<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html lang="en">
<head>
<meta content="text/html; charset=US-ASCII" http-equiv="Content-Type">
<title>
GitLab
</title>
<style>img {
max-width: 100%; height: auto;
}
</style>
</head>
<body>
<div class="content">
<h3>
Simon Peyton Jones pushed to branch wip/spj-wibbles
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/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/723062edf6191084a99787d3f235183cf6b7d051">723062ed</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-10T09:18:14+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Move no_lint to the top level, tweak hie002
- We don't want to benchmark linting so disable lints in hie002 perf
test
- Move no_lint to the top-level to be able to use it in tests other than
those in `testsuite/tests/perf/compiler`.
- Filter out -dstg-lint in no_lint.
- hie002 allocation numbers on 32-bit are unstable, so skip it on 32-bit
Metric Decrease:
hie002
ManyConstructors
T12150
T12234
T13035
T1969
T4801
T9233
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcafaa82a0223afd5d103e052ab9a097a676e5ea">bcafaa82</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-04-10T19:29:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: mark T11531 fragile
The test depends on a link editor allowing undefined symbols in an ELF
shared object. This is the standard but it seems some distributions
patch their link editor. See the report by @hsyl20 in #11531.
Fixes #11531
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0889f5eecfea8af6a9d74d48d9d86ff3aea331d6">0889f5ee</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-04-12T11:44:52+09:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix comment for a language extension
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd4f92b5f4251f1a37d1e08ee97d99f2ccb41f26">cd4f92b5</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-12T11:20:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Significant refactor of Lint
This refactoring of Lint was triggered by #17923, which is
fixed by this patch.
The main change is this. Instead of
lintType :: Type -> LintM LintedKind
we now have
lintType :: Type -> LintM LintedType
Previously, all of typeKind was effectively duplicate in lintType.
Moreover, since we have an ambient substitution, we still had to
apply the substition here and there, sometimes more than once. It
was all very tricky, in the end, and made my head hurt.
Now, lintType returns a fully linted type, with all substitutions
performed on it. This is much simpler.
The same thing is needed for Coercions. Instead of
lintCoercion :: OutCoercion
-> LintM (LintedKind, LintedKind,
LintedType, LintedType, Role)
we now have
lintCoercion :: Coercion -> LintM LintedCoercion
Much simpler! The code is shorter and less bug-prone.
There are a lot of knock on effects. But life is now better.
Metric Decrease:
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0efaf301fec9ed9ea827392cbe03de3335e995c7">0efaf301</a></strong>
<div>
<span>by Josh Meredith</span>
<i>at 2020-04-12T11:21:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement extensible interface files
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54ca66a7d30d7f7cfbf3753ebe547f5a20d76b96">54ca66a7</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-12T11:22:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use conLikeUserTyVarBinders to quantify field selector types
This patch:
1. Writes up a specification for how the types of top-level field
selectors should be determined in a new section of the GHC User's
Guide, and
2. Makes GHC actually implement that specification by using
`conLikeUserTyVarBinders` in `mkOneRecordSelector` to preserve the
order and specificity of type variables written by the user.
Fixes #18023.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35799dda07813e4c510237290a631d4d11fb92d2">35799dda</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-12T11:22:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Don't --export-dynamic on Darwin
When fixing #17962 I neglected to consider that --export-dynamic is only
supported on ELF platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8029816fda7602a8163c4d2703ff02982a3e48c">e8029816</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-12T11:23:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add an INLINE pragma to Control.Category.>>>
This fixes #18013 by adding INLINE pragmas to both Control.Category.>>>
and GHC.Desugar.>>>. The functional change in this patch is tiny (just
two lines of pragmas!), but an accompanying Note explains in gory
detail what’s going on.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0da186c1b5a47e08e91c1c674d46c040c83932fc">0da186c1</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-04-14T07:55:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Change zipWith to zipWithEqual in a few places
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/074c1ccd3f8c3fcab117e336316173e8e869230a">074c1ccd</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-14T07:55:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small change to the windows ticker.
We already have a function to go from time to ms so use it.
Also expand on the state of timer resolution.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b69cc8842aa7e2df52b92a9c9ad3b9d8dcf624ab">b69cc884</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-04-14T07:56:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: get rid of unnecessary levels of nesting in source-dist
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0c3b0696f1ca809ebd83b5fc2c0b911cde38e77">d0c3b069</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-04-14T07:57:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc (Foldable): Add examples to Data.Foldable
See #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b08e0c06e038448a63aa9bd7f163b23d824ba4b">5b08e0c0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-14T23:28:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">StgCRun: Enable unwinding only on Linux
It's broken on macOS due and SmartOS due to assembler differences
(#15207) so let's be conservative in enabling it. Also, refactor things
to make the intent clearer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27cc2e7b1c1268e59c9d16b4530f27c0d40e9464">27cc2e7b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-14T23:28:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Don't mark evacuate_large as inline
This function has two callsites and is quite large. GCC consequently
decides not to inline and warns instead. Given the situation, I can't
blame it. Let's just remove the inline specifier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9853fc5e3556e733b56976b0a2fce9e82130a9ef">9853fc5e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-14T23:29:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Enable large file support for OFD locking impl.
Not only is this a good idea in general but this should also avoid
issue #17950 by ensuring that off_t is 64-bits.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b41f21bbfa9e266ba6654b08c3f9fec549c8bca">7b41f21b</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-04-14T23:30:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Make -i paths absolute
The primary reason for this change is that ghcide does not work with
relative paths. It also matches what cabal and stack do, they always
pass absolute paths.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41230e2601703df0233860be3f7d53f3a01bdbe5">41230e26</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Zero out pinned block alignment slop when profiling
The heap profiler currently cannot traverse pinned blocks because of
alignment slop. This used to just be a minor annoyance as the whole block
is accounted into a special cost center rather than the respective object's
CCS, cf. #7275. However for the new root profiler we would like to be able
to visit _every_ closure on the heap. We need to do this so we can get rid
of the current 'flip' bit hack in the heap traversal code.
Since info pointers are always non-zero we can in principle skip all the
slop in the profiler if we can rely on it being zeroed. This assumption
caused problems in the past though, commit a586b33f8e ("rts: Correct
handling of LARGE ARR_WORDS in LDV profiler"), part of !1118, tried to use
the same trick for BF_LARGE objects but neglected to take into account that
shrink*Array# functions don't ensure that slop is zeroed when not
compiling with profiling.
Later, commit 0c114c6599 ("Handle large ARR_WORDS in heap census (fix
as we will only be assuming slop is zeroed when profiling is on.
This commit also reduces the ammount of slop we introduce in the first
place by calculating the needed alignment before doing the allocation for
small objects where we know the next available address. For large objects
we don't know how much alignment we'll have to do yet since those details
are hidden behind the allocateMightFail function so there we continue to
allocate the maximum additional words we'll need to do the alignment.
So we don't have to duplicate all this logic in the cmm code we pull it
into the RTS allocatePinned function instead.
Metric Decrease:
T7257
haddock.Cabal
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15fa9bd6dd2d0b8d1fcd7135c85ea0d60853340d">15fa9bd6</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Expand and add more notes regarding slop
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/caf3f444bcc29f75145834207da00d938c08c2d3">caf3f444</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: allocatePinned: Fix confusion about word/byte units
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3c0f662df06500a11970fd391d0a88e081a5296">c3c0f662</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Underline some Notes as is conventional
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e149dea9bb89b77d34f50075946d6b4751a974f0">e149dea9</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix nomenclature in OVERWRITING_CLOSURE macros
The additional commentary introduced by commit 8916e64e5437 ("Implement
shrinkSmallMutableArray# and resizeSmallMutableArray#.") unfortunately got
this wrong. We set 'prim' to true in overwritingClosureOfs because we
_don't_ want to call LDV_recordDead().
The reason is because of this "inherently used" distinction made in the LDV
profiler so I rename the variable to be more appropriate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1dd3d18c2afd9e6009cd53295d26f8b31ca58fec">1dd3d18c</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove call to LDV_RECORD_CREATE for array resizing
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19de2fb090a25ab0d640d0cd5aef09f35e7455a0">19de2fb0</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Assert LDV_recordDead is not called for inherently used closures
The comments make it clear LDV_recordDead should not be called for
inhererently used closures, so add an assertion to codify this fact.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b934e30417a767063625494ecf135c9d6006f71">0b934e30</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-14T23:32:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump template-haskell version to 2.17.0.0
This requires bumping the `exceptions` and `text` submodules to bring
in commits that bump their respective upper version bounds on
`template-haskell`.
Fixes #17645. Fixes #17696.
Note that the new `text` commit includes a fair number of additions
to the Haddocks in that library. As a result, Haddock has to do more
work during the `haddock.Cabal` test case, increasing the number of
allocations it requires. Therefore,
-------------------------
Metric Increase:
haddock.Cabal
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22cc8e513fcfa89a4391f075534d903596a05895">22cc8e51</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-15T17:48:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18052 by using pprPrefixOcc in more places
This fixes several small oversights in the choice of pretty-printing
function to use. Fixes #18052.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ec77b2f16a78b13f54794c954953d8878dea9db2">ec77b2f1</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-15T17:49:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: ProfHeap: Fix wrong time in last heap profile sample
We've had this longstanding issue in the heap profiler, where the time of
the last sample in the profile is sometimes way off causing the rendered
graph to be quite useless for long runs.
It seems to me the problem is that we use mut_user_time() for the last
sample as opposed to getRTSStats(), which we use when calling heapProfile()
in GC.c.
The former is equivalent to getProcessCPUTime() but the latter does
some additional stuff:
getProcessCPUTime() - end_init_cpu - stats.gc_cpu_ns -
stats.nonmoving_gc_cpu_ns
So to fix this just use getRTSStats() in both places.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85fc32f03a6df92ec8d4ec9accca3c11b31a1596">85fc32f0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-17T12:45:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix dyn_o/dyn_hi rule (#17534)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfde3b76ac7f5a72eca012fe34ac1340a5ce2011">bfde3b76</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-17T12:46:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18065 by fixing an InstCo oversight in Core Lint
There was a small thinko in Core Lint's treatment of `InstCo`
coercions that ultimately led to #18065. The fix: add an apostrophe.
That's it!
Fixes #18065.
Co-authored-by: Simon Peyton Jones <simonpj@microsoft.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a05348ebaa11d563ab2e33325055317ff3cb8afc">a05348eb</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Change the fail operator argument of BindStmt to be a Maybe
Don't use noSyntaxExpr for it. There is no good way to defensively case
on that, nor is it clear one ought to do so.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/79e27144db7011f6d01a2f5ed15fd110d579bb8e">79e27144</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use trees that grow for rebindable operators for `<-` binds
Also add more documentation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18bc16ed78dfa1fe9498c5ac1ca38e9f84267872">18bc16ed</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use FailOperator in more places, define a couple datatypes (XBindStmtRn and XBindStmtTc) to help clarify the meaning of XBindStmt in the renamer and typechecker
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84cc8394d075cea236faa0bcd9ef0a84de89ee8c">84cc8394</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-18T13:20:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a missing zonk in tcHsPartialType
I omitted a vital zonk when refactoring tcHsPartialType in
commit 48fb3482f8cbc8a4b37161021e846105f980eed4
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date: Wed Jun 5 08:55:17 2019 +0100
Fix typechecking of partial type signatures
This patch fixes it and adds commentary to explain why.
Fixes #18008
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ee96ac1aa2cbff4e70bc45988930d64599029f2">2ee96ac1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</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/434312e5fdde91d6ad7b6d199bbb560a72ab6b89">434312e5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Enable FreeBSD job for so-labelled MRs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ddffb2278a22b7c0e3a9fce11ada67a471243409">ddffb227</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use rules syntax for conditional jobs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2586828a30202a28dcacac9ab7fc83c43da9e02">e2586828</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</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/15ab6cd548f284732a7f89d78c2b89b1bfc4ea1d">15ab6cd5</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-18T13:21:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve prepForeignCall error reporting
Show parameters and description of the error code when ffi_prep_cif
fails.
This may be helpful for debugging #17018.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ca52151881451ce5b3a7740d003e811b586140d">3ca52151</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-18T20:04:14+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Core.Opt renaming
* GHC.Core.Op => GHC.Core.Opt
* GHC.Core.Opt.Simplify.Driver => GHC.Core.Opt.Driver
* GHC.Core.Opt.Tidy => GHC.Core.Tidy
* GHC.Core.Opt.WorkWrap.Lib => GHC.Core.Opt.WorkWrap.Utils
As discussed in:
* https://mail.haskell.org/pipermail/ghc-devs/2020-April/018758.html
* https://gitlab.haskell.org/ghc/ghc/issues/13009#note_264650
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15312bbb53f247c9ed2c5cf75100a9f44c1c7227">15312bbb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-18T20:04:46+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules (#13009)
* SysTools
* Parser
* GHC.Builtin
* GHC.Iface.Recomp
* Settings
Update Haddock submodule
Metric Decrease:
Naperian
parsing001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eaed0a3289e4c24ff1a70c6fc4b7f8bae6cd2dd3">eaed0a32</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-19T03:16:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing addInScope call for letrec binders in OccurAnal
This fixes #18044, where a shadowed variable was incorrectly substituted
by the binder swap on the RHS of a floated-in letrec. This can only
happen when the uniques line up *just* right, so writing a regression
test would be very difficult, but at least the fix is small and
straightforward.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/36882493fcaa9dd2eefa7184929765189ac339ad">36882493</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2020-04-20T04:36:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Derive Ord instance for Extension
Metric Increase:
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b43365ad62d73afd5c58467ab9a4f9523ab09c18">b43365ad</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-20T04:37:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a buglet in redundant-constraint warnings
Ticket #18036 pointed out that we were reporting a redundant
constraint when it really really wasn't.
Turned out to be a buglet in the SkolemInfo for the
relevant implication constraint. Easily fixed!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d5fae7da02cff1c7ec7b8e472f85d23aef098968">d5fae7da</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-20T14:39:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark T12010 fragile on 32-bit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bca02fca0119354a6201fd5d019a553015ba2dd8">bca02fca</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-04-21T06:38:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: drop note about not supporting shared libraries on unix systems
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6655f93324b7f1d30a6baaedfecae455d5e08e39">6655f933</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use ParserFlags in GHC.Runtime.Eval (#17957)
Instead of passing `DynFlags` to functions such as `isStmt` and
`hasImport` in `GHC.Runtime.Eval` we pass `ParserFlags`. It's a much
simpler structure that can be created purely with `mkParserFlags'`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70be0fbcefa07ff164437476bf2809ea7c3ff495">70be0fbc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Runtime: avoid DynFlags (#17957)
* add `getPlatform :: TcM Platform` helper
* remove unused `DynFlags` parameter from `emptyPLS`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35e43d48a9a3ab22da90c4c2ea2c805fe762b9c5">35e43d48</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid DynFlags in Ppr code (#17957)
* replace `DynFlags` parameters with `SDocContext` parameters for a few
Ppr related functions: `bufLeftRenderSDoc`, `printSDoc`,
`printSDocLn`, `showSDocOneLine`.
* remove the use of `pprCols :: DynFlags -> Int` in Outputable. We
already have the information via `sdocLineLength :: SDocContext ->
Int`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce5c2999d2e356d034fbf1045a2383c0ac24f15f">ce5c2999</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid using sdocWithDynFlags (#17957)
Remove one use of `sdocWithDynFlags` from `GHC.CmmToLlvm.llvmCodeGen'`
and from `GHC.Driver.CodeOutput.profilingInitCode`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2a98996e7792f572ab685f29742e3476be81166">f2a98996</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid `sdocWithDynFlags` in `pprCLbl` (#17957)
* add a `DynFlags` parameter to `pprCLbl`
* put `maybe_underscore` and `pprAsmCLbl` in a `where` clause to avoid
`DynFlags` parameters
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/747093b7c23a1cf92b564eb3d9efe2adc15330df">747093b7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmToAsm DynFlags refactoring (#17957)
* Remove `DynFlags` parameter from `isDynLinkName`: `isDynLinkName` used
to test the global `ExternalDynamicRefs` flag. Now we test it outside of
`isDynLinkName`
* Add new fields into `NCGConfig`: current unit id, sse/bmi versions,
externalDynamicRefs, etc.
* Replace many uses of `DynFlags` by `NCGConfig`
* Moved `BMI/SSE` datatypes into `GHC.Platform`
</pre>
</li>
<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/cd8409c26d4370bf2cdcd76801974e99a9adf7b0">cd8409c2</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-23T11:39:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Create di_scoped_tvs for associated data family instances properly
See `Note [Associated data family instances and di_scoped_tvs]` in
`GHC.Tc.TyCl.Instance`, which explains all of the moving parts.
Fixes #18055.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/339e8ece1c844af5c9165efbc3a928890c2f75c7">339e8ece</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-23T11:40:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/ghci: Allow arguments to be passed to GHCi
Previously the arguments passed to hadrian/ghci were passed both to
`hadrian` and GHCi. This is rather odd given that there are essentially
not arguments in the intersection of the two. Let's just pass them to
GHCi; this allows `hadrian/ghci -Werror`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5946c85abcf66555cdbcd3eed02cb8f512b6110c">5946c85a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-23T11:40:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't attempt to read .std{err,out} files if they don't exist
Simon reports that he was previously seeing framework failures due to
an attempt to read the non-existing T13456.stderr. While I don't know
exactly what this is due to, it does seem like a non-existing
.std{out,err} file should be equivalent to an empty file. Teach the
testsuite driver to treat it as such.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c42754d5fdd3c2db554d9541bab22d1b3def4be7">c42754d5</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-23T18:32:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Trees That Grow refactor for `ConPat` and `CoPat`
- `ConPat{In,Out}` -> `ConPat`
- `CoPat` -> `XPat (CoPat ..)`
Note that `GHC.HS.*` still uses `HsWrap`, but only when `p ~ GhcTc`.
After this change, moving the type family instances out of `GHC.HS.*` is
sufficient to break the cycle.
Add XCollectPat class to decide how binders are collected from XXPat based on the pass.
Previously we did this with IsPass, but that doesn't work for Haddock's
DocNameI, and the constraint doesn't express what actual distinction is being
made. Perhaps a class for collecting binders more generally is in order, but we
haven't attempted this yet.
Pure refactor of code around ConPat
- InPat/OutPat synonyms removed
- rename several identifiers
- redundant constraints removed
- move extension field in ConPat to be first
- make ConPat use record syntax more consistently
Fix T6145 (ConPatIn became ConPat)
Add comments from SPJ.
Add comment about haddock's use of CollectPass.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72da0c29cd7c336cdce3b36d1dd9e8b65a53afbd">72da0c29</a></strong>
<div>
<span>by mniip</span>
<i>at 2020-04-23T18:33:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add :doc to GHC.Prim
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c23e2e37d6c937a425c53da643aec90bda01ef6">2c23e2e3</a></strong>
<div>
<span>by mniip</span>
<i>at 2020-04-23T18:33:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Include docs for non-primop entries in primops.txt as well
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ac29c885fba7ed69de83a597cdbd03696c9ed13">0ac29c88</a></strong>
<div>
<span>by mniip</span>
<i>at 2020-04-23T18:33:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Prim docs: note and test
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0fbfc7582fb81314dc28a056536737fb5eeaa6e">b0fbfc75</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-24T12:07:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch order on `GhcMake.IsBoot`
In !1798 we were requested to replace many `Bool`s with this data type.
But those bools had `False` meaning `NotBoot`, so the `Ord` instance
would be flipped if we use this data-type as-is.
Since the planned formally-`Bool` occurrences vastly outnumber the
current occurrences, we figured it would be better to conform the `Ord`
instance to how the `Bool` is used now, fixing any issues, rather than
fix them currently with the bigger refactor later in !1798. That way,
!1798 can be a "pure" refactor with no behavioral changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af332442123878c1b61d236dce46418efcbe8750">af332442</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-26T13:55:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Utils and Data (#13009)
Update Haddock submodule
Metric Increase:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd4434c8e77213bf3e6f83227fd8802c9f2a6fe2">cd4434c8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-26T13:55:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix misleading Ptr phantom type in SerializedCompact (#15653)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22bf5c738e0339fa12940414d6448896c6733808">22bf5c73</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-26T13:55:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tweak includes in non-moving GC headers
We don't use hash tables in non-moving GC so remove the includes.
This breaks Compact.c as existing includes no longer include Hash.h, so
include Hash.h explicitly in Compact.c.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99823ed24b22447b14202ca57f75550773c44dbe">99823ed2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-27T20:24:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TH: fix Show/Eq/Ord instances for Bytes (#16457)
We shouldn't compare pointer values but the actual bytes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c62271a21b1ba1d207aaebf370c87dd884fa6ae1">c62271a2</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-04-27T20:25:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: always capture both stdout and stderr when running a builder fails
The idea being that when a builder('s command) fails, we quite likely want to
have all the information available to figure out why. Depending on the builder
_and_ the particular problem, the useful bits of information can be printed
on stdout or stderr.
We accomplish this by defining a simple wrapper for Shake's `cmd` function,
that just _always_ captures both streams in case the command returns a non-zero
exit code, and by using this wrapper everywhere in `hadrian/src/Builder.hs`.
Fixes #18089.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b9764db7c190de377c06dfc71bfe6e4b37c7eb0">4b9764db</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-28T15:40:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define a Quote IO instance
Fixes #18103.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/518a63d4d7e31e49a81ad66d5e5ccb1f790f6de9">518a63d4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-28T15:40:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make boxed 1-tuples have known keys
Unlike other tuples, which use special syntax and are "known" by way
of a special `isBuiltInOcc_maybe` code path, boxed 1-tuples do not
use special syntax. Therefore, in order to make sure that the
internals of GHC are aware of the `data Unit a = Unit a` definition
in `GHC.Tuple`, we give `Unit` known keys. For the full details, see
`Note [One-tuples] (Wrinkle: Make boxed one-tuple names have known keys)`
in `GHC.Builtin.Types`.
Fixes #18097.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2cfc4ab9710c873a55e9a44aac9dacb06ecce36f">2cfc4ab9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document backpack fields in DynFlags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10a2ba90aa6a788677104cc43318c66f46e2e2b0">10a2ba90</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnitInfo
* Rename InstalledPackageInfo into GenericUnitInfo
The name InstalledPackageInfo is only kept for alleged backward
compatibility reason in Cabal. ghc-boot has its own stripped down copy
of this datatype but it doesn't need to keep the name. Internally we
already use type aliases (UnitInfo in GHC, PackageCacheFormat in
ghc-pkg).
* Rename UnitInfo fields: add "unit" prefix and fix misleading names
* Add comments on every UnitInfo field
* Rename SourcePackageId into PackageId
"Package" already indicates that it's a "source package". Installed
package components are called units.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69562e34fb5d9571e9efc1cb90c879e50129a510">69562e34</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused `emptyGenericUnitInfo`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e2c8e0e37a2709d5790d6c9a877a1463d6e88b5">9e2c8e0e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnitInfo load/store from databases
Converting between UnitInfo stored in package databases and UnitInfo as
they are used in ghc-pkg and ghc was done in a very convoluted way (via
BinaryStringRep and DbUnitModuleRep type classes using fun deps, etc.).
It was difficult to understand and even more to modify (I wanted to
try to use a GADT for UnitId but fun deps got in the way).
The new code uses much more straightforward functions to convert between
the different representations. Much simpler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea717aa4248b2122e1f7550f30239b50ab560e4f">ea717aa4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factorize mungePackagePaths code
This patch factorizes the duplicated code used in ghc-pkg and in GHC to
munge package paths/urls.
It also fixes haddock-html munging in GHC (allowed to be either a file
or a url) to mimic ghc-pkg behavior.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10d15f1ec4bab4dd6152d87fc66e61658a705eb3">10d15f1e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring unit management code
Over the years the unit management code has been modified a lot to keep
up with changes in Cabal (e.g. support for several library components in
the same package), to integrate BackPack, etc. I found it very hard to
understand as the terminology wasn't consistent, was referring to past
concepts, etc.
The terminology is now explained as clearly as I could in the Note
"About Units" and the code is refactored to reflect it.
-------------------
Many names were misleading: UnitId is not an Id but could be a virtual
unit (an indefinite one instantiated on the fly), IndefUnitId
constructor may contain a definite instantiated unit, etc.
* Rename IndefUnitId into InstantiatedUnit
* Rename IndefModule into InstantiatedModule
* Rename UnitId type into Unit
* Rename IndefiniteUnitId constructor into VirtUnit
* Rename DefiniteUnitId constructor into RealUnit
* Rename packageConfigId into mkUnit
* Rename getPackageDetails into unsafeGetUnitInfo
* Rename InstalledUnitId into UnitId
Remove references to misleading ComponentId: a ComponentId is just an
indefinite unit-id to be instantiated.
* Rename ComponentId into IndefUnitId
* Rename ComponentDetails into UnitPprInfo
* Fix display of UnitPprInfo with empty version: this is now used for
units dynamically generated by BackPack
Generalize several types (Module, Unit, etc.) so that they can be used
with different unit identifier types: UnitKey, UnitId, Unit, etc.
* GenModule: Module, InstantiatedModule and InstalledModule are now
instances of this type
* Generalize DefUnitId, IndefUnitId, Unit, InstantiatedUnit,
PackageDatabase
Replace BackPack fake "hole" UnitId by a proper HoleUnit constructor.
Add basic support for UnitKey. They should be used more in the future to
avoid mixing them up with UnitId as we do now.
Add many comments.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bfb0219587b969d5c8f723c46d433e9493958b4">8bfb0219</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Unit: split and rename modules
Introduce GHC.Unit.* hierarchy for everything concerning units, packages
and modules.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71484b09fa3c676e99785b3d68f69d4cfb14266e">71484b09</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow block arguments in arrow control operators
Arrow control operators have their own entries in the grammar, so they
did not cooperate with BlockArguments. This was just a minor oversight,
so this patch adjusts the grammar to add the desired behavior.
fixes #18050
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a48cd2a045695c5f34ed7b00184a8d91c4fcac0e">a48cd2a0</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow LambdaCase to be used as a command in proc notation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4d3773c7f4209cd3a0495ab9a29b978da48e2ff">f4d3773c</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document BlockArguments/LambdaCase support in arrow notation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5bdfdd139e5aff57631e9f1c6654dc7b8590c63f">5bdfdd13</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-30T01:58:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for #17873
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19b701c216246596710f0eba112ed5ee7b6bf870">19b701c2</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-30T07:30:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark rule args as non-tail-called
This was just an omission...b I'd failed to call markAllNonTailCall on
rule args. I think this bug has been here a long time, but it's quite
hard to trigger.
Fixes #18098
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/014ef4a3d9ee30b8add9118950f1f5007143bd1c">014ef4a3</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-04-30T07:30:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Improve tool-args command to support more components
There is a new command to hadrian, tool:path/to/file.hs, which returns
the options needed to compile that file in GHCi.
This is now used in the ghci script with argument `ghc/Main.hs` but its
main purpose is to support the new multi-component branch of ghcide.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2aa676114bca40d6124ba90d13242c7c102369e0">2aa67611</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Clear bitmap after initializing block size
Previously nonmovingInitSegment would clear the bitmap before
initializing the segment's block size. This is broken since
nonmovingClearBitmap looks at the segment's block size to determine how
much bitmap to clear.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54dad3cf1e04f16ea00fb6a41b378e948c8ebf0f">54dad3cf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Explicitly memoize block count
A profile cast doubt on whether the compiler hoisted the bound out the
loop as I would have expected here. It turns out it did but nevertheless
it seems clearer to just do this manually.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99ff8145044288a8a58c8028516903937ba3935c">99ff8145</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Eagerly flush all capabilities' update remembered sets
(cherry picked from commit 2fa79119570b358a4db61446396889b8260d7957)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05b0a9fd136869f71245e12fdae64d42dc2ee1df">05b0a9fd</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-30T21:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove OneShotInfo field of LFReEntrant, document OneShotInfo
The field is only used in withNewTickyCounterFun and it's easier to
directly pass a parameter for one-shot info to withNewTickyCounterFun
instead of passing it via LFReEntrant. This also makes !2842 simpler.
Other changes:
- New Note (by SPJ) [OneShotInfo overview] added.
- Arity argument of thunkCode removed as it's always 0.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a43620c621563deed76ba6b417e3a7a707c15d23">a43620c6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-30T21:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.StgToCmm.Ticky: remove a few unused stuff
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/780de9e11014a88a4f676eb296c30fec2b07b5c2">780de9e1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-01T10:37:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use platform in Iface Binary
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8386c7b6a9d26bc5fd2c1d74d944c8df6337690">f8386c7b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-01T10:37:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor PprDebug handling
If `-dppr-debug` is set, then PprUser and PprDump styles are silently
replaced with PprDebug style. This was done in `mkUserStyle` and
`mkDumpStyle` smart constructors. As a consequence they needed a
DynFlags parameter.
