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<h3>
Vladislav Zavialov pushed to branch wip/semigroup-sdoc
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/ffd7eef22f197ba44f0ced97ebc988f2d7d643a4">ffd7eef2</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-04-22T23:09:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">stg-spec: Modify file paths according to new module hierarchy
This patch updates file paths according to new module hierarchy [1]:
* GHC/Stg/Syntax.hs <= stgSyn/StgSyn.hs
* GHC/Types/Literal.hs <= basicTypes/Literal.hs
* GHC/Types/CostCentre.hs <= profiling/CostCentre.hs
This patch also updates old file path [2]:
* utils/genapply/Main.hs <= utils/genapply/GenApply.hs
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[2]: commit 0cc4aad36f
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8a5d81b9358466f8889f679bfea9f796d85f7f3">e8a5d81b</a></strong>
<div>
<span>by Jonathan DK Gibbons</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the `MatchResult` type in the desugarer
This way, it does a better job of proving whether or not the fail operator is used.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcb7fe5aa2bc331fa71b537b042ec08a7c79b1ac">dcb7fe5a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove panic in dsHandleMonadicFailure
Rework dsHandleMonadicFailure to be correct by construction instead of
using an unreachable panic.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cde23cd47170cc33845b6859a47dd06ee85094d8">cde23cd4</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Inline `adjustMatchResult`
It is just `fmap`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72cb6bcc23d2540274aac7d1b80682ef092f1615">72cb6bcc</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Generalize type of `matchCanFail`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/401f7bb312aa6c570287d313f8b587aaebca72b2">401f7bb3</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`MatchResult'` -> `MatchResult`
Inline `MatchResult` alias accordingly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c9fae2342f19ab3e6ac688825a3817b23bf1fcc">6c9fae23</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-22T23:11:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark DataCon wrappers CONLIKE
Now that DataCon wrappers don’t inline until phase 0 (see commit
b78cc64e923716ac0512c299f42d4d0012306c05), it’s important that
case-of-known-constructor and RULE matching be able to see saturated
applications of DataCon wrappers in unfoldings. Making them conlike is a
natural way to do it, since they are, in fact, precisely the sort of
thing the CONLIKE pragma exists to solve.
Fixes #18012.
This also bumps the version of the parsec submodule to incorporate a
patch that avoids a metric increase on the haddock perf tests. The
increase was not really a flaw in this patch, as parsec was implicitly
relying on inlining heuristics. The patch to parsec just adds some
INLINABLE pragmas, and we get a nice performance bump out of it (well
beyond the performance we lost from this patch).
Metric Decrease:
T12234
WWRec
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/48b8951e819e5d7d06ad7e168323de320d87bbd6">48b8951e</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-04-22T23:11:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix tab-completion for :break (#17989)
In tab-completion for the `:break` command, only those
identifiers should be shown, that are accepted in the
`:break` command. Hence these identifiers must be
- defined in an interpreted module
- top-level
- currently in scope
- listed in a `ModBreaks` value as a possible breakpoint.
The identifiers my be qualified or unqualified.
To get all possible top-level breakpoints for tab-completeion
with the correct qualification do:
1. Build the list called `pifsBreaks` of all pairs of
(Identifier, module-filename) from the `ModBreaks` values.
Here all identifiers are unqualified.
2. Build the list called `pifInscope` of all pairs of
(Identifiers, module-filename) with identifiers from
the `GlobalRdrEnv`. Take only those identifiers that are
in scope and have the correct prefix.
Here the identifiers may be qualified.
3. From the `pifInscope` list seclect all pairs that can be
found in the `pifsBreaks` list, by comparing only the
unqualified part of the identifier.
The remaining identifiers can be used for tab-completion.
