Simon Peyton Jones pushed to branch wip/T24466 at Glasgow Haskell Compiler / GHC
Commits:
f4d80f08 by Simon Peyton Jones at 2026-08-10T08:30:15+01:00
Wibble comments
- - - - -
1 changed file:
- compiler/GHC/Core/Opt/FloatIn.hs
Changes:
=====================================
compiler/GHC/Core/Opt/FloatIn.hs
=====================================
@@ -860,6 +860,9 @@ sepBindsByDropPoint platform is_case floaters here_fvs fork_fvs
n_used_alts = count id used_in_flags -- returns number of Trues in list.
+ -- A demanded thunk like let x = factorial y in ... could be pushed, but
+ -- it'll turn into a case-expression so it doesn't allocate directly.
+ -- So I am experimenting with making it stay put.
strict_thunk = case bind of
FloatCase{} -> False
FloatLet (Rec {}) -> False
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f4d80f08e32be3727a67962a2c3853d…
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f4d80f08e32be3727a67962a2c3853d…
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[Git][ghc/ghc][wip/T19001] 171 commits: Demand: Clear distinction between Call SubDmd and eval Dmd (#21717)
by Simon Peyton Jones (＠simonpj) 10 Aug '26
by Simon Peyton Jones (＠simonpj) 10 Aug '26
10 Aug '26
Simon Peyton Jones pushed to branch wip/T19001 at Glasgow Haskell Compiler / GHC
Commits:
aeafdba5 by Sebastian Graf at 2022-09-27T15:14:54+02:00
Demand: Clear distinction between Call SubDmd and eval Dmd (#21717)
In #21717 we saw a reportedly unsound strictness signature due to an unsound
definition of plusSubDmd on Calls. This patch contains a description and the fix
to the unsoundness as outlined in `Note [Call SubDemand vs. evaluation Demand]`.
This fix means we also get rid of the special handling of `-fpedantic-bottoms`
in eta-reduction. Thanks to less strict and actually sound strictness results,
we will no longer eta-reduce the problematic cases in the first place, even
without `-fpedantic-bottoms`.
So fixing the unsoundness also makes our eta-reduction code simpler with less
hacks to explain. But there is another, more unfortunate side-effect:
We *unfix* #21085, but fortunately we have a new fix ready:
See `Note [mkCall and plusSubDmd]`.
There's another change:
I decided to make `Note [SubDemand denotes at least one evaluation]` a lot
simpler by using `plusSubDmd` (instead of `lubPlusSubDmd`) even if both argument
demands are lazy. That leads to less precise results, but in turn rids ourselves
from the need for 4 different `OpMode`s and the complication of
`Note [Manual specialisation of lub*Dmd/plus*Dmd]`. The result is simpler code
that is in line with the paper draft on Demand Analysis.
I left the abandoned idea in `Note [Unrealised opportunity in plusDmd]` for
posterity. The fallout in terms of regressions is negligible, as the testsuite
and NoFib shows.
```
Program Allocs Instrs
--------------------------------------------------------------------------------
hidden +0.2% -0.2%
linear -0.0% -0.7%
--------------------------------------------------------------------------------
Min -0.0% -0.7%
Max +0.2% +0.0%
Geometric Mean +0.0% -0.0%
```
Fixes #21717.
- - - - -
9b1595c8 by Ross Paterson at 2022-09-27T14:12:01-04:00
implement proposal 106 (Define Kinds Without Promotion) (fixes #6024)
includes corresponding changes to haddock submodule
- - - - -
c2d73cb4 by Andreas Klebinger at 2022-09-28T15:07:30-04:00
Apply some tricks to speed up core lint.
Below are the noteworthy changes and if given their impact on compiler
allocations for a type heavy module:
* Use the oneShot trick on LintM
* Use a unboxed tuple for the result of LintM: ~6% reduction
* Avoid a thunk for the result of typeKind in lintType: ~5% reduction
* lint_app: Don't allocate the error msg in the hot code path: ~4%
reduction
* lint_app: Eagerly force the in scope set: ~4%
* nonDetCmpType: Try to short cut using reallyUnsafePtrEquality#: ~2%
* lintM: Use a unboxed maybe for the `a` result: ~12%
* lint_app: make go_app tail recursive to avoid allocating the go function
as heap closure: ~7%
* expandSynTyCon_maybe: Use a specialized data type
For a less type heavy module like nofib/spectral/simple compiled with
-O -dcore-lint allocations went down by ~24% and compile time by ~9%.
-------------------------
Metric Decrease:
T1969
-------------------------
- - - - -
b74b6191 by sheaf at 2022-09-28T15:08:10-04:00
matchLocalInst: do domination analysis
When multiple Given quantified constraints match a Wanted, and there is
a quantified constraint that dominates all others, we now pick it
to solve the Wanted.
See Note [Use only the best matching quantified constraint].
For example:
[G] d1: forall a b. ( Eq a, Num b, C a b ) => D a b
[G] d2: forall a . C a Int => D a Int
[W] {w}: D a Int
When solving the Wanted, we find that both Givens match, but we pick
the second, because it has a weaker precondition, C a Int, compared
to (Eq a, Num Int, C a Int). We thus say that d2 dominates d1;
see Note [When does a quantified instance dominate another?].
This domination test is done purely in terms of superclass expansion,
in the function GHC.Tc.Solver.Interact.impliedBySCs. We don't attempt
to do a full round of constraint solving; this simple check suffices
for now.
Fixes #22216 and #22223
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2a53ac18 by Simon Peyton Jones at 2022-09-28T17:49:09-04:00
Improve aggressive specialisation
This patch fixes #21286, by not unboxing dictionaries in
worker/wrapper (ever). The main payload is tiny:
* In `GHC.Core.Opt.DmdAnal.finaliseArgBoxities`, do not unbox
dictionaries in `get_dmd`. See Note [Do not unbox class dictionaries]
in that module
* I also found that imported wrappers were being fruitlessly
specialised, so I fixed that too, in canSpecImport.
See Note [Specialising imported functions] point (2).
In doing due diligence in the testsuite I fixed a number of
other things:
* Improve Note [Specialising unfoldings] in GHC.Core.Unfold.Make,
and Note [Inline specialisations] in GHC.Core.Opt.Specialise,
and remove duplication between the two. The new Note describes
how we specialise functions with an INLINABLE pragma.
And simplify the defn of `spec_unf` in `GHC.Core.Opt.Specialise.specCalls`.
* Improve Note [Worker/wrapper for INLINABLE functions] in
GHC.Core.Opt.WorkWrap.
And (critially) make an actual change which is to propagate the
user-written pragma from the original function to the wrapper; see
`mkStrWrapperInlinePrag`.
* Write new Note [Specialising imported functions] in
GHC.Core.Opt.Specialise
All this has a big effect on some compile times. This is
compiler/perf, showing only changes over 1%:
Metrics: compile_time/bytes allocated
-------------------------------------
LargeRecord(normal) -50.2% GOOD
ManyConstructors(normal) +1.0%
MultiLayerModulesTH_OneShot(normal) +2.6%
PmSeriesG(normal) -1.1%
T10547(normal) -1.2%
T11195(normal) -1.2%
T11276(normal) -1.0%
T11303b(normal) -1.6%
T11545(normal) -1.4%
T11822(normal) -1.3%
T12150(optasm) -1.0%
T12234(optasm) -1.2%
T13056(optasm) -9.3% GOOD
T13253(normal) -3.8% GOOD
T15164(normal) -3.6% GOOD
T16190(normal) -2.1%
T16577(normal) -2.8% GOOD
T16875(normal) -1.6%
T17836(normal) +2.2%
T17977b(normal) -1.0%
T18223(normal) -33.3% GOOD
T18282(normal) -3.4% GOOD
T18304(normal) -1.4%
T18698a(normal) -1.4% GOOD
T18698b(normal) -1.3% GOOD
T19695(normal) -2.5% GOOD
T5837(normal) -2.3%
T9630(normal) -33.0% GOOD
WWRec(normal) -9.7% GOOD
hard_hole_fits(normal) -2.1% GOOD
hie002(normal) +1.6%
geo. mean -2.2%
minimum -50.2%
maximum +2.6%
I diligently investigated some of the big drops.
* Caused by not doing w/w for dictionaries:
T13056, T15164, WWRec, T18223
* Caused by not fruitlessly specialising wrappers
LargeRecord, T9630
For runtimes, here is perf/should+_run:
Metrics: runtime/bytes allocated
--------------------------------
T12990(normal) -3.8%
T5205(normal) -1.3%
T9203(normal) -10.7% GOOD
haddock.Cabal(normal) +0.1%
haddock.base(normal) -1.1%
haddock.compiler(normal) -0.3%
lazy-bs-alloc(normal) -0.2%
------------------------------------------
geo. mean -0.3%
minimum -10.7%
maximum +0.1%
I did not investigate exactly what happens in T9203.
Nofib is a wash:
+-------------------------------++--+-----------+-----------+
| || | tsv (rel) | std. err. |
+===============================++==+===========+===========+
| real/anna || | -0.13% | 0.0% |
| real/fem || | +0.13% | 0.0% |
| real/fulsom || | -0.16% | 0.0% |
| real/lift || | -1.55% | 0.0% |
| real/reptile || | -0.11% | 0.0% |
| real/smallpt || | +0.51% | 0.0% |
| spectral/constraints || | +0.20% | 0.0% |
| spectral/dom-lt || | +1.80% | 0.0% |
| spectral/expert || | +0.33% | 0.0% |
+===============================++==+===========+===========+
| geom mean || | | |
+-------------------------------++--+-----------+-----------+
I spent quite some time investigating dom-lt, but it's pretty
complicated. See my note on !7847. Conclusion: it's just a delicate
inlining interaction, and we have plenty of those.
Metric Decrease:
LargeRecord
T13056
T13253
T15164
T16577
T18223
T18282
T18698a
T18698b
T19695
T9630
WWRec
hard_hole_fits
T9203
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addeefc0 by Simon Peyton Jones at 2022-09-28T17:49:09-04:00
Refactor UnfoldingSource and IfaceUnfolding
I finally got tired of the way that IfaceUnfolding reflected
a previous structure of unfoldings, not the current one. This
MR refactors UnfoldingSource and IfaceUnfolding to be simpler
and more consistent.
It's largely just a refactor, but in UnfoldingSource (which moves
to GHC.Types.Basic, since it is now used in IfaceSyn too), I
distinguish between /user-specified/ and /system-generated/ stable
unfoldings.
data UnfoldingSource
= VanillaSrc
| StableUserSrc -- From a user-specified pragma
| StableSystemSrc -- From a system-generated unfolding
| CompulsorySrc
This has a minor effect in CSE (see the use of isisStableUserUnfolding
in GHC.Core.Opt.CSE), which I tripped over when working on
specialisation, but it seems like a Good Thing to know anyway.
- - - - -
7be6f9a4 by Simon Peyton Jones at 2022-09-28T17:49:09-04:00
INLINE/INLINEABLE pragmas in Foreign.Marshal.Array
Foreign.Marshal.Array contains many small functions, all of which are
overloaded, and which are critical for performance. Yet none of them
had pragmas, so it was a fluke whether or not they got inlined.
This patch makes them all either INLINE (small ones) or
INLINEABLE and hence specialisable (larger ones).
See Note [Specialising array operations] in that module.
- - - - -
b0c89dfa by Jade Lovelace at 2022-09-28T17:49:49-04:00
Export OnOff from GHC.Driver.Session
I was working on fixing an issue where HLS was trying to pass its
DynFlags to HLint, but didn't pass any of the disabled language
extensions, which HLint would then assume are on because of their
default values.
Currently it's not possible to get any of the "No" flags because the
`DynFlags.extensions` field can't really be used since it is [OnOff
Extension] and OnOff is not exported.
So let's export it.
- - - - -
2f050687 by Andrew Lelechenko at 2022-09-28T17:50:28-04:00
Avoid Data.List.group; prefer Data.List.NonEmpty.group
This allows to avoid further partiality, e. g., map head . group is
replaced by map NE.head . NE.group, and there are less panic calls.
- - - - -
bc0020fa by M Farkas-Dyck at 2022-09-28T22:51:59-04:00
Clean up `findWiredInUnit`. In particular, avoid `head`.
- - - - -
6a2eec98 by Andrew Lelechenko at 2022-09-28T22:52:38-04:00
Eliminate headFS, use unconsFS instead
A small step towards #22185 to avoid partial functions + safe implementation
of `startsWithUnderscore`.
- - - - -
5a535172 by Sebastian Graf at 2022-09-29T17:04:20+02:00
Demand: Format Call SubDemands `Cn(sd)` as `C(n,sd)` (#22231)
Justification in #22231. Short form: In a demand like `1C1(C1(L))`
it was too easy to confuse which `1` belongs to which `C`. Now
that should be more obvious.
Fixes #22231
- - - - -
ea0083bf by Bryan Richter at 2022-09-29T15:48:38-04:00
Revert "ci: enable parallel compression for xz"
Combined wxth XZ_OPT=9, this blew the memory capacity of CI runners.
This reverts commit a5f9c35f5831ef5108e87813a96eac62803852ab.
- - - - -
f5e8f493 by Sebastian Graf at 2022-09-30T18:42:13+02:00
Boxity: Don't update Boxity unless worker/wrapper follows (#21754)
A small refactoring in our Core Opt pipeline and some new functions for
transfering argument boxities from one signature to another to facilitate
`Note [Don't change boxity without worker/wrapper]`.
Fixes #21754.
- - - - -
4baf7b1c by M Farkas-Dyck at 2022-09-30T17:45:47-04:00
Scrub various partiality involving empty lists.
Avoids some uses of `head` and `tail`, and some panics when an argument is null.
- - - - -
95ead839 by Alexis King at 2022-10-01T00:37:43-04:00
Fix a bug in continuation capture across multiple stack chunks
- - - - -
22096652 by Andrew Lelechenko at 2022-10-01T00:38:22-04:00
Enforce internal invariant of OrdList and fix bugs in viewCons / viewSnoc
`viewCons` used to ignore `Many` constructor completely, returning `VNothing`.
`viewSnoc` violated internal invariant of `Many` being a non-empty list.
- - - - -
48ab9ca5 by Nicolas Trangez at 2022-10-04T20:34:10-04:00
chore: extend `.editorconfig` for C files
- - - - -
b8df5c72 by Brandon Chinn at 2022-10-04T20:34:46-04:00
Fix docs for pattern synonyms
- - - - -
463ffe02 by Oleg Grenrus at 2022-10-04T20:35:24-04:00
Use sameByteArray# in sameByteArray
- - - - -
fbe1e86e by Pierre Le Marre at 2022-10-05T15:58:43+02:00
Minor fixes following Unicode 15.0.0 update
- Fix changelog for Unicode 15.0.0
- Fix the checksums of the downloaded Unicode files, in base's tool: "ucd2haskell".
- - - - -
8a31d02e by Cheng Shao at 2022-10-05T20:40:41-04:00
rts: don't enforce aligned((8)) on 32-bit targets
We simply need to align to the word size for pointer tagging to work. On
32-bit targets, aligned((8)) is wasteful.
- - - - -
532de368 by Ryan Scott at 2022-10-06T07:45:46-04:00
Export symbolSing, SSymbol, and friends (CLC#85)
This implements this Core Libraries Proposal:
https://github.com/haskell/core-libraries-committee/issues/85
In particular, it:
1. Exposes the `symbolSing` method of `KnownSymbol`,
2. Exports the abstract `SSymbol` type used in `symbolSing`, and
3. Defines an API for interacting with `SSymbol`.
This also makes corresponding changes for `natSing`/`KnownNat`/`SNat` and
`charSing`/`KnownChar`/`SChar`. This fixes #15183 and addresses part (2)
of #21568.
- - - - -
d83a92e6 by sheaf at 2022-10-07T07:36:30-04:00
Remove mention of make from README.md
- - - - -
945e8e49 by Andrew Lelechenko at 2022-10-10T17:13:31-04:00
Add a newline before since pragma in Data.Array.Byte
- - - - -
44fcdb04 by Vladislav Zavialov at 2022-10-10T17:14:06-04:00
Parser/PostProcess: rename failOp* functions
There are three functions named failOp* in the parser:
failOpNotEnabledImportQualifiedPost
failOpImportQualifiedTwice
failOpFewArgs
Only the last one has anything to do with operators. The other two
were named this way either by mistake or due to a misunderstanding of
what "op" stands for. This small patch corrects this.
- - - - -
96d32ff2 by Simon Peyton Jones at 2022-10-10T22:30:21+01:00
Make rewrite rules "win" over inlining
If a rewrite rule and a rewrite rule compete in the simplifier, this
patch makes sure that the rewrite rule "win". That is, in general
a bit fragile, but it's a huge help when making specialisation work
reliably, as #21851 and #22097 showed.
The change is fairly straightforwad, and documented in
Note [Rewrite rules and inlining]
in GHC.Core.Opt.Simplify.Iteration.
Compile-times change, up and down a bit -- in some cases because
we get better specialisation. But the payoff (more reliable
specialisation) is large.
Metrics: compile_time/bytes allocated
-----------------------------------------------
T10421(normal) +3.7% BAD
T10421a(normal) +5.5%
T13253(normal) +1.3%
T14052(ghci) +1.8%
T15304(normal) -1.4%
T16577(normal) +3.1% BAD
T17516(normal) +2.3%
T17836(normal) -1.9%
T18223(normal) -1.8%
T8095(normal) -1.3%
T9961(normal) +2.5% BAD
geo. mean +0.0%
minimum -1.9%
maximum +5.5%
Nofib results are (bytes allocated)
+-------------------------------++----------+
| ||tsv (rel) |
+===============================++==========+
| imaginary/paraffins || +0.27% |
| imaginary/rfib || -0.04% |
| real/anna || +0.02% |
| real/fem || -0.04% |
| real/fluid || +1.68% |
| real/gamteb || -0.34% |
| real/gg || +1.54% |
| real/hidden || -0.01% |
| real/hpg || -0.03% |
| real/infer || -0.03% |
| real/prolog || +0.02% |
| real/veritas || -0.47% |
| shootout/fannkuch-redux || -0.03% |
| shootout/k-nucleotide || -0.02% |
| shootout/n-body || -0.06% |
| shootout/spectral-norm || -0.01% |
| spectral/cryptarithm2 || +1.25% |
| spectral/fibheaps || +18.33% |
| spectral/last-piece || -0.34% |
+===============================++==========+
| geom mean || +0.17% |
There are extensive notes in !8897 about the regressions.
Briefly
* fibheaps: there was a very delicately balanced inlining that
tipped over the wrong way after this change.
* cryptarithm2 and paraffins are caused by #22274, which is
a separate issue really. (I.e. the right fix is *not* to
make inlining "win" over rules.)
So I'm accepting these changes
Metric Increase:
T10421
T16577
T9961
- - - - -
ed4b5885 by Joachim Breitner at 2022-10-10T23:16:11-04:00
Utils.JSON: do not escapeJsonString in ToJson String instance
as `escapeJsonString` is used in `renderJSON`, so the `JSString`
constructor is meant to carry the unescaped string.
- - - - -
fbb88740 by Matthew Pickering at 2022-10-11T12:48:45-04:00
Tidy implicit binds
We want to put implicit binds into fat interface files, so the easiest
thing to do seems to be to treat them uniformly with other binders.
- - - - -
e058b138 by Matthew Pickering at 2022-10-11T12:48:45-04:00
Interface Files with Core Definitions
This commit adds three new flags
* -fwrite-if-simplified-core: Writes the whole core program into an interface
file
* -fbyte-code-and-object-code: Generate both byte code and object code
when compiling a file
* -fprefer-byte-code: Prefer to use byte-code if it's available when
running TH splices.
The goal for including the core bindings in an interface file is to be able to restart the compiler pipeline
at the point just after simplification and before code generation. Once compilation is
restarted then code can be created for the byte code backend.
This can significantly speed up
start-times for projects in GHCi. HLS already implements its own version of these extended interface
files for this reason.
Preferring to use byte-code means that we can avoid some potentially
expensive code generation steps (see #21700)
* Producing object code is much slower than producing bytecode, and normally you
need to compile with `-dynamic-too` to produce code in the static and dynamic way, the
dynamic way just for Template Haskell execution when using a dynamically linked compiler.
* Linking many large object files, which happens once per splice, can be quite
expensive compared to linking bytecode.
And you can get GHC to compile the necessary byte code so
`-fprefer-byte-code` has access to it by using
`-fbyte-code-and-object-code`.
Fixes #21067
- - - - -
9789ea8e by Matthew Pickering at 2022-10-11T12:48:45-04:00
Teach -fno-code about -fprefer-byte-code
This patch teachs the code generation logic of -fno-code about
-fprefer-byte-code, so that if we need to generate code for a module
which prefers byte code, then we generate byte code rather than object
code.
We keep track separately which modules need object code and which byte
code and then enable the relevant code generation for each. Typically
the option will be enabled globally so one of these sets should be empty
and we will just turn on byte code or object code generation.
We also fix the bug where we would generate code for a module which
enables Template Haskell despite the fact it was unecessary.
Fixes #22016
- - - - -
caced757 by Simon Peyton Jones at 2022-10-11T12:49:21-04:00
Don't keep exit join points so much
We were religiously keeping exit join points throughout, which
had some bad effects (#21148, #22084).
This MR does two things:
* Arranges that exit join points are inhibited from inlining
only in /one/ Simplifier pass (right after Exitification).
See Note [Be selective about not-inlining exit join points]
in GHC.Core.Opt.Exitify
It's not a big deal, but it shaves 0.1% off compile times.
* Inline used-once non-recursive join points very aggressively
Given join j x = rhs in
joinrec k y = ....j x....
where this is the only occurrence of `j`, we want to inline `j`.
(Unless sm_keep_exits is on.)
See Note [Inline used-once non-recursive join points] in
GHC.Core.Opt.Simplify.Utils
This is just a tidy-up really. It doesn't change allocation, but
getting rid of a binding is always good.
Very effect on nofib -- some up and down.
- - - - -
284cf387 by Simon Peyton Jones at 2022-10-11T12:49:21-04:00
Make SpecConstr bale out less often
When doing performance debugging on #22084 / !8901, I found that the
algorithm in SpecConstr.decreaseSpecCount was so aggressive that if
there were /more/ specialisations available for an outer function,
that could more or less kill off specialisation for an /inner/
function. (An example was in nofib/spectral/fibheaps.)
This patch makes it a bit more aggressive, by dividing by 2, rather
than by the number of outer specialisations.
This makes the program bigger, temporarily:
T19695(normal) ghc/alloc +11.3% BAD
because we get more specialisation. But lots of other programs
compile a bit faster and the geometric mean in perf/compiler
is 0.0%.
Metric Increase:
T19695
- - - - -
66af1399 by Cheng Shao at 2022-10-11T12:49:59-04:00
CmmToC: emit explicit tail calls when the C compiler supports it
Clang 13+ supports annotating a return statement using the musttail
attribute, which guarantees that it lowers to a tail call if compilation
succeeds.
This patch takes advantage of that feature for the unregisterised code
generator. The configure script tests availability of the musttail
attribute, if it's available, the Cmm tail calls will become C tail
calls that avoids the mini interpreter trampoline overhead. Nothing is
affected if the musttail attribute is not supported.
Clang documentation:
https://clang.llvm.org/docs/AttributeReference.html#musttail
- - - - -
7f0decd5 by Matthew Pickering at 2022-10-11T12:50:40-04:00
Don't include BufPos in interface files
Ticket #22162 pointed out that the build directory was leaking into the
ABI hash of a module because the BufPos depended on the location of the
build tree.
BufPos is only used in GHC.Parser.PostProcess.Haddock, and the
information doesn't need to be propagated outside the context of a
module.
Fixes #22162
- - - - -
dce9f320 by Cheng Shao at 2022-10-11T12:51:19-04:00
CLabel: fix isInfoTableLabel
isInfoTableLabel does not take Cmm info table into account. This patch is required for data section layout of wasm32 NCG to work.
- - - - -
da679f2e by Andrew Lelechenko at 2022-10-11T18:02:59-04:00
Extend documentation for Data.List, mostly wrt infinite lists
- - - - -
9c099387 by jwaldmann at 2022-10-11T18:02:59-04:00
Expand comment for Data.List.permutations
- - - - -
d3863cb7 by Andrew Lelechenko at 2022-10-11T18:03:37-04:00
ByteArray# is unlifted, not unboxed
- - - - -
f6260e8b by Ben Gamari at 2022-10-11T23:45:10-04:00
rts: Add missing declaration of stg_noDuplicate
- - - - -
69ccec2c by Ben Gamari at 2022-10-11T23:45:10-04:00
base: Move CString, CStringLen to GHC.Foreign
- - - - -
f6e8feb4 by Ben Gamari at 2022-10-11T23:45:10-04:00
base: Move IPE helpers to GHC.InfoProv
- - - - -
866c736e by Ben Gamari at 2022-10-11T23:45:10-04:00
rts: Refactor IPE tracing support
- - - - -
6b0d2022 by Ben Gamari at 2022-10-11T23:45:10-04:00
Refactor IPE initialization
Here we refactor the representation of info table provenance information
in object code to significantly reduce its size and link-time impact.
Specifically, we deduplicate strings and represent them as 32-bit
offsets into a common string table.
In addition, we rework the registration logic to eliminate allocation
from the registration path, which is run from a static initializer where
things like allocation are technically undefined behavior (although it
did previously seem to work). For similar reasons we eliminate lock
usage from registration path, instead relying on atomic CAS.
Closes #22077.
- - - - -
9b572d54 by Ben Gamari at 2022-10-11T23:45:10-04:00
Separate IPE source file from span
The source file name can very often be shared across many IPE entries
whereas the source coordinates are generally unique. Separate the two to
exploit sharing of the former.
- - - - -
27978ceb by Krzysztof Gogolewski at 2022-10-11T23:45:46-04:00
Make Cmm Lint messages use dump style
Lint errors indicate an internal error in GHC, so it makes sense to use
it instead of the user style. This is consistent with Core Lint and STG Lint:
https://gitlab.haskell.org/ghc/ghc/-/blob/22096652/compiler/GHC/Core/Lint.h…
https://gitlab.haskell.org/ghc/ghc/-/blob/22096652/compiler/GHC/Stg/Lint.hs…
Fixes #22218.
- - - - -
64a390d9 by Bryan Richter at 2022-10-12T09:52:51+03:00
Mark T7919 as fragile
On x86_64-linux, T7919 timed out ~30 times during July 2022.
And again ~30 times in September 2022.
- - - - -
481467a5 by Ben Gamari at 2022-10-12T08:08:37-04:00
rts: Don't hint inlining of appendToRunQueue
These hints have resulted in compile-time warnings due to failed
inlinings for quite some time. Moreover, it's quite unlikely that
inlining them is all that beneficial given that they are rather sizeable
functions.
Resolves #22280.
- - - - -
81915089 by Curran McConnell at 2022-10-12T16:32:26-04:00
remove name shadowing
- - - - -
626652f7 by Tamar Christina at 2022-10-12T16:33:13-04:00
winio: do not re-translate input when handle is uncooked
- - - - -
5172789a by Charles Taylor at 2022-10-12T16:33:57-04:00
Unrestricted OverloadedLabels (#11671)
Implements GHC proposal:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0170-u…
- - - - -
ce293908 by Andreas Klebinger at 2022-10-13T05:58:19-04:00
Add a perf test for the generics code pattern from #21839.
This code showed a strong shift between compile time (got worse) and
run time (got a lot better) recently which is perfectly acceptable.
However it wasn't clear why the compile time regression was happening
initially so I'm adding this test to make it easier to track such changes
in the future.
- - - - -
78ab7afe by Ben Gamari at 2022-10-13T05:58:56-04:00
rts/linker: Consolidate initializer/finalizer handling
Here we extend our treatment of initializer/finalizer priorities to
include ELF and in so doing refactor things to share the implementation
with PEi386. As well, I fix a subtle misconception of the ordering
behavior for `.ctors`.
Fixes #21847.
- - - - -
44692713 by Ben Gamari at 2022-10-13T05:58:56-04:00
rts/linker: Add support for .fini sections
- - - - -
beebf546 by Simon Hengel at 2022-10-13T05:59:37-04:00
Update phases.rst
(the name of the original source file is $1, not $2)
- - - - -
eda6c05e by Finley McIlwaine at 2022-10-13T06:00:17-04:00
Clearer error msg for newtype GADTs with defaulted kind
When a newtype introduces GADT eq_specs due to a defaulted
RuntimeRep, we detect this and print the error message with
explicit kinds.
This also refactors newtype type checking to use the new
diagnostic infra.
Fixes #21447
- - - - -
43ab435a by Pierre Le Marre at 2022-10-14T07:45:43-04:00
Add standard Unicode case predicates isUpperCase and isLowerCase.
These predicates use the standard Unicode case properties and are more intuitive than isUpper and isLower.
Approved by CLC in https://github.com/haskell/core-libraries-committee/issues/90#issuecomment-….
Fixes #14589
- - - - -
aec5a443 by Andrew Lelechenko at 2022-10-14T07:46:21-04:00
Add type signatures in where-clause of Data.List.permutations
The type of interleave' is very much revealing, otherwise it's extremely tough to decipher.
- - - - -
ee0deb80 by Ben Gamari at 2022-10-14T18:29:20-04:00
rts: Use pthread_setname_np correctly on Darwin
As noted in #22206, pthread_setname_np on Darwin only supports
setting the name of the calling thread. Consequently we must introduce
a trampoline which first sets the thread name before entering the thread
entrypoint.
- - - - -
8eff62a4 by Ben Gamari at 2022-10-14T18:29:57-04:00
testsuite: Add test for #22282
This will complement mpickering's more general port of foundation's
numerical testsuite, providing a test for the specific case found
in #22282.
- - - - -
62a55001 by Ben Gamari at 2022-10-14T18:29:57-04:00
ncg/aarch64: Fix sub-word sign extension yet again
In adc7f108141a973b6dcb02a7836eed65d61230e8 we fixed a number of issues
to do with sign extension in the AArch64 NCG found by ghc/test-primops>.
However, this patch made a critical error, assuming that getSomeReg
would allocate a fresh register for the result of its evaluation.
However, this is not the case as `getSomeReg (CmmReg r) == r`.
Consequently, any mutation of the register returned by `getSomeReg` may
have unwanted side-effects on other expressions also mentioning `r`. In
the fix listed above, this manifested as the registers containing the
operands of binary arithmetic operations being incorrectly
sign-extended. This resulted in #22282.
Sadly, the rather simple structure of the tests generated
by `test-primops` meant that this particular case was not exercised.
Even more surprisingly, none of our testsuite caught this case.
Here we fix this by ensuring that intermediate sign extension is
performed in a fresh register.
Fixes #22282.
- - - - -
54e41b16 by Teo Camarasu at 2022-10-15T18:09:24+01:00
rts: ensure we are below maxHeapSize after returning megablocks
When the heap is heavily block fragmented the live byte size might be
low while the memory usage is high. We want to ensure that heap overflow
triggers in these cases.
We do so by checking that we can return enough megablocks to
under maxHeapSize at the end of GC.
- - - - -
29bb90db by Teo Camarasu at 2022-10-15T18:09:24+01:00
rts: trigger a major collection if megablock usage exceeds maxHeapSize
When the heap is suffering from block fragmentation, live bytes might be
low while megablock usage is high.
If megablock usage exceeds maxHeapSize, we want to trigger a major GC to
try to recover some memory otherwise we will die from a heapOverflow at
the end of the GC.
Fixes #21927
- - - - -
4a4641ca by Teo Camarasu at 2022-10-15T18:11:29+01:00
Add realease note for #21927
- - - - -
c1e5719a by Sebastian Graf at 2022-10-17T11:58:46-04:00
DmdAnal: Look through unfoldings of DataCon wrappers (#22241)
Previously, the demand signature we computed upfront for a DataCon wrapper
lacked boxity information and was much less precise than the demand transformer
for the DataCon worker.
In this patch we adopt the solution to look through unfoldings of DataCon
wrappers during Demand Analysis, but still attach a demand signature for other
passes such as the Simplifier.
See `Note [DmdAnal for DataCon wrappers]` for more details.
Fixes #22241.
- - - - -
8c72411d by Gergő Érdi at 2022-10-17T19:20:04-04:00
Add `Enum (Down a)` instance that swaps `succ` and `pred`
See https://github.com/haskell/core-libraries-committee/issues/51 for
discussion. The key points driving the implementation are the following
two ideas:
* For the `Int` type, `comparing (complement @Int)` behaves exactly as
an order-swapping `compare @Int`.
* `enumFrom @(Down a)` can be implemented in terms of `enumFromThen @a`,
if only the corner case of starting at the very end is handled specially
- - - - -
d80ad2f4 by Alan Zimmerman at 2022-10-17T19:20:40-04:00
Update the check-exact infrastructure to match ghc-exactprint
GHC tests the exact print annotations using the contents of
utils/check-exact.
The same functionality is provided via
https://github.com/alanz/ghc-exactprint
The latter was updated to ensure it works with all of the files on
hackage when 9.2 was released, as well as updated to ensure users of
the library could work properly (apply-refact, retrie, etc).
This commit brings the changes from ghc-exactprint into
GHC/utils/check-exact, adapting for the changes to master.
Once it lands, it will form the basis for the 9.4 version of
ghc-exactprint.
See also discussion around this process at #21355
- - - - -
08ab5419 by Andreas Klebinger at 2022-10-17T19:21:15-04:00
Avoid allocating intermediate lists for non recursive bindings.
We do so by having an explicit folding function that doesn't need to
allocate intermediate lists first.
Fixes #22196
- - - - -
ff6275ef by Andreas Klebinger at 2022-10-17T19:21:52-04:00
Testsuite: Add a new tables_next_to_code predicate.
And use it to avoid T21710a failing on non-tntc archs.
Fixes #22169
- - - - -
abb82f38 by Eric Lindblad at 2022-10-17T19:22:33-04:00
example rewrite
- - - - -
39beb801 by Eric Lindblad at 2022-10-17T19:22:33-04:00
remove redirect
- - - - -
0d9fb651 by Eric Lindblad at 2022-10-17T19:22:33-04:00
use heredoc
- - - - -
0fa2d185 by Matthew Pickering at 2022-10-17T19:23:10-04:00
testsuite: Fix typo when setting llvm_ways
Since 2014 llvm_ways has been set to [] so none of the tests which use
only_ways(llvm_ways) have worked as expected.
Hopefully the tests still pass with this typo fix!
- - - - -
ced664a2 by Krzysztof Gogolewski at 2022-10-17T19:23:10-04:00
Fix T15155l not getting -fllvm
- - - - -
0ac60423 by Andreas Klebinger at 2022-10-18T03:34:47-04:00
Fix GHCis interaction with tag inference.
I had assumed that wrappers were not inlined in interactive mode.
Meaning we would always execute the compiled wrapper which properly
takes care of upholding the strict field invariant.
This turned out to be wrong. So instead we now run tag inference even
when we generate bytecode. In that case only for correctness not
performance reasons although it will be still beneficial for runtime
in some cases.
I further fixed a bug where GHCi didn't tag nullary constructors
properly when used as arguments. Which caused segfaults when calling
into compiled functions which expect the strict field invariant to
be upheld.
Fixes #22042 and #21083
-------------------------
Metric Increase:
T4801
Metric Decrease:
T13035
-------------------------
- - - - -
9ecd1ac0 by M Farkas-Dyck at 2022-10-18T03:35:38-04:00
Make `Functor` a superclass of `TrieMap`, which lets us derive the `map` functions.
- - - - -
f60244d7 by Ben Gamari at 2022-10-18T03:36:15-04:00
configure: Bump minimum bootstrap GHC version
Fixes #22245
- - - - -
ba4bd4a4 by Matthew Pickering at 2022-10-18T03:36:55-04:00
Build System: Remove out-of-date comment about make build system
Both make and hadrian interleave compilation of modules of different
modules and don't respect the package boundaries. Therefore I just
remove this comment which points out this "difference".
Fixes #22253
- - - - -
e1bbd368 by Matthew Pickering at 2022-10-18T16:15:49+02:00
Allow configuration of error message printing
This MR implements the idea of #21731 that the printing of a diagnostic
method should be configurable at the printing time.
The interface of the `Diagnostic` class is modified from:
```
class Diagnostic a where
diagnosticMessage :: a -> DecoratedSDoc
diagnosticReason :: a -> DiagnosticReason
diagnosticHints :: a -> [GhcHint]
```
to
```
class Diagnostic a where
type DiagnosticOpts a
defaultDiagnosticOpts :: DiagnosticOpts a
diagnosticMessage :: DiagnosticOpts a -> a -> DecoratedSDoc
diagnosticReason :: a -> DiagnosticReason
diagnosticHints :: a -> [GhcHint]
```
and so each `Diagnostic` can implement their own configuration record
which can then be supplied by a client in order to dictate how to print
out the error message.
At the moment this only allows us to implement #21722 nicely but in
future it is more natural to separate the configuration of how much
information we put into an error message and how much we decide to print
out of it.
Updates Haddock submodule
- - - - -
99dc3e3d by Matthew Pickering at 2022-10-18T16:15:53+02:00
Add -fsuppress-error-contexts to disable printing error contexts in errors
In many development environments, the source span is the primary means
of seeing what an error message relates to, and the In the expression:
and In an equation for: clauses are not particularly relevant. However,
they can grow to be quite long, which can make the message itself both
feel overwhelming and interact badly with limited-space areas.
It's simple to implement this flag so we might as well do it and give
the user control about how they see their messages.
Fixes #21722
- - - - -
5b3a992f by Dai at 2022-10-19T10:45:45-04:00
Add VecSlot for unboxed sums of SIMD vectors
This patch adds the missing `VecRep` case to `primRepSlot` function and
all the necessary machinery to carry this new `VecSlot` through code
generation. This allows programs involving unboxed sums of SIMD vectors
to be written and compiled.
Fixes #22187
- - - - -
6d7d9181 by sheaf at 2022-10-19T10:45:45-04:00
Remove SIMD conversions
This patch makes it so that packing/unpacking SIMD
vectors always uses the right sized types, e.g.
unpacking a Word16X4# will give a tuple of Word16#s.
As a result, we can get rid of the conversion instructions
that were previously required.
Fixes #22296
- - - - -
3be48877 by sheaf at 2022-10-19T10:45:45-04:00
Cmm Lint: relax SIMD register assignment check
As noted in #22297, SIMD vector registers can be used
to store different kinds of values, e.g. xmm1 can be used
both to store integer and floating point values.
The Cmm type system doesn't properly account for this, so
we weaken the Cmm register assignment lint check to only
compare widths when comparing a vector type with its
allocated vector register.
- - - - -
f7b7a312 by sheaf at 2022-10-19T10:45:45-04:00
Disable some SIMD tests on non-X86 architectures
- - - - -
83638dce by M Farkas-Dyck at 2022-10-19T10:46:29-04:00
Scrub various partiality involving lists (again).
Lets us avoid some use of `head` and `tail`, and some panics.
- - - - -
c3732c62 by M Farkas-Dyck at 2022-10-19T10:47:13-04:00
Enforce invariant of `ListBag` constructor.
- - - - -
488d3631 by Andrew Lelechenko at 2022-10-19T10:47:52-04:00
More precise types for fields of OverlappingInstances and UnsafeOverlap in TcSolverReportMsg
It's clear from asserts in `GHC.Tc.Errors` that `overlappingInstances_matches`
and `unsafeOverlapped` are supposed to be non-empty, and `unsafeOverlap_matches`
contains a single instance, but these invariants are immediately lost afterwards
and not encoded in types. This patch enforces the invariants by pattern matching
and makes types more precise, avoiding asserts and partial functions such as `head`.
- - - - -
607ce263 by sheaf at 2022-10-19T10:47:52-04:00
Rename unsafeOverlap_matches -> unsafeOverlap_match in UnsafeOverlap
- - - - -
1fab9598 by Matthew Pickering at 2022-10-19T10:48:29-04:00
Add SpliceTypes test for hie files
This test checks that typed splices and quotes get the right type
information when used in hiefiles.
See #21619
- - - - -
a8b52786 by Jan Hrček at 2022-10-19T10:49:09-04:00
Small language fixes in 'Using GHC'
- - - - -
1dab1167 by Gergő Érdi at 2022-10-19T10:49:51-04:00
Fix typo in `Opt_WriteIfSimplifiedCore`'s name
- - - - -
b17cfc9c by sheaf at 2022-10-19T10:50:37-04:00
TyEq:N assertion: only for saturated applications
The assertion that checked TyEq:N in canEqCanLHSFinish incorrectly
triggered in the case of an unsaturated newtype TyCon heading the RHS,
even though we can't unwrap such an application. Now, we only trigger
an assertion failure in case of a saturated application of a newtype
TyCon.
Fixes #22310
- - - - -
ff6f2228 by M Farkas-Dyck at 2022-10-20T16:15:51-04:00
CoreToStg: purge `DynFlags`.
- - - - -
1ebd521f by Matthew Pickering at 2022-10-20T16:16:27-04:00
ci: Make fat014 test robust
For some reason I implemented this as a makefile test rather than a
ghci_script test. Hopefully making it a ghci_script test makes it more
robust.
Fixes #22313
- - - - -
8cd6f435 by Curran McConnell at 2022-10-21T02:58:01-04:00
remove a no-warn directive from GHC.Cmm.ContFlowOpt
This patch is motivated by the desire to remove the {-# OPTIONS_GHC
-fno-warn-incomplete-patterns #-} directive at the top of
GHC.Cmm.ContFlowOpt. (Based on the text in this coding standards doc, I
understand it's a goal of the project to remove such directives.) I
chose this task because I'm a new contributor to GHC, and it seemed like
a good way to get acquainted with the patching process.
In order to address the warning that arose when I removed the no-warn
directive, I added a case to removeUnreachableBlocksProc to handle the
CmmData constructor. Clearly, since this partial function has not been
erroring out in the wild, its inputs are always in practice wrapped by
the CmmProc constructor. Therefore the CmmData case is handled by a
precise panic (which is an improvement over the partial pattern match
from before).
- - - - -
a2af7c4c by Nicolas Trangez at 2022-10-21T02:58:39-04:00
build: get rid of `HAVE_TIME_H`
As advertized by `autoreconf`:
> All current systems provide time.h; it need not be checked for.
Hence, remove the check for it in `configure.ac` and remove conditional
inclusion of the header in `HAVE_TIME_H` blocks where applicable.
The `time.h` header was being included in various source files without a
`HAVE_TIME_H` guard already anyway.
- - - - -
25cdc630 by Nicolas Trangez at 2022-10-21T02:58:39-04:00
rts: remove use of `TIME_WITH_SYS_TIME`
`autoreconf` will insert an `m4_warning` when the obsolescent
`AC_HEADER_TIME` macro is used:
> Update your code to rely only on HAVE_SYS_TIME_H,
> then remove this warning and the obsolete code below it.
> All current systems provide time.h; it need not be checked for.
> Not all systems provide sys/time.h, but those that do, all allow
> you to include it and time.h simultaneously.
Presence of `sys/time.h` was already checked in an earlier
`AC_CHECK_HEADERS` invocation, so `AC_HEADER_TIME` can be dropped and
guards relying on `TIME_WITH_SYS_TIME` can be reworked to
(unconditionally) include `time.h` and include `sys/time.h` based on
`HAVE_SYS_TIME_H`.
Note the documentation of `AC_HEADER_TIME` in (at least) Autoconf 2.67
says
> This macro is obsolescent, as current systems can include both files
> when they exist. New programs need not use this macro.
- - - - -
1fe7921c by Eric Lindblad at 2022-10-21T02:59:21-04:00
runhaskell
- - - - -
e3b3986e by David Feuer at 2022-10-21T03:00:00-04:00
Document how to quote certain names with spaces
Quoting a name for Template Haskell is a bit tricky if the second
character of that name is a single quote. The User's Guide falsely
claimed that it was impossible. Document how to do it.
Fixes #22236
- - - - -
0eba81e8 by Krzysztof Gogolewski at 2022-10-21T03:00:00-04:00
Fix syntax
- - - - -
a4dbd102 by Ben Gamari at 2022-10-21T09:11:12-04:00
Fix manifest filename when writing Windows .rc files
As noted in #12971, we previously used `show` which resulted in
inappropriate escaping of non-ASCII characters.
- - - - -
30f0d9a9 by Ben Gamari at 2022-10-21T09:11:12-04:00
Write response files in UTF-8 on Windows
This reverts the workaround introduced in
f63c8ef33ec9666688163abe4ccf2d6c0428a7e7, which taught our response file
logic to write response files with the `latin1` encoding to workaround
`gcc`'s lacking Unicode support. This is now no longer necessary (and in
fact actively unhelpful) since we rather use Clang.
- - - - -
b8304648 by Matthew Farkas-Dyck at 2022-10-21T09:11:56-04:00
Scrub some partiality in `GHC.Core.Opt.Simplify.Utils`.
- - - - -
09ec7de2 by Teo Camarasu at 2022-10-21T13:23:07-04:00
template-haskell: Improve documentation of strictness annotation types
Before it was undocumentated that DecidedLazy can be returned by
reifyConStrictness for strict fields. This can happen when a field has
an unlifted type or its the single field of a newtype constructor.
Fixes #21380
- - - - -
88172069 by M Farkas-Dyck at 2022-10-21T13:23:51-04:00
Delete `eqExpr`, since GHC 9.4 has been released.
- - - - -
86e6549e by Ömer Sinan Ağacan at 2022-10-22T07:41:30-04:00
Introduce a standard thunk for allocating strings
Currently for a top-level closure in the form
hey = unpackCString# x
we generate code like this:
Main.hey_entry() // [R1]
{ info_tbls: [(c2T4,
label: Main.hey_info
rep: HeapRep static { Thunk }
srt: Nothing)]
stack_info: arg_space: 8 updfr_space: Just 8
}
{offset
c2T4: // global
_rqm::P64 = R1;
if ((Sp + 8) - 24 < SpLim) (likely: False) goto c2T5; else goto c2T6;
c2T5: // global
R1 = _rqm::P64;
call (stg_gc_enter_1)(R1) args: 8, res: 0, upd: 8;
c2T6: // global
(_c2T1::I64) = call "ccall" arg hints: [PtrHint,
PtrHint] result hints: [PtrHint] newCAF(BaseReg, _rqm::P64);
if (_c2T1::I64 == 0) goto c2T3; else goto c2T2;
c2T3: // global
call (I64[_rqm::P64])() args: 8, res: 0, upd: 8;
c2T2: // global
I64[Sp - 16] = stg_bh_upd_frame_info;
I64[Sp - 8] = _c2T1::I64;
R2 = hey1_r2Gg_bytes;
Sp = Sp - 16;
call GHC.CString.unpackCString#_info(R2) args: 24, res: 0, upd: 24;
}
}
This code is generated for every string literal. Only difference between
top-level closures like this is the argument for the bytes of the string
(hey1_r2Gg_bytes in the code above).
With this patch we introduce a standard thunk in the RTS, called
stg_MK_STRING_info, that does what `unpackCString# x` does, except it
gets the bytes address from the payload. Using this, for the closure
above, we generate this:
Main.hey_closure" {
Main.hey_closure:
const stg_MK_STRING_info;
const 0; // padding for indirectee
const 0; // static link
const 0; // saved info
const hey1_r1Gg_bytes; // the payload
}
This is much smaller in code.
Metric Decrease:
T10421
T11195
T12150
T12425
T16577
T18282
T18698a
T18698b
Co-Authored By: Ben Gamari <ben(a)well-typed.com>
- - - - -
1937016b by Andreas Klebinger at 2022-10-22T07:42:06-04:00
hadrian: Improve error for wrong key/value errors.
- - - - -
11fe42d8 by Vladislav Zavialov at 2022-10-23T00:11:50+03:00
Class layout info (#19623)
Updates the haddock submodule.
- - - - -
f0a90c11 by Sven Tennie at 2022-10-24T00:12:51-04:00
Pin used way for test cloneMyStack (#21977)
cloneMyStack checks the order of closures on the cloned stack. This may
change for different ways. Thus we limit this test to one way (normal).
- - - - -
0614e74d by Aaron Allen at 2022-10-24T17:11:21+02:00
Convert Diagnostics in GHC.Tc.Gen.Splice (#20116)
Replaces uses of `TcRnUnknownMessage` in `GHC.Tc.Gen.Splice` with
structured diagnostics.
closes #20116
- - - - -
8d2dbe2d by Andreas Klebinger at 2022-10-24T15:59:41-04:00
Improve stg lint for unboxed sums.
It now properly lints cases where sums end up distributed
over multiple args after unarise.
Fixes #22026.
- - - - -
41406da5 by Simon Peyton Jones at 2022-10-25T18:07:03-04:00
Fix binder-swap bug
This patch fixes #21229 properly, by avoiding doing a
binder-swap on dictionary Ids. This is pretty subtle, and explained
in Note [Care with binder-swap on dictionaries].
Test is already in simplCore/should_run/T21229
This allows us to restore a feature to the specialiser that we had
to revert: see Note [Specialising polymorphic dictionaries].
(This is done in a separate patch.)
I also modularised things, using a new function scrutBinderSwap_maybe
in all the places where we are (effectively) doing a binder-swap,
notably
* Simplify.Iteration.addAltUnfoldings
* SpecConstr.extendCaseBndrs
In Simplify.Iteration.addAltUnfoldings I also eliminated a guard
Many <- idMult case_bndr
because we concluded, in #22123, that it was doing no good.
- - - - -
5a997e16 by Simon Peyton Jones at 2022-10-25T18:07:03-04:00
Make the specialiser handle polymorphic specialisation
Ticket #13873 unexpectedly showed that a SPECIALISE pragma made a
program run (a lot) slower, because less specialisation took place
overall. It turned out that the specialiser was missing opportunities
because of quantified type variables.
It was quite easy to fix. The story is given in
Note [Specialising polymorphic dictionaries]
Two other minor fixes in the specialiser
* There is no benefit in specialising data constructor /wrappers/.
(They can appear overloaded because they are given a dictionary
to store in the constructor.) Small guard in canSpecImport.
* There was a buglet in the UnspecArg case of specHeader, in the
case where there is a dead binder. We need a LitRubbish filler
for the specUnfolding stuff. I expanded
Note [Drop dead args from specialisations] to explain.
There is a 4% increase in compile time for T15164, because we generate
more specialised code. This seems OK.
Metric Increase:
T15164
- - - - -
7f203d00 by Sylvain Henry at 2022-10-25T18:07:43-04:00
Numeric exceptions: replace FFI calls with primops
ghc-bignum needs a way to raise numerical exceptions defined in base
package. At the time we used FFI calls into primops defined in the RTS.
These FFI calls had to be wrapped into hacky bottoming functions because
"foreign import prim" syntax doesn't support giving a bottoming demand
to the foreign call (cf #16929).
These hacky wrapper functions trip up the JavaScript backend (#21078)
because they are polymorphic in their return type. This commit
replaces them with primops very similar to raise# but raising predefined
exceptions.
- - - - -
0988a23d by Sylvain Henry at 2022-10-25T18:08:24-04:00
Enable popcount rewrite rule when cross-compiling
The comment applies only when host's word size < target's word size.
So we can relax the guard.
- - - - -
a2f53ac8 by Sylvain Henry at 2022-10-25T18:09:05-04:00
Add GHC.SysTools.Cpp module
Move doCpp out of the driver to be able to use it in the upcoming JS backend.
- - - - -
1fd7f201 by Ben Gamari at 2022-10-25T18:09:42-04:00
llvm-targets: Add datalayouts for big-endian AArch64 targets
Fixes #22311.
Thanks to @zeldin for the patch.
- - - - -
f5a486eb by Krzysztof Gogolewski at 2022-10-25T18:10:19-04:00
Cleanup String/FastString conversions
Remove unused mkPtrString and isUnderscoreFS.
We no longer use mkPtrString since 1d03d8bef96.
Remove unnecessary conversions between FastString and String and back.
- - - - -
f7bfb40c by Ryan Scott at 2022-10-26T00:01:24-04:00
Broaden the in-scope sets for liftEnvSubst and composeTCvSubst
This patch fixes two distinct (but closely related) buglets that were uncovered
in #22235:
* `liftEnvSubst` used an empty in-scope set, which was not wide enough to cover
the variables in the range of the substitution. This patch fixes this by
populating the in-scope set from the free variables in the range of the
substitution.
* `composeTCvSubst` applied the first substitution argument to the range of the
second substitution argument, but the first substitution's in-scope set was
not wide enough to cover the range of the second substutition. We similarly
fix this issue in this patch by widening the first substitution's in-scope set
before applying it.
Fixes #22235.
- - - - -
0270cc54 by Vladislav Zavialov at 2022-10-26T00:02:01-04:00
Introduce TcRnWithHsDocContext (#22346)
Before this patch, GHC used withHsDocContext to attach an HsDocContext
to an error message:
addErr $ mkTcRnUnknownMessage $ mkPlainError noHints (withHsDocContext ctxt msg)
The problem with this approach is that it only works with
TcRnUnknownMessage. But could we attach an HsDocContext to a
structured error message in a generic way? This patch solves
the problem by introducing a new constructor to TcRnMessage:
data TcRnMessage where
...
TcRnWithHsDocContext :: !HsDocContext -> !TcRnMessage -> TcRnMessage
...
- - - - -
9ab31f42 by Sylvain Henry at 2022-10-26T09:32:20+02:00
Testsuite: more precise test options
Necessary for newer cross-compiling backends (JS, Wasm) that don't
support TH yet.
- - - - -
f60a1a62 by Vladislav Zavialov at 2022-10-26T12:17:14-04:00
Use TcRnVDQInTermType in noNestedForallsContextsErr (#20115)
When faced with VDQ in the type of a term, GHC generates the following
error message:
Illegal visible, dependent quantification in the type of a term
(GHC does not yet support this)
Prior to this patch, there were two ways this message could have been
generated and represented:
1. with the dedicated constructor TcRnVDQInTermType
(see check_type in GHC.Tc.Validity)
2. with the transitional constructor TcRnUnknownMessage
(see noNestedForallsContextsErr in GHC.Rename.Utils)
Not only this led to duplication of code generating the final SDoc,
it also made it tricky to track the origin of the error message.
This patch fixes the problem by using TcRnVDQInTermType exclusively.
- - - - -
223e159d by Owen Shepherd at 2022-10-27T13:54:33-04:00
Remove source location information from interface files
This change aims to minimize source location information leaking
into interface files, which makes ABI hashes dependent on the
build location.
The `Binary (Located a)` instance has been removed completely.
It seems that the HIE interface still needs the ability to
serialize SrcSpans, but by wrapping the instances, it should
be a lot more difficult to inadvertently add source location
information.
- - - - -
22e3deb9 by Simon Peyton Jones at 2022-10-27T13:55:37-04:00
Add missing dict binds to specialiser
I had forgotten to add the auxiliary dict bindings to the
/unfolding/ of a specialised function. This caused #22358,
which reports failures when compiling Hackage packages
fixed-vector
indexed-traversable
Regression test T22357 is snarfed from indexed-traversable
- - - - -
a8ed36f9 by Evan Relf at 2022-10-27T13:56:36-04:00
Fix broken link to `async` package
- - - - -
750846cd by Zubin Duggal at 2022-10-28T00:49:22-04:00
Pass correct package db when testing stage1.
It used to pick the db for stage-2 which obviously didn't work.
- - - - -
ad612f55 by Krzysztof Gogolewski at 2022-10-28T00:50:00-04:00
Minor SDoc-related cleanup
* Rename pprCLabel to pprCLabelStyle, and use the name pprCLabel
for a function using CStyle (analogous to pprAsmLabel)
* Move LabelStyle to the CLabel module, it no longer needs to be in Outputable.
* Move calls to 'text' right next to literals, to make sure the text/str
rule is triggered.
* Remove FastString/String roundtrip in Tc.Deriv.Generate
* Introduce showSDocForUser', which abstracts over a pattern in
GHCi.UI
- - - - -
c2872f3f by Bryan Richter at 2022-10-28T11:36:34+03:00
CI: Don't run lint-submods on nightly
Fixes #22325
- - - - -
270037fa by Hécate Moonlight at 2022-10-28T19:46:12-04:00
Start the deprecation process for GHC.Pack
- - - - -
d45d8cb3 by M Farkas-Dyck at 2022-11-01T12:47:21-04:00
Drop a kludge for binutils<2.17, which is now over 10 years old.
- - - - -
8ee8b418 by Nicolas Trangez at 2022-11-01T12:47:58-04:00
rts: `name` argument of `createOSThread` can be `const`
Since we don't intend to ever change the incoming string, declare this
to be true.
Also, in the POSIX implementation, the argument is no longer `STG_UNUSED`
(since ee0deb8054da2a597fc5624469b4c44fd769ada2) in any code path.
See: https://gitlab.haskell.org/ghc/ghc/-/commit/ee0deb8054da2a597fc5624469b4c44…
- - - - -
13b5f102 by Nicolas Trangez at 2022-11-01T12:47:58-04:00
rts: fix lifetime of `start_thread`s `name` value
Since, unlike the code in ee0deb8054da2^, usage of the `name` value
passed to `createOSThread` now outlives said function's lifetime, and
could hence be released by the caller by the time the new thread runs
`start_thread`, it needs to be copied.
See: https://gitlab.haskell.org/ghc/ghc/-/commit/ee0deb8054da2a597fc5624469b4c44…
See: https://gitlab.haskell.org/ghc/ghc/-/merge_requests/9066
- - - - -
edd175c9 by Nicolas Trangez at 2022-11-01T12:47:58-04:00
rts: fix OS thread naming in ticker
Since ee0deb805, the use of `pthread_setname_np` on Darwin was fixed
when invoking `createOSThread`. However, the 'ticker' has some
thread-creation code which doesn't rely on `createOSThread`, yet also
uses `pthread_setname_np`.
This patch enforces all thread creation to go through a single
function, which uses the (correct) thread-naming code introduced in
ee0deb805.
See: https://gitlab.haskell.org/ghc/ghc/-/commit/ee0deb8054da2a597fc5624469b4c44…
See: https://gitlab.haskell.org/ghc/ghc/-/issues/22206
See: https://gitlab.haskell.org/ghc/ghc/-/merge_requests/9066
- - - - -
b7a00113 by Krzysztof Gogolewski at 2022-11-01T12:48:35-04:00
Typo: rename -fwrite-if-simplfied-core to -fwrite-if-simplified-core
- - - - -
30e625e6 by Vladislav Zavialov at 2022-11-01T12:49:10-04:00
ThToHs: fix overzealous parenthesization
Before this patch, when converting from TH.Exp to LHsExpr GhcPs,
the compiler inserted more parentheses than required:
((f a) (b + c)) d
This was happening because the LHS of the function application was
parenthesized as if it was the RHS.
Now we use funPrec and appPrec appropriately and produce sensibly
parenthesized expressions:
f a (b + c) d
I also took the opportunity to remove the special case for LamE,
which was not special at all and simply duplicated code.
- - - - -
0560821f by Simon Peyton Jones at 2022-11-01T12:49:47-04:00
Add accurate skolem info when quantifying
Ticket #22379 revealed that skolemiseQuantifiedTyVar was
dropping the passed-in skol_info on the floor when it encountered
a SkolemTv. Bad! Several TyCons thereby share a single SkolemInfo
on their binders, which lead to bogus error reports.
- - - - -
38d19668 by Fendor at 2022-11-01T12:50:25-04:00
Expose UnitEnvGraphKey for user-code
- - - - -
77e24902 by Simon Peyton Jones at 2022-11-01T12:51:00-04:00
Shrink test case for #22357
Ryan Scott offered a cut-down repro case
(60 lines instead of more than 700 lines)
- - - - -
4521f649 by Simon Peyton Jones at 2022-11-01T12:51:00-04:00
Add two tests for #17366
- - - - -
6b400d26 by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: introduce (and use) `STG_NORETURN`
Instead of sprinkling the codebase with
`GNU(C3)_ATTRIBUTE(__noreturn__)`, add a `STG_NORETURN` macro (for,
basically, the same thing) similar to `STG_UNUSED` and others, and
update the code to use this macro where applicable.
- - - - -
f9638654 by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: consistently use `STG_UNUSED`
- - - - -
81a58433 by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: introduce (and use) `STG_USED`
Similar to `STG_UNUSED`, have a specific macro for
`__attribute__(used)`.
- - - - -
41e1f748 by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: introduce (and use) `STG_MALLOC`
Instead of using `GNUC3_ATTRIBUTE(__malloc__)`, provide a `STG_MALLOC`
macro definition and use it instead.
- - - - -
3a9a8bde by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: use `STG_UNUSED`
- - - - -
9ab999de by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: specify deallocator of allocating functions
This patch adds a new `STG_MALLOC1` macro (and its counterpart
`STG_MALLOC2` for completeness) which allows to specify the deallocation
function to be used with allocations of allocating functions, and
applies it to `stg*allocBytes`.
It also fixes a case where `free` was used to free up an
`stgMallocBytes` allocation, found by the above change.
See: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-ma…
See: https://gitlab.haskell.org/ghc/ghc/-/issues/22381
- - - - -
81c0c7c9 by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: use `alloc_size` attribute
This patch adds the `STG_ALLOC_SIZE1` and `STG_ALLOC_SIZE2` macros which
allow to set the `alloc_size` attribute on functions, when available.
See: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-al…
See: https://gitlab.haskell.org/ghc/ghc/-/issues/22381
- - - - -
99a1d896 by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: add and use `STG_RETURNS_NONNULL`
See: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-re…
See: https://gitlab.haskell.org/ghc/ghc/-/issues/22381
- - - - -
c235b399 by Nicolas Trangez at 2022-11-02T12:06:48-04:00
rts: tag `stgStrndup` as `STG_MALLOC`
See: https://gitlab.haskell.org/ghc/ghc/-/issues/22381
- - - - -
ed81b448 by Oleg Grenrus at 2022-11-02T12:07:27-04:00
Move Symbol implementation note out of public haddock
- - - - -
284fd39c by Ben Gamari at 2022-11-03T01:58:54-04:00
gen-dll: Drop it
Currently it is only used by the make build system, which is soon to be
retired, and it has not built since 41cf758b. We may need to reintroduce
it when dynamic-linking support is introduced on Windows, but we will
cross that bridge once we get there.
Fixes #21753.
- - - - -
24f4f54f by Matthew Pickering at 2022-11-03T01:59:30-04:00
Port foundation numeric tests to GHC testsuite
This commit ports the numeric tests which found a regression in GHC-9.4.
https://github.com/haskell-foundation/foundation/issues/571
Included in the commit is a simple random number generator and
simplified QuickCheck implementation. In future these could be factored
out of this standalone file and reused as a general purpose library
which could be used for other QuickCheck style tests in the testsuite.
See #22282
- - - - -
d51bf7bd by M Farkas-Dyck at 2022-11-03T02:00:13-04:00
git: ignore HIE files.
Cleans up git status if one sets -fwrite-ide-info in hadrian/ghci.
- - - - -
a9fc15b1 by Matthew Pickering at 2022-11-03T02:00:49-04:00
Clarify status of bindings in WholeCoreBindings
Gergo points out that these bindings are tidied, rather than prepd as
the variable claims. Therefore we update the name of the variable to
reflect reality and add a comment to the data type to try to erase any
future confusion.
Fixes #22307
- - - - -
634da448 by Andrew Lelechenko at 2022-11-03T21:25:02+00:00
Fix haddocks for GHC.IORef
- - - - -
31125154 by Andreas Klebinger at 2022-11-03T23:08:09-04:00
Export pprTrace and friends from GHC.Prelude.