Now we keep the original PprUser and PprDump styles until they are used
to create an `SDocContext`. I.e. the substitution is only performed in
`initSDocContext`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3df9e780fb2f5658412c644849cd0f1e6f50331">b3df9e78</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-01T10:37:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove PprStyle param of logging actions
Use `withPprStyle` instead to apply a specific style to a SDoc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de9fc995c2170bc34600ee3fc80393c67cfecad1">de9fc995</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-01T10:37:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fully remove PprDebug
PprDebug was a pain to deal with consistently as it is implied by
`-dppr-debug` but it isn't really a PprStyle. We remove it completely
and query the appropriate SDoc flag instead (`sdocPprDebug`) via
helpers (`getPprDebug` and its friends).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b51fcbd67ca17a6dcc2f9e5a29176f836bf11d2">8b51fcbd</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-01T10:38:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Only call checkSingle if we would report warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1">fd7ea0fe</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-01T10:38:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Pick up `EvVar`s bound in `HsWrapper`s for long-distance info
`HsWrapper`s introduce evidence bindings through `WpEvLam` which the
pattern-match coverage checker should be made aware of.
Failing to do so caused #18049, where the resulting impreciseness of
imcompleteness warnings seemingly contradicted with
`-Winaccessible-code`.
The solution is simple: Collect all the evidence binders of an
`HsWrapper` and add it to the ambient `Deltas` before desugaring
the wrapped expression.
But that means we pick up many more evidence bindings, even when they
wrap around code without a single pattern match to check! That regressed
`T3064` by over 300%, so now we are adding long-distance info lazily
through judicious use of `unsafeInterleaveIO`.
Fixes #18049.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7bfe9ac514e18c0b0e24ff55230fe98ec9db894c">7bfe9ac5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-03T04:41:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Enable tracing of nonmoving heap census with -ln
Previously this was not easily available to the user. Fix this.
Non-moving collection lifecycle events are now reported with -lg.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c560dd07f506810eaabae2f582491138aa224819">c560dd07</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-03T04:41:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Move eventlog documentation users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02543d5ef9bd7a910fc9fece895780583ab9635a">02543d5e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-03T04:41:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Add documentation for non-moving GC events
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b465dd4500beffe919e8b8dcd075008399fbf446">b465dd45</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-05-03T04:42:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Flatten nested casts in the simple optimizer
Normally, we aren’t supposed to generated any nested casts, since mkCast
takes care to flatten them, but the simple optimizer didn’t use mkCast,
so they could show up after inlining. This isn’t really a problem, since
the simplifier will clean them up immediately anyway, but it can clutter
the -ddump-ds output, and it’s an extremely easy fix.
closes #18112
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bdc03d61cb7a2f96887c86bd0b253f7c108fcde">8bdc03d6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-05-04T01:56:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't return a panic in tcNestedSplice
In GHC.Tc.Gen.Splice.tcNestedSplice we were returning a
typechecked expression of "panic". That is usually OK, because
the result is discarded. But it happens that tcApp now looks at
the typechecked expression, trivially, to ask if it is tagToEnum.
So being bottom is bad.
Moreover a debug-trace might print it out.
So better to return a civilised expression, even though it is
usually discarded.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bf640b19d7a7ad0800152752a71c1dd4e6c696d">0bf640b1</a></strong>
<div>
<span>by Baldur Blöndal</span>
<i>at 2020-05-04T01:57:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't require parentheses around via type (`-XDerivingVia'). Fixes #18130".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30272412fa437ab8e7a8035db94a278e10513413">30272412</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-05-04T13:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove custom ExceptionMonad class (#18075) (updating haddock submodule accordingly)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9f7c08ff5aa71b7673c8136b897e6f29de01330">b9f7c08f</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-04T13:20:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused hs-boot file
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d8f80cd64edd1ea6a5d4c4aa2e09ad0d077ae1b">1d8f80cd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-05T03:22:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove references to -package-key
* remove references to `-package-key` which has been removed in 2016
(240ddd7c39536776e955e881d709bbb039b48513)
* remove support for `-this-package-key` which has been deprecated at the
same time
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7bc3a65b467c4286377b9bded277d5a2f69160b3">7bc3a65b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-05T03:23:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove SpecConstrAnnotation (#13681)
This has been deprecated since 2013. Use GHC.Types.SPEC instead.
Make GHC.Exts "not-home" for haddock
Metric Decrease:
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c862f635394b02c121f917a4d9ea7802033eebb">3c862f63</a></strong>
<div>
<span>by DenisFrezzato</span>
<i>at 2020-05-05T03:24:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Haskell98 short description in documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2420c555e6cb681f4ef7c4ae3192a850ab431759">2420c555</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-05T03:24:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression tests for #16244, #16245, #16758
Commit e3c374cc5bd7eb49649b9f507f9f7740697e3f70 ended up
fixing quite a few bugs:
* This commit fixes #16244 completely. A regression test has been
added.
* This commit fixes one program from #16245. (The program in
https://gitlab.haskell.org/ghc/ghc/issues/16245#note_211369 still
panics, and the program in
https://gitlab.haskell.org/ghc/ghc/issues/16245#note_211400 still
loops infinitely.) A regression test has been added for this
program.
* This commit fixes #16758. Accordingly, this patch removes the
`expect_broken` label from the `T16758` test case, moves it from
`should_compile` to `should_fail` (as it should produce an error
message), and checks in the expected stderr.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40c71c2cf38b4e134d81b7184a4d5e02949ae70c">40c71c2c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-05T03:25:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix colorized error messages (#18128)
In b3df9e780fb2f5658412c644849cd0f1e6f50331 I broke colorized messages
by using "dump" style instead of "user" style. This commits fixes it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ab6ab093c86227b6d33a5185ebbd11928ac9754">7ab6ab09</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-05-06T04:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor hole constraints.
Previously, holes (both expression holes / out of scope variables and
partial-type-signature wildcards) were emitted as *constraints* via
the CHoleCan constructor. While this worked fine for error reporting,
there was a fair amount of faff in keeping these constraints in line.
In particular, and unlike other constraints, we could never change
a CHoleCan to become CNonCanonical. In addition:
* the "predicate" of a CHoleCan constraint was really the type
of the hole, which is not a predicate at all
* type-level holes (partial type signature wildcards) carried
evidence, which was never used
* tcNormalise (used in the pattern-match checker) had to create
a hole constraint just to extract it again; it was quite messy
The new approach is to record holes directly in WantedConstraints.
It flows much more nicely now.
Along the way, I did some cleaning up of commentary in
GHC.Tc.Errors.Hole, which I had a hard time understanding.
This was instigated by a future patch that will refactor
the way predicates are handled. The fact that CHoleCan's
"predicate" wasn't really a predicate is incompatible with
that future patch.
No test case, because this is meant to be purely internal.
It turns out that this change improves the performance of
the pattern-match checker, likely because fewer constraints
are sloshing about in tcNormalise. I have not investigated
deeply, but an improvement is not a surprise here:
-------------------------
Metric Decrease:
PmSeriesG
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/420b957df9d831632a3edab682778b11734255f1">420b957d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-06T04:40:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Zero block flags with -DZ
Block flags are very useful for determining the state of a block.
However, some block allocator users don't touch them, leading to
misleading values. Ensure that we zero then when zero-on-gc is set. This
is safe and makes the flags more useful during debugging.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/740b3b8df76dabd88bdb3474aad2b287b0960f07">740b3b8d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-06T04:40:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix incorrect failed_to_evac value during deadlock gc
Previously we would incorrectly set the failed_to_evac flag if we
evacuated a value due to a deadlock GC. This would cause us to mark more
things as dirty than strictly necessary. It also turned up a nasty but
which I will fix next.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2d72c758233830446230800d0045badc01b42ca">b2d72c75</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-06T04:40:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix handling of dirty objects
Previously we (incorrectly) relied on failed_to_evac to be "precise".
That is, we expected it to only be true if *all* of an object's fields
lived outside of the non-moving heap. However, does not match the
behavior of failed_to_evac, which is true if *any* of the object's
fields weren't promoted (meaning that some others *may* live in the
non-moving heap).
This is problematic as we skip the non-moving write barrier for dirty
objects (which we can only safely do if *all* fields point outside of
the non-moving heap).
Clearly this arises due to a fundamental difference in the behavior
expected of failed_to_evac in the moving and non-moving collector.
e.g., in the moving collector it is always safe to conservatively say
failed_to_evac=true whereas in the non-moving collector the safe value
is false.
This issue went unnoticed as I never wrote down the dirtiness
invariant enforced by the non-moving collector. We now define this
invariant as
An object being marked as dirty implies that all of its fields are
on the mark queue (or, equivalently, update remembered set).
To maintain this invariant we teach nonmovingScavengeOne to push the
fields of objects which we fail to evacuate to the update remembered
set. This is a simple and reasonably cheap solution and avoids the
complexity and fragility that other, more strict alternative invariants
would require.
All of this is described in a new Note, Note [Dirty flags in the
non-moving collector] in NonMoving.c.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f3e6884e338015f2953c4c0844e04d467f53dd5">9f3e6884</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-05-06T04:41:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow atomic update of NameCache in readHieFile
The situation arises in ghcide where multiple different threads may need to
update the name cache, therefore with the older interface it could happen
that you start reading a hie file with name cache A and produce name cache
A + B, but another thread in the meantime updated the namecache to A +
C. Therefore if you write the new namecache you will lose the A' updates
from the second thread.
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293">edec6a6c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-06T04:41:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make isTauTy detect higher-rank contexts
Previously, `isTauTy` would only detect higher-rank `forall`s, not
higher-rank contexts, which led to some minor bugs observed
in #18127. Easily fixed by adding a case for
`(FunTy InvisArg _ _)`.
Fixes #18127.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a95e7fe02efd2fdeec91ba46de64bc78c81381eb">a95e7fe0</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-05-06T04:42:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ELF linker: increment curSymbol after filling in fields of current entry
The bug was introduced in a8b7cef4d45 which added a field to the
`symbols` array elements and then updated this code incorrectly:
- oc->symbols[curSymbol++] = nm;
+ oc->symbols[curSymbol++].name = nm;
+ oc->symbols[curSymbol].addr = symbol->addr;
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cab1871ab93feeacf2bf9a1c65b1c919ca9c5399">cab1871a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-06T04:43:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move LeadingUnderscore into Platform (#17957)
Avoid direct use of DynFlags to know if symbols must be prefixed by an
underscore.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/94e7c563ab24fe452a16900a6777349970df1945">94e7c563</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-06T04:43:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use DynFlags in showLinkerState (#17957)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9afd92512b41cf6c6de3a17b474d8d4bb01158c3">9afd9251</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-06T04:43:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring: Use bindSigTyVarsFV in rnMethodBinds
`rnMethodBinds` was explicitly using `xoptM` to determine if
`ScopedTypeVariables` is enabled before bringing type variables
bound by the class/instance header into scope. However, this `xoptM`
logic is already performed by the `bindSigTyVarsFV` function. This
patch uses `bindSigTyVarsFV` in `rnMethodBinds` to reduce the number
of places where we need to consult if `ScopedTypeVariables` is on.
This is purely refactoring, and there should be no user-visible
change in behavior.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6d72b2c382860a5f7a08779b2405da8473814c">6f6d72b2</a></strong>
<div>
<span>by Brian Foley</span>
<i>at 2020-05-08T15:29:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove further dead code found by a simple Python script.
Avoid removing some functions that are part of an API even
though they're not used in-tree at the moment.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78bf8bf967551f8667b766328504cfbd24df9bfb">78bf8bf9</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-05-08T15:29:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add doc examples for Bifoldable
See #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66f0a847255f15ec656a37d639556b7918f6aac2">66f0a847</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-05-08T15:29:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc (Bitraversable): Add examples to Bitraversable
* Add examples to Data.Bitraversable
* Fix formatting for (,) in Bitraversable and Bifoldable
* Fix mistake on bimapAccumR documentation
See #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9749fe1223d182b1f8e7e4f7378df661c509f396">9749fe12</a></strong>
<div>
<span>by Baldur Blöndal</span>
<i>at 2020-05-08T15:29:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Specify kind variables for inferred kinds in base.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e9aef9ea732e8157ee0b7fbb85b2cdfbf49de5f">4e9aef9e</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-08T15:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">HsSigWcTypeScoping: Pull in documentation from stray location
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4d5c6df56a28be5448acf43e4f45b1695ae9eb5">f4d5c6df</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-08T15:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename local `real_fvs` to `implicit_vs`
It doesn't make sense to call the "free" variables we are about to
implicitly bind the real ones.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20570b4b5e741912d1dc3f1826ee1f78e33f3b90">20570b4b</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-08T15:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A few tiny style nits with renaming
- Use case rather than guards that repeatedly scrutenize same thing.
- No need for view pattern when `L` is fine.
- Use type synnonym to convey the intent like elsewhere.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09ac8de5777d5ca953279a6c0ee42a6fba0fcba6">09ac8de5</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-08T15:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add `forAllOrNothing` function with note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb35c0e573b0bc8fe6a28c00734fa124da02a755">bb35c0e5</a></strong>
<div>
<span>by Joseph C. Sible</span>
<i>at 2020-05-08T15:29:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document lawlessness of Ap's Num instance</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdd229fff24ab19a41dd2af218108dd8c514fff7">cdd229ff</a></strong>
<div>
<span>by Joseph C. Sible</span>
<i>at 2020-05-08T15:29:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/Data/Monoid.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/926d2aab83dc6068cba76f71a19b040eddc6dee9">926d2aab</a></strong>
<div>
<span>by Joseph C. Sible</span>
<i>at 2020-05-08T15:29:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply more suggestions from Simon Jakobi</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a763cff78d2d4b23d05554e68138678cb4ba627">7a763cff</a></strong>
<div>
<span>by Adam Gundry</span>
<i>at 2020-05-08T15:29:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reject all duplicate declarations involving DuplicateRecordFields (fixes #17965)
This fixes a bug that resulted in some programs being accepted that used the same
identifier as a field label and another declaration, depending on the order they
appeared in the source code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88e3c8150d2b2d96c3ebc0b2942c9af44071c511">88e3c815</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-05-08T15:29:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix specialisation for DFuns
When specialising a DFun we must take care to saturate the
unfolding. See Note [Specialising DFuns] in Specialise.
Fixes #18120
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86c77b36628dcce7bc9b066fc24c8c521fecc3ee">86c77b36</a></strong>
<div>
<span>by Greg Steuck</span>
<i>at 2020-05-08T15:29:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused SEGMENT_PROT_RWX
It's been unused for a year and is problematic on any OS which
requires W^X for security.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9d97f4b5ddcfdf32b52734188f595d9a11fd4879">9d97f4b5</a></strong>
<div>
<span>by nineonine</span>
<i>at 2020-05-08T15:30:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #16167
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa318338b753ab6e9db44cf2c2d285827eb35a03">aa318338</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-08T15:30:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump exceptions submodule so that dist-boot is .gitignore'd
`exceptions` is a stage-0 boot library as of commit
30272412fa437ab8e7a8035db94a278e10513413, which means that building
`exceptions` in a GHC tree will generate a `dist-boot` directory.
However, this directory was not specified in `exceptions`'
`.gitignore` file, which causes it to dirty up the current `git`
working directory.
Accordingly, this bumps the `exceptions` submodule to commit
ghc/packages/exceptions@23c0b8a50d7592af37ca09beeec16b93080df98f,
which adds `dist-boot` to the `.gitignore` file.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea86360f21e8c9812acba8dc1bc2a54fef700ece">ea86360f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-05-08T15:30:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linker.c: initialize n_symbols of ObjectCode with other fields
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/951c1fb03d80094c8b0d9bcc463d86fa71695b3a">951c1fb0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-09T21:46:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix unboxed-sums GC ptr-slot rubbish value (#17791)
This patch allows boot libraries to use unboxed sums without implicitly
depending on `base` package because of `absentSumFieldError`.
See updated Note [aBSENT_SUM_FIELD_ERROR_ID] in GHC.Core.Make
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b352d63cbbfbee69358c198edd876fe7ef9d63ef">b352d63c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-09T21:47:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Make non-existent linker search path merely a warning
As noted in #18105, previously this resulted in a rather intrusive error
message. This is in contrast to the general expectation that search
paths are merely places to look, not places that must exist.
Fixes #18105.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf4f1e2f78840d25b132de55bce1e02256334ace">cf4f1e2f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T02:02:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/CNF: Fix fixup comparison function
Previously we would implicitly convert the difference between two words
to an int, resulting in an integer overflow on 64-bit machines.
Fixes #16992
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a03da9bfcf130bec616e0f77bbefbf62022753de">a03da9bf</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-05-13T02:03:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pack some of IdInfo fields into a bit field
This reduces residency of compiler quite a bit on some programs.
Example stats when building T10370:
Before:
2,871,242,832 bytes allocated in the heap
4,693,328,008 bytes copied during GC
33,941,448 bytes maximum residency (276 sample(s))
375,976 bytes maximum slop
83 MiB total memory in use (0 MB lost due to fragmentation)
After:
2,858,897,344 bytes allocated in the heap
4,629,255,440 bytes copied during GC
32,616,624 bytes maximum residency (278 sample(s))
314,400 bytes maximum slop
80 MiB total memory in use (0 MB lost due to fragmentation)
So -3.9% residency, -1.3% bytes copied and -0.4% allocations.
Fixes #17497
Metric Decrease:
T9233
T9675
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/670c3e5c84c5b638dc6277289db3cbbc39a03c36">670c3e5c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T02:03:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">get-win32-tarballs: Fix base URL
Revert a change previously made for testing purposes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ad8dc412f0b070df63e42e68468df08ac0f559a">8ad8dc41</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T02:03:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">get-win32-tarballs: Improve diagnostics output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8c0740b7c38184378aedefdca8fff35707c80de9">8c0740b7</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-05-13T02:04:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: Add examples for Data.Semigroup.Arg{Min,Max}
Context: #17153
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb22348fb92411c66f1a39fe2c34b167a9926bc7">cb22348f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T02:05:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add few cleanups of the CAF logic
Give the NameSet of non-CAFfy names a proper newtype to distinguish it
from all of the other NameSets floating about.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90e38b8139c10854280da56664c040120256bacc">90e38b81</a></strong>
<div>
<span>by Emeka Nkurumeh</span>
<i>at 2020-05-13T02:05:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix printf warning when using with ghc with clang on mingw</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86d8ac22608eb8f04ceaff65e76dbeec23b76753">86d8ac22</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-13T02:06:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CprAnal: Don't attach CPR sigs to expandable bindings (#18154)
Instead, look through expandable unfoldings in `cprTransform`.
See the new Note [CPR for expandable unfoldings]:
```
Long static data structures (whether top-level or not) like
xs = x1 : xs1
xs1 = x2 : xs2
xs2 = x3 : xs3
should not get CPR signatures, because they
* Never get WW'd, so their CPR signature should be irrelevant after analysis
(in fact the signature might even be harmful for that reason)
* Would need to be inlined/expanded to see their constructed product
* Recording CPR on them blows up interface file sizes and is redundant with
their unfolding. In case of Nested CPR, this blow-up can be quadratic!
But we can't just stop giving DataCon application bindings the CPR property,
for example
fac 0 = 1
fac n = n * fac (n-1)
fac certainly has the CPR property and should be WW'd! But FloatOut will
transform the first clause to
lvl = 1
fac 0 = lvl
If lvl doesn't have the CPR property, fac won't either. But lvl doesn't have a
CPR signature to extrapolate into a CPR transformer ('cprTransform'). So
instead we keep on cprAnal'ing through *expandable* unfoldings for these arity
0 bindings via 'cprExpandUnfolding_maybe'.
In practice, GHC generates a lot of (nested) TyCon and KindRep bindings, one
for each data declaration. It's wasteful to attach CPR signatures to each of
them (and intractable in case of Nested CPR).
```
Fixes #18154.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e34bf65613f0062ea902fb3d59623701b7cd01d5">e34bf656</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T02:07:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Add discussion of shared object naming
Fixes #18074.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5d0f244528f8f7ba3058a4cf7b075a474c63fa1b">5d0f2445</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T02:07:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Print sign of performance changes
Executes the minor formatting change in the tabulated performance
changes suggested in #18135.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e4b981ff7a0852c7bdc93039eed13582d923241">9e4b981f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T02:08:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add testcase for #18129
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/266310c300f2254dfdeb5eb2123737f765ed18f8">266310c3</a></strong>
<div>
<span>by Ivan-Yudin</span>
<i>at 2020-05-13T02:09:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc: Reformulate the opening paragraph of Ch. 4 in User's guide
Removes mentioning of Hugs
(it is not helpful for new users anymore).
Changes the wording for the rest of the paragraph.
Fixes #18132.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55e35c0b7e0f4b907dc21d42827b1cea4317226e">55e35c0b</a></strong>
<div>
<span>by Baldur Blöndal</span>
<i>at 2020-05-13T20:02:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Predicate, Equivalence derive via `.. -> a -> All'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7e0b57fda289e2715e7be86d4871503e3c09ee8">d7e0b57f</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-05-13T20:03:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: add a --freeze2 option to freeze stage 1 and 2
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d880d6b2e48268f5ed4d3eb751fe24cc833e9221">d880d6b2</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-05-13T20:04:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't reload environment files on every setSessionDynFlags
Makes `interpretPackageEnv` (which loads envirinment files) a part of
`parseDynamicFlags` (parsing command-line arguments, which is typically
done once) instead of `setSessionDynFlags` (which is typically called
several times). Making several (transitive) calls to `interpretPackageEnv`,
as before, caused #18125 #16318, which should be fixed now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190">102cfd67</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-13T20:04:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factor out HsPatSigType for pat sigs/RULE term sigs (#16762)
This implements chunks (2) and (3) of
https://gitlab.haskell.org/ghc/ghc/issues/16762#note_270170. Namely,
it introduces a dedicated `HsPatSigType` AST type, which represents
the types that can appear in pattern signatures and term-level `RULE`
binders. Previously, these were represented with `LHsSigWcType`.
Although `LHsSigWcType` is isomorphic to `HsPatSigType`, the intended
semantics of the two types are slightly different, as evidenced by
the fact that they have different code paths in the renamer and
typechecker.
See also the new `Note [Pattern signature binders and scoping]` in
`GHC.Hs.Types`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b17574f74173d0fa83b0def070dcba51b710be2e">b17574f7</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-05-13T20:05:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix(documentation): Fix the RST links to GHC.Prim
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df021fb15bcef313f30e772997bcb263c8f34078">df021fb1</a></strong>
<div>
<span>by Baldur Blöndal</span>
<i>at 2020-05-13T20:06:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document (->) using inferred quantification for its runtime representations.
Fixes #18142.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a93ea57355d521b92daf4e3120de88a1f94deee">1a93ea57</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-05-13T20:06:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tweak man page for ghc command
This commit updates the ghc command's man page as followings:
* Enable `man_show_urls` to show URL addresses in the `DESCRIPTION`
section of ghc.rst, because sphinx currently removes hyperlinks
for man pages.
* Add a `SEE ALSO` section to point to the GHC homepage
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a951e1bab3dfd3e9de31b0d8bf5699a9216b181d">a951e1ba</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-05-13T20:07:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHCi: Add link to the user's guide in help message
This commit adds a link to the user's guide in ghci's
`:help` message.
Newcomers could easily reach to details of ghci.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/404581eaa3bf8d3f100da7610a6a38158bea17c4">404581ea</a></strong>
<div>
<span>by Jeff Happily</span>
<i>at 2020-05-13T20:08:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle single unused import
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c999e5d4e63e7b407b174f51913cfa38e2dec46">1c999e5d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T20:09:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ensure that printMinimalImports closes handle
Fixes #18166.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9f5a8f4653c4696a1fbb768bd0d8f672d4c7d5f">c9f5a8f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-13T20:09:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Tell testsuite driver about LLVM availability
This reflects the logic present in the Make build system into Hadrian.
Fixes #18167.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c05c06596bd1b2852454af6243fc15ee852d2f45">c05c0659</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-05-14T03:31:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve some folds over Uniq[D]FM
* Replace some non-deterministic lazy folds with
strict folds.
* Replace some O(n log n) folds in deterministic order
with O(n) non-deterministic folds.
* Replace some folds with set-operations on the underlying
IntMaps.
This reduces max residency when compiling
`nofib/spectral/simple/Main.hs` with -O0 by about 1%.
Maximum residency when compiling Cabal also seems reduced on the
order of 3-9%.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/477f13bb4c5c2ba969d2c90890c51d7de01c5312">477f13bb</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-05-14T03:31:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Data.IntMap.disjoint
Data.IntMap gained a dedicated `disjoint` function in containers-0.6.2.1.
This patch applies this function where appropriate in hopes of modest
compiler performance improvements.
Closes #16806.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9c0110ce9e753360d7e6523114109b7616f2f08">e9c0110c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-14T12:25:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">IdInfo: Add reference to bitfield-packing ticket
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9bd20e83ff9b65bd5496fbb29d27072c9e4e84b9">9bd20e83</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-15T10:42:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: Improve handling of precise exceptions
This patch does two things: Fix possible unsoundness in what was called
the "IO hack" and implement part 2.1 of the "fixing precise exceptions"
plan in
https://gitlab.haskell.org/ghc/ghc/wikis/fixing-precise-exceptions,
which, in combination with !2956, supersedes !3014 and !2525.
**IO hack**
The "IO hack" (which is a fallback to preserve precise exceptions
semantics and thus soundness, rather than some smart thing that
increases precision) is called `exprMayThrowPreciseException` now.
I came up with two testcases exemplifying possible unsoundness (if
twisted enough) in the old approach:
- `T13380d`: Demonstrating unsoundness of the "IO hack" when resorting
to manual state token threading and direct use of primops.
More details below.
- `T13380e`: Demonstrating unsoundness of the "IO hack" when we have
Nested CPR. Not currently relevant, as we don't have Nested
CPR yet.
- `T13380f`: Demonstrating unsoundness of the "IO hack" for safe FFI
calls.
Basically, the IO hack assumed that precise exceptions can only be
thrown from a case scrutinee of type `(# State# RealWorld, _ #)`. I
couldn't come up with a program using the `IO` abstraction that violates
this assumption. But it's easy to do so via manual state token threading
and direct use of primops, see `T13380d`. Also similar code might be
generated by Nested CPR in the (hopefully not too) distant future, see
`T13380e`. Hence, we now have a more careful test in `forcesRealWorld`
that passes `T13380{d,e}` (and will hopefully be robust to Nested CPR).
**Precise exceptions**
In #13380 and #17676 we saw that we didn't preserve precise exception
semantics in demand analysis. We fixed that with minimal changes in
!2956, but that was terribly unprincipled.
That unprincipledness resulted in a loss of precision, which is tracked
by these new test cases:
- `T13380b`: Regression in dead code elimination, because !2956 was too
syntactic about `raiseIO#`
- `T13380c`: No need to apply the "IO hack" when the IO action may not
throw a precise exception (and the existing IO hack doesn't
detect that)
Fixing both issues in !3014 turned out to be too complicated and had
the potential to regress in the future. Hence we decided to only fix
`T13380b` and augment the `Divergence` lattice with a new middle-layer
element, `ExnOrDiv`, which means either `Diverges` (, throws an
imprecise exception) or throws a *precise* exception.
See the wiki page on Step 2.1 for more implementational details:
https://gitlab.haskell.org/ghc/ghc/wikis/fixing-precise-exceptions#dead-code-elimination-for-raiseio-with-isdeadenddiv-introducing-exnordiv-step-21
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/568d7279a80cf945271f0659f11a94eea3f1433d">568d7279</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-15T10:42:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Cmm.Opt: Handle MO_XX_Conv
This MachOp was introduced by 2c959a1894311e59cd2fd469c1967491c1e488f3
but a wildcard match in cmmMachOpFoldM hid the fact that it wasn't
handled. Ideally we would eliminate the match but this appears to be a
larger task.
Fixes #18141.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5bcf86063c0e5b6ee0d162ea64c88fdaad89e620">5bcf8606</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-17T08:46:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove duplicate Note [When to print foralls] in GHC.Core.TyCo.Ppr
There are two different Notes named `[When to print foralls]`. The
most up-to-date one is in `GHC.Iface.Type`, but there is a second
one in `GHC.Core.TyCo.Ppr`. The latter is less up-to-date, as it was
written before GHC switched over to using ifaces to pretty-print
types. I decided to just remove the latter and replace it with a
reference to the former.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55f0e783d234af103cf4e1d51cd31c99961c5abe">55f0e783</a></strong>
<div>
<span>by Fumiaki Kinoshita</span>
<i>at 2020-05-21T12:10:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Add Generic instances to various datatypes under GHC.*
* GHC.Fingerprint.Types: Fingerprint
* GHC.RTS.Flags: GiveGCStats, GCFlags, ConcFlags, DebugFlags, CCFlags, DoHeapProfile, ProfFlags, DoTrace, TraceFlags, TickyFlags, ParFlags and RTSFlags
* GHC.Stats: RTSStats and GCStats
* GHC.ByteOrder: ByteOrder
* GHC.Unicode: GeneralCategory
* GHC.Stack.Types: SrcLoc
Metric Increase:
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9311cd53d33439e8fe79967ba5fb85bcd114fec">a9311cd5</a></strong>
<div>
<span>by Gert-Jan Bottu</span>
<i>at 2020-05-21T12:11:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Explicit Specificity
Implementation for Ticket #16393.
