document the lint and need to contain the unutterable
- vendored code which is outside our purview
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7c6c4717cdf1b7bd8550e37da66c52275c802f0">d7c6c471</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-14T01:21:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expunge #ifdef and #ifndef from the codebase
These are unexploded minds as far as the linter is concerned. I don't
want to hit in my MRs by mistake!
I did this with `sed`, and then rolled back some changes in the docs,
config.guess, and the linter itself.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fce8f240a23ebbf04fd7e769919b00eee9737028">fce8f240</a></strong>
<div>
<span>by xplorld</span>
<i>at 2019-07-14T08:32:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rename type parameter in `instance Applicative ((->) a)`, fixing #16928
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78ed46f3838ef33e9cf337c1c0fa2d208b10bab0">78ed46f3</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2019-07-14T08:33:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">primops: haddock: Fix typo in referenced function.
Found by @lehins.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a39a3cd663273c46cf4e346ddf3bf9fb39195c9d">a39a3cd6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-15T00:14:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable submodule linter for now
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0670f98adafdc863bc51b59b276668cfef60b365">0670f98a</a></strong>
<div>
<span>by Arnaud Spiwack</span>
<i>at 2019-07-15T09:23:15+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a note in the simplifier about in-scope set as a substitution
See also the discussion at #16592
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/284a2f44666c88616c9f4426e566014f8685669c">284a2f44</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-07-15T18:29:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Decouple AddAnn from P
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1befd2c00f8a8fc1ca62ef18ca3028c58e35dabd">1befd2c0</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-07-15T18:29:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PV is not P (#16611)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5728d9faafe410d1e0c3a070bb8882721470b798">5728d9fa</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2019-07-16T02:40:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Sort out Hadrian colored output flags (fix #16397)
Hadrian used to have a separate flag --progress-colour to control
colored output during the build. After introduction of a Shake flag
with similar purpose Hadrian's flag became redundant. The commit removes
--progress-colour and switches to Shake's flag. The only difference
between the two is that Hadrian has special default mode when it tries
to determine if the terminal support colored output. The user can
override it using (Shake's) `--[no-]color`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db948daea6c01c073f8d09a79fa5adda279fbf0c">db948dae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-16T02:40:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Add support for SIMD operations in the NCG"
Unfortunately this will require more work; register allocation is
quite broken.
This reverts commit acd795583625401c5554f8e04ec7efca18814011.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/373c9cb379bd64c4d295becf3afce122a6e199f4">373c9cb3</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-07-16T02:41:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Divorce init of Heap profiler from CCS profiler
Currently initProfiling gets defined by Profiling.c only if PROFILING is
defined. Otherwise the ProfHeap.c defines it.
This is just needlessly complicated so in this commit I make Profiling and
ProfHeap into properly seperate modules and call their respective init
functions from RtsStartup.c.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/52f755aa203c55e44dce79c9ac1abc245977b000">52f755aa</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-07-16T02:41:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Rename the nondescript initProfiling2 to refreshProfilingCCSs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a9b77b8b4313a9ffe7483cbc286d249fda59e75">0a9b77b8</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-17T12:20:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Create {Int,Word}32Rep
This prepares the way for making Int32# and Word32# the actual size they
claim to be.
Updates binary submodule for (de)serializing the new runtime reps.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8add024fabfe8da20fafc9a571eb282cf32363ae">8add024f</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-07-17T12:20:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make GHC-in-GHCi work on Windows
By not building anything in the dynamic way on Windows, where we don't
have a working story for DLLs yet.
Also the ghcid command needs to call bash on the hadrian/ghci.sh script
explicitly as the path gets interpreted differently otherwise.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d48da6fff8125ed5cbb5be7740556fed13fe1bb3">d48da6ff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Run slow validate in -debug job
Otherwise we don't compile the stage2 compiler with DEBUG, meaning the
testsuite isn't checked with assertions.
Metric Increase:
haddock.Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/272246bf137a30886f6bed676dc4edf9d0f493ba">272246bf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: More type checking fixes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7bcd017110b05af99e72b7bbcc232368f22dda7">c7bcd017</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add HasDebugCallStack to unionLists
This should help identify a few cases where this is throwing warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cec2af64bff0c89aa34dd95a75ee752f25135d5">3cec2af6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark static-plugins as broken in profiled ways
See #16803.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8adffb528f65749b5648c44ab711ef9aec4c69a">e8adffb5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Set -dinitial-unique when reversing uniques
Otherwise the unique counter starts at 0, causing us to immediately
underflow.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9e9d8c97cc6f3f96466969a48a03f7be5999de2">b9e9d8c9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix req_th
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d238d3062a9858fef667c6fbf80605b8209a937f">d238d306</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix formatting of --info's "Debug on" field
As noted in #16914, the value `True` was used instead of `YES` here, in
contrast to the other boolean fields emitted by `--info`. This confused
the testsuite driver and broke the `ghc_debugged` testsuite predicate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb8c40e3c9e1df6f1f35d8f711cf58e13c629295">eb8c40e3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark hWaitForInput-accurate-stdin as broken in all threaded ways
Previously it was not marked as broken in profthreaded
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b16cabc1b7ea1fd087df8f9ab977da629c92af9f">b16cabc1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Print output from hp2ps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b62a2dfb31a95b99d7981c6855edda4ea8097a75">b62a2dfb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix some ints used as bools
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3df1efb539dc42d10d8685a7ca2aaf315e21af1">b3df1efb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip forking tests in profiled ways
As noted in #11645 and #8862, forking and profiling don't go well
together.
Bumps hpc and unix submodules.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49dcbf8642f74cf52463ef458f13ff59ed8eafa5">49dcbf86</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark test-hole-plugin as req_th
This requires code loading and therefore can't be run in the profiled
ways when GHC is dynamically linked.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce8ffd800ad35a6e5443933b50e6b2dd2f331cc6">ce8ffd80</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Unmark recomp007 as broken
Fixed in #14759.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82abc479ab33183a5572ddc8cb3c4dbea8f06a0d">82abc479</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-18T20:55:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T4808 as broken in threaded2 way
As noted in #16909.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73703d9b24c4c4182a59fd17db12e3fb36a16167">73703d9b</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2019-07-19T18:06:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hide "Loading package environment" message with -v0 (fix #16879)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9372ff927a18e83e61557f5bca8ef054e39dee41">9372ff92</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-07-19T18:06:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Drop the orphan roles check (#16941)
9366e019 introduced a check for orphan roles to fix #8485
6ab5da99 changed the lookup code and made the check redundant.
Now it is removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69adb25329257b38d465c8c7896377918449fdd0">69adb253</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-07-19T18:07:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16870 by improving documentation (only)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1980a1e8a05eca244bbc018c0d590e535112f35">f1980a1e</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-07-19T18:08:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make generated ghc-stage<n> scripts executable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bec17997c40cd0a68004a5a9fb4d3cf2a39711ad">bec17997</a></strong>
<div>
<span>by James Foster</span>
<i>at 2019-07-19T18:08:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: corrected -fmax-relevant-binds reverse to be -fno-max-relevant-binds</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/257d1fd86e6e5e7d145d71707904d8fe54024041">257d1fd8</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-07-19T18:09:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't maintainer-clean libraries/ghc-boot/ghc.mk (#16953)
This makes the `maintainer-clean` rule in `ghc.mk` slightly more
sophisticated so that it does not remove the version-controlled
file `libraries/ghc-boot/ghc.mk`, which was checked into version
control in commit 24782b89907ab36fb5aef3a17584f4c10f1e2690.
Fixes #16953.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ff996555b97f18d27f82a53c0a9bb32203cb8819">ff996555</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-07-19T18:10:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add module doc for Plugins.
This was requested in #15650.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/08ad7ef4d26d40f94ba01fdbcadc5c50aeba8ad8">08ad7ef4</a></strong>
<div>
<span>by Baldur Blöndal</span>
<i>at 2019-07-20T07:51:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Added do-notation examples for Functor, Applicative and Monad combinators.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b42ece52049756e046729a7c6f43b544bfd9ea6">7b42ece5</a></strong>
<div>
<span>by Alfredo Di Napoli</span>
<i>at 2019-07-20T07:52:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Line wrap when pp long expressions (fixes #16874)
This commit fixes #16874 by using `fsep` rather than `sep` when pretty
printing long patterns and expressions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3676375f28d4dd6cce9fb0ebe8aca4873004bb87">3676375f</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-07-20T07:52:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump nofib submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4dfd6a5fd633706d6ebacfc962b656b7cca85a39">4dfd6a5f</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-07-20T07:53:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Remove RTS -Waggregate-return warning
This was removed from make in 077b92fa39839a8e83cd87398435424403cf6486</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5042ba9dbe0caff2e33a4f7f5a78f2f61eaf6a32">5042ba9d</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-07-21T05:03:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expose the GhcPrelude module.
This makes it simpler to load Modules importing it
when using ghc-the-package.
-------------------------
Metric Decrease:
haddock.compiler
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67ee741bd6a7017a62719c3c25a5447a0b03191e">67ee741b</a></strong>
<div>
<span>by Ivan Kasatenko</span>
<i>at 2019-07-21T05:03:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not ignore events deletion when events to be added are provided (#16916)
Kqueue/kevent implementation used to ignore events to be unsubscribed
from when events to be subscribed to were provided. This resulted in a
lost notification subscription, when GHC runtime didn't listen for any
events, yet the kernel considered otherwise and kept waking up the IO
manager thread.
This commit fixes this issue by always adding and removing all of the
provided subscriptions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32be44613fed3fa7bff7190381acbdaa8ea15cfc">32be4461</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-07-21T05:04:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #8487: Debugger confuses variables
To display the free variables for a single breakpoint, GHCi pulls out the
information from the fields `modBreaks_breakInfo` and `modBreaks_vars`
of the `ModBreaks` data structure. For a specific breakpoint this gives 2
lists of types 'Id` (`Var`) and `OccName`. They are used to create the Id's
for the free variables and must be kept in sync:
If we remove an element from the Names list, then we also must remove the
corresponding element from the OccNames list.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4854a3490518760405f04826df1768b5a7b96da2">4854a349</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-21T05:04:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-cabal: Use fromFlagOrDefault instead of fromFlag
As fromFlag is partial. The only case where we used fromFlag is when
determining whether to strip libraries; we now assume that we shouldn't.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c7a84627556cda9491300ba61f3060e357bc3ac">4c7a8462</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2019-07-23T11:43:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sure to load interfaces when running :instances
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9af30f856b0e6f78d6857fc6d69db3495bb1635">f9af30f8</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-07-23T11:44:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove fix-submodules.py
Now that we have absolute paths for submodules (since a76b233d) we no
longer need this script.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ade71fbaa87c116c6ab8322259a795894cde1f6">6ade71fb</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-07-23T23:06:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: run the testsuite in Windows CI job
Since MR !1025 fixed the Windows build, allowing us to build a binary
distribution, we can now run the testsuite in that CI job.
This required fixing 'createFileLink': it should not try to create
symlinks on Windows (that requires admin priviledges, which Hadrian can't
assume). We now instead fall back to copying.
This patch also removes some duplicated logic for iserv in the test rules,
where we handle our dependency on the iserv binaries in a special way.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3dbcc3682066450b0fe1e74f9d82472d5c603d3b">3dbcc368</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-07-23T23:07:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simon and I like to work in hsSyn, too.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b95b63806b5a9764902d3ae556ba31d17ecd1ec3">b95b6380</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-07-24T16:49:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make stage 1 GHC target independent
Now that the target macros are not being used, we remove them. This
prevents target hardcoding regressions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0f8ed206479b8ad699d4eae95c063df9376fac4">d0f8ed20</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-24T16:50:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix source tarball job
* Use show! in source tarball job. Since we aren't actually building
anything in this job `show` won't
work.
* Fix Docker image name
* Make `version` file contain only version string
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90dd2ea0aedb554702db5250e7da9eedb87e5c13">90dd2ea0</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-07-24T23:11:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ASSERT(vis_flag==ForallInvis) in hsScopedTvs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e07f0e2bec525a147518fceb139cad402e00ed8c">e07f0e2b</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-07-24T23:11:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Drop unused helpers 'mkTyClGroup' and 'emptyTyClGroup'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb495b3cb416be82e36dbb4eca10a68743ebc549">cb495b3c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-07-25T17:25:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make DefUses = OrdList DefUse
Before, `type DefUses = [DefUse]`. But lists are a terrible choice of
data structure here, as we frequently append to the right of a
`DefUses`, which yields some displeasing asymptotics. Let's instead
use `OrdList`, which has constant-time appending to the right.
This is one step on the way to #10347.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9c99df1a4cdd23bcd26db7ae6ee7ee6464d654e">b9c99df1</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-07-25T17:26:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Printer: add an empty line between bindings in Rec STG binding groups
Before:
Rec {
x2_r10T :: Lib.Bar
[GblId, Unf=OtherCon []] =
CCS_DONT_CARE Lib.Bar! [x3_r10U];
x3_r10U :: Lib.Foo
[GblId, Unf=OtherCon []] =
CCS_DONT_CARE Lib.Foo! [x1_r10p x2_r10T];
end Rec }
After:
Rec {
x2_r10T :: Lib.Bar
[GblId, Unf=OtherCon []] =
CCS_DONT_CARE Lib.Bar! [x3_r10U];
x3_r10U :: Lib.Foo
[GblId, Unf=OtherCon []] =
CCS_DONT_CARE Lib.Foo! [x1_r10p x2_r10T];
end Rec }
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30b6f391801d58e364f79df5da2cf9f02be2ba5f">30b6f391</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-07-26T00:57:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Banish reportFloatingViaTvs to the shadow realm (#15831, #16181)
GHC used to reject programs of this form:
```
newtype Age = MkAge Int
deriving Eq via Const Int a
```
That's because an earlier implementation of `DerivingVia` would
generate the following instance:
```
instance Eq Age where
(==) = coerce @(Const Int a -> Const Int a -> Bool)
@(Age -> Age -> Bool)
(==)
```
Note that the `a` in `Const Int a` is not bound anywhere, which
causes all sorts of issues. I figured that no one would ever want to
write code like this anyway, so I simply banned "floating" `via` type
variables like `a`, checking for their presence in the aptly named
`reportFloatingViaTvs` function.
`reportFloatingViaTvs` ended up being implemented in a subtly
incorrect way, as #15831 demonstrates. Following counsel with the
sage of gold fire, I decided to abandon `reportFloatingViaTvs`
entirely and opt for a different approach that would _accept_
the instance above. This is because GHC now generates this instance
instead:
```
instance forall a. Eq Age where
(==) = coerce @(Const Int a -> Const Int a -> Bool)
@(Age -> Age -> Bool)
(==)
```
Notice that we now explicitly quantify the `a` in
`instance forall a. Eq Age`, so everything is peachy scoping-wise.
See `Note [Floating `via` type variables]` in `TcDeriv` for the full
scoop.
A pleasant benefit of this refactoring is that it made it much easier
to catch the problem observed in #16181, so this patch fixes that
issue too.
Fixes #15831. Fixes #16181.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aae0457f412aa40dd192ca2cbea565ea60b182ec">aae0457f</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-07-26T00:57:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Change behaviour of -ddump-cmm-verbose to dump each Cmm pass output to a separate file and add -ddump-cmm-verbose-by-proc to keep old behaviour (#16930)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/00d9d28405a5983ae40a1815a146fb27abca10e8">00d9d284</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-07-26T00:58:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TemplateHaskell: reifyType (#16976)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea08fa37c05303dea42f6ce2e9fdfe16e73a4df7">ea08fa37</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-07-26T00:58:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">reifyTypeOfThing: panic on impossible cases
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c9fb2f0eb7d362c569a05bd509a1571f9257678">7c9fb2f0</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2019-07-26T09:49:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-heap: implement WEAK closure type #16974
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/26314386789e3717427bab4bcb97755535bb12d4">26314386</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-07-26T09:49:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #16946
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd11f81f71e99a699a5ee8120bde9cb9d7e26d6b">cd11f81f</a></strong>
<div>
<span>by Fumiaki Kinoshita</span>
<i>at 2019-07-28T19:47:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: add Functor, Applicative, Monad, Alternative, MonadPlus, Generic and Generic1 instances to Kleisli
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1a06d49593d88c59c2a625154191890a05b90f9">c1a06d49</a></strong>
<div>
<span>by Dale Wijnand</span>
<i>at 2019-07-28T19:48:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: relink to the flavours doc in the ghc repo</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f8cdb358d05192bfdb62a8ee599a652d6dce8ff">9f8cdb35</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-07-29T19:32:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Note [RuntimeRep and PrimRep] in RepType
Also adds Note [Getting from RuntimeRep to PrimRep], which
deocuments a related thorny process.
This Note addresses #16964, which correctly observes that
documentation for this thorny design is lacking.
Documentation only.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86f47b8e26726d8629e5d9df44c573aced0a4d65">86f47b8e</a></strong>
<div>
<span>by Dale Wijnand</span>
<i>at 2019-07-29T19:32:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Drop a stale limitation tracking issue
https://github.com/snowleopard/hadrian/issues/187 was superseded by
https://github.com/snowleopard/hadrian/issues/669, which has also
been closed.
So, optimistically, dropping this as a limitation issue.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c8a211a8592dbc7349eb336ff37e3cdfe698efe">9c8a211a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-07-30T01:33:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expand the preallocated Int range to [-16,255]
Effects as I measured them:
RTS Size: +0.1%
Compile times: -0.5%
Runtine nofib: -1.1%
Nofib runtime result seems to mostly come from the `CS` benchmark
which is very sensible to alignment changes so this is likely over
represented.
However the compile time changes are realistic.
This is related to #16961.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2829f6dab5e860e61dba970a536709380c9d993d">2829f6da</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-07-30T01:34:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply a missing substitution in mkEtaWW (#16979)
The `mkEtaWW` case for newtypes forgot to apply the substitution to
the newtype coercion, resulting in the Core Lint errors observed
in #16979. Easily fixed.
Fixes #16979.
Co-authored-by: Ryan Scott <ryan.gl.scott@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/371dadfbbc35abfcd41c41b6e92745d87bd48cd5">371dadfb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-31T04:27:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Break up TyCoRep
This breaks up the monstrous TyCoReps module into several new modules by
topic:
* TyCoRep: Contains the `Coercion`, `Type`, and related type
definitions and a few simple predicates but nothing further
* TyCoPpr: Contains the the pretty-printer logic
* TyCoFVs: Contains the free variable computations (and
`tyConAppNeedsKindSig`, although I suspect this should change)
* TyCoSubst: Contains the substitution logic for types and coercions
* TyCoTidy: Contains the tidying logic for types
While we are able to eliminate a good number of `SOURCE` imports (and
make a few others smaller) with this change, we must introduce one new
`hs-boot` file for `TyCoPpr` so that `TyCoRep` can define `Outputable`
instances for the types it defines.
Metric Increase:
haddock.Cabal
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b6fa7fe350df8155caf9ebe16675e7924020eb7b">b6fa7fe3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-31T04:27:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitignore: Add .mypy_cache
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88410e779db119f9e020567545b6749555ec2af4">88410e77</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-31T04:27:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move tyConAppNeedsKindSig to Type
Previously it was awkwardly in TyCoFVs (and before that in TyCoRep).
Type seems like a sensible place for it to live.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/787fab43e06456e6889a47764d7bd8c5d81ab5cb">787fab43</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-31T04:27:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Work around redundant import issue
As mentioned in #16997, GHC currently complains about this import.
In general I'm reluctant to paper over things like this but in the case
of an hs-boot file I think adding an import list is the right thing to
do regardless of the bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e04841c4641e2249066614065053166657e3eb4">5e04841c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-07-31T13:53:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix it after upgrade
It seems that the regular expression parser changed in GitLab 12.1 and
now does now support forward slashes in the RE, even when escaped.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/986643cb3506f2eedce96bf2d2c03873f105fad5">986643cb</a></strong>
<div>
<span>by Ivan Kasatenko</span>
<i>at 2019-08-01T13:49:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix T16916 CI failures (#16966)
1. Slightly increased the waiting time for the tested effect to be more
profound.
2. Introduced measuring of the actual time spent waiting and adjusing
CPU time by it to compensate for threadDelay waiting time
inconsistencies.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9552114006ea81e379228706caf30cbe3323e1d2">95521140</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-08-02T08:14:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add StandaloneDeriving example for DerivingVia.
[skip-ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b9d32b8b8d55335bed7fb3677054327c6072768">1b9d32b8</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-08-02T08:14:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rip out 9-year-old pattern variable hack (#17007)
GHC had an ad hoc validity check in place to rule out pattern
variables bound by type synonyms, such as in the following example:
```hs
type ItemColID a b = Int -- Discards a,b
get :: ItemColID a b -> ItemColID a b
get (x :: ItemColID a b) = x :: ItemColID a b
```
This hack is wholly unnecessary nowadays, since OutsideIn(X) is more
than capable of instantiating `a` and `b` to `Any`. In light of this,
let's rip out this validity check.
Fixes #17007.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93bed40a0efdcb0ecea2406c22c402896e4ecfd8">93bed40a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-08-02T08:15:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use injectiveVarsOfType to catch dodgy type family instance binders (#17008)
Previously, we detected dodgy type family instances binders by
expanding type synonyms (via `exactTyCoVarsOfType`) and looking for
type variables on the RHS that weren't mentioned on the (expanded)
LHS. But this doesn't account for type families (like the example
in #17008), so we instead use `injectiveVarsOfType` to only count
LHS type variables that are in injective positions. That way, the `a`
in `type instance F (x :: T a) = a` will not count if `T` is a type
synonym _or_ a type family.
Along the way, I moved `exactTyCoVarsOfType` to `TyCoFVs` to live
alongside its sibling functions that also compute free variables.
Fixes #17008.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c902f56b7f7b79d8b7480895c2236106578fbd4d">c902f56b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-08-02T08:16:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove build.nix.sh
This file refers to shell.nix, which was removed in
430e6fedfda and c00d2f59d.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e960287b74ce2e11be98dbf7c1dc4ce2d7e0d9a">5e960287</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2019-08-02T08:16:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: fixs -prof links in rts-flags section
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c5cd771a8792ca4a4a553d3d4636e32191ef936">0c5cd771</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-08-02T22:20:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: emit finer grained codegen events to eventlog
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ecacb1ee6d353f85b83a63941b6e26f1ff9f4db">0ecacb1e</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-08-02T22:20:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Note [withTiming] in compiler/main/ErrUtils.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4664bafcb8db9f7cbcc9d16b0b1d381650b682c2">4664bafc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-02T22:20:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Always truncate output files
Previously there were numerous places in the RTS where we would fopen
with the "w" flag string. This is wrong as it will not truncate the
file. Consequently if we write less data than the previous length of the
file we will leave garbage at its end.
Fixes #16993.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3cbe319dbe2f6a64ea3108dcd8d42e7876e5b34">e3cbe319</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-02T22:21:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Packages: Add timing for package database initialization
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5227080b57cb51ac34d4c9de1accdf6360b818b">a5227080</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-08-02T22:22:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: make settings, platformConstants, etc dependencies of lib:ghc
This fixes #17003, where a user directly asked for the 'docs-haddock' target
without building a complete stage 2 GHC first. Since haddock only depends on
lib:ghc, the stage 2 GHC executable wasn't built, and neither were the
settings, platformConstants, llvm-passes and llvm-targets files, since they
are declared to be dependencies of exe:ghc.
This makes sense in general since all GHC API users (haddock is one) will likely
want those files to be there.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e404afd7c923bf275093c7fa1b278d484cfdd82">7e404afd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-04T18:16:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Manually set SPHINXBUILD on Windows
For some reason configure seems unable to find it on its own. Let's try
giving it a hint.
Addresses #16398.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a061d18c759cd396bb71d82688ffb28f5d27c94">8a061d18</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-08-04T18:17:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update .gitignore
Add some files generated by hadrian and some tooling files
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d8d0012acd8701c0bb562376fd8321009342dcd">7d8d0012</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-08-04T18:18:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't float unlifted join points to top level
Ticket #16978 showed that we were floating a recursive,
unlifted join point to top level. It's very much a corner
case:
joinrec j :: Int#
j = jump j
in ...
But somehow it showed up in a real program.
For non-recursive bindings in SetLevels.lvlBind we were already
(correctly) checking for unlifted bindings, but when I wrote
that code I didn't think that a /recursive/ binding could be
unlifted but /join-points/ can be!
Actually I don't think that SetLevels should be floating
join points at all. SetLevels really floats things to move
stuff out of loops and save allocation; but none of that applies
to join points. The only reason to float join points is in
cases like
join j1 x = join j2 y = ...
in ...
which we might want to swizzle to
join j2 x y = ... in
join j1 x = ...
in ...
because now j1 looks small and might be inlined away altogether.
But this is a very local float perhaps better done in the simplifier.
Still: this patch fixes the crash, and does so in a way that is
harmless if/when we change our strategy for floating join points.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b31a94df4cf7e55d93dfcad9b96d0f49f4d3f8d">3b31a94d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-04T18:18:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add testsuite for #16978
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e031806e7a25d56156c1b2fa2a61d3f73d46402">2e031806</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-04T18:18:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Search for LLVM executables with two-number versions
Fedora uses the naming llc-7.0 while Debian uses llc-7. Ensure that both
are found.
Fixes #16990.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e5dfcd2886d7523cfa059a64b343b22c5da4e97">6e5dfcd2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-04T18:19:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Rework tracking of fragile tests
Breaks fragile tests into two groups, allowing us to easily preserve
stdout/stderr of failing fragile tests.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea16f6cb22148982f9a0956be82288d380c1d9d9">ea16f6cb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-08-06T20:24:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead parameter from coreToStgApp
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c1ccf3cad5da8ae974c2813767cfcc489391e21">0c1ccf3c</a></strong>
<div>
<span>by James Foster</span>
<i>at 2019-08-06T20:25:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Refactor file patterns for future Shake changes (fixes #17005)
Shake will be moving from its current implementation of ?== to one from
System.FilePattern. Support for `//` is being dropped, leaving only `*`
and `**` as special forms. This commit converts the existing file
patterns in Hadrian to the new format. It also removes all occurances
of <//> and changes the user-settings docs to remove references to //
and add **.
The conversion is as follows:
- //a ==> **/a
- a// ==> a/**
- a//b ==> a/**/b
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c83e39bf91cfeb17a54ccfd5d01bfdfa1b4a72c9">c83e39bf</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-08-06T20:25:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove old/broken(?) .ghci script
I was attempting to load hadrian into ghci by using
`cabal new-repl exe:hadrian` but it failed because it tried
to use this `.ghci` configuration.
I'm not sure who used this script but you should really use the new-repl
method.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f116005a144b3f09381e0a5967a364eb57a5aa5">6f116005</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-06T20:26:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce a type for "platform word size", use it instead of Int
We introduce a PlatformWordSize type and use it in platformWordSize
field.
This removes to panic/error calls called when platform word size is not
32 or 64. We now check for this when reading the platform config.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2073745c70d830373c67b908e5c42d3cd18c057a">2073745c</a></strong>
<div>
<span>by mniip</span>
<i>at 2019-08-07T10:18:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a -fprint-axiom-incomps option (#15546)
Supply branch incomps when building an IfaceClosedSynFamilyTyCon
`pprTyThing` now has access to incomps. This also causes them to be
written out to .hi files, but that doesn't pose an issue other than a
more faithful bijection between `tyThingToIfaceDecl` and `tcIfaceDecl`.
The machinery for displaying axiom incomps was already present but not
in use. Since this is now a thing that pops up in ghci's :info the
format was modified to look like a haskell comment.
Documentation and a test for the new feature included.
Test Plan: T15546
Reviewers: simonpj, bgamari, goldfire
Reviewed By: simonpj
Subscribers: rwbarton, carter
GHC Trac Issues: #15546
Differential Revision: https://phabricator.haskell.org/D5097
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bca793458c77302c1d46766b7f563c1cc4c17579">bca79345</a></strong>
<div>
<span>by mniip</span>
<i>at 2019-08-07T10:18:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix test
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d32286d212b49c95eba7aa2e013185740099aa1">3d32286d</a></strong>
<div>
<span>by mniip</span>
<i>at 2019-08-07T10:18:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Explicitly number equations when printing axiom incompatibilities
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca8efc496db5fbfce56c19f06fc382c968907fd2">ca8efc49</a></strong>
<div>
<span>by mniip</span>
<i>at 2019-08-07T10:18:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c1b1ad7dffdde91685f310575a2aba5d211fd81">2c1b1ad7</a></strong>
<div>
<span>by mniip</span>
<i>at 2019-08-07T10:18:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix test
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e2fe57528bacf91e19857d818515b81fadbed58">8e2fe575</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2019-08-07T10:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix bug preventing information about patterns from being serialized in .hie files
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1d0e49f8a9a9175c83442430fac76ae225e52ae">f1d0e49f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-07T10:19:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add tests for #16943
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83ca42de519cdfa28b38164e90d726034dba768e">83ca42de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-07T10:19:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Make scanr a good producer and consumer"
This reverts commit 4e1dfc3767167dddd0e151a2df8305b12aa0f49c.
Due to #16943.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/818602818bb8553b241271204d159d5a40971d5a">81860281</a></strong>
<div>
<span>by Joachim Breitner</span>
<i>at 2019-08-10T14:39:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Consolidate `TablesNextToCode` and `GhcUnreigsterised` in configure (#15548)
`TablesNextToCode` is now a substituted by configure, where it has the
correct defaults and error handling. Nowhere else needs to duplicate
that, though we may want the compiler to to guard against bogus settings
files.
I renamed it from `GhcEnableTablesNextToCode` to `TablesNextToCode` to:
- Help me guard against any unfixed usages
- Remove any lingering connotation that this flag needs to be combined
with `GhcUnreigsterised`.
Original reviewers:
Original subscribers: TerrorJack, rwbarton, carter
Original Differential Revision: https://phabricator.haskell.org/D5082
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/422ffce0c65f34046fa5b4aea4f801a070bb5249">422ffce0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-10T14:40:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add timing on loadInterface
AndreasK recently mentioned that he thought that interface file loading
may be a non-trivial cost. Let's measure.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0424de2d7138763417642650a4fb09f55aa9d8d1">0424de2d</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-10T14:40:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #16893
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/672cbab268342d7a8829698e838e369e0a0b3a19">672cbab2</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-10T14:41:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reformat comments in StgSyn
This does not make any changes in the contents -- formatting only.
Previously the comments were too noisy and I've always found it very
hard to read. Hopefully it's easier to read now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/328a0efaba621b3bad6476dff1cea58bf7ab5166">328a0efa</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-08-13T17:30:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Foldable, Traversable instances for Uniq(D)FM
The `UniqDFM` is deterministic, of course, while we provide an unsafe
`NonDetUniqFM` wrapper for `UniqFM` to opt into nondeterministic instances.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b1d29c6732b9cc6e4b3b88b3c1a7943d0a9af4f2">b1d29c67</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2019-08-13T17:30:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix binary distribution</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a38104b4df092d2155f61e9785e92ceb268b7e5f">a38104b4</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-08-14T16:55:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rework the Binary Integer instance.
We used to serialise large integers as strings. Now they are serialized
as a list of Bytes.
This changes the size for a Integer in the higher 64bit range from 77 to
9 bytes when written to disk.
The impact on the general case is small (<1% for interface files) as we
don't use many Integers. But for code that uses many this should be a
nice benefit.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa4d8b07edad74c29acdcf06cf1b4c3ff6b97ffa">aa4d8b07</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-08-14T16:56:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use os.devnull instead of '/dev/null' in the testsuite driver.
The later caused issues on windows by being translated into
"\\dev\\null" and python then trying to open this non-existant file.
So we now use os.devnull inside python and convert it to "/dev/null"
when calling out to the shell, which is bound to run in a unix like
environment.
This fixes an issue a test producing unexpected stderr output failed
with a framework failure instead of showing a diff of the output.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6329c70a36242849540c93b34903f6188b0ed477">6329c70a</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-08-14T17:47:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHCi supports not-necessarily-lifted join points
Fixes #16509.
See Note [Not-necessarily-lifted join points] in ByteCodeGen,
which tells the full story.
This commit also adds some comments and cleans some code
in the byte-code generator, as I was exploring around trying
to understand it.
(This commit removes an old test -- this is really a GHCi problem,
not a pattern-synonym problem.)
test case: ghci/scripts/T16509
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca71d5514626dbfd74a3d9931c2ecbd02b5343bc">ca71d551</a></strong>
<div>
<span>by James Foster</span>
<i>at 2019-08-15T12:01:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused imports of the form 'import foo ()' (Fixes #17065)
These kinds of imports are necessary in some cases such as
importing instances of typeclasses or intentionally creating
dependencies in the build system, but '-Wunused-imports' can't
detect when they are no longer needed. This commit removes the
unused ones currently in the code base (not including test files
or submodules), with the hope that doing so may increase
parallelism in the build system by removing unnecessary
dependencies.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95837c0f573dfa22d93895d4d1ad85d6c8dcbea0">95837c0f</a></strong>
<div>
<span>by Tobias Dammers</span>
<i>at 2019-08-15T22:13:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test cases for #16615
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d076841cd5a22a43c9f19113a6fbed49de156f8">8d076841</a></strong>
<div>
<span>by Tobias Dammers</span>
<i>at 2019-08-15T22:13:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make add_info attach unfoldings (#16615)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/142088536c4e4cd71bc3e4569f58266b91ef0b98">14208853</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-08-15T22:13:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cmm: constant folding `quotRem x 2^N`
`quot` and `rem` are implemented efficiently when the second argument
is a constant power of 2. This patch uses the same implementations for
`quotRem` primop.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47e162374051ed3e874ed7916cc811df288cbd95">47e16237</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-15T22:14:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document types of LitNumbers, minor refactoring in Literal.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac73c1b13a4fef725f643e6985cdcb6f6fc1bef5">ac73c1b1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-08-18T05:16:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Faster exactLog2
Make `exactLog2` faster (use `countLeadingZeros` and Int32 bit-ops).
On my Core i7-9700k Criterion reports ~50% speedup (from 16 to 8ns).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1230d6f92440818241f3ae776fc51742c7395bb4">1230d6f9</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-18T05:17:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Typo fix in CoreToStg
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d071627932f61a20223ff0875ed96452f9e81b34">d0716279</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-08-18T05:18:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17067 by making data family type constructors actually injective
`TcTyClsDecls.tcFamDecl1` was using `NotInjective` when creating data
family type constructors, which is just plain wrong. This tweaks it
to use `Injective` instead.
Fixes #17067.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/993804bf40dea77c36f50ff772d112ec69c8a222">993804bf</a></strong>
<div>
<span>by Sam Halliday</span>
<i>at 2019-08-18T16:39:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">expose ModuleInfo.minf_rdr_env for tooling authors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b713aa3d0159f5190e197e57765195a98ce9520">5b713aa3</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-18T16:40:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix COMPACT_NFDATA closure size, more CNF sanity checking
We now do a shallow closure check on objects in compact regions.
See the new comment on why we can't do a "normal" closure check.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac7c738b19d626a827b688b6bac28c9beb28541d">ac7c738b</a></strong>
<div>
<span>by Richard Lupton</span>
<i>at 2019-08-19T02:11:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Generalized MonadUtils folds to Foldable (#16969)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a1efe1aff0c21f1d6d4150a3b05c32d79be2398">3a1efe1a</a></strong>
<div>
<span>by Richard Lupton</span>
<i>at 2019-08-19T02:12:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-export foldlM and foldrM from Data.Foldable in MonadUtils (#16969)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a394246da84c17e1b5103bde320b8ca4ce1158a">2a394246</a></strong>
<div>
<span>by Richard Lupton</span>
<i>at 2019-08-19T02:12:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Foldable instance of Bag for specialised Bag folds (#16969)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac79dfe9cb51f38e122af9a404d50aead8a9e8b0">ac79dfe9</a></strong>
<div>
<span>by Richard Lupton</span>
<i>at 2019-08-19T02:12:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Bag fold specialisations (#16969)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e40356f65bc2d62c73be8015c759899f072ac9a">5e40356f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-19T02:12:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Update bootstrap compiled used for Darwin builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d505524857e4a4901c8972afd17eb4ea346d1234">d5055248</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-22T09:25:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add Windows full build during the nightly pipeline
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a33bad2db8baccdf1d8f7c40bac7039c949c8190">a33bad2d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-08-22T09:25:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Doc: add Haddocks for quotRemWord2 primop
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/605bce26945596e9226c3f52484837a19f1d94c5">605bce26</a></strong>
<div>
<span>by James Foster</span>
<i>at 2019-08-22T18:47:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add documentation for Hadrian expressions
This commit adds documentation on Hadrian's 'Expr' type and
references the documentation in hadrian/README.md
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f32d2bc51bb4b844458125c42168dee555e173a">8f32d2bc</a></strong>
<div>
<span>by TDecki</span>
<i>at 2019-08-22T18:47:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Reintroduce fusion for scanr
While avoiding #16943.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3e26ab3bd450a2ad17cc80b41dda084558039a2">c3e26ab3</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-22T22:19:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove special case in SRT generation with -split-sections
Previously we were using an empty ModuleSRTInfo for each Cmm group with
-split-section. As far as I can see this has no benefits, and
simplifying this makes another patch simpler (!1304).
We also remove some outdated comments: we no longer generate one
module-level SRT.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8300520a714fa5e46e342e10175d237d89221c5">a8300520</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-23T12:04:15+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make non-streaming LLVM and C backends streaming
This adds a Stream.consume function, uses it in LLVM and C code
generators, and removes the use of Stream.collect function which was
used to collect streaming Cmm generation results into a list.
LLVM and C backends now properly use streamed Cmm generation, instead of
collecting Cmm groups into a list before generating LLVM/C code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47070144030d85bd510f31ab70006d055a2af151">47070144</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-08-23T19:26:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use variable length encoding for Binary instances.
Use LEB128 encoding for Int/Word variants. This reduces
the size of interface files significantly. (~19%).
Also includes a few small optimizations to make unboxing
work better that I have noticed while looking at the core.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cff44d8686c1539ee77d34756d6b7908e120b96a">cff44d86</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2019-08-23T19:27:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure.ac: fix '--disable-dwarf-debug'
Before the change
./configure --disable-dwarf-debug
enabled DWARF debugging unconditionally.
This happened due to use of 5-argument form of `AC_ARG_ENABLE`
without actually checking the passed `$enableval` parameter:
```
AC_ARG_ENABLE(dwarf-unwind,
[AC_HELP_STRING([--enable-dwarf-unwind],
[Enable DWARF unwinding support in the runtime system via elfutils' libdw [default=no]])],
[AC_CHECK_LIB(dw, dwfl_attach_state,
[UseLibdw=YES],
[AC_MSG_ERROR([Cannot find system libdw (required by --enable-dwarf-unwind)])])]
[UseLibdw=NO]
)
```
Note:
- `[UseLibdw=NO]` is called when `--{enable,disable}-dwarf-unwind`
is not passed at all as a parameter (ok).
- `[AC_CHECK_LIB(dw, dwfl_attach_state, [UseLibdw=YES],` is called
for both:
* `--enable-dwarf-unwind` being passed: `$enableval = "yes"` (ok).
* --disable-dwarf-unwind` being passed: `$enableval = "no"` (bad).
The change is to use 3-argument `AC_ARG_ENABLE` and check for passed
value as `"$enable_dwarf_unwind" = "yes"`.
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10763ce0fbf2ec88b16902cb9ba6c717bf400c13">10763ce0</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-27T10:45:02+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Some more documentation for typePrimRep1 stuff
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89487be21060bf29f4736bf2b3c89a4e74b03918">89487be2</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-27T15:21:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Some tweaks in GHC.Compact haddocks
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee2fad9e503ffdf61a086f721553aa3c502d1cb8">ee2fad9e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-08-27T15:22:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove redundant OPTIONS_GHC in BlockLayout.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c7ec4499ffec5e6b9c97e7a5c8d31062d1e2822">1c7ec449</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-28T12:51:12+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Return results of Cmm streams in backends
This generalizes code generators (outputAsm, outputLlvm, outputC, and
the call site codeOutput) so that they'll return the return values of
the passed Cmm streams.
This allows accumulating data during Cmm generation and returning it to
the call site in HscMain.
Previously the Cmm streams were assumed to return (), so the code
generators returned () as well.
This change is required by !1304 and !1530.
Skipping CI as this was tested before and I only updated the commit
message.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a308b435afed0f2416f4e5a153cafebe8d3cf3c6">a308b435</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-08-28T11:33:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17112
The `mkOneConFull` function of the pattern match checker used to try to
guess the type arguments of the data type's type constructor by looking
at the ambient type of the match. This doesn't work well for Pattern
Synonyms, where the result type isn't even necessarily a TyCon
application, and it shows in #11336 and #17112.
Also the effort seems futile; why try to try hard when the type checker
has already done the hard lifting? After this patch, we instead supply
the type constructors arguments as an argument to the function and
lean on the type-annotated AST.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/137c24e1ae26bc251d92fa8c7d47a04341f8c5ce">137c24e1</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-08-28T22:36:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Balance parentheses in GHC 8.10.1 release notes
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66282ba5d7ef0e4f7491464fc05b83e4526c9704">66282ba5</a></strong>
<div>
<span>by luca</span>
<i>at 2019-08-28T22:37:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Unused flag -ddump-shape [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf9dfe1ca32270f5e946e0f8ac1bb97184de6e4c">bf9dfe1c</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-29T04:28:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix LLVM version check yet again
There were two problems with LLVM version checking:
- The parser would only parse x and x.y formatted versions. E.g. 1.2.3
would be rejected.
- The version check was too strict and would reject x.y formatted
versions. E.g. when we support version 7 it'd reject 7.0 ("LLVM
version 7.0") and only accept 7 ("LLVM version 7").
We now parse versions with arbitrarily deep minor numbering (x.y.z.t...)
and accept versions as long as the major version matches the supported
version (e.g. 7.1, 7.1.2, 7.1.2.3 ...).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc746e98d8ee7ac22224ba7d7fd1c38e16dfad30">fc746e98</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-08-29T04:29:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix URL of Darwin's cabal-install tarball
This was inadvertently referring to the cabal-install-latest/ directory
which is volatile.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/304067a0cb01af1ce9986009065419e86788050c">304067a0</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-29T09:38:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small optimization in the SRT algorithm
Noticed by @simonmar in !1362:
If the srtEntry is Nothing, then it should be safe to omit
references to this SRT from other SRTs, even if it is a static
function.
When updating SRT map we don't omit references to static functions (see
Note [Invalid optimisation: shortcutting]), but there's no reason to add
an SRT entry for a static function if the function is not CAFFY.
(Previously we'd add SRT entries for static functions even when they're
not CAFFY)
Using 9151b99e I checked sizes of all SRTs when building GHC and
containers:
- GHC: 583736 (HEAD), 581695 (this patch). 2041 less SRT entries.
- containers: 2457 (HEAD), 2381 (this patch). 76 less SRT entries.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78afc2c92f94c7bbb94d774adc577aa039119172">78afc2c9</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2019-08-30T06:14:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure.ac: add --enable-numa switch
Before the change ./configure detected numa support automatically
withoun a nice way to disable autodetection.
The change adds `--enable-numa` / `--disable-numa` switch to
override the default. If `--enable-numa` is passed and `libnuma`
is not present then configure will fail.
Reported-by: Sergey Alirzaev
Bug: https://github.com/gentoo-haskell/gentoo-haskell/issues/955
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c0956c14f49b85326d81d2c2fa2afb2c40165721">c0956c14</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-08-30T06:15:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove HsUtils/userHsLTyVarBndrs
This patch removes 'userHsLTyVarBndrs' and 'userHsTyVarBndrs' from HsUtils.
These helper functions were not used anywhere.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e6aeb13dae82bbff1daeea18fad7b8cf0da991b">7e6aeb13</a></strong>
<div>
<span>by Eric Wolf</span>
<i>at 2019-08-31T10:25:39+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add additional step to T16804
Add another small test step
Use the same identifier name in different
scopes and see, if ':uses' handles that.
Add another test step
to check wether local bindings with the
same identifier name might get confused
Add easier to understand test output
Fix annotated lines from file correctly
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e56251f647bbb8e851bf3a3fbd9eb2ee7a0666c7">e56251f6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-08-31T17:55:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove redundant special case in STG pretty-printer
This special case existed for no reason, and made things inconsistent.
Before
Boolean.$bT :: Boolean.Boolean
[GblId, Str=m, Unf=OtherCon []] =
CAF_ccs \ u [] Boolean.$bT1;
After
Boolean.$bF :: Boolean.Boolean
[GblId, Str=m, Unf=OtherCon []] =
\u [] Boolean.$bF1;
The cost-centre is now hidden when not profiling, as is the case with
other types of closures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cfab4abeaffa8b6a78a19bbfa485169a9c772741">cfab4abe</a></strong>
<div>
<span>by Gershom Bazerman</span>
<i>at 2019-09-01T00:34:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">cap max stack size at 32 bit limit (#17019)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9acba78004d4d4a149b9e1480d1d8c44b7a27cec">9acba780</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-01T22:44:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use C99 Fixed width types to avoid hack in base's configure
Define MD5Context in terms of `uint*_t` and don't use `HsFFI.h`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11679e5bec1994775072e8e60f24b4ce104af0a7">11679e5b</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-09-02T13:17:49+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Few tweaks in -ddump-debug output, minor refactoring
- Fixes crazy indentation in -ddump-debug output
- We no longer dump empty sections in -ddump-debug when a code block
does not have any generated debug info
- Minor refactoring in Debug.hs and AsmCodeGen.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f96d57b800f10ab194897133f3c0d11e4fbc71b4">f96d57b8</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-05T18:50:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make the C-- O and C types constructors with DataKinds
The tightens up the kinds a bit. I use type synnonyms to avoid adding
promotion ticks everywhere.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b55ee979d32df938eee9c4c02c189f8be267e8a1">b55ee979</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-05T18:50:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sure all boolean settings entries use `YES` / `NO`
Some where using `True` / `False`, a legacy of when they were in
`Config.hs`. See #16914 / d238d3062a9858 for a similar problem.
Also clean up the configure variables names for consistency and clarity
while we're at it. "Target" makes clear we are talking about outputted
code, not where GHC itself runs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/821bece9e7b59272e779193d558298ba4cc7b888">821bece9</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-09-07T04:50:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactoring in deriveConstants
Mainly we now generate this
data PlatformConstants = PlatformConstants {
pc_CONTROL_GROUP_CONST_291 :: Int,
pc_STD_HDR_SIZE :: Int,
pc_PROF_HDR_SIZE :: Int,
pc_BLOCK_SIZE :: Int,
}
instead of
data PlatformConstants = PlatformConstants {
pc_platformConstants :: ()
, pc_CONTROL_GROUP_CONST_291 :: Int
, pc_STD_HDR_SIZE :: Int
, pc_PROF_HDR_SIZE :: Int
, pc_BLOCK_SIZE :: Int
...
}
The first field has no use and according to (removed) comments it was to
make code generator's work easier.. if anything this version is simpler
because it has less repetition (the commas in strings are gone).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0fdd7fe666ae61044f041233354765c4bb68529">b0fdd7fe</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-09-07T04:50:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: fix _build/ghc-stage1 to make it callable from any directory
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/51379b89eb08252560e911ab559205ea69d21fec">51379b89</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-09-08T21:40:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a new flag -dno-typeable-binds for debugging
See the user manual entry -- this helps when debugging as generated Core
gets smaller without these bindings.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0b45ac6984f245bce9de7ffcc7dad4a0046d344">d0b45ac6</a></strong>
<div>
<span>by Moritz Kiefer</span>
<i>at 2019-09-08T21:41:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GHC version guard for Int32Rep/Word32Rep
Those constructors have been added after GHC 8.8. The version guards
in `binary` are correct, see https://github.com/kolmodin/binary/pull/167/files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4cf91d1abc0232ef6b85f44dfb2bb025ab0c70b0">4cf91d1a</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-09T05:42:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use lazyness for FastString's z-encoding memoization
Having an IORef in FastString to memoize the z-encoded version is
unecessary because there is this amazing thing Haskell can do natively,
it's called "lazyness" :)
We simply remove the UNPACK and strictness annotations from the constructor
field corresponding to the z-encoding, making it lazy, and store the
(pure) z-encoded string there.
The only complication here is 'hasZEncoding' which allows cheking if a
z-encoding was computed for a given string. Since this is only used for
compiler performance statistics though it's not actually necessary to have
the current per-string granularity.
Instead I add a global IORef counter to the FastStringTable and use
unsafePerformIO to increment the counter whenever a lazy z-encoding is
forced.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f5e2fde47388fce5e23bf6f4abee0ae860a2e022">f5e2fde4</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-09T05:42:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update FastString docstrings
1) FastStrings are always UTF-8 encoded now.
2) Clarify what is meant by "hashed"
3) Add mention of lazy z-enc
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/270fbe8512f04b6107755fa22bdec62205c0a567">270fbe85</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-09-09T05:43:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace queryCygwinTerminal with Win32's isMinTTYHandle
`SysTools.Terminal.queryCygwinTerminal` now exists in the `Win32`
library under the name `isMinTTYHandle` since `Win32-2.5.0.0`.
(GHC 8.4.4 ships with `Win32-2.6.1.0`, so this is well within GHC's
support window.) We can therefore get replace `queryCygwinTerminal`
with `isMinTTYHandle` and delete quite a bit of code from
`SysTools.Terminal` in the process.
Along the way I needed to replace some uses of `#if defined x` with
`#if defined(x)` to please the CI linters.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/447864a94a1679b5b079e08bb7208a0005381cef">447864a9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-09-10T00:04:50+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: StgToCmm (#13009)
Add StgToCmm module hierarchy. Platform modules that are used in several
other places (NCG, LLVM codegen, Cmm transformations) are put into
GHC.Platform.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/60c264030f5ab8d31d42c3b6697f1f6205ca519f">60c26403</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2019-09-11T09:44:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">linker: Move -optl flags to end of linker invocation.
Until now, giving `-optl` linker flags to `ghc` on the command line placed
them in the wrong place in the `ld` command line:
They were given before all the Haskell libararies, when they should appear after.
Background:
Most linkers like `ld.bfd` and `ld.gold`, but not the newer LLVM `lld`, work in
a way where the order of `-l` flags given matters; earlier `-lmylib1` flags are
supposed to create "holes" for linker symbols that are to be filled with later
`lmylib2` flags that "fill the holes" for these symbols.
As discovered in
https://github.com/haskell/cabal/pull/5451#issuecomment-518001240,
the `-optl` flags appeared before e.g. the
-lHStext-1.2.3.1
-lHSbinary-0.8.6.0
-lHScontainers-0.6.0.1
flags that GHC added at the very end.
Haskell libraries typically depend on C libraries, so `-lHS*` flags will create
holes for the C libraries to fill in, but that only works when those libraries'
`-l` flags are given **after** the `-lHS*` flags; until now they were given
before, which was wrong.
This meant that Cabal's `--ld-options` flag and `ld-options` `.cabal` file field
were pretty ineffective, unless you used the `--ld-option=--start-group` hack as
(https://github.com/haskell/cabal/pull/5451#issuecomment-406761676) that
convinces the classical linkers to not be dependent on the order of linker flags
given.
This commit fixes the problem by simply flipping the order, putting `-optl`
flags at the end, after Haskell libraries.
The code change is effectively only `args1 ++ args` -> `args ++ args1`
but the commit also renames the variables for improved clarity.
Simple way to test it:
ghc --make Main.hs -fforce-recomp -v -optl-s
on a `Main.hs` like:
import qualified Data.Set as Set
main = print $ Set.fromList "hello"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7032a91362766c0aa7a9bdd28a3506897f40cf66">7032a913</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-11T09:45:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove COMPILING_GHC
It is no longer used. I guess we are sharing fewer headers with the RTS
than the comment claims. That's a relief!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58569a5b40e060066ad10df81ed77a6f77f23d9f">58569a5b</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2019-09-11T09:45:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: check for RTS linker
Fixes #16833
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df6fbe035fc08332007db443d3a3f0e8c6cf75a7">df6fbe03</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2019-09-11T09:46:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Hadrian's QuickCheck dependency
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d9e637dfb3a0c29b235a99363e4eb6b255aa781a">d9e637df</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-11T09:47:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead `ncgDebugIsOn` and `NCG_DEBUG`
Haven't been used since 16206a6603e87e15d61c57456267c5f7ba68050e.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ef6fe8f70156581ce8e370a90975fb96f98783a">7ef6fe8f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-11T09:48:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SetLevels: Fix potential panic in lvlBind
3b31a94d introduced a use of isUnliftedType which can panic in the case
of levity-polymorphic types. Fix this by introducing mightBeUnliftedType
which returns whether the type is *guaranteed* to be lifted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c76cc0c6fa973ae8e083db5aeb4d19f37a64bb21">c76cc0c6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-09-11T19:40:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor bad coercion checking in a few places
We do bad coercion checking in a few places in the compiler, but they
all checked it differently:
- CoreToStg.coreToStgArgs:
Disallowed lifted-to-unlifted, disallowed changing prim reps even when
the sizes are the same.
- StgCmmExpr.cgCase:
Checked primRepSlot equality. This disallowed Int to Int64 coercions
on 64-bit systems (and Int to Int32 on 32-bit) even though those are
fine.
- CoreLint:
Only place where we do this right. Full rules are explained in Note
[Bad unsafe coercion].
This patch implements the check explained in Note [Bad unsafe coercion]
in CoreLint and uses it in CoreToStg.coreToStgArgs and
StgCmmExpr.cgCase.
This fixes #16952 and unblocks !1381 (which fixes #16893).
This is the most conservative and correct change I came up with that
fixes #16952.
One remaining problem with coercion checking is that it's currently done
in seemingly random places. What's special about CoreToStg.coreToStgArgs
and StgCmmExpr.cgCase? My guess is that adding assertions to those
places caught bugs before so we left assertions in those places. I think
we should remove these assertions and do coercion checking in CoreLint
and StgLint only (#17041).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a7d3923aa9be94b9c01c2d2d4408587eb4a8400">3a7d3923</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2019-09-11T19:40:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Windows: make openTempFile fully atomic.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/98b0d6eeff5711e0872abd2ef2d1ee0269b662cf">98b0d6ee</a></strong>
<div>
<span>by Pranay Sashank</span>
<i>at 2019-09-12T04:52:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Print the correct system memory in use with +RTS -s (#17158)
Use `stats.max_mem_in_use_bytes` to print the memory usage instead of
`stats.max_live_bytes` which prints maximum residency.
Fixes (#17158).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a06629b457f02256ffa73a42a24df6499433a42d">a06629b4</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-12T04:53:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not throw away backpack instantiations for module lookup cache
Currently, there is only one home package so this probably doesn't
matter. But if we support multiple home packages, they could differ only
in arguments (same indef component being applied).
It looks like it used to be this way before
4e8a0607140b23561248a41aeaf837224aa6315b, but that commit doesn't seem
to comment on this change in the particular. (It's main purpose is
creating the InstalledUnitId and recategorizing the UnitId expressions
accordingly.)
Trying this as a separate commit for testing purposes. I leave it to
others to decide whether this is a good change on its own.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09fa56540aca53c32b6f008a3af2d61c70e1b47d">09fa5654</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-12T04:53:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused `#include`s from parser/cutils.c
Looks like these have been unused since
7c665f9ce0980ee7c81a44c8f861686395637453.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b37a79d61e9b3787873dc9f7458ef2bde4809b0">2b37a79d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-12T14:05:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal submodule to 3.1
-------------------------
Metric Increase:
haddock.Cabal
T4029
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/867534750bcf66f6243f0b7d2d9ec11fa1defd04">86753475</a></strong>
<div>
<span>by Ningning Xie</span>
<i>at 2019-09-12T14:06:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix StandaloneDeriving
If I understand correctly, `deriving instance _ => Eq (Foo a)`
is equivalent to `data Foo a deriving Eq`, rather than
`data Foo a deriving Foo`.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a733002a53d0903180f7bba9ecbb499e1afa60e0">a733002a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-13T03:09:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update mailmap
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b64aee2336c4f7a125c26b5b7a9d9e7a12899ec">5b64aee2</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-09-13T03:10:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix scoping of implicit parameters
There was an outright bug in TcInteract.solveOneFromTheOther
which meant that we did not always pick the innermost
implicit parameter binding, causing #17104.
The fix is easy, just a rearrangement of conditional tests
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47b126608938bb849565df70a404c0f3b3d61c65">47b12660</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2019-09-13T03:11:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Windows: Fix hsc2hs non-deterministic failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3a7592bf81a6fc5854c3605d50cb53282e4bfbf">e3a7592b</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-09-13T03:11:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a test to make sure we don't regress on #17140 in the future
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f3cd50e2cee39480c1b1df7298e69164c3a83d5">6f3cd50e</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2019-09-13T11:24:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Explain how to update HieAst [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71428a43bf122a24650af1fdf84a64543f267b8b">71428a43</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2019-09-13T11:24:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Address review comments [skip CI]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ccb4e646e0bd18d2664aeb1163ab2852b0844f2c">ccb4e646</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-13T11:25:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Compiler should always get fingerprinting impl from base
07ee15915d5a0d6d1aeee137541eec6e9c153e65 started the transition, but the
job was never finished.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c45c89d634d227476c5ef95f9ce9c4f3c8172d19">c45c89d6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-13T11:26:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab: Add issue template for documentation issues
Fixes #17180.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0e220b77957738b9966a099b5616017ab7b05b6">a0e220b7</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-13T11:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove empty NCG.h
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/046ca13356813af0817a7b3744315d012832fe2e">046ca133</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-09-13T15:43:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add predicates for testing if IOError is ResourceVanished.
This adds isResourceVanished, resourceVanishedErrorType, and
isResourceVanishedErrorType to System.IO.Error, resolving #14730.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd079345f633e01e8d4ff76aef39cb2aa50af6a9">bd079345</a></strong>
<div>
<span>by taylorfausak</span>
<i>at 2019-09-14T06:25:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix CONLIKE typo</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf7e78a3aef35741d6d296d844b99ec2529c42a3">cf7e78a3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-15T23:46:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.StgToCmm.Con -> GHC.StgToCmm.DataCon
Incredibly, Windows disallows the manipulation of any file matching
Con(\..*)?. The `GHC.StgToCmm.Con` was introduced in the renamings in
447864a9, breaking the Windows build. Work around this by renaming it to
`GHC.StgToCmm.DataCon`
Fixes #17187.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7208160d2caae125479e8dd39a263620ea7e0ffe">7208160d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-09-15T23:47:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Hadrian build with Stack (#17189)
Broken by 2b37a79d61e9b3787873dc9f7458ef2bde4809b0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5ae3868db62228e7a75a9f1f66a9b05a4cf3277">b5ae3868</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-09-16T13:32:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow validation with Hadrian built with Stack [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7915afc6bb9539a4534db99aeb6616a6d145918a">7915afc6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-16T13:33:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Encode shape information in `PmOracle`
Previously, we had an elaborate mechanism for selecting the warnings to
generate in the presence of different `COMPLETE` matching groups that,
albeit finely-tuned, produced wrong results from an end user's
perspective in some cases (#13363).
The underlying issue is that at the point where the `ConVar` case has to
commit to a particular `COMPLETE` group, there's not enough information
to do so and the status quo was to just enumerate all possible complete
sets nondeterministically. The `getResult` function would then pick the
outcome according to metrics defined in accordance to the user's guide.
But crucially, it lacked knowledge about the order in which affected
clauses appear, leading to the surprising behavior in #13363.
In !1010 we taught the term oracle to reason about literal values a
variable can certainly not take on. This MR extends that idea to
`ConLike`s and thereby fixes #13363: Instead of committing to a
particular `COMPLETE` group in the `ConVar` case, we now split off the
matching constructor incrementally and record the newly covered case as
a refutable shape in the oracle. Whenever the set of refutable shapes
covers any `COMPLETE` set, the oracle recognises vacuosity of the
uncovered set.
This patch goes a step further: Since at this point the information
in value abstractions is merely a cut down representation of what the
oracle knows, value abstractions degenerate to a single `Id`, the
semantics of which is determined by the oracle state `Delta`.
Value vectors become lists of `[Id]` given meaning to by a single
`Delta`, value set abstractions (of which the uncovered set is an
instance) correspond to a union of `Delta`s which instantiate the
same `[Id]` (akin to models of formula).
Fixes #11528 #13021, #13363, #13965, #14059, #14253, #14851, #15753, #17096, #17149
-------------------------
Metric Decrease:
ManyAlternatives
T11195
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae4415b9487d24942aa0e91052d4b897a3cf2f2e">ae4415b9</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-09-17T19:21:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">eventlog: Add biographical and retainer profiling traces
This patch adds a new eventlog event which indicates the start of
a biographical profiler sample. These are different to normal events as
they also include the timestamp of when the census took place. This is
because the LDV profiler only emits samples at the end of the run.
Now all the different profiling modes emit consumable events to the
eventlog.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c21b2fd041f19ad02f1c1d530a3f9cbf092c622">9c21b2fd</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-09-17T19:22:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #13571 by adding an extension flag check
Test case: indexed-types/should_fail/T13571
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8039b12546c80610e3a88c9fe59a0efe9c994515">8039b125</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-09-17T19:22:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c3af277582be677a11b1f292acb8c88ca3368b1">1c3af277</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-09-17T19:23:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve error message for out-of-scope variables + VTA
As #13834 and #17150 report, we get a TERRIBLE error message when you
have an out of scope variable applied in a visible type application:
(outOfScope @Int True)
This very simple patch improves matters.
See TcExpr Note [VTA for out-of-scope functions]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c77fc3b20e93ba3215791d8d087a096853c4dd67">c77fc3b2</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-17T19:24:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deduplicate `HaskellMachRegs.h` and `RtsMachRegs.h` headers
Until 0472f0f6a92395d478e9644c0dbd12948518099f there was a meaningful
host vs target distinction (though it wasn't used right, in genapply).
After that, they did not differ in meaningful ways, so it's best to just
only keep one.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3eaaca63c81b3164e35b65d7b508bf2e8cb5fc6">c3eaaca6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-09-19T09:03:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a missing update of sc_hole_ty (#16312)
In simplCast I totally failed to keep the sc_hole_ty field of
ApplyToTy (see Note [The hole type in ApplyToTy]) up to date.
When a cast goes by, of course the hole type changes.
Amazingly this has not bitten us before, but #16312 finally
triggered it. Fortunately the fix is simple.