Introduces GHC.Prelude.Basic which can be used in modules which are a
dependency of the ppr code.
- - - - -
bdc8cbb3 by Bryan Richter at 2022-11-04T10:27:37+02:00
CI: Allow hadrian-ghc-in-ghci to run in nightlies
Since lint-submods doesn't run in nightlies, hadrian-ghc-in-ghci needs
to mark it as "optional" so it can run if the job doesn't exist.
Fixes #22396.
- - - - -
3c0e3793 by Krzysztof Gogolewski at 2022-11-05T00:29:57-04:00
Minor refactor around FastStrings
Pass FastStrings to functions directly, to make sure the rule
for fsLit "literal" fires.
Remove SDoc indirection in GHCi.UI.Tags and GHC.Unit.Module.Graph.
- - - - -
e41b2f55 by Matthew Pickering at 2022-11-05T14:18:10+00:00
Bump unix submodule to 2.8.0.0
Also bumps process and ghc-boot bounds on unix.
For hadrian, when cross-compiling, we add -Wwarn=unused-imports
-Wwarn=unused-top-binds to validation flavour. Further fixes in unix
and/or hsc2hs is needed to make it completely free of warnings; for
the time being, this change is needed to unblock other
cross-compilation related work.
- - - - -
42938a58 by Matthew Pickering at 2022-11-05T14:18:10+00:00
Bump Win32 submodule to 2.13.4.0
Fixes #22098
- - - - -
e7372bc5 by Cheng Shao at 2022-11-06T13:15:22+00:00
Bump ci-images revision
ci-images has recently been updated, including changes needed for wasm32-wasi CI.
- - - - -
88cb9492 by Cheng Shao at 2022-11-06T13:15:22+00:00
Bump gmp-tarballs submodule
Includes a fix for wasm support, doesn't impact other targets.
- - - - -
69427ce9 by Cheng Shao at 2022-11-06T13:15:22+00:00
Bump haskeline submodule
Includes a fix for wasm support, doesn't impact other targets.
- - - - -
5fe11fe6 by Carter Schonwald at 2022-11-07T13:22:14-05:00
bump llvm upper bound
- - - - -
68f49874 by M Farkas-Dyck at 2022-11-08T12:53:55-05:00
Define `Infinite` list and use where appropriate.
Also add perf test for infinite list fusion.
In particular, in `GHC.Core`, often we deal with infinite lists of roles. Also in a few locations we deal with infinite lists of names.
Thanks to simonpj for helping to write the Note [Fusion for `Infinite` lists].
- - - - -
ce726cd2 by Ross Paterson at 2022-11-08T12:54:34-05:00
Fix TypeData issues (fixes #22315 and #22332)
There were two bugs here:
1. Treating type-level constructors as PromotedDataCon doesn't always
work, in particular because constructors promoted via DataKinds are
called both T and 'T. (Tests T22332a, T22332b, T22315a, T22315b)
Fix: guard these cases with isDataKindsPromotedDataCon.
2. Type-level constructors were sent to the code generator, producing
things like constructor wrappers. (Tests T22332a, T22332b)
Fix: test for them in isDataTyCon.
Other changes:
* changed the marking of "type data" DataCon's as suggested by SPJ.
* added a test TDGADT for a type-level GADT.
* comment tweaks
* change tcIfaceTyCon to ignore IfaceTyConInfo, so that IfaceTyConInfo
is used only for pretty printing, not for typechecking. (SPJ)
- - - - -
132f8908 by Jade Lovelace at 2022-11-08T12:55:18-05:00
Clarify msum/asum documentation
- - - - -
bb5888c5 by Jade Lovelace at 2022-11-08T12:55:18-05:00
Add example for (<$)
- - - - -
080fffa1 by Jade Lovelace at 2022-11-08T12:55:18-05:00
Document what Alternative/MonadPlus instances actually do
- - - - -
92ccb8de by Giles Anderson at 2022-11-09T09:27:52-05:00
Use TcRnDiagnostic in GHC.Tc.TyCl.Instance (#20117)
The following `TcRnDiagnostic` messages have been introduced:
TcRnWarnUnsatisfiedMinimalDefinition
TcRnMisplacedInstSig
TcRnBadBootFamInstDeclErr
TcRnIllegalFamilyInstance
TcRnAssocInClassErr
TcRnBadFamInstDecl
TcRnNotOpenFamily
- - - - -
90c5abd4 by Hécate Moonlight at 2022-11-09T09:28:30-05:00
GHCi tags generation phase 2
see #19884
- - - - -
d8dec015 by Simon Peyton Jones at 2022-11-10T15:56:19+00:00
Kill ad hoc Note [Case MFEs] hack
See discussion in #19001. I'm keen to kill this hack off.
This MR is to check CI and perf.
Also enable CaseOfCase in InitialPhase
- - - - -
910 changed files:
- .editorconfig
- .gitignore
- .gitlab-ci.yml
- .gitlab/ci.sh
- CODEOWNERS
- README.md
- compiler/GHC.hs
- compiler/GHC/Builtin/Names.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/Cmm.hs
- compiler/GHC/Cmm/BlockId.hs
- compiler/GHC/Cmm/CLabel.hs
- compiler/GHC/Cmm/CLabel.hs-boot
- compiler/GHC/Cmm/ContFlowOpt.hs
- compiler/GHC/Cmm/Dataflow/Label.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/Info/Build.hs
- compiler/GHC/Cmm/Lint.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Node.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Pipeline.hs
- compiler/GHC/Cmm/Switch.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/AArch64/Regs.hs
- compiler/GHC/CmmToAsm/BlockLayout.hs
- compiler/GHC/CmmToAsm/Dwarf/Types.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/Instr.hs
- compiler/GHC/CmmToAsm/PPC/Ppr.hs
- compiler/GHC/CmmToAsm/PPC/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Liveness.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToAsm/X86/Ppr.hs
- compiler/GHC/CmmToAsm/X86/Regs.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm.hs
- compiler/GHC/CmmToLlvm/Base.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/DataCon.hs-boot
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/InstEnv.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Map/Expr.hs
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/CSE.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/CprAnal.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/Exitify.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Pipeline.hs
- compiler/GHC/Core/Opt/Pipeline/Types.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/Stats.hs
- compiler/GHC/Core/Opt/WorkWrap.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/Ppr.hs
- compiler/GHC/Core/Reduction.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/Tidy.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCo/Tidy.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unfold/Make.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/Bag.hs
- compiler/GHC/Data/Bool.hs
- compiler/GHC/Data/BooleanFormula.hs
- compiler/GHC/Data/FastMutInt.hs
- compiler/GHC/Data/FastString.hs
- + compiler/GHC/Data/List/Infinite.hs
- compiler/GHC/Data/List/SetOps.hs
- compiler/GHC/Data/OrdList.hs
- compiler/GHC/Data/TrieMap.hs
- + compiler/GHC/Data/Unboxed.hs
- compiler/GHC/Driver/Backpack.hs
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- libraries/Win32
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- libraries/base/Data/List.hs
- libraries/base/Data/OldList.hs
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- libraries/base/Foreign/C/String.hs
- libraries/base/Foreign/Marshal/Array.hs
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- libraries/base/GHC/Pack.hs
- libraries/base/GHC/Stack/CCS.hsc
- libraries/base/GHC/Stack/CloneStack.hs
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- libraries/base/GHC/Unicode.hs
- + libraries/base/GHC/Unicode/Internal/Char/DerivedCoreProperties.hs
- libraries/base/System/CPUTime/Posix/ClockGetTime.hsc
- libraries/base/aclocal.m4
- libraries/base/base.cabal
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- libraries/template-haskell/Language/Haskell/TH/Syntax.hs
- libraries/unix
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- rts/include/RtsAPI.h
- rts/include/Stg.h
- rts/include/rts/IPE.h
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[Git][ghc/ghc][wip/supersven/hadrian-cross-stage3] 6 commits: Word64Map: add compareSize
by Sven Tennie (＠supersven) 10 Aug '26
by Sven Tennie (＠supersven) 10 Aug '26
10 Aug '26
Sven Tennie pushed to branch wip/supersven/hadrian-cross-stage3 at Glasgow Haskell Compiler / GHC
Commits:
3a552476 by Simon Jakobi at 2026-08-09T15:20:06-04:00
Word64Map: add compareSize
compareSize m c compares the size of a map to an Int, but unlike
compare (size m) c it stops traversing the map once the outcome is
determined.
Based on https://github.com/haskell/containers/pull/1139
Assisted-by: Claude Opus 5
- - - - -
6e2c99d8 by Simon Jakobi at 2026-08-09T15:20:06-04:00
Use a pigeonhole sort for deterministic UniqDFM iteration
Deterministic UniqDFM iteration used a list mergesort, allocating O(n
log n) cons cells and contributing significantly to compiler allocations
(#27459).
Use a pigeonhole sort where appropriate, while retaining the mergesort
fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic
iteration].
The peak_megabytes_allocated increase for LinkableUsage02 is probably
due to GC timing noise. See #27613.
-------------------------
Metric Decrease:
InstanceMatching
InstanceMatching1
ManyAlternatives
T12707
T13379
T13719
T24471
T27336
T5321FD
T5321Fun
T783
Metric Increase 'peak_megabytes_allocated':
LinkableUsage02
-------------------------
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
a938ab12 by sheaf at 2026-08-09T15:20:48-04:00
Testsuite: don't measure max residency for T27336
We really care more about total allocations for this test, so this commit
removes the maximum residency measurement.
- - - - -
7d94bb78 by Alan Zimmerman at 2026-08-09T15:21:29-04:00
EPA: Remove LocatedE, replace with LocatedA
This gets rid of one more LocatedXXX occurrence
- - - - -
0ab99de9 by Sven Tennie at 2026-08-10T08:46:22+02:00
hadrian: Add Stage3 cross-compiled target bindist (#26924)
Add a `binary-dist-stage3` Hadrian target that packages target
executables (produced by the stage2 compiler) into a separate
'_build/bindist-stage3/' folder, distinct from the stage2 regular or
cross-compiler bindist in '_build/bindist/'.
This allows a single CI pipeline job to produce both a cross-compiler
bindist (e.g. x86_64 -> RISC-V) and a target-architecture bindist (e.g.
RISC-V -> RISC-V) that can be installed and run natively on the target.
To avoid issues with stale files or race-conditions on them, generate
the `configure` script per stage in `_build/<stage>/distrib`
directories.
- - - - -
5a88c2c1 by Sven Tennie at 2026-08-10T08:46:22+02:00
ci: Build Stage3 and Stage2 bindists for cross targets in one job (#26924)
Building the stage3 target bindist already produces most of the stage2
cross-compiler bindist as a byproduct, so building them in separate jobs
duplicates the build efforts for no benefit. Instead of a separate
CROSS_STAGE=3 job, the stage3 job now also builds and publishes the
stage2 bindist.
The stage3 tarball is named and versioned as if it were built natively
on the target (target triple prefix, non-cross opsys), so its artifact
name stays what downstream consumers already expect and no changes are
needed on their side.
For now, this is only enabled for the RISC-V job. Others can easily
follow.
- - - - -
39 changed files:
- .gitignore
- .gitlab/ci.sh
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- + changelog.d/stage3-cross-bindists
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Map/Lazy.hs
- compiler/GHC/Data/Word64Map/Strict.hs
- compiler/GHC/Data/Word64Map/Strict/Internal.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Unit/Module/Warnings.hs
- distrib/configure.ac.in
- hadrian/src/BindistConfig.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/Generate.hs
- testsuite/tests/ghc-api/exactprint/T22919.stderr
- testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr
- testsuite/tests/module/mod185.stderr
- testsuite/tests/parser/should_compile/DumpParsedAst.stderr
- testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr
- testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
- testsuite/tests/parser/should_compile/DumpSemis.stderr
- testsuite/tests/parser/should_compile/DumpTypecheckedAst.stderr
- testsuite/tests/parser/should_compile/KindSigs.stderr
- testsuite/tests/parser/should_compile/T20718.stderr
- testsuite/tests/parser/should_compile/T20846.stderr
- testsuite/tests/perf/compiler/all.T
- testsuite/tests/printer/Test20297.stdout
- testsuite/tests/printer/Test24533.stdout
- utils/check-exact/ExactPrint.hs
The diff was not included because it is too large.
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[Git][ghc/ghc] Pushed new branch wip/az/epa-tidy-locatedxxx-15
by Alan Zimmerman (＠alanz) 09 Aug '26
by Alan Zimmerman (＠alanz) 09 Aug '26
09 Aug '26
Alan Zimmerman pushed new branch wip/az/epa-tidy-locatedxxx-15 at Glasgow Haskell Compiler / GHC
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/az/epa-tidy-locatedxxx-15
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[Git][ghc/ghc][master] EPA: Remove LocatedE, replace with LocatedA
by Marge Bot (＠marge-bot) 09 Aug '26
by Marge Bot (＠marge-bot) 09 Aug '26
09 Aug '26
Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC
Commits:
7d94bb78 by Alan Zimmerman at 2026-08-09T15:21:29-04:00
EPA: Remove LocatedE, replace with LocatedA
This gets rid of one more LocatedXXX occurrence
- - - - -
24 changed files:
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Unit/Module/Warnings.hs
- testsuite/tests/ghc-api/exactprint/T22919.stderr
- testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr
- testsuite/tests/module/mod185.stderr
- testsuite/tests/parser/should_compile/DumpParsedAst.stderr
- testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr
- testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
- testsuite/tests/parser/should_compile/DumpSemis.stderr
- testsuite/tests/parser/should_compile/DumpTypecheckedAst.stderr
- testsuite/tests/parser/should_compile/KindSigs.stderr
- testsuite/tests/parser/should_compile/T20718.stderr
- testsuite/tests/parser/should_compile/T20846.stderr
- testsuite/tests/printer/Test20297.stdout
- testsuite/tests/printer/Test24533.stdout
- utils/check-exact/ExactPrint.hs
Changes:
=====================================
compiler/GHC/Hs/Decls.hs
=====================================
@@ -1354,10 +1354,10 @@ type instance XForeignExport GhcTc = Coercion
type instance XXForeignDecl (GhcPass _) = DataConCantHappen
-type instance XCImport (GhcPass _) = LocatedE SourceText -- original source text for the C entity
+type instance XCImport (GhcPass _) = LocatedA SourceText -- original source text for the C entity
type instance XXForeignImport (GhcPass _) = DataConCantHappen
-type instance XCExport (GhcPass _) = LocatedE SourceText -- original source text for the C entity
+type instance XCExport (GhcPass _) = LocatedA SourceText -- original source text for the C entity
type instance XXForeignExport (GhcPass _) = DataConCantHappen
@@ -1610,6 +1610,6 @@ type instance Anno (WarnDecl (GhcPass p)) = SrcSpanAnnA
type instance Anno (AnnDecl (GhcPass p)) = SrcSpanAnnA
type instance Anno (RoleAnnotDecl (GhcPass p)) = SrcSpanAnnA
type instance Anno (Maybe Role) = EpAnnCO
-type instance Anno CCallConv = EpaLocation
-type instance Anno Safety = EpaLocation
-type instance Anno CExportSpec = EpaLocation
+type instance Anno CCallConv = SrcSpanAnnA
+type instance Anno Safety = SrcSpanAnnA
+type instance Anno CExportSpec = SrcSpanAnnA
=====================================
compiler/GHC/Hs/Expr.hs
=====================================
@@ -2662,7 +2662,7 @@ type instance Anno [LocatedA (Match (GhcPass p) (LocatedA (HsExpr (GhcPass p))))
type instance Anno [LocatedA (Match (GhcPass p) (LocatedA (HsCmd (GhcPass p))))] = SrcSpanAnnA
type instance Anno (Match (GhcPass p) (LocatedA (HsExpr (GhcPass p)))) = SrcSpanAnnA
type instance Anno (Match (GhcPass p) (LocatedA (HsCmd (GhcPass p)))) = SrcSpanAnnA
-type instance Anno [LocatedA (Pat (GhcPass p))] = EpaLocation
+type instance Anno [LocatedA (Pat (GhcPass p))] = SrcSpanAnnA
type instance Anno (GRHS (GhcPass p) (LocatedA (HsExpr (GhcPass p)))) = EpAnnCO
type instance Anno (GRHS (GhcPass p) (LocatedA (HsCmd (GhcPass p)))) = EpAnnCO
type instance Anno (StmtLR (GhcPass pl) (GhcPass pr) (LocatedA (body (GhcPass pr)))) = SrcSpanAnnA
=====================================
compiler/GHC/Hs/Pat.hs
=====================================
@@ -353,7 +353,7 @@ hsRecFieldId = hsRecFieldSel
************************************************************************
-}
-instance (Outputable arg, Outputable (XRec p (HsRecField p arg)), XRec p RecFieldsDotDot ~ LocatedE RecFieldsDotDot)
+instance (Outputable arg, Outputable (XRec p (HsRecField p arg)), XRec p RecFieldsDotDot ~ LocatedA RecFieldsDotDot)
=> Outputable (HsRecFields p arg) where
ppr (HsRecFields { rec_flds = flds, rec_dotdot = Nothing })
= braces (fsep (punctuate comma (map ppr flds)))
@@ -1178,4 +1178,4 @@ type instance Anno (Pat (GhcPass p)) = SrcSpanAnnA
type instance Anno (HsOverLit (GhcPass p)) = EpAnnCO
type instance Anno ConLike = SrcSpanAnnN
type instance Anno (HsFieldBind lhs rhs) = SrcSpanAnnA
-type instance Anno RecFieldsDotDot = EpaLocation
+type instance Anno RecFieldsDotDot = SrcSpanAnnA
=====================================
compiler/GHC/Hs/Utils.hs
=====================================
@@ -179,7 +179,7 @@ mkSimpleMatch :: (Anno (Match (GhcPass p) (LocatedA (body (GhcPass p))))
Anno (GRHS (GhcPass p) (LocatedA (body (GhcPass p))))
~ EpAnn NoEpAnns)
=> HsMatchContext (LIdP (NoGhcTc (GhcPass p)))
- -> LocatedE [LPat (GhcPass p)] -> LocatedA (body (GhcPass p))
+ -> LocatedA [LPat (GhcPass p)] -> LocatedA (body (GhcPass p))
-> LMatch (GhcPass p) (LocatedA (body (GhcPass p)))
mkSimpleMatch ctxt (L l pats) rhs
= L loc $
@@ -264,7 +264,7 @@ mkHsAppTypes :: LHsExpr GhcRn -> [LHsWcType GhcRn] -> LHsExpr GhcRn
mkHsAppTypes = foldl' mkHsAppType
mkHsLam :: (IsPass p, XMG (GhcPass p) (LHsExpr (GhcPass p)) ~ (Origin, MatchGroupAnn))
- => LocatedE [LPat (GhcPass p)]
+ => LocatedA [LPat (GhcPass p)]
-> LHsExpr (GhcPass p)
-> LHsExpr (GhcPass p)
mkHsLam (L l pats) body = mkHsPar (L (getLoc body) (HsLam noAnn LamSingle matches))
@@ -904,7 +904,7 @@ get_bind_spans binds sigs
------------
-- | Convenience function using 'mkFunBind'.
-- This is for generated bindings only, do not use for user-written code.
-mkSimpleGeneratedFunBind :: SrcSpan -> RdrName -> LocatedE [LPat GhcPs]
+mkSimpleGeneratedFunBind :: SrcSpan -> RdrName -> LocatedA [LPat GhcPs]
-> LHsExpr GhcPs -> LHsBind GhcPs
mkSimpleGeneratedFunBind loc fun pats expr
= L (noAnnSrcSpan loc) $ mkFunBind (Generated OtherExpansion SkipPmc) (L (noAnnSrcSpan loc) fun)
@@ -923,7 +923,7 @@ mkPrefixFunRhs n an = FunRhs { mc_fun = n
------------
mkMatch :: forall p. IsPass p
=> HsMatchContext (LIdP (NoGhcTc (GhcPass p)))
- -> LocatedE [LPat (GhcPass p)]
+ -> LocatedA [LPat (GhcPass p)]
-> LHsExpr (GhcPass p)
-> HsLocalBinds (GhcPass p)
-> LMatch (GhcPass p) (LHsExpr (GhcPass p))
=====================================
compiler/GHC/Iface/Ext/Ast.hs
=====================================
@@ -2212,15 +2212,15 @@ instance ToHie (LocatedA (ForeignDecl GhcRn)) where
instance ToHie (ForeignImport GhcRn) where
toHie (CImport (L c _) (L a _) (L b _) _ _) = concatM $
- [ locOnlyE a
- , locOnlyE b
- , locOnlyE c
+ [ locOnlyE (entry a)
+ , locOnlyE (entry b)
+ , locOnlyE (entry c)
]
instance ToHie (ForeignExport GhcRn) where
toHie (CExport (L b _) (L a _)) = concatM $
- [ locOnlyE a
- , locOnlyE b
+ [ locOnlyE (entry a)
+ , locOnlyE (entry b)
]
instance ToHie (LocatedA (WarnDecls GhcRn)) where
=====================================
compiler/GHC/Parser.y
=====================================
@@ -2086,7 +2086,7 @@ maybe_warning_pragma :: { Maybe (LWarningTxt GhcPs) }
$2 (snd $ unLoc $3))}
| {- empty -} { Nothing }
-warning_category :: { Maybe (LocatedE (InWarningCategory GhcPs)) }
+warning_category :: { Maybe (LocatedA (InWarningCategory GhcPs)) }
: 'in' STRING { Just (reLoc $ sLL $1 $> $ InWarningCategory (epTok $1, getSTRINGs $2)
(reLoc $ sL1 $2 $ mkWarningCategory (getSTRING $2))) }
| {- empty -} { Nothing }
=====================================
compiler/GHC/Parser/Annotation.hs
=====================================
@@ -28,7 +28,7 @@ module GHC.Parser.Annotation (
-- ** Annotations in 'GenLocated'
LocatedA, LocatedN, LocatedAn,
- LocatedE, LocatedBF,
+ LocatedBF,
SrcSpanAnnA, SrcSpanAnnN,
SrcSpanAnnBF,
@@ -442,8 +442,6 @@ type SrcSpanAnnN = EpAnn NameAnn
type SrcSpanAnnBF = EpAnn AnnBooleanFormula
-type LocatedE = GenLocated EpaLocation
-
-- | General representation of a 'GenLocated' type carrying a
-- parameterised annotation type.
type LocatedAn an = GenLocated (EpAnn an)
@@ -840,8 +838,8 @@ widenSpanT :: SrcSpan -> EpToken tok -> SrcSpan
widenSpanT l (EpTok loc) = widenSpanL l [loc]
widenSpanT l NoEpTok = l
-listLocation :: [LocatedAn an a] -> EpaLocation
-listLocation as = EpaSpan (go noSrcSpan as)
+listLocation :: [LocatedAn an a] -> SrcSpanAnnA
+listLocation as = EpAnn (EpaSpan (go noSrcSpan as)) noAnn emptyComments
where
combine l r = combineSrcSpans l r
=====================================
compiler/GHC/Parser/PostProcess.hs
=====================================
@@ -1518,7 +1518,7 @@ checkFunBind :: SrcSpan
-> AnnFunRhs
-> LocatedN RdrName
-> LexicalFixity
- -> LocatedE [LocatedA (PatBuilder GhcPs)]
+ -> LocatedA [LocatedA (PatBuilder GhcPs)]
-> Located (GRHSs GhcPs (LHsExpr GhcPs))
-> P (HsBind GhcPs)
checkFunBind locF ann_fun (L lf fun) is_infix (L lp pats) (L _ grhss)
@@ -3214,7 +3214,7 @@ mkImport cconv safety (L loc sLit, v, ty) (timport, td) =
-- the string "foo" is ambiguous: either a header or a C identifier. The
-- C identifier case comes first in the alternatives below, so we pick
-- that one.
-parseCImport :: LocatedE CCallConv -> LocatedE Safety -> HText -> String
+parseCImport :: LocatedA CCallConv -> LocatedA Safety -> HText -> String
-> Located SourceText
-> Maybe (ForeignImport GhcPs)
parseCImport cconv safety nm str sourceText =
=====================================
compiler/GHC/Rename/Pat.hs
=====================================
@@ -859,7 +859,7 @@ rnHsRecFields ctxt mk_arg (HsRecFields { rec_flds = flds, rec_dotdot = dotdot })
, hfbRHS = arg'
, hfbPun = pun } }
- rn_dotdot :: Maybe (LocatedE RecFieldsDotDot) -- See Note [DotDot fields] in GHC.Hs.Pat
+ rn_dotdot :: Maybe (LocatedA RecFieldsDotDot) -- See Note [DotDot fields] in GHC.Hs.Pat
-> Maybe (WithUserRdr Name)
-- The constructor (Nothing for an out of scope constructor)
-> [LHsRecField GhcRn (LocatedA arg)] -- Explicit fields
=====================================
compiler/GHC/Unit/Module/Warnings.hs
=====================================
@@ -165,8 +165,8 @@ type instance XInWarningCategory (GhcPass _) = (EpToken "in", SourceText)
type instance XXInWarningCategory (GhcPass _) = DataConCantHappen
type instance Anno (WithHsDocIdentifiers (StringLiteral pass) pass) = SrcSpanAnnA
-type instance Anno (InWarningCategory (GhcPass pass)) = EpaLocation
-type instance Anno (WarningCategory) = EpaLocation
+type instance Anno (InWarningCategory (GhcPass pass)) = SrcSpanAnnA
+type instance Anno (WarningCategory) = SrcSpanAnnA
type instance Anno (WarningTxt (GhcPass pass)) = SrcSpanAnnA
deriving stock instance Eq (WarningTxt GhcPs)
=====================================
testsuite/tests/ghc-api/exactprint/T22919.stderr
=====================================
@@ -105,7 +105,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr
=====================================
@@ -117,7 +117,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/module/mod185.stderr
=====================================
@@ -129,7 +129,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/parser/should_compile/DumpParsedAst.stderr
=====================================
@@ -2157,7 +2157,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr
=====================================
@@ -125,7 +125,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -245,7 +249,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -391,7 +399,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
=====================================
@@ -65,7 +65,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/parser/should_compile/DumpSemis.stderr
=====================================
@@ -293,7 +293,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -583,7 +587,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -831,7 +839,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -1036,7 +1048,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -1138,7 +1154,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -1242,7 +1262,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -1730,7 +1754,11 @@
[]
[]))
(L
- (EpaSpan { DumpSemis.hs:32:3 })
+ (EpAnn
+ (EpaSpan { DumpSemis.hs:32:3 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { DumpSemis.hs:32:3 })
@@ -1853,7 +1881,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -1976,7 +2008,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -2086,7 +2122,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -2208,7 +2248,11 @@
[]
[]))
(L
- (EpaSpan { DumpSemis.hs:36:5 })
+ (EpAnn
+ (EpaSpan { DumpSemis.hs:36:5 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { DumpSemis.hs:36:5 })
@@ -2311,7 +2355,11 @@
(NoExtField)
(CaseAlt)
(L
- (EpaSpan { DumpSemis.hs:39:6 })
+ (EpAnn
+ (EpaSpan { DumpSemis.hs:39:6 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { DumpSemis.hs:39:6 })
@@ -2383,7 +2431,11 @@
(NoExtField)
(CaseAlt)
(L
- (EpaSpan { DumpSemis.hs:40:6 })
+ (EpAnn
+ (EpaSpan { DumpSemis.hs:40:6 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { DumpSemis.hs:40:6 })
@@ -2458,7 +2510,11 @@
(NoExtField)
(CaseAlt)
(L
- (EpaSpan { DumpSemis.hs:41:6 })
+ (EpAnn
+ (EpaSpan { DumpSemis.hs:41:6 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { DumpSemis.hs:41:6 })
@@ -2536,7 +2592,11 @@
(NoExtField)
(CaseAlt)
(L
- (EpaSpan { DumpSemis.hs:42:6 })
+ (EpAnn
+ (EpaSpan { DumpSemis.hs:42:6 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { DumpSemis.hs:42:6 })
=====================================
testsuite/tests/parser/should_compile/DumpTypecheckedAst.stderr
=====================================
@@ -1731,7 +1731,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/parser/should_compile/KindSigs.stderr
=====================================
@@ -998,7 +998,11 @@
[]
[]))
(L
- (EpaSpan { KindSigs.hs:23:5-7 })
+ (EpAnn
+ (EpaSpan { KindSigs.hs:23:5-7 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { KindSigs.hs:23:5 })
@@ -1694,7 +1698,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/parser/should_compile/T20718.stderr
=====================================
@@ -139,7 +139,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/parser/should_compile/T20846.stderr
=====================================
@@ -133,7 +133,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/printer/Test20297.stdout
=====================================
@@ -105,7 +105,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -233,7 +237,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -353,7 +361,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -539,7 +551,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -655,7 +671,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
@@ -769,7 +789,11 @@
[]
[]))
(L
- (EpaSpan { <no location info> })
+ (EpAnn
+ (EpaSpan { <no location info> })
+ []
+ (EpaComments
+ []))
[])
(GRHSs
(EpaComments
=====================================
testsuite/tests/printer/Test24533.stdout
=====================================
@@ -555,7 +555,11 @@
[]
[]))
(L
- (EpaSpan { Test24533.hs:16:3-12 })
+ (EpAnn
+ (EpaSpan { Test24533.hs:16:3-12 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { Test24533.hs:16:3-5 })
@@ -1124,7 +1128,11 @@
[]
[]))
(L
- (EpaSpan { Test24533.ppr.hs:6:3-12 })
+ (EpAnn
+ (EpaSpan { Test24533.ppr.hs:6:3-12 })
+ []
+ (EpaComments
+ []))
[(L
(EpAnn
(EpaSpan { Test24533.ppr.hs:6:3-5 })
=====================================
utils/check-exact/ExactPrint.hs
=====================================
@@ -723,6 +723,11 @@ printStringAtMLocL an l s = do
printStringAdvanceA :: (Monad m, Monoid w) => String -> EP w m ()
printStringAdvanceA str = printStringAtAA (EpaDelta noSrcSpan (SameLine 0) []) str >> return ()
+printStringAtA :: (Monad m, Monoid w) => EpAnn a -> String -> EP w m (EpAnn a)
+printStringAtA ann s = do
+ l' <- printStringAtAA (entry ann) s
+ return ann { entry = l' }
+
printStringAtAA :: (Monad m, Monoid w) => EpaLocation -> String -> EP w m EpaLocation
printStringAtAA el str = printStringAtAAC CaptureComments el str
@@ -747,9 +752,13 @@ printStringAtAAC capture (EpaDelta ss d cs) s = do
-- ---------------------------------------------------------------------
-markExternalSourceTextE :: (Monad m, Monoid w) => EpaLocation -> SourceText -> String -> EP w m EpaLocation
-markExternalSourceTextE l NoSourceText txt = printStringAtAA l txt
-markExternalSourceTextE l (SourceText txt) _ = printStringAtAA l (unpackFS txt)
+markExternalSourceTextA :: (Monad m, Monoid w) => EpAnn a -> SourceText -> String -> EP w m (EpAnn a)
+markExternalSourceTextA ann src txt = do
+ l' <- mark_source_text ann src txt
+ return (ann { entry = l'})
+ where
+ mark_source_text l NoSourceText txt' = printStringAtAA (entry l) txt'
+ mark_source_text l (SourceText txt') _ = printStringAtAA (entry l) (unpackFS txt')
-- ---------------------------------------------------------------------
@@ -1415,15 +1424,6 @@ instance (ExactPrint a) => ExactPrint (Located a) where
exact (L l a) = L l <$> markAnnotated a
-instance (ExactPrint a) => ExactPrint (LocatedE a) where
- getAnnotationEntry (L l _) = Entry l [] emptyComments NoFlushComments CanUpdateAnchorOnly
- setAnnotationAnchor (L _ a) anc _ts _cs = L anc a
-
- exact (L la a) = do
- debugM $ "LocatedE a:la loc=" ++ show (ss2range $ locA la)
- a' <- markAnnotated a
- return (L la a')
-
instance (ExactPrint a) => ExactPrint (LocatedA a) where
getAnnotationEntry = entryFromLocatedA
setAnnotationAnchor la anc ts cs = setAnchorAn la anc ts cs
@@ -1865,11 +1865,11 @@ instance ExactPrint (ForeignImport GhcPs) where
setAnnotationAnchor a _ _ _ = a
exact (CImport (L ls src) cconv safety@(L l _) mh imp) = do
cconv' <- markAnnotated cconv
- safety' <- if notDodgyE l
+ safety' <- if notDodgyE (entry l)
then markAnnotated safety
else return safety
- ls' <- if notDodgyE ls
- then markExternalSourceTextE ls src ""
+ ls' <- if notDodgyE (entry ls)
+ then markExternalSourceTextA ls src ""
else return ls
return (CImport (L ls' src) cconv' safety' mh imp)
@@ -1881,8 +1881,8 @@ instance ExactPrint (ForeignExport GhcPs) where
exact (CExport (L ls src) spec) = do
debugM $ "CExport starting"
spec' <- markAnnotated spec
- ls' <- if notDodgyE ls
- then markExternalSourceTextE ls src ""
+ ls' <- if notDodgyE (entry ls)
+ then markExternalSourceTextA ls src ""
else return ls
return (CExport (L ls' src) spec')
@@ -3212,7 +3212,7 @@ instance (ExactPrint body) => ExactPrint (HsRecFields GhcPs body) where
mdot' <- case mdot of
Nothing -> return Nothing
Just (L ss d) -> do
- ss' <- printStringAtAA ss ".."
+ ss' <- printStringAtA ss ".."
return $ Just (L ss' d)
-- Note: mdot contains the SrcSpan where the ".." appears, if present
cc' <- markEpToken cc
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/7d94bb78dc06ea7d6d70f3488a9f72b…
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/7d94bb78dc06ea7d6d70f3488a9f72b…
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[Git][ghc/ghc][master] Testsuite: don't measure max residency for T27336
by Marge Bot (＠marge-bot) 09 Aug '26
by Marge Bot (＠marge-bot) 09 Aug '26
09 Aug '26
Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC
Commits:
a938ab12 by sheaf at 2026-08-09T15:20:48-04:00
Testsuite: don't measure max residency for T27336
We really care more about total allocations for this test, so this commit
removes the maximum residency measurement.
- - - - -
1 changed file:
- testsuite/tests/perf/compiler/all.T
Changes:
=====================================
testsuite/tests/perf/compiler/all.T
=====================================
@@ -200,7 +200,6 @@ test('FamAppCachePerf',
test('T27336',
[ only_ways(['normal'])
- , collect_compiler_residency(20)
, collect_compiler_stats('bytes allocated',2)
],
compile,
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/a938ab120e85e62b2e784c376f81570…
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/a938ab120e85e62b2e784c376f81570…
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09 Aug '26
Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC
Commits:
3a552476 by Simon Jakobi at 2026-08-09T15:20:06-04:00
Word64Map: add compareSize
compareSize m c compares the size of a map to an Int, but unlike
compare (size m) c it stops traversing the map once the outcome is
determined.
Based on https://github.com/haskell/containers/pull/1139
Assisted-by: Claude Opus 5
- - - - -
6e2c99d8 by Simon Jakobi at 2026-08-09T15:20:06-04:00
Use a pigeonhole sort for deterministic UniqDFM iteration
Deterministic UniqDFM iteration used a list mergesort, allocating O(n
log n) cons cells and contributing significantly to compiler allocations
(#27459).
Use a pigeonhole sort where appropriate, while retaining the mergesort
fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic
iteration].
The peak_megabytes_allocated increase for LinkableUsage02 is probably
due to GC timing noise. See #27613.
-------------------------
Metric Decrease:
InstanceMatching
InstanceMatching1
ManyAlternatives
T12707
T13379
T13719
T24471
T27336
T5321FD
T5321Fun
T783
Metric Increase 'peak_megabytes_allocated':
LinkableUsage02
-------------------------
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
5 changed files:
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Map/Lazy.hs
- compiler/GHC/Data/Word64Map/Strict.hs
- compiler/GHC/Data/Word64Map/Strict/Internal.hs
- compiler/GHC/Types/Unique/DFM.hs
Changes:
=====================================
compiler/GHC/Data/Word64Map/Internal.hs
=====================================
@@ -72,6 +72,7 @@ module GHC.Data.Word64Map.Internal (
-- * Query
, null
, size
+ , compareSize
, member
, notMember
, lookup
@@ -169,6 +170,7 @@ module GHC.Data.Word64Map.Internal (
, map
, mapWithKey
, traverseWithKey
+ , traverseWithKey_
, traverseMaybeWithKey
, mapAccum
, mapAccumWithKey
@@ -522,6 +524,8 @@ null _ = False
-- > size empty == 0
-- > size (singleton 1 'a') == 1
-- > size (fromList([(1,'a'), (2,'c'), (3,'b')])) == 3
+--
+-- See also: 'compareSize'
size :: Word64Map a -> Int
size = go 0
where
@@ -529,6 +533,23 @@ size = go 0
go acc (Tip _ _) = 1 + acc
go acc Nil = acc
+-- | \(O(\min(n,c))\). Compare the number of entries in the map to an @Int@.
+--
+-- @compareSize m c@ returns the same result as @compare ('size' m) c@ but is
+-- more efficient when @c@ is smaller than the size of the map.
+compareSize :: Word64Map a -> Int -> Ordering
+compareSize Nil c0 = compare 0 c0
+compareSize _ c0 | c0 <= 0 = GT
+compareSize t c0 = compare 0 (go t (c0 - 1))
+ where
+ go (Bin _ _ _ _) 0 = -1
+ go (Bin _ _ l r) c
+ | c' < 0 = c'
+ | otherwise = go r c'
+ where
+ c' = go l (c - 1)
+ go _ c = c -- Must be Tip (Nil is never a child of Bin)
+
-- | \(O(\min(n,W))\). Is the key a member of the map?
--
-- > member 5 (fromList [(5,'a'), (3,'b')]) == True
@@ -2500,6 +2521,16 @@ traverseWithKey f = go
| otherwise = liftA2 (Bin p m) (go l) (go r)
{-# INLINE traverseWithKey #-}
+-- | \(O(n)\). Visit each key\/value pair in ascending key order, discarding
+-- the results.
+traverseWithKey_ :: Applicative t => (Key -> a -> t ()) -> Word64Map a -> t ()
+traverseWithKey_ f = go
+ where
+ go Nil = pure ()
+ go (Tip k v) = f k v
+ go (Bin _ _ l r) = go l *> go r
+{-# INLINE traverseWithKey_ #-}
+
-- | \(O(n)\). The function @'mapAccum'@ threads an accumulating
-- argument through the map in ascending order of keys.
--
=====================================
compiler/GHC/Data/Word64Map/Lazy.hs
=====================================
@@ -113,6 +113,7 @@ module GHC.Data.Word64Map.Lazy (
-- ** Size
, WM.null
, size
+ , compareSize
-- * Combine
@@ -148,6 +149,7 @@ module GHC.Data.Word64Map.Lazy (
, WM.map
, mapWithKey
, traverseWithKey
+ , traverseWithKey_
, traverseMaybeWithKey
, mapAccum
, mapAccumWithKey
=====================================
compiler/GHC/Data/Word64Map/Strict.hs
=====================================
@@ -130,6 +130,7 @@ module GHC.Data.Word64Map.Strict (
-- ** Size
, null
, size
+ , compareSize
-- * Combine
@@ -165,6 +166,7 @@ module GHC.Data.Word64Map.Strict (
, map
, mapWithKey
, traverseWithKey
+ , traverseWithKey_
, traverseMaybeWithKey
, mapAccum
, mapAccumWithKey
=====================================
compiler/GHC/Data/Word64Map/Strict/Internal.hs
=====================================
@@ -132,6 +132,7 @@ module GHC.Data.Word64Map.Strict.Internal (
-- ** Size
, null
, size
+ , compareSize
-- * Combine
@@ -167,6 +168,7 @@ module GHC.Data.Word64Map.Strict.Internal (
, map
, mapWithKey
, traverseWithKey
+ , traverseWithKey_
, traverseMaybeWithKey
, mapAccum
, mapAccumWithKey
@@ -322,12 +324,14 @@ import GHC.Data.Word64Map.Internal
, spanAntitone
, restrictKeys
, size
+ , compareSize
, split
, splitLookup
, splitRoot
, toAscList
, toDescList
, toList
+ , traverseWithKey_
, union
, unions
, withoutKeys
=====================================
compiler/GHC/Types/Unique/DFM.hs
=====================================
@@ -14,6 +14,9 @@ See Note [Unique Determinism] in GHC.Types.Unique for explanation why @Unique@ o
is not deterministic.
-}
+{-# LANGUAGE MagicHash #-}
+{-# LANGUAGE UnboxedTuples #-}
+
{-# OPTIONS_GHC -Wall #-}
module GHC.Types.Unique.DFM (
@@ -79,6 +82,9 @@ import Data.Functor.Classes (Eq1 (..))
import Data.List (sortBy)
import Data.Function (on)
import GHC.Types.Unique.FM (UniqFM, nonDetUFMToList, ufmToIntMap, unsafeIntMapToUFM)
+import GHC.Data.SmallArray
+import GHC.Exts (State#, build)
+import GHC.ST (ST(..), runST)
import Unsafe.Coerce
import qualified GHC.Data.Word64Set as W
@@ -96,10 +102,10 @@ import qualified GHC.Data.Word64Set as W
-- This means `alterUDFM` consistent with `addToUDFM` and `adjustUDFM`,
-- so that for example `alterUDFM id k = id` and `alterUDFM (fmap f) k = adjustUDFM f k`
--
--- There is an implementation cost: each element is given a serial number
--- as it is added, and `udfmToList` sorts its result by this serial
--- number. So you should only use `UniqDFM` if you need the deterministic
--- property.
+-- There is an implementation cost: each element is given an insertion tag
+-- as it is added, and functions like `udfmToList` or `eltsUDFM` order their
+-- results by this tag (see Note [Cost of deterministic iteration]). So you
+-- should only use `UniqDFM` if you need the deterministic property.
--
-- `foldUDFM` also preserves determinism.
--
@@ -112,7 +118,7 @@ import qualified GHC.Data.Word64Set as W
--
--
-- There's more than one way to implement this. The implementation here tags
--- every value with the insertion time that can later be used to sort the
+-- every value with its insertion tag that can later be used to sort the
-- values when asked to convert to a list.
--
-- Updating an existing key keeps the old tag. This keeps the order stable for
@@ -125,7 +131,7 @@ import qualified GHC.Data.Word64Set as W
--
-- An alternative would be to have
--
--- data UniqDFM ele = UDFM (M.IntMap ele) [ele]
+-- data UniqDFM ele = UDFM (Word64Map ele) [ele]
--
-- where the list determines the order. This makes deletion tricky as we'd
-- only accumulate elements in that list, but makes merging easier as you
@@ -133,11 +139,11 @@ import qualified GHC.Data.Word64Set as W
-- Deletion can probably be done in amortized fashion when the size of the
-- list is twice the size of the set.
--- | A type of values tagged with insertion time
+-- | A type of values carrying an insertion tag
data TaggedVal val =
TaggedVal
!val
- {-# UNPACK #-} !Int -- ^ insertion time
+ {-# UNPACK #-} !Int -- ^ insertion tag
deriving stock (Data, Functor, Foldable, Traversable)
taggedFst :: TaggedVal val -> val
@@ -159,18 +165,30 @@ instance Eq val => Eq (TaggedVal val) where
data UniqDFM key ele =
UDFM
!(M.Word64Map (TaggedVal ele)) -- A map where keys are Unique's values and
- -- values are tagged with insertion time.
- -- The invariant is that all the tags will
- -- be distinct within a single map
- {-# UNPACK #-} !Int -- Upper bound on the values' insertion
- -- time. See Note [Overflow on plusUDFM]
+ -- values carry an insertion tag.
+ {-# UNPACK #-} !Int -- Upper bound on the values' insertion
+ -- tags. See Note [Overflow on plusUDFM]
+ -- See Note [UDFM invariants]
deriving (Data, Functor)
--- | Deterministic, in O(n log n).
+{- Note [UDFM invariants]
+~~~~~~~~~~~~~~~~~~~~~~~~~
+In a map (UDFM m ub):
+
+ (a) The insertion tags of the elements of m are distinct.
+ (b) Every tag lies in [0, ub).
+
+Consequently ub >= size m.
+
+The tags determine the order of deterministic iteration (eltsUDFM,
+udfmToList). See Note [Sorting a UDFM].
+-}
+
+-- | Deterministic. See Note [Cost of deterministic iteration].
instance Foldable (UniqDFM key) where
foldr = foldUDFM
--- | Deterministic, in O(n log n).
+-- | Deterministic. See Note [Cost of deterministic iteration].
instance Traversable (UniqDFM key) where
traverse f = fmap listToUDFM_Directly
. traverse (\(u,a) -> (u,) <$> f a)
@@ -264,8 +282,8 @@ plusUDFM_CK f udfml@(UDFM _ i) udfmr@(UDFM _ j)
-- Note [Overflow on plusUDFM]
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- There are multiple ways of implementing plusUDFM.
--- The main problem that needs to be solved is overlap on times of
--- insertion between different keys in two maps.
+-- The main problem that needs to be solved is overlap on insertion
+-- tags between different keys in two maps.
-- Consider:
--
-- A = fromList [(a, (x, 1))]
@@ -325,13 +343,27 @@ elemUDFM :: Uniquable key => key -> UniqDFM key elt -> Bool
elemUDFM k (UDFM m _i) = M.member (getKey $ getUnique k) m
-- | Performs a deterministic fold over the UniqDFM.
--- It's O(n log n) while the corresponding function on `UniqFM` is O(n).
+--
+-- O(n) in the common case, with an O(n log n) fallback.
+--
+-- See Note [Cost of deterministic iteration].
foldUDFM :: (elt -> a -> a) -> a -> UniqDFM key elt -> a
{-# INLINE foldUDFM #-}
--- This INLINE prevents a regression in !10568
-foldUDFM k z m = foldr k z (eltsUDFM m)
-
--- | Like 'foldUDFM' but the function also receives a key
+-- Specialises k and z into M.foldr on the small-map path.
+foldUDFM k z (UDFM m ub)
+ | M.compareSize m 1 /= GT = M.foldr (k . taggedFst) z m
+ | otherwise = fold_udfm k z m ub
+
+fold_udfm :: (elt -> a -> a) -> a -> M.Word64Map (TaggedVal elt) -> Int -> a
+{-# NOINLINE fold_udfm #-}
+-- Kept out of line so that foldUDFM's consumers don't inline the sort machinery.
+fold_udfm k z m ub
+ | usePigeonholeSort m ub = foldr k z (pigeonholeSort ub (\_ tv -> tv) m)
+ | otherwise = foldr k z (map taggedFst (sort_it m))
+
+-- | Like 'foldUDFM' but the function also receives a key.
+--
+-- See Note [Cost of deterministic iteration].
foldWithKeyUDFM :: (Unique -> elt -> a -> a) -> a -> UniqDFM key elt -> a
{-# INLINE foldWithKeyUDFM #-}
-- This INLINE was copied from foldUDFM
@@ -346,14 +378,113 @@ nonDetStrictFoldUDFM k z (UDFM m _i) = foldl' k' z m
where
k' acc (TaggedVal v _) = k v acc
+{- Note [Cost of deterministic iteration]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Deterministic iteration -- foldUDFM, eltsUDFM, udfmToList, and everything
+built on them -- orders elements by insertion tag. The element with the
+smallest tag can sit anywhere in the map, so every tag must be inspected,
+and, given a @UDFM m ub@ on the pigeonhole-sort path, an array with ub slots
+must be filled, before the first element can be emitted (see
+Note [Sorting a UDFM]). So beyond maps of a single element, deterministic
+iteration cannot stream: demanding any of the result processes the whole
+map. #27459 shows that cost hitting a consumer that only needed to know
+whether the result was non-empty.
+
+So: to test for emptiness, use isNullUDFM rather than null on eltsUDFM;
+for order-oblivious queries, prefer short-circuiting anyUDFM/allUDFM; and
+if you don't need the deterministic order at all, use nonDetStrictFoldUDFM.
+-}
+
+-- | Deterministic, in order of insertion.
+--
+-- See Note [Sorting a UDFM] and Note [Cost of deterministic iteration].
eltsUDFM :: UniqDFM key elt -> [elt]
-{-# INLINE eltsUDFM #-}
--- The INLINE makes it a good producer (from the map)
-eltsUDFM (UDFM m _i) = map taggedFst (sort_it m)
+{-# INLINE eltsUDFM #-} -- so the small case is a good producer
+ -- This matters for T13719.
+eltsUDFM (UDFM m ub)
+ | M.compareSize m 1 /= GT = build (\c n -> M.foldr (c . taggedFst) n m)
+ | otherwise = elts_udfm m ub
+
+elts_udfm :: M.Word64Map (TaggedVal elt) -> Int -> [elt]
+{-# NOINLINE elts_udfm #-}
+-- Kept out of line so that eltsUDFM's consumers don't inline the sort machinery.
+elts_udfm m ub
+ | usePigeonholeSort m ub = pigeonholeSort ub (\_ tv -> tv) m
+ | otherwise = map taggedFst (sort_it m)
sort_it :: M.Word64Map (TaggedVal elt) -> [TaggedVal elt]
sort_it m = sortBy (compare `on` taggedSnd) (M.elems m)
+
+{- Note [Sorting a UDFM]
+~~~~~~~~~~~~~~~~~~~~~~~~
+Deterministic iteration must yield a map's elements in order of their
+insertion tags. The obvious way is to sort on the tags, but we can do better:
+in (UDFM m ub) the tags are distinct indices into [0, ub) (see
+Note [UDFM invariants]), so each element can simply be placed at its own
+tag in an ub-slot array, which is then read back in index order. This is
+pigeonhole sort, with one element per hole.
+
+Cost: writing the elements is O(n) for n = M.size m, while allocating the
+array and reading it back are O(ub). Since n <= ub the total is O(ub). No
+comparisons are made.
+
+So the method wins only while the array stays dense, and ub never shrinks
+(overwrites keep bumping it, delete/filter shrink n but not ub).
+usePigeonholeSort therefore takes this path only when ub <= 4 * n, which
+bounds its cost at O(n), and falls back to the O(n log n) comparison sort
+otherwise.
+
+Unfilled slots contain a TaggedVal with tag -1 and value
+@unsafeCoerce () :: r@. This is safe because the value is never used: only
+slots with non-negative tags are read.
+
+pigeonholeSort also avoids intermediate lists: it fills the array by
+traversing the map directly, and emits its readout with 'build', so the foldr
+in fold_udfm fuses with it. This contributes significantly to the allocation
+reductions in InstanceMatching1 in !16292.
+-}
+
+-- | @ub <= 4 * size m@, computed without a full 'M.size' traversal.
+usePigeonholeSort :: M.Word64Map a -> Int -> Bool
+usePigeonholeSort m ub = M.compareSize m ceil_ub_div_4 /= LT
+ where
+ ceil_ub_div_4 = (ub + 3) `div` 4 -- ceil(ub/4): ub <= 4*n iff n >= ceil(ub/4)
+
+-- | Order the map's elements by tag. The tags must be distinct and in
+-- @[0, ub)@, and @mk@ must preserve them. See Note [Sorting a UDFM].
+pigeonholeSort :: forall e r. Int
+ -> (M.Key -> TaggedVal e -> TaggedVal r)
+ -> M.Word64Map (TaggedVal e)
+ -> [r]
+{-# INLINE pigeonholeSort #-} -- Specialise mk and enable foldr/build fusion.
+pigeonholeSort ub mk m = build gen
+ where
+ -- The tag -1 marks unfilled slots; the value field is never read, but it
+ -- is strict, so it needs a WHNF value of type r. See Note [Sorting a UDFM].
+ hole :: TaggedVal r
+ hole = TaggedVal (unsafeCoerce ()) (-1)
+
+ fill :: SmallMutableArray s (TaggedVal r) -> State# s -> (# State# s, () #)
+ fill marr s = case M.traverseWithKey_ write m of ST st -> st s
+ where
+ write k tv = ST (\s' ->
+ (# writeSmallArray marr (taggedSnd tv) (mk k tv) s', () #))
+
+ gen :: forall b. (r -> b -> b) -> b -> b
+ gen cons nil = runST (ST (\s0 ->
+ case newSmallArray ub hole s0 of
+ (# s1, marr #) -> case fill marr s1 of
+ (# s2, () #) -> case unsafeFreezeSmallArray marr s2 of
+ (# s3, arr #) -> (# s3, readout arr 0 #)))
+ where
+ readout :: SmallArray (TaggedVal r) -> Int -> b
+ readout arr j
+ | j >= ub = nil
+ | t < 0 = readout arr (j + 1)
+ | otherwise = cons v (readout arr (j + 1))
+ where TaggedVal v t = indexSmallArray arr j
+
filterUDFM :: (elt -> Bool) -> UniqDFM key elt -> UniqDFM key elt
filterUDFM p (UDFM m i) = UDFM (M.filter (\(TaggedVal v _) -> p v) m) i
@@ -371,11 +502,22 @@ udfmRestrictKeysSet (UDFM val_set i) set =
in UDFM (M.restrictKeys val_set key_set) i
-- | Converts `UniqDFM` to a list, with elements in deterministic order.
--- It's O(n log n) while the corresponding function on `UniqFM` is O(n).
+--
+-- O(n) in the common case, with an O(n log n) fallback.
+--
+-- See Note [Cost of deterministic iteration].
udfmToList :: UniqDFM key elt -> [(Unique, elt)]
-udfmToList (UDFM m _i) =
- [ (mkUniqueGrimily k, taggedFst v)
- | (k, v) <- sortBy (compare `on` (taggedSnd . snd)) $ M.toList m ]
+-- NB: no INLINE, unlike eltsUDFM. udfmToList's one hot consumer is
+-- traverseUSDFM in the pattern-match checker, which doesn't fuse. Inlining
+-- the size dispatch into it regresses T17836.
+udfmToList (UDFM m ub)
+ | M.compareSize m 1 /= GT =
+ M.foldrWithKey (\k tv r -> (mkUniqueGrimily k, taggedFst tv) : r) [] m
+ | usePigeonholeSort m ub = pigeonholeSort ub
+ (\k tv -> TaggedVal (mkUniqueGrimily k, taggedFst tv) (taggedSnd tv)) m
+ | otherwise =
+ [ (mkUniqueGrimily k, taggedFst v)
+ | (k, v) <- sortBy (compare `on` (taggedSnd . snd)) $ M.toList m ]
-- Determines whether two 'UniqDFM's contain the same keys.
equalKeysUDFM :: UniqDFM key a -> UniqDFM key b -> Bool
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/eb1dcd4d98548b7bc64c323dc352dd…
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/eb1dcd4d98548b7bc64c323dc352dd…
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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 6 commits: Discard type arguments in tcPatToExpr (#27440, #27583)
by Marge Bot (＠marge-bot) 09 Aug '26
by Marge Bot (＠marge-bot) 09 Aug '26
09 Aug '26
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
4f985108 by Vladislav Zavialov at 2026-08-07T17:49:50-04:00
Discard type arguments in tcPatToExpr (#27440, #27583)
The builder expression of an implicitly bidirectional pattern synonym must not
mention types written in the RHS:
* Invisible type arguments led to a panic (#27440)
* Required type arguments failed with out-of-scope variables (#27583)
Both are now discarded, following the precedent established by pattern
signatures (#9867).
Discarding type arguments takes some care: a type pattern cannot be told from a
value pattern by syntax alone, as the `type` keyword may be omitted. Consider:
data T a b c where
MkT :: forall a. forall b c -> a -> T a b c
pattern P :: x -> T x y z
pattern P x = MkT @a (type b) c x
In P's right-hand side, `@a` and `type b` are clearly type arguments, but what
about `c` and `x`? We can only tell by matching the patterns against MkT's
type. So tcPatToExpr now runs in TcM and matches the arguments against the
constructor's TyVarBinders using zipPatsBndrs, which is made public for this
purpose. The resulting builder is $bP x = MkT _ _ x.
See Note [Discarding types in the builder expression].
Test cases: T27440a T27440b T27440c T27440d T27440e
T27583a T27583b T27583c T27583d T27583e T27583f T27583g
Metric Increase: LinkableUsage02
Metric Decrease: T27336
Assisted-by: Claude Opus 5
- - - - -
eb1dcd4d by sheaf at 2026-08-07T17:50:40-04:00
mkWpFun_FRR: fix ordering of coercion composition
When the subsumption machinery generates an eta-expansion, we must
perform a representation polymorphism check to ensure the lambda binder
it introduces has a fixed runtime representation.
This is done in GHC.Tc.Utils.mkWpFun_FRR.
This check involves composing quite a few coercions, arising from
representation-polymorphism checks on both the actual and expected
argument types. These coercions are then chained using HsWrapper
composition, <.>. The ordering of composition was incorrect, leading to
the Core Lint failure reported in #27639. This commit fixes that.
Fixes #27639
- - - - -
98d0f540 by Simon Jakobi at 2026-08-09T11:09:47-04:00
Word64Map: add compareSize
compareSize m c compares the size of a map to an Int, but unlike
compare (size m) c it stops traversing the map once the outcome is
determined.
Based on https://github.com/haskell/containers/pull/1139
Assisted-by: Claude Opus 5
- - - - -
15080c42 by Simon Jakobi at 2026-08-09T11:09:47-04:00
Use a pigeonhole sort for deterministic UniqDFM iteration
Deterministic UniqDFM iteration used a list mergesort, allocating O(n
log n) cons cells and contributing significantly to compiler allocations
(#27459).
Use a pigeonhole sort where appropriate, while retaining the mergesort
fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic
iteration].
The peak_megabytes_allocated increase for LinkableUsage02 is probably
due to GC timing noise. See #27613.
-------------------------
Metric Decrease:
InstanceMatching
InstanceMatching1
ManyAlternatives
T12707
T13379
T13719
T24471
T27336
T5321FD
T5321Fun
T783
Metric Increase 'peak_megabytes_allocated':
LinkableUsage02
-------------------------
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
16326d09 by sheaf at 2026-08-09T11:09:48-04:00
Testsuite: don't measure max residency for T27336
We really care more about total allocations for this test, so this commit
removes the maximum residency measurement.
- - - - -
a2dcad43 by Alan Zimmerman at 2026-08-09T11:09:49-04:00
EPA: Remove LocatedE, replace with LocatedA
This gets rid of one more LocatedXXX occurrence
- - - - -
57 changed files:
- + changelog.d/T27440
- + changelog.d/T27583
- + changelog.d/T27639
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Map/Lazy.hs
- compiler/GHC/Data/Word64Map/Strict.hs
- compiler/GHC/Data/Word64Map/Strict/Internal.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Unit/Module/Warnings.hs
- testsuite/tests/ghc-api/exactprint/T22919.stderr
- testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr
- testsuite/tests/module/mod185.stderr
- testsuite/tests/parser/should_compile/DumpParsedAst.stderr
- testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr
- testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
- testsuite/tests/parser/should_compile/DumpSemis.stderr
- testsuite/tests/parser/should_compile/DumpTypecheckedAst.stderr
- testsuite/tests/parser/should_compile/KindSigs.stderr
- testsuite/tests/parser/should_compile/T20718.stderr
- testsuite/tests/parser/should_compile/T20846.stderr
- + testsuite/tests/patsyn/should_compile/T27440a.hs
- + testsuite/tests/patsyn/should_compile/T27440b.hs
- + testsuite/tests/patsyn/should_compile/T27440c.hs
- testsuite/tests/patsyn/should_compile/all.T
- + testsuite/tests/patsyn/should_fail/T27440d.hs
- + testsuite/tests/patsyn/should_fail/T27440d.stderr
- testsuite/tests/patsyn/should_fail/all.T
- testsuite/tests/perf/compiler/all.T
- testsuite/tests/printer/Test20297.stdout
- testsuite/tests/printer/Test24533.stdout
- + testsuite/tests/rep-poly/T27639.hs
- testsuite/tests/rep-poly/all.T
- + testsuite/tests/vdq-rta/should_compile/T27583a.hs
- + testsuite/tests/vdq-rta/should_compile/T27583b.hs
- + testsuite/tests/vdq-rta/should_compile/T27583c.hs
- + testsuite/tests/vdq-rta/should_compile/T27583d.hs
- + testsuite/tests/vdq-rta/should_compile/T27583e.hs
- + testsuite/tests/vdq-rta/should_compile/T27583g.hs
- testsuite/tests/vdq-rta/should_compile/all.T
- + testsuite/tests/vdq-rta/should_fail/T27440e.hs
- + testsuite/tests/vdq-rta/should_fail/T27440e.stderr
- + testsuite/tests/vdq-rta/should_fail/T27583f.hs
- + testsuite/tests/vdq-rta/should_fail/T27583f.stderr
- testsuite/tests/vdq-rta/should_fail/all.T
- utils/check-exact/ExactPrint.hs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9787e836ab725c82a070f6cc4786d3…
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[Git][ghc/ghc][wip/az/ghc-cpp] 826 commits: hadrian: drops unused PE linker script for windows
by Alan Zimmerman (＠alanz) 09 Aug '26
by Alan Zimmerman (＠alanz) 09 Aug '26
09 Aug '26
Alan Zimmerman pushed to branch wip/az/ghc-cpp at Glasgow Haskell Compiler / GHC
Commits:
a8a94aad by Cheng Shao at 2026-01-05T16:24:04-05:00
hadrian: drops unused PE linker script for windows
This patch drops unused PE linker script for windows in the
`MergeObjects` builder of hadrian. The linker script is used for
merging object files into a single `HS*.o` object file and undoing the
effect of split sections, when building the "ghci library" object
file. However, we don't build the ghci library on windows, and this
code path is actually unreachable.
- - - - -
53038ea9 by Cheng Shao at 2026-01-05T16:24:04-05:00
hadrian: drop unused logic for building ghci libraries
This patch drops the unused logic for building ghci libraries in
hadrian:
- The term "ghci library" refers to an optional object file per
library `HS*.o`, which is merged from multiple object files in that
library using the `MergeObjects` builder in hadrian.
- The original rationale of having a ghci library object, in addition
to normal archives, was to speedup ghci loading, since the combined
object is linked with a linker script to undo the effects of
`-fsplit-sections` to reduce section count and make it easier for
the RTS linker to handle.
- However, most GHC builds enable `dynamicGhcPrograms` by default, in
such cases the ghci library would already not be built.
- `dynamicGhcPrograms` is disabled on Windows, but still we don't
build the ghci library due to lack of functioning merge objects
command.
- The only case that we actually build ghci library objects, are
alpine fully static bindists. However, for other reasons, split
sections is already disabled for fully static builds anyway!
- There will not be any regression if the ghci library objects are
absent from a GHC global libdir when `dynamicGhcPrograms` is
disabled. The RTS linker can already load the archives without any
issue.
Hence the removal. We now forcibly disable ghci libraries for all
Cabal components, and rip out all logic related to `MergeObjects` and
ghci libraries in hadrian. This also nicely cleans up some old todos
and fixmes that are no longer relevant.
Note that MergeObjects in hadrian is not the same thing as merge
objects in the GHC driver. The latter is not affected by this patch.
-------------------------
Metric Decrease:
libdir
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
8f209336 by Simon Jakobi at 2026-01-05T16:24:48-05:00
User's guide: Fix link to language extensions
Instead of linking to haddocks, it seemed more useful to link
to the extension overview in the user's guide.
Closes #26614.