Explicit specificity allows users to manually create inferred type variables,
by marking them with braces.
This way, the user determines which variables can be instantiated through
visible type application.
The additional syntax is included in the parser, allowing users to write
braces in type variable binders (type signatures, data constructors etc).
This information is passed along through the renamer and verified in the
type checker.
The AST for type variable binders, data constructors, pattern synonyms,
partial signatures and Template Haskell has been updated to include the
specificity of type variables.
Minor notes:
- Bumps haddock submodule
- Disables pattern match checking in GHC.Iface.Type with GHC 8.8
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/24e61aad37355fa3a5503b11a60ab7b314a3f405">24e61aad</a></strong>
<div>
<span>by Ben Price</span>
<i>at 2020-05-21T12:12:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Lint should say when it is checking a rule
It is rather confusing that when lint finds an error in a rule attached
to a binder, it reports the error as in the RHS, not the rule:
...
In the RHS of foo
We add a clarifying line:
...
In the RHS of foo
In a rule attached to foo
The implication that the rule lives inside the RHS is a bit odd, but
this niggle is already present for unfoldings, whose pattern we are
following.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78c6523c5106fc56b653fc14fda5741913da8fdc">78c6523c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-21T12:13:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Optimise the write barrier
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13f6c9d0376214b22d4cd16bd3a8cd7b8d864990">13f6c9d0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-21T12:13:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor linear reg alloc to remember past assignments.
When assigning registers we now first try registers we
assigned to in the past, instead of picking the "first"
one.
This is in extremely helpful when dealing with loops for
which variables are dead for part of the loop.
This is important for patterns like this:
foo = arg1
loop:
use(foo)
...
foo = getVal()
goto loop;
There we:
* assign foo to the register of arg1.
* use foo, it's dead after this use as it's overwritten after.
* do other things.
* look for a register to put foo in.
If we pick an arbitrary one it might differ from the register the
start of the loop expect's foo to be in.
To fix this we simply look for past register assignments for
the given variable. If we find one and the register is free we
use that register.
This reduces the need for fixup blocks which match the register
assignment between blocks. In the example above between the end
and the head of the loop.
This patch also moves branch weight estimation ahead of register
allocation and adds a flag to control it (cmm-static-pred).
* It means the linear allocator is more likely to assign the hotter
code paths first.
* If it assign these first we are:
+ Less likely to spill on the hot path.
+ Less likely to introduce fixup blocks on the hot path.
These two measure combined are surprisingly effective. Based on nofib
we get in the mean:
* -0.9% instructions executed
* -0.1% reads/writes
* -0.2% code size.
* -0.1% compiler allocations.
* -0.9% compile time.
* -0.8% runtime.
Most of the benefits are simply a result of removing redundant moves
and spills.
Reduced compiler allocations likely are the result of less code being
generated. (The added lookup is mostly non-allocating).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edc2cc588add3f23b3650f15d3f495943f2c06f9">edc2cc58</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-21T12:14:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NCG: Codelayout: Distinguish conditional and other branches.
In #18053 we ended up with a suboptimal code layout because
the code layout algorithm didn't distinguish between conditional
and unconditional control flow.
We can completely eliminate unconditional control flow instructions
by placing blocks next to each other, not so much for conditionals.
In terms of implementation we simply give conditional branches less
weight before computing the layout.
Fixes #18053
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7a6b2f4c690a9711339462114a538a85dcb7d83">b7a6b2f4</a></strong>
<div>
<span>by Gleb Popov</span>
<i>at 2020-05-21T12:15:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Set locale to C.UTF-8.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8c27cf6eef51adfa6ac9931d4f620645dc24dd3">a8c27cf6</a></strong>
<div>
<span>by Stefan Holdermans</span>
<i>at 2020-05-21T12:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow spaces in GHCi :script file names
This patch updates the user interface of GHCi so that file names passed
to the ':script' command may contain spaces escaped with a backslash.
For example:
:script foo\ bar.script
The implementation uses a modified version of 'words' that does not
break on escaped spaces.
Fixes #18027.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82663959d2f1ddbb514a652593bc8064fd69d6aa">82663959</a></strong>
<div>
<span>by Stefan Holdermans</span>
<i>at 2020-05-21T12:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add extra tests for GHCi :script syntax checks
The syntax for GHCi's ":script" command allows for only a single file
name to be passed as an argument. This patch adds a test for the cases
in which a file name is missing or multiple file names are passed.
Related to #T18027.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0b79e1b16887371d5cd14d53a607772ca730fb5">a0b79e1b</a></strong>
<div>
<span>by Stefan Holdermans</span>
<i>at 2020-05-21T12:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow GHCi :script file names in double quotes
This patch updates the user interface of GHCi so that file names passed
to the ':script' command can be wrapped in double quotes.
For example:
:script "foo bar.script"
The implementation uses a modified version of 'words' that treats
character sequences enclosed in double quotes as single words.
Fixes #18027.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf5663300c3d8b8b3c7dc2cd0dce2c923ec68987">cf566330</a></strong>
<div>
<span>by Stefan Holdermans</span>
<i>at 2020-05-21T12:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update documentation for GHCi :script
This patch adds the fixes that allow for file names containing spaces to
be passed to GHCi's ':script' command to the release notes for 8.12 and
expands the user-guide documentation for ':script' by mentioning how
such file names can be passed.
Related to #18027.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0004ccb885e534c386ceae21580fc59ec7ad0ede">0004ccb8</a></strong>
<div>
<span>by Tuan Le</span>
<i>at 2020-05-21T12:16:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Consider Relocatable read-only data as not constantReferences: #18137
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/964d3ea21e734a4b2ad3ab97955274a003242121">964d3ea2</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use `Checker` for `tc_pat`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b797aa420b65c8ee214a4fc94813d0d597352bb4">b797aa42</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use `Checker` for `tc_lpat` and `tc_lpats`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5108e84abb102920ab28e3aeb083ab6e483eb2f6">5108e84a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More judiciously panic in `ts_pat`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/510e04515bb3eaed95d374d685b5322ad7e6389d">510e0451</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put `PatEnv` first in `GHC.Tc.Gen.Pat.Checker`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb4231db322f4a2bb146c456852df6cdf1498dca">cb4231db</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tiny cleaup eta-reduce away a function argument
In GHC, not in the code being compiled!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6890c38d4568ca444cccc47dd1a86c5e020c3521">6890c38d</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-21T12:17:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use braces with do in `SplicePat` case for consistency
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3451584f98d4a6b26dba4079b9a703e70a49a3ab">3451584f</a></strong>
<div>
<span>by buggymcbugfix</span>
<i>at 2020-05-21T12:18:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix spelling mistakes and typos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b552e53136abfd6d728563338df99bf899d16139">b552e531</a></strong>
<div>
<span>by buggymcbugfix</span>
<i>at 2020-05-21T12:18:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add INLINABLE pragmas to Enum list producers
The INLINABLE pragmas ensure that we export stable (unoptimised) unfoldings in
the interface file so we can do list fusion at usage sites.
Related tickets: #15185, #8763, #18178.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e748006355d85fcddd17ba206873b0051219abb1">e7480063</a></strong>
<div>
<span>by buggymcbugfix</span>
<i>at 2020-05-21T12:18:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Piggyback on Enum Word methods for Word64
If we are on a 64 bit platform, we can use the efficient Enum Word
methods for the Enum Word64 instance.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/892b0c41816fca4eeea42ca03a43aac473311837">892b0c41</a></strong>
<div>
<span>by buggymcbugfix</span>
<i>at 2020-05-21T12:18:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document INLINE(ABLE) pragmas that enable fusion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b363ebb988cbf8c92df24eef5366293a80ecb19">2b363ebb</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-05-21T12:18:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">MR template should ask for key part</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a95bbd0bdf06d7d61b0bef6de77b59ca31b2c32d">a95bbd0b</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-21T12:19:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `Int`'s `mod` and `rem` strict in their first arguments
They used to be strict until 4d2ac2d (9 years ago).
It's obviously better to be strict for performance reasons.
It also blocks #18067.
NoFib results:
```
--------------------------------------------------------------------------------
Program Allocs Instrs
--------------------------------------------------------------------------------
integer -1.1% +0.4%
wheel-sieve2 +21.2% +20.7%
--------------------------------------------------------------------------------
Min -1.1% -0.0%
Max +21.2% +20.7%
Geometric Mean +0.2% +0.2%
```
The regression in `wheel-sieve2` is due to reboxing that likely will go
away with the resolution of #18067. See !3282 for details.
Fixes #18187.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3d055b8d10a549e42d18ae4859bc902f939f534">d3d055b8</a></strong>
<div>
<span>by Galen Huntington</span>
<i>at 2020-05-21T12:20:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify pitfalls of NegativeLiterals; see #18022.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b508a9e14c7c894ff4f080f099f3947813f41ec">1b508a9e</a></strong>
<div>
<span>by Alexey Kuleshevich</span>
<i>at 2020-05-21T12:21:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix wording in primops documentation to reflect the correct reasoning:
* Besides resizing functions, shrinking ones also mutate the
size of a mutable array and because of those two `sizeofMutabeByteArray`
and `sizeofSmallMutableArray` are now deprecated
* Change reference in documentation to the newer functions `getSizeof*`
instead of `sizeof*` for shrinking functions
* Fix incorrect mention of "byte" instead of "small"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4ca0c8a17b9d3a7e8ff8a93cc9e83be5173f8e14">4ca0c8a1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-21T12:21:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't variable-length encode magic iface constant.
We changed to use variable length encodings for many types by default,
including Word32. This makes sense for numbers but not when Word32 is
meant to represent four bytes.
I added a FixedLengthEncoding newtype to Binary who's instances
interpret their argument as a collection of bytes instead of a number.
We then use this when writing/reading magic numbers to the iface file.
I also took the libery to remove the dummy iface field.
This fixes #18180.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a127508137ba69d2fe1e563d2bbb9fdd9120ae85">a1275081</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-05-21T12:22:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a regression test for #11506
The testcase works now.
See explanation in https://gitlab.haskell.org/ghc/ghc/issues/11506#note_273202
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a816e5fbe02c476f51ec92563cad8247ffc90ba">8a816e5f</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-05-21T12:23:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Sort deterministically metric output
Previously, we sorted according to the test name and way,
but the metrics (max_bytes_used/peak_megabytes_allocated etc.)
were appearing in nondeterministic order.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/566cc73f46d67e2b36fda95d0253067bb0ecc12f">566cc73f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-21T12:24:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move isDynLinkName into GHC.Types.Name
It doesn't belong into GHC.Unit.State
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d830bbc9921bcc59164a0a18f0e0874ae4ce226e">d830bbc9</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-05-23T13:36:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: fix formatting and add some links
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded">49301ad6</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2020-05-23T13:37:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement cstringLength# and FinalPtr
This function and its accompanying rule resolve issue #5218.
A future PR to the bytestring library will make the internal
Data.ByteString.Internal.unsafePackAddress compute string length
with cstringLength#. This will improve the status quo because it is
eligible for constant folding.
Additionally, introduce a new data constructor to ForeignPtrContents
named FinalPtr. This additional data constructor, when used in the
IsString instance for ByteString, leads to more Core-to-Core
optimization opportunities, fewer runtime allocations, and smaller
binaries.
Also, this commit re-exports all the functions from GHC.CString
(including cstringLength#) in GHC.Exts. It also adds a new test
driver. This test driver is used to perform substring matches on Core
that is dumped after all the simplifier passes. In this commit, it is
used to check that constant folding of cstringLength# works.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcd6bdcce57430d08b335014625722c487ea08e4">dcd6bdcc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:37:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">simplCore: Ignore ticks in rule templates
This fixes #17619, where a tick snuck in to the template of a rule,
resulting in a panic during rule matching. The tick in question was
introduced via post-inlining, as discussed in `Note [Simplifying
rules]`. The solution we decided upon was to simply ignore ticks in the
rule template, as discussed in `Note [Tick annotations in RULE
matching]`.
Fixes #18162.
Fixes #17619.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82cb8913b38d44ef20e928ff8b08f3f0770ebf80">82cb8913</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-23T13:38:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18145 and also avoid needless work with implicit vars
- `forAllOrNothing` now is monadic, so we can trace whether we bind
an explicit `forall` or not.
- #18145 arose because the free vars calculation was needlessly
complex. It is now greatly simplified.
- Replaced some other implicit var code with `filterFreeVarsToBind`.
Co-authored-by: Ryan Scott <ryan.gl.scott@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a60dc83552c38af9bbc159bd4e092531196db9c0">a60dc835</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:39:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Fixes #17926.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/856adf54ab50fc3be66d17a0b94ba3074453b279">856adf54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:40:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Clarify meaning of -haddock flag
Fixes #18206.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ae57afd7abee9dec1050d9feace254ac04800bc">7ae57afd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">git: Add ignored commits file
This can be used to tell git to ignore bulk renaming commits like the
recently-finished module hierarchy refactoring. Configured with,
git config blame.ignoreRevsFile .git-ignore-revs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63d30e60b9ab76ed48fa9539957e7b29a2a8c611">63d30e60</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add hie-bios script for windows systems
It is a direct translation of the sh script
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59182b88aaa72d346b480b6aa14a9244915e1189">59182b88</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Honour previous values for CABAL and CABFLAGS
The immediate goal is let the hie-bios.bat script
set CABFLAGS with `-v0` and remove all cabal output
except the compiler arguments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/932dc54e13a8e2f60ea90af98682cc1011b9533e">932dc54e</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add specific configuration for windows in hie.yaml
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0eda0707d6cc3d5a85cfb13543df61623e82070">e0eda070</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove not needed hie-bios output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0ea59d641d400543e9e803007500da01eedf48a">a0ea59d6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Config module into GHC.Settings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37430251c3f684c46e893552dba78653d80e5243">37430251</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.Core.Arity into GHC.Core.Opt.Arity
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a426abb9b41de6097e888b9fdca7b275306b17c9">a426abb9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.Hs.Types into GHC.Hs.Type
See discussion in https://gitlab.haskell.org/ghc/ghc/issues/13009#note_268610
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c91a7a095331d8c776f6ecd74803026e0104502">1c91a7a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66bd24d197251b9907cbffba3d5d8a3f5e3c2e80">66bd24d1</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-24T01:56:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add orderingTyCon to wiredInTyCons (#18185)
`Ordering` needs to be wired in for use in the built-in `CmpNat` and
`CmpSymbol` type families, but somehow it was never added to the list
of `wiredInTyCons`, leading to the various oddities observed
in #18185. Easily fixed by moving `orderingTyCon` from
`basicKnownKeyNames` to `wiredInTyCons`.
Fixes #18185.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c43634d443bd3cc0b95b43a7180e12230b845d">01c43634</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-05-24T01:56:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused hs-boot file
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a07aa718110071ee30eebadf0b4b372e8e7fc8e">7a07aa71</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix cross-compiler build (#16051)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ccca16e2ecdde0a4e646c6d7515e00a7f364d3">15ccca16</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix distDir per stage
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b420fb2474650e6dfbd66afd199f28492f900f75">b420fb24</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix hp2ps error during cross-compilation
Fixed by @alp (see https://gitlab.haskell.org/ghc/ghc/issues/16051#note_274265)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd339ef0e8ce940902df79ed1d93b3af50ea6f77">cd339ef0</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-05-24T15:22:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Unicode brackets opening/closing tokens (#18225)
The tokens `[|`, `|]`, `(|`, and `|)` are opening/closing tokens as
described in GHC Proposal #229. This commit makes the unicode
variants (`⟦`, `⟧`, `⦇`, and `⦈`) act the same as their ASCII
counterparts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/013d71204be44d660f01f8eb255db2d48b832421">013d7120</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Specify kind variables for inferred kinds in base."
As noted in !3132, this has rather severe knock-on consequences in
user-code. We'll need to revisit this before merging something along
these lines.
This reverts commit 9749fe1223d182b1f8e7e4f7378df661c509f396.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c4312edd988b8aeeb65e095056743c30678df15">4c4312ed</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Drop redundant ad-hoc boot module check
To determine whether the module is a boot module
Coverage.addTicksToBinds was checking for a `boot` suffix in the module
source filename. This is quite ad-hoc and shouldn't be necessary; the
callsite in `deSugar` already checks that the module isn't a boot
module.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1abf3c844821c98dad7f6f5b23cc3f7889dce64c">1abf3c84</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Make tickBoxCount strict
This could otherwise easily cause a leak of (+) thunks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b28137505a2fc3a15f2c0ba31c39c1869ce65cdc">b2813750</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Make ccIndices strict
This just seems like a good idea.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02e278eb2ace60cf2acadd2f632b51b9017d5b56">02e278eb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Don't produce ModBreaks if not HscInterpreted
emptyModBreaks contains a bottom and consequently it's important that we
don't use it unless necessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8c014ce27c279e0d506d5391a4e9bfa7f1c31f2">b8c014ce</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-25T09:48:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coverage: Factor out addMixEntry
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53814a6424240ab50201fdde81a6e7832c1aad3d">53814a64</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-05-26T03:03:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add info about typeclass evidence to .hie files
See `testsuite/tests/hiefile/should_run/HieQueries.hs` and
`testsuite/tests/hiefile/should_run/HieQueries.stdout` for an example of this
We add two new fields, `EvidenceVarBind` and `EvidenceVarUse` to the
`ContextInfo` associated with an Identifier. These are associated with the
appropriate identifiers for the evidence variables collected when we come across
`HsWrappers`, `TcEvBinds` and `IPBinds` while traversing the AST.
Instance dictionary and superclass selector dictionaries from `tcg_insts` and
classes defined in `tcg_tcs` are also recorded in the AST as originating from
their definition span
This allows us to save a complete picture of the evidence constructed by the
constraint solver, and will let us report this to the user, enabling features
like going to the instance definition from the invocation of a class method(or
any other method taking a constraint) and finding all usages of a particular
instance.
Additionally,
- Mark NodeInfo with an origin so we can differentiate between bindings
origininating in the source vs those in ghc
- Along with typeclass evidence info, also include information on Implicit
Parameters
- Add a few utility functions to HieUtils in order to query the new info
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6604906c8cfa37f5780a6d5c40506b751b1740db">6604906c</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-26T03:04:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make WorkWrap.Lib.isWorkerSmallEnough aware of the old arity
We should allow a wrapper with up to 82 parameters when the original
function had 82 parameters to begin with.
I verified that this made no difference on NoFib, but then again
it doesn't use huge records...
Fixes #18122.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf772f19c06944f0fd03b4bdcd4a49e437084ba5">cf772f19</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-26T03:04:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enhance Note [About units] for Backpack
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ede241268171e8eee1e750d88ff356ddbfc357f2">ede24126</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-05-27T00:13:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">core-spec: Modify file paths according to new module hierarchy
This patch updates file paths according to new module hierarchy [1]:
* GHC/Core.hs <= coreSyn/CoreSyn.hs
* GHC/Core/Coercion.hs <= types/Coercion.hs
* GHC/Core/Coercion/Axiom.hs <= types/CoAxiom.hs
* GHC/Core/Coercion/Opt.hs <= types/OptCoercion.hs
* GHC/Core/DataCon.hs <= basicTypes/DataCon.hs
* GHC/Core/FamInstEnv.hs <= types/FamInstEnv.hs
* GHC/Core/Lint.hs <= coreSyn/CoreLint.hs
* GHC/Core/Subst.hs <= coreSyn/CoreSubst.hs
* GHC/Core/TyCo/Rep.hs <= types/TyCoRep.hs
* GHC/Core/TyCon.hs <= types/TyCon.hs
* GHC/Core/Type.hs <= types/Type.hs
* GHC/Core/Unify.hs <= types/Unify.hs
* GHC/Types/Literal.hs <= basicTypes/Literal.hs
* GHC/Types/Var.hs <= basicTypes/Var.hs
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04750304deae2128a8350e28224e1f62ae949820">04750304</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-27T00:14:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">eventlog: Fix racy flushing
Previously no attempt was made to avoid multiple threads writing their
capability-local eventlog buffers to the eventlog writer simultaneously.
This could result in multiple eventlog streams being interleaved. Fix
this by documenting that the EventLogWriter's write() and flush()
functions may be called reentrantly and fix the default writer to
protect its FILE* by a mutex.
Fixes #18210.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6203f24cf421749616a247c047a9b44192f963a">d6203f24</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-05-27T00:15:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `identifier` parse unparenthesized `->` (#18060)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28deee2872d2501a781ae5b89f1db3dbf796ee74">28deee28</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:23:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Core.Unfold: Refactor traceInline
This reduces duplication as well as fixes a bug wherein -dinlining-check
would override -ddump-inlinings. Moreover, the new variant
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f393e1e0a2998fe67cfd06501e35f495758b98f">1f393e1e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:23:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid unnecessary allocations due to tracing utilities
While ticky-profiling the typechecker I noticed that hundreds of
millions of SDocs are being allocated just in case -ddump-*-trace is
enabled. This is awful.
We avoid this by ensuring that the dump flag check is inlined into the
call site, ensuring that the tracing document needn't be allocated
unless it's actually needed.
See Note [INLINE conditional tracing utilities] for details.
Fixes #18168.
Metric Decrease:
T9961
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f621a78217237a4bdfb299b68827da6cc8f357e">5f621a78</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-05-28T16:23:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Semigroup/Monoid for Q (#18123)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc5f004c4dc27d78d3415adc54e9b6694b865145">dc5f004c</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-05-28T16:24:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18071
Run the core linter on candidate instances to ensure they are
well-kinded.
Better handle quantified constraints by using a CtWanted to avoid
having unsolved constraints thrown away at the end by the solver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10e6982c6117e55b0151dc456e75ebc4798df73f">10e6982c</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-28T16:25:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FloatOut: Only eta-expand dead-end RHS if arity will increase (#18231)
Otherwise we risk turning trivial RHS into non-trivial RHS, introducing
unnecessary bindings in the next Simplifier run, resulting in more
churn.
Fixes #18231.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/08dab5f74e021ad054112cc5f6bb7e55d8796cd7">08dab5f7</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-28T16:25:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: Recognise precise exceptions from case alternatives (#18086)
Consider
```hs
m :: IO ()
m = do
putStrLn "foo"
error "bar"
```
`m` (from #18086) always throws a (precise or imprecise) exception or
diverges. Yet demand analysis infers `<L,A>` as demand signature instead
of `<L,A>x` for it.
That's because the demand analyser sees `putStrLn` occuring in a case
scrutinee and decides that it has to `deferAfterPreciseException`,
because `putStrLn` throws a precise exception on some control flow
paths. This will mask the `botDiv` `Divergence`of the single case alt
containing `error` to `topDiv`. Since `putStrLn` has `topDiv` itself,
the final `Divergence` is `topDiv`.
This is easily fixed: `deferAfterPreciseException` works by `lub`ing
with the demand type of a virtual case branch denoting the precise
exceptional control flow. We used `nopDmdType` before, but we can be
more precise and use `exnDmdType`, which is `nopDmdType` with `exnDiv`.
Now the `Divergence` from the case alt will degrade `botDiv` to `exnDiv`
instead of `topDiv`, which combines with the result from the scrutinee
to `exnDiv`, and all is well.
Fixes #18086.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aef95f11f946f7d3f2c4c9b695d632cbfc4a993d">aef95f11</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:25:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ticky-ticky: Record DataCon name in ticker name
This makes it significantly easier to spot the nature of
allocations regressions and comes at a reasonably low cost.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f021b8c474f328441982c90c6a12f716b5607eb">8f021b8c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:26:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Don't track GHC's verbosity argument
Teach hadrian to ignore GHC's -v argument in its recompilation check,
thus fixing #18131.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13d9380b1fc8b67057a9ad4fffe244040a7f9bc0">13d9380b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-28T16:27:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rip out CmmStackInfo(updfr_space)
As noted in #18232, this field is currently completely unused and
moreover doesn't have a clear meaning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f10d11fa49fa9a7a506c4fdbdf86521c2a8d3495">f10d11fa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-29T01:38:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix "build/elem" RULE.
An redundant constraint prevented the rule from matching.
Fixing this allows a call to elem on a known list to be translated
into a series of equality checks, and eventually a simple case
expression.
Surprisingly this seems to regress elem for strings. To avoid
this we now also allow foldrCString to inline and add an UTF8
variant. This results in elem being compiled to a tight
non-allocating loop over the primitive string literal which
performs a linear search.
In the process this commit adds UTF8 variants for some of the
functions in GHC.CString. This is required to make this work for
both ASCII and UTF8 strings.
There are also small tweaks to the CString related rules.
We now allow ourselfes the luxury to compare the folding function
via eqExpr, which helps to ensure the rule fires before we inline
foldrCString*. Together with a few changes to allow matching on both
the UTF8 and ASCII variants of the CString functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bbeb2389596df61ace5778ec580895ea32cc3c6f">bbeb2389</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-29T01:39:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CoreToStg: Add Outputable ArgInfo instance
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e3361ca414012e3ec40a260c2323986ce770db6">0e3361ca</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-05-29T01:39:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Lint check return type of a join point
Consider
join x = rhs in body
It's important that the type of 'rhs' is the same as the type of
'body', but Lint wasn't checking that invariant.
Now it does! This was exposed by investigation into !3113.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c49f7df02ff02c8f09e6a6e00a271b867ca6b092">c49f7df0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-05-29T01:39:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not float join points in exprIsConApp_maybe
We hvae been making exprIsConApp_maybe cleverer in recent times:
commit b78cc64e923716ac0512c299f42d4d0012306c05
Date: Thu Nov 15 17:14:31 2018 +0100
Make constructor wrappers inline only during the final phase
commit 7833cf407d1f608bebb1d38bb99d3035d8d735e6
Date: Thu Jan 24 17:58:50 2019 +0100
Look through newtype wrappers (Trac #16254)
commit c25b135ff5b9c69a90df0ccf51b04952c2dc6ee1
Date: Thu Feb 21 12:03:22 2019 +0000
Fix exprIsConApp_maybe
But alas there was still a bug, now immortalised in
Note [Don't float join points]
in SimpleOpt.
It's quite hard to trigger because it requires a dead
join point, but it came up when compiling Cabal
Cabal.Distribution.Fields.Lexer.hs, when working on
!3113.
Happily, the fix is extremly easy. Finding the
bug was not so easy.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/46720997a0b1fa2971a884adf43de096ce130a7e">46720997</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-29T01:39:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow simplification through runRW#
Because runRW# inlines so late, we were previously able to do very
little simplification across it. For instance, given even a simple
program like
case runRW# (\s -> let n = I# 42# in n) of
I# n# -> f n#
we previously had no way to avoid the allocation of the I#.
This patch allows the simplifier to push strict contexts into the
continuation of a runRW# application, as explained in
in Note [Simplification of runRW#] in GHC.CoreToStg.Prep.
Fixes #15127.
Metric Increase:
T9961
Metric Decrease:
ManyConstructors
Co-Authored-By: Simon Peyton-Jone <simonpj@microsoft.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/277c2f26e6966e0cfaa1ddcd297af44766f37958">277c2f26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-29T01:39:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Eta expand un-saturated primops
Now since we no longer try to predict CAFfyness we have no need for the
solution to #16846. Eta expanding unsaturated primop applications is
conceptually simpler, especially in the presence of levity polymorphism.
This essentially reverts cac8dc9f51e31e4c0a6cd9bc302f7e1bc7c03beb,
as suggested in #18079.
Closes #18079.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f44d7ae08442ae6227db37cacc97fe0def8017c5">f44d7ae0</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-05-29T01:40:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Scrap deprecation plan for Data.Monoid.{First,Last}
See the discussion on the libraries mailing list for context:
https://mail.haskell.org/pipermail/libraries/2020-April/030357.html
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b4948951198f93290191d4ee32f92dffed803f4">8b494895</a></strong>
<div>
<span>by Jeremy Schlatter</span>
<i>at 2020-05-29T01:41:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/998450f4c67e8f701455927c9619b8d53f2b733b">998450f4</a></strong>
<div>
<span>by Gleb Popov</span>
<i>at 2020-05-29T01:41:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always define USE_PTHREAD_FOR_ITIMER for FreeBSD.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9a513e064bd8a33ad6f8aa5fb8673931507eca1">f9a513e0</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-05-29T01:42:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: introduce 'install' target
Its logic is very simple. It `need`s the `binary-dist-dir` target
and runs suitable `configure` and `make install` commands for the
user. A new `--prefix` command line argument is introduced to
specify where GHC should be installed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67738db10010fd28a8e997b5c8f83ea591b88a0e">67738db1</a></strong>
<div>
<span>by Travis Whitaker</span>
<i>at 2020-05-29T13:34:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Build a threaded stage 1 if the bootstrapping GHC supports it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aac19e6caa0c94e159610f124114186ee20bcdd1">aac19e6c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-05-29T13:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC NCG: No per-symbol .section ".toc" directives
All position independent symbols are collected during code generation
and emitted in one go. Prepending each symbol with a .section ".toc"
directive is redundant. This patch drops the per-symbol directives
leading to smaller assembler files.