Fixes #16312.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de1723b260a60bcecc4271c5ac3c60b590bf257f">de1723b2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-19T09:03:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify: Lazy pattern match
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d9c6b86e922ef786411b852bd247ef5573ee7a59">d9c6b86e</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-09-19T09:04:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor kindGeneralize and friends
This commit should have no change in behavior.(*)
The observation was that Note [Recipe for checking a signature]
says that every metavariable in a type-checked type must either
(A) be generalized
(B) be promoted
(C) be zapped.
Yet the code paths for doing these were all somewhat separate.
This led to some steps being skipped. This commit shores this
all up. The key innovation is TcHsType.kindGeneralizeSome, with
appropriate commentary.
This commit also sets the stage for #15809, by turning the
WARNing about bad level-numbers in generalisation into an
ASSERTion. The actual fix for #15809 will be in a separate
commit.
Other changes:
* zonkPromoteType is now replaced by kindGeneralizeNone.
This might have a small performance degradation, because
zonkPromoteType zonked and promoted all at once. The new
code path promotes first, and then zonks.
* A call to kindGeneralizeNone was added in tcHsPartialSigType.
I think this was a lurking bug, because it did not follow
Note [Recipe for checking a signature]. I did not try to
come up with an example showing the bug. This is the (*)
above.
Because of this change, there is an error message regression
in partial-sigs/should_fail/T14040a. This problem isn't really
a direct result of this refactoring, but is a symptom of
something deeper. See #16775, which addresses the deeper
problem.
* I added a short-cut to quantifyTyVars, in case there's
nothing to quantify.
* There was a horribly-outdated Note that wasn't referred
to. Gone now.
* While poking around with T14040a, I discovered a small
mistake in the Coercion.simplifyArgsWorker. Easy to fix,
happily.
* See new Note [Free vars in coercion hole] in TcMType.
Previously, we were doing the wrong thing when looking
at a coercion hole in the gather-candidates algorithm.
Fixed now, with lengthy explanation.
Metric Decrease:
T14683
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f594a68a5500696d94ae36425bbf4d4073aca3b2">f594a68a</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-09-19T09:04:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use level numbers for generalisation
This fixes #15809, and is covered in
Note [Use level numbers for quantification] in TcMType.
This patch removes the "global tyvars" from the
environment, a nice little win.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c675d08fb08151c10e94a975452ce0c5c2cf997a">c675d08f</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-09-19T09:04:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Test #17077.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/912afaf49e86501657468f32c1fd20961f98a6d1">912afaf4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-19T09:04:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CoreUtils: Use mightBeUnliftedType in exprIsTopLevelBindable
Also add reference from isUnliftedType to mightBeUnliftedType.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/baf47661426e6f60c5fbfd2fb29cb446aa007576">baf47661</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-19T09:05:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Extract PmTypes module from PmExpr and PmOracle
Apparently ghc-lib-parser's API blew up because the newly induced cyclic
dependency between TcRnTypes and PmOracle pulled in the other half of
GHC into the relevant strongly-connected component.
This patch arranges it so that PmTypes exposes mostly data type
definitions and type class instances to be used within PmOracle, without
importing the any of the possibly offending modules DsMonad, TcSimplify
and FamInst.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a8867cfa6b6aa3f8b35a9506f4058bb5d37f7dc">2a8867cf</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-19T09:05:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a regression test for #11822
The particular test is already fixed, but the issue seems to have
multiple different test cases lumped together.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/521739900fe993ff73ec0da2215bc7572a15826d">52173990</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-19T09:06:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add testcase for #17206
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3e5c73119e5c3bf801885e56cababa446434211">b3e5c731</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-09-19T21:42:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ErrUtils: split withTiming into withTiming and withTimingSilent
'withTiming' becomes a function that, when passed '-vN' (N >= 2) or
'-ddump-timings', will print timing (and possibly allocations) related
information. When additionally built with '-eventlog' and executed with
'+RTS -l', 'withTiming' will also emit both 'traceMarker' and 'traceEvent'
events to the eventlog.
'withTimingSilent' on the other hand will never print any timing information,
under any circumstance, and will only emit 'traceEvent' events to the eventlog.
As pointed out in !1672, 'traceMarker' is better suited for things that we
might want to visualize in tools like eventlog2html, while 'traceEvent'
is better suited for internal events that occur a lot more often and that we
don't necessarily want to visualize.
This addresses #17138 by using 'withTimingSilent' for all the codegen bits
that are expressed as a bunch of small computations over streams of codegen
ASTs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4853d962289db1b32886ec73e824cd37c9c5c002">4853d962</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-19T21:42:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Fix link to let generalization blog post
Fixes #17200.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5119296440e6846c553c72b8a93afc5ecfa576f0">51192964</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-09-20T05:14:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: Hs (#13009)
Add GHC.Hs module hierarchy replacing hsSyn.
Metric Increase:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f8ce45a6f874519cf5a908a7eb0d9633a2389f9">2f8ce45a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-20T05:15:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17202
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f257bf735c1c4b7d60f954795c8398a7c51b8cc9">f257bf73</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-09-20T05:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/ghci.sh: Enable building in parallel
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/070f7b852a2662e8b5058c2fb40ef1c5a25c86d7">070f7b85</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-09-20T05:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove trailing whitespace
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5390b5537b81f47add68c135a3743f1a17c428b3">5390b553</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-09-20T05:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass -j to ghc-in-ghci CI job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b7e1d31fee4176608e46d45ddc195e313eed978">1b7e1d31</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-20T05:16:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove pointless partiality in `Parser.ajs`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1755424806839d57a0c5672922a4b65b838f7d17">17554248</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-09-20T10:50:21+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix PmOracle.addVarCoreCt in-scope set
PmOracle.addVarCoreCt was giving a bogus (empty) in-scope set to
exprIsConApp_maybe, which resulted in a substitution-invariant
failure (see MR !1647 discussion).
This patch fixes it, by taking the free vars of the expression.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dad81ca5fd1f63bf8a3b6ad09787559e8bd05c0">0dad81ca</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-09-20T10:50:21+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix bogus type of case expression
Issue #17056 revealed that we were sometimes building a case
expression whose type field (in the Case constructor) was bogus.
Consider a phantom type synonym
type S a = Int
and we want to form the case expression
case x of K (a::*) -> (e :: S a)
We must not make the type field of the Case constructor be (S a)
because 'a' isn't in scope. We must instead expand the synonym.
Changes in this patch:
* Expand synonyms in the new function CoreUtils.mkSingleAltCase.
* Use mkSingleAltCase in MkCore.wrapFloat, which was the proximate
source of the bug (when called by exprIsConApp_maybe)
* Use mkSingleAltCase elsewhere
* Documentation
CoreSyn new invariant (6) in Note [Case expression invariants]
CoreSyn Note [Why does Case have a 'Type' field?]
CoreUtils Note [Care with the type of a case expression]
* I improved Core Lint's error reporting, which was pretty
confusing in this case, because it didn't mention that the offending
type was the return type of a case expression.
* A little bit of cosmetic refactoring in CoreUtils
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1ea8c451375be9829df22e87213137e71c9c05ac">1ea8c451</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-21T09:52:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PredType for type constraints in the pattern match checker instead of EvVar
Using EvVars for capturing type constraints implied side-effects in DsM
when we just wanted to *construct* type constraints.
But giving names to type constraints is only necessary when passing
Givens to the type checker, of which the majority of the pattern match
checker should be unaware.
Thus, we simply generate `newtype TyCt = TyCt PredType`, which are
nicely stateless. But at the same time this means we have to allocate
EvVars when we want to query the type oracle! So we keep the type oracle
state as `newtype TyState = TySt (Bag EvVar)`, which nicely makes a
distinction between new, unchecked `TyCt`s and the inert set in
`TyState`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ded96fb3ad540e0145483574b4a09bdcbe964c88">ded96fb3</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-09-21T09:53:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document MIN_PAYLOAD_SIZE and mark-compact GC mark bits
This updates the documentation of the MIN_PAYLOAD_SIZE constant and adds
a new Note [Mark bits in mark-compact collector] explaning why the
mark-compact collector uses two bits per objet and why we need
MIN_PAYLOAD_SIZE.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7867c7949b9dad95216ad5f2946be2cafcb860c">a7867c79</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-21T14:56:58+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Get rid of PmFake
The pattern match oracle can now cope with the abundance of information
that ViewPatterns, NPlusKPats, overloaded lists, etc. provide.
No need to have PmFake anymore!
Also got rid of a spurious call to `allCompleteMatches`, which we used to call
*for every constructor* match. Naturally this blows up quadratically for
programs like `ManyAlternatives`.
-------------------------
Metric Decrease:
ManyAlternatives
Metric Increase:
T11822
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa66e3e5a3a34d1b84c4883d374644079e2ed61f">fa66e3e5</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-09-21T23:31:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix haddocks for marker events in Debug.Trace</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da12da7945ae59d5132506829612e57db58bbf83">da12da79</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T14:34:56+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Remove cStackSize debug counter
This can only ever be one since 5f1d949ab9 ("Remove explicit recursion in
retainer profiling"), so it's pointless.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ebaa4b5909176e7924f063f58e4de73c7809b0a">3ebaa4b5</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:17:53+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Remove bitrotten retainer debug code
The `defined(DEBUG_RETAINER) == true` branch doesn't even compile anymore
because 1) retainerSet was renamed to RetainerSet and 2) even if I fix that
the context in Rts.h seems to have changed such that it's not in scope. If
3) I fix that 'flip' is still not in scope :) At that point I just gave up.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63023dc26100b0fee46281890518fa5eab2ddc59">63023dc2</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:09+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix outdated references to 'ldvTime'
This got renamed to 'era' in dbef766ce7 ("[project @ 2001-11-26 16:54:21 by
simonmar] Profiling cleanup").
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ead05f8045403e997c88c784b409d03c1fd0aee1">ead05f80</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:09+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Turn global traversal state into a struct
Global state is ugly and hard to test. Since the profiling code isn't quite
as performance critical as, say, GC we should prefer better code here.
I would like to move the 'flip' bit into the struct too but that's
complicated by the fact that the defines which use it directly are also
called from ProfHeap where the traversalState is not easily
available. Maybe in a future commit.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/94ecdb4f24b6a66d09d0f7afc0b9728678bb7143">94ecdb4f</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Move info.next.parent to stackElement
I don't see a point in having this live in 'info', just seems to make the
code more complicated.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f79ac2efb548c3e67610299592731704a08b8796">f79ac2ef</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Generalise per-stackElement data
This essentially ammounts to s/retainer/stackData/, s/c_child_r/data/ and
some temporary casting of c_child_r to stackData until refactoring of this
module is completed by a subsequent commit. We also introduce a new union
'stackData' which will contain the actual extra data to be stored on the
stack.
The idea is to make the heap traversal logic of the retainer profiler ready
for extraction into it's own module. So talking about "retainers" there
doesn't really make sense anymore.
Essentially the "retainers" we store in the stack are just data associated
with the push()ed closures which we return when pop()ing it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f083358b177fad4d5f0325d3cc099eeed64e7f54">f083358b</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Fix comment typo s/keeps/keep/
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f2f6dd5b708eae4888782ca3eb555152b64ee90">2f2f6dd5</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Generalise profiling heap traversal flip bit handling
This commit starts renaming some flip bit related functions for the
generalised heap traversal code and adds provitions for sharing the
per-closure profiling header field currently used exclusively for retainer
profiling with other heap traversal profiling modes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e40b3c2300db42a57ce02fe36ce57af8c9625409">e40b3c23</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: GC: Remove redundant #include "RetainerProfiler.h"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b03db9da54beded54d97e30453346efeeb36cb06">b03db9da</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Pull retainer specific code into a callback
This essentially turns the heap traversal code into a visitor. You add a
bunch of roots to the work-stack and then the callback you give to
traverseWorkStack() will be called with every reachable closure at least
once.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/48e816f0d754120029ab65b90f3ff42827a8e907">48e816f0</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: simplify pop() control flow
Instead of breaking out of the switch-in-while construct using `return` this
uses `goto out` which makes it possible to share a lot of the out-variable
assignment code in all the cases.
I also replaced the nasty `while(true)` business by the real loop
condition: `while(*c == NULL)`. All `break` calls inside the switch aready
have either a check for NULL or an assignment of `c` to NULL so this should
not change any behaviour.
Using `goto out` also allowed me to remove another minor wart: In the
MVAR_*/WEAK cases the popOff() call used to happen before reading the
stackElement. This looked like a use-after-free hazard to me as the stack
is allocated in blocks and depletion of a block could mean it getting freed
and possibly overwritten by zero or garbage, depending on the block
allocator's behaviour.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b92ed68a7c452685e21debec947b11520e70f8da">b92ed68a</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add note reference to SET_PROF_HDR for profiling 'flip' bit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3bb73973284b6d60795b63049af5716ab081b34">f3bb7397</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: RetainerSet: Remove obsolete fist/second-approach choice
In the old code when DEBUG_RETAINER was set, FIRST_APPROACH is
implied. However ProfHeap.c now depends on printRetainerSetShort which is
only available with SECOND_APPROACH. This is because with FIRST_APPROACH
retainerProfile() will free all retainer sets before returning so by the
time ProfHeap calls dumpCensus the retainer set pointers are segfaulty.
Since all of this debugging code obviously hasn't been compiled in ages
anyways I'm taking the liberty of just removing it.
Remember guys: Dead code is a liability not an asset :)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ec1d76e29d517e9c3c37e0a481f0cbac79687776">ec1d76e2</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Remove obsolete debug code
Commit dbef766ce7 ("Profiling cleanup.") made this debug code obsolete by
removing the 'cost' function without a replacement. As best I can tell the
retainer profiler used to do some heap census too and this debug code was
mainly concerned with that.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7e15d17a48286548f26f93594fb1b0b700dd422">b7e15d17</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Rename heap traversal functions for extraction
This gets all remaining functions in-line with the new 'traverse' prefix
and module name.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64ec45a798f9b335ab9ba8cb2c7bb9ae0f056ba1">64ec45a7</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Reduce DEBUG_RETAINER ifdef noise
Keeping track of the maximum stack seems like a good idea in all
configurations. The associated ASSERTs only materialize in debug mode but
having the statistic is nice.
To make the debug code less prone to bitrotting I introduce a function
'debug()' which doesn't actually print by default and is #define'd away
only when the standard DEBUG define is off.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd78b6965c7077b0efe7a27ec591b8a954cbe1e6">bd78b696</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Cleanup comments and strings for traversal extraction
A lot of comments and strings are still talking about old names, fix
that.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb7220b36cc34fe5e0545ab66ffb760363a244b1">cb7220b3</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Remove outdated invariants on traversePushStack
These invariants don't seem to make any sense in the current code. The
text talks about c_child_r as if it were an StgClosure, for which RSET()
would make sense, but it's a retainer aka 'CostCentreStack*'.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb92660c9d9c226f7ec068dd54d235c5cd4f6d84">bb92660c</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Use global STATIC_INLINE macro
STATIC_INLINE already does what the code wanted here, no need to duplicate
the functionality here.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b76cf9e163a4fb9400b4ee5c2f8d1b27e94632c">2b76cf9e</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Move heap traversal declarations to new header
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44d5cc0dc456a138bb7976c17d07e5d41873051a">44d5cc0d</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Abstract maxStackSize for generic traversal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd213d177cc9f3818babccf8df623e23dc10799e">fd213d17</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Update obsolete docs for traverseMaybeInitClosureData
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39f2878c587927c5bb69f7ab26b5d09fb3cf2cc4">39f2878c</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Move actual 'flip' bit flip to generic traversal code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9b4c4f2f66d88c5c962e7f85c4ae675b959551e">f9b4c4f2</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Remove traverse-stack chunk support
There's simply no need anymore for this whole business. Instead of
individually traversing roots in retainRoot() we just push them all onto
the stack and traverse everything in one go.
This feature was not really used anyways. There is an
`ASSERT(isEmptyWorkStack(ts))` at the top of retainRoot() which means there
really can't ever have been any chunks at the toplevel.
The only place where this was probably used is in traversePushStack but
only way back when we were still using explicit recursion on the
C callstack.
Since the code was changed to use an explicit traversal-stack these
stack-chunks can never escape one call to traversePushStack anymore. See
commit 5f1d949ab9 ("Remove explicit recursion in retainer profiling")
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7def600c24d7f42d43e2bed1b6b3b0ad21d4471">c7def600</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Move mut_list reset to generic traversal code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9bf27060b1dd919f489a70457052689b5d7a195a">9bf27060</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Make visit callback easier to implement
Currently it is necessary for user code to expend at least one extra bit in
the closure header just to know whether visit() should return true or
false, to indicate if children should be traversed.
The generic traversal code already has this information in the visited bit
so simply pass it to the visit callback.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96adf1798527e1974a5daa196b50ef2840106c3c">96adf179</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: retainer: Improve Note [Profiling heap traversal visited bit]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/187192a61a57bdb461b655931618aee80f0928a9">187192a6</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: RetainerProfile.c: Re-enable and fix warnings
Turns out some genius disabled warnings for RetainerProfile.c in the build
system. That would have been good to know about five silent type mismatch
crashes ago.. :)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb29735e321e244c161a40cceadd41fcab820f84">eb29735e</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: RetainerProfile.c: Minimize #includes
A lot of these includes are presumably leftovers from when the retainer
profiler still did it's own heap profiling.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/383f9089eea7f9228513260ad0f7215938cd4b31">383f9089</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Split heap traversal from retainer profiler
This finally moves the newly generalised heap traversal code from the
retainer profiler into it's own file.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/52c5ea71515df9fa655de8c94ec75510f417362e">52c5ea71</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: TraverseHeap: Make comment style consistent
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/753552285ee6f988f8a8f6729d09a4d7b228490c">75355228</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: TraverseHeap: Make pushStackElement argument const
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a813778062652584e38d2ed52a9bdeda83758247">a8137780</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: TraverseHeap: Move stackElement.cp back into nextPos union
The 'cp' field really is only used when type==posTypeFresh so it's more
space efficient to have it in the nextPos union.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f10cc2ddb32ab363b7131ec0450536908af701a">7f10cc2d</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:18:10+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: RetainerProfile: Explain retainVisitClosure return values
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/111f27613d100ac6f4cddecd5a393456d8a2e3a5">111f2761</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-22T15:33:41+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: TraverseHeap: Add doc comment for getTraverseStackMaxSize
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68ddb43c44065d0d3a8a6893f7f8e87f15ee9c1e">68ddb43c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-23T00:34:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix URL of Windows cabal-install tarball
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e478407f3aa03425011f6ab5081d39eeca7df05">0e478407</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-09-23T17:51:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix links and formats for GHC 8.10
This commit only fixes links and markdown syntax.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74631bbcc9cd7926d75e3cd0ed2b8d766de2868c">74631bbc</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2019-09-23T17:52:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: add newtypes for socklen_t and ndfs_t to System.Posix.Types #16568
Metric Increase:
haddock.base
T4029
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4470a144d03e331656002f6ad70fd6a8d78d25bf">4470a144</a></strong>
<div>
<span>by Björn Gohla</span>
<i>at 2019-09-23T17:53:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add Hadrian rule to build user guide as Info book
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dbbea5a84df16ac60b563ac31496139263875eaf">dbbea5a8</a></strong>
<div>
<span>by Björn Gohla</span>
<i>at 2019-09-23T17:53:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">use the Make builder instead of raw cmd_
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0e3b173566e04eeee9241a700ffb3998d13a72c">b0e3b173</a></strong>
<div>
<span>by Björn Gohla</span>
<i>at 2019-09-23T17:53:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">detect makeinfo in configure(.ac)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9fe4d2df9f728f6bc799001b47c861619a90db11">9fe4d2df</a></strong>
<div>
<span>by Björn Gohla</span>
<i>at 2019-09-23T17:53:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">explicit dependence on makeinfo
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b650c2b6dc9b43c7adc116236fd6588303df807b">b650c2b6</a></strong>
<div>
<span>by Björn Gohla</span>
<i>at 2019-09-23T17:53:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">alphabetical ordering
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2778929466dafefd55a0673625f4520a234df986">27789294</a></strong>
<div>
<span>by Björn Gohla</span>
<i>at 2019-09-23T17:53:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">sort-paragraphs in runBuilderWith
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0c2f3a2b6ec2d3ee2b9f017eb52c72cf6187d6f">d0c2f3a2</a></strong>
<div>
<span>by Artem Pyanykh</span>
<i>at 2019-09-23T17:54:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[hadrian] Rebuild programs on dynamicGhcPrograms/ghcProfiled change
Currently, if you change these ^ flavour parameters, rebuilding is not
triggered, since `programContext` doesn't set up a dependency on
those values.
Exposing these values via an oracle does set the dependency and
properly triggers a rebuild of binaries.
Several attempts to factor out these actions ended up in cyclic
dependency here or there. I'm not absolutely happy with this variant
either, but at least it works.
====
Issue repro:
In UserSettings.hs:
```
dbgDynamic = defaultFlavour { name = "dbg-dynamic"
, dynamicGhcPrograms = pure True,
... }
dbgStatic = defaultFlavour { name = "dbg-static"
, dynamicGhcPrograms = pure False
... }
```
Then in console:
```
$ hadrian/build.sh -j --flavour=dbg-dynamic
... does the build
$ hadrian/build.sh -j --flavour=dbg-static
... does nothing, considers binaries up to date
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/238b58e436a24fcb76846f24b37c90b873ef2bef">238b58e4</a></strong>
<div>
<span>by Kari Pahula</span>
<i>at 2019-09-23T17:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -fkeep-going to make compiler continue despite errors (#15424)
Add a new optional failure handling for upsweep which continues
the compilation on other modules if any of them has errors.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/146f26cc984240cea8c86ba4a82ab7b50230b2a3">146f26cc</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-24T01:06:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Some leftovers from !1732. Comments only [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5f24fb473560cc533143846329666896e9861be">b5f24fb4</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-09-24T01:07:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Add -haddock option for GHCi's :doc command
This commit adds -haddock option to Hadrian-based build system.
To enable :doc command on GHCi, core libraries must be compiled
with -haddock option.
Especially, the `-haddock` option is essential for a release build.
Assuming current GitLab CI condition (.gitlab-ci.yml),
I add -haddock option to the default flavour only.
This has already been done for Make-based build system.
Please see #16415.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f97a7aacb5ff2c7a53f5e08e9d75edbb67e13cf8">f97a7aac</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-24T01:07:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix some duplication in the parser
D3673 experienced reduce/reduce conflicts when trying to use
opt_instance for associated data families.
That was probably because the author tried to use it for
Haskell98-syntax without also applying it to GADT-syntax, which actually
leads to a reduce/reduce conflict. Consider the following state:
```
data . T = T
data . T where T :: T
```
The parser must decide at this point whether or not to reduce an empty
`opt_instance`. But doing so would also commit to either
Haskell98 or GADT syntax! Good thing we also accept an optional
"instance" for GADT syntax, so the `opt_instance` is there in both
productions and there's no reduce/reduce conflict anymore.
Also no need to inline `opt_instance`, how it used to be.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b23f01fda74458a4d73161d3dc0b074abc650a93">b23f01fd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-24T08:49:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Add link to "A reflection on types"
Fixes #17181.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bbe0dba72130436780eb81f36248525ffdccd3f">4bbe0dba</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-24T08:50:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump ci-images
This bumps the CI Docker images to
ghc/ci-images@990c5217d1d0e03aea415f951afbc3b1a89240c6.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6bca867c52f8ced2258c90c8344a9286aafed2f6">6bca867c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-24T08:50:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Update source-repository</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2d475362b0a3d4bc8411835494a6899a8b40f4c">b2d47536</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-24T08:51:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark threadstatus-9333 as fragile in profthreaded
Due to #16555.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed520678404ade3b5886be3f3c41a4bf41cf231d">ed520678</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-09-24T21:08:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix bounds check in ocResolve_PEi386 for relocation values.
The old test was wrong at least for gcc and the value -2287728808L.
It also relied on implementation defined behaviour (right shift
on a negative value), which might or might not be ok.
Either way it's now a simple comparison which will always work.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/218c5dbfbd60a416588e1b952c167ebd18ef9c56">218c5dbf</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-09-24T21:09:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add ghcide configuration files
This commit adds three new files
1. A hie.yaml file to the project root which specifies to IDEs how to
set up the correct environment for loading GHC. This currently
specifies to call the `./hadrian/hie-bios` script.
2. A `hie.yaml` file for the hadrian subcomponent, which uses the
`cabal` cradle type.
2. The `./hadrian/hie-bios` script which supplies the correct arguments
for an IDE to start a session.
With these two files it is possible to run
```
ghcide compiler/
```
and successfully load all the modules for use in the IDE.
or
```
ghcide --cwd hadrian/ src/
```
to test loading all of Hadrian's modules.
Closes #17194
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2970dc7ab95f7daa793112c6a4a682263561761c">2970dc7a</a></strong>
<div>
<span>by Kari Pahula</span>
<i>at 2019-09-25T13:52:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -Wderiving-defaults (#15839)
Enabling both DeriveAnyClass and GeneralizedNewtypeDeriving can cause
a warning when no explicit deriving strategy is in use. This change adds
an enable/suppress flag for it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4540bbe2811e860f35de6e67ab2f0040592fd3a5">4540bbe2</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-25T13:53:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">includes/CodeGen.Platform.hs don't include ghcautoconf.h
It doesn't need it, and it shouldn't need it or else multi-target will
break.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebc65025435b1c441cfd9fa3dd460201cea4576d">ebc65025</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-25T13:54:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Only ever check constantly many models against a single pattern
Introduces a new flag `-fmax-pmcheck-deltas` to achieve that. Deprecates
the old `-fmax-pmcheck-iter` mechanism in favor of this new flag.
>From the user's guide:
Pattern match checking can be exponential in some cases. This limit makes sure
we scale polynomially in the number of patterns, by forgetting refined
information gained from a partially successful match. For example, when
matching `x` against `Just 4`, we split each incoming matching model into two
sub-models: One where `x` is not `Nothing` and one where `x` is `Just y` but
`y` is not `4`. When the number of incoming models exceeds the limit, we
continue checking the next clause with the original, unrefined model.
This also retires the incredibly hard to understand "maximum number of
refinements" mechanism, because the current mechanism is more general
and should catch the same exponential cases like PrelRules at the same
time.
-------------------------
Metric Decrease:
T11822
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d90d0bade05fa63b81fe68d42c4242dd97c46e77">d90d0bad</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-25T13:55:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Move Ix typeclass to GHC.Ix
The `Ix` class seems rather orthogonal to its original home in
`GHC.Arr`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/795986aaf33e2ffc233836b86a92a77366c91db2">795986aa</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-09-25T13:56:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unneeded CPP now that GHC 8.6 is the minimum
The minimum required GHC version for bootstrapping is 8.6, so we can
get rid of some unneeded `#if `__GLASGOW_HASKELL__` CPP guards, as
well as one `MIN_VERSION_ghc_prim(0,5,3)` guard (since GHC 8.6 bundles
`ghc-prim-0.5.3`).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b5eede97804ec3dfbfa9df9f97bcfe2aa369f6b">0b5eede9</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-09-25T21:06:04+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Standalone kind signatures (#16794)
Implements GHC Proposal #54: .../ghc-proposals/blob/master/proposals/0054-kind-signatures.rst
With this patch, a type constructor can now be given an explicit
standalone kind signature:
{-# LANGUAGE StandaloneKindSignatures #-}
type Functor :: (Type -> Type) -> Constraint
class Functor f where
fmap :: (a -> b) -> f a -> f b
This is a replacement for CUSKs (complete user-specified
kind signatures), which are now scheduled for deprecation.
User-facing changes
-------------------
* A new extension flag has been added, -XStandaloneKindSignatures, which
implies -XNoCUSKs.
* There is a new syntactic construct, a standalone kind signature:
type <name> :: <kind>
Declarations of data types, classes, data families, type families, and
type synonyms may be accompanied by a standalone kind signature.
* A standalone kind signature enables polymorphic recursion in types,
just like a function type signature enables polymorphic recursion in
terms. This obviates the need for CUSKs.
* TemplateHaskell AST has been extended with 'KiSigD' to represent
standalone kind signatures.
* GHCi :info command now prints the kind signature of type constructors:
ghci> :info Functor
type Functor :: (Type -> Type) -> Constraint
...
Limitations
-----------
* 'forall'-bound type variables of a standalone kind signature do not
scope over the declaration body, even if the -XScopedTypeVariables is
enabled. See #16635 and #16734.
* Wildcards are not allowed in standalone kind signatures, as partial
signatures do not allow for polymorphic recursion.
* Associated types may not be given an explicit standalone kind
signature. Instead, they are assumed to have a CUSK if the parent class
has a standalone kind signature and regardless of the -XCUSKs flag.
* Standalone kind signatures do not support multiple names at the moment:
type T1, T2 :: Type -> Type -- rejected
type T1 = Maybe
type T2 = Either String
See #16754.
* Creative use of equality constraints in standalone kind signatures may
lead to GHC panics:
type C :: forall (a :: Type) -> a ~ Int => Constraint
class C a where
f :: C a => a -> Int
See #16758.
Implementation notes
--------------------
* The heart of this patch is the 'kcDeclHeader' function, which is used to
kind-check a declaration header against its standalone kind signature.
It does so in two rounds:
1. check user-written binders
2. instantiate invisible binders a la 'checkExpectedKind'
* 'kcTyClGroup' now partitions declarations into declarations with a
standalone kind signature or a CUSK (kinded_decls) and declarations
without either (kindless_decls):
* 'kinded_decls' are kind-checked with 'checkInitialKinds'
* 'kindless_decls' are kind-checked with 'getInitialKinds'
* DerivInfo has been extended with a new field:
di_scoped_tvs :: ![(Name,TyVar)]
These variables must be added to the context in case the deriving clause
references tcTyConScopedTyVars. See #16731.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f81fab062e521b6b59f3f7b93bc410fd1111166">4f81fab0</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-09-26T14:04:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make -fbyte-code prevent unboxed tuples/sums from implying object code (#16876)
This resolves #16876 by making the explicit use of `-fbyte-code`
prevent code that enables `UnboxedTuples` or `UnboxedSums` from
automatically compiling to object code. This allows for a nice
middle ground where most code that enables `UnboxedTuples`/-`Sums`
will still benefit from automatically enabling `-fobject-code`, but
allows power users who wish to avoid this behavior in certain corner
cases (such as `lens`, whose use case is documented in #16876) to do
so.
Along the way, I did a little cleanup of the relevant code and
documentation:
* `enableCodeGenForUnboxedTuples` was only checking for the presence
of `UnboxedTuples`, but `UnboxedSums` has the same complications.
I fixed this and renamed the function to
`enableCodeGenForUnboxedTuplesOrSums`.
* I amended the users' guide with a discussion of these issues.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/289fc8da2a29dab8282538a0ddc5db7617cdca5b">289fc8da</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-27T22:10:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Elaborate what 'model' means in the user guide [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c02a793be61a66bc091729f50e567096ab74a5c">9c02a793</a></strong>
<div>
<span>by Ron Mordechai</span>
<i>at 2019-09-27T22:11:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow users to disable Unicode with an env var
Unicode renders funny on my terminal and I like to avoid it where
possible. Most applications which print out non-ascii characters allow
users to disable such prints with an environment variable (e.g.
Homebrew).
This diff disables Unicode usage when the environment variable
`GHC_NO_UNICODE` is set. To test, set the env var and compile a bad
program. Note that GHC does not print Unicode bullets but instead prints
out asterisks:
```
$ GHC_NO_UNICODE= _build/stage1/bin/ghc ../Temp.hs
[1 of 1] Compiling Temp ( ../Temp.hs, ../Temp.o )
../Temp.hs:4:23: error:
* Couldn't match type `Bool' with `a -> Bool'
Expected type: Bool -> a -> Bool
Actual type: Bool -> Bool
* In the first argument of `foldl', namely `(&& (flip $ elem u))'
In the expression: foldl (&& (flip $ elem u)) True v
In an equation for `isPermut':
isPermut u v = foldl (&& (flip $ elem u)) True v
* Relevant bindings include
v :: [a] (bound at ../Temp.hs:4:12)
u :: [a] (bound at ../Temp.hs:4:10)
isPermut :: [a] -> [a] -> Bool (bound at ../Temp.hs:4:1)
|
4 | isPermut u v = foldl (&& (flip $ elem u)) True v
| ^^^^^^^^^^^^^^^^^^
```
(Broken code taken from Stack Overflow)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/144abba394c6a23eb877fbde727111a5e75b9d47">144abba3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-27T22:11:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Don't depend upon alex in source dist build
This fixes #16860 by verifying that the generated sources don't already
exist before asserting that the `alex` executable was found. This
replicates the logic already used for `happy` in the case of `alex`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6fb913c085d4e59a017bbfaf772145c485ffcd3">c6fb913c</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-09-27T22:12:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Just get RTS libs from its package conf
`rts.conf` already contains this exact information in its
`extra-libraries` stanza.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f07862b483e8fb980d601d92148afe0979294ac8">f07862b4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-27T22:13:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-prim: Fix documentation of Type
As pointed out in #17243, `Type` is not the only kind
having values.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0201d0bf55cdca218a0eec89b8b9ccc55c0297d3">0201d0bf</a></strong>
<div>
<span>by chris-martin</span>
<i>at 2019-09-27T22:14:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify the purpose and status of the GHC.TypeLits module</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/444e554f6d034642f3f2a7c077cca412a6c22c5d">444e554f</a></strong>
<div>
<span>by chris-martin</span>
<i>at 2019-09-27T22:14:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expand description of DataKinds to mention data constructors, and include mention of TypeError</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1582dafa319fe3142844847e581d50cf3326e5e0">1582dafa</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-27T22:14:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Look at precendence to give type signatures to some wildcards
Basically do what we currently only do for -XEmptyCase in other cases
where adding the type signature won't distract from pattern
matches in other positions.
We use the precedence to guide us, equating "need to parenthesise" with
"too much noise".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ad0c43900ff98828714f8e5523d3d5edcaeaf441">ad0c4390</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2019-09-27T22:15:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for expected dependencies of 'Parser'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b1fa64da252f53fb46399b9b994930b9e238097">0b1fa64d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-27T22:16:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark cgrun071 as broken on i386
As described in #17247.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/24620182abdfcc65a0cfc0e2f3bc391d464d0ad5">24620182</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2019-09-27T22:17:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Raise minimum GHC version to 8.6
commit 795986aaf33e ("Remove unneeded CPP now that GHC 8.6 is the minimum")
broke the 8.4 build.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0bbb96167fafbc4ed8491731fbcc3353fd8c97d">e0bbb961</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-27T22:17:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark compact_gc as fragile in the ghci way
As noted in #17253.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb984ac6cb072b62215310fc8a1071a2101f7927">bb984ac6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-27T22:18:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark hs_try_putmvar003 as fragile in threaded1
Due to #16361. Note that I'm leaving out threaded2 since it's not clear
whether the single crash in that way was due to other causes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ad2a1f990bb3cf685d741fb69e88cb75300ce561">ad2a1f99</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-27T22:19:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T3389 as broken in profiled ways on i386
As noted in #17256.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f9fa0be8d43a7c9618f6e27e3190dc08bf86bfa">6f9fa0be</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-27T22:20:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark TH tests as fragile in LLVM built external-interpreter
Due to #16087. This drops the previous explicit list of broken tests and rather
encompasses the entire set of tests since they all appear to be broken.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5d888d41eb7b39ea0d4c4aabd07ce8133bfeae6">c5d888d4</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-28T17:11:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: No ConLike instantiation in pmcheck
`pmcheck` used to call `refineToAltCon` which would refine the knowledge
we had about a variable by equating it to a `ConLike` application.
Since we weren't particularly smart about this in the Check module, we
simply freshened the constructors existential and term binders utimately
through a call to `mkOneConFull`.
But that instantiation is unnecessary for when we match against a
concrete pattern! The pattern will already have fresh binders and field
types. So we don't call `refineToAltCon` from `Check` anymore.
Subsequently, we can simplify a couple of call sites and functions in
`PmOracle`. Also implementing `computeCovered` becomes viable and we
don't have to live with the hack that was `addVarPatVecCt` anymore.
A side-effect of not indirectly calling `mkOneConFull` anymore is that
we don't generate the proper strict argument field constraints anymore.
Instead we now desugar ConPatOuts as if they had bangs on their strict
fields. This implies that `PmVar` now carries a `HsImplBang` that we
need to respect by a (somewhat ephemeral) non-void check. We fix #17234
in doing so.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce64b397777408731c6dd3f5c55ea8415f9f565b">ce64b397</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-28T17:12:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`exprOkForSpeculation` for Note [IO hack in the demand analyser]
In #14998 I realised that the notion of speculative execution
*exactly matches* eager evaluation of expressions in a case alternative
where the scrutinee is an IO action.
Normally we have to `deferIO` any result from that single case
alternative to prevent this speculative execution, so we had a special
case in place in the demand analyser that would check if the scrutinee
was a prim-op, in which case we assumed that it would be ok to do the
eager evaluation.
Now we just check if the scrutinee is `exprOkForSpeculation`,
corresponding to the notion that we want to push evaluation of the
scrutinee *after* eagerly evaluating stuff from the case alternative.
This fixes #14988, because it resolves the last open Item 4 there.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3cb8c7cb99e05feb0f62f5a076400dcf9f930a0">f3cb8c7c</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-09-30T22:39:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor iface file generation:
This commit refactors interface file generation to allow information
from the later passed (NCG, STG) to be stored in interface files.
We achieve this by splitting interface file generation into two parts:
* Partial interfaces, built based on the result of the core pipeline
* A fully instantiated interface, which also contains the final
fingerprints and can optionally contain information produced by the backend.
This change is required by !1304 and !1530.
-dynamic-too handling is refactored too: previously when generating code
we'd branch on -dynamic-too *before* code generation, but now we do it
after.
(Original code written by @AndreasK in !1530)
Performance
~~~~~~~~~~~
Before this patch interface files where created and immediately flushed
to disk which made space leaks impossible.
With this change we instead use NFData to force all iface related data
structures to avoid space leaks.
In the process of refactoring it was discovered that the code in the
ToIface Module allocated a lot of thunks which were immediately forced
when writing/forcing the interface file. So we made this module more
strict to avoid creating many of those thunks.
Bottom line is that allocations go down by about ~0.1% compared to
master.
Residency is not meaningfully different after this patch.
Runtime was not benchmarked.
Co-Authored-By: Andreas Klebinger <klebinger.andreas@gmx.at>
Co-Authored-By: Ömer Sinan Ağacan <omer@well-typed.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a1700aa069a028bfdebb2b29778c5eac7ba27df">6a1700aa</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-09-30T22:40:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix arguments for unbound binders in RULE application
We were failing to correctly implement Note [Unbound RULE binders]
in Rules.hs. In particular, when cooking up a fake Refl,
were were failing to apply the substitition.
This patch fixes that problem, and simultaneously tidies
up the impedence mis-match between RuleSubst and TCvSubst.
Thanks to Sebastian!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97811ef5e9e9922184fda5af894188e947a4c799">97811ef5</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-09-30T22:41:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add help message for GHCi :instances command
This commit updates GHCi's help message for GHC 8.10.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f8550a3af45467c37367626dc99c911d3a3d4d1">6f8550a3</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-09-30T22:42:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move pattern match checker modules to GHC.HsToCore.PmCheck
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b36dd49b6ce14c6d7781518091fd0d98d5730899">b36dd49b</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-09-30T22:42:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add minimal test for :doc command
Currently, there are no testcases for GHCi `:doc` command.
Perhaps because it was experimental. And it could be changed in the future.
But `:doc` command is already useful, so I add a minimal regression test
to keep current behavior.
See also 85309a3cda for implementation of `:doc` command.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bdba6ac28cc90497e0f1d5d71fc62326455edaae">bdba6ac2</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-09-30T22:43:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not rely on CUSKs in 'base'
Use standalone kind signatures instead of complete user-specified kinds
in Data.Type.Equality and Data.Typeable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dbdf6a3dc94bebe72d802b8b454d0c6e61e6ec92">dbdf6a3d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-30T22:44:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T3389 as broken in hpc way on i386
See #17256.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822481d5658280fa76f648c3d56dc6a456b8d3a3">822481d5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-09-30T22:44:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Marks process003 as fragile, as noted in #17245.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6548b7b00e251d24122a1aa5b2b262c9cea52c12">6548b7b0</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-10-01T09:22:10+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a bunch of testcases for the pattern match checker
Adds regression tests for tickets #17207, #17208, #17215, #17216,
#17218, #17219, #17248
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/580132203bca785d724f8bc98282141a6b7859ef">58013220</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-10-01T09:22:18+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add testcases inspired by Luke Maranget's pattern match series
In his paper "Warnings for Pattern Matching", Luke Maranget describes
three series in his appendix for which GHC's pattern match checker
scaled very badly. We mostly avoid this now with !1752. This commit adds
regression tests for each of the series.
Fixes #17264.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c00217742c1f3a2582a5b36b2df57ad08062744">9c002177</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-01T16:24:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor some cruft in TcDeriv
* `mk_eqn_stock`, `mk_eqn_anyclass`, and `mk_eqn_no_mechanism` all
took a continuation of type
`DerivSpecMechanism -> DerivM EarlyDerivSpec` to represent its
primary control flow. However, in practice this continuation was
always instantiated with the `mk_originative_eqn` function, so
there's not much point in making this be a continuation in the
first place.
This patch removes these continuations in favor of invoking
`mk_originative_eqn` directly, which is simpler.
* There were several parts of `TcDeriv` that took different code
paths if compiling an `.hs-boot` file. But this is silly, because
ever since 101a8c770b9d3abd57ff289bffea3d838cf25c80 we simply error
eagerly whenever attempting to derive any instances in an
`.hs-boot` file.
This patch removes all of the unnecessary `.hs-boot` code paths,
leaving only one (which errors out).
* Remove various error continuation arguments from `mk_eqn_stock`
and related functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a27a06380fd706e0f2e040c4f01ae306bfd062b">9a27a063</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2019-10-01T16:55:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Libffi rule now `produces` dynamic library files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0956c1941bbd80fb6218b4ddeb0e9bd822d71855">0956c194</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2019-10-01T16:55:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: do not cache GHC configure rule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8924224ecfa065ebc67b96a90d01cf9d2edd0e77">8924224e</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-01T16:55:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make small INLINE functions behave properly
Simon writes:
Currently we check for a type arg rather than isTyCoArg. This in turn
makes INLINE things look bigger than they should be, and stops them
being inlined into boring contexts when they perfectly well could be.
E.g.
f x = g <refl> x
{-# INLINE g #-}
... (map (f x) xs) ...
The context is boring, so don't inline unconditionally. But f's RHS is
no bigger than its call, provided you realise that the coercion argument
is ultimately cost-free.
This happens in practice for $WHRefl. It's not a big deal: at most it
means we have an extra function call overhead. But it's untidy, and
actually worse than what happens without an INLINE pragma.
Fixes #17182
This makes 0.0% change in nofib binary sizes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53b0c6e0cd2bf0a719fa64d6eb428061b567bc42">53b0c6e0</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-10-03T08:15:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Typo in comment [ci skip]</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/60229e9ee23afd302766475462767516cc294409">60229e9e</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-03T12:17:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge TcTypeableValidity into TcTypeable, document treatment of casts
This patch:
* Implements a refactoring (suggested in
https://gitlab.haskell.org/ghc/ghc/merge_requests/1199#note_207345)
that moves all functions from `TcTypeableValidity` back to
`TcTypeable`, as the former module doesn't really need to live on its
own.
* Adds `Note [Typeable instances for casted types]` to `TcTypeable`
explaining why the `Typeable` solver currently does not support
types containing casts.
Resolves #16835.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b9d4907582e6d167cb7e7a8b1011ad3b0bf646b">3b9d4907</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-10-03T12:17:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Note [Don't flatten tuples from HsSyn] in MkCore
Previously, we would sometimes flatten 1-tuples and sometimes
not. This didn't cause damage because there is no way to
generate HsSyn with 1-tuples. But, with the upcoming fix to #16881,
there will be. Without this patch, obscure lint errors would
have resulted.
No test case, as there is not yet a way to tickle this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a254d6bf46e93285894593da38ef8e5bb8bf206">8a254d6b</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-03T12:17:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix new compact block allocation in allocateForCompact
allocateForCompact() is called when nursery of a compact region is
full, to add new blocks to the compact. New blocks added to an existing
region needs a StgCompactNFDataBlock header, not a StgCompactNFData.
This fixes allocateForCompact() so that it now correctly allocates space
for StgCompactNFDataBlock instead of StgCompactNFData as before.
Fixes #17044.
A regression test T17044 added.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c7b172b33db417ccd43ed794362725c1165bc04">3c7b172b</a></strong>
<div>
<span>by James Brock</span>
<i>at 2019-10-03T12:17:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs String, hyperlink to Data.List
Add a reference to the documentation for Data.List in the description
for String.
On the generated Haddock for Data.String,
http://hackage.haskell.org/package/base-4.12.0.0/docs/Data-String.html
there is curently no hyperlink to Data.List, which is where a reader will find most of the useful functions which can operate on Strings. I imagine this has confused beginners who came to this page looking for String operations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67bf734c6c118aa7caa06875f253defe8b7dd271">67bf734c</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-03T12:17:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add `module {-# SOURCE #-} Foo` syntax for hs-boot in bkp
This is a good convenience for testing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6655ec734a51eda91273585d8d8e3d5d308a6628">6655ec73</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-10-03T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve documentation around empty tuples/lists
This patch also changes the way we handle empty lists, simplifying
them somewhat. See Note [Empty lists]. Previously, we had to
special-case empty lists in the type-checker. Now no more!
Finally, this patch improves some documentation around the ir_inst
field used in the type-checker.
This breaks a test case, but I really think the problem is #17251,
not really related to this patch.
Test case: typecheck/should_compile/T13680
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a4ff210d833dde4c2a388a53ad93fa121682a26">9a4ff210</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-03T12:17:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Haddock submodule remote point to gitlab mirror
This makes it match the others
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb364bc25592260a157c9d977619c42f3b2772a4">cb364bc2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-03T12:17:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark print037 as fragile, not broken
See #16205.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/259f4dffaf6698ab6923487e6aa0394d387ae8c6">259f4dff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-03T12:17:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Exclude rts.cabal from source distributions
This modifies both the Hadrian and make build systems to avoid included
the rts.cabal generated by autoconf in the source distribution.
Fixes #17265.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e4c9389678f676aa664fa39cdaf8af865cc24855">e4c93896</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-03T12:17:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: Only warn when split-sections is ignored
Previously we would throw an error which seems a bit harsh. As reported
in #17283.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee6324adfed737fbf9ca3c36538145542b425617">ee6324ad</a></strong>
<div>
<span>by Tobias Guggenmos</span>
<i>at 2019-10-03T12:17:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve documentation for runtime debugging flags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47386fe85a412c8aa35f6bcbce0d41f0eed03b65">47386fe8</a></strong>
<div>
<span>by Tobias Guggenmos</span>
<i>at 2019-10-03T12:17:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add new debug flag -DZ
Zeros heap memory after gc freed it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0924b153b093a925c9e721f2540f3dfd6c278ae">d0924b15</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-10-03T12:17:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Extend argument of createIOThread to word size
Function createIOThread expects its second argument to be of size word.
The natural size of the second parameter is 32bits. Thus for some 64bit
architectures, where a write of the lower half of a register does not
clear the upper half, the value must be zero extended.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1357d02380641ba33b05eb87c80e6a4250cd4a3b">1357d023</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-03T12:17:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rules/haddock: Ensure that RTS stats directory exists
It may not exist if the source tarball was extracted yet not the
testsuite tarball.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ec93d2a90a2d4f189feafd21575b9e9ba5ba9a5d">ec93d2a9</a></strong>
<div>
<span>by Fumiaki Kinoshita</span>
<i>at 2019-10-04T21:43:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Monad instances to `(,,) a b` and `(,,,) a b c`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05419e55cab272ed39790695f448b311f22669f7">05419e55</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-04T21:44:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Per stage headers, ghc_boot_platform.h -> stage 0 ghcplatform.h
The generated headers are now generated per stage, which means we can
skip hacks like `ghc_boot_platform.h` and just have that be the stage 0
header as proper. In general, stages are to be embraced: freely generate
everything in each stage but then just build what you depend on, and
everything is symmetrical and efficient. Trying to avoid stages because
bootstrapping is a mind bender just creates tons of bespoke
mini-mind-benders that add up to something far crazier.
Hadrian was pretty close to this "stage-major" approach already, and so
was fairly easy to fix. Make needed more work, however: it did know
about stages so at least there was a scaffold, but few packages except
for the compiler cared, and the compiler used its own counting system.
That said, make and Hadrian now work more similarly, which is good for
the transition to Hadrian. The merits of embracing stage aside, the
change may be worthy for easing that transition alone.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75a5dd8e614e6056edf846218c08ddfff9384e04">75a5dd8e</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-04T21:44:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove {Build,Host}Platform_NAME from header
They are only used in a file we construct directly, so just skip CPP.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b538476be3706264620c072e6e436debf9e0d3e4">b538476b</a></strong>
<div>
<span>by Daroc Alden</span>
<i>at 2019-10-04T21:45:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deprecate -fwarn-hi-shadowing, because it was never implemented and is
not used.
This fixes #10913.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd8f76b2e3285f8d01d652c8fa8c28e37ea474de">dd8f76b2</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-04T21:45:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factor out a smaller part of Platform for host fallback
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d15b44d699ad12e74106baa43b99b94d80778e7f">d15b44d6</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-04T21:45:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pull out the settings file parsing code into it's own module.
This has two benefits:
1. One less hunk of code dependent on DynFlags
2. Add a little bit of error granularity to distrinugish between missing
data and bad data. This could someday be shared with ghc-pkg which
aims to work even with a missing file. I also am about to to make
--supported-extensions use this too.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb892b28b92351358dd7cb0ee6b0b1a1d7fcc98e">eb892b28</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-04T21:45:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tryFindTopDir to look for the top dir without blowing up if it is
not found.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dded5ecd2f02e13292818ae3729d32832c014f3">0dded5ec</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-04T21:45:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always enable the external interpreter
You can always just not use or even build `iserv`. I don't think the
maintenance cost of the CPP is worth...I can't even tell what the
benefit is.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d31ccdd5754b10fb27fcdc95ddd6c937ecec1bd">0d31ccdd</a></strong>
<div>
<span>by Artem Pyanykh</span>
<i>at 2019-10-04T21:46:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[linker, macho] Don't map/allocate zero size sections and segments
Zero size sections are common even during regular build on MacOS. For
instance:
```
$ ar -xv libHSghc-prim-0.6.1.a longlong.o
$ otool -l longlong.o
longlong.o:
Mach header
magic cputype cpusubtype caps filetype ncmds sizeofcmds flags
0xfeedfacf 16777223 3 0x00 1 2 176 0x00002000
Load command 0
cmd LC_SEGMENT_64
cmdsize 152
segname
vmaddr 0x0000000000000000
vmsize 0x0000000000000000 <-- segment size = 0
fileoff 208
filesize 0
maxprot 0x00000007
initprot 0x00000007
nsects 1
flags 0x0
Section
sectname __text
segname __TEXT
addr 0x0000000000000000
size 0x0000000000000000 <-- section size = 0
offset 208
align 2^0 (1)
reloff 0
nreloc 0
flags 0x80000000
reserved1 0
reserved2 0
cmd LC_BUILD_VERSION
cmdsize 24
platform macos
sdk 10.14
minos 10.14
ntools 0
```
The issue of `mmap`ing 0 bytes was resolved in !1050, but the problem
remained. These 0 size segments and sections were still allocated in
object code, which lead to failed `ASSERT(size > 0)` in
`addProddableBlock` further down the road.
With this change zero size segments **and** sections are not
mapped/allocated at all.
Test plan:
1. Build statically linked GHC.
2. Run `ghc --interactive`. Observe that REPL loads
successfully (which was not the case before).
3. Load several more compiled hs files into repl. No failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93f02b6223b8fc4d85ece389ac0520ee9cc20f2f">93f02b62</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-10-04T21:47:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">New fix for #11647. Avoid side effects like #17171
If a main module doesn't contain a header, we omit the check whether the main module is exported.
With this patch GHC, GHCi and runghc use the same code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8039b6257ce5288e9e38c2593ff2d5d6d316efd4">8039b625</a></strong>
<div>
<span>by Matthew Bauer</span>
<i>at 2019-10-04T21:47:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add musl systems to llvm-targets
This was done in Nixpkgs, but never upstreamed. Musl is pretty much
the same as gnu, but with a different libc. I’ve used the same values
for everything.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee8118caf12526456c619e17cbc0f729c6cd2391">ee8118ca</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-05T00:11:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up `#include`s in the compiler
- Remove unneeded ones
- Use <..> for inter-package.
Besides general clean up, helps distinguish between the RTS we link
against vs the RTS we compile for.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/241921a0c238a047326b0c0f599f1c24222ff66c">241921a0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-05T19:18:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix CNF dirtying logic
Previously due to a silly implementation bug CNFs would never have their
dirty flag set, resulting in their being added again and again to the
`mut_list`. Fix this.
Fixes #17297.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/825c108bd26f20accf1eaef2ba652a2ee12924bb">825c108b</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-07T12:00:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Only flatten up to type family arity in coreFlattenTyFamApp (#16995)
Among other uses, `coreFlattenTyFamApp` is used by Core Lint as a
part of its check to ensure that each type family axiom reduces
according to the way it is defined in the source code. Unfortunately,
the logic that `coreFlattenTyFamApp` uses to flatten type family
applications disagreed with the logic in `TcFlatten`, which caused
it to spuriously complain this program:
```hs
type family Param :: Type -> Type
type family LookupParam (a :: Type) :: Type where
LookupParam (f Char) = Bool
LookupParam x = Int
foo :: LookupParam (Param ())
foo = 42
```
This is because `coreFlattenTyFamApp` tries to flatten the `Param ()`
in `LookupParam (Param ())` to `alpha` (where `alpha` is a flattening
skolem), and GHC is unable to conclude that `alpha` is apart from
`f Char`. This patch spruces up `coreFlattenTyFamApp` so that it
instead flattens `Param ()` to `alpha ()`, which GHC _can_ know for
sure is apart from `f Char`. See
`Note [Flatten], wrinkle 3` in `FamInstEnv`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2577081528fe36facf5153bed256fe838a74ae6">b2577081</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-07T12:01:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor, document, and optimize LLVM configuration loading
As described in the new Note [LLVM Configuration] in SysTools, we now
load llvm-targets and llvm-passes lazily to avoid the overhead of doing
so when -fllvm isn't used (also known as "the common case").
Noticed in #17003.
Metric Decrease:
T12234
T12150
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93c71ae6dbadafc27a061ea5f020f5c8e1c7132f">93c71ae6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-07T12:02:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Determine library versions of template-haskell, et al.
These are needed by the user guide documentation. Fixes #17260.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b78906118dd2919ffb5911200a5a15c8cd341414">b7890611</a></strong>
<div>
<span>by Andrey Mokhov</span>
<i>at 2019-10-07T12:03:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Stop using in-tree Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ceb98f6e44309302af43e179539c3762234e3af">0ceb98f6</a></strong>
<div>
<span>by Andrey Mokhov</span>
<i>at 2019-10-07T12:03:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch to cabal-version=3.0 in ghc-heap.cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3418e96250f68110e149a7c9ec8b3ac2efa8f99">e3418e96</a></strong>
<div>
<span>by Andrey Mokhov</span>
<i>at 2019-10-07T12:03:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch to cabal-version=3.0 in base.cabal and rts.cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/805653f60de3651e0a36e1d332cda68b3bb47381">805653f6</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-07T12:04:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Get rid of wildcard patterns in prim Cmm emitting code
This way, we can be sure we don't miss a case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab945819821be704b0a011dd69f4bd10ae77ec6d">ab945819</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-07T12:05:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor some cruft in TcGenGenerics
* `foldBal` contains needless partiality that can easily be avoided.
* `mkProd_E` and `mkProd_P` both contain unique supply arguments that
are completely unused, which can be removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0edba3a24b513bfe460838f52522598f38bc417">d0edba3a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-07T12:05:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove CONFIGURE_ARGS from configure.ac
It looks like it's been unused since at least
34cc75e1a62638f2833815746ebce0a9114dc26b.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a6bfb0a0b4c3a29652df1320c30035e1347949d">9a6bfb0a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-07T12:06:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Keep OSTYPE local to configure.ac
Unused outside it since b6be81b841e34ca45b3549c4c79e886a8761e59a.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4df39fd071aa5b6863818212df116547201cd29c">4df39fd0</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-07T12:07:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Get rid of GHC_PACKAGE_DB_FLAG
We no longer support booting from older GHC since
527bcc41630918977c73584d99125ff164400695.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31a29a7a626ca0004c54bff4e087ea3894753410">31a29a7a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-07T12:07:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GhcLibsWithUnix
d679ca43e7477284d733b94ff542be5363be3353 meant to remove it but did not
finish the job.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/77ca39e305fe794f6e53d98254e342ad10b86cea">77ca39e3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:11:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add missing TEST_ENV variables
This should fix #16985.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a2798e139e3d20183b59bb5a66012db495c66c7">9a2798e1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:11:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add `validate` and `slow validate` flavours
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab311696539548494db488d2322aafcc4e2c7f4c">ab311696</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:11:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">validate: Use Hadrian's validate flavour
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/98179a777ecff3dc46ce556a090abb3a032ab711">98179a77</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:11:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use validate flavour in hadrian builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8af9eba88c84c21a8753ecb5135050d2ac9f0a2b">8af9eba8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:11:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Document the fact that Typeable is automatically "derived"
This fixes #17060.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/397c6ed5ca5329408db33a64e45102fff23c969a">397c6ed5</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-10-08T05:12:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Identify some semantically equivalent expressions
By introducing a `CoreMap Id` to the term oracle, we can represent
syntactically equivalent expressions by the same `Id`. Combine that with
`CoreOpt.simpleCoreExpr` and it might even catch non-trivial semantic
equalities.
Unfortunately due to scoping issues, this will not solve #17208 for
view patterns yet.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a2e840893bf5a1f775385713fbf0756f96c470d">8a2e8408</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Refer to language extension flags via :extension:
Previously several were referred to via :ghc-flag:`-X...`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cd54538e0fe5be8500335b2b10ed375b852edc2">7cd54538</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Make reverse flags addressable via :ghc-flag:
Previously one could not easily link to the :reverse: flag of a
ghc-flag.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9813afceed61eb72e4c386fbc89b666c51805af">e9813afc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Document -XHaskell98 and -XHaskell2010
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eaeb28a1984ee97dd92fcc410e1f9407d5dd7aba">eaeb28a1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix various warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/180cf1775f4d5fd97814ec87a1d2a8235f0a8152">180cf177</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Document NondecreasingIndentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a26f9e8e4714d547b8c20d2d5ce1ba0644316bf">0a26f9e8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Document -fworker-wrapper
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca4791dba46b0c285763d3dd76a9c8a61b279a35">ca4791db</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Rework pragma key generation
Previously we had a hack to handle the case of multi-token SPECIALISE
pragmas. Now we use a slightly more general rule of using a prefix of
tokens containing only alphabetical characters.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/98c094227c7738a65dfc5908b3397d7275e56ea1">98c09422</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Run sphinx in nit-picky mode
This ensure that it blurts an error on missing references.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a95f7185d38c2b49ef50698211447e47b5be1558">a95f7185</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc: Write out documented flag list
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9402608ea5955c70fee51f8b892d418252846a9b">9402608e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-08T05:12:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Check coverage of GHC flags in users guide
This ensures that all GHC flags are documented during the documentation
build.
Fixes #17315.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ac3bcbb3605fa8ff2481806a3a87a0d9654cd87">9ac3bcbb</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-10-08T13:24:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document the UnliftedFFITypes extension.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/77f3ba23b9fdde95a73c689791122070332733dc">77f3ba23</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-10-08T13:24:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rephrase a bunch of things in the unlifted ffi types documentation. Add a section on pinned byte arrays.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a70db7bf0e1b7ad34e082040d4c380f94525dc30">a70db7bf</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-10-08T13:24:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] link to foreign cmm call
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d41325917f703cc2ee8ee565c2319f02454447d">0d413259</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-10-08T13:24:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] make the table better
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c7a5bcd9c01dd4b8ced5096c8ba2705db3409af">0c7a5bcd</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-10-08T13:24:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] can not -> may not
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a5c249d54d542d765ddbd80161ef4796c781de1">6a5c249d</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-10-08T13:24:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] clarify what unsound means
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf02c26402cf926d41c006ab930ed9747e92a373">bf02c264</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-08T13:25:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark newtype constructors as used in the Coercible solver (#10347)
Currently, newtype constructors are not marked as used when they are
accessed under the hood by uses of `coerce`, as described in #10347.
This fixes #10347 by co-opting the `tcg_keep` field of `TcGblEnv`
to track uses of newtype constructors in the `Coercible` solver.
See `Note [Tracking unused binding and imports]` in `TcRnTypes`.
Since #10347 is fixed, I was able to simplify the code in `TcDeriv`
slightly, as the hack described in
`Note [Newtype deriving and unused constructors]`
is no longer necessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9612e91c793830b3049d2bc9a9ee28d9d82b928d">9612e91c</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-10-08T13:26:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Solve constraints from top-level groups sooner
Previously, all constraints from all top-level groups (as
separated by top-level splices) were lumped together and solved
at the end. This could leak metavariables to TH, though, and
that's bad. This patch solves each group's constraints before
running the next group's splice.
Naturally, we now report fewer errors in some cases.
One nice benefit is that this also fixes #11680, but in a much
simpler way than the original fix for that ticket. Admittedly,
the error messages degrade just a bit from the fix from #11680
(previously, we informed users about variables that will be
brought into scope below a top-level splice, and now we just
report an out-of-scope error), but the amount of complexity
required throughout GHC to get that error was just not worth it.
This patch thus reverts much of
f93c9517a2c6e158e4a5c5bc7a3d3f88cb4ed119.
Fixes #16980
Test cases: th/T16980{,a}
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2d4011c403d6746968df8be0633d0a9ac475d09">c2d4011c</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-10-08T13:27:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump array and haddock submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f691f0c21dcc576e02313123e8b091e241d23b51">f691f0c2</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-10-08T13:27:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Look up parent data family TyCon when populating `PossibleMatches`
The vanilla COMPLETE set is attached to the representation TyCon of a
data family instance, whereas the user-defined COMPLETE sets are
attached to the parent data family TyCon itself.
Previously, we weren't trying particularly hard to get back to the
representation TyCon to the parent data family TyCon, resulting in bugs
like #17207. Now we should do much better.
