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<h3>
Ben Gamari pushed to branch wip/bump-win32
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/aee45d9ea8c6cf4ebad4d5c732748923c7865cbe">aee45d9e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-27T07:06:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve NegativeLiterals (#18022, GHC Proposal #344)
Before this patch, NegativeLiterals used to parse x-1 as x (-1).
This may not be what the user expects, and now it is fixed:
x-1 is parsed as (-) x 1.
We achieve this by the following requirement:
* When lexing a negative literal,
it must not be preceded by a 'closing token'.
This also applies to unboxed literals, e.g. -1#.
See GHC Proposal #229 for the definition of a closing token.
A nice consequence of this change is that -XNegativeLiterals becomes a
subset of -XLexicalNegation. In other words, enabling both of those
extensions has the same effect as enabling -XLexicalNegation alone.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/667ab69e5edacb2ce2f42fb810cd54c8f856d30b">667ab69e</a></strong>
<div>
<span>by leiftw</span>
<i>at 2020-07-27T07:07:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix typo referring to non-existent `-ohidir` flag, should be `-hidir` I think</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ff89c173f39813f74d7bbf95770c5e40039f155">6ff89c17</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-27T07:08:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the parser a little
* Create a dedicated production for type operators
* Create a dedicated type for the UNPACK pragma
* Remove an outdated part of Note [Parsing data constructors is hard]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa054d32a8ff69c334293a0d6c9d11b83a236a96">aa054d32</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:09:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Drop 32-bit Windows support
As noted in #18487, we have reached the end of this road.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6da73bbf97cca8bd64d70a26298e7f7ddad2ce52">6da73bbf</a></strong>
<div>
<span>by Michalis Pardalos</span>
<i>at 2020-07-27T20:09:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add minimal test for #12492
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47680cb76b068508fd16d052e0a3bed12e38ea5f">47680cb7</a></strong>
<div>
<span>by Michalis Pardalos</span>
<i>at 2020-07-27T20:09:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use allocate, not ALLOC_PRIM_P for unpackClosure#
ALLOC_PRIM_P fails for large closures, by directly using allocate
we can handle closures which are larger than the block size.
Fixes #12492
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d345c9680ab3d766ef43dd8389ccc1eaeca066c">3d345c96</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-27T20:10:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Eta-expand the Simplifier monad
This patch eta-expands the Simplifier's monad, using the method
explained in GHC.Core.Unify Note [The one-shot state monad trick].
It's part of the exta-expansion programme in #18202.
It's a tiny patch, but is worth a 1-2% reduction in bytes-allocated
by the compiler. Here's the list, based on the compiler-performance
tests in perf/compiler:
Reduction in bytes allocated
T10858(normal) -0.7%
T12425(optasm) -1.3%
T13056(optasm) -1.8%
T14683(normal) -1.1%
T15164(normal) -1.3%
T15630(normal) -1.4%
T17516(normal) -2.3%
T18282(normal) -1.6%
T18304(normal) -0.8%
T1969(normal) -0.6%
T4801(normal) -0.8%
T5321FD(normal) -0.7%
T5321Fun(normal) -0.5%
T5642(normal) -0.9%
T6048(optasm) -1.1%
T9020(optasm) -2.7%
T9233(normal) -0.7%
T9675(optasm) -0.5%
T9961(normal) -2.9%
WWRec(normal) -1.2%
Metric Decrease:
T12425
T9020
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57aca6bba1c000f8542ce94e8b724b0334ff96d4">57aca6bb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:10:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Ensure that Hadrian jobs don't download artifacts
Previously the Hadrian jobs had the default dependencies, meaning that
they would download artifacts from all jobs of earlier stages. This is
unneccessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a815cea9fa11ce6ef22aec3525dd7a0df541daf">0a815cea</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:10:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump bootstrap compiler to 8.8.4
Hopefully this will make the Windows jobs a bit more reliable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bd60059b0edfee9e8f66c6817257bbb946656cd">0bd60059</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-28T02:01:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">This patch addresses the exponential blow-up in the simplifier.
Specifically:
#13253 exponential inlining
#10421 ditto
#18140 strict constructors
#18282 another nested-function call case
This patch makes one really significant changes: change the way that
mkDupableCont handles StrictArg. The details are explained in
GHC.Core.Opt.Simplify Note [Duplicating StrictArg].