Fixes #18250
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4413828b7c507872c56719fb8920e1c2322830f8">4413828b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-30T06:07:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Teach getNumProcessors to return available processors
Previously we would report the number of physical processors, which
can be quite wrong in a containerized setting. Now we rather return how
many processors are in our affinity mask when possible.
I also refactored the code to prefer platform-specific since this will
report logical CPUs instead of physical (using
`machdep.cpu.thread_count` on Darwin and `cpuset_getaffinity` on FreeBSD).
Fixes #14781.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1449435c7bf1075f5cd11098d8c98b99f8fe150a">1449435c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-30T06:07:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Note change in getNumProcessors in users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d96016926cc88506db416f87b6e4b68a3a0d25f">3d960169</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-30T06:07:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Drop compatibility shims for Windows Vista
We can now assume that the thread and processor group interfaces are
available.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f8f948c024c46282228243391238d09b297cd9d">7f8f948c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-05-30T06:08:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC NCG: Fix .size directive on powerpc64 ELF v1
Thanks to Sergei Trofimovich for pointing out the issue.
Fixes #18237
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c555b054bf074a9ab612f9d93e3475bfb8c6594">7c555b05</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-05-30T06:08:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize GHC.Utils.Monad.
Many functions in this module are recursive and as such are marked
loop breakers. Which means they are unlikely to get an unfolding.
This is *bad*. We always want to specialize them to specific Monads.
Which requires a visible unfolding at the use site.
I rewrote the recursive ones from:
foo f x = ... foo x' ...
to
foo f x = go x
where
go x = ...
As well as giving some pragmas to make all of them available
for specialization.
The end result is a reduction of allocations of about -1.4% for
nofib/spectral/simple/Main.hs when compiled with `-O`.
-------------------------
Metric Decrease:
T12425
T14683
T5631
T9233
T9675
T9961
WWRec
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b1cb5df126b1829fca8e8caf050dff4ca9df3f3">8b1cb5df</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-30T06:09:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Windows: Bump Windows toolchain to 0.2
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6947231abd8c33840860ad51699b76efd4725f0e">6947231a</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-05-30T06:10:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify contexts in GHC.Iface.Ext.Ast
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ee4f36c779674f7237d730460ca83aec9a6808a">2ee4f36c</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cleanup OVERWRITING_CLOSURE logic
The code is just more confusing than it needs to be. We don't need to mix
the threaded check with the ldv profiling check since ldv's init already
checks for this. Hence they can be two separate checks. Taking the sanity
checking into account is also cleaner via DebugFlags.sanity. No need for
checking the DEBUG define.
The ZERO_SLOP_FOR_LDV_PROF and ZERO_SLOP_FOR_SANITY_CHECK definitions the
old code had also make things a lot more opaque IMO so I removed those.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6159559b5eb71ed7287998e954f96cdfb2d48f04">6159559b</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix OVERWRITING_CLOSURE assuming closures are not inherently used
The new ASSERT in LDV_recordDead() was being tripped up by MVars when
removeFromMVarBlockedQueue() calls OVERWRITING_CLOSURE() via
OVERWRITE_INFO().
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/389920858e0b9efe5234cb7dac55d06e955768f7">38992085</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always zero shrunk mutable array slop when profiling
When shrinking arrays in the profiling way we currently don't always zero
the leftover slop. This means we can't traverse such closures in the heap
profiler. The old Note [zeroing slop] and #8402 have some rationale for why
this is so but I belive the reasoning doesn't apply to mutable
closures. There users already have to ensure multiple threads don't step on
each other's toes so zeroing should be safe.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0c1f2a619855a6fa22021a3118365c49f4cc0c4">b0c1f2a6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18151
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a99a1787da1dda15c6da7509ab678f4131c7d68">9a99a178</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for desugaring of PostfixOperators
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b89ca5b850b4097447cc4908cbb0631011ce979">2b89ca5b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">HsToCore: Eta expand left sections
Strangely, the comment next to this code already alluded to the fact
that even simply eta-expanding will sacrifice laziness. It's quite
unclear how we regressed so far.
See #18151.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d412d7a3783b4fc5d3078541a60996e249b4157c">d412d7a3</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-06-01T06:34:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Winferred-safe-imports: Do not exit with error
Currently, when -Winferred-safe-imports is enabled, even when it is not
turned into an error, the compiler will still exit with exit code 1 if
this warning was emitted.
Make sure it is really treated as a warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f945eea569993a4e5ed953f4573e6eab785f309f">f945eea5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:34:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Optimise log2_ceil
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aab606e4f028d3c418aafc9710003f32f8d8fe12">aab606e4</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2020-06-01T06:35:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify description of fromListN</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e5220e25baedfa7ae0ec055c03cb4429dd1af05">7e5220e2</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2020-06-01T06:35:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/GHC/Exts.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3fb1ce9759d1ca57b9ea4acf5518df8d086688e">f3fb1ce9</a></strong>
<div>
<span>by fendor</span>
<i>at 2020-06-01T06:36:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add `isInScope` check to `lintCoercion`
Mirrors the behaviour of `lintType`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ac4d94607d4a898f0015114e929ee9a38118985">5ac4d946</a></strong>
<div>
<span>by fendor</span>
<i>at 2020-06-01T06:36:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Lint rhs of IfaceRule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1cef6126a97ea1f406ffe5e780478f6e200c0496">1cef6126</a></strong>
<div>
<span>by Jeremy Schlatter</span>
<i>at 2020-06-01T06:37:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix wording in documentation
The duplicate "orphan instance" phrase here doesn't make sense, and was
probably an accident.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aaf08f25ef0629432c792880dfc6785ff3ec8a3">5aaf08f2</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-01T06:37:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Modify aclocal.m4 according to new module hierarchy
This patch updates file paths according to new module hierarchy [1]:
* Rename:
* compiler/GHC/Parser.hs <= compiler/parser/Parser.hs
* compiler/GHC/Parser/Lexer.hs <= compiler/Parser/Lexer.hs
* Add:
* compiler/GHC/Cmm/Lexer.hs
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15857ad856b6072d2c6a34b2bf7aa7316d7e2b12">15857ad8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't fail if we can't unlink __symlink_test
Afterall, it's possible we were unable to create it due to lack of
symlink permission.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a7229ef361307e16574b85f71f473f936728890">4a7229ef</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Refactor ghostscript detection
Tamar reported that he saw crashes due to unhandled exceptions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ab37eaf9668b5aacc953c6d01fcab9e4f181bf7">2ab37eaf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/perf_notes: Fix ill-typed assignments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e45d5b667653f4c3ffc89fe7a83eac56d60b9364">e45d5b66</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/testutil: Fix bytes/str mismatch
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7002d0cbbe1581dd157b530e95c62195f37cfe00">7002d0cb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T06:38:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Work around spurious mypy failure
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11390e3ab038a18c2a7bf6b2423657614a439afb">11390e3a</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-01T06:39:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up file paths for new module hierarchy
This updates comments only.
This patch replaces file references according to new module hierarchy.
See also:
* https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
* https://gitlab.haskell.org/ghc/ghc/issues/13009
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f2e5732b0eec2d99b821a7f622aee8b2c00739a">8f2e5732</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-01T06:39:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modify file paths to module paths for new module hierarchy
This updates comments only.
This patch replaces module references according to new module
hierarchy [1][2].
For files under the `compiler/` directory, I replace them as
module paths instead of file paths. For instance,
`GHC.Unit.State` instead of `compiler/GHC/Unit/State.hs` [3].
For current and future haddock's markup, this patch encloses
the module name with "" [4].
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[2]: https://gitlab.haskell.org/ghc/ghc/issues/13009
[3]: https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3375#note_276613
[4]: https://haskell-haddock.readthedocs.io/en/latest/markup.html#linking-to-modules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68b71c4a99ef7c009e0095823950cd12408ad7fe">68b71c4a</a></strong>
<div>
<span>by Tom Ellis</span>
<i>at 2020-06-01T06:39:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename the singleton tuple GHC.Tuple.Unit to GHC.Tuple.Solo
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95da76c2b9ffe2a4fb4230de0061918de3fc89a9">95da76c2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-01T06:40:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix binary-dist target for cross-compilation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/730fcd54467e82083d56fa87e44bbe346458c531">730fcd54</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-01T06:41:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve parser error messages for the @-operator
Since GHC diverges from the Haskell Report by allowing the user
to define (@) as an infix operator, we better give a good
error message when the user does so unintentionally.
In general, this is rather hard to do, as some failures will be
discovered only in the renamer or the type checker:
x :: (Integer, Integer)
x @ (a, b) = (1, 2)
This patch does *not* address this general case.
However, it gives much better error messages when the binding
is not syntactically valid:
pairs xs @ (_:xs') = zip xs xs'
Before this patch, the error message was rather puzzling:
<interactive>:1:1: error: Parse error in pattern: pairs
After this patch, the error message includes a hint:
<interactive>:1:1: error:
Parse error in pattern: pairs
In a function binding for the ‘@’ operator.
Perhaps you meant an as-pattern, which must not be surrounded by whitespace
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fde53770cacb0d54f0583707ef7ceec78f92c41">0fde5377</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-01T06:41:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve parser error messages for TypeApplications
With this patch, we always parse f @t as a type application,
thereby producing better error messages.
This steals two syntactic forms:
* Prefix form of the @-operator in expressions. Since the @-operator is
a divergence from the Haskell Report anyway, this is not a major loss.
* Prefix form of @-patterns. Since we are stealing loose infix form
anyway, might as well sacrifice the prefix form for the sake of much
better error messages.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c68e7e1e4c0bddd8b07cd8a2b3651c8cbb4b7851">c68e7e1e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-01T06:41:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve parser error messages for TemplateHaskellQuotes
While [e| |], [t| |], [d| |], and so on, steal syntax from list
comprehensions, [| |] and [|| ||] do not steal any syntax.
Thus we can improve error messages by always accepting them in the
lexer. Turns out the renamer already performs necessary validation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/120aedbdff7dbb9b394dadabb1f431608b42de67">120aedbd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-01T16:07:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable use of ld.lld on ARMv7
It turns out that lld non-deterministically fails on ARMv7. I suspect
this may be due to the a kernel regression as this only started
happening when we upgraded to 5.4. Nevertheless, easily avoided by
simply sticking with gold.
Works around #18280.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6279ff0841edee10a665275ed0d2402565fac6d">d6279ff0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-02T13:03:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Ensure that workaround for #18280 applies to bindisttest
We need to ensure that the `configure` flags working around #18280 are
propagated to the bindisttest `configure` as well.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb5c31b51b021ce86890bba73276fe6f7405f5d3">cb5c31b5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-03T17:55:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow ARMv7 job to fail
Due to #18298.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32a4ae90b50cc56f2955f489ad0cf8c7ff5e131a">32a4ae90</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-06-04T04:34:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up boot vs non-boot disambiguating types
We often have (ModuleName, Bool) or (Module, Bool) pairs for "extended"
module names (without or with a unit id) disambiguating boot and normal
modules. We think this is important enough across the compiler that it
deserves a new nominal product type. We do this with synnoyms and a
functor named with a `Gen` prefix, matching other newly created
definitions.
It was also requested that we keep custom `IsBoot` / `NotBoot` sum type.
So we have it too. This means changing many the many bools to use that
instead.
Updates `haddock` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c05756cdef800f1d8e92114222bcc480bce758b9">c05756cd</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-06-04T04:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: Add more details on InterruptibleFFI.
Details from https://gitlab.haskell.org/ghc/ghc/issues/8684
and https://github.com/takano-akio/filelock/pull/7#discussion_r280332430
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b975aedb1b74b8694d14ba8fdc5955497f8f31c">1b975aed</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2020-06-04T04:36:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow finalizeForeignPtr to be called on FinalPtr/PlainPtr.
MR 2165 (commit 49301ad6226d9a83d110bee8c419615dd94f5ded) regressed
finalizeForeignPtr by throwing exceptions when PlainPtr was encounterd.
This regression did not make it into a release of GHC. Here, the
original behavior is restored, and FinalPtr is given the same treatment
as PlainPtr.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bd3929ad1b06b01c1d22d513902507eefadc131">2bd3929a</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2020-06-04T04:36:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix documentation on type families not being extracted
It looks like the location of the Names used for CoAxioms on type
families are now located at their type constructors. Previously, Docs.hs
thought the Names were located in the RHS, so the RealSrcSpan in the
instanceMap and getInstLoc didn't match up. Fixes #18241
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6735b9d94605b4c7f75e70339bfaa4207f23e52b">6735b9d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:37:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Hs.Instances: Compile with -O0
This module contains exclusively Data instances, which are going to be
slow no matter what we do. Furthermore, they are incredibly slow to
compile with optimisation (see #9557). Consequently we compile this with
-O0. See #18254.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c330331adc0a686f24b94844d0eb3a0711b928d7">c330331a</a></strong>
<div>
<span>by nineonine</span>
<i>at 2020-06-04T04:37:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #17669
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cab684f0857c71c40996201d6fb3ba93eb38a701">cab684f0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:38:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add Windows-specific implementation of rtsSleep
Previously we would use the POSIX path, which uses `nanosleep`. However,
it turns out that `nanosleep` is provided by `libpthread` on Windows. In
general we don't want to incur such a dependency. Avoid this by simply
using `Sleep` on Windows.
Fixes #18272.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ad44b50484f27beceab8213a061aa60c7a03f7ca">ad44b504</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:38:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: Disable use of process jobs with process < 1.6.9
Due to #17926.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a4098a4bb89b3d30cca26d82b82724913062536">6a4098a4</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-04T04:55:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[linker] Adds void printLoadedObjects(void);
This allows us to dump in-memory object code locations for debugging.
Fixup printLoadedObjects prototype
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af5e3a885ddd09dd5f550552c535af3661ff3dbf">af5e3a88</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-06-05T03:18:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: fix sign confusion in log1mexp implementation (fix #17125)
author: claude (https://gitlab.haskell.org/trac-claude)
The correct threshold for log1mexp is -(log 2) with the current specification
of log1mexp. This change improves accuracy for large negative inputs.
To avoid code duplication, a small helper function is added;
it isn't the default implementation in Floating because it needs Ord.
This patch does nothing to address that the Haskell specification is
different from that in common use in other languages.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b792facab46f7cdd09d12e79499f4e0dcd4293f">2b792fac</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-05T09:27:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simple subsumption
This patch simplifies GHC to use simple subsumption.
Ticket #17775
Implements GHC proposal #287
https://github.com/ghc-proposals/ghc-proposals/blob/master/
proposals/0287-simplify-subsumption.rst
All the motivation is described there; I will not repeat it here.
The implementation payload:
* tcSubType and friends become noticably simpler, because it no
longer uses eta-expansion when checking subsumption.
* No deeplyInstantiate or deeplySkolemise
That in turn means that some tests fail, by design; they can all
be fixed by eta expansion. There is a list of such changes below.
Implementing the patch led me into a variety of sticky corners, so
the patch includes several othe changes, some quite significant:
* I made String wired-in, so that
"foo" :: String rather than
"foo" :: [Char]
This improves error messages, and fixes #15679
* The pattern match checker relies on knowing about in-scope equality
constraints, andd adds them to the desugarer's environment using
addTyCsDs. But the co_fn in a FunBind was missed, and for some reason
simple-subsumption ends up with dictionaries there. So I added a
call to addTyCsDs. This is really part of #18049.
* I moved the ic_telescope field out of Implication and into
ForAllSkol instead. This is a nice win; just expresses the code
much better.
* There was a bug in GHC.Tc.TyCl.Instance.tcDataFamInstHeader.
We called checkDataKindSig inside tc_kind_sig, /before/
solveEqualities and zonking. Obviously wrong, easily fixed.
* solveLocalEqualitiesX: there was a whole mess in here, around
failing fast enough. I discovered a bad latent bug where we
could successfully kind-check a type signature, and use it,
but have unsolved constraints that could fill in coercion
holes in that signature -- aargh.
It's all explained in Note [Failure in local type signatures]
in GHC.Tc.Solver. Much better now.
* I fixed a serious bug in anonymous type holes. IN
f :: Int -> (forall a. a -> _) -> Int
that "_" should be a unification variable at the /outer/
level; it cannot be instantiated to 'a'. This was plain
wrong. New fields mode_lvl and mode_holes in TcTyMode,
and auxiliary data type GHC.Tc.Gen.HsType.HoleMode.
This fixes #16292, but makes no progress towards the more
ambitious #16082
* I got sucked into an enormous refactoring of the reporting of
equality errors in GHC.Tc.Errors, especially in
mkEqErr1
mkTyVarEqErr
misMatchMsg
misMatchMsgOrCND
In particular, the very tricky mkExpectedActualMsg function
is gone.
It took me a full day. But the result is far easier to understand.
(Still not easy!) This led to various minor improvements in error
output, and an enormous number of test-case error wibbles.
One particular point: for occurs-check errors I now just say
Can't match 'a' against '[a]'
rather than using the intimidating language of "occurs check".
* Pretty-printing AbsBinds
Tests review
* Eta expansions
T11305: one eta expansion
T12082: one eta expansion (undefined)
T13585a: one eta expansion
T3102: one eta expansion
T3692: two eta expansions (tricky)
T2239: two eta expansions
T16473: one eta
determ004: two eta expansions (undefined)
annfail06: two eta (undefined)
T17923: four eta expansions (a strange program indeed!)
tcrun035: one eta expansion
* Ambiguity check at higher rank. Now that we have simple
subsumption, a type like
f :: (forall a. Eq a => Int) -> Int
is no longer ambiguous, because we could write
g :: (forall a. Eq a => Int) -> Int
g = f
and it'd typecheck just fine. But f's type is a bit
suspicious, and we might want to consider making the
ambiguity check do a check on each sub-term. Meanwhile,
these tests are accepted, whereas they were previously
rejected as ambiguous:
T7220a
T15438
T10503
T9222
* Some more interesting error message wibbles
T13381: Fine: one error (Int ~ Exp Int)
rather than two (Int ~ Exp Int, Exp Int ~ Int)
T9834: Small change in error (improvement)
T10619: Improved
T2414: Small change, due to order of unification, fine
T2534: A very simple case in which a change of unification order
means we get tow unsolved constraints instead of one
tc211: bizarre impredicative tests; just accept this for now
Updates Cabal and haddock submodules.
Metric Increase:
T12150
T12234
T5837
haddock.base
Metric Decrease:
haddock.compiler
haddock.Cabal
haddock.base
Merge note: This appears to break the
`UnliftedNewtypesDifficultUnification` test. It has been marked as
broken in the interest of merging.
(cherry picked from commit 66b7b195cb3dce93ed5078b80bf568efae904cc5)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2dff814158e08aed53036bf6ebd7c3c8394af438">2dff8141</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-05T14:21:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify bindLHsTyVarBndrs and bindHsQTyVars
Both `bindLHsTyVarBndrs` and `bindHsQTyVars` take two separate
`Maybe` arguments, which I find terribly confusing. Thankfully, it's
possible to remove one `Maybe` argument from each of these functions,
which this patch accomplishes:
* `bindHsQTyVars` takes a `Maybe SDoc` argument, which is `Just` if
GHC should warn about any of the quantified type variables going
unused. However, every call site uses `Nothing` in practice. This
makes sense, since it doesn't really make sense to warn about
unused type variables bound by an `LHsQTyVars`. For instance, you
wouldn't warn about the `a` in `data Proxy a = Proxy` going unused.
As a result, I simply remove this `Maybe SDoc` argument altogether.
* `bindLHsTyVarBndrs` also takes a `Maybe SDoc` argument for the same
reasons that `bindHsQTyVars` took one. To make things more
confusing, however, `bindLHsTyVarBndrs` also takes a separate
`HsDocContext` argument, which is pretty-printed (to an `SDoc`) in
warnings and error messages.
In practice, the `Maybe SDoc` and the `HsDocContext` often contain
the same text. See the call sites for `bindLHsTyVarBndrs` in
`rnFamInstEqn` and `rnConDecl`, for instance. There are only a
handful of call sites where the text differs between the
`Maybe SDoc` and `HsDocContext` arguments:
* In `rnHsRuleDecl`, where the `Maybe SDoc` says "`In the rule`"
and the `HsDocContext` says "`In the transformation rule`".
* In `rnHsTyKi`/`rn_ty`, where the `Maybe SDoc` says
"`In the type`" but the `HsDocContext` is inhereted from the
surrounding context (e.g., if `rnHsTyKi` were called on a
top-level type signature, the `HsDocContext` would be
"`In the type signature`" instead)
In both cases, warnings/error messages arguably _improve_ by
unifying making the `Maybe SDoc`'s text match that of the
`HsDocContext`. As a result, I decided to remove the `Maybe SDoc`
argument to `bindLHsTyVarBndrs` entirely and simply reuse the text
from the `HsDocContext`. (I decided to change the phrase
"transformation rule" to "rewrite rule" while I was in the area.)
The `Maybe SDoc` argument has one other purpose: signaling when to
emit "`Unused quantified type variable`" warnings. To recover this
functionality, I replaced the `Maybe SDoc` argument with a
boolean-like `WarnUnusedForalls` argument. The only
`bindLHsTyVarBndrs` call site that chooses _not_ to emit these
warnings in `bindHsQTyVars`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e372331b3212e5d8eddfa6f8d2c3840b7e95c2b3">e372331b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-07T08:46:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add missing deriveConstants dependency on ghcplatform.h
deriveConstants wants to compile C sources which #include PosixSource.h,
which itself #includes ghcplatform.h. Make sure that Hadrian knows
about this dependency.
Fixes #18290.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b022051a50d30e39d86ee21e565e899e7e98255f">b022051a</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-prim needs to depend on libc and libm
libm is just an empty shell on musl, and all the math functions are contained in
libc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6dae65484f9552239652f743e2303fa17aae953b">6dae6548</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable DLL loading if without system linker
Some platforms (musl, aarch64) do not have a working dynamic linker
implemented in the libc, even though we might see dlopen. It will
ultimately just return that this is not supported. Hence we'll add
a flag to the compiler to flat our disable loading dlls. This is
needed as we will otherwise try to load the shared library even
if this will subsequently fail. At that point we have given up
looking for static options though.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a158ffc4e0ac250897aefaf6caf03eb5f688182">4a158ffc</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Range is actually +/-2^32, not +/-2^31
See also: https://static.docs.arm.com/ihi0056/g/aaelf64.pdf
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1bfb806683b3092fc5ead84e7ecff928c55fbc4">f1bfb806</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-07T10:49:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">OccurAnal: Avoid exponential behavior due to where clauses
Previously the `Var` case of `occAnalApp` could in some cases (namely
in the case of `runRW#` applications) call `occAnalRhs` two. In the case
of nested `runRW#`s this results in exponential complexity. In some
cases the compilation time that resulted would be very long indeed
(see #18296).
Fixes #18296.
Metric Decrease:
T9961
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b607671b9158c60470b2bd57804a7684d3ea33f">9b607671</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-09T08:05:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add link to GHC's wiki in the GHC API header
This adds a URL to point to GHC's wiki in the GHC API header.
Newcomers could easily find more information from the GHC API's
web like [1].
[1]: Current version, https://ghc.gitlab.haskell.org/ghc/doc/libraries/ghc-8.11.0.20200604/index.html
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72c7fe9a1e147dfeaf043f6d591d724a126cce45">72c7fe9a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-09T08:06:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make GADT constructors adhere to the forall-or-nothing rule properly
Issue #18191 revealed that the types of GADT constructors don't quite
adhere to the `forall`-or-nothing rule. This patch serves to clean up
this sad state of affairs somewhat. The main change is not in the
code itself, but in the documentation, as this patch introduces two
sections to the GHC User's Guide:
* A "Formal syntax for GADTs" section that presents a BNF-style
grammar for what is and isn't allowed in GADT constructor types.
This mostly exists to codify GHC's existing behavior, but it also
imposes a new restriction that addresses #18191: the outermost
`forall` and/or context in a GADT constructor is not allowed to be
surrounded by parentheses. Doing so would make these
`forall`s/contexts nested, and GADTs do not support nested
`forall`s/contexts at present.
* A "`forall`-or-nothing rule" section that describes exactly what
the `forall`-or-nothing rule is all about. Surprisingly, there was
no mention of this anywhere in the User's Guide up until now!
To adhere the new specification in the "Formal syntax for GADTs"
section of the User's Guide, the following code changes were made:
* A new function, `GHC.Hs.Type.splitLHsGADTPrefixTy`, was introduced.
This is very much like `splitLHsSigmaTy`, except that it avoids
splitting apart any parentheses, which can be syntactically
significant for GADT types. See
`Note [No nested foralls or contexts in GADT constructors]` in
`GHC.Hs.Type`.
* `ConDeclGADTPrefixPs`, an extension constructor for `XConDecl`, was
introduced so that `GHC.Parser.PostProcess.mkGadtDecl` can return
it when given a prefix GADT constructor. Unlike `ConDeclGADT`,
`ConDeclGADTPrefixPs` does not split the GADT type into its argument
and result types, as this cannot be done until after the type is
renamed (see `Note [GADT abstract syntax]` in `GHC.Hs.Decls` for why
this is the case).
* `GHC.Renamer.Module.rnConDecl` now has an additional case for
`ConDeclGADTPrefixPs` that (1) splits apart the full `LHsType` into
its `forall`s, context, argument types, and result type, and
(2) checks for nested `forall`s/contexts. Step (2) used to be
performed the typechecker (in `GHC.Tc.TyCl.badDataConTyCon`) rather
than the renamer, but now the relevant code from the typechecker
can simply be deleted.
One nice side effect of this change is that we are able to give a
more accurate error message for GADT constructors that use visible
dependent quantification (e.g., `MkFoo :: forall a -> a -> Foo a`),
which improves the stderr in the `T16326_Fail6` test case.
Fixes #18191. Bumps the Haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47e6442bc4be4a33339499d876792ba109e8d32">a47e6442</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-10T03:39:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always use rnImplicitBndrs to bring implicit tyvars into scope
This implements a first step towards #16762 by changing the renamer
to always use `rnImplicitBndrs` to bring implicitly bound type
variables into scope. The main change is in `rnFamInstEqn` and
`bindHsQTyVars`, which previously used _ad hoc_ methods of binding
their implicit tyvars.
There are a number of knock-on consequences:
* One of the reasons that `rnFamInstEqn` used an _ad hoc_ binding
mechanism was to give more precise source locations in
`-Wunused-type-patterns` warnings. (See
https://gitlab.haskell.org/ghc/ghc/issues/16762#note_273343 for an
example of this.) However, these warnings are actually a little
_too_ precise, since implicitly bound type variables don't have
exact binding sites like explicitly bound type variables do.
A similar problem existed for
"`Different names for the same type variable`" errors involving
implicit tyvars bound by `bindHsQTyVars`.
Therefore, we simply accept the less precise (but more accurate)
source locations from `rnImplicitBndrs` in `rnFamInstEqn` and
`bindHsQTyVars`. See
`Note [Source locations for implicitly bound type variables]` in
`GHC.Rename.HsType` for the full story.
* In order for `rnImplicitBndrs` to work in `rnFamInstEqn`, it needs
to be able to look up names from the parent class (in the event
that we are renaming an associated type family instance). As a
result, `rnImplicitBndrs` now takes an argument of type
`Maybe assoc`, which is `Just` in the event that a type family
instance is associated with a class.
* Previously, GHC kept track of three type synonyms for free type
variables in the renamer: `FreeKiTyVars`, `FreeKiTyVarsDups`
(which are allowed to contain duplicates), and
`FreeKiTyVarsNoDups` (which contain no duplicates). However, making
is a distinction between `-Dups` and `-NoDups` is now pointless, as
all code that returns `FreeKiTyVars{,Dups,NoDups}` will eventually
end up being passed to `rnImplicitBndrs`, which removes duplicates.
As a result, I decided to just get rid of `FreeKiTyVarsDups` and
`FreeKiTyVarsNoDups`, leaving only `FreeKiTyVars`.
* The `bindLRdrNames` and `deleteBys` functions are now dead code, so
I took the liberty of removing them.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2487912938f188cb264e4a11d21bf750adccc5e7">24879129</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-10T03:39:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify leaf module names for new module hierarchy
This updates comments only.
This patch replaces leaf module names according to new module
hierarchy [1][2] as followings:
* Expand leaf names to easily find the module path:
for instance, `Id.hs` to `GHC.Types.Id`.
* Modify leaf names according to new module hierarchy:
for instance, `Convert.hs` to `GHC.ThToHs`.