Fixes the original issue in #17207, but I found another related bug that
isn't so easy to fix.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c0a15a8541a9119536ee17849d8390cb21ab764">0c0a15a8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-09T16:21:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename STAGE macro to GHC_STAGE
To avoid polluting the macro namespace
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63a5371d420686f4959a5be9e5a0d3d647577615">63a5371d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-09T16:21:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Relayout generated header body
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/817c1a947d50a070613815e02a530f83d9078eb8">817c1a94</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-09T16:21:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define GHC_STAGE in headers instead of command-line
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f2c49d804ce38816a62ea0a197dbac79ac8b9c2">5f2c49d8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-09T16:21:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GHC_STAGE guards from MachDeps
This allows the stage1 compiler (which needs to run on the build
platform and produce code for the host) to depend upon properties of the
target. This is wrong. However, it's no more wrong than it was
previously and @Erichson2314 is working on fixing this so I'm going to
remove the guard so we can finally bootstrap HEAD with ghc-8.8 (see
issue #17146).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35cc5eff3d54bacf626ecf0b6e0a1d660cbd6ba9">35cc5eff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-09T16:21:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Test
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d584e3f08cfee6e28b70bf53c573d86e44f326f8">d584e3f0</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-09T16:21:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use addUsedDataCons more judiciously in TcDeriv (#17324)
If you derive an instance like this:
```hs
deriving <...> instance Foo C
```
And the data constructors for `C` aren't in scope, then
`doDerivInstErrorChecks1` throws an error. Moreover, it will
_only_ throw an error if `<...>` is either `stock` or `newtype`.
This is because the code that the `anyclass` or `via` strategies
would generate would not require the use of the data constructors
for `C`.
However, `doDerivInstErrorChecks1` has another purpose. If you
write this:
```hs
import M (C(MkC1, ..., MkCn))
deriving <...> instance Foo C
```
Then `doDerivInstErrorChecks1` will call `addUsedDataCons` on
`MkC1` through `MkCn` to ensure that `-Wunused-imports` does not
complain about them. However, `doDerivInstErrorChecks1` was doing
this for _every_ deriving strategy, which mean that if `<...>` were
`anyclass` or `via`, then the warning about `MkC1` through `MkCn`
being unused would be suppressed!
The fix is simple enough: only call `addUsedDataCons` when the
strategy is `stock` or `newtype`, just like the other code paths
in `doDerivInstErrorChecks1`.
Fixes #17324.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30f5ac07a4843b42ed479462661e9d79f038cf09">30f5ac07</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-10-11T22:10:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Much simpler language for PmCheck
Simon realised that the simple language composed of let bindings, bang
patterns and flat constructor patterns is enough to capture the
semantics of the source pattern language that are important for
pattern-match checking. Well, given that the Oracle is smart enough to
connect the dots in this less informationally dense form, which it is
now.
So we transform `translatePat` to return a list of `PmGrd`s relative to
an incoming match variable. `pmCheck` then trivially translates each of
the `PmGrd`s into constraints that the oracle understands.
Since we pass in the match variable, we incidentally fix #15884
(coverage checks for view patterns) through an interaction with !1746.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/166e1c2adf73b69bfbbec81e98a78814a031ddc7">166e1c2a</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-10-11T22:10:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Take care of assembler source files
Fixes #17286.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2290596f10ce732be85503d3ef0f0b50b7e925a">c2290596</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-12T06:32:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify Configure in a few ways
- No need to distinguish between gcc-llvm and clang. First of all,
gcc-llvm is quite old and surely unmaintained by now. Second of all,
none of the code actually care about that distinction!
Now, it does make sense to consider C multiple frontends for LLVMs in
the form of clang vs clang-cl (same clang, yes, but tweaked
interface). But this is better handled in terms of "gccish vs
mvscish" and "is LLVM", yielding 4 combinations. Therefore, I don't
think it is useful saving the existing code for that.
- Get the remaining CC_LLVM_BACKEND, and also TABLES_NEXT_TO_CODE in
mk/config.h the normal way, rather than hacking it post-hoc. No point
keeping these special cases around for now reason.
- Get rid of hand-rolled `die` function and just use `AC_MSG_ERROR`.
- Abstract check + flag override for unregisterised and tables next to
code.
Oh, and as part of the above I also renamed/combined some variables
where it felt appropriate.
- GccIsClang -> CcLlvmBackend. This is for `AC_SUBST`, like the other
Camal case ones. It was never about gcc-llvm, or Apple's renamed clang,
to be clear.
- llvm_CC_FLAVOR -> CC_LLVM_BACKEND. This is for `AC_DEFINE`, like the
other all-caps snake case ones. llvm_CC_FLAVOR was just silly
indirection *and* an odd name to boot.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1ce3535d20007dc78aeed096f32fc9dfacf11b3">f1ce3535</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-10-12T06:33:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Escape stats file command (#13676)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd1a8808031de162fe92b04de905d59886595abb">cd1a8808</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-10-12T06:33:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Skip T13767 on Darwin
The CI job fails with:
+++ rts/T13676.run/T13676.run.stderr.normalised 2019-10-09 12:27:56.000000000 -0700
@@ -0,0 +1,4 @@
+dyld: Library not loaded: @rpath/libHShaskeline-0.7.5.0-ghc8.9.0.20191009.dylib
+ Referenced from: /Users/builder/builds/ewzE5N2p/0/ghc/ghc/inplace/lib/bin/ghc
+ Reason: image not found
+*** Exception: readCreateProcess: '/Users/builder/builds/ewzE5N2p/0/ghc/ghc/inplace/lib/bin/ghc' '-B/Users/builder/builds/ewzE5N2p/0/ghc/ghc/inplace/lib' '-e' ''/''$'/'' == '/''/x0024'/''' +RTS '-tT13676.t' (exit -6): failed
Unable to reproduce locally.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a338264054a518ddc2ab7920af4489a38c8a214">0a338264</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-12T06:33:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use newDFunName for both manual and derived instances (#17339)
Issue #17339 was caused by using a slightly different version of
`newDFunName` for derived instances that, confusingly enough, did not
take all arguments to the class into account when generating the
`DFun` name. I cannot think of any good reason for doing this, so
this patch uses `newDFunName` uniformly for both derived instances
and manually written instances alike.
Fixes #17339.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c50e4c92d28752beec955d1e3486065685d2f7e6">c50e4c92</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-10-12T13:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix validity checking for inferred types
GHC is suposed to uphold the principle that an /inferred/ type
for a let-binding should obey the rules for that module. E.g.
we should only accept an inferred higher rank type if we have
RankNTypes on.
But we were failing to check this: TcValidity.checkValidType
allowed arbitrary rank for inferred types.
This patch fixes the bug. It might in principle cause some breakage,
but if so that's good: the user should add RankNTypes and/or a
manual signature. (And almost every package has explicit user
signatures for all top-level things anyway.) Let's see.
Fixes #17213.
Metric Decrease:
T10370
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/226d86d29842f894869e23ddb1197d04dacae7f7">226d86d2</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-10-12T13:36:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not add a 'solved dict' for quantified constraints
GHC has a wonderful-but-delicate mechanism for building recursive
dictionaries by adding a goal to the "solved dictionaries" before
solving the sub-goals. See Note [Solved dictionaries] in TcSMonad
Ticket #17267 showed that if you use this mechanism for local
/quantified/ constraints you can get a loop -- or even unsafe
coerce. This patch fixes the bug.
Specifically
* Make TcSMonad.addSolvedDict be conditional on using a
/top level/ instance, not a quantified one.
* Moreover, we /also/ don't want to add a solved dict
for equalities (a~b).
* Add lots more comments to Note [Solved dictionaries]
to explain the above cryptic stuff.
* Extend InstanceWhat to identify those strange built-in
equality instances.
A couple of other things along the way
* Delete the unused Type.isIPPred_maybe.
* Stop making addSolvedDict conditional on not being an
impolicit parameter. This comes from way back. But
it's irrelevant now because IP dicts are never solved
via an instance.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ab1a28d91e2e5331bf20b1e3dc0dff793ebca8b">5ab1a28d</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-10-13T06:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Template Haskell: make unary tuples legal (#16881)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1bd07cd37d9001a58a1c48f4675597350927878">c1bd07cd</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-10-13T06:32:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17334 where NCG did not properly update the CFG.
Statements can change the basic block in which instructions
are placed during instruction selection.
We have to keep track of this switch of the current basic block
as we need this information in order to properly update the CFG.
This commit implements this change and fixes #17334.
We do so by having stmtToInstr return the new block id
if a statement changed the basic block.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1eda9f283e1a715969d0cbe7ce65069c0a49b79d">1eda9f28</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-10-13T19:06:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Add GHCi's ::<builtin-command> form
This commit explicitly adds description about double colon command
of GHCi.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27145351c106eaba666edd06025140931e42607e">27145351</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-10-13T19:06:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add GHCi help message for :def! and :: commands
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78463fc5a238fa01f73bbed236ad17d0a2c37c0b">78463fc5</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-14T08:38:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add docs/users_guide/.log to .gitignore
When the users guide fails to build (as in #17346), a
`docs/users_guide/.log` file will be generated with contents that
look something like this:
```
WARNING: unknown config value 'latex_paper_size' in override, ignoring
/home/rgscott/Software/ghc5/docs/users_guide/ghci.rst:3410: WARNING: u'ghc-flag' reference target not found: -pgmo ?option?
/home/rgscott/Software/ghc5/docs/users_guide/ghci.rst:3410: WARNING: u'ghc-flag' reference target not found: -pgmo ?port?
Encoding error:
'ascii' codec can't encode character u'\u27e8' in position 132: ordinal not in range(128)
The full traceback has been saved in /tmp/sphinx-err-rDF2LX.log, if you want to report the issue to the developers.
```
This definitely should not be checked in to version control, so let's
add this to `.gitignore`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4aba72d62da2fbb499a5eaace361c49c04533600">4aba72d6</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-14T08:39:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mention changes from #16980, #17213 in 8.10.1 release notes
The fixes for these issues both have user-facing consequences, so it
would be good to mention them in the release notes for GHC 8.10.1.
While I'm in town, also mention `UnboxedSums` in the release notes
entry related to `-fobject-code`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ca044fd01df706bff69032cca525e78e2e3f100">0ca044fd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-14T08:39:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Move hadrian-ghc-in-ghci job first
This is a very cheap job and can catch a number of "easy" failure modes
(e.g. missing imports in the compiler). Let's run it first.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2d3594ca173905502d3de2f4e25ef9e36d41906">a2d3594c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-15T01:35:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor some cruft in TcDerivInfer.inferConstraints
The latest installment in my quest to clean up the code in
`TcDeriv*`. This time, my sights are set on
`TcDerivInfer.inferConstraints`, which infers the context for derived
instances. This function is a wee bit awkward at the moment:
* It's not terribly obvious from a quick glance, but
`inferConstraints` is only ever invoked when using the `stock` or
`anyclass` deriving strategies, as the code for inferring the
context for `newtype`- or `via`-derived instances is located
separately in `mk_coerce_based_eqn`. But there's no good reason
for things to be this way, so I moved this code from
`mk_coerce_based_eqn` to `inferConstraints` so that everything
related to inferring instance contexts is located in one place.
* In this process, I discovered that the Haddocks for the auxiliary
function `inferConstraintsDataConArgs` are completely wrong. It
claims that it handles both `stock` and `newtype` deriving, but
this is completely wrong, as discussed above—it only handles
`stock`. To rectify this, I renamed this function to
`inferConstraintsStock` to reflect its actual purpose and created
a new `inferConstraintsCoerceBased` function to specifically
handle `newtype` (and `via`) deriving.
Doing this revealed some opportunities for further simplification:
* Removing the context-inference–related code from
`mk_coerce_based_eqn` made me realize that the overall structure
of the function is basically identical to `mk_originative_eqn`.
In fact, I was easily able to combine the two functions into a
single `mk_eqn_from_mechanism` function.
As part of this merger, I now invoke
`atf_coerce_based_error_checks` from `doDerivInstErrorChecks1`.
* I discovered that GHC defined this function:
```hs
typeToTypeKind = liftedTypeKind `mkVisFunTy` liftedTypeKind
```
No fewer than four times in different modules. I consolidated all
of these definitions in a single location in `TysWiredIn`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/426b0ddc79890f80a8ceeef135371533f066b9ba">426b0ddc</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-15T01:36:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't skip validity checks for built-in classes (#17355)
Issue #17355 occurred because the control flow for
`TcValidity.check_valid_inst_head` was structured in such a way that
whenever it checked a special, built-in class (like `Generic` or
`HasField`), it would skip the most important check of all:
`checkValidTypePats`, which rejects nonsense like this:
```hs
instance Generic (forall a. a)
```
This fixes the issue by carving out `checkValidTypePats` from
`check_valid_inst_head` so that `checkValidTypePats` is always
invoked. `check_valid_inst_head` has also been renamed to
`check_special_inst_head` to reflect its new purpose of _only_
checking for instances headed by special classes.
Fixes #17355.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a55b8a65e3975c1227a78ab50e1db141adc294e8">a55b8a65</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-10-15T18:41:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">iface: export a few more functions from BinIface
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c11f8171a9aebec4b4d19e5eac4140f40c28542">9c11f817</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-15T18:41:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add support for bindist compressors other than Xz
Fixes #17351.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/535a88e1f348112c44e27e0083a68f054b055619">535a88e1</a></strong>
<div>
<span>by klebinger.andreas@gmx.at</span>
<i>at 2019-10-16T07:04:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add loop level analysis to the NCG backend.
For backends maintaining the CFG during codegen
we can now find loops and their nesting level.
This is based on the Cmm CFG and dominator analysis.
As a result we can estimate edge frequencies a lot better
for methods, resulting in far better code layout.
Speedup on nofib: ~1.5%
Increase in compile times: ~1.9%
To make this feasible this commit adds:
* Dominator analysis based on the Lengauer-Tarjan Algorithm.
* An algorithm estimating global edge frequences from branch
probabilities - In CFG.hs
A few static branch prediction heuristics:
* Expect to take the backedge in loops.
* Expect to take the branch NOT exiting a loop.
* Expect integer vs constant comparisons to be false.
We also treat heap/stack checks special for branch prediction
to avoid them being treated as loops.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc2bda505893a65fdc118cb4ccb1c6325dfcc633">cc2bda50</a></strong>
<div>
<span>by adithyaov</span>
<i>at 2019-10-16T07:05:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Compiling with -S and -fno-code no longer panics (fixes #17143)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1964195776d83c621817a75744bc7fe3f46961c9">19641957</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-10-16T07:05:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #8305
This is a test for the current algorithm of GHCi command name resolution.
I add this test in preparation for updating GHCi command name resolution.
For the current algorithm, see https://downloads.haskell.org/ghc/latest/docs/html/users_guide/ghci.html#the-ghci-files
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ede355422086b1430c8dff9ad0702b8e96173fe">6ede3554</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-10-16T07:06:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Infer rho-types instead of sigma-types in guard BindStmts and TransStmts
In #17343 we saw that we didn't handle the pattern guard `!_ <-
undefined` correctly: The `undefined` was never evaluated. Indeed,
elaboration failed to insert the invisible type aruments to `undefined`.
So `undefined` was trivially a normal-form and in turn never entered.
The problem is that we used to infer a sigma-type for the RHS of the
guard, the leading qualifiers of which will never be useful in a pattern
match situation. Hence we infer a rho-type now.
Fixes #17343.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/798037a1f6823c72e3ba59ed726d0ff74d0245e8">798037a1</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-10-16T07:06:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Delete ghctags cabal file
It came back to life in 381c3ae31b68019177f1cd20cb4da2f9d3b7d6c6 by
mistake.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/51fad9e6693fdf8964d104425122d0010229c939">51fad9e6</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-10-16T15:58:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Break up TcRnTypes, among other modules.
This introduces three new modules:
- basicTypes/Predicate.hs describes predicates, moving
this logic out of Type. Predicates don't really exist
in Core, and so don't belong in Type.
- typecheck/TcOrigin.hs describes the origin of constraints
and types. It was easy to remove from other modules and
can often be imported instead of other, scarier modules.
- typecheck/Constraint.hs describes constraints as used in
the solver. It is taken from TcRnTypes.
No work other than module splitting is in this patch.
This is the first step toward homogeneous equality, which will
rely more strongly on predicates. And homogeneous equality is the
next step toward a dependently typed core language.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11d4fc50e13f62b360e1a45472d9bd734aad47cf">11d4fc50</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-16T15:59:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Introduce enableDebugInfo flavour transformer
Also refactor things a bit to eliminate repetition.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/deb96399444ee69f7b7a2c9af1e4242e6c114916">deb96399</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-16T16:00:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Coverage.TM a newtype
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42ebc3f67c8def0f941792b51bd27270ec8e8d88">42ebc3f6</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-10-16T16:01:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add hyperlinks to PDF/HTML documentation; closes #17342
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b15a7fb8aa022bfdf3286d65227061c19a4acf28">b15a7fb8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-17T01:03:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Ensure that makefile tests get run
Previously `makefile_test` and `run_command` tests could easily end up
in a situation where they wouldn't be run if the user used the
`only_ways` modifier. The reason is to build the set of a ways to run
the test in we first start with a candidate set determined by the test
type (e.g. `makefile_test`, `compile_run`, etc.) and then filter that
set with the constraints given by the test's modifiers.
`makefile_test` and `run_command` tests' candidate sets were simply
`{normal}`, and consequently most uses of `only_ways` would result in
the test being never run.
To avoid this we rather use all ways as the candidate sets for these
test types. This may result in a few more testcases than we would like
(given that some `run_command` tests are insensitive to way) but this
can be fixed by adding modifiers and we would much rather run too many
tests than too few.
This fixes #16042 and a number of other tests afflicted by the same issue.
However, there were a few cases that required special attention:
* `T14028` is currently failing and is therefore marked as broken due
to #17300
* `T-signals-child` is fragile in the `threaded1` and `threaded2` ways
(tracked in #17307)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4efdda9057366db3ecf6beb3b889f830c0d8d641">4efdda90</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-10-17T01:03:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tiny fixes to comments around flattening.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4c9904b324736dc5d190a91418e8d8f564d4104">c4c9904b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-17T01:04:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Assert that testsuite ways are known
This ensures that all testsuite way names given to `omit_ways`,
`only_ways`, etc. are known ways.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/697be2b6908d926bf89fcc6cd173459e29022f51">697be2b6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-18T15:26:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/GC: Add an obvious assertion during block initialization
Namely ensure that block descriptors are initialized with valid
generation numbers.
Co-Authored-By: Ben Gamari <ben@well-typed.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61d2ed42f85469fd3878029944ea4b6e50687098">61d2ed42</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-18T15:26:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add Note explaining applicability of selector optimisation depth limit
This was slightly non-obvious so a note seems deserved.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/113950379c2d945397d30f89f4fda0080eac112b">11395037</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-18T15:26:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Capability: A few documentation comments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/206f782a69ce8b0be7a39570abc09dfdf1514f18">206f782a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-18T15:26:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Give stack flags proper macros
This were previously quite unclear and will change a bit under the
non-moving collector so let's clear this up now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/81d4675eea81314ef0df2a20bf621fb383b6958d">81d4675e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-18T15:26:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/GC: Refactor gcCAFs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d674c4e58cf8748108712fa5f034e6363bfde1f">4d674c4e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-18T15:26:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix macro parenthesisation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfcafd39abc9d5f466f2fd284ebb5dbd45b42694">bfcafd39</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-18T15:27:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Schedule: Allow synchronization without holding a capability
The concurrent mark-and-sweep will be performed by a GHC task which will
not hold a capability. This is necessary to avoid a concurrent mark from
interfering with minor generation collections.
However, the major collector must synchronize with the mutators at the
end of marking to flush their update remembered sets. This patch extends
the `requestSync` mechanism used to synchronize garbage collectors to
allow synchronization without holding a capability.
This change is fairly straightforward as the capability was previously
only required for two reasons:
1. to ensure that we don't try to re-acquire a capability that we
the sync requestor already holds.
2. to provide a way to suspend and later resume the sync request if
there is already a sync pending.
When synchronizing without holding a capability we needn't worry about
consideration (1) at all.
(2) is slightly trickier and may happen, for instance, when a capability
requests a minor collection and shortly thereafter the non-moving mark
thread requests a post-mark synchronization. In this case we need to
ensure that the non-moving mark thread suspends his request until after
the minor GC has concluded to avoid dead-locking. For this we introduce
a condition variable, `sync_finished_cond`, which a
non-capability-bearing requestor will wait on and which is signalled
after a synchronization or GC has finished.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/921e4e360a1244ee63241efc62da28642343fece">921e4e36</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-18T15:27:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/BlockAlloc: Allow aligned allocation requests
This implements support for block group allocations which are aligned to
an integral number of blocks.
This will be used by the nonmoving garbage collector, which uses the
block allocator to allocate the segments which back its heap. These
segments are a fixed number of blocks in size, with each segment being
aligned to the segment size boundary. This allows us to easily find the
segment metadata stored at the beginning of the segment.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b431f334018eaef2cf36de3316025c68c922915">4b431f33</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2019-10-20T16:21:10+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Windows: Update tarballs to GCC 9.2 and remove MAX_PATH limit.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8057ac965f72285a62cd57432c0a4f941a96a086">8057ac96</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge branches 'wip/gc/sync-without-capability' and 'wip/gc/aligned-block-allocation' into wip/gc/preparation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32500f64935201828843b29899aaf28d3a1aa777">32500f64</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-20T21:15:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/StableName: Expose FOR_EACH_STABLE_NAME, freeSnEntry, SNT_size
These will be needed when we implement sweeping in the nonmoving
collector.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4be5152a04fe8cdeac896a934c64fea0590aacb8">4be5152a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Disable aggregate-return warnings from gcc
This warning is a bit of a relic; there is little reason to avoid
aggregate return values in 2019.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04471c4f9037065c274736a3693cba116db7bcb9">04471c4f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-20T21:15:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Scav: Expose scavenging functions
To keep the non-moving collector nicely separated from the moving
collector its scavenging phase will live in another file,
`NonMovingScav.c`. However, it will need to use these functions so
let's expose them.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ff29c064dc042855a0a9a7ebe2cfac55edf17f3">6ff29c06</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Introduce flag to enable the nonmoving old generation
This flag will enable the use of a non-moving oldest generation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3ef2d1a861e9b892d64f22f6a233ea331db86d1">b3ef2d1a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Introduce debug flag for non-moving GC
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68e0647f432f9d79ae13a23f614ef293bfd297a9">68e0647f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-20T21:15:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Non-concurrent mark and sweep
This implements the core heap structure and a serial mark/sweep
collector which can be used to manage the oldest-generation heap.
This is the first step towards a concurrent mark-and-sweep collector
aimed at low-latency applications.
The full design of the collector implemented here is described in detail
in a technical note
B. Gamari. "A Concurrent Garbage Collector For the Glasgow Haskell
Compiler" (2018)
The basic heap structure used in this design is heavily inspired by
K. Ueno & A. Ohori. "A fully concurrent garbage collector for
functional programs on multicore processors." /ACM SIGPLAN Notices/
Vol. 51. No. 9 (presented by ICFP 2016)
This design is intended to allow both marking and sweeping
concurrent to execution of a multi-core mutator. Unlike the Ueno design,
which requires no global synchronization pauses, the collector
introduced here requires a stop-the-world pause at the beginning and end
of the mark phase.
To avoid heap fragmentation, the allocator consists of a number of
fixed-size /sub-allocators/. Each of these sub-allocators allocators into
its own set of /segments/, themselves allocated from the block
allocator. Each segment is broken into a set of fixed-size allocation
blocks (which back allocations) in addition to a bitmap (used to track
the liveness of blocks) and some additional metadata (used also used
to track liveness).
This heap structure enables collection via mark-and-sweep, which can be
performed concurrently via a snapshot-at-the-beginning scheme (although
concurrent collection is not implemented in this patch).
The mark queue is a fairly straightforward chunked-array structure.
The representation is a bit more verbose than a typical mark queue to
accomodate a combination of two features:
* a mark FIFO, which improves the locality of marking, reducing one of
the major overheads seen in mark/sweep allocators (see [1] for
details)
* the selector optimization and indirection shortcutting, which
requires that we track where we found each reference to an object
in case we need to update the reference at a later point (e.g. when
we find that it is an indirection). See Note [Origin references in
the nonmoving collector] (in `NonMovingMark.h`) for details.
Beyond this the mark/sweep is fairly run-of-the-mill.
[1] R. Garner, S.M. Blackburn, D. Frampton. "Effective Prefetch for
Mark-Sweep Garbage Collection." ISMM 2007.
Co-Authored-By: Ben Gamari <ben@well-typed.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7e73d1234ecd34ab29e7da2d23e8f67df6a5b15">c7e73d12</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add nonmoving WAY
This simply runs the compile_and_run tests with `-xn`, enabling the
nonmoving oldest generation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8f77a070f4a9a93944dff0b7270162a40931c58">f8f77a07</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Mark binder as const
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd8e3ff43b64a72ed1c820e89691d0a83a1c6e96">bd8e3ff4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Implement concurrent collection in the nonmoving collector
This extends the non-moving collector to allow concurrent collection.
The full design of the collector implemented here is described in detail
in a technical note
B. Gamari. "A Concurrent Garbage Collector For the Glasgow Haskell
Compiler" (2018)
This extension involves the introduction of a capability-local
remembered set, known as the /update remembered set/, which tracks
objects which may no longer be visible to the collector due to mutation.
To maintain this remembered set we introduce a write barrier on
mutations which is enabled while a concurrent mark is underway.
The update remembered set representation is similar to that of the
nonmoving mark queue, being a chunked array of `MarkEntry`s. Each
`Capability` maintains a single accumulator chunk, which it flushed
when it (a) is filled, or (b) when the nonmoving collector enters its
post-mark synchronization phase.
While the write barrier touches a significant amount of code it is
conceptually straightforward: the mutator must ensure that the referee
of any pointer it overwrites is added to the update remembered set.
However, there are a few details:
* In the case of objects with a dirty flag (e.g. `MVar`s) we can
exploit the fact that only the *first* mutation requires a write
barrier.
* Weak references, as usual, complicate things. In particular, we must
ensure that the referee of a weak object is marked if dereferenced by
the mutator. For this we (unfortunately) must introduce a read
barrier, as described in Note [Concurrent read barrier on deRefWeak#]
(in `NonMovingMark.c`).
* Stable names are also a bit tricky as described in Note [Sweeping
stable names in the concurrent collector] (`NonMovingSweep.c`).
We take quite some pains to ensure that the high thread count often seen
in parallel Haskell applications doesn't affect pause times. To this end
we allow thread stacks to be marked either by the thread itself (when it
is executed or stack-underflows) or the concurrent mark thread (if the
thread owning the stack is never scheduled). There is a non-trivial
handshake to ensure that this happens without racing which is described
in Note [StgStack dirtiness flags and concurrent marking].
Co-Authored-by: Ömer Sinan Ağacan <omer@well-typed.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd1b4fddacf398f120099268538a358c6f6f4761">dd1b4fdd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Nonmoving: Disable memory inventory with concurrent collection
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a44ab330285643a6bee6acc6bd47d44118a6def">4a44ab33</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Shrink size of STACK's dirty and marking fields
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1037341648466158fd55bd1d50e1f81c8cfd1516">10373416</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-20T21:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't cleanup until we've stopped the collector
This requires that we break nonmovingExit into two pieces since we need
to first stop the collector to relinquish any capabilities, then we need
to shutdown the scheduler, then we need to free the nonmoving
allocators.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/26c3827f0b878f5bde7b5261076eb8452847fdb4">26c3827f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-21T11:43:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Nonmoving: Ensure write barrier vanishes in non-threaded RTS
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/17e5a032a66bc043b453727706d4fa95a7951202">17e5a032</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-21T11:43:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ThreadPaused: Add barrer on updated thunk
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ea316da1dec77f20c742215874f8884b6e20558">8ea316da</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2019-10-22T02:07:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CI: Always dump performance metrics.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa31ceaf7568802590f73a740ffbc8b800096342">aa31ceaf</a></strong>
<div>
<span>by Matthew Bauer</span>
<i>at 2019-10-22T02:39:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace freebsd-gnueabihf with freebsd
FreeBSD does not support GNU libc, so it makes no sense to use this
triple. Most likely previous builds were just using the FreeBSD libc
instead of gnueabihf. To fix this, we should just use
armv6-unknown-freebsd and armv7-unknown-freebsd triples. Note that
both of these are actually "soft-float", not "hard-float". FreeBSD has
never officially released hard-float arm32:
https://wiki.freebsd.org/ARMTier1
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd8b666acfee5524a2d7c8b845a3782f6a89bec7">fd8b666a</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-10-22T02:39:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement s390x LLVM backend.
This patch adds support for the s390x architecture for the LLVM code
generator. The patch includes a register mapping of STG registers onto
s390x machine registers which enables a registerised build.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d2cc76ffb781d01c800608cd8be05cca67ac4c0">2d2cc76f</a></strong>
<div>
<span>by Tilman Blumhagen</span>
<i>at 2019-10-22T02:39:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Documentation for (&&) and (&&) states that they are lazy in their second argument (fixes #17354)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06d51c4ef776ee1bf66e3603b4c6e4e2acf8ba3c">06d51c4e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:13:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix unregisterised build
This required some fiddling around with the location of forward
declarations since the C sources generated by GHC's C backend only
includes Stg.h.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/912e440e6f0277730b2ad611097f96588cc435a3">912e440e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:17:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Tracing support for nonmoving collection events
This introduces a few events to mark key points in the nonmoving
garbage collection cycle. These include:
* `EVENT_CONC_MARK_BEGIN`, denoting the beginning of a round of
marking. This may happen more than once in a single major collection
since we the major collector iterates until it hits a fixed point.
* `EVENT_CONC_MARK_END`, denoting the end of a round of marking.
* `EVENT_CONC_SYNC_BEGIN`, denoting the beginning of the post-mark
synchronization phase
* `EVENT_CONC_UPD_REM_SET_FLUSH`, indicating that a capability has
flushed its update remembered set.
* `EVENT_CONC_SYNC_END`, denoting that all mutators have flushed their
update remembered sets.
* `EVENT_CONC_SWEEP_BEGIN`, denoting the beginning of the sweep portion
of the major collection.
* `EVENT_CONC_SWEEP_END`, denoting the end of the sweep portion of the
major collection.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f42cd81af3daa1009509be606e43763dd4c3cea">9f42cd81</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:17:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Introduce non-moving heap census
This introduces a simple census of the non-moving heap (not to be
confused with the heap census used by the heap profiler). This
collects basic heap usage information (number of allocated and free
blocks) which is useful when characterising fragmentation of the
nonmoving heap.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/711837cc4af86904a7d75aea7e3cf66d523128d5">711837cc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:17:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Eventlog: More descriptive error message
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d31819ed27f6763f5d253df0c1226d4c844e802">0d31819e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:17:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow census without live word count
Otherwise the census is unsafe when mutators are running due to
concurrent mutation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f1731812331d4ddb4326fdfcefa095b867547e9">6f173181</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:17:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonmovingCensus: Emit samples to eventlog
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13dd78ddb158f98b35ad2eda50d0a7af63920ece">13dd78dd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Nonmoving: Allow aging and refactor static objects logic
This commit does two things:
* Allow aging of objects during the preparatory minor GC
* Refactor handling of static objects to avoid the use of a hashtable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b79e8b49bb5fef06f0f7d86611bc8eb2be30c62">7b79e8b4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable aging when doing deadlock detection GC
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8fffe12bf61347aa9e7fc52d172c989d8d4ca31f">8fffe12b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More comments for aging
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/039d29068f0c0ae6ab133f5dac61948584335677">039d2906</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Eliminate integer division in nonmovingBlockCount
Perf showed that the this single div was capturing up to 10% of samples
in nonmovingMark. However, the overwhelming majority of cases is looking
at small block sizes. These cases we can easily compute explicitly,
allowing the compiler to turn the division into a significantly more
efficient division-by-constant.
While the increase in source code looks scary, this all optimises down
to very nice looking assembler. At this point the only remaining
hotspots in nonmovingBlockCount are due to memory access.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d15ac82dcaf1994a3027596e4c8c48fd300bb62d">d15ac82d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Allocate mark queues in larger block groups
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/26d2d3316dcbf9a49fc7d3252d323d78c0f66e6a">26d2d331</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMovingMark: Optimize representation of mark queue
This shortens MarkQueueEntry by 30% (one word)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5eda61e768a74723f6e7955cc9247c14ecabc6d">e5eda61e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Optimize bitmap search during allocation
Use memchr instead of a open-coded loop. This is nearly twice as fast in
a synthetic benchmark.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dacf4cae179e4f9ee67cd2a5e0c9de7900b5f274">dacf4cae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add prefetch macros
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/786c52d25e94e578a7d76772fbc18fac0ea1b458">786c52d2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Prefetch when clearing bitmaps
Ensure that the bitmap of the segmentt that we will clear next is in
cache by the time we reach it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0387df5bfd166f82ee11d4ce7d96eb52bf1ba9f7">0387df5b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Inline nonmovingClearAllBitmaps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e893877e3964cd8c8b147c14b3a2b38410e7427b">e893877e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Fuse sweep preparation into mark prep
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6f6823f1eb5ae43a7cd782a649f55c40a5d53fd">e6f6823f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Pre-fetch during mark
This improved overall runtime on nofib's constraints test by nearly 10%.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/56c5ebdc5d907313689ac08cbe15145f29fb83d5">56c5ebdc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Prefetch segment header
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19bfe460cd70e4962be83862b86be89d1b7e0f14">19bfe460</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Optimise allocator cache behavior
Previously we would look at the segment header to determine the block
size despite the fact that we already had the block size at hand.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53a1a27e51f978f520b6084aff2e4b25014b5cf3">53a1a27e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMovingMark: Eliminate redundant check_in_nonmoving_heaps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b967e470d806656b0f751d40884ae7edfeaa534c">b967e470</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Don't do major GC if one is already running
Previously we would perform a preparatory moving collection, resulting
in many things being added to the mark queue. When we finished with this
we would realize in nonmovingCollect that there was already a collection
running, in which case we would simply not run the nonmoving collector.
However, it was very easy to end up in a "treadmilling" situation: all
subsequent GC following the first failed major GC would be scheduled as
major GCs. Consequently we would continuously feed the concurrent
collector with more mark queue entries and it would never finish.
This patch aborts the major collection far earlier, meaning that we
avoid adding nonmoving objects to the mark queue and allowing the
concurrent collector to finish.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bc172a41c43ebe3d81caf4d75f10cfb48218006">3bc172a4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Clean mut_list
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e79e2a973c1e4730a1caf402898f6607f84af45">8e79e2a9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Unconditionally flush update remembered set during minor GC
Flush the update remembered set. The goal here is to flush periodically to
ensure that we don't end up with a thread who marks their stack on their
local update remembered set and doesn't flush until the nonmoving sync
period as this would result in a large fraction of the heap being marked
during the sync pause.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b281e80be5169ff3a6aa8044a9996854d9f588fa">b281e80b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add nonmoving_thr way
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/079879570bd697f6e8c8259bcc63eaa17f6cffaf">07987957</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add nonmoving_thr_ghc way
This uses the nonmoving collector when compiling the testcases.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01fd0242c9e8aeaa78f268f3f9b1db1933f91b6e">01fd0242</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't run T15892 in nonmoving ways
The nonmoving GC doesn't support `+RTS -G1`, which this test insists on.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/097f4fd0e242031693d2a6c0384762683d3bee31">097f4fd0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Nonmoving collector doesn't support -G1
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b91dd2566e4d26b7cf5107687f8cbb9b315d3f7">4b91dd25</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Ensure that threaded tests are run in nonmoving_thr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78ce35b967749acb005bda4d72802d237d5f7dca">78ce35b9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: bug1010 requires -c, which isn't supported by nonmoving
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e97cc47d17e3c52d63d5bc3e34da27712b7ce47">6e97cc47</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip T15892 in nonmoving_thr_ghc
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ce853c8e4c104867e02234edddb48ab4d03c1b3">5ce853c8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-heap: Skip heap_all test with debugged RTS
The debugged RTS initializes the heap with 0xaa, which breaks the
(admittedly rather fragile) assumption that uninitialized fields are set
to 0x00:
```
Wrong exit code for heap_all(nonmoving)(expected 0 , actual 1 )
Stderr ( heap_all ):
heap_all: user error (assertClosuresEq: Closures do not match
Expected: FunClosure {info = StgInfoTable {entry = Nothing, ptrs = 0, nptrs = 1, tipe = FUN_0_1, srtlen = 0, code = Nothing}, ptrArgs = [], dataArgs = [0]}
Actual: FunClosure {info = StgInfoTable {entry = Nothing, ptrs = 0, nptrs = 1, tipe = FUN_0_1, srtlen = 1032832, code = Nothing}, ptrArgs = [], dataArgs = [12297829382473034410]}
CallStack (from HasCallStack):
assertClosuresEq, called at heap_all.hs:230:9 in main:Main
)
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6abefce77dbe37ea222e6224cc3500a435717957">6abefce7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Skip ghc_heap_all test in nonmoving ways
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99baff8c7ba2f1ca07cfffb4348fc75d95673366">99baff8c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't run T9630 in nonmoving ways
The nonmoving collector doesn't support -G1
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25ae8f7d3a2c8943c3995ab2c766f52a8adf8d1c">25ae8f7d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't run T7160 in nonmoving_thr ways
The nonmoving way finalizes things in a different order.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cab149bba91b18e4e92cdc13c616fe6465ac84a">8cab149b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark length001 as failing under nonmoving ways
This is consistent with the other unoptimized ways.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b130b3d9d69f23d868765e97fb20d3afa6a6732">5b130b3d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:18:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge branches 'wip/gc/optimize' and 'wip/gc/test' into wip/gc/everything
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/246ce2af639ce192c894ca40d283c04c52d4b750">246ce2af</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-22T12:20:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Implement indirection shortcutting
This allows indirection chains residing in the non-moving heap to be
shorted-out.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/875861efae06a7a35e3cf3fa76faaea9f33903dd">875861ef</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-22T12:20:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Implement selector optimisation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c72e84c6afeadb0b29db181608ebfd2facd841e1">c72e84c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:20:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMovingMark: Handle INDs left by shortcutting
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f8fd3c6ad52dc057d192e3b84e9d10c5503662c">0f8fd3c6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-22T12:20:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Implement -xns to disable selector optimization
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c936a245e723f2ffdbfcb29432cf7131146fbbe3">c936a245</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:20:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Introduce nonmovingSegmentLogBlockSize acccessor
This will allow us to easily move the block size elsewhere.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6dcef5eedaee9a9ecd8b0e41c5f5b93512e6f6c9">6dcef5ee</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:20:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Move block size to block descriptor
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd8d1b4928a9f82d2abfe0926c9ef3b5a20758b5">dd8d1b49</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:20:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Move next_free_snap to block descriptor
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/116e4646f90178cd9f5c7d713074c1a049433134">116e4646</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:20:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NonMoving: Add summarizing Note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22eee2bcc67aab406843b12680955a6cb95470ef">22eee2bc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T12:20:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge branches 'wip/gc/segment-header-to-bdescr' and 'wip/gc/docs' into wip/gc/everything2
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a862703765b578979e34332a4fadda5139544dc">3a862703</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-22T18:56:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: COMPACT_NFDATA support for the nonmoving collector
This largely follows the model used for large objects, with appropriate
adjustments made to account for references in the sharing deduplication
hashtable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c35d39bc4689b56b6b361111255882ab1460141">7c35d39b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T18:56:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Mark nonmoving GC paths in moving collector as unlikely
The expectation here is that the nonmoving GC is latency-centric,
whereas the moving GC emphasizes throughput. Therefore we give the
latter the benefit of better static branch prediction.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/91109404b7acbb9cbec496e519a4fac3f51e4f22">91109404</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T18:57:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Trace GC preparation steps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a69b28f4c33cb1909b8560cbc79ff59bf69caf35">a69b28f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T18:57:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Don't do two passes over large and compact object lists
Previously we would first move the new objects to their appropriate
non-moving GC list, then do another pass over that list to clear their
mark bits. This is needlessly expensive. First clear the mark bits of
the existing objects, then add the newly evacuated objects and, at the
same time, clear their mark bits.
This cuts the preparatory GC time in half for the Pusher benchmark with
a large queue size.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/984745b074c186f6058730087a4fc8156240ec76">984745b0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-22T18:57:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Upper-bound time we hold SM_MUTEX for during sweep
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96c5411ad8859eb5aef274165de2859b7f127c8f">96c5411a</a></strong>
<div>
<span>by David Feuer</span>
<i>at 2019-10-23T05:58:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use an IORef for QSemN
Replace the outer `MVar` in `QSemN` with an `IORef`. This should
probably be lighter, and it removes the need for `uninterruptibleMask`.
Previously Differential Revision https://phabricator.haskell.org/D4896
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/faa30dcb839ed5741b858f13d5b21e059978b88b">faa30dcb</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-10-23T05:58:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Warn about missing profiled libs when using the Interpreter.
When GHC itself, or it's interpreter is profiled we need to load
profiled libraries as well.
This requirement is not always obvious, especially when TH
implicilty uses the interpreter.
When the libs were not found we fall back to assuming the
are in a DLL. This is usually not the case so now we warn
users when we do so. This makes it more obvious what is
happening and gives users a way to fix the issue.
This fixes #17121.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1cd3fa299c85f1b324c22288669c75246e3bc575">1cd3fa29</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-10-23T05:58:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement a coverage checker for injectivity
This fixes #16512.
There are lots of parts of this patch:
* The main payload is in FamInst. See
Note [Coverage condition for injective type families] there
for the overview. But it doesn't fix the bug.
* We now bump the reduction depth every time we discharge
a CFunEqCan. See Note [Flatten when discharging CFunEqCan]
in TcInteract.
* Exploration of this revealed a new, easy to maintain invariant
for CTyEqCans. See Note [Almost function-free] in TcRnTypes.
* We also realized that type inference for injectivity was a
bit incomplete. This means we exchanged lookupFlattenTyVar for
rewriteTyVar. See Note [rewriteTyVar] in TcFlatten. The new
function is monadic while the previous one was pure, necessitating
some faff in TcInteract. Nothing too bad.
* zonkCt did not maintain invariants on CTyEqCan. It's not worth
the bother doing so, so we just transmute CTyEqCans to
CNonCanonicals.
* The pure unifier was finding the fixpoint of the returned
substitution, even when doing one-way matching (in tcUnifyTysWithTFs).
Fixed now.
Test cases: typecheck/should_fail/T16512{a,b}
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/900cf195ed9b372dadc378182a617a1bdf065908">900cf195</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-10-23T05:58:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: introduce DynFlags plugins
They have type '[CommandLineOpts] -> Maybe (DynFlags -> IO DynFlags)'.
All plugins that supply a non-Nothing 'dynflagsPlugin' will see their
updates applied to the current DynFlags right after the plugins are
loaded.
One use case for this is to superseede !1580 for registering hooks
from a plugin. Frontend/parser plugins were considered to achieve this
but they respectively conflict with how this plugin is going to be used
and don't allow overriding/modifying the DynFlags, which is how hooks have
to be registered.
This commit comes with a test, 'test-hook-plugin', that registers a "fake"
meta hook that replaces TH expressions with the 0 integer literal.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a19c7d17d75e5006209ecd5ef76d267888882145">a19c7d17</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-23T05:58:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reify oversaturated data family instances correctly (#17296)
`TcSplice` was not properly handling oversaturated data family
instances, such as the example in #17296, as it dropped arguments due
to carelessly zipping data family instance arguments with
`tyConTyVars`. For data families, the number of `tyConTyVars` can
sometimes be less than the number of arguments it can accept in a
data family instance due to the fact that data family instances can
be oversaturated.
To account for this, `TcSplice.mkIsPolyTvs` has now been renamed to
`tyConArgsPolyKinded` and now factors in `tyConResKind` in addition
to `tyConTyVars`. I've also added
`Note [Reified instances and explicit kind signatures]` which
explains the various subtleties in play here.
Fixes #17296.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b2a5008fbd903964fd3eadab2c5acc4b98e6162">9b2a5008</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-23T05:58:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't run T7653 in ghci and profiled ways
Currently this routinely fails in the i386 job.
See #7653.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b521e8b698cc415684fbc0ea5ddfab51077cb144">b521e8b6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-23T05:58:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor Compact.c:
- Remove forward declarations
- Introduce UNTAG_PTR and GET_PTR_TAG for dealing with pointer tags
without having to cast arguments to StgClosure*
- Remove dead code
- Use W_ instead of StgWord
- Use P_ instead of StgPtr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/17987a4b665d4a270b1bebba1f61d67887f2653c">17987a4b</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-10-23T05:58:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">eventlog: Dump cost centre stack on each sample
With this change it is possible to reconstruct the timing portion of a
`.prof` file after the fact. By logging the stacks at each time point
a more precise executation trace of the program can be observed rather
than all identical cost centres being identified in the report.
There are two new events:
1. `EVENT_PROF_BEGIN` - emitted at the start of profiling to communicate
the tick interval
2. `EVENT_PROF_SAMPLE_COST_CENTRE` - emitted on each tick to communicate the
current call stack.
Fixes #17322
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4798f3b91c23709d7c464004bf07e28c75060c11">4798f3b9</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-10-23T05:59:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow command name resolution for GHCi commands with option `!` #17345
This commit allows command name resolution for GHCi commands
with option `!` as follows:
ghci> :k! Int
Int :: *
= Int
This commit changes implementation as follows:
Before:
* Prefix match with full string including the option `!` (e.g. `k!`)
After (this patch):
* Prefix match without option suffix `!` (e.g. `k`)
* in addition, suffix match with option `!`
See also #8305 and #8113
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa7781521bf2796a6f0b3e3cfc08e9e80ae6dc47">aa778152</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-10-23T05:59:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix bug in the x86 backend involving the CFG.
This is part two of fixing #17334.
There are two parts to this commit:
- A bugfix for computing loop levels
- A bugfix of basic block invariants in the NCG.
-----------------------------------------------------------
In the first bug we ended up with a CFG of the sort: [A -> B -> C]
This was represented via maps as fromList [(A,B),(B,C)] and later
transformed into a adjacency array. However the transformation did
not include block C in the array (since we only looked at the keys of
the map).
This was still fine until we tried to look up successors for C and tried
to read outside of the array bounds when accessing C.
In order to prevent this in the future I refactored to code to include
all nodes as keys in the map representation. And make this a invariant
which is checked in a few places.
Overall I expect this to make the code more robust as now any failed
lookup will represent an error, versus failed lookups sometimes being
expected and sometimes not.
In terms of performance this makes some things cheaper (getting a list
of all nodes) and others more expensive (adding a new edge). Overall
this adds up to no noteable performance difference.
-----------------------------------------------------------
Part 2: When the NCG generated a new basic block, it did
not always insert a NEWBLOCK meta instruction in the stream which
caused a quite subtle bug.
During instruction selection a statement `s`
in a block B with control of the sort: B -> C
will sometimes result in control
flow of the sort:
┌ < ┐
v ^
B -> B1 ┴ -> C
as is the case for some atomic operations.
Now to keep the CFG in sync when introducing B1 we clearly
want to insert it between B and C. However there is
a catch when we have to deal with self loops.
We might start with code and a CFG of these forms:
loop:
stmt1 ┌ < ┐
.... v ^
stmtX loop ┘
stmtY
....
goto loop:
Now we introduce B1:
┌ ─ ─ ─ ─ ─┐
loop: │ ┌ < ┐ │
instrs v │ │ ^
.... loop ┴ B1 ┴ ┘
instrsFromX
stmtY
goto loop:
This is simple, all outgoing edges from loop now simply
start from B1 instead and the code generator knows which
new edges it introduced for the self loop of B1.
Disaster strikes if the statement Y follows the same pattern.
If we apply the same rule that all outgoing edges change then
we end up with:
loop ─> B1 ─> B2 ┬─┐
│ │ └─<┤ │
│ └───<───┘ │
└───────<────────┘
This is problematic. The edge B1->B1 is modified as expected.
However the modification is wrong!
The assembly in this case looked like this:
_loop:
<instrs>
_B1:
...
cmpxchgq ...
jne _B1
<instrs>
<end _B1>
_B2:
...
cmpxchgq ...
jne _B2
<instrs>
jmp loop
There is no edge _B2 -> _B1 here. It's still a self loop onto _B1.
The problem here is that really B1 should be two basic blocks.
Otherwise we have control flow in the *middle* of a basic block.
A contradiction!
So to account for this we add yet another basic block marker:
_B:
<instrs>
_B1:
...
cmpxchgq ...
jne _B1
jmp _B1'
_B1':
<instrs>
<end _B1>
_B2:
...
Now when inserting B2 we will only look at the outgoing edges of B1' and
everything will work out nicely.
You might also wonder why we don't insert jumps at the end of _B1'. There is
no way another block ends up jumping to the labels _B1 or _B2 since they are
essentially invisible to other blocks. View them as control flow labels local
to the basic block if you'd like.
Not doing this ultimately caused (part 2 of) #17334.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f40e68aa1c02f3db685efe140dd941e6ba1edb0">1f40e68a</a></strong>
<div>
<span>by Ryan Yates</span>
<i>at 2019-10-23T05:59:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Full abort on validate failure merging `orElse`.
Previously partial roll back of a branch of an `orElse` was attempted
if validation failure was observed. Validation here, however, does
not account for what part of the transaction observed inconsistent
state. This commit fixes this by fully aborting and restarting the
transaction.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c1f0f7c384eb2e38911b9a9b083ecda0970a060">9c1f0f7c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-23T05:59:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump stm submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6beea836094383eea96b15e526f31b5426aea630">6beea836</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-10-23T05:59:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make dynflag argument for withTiming pure.
19 times out of 20 we already have dynflags in scope.
We could just always use `return dflags`. But this is in fact not free.
When looking at some STG code I noticed that we always allocate a
closure for this expression in the heap. Clearly a waste in these cases.
For the other cases we can either just modify the callsite to
get dynflags or use the _D variants of withTiming I added which
will use getDynFlags under the hood.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dd480cc99d39120026f6595b4870976bc95e54e">8dd480cc</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-10-23T05:59:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Performance tests: Reduce acceptance threshold for bytes allocated tests
The "new" performance testing infrastructure resets the baseline after
every test so it's easy to miss gradual performance regressions over
time. We should at least make these numbers smaller to catch patches
which affect performance earlier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4af20bbc07626815eb0ec04fe665a32bb1827480">4af20bbc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-23T05:59:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix :since: for -Wunused-packages
Fixes #17382.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/21663693524838cf0621a887602368fcb54c1c0a">21663693</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-23T05:59:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Drop duplicate -optl's from GHC invocations
Previously the make build system would pass things like
`-optl-optl-Wl,-x -optl-optl-Wl,noexecstack` to GHC. This would
naturally result in mass confusion as GHC would pass `-optl-Wl,-x` to
GCC. GCC would in turn interpret this as `-o ptl-Wl,-x`, setting the
output pass of the invocation.
The problem that `-optl` was added to the command-line in two places in
the build system. Fix this.
Fixes #17385.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb0dc5a5c1d1fa583b73835d8cb7055020834051">bb0dc5a5</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-10-23T05:59:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Invoke ghc0 via bash when running tests to fix #17362.
cmd uses RawCommand which uses Windows semantics to find the executable
which sometimes seems to fail for unclear reasons.
If we invoke ghc via bash then bash will find the ghc executable and
the issue goes away.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/266435a7ab865467d5027b1a718f74f85b77b96f">266435a7</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-23T05:59:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add new flag for unarised STG dumps
Previously -ddump-stg would dump pre and post-unarise STGs. Now we have
a new flag for post-unarise STG and -ddump-stg only dumps coreToStg
output.
STG dump flags after this commit:
- -ddump-stg: Dumps CoreToStg output
- -ddump-stg-unarised: Unarise output
- -ddump-stg-final: STG right before code gen (includes CSE and lambda
lifting)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8abddac870d4b49f77b5ce56bfeb68328dd0d651">8abddac8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-23T05:59:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Add @since on GHC.IO.Handle.Lock.hUnlock
Unfortunately this was introduced in base-4.11.0 (GHC 8.4.1)
whereas the other locking primitives were added in base-4.10.0 (GHC
8.2.1).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f72b540288bbdb32a6750dd64b9d366501ed10c">7f72b540</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-23T14:56:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge non-moving garbage collector
This introduces a concurrent mark & sweep garbage collector to manage the old
generation. The concurrent nature of this collector typically results in
significantly reduced maximum and mean pause times in applications with large
working sets.
Due to the large and intricate nature of the change I have opted to
preserve the fully-buildable history, including merge commits, which is
described in the "Branch overview" section below.
Collector design
================
The full design of the collector implemented here is described in detail
in a technical note
> B. Gamari. "A Concurrent Garbage Collector For the Glasgow Haskell
> Compiler" (2018)
This document can be requested from @bgamari.
The basic heap structure used in this design is heavily inspired by
> K. Ueno & A. Ohori. "A fully concurrent garbage collector for
> functional programs on multicore processors." /ACM SIGPLAN Notices/
> Vol. 51. No. 9 (presented at ICFP 2016)
This design is intended to allow both marking and sweeping
concurrent to execution of a multi-core mutator. Unlike the Ueno design,
which requires no global synchronization pauses, the collector
introduced here requires a stop-the-world pause at the beginning and end
of the mark phase.
To avoid heap fragmentation, the allocator consists of a number of
fixed-size /sub-allocators/. Each of these sub-allocators allocators into
its own set of /segments/, themselves allocated from the block
allocator. Each segment is broken into a set of fixed-size allocation
blocks (which back allocations) in addition to a bitmap (used to track
the liveness of blocks) and some additional metadata (used also used
to track liveness).
This heap structure enables collection via mark-and-sweep, which can be
performed concurrently via a snapshot-at-the-beginning scheme (although
concurrent collection is not implemented in this patch).
Implementation structure
========================
The majority of the collector is implemented in a handful of files:
* `rts/Nonmoving.c` is the heart of the beast. It implements the entry-point
to the nonmoving collector (`nonmoving_collect`), as well as the allocator
(`nonmoving_allocate`) and a number of utilities for manipulating the heap.
* `rts/NonmovingMark.c` implements the mark queue functionality, update
remembered set, and mark loop.
* `rts/NonmovingSweep.c` implements the sweep loop.
* `rts/NonmovingScav.c` implements the logic necessary to scavenge the
nonmoving heap.
Branch overview
===============
```
* wip/gc/opt-pause:
| A variety of small optimisations to further reduce pause times.
|
* wip/gc/compact-nfdata:
| Introduce support for compact regions into the non-moving
|\ collector
| \
| \
| | * wip/gc/segment-header-to-bdescr:
| | | Another optimization that we are considering, pushing
| | | some segment metadata into the segment descriptor for
| | | the sake of locality during mark
| | |
| * | wip/gc/shortcutting:
| | | Support for indirection shortcutting and the selector optimization
| | | in the non-moving heap.
| | |
* | | wip/gc/docs:
| |/ Work on implementation documentation.
| /
|/
* wip/gc/everything:
| A roll-up of everything below.
|\
| \
| |\
| | \
| | * wip/gc/optimize:
| | | A variety of optimizations, primarily to the mark loop.
| | | Some of these are microoptimizations but a few are quite
| | | significant. In particular, the prefetch patches have
| | | produced a nontrivial improvement in mark performance.
| | |
| | * wip/gc/aging:
| | | Enable support for aging in major collections.
| | |
| * | wip/gc/test:
| | | Fix up the testsuite to more or less pass.
| | |
* | | wip/gc/instrumentation:
| | | A variety of runtime instrumentation including statistics
| | / support, the nonmoving census, and eventlog support.
| |/
| /
|/
* wip/gc/nonmoving-concurrent:
| The concurrent write barriers.
|
* wip/gc/nonmoving-nonconcurrent:
| The nonmoving collector without the write barriers necessary
| for concurrent collection.
|
* wip/gc/preparation:
| A merge of the various preparatory patches that aren't directly
| implementing the GC.
|
|
* GHC HEAD
.
.
.
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83655b06e6d3e93b2d15bb0fa250fbb113d7fe68">83655b06</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-24T08:45:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Warn user if hadrian build fails due to lack of threaded RTS
See #16873.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6824f29aebd28571db118eb6877ef04eda630871">6824f29a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-24T08:46:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parenthesize GADT return types in pprIfaceConDecl (#17384)
We were using `pprIfaceAppArgs` instead of `pprParendIfaceAppArgs`
in `pprIfaceConDecl`. Oops.
Fixes #17384.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9de3f8b1382f46899b2be2092c0b94eae95ae6aa">9de3f8b1</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-24T18:38:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make isTcLevPoly more conservative with newtypes (#17360)
`isTcLevPoly` gives an approximate answer for when a type constructor
is levity polymorphic when fully applied, where `True` means
"possibly levity polymorphic" and `False` means "definitely not
levity polymorphic". `isTcLevPoly` returned `False` for newtypes,
which is incorrect in the presence of `UnliftedNewtypes`, leading
to #17360. This patch tweaks `isTcLevPoly` to return `True` for
newtypes instead.
Fixes #17360.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/243c72eb60fc3481fe6db3fc0ea9cd836a9e7561">243c72eb</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-24T18:39:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark promoted InfixT names as IsPromoted (#17394)
We applied a similar fix for `ConT` in #15572 but forgot to apply the
fix to `InfixT` as well. This patch fixes #17394 by doing just that.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/87175e7870949438401213b8e28ee2722b3de6fd">87175e78</a></strong>
<div>
<span>by James Foster</span>
<i>at 2019-10-25T09:01:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Hadrian use -dynamic-too in the basic case
This commit makes Hadrian use the `-dynamic-too` flag when the current
Flavour's libraryWays contains both vanilla and dynamic, cutting down
the amount of repeated work caused by separate compilation of dynamic
and static files. It does this for the basic case where '.o' and
'.dyn_o' files are built with one command, but does not generalise to
cases like '.prof_o' and '.prof_dyn_o'.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ecd89062985019592d1ed212dcc3b9905ceac315">ecd89062</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-10-25T09:01:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/ci: run testsuite against a freshly produced and installed bindist
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a16b5553fff58a53437a993513484b74aeaaa85">2a16b555</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-25T09:02:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T13786 as fragile in unreg build
Due to #17018.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/082989268ae5507d260c425cd84707e0e32ce4c1">08298926</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-25T09:02:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Use fragile modifier in TH_foreignInterruptible
It looks like this use of `skip` snuck through my previous refactoring.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c7d45d16f9b0ce3cee61274897730f65a5ee569">4c7d45d1</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-10-25T09:03:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make documentation for byteSwap16 consistent with byteSwap32 (impl is same, with s/16/32)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02822d847c0bf6a4562cb1a600251d6568f72ce3">02822d84</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-25T09:03:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">aclocal: A bit of reformatting
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/519f5162614df6d705de3dce23384d63a2b2b81d">519f5162</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-25T09:03:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Drop GccLT46
GCC 4.6 was released 7 years ago. I think we can finally assume that
it's available. This is a simplification prompted by #15742.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acedfc8b8706a92127c96f487e3e3b1636451704">acedfc8b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-25T09:04:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Run check-uniques during lint job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8916e64e5437c99b82d5610286430328af1d86bc">8916e64e</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-10-26T05:19:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement shrinkSmallMutableArray# and resizeSmallMutableArray#.
This is a part of GHC Proposal #25: "Offer more array resizing primitives".
Resources related to the proposal:
- Discussion: https://github.com/ghc-proposals/ghc-proposals/pull/121
- Proposal: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0025-resize-boxed.rst
Only shrinkSmallMutableArray# is implemented as a primop since a
library-space implementation of resizeSmallMutableArray# (in GHC.Exts)
is no less efficient than a primop would be. This may be replaced by
a primop in the future if someone devises a strategy for growing
arrays in-place. The library-space implementation always copies the
array when growing it.
This commit also tweaks the documentation of the deprecated
sizeofMutableByteArray#, removing the mention of concurrency. That
primop is unsound even in single-threaded applications. Additionally,
the non-negativity assertion on the existing shrinkMutableByteArray#
primop has been removed since this predicate is trivially always true.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1be9c35c940e9a1edbb44a0e7dd51b48529ffb9b">1be9c35c</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-10-26T05:20:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #14690 - :steplocal panics after break-on-error
`:steplocal` enables only breakpoints in the current top-level binding.
When a normal breakpoint is hit, then the module name and the break id from the `BRK_FUN` byte code
allow us to access the corresponding entry in a ModBreak table. From this entry we then get the SrcSpan
(see compiler/main/InteractiveEval.hs:bindLocalsAtBreakpoint).
With this source-span we can then determine the current top-level binding, needed for the steplocal command.
However, if we break at an exception or at an error, we don't have an BRK_FUN byte-code, so we don't have any source information.
The function `bindLocalsAtBreakpoint` creates an `UnhelpfulSpan`, which doesn't allow us to determine the current top-level binding.
To avoid a `panic`, we have to check for `UnhelpfulSpan` in the function `ghc/GHCi/UI.hs:stepLocalCmd`.
Hence a :steplocal command after a break-on-exception or a break-on-error is not possible.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4820af10713ddf94eda0aaeca9e010c25ef6614b">4820af10</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2019-10-26T19:53:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: point link to ghc gitlab
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/609c7ee6d09d9336e43d139994daf817d94450b7">609c7ee6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-26T19:53:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Produce ARMv7 binary distributions
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ac49411df6140eb7e64c84c8d4f32eb76bfc4ce">8ac49411</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-26T19:53:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip regalloc_unit_tests unless have_ncg
This is a unit test for the native code generator's register allocator;
naturally. the NCG is required.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6057559683757aa6cc2b69dc81bb0027f5e61fc0">60575596</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-26T19:53:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable PDF documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/417f59d4140ef43714abf0307d2abd0742222db2">417f59d4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-26T19:53:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix ARM linker includes
* Prefer #pragma once over guard macros
* Drop redundant #includes
* Fix order to ensure that necessary macros are defined when we
condition on them
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4054f0e537c467f226c57342371c953e2053fb08">4054f0e5</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-26T19:54:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove redundant -fno-cse options
These were probably added with some GLOBAL_VARs, but those GLOBAL_VARs
are now gone.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c62817f2366fc630098fa02147d0231a3d13f48f">c62817f2</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2019-10-27T11:35:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix RankNTypes :ghc-flag: in users guide
This fixes a hadrian `build docs` failure
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc3a5205b6c3999b2dd8b3269113152180bfbaf4">fc3a5205</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2019-10-27T11:35:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused import
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2520bef5e92d95142e7dfd7fd8ea61f8086aa19">d2520bef</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2019-10-27T11:35:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix path to ghc-flags in users guide Hadrian rules
It should point to the _build directory, not the source
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/896d470a6872b5c36e57d4f068d81b2b14d34233">896d470a</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2019-10-27T11:35:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add back documentation for deprecated -Whi-shadowing
This was removed in b538476be3706264620c072e6e436debf9e0d3e4, but
without it the compare-flags.py script fails. This adds it back and
marks it as deprecated, with a notice that it is slated for removal.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d80f8b5b529a63771d2f9771d5161825721f683">7d80f8b5</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2019-10-27T11:35:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove documented flags from expected-undocumented-flags.txt
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa0d48094afb8025bd85356a5d62d2bc96eb2124">fa0d4809</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-27T11:36:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parenthesize nullary constraint tuples using sigPrec (#17403)
We were using `appPrec`, not `sigPrec`, as the precedence when
determining whether or not to parenthesize `() :: Constraint`,
which lead to the parentheses being omitted in function contexts
like `(() :: Constraint) => String`. Easily fixed.