- - - - -
0b7df6db by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Improved fundeps for closed type families
The big payload of this commit is to execute the plan suggested
in #23162, by improving the way that we generate functional
dependencies for closed type families.
It is all described in Note [Exploiting closed type families]
Most of the changes are in GHC.Tc.Solver.FunDeps
Other small changes
* GHC.Tc.Solver.bumpReductionDepth. This function brings together the code that
* Bumps the depth
* Checks for overflow
Previously the two were separated, sometimes quite widely.
* GHC.Core.Unify.niFixSubst: minor improvement, removing an unnecessary
itraetion in the base case.
* GHC.Core.Unify: no need to pass an InScopeSet to
tcUnifyTysForInjectivity. It can calculate one for itself; and it is
never inspected anyway so it's free to do so.
* GHC.Tc.Errors.Ppr: slight impovement to the error message for
reduction-stack overflow, when a constraint (rather than a type) is
involved.
* GHC.Tc.Solver.Monad.wrapUnifier: small change to the API
- - - - -
fde8bd88 by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Add missing (KK4) to kick-out criteria
There was a missing case in kick-out that meant we could fail
to solve an eminently-solvable constraint.
See the new notes about (KK4)
- - - - -
00082844 by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Some small refactorings of error reporting in the typechecker
This is just a tidy-up commit.
* Add ei_insoluble to ErrorItem, to cache insolubility.
Small tidy-up.
* Remove `is_ip` and `mkIPErr` from GHC.Tc.Errors; instead enhance mkDictErr
to handle implicit parameters. Small refactor.
- - - - -
fe4cb252 by Simon Peyton Jones at 2026-01-06T09:32:24-05:00
Improve recording of insolubility for fundeps
This commit addresses #22652, by recording when the fundeps for
a constraint are definitely insoluble. That in turn improves the
perspicacity of the pattern-match overlap checker.
See Note [Insoluble fundeps]
- - - - -
df0ffaa5 by Simon Peyton Jones at 2026-01-06T09:32:24-05:00
Fix a buglet in niFixSubst
The MR of which this is part failed an assertion check extendTvSubst
because we extended the TvSubst with a CoVar. Boo.
This tiny patch fixes it, and adds the regression test from #13882
that showed it up.
- - - - -
3d6aba77 by konsumlamm at 2026-01-06T09:33:16-05:00
Fix changelog formatting
- - - - -
69e0ab59 by Cheng Shao at 2026-01-06T19:37:56-05:00
compiler: add targetHasRTSWays function
This commit adds a `targetHasRTSWays` util function in
`GHC.Driver.Session` to query if the target RTS has a given Ways (e.g.
WayThreaded).
- - - - -
25a0ab94 by Cheng Shao at 2026-01-06T19:37:56-05:00
compiler: link on-demand external interpreter with threaded RTS
This commit makes the compiler link the on-demand external interpreter
program with threaded RTS if it is available in the target RTS ways.
This is a better default than the previous single-threaded RTS, and it
enables the external interpreter to benefit from parallelism when
deserializing CreateBCOs messages.
- - - - -
92404a2b by Cheng Shao at 2026-01-06T19:37:56-05:00
hadrian: link iserv with threaded RTS
This commit makes hadrian link iserv with threaded RTS if it's
available in the RTS ways. Also cleans up the iserv main C program
which can be replaced by the `-fkeep-cafs` link-time option.
- - - - -
a20542d2 by Cheng Shao at 2026-01-06T19:38:38-05:00
ghc-internal: remove unused GMP macros
This patch removes unused GMP related macros from `ghc-internal`. The
in-tree GMP version was hard coded and outdated, but it was not used
anywhere anyway.
- - - - -
4079dcd6 by Cheng Shao at 2026-01-06T19:38:38-05:00
hadrian: fix in-tree gmp configure error on newer c compilers
Building in-tree gmp on newer c compilers that default to c23 fails at
configure stage, this patch fixes it, see added comment for
explanation.
- - - - -
414d1fe1 by Cheng Shao at 2026-01-06T19:39:20-05:00
compiler: fix LLVM backend pdep/pext handling for i386 target
This patch fixes LLVM backend's pdep/pext handling for i386 target,
and also removes non-existent 128/256/512 bit hs_pdep/hs_pext callees.
See amended note for more explanation. Fixes #26450.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
c7f6fba3 by Cheng Shao at 2026-01-06T19:39:20-05:00
ci: remove allow_failure flag for i386 alpine job
The LLVM codegen issue for i386 has been fixed, and the i386 alpine
job should pass now. This commit removes the allow_failure flag so
that other i386 regressions in the future are signaled more timely.
- - - - -
52d00c05 by Simon Peyton Jones at 2026-01-07T10:24:21-05:00
Add missing InVar->OutVar lookup in SetLevels
As #26681 showed, the SetLevels pass was failing to map an InVar to
an OutVar. Very silly! I'm amazed it hasn't broken before now.
I have improved the type singatures (to mention InVar and OutVar)
so it's more obvious what needs to happen.
- - - - -
ab0a5594 by Cheng Shao at 2026-01-07T10:25:04-05:00
hadrian: drop deprecated pkgHashSplitObjs code path
This patch drops deprecated `pkgHashSplitObjs` code path from hadrian,
since GHC itself has removed split objs support many versions ago and
this code path is unused.
- - - - -
bb3a2ba1 by Cheng Shao at 2026-01-07T10:25:44-05:00
hadrian: remove linting/assertion in quick-validate flavour
The `quick-validate` flavour is meant for testing ghc and passing the
testsuite locally with similar settings to `validate` but faster. This
patch removes the linting/assertion overhead in `quick-validate` to
improve developer experience. I also took the chance to simplify
redundant logic of rts/library way definition in `validate` flavour.
- - - - -
7971f5dd by Cheng Shao at 2026-01-07T10:26:26-05:00
deriveConstants: clean up unused constants
This patch cleans up unused constants from `deriveConstants`, they are
not used by C/Cmm code in the RTS, nor compiler-generated code.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
4df96993 by Cheng Shao at 2026-01-07T10:27:08-05:00
hadrian: pass -fno-omit-frame-pointer with +debug_info
This patch adds `-fno-omit-frame-pointer` as C/C++ compilation flag
when compiling with `+debug_info` flavour transformer. It's a sane
default when you care about debugging and reliable backtraces, and
makes debugging/profiling with bpf easier.
- - - - -
8a3900a3 by Aaron Allen at 2026-01-07T10:27:57-05:00
[26705] Include TyCl instances in data fam iface entry
Ensures dependent modules are recompiled when the class instances for a
data family instance change.
resolves #26705
- - - - -
a0b980af by Cheng Shao at 2026-01-07T10:28:38-05:00
hadrian: remove unused Hp2Ps/Hpc builders
This patch removes the Hp2Ps/Hpc builders from hadrian, they are
unused in the build system. Note that the hp2ps/hpc programs are still
built and not affected.
- - - - -
50a58757 by Cheng Shao at 2026-01-07T10:29:20-05:00
hadrian: only install js files to libdir for wasm/js targets
There are certain js files required for wasm/js targets to work, and
previously hadrian would install those js files to libdir
unconditionally on other targets as well. This could be a minor
annoyance for packagers especially when the unused js files contain
shebangs that interfere with the packaging process. This patch makes
hadrian only selectively install the right js files for the right
targets.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
da40e553 by Simon Peyton Jones at 2026-01-07T10:30:00-05:00
Add flavour transformer assertions_stage1
This allows us to enable -DDEBUG assertions in the stage1 compiler
- - - - -
ec3cf767 by Cheng Shao at 2026-01-08T06:24:31-05:00
make: remove unused Makefiles from legacy make build system
This patch removes unused Makefiles from legacy make build system; now
they are never used by hadrian in any way, and they already include
common boilerplate mk files that are long gone in the make build
system removal, hence the housecleaning.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
04ea3f83 by Cheng Shao at 2026-01-08T06:25:13-05:00
compiler: use -O3 as LLVM optimization level for ghc -O2
The GHC driver clamps LLVM optimization level to `-O2` due to LLVM
crashes, but those were historical issues many years ago that are no
longer relevant for LLVM versions we support today. This patch changes
the driver to use `-O3` as LLVM optimization level when compiling with
`-O2`, which is a better default when we're willing to trade
compilation time for faster generated code.
- - - - -
472df471 by Peter Trommler at 2026-01-08T13:28:54-05:00
Use half-word literals in info tables
With this commit info tables are mapped to the same assembler code
on big-endian and little-endian platforms.
Fixes #26579.
- - - - -
393f9c51 by Simon Peyton Jones at 2026-01-08T13:29:35-05:00
Refactor srutOkForBinderSwap
This MR does a small refactor:
* Moves `scrutOkForBinderSwap` and `BinderSwapDecision`
to GHC.Core.Utils
* Inverts the sense of the coercion it returns, which makes
more sense
No effect on behaviour
- - - - -
ad76fb0f by Simon Peyton Jones at 2026-01-08T13:29:36-05:00
Improve case merging
This small MR makes case merging happen a bit more often than
it otherwise could, by getting join points out of the way.
See #26709 and GHC.Core.Utils
Note [Floating join points out of DEFAULT alternatives]
- - - - -
4c9395f5 by Cheng Shao at 2026-01-08T13:30:16-05:00
hadrian: remove broken hsc2hs flag when cross compiling to windows
This patch removes the `--via-asm` hsc2hs flag when cross compiling to
windows. With recent llvm-mingw toolchain, it would fail with:
```
x86_64-w64-mingw32-hsc2hs: Cannot combine instructions: [Quad 8,Long 4,Long 241,Ref ".Ltmp1-.Ltmp0"]
```
The hsc2hs default `--cross-compile` logic is slower but works.
- - - - -
71fdef55 by Simon Peyton Jones at 2026-01-08T13:30:57-05:00
Try harder to keep the substitution empty
Avoid unnecessary cloning of variables in the Simplifier.
Addresses #26724,
See Note [Keeping the substitution empty]
We get some big wins in compile time
Metrics: compile_time/bytes allocated
-------------------------------------
Baseline
Test Metric value New value Change
----------------------------------------------------------------------------
CoOpt_Singletons(normal) ghc/alloc 721,544,088 692,174,216 -4.1% GOOD
LargeRecord(normal) ghc/alloc 1,268,031,157 1,265,168,448 -0.2%
T14766(normal) ghc/alloc 918,218,533 688,432,296 -25.0% GOOD
T15703(normal) ghc/alloc 318,103,629 306,638,016 -3.6% GOOD
T17836(normal) ghc/alloc 419,174,584 418,400,824 -0.2%
T18478(normal) ghc/alloc 471,042,976 470,261,376 -0.2%
T20261(normal) ghc/alloc 573,387,162 563,663,336 -1.7%
T24984(normal) ghc/alloc 87,832,666 87,636,168 -0.2%
T25196(optasm) ghc/alloc 1,103,284,040 1,101,376,992 -0.2%
hard_hole_fits(normal) ghc/alloc 224,981,413 224,608,208 -0.2%
geo. mean -0.3%
minimum -25.0%
maximum +0.1%
Metric Decrease:
CoOpt_Singletons
T14766
T15703
- - - - -
30341168 by Simon Peyton Jones at 2026-01-08T13:31:38-05:00
Add regression test for #24867
- - - - -
1ac1a541 by Julian Ospald at 2026-01-09T02:48:53-05:00
Support statically linking executables properly
Fixes #26434
In detail, this does a number of things:
* Makes GHC aware of 'extra-libraries-static' (this changes the package
database format).
* Adds a switch '-static-external' that will honour 'extra-libraries-static'
to link external system dependencies statically.
* Adds a new field to settings/targets: "ld supports verbatim namespace".
This field is used by '-static-external' to conditionally use '-l:foo.a'
syntax during linking, which is more robust than trying to find the
absolute path to an archive on our own.
* Adds a switch '-fully-static' that is meant as a high-level interface
for e.g. cabal. This also honours 'extra-libraries-static'.
This also attempts to clean up the confusion around library search directories.
At the moment, we have 3 types of directories in the package database
format:
* library-dirs
* library-dirs-static
* dynamic-library-dirs
However, we only have two types of linking: dynamic or static. Given the
existing logic in 'mungeDynLibFields', this patch assumes that
'library-dirs' is really just nothing but a fallback and always
prefers the more specific variants if they exist and are non-empty.
Conceptually, we should be ok with even just one search dirs variant.
Haskell libraries are named differently depending on whether they're
static or dynamic, so GHC can conveniently pick the right one depending
on the linking needs. That means we don't really need to play tricks
with search paths to convince the compiler to do linking as we want it.
For system C libraries, the convention has been anyway to place static and
dynamic libs next to each other, so we need to deal with that issue
anyway and it is outside of our control. But this is out of the scope
of this patch.
This patch is backwards compatible with cabal. Cabal should however
be patched to use the new '-fully-static' switch.
- - - - -
ad3c808d by Julian Ospald at 2026-01-09T02:48:53-05:00
Warn when "-dynamic" is mixed with "-staticlib"
- - - - -
322dd672 by Matthew Pickering at 2026-01-09T02:49:35-05:00
rts: Use INFO_TABLE_CONSTR for stg_dummy_ret_closure
Since the closure type is CONSTR_NOCAF, we need to use INFO_TABLE_CONSTR
to populate the constructor description field (this crashes ghc-debug
when decoding AP_STACK frames sometimes)
Fixes #26745
- - - - -
039bac4c by Ben Gamari at 2026-01-09T20:22:16-05:00
ghc-internal: Move STM utilities out of GHC.Internal.Conc.Sync
This is necessary to avoid an import cycle on Windows when importing
`GHC.Internal.Exception.Context` in `GHC.Internal.Conc.Sync`.
On the road to address #25365.
- - - - -
8c389e8c by Ben Gamari at 2026-01-09T20:22:16-05:00
base: Capture backtrace from throwSTM
Implements core-libraries-committee#297.
Fixes #25365.
- - - - -
e1ce1fc3 by Ben Gamari at 2026-01-09T20:22:16-05:00
base: Annotate rethrown exceptions in catchSTM with WhileHandling
Implements core-libraries-committee#298
- - - - -
c4ebdbdf by Cheng Shao at 2026-01-09T20:23:06-05:00
compiler: make getPrim eagerly evaluate its result
This commit makes `GHC.Utils.Binary.getPrim` eagerly evaluate its
result, to avoid accidental laziness when future patches build other
binary parsers using `getPrim`.
- - - - -
66a0c4f7 by Cheng Shao at 2026-01-09T20:23:06-05:00
compiler: implement fast get/put for Word16/Word32/Word64
Previously, `GHC.Utils.Binary` contains `get`/`put` functions for
`Word16`/`Word32`/`Word64` which always loads and stores them as
big-endian words at a potentially unaligned address. The previous
implementation is based on loads/stores of individual bytes and
concatenating bytes with bitwise operations, which currently cannot be
fused to a single load/store operation by GHC.
This patch implements fast `get`/`put` functions for
`Word16`/`Word32`/`Word64` based on a single memory load/store, with
an additional `byteSwap` operation on little-endian hosts. It is based
on unaligned load/store primops added since GHC 9.10, and we already
require booting with at least 9.10, so it's about time to switch to
this faster path.
- - - - -
641ec3f0 by Simon Peyton Jones at 2026-01-09T20:23:55-05:00
Fix scoping errors in specialisation
Using -fspecialise-aggressively in #26682 showed up a couple of
subtle errors in the type-class specialiser.
* dumpBindUDs failed to call `deleteCallsMentioning`, resulting in a
call that mentioned a dictionary that was not in scope. This call
has been missing since 2009!
commit c43c981705ec33da92a9ce91eb90f2ecf00be9fe
Author: Simon Peyton Jones <simonpj(a)microsoft.com>
Date: Fri Oct 23 16:15:51 2009 +0000
Fixed by re-combining `dumpBindUDs` and `dumpUDs`.
* I think there was another bug involving the quantified type
variables in polymorphic specialisation. In any case I refactored
`specHeader` and `spec_call` so that the former looks for the
extra quantified type variables rather than the latter. This
is quite a worthwhile simplification: less code, easier to grok.
Test case in simplCore/should_compile/T26682,
brilliantly minimised by @sheaf.
- - - - -
2433e91d by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: change sectionProtection to take SectionType argument
This commit changes `sectionProtection` to only take `SectionType`
argument instead of whole `Section`, since it doesn't need the Cmm
section content anyway, and it can then be called in parts of NCG
where we only have a `SectionType` in scope.
- - - - -
e5926fbe by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: change isInitOrFiniSection to take SectionType argument
This commit changes `isInitOrFiniSection` to only take `SectionType`
argument instead of whole `Section`, since it doesn't need the Cmm
section content anyway, and it can then be called in parts of NCG
where we only have a `SectionType` in scope. Also marks it as
exported.
- - - - -
244d57d7 by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: fix split sections on windows
This patch fixes split sections on windows by emitting the right
COMDAT section header in NCG, see added comment for more explanation.
Fix #26696 #26494.
-------------------------
Metric Decrease:
LargeRecord
T9675
size_hello_artifact
size_hello_artifact_gzip
size_hello_unicode
size_hello_unicode_gzip
Metric Increase:
T13035
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
182f3d0f by Cheng Shao at 2026-01-09T20:25:28-05:00
iserv: add comment about -fkeep-cafs
- - - - -
49675b69 by Matthew Craven at 2026-01-09T20:26:14-05:00
Account for "stupid theta" in demand sig for DataCon wrappers
Fixes #26748.
- - - - -
f3c18890 by Samuel Thibault at 2026-01-10T15:48:22+01:00
hurd: Fix getExecutablePath build
3939a8bf93e27 ("GNU/Hurd: Add getExecutablePath support") added using
/proc/self/exe for GNU/Hurd but missed adding the required imports for
the corresponding code.
- - - - -
7f15bd15 by Samuel Thibault at 2026-01-12T07:16:25-05:00
Fix the OS string encoding for GNU/Hurd
Following https://github.com/haskell/cabal/pull/9434/files , and as seen
in the various gnu_HOST_OS usages in the source code, it is expected that
GNU/Hurd is advertised as "gnu", like the autotools do.
- - - - -
1db2f240 by Andrew Lelechenko at 2026-01-12T07:17:06-05:00
Add since annotation for Data.Bifoldable1
Fixes #26432
- - - - -
e038a383 by Sven Tennie at 2026-01-12T07:17:49-05:00
Ignore Windows CI tool directories in Git
Otherwise, we see thousands of changes in `git status` which is very
confusing to work with.
- - - - -
023c301c by sheaf at 2026-01-13T04:57:30-05:00
Don't re-use stack slots for growing registers
This commit avoids re-using a stack slot for a register that has grown
but already had a stack slot.
For example, suppose we have stack slot assigments
%v1 :: FF64 |-> StackSlot 0
%v2 :: FF64 |-> StackSlot 1
Later, we start using %v1 at a larger format (e.g. F64x2) and we need
to spill it again. Then we **must not** use StackSlot 0, as a spill
at format F64x2 would clobber the data in StackSlot 1.
This can cause some fragmentation of the `StackMap`, but that's probably
OK.
Fixes #26668
- - - - -
d0966e64 by fendor at 2026-01-13T04:58:11-05:00
Remove `traceId` from ghc-pkg executable
- - - - -
20d7efec by Simon Peyton Jones at 2026-01-13T12:41:22-05:00
Make SpecContr rules fire a bit later
See #26615 and Note [SpecConstr rule activation]
- - - - -
8bc4eb8c by Andrew Lelechenko at 2026-01-13T12:42:03-05:00
Upgrade mtl submodule to 2.3.2
Fixes #26656
- - - - -
c94aaacd by Cheng Shao at 2026-01-13T12:42:44-05:00
compiler: remove iserv and only use on-demand external interpreter
This patch removes `iserv` from the tree completely. Hadrian would no
longer build or distribute `iserv`, and the GHC driver would use the
on-demand external interpreter by default when invoked with
`-fexternal-interpreter`, without needing to specify `-pgmi ""`. This
has multiple benefits:
- It allows cleanup of a lot of legacy hacks in the hadrian codebase.
- It paves the way for running cross ghc's iserv via cross emulator
(#25523), fixing TH/ghci support for cross targets other than
wasm/js.
- - - - -
c1fe0097 by Peter Trommler at 2026-01-14T03:54:49-05:00
PPC NCG: Fix shift right MO code
The shift amount in shift right [arithmetic] MOs is machine word
width. Therefore remove unnecessary zero- or sign-extending of
shift amount.
It looks harmless to extend the shift amount argument because the
shift right instruction uses only the seven lowest bits (i. e. mod 128).
But now we have a conversion operation from a smaller type to word width
around a memory load at word width. The types are not matching up but
there is no check done in CodeGen. The necessary conversion from word
width down to the smaller width would be translated into a no-op on
PowerPC anyway. So all seems harmless if it was not for a small
optimisation in getRegister'.
In getRegister' a load instruction with the smaller width of the
conversion operation was generated. This loaded the most significant
bits of the word in memory on a big-endian platform. These bits were
zero and hence shift right was used with shift amount zero and not one
as required in test Sized.
Fixes #26519
- - - - -
2dafc65a by Cheng Shao at 2026-01-14T03:55:31-05:00
Tree-wide cleanup of cygwin logic
GHC has not supported cygwin for quite a few years already, and will
not resume support in the forseeable future. The only supported
windows toolchain is clang64/clangarm64 of the msys2 project. This
patch cleans up the unused cygwin logic in the tree.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
66b96e2a by Teo Camarasu at 2026-01-14T03:56:13-05:00
Set default eventlog-flush-interval to 5s
Resolves #26707
- - - - -
d0254579 by Andrew Lelechenko at 2026-01-14T03:56:53-05:00
Document when -maxN RTS option was added
- - - - -
f25e2b12 by Cheng Shao at 2026-01-14T11:10:39-05:00
testsuite: remove obsolete --ci option from the testsuite driver
This patch removes the obsolete `--ci` option from the testsuite
driver: neither the CI scripts nor hadrian ever invokes the testsuite
driver with `--ci`, and the perf notes are always fetched to the
`refs/notes/perf` local reference anyway.
- - - - -
7964763b by Julian Ospald at 2026-01-14T11:11:31-05:00
Fix fetch_cabal
* download cabal if the existing one is of an older version
* fix FreeBSD download url
* fix unpacking on FreeBSD
- - - - -
6b0129c1 by Julian Ospald at 2026-01-14T11:11:31-05:00
Bump toolchain in CI
- - - - -
0f53ccc6 by Julian Ospald at 2026-01-14T11:11:31-05:00
Use libffi-clib
Previously, we would build libffi via hadrian
and bundle it manually with the GHC bindist.
This now moves all that logic out of hadrian
and allows us to have a clean Haskell package
to build and link against and ship it without
extra logic.
This patch still retains the ability to link
against a system libffi.
The main reason of bundling libffi was that on
some platforms (e.g. FreeBSD and Mac), system libffi
is not visible to the C toolchain by default,
so users would require settings in e.g. cabal
to be able to compile anything.
This adds the submodule libffi-clib to the repository.
- - - - -
5e1cd595 by Peng Fan at 2026-01-14T11:12:26-05:00
NCG/LA64: add support for la664 micro architecture
Add '-mla664' flag to LA664, which has some new features:
atomic instructions, dbar hints, etc.
'LA464' is the default so that unrecognized instructions are not
generated.
- - - - -
c56567ec by Simon Peyton Jones at 2026-01-15T23:19:04+00:00
Add evals for strict data-con args in worker-functions
This fixes #26722, by adding an eval in a worker for
arguments of strict data constructors, even if the
function body uses them strictly.
See (WIS1) in Note [Which Ids should be strictified]
I took the opportunity to make substantial improvements in the
documentation for call-by-value functions. See especially
Note [CBV Function Ids: overview] in GHC.Types.Id.Info
Note [Which Ids should be CBV candidates?] ditto
Note [EPT enforcement] in GHC.Stg.EnforceEpt
among others.
- - - - -
9719ce5d by Simon Peyton Jones at 2026-01-15T23:19:04+00:00
Improve `interestingArg`
This function analyses a function's argument to see if it is
interesting enough to deserve an inlining discount. Improvements
for
* LitRubbish arguments
* exprIsExpandable arguments
See Note [Interesting arguments] which is substantially rewritten.
- - - - -
7b616b9f by Cheng Shao at 2026-01-16T06:45:00-05:00
compiler: fix regression when compiling foreign stubs in the rts unit
This patch fixes a regression when compiling foreign stubs in the rts
unit introduced in 05e25647f72bc102061af3f20478aa72bff6ff6e. A simple
revert would fix it, but it's better to implement a proper fix with
comment for better understanding of the underlying problem, see the
added comment for explanation.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
c343ef64 by Sylvain Henry at 2026-01-16T06:45:51-05:00
base: remove GHC.JS.Prim.Internal.Build (#23432)
See accepted CLC proposal https://github.com/haskell/core-libraries-committee/issues/329
- - - - -
29c0aceb by Simon Peyton Jones at 2026-01-16T17:18:11-05:00
Improve newtype unwrapping
Ticket #26746 describes several relatively-minor shortcomings of newtype
unwrapping. This MR addresses them, while also (arguably) simplifying
the code a bit.
See new Note [Solving newtype equalities: overview]
and Note [Decomposing newtype equalities]
and Note [Eager newtype decomposition]
and Note [Even more eager newtype decomposition]
For some reason, on Windows only, runtime allocations decrease for test
T5205 (from 52k to 48k). I have not idea why. No change at all on Linux.
I'm just going to accept the change. (I saw this same effect in another
MR so I think it's a fault in the baseline.)
Metric Decrease:
T5205
- - - - -
8b59e62c by Andreas Klebinger at 2026-01-16T17:18:52-05:00
testsuite: Widen acceptance window for T5205.
Fixes #26782
- - - - -
9e5e0234 by mangoiv at 2026-01-17T06:03:03-05:00
add a new issue template for getting verified
To reduce spam created by new users, we will in future not grant
any rights but reporting issues to new users. That is why we will
have to be able to verify them. The added issue template serves that
purpose.
- - - - -
b18b2c42 by Cheng Shao at 2026-01-17T06:03:44-05:00
llvm: fix split sections for llvm backend
This patch fixes split sections for llvm backend:
- Pass missing `--data-sections`/`--function-sections` flags to
llc/opt.
- Use `@llvm.compiler.used` instead of `@llvm.used` to avoid sections
being unnecessarily retained at link-time.
Fixes #26770.
-------------------------
Metric Decrease:
libdir
size_hello_artifact
size_hello_unicode
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
ebf66f67 by Cheng Shao at 2026-01-17T13:16:50-05:00
Update autoconf scripts
Scripts taken from autoconf a2287c3041a3f2a204eb942e09c015eab00dc7dd
- - - - -
598624b9 by Andreas Klebinger at 2026-01-17T13:17:32-05:00
CString.hs: Update incorrect comment.
Fixes #26322
- - - - -
eea2036b by Cheng Shao at 2026-01-18T10:00:49-05:00
libraries: bump haskeline submodule to 0.8.4.1
This patch bumps the haskeline submodule to 0.8.4.1 which includes an
important fix for an ANSI handling bug on Windows
(https://github.com/haskell/haskeline/pull/126)
- - - - -
87d8f6c2 by Cheng Shao at 2026-01-18T10:01:30-05:00
hadrian: replace default -H32m/-H64m with -O64M to improve mutator productivity
Most hadrian build flavours pass `-H32m`/`-H64m` to GHC as
conventional wisdom to improve mutator productivity and reduce GC
overhead. They were inherited from the legacy Make build system, and
there used to be make flags to instrument a build process with
`-Rghc-timing` option to collect GC stats of each GHC run from stderr.
It's time to revisit whether there are better defaults for
`-H32m`/`-H64m`, and this patch changes it to `-O64M` which indeed
improves mutator productivity based on real statistics. `-O64M` is
more aggressive than `-H64m`; it allows the old generation to grow to
at least 64M before triggering major GC and reduces major GC runs.
The stats of a clean build with `validate` flavour and `-H64m`:
```
h64m.log
matched RTS stat lines: 5499
sum MUT cpu : 2400.808 s
sum GC cpu : 1378.292 s
sum MUT elapsed : 2788.253 s
sum GC elapsed : 1389.233 s
GC/MUT cpu ratio : 0.574 (GC is 57.4% of MUT)
GC/MUT elapsed ratio : 0.498 (GC is 49.8% of MUT)
GC fraction of (MUT+GC) cpu : 36.5%
GC fraction of (MUT+GC) elapsed : 33.3%
per-line GC/MUT cpu ratio: median 0.691, p90 1.777
per-line GC/MUT elapsed ratio: median 0.519, p90 1.081
```
The stats of a clean build with `validate` flavour and `-O64M`:
```
o64m.log
matched RTS stat lines: 5499
sum MUT cpu : 2377.383 s
sum GC cpu : 1127.146 s
sum MUT elapsed : 2758.857 s
sum GC elapsed : 1135.587 s
GC/MUT cpu ratio : 0.474 (GC is 47.4% of MUT)
GC/MUT elapsed ratio : 0.412 (GC is 41.2% of MUT)
GC fraction of (MUT+GC) cpu : 32.2%
GC fraction of (MUT+GC) elapsed : 29.2%
per-line GC/MUT cpu ratio: median 0.489, p90 1.099
per-line GC/MUT elapsed ratio: median 0.367, p90 0.806
```
Mutator time is roughly in the same ballpark, but GC CPU time has
reduced by 18.22%, and mutator productivity has increased from 63.5%
to 67.8%.
- - - - -
8372e13d by Cheng Shao at 2026-01-18T10:02:12-05:00
rts: remove unused .def files from rts/win32
This patch removes unused .def files from `rts/win32`, given we don't
build .dll files for rts/ghc-internal/ghc-prim at all. Even when we
resurrect win32 dll support at some point in the future, these .def
files still contain incorrect symbols anyway and won't be of any use.
- - - - -
f6af485d by Cheng Shao at 2026-01-18T10:03:19-05:00
.gitmodules: use gitlab mirror for the libffi-clib submodule
This patch fixes .gitmodules to use the gitlab mirror for the
libffi-clib submodule, to make it coherent with other submodules that
allow ghc developers to experiment with wip branches in submodules for
ghc patches. Fixes #26783.
- - - - -
41432d25 by Cheng Shao at 2026-01-18T10:05:13-05:00
hadrian: remove the horrible i386 speedHack
When hadrian builds certain rts objects for i386, there's a horrible
speedHack that forces -fno-PIC even for dynamic ways of those objects.
This is not compatible with newer versions of gcc/binutils as well as
clang/lld, and this patch removes it. Fixes #26792.
- - - - -
323eb8f0 by Cheng Shao at 2026-01-18T21:48:19-05:00
hadrian: enable split sections for cross stage0
This patch fixes a minor issue with `splitSectionsArgs` in hadrian:
previously, it's unconditionally disabled for stage0 libraries because
it's not going to be shipped in the final bindists. But it's only true
when not cross compiling. So for now we also need to enable it for
cross stage0 as well.
- - - - -
3fadfefe by Andreas Klebinger at 2026-01-18T21:49:01-05:00
RTS: Document -K behaviour better
- - - - -
30f442a9 by Teo Camarasu at 2026-01-20T13:57:26-05:00
base: don't expose GHC.Num.{BigNat, Integer, Natural}
We no longer expose GHC.Num.{BigNat, Integer, Natural} from base instead users should get these modules from ghc-bignum.
We make this change to insulate end users from changes to GHC's implementation of big numbers.
Implements CLC proposal 359: https://github.com/haskell/core-libraries-committee/issues/359
- - - - -
75a9053d by Teo Camarasu at 2026-01-20T13:58:07-05:00
base: deprecate GHC internals in GHC.Num
Implements CLC proposal: https://github.com/haskell/core-libraries-committee/issues/360
- - - - -
9534b032 by Andreas Klebinger at 2026-01-20T13:58:50-05:00
ghc-experimental: Update Changelog
I tried to reconstruct a high level overview of the changes and when
they were made since we introduced it.
Fixes #26506
Co-authored-by: Teo Camarasu <teofilcamarasu(a)gmail.com>
- - - - -
346f2f5a by Cheng Shao at 2026-01-20T13:59:30-05:00
hadrian: remove RTS options in ghc-in-ghci flavour
This patch removes the RTS options passed to ghc in ghc-in-ghci
flavour, to workaround command line argument handling issue in
hls/hie-boot that results in `-O64M` instead of `+RTS -O64M -RTS`
being passed to ghc. It's not a hadrian bug per se, since ghc's own
ghc-in-ghci multi repl works fine, but we should still make sure HLS
works. Closes #26801.
- - - - -
759fd15a by Andreas Klebinger at 2026-01-21T16:05:28-05:00
Don't build GHC with -Wcompat
Without bumping the boot compiler the warnings it produces are often not
actionable leading to pointless noise.
Fixes #26800
- - - - -
3172db94 by Torsten Schmits at 2026-01-21T16:06:11-05:00
Use the correct field of ModOrigin when formatting error message listing hidden reexports
- - - - -
485c12b2 by Cheng Shao at 2026-01-21T16:06:54-05:00
Revert "hadrian: handle findExecutable "" gracefully"
This reverts commit 1e5752f64a522c4025365856d92f78073a7b3bba. The
underlying issue has been fixed in
https://github.com/haskell/directory/commit/75828696e7145adc09179111a0d631b…
and present since 1.3.9.0, and hadrian directory lower bound is
1.3.9.0, so we can revert our own in house hack now.
- - - - -
5efb58dc by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: fix typo in TICK_ALLOC_RTS
This patch fixes a typo in the `TICK_ALLOC_RTS` macro, the original
`bytes` argument was silently dropped. The Cmm code has its own
version of `TICK_ALLOC_RTS` not affected by this typo, it affected the
C RTS, and went unnoticed because the variable `n` happened to also be
available at its call site. But the number was incorrect. Also fixes
its call site since `WDS()` is not available in C.
- - - - -
c406ea69 by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: remove broken & unused ALLOC_P_TICKY
This patch removes the `ALLOC_P_TICKY` macro from the rts, it's
unused, and its expanded code is already broken.
- - - - -
34a27e20 by Simon Peyton Jones at 2026-01-21T16:08:17-05:00
Make the implicit-parameter class have representational role
This MR addresses #26737, by making the built-in class IP
have a representational role for its second parameter.
See Note [IP: implicit parameter class] in
ghc-internal:GHC.Internal.Classes.IP
In fact, IP is (unfortunately, currently) exposed by
base:GHC.Base, so we ran a quick CLC proposal to
agree the change:
https://github.com/haskell/core-libraries-committee/issues/385
Some (small) compilations get faster because they only need to
load (small) interface file GHC.Internal.Classes.IP.hi,
rather than (large) GHC.Internal.Classes.hi.
Metric Decrease:
T10421
T12150
T12425
T24582
T5837
T5030
- - - - -
ca79475f by Cheng Shao at 2026-01-21T16:09:00-05:00
testsuite: avoid re.sub in favor of simple string replacements
This patch refactors the testsuite driver and avoids the usage of
re.sub in favor of simple string replacements when possible. The
changes are not comprehensive, and there are still a lot of re.sub
usages lingering around the tree, but this already addresses a major
performance bottleneck in the testsuite driver that might has to do
with quadratic or worse slowdown in cpython's regular expression
engine when handling certain regex patterns with large strings.
Especially on i386, and i386 jobs are the bottlenecks of all full-ci
validate pipelines!
Here are the elapsed times of testing x86_64/i386 with -j48 before
this patch:
x86_64: `Build completed in 6m06s`
i386: `Build completed in 1h36m`
And with this patch:
x86_64: `Build completed in 4m55s`
i386: `Build completed in 4m23s`
Fixes #26786.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
88c93796 by Zubin Duggal at 2026-01-21T16:09:42-05:00
ghc-toolchain: Also configure windres on non-windows platforms.
It may be needed for cross compilation.
Fixes #24588
- - - - -
9788c0ec by Cheng Shao at 2026-01-21T16:10:24-05:00
ghci: print external interpreter trace messages to stderr instead of stdout
This patch makes ghci print external interpreter trace messages to
stderr instead of stdout, which is a much saner choice for diagnostic
information. Closes #26807.
- - - - -
0491f08a by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: don't use CAS without PARALLEL_GC on
If we're not using the parallel GC, there is no reason to do a costly
CAS. This was flagged as taking time in a perf profile.
- - - - -
211a8f56 by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: suffix parallel GC with "par" instead of "thr"
Avoid some potential confusion (see discussion in !15351).
- - - - -
77a23cbd by fendor at 2026-01-22T03:45:08-05:00
Remove blanket ignore that covers libraries/
- - - - -
18bf7f5c by Léana Jiang at 2026-01-22T08:58:45-05:00
doc: update Flavour type in hadrian user-settings
- - - - -
3d5a1365 by Cheng Shao at 2026-01-22T08:59:28-05:00
hadrian: add missing notCross predicate for stage0 -O0
There are a few hard-coded hadrian args that pass -O0 when compiling
some heavy modules in stage0, which only makes sense when not
cross-compiling and when cross-compiling we need properly optimized
stage0 packages. So this patch adds the missing `notCross` predicate
in those places.
- - - - -
ee937134 by Matthew Pickering at 2026-01-22T09:00:10-05:00
Fix ghc-experimental GHC.Exception.Backtrace.Experimental module
This module wasn't added to the cabal file so it was never compiled or
included in the library.
- - - - -
1b490f5a by Zubin Duggal at 2026-01-22T09:00:53-05:00
hadrian: Add ghc-{experimental,internal}.cabal to the list of dependencies of the doc target
We need these files to detect the version of these libraries
Fixes #26738
- - - - -
cdb74049 by Cheng Shao at 2026-01-22T14:52:36-05:00
rts: avoid Cmm loop to initialize Array#/SmallArray#
Previously, `newArray#`/`newSmallArray#` called an RTS C function to
allocate the `Array#`/`SmallArray#`, then used a Cmm loop to
initialize the elements. Cmm doesn't have native for-loop so the code
is a bit awkward, and it's less efficient than a C loop, since the C
compiler can effectively vectorize the loop with optimizations.
So this patch moves the loop that initializes the elements to the C
side. `allocateMutArrPtrs`/`allocateSmallMutArrPtrs` now takes a new
`init` argument and initializes the elements if `init` is non-NULL.
- - - - -
4c784f00 by Cheng Shao at 2026-01-22T14:53:19-05:00
Fix testsuite run for +ipe flavour transformer
This patch makes the +ipe flavour transformer pass the entire
testsuite:
- An RTS debug option `-DI` is added, the IPE trace information is now
only printed with `-DI`. The test cases that do require IPE trace
are now run with `-DI`.
- The testsuite config option `ghc_with_ipe` is added, enabled when
running the testsuite with `+ipe`, which skips a few tests that are
sensitive to eventlog output, allocation patterns etc that can fail
under `+ipe`.
This is the first step towards #26799.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
be8e5236 by Ben Gamari at 2026-01-23T03:28:45-05:00
hadrian: Bump QuickCheck upper bound
This patch bumps QuickCheck upper bound to 2.18. selftest rule
manually tested to work with current latest QuickCheck-2.17.1.0.
- - - - -
5aa328fb by Zubin Duggal at 2026-01-23T03:29:30-05:00
Add genindex to index.rst. This adds a link to the index in the navigation bar.
Fixes #26437
- - - - -
917ab8ff by Oleg Grenrus at 2026-01-23T10:52:55-05:00
Export labelThread from Control.Concurrent
- - - - -
3f5e8d80 by Cheng Shao at 2026-01-23T10:53:37-05:00
ci: only push perf notes on master/release branches
This patch fixes push_perf_notes logic in ci.sh to only push perf
notes on master/release branches. We used to unconditionally push perf
notes even in MRs, but the perf numbers in the wip branches wouldn't
be used as baseline anyway, plus this is causing a space leak in the
ghc-performance-notes repo. See #25317 for the perf notes repo size
problem.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
414b9593 by Cheng Shao at 2026-01-24T07:11:51-05:00
ci: remove duplicate keys in .gitlab-ci.yml
This patch removes accidentally duplicate keys in `.gitlab-ci.yml`.
The YAML spec doesn't allow duplicate keys in the first place, and
according to GitLab docs
(https://docs.gitlab.com/ci/yaml/yaml_optimization/#anchors) the
latest key overrides the earlier entries.
- - - - -
e5cb5491 by Cheng Shao at 2026-01-24T07:12:34-05:00
hadrian: drop obsolete configure/make builder logic for libffi
This patch drops obsolete hadrian logic around `Configure
libffiPath`/`Make libffiPath` builders, they are no longer needed
after libffi-clib has landed. Closes #26815.
- - - - -
2d160222 by Simon Hengel at 2026-01-24T07:13:17-05:00
Fix typo in roles.rst
- - - - -
56db94f7 by Peter Trommler at 2026-01-26T11:26:18+01:00
PPC NCG: Generate clear right insn at arch width
The clear right immediate (clrrxi) is only available in word and
doubleword width. Generate clrrxi instructions at architecture
width for all MachOp widths.
Fixes #24145
- - - - -
5957a8ad by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00
Add operations for obtaining operating-system handles
This contribution implements CLC proposal #369. It adds operations for
obtaining POSIX file descriptors and Windows handles that underlie
Haskell handles. Those operating system handles can also be obtained
without such additional operations, but this is more involved and, more
importantly, requires using internals.
- - - - -
86a0510c by Greg Steuck at 2026-01-27T06:12:34-05:00
Move flags to precede patterns for grep and read files directly
This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools.
There's no reason to use cat and pipe where direct file argument works.
- - - - -
50761451 by Cheng Shao at 2026-01-27T21:51:23-05:00
ci: update darwin boot ghc to 9.10.3
This patch updates darwin boot ghc to 9.10.3, along with other related
updates, and pays off some technical debt here:
- Update `nixpkgs` and use the `nixpkgs-25.05-darwin` channel.
- Update the `niv` template.
- Update LLVM to 21 and update `llvm-targets` to reflect LLVM 21
layout changes for arm64/x86_64 darwin targets.
- Use `stdenvNoCC` to prevent nix packaged apple sdk from being used
by boot ghc, and manually set `DEVELOPER_DIR`/`SDKROOT` to enforce
the usage of system-wide command line sdk for macos.
- When building nix derivation for boot ghc, run `configure` via the
`arch` command so that `configure` and its subprocesses pick up the
manually specified architecture.
- Remove the previous horrible hack that obliterates `configure` to
make autoconf test result in true. `configure` now properly does its
job.
- Remove the now obsolete configure args and post install settings
file patching logic.
- Use `scheme-small` for texlive to avoid build failures in certain
unused texlive packages, especially on x86_64-darwin.
- - - - -
94dcd15e by Matthew Pickering at 2026-01-27T21:52:05-05:00
Evaluate backtraces for "error" exceptions at the moment they are thrown
See Note [Capturing the backtrace in throw] and
Note [Hiding precise exception signature in throw] which explain the
implementation.
This commit makes `error` and `throw` behave the same with regard to
backtraces. Previously, exceptions raised by `error` would not contain
useful IPE backtraces.
I did try and implement `error` in terms of `throw` but it started to
involve putting diverging functions into hs-boot files, which seemed to
risky if the compiler wouldn't be able to see if applying a function
would diverge.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/383
Fixes #26751
- - - - -
ef35e3ea by Teo Camarasu at 2026-01-27T21:52:46-05:00
ghc-internal: move all Data instances to Data.Data
Most instances of Data are defined in GHC.Internal.Data.Data.
Let's move all remaining instance there.
This moves other modules down in the dependency hierarchy allowing for
more parallelism, and it decreases the likelihood that we would need to
load this heavy .hi file if we don't actually need it.
Resolves #26830
Metric Decrease:
T12227
T16875
- - - - -
5e0ec555 by sheaf at 2026-01-28T06:56:38-05:00
Add test case for #25679
This commit adds the T25679 test case. The test now passes, thanks to
commit 1e53277af36d3f0b6ad5491f70ffc5593a49dcfd.
Fixes #25679
- - - - -
f1cd1611 by sheaf at 2026-01-28T06:56:38-05:00
Improve defaulting of representational equalities
This commit makes the defaulting of representational equalities, introduced
in 1e53277a, a little bit more robust. Now, instead of calling the eager
unifier, it calls the full-blown constraint solver, which means that it can
handle some subtle situations, e.g. involving functional dependencies and
type-family injectivity annotations, such as:
type family F a = r | r -> a
type instance F Int = Bool
[W] F beta ~R Bool
- - - - -
25edf516 by sheaf at 2026-01-28T06:56:38-05:00
Improve errors for unsolved representational equalities
This commit adds a new field of CtLoc, CtExplanations, which allows the
typechecker to leave some information about what it has done. For the moment,
it is only used to improve error messages for unsolved representational
equalities. The typechecker will now accumulate, when unifying at
representational role:
- out-of-scope newtype constructors,
- type constructors that have nominal role in a certain argument,
- over-saturated type constructors,
- AppTys, e.g. `c a ~R# c b`, to report that we must assume that 'c' has
nominal role in its parameters,
- data family applications that do not reduce, potentially preventing
newtype unwrapping.
Now, instead of having to re-construct the possible errors after the fact,
we simply consult the CtExplanations field.
Additionally, this commit modifies the typechecker error messages that
concern out-of-scope newtype constructors. The error message now depends
on whether we have an import suggestion to provide to the user:
- If we have an import suggestion for the newtype constructor,
the message will be of the form:
The data constructor MkN of the newtype N is out of scope
Suggested fix: add 'MkN' to the import list in the import of 'M'
- If we don't have any import suggestions, the message will be
of the form:
NB: The type 'N' is an opaque newtype, whose constructor is hidden
Fixes #15850, #20289, #20468, #23731, #25949, #26137
- - - - -
4d0e6da1 by Simon Peyton Jones at 2026-01-28T06:57:19-05:00
Fix two bugs in short-cut constraint solving
There are two main changes here:
* Use `isSolvedWC` rather than `isEmptyWC` in `tryShortCutSolver`
The residual constraint may have some fully-solved, but
still-there implications, and we don't want them to abort short
cut solving! That bug caused #26805.
* In the short-cut solver, we abandon the fully-solved residual
constraint; but we may thereby lose track of Givens that are
needed, and either report them as redundant or prune evidence
bindings that are in fact needed.
This bug stopped the `constraints` package from compiling;
see the trail in !15389.
The second bug led me to (another) significant refactoring
of the mechanism for tracking needed EvIds. See the new
Note [Tracking needed EvIds] in GHC.Tc.Solver.Solve
It's simpler and much less head-scratchy now.
Some particulars:
* An EvBindsVar now tracks NeededEvIds
* We deal with NeededEvIds for an implication only when it is
fully solved. Much simpler!
* `tryShortCutTcS` now takes a `TcM WantedConstraints` rather than
`TcM Bool`, so that is can plumb the needed EvIds correctly.
* Remove `ic_need` and `ic_need_implic` from Implication (hooray),
and add `ics_dm` and `ics_non_dm` to `IC_Solved`.
Pure refactor
* Shorten data constructor `CoercionHole` to `CH`, following
general practice in GHC.
* Rename `EvBindMap` to `EvBindsMap` for consistency
- - - - -
662480b7 by Cheng Shao at 2026-01-28T06:58:00-05:00
ci: use debian validate bindists instead of fedora release bindists in testing stage
This patch changes the `abi-test`, `hadrian-multi` and `perf` jobs in
the full-ci pipeline testing stage to use debian validate bindists
instead of fedora release bindists, to increase pipeline level
parallelism and allow full-ci pipelines to complete earlier. Closes #26818.
- - - - -
39581ec6 by Cheng Shao at 2026-01-28T06:58:40-05:00
ci: run perf test with -j$cores
This patch makes the perf ci job compile Cabal with -j$cores to speed
up the job.
- - - - -
607b287b by Wolfgang Jeltsch at 2026-01-28T15:41:53+02:00
Remove `GHC.Desugar` from `base`
`GHC.Desugar` was deprecated and should have been removed in GHC 9.14.
However, the removal was forgotten, although there was a code block that
was intended to trigger a compilation error when the GHC version in use
was 9.14 or later. This code sadly didn’t work, because the
`__GLASGOW_HASKELL__` macro was misspelled as `__GLASGOW_HASKELL`.
- - - - -
e8f5a45d by sterni at 2026-01-29T04:19:18-05:00
users_guide: fix runtime error during build with Sphinx 9.1.0
Appears that pathto is stricter about what it accepts now.
Tested Sphinx 8.2.3 and 9.1.0 on the ghc-9.10 branch.
Resolves #26810.
Co-authored-by: Martin Weinelt <hexa(a)darmstadt.ccc.de>
- - - - -
ce2d62fb by Jessica Clarke at 2026-01-29T19:48:51-05:00
PPC NCG: Use libcall for 64-bit cmpxchg on 32-bit PowerPC
There is no native instruction for this, and even if there were a
register pair version we could use, the implementation here is assuming
the values fit in a single register, and we end up only using / defining
the low halves of the registers.
Fixes: b4d39adbb5 ("PrimOps: Add CAS op for all int sizes")
Fixes: #23969
- - - - -
43d97761 by Michael Karcher at 2026-01-29T19:49:43-05:00
NCG for PPC: add pattern for CmmRegOff to iselExpr64
Closes #26828
- - - - -
aeeb4a20 by Matthew Pickering at 2026-01-30T11:42:47-05:00
determinism: Use deterministic map for Strings in TyLitMap
When generating typeable evidence the types we need evidence for all
cached in a TypeMap, the order terms are retrieved from a type map
determines the order the bindings appear in the program.
A TypeMap is quite diligent to use deterministic maps, apart from in the
TyLitMap, which uses a UniqFM for storing strings, whose ordering
depends on the Unique of the FastString.
This can cause non-deterministic .hi and .o files.
An unexpected side-effect is the error message but RecordDotSyntaxFail8
changing. I looked into this with Sam and this change caused the
constraints to be solved in a different order which results in a
slightly different error message. I have accepted the new test, since
the output before was non-deterministic and the new output is consistent
with the other messages in that file.
Fixes #26846
- - - - -
9e4d70c2 by Andrew Lelechenko at 2026-01-30T11:43:29-05:00
Upgrade text submodule to 2.1.4
- - - - -
631fa5ae by Recursion Ninja at 2026-01-31T22:30:11+00:00
Decouple `L.S.H.Decls` from importing `GHC.Types.Basic`
Data-types within `GHC.Types.Basic` which describe components of
the AST are migrated to `Language.Haskell.Syntax.Basic`. Related
function definitions are also moved.
Types moved to L.H.S. because they are part of the AST:
* TopLevelFlag
* RuleName
Types moved from L.H.S. to GHC.Hs. because they are not needed in the AST:
* TyConFlavour
* TypeOrData
* NewOrData
Migrated instances:
* `Outputable` instances moved to in `GHC.Utils.Outputable`
* `Binary` instance of `Boxity` moved to to `GHC.Utils.Binary`
* Other `Binary` instances are orphans to be migrated later.
The `OverlapMode` data-type is given a TTG extension point.
The `OverlapFlag` data-type, which depends on `OverlapMode`,
is updated to support `OverlapMode` with a GHC "pass" type paramerter.
In order to avoid module import cycles, `OverlapMode` and `OverlapFlag`
are migrated to new modules (no way around this).
* Migrated `OverlapMode` to new module `Language.Haskell.Syntax.Overlap`
* Migrated `OverlapFlag` to new module `GHC.Hs.Decls.Overlap`
- - - - -
9769cc03 by Simon Hengel at 2026-02-01T04:21:03-05:00
Update the documentation for MultiWayIf (fixes #25376)
(so that it matches the implementation)
- - - - -
5fc9442a by Peter Trommler at 2026-02-01T04:21:44-05:00
hadrian: Fix dependency generation for assembler
Assembler files allow # for comments unless in column 1. A modern
cpp for C treats those a preprocessor directives. We tell gcc that
a .S file is assembler with cpp and not C.
Fixes #26819
- - - - -
269c4087 by Simon Peyton Jones at 2026-02-01T19:38:10-05:00
Include current phase in the range for rule/unfoldings
This MR fixes a bad loop in the compiler: #26826.
The fix is to add (WAR2) to
Note [What is active in the RHS of a RULE or unfolding?]
in GHC.Core.Opt.Simplify.Utils
- - - - -
ddf1434f by Vladislav Zavialov at 2026-02-01T19:38:52-05:00
Refactor: merge HsMultilineString into HsString (#26860)
Before this patch, HsLit defined two separate constructors to represent
single-line and multi-line strings:
data HsLit x
...
| HsString (XHsString x) FastString
| HsMultilineString (XHsMultilineString x) FastString
I found this to be an unnecessary complication and an obstacle to unifying
HsLit with HsTyLit. Now we use HsString for both kinds of literals.
One user-facing change here is `ppr (HsString st s)` behaving differently for
single-line strings containing newlines:
x = "first line \
\asdf\n\
\second line"
Previously, the literal was fed to `ftext` with its newlines, producing an
ill-formed SDoc. This issue is now addressed by using `split` for both
single-line and multi-line strings:
vcat $ map text $ split '\n' (unpackFS src)
See the parser/should_fail/T26860ppr test.
In addition (and unrelatedly to the main payload of this patch),
drop the unused pmPprHsLit helper.
- - - - -
2b4f463c by Simon Peyton Jones at 2026-02-02T17:32:32+00:00
Remove exprIsCheap from doFloatFromRhs
See #26854 and Note [Float when expandable]
This patch simplifies the code, by removing an extra unnecessary test.
- - - - -
9db7f21f by Brandon Chinn at 2026-02-03T09:15:10-05:00
Refactor: make function patterns exhaustive
Also added missing (==) logic for:
* HsMultilineString
* HsInt{8,16,32}
* HsWord{8,16,32}
- - - - -
aa9c5e2c by Hécate Kleidukos at 2026-02-03T15:58:35-05:00
driver: Hide source paths at verbosity level 1 by default
- - - - -
c64cca1e by mangoiv at 2026-02-03T15:59:29-05:00
ExplicitLevelImports: check staging for types just like for values
Previously, imported types were entirely exempted from staging checks as
the implicit stage persistance assumed to be all imported types to be
well staged. ExplicitLevelImports' change specification, however, does
not do such an exemption. Thus we want to introduce such a check, just
like we have for values.
ExplicitLevelImports does not, however, talk about local names - from
its perspective, we could theoretically keep treating locally introduced
types specially - e.g. an ill-staged used in a quote would only emit a
warning, not an error. To allow for a potential future migration away
from such wrinkles as the staging check in notFound
(see Note [Out of scope might be a staging error]) we consistently do
the strict staging check that we also do for value if ExplicitLevelImports
is on.
Closes #26098
- - - - -
5f0dbeb6 by Simon Hengel at 2026-02-03T16:00:12-05:00
Use Haddock formatting in deprecation message of `initNameCache`
- - - - -
01ecb612 by Andreas Klebinger at 2026-02-04T09:56:25-05:00
testsuite: Explicitly use utf-8 encoding in rts-includes linter.
Not doing so caused failures on windows, as python failed to pick a
reasonable encoding even with locale set.
Fixes #26850
- - - - -
ea0d1317 by Zubin Duggal at 2026-02-04T09:57:06-05:00
Bump transformers submodule to 0.6.3.0
Fixes #26790
- - - - -
cbe4300e by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix subtle bug in GHC.Core.Utils.mkTick
This patch fixes a decade-old bug in `mkTick`, which
could generate type-incorrect code! See the diagnosis
in #26772.
The new code is simpler and easier to understand.
(As #26772 says, I think it could be improved further.)
- - - - -
a193a8da by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Modify a debug-trace in the Simplifier
...just to show a bit more information.
- - - - -
b579dfdc by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix long-standing interaction between ticks and casts
The code for Note [Eliminate Identity Cases] was simply wrong when
ticks and casts interacted. This patch fixes the interaction.
It was shown up when validating #26772, although it's not the exactly
the bug that's reported by #26772. Nor is it easy to reproduce, hence
no regression test.
- - - - -
fac0de1e by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump Cabal submodule to 3.16.1.0
- - - - -
00589122 by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump deepseq submodule to 1.5.2.0
Also:
- Get rid of usage of deprecated `NFData` function instance in the
compiler
- `T21391` still relies on `NFData` function instance, add
`-Wno-deprecations` for the time being.
- - - - -
84474c71 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump directory submodule to 1.3.10.1
- - - - -
1a9f4662 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump exceptions submodule to 0.10.12
- - - - -
2e39a340 by Peng Fan at 2026-02-07T03:42:01-05:00
NCG/LA64: adjust register usage to avoid src-register being clobbered
- - - - -
9faf1b35 by Teo Camarasu at 2026-02-07T03:42:43-05:00
ghc-internal: Delete unnecessary GHC.Internal.Data.Ix
This module merely re-exports GHC.Internal.Ix. It was copied from
`base` when `ghc-internal` was split, but there is no reason to have
this now. So, let's delete it.
Resolves #26848
- - - - -
d112b440 by Sven Tennie at 2026-02-07T10:47:56-05:00
Add cabal.project file to generate-ci
This fixes the HLS setup for our CI code generation script
(generate-ci).
The project file simply makes `generate-ci` of the cabal file
discoverable.
- - - - -
5339f6f0 by Andreas Klebinger at 2026-02-07T10:48:40-05:00
CI: Don't collapse test results.
This puts test output back into the primary test log instead of a
subsection removing the need to expand a section to see test results.
While the intention was good in practice the old behaviour mostly wastes time
by requiring expansion of the section.
Fixes #26882
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0e1cd2e0 by Evan Piro at 2026-02-08T10:35:16-08:00
Linker.MacOS reduce dynflags import
- - - - -
1c79a4cd by Michael Alan Dorman at 2026-02-09T08:11:51-05:00
Remove `extra_src_files` variable from `testsuite/driver/testlib.py`
While reading through the test harness code, I noticed this variable
with a TODO attached that referenced #12223. Although that bug is
closed, it strongly implied that this special-case variable that only
affected a single test was expected to be removed at some point.
I also looked at 3415bcaa0b1903b5e12dfaadb5b774718e406eab---where it
was added---whose commit message suggested that it would have been
desirable to remove it, but that there were special circumstances that
meant it had to remain (though it doesn't elucidate what those special
circumstances are).
However, the special circumstances were mentioned as if the test was
in a different location than is currently is, so I decided to try
changing the test to use the standard `extra_files` mechanism, which
works in local testing.
This also seems like a reasonable time to remove the script that was
originally used in the transition, since it doesn't really serve a
purpose anymore.
- - - - -
0020e38a by Matthew Pickering at 2026-02-09T17:29:14-05:00
determinism: Use a stable sort in WithHsDocIdentifiers binary instance
`WithHsDocIdentifiers` is defined as
```
71 data WithHsDocIdentifiers a pass = WithHsDocIdentifiers
72 { hsDocString :: !a
73 , hsDocIdentifiers :: ![Located (IdP pass)]
74 }
```
This list of names is populated from `rnHsDocIdentifiers`, which calls
`lookupGRE`, which calls `lookupOccEnv_AllNameSpaces`, which calls
`nonDetEltsUFM` and returns the results in an order depending on
uniques.
Sorting the list with a stable sort before returning the interface makes
the output deterministic and follows the approach taken by other fields
in `Docs`.
Fixes #26858
- - - - -
89898ce6 by echoumcp1 at 2026-02-09T17:30:01-05:00
Replace putstrln with logMsg in handleSeqHValueStatus
Fixes #26549
- - - - -
7c52c4f9 by John Paul Adrian Glaubitz at 2026-02-10T13:52:43-05:00
rts: Switch prim to use modern atomic compiler builtins
The __sync_*() atomic compiler builtins have been deprecated in GCC
for a while now and also don't provide variants for 64-bit values
such as __sync_fetch_and_add_8().
Thus, replace them with the modern __atomic_*() compiler builtins and
while we're at it, also drop the helper macro CAS_NAND() which is now
no longer needed since we stopped using the __sync_*() compiler builtins
altogether.
Co-authored-by: Ilias Tsitsimpis <iliastsi(a)debian.org>
Fixes #26729
- - - - -
cf60850a by Recursion Ninja at 2026-02-10T13:53:27-05:00
Decoupling L.H.S.Decls from GHC.Types.ForeignCall
- Adding TTG extension point for 'CCallTarget'
- Adding TTG extension point for 'CType'
- Adding TTG extension point for 'Header'
- Moving ForeignCall types that do not need extension
to new L.H.S.Decls.Foreign module
- Replacing 'Bool' parameters with descriptive data-types
to increase clairty and prevent "Boolean Blindness"
- - - - -
11a04cbb by Eric Lee at 2026-02-11T09:20:46-05:00
Derive Semigroup/Monoid for instances believed could be derived in #25871
- - - - -
15d9ce44 by Eric Lee at 2026-02-11T09:20:46-05:00
add Ghc.Data.Pair deriving
- - - - -
c85dc170 by Evan Piro at 2026-02-11T09:21:45-05:00
Linker.MacOS reduce options import
- - - - -
a541dd83 by Chris Wendt at 2026-02-11T16:06:41-05:00
Initialize plugins for `:set +c` in GHCi
Fixes #23110.
- - - - -
0f5a73bc by Cheng Shao at 2026-02-11T16:07:27-05:00
compiler: add Binary Text instance
This patch adds `Binary` instance for strict `Text`, in preparation of
making `Text` usable in certain GHC API use cases (e.g. haddock). This
also introduces `text` as a direct dependency of the `ghc` package.
- - - - -
9e58b8a1 by Cheng Shao at 2026-02-11T16:08:10-05:00
ghc-toolchain: add C11 check
This patch partially reverts commit
b8307eab80c5809df5405d76c822bf86877f5960 that removed C99 check in
autoconf/ghc-toolchain. Now we:
- No longer re-implement `FP_SET_CFLAGS_C11` similar to
`FP_SET_CFLAGS_C99` in the past, since autoconf doesn't provide a
convenient `AC_PROG_CC_C11` function. ghc-toolchain will handle it
anyway.
- The Cmm CPP C99 check is relanded and repurposed for C11.
- The C99 logic in ghc-toolchain is relanded and repurposed for C11.
- The C99 check in Stg.h is corrected to check for C11. The obsolete
_ISOC99_SOURCE trick is dropped.
- Usages of `-std=gnu99` in the testsuite are corrected to use
`-std=gnu11`.
Closes #26908.
- - - - -
4df0adf6 by Simon Peyton Jones at 2026-02-11T21:50:13-05:00
Simplify the treatment of static forms
This MR implements GHC proposal 732: simplify static forms,
https://github.com/ghc-proposals/ghc-proposals/pull/732
thereby addressing #26556.
See `Note [Grand plan for static forms]` in GHC.Iface.Tidy.StaticPtrTable
The main changes are:
* There is a new, simple rule for (static e), namely that the free
term variables of `e` must be bound at top level. The check is
done in the `HsStatic` case of `GHC.Rename.Expr.rnExpr`
* That in turn substantially simplifies the info that the typechecker
carries around in its type environment. Hooray.
* The desugarer emits static bindings to top level directly; see the
`HsStatic` case of `dsExpr`.
* There is no longer any special static-related magic in the FloatOut
pass. And the main Simplifier pipeline no longer needs a special case
to run FloatOut even with -O0. Hooray.
All this forced an unexpected change to the pattern match checker. It
recursively invokes the main Hs desugarer when it wants to take a look
at a term to spot some special cases (notably constructor applications).
We don't want to emit any nested (static e) bindings to top level a
second time! Yikes.
That forced a modest refactor in GHC.HsToCore.Pmc:
* The `dsl_nablas` field of `DsLclEnv` now has a `NoPmc` case, which says
"I'm desugaring just for pattern-match checking purposes".