Specific changes
* In mkDupableCont, when making auxiliary bindings for the other arguments
of a call, add extra plumbing so that we don't forget the demand on them.
Otherwise we haev to wait for another round of strictness analysis. But
actually all the info is to hand. This change affects:
- Make the strictness list in ArgInfo be [Demand] instead of [Bool],
and rename it to ai_dmds.
- Add as_dmd to ValArg
- Simplify.makeTrivial takes a Demand
- mkDupableContWithDmds takes a [Demand]
There are a number of other small changes
1. For Ids that are used at most once in each branch of a case, make
the occurrence analyser record the total number of syntactic
occurrences. Previously we recorded just OneBranch or
MultipleBranches.
I thought this was going to be useful, but I ended up barely
using it; see Note [Note [Suppress exponential blowup] in
GHC.Core.Opt.Simplify.Utils
Actual changes:
* See the occ_n_br field of OneOcc.
* postInlineUnconditionally
2. I found a small perf buglet in SetLevels; see the new
function GHC.Core.Opt.SetLevels.hasFreeJoin
3. Remove the sc_cci field of StrictArg. I found I could get
its information from the sc_fun field instead. Less to get
wrong!
4. In ArgInfo, arrange that ai_dmds and ai_discs have a simpler
invariant: they line up with the value arguments beyond ai_args
This allowed a bit of nice refactoring; see isStrictArgInfo,
lazyArgcontext, strictArgContext
There is virtually no difference in nofib. (The runtime numbers
are bogus -- I tried a few manually.)
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
fft +0.0% -2.0% -48.3% -49.4% 0.0%
multiplier +0.0% -2.2% -50.3% -50.9% 0.0%
--------------------------------------------------------------------------------
Min -0.4% -2.2% -59.2% -60.4% 0.0%
Max +0.0% +0.1% +3.3% +4.9% 0.0%
Geometric Mean +0.0% -0.0% -33.2% -34.3% -0.0%
Test T18282 is an existing example of these deeply-nested strict calls.
We get a big decrease in compile time (-85%) because so much less
inlining takes place.
Metric Decrease:
T18282
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ee07b494ddd0131d53ea2fd6a4bb29cd05f4dd8">6ee07b49</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-28T02:02:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add support for negative shifts (fix #18499)
shiftR/shiftL support negative arguments despite Haskell 2010 report
saying otherwise. We explicitly test for negative values which is bad
(it gets in the way of constant folding, etc.). Anyway, for consistency
we fix Bits instancesof Integer/Natural.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f305bbfd0d7afee8fe7464252fbfc167205220ae">f305bbfd</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-07-28T02:03:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">config: Fix Haskell platform constructor w/ params
Fixes #18505
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/318bb17c9d3fbbe68eff706c38eb8e653cea3d83">318bb17c</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-07-28T20:54:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in haddock
Spotted by `vilpan` on `#haskell`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39c89862161bf488a6aca9372cbb67690f436ce7">39c89862</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-07-28T20:54:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc/mk: don't build gmp packages for BIGNUM_BACKEND=native
Before this change make-based `BIGNUM_BACKEND=native` build was failing as:
```
x86_64-pc-linux-gnu-gcc: error: libraries/ghc-bignum/gmp/objs/*.o: No such file or directory
```
This happens because ghc.mk was pulling in gmp-dependent
ghc-bignum library unconditionally. The change avoid building
ghc-bignum.
Bug: https://gitlab.haskell.org/ghc/ghc/-/issues/18437
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9a880fce484d0a87bb794b9d2d8a73e54819011">b9a880fc</a></strong>
<div>
<span>by Felix Wiemuth</span>
<i>at 2020-07-29T15:06:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c59064b0c60d3d779f5fd067be4b6648d8de23cf">c59064b0</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #16341
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a61411cab31fcc08f1dcd629b85c736e2b5b6bc7">a61411ca</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass dit_rep_tc_args to dsm_stock_gen_fn
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a26498daa4d87a15b3e829c204ed6e9b4323f684">a26498da</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass tc_args to gen_fn
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44b11bad052eabf43246acba6aab814376b08713">44b11bad</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Filter out unreachable constructors when deriving stock instances (#16431)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bbc5191640761ca9773abc898c077363b7beb4e7">bbc51916</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-29T15:07:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Kill off sc_mult and as_mult fields
They are readily derivable from other fields, so this is more
efficient, and less error prone.