* Fix typo:
for instance, `GHC.Core.TyCo.Rep.hs` to `GHC.Core.TyCo.Rep`
See also !3375
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[2]: https://gitlab.haskell.org/ghc/ghc/issues/13009
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92de9e25aa1a6f7aa73154868521bcf4f0dc9d1e">92de9e25</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-06-10T03:41:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Remove unused GET_ENTRY closure macro
This macro is not used and got broken in the meantime, as ENTRY_CODE was
deleted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/87102928cce33d9029ca4cc449dde6efc802b8ec">87102928</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-06-10T03:41:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix -fkeep-cafs flag name in users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ccd6843d4a39920b4fa02badbe82e529390d4a74">ccd6843d</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2020-06-10T04:14:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expose impliedGFlags, impledOffGFlags, impliedXFlags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a737e898014d92bdbeed2e1cf5c35fc0a91a547">7a737e89</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-06-10T04:14:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cross-module LambdaFormInfo passing
- Store LambdaFormInfos of exported Ids in interface files
- Use them in importing modules
This is for optimization purposes: if we know LambdaFormInfo of imported
Ids we can generate more efficient calling code, see `getCallMethod`.
Exporting (putting them in interface files or in ModDetails) and
importing (reading them from interface files) are both optional. We
don't assume known LambdaFormInfos anywhere and do not change how we
call Ids with unknown LambdaFormInfos.
Runtime, allocation, and residency numbers when building
Cabal-the-library (commit 0d4ee7ba3):
(Log and .hp files are in the MR: !2842)
| | GHC HEAD | This patch | Diff |
|-----|----------|------------|----------------|
| -O0 | 0:35.89 | 0:34.10 | -1.78s, -4.98% |
| -O1 | 2:24.01 | 2:23.62 | -0.39s, -0.27% |
| -O2 | 2:52.23 | 2:51.35 | -0.88s, -0.51% |
| | GHC HEAD | This patch | Diff |
|-----|-----------------|-----------------|----------------------------|
| -O0 | 54,843,608,416 | 54,878,769,544 | +35,161,128 bytes, +0.06% |
| -O1 | 227,136,076,400 | 227,569,045,168 | +432,968,768 bytes, +0.19% |
| -O2 | 266,147,063,296 | 266,749,643,440 | +602,580,144 bytes, +0.22% |
NOTE: Residency is measured with extra runtime args: `-i0 -h` which effectively
turn all GCs into major GCs, and do GC more often.
| | GHC HEAD | This patch | Diff |
|-----|----------------------------|------------------------------|----------------------------|
| -O0 | 410,284,000 (910 samples) | 411,745,008 (906 samples) | +1,461,008 bytes, +0.35% |
| -O1 | 928,580,856 (2109 samples) | 943,506,552 (2103 samples) | +14,925,696 bytes, +1.60% |
| -O2 | 993,951,352 (2549 samples) | 1,010,156,328 (2545 samples) | +16,204,9760 bytes, +1.63% |
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% +0.1%
VSM 0.0% 0.0% +0.0% +0.0% +0.0%
anna 0.0% 0.0% -0.3% -0.8% -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% -0.1% -0.3% 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% -0.2% 0.0%
cacheprof 0.0% 0.0% -0.1% -0.4% +0.0%
calendar 0.0% 0.0% -0.0% -0.0% 0.0%
cichelli 0.0% 0.0% -0.9% -2.4% 0.0%
circsim 0.0% 0.0% -0.0% -0.0% 0.0%
clausify 0.0% 0.0% -0.1% -0.3% 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% -0.1% -0.2% -0.0%
cryptarithm1 0.0% 0.0% -0.0% -0.0% 0.0%
cryptarithm2 0.0% 0.0% -1.4% -4.1% -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% -0.1% -0.2% 0.0%
eliza 0.0% 0.0% -0.5% -1.5% 0.0%
event 0.0% 0.0% -0.0% -0.0% -0.0%
exact-reals 0.0% 0.0% -0.1% -0.3% +0.0%
exp3_8 0.0% 0.0% -0.0% -0.0% -0.0%
expert 0.0% 0.0% -0.3% -1.0% -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% -0.4% -1.2% +0.0%
fulsom 0.0% 0.0% -0.0% -0.0% 0.0%
gamteb 0.0% 0.0% -0.1% -0.3% 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% -0.1% -0.4% -0.0%
hpg 0.0% 0.0% -0.2% -0.5% +0.0%
ida 0.0% 0.0% -0.0% -0.0% +0.0%
infer 0.0% 0.0% -0.3% -0.8% -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% -2.2% -5.4% 0.0%
lambda 0.0% 0.0% -0.6% -1.8% 0.0%
last-piece 0.0% 0.0% -0.0% -0.0% 0.0%
lcss 0.0% 0.0% -0.0% -0.1% 0.0%
life 0.0% 0.0% -0.0% -0.1% 0.0%
lift 0.0% 0.0% -0.2% -0.6% +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% -0.1% -0.3% +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% -0.2% -1.0% 0.0%
mkhprog 0.0% 0.0% -0.1% -0.2% -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% -0.1% -0.2% 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 0.0% 0.0% -0.2% -0.7% 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% -0.2% -0.6% +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% -0.3% -1.1% 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% -0.7% -2.5% -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% -0.1% -0.2% -0.0%
sched 0.0% 0.0% -0.0% -0.0% -0.0%
scs 0.0% 0.0% -1.0% -2.6% +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% -0.6% -1.6% 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% -0.2% -0.4% +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% -2.2% -5.4% -0.0%
Max +0.0% 0.0% +0.0% +0.0% +0.1%
Geometric Mean -0.0% -0.0% -0.1% -0.3% +0.0%
Metric increases micro benchmarks tracked in #17686:
Metric Increase:
T12150
T12234
T12425
T13035
T5837
T6048
T9233
Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b22b14a7a1c1819fc8682fc127acf7448c5630c">3b22b14a</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2020-06-10T04:15:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Give Language a Bounded instance
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9454511b0bdfcd79a1899d7f24bf65a3eb0d06e3">9454511b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-10T04:17:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimisation in Unique.Supply
This patch switches on -fno-state-hack in GHC.Types.Unique.Supply.
It turned out that my fixes for #18078 (coercion floating) changed the
optimisation pathway for mkSplitUniqSupply in such a way that we had
an extra allocation inside the inner loop. Adding -fno-state-hack
fixed that -- and indeed the loop in mkSplitUniqSupply is a classic
example of the way in which -fno-state-hack can be bad; see #18238.
Moreover, the new code is better than the old. They allocate
the same, but the old code ends up with a partial application.
The net effect is that the test
perf/should_run/UniqLoop
runs 20% faster! From 2.5s down to 2.0s. The allocation numbers
are the same -- but elapsed time falls. Good!
The bad thing about this is that it's terribly delicate. But
at least it's a good example of such delicacy in action.
There is a long Note [Optimising the unique supply] which now
explains all this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d49d5be904c0c01788fa7aae1b112d5b4dfaf1c">6d49d5be</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-10T04:17:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement cast worker/wrapper properly
The cast worker/wrapper transformation transforms
x = e |> co
into
y = e
x = y |> co
This is done by the simplifier, but we were being
careless about transferring IdInfo from x to y,
and about what to do if x is a NOINLNE function.
This resulted in a series of bugs:
#17673, #18093, #18078.
This patch fixes all that:
* Main change is in GHC.Core.Opt.Simplify, and
the new prepareBinding function, which does this
cast worker/wrapper transform.
See Note [Cast worker/wrappers].
* There is quite a bit of refactoring around
prepareRhs, makeTrivial etc. It's nicer now.
* Some wrappers from strictness and cast w/w, notably those for
a function with a NOINLINE, should inline very late. There
wasn't really a mechanism for that, which was an existing bug
really; so I invented a new finalPhase = Phase (-1). It's used
for all simplifier runs after the user-visible phase 2,1,0 have
run. (No new runs of the simplifier are introduced thereby.)
See new Note [Compiler phases] in GHC.Types.Basic;
the main changes are in GHC.Core.Opt.Driver
* Doing this made me trip over two places where the AnonArgFlag on a
FunTy was being lost so we could end up with (Num a -> ty)
rather than (Num a => ty)
- In coercionLKind/coercionRKind
- In contHoleType in the Simplifier
I fixed the former by defining mkFunctionType and using it in
coercionLKind/RKind.
I could have done the same for the latter, but the information
is almost to hand. So I fixed the latter by
- adding sc_hole_ty to ApplyToVal (like ApplyToTy),
- adding as_hole_ty to ValArg (like TyArg)
- adding sc_fun_ty to StrictArg
Turned out I could then remove ai_type from ArgInfo. This is
just moving the deck chairs around, but it worked out nicely.
See the new Note [AnonArgFlag] in GHC.Types.Var
* When looking at the 'arity decrease' thing (#18093) I discovered
that stable unfoldings had a much lower arity than the actual
optimised function. That's what led to the arity-decrease
message. Simple solution: eta-expand.
It's described in Note [Eta-expand stable unfoldings]
in GHC.Core.Opt.Simplify
* I also discovered that unsafeCoerce wasn't being inlined if
the context was boring. So (\x. f (unsafeCoerce x)) would
create a thunk -- yikes! I fixed that by making inlineBoringOK
a bit cleverer: see Note [Inline unsafeCoerce] in GHC.Core.Unfold.
I also found that unsafeCoerceName was unused, so I removed it.
I made a test case for #18078, and a very similar one for #17673.
The net effect of all this on nofib is very modest, but positive:
--------------------------------------------------------------------------------
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
anna -0.4% -0.1% -3.1% -3.1% 0.0%
fannkuch-redux -0.4% -0.3% -0.1% -0.1% 0.0%
maillist -0.4% -0.1% -7.8% -1.0% -14.3%
primetest -0.4% -15.6% -7.1% -6.6% 0.0%
--------------------------------------------------------------------------------
Min -0.9% -15.6% -13.3% -14.2% -14.3%
Max -0.3% 0.0% +12.1% +12.4% 0.0%
Geometric Mean -0.4% -0.2% -2.3% -2.2% -0.1%
All following metric decreases are compile-time allocation decreases
between -1% and -3%:
Metric Decrease:
T5631
T13701
T14697
T15164
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32fd37f5e1e6dc6e3b664ae41e0041ed8a19ae21">32fd37f5</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2020-06-10T04:17:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix lookupGlobalOccRn_maybe sometimes reporting an error
In some cases it was possible for lookupGlobalOccRn_maybe to return an
error, when it should be returning a Nothing. If it called
lookupExactOcc_either when there were no matching GlobalRdrElts in the
otherwise case, it would return an error message. This could be caused
when lookupThName_maybe in Template Haskell was looking in different
namespaces (thRdrNameGuesses), guessing different namespaces that the
name wasn't guaranteed to be found in.
However, by addressing this some more accurate errors were being lost in
the conversion to Maybes. So some of the lookup* functions have been
shuffled about so that errors should always be ignored in
lookup*_maybes, and propagated otherwise.
This fixes #18263
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b283e1b2a46af614d89b0e3a0dfd23871511c17">9b283e1b</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-06-10T04:17:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Initialize the allocation counter in GHCi to 0 (Fixes #16012)
According to the documentation for the function `getAllocationCounter` in
[System.Mem](http://hackage.haskell.org/package/base-4.14.0.0/docs/System-Mem.html)
initialize the allocationCounter also in GHCi to 0.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d07c48ce3fde32a3c08c84764e0859b84eee461">8d07c48c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-10T04:17:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">test: fix conc038
We had spurious failures of conc038 test on CI with stdout:
```
newThread started
-mainThread
-Haskell: 2
newThread back again
+mainThread
1 sec later
shutting down
+Haskell: 2
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c7e9689f6fcc3eb974f0a76ae8078abda30026d">4c7e9689</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-06-11T10:37:38+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Release Notes: Add news from the pattern-match checker [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3445b9652671280920755ee3d2b49780eeb3a991">3445b965</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Only test T16190 with the NCG
T16190 is meant to test a NCG feature. It has already caused spurious
failures in other MRs (e.g. !2165) when LLVM is used.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2517a51c0f949c1021de9f7c16f67345c6ab78a9">2517a51c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags refactoring VIII (#17957)
* Remove several uses of `sdocWithDynFlags`, especially in GHC.Llvm.*
* Add LlvmOpts datatype to store Llvm backend options
* Remove Outputable instances (for LlvmVar, LlvmLit, LlvmStatic and
Llvm.MetaExpr) which require LlvmOpts.
* Rename ppMetaExpr into ppMetaAnnotExpr (pprMetaExpr is now used in place of `ppr :: MetaExpr -> SDoc`)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a02599afe836ac32c2e732671415d0afdfbf7fb">7a02599a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72d086106d49bc18277f3a066e671e87e9b37a1b">72d08610</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor homeUnit
* rename thisPackage into homeUnit
* document and refactor several Backpack things
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dc71f5577a541168951371bd55b51a588b57813">8dc71f55</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename unsafeGetUnitInfo into unsafeLookupUnit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6be6e432e53108075905c1fc7785d8b1f18a33f">f6be6e43</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add allowVirtualUnits field in PackageState
Instead of always querying DynFlags to know whether we are allowed to
use virtual units (i.e. instantiated on-the-fly, cf Note [About units]
in GHC.Unit), we store it once for all in
`PackageState.allowVirtualUnits`.
This avoids using DynFlags too much (cf #17957) and is preliminary work
for #14335.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e7272d53e67e72580caceae40e766c4bfeb1c398">e7272d53</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enhance UnitId use
* use UnitId instead of String to identify wired-in units
* use UnitId instead of Unit in the backend (Unit are only use by
Backpack to produce type-checked interfaces, not real code)
* rename lookup functions for consistency
* documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c5572cd29924dcc6effd8e102c9bb30d7b39bec">9c5572cd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove LinkerUnitId type alias
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d345edfe96a3fdf35b8e953c1a4aacc325ca948e">d345edfe</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor WiredMap
* Remove WiredInUnitId and WiredUnitId type aliases
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d171cd6d5cfbc8eae12cd1b152541d4f285b245">3d171cd6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document and refactor `mkUnit` and `mkUnitInfoMap`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2109b4f10ddbe09ac3397486922142f0cadaacc">d2109b4f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove PreloadUnitId type alias
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f50c19b8a78da9252cb39f49c1c66db4a684cc3b">f50c19b8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename listUnitInfoMap into listUnitInfo
There is no Map involved
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed533ec217667423e4fce30040f24053dbcc7de4">ed533ec2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename Package into Unit
The terminology changed over time and now package databases contain
"units" (there can be several units compiled from a single Cabal
package: one per-component, one for each option set, one per
instantiation, etc.). We should try to be consistent internally and use
"units": that's what this renaming does. Maybe one day we'll fix the UI
too (e.g. replace -package-id with -unit-id, we already have
-this-unit-id and ghc-pkg has -unit-id...) but it's not done in this
patch.
* rename getPkgFrameworkOpts into getUnitFrameworkOpts
* rename UnitInfoMap into ClosureUnitInfoMap
* rename InstalledPackageIndex into UnitInfoMap
* rename UnusablePackages into UnusableUnits
* rename PackagePrecedenceIndex into UnitPrecedenceMap
* rename PackageDatabase into UnitDatabase
* rename pkgDatabase into unitDatabases
* rename pkgState into unitState
* rename initPackages into initUnits
* rename renamePackage into renameUnitInfo
* rename UnusablePackageReason into UnusableUnitReason
* rename getPackage* into getUnit*
* etc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/202728e529f2faa88731b9f4b34b2ac567eb7c95">202728e5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make ClosureUnitInfoMap uses UnitInfoMap
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55b4263e1a53cc27b1da9227249bdcd20139ddc9">55b4263e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove ClosureUnitInfoMap
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/653d17bdd57ec8ca9b11b19e45860982bd1e7c9e">653d17bd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename Package into Unit (2)
* rename PackageState into UnitState
* rename findWiredInPackages into findWiredInUnits
* rename lookupModuleInAll[Packages,Units]
* etc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae900605c4860684c51584dac271956635eb60cc">ae900605</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move dump_mod_map into initUnits
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/598cc1dde543807902fd502b5e2f8050ebac1fa5">598cc1dd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move wiring of homeUnitInstantiations outside of mkUnitState
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/437265eb26b45a2de3ac537b6bc9a81986d4f7ae">437265eb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid timing module map dump in initUnits
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9400aa934880695b83201e192998de2576cfdf92">9400aa93</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove preload parameter of mkUnitState
* Remove preload parameter (unused)
* Don't explicitly return preloaded units: redundant because already
returned as "preloadUnits" field of UnitState
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/266bc3d9c3735620598ab18ff6ac9c44134cbbff">266bc3d9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: refactor unwireUnit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e715c1b84702dc60fe31fd19dacf85335d59b27">9e715c1b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document getPreloadUnitsAnd
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd5810dc4e23331ca4f73ec3b1818c3350b5bbd7">bd5810dc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: remove useless add_package parameter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/36e1daf0a604d98a34d9a066a01dd4f5439b4aca">36e1daf0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: make listVisibleModuleNames take a UnitState
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5226da37845ae82bff0e3e6b16be7453e3d9370d">5226da37</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor and document add_package
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b53aac1e2128fa9baa5fd4623fcb3afd2602870">4b53aac1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor and document closeUnitDeps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42c054f6cd7a9890c3e9d2d0c444252abe08a8d5">42c054f6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: findWiredInUnits
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a444d01bc97be99b7743b752a33ca9982de4c0f1">a444d01b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: reportCycles, reportUnusable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8408d521a67e2af4012d886d6a7e2af02ce42add">8408d521</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: merge_databases
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fca2d25ff76d442d0825847643ed7448492e0e55">fca2d25f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: add UnitConfig datatype
Avoid directly querying flags from DynFlags to build the UnitState.
Instead go via UnitConfig so that we could reuse this to make another
UnitState for plugins.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4274688a6333abffdfe7c7bda252c566f947afdf">4274688a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move distrustAll into mkUnitState
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28d804e1e12a6be9bcd94b4667e27ba73beade38">28d804e1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Create helper upd_wired_in_home_instantiations
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac964c8350ba41082e9dca9cf1b7ff02aea2a636">ac964c83</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put database cache in UnitConfig
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfd0a78cdd0287c26998a4d9419174e4dc305c6f">bfd0a78c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't return preload units when we set DyNFlags
Preload units can be retrieved in UnitState when needed (i.e. in GHCi)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1fbb4bf5f3d31f115e5a824588efc529cebf3185">1fbb4bf5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NCGConfig: remove useless ncgUnitId field
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c10ff7e7e5e5bd687938b5a4256e980cf58fcad1">c10ff7e7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Doc: fix some comments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/456e17f035238984e487870fe8007f5fb5f726cf">456e17f0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump haddock submodule and allow metric decrease
Metric Decrease:
T12150
T12234
T5837
Metric Increase:
T16190
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/429539025450757e30124fa9ee33206deeb951a2">42953902</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-13T02:13:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Trim the demand for recursive product types
Ticket #18304 showed that we need to be very careful
when exploring the demand (esp usage demand) on recursive
product types.
This patch solves the problem by trimming the demand on such types --
in effect, a form of "widening".
See the Note [Trimming a demand to a type] in DmdAnal, which explains
how I did this by piggy-backing on an existing mechansim for trimming
demands becuase of GADTs. The significant payload of this patch is
very small indeed:
* Make GHC.Core.Opt.WorkWrap.Utils.typeShape use RecTcChecker to
avoid looking through recursive types.
But on the way
* I found that ae_rec_tc was entirely inoperative and did nothing.
So I removed it altogether from DmdAnal.
* I moved some code around in DmdAnal and Demand.
(There are no actual changes in dmdFix.)
* I changed the API of DmsAnal.dmdAnalRhsLetDown to return
a StrictSig rather than a decorated Id
* I removed the dead function peelTsFuns from Demand
Performance effects:
Nofib: 0.0% changes. Not surprising, because they don't
use recursive products
Perf tests
T12227:
1% increase in compiler allocation, becuase $cto gets w/w'd.
It did not w/w before because it takes a deeply nested
argument, so the worker gets too many args, so we abandon w/w
altogether (see GHC.Core.Opt.WorkWrap.Utils.isWorkerSmallEnough)
With this patch we trim the demands. That is not strictly
necessary (since these Generic type constructors are like
tuples -- they can't cause a loop) but the net result is that
we now w/w $cto which is fine.
UniqLoop:
16% decrease in /runtime/ allocation. The UniqSupply is a
recursive product, so currently we abandon all strictness on
'churn'. With this patch 'churn' gets useful strictness, and
we w/w it. Hooray
Metric Decrease:
UniqLoop
Metric Increase:
T12227
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/87d504f475471c61305b29578da2656f9ff9653e">87d504f4</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2020-06-13T02:13:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add introductory prose for Data.Traversable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f09b608eecf07ad6c27729f7b6f74aca4e17e6c">9f09b608</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-06-13T02:13:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #12073: Add MonadFix Q instance
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/220c2d34a34727d696cc4b44a1b87aba83231ce4">220c2d34</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-13T02:13:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Increase size of T12150
As noted in #18319, this test was previously very fragile. Increase its
size to make it more likely that its fails with its newly-increased
acceptance threshold.
Metric Increase:
T12150
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bba1c26193e704d2d6bb2be9a2fac668b0ea54c">8bba1c26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-13T04:59:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Always push perf notes
Previously we ci.sh would run with `set -e` implying that we wouldn't
push perf notes if the testsuite were to fail, even if it *only* failed
due to perf notes. This rendered the whole performance testing story
quite fragile as a single regressing commit would cause every successive
commit to fail since a new baseline would not be uploaded.
Fix this by ensuring that we always push performance notes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a773f169cfe072c7b29924c53075e4dfa4e2adb">7a773f16</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-13T15:10:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Eliminate redundant push of CI metrics
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a31218f7737a65b6333ec7905e88dc094703f025">a31218f7</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-13T15:58:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use HsForAllTelescope to avoid inferred, visible foralls
Currently, `HsForAllTy` permits the combination of `ForallVis` and
`Inferred`, but you can't actually typecheck code that uses it
(e.g., `forall {a} ->`). This patch refactors `HsForAllTy` to use a
new `HsForAllTelescope` data type that makes a type-level distinction
between visible and invisible `forall`s such that visible `forall`s
do not track `Specificity`. That part of the patch is actually quite
small; the rest is simply changing consumers of `HsType` to
accommodate this new type.
Fixes #18235. Bumps the `haddock` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c0e6dee99242eff08420176a36d77b715972f1f2">c0e6dee9</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-06-14T09:07:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add Atomic Exchange PrimOp and implement Atomic Ptr exchanges.
The initial version was rewritten by Tamar Christina.
It was rewritten in large parts by Andreas Klebinger.
Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a7462fb6b8bdd6326a607bbd7b9453eb588193b">9a7462fb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">codeGen: Don't discard live case binders in unsafeEqualityProof logic
Previously CoreToStg would unconditionally discard cases of the form:
case unsafeEqualityProof of wild { _ -> rhs }
and rather replace the whole thing with `rhs`. However, in some cases
(see #18227) the case binder is still live, resulting in unbound
occurrences in `rhs`. Fix this by only discarding the case if the case
binder is dead.
Fixes #18227.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e4137c486a3df66b49395beea7efc6e200cc9bac">e4137c48</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add tests for #18227
T18227A is the original issue which gave rise to the ticket and depends
upon bytestring. T18227B is a minimized reproducer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bab9ff1e09c1566a4105146bd636634a24928b9">8bab9ff1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix rts include and library paths
Fixes two bugs:
* (?) and (<>) associated in a surprising way
* We neglected to include libdw paths in the rts configure flags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd761185561747fe0b3adc22602f75d7b50cd248">bd761185</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-14T15:35:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Drop redundant GHC arguments
Cabal should already be passing this arguments to GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01f7052cc182c0ced85522dc775ebc490bf094ce">01f7052c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-06-14T15:36:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FFI: Fix pass small ints in foreign call wrappers
The Haskell calling convention requires integer parameters smaller
than wordsize to be promoted to wordsize (where the upper bits are
don't care). To access such small integer parameter read a word from
the parameter array and then cast that word to the small integer
target type.
Fixes #15933
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/502647f7583be626319482adf4ea3d905db0006d">502647f7</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-14T15:37:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix "ndecreasingIndentation" in manual (#18116)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a9cc0897b676ffd6612562a46600ea98c53a58d">9a9cc089</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-06-15T13:10:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldl' in unionManyUniqDSets
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/761dcb84cd4c50c6fbb361eb26fb429af87392a3">761dcb84</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-15T13:10:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Load .lo as well.
Some archives contain so called linker objects, with the affectionate
.lo suffic. For example the musl libc.a will come in that form. We
still want to load those objects, hence we should not discard them and
look for .lo as well. Ultimately we might want to fix this proerly by
looking at the file magic.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf01477f03da13caaf78caacc5b001cb46a86685">cf01477f</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-15T13:11:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">User's Guide: KnownNat evidence is Natural
This bit of documentation got outdated after commit
1fcede43d2b30f33b7505e25eb6b1f321be0407f
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0dcbfe646e52d0a1ef6d6e59a059323485775eb">d0dcbfe6</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2020-06-16T20:36:38+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos and formatting in user guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/56a9e95fd6c2f213d676c9a2bd0a6cf93c531dbb">56a9e95f</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2020-06-16T20:36:38+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Resolve TODO
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e884d14102948ad49d75611da247beff25911a4">3e884d14</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2020-06-16T20:36:38+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename TcHoleErrors to GHC.Tc.Errors.Hole
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d23fc67847a27222ad8a0c193e6a10b5a4c0cf48">d23fc678</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-06-17T15:31:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Build with threaded runtime if available
See #16873.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0639dc10e214280a90dd6b75ce86cf43d1eb2286">0639dc10</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T15:31:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">T16190: only measure bytes_allocated
Just adding `{-# LANGUAGE BangPatterns #-}` makes the two other metrics
fluctuate by 13%.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4cab68974dba3e674016514c939946ce60e58273">4cab6897</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-06-17T15:32:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: fix formatting in users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb8115a8c4cbc842b66798480fefc7ab64d31931">eb8115a8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T15:33:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move CLabel assertions into smart constructors (#17957)
It avoids using DynFlags in the Outputable instance of Clabel to check
assertions at pretty-printing time.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7faa4509cd7dbc6e2f873e4997e8888bd6ec3507">7faa4509</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-17T15:43:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Bump to 4.15.0.0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20616959a7f4821034e14a64c3c9bf288c9bc956">20616959</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-17T15:43:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Use grep -q instead of --quiet
The latter is apparently not supported by busybox.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40fa237e1daab7a76b9871bb6c50b953a1addf23">40fa237e</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-17T16:21:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types (#15981)
This is the first step towards implementation of the linear types proposal
(https://github.com/ghc-proposals/ghc-proposals/pull/111).
It features
* A language extension -XLinearTypes
* Syntax for linear functions in the surface language
* Linearity checking in Core Lint, enabled with -dlinear-core-lint
* Core-to-core passes are mostly compatible with linearity
* Fields in a data type can be linear or unrestricted; linear fields
have multiplicity-polymorphic constructors.
If -XLinearTypes is disabled, the GADT syntax defaults to linear fields
The following items are not yet supported:
* a # m -> b syntax (only prefix FUN is supported for now)
* Full multiplicity inference (multiplicities are really only checked)
* Decent linearity error messages
* Linear let, where, and case expressions in the surface language
(each of these currently introduce the unrestricted variant)
* Multiplicity-parametric fields
* Syntax for annotating lambda-bound or let-bound with a multiplicity
* Syntax for non-linear/multiple-field-multiplicity records
* Linear projections for records with a single linear field
* Linear pattern synonyms
* Multiplicity coercions (test LinearPolyType)
A high-level description can be found at
https://ghc.haskell.org/trac/ghc/wiki/LinearTypes/Implementation
Following the link above you will find a description of the changes made to Core.
This commit has been authored by
* Richard Eisenberg
* Krzysztof Gogolewski
* Matthew Pickering
* Arnaud Spiwack
With contributions from:
* Mark Barbone
* Alexander Vershilov
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6cb84c469bf1ab6b03e099f5d100e78800ca09e0">6cb84c46</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Various performance improvements
This implements several general performance improvements to GHC,
to offset the effect of the linear types change.
General optimisations:
- Add a `coreFullView` function which iterates `coreView` on the
head. This avoids making function recursive solely because the
iterate `coreView` themselves. As a consequence, this functions can
be inlined, and trigger case-of-known constructor (_e.g._
`kindRep_maybe`, `isLiftedRuntimeRep`, `isMultiplicityTy`,
`getTyVar_maybe`, `splitAppTy_maybe`, `splitFunType_maybe`,
`tyConAppTyCon_maybe`). The common pattern about all these functions
is that they are almost always used as views, and immediately
consumed by a case expression. This commit also mark them asx `INLINE`.