* When that flag is set we don't emit static binds.
That in turn forces a cascade of refactoring, but the net effect is an
improvement; less risk of duplicated (even exponential?) work.
See Note [Desugaring HsExpr during pattern-match checking].
10% metric decrease, on some architectures, of compile-time max-bytes-used on T15304.
Metric Decrease:
T15304
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7922f728 by Teo Camarasu at 2026-02-11T21:50:58-05:00
ghc-internal: avoid depending on GHC.Internal.Exts
This module is mostly just re-exports. It made sense as a user-facing
module, but there's no good reason ghc-internal modules should depend on
it and doing so linearises the module graph
- move considerAccessible to GHC.Internal.Magic
Previously it lived in GHC.Internal.Exts, but it really deserves to live
along with the other magic function, which are already re-exported from .Exts
- move maxTupleSize to GHC.Internal.Tuple
This previously lived in GHC.Internal.Exts but a comment already said it
should be moved to .Tuple
Resolves #26832
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b6a4a29b by Eric Lee at 2026-02-11T21:51:55-05:00
Remove unused Semigroup imports to fix GHC 9.14 bootstrapping
- - - - -
99d8c146 by Simon Peyton Jones at 2026-02-12T17:36:59+00:00
Fix subtle bug in cast worker/wrapper
See (CWw4) in Note [Cast worker/wrapper].
The true payload is in the change to the definition of
GHC.Types.Id.Info.hasInlineUnfolding
Everthing else is just documentation.
There is a 2% compile time decrease for T13056;
I'll take the win!
Metric Decrease:
T13056
- - - - -
530e8e58 by Simon Peyton Jones at 2026-02-12T20:17:23-05:00
Add regression tests for four StaticPtr bugs
Tickets #26545, #24464, #24773, #16981 are all solved by the
recently-landed MR
commit 318ee13bcffa6aa8df42ba442ccd92aa0f7e210c
Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com>
Date: Mon Oct 20 23:07:20 2025 +0100
Simplify the treatment of static forms
This MR just adds regression tests for them.
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4157160f by Cheng Shao at 2026-02-13T06:27:04-05:00
ci: remove unused hlint-ghc-and-base job definition
This patch removes the unused `hlint-ghc-and-base` job definition,
it's never run since !9806. Note that hadrian lint rules still work
locally, so anyone that wishes to run hlint on the codebase can
continue to do so in their local worktree.
- - - - -
039f1977 by Cheng Shao at 2026-02-13T06:27:47-05:00
wasm: use import.meta.main for proper distinction of nodejs main modules
This patch uses `import.meta.main` for proper distinction of nodejs
main modules, especially when the main module might be installed as a
symlink. Fixes #26916.
- - - - -
14f485ee by ARATA Mizuki at 2026-02-17T09:09:24+09:00
Support more x86 extensions: AVX-512 {BW,DQ,VL} and GFNI
Also, mark AVX-512 ER and PF as deprecated.
AVX-512 instructions can be used for certain 64-bit integer vector operations.
GFNI can be used to implement bitReverse (currently not used by NCG, but LLVM may use it).
Closes #26406
Addresses #26509
- - - - -
016f79d5 by fendor at 2026-02-17T09:16:16-05:00
Hide implementation details from base exception stack traces
Ensure we hide the implementation details of the exception throwing mechanisms:
* `undefined`
* `throwSTM`
* `throw`
* `throwIO`
* `error`
The `HasCallStackBacktrace` should always have a length of exactly 1,
not showing internal implementation details in the stack trace, as these
are vastly distracting to end users.
CLC proposal [#387](https://github.com/haskell/core-libraries-committee/issues/387)
- - - - -
4f2840f2 by Brian J. Cardiff at 2026-02-17T17:04:08-05:00
configure: Accept happy-2.2
In Jan 2026 happy-2.2 was released. The most sensible change is https://github.com/haskell/happy/issues/335 which didn't trigger in a fresh build
- - - - -
10b4d364 by Duncan Coutts at 2026-02-17T17:04:52-05:00
Fix errors in the documentation of the eventlog STOP_THREAD status codes
Fix the code for BlockedOnMsgThrowTo.
Document all the known historical warts.
Fixes issue #26867
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c5e15b8b by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: use snippets for all list examples
- generate snippet output for docs
- reduce font size to better fit snippets
- Use only directive to guard html snippets
- Add latex snippets for lists
- - - - -
d388bac1 by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: Place the snippet input and output together
- Put the output seemingly inside the example box
- - - - -
016fa306 by Samuel Thibault at 2026-02-18T05:08:35-05:00
Fix linking against libm by moving the -lm option
For those systems that need -lm for getting math functions, this is
currently added on the link line very early, before the object files being
linked together. Newer toolchains enable --as-needed by default, which means
-lm is ignored at that point because no object requires a math function
yet. With such toolchains, we thus have to add -lm after the objects, so the
linker actually includes libm in the link.
- - - - -
68bd0805 by Teo Camarasu at 2026-02-18T05:09:19-05:00
ghc-internal: Move GHC.Internal.Data.Bool to base
This is a tiny module that only defines bool :: Bool -> a -> a -> a. We can just move this to base and delete it from ghc-internal. If we want this functionality there we can just use a case statement or if-then expression.
Resolves 26865
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4c40df3d by fendor at 2026-02-20T10:24:48-05:00
Add optional `SrcLoc` to `StackAnnotation` class
`StackAnnotation`s give access to an optional `SrcLoc` field that
user-added stack annotations can use to provide better backtraces in both error
messages and when decoding the callstack.
We update builtin stack annotations such as `StringAnnotation` and
`ShowAnnotation` to also capture the `SrcLoc` of the current `CallStack`
to improve backtraces by default (if stack annotations are used).
This change is backwards compatible with GHC 9.14.1.
- - - - -
fd9aaa28 by Simon Hengel at 2026-02-20T10:25:33-05:00
docs: Fix grammar in explicit_namespaces.rst
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44354255 by Vo Minh Thu at 2026-02-20T18:53:06-05:00
GHCi: add a :version command.
This looks like:
ghci> :version
GHCi, version 9.11.20240322
This closes #24576.
Co-Author: Markus Läll <markus.l2ll(a)gmail.com>
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eab3dbba by Andreas Klebinger at 2026-02-20T18:53:51-05:00
hadrian/build-cabal: Better respect and utilize -j
* We now respect -j<n> for the cabal invocation to build hadrian rather
than hardcoding -j
* We use the --semaphore flag to ensure cabal/ghc build the hadrian
executable in parallel using the -jsem mechanism.
Saves 10-15s on fresh builds for me.
Fixes #26876
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17839248 by Teo Camarasu at 2026-02-24T08:36:03-05:00
ghc-internal: avoid depending on GHC.Internal.Control.Monad.Fix
This module contains the definition of MonadFix, since we want an
instance for IO, that instance requires a lot of machinery and we want
to avoid an orphan instance, this will naturally be quite high up in the
dependency graph.
So we want to avoid other modules depending on it as far as possible.
On Windows, the IO manager depends on the RTSFlags type, which
transtively depends on MonadFix. We refactor things to avoid this
dependency, which would have caused a regression.
Resolves #26875
Metric Decrease:
T12227
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fa88d09a by Wolfgang Jeltsch at 2026-02-24T08:36:47-05:00
Refine the imports of `System.IO.OS`
Commit 68bd08055594b8cbf6148a72d108786deb6c12a1 replaced the
`GHC.Internal.Data.Bool` import by a `GHC.Internal.Base` import.
However, while the `GHC.Internal.Data.Bool` import was conditional and
partial, the `GHC.Internal.Base` import is unconditional and total. As a
result, the import list is not tuned to import only the necessary bits
anymore, and furthermore GHC emits a lot of warnings about redundant
imports.
This commit makes the `GHC.Internal.Base` import conditional and partial
in the same way that the `GHC.Internal.Data.Bool` import was.
- - - - -
c951fef1 by Cheng Shao at 2026-02-25T20:58:28+00:00
wasm: add /assets endpoint to serve user-specified assets
This patch adds an `/assets` endpoint to the wasm dyld http server, so
that users can also fetch assets from the same host with sensible
default MIME types, without needing a separate http server for assets
that also introduces CORS headaches:
- A `-fghci-browser-assets-dir` driver flag is added to specify the
assets root directory (defaults to `$PWD`)
- The dyld http server fetches `mime-db` on demand and uses it as
source of truth for mime types.
Closes #26951.
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dde22f97 by Sylvain Henry at 2026-02-26T13:14:03-05:00
Fix -fcheck-prim-bounds for non constant args (#26958)
Previously we were only checking bounds for constant (literal)
arguments!
I've refactored the code to simplify the generation of out-of-line Cmm
code for the primop composed of some inline code + some call to an
external Cmm function.
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bd3eba86 by Vladislav Zavialov at 2026-02-27T05:48:01-05:00
Check for negative type literals in the type checker (#26861)
GHC disallows negative type literals (e.g., -1), as tested by T8306 and
T8412. This check is currently performed in the renamer:
rnHsTyLit tyLit@(HsNumTy x i) = do
when (i < 0) $
addErr $ TcRnNegativeNumTypeLiteral tyLit
However, this check can be bypassed using RequiredTypeArguments
(see the new test case T26861). Prior to this patch, such programs
caused the compiler to hang instead of reporting a proper error.
This patch addresses the issue by adding an equivalent check in
the type checker, namely in tcHsType.
The diff is deliberately minimal to facilitate backporting. A more
comprehensive rework of HsTyLit is planned for a separate commit.
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faf14e0c by Vladislav Zavialov at 2026-02-27T05:48:45-05:00
Consistent pretty-printing of HsString, HsIsString, HsStrTy
Factor out a helper to pretty-print string literals, thus fixing newline
handling for overloaded string literals and type literals.
Test cases: T26860ppr T26860ppr_overloaded T26860ppr_tylit
Follow up to ddf1434ff9bb08cfef3c93f23de6b83ec698aa27
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f108a972 by Arnaud Spiwack at 2026-02-27T12:53:01-05:00
Make list comprehension completely non-linear
Fixes #25081
From the note:
The usefulness of list comprehension in conjunction with linear types is dubious.
After all, statements are made to be run many times, for instance in
```haskell
[u | y <- [0,1], stmts]
```
both `u` and `stmts` are going to be run several times.
In principle, though, there are some position in a monad comprehension
expression which could be considered linear. We could try and make it so that
these positions are considered linear by the typechecker, but in practice the
desugarer doesn't take enough care to ensure that these are indeed desugared to
linear sites. We tried in the past, and it turned out that we'd miss a
desugaring corner case (#25772).
Until there's a demand for this very specific improvement, let's instead be
conservative, and consider list comprehension to be completely non-linear.
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ae799cab by Simon Jakobi at 2026-02-27T12:53:54-05:00
PmAltConSet: Use Data.Set instead of Data.Map
...to store `PmLit`s.
The Map was only used to map keys to themselves.
Changing the Map to a Set saves a Word of memory per entry.
Resolves #26756.
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dcd7819c by Vladislav Zavialov at 2026-02-27T18:46:03-05:00
Drop HsTyLit in favor of HsLit (#26862, #25121)
This patch is a small step towards unification of HsExpr and HsType,
taking care of literals (HsLit) and type literals (HsTyLit).
Additionally, it improves error messages for unsupported type literals,
such as unboxed or fractional literals (test cases: T26862, T26862_th).
Changes to the AST:
* Use HsLit where HsTyLit was previously used
* Use HsChar where HsCharTy was previously used
* Use HsString where HsStrTy was previously used
* Use HsNatural (NEW) where HsNumTy was previously used
* Use HsDouble (NEW) to represent unsupported fractional type literals
Changes to logic:
* Parse unboxed and fractional type literals (to be rejected later)
* Drop the check for negative literals in the renamer (rnHsTyLit)
in favor of checking in the type checker (tc_hs_lit_ty)
* Check for invalid type literals in TH (repTyLit) and report
unrepresentable literals with ThUnsupportedTyLit
* Allow negative type literals in TH (numTyLit). This is fine as
these will be taken care of at splice time (test case: T8306_th)
- - - - -
c927954f by Vladislav Zavialov at 2026-02-27T18:46:50-05:00
Increase test coverage of diagnostics
Add test cases for the previously untested diagnostics:
[GHC-01239] PsErrIfInFunAppExpr
[GHC-04807] PsErrProcInFunAppExpr
[GHC-08195] PsErrInvalidRecordCon
[GHC-16863] PsErrUnsupportedBoxedSumPat
[GHC-18910] PsErrSemiColonsInCondCmd
[GHC-24737] PsErrInvalidWhereBindInPatSynDecl
[GHC-25037] PsErrCaseInFunAppExpr
[GHC-25078] PsErrPrecedenceOutOfRange
[GHC-28021] PsErrRecordSyntaxInPatSynDecl
[GHC-35827] TcRnNonOverloadedSpecialisePragma
[GHC-40845] PsErrUnpackDataCon
[GHC-45106] PsErrInvalidInfixHole
[GHC-50396] PsErrInvalidRuleActivationMarker
[GHC-63930] MultiWayIfWithoutAlts
[GHC-65536] PsErrNoSingleWhereBindInPatSynDecl
[GHC-67630] PsErrMDoInFunAppExpr
[GHC-70526] PsErrLetCmdInFunAppCmd
[GHC-77808] PsErrDoCmdInFunAppCmd
[GHC-86934] ClassPE
[GHC-90355] PsErrLetInFunAppExpr
[GHC-91745] CasesExprWithoutAlts
[GHC-92971] PsErrCaseCmdInFunAppCmd
[GHC-95644] PsErrBangPatWithoutSpace
[GHC-97005] PsErrIfCmdInFunAppCmd
Remove unused error constructors:
[GHC-44524] PsErrExpectedHyphen
[GHC-91382] TcRnIllegalKindSignature
- - - - -
3a9470fd by Torsten Schmits at 2026-02-27T18:47:34-05:00
Avoid expensive computation for debug logging in `mergeDatabases` when log level is low
This computed and traversed a set intersection for every single
dependency unconditionally.
- - - - -
ea4c2cbd by Brandon Chinn at 2026-02-27T16:22:38-08:00
Implement QualifiedStrings (#26503)
See Note [Implementation of QualifiedStrings]
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08bc245b by sheaf at 2026-03-01T11:11:54-05:00
Clean up join points, casts & ticks
This commit shores up the logic dealing with casts and ticks occurring
in between a join point binding and a jump.
Fixes #26642 #26929 #26693
Makes progress on #14610 #26157 #26422
Changes:
- Remove 'GHC.Types.Tickish.TickishScoping' in favour of simpler
predicates 'tickishHasNoScope'/'tickishHasSoftScope', as things were
before commit 993975d3. This makes the code easier to read and
document (fewer indirections).
- Introduce 'canCollectArgsThroughTick' for consistent handling of
ticks around PrimOps and other 'Id's that cannot be eta-reduced.
See overhauled Note [Ticks and mandatory eta expansion].
- New Note [JoinId vs TailCallInfo] in GHC.Core.SimpleOpt that explains
robustness of JoinId vs fragility of TailCallInfo.
- Allow casts/non-soft-scoped ticks to occur in between a join point
binder and a jump, but only in Core Prep.
See Note [Join points, casts, and ticks] and
Note [Join points, casts, and ticks... in Core Prep]
in GHC.Core.Opt.Simplify.Iteration.
Also update Core Lint to account for this.
See Note [Linting join points with casts or ticks] in GHC.Core.Lint.
- Update 'GHC.Core.Utils.mergeCaseAlts' to avoid pushing a cast in
between a join point binding and its jumps. This fixes #26642.
See the new (MC5) and (MC6) in Note [Merge Nested Cases].
- Update float out to properly handle source note ticks. They are now
properly floated out instead of being discarded.
This increases the number of ticks in certain tests with -g.
Test cases: T26642 and TrickyJoins.
Metric increase due to more source note ticks with -g:
-------------------------
Metric Increase:
libdir
size_hello_artifact
size_hello_unicode
-------------------------
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476c4cdf by Sean D. Gillespie at 2026-03-02T10:14:37-05:00
Add SIMD absolute value on x86 and LLVM
On x86, absolute value of 32 bits or less is implemented with
PABSB/PABSW/PABSD if SSSE3 is available. Otherwise, there is a fallback
for SSE2. For 64 bit integers it uses VPABSQ, required by AVX-512VL,
with fallbacks for SSE4.2 and SSE2.
There is no dedicated instruction for floating point absolute value on
x86, so it is simulated using bitwise AND.
Absolute value for signed integers and floats are implemented by the
"llvm.abs/llvm.fabs" standard library intrinsics. This implementation
uses MachOps constructors, unlike non-vector floating point absolute
value, which uses CallishMachOps.
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709448c0 by Sean D. Gillespie at 2026-03-02T10:14:46-05:00
Add SIMD floating point square root
On x86, this is implemented with the SQRTPS and SQRTPD instructions. On
LLVM, it uses the sqrt library intrinstic.
- - - - -
0deadf66 by Sean D. Gillespie at 2026-03-02T10:14:47-05:00
Improve error message for SIMD on aarch64
When encountering vector literals on aarch64, previously it would
throw:
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.15.20251219:
getRegister' (CmmLit:CmmVec):
Now it is more consistent with the other vector operations:
<no location info>: error:
sorry! (unimplemented feature or known bug)
GHC version 9.15.20251219:
SIMD operations on AArch64 currently require the LLVM backend
- - - - -
7d64031b by Vladislav Zavialov at 2026-03-03T11:09:28-05:00
Replace maybeAddSpace with spaceIfSingleQuote
Simplify pretty-printing of HsTypes by using spaceIfSingleQuote.
This allows us to drop the unwieldy lhsTypeHasLeadingPromotionQuote
helper function.
Follow-up to 178c1fd830c78377ef5d338406a41e1d8eb5f0da
- - - - -
598db847 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Correct `hIsReadable` and `hIsWritable` for duplex handles
This contribution implements CLC proposal #371. It changes `hIsReadable`
and `hIsWritable` such that they always throw a respective exception
when encountering a closed or semi-closed handle, not just in the case
of a file handle.
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b90201e5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Document `SemiClosedHandle`
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c9df72b5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Tell users what “semi-closed” means for duplex handles
- - - - -
a8aa1868 by Ilias Tsitsimpis at 2026-03-06T06:26:29-05:00
Fix determinism of linker arguments
The switch from Data.Map to UniqMap in 3b5be05ac29 introduced
non-determinism in the order of packages passed to the linker.
This resulted in non-reproducible builds where the DT_NEEDED entries in
dynamic libraries were ordered differently across builds.
Fix the regression by explicitly sorting the package list derived from
UniqMap.
Fixes #26838
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9b64ad3a by Matthew Pickering at 2026-03-06T06:27:16-05:00
determinism: Use a deterministic renaming when writing bytecode files
Now when writing the bytecode file, a counter and substitution are used
to provide deterministic keys to local variables (rather than relying on
uniques). This change ensures that `.gbc` are produced
deterministically.
Fixes #26499
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d29800e0 by Teo Camarasu at 2026-03-06T06:28:46-05:00
ghc-internal: delete Version hs-boot loop
Version has a Read instance which needs Unicode but part of the Unicode interface is the unicode version. This is easy to resolve. We simply don't re-export the version from the Unicode module.
Resolves #26940
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ad25af90 by Sylvain Henry at 2026-03-06T06:30:33-05:00
Linker: implement support for COMMON symbols (#6107)
Add some support for COMMON symbols. We don't support common symbols
having different sizes where the larger one is allocated after the
smaller one. The linker will fail with an appropriate error message if
it happens.
- - - - -
3b59f158 by Cheng Shao at 2026-03-06T06:31:16-05:00
compiler: fix redundant import of GHC.Hs.Lit
This patch removes a redundant import of `GHC.Hs.Lit` which causes a
ghc build failure with validate flavours when bootstrapping from 9.14.
Fixes #26972.
- - - - -
148d36f3 by Cheng Shao at 2026-03-06T06:32:01-05:00
compiler: avoid unneeded traversals in GHC.Unit.State
Following !15591, this patch avoids unneeded traversals in
`reportCycles`/`reportUnusable` when log verbosity is below given
threshold. Also applies `logVerbAtLeast` when appropriate.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
7e31367c by Cheng Shao at 2026-03-06T06:32:46-05:00
ghc-internal: fix redundant import in GHC.Internal.Event.Windows.ManagedThreadPool
This patch fixes redundant import in
`GHC.Internal.Event.Windows.ManagedThreadPool` that causes a
compilation error when building windows target with validate flavours
and bootstrapping from 9.14. Fixes #26976.
- - - - -
fc8b8e27 by sheaf at 2026-03-06T06:33:28-05:00
System.Info.fullCompilerVersion: add 'since' annot
Fixes #26973
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c8238375 by Sylvain Henry at 2026-03-06T06:34:23-05:00
Hadrian: deprecate --bignum and automatically enable +native_bignum for JS
Deprecate --bignum=... to select the bignum backend. It's only used to
select the native backend, and this can be done with the +native_bignum
flavour transformer.
Additionally, we automatically enable +native_bignum for the JS target
because the GMP backend isn't supported.
- - - - -
a3ac7074 by Sylvain Henry at 2026-03-06T06:35:17-05:00
JS: fix putEnum/fromEnum (#24593)
Don't go through Word16 when serializing Enums.
- - - - -
0b36e96c by Andreas Klebinger at 2026-03-06T06:35:58-05:00
Docs: Document -fworker-wrapper-cbv default setting.
Fixes #26841
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eca445e7 by mangoiv at 2026-03-07T05:02:36-05:00
drop deb9/10 from CI, add deb13
debian 9 and 10 are end of life, hence we drop them
from our CI, but we do add debian 13. Jobs that were
previously run on 9 and 10 run on 13, too, jobs that
were run on 10, are run on 11 now. Jobs that were
previously run on debian 12 are run on debian 13 now.
This MR also updates hadrian's bootstrap plans for that
reason.
Metric Decrease:
T9872d
- - - - -
12f8b829 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Fix GHC.Internal.Prim haddock
Haddock used to parse Haskell source to generate documentation,
but switched to using interface files instead. This broke documentation
of the GHC.Internal.Prim module, since it's a wired-in interface that
didn't provide a document structure.
This patch adds the missing document structure and updates genprimopcode
to make the section headers and descriptions available.
fixes #26954
- - - - -
f87e5e57 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Remove obsolete --make-haskell-source from genprimopcode
Now that haddock uses the wired-in interface for GHC.Internal.Prim,
the generated Haskell source file is no longer needed. Remove the
--make-haskell-source code generator from genprimopcode and replace
the generated GHC/Internal/Prim.hs with a minimal static source file.
- - - - -
4a7ddc7b by Sylvain Henry at 2026-03-07T05:04:59-05:00
JS: fix linking of exposed but non-preload units (#24886)
Units exposed in the unit database but not explicitly passed on the
command-line were not considered by the JS linker. This isn't an issue
for cabal which passes every unit explicitly but it is an issue when
using GHC directly (cf T24886 test).
- - - - -
689aafcd by mangoiv at 2026-03-07T05:05:52-05:00
testsuite: double foundation timeout multiplier
The runtime timeout in the foundation test was regularly hit by code
generated by the wasm backend - we increase the timout since the high
runtime is expected on the wasm backend for this rather complex test.
Resolves #26938
- - - - -
a46a1bb1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: add myCapabilityExpr to GHC.Cmm.Utils
This commit adds `myCapabilityExpr` to `GHC.Cmm.Utils` which is
computed from `BaseReg`. It's convenient for codegen logic where one
needs to pass the current Capability's pointer.
- - - - -
4afc65b1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: lower tryPutMVar# into a ccall directly
This patch addresses an old TODO of `stg_tryPutMVarzh` by removing it
completely and making the compiler lower `tryPutMVar#` into a ccall to
`performTryPutMVar` directly, without landing into an intermediate C
or Cmm function. `performTryPutMVar` is promoted to a public RTS
function with default visibility, and the compiler lowering logic
takes into account the C ABI of `performTryPutMVar` and converts from
C Bool to primop's `Int#` result properly.
- - - - -
9e3d6a58 by Simon Hengel at 2026-03-09T04:51:15-04:00
Don't use #line in haddocks
This confuses the parser. Haddock output is unaffected by this change.
(read: this still produces the same documentation)
- - - - -
f4e8fec2 by Wolfgang Jeltsch at 2026-03-09T04:52:01-04:00
Remove in-package dependencies on `GHC.Internal.System.IO`
This contribution eliminates all dependencies on
`GHC.Internal.System.IO` from within `ghc-internal`. It comprises the
following changes:
* Make `GHC.Internal.Fingerprint` independent of I/O support
* Tighten the dependencies of `GHC.Internal.Data.Version`
* Tighten the dependencies of `GHC.Internal.TH.Monad`
* Tighten the dependencies of `GHCi.Helpers`
* Move some code that needs `System.IO` to `template-haskell`
* Move the `GHC.ResponseFile` implementation into `base`
* Move the `System.Exit` implementation into `base`
* Move the `System.IO.OS` implementation into `base`
Metric Decrease:
size_hello_artifact
size_hello_artifact_gzip
size_hello_unicode
size_hello_unicode_gzip
- - - - -
91df4c82 by Sylvain Henry at 2026-03-09T04:53:20-04:00
T18832: fix Windows CI failure by dropping removeDirectoryRecursive
On Windows, open file handles prevent deletion. After killThread, the
closer thread may not have called hClose yet, causing removeDirectoryRecursive
to fail with "permission denied". The test harness cleans up the run
directory anyway, so the call is redundant.
- - - - -
d7fe9671 by Cheng Shao at 2026-03-09T04:54:04-04:00
compiler: fix redundant import in GHC.StgToJS.Object
This patch fixes a redundant import in GHC.StgToJS.Object that causes
a build failure when compiling head from 9.14 with validate flavours.
Fixes #26991.
- - - - -
0bfd29c3 by Cheng Shao at 2026-03-09T04:54:46-04:00
wasm: fix `Illegal foreign declaration` failure when ghci loads modules with JSFFI exports
This patch fixes a wasm ghci error when loading modules with JSFFI
exports; the `backendValidityOfCExport` check in `tcCheckFEType`
should only makes sense and should be performed when not checking the
JavaScript calling convention; otherwise, when the calling convention
is JavaScript, the codegen logic should be trusted to backends that
actually make use of it. Fixes #26998.
- - - - -
e659610c by Duncan Coutts at 2026-03-09T12:08:35-04:00
Apply NOINLINE pragmas to generated Typeable bindings
For context, see the existing Note [Grand plan for Typeable]
and the Note [NOINLINE on generated Typeable bindings] added in the
subsequent commit.
This is about reducing the number of exported top level names and
unfoldings, which reduces interface file sizes and reduces the number of
global/dynamic linker symbols.
Also accept the changed test output and metric decreases.
Tests that record the phase output for type checking or for simplifier
end up with different output: the generated bindings now have an
Inline [~] annotation, and many top level names are now local rather
than module-prefixed for export.
Also accept the numerous metric decreases in compile_time/bytes
allocated, and a few in compile_time/max_bytes_used.
There's also one instance of a decrease in runtime/max_bytes_used but
it's a ghci-way test and so presumably the reason is that it loads
smaller .hi files and/or links fewer symbols.
-------------------------
Metric Decrease:
CoOpt_Singletons
MultiLayerModulesTH_OneShot
MultilineStringsPerf
T10421
T10547
T12150
T12227
T12234
T12425
T13035
T13056
T13253
T13253-spj
T15304
T15703
T16875
T17836b
T17977b
T18140
T18223
T18282
T18304
T18698a
T18698b
T18730
T18923
T20049
T21839c
T24471
T24582
T24984
T3064
T4029
T5030
T5642
T5837
T6048
T9020
T9198
T9961
TcPlugin_RewritePerf
WWRec
hard_hole_fits
mhu-perf
-------------------------
- - - - -
67df5161 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Add documentation Note [NOINLINE on generated Typeable bindings]
and refer to it from the code and existing documentation.
- - - - -
c4ad6167 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Switch existing note to "named wrinkle" style, (GPT1)..(GPT7)
GPT = Grand plan for Typeable
- - - - -
dc84f8e2 by Cheng Shao at 2026-03-09T12:09:21-04:00
ci: only build deb13 for validate pipeline aarch64-linux jobs
This patch drops the redundant aarch64-linux deb12 job from validate pipelines
and only keeps deb13; it's still built in nightly/release pipelines. Closes #27004.
- - - - -
23a50772 by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00
chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad
Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to
GHC.Internal.TH.Monad and delete the Quote module.
Update submodule template-haskell-quasiquoter to use the merged
upstream version that imports from the correct module.
Co-authored-by: Cursor <cursoragent(a)cursor.com>
- - - - -
a2bb6fc3 by Simon Jakobi at 2026-03-10T14:12:23-04:00
Add regression test for #16122
- - - - -
604e1180 by Cheng Shao at 2026-03-11T15:00:42-04:00
hadrian: remove the broken bench flavour
This patch removes the bench flavour from hadrian which has been
broken for years and not used for actual benchmarking (for which
`perf`/`release` is used instead). Closes #26825.
- - - - -
c3e64915 by Simon Jakobi at 2026-03-11T15:01:31-04:00
Add regression test for #18186
The original TypeInType language extension is replaced with
DataKinds+PolyKinds for compatibility.
Closes #18186.
- - - - -
664996c7 by Andreas Klebinger at 2026-03-11T15:02:16-04:00
Bump nofib submodule.
We accrued a number of nofib fixes we want to have here.
- - - - -
517cf64e by Simon Jakobi at 2026-03-11T15:03:03-04:00
Add regression test for #15907
Closes #15907.
- - - - -
fff362cf by Simon Jakobi at 2026-03-11T15:03:49-04:00
Ensure T14272 is run in optasm way
Closes #16539.
- - - - -
ec81ec2c by Simon Jakobi at 2026-03-11T15:03:49-04:00
Add regression test for #24632
Closes #24632.
- - - - -
cefec47b by Simon Jakobi at 2026-03-11T15:03:50-04:00
Fix module name of T9675: T6975 -> T9675
- - - - -
d3690ae8 by Andreas Klebinger at 2026-03-11T15:04:31-04:00
User guide: Clarify phase control on INLINEABLE[foo] pragmas.
Fixes #26851
- - - - -
e7054934 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12694
Closes #12694.
- - - - -
4756d9f6 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #16275
Closes #16275.
- - - - -
34b7e2c1 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14908
Closes #14908.
- - - - -
4243db3d by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14151
Closes #14151.
- - - - -
0e9f1453 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12640
Closes #12640.
- - - - -
ae606c7f by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #15588
Closes #15588.
- - - - -
5a38ce4e by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #9445
Closes #9445.
- - - - -
d054b467 by Cheng Shao at 2026-03-11T15:05:59-04:00
compiler: implement string interning logic for BCONPtrFS
This patch adds a `FastStringEnv`-based cache of `MallocStrings`
requests to `Interp`, so that when we load bytecode with many
breakpoints that share the same module names & unit ids, we reuse the
allocated remote pointers instead of issuing duplicte `MallocStrings`
requests and bloating the C heap. Closes #26995.
- - - - -
b85a0293 by Simon Jakobi at 2026-03-11T15:06:41-04:00
Add perf test for #1216
Closes #1216.
- - - - -
cd7f7420 by Sylvain Henry at 2026-03-11T15:07:58-04:00
JS: check that tuple constructors are linked (#23709)
Test js-mk_tup was failing before because tuple constructors weren't
linked in. It's no longer an issue after the linker fixes.
- - - - -
d57f01a4 by Matthew Pickering at 2026-03-11T15:08:40-04:00
testsuite: Add test for foreign import prim with unboxed tuple return
This commit just adds a test that foreign import prim works with unboxed
sums.
- - - - -
23d111ce by Matthew Pickering at 2026-03-11T15:08:41-04:00
Return a valid pointer in advanceStackFrameLocationzh
When there is no next stack chunk, `advanceStackFrameLocationzh` used to
return NULL in the pointer-typed StackSnapshot# result slot.
Even though the caller treats that case as "no next frame", the result is
still materialized in a GC-visible pointer slot. If a GC observes the raw
NULL there, stack decoding can crash.
Fix this by ensuring the dead pointer slot contains a valid closure
pointer. Also make the optional result explicit by returning an unboxed
sum instead of a tuple with a separate tag.
Fixes #27009
- - - - -
4c58a3ae by Cheng Shao at 2026-03-11T15:09:22-04:00
hadrian: build profiled dynamic objects with -dynamic-too
This patch enables hadrian to build profiled dynamic objects with
`-dynamic-too`, addressing a build parallelism bottleneck in release
pipelines. Closes #27010.
- - - - -
870243e4 by Zubin Duggal at 2026-03-12T17:33:28+05:30
DmdAnal: Take stable unfoldings into account when determining argument demands
Previously, demand analysis only looked at the RHS to compute argument demands.
If the optimised RHS discarded uses of an argument that the stable unfolding
still needed, it would be incorrectly marked absent. Worker/wrapper would then
replace it with LitRubbish, and inlining the stable unfolding would use the
rubbish value, causing a segfault.
To fix, we introduce addUnfoldingDemands which analyses the stable unfolding
with dmdAnal and combines its DmdType with the RHS's via the new `maxDmdType`
which combines the demands of the stable unfolding with the rhs, so we can avoid
any situation where we give an absent demand to something which is still used
by the stable unfolding.
Fixes #26416.
- - - - -
669d09f9 by Cheng Shao at 2026-03-13T15:06:07-04:00
hadrian: remove redundant library/rts ways definitions from stock flavours
This patch removes redundant library/rts ways definitions from stock
flavours in hadrian; they can be replaced by applying appropriate
filters on `defaultFlavour`.
- - - - -
a27dc081 by Teo Camarasu at 2026-03-13T15:06:51-04:00
ghc-internal: move bits Weak of finalizer interface to base
We move parts of the Weak finalizer interface to `base` only the parts
that the RTS needs to know about are kept in `ghc-internal`.
This lets us then prune our imports somewhat and get rid of some SOURCE imports.
Resolves #26985
- - - - -
6eef855b by Sylvain Henry at 2026-03-13T15:08:18-04:00
Stg/Unarise: constant-folding during unarisation (#25650)
When building an unboxed sum from a literal argument, mkUbxSum
previously emitted a runtime cast via `case primop [lit] of var -> ...`.
This wrapper prevented GHC from recognising the result as a static
StgRhsCon, causing top-level closures to be allocated as thunks instead
of being statically allocated.
Fix: try to perform the numeric literal cast at compile time using
mkLitNumberWrap (wrapping semantics). If successful, return the cast
literal directly with an identity wrapper (no case expression). The
runtime cast path is kept as fallback for non-literal arguments.
Test: codeGen/should_compile/T25650
- - - - -
905f8723 by Simon Jakobi at 2026-03-13T15:09:09-04:00
Add regression test for #2057
Test that GHC stops after an interface-file error instead of
continuing into the linker.
The test constructs a stale package dependency on purpose. `pkgB` is compiled
against one version of package `A`, then the same unit id is replaced by an
incompatible build of `A`. When `Main` imports `B`, GHC has to read `B.hi`,
finds an unfolding that still mentions the old `A`, and should fail while
loading interfaces.
Closes #2057.
Assisted-by: Codex
- - - - -
a13245a9 by Sylvain Henry at 2026-03-13T15:10:06-04:00
JS: fix recompilation avoidance (#23013)
- we were checking the mtime of the *.jsexe directory, not of a file
- we were not computing the PkgsLoaded at all
- - - - -
07442653 by Cheng Shao at 2026-03-13T15:10:51-04:00
hadrian: bump index state & bootstrap plans
This patch bumps hadrian index state & bootstrap plans:
- The updated index state allows bootstrapping from 9.14 without cabal
allow-newer hacks
- The updated bootstrap plans all contain shake-0.19.9 containing
important bugfix, allowing a subsequent patch to bump shake bound to
ensure the bugfix is included
- ghc 9.14.1 bootstrap plan is added
- - - - -
fdc1dbad by Cheng Shao at 2026-03-13T15:10:51-04:00
ci: add ghc 9.14.1 to bootstrap matrix
This patch adds ghc 9.14.1 to bootstrap matrix, so that we test
bootstrapping from ghc 9.14.1.
- - - - -
91916079 by Sylvain Henry at 2026-03-13T15:11:43-04:00
T17912: wait for opener thread to block before killing it (#24739)
Instead of a fixed 1000ms delay, poll threadStatus until the opener
thread is in BlockedOnForeignCall, ensuring killThread only fires once
the thread is provably inside the blocking open() syscall. This prevents
the test from accidentally passing on Windows due to scheduling races.
- - - - -
baa4ebb4 by Cheng Shao at 2026-03-13T15:12:26-04:00
template-haskell: fix redundant import in Language.Haskell.TH.Quote
This patch fixes a redundant import in `Language.Haskell.TH.Quote`
that causes a ghc build failure when bootstrapping from 9.14 with
validate flavours. Fixes #27014.
- - - - -
02e68a86 by Brandon Simmons at 2026-03-13T15:13:19-04:00
Add a cumulative gc_sync_elapsed_ns counter to GHC.Internal.Stats
This makes it possible to get an accurate view of time spent in sync
phase when using prometheus-style sampling. Previously this was only
available for the most recent GC.
This intentionally leaves GHC.Stats API unchanged since it is marked as
deprecated, and API changes there require CLC approval.
Fixes #26944
- - - - -
a18fa3c1 by Cheng Shao at 2026-03-14T05:12:14-04:00
configure: make $LLVMAS default to $CC when $CcLlvmBackend is YES
This patch changes the $LLVMAS detection logic in configure so that
when it's not manually specified by the user, it defaults to $CC if
$CcLlvmBackend is YES. It's a more sensible default than auto-detected
clang from the environment, especially when cross-compiling, $CC as
the cross target's LLVM assembler is more compatible with the use case
than the system-wide clang. Fixes #26769.
- - - - -
3774086e by Matthew Pickering at 2026-03-14T05:13:00-04:00
exceptions: annotate onException continuation with WhileHandling
Before this patch, an exception thrown in the `onException` handler
would loose track of where the original exception was thrown.
```
import Control.Exception
main :: IO ()
main = failingAction `onException` failingCleanup
where
failingAction = throwIO (ErrorCall "outer failure")
failingCleanup = throwIO (ErrorCall "cleanup failure")
```
would report
```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
cleanup failure
HasCallStack backtrace:
throwIO, called at T28399.hs:<line>:<column> in <package-id>:Main
```
notice that the "outer failure" exception is not present in the error
message.
With this patch, any exception thrown is in the handler is annotated
with WhileHandling. The resulting message looks like
```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
cleanup failure
While handling outer failure
HasCallStack backtrace:
throwIO, called at T28399.hs:7:22 in main:Main
```
CLC Proposal: https://github.com/haskell/core-libraries-committee/issues/397
Fixes #26759
- - - - -
63ae8eb3 by Andreas Klebinger at 2026-03-14T05:13:43-04:00
Fix missing profiling header for origin_thunk frame.
Fixes #27007
- - - - -
213d2c0e by Cheng Shao at 2026-03-14T05:14:28-04:00
ci: fix ci-images revision
The current ci-images revision was a commit on the WIP branch of
https://gitlab.haskell.org/ghc/ci-images/-/merge_requests/183, and
it's not on the current ci-images master branch. This patch fixes the
image revision to use the current tip of ci-images master.
- - - - -
fc2b083f by Andreas Klebinger at 2026-03-14T05:15:14-04:00
Revert "hadrian/build-cabal: Better respect and utilize -j"
This reverts commit eab3dbba79650e6046efca79133b4c0a5257613d.
While it's neat this currently isn't well supported on all platforms.
It's time will come, but for now I'm reverting this to avoid issues for
users on slightly unconvential platforms.
This will be tracked at #26977.
- - - - -
12a706cf by Cheng Shao at 2026-03-14T16:37:54-04:00
base: fix redundant imports in GHC.Internal.Weak.Finalize
This patch fixes redundant imports in GHC.Internal.Weak.Finalize that
causes a regression in bootstrapping head from 9.14 with validate
flavours. Fixes #27026.
- - - - -
b5d39cad by Matthew Pickering at 2026-03-14T16:38:37-04:00
Use explicit syntax rather than pure
- - - - -
43638643 by Andreas Klebinger at 2026-03-15T18:15:48-04:00
Configure: Fix check for --target support in stage0 CC
The check FP_PROG_CC_LINKER_TARGET used $CC unconditionally to check for
--target support. However this fails for the stage0 config where the C
compiler used is not $CC but $CC_STAGE0.
Since we already pass the compiler under test into the macro I simply
changed it to use that instead.
Fixes #26999
- - - - -
18fd0df6 by Simon Hengel at 2026-03-15T18:16:33-04:00
Fix typo in recursive_do.rst
- - - - -
86bd9bfc by fendor at 2026-03-17T23:46:09-04:00
Introduce `-fimport-loaded-targets` GHCi flag
This new flag automatically adds all loaded targets to the GHCi session
by adding an `InteractiveImport` for the loaded targets.
By default, this flag is disabled, as it potentially increases memory-usage.
This interacts with the flag `-fno-load-initial-targets` as follows:
* If no module is loaded, no module is added as an interactive import.
* If a reload loads up to a module, all loaded modules are added as
interactive imports.
* Unloading modules removes them from the interactive context.
Fixes #26866 by rendering the use of a `-ghci-script` to achieve the
same thing redundant.
- - - - -
e3d4c1bb by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Remove GHC.Internal.Data.Eq
It served no purpose other than being a re-export.
- - - - -
6f4f6cf0 by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Refine GHC.Internal.Base imports
Removed re-exports from GHC.Internal.Base. This reveals some modules
that don't actually use anything *defined* in GHC.Internal.Base, and
that can be pushed down a little in the import graph.
Replaced most imports of GHC.Internal.Base with non-wildcard imports
from modules where the identifiers are actually defined.
Part of #26834
Metric Decrease:
T5321FD
- - - - -
7fb51f54 by mangoiv at 2026-03-17T23:48:00-04:00
ci: clone, don't copy when creating the cabal cache
Also removed WINDOWS_HOST variable detected via uname - we now just
check whether the CI job has windows in its name. This works because we
only ever care about it if the respective job is not a cross job. We
also statically detect darwin cross jobs in the same way. We only ever have
darwin -> darwin cross jobs so this is enough to detect the host
reliably.
- - - - -
f8817879 by mangoiv at 2026-03-17T23:48:44-04:00
ci: mark size_hello_artifact fragile on darwin x86
The size of the x86_64 hello artifact is not stable which results in flaky testruns.
Resolves #26814
- - - - -
e34cb6da by Adam Gundry at 2026-03-20T12:20:00-04:00
ghci: Mention active language edition in startup banner
Per GHC proposal 632, this makes the GHCi startup banner include
the active language edition, plus an indication of whether this
was the default (as opposed to being explicitly selected via an
option such as `-XGHC2024`). For example:
```
$ ghci
GHCi, version 9.14.1: https://www.haskell.org/ghc/ :? for help
Using default language edition: GHC2024
ghci>
```
Fixes #26037.
- - - - -
52c3e6ba by sheaf at 2026-03-20T12:21:09-04:00
Improve incomplete record selector warnings
This commit stops GHC from emitting spurious incomplete record selector
warnings for bare selectors/projections such as .fld
There are two places we currently emit incomplete record selector
warnings:
1. In the desugarer, when we see a record selector or an occurrence
of 'getField'. Here, we can use pattern matching information to
ensure we don't give false positives.
2. In the typechecker, which might sometimes give false positives but
can emit warnings in cases that the pattern match checker would
otherwise miss.
This is explained in Note [Detecting incomplete record selectors]
in GHC.HsToCore.Pmc.
Now, we obviously don't want to emit the same error twice, and generally
we prefer (1), as those messages contain fewer false positives. So we
suppress (2) when we are sure we are going to emit (1); the logic for
doing so is in GHC.Tc.Instance.Class.warnIncompleteRecSel,
and works by looking at the CtOrigin.
Now, the issue was that this logic handled explicit record selectors as
well as overloaded record field selectors such as "x.r" (which turns
into a simple GetFieldOrigin CtOrigin), but it didn't properly handle
record projectors like ".fld" or ".fld1.fld2" (which result in other
CtOrigins such as 'RecordFieldProjectionOrigin').
To solve this problem, we re-use the 'isHasFieldOrigin' introduced in
fbdc623a (slightly adjusted).
On the way, we also had to update the desugarer with special handling
for the 'ExpandedThingTc' case in 'ds_app', to make sure that
'ds_app_var' sees all the type arguments to 'getField' in order for it
to indeed emit warnings like in (1).
Fixes #26686
- - - - -
309d7e87 by Cheng Shao at 2026-03-20T12:21:53-04:00
rts: opportunistically grow the MutableByteArray# in-place in resizeMutableByteArray#
Following !15234, this patch improves `resizeMutableByteArray#` memory
efficiency by growing the `MutableByteArray#` in-place if possible,
addressing an old todo comment here. Also adds a new test case
`resizeMutableByteArrayInPlace` that stresses this behavior.
- - - - -
7d4ef162 by Matthew Craven at 2026-03-20T12:22:47-04:00
Change representation of floating point literals
This commit changes the representation of floating point literals
throughough the compiler, in particular in Core and Cmm.
The Rational type is deficient for this purpose, dealing poorly
with NaN, +/-Infinity, and negative zero. Instead, the new module
GHC.Types.Literal.Floating uses the host Float/Double type to represent
NaNs, infinities and negative zero. It also contains a Rational
constructor, for the benefit of -fexcess-precision.
Other changes:
- Remove Note [negative zero] and related code
This also removes the restrictions on constant-folding of division
by zero, and should make any problems with NaN/Infinity more obvious.
- Use -0.0 as the additive identity for Core constant folding rules
for floating-point addition, fixing #21227.
- Manual worker-wrapper for GHC.Float.rationalToDouble. This is
intended to prevent the compiler's WW on this function from
interfering with constant-folding. This change means that we now
avoid allocating a box for the result of a 'realToFrac' call in
T10359.
- Combine floatDecodeOp and doubleDecodeOp.
This change also fixes a bug in doubleDecodeOp wherein it
would incorrectly produce an Int# instead of an Int64#
literal for the mantissa component with 64-bit targets.
- Use Float/Double for assembly immediates, and update the X86 and
PowerPC backends to properly handle special values such as NaN and
infinity.
- Allow 'rational_to' to handle zero denominators, fixing a
TODO in GHC.Core.Opt.ConstantFold.
Fixes #8364 #9811 #18897 #21227
Progress towards #26919
Metric Decrease:
T10359
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
-------------------------
Metric Decrease:
T1969
T5321FD
-------------------------
- - - - -
80e2dd4f by Zubin Duggal at 2026-03-20T12:23:33-04:00
compiler/ffi: Collapse void pointer chains in capi wrappers
New gcc/clang treat -Wincompatible-pointer-types as an error by
default. Since C only allows implicit conversion from void*, not void**,
capi wrappers for functions taking e.g. abstract** would fail to compile
when the Haskell type Ptr (Ptr Abstract) was naively translated to void**.
Collapse nested void pointers to a single void* when the pointee type
has no known C representation.
Fixes #26852
- - - - -
1c50bd7b by Luite Stegeman at 2026-03-20T12:24:37-04:00
Move some functions related to pointer tagging to a separate module
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bfd7aafd by Luite Stegeman at 2026-03-20T12:24:37-04:00
Branchless unpacking for enumeration types
Change unpacking for enumeration types to go to Word8#/Word16#/Word#
directly instead of going through an intermediate unboxed sum. This
allows us to do a branchless conversion using DataToTag and TagToEnum.
Fixes #26970
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72b20fc0 by Luite Stegeman at 2026-03-20T12:25:30-04:00
bytecode: Carefully SLIDE off the end of a stack chunk
The SLIDE bytecode instruction was not checking for stack chunk
boundaries and could corrupt the stack underflow frame, leading
to crashes.
We add a check to use safe writes if we cross the chunk boundary
and also handle stack underflow if Sp is advanced past the underflow
frame.
fix #27001
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2e22b43c by Cheng Shao at 2026-03-20T12:26:14-04:00
ghci: serialize BCOByteArray buffer directly when possible
This patch changes the `Binary` instances of `BCOByteArray` to
directly serialize the underlying buffer when possible, while also
taking into account the issue of host-dependent `Word` width. See
added comments and amended `Note [BCOByteArray serialization]` for
detailed explanation. Closes #27020.
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89d9ba37 by Sylvain Henry at 2026-03-20T12:27:34-04:00
JS: replace BigInt with Number arithmetic for 32/64-bit quot/rem (#23597)
Replace BigInt-based implementations of quotWord32, remWord32,
quotRemWord32, quotRem2Word32, quotWord64, remWord64, quotInt64, and
remInt64 with pure Number (double/integer) arithmetic to avoid the
overhead of BigInt promotion.
- - - - -
ae4ddd60 by Sylvain Henry at 2026-03-20T12:28:28-04:00
Core: add constant-folding rules for Addr# eq/ne (#18032)
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3e767f98 by Matthew Pickering at 2026-03-20T12:29:11-04:00
Use OsPath rather than FilePath in Downsweep cache
This gets us one step closure to uniformly using `OsPath` in the
compiler.
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2c57de29 by Cheng Shao at 2026-03-20T12:29:55-04:00
hadrian: fix ghc-in-ghci flavour stage0 shared libraries
This patch fixes missing stage0 shared libraries in hadrian
ghc-in-ghci flavour, which was accidentally dropped in
669d09f950a6e88b903d9fd8a7571531774d4d5d and resulted in a regression
in HLS support on linux/macos. Fixes #27057.
- - - - -
5b1be555 by Sylvain Henry at 2026-03-20T12:30:48-04:00
JS: install rts/Types.h header file (#27033)
It was an omission, making HsFFI.h not usable with GHC using the JS
backend.
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b883f08f by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: don't compile RTS with -Winline
This patch removes `-Winline` from cflags when compiling the RTS,
given that:
1. It generates a huge pile of spam and hurts developer experience
2. Whether inlining happens is highly dependent on toolchains,
flavours, etc, and it's not really an issue to fix if inlining
doesn't happen; it's a hint to the C compiler anyway.
Fixes #27060.
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333387d6 by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: compile libffi-clib with -Wno-deprecated-declarations
This patch adds `-Wno-deprecated-declarations` to cflags of
`libffi-clib`, given that it produces noise at compile-time that
aren't really our issue to fix anyway, it's from vendored libffi
source code.
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67c47771 by Rodrigo Mesquita at 2026-03-20T12:32:17-04:00
Expose decodeStackWithIpe from ghc-experimental
This decoding is useful to the debugger and it wasn't originally
exported as an oversight.
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18513365 by Matthew Pickering at 2026-03-21T04:43:26-04:00
Add support for custom external interpreter commands
It can be useful for GHC API clients to implement their own external
interpreter commands.
For example, the debugger may want an efficient way to inspect the
stacks of the running threads in the external interpreter.
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4636d906 by mangoiv at 2026-03-21T04:44:10-04:00
ci: remove obsolete fallback for old debian and ubuntu versions
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2e3a2805 by mangoiv at 2026-03-21T04:44:10-04:00
ci: drop ubuntu 18 and 20
Ubuntu 18 EOL: May 2023
Ubuntu 20 EOL: May 2025
We should probably not make another major release supporting these platforms.
Also updates the generator script.
Resolves #25876
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de54e264 by Cheng Shao at 2026-03-21T17:52:08+01:00
rts: fix -Wcompare-distinct-pointer-types errors
This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS
which should have been caught by the `validate` flavour but was
warnings in CI due to the recent `+werror` regression.
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b9bd73de by Cheng Shao at 2026-03-21T17:52:08+01:00
ghc-internal: fix unused imports
This commit fixes unused imports in `ghc-internal` which should have
been caught by the `validate` flavour but was warnings in CI due to
the recent `+werror` regression. Fixes #26987 #27059.
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da946a16 by Cheng Shao at 2026-03-21T17:03:51+00:00
ghci: fix unused imports
This commit fixes unused imports in `ghci` which should have been
caught by the `validate` flavour but was warnings in CI due to the
recent `+werror` regression. Fixes #26987 #27059.
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955b1cf8 by Cheng Shao at 2026-03-21T17:03:51+00:00
compiler: fix unused imports in GHC.Tc.Types.Origin
This commit fixes unused imports in `GHC.Tc.Types.Origin` which should
have been caught by the `validate` flavour but was warnings in CI due
to the recent `+werror` regression. Fixes #27059.
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3b1aeb50 by Cheng Shao at 2026-03-21T17:03:51+00:00
hadrian: fix missing +werror in validate flavour
This patch fixes missing `+werror` in validate flavour, which was an
oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066.
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44f118f0 by Cheng Shao at 2026-03-22T04:54:01-04:00
ci: bump CACHE_REV and add the missing reminder
This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI
errors due to stale cabal cache on some runners, and also adds a
reminder to remind future maintainers. Fixes #27075.
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2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
Add 128-bit SIMD support to AArch64 NCG
Changes:
- Add `Format` field to vector-capable instructions.
These instructions will emit `vN.4s` (for example) as a operand.
- Additional constructors for `Operand`:
`OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example).
`OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example).
- Integer quot/rem are implemented in C, like x86.
Closes #26536
Metric Increase:
T3294
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5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
AArch64 NCG: Improve code generation for floating-point and vector constants
Some floating-point constants can be directly encoded using the FMOV instruction.
Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI.
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c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00
Add regression test for #13729
Closes #13729.
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aa5dfe67 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Check that shift values are valid
In GHC's codebase in non-DEBUG builds we silently substitute shiftL/R
with unsafeShiftL/R for performance reasons. However we were not
checking that the shift value was valid for unsafeShiftL/R, leading to
wrong computations, but only in non-DEBUG builds.
This patch adds the necessary checks and reports an error when a wrong
shift value is passed.
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c8a7b588 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Implement basic value range analysis (#25718)
Perform basic value range analysis to try to determine at compile time
the result of the application of some comparison primops (ltWord#, etc.).
This subsumes the built-in rewrite rules used previously to check if one
of the comparison argument was a bound (e.g. (x :: Word8) <= 255 is
always True). Our analysis is more powerful and handles type
conversions: e.g. word8ToWord x <= 255 is now detected as always True too.
We also use value range analysis to filter unreachable alternatives in
case-expressions. To support this, we had to allow case-expressions for
primitive types to not have a DEFAULT alternative (as was assumed before
and checked in Core lint).
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a5ec467e by ARATA Mizuki at 2026-03-26T03:49:49-04:00
rts: Align stack to 64-byte boundary in StgRun on x86
When LLVM spills AVX/AVX-512 vector registers to the stack, it requires
32-byte (__m256) or 64-byte (__m512) alignment. If the stack is not
sufficiently aligned, LLVM inserts a realignment prologue that reserves
%rbp as a frame pointer, conflicting with GHC's use of %rbp as an STG
callee-saved register and breaking the tail-call-based calling convention.
Previously, GHC worked around this by lying to LLVM about the stack
alignment and rewriting aligned vector loads/stores (VMOVDQA, VMOVAPS)
to unaligned ones (VMOVDQU, VMOVUPS) in the LLVM Mangler. This had two
problems:
- It did not extend to AVX-512, which requires 64-byte alignment. (#26595)
- When Haskell calls a C function that takes __m256/__m512 arguments on
the stack, the callee requires genuine alignment, which could cause a
segfault. (#26822)
This patch genuinely aligns the stack to 64 bytes in StgRun by saving
the original stack pointer before alignment and restoring it in
StgReturn. We now unconditionally advertise 64-byte stack alignment to
LLVM for all x86 targets, making rewriteAVX in the LLVM Mangler
unnecessary. STG_RUN_STACK_FRAME_SIZE is increased from 48 to 56 bytes
on non-Windows x86-64 to store the saved stack pointer.
Closes #26595 and #26822
Co-Authored-By: Claude Opus 4.5 <noreply(a)anthropic.com>
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661da815 by Teo Camarasu at 2026-03-26T03:50:33-04:00
ghc-internal: Float Generics to near top of module graph
We remove GHC.Internal.Generics from the critical path of the
`ghc-internal` module graph. GHC.Internal.Generics used to be in the
middle of the module graph, but now it is nearer the top (built later).
This change thins out the module graph and allows us to get rid of the
ByteOrder hs-boot file.
We implement this by moving Generics instances from the module where the
datatype is defined to the GHC.Internal.Generics module. This trades off
increasing the compiled size of GHC.Internal.Generics with reducing the
dependency footprint of datatype modules.
Not all instances are moved to GHC.Internal.Generics. For instance,
`GHC.Internal.Control.Monad.Fix` keeps its instance as it is one of the
very last modules compiled in `ghc-internal` and so inverting the
relationship here would risk adding GHC.Internal.Generics back onto the
critical path.
We also don't change modules that are re-exported from the `template-haskell` or `ghc-heap`.
This is done to make it easy to eventually move `Generics` to `base`
once something like #26657 is implemented.
Resolves #26930
Metric Decrease:
T21839c
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45428f88 by sheaf at 2026-03-26T03:51:31-04:00
Avoid infinite loop in deep subsumption
This commit ensures we only unify after we recur in the deep subsumption
code in the FunTy vs non-FunTy case of GHC.Tc.Utils.Unify.tc_sub_type_deep,
to avoid falling into an infinite loop.
See the new Wrinkle [Avoiding a loop in tc_sub_type_deep] in
Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.
Fixes #26823
Co-authored-by: simonpj <simon.peytonjones(a)gmail.com>
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2823b039 by Ian Duncan at 2026-03-26T03:52:21-04:00
AArch64: fix MOVK regUsageOfInstr to mark dst as both read and written
MOVK (move with keep) modifies only a 16-bit slice of the destination
register, so the destination is both read and written. The register
allocator must know this to avoid clobbering live values. Update
regUsageOfInstr to list the destination in both src and dst sets.
No regression test: triggering the misallocation requires specific
register pressure around a MOVK sequence, which is difficult to
reliably provoke from Haskell source.
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57b7878d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12002
Closes #12002.
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c8f9df2d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12046
Closes #12046.
Co-authored-by: Andreas Klebinger <klebinger.andreas(a)gmx.at>
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615d72ac by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #13180
Closes #13180.
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423eebcf by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11141
Closes #11141.
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286849a4 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11505
Closes #11505.
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7db149d9 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression perf test for #13820
Closes #13820.
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e73c4adb by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #10381
Closes #10381.
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5ebcfb57 by Benjamin Maurer at 2026-03-26T03:54:02-04:00
Generate assembly on x86 for word2float (#22252)
We used to emit C function call for MO_UF_Conv primitive.
Now emits direct assembly instead.
Co-Authored-By: Sylvain Henry <sylvain(a)haskus.fr>
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
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5b550754 by Matthew Pickering at 2026-03-26T03:54:51-04:00
rts: forward clone-stack messages after TSO migration
MSG_CLONE_STACK assumed that the target TSO was still owned by the
capability that received the message. This is not always true: the TSO
can migrate before the inbox entry is handled.
When that happened, handleCloneStackMessage could clone a live stack from
the wrong capability and use the wrong capability for allocation and
performTryPutMVar, leading to stack sanity failures such as
checkStackFrame: weird activation record found on stack.
Fix this by passing the current capability into
handleCloneStackMessage, rechecking msg->tso->cap at handling time, and
forwarding the message if the TSO has migrated. Once ownership matches,
use the executing capability consistently for cloneStack, rts_apply, and
performTryPutMVar.
Fixes #27008
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ef0a1bd2 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: adopt release tracking ticket from #16816
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a7f40fd9 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: add a release tracking ticket
Brings the information in the release tracking ticket up to date with
https://gitlab.haskell.org/ghc/ghc-hq/-/blob/main/release-management.mkd
Resolves #26691
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161d3285 by Teo Camarasu at 2026-03-26T03:56:18-04:00
Revert "Set default eventlog-flush-interval to 5s"
Flushing the eventlog forces a synchronisation of all the capabilities
and there was a worry that this might lead to a performance cost for
some highly parallel workloads.
This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2.
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36eed985 by Cheng Shao at 2026-03-26T03:57:03-04:00
ghc-boot: move GHC.Data.SmallArray to ghc-boot
This commit moves `GHC.Data.SmallArray` from the `ghc` library to
`ghc-boot`, so that it can be used by `ghci` as well:
- The `Binary` (from `ghc`) instance of `SmallArray` is moved to
`GHC.Utils.Binary`
- Util functions `replicateSmallArrayIO`, `mapSmallArrayIO`,
`mapSmallArrayM_`, `imapSmallArrayM_` , `smallArrayFromList` and
`smallArrayToList` are added
- The `Show` instance is added
- The `Binary` (from `binary`) instance is added
- - - - -
fdf828ae by Cheng Shao at 2026-03-26T03:57:03-04:00
compiler: use `Binary` instance of `BCOByteArray` for bytecode objects
This commit defines `Binary` (from `compiler`) instance of
`BCOByteArray` which serializes the underlying buffer directly, and
uses it directly in bytecode object serialization. Previously we reuse
the `Binary` (from `binary`) instance, and this change allows us to
avoid double-copying via an intermediate `ByteString` when using
`put`/`get` in `binnary`. Also see added comment for explanation.
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3bf62d0a by Cheng Shao at 2026-03-26T03:57:03-04:00
ghci: use SmallArray directly in ResolvedBCO
This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when
applicable, making the memory representation more compact and reducing
marshaling overhead. Closes #27058.
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3d6492ce by Wen Kokke at 2026-03-26T03:57:53-04:00
Fix race condition between flushEventLog and start/endEventLogging.
This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving:
- `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`.
- `flushEventLog` flushes some events to `event_log_writer`.
- `startEventLogging` writes the eventlog header to `event_log_writer`.
This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header.
This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as:
```c
void flushEventLog(Capability **cap USED_IF_THREADS)
{
ACQUIRE_LOCK(&state_change_mutex);
flushEventLog_(cap);
RELEASE_LOCK(&state_change_mutex);
}
```
The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable.
I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours.
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7b9a75f0 by Phil Hazelden at 2026-03-26T03:58:37-04:00
Fix build with werror on glibc 2.43.
We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same
values as defined in glibc prior to 2.43. But in 2.43, glibc changes
them to new values, which means we get a warning when redefining them.
By `#undef`ing them first, we no longer get a warning.
Closes #27076.
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fe6e76c5 by Tobias Haslop at 2026-03-26T03:59:30-04:00
Fix broken Haddock link to Bifunctor class in description of Functor class
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404b71c1 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Fix assert in Interpreter.c
If we skip exactly the number of words on the stack we end up on
the first word in the next chunk.
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a85bd503 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Support arbitrary size unboxed tuples in bytecode
This stores the size (number of words on the stack) of the next
expected tuple in the TSO, ctoi_spill_size field, eliminating
the need of stg_ctoi_tN frames for each size.
Note: On 32 bit platform there is still a bytecode tuple size
limit of 255 words on the stack.
Fixes #26946
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e2209031 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Add specialized frames for small tuples
Small tuples are now returned more efficiently to the interpreter.
They use one less word of stack space and don't need manipulation
of the TSO anymore.
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b26bb2ea by VeryMilkyJoe at 2026-03-27T04:41:38-04:00
Remove backwards compatibility pattern synonym `ModLocation`
Fixes #24932
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66e5e324 by Vladislav Zavialov at 2026-03-27T04:42:25-04:00
Extend HsExpr with the StarIsType syntax (#26587, #26967)
This patch allows kinds of the form `k -> *` and `* -> k` to occur in
expression syntax, i.e. to be used as required type arguments.