Fixes #18494
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3db4b4c5b7f5d2a62ebd88e174fca07d04c4e18">e3db4b4c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-07-29T15:08:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix build system on ARM
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96c31ea1f0303ebabc59edccff2e88444fe02722">96c31ea1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-29T15:09:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix bug in Natural multiplication (fix #18509)
A bug was lingering in Natural multiplication (inverting two limbs)
despite QuickCheck tests used during the development leading to wrong
results (independently of the selected backend).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e1dc3d7b89ea79aea158ee487234d3730e857f04">e1dc3d7b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-29T15:09:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix validation errors (#18510)
Test T2632 is a stage1 test that failed because of the Q => Quote change.
The remaining tests did not use quotation and failed when the path
contained a space.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c68a84254d70280e2dc73485f361787a3503850">6c68a842</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-30T07:11:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">For `-fkeep-going` do not duplicate dependency edge code
We now compute the deps for `-fkeep-going` the same way that the
original graph calculates them, so the edges are correct. Upsweep really
ought to take the graph rather than a topological sort so we are never
recalculating anything, but at least things are recaluclated
consistently now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/502de55676a38572db60848c13392f5f115e1c8a">502de556</a></strong>
<div>
<span>by cgibbard</span>
<i>at 2020-07-30T07:11:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add haddock comment for unfilteredEdges
and move the note about drop_hs_boot_nodes into it.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7">01c948eb</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-30T07:11:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up the inferred type variable restriction
This patch primarily:
* Documents `checkInferredVars` (previously called
`check_inferred_vars`) more carefully. This is the
function which throws an error message if a user quantifies an
inferred type variable in a place where specificity cannot be
observed. See `Note [Unobservably inferred type variables]` in
`GHC.Rename.HsType`.
Note that I now invoke `checkInferredVars` _alongside_
`rnHsSigType`, `rnHsWcSigType`, etc. rather than doing so _inside_
of these functions. This results in slightly more call sites for
`checkInferredVars`, but it makes it much easier to enumerate the
spots where the inferred type variable restriction comes into
effect.
* Removes the inferred type variable restriction for default method
type signatures, per the discussion in #18432. As a result, this
patch fixes #18432.
Along the way, I performed some various cleanup:
* I moved `no_nested_foralls_contexts_err` into `GHC.Rename.Utils`
(under the new name `noNestedForallsContextsErr`), since it now
needs to be invoked from multiple modules. I also added a helper
function `addNoNestedForallsContextsErr` that throws the error
message after producing it, as this is a common idiom.
* In order to ensure that users cannot sneak inferred type variables
into `SPECIALISE instance` pragmas by way of nested `forall`s, I
now invoke `addNoNestedForallsContextsErr` when renaming
`SPECIALISE instance` pragmas, much like when we rename normal
instance declarations. (This probably should have originally been
done as a part of the fix for #18240, but this task was somehow
overlooked.) As a result, this patch fixes #18455 as a side effect.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d47324ce49b0c4f419823cbd7fd47e134a1b255a">d47324ce</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-30T07:12:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't mark closed type family equations as occurrences
Previously, `rnFamInstEqn` would mark the name of the type/data
family used in an equation as an occurrence, regardless of what sort
of family it is. Most of the time, this is the correct thing to do.
The exception is closed type families, whose equations constitute its
definition and therefore should not be marked as occurrences.
Overzealously counting the equations of a closed type family as
occurrences can cause certain warnings to not be emitted, as observed
in #18470. See `Note [Type family equations and occurrences]` in
`GHC.Rename.Module` for the full story.
This fixes #18470 with a little bit of extra-casing in
`rnFamInstEqn`. To accomplish this, I added an extra
`ClosedTyFamInfo` field to the `NonAssocTyFamEqn` constructor of
`AssocTyFamInfo` and refactored the relevant call sites accordingly
so that this information is propagated to `rnFamInstEqn`.