- In `subst_ty` add a special case for nullary `TyConApp`, which avoid
allocations altogether.
- Use `mkTyConApp` in `subst_ty` for the general `TyConApp`. This
required quite a bit of module shuffling.
case. `myTyConApp` enforces crucial sharing, which was lost during
substitution. See also !2952 .
- Make `subst_ty` stricter.
- In `eqType` (specifically, in `nonDetCmpType`), add a special case,
tested first, for the very common case of nullary `TyConApp`.
`nonDetCmpType` has been made `INLINE` otherwise it is actually a
regression. This is similar to the optimisations in !2952.
Linear-type specific optimisations:
- Use `tyConAppTyCon_maybe` instead of the more complex `eqType` in
the definition of the pattern synonyms `One` and `Many`.
- Break the `hs-boot` cycles between `Multiplicity.hs` and `Type.hs`:
`Multiplicity` now import `Type` normally, rather than from the
`hs-boot`. This way `tyConAppTyCon_maybe` can inline properly in the
`One` and `Many` pattern synonyms.
- Make `updateIdTypeAndMult` strict in its type and multiplicity
- The `scaleIdBy` gets a specialised definition rather than being an
alias to `scaleVarBy`
- `splitFunTy_maybe` is given the type `Type -> Maybe (Mult, Type,
Type)` instead of `Type -> Maybe (Scaled Type, Type)`
- Remove the `MultMul` pattern synonym in favour of a view `isMultMul`
because pattern synonyms appear not to inline well.
- in `eqType`, in a `FunTy`, compare multiplicities last: they are
almost always both `Many`, so it helps failing faster.
- Cache `manyDataConTy` in `mkTyConApp`, to make sure that all the
instances of `TyConApp ManyDataConTy []` are physically the same.
This commit has been authored by
* Richard Eisenberg
* Krzysztof Gogolewski
* Arnaud Spiwack
Metric Decrease:
haddock.base
T12227
T12545
T12990
T1969
T3064
T5030
T9872b
Metric Increase:
haddock.base
haddock.Cabal
haddock.compiler
T12150
T12234
T12425
T12707
T13035
T13056
T15164
T16190
T18304
T1969
T3064
T3294
T5631
T5642
T5837
T6048
T9020
T9233
T9675
T9872a
T9961
WWRec
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57db91d8ee501c7cf176c4bb1e2101d3092fd0f6">57db91d8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove integer-simple
integer-simple uses lists of words (`[Word]`) to represent big numbers
instead of ByteArray#:
* it is less efficient than the newer ghc-bignum native backend
* it isn't compatible with the big number representation that is now
shared by all the ghc-bignum backends (based on the one that was
used only in integer-gmp before).
As a consequence, we simply drop integer-simple
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f96bc127d6231b5e76bbab442244eb303b08867">9f96bc12</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-bignum library
ghc-bignum is a newer package that aims to replace the legacy
integer-simple and integer-gmp packages.
* it supports several backends. In particular GMP is still supported and
most of the code from integer-gmp has been merged in the "gmp"
backend.
* the pure Haskell "native" backend is new and is much faster than the
previous pure Haskell implementation provided by integer-simple
* new backends are easier to write because they only have to provide a
few well defined functions. All the other code is common to all
backends. In particular they all share the efficient small/big number
distinction previously used only in integer-gmp.
* backends can all be tested against the "native" backend with a simple
Cabal flag. Backends are only allowed to differ in performance, their
results should be the same.
* Add `integer-gmp` compat package: provide some pattern synonyms and
function aliases for those in `ghc-bignum`. It is intended to avoid
breaking packages that depend on `integer-gmp` internals.
Update submodules: text, bytestring
Metric Decrease:
Conversions
ManyAlternatives
ManyConstructors
Naperian
T10359
T10547
T10678
T12150
T12227
T12234
T12425
T13035
T13719
T14936
T1969
T4801
T4830
T5237
T5549
T5837
T8766
T9020
parsing001
space_leak_001
T16190
haddock.base
On ARM and i386, T17499 regresses (+6% > 5%).
On x86_64 unregistered, T13701 sometimes regresses (+2.2% > 2%).
Metric Increase:
T17499
T13701
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96aa57878fd6e6a7b92e841a0df8b5255a559c97">96aa5787</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update compiler
Thanks to ghc-bignum, the compiler can be simplified:
* Types and constructors of Integer and Natural can be wired-in. It
means that we don't have to query them from interfaces. It also means
that numeric literals don't have to carry their type with them.
* The same code is used whatever ghc-bignum backend is enabled. In
particular, conversion of bignum literals into final Core expressions
is now much more straightforward. Bignum closure inspection too.
* GHC itself doesn't depend on any integer-* package anymore
* The `integerLibrary` setting is gone.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f67e3447e5a0089b5348940d404ed876fddddfc">0f67e344</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update `base` package
* GHC.Natural isn't implemented in `base` anymore. It is provided by
ghc-bignum in GHC.Num.Natural. It means that we can safely use Natural
primitives in `base` without fearing issues with built-in rewrite
rules (cf #15286)
* `base` doesn't conditionally depend on an integer-* package anymore,
it depends on ghc-bignum
* Some duplicated code in integer-* can now be factored in GHC.Float
* ghc-bignum tries to use a uniform naming convention so most of the
other changes are renaming
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa9e7b7196f03f84579e3b4a09068c668cbe6ffb">aa9e7b71</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update `make` based build system
* replace integer-* package selection with ghc-bignum backend selection
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f817d816e60a487bca64037095c01e9956225b64">f817d816</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update testsuite
* support detection of slow ghc-bignum backend (to replace the detection
of integer-simple use). There are still some test cases that the
native backend doesn't handle efficiently enough.
* remove tests for GMP only functions that have been removed from
ghc-bignum
* fix test results showing dependent packages (e.g. integer-gmp) or
showing suggested instances
* fix test using Integer/Natural API or showing internal names
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dceecb093c3ee1e4dc970bb6669ff855ec37f6ac">dceecb09</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Hadrian
* support ghc-bignum backend selection in flavours and command-line
* support ghc-bignum "--check" flag (compare results of selected backend
against results of the native one) in flavours and command-line (e.g.
pass --bignum=check-gmp" to check the "gmp" backend)
* remove the hack to workaround #15286
* build GMP only when the gmp backend is used
* remove hacks to workaround `text` package flags about integer-*. We
fix `text` to use ghc-bignum unconditionally in another patch
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa4281d672e462b8421098b3506bd3c4c6a1f819">fa4281d6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-17T16:22:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump bytestring and text submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a3f6f348004a80d3d7add81b22e4217b648b145">1a3f6f34</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-06-18T23:03:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: mention -hiedir in docs for -outputdir
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/729bcb02716593ae46d7baecce4776b3f353e3f7">729bcb02</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-18T23:04:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix build on Mac OS Catalina (#17798)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95e18292731cd799e024976f11c18fdf34bcb777">95e18292</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-06-18T23:04:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Relax allocation threshold for T12150.
This test performs little work, so the most minor allocation
changes often cause the test to fail.
Increasing the threshold to 2% should help with this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ce6c393888fad5d52dfe0bff9b72cd1cf9facc0">8ce6c393</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-06-18T23:05:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Bump pinned cabal.project to an existent index-state
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/08c1cb0f30770acbf366423f085f8ef92f7f6a06">08c1cb0f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-06-18T23:06:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix uninitialized field read in Linker.c
Valgrind report of the bug when running the test `linker_unload`:
==29666== Conditional jump or move depends on uninitialised value(s)
==29666== at 0x369C5B4: setOcInitialStatus (Linker.c:1305)
==29666== by 0x369C6C5: mkOc (Linker.c:1347)
==29666== by 0x36C027A: loadArchive_ (LoadArchive.c:522)
==29666== by 0x36C0600: loadArchive (LoadArchive.c:626)
==29666== by 0x2C144CD: ??? (in /home/omer/haskell/ghc_2/testsuite/tests/rts/linker/linker_unload.run/linker_unload)
==29666==
==29666== Conditional jump or move depends on uninitialised value(s)
==29666== at 0x369C5B4: setOcInitialStatus (Linker.c:1305)
==29666== by 0x369C6C5: mkOc (Linker.c:1347)
==29666== by 0x369C9F6: preloadObjectFile (Linker.c:1507)
==29666== by 0x369CA8D: loadObj_ (Linker.c:1536)
==29666== by 0x369CB17: loadObj (Linker.c:1557)
==29666== by 0x3866BC: main (linker_unload.c:33)
The problem is `mkOc` allocates a new `ObjectCode` and calls
`setOcInitialStatus` without initializing the `status` field.
`setOcInitialStatus` reads the field as first thing:
static void setOcInitialStatus(ObjectCode* oc) {
if (oc->status == OBJECT_DONT_RESOLVE)
return;
if (oc->archiveMemberName == NULL) {
oc->status = OBJECT_NEEDED;
} else {
oc->status = OBJECT_LOADED;
}
}
`setOcInitialStatus` is unsed in two places for two different purposes:
in `mkOc` where we don't have the `status` field initialized yet (`mkOc`
is supposed to initialize it), and `loadOc` where we do have `status`
field initialized and we want to update it. Instead of splitting the
function into two functions which are both called just once I inline the
functions in the use sites and remove it.
Fixes #18342
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da18ff9935e72c7fe6127cb5d5d0c53654a204b0">da18ff99</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-06-18T23:07:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix windows bootstrap due to linker changes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2af0ec9059b94e1fa6b37eda60216e0222e1a53d">2af0ec90</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-18T23:07:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: store default depth in SDocContext (#17957)
It avoids having to use DynFlags to reach for pprUserLength.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d4a0be758003f32b9d9d89cfd14b9839ac002f4d">d4a0be75</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-18T23:08:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move tablesNextToCode field into Platform
tablesNextToCode is a platform setting and doesn't belong into DynFlags
(#17957). Doing this is also a prerequisite to fix #14335 where we deal
with two platforms (target and host) that may have different platform
settings.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/809caedffe489931efa8c96a60eaed6d7ff739b9">809caedf</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-06-23T22:47:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch from HscSource to IsBootInterface for module lookup in GhcMake
We look up modules by their name, and not their contents. There is no
way to separately reference a signature vs regular module; you get what
you get. Only boot files can be referenced indepenently with `import {-#
SOURCE #-}`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7750bd456f32c3e91b9165587fe290122b9c2444">7750bd45</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cmm: introduce SAVE_REGS/RESTORE_REGS
We don't want to save both Fn and Dn register sets on x86-64 as they are
aliased to the same arch register (XMMn).
Moreover, when SAVE_STGREGS was used in conjunction with `jump foo [*]`
which makes a set of Cmm registers alive so that they cover all arch
registers used to pass parameter, we could have Fn, Dn and XMMn alive at
the same time. It made the LLVM code generator choke (see #17920).
Now `SAVE_REGS/RESTORE_REGS` and `jump foo [*]` use the same set of
registers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2636794d1a1d0c4c2666d5afb002b0ba73600f8a">2636794d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmToC: don't add extern decl to parsed Cmm data
Previously, if a .cmm file *not in the RTS* contained something like:
```cmm
section "rodata" { msg : bits8[] "Test\n"; }
```
It would get compiled by CmmToC into:
```c
ERW_(msg);
const char msg[] = "Test\012";
```
and fail with:
```
/tmp/ghc32129_0/ghc_4.hc:5:12: error:
error: conflicting types for \u2018msg\u2019
const char msg[] = "Test\012";
^~~
In file included from /tmp/ghc32129_0/ghc_4.hc:3:0: error:
/tmp/ghc32129_0/ghc_4.hc:4:6: error:
note: previous declaration of \u2018msg\u2019 was here
ERW_(msg);
^
/builds/hsyl20/ghc/_build/install/lib/ghc-8.11.0.20200605/lib/../lib/x86_64-linux-ghc-8.11.0.20200605/rts-1.0/include/Stg.h:253:46: error:
note: in definition of macro \u2018ERW_\u2019
#define ERW_(X) extern StgWordArray (X)
^
```
See the rationale for this on https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/compiler/backends/ppr-c#prototypes
Now we don't generate these extern declarations (ERW_, etc.) for
top-level data. It shouldn't change anything for the RTS (the only place
we use .cmm files) as it is already special cased in
`GHC.Cmm.CLabel.needsCDecl`. And hand-written Cmm can use explicit
extern declarations when needed.
Note that it allows `cgrun069` test to pass with CmmToC (cf #15467).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f6a0665512717271ac2b249d107e2a0cb18ae86">5f6a0665</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">LLVM: refactor and comment register padding code (#17920)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cad62ef11972490b180fad3cd4a5c7754fa218e4">cad62ef1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:48:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for #17920
Metric Decrease:
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2a9006b068ba9af9d41711307a8d597d2bb03d7">a2a9006b</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-06-23T22:48:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix issue #18262 by zonking constraints after solving
Zonk residual constraints in checkForExistence to reveal user type
errors.
Previously when `:instances` was used with instances that have TypeError
constraints the result would look something like:
instance [safe] s0 => Err 'A -- Defined at ../Bug2.hs:8:10
whereas after zonking, `:instances` now sees the `TypeError` and
properly eliminates the constraint from the results.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/181516bcd6f18f22e1df3915bfca0c36524a725b">181516bc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-23T22:49:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a buglet in Simplify.simplCast
This bug, revealed by #18347, is just a missing update to
sc_hole_ty in simplCast. I'd missed a code path when I
made the recentchanges in
commit 6d49d5be904c0c01788fa7aae1b112d5b4dfaf1c
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date: Thu May 21 12:53:35 2020 +0100
Implement cast worker/wrapper properly
The fix is very easy.
Two other minor changes
* Tidy up in SimpleOpt.simple_opt_expr. In fact I think this is an
outright bug, introduced in the fix to #18112: we were simplifying
the same coercion twice *with the same substitution*, which is just
wrong. It'd be a hard bug to trigger, so I just fixed it; less code
too.
* Better debug printing of ApplyToVal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/625a7f5465d51d054c6930772412bad7d87189c5">625a7f54</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-23T22:50:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Two small tweaks to Coercion.simplifyArgsWorker
These tweaks affect the inner loop of simplifyArgsWorker, which
in turn is called from the flattener in Flatten.hs. This is
a key perf bottleneck to T9872{a,b,c,d}.
These two small changes have a modest but useful benefit.
No change in functionality whatsoever.
Relates to #18354
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5768cce0214e20937f8e1d41ef1d9b5613b02ae">b5768cce</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:50:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use timesInt2# with GHC < 8.11 (fix #18358)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ad4085c22a8d5030545cc9e0fedd0784836ecbf">7ad4085c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-23T22:51:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix invalid printf format
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a1f34d37b47826e86343e368a5c00f1a4b1f2bce">a1f34d37</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-23T22:52:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing entry to freeNamesItem (#18369)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/03a708ba8e8c323b07d8d2e0115d6eb59987cc02">03a708ba</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-06-25T03:54:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable large address space optimization on windows.
Starting with Win 8.1/Server 2012 windows no longer preallocates
page tables for reserverd memory eagerly, which prevented us from
using this approach in the past.
We also try to allocate the heap high in the memory space.
Hopefully this makes it easier to allocate things in the low
4GB of memory that need to be there. Like jump islands for the
linker.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e6d3d09d983337df30d12e5aaa96bae9b81b324">7e6d3d09</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-06-25T03:54:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">In `:break ident` allow out of scope and nested identifiers (Fix #3000)
This patch fixes the bug and implements the feature request of #3000.
1. If `Module` is a real module name and `identifier` a name of a
top-level function in `Module` then `:break Module.identifer` works
also for an `identifier` that is out of scope.
2. Extend the syntax for `:break identifier` to:
:break [ModQual.]topLevelIdent[.nestedIdent]...[.nestedIdent]
`ModQual` is optional and is either the effective name of a module or
the local alias of a qualified import statement.
`topLevelIdent` is the name of a top level function in the module
referenced by `ModQual`.
`nestedIdent` is optional and the name of a function nested in a let or
where clause inside the previously mentioned function `nestedIdent` or
`topLevelIdent`.
If `ModQual` is a module name, then `topLevelIdent` can be any top level
identifier in this module. If `ModQual` is missing or a local alias of a
qualified import, then `topLevelIdent` must be in scope.
Breakpoints can be set on arbitrarily deeply nested functions, but the
whole chain of nested function names must be specified.
3. To support the new functionality rewrite the code to tab complete `:break`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30e42652ed895c3ed086e7834be46f93ba1cc61b">30e42652</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">make: Respect XELATEX variable
Previously we simply ignored the XELATEX variable when building
PDF documentation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4acc2934952f4849c2082015d9bebef446d46545">4acc2934</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/make: Detect makeindex
Previously we would simply assume that makeindex was available.
Now we correctly detect it in `configure` and respect this conclusion in
hadrian and make.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d61f866b43d3385be3a8521ba24503c13e8d404">0d61f866</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-25T03:54:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expunge GhcTcId
GHC.Hs.Extension had
type GhcPs = GhcPass 'Parsed
type GhcRn = GhcPass 'Renamed
type GhcTc = GhcPass 'Typechecked
type GhcTcId = GhcTc
The last of these, GhcTcId, is a vestige of the past.
This patch expunges it from GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ddbed4ad1772ac7dfc96b352a3dc35d958a5f9b">8ddbed4a</a></strong>
<div>
<span>by Adam Wespiser</span>
<i>at 2020-06-25T03:54:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add examples to Data.Traversable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/284001d00995c82a1f2b38f696138ad683b5364b">284001d0</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-06-25T03:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export readBinIface_
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90f438724dbc1ef9e4b371034d44170738fe3224">90f43872</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-06-25T03:54:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export everything from HsToCore.
This lets us reuse these functions in haddock, avoiding synchronization bugs.
Also fixed some divergences with haddock in that file
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7dd6da7e066872a949be7c914cc700182307cd2">c7dd6da7</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-25T03:54:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up haddock hyperlinks of GHC.* (part1)
This updates haddock comments only.
This patch focuses to update for hyperlinks in GHC API's haddock comments,
because broken links especially discourage newcomers.
This includes the following hierarchies:
- GHC.Hs.*
- GHC.Core.*
- GHC.Stg.*
- GHC.Cmm.*
- GHC.Types.*
- GHC.Data.*
- GHC.Builtin.*
- GHC.Parser.*
- GHC.Driver.*
- GHC top
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1eb997a84669f158de9dd16a9e54d279cec22293">1eb997a8</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-25T03:54:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up haddock hyperlinks of GHC.* (part2)
This updates haddock comments only.
This patch focuses to update for hyperlinks in GHC API's haddock comments,
because broken links especially discourage newcomers.
This includes the following hierarchies:
- GHC.Iface.*
- GHC.Llvm.*
- GHC.Rename.*
- GHC.Tc.*
- GHC.HsToCore.*
- GHC.StgToCmm.*
- GHC.CmmToAsm.*
- GHC.Runtime.*
- GHC.Unit.*
- GHC.Utils.*
- GHC.SysTools.*
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67a86b4d4d21954bae7aaddec7617228025a8270">67a86b4d</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-06-25T03:54:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add MonadZip and MonadFix instances for Complex
These instances are taken from
https://hackage.haskell.org/package/linear-1.21/docs/Linear-Instances.html
They are the unique possible, so let they be in `base`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c50ef26edaa537c0a13ac1a574632f9078c5671b">c50ef26e</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-06-25T03:54:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">test suite: add reproducer for #17516
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe281b27d544920a2c2ddc00f6284006b85ab294">fe281b27</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-06-25T03:54:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable maxBound checks for OverloadedLists (Fixes #18172)
Consider the Literal `[256] :: [Data.Word.Word8]`
When the `OverloadedLists` extension is not active, then the `ol_ext` field
in the `OverLitTc` record that is passed to the function `getIntegralLit`
contains the type `Word8`. This is a simple type, and we can use its
type constructor immediately for the `warnAboutOverflowedLiterals` function.
When the `OverloadedLists` extension is active, then the `ol_ext` field
contains the type family `Item [Word8]`. The function `nomaliseType` is used
to convert it to the needed type `Word8`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a788d4d17ad332dbfbe08e6822c52ae0de6ef496">a788d4d1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Hash: Simplify freeing of HashListChunks
While looking at #18348 I noticed that the treatment of HashLists are a
bit more complex than necessary (which lead to some initial confusion on
my part). Specifically, we allocate HashLists in chunks. Each chunk
allocation makes two allocations: one for the chunk itself and one for a
HashListChunk to link together the chunks for the purposes of freeing.
Simplify this (and hopefully make the relationship between these
clearer) but allocating the HashLists and HashListChunk in a single
malloc. This will both make the implementation easier to follow and
reduce C heap fragmentation.
Note that even after this patch we fail to bound the size of the free
HashList pool. However, this is a separate bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3c2d59bafe253dd7e4966a46564fb16acb1af5c">d3c2d59b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-25T03:54:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: avoid overflow on 32-bit arch (#18375)
We're now correctly computing allocated bytes on 32-bit arch, so we get
huge increases.
Metric Increase:
haddock.Cabal
haddock.base
haddock.compiler
space_leak_001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a3d69dc6c2134afe239caf4f881ba5542d2c2be0">a3d69dc6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-06-25T23:06:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Core.Unify: Make UM actions one-shot by default
This MR makes the UM monad in GHC.Core.Unify into a one-shot
monad. See the long Note [The one-shot state monad trick].
See also #18202 and !3309, which applies this to all Reader/State-like
monads in GHC for compile-time perf improvements. The pattern used
here enables something similar to the state-hack, but is applicable to
user-defined monads, not just `IO`.
Metric Decrease 'runtime/bytes allocated' (test_env='i386-linux-deb9'):
haddock.Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ee58f8d900884ac8b721b6b95dbfa6500f39431">9ee58f8d</a></strong>
<div>
<span>by Matthias Pall Gissurarson</span>
<i>at 2020-06-26T17:12:45+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement the proposed -XQualifiedDo extension
Co-authored-by: Facundo Domínguez <facundo.dominguez@tweag.io>
QualifiedDo is implemented using the same placeholders for operation names in
the AST that were devised for RebindableSyntax. Whenever the renamer checks
which names to use for do syntax, it first checks if the do block is qualified
(e.g. M.do { stmts }), in which case it searches for qualified names in
the module M.
This allows users to write
{-# LANGUAGE QualifiedDo #-}
import qualified SomeModule as M
f x = M.do -- desugars to:
y <- M.return x -- M.return x M.>>= \y ->
M.return y -- M.return y M.>>
M.return y -- M.return y
See Note [QualifiedDo] and the users' guide for more details.
Issue #18214
Proposal:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0216-qualified-do.rst
Since we change the constructors `ITdo` and `ITmdo` to carry the new module
name, we need to bump the haddock submodule to account or the new shape of
these constructors.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce987865d7594ecbcb3d27435eef773e95b2db85">ce987865</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-27T11:55:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revamp the treatment of auxiliary bindings for derived instances
This started as a simple fix for #18321 that organically grew into a
much more sweeping refactor of how auxiliary bindings for derived
instances are handled. I have rewritten `Note [Auxiliary binders]`
in `GHC.Tc.Deriv.Generate` to explain all of the moving parts, but
the highlights are:
* Previously, the OccName of each auxiliary binding would be given
a suffix containing a hash of its package name, module name, and
parent data type to avoid name clashes. This was needlessly
complicated, so we take the more direct approach of generating
`Exact` `RdrName`s for each auxiliary binding with the same
`OccName`, but using an underlying `System` `Name` with a fresh
`Unique` for each binding. Unlike hashes, allocating new `Unique`s
does not require any cleverness and avoid name clashes all the
same...
* ...speaking of which, in order to convince the renamer that multiple
auxiliary bindings with the same `OccName` (but different
`Unique`s) are kosher, we now use `rnLocalValBindsLHS` instead of
`rnTopBindsLHS` to rename auxiliary bindings. Again, see
`Note [Auxiliary binders]` for the full story.
* I have removed the `DerivHsBind` constructor for
`DerivStuff`—which was only used for `Data.Data`-related
auxiliary bindings—and refactored `gen_Data_binds` to use
`DerivAuxBind` instead. This brings the treatment of
`Data.Data`-related auxiliary bindings in line with every other
form of auxiliary binding.
Fixes #18321.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a403eb917bd26caf96c29d67bfe91163b593b2c9">a403eb91</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-27T11:55:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-bignum: fix division by zero (#18359)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b3d13b68c95ef9bbeca4437028531d184abcbea">1b3d13b6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-27T11:55:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix ghc-bignum exceptions
We must ensure that exceptions are not simplified. Previously we used:
case raiseDivZero of
_ -> 0## -- dummyValue
But it was wrong because the evaluation of `raiseDivZero` was removed and
the dummy value was directly returned. See new Note [ghc-bignum exceptions].
I've also removed the exception triggering primops which were fragile.
We don't need them to be primops, we can have them exported by ghc-prim.
I've also added a test for #18359 which triggered this patch.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a74ec37c9d7679a5563ab86a8759c79c3c5de6f0">a74ec37c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-27T11:56:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Better loop detection in findTypeShape
Andreas pointed out, in !3466, that my fix for #18304 was not
quite right. This patch fixes it properly, by having just one
RecTcChecker rather than (implicitly) two nested ones, in
findTypeShape.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a04020b88d4935d675f989806aff251f459561e9">a04020b8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-27T11:57:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't store buildTag
`DynFlags.buildTag` was a field created from the set of Ways in
`DynFlags.ways`. It had to be kept in sync with `DynFlags.ways` which
was fragile. We want to avoid global state like this (#17957).
Moreover in #14335 we also want to support loading units with different
ways: target units would still use `DynFlags.ways` but plugins would use
`GHC.Driver.Ways.hostFullWays`. To avoid having to deal both with build
tag and with ways, we recompute the buildTag on-the-fly (should be
pretty cheap) and we remove `DynFlags.buildTag` field.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e83efa24636c72811e4c79fe1c7e4f7cf3170cd">0e83efa2</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-06-27T11:57:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't generalize when typechecking a tuple section
The code is simpler and cleaner.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8ba9e6f951a2f8c6e2429a8b2dcb035c392908f">d8ba9e6f</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-06-28T09:19:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: Refactor Haskell-C glue for PPC 64-bit
Make sure the stack is 16 byte aligned even when reserved stack
bytes are not a multiple of 16 bytes.
Avoid saving r2 (TOC). On ELF v1 the function descriptor of StgReturn
has the same TOC as StgRun, on ELF v2 the TOC is recomputed in the
function prologue.
Use the ABI provided functions to save clobbered GPRs and FPRs.
Improve comments. Describe what the stack looks like and how it relates
to the respective ABIs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42f797b0ad034a92389e7081aa50ef4ab3434d01">42f797b0</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-28T09:19:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use NHsCoreTy to embed types into GND-generated code
`GeneralizedNewtypeDeriving` is in the unique situation where it must
produce an `LHsType GhcPs` from a Core `Type`. Historically, this was
done with the `typeToLHsType` function, which walked over the entire
`Type` and attempted to construct an `LHsType` with the same overall
structure. `typeToLHsType` is quite complicated, however, and has
been the subject of numerous bugs over the years (e.g., #14579).
Luckily, there is an easier way to accomplish the same thing: the
`XHsType` constructor of `HsType`. `XHsType` bundles an `NHsCoreTy`,
which allows embedding a Core `Type` directly into an `HsType`,
avoiding the need to laboriously convert from one to another (as
`typeToLHsType` did). Moreover, renaming and typechecking an
`XHsType` is simple, since one doesn't need to do anything to a
Core `Type`...
...well, almost. For the reasons described in
`Note [Typechecking NHsCoreTys]` in `GHC.Tc.Gen.HsType`, we must
apply a substitution that we build from the local `tcl_env` type
environment. But that's a relatively modest price to pay.
Now that `GeneralizedNewtypeDeriving` uses `NHsCoreTy`, the
`typeToLHsType` function no longer has any uses in GHC, so this patch
rips it out. Some additional tweaks to `hsTypeNeedsParens` were
necessary to make the new `-ddump-deriv` output correctly
parenthesized, but other than that, this patch is quite
straightforward.
This is a mostly internal refactoring, although it is likely that
`GeneralizedNewtypeDeriving`-generated code will now need fewer
language extensions in certain situations than it did before.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68530b1cd45629e5a353a37df80195ac54d26ade">68530b1c</a></strong>
<div>
<span>by Jan Hrček</span>
<i>at 2020-06-28T09:20:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix duplicated words and typos in comments and user guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15b79befc246aa9c63dd084012dc7843ea93daaa">15b79bef</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-28T09:20:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add integer-gmp's ghc.mk and GNUmakefile to .gitignore
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfa5698b1ab0190820a2df19487d3d72d3a7924d">bfa5698b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-28T09:21:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a typo in Lint
This simple error in GHC.Core.Litn.lintJoinLams meant that
Lint reported bogus errors.