Fixes #17403.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90d06fd04d7efeae337a6902887a5f67393755d7">90d06fd0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-27T17:27:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Silence output from Support SMP check
Previously we would allow the output from the check of SMP support
introduced by 83655b06e6d3e93b2d15bb0fa250fbb113d7fe68 leak to
stdout. Silence this.
See #16873.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6635a3f67d8e8ebafeccfdce35490601039fe216">6635a3f6</a></strong>
<div>
<span>by Josef Svenningsson</span>
<i>at 2019-10-28T09:20:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #15344: use fail when desugaring applicative-do
Applicative-do has a bug where it fails to use the monadic fail method
when desugaring patternmatches which can fail. See #15344.
This patch fixes that problem. It required more rewiring than I had expected.
Applicative-do happens mostly in the renamer; that's where decisions about
scheduling are made. This schedule is then carried through the typechecker and
into the desugarer which performs the actual translation. Fixing this bug
required sending information about the fail method from the renamer, through
the type checker and into the desugarer. Previously, the desugarer didn't
have enough information to actually desugar pattern matches correctly.
As a side effect, we also fix #16628, where GHC wouldn't catch missing
MonadFail instances with -XApplicativeDo.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd9b94594440163a1a726300d300f76ff05cd15a">cd9b9459</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-10-28T09:21:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor TcDeriv to validity-check less in anyclass/via deriving (#13154)
Due to the way `DerivEnv` is currently structured, there is an
invariant that every derived instance must consist of a class applied
to a non-empty list of argument types, where the last argument *must*
be an application of a type constructor to some arguments. This works
for many cases, but there are also some design patterns in standalone
`anyclass`/`via` deriving that are made impossible due to enforcing
this invariant, as documented in #13154.
This fixes #13154 by refactoring `TcDeriv` and friends to perform
fewer validity checks when using the `anyclass` or `via` strategies.
The highlights are as followed:
* Five fields of `DerivEnv` have been factored out into a new
`DerivInstTys` data type. These fields only make sense for
instances that satisfy the invariant mentioned above, so
`DerivInstTys` is now only used in `stock` and `newtype` deriving,
but not in other deriving strategies.
* There is now a `Note [DerivEnv and DerivSpecMechanism]` describing
the bullet point above in more detail, as well as explaining the
exact requirements that each deriving strategy imposes.
* I've refactored `mkEqnHelp`'s call graph to be slightly less
complicated. Instead of the previous `mkDataTypeEqn`/`mkNewTypeEqn`
dichotomy, there is now a single entrypoint `mk_eqn`.
* Various bits of code were tweaked so as not to use fields that are
specific to `DerivInstTys` so that they may be used by all deriving
strategies, since not all deriving strategies use `DerivInstTys`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0e0485634d9a047b43da958c09e3bf6c5937c0f">e0e04856</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2019-10-28T09:21:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Attach API Annotations for {-# SOURCE #-} import pragma
Attach the API annotations for the start and end locations of the
{-# SOURCE #-} pragma in an ImportDecl.
Closes #17388
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e951f219597a3e8209abd62f85c717865f7445ca">e951f219</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-10-28T09:22:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use FlexibleInstances for `Outputable (* p)` instead of match-all instances with equality constraints
In #17304, Richard and Simon dicovered that using `-XFlexibleInstances`
for `Outputable` instances of AST data types means users can provide orphan
`Outputable` instances for passes other than `GhcPass`.
Type inference doesn't currently to suffer, and Richard gave an example
in #17304 that shows how rare a case would be where the slightly worse
type inference would matter.
So I went ahead with the refactoring, attempting to fix #17304.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ad1fe274411129f82e7bbfd51bde49775288ae4b">ad1fe274</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-10-28T09:23:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Better arity for join points
A join point was getting too large an arity, leading to #17294.
I've tightened up the invariant: see
CoreSyn, Note [Invariants on join points], invariant 2b
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb4f245cf5f38cf22fc8a3f81505b79acdba4ea5">fb4f245c</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-10-29T03:45:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix :since: for -xn flag
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35abbfee8b4298ef7352a3c2341595c774a7244b">35abbfee</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-10-29T03:45:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Add some new features and fix warnings for GHC 8.10
This updates the following:
* Add description for ImportQualifiedPost extension
* Add description for ghci command name resolution
* Fix markdown warnings
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57dc1565e98d7777c5b2783f947ff6dace311ece">57dc1565</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-10-29T03:46:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use `not#` primitive to implement Word's complement
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28e527327753ec9971a98ac19e050d9b0664bc40">28e52732</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:46:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">linters: Add mode to lint given set of files
This makes testing much easier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db43b3b3079842fb2baf6d181ef39374acf0053c">db43b3b3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:46:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">linters: Add linter to catch unquoted use of $(TEST_HC)
This is a common bug that creeps into Makefiles (e.g. see T12674).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebee0d6b902ee50467e8471a3676ba652679b27d">ebee0d6b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:46:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix quoting of $(TEST_HC) in T12674
I have no idea how this went unnoticed until now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bd3456f144fa801a409147a80673f88360c16a2">3bd3456f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-29T03:47:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor HscRecomp constructors:
Make it evident in the constructors that the final interface is only
available when HscStatus is not HscRecomp.
(When HscStatus == HscRecomp we need to finish the compilation to get
the final interface)
`Maybe ModIface` return value of hscIncrementalCompile and the partial
`expectIface` function are removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bbdd54aab2f727bd90efe237eeb72e5e014b0cb2">bbdd54aa</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-29T03:47:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Return ModIface in compilation pipeline, remove IORef hack for generating ModIfaces
The compilation phases now optionally return ModIface (for phases that
generate an interface, currently only HscOut when (re)compiling a file).
The value is then used by compileOne' to return the generated interface
with HomeModInfo (which is then used by the batch mode compiler when
building rest of the tree).
hscIncrementalMode also returns a DynFlags with plugin info, to be used
in the rest of the pipeline.
Unfortunately this introduces a (perhaps less bad) hack in place of the
previous IORef: we now record the DynFlags used to generate the partial
infterface in HscRecomp and use the same DynFlags when generating the
full interface. I spent almost three days trying to understand what's
changing in DynFlags that causes a backpack test to fail, but I couldn't
figure it out. There's a FIXME added next to the field so hopefully
someone who understands this better than I do will fix it leter.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a56433a912c8d666a113ca56aa5f19dec202cdb6">a56433a9</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-29T03:47:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused DynFlags arg of lookupIfaceByModule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcd40c714172c976b9cc1ce5e6c1e0b3a55d968b">dcd40c71</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-29T03:47:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">HscMain: Move a comment closer to the relevant site
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/593f6543d2c9888375d684d46a3d94c63a633c8d">593f6543</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-29T03:47:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">MkIface: Remove redundant parameter and outdated comments from addFingerprints
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f868e1fe2964c8611beca69eae24f4ad6b385d36">f868e1fe</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:48:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use Hadrian for unregisterised job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b2ecbc01aacbbacbbf8a02a0d6913e228f2994b">7b2ecbc0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:48:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Factor out Linux Hadrian validation logic
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e5de15da1ded1909e10483c7ae3ba1ae3e87b17">8e5de15d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:48:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Define USE_LIBFFI_FOR_ADJUSTORS when necessary
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a0902702d64ce683c81c04069f46f6e1078a094">6a090270</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:48:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Define NOSMP when building rts unregisterised
It seems that NOSMP was previously only defined when compiling the
compiler, not the RTS. Fix this.
In addition do some spring-cleaning and make the logic match that of the
Make build system.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b741d19dc0380988f4f5663dc72eef4710bb0771">b741d19d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:48:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Shuffle around RTS build flags
Some of these flags wanted to be passed to .cmm builds as well as C
builds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7cedd9d74e51ae9704802af6eb4775a16e59039">d7cedd9d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:48:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Drop -Werror=unused-but-set-variable from GHC flags
Previously `hadrian` would pass `-optc-Werror=unused-but-set-variable`
to all GHC invocations. This was a difference from the make build system
and cause the unregisterised build to fail as the C that GHC produces
contains many unused functions. Drop it from the GHC flags.
Note, however, that the flag is still present in
`Settings.Builders.Common.cWarnings` and therefore will still be applied
during compilation of C sources.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d3a15c7afa25f32ba3a7570f9174aeeedb90bef">7d3a15c7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:48:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Fix open-file locking
The OFD locking path introduced in
3b784d440d4b01b4c549df7c9a3ed2058edfc780 due to #13945 appears to have
never actually worked but we never noticed due to an oversight in the
autoconf check. Fix it.
Thanks to Oleg Grenrus for noticing this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78b70e63f94f77f56ce2b51786cc394ba2351f9b">78b70e63</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:48:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Split up file locking implementation
This makes the CPP significantly easier to follow.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/639773984180bf3e1a9855b1bdbde469cab2cf27">63977398</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:49:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't substitute GccVersion variable
Not only is it now unused but we generally can't assume that we are
compiling with GCC, so it really shouldn't be used.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72f7ac9ad66b886f4ea9569446e20aa4f97890e4">72f7ac9a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T03:50:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Replace freebsd-gnueabihf with freebsd"
This reverts commit aa31ceaf7568802590f73a740ffbc8b800096342 as
suggested in #17392.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c0372d6bce9c1d580efdfff148e922a6519db08">3c0372d6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T20:31:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">distrib: Fix binary distribution installation
This had silently regressed due to 81860281 and the variable renaming performed
in b55ee979, as noted in #17374.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7f423eedf79fb7379bb666b90ae6bf67edf35b6">a7f423ee</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T20:31:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use pxz to compress binary distributions
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db602643358181567ca4d386e43c6f2c30b193e7">db602643</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T20:31:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't include settings file in binary distribution
The configuration in the installation environment (as determined by
`autoconf`) may differ from the build environment and therefore we
need to be sure to rebuild the settings file.
Fixes #17374.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/260e2379f274759817514c678b3cd1c71a38f939">260e2379</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-29T20:31:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix binary distribution testing
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01ef3e1fe9cbe0ec7d3f00664aa9b9135c825c7d">01ef3e1f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-29T20:32:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Interpreter: initialize arity fields of AP_NOUPDs
AP_NOUPD entry code doesn't use the arity field, but not initializing
this field confuses printers/debuggers, and also makes testing harder as
the field's value changes randomly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93ff91978be67920c7e3657c077ca14c5d6c09bc">93ff9197</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-30T07:36:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: More aarch64 header fixes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e7569bcd4a88ba45d2c40b0904c587c2edf4972">3e7569bc</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-10-30T07:36:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Whitespace forward compatibility for proposal #229
GHC Proposal #229 changes the lexical rules of Haskell, which may
require slight whitespace adjustments in certain cases.
This patch changes formatting in a few places in GHC and its testsuite
in a way that enables it to compile under the proposed rules.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4898df1cc25132dc9e2599d4fa4e1bbc9423cda5">4898df1c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-30T18:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix the ARMv7 triple
Previously we were configuring the ARMv7 builds with a host/target
triple of arm-linux-gnueabihf, which caused us to target ARMv6 and
consequently rely on the old CP15 memory barrier implementation. This
barrier has to be emulated on ARMv8 machines which is glacially slow.
Hopefully this should fix the ARMv7 builds which currently consistently
time out.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/337e9b5adb58cf1a8c4daf76ac286126f2871ad7">337e9b5a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-10-31T19:01:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove redundant 0s in ghc-heap pointer strings
Before: 0x0000004200c86888
After: 0x42000224f8
This is more concise and consistent with the RTS's printer (which uses
%p formatter, and at least on Linux gcc prints the short form) and gdb's
pointer formatter.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97b6f7a3969ad128f94e872f7389ccc790334d9c">97b6f7a3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-31T19:02:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Clamp IO operation size to 2GB on Darwin
As reported in #17414, Darwin throws EINVAL in response to large
writes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9743eb7e9a7bc6b406eb5e3beb69c00f0e90b94">a9743eb7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-31T19:02:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17414
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73d6e508e6ce0b66bd082419effc0010b1dc9668">73d6e508</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-10-31T19:03:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Various haddock fixes
Just a few things I found while looking at #17383.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc4876421386b406dd43a6015f09d92c3e9fb7d8">dc487642</a></strong>
<div>
<span>by taylorfausak</span>
<i>at 2019-11-01T04:54:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement `round` for `Ratio` that doesn't explode with `Natural`s</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3932fb97f59d78a91aaf99e7ea3ae04e6a5a10ea">3932fb97</a></strong>
<div>
<span>by taylorfausak</span>
<i>at 2019-11-01T04:54:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix rounding around 0</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/baf47ff84f5fce832f7173febcac6d9b6b32631a">baf47ff8</a></strong>
<div>
<span>by taylorfausak</span>
<i>at 2019-11-01T04:54:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for rounding ratios</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/214d81220d89ba76350a0eefa837c90797298595">214d8122</a></strong>
<div>
<span>by taylorfausak</span>
<i>at 2019-11-01T04:54:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix running of ratio test case</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70b62c97622f6527cf606af052fb1f0f14783b28">70b62c97</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-01T04:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">mmap: Factor out protection flags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6759080a91804266feb0e4e3a2c614f330649f5">c6759080</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-01T04:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Make m32 allocator per-ObjectCode
MacOS Catalina is finally going to force our hand in forbidden writable
exeutable mappings. Unfortunately, this is quite incompatible with the
current global m32 allocator, which mixes symbols from various objects
in a single page. The problem here is that some of these symbols may not
yet be resolved (e.g. had relocations performed) as this happens lazily
(and therefore we can't yet make the section read-only and therefore
executable).
The easiest way around this is to simply create one m32 allocator per
ObjectCode. This may slightly increase fragmentation for short-running
programs but I suspect will actually improve fragmentation for programs
doing lots of loading/unloading since we can always free all of the
pages allocated to an object when it is unloaded (although this ability
will only be implemented in a later patch).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35c99e720ddbb3ce1355d63c9fb68ef156b9f586">35c99e72</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-11-01T04:56:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Makes Lint less chatty:
I found in #17415 that Lint was printing out truly gigantic
warnings, unmanageably huge, with repeated copies of the
same thing.
This patch makes Lint less chatty, especially for warnings:
* For **warnings**, I don't print details of the location,
unless you add `-dppr-debug`.
* For **errors**, I still print all the info. They are fatal
and stop exection, whereas warnings appear repeatedly.
* I've made much less use of `AnExpr` in `LintLocInfo`;
the expression can be gigantic.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2471964ef06219811c03c2ed0710f9ff98e97ef">d2471964</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-11-01T04:56:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add another test for #17267
This one came in a comment from James Payor
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1e2e82aaaebec837368708b82f62b3c41932e88e">1e2e82aa</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-11-01T04:57:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a bad error in tcMatchTy
This patch fixes #17395, a very subtle and hard-to-trigger
bug in tcMatchTy. It's all explained in
Note [Matching in the presence of casts (2)]
I have not added a regression test because it is very hard
to trigger it, until we have the upcoming mkAppTyM patch,
after which lacking this patch means you can't even compile
the libraries.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/51067194e03849eb0c04e1dbaf829972ea64be53">51067194</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-01T15:48:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Ensure that failIO isn't SOURCE imported
failIO has useful information in its demand signature (specifically that
it bottoms) which is hidden if it is SOURCE imported, as noted
in #16588. Rejigger things such that we don't SOURCE import it.
Metric Increase:
T13701
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c751082ca0946f8686453fa2a775809fd027c9c7">c751082c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-01T15:48:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Make ExplicitForAllRules1 more robust
Previously the test relied on `id` not inlining. Fix this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dab12c8780fe1e6e3c2adb1c9565e2a43aa207db">dab12c87</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-01T15:48:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Describe optimisation of demand analysis of noinline
As described in #16588.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9236384e5aaa50e188f2b8549d61c0a20d1af86">c9236384</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2019-11-01T15:49:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">template-haskell: require at least 1 GADT constructor name (#17379)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4ce26e0dbbd736b4106c3d30979ae0058922a06">a4ce26e0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-01T15:49:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Make runtest invocation consistency with Make
Use True/False instead of 0/1. This shouldn't be a functional change but
we should be consistent.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cabafe34156acb80cd9a918363b2a342fb0c8e66">cabafe34</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-01T15:50:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17423
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a6d3d68f2ce97c1f231eede3819299a0fd2b9c8">4a6d3d68</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-11-01T23:11:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make CSE delay inlining less
CSE delays inlining a little bit, to avoid losing vital
specialisations; see Note [Delay inlining after CSE] in CSE.
But it was being over-enthusiastic. This patch makes the
delay only apply to Ids with specialisation rules, which
avoids unnecessary delay (#17409).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01006bc79582616c9bbc842b397e85437a57ac18">01006bc7</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2019-11-01T23:12:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc: Fix backticks
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9980fb58f613ee3363c7e4cb86453e542c6c69aa">9980fb58</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2019-11-01T23:12:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add +RTS --disable-delayed-os-memory-return. Fixes #17411.
Sets `MiscFlags.disableDelayedOsMemoryReturn`.
See the added `Note [MADV_FREE and MADV_DONTNEED]` for details.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/182b119943d34e82f67525c4b2390557f060c5f9">182b1199</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-02T20:16:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Separate `LPat` from `Pat` on the type-level
Since the Trees That Grow effort started, we had `type LPat = Pat`.
This is so that `SrcLoc`s would only be annotated in GHC's AST, which is
the reason why all GHC passes use the extension constructor `XPat` to
attach source locations. See #15495 for the design discussion behind
that.
But now suddenly there are `XPat`s everywhere!
There are several functions which dont't cope with `XPat`s by either
crashing (`hsPatType`) or simply returning incorrect results
(`collectEvVarsPat`).
This issue was raised in #17330. I also came up with a rather clean and
type-safe solution to the problem: We define
```haskell
type family XRec p (f :: * -> *) = r | r -> p f
type instance XRec (GhcPass p) f = Located (f (GhcPass p))
type instance XRec TH f = f p
type LPat p = XRec p Pat
```
This is a rather modular embedding of the old "ping-pong" style, while
we only pay for the `Located` wrapper within GHC. No ping-ponging in
a potential Template Haskell AST, for example. Yet, we miss no case
where we should've handled a `SrcLoc`: `hsPatType` and
`collectEvVarsPat` are not callable at an `LPat`.
Also, this gets rid of one indirection in `Located` variants:
Previously, we'd have to go through `XPat` and `Located` to get from
`LPat` to the wrapped `Pat`. Now it's just `Located` again.
Thus we fix #17330.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c9161621c6e467f53c5d4649a3c54b3cb40fbf9">3c916162</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-11-02T20:17:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Note references -- comments only
Follow-on from !2041.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b65655c4cef5407829ed41707c48be2f8b3b340">3b65655c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-04T03:40:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Only apply Windows-specific workaround on Windows
Issue #1110 was apparently due to a bug in Vista which prevented GCC
from finding its binaries unless we explicitly added it to PATH.
However, this workaround was incorrectly applied on non-Windows
platforms as well, resulting in ill-formed PATHs (#17266).
Fixes #17266.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5d4f16eed151caddf4624ff0a1fc23d5a4475957">5d4f16ee</a></strong>
<div>
<span>by Leif Metcalf</span>
<i>at 2019-11-04T03:41:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rephrase note on full-laziness
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/120f2e5343d5ccd3ad117d530018b75302c6482b">120f2e53</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-04T03:41:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Ensure that code isn't writable
For many years the linker would simply map all of its memory with
PROT_READ|PROT_WRITE|PROT_EXEC. However operating systems have been
becoming increasingly reluctant to accept this practice (e.g. #17353
and #12657) and for good reason: writable code is ripe for exploitation.
Consequently mmapForLinker now maps its memory with
PROT_READ|PROT_WRITE. After the linker has finished filling/relocating
the mapping it must then call mmapForLinkerMarkExecutable on the
sections of the mapping which contain executable code.
Moreover, to make all of this possible it was necessary to redesign the
m32 allocator. First, we gave (in an earlier commit) each ObjectCode its
own m32_allocator. This was necessary since code loading and symbol
resolution/relocation are currently interleaved, meaning that it is not
possible to enforce W^X when symbols from different objects reside in
the same page.
We then redesigned the m32 allocator to take advantage of the fact that
all of the pages allocated with the allocator die at the same time
(namely, when the owning ObjectCode is unloaded). This makes a number of
things simpler (e.g. no more page reference counting; the interface
provided by the allocator for freeing is simpler). See
Note [M32 Allocator] for details.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c28087a479e5ce0d3113aa4ebb9068d9e2a5a7b">7c28087a</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-11-05T02:45:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Improve documentaion of CPP extension
Currently, the description of CPP extension is given in the section of
command-line options.
Therefore, it is a little difficult to understand that it is a language
extension.
This commit explicitly adds a description for it.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57059f72ed9a34f0589beac4feb41f8738dfdea">d57059f7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-05T02:46:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add missing const in HEAP_ALLOCED_GC
This was previously unnoticed as this code-path is hit on very few
platforms (e.g. OpenBSD).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/487ede425bd0ef958481f0ca0b9614d362e10972">487ede42</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2019-11-05T02:46:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: skip test requiring RTS linker on PowerPC
The RTS linker is not available on 64-bit PowerPC. Instead of
marking tests that require the RTS linker as broken on PowerPC
64-bit skip the respective tests on all platforms where the
RTS linker or a statically linked external interpreter is not
available.
Fixes #11259
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1593debf54ab40708e1c1224c656752d4ccd1ffa">1593debf</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-05T11:38:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Check EmptyCase by simply adding a non-void constraint
We can handle non-void constraints since !1733, so we can now express
the strictness of `-XEmptyCase` just by adding a non-void constraint
to the initial Uncovered set.
For `case x of {}` we thus check that the Uncovered set `{ x | x /~ ⊥ }`
is non-empty. This is conceptually simpler than the plan outlined in
#17376, because it talks to the oracle directly.
In order for this patch to pass the testsuite, I had to fix handling of
newtypes in the pattern-match checker (#17248).
Since we use a different code path (well, the main code path) for
`-XEmptyCase` now, we apparently also handle #13717 correctly.
There's also some dead code that we can get rid off now.
`provideEvidence` has been updated to provide output more in line with
the old logic, which used `inhabitationCandidates` under the hood.
A consequence of the shift away from the `UncoveredPatterns` type is
that we don't report reduced type families for empty case matches,
because the pretty printer is pure and only knows the match variable's
type.
Fixes #13717, #17248, #17386
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6ffe148a17c93e05b410cb49bcc868f9d72c807">e6ffe148</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-05T11:39:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TidyPgm: replace an explicit loop with mapAccumL
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7460492393142ad49244af512053c12296bf7eb">b7460492</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-05T11:39:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CoreTidy: hide tidyRule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9978f5362de07a44f02fa202444c20638fbb63e">f9978f53</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-11-05T11:39:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: enable interpreter for s390x
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ce18700f80a12c48a029b49c6201ad2410071bb">3ce18700</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-06T08:05:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Drop redundant flags for libffi
These are now handled in the cabal file's include-dirs field.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce9e2a1a9307bf43ead278dd1fc8db4325d82340">ce9e2a1a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-06T08:05:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Add --with-libdw-{includes,libraries} flags
Fixing #17255.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97f9674b59e65932737b978a201aaf24a0894ad3">97f9674b</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-11-06T08:06:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Add checking python3-sphinx
This checks the configuration about python3-sphinx.
We need python3-sphinx instead of python2-sphinx to build documentation.
The approach is as follows:
* Check python3 version with custom `conf.py` invoked from
sphinx-build` executable
* Place custom `conf.py` into new `utils/check-sphinx` directory
If sphinx is for python2 not python3, it's treated as config ERROR
instead of WARN.
See also #17346 and #17356.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4fb232892ec420059e767bbf464bd09361aaefa">b4fb2328</a></strong>
<div>
<span>by Dan Brooks</span>
<i>at 2019-11-06T08:07:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Adding examples to Semigroup/monoid
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/708c60aa144ed68a5b67a61f16539258dbcdb24e">708c60aa</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-11-07T08:39:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up TH's treatment of unary tuples (or, #16881 part two)
!1906 left some loose ends in regards to Template Haskell's treatment
of unary tuples. This patch ends to tie up those loose ends:
* In addition to having `TupleT 1` produce unary tuples, `TupE [exp]`
and `TupP [pat]` also now produce unary tuples.
* I have added various special cases in GHC's pretty-printers to
ensure that explicit 1-tuples are printed using the `Unit` type.
See `testsuite/tests/th/T17380`.
* The GHC 8.10.1 release notes entry has been tidied up a little.
Fixes #16881. Fixes #17371. Fixes #17380.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a424229da7cdf2ffca910ee0dd2af250f62ba5c3">a424229d</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-11-07T08:40:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">For s390x issue a warning if LLVM 9 or older is used
For s390x the GHC calling convention is only supported since LLVM
version 10. Issue a warning in case an older version of LLVM is used.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55bc378721c66679d718f12655720be8d3425d67">55bc3787</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T08:40:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FlagChecker: Add ticky flags to hashed flags
These affect output and therefore should be part of the flag hash.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa0b1b4b38492d6c640704874de91298a4567613">fa0b1b4b</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-11-07T08:41:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump libffi-tarballs submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a956663291435cbcb3ad7bc5db01597e8604063a">a9566632</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2019-11-07T08:42:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Modify ERROR to WARN for sphinx's python check
If sphinx's python version check failed, many people prefer to build
without documents instead of stopping on the error.
So this commit fixes the following:
* Modify AC_MSG_ERROR to AC_MSG_WARN
* Add clearing of SPHINXBUILD variable when check fails
See also !2016.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0ef83123e466365f5362b76d691bec489ffe94c">d0ef8312</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-11-07T21:24:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: fix support for the recording of perf test results
Before this patch, Hadrian didn't care about the TEST_ENV and
METRICS_FILE environment variables, that the performance testing
infrastructure uses to record perf tests results from CI jobs.
It now looks them up right before running the testsuite driver,
and passes suitable --test-env/--metrics-file arguments when
these environment variables are set.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/601e554c024874da828ad835898d165642bc5cd5">601e554c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T21:25:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump the process submodule
This should fix the #17108 and #17249 with the fix from
https://github.com/haskell/process/pull/159.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6b7d7e1c484cebe01014f4fa67abb48cacdd54f9">6b7d7e1c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T21:25:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b1c158c9654d033dfe39bb042ec5d4d39a272298">b1c158c9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T21:25:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix m32 allocator build on Windows
An inconsistency in the name of m32_allocator_flush caused the build to
fail with a missing prototype error.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae431cf4f3bf4ee46098f4dfad1d9f2ccbc7a251">ae431cf4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T21:25:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Ensure that Rts.h is always included first
In general this is the convention that we use in the RTS. On Windows
things actually fail if we break it. For instance, you see things like:
includes\stg\Types.h:26:9: error:
warning: #warning "Mismatch between __USE_MINGW_ANSI_STDIO
definitions. If using Rts.h make sure it is the first header
included." [-Wcpp]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d141d28cf6632d1bd0ca1aaf0f302121a3fa3a2">0d141d28</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T21:25:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Remove undesireable inline specifier
I have no idea why I marked this as inline originally but clearly it
shouldn't be inlined.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/870376f900f5024c782a0cb1f324462a985f017a">870376f9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T21:25:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Add missing imports in Windows locking implementation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/23994738f2d40816a2a60d717dd5d5e939f05c66">23994738</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T21:25:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/NonMoving: Fix various Windows build issues
The Windows build seems to be stricter about not providing threading
primitives in the non-threaded RTS.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a3ce52fd5704247de2360f0e8423834113fe3a71">a3ce52fd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-07T21:25:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users_guide: Set flags list file encoding
Otherwise this fails on Windows.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9db2e905f974f6b6dae74cb5157c497e056d24f2">9db2e905</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-11-08T05:36:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: Introduce req_rts_linker
Some tests depend on the RTS linker. Introduce a modifier to skip such
tests, in case the RTS linker is not available.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a46313352280d6c28ee505e0f63ade11077ef7c6">a4631335</a></strong>
<div>
<span>by Szymon Nowicki-Korgol</span>
<i>at 2019-11-08T05:37:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Set correct length of DWARF .debug_aranges section (fixes #17428)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3db2ab306d56582ac4d7600755393bf2e52a86cf">3db2ab30</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-08T05:38:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add enableTickyGhc helper
This took a bit of trial-and-error to get working so it seems worth
having in the tree.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5c87ebd7b24db75c64443a708f6005ecad3b763e">5c87ebd7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-08T12:09:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SetLevels: Don't set context level when floating cases
When floating a single-alternative case we previously would set the
context level to the level where we were floating the case. However,
this is wrong as we are only moving the case and its binders. This
resulted in #16978, where the disrepancy caused us to
unnecessarily abstract over some free variables of the case body,
resulting in shadowing and consequently Core Lint failures.
(cherry picked from commit a2a0e6f3bb2d02a9347dec4c7c4f6d4480bc2421)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/43623b0980cd5c72686f9480e7de14f886b851ad">43623b09</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-08T12:10:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Run tests in nonmoving_thr in speed==slow
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e4656cc95ad504a42080bcaf8afc80fec7be2d6">6e4656cc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-08T12:10:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/nonmoving: Catch failure of createOSThread
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e4fc04b23c41673ef93742cc6c76fe571914a19">2e4fc04b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-08T12:10:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump unix submodule
Marks executeFile001 as broken in all concurrent ways.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a10f9fbe40ca7692bd58373a4f9d2db19bfa81d">8a10f9fb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">template-haskell: Document assembler foreign file support
See #16180.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ad3cb53cb9eaee8d5af340edee83d41e3ac2506">5ad3cb53</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">template-haskell: Fix TBAs in changelog
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a75a83223176f1426a7e45b4b4ba6d946597cde">4a75a832</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Fix TBA in changelog
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7de0d81924c7475b14f87a9427497b318653e91">d7de0d81</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-11-09T18:03:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">template-haskell: Fix italics in changelog
[ci-skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fb246c3ec799eb18b9cbf267f24283d1dc88ca8">0fb246c3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix Windows cleanup path
This was a regression introduced with the Path refactoring.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/925fbdbb184aa587a5a6ee61162ab6dff5131559">925fbdbb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip T16916 on Windows
The event manager is not supported on Windows.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c2ce0a03eb18deb3b255c1f39df89081a772e93">7c2ce0a0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip T14931 on Windows
This test uses -dynamic-too, which is not supported on Windows.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c63edb4959037b9c2912ad4a75465d24907d75d">7c63edb4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Don't allow Windows make job to fail
While linking is still slow (#16084) all of the correctness issues which were
preventing us from being able to enforce testsuite-green on Windows are now
resolved.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a50ecda625823e1a80f32d1313a379f77f877153">a50ecda6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix header #include order on Windows
<Rts.h> must always come first.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcb23ec96917bdb07951508f4c1c5eb71a2d4603">dcb23ec9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T13676 as broken on Darwin and Windows
Due to #17447.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/411ba7baafa8a3e0428b51f35189e0dc5d34d76c">411ba7ba</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T11627b as fragile
It was previously marked as broken due to #12236 however it passes for
me locally while failing on CI.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1f1f3f9f192671c58406d3ba416ba49c997fb8b">c1f1f3f9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T16219 as unbroken
This was previously broken due to #16386 yet it passes for me locally.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f871e708458f3ff4b210d6a7692308cf61b477d">1f871e70</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Remove redundant cleaning logic from T16511
The GHCi script for T16511 had some `rm` commands to clean up output
from previous runs. This should be harmless since stderr was redirected
to /dev/null; however, it seems that this redirection doesn't work on
Windows (perhaps because GHCi uses `cmd` to execute the command-line;
I'm not sure). I tried to fix it but was unable to find a sensible
solution.
Regardless, the cleaning logic is quite redundant now that we run each
test in a hermetic environment. Let's just remove it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d523cb142f69e91b0ff2d0f8f98bdded20cba9a">4d523cb1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T17414 as fragile on Windows
This consistently times out on Windows as described in #17453. I have tried
increasing the timeout multiplier to two yet it stills fails. Disabling
until we have time to investigate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f73fbd2dac42b6f9e9c12de0134bce1298763894">f73fbd2d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Ignore stderr in PartialDownsweep
As described in #17449, PartialDownsweep is currently fragile due to its
dependence on the error messages produced by the C preprocessor. To eliminate
this dependence we simply ignore stderr output, instead relying on the fact
that the test will exit with a non-zero exit code on failure.
Fixes #17449.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9b147907b69d7c5a71644f3fcba6dec3fc632f6">a9b14790</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix putStrLn in saks028
Bizarrely, `saks028` previously failed reliably, but only on Windows
(#17450). The test would exit with a zero exit code but simply didn't
emit the expected text to stderr.
I believe this was due to the fact that the test used `putStrLn`,
resulting in the output ending up on stdout. This worked on other
platforms since (apparently) we redirect stdout to stderr when
evaluating splices. However, on Windows it seems that the redirected
output wasn't flushed as it was on other platforms.
Anyways, it seems like the right thing to do here is to be explicit
about our desire for the output to end up on stderr.
Closes #17450.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b62ca6590ccf1797c21171f7cdde9f272e56ca9e">b62ca659</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Drop T7995
This test is quite sensitive to the build configuration as it requires that ghc
have unfoldings, which isn't true in the quick build flavours. I considered
various options to make the test more robust but none of them seemed
particularly appealing. Moreover, Simon PJ was a bit skeptical of the value of
the test to begin with and I strongly suspect that any regression in #7995
would be accompanied by failures in our other compiler performance tests.
Closes #17399.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/011f3121955cf08353e384e9b84ed387860ade45">011f3121</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-09T18:03:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T16219 as fragile on Windows
As noted in #17452, this test produces very long file paths which
exceed the Windows MAX_PATH limitation. Mark the test as fragile for not
until we can come up with a better solution.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f98e47df40ae84423283bf2e06ffe7a0b4a9381">1f98e47d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-11-09T18:04:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use the right type in :force
A missing prime meant that we were considering the wrong
type in the GHCi debugger, when doing :force on multiple
arguments (issue #17431).
The fix is trivial.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f911de4c73d119be58c7868d0af060055ab447d">1f911de4</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-11-09T18:04:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add IsList instance for ZipList (closes #17433)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3672f401507fbb0803e97dde2e298552a3cac19">e3672f40</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-11-09T18:04:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Incorporate MR review suggestions; add change in changelog
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3957bdf22ca9b813c6253edbf9743254f706eb15">3957bdf2</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-11-09T18:04:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix incorrect plurals
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f4c125017aa39dee3701134ac2a4882525f8471">6f4c1250</a></strong>
<div>
<span>by Alina Banerjee</span>
<i>at 2019-11-10T01:06:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve SPECIALIZE pragma error messages (Fixes #12126)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa25c8c49464c3306b8c166fecc2bf5686d21996">fa25c8c4</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-11-10T01:06:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update release notes about #16512 / #17405.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55ca10855713f3cc14b17f1b67f14c36dea4c651">55ca1085</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-11-10T01:06:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17405 by not checking imported equations
Previously, we checked all imported type family equations
for injectivity. This is very silly. Now, we check only
for conflicts.
Before I could even imagine doing the fix, I needed to untangle
several functions that were (in my opinion) overly complicated.
It's still not quite as perfect as I'd like, but it's good enough
for now.
Test case: typecheck/should_compile/T17405
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9467f4feebc69c2d3cd2742290af1dac454069e">a9467f4f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-10T21:06:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark tests fragile in threaded2 as fragile in all concurrent ways
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e07ea8d120ba4c177341a7e4d2e73fa696a103a">3e07ea8d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-10T21:10:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Use small allocation area when measuring residency
As suggested in #17387; this helps reduce the variance in our residency
sampling.
Metric Increase:
T10370
T3586
lazy-bs-alloc
Metric Decrease 'compile_time/peak_megabytes_allocated':
T1969
Metric Decrease 'runtime/bytes allocated':
space_leak_001
Metric Increase 'compile_time/bytes allocated':
T1969
Metric Increase 'runtime/peak_megabytes_allocated':
space_leak_001
Metric Decrease:
T3064
T9675
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/049d9ae08821fbfcadb2be708f57143ec0efd73b">049d9ae0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-10T21:10:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't check_stats at runtime if not requested
Previously we would call check_stats to check the runtime metrics even
if the test definition hadn't requested it. This would result in an
error since the .stats file doesn't exist.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/644334289eea0dd87380744a271d3b1d27902abb">64433428</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-11-11T08:49:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: export METRICS_FILE to make it accessible to perf notes script
This addresses #17456 and also fixes the --metrics-file argument that Hadrian
passes to the testsuite driver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06640394b9df337978a8e256786c2bc71971c483">06640394</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-11T08:50:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Disable T4334 in nonmoving_thr way
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8ec32d79ff876686cb191151c5a151773ae6495">f8ec32d7</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-11-11T11:36:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci: push perf test metrics even when the testsuite doesn't pass
The corresponding commit might introduce a regression on a perf test, in which
case we certainly want to record it. The testsuite might also fail because
of a test unrelated to performance, in which case we want to record that the
perf test results were good.
Either way, we likely want to record them under all circumstances but
we don't without this patch.
Metric Decrease:
T3586
Metric Increase:
lazy-bs-alloc
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/643d42fcf68f9b96bc8829d20bcd8f5fef84a78c">643d42fc</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-11-12T18:40:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: don't collect compiler stats in collect_runtime_residency
We instead want to collect the runtime stats (with collect_stats, instead of
collect_compiler_stats).
This should fix a number of perf tests failures we have been seeing, where
we suddenly started measuring metrics we didn't intend to measure, which
tend to fall outside of the acceptance window.
Metric Decrease:
lazy-bs-alloc
T3586
Metric Increase:
space_leak_001
T4801
T5835
T12791
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/535d0edc11e66a9a0bdfda676dd614833d86df68">535d0edc</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-13T07:06:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document CmmTopInfo type
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d4f9ad89cb7e79c1f90983bf4898a5f4e3c7457">2d4f9ad8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-13T07:06:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ensure that coreView/tcView are able to inline
Previously an import cycle between Type and TyCoRep meant that several
functions in TyCoRep ended up SOURCE import coreView. This is quite
unfortunate as coreView is intended to be fused into a larger pattern
match and not incur an extra call.
Fix this with a bit of restructuring:
* Move the functions in `TyCoRep` which depend upon things in `Type`
into `Type`
* Fold contents of `Kind` into `Type` and turn `Kind` into a simple
wrapper re-exporting kind-ish things from `Type`
* Clean up the redundant imports that popped up as a result
Closes #17441.
Metric Decrease:
T4334
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b795637fc74ffb3ac2f37a50f25468a67bf54bc0">b795637f</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-11-13T07:07:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: fix Windows CI script
By only using 'export' from within bash commands.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6885e22c83ac34e48a2abdb1958b07904f28eae6">6885e22c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-13T07:08:03-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17458
As noted in #17458, QuantifiedConstraints and UndecideableInstances
could previously be used to write programs which can loop at runtime.
This was fixed in !1870.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4b19d8990f345f8ae7fde130ba84327353433a9">b4b19d89</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-13T07:08:03-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Fix broken link
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a939a6cdfb2a1357f9990af329096dff6b5be5c">9a939a6c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-11-13T07:08:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Print name prefixly in the Outputable instance for StandaloneKindSig
Issue #17461 was occurring because the `Outputable` instance for
standalone kind signatures was simply calling `ppr` on the name in
the kind signature, which does not add parentheses to infix names.
The solution is simple: use `pprPrefixOcc` instead.
Fixes #17461.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a06cfb59d21c9cf6f53a8b1acedb075988a6c5ca">a06cfb59</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-13T07:09:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Only pass mod_location with HscRecomp instead of the entire ModSummary
HscRecomp users only need the ModLocation of the module being compiled,
so only pass that to users instead of the entire ModSummary
Metric Decrease:
T4801
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd49b3f079a4ff59fd9ed0a8ea5585f0fcc0e56a">dd49b3f0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-13T17:01:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Haskeline and add exceptions as boot library
Haskeline now depends upon exceptions. See #16752.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b06b1858f2765f27da2914bd8d17464eeb13d20c">b06b1858</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-14T11:30:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Bump version to 4.14.0.0
Metric Increase:
T4801
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ab80439d0c57b9a3aa03d0d57c5e095257ee2cf">6ab80439</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-14T23:05:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow Windows to fail again
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/46afc380b1445d6bcff0c954569a59420c847534">46afc380</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-15T09:45:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Install process to global pkgdb before starting build
This is an attempt to mitigate #17480 by ensuring that a functional version of
the process library is available before attempting the build.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8c5cb80698da2608f08738822d97cdcb682c5544">8c5cb806</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-15T10:45:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump supported LLVM version to 9.0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e5851f0708134efe0ff0e139a1464337410d0ce">8e5851f0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-15T10:45:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvm-targets: Update with Clang 9
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ffec2729abb4bccaf16e974bef376c8968516e">f3ffec27</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-15T11:54:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Increase acceptance window of T4801
This statistic is rather unstable. Hopefully fixes #17475.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2991f16cb6f5b4e7cff46a394dda4247d973f44">c2991f16</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-15T11:56:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Drop 8.6.1 release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8da1354f0d0cac7b152cff9673f78e5156d4c0c">e8da1354</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-17T06:48:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix submodule linter
We ran it against the .git directory despite the fact that the linter
wants to be run against the repository.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13290f91e10d503078787ed5b8fb0a523358f124">13290f91</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-17T06:48:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump version to 8.10.0
Bumps haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa98f82348b268043dce918e6eb9dab434eb3108">fa98f823</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-17T06:48:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't collect residency for T4801
I previously increased the size of the acceptance window from 2% to 5%
but this still isn't enough. Regardless, measuring bytes allocated
should be sufficient to catch any regressions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/002b284269de63504ed3b0c1e22c8ecfd74e78d9">002b2842</a></strong>
<div>
<span>by Ivan Kasatenko</span>
<i>at 2019-11-17T06:49:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make test 16916 more stable across runs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca89dd3b591f82e73a88cf433d280ece317ace5e">ca89dd3b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-17T06:58:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Address #17329
Adopts the language suggested by @JakobBruenker.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f5ed225b78b32c65d023072d78ae5d176e2f04b">2f5ed225</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-17T07:16:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">exceptions: Bump submodule back to master
The previous commit hasn't made it to master yet.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34515e7c94250a8b5b85453a0481d0c8d313a7c5">34515e7c</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-11-17T13:33:22-08:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix random typos [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a37a29b67db078ba29722c5615a37fd8091989b">4a37a29b</a></strong>
<div>
<span>by Mario Blažević</span>
<i>at 2019-11-17T17:26:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fixed issue #17435, missing Data instances
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97f1bcaeb05f443d267a1a0692ed45e35509e84f">97f1bcae</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2019-11-17T17:26:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Turn some comments into GHC.Hs.Utils into haddocks
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf7f8e5bbec83da1bb62075968bc78c86414c245">cf7f8e5b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-17T17:26:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip T17414 on Linux
It is typical for $TMP to be a small tmpfson Linux. This test will fail
in such cases since we must create a file larger than the filesystem.
See #17459.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88013b784d77c069b7c083244d04a59ac2da2895">88013b78</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-11-19T11:53:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize MonadUnique instances based on IO (#16843)
Metric Decrease:
T14683
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8adb5b4d782b6166160a80adbf6c59452dc964d">a8adb5b4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:53:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">desugar: Drop stale Note [Matching seqId]
The need for this note vanished in
eae703aa60f41fd232be5478e196b661839ec3de.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/08d595c026f0774c51d85cbd790518055970ff2d">08d595c0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:53:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Give seq a more precise type and remove magic
`GHC.Prim.seq` previously had the rather plain type:
seq :: forall a b. a -> b -> b
However, it also had a special typing rule to applications
where `b` is not of kind `Type`.
Issue #17440 noted that levity polymorphism allows us to rather give
it the more precise type:
seq :: forall (r :: RuntimeRep) a (b :: TYPE r). a -> b -> b
This allows us to remove the special typing rule that we previously
required to allow applications on unlifted arguments. T9404 contains a
non-Type application of `seq` which should verify that this works as
expected.
Closes #17440.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ec8a463d1ff948ba9b1b0fbb538f7d5a237bf44a">ec8a463d</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2019-11-19T11:54:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable USE_PTHREAD_FOR_ITIMER also on FreeBSD
If using a pthread instead of a timer signal is more reliable, and
has no known drawbacks, then FreeBSD is also capable of supporting
this mode of operation (tested on FreeBSD 12 with GHC 8.8.1, but
no reason why it would not also work on FreeBSD 11 or GHC 8.6).
Proposed by Kevin Zhang in:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241849
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd40e12ad8072c6b881c6bb650e39e4d29c9718c">cd40e12a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-19T11:55:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Packages.hs: use O(n*log(n)) ordNub instead of O(n*n) nub
As reported in #8173 in some environments package lists can get quite
long, so we use more efficient ordNub instead of nub on package lists.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b27cc164ae5a978a8abd9966d04af74628a5396">2b27cc16</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:56:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Properly account for libdw paths in make build system
Should finally fix #17255.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0418c38d55c7a47967187dce2db5ea2ab1021b1e">0418c38d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:56:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add missing include of SymbolExtras.h
This broke the Windows build.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c819c0e413069cb4e16236fb3e6576658060a17d">c819c0e4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:57:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Use correct info table pointer accessor
Previously we used INFO_PTR_TO_STRUCT instead of
THUNK_INFO_PTR_TO_STRUCT when looking at a thunk. These two happen to be
equivalent on 64-bit architectures due to alignment considerations
however they are different on 32-bit platforms. This lead to #17487.
To fix this we also employ a small optimization: there is only one thunk
of type WHITEHOLE (namely stg_WHITEHOLE_info). Consequently, we can just
use a plain pointer comparison instead of testing against info->type.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/deed8e310cecb2491e5c333afc58cb720a39b565">deed8e31</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:57:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix incorrect masking in mark queue type test
We were using TAG_BITS instead of TAG_MASK. This happened to work on
64-bit platforms where TAG_BITS==3 since we only use tag values 0 and
3. However, this broken on 32-bit platforms where TAG_BITS==2.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/097f807214d5f4422a1d2cbacd8bc89908eddbdb">097f8072</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:57:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Rework mark queue representation
The previous representation needlessly limited the array length to
16-bits on 32-bit platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb7b233a3db9f3958bdf8d8eb6c76c6d9f00f5b9">eb7b233a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:57:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix handling on large object marking on 32-bit
Previously we would reset the pointer pointing to the object to be
marked to the beginning of the block when marking a large object. This
did no harm on 64-bit but on 32-bit it broke, e.g. `arr020`, since we
align pinned ByteArray allocations such that the payload is 8
byte-aligned. This means that the object might not begin at the
beginning of the block.,
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7571a74df15585a48318267a3f8e995fa1270b2">a7571a74</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:57:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Increase width of stack003 test
Previously the returned tuple seemed to fit in registers on amd64. This
meant that non-moving collector bug would cause the test to fail on i386
yet not amd64.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/098d50176a2521d08efe6fdbab0ede2b7419786a">098d5017</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-19T11:57:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Drop redundant write barrier on stack underflow
Previously we would push stack-carried return values to the new stack on
a stack overflow. While the precise reasoning for this barrier is
unfortunately lost to history, in hindsight I suspect it was prompted by
a missing barrier elsewhere (that has been since fixed).
Moreover, there the redundant barrier is actively harmful: the stack may
contain non-pointer values; blindly pushing these to the mark queue will
result in a crash. This is precisely what happened in the `stack003`
test. However, because of a (now fixed) deficiency in the test this
crash did not trigger on amd64.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e57b7cc6d8b1222e0939d19c265b51d2c3c2b4c0">e57b7cc6</a></strong>
<div>
<span>by Roland Zumkeller</span>
<i>at 2019-11-19T20:39:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Changing Thread IDs from 32 bits to 64 bits.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1f3c63701b7f0fd675f792af7f33c5b11eaff83">d1f3c637</a></strong>
<div>
<span>by Roland Zumkeller</span>
<i>at 2019-11-19T20:39:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use pointer equality in Eq/Ord for ThreadId
Changes (==) to use only pointer equality. This is safe because two
threads are the same iff they have the same id.
Changes `compare` to check pointer equality first and fall back on ids
only in case of inequality.
See discussion in #16761.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef8a08e0dd4e5b908b7fbce1b3101dc311c4d3e1">ef8a08e0</a></strong>
<div>
<span>by Alexey Kuleshevich</span>
<i>at 2019-11-19T20:39:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hpc: Fix encoding issues. Add test for and fix #17073
* Make sure files are being read/written in UTF-8. Set encoding while writing
HTML output. Also set encoding while writing and reading .tix files although
we don't yet have a ticket complaining that this poses problems.
* Set encoding in html header to utf8
* Upgrade to new version of 'hpc' library and reuse `readFileUtf8`
and `writeFileUtf8` functions
* Update git submodule for `hpc`
* Bump up `hpc` executable version
Co-authored-by: Ben Gamari <ben@smart-cactus.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b79e46d682d144c6a7a9ff6e7dca0d892b690654">b79e46d6</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-11-19T20:39:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Strip parentheses in expressions contexts in error messages
This makes error messages a tad less noisy.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13bbde77ecba66c6dd960f948d726aed62c583aa">13bbde77</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-21T13:56:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
Including Phyx's backport of the process changes fixing #17480.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d4d10501c6ec995711d626eead58b84bf413d0b3">d4d10501</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-23T09:42:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule again
This fixes the Darwin build.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/889d475bca24254a42ec1178a6d68caaa4eec678">889d475b</a></strong>
<div>
<span>by nineonine</span>
<i>at 2019-11-23T18:53:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in Note reference [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a33abfcdf5a3ae9ae1777b92891890d6a045f8b">8a33abfc</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-11-23T18:54:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Target the IsList instance for ZipList at base-4.14.0.0 (#17489)
This moves the changelog entry about the instance from
`base-4.15.0.0` to `base-4.14.0.0`. This accomplishes part (1)
from #17489.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e43e6ece1418f84e50d572772394ab639a083e79">e43e6ece</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-23T18:54:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Expose interface for configuring EventLogWriters
This exposes a set of interfaces from the GHC API for configuring
EventLogWriters. These can be used by consumers like
[ghc-eventlog-socket](https://github.com/bgamari/ghc-eventlog-socket).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de6bbdf27f1831818598c7b334cb5b247aa97af7">de6bbdf2</a></strong>
<div>
<span>by Matheus Magalhães de Alcantara</span>
<i>at 2019-11-23T18:55:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Take care to not eta-reduce jumps in CorePrep
CorePrep already had a check to prevent it from eta-reducing Ids that
respond true to hasNoBinding (foreign calls, constructors for unboxed
sums and products, and Ids with compulsory unfoldings). It did not,
however, consider join points as ids that 'must be saturated'.
Checking whether the Id responds True to 'isJoinId' should prevent
CorePrep from turning saturated jumps like the following (from #17429)
into undersaturated ones:
(\ eta_XP ->
join { mapped_s1vo _ = lvl_s1vs } in jump mapped_s1vo eta_XP)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a1e7e47f797fab4165b7cba05edc08d41f5d80e">4a1e7e47</a></strong>
<div>
<span>by Matheus Magalhães de Alcantara</span>
<i>at 2019-11-23T18:55:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make CorePrep.tryEtaReducePrep and CoreUtils.tryEtaReduce line up
Simon PJ says he prefers this fix to #17429 over banning eta-reduction
for jumps entirely. Sure enough, this also works.
Test case: simplCore/should_compile/T17429.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15f1dc3316db0b07434862de8382b4ddd27fecca">15f1dc33</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-11-23T18:56:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Prevent -optc arguments from being duplicated in reverse order (#17471)
This reverts a part of commit
7bc5d6c6578ab9d60a83b81c7cc14819afef32ba that causes all arguments
to `-optc` (and `-optcxx`) to be passed twice to the C/C++ compiler,
once in reverse order and then again in the correct order. While
passing duplicate arguments is usually harmless it can cause breakage
in this pattern, which is employed by Hackage libraries in the wild:
```
ghc Foo.hs foo.c -optc-D -optcFOO
```
As `FOO -D -D FOO` will cause compilers to error.
Fixes #17471.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e85c9b22e94cdc31d59ffc5ff72fcb5b4597d683">e85c9b22</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-23T18:56:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump ghc version to 8.11
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e6c204570f77950c9019faa50ff867c158249c5">0e6c2045</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-23T18:57:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Consolidate spinlock implementation
Previously we had two distinct implementations: one with spinlock
profiling and another without. This seems like needless duplication.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb11fcb52ce8d5d1473a380db5fc0d32bf8ae75c">cb11fcb5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-23T18:57:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Packages: Don't use expectJust
Throw a slightly more informative error on failure. Motivated by the
errors seen in !2160.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5747ebe9bc9b2936e9bdae0cb752124c42d069d5">5747ebe9</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-23T18:58:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Stricten functions ins GHC.Natural
This brings `Natural` on par with `Integer` and fixes #17499.
Also does some manual CSE for 0 and 1 literals.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c14b723f7fa24b4db0b561f9ab0d6e0f4261fd2f">c14b723f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-23T18:59:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump exceptions submodule
Adds a few files generated by GHC's configure script to .gitignore
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b4c7b75be351e9b6a40093cbccab728dd89064f">7b4c7b75</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-11-23T19:04:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6008206a9e050ed0e3db1f09e0b2a641420d4ffd">6008206a</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2019-11-24T14:33:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">On FreeBSD 12 sys/sysctl.h requires sys/types.h
Else build fails with:
In file included from ExecutablePath.hsc:42:
/usr/include/sys/sysctl.h:1062:25: error: unknown type name 'u_int'; did you mean 'int'?
int sysctl(const int *, u_int, void *, size_t *, const void *, size_t);
^~~~~
int
compiling libraries/base/dist-install/build/System/Environment/ExecutablePath_hsc_make.c failed (exit code 1)
Perhaps also also other FreeBSD releases, but additional include
will no harm even if not needed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b694b5662f8c9915b1a9d072cd530cd29124194a">b694b566</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-11-24T14:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix HAVE_C11_ATOMICS macro
Previously we were using AC_DEFINE instead of
AC_DEFINE_UNQUOTED, resulted in the variable not being
interpolated.
Fixes #17505.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b8dc36653878de5556e368bd3e93abf66f839e9">8b8dc366</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-11-25T14:37:38+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove prefix arrow support for GADTs (#17211)
This reverts the change in #9096.
The specialcasing done for prefix (->) is brittle and
does not support VTA, type families, type synonyms etc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a08f7d405bbedfdc20c07f64726899f594e9d07">5a08f7d4</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-27T00:14:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make warnings for TH splices opt-in
In #17270 we have the pattern-match checker emit incorrect warnings. The
reason for that behavior is ultimately an inconsistency in whether we
treat TH splices as written by the user (`FromSource :: Origin`) or as
generated code (`Generated`). This was first reported in #14838.
The current solution is to TH splices as `Generated` by default and only
treat them as `FromSource` when the user requests so
(-fenable-th-splice-warnings). There are multiple reasons for opt-in
rather than opt-out:
* It's not clear that the user that compiles a splice is the author of the code
that produces the warning. Think of the situation where she just splices in
code from a third-party library that produces incomplete pattern matches.
In this scenario, the user isn't even able to fix that warning.
* Gathering information for producing the warnings (pattern-match check
warnings in particular) is costly. There's no point in doing so if the user
is not interested in those warnings.
Fixes #17270, but not #14838, because the proper solution needs a GHC
proposal extending the TH AST syntax.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8168b42a95ddf37c56958955eef065eb8747470f">8168b42a</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-11-27T11:32:18+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Whitespace-sensitive bang patterns (#1087, #17162)
This patch implements a part of GHC Proposal #229 that covers five
operators:
* the bang operator (!)
* the tilde operator (~)
* the at operator (@)
* the dollar operator ($)
* the double dollar operator ($$)
Based on surrounding whitespace, these operators are disambiguated into
bang patterns, lazy patterns, strictness annotations, type
applications, splices, and typed splices.
This patch doesn't cover the (-) operator or the -Woperator-whitespace
warning, which are left as future work.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e5477c46bbcd3beadd1a67a294056628e394945">9e5477c4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-11-27T20:01:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix @since annotations for isResourceVanishedError and friends (#17488)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e122ba33e8426a7b7f18216c451f6288e90c966e">e122ba33</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2019-11-27T20:02:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">.gitmodules: tweak 'exception' URL to avoid redirection warnings
Avoid initial close warning of form:
```
Cloning into 'exceptions'...
warning: redirecting to https://gitlab.haskell.org/ghc/packages/exceptions.git/
```
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f84b52a9c439ae2739bf1899a2adbae9c6d4f67">5f84b52a</a></strong>
<div>
<span>by Philipp Krüger</span>
<i>at 2019-11-28T02:54:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reduce boolean blindness in OccInfo(OneOcc) #17482
* Transformed the type aliases `InterestingCxt`, `InsideLam` and `OneBranch`
into data types.
* Added Semigroup and Monoid instances for use in orOccInfo in OccurAnal.hs
* Simplified some usage sites by using pattern matching instead of boolean algebra.
Metric Increase:
T12150
This increase was on a Mac-build of exactly 1%. This commit does *not* re-intruduce
the asymptotic memory usage described in T12150.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3748ba3a01f81078025b86023833784055d1af57">3748ba3a</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-11-28T02:54:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos, using Wikipedia list of common typos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c59cc71dc20f26d5a6650b16a82faeae72f2065">6c59cc71</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-11-28T02:55:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix endian handling of LLVM backend
Get rid of CPP macro WORDS_BIGENDIAN which is not defined anymore, and
replace it by DynFlag. This fixes partially #17337.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6985e0fc4f6fb30c1effd356d87c1a0629aa9cd0">6985e0fc</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-11-28T15:47:53+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factor out HsSCC/HsCoreAnn/HsTickPragma into HsPragE
This is a refactoring with no user-visible changes (except for GHC API
users). Consider the HsExpr constructors that correspond to user-written
pragmas:
HsSCC representing {-# SCC ... #-}
HsCoreAnn representing {-# CORE ... #-}
HsTickPragma representing {-# GENERATED ... #-}
We can factor them out into a separate datatype, HsPragE. It makes the
code a bit tidier, especially in the parser.
Before this patch:
hpc_annot :: { Located ( (([AddAnn],SourceText),(StringLiteral,(Int,Int),(Int,Int))),
((SourceText,SourceText),(SourceText,SourceText))
) }
After this patch:
prag_hpc :: { Located ([AddAnn], HsPragE GhcPs) }
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f695a20f5f9fe4952ca8cde45d73f3604a7cc29">7f695a20</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-29T08:25:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass ModDetails with (partial) ModIface in HscStatus
(Partial) ModIface and ModDetails are generated at the same time, but
they're passed differently: ModIface is passed in HscStatus consturctors
while ModDetails is returned in a tuple. This refactors ModDetails
passing so that it's passed around with ModIface in HscStatus
constructors. This makes the code more consistent and hopefully easier
to understand: ModIface and ModDetails are really very closely related.
It makes sense to treat them the same way.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e921c90fec6754414e97bfabaeeb4eaf0241472d">e921c90f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-11-29T08:26:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve few Foreign.Marshal.Utils docs
In copyBytes and moveBytes mention which argument is source and which is
destination.
Also fixes some of the crazy indentation in the module and cleans
trailing whitespace.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/316f24319e151446c83cbb0f2997a73e19fe4aa3">316f2431</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-30T02:57:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian docs: Rename the second "validate" entry to "slow-validate" [ci skip]
That would be in line with the implementation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aba5d3218330f8ce127aa7767efcbb6f63a2db1">5aba5d32</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-11-30T02:58:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove HasSrcSpan (#17494)
Metric Decrease:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1de5c227160f555ea6d5679791388a980910c88">d1de5c22</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-11-30T02:59:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Hadrian by default in validate script (#17527)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a96a0b6db6a32457ae2f91bb711c2481c767656">3a96a0b6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-11-30T02:59:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simpler Semigroup instance for InsideLam and InterestingCtxt
This mirrors the definition of `(&&)` and `(||)` now, relieving the
Simplifier of a marginal amount of pressure.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8cfe81aed556d00eac58e3ad0f5e27c503b636a">f8cfe81a</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-11-30T20:33:49+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve tests for #17171
While backporting MR !1806 to 8.8.2 (!1885) I learnt the following:
* Tests with `expect_fail` do not compare `*.stderr` output files. So a test using `expect_fail` will not detect future regressions on the `stderr` output.
* To compare the `*.stderr` output files, I have to use the `exit_code(n)` function.
* When a release is made, tests with `makefile_test` are converted to use `run_command`.
* For the test `T17171a` the return code is `1` when running `makefile_test`, however it's `2` when running `run_command`.
Therefore I decided:
* To improve my tests for #17171
* To change test T17171a from `expect_fail` to `exit_code(2)`
* To change both tests from `makefile_test` to `run_command`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b113fc957a3fb6eafd10ad41a7caf11009ef4eb">2b113fc9</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-01T08:17:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update DisambECP-related comments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/beed7c3e7c0703089a9ba4321bd3a2e442213fad">beed7c3e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T03:41:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix location of typing_stubs module
This should fix the build on Debian 8.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53251413348186c8fbe2bbe9c2702d274e469324">53251413</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T03:42:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't override LD_LIBRARY_PATH, only prepend
NixOS development environments often require that LD_LIBRARY_PATH
be set in order to find system libraries. T1407 was overriding
LD_LIBRARY_PATH, dropping these directories. Now it merely prepends,
its directory.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65400314244b2486dc4740a4aadd4e1225d38e3c">65400314</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-12-02T03:42:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Convert warnings into assertions
Since the invariants always hold in the testsuite, we can convert
them to asserts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18baed641fccc7fd91988334544d47505b577810">18baed64</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2019-12-02T03:43:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">API Annotations: Unicode '->' on HsForallTy
The code fragment
type family Proxy2' ∷ ∀ k → k → Type where
Proxy2' = Proxy'
Generates AnnRarrow instead of AnnRarrowU for the first →.