While I was in town, I moved `wrongTyFamName`, which checks that the
name of a closed type family matches the name in an equation for that
family, from the renamer to the typechecker to avoid the need for an
`ASSERT`. As an added bonus, this lets us simplify the details of
`ClosedTyFamInfo` a bit.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebe2cf4538fa46994ef67663ac8fd5e579579803">ebe2cf45</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-30T07:12:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove an incorrect WARN in extendLocalRdrEnv
I noticed this warning going off, and discovered that it's
really fine. This small patch removes the warning, and docments
what is going on.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f71f69714255165d0fdc2790a588487ff9439dc">9f71f697</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-30T07:13:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two bangs to improve perf of flattening
This tiny patch improves the compile time of flatten-heavy
programs by 1-2%, by adding two bangs.
Addresses (somewhat) #18502
This reduces allocation by
T9872b -1.1%
T9872d -3.3%
T5321Fun -0.2%
T5631 -0.2%
T5837 +0.1%
T6048 +0.1%
Metric Decrease:
T9872b
T9872d
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c274cd530cc42a26028050b75d56b3437e06ec1">7c274cd5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:54:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix minimal imports dump for boot files (fix #18497)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/175cb5b4044e6f4ad2224f54115f42e7a8b08f9b">175cb5b4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:55:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't use sdocWithDynFlags in datacon ppr
We don't need to use `sdocWithDynFlags` to know whether we should
display linear types for datacon types, we already have
`sdocLinearTypes` field in `SDocContext`. Moreover we want to remove
`sdocWithDynFlags` (#10143, #17957)).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/380638a33691ba43fdcd2e18bca636750e5f66f1">380638a3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:56:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: fix powMod for gmp backend (#18515)
Also reenable integerPowMod test which had never been reenabled by
mistake.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/56a7c19337c5b2aa21d521a6d7c965174ec8379b">56a7c193</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-31T19:32:09+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CLabel pretty-printing
Pretty-printing CLabel relies on sdocWithDynFlags that we want to remove
(#10143, #17957). It uses it to query the backend and the platform.
This patch exposes Clabel ppr functions specialised for each backend so
that backend code can directly use them.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b15dc3cfb1a33e3d4d952af62d4d0b841a731f5">3b15dc3c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-31T19:32:09+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't use sdocWithDynFlags in GHC.CmmToAsm.Dwarf.Types
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e30fed6c6de1f881ce313900274294a793e42677">e30fed6c</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-01T04:23:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Test case for #17652
The issue was fixed by 19e80b9af252eee760dc047765a9930ef00067ec
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/226417424b2b578fd3c5424588367cb24e7720eb">22641742</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-02T16:44:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove ConDeclGADTPrefixPs
This removes the `ConDeclGADTPrefixPs` per the discussion in #18517.
Most of this patch simply removes code, although the code in the
`rnConDecl` case for `ConDeclGADTPrefixPs` had to be moved around a
bit:
* The nested `forall`s check now lives in the `rnConDecl` case for
`ConDeclGADT`.
* The `LinearTypes`-specific code that used to live in the
`rnConDecl` case for `ConDeclGADTPrefixPs` now lives in
`GHC.Parser.PostProcess.mkGadtDecl`, which is now monadic so that
it can check if `-XLinearTypes` is enabled.
Fixes #18157.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2d1accf67cb6e1dab6b2c78fef4b64526c31a4a">f2d1accf</a></strong>
<div>
<span>by Leon Schoorl</span>
<i>at 2020-08-02T16:44:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GHC_STAGE definition generated by make
Fixes #18070
GHC_STAGE is the stage of the compiler we're building, it should be 1,2(,3?).
But make was generating 0 and 1.
Hadrian does this correctly using a similar `+ 1`:
https://gitlab.haskell.org/ghc/ghc/-/blob/eb8115a8c4cbc842b66798480fefc7ab64d31931/hadrian/src/Rules/Generate.hs#L245
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/947206f478d4eef641dfc58cb4c13471a23260c3">947206f4</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-08-03T07:52:33+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix running stage0/bin/ghc with wrong package DB. Fixes #17468.