Fixes #18399
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71006532abb88a53df7c7e0b3a5e2c8af99a48d1">71006532</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-30T07:10:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reject nested foralls/contexts in instance types more consistently
GHC is very wishy-washy about rejecting instance declarations with
nested `forall`s or contexts that are surrounded by outermost
parentheses. This can even lead to some strange interactions with
`ScopedTypeVariables`, as demonstrated in #18240. This patch makes
GHC more consistently reject instance types with nested
`forall`s/contexts so as to prevent these strange interactions.
On the implementation side, this patch tweaks `splitLHsInstDeclTy`
and `getLHsInstDeclHead` to not look through parentheses, which can
be semantically significant. I've added a
`Note [No nested foralls or contexts in instance types]` in
`GHC.Hs.Type` to explain why. This also introduces a
`no_nested_foralls_contexts_err` function in `GHC.Rename.HsType` to
catch nested `forall`s/contexts in instance types. This function is
now used in `rnClsInstDecl` (for ordinary instance declarations) and
`rnSrcDerivDecl` (for standalone `deriving` declarations), the latter
of which fixes #18271.
On the documentation side, this adds a new
"Formal syntax for instance declaration types" section to the GHC
User's Guide that presents a BNF-style grammar for what is and isn't
allowed in instance types.
Fixes #18240. Fixes #18271.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bccf3351a28638fba94953c4bb244ecfc3a1a044">bccf3351</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-30T07:10:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add ghc-bignum to 8.12 release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/81704a6f3b155b0bfbc20f53cd821be3cb9006a7">81704a6f</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2020-06-30T07:10:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update ssh keys in CI performance metrics upload script
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85310fb83fdb7d7294bd453026102fc42000bf14">85310fb8</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-06-30T07:10:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing Ix instances for tuples of size 6 through 15 (#16643)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cbb6b62f54c77637e29bc66e3d1214541c347753">cbb6b62f</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-01T15:41:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement -XLexicalNegation (GHC Proposal #229)
This patch introduces a new extension, -XLexicalNegation, which detects
whether the minus sign stands for negation or subtraction using the
whitespace-based rules described in GHC Proposal #229.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb5a0d01d575cdb830918a6a0406f385de2749c2">fb5a0d01</a></strong>
<div>
<span>by Martin Handley</span>
<i>at 2020-07-01T15:42:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">#17169: Clarify Fixed's Enum instance.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b316804dbafe1d0287fd33f656b7ce5711ec34f7">b316804d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-01T15:42:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve debug tracing for substitution
This patch improves debug tracing a bit (#18395)
* Remove the ancient SDoc argument to substitution, replacing it
with a HasDebugCallStack constraint. The latter does the same
job (indicate the call site) but much better.
* Add HasDebugCallStack to simpleOptExpr, exprIsConApp_maybe
I needed this to help nail the lookupIdSubst panic in
#18326, #17784
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5c9fabb82b39aed9e61c6b78c72312b20a568c68">5c9fabb8</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-01T15:43:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add most common return values for `os` and `arch`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/76d8cc744977d98f6a427b1816198709e2d2e856">76d8cc74</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-01T15:44:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Desugar quoted uses of DerivingVia and expression type signatures properly
The way that `GHC.HsToCore.Quote` desugared quoted `via` types (e.g.,
`deriving via forall a. [a] instance Eq a => Eq (List a)`) and
explicit type annotations in signatures (e.g.,
`f = id @a :: forall a. a -> a`) was completely wrong, as it did not
implement the scoping guidelines laid out in
`Note [Scoped type variables in bindings]`. This is easily fixed.
While I was in town, I did some minor cleanup of related Notes:
* `Note [Scoped type variables in bindings]` and
`Note [Scoped type variables in class and instance declarations]`
say very nearly the same thing. I decided to just consolidate the
two Notes into `Note [Scoped type variables in quotes]`.
* `Note [Don't quantify implicit type variables in quotes]` is
somewhat outdated, as it predates GHC 8.10, where the
`forall`-or-nothing rule requires kind variables to be explicitly
quantified in the presence of an explicit `forall`. As a result,
the running example in that Note doesn't even compile. I have
changed the example to something simpler that illustrates the
same point that the original Note was making.
Fixes #18388.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44d6a3352d708785b75aeb616bfc7efff839184e">44d6a335</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-02T02:54:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">T16012: Be verbose on failure.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f985333002c1690bf49debcc64fc65ed1d1de244">f9853330</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-02T02:55:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump ghc-prim version to 0.7.0
Fixes #18279. Bumps the `text` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/23e4e04700f840e3c4e75ccb2085aea05bfb5318">23e4e047</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-02T10:46:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix PowerPC64le support (#17601)
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cdd8d69f5c1d63137b9b56992bb9b74a6785459">3cdd8d69</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-02T10:47:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NCG: correctly handle addresses with huge offsets (#15570)
Before this patch we could generate addresses of this form:
movzbl cP0_str+-9223372036854775808,%eax
The linker can't handle them because the offset is too large:
ld.lld: error: Main.o:(.text+0xB3): relocation R_X86_64_32S out of range: -9223372036852653050 is not in [-2147483648, 2147483647]
With this patch we detect those cases and generate:
movq $-9223372036854775808,%rax
addq $cP0_str,%rax
movzbl (%rax),%eax
I've also refactored `getAmode` a little bit to make it easier to
understand and to trace.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d90b3ff02002ea25460d087dde56f69a9641096">4d90b3ff</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2020-07-02T20:07:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">No need for CURSES_INCLUDE_DIRS
This is a leftover from ef63ff27251a20ff11e58c9303677fa31e609a88</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f08d6316d3d19b627550d99b4364e9bf0b45c329">f08d6316</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-02T20:08:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace Opt_SccProfilingOn flag with sccProfilingEnabled helper function
SCC profiling was enabled in a convoluted way: if WayProf was enabled,
Opt_SccProfilingOn general flag was set (in
`GHC.Driver.Ways.wayGeneralFlags`), and then this flag was queried in
various places.
There is no need to go via general flags, so this patch defines a
`sccProfilingEnabled :: DynFlags -> Bool` helper function that just
checks whether WayProf is enabled.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cc7274b8de254c7266b61fadbc6795dc37bd1e9">8cc7274b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-03T02:49:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/ProfHeap: Only allocate the Censuses that we need
When not LDV profiling there is no reason to allocate 32 Censuses; one
will do. This is a very small memory footprint optimisation, but it
comes for free.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b835112cbeaa6e34a8bae7b7697bdf2826edaa9a">b835112c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-03T02:49:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/ProfHeap: Free old allocations when reinitialising Censuses
Previously when not LDV profiling we would repeatedly reinitialise
`censuses[0]` with `initEra`. This failed to free the `Arena` and
`HashTable` from the old census, resulting in a memory leak.
Fixes #18348.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34be6523a220b2be972b391d8ad26b75f7c26eb1">34be6523</a></strong>
<div>
<span>by Valery Tolstov</span>
<i>at 2020-07-03T02:50:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mention flags that are not enabled by -Wall (#18372)
* Mention missing flags that are not actually enabled by -Wall (docs/users_guide/using-warnings.rst)
* Additionally remove -Wmissing-monadfail-instances from the list of flags enabled by -Wcompat, as it is not the case since 8.8
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edc8d22b2eea5d43dd6c3d0e4b2f85fc02ffa5ce">edc8d22b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-03T02:50:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">LLVM: support R9 and R10 registers
d535ef006d85dbdb7cda2b09c5bc35cb80108909 allowed the use of up to 10
vanilla registers but didn't update LLVM backend to support them. This
patch fixes it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58">4bf18646</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-03T08:37:42+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve handling of data type return kinds
Following a long conversation with Richard, this patch tidies up the
handling of return kinds for data/newtype declarations (vanilla,
family, and instance).
I have substantially edited the Notes in TyCl, so they would
bear careful reading.
Fixes #18300, #18357
In GHC.Tc.Instance.Family.newFamInst we were checking some Lint-like
properties with ASSSERT. Instead Richard and I have added
a proper linter for axioms, and called it from lintGblEnv, which in
turn is called in tcRnModuleTcRnM
New tests (T18300, T18357) cause an ASSERT failure in HEAD.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41d2649288a5debcb4c8003e54b7d3072ab951c5">41d26492</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-03T17:33:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: avoid the use of sdocWithDynFlags in GHC.Core.Rules (#17957)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7aa6ef110d8cc6626b1cf18d85a37cbac53e2795">7aa6ef11</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-03T17:34:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add the __GHC_FULL_VERSION__ CPP macro to expose the full GHC version
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e61d539527a7398017f759c67621ba18a15878f7">e61d5395</a></strong>
<div>
<span>by Chaitanya Koparkar</span>
<i>at 2020-07-07T13:55:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-prim: Turn some comments into haddocks
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37743f91a3f5018a8894ca6d35e8b423e4e08b50">37743f91</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Support `timesInt2#` in LLVM backend
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/46397e530e1b107c6b8932f7ca79ebab53a3249a">46397e53</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`genericIntMul2Op`: Call `genericWordMul2Op` directly
This unblocks a refactor, and removes partiality. It might be a PowerPC
regression but that should be fixable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a1c0584da40d0f8d1ffd01796efcce3b3d0820d">8a1c0584</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify `PrimopCmmEmit`
Follow @simonpj's suggestion of pushing the "into regs" logic into
`emitPrimOp`. With the previous commit getting rid of the recursion in
`genericIntMul2Op`, this is now an easy refactor.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6607f203fb9ad11af1463145810e1bd3c6c4f2c8">6607f203</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`opAllDone` -> `opIntoRegs`
The old name was and terrible and became worse after the previous
commit's refactor moved non-trivial funcationlity into its body.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdcc53babbd6c878344d2a3395bbd619428bd2dd">fdcc53ba</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimise genericIntMul2Op
We shouldn't directly call 'genericWordMul2Op' in genericIntMul2Op
because a target may provide a faster primop for 'WordMul2Op': we'd
better use it!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/686e72253aed3880268dd6858eadd8c320f09e97">686e7225</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-07T13:56:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[linker/rtsSymbols] More linker symbols
Mostly symbols needed for aarch64/armv7l
and in combination with musl, where we have
to rely on loading *all* objects/archives
- __stack_chk_* only when not DYNAMIC
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f60b94de1f460ca3f689152860b108a19ce193e">3f60b94d</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-07T13:56:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">better if guards.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7abffced01f5680efafe44f6be2733eab321b039">7abffced</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-07T13:56:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix (1)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdfeb3f24f76e8fd30452016676e56fbc827789a">cdfeb3f2</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-07T13:56:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">AArch32 symbols only on aarch32.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f496c9550098ffaa3bf25a3447c138626d79bae0">f496c955</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-07T13:56:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add -flink-rts flag to link the rts when linking a shared or static library #18072
By default we don't link the RTS when linking shared libraries because in the
most usual mode a shared library is an intermediary product, for example a
Haskell library, that will be linked into some executable in the end. So we
wish to defer the RTS flavour to link to the final link.
However sometimes the final product is the shared library, for example when
writing a plugin for some other system, so we do wish the shared library to
link the RTS.
For consistency we also make -staticlib honor this flag and its inversion.
-staticlib currently implies -flink-shared.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c59faf67fec83c98ffd1b65f1be0775b34f36595">c59faf67</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-07T13:56:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: link check-ppr against debugging RTS if ghcDebugged
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0effc57d48ace6b719a9f4cbeac67c95ad55010b">0effc57d</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-07T13:56:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts linker: teach the linker about GLIBC's special handling of *stat, mknod and atexit functions #7072
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9615343363a68313c4bfdb068696002ecca7786e">96153433</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-07T13:56:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: make hadrian/ghci use the bootstrap compiler from configure #18190
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d24f886a428e95eb5e962294c77b12bffa40a52">4d24f886</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-07T13:56:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: ignore cabal configure verbosity related flags #18131
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7332bbffee9e2a712508540200eb52ed3d227426">7332bbff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-07T13:56:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Widen T12234 acceptance window to 2%
Previously it wasn't uncommon to see +/-1% fluctuations in compiler
allocations on this test.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/180b63136f25d9fedb764cb9bc23637e7781ed4e">180b6313</a></strong>
<div>
<span>by Gabor Greif</span>
<i>at 2020-07-07T13:56:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">When running libtool, report it as such</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3bd68978476487591fc60f7feb7cfb36b8fc3a3">d3bd6897</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">BigNum: rename BigNat types
Before this patch BigNat names were confusing because we had:
* GHC.Num.BigNat.BigNat: unlifted type used everywhere else
* GHC.Num.BigNat.BigNatW: lifted type only used to share static constants
* GHC.Natural.BigNat: lifted type only used for backward compatibility
After this patch we have:
* GHC.Num.BigNat.BigNat#: unlifted type
* GHC.Num.BigNat.BigNat: lifted type (reexported from GHC.Natural)
Thanks to @RyanGlScott for spotting this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/929d26db3080ec49ab67690952a316fc082b479f">929d26db</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: don't build ghc-bignum with stage0
Noticed by @Ericson2314
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d25b6851bbd63b6a65fb7cd08b37c6bc74df9855">d25b6851</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: ghc-gmp.h shouldn't be a compiler dependency
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ddae2ba979ac2e01d7d9f6b79a9559fbfde46ea">0ddae2ba</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-07T13:56:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: factor out pprUnitId from "Outputable UnitId" instance
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/204f3f5ddec56403bfb12e74291b3b1d14824138">204f3f5d</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-07T13:56:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused function pprHsForAllExtra (#18423)
The function `pprHsForAllExtra` was called only on `Nothing`
since 2015 (1e041b7382b6aa).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3033e0e4940e6ecc43f478f1dcfbd0c3cb1e3ef8">3033e0e4</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-07-08T20:36:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: add flag to skip rebuilding dependency information #17636
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7de4b960a1024adcd0bded6bd320a90979d7ab8">b7de4b96</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-09T09:49:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GHCi :print on big-endian platforms
On big-endian platforms executing
import GHC.Exts
data Foo = Foo Float# deriving Show
foo = Foo 42.0#
foo
:print foo
results in an arithmetic overflow exception which is caused by function
index where moveBytes equals
word_size - (r + item_size_b) * 8
Here we have a mixture of units. Both, word_size and item_size_b have
unit bytes whereas r has unit bits. On 64-bit platforms moveBytes
equals then
8 - (0 + 4) * 8
which results in a negative and therefore invalid second parameter for a
shiftL operation.
In order to make things more clear the expression
(word .&. (mask `shiftL` moveBytes)) `shiftR` moveBytes
is equivalent to
(word `shiftR` moveBytes) .&. mask
On big-endian platforms the shift must be a left shift instead of a
right shift. For symmetry reasons not a mask is used but two shifts in
order to zero out bits. Thus the fixed version equals
case endian of
BigEndian -> (word `shiftL` moveBits) `shiftR` zeroOutBits `shiftL` zeroOutBits
LittleEndian -> (word `shiftR` moveBits) `shiftL` zeroOutBits `shiftR` zeroOutBits
Fixes #16548 and #14455
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3656dff8259199d0dab2d1a1f1b887c252a9c1a3">3656dff8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-09T09:50:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">LLVM: fix MO_S_Mul2 support (#18434)
The value indicating if the carry is useful wasn't taken into account.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d9f095060b0f00d7140f8b0858b7a5dcbffea9ef">d9f09506</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-10T10:33:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define multiShotIO and use it in mkSplitUniqueSupply
This patch is part of the ongoing eta-expansion saga;
see #18238.
It implements a neat trick (suggested by Sebastian Graf)
that allows the programmer to disable the default one-shot behaviour
of IO (the "state hack"). The trick is to use a new multiShotIO
function; see Note [multiShotIO]. For now, multiShotIO is defined
here in Unique.Supply; but it should ultimately be moved to the IO
library.
The change is necessary to get good code for GHC's unique supply;
see Note [Optimising the unique supply].
However it makes no difference to GHC as-is. Rather, it makes
a difference when a subsequent commit
Improve eta-expansion using ArityType
lands.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bce695cc97cadbc3eced5b53efaaa0ecfd201d61">bce695cc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-10T10:33:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make arityType deal with join points
As Note [Eta-expansion and join points] describes,
this patch makes arityType deal correctly with join points.
What was there before was not wrong, but yielded lower
arities than it could.
Fixes #18328
In base GHC this makes no difference to nofib.
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
n-body -0.1% -0.1% -1.2% -1.1% 0.0%
--------------------------------------------------------------------------------
Min -0.1% -0.1% -55.0% -56.5% 0.0%
Max -0.0% 0.0% +16.1% +13.4% 0.0%
Geometric Mean -0.0% -0.0% -30.1% -31.0% -0.0%
But it starts to make real difference when we land the change to the
way mkDupableAlts handles StrictArg, in fixing #13253 and friends.
I think this is because we then get more non-inlined join points.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b7c71cb79095a10b9a5964a5a0676a2a196e92d">2b7c71cb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-11T12:17:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve eta-expansion using ArityType
As #18355 shows, we were failing to preserve one-shot info when
eta-expanding. It's rather easy to fix, by using ArityType more,
rather than just Arity.
This patch is important to suport the one-shot monad trick;
see #18202. But the extra tracking of one-shot-ness requires
the patch
Define multiShotIO and use it in mkSplitUniqueSupply
If that patch is missing, ths patch makes things worse in
GHC.Types.Uniq.Supply. With it, however, we see these improvements
T3064 compiler bytes allocated -2.2%
T3294 compiler bytes allocated -1.3%
T12707 compiler bytes allocated -1.3%
T13056 compiler bytes allocated -2.2%
Metric Decrease:
T3064
T3294
T12707
T13056
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de139cc496c0e0110e252a1208ae346f47f8061e">de139cc4</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-07-12T02:53:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add reproducer for #15630
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4de6a7a5c6433ae8c4df8a9fa09fbd9f3bbd0bf">c4de6a7a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-12T02:53:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Give Uniq[D]FM a phantom type for its key.
This fixes #17667 and should help to avoid such issues going forward.
The changes are mostly mechanical in nature. With two notable
exceptions.
* The register allocator.
The register allocator references registers by distinct uniques.
However they come from the types of VirtualReg, Reg or Unique in
various places. As a result we sometimes cast the key type of the
map and use functions which operate on the now typed map but take
a raw Unique as actual key. The logic itself has not changed it
just becomes obvious where we do so now.
* <Type>Env Modules.
As an example a ClassEnv is currently queried using the types `Class`,
`Name`, and `TyCon`. This is safe since for a distinct class value all
these expressions give the same unique.
getUnique cls
getUnique (classTyCon cls)
getUnique (className cls)
getUnique (tcName $ classTyCon cls)
This is for the most part contained within the modules defining the
interface. However it requires us to play dirty when we are given a
`Name` to lookup in a `UniqFM Class a` map. But again the logic did
not change and it's for the most part hidden behind the Env Module.
Some of these cases could be avoided by refactoring but this is left
for future work.
We also bump the haddock submodule as it uses UniqFM.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2cfdfde20d0d6c0e16aa7a84d8ebe51501bcfa8">c2cfdfde</a></strong>
<div>
<span>by Aaron Allen</span>
<i>at 2020-07-13T09:00:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Warn about empty Char enumerations (#18402)
Currently the "Enumeration is empty" warning (-Wempty-enumerations)
only fires for numeric literals. This patch adds support for `Char`
literals so that enumerating an empty list of `Char`s will also
trigger the warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3ac87ece2716b83ad886e81c20f4161e8ec0efd">c3ac87ec</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-13T09:01:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: build check-ppr dynamic if GHC is build dynamic
Fixes #18361
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ad072b487fe528947f817b0417933a6cd1941b7">9ad072b4</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-13T14:52:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use dumpStyle when printing inlinings
This just makes debug-printing consistent,
and more informative.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e78c4efb8735eb97f17e7b4ca35e305b0766f78a">e78c4efb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-13T14:52:49-04:00</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/7ccb760b1a8034b28171d7540712fd195f65d1fd">7ccb760b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-13T14:52:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reduce result discount in conSize
Ticket #18282 showed that the result discount given by conSize
was massively too large. This patch reduces that discount to
a constant 10, which just balances the cost of the constructor
application itself.
Note [Constructor size and result discount] elaborates, as
does the ticket #18282.
Reducing result discount reduces inlining, which affects perf. I
found that I could increase the unfoldingUseThrehold from 80 to 90 in
compensation; in combination with the result discount change I get
these overall nofib numbers:
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
boyer -0.2% +5.4% -3.2% -3.4% 0.0%
cichelli -0.1% +5.9% -11.2% -11.7% 0.0%
compress2 -0.2% +9.6% -6.0% -6.8% 0.0%
cryptarithm2 -0.1% -3.9% -6.0% -5.7% 0.0%
gamteb -0.2% +2.6% -13.8% -14.4% 0.0%
genfft -0.1% -1.6% -29.5% -29.9% 0.0%
gg -0.0% -2.2% -17.2% -17.8% -20.0%
life -0.1% -2.2% -62.3% -63.4% 0.0%
mate +0.0% +1.4% -5.1% -5.1% -14.3%
parser -0.2% -2.1% +7.4% +6.7% 0.0%
primetest -0.2% -12.8% -14.3% -14.2% 0.0%
puzzle -0.2% +2.1% -10.0% -10.4% 0.0%
rsa -0.2% -11.7% -3.7% -3.8% 0.0%
simple -0.2% +2.8% -36.7% -38.3% -2.2%
wheel-sieve2 -0.1% -19.2% -48.8% -49.2% -42.9%
--------------------------------------------------------------------------------
Min -0.4% -19.2% -62.3% -63.4% -42.9%
Max +0.3% +9.6% +7.4% +11.0% +16.7%
Geometric Mean -0.1% -0.3% -17.6% -18.0% -0.7%
I'm ok with these numbers, remembering that this change removes
an *exponential* increase in code size in some in-the-wild cases.
I investigated compress2. The difference is entirely caused by this
function no longer inlining
WriteRoutines.$woutputCodes
= \ (w :: [CodeEvent]) ->
let result_s1Sr
= case WriteRoutines.outputCodes_$s$woutput w 0# 0# 8# 9# of
(# ww1, ww2 #) -> (ww1, ww2)
in (# case result_s1Sr of (x, _) ->
map @Int @Char WriteRoutines.outputCodes1 x
, case result_s1Sr of { (_, y) -> y } #)
It was right on the cusp before, driven by the excessive result
discount. Too bad!
Happily, the compiler/perf tests show a number of improvements:
T12227 compiler bytes-alloc -6.6%
T12545 compiler bytes-alloc -4.7%
T13056 compiler bytes-alloc -3.3%
T15263 runtime bytes-alloc -13.1%
T17499 runtime bytes-alloc -14.3%
T3294 compiler bytes-alloc -1.1%
T5030 compiler bytes-alloc -11.7%
T9872a compiler bytes-alloc -2.0%
T9872b compiler bytes-alloc -1.2%
T9872c compiler bytes-alloc -1.5%
Metric Decrease:
T12227
T12545
T13056
T15263
T17499
T3294
T5030
T9872a
T9872b
T9872c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f0b671ee8a65913891c07f157b21d77d6c63036">7f0b671e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-13T14:52:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Widen acceptance threshold on T5837
This test is positively tiny and consequently the bytes allocated
measurement will be relatively noisy. Consequently I have seen this
fail spuriously quite often.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/118e1c3da622f17c67b4e0fbc12ed7c7084055dc">118e1c3d</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-07-14T21:30:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: re-engineer the treatment of rebindable if
Executing on the plan described in #17582, this patch changes the way if expressions
are handled in the compiler in the presence of rebindable syntax. We get rid of the
SyntaxExpr field of HsIf and instead, when rebindable syntax is on, we rewrite the HsIf
node to the appropriate sequence of applications of the local `ifThenElse` function.
In order to be able to report good error messages, with expressions as they were
written by the user (and not as desugared by the renamer), we make use of TTG
extensions to extend GhcRn expression ASTs with an `HsExpansion` construct, which
keeps track of a source (GhcPs) expression and the desugared (GhcRn) expression that
it gives rise to. This way, we can typecheck the latter while reporting the former in
error messages.
In order to discard the error context lines that arise from typechecking the desugared
expressions (because they talk about expressions that the user has not written), we
carefully give a special treatment to the nodes fabricated by this new renaming-time
transformation when typechecking them. See Note [Rebindable syntax and HsExpansion]
for more details. The note also includes a recipe to apply the same treatment to
other rebindable constructs.
Tests 'rebindable11' and 'rebindable12' have been added to make sure we report
identical error messages as before this patch under various circumstances.
We also now disable rebindable syntax when processing untyped TH quotes, as per
the discussion in #18102 and document the interaction of rebindable syntax and
Template Haskell, both in Note [Template Haskell quotes and Rebindable Syntax]
and in the user guide, adding a test to make sure that we do not regress in
that regard.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64c774b043a2d9be3b98e445990c795f070dab3f">64c774b0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-14T21:31:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Explain why keeping DynFlags in AnalEnv saves allocation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/254245d01e3c1d4f9072abc4372fd3fb0a6ece9f">254245d0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-14T21:32:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs/users-guide: Update default -funfolding-use-threshold value
This was changed in 3d2991f8 but I neglected to update the
documentation. Fixes #18419.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c259f86938f4016f4bd4fde7a300fa83591036f">4c259f86</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-14T21:32:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Escape backslashes in json profiling reports properly.
I also took the liberty to do away the fixed buffer size for escaping.
Using a fixed size here can only lead to issues down the line.
Fixes #18438.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2379722438cb551210c4899119ade05989c17166">23797224</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-07-14T21:33:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">.gitlab: re-enable integer-simple substitute (BIGNUM_BACKEND)
Recently build system migrated from INTEGER_LIBRARY to BIGNUM_BACKEND.
But gitlab CI was never updated. Let's enable BIGNUM_BACKEND=native.
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/e0db878a789e58c2a1aba2e73d42857008174124">e0db878a</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-07-14T21:33:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-bignum: bring in sync .hs-boot files with module declarations
Before this change `BIGNUM_BACKEND=native` build was failing as:
```
libraries/ghc-bignum/src/GHC/Num/BigNat/Native.hs:708:16: error:
* Variable not in scope: naturalFromBigNat# :: WordArray# -> t
* Perhaps you meant one of these:
`naturalFromBigNat' (imported from GHC.Num.Natural),
`naturalToBigNat' (imported from GHC.Num.Natural)
|
708 | m' = naturalFromBigNat# m
|
```
This happens because `.hs-boot` files are slightly out of date.
This change brings in data and function types in sync.
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/c9f65c369a60467dcaf2b37d5f41f00565b4fe25">c9f65c36</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-14T21:33:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Disassembler.c: Use FMT_HexWord for printing values in hex format
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58ae62ebb5750e4dfbdb171efde8e3064b7afea8">58ae62eb</a></strong>
<div>
<span>by Matthias Andreas Benkard</span>
<i>at 2020-07-14T21:34:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">macOS: Load frameworks without stating them first.
macOS Big Sur makes the following change to how frameworks are shipped
with the OS:
> New in macOS Big Sur 11 beta, the system ships with a built-in
> dynamic linker cache of all system-provided libraries. As part of
> this change, copies of dynamic libraries are no longer present on
> the filesystem. Code that attempts to check for dynamic library
> presence by looking for a file at a path or enumerating a directory
> will fail. Instead, check for library presence by attempting to
> dlopen() the path, which will correctly check for the library in the
> cache. (62986286)
https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11-beta-release-notes/
Therefore, the previous method of checking whether a library exists
before attempting to load it makes GHC.Runtime.Linker.loadFramework
fail to find frameworks installed at /System/Library/Frameworks.
GHC.Runtime.Linker.loadFramework now opportunistically loads the
framework libraries without checking for their existence first,
failing only if all attempts to load a given framework from any of the
various possible locations fail.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdc4a6b0f71bbd16a11f23e455b28c0c15720b38">cdc4a6b0</a></strong>
<div>
<span>by Matthias Andreas Benkard</span>
<i>at 2020-07-14T21:34:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">loadFramework: Output the errors collected in all loading attempts.