Fixes #17519
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/717f323609857a40fdbefe7a5ba426747512414a">717f3236</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2019-12-02T03:44:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix more typos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bde48f8e5bad1427a530610796d85d299997f80c">bde48f8e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:55:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More Haddock syntax in GHC.Hs.Utils
As suggested by RyanGlScott in !2163.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/038bedbc8daa842a4cd91a0da780d09c78c4984f">038bedbc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify: Fix pretty-printing of strictness
A colleague recently hit the panic in Simplify.addEvals and I noticed
that the message is quite unreadable due to incorrect pretty-printing.
Fix this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c500f652470d012fa432632ab122a12674bd9788">c500f652</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix changelog linting logic
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ead967d48b48020f6ce621f9b27363aca45c363">8ead967d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">win32-init: Drop workaround for #17480
The `process` changes have now been merged into `hsc2hs`.
(cherry picked from commit fa029f53132ad59f847ed012d3b835452cf16615)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d402209ace97212b59ad6f9d7cdd1e1bb15fc425">d402209a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable Sphinx build on Debian 8
The docutils version available appears to be too old to support the
`table` directive's `:widths:` options.
(cherry picked from commit 75764487a96a7a026948b5af5022781872d12baa)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1f688244d7a766a2b71fbe172c86e3cb4c87539">f1f68824</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Fix <unistd.h> #include
Previously we were including <sys/unistd.h> which is available on glibc
but not musl.
(cherry picked from commit e44b695ca7cb5f3f99eecfba05c9672c6a22205e)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37eb94b3b060ef83685127ec10d14a9675cf508a">37eb94b3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump Docker images
Installs pxz on Centos7
(cherry picked from commit 86960e691f7a600be247c32a7cf795bf9abf7cc4)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aec98a79a7cc04c3fa8d0f5dfd6cb462daa4e612">aec98a79</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: pxz is unavailable on CentOS 7
Fall back to xz
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6708b8e5b814bf9797e1bbac82622d815e7669b1">6708b8e5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Set LANG on CentOS 7
It otherwise seems to default to ascii
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/470ef0e7d0d6c07b17252a660d72691dd02a1dad">470ef0e7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Consolidate release build configuration
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/38338757e0854a0fc6c3a99d1c35392227623887">38338757</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add Debian 10 builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/012f13b5051ff4385542f90c9692ef4ba6450db9">012f13b5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix Windows bindist collection
Apparently variable interpolation in the `artifacts.paths` key of
`gitlab-ci.yml` doesn't work on Windows as it does on WIndows.
(cherry picked from commit 100cc756faa4468ed6950116bae30609c1c3468b)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0f09e23dd19f0cf223034f9b787a4f038cd995d">a0f09e23</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Simplify Python <3.5 fallback for TextIO
(cherry picked from commit d092d8598694c23bc07cdcc504dff52fa5f33be1)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b2370ec82294c527f9fbe2d1d66daff9816f837">2b2370ec</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add release-x86_64-linux-deb9 job
(cherry picked from commit cbedb3c4a90649f474cb716842ba53afc5a642ca)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b1c206fd58a8ff365d4b28dff41fec343884972b">b1c206fd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-02T11:56:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Always build source tarball
(cherry picked from commit 67b5de88ef923971f1980335137e3c7193213abd)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4cbd5b47a00a29b7835710f1b91bb93ac8e3f790">4cbd5b47</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2019-12-02T11:57:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure.ac: make cross-compiler detection stricter
Be more precise at detecting cross-compilation case.
Before the change configuration
$ ./configure --host=x86_64-pc-linux-gnu --target=x86_64-gentoo-linux-musl
was not considered a cross-target. Even though libcs are different (`glibc` vs. `musl`).
Without this patch build fails as:
```
"inplace/bin/ghc-cabal" check libraries/integer-gmp
"inplace/bin/ghc-cabal" configure libraries/integer-gmp dist-install \
--with-ghc="/home/slyfox/dev/git/ghc/inplace/bin/ghc-stage1" \
--with-ghc-pkg="/home/slyfox/dev/git/ghc/inplace/bin/ghc-pkg" \
--disable-library-for-ghci --enable-library-vanilla --enable-library-for-ghci \
--enable-library-profiling --enable-shared --with-hscolour="/usr/bin/HsColour" \
--configure-option=CFLAGS="-Wall \
-Werror=unused-but-set-variable -Wno-error=inline \
-iquote /home/slyfox/dev/git/ghc/libraries/integer-gmp" \
--configure-option=LDFLAGS=" " --configure-option=CPPFLAGS=" \
" --gcc-options="-Wall -Werror=unused-but-set-variable -Wno-error=inline -iquote /home/slyfox/dev/git/ghc/libraries/integer-gmp \
" --with-gcc="x86_64-gentoo-linux-musl-gcc" --with-ld="x86_64-gentoo-linux-musl-ld.gold" --with-ar="x86_64-gentoo-linux-musl-ar" \
--with-alex="/usr/bin/alex" --with-happy="/usr/bin/happy"
Configuring integer-gmp-1.0.2.0...
configure: WARNING: unrecognized options: --with-compiler
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
checking for gcc... /usr/lib/ccache/bin/x86_64-gentoo-linux-musl-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... configure: error: in `/home/slyfox/dev/git/ghc/libraries/integer-gmp/dist-install/build':
configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details
make[1]: *** [libraries/integer-gmp/ghc.mk:5: libraries/integer-gmp/dist-install/package-data.mk] Error 1
make: *** [Makefile:126: all] Error 2
```
Note: here `ghc-stage1` is assumed to target `musl` target but is passed
`glibc` toolchain. It happens because initial ./configure phase did not
detect host/target as different.
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f7cb423d7703788014b675af0cbbd611d19310b">5f7cb423</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-02T23:59:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add `timesInt2#` primop
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbbe18a274cd094a0582396e83619378a7071386">fbbe18a2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-02T23:59:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use the new timesInt2# primop in integer-gmp (#9431)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a4b8d0cf2ff83d1a04826b9624fffec7b9a5683">5a4b8d0c</a></strong>
<div>
<span>by Athas</span>
<i>at 2019-12-03T00:00:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document RTS behaviour upon encountering '--'.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/705a16df02411ec2445c9a254396a93cabe559ef">705a16df</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T07:11:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make BCO# lifted
In #17424 Simon PJ noted that there is a potentially unsafe occurrence
of unsafeCoerce#, coercing from an unlifted to lifted type. However,
nowhere in the compiler do we assume that a BCO# is not a thunk.
Moreover, in the case of a CAF the result returned by `createBCO` *will*
be a thunk (as noted in [Updatable CAF BCOs]). Consequently it seems
better to rather make BCO# a lifted type and rename it to BCO.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35afe4f3b1591740ab8454ebe4c0ec206d2b7e14">35afe4f3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-03T07:12:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Int# primops in `Bits Int{8,16,32,64}` instances
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a51b587ad6a154f89542641593c2b5b2c3f3dde">7a51b587</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-03T07:12:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add constant folding rule (#16402)
narrowN (x .&. m)
m .&. (2^N-1) = 2^N-1
==> narrowN x
e.g. narrow16 (x .&. 0x12FFFF) ==> narrow16 x
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10caee7fd3f048ead668e8bc70d855d9a55f89a5">10caee7f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T21:04:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Add 8.12.1 release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25019d18109cd620a2cf6ab0e7d417d14935e8a5">25019d18</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T21:04:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Drop Uniquable constraint for AnnTarget
This relied on deriveUnique, which was far too subtle to be safely
applied. Thankfully the instance doesn't appear to be used so let's just
drop it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78b67ad0e891fc3b66df72643fb173dc985e8306">78b67ad0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T21:04:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify uniqAway
This does two things:
* Eliminate all uses of Unique.deriveUnique, which was quite easy to
mis-use and extremely subtle.
* Rename the previous "derived unique" notion to "local unique". This
is possible because the only places where `uniqAway` can be safely
used are those where local uniqueness (with respect to some
InScopeSet) is sufficient.
* Rework the implementation of VarEnv.uniqAway, as discussed in #17462.
This should make the operation significantly more efficient than its
previous iterative implementation..
Metric Decrease:
T9872c
T12227
T9233
T14683
T5030
T12545
hie002
Metric Increase:
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f03a41d4bf9418ee028ecb51654c928b2da74edd">f03a41d4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-03T21:05:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Elf: Fix link info note generation
Previously we would use the `.int` assembler directive to generate
32-bit words in the note section. However, `.int` is note guaranteed to
produce 4-bytes; in fact, on some platforms (e.g. AArch64) it produces
8-bytes. Use the `.4bytes` directive to avoid this.
Moreover, we used the `.align` directive, which is quite platform
dependent. On AArch64 it appears to not even be idempotent (despite what
the documentation claims). `.balign` is consequentially preferred as it
offers consistent behavior across platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84585e5e7c5d729ce38fa47ebaa7518acd14c2f1">84585e5e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-05T16:07:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Meaning-preserving SCC annotations (#15730)
This patch implements GHC Proposal #176:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0176-scc-parsing.rst
Before the change:
1 / 2 / 2 = 0.25
1 / {-# SCC "name" #-} 2 / 2 = 1.0
After the change:
1 / 2 / 2 = 0.25
1 / {-# SCC "name" #-} 2 / 2 = parse error
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e49e54705dee111b64c061a01b1e193d89cf84ed">e49e5470</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-05T16:07:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve error messages for SCC pragmas
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2b535d9ef8864b2d314c739a0e788a6df911aaf">a2b535d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Try to silence underfull \hbox warnings
We use two tricks, as suggested here [1]:
* Use microtype to try to reduce the incidence of underfull boxes
* Bump up \hbadness to eliminate the warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e47217f85b2006f03e72d0a550fe2cca26cfd93">4e47217f</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2019-12-05T16:07:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sameNat and sameSymbol proxy-polymorphic
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8324f0b7357c428f505dccbc84bb7dde897b509c">8324f0b7</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2019-12-05T16:07:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Test proxy-polymorphic sameNat and sameSymbol
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69001f54279a55bc4e5e5883c675e5ba6fe49a22">69001f54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Clear segment bitmaps during sweep
Previously we would clear the bitmaps of segments which we are going to
sweep during the preparatory pause. However, this is unnecessary: the
existence of the mark epoch ensures that the sweep will correctly
identify non-reachable objects, even if we do not clear the bitmap.
We now defer clearing the bitmap to sweep, which happens concurrently
with mutation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58a9c4295b9f457ca465415b7017f8e343d54339">58a9c429</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Disable divByZero on non-NCG targets
The LLVM backend does not guarantee any particular semantics for
division by zero, making this test unreliable across platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8280bd8ab7a20a0a78ca53a06279cf8f07864eb5">8280bd8a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Factor out terminal coloring
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92a52aaaf48420335c4beda45cf40388d305c3f2">92a52aaa</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Make performance metric summary more readable
Along with some refactoring.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4ca29c796fa86ad9d5cd4dfa1a5cdd4e0565fb0">c4ca29c7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Use colors more consistently
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3354c68ec6c90bbccc0f361aa7973eeb75ea229c">3354c68e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pretty-printing of the * kind
Before this patch, GHC always printed the * kind unparenthesized.
This led to two issues:
1. Sometimes GHC printed invalid or incorrect code.
For example, GHC would print: type F @* x = x
when it meant to print: type F @(*) x = x
In the former case, instead of a kind application we were getting a
type operator (@*).
2. Sometimes GHC printed kinds that were correct but hard to read.
Should Either * Int be read as Either (*) Int
or as (*) Either Int ?
This depends on whether -XStarIsType is enabled, but it would be
easier if we didn't have to check for the flag when reading the code.
We can solve both problems by assigning (*) a different precedence. Note
that Haskell98 kinds are not affected:
((* -> *) -> *) -> * does NOT become (((*) -> (*)) -> (*)) -> (*)
The parentheses are added when (*) is used in a function argument
position:
F * * * becomes F (*) (*) (*)
F A * B becomes F A (*) B
Proxy * becomes Proxy (*)
a * -> * becomes a (*) -> *
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70dd0e4b7051e674479729916285b12fc14c696f">70dd0e4b</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parenthesize the * kind in TH.Ppr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7a4efbff1badf7daa41256cb506915e4fddee5c">a7a4efbf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-05T16:07:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/NonMovingSweep: Fix locking of new mutable list allocation
Previously we used allocBlockOnNode_sync in nonmovingSweepMutLists
despite the fact that we aren't in the GC and therefore the allocation
spinlock isn't in use. This meant that sweep would end up spinning until
the next minor GC, when the SM lock was moved away from the SM_MUTEX to
the spinlock. This isn't a correctness issue but it sure isn't good for
performance.
Found thanks for Ward.
Fixes #17539.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f171b3582d44746bf8b08897a3b23bc97e5dbdda">f171b358</a></strong>
<div>
<span>by Matthias Braun</span>
<i>at 2019-12-05T16:07:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in documentation of Base.hs.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9897e8c8ef0b19a9571ef97a1d9bb050c1ee9121">9897e8c8</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-06T21:20:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement pointer tagging for big families (#14373)
Formerly we punted on these and evaluated constructors always got a tag
of 1.
We now cascade switches because we have to check the tag first and when
it is MAX_PTR_TAG then get the precise tag from the info table and
switch on that. The only technically tricky part is that the default
case needs (logical) duplication. To do this we emit an extra label for
it and branch to that from the second switch. This avoids duplicated
codegen.
Here's a simple example of the new code gen:
data D = D1 | D2 | D3 | D4 | D5 | D6 | D7 | D8
On a 64-bit system previously all constructors would be tagged 1. With
the new code gen D7 and D8 are tagged 7:
[Lib.D7_con_entry() {
...
{offset
c1eu: // global
R1 = R1 + 7;
call (P64[Sp])(R1) args: 8, res: 0, upd: 8;
}
}]
[Lib.D8_con_entry() {
...
{offset
c1ez: // global
R1 = R1 + 7;
call (P64[Sp])(R1) args: 8, res: 0, upd: 8;
}
}]
When switching we now look at the info table only when the tag is 7. For
example, if we derive Enum for the type above, the Cmm looks like this:
c2Le:
_s2Js::P64 = R1;
_c2Lq::P64 = _s2Js::P64 & 7;
switch [1 .. 7] _c2Lq::P64 {
case 1 : goto c2Lk;
case 2 : goto c2Ll;
case 3 : goto c2Lm;
case 4 : goto c2Ln;
case 5 : goto c2Lo;
case 6 : goto c2Lp;
case 7 : goto c2Lj;
}
// Read info table for tag
c2Lj:
_c2Lv::I64 = %MO_UU_Conv_W32_W64(I32[I64[_s2Js::P64 & (-8)] - 4]);
if (_c2Lv::I64 != 6) goto c2Lu; else goto c2Lt;
Generated Cmm sizes do not change too much, but binaries are very
slightly larger, due to the fact that the new instructions are longer in
encoded form. E.g. previously entry code for D8 above would be
00000000000001c0 <Lib_D8_con_info>:
1c0: 48 ff c3 inc %rbx
1c3: ff 65 00 jmpq *0x0(%rbp)
With this patch
00000000000001d0 <Lib_D8_con_info>:
1d0: 48 83 c3 07 add $0x7,%rbx
1d4: ff 65 00 jmpq *0x0(%rbp)
This is one byte longer.
Secondly, reading info table directly and then switching is shorter
_c1co:
movq -1(%rbx),%rax
movl -4(%rax),%eax
// Switch on info table tag
jmp *_n1d5(,%rax,8)
than doing the same switch, and then for the tag 7 doing another switch:
// When tag is 7
_c1ct:
andq $-8,%rbx
movq (%rbx),%rax
movl -4(%rax),%eax
// Switch on info table tag
...
Some changes of binary sizes in actual programs:
- In NoFib the worst case is 0.1% increase in benchmark "parser" (see
NoFib results below). All programs get slightly larger.
- Stage 2 compiler size does not change.
- In "containers" (the library) size of all object files increases
0.0005%. Size of the test program "bitqueue-properties" increases
0.03%.
nofib benchmarks kindly provided by Ömer (@osa1):
NoFib Results
=============
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS +0.0% 0.0% -0.0% -0.0% -0.0%
CSD +0.0% 0.0% 0.0% +0.0% +0.0%
FS +0.0% 0.0% 0.0% +0.0% 0.0%
S +0.0% 0.0% -0.0% 0.0% 0.0%
VS +0.0% 0.0% -0.0% +0.0% +0.0%
VSD +0.0% 0.0% -0.0% +0.0% -0.0%
VSM +0.0% 0.0% 0.0% 0.0% 0.0%
anna +0.0% 0.0% +0.1% -0.9% -0.0%
ansi +0.0% 0.0% -0.0% +0.0% +0.0%
atom +0.0% 0.0% 0.0% 0.0% 0.0%
awards +0.0% 0.0% -0.0% +0.0% 0.0%
banner +0.0% 0.0% -0.0% +0.0% 0.0%
bernouilli +0.0% 0.0% +0.0% +0.0% +0.0%
binary-trees +0.0% 0.0% -0.0% -0.0% -0.0%
boyer +0.0% 0.0% +0.0% 0.0% -0.0%
boyer2 +0.0% 0.0% +0.0% 0.0% -0.0%
bspt +0.0% 0.0% +0.0% +0.0% 0.0%
cacheprof +0.0% 0.0% +0.1% -0.8% 0.0%
calendar +0.0% 0.0% -0.0% +0.0% -0.0%
cichelli +0.0% 0.0% +0.0% 0.0% 0.0%
circsim +0.0% 0.0% -0.0% -0.1% -0.0%
clausify +0.0% 0.0% +0.0% +0.0% 0.0%
comp_lab_zift +0.0% 0.0% +0.0% 0.0% -0.0%
compress +0.0% 0.0% +0.0% +0.0% 0.0%
compress2 +0.0% 0.0% 0.0% 0.0% 0.0%
constraints +0.0% 0.0% -0.0% -0.0% -0.0%
cryptarithm1 +0.0% 0.0% +0.0% 0.0% 0.0%
cryptarithm2 +0.0% 0.0% +0.0% -0.0% 0.0%
cse +0.0% 0.0% +0.0% +0.0% 0.0%
digits-of-e1 +0.0% 0.0% -0.0% -0.0% -0.0%
digits-of-e2 +0.0% 0.0% +0.0% -0.0% -0.0%
dom-lt +0.0% 0.0% +0.0% +0.0% 0.0%
eliza +0.0% 0.0% -0.0% +0.0% 0.0%
event +0.0% 0.0% -0.0% -0.0% -0.0%
exact-reals +0.0% 0.0% +0.0% +0.0% +0.0%
exp3_8 +0.0% 0.0% -0.0% -0.0% -0.0%
expert +0.0% 0.0% +0.0% +0.0% +0.0%
fannkuch-redux +0.0% 0.0% +0.0% 0.0% 0.0%
fasta +0.0% 0.0% -0.0% -0.0% -0.0%
fem +0.0% 0.0% +0.0% +0.0% +0.0%
fft +0.0% 0.0% +0.0% -0.0% -0.0%
fft2 +0.0% 0.0% +0.0% +0.0% +0.0%
fibheaps +0.0% 0.0% +0.0% +0.0% 0.0%
fish +0.0% 0.0% +0.0% +0.0% 0.0%
fluid +0.0% 0.0% +0.0% +0.0% +0.0%
fulsom +0.0% 0.0% +0.0% -0.0% +0.0%
gamteb +0.0% 0.0% +0.0% -0.0% -0.0%
gcd +0.0% 0.0% +0.0% +0.0% 0.0%
gen_regexps +0.0% 0.0% +0.0% -0.0% -0.0%
genfft +0.0% 0.0% -0.0% -0.0% -0.0%
gg +0.0% 0.0% 0.0% -0.0% 0.0%
grep +0.0% 0.0% +0.0% +0.0% +0.0%
hidden +0.0% 0.0% +0.0% -0.0% -0.0%
hpg +0.0% 0.0% +0.0% -0.1% -0.0%
ida +0.0% 0.0% +0.0% -0.0% -0.0%
infer +0.0% 0.0% -0.0% -0.0% -0.0%
integer +0.0% 0.0% -0.0% -0.0% -0.0%
integrate +0.0% 0.0% 0.0% +0.0% 0.0%
k-nucleotide +0.0% 0.0% -0.0% -0.0% -0.0%
kahan +0.0% 0.0% -0.0% -0.0% -0.0%
knights +0.0% 0.0% +0.0% -0.0% -0.0%
lambda +0.0% 0.0% +1.2% -6.1% -0.0%
last-piece +0.0% 0.0% +0.0% -0.0% -0.0%
lcss +0.0% 0.0% +0.0% -0.0% -0.0%
life +0.0% 0.0% +0.0% -0.0% -0.0%
lift +0.0% 0.0% +0.0% +0.0% 0.0%
linear +0.0% 0.0% +0.0% +0.0% +0.0%
listcompr +0.0% 0.0% -0.0% -0.0% -0.0%
listcopy +0.0% 0.0% -0.0% -0.0% -0.0%
maillist +0.0% 0.0% +0.0% -0.0% -0.0%
mandel +0.0% 0.0% +0.0% +0.0% +0.0%
mandel2 +0.0% 0.0% +0.0% +0.0% -0.0%
mate +0.0% 0.0% +0.0% +0.0% +0.0%
minimax +0.0% 0.0% -0.0% +0.0% -0.0%
mkhprog +0.0% 0.0% +0.0% +0.0% +0.0%
multiplier +0.0% 0.0% 0.0% +0.0% -0.0%
n-body +0.0% 0.0% +0.0% -0.0% -0.0%
nucleic2 +0.0% 0.0% +0.0% +0.0% -0.0%
para +0.0% 0.0% +0.0% +0.0% +0.0%
paraffins +0.0% 0.0% +0.0% +0.0% +0.0%
parser +0.1% 0.0% +0.4% -1.7% -0.0%
parstof +0.0% 0.0% -0.0% -0.0% -0.0%
pic +0.0% 0.0% +0.0% 0.0% -0.0%
pidigits +0.0% 0.0% -0.0% -0.0% -0.0%
power +0.0% 0.0% +0.0% -0.0% -0.0%
pretty +0.0% 0.0% +0.0% +0.0% +0.0%
primes +0.0% 0.0% +0.0% 0.0% 0.0%
primetest +0.0% 0.0% +0.0% +0.0% +0.0%
prolog +0.0% 0.0% +0.0% +0.0% +0.0%
puzzle +0.0% 0.0% +0.0% +0.0% +0.0%
queens +0.0% 0.0% 0.0% +0.0% +0.0%
reptile +0.0% 0.0% +0.0% +0.0% 0.0%
reverse-complem +0.0% 0.0% -0.0% -0.0% -0.0%
rewrite +0.0% 0.0% +0.0% 0.0% -0.0%
rfib +0.0% 0.0% +0.0% +0.0% +0.0%
rsa +0.0% 0.0% +0.0% +0.0% +0.0%
scc +0.0% 0.0% +0.0% +0.0% +0.0%
sched +0.0% 0.0% +0.0% +0.0% +0.0%
scs +0.0% 0.0% +0.0% +0.0% 0.0%
simple +0.0% 0.0% +0.0% +0.0% +0.0%
solid +0.0% 0.0% +0.0% +0.0% 0.0%
sorting +0.0% 0.0% +0.0% -0.0% 0.0%
spectral-norm +0.0% 0.0% -0.0% -0.0% -0.0%
sphere +0.0% 0.0% +0.0% -1.0% 0.0%
symalg +0.0% 0.0% +0.0% +0.0% +0.0%
tak +0.0% 0.0% +0.0% +0.0% +0.0%
transform +0.0% 0.0% +0.4% -1.3% +0.0%
treejoin +0.0% 0.0% +0.0% -0.0% 0.0%
typecheck +0.0% 0.0% -0.0% +0.0% 0.0%
veritas +0.0% 0.0% +0.0% -0.1% +0.0%
wang +0.0% 0.0% +0.0% +0.0% +0.0%
wave4main +0.0% 0.0% +0.0% 0.0% -0.0%
wheel-sieve1 +0.0% 0.0% +0.0% +0.0% +0.0%
wheel-sieve2 +0.0% 0.0% +0.0% +0.0% 0.0%
x2n1 +0.0% 0.0% +0.0% +0.0% 0.0%
--------------------------------------------------------------------------------
Min +0.0% 0.0% -0.0% -6.1% -0.0%
Max +0.1% 0.0% +1.2% +0.0% +0.0%
Geometric Mean +0.0% -0.0% +0.0% -0.1% -0.0%
NoFib GC Results
================
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
circsim +0.0% 0.0% -0.0% -0.0% -0.0%
constraints +0.0% 0.0% -0.0% 0.0% -0.0%
fibheaps +0.0% 0.0% 0.0% -0.0% -0.0%
fulsom +0.0% 0.0% 0.0% -0.6% -0.0%
gc_bench +0.0% 0.0% 0.0% 0.0% -0.0%
hash +0.0% 0.0% -0.0% -0.0% -0.0%
lcss +0.0% 0.0% 0.0% -0.0% 0.0%
mutstore1 +0.0% 0.0% 0.0% -0.0% -0.0%
mutstore2 +0.0% 0.0% +0.0% -0.0% -0.0%
power +0.0% 0.0% -0.0% 0.0% -0.0%
spellcheck +0.0% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min +0.0% 0.0% -0.0% -0.6% -0.0%
Max +0.0% 0.0% +0.0% 0.0% 0.0%
Geometric Mean +0.0% +0.0% +0.0% -0.1% +0.0%
Fixes #14373
These performance regressions appear to be a fluke in CI. See the
discussion in !1742 for details.
Metric Increase:
T6048
T12234
T12425
Naperian
T12150
T5837
T13035
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee07421fcf99189de6506cf8d17185ed540ea2b3">ee07421f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-12-06T21:21:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Work in progress on coercionLKind, coercionRKind
This is a preliminary patch for #17515
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a4ca9eb152c6bfbc3aad71c180a38bbfeca5bfb">0a4ca9eb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-12-06T21:21:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split up coercionKind
This patch implements the idea in #17515, splitting `coercionKind` into:
* `coercion{Left,Right}Kind`, which computes the left/right side of the
pair
* `coercionKind`, which computes the pair of coercible types
This is reduces allocation since we frequently only need only one side
of the pair. Specifically, we see the following improvements on x86-64
Debian 9:
| test | new | old | relative chg. |
| :------- | ---------: | ------------: | ------------: |
| T5030 | 695537752 | 747641152.0 | -6.97% |
| T5321Fun | 449315744 | 474009040.0 | -5.21% |
| T9872a | 2611071400 | 2645040952.0 | -1.28% |
| T9872c | 2957097904 | 2994260264.0 | -1.24% |
| T12227 | 773435072 | 812367768.0 | -4.79% |
| T12545 | 3142687224 | 3215714752.0 | -2.27% |
| T14683 | 9392407664 | 9824775000.0 | -4.40% |
Metric Decrease:
T12545
T9872a
T14683
T5030
T12227
T9872c
T5321Fun
T9872b
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d46a72e19e1b508358827e7270139f3273915697">d46a72e1</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-09T12:05:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix comment typos
The below is only necessary to fix the CI perf fluke that
happened in 9897e8c8ef0b19a9571ef97a1d9bb050c1ee9121:
-------------------------
Metric Decrease:
T5837
T6048
T9020
T12425
T12234
T13035
T12150
Naperian
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3bba7e4b221139090edf54a18c7e0e1ec3f9be8">e3bba7e4</a></strong>
<div>
<span>by Micha Wiedenmann</span>
<i>at 2019-12-10T19:52:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Motivation of DefaultSignatures
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/843ceb3892432b28628e4b4bad2c712ca371d02b">843ceb38</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:53:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add a long form flag to enable the non-moving GC
The old flag, `-xn`, was quite cryptic. Here we add `--nonmoving-gc` in
addition.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/921d32381a0bdd693935aa2bada3cd76870bf2f9">921d3238</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-12-10T19:54:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ignore unary constraint tuples during typechecking (#17511)
We deliberately avoid defining a magical `Unit%` class, for reasons
that I have expounded upon in the newly added
`Note [Ignore unary constraint tuples]` in `TcHsType`. However, a
sneaky user could try to insert `Unit%` into their program by way of
Template Haskell, leading to the interface-file error observed
in #17511. To avoid this, any time we encounter a unary constraint
tuple during typechecking, we drop the surrounding constraint tuple
application. This is safe to do since `Unit% a` and `a` would be
semantically equivalent (unlike other forms of unary tuples).
Fixes #17511.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/436ec9f3b31f9bc7ccf8c685afcda9fc424e45e9">436ec9f3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:55:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Move changelog linting logic to shell script
Allowing it to be easily used locally.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f6b434fc96b1f48315e103f4a77fecc2da89471">2f6b434f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:55:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Move changelog linting logic to shell script
Allowing it to be easily used locally.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a5a6e0718144786c4e0eb7395ede271e57ff4b7">7a5a6e07</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:56:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Fix incorrect @since in GHC.Natural
Fixes #17547.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bbfaf8abac0854a5b7f5485aa830fec669fa602">2bbfaf8a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:57:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: AArch64 supports the GHCi interpreter and SMP
I'm not sure how this was omitted from the list of supported
architectures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f1ceb67331cfbe075c484c8d1d6b6c9f6fc1e92">8f1ceb67</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-12-10T19:57:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Int# section of primops.txt.pp
This matches the organization of the fixed-sized ones, and keeps each
Int* next to its corresponding Word*.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a823b0ffcbd5b5c4c03334e72c8a36460b62ff7">7a823b0f</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-12-10T19:57:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Int64# and Word64# sections of primops.txt.pp
This way it is next to the other fixed-sized ones.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dd9929ad29fd200405d068463af64dafff6b402">8dd9929a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:58:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add (broken) test for #17510
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e47a76a3d0a7b3d424442914478de579a49363c">6e47a76a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-10T19:58:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-layout validate script
This script was previously a whitespace nightmare.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f80c4a66ae219afa7bd4172441f4e94ba649c9d9">f80c4a66</a></strong>
<div>
<span>by Crazycolorz5</span>
<i>at 2019-12-11T14:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Specialize hashing at call site rather than in struct.
Separate word and string hash tables on the type level, and do not store
the hashing function. Thus when a different hash function is desire it
is provided upon accessing the table. This is worst case the same as
before the change, and in the majority of cases is better. Also mark the
functions for aggressive inlining to improve performance. {F1686506}
Reviewers: bgamari, erikd, simonmar
Subscribers: rwbarton, thomie, carter
GHC Trac Issues: #13165
Differential Revision: https://phabricator.haskell.org/D4889
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d1b9619e56e1a83fba9a630e7735adb8ac7c16a">2d1b9619</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-12-11T14:12:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Warn on inferred polymorphic recursion
Silly users sometimes try to use visible dependent quantification
and polymorphic recursion without a CUSK or SAK. This causes
unexpected errors. So we now adjust expectations with a bit
of helpful messaging.
Closes #17541 and closes #17131.
test cases: dependent/should_fail/T{17541{,b},17131}
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4dde485eddacc7a38c47ff1054234e2896c214d8">4dde485e</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2019-12-12T02:24:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add --show-unit-ids flag to ghc-pkg
I only added it into --simple-output and ghc-pkg check output;
there are probably other places where it can be adopted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6e1ec08e79950c8cadd1f7a2e01292d6142fbfc">e6e1ec08</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-12T02:25:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Simplify and clarify performance test baseline search
The previous implementation was extremely complicated, seemingly to
allow the local and CI namespaces to be searched incrementally. However,
it's quite unclear why this is needed and moreover the implementation
seems to have had quadratic runtime cost in the search depth(!).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29c4609c58005aa4dad887b7396f0e95dfe0c68d">29c4609c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-12T02:26:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17549
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f0ee2534fcfd95b0870d09718ac3c31704f5753">9f0ee253</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-12T02:26:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Move -dwarf and -debug jobs to full-build stage
This sacrifices some precision in favor of improving parallelism.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7179b968c709eb0f5413c8e3847a8a593c596185">7179b968</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-12T02:27:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "rts: Drop redundant flags for libffi"
This seems to have regressed builds using `--with-system-libffi`
(#17520).
This reverts commit 3ce18700f80a12c48a029b49c6201ad2410071bb.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc7d56506cb0ab49c385498a2139954397e3c782">cc7d5650</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2019-12-16T10:20:56+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Having no shake upper bound is irresposible
Given that shake is far from "done" API wise,
and is central component to the build system.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9431f905a1eabcb823b65460560558c08fb55cd9">9431f905</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2019-12-16T10:55:50+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add index-state to hadrian/cabal.project
Then one is freer to omit upper bounds, as we won't pick
any new entries on Hackage while building hadrian itself.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e17a866fecebc5f80b4e7da93a73803b86499ca">3e17a866</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-12-16T19:31:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dataConSig
As suggested in #17291
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75355fdef61da44a395ee9bfa2b9dca0eecea58a">75355fde</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-12-16T19:31:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use "OrCoVar" functions less
As described in #17291, we'd like to separate coercions and expressions
in a more robust fashion.
This is a small step in this direction.
- `mkLocalId` now panicks on a covar.
Calls where this was not the case were changed to `mkLocalIdOrCoVar`.
- Don't use "OrCoVar" functions in places where we know the type is
not a coercion.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9686e132a7fe5bbe517a4748fef6094fe74d43d">f9686e13</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-12-16T19:32:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do more validity checks for quantified constraints
Close #17583.
Test case: typecheck/should_fail/T17563
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af7637651bbc55db81e8cef387faf93951d831c2">af763765</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix Windows artifact collection
Variable interpolation in gitlab-ci.yml apparently doesn't work. Sigh.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6d4b902fe2072c4cf75cfc2ec3d9f595938b3a1">e6d4b902</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use xz --threads on Debian 10
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ba650e9f50724d5bbec6cdd7e1d462cf8b7895a">8ba650e9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow debian 8 build to fail
The python release shipped with deb8 (3.3) is too old for our testsuite
driver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac25a3f637d894e9b972600e8942a91570e2dcd0">ac25a3f6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use xz --threads on Alpine
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc6280885f15c00703c4fc8305f6d47747910fc2">cc628088</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Another approach for xz detection
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37d788ab42703682ed22642d1a9f97351a12c7cd">37d788ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Re-add release-x86_64-deb9 job
Also eliminate some redundancy.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f82791382806dcaa0ea2241d97b17e1d3369c0b6">f8279138</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-16T19:33:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Drop redundant release-x86_64-linux-deb9 job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8148ff06d13edc99e6b00c45554f61279cfdee2d">8148ff06</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark cgrun057 as broken on ARMv7
Due to #17554. It's very surprising that this only occurs on ARMv7 but
this is the only place I've seen this failure thusfar.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85e5696d1e244a88053675280c9c28669246983f">85e5696d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark prog001 as fragile on ARMv7
Due to #17555.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5f0aab05866ff178952cf023e7b0e18b5db9562">a5f0aab0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T10272 as broken on ARMv7
Due to #17556.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1e6827c6e4e083eafccabb7a90a38d9d1262bbed">1e6827c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T13825-debugger as broken on ARMv7
Due to #17557.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cef0b7d707c0b242ee788919f76a73d1a3d2c96">7cef0b7d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T14028 as broken on ARMv7
Due to #17558.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ea4eb4babf090e447277a3e4b0dea31d79e9acf">6ea4eb4b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Make ghc_built_by_llvm check more precise
Previously it would hackily look at the flavour name to determine
whether LLVM was used to build stage2 ghc. However, this didn't work at
all with Hadrian and would miss cases like ARM where we use the LLVM
backend by default.
See #16087 for the motivation for why ghc_built_by_llvm is needed at
all. This should catch one of the ARMv7 failures described in #17555.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3e82bf7d74b96f2efc10a2a83c52395aaee400d">c3e82bf7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T5435_* tests as broken on ARM
`T5435_v_asm_a`, `T5435_v_asm_b`, and `T5435_v_gcc` all fail on ARMv7.
See #17559.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb2aa851bc22f5445963b909b2105009a7abb949">eb2aa851</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Don't allow armv7 jobs to fail
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/efc92216f0f961dd86f1fcbc20fd79b4af41e95b">efc92216</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "testsuite: Mark cgrun057 as broken on ARMv7"
This reverts commit 6cfc47ec8a478e1751cb3e7338954da1853c3996.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d2bb9eb828f8daac552a9494746b6d6af60b515">1d2bb9eb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-17T07:24:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark print002 as fragile on ARM
Due to #17557.
Also accepting spurious performance change.
Metric Decrease:
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41f4e4fbe637d22bfded6f1597af57337ae5cf15">41f4e4fb</a></strong>
<div>
<span>by Josh Meredith</span>
<i>at 2019-12-17T07:25:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix ambiguous occurence error when building Hadrian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4374983a60d533768d7cc8a3b29a6e9a2e6babdb">4374983a</a></strong>
<div>
<span>by Josh Meredith</span>
<i>at 2019-12-17T07:25:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename SphinxMode constructors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8f7ecd54821493dc061c55ceebb7e271b17056e">a8f7ecd5</a></strong>
<div>
<span>by Josh Meredith</span>
<i>at 2019-12-17T07:25:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use *Mode suffix instead of *M
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58655b9da7599135395417a042f53cfa13b2151d">58655b9d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-18T13:43:37+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add GHC-API logging hooks
* Add 'dumpAction' hook to DynFlags.
It allows GHC API users to catch dumped intermediate codes and
information. The format of the dump (Core, Stg, raw text, etc.) is now
reported allowing easier automatic handling.
* Add 'traceAction' hook to DynFlags.
Some dumps go through the trace mechanism (for instance unfoldings that
have been considered for inlining). This is problematic because:
1) dumps aren't written into files even with -ddump-to-file on
2) dumps are written on stdout even with GHC API
3) in this specific case, dumping depends on unsafe globally stored
DynFlags which is bad for GHC API users
We introduce 'traceAction' hook which allows GHC API to catch those
traces and to avoid using globally stored DynFlags.
* Avoid dumping empty logs via dumpAction/traceAction (but still write
empty files to keep the existing behavior)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fad866e028e577b55510a3f9a2faf26d6fdd7bce">fad866e0</a></strong>
<div>
<span>by Moritz Kiefer</span>
<i>at 2019-12-19T11:15:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid race condition in hDuplicateTo
In our codebase we have some code along the lines of
```
newStdout <- hDuplicate stdout
stderr `hDuplicateTo` stdout
```
to avoid stray `putStrLn`s from corrupting a protocol (LSP) that is
run over stdout.
On CI we have seen a bunch of issues where `dup2` returned `EBUSY` so
this fails with `ResourceExhausted` in Haskell.
I’ve spent some time looking at the docs for `dup2` and the code in
`base` and afaict the following race condition is being triggered
here:
1. The user calls `hDuplicateTo stderr stdout`.
2. `hDuplicateTo` calls `hClose_help stdout_`, this closes the file
handle for stdout.
3. The file handle for stdout is now free, so another thread
allocating a file might get stdout.
4. If `dup2` is called while `stdout` (now pointing to something
else) is half-open, it returns EBUSY.
I think there might actually be an even worse case where `dup2` is run
after FD 1 is fully open again. In that case, you will end up not just
redirecting the original stdout to stderr but also the whatever
resulted in that file handle being allocated.
As far as I can tell, `dup2` takes care of closing the file handle
itself so there is no reason to do this in `hDuplicateTo`. So this PR
replaces the call to `hClose_help` by the only part of `hClose_help`
that we actually care about, namely, `flushWriteBuffer`.
I tested this on our codebase fairly extensively and haven’t been able
to reproduce the issue with this patch.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c114c6599c1df93b208c5f2b1754523858d80ee">0c114c65</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-19T11:16:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle large ARR_WORDS in heap census (fix #17572)
We can do a heap census with a non-profiling RTS. With a non-profiling
RTS we don't zero superfluous bytes of shrunk arrays hence a need to
handle the case specifically to avoid a crash.
Revert part of a586b33f8e8ad60b5c5ef3501c89e9b71794bbed
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a0d1a6583cc39a31d6947eda1d4998c4fb53c4f">1a0d1a65</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-12-20T10:50:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deduplicate copied monad failure handler code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70e56b272492b65e41a149ec39a939e794fea66b">70e56b27</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-12-20T10:50:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">lookupBindGroupOcc: recommend names in the same namespace (#17593)
Previously, `lookupBindGroupOcc`'s error message would recommend all
similar names in scope, regardless of whether they were type
constructors, data constructors, or functions, leading to the
confusion witnessed in #17593. This is easily fixed by only
recommending names in the same namespace, using the
`nameSpacesRelated` function.
Fixes #17593.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c12355ece0fa14e534c71a9f7327eda9773fad9">3c12355e</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-12-24T01:03:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix endian handling w.r.t. CPP macro WORDS_BIGENDIAN
Include header file `ghcautoconf.h` where the CPP macro
`WORDS_BIGENDIAN` is defined. This finally fixes #17337 (in conjunction
with commit 6c59cc71dc).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11f8eef5a9625c77f78a829406c446b615ed6168">11f8eef5</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2019-12-24T01:03:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fixup! Fix endian handling w.r.t. CPP macro WORDS_BIGENDIAN
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40327b037f7115f7b05cc0265acb787671bea294">40327b03</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-24T01:04:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove outdated comment
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aeea92ef6ffa514793b1d37b38aaed3616c5c24a">aeea92ef</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-25T19:23:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch to ReadTheDocs theme for the user-guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/26493eab8c64776b3133a3c0b3bac33fbd28546c">26493eab</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-25T19:24:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix copy-paste error in comment</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/776df719905b2d39845268a87026bfec90b2795f">776df719</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-25T19:24:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix comment about minimal gcc version
to be consistent what FP_GCC_VERSION requires</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b17114dc360689651f2005126f5dc25510a7263">3b17114d</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-12-26T14:09:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactor in ghc.cabal.in:
- Remove outdated comments
- Move cutils.c from parser to cbits
- Remove unused cutils.h
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/334290b6681796dd141c964b88c541da13ce03c7">334290b6</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-12-26T14:09:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace panic/notHandled with noExtCon in DsMeta
There are many spots in `DsMeta` where `panic` or `notHandled` is
used after pattern-matching on a TTG extension constructor. This is
overkill, however, as using `noExtCon` would work just as well. This
patch switches out these panics for `noExtCon`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68252aa3eb833c9747c59de3a7655a1def1b7a76">68252aa3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-27T15:11:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Skip T17499 when built against integer-simple
Since it routinely times out in CI.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c51aeebc79edd9b317109019522b5ee557c92df">0c51aeeb</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-27T15:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">suppress popup dialog about missing Xcode at configure
tested with `bash` and `zsh`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d76bcc2c0111fdd5ee0ed3e60cdce91ca2172c5">8d76bcc2</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-27T15:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">while at it rename XCode to the official Xcode
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47a68205d5781a65504b255f1e8e08b162f0c6eb">47a68205</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-27T15:12:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark cgrun057 as fragile on ARM
As reported in #17554. Only marking on ARM for now although there is
evidence to suggest that the issue may occur on other platforms as well.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d03dec8ff7681423b9cafa2ce1b5b5f624e664c7">d03dec8f</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2019-12-27T15:13:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">use shell variable CcLlvmBackend for test
Previously we used `AC_DEFINE`d variable `CC_LLVM_BACKEND` which has an empty shell expansion.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2528e6847d6ab11b452998e5511d60b26453f022">2528e684</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:51:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">driver: Include debug level in the recompilation check hash
Fixes #17586.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f14bb50b76a60253a090797c652a9d29120bf875">f14bb50b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:52:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Ensure that nonmoving gc isn't used with profiling
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b426de376e278af5fb7a8ce0ef7b1e245847c662">b426de37</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:52:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Ensure that entry labels don't have predecessors
The LLVM IR forbids the entry label of a procedure from having any
predecessors. In the case of a simple looping function the LLVM code
generator broke this invariant, as noted in #17589. Fix this by
moving the function prologue to its own basic block, as suggested by
@kavon in #11649.
Fixes #11649 and #17589.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/613f7265c7985b779877e6897118c53d5a333f10">613f7265</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:52:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Drop old fix for #11649
This was a hack which is no longer necessary now since we introduce a
dedicated entry block for each procedure.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdeffa5e56abccc64df750ba67a39b4af99adac5">fdeffa5e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:53:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Error on invalid --numa flags
Previously things like `+RTS --numa-debug` would enable NUMA support,
despite being an invalid flag.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ce3ba68ad30d2173983be309ecfc08737e1dc38">9ce3ba68</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:53:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix --debug-numa mode under Docker
As noted in #17606, Docker disallows the get_mempolicy syscall by
default. This caused numerous tests to fail under CI in the `debug_numa`
way. Avoid this by disabling the NUMA probing logic when --debug-numa is
in use, instead setting n_numa_nodes in RtsFlags.c.
Fixes #17606.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5baa2a4326700c3044904ca0535d45d373ef3b89">5baa2a43</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:54:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Disable derefnull when built with LLVM
LLVM does not guarantee any particular semantics when dereferencing null
pointers. Consequently, this test actually passes when built with the
LLVM backend.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd544d3df7ebe6326e38d532ddc4a3756c8fe029">bd544d3d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:54:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Track hash of Cabal Setup builder arguments
Lest we fail to rebuild when they change. Fixes #17611.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e2c495e3c600710bb6fc07dfb3cf0af41b362da">6e2c495e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:55:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TcIface: Fix inverted logic in typechecking of source ticks
Previously we would throw away source ticks when the debug level was
non-zero. This is precisely the opposite of what was intended.
Fixes #17616.
Metric Decrease:
T13056
T9020
T9961
T12425
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7fad387d4c2ab8031eb28cf6b02b4e35f7143374">7fad387d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:55:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">perf_notes: Add --zero-y argument
This makes it easier to see the true magnitude of fluctuations.
Also do some house-keeping in the argument parsing department.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d42b287c3fe2510433a7fb744531a0765ad8ac8">0d42b287</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-12-30T06:55:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Enlarge acceptance window for T1969
As noted in #17624, it's quite unstable, especially, for some reason, on
i386 and armv7 (something about 32-bit platforms perhaps?).
Metric Increase:
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb6082358cdb5f271a8e4c74044a12f97352c52f">eb608235</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2019-12-31T14:22:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy (#13009): Stg
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d710fd666a70ae100120042c8549634537001609">d710fd66</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-12-31T14:23:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: update some Haddock tests
Fixed tests:
* haddockA039: added to all.T
* haddockE004: replaced with T17561 (marked as expect_broken)
New tests:
* haddockA040: deriving clause for a data instance
* haddockA041: haddock and CPP #include
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/859ebdd446eda446d38708a587503c255b58c4c6">859ebdd4</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-12-31T23:44:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add "-Iw" RTS flag for minimum wait between idle GCs (#11134)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd4b65519f99e85a7e8f5c2dcb654a8d463c8858">dd4b6551</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-12-31T23:44:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add additional Note explaining the -Iw flag
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4279ff18070c398b5ddc677f9c5a915de68dafc">c4279ff1</a></strong>
<div>
<span>by Kevin Buhr</span>
<i>at 2019-12-31T23:44:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix some sloppy indentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b84c09d533faf576c406ce9f7163efecf3037787">b84c09d5</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-12-31T23:45:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tweak Cmm dumps to avoid generating sections for empty groups
When dumping Cmm groups check if the group is empty, to avoid generating
empty sections in dump files like
==================== Output Cmm ====================
[]
Also fixes a few bad indentation in the code around changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2e0323f318959c879629ef277f6433b44473c4b">b2e0323f</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2020-01-03T21:22:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify mrStr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c9dc06ba2034e867c9169e60e854539875654fd">3c9dc06b</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2020-01-04T15:55:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos, via a Levenshtein-style corrector
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d561c8f6244f8280a2483e8753c38e39d34c1f01">d561c8f6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-04T15:55:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Cmm related hooks
* stgToCmm hook
* cmmToRawCmm hook
These hooks are used by Asterius and could be useful to other clients of
the GHC API.
It increases the Parser dependencies (test CountParserDeps) to 184. It's
still less than 200 which was the initial request (cf
https://mail.haskell.org/pipermail/ghc-devs/2019-September/018122.html)
so I think it's ok to merge this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae6b62765b12b44163612488a94a9ac270b4dcc5">ae6b6276</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-01-04T15:56:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update to Cabal submodule to v3.2.0.0-alpha3
Metric Increase:
haddock.Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/073f7cfdf374846e287f826cf6a83e7b3fec55a6">073f7cfd</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-01-04T15:56:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add lexerDbg to dump the tokens fed to the parser
This a small utility function that comes in handy when debugging the
lexer and the parser.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558d4d4a2b5927875dceb42e120026e75e313f33">558d4d4a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-04T15:57:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split integerGmpInternals test in several parts
This is to prepare for ghc-bignum which implements some but not all of
gmp functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4056b9666a0fc5865a82fbba03e8312d7900ac5b">4056b966</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-04T15:58:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark cgrun057 as fragile on all platforms
I have seen this fail both on x86-64/Debian 9 and armv7/Debian 9
See #17554.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ffea0c6c6a2670fd6819540f3ea61ce6620caaa">5ffea0c6</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-01-06T18:38:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix overflow.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99a9f51bf8207c79241fc0b685fadeb222a61292">99a9f51b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-06T18:39:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: Iface (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7aa4a0615629f36e520c11c7e40db7b1475b6402">7aa4a061</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:11:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Only check GCC version if CC is GCC
Also refactor FP_GCC_EXTRA_FLAGS in a few ways:
* We no longer support compilers which lack support for -fno-builtin
and -fwrapv so remove the condition on GccVersion
* These flags are only necessary when using the via-C backend
so make them conditional on Unregisterised.
Fixes #15742.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0805ed7ef32891685109b6cf3461f8adb4ca6981">0805ed7e</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-01-07T13:12:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use non-empty lists to remove partiality in matching code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7844f3a84fca2a79910f164f5a9d2d44b589bb44">7844f3a8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T17073 as broken on Windows
Due to #17607.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acf40cae24dab7be7c719dba191daa5cf9f7e676">acf40cae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disallow Windows from failing
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34bc02c7bc8b7e8c267e6da9a8c35a6c25f1b72e">34bc02c7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Find Python3 for testsuite
In addition, we prefer the Mingw64 Python distribution on Windows due
to #17483.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e35fe8d58f18bd179efdc848c617dc9eddf4478b">e35fe8d5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix Windows platform test
Previously we used platform.system() and while this worked fine (e.g.
returned `Windows`, as expected) locally under both msys and MingW64
Python distributions, it inexplicably returned `MINGW64_NT-10.0`
under MingW64 Python on CI. It seems os.name is more reliable so we now
use that instead..
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/48ef62175d4e65d3248f2e743750ec2f4d421f3a">48ef6217</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Rename push-test-metrics.sh to test-metrics.sh
Refactoring to follow.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2234fa9252b5da2e4423d1ec52c9830130ecfe35">2234fa92</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-07T13:13:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Pull test metrics before running testsuite
Otherwise the testsuite driver may not have an up-to-date
baseline.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1ca9adbc88903afe49de0d063ccd35daf43f7d9e">1ca9adbc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-07T13:14:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove `parallel` check from configure.ac
`parallel` is no longer a submodule since 3cb063c805ec841ca33b8371ef8aba9329221b6c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b69a3460d11cba49e861f708100801c8e25efa3e">b69a3460</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-07T13:14:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Monomorphize HsModule to GhcPs (#17642)
Analyzing the call sites for `HsModule` reveals that it is only ever
used with parsed code (i.e., `GhcPs`). This simplifies `HsModule` by
concretizing its `pass` parameter to always be `GhcPs`.
Fixes #17642.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d491a6795d507eabe35d8aec63c534d29f2d305b">d491a679</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-08T06:16:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: Renamer (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d589410f6bf394c8aca53f18848bbe4dfca92f23">d589410f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-08T06:17:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump haskeline submodule to 0.8.0.1
(cherry picked from commit feb3b955402d53c3875dd7a9a39f322827e5bd69)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/923a127205dd60147453f4420614efd1be29f070">923a1272</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-08T06:17:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Print Core type applications with no whitespace after @ (#17643)
This brings the pretty-printer for Core in line with how visible
type applications are normally printed: namely, with no whitespace
after the `@` character (i.e., `f @a` instead of `f @ a`). While I'm
in town, I also give the same treatment to type abstractions (i.e.,
`\(@a)` instead of `\(@ a)`) and coercion applications (i.e.,
`f @~x` instead of `f @~ x`).
Fixes #17643.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49f83a0de12a7c02f4a6e99d26eaa362a373afa5">49f83a0d</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-01-12T21:28:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">improve docs for HeaderInfo.getImports
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9129210f7e9937c1065330295f06524661575839">9129210f</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-01-12T21:28:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Overloaded Quotation Brackets (#246)
This patch implements overloaded quotation brackets which generalise the
desugaring of all quotation forms in terms of a new minimal interface.
The main change is that a quotation, for example, [e| 5 |], will now
have type `Quote m => m Exp` rather than `Q Exp`. The `Quote` typeclass
contains a single method for generating new names which is used when
desugaring binding structures.
The return type of functions from the `Lift` type class, `lift` and `liftTyped` have
been restricted to `forall m . Quote m => m Exp` rather than returning a
result in a Q monad.
More details about the feature can be read in the GHC proposal.
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0246-overloaded-bracket.rst
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/350e2b78788d47255d27489dfc62d664498b5de4">350e2b78</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-01-12T21:29:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't zap to Any; error instead
This changes GHC's treatment of so-called Naughty Quantification
Candidates to issue errors, instead of zapping to Any.
Close #16775.
No new test cases, because existing ones cover this well.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b5ddc7f2c10ee84631dd6cb5f6368afbc389449">0b5ddc7f</a></strong>
<div>
<span>by Brian Wignall</span>
<i>at 2020-01-12T21:30:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix more typos, via an improved Levenshtein-style corrector
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f732dbec2159e314619d372aa9cc34d6ab8fadf5">f732dbec</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-12T21:30:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Retain bindists used by head.hackage for longer
Previously we would keep them for two weeks. However, on the stable
branches two weeks can easily elapse with no pushes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c8636da51449ab13399cb029e3e55d7a246ac5a6">c8636da5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-12T21:31:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix LANG=C for readelf invocation in T14999
The test fails when used with LANG=fr_FR.UTF-8
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/077a88de5c0981badbb61b06f32073d7f3a49b08">077a88de</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-01-12T21:32:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide/debug-info: typo “behivior”</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61916c5d038c3b0e87148d3b46149a32f7379ea9">61916c5d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-01-12T21:32:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add comments about TH levels
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1fd766ca7ac1feea1e9c752f8ce438fab8e01d35">1fd766ca</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-01-12T21:32:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments about constraint floating
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de01427e6b1d45122c84eaf03122fda26c4dc688">de01427e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-01-12T21:32:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactor around quantified constraints
This patch clarifies a dark corner of quantified
constraints.
* See Note [Yukky eq_sel for a HoleDest] in TcSMonad
* Minor refactor, breaking out new function
TcInteract.doTopReactEqPred
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30be3bf13a6e72247ff561df1f291370dad79ef9">30be3bf1</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-01-12T21:32:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments in TcHsType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5977d4dacc43e76438acb316d12575e0ead18e2">c5977d4d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-16T05:58:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Better documentation for mkEtaWW [skip ci]
So that hopefully I understand it faster next time. Also got rid of the
confusing `orig_expr`, which makes the call site in `etaExpand` look out
of sync with the passed `n` (which is not the original `n`).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22c0bdc3f3a4e3b787b64ec0f3adba5c7c5b5d04">22c0bdc3</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-01-16T05:59:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle TagToEnum in the same big case as the other primops
Before, it was a panic because it was handled above. But there must have
been an error in my reasoning (another caller?) because #17442 reported
the panic was hit.
But, rather than figuring out what happened, I can just make it
impossible by construction. By adding just a bit more bureaucracy in the
return types, I can handle TagToEnum in the same case as all the others,
so the big case is is now total, and the panic is removed.
Fixes #17442
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee5d63f40c2f507d09a16377a5b35c4c8669a028">ee5d63f4</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-01-16T05:59:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Get rid of OpDest
`OpDest` was basically a defunctionalization. Just turn the code that
cased on it into those functions, and call them directly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1ff552265bbbcc0dba272d4742e8be79baad2c51">1ff55226</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-01-16T06:00:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove special case case of bool during STG -> C--
Allow removing the no longer needed cgPrimOp, getting rid of a small a
small layer violation too.
Change which made the special case no longer needed was #6135 /
6579a6c73082387f82b994305011f011d9d8382b, which dates back to 2013,
making me feel better.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f416fe6432c0f2f2237f096a9fb0e58e897b4ba5">f416fe64</a></strong>
<div>
<span>by Adam Wespiser</span>
<i>at 2020-01-16T06:00:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">replace dead html link (fixes #17661)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6bf2ce88a13bab21ac6da289f3d32dd8f811048">f6bf2ce8</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-16T06:01:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "`exprOkForSpeculation` for Note [IO hack in the demand analyser]"
This reverts commit ce64b397777408731c6dd3f5c55ea8415f9f565b on the
grounds of the regression it would introduce in a couple of packages.
Fixes #17653.
Also undoes a slight metric increase in #13701 introduced by that commit
that we didn't see prior to !1983.
Metric Decrease:
T13701
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a71323ffebf7663c50025d2731bf9de2d04f82c3">a71323ff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-17T08:43:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Don't FORCE_SYMLINKS on Windows
Not all runners have symlink permissions enabled.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0499e3bcd0ea04b7371cee56a8aea1781e9e371f">0499e3bc</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-20T15:31:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix +RTS -Z flag documentation
Stack squeezing is done on context switch, not on GC or stack overflow.
Fix the documentation.
Fixes #17685
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a661df91da5d867ab3e6a912e03a9e1756e59cb6">a661df91</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-20T15:32:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document Stg.FVs module
Fixes #17662
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db24e4803fe9fb13b85fc83193ff4afc407702f6">db24e480</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:32:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Don't trash STG registers
Fixes #13904.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3d7fdb3437a6161cf7ff1f30cd0a6563bf07db0">f3d7fdb3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:32:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Fix typo in readnone attribute
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/442751c605d8a9792014a9e3e694db5b312e80c3">442751c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:32:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Add lower-expect to the -O0 optimisation set
@kavon says that this will improve block layout for stack checks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e90ecc932c4857c774405dc398c940290f70f371">e90ecc93</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:32:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Fix #14251
Fixes the calling convention for functions passing raw SSE-register
values by adding padding as needed to get the values in the right
registers. This problem cropped up when some args were unused an dropped
from the live list.
This folds together 2e23e1c7de01c92b038e55ce53d11bf9db993dd4 and
73273be476a8cc6c13368660b042b3b0614fd928 previously from @kavon.
Metric Increase:
T12707
ManyConstructors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66e511a416b80585995d2b4a669eb037471cb57d">66e511a4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:33:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Preserve more information in framework failures
Namely print the entire exception in hopes that this will help track
down #17649.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b62b8cea0e19073133bf3b6757500d1723d02159">b62b8cea</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-20T15:34:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove deprecated -smp flag
It was deprecated in 2012 with 46258b40
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c04a86af8bc04ee6f966a17381b88a297a54836">0c04a86a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:34:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Reenable submodule linter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bfabd2282e9ced19a273aa94b5d8dd1a27d6bfa">2bfabd22</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:34:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow submodule cleaning to fail on Windows
Currently CI is inexplicably failing with
```
$ git submodule foreach git clean -xdf
fatal: not a git repository: libffi-tarballs/../.git/modules/libffi-tarballs
```
I have no idea how this working tree got into such a state but we do
need to fail more gracefully when it happens. Consequently, we allow the
cleaning step to fail.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/14bced999dc8c826a9a10dfd922dadf2d681ffe3">14bced99</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-01-20T15:35:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put the docs for :instances in alphabetical position
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e0bb82b5e267596c18e1086afd6007a00d2c072">7e0bb82b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:35:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing Note [Improvement from Ground Wanteds]
Closes #17659.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/17e43a7cd48d862f38d3944d44024646f2e97b87">17e43a7c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-20T15:36:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">unregisterised: Fix declaration for stg_NO_FINALIZER
Previously it had a redundant _entry suffix. We never noticed this
previously presumably because we never generated references to it
(however hard to believe this may be). However, it did start failing in
!1304.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3dae006fc424e768bb43fc73851a08fefcb732a5">3dae006f</a></strong>
<div>
<span>by PHO</span>
<i>at 2020-01-20T15:37:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid ./configure failure on NetBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/738e2912bfa2122074630d38693a260e4b58aeaf">738e2912</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-24T13:42:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Widen acceptance window of T1969
I have seen >20% fluctuations in this number, leading to spurious
failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ad4eb7a76f6f1fb18e3ea47665feb3a9893427de">ad4eb7a7</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2020-01-25T05:19:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document the fact, that openFileBlocking can consume an OS thread indefinitely.
Also state that a deadlock can happen with the non-threaded runtime.
[ci skip]</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be910728d78fdf2ee800828ecdc8a11bd64fdad0">be910728</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-25T05:19:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`-ddump-str-signatures` dumps Text, not STG [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e57d8a106a61cac11bacb43633b8b4af12d7fdb">0e57d8a1</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-25T05:20:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix chaining tagged and untagged ptrs in compacting GC
Currently compacting GC has the invariant that in a chain all fields are tagged
the same. However this does not really hold: root pointers are not tagged, so
when we thread a root we initialize a chain without a tag. When the pointed
objects is evaluated and we have more pointers to it from the heap, we then add
*tagged* fields to the chain (because pointers to it from the heap are tagged),
ending up chaining fields with different tags (pointers from roots are NOT
tagged, pointers from heap are). This breaks the invariant and as a result
compacting GC turns tagged pointers into non-tagged.
This later causes problem in the generated code where we do reads assuming that
the pointer is aligned, e.g.
0x7(%rax) -- assumes that pointer is tagged 1
which causes misaligned reads. This caused #17088.
We fix this using the "pointer tagging for large families" patch (#14373,
!1742):
- With the pointer tagging patch the GC can know what the tagged pointer to a
CONSTR should be (previously we'd need to know the family size -- large
families are always tagged 1, small families are tagged depending on the
constructor).
- Since we now know what the tags should be we no longer need to store the
pointer tag in the info table pointers when forming chains in the compacting
GC.
As a result we no longer need to tag pointers in chains with 1/2 depending on
whether the field points to an info table pointer, or to another field: an info
table pointer is always tagged 0, everything else in the chain is tagged 1. The
lost tags in pointers can be retrieved by looking at the info table.