In the invocation of `cabal configure`, `--ghc-pkg-option=--global-package-db`
was already given correctly to tell `stage0/bin/ghc-pkg` that it should use
the package DB in `stage1/`.
However, `ghc` needs to be given this information as well, not only `ghc-pkg`!
Until now that was not the case; the package DB in `stage0` was given to
`ghc` instead.
This was wrong, because there is no binary compatibility guarantee that says
that the `stage0` DB's `package.cache` (which is written by the
stage0 == system-provided ghc-pkg) can be deserialised by the `ghc-pkg`
from the source code tree.
As a result, when trying to add fields to `InstalledPackageInfo` that get
serialised into / deserialised from the `package.cache`, errors like
_build/stage0/lib/package.conf.d/package.cache: GHC.PackageDb.readPackageDb: inappropriate type (Not a valid Unicode code point!)
would appear. This was because the `stage0/bin/ghc would try to
deserialise the newly added fields from
`_build/stage0/lib/package.conf.d/package.cache`, but they were not in there
because the system `ghc-pkg` doesn't know about them and thus didn't write them
there.
It would try to do that because any GHC by default tries to read the global
package db in `../lib/package.conf.d/package.cache`.
For `stage0/bin/ghc` that *can never work* as explained above, so we
must disable this default via `-no-global-package-db` and give it the
correct package DB explicitly.
This is the same problem as #16534, and the same fix as in MR !780
(but in another context; that one was for developers trying out the
`stage0/bin/ghc` == `_build/ghc-stage1` interactively, while this fix
is for a `cabal configure` invocation).
I also noticed that the fix for #16534 forgot to pass `-no-global-package-db`,
and have fixed that in this commit as well.
It only worked until now because nobody tried to add a new ghc-pkg `.conf`
field since the introduction of Hadrian.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef2ae81a394df573510b12b7e11bba0c931249d8">ef2ae81a</a></strong>
<div>
<span>by Alex Biehl</span>
<i>at 2020-08-03T07:52:33+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hardcode RTS includes to cope with unregistered builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d613ed7624cbf39192d2a8cf29ab0c0fd2980a15">d613ed76</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-05T03:59:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add backward compat integer-gmp functions
Also enhance bigNatCheck# and isValidNatural test
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f2f771869c65125ba013a5dd2b213061efe0fc2">3f2f7718</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-05T03:59:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add more BigNat compat functions in integer-gmp
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e12cd1733b581f48a5873b12971b6974778eabb">5e12cd17</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-05T04:00:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename Core.Opt.Driver -> Core.Opt.Pipeline
Closes #18504.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bff2f87e43985e02bdde8c6fa39279df86cb617">2bff2f87</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-05T04:00:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "iserv: Don't pass --export-dynamic on FreeBSD"
This reverts commit 2290eb02cf95e9cfffcb15fc9c593d5ef79c75d9.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53ce0db5a06598c88c6b8cb32043b878e7083dd4">53ce0db5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-05T04:00:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor handling of object merging
Previously to merge a set of object files we would invoke the linker as
usual, adding -r to the command-line. However, this can result in
non-sensical command-lines which causes lld to balk (#17962).
To avoid this we introduce a new tool setting into GHC, -pgmlm, which is
the linker which we use to merge object files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb7013c3037538aa9c947a21dbbfd7c297929ac8">eb7013c3</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-08-05T04:01:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove all the unnecessary LANGUAGE pragmas
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbcb886d503dd7aaebc4c40e59615068b3fd0bd7">fbcb886d</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-05T04:01:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make CodeQ and TExpQ levity polymorphic
The patch is quite straightforward. The only tricky part is that
`Language.Haskell.TH.Lib.Internal` now must be `Trustworthy` instead
of `Safe` due to the `GHC.Exts` import (in order to import `TYPE`).
Since `CodeQ` has yet to appear in any released version of
`template-haskell`, I didn't bother mentioning the change to `CodeQ`
in the `template-haskell` release notes.