For example:
{-# LANGUAGE RequiredTypeArguments, StarIsType #-}
x1 = f (* -> * -> *)
x2 = f (forall k. k -> *)
x3 = f ((* -> *) -> Constraint)
Summary of the changes:
* Introduce the HsStar constructor of HsExpr and its extension field XStar.
It is analogous to HsStarTy in HsType.
* Refactor HsStarTy to store the unicode flag as TokStar, defined as
type TokStar = EpUniToken "*" "★" -- similar to TokForall, TokRArrow, etc.
The token is stored in the extension field and replaces the Bool field.
* Extend the `infixexp2` nonterminal to parse `*` as a direct argument of `->`.
This is more limited than the full StarIsType syntax, but has the nice
property of not conflicting with the multiplication operator `a * b`.
Test case: T26967 T26967_tyop
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f8de456f by Sylvain Henry at 2026-03-27T04:43:22-04:00
STM: don't create a transaction in the rhs of catchRetry# (#26028)
We don't need to create a transaction for the rhs of (catchRetry#)
because contrary to the lhs we don't need to abort it on retry. Moreover
it is particularly harmful if we have code such as (#26028):
let cN = readTVar vN >> retry
tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
atomically tree
Because it will stack transactions for the rhss and the read-sets of all
the transactions will be iteratively merged in O(n^2) after the
execution of the most nested retry.
This is the second attempt at implementing this. The first attempt
triggered segfaults (#26291) and has been reverted.
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
- - - - -
fcf092dd by Luite Stegeman at 2026-03-27T04:44:17-04:00
Windows: remove StgAsyncIOResult and fix crash/leaks
In stg_block_async{_void}, a stack slot was reserved for
an StgAsyncIOResult. This slot would be filled by the IO
manager upon completion of the async call.
However, if the blocked thread was interrupted by an async
exception, we would end up in an invalid state:
- If the blocked computation was never re-entered, the
StgAsyncIOResult would never be freed.
- If the blocked computation was re-entered, the thread would
find an unitialized stack slot for the StgAsyncIOResult,
leading to a crash reading its fields, or freeing the pointer.
We fix this by removing the StgAsyncIOResult altogether and writing
the result directly to the stack.
Fixes #26341
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05094993 by Luite Stegeman at 2026-03-27T04:45:12-04:00
Don't refine DEFAULT alt for unary typeclasses
A non-DEFAULT data alt for a unary typeclass dictionary would
interfere with Unary Class Magic, leading to segfaults.
fixes #27071
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4ee260cf by sheaf at 2026-03-27T04:46:06-04:00
Fix several oversights in hsExprType
This commit fixes several oversights in GHC.Hs.Syn.Type.hsExprType:
- The 'RecordCon' case was returning the type of the constructor,
instead of the constructor application. This is fixed by using
'splitFunTys'.
- The 'ExplicitTuple' case failed to take into account tuple sections,
and was also incorrectly handling 1-tuples (e.g. 'Solo') which can
be constructed using Template Haskell.
- The 'NegApp' case was returning the type of the negation operator,
again failing to apply it to the argument. Fixed by using
'funResultTy'.
- The 'HsProc' case was computing the result type of the arrow proc
block, without taking into account the argument type. Fix that by
adding a new field to 'CmdTopTc' that stores the arrow type, so that
we can construct the correct result type `arr a b` for
`proc (pat :: a) -> (cmd :: b)`.
- The 'ArithSeq' and 'NegApp' cases were failing to take into account
the result 'HsWrapper', which could e.g. silently drop casts.
This is fixed by introducing 'syntaxExpr_wrappedFunResTy' which, on
top of taking the result type, applies the result 'HsWrapper'.
These fixes are validated by the new GHC API test T26910.
Fixes #26910
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e97232ce by Hai at 2026-03-27T04:47:04-04:00
Parser.y: avoid looking at token with QualifiedDo
This changes the behavior of 'hintQualifiedDo' so that the supplied
token is not inspected when the QualifiedDo language extension bit is
set.
- - - - -
9831385b by Vladislav Zavialov at 2026-03-27T17:22:30-04:00
Infix holes in types (#11107)
This patch introduces several improvements that follow naturally from
refactoring HsOpTy to represent the operator as an HsType, aligning it
with the approach taken by OpApp and HsExpr.
User-facing changes:
1. Infix holes (t1 `_` t2) are now permitted in types, following the
precedent set by term-level expressions.
Test case: T11107
2. Error messages for illegal promotion ticks are now reported at more
precise source locations.
Test case: T17865
Internal changes:
* The definition of HsOpTy now mirrors that of OpApp:
| HsOpTy (XOpTy p) (LHsType p) (LHsType p) (LHsType p)
| OpApp (XOpApp p) (LHsExpr p) (LHsExpr p) (LHsExpr p)
This moves us one step closer to unifying HsType and HsExpr.
* Ignoring locations,
the old pattern match (HsOpTy x prom lhs op rhs)
is now written as (HsOpTy x lhs (HsTyVar x' prom op) rhs)
but we also handle (HsOpTy x lhs (HsWildCardTy x') rhs)
Constructors other than HsTyVar and HsWildCardTy never appear
in the operator position.
* The various definitions across the compiler have been updated to work
with the new representation, drawing inspiration from the term-level
pipeline where appropriate. For example,
ppr_infix_ty <=> ppr_infix_expr
get_tyop <=> get_op
lookupTypeFixityRn <=> lookupExprFixityRn
(the latter is factored out from rnExpr)
Test cases: T11107 T17865
- - - - -
5b6757d7 by mangoiv at 2026-03-27T17:23:19-04:00
ci: build i386 non-validate for deb12
This is a small fix that will unlock ghcup metadata to run, i386 debian
12 was missing as a job.
- - - - -
cf942119 by Cheng Shao at 2026-03-30T15:24:37-04:00
ghc-boot: remove unused SizedSeq instances and functions
This commit removes unused `SizedSeq` instances and functions, only
keeping the bits we need for hpc tick sequence for now.
- - - - -
22c5b7cc by Cheng Shao at 2026-03-30T15:24:38-04:00
ghci: remove unused GHCi.BinaryArray
This patch removes the unused `GHCi.BinaryArray` module from `ghci`.
Closes #27108.
- - - - -
77abb4ab by Cheng Shao at 2026-03-30T15:25:21-04:00
testsuite: mark T17912 as fragile on Windows
T17912 is still fragile on Windows, it sometimes unexpectedly pass in
CI. This especially strains our already scarce Windows CI runner
resources. Mark it as fragile on Windows for the time being.
- - - - -
d741a6cc by Andreas Klebinger at 2026-03-31T04:39:33-04:00
Bump minimum shake version for hadrian.
We also add the shake version we want to stack.yaml
Fixes #26884
- - - - -
5e556f9e by Vladislav Zavialov at 2026-03-31T04:40:16-04:00
Status check for the HsType~HsExpr refactoring (#25121)
Add a test case to track the status of a refactoring project within GHC
whose goal is to arrive at the following declaration:
type HsType = HsExpr
The rationale for this is to increase code reuse between the term- and
type-level code in the compiler front-end (AST, parser, renamer, type checker).
The status report is saved to testsuite/tests/ghc-api/T25121_status.stdout
and provides useful insights into what needs to happen to make progress on
the ticket.
- - - - -
acffb1b1 by fendor at 2026-03-31T04:41:02-04:00
Extract Binary instances to `GHC.ByteCode.Binary`
- - - - -
e2ea8e25 by fendor at 2026-03-31T04:41:02-04:00
Add `seqNonEmpty` for evaluating `NonEmpty a`
- - - - -
048b00b7 by fendor at 2026-03-31T04:41:02-04:00
Record `LinkableUsage` instead of `Linkable` in `LoaderState`
Retaining a ByteCode `Linkable` after it has been loaded retains its
`UnlinkedBCO`, keeping it alive for the remainder of the program.
This starts accumulating a lot of `UnlinkedBCO` and memory over time.
However, the `Linkable` is merely used to later record its usage in
`mkObjectUsage`, which is used for recompilation checking.
However, this is incorrect, as the interface file and bytecode objects
could be in different states, e.g. the interface changes, but the
bytecode library hasn't changed so we don't need to recompile and vice
versa.
By computing a `Fingerprint` for the `ModuleByteCode`, and recording it
in the `LinkableUsage`, we know precisely whether the `ByteCode` object
on disk is outdated.
Thus, parts of this commit just makes sure that we efficiently compute a
`Fingerprint` for `ModuleByteCode` and store it in the on-disk
representation of `ModuleByteCode`.
We change the `LoaderState` to retain `LinkableUsage`, which is smaller
representation of a `Linkable`. This allows us to free the unneeded
fields of `Linkable` after linking them.
We declare the following memory invariants that this commit implements:
* No `LinkablePart` should be retained from `LoaderState`.
* `Linkable`s should be unloaded after they have been loaded.
These invariants are unfortunately tricky to automatically uphold, so we
are simply documenting our assumptions for now.
We introduce the `linkable-space` test which makes sure that after
loading, no `DotGBC` or `UnlinkedBCO` is retained.
-------------------------
Metric Increase:
MultiLayerModulesTH_OneShot
-------------------------
We allocate a bit more, but the peak number of bytes doesn't change.
While a bit unfortunate, accepting the metric increase.
We add multiple new performance measurements where we were able to
observe the desired memory invariants. Further, we add regression tests
to validate that the recompilation checker behaves more correct than
before.
- - - - -
2d1c1997 by Simon Jakobi at 2026-03-31T04:41:46-04:00
Eliminate dictionary-passing in ListMap operations
Mark the ListMap helpers 'INLINABLE' so importing modules can specialise
the 'TrieMap (ListMap m)' methods and avoid recursive dictionary-passing.
See Note [Making ListMap operations specialisable].
Fixes #27097
- - - - -
ed2c6570 by Cheng Shao at 2026-03-31T04:42:33-04:00
testsuite: fix testdir cleanup logic on Windows
testdir cleanup is unreliable on Windows (#13162) and despite existing
hacks in the driver, new failure mode has occurred. This patch makes
it print the warning and carry on when failed to clean up a testdir,
instead of reporting a spurious framework failure. See added comment
for detailed explanation.
- - - - -
d9388e29 by Simon Jakobi at 2026-03-31T13:14:59-04:00
Add regression test for #18177
Closes #18177.
Assisted-by: Codex
- - - - -
6a10045c by mangoiv at 2026-03-31T13:15:43-04:00
ci: allow metric decrease for two tests on i386
There has been a nightly failure on i386 due to a compiler runtime
improvement on i386 debian 12. We allow that.
Metric Decrease (test_env='i386-linux-deb12'):
T12707 T8095
- - - - -
7fbb4fcb by Rodrigo Mesquita at 2026-04-01T12:16:33+00:00
Bump default language edition to GHC2024
As per the accepted ghc-proposal#632
Fixes #26039
- - - - -
5ae43275 by Peng Fan at 2026-04-01T19:01:06-04:00
NCG/LA64: add cmpxchg and xchg primops
And append some new instructions for LA664 uarch.
Apply fix to cmpxchg-prim by Andreas Klebinger.
Suggestions in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15515
- - - - -
8f95534a by Duncan Coutts at 2026-04-01T19:01:52-04:00
Remove signal-based ticker implementations
Fixes issue #27073
All supported platforms should work with the pthreads + nanosleep based
ticker implementation. This avoids all the problems with using signals.
In practice, all supported platforms were probably using the non-signal
tickers already, which is probably why we do not get lots of reports
about deadlocks and other weirdness: we were definately using functions
that are not async signal safe in the tick handler (such as fflush to
flussh the eventlog).
Only Solaris was explicitly using the timer_create ticker impl, and even
Solaris could probably use the pthreads one (if anyone cared: Solaris is
no longer a Teir 3 supported platform).
Plausibly the only supported platform that this will change will be AIX,
which should now use the pthreads impl.
- - - - -
51b32b0d by Duncan Coutts at 2026-04-01T19:01:52-04:00
Tidy up some timer/ticker comments elsewhere
- - - - -
7562bcd7 by Duncan Coutts at 2026-04-01T19:01:52-04:00
Remove now-unused install_vtalrm_handler
Support function used by both of the signal-based ticker
implementations.
- - - - -
6da127c7 by Duncan Coutts at 2026-04-01T19:01:52-04:00
No longer probe for timer_create in rts/configure
It was only used by the TimerCreate.c ticker impl.
- - - - -
3fd490fa by Duncan Coutts at 2026-04-01T19:01:53-04:00
Note that rtsTimerSignal is deprecated.
- - - - -
63099b0f by Simon Jakobi at 2026-04-01T19:02:39-04:00
Add perf test for #13960
Closes #13960.
- - - - -
58009c14 by Apoorv Ingle at 2026-04-02T09:51:24+01:00
Streamline expansions using HsExpansion (#25001)
Notes added [Error Context Stack] [Typechecking by expansion: overview]
Notes updated Note [Expanding HsDo with XXExprGhcRn] [tcApp: typechecking applications]
-------------------------
Metric Decrease:
T9020
-------------------------
There are 2 key changes:
1. `HsExpand` datatype mediates between expansions
2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv`
This has some consequences detailed below:
1. `HsExpand` datatype mediates between expansions
* Simplifies the implementations of `tcExpr` to work on `XExpr`
* Removes `VACtxt` (and its associated `VAExpansion` and `VACall`) datatype, it is subsumed by simply a `SrcSpan`.
* Removes the function `addHeadCtxt` as it is now mearly setting a location
* The function `tcValArgs` does its own argument number management
* move `splitHsTypes` out of `tcApp`
* Removes special case of tcBody from `tcLambdaMatches`
* Removes special case of `dsExpr` for `ExpandedThingTc`
* Renames `tcMonoExpr` -> `tcMonoLExpr`, `tcMonoExprNC` -> `tcMonoLExpr`
* Renames `EValArg`, `EValArgQL` fields: `ea_ctxt` -> `ea_loc_span` and `eaql_ctx` -> `eaql_loc_span`
* Remove `PopErrCtxt` from `XXExprGhcRn`
* `fun_orig` in tcInstFun depends on the SrcSpan of the head of the application chain (similar to addArgCtxt)
- it references the application chain head if it is user located, or
uses the error context stack as a fallback if it's a generated
location
* Make a new variant `GeneratedSrcSpan` in `SrcSpan` for HIEAst Nodes
- Expressions wrapped around `GeneratedSrcSpan` are ignored and never added to the error context stack
- In Explicit list expansion `fromListN` is wrapped with a `GeneratedSrcSpan` with `GeneratedSrcSpanDetails` field to store the original srcspan
2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv`
* Merge `HsThingRn` to `HsCtxt`
* Landmark Error messages are now just computed on the fly
* Make HsExpandedRn and HsExpandedTc payload a located HsExpr GhcRn
* `HsCtxt` are tidied and zonked at the end right before printing
Co-authored-by: simonpj <simon.peytonjones(a)gmail.com>
- - - - -
bc4b4487 by Zubin Duggal at 2026-04-03T14:22:27-04:00
driver: recognise .dyn_o as a valid object file to link if passed on the command line.
This allows plugins compiled with this suffix to run.
Fixes #24486
- - - - -
5ebb9121 by Simon Jakobi at 2026-04-03T14:23:11-04:00
Add regression test for #16145
Closes #16145.
- - - - -
c1fc1c44 by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Refactor eta-expansion in Prep
The Prep pass does eta-expansion but I found cases where it was
doing bad things. So I refactored and simplified it quite a bit.
In the new design
* There is no distinction between `rhs` and `body`; in particular,
lambdas can now appear anywhere, rather than just as the RHS of
a let-binding.
* This change led to a significant simplification of Prep, and
a more straightforward explanation of eta-expansion. See the new
Note [Eta expansion]
* The consequences is that CoreToStg needs to handle naked lambdas.
This is very easy; but it does need a unique supply, which forces
some simple refactoring. Having a unique supply to hand is probably
a good thing anyway.
- - - - -
21beda2c by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Clarify Note [Interesting dictionary arguments]
Ticket #26831 ended up concluding that the code for
GHC.Core.Opt.Specialise.interestingDict was good, but the
commments were a bit inadequate.
This commit improves the comments slightly.
- - - - -
3eaac1f2 by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Make inlining a bit more eager for overloaded functions
If we have
f d = ... (class-op d x y) ...
we should be eager to inline `f`, because that may change the
higher order call (class-op d x y) into a call to a statically
known function.
See the discussion on #26831.
Even though this does a bit /more/ inlining, compile times
decrease by an average of 0.4%.
Compile time changes:
DsIncompleteRecSel3(normal) 431,786,104 -2.2%
ManyAlternatives(normal) 670,883,768 -1.6%
ManyConstructors(normal) 3,758,493,832 -2.6% GOOD
MultilineStringsPerf(normal) 29,900,576 -2.8%
T14052Type(ghci) 1,047,600,848 -1.2%
T17836(normal) 392,852,328 -5.2%
T18478(normal) 442,785,768 -1.4%
T21839c(normal) 341,536,992 -14.1% GOOD
T3064(normal) 174,086,152 +5.3% BAD
T5631(normal) 506,867,800 +1.0%
hard_hole_fits(normal) 209,530,736 -1.3%
info_table_map_perf(normal) 19,523,093,184 -1.2%
parsing001(normal) 377,810,528 -1.1%
pmcOrPats(normal) 60,075,264 -0.5%
geo. mean -0.4%
minimum -14.1%
maximum +5.3%
Runtime changes
haddock.Cabal(normal) 27,351,988,792 -0.7%
haddock.base(normal) 26,997,212,560 -0.6%
haddock.compiler(normal) 219,531,332,960 -1.0%
Metric Decrease:
LinkableUsage01
ManyConstructors
T17949
T21839c
T13035
TcPlugin_RewritePerf
hard_hole_fits
Metric Increase:
T3064
- - - - -
5cbc2c82 by Matthew Pickering at 2026-04-03T19:57:02-04:00
bytecode: Add magic header/version to bytecode files
In order to avoid confusing errors when using stale interface files (ie
from an older compiler version), we add a simple header/version check
like the one for interface files.
Fixes #27068
- - - - -
d95a1936 by fendor at 2026-04-03T19:57:02-04:00
Add constants for bytecode in-memory buffer size
Introduce a common constant for the default size of the .gbc and
.bytecodelib binary buffer.
The buffer is by default set to 1 MB.
- - - - -
b822c30a by mangoiv at 2026-04-03T19:57:49-04:00
testsuite: filter stderr for static001 on darwin
This reactivates the test on x86_64 darwin as this should have been done
long ago and ignores warnings emitted by ranlib on newer version of the
darwin toolchain since they are benign. (no symbols for stub libraries)
Fixes #27116
- - - - -
28ce1f8a by Andreas Klebinger at 2026-04-03T19:58:44-04:00
Give the Data instance for ModuleName a non-bottom toConstr implementation.
I've also taken the liberty to add Note [Data.Data instances for GHC AST Types]
describing some of the uses of Data.Data I could find.
Fixes #27129
- - - - -
8ca41ffe by mangoiv at 2026-04-03T19:59:30-04:00
issue template: fix add bug label
- - - - -
3981db0c by Sylvain Henry at 2026-04-03T20:00:33-04:00
Add more canned GC functions for common register patterns (#27142)
Based on analysis of heap-check sites across the GHC compiler and Cabal,
the following patterns were not covered by existing canned GC functions
but occurred frequently enough to warrant specialisation:
stg_gc_ppppp -- 5 GC pointers
stg_gc_ip -- unboxed word + GC pointer
stg_gc_pi -- GC pointer + unboxed word
stg_gc_ii -- two unboxed words
stg_gc_bpp -- byte (I8) + two GC pointers
Adding these reduces the fraction of heap-check sites falling back to
the generic GC path from ~1.4% to ~0.4% when compiling GHC itself.
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
- - - - -
d17d1435 by Matthew Pickering at 2026-04-03T20:01:19-04:00
Make home unit dependencies stored as sets
Co-authored-by: Wolfgang Jeltsch <wolfgang(a)well-typed.com>
- - - - -
92a97015 by Simon Peyton Jones at 2026-04-05T00:58:57+01:00
Add Invariant (NoTypeShadowing) to Core
This commit addresses #26868, by adding
a new invariant (NoTypeShadowing) to Core.
See Note [No type-shadowing in Core] in GHC.Core
- - - - -
8b5a5020 by Simon Peyton Jones at 2026-04-05T00:58:57+01:00
Major refactor of free-variable functions
For some time we have had two free-variable mechanims for types:
* The "FV" mechanism, embodied in GHC.Utils.FV, which worked OK, but
was fragile where eta-expansion was concerned.
* The TyCoFolder mechanism, using a one-shot EndoOS accumulator
I finally got tired of this and refactored the whole thing, thereby
addressing #27080. Now we have
* `GHC.Types.Var.FV`, which has a composable free-variable result type,
very much in the spirit of the old `FV`, but much more robust.
(It uses the "one shot trick".)
* GHC.Core.TyCo.FVs now has just one technology for free variables.
All this led to a lot of renaming.
There are couple of error-message changes. The change in T18451
makes an already-poor error message even more mysterious. But
it really needs a separate look.
We also now traverse the AST in a different order leading to a different
but still deterministic order for FVs and test output has been adjusted
accordingly.
- - - - -
4bf040c6 by sheaf at 2026-04-05T14:56:29-04:00
Add utility pprTrace_ function
This function is useful for quick debugging, as it can be added to a
where clause to pretty-print debugging information:
fooBar x y
| cond = body1
| otherwise = body2
where
!_ = pprTrace_ "fooBar" $
vcat [ text "x:" <+> ppr x
, text "y:" <+> ppr y
, text "cond:" <+> ppr cond
]
- - - - -
502e6ffe by Andrew Lelechenko at 2026-04-07T04:47:21-04:00
base: improve error message for Data.Char.chr
As per https://github.com/haskell/core-libraries-committee/issues/384
- - - - -
b21bd52e by Simon Peyton Jones at 2026-04-07T04:48:07-04:00
Refactor FunResCtxt a bit
Fixes #27154
- - - - -
7fe84ea5 by Zubin Duggal at 2026-04-07T19:11:52+05:30
compiler: Warn when -finfo-table-map is used with -fllvm
These are currently not supported together.
Fixes #26435
- - - - -
4a45a7da by Matthew Pickering at 2026-04-08T04:37:29-04:00
packaging: correctly propagate build/host/target to bindist configure script
At the moment the host and target which we will produce a compiler for
is fixed at the initial configure time. Therefore we need to persist
the choice made at this time into the installation bindist as well so we
look for the right tools, with the right prefixes at install time.
In the future, we want to provide a bit more control about what kind of
bindist we produce so the logic about what the host/target will have to
be written by hadrian rather than persisted by the configure script. In
particular with cross compilers we want to either build a normal stage 2
cross bindist or a stage 3 bindist, which creates a bindist which has a
native compiler for the target platform.
Fixes #21970
Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com>
- - - - -
b0950df6 by Sven Tennie at 2026-04-08T04:37:29-04:00
Cross --host and --target no longer required for cross (#21970)
We set sane defaults in the configure script. Thus, these paramenters
aren't required any longer.
- - - - -
fef35216 by Sven Tennie at 2026-04-08T04:37:30-04:00
ci: Define USER_CONF_CC_OPTS_STAGE2 for aarch64/mingw
ghc-toolchain doesn't see $CONF_CC_OPTS_STAGE2 when the bindist gets
configured. So, the hack to override the compiler gets lost.
- - - - -
8dd6f453 by Cheng Shao at 2026-04-08T04:38:11-04:00
ghci: use ShortByteString for LookupSymbol/LookupSymbolInDLL/LookupClosure messages
This patch refactors ghci to use `ShortByteString` for
`LookupSymbol`/`LookupSymbolInDLL`/`LookupClosure` messages as the
first part of #27147.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
371ef200 by Cheng Shao at 2026-04-08T04:38:11-04:00
ghci: use ShortByteString for MkCostCentres message
This patch refactors ghci to use `ShortByteString` for `MkCostCentres`
messages as a first part of #27147. This also considerably lowers the
memory overhead of breakpoints when cost center profiling is enabled.
-------------------------
Metric Decrease:
interpreter_steplocal
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
4a122bb6 by Phil Hazelden at 2026-04-08T20:49:42-04:00
Implement modifiers syntax.
The `%m` syntax of linear types is now accepted in more places, to allow
use by future extensions, though so far linear types is still the only
consumer.
This may break existing code where it
* Uses -XLinearTypes.
* Has code of the form `a %m -> b`, where `m` can't be inferred to be
kind Multiplicity.
The code can be fixed either by adding a kind annotation, or by setting
`-XLinearTypes -XNoModifiers`.
Proposal:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0370-m…
- - - - -
07267f79 by Zubin Duggal at 2026-04-08T20:50:25-04:00
hadrian: Don't include the package hash in the haddock directory
Since GHC 9.8 and hash_unit_ids, haddock urls have looked like`ghc-9.10.3/doc/html/libraries/base-4.20.2.0-39f9/**/*.html`
The inclusion of the hash makes it hard for downstream non-boot packages to properly link to these files, as the hash is not
part of a standard cabal substitution.
Since we only build one version of each package, we don't need the hash to disambiguate anything, we can just remove it.
Fixes #26635
- - - - -
0a83b95b by ARATA Mizuki at 2026-04-08T20:51:18-04:00
testsuite: Allow multiple ways to be run by setting multiple command-line options
This patch allows multiple `--test-way`s to take effect, like:
$ hadrian/build test --test-way=normal --test-way=llvm
Previously, only one way was run if the test speed was 'normal' or 'fast'.
Closes #26926
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
- - - - -
e841931c by Teo Camarasu at 2026-04-08T20:52:00-04:00
doc: improve eventlog-flush-interval flag documentation
We mention the performance cost and how this flag can be turned off.
Resolves #27056
- - - - -
e332db25 by Teo Camarasu at 2026-04-08T20:52:01-04:00
docs/user_guide: fix typo
- - - - -
5b82080a by Simon Jakobi at 2026-04-08T20:52:44-04:00
Fix -dsuppress-uniques for free variables in demand signatures
Before: Str=b{sXyZ->S}
With this patch: Str=b{S}
T13143.stderr is updated accordingly.
Fixes #27106.
- - - - -
b7a084cc by Simon Jakobi at 2026-04-08T20:53:27-04:00
Documentation fixes for demand signature notation
Fixes #27115.
- - - - -
59391132 by Simon Jakobi at 2026-04-08T20:54:08-04:00
Use upsert for non-deleting map updates
Some compiler functions were using `alter`, despite never removing
any entries: they only update an existing entry or insert a new one.
These functions are converted to using `upsert`:
alter :: (Maybe a -> Maybe a) -> Key -> Map a -> Map a
upsert :: (Maybe a -> a) -> Key -> Map a -> Map a
`upsert` variants are also added to APIs of the various Word64Map
wrapper types.
The precedent for this `upsert` operation is in the containers library:
see https://github.com/haskell/containers/pull/1145
Metrics: compile_time/bytes allocated
-------------------------------------
geo. mean: -0.1%
minimum: -0.5%
maximum: +0.0%
Resolves #27140.
- - - - -
da7e82f4 by Cheng Shao at 2026-04-08T20:54:49-04:00
testsuite: fix testsuite run for +ipe again
This patch makes the +ipe flavour transformer pass the entire
testsuite again by dropping stdout/stderr checks of certain tests that
are sensitive to stack layout changes with `+ipe`. Related: #26799.
- - - - -
b135a87d by Zubin Duggal at 2026-04-09T19:36:50+05:30
Bump directory submodule to 1.3.11.0 (unreleased)
- - - - -
3a291d07 by Zubin Duggal at 2026-04-09T19:36:50+05:30
Bump file-io submodule to 0.2.0
- - - - -
e0ab606d by Zubin Duggal at 2026-04-10T18:40:20+05:30
Release notes for GHC 10.0
- - - - -
e08b9b34 by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump ghc-prim version to 0.14.0
- - - - -
a92aac6e by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump template-haskell to 2.25.0.0; update submodule exceptions for TH 2.25
- - - - -
f254d9e8 by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump GHC version to 10.0
- - - - -
6ce0368a by Zubin Duggal at 2026-04-10T18:40:28+05:30
Bump base to 4.23.0.0; update submodules for base 4.24 upper bound
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702fb8a5 by Zubin Duggal at 2026-04-10T18:40:28+05:30
Bump GHC version to 10.1; update submodules template-haskell-lift and template-haskell-quasiquoter for ghc-internal 10.200
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75df1ca4 by Zubin Duggal at 2026-04-10T18:40:28+05:30
Use changelog.d for release notes (#26002)
GHC now uses a fragment-based changelog workflow using a custom script adapted from https://codeberg.org/fgaz/changelog-d.
Contributors add a file in changelog.d/ for each user-facing change.
At release time, these are assembled into release notes for sphinx (in RST) format, using
the tool.
New hadrian `changelog` target to generate changelogs
CI job to validate changelog entries for MRs unless skipped with ~"no-changelog" label
Teach sphinx about ghc-mr: extlink to link to MRs
Remove `ghc-package-list` from sphinx, and implement it in changelog-d instead (Fixes #26476).
(cherry picked from commit 989c07249978f418dfde1353abfad453f024d61a)
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585d7450 by Luite Stegeman at 2026-04-11T02:17:13-04:00
tc: discard warnings in tcUserStmt Plan C
We typecheck let_stmt twice, but we don't want the warnings twice!
see #26233
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2df604e9 by Sylvain Henry at 2026-04-11T02:19:30-04:00
Introduce TargetInt to represent target's Int (#15973)
GHC was using host 'Int' in several places to represent values that
live in the target machine's 'Int' type. This is silently wrong when
cross-compiling from a 32-bit host to a 64-bit target: the host Int
is 32 bits while the target Int is 64 bits.
See Note [TargetInt] in GHC.Platform.
Also used the opportunity to make DynTag = Word8.
Fixes #15973
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
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d419e972 by Luite Stegeman at 2026-04-13T15:16:04-04:00
Suppress desugaring warnings in the pattern match checker
Avoid duplicating warnings from the actual desugaring pass.
fixes #25996
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c5b80dd0 by Phil de Joux at 2026-04-13T15:16:51-04:00
Typo ~/ghc/arch-os-version/environments
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71462fff by Luite Stegeman at 2026-04-13T15:17:38-04:00
add changelog entry for #26233
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d1ddfd4b by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Add test for #25636
The existing test behaviour of "T23146_liftedeq" changed because the
simplifier now does a bit more inlining. We can restore the previous bad
behavior by using an OPAQUE pragma.
This test doubles as a test for #25636 when run in ghci, so we add it as
such.
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b9df40ee by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
refactor: protoBCOName is always a Name
Simplifies the code by removing the unnecessary type argument to
ProtoBCO which was always 'Name'
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5c2a179e by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Allocate static constructors for bytecode
This commit adds support for static constructors when compiling and
linking ByteCode objects.
Top-level StgRhsCon get lowered to ProtoStaticCons rather than to
ProtoBCOs. A ProtoStaticCon gets allocated directly as a data con
application on the heap (using the new primop newConApp#).
Previously, we would allocate a ProtoBCO which, when evaluated, would
PACK and return the constructor.
A few more details are given in Note [Static constructors in Bytecode].
Secondly, this commit also fixes issue #25636 which was caused by
linking *unlifted* constructors in BCO instructions as
- (1) a thunk indexing the array of BCOs in a module
- (2) which evaluated to a BCO which still had to be evaluated to
return the unlifted constructor proper.
The (2) issue has been resolved by allocating the static constructors
directly. The (1) issue can be resolved by ensuring that we allocate all
unlifted top-level constructors eagerly, and leave the knot-tying for
the lifted BCOs and top-level constructors only.
The top-level unlifted constructors are never mutually recursive, so we
can allocate them all in one go as long as we do it in topological
order. Lifted fields of unlifted constructors can still be filled by the
knot-tied lifted variables since in those fields it is fine to keep
those thunks. See Note [Tying the knot in createBCOs] for more details.
Fixes #25636
-------------------------
Metric Decrease:
LinkableUsage01
-------------------------
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cde47053 by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Revert "StgToByteCode: Assert that PUSH_G'd values are lifted"
This reverts commit ec26c54d818e0cd328276196930313f66b780905.
Ever since f7a22c0f4e9ae0dc767115d4c53fddbd8372b777, we now do support
and will link top-level unlifted constructors into evaluated and
properly tagged values which we can reference with PUSH_G.
This assertion is no longer true and triggered a failure in T25636
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c7a7e5b8 by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
refactor: Tag more remote Ptrs as RemotePtr
Pure refactor which improves the API of
- GHC.ByteCode.Linker
- GHC.Runtime.Interpreter
- GHC.Runtime.Interpreter.Types.SymbolCache
by using `RemotePtr` for more functions which used to return `Ptr`s that
could potentially be in a foreign process. E.g. `lookupIE`,
`lookupStaticPtr`, etc...
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fc59494c by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Add float# and subword tests for #25636
These tests cover that static constructors in bytecode work correctly
for Float# and subword values (Word8#, Word16#)
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477f521b by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
test: Validate topoSort logic in createBCOs
This test validates that the topological sorting and ordering of the
unlifted constructors and lifted constructors in `createBCOs` is
correct.
See `Note [Tying the knot in createBCOs]` for why tying the knot for the
created BCOs is slightly difficult and why the topological sorting is
necessary.
This test fails when `let topoSortedObjs = topSortObjs objs` is
substituted by `let topoSortedObjs = zip [0..] objs`, thus witnessing
the toposort logic is correct and necessary.
The test calls the ghci `createBCOs` directly because it is currently
impossible to construct in Source Haskell a situation where a top-level
static unlifted constructor depends on another (we don't have top-level
unlifted constructors except for nullary constructors like `Leaf ::
(UTree :: UnliftedType)`).
This is another test for fix for #25636
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2d9c30be by Simon Jakobi at 2026-04-14T18:42:00-04:00
Improve tests for `elem`
...in order to simplify the work on #27096.
* Improve T17752 by including the Core output in golden files, checking
both -O1 and -O2.
* Add tests for fusion and no-fusion cases.
Fixes #27101.
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2dadf3b0 by sheaf at 2026-04-16T13:28:39-04:00
Simplify mkTick
This commit simplifies 'GHC.Core.Utils.mkTick', removing the
accumulating parameter 'rest' which was suspiciously treating a bunch of
different ticks as a group, and moving the group as a whole around the
AST, ignoring that the ticks in the group might have different placement
properties.
The most important change is that we revert the logic (added in 85b0aae2)
that allowed ticks to be placed around coercions, which caused serious
issues (e.g. #27121). It was just a mistake, as it doesn't make sense
to put a tick around a coercion.
Also adds Note [Pushing SCCs inwards] which clarifies the logic for
pushing SCCs into lambdas, constructor applications, and dropping SCCs
around non-function variables (in particular the treatment of splittable
ticks).
A few other changes are also implemented:
- simplify 'can_split' predicate (no functional change)
- combine profiling ticks into one when possible
Fixes #26878, #26941 and #27121
Co-authored-by: simonpj <simon.peytonjones(a)gmail.com>
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a0d6f1f4 by Simon Jakobi at 2026-04-16T13:29:28-04:00
Add regression test for #9074
Closes #9074.
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d178ee89 by Sylvain Henry at 2026-04-16T13:30:25-04:00
Add changelog for #15973
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e8a196c6 by sheaf at 2026-04-16T13:31:19-04:00
Deal with 'noSpec' in 'coreExprToPmLit'
This commit makes two separate changes relating to
'GHC.HsToCore.Pmc.Solver.Types.coreExprAsPmLit':
1. Commit 7124e4ad mistakenly marked deferred errors as non-canonical,
which led to the introduction of 'nospec' wrappers in the
generated Core. This reverts that accident by declaring deferred
errors as being canonical, avoiding spurious 'nospec' wrapping.
2. Look through magic identity-like Ids such as 'nospec', 'inline' and
'lazy' in 'coreExprAsPmLit', just like Core Prep does.
There might genuinely be incoherent evidence, but that shouldn't
obstruct the pattern match checker. See test T27124a.
Fixes #25926 #27124
-------------------------
Metric Decrease:
T3294
-------------------------
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8cb99552 by Sylvain Henry at 2026-04-16T19:22:43-04:00
hadrian: warn when package index is missing (#16484)
Since cabal-install 3.0 we can query the path of remote-repo-cache and
check if hackage package index is present.
Fixes #16484
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d6ce7477 by Richard Eisenberg at 2026-04-16T19:23:25-04:00
Teach hadrian to --skip-test.
Fixes #27188.
This adds the --skip-test flag to `hadrian build`, as documented in the
patch.
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7666f4a9 by Fendor at 2026-04-17T22:29:51-04:00
Migrate `ghc-pkg` to use `OsPath` and `file-io`
`ghc-pkg` should use UNC paths as much as possible to avoid MAX_PATH
issues on windows.
`file-io` uses UNC Paths by default on windows, ensuring we use the
correct APIs and that we finally are no longer plagued by MAX_PATH
issues in CI and private machines.
On top of it, the higher correctness of `OsPath` is appreciated in this
small codebase. Also, we improve memory usage very slightly, due to the
more efficient memory representation of `OsPath` over `FilePath`
Adds `ghc-pkg` regression test for MAX_PATH on windows
Make sure `ghc-pkg` behaves as expected when long paths (> 255) are
involved on windows.
Let's generate a testcase where we can actually observe that `ghc-pkg`
behaves as epxected.
See the documentation for windows on Maximum Path Length Limitation:
* `https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation`
Adds changelog entry for long path support in ghc-pkg.
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78434e8c by Simon Peyton Jones at 2026-04-17T22:30:38-04:00
Kill off the substitution in Lint
Now that we have invariant (NoTypeShadowing) we no longer
need Lint to carry an ambient substitution. This makes it
simpler and faster. A really worthwhile refactor.
There are some knock-on effects
* Linting join points after worker/wrapper. See
Note [Join points and beta redexes]
* Running a type substitution after the desugarer.
See Note [Substituting type-lets] in
the new module GHC.Core.SubstTypeLets
Implements #27078
Most perf tests don't use Lint so we won't see a perf incresae.
But T1969, which uses -O0 and Lint, gets 1.3% worse because it has
to run the SubstTypeLets pass which is a somewhat expensive no-op
Overall though compile-time allocations are down 0.1%.
Metric Increase:
T1969
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86ca6c2c by mangoiv at 2026-04-17T22:31:22-04:00
testsuite: inline elemCoreTest
Some weird (probably python scoping) rule caused elemCoreTest, a regex
being out of scope on ubuntu, presumably because of a newer python version.
This patch just inlines the regex, which fixes the issue.
Fixes #27193
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72d6dc74 by aparker at 2026-04-20T20:15:44-04:00
NCG: Implement constant folding for vector simd ops (Issue #25030)
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b9cab907 by sheaf at 2026-04-20T20:15:44-04:00
Mark some SIMD tests as broken on i386 optllvm
As seen in #25498, several SIMD tests are broken on i386 in the optllvm
way. This commit marks them as "expect_broken".
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76528cc3 by Wolfgang Jeltsch at 2026-04-20T20:16:25-04:00
Move most of the `System.IO` implementation into `base`
This involves a rewrite of the `combine` helper function to avoid the
use of `last`, which would now be flagged as an error.
Metric Decrease:
LinkableUsage01
T3294
Metric Increase:
T12227
T12707
T5642
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04d143c0 by Luite Stegeman at 2026-04-21T14:05:33-04:00
rts: add a few missing i386 relocations in the rts linker
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014087e7 by Luite Stegeman at 2026-04-21T14:05:34-04:00
CodeOutput: Fix finalizers on multiple platforms
- ELF platforms: emit .fini_array section
- wasm32/Darwin: emit initializer with __cxa_atexit call
- Windows: use -Wl,--whole-archive to prevent dropping finalizer symbols
- rts linker: fix crash/assertion failure unloading objects with finalizers
fixes #27072
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915bba6f by Simon Jakobi at 2026-04-21T14:06:16-04:00
Add regression test for #10531
Closes #10531.
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86a646a6 by Andreas Klebinger at 2026-04-22T13:00:05-04:00
Revert use of generic instances for compiler time perf reasons.
Revert "Derive Semigroup/Monoid for instances believed could be derived in #25871"
This reverts commit 11a04cbb221cc404fe00d65d7c951558ede4caa9.
Revert "add Ghc.Data.Pair deriving"
This reverts commit 15d9ce449e1be8c01b89fd39bdf1e700ea7d1dce.
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bc9ee1cf by Wen Kokke at 2026-04-22T13:00:51-04:00
hadrian: Fix docs to remove static flavour
In 638f6548, the static flavour was turned into into the fully_static
flavour transformer. However, this commit did not update flavours.md.
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cc9cc6d5 by Cheng Shao at 2026-04-23T09:40:46+00:00
configure: bump LlvmMaxVersion to 23
This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases.
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2ea7ef8e by Cheng Shao at 2026-04-23T09:46:26+00:00
changelog: add llvm 22.x support
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5574ee10 by Cheng Shao at 2026-04-24T08:24:30-04:00
compiler: avoid unused temporary `appendFS` operands
This patch fixes unused temporary `appendFS` operands in the codebase
that are retained in the `FastString` table after concatenation.
Rewrite rules are added so that if an operand is
`fsLit`/`mkFastString`, the `appendFS` application is rewritten to
append the `ShortByteString` operands first. The patch also fixes
`sconcat` behavior to align with `mconcat` for the same reason. Fixes #27205.
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4ed78760 by mangoiv at 2026-04-24T08:25:13-04:00
contributing: adjust MR template to be less verbose
- MR template only shows text that is relevant for submissiong
- MR template was rewritten so it's readable from a user's and reviewer's
perspective
Resolves #27165
Co-Authored-By: @sheaf
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87db83e2 by Cheng Shao at 2026-04-24T14:37:21-04:00
ci: bump freebsd boot ghc to 9.10.3
This commit bumps freebsd boot ghc to 9.10.3 to align with other
platforms and prevent outdated boot libs in boot ghc to block the
freebsd job.
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17e3a0b7 by Cheng Shao at 2026-04-24T14:37:21-04:00
compiler: improve Binary instance of Array
This patch improves the `Binary` instance of `Array`:
- We no longer allocate intermediate lists. When serializing an
`Array`, we iterate over the elements directly; when deserializing
it, we allocate the result `Array` and fill it in a loop.
- Now we only serialize the array bounds tuple; the length field is
not needed.
Closes #27109.
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2d30f7d3 by sheaf at 2026-04-24T14:38:23-04:00
Vendor mini-QuickCheck for testsuite
This commit extracts the vendored QuickCheck implementation from the
foundation testsuite to make it more broadly available in the GHC
testsuite, and makes use of it in the simd006 test (which also used
a vendored QuickCheck implementation).
On the way, we update the linear congruential generator to avoid the
shortcoming of only generating 31 bit large numbers.
Fixes #25990 and #25969.
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1350271b by sheaf at 2026-04-27T09:32:53-04:00
Ensure TcM plugins are only initialised once
This commit ensures we keep TcM plugins (typechecker plugins,
defaulting plugins and hole fit plugins) running all the way through
desugaring, instead of stopping them at the end of typechecking.
To do this, the "stop" actions of TcPlugin and DefaultingPlugin are
split into two: one for the "post-typecheck" action, and one for the
final shutdown action (after desugaring).
This allows the plugins to be invoked by the pattern match checker
(during desugaring) without having to be repeatedly re-initialised and
stopped, fixing #26839.
In the process, this commit modifies 'initTc' and 'initTcInteractive',
adding an extra argument that describes whether to start/stop the 'TcM'
plugins.
See Note [Stop TcM plugins after desugaring] for an overview.
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42549222 by sheaf at 2026-04-27T09:33:50-04:00
Hadrian: add --keep-response-files
This commit adds a Hadrian flag that allows response files to be
retained. This is useful for debugging a failing Hadrian command line.
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40564e8d by sheaf at 2026-04-27T09:34:46-04:00
hadrian/build-cabal.bat: fix build on Windows
Commit 8cb99552f6 introduced a warning for a missing package index.
However, the logic was faulty on Windows: the piping was broken, and
"remote-repo-cache:" was being interpreted as a (malformed) drive letter,
leading to the error:
The filename, directory name, or volume label syntax is incorrect.
This commit fixes that by using a temporary file instead of piping.
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14bc71e4 by Sven Tennie at 2026-04-28T13:22:47-04:00
ghc: Distinguish between having an interpreter and having an internal one
Actually, these are related but different things:
- ghc can run an interpreter (either internal or external)
- ghc is compiled with an internal interpreter
Splitting the logic solves compiler warnings and expresses the intent
better.
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df691563 by Vladislav Zavialov at 2026-04-28T13:23:29-04:00
Refactor HsWildCardTy to use HoleKind (#27111)
The payload of this patch is that the extension fields of HsWildCardTy
and HsHole now match:
type instance XWildCardTy Ghc{Ps,Rn} = HoleKind
type instance XHole Ghc{Ps,Rn} = HoleKind
This is progress towards unification of HsExpr and HsType.
Test case: T25121_status
In addition to that, exact-printing of infix holes is fixed.
Test case: PprInfixHole
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f3485446 by fendor at 2026-04-28T13:24:12-04:00
Expose startupHpc as an rts symbol
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28f07d70 by fendor at 2026-04-28T13:24:12-04:00
Make HPC work with bytecode interpreter
Add support to generate .tix files from bytecode objects and the
bytecode interpreter.
Conceptually, we insert HPC ticks into the bytecode similar to how we insert
breakpoints.
HPC and breakpoints do not share the same tick array but we use a separate
tick-array for hpc/breakpoint ticks during bytecode generation.
We teach the bytecode interpreter to handle hpc ticks.
The implementation is quite trivial, simply increment the counter in the
global hpc_ticks array for the respective module.
This hpc_ticks array is generated as part of the `CStub`, so we can rely
on it existing.
A tricky bit is "registering" a bytecode object for HPC instrumentation.
In the compiled case, this is achieved via CStub and initializer/finalizers
`.init` sections which are called when the executable is run.
After the initializers have been invoked, which is before `hs_init_ghc`,
we then call `startup_hpc` in `hs_init_ghc` iff any modules were "registered"
for hpc instrumentation via `hs_hpc_module`.
Since bytecode objects are loaded after starting up GHCi, this workflow
doesn't work for supporting `hpc` and the `hpc` run-time is never
started, even if a module is added for instrumentation.
We fix this issue by employing the same technique as is for `SptEntry`s:
* We introduce a new field to `CompiledByteCode`, called `ByteCodeHpcInfo`
which contains enough information to call `hs_hpc_module`, allowing us to
register the module for `hpc` instrumentation`.
* After registering the module, we unconditionally call `startupHpc`, to make
sure the .tix file is written.
Calling `startupHpc` multiple times is safe.
Calling `hs_hpc_module` multiple times for the same module is also safe.
If we didn't register the hpc module in this way, evaluating a bytecode object
instrumented with `-fhpc` without registering it in the `hpc` run-time will
simply not generate any `.tix` files for this bytecode object.
However, this shouldn't happen if everything is set up correctly.
Closes #27036
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950879f0 by Vladislav Zavialov at 2026-04-28T13:24:55-04:00
Move NamespaceSpecifier from x-fields into the AST proper (#26678)
This refactoring moves NamespaceSpecifier out of extension fields and into the
AST proper, as it is part of the user-written source, and is not pass-specific.
Summary of changes:
* Move NamespaceSpecifier from GHC/Hs/Basic.hs to Language/Haskell/Syntax/ImpExp.hs
and parameterise it by the compiler pass, creating the necessary extension points
* Move NamespaceSpecifier out of XFixitySig into FixitySig
* Move NamespaceSpecifier out of XIEThingAll (IEThingAllExt) into IEThingAll
* Move NamespaceSpecifier out of XIEWholeNamespace (IEWholeNamespaceExt) into IEWholeNamespace
This is a pure refactoring with no change in behaviour.
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9797052b by Simon Peyton Jones at 2026-04-28T13:25:37-04:00
Fix assertion check in checkResultTy
As #27210 shows, the assertion was a little bit too eager.
I refactored a bit by moving some code from GHC.Tc.Gen.App
to GHC.Tc.Utils.Unify; see the new function tcSubTypeApp,
which replaces tcSubTypeDS
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9f85f034 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Make cmm 'import "package" name;' syntax use consistent label types
There is a little-used syntactic form in cmm imports:
import "package" foo;
Which means to import foo from the given package (unit id, specified as
a string). This syntax is somewhat reminiscent of GHC's package import
extension.
This syntax form is not used in the rts cmm code, nor any of the boot
libraries. It may not be used at all. Unclear.
Change the kind of CLabel this syntax generates to be consistent with
the others. The other cmm imports use ForeignLabel with
ForeignLabelInExternalPackage. For some reason this form was using
CmmLabel. Change that to also be ForeignLabel but with
ForeignLabelInPackage. This specifies a specific package, rather
than an unnamed external package.
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a811f68f by Duncan Coutts at 2026-04-30T04:52:42-04:00
Change default cmm import statements to be internal
Previously a cmm statement like:
import foo;
meant to expect the symbol from a different shared library than the
current one.
Now it means to expect the symbol from the same shared library as the
current one. We'll add explicit syntax to indicate that it's a foreign
import. Most existing uses are in fact intenal (rts to rts), so few
imports will need to be annotated foreign. Examples would include cmm
code in libraries (other than the rts) that need to access RTS APIs.
In practice, this makes no difference whatsoever at the moment on any
platform other than windows (where building Haskell libs as shared libs
does not fully work yet), since the 'labelDynamic' treats all such
labels as foreign, irrespective of the foreign label source.
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17fe5d1d by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm import syntax 'import DATA foo;' as better name for CLOSURE
The existing syntax is:
import CLOSURE foo;
The new syntax is
import DATA foo;
This means to interpret the symbol foo as refering to data (i.e. a
global constant or variable) rather than to code (a function). The
historical syntax for this uses CLOSURE, which is rather misleading.
Presumably this was done to avoid introducing new reserved words.
Be less squemish about new reserved words and add DATA and use that.
Keep the existing CLOSURE syntax as an alias for compatibility.
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3a530d68 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm 'import extern name;' syntax
Since the default for cmm imports is now for symbols within the same
shared object, we need a way to indicate we want a symbol from an
external shared object:
import extern foo; -- for a function
import extern DATA foo; -- for data
This adds a new reserved word 'extern'.
We don't expect to have to use this much. Most cmm imports are
intra-DSO.
This makes no difference currently on ELF and MachO platforms, but does
make a difference to the linking conventions on PE (Windows).
In future it's plausible we could take make distinctions on ELF or
MachO, so it's worth trying to get it right. Windows can be the guinea
pig.
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2b8e44c7 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm syntax 'import "package" DATA foo;' for completeness
We already have:
import DATA foo; -- for data imports
import "package" foo; -- for imports from a given unitid
There's no reason not to have both at once:
import "package" DATA foo;
So add that.
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ee05e5cc by Duncan Coutts at 2026-04-30T04:52:42-04:00
Improve the commentary for the cmm import grammar.
AFAIK, this is the only place where GHC-style Cmm syntax is documented.
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b35946ad by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add a changelog.d entry for the .cmm import syntax changes
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d59b7c71 by Wolfgang Jeltsch at 2026-04-30T04:53:25-04:00
Move code that uses `GHC.Internal.Text.Read` into `base`
This contribution serves to remove all dependencies on
`GHC.Internal.Text.Read` from within `ghc-internal`, so that the
implementation of `Text.Read` and ultimately more reading-related code
can be moved to `base` as well.
The following things are moved from `ghc-internal` to `base`:
* I/O-related `Read` instances
* Most of the `Numeric` implementation
* The instance `Read ByteOrder`
* The `parseVersion` operation
* The `readConstr` operation
Metric Increase:
LinkableUsage01
T9198
T12425
T13035
T13820
T18140
- - - - -
5bd6a964 by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00
New rts Message to {set,unset} TSO flags
This commit introduces stg_MSG_SET_TSO_FLAG_info and
stg_MSG_UNSET_TSO_FLAG_info, which allows setting flags of a TSO other
than yourself.
This is especially useful/necessary to set breakpoints and toggle
breakpoints of different threads, which is needed to safely implement
features like pausing, toggling step-out, toggling step-in per thread,
etc.
Fixes #27131
-------------------------
Metric Decrease:
T3294
-------------------------
- - - - -
ce97fd3e by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00
test: Add test setting another TSO's flags
Introduces a test that runs on two capabilities. The main thread running
on Capability 0 sets the flags on a TSO running on Capability 1.
The TSO from Capability 1 itself checks whether its flags were set and
reports that back.
This validates that the RTS messages for setting TSO flags work, even if
it doesn't test a harsher scenario with race conditions to exercise why
the message passing is necessary for safely setting another TSO's flags.
Part of #27131
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a4ff6315 by David Eichmann at 2026-04-30T04:54:51-04:00
Hadrian: withResponseFile outputs response file when verbodity is Verbose
At the Verbose verbosity, shake will display full commandlines. With the
use of response files, the full command is hidden. That makes it hard to run
the command manually. This commit outputs the contents of the response
file so that that full command can be recreated and also hints at the
use of the --keep-response-files hadrian flag.
- - - - -
cd732ee3 by Duncan Coutts at 2026-04-30T04:54:51-04:00
Use response files for hadrian linking with ghc (support long command lines)
In future support for windows dynamic linking, we expect long command
lines for linking dll files with ghc. Experiments with dynamic linking the
ghc-internal library yielded a link command well over 32kb. We did not
encounter this before for static libs, since we already use ar's @file
feature (if available, which it is for the llvm toolchain).
Co-authored-by: David Eichmann <davide(a)well-typed.com>
- - - - -
3d41368f by Andreas Klebinger at 2026-04-30T04:55:32-04:00
Split GHC.Driver.Main.hs up into multiple components.
This commit splits GHC.Driver.Main into four components:
* GHC.Driver.Main.Compile
* GHC.Driver.Main.Hsc
* GHC.Driver.Main.Interactive
* GHC.Driver.Main.Passes
We might improve that separation further in the future but this should
hopefully make it easier to reason about and work with this part of the
code.
- - - - -
2128ba85 by Cheng Shao at 2026-04-30T04:56:14-04:00
compiler: avoid unique OccNames for internal Names in bytecode objects
This patch improves bytecode object serialization logic by avoiding
the construction of unique `OccName`s when serializing/deserializing
internal `Name`s. Closes #27213.
-------------------------
Metric Decrease:
LinkableUsage01
-------------------------
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e16854c3 by Vladislav Zavialov at 2026-04-30T04:56:57-04:00
Replace GHC 9.16 references with GHC 10.0
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39141343 by Alice Rixte at 2026-05-01T14:09:32+02:00
Add Bounded instances for Double, Float, CDouble and CFloat
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5c4c3bf4 by Sylvain Henry at 2026-05-02T03:39:28-04:00
testsuite: fix flaky foundation Divisible / mulIntMayOflo# tests (#27222)
Since the LCG was widened to 64 bits and the seed randomised per CI run
(commit 2d30f7d3400 "Vendor mini-QuickCheck for testsuite"), two latent
bugs in the foundation test surface stochastically:
* The Divisible property `(x `div` y) * y + (x `mod` y) == x` raises
ArithException(Overflow) when (a, b) = (minBound, -1) for fixed-width
signed Integral types. Split testNumber/testDivisible into Bounded and
unbounded variants and skip just that one pair, gated by
`(minBound :: a) < 0` so unsigned types lose no coverage.
* The `mulIntMayOflo#` test compared raw Int# bit-for-bit, but the primop
is only specified to return 0/non-zero -- the exact non-zero indicator
legitimately differs between backends and inlining choices. Add a
dedicated `testPrimopMayOflo` helper that only compares zero / non-zero.
Also fix the long-standing typo "Dividible" -> "Divisible" in identifiers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
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e242ce4f by Sylvain Henry at 2026-05-02T03:39:28-04:00
testsuite: catch and display exceptions in MiniQuickCheck
Exceptions raised while evaluating a property are now caught and reported
as a normal failure (with arguments and seed), instead of aborting the
test.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
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3b75cccd by fendor at 2026-05-02T03:40:14-04:00
Fix name of Note [Structure of dep_boot_mods]
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9a9ae4df by Duncan Coutts at 2026-05-05T14:44:37-04:00
Use __attribute__((dllimport)) for external RTS symbol declarations
This is needed to be hygenic about DLL symbol imports and exports.
The attribute is ignored on platforms other than Windows.
Use of the attribute however means that external data symbols do not
have a compile-time constant address (they are loaded using an
indirection). This means we have to adjust the rtsSyms initial linker
table so that it is a local constant in a function, rather than a global
constant. We now define it within a function that pre-populates the
symbol table with the RTS symbols.
- - - - -
2ad3e01e by Duncan Coutts at 2026-05-05T14:44:37-04:00
Fix the rts linker declarations for a few data symbols
and ensure that the (windows only) rts_IOManagerIsWin32Native data
symbol is marked as externally visible.
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8ff4fdb5 by David Eichmann at 2026-05-05T14:44:37-04:00
Hadrian: Disable runtime pseudo relocations for RTS on windows hosts
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96974723 by Teo Camarasu at 2026-05-05T14:45:20-04:00
ghci/TH: refactor to use IORef QState
This is a pure refactor and shouldn't modify semantics at all
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eff6bfaf by Teo Camarasu at 2026-05-05T14:45:20-04:00
iserv: recover/getQ/putQ should behave same as internal interpreter
The internal and external interpreter should behave the same when
handling `recover`, the exeception recovery method of Q.
In practice, they diverge. In case of failure, the internal interpreter
only restores error message state to before the computation, wheras the
external interperter restores error message state *and* the state of putQ/getQ.
As far as I can tell this is a simple mistake in the implementation.
Note [TH recover with -fexternal-interpreter] describes the correct
behaviour but the implementation doesn't mirror this.
This change restores the correct behaviour by keeping the effects of
putQ in the erroring computation.
This is a breaking change since it modifies the behaviour of programs
that rely on recover ignoring putQ from failling computations when used
with the external interpreter. Although I highly doubt anyone relies on
this behaviour.
This divergence was first introduced in d00c308633fe7d216d31a1087e00e63532d87d6d.
As far as I can tell this was unintentional and tha commit was trying to solve a different bug.
Resolves #27022
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1cb1d672 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add dynamic trace flags API
This commit adds an API to the RTS (exposed via Rts.h) that allows users to dynamically change the trace flags.
Prior to this commit, users were able to stop and start the profiling and heap profiling timers (via startProfTimer/stopProfTimer and startHeapProfTimer/stopHeapProfTimer).
This extends that functionality to also cover the core event types.
The getTraceFlag/setTraceFlag functions read and write the values of the trace flag cache, which is allocated by Trace.c, rather than modifying the members of RtsFlags.TraceFlags.
This is done under the assumption that the members of RtsFlags should not be modified after RTS initialisation.
Consequently, if the user modifies the trace flags using setTraceFlag, the object returned by getTraceFlags (from base) will not reflect these changes.
The trace flags are not protected by locks of any sort.
Hence, these functions are not thread-safe.
However, the trace flags are not modified by the RTS after initialisation, only read, so the race conditions introduced by one user modifying them are most likely benign.
This PR also puts the trace flag cache in a single global struct, as opposed to a collection of global variables, and changes the types of the individual flags from uint8_t to bool, as these have the same size on both Clang and GCC and are a better semantic match.
Prior to the change to uint8_t, they had type int, see 42c47cd6.
Even with its deprecation in C23, I don't think there should be any issue depending on stdbool.h.
The TRACE_X macros are redefined to access the global struct, with values cast to const bool to ensure they are read-only.
- - - - -
9d54dc94 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Ensure TRACE_X values are used in place of RtsFlags.TraceFlags.X
- - - - -
418d737b by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Fix nonmoving-GC tracing
The current nonmoving-GC tracing functions were written in a different
style from the other tracing functions. They were directly implemented
as, e.g., a traceConcMarkEnd function that called postConcMarkEnd.
The other tracing functions are implemented as, e.g., traceThreadLabel_,
a function that posts the thread label event, and traceThreadLabel, a
macro that checks whether TRACE_scheduler is set. This commit fixes that
implementation, and ensures that the nonmoving-GC tracing functions only
emit events if nonmoving-GC tracing is enabled.
- - - - -
99f4afa4 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add SymI_HasProto for get/setTraceFlag
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7e9eb8b9 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add SymI_HasProto for start/endEventLogging
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3a3045fb by Wen Kokke at 2026-05-06T09:53:41-04:00
rts: Add changelog entry
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a3b339a4 by Teo Camarasu at 2026-05-06T09:54:25-04:00
interface-stability/base: don't distinguish ws-32
The interface of base is identical when the Word size is 32bits.
Therefore, there is no need to have another file for this case.
So, we delete it.
Step towards: #26752
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eb922183 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Add a rts posix FdWakup utility module
This will be used to implement wakeupIOManager for in-RTS I/O managers.
It provides a notification/wakeup mechanism using FDs, suitable for
situations when a thread is blocked on a set of fds anyway. It uses the
classic self-pipe trick, or equivalently eventfd on supported platforms.
This will initially be used to implement prompt interrupt or shutdown of
the posix ticker thread.
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01b0e233 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Add prompt shutdown to the pthread ticker implementation.
The Linux timerfd ticker monitors a pipe which is used by exitTicker to
ensure a prompt wakeup and shutdown. The pthread ticker lacked this and
so would only exit at the next ticker wakeup (10ms by default).
This patch adds the same mechanism to the pthread ticker.
This changes the pthread ticker from waiting by using nanosleep() to
waiting using either ppoll() or select(), so that it can wait on both
a time and a file descriptor. On Linux at least, a test program to
compare the timing jitter of these APIs shows that using nanpsleep,
ppoll or select makes no statistical difference to the maximum or
average jitter.
This is a step towards unifying the posix ticker implementations, so
that we can have just one portable one (albeit with some limited cpp).
It is also a step towards using the ticker as part of a more general
implementation of wakeUpRts, since this will require a method to wake
the rts from a signal handler context (ctl-c handler).
- - - - -
bc41d646 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Update ticker header commentary
It was antique and didn't apply even to the previous implementation, and
certainly not to the updated one.
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4ed9a386 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Remove the timerfd-based ticker implementation
There does not appear to be any remaining advantage on Linux to using
the timerfd ticker implementation over the portable one (using ppoll on
Linux for precise timing).
The eventfd implementation was originally added at a time when Linux was
still using a signal based implementation. So it made sense at the time.
See (closed) issue #10840.
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97504fa6 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Consolidate to a single posix ticker implementation
Previously we had four implementations, two using signals and two using
threads. Having just one should make behaviour more consistent between
platforms, and should make maintenance easier.
- - - - -
1e60023b by Facundo Domínguez at 2026-05-07T18:01:16-04:00
Generalize so_inline to specify which bindings should be preserved
This commit generalizes the so_inline option of the simple optimizer
so we can indicate with a predicate the specific bindings that should
be kept.
This feature is important for the LiquidHaskell plugin, which relies on the
simple optimizer to make core programs easier to read, but needs to preserve
bindings that are relevant for verification.
See https://gitlab.haskell.org/ghc/ghc/-/issues/24386 for the full discussion.