This ensures, that we show only identifiers, that can be used
in a `:break` command.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34a45ee600d5346f5d1728047fa185698ed7ee84">34a45ee6</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-04-22T23:12:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC NCG: Add DWARF constants and debug labels
Fixes #11261
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffde234854f49dba9ec4735aad74b30fd2deee29">ffde2348</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-22T23:13:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do eager instantation in terms
This patch implements eager instantiation, a small but critical change
to the type inference engine, #17173. The main change is this:
When inferring types, always return an instantiated type
(for now, deeply instantiated; in future shallowly instantiated)
There is more discussion in
https://www.tweag.io/posts/2020-04-02-lazy-eager-instantiation.html
There is quite a bit of refactoring in this patch:
* The ir_inst field of GHC.Tc.Utils.TcType.InferResultk
has entirely gone. So tcInferInst and tcInferNoInst have collapsed
into tcInfer.
* Type inference of applications, via tcInferApp and
tcInferAppHead, are substantially refactored, preparing
the way for Quick Look impredicativity.
* New pure function GHC.Tc.Gen.Expr.collectHsArgs and applyHsArgs
are beatifully dual. We can see the zipper!
* GHC.Tc.Gen.Expr.tcArgs is now much nicer; no longer needs to return
a wrapper
* In HsExpr, HsTypeApp now contains the the actual type argument,
and is used in desugaring, rather than putting it in a mysterious
wrapper.
* I struggled a bit with good error reporting in
Unify.matchActualFunTysPart. It's a little bit simpler than before,
but still not great.
Some smaller things
* Rename tcPolyExpr --> tcCheckExpr
tcMonoExpr --> tcLExpr
* tcPatSig moves from GHC.Tc.Gen.HsType to GHC.Tc.Gen.Pat
Metric Decrease:
T9961
Reduction of 1.6% in comiler allocation on T9961, I think.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f84aca31290afc11acde0f86969a535e519e1d5">6f84aca3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-22T23:13:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Ensure that sigaction structs are initialized
I noticed these may have uninitialized fields when looking into #18037.
The reporter says that zeroing them doesn't fix the MSAN failures they
observe but zeroing them is the right thing to do regardless.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c29f0fa6ee831ec8a223561312d7176ef87a7ece">c29f0fa6</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-22T23:14:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add "ddump-cmm-opt" as alias for "ddump-opt-cmm".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b4a8b60a5b403e02117ab0a30a386664845586b">4b4a8b60</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-22T23:14:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Remove -fast-llvm flag
Issue #18076 drew my attention to the undocumented `-fast-llvm` flag for
the LLVM code generator introduced in
22733532171330136d87533d523f565f2a4f102f. Speaking to Moritz about this,
the motivation for this flag was to avoid potential incompatibilities
between LLVM and the assembler/linker toolchain by making LLVM
responsible for machine-code generation.
Unfortunately, this cannot possibly work: the LLVM backend's mangler
performs a number of transforms on the assembler generated by LLVM that
are necessary for correctness. These are currently:
* mangling Haskell functions' symbol types to be `object` instead of
`function` on ELF platforms (necessary for tables-next-to-code)
* mangling AVX instructions to ensure that we don't assume alignment
(which LLVM otherwise does)
* mangling Darwin's subsections-via-symbols directives
Given that these are all necessary I don't believe that we can support
`-fast-llvm`. Let's rather remove it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/831b66425aa3a24e769ace8d4649299ade021717">831b6642</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-04-22T23:15:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix build warning; add more informative information to the linker; fix linker for empty sections
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c409961aea59d2fe2ae71036a1ae6d94c4ee05c8">c409961a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-22T23:16:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update commentary and slightly refactor GHC.Tc.Deriv.Infer
There was some out-of-date commentary in `GHC.Tc.Deriv.Infer` that
has been modernized. Along the way, I removed the `bad` constraints
in `simplifyDeriv`, which did not serve any useful purpose (besides
being printed in debugging output).
Fixes #18073.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/125aa2b8b8bb402d7819c3a35255b65c15b8bf9a">125aa2b8</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-22T23:16:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove leftover comment in tcRnModule', redundant bind
The code for the comment was moved in dc8c03b2a5c but the comment was
forgotten.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ea37b01b6ab16937f7b528b6bbae9fade9f1361">8ea37b01</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-22T23:17:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: workaround a Linux kernel bug in timerfd
Reading a timerfd may return 0: https://lkml.org/lkml/2019/8/16/335.