With the recent change away from first finding and then loading a
framework, loadFramework had no way of communicating the real reason
why loadDLL failed if it was any reason other than the framework
missing from the file system. It now collects all loading attempt
errors into a list and concatenates them into a string to return to
the caller.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/51dbfa52df483822b99bb191d2ffc0943954e1d3">51dbfa52</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T04:05:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">StgToCmm: Use CmmRegOff smart constructor
Previously we would generate expressions of the form
`CmmRegOff BaseReg 0`. This should do no harm (and really should be
handled by the NCG anyways) but it's better to just generate a plain
`CmmReg`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae11bdfd98a10266bfc7de9e16b500be220307ac">ae11bdfd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T04:06:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add regression test for #17744
Test due to @monoidal.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e3c277a6c82c5ab529771c1c493d86e7eda0a98">0e3c277a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal submodule
Updates a variety of tests as Cabal is now more strict about Cabal file
form.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ceed994acd07259ef3a780ab440185dbb26fff09">ceed994a</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Drop Windows Vista support, require Windows 7
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/00a23bfda4840546075ec2b2e18f61380b360dfc">00a23bfd</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update Windows FileSystem wrapper utilities.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/459e1c5f7c71e37ed8bb239c57bdec441d278fff">459e1c5f</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Use SlimReaderLocks and ConditonalVariables provided by the OS instead of emulated ones
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/763088fc3c14c8687685fe811eac13d216971840">763088fc</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Small linker comment and ifdef cleanups
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a228ff9e04c91bc9b6f62942dc18bf1985a58a4">1a228ff9</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Flush event logs eagerly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9e04ddae1bf89902803d86282f41a586620c58f">e9e04dda</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Refactor Buffer structures to be able to track async operations
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/356dc3feae967b1c361130f1f356ef9ad6a693e4">356dc3fe</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Implement new Console API
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90e69f779b6da755fac472337535a1321cbb7917">90e69f77</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add IOPort synchronization primitive
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71245fcce24723910f12f934fbc4c700658b727a">71245fcc</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add new io-manager cmdline options
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d548a3b3058232cbfd588f6a2c2b9108bbe8d190">d548a3b3</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Init Windows console Codepage to UTF-8.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58ef63668ec395aa7a2b250d9930641305d646e2">58ef6366</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add unsafeSplat to GHC.Event.Array
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d660725edbdaeef9be5da4c032e687276dd09b13">d660725e</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add size and iterate to GHC.Event.IntTable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/050da6dd42d0cb293c7fce4a5ccdeb5abe1aadb4">050da6dd</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Switch Testsuite to test winio by default
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf542bf1cdf2fa468457fc0af21333478293476">4bf542bf</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Multiple refactorings and support changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4489af6bad11a198e9e6c192f41e17020f28d0c1">4489af6b</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: core threaded I/O manager
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64d8f2fe2d27743e2986d2176b1aa934e5484d7a">64d8f2fe</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: core non-threaded I/O manager
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8da15a09955926c4617d3468b84b3f3ca414d48a">8da15a09</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix a scheduler bug with the threaded-runtime.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84ea3d1492127442e2d416f1f576a5921186ada4">84ea3d14</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Relaxing some constraints in io-manager.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ccf0d1073969e3b73fed82cd421d74800f552953">ccf0d107</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix issues with non-threaded I/O manager after split.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b492fe6e4bde56341abbdb55d19fdf6e02ff70e9">b492fe6e</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove some barf statements that are a bit strict.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01423fd205809e884fd9b7b69286108ca06a0d98">01423fd2</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Expand comments describing non-threaded loop
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b69004f3c9518f59a8f0b6f7f77aa92bea85adf">4b69004f</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix FileSize unstat-able handles
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b38427045b8f1621f607fa7ab9c6353aa479ac5">9b384270</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Implement new tempfile routines for winio
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1e0be824523c6687e3d8588c46a57b2cd22ecc1">f1e0be82</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix input truncation when reading from handle.
This was caused by not upholding the read buffer invariant
that bufR == bufL == 0 for empty read buffers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e176b625689563d2ccfbfec46e664d17824f1968">e176b625</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix output truncation for writes larger than buffer size
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a831ce0e7f0bbd8d81e96074e981fe1972fde6dd">a831ce0e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Rewrite bufWrite.
I think it's far easier to follow the code now.
It's also correct now as I had still missed a spot
where we didn't update the offset.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6aefdf62b767b7828698c3ec5bf6a15e6e20eddb">6aefdf62</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix offset set by bufReadEmpty.
bufReadEmpty returns the bytes read *including* content that
was already buffered,
But for calculating the offset we only care about the number
of bytes read into the new buffer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/750ebaeec06d7ee118abfbb29142c12fb31730cc">750ebaee</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Clean up code surrounding IOPort primitives.
According to phyx these should only be read and written once per
object. Not neccesarily in that order.
To strengthen that guarantee the primitives will now throw an
exception if we violate this invariant.
As a consequence we can eliminate some code from their primops.
In particular code dealing with multiple queued readers/writers
now simply checks the invariant and throws an exception if it
was violated. That is in contrast to mvars which will do things
like wake up all readers, queue multi writers etc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffd31db99f6fb8958900147035ddac9a47b7a764">ffd31db9</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix multi threaded threadDelay and a few other small changes.
Multithreaded threadDelay suffered from a race condition
based on the ioManagerStatus. Since the status isn't needed
for WIO I removed it completely.
This resulted in a light refactoring, as consequence we will always
wake up the IO manager using interruptSystemManager, which uses
`postQueuedCompletionStatus` internally.
I also added a few comments which hopefully makes the code easier to
dive into for the next person diving in.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ec26df241d80e8e5cf39a02757c274067c8078d">6ec26df2</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">wionio: Make IO subsystem check a no-op on non-windows platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29bcd9363f2712524f7720377f19cb885adf2825">29bcd936</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Set handle offset when opening files in Append mode.
Otherwise we would truncate the file.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55c29700fba3f35a80acd366b2f05b66464d8258">55c29700</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove debug event log trace
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9acb9f40d90b79da9e587022d73f8afb26a46463">9acb9f40</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix sqrt and openFile009 test cases
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57017cb7454cbfaa1b011693e7fb141fbf519ccf">57017cb7</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Allow hp2ps to build with -DDEBUG
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8cd99951c8e21f82c3a95940de10128b78ab4ab">b8cd9995</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update output of T9681 since we now actually run it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10af5b1418554860e377b0df79026c2ea3669ab4">10af5b14</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: A few more improvements to the IOPort primitives.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39afc4a785a37f238a9004b2f6882d1951953c07">39afc4a7</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix expected tempfiles output.
Tempfiles now works properly on windows, as such we can
delete the win32 specific output.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99db46e09c50681e35de75d8bfec6cfb9ac3f9fc">99db46e0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Assign thread labels to IOManager threads.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be6af7324bcd918c61172f6814b8a70a6cfdd58e">be6af732</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Properly check for the tso of an incall to be zero.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2c6dac783d6cb15217a3be196abeba6c6105588">e2c6dac7</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Mark FD instances as unsupported under WINIO.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd02ceed5661e1c2fa85ec5c663697a3b0cf3e04">fd02ceed</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix threadDelay maxBound invocations.
Instead of letting the ns timer overflow now clamp it at
(maxBound :: Word64) ns. That still gives a few hundred
years.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc79f9f180b3fc73fe25439faf9cc5f19622acb3">bc79f9f1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add comments/cleanup an import in base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d197f4bbe5bf6d7189c329a742917db3f67ad34">1d197f4b</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Mark outstanding_service_requests volatile.
As far as I know C(99) gives no guarantees for code like
bool condition;
...
while(condition)
sleep();
that condition will be updated if it's changed by another thread.
So we are explicit here and mark it as volatile, this will force
a reload from memory on each iteration.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc4381869748ec25ac9560bf7e89641b560b6862">dc438186</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Make last_event a local variable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2fc957c52270d93073b7ed9fe42ac51fcd749a45">2fc957c5</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add comment about thread safety of processCompletion.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c026b6cf5eb25651f656833e4d312621866330d">4c026b6c</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: nonthreaded: Create io processing threads in main thread.
We now set a flag in the IO thread. The scheduler when looking for work
will check the flag and create/queue threads accordingly.
We used to create these in the IO thread. This improved performance
but caused frequent segfaults. Thread creation/allocation is only safe to
do if nothing currently accesses the storeagemanager. However without
locks in the non-threaded runtime this can't be guaranteed.
This shouldn't change performance all too much.
In the past we had:
* IO: Create/Queue thread.
* Scheduler: Runs a few times. Eventually picks up IO processing thread.
Now it's:
* IO: Set flag to queue thread.
* Scheduler: Pick up flag, if set create/queue thread. Eventually picks up IO processing thread.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f47c7208c31bdd695ba46e6bdf4a349ae46c79bc">f47c7208</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add an exported isHeapAlloced function to the RTS
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc5d7bb1dcf5603ac47320e83e4fc9ef53e409e9">cc5d7bb1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Queue IO processing threads at the front of the queue.
This will unblock the IO thread sooner hopefully leading to higher
throughput in some situations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e763011596ccafccdd476e1cac0ee6088d439e3b">e7630115</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: ThreadDelay001: Use higher resolution timer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/451b5f96c8a3366584a62034747c8b78fc3b0486">451b5f96</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update T9681 output, disable T4808 on windows.
T4808 tests functionality of the FD interface which won't be supported
under WINIO.
T9681 just has it's expected output tweaked.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd06f930a3228ef7ae8ea5c7225552d6df21f662">dd06f930</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Wake io manager once per registerTimeout.
Which is implicitly done in editTimeouts, so need to wake it
up twice.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e87d0bf9a430bf52a0068b9b53dcc4592c8da930">e87d0bf9</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update placeholder comment with actual function name.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc9025db55345d6b427489b942878d781f70a039">fc9025db</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Always lock win32 event queue
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c24c9a1f2a10e044a31b7d89586f4a19ff61e137">c24c9a1f</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Display thread labels when tracing scheduler events.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06542b033116bfc4b47c80bdeab44ed1d99005bb">06542b03</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Refactor non-threaded runner thread and scheduler interface.
Only use a single communication point (registerAlertableWait) to inform
the C side aobut both timeouts to use as well as outstanding requests.
Also queue a haskell processing thread after each return from alertable
waits. This way there is no risk of us missing a timer event.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/256299b13e17044d6904a85043130d13bc592a62">256299b1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove outstanding_requests from runner.
We used a variable to keep track of situations where we got
entries from the IO port, but all of them had already been
canceled. While we can avoid some work that way this case
seems quite rare.
So we give up on tracking this and instead always assume at
least one of the returned entries is valid.
If that's not the case no harm is done, we just perform some
additional work. But it makes the runner easier to reason about.
In particular we don't need to care if another thread modifies
oustanding_requests after we return from waiting on the IO Port.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ebd8ad9b1f7f77a928f2ff0d3e61ddfae068dd3">3ebd8ad9</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Various fixes related to rebase and testdriver
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6be6bcbac0e39537f3a40c615d1568a3d6391f9b">6be6bcba</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix rebase artifacts
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c649dc3ba7b08817352eb24d9888651290b6eb6">2c649dc3</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Rename unsafeSplat to unsafeCopyFromBuffer
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a18b73f34dc3d177e76259bd65326a94824d97e0">a18b73f3</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove unused size/iterate operations from IntTable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/16bab48ef69866725d2ab20ca7bd1da5f5a70000">16bab48e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Detect running IO Backend via peeking at RtsConfig
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b8405a0dd45c16ec305884cadda992327733621">8b8405a0</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: update temp path so GCC etc can handle it.
Also fix PIPE support, clean up error casting, fix memory leaks
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2092bc542516461eeb06d855dfbe9b04438767bc">2092bc54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Minor comments/renamings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5b5b6c0de4e9ea2923beeff488e852aa247000a">a5b5b6c0</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Checking if an error code indicates completion is now a function.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/362176fd9189e73083fd2a2012c9b5be1e3fd05b">362176fd</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Small refactor in withOverlappedEx
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32e20597b2fe5864b578c732501fe20d899e8f9c">32e20597</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: A few comments and commented out dbxIO
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4bfc1d9ae59adc58a0df3b25f85873533481e94">a4bfc1d9</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Don't drop buffer offset in byteView/cwcharView
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3ad2a54bf775e1ca110b501894891d4ccff3d8f">b3ad2a54</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: revert BHandle changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3dcd87e2fd6d03028d18bf1a61e526142ee9b8a1">3dcd87e2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix imports
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a3718909e8eb214d4a70082b7fee8d6f3efc975">5a371890</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: update ghc-cabal to handle new Cabal submodule bump
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d07ebe0df6df32bbffbf77ea09e39b6da2e8cbb3">d07ebe0d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Only compile sources on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcb423937a052496af73e34a315e3d15882b9f19">dcb42393</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Actually return Nothing on EOF for non-blocking read
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/895a3beb26de69f5611ea496dddb2b121c1dd5c1">895a3beb</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Deduplicate logic in encodeMultiByte[Raw]IO.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e06e6734a4d5c49c625605a2675c47fd93f834b2">e06e6734</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Deduplicate openFile logic
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b59430c00f41e18386bc44540180451169f6b9d7">b59430c0</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix -werror issue in encoding file
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8d39a510c563271e26ec7175b8e538d0b6809da">f8d39a51</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Don't mention windows specific functions when building on Linux.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a533d2afaab8b8ca0026c9af1a8ed9ff09c4462">6a533d2a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: add a note about file locking in the RTS.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf37ce3499a0367faf7fcaf014d8350e5864fe7a">cf37ce34</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add version to @since annotation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fafa2eb45d9283526c79f810476a369af21bf3b">0fafa2eb</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Rename GHC.Conc.IOCP -> GHC.Conc.WinIO
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1854fc23489baa39cb37f8d49ff74b7ee78d7de1">1854fc23</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Expand GHC.Conc.POSIX description
It now explains users may not use these functions when
using the old IO manager.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fcc7ba414e1dfab70136a824775421b26ce1b81a">fcc7ba41</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix potential spaceleak in __createUUIDTempFileErrNo
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6b3fd9fa15e75f646ac6eaa384f54afe853029f4">6b3fd9fa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove redundant -Wno-missing-signatures pragmas
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/916fc861520615149c66c1069f6cb661bc8b8483">916fc861</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Make it explicit that we only create one IO manager
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f260a7218f71398ad2dbca0f47feaf31c21081b3">f260a721</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Note why we don't use blocking waits.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa0a4bbfbae0244313fa99862b97f71c15f9bd81">aa0a4bbf</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove commented out pragma
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d679b544e14ad912fddc97b1b735d3c2838a2c4b">d679b544</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove redundant buffer write in Handle/Text.hs:bufReadEmpty
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3f94368cc27e124c07f9c3f90e3f9563a7fc55d">d3f94368</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Rename SmartHandles to StdHandles
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd6b8ec1e775441fc943702e93d48ce75f155e9e">bd6b8ec1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: add comment stating failure behaviour for getUniqueFileInfo.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/12846b85a94b2b73f456e4c441c7890d685deb67">12846b85</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update IOPort haddocks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f39fb14997f1aa3768c89bb8e83c6addc705d92">9f39fb14</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Add a note cross reference
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62dd5a7309f273b5bb7d6ab44a1d2745010c13a0">62dd5a73</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Name Haskell/OS I/O Manager explicitly in Note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa80782864895fe614e1b83416736014e68c8b35">fa807828</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Expand BlockedOnIOCompletion description.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0880a1daea4f3c9fa6fa4624914081f29736ea2">f0880a1d</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove historical todos
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e58e714e9a4b5fe77c4e71802cc4b9ad1998af3">8e58e714</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Update note, remove debugging pragma.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa4d84d556b39715ebc1a7860a620ec5a7d9beeb">aa4d84d5</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: flushCharReadBuffer shouldn't need to adjust offsets.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e580893ab8b76ff4b6582b1fb2ed55cc9742d5a2">e580893a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Remove obsolete comment about cond. variables
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d54e9d7911901ee5bfcba43b2e4e1a4df11c670e">d54e9d79</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix initial linux validate build
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cd4de46c1f31e2f044c671a4474126fc0d5a8da">3cd4de46</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix ThreadDelay001 CPP
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c88b1b9fde4eedcd1b62c51b1a53201ec3cf29c8">c88b1b9f</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix openFile009 merge conflict leftover
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/849e8889fe9586bf9e1bf37885537f25743383f2">849e8889</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Accept T9681 output.
GHC now reports String instead of [Char].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e7701818e75b66957724f48c4aafac146699b667">e7701818</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix cabal006 after upgrading cabal submodule
Demand cabal 2.0 syntax instead of >= 1.20 as required by newer cabal versions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a44f037372feac67793deb919d988468809ce470">a44f0373</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Fix stderr output for ghci/linking/dyn tests.
We used to filter rtsopts, i opted to instead just accept the warning of it having no effect.
This works both for -rtsopts, as well as -with-rtsopts which winio adds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/515d98960d3cdcdd7d78a9f28d1b0ad39865c67f">515d9896</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Adjust T15261b stdout for --io-manager flag.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/949aaaccf34ef7e28a745081775b01627590fc46">949aaacc</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Adjust T5435_dyn_asm stderr
The warning about rtsopts having no consequences is expected.
So accept new stderr.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d424e1e31a8f16e614947460e0e4e4b52f8b5cf">7d424e1e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Also accept T7037 stderr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f0097683f65ee3cd917af843621ed73b5348e68">1f009768</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix cabal04 by filtering rts args
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/981a9f2e57728cdf39de9fc173b11be4084997d3">981a9f2e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix cabal01 by accepting expected stderr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7b0464eb7a5510fde4a804402491ecad2f1092b">b7b0464e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix safePkg01 by accepting expected stderr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32734b29cbe0450d27fa6b4ea67b05aff2c4919d">32734b29</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix T5435_dyn_gcc by accepting expected stderr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acc5cebf42e38c2b0869117329811c03c4e3f545">acc5cebf</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix tempfiles test on linux
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c577b789e8f76f81a99f1731700c27796effb598">c577b789</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Accept accepted stderr for T3807
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c108c52779a6423871ea372be82b94f5274e57da">c108c527</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Accept accepted stderr for linker_unload
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b0b9a08a3412114f568fb26e3d684ccb7092f88">2b0b9a08</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: Accept accepted stderr for linker_unload_multiple_objs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67afb03c45cf8a8dc9e51413cf187f36768a5a0b">67afb03c</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: clarify wording on conditional variables.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bd415721672da9aa88c4528df8ba15bc616f3be">3bd41572</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: clarify comment on cooked mode.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ded58a037774147073366ff2dfdc8965e02a96e5">ded58a03</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: update lockfile signature and remove mistaken symbol in rts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2143c49273d7d87ee2f3ef1211856d60b1427af1">2143c492</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-15T16:41:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add winio and winio_threaded ways
Reverts many of the testsuite changes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c0979cc53442b3a6202acab9cf164f0a4beea0b7">c0979cc5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-16T10:56:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge remote-tracking branch 'origin/wip/winio'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/750a1595ef31cdc335f3bab045b2f19a9c43ff93">750a1595</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-18T07:26:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add --copying-gc flag to reverse effect of --nonmoving-gc
Fixes #18281.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ba6a881c58459008f02fb4816f8dec2800c2b73">6ba6a881</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-18T07:26:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement `fullCompilerVersion`
Follow-up of https://gitlab.haskell.org/ghc/ghc/-/issues/18403
This MR adds `fullCompilerVersion`, a function that shares the same
backend as the `--numeric-version` GHC flag, exposing a full,
three-digit version datatype.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6cf27dfded59fe42bd6be323573c0d576e6204a">e6cf27df</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a Lint hadrian rule and an .hlint.yaml file in base/
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcb177dd00c91d825e00ed228bce6cfeb7684bf7">bcb177dd</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow multiple case branches to have a higher rank type
As #18412 points out, it should be OK for multiple case alternatives
to have a higher rank type, provided they are all the same.
This patch implements that change. It sweeps away
GHC.Tc.Gen.Match.tauifyMultipleBranches, and friends, replacing it
with an enhanced version of fillInferResult.
The basic change to fillInferResult is to permit the case in which
another case alternative has already filled in the result; and in
that case simply unify. It's very simple actually.
See the new Note [fillInferResult] in TcMType
Other refactoring:
- Move all the InferResult code to one place, in GHC.Tc.Utils.TcMType
(previously some of it was in Unify)
- Move tcInstType and friends from TcMType to Instantiate, where it
more properly belongs. (TCMType was getting very long.)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5525a51900623e04ec914e9dcc7f4ad1fd3b528">e5525a51</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve typechecking of NPlusK patterns
This patch (due to Richard Eisenberg) improves
documentation of the wrapper returned by tcSubMult
(see Note [Wrapper returned from tcSubMult] in
GHC.Tc.Utils.Unify).
And, more substantially, it cleans up the multiplicity
handling in the typechecking of NPlusKPat
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/12f9035200424ec8104484f154a040d612fee99d">12f90352</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-18T07:26:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove {-# CORE #-} pragma (part of #18048)
This pragma has no effect since 2011.
It was introduced for External Core, which no longer exists.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e504c9137dff2b8f51e8ed96b5cbb5a0d19f8e3a">e504c913</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the simplification of join binders
This MR (for #18449) refactors the Simplifier's treatment
of join-point binders.
Specifically, it puts together, into
GHC.Core.Opt.Simplify.Env.adjustJoinPointType
two currently-separate ways in which we adjust the type of
a join point. As the comment says:
-- (adjustJoinPointType mult new_res_ty join_id) does two things:
--
-- 1. Set the return type of the join_id to new_res_ty
-- See Note [Return type for join points]
--
-- 2. Adjust the multiplicity of arrows in join_id's type, as
-- directed by 'mult'. See Note [Scaling join point arguments]
I think this actually fixes a latent bug, by ensuring that the
seIdSubst and seInScope have the right multiplicity on the type
of join points.
I did some tidying up while I was at it. No more
setJoinResTy, or modifyJoinResTy: instead it's done locally in
Simplify.Env.adjustJoinPointType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49b265f08c7ac9c9dea6cfff0d67447728b7b416">49b265f0</a></strong>
<div>
<span>by Chaitanya Koparkar</span>
<i>at 2020-07-18T07:26:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix minor typos in a Core.hs note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d59aed6e9f494d6eae41c5ba32cde23cecaeb14">8d59aed6</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-18T07:26:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHCi: Fix isLittleEndian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c26e81d116a653b5259aeb290fb1e697efe3382a">c26e81d1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-18T07:26:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark ghci tests as fragile under unreg compiler
In particular I have seen T16012 fail repeatedly under the
unregisterised compiler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/868e452340ade3155dd7e552c16bbb3c21c42b8a">868e4523</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "AArch32 symbols only on aarch32."
This reverts commit cdfeb3f24f76e8fd30452016676e56fbc827789a.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c915ba84f4ec8c4f0f006bd6aa938d17936dcd93">c915ba84</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Fix (1)"
This reverts commit 7abffced01f5680efafe44f6be2733eab321b039.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/777c452a83ebdb2b50f3f328255a6f36ae49f398">777c452a</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "better if guards."
This reverts commit 3f60b94de1f460ca3f689152860b108a19ce193e.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dd405529f0f17cd9a5b299e7ae5539a885b4b5a">0dd40552</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "[linker/rtsSymbols] More linker symbols"
This reverts commit 686e72253aed3880268dd6858eadd8c320f09e97.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30caeee75193ea961c55ee847a3156e23116e84e">30caeee7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-21T06:39:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: remove use of sdocWithDynFlags from GHC.Stg.* (#17957)
* add StgPprOpts datatype
* remove Outputable instances for types that need `StgPprOpts` to be
pretty-printed and explicitly call type specific ppr functions
* add default `panicStgPprOpts` for panic messages (when it's not
convenient to thread StgPprOpts or DynFlags down to the ppr function
call)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/863c544c9849e49872acac64b8faea56a3311564">863c544c</a></strong>
<div>
<span>by Mark</span>
<i>at 2020-07-21T06:39:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a typo in existential_quantification.rst</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05910be1ac5c1f485132d2c8bd1ceb4f86e06db5">05910be1</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-21T14:47:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add release notes entry for #17816
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a625719284db7c69fa3d122e829291a16960e85f">a6257192</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-07-21T14:47:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a newtype `Code` for the return type of typed quotations (Proposal #195)
There are three problems with the current API:
1. It is hard to properly write instances for ``Quote m => m (TExp a)`` as the type is the composition
of two type constructors. Doing so in your program involves making your own newtype and
doing a lot of wrapping/unwrapping.
For example, if I want to create a language which I can either run immediately or
generate code from I could write the following with the new API. ::
class Lang r where
_int :: Int -> r Int
_if :: r Bool -> r a -> r a -> r a
instance Lang Identity where
_int = Identity
_if (Identity b) (Identity t) (Identity f) = Identity (if b then t else f)
instance Quote m => Lang (Code m) where
_int = liftTyped
_if cb ct cf = [|| if $$cb then $$ct else $$cf ||]
2. When doing code generation it is common to want to store code fragments in
a map. When doing typed code generation, these code fragments contain a
type index so it is desirable to store them in one of the parameterised
map data types such as ``DMap`` from ``dependent-map`` or ``MapF`` from
``parameterized-utils``.
::
compiler :: Env -> AST a -> Code Q a
data AST a where ...
data Ident a = ...
type Env = MapF Ident (Code Q)
newtype Code m a = Code (m (TExp a))
In this example, the ``MapF`` maps an ``Ident String`` directly to a ``Code Q String``.
Using one of these map types currently requires creating your own newtype and constantly
wrapping every quotation and unwrapping it when using a splice. Achievable, but
it creates even more syntactic noise than normal metaprogramming.
3. ``m (TExp a)`` is ugly to read and write, understanding ``Code m a`` is
easier. This is a weak reason but one everyone
can surely agree with.
Updates text submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58235d46bd4e9fbf69bd82969b29cd9c6ab051e1">58235d46</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-21T14:47:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix :rts-flag:`--copying-gc` documentation
It was missing a newline.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19e80b9af252eee760dc047765a9930ef00067ec">19e80b9a</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-21T14:50:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accumulate Haddock comments in P (#17544, #17561, #8944)
Haddock comments are, first and foremost, comments. It's very annoying
to incorporate them into the grammar. We can take advantage of an
important property: adding a Haddock comment does not change the parse
tree in any way other than wrapping some nodes in HsDocTy and the like
(and if it does, that's a bug).
This patch implements the following:
* Accumulate Haddock comments with their locations in the P monad.
This is handled in the lexer.
* After parsing, do a pass over the AST to associate Haddock comments
with AST nodes using location info.
* Report the leftover comments to the user as a warning (-Winvalid-haddock).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c888db3275310c2cf875fb82e354ab567d2f84c">6c888db3</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-23T12:57:10+01:00</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>
</ul>
<h4>16 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#70f0e3f682e0543f692942cb7bafd17134d6b88b">
<span class="new-file">
+
.git-ignore-revs
</span>
</a>
</li>
<li class="file-stats">
<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
</a>
</li>
<li class="file-stats">
<a href="#157f7634c25bc6366cb7c9c9edb48e819dce38db">
.gitlab/ci.sh
</a>
</li>
<li class="file-stats">
<a href="#412267f7d5ed866deae5ac2ca598ff8092b826b6">
.gitlab/linters/check-cpp.py
</a>
</li>
<li class="file-stats">
<a href="#b25b374c2459de3e2aaed42163f492c8b8614385">
.gitlab/merge_request_templates/merge-request.md
</a>
</li>
<li class="file-stats">
<a href="#f656107cc03a27946448887125380c358788500e">
.gitlab/test-metrics.sh
</a>
</li>
<li class="file-stats">
<a href="#7445606fbf8f3683cd42bdc54b05d7a0bc2dfc44">
.gitmodules
</a>
</li>
<li class="file-stats">
<a href="#abe895765c4ce08c5dfbc95e5e3c5db67ff92ded">
CODEOWNERS
</a>
</li>
<li class="file-stats">
<a href="#836efb6e25a091dcb4ff8e1dbb2f0be6a5cbf14c">
Makefile
</a>
</li>
<li class="file-stats">
<a href="#9ab3868b23ed5d5a6e12ef902049902556fa4009">
aclocal.m4
</a>
</li>
<li class="file-stats">
<a href="#d0d96a6d03668aeab20ebe05e2c4ccb798c7e64c">
compiler/GHC.hs
</a>
</li>
<li class="file-stats">
<a href="#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77">
<span class="new-file">
+
compiler/GHC/Builtin/Names.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#06764eb0158306b83ab1998d18316392a51838c2">
<span class="new-file">
+
compiler/GHC/Builtin/Names/TH.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#a1519b7fe8a0d4b42e4aaa927fb6ab5b5da0fcdd">
<span class="new-file">
+
compiler/GHC/Builtin/PrimOps.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#dc9d549002b8cd260ee6d1d2fb35877c74412f91">
<span class="new-file">
+
compiler/GHC/Builtin/PrimOps.hs-boot
</span>
</a>
</li>
<li class="file-stats">
<a href="#5f4b3cf094f6e2fc46805a6c447613ae13a08942">
<span class="new-file">
+
compiler/GHC/Builtin/RebindableNames.hs
</span>
</a>
</li>
</ul>
<h5>The diff was not included because it is too large.</h5>
</div>
<div class="footer" style="margin-top: 10px;">
<p style="font-size: small; color: #777;">
—
<br>
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e245779ff0d183c6b1040ef25583f7083617f0a6...6c888db3275310c2cf875fb82e354ab567d2f84c">View it on GitLab</a>.
<br>
You're receiving this email because of your account on gitlab.haskell.org.
If you'd like to receive fewer emails, you can
adjust your notification settings.
</p>
</div>
</body>
</html>