Finally, instead of using tag 1 for fields and tag 0 for info table pointers, we
use two different tags for fields:
- 1 for fields that have untagged pointers
- 2 for fields that have tagged pointers
When unchaining we then look at the pointer to a field, and depending on its tag
we either leave a tagged pointer or an untagged pointer in the field.
This allows chaining untagged and tagged fields together in compacting GC.
Fixes #17088
Nofib results
-------------
Binaries are smaller because of smaller `Compact.c` code.
make mode=fast EXTRA_RUNTEST_OPTS="-cachegrind" EXTRA_HC_OPTS="-with-rtsopts=-c" NoFibRuns=1
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS -0.3% 0.0% +0.0% +0.0% +0.0%
CSD -0.3% 0.0% +0.0% +0.0% +0.0%
FS -0.3% 0.0% +0.0% -0.0% -0.0%
S -0.3% 0.0% +5.4% +0.8% +3.9%
VS -0.3% 0.0% +0.0% -0.0% -0.0%
VSD -0.3% 0.0% -0.0% -0.0% -0.2%
VSM -0.3% 0.0% +0.0% +0.0% +0.0%
anna -0.1% 0.0% +0.0% +0.0% +0.0%
ansi -0.3% 0.0% +0.1% +0.0% +0.0%
atom -0.2% 0.0% +0.0% +0.0% +0.0%
awards -0.2% 0.0% +0.0% 0.0% -0.0%
banner -0.3% 0.0% +0.0% +0.0% +0.0%
bernouilli -0.3% 0.0% +0.1% +0.0% +0.0%
binary-trees -0.2% 0.0% +0.0% 0.0% +0.0%
boyer -0.3% 0.0% +0.2% +0.0% +0.0%
boyer2 -0.2% 0.0% +0.2% +0.1% +0.0%
bspt -0.2% 0.0% +0.0% +0.0% +0.0%
cacheprof -0.2% 0.0% +0.0% +0.0% +0.0%
calendar -0.3% 0.0% +0.0% +0.0% +0.0%
cichelli -0.3% 0.0% +1.1% +0.2% +0.5%
circsim -0.2% 0.0% +0.0% -0.0% -0.0%
clausify -0.3% 0.0% +0.0% -0.0% -0.0%
comp_lab_zift -0.2% 0.0% +0.0% +0.0% +0.0%
compress -0.3% 0.0% +0.0% +0.0% +0.0%
compress2 -0.3% 0.0% +0.0% -0.0% -0.0%
constraints -0.3% 0.0% +0.2% +0.1% +0.1%
cryptarithm1 -0.3% 0.0% +0.0% -0.0% 0.0%
cryptarithm2 -0.3% 0.0% +0.0% +0.0% +0.0%
cse -0.3% 0.0% +0.0% +0.0% +0.0%
digits-of-e1 -0.3% 0.0% +0.0% +0.0% +0.0%
digits-of-e2 -0.3% 0.0% +0.0% +0.0% -0.0%
dom-lt -0.2% 0.0% +0.0% +0.0% +0.0%
eliza -0.2% 0.0% +0.0% +0.0% +0.0%
event -0.3% 0.0% +0.1% +0.0% -0.0%
exact-reals -0.2% 0.0% +0.0% +0.0% +0.0%
exp3_8 -0.3% 0.0% +0.0% +0.0% +0.0%
expert -0.2% 0.0% +0.0% +0.0% +0.0%
fannkuch-redux -0.3% 0.0% -0.0% -0.0% -0.0%
fasta -0.3% 0.0% +0.0% +0.0% +0.0%
fem -0.2% 0.0% +0.1% +0.0% +0.0%
fft -0.2% 0.0% +0.0% -0.0% -0.0%
fft2 -0.2% 0.0% +0.0% -0.0% +0.0%
fibheaps -0.3% 0.0% +0.0% -0.0% -0.0%
fish -0.3% 0.0% +0.0% +0.0% +0.0%
fluid -0.2% 0.0% +0.4% +0.1% +0.1%
fulsom -0.2% 0.0% +0.0% +0.0% +0.0%
gamteb -0.2% 0.0% +0.1% +0.0% +0.0%
gcd -0.3% 0.0% +0.0% +0.0% +0.0%
gen_regexps -0.3% 0.0% +0.0% -0.0% -0.0%
genfft -0.3% 0.0% +0.0% +0.0% +0.0%
gg -0.2% 0.0% +0.7% +0.3% +0.2%
grep -0.2% 0.0% +0.0% +0.0% +0.0%
hidden -0.2% 0.0% +0.0% +0.0% +0.0%
hpg -0.2% 0.0% +0.1% +0.0% +0.0%
ida -0.3% 0.0% +0.0% +0.0% +0.0%
infer -0.2% 0.0% +0.0% -0.0% -0.0%
integer -0.3% 0.0% +0.0% +0.0% +0.0%
integrate -0.2% 0.0% +0.0% +0.0% +0.0%
k-nucleotide -0.2% 0.0% +0.0% +0.0% -0.0%
kahan -0.3% 0.0% -0.0% -0.0% -0.0%
knights -0.3% 0.0% +0.0% -0.0% -0.0%
lambda -0.3% 0.0% +0.0% -0.0% -0.0%
last-piece -0.3% 0.0% +0.0% +0.0% +0.0%
lcss -0.3% 0.0% +0.0% +0.0% 0.0%
life -0.3% 0.0% +0.0% -0.0% -0.0%
lift -0.2% 0.0% +0.0% +0.0% +0.0%
linear -0.2% 0.0% +0.0% +0.0% +0.0%
listcompr -0.3% 0.0% +0.0% +0.0% +0.0%
listcopy -0.3% 0.0% +0.0% +0.0% +0.0%
maillist -0.3% 0.0% +0.0% -0.0% -0.0%
mandel -0.2% 0.0% +0.0% +0.0% +0.0%
mandel2 -0.3% 0.0% +0.0% +0.0% +0.0%
mate -0.2% 0.0% +0.0% +0.0% +0.0%
minimax -0.3% 0.0% +0.0% +0.0% +0.0%
mkhprog -0.2% 0.0% +0.0% +0.0% +0.0%
multiplier -0.3% 0.0% +0.0% -0.0% -0.0%
n-body -0.2% 0.0% -0.0% -0.0% -0.0%
nucleic2 -0.2% 0.0% +0.0% +0.0% +0.0%
para -0.2% 0.0% +0.0% -0.0% -0.0%
paraffins -0.3% 0.0% +0.0% -0.0% -0.0%
parser -0.2% 0.0% +0.0% +0.0% +0.0%
parstof -0.2% 0.0% +0.8% +0.2% +0.2%
pic -0.2% 0.0% +0.1% -0.1% -0.1%
pidigits -0.3% 0.0% +0.0% +0.0% +0.0%
power -0.2% 0.0% +0.0% -0.0% -0.0%
pretty -0.3% 0.0% -0.0% -0.0% -0.1%
primes -0.3% 0.0% +0.0% +0.0% -0.0%
primetest -0.2% 0.0% +0.0% -0.0% -0.0%
prolog -0.3% 0.0% +0.0% -0.0% -0.0%
puzzle -0.3% 0.0% +0.0% +0.0% +0.0%
queens -0.3% 0.0% +0.0% +0.0% +0.0%
reptile -0.2% 0.0% +0.2% +0.1% +0.0%
reverse-complem -0.3% 0.0% +0.0% +0.0% +0.0%
rewrite -0.3% 0.0% +0.0% -0.0% -0.0%
rfib -0.2% 0.0% +0.0% +0.0% -0.0%
rsa -0.2% 0.0% +0.0% +0.0% +0.0%
scc -0.3% 0.0% -0.0% -0.0% -0.1%
sched -0.3% 0.0% +0.0% +0.0% +0.0%
scs -0.2% 0.0% +0.1% +0.0% +0.0%
simple -0.2% 0.0% +3.4% +1.0% +1.8%
solid -0.2% 0.0% +0.0% +0.0% +0.0%
sorting -0.3% 0.0% +0.0% +0.0% +0.0%
spectral-norm -0.2% 0.0% -0.0% -0.0% -0.0%
sphere -0.2% 0.0% +0.0% +0.0% +0.0%
symalg -0.2% 0.0% +0.0% +0.0% +0.0%
tak -0.3% 0.0% +0.0% +0.0% -0.0%
transform -0.2% 0.0% +0.2% +0.1% +0.1%
treejoin -0.3% 0.0% +0.2% -0.0% -0.1%
typecheck -0.3% 0.0% +0.0% +0.0% +0.0%
veritas -0.1% 0.0% +0.0% +0.0% +0.0%
wang -0.2% 0.0% +0.0% -0.0% -0.0%
wave4main -0.3% 0.0% +0.0% -0.0% -0.0%
wheel-sieve1 -0.3% 0.0% +0.0% -0.0% -0.0%
wheel-sieve2 -0.3% 0.0% +0.0% -0.0% -0.0%
x2n1 -0.3% 0.0% +0.0% +0.0% +0.0%
--------------------------------------------------------------------------------
Min -0.3% 0.0% -0.0% -0.1% -0.2%
Max -0.1% 0.0% +5.4% +1.0% +3.9%
Geometric Mean -0.3% -0.0% +0.1% +0.0% +0.1%
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
circsim -0.2% 0.0% +1.6% +0.4% +0.7%
constraints -0.3% 0.0% +4.3% +1.5% +2.3%
fibheaps -0.3% 0.0% +3.5% +1.2% +1.3%
fulsom -0.2% 0.0% +3.6% +1.2% +1.8%
gc_bench -0.3% 0.0% +4.1% +1.3% +2.3%
hash -0.3% 0.0% +6.6% +2.2% +3.6%
lcss -0.3% 0.0% +0.7% +0.2% +0.7%
mutstore1 -0.3% 0.0% +4.8% +1.4% +2.8%
mutstore2 -0.3% 0.0% +3.4% +1.0% +1.7%
power -0.2% 0.0% +2.7% +0.6% +1.9%
spellcheck -0.3% 0.0% +1.1% +0.4% +0.4%
--------------------------------------------------------------------------------
Min -0.3% 0.0% +0.7% +0.2% +0.4%
Max -0.2% 0.0% +6.6% +2.2% +3.6%
Geometric Mean -0.3% +0.0% +3.3% +1.0% +1.8%
Metric changes
--------------
While it sounds ridiculous, this change causes increased allocations in
the following tests. We concluded that this change can't cause a
difference in allocations and decided to land this patch. Fluctuations
in "bytes allocated" metric is tracked in #17686.
Metric Increase:
Naperian
T10547
T12150
T12234
T12425
T13035
T5837
T6048
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8038cbd96f444fdba18e8c9fb292c565738b774d">8038cbd9</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-25T05:21:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Formulate as translation between Clause Trees
We used to check `GrdVec`s arising from multiple clauses and guards in
isolation. That resulted in a split between `pmCheck` and
`pmCheckGuards`, the implementations of which were similar, but subtly
different in detail. Also the throttling mechanism described in
`Note [Countering exponential blowup]` ultimately got quite complicated
because it had to cater for both checking functions.
This patch realises that pattern match checking doesn't just consider
single guarded RHSs, but that it's always a whole set of clauses, each
of which can have multiple guarded RHSs in turn. We do so by
translating a list of `Match`es to a `GrdTree`:
```haskell
data GrdTree
= Rhs !RhsInfo
| Guard !PmGrd !GrdTree -- captures lef-to-right match semantics
| Sequence !GrdTree !GrdTree -- captures top-to-bottom match semantics
| Empty -- For -XEmptyCase, neutral element of Sequence
```
Then we have a function `checkGrdTree` that matches a given `GrdTree`
against an incoming set of values, represented by `Deltas`:
```haskell
checkGrdTree :: GrdTree -> Deltas -> CheckResult
...
```
Throttling is isolated to the `Sequence` case and becomes as easy as one
would expect: When the union of uncovered values becomes too big, just
return the original incoming `Deltas` instead (which is always a
superset of the union, thus a sound approximation).
The returned `CheckResult` contains two things:
1. The set of values that were not covered by any of the clauses, for
exhaustivity warnings.
2. The `AnnotatedTree` that enriches the syntactic structure of the
input program with divergence and inaccessibility information.
This is `AnnotatedTree`:
```haskell
data AnnotatedTree
= AccessibleRhs !RhsInfo
| InaccessibleRhs !RhsInfo
| MayDiverge !AnnotatedTree
| SequenceAnn !AnnotatedTree !AnnotatedTree
| EmptyAnn
```
Crucially, `MayDiverge` asserts that the tree may force diverging
values, so not all of its wrapped clauses can be redundant.
While the set of uncovered values can be used to generate the missing
equations for warning messages, redundant and proper inaccessible
equations can be extracted from `AnnotatedTree` by
`redundantAndInaccessibleRhss`.
For this to work properly, the interface to the Oracle had to change.
There's only `addPmCts` now, which takes a bag of `PmCt`s. There's a
whole bunch of `PmCt` variants to replace the different oracle functions
from before.
The new `AnnotatedTree` structure allows for more accurate warning
reporting (as evidenced by a number of changes spread throughout GHC's
code base), thus we fix #17465.
Fixes #17646 on the go.
Metric Decrease:
T11822
T9233
PmSeriesS
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86966d48954db4a8bd40046af259ed60aed535eb">86966d48</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-01-25T05:21:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Properly handle constructor-bound type variables
In https://gitlab.haskell.org/ghc/ghc/merge_requests/2192#note_246551
Simon convinced me that ignoring type variables existentially bound by
data constructors have to be the same way as value binders.
Sadly I couldn't think of a regression test, but I'm confident that this
change strictly improves on the status quo.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3fde723633d1788e4ded8c6f59eb7cef1ae95fd">c3fde723</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-25T05:21:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle local fixity declarations in DsMeta properly
`DsMeta.rep_sig` used to skip over `FixSig` entirely, which had the
effect of causing local fixity declarations to be dropped when quoted
in Template Haskell. But there is no good reason for this state of
affairs, as the code in `DsMeta.repFixD` (which handles top-level
fixity declarations) handles local fixity declarations just fine.
This patch factors out the necessary parts of `repFixD` so that they
can be used in `rep_sig` as well.
There was one minor complication: the fixity signatures for class
methods in each `HsGroup` were stored both in `FixSig`s _and_ the
list of `LFixitySig`s for top-level fixity signatures, so I needed
to take action to prevent fixity signatures for class methods being
converted to `Dec`s twice. I tweaked `RnSource.add` to avoid putting
these fixity signatures in two places and added
`Note [Top-level fixity signatures in an HsGroup]` in `GHC.Hs.Decls`
to explain the new design.
Fixes #17608. Bumps the Haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e2d9ee25bce06ae51d2f1cf8df4f7422106a383">6e2d9ee2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-25T05:22:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: Cmm (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b726534fa4764ad423eff9bdfb04305f330a00f">8b726534</a></strong>
<div>
<span>by PHO</span>
<i>at 2020-01-25T05:23:01-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix rts allocateExec() on NetBSD
Similar to SELinux, NetBSD "PaX mprotect" prohibits marking a page
mapping both writable and executable at the same time. Use libffi
which knows how to work around it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6eb566a0cf43aefaf451f5885ca9b56686840a23">6eb566a0</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-01-25T05:23:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add ghc-in-ghci for stack based builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b1a32170a1b8e7a31c2dd28eb1b02f1375ea3998">b1a32170</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-01-25T05:23:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Create ghci.cabal.sh
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a5e4f5f7d6cef16b6b11ac8d3a269b92016ed5d">0a5e4f5f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-25T05:24:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split glasgow_exts into several files (#17316)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3e5c678851ed73897b0eb337e656ff377d242c9">b3e5c678</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-25T05:24:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Throw error on duplicate-named flavours
Throw an error if the user requests a flavour for which there is more
than one match.
Fixes #17156.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0940b59accb6926aaede045bcd5f5bdc77c7075d">0940b59a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-25T08:15:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not bring visible foralls into scope in hsScopedTvs
Previously, `hsScopedTvs` (and its cousin `hsWcScopedTvs`) pretended
that visible dependent quantification could not possibly happen at
the term level, and cemented that assumption with an `ASSERT`:
```hs
hsScopedTvs (HsForAllTy { hst_fvf = vis_flag, ... }) =
ASSERT( vis_flag == ForallInvis )
...
```
It turns out that this assumption is wrong. You can end up tripping
this `ASSERT` if you stick it to the man and write a type for a term
that uses visible dependent quantification anyway, like in this
example:
```hs
{-# LANGUAGE ScopedTypeVariables #-}
x :: forall a -> a -> a
x = x
```
That won't typecheck, but that's not the point. Before the
typechecker has a chance to reject this, the renamer will try
to use `hsScopedTvs` to bring `a` into scope over the body of `x`,
since `a` is quantified by a `forall`. This, in turn, causes the
`ASSERT` to fail. Bummer.
Instead of walking on this dangerous ground, this patch makes GHC
adopt a more hardline stance by pattern-matching directly on
`ForallInvis` in `hsScopedTvs`:
```hs
hsScopedTvs (HsForAllTy { hst_fvf = ForallInvis, ... }) = ...
```
Now `a` will not be brought over the body of `x` at all (which is how
it should be), there's no chance of the `ASSERT` failing anymore (as
it's gone), and best of all, the behavior of `hsScopedTvs` does not
change. Everyone wins!
Fixes #17687.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1132602f764ef4694b52abeaeeaa8da544915134">1132602f</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-01-27T10:03:42-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use splitLHs{ForAll,Sigma}TyInvis throughout the codebase
Richard points out in #17688 that we use `splitLHsForAllTy` and
`splitLHsSigmaTy` in places that we ought to be using the
corresponding `-Invis` variants instead, identifying two bugs
that are caused by this oversight:
* Certain TH-quoted type signatures, such as those that appear in
quoted `SPECIALISE` pragmas, silently turn visible `forall`s into
invisible `forall`s.
* When quoted, the type `forall a -> (a ~ a) => a` will turn into
`forall a -> a` due to a bug in `DsMeta.repForall` that drops
contexts that follow visible `forall`s.
These are both ultimately caused by the fact that `splitLHsForAllTy`
and `splitLHsSigmaTy` split apart visible `forall`s in addition to
invisible ones. This patch cleans things up:
* We now use `splitLHsForAllTyInvis` and `splitLHsSigmaTyInvis`
throughout the codebase. Relatedly, the `splitLHsForAllTy` and
`splitLHsSigmaTy` have been removed, as they are easy to misuse.
* `DsMeta.repForall` now only handles invisible `forall`s to reduce
the chance for confusion with visible `forall`s, which need to be
handled differently. I also renamed it from `repForall` to
`repForallT` to emphasize that its distinguishing characteristic
is the fact that it desugars down to `L.H.TH.Syntax.ForallT`.
Fixes #17688.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97d0b0a367e4c6a52a17c3299439ac7de129da24">97d0b0a3</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-01-27T10:04:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Block.h compile with c++ compilers
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bada77d5882974514d85d4bd0fd4e1801dad755">4bada77d</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2020-01-27T12:30:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable two warnings for files that trigger them
incomplete-uni-patterns and incomplete-record-updates will be in -Wall at a
future date, so prepare for that by disabling those warnings on files that
trigger them.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0188404ab096747f41fdf6c92fd1e312e5575dc6">0188404a</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2020-01-27T12:30:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two warnings to stage 2 build
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acae02c1ae8fe5fdb9966abc019ae98a3b2e51c3">acae02c1</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2020-01-27T12:30:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two warnings to Hadrian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf38a20eefcaaaac404a1818c3eff8273dc67dd9">bf38a20e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-31T02:46:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Call `interpretPackageEnv` from `setSessionDynFlags`
interpretPackageEnv modifies the flags by reading the dreaded package
environments. It is much less surprising to call it from
`setSessionDynFlags` instead of reading package environments as a
side-effect of `initPackages`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29c701c154cafa4844cf3c1bd4a93cacfa6b1ee1">29c701c1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-01-31T02:46:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor package related code
The package terminology is a bit of a mess. Cabal packages contain
components. Instances of these components when built with some
flags/options/dependencies are called units. Units are registered into
package databases and their metadata are called PackageConfig.
GHC only knows about package databases containing units. It is a sad
mismatch not fixed by this patch (we would have to rename parameters
such as `package-id <unit-id>` which would affect users).
This patch however fixes the following internal names:
- Renames PackageConfig into UnitInfo.
- Rename systemPackageConfig into globalPackageDatabase[Path]
- Rename PkgConfXX into PkgDbXX
- Rename pkgIdMap into unitIdMap
- Rename ModuleToPkgDbAll into ModuleNameProvidersMap
- Rename lookupPackage into lookupUnit
- Add comments on DynFlags package related fields
It also introduces a new `PackageDatabase` datatype instead of
explicitly passing the following tuple: `(FilePath,[PackageConfig])`.
The `pkgDatabase` field in `DynFlags` now contains the unit info for
each unit of each package database exactly as they have been read from
disk. Previously the command-line flag `-distrust-all-packages` would
modify these unit info. Now this flag only affects the "dynamic"
consolidated package state found in `pkgState` field. It makes sense
because `initPackages` could be called first with this
`distrust-all-packages` flag set and then again (using ghc-api) without
and it should work (package databases are not read again from disk when
`initPackages` is called the second time).
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/942c714830c73ac40e1c02bff37e2850c6794081">942c7148</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-31T02:46:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rename: Eliminate usage of mkVarOccUnique
Replacing it with `newSysName`. Fixes #17061.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41117d71bb58e001f6a2b6a11c9314d5b70b9182">41117d71</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-31T02:47:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Use one-shot kqueue on macOS
The underlying reason requiring that one-shot usage be disabled (#13903)
has been fixed.
Closes #15768.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01b15b835a7555c501df862b4dc8cc8eaff86afc">01b15b83</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-01-31T02:48:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't crash on encoding failure in print
If the user doesn't use a Unicode locale then the testsuite driver would
previously throw framework failures due to encoding failures. We now
rather use the `replace` error-handling strategy.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c846618ae0f8601515683a4c7677c20c3272a50f">c846618a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-01-31T12:21:10+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do CafInfo/SRT analysis in Cmm
This patch removes all CafInfo predictions and various hacks to preserve
predicted CafInfos from the compiler and assigns final CafInfos to
interface Ids after code generation. SRT analysis is extended to support
static data, and Cmm generator is modified to allow generating
static_link fields after SRT analysis.
This also fixes `-fcatch-bottoms`, which introduces error calls in case
expressions in CorePrep, which runs *after* CoreTidy (which is where we
decide on CafInfos) and turns previously non-CAFFY things into CAFFY.
Fixes #17648
Fixes #9718
Evaluation
==========
NoFib
-----
Boot with: `make boot mode=fast`
Run: `make mode=fast EXTRA_RUNTEST_OPTS="-cachegrind" NoFibRuns=1`
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS -0.0% 0.0% -0.0% -0.0% -0.0%
CSD -0.0% 0.0% -0.0% -0.0% -0.0%
FS -0.0% 0.0% -0.0% -0.0% -0.0%
S -0.0% 0.0% -0.0% -0.0% -0.0%
VS -0.0% 0.0% -0.0% -0.0% -0.0%
VSD -0.0% 0.0% -0.0% -0.0% -0.5%
VSM -0.0% 0.0% -0.0% -0.0% -0.0%
anna -0.1% 0.0% -0.0% -0.0% -0.0%
ansi -0.0% 0.0% -0.0% -0.0% -0.0%
atom -0.0% 0.0% -0.0% -0.0% -0.0%
awards -0.0% 0.0% -0.0% -0.0% -0.0%
banner -0.0% 0.0% -0.0% -0.0% -0.0%
bernouilli -0.0% 0.0% -0.0% -0.0% -0.0%
binary-trees -0.0% 0.0% -0.0% -0.0% -0.0%
boyer -0.0% 0.0% -0.0% -0.0% -0.0%
boyer2 -0.0% 0.0% -0.0% -0.0% -0.0%
bspt -0.0% 0.0% -0.0% -0.0% -0.0%
cacheprof -0.0% 0.0% -0.0% -0.0% -0.0%
calendar -0.0% 0.0% -0.0% -0.0% -0.0%
cichelli -0.0% 0.0% -0.0% -0.0% -0.0%
circsim -0.0% 0.0% -0.0% -0.0% -0.0%
clausify -0.0% 0.0% -0.0% -0.0% -0.0%
comp_lab_zift -0.0% 0.0% -0.0% -0.0% -0.0%
compress -0.0% 0.0% -0.0% -0.0% -0.0%
compress2 -0.0% 0.0% -0.0% -0.0% -0.0%
constraints -0.0% 0.0% -0.0% -0.0% -0.0%
cryptarithm1 -0.0% 0.0% -0.0% -0.0% -0.0%
cryptarithm2 -0.0% 0.0% -0.0% -0.0% -0.0%
cse -0.0% 0.0% -0.0% -0.0% -0.0%
digits-of-e1 -0.0% 0.0% -0.0% -0.0% -0.0%
digits-of-e2 -0.0% 0.0% -0.0% -0.0% -0.0%
dom-lt -0.0% 0.0% -0.0% -0.0% -0.0%
eliza -0.0% 0.0% -0.0% -0.0% -0.0%
event -0.0% 0.0% -0.0% -0.0% -0.0%
exact-reals -0.0% 0.0% -0.0% -0.0% -0.0%
exp3_8 -0.0% 0.0% -0.0% -0.0% -0.0%
expert -0.0% 0.0% -0.0% -0.0% -0.0%
fannkuch-redux -0.0% 0.0% -0.0% -0.0% -0.0%
fasta -0.0% 0.0% -0.0% -0.0% -0.0%
fem -0.0% 0.0% -0.0% -0.0% -0.0%
fft -0.0% 0.0% -0.0% -0.0% -0.0%
fft2 -0.0% 0.0% -0.0% -0.0% -0.0%
fibheaps -0.0% 0.0% -0.0% -0.0% -0.0%
fish -0.0% 0.0% -0.0% -0.0% -0.0%
fluid -0.1% 0.0% -0.0% -0.0% -0.0%
fulsom -0.0% 0.0% -0.0% -0.0% -0.0%
gamteb -0.0% 0.0% -0.0% -0.0% -0.0%
gcd -0.0% 0.0% -0.0% -0.0% -0.0%
gen_regexps -0.0% 0.0% -0.0% -0.0% -0.0%
genfft -0.0% 0.0% -0.0% -0.0% -0.0%
gg -0.0% 0.0% -0.0% -0.0% -0.0%
grep -0.0% 0.0% -0.0% -0.0% -0.0%
hidden -0.0% 0.0% -0.0% -0.0% -0.0%
hpg -0.1% 0.0% -0.0% -0.0% -0.0%
ida -0.0% 0.0% -0.0% -0.0% -0.0%
infer -0.0% 0.0% -0.0% -0.0% -0.0%
integer -0.0% 0.0% -0.0% -0.0% -0.0%
integrate -0.0% 0.0% -0.0% -0.0% -0.0%
k-nucleotide -0.0% 0.0% -0.0% -0.0% -0.0%
kahan -0.0% 0.0% -0.0% -0.0% -0.0%
knights -0.0% 0.0% -0.0% -0.0% -0.0%
lambda -0.0% 0.0% -0.0% -0.0% -0.0%
last-piece -0.0% 0.0% -0.0% -0.0% -0.0%
lcss -0.0% 0.0% -0.0% -0.0% -0.0%
life -0.0% 0.0% -0.0% -0.0% -0.0%
lift -0.0% 0.0% -0.0% -0.0% -0.0%
linear -0.1% 0.0% -0.0% -0.0% -0.0%
listcompr -0.0% 0.0% -0.0% -0.0% -0.0%
listcopy -0.0% 0.0% -0.0% -0.0% -0.0%
maillist -0.0% 0.0% -0.0% -0.0% -0.0%
mandel -0.0% 0.0% -0.0% -0.0% -0.0%
mandel2 -0.0% 0.0% -0.0% -0.0% -0.0%
mate -0.0% 0.0% -0.0% -0.0% -0.0%
minimax -0.0% 0.0% -0.0% -0.0% -0.0%
mkhprog -0.0% 0.0% -0.0% -0.0% -0.0%
multiplier -0.0% 0.0% -0.0% -0.0% -0.0%
n-body -0.0% 0.0% -0.0% -0.0% -0.0%
nucleic2 -0.0% 0.0% -0.0% -0.0% -0.0%
para -0.0% 0.0% -0.0% -0.0% -0.0%
paraffins -0.0% 0.0% -0.0% -0.0% -0.0%
parser -0.1% 0.0% -0.0% -0.0% -0.0%
parstof -0.1% 0.0% -0.0% -0.0% -0.0%
pic -0.0% 0.0% -0.0% -0.0% -0.0%
pidigits -0.0% 0.0% -0.0% -0.0% -0.0%
power -0.0% 0.0% -0.0% -0.0% -0.0%
pretty -0.0% 0.0% -0.3% -0.4% -0.4%
primes -0.0% 0.0% -0.0% -0.0% -0.0%
primetest -0.0% 0.0% -0.0% -0.0% -0.0%
prolog -0.0% 0.0% -0.0% -0.0% -0.0%
puzzle -0.0% 0.0% -0.0% -0.0% -0.0%
queens -0.0% 0.0% -0.0% -0.0% -0.0%
reptile -0.0% 0.0% -0.0% -0.0% -0.0%
reverse-complem -0.0% 0.0% -0.0% -0.0% -0.0%
rewrite -0.0% 0.0% -0.0% -0.0% -0.0%
rfib -0.0% 0.0% -0.0% -0.0% -0.0%
rsa -0.0% 0.0% -0.0% -0.0% -0.0%
scc -0.0% 0.0% -0.3% -0.5% -0.4%
sched -0.0% 0.0% -0.0% -0.0% -0.0%
scs -0.0% 0.0% -0.0% -0.0% -0.0%
simple -0.1% 0.0% -0.0% -0.0% -0.0%
solid -0.0% 0.0% -0.0% -0.0% -0.0%
sorting -0.0% 0.0% -0.0% -0.0% -0.0%
spectral-norm -0.0% 0.0% -0.0% -0.0% -0.0%
sphere -0.0% 0.0% -0.0% -0.0% -0.0%
symalg -0.0% 0.0% -0.0% -0.0% -0.0%
tak -0.0% 0.0% -0.0% -0.0% -0.0%
transform -0.0% 0.0% -0.0% -0.0% -0.0%
treejoin -0.0% 0.0% -0.0% -0.0% -0.0%
typecheck -0.0% 0.0% -0.0% -0.0% -0.0%
veritas -0.0% 0.0% -0.0% -0.0% -0.0%
wang -0.0% 0.0% -0.0% -0.0% -0.0%
wave4main -0.0% 0.0% -0.0% -0.0% -0.0%
wheel-sieve1 -0.0% 0.0% -0.0% -0.0% -0.0%
wheel-sieve2 -0.0% 0.0% -0.0% -0.0% -0.0%
x2n1 -0.0% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min -0.1% 0.0% -0.3% -0.5% -0.5%
Max -0.0% 0.0% -0.0% -0.0% -0.0%
Geometric Mean -0.0% -0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
circsim -0.1% 0.0% -0.0% -0.0% -0.0%
constraints -0.0% 0.0% -0.0% -0.0% -0.0%
fibheaps -0.0% 0.0% -0.0% -0.0% -0.0%
gc_bench -0.0% 0.0% -0.0% -0.0% -0.0%
hash -0.0% 0.0% -0.0% -0.0% -0.0%
lcss -0.0% 0.0% -0.0% -0.0% -0.0%
power -0.0% 0.0% -0.0% -0.0% -0.0%
spellcheck -0.0% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min -0.1% 0.0% -0.0% -0.0% -0.0%
Max -0.0% 0.0% -0.0% -0.0% -0.0%
Geometric Mean -0.0% +0.0% -0.0% -0.0% -0.0%
Manual inspection of programs in testsuite/tests/programs
---------------------------------------------------------
I built these programs with a bunch of dump flags and `-O` and compared
STG, Cmm, and Asm dumps and file sizes.
(Below the numbers in parenthesis show number of modules in the program)
These programs have identical compiler (same .hi and .o sizes, STG, and
Cmm and Asm dumps):
- Queens (1), andre_monad (1), cholewo-eval (2), cvh_unboxing (3),
andy_cherry (7), fun_insts (1), hs-boot (4), fast2haskell (2),
jl_defaults (1), jq_readsPrec (1), jules_xref (1), jtod_circint (4),
jules_xref2 (1), lennart_range (1), lex (1), life_space_leak (1),
bargon-mangler-bug (7), record_upd (1), rittri (1), sanders_array (1),
strict_anns (1), thurston-module-arith (2), okeefe_neural (1),
joao-circular (6), 10queens (1)
Programs with different compiler outputs:
- jl_defaults (1): For some reason GHC HEAD marks a lot of top-level
`[Int]` closures as CAFFY for no reason. With this patch we no longer
make them CAFFY and generate less SRT entries. For some reason Main.o
is slightly larger with this patch (1.3%) and the executable sizes are
the same. (I'd expect both to be smaller)
- launchbury (1): Same as jl_defaults: top-level `[Int]` closures marked
as CAFFY for no reason. Similarly `Main.o` is 1.4% larger but the
executable sizes are the same.
- galois_raytrace (13): Differences are in the Parse module. There are a
lot, but some of the changes are caused by the fact that for some
reason (I think a bug) GHC HEAD marks the dictionary for `Functor
Identity` as CAFFY. Parse.o is 0.4% larger, the executable size is the
same.
- north_array: We now generate less SRT entries because some of array
primops used in this program like `NewArrayOp` get eliminated during
Stg-to-Cmm and turn some CAFFY things into non-CAFFY. Main.o gets 24%
larger (9224 bytes from 9000 bytes), executable sizes are the same.
- seward-space-leak: Difference in this program is better shown by this
smaller example:
module Lib where
data CDS
= Case [CDS] [(Int, CDS)]
| Call CDS CDS
instance Eq CDS where
Case sels1 rets1 == Case sels2 rets2 =
sels1 == sels2 && rets1 == rets2
Call a1 b1 == Call a2 b2 =
a1 == a2 && b1 == b2
_ == _ =
False
In this program GHC HEAD builds a new SRT for the recursive group of
`(==)`, `(/=)` and the dictionary closure. Then `/=` points to `==`
in its SRT field, and `==` uses the SRT object as its SRT. With this
patch we use the closure for `/=` as the SRT and add `==` there. Then
`/=` gets an empty SRT field and `==` points to `/=` in its SRT
field.
This change looks fine to me.
Main.o gets 0.07% larger, executable sizes are identical.
head.hackage
------------
head.hackage's CI script builds 428 packages from Hackage using this
patch with no failures.
Compiler performance
--------------------
The compiler perf tests report that the compiler allocates slightly more
(worst case observed so far is 4%). However most programs in the test
suite are small, single file programs. To benchmark compiler performance
on something more realistic I build Cabal (the library, 236 modules)
with different optimisation levels. For the "max residency" row I run
GHC with `+RTS -s -A100k -i0 -h` for more accurate numbers. Other rows
are generated with just `-s`. (This is because `-i0` causes running GC
much more frequently and as a result "bytes copied" gets inflated by
more than 25x in some cases)
* -O0
| | GHC HEAD | This MR | Diff |
| --------------- | -------------- | -------------- | ------ |
| Bytes allocated | 54,413,350,872 | 54,701,099,464 | +0.52% |
| Bytes copied | 4,926,037,184 | 4,990,638,760 | +1.31% |
| Max residency | 421,225,624 | 424,324,264 | +0.73% |
* -O1
| | GHC HEAD | This MR | Diff |
| --------------- | --------------- | --------------- | ------ |
| Bytes allocated | 245,849,209,992 | 246,562,088,672 | +0.28% |
| Bytes copied | 26,943,452,560 | 27,089,972,296 | +0.54% |
| Max residency | 982,643,440 | 991,663,432 | +0.91% |
* -O2
| | GHC HEAD | This MR | Diff |
| --------------- | --------------- | --------------- | ------ |
| Bytes allocated | 291,044,511,408 | 291,863,910,912 | +0.28% |
| Bytes copied | 37,044,237,616 | 36,121,690,472 | -2.49% |
| Max residency | 1,071,600,328 | 1,086,396,256 | +1.38% |
Extra compiler allocations
--------------------------
Runtime allocations of programs are as reported above (NoFib section).
The compiler now allocates more than before. Main source of allocation
in this patch compared to base commit is the new SRT algorithm
(GHC.Cmm.Info.Build). Below is some of the extra work we do with this
patch, numbers generated by profiled stage 2 compiler when building a
pathological case (the test 'ManyConstructors') with '-O2':
- We now sort the final STG for a module, which means traversing the
entire program, generating free variable set for each top-level
binding, doing SCC analysis, and re-ordering the program. In
ManyConstructors this step allocates 97,889,952 bytes.
- We now do SRT analysis on static data, which in a program like
ManyConstructors causes analysing 10,000 bindings that we would
previously just skip. This step allocates 70,898,352 bytes.
- We now maintain an SRT map for the entire module as we compile Cmm
groups:
data ModuleSRTInfo = ModuleSRTInfo
{ ...
, moduleSRTMap :: SRTMap
}
(SRTMap is just a strict Map from the 'containers' library)
This map gets an entry for most bindings in a module (exceptions are
THUNKs and CAFFY static functions). For ManyConstructors this map
gets 50015 entries.
- Once we're done with code generation we generate a NameSet from SRTMap
for the non-CAFFY names in the current module. This set gets the same
number of entries as the SRTMap.
- Finally we update CafInfos in ModDetails for the non-CAFFY Ids, using
the NameSet generated in the previous step. This usually does the
least amount of allocation among the work listed here.
Only place with this patch where we do less work in the CAF analysis in
the tidying pass (CoreTidy). However that doesn't save us much, as the
pass still needs to traverse the whole program and update IdInfos for
other reasons. Only thing we don't here do is the `hasCafRefs` pass over
the RHS of bindings, which is a stateless pass that returns a boolean
value, so it doesn't allocate much.
(Metric changes blow are all increased allocations)
Metric changes
--------------
Metric Increase:
ManyAlternatives
ManyConstructors
T13035
T14683
T1969
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a87a565365d1724a83cd0d5c5fc3b696210c4f2">2a87a565</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-01-31T12:21:10+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A few optimizations in STG and Cmm parts:
(Guided by the profiler output)
- Add a few bang patterns, INLINABLE annotations, and a seqList in a few
places in Cmm and STG parts.
- Do not add external variables as dependencies in STG dependency
analysis (GHC.Stg.DepAnal).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bef704b6263f49c96af4553407259d36494be3f0">bef704b6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-01T02:28:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve skolemisation
This patch avoids skolemiseUnboundMetaTyVar making
up a fresh Name when it doesn't need to.
See Note [Skolemising and identity]
Improves error messsages for partial type signatures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd11042337a829da1dfbd19ca1a46feabdd23147">cd110423</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-01T02:28:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve pretty-printing for TyConBinders
In particular, show their kinds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/913287a0fa5370a2488ce560f2dfba61db51055d">913287a0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-01T02:28:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix scoping of TyCon binders in TcTyClsDecls
This patch fixes #17566 by refactoring the way we decide the final
identity of the tyvars in the TyCons of a possibly-recursive nest
of type and class decls, possibly with associated types.
It's all laid out in
Note [Swizzling the tyvars before generaliseTcTyCon]
Main changes:
* We have to generalise each decl (with its associated types)
all at once: TcTyClsDecls.generaliseTyClDecl
* The main new work is done in TcTyClsDecls.swizzleTcTyConBndrs
* The mysterious TcHsSyn.zonkRecTyVarBndrs dies altogether
Other smaller things:
* A little refactoring, moving bindTyClTyVars from tcTyClDecl1
to tcDataDefn, tcSynRhs, etc. Clearer, reduces the number of
parameters
* Reduce the amount of swizzling required.
Specifically, bindExplicitTKBndrs_Q_Tv doesn't need
to clone a new Name for the TyVarTv, and not
cloning means that in the vasly common case,
swizzleTyConBndrs is a no-op
In detail:
Rename newTyVarTyVar --> cloneTyVarTyVar
Add newTyVarTyTyVar that doesn't clone
Use the non-cloning newTyVarTyVar in
bindExplicitTKBndrs_Q_Tv
Rename newFlexiKindedTyVarTyVar
--> cloneFlexiKindedTyVarTyVar
* Define new utility function and use it
HsDecls.familyDeclName ::
FamilyDecl (GhcPass p) -> IdP (GhcPass p)
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58ed6c4a0999c0025b1b024bc26171fa6d6773b3">58ed6c4a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-01T02:29:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/M32Alloc: Don't attempt to unmap non-existent pages
The m32 allocator's `pages` list may contain NULLs in the case that the
page was flushed. Some `munmap` implementations (e.g. FreeBSD's) don't
like it if we pass them NULL. Don't do that.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/859db7d639da08622a76a94b85bc9b2b27b8aabc">859db7d6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-01T14:18:49+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve/fix -fcatch-bottoms documentation
Old documentation suggests that -fcatch-bottoms only adds a default
alternative to bottoming case expression, but that's not true. We use a
very simplistic "is exhaustive" check and add default alternatives to
any case expression that does not cover all constructors of the type. In
case of GADTs this simple check assumes all constructors should be
covered, even the ones ruled out by the type of the scrutinee.
Update the documentation to reflect this.
(Originally noticed in #17648)
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54dfa94a36a564e5d092aa566d4670c7e008f152">54dfa94a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-03T21:14:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix docs for FrontendResult
Other variant was removed in ac1a379363618a6f2f17fff65ce9129164b6ef30
but docs were no changed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e63d9c07c0585b85c8fa340d30aeff0130af3f4">5e63d9c0</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-03T21:15:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor HscMain.finish
I found the old control flow a bit hard to follow; I rewrote it to first
decide whether to desugar, and then use that choice when computing
whether to simplify / what sort of interface file to write.
I hope eventually we will always write post-tc interface files, which
will make the logic of this function even simpler, and continue the
thrust of this refactor.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e580e5b8d08b02c39ca49e387882196931163bcf">e580e5b8</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-02-04T09:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not build StgCRunAsm.S for unregisterised builds
For unregisterised builds StgRun/StgReturn are implemented via a mini
interpreter in StgCRun.c and therefore would collide with the
implementations in StgCRunAsm.S.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3b0bd97cb92706b3cee38b2ec13349ca22ecf7d">e3b0bd97</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-02-04T09:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fixup! fixup! Do not build StgCRunAsm.S for unregisterised builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb629fab96fbff43f79190767731501d8642f524">eb629fab</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-04T09:29:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Delete some superfluous helper functions in HscMain
The driver code is some of the nastiest in GHC, and I am worried about
being able to untangle all the tech debt. In `HscMain` we have a number
of helpers which are either not-used or little used. I delete them so we
can reduce cognative load, distilling the essential complexity away from
the cruft.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c90eca550ccf89c8eb880e4428a43a9d0e8203f0">c90eca55</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-05T09:21:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Record type constraints arising from existentials in `PmCoreCt`s
In #17703 (a follow-up of !2192), we established that contrary to my
belief, type constraints arising from existentials in code like
```hs
data Ex where Ex :: a -> Ex
f _ | let x = Ex @Int 15 = case x of Ex -> ...
```
are in fact useful.
This commit makes a number of refactorings and improvements to comments,
but fundamentally changes `addCoreCt.core_expr` to record the type
constraint `a ~ Int` in addition to `x ~ Ex @a y` and `y ~ 15`.
Fixes #17703.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d3b5d5706a8fcfe724ee0a042d5f7c18880ccba">6d3b5d57</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-05T09:22:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testlib: Extend existing *_opts in extra_*_opts
Previously we'd override the existing {run,hc} opts in
extra_{run,hc}_opts, which caused flakiness in T1969, see #17712.
extra_{run,hc}_opts now extends {run,hc} opts, instead of overriding.
Also we shrank the allocation area for T1969 in order to increase
residency sampling frequency.
Fixes #17712
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c89a48dd88b566a23b670ce707208e8c4cf28c1">9c89a48d</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-05T09:22:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove CafInfo-related code from STG lambda lift pass
After c846618ae0 we don't have accurate CafInfos for Ids in the current
module and we're free to introduce new CAFFY or non-CAFFY bindings or
change CafInfos of existing binders; so no we no longer need to
maintain CafInfos in Core or STG passes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70ddb8bf3066a2e70cffb49b100b640830bec7e1">70ddb8bf</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-02-05T09:23:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #17773
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8004e5d1e993363a89b0107380604c5bc02be6b">e8004e5d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-05T13:55:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow Windows builds to fail again
Due to T7702 and the process issues described in #17777.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29b72c00a692b442605b022fcc15c4454ed1c3de">29b72c00</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">VarSet: Introduce nonDetFoldVarSet
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4e6b35daef9336ea6b0922bab595cb02ac742b5">c4e6b35d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move closeOverKinds and friends to TyCoFVs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed2f0e5c38f1dfc9cf049ae63c56117cda99116e">ed2f0e5c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reform the free variable finders for types
This patch delivers on (much of) #17509.
* Introduces the shallow vs deep free variable distinction
* Introduce TyCoRep.foldType,
foldType :: Monoid a => TyCoFolder env a
-> env -> Type -> a
and use it in the free variable finders.
* Substitution in TyCoSubst
* ASSERTs are on for checkValidSubst
* checkValidSubst uses shallowTyCoVarsOfTypes etc
Quite a few things still to do
* We could use foldType in lots of other places
* We could use mapType for substitution. (Check that we get
good code!)
* Some (but not yet all) clients of substitution can now
save time by using shallowTyCoVarsOfTypes
* All calls to tyCoVarsOfTypes should be inspected; most of
them should be shallow. Maybe.
* Currently shallowTyCoVarsOfTypes still returns
unification variables, but not CoVarHoles.
Reason: we need to return unification variables
in some of the calls in TcSimplify, eg when promoting.
* We should do the same thing for tyCoFVsOfTypes, which is
currently unchanged.
* tyCoFVsOfTypes returns CoVarHoles, because of the
use in TcSimplify.mkResidualConstraints. See
Note [Emitting the residual implication in simplifyInfer]
* #17509 talks about "relevant" variables too.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01a1f4fbb1bb62ed621421622f6a15d30c91b3c3">01a1f4fb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for noFreeVarsOfType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e59afd66788fc704999d1987cd351fa165d3c46">0e59afd6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify closeOverKinds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ca5c88e6370c2cafed6b63fe217f70e87d7fcea">9ca5c88e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for coVarsOfType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5541b87c498cdd320e9a18d2134e571d713536e1">5541b87c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for exactTyCoVarsOfType
This entailed
* Adding a tcf_view field to TyCoFolder
* Moving exactTyCoVarsOtType to TcType. It properly belongs
there, since only the typechecker calls this function. But
it also means that we can "see" and inline tcView.
Metric Decrease:
T14683
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c1228511f2dd4d262c04edb8539174a7de810b2">7c122851</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:56:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/588acb99bc3cb377ceb76447dd60656b4a11de5a">588acb99</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-02-08T10:15:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">slightly better named cost-centres for simple pattern bindings #17006
```
main = do
print $ g [1..100] a
where g xs x = map (`mod` x) xs
a :: Int = 324
```
The above program previously attributed the cost of computing 324 to a cost
centre named `(...)`, with this change the cost is attributed to `a` instead.
This change only affects simple pattern bindings (decorated variables: type
signatures, parens, ~ annotations and ! annotations).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/309f8cfdad9cf81f5ee6003821810ea1205ae1d5">309f8cfd</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-08T10:16:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unnecessary parentheses
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7755ffc2920facb7ed74efe379ad825feeaf1024">7755ffc2</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-08T10:16:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce IsPass; refactor wrappers.
There are two main payloads of this patch:
1. This introduces IsPass, which allows e.g. printing
code to ask what pass it is running in (Renamed vs
Typechecked) and thus print extension fields. See
Note [IsPass] in Hs.Extension
2. This moves the HsWrap constructor into an extension
field, where it rightly belongs. This is done for
HsExpr and HsCmd, but not for HsPat, which is left
as an exercise for the reader.
There is also some refactoring around SyntaxExprs, but this
is really just incidental.
This patch subsumes !1721 (sorry @chreekat).
Along the way, there is a bit of refactoring in GHC.Hs.Extension,
including the removal of NameOrRdrName in favor of NoGhcTc.
This meant that we had no real need for GHC.Hs.PlaceHolder, so
I got rid of it.
Updates haddock submodule.
-------------------------
Metric Decrease:
haddock.compiler
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d452be454857549679b93a0682a3f6fedf5d7c1">7d452be4</a></strong>
<div>
<span>by Dylan Yudaken</span>
<i>at 2020-02-08T10:17:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix hs_try_putmvar losing track of running cap
If hs_try_putmvar was called through an unsafe import, it would lose track of the running cap causing a deadlock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2e301aeeae353a64be43e5fa9e7d464797d5648">c2e301ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: Qualify imports of Data.List
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aede171a59f9b7b8022548c385a1cb8c4589f905">aede171a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix -Wcompat-unqualified-imports issues
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4435a8e0b74337fe5faddb9c46691f0f5bf9e653">4435a8e0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce -Wcompat-unqualified-imports
This implements the warning proposed in option (B) of the
Data.List.singleton CLC [discussion][].
This warning, which is included in `-Wcompat` is intended to help users
identify imports of modules that will change incompatibly in future GHC
releases. This currently only includes `Data.List` due to the expected
specialisation and addition of `Data.List.singleton`.
Fixes #17244.
[discussion]: https://groups.google.com/d/msg/haskell-core-libraries/q3zHLmzBa5E/PmlAs_kYAQAJ
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28b5349a1ae88872e343c58c270fe90329f14d87">28b5349a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump stm and process submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d04b9f298c9cc0ff291e0717826743f488670bb">7d04b9f2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:18:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Allow override of Cabal configuration in hadrian.settings
Fixes #17612 by adding a `cabal.configure.opts` key for
`hadrian.settings`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88bf81aaaf67e9c9bb5b12088ab33accd4a55fb3">88bf81aa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-08T10:19:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize unpackCString# to allocate less.
unpackCString# is a recursive function which for each iteration
returns a Cons cell containing the current Char, and a thunk for
unpacking the rest of the string.
In this patch we change from storing addr + offset inside this thunk
to storing only the addr, simply incrementing the address on each
iteration.
This saves one word of allocation per unpacked character.
For a program like "main = print "<largishString>" this amounts
to 2-3% fewer % in bytes allocated.
I also removed the now redundant local unpack definitions.
This removes one call per unpack operation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bec76733b818b0489ffea0834ab6b1560207577c">bec76733</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:19:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GhcThreaded setting
This adopts a patch from NetBSD's packaging fixing the `GhcThreaded`
option of the make build system. In addition we introduce a `ghcThreaded`
option in hadrian's `Flavour` type.
Also fix Hadrian's treatment of the `Use Threaded` entry in `settings`.
Previously it would incorrectly claim `Use Threaded = True` if we were
building the `threaded` runtime way. However, this is inconsistent with
the `make` build system, which defines it to be whether the `ghc`
executable is linked against the threaded runtime.
Fixes #17692.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/545cf1e184a37295245086040750d77a809db16e">545cf1e1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:20:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Depend upon libray dependencies when configuring packages
This will hopefully fix #17631.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/047d3d75b2861e6dd3c0ba21daf50b012e5a7fd3">047d3d75</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:21:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #15316
This is the full testcase for T15316.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/768e58664ffd408e5c4e3bea8f00a650cd0c6501">768e5866</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-08T10:22:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc(Data.List): Add some examples to Data.List
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3900cb83fb10b0209fb5fb1d713bf3aaf3ee42b8">3900cb83</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-08T10:22:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/GHC/List.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd6667665f160f07550b25e9c80fbc197ae2f642">bd666766</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:22:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Clarify that bundled patsyns were introduced in GHC 8.0
Closes #17094.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95741ea1f93c6d9bac055eb620c8bcda0ec5c72d">95741ea1</a></strong>
<div>
<span>by Pepe Iborra</span>
<i>at 2020-02-08T10:23:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update to hie-bios 0.3.2 style program cradle
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb5c19122ea59d1c6758762cb47e1a451bc3b9bf">fb5c1912</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-08T10:24:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove redundant case
This alternative is redundant and triggers no warning when building with 8.6.5
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5d83d9489f383cc940ce123d9385c5cad1af517d">5d83d948</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-08T10:24:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add mkHieFileWithSource which doesn't read the source file from disk
cc/ @pepeiborra
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dfdae56d2ea9b9841e747c36cdff63a826045805">dfdae56d</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-08T10:25:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename ghcAssert to stgAssert in hp2ps/Main.h.
This fixes #17763</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/658f7ac67472a880e19397773edd35a6214ed995">658f7ac6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:26:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">includes: Avoid using single-line comments in HsFFI.h
While single-line comments are supported by C99, dtrace on SmartOS
apparently doesn't support them yet.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c95920a6371768276e439811e99f4822571ff4df">c95920a6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-08T10:26:42-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Import qualified Prelude in parser
This is in preparation of backwards-incompatible changes in happy.
See https://github.com/simonmar/happy/issues/166
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b6dc319a2d83a8a8c426d0ad6f46d0b8fad41253">b6dc319a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-08T10:27:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #12760
The bug seems to be fixed in the meantime, make sure it stays fixed.
Closes #12760
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3857b62cb74ef50cbe88ab898aae946ca933365">b3857b62</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:28:03-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Drop out-of-date comment
The comment in GHC.Base claimed that ($) couldn't be used in that module
as it was wired-in. However, this is no longer true; ($) is merely known
key and is defined in Haskell (with a RuntimeRep-polymorphic type) in
GHC.Base.
The one piece of magic that ($) retains is that it a special typing
rule to allow type inference with higher-rank types
(e.g. `runST $ blah`; see Note [Typing rule for ($)] in TcExpr).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1183ae94a256b30bfe12ddc5e1c29d6f46abd79d">1183ae94</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-02-08T10:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix Arena blocks accounting for MBlock sized allocations
When requesting more than BLOCKS_PER_MBLOCK blocks allocGroup can return a
different number of blocks than requested. Here we use the number of
requested blocks, however arenaFree will subtract the actual number of
blocks we got from arena_blocks (possibly) resulting in a negative value
and triggering ASSERT(arena_blocks >= 0).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97d59db55e3b32861d91783c36d56e5c93f2cd19">97d59db5</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-02-08T10:29:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix need_prealloc being reset when retainer profiling is on
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f630025d457807c4a9da513e4a0823e4643b2a6">1f630025</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-09T02:52:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a test for #15712
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ac784ab381aae936ee3be7c8685e0203ee4dbf6">2ac784ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-09T02:53:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add --test-metrics argument
Allowing the test metric output to be captured to a file, a la
the METRIC_FILE environment variable of the make build system.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f432d8c64058d3d00d917f0bc65feb1bf9f7aecb">f432d8c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-09T02:53:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix --test-summary argument
This appears to be a cut-and-paste error.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a906595f060b9c038332f16adaf664eeb1d50f2e">a906595f</a></strong>
<div>
<span>by Arnaud Spiwack</span>
<i>at 2020-02-09T02:53:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix an outdated note link
This link appears to have been forgotten in
0dad81ca5fd1f63bf8a3b6ad09787559e8bd05c0 .
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ae83da13f03d22a4d810b5d9c0f37f818cb6a00">3ae83da1</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-09T02:54:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Windows fixes (bindists, CI)
This commit implements a few Windows-specific fixes which get us from a CI
job that can't even get as far as starting the testsuite driver, to a state
where we can run the entire testssuite (but have test failures to fix).
- Don't forget about a potential extension for the haddock program, when
preparing the bindist.
- Build the timeout program, used by the testsuite driver on Windows in place
of the Python script used elsewhere, using the boot compiler. We could
alternatively build it with the compiler that we're going to test but this
would be a lot more tedious to write.
- Implement a wrapper-script less installation procedure for Windows, in
`hadrian/bindist/Makefile.
- Make dependencies a bit more accurate in the aforementioned Makefile.
- Update Windows/Hadrian CI job accordingly.
This patch fixes #17486.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82f9be8c6aafb70f612e72bef517c76437726c78">82f9be8c</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-09T02:55:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #14628: Panic (No skolem Info) in GHCi
This patch implements the [sugggestion from Simon (PJ)](https://gitlab.haskell.org/ghc/ghc/issues/14628#note_146559):
- Make `TcErrors.getSkolemInfo` return a `SkolemInfo` rather than an `Implication`.
- If `getSkolemInfo` gets `RuntimeUnk`s, just return a new data constructor in `SkolemInfo`, called `RuntimeUnkSkol`.
- In `TcErrors.pprSkols` print something sensible for a `RuntimeUnkSkol`.
The `getSkolemInfo` function paniced while formating suggestions to add type annotations (subfunction `suggestAddSig`)
to a *"Couldn't match type ‘x’ with ‘y’"* error message.
The `getSkolemInfo` function didn't find any Implication value and paniced.
With this patch the `getSkolemInfo` function does no longer panic, if it finds `RuntimeUnkSkol`s.
As the panic occured while processing an error message, we don't need to implement any new error message!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2e18e26c34424ab814453a73404429cdf1a4d4a">b2e18e26</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-09T02:55:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix -ddump-stg-final.
Once again make sure this dumps the STG used for codegen.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/414e2f626321f8eba8b2d5cc38dcc1a528351d83">414e2f62</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-09T02:56:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Force -fPIC for intree GMP (fix #17799)
Configure intree GMP with `--with-pic` instead of patching it. Moreover
the correct patching was only done for x86_64/darwin (see #17799).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0fd72ee042aa011af7d870febcfead01a424370">f0fd72ee</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-09T17:22:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for improvements to the pattern-match checker [skip ci]
A little late to the game, but better late than never.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/00dc0f7e66a18ab50931325cb6333a2bfd2a6650">00dc0f7e</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-09T17:23:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #13142
Closes #13142
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3e737bbcae7290856450ff9c8b0c7e31fca0c10">f3e737bb</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-10T20:04:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix long distance info for record updates
For record updates where the `record_expr` is a variable, as in #17783:
```hs
data PartialRec = No
| Yes { a :: Int, b :: Bool }
update No = No
update r@(Yes {}) = r { b = False }
```
We should make use of long distance info in
`-Wincomplete-record-updates` checking. But the call to `matchWrapper`
in the `RecUpd` case didn't specify a scrutinee expression, which would
correspond to the `record_expr` `r` here. That is fixed now.
Fixes #17783.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5670881d7779ecd7eee8c969dab66ee343298532">5670881d</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-10T20:05:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fs: Fix UNC remapping code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/375b3c45be0e5de673d03097ebbad442c85c89eb">375b3c45</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-02-11T05:07:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add singleton to Data.OldList
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de32beffde82eec954691703541a2d4081799453">de32beff</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-11T05:08:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not create nested quantified constraints
Previously, we would accidentally make constraints like
forall a. C a => forall b. D b => E a b c as we traversed
superclasses. No longer!
This patch also expands Note [Eagerly expand given superclasses]
to work over quantified constraints; necessary for T16502b.
Close #17202 and #16502.
test cases: typecheck/should_compile/T{17202,16502{,b}}
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e319570ec141e0f63d82d23b88a40f96fc0b7105">e319570e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Use nanosleep instead of usleep
usleep was removed in POSIX.1-2008.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b75e7486de73868e6821a9f680e9e13794dff15c">b75e7486</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:09:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Remove incorrect assertions around MSG_THROWTO messages
Previously we would assert that threads which are sending a
`MSG_THROWTO` message must have their blocking status be blocked on the
message. In the usual case of a thread throwing to another thread this
is guaranteed by `stg_killThreadzh`. However, `throwToSelf`, used by
the GC to kill threads which ran out of heap, failed to guarantee this.
Noted while debugging #17785.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aba51b65863db5f2687f29d10ba24ffa49dabd3b">aba51b65</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-11T05:10:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add arithmetic exception primops (#14664)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b157399f987c31574968719a52a5b00f2acfb36a">b157399f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:10:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Don't assume Gnu linker on Solaris
Compl Yue noticed that the linker was dumping the link map on SmartOS. This is
because Smartos uses the Solaris linker, which uses the `-64` flag, not
`-m64` like Gnu ld, to indicate that it should link for 64-bits. Fix the
configure script to handle the Solaris linker correctly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8d73d779e615ae352934864a347222f175ca277">d8d73d77</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-11T05:11:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Notes only: telescopes
This documentation-only patch fixes #17793
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58a4ddeff7730d160dd66f19c288f8b5b27679e3">58a4ddef</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-11T05:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: build (and ship) iserv on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82023524ff050f26bf00be3432a97f1e537caf41">82023524</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-11T18:04:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TemplateHaskellQuotes: Allow nested splices
There is no issue with nested splices as they do not require any compile
time code execution. All execution is delayed until the top-level
splice.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/50e24eddbac3d3b34003ad985fe6126aa0f83e0f">50e24edd</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-11T18:04:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Hadrian's copy of (Data.Functor.<&>)
The function was added to base with base-4.11 (GHC 8.4)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f82a2f90ceda5c2bc74088fa7f6a7c8cb9c9756f">f82a2f90</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-12T01:56:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document GMP build [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da7f74797e8c322006eba385c9cbdce346dd1d43">da7f7479</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-12T01:57:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: ByteCode and Runtime (cf #13009)
Update haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04f51297e3d7bcf7be0dc7db4673cc3e6f9156ea">04f51297</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-12T01:58:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix naming of tests for #12923
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31fc332191a6298e2643261482e9b43a4b38241b">31fc3321</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-12T01:58:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #12926
Closes #12926
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0c0ee7d9a942a19361e72553cd08f42cc12b04a">f0c0ee7d</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-12T01:58:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix order of arguments in specializer (#17801)
See https://gitlab.haskell.org/ghc/ghc/issues/17801#note_253330
No regression test, as it's hard to trigger.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/059c3c9d7c84fc37c69e9f414ff736d47081e72c">059c3c9d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-12T11:00:58+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Separate CPR analysis from the Demand analyser
The reasons for that can be found in the wiki:
https://gitlab.haskell.org/ghc/ghc/wikis/nested-cpr/split-off-cpr
We now run CPR after demand analysis (except for after the final demand
analysis run just before code gen). CPR got its own dump flags
(`-ddump-cpr-anal`, `-ddump-cpr-signatures`), but not its own flag to
activate/deactivate. It will run with `-fstrictness`/`-fworker-wrapper`.
As explained on the wiki page, this step is necessary for a sane Nested
CPR analysis. And it has quite positive impact on compiler performance:
Metric Decrease:
T9233
T9675
T9961
T15263
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f5ffd8d9ec776db708e690c4fdbf671afa8df48f">f5ffd8d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-12T17:22:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Expose GHC.Unicode.unicodeVersion
This exposes a Data.Version.Version representing the version of the
Unicode database used by `base`. This should clear up some confusion I
have seen in tickets regarding with which Unicode versions a given GHC
can be expected to work.