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44cf9cd7 by Wolfgang Jeltsch at 2026-05-12T09:48:18-04:00
Move the `Text.Read` implementation into `base`
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4ac3f7d6 by Vladislav Zavialov at 2026-05-12T09:49:03-04:00
EPA: Use AnnParen for tuples and sums
Summary of changes
* Do not use AnnParen in XListTy, replace it with EpToken "[" and "]"
* Specialise AnnParen to tuple/sums by dropping the AnnParensSquare
and keeping only AnnParens and AnnParensHash
* Use AnnParen in XExplicitTuple
* Use AnnParen in XExplicitTupleTy
* Use AnnParen in XTuplePat
* Use AnnParen in XExplicitSum (via AnnExplicitSum)
* Use AnnParen in XSumPat (via EpAnnSumPat)
This is a refactoring with no user-facing changes.
- - - - -
1bdcddec by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add minimal dlltool support to ghc-toolchain
The dlltool is a tool that can create dll import libraries from .def
files. These .def files list the exported symbols of dlls. Its somewhat
like gnu linker scripts, but more limited.
We will need dlltool to build the rts and ghc-internal libraries as DLLs
on Windows. The rts and ghc-internal libraries have a recursive
dependency on each other. Import libraries can be used to resolve
recursive dependencies between dlls. We will use an import library for
the rts when linking the ghc-internal library.
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f7fc3770 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add minimal dlltool support into ./configure
Find dlltool, and hopefully support finding it within the bundled llvm
toolchain on windows.
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e4e22bfb by Duncan Coutts at 2026-05-12T09:49:48-04:00
Update the default host and target files for dlltool support
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5666c8f9 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add dlltool as a hadrian builder
Optional except on windows.
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5e14fe3f by Duncan Coutts at 2026-05-12T09:49:48-04:00
Update and generate libHSghc-internal.def from .def.in file
The only symbol that the rts imports from the ghc-internal package now
is init_ghc_hs_iface. So the rts only needs an import lib that defines
that one symbol.
Also, remove the libHSghc-prim.def because it is redundant. The rts no
longer imports anything from ghc-prim.
Keep libHSffi.def for now. We may yet need it once it is clear how
libffi is going to be built/used for ghc.
- - - - -
3d91e4a6 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add rule to build libHSghc-internal.dll.a and link into the rts
On windows only, with dynamic linking.
This is needed because on windows, all symbols in dlls must be resolved.
No dangling symbols allowed. References to external symbols must be
explicit. We resolve this with an import library. We create an import
library for ghc-internal, a .dll.a file. This is a static archive
containing .o files that define the symbols we need, and crucially have
".idata" sections that specifies the symbols the dll imports and from
where.
Note that we do not install this libHSghc-internal.dll.a, and it does
not need to list all the symbols exported by that package. We create a
special purpose import lib and only use it when linking the rts dll, so
it only has to list the symbols that the rts uses from ghc-internal
(which is exactly one symbol: init_ghc_hs_iface).
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c8dae539 by Alice Rixte at 2026-05-12T09:50:52-04:00
Script for downloading and copying `base-exports` file
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5fab2238 by Wolfgang Jeltsch at 2026-05-12T21:24:27+03:00
Introduce a cache of home module name providers
This contribution introduces to the module graph a cache that maps home
module names to sets of units providing them and changes the finder to
use that cache. This is a performance optimization, especially for
multi-home-unit builds.
The particular changes are as follows:
* In `GHC.Unit.Module.Graph`, `ModuleGraph` is extended with a new
field `mg_home_module_name_providers_map`, exposed as
`mgHomeModuleNameProvidersMap`. This is a cache that assigns to each
home module name the set of IDs of home units that define it.
Operations that construct module graphs are updated such that this
cache stays synchronized.
* In `GHC.Unit.Finder`, `findImportedModule` is changed to pull
`mgHomeModuleNameProvidersMap` from `hsc_mod_graph` and pass it to
`findImportedModuleNoHsc`, which now does not search home units in
arbitrary order but prioritizes those units that the cache mentions
as potential providers of the requested module.
In addition, this contribution adds variants of the two multi-component
compiler performance tests that use 100 units instead of 20, because
with just 20 units the benefits from caching of home module name
providers are still negligible.
The following table shows the total time needed for running both
multi-component tests before and after this contribution and with
different numbers of units:
| # of units | Before | After |
|-----------:|-------:|------:|
| 20 | 0:12 | 0:12 |
| 100 | 0:47 | 0:42 |
| 200 | 3:05 | 2:08 |
Note that there seems to be a general overhead of 12 seconds that is not
attributable to the actual tests, so that the real running times should
be 12 seconds smaller than shown above.
Resolves #27055.
Metric Decrease:
MultiComponentModules
MultiComponentModulesRecomp
Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com>
Co-authored-by: Fendor <fendor(a)posteo.de>
- - - - -
38b76b2f by Cheng Shao at 2026-05-13T17:48:48-04:00
testsuite: mark T22159 as fragile
This patch marks T22159 as fragile on Windows for issue described in #27248.
Before we get to the bottom of those failures, this unblocks newer
Windows runners.
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50188615 by Ian Duncan at 2026-05-14T13:45:07+02:00
AArch64: use ASR not LSR for MO_U_Shr at W8/W16
The unsigned right shift (MO_U_Shr) for sub-word widths (W8, W16)
with a variable shift amount was emitting ASR (arithmetic/signed shift
right) after zero-extending with UXTB/UXTH. This should be LSR
(logical/unsigned shift right). After zero-extension the upper bits
happen to be 0 so ASR produces the same result, but it is semantically
wrong and would break if the zero-extension were ever optimized away.
Includes assembly output test (grep for lsr) and runtime test
verifying unsigned right shift of Word8 and Word16 values.
- - - - -
28666fbf by Vladislav Zavialov at 2026-05-19T12:44:05-04:00
Add type families: Tuple, Constraints, Tuple#, Sum# (#27179)
These type families map tuples of types to the corresponding Tuple<N>,
Tuple<N>#, CTuple<N>, and Sum<N># types. Some examples at N=2:
Tuple (Int, Bool) = Tuple2 Int Bool
Constraints (Show a, Eq a) = CTuple2 (Show a) (Eq a)
Tuple# (Int#, Float#) = Tuple2# Int# Float#
Sum# (Int#, Float#) = Sum2# Int# Float#
See GHC Proposal #145 "Non-punning list and tuple syntax".
To make the Sum# instance at N=64 possible, this patch also introduces
the Sum64# constructor declaration and bumps mAX_SUM_SIZE from 63 to 64.
Metric Increase:
ghc_experimental_dir
- - - - -
41c2448b by Wen Kokke at 2026-05-19T12:44:53-04:00
rts: Add IPE event class for -l
This commit adds a new IPE event class to the -l RTS flag.
Previously, IPE events were enabled unconditionally.
However, the IPE events can easily grow to hundreds or thousands of megabytes.
With the new event class you can pass, e.g., -l-I to disable IPE events.
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62536551 by Wen Kokke at 2026-05-19T12:44:53-04:00
ghc-internal: Add TraceFlags.traceIPE
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e45312d1 by Wen Kokke at 2026-05-19T12:44:53-04:00
testsuite: Add test for TraceFlags.traceIpe
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4768d9aa by Wen Kokke at 2026-05-19T12:44:53-04:00
ghc-internal: Add DebugFlags.ipe
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bc1b5c69 by Wen Kokke at 2026-05-19T12:44:53-04:00
testsuite: Add test for DebugFlags.ipe
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0da1543f by Duncan Coutts at 2026-05-19T12:45:37-04:00
Document removal of the signal-based interval timer
Update mentions within the RTS section of the users guide.
Add a changelog entry.
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b2911514 by Duncan Coutts at 2026-05-19T12:45:37-04:00
Fix section for an recent changelog entry
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d6d76a7a by David Eichmann at 2026-05-19T12:46:19-04:00
ghc-toolchain: implement llvm program versioning logic
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2dd36fa3 by Wolfgang Jeltsch at 2026-05-20T04:49:52-04:00
Turn `Trustworthy` into `Safe` in `base` where possible
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f4399dd1 by Wolfgang Jeltsch at 2026-05-20T04:50:37-04:00
Make the current `base` buildable with GHC 10.0
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1a7de232 by Duncan Coutts at 2026-05-20T12:26:25-04:00
Hadrian: remove legacy rts .so symlinks
For compatibility with the old makefile based build system, hadrian had
rules to generate symlinks from unversioned to versioned names for the
rts .so/.dynlib file, like libHSrts-ghcx.y.so -> libHSrts-1.0.3-ghcx.y.so
We no longer need these symlinks since the makefile build system has
been retired some time ago. The need for these symlinks is awkward on
windows where we cannot (in practice) create symlinks. So rather than
make them conditional (non-windows), just remove them entirely.
- - - - -
286f1adf by fendor at 2026-05-20T12:27:09-04:00
Fix regression T27202: `:load` and `:add` work in GHCi
To fix the regression there are conceptually two major things that we
fix:
* We don't remove the `importDirs` from `interactive-session`
* When `:add`ing a module, we don't try to find them via PackageImports
* The PackageImport is wrong as we can't know the package-name at
this stage in ghc/UI.hs
What does it mean to not remove the `importDirs` from
`interactive-session`?
It means that, given some initial `DynFlags`, we will use those
`importDirs` in `interactive-session`.
The initial `DynFlags`, however, depend on how you initialise the GHC
session.
For a simple session, initialised by
ghc -isrc -this-unit-id main
It is simple, just use the `DynFlags` given on the cli.
Thus, `main` and `interactive-session` will have the same `DynFlags`,
except for the `homeUnitId` and `interactive-session` depends on `main`
by construction of the GHCi session.
What about a multiple home unit session, though?
ghc -unit @unit1 -unit @unit2
What are the `DynFlags` in this cli invocation? It shouldn't be either
`@unti1` nor `@unit2`, as the order shouldn't matter or any other
implicit condition.
For consistency, we decide that the initial `DynFlags` are the top
`DynFlags` on the cli, ignoring `-unit` flags.
Thus, in this example, there are no `importsDirs` regardless of what we
might find in `@unit1` and `@unit2`.
But in this invocation:
ghc -isrc -unit @unit1 -unit @unit2
The `interactive-session` will have the `importsDirs` `src`.
Note, `-isrc` will be inherited in `@unit1` and `@unit2`, so you need to
explicitly use `-i` to clear the `importsDirs`, in order to avoid
accidentally adding `src` as an import directory to all other home
units.
This fix has been made possible by the improvements introduced in
!15888, which avoids ambiguity when a home unit shares the `importsDirs`
with the `interactive-session`, on top of being much faster for multiple
home units.
Adds regression tests for T27202 for `:load`ing and `:add`ing modules
that are located in import directories.
- - - - -
728662de by fendor at 2026-05-20T12:27:09-04:00
Use home unit package db stacks in GHCi prompt and session unit
In order to import modules from home unit dependencies (e.g., `Data.Map`),
the ghci prompt unit needs to populate its `UnitState`.
This is tricky to handle correctly, which `PackageDBFlag`s should we use
to populate the `UnitState`?
We decide, the most intuitive solution for users is to depend on all
`PackageDBFlag`s, so that any dependency can be imported in GHCi.
This assumes consistency in the `PackageDBFlag`s, so no two home units
specify `PackageDBFlag`s that are inconsistent with each other.
We could simply concat all the `PackageDBFlag`s of the existing home
units, but later `PackageDBFlag`s shadow earlier ones, leading to the
last processed home units' `PackageDBFlag`s to shadow the earlier ones.
This is hard to fix, we need to give users the capability to provide ghc
options for the ghci prompt home unit.
However, as this is considerably more work, we decided on an
approximation that should work out most of the time.
Package Db stacks in cabal and stack follow a certain structure:
-no-user-package-db > -package-db $cabal-store > -package-db $local-db
The first two arguments are always the same, namely the
`-no-user-package-db` and `-package-db`.
We compute the longest common prefix over all home units, and use that
as the start of the package db stack. Then, over the rest of the
`PackageDBFlag`s, we simply take the union and append them to our
initial stack.
We assume, that the rest of package dbs only defines very few, "local"
units that are usually not shadowing each other.
This allows us to get a relatively consistent package database stack for
the ghci prompt home unit.
Similar reasoning applies to the session unit in order to add modules to
the session and have dependencies available in the module.
We do something similar for `-package` flags, to make sure only the
correct units are actually visible in the ghci session.
This time, we simply take the union of all `PackageFlag`s, allowing us
to import modules from the home unit dependencies.
In the future, it would be beneficial to allow the user to provide the
exact ghc options to control the visibilities. For now, this will have
to do.
- - - - -
740d89a0 by Simon Peyton Jones at 2026-05-20T17:20:44-04:00
Do not use mkCast during typechecking
This commit fixes #27219. The problem was that the typechecker was using
`mkCast`, whose assertion checks legitimately fail when applied to types
that contain unification variables.
- - - - -
a50fdb06 by Simon Peyton Jones at 2026-05-20T17:20:45-04:00
Major refactor of the Simplifier
The main payload of this patch is to refactor the Simplifer to avoid
repeated simplification when using Plan (AFTER) for rule rewrites.
The need for this was shown up by #26989.
See Note [Avoid repeated simplification] in GHC.Core.Opt.Simplify.Iteration.
Related refactoring:
* Refactor the two fields `sc_dup` and `sc_env` in `ApplyToVal` into one, `sc_env`.
Reason: the envt is irrelevant in the "simplified" case, so the data type describes
the possiblitiies much more accurately now.
* Some refactoring in `knownCon` to split off `wrapDataConFloats`.
* Refactor `lookupRule` and its auxiliary functions to return `RuleMatch`,
a new data type. See Note [data RuleMatch] in GHC.Core. Ditto for BuiltinRule.
This RuleMatch returns fragments of the target in rm_args and rm_floats,
leaving `rm_rhs` to be the stuff from the RULE itself.
Doing this has routine consequences in GHC.Core.Opt.ConstantFold. Many changes
there but all routine.
* When doing occurrence analysis on RULEs, make the occ-info on the rule
binders relate just to the RHS, not the LHS. See (OUR1) in
Note Note [OccInfo in unfoldings and rules]
This means that Lint must not complain about the fact that the patterns
in the RULE mentions binders that are marked dead.
See Note [Dead occurrences] in GHC.Core.Lint.
I changed the Core pretty-printer so that it didn't suppress dead binders,
else I can't see those binders in RULEs. That led to quite a lot of testsuite wibbles.
* Refactor FloatBinds, so that it is used both by
`exprIsConApp_mabye` and by `lookupRule`
* Move the definition of FloatBinds out of GHc.Core.Make, into GHC.Core.
* Add FloatTick as an extra constructor.
* Refactor `lookupRule` to use `FloatBinds` instead of `BindWrapper`.
This refactor just shares more code.
(Rename GHC.Core.Opt.FloatOut.FloatBinds to FloatLets, to avoid gratuitious
name clash with GHC.Core.FloatBinds.)
Corecion optimisation
* In simpleOpt, when composing coercions, call new function `optTransCo`.
This is much lighter weight than full blown coercion optimisation.
* Make `GHC.Core.Opt.Arity.pushCoValArg` and `pushCoTyArg` return the
coercionLKind of the coercion. This saves recomputing that coercionLKind
at the key call sites in GHC.Core.Opt.Simplify.Iteration.pushCast.
* Rename `addCoerce` in GHC.Core.Simplify.Iteration to become `pushCast`.
* In the `ApplyToVal` case of `pushCast` we had a very unsavoury call to `simplArg`.
I eliminated it by adding a field `sc_cast` to `ApplyToVal` that records any
pending casts. Much nicer now. See Note [The sc_cast field of ApplyToVal].
* Don't optimise coercions if the type-substitution is empty.
See Note [Optimising coercions] in GHC.Core.Opt.Simplify.Iteration.
The fix for #26838 is dramatic. For the test in perf/compiler/T26839 we have
Compiler allocs: Before: 7,363M
After: 688M
Compile time goes down generally. Here are compiler-alloc changes
over 0.5%:
CoOpt_Read(normal) 729,184,920 -0.7%
CoOpt_Singletons(normal) 666,916,960 -4.6% GOOD
LargeRecord(normal) 1,227,056,876 +1.1%
T12227(normal) 256,827,604 -4.6% GOOD
T12425(optasm) 76,879,410 -0.8%
T12545(normal) 787,826,918 -10.8% GOOD
T12707(normal) 775,186,464 -0.9%
T13253(normal) 318,599,596 -0.8%
T14766(normal) 685,857,320 -1.0%
T15304(normal) 1,123,333,422 -2.2%
T15630(normal) 123,142,330 -2.6%
T15630a(normal) 123,092,100 -2.6%
T15703(normal) 299,751,682 -2.9% GOOD
T17516(normal) 964,072,280 +1.0%
T18223(normal) 367,016,820 -6.2% GOOD
T18730(optasm) 130,643,770 -3.3% GOOD
T20261(normal) 535,608,584 -0.7%
T21839c(normal) 340,340,436 -0.9%
T24984(normal) 85,568,392 -1.9%
T3064(normal) 174,631,992 -1.2%
T3294(normal) 1,215,886,432 -0.7%
T5030(normal) 141,449,704 -17.2% GOOD
T5321Fun(normal) 258,484,744 -1.9%
T8095(normal) 770,532,232 -2.7%
T9630(normal) 858,423,408 -14.5% GOOD
T9872c(normal) 1,591,709,448 +0.7%
info_table_map_perf(normal) 19,700,614,458 -1.3%
geo. mean -0.7%
minimum -17.2%
maximum +1.1%
However, strangely there seems to be a 5.0% increase in CoOpt_Read in
the x86_64-linux-fedora43-validate+debug_info+ubsan job, although
there generally a /decrease/ in this test in other builds. The baseline
value looks strange. Anyway I'll just accept it.
Metric Decrease:
CoOpt_Singletons
T12227
T12545
T12707
T15703
T18223
T18730
T21839c
T5030
T9630
Metric Increase:
CoOpt_Read
- - - - -
834623d4 by Mrjtjmn at 2026-05-20T17:21:41-04:00
users-guide: Fix weird notation in "Summary of stolen syntax"
- - - - -
6f9d7c71 by Markus Läll at 2026-05-21T15:25:34-04:00
Use "grimily" instead of "grimly"
Fixes https://gitlab.haskell.org/ghc/ghc/-/issues/27221
- - - - -
50e999ca by fendor at 2026-05-21T15:26:18-04:00
Speed up 'closure' computation in `ghc-pkg`
Cache the set of already seen `UnitId`s and use `Set` operations to
speed up 'closure' computation.
Further simplify the implementation of 'closure' to account for the
actual usage.
As a consequence, we rename 'closure' to 'brokenPackages' to reflect its
purpose better after the simplification.
- - - - -
7ecc6184 by sheaf at 2026-05-21T15:27:10-04:00
TcMPluginHandling: be more lenient when no plugins
This change ensures that, if a function such as 'typecheckModule' was
invoked with 'NoTcMPlugins', GHC doesn't spuriously complain about TcM
plugins having already been stopped, as there were none to start with.
- - - - -
72c8de5c by Simon Jakobi at 2026-05-23T18:41:42-04:00
Implement List.elem via foldr
...in order to allow specialization to Eq instances.
The implementation of notElem is updated for consistency.`
Corresponding CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/412
Addresses #27096.
- - - - -
3268c610 by Alan Zimmerman at 2026-05-23T18:42:30-04:00
EPA: Fix span for qualified multiline string
Fix the span for a qualified multiline string like
Text."""
I'm a multiline
Text value
!
"""
to extend to the end of the entire string, not just the first line.
Closes #27274
- - - - -
1f096790 by Alan Zimmerman at 2026-05-23T18:43:20-04:00
EPA: Fix exact printing namespace-specified wildcards
Ensures correct printing of imports of the form
import Data.Bool (data True(data ..))
import Data.Bool (data True(type ..))
Closes #27291
- - - - -
56ada7c0 by Mrjtjmn at 2026-05-23T18:44:19-04:00
Fix ambiguous syntax of BangPatterns in users guide
Update documentation for the BangPatterns extension to specify
how surrounding whitespace affects interpretation of `!`.
* Only when there is whitespace before `!` and no whitespace after,
it is recognized as a BangPattern.
* Other cases `⟨varid⟩!⟨varid⟩`, `⟨varid⟩ ! ⟨varid⟩`, `⟨varid⟩! ⟨varid⟩`
are treated as infix operators.
- - - - -
579aa0b7 by Simon Jakobi at 2026-05-25T16:31:26-04:00
Ensure that SetOps.{minusList,unionListsOrd} can be specialized
...by marking them INLINABLE. Haddock allocates 0.1–0.3% less as a
result.
This also removes some redundant constraints on unionListsOrd.
- - - - -
cccf45da by Cheng Shao at 2026-05-25T16:32:13-04:00
wasm: ensure post-linker output is synchronous ESM
This patch fixes wasm backend's post-linker output script to ensure
it's synchronous ESM and doesn't use top-level await, which doesn't
work in ServiceWorkers. Fixes #27257.
- - - - -
8db331a3 by Zubin Duggal at 2026-05-26T04:54:03-04:00
Update to semaphore-compat 2.0.0 using v2 of the protocol
On Linux and other POSIX platforms, GHC's -jsem jobserver client now
speaks v2 of the semaphore-compat protocol, which uses Unix domain
sockets in place of POSIX named semaphores. This avoids the libc-ABI
issues that affected the old implementation. Windows is unaffected
and continues to use the v1 protocol (Win32 named semaphores); its
reported protocol version remains v1.
When GHC receives a -jsem name whose protocol version it does not
support, it emits a -Wsemaphore-version-mismatch warning and falls
back to -j<N> rather than crashing. ghc --info exposes the supported
version in a new "Semaphore version" entry so cabal-install can detect
a mismatch before invoking GHC.
Users on a cabal-install that predates the v2 update will continue to
build successfully on Linux/POSIX, but will lose the cross-process
-jsem coordination and fall back to -j<N> per GHC invocation. Users
must upgrade to a cabal-install that supports protocol v2 to recover
full parallelism.
Also fix a leak in cleanupSem (#27253): cleanupSem used to snapshot
heldTokens and release them before killing the loop, while the loop's
in-flight acquire/release children could still be mutating it.
Cleanup now runs inside the loop's own exit handler, after draining
the active child via a new activeChild TVar, so the snapshot has no
concurrent mutator.
See also:
- GHC proposal amendment: https://github.com/ghc-proposals/ghc-proposals/pull/673
- cabal-install patch: https://github.com/haskell/cabal/pull/11628
- semaphore-compat MR: https://gitlab.haskell.org/ghc/semaphore-compat/-/merge_requests/8
Bump semaphore-compat submodule to 2.0.0
Fixes #25087 and #27253
- - - - -
17be4f1f by Alan Zimmerman at 2026-05-26T04:54:52-04:00
EPA: Record semicolons in HsModifier
Ensure the semi colons are captured in the ParsedSource for code like
%True;; %False;
instance C D
It makes HsModifier (and hence HsModifierOf) LocatedA, so the semi
colons can be recorded as [TrailingAnn]
Also rename pprHsModifiers to pprLHsModifiers to match.
Closes #27294
- - - - -
8f991755 by fendor at 2026-05-26T11:02:52-04:00
Revert prog003 acceptance
We thought the commit 286f1adff3e78d775ff325caff71d0cee25d710b fixed the
test, but due to changes to ghci, modules loaded during the GHCi
session, the test was actually no longer testing what it set out to do,
"fixing" the broken test.
As modules are added to the `interactive-session` home unit, the object code needs
to be compiled with `-this-unit-id interactive-session`, otherwise the
object code won't be used.
Once this has been fixed in the test, the test fails as expected again.
- - - - -
277a3687 by mangoiv at 2026-05-26T11:03:40-04:00
libraries/process: bump submodule to v1.6.29.0
This submodule bump resolves a segfault on macos 15.
Fixes #27144
- - - - -
6779bb0c by mangoiv at 2026-05-26T11:03:40-04:00
libraries/unix: in submodule, don't pick branch 2.7
The 2.7 branch is outdated and the module has been advanced far beyond
it anyway, so remove that line.
- - - - -
4a645683 by Simon Peyton Jones at 2026-05-27T21:41:59-04:00
Trim the continuation in mkDupableContWithDmds
When there are no remaining argument demands, it means the application
is bottoming. In this case, we can trim the continuation to avoid the
panic that was observed in #27261.
See Note [Trimming the continuation for bottoming functions] in
GHC.Core.Opt.Simplify.Iteration.
- - - - -
8ab506ff by Cheng Shao at 2026-05-27T21:42:47-04:00
ghci: fix module name string lifetime in hs_hpc_module invocation
This patch makes hpcAddModule pass a properly malloced module name
string to hs_hpc_module, instead of using useAsCString which causes
use-after-free of module name string. Fixes #27297.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
b0233814 by sheaf at 2026-05-27T21:43:31-04:00
Relax acceptance threshold for T10421
As seen in #27289, the 1% acceptance threshold for this text was
overly narrow, resulting in spurious test failures. This commit widens
the acceptance threshold to 2%. Fixes #27289.
- - - - -
63ce5770 by Luite Stegeman at 2026-05-28T12:23:35-04:00
Fixes for black holes
- suspend duplicate work for eager black holes
- detect eager black holes in checkBlockingQueues
- don't overwrite existing black holes even if they're not
in an eager blackhole frame
- don't deadlock on self when thunk is already blackholed
Fixes #26936
- - - - -
037a80dc by Tom McLaughlin at 2026-05-28T12:24:36-04:00
Event/Windows.hsc: rethrow exceptions in overlapped IO
This prevents the WinIO manager from swallowing exceptions in overlapped IO. It
was added to make WinIO support possible in the `network` library. See
https://gitlab.haskell.org/ghc/ghc/-/issues/27283.
We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP.
- - - - -
2d53bcdb by Wolfgang Jeltsch at 2026-05-28T12:25:21-04:00
Allow `downsweep` to use nodes of an existing module graph
To this end, `downsweep` has not been able to use the nodes of a module
graph obtained from a previous downsweeping round. In some GHC API
applications, downsweeping is performed somewhat incrementally and
therefore could profit from reusing such existing results. This
contribution makes this possible.
Resolves #27054.
Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com>
- - - - -
f4fbb583 by Simon Jakobi at 2026-05-28T12:26:04-04:00
Add regression test for T11226
Closes #11226.
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ed29a5e6 by Sven Tennie at 2026-05-28T17:30:36-04:00
Add optional config setting for LibDir (#19174)
Previously, the `libDir` was derived from `topDir`. This won't work for
inplace stage2 cross-compilers where binaries and libraries are in
different stage dirs (`_build/stage1/` for executables and
`_build/stage2` for libraries).
`LibDir` is set in the inplace `settings` files. For bindists, we
generate a new `settings` file with no `LibDir` entry. GHC then defaults
to use `topDir` as `libDir` again. This keeps the bindist relocatable.
If `LibDir` is a relative path, it is interpreted relatively to
`topDir`.
The global package db is part of the `lib/` folder. If we want to point
for inplace cross-compilers to the succeeding stage's folder, this is
done by setting `LibDir`. Thus, the global package db must be found
relative to `libDir`` (which may default to `topDir` or be set by
`LibDir`).
The complexity of settings becomes scary. So, add a test to ensure
`LibDir` works as expected.
- - - - -
8339cf8f by Sven Tennie at 2026-05-28T17:30:36-04:00
Add Haddock to FileSettings
Helping to understand the fields' meanings without deeper analyses.
- - - - -
4ce251e4 by Sylvain Henry at 2026-05-28T17:31:39-04:00
foundation test: skip signed minBound `quot` (-1) (#27222)
`minBound `quot` (-1)` for fixed-width signed integers is platform
dependent: the mathematical result -minBound is not representable in
the type. On x86, IDIV traps; LLVM's sdiv is undefined behaviour in
this case; on AArch64/RISC-V, SDIV wraps to minBound.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
b8ba7e61 by Simon Jakobi at 2026-05-28T17:32:23-04:00
Prevent dictionary-passing in checkTyEqRhs
...by pre-specializing it to TcM.
Previously, wherever checkTyEqRhs was used in other modules, the
Core showed dictionary passing ($fMonadIOEnv). The added SPECIALIZE
pragma prevents this.
- - - - -
d603477f by David Eichmann at 2026-05-29T13:17:12-04:00
Hadrian: create a ghc-internal .def file per ghc-internal dll
The .def file generated from rts/win32/libHSghc-internal.def.in contains
the name of the ghc-internal dll. The correct dll name differs based
on if the dll is inplace/final and if using the Dynamic way. Previously,
this was not accounted for and inconsistent dlls names where used. That
led to failure when loading dlls at runtime in experiments with windows
dynamic linking.
- - - - -
1fc21753 by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: copy backend interface haddocks to Native backend (#27305)
The haddock comments documenting the BigNat backend interface (function
contracts, expected MutableWordArray# sizes, return-value semantics, etc.)
were attached to the FFI backend module. Copy them to the Native backend
so they remain in tree once the FFI backend is removed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
717059df by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: remove FFI backend (#27305)
The FFI backend of ghc-bignum (now part of ghc-internal) had no known
users and is easy to recreate by relinking ghc-internal with a custom
backend. Remove the backend module, the bignum-ffi cabal flag, and the
ffi option from Hadrian's --bignum selector. The backend interface
documentation now lives in the Native backend module.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
4bb3b1d8 by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: remove Check backend (#27305)
The Check backend of ghc-bignum (now part of ghc-internal) compared the
selected backend's output against the Native backend for validation.
It had no known users. Remove the backend module, the bignum-check
cabal flag, the bignumCheck Hadrian flavour field, and the check-
prefix in Hadrian's --bignum selector.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
6b3044a0 by David Eichmann at 2026-05-30T11:58:48-04:00
Add code comments to allocator code
- - - - -
f4e04210 by Matthew Pickering at 2026-05-30T11:59:34-04:00
hadrian: Refactor system-cxx-std-lib rules
I noticed a few things wrong with the hadrian rules for
`system-cxx-std-lib` rules.
* For `text` there is an ad-hoc check to depend on `system-cxx-std-lib`
outside of `configurePackage`.
* The `system-cxx-std-lib` dependency is not read from cabal files.
* Recache is not called on the packge database after the `.conf` file is
generated, a more natural place for this rule is `registerRules`.
Treating this uniformly like other packages is complicated by it not
having any source code or a cabal file. However we can do a bit better
by reporting the dependency firstly in `PackageData` and then needing
the `.conf` file in the same place as every other package in
`configurePackage`.
This commit increases the `shakeVersion`, to provide backwards
compatibility to previous builds with different PackageData.
Fixes #25303
Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com>
- - - - -
576987d0 by Simon Jakobi at 2026-06-02T04:53:36-04:00
compiler: use nubOrd from containers
Address #27103 by replacing GHC.Utils.Misc.ordNub[On] with
Data.Containers.ListUtils.nubOrd[On].
Note that nubOrd suffers from a small inefficiency, a fix for which
will be included in the next containers release:
https://github.com/haskell/containers/issues/1202
- - - - -
deea53c3 by David Eichmann at 2026-06-02T04:54:22-04:00
Hadrian: disable response files for GHC/Haddock builders on non-Windows
This makes debugging build errors easier on non-windows hosts.
See issue #27230
- - - - -
f2f5c6ba by Nikita Efremov at 2026-06-02T16:04:54+00:00
fix typo : compete with performance, not complete
- - - - -
5524ea0e by Wolfgang Jeltsch at 2026-06-03T08:01:26-04:00
Make the current `base` buildable with GHC 9.14
This comprises the following changes:
* Disable some imports into `GHC.Base` for GHC 9.14
* Disable some imports into `Prelude` for GHC 9.14
* Disable separate `ArrowLoop` import for GHC 9.14
* Disable `GHC.Internal.STM` import for GHC 9.14
* Disable `GHC.Internal.Unicode.Version` import for GHC 9.14
* Disable `GHC.Internal.TH.Monad` import for GHC 9.14
* Add alternative `fixIO` import for GHC 9.14
* Add alternative `unsafeCodeCoerce` import for GHC 9.14
* Disable hiding of imported SIMD operations for GHC 9.14
* Disable use of GHC 9.14’s `printToHandleFinalizerExceptionHandler`
* Enable use of `getFileHash` from `ghc-internal` for GHC 9.14
* Make `thenA` available for GHC 9.14
* Make `thenM` available for GHC 9.14
* Disable translation of `IoManagerFlagPoll` for GHC 9.14
* Add `hGetNewlineMode` for GHC 9.14
- - - - -
d3438055 by Enrico Maria De Angelis at 2026-06-03T08:02:17-04:00
Fix #27067 - Clarify haddocks on `minusNaturalMaybe`
- - - - -
f9bcfac2 by sheaf at 2026-06-03T14:47:19-04:00
Avoid mkTick in Core Prep breaking ANF
As discovered in #27182, mkTick can break ANF. This patch introduces a
variant of mkTick that skips the single optimisation that could break
ANF. This is preferrable over switching to the raw Tick constructor,
as the latter may introduce spurious cost centres in profiling reports.
This is a temporary measure until we more thoroughly refactor how
mkTick works (see #27141).
See Note [mkTick breaks ANF] in GHC.CoreToStg.Prep.
Fixes #27182
- - - - -
cf1fd661 by Artem Pelenitsyn at 2026-06-03T14:48:09-04:00
clarify comment for getSizeofMutableByteArray#: we get the size in bytes, not "elements"
- - - - -
a3b431f3 by David Eichmann at 2026-06-04T10:10:19+00:00
Hadrian: convert env variable ACLOCAL_PATH to unix paths.
Convert ACLOCAL_PATH to a unix style path when invoking autoreconf.
Autoreconf doesn't handle windows paths.
See Note [Autoreconf unix paths from ACLOCAL_PATH].
Fixes #27311
- - - - -
18f6138a by Simon Jakobi at 2026-06-04T20:20:31-04:00
testsuite: Deduplicate --only test names
config.only is assumed to be a set, but supplying --only overwrote it
with the (list) argparse result, which can contain duplicates. When a
test ran, config.only.remove(name) dropped only the first occurrence,
so a duplicated name lingered and was later misreported as a
"test not found" framework failure. Store it as a set instead.
Fixes #27322
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
2f3cc9ff by Simon Jakobi at 2026-06-08T07:55:49-04:00
testsuite: detect fast bignum via ghc-internal, not removed ghc-bignum
The ghc-bignum package was merged into ghc-internal, so the BIGNUM_GMP
probe in test.mk ran `ghc-pkg field ghc-bignum exposed-modules`, which
fails with "cannot find package ghc-bignum". That error went to stderr
and leaked into the captured stderr of every makefile_test, causing
spurious [bad stderr] failures across the suite. The probe also silently
returned empty, so config.have_fast_bignum was wrongly False even on GMP
builds.
Probe ghc-internal's extra-libraries for the gmp library instead: the
GMP backend module is an other-module (not exposed), but GMP_LIBS adds
gmp to extra-libraries only on a GMP build, so this distinguishes the
backends. Redirect stderr to keep any future missing-package error off
the harness's stderr.
This also removes a stale comment as per suggestion from hsyl20.
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
eb3bf6e7 by Alan Zimmerman at 2026-06-08T07:56:32-04:00
EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas
This now matches what it actually does.
- - - - -
498bb21a by David Eichmann at 2026-06-09T18:02:39-04:00
Hadrian: avoid response files when command line is short enough
This replaces the logic of always using response files on Windows.
With the new condition based on command line lenght, reponse files
can be avoided in many more cases (on windows).
Now that response files are only used in a small number of cases,
response files are always kept and the -r / --keep-response-files
command line options have been removed
The response file paths are nolonger randomized. They are placed in the
`_build/rsp` directory. This ensures they are ignored by git and we
that Hadrian reuses response file paths when rebuilding rather than
leaving stale response files around.
Update user guide putting response files in its own section
- - - - -
87f510a5 by Simon Hengel at 2026-06-09T18:03:25-04:00
Don't use non-breaking spaces
- - - - -
41a19379 by David Eichmann at 2026-06-09T18:04:11-04:00
Hadrian: remove unused wrapper scripts from windows bindist
These wrapper scripts are only installed on non-relocatable builds
which are not generally supported on windows.
- - - - -
ce01ccb6 by sheaf at 2026-06-10T05:08:48-04:00
Don't drop ticks around variables of type `IO ()`
GHC.Core.Utils.mkTick is responsible for placing a tick on a Core
expression. It contains logic for dropping SCCs (non-counting profiling
ticks) around non-function variables, as such variables cannot
meaningfully contribute to profiles. However, the logic for what counts
as a function was incorrect: it used `isFunTy` which returns 'False' for
types such as 'IO ()' where the function arrow is hidden under a
newtype.
We now use 'mightBeFunTy' instead of 'isFunTy'. This ensures we don't
drop ticks in cases we aren't sure.
On the way, we improve the documentation of 'isFunTy', 'isPiTy' and
'mightBeFunTy', and update the latter's implementation to consistently
handle unary classes.
Fixes #27225
-------------------------
Metric Decrease:
T5642
-------------------------
- - - - -
d311c4f1 by Simon Jakobi at 2026-06-10T05:09:32-04:00
testsuite: Add regression test for #4081
Check that a strict constructor field is unboxed once outside an
enclosing loop, not re-inspected each iteration (the float-out
case-floating from 9cb20b488). Uses simonpj's `data T a = T !a` example
from the ticket; T4081.stderr captures the expected Core.
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
333df444 by sheaf at 2026-06-10T05:10:25-04:00
Check for cabal-install >= 3.12 upfront
Starting with commit 8cb99552f607f6bc4000e45ab32532d50c8bb996, Hadrian
requires cabal-install >= 3.12 in order to use the 'cabal path' command
that was introduced in version 3.12, as per
https://github.com/haskell/cabal/blob/a51c4ee1556d816ad86e90db7e6330dd51b0b…
This was not reflected in the Hadrian build script, causing a delayed
build failure instead of enforcing the version requirement upfront,
which this patch does.
Fixes #27317
- - - - -
98c20394 by sheaf at 2026-06-10T05:11:09-04:00
Fix crash in Data.Data instance for HsCtxt
The Data.Data instance for HsCtxt contained an error for the 'toConstr'
method, which could trigger for example when looking at -ddump-tc-ast
traces. Replace it with the 'abstractConstr' pattern used in the rest of
the codebase.
- - - - -
5ac9ce7d by Zubin Duggal at 2026-06-10T21:26:32+05:30
hadrian: Remove old package.conf files when generating new ones
Old package.conf files might exists with different hashes, causing issues like #26661
Fixes #26661
- - - - -
c9015f09 by sheaf at 2026-06-11T12:40:28-04:00
Fix AArch64 clobbering bug for MUL2
On AArch64, the code generator could clobber one of the input operands
when computing the lower bits of a MUL2 operation. This rendered invalid
the subsequent computation of the high bits.
This commit fixes that by using a temporary register. The register
allocator can remove the redundant move in the common case when the
registers do not conflict.
Fixes #27046
- - - - -
7ab90288 by Rodrigo Mesquita at 2026-06-11T12:41:11-04:00
fix: make T27131 less flaky
It seems that T27131 fails flakily in a race where we check the flag
before the capability had the chance to process the mailbox which sets
the flag. This seemingly should only happen if the capability ends up
being the same for setting and checking the flag.
- - - - -
8965cb76 by Marc Scholten at 2026-06-12T04:53:22-04:00
haddock: render modules concurrently
- - - - -
8cc0b64a by Duncan Coutts at 2026-06-12T04:54:06-04:00
Promote HAVE_PREEMPTION from Timer.c to OSThreads.h
We will want to know about HAVE_PREEMPTION in more places.
HAVE_PREEMPTION tells us that we do have OS threads available,
irrespective of whether THREADED is defined. In particular,
HAVE_PREEMPTION is defined on all proper OSs, but not on WASM (and
hyopthetically may not be true on some other platforms like
micro-controllers, RTOSs, VM hypervisors etc).
- - - - -
cce574ed by Duncan Coutts at 2026-06-12T04:54:06-04:00
Define ACQUIRE_LOCK_ALWAYS and friends
Fix issue #27335
Like the atomic _ALWAYS variants, these lock actions are always defined,
rather than being dependent on whether we are in the THREADED case. All
the "normal" LOCK macros are defined to be no-ops when !THREADED.
The use case for the _ALWAYS variants is where we are using OS threads
even in the non-threaded RTS. This includes everything to do with the
timer/ticker thread, which is used in the non-threaded RTS too.
In particular, we will want to use this for eventlog things, because the
timer thread performs eventlogging concurrently with the main
capability, even in the non-threaded RTS.
- - - - -
1f28d1f6 by Duncan Coutts at 2026-06-12T04:54:06-04:00
Use ACQUIRE/RELEASE_LOCK_ALWAYS with eventBufMutex
Even in the non-threaded RTS the eventBufMutex is needed by both the
main capability and the timer/ticker thread, so always use the mutex.
This should fix #25165 which is about the main capability and the timer
thread posting events to the eventlog buffer concurrently and thereby
corrupting the buffer data.
- - - - -
0ff29782 by Duncan Coutts at 2026-06-12T04:54:06-04:00
Expose eventBufMutex in the EventLog interface/header
We will need it in forkProcess to ensure we don't write to the global
eventlog buffer concurrently with trying to flush eventlog buffers and
do the fork().
- - - - -
7a688395 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Split flushAllCapsEventsBufs into safe and unlocked version
Following the convention that unlocked versions have a trailing _
underscore in their name. This one requires the caller to hold the
eventlog global buffer mutex. We will need this in forkProcess.
- - - - -
341ed474 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Remove redundant use of stopTimer in setNumCapabilities
Historically, the comment here was:
We must stop the interval timer while we are changing the
capabilities array lest handle_tick may try to context switch
an old capability. See #17289.
and
We must disable the timer while we do this since the tick handler may
call contextSwitchAllCapabilities, which may see the capabilities array
as we free it.
What this refers to is that historically, when changing the number of
capabilities, the array of capabilities was reallocated to a new size,
allocating new ones and freeing the old ones, thus invalidating all
existing capbility pointers.
Strangely, for good measure the code used to call stopTimer twice (hence
the two similar comments above).
However, since commit a3eccf06292dd666b24606251a52da2b466a9612, the
capabilities array is no longer reallocated. Instead the array is
allcoated once on RTS startup to the maximum size it could ever be
allowed to be, and then capabilities get enabled/disabled at runtime. So
the capability pointers never become invalid anymore. At worst, they may
point to capabilities that are disabled.
Thus we no longer need to stop the timer (twice) while we change the
number of enabled capabilities. This also partially solves issue #27105,
which notes that stopTimer is being used as if it were synchronous, when
it is not. At least for this case, the solution is that stopTimer is not
needed at all!
- - - - -
674858e3 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Remove redundant use of stopTimer in forkProcess
but replace it with taking the eventlog buffer lock during the fork.
Fixes issue #27105
The original reason to block the timer during a fork was that
historically the timer was implemented using a periodic timer signal,
and the signal itself would interrupt the fork system call (returning
EINTR). For large processes (where fork() takes a while) this could
permanently livelock: the timer always would go off before the fork
could complete, which got retried in a loop forever.
The timer is no longer implemented as a unix signal, but uses threads.
Thus the original problem no longer exists. The only remaining reason to
block the timer tick is to prevent actions taken by the tick from
interfering with the delicate process involved in fork (taking a load of
locks and pausing everything).
The only thing we need to do is to prevent the eventlog from being
written to or flushed while the fork is taking place. To achieve this
all we need to do is hold the mutex for the global eventlog buffer.
This removes the last use of stopTimer that expects stopTimer to work
synchronously (which it was not) and thus solves issue #27105. To be
clear, we solve issue #27105 not by making stopTimer synchronous, but by
eliminating the use sites that expected it to be synchronous.
- - - - -
40764930 by sheaf at 2026-06-12T14:54:43-04:00
Add type family performance test for #26426
Some GHC versions produced large numbers of coercions after typechecking
and desugaring when compiling the program in #26426:
Version | Typechecker time | Typechecker allocations | Coercions
-------:|-----------------:|------------------------:|---------:
9.6 | 47 ms | 48 MB | 110k
9.8 | 1000 ms | 486 MB | 10,437k
9.10 | 922 ms | 489 MB | 10,436k
9.12 | 906 ms | 482 MB | 10,437k
9.14 | 63 ms | 55 MB | 333k
10.0 | 47 ms | 64 MB | 35k
The improvement 9.12 -> 9.14 was due to commit 22d11fa818fae2c95c494fc0fac1f8cb4c6e7cb6,
while the improvement 9.14 -> 10.0 was due to commit 0b7df6db9e46df40e86fbff1a66dc10440b99db5.
As the behaviour of GHC seems better than it's ever been on this program,
we declare victory, adding this performance test to ensure we don't
regress on this program.
On the way, we update Note [Combining equalities] in GHC.Tc.SolveR.Equality
with the explanation of the 9.12 -> 9.14 improvement (getting rid of an
exponential blowup in coercion sizes), and we update
Note [Exploiting closed type families] in GHC.Tc.Solver.FunDeps with
the explanation of the 9.14 -> 10.0 improvement (bringing down coercion
size growth from cubic to quadratic).
- - - - -
0f3d0a71 by Zubin Duggal at 2026-06-12T14:55:30-04:00
compiler: mark tool messages as errors/warnings depending on the exit code
Fixes #27370
- - - - -
d9ea2d76 by mangoiv at 2026-06-13T04:41:51-04:00
libraries/process: bump submodule to v1.6.30.0
- bump the submodule to the appropriate tag
- suppress benign warning resulting from the change
- - - - -
6ebaaba3 by David Eichmann at 2026-06-13T04:42:37-04:00
ghc-toolchain: don't throw when candidate executables are not found
Fixes #27369
- - - - -
6c65e1e1 by David Eichmann at 2026-06-13T04:43:23-04:00
CI: lint-changelog checks for no-changelog label in script instead of rules
- - - - -
bab37cc6 by konsumlamm at 2026-06-13T19:10:21+02:00
Implement CLC proposal #378
Add `Data.Double` and `Data.Float` modules
Document that GHC uses IEEE 754
- - - - -
fb5246ad by fendor at 2026-06-15T18:07:23-04:00
Drop `preloadClosure` from `UnitState`
It is always hard-coded to the same value.
Backpack Unit instantiation isn't using it any more.
Allows us to simplify the API and get rid of `improveUnit`.
- - - - -
291ce3aa by ARATA Mizuki at 2026-06-15T18:08:26-04:00
RISC-V NCG: Zero-extend the result of castFloatToWord32
According to the ISA manual, FMV.X.W sign-extends the result.
We need to truncate the result to avoid creating an exotic Word32 value.
Fixes #27300
- - - - -
011be91f by ARATA Mizuki at 2026-06-15T18:08:26-04:00
RISC-V NCG: Treat d28-d31 (ft8-ft11) as caller-saved
According to the calling convention, the registers d28-d31 (ft8-ft11) are caller-saved.
Fixes #27306
- - - - -
e8a54713 by ARATA Mizuki at 2026-06-15T18:08:26-04:00
RISC-V NCG: Set rounding mode when emitting `truncate`
If we omit the rounding mode for `fcvt`, `dyn` will be used.
We do not want that for `truncate`, so we set `rtz`.
In other places, we set `rne` because we do not use the dynamic rounding mode.
Fixes #27303
- - - - -
9438bec7 by Zubin Duggal at 2026-06-15T18:09:11-04:00
rts: fix validate build with gcc 16. `__attribute__((regparm(1)))` is ignored on x86_64 and now
gcc warns that it is ignored:
rts/sm/Evac.h:35:1: error:
error: ‘regparm’ attribute ignored [-Werror=attributes]
See https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ccead81bbc39668376eb5cf47066a…
Fixes #27366
- - - - -
893e6133 by Andrew Lelechenko at 2026-06-15T23:55:36+01:00
base: more NonEmpty zips
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/409
- - - - -
1314f2fd by David Eichmann at 2026-06-16T05:46:52-04:00
Hadrian: fix ghc-internal .def file name
- - - - -
7f72bcb3 by mangoiv at 2026-06-16T05:47:39-04:00
compiler: ignore camelCase and Eta reduce hlint hints
These do not cohere with the style used in GHC. After disabling them,
hlint lints are much less noisy again.
- - - - -
842bef9f by Alan Zimmerman at 2026-06-16T05:48:25-04:00
EPA: Use standard type family declaration for Anno
- - - - -
f6d30767 by Wolfgang Jeltsch at 2026-06-16T15:32:34-04:00
Fix two issues in the documentation of pipeline interruption
One issue is a typo (“interreuptible”), the other one the lack of an end
of a sentence, which has been reconstructed from the message of
633bbc1fd4762a2bb73ba1c5b9e0c279f1dd3c40, the commit that introduced
said documentation.
- - - - -
a3fa10e0 by Christian Georgii at 2026-06-16T15:33:26-04:00
Find plugins in sibling home units in multiple-home-unit sessions
In a multiple-home-unit session (e.g. `cabal repl --enable-multi-repl` or HLS), enabling a plugin with -fplugin that is defined in (or reexported by) another home unit failed with a "hidden package" error. The plugin module finder only searched the current home unit and the registered external packages, never the sibling home units.
findPluginModuleNoHsc now searches the home units that the current home unit depends on, following module reexports and respecting hidden modules, exactly as ordinary import resolution does in findImportedModuleNoHsc. To avoid two divergent copies of this logic, the shared home-unit search (the current home unit first, then its dependencies in priority order, with the accompanying ordering invariant) is extracted into findHomeModuleAmongDeps, which both findImportedModuleNoHsc and findPluginModuleNoHsc now call.
Add testsuite/tests/driver/multipleHomeUnits/plugin01, which loads a plugin as byte-code from a sibling home unit, and plugin02, in which the consumer enables a plugin reexported by a sibling home unit without depending on the plugin's own home unit directly.
Fixes #27349
- - - - -
d216412b by Ian-Woo Kim at 2026-06-16T20:25:57-04:00
Make the order of usages deterministic
It has been observed that the ordering of usages can be non-determinstic
in parallel builds. Therefore, this contribution introduces sorting of
usages based on a platform- and race-independent sorting criterion.
Resolves #26877.
Co-authored-by: Wolfgang Jeltsch <wolfgang(a)well-typed.com>
- - - - -
8e1cc105 by Wolfgang Jeltsch at 2026-06-16T20:25:57-04:00
Change the descriptions of two existing changelog entries
The descriptions now describe the changes in a user-friendly manner, as
opposed to describing the contributions that led to these changes in a
developer-friendly manner.
- - - - -
636c1c7a by Ian Duncan at 2026-06-16T20:26:50-04:00
AArch64: use SXTH, not SXTW, for W32 signExtendReg
signExtendReg was using SXTH (sign-extend halfword, 16-bit) for
W32-to-W64 sign extension. This should be SXTW (sign-extend word,
32-bit). SXTH only sign-extends the lower 16 bits, producing wrong
results for 32-bit values whose bit 15 differs from bit 31.
Other fixes:
- At sub-W64, code gen for MO_S_Mul2 should use W32 registers for
SMULL source operands as per the ARM spec (SMULL Xd, Wn, Wm),
and not W64.
- Ensure signExtendReg uses the source width for the source operand
in SXTW/SXTH/SXTB instructions. GNU as requires sxtw Xd,Wn (not
sxtw Xd,Xn), while LLVM's integrated assembler on macOS is lenient.
- Fix overflow flag computation for `MO_S_Mul2`. The overflow bit
was exactly inverted for sub-W64 operands.
Fixes #26978 and #27047
- - - - -
b734c75d by Igor Ranieri at 2026-06-16T20:27:32-04:00
haddock: Update CONTRIBUTING with missing step, add missing test
dependency
- - - - -
7fe4f2ec by Luite Stegeman at 2026-06-17T05:35:09-04:00
tag inference: don't confuse functions with their return values
inferTagRhs was mixing up taggedness for closures and return values
for function closures. We really shouldn't assign TagTuple to a
properly tagged function returning a tuple.
We fix this by keeping track of functions (TagFun) separately from
values (TagVal) and keeping track of their return value. TagFun is
also used for join points.
fixes #27005
- - - - -
4671c126 by Sebastian Graf at 2026-06-17T05:35:55-04:00
Seed the simplifier's in-scope set for open expressions
simplifyExpr simplifies expressions typed at the GHCi prompt and the
results of Template Haskell splices. Such an expression may be open: at a
GHCi debugger breakpoint its free variables include RuntimeUnk skolems
standing for as-yet-unknown types.
The simplifier began with an in-scope set holding only the wildcard
binder, so when it instantiated the unsafeCoerce# wrapper that GHCi
builds around a result, it formed a substitution whose range mentioned a
free skolem that was not in scope. That breaks the substitution invariant
and, in a compiler built with assertions, trips substTy's sanity check.
Seed the initial in-scope set with the free variables of the expression.
For a closed expression this adds nothing.
See Note [Seed the in-scope set for open expressions].
Fixes #17833 and its duplicate #21118.
- - - - -
67d41299 by Sebastian Graf at 2026-06-18T05:18:24-04:00
Desugar a `case` scrutinee only once (#27383, #20251)
In `dsExpr` for `HsCase` we desugared the scrutinee /twice/: once to
build the Core `case` itself, and again inside `matchWrapper`, which
re-desugared the source scrutinee (via `addHsScrutTmCs`) purely to
record long-distance information for the pattern-match checker.
For a single `case` that is merely wasteful. But for nested cases it
is catastrophic. Consider
case (case (case e of ... ) of ... ) of ...
Desugaring the outer scrutinee desugars the middle `case` twice, each
of which desugars the inner `case` twice, and so on. The work doubles
at every level, so desugaring takes O(2^n) time in the nesting depth.
That is the blowup reported in #27383; it is also what makes the
machine-generated program in #20251 take an age to compile.
The fix is simple. `matchWrapper` is handed the scrutinee anyway, so
we give it the Core expression we have /already/ desugared, and record
the long-distance term constraint with `addCoreScrutTmCs` instead of
re-desugaring from source. This is just what `matchSinglePatVar`
already does for single-pattern matches.
So:
* `matchWrapper` now takes `Maybe [CoreExpr]` rather than
`Maybe [LHsExpr GhcTc]`.
* The `HsCase` equation of `dsExpr` passes the already-desugared
`core_discrim`; the arrow desugarer passes its match variables.
* `addHsScrutTmCs` had no other use, so it is gone.
Desugaring is now linear in the nesting depth. (The coverage checker
still runs `simpleOptExpr` over each scrutinee, which leaves the total
at O(n^2); that is ample.) The long-distance information itself is
unchanged: the checker sees precisely the Core that backs the
generated code.
Test: deSugar/should_compile/T27383
- - - - -
fa5defde by Rodrigo Mesquita at 2026-06-18T05:19:11-04:00
fix: Save FastStrings in the PMC
There is no point in adding the unique to the occurrence FastString we
create, since it is part of the Id anyway.
Adding it to the FastString, meant each FastString was unique
unnecessarily!
In a separate branch, running the compiler on test `InstanceMatching`
observed 30000 `FastString`s created by this code path.
Plus, `fsLit "pm"` follows the existing pattern in `mkPmId`.
- - - - -
4efb4a66 by Alan Zimmerman at 2026-06-18T14:41:14-04:00
TTG: Add extension points to HsConDetails
Extend HsConDetails as
data HsConDetails p arg rec
= PrefixCon !(XPrefixCon p) [arg] -- C @t1 @t2 p1 p2 p3
| RecCon !(XRecCon p) rec -- C { x = p1, y = p2 }
| InfixCon !(XInfixCon p) arg arg -- p1 `C` p2
| XHsConDetails !(XXHsConDetails p)
type family XPrefixCon p
type family XRecCon p
type family XInfixCon p
type family XXHsConDetails p
- - - - -
c8d27dd4 by Simon Jakobi at 2026-06-18T14:41:59-04:00
CI: quiet submodule clean output in after_script and setup
The clean and cleanup_submodules functions ran 'git submodule foreach
git clean -xdf', flooding the job log with 'Entering ...' and
'Removing ...' lines. Pass --quiet to 'git submodule' and -q to 'git
clean' to drop the success output; errors are still reported.
Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com>
- - - - -
09326ca6 by Matthew Pickering at 2026-06-20T23:41:12+02:00
Add missing req_interp modifier to T18441fail3 and T18441fail19
These tests require the interpreter but they were failing in a different
way with the javascript backend because the interpreter was disabled and
stderr is ignored by the test.
- - - - -
521e55bf by Matthew Pickering at 2026-06-20T23:41:13+02:00
hadrian: Fill in more of the default.host toolchain file
When you are building a cross compiler this file will be used to build
stage1 and it's libraries, so we need enough information here to work
accurately. There is still more work to be done (see for example, word
size is still fixed).
- - - - -
23c9b6c3 by Matthew Pickering at 2026-06-20T23:42:52+02:00
hadrian: Build stage 2 cross compilers
* Most of hadrian is abstracted over the stage in order to remove the
assumption that the target of all stages is the same platform. This
allows the RTS to be built for two different targets for example.
* Abstracts the bindist creation logic to allow building either normal
or cross bindists. Normal bindists use stage 1 libraries and a stage 2
compiler. Cross bindists use stage 2 libararies and a stage 2
compiler.
* hadrian: Make binary-dist-dir the default build target. This allows us
to have the logic in one place about which libraries/stages to build
with cross compilers. Fixes #24192
New hadrian target:
* `binary-dist-dir-cross`: Build a cross compiler bindist (compiler =
stage 1, libraries = stage 2)
This commit also contains various changes to make stage2 compilers
feasible.
-------------------------
Metric Decrease:
LinkableUsage02
ManyAlternatives
ManyConstructors
MultiComponentModulesRecomp
MultiLayerModulesRecomp
RecordUpdPerf
T10421
T12150
T12227
T12425
T12707
T13035
T13379
T13820
T15703
T16577
T18140
T18282
T18698a
T18698b
T18923
T1969
T20049
T21839c
T3294
T4801
T5030
T5321FD
T5321Fun
T5631
T5642
T6048
T783
T9020
T9198
T9233
T9630
T9872d
T9961
parsing001
T3064
Metric Increase:
T26989
hard_hole_fits
-------------------------
Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com>
- - - - -
26fed8ab by Matthew Pickering at 2026-06-20T23:42:52+02:00
ci: Test cross bindists
We remove the special logic for testing in-tree cross
compilers and instead test cross compiler bindists, like we do for all
other platforms.
- - - - -
80c8910e by Matthew Pickering at 2026-06-20T23:42:52+02:00
ci: Introduce CROSS_STAGE variable
In preparation for building and testing stage3 bindists we introduce the
CROSS_STAGE variable which is used by a CI job to determine what kind of
bindist the CI job should produce.
At the moment we are only using CROSS_STAGE=2 but in the future we will
have some jobs which set CROSS_STAGE=3 to produce native bindists for a
target, but produced by a cross compiler, which can be tested on by
another CI job on the native platform.
CROSS_STAGE=2: Build a normal cross compiler bindist
CROSS_STAGE=3: Build a stage 3 bindist, one which is a native compiler and library for the target
- - - - -
8215573d by Sven Tennie at 2026-06-20T23:42:52+02:00
ci: Increase timeout for emulators
Test runs with emulators naturally take longer than on native machines.
Generate jobs.yml
- - - - -
5acb7dbc by Matthew Pickering at 2026-06-20T23:42:52+02:00
ci: Javascript don't set CROSS_EMULATOR
There is no CROSS_EMULATOR needed to run javascript binaries, so we
don't set the CROSS_EMULATOR to some dummy value.
- - - - -
48345343 by Sven Tennie at 2026-06-20T23:42:52+02:00
Javascript skip T23697
See #22355 about how HSC2HS and the Javascript target don't play well
together.
- - - - -
5e44fd05 by Sven Tennie at 2026-06-20T23:42:52+02:00
Mark T24602 as fragile
It was skipped before (due to CROSS_EMULATOR being set, which changed
for JS), so we don't make things worse by marking it as fragile.
- - - - -
ab349ec2 by Sven Tennie at 2026-06-20T23:42:52+02:00
Fix T22744 for GHCJS
In fact, this test needs Template Haskell, not necessarily an
interpreter.
- - - - -
c73352d8 by Sven Tennie at 2026-06-20T23:42:52+02:00
haddock-test: fix GHCJS haddock test failures
Add --ghc-pkg-path flag support so haddock test runner can find
cross-prefixed ghc-pkg (e.g. javascript-unknown-ghcjs-ghc-pkg) which
is not on $PATH in cross install directories.
Skip haddockHtmlTest on GHCJS: Threaded.hs uses forkOS in a TH splice,
which GHCJS RTS doesn't support. Mark with js_skip in all.T.
- - - - -
5e814e76 by Andreas Klebinger at 2026-06-22T23:00:24-04:00
compiler: Deduplicate hscTidy
This function was accidentally duplicated during a refactor.
Fixes #27351
- - - - -
473b97eb by sheaf at 2026-06-22T23:01:22-04:00
Avoid mkTick in Core Prep breaking ANF (part II)
Hotfix for 2f9579765f55b3920ceb2e04995ff41a9d0e2d4e fixing a small
oversight in the call to tickTickedExpr from mkTick, in which we
improperly recursively called mkTick without passing on the preserve_anf
flag.
Fixes #27386
- - - - -
9284a1f7 by Simon Hengel at 2026-06-23T05:55:33-04:00
Don't use global variables to address concurrency bugs! (fixes #27234)
This was originally introduce with
88f38b03025386f0f1e8f5861eed67d80495168a to address #17922.
In this specific case a better fix would have been to synchronize on
stderr:
withHandle_ "stderrSupportsAnsiColors" stderr $ \ _ -> do
...
But apparently the dependency on `terminfo` was removed in
32ab07bf3d6ce45e8ea5b55e8095174a6b42a7f0, preventing #17922 in the first
place.
- - - - -
44309cd3 by Alan Zimmerman at 2026-06-23T05:56:20-04:00
EPA: remove LocatedL / SrcSpanAnnL and LocatedLI / SrcSpanAnnLI
This is part of a refactor towards only having LocatedA / SrcSpanAnnA
It removes the stated items, but has to add back one for BooleanFormula,
LocatedBF / SrcSpanAnnBF
This commit also use the HsConDetails RecCon extension point to
capture the braces in a record constructor
- - - - -
2f6a5534 by Simon Jakobi at 2026-06-23T15:46:20+02:00
Add -dstable-core-dump-order for stable Core dump ordering (#27296)
The order of top-level bindings in Core dumps (-ddump-simpl etc.) is the
compiler's Unique-sensitive internal processing order, so an unrelated
upstream change can reorder them and defeat a textual diff of two dumps.
This adds an opt-in flag -dstable-core-dump-order that reorders the
top-level bindings of dumps routed through dumpPassResult into a stable,
Unique-independent order, so two dumps line up across rebuilds. See
Note [Stable Core dump order] in GHC.Core.Ppr for the sort key and its
rationale.
Adds tests T27296 (binders GHC emits in non-source order by default,
asserted to come out stably ordered under the flag) and T27296b (an
untidied -ddump-float-out dump pinning the ordering of the anonymous lvl
floats by literal value).
Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com>
- - - - -
141986e3 by mangoiv at 2026-06-24T15:51:14-04:00
compiler: refactor error reporting code for ExplicitLevelImports
Refactors error reporting code for ExplicitLevelImports to pass in a
RdrName and a GlobalReaderElt to be able to report errors that are
faithful to the source and to more precisely distinguish between names
that are in scope from different qualifications.