Fixes #18521.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/686e06c59c3aa6b66895e8a501c7afb019b09e36">686e06c5</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Grammar for types and data/newtype constructors
Before this patch, we parsed types into a reversed sequence
of operators and operands. For example, (F x y + G a b * X)
would be parsed as [X, *, b, a, G, +, y, x, F],
using a simple grammar:
tyapps
: tyapp
| tyapps tyapp
tyapp
: atype
| PREFIX_AT atype
| tyop
| unpackedness
Then we used a hand-written state machine to assemble this
either into a type, using 'mergeOps',
or into a constructor, using 'mergeDataCon'.
This is due to a syntactic ambiguity:
data T1 a = MkT1 a
data T2 a = Ord a => MkT2 a
In T1, what follows after the = sign is a data/newtype constructor
declaration. However, in T2, what follows is a type (of kind
Constraint). We don't know which of the two we are parsing until we
encounter =>, and we cannot check for => without unlimited lookahead.
This poses a few issues when it comes to e.g. infix operators:
data I1 = Int :+ Bool :+ Char -- bad
data I2 = Int :+ Bool :+ Char => MkI2 -- fine
By this issue alone we are forced into parsing into an intermediate
representation and doing a separate validation pass.
However, should that intermediate representation be as low-level as a
flat sequence of operators and operands?
Before GHC Proposal #229, the answer was Yes, due to some particularly
nasty corner cases:
data T = ! A :+ ! B -- used to be fine, hard to parse
data T = ! A :+ ! B => MkT -- bad
However, now the answer is No, as this corner case is gone:
data T = ! A :+ ! B -- bad
data T = ! A :+ ! B => MkT -- bad
This means we can write a proper grammar for types, overloading it in
the DisambECP style, see Note [Ambiguous syntactic categories].
With this patch, we introduce a new class, DisambTD. Just like
DisambECP is used to disambiguate between expressions, commands, and patterns,
DisambTD is used to disambiguate between types and data/newtype constructors.
This way, we get a proper, declarative grammar for constructors and
types:
infixtype
: ftype
| ftype tyop infixtype
| unpackedness infixtype
ftype
: atype
| tyop
| ftype tyarg
| ftype PREFIX_AT tyarg
tyarg
: atype
| unpackedness atype
And having a grammar for types means we are a step closer to using a
single grammar for types and expressions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6770e199645b0753d2edfddc68c199861a1be980">6770e199</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up the story around runPV/runECP_P/runECP_PV
This patch started as a small documentation change, an attempt to make
Note [Parser-Validator] and Note [Ambiguous syntactic categories]
more clear and up-to-date.
But it turned out that runECP_P/runECP_PV are weakly motivated,
and it's easier to remove them than to find a good rationale/explanation
for their existence.
As the result, there's a bit of refactoring in addition to
a documentation update.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/826d07db0e0f31fe2b2d2e0661be7f0cb3cde3c7">826d07db</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix debug_ppr_ty ForAllTy (#18522)
Before this change, GHC would
pretty-print forall k. forall a -> ()
as forall @k a. ()
which isn't even valid Haskell.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ddb43848b9fc24f5404915f57dc504546e68292">0ddb4384</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix visible forall in ppr_ty (#18522)
Before this patch, this type:
T :: forall k -> (k ~ k) => forall j -> k -> j -> Type
was printed incorrectly as:
T :: forall k j -> (k ~ k) => k -> j -> Type
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2a432258fa00e22ca386ef30d0a77ff5b277db8">d2a43225</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fail eagerly on a lev-poly datacon arg
Close #18534.
See commentary in the patch.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63348155404c64334fa864454132630f9d2a4d7f">63348155</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-06T13:34:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a type alias for Ways
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9570c21295a2b4a1d1e40939869124f0b9b9bf91">9570c212</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-06T19:46:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Rename 8.12 to 9.0
GHC 8.12.1 has been renamed to GHC 9.0.1.
See also:
https://mail.haskell.org/pipermail/ghc-devs/2020-July/019083.html
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c403006c13f161881e50ccbb9c6761fcbfc4ce03">c403006c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-06T19:59:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Win32 and process submodules
</pre>
</li>
</ul>
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.gitlab-ci.yml
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aclocal.m4
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compiler/GHC/Cmm/CLabel.hs
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compiler/GHC/Cmm/Info.hs
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compiler/GHC/CmmToAsm/Dwarf/Types.hs
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compiler/GHC/Core/DataCon.hs
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compiler/GHC/Driver/Make.hs
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