While in town I also regenerated (but did not update) the Unicode
database with database 12.0.0. Strangely, the file cited in the README
no longer existed. Consequently, I used
https://www.unicode.org/Public/12.0.0/ucd/UnicodeData.txt and was
slightly surprised to find that there were a few changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c2585e0816cb49487fa6a2be5b8e3f191cf3438">6c2585e0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-12T17:22:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Update Unicode database to 12.1.0
Using `curl https://www.unicode.org/Public/12.1.0/ucd/UnicodeData.txt |
libraries/base/cbits/ubconfc 12.1.0`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df08468113ab46832b7ac0a7311b608d1b418c4d">df084681</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-12T23:58:52+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always display inferred variables using braces
We now always show "forall {a}. T" for inferred variables,
previously this was controlled by -fprint-explicit-foralls.
This implements part 1 of https://github.com/ghc-proposals/ghc-proposals/pull/179.
Part of GHC ticket #16320.
Furthermore, when printing a levity restriction error, we now display
the HsWrap of the expression. This lets users see the full elaboration with
-fprint-typechecker-elaboration (see also #17670)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/16d643cfe661716c7a6cb3ce04893a732c5a42af">16d643cf</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove -ddump-srts flag
This flag is deemed not useful.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa28ae95e4c1ff5b70bf3f8dc6e54fb994bbfa51">fa28ae95</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix flag documentation (#17826)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bfd825943f6077836361ddc788fb40f2421e283">1bfd8259</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ensure that Hadrian is built correctly before using it
When Hadrian failed to build, the script would pick a previously built
Hadrian (if available) instead of failing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd6e786a28cc6688b45c8868a3e8a338b081ba01">cd6e786a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-14T05:29:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #17648
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f2c3677b3a08d8ea6c0d1f5fd51e43b7fcfe75b">9f2c3677</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:30:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GMP expects the Target platform as --host parameter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa6086fdf53aef690369771def6cf1c31faa38e8">aa6086fd</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-02-14T05:31:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add explicit LANGUAGE Safe to template-haskell
(cherry picked from commit a5e0f376821ca882880b03b07b451aa574e289ec)</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af6a0c36431639655762440ec8d652796b86fe58">af6a0c36</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T05:31:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add execution and target architecture to stage-compilation figure
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf739945b8b28ff463dc44925348f20b3c1f22cb">cf739945</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:32:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: HsToCore (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/719db3180e3fb0fa95fcfc90feb51ffbb2a2096d">719db318</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-14T05:33:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">De-duplicate overlapping Notes
Documentation only. Fixes #17827
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7550417ac866e562bb015149d8f9a6b8c97b5f84">7550417a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:33:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: drop Sphinx flag checking for PDF documentation (#17825)
It seems that Sphinx produces the ghc-flags.txt in
doc/users_guide/_build rather than pdfRoot. We could copy ghc-flags.txt
into pdfRoot (like happens naturally in the HTML case) but the benefit
is pretty small. Let's just only check the HTML case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/813842f42023457ccb4d93b5906e0f492e4721b2">813842f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">make: Be more selective in building windows-extra-src tarball
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0725f4bbc7f59282ee5fe41619099957030d85ff">0725f4bb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rework handling of win32 toolchain tarballs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/565ce7aee5db966070f9d0267f99a13532d5caf0">565ce7ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Consolidate CI logic
This moves nearly all of the CI logic to .gitlab/ci.sh. This improves
things in a number of ways:
* it's harder for inconsistencies to arise between architectures
* it's easier to share logic between architectures
* on Windows, it's easier to ensure that all CI steps are executed from
within a properly initialized mingw session.
While in town I also add a FreeBSD build job and update the Windows job
to use the gitlab-runner PowerShell executor, since cmd.exe will be
deprecated soon (fixing #17699).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9cbace74dadf6fe64267f0b68635402f5c848b72">9cbace74</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Deduplicate nightly job configuration
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e8371442dc6130a03e648a0e1bc0f1bdfdbfe91">6e837144</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">integer-gmp: Fix unused command-line argument
-L is only needed during linking.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5ee07ab565c1bf7a33d3bd4bcd3fb6c7b100d1c">e5ee07ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't ask sed to operate in-place on symlinks
Some sed implementations (e.g. FreeBSD) refuse to operate in-place on
symlinks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71e5e68fd3794cc63f513d30d467e43761a8ce62">71e5e68f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Disable tests that assume name of libstdc++ on FreeBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b2da0f429f45ad2d945b4b041e1d58477ce7567">7b2da0f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T6132 as broken on FreeBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ef7a15a0c59b4ceff7f6343cabca8497c0eef50">8ef7a15a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/T16930: Don't rely on gnu grep specific --include
In BSD grep this flag only affects directory recursion.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6060003e4f95101adaef0b2c7f26154c59f2e83a">6060003e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass -Wno-unused-command-line-arguments during link on FreeBSD
FreeBSD cc throws a warning if we pass -pthread without actually using
any pthread symbols.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97497baeb70c443030e9e0c59abf4930679b4f82">97497bae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Always clamp reads/writes to 2GB in length
Previously we did this only on Darwin due to #17414. However, even on
other platforms >2GB writes are on shaky ground. POSIX explicitly says
that the result is implementation-specified and Linux will write at most
0x7ffff000, even on 64-bit platforms. Moreover, getting the sign
of the syscall result correct is tricky, as demonstrated by the fact
that T17414 currently fails on FreeBSD.
For simplicity we now just uniformly clamp to 0x7ffff000 on all
platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49be2a3fc5e9f6ca71717cde6889c49dbba816da">49be2a3f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix sphinx version test
The check for the "v" prefix is redundant.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7f7a556f9b89303da4e1c3475e618653d830cc4">f7f7a556</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix unknown link targets
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a204102c634743faac8af345ad8bfec6317e7024">a204102c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs/compare-flags: Don't use python f-strings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92e15a379a675f14667d7b80db608c84e58aa0a8">92e15a37</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix various shellcheck warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/459f7c6e29eed46f8a5be8fac02c45450080a67c">459f7c6e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Drop empty arguments from target list
Fixes #17748.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c06df28dd490d0309e0b1885a6121b45f74edf3c">c06df28d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix "invalid file" failure
I have no idea how this worked previously. Different Python version?
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3fe8444f7e3904be14956f3fe68583da8b730ab4">3fe8444f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T7702 as fragile on Windows
Due to #16799. There was previously an attempt to mark it as broken but
the `opsys` name was incorrect.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe02f78172f06fd3e83ba00246d9ed741474e653">fe02f781</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Assert the opsys names are known
Previously opsys would take any string. This meant it was very easy for
a typo to silently render the predicate ineffective. Fix this by
checking the given operating system name against a list of known values.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/149e2a3a85d92b4afea1643e7e6ed7861d620be2">149e2a3a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compare-flags: Don't rely on encoding flag of subprocess.check_output
Apparently it isn't supported by some slightly older Python versions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/798d59f6a2b517db50ec2536a8331d610a2b379c">798d59f6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add more debug output to failed path in onIOComplete
This will help track down #17035.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e35f3f98b085a6bd925bef1b97f81a3117358e8c">e35f3f98</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow i386 Windows builds to fail again
Due to the resistance of #17736 to resolution.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/261a3cf83b757f6422acafa6e436ea7bb05ff532">261a3cf8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Build integer-simple job in the validate flavour
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b613a961be70e75747816be4d7642b6378a84c3f">b613a961</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Always use mingw64 python on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bc8c8cd02726c5151afdb02a019aec724be8bec">1bc8c8cd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow Windows build to fail due to #17777
The fact that `exec` isn't POSIX compliant means that things can break
in arbitrarily bad ways. Sometimes things happen to work correctly but
sadly this isn't always the case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac63020d3c9960d12efef54003dd088f8ec0413b">ac63020d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Drop unnecessary GHC_VERSION check
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6926f369b8740c1c8095eb0786010d9da9c5fcfd">6926f369</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Folds in the second part of Phyx's Windows process exit fixes [1],
hopefully finally resolving issue #17480.
[1] https://github.com/haskell/process/pull/160
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/584eee71f803ebf59f12758755151110a6e8636f">584eee71</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Use "process job" when spawning processes on Windows
GHC should make calls using process jobs when calling out to GCC and LD.
The reason is these use the exec () family of posix functions. Window's
process model doesn't allow replacement of processes so this is emulated
by creating a new process and immediately exiting the old one. Because
of this when using normal Windows wait functions you would return even
without the child process having finished. In this case if you are
depending on data from the child you will enter a race condition.
The usual fix for this is to use process jobs and wait for the
termination of all children that have ever been spawn by the process you
called. But also waiting for the freeing of all resources.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ecabfa28518947d752403bc1b59ee716652687da">ecabfa28</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "compiler: Disable atomic renaming on Windows"
The original reason this was disabled should be fixed by the previous
commit.
This reverts commit 1c1b63d63efe8b0f789aa7d5b87cfac3edd213eb.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06d60c66d6355e895c7e46275f295b721d63fa92">06d60c66</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cabb384775adacf8326f7dd2cf99291da8dddbb">8cabb384</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compare-flags: Fix output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cf646d36b02b8ea1c289cb52781c9171853b514">8cf646d3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Document -ddump-srts
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/932307a5486e63335f9ee6dc183ff39f6dfc5857">932307a5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix broken reference
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e77818de9cc9b2bc4b19dba4bc479f14078760b7">e77818de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-15T09:26:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accept performance changes
These manifested in the integer-simple job.
Metric Decrease:
T12227
T5549
T14936
T4830
Conversions
T5237
T8766
T4801
T10359
Metric Increase:
T12234
T6048
T3294
T14683
T3064
T9872b
T9872c
T783
T5837
T10678
T14697
T5631
T9203
T13719
T12707
T13056
T9630
T10547
T9872d
T1969
WWRec
T10370
T5321FD
haddock.Cabal
T5642
T9872a
T15263
T12425
MultiLayerModules
T5205
T9233
T13379
haddock.base
T9020
T13035
T12150
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/785008c1235bd77ddb4d13f57f92b249752d8ea5">785008c1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-15T09:30:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Sort test names in expected change output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e851472e59950c9d7ada3224a5bf317c0a9dc1a">9e851472</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-16T10:38:41+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "users-guide: Document -ddump-srts"
This reverts commit 8cf646d36b02b8ea1c289cb52781c9171853b514.
The flag was removed by 16d643cf.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9792c81663d8bef3abfe22cf45405d8d282afe08">9792c816</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-16T09:47:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Probe whether symlinks are usable on Windows
Closes #17706.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee1e5342f612c8b06ac910cd698558ade7a1a887">ee1e5342</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-16T09:47:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the "unused terminals: 2" warning in Parser.y
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4a8ce525fce56eca18358820c0ec35fec8982de">b4a8ce52</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-18T20:14:42-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">If a :reload finds syntax errors in the module graph, remove the loaded modules. (Fixes #17549)
The processing in `compiler/main/GhcMake.hs` computes the ModuleGraph. If it finds errors
in the module header or in the import specifications, then the new module graph is
incomplete and should not be used.
The code before #17549 just reported the errors and left the old ModuleGraph in place.
The new code of this MR replaces the old ModuleGraph with an empty one.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7029cc09edc052c2f97effe33233c53340fcce0">d7029cc0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-18T20:15:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: refactor GMP in-tree build support (#17756)
* Hadrian doesn't use integer-gmp/config.mk file anymore to determine if
building GMP in-tree is required.
"config.mk" is created by Cabal when the integer-gmp package is
configured and this file is still untracked by Hadrian. This led to a
tricky configure "race" because "config.mk" is built by the
"setup-config" rule, but this rule is also used to find dependencies,
in particular the "ghc-gmp.h" header, but the creation of this file
was depending (without being tracked) on "config.mk".
Now Hadrian only builds in-tree GMP if `--with-intree-gmp` is passed
to the top-level configure script.
* in-tree GMP isn't built once for all in a fixed stage (Stage1)
anymore. It is built per stage which is required if we build a
cross-compiler
* switching between in-tree and external GMP is now supported without
having to clean the build directory first.
* "wrappers.c" now includes "ghc-gmp.h" instead of "ghc.h". It
helps ensuring that the build system generates "ghc-gmp.h".
* build in-tree GMP in "<root>/stageN/gmp/gmpbuild" and produce useful
artefacts (libgmp.a, gmp.h, objs/*.o) in "<root>/stageN/gmp"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40d917fb3b99bdb63e7e39d517225d441aaf722d">40d917fb</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-18T20:16:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove the MonadFail P instance
There were two issues with this instance:
* its existence meant that a pattern match failure in the P monad would
produce a user-visible parse error, but the error message would not be
helpful to the user
* due to the MFP migration strategy, we had to use CPP in Lexer.x,
and that created issues for #17750
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a1ce45d6cf03802caf15548210bb9924468c437">5a1ce45d</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-02-18T20:16:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix unboxed tuple size limit (#17837)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/192caf58ca1fc42806166872260d30bdb34dbace">192caf58</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-18T20:17:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix testsuite driver output (#17847)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1500f0898e85316c7c97a2f759d83278a072ab0e">1500f089</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-18T20:18:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Llvm (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d53e81c02c64e72ccb55bf73f0881c5c80fa50ef">d53e81c0</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-02-20T10:36:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for atomic .o writes [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19680ee533bb95c0c5c42aca5c81197e4b233979">19680ee5</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-02-20T10:37:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for --disable-delayed-os-memory-return [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74ad75e87317196c600dfabc61aee1b87d95c214">74ad75e8</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-20T21:17:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-implement unsafe coercions in terms of unsafe equality proofs
(Commit message written by Omer, most of the code is written by Simon
and Richard)
See Note [Implementing unsafeCoerce] for how unsafe equality proofs and
the new unsafeCoerce# are implemented.
New notes added:
- [Checking for levity polymorphism] in CoreLint.hs
- [Implementing unsafeCoerce] in base/Unsafe/Coerce.hs
- [Patching magic definitions] in Desugar.hs
- [Wiring in unsafeCoerce#] in Desugar.hs
Only breaking change in this patch is unsafeCoerce# is not exported from
GHC.Exts, instead of GHC.Prim.
Fixes #17443
Fixes #16893
NoFib
-----
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS -0.1% 0.0% -0.0% -0.0% -0.0%
CSD -0.1% 0.0% -0.0% -0.0% -0.0%
FS -0.1% 0.0% -0.0% -0.0% -0.0%
S -0.1% 0.0% -0.0% -0.0% -0.0%
VS -0.1% 0.0% -0.0% -0.0% -0.0%
VSD -0.1% 0.0% -0.0% -0.0% -0.1%
VSM -0.1% 0.0% -0.0% -0.0% -0.0%
anna -0.0% 0.0% -0.0% -0.0% -0.0%
ansi -0.1% 0.0% -0.0% -0.0% -0.0%
atom -0.1% 0.0% -0.0% -0.0% -0.0%
awards -0.1% 0.0% -0.0% -0.0% -0.0%
banner -0.1% 0.0% -0.0% -0.0% -0.0%
bernouilli -0.1% 0.0% -0.0% -0.0% -0.0%
binary-trees -0.1% 0.0% -0.0% -0.0% -0.0%
boyer -0.1% 0.0% -0.0% -0.0% -0.0%
boyer2 -0.1% 0.0% -0.0% -0.0% -0.0%
bspt -0.1% 0.0% -0.0% -0.0% -0.0%
cacheprof -0.1% 0.0% -0.0% -0.0% -0.0%
calendar -0.1% 0.0% -0.0% -0.0% -0.0%
cichelli -0.1% 0.0% -0.0% -0.0% -0.0%
circsim -0.1% 0.0% -0.0% -0.0% -0.0%
clausify -0.1% 0.0% -0.0% -0.0% -0.0%
comp_lab_zift -0.1% 0.0% -0.0% -0.0% -0.0%
compress -0.1% 0.0% -0.0% -0.0% -0.0%
compress2 -0.1% 0.0% -0.0% -0.0% -0.0%
constraints -0.1% 0.0% -0.0% -0.0% -0.0%
cryptarithm1 -0.1% 0.0% -0.0% -0.0% -0.0%
cryptarithm2 -0.1% 0.0% -0.0% -0.0% -0.0%
cse -0.1% 0.0% -0.0% -0.0% -0.0%
digits-of-e1 -0.1% 0.0% -0.0% -0.0% -0.0%
digits-of-e2 -0.1% 0.0% -0.0% -0.0% -0.0%
dom-lt -0.1% 0.0% -0.0% -0.0% -0.0%
eliza -0.1% 0.0% -0.0% -0.0% -0.0%
event -0.1% 0.0% -0.0% -0.0% -0.0%
exact-reals -0.1% 0.0% -0.0% -0.0% -0.0%
exp3_8 -0.1% 0.0% -0.0% -0.0% -0.0%
expert -0.1% 0.0% -0.0% -0.0% -0.0%
fannkuch-redux -0.1% 0.0% -0.0% -0.0% -0.0%
fasta -0.1% 0.0% -0.5% -0.3% -0.4%
fem -0.1% 0.0% -0.0% -0.0% -0.0%
fft -0.1% 0.0% -0.0% -0.0% -0.0%
fft2 -0.1% 0.0% -0.0% -0.0% -0.0%
fibheaps -0.1% 0.0% -0.0% -0.0% -0.0%
fish -0.1% 0.0% -0.0% -0.0% -0.0%
fluid -0.1% 0.0% -0.0% -0.0% -0.0%
fulsom -0.1% 0.0% +0.0% +0.0% +0.0%
gamteb -0.1% 0.0% -0.0% -0.0% -0.0%
gcd -0.1% 0.0% -0.0% -0.0% -0.0%
gen_regexps -0.1% 0.0% -0.0% -0.0% -0.0%
genfft -0.1% 0.0% -0.0% -0.0% -0.0%
gg -0.1% 0.0% -0.0% -0.0% -0.0%
grep -0.1% 0.0% -0.0% -0.0% -0.0%
hidden -0.1% 0.0% -0.0% -0.0% -0.0%
hpg -0.1% 0.0% -0.0% -0.0% -0.0%
ida -0.1% 0.0% -0.0% -0.0% -0.0%
infer -0.1% 0.0% -0.0% -0.0% -0.0%
integer -0.1% 0.0% -0.0% -0.0% -0.0%
integrate -0.1% 0.0% -0.0% -0.0% -0.0%
k-nucleotide -0.1% 0.0% -0.0% -0.0% -0.0%
kahan -0.1% 0.0% -0.0% -0.0% -0.0%
knights -0.1% 0.0% -0.0% -0.0% -0.0%
lambda -0.1% 0.0% -0.0% -0.0% -0.0%
last-piece -0.1% 0.0% -0.0% -0.0% -0.0%
lcss -0.1% 0.0% -0.0% -0.0% -0.0%
life -0.1% 0.0% -0.0% -0.0% -0.0%
lift -0.1% 0.0% -0.0% -0.0% -0.0%
linear -0.1% 0.0% -0.0% -0.0% -0.0%
listcompr -0.1% 0.0% -0.0% -0.0% -0.0%
listcopy -0.1% 0.0% -0.0% -0.0% -0.0%
maillist -0.1% 0.0% -0.0% -0.0% -0.0%
mandel -0.1% 0.0% -0.0% -0.0% -0.0%
mandel2 -0.1% 0.0% -0.0% -0.0% -0.0%
mate -0.1% 0.0% -0.0% -0.0% -0.0%
minimax -0.1% 0.0% -0.0% -0.0% -0.0%
mkhprog -0.1% 0.0% -0.0% -0.0% -0.0%
multiplier -0.1% 0.0% -0.0% -0.0% -0.0%
n-body -0.1% 0.0% -0.0% -0.0% -0.0%
nucleic2 -0.1% 0.0% -0.0% -0.0% -0.0%
para -0.1% 0.0% -0.0% -0.0% -0.0%
paraffins -0.1% 0.0% -0.0% -0.0% -0.0%
parser -0.1% 0.0% -0.0% -0.0% -0.0%
parstof -0.1% 0.0% -0.0% -0.0% -0.0%
pic -0.1% 0.0% -0.0% -0.0% -0.0%
pidigits -0.1% 0.0% -0.0% -0.0% -0.0%
power -0.1% 0.0% -0.0% -0.0% -0.0%
pretty -0.1% 0.0% -0.1% -0.1% -0.1%
primes -0.1% 0.0% -0.0% -0.0% -0.0%
primetest -0.1% 0.0% -0.0% -0.0% -0.0%
prolog -0.1% 0.0% -0.0% -0.0% -0.0%
puzzle -0.1% 0.0% -0.0% -0.0% -0.0%
queens -0.1% 0.0% -0.0% -0.0% -0.0%
reptile -0.1% 0.0% -0.0% -0.0% -0.0%
reverse-complem -0.1% 0.0% -0.0% -0.0% -0.0%
rewrite -0.1% 0.0% -0.0% -0.0% -0.0%
rfib -0.1% 0.0% -0.0% -0.0% -0.0%
rsa -0.1% 0.0% -0.0% -0.0% -0.0%
scc -0.1% 0.0% -0.1% -0.1% -0.1%
sched -0.1% 0.0% -0.0% -0.0% -0.0%
scs -0.1% 0.0% -0.0% -0.0% -0.0%
simple -0.1% 0.0% -0.0% -0.0% -0.0%
solid -0.1% 0.0% -0.0% -0.0% -0.0%
sorting -0.1% 0.0% -0.0% -0.0% -0.0%
spectral-norm -0.1% 0.0% -0.0% -0.0% -0.0%
sphere -0.1% 0.0% -0.0% -0.0% -0.0%
symalg -0.1% 0.0% -0.0% -0.0% -0.0%
tak -0.1% 0.0% -0.0% -0.0% -0.0%
transform -0.1% 0.0% -0.0% -0.0% -0.0%
treejoin -0.1% 0.0% -0.0% -0.0% -0.0%
typecheck -0.1% 0.0% -0.0% -0.0% -0.0%
veritas -0.0% 0.0% -0.0% -0.0% -0.0%
wang -0.1% 0.0% -0.0% -0.0% -0.0%
wave4main -0.1% 0.0% -0.0% -0.0% -0.0%
wheel-sieve1 -0.1% 0.0% -0.0% -0.0% -0.0%
wheel-sieve2 -0.1% 0.0% -0.0% -0.0% -0.0%
x2n1 -0.1% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min -0.1% 0.0% -0.5% -0.3% -0.4%
Max -0.0% 0.0% +0.0% +0.0% +0.0%
Geometric Mean -0.1% -0.0% -0.0% -0.0% -0.0%
Test changes
------------
- break006 is marked as broken, see #17833
- The compiler allocates less when building T14683 (an unsafeCoerce#-
heavy happy-generated code) on 64-platforms. Allocates more on 32-bit
platforms.
- Rest of the increases are tiny amounts (still enough to pass the
threshold) in micro-benchmarks. I briefly looked at each one in a
profiling build: most of the increased allocations seem to be because
of random changes in the generated code.
Metric Decrease:
T14683
Metric Increase:
T12150
T12234
T12425
T13035
T14683
T5837
T6048
Co-Authored-By: Richard Eisenberg <rae@cs.brynmawr.edu>
Co-Authored-By: Ömer Sinan Ağacan <omeragacan@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6880d6aa1e6e96579bbff89712efd813489cc828">6880d6aa</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:18:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disentangle DynFlags and SDoc
Remove several uses of `sdocWithDynFlags`. The remaining ones are mostly
CodeGen related (e.g. depend on target platform constants) and will be
fixed separately.
Metric Decrease:
T12425
T9961
WWRec
T1969
T14683
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70a901105044c85c756fd93899387f0215f7b1de">70a90110</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-20T21:19:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc(List): Add examples to GHC.List
* Add examples
* Cleanup documentation
* Clarify merge process and Marge bot
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c8439fc789ff00cfdd453d2425d2146df69e0729">c8439fc7</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-02-20T21:20:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix testsuite on powerpc64le
Remove expect broken on recomp tests, #11260 was closed
by !2264 and #11323 most likely by !2264 as well.
GHCi scripts tests work on GHCi but not the external interpreter,
adjust test configuration accordingly. Fixes unexpected passes.
Mark test requiring DWARF expect fail on powerpc64[le] for #11261.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65b7256a88ae2bd878da5d026e4183cba6f6eedf">65b7256a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-20T21:20:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use concatMap(M) instead of `concat . map` and the monadic variant
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b76d4574d703ee66f346775d408220fdddb8155">8b76d457</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-20T21:21:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17832: Weird handling of exports named main in 8.10-rc1
Switching from `lookupGlobalOccRn_maybe` to `lookupInfoOccRn`
to check whether a `main` function is in scope. Unfortunately
`lookupGlobalOccRn_maybe` complains if there are multiple `main`
functions in scope.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/466e1ad5d54cb2e8a3b6f16904b873cad882a736">466e1ad5</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-20T21:22:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use TTG for HsSplicedT constructor
The constructor HsSplicedT occurs only in the GhcTc pass.
This enforces this fact statically via TTG.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e622fcabb30ab7f3836bfc5739747b5608bef43">4e622fca</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-02-20T21:22:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Normalize types when dropping absent arguments from workers
fixes #17852
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a533e54722ec2ec22ef598e07dcfe6c9e84d2602">a533e547</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-02-20T21:23:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mention users guide and release notes in merge request template</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05251b175b3745ed96c9f672115c78c527b63b9e">05251b17</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:24:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix typo in BIN_DIST_PREP_TAR_COMP variable name</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f44c7e6723498c5dde0cd78e4af26142a14d98f4">f44c7e67</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:24:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Avoid duplicating ~/.cabal contents with every build
Previously our attempt to cache the cabal store would
`cp cabal-cache ~/.cabal`. However, if the latter already
existed this meant that we would end up with
~/.cabal/cabal-cache. Not only would this not help caching
but it would exponentially grow the size of ~/.cabal. Not
good!</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5ec996583373025488c090fb2c89f7bda38c1cb">c5ec9965</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Hs.Extension: Use Type instead of *
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89cb4cc4cc76f834b0bcc53fb551db706ef143b7">89cb4cc4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Type instead of * in GHC
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04eb0d6c4de23a4cfe3953e7496f5bc4b5b1d53c">04eb0d6c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable -Wstar-is-type in -Wall
As noted in [proposal 0143][proposal] this is supposed to happen in
8.12.
Also fix an incorrect claim in the users guide that -Wstar-is-type is
enabled by default.
[proposal]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0143-remove-star-kind.rst
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6de966f1369740d00193e64ec82d11e934256616">6de966f1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-20T21:56:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17724 by having occAnal preserve used bindings.
It sometimes happened that occAnal would remove bindings
as dead code by relying on bindings to be in dependency
order. The fix was contributed by SPJ.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abd7f962a9a9207c07cb864921941750818f61a4">abd7f962</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Mention dependency on `exceptions` in release notes
Fixes #17845.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/581753790da8d094ce05b3fc5f5360f5fbf6a7da">58175379</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: minor GMP refactoring
Somehow I forgot to totally remove `gmpContext` in
d7029cc09edc052c2f97effe33233c53340fcce0. This patch fixes it and adds
some additional comments.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33fa8d9433d82b03f3209698bf27420a32302321">33fa8d94</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-02-20T21:56:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Generalize liftData to work over any Quote (#17857)
The Overloaded Quotations proposal generalized the type of `lift`
to work over any `Quote`, but not the type of `liftData`, leading
to #17857. Thankfully, generalizing `liftData` is extremely
straightforward.
Fixes #17857.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cea67955a5ae7d3de7aa9dcfdabaf6ee3681ffc">3cea6795</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make: fix sdist target (#17848)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2cce997320652031e0c6cc62db5e35deff43a79">e2cce997</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix source-dist target (#17849)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a4c89b208c59ddf79c55ee446fcad5a012bb1bc">0a4c89b2</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-21T20:44:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Special case `mkTyConApp liftedTypeKind []`
We really need to make sure that these are shared because otherwise GHC
will allocate thousands of identical `TyConApp` nodes.
See #17292
-------------------------
Metric Decrease:
haddock.Cabal
T14683
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0482f58ab0490b2394ad60946dde3214a0ca1810">0482f58a</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-21T20:45:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TH: wrapGenSyns, don't split the element type too much
The invariant which allowed the pervious method of splitting the type of
the body to find the type of the elements didn't work in the new
overloaded quotation world as the type can be something like
`WriterT () m a` rather than `Q a` like before.
Fixes #17839
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be7068a6130f394dcefbcb5d09c2944deca2270d">be7068a6</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-21T20:45:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parser API annotations: RealSrcLoc
During parsing, GHC collects lexical information about AST nodes and
stores it in a map. It is needed to faithfully restore original source
code, e.g. compare these expressions:
a = b
a = b
The position of the equality sign is not recorded in the AST, so it must
be stored elsewhere.
This system is described in Note [Api annotations].
Before this patch, the mapping was represented by:
Map (SrcSpan, AnnKeywordId) SrcSpan
After this patch, the mapping is represented by:
Map (RealSrcSpan, AnnKeywordId) RealSrcSpan
The motivation behind this change is to avoid using the Ord SrcSpan
instance (required by Map here), as it interferes with #17632 (see the
discussion there).
SrcSpan is isomorphic to Either String RealSrcSpan, but we shouldn't
use those strings as Map keys. Those strings are intended as hints to
the user, e.g. "<interactive>" or "<compiler-generated code>", so they
are not a valid way to identify nodes in the source code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/240f5bf6f53515535be5bf3ef7632aa69ae21e3e">240f5bf6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-21T20:46:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Driver (#13009)
submodule updates: nofib, haddock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9d09411122b9b534b96e988b6d3f6d7eb04b8f66">9d094111</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-21T20:47:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: `docs` rule needs `configure` (#17840)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1674353a1ab40fde183f22bef9eb019d8150dc5a">1674353a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-23T17:31:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fs: Port fixes from ghc-jailbreak repository
* Override rename, unlink, and remove
* Factor out wchar conversion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/853210f20699b54dee4f85a15b70b3f02a1b68b7">853210f2</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:32:03-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">show gcc linker options in configure summary
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2831544aaab15ab17d66e7af42f890d92d47407a">2831544a</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:32:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: docs depend on stage1 ghc
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d9df9e00b021724d570a12d8c6d7870bdc054ca">1d9df9e0</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:33:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci: after 5ce63d52fed the linux bindist for doc-tarball has changed name
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/26e8fff33b1b46ba559538b4519730c60c0d45e5">26e8fff3</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-24T02:05:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Ord SrcLoc, Ord SrcSpan
Before this patch, GHC relied on Ord SrcSpan to identify source elements, by
using SrcSpan as Map keys:
blackList :: Map SrcSpan () -- compiler/GHC/HsToCore/Coverage.hs
instanceMap :: Map SrcSpan Name -- compiler/GHC/HsToCore/Docs.hs
Firstly, this design is not valid in presence of UnhelpfulSpan, as it
distinguishes between UnhelpfulSpan "X" and UnhelpfulSpan "Y", but those
strings are messages for the user, unfit to serve as identifiers for source
elements.
Secondly, this design made it hard to extend SrcSpan with additional data.
Recall that the definition of SrcSpan is:
data SrcSpan =
RealSrcSpan !RealSrcSpan
| UnhelpfulSpan !FastString
Say we want to extend the RealSrcSpan constructor with additional information:
data SrcSpan =
RealSrcSpan !RealSrcSpan !AdditionalInformation
| UnhelpfulSpan !FastString
getAdditionalInformation :: SrcSpan -> AdditionalInformation
getAdditionalInformation (RealSrcSpan _ a) = a
Now, in order for Map SrcSpan to keep working correctly, we must *ignore* additional
information when comparing SrcSpan values:
instance Ord SrcSpan where
compare (RealSrcSpan r1 _) (RealSrcSpan r2 _) = compare r1 r2
...
However, this would violate an important law:
a == b therefore f a == f b
Ignoring AdditionalInformation in comparisons would mean that with
f=getAdditionalInformation, the law above does not hold.
A more robust design is to avoid Ord SrcSpan altogether, which is what this patch implements.
The mappings are changed to use RealSrcSpan instead:
blackList :: Set RealSrcSpan -- compiler/GHC/HsToCore/Coverage.hs
instanceMap :: Map RealSrcSpan Name -- compiler/GHC/HsToCore/Docs.hs
All SrcSpan comparisons are now done with explicit comparison strategies:
SrcLoc.leftmost_smallest
SrcLoc.leftmost_largest
SrcLoc.rightmost_smallest
These strategies are not subject to the law mentioned above and can easily
discard both the string stored in UnhelpfulSpan and AdditionalInformation.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aa6c18866cf4071246891da3b0f7651b5d28d0f">5aa6c188</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Shuffle text
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3f1741356491332613aacf66c96991682b84603">e3f17413</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Drop old release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84dd96105faff71cb17d1c1d069d724d014847dc">84dd9610</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump directory submodule to 1.3.6.0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e295a02440db8b1d96cebad22c5ee48774774681">e295a024</a></strong>
<div>
<span>by Stefan Pavikevik</span>
<i>at 2020-02-24T20:53:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">check for safe arguments, raising error when invalid (fix #17720)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/354e2787be08fb6d973de1a39e58080ff8e107f8">354e2787</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-24T20:54:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments, small refactor
* Remove outdated Note [HsForAllTy tyvar binders] and [Context quantification].
Since the wildcard refactor 1e041b7382, HsForAllTy no longer has an flag
controlling explicity. The field `hsq_implicit` is gone too.
The current situation is covered by Note [HsType binders] which is already
linked from LHsQTyVars.
* Small refactor in CoreLint, extracting common code to a function
* Remove "not so sure about WpFun" in TcEvidence, per Richard's comment
https://gitlab.haskell.org/ghc/ghc/merge_requests/852#note_223226
* Use mkIfThenElse in Foreign/Call, as it does exactly what we need.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b1067d14b656bbbfa7c47f156ec2700c9751549">1b1067d1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-24T20:55:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: CmmToAsm (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/621468f680a111c20366a9445a3b225cbc34ffbf">621468f6</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-02-26T15:08:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Treat coercions as arguments for floating and inlining
This reverts commit 8924224ecfa065ebc67b96a90d01cf9d2edd0e77
and fixes #17787.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/def486c90ef6f37d81d0d9c6df754431ff94c6a4">def486c9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Allow libnuma library path to be specified
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed03d4e76ead6384e38bb742fee73905d92d1545">ed03d4e7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Refactor gmp arguments
Move the gmp configuration to its own binding.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09b8838422d5dde32af7b09c8adcb4dff4cd00fb">09b88384</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Tell Cabal about integer-gmp library location
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/161e08c5d85d7ee7f731db31481cd818480f07a7">161e08c5</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-26T15:09:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code
* FailablePattern can no longer be created since ab51bee40c82
Therefore, Opt_WarnMissingMonadFailInstances has no effect anymore.
* XWrap is no longer used, it was moved to an extension field
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0d09db377bcb3d4caef2abe9db0cac36811d740">e0d09db3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use 8.8.3 to bootstrap on Windows
This should fix #17861.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/972bcf3a1971691ec809452322404ce8f65ad721">972bcf3a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix symlink test
Needs to `write` bytes, not str.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/273e60dee183707315415799ae3ed08079ab9ee9">273e60de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add shell subcommand for debugging within CI environment
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/43b13ed33f50274383a8dce11cbd7c77b8e851d5">43b13ed3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix colors on Darwin
Darwin sh doesn't support \e.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/217546a798e1eb5a931a677771bbd54bb0e4b5ee">217546a7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Flush stdout buffers in InitEventLogging
Otherwise we are sensitive to libc's buffering strategy.
Similar to the issue fixed in 543dfaab166c81f46ac4af76918ce32190aaab22.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7d4fa55d19f7ac72f3071f9d19e03443c9b538c">c7d4fa55</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add run_hadrian subcommand
I've ruined two trees already by failing to pass --flavour to hadrian.
Let's factor this out so it can be reused during troubleshooting.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7dc54873c0768ad3234c40300ae20e4f1e847bdd">7dc54873</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Allow tests to be marked as broken on the command line
This allows us to work-around distribution-specific breakage easily.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25e2458ee9e8007687c165fe6b27adf91f405ed0">25e2458e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add --broken-test flag
This exposes the flag of the same name supported by the testsuite
driver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/557699967f9438d3bf2936cbc6edce55b11622e0">55769996</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Mark some tests as broken on Alpine
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ee7f87dbea786259d12fb9177fd2759d4fad3bb">9ee7f87d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Don't use process jobs if they are broken
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfaa39618a25ae642221a478889b9667281b52e8">bfaa3961</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
Fixes name of C compiler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2b49a0aad353201678970c76d8305a5dcb1bfab">b2b49a0a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Make hasMetricsFile RHS more descriptive
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/817f93eac4d13f680e8e3e7a25eb403b1864f82e">817f93ea</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-26T15:10:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core (#13009)
Update haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74311e10bbb6ced9cd3093c8949f2535a715d8f6">74311e10</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-27T16:22:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Implement Long-distance information with Covered sets
Consider
```hs
data T = A | B | C
f :: T -> Int
f A = 1
f x = case x of
A -> 2
B -> 3
C -> 4
```
Clearly, the RHS returning 2 is redundant. But we don't currently see
that, because our approximation to the covered set of the inner case
expression just picks up the positive information from surrounding
pattern matches. It lacks the context sensivity that `x` can't be `A`
anymore!
Therefore, we adopt the conceptually and practically superior approach
of reusing the covered set of a particular GRHS from an outer pattern
match. In this case, we begin checking the `case` expression with the
covered set of `f`s second clause, which encodes the information that
`x` can't be `A` anymore. After this MR, we will successfully warn about
the RHS returning 2 being redundant.
Perhaps surprisingly, this was a great simplification to the code of
both the coverage checker and the desugarer.
Found a redundant case alternative in `unix` submodule, so we have to
bump it with a fix.
Metric Decrease:
T12227
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59c023ba5ccb10fff62810591f20608bd73c97af">59c023ba</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-27T16:23:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: correctly generate LIBRARY_template_haskell_VERSION
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9be82389a702c09d03975e7a0c17e5866dc17ffc">9be82389</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-28T02:35:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">boot: Remove remote origin check
Previously, we used relative paths in submodules. When cloning from
GitHub, they had to be manually tweaked.
Since a76b233d we use absolute paths, so this workaround can be removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4b6b594fae6b257e997ade3fae67b3378e54a22">f4b6b594</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-28T02:36:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix marking in compact regions
Previously we were tracing the object we were asked to mark, even if it
lives in a compact region. However, there is no need to do this; we need
only to mark the region itself as live.
I have seen a segfault due to this due to the concurrent mark seeing a
an object in the process of being compacted by the mutator.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f97d1fb614ff7638d13eb7c552d2a72fce4c613a">f97d1fb6</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-28T02:36:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: use an explicit import list in System.Environment.ExecutablePath
This was making -Werror builds fail on Windows (at least with Hadrian).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66f5d6d634698ce054a9b9ce0c53ce9682f6f042">66f5d6d6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-28T22:03:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve error handling for VTA + deferred type errors
This fixes #17792
See Note [VTA for out-of-scope functions] in TcExpr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37f126033f1e5bf0331143f005ef90ba6e2e02cd">37f12603</a></strong>
<div>
<span>by Ilias Tsitsimpis</span>
<i>at 2020-02-28T22:04:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvm-targets: Add arm-unknown-linux-gnueabi
Add arm-unknown-linux-gnueabi, which is used by Debian's ARM EABI port
(armel), as an LLVM target.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/327b29e1a05d9f1ea04465c9b23aed92473dd453">327b29e1</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-29T05:06:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Monotonic locations (#17632)
When GHC is parsing a file generated by a tool, e.g. by the C preprocessor, the
tool may insert #line pragmas to adjust the locations reported to the user.
As the result, the locations recorded in RealSrcLoc are not monotonic. Elements
that appear later in the StringBuffer are not guaranteed to have a higher
line/column number.
In fact, there are no guarantees whatsoever, as #line pragmas can arbitrarily
modify locations. This lack of guarantees makes ideas such as #17544
infeasible.
This patch adds an additional bit of information to every SrcLoc:
newtype BufPos = BufPos { bufPos :: Int }
A BufPos represents the location in the StringBuffer, unaffected by any
pragmas.
Updates haddock submodule.
Metric Increase:
haddock.Cabal
haddock.base
haddock.compiler
MultiLayerModules
Naperian
parsing001
T12150
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99d2de860ff82e3f626c8b3d47d355ab16d18fd1">99d2de86</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-29T05:07:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">plugins: Ensure that loadInterface plugins can see annotations
loadInterface replaces the `mi_decls`, `mi_insts`, `mi_fam_insts`,
`mi_rules`, `mi_anns` fields of ModIface with `undefined` before
inserting the interface into the EPS. However, we still want to give
loadInterface plugins access to these fields. Consequently, we want to
pass the unmodified `ModIface` the plugin.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a999ee96a22650b59855609f84e2808b4133e9e0">a999ee96</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-02-29T05:07:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename ghci.sh and build.sh to ghci and build respectively
Convert hadrian buildscripts to unsuffixed, dashed form
final cleanups
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5fb58fd1a4a24b9273d9d2de65b6347e1654e98">b5fb58fd</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-29T05:08:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document and refactor a few things around bitmap scavenging
- Added a few comments in StgPAP
- Added a few comments and assertions in scavenge_small_bitmap and
walk_large_bitmap
- Did tiny refactor in GHC.Data.Bitmap: added some comments, deleted
dead code, used PlatformWordSize type.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18757cab04c5c5c48eaceea19469d4811c5d0371">18757cab</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-29T05:09:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor runtime interpreter code
In #14335 we want to be able to use both the internal interpreter (for
the plugins) and the external interpreter (for TH and GHCi) at the same
time.
This patch performs some preliminary refactoring: the `hsc_interp` field
of HscEnv replaces `hsc_iserv` and is now used to indicate which
interpreter (internal, external) to use to execute TH and GHCi.
Opt_ExternalInterpreter flag and iserv options in DynFlags are now
queried only when we set the session DynFlags. It should help making GHC
multi-target in the future by selecting an interpreter according to the
selected target.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b86a639504e1de79c861a2c11b897089cc63ae5f">b86a6395</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-29T05:10:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: correct relative links to haddocks from users guide (fixes #17866)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f55df7f197b7e30d7c6e39d80deb36b7dc86fb5">0f55df7f</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-29T05:10:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: correct link to th haddocks from users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/252e51179bd179f52e25dea762ef7b95bc56ce0a">252e5117</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-02-29T05:10:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: enforce POSIX numeric locale for heap profiles
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34c7d23074f47c720b5722ca14d78a34213eabb6">34c7d230</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-29T05:11:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Hadrian's ``--configure`` (fix #17883)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04d30137771a6cf8a18fda1ced25f78d0b2eb204">04d30137</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-29T05:12:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify IfaceIdInfo type
IfaceIdInfo type is confusing: there's practically no difference between
`NoInfo` and `HasInfo []`. The comments say NoInfo is used when
-fomit-interface-pragmas is enabled, but we don't need to distinguish
`NoInfo` from `HasInfo []` in when reading the interface so the
distinction is not important.
This patch simplifies the type by removing NoInfo. When we have no info
we use an empty list.
With this change we no longer read the info list lazily when reading an
IfaceInfoItem, but when reading an IfaceId the ifIdInfo field is
read lazily, so I doubt this is going to be a problem.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3979485bd97771373214c44d14b7830ba447ad23">3979485b</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-29T17:36:59+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Show breakpoint locations of breakpoints which were ignored during :force (#2950)
GHCi is split up into 2 major parts: The user-interface (UI)
and the byte-code interpreter. With `-fexternal-interpreter`
they even run in different processes. Communication between
the UI and the Interpreter (called `iserv`) is done using
messages over a pipe. This is called `Remote GHCI` and
explained in the Note [Remote GHCi] in `compiler/ghci/GHCi.hs`.
To process a `:force` command the UI sends a `Seq` message
to the `iserv` process. Then `iserv` does the effective
evaluation of the value. When during this process a breakpoint
is hit, the `iserv` process has no additional information to
enhance the `Ignoring breakpoint` output with the breakpoint
location.
To be able to print additional breakpoint information,
there are 2 possible implementation choices:
1. Store the needed information in the `iserv` process.
2. Print the `Ignoring breakpoint` from the UI process.
For option 1 we need to store the breakpoint info redundantely
in 2 places and this is bad. Therfore option 2 was implemented
in this MR:
- The user enters a `force` command
- The UI sends a `Seq` message to the `iserv` process.
- If processing of the `Seq` message hits a breakpoint,
the `iserv` process returns control to the UI process.
- The UI looks up the source location of the breakpoint,
and prints the enhanced `Ignoring breakpoint` output.
- The UI sends a `ResumeSeq` message to the `iserv` process,
to continue forcing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cf7303bf39bca734bd87f0f42872f1a4025fa34">3cf7303b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-02T01:18:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code
* The names in PrelName and THNames are no longer used
since TH merged types and kinds, Typeable is kind-polymorphic,
.net support was removed
* unqualQuasiQuote no longer used since 6f8ff0bbad3b9fa3
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dbea7e9d4d4a8812f3dbeed720fb6aa97e16f896">dbea7e9d</a></strong>
<div>
<span>by Ilias Tsitsimpis</span>
<i>at 2020-03-02T01:19:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not define hs_atomic{read,write}64() on non-64bit
Do not define hs_atomicread64() and hs_atomicwrite64() on machines where
WORD_SIZE_IN_BITS is less than 64, just like we do with the rest of the atomic
functions which work on 64-bit values.
Without this, compilation fails on MIPSel and PowerPC with the following error:
/usr/bin/ld: /<<PKGBUILDDIR>>/libraries/ghc-prim/dist-install/build/libHSghc-prim-0.5.3_p.a(atomic.p_o): in function `hs_atomicread64':
atomic.c:(.text.hs_atomicread64+0x8): undefined reference to `__sync_add_and_fetch_8'
/usr/bin/ld: /<<PKGBUILDDIR>>/libraries/ghc-prim/dist-install/build/libHSghc-prim-0.5.3_p.a(atomic.p_o): in function `hs_atomicwrite64':
atomic.c:(.text.hs_atomicwrite64+0x38): undefined reference to `__sync_bool_compare_and_swap_8'
Fixes #17886.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c0c76fb1a11532076a0342655a9c889a2a12768">7c0c76fb</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-03-02T17:13:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Set `ImpredicativeTypes` during :print command. (#14828)
If ImpredicativeTypes is not enabled, then `:print <term>` will fail if the
type of <term> has nested `forall`s or `=>`s.
This is because the GHCi debugger's internals will attempt to unify a
metavariable with the type of <term> and then display the result, but if the
type has nested `forall`s or `=>`s, then unification will fail.
As a result, `:print` will bail out and the unhelpful result will be
`<term> = (_t1::t1)` (where `t1` is a metavariable).
Beware: <term> can have nested `forall`s even if its definition doesn't use
RankNTypes! Here is an example from #14828:
class Functor f where
fmap :: (a -> b) -> f a -> f b
Somewhat surprisingly, `:print fmap` considers the type of fmap to have
nested foralls. This is because the GHCi debugger sees the type
`fmap :: forall f. Functor f => forall a b. (a -> b) -> f a -> f b`.
We could envision deeply instantiating this type to get the type
`forall f a b. Functor f => (a -> b) -> f a -> f b`,
but this trick wouldn't work for higher-rank types.
Instead, we adopt a simpler fix: enable `ImpredicativeTypes` when using
`:print` and friends in the GHCi debugger. This is allows metavariables
to unify with types that have nested (or higher-rank) `forall`s/`=>`s,
which makes `:print fmap` display as
`fmap = (_t1::forall a b. Functor f => (a -> b) -> f a -> f b)`, as expected.
Although ImpredicativeTypes is a somewhat unpredictable from a type inference
perspective, there is no danger in using it in the GHCi debugger, since all
of the terms that the GHCi debugger deals with have already been typechecked.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a2f51d79f145e015cc089d97cf71c19dd27bee4">2a2f51d7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-02T17:14:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use configure script to detect that we should use in-tree GMP on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8c663c2c2ff0d79b2c7cfadb0ce961339f1e7e4c">8c663c2c</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-04T16:12:14+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Be explicit about how stack usage of mvar primops are covered.
This fixes #17893
[skip-ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cedd6f3041de6abe64dfa3257bec7730a9dced9f">cedd6f30</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add getCurrentThreadCPUTime helper
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ace618cd2294989e783bd453cee88e0e1c0dad77">ace618cd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving-gc: Track time usage of nonmoving marking
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/022b5ad5775ecf6652e663cddb2773d7230385f2">022b5ad5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Stats: Add sync pauses to +RTS -S output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/067632342cf2f063b0f23c255740e2717e5e14c7">06763234</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Report nonmoving collector statistics in machine-readable output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70d2b9956d1ecc9d40d1e2d4920983af00ea846d">70d2b995</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-09T06:10:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix collection of sparks
Previously sparks living in the non-moving heap would be promptly GC'd
by the minor collector since pruneSparkQueue uses the BF_EVACUATED flag,
which non-moving heap blocks do not have set.
Fix this by implementing proper support in pruneSparkQueue for
determining reachability in the non-moving heap. The story is told in
Note [Spark management in the nonmoving heap].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9668781a36941e7552fcec38f6d4e1d5ec3ef6d1">9668781a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-09T06:11:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable Sphinx documentation in Alpine build</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8eb2c2639494bed3326163df52fa13de941cd047">8eb2c263</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Windows breakage by not touching locales on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8dab057f0730a324b7cb7b74a11152f6b96a889">b8dab057</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: ensure C numerics in heap profiles using Windows locales if needed
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d95260f0b9a91186eb6a99d6235151a22b2c5ae">7d95260f</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: refactor and comment profile locales
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b62781336aff0007aa5fde261c3028a82543a09">5b627813</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-09T16:34:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use InstanceSigs in GND/DerivingVia-generated code (#17899)
Aside from making the generated code easier to read when
`-ddump-deriv` is enabled, this makes the error message in `T15073`
substantially simpler (see the updated `T15073` expected stderr).
Fixes #17899.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70b5077820a0859d22edd29885b62eef3c363058">70b50778</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-10T02:05:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Ensure that error parser can handle absolute paths on Windows
This fixes #17786, where the error parser fails to correctly handle the
drive name in absolute Windows paths.
Unfortunately I couldn't find a satisfactory way to test this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85b861d822251486fdf900ee951c275ebd8dfcb3">85b861d8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-10T02:05:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17786
This isn't pretty but it's perhaps better than nothing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee2c50cbeead0d865a02a963f3f3c72e298398d7">ee2c50cb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-10T02:06:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: track missing configure results
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca8f51d475a69583a228f118e6b9dac98ba483d3">ca8f51d4</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-10T02:07:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for T17904
Closes #17904
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5fa9cb82223de1c1c2684aa6917bf85a2e3c6469">5fa9cb82</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-10T12:29:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">anyRewritableTyVar now looks in RuntimeReps
Previously, anyRewritableTyVar looked only at the arg and res
of `arg -> res`, but their RuntimeReps are also subject to
rewriting. Easy to fix.
Test case: typecheck/should_compile/T17024
Fixes #17024.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ba01d83a2078acce789a9d5f111efa4d4ffc616">5ba01d83</a></strong>
<div>
<span>by Ben Price</span>
<i>at 2020-03-10T12:30:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify a Lint message
When developing a plugin I had a shadowing problem, where I generated
code
app = \f{v r7B} x{v r7B} -> f{v r7B} x{v r7B}
This is obviously wrong, since the occurrence of `f` to the right of the
arrow refers to the `x` binder (they share a Unique). However, it is
rather confusing when Lint reports
Mismatch in type between binder and occurrence
Var: x{v rB7}
since it is printing the binder, rather than the occurrence.
It is rather easy to read this as claiming there is something wrong with
the `x` occurrence!
We change the report to explicitly print both the binder and the
occurrence variables.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b2c827b7b68f0ade7f4ae66e7033fdb84d75a5f">7b2c827b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-10T12:31:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
Clarify code added in #17852 and MR !2724
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3300eeacbbf7a3d1f961f809be5d236c48827b28">3300eeac</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-10T12:31:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Misc cleanup
- Remove Note [Existentials in shift_con_pat].
The function shift_con_pat has been removed 15 years ago in 23f40f0e9be6d4.
- Remove kcLookupTcTyCon - it's the same as tcLookupTcTyCon
- Remove ASSERT in tyConAppArgN. It's already done by getNth,
and it's the only reason getNth exists.
- Remove unused function nextRole
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abf5736bcad2d740b5854e2e4a9b3547b9b06639">abf5736b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-10T18:05:01+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Typos in comments [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb586f894532baf1bcb822afd0df7f9fea198671">bb586f89</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-11T00:14:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Prefer darwin-specific getCurrentThreadCPUTime
macOS Catalina now supports a non-POSIX-compliant version of clock_gettime
which cannot use the clock_gettime codepath.
Fixes #17906.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20800b9a9e88a8784a3ee8720544f504aba7b4f7">20800b9a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T08:17:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split GHC.Iface.Utils module
* GHC.Iface.Recomp: recompilation avoidance stuff
* GHC.Iface.Make: mkIface*
Moved `writeIfaceFile` into GHC.Iface.Load alongside `readIface` and
renamed it `writeIface` for consistency.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1daa20298880487b2a351c88f7ade840eb4632c6">1daa2029</a></strong>
<div>
<span>by Greg Steuck</span>
<i>at 2020-03-11T08:17:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fixed a minor typo in codegen.rst</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bc23338b02ffd624247ace409ab690b2b4a6186">0bc23338</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-11T08:18:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-quantify when generalising over rewrite rule types
Previously, `tcRules` would check for naughty quantification
candidates (see `Note [Naughty quantification candidates]` in
`TcMType`) when generalising over the type of a rewrite rule. This
caused sensible-looking rewrite rules (like those in #17710) to be
rejected. A more permissing (and easier-to-implement) approach is to
do what is described in `Note [Generalising in tcTyFamInstEqnGuts]`
in `TcTyClsDecls`: just re-quantify all the type variable binders,
regardless of the order in which the user specified them. After all,
the notion of type variable specificity has no real meaning in
rewrite rules, since one cannot "visibly apply" a rewrite rule.
I have written up this wisdom in
`Note [Re-quantify type variables in rules]` in `TcRules`.
As a result of this patch, compiling the `ExplicitForAllRules1` test
case now generates one fewer warning than it used to. As far as I can
tell, this is benign, since the thing that the disappearing warning
talked about was also mentioned in an entirely separate warning.
Fixes #17710.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/336eac7ef049ba9feab5a948120f0f732e26f773">336eac7e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-11T08:19:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark ghci056 and ghcilink004 as fragile in unreg
As noted in #17018.
Also fix fragile declaration of T13786, which only runs in the normal
way.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c61b9b02925acf248cde1ec0f67730c1a6f6c6e5">c61b9b02</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-11T08:19:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deepen call stack for isIn
I see quite a few warnings like:
WARNING: file compiler/utils/Util.hs, line 593
Over-long elem in unionLists
But the call stack is uninformative. Better to add HasDebugCallStack
to isIn. Ditto isn'tIn.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3aa9b35fcc417ab39d8da633482fe64dc9f898b1">3aa9b35f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-11T08:20:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Zero any slop after compaction in compacting GC
In copying GC, with the relevant debug flags enabled, we release the old
blocks after a GC, and the block allocator zeroes the space before
releasing a block. This effectively zeros the old heap.
In compacting GC we reuse the blocks and previously we didn't zero the
unused space in a compacting generation after compaction. With this
patch we zero the slop between the free pointer and the end of the block
when we're done with compaction and when switching to a new block
(because the current block doesn't have enough space for the next object
we're shifting).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e6febcee4b91a88a5027baac4bee5a8847fe79b">8e6febce</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor GHC.Driver.Session (Ways and Flags)
* extract flags and ways into their own modules (with some renaming)
* remove one SOURCE import of GHC.Driver.Session from GHC.Driver.Phases
* when GHC uses dynamic linking (WayDyn), `interpWays` was only
reporting WayDyn even if the host was profiled (WayProf). Now it
returns both as expected (might fix #16803).
* `mkBuildTag :: [Way] -> String` wasn't reporting a canonical tag for
differently ordered lists. Now we sort and nub the list to fix this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc41e47123b205a45385a3aa69de97ce22686423">bc41e471</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor interpreterDynamic and interpreterProfiled
* `interpreterDynamic` and `interpreterProfiled` now take `Interp`
parameters instead of DynFlags
* slight refactoring of `ExternalInterp` so that we can read the iserv
configuration (which is pure) without reading an MVar.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a6989971379c26d8c288551d536149675e009e34">a6989971</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a Set to represent Ways
Should make `member` queries faster and avoid messing up with missing
`nubSort`.
Metric Increase:
hie002
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb93a1a4405b448e83cad973f93dab3f7f050736">cb93a1a4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-11T20:34:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make DeriveFunctor-generated code require fewer beta reductions
Issue #17880 demonstrates that `DeriveFunctor`-generated code is
surprisingly fragile when rank-_n_ types are involved. The culprit is
that `$fmap` (the algorithm used to generate `fmap` implementations)
was too keen on applying arguments with rank-_n_ types to lambdas,
which fail to typecheck more often than not.
In this patch, I change `$fmap` (both the specification and the
implementation) to produce code that avoids creating as many lambdas,
avoiding problems when rank-_n_ field types arise.
See the comments titled "Functor instances" in `TcGenFunctor` for a
more detailed description. Not only does this fix #17880, but it also
ensures that the code that `DeriveFunctor` generates will continue
to work after simplified subsumption is implemented (see #17775).
What is truly amazing is that #17880 is actually a regression
(introduced in GHC 7.6.3) caused by commit
49ca2a37bef18aa57235ff1dbbf1cc0434979b1e, the fix #7436. Prior to
that commit, the version of `$fmap` that was used was almost
identical to the one used in this patch! Why did that commit change
`$fmap` then? It was to avoid severe performance issues that would
arise for recursive `fmap` implementations, such as in the example
below:
```hs
data List a = Nil | Cons a (List a) deriving Functor
-- ===>
instance Functor List where
fmap f Nil = Nil
fmap f (Cons x xs) = Cons (f x) (fmap (\y -> f y) xs)
```
The fact that `\y -> f y` was eta expanded caused significant
performance overheads. Commit
49ca2a37bef18aa57235ff1dbbf1cc0434979b1e fixed this performance
issue, but it went too far. As a result, this patch partially
reverts 49ca2a37bef18aa57235ff1dbbf1cc0434979b1e.
To ensure that the performance issues pre-#7436 do not resurface,
I have taken some precautionary measures:
* I have added a special case to `$fmap` for situations where the
last type variable in an application of some type occurs directly.
If this special case fires, we avoid creating a lambda expression.
This ensures that we generate
`fmap f (Cons x xs) = Cons (f x) (fmap f xs)` in the derived
`Functor List` instance above. For more details, see
`Note [Avoid unnecessary eta expansion in derived fmap implementations]`
in `TcGenFunctor`.
* I have added a `T7436b` test case to ensure that the performance
of this derived `Functor List`-style code does not regress.
When implementing this, I discovered that `$replace`, the algorithm
which generates implementations of `(<$)`, has a special case that is
very similar to the `$fmap` special case described above. `$replace`
marked this special case with a custom `Replacer` data type, which
was a bit overkill. In order to use the same machinery for both
`Functor` methods, I ripped out `Replacer` and instead implemented
a simple way to detect the special case. See the updated commentary
in `Note [Deriving <$]` for more details.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f9db3e79bd0d70e5a1491174d540717f3bce2bf">1f9db3e7</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-03-12T09:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">pretty-printer: Properly parenthesise LastStmt
After ApplicatveDo strips the last `return` during renaming, the pretty
printer has to restore it. However, if the return was followed by `$`,
the dollar was stripped too and not restored.
For example, the last stamement in:
```
foo = do
x <- ...
...
return $ f x
```
would be printed as:
```
return f x
```
This commit preserved the dolar, so it becomes:
```
return $ f x
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5cb93af73499f9cee4a17427629840feb26171e5">5cb93af7</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-03-12T09:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">pretty-printer: Do not print ApplicativeDo join
* Do not print `join` in ApplictiveStmt, unless ppr-debug
* Print parens around multiple parallel binds
When ApplicativeDo is enabled, the renamer analyses the statements of a
`do` block and in certain cases marks them as needing to be rewritten
using `join`.
For example, if you have:
```
foo = do
a <- e1
b <- e2
doSomething a b
```
it will be desugared into:
```
foo = join (doSomething <$> e1 <*> e2)
```
After renaming but before desugaring the expression is stored
essentially as:
```
foo = do
[will need join] (a <- e1 | b <- e2)
[no return] doSomething a b
```
Before this change, the pretty printer would print a call to `join`,
even though it is not needed at this stage at all. The expression will be
actually rewritten into one using join only at desugaring, at which
point a literal call to join will be inserted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a259092a02e84d6b45da6b232cfc022898451a0">3a259092</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-12T09:46:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expose compulsory unfoldings always
The unsafeCoerce# patch requires that unsafeCoerce# has
a compulsory unfolding that is always available. So we have
to be careful to expose compulsory unfoldings unconditionally
and consistently.
We didn't get this quite right: #17871. This patch fixes
it. No real surprises here.
See Note [Always expose compulsory unfoldings] in GHC.Iface.Tidy
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a65b8c2f5b4bc7abdb0ca3b5876df694acb8194">6a65b8c2</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-03-13T02:29:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: improve dependency tracking for the check-* programs
The code in Rules.Register responsible for finding all the build artifacts
that Cabal installs when registering a library (static/shared libs, .hi files,
...) was looking in the wrong place. This patch fixes that logic and makes sure
we gather all those artifacts in a list to declare that the rule for a given
`.conf` file, our proxy for "Hadrian, please install this package in the package
db for this stage", also produces those artifacts under the said package
database.
We also were completely missing some logic to declare that the check-* programs
have dependencies besides their source code, at least when testing an in-tree
compiler.
Finally, this patch also removes redundant packages from 'testsuitePackages',
since they should already be covered by the stage<N>Packages lists from
Settings.Default.