Fixes #27385 and #26616
- - - - -
aa7df6b6 by Simon Hengel at 2026-06-24T15:52:18-04:00
Set GHC_VERSION when calling custom pre-processors (see #25952)
(so that pre-processors can emit backwards compatible code)
- - - - -
a9e494f2 by Simon Hengel at 2026-06-24T15:54:08-04:00
Add a flag to control GHCi specific error hints (close #27409)
- - - - -
a805b2a2 by Simon Hengel at 2026-06-24T15:55:20-04:00
Reference correct package in error messages for reexported modules
(fixes #27417)
- - - - -
f235d183 by Simon Jakobi at 2026-06-25T05:51:18-04:00
Add explicit setBit/clearBit/complementBit for instance Bits Integer (#21176)
The default setBit, clearBit, and complementBit methods allocate
intermediate Integers per call. Define them explicitly via the new
integerSetBit[#], integerClearBit[#] and integerComplementBit[#], built
on the BigNat# primitives, which avoid those allocations. Allocation is not
eliminated entirely -- the negative (IN) cases would need in-place mutation,
which is left as future work.
The default methods constant-folded on literal arguments via the
integerOr/integerAnd/integerXor rules, which fold literal Integers of any
size. The explicit functions have no such rule, so they (their Word-argument
wrappers, and the Bits Integer methods) are marked INLINE to expose the
underlying primops to the simplifier; see Note [INLINE for constant folding
of bit operations]. This restores folding only on the small-int (IS) path --
large literal Integers (IP/IN) are no longer constant-folded, a minor
regression for that case. T8832 covers the IS-path folding.
The new golden-output test T21176 checks all three operations against the
default implementations across the sign/size boundaries, recording each
result plus its integerCheck validity. The base and ghc-bignum interface-
stability export goldens gain the new functions.
The main changelog entry lives in changelog.d under a new ghc-internal
section (renamed from ghc-prim).
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/423
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
202ed264 by Marc Scholten at 2026-06-25T05:52:21-04:00
haddock: use Text in documentation pipeline
This patch moves Haddock's documentation pipeline from String to Text
where the data is already textual. It avoids repeated conversions while
keeping the existing decoding behavior for invalid UTF-8 docstring
chunks.
The main changes are:
* Render and carry docstrings as Text in Haddock-facing paths.
* Use the Binary Text instance from GHC.Utils.Binary for Haddock
interface files, and bump the Haddock binary interface version.
* Add a FastString HTML instance so XHTML rendering avoids
intermediate String allocation.
* Keep HsDocStringChunk decoding lenient, matching the previous
unpackHDSC behavior on invalid UTF-8 input.
* Update the xhtml submodule to 3000.4.1.0, which contains the
apostrophe escaping fix used by the Haddock test output.
Co-authored-by: copilot-swe-agent[bot] <198982749%2BCopilot(a)users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply(a)anthropic.com>
Assisted-by: Codex <codex(a)openai.com>
- - - - -
a72ff58f by mangoiv at 2026-06-25T05:53:07-04:00
compiler: rename ZonkAny to UnusedType and add pretty printing logic
ZonkAny is a hard to understand name for users who do not know how the
compiler works internally. Additionally, it is confusing that ZonkAny,
while being a concrete type *represents* a meta variable, espeically in
the compiler output.
This patch changes the name of ZonkAny to UnusedType which is closer to
its intended semantics and adds special pretty printing logic to display
this type in the same fashion the compiler displays meta variables in
other places, whenever they leak from the implementation to the user.
It also exports the type from ghc-internal:GHC.Internal.Types in order
to expose documentation.
Fixes #27390
Co-Authored-By: Sam Derbyshire <sam.derbyshire(a)gmail.com>
- - - - -
6813f002 by Simon Jakobi at 2026-06-26T04:51:47-04:00
Reg.Linear: drop Platform argument from most FR (FreeRegs) methods
The FR class has one instance per CPU architecture, so any
architecture-constant information its methods derived from the Platform
argument can instead be baked into the instance. This removes the now
needless Platform argument from frAllocateReg, frGetFreeRegs and
frReleaseReg.
frInitFreeRegs keeps its Platform argument: the initial allocatable set is
genuinely platform-dependent, see Note [Aarch64 Register x18 at Darwin and
Windows].
Fixes #26665
Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com>
- - - - -
3b2a9409 by Zubin Duggal at 2026-06-26T04:52:39-04:00
testsuite: Report fragile failures as skipped in JUnit output
- - - - -
27463426 by Rodrigo Mesquita at 2026-06-26T20:54:58-04:00
perf: Share Module in Iface Symbol Table
This commit modifies the structure of the serialized `SymbolTable Name`
to then re-use and share the `Module` (both on disk and in memory) across
all `Name`s from the same module.
The new structure looks like:
<total name count>
$modules.size
for (mod, names) in $modules:
$mod
$names.size
for table_ix, occ in $names
$table_ix
$occ
i.e. we put the module just once, followed by all names in that module.
When deserializing, we deserialize the module just once, and all the
following `Name`s are constructed with a pointer to that same decoded
`Module`.
In `hoogle-test`, we must use `DNameEnv` rather than `Map Name`,
otherwise the output fixities order was susceptible to changes in the
uniques assigned to each Names, which is not stable.
Fixes #27401
-------------------------
Metric Decrease:
InstanceMatching
LinkableUsage01
LinkableUsage02
hard_hole_fits
-------------------------
- - - - -
412f1675 by Simon Hengel at 2026-06-26T20:55:41-04:00
Rename `MCDiagnostic` to `InternalMCDiagnostic`
`MCDiagnostic` is meant to be used for compiler diagnostics.
Any code that creates `MCDiagnostic` directly, without going through
`GHC.Driver.Errors.printMessage`, sidesteps `-fdiagnostics-as-json` (see
e.g. !14616, !14475, !14492 !14548).
To avoid this in the future, this change more narrowly controls who
creates `MCDiagnostic` (see #24113).
- - - - -
6f212121 by Facundo Domínguez at 2026-06-26T20:56:27-04:00
Encapsulate options of occurAnalysePgm in a record
- - - - -
adfbb179 by Facundo Domínguez at 2026-06-26T20:56:27-04:00
Allow to configure the occurrence analyser to retain some dead bindings
This is needed by plugins that are the only consumers of a binding which
is otherwise unused in the program.
See Note [Controlling elimination of dead bindings in occurrence analysis]
added in this commit, or
https://gitlab.haskell.org/ghc/ghc/-/issues/27240 for more discussion.
- - - - -
c745b11f by Copilot at 2026-06-26T20:56:27-04:00
Address documentation feedback
- - - - -
2c2a4a2a by Copilot at 2026-06-26T20:56:27-04:00
Keep the imp_rules parameter of occurPgmAnalysePgm and add occ_opts to OccEnv
- - - - -
e2262b0e by Copilot at 2026-06-26T20:56:27-04:00
Strengthen T27240.hs with a binding that should be removed
- - - - -
5f9d9268 by Copilot at 2026-06-26T20:56:27-04:00
Move the reference #27240 to a related paragraph
- - - - -
d86d2644 by Simon Hengel at 2026-06-26T20:57:10-04:00
Remove deprecated flag `-ddump-json` (see #24113)
This was first deprecated in 9.10.1.
- - - - -
3b15ff03 by Simon Jakobi at 2026-06-27T18:48:34+02:00
Tweak mk_mod_usage_info
* Use O(log n) `elemModuleEnv` instead of O(n) `elem` to filter the
direct imports.
* Use `nonDetModuleEnvKeys` to avoid sorting the ent_map keys twice.
* Prepend the presumably shorter list when creating all_mods with
`(++)`. Actually this eliminates the `(++)` entirely, as it seems to
fuse with the `filter` expression.
As a result there is a tiny speed-up when generating the .hi-files for
modules with many imports.
None of the changes affect compilation determinism as the module list
is explicitly sorted to ensure a canonical order.
- - - - -
2d0fd154 by Alan Zimmerman at 2026-06-29T11:44:00-04:00
EPA: Remove LocatedC / SrcSpanAnnC
This is part of a cleanup of the zoo of
SrcSpanAnnXXX types for exact print annotations.
This one removes SrcSpanAnnC used for storing exact print annotations
for contexts. It replaces it with an explicit `HsContext` data type
that carries the annotations and the context.
So, replace
type HsContext pass = [LHsType pass]
with
type HsContext pass = HsContextDetails pass (LHsType pass)
data HsContextDetails pass arg
= HsContext
{ hsc_ext :: !(XHsContext pass)
, hsc_ctxt :: [arg]
}
| XHsContextDetails !(XXHsContextDetails pass)
We need the parameterised HsContextDetails because it is used both for
HsQual carrying 'LHsExpr p' and "normal" contexts carrying 'LHsType p'.
- - - - -
cca0d589 by Luite Stegeman at 2026-06-30T13:33:40-04:00
rts: handle large AP closures in compacting GC
The function update_fwd_large in the compacting GC could run into
an unexpected object with the following error:
internal error: update_fwd_large: unknown/strange object 24
Closure type 24 is the AP closure, which was not handled in
upd_fwd_large. This patch adds handling them.
fixes #27434
- - - - -
42935858 by Luite Stegeman at 2026-06-30T13:33:40-04:00
testsuite: use compacting_gc way instead of hardcoding +RTS -c
- - - - -
bf7b5ce6 by Alan Zimmerman at 2026-06-30T13:34:23-04:00
EPA: Remove LocatedLW from LStmtLR
HsDo already had its XDo extension point for an
AnnList, which also appeared in LocatedLW.
So we remove the redundant one and use the one inside HsDo
as originally intended.
Also delete LocatedLC/LocatedLS as they were unused
- - - - -
d7cfea49 by Recursion Ninja at 2026-06-30T21:37:12-04:00
Decoupling 'L.H.S' from 'GHC.Types.SourceText'
* Migrated 'IntegralLit' to 'L.H.S.Lit'.
* Migrated 'FractionalLit' to 'L.H.S.Lit'.
* Migrated 'StringLiteral' to 'L.H.S.Lit'.
* Added TTG extension points to the types above.
* Added nice export list to 'GHC.Hs.Lit'.
* Added 'rnOverLitVal' and 'tcOverLitVal' functions to 'GHC.Hs.Lit'.
* Added instance 'Anno (StringLiteral (GhcPass p)) = SrcSpanAnnN'
* Moved [Notes] about 'SourceText' from 'L.H.S.*' to 'GHC.*'.
* Removed all references to 'SourceText' from 'L.H.S'.
* Removed the trailing comma record field from 'StringLiteral'
* Renamed exported functions for nomenclature consistency.
* Deprecated the renamed functions
Fixes #26953
- - - - -
a1f2558b by Recursion Ninja at 2026-06-30T21:37:12-04:00
Monomorphising GHC pass parameters where appropriate
- - - - -
7bf9e3c5 by Teo Camarasu at 2026-06-30T21:38:03-04:00
Make Q abstract
This patch aims to clearly demarcate the internal and external interfaces
of Q.
In the past the `Quasi` typeclass was both part of the external,
public-facing interface, and was used to give the implementation of `Q`.
Now we separate out these two distinct roles. `Quasi` continues to exist
in the public interface, but we introduce a new `MetaHandlers` type,
which is equivalent to `Dict Quasi`.
`Q a` is now defined to be `MetaHandlers -> IO a`, and, crucially,
the constructor and the new `MetaHandlers` type are not exposed from the
public interface.
This gives us the ability to vary the interface on the GHC side without
forcing a breaking change on the `template-haskell` side.
Similarly `template-haskell` has more freedom to change the `Quasi`
typeclass without needing any changes in `lib:ghc`.
Implements https://github.com/ghc-proposals/ghc-proposals/pull/700
Resolves #27341
- - - - -
4262af36 by L0neGamer at 2026-06-30T21:38:56-04:00
generically defines mconcat in terms of internal type's Semigroup instance
add changelog entry
use simpler definition for mconcat
`nonEmpty` isn't available yet; inline branches in case
add test case
fixup generically defines mconcat in terms of internal type's Semigroup instance
add comment on Generically and deriving mishaps
swap mconcat to foldr version
add some strictness testing for mconcat
add to `base` changelog entry
- - - - -
e22ad997 by Cheng Shao at 2026-06-30T21:39:43-04:00
hadrian/rts: fix unregisterised build for gcc 15+
This patch fixes unregisterised build for gcc 15+:
- Pass -optc-Wno-error in hadrian when +werror enables -optc-Werror,
see added comment for details.
- For RTS functions that the codegen would emit calls, ensure their
real prototype is hidden when the header is included in .hc fies
(IN_STG_CODE), and the dummy prototype is provided to match the EFF_
convention.
In the future we should get rid of EFF_ (#14647) and remove these
hacks, but for now this patch makes unregisterised work again on newer
toolchains. Fixes #27404.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
3f00f234 by Cheng Shao at 2026-06-30T21:40:32-04:00
compiler: fix missing handling of CmmUnsafeForeignCall node in LayoutStack
This patch fixes missing handling of `CmmUnsafeForeignCall` middle
node in the `LayoutStack` pass.
Before proc-points splitting, this pass computes liveliness of local
registers, and spills those alive across a Cmm native call onto the
stack. It need to traverse all middle nodes in each block and check
whether a local register is an assignee, if so then the previous
mapping in `sm_regs` is invalidated and needs to be dropped. However,
it didn't handle `CmmUnsafeForeignCall` node which may also assign to
a local register. When proc-points splitting is enabled, this can
produce an invalid basic block that doesn't properly backup the
updated local register to the stack before doing a Cmm call, resulting
in completely invalid runtime behavior.
The patch also adds a `T27447` regression test. With no-TNTC or with
LLVM backend, without the fix the test case would output a stale
0x1111111111111111 value, instead of the expected 0x2222222222222222
output.
Fixes #27447.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
701088db by Ben Gamari at 2026-07-01T10:34:03-04:00
gitlab-ci: Drop vestigial references to make build system
- - - - -
62d54a53 by Ben Gamari at 2026-07-01T10:34:03-04:00
gitlab-ci: Add support for running specifying a job's testsuite ways
- - - - -
7f97ac2c by Ben Gamari at 2026-07-01T10:34:03-04:00
gitlab-ci: Run llvm testsuite ways in llvm jobs
Addresses #25762.
- - - - -
7ea75116 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Add normalise_ddump_deriv setup function
Some tests check the result of -ddump-deriv, which may contain INLINE pragmas depending on optimization flags.
With normalise_ddump_deriv setup function, INLINE pragmas are stripped off.
- - - - -
c7a8199f by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Use -dsuppress-idinfo to make tests more robust
Previously, T18052a and T21755 were failing on 'optasm' and 'optllvm' ways because of visibility of unfoldings.
- - - - -
a12122e5 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Use a trick to keep large objects alive
Previously, T17574 and T19381 were failing on 'optasm' and 'optllvm' ways because of compiler optimizations.
Change them to use NOINLINE to prevent unwanted optimizations.
- - - - -
1a95b327 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Only run T24224 in 'normal' way
This test is a frontend-only one and breaks if optimizations are enabled.
- - - - -
8abea737 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Ignore T18118's stderr
When optimizations are enabled, the compiler emits a warning (You cannot SPECIALISE ...).
The message is not important, so ignore it.
- - - - -
9453a722 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Mark T816 and tc216 broken with optimizations
These tests are about type checking, so we should not care too much if they are broken with optimizations.
See #26952
- - - - -
0aef9ec0 by Ben Gamari at 2026-07-01T10:34:03-04:00
testsuite: ds014 is not longer broken
It now appears to pass in the ways it was marked as broken in.
Closes #14901.
- - - - -
4692d1e4 by Ben Gamari at 2026-07-01T10:34:03-04:00
testsuite: Only run stack cloning tests in the normal way
These are too dependent upon code generation specifics to pass in most
other ways.
- - - - -
c154df26 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Update options_ghc_fbyte-code
The `-fbyte-code` option used to be overriden by `-fllvm` but it is no longer true since !14872 was merged.
I updated the test to accept the new behavior.
Closes #27049
- - - - -
5d8bb7b5 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Only run T22744 in 'normal' way
This test takes a long time on optimized ways.
- - - - -
d1e74c8e by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Disable tests that use -finfo-table-map on llvm ways
Currently, -finfo-table-map does not work with -fllvm. See #26435
- - - - -
3bf38c84 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Don't run T24726 on optimized ways
If optimizations are enabled, the rewrite rule just fires and -drule-check will report nothing.
- - - - -
e4eef116 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Use -fno-unoptimized-core-for-interpreter when running LinkableUsage01/02
Optimizations for the bytecode interpreter are considered experimental, and need a flag to be enabled.
- - - - -
234a9872 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Suppress unwanted optimizations on T25284
- - - - -
99a2af2f by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Don't run stack_big_ret with optimizations
Stack layout may change with optimizations enabled.
- - - - -
04c836df by ARATA Mizuki at 2026-07-01T10:34:04-04:00
testsuite: Mark memo001 broken on optimized ways
See #27396
- - - - -
1a8a24f4 by ARATA Mizuki at 2026-07-01T10:34:04-04:00
testsuite: Mark syn-perf broken on optimized ways
See #27398
- - - - -
40412093 by Duncan Coutts at 2026-07-01T10:34:50-04:00
Add a test for thread scheduler fairness
It also tests that the interval timer and context switching works.
We also test that fairness is lost when the context switching interval
is too coarse for the duration of the test.
We add this test before doing surgery on the interval timer, so we have
decent coverage.
- - - - -
3f34d557 by Duncan Coutts at 2026-07-01T10:34:50-04:00
Make exported stop/startTimer no-ops, and rename internal functions
Specifically, internally rename:
stop/startTimer to pause/unpauseTimer
stop/startTicker to pause/unpauseTicker
and keep stop/startTimer as exported functions, but now as no-ops.
In the past the stop/startTicker actions were used incorrectly as if
they were synchronous, which they are not. See issue #27105. We now
document pause/unpackTicker as being async and not to be used for the
purpose of concurrency safety.
The existing stop/startTimer (note Timer not Ticker, the Timer calls the
Ticker!) are also exported from the RTS as a public API. This was
historically because the ticker used signals and it was important to
suspend the timer signel over a process fork. So these functions were
exported to be used by the process and unix libraries.
We cannot just remove the RTS exports, but we now make them no-ops, and
they can be removed from the process and unix library later. This
was already documented in a changelog.d entry no-more-timer-signal but
due to changes during the MR process the change to make stop/startTicker
into no-ops didn't make it into the earlier MR.
- - - - -
02e84e5f by Duncan Coutts at 2026-07-01T10:34:51-04:00
Make exitTicker/exitTimer unconditionally synchronous
We never use them asynchronously, and we should never need to do so.
And update some related comments.
- - - - -
13db6a72 by Duncan Coutts at 2026-07-01T10:34:51-04:00
posix ticker: update and improve comments on (un)pause and exit
Clarify what is async vs sync.
- - - - -
43d9a07d by Duncan Coutts at 2026-07-01T10:34:51-04:00
posix ticker: split out ppoll/select helper functions
Move the #ifdefs out of the main code body by introducing local helper
functions and types, which themselves have two implementations (with a
common API) based on ppoll or select.
This helps improve clarity/readability.
- - - - -
a5491baa by Duncan Coutts at 2026-07-01T10:34:51-04:00
posix ticker: improve the implementation
The existing implementation supported pausing and exiting, with the
implementation of pausing reling on a mutex and condition variable.
It needed to check the pause and stop shared variables on every
iteration. It relies on ppoll or select, to wait on the timeout and also
wait on an interrupt fd. The interrupt fd was only used for prompt
exit/shutdown, and not for pausing or other notification. The pause only
needed a lock and a memory operation, but the pause was not prompt. The
resume used a lock, and signaling a cond var.
The new implementation uses a somewhat more regular design: every
notification is done by setting a shared variable and
interrupting/notifying the ticker via the fd. The ticker thread does not
need to check any shared variables on normal timer expiry, only when it
recevies notification. This may be a micro-optimisation, but the tick
occurs 100 times a second by default so any improvements in the hot path
are amplified. When the ticker thread does receive notification it can
check the various shared variables and update its local state. The
blocking relies on using ppoll/select but without a timeout. This avoids
the condition var and also allows further notifications when paused
(also used for unpausing).
This design can be extended with further notification types if needed by
using and checking further shared vars (or making existing shared vars
an enum or counter). This may be used in future for additional
notifications to the ticker thread. This will likely be used to proxy
wakeUpRts from a single handler context for example. And this approach,
avoiding mutexes, is compatible with use from signal handlers.
So overall, it's:
* slightly simpler / more regular;
* easier to extend with additional notifications;
* probably slightly more efficient (but a micro-optimisation);
* and supports calling notification from signal handlers
- - - - -
5b20821e by Duncan Coutts at 2026-07-01T10:34:51-04:00
posix ticker: further minor local renaming for code clarity
Improve the clarity with better choice of names for several local vars
and function.
- - - - -
1f3ec5e0 by Duncan Coutts at 2026-07-01T10:34:51-04:00
win32 ticker: split out local helper functions
- - - - -
596e7307 by Duncan Coutts at 2026-07-01T10:34:51-04:00
win32 ticker: provide guarantee about concurrency and idempotency
Use a lock to ensure pause/unpause can be used concurrently. Use a
paused variable, protected by the lock, to ensure that pause and unpause
are both idempotent. This is what the portable API expects.
- - - - -
1870edd7 by Duncan Coutts at 2026-07-01T10:34:51-04:00
win32 ticker: make the initial tick be after one wait interval
There is no need to tick immediately. This is consistent with the
posix implementation.
- - - - -
7c15ab5b by Duncan Coutts at 2026-07-01T10:34:51-04:00
ticker: remove now-unnecessary layer of enable/disable
There was an atomic variable used to block *part* of the actions of the
tick handler. This still did not make stopTimer synchronous, even for
the part of the the handle_tick actions it covered. It also added a more
expensive (sequentuially consistent) atomic operation in the hot path
for the handle_tick action, whereas our new design requires no atomic
ops at all.
Now that we have eliminate the need for synchronous stop/startTicker,
we don't need this not-quite-working-anyway atomic protocol. The new
pause/unpauseTicker is explicitly asynchronous and idempotent.
- - - - -
8585f8cb by Duncan Coutts at 2026-07-01T10:34:51-04:00
ticker: add TODOs about issue #27250: too much being done from handle_tick
The handle_tick should not perform I/O, block, perform long-running
operations or call arbitrary user code. Unfortunately, everything to
do with the eventlog (at the moment) falls into all those categories.
- - - - -
6e381626 by Duncan Coutts at 2026-07-01T22:29:55+01:00
Adjust releaseCapability_ precondition to allow cap->running_task == NULL
There are two use cases for releaseCapability_:
1. The current Task (cap->running_task) releases the Capability.
The Capability is marked free, and if there is any work to do,
an appropriate Task is woken up.
2. There is no current task (cap->task == NULL), and thus the
Capability is idle, and we want to wake up an idle Task to animate
the Capability. This case uses always_wakeup.
Currently, the precondition for releaseCapability_ is
cap->running_task != NULL
and so the 2nd use cases have to set cap->running_task (which is then
immediately overwritten) just to satisfy the precondition. See the
use cases in sendMessage and prodCapability.
So we can relax the precondition to be:
cap->running_task != NULL || always_wakeup
so that in the always_wakeup case, we say it is ok for the
cap->running_task to be NULL.
This lets us simplify sendMessage and prodCapability. In particular it
will allow prodCapability to not need a Task parameter.
The ulterior motive for all this is that I want to be able to call
prodCapability from an OS thread that is not itself a Task, in persuit
of issue #27086: disentangle I/O managers from wakeUpRts. The most
straightforward way to wake the RTS is using prodCapability, but the
context in which we will need to do that are threads that are not Tasks.
- - - - -
89404ebc by Duncan Coutts at 2026-07-01T22:29:55+01:00
prodCapability no longer needs to take a Task param
Now that releaseCapability_ can accept cap->running_task == NULL then it
is no longer necessary for prodCapability to require a Task.
- - - - -
4e60c5f6 by Duncan Coutts at 2026-07-01T22:29:56+01:00
Define prodOneCapability
There was an existing declaration for this in the header file, but no
definition.
Similarly, there is a declaration for prodAllCapabilities but no
definition, and we don't need it, so remove the declaration.
- - - - -
2527026f by Duncan Coutts at 2026-07-01T22:29:56+01:00
Add a wakeUpRtsViaTicker feature to the posix ticker
It proxies a call to wakeUpRts, but crucially, this can be called from
a signal handler context. It will be used for ctl-c handling.
- - - - -
aa5a03a5 by Duncan Coutts at 2026-07-01T22:29:56+01:00
Change how wakeUpRts works
Previously it would call wakeupIOManager to get a capability to wake up
and run. This works but it entangles the I/O managers with unrelated
features: ctl-c handling and idle gc (the two features that use wakeUpRts).
The reason it used wakeupIOManager is that this action is safe to use
from a posix signal handler, since it just posts bytes to a pipe.
Otherwise the more direct approach (used e.g. by sendMessage when the
target capability is idle) is to use releaseCapability. But that uses
condition variables and mutexes, which are not safe to use from within a
signal handler.
So instead of entangling the (multiple) I/O managers with this, we make
wakeUpRts use the direct approach (using prodOneCapability). On win32
the ctl-c console handler can call wakeUpRts directly, since it is
called in a proper thread. On posix, to deal with the signal handler
problem, we make the signal handler ask the ticker thread to proxy the
call to wakeUpRts, since the ticker thread is also a proper thread.
This will allow the I/O managers to no longer be concerned with this.
This is good because there are many I/O managers (and they're
complicated), but there is (on posix) only one ticker implementation. So
this is an overall reduction in coupling and complexity.
Fixes issue #27086
- - - - -
c6d53c16 by sheaf at 2026-07-02T21:35:44-04:00
Test driver: normalise line numbers into libraries
When comparing the stdout of tests that print out callstacks, we can't
rely on the stability of exact line:column spans pointing into libraries
(e.g. ghc-internal), as any change (such as adding a comment) can change
them.
This commit addresses this by normalising away line:column in callstacks,
but only when those point into internal libraries. We don't do this in
general, as the exact span might be important to the test (e.g. for a
span within the test module itself).
Fixes #27387
- - - - -
81ee62e0 by Alan Zimmerman at 2026-07-02T21:36:33-04:00
EPA: Remove LocatedLW from MatchGroup
This is the last usage of LocatedLW / SrcSpanAnnLW
- - - - -
925959db by Recursion Ninja at 2026-07-04T04:14:12-04:00
Decoupling 'L.H.S' from 'GHC.Hs.Doc'
* Migrated 'GHC.Hs.Doc' and 'GHC.Hs.DocString' AST defintions from 'GHC.*' namespace,
to new 'Language.Haskell.Syntax.Doc' module in the 'L.H.S' "namespace."
* Updated 'HsDocString to be TTG-parameterised as 'HsDocString pass'.
* Added 'GHC.Hs.Extension.Pass': splits 'GhcPass'/'Pass' and all 'HsDocString'
TTG instances out of 'GHC.Hs.Extension', which re-exports it unchanged
(this is backwards compatible and prevents the introduction of a boot file).
* Deleted 'GHC.Hs.Doc.hs-boot'; removed all 'L.H.S.*' imports of 'GHC.Hs.Doc'.
* Updated 'GHC.Hs.DocString' to be TTG pass-parameterised throughout; moved
'mkHsDocStringChunk'/'unpackHDSC' here (require 'GHC.Utils.Encoding').
* Split 'GHC.Rename.Doc.rnHsDoc' from 'rnHsDocIdentifiersOnly'.
* Updated parser, renamer, typechecker, HIE, and exact-print for new types.
* Added 'HsDocString' TTG instances for 'DocNameI' to 'Haddock.Types'.
* Killed the last module loop between GHC.* and LHS.*.
- Only edges from LHS.* to GHC.Data.FastString now!
Resolves #26971
- - - - -
b7e24044 by mangoiv at 2026-07-04T04:14:56-04:00
ci: retry fetching test metrics
Retry fetching test metrics to make the CI not fail if the services is
temporarily unavailable
- - - - -
4180af3f by Zubin Duggal at 2026-07-04T04:15:38-04:00
Bump semaphore-compat submodule to 2.0.1
This versions includes some cruicial fixes for darwin
- - - - -
242d4317 by sheaf at 2026-07-04T04:16:19-04:00
Remove outdated comment in GHC.Data.ShortText
There was a long comment in GHC.Data.ShortText about a workaround that
was necessary when bootstrapping with GHC 9.2 and below. The actual
logic has since been dropped, but the comment remained. This commit
removes the vestigial comment.
- - - - -
9b714c4c by Zubin Duggal at 2026-07-05T09:40:36+05:30
CorePrep: Don't speculatively evaluate bindings that we have already discovered to be absent
In #25924, we segfault because speculation forces a projection out of a RUBBISH dictionary
(which we generated because it absent).
Solution: Don't speculate on bindings we already know are absent.
Fixes 25924
- - - - -
4a59b3ee by Zubin Duggal at 2026-07-05T09:40:36+05:30
Don't make absent fillers for terminating types
In #25924 we discovered that we could speculatively evaluate an absent filler
for a dictionary, and project a field (a superclass selector) out of it,
resulting in segfaults.
Solution: Never make an absent filler or rubbish literal for a terminating type
like a dictionary. mkAbsentFiller returns Nothing for isTerminatingType, so
worker/wrapper and the specialiser keep the real argument instead.
Some small metric decreases because we do a little less work in the
simplifier now.
Metric Decrease:
T9872a
T9872b
T9872c
TcPlugin_RewritePerf
- - - - -
383ddcd4 by Alan Zimmerman at 2026-07-06T07:08:16-04:00
EPA: Move the 'where' annotation for PatSynBind
This allows us to move it out of the MatchGroup exact print annotation
too
- - - - -
66d1a5d5 by fendor at 2026-07-07T16:57:56-04:00
Add 'backendInfoTableMapValidity' backend predicate
Check whether the backend supports the `-finfo-table-map` flag and
ignore it otherwise.
Improve by-design documentation of `backendCodeOutput`.
`Backend` is **abstract by design**. Make this clearer in
`backendCodeOutput` which is incorrectly being used as a proxy for
`Backend`.
Instead, define the desired property predicates in GHC.Driver.Backend
In the process, make `backendCodeOutput` total.
- - - - -
74f1071d by fendor at 2026-07-07T16:57:56-04:00
Add failing test for `-finfo-table-map` and bytecode backend
If you compile a module using the bytecode backend, with
-finfo-table-map, then the info table map doesn't get populated for the
module.
This is because the -finfo-table-map code path is implemented mostly in
the StgToCmm phase which isn't run when creating bytecode.
Ticket #27039
- - - - -
28d63bca by mangoiv at 2026-07-07T16:59:16-04:00
ci: don't fail nightly if there have been no changes that night
Fixes #27127
- - - - -
4ebfc478 by Rodrigo Mesquita at 2026-07-08T04:47:53-04:00
ttg: Using ShortText over FastString in the AST
To make the AST independent of GHC, this commit replaces usages of
`FastString` with `HText` in the AST, killing the last edge from
Language.Haskell.* to GHC.* modules.
Even though we /do/ want to use FastStrings in general -- critically in
Names or Ids -- there is no particular reason for the FastStrings that
occur in the AST proper to be FastStrings. Strings in the AST are
typically unique and don't benefit particularly from being interned
FastStrings with Uniques for fast comparison.
`HText` is a type synonym for `ShortText` which uses GHC's Modified
UTF-8 encoding exclusively.
Modified UTF-8 must be used to represent the Haskell AST because the
Haskell Report allows surrogate code points. `Data.Text.Text` functions
use Standard UTF-8 which replace surrogates with a placeholder value,
thus `Data.Text.Text` is unsuitable for AST strings. See the
`Language.Haskell.Syntax.Text` module header for more details.
Final progress towards #21592
Closes #21628
- - - - -
d910b353 by Simon Peyton Jones at 2026-07-08T04:48:36-04:00
Update equality-type documenation in GHC.Builtin.Types.Prim
Fix #27466
- - - - -
b2530542 by Simon Peyton Jones at 2026-07-08T04:48:36-04:00
Honour -dsuppress-coercions in GHC.Core.TyCo.pprCo
Fixes #27467
- - - - -
9a73179a by Facundo Domínguez at 2026-07-08T04:49:26-04:00
Add item to MR checklist asking to squash fixup commits after approval
The checklist has an item that reads
All commits are either individually buildable or squashed.
This item could be checked immediately after sending the merge request
though. If reviewers ask for amends later on, and the author amends
the merge request, there was no item that would remind the contributors
to squash the fixup commits before landing.
This commit adds a new item
After all approvals and before landing: all fixup commits are squashed with their originating commits.
which should be harder to mark as done before approvals have been given.
- - - - -
ed09895d by Andreas Klebinger at 2026-07-08T16:53:27-04:00
Fix a profiling race condition resulting in segfaults.
StgToCmm: Don't assume tagged FUN closures in closureCodeBody.
When entering a closure the self/node pointer might not be tagged in
some situations when a thunk is evaluated by multiple threads.
So we most AND away the tag bits rather than subtracting an expected tag.
Apply.cmm: Fix a race condition occuring when a thunk is mutated during GC.
In stg_ap_0_fast when might need to run GC before entering a thunk. If this happens
another thread or the GC itself might mutate the closure making entering it no longer
valid. We now check for this.
Add test and changelog for #27123 fixes.
- - - - -
67c03eb2 by Cheng Shao at 2026-07-08T16:54:09-04:00
ghc-heap: fix invalid srtlen returned by peekItbl when no-TNTC
This patch fixes the no-TNTC code path of `peekItbl` so that it looks
at the right memory address when reading the `srt` field from the
`StgInfoTable_` struct. Also adds a `T27465` regression test that
reproduces the bug on no-TNTC builds before the fix. Fixes #27465.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
2ecabb4f by Zubin Duggal at 2026-07-09T09:23:25-04:00
hadrian: binary-dist-dir should not be the default target
Revert behaviour to pre 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2
In 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2, we applied the following behaviour change:
```
hadrian: Build stage 2 cross compilers
...
* hadrian: Make binary-dist-dir the default build target. This allows us
to have the logic in one place about which libraries/stages to build
with cross compilers. Fixes #24192
```
This is a major regression to development experience, a plain hadrian/build
--freeze1 now takes ages because we rebuild all docs (which need to go in the
binary dist dir).
`binary-dist-dir` is the wrong default target for regular GHC development work
Fixes #27445
- - - - -
e16388e3 by Zubin Duggal at 2026-07-09T09:23:25-04:00
.gitignore: Add the hadrian system.config introduced by commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2
Since
commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2
Author: Matthew Pickering <matthewtpickering(a)gmail.com>
Date: Thu Dec 21 16:17:41 2023 +0000
hadrian: Build stage 2 cross compilers
./configure produces /hadrian/cfg/system.config.{host,target}
Add these to .gitignore
- - - - -
7e8abf41 by Alan Zimmerman at 2026-07-09T09:24:12-04:00
EPA: Replace AnnListItem with simply [TrailingAnn]
Remove the unnecessary wrapper around a single field.
- - - - -
29032f17 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Keep real reason for fragile test failures
- - - - -
c34e03a7 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Fall back to the failure reason for empty JUnit bodies
- - - - -
409d40f0 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Show output diffs in JUnit output
Also refactor compare_outputs to return essentially a `Maybe Diff`
(`CompareOutput`) instead of a bool, but more pythonic. This
allows us to pass the diff through nice.
- - - - -
06fee1ab by Zubin Duggal at 2026-07-09T09:24:58-04:00
perf notes: include stat deviation and acceptance window in notes so they show up in gitlab
- - - - -
57c0f32c by mangoiv at 2026-07-10T11:08:38-04:00
driver: enable -finter-module-far-jumps by default
this fixes a compatibility bug with certain binutils/gcc versions where
we were seeing jump offset overflow errors.
This commit can probably reverted if we stop supporting the problematic
binutils/gcc verions (2.44 and 14.2, respectively)
Reolves #26994
- - - - -
4396a6f2 by Andrea Vezzosi at 2026-07-10T11:09:25-04:00
[Fix #27287] preserve ModBreaks in ModIface
- - - - -
ed261a7e by Cheng Shao at 2026-07-14T17:59:38-04:00
hadrian: fix HLS support
This patch fixes hadrian's HLS support so one can rely on HLS when
working on the hadrian codebase. Fixes #27480.
Not building/linking shared libraries for hadrian is a severely
premature optimization; this top-level setting in `cabal.project` only
affects home packages while the dependencies in the cabal store are
built with vanilla/dynamic anyway, and even adding dynamic builds to
home packages would not be costly due to cabal's usage of
`-dynamic-too`.
- - - - -
eee8ec5b by Cheng Shao at 2026-07-14T18:00:20-04:00
compiler: fix miscompiled %load_relaxed, add missing %store_relaxed
This patch fixes the %load_relaxed cmm primop compilation logic to
correctly use relaxed memory ordering, and adds the missing
%store_relaxed primop. Parsing logic of %load/%store with explicit
ordering is covered in the AtomicFetch test case. Fixes #27483.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
1718230f by Alan Zimmerman at 2026-07-14T18:01:06-04:00
EPA: Keep binds and sigs together in HsValBindsLR
We combine them into a single list for GhcPs, wrapped in the
ValBind data type, which is the bind equivalent of ValD, having
constructors for binds and sigs.
This simplifies exact print processing, especially when using it to
update the contents of local binds, as we no longer need AnnSortKey
BindTag
- - - - -
6bd1ad2a by Andreas Klebinger at 2026-07-14T18:01:49-04:00
Bump nofib submodule to account for MonoLocalBinds.
New versions of GHC enable MonoLocalBinds by default.
This breaks some of the benchmarks. I've fixed this and
this bump pulls in that fix.
- - - - -
7eb0f1c9 by Cheng Shao at 2026-07-14T18:02:31-04:00
testsuite: fix bytecodeIPE test under +ipe flavours
This patch fixes the bytecodeIPE test under +ipe flavours. It used to
fail under +ipe because the RTS is built with IPE info, then
stg_AP_info in RTS carries IPE info, so whereFrom wouldn't return
Nothing. Now the test checks IPE info of a datacon in the ghci-loaded
module which is not affected by whether the RTS is built with IPE info
or not. Fixes #27498.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
ef038aae by cydparser at 2026-07-15T04:35:41-04:00
Reduce bytes allocated for `capabilities` in RTS (fixes #27487)
In rts/Capability.c, `capabilities` is an array of pointers, but it was allocated as if it were an
array of Capability's.
- - - - -
d377e83e by Cheng Shao at 2026-07-15T04:36:27-04:00
rts: fix missing UNTAG in stg_readTVarIOzh
This patch fixes missing UNTAG on the current value closure read from
StgTVar. UNTAG is a no-op when it's stg_TREC_HEADER_info which is word
aligned; it may be a tagged closure, and reading info table from the
tagged address is an unaligned load which may cause issues on
platforms with strict alignment requirements.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
8ed03842 by Cheng Shao at 2026-07-15T04:36:27-04:00
rts: fix missing UNTAG in stg_control0zh_ll
This patch fixes missing UNTAG on the cont closure returned by
captureContinuationAndAbort. In case it's not NULL,
captureContinuationAndAbort returns a tagged StgContinuation closure,
in which case it must be untagged before accessing the
apply_mask_frame field.
In the past it worked out of luck: when apply_mask_frame was NULL then
mask_frame_offset is also 0 so the control flow didn't diverge to a
wrong path. Still, this is horribly wrong and will crash once
StgContinuation struct is refactored and fields are shuffled around.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
5aa7000a by Cheng Shao at 2026-07-15T04:37:08-04:00
compiler: fix redundant AP thunk codegen when not using -ticky-ap-thunk
This patch fixes a double negation confusion in !7525 that results in
some redundant AP thunk code generation when not using
-ticky-ap-thunk. Now, we use `stgToCmmUseStdApThunk` to indicate
whether precomputed AP thunks in the RTS should be used, which
defaults to `True`, unless `-ticky-ap-thunk` is passed.
`-finfo-table-map` now also implies `-ticky-ap-thunk`, since when
doing IPE profiling we want the generated AP thunks to be unique.
Fixes #27502.
-------------------------
Metric Decrease:
T3064
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
d43a7b7a by Brian McKenna at 2026-07-15T20:10:04+02:00
Strip ticks when desugaring bool guards
The special `considerAccessible` pattern was broken when compiling
with debug info. Compiling with debug info wraps expressions with
`SourceNote` ticks, which broke the internals of the
`desugarBoolGuard` function. Ticks are now ignored within this
function.
Fixes #27360
- - - - -
ede4b17b by Ben Gamari at 2026-07-15T22:59:53-04:00
base: Display ExceptionContext in WhileHandling's textual description
As originally-implemented the implementation for
`WhileHandling(displayExceptionAnnotation)` would display the
`ExceptionContext` of the exception which it carries (as this was the
behavior of `displayException`, in terms of which
`displayExceptionAnnotation` was implemented).
However, in 284ffab3 the definition of `SomeException(displayException)`
was changed to exclude the `ExceptionContext`. This means that
`WhileHandling(displayExceptionAnnotation)` fails to describe the
provenance of the exception which it captures, greatly limiting its
utility.
Return the implementation to its originally-specified behavior by
implementing `WhileHandling(displayExceptionAnnotation)` in terms of
`displayExceptionWithInfo`.
Fixes #27456.
- - - - -
0f64f348 by Cheng Shao at 2026-07-16T15:41:08+00:00
ci: add missing docker permission workaround in abi-test job
- - - - -
660cb239 by Cheng Shao at 2026-07-16T19:37:48+00:00
bindist: Fix make install -j race condition on macos/freebsd
This patch fixes make install -j race condition on macos/freebsd. BSD
install fails with EEXIST when multiple install processes concurrently
create the same prefix directory. So we add an `install_dirs`
prerequisite job that sequentially creates the directories for
subsequent jobs to work with. Fixes #27499.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
08130257 by Cheng Shao at 2026-07-16T19:37:48+00:00
ci: run bindist make install with -j
This patch makes the ci scripts run `make install` with `-j` to reduce
wall clock time when installing the bindist, see related issue for
benchmark numbers. This only affects ghc ci logic, the user-facing
default is up to distributors and is still `-j1`. Closes #27029.
- - - - -
d5ae6906 by Adam Gundry at 2026-07-17T04:57:43-04:00
Mark various language extension flags as deprecated (see #27329)
The following language extensions are now deprecated:
- AlternativeLayoutRule
- AlternativeLayoutRuleTransitional
- ParallelArrays
- PolymorphicComponents
- Rank2Types
In addition, the warning `-Walternative-layout-rule-transitional`
has been marked as deprecated, as it is emitted only under the
deprecated extension `XAlternativeLayoutRuleTransitional`.
- - - - -
fe3b059c by Andrew Lelechenko at 2026-07-17T04:58:26-04:00
base: re-export GHC.Environment.getFullArgs from System.Environment
CLC proposal https://github.com/haskell/core-libraries-committee/issues/431
- - - - -
722236dd by sheaf at 2026-07-18T08:48:31-04:00
Coercion optimisation: avoid double-Sym for InstCo
Ticket #27374 pointed out an issue with GHC.Core.Coercion.Opt.optCoercion's
handling of InstCo: it contravened (LC2) in Note [The LiftingContext in optCoercion]
because it applied the ambient 'sym' to a coercion that was then added
to the lifting context substitution.
Fixes #27374
Co-authored-by: Simon Jakobi <simon.jakobi(a)gmail.com>
- - - - -
ff70fc75 by sheaf at 2026-07-18T08:48:31-04:00
Coercion optimisation: avoid exponential behaviour
The change to coercion optimisation of 'InstCo' in the previous commit
introduces exponential behaviour to the coercion optimiser. To avoid
this, this commit provides a way to push in 'Sym' of an already-optimised
coercion: GHC.Core.Coercion.Opt.mkDeepSymCo.
See Note [Pushing Sym without re-optimising] in GHC.Core.Coercion.Opt.
- - - - -
dfef27f0 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Move THREADED_RTS-conditional struct members to end of Capability
Accessing members of the Capability struct from CMM code rely on
accessor macros. (The macros are generated by deriveConstants).
These macros have a single definition. This means that the offsets of
all struct members must *not* vary based on THREADED_RTS vs
!THREADED_RTS. This requires that any struct members that are
conditional on THREADED_RTS must occur after the unconditional struct
members. Hence we move all the ones that are conditional on
THREADED_RTS to the end.
Add a deriveConstants entry for the iomgr member of the Capability
struct, which was the motivation for this change.
Add warning messages to help our future selves. Debugging this took me
a couple hours in gdb!
- - - - -
c254e022 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Make the IOManager API use CapIOManager rather than Capability
This makes the API somewhat more self-contained and more consistent.
Now the IOManager API and each of the backends takes just the I/O
manager structure. Previously we had a bit of a mixture, depending on
whether the function needed access to the Capability or just the
CapIOManager.
We still need access to the cap, so we introduce a back reference to
reach the capability, via iomgr->cap.
Convert all uses in select and poll backends, but not win32 ones.
Convert callers in the scheduler and elsewhere.
Also convert the three CMM primops that call IOManager APIs. They just
need to use Capability_iomgr(MyCapability()).
- - - - -
4f3d8f31 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Split posix/MIO.c out of posix/Signals.c
The MIO I/O manager was secretly living inside the Signals file.
Now it gets its own file, like any other self-respecting I/O manager.
- - - - -
52ce04a9 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Rationalise some scheduler run queue utilities
Move them all to the same place in the file.
Make some static that were used only internally.
Also remove a redundant assignment after calling truncateRunQueue that
is already done within truncateRunQueue.
- - - - -
75bbdebc by Duncan Coutts at 2026-07-18T08:49:12-04:00
Rename initIOManager{AfterFork} to {re}startIOManager
These are more accurate names, since these actions happen after
initialisation and are really about starting (or restarting) background
threads.
- - - - -
724c0517 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Free per-cap I/O managers during shutdown and forkProcess
Historically this was not strictly necessary. The select and win32
legacy I/O managers did not maintain any dynamically allocated
resources. The new poll one does (an auxillary table), and so this
should be freed.
After forkProcess, all threads get deleted. This includes threads
waiting on I/O or timers. So as of this patch, resetting the I/O
manager is just about tidying things up. For example, for the poll
I/O manager this will reset the size of the AIOP table (which
otherwise grows but never shrinks).
In future however the re-initialising will become neeecessary for
functionality, since some I/O managers will need to re-initialise
wakeup fds that are set CLOEXEC.
- - - - -
c007d122 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a TODO to the MIO I/O manager
The direction of travel is to make I/O managers per-capability and have
all their state live in the struct CapIOManager. The MIO I/O manager
however still has a number of global variables.
It's not obvious how handle these globals however.
- - - - -
b65ab7b3 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a FIXME note in the Poll I/O manager
- - - - -
daf2bd6f by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add missing updateRemembSetPushClosure in poll I/O manager
For the non-moving GC.
- - - - -
e33ca830 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Minor doc improvement to struct StgAsyncIOOp member outcome
Mention the enumeration names, as well as their numeric values. The rest
of the code uses the enum names.
- - - - -
4edd2579 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Minor doc improvements for StgTSOBlockInfo
Clarify that certain union members are used only by certain legacy
I/O managers. Hopefully we will be able to remove these at some point.
- - - - -
536bedbb by Duncan Coutts at 2026-07-18T08:49:12-04:00
Avoid exporting various win32-specific rts symbols
The BeginPrivate.h / EndPrivate.h scheme works perfectly well on
Windows, but all of the rts/win32/*.h files were not using it.
- - - - -
8139b5ac by Duncan Coutts at 2026-07-18T08:49:12-04:00
Remove wakeupIOManager, ioManagerWakeup and setIOManagerWakeupFd
We no longer need wakeupIOManager for the threaded RTS case, so we can
remove it and the bits only needed to support it. This includes the
pipe/eventfd fd shared between the RTS and the in-library I/O manager
used for waking up the I/O manager thread. The pipe/eventfd still
exists, but it no longer has to be communicated to the RTS, since the
RTS no longer needs to use it.
So we remove the RTS API export setIOManagerWakeupFd, and remove uses of
it within the I/O managers in ghc-internal.
- - - - -
74fe7c66 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a new interruptIOManager API for the I/O managers
It will be used to interrupt awaitCompletedTimeoutsOrIO. Also update the
return type and docs for awaitCompletedTimeoutsOrIO to have it return
false when it gets interrupted, and have no useful post condition in
that case.
- - - - -
38792843 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for select I/O manager
Uses the FdWakup mechanism.
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2f3b00aa by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for poll I/O manager
Uses the FdWakup mechanism.
A quirk we have to cope with is that we now need to poll one more fd --
the wakeup_fd_r -- but this fd has no corresponding entry in the
aiop_table. This is awkward since we have set up our aiop_poll_table to
be an auxilliary table with matching indicies.
The solution this patch uses (and described in the comments) is to have
two tables: struct pollfd *aiop_poll_table, *full_poll_table;
and to have the aiop_poll_table alias the tail of the full_poll_table.
The head entry in the full_poll_table is the extra fd. So we poll the
full_poll_table, while the aiop_poll_table still has matching indicies
with the aiop_table.
Hurrah for C aliasing rules.
- - - - -
cee50131 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for win32 legacy I/O manager
And remove unused related helper resetAbandonRequestWait. It is not
called because the event is created in auto-reset mode, so never needs
to be reset manually.
- - - - -
cf453143 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Note lack of interruptIOManager support for WinIO I/O manager
Though there's a plausible design, we can't sanely test it at the moment
due to related WinIO bugs. Filed as issue #27403.
- - - - -
1b74a0ad by Duncan Coutts at 2026-07-18T08:49:13-04:00
Be more explicit about enum IOReadOrWrite values, and type within cmm
Belt and braces.
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b388d093 by Brian McKenna at 2026-07-18T17:51:50-04:00
Ignore ticks in the pattern-match term oracle
The term-oracle in the pattern-match checker is keyed by a canonical
form of the scrutinee, computed by `makeDictsCoherent`. That canonical
form was tick-sensitive: two occurrences of an otherwise identical
expression that happened to carry different ticks were treated as
distinct values, breaking long-distance information.
This shows up in practice under `-finfo-table-map`, because the
desugarer wraps every record-selector use site in a `SourceNote`
carrying that site's span. For example:
data Box = Box { unBox :: Maybe Int }
f b = case unBox b of
Nothing -> 0
Just _ -> let Just x = unBox b in x
The two `unBox b` expressionss carry different SourceNote spans, the
pattern-match checker sees them as different, the long-distance
information from the outer `Just _` branch never reaches the
let-pattern, and `Just x = unBox b` is wrongly reported as
non-exhaustive.
We now strip all ticks in `makeDictsCoherent`. This is documented as
Wrinkle (UD1) of Note [Unique dictionaries in the TmOracle CoreMap].
Fixes #27314
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c23e1acb by Mrjtjmn at 2026-07-18T17:52:45-04:00
Add explanations for unsolved Typeable constraints
This commit adds explanations for unsolved 'Typeable' constraints.
GHC will now provide additional explanations for an unsolved constraint
of the form 'Typeable ty', explain why GHC did not solve Typeable constraint.
e.g.:
- 'ty' is a polymorphic type (e.g. forall a. a -> a)
- 'ty' is a qualified type (e.g. Eq Int => Int)
- 'ty' is an unboxed sum type
- 'ty' is an unreduced type family application
- 'ty' whose kind is not typeable
Fixes #26532
- - - - -
cbef021e by Artem Pelenitsyn at 2026-07-19T07:49:55-04:00
ghc-internal: Lock.hs: fix typo and indentation
- - - - -
42918646 by Duncan Coutts at 2026-07-19T07:50:36-04:00
Fix failing test GcStaticPointers for non-moving GC
Minor mistake in asserting something before checking for that same
thing.
Specifically, Bdescr asserts HEAP_ALLOCED_GC, but Bdescr was being used
prior to a guard that checks HEAP_ALLOCED_GC. The solution is just to
move the use of Bdescr after the guard.
Thanks to Simon Jakobi for identifying the problem.
- - - - -
c2f6dcd4 by Sasha Bogicevic at 2026-07-20T10:31:56+02:00
Improve error messages for invalid record wildcards
Record wildcard hints are now shown in more contexts and include
constructor arity; matching with `..` on a fieldless constructor
now produces a dedicated error message.
Fixes #21101
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4c02e76b by Duncan Coutts at 2026-07-21T10:37:21-04:00
Mark test T27105 as fragile, citing issue #27522
Scheduler fairness is fine, except when it isn't. And it isn't on CI
machines surprisingly often! See the issue for details.
- - - - -
43dd2b15 by Recursion Ninja at 2026-07-21T17:09:53-04:00
Resolving many TTG related orphan type-class instances
This is part a technical debt removal effort made possible now
that separating out the AST via TTG has come to a close.
As the AST in 'L.H.S' has been incrementally separated from the GHC internals,
there are many accumulated orphan instance of 'Binary', 'NFData', 'Outputable',
and 'Uniquable'. The orphan instance of data-types from within 'L.H.S' have had
their orphan instances moved to either:
1. The module which defines the data-type
2. The module which defines the type-class;
i.e. moving an orphan 'Binary' instance to 'GHC.Utils.Binary'
Orphan instances resolved (37):
| Data-type | Resolved instance(s) | Former orphan module(s) |
| -------------------- | -------------------------- | ------------------------- |
| Role | Binary, NFData, Outputable | GHC.Core.Coercion.Axiom |
| SrcStrictness | Binary, NFData, Outputable | GHC.Core.DataCon |
| SrcUnpackedness | Binary, NFData, Outputable | GHC.Core.DataCon |
| Fixity | Binary, Outputable | GHC.Hs.Basic |
| FixityDirection | Binary, Outputable | GHC.Hs.Basic |
| LexicalFixity | Outputable | GHC.Hs.Basic |
| CCallTarget | NFData | GHC.Hs.Decls.Foreign |
| CType | NFData | GHC.Hs.Decls.Foreign |
| Header | NFData | GHC.Hs.Decls.Foreign |
| OverlapMode | Binary, NFData | GHC.Hs.Decls.Overlap |
| WithHsDocIdentifiers | NFData, Outputable | GHC.Hs.Doc |
| HsDocString | NFData | GHC.Hs.DocString |
| HsDocStringChunk | Binary, Outputable | GHC.Hs.DocString |
| HsDocStringDecorator | Binary, Outputable | GHC.Hs.DocString |
| NamespaceSpecifier | Outputable | GHC.Hs.ImpExp |
| ForAllTyFlag | Binary, NFData, Outputable | GHC.Hs.Specificity |
| Specificity | Binary, NFData | GHC.Hs.Specificity |
| PromotionFlag | Binary, Outputable | GHC.Types.Basic |
| FieldLabelString | Outputable, Uniquable | GHC.Types.FieldLabel |
| InlinePragma | Binary | GHC.Types.InlinePragma |
-------------------------
Metric Decrease:
hard_hole_fits
-------------------------
Closes #21262, #27469
- - - - -
ab9ab895 by Cheng Shao at 2026-07-21T17:10:53-04:00
rts: always use StgInt to represent cost center id
Currently cost center id is modeled as `Int` and it should be `StgInt`
uniformly in the RTS, hence this patch. Fixes #27524.
- - - - -
94d8f83b by Cheng Shao at 2026-07-22T11:30:40-04:00
hadrian: clean up stale cabal package flags in the tree
This patch cleans up stale cabal package flags in the tree and related
hadrian/autoconf logic. Closes #27474.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
0bf1d8c9 by Sasha Bogicevic at 2026-07-22T11:31:21-04:00
parser: don't suggest ImportQualifiedPost when it is already enabled
-Wprepositive-qualified-module unconditionally attached a hint to
enable ImportQualifiedPost, even when the extension was already on
(as it is by default under GHC2021). Record the extension's state in
the PsWarnImportPreQualified diagnostic and drop the hint when it is
already enabled.
Fixes #27380
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700a1dd1 by Simon Jakobi at 2026-07-23T11:21:20-04:00
ci: Reduce lint job setup costs
Avoid fetching unnecessary history and submodules for lightweight lint
jobs. Run changelog validation without Hadrian.
Because the lint-author job is now based on the .lint template directly,
we enhance it to allow Git to read from the runner-owned checkouts,
In the previously used .lint-params template, this permissions issue was
addressed via `chown`.
Closes #27521.
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
26a44fb0 by ARATA Mizuki at 2026-07-23T11:22:10-04:00
testsuite: Fix memory issues of doublex2_* and simd010
doublex2_* had reads from uninitialized memory.
simd010 had out-of-bounds array access.
Fixes #27544
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4d798b17 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Eliminate STM_AWOKEN
It was used as nullary closure for the block_info.closure in the case of
a thread being awoken after an STM transaction.
However, while it was written, it was never read, so contributed nothing
to the behaviour. Furthermore, in the only place it was set (in
tryWakeupThread) the why_blocked was immediately overwritten by the
NotBlocked status, and the block_info was updated accordingly (by
appendToRunQueue).
So it didn't even serve a purpose of clarifying an intermediate state,
there really was no such intermediate state.
Cleaning this up will allow the BlockedOnSTM case to follow the same
pattern as the other why_blocked cases that do not use the block_info,
and in turn this reduces the number of different categories.
- - - - -
e1cece79 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Document that eventlog thread stop code ThreadBlocked is no longer used
It has not been used since GHC 7.0.x (2011). In 7.2 all the BlockedOn*
codes were added, and these were and are used instead of ThreadBlocked.
- - - - -
795db115 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a proper mapping to eventlog external thread stop status
That is the mapping from rts-internal codes, to the coes used in the
status field in the eventlog EVENT_STOP_THREAD event.
See issue #9003 for what goes wrong when we mess this up. In that
ticket, people note that we should really not require the internal
tso->why_blocked codes to leak into the external eventlog thread stop
codes. The same principle applies to the StgThreadReturnCode.
This change properly separates them, and explicitly maps between them
using a pair of (compact, constant) tables. These tables are pretty
small (with no alignment constraints) and will soon shrink so it seems
a sensible tradeoff.
We also introduce and use proper EVENT_STOP_THREAD constants in the
event log format header. Previously there was not specification in the
code for these (only in the docs): the values were encoded into the
conversion code.
This will allow us to renumber the internal why_blockd codes without
breaking the eventlog output.
- - - - -
6f1c8efa by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove unused tso->block_info.wakeup member
Presumably it was used once, but not now.
- - - - -
740b88a9 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Document StgTSOBlockInfo to say what cases use what members
In principle, tso->why_blocked is the tag for the StgTSOBlockInfo union,
so we should be able to say for each union member the why_blocked cases
that use that member.
- - - - -
5b92eae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a tso->block_info.mvar member and use it
in preference to the generic block_info.closure union member, with
casts.
The plan is that when we know what case we're in (via tso->why_blocked)
then we can always access the correct union member, and so we will only
need to access block_info.closure for generic cases where we don't know
or don't care.
- - - - -
d931715f by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a tso->block_info.unused member and use it
in preference to the generic block_info.closure union member, with
casts.
The plan is that when we know what case we're in (via tso->why_blocked)
then we can always access the correct union member, and so we will only
need to access block_info.closure for generic cases where we don't know
or don't care.
- - - - -
47e28ebb by Duncan Coutts at 2026-07-23T17:26:18-04:00
Avoid storing to tso->block_info.closure
In one case we can use a specific union member (.prev) instead. In
several cases the stores were in fact redundant because of subsequent
overwrites.
In scavengeTSO we replace setting tso->block_info.closure to a valid
closure, with an assertion that the block_info.unused is already set to
END_TSO_QUEUE which is a valid (static) closure.
- - - - -
96e4749d by Duncan Coutts at 2026-07-23T17:26:18-04:00
Renumber the tso->why_blocked constants
We can do this now because we have separated the internal values from
the external ones used in the eventlog.
This lets us put them back into a deliberate order and consolodate some
gaps.
More importantly, it is a prepation for a slightly more sophisticated
encoding.
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8f62661c by Duncan Coutts at 2026-07-23T17:26:18-04:00
Define constants for the existing stg_threadStatuszh return codes
The stg_threadStatuszh reuses the internal tso->why_blocked codes but
also extends them with a couple previously magic values. This is awkward
since we need to know what those magic values are so we don't
accidentally use those values to mean something else. By pulling a
definition up to where the why_blocked codes are defined we will be able
to avoid mistakenly assining those codes some meaning (or just changing
the BlockedThreadComplete, BlockedThreadKilled code if necessary).
- - - - -
42c69ae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Extend the tso->why_blocked encoding to indicate block_info closures
We use some bit tricks to cheaply and generically test if a
tso->why_blocked tag implies that the corresponding tso->block_info will
contain a non-trivial valid closure (i.e. not just block_info.unused set
to END_TSO_QUEUE).
In particular we arrange for most why_blocked values to naturally have a
distinguishing bit, but for the BlockedOn{Read,Write,Delay} cases, they
can come in either non-closure or closure forms. We allow an additional
bit to distinguish these cases. The non-closure forms are only from
legacy I/O managers: select and win32-legacy. So this extra bit
mechanism will be able to be retired once the legacy I/O managers are
themselves retired.
This means in a few places we need to untag the why_blocked value before
inspecting it, but in most places we do not.
- - - - -
7c64632b by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use BlockInfoForceNonClosure in the select I/O manager
- - - - -
8fd7104a by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use BlockInfoForceNonClosure in the win32-legacy I/O manager
for the BlockedOn{Read,Write} since these use the non-heap allocated
StgAsyncIOResult.
- - - - -
e0da603b by Duncan Coutts at 2026-07-23T17:26:18-04:00
Enforce the why_blocked and block_info rules in checkTSO
We now check the cases wher IsBlockInfoClosure should hold, the cases
that are supposed to use block_info.unused == END_TSO_QUEUE, and which
cases are allowed to use BlockInfoForceNonClosure.
This partially enforces the use of why_blocked as a tag for the
block_info union. We could be stricter and check for the correct
expected info table for the closure cases.
- - - - -
1dd0f381 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use IsBlockInfoClosure to simplify several tests
In GC and generic traversal we need to know if we should look at the
block_info.closure or not. Now we can do just that using a cheap bit
test on the why_blocked tag.
This fixes issue 26717, where the problem was that some GC modes did not
know when to look at block_info.closure, because the poll I/O manager
uses a closure for BlockedOn{Read,Write} while the select I/O manager
uses a non-closure. Now this information is in the why_blocked tag
itself.
- - - - -
7a00ffbc by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove the now-unused scavengeTSOIOManager
The GC no longer has to delegate to the I/O manager, since it can use
IsBlockInfoClosure to decide things itself.
- - - - -
522a481f by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove duplicate assertion
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0874d965 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Follow atomic access rules more consistently for tso->why_blocked
The rule is this:
store block_info *before* why_blocked
store why_blocked using store release
load why_blocked using load acquire
load block_info *after* why_blocked
This is a an atomic store release / load acquire pair and (if the reads
are in a separate thread to the writes, and the read receives the value
stored) then this guarantees a full "happens before" relationship of
these stores and loads.
In some cases, we do not need a full load acquire, because we don't read
the block_info at all and so do not need any ordering. In this case we
just need an atomic relaxed load.
This was being followed in most places, but not all. If there's good
reason in any case that we don't need atomic access, then we should
document that in a comment. In the absence of that I think it's easier
to follow the rule everywhere.
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8f0bdbe1 by Duncan Coutts at 2026-07-23T17:26:19-04:00
Add a changelog entry
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4fdfe757 by Alan Zimmerman at 2026-07-23T17:27:06-04:00
EPA: Keep decls together in ClassDecl
Similar to 1718230f4d3d19d8c49c0e5d496cb0fb6f399528 for HsValBindsLR,
this commit updates ClassDecl so that it no longer splits out the
assorted `LHsDecl GhcPs` until the renamer.
It does this by inserting a type family (separate from the classic TTG one) for this.
So
data TyClDecl
...
| ClassDecl {
...
tcdDecls :: XClassDecls pass
with
type instance XClassDecls GhcPs = [LHsDecl GhcPs]
type instance XClassDecls GhcRn = ClassDeclX GhcRn
type instance XClassDecls GhcTc = ClassDeclX GhcTc
data ClassDeclX pass
= ClassDeclX { tcdSigs :: [LSig pass], -- ^ Methods' signatures
tcdMeths :: LHsBinds pass, -- ^ Default methods
tcdATs :: [LFamilyDecl pass], -- ^ Associated types;
tcdATDefs :: [LTyFamDefltDecl pass], -- ^ Associated type defaults
tcdDocs :: [LDocDecl pass] -- ^ Haddock docs
}
- - - - -
f586c885 by Simon Jakobi at 2026-07-24T18:05:00-04:00
ci: Use shallow submodule clones by default
Limit submodule clones to depth one to reduce CI checkout costs. Keep
fetching full submodule history for the submodule lint jobs, which
inspect commits across a range.
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
306120d2 by Duncan Coutts at 2026-07-24T18:05:43-04:00
Fix flaky test T3994 on FreeBSD
On current FreeBSD versions, calling getpgid on a zombie process fails.
In T3994, if we're really unlucky with delays and scheduling then we can
end up in exactly that situation.
Just catch that specific exception and ignore it. It's rare, and not our
fault.
- - - - -
7b116a0b by Cheng Shao at 2026-07-24T18:06:24-04:00
ci: add missing workaround for docker permissions in lint jobs
Some lint jobs use ci-images with default user `ghc`, and the gitlab
ci docker executor requires the `sudo chown` workaround to fix
workspace directory permission issue. This patch adds the missing
workarounds for the lint jobs. Fixes #27554.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
815149f3 by Andrzej Rybczak at 2026-07-25T15:06:43+00:00
Add -Wdefaulted-callstack
Adds a new warning, -Wdefaulted-callstack, which warns when an implicit
CallStack parameter is defaulted to the empty stack. In particular, this
includes call sites where a function with a HasCallStack constraint is called
from a definition that does *not* provide one. At such call sites the call stack
is cut off and does not include the enclosing definition's callers, which can be
a source of surprise if the user wants complete call stacks.
Closes #27077.
- - - - -
f6f2343f by Zubin Duggal at 2026-07-25T17:40:51-04:00
UniqueDFM: alter should preserve insertion order
Before it always inserting new elements at the end.
This is problematic because instances get inserted into the map with
`alterF`, which can change ordering of how instances are printed
with `:info` depending on the order in which we consult interfaces
I expect `alter id k = id` and `alter (fmap f) k = adjust f k`. Moving keys to
the end breaks that (`adjust` already preserves position).
Fixes #27532
- - - - -
5d0ab71a by fendor at 2026-07-27T17:31:05-04:00
Introduce global unit database cache
As a first step for better sharing of `UnitInfo` across `UnitEnv`,
we introduce a new datatype called `ExternalUnitDatabases`.
It primarily serves as an in-memory representation of *all*
`UnitDatabase`s across `UnitEnv`. This means, if multiple `HomeUnitEnv`s
depend on the same database, one way or another, we make sure that we
don't parse from disk every time.
Instead, we store the in-memory representation in `ExternalUnitDatabases`.
`ExternalUnitDatabaseCache` is the equivalent of `ExternalUnitState` in
the `UnitEnv`. It is a mutable variable wrapping `ExternalUnitDatabases`.
The mutable `ExternalUnitDatabaseCache` is used in `initUnits` to make
sure we don't parse the same unit database multiple times.
Almost by accident, we change the semantics of `initUnits` to honour
modifications to `packageDBFlags`.
The inability to change `packageDBFlags` while also reusing the already
parsed `UnitDatabase`s was reported in #26423 as a bug.
Hence, we think this behaviour change is warranted and acceptable,
especially since it comes with a breaking change to the `initUnits` API.
Add regression test for #26423
Closes #26423
- - - - -
6cce494a by fendor at 2026-07-27T17:31:05-04:00
Introduce UnitIndex for global external unit caching
`UnitInfo`s have been observed to cause a lot of memory usage in #27500.
Especially with multiple home units, as the same (external) units are
processed from scratch, even though most of the time we end up with
exactly the same `UnitInfo`.
We introduce a `UnitEnv` global cache that allows us to store external
unit information that is used across all `HomeUnitEnv`s.
The most important change in this commit is the introduction of the `UnitIndex`.
It stores a global mapping of `UnitId` -> `UnitInfo`, and `initUnits`
always uses the cached `UnitInfo` entry to populate each
`HomeUnitEnv`'s `UnitState`.
This allows us to ensure the following property:
> Each `UnitInfo` should be alive exactly once in GHC.
All `UnitState`s should reference 'UnitInfo's stored in the 'UnitIndex'.
This ensured by calling 'initUnits' with the 'UnitIndex'.
In addition, the `ExternalUnitDatabases` may also hold a reference
to each on-disk representation of `UnitInfo`.
This means, we impose an hard upper bound on the number of `UnitInfo`s
alive in the GHC session:
> The number of alive `UnitInfo`s closure objects must be the
> sum of all loaded unit database times two.
We add performance regression tests that make sure the number of live
`UnitInfo` cannot exceed this threshold.
Closes #27500
-------------------------
Metric Decrease:
MultiComponentModules
MultiComponentModulesRecomp
MultiComponentModulesRecomp100
mhu-perf
LinkableUsage02
-------------------------
These metrics increases are especially notable, as we are not even
sharing anything big but merely the global package database with 50
entries.
It shows how careful sharing of `UnitInfo` can improve memory usage.
We expect this to be much more notable when the whole cabal package
database is shared across multiple home units.
`LinkableUsage02` metric decreases on unreg and i386 platform, only.
---
Technical details
To share the `UnitInfo`s correctly, it is important that we extract
the `WireMap` into the `UnitIndex`. At the moment of writing, `WireMap`
must be globally the same for all `HomeUnitEnv`s.
This is important, as we could otherwise not cache the "fully-resolved"
`UnitInfo`, as we don't change the `UnitId` or `unitAbiHash` when
resolving wired-in units. Thus, there could be ambiguities, when the
`WireMap` is not the same for all `UnitState`s across the `UnitEnv`.
We consider a `UnitInfo` fully-resolved, if wired-in units have been
updated, the `UnitInfo` has been validated and variables in the unit
config, such as `${pkgroot}` have been resolved.
Updating the wired-in units requires the `WireMap` to be globally the
same.
- - - - -
f8e3bee9 by Zubin Duggal at 2026-07-27T17:31:49-04:00
testsuite: skip runtime stats tests on debugged compilers
Debugged flavours build the boot libraries without optimisation, so the
runtime numbers do not match the baselines.
- - - - -
1e326770 by Zubin Duggal at 2026-07-27T17:31:50-04:00
testsuite: mark #20706 tests fragile rather than broken
Whether the static linux linker issues manifest depends on the host
toolchain.
- - - - -
c0b13cbe by Zubin Duggal at 2026-07-27T17:31:50-04:00
testsuite: exclude libnuma from mostly-static
It needs static system libraries (libnuma.a) that many platforms do not
ship.
Fixes #26914
- - - - -
bee1913d by Alan Zimmerman at 2026-07-28T16:42:29-04:00
EPA: ClsInstDecl with decls as [LHsDecl GhcPs] in GhcPs
Similar to 4fdfe75731e01dad7d7fa474c2703d0d3965afb1, this commit
changes the as-parsed representation of class instance declarations to
[LHsDecl GhcPs], and only separates them by type from the renamer onward.
This also allows us to remove all the AnnSortKey machinery for exact
printing, as it is now no longer needed.
- - - - -
72c55eee by Cheng Shao at 2026-07-28T16:43:11-04:00
hadrian: implement and use writeFileAtomic to fix race condition
This patch implements `writeFileAtomic` in hadrian and change all
invocations of shake non-atomic `writeFile'` to use `writeFileAtomic`,
to avoid multiple hadrian concurrent invocations overwriting the same
in-tree generated file not in the build root directory. Fixes #27536.
Additional notes:
- `writeFileChanged`/`writeFileChangedBS` cannot be made atomic since
it involves reading the file's older version, so their uses are left
alone. It doesn't affect #27536 given their outputs are contained in
the build root directory.
- It's possible to shrink this patch by only making writes outside the
build root directory atomic. But I think it's not worth the effort
for fine grained distinction here, and atomic writes within the
build root directory should also improve robustness of a hadrian
build.
- In the longer term we do want to make a ghc build only generate
files within the build root directory, though that's a lot of work
and outside the scope of this particular bugfix.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
46d4f963 by Sylvain Henry at 2026-07-29T06:38:40-04:00
RTS: correctly mark slop bytes when shrinking large arrays (#19048)
Correctly mark slop bytes even when profiling is off so that heap census
doesn't traverse garbage-collected closures.
- - - - -
4762a8bf by Simon Jakobi at 2026-07-29T06:39:23-04:00
Add -XLazyFieldAnnotations (GHC proposal 752)
Unbundle the prefix `~` lazy field annotation syntax from StrictData. The
new LazyFieldAnnotations extension controls whether `~` is accepted on
constructor fields. StrictData (and Strict, transitively) imply the new
extension.
See https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0752-l….
Closes #24455.
Assisted-by: Claude Opus 4.8
- - - - -
0b6dcc84 by Simon Jakobi at 2026-07-29T06:40:04-04:00
testsuite: Relax T24471 residency tolerance
T24471 peak residency fluctuates enough on i386 to cause spurious
failures. Use the standard residency tolerance while retaining the
existing allocation threshold.
See https://gitlab.haskell.org/ghc/ghc/-/work_items/24471#note_682303.
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
90e95b34 by Cheng Shao at 2026-07-29T06:40:45-04:00
compiler: fix missing top-level procedure labels in cmm dumps
This patch fixes missing top-level procedure labels in some
intermediate Cmm pass dumps. Fixes #27553.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
360a5946 by sheaf at 2026-07-29T06:41:35-04:00
Add some type-family-heavy performance tests
FamAppCachePerf stress-tests the performance of lookups in the
type family application cache.
T27336 is a minimisation extracted from the reported reproducer.
SimplCastPerf is a measure of coercion growth due to the simplifier
calling mkTransCo without re-optimising the result.
- - - - -
3ec9e2b9 by Mike Pilgrem at 2026-07-31T08:21:33-04:00
GHC Guide: Improve docs on response files
- - - - -
e5b2a1f7 by sheaf at 2026-07-31T08:22:23-04:00
Disable Core Lint for TcPlugin_RewritePerf
This is a compiler performance test, but the test source hard-coded
-dcore-lint, defeating the measurement.
-------------------------
Metric Decrease:
TcPlugin_RewritePerf
-------------------------
- - - - -
85b10c00 by Alan Zimmerman at 2026-07-31T22:09:47+01:00
EPA: Remove LocatedP from OverlapMode
We have
type LocatedP = GenLocated SrcSpanAnnP
type SrcSpanAnnP = EpAnn AnnPragma
As the first step in removing this in favour of LocatedA which only
captures location, comments and trailing annotations, we remove it
from OverlapMode
We do this by moving the AnnPragma into the TTG extension point
instead.
- - - - -
c9a34a00 by Viktor Dukhovni at 2026-08-02T04:34:17-04:00
Fix note typo
- - - - -
4f2a21f7 by Andreas Klebinger at 2026-08-02T22:46:46-04:00
Apply oneShot Monad trick to STG LintM
- - - - -
21e4b89d by Andreas Klebinger at 2026-08-02T22:46:46-04:00
stgLint: Use a single reader env for read only arguments.
- - - - -
d415f38a by Alan Zimmerman at 2026-08-02T22:47:27-04:00
EPA: Remove LocatedP from CType
The next step of removing use of LocatedP by moving
the AnnPragma for CType into its TTG extension point
instead.
- - - - -
8fc6f882 by Simon Jakobi at 2026-08-05T14:53:41-04:00
testsuite: Don't crash on non-UTF-8 test output
read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded
strictly (the first three with UTF-8, read_diff with the locale
encoding), so a test emitting invalid UTF-8 (binary output, or a crash
truncating a multi-byte character) raised UnicodeDecodeError and was
reported as a framework failure instead of its actual result.
Decode with errors='replace', like read_no_crs and safe_print.
Assisted-by: Claude Fable 5
- - - - -
56534866 by Simon Jakobi at 2026-08-05T14:53:41-04:00
testsuite: Colorize the test summary, also in CI
The summary headings were plain, and SUMMARY was colored unconditionally,
so the escapes also ended up in the file written by --summary-file.
Color is now decided per output sink via term_color.colored_if; see the
comments in term_color.
CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so
add --force-colors and pass it in .gitlab/ci.sh.
Assisted-by: Claude Opus 5
- - - - -
bceb541a by Simon Jakobi at 2026-08-05T14:53:42-04:00
testsuite: Repeat unexpected failure output in the summary
Finding out why a test failed meant scrolling back through a possibly
very long log to the point where the test ran. The summary now repeats
the captured output of unexpected failures, before the statistics, so
the most interesting part is at the end of the log (#16720).
Output mismatches report their diff instead of the mismatching stream
(see Note [Redundant output in test results]). The repeated output is
bounded per stream, and skipped altogether beyond
MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in
several ways share one block.
Test results now report a source-relative directory, stable regardless
of where the run was started from.
Assisted-by: Claude Fable 5
- - - - -
2ab02c57 by Ben Gamari at 2026-08-05T14:54:24-04:00
base: Don't drop exception context in SomeException(toException)
For reasons that are lost to time, the implementation of [CLC #200]
that was merged inappropriately dropped `ExceptionContext` in the
`toException` implementation given to `SomeException`.
Fix this infelicity.
[CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200
- - - - -
126ce574 by Vladislav Zavialov at 2026-08-05T14:55:05-04:00
Test case for #20902
Starting with GHC 9.14.1 (the first major release to include 51e3ec83),
and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68
and b30f25591e), all examples in this ticket are handled as expected.
- - - - -
b14d8d59 by Alan Zimmerman at 2026-08-05T14:55:46-04:00
EPA: Remove LocatedP, last use in WarningTxt
The last step of removing LocatedP, by moving the AnnPragma for
WarningTxt into its TTG extension point instead.
This also allows us to remove LocatedP and SrcSpanAnnP
- - - - -
70b58c8f by Vladislav Zavialov at 2026-08-05T14:56:27-04:00
Test cases for #18725
Starting with GHC 9.4 (the first release to include 268efcc9a4), the program in
this ticket no longer panics. A standalone kind signature breaks the recursive
loop, so the type constructor can be used in a kind within its own group.
T18725a checks that this is accepted with the signature present, while T18725b
confirms it is still rejected without it.
- - - - -
b18c8dd5 by Zubin Duggal at 2026-08-06T15:51:01-04:00
hie files: Dump the type table when dumping with -ddump-hie
- - - - -
f839d0fb by Zubin Duggal at 2026-08-06T15:51:01-04:00
hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast
Fixes #25709
- - - - -
5753ebaa by Simon Jakobi at 2026-08-06T15:51:43-04:00
testsuite: fix stale paths for the ghc-config build artifacts
ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in
6c7a49139c, but the .gitignore entry and the clean rule still referred to
the old location. As a result the compiled ghc-config binary, which
boilerplate.mk rebuilds on every make-driven test run, showed up as an
untracked file and was never cleaned.
Assisted-by: Claude Opus 5
- - - - -
246d4d72 by Simon Peyton Jones at 2026-08-06T15:52:25-04:00
Documentation only
...driven by my investigation of #27591
- - - - -
be69e9df by Alan Zimmerman at 2026-08-06T15:53:05-04:00
EPA: Replace AnnPragma with individual types
We introduced AnnPragma as a common type for all pragma usages wrapped
in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma
moved into the TTG points for the given items, we can ensure that each
carries only the annotations it needs.
So we remove AnnPragma, and in its place bring in
AnnCType
AnnWarningTxt
AnnOverlap
AnnAnnDecl
AnnPragSCC
- - - - -
0779e12c by Simon Jakobi at 2026-08-07T12:36:11-04:00
Cmm: print unreachable blocks under -dppr-debug (#27368)
Unreachable blocks linger in a CmmGraph's block map for most of the Cmm
pipeline, but pprCmmGraph only ever printed the blocks reachable from the
entry, so dumps looked consistent while the graph was not. Issues like
#27368 were hard to debug due to this.
pprCmmGraph now appends the stored-but-unreachable blocks under a
"// unreachable blocks:" heading when -dppr-debug is on.
See Note [unreachable blocks] in GHC.Cmm.Pipeline.
Assisted-by: Claude Opus 5
- - - - -
3a0f9a51 by Simon Peyton Jones at 2026-08-07T12:36:54-04:00
Fix three bugs related to required type args and INLINE pragmas
* `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front,
leading to a Lint error (#27557)
* The arity in an InlineSaturation is the VisArity not the Arity; the
two can differ when we have "required" type arguments. This made the
INLINE pragma argument counting go wrong in `makeCorePair` (#27590).
* When a simple binding has a type signature, we take special path in `tcPolyCheck`,
leading to an outer `AbsBinds` that has no dictionaries, even when the binding
is in fact overloaded. That confused the inline-arity computation in
`makeCorePair` (#27589).
The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`.
That actually simplifies the API of `makeCorePair`, which is nice.
The first bug is fixed by swapping the visiblity flags in
`GHC.Core.Opt.Arity.mkEtaForAllMCo`
Getting the INLINE behaviour right led to some perf changes:
* Runtime /halved/ on T7954 due to better specialisation
* Compile time increased by 6% in T21839c because a bit more inlining
happened, as it always should have done.
* For some reason compile-time max-bytes-used dropped by 30% on
T27336, but only on one build configuration; and it increased
on LinkableUsage02 by 6% on another configuration
Geometric mean effect on our compile time benchmarks is +0.1%.
Metric Decrease:
T27336
T7954
Metric Increase:
LinkableUsage02
T21839c
- - - - -
4f985108 by Vladislav Zavialov at 2026-08-07T17:49:50-04:00
Discard type arguments in tcPatToExpr (#27440, #27583)
The builder expression of an implicitly bidirectional pattern synonym must not
mention types written in the RHS:
* Invisible type arguments led to a panic (#27440)
* Required type arguments failed with out-of-scope variables (#27583)
Both are now discarded, following the precedent established by pattern
signatures (#9867).
Discarding type arguments takes some care: a type pattern cannot be told from a
value pattern by syntax alone, as the `type` keyword may be omitted. Consider:
data T a b c where
MkT :: forall a. forall b c -> a -> T a b c
pattern P :: x -> T x y z
pattern P x = MkT @a (type b) c x
In P's right-hand side, `@a` and `type b` are clearly type arguments, but what
about `c` and `x`? We can only tell by matching the patterns against MkT's
type. So tcPatToExpr now runs in TcM and matches the arguments against the
constructor's TyVarBinders using zipPatsBndrs, which is made public for this
purpose. The resulting builder is $bP x = MkT _ _ x.
See Note [Discarding types in the builder expression].
Test cases: T27440a T27440b T27440c T27440d T27440e
T27583a T27583b T27583c T27583d T27583e T27583f T27583g
Metric Increase: LinkableUsage02
Metric Decrease: T27336
Assisted-by: Claude Opus 5
- - - - -
eb1dcd4d by sheaf at 2026-08-07T17:50:40-04:00
mkWpFun_FRR: fix ordering of coercion composition
When the subsumption machinery generates an eta-expansion, we must
perform a representation polymorphism check to ensure the lambda binder
it introduces has a fixed runtime representation.
This is done in GHC.Tc.Utils.mkWpFun_FRR.
This check involves composing quite a few coercions, arising from
representation-polymorphism checks on both the actual and expected
argument types. These coercions are then chained using HsWrapper
composition, <.>. The ordering of composition was incorrect, leading to
the Core Lint failure reported in #27639. This commit fixes that.
Fixes #27639
- - - - -
26462aca by Alan Zimmerman at 2026-08-09T10:37:18+01:00
GHC-CPP: Initial implementation
Processes
#define FOO
#ifdef FOO
x = 1
#endif
Into
[ITcppIgnored [L loc ITcppDefine]
,ITcppIgnored [L loc ITcppIfdef]
,ITvarid "x"
,ITequal
,ITinteger (IL {il_text = SourceText "1", il_neg = False, il_value = 1})
,ITcppIgnored [L loc ITcppEndif]
,ITeof]
In time, ITcppIgnored will be pushed into a comment
Tidy up before re-visiting the continuation mechanic
Switch preprocessor to continuation passing style
Proof of concept, needs tidying up
Small cleanup
Get rid of some cruft
Summary: Patch:
Author: Alan Zimmerman <alan.zimm(a)gmail.com>
Date: 2025-10-12 16:23:56 +0100
Summary: Patch: rebase-and-tests-pass
Author: Alan Zimmerman <alan.zimm(a)gmail.com>
Date: 2025-10-12 14:19:04 +0100
Rebase, and all tests pass except whitespace for generated parser
Starting to integrate.
Need to get the pragma recognised and set
Make cppTokens extend to end of line, and process CPP comments
Remove unused ITcppDefined
Allow spaces between # and keyword for preprocessor directive
Process CPP continuation lines
They are emited as separate ITcppContinue tokens.
Perhaps the processing should be more like a comment, and keep on
going to the end.
BUT, the last line needs to be slurped as a whole.
Accumulate CPP continuations, process when ready
Can be simplified further, we only need one CPP token
Simplify Lexer interface. Only ITcpp
We transfer directive lines through it, then parse them from scratch
in the preprocessor.
Deal with directive on last line, with no trailing \n
Start parsing and processing the directives
Prepare for processing include files
Move PpState into PreProcess
And initParserState, initPragState too
Process nested include files
Also move PpState out of Lexer.x, so it is easy to evolve it in a ghci
session, loading utils/check-cpp/Main.hs
Split into separate files
Starting on expression parser.
But it hangs. Time for Text.Parsec.Expr
Start integrating the ghc-cpp work
From https://github.com/alanz/ghc-cpp
WIP
Fixup after rebase
WIP
Fixup after rebase, including all tests pass
Change pragma usage to GHC_CPP from GhcCPP
Some comments
Reformat
Delete unused file
Rename module Parse to ParsePP
Clarify naming in the parser
WIP. Switching to alex/happy to be able to work in-tree
Since Parsec is not available
Layering is now correct
- GHC lexer, emits CPP tokens
- accumulated in Preprocessor state
- Lexed by CPP lexer, CPP command extracted, tokens concated with
spaces (to get rid of token pasting via comments)
- if directive lexed and parsed by CPP lexer/parser, and evaluated
First example working
Loading Example1.hs into ghci, getting the right results
```
{-# LANGUAGE GHC_CPP #-}
module Example1 where
y = 3
x =
"hello"
"bye now"
foo = putStrLn x
```
Rebase, and all tests pass except whitespace for generated parser
info: patch template saved to `-`
More plumbing. Ready for testing tomorrow.
Proress. Renamed module State from Types
And at first blush it seems to handle preprocessor scopes properly.
Insert basic GHC version macros into parser
__GLASGOW_HASKELL__
__GLASGOW_HASKELL_FULL_VERSION__
__GLASGOW_HASKELL_PATCHLEVEL1__
__GLASGOW_HASKELL_PATCHLEVEL2__
Re-sync check-cpp for easy ghci work
Get rid of warnings
Rework macro processing, in check-cpp
Macros kept at the top level, looked up via name, multiple arity
versions per name can be stored
WIP. Can crack arguments for #define
Next step it to crack out args in an expansion
WIP on arg parsing.
Progress. Still screwing up nested parens.
Seems to work, but has redundant code
Remove redundant code
Reformat
Expand args, single pass
Still need to repeat until fixpoint
Fixed point expansion
Sync the playground to compiler
Working on dumping the GHC_CPP result
But We need to keep the BufSpan in a comment
Keep BufSpan in queued comments in GHC.Parser.Lexer
Getting close to being able to print the combined tokens
showing what is in and what is out
First implementation of dumpGhcCpp.
Example output
First dumps all macros in the state, then the source, showing which
lines are in and which are out
------------------------------
- |#define FOO(A,B) A + B
- |#define FOO(A,B,C) A + B + C
- |#if FOO(1,FOO(3,4)) == 8
- |-- a comment
|x = 1
- |#else
- |x = 5
- |#endif
Clean up a bit
Add -ddump-ghc-cpp option and a test based on it
Restore Lexer.x rules, we need them for continuation lines
Lexer.x: trying to sort out the span for continuations
- We need to match on \n at the end of the line
- We cannot simply back up for it
Inserts predefined macros. But does not dump properly
Because the cpp tokens have a trailing newline
Remove unnecessary LExer rules
We *need* the ones that explicitly match to the end of the line.
Generate correct span for ITcpp
Dump now works, except we do not render trailing `\` for continuation
lines. This is good enough for use in test output.
Reduce duplication in lexer
Tweaks
Insert min_version predefined macros into state
The mechanism now works. Still need to flesh out the full set.
Trying my alternative pragma syntax.
It works, but dumpGhcCpp is broken, I suspect from the ITcpp token
span update.
Pragma extraction now works, with both CPP and GHC_CPP
For the following
{-# LANGUAGE CPP #-}
#if __GLASGOW_HASKELL__ >= 913
{-# LANGUAGE GHC_CPP #-}
#endif
We will enable GHC_CPP only
Remove some tracing
Fix test exes for changes
For GHC_CPP tests, normalise config-time-based macros
WIP
WIP again. What is wrong?
Revert to dynflags for normal not pragma lexing
Working on getting check-exact to work properly
Passes CppCommentPlacement test
Starting on exact printing with GHC_CPP
While overriding normal CPP
Correctly store CPP ignored tokens as comments
By populating the lexeme string in it, based on the bufpos
WIP
Simplifying
Update the active state logic
Work the new logic into the mainline code
Process `defined` operator
Manage lexer state while skipping tokens
There is very intricate layout-related state used when lexing. If a
CPP directive blanks out some tokens, store this state when the
blanking starts, and restore it when they are no longer being blanked.
Track the last token buffer index, for ITCppIgnored
We need to attach the source being skipped in an ITCppIgnored token.
We cannot simply use its BufSpan as an index into the underlying
StringBuffer as it counts unicode chars, not bytes.
So we update the lexer state to store the starting StringBuffer
location for the last token, and use the already-stored length to
extract the correct portion of the StringBuffer being parsed.
Process the ! operator in GHC_CPP expressions
Predefine a constant when GHC_CPP is being used.
WIP
Skip lines directly in the lexer when required
Properly manage location when accepting tokens again
Seems to be working now, for Example9
Remove tracing
Fix parsing '*' in block comments
Instead of replacing them with '-'
Keep the trailing backslash in a ITcpp token
Deal with only enabling one section of a group.
A group is an instance of a conditional introduced by
#if/#ifdef/#ifndef,
and ending at the final #endif, including intermediate #elsif sections
Replace remaining identifiers with 0 when evaluating
As per the spec
Snapshot before rebase
Skip non-processed lines starting with #
Export generateMacros so we can use it in ghc-exactprint
Fix rebase
Expose initParserStateWithMacrosString
Fix buggy lexer cppSkip
It was skipping all lines, not just ones prefixed by #
Fix evaluation of && to use the correct operator
Deal with closing #-} at the start of a line
Add the MIN_VERSION_GLASGOW_HASKELL predefined macro
Include MIN_VERSION_GLASGOW_HASKELL in GhcCpp01.stderr
Use a strict map for macro defines
Process TIdentifierLParen
Which only matters at the start of #define
Do not provide TIdentifierLParen paren twice
Handle whitespace between identifier and '(' for directive only
Expose some Lexer bitmap manipulation helpers
Deal with line pragmas as tokens
Blows up for dumpGhcCpp though
Allow strings delimited by a single quote too
Allow leading whitespace on cpp directives
As per https://timsong-cpp.github.io/cppwp/n4140/cpp#1
Implement GHC_CPP undef
Sort out expansion of no-arg macros, in a context with args
And make the expansion bottom out, in the case of recursion
Fix GhcCpp01 test
The LINE pragma stuff works in ghc-exactprint when specifically
setting flag to emit ITline_pragma tokens
Process comments in CPP directives
Correctly lex pragmas with finel #-} on a newline
Do not process CPP-style comments
Allow cpp-style comments when GHC_CPP enabled
Return other pragmas as cpp ignored when GHC_CPP active
Reorganise getOptionsFromFile for use in ghc-exactprint
We want to be able to inject predefined macro definitions into the
parser preprocessor state for when we do a hackage roundtrip.
Tweak testing
Only allow unknown cpp pragmas with # in left margin
Require # against left margin for all GHC_CPP directives
Fix CPP directives appearing in pragmas
And add a test for error reporting for missing `#if`
Starting to report GHC_CPP errors using GHC machinery
More GHC_CPP diagnostic results
WIP on converting error calls to GHC diagnostics in GHC_CPP
Working on CPP diagnostic reporting
Tweak some tests/lint warnings
More error reporting in Macro
Some cleanups
Some cleanup
GHC_CPP: Working on improving error reporting
Harvest some commonality
Use PPM as Maybe inside PP
Clean up a bit
Fix GhcCpp01 test
I think this needs to be made more robust. Likely by not dumping the
(pre-)defined macros.
info: patch template saved to `-`
info: patch template saved to `-`
- - - - -
a5391d10 by Alan Zimmerman at 2026-08-09T10:37:18+01:00
GHC_CPP: delete utils/check-cpp
It is not needed
- - - - -
af10f1ff by Alan Zimmerman at 2026-08-09T10:37:18+01:00
GHC_CPP: remove #include processing
We do not support it
- - - - -
f7699709 by Alan Zimmerman at 2026-08-09T10:37:18+01:00
GHC_CPP: move Eval.hs into GHC.Parser.PreProcess.Macro
- - - - -
3177 changed files:
- .gitignore
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/darwin/nix/sources.json
- .gitlab/darwin/toolchain.nix
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- .gitlab/generate-ci/flake.lock
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/issue_templates/default.md
- + .gitlab/issue_templates/get-verified.md
- + .gitlab/issue_templates/release_tracking.md
- .gitlab/jobs.yaml
- .gitlab/merge_request_templates/Default.md
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- .gitlab/test-metrics.sh
- .gitmodules
- CODEOWNERS
- boot
- cabal.project-reinstall
- + changelog.d/21101
- + changelog.d/26616
- + changelog.d/27380
- + changelog.d/27532
- + changelog.d/AbstractQ
- + changelog.d/T15973
- + changelog.d/T17833
- + changelog.d/T19174.md
- + changelog.d/T21176
- + changelog.d/T21628
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- + changelog.d/T26423
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- + changelog.d/T27317
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- + changelog.d/T27359
- + changelog.d/T27360
- + changelog.d/T27368-ppr-unreachable-cmm-blocks.md
- + changelog.d/T27374
- + changelog.d/T27386
- + changelog.d/T27440
- + changelog.d/T27455
- + changelog.d/T27456
- + changelog.d/T27557
- + changelog.d/T27583
- + changelog.d/T27589
- + changelog.d/T27639
- + changelog.d/add_can_drop_to_occurence_analyser
- + changelog.d/binary-array-no-list
- + changelog.d/bump-process
- + changelog.d/bytecode-interpreter-hpc-support
- + changelog.d/changelog-entries
- + changelog.d/cmm-import-syntax-changes
- + changelog.d/config
- + changelog.d/deterministic-usage-order
- + changelog.d/dynamic-trace-flags
- + changelog.d/elem-via-foldr-27096
- + changelog.d/fix-absent-dict-projection
- + changelog.d/fix-blackhole-handling
- + changelog.d/fix-cmm-atomic-load-store
- + changelog.d/fix-cmm-dump-labels
- + changelog.d/fix-compacting-gc-ap-27434
- + changelog.d/fix-duplicate-pmc-warnings
- + changelog.d/fix-exponential-case-desugar-27383
- + changelog.d/fix-finalizers-27072
- + changelog.d/fix-ghci-duplicate-warnings-26233
- + changelog.d/fix-heap-census-large-arrays-19048
- + changelog.d/fix-layout-stack-fcall
- + changelog.d/fix-make-install-j
- + changelog.d/fix-peekitbl-no-tntc
- + changelog.d/fix-plugin-finder-multi-home-unit.md
- + changelog.d/fix-unreg
- + changelog.d/fix-use-std-ap-thunk
- + changelog.d/generically-mconcat
- + changelog.d/ghc-api-epa-parens
- + changelog.d/ghc-api-holes-ast-27111
- + changelog.d/ghc-api-namespace-specifier-26678
- + changelog.d/ghc-pkg-faster-closure
- + changelog.d/ghc-pkg-long-path-support
- + changelog.d/hadrian-response-files.md
- + changelog.d/hadrian-stale-package-confs-26661
- + changelog.d/hadrian-system-cxx-std-lib-25303
- + changelog.d/hadrian-warn-missing-package-index-16484
- + changelog.d/inter-module-far-jumps-aarch64-default
- + changelog.d/interactive-error-hints
- + changelog.d/ipe-event-class
- + changelog.d/jobserver-leak-fix
- + changelog.d/lazy-field-annotations
- + changelog.d/lib-add-tuple-tyfam-27179
- + changelog.d/libdir-setting
- + changelog.d/llvm-22
- + changelog.d/module-graph-reuse-in-downsweep
- + changelog.d/more-efficient-home-unit-imports-finding
- + changelog.d/no-more-timer-signal
- + changelog.d/pp-set-ghc-version
- + changelog.d/reexported-module-errors
- + changelog.d/remove-bignum-check-backend
- + changelog.d/remove-bignum-ffi-backend
- + changelog.d/remove-ddump-json-flag
- + changelog.d/rts_symlinks.md
- + changelog.d/semaphore-v2
- + changelog.d/simd_constant_folding
- + changelog.d/skip-test
- + changelog.d/so_inline_is_a_predicate
- + changelog.d/stable-core-dump-order-27296
- + changelog.d/stage2-cross-compilers
- + changelog.d/tag-inference-27005
- + changelog.d/tcplugin_init.md
- + changelog.d/tcplugins-pmc.md
- + changelog.d/tool-messages-27370
- + changelog.d/typecheckModule-API.md
- + changelog.d/unit-index
- + changelog.d/unused-type
- + changelog.d/warn-defaulted-callstack
- + changelog.d/wasm-fix-serviceworker
- + changelog.d/windows-rethrow-overlapped-exception
- + changelog.d/withTcPlugins.md
- compiler/.hlint.yaml
- compiler/CodeGen.Platform.h
- compiler/GHC.hs
- compiler/GHC/Builtin/Names.hs
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- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/Types/Prim.hs
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- + compiler/GHC/ByteCode/Binary.hs
- compiler/GHC/ByteCode/Breakpoints.hs
- compiler/GHC/ByteCode/InfoTable.hs
- compiler/GHC/ByteCode/Instr.hs
- compiler/GHC/ByteCode/Linker.hs
- + compiler/GHC/ByteCode/Recomp/Binary.hs
- compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Cmm.hs
- compiler/GHC/Cmm/CLabel.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/Cmm/Dataflow/Graph.hs
- compiler/GHC/Cmm/Dataflow/Label.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/Info.hs
- compiler/GHC/Cmm/InitFini.hs
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- compiler/GHC/Cmm/Lexer.x
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- compiler/GHC/Cmm/Node.hs
- compiler/GHC/Cmm/Opt.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Parser/Monad.hs
- compiler/GHC/Cmm/Pipeline.hs
- compiler/GHC/Cmm/Type.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/AArch64/Regs.hs
- compiler/GHC/CmmToAsm/BlockLayout.hs
- compiler/GHC/CmmToAsm/CFG.hs
- compiler/GHC/CmmToAsm/Config.hs
- compiler/GHC/CmmToAsm/LA64/CodeGen.hs
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- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
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- compiler/GHC/CmmToAsm/PPC/Regs.hs
- compiler/GHC/CmmToAsm/Ppr.hs
- compiler/GHC/CmmToAsm/RV64/CodeGen.hs
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- compiler/GHC/CmmToAsm/RV64/Ppr.hs
- compiler/GHC/CmmToAsm/RV64/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
- compiler/GHC/CmmToAsm/Reg/Linear.hs
- compiler/GHC/CmmToAsm/Reg/Linear/FreeRegs.hs
- compiler/GHC/CmmToAsm/Reg/Linear/JoinToTargets.hs
- compiler/GHC/CmmToAsm/Reg/Linear/StackMap.hs
- compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
- compiler/GHC/CmmToAsm/Reg/Linear/X86_64.hs
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- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
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- compiler/GHC/CmmToAsm/X86/RegInfo.hs
- compiler/GHC/CmmToAsm/X86/Regs.hs
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- compiler/GHC/CmmToLlvm.hs
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- compiler/GHC/CmmToLlvm/Mangler.hs
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- compiler/GHC/Core/Class.hs
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- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/InstEnv.hs
- compiler/GHC/Core/Lint.hs
- + compiler/GHC/Core/Lint/SubstTypeLets.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
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- compiler/GHC/Core/Opt/FloatIn.hs
- compiler/GHC/Core/Opt/FloatOut.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Pipeline.hs
- + compiler/GHC/Core/Opt/Range.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
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- compiler/GHC/Driver/Hooks.hs
- compiler/GHC/Driver/Main.hs
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- compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot
- + compiler/GHC/Driver/Main/Hsc.hs
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- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- + compiler/GHC/Hs/Decls/Overlap.hs
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- − compiler/GHC/Hs/Doc.hs-boot
- compiler/GHC/Hs/DocString.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Expr.hs-boot
- compiler/GHC/Hs/Extension.hs
- + compiler/GHC/Hs/Extension/Pass.hs
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- compiler/GHC/Hs/Instances.hs
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- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Arrows.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Breakpoints.hs
- + compiler/GHC/HsToCore/Breakpoints/Types.hs
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- compiler/GHC/Parser/PostProcess/Haddock.hs
- + compiler/GHC/Parser/PreProcess.hs
- + compiler/GHC/Parser/PreProcess/Eval.hs
- + compiler/GHC/Parser/PreProcess/Lexer.x
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- + compiler/GHC/Parser/PreProcess/ParsePP.hs
- + compiler/GHC/Parser/PreProcess/Parser.y
- + compiler/GHC/Parser/PreProcess/ParserM.hs
- + compiler/GHC/Parser/PreProcess/State.hs
- compiler/GHC/Parser/String.hs
- compiler/GHC/Parser/Types.hs
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- + compiler/GHC/Platform/Tag.hs
- compiler/GHC/Platform/Ways.hs
- compiler/GHC/Prelude/Basic.hs
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- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/Expr.hs-boot
- compiler/GHC/Rename/Fixity.hs
- compiler/GHC/Rename/HsType.hs
- + compiler/GHC/Rename/Lit.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
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- compiler/GHC/Rename/Unbound.hs
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- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Interpreter/Types/SymbolCache.hs
- compiler/GHC/Runtime/Interpreter/Wasm.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Settings.hs
- compiler/GHC/Settings/Constants.hs
- compiler/GHC/Settings/IO.hs
- compiler/GHC/Stg/Debug.hs
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- compiler/GHC/Stg/EnforceEpt/Rewrite.hs
- compiler/GHC/Stg/EnforceEpt/TagSig.hs
- compiler/GHC/Stg/EnforceEpt/Types.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm.hs
- compiler/GHC/StgToCmm/Bind.hs
- compiler/GHC/StgToCmm/Closure.hs
- compiler/GHC/StgToCmm/Config.hs
- compiler/GHC/StgToCmm/DataCon.hs
- compiler/GHC/StgToCmm/Env.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Heap.hs
- compiler/GHC/StgToCmm/InfoTableProv.hs
- compiler/GHC/StgToCmm/Layout.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToCmm/Prof.hs
- compiler/GHC/StgToCmm/Ticky.hs
- compiler/GHC/StgToCmm/Utils.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Ids.hs
- compiler/GHC/StgToJS/Linker/Utils.hs
- compiler/GHC/StgToJS/Literal.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/GHC/SysTools/Process.hs
- compiler/GHC/SysTools/Tasks.hs
- compiler/GHC/SysTools/Terminal.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Deriv/Infer.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Hole.hs
- compiler/GHC/Tc/Errors/Hole/FitTypes.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Arrow.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/Do.hs
- + compiler/GHC/Tc/Gen/Expand.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Expr.hs-boot
- compiler/GHC/Tc/Gen/Foreign.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Match.hs-boot
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Gen/Splice.hs-boot
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Instance/Typeable.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/Equality.hs
- compiler/GHC/Tc/Solver/FunDeps.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Solver/Rewrite.hs
- compiler/GHC/Tc/Solver/Solve.hs
- compiler/GHC/Tc/Solver/Types.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/TyCl/Class.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/BasicTypes.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/CtLoc.hs
- compiler/GHC/Tc/Types/ErrCtxt.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/LclEnv.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Types/Origin.hs-boot
- compiler/GHC/Tc/Types/Rank.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/Env.hs
- compiler/GHC/Tc/Utils/Instantiate.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- − compiler/GHC/Tc/Utils/TcMType.hs-boot
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/TcType.hs-boot
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Validity.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Arity.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Error.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/FieldLabel.hs
- compiler/GHC/Types/Fixity.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/ForeignStubs.hs
- compiler/GHC/Types/GREInfo.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/HpcInfo.hs
- compiler/GHC/Types/Id.hs
- compiler/GHC/Types/Id/Info.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/InlinePragma.hs
- compiler/GHC/Types/Literal.hs
- + compiler/GHC/Types/Literal/Floating.hs
- compiler/GHC/Types/Name.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Env.hs
- compiler/GHC/Types/Name/Occurrence.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/Name/Set.hs
- compiler/GHC/Types/PkgQual.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/SourceError.hs
- compiler/GHC/Types/SourceText.hs
- compiler/GHC/Types/SrcLoc.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/TyThing.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Types/Unique/FM.hs
- compiler/GHC/Types/Unique/Supply.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Types/Var/Env.hs
- + compiler/GHC/Types/Var/FV.hs
- compiler/GHC/Types/Var/Set.hs
- compiler/GHC/Unit.hs
- compiler/GHC/Unit/Env.hs
- + compiler/GHC/Unit/External/Database.hs
- + compiler/GHC/Unit/External/Index.hs
- + compiler/GHC/Unit/External/ModuleOrigin.hs
- + compiler/GHC/Unit/External/Providers.hs
- + compiler/GHC/Unit/External/Query.hs
- + compiler/GHC/Unit/External/Substitution.hs
- + compiler/GHC/Unit/External/Validate.hs
- + compiler/GHC/Unit/External/Visibility.hs
- + compiler/GHC/Unit/External/Wired.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Finder/Types.hs
- compiler/GHC/Unit/Home/Graph.hs
- compiler/GHC/Unit/Home/ModInfo.hs
- compiler/GHC/Unit/Info.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/Env.hs
- compiler/GHC/Unit/Module/Graph.hs
- compiler/GHC/Unit/Module/Location.hs
- compiler/GHC/Unit/Module/ModGuts.hs
- compiler/GHC/Unit/Module/ModIface.hs
- compiler/GHC/Unit/Module/Status.hs
- compiler/GHC/Unit/Module/Warnings.hs
- compiler/GHC/Unit/Module/WholeCoreBindings.hs
- compiler/GHC/Unit/State.hs
- + compiler/GHC/Unit/State.hs-boot
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/EndoOS.hs
- compiler/GHC/Utils/Error.hs
- − compiler/GHC/Utils/FV.hs
- compiler/GHC/Utils/Logger.hs
- compiler/GHC/Utils/Misc.hs
- compiler/GHC/Utils/Monad.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/GHC/Utils/Trace.hs
- compiler/GHC/Wasm/ControlFlow/FromCmm.hs
- compiler/Language/Haskell/Syntax.hs
- compiler/Language/Haskell/Syntax/Basic.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- compiler/Language/Haskell/Syntax/Binds/InlinePragma.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- + compiler/Language/Haskell/Syntax/Decls/Foreign.hs
- + compiler/Language/Haskell/Syntax/Decls/Overlap.hs
- + compiler/Language/Haskell/Syntax/Doc.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Expr.hs-boot
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/ImpExp.hs
- compiler/Language/Haskell/Syntax/Lit.hs
- compiler/Language/Haskell/Syntax/Module/Name.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Specificity.hs
- + compiler/Language/Haskell/Syntax/Text.hs
- compiler/Language/Haskell/Syntax/Type.hs
- − compiler/Language/Haskell/Syntax/Type.hs-boot
- compiler/ghc.cabal.in
- config.guess
- config.sub
- configure.ac
- distrib/configure.ac.in
- − docs/Makefile
- − docs/storage-mgt/Makefile
- + docs/users_guide/10.2.1-notes.rst
- − docs/users_guide/9.16.1-notes.rst
- − docs/users_guide/Makefile
- docs/users_guide/bugs.rst
- docs/users_guide/conf.py
- docs/users_guide/debug-info.rst
- docs/users_guide/debugging.rst
- docs/users_guide/eventlog-formats.rst
- docs/users_guide/expected-undocumented-flags.txt
- docs/users_guide/extending_ghc.rst
- docs/users_guide/exts/control.rst
- docs/users_guide/exts/explicit_namespaces.rst
- docs/users_guide/exts/linear_types.rst
- + docs/users_guide/exts/modifiers.rst
- docs/users_guide/exts/multiway_if.rst
- docs/users_guide/exts/pragmas.rst
- + docs/users_guide/exts/qualified_strings.rst
- docs/users_guide/exts/rank_polymorphism.rst
- docs/users_guide/exts/recursive_do.rst
- docs/users_guide/exts/required_type_arguments.rst
- docs/users_guide/exts/rewrite_rules.rst
- docs/users_guide/exts/roles.rst
- docs/users_guide/exts/static_pointers.rst
- docs/users_guide/exts/stolen_syntax.rst
- docs/users_guide/exts/strict.rst
- docs/users_guide/exts/syntax.rst
- docs/users_guide/exts/table.rst
- docs/users_guide/exts/template_haskell.rst
- docs/users_guide/ghc_config.py.in
- − docs/users_guide/ghc_packages.py
- docs/users_guide/ghci.rst
- docs/users_guide/index.rst
- docs/users_guide/javascript.rst
- docs/users_guide/packages.rst
- docs/users_guide/phases.rst
- docs/users_guide/profiling.rst
- docs/users_guide/release-notes.rst
- docs/users_guide/rtd-theme/layout.html
- docs/users_guide/runtime_control.rst
- docs/users_guide/using-concurrent.rst
- docs/users_guide/using-optimisation.rst
- docs/users_guide/using-warnings.rst
- docs/users_guide/using.rst
- docs/users_guide/utils.py
- docs/users_guide/wasm.rst
- docs/users_guide/win32-dlls.rst
- − driver/Makefile
- − driver/ghc/Makefile
- − driver/ghci/Makefile
- driver/ghci/ghci.c
- − driver/haddock/Makefile
- driver/utils/cwrapper.c
- driver/utils/isMinTTY.c
- − driver/utils/merge_sections.ld
- − driver/utils/merge_sections_pe.ld
- ghc/GHC/Driver/Session/Mode.hs
- ghc/GHCi/Leak.hs
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Exception.hs
- ghc/GHCi/UI/Info.hs
- ghc/Main.hs
- − ghc/Makefile
- ghc/ghc-bin.cabal.in
- hadrian/README.md
- hadrian/bindist/Makefile
- hadrian/bindist/config.mk.in
- hadrian/bindist/cwrappers/cwrapper.c
- hadrian/bootstrap/generate_bootstrap_plans
- hadrian/bootstrap/plan-9_10_1.json
- hadrian/bootstrap/plan-9_10_2.json
- + hadrian/bootstrap/plan-9_10_3.json
- hadrian/bootstrap/plan-9_12_1.json
- hadrian/bootstrap/plan-9_12_2.json
- + hadrian/bootstrap/plan-9_14_1.json
- hadrian/bootstrap/plan-bootstrap-9_10_1.json
- hadrian/bootstrap/plan-bootstrap-9_10_2.json
- + hadrian/bootstrap/plan-bootstrap-9_10_3.json
- hadrian/bootstrap/plan-bootstrap-9_12_1.json
- hadrian/bootstrap/plan-bootstrap-9_12_2.json
- + hadrian/bootstrap/plan-bootstrap-9_14_1.json
- hadrian/build-cabal
- hadrian/build-cabal.bat
- hadrian/cabal.project
- hadrian/cfg/default.host.target.in
- hadrian/cfg/default.target.in
- + hadrian/cfg/system.config.host.in
- hadrian/cfg/system.config.in
- + hadrian/cfg/system.config.target.in
- hadrian/doc/flavours.md
- hadrian/doc/make.md
- hadrian/doc/testsuite.md
- hadrian/doc/user-settings.md
- hadrian/hadrian.cabal
- hadrian/src/Base.hs
- + hadrian/src/BindistConfig.hs
- hadrian/src/Builder.hs
- hadrian/src/CommandLine.hs
- hadrian/src/Context.hs
- hadrian/src/Expression.hs
- hadrian/src/Flavour.hs
- hadrian/src/Flavour/Type.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Builder/Ar.hs
- hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
- hadrian/src/Hadrian/Haskell/Cabal/Type.hs
- hadrian/src/Hadrian/Haskell/Hash.hs
- hadrian/src/Hadrian/Oracles/Path.hs
- hadrian/src/Hadrian/Oracles/TextFile.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Main.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Oracles/Flavour.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Oracles/TestSettings.hs
- hadrian/src/Packages.hs
- hadrian/src/Rules.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/CabalReinstall.hs
- + hadrian/src/Rules/Changelog.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Docspec.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Gmp.hs
- − hadrian/src/Rules/Libffi.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Lint.hs
- hadrian/src/Rules/Nofib.hs
- hadrian/src/Rules/Program.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Rules/SourceDist.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Rules/ToolArgs.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cabal.hs
- hadrian/src/Settings/Builders/Cc.hs
- hadrian/src/Settings/Builders/Common.hs
- hadrian/src/Settings/Builders/Configure.hs
- hadrian/src/Settings/Builders/DeriveConstants.hs
- hadrian/src/Settings/Builders/GenPrimopCode.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/Hsc2Hs.hs
- hadrian/src/Settings/Builders/Make.hs
- − hadrian/src/Settings/Builders/MergeObjects.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Builders/SplitSections.hs
- hadrian/src/Settings/Default.hs
- − hadrian/src/Settings/Flavours/Benchmark.hs
- hadrian/src/Settings/Flavours/Development.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Performance.hs
- hadrian/src/Settings/Flavours/Quick.hs
- hadrian/src/Settings/Flavours/QuickCross.hs
- hadrian/src/Settings/Flavours/Quickest.hs
- hadrian/src/Settings/Flavours/Validate.hs
- hadrian/src/Settings/Packages.hs
- hadrian/src/Settings/Program.hs
- hadrian/src/Settings/Warnings.hs
- hadrian/stack.yaml
- − libffi-tarballs
- libraries/Cabal
- − libraries/Makefile
- libraries/array
- libraries/base/base.cabal.in
- libraries/base/changelog.md
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Arrow.hs
- libraries/base/src/Control/Concurrent.hs
- libraries/base/src/Control/Exception.hs
- libraries/base/src/Control/Monad.hs
- libraries/base/src/Control/Monad/IO/Class.hs
- libraries/base/src/Data/Array/Byte.hs
- libraries/base/src/Data/Bifoldable1.hs
- libraries/base/src/Data/Bool.hs
- libraries/base/src/Data/Char.hs
- libraries/base/src/Data/Data.hs
- + libraries/base/src/Data/Double.hs
- libraries/base/src/Data/Eq.hs
- libraries/base/src/Data/Fixed.hs
- + libraries/base/src/Data/Float.hs
- libraries/base/src/Data/Functor/Classes.hs
- libraries/base/src/Data/Functor/Compose.hs
- libraries/base/src/Data/Ix.hs
- libraries/base/src/Data/List.hs
- libraries/base/src/Data/List/NonEmpty.hs
- libraries/base/src/Data/List/NubOrdSet.hs
- libraries/base/src/Data/Semigroup.hs
- libraries/base/src/Data/Version.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/ByteOrder.hs
- libraries/base/src/GHC/Conc.hs
- libraries/base/src/GHC/Conc/Sync.hs
- − libraries/base/src/GHC/Desugar.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- libraries/base/src/GHC/IO/Handle.hs
- − libraries/base/src/GHC/JS/Prim/Internal/Build.hs
- libraries/base/src/GHC/Num.hs
- − libraries/base/src/GHC/Num/BigNat.hs
- − libraries/base/src/GHC/Num/Integer.hs
- − libraries/base/src/GHC/Num/Natural.hs
- libraries/base/src/GHC/RTS/Flags.hs
- libraries/base/src/GHC/ResponseFile.hs
- libraries/base/src/GHC/Stack.hs
- libraries/base/src/GHC/Stats.hs
- libraries/base/src/GHC/Unicode.hs
- libraries/base/src/GHC/Weak.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- libraries/base/src/Numeric.hs
- libraries/base/src/Prelude.hs
- libraries/base/src/System/CPUTime/Utils.hs
- libraries/base/src/System/Environment.hs
- libraries/base/src/System/Exit.hs
- libraries/base/src/System/IO.hs
- + libraries/base/src/System/IO/OS.hs
- libraries/base/src/System/Info.hs
- libraries/base/src/System/Mem/Weak.hs
- libraries/base/src/System/Timeout.hs
- libraries/base/src/Text/Printf.hs
- libraries/base/src/Text/Read.hs
- libraries/base/tests/IO/T12010/cbits/initWinSock.c
- libraries/base/tests/IO/T17912.hs
- libraries/base/tests/IO/T18832.hs
- libraries/base/tests/IO/all.T
- + libraries/base/tests/IO/osHandles001FileDescriptors.hs
- + libraries/base/tests/IO/osHandles001FileDescriptors.stdout
- + libraries/base/tests/IO/osHandles001WindowsHandles.hs
- + libraries/base/tests/IO/osHandles001WindowsHandles.stdout
- + libraries/base/tests/IO/osHandles002FileDescriptors.hs
- + libraries/base/tests/IO/osHandles002FileDescriptors.stderr
- + libraries/base/tests/IO/osHandles002FileDescriptors.stdin
- + libraries/base/tests/IO/osHandles002FileDescriptors.stdout
- + libraries/base/tests/IO/osHandles002WindowsHandles.hs
- + libraries/base/tests/IO/osHandles002WindowsHandles.stderr
- + libraries/base/tests/IO/osHandles002WindowsHandles.stdin
- + libraries/base/tests/IO/osHandles002WindowsHandles.stdout
- libraries/base/tests/T15349.stderr
- libraries/base/tests/T23454.stderr
- libraries/base/tests/all.T
- libraries/base/tests/enum01.stdout
- libraries/base/tests/enum01.stdout-alpha-dec-osf3
- libraries/base/tests/enum01.stdout-ws-64
- + libraries/base/tests/perf/ElemFusionUnknownList.hs
- + libraries/base/tests/perf/ElemFusionUnknownList_O1.stderr
- + libraries/base/tests/perf/ElemFusionUnknownList_O2.stderr
- + libraries/base/tests/perf/ElemNoFusion.hs
- + libraries/base/tests/perf/ElemNoFusion_O1.stderr
- + libraries/base/tests/perf/ElemNoFusion_O2.stderr
- libraries/base/tests/perf/T17752.hs
- − libraries/base/tests/perf/T17752.stdout
- + libraries/base/tests/perf/T17752_O1.stderr
- + libraries/base/tests/perf/T17752_O2.stderr
- libraries/base/tests/perf/all.T
- libraries/deepseq
- libraries/directory
- libraries/exceptions
- libraries/file-io
- libraries/filepath
- libraries/ghc-bignum/changelog.md
- libraries/ghc-bignum/ghc-bignum.cabal
- libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
- libraries/ghc-boot-th/ghc-boot-th.cabal.in
- + libraries/ghc-boot/GHC/Data/ShortByteString.hs
- libraries/ghc-boot/GHC/Data/ShortText.hs
- libraries/ghc-boot/GHC/Data/SizedSeq.hs
- compiler/GHC/Data/SmallArray.hs → libraries/ghc-boot/GHC/Data/SmallArray.hs
- libraries/ghc-boot/GHC/Settings/Utils.hs
- libraries/ghc-boot/GHC/Unit/Database.hs
- libraries/ghc-boot/ghc-boot.cabal.in
- libraries/ghc-compact/ghc-compact.cabal
- libraries/ghc-compact/tests/all.T
- libraries/ghc-experimental/CHANGELOG.md
- libraries/ghc-experimental/ghc-experimental.cabal.in
- libraries/ghc-experimental/src/Data/Sum/Experimental.hs
- libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
- libraries/ghc-experimental/src/GHC/Exception/Backtrace/Experimental.hs
- libraries/ghc-experimental/src/GHC/PrimOps.hs
- libraries/ghc-experimental/src/GHC/Profiling/Eras.hs
- libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs
- + libraries/ghc-experimental/src/GHC/Stack/Decode/Experimental.hs
- libraries/ghc-experimental/src/GHC/TypeNats/Experimental.hs
- + libraries/ghc-experimental/tests/Makefile
- libraries/base/src/GHC/Weak/Finalizehs → libraries/ghc-experimental/tests/all.T
- libraries/base/tests/perf/Makefile → libraries/ghc-experimental/tests/backtraces/Makefile
- + libraries/ghc-experimental/tests/backtraces/T26806a.hs
- + libraries/ghc-experimental/tests/backtraces/T26806a.stderr
- + libraries/ghc-experimental/tests/backtraces/T26806b.hs
- + libraries/ghc-experimental/tests/backtraces/T26806b.stderr
- + libraries/ghc-experimental/tests/backtraces/T26806c.hs
- + libraries/ghc-experimental/tests/backtraces/T26806c.stderr
- + libraries/ghc-experimental/tests/backtraces/all.T
- libraries/ghc-heap/GHC/Exts/Heap/Closures.hs
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
- + libraries/ghc-heap/tests/T27465.hs
- + libraries/ghc-heap/tests/T27465.stdout
- libraries/ghc-heap/tests/all.T
- libraries/ghc-heap/tests/tso_and_stack_closures.hs
- libraries/ghc-internal/CHANGELOG.md
- libraries/ghc-internal/bignum-backend.rst
- libraries/ghc-internal/cbits/Stack.cmm
- libraries/ghc-internal/cbits/consUtils.c
- libraries/ghc-internal/codepages/MakeTable.hs
- libraries/ghc-internal/configure.ac
- libraries/ghc-internal/ghc-internal.buildinfo.in
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/include/CTypes.h
- libraries/ghc-internal/include/HsIntegerGmp.h.in
- libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
- libraries/ghc-internal/src/GHC/Internal/Arr.hs
- libraries/ghc-internal/src/GHC/Internal/Base.hs
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- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/FFI.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Selected.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs
- libraries/ghc-internal/src/GHC/Internal/Bits.hs
- libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs
- − libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs-boot
- libraries/ghc-internal/src/GHC/Internal/CString.hs
- libraries/ghc-internal/src/GHC/Internal/Char.hs
- libraries/ghc-internal/src/GHC/Internal/Classes.hs
- + libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs
- libraries/ghc-internal/src/GHC/Internal/Clock.hsc
- libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs
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- libraries/ghc-internal/src/GHC/Internal/Conc/Signal.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
- − libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Conc/Windows.hs
- libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
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- libraries/ghc-internal/src/GHC/Internal/Control/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad.hs
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- libraries/ghc-internal/src/GHC/Internal/Control/Monad/IO/Class.hs
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- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Bits.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Dynamic.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Either.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Eq.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Function.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Const.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Utils.hs
- libraries/ghc-internal/src/GHC/Internal/Data/IORef.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Ix.hs
- libraries/ghc-internal/src/GHC/Internal/Data/List.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Monoid.hs
- libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Ord.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Proxy.hs
- libraries/ghc-internal/src/GHC/Internal/Data/STRef.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Semigroup/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Data/String.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Traversable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Coercion.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Equality.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Typeable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Typeable/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Unique.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Version.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs
- libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Encoding/UTF8.hs
- libraries/ghc-internal/src/GHC/Internal/Enum.hs
- libraries/ghc-internal/src/GHC/Internal/Environment.hs
- libraries/ghc-internal/src/GHC/Internal/Err.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Array.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Control.hs
- libraries/ghc-internal/src/GHC/Internal/Event/EPoll.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/IntVar.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Internal/Types.hs
- libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Manager.hs
- libraries/ghc-internal/src/GHC/Internal/Event/PSQ.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Poll.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Event/TimeOut.hs
- libraries/ghc-internal/src/GHC/Internal/Event/TimerManager.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Unique.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/Clock.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/ConsoleEvent.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/FFI.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/ManagedThreadPool.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
- libraries/ghc-internal/src/GHC/Internal/ExecutionStack.hs
- libraries/ghc-internal/src/GHC/Internal/ExecutionStack/Internal.hsc
- libraries/ghc-internal/src/GHC/Internal/Exts.hs
- libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs
- libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Fingerprint/Type.hs
- libraries/ghc-internal/src/GHC/Internal/Float.hs
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- libraries/ghc-internal/src/GHC/Internal/Float/RealFracMethods.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/ConstPtr.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/Error.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/String.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/String/Encoding.hs
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- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Alloc.hs
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- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs
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- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Windows.hs
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- − libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs
- libraries/ghc-internal/src/GHC/Internal/ST.hs
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- libraries/ghc-internal/src/GHC/Internal/System/IO.hs
- libraries/ghc-internal/src/GHC/Internal/System/IO/Error.hs
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- libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadP.hs
- libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadPrec.hs
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- + libraries/ghc-internal/tests/backtraces/T15395.hs
- + libraries/ghc-internal/tests/backtraces/T15395.stdout
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- libraries/ghc-platform/src/GHC/Platform/ArchOS.hs
- libraries/ghc-prim/changelog.md
- libraries/ghc-prim/ghc-prim.cabal
- − libraries/ghci/GHCi/BinaryArray.hs
- + libraries/ghci/GHCi/Coverage.hs
- libraries/ghci/GHCi/CreateBCO.hs
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- libraries/hpc
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- libraries/os-string
- libraries/parsec
- libraries/process
- libraries/semaphore-compat
- libraries/stm
- libraries/template-haskell-lift
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- libraries/terminfo
- libraries/text
- libraries/transformers
- libraries/unix
- libraries/xhtml
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- − linters/lint-notes/Makefile
- llvm-passes
- llvm-targets
- m4/find_llvm_prog.m4
- m4/fp_check_pthreads.m4
- − m4/fp_check_timer_create.m4
- m4/fp_cmm_cpp_cmd_with_args.m4
- m4/fp_find_nm.m4
- + m4/fp_linker_supports_verbatim.m4
- m4/fp_prog_cc_linker_target.m4
- m4/fp_setup_project_version.m4
- m4/fp_setup_windows_toolchain.m4
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- m4/ghc_toolchain.m4
- m4/prep_target_file.m4
- mk/system-cxx-std-lib-1.0.conf.in
- nofib
- packages
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- rts/AllocArray.h
- rts/Apply.cmm
- rts/Capability.c
- rts/Capability.h
- rts/CloneStack.c
- rts/CloneStack.h
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- rts/IOManagerInternals.h
- rts/IPE.c
- rts/Interpreter.c
- rts/Linker.c
- rts/LinkerInternals.h