This is currently undocumented behavior and documentation "won't happen
anytime soon" (https://lkml.org/lkml/2020/2/13/295).
With this patch, we just ignore the result instead of crashing. It may
fix #18033 but we can't be sure because we don't have enough
information.
See also this discussion about the kernel bug:
https://github.com/Azure/sonic-swss-common/pull/302/files/1f070e7920c2e5d63316c0105bf4481e73d72dc9
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e21f3023b095d9bbd000330b56aaaa2977134335">e21f3023</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-04-23T17:21:28+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Semigroup's (<>) for Doc/SDoc
Before this patch, Outputable.hs defined its own (<>) which caused
conflicts with (Data.Semigroup.<>) and thus led to inconvenience.
However, replacing it is not trivial due to a different fixity:
http://www.haskell.org/pipermail/libraries/2011-November/017066.html
Nevertheless, it is possible to update the pretty-printing code to work
with (<>) of a different fixitiy, and that's what this patch implements.
Now Doc and SDoc are instances of Semigroup.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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<a href="#31959c38fe93e481a7160526f11fa80db82d20b7">
compiler/GHC/CmmToAsm/Dwarf/Constants.hs
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<a href="#f71fa75baa7807186473f09c45a9ada1b72f4c6c">
compiler/GHC/CmmToAsm/PPC/CodeGen.hs
</a>
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<li class="file-stats">
<a href="#89f8a68c62e7b5e239f8d8d532820fc086d29140">
compiler/GHC/CmmToAsm/PPC/Instr.hs
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<a href="#3022d7d8a06ba257d13bbd18a3347522287aa684">
compiler/GHC/CmmToAsm/PPC/Ppr.hs
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<a href="#99b1dfe8e0e3d0c174cd8552df7d2ae70d35800a">
compiler/GHC/CmmToAsm/PPC/RegInfo.hs
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<a href="#c386b75e4b289cb23bf547322b74c30941596bae">
compiler/GHC/CmmToAsm/PPC/Regs.hs
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compiler/GHC/Core/SimpleOpt.hs
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compiler/GHC/Core/Utils.hs
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compiler/GHC/Driver/Main.hs
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<a href="#b8e6af642e56019828828dc679683c04afb81867">
compiler/GHC/Driver/Pipeline.hs
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compiler/GHC/Driver/Plugins.hs
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compiler/GHC/Driver/Session.hs
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compiler/GHC/Hs/Doc.hs
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compiler/GHC/Hs/Expr.hs
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compiler/GHC/Hs/Utils.hs
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compiler/GHC/HsToCore/Docs.hs
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compiler/GHC/HsToCore/Expr.hs
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compiler/GHC/HsToCore/Expr.hs-boot
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<a href="#83f0b13548ac43fe13b1813fb407249ff9b825f7">
compiler/GHC/HsToCore/GuardedRHSs.hs
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<a href="#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed">
compiler/GHC/HsToCore/Match.hs
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compiler/GHC/HsToCore/Match.hs-boot
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<a href="#b370399ae1ab68e37f0e631d98a45da6df9f011c">
compiler/GHC/HsToCore/Match/Constructor.hs
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<a href="#f017e4c978a9ff341ce5a7b838787fd2a4758b59">
compiler/GHC/HsToCore/Match/Literal.hs
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<a href="#c8a27621f82549165d8946ae8e9f467660958059">
compiler/GHC/HsToCore/Monad.hs
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<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
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<a href="#a90b29966ba2a86c0f6927651648cb062f00ea03">
compiler/GHC/HsToCore/PmCheck/Types.hs
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<a href="#94864be2e2eb1959a038d5d903a6c784e5cfb32a">
compiler/GHC/HsToCore/Utils.hs
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<a href="#ea70f9cf0a00327d944951cb4a4dfa9fe4194b2d">
compiler/GHC/Iface/Ext/Types.hs
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compiler/GHC/Iface/Recomp.hs
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<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
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