With this patch, after a complete build and freezing stage 1, a change to
`compiler/parser/Parser.y` results in rebuilding the ghc lib, reinstalling it,
and rebuilding the few programs that depend on it, _including_ `check-ppr` and
`check-api-annotations` (therefore fixing #17273).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44fad4a925c06fa2b14611ea08acea9210ee4e00">44fad4a9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-13T02:30:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename isDllName
I wanted to fix the dangling comment in `isDllName` ("This is the cause
of #", #8696 is already mentioned earlier). I took the opportunity to
change the function name to better reflect what it does.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f292db8f10134919c420b71b8a5eccd379212ad">2f292db8</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-13T02:31:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update documentation for closureSize
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f124ff0dfccced755ee97ecac027119269996f8f">f124ff0d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-13T02:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Rework triggering of release builds
Use a push option instead of tagging.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f25557a6f240943ebe3eb3b3c7178e76a3e93e1">7f25557a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-13T10:38:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Distinguish integer-simple test envs
Previously two integer-simple jobs declared the same test environment. One (the nightly job) was built in the perf way, the other in the validate way. Consequently they had appreciably different performance characteristics, causing in the nightly job to spuriously fail with performance changes.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c12a2ec5fe4e7f94d565c0e6398d1d79854db146">c12a2ec5</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:25:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Lint
Ticket #17590 pointed out a bug in the way the linter dealt with
type lets, exposed by the new uniqAway story.
The fix is described in Note [Linting type lets]. I ended up
putting the in-scope Ids in a different env field, le_ids,
rather than (as before) sneaking them into the TCvSubst.
Surprisingly tiresome, but done.
Metric Decrease:
hie002
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b989845e378081f0932a7fec528e68daeeaa14fb">b989845e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:26:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix absolute buildroot support (#17822)
Shake's "**" wildcard doesn't match absolute root. We must use "//" instead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f117135673b36816c343bc11efcbb8396160c75">4f117135</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:26:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make: refactor GMP rules
Document and use simpler rules for the ghc-gmp.h header.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7432b327a3c43c4e2e7c777b41a8e17899b8d0d1">7432b327</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:27:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use correct option name (-opti) (fix #17314)
s/pgmo/opti
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f7dd5710b80906ea7a3e15b7bb56a883a49fed8">8f7dd571</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-14T05:28:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow overriding LD_STAGE0 and AR_STAGE0 in the configure script.
Previously it was possible to override the stage0 C compiler via `CC_STAGE0`,
but you couldn't override `ld` or `ar` in stage0. This change allows overriding them
by setting `LD_STAGE0` or `AR_STAGE0`, respectively.
Our team uses this feature internally to take more control of our GHC build
and make it run more hermetically.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c3e39a9a7ccb3b6c2953b0397a0d315dc0ec7d5">7c3e39a9</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-14T05:28:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use AC_ARG_VAR for LD_STAGE0 and AR_STAGE0.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20d4d676964382b313b9e44062e45a7c38621999">20d4d676</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:28:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Don't traverse filled segment list in pause
The non-moving collector would previously walk the entire filled segment
list during the preparatory pause. However, this is far more work than
is strictly necessary. We can rather get away with merely collecting the
allocators' filled segment list heads and process the lists themselves
during the concurrent phase. This can significantly reduce the maximum
gen1 GC pause time in programs with high rates of long-lived allocations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdfa2d0121ca8cc22479dd17a74afa58fc2b39f5">fdfa2d01</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:29:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Remove redundant bitmap clearing
nonmovingSweep already clears the bitmap in the sweep loop. There is no
reason to do so a second time.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f8c77673f1faf0d8fed6df2bdd1ca15d696a010">2f8c7767</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:29:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simple refactor of cheapEqExpr
No change in functionality. Just seems tidier (and signficantly more
efficient) to deal with ticks directly than to call stripTicksTopE.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88f7a76208b0fcf41ca0e16d18a71523f0601ee5">88f7a762</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:29:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve CSE.combineAlts
This patch improves the way that CSE combines identical
alternatives. See #17901.
I'm still not happy about the duplication between CSE.combineAlts
and GHC.Core.Utils.combineIdenticalAlts; see the Notes with those
functions. But this patch is a step forward.
Metric Decrease:
T12425
T5642
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b95ddd3f20a67acf5251347d80f9cab191bdfc4">8b95ddd3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:30:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add integer-simple release build for Windows
Closes #16144.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3c374cc5bd7eb49649b9f507f9f7740697e3f70">e3c374cc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:31:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wrap an implication around class-sig kind errors
Ticket #17841 showed that we can get a kind error
in a class signature, but lack an enclosing implication
that binds its skolems.
This patch
* Adds the wrapping implication: the new call to
checkTvConstraints in tcClassDecl1
* Simplifies the API to checkTvConstraints, which
was not otherwise called at all.
* Simplifies TcErrors.report_unsolved by *not*
initialising the TidyEnv from the typechecker lexical
envt. It's enough to do so from the free vars of the
unsolved constraints; and we get silly renamings if
we add variables twice: once from the lexical scope
and once from the implication constraint.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73133a3b601b76c46098fb8ad3c76de5fe04c9b2">73133a3b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:31:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring in TcSMonad
This patch is just refactoring: no change in
behaviour.
I removed the rather complicated
checkConstraintsTcS
checkTvConstraintsTcS
in favour of simpler functions
emitImplicationTcS
emitTvImplicationTcS
pushLevelNoWorkList
The last of these is a little strange, but overall
it's much better I think.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93c88c266eacd80a7f2a1754778167390c287b18">93c88c26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:31:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Make `open` calls interruptible
As noted in #17912, `open` system calls were `safe` rather than
`interruptible`. Consequently, the program could not be interrupted with
SIGINT if stuck in a slow open operation. Fix this by marking
`c_safe_open` as interruptible.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bee4cdad4ce68a5bbe6af493d99f0197a34eef5c">bee4cdad</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-03-14T05:32:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove second tcLookupTcTyCon in tcDataDefn
Before this patch, tcDataDefn used to call tcLookupTcTyCon twice in a row:
1. in bindTyClTyVars itself
2. in the continuation passed to it
Now bindTyClTyVars passes the TcTyCon to the continuation, making
the second lookup unnecessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f116d35a5b028ae2bb22da5063900d2f3d0b476">3f116d35</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-03-14T19:34:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable stage1 build of haddock
The submodule has already been bumped to contain the fix.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49e9d7395a13584f15798bce1601b8d3a6633f11">49e9d739</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-14T19:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix printClosure when printing fwd ptrs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1de3ab4a147eeb0b34b24a3c0e91f174e6e5cb79">1de3ab4a</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-14T19:36:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused field var_inline (#17915)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d30aeb4b38381758025bc1002eb2135ad6bc58b8">d30aeb4b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-15T03:57:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document restriction on SCC pragma syntax
Currently, the names of cost centres must be quoted or
be lowercase identifiers.
Fixes #17916.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4774598e6bd060b1b4230b11b734ca40022980d">b4774598</a></strong>
<div>
<span>by Brian Foley</span>
<i>at 2020-03-15T03:58:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove some dead code
>From the notes.ghc.drop list found using weeder in #17713
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd6ffe6be742cf3ec98406704fef53ad86cc1560">dd6ffe6b</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2020-03-15T03:58:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Note platform-specific Foreign.C.Types in context
Also fix the markup in the general note at the top of the module. Haddock
(usability trade-off), does not support multi-line emphasised text.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e82465fff5851f00449131fdc8bacd3ca95f90f">2e82465f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-15T10:57:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CmmToAsm (disentangle DynFlags)
This patch disentangles a bit more DynFlags from the native code
generator (CmmToAsm).
In more details:
- add a new NCGConfig datatype in GHC.CmmToAsm.Config which contains the
configuration of a native code generation session
- explicitly pass NCGConfig/Platform arguments when necessary
- as a consequence `sdocWithPlatform` is gone and there are only a few
`sdocWithDynFlags` left
- remove the use of `unsafeGlobalDynFlags` from GHC.CmmToAsm.CFG
- remove `sdocDebugLevel` (now we pass the debug level via NCGConfig)
There are still some places where DynFlags is used, especially because
of pretty-printing (CLabel), because of Cmm helpers (such as
`cmmExprType`) and because of `Outputable` instance for the
instructions. These are left for future refactoring as this patch is
already big.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c35c545d3f32f092c52052349f741739a844ec0f">c35c545d</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-15T10:57:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a -no-haddock flag.
This flag undoes the effect of a previous "-haddock" flag. Having both flags makes it easier
for build systems to enable Haddock parsing in a set of global flags, but then disable it locally for
specific targets (e.g., third-party packages whose comments don't pass the validation in the latest GHC).
I added the flag to expected-undocumented-flags.txt since `-haddock` was alreadyin that list.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cfcc3c9a1f2e4e33bed4c40767f8e7971e331c15">cfcc3c9a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-15T10:58:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix global_link of TSOs for threads reachable via dead weaks
Fixes #17785
Here's how the problem occurs:
- In generation 0 we have a TSO that is finished (i.e. it has no more
work to do or it is killed).
- The TSO only becomes reachable after collectDeadWeakPtrs().
- After collectDeadWeakPtrs() we switch to WeakDone phase where we don't
move TSOs to different lists anymore (like the next gen's thread list
or the resurrected_threads list).
- So the TSO will never be moved to a generation's thread list, but it
will be promoted to generation 1.
- Generation 1 collected via mark-compact, and because the TSO is
reachable it is marked, and its `global_link` field, which is bogus at
this point (because the TSO is not in a list), will be threaded.
- Chaos ensues.
In other words, when these conditions hold:
- A TSO is reachable only after collectDeadWeakPtrs()
- It's finished (what_next is ThreadComplete or ThreadKilled)
- It's retained by mark-compact collector (moving collector doesn't
evacuate the global_list field)
We end up doing random mutations on the heap because the TSO's
global_list field is not valid, but it still looks like a heap pointer
so we thread it during compacting GC.
The fix is simple: when we traverse old_threads lists to resurrect
unreachable threads the threads that won't be resurrected currently
stays on the old_threads lists. Those threads will never be visited
again by MarkWeak so we now reset the global_list fields. This way
compacting GC does not thread pointers to nowhere.
Testing
-------
The reproducer in #17785 is quite large and hard to build, because of
the dependencies, so I'm not adding a regression test.
In my testing the reproducer would take a less than 5 seconds to run,
and once in every ~5 runs would fail with a segfault or an assertion
error. In other cases it also fails with a test failure. Because the
tests never fail with the bug fix, assuming the code is correct, this
also means that this bug can sometimes lead to incorrect runtime
results.
After the fix I was able to run the reproducer repeatedly for about an
hour, with no runtime crashes or test failures.
To run the reproducer clone the git repo:
$ git clone https://github.com/osa1/streamly --branch ghc-segfault
Then clone primitive and atomic-primops from their git repos and point
to the clones in cabal.project.local. The project should then be
buildable using GHC HEAD. Run the executable `properties` with `+RTS -c
-DZ`.
In addition to the reproducer above I run the test suite using:
$ make slowtest EXTRA_HC_OPTS="-debug -with-rtsopts=-DS \
-with-rtsopts=-c +RTS -c -RTS" SKIPWAY='nonmoving nonmoving_thr'
This enables compacting GC always in both GHC when building the test
programs and when running the test programs, and also enables sanity
checking when running the test programs. These set of flags are not
compatible for all tests so there are some failures, but I got the same
set of failures with this patch compared to GHC HEAD.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/818b3c38e7548f4720815f76969238d82c9650f7">818b3c38</a></strong>
<div>
<span>by Lysxia</span>
<i>at 2020-03-16T23:52:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: add strict IO functions: readFile', getContents', hGetContents'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18a346a4b5a02b8c62e8eedb91b35c2d8e754b96">18a346a4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-16T23:53:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core (#13009)
Update submodule: haddock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92327e3afd9d2650c9cc9610297d40c2712da085">92327e3a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-16T23:54:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update sanity checking for TSOs:
- Remove an invalid assumption about GC checking what_next field. The GC
doesn't care about what_next at all, if a TSO is reachable then all
its pointers are followed (other than global_tso, which is only
followed by compacting GC).
- Remove checkSTACK in checkTSO: TSO stacks will be visited in
checkHeapChain, or checkLargeObjects etc.
- Add an assertion in checkTSO to check that the global_link field is
sane.
- Did some refactor to remove forward decls in checkGlobalTSOList and
added braces around single-statement if statements.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e1aa40525ddac370766907a49682976e2ea78422">e1aa4052</a></strong>
<div>
<span>by PHO</span>
<i>at 2020-03-17T07:36:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use non-portable operator "==" in configure.ac
The test operator "==" is a Bash extension and produces a wrong result
if /bin/sh is not Bash.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89f034ddeb4ad7d93c877d5bdbcf2cca7a44f79c">89f034dd</a></strong>
<div>
<span>by Maximilian Tagher</span>
<i>at 2020-03-17T07:36:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document the units of -ddump-timings
Right now, in the output of -ddump-timings to a file, you can't tell what the units are:
```
CodeGen [TemplateTestImports]: alloc=22454880 time=14.597
```
I believe bytes/milliseconds are the correct units, but confirmation would be appreciated. I'm basing it off of this snippet from `withTiming'`:
```
when (verbosity dflags >= 2 && prtimings == PrintTimings)
$ liftIO $ logInfo dflags (defaultUserStyle dflags)
(text "!!!" <+> what <> colon <+> text "finished in"
<+> doublePrec 2 time
<+> text "milliseconds"
<> comma
<+> text "allocated"
<+> doublePrec 3 (realToFrac alloc / 1024 / 1024)
<+> text "megabytes")
```
which implies time is in milliseconds, and allocations in bytes (which divided by 1024 would be KB, and again would be MB)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/beffa14771ebd6ba24b20337f29045364621c5fa">beffa147</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-17T07:37:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement mapTyCo like foldTyCo
This patch makes mapType use the successful idiom described
in TyCoRep
Note [Specialising foldType]
I have not yet changed any functions to use mapType, though there
may be some suitable candidates.
This patch should be a no-op in terms of functionality but,
because it inlines the mapper itself, I'm hoping that there may
be some modest perf improvements.
Metric Decrease:
T5631
T5642
T3064
T9020
T14683
hie002
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5800ebfeb2fe3e3ed985cdf08a66defea73db71d">5800ebfe</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-17T07:38:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't update ModDetails with CafInfos when opts are disabled
This is consistent with the interface file behavior where we omit
HsNoCafRefs annotations with -fomit-interface-pragmas (implied by -O0).
ModDetails and ModIface are just different representations of the same
thing, so they really need to be in sync. This patch does the right
thing and does not need too much explanation, but here's an example of a
problem not doing this causes in !2842:
-- MyInteger.hs
module MyInteger
( MyInteger (MyInteger)
, ToMyInteger (toMyInteger)
) where
newtype MyInteger = MyInteger Integer
class ToMyInteger a where
toMyInteger :: a -> MyInteger
instance ToMyInteger Integer where
toMyInteger = MyInteger {- . succ -}
-- Main.hs
module Main
( main
) where
import MyInteger (MyInteger (MyInteger), toMyInteger)
main :: IO ()
main = do
let (MyInteger i) = (id . toMyInteger) (41 :: Integer)
print i
If I build this with -O0, without this fix, we generate a ModDetails with
accurate LFInfo for toMyInteger (MyInteger.$fToMyIntegerInteger) which says that
it's a LFReEntrant with arity 1. This means in the use site (Main) we tag the
value:
R3 = MyInteger.$fToMyIntegerInteger_closure + 1;
R2 = GHC.Base.id_closure;
R1 = GHC.Base.._closure;
Sp = Sp - 16;
call stg_ap_ppp_fast(R4, R3, R2, R1) args: 24, res: 0, upd: 24;
Now we change the definition by uncommenting the `succ` part and it becomes a thunk:
MyInteger.$fToMyIntegerInteger [InlPrag=INLINE (sat-args=0)]
:: MyInteger.ToMyInteger GHC.Integer.Type.Integer
[GblId[DFunId(nt)]] =
{} \u [] $ctoMyInteger_rEA;
and its LFInfo is now LFThunk. This change in LFInfo makes a difference in the
use site: we can no longer tag it.
But becuase the interface fingerprint does not change (because ModIface does not
change) we don't rebuild Main and tag the thunk.
(1.2% increase in allocations when building T12545 on armv7 because we
generate more code without CafInfos)
Metric Increase:
T12545
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b632dad2e1d373606fe29f7eee0daf15641560f">5b632dad</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add example for Data.Semigroup.diff
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d85d68b004a3d577c0e27d9e6fdddd118e8a9f3">4d85d68b</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75168d07c9c30289709423fc184bbab8dcad0f4e">75168d07</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make example collapsible
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53ff2cd0c49735e8f709ac8a5ceab68483eb89df">53ff2cd0</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-17T13:46:57+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17021 by checking more return kinds
All the details are in new Note [Datatype return kinds] in
TcTyClsDecls.
Test case: typecheck/should_fail/T17021{,b}
typecheck/should_compile/T17021a
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/528df8ecb4e2f9c78b1ae4ab7ff8230644e9b643">528df8ec</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-18T10:06:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core operations (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e8a71c1138b587dfbab8a1823b3f7fa6f0166bd">4e8a71c1</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-18T10:07:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add release note about fix to #16502.
We thought we needed to update the manual, but the fix for #16502
actually brings the implementation in line with the manual. So we
just alert users of how to update their code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5cbf9934c59f7726781cc4cccf4748a5c09c4997">5cbf9934</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-19T00:39:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update "GHC differences to the FFI Chapter" in user guide.
The old entry had a heavy focus on how things had been. Which is
not what I generally look for in a user guide.
I also added a small section on behaviour of nested safe ffi calls.
[skip-ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b03fd3bcd4ff14aed2942275c3b0db5392dc913c">b03fd3bc</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-03-19T00:40:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Use ConLikeSet to model negative info
In #17911, Simon recognised many warnings stemming from over-long list
unions while coverage checking Cabal's `LicenseId` module.
This patch introduces a new `PmAltConSet` type which uses a `UniqDSet`
instead of an association list for `ConLike`s. For `PmLit`s, it will
still use an assocation list, though, because a similar map data
structure would entail a lot of busy work.
Fixes #17911.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64f207566931469648e791df4f0f0384d45cddd0">64f20756</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-19T12:16:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring: use Platform instead of DynFlags when possible
Metric Decrease:
ManyConstructors
T12707
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb1785d9f839e34a3a4892f354f0c51cc6553c0e">cb1785d9</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-19T12:16:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FastString: fix eager reading of string ptr in hashStr
This read causes NULL dereferencing when len is 0.
Fixes #17909
In the reproducer in #17909 this bug is triggered as follows:
- SimplOpt.dealWithStringLiteral is called with a single-char string
("=" in #17909)
- tailFS gets called on the FastString of the single-char string.
- tailFS checks the length of the string, which is 1, and calls
mkFastStringByteString on the tail of the ByteString, which is an
empty ByteString as the original ByteString has only one char.
- ByteString's unsafeUseAsCStringLen returns (NULL, 0) for the empty
ByteString, which is passed to mkFastStringWith.
- mkFastStringWith gets hash of the NULL pointer via hashStr, which
fails on empty strings because of this bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73a7383ebc17f495d7acd04007c8c56b46532cb6">73a7383e</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-20T20:42:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify treatment of heterogeneous equality
Previously, if we had a [W] (a :: k1) ~ (rhs :: k2), we would
spit out a [D] k1 ~ k2 and part the W as irreducible, hoping for
a unification. But we needn't do this. Instead, we now spit out
a [W] co :: k2 ~ k1 and then use co to cast the rhs of the original
Wanted. This means that we retain the connection between the
spat-out constraint and the original.
The problem with this new approach is that we cannot use the
casted equality for substitution; it's too like wanteds-rewriting-
wanteds. So, we forbid CTyEqCans that mention coercion holes.
All the details are in Note [Equalities with incompatible kinds]
in TcCanonical.
There are a few knock-on effects, documented where they occur.
While debugging an error in this patch, Simon and I ran into
infelicities in how patterns and matches are printed; we made
small improvements.
This patch includes mitigations for #17828, which causes spurious
pattern-match warnings. When #17828 is fixed, these lines should
be removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/faa36e5b3674a7b2cfc6b931eec27b3558fad33b">faa36e5b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-20T20:43:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: ignore in-tree GMP objects with ``--lint``
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a96ff6b1c19c9d0af9c9a39fb2c086f311c7239">9a96ff6b</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-20T20:44:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update core spec to reflect changes to Core.
Key changes:
* Adds a new rule for forall-coercions over coercion variables, which
was implemented but conspicuously missing from the spec.
* Adds treatment for FunCo.
* Adds treatment for ForAllTy over coercion variables.
* Improves commentary (including restoring a Note lost in
03d4852658e1b7407abb4da84b1b03bfa6f6db3b) in the source.
No changes to running code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e0451c6ce78b08b5f7564aa03a9a86051b35163">7e0451c6</a></strong>
<div>
<span>by Sergej Jaskiewicz</span>
<i>at 2020-03-20T20:44:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix event message in withTiming'
This typo caused generating 'end' events without the corresponding 'begin' events.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1542a626a3649e5fc1becec1eff2715a6108d144">1542a626</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fs.h: Add missing declarations on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bcf2ccdd0bdd3cf176943ddb946e4fcef2ac7c1">3bcf2ccd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Avoids redundant case alternative warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b363ef9405c52369b63fc167ded8a533c6a5079">3b363ef9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Normalize slashes in ghc-api annotations output
Enable `normalise_slashes` on `annotations`, `listcomps`, and
`parseTree` to fix Windows failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25fc94295c68620c6928751aaadc46b11a185f0c">25fc9429</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update expected output on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f58ec6d94f49cf5713757710c6b80a682ee066b">7f58ec6d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix TOP of T17786
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aadcd909563d5ddf7b2fc469ee3c09c301b1a813">aadcd909</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update expected output on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc1eb10dae03f3fe5f11de845c6772c229684c28">dc1eb10d</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix executable extension passed to testsuite driver
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58f62e2caa19e13082807da1d49f94e9cf869322">58f62e2c</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Require that Windows-hadrian job passes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dd2415dd2f423688f33a8fb267857e3ff39754d">8dd2415d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Eliminate redundant .exe from GHC path
Previously we were invoking:
bash -c
"c:/GitLabRunner/builds/eEQrxK4p/0/ghc/ghc/toolchain/bin/ghc.exe.exe
testsuite/mk/ghc-config.hs -o _build/test/bin/ghc-config.exe"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/373621f61f812accdeba39c745eb7d015430ff8e">373621f6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abc02b4036c2d8efe50b720d8c8103c4f1b8899a">abc02b40</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-03-22T22:38:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Annotate the non-total function in Data.Foldable as such
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19f125578247dfe8036b5793cb3f6b684474f9c7">19f12557</a></strong>
<div>
<span>by Josef Svenningsson</span>
<i>at 2020-03-23T14:05:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix ApplicativeDo regression #17835
A previous fix for #15344 made sure that monadic 'fail' is used properly
when translating ApplicativeDo. However, it didn't properly account
for when a 'fail' will be inserted which resulted in some programs
failing with a type error.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2643ba465cd2a133b6f495f34fc59cd1a6d23525">2643ba46</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-24T08:31:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add example and doc for Arg (Fixes #17153)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/703221f408b023a1b3433938572e7b5c24b4af60">703221f4</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-03-25T14:45:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use export list of Main module in function TcRnDriver.hs:check_main (Fix #16453)
- Provide the export list of the `Main` module as parameter to the
`compiler/typecheck/TcRnDriver.hs:check_main` function.
- Instead of `lookupOccRn_maybe` call the function `lookupInfoOccRn`.
It returns the list `mains_all` of all the main functions in scope.
- Select from this list `mains_all` all `main` functions that are in
the export list of the `Main` module.
- If this new list contains exactly one single `main` function, then
typechecking continues.
- Otherwise issue an appropriate error message.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e27205a66b06a4501d87eb31e285eadbc693eb7">3e27205a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-03-25T14:45:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove -fkill-absence and -fkill-one-shot flags
They seem to be a benchmarking vestige of the Cardinality paper and
probably shouldn't have been merged to HEAD in the first place.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/262e42aa34c4d5705c8d011907c351497dd4e862">262e42aa</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-03-25T22:41:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not panic on linker errors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0de03cd78729dc58a846c64b645e71057ec5d24e">0de03cd7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-25T22:42:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags refactoring III
Use Platform instead of DynFlags when possible:
* `tARGET_MIN_INT` et al. replaced with `platformMinInt` et al.
* no more DynFlags in PreRules: added a new `RuleOpts` datatype
* don't use `wORD_SIZE` in the compiler
* make `wordAlignment` use `Platform`
* make `dOUBLE_SIZE` a constant
Metric Decrease:
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a04920b23376b2759b5049820400ddd40f7b89e">7a04920b</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: fix a typo in liftA doc
This change removes an extra '|' that should not be rendered in
the liftA documentation.
Tracking: #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c5a15f7d257d0a2ded4850e38b6174965a7735b">1c5a15f7</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: add Control.Applicative optional example
This change adds an optional example.
Tracking: #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d172e63f3dd3590b0a57371efb8f924f1fcdf05">6d172e63</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: add markup around Except
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb2162c81964b3a1057c21c73574cc2b542d863a">eb2162c8</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-03-26T12:37:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused `ghciTablesNextToCode` from compiler proper
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f51efc4bf5f20d1df3d11a2bb4c147f416367ae4">f51efc4b</a></strong>
<div>
<span>by Joachim Breitner</span>
<i>at 2020-03-26T12:37:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Prepare to use run-time tablesNextToCode in compiler exclusively
Factor out CPP as much as possible to prepare for runtime
determinattion.
Progress towards #15548
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c446220250dcada51d4bb33a0cc7d8ce572e8b6">1c446220</a></strong>
<div>
<span>by Joachim Breitner</span>
<i>at 2020-03-26T12:37:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use run-time tablesNextToCode in compiler exclusively (#15548)
Summary:
- There is no more use of the TABLES_NEXT_TO_CODE CPP macro in
`compiler/`. GHCI_TABLES_NEXT_TO_CODE is also removed entirely.
The field within `PlatformMisc` within `DynFlags` is used instead.
- The field is still not exposed as a CLI flag. We might consider some
way to ensure the right RTS / libraries are used before doing that.
Original reviewers:
Original subscribers: TerrorJack, rwbarton, carter
Original Differential Revision: https://phabricator.haskell.org/D5082
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1941ef4f050c0dfcb68229641fcbbde3a10f1072">1941ef4f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Types (#13009)
Update Haddock submodule
Metric Increase:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c7c6f1afc8e7f7ba5d256780bc9d5bb5f3e7601">1c7c6f1a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GHC.Types.Unique.Map module
This module isn't used anywhere in GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1a6c73d01912b389e012a0af81a5c2002e82636">f1a6c73d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge GHC.Types.CostCentre.Init into GHC.Driver.CodeOutput
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54250f2d8de910b094070c1b48f086030df634b1">54250f2d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-29T17:29:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Demand analysis: simplify the demand for a RHS
Ticket #17932 showed that we were using a stupid demand for the RHS
of a let-binding, when the result is a product. This was the result
of a "fix" in 2013, which (happily) turns out to no longer be
necessary.
So I just deleted the code, which simplifies the demand analyser,
and fixes #17932. That in turn uncovered that the anticipation
of worker/wrapper in CPR analysis was inaccurate, hence the logic
that decides whether to unbox an argument in WW was extracted into
a function `wantToUnbox`, now consulted by CPR analysis.
I tried nofib, and got 0.0% perf changes.
All this came up when messing about with !2873 (ticket #17917),
but is idependent of it.
Unfortunately, this patch regresses #4267 and realised that it is now
blocked on #16335.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/03060b2f963436dd22582f3a1c218b7a74d302ec">03060b2f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix T17786 on Windows
Fixes line ending normalization issue.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f7995baaaf4dcba9b3abaddcd571ac66675ab19">1f7995ba</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix T17786
Fix missing quoting and expected exit code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef9c608eba417c59fe45c9edd6a946c59f50b5d2">ef9c608e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T12971 as broken on Windows
Due to #17945.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e54500c12de051cb9695728d27c812e5160593ee">e54500c1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:30:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Store ComponentId details
As far as GHC is concerned, installed package components ("units") are
identified by an opaque ComponentId string provided by Cabal. But we
don't want to display it to users (as it contains a hash) so GHC queries
the database to retrieve some infos about the original source package
(name, version, component name).
This patch caches these infos in the ComponentId itself so that we don't
need to provide DynFlags (which contains installed package informations)
to print a ComponentId.
In the future we want GHC to support several independent package states
(e.g. for plugins and for target code), hence we need to avoid
implicitly querying a single global package state.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e7cb714173652165b8372c3450f4ccd6a377497">7e7cb714</a></strong>
<div>
<span>by Marius Bakke</span>
<i>at 2020-03-29T17:31:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Remove test that dlopens a PIE object.
glibc 2.30 disallowed dlopening PIE objects, so just remove the test.
Fixes #17952.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c8f80d8876965539571d37d3c7f0fee43c300d2">6c8f80d8</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-29T17:32:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correct haddocks for testBit in Data.Bits
It conflated the nth bit with the bit at offset n.
Now we instead give the definition in terms of `bit and `.&.`
on top of clearer phrasing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c916f190b455d9c43459f81c7ee06d06ab3db957">c916f190</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-29T17:32:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/Data/Bits.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64bf7f51064dad9c63728ac8bccdb9cf00bdb420">64bf7f51</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:32:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add FreeBSD release job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0d8e92e9c9b67426aa139d6bc46363d8940f992">a0d8e92e</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-29T17:33:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Run checkNewDataCon before constraint-solving newtype constructors
Within `checkValidDataCon`, we used to run `checkValidType` on the
argument types of a newtype constructor before running
`checkNewDataCon`, which ensures that the user does not attempt
non-sensical things such as newtypes with multiple arguments or
constraints. This works out in most situations, but this falls over
on a corner case revealed in #17955:
```hs
newtype T = Coercible () T => T ()
```
`checkValidType`, among other things, peforms an ambiguity check on
the context of a data constructor, and that it turn invokes the
constraint solver. It turns out that there is a special case in the
constraint solver for representational equalities (read: `Coercible`
constraints) that causes newtypes to be unwrapped (see
`Note [Unwrap newtypes first]` in `TcCanonical`). This special case
does not know how to cope with an ill formed newtype like `T`, so
it ends up panicking.
The solution is surprisingly simple: just invoke `checkNewDataCon`
before `checkValidType` to ensure that the illicit newtype
constructor context is detected before the constraint solver can
run amok with it.
Fixes #17955.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/45eb9d8cad254440eaea25676d6788ca13baa2fb">45eb9d8c</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-29T17:33:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor cleanup
- Simplify mkBuildExpr, the function newTyVars was called
only on a one-element list.
- TTG: use noExtCon in more places. This is more future-proof.
- In zonkExpr, panic instead of printing a warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f024b6e385bd1448968b7bf20de05f655c815bae">f024b6e3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-30T12:48:39+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expect T4267 to pass
Since 54250f2d8de910b094070c1b48f086030df634b1 we expected T4267 to
fail, but it passes on CI.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57b888c0e90be7189285a6b078c30b26d0923809">57b888c0</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-31T10:54:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Require GHC 8.8 as the minimum compiler for bootstrapping
This allows us to remove several bits of CPP that are either always
true or no longer reachable. As an added bonus, we no longer need to
worry about importing `Control.Monad.Fail.fail` qualified to avoid
clashing with `Control.Monad.fail`, since the latter is now the same
as the former.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33f095511a8fce4c945bbcd4feb3910c854dcb61">33f09551</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-31T10:54:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #17963
The panic in #17963 happened to be fixed by commit
e3c374cc5bd7eb49649b9f507f9f7740697e3f70. This patch adds a
regression test to ensure that it remains fixed.
Fixes #17963.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09a36e80ecaefcfb60eccda98bd06461d0aeca70">09a36e80</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-31T10:55:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify stderrSupportsAnsiColors
The combinator andM is used only once, and the code is shorter and
simpler if you inline it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95bccdd034ce4dd2d1bc36db9f1ba5e172550249">95bccdd0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-31T10:56:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Ensure that encoding global variables aren't inlined
As noted in #17970, these (e.g. `getFileSystemEncoding` and
`setFileSystemEncoding`) previously had unfoldings, which would
break their global-ness.
While not strictly necessary, I also add a NOINLINE on
`initLocaleEncoding` since it is used in `System.IO`, ensuring that we
only system's query the locale encoding once.
Fixes #17970.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/982aaa837aed564ae9b418cda8e97d4facff8fb8">982aaa83</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-31T10:56:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update hadrian index revision.
Required in order to build hadrian using ghc-8.10
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b9c586472bf99425f7bbcf346472d7c54f05028">4b9c5864</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-31T10:57:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">integer-gmp: Bump version and add changelog entry
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b39f2e6f63ae50cedd96eaf49146de8ed00fbc8">9b39f2e6</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-01T01:20:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up "Eta reduction for data families" Notes
Before, there were two distinct Notes named
"Eta reduction for data families". This renames one of them to
"Implementing eta reduction for data families" to disambiguate the
two and fixes references in other parts of the codebase to ensure
that they are pointing to the right place.
Fixes #17313.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7627eab5dd882eb6f1567e3ae95c6c770830a5eb">7627eab5</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-01T01:20:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the changelog/@since information for hGetContents'/getContents'/readFile'
Fixes #17979.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0002db1bf436cbd32f97b659a52b1eee4e8b21db">0002db1b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-01T01:21:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Kill wORDS_BIGENDIAN and replace it with platformByteOrder (#17957)
Metric Decrease:
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613">7b217179</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-01T15:03:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Adjust recursion depth for inhabitation test
In #17977, we ran into the reduction depth limit of the typechecker.
That was only a symptom of a much broader issue: The recursion depth
of the coverage checker for trying to instantiate strict fields in the
`nonVoid` test was far too high (100, the `defaultMaxTcBound`).
As a result, we were performing quite poorly on `T17977`.
Short of a proper termination analysis to prove emptyness of a type,
we just arbitrarily default to a much lower recursion limit of 3.
Fixes #17977.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c09f636a459f50119bfbb5bf798b9a9e19eb464">3c09f636</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-01T15:03:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make hadrian pass on the no-colour setting to GHC.
Fixes #17983.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b943b25d0786da64031ac63ddf9b4574182057bb">b943b25d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-02T01:45:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-engineer the binder-swap transformation
The binder-swap transformation is implemented by the occurrence
analyser -- see Note [Binder swap] in OccurAnal. However it had
a very nasty corner in it, for the case where the case scrutinee
was a GlobalId. This led to trouble and hacks, and ultimately
to #16296.
This patch re-engineers how the occurrence analyser implements
the binder-swap, by actually carrying out a substitution rather
than by adding a let-binding. It's all described in
Note [The binder-swap substitution].
I did a few other things along the way
* Fix a bug in StgCse, which could allow a loop breaker to be CSE'd
away. See Note [Care with loop breakers] in StgCse. I think it can
only show up if occurrence analyser sets up bad loop breakers, but
still.
* Better commenting in SimplUtils.prepareAlts
* A little refactoring in CoreUnfold; nothing significant
e.g. rename CoreUnfold.mkTopUnfolding to mkFinalUnfolding
* Renamed CoreSyn.isFragileUnfolding to hasCoreUnfolding
* Move mkRuleInfo to CoreFVs
We observed respectively 4.6% and 5.9% allocation decreases for the following
tests:
Metric Decrease:
T9961
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42d68364f66846969edf029f878875c10cdfe0b2">42d68364</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-02T01:46:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Preserve precise exceptions in strictness analysis
Fix #13380 and #17676 by
1. Changing `raiseIO#` to have `topDiv` instead of `botDiv`
2. Give it special treatment in `Simplifier.Util.mkArgInfo`, treating it
as if it still had `botDiv`, to recover dead code elimination.
This is the first commit of the plan outlined in
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/2525#note_260886.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a88dd11594b8d8fd20500d026e657a5f99dfdd2">0a88dd11</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-02T01:47:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a pointer format string in RTS
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5beac042b995b055a66bc16be536d9e920f6864d">5beac042</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-02T01:48:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused closure stg_IND_direct
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88f38b03025386f0f1e8f5861eed67d80495168a">88f38b03</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-02T01:48:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Session: Memoize stderrSupportsAnsiColors
Not only is this a reasonable efficiency measure but it avoids making
reentrant calls into ncurses, which is not thread-safe. See #17922.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27740f24cb70fc14b00c1212c06642a144a6117d">27740f24</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-02T01:49:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Hadrian build with Cabal-3.2
GHC 8.10 ships with `Cabal-3.2.0.0`, so it would be convenient to
make Hadrian supporting building against 3.2.* instead of having to
rebuild the entirety of `Cabal-3.0.0.0`. There is one API change in
`Cabal-3.2.*` that affects Hadrian: the `synopsis` and `description`
functions now return `ShortText` instead of `String`. Since Hadrian
manipulates these `String`s in various places, I found that the
simplest fix was to use CPP to convert `ShortText` to `String`s
where appropriate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4980200255dabf59ae537f10c55d19ef1a00bbdd">49802002</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-02T01:50:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Stack resolver for hadrian/build-stack
Broken by 57b888c0e90be7189285a6b078c30b26d0923809
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30a63e79c65b023497af4fe2347149382c71829d">30a63e79</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-02T01:50:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two ASSERT buglets in reifyDataCon
Two `ASSERT`s in `reifyDataCon` were always using `arg_tys`, but
`arg_tys` is not meaningful for GADT constructors. In fact, it's
worse than non-meaningful, since using `arg_tys` when reifying a
GADT constructor can lead to failed `ASSERT`ions, as #17305
demonstrates.
This patch applies the simplest possible fix to the immediate
problem. The `ASSERT`s now use `r_arg_tys` instead of `arg_tys`, as
the former makes sure to give something meaningful for GADT
constructors. This makes the panic go away at the very least. There
is still an underlying issue with the way the internals of
`reifyDataCon` work, as described in
https://gitlab.haskell.org/ghc/ghc/issues/17305#note_227023, but we
leave that as future work, since fixing the underlying issue is
much trickier (see
https://gitlab.haskell.org/ghc/ghc/issues/17305#note_227087).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef7576c40f8de391ed8b1c81c38156202e6d17cf">ef7576c4</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-04-03T06:24:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add outputable instances for the types in GHC.Iface.Ext.Types, add -ddump-hie
flag to dump pretty printed contents of the .hie file
Metric Increase:
hie002
Because of the regression on i386:
compile_time/bytes allocated increased from i386-linux-deb9 baseline @ HEAD~10:
Expected hie002 (normal) compile_time/bytes allocated: 583014888.0 +/-10%
Lower bound hie002 (normal) compile_time/bytes allocated: 524713399
Upper bound hie002 (normal) compile_time/bytes allocated: 641316377
Actual hie002 (normal) compile_time/bytes allocated: 877986292
Deviation hie002 (normal) compile_time/bytes allocated: 50.6 %
*** unexpected stat test failure for hie002(normal)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9462452a4843a2c42fe055a0a7e274d5164d1dc0">9462452a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-03T06:25:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve and refactor StgToCmm codegen for DataCons.
We now differentiate three cases of constructor bindings:
1)Bindings which we can "replace" with a reference to
an existing closure. Reference the replacement closure
when accessing the binding.
2)Bindings which we can "replace" as above. But we still
generate a closure which will be referenced by modules
importing this binding.
3)For any other binding generate a closure. Then reference
it.
Before this patch 1) did only apply to local bindings and we
didn't do 2) at all.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a214d2142c1bafa71fe52cb3823351ff9322d336">a214d214</a></strong>
<div>
<span>by Moritz Bruder</span>
<i>at 2020-04-03T06:26:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add singleton to NonEmpty in libraries/base
This adds a definition to construct a singleton non-empty list
(Data.List.NonEmpty) according to issue #17851.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7597aa0c028ced898ac97e344754dd961b70c57">f7597aa0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: measure compiler stats for T16190
We were mistakenly measuring program stats
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a485c3c4049fff09e989bfd7d2ba47035c92a69b">a485c3c4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move blob handling into StgToCmm
Move handling of big literal strings from CmmToAsm to StgToCmm. It
avoids the use of `sdocWithDynFlags` (cf #10143). We might need to move
this handling even higher in the pipeline in the future (cf #17960):
this patch will make it easier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc2918a0407e1581e824ebd90a1fcbb0637d5744">cc2918a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CmmStatics
In !2959 we noticed that there was some redundant code (in GHC.Cmm.Utils
and GHC.Cmm.StgToCmm.Utils) used to deal with `CmmStatics` datatype
(before SRT generation) and `RawCmmStatics` datatype (after SRT
generation).
This patch removes this redundant code by using a single GADT for
(Raw)CmmStatics.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e60273db47364fc08aeb5a389caf67559e0d353">9e60273d</a></strong>
<div>
<span>by Maxim Koltsov</span>
<i>at 2020-04-03T06:27:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix haddock formatting in Control.Monad.ST.Lazy.Imp.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b7e8a94cb3334fc0e513dec2db323f32c3a0713">1b7e8a94</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-03T06:28:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Turn newlines into spaces for hadrian/ghci.
The newlines break the command on windows.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4291bddaea3148908c55f235ee8978e1d9aa6f20">4291bdda</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-03T06:28:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Major improvements to the specialiser
This patch is joint work of Alexis King and Simon PJ. It does some
significant refactoring of the type-class specialiser. Main highlights:
* We can specialise functions with types like
f :: Eq a => a -> Ord b => b => blah
where the classes aren't all at the front (#16473). Here we can
correctly specialise 'f' based on a call like
f @Int @Bool dEqInt x dOrdBool
This change really happened in an earlier patch
commit 2d0cf6252957b8980d89481ecd0b79891da4b14b
Author: Sandy Maguire <sandy@sandymaguire.me>
Date: Thu May 16 12:12:10 2019 -0400
work that this new patch builds directly on that work, and refactors
it a bit.
* We can specialise functions with implicit parameters (#17930)
g :: (?foo :: Bool, Show a) => a -> String
Previously we could not, but now they behave just like a non-class
argument as in 'f' above.
* We can specialise under-saturated calls, where some (but not all of
the dictionary arguments are provided (#17966). For example, we can
specialise the above 'f' based on a call
map (f @Int dEqInt) xs
even though we don't (and can't) give Ord dictionary.
This may sound exotic, but #17966 is a program from the wild, and
showed significant perf loss for functions like f, if you need
saturation of all dictionaries.
* We fix a buglet in which a floated dictionary had a bogus demand
(#17810), by using zapIdDemandInfo in the NonRec case of specBind.
* A tiny side benefit: we can drop dead arguments to specialised
functions; see Note [Drop dead args from specialisations]
* Fixed a bug in deciding what dictionaries are "interesting"; see
Note [Keep the old dictionaries interesting]
This is all achieved by by building on Sandy Macguire's work in
defining SpecArg, which mkCallUDs uses to describe the arguments of
the call. Main changes:
* Main work is in specHeader, which marched down the [InBndr] from the
function definition and the [SpecArg] from the call site, together.
* specCalls no longer has an arity check; the entire mechanism now
handles unders-saturated calls fine.
* mkCallUDs decides on an argument-by-argument basis whether to
specialise a particular dictionary argument; this is new.
See mk_spec_arg in mkCallUDs.
It looks as if there are many more lines of code, but I think that
all the extra lines are comments!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40a85563a46c682eaab5fdf970f7c46afca78cb3">40a85563</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-03T18:26:19+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert accidental change in 9462452
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd75e5da0f1f05f107325733b570bf28b379d2f2">bd75e5da</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-04T07:07:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable ImpredicativeTypes internally when typechecking selector bindings
This is necessary for certain record selectors with higher-rank
types, such as the examples in #18005. See
`Note [Impredicative record selectors]` in `TcTyDecls`.
Fixes #18005.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcfe29c8520244764146c7a5f336be1f9700db6c">dcfe29c8</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-06T13:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't override proc CafInfos in ticky builds
Fixes #17947
When we have a ticky label for a proc, IdLabels for the ticky counter
and proc entry share the same Name. This caused overriding proc CafInfos
with the ticky CafInfos (i.e. NoCafRefs) during SRT analysis.
We now ignore the ticky labels when building SRTMaps. This makes sense
because:
- When building the current module they don't need to be in SRTMaps as
they're initialized as non-CAFFY (see mkRednCountsLabel), so they
don't take part in the dependency analysis and they're never added to
SRTs.
(Reminder: a "dependency" in the SRT analysis is a CAFFY dependency,
non-CAFFY uses are not considered as dependencies for the algorithm)
- They don't appear in the interfaces as they're not exported, so it
doesn't matter for cross-module concerns whether they're in the SRTMap
or not.
See also the new Note [Ticky labels in SRT analysis].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cec2c71fe91c88649628c6e83416533b816b86a5">cec2c71f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-06T13:16:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix an tricky specialiser loop
Issue #17151 was a very tricky example of a bug in which the
specialiser accidentally constructs a recurive dictionary,
so that everything turns into bottom.
I have fixed variants of this bug at least twice before:
see Note [Avoiding loops]. It was a bit of a struggle
to isolate the problem, greatly aided by the work that
Alexey Kuleshevich did in distilling a test case.
Once I'd understood the problem, it was not difficult to fix,
though it did lead me a bit of refactoring in specImports.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e850d14ffbeea39ad386b1e888cd97375758d6d6">e850d14f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-06T13:16:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring only
This refactors DictBinds into a data type rather than a pair.
No change in behaviour, just better code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f38e8d61f066c3064c600c352eebcd87f28d989a">f38e8d61</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-07T02:00:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: ProfHeap: Fix memory leak when not compiled with profiling
If we're doing heap profiling on an unprofiled executable we keep
allocating new space in initEra via nextEra on each profiler run but we
don't have a corresponding freeEra call.
We do free the last era in endHeapProfiling but previous eras will have
been overwritten by initEra and will never get free()ed.
Metric Decrease:
space_leak_001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcd668593e1c9e00c5d9c72960b4833dd526cb9a">bcd66859</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-07T02:00:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-export GHC.Magic.noinline from base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d2991f8b4c1b686323b2c9452ce845a60b8d94c">3d2991f8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-07T18:36:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">simplifier: Kill off ufKeenessFactor
We used to have another factor, ufKeenessFactor, which would scale the
discounts before they were subtracted from the size. This was justified
with the following comment:
-- We multiple the raw discounts (args_discount and result_discount)
-- ty opt_UnfoldingKeenessFactor because the former have to do with
-- *size* whereas the discounts imply that there's some extra
-- *efficiency* to be gained (e.g. beta reductions, case reductions)
-- by inlining.
However, this is highly suspect since it means that we subtract a
*scaled* size from an absolute size, resulting in crazy (e.g. negative)
scores in some cases (#15304). We consequently killed off
ufKeenessFactor and bumped up the ufUseThreshold to compensate.
Adjustment of unfolding use threshold
=====================================
Since this removes a discount from our inlining heuristic, I revisited our
default choice of -funfolding-use-threshold to minimize the change in
overall inlining behavior. Specifically, I measured runtime allocations
and executable size of nofib and the testsuite performance tests built
using compilers (and core libraries) built with several values of
-funfolding-use-threshold.
This comes as a result of a quantitative comparison of testsuite
performance and code size as a function of ufUseThreshold, comparing
GHC trees using values of 50, 60, 70, 80, 90, and 100. The test set
consisted of nofib and the testsuite performance tests.
A full summary of these measurements are found in the description of
!2608
Comparing executable sizes (relative to the base commit) across all
nofib tests, we see that sizes are similar to the baseline:
gmean min max median
thresh
50 -6.36% -7.04% -4.82% -6.46%
60 -5.04% -5.97% -3.83% -5.11%
70 -2.90% -3.84% -2.31% -2.92%
80 -0.75% -2.16% -0.42% -0.73%
90 +0.24% -0.41% +0.55% +0.26%
100 +1.36% +0.80% +1.64% +1.37%
baseline +0.00% +0.00% +0.00% +0.00%
Likewise, looking at runtime allocations we see that 80 gives slightly
better optimisation than the baseline:
gmean min max median
thresh
50 +0.16% -0.16% +4.43% +0.00%
60 +0.09% -0.00% +3.10% +0.00%
70 +0.04% -0.09% +2.29% +0.00%
80 +0.02% -1.17% +2.29% +0.00%
90 -0.02% -2.59% +1.86% +0.00%
100 +0.00% -2.59% +7.51% -0.00%
baseline +0.00% +0.00% +0.00% +0.00%
Finally, I had to add a NOINLINE in T4306 to ensure that `upd` is
worker-wrappered as the test expects. This makes me wonder whether the
inlining heuristic is now too liberal as `upd` is quite a large
function. The same measure was taken in T12600.
Wall clock time compiling Cabal with -O0
thresh 50 60 70 80 90 100 baseline
build-Cabal 93.88 89.58 92.59 90.09 100.26 94.81 89.13
Also, this change happens to avoid the spurious test output in
`plugin-recomp-change` and `plugin-recomp-change-prof` (see #17308).
Metric Decrease:
hie002
T12234
T13035
T13719
T14683
T4801
T5631
T5642
T9020
T9872d
T9961
Metric Increase:
T12150
T12425
T13701
T14697
T15426
T1969
T3064
T5837
T6048
T9203
T9872a
T9872b
T9872c
T9872d
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/255418da5d264fb2758bc70925adb2094f34adc3">255418da</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-07T18:36:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: type-checker (#13009)
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04b6cf947ea065a210a216cc91f918cc1660d430">04b6cf94</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-07T19:43:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make NoExtCon fields strict
This changes every unused TTG extension constructor to be strict in
its field so that the pattern-match coverage checker is smart enough
any such constructors are unreachable in pattern matches. This lets
us remove nearly every use of `noExtCon` in the GHC API. The only
ones we cannot remove are ones underneath uses of `ghcPass`, but that
is only because GHC 8.8's and 8.10's coverage checkers weren't smart
enough to perform this kind of reasoning. GHC HEAD's coverage
checker, on the other hand, _is_ smart enough, so we guard these uses
of `noExtCon` with CPP for now.
Bumps the `haddock` submodule.
Fixes #17992.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7802fa17a9a1a0f02fbf95170c13d7a9711a681e">7802fa17</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-08T16:43:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle promoted data constructors in typeToLHsType correctly
Instead of using `nlHsTyVar`, which hardcodes `NotPromoted`, have
`typeToLHsType` pick between `Promoted` and `NotPromoted` by checking
if a type constructor is promoted using `isPromotedDataCon`.
Fixes #18020.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce481361fc95405cfadcd8f930629381e80e7f84">ce481361</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-09T16:17:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Use --export-dynamic when linking iserv
As noticed in #17962, the make build system currently does this (see
3ce0e0ba) but the change was never ported to Hadrian.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa66f143a61f2285618c611a27c23815ca588299">fa66f143</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-09T16:17:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">iserv: Don't pass --export-dynamic on FreeBSD
This is definitely a hack but it's probably the best we can do for now.
Hadrian does the right thing here by passing --export-dynamic only to
the linker.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/390751768104cd3d2cb57e2037062916476ebd10">39075176</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-09T16:18:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix CNF handling in compacting GC
Fixes #17937
Previously compacting GC simply ignored CNFs. This is mostly fine as
most (see "What about small compacts?" below) CNF objects don't have
outgoing pointers, and are "large" (allocated in large blocks) and large
objects are not moved or compacted.
However if we do GC *during* sharing-preserving compaction then the CNF
will have a hash table mapping objects that have been moved to the CNF
to their location in the CNF, to be able to preserve sharing.
This case is handled in the copying collector, in `scavenge_compact`,
where we evacuate hash table entries and then rehash the table.
Compacting GC ignored this case.
We now visit CNFs in all generations when threading pointers to the
compacted heap and thread hash table keys. A visited CNF is added to the
list `nfdata_chain`. After compaction is done, we re-visit the CNFs in
that list and rehash the tables.
The overhead is minimal: the list is static in `Compact.c`, and link
field is added to `StgCompactNFData` closure. Programs that don't use
CNFs should not be affected.
To test this CNF tests are now also run in a new way 'compacting_gc',
which just passes `-c` to the RTS, enabling compacting GC for the oldest
generation. Before this patch the result would be:
Unexpected failures:
compact_gc.run compact_gc [bad exit code (139)] (compacting_gc)
compact_huge_array.run compact_huge_array [bad exit code (1)] (compacting_gc)
With this patch all tests pass. I can also pass `-c -DS` without any
failures.
What about small compacts? Small CNFs are still not handled by the
compacting GC. However so far I'm unable to write a test that triggers a
runtime panic ("update_fwd: unknown/strange object") by allocating a
small CNF in a compated heap. It's possible that I'm missing something
and it's not possible to have a small CNF.
NoFib Results:
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS +0.1% 0.0% 0.0% +0.0% +0.0%
CSD +0.1% 0.0% 0.0% 0.0% 0.0%
FS +0.1% 0.0% 0.0% 0.0% 0.0%
S +0.1% 0.0% 0.0% 0.0% 0.0%
VS +0.1% 0.0% 0.0% 0.0% 0.0%
VSD +0.1% 0.0% +0.0% +0.0% -0.0%
VSM +0.1% 0.0% +0.0% -0.0% 0.0%
anna +0.0% 0.0% -0.0% -0.0% -0.0%
ansi +0.1% 0.0% +0.0% +0.0% +0.0%
atom +0.1% 0.0% +0.0% +0.0% +0.0%
awards +0.1% 0.0% +0.0% +0.0% +0.0%
banner +0.1% 0.0% +0.0% +0.0% +0.0%
bernouilli +0.1% 0.0% 0.0% -0.0% +0.0%
binary-trees +0.1% 0.0% -0.0% -0.0% 0.0%
boyer +0.1% 0.0% +0.0% +0.0% +0.0%
boyer2 +0.1% 0.0% +0.0% +0.0% +0.0%
bspt +0.1% 0.0% -0.0% -0.0% -0.0%
cacheprof +0.1% 0.0% -0.0% -0.0% -0.0%
calendar +0.1% 0.0% +0.0% +0.0% +0.0%
cichelli +0.1% 0.0% +0.0% +0.0% +0.0%
circsim +0.1% 0.0% +0.0% +0.0% +0.0%
clausify +0.1% 0.0% -0.0% +0.0% +0.0%
comp_lab_zift +0.1% 0.0% +0.0% +0.0% +0.0%
compress +0.1% 0.0% +0.0% +0.0% 0.0%
compress2 +0.1% 0.0% -0.0% 0.0% 0.0%
constraints +0.1% 0.0% +0.0% +0.0% +0.0%
cryptarithm1 +0.1% 0.0% +0.0% +0.0% +0.0%
cryptarithm2 +0.1% 0.0% +0.0% +0.0% +0.0%
cse +0.1% 0.0% +0.0% +0.0% +0.0%
digits-of-e1 +0.1% 0.0% +0.0% -0.0% -0.0%
digits-of-e2 +0.1% 0.0% -0.0% -0.0% -0.0%
dom-lt +0.1% 0.0% +0.0% +0.0% +0.0%
eliza +0.1% 0.0% +0.0% +0.0% +0.0%
event +0.1% 0.0% +0.0% +0.0% +0.0%
exact-reals +0.1% 0.0% +0.0% +0.0% +0.0%
exp3_8 +0.1% 0.0% +0.0% -0.0% 0.0%
expert +0.1% 0.0% +0.0% +0.0% +0.0%
fannkuch-redux +0.1% 0.0% -0.0% 0.0% 0.0%
fasta +0.1% 0.0% -0.0% +0.0% +0.0%
fem +0.1% 0.0% -0.0% +0.0% 0.0%
fft +0.1% 0.0% -0.0% +0.0% +0.0%
fft2 +0.1% 0.0% +0.0% +0.0% +0.0%
fibheaps +0.1% 0.0% +0.0% +0.0% +0.0%
fish +0.1% 0.0% +0.0% +0.0% +0.0%
fluid +0.0% 0.0% +0.0% +0.0% +0.0%
fulsom +0.1% 0.0% -0.0% +0.0% 0.0%
gamteb +0.1% 0.0% +0.0% +0.0% 0.0%
gcd +0.1% 0.0% +0.0% +0.0% +0.0%
gen_regexps +0.1% 0.0% -0.0% +0.0% 0.0%
genfft +0.1% 0.0% +0.0% +0.0% +0.0%
gg +0.1% 0.0% 0.0% +0.0% +0.0%
grep +0.1% 0.0% -0.0% +0.0% +0.0%
hidden +0.1% 0.0% +0.0% -0.0% 0.0%
hpg +0.1% 0.0% -0.0% -0.0% -0.0%
ida +0.1% 0.0% +0.0% +0.0% +0.0%
infer +0.1% 0.0% +0.0% 0.0% -0.0%
integer +0.1% 0.0% +0.0% +0.0% +0.0%
integrate +0.1% 0.0% -0.0% -0.0% -0.0%
k-nucleotide +0.1% 0.0% +0.0% +0.0% 0.0%
kahan +0.1% 0.0% +0.0% +0.0% +0.0%
knights +0.1% 0.0% -0.0% -0.0% -0.0%
lambda +0.1% 0.0% +0.0% +0.0% -0.0%
last-piece +0.1% 0.0% +0.0% 0.0% 0.0%
lcss +0.1% 0.0% +0.0% +0.0% 0.0%
life +0.1% 0.0% -0.0% +0.0% +0.0%
lift +0.1% 0.0% +0.0% +0.0% +0.0%
linear +0.1% 0.0% -0.0% +0.0% 0.0%
listcompr +0.1% 0.0% +0.0% +0.0% +0.0%
listcopy +0.1% 0.0% +0.0% +0.0% +0.0%
maillist +0.1% 0.0% +0.0% -0.0% -0.0%
mandel +0.1% 0.0% +0.0% +0.0% 0.0%
mandel2 +0.1% 0.0% +0.0% +0.0% +0.0%
mate +0.1% 0.0% +0.0% 0.0% +0.0%
minimax +0.1% 0.0% -0.0% 0.0% -0.0%
mkhprog +0.1% 0.0% +0.0% +0.0% +0.0%
multiplier +0.1% 0.0% +0.0% 0.0% 0.0%
n-body +0.1% 0.0% +0.0% +0.0% +0.0%
nucleic2 +0.1% 0.0% +0.0% +0.0% +0.0%
para +0.1% 0.0% 0.0% +0.0% +0.0%
paraffins +0.1% 0.0% +0.0% -0.0% 0.0%
parser +0.1% 0.0% -0.0% -0.0% -0.0%
parstof +0.1% 0.0% +0.0% +0.0% +0.0%
pic +0.1% 0.0% -0.0% -0.0% 0.0%
pidigits +0.1% 0.0% +0.0% -0.0% -0.0%
power +0.1% 0.0% +0.0% +0.0% +0.0%
pretty +0.1% 0.0% -0.0% -0.0% -0.1%
primes +0.1% 0.0% -0.0% -0.0% -0.0%
primetest +0.1% 0.0% -0.0% -0.0% -0.0%
prolog +0.1% 0.0% -0.0% -0.0% -0.0%
puzzle +0.1% 0.0% -0.0% -0.0% -0.0%
queens +0.1% 0.0% +0.0% +0.0% +0.0%
reptile +0.1% 0.0% -0.0% -0.0% +0.0%
reverse-complem +0.1% 0.0% +0.0% 0.0% -0.0%
rewrite +0.1% 0.0% -0.0% -0.0% -0.0%
rfib +0.1% 0.0% +0.0% +0.0% +0.0%
rsa +0.1% 0.0% -0.0% +0.0% -0.0%
scc +0.1% 0.0% -0.0% -0.0% -0.1%
sched +0.1% 0.0% +0.0% +0.0% +0.0%
scs +0.1% 0.0% +0.0% +0.0% +0.0%
simple +0.1% 0.0% -0.0% -0.0% -0.0%
solid +0.1% 0.0% +0.0% +0.0% +0.0%
sorting +0.1% 0.0% -0.0% -0.0% -0.0%
spectral-norm +0.1% 0.0% +0.0% +0.0% +0.0%
sphere +0.1% 0.0% -0.0% -0.0% -0.0%
symalg +0.1% 0.0% -0.0% -0.0% -0.0%
tak +0.1% 0.0% +0.0% +0.0% +0.0%
transform +0.1% 0.0% +0.0% +0.0% +0.0%
treejoin +0.1% 0.0% +0.0% -0.0% -0.0%
typecheck +0.1% 0.0% +0.0% +0.0% +0.0%
veritas +0.0% 0.0% +0.0% +0.0% +0.0%
wang +0.1% 0.0% 0.0% +0.0% +0.0%
wave4main +0.1% 0.0% +0.0% +0.0% +0.0%
wheel-sieve1 +0.1% 0.0% +0.0% +0.0% +0.0%
wheel-sieve2 +0.1% 0.0% +0.0% +0.0% +0.0%
x2n1 +0.1% 0.0% +0.0% +0.0% +0.0%
--------------------------------------------------------------------------------
Min +0.0% 0.0% -0.0% -0.0% -0.1%
Max +0.1% 0.0% +0.0% +0.0% +0.0%
Geometric Mean +0.1% -0.0% -0.0% -0.0% -0.0%
Bumping numbers of nonsensical perf tests:
Metric Increase:
T12150
T12234
T12425
T13035
T5837
T6048
It's simply not possible for this patch to increase allocations, and
I've wasted enough time on these test in the past (see #17686). I think
these tests should not be perf tests, but for now I'll bump the numbers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dce50062e35d3246b63fba9357dea6313c23c780">dce50062</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-09T16:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rts: show errno on failure (#18033)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/045139f40089f288866c1c59c7379be82ecdaf34">045139f4</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-04-09T23:10:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add an example to liftIO and explain its purpose
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/101fab6ee6cee72b9ffce40e45ebf39466d1c01a">101fab6e</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-09T23:11:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Special case `isConstraintKindCon` on `AlgTyCon`
Previously, the `tyConUnique` record selector would unfold into a huge
case expression that would be inlined in all call sites, such as the
`INLINE`-annotated `coreView`, see #18026. `constraintKindTyConKey` only
occurs as the `Unique` of an `AlgTyCon` anyway, so we can make the code
a lot more compact, but have to move it to GHC.Core.TyCon.
Metric Decrease:
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f5212dfc10414212e42247c2f2dcc45252f7e1d2">f5212dfc</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-09T23:11:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: No need to attach a StrictSig to DataCon workers
In GHC.Types.Id.Make we were giving a strictness signature to every data
constructor wrapper Id that we weren't looking at in demand analysis
anyway. We used to use its CPR info, but that has its own CPR signature
now.
`Note [Data-con worker strictness]` then felt very out of place, so I
moved it to GHC.Core.DataCon.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75a185dc2a648ab1f592d401daa5efcacb451c83">75a185dc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-09T23:12:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix --summary
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49b4dc92f3f543ac8082b6801718a6387e1ea507">49b4dc92</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-13T11:42:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump FreeBSD bootstrap compiler to 8.10.1
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/714e6dd156f940e5710be4a003b42d58b22cf2bb">714e6dd1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-13T11:47:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Enable FreeBSD job for so-labelled MRs
</pre>
</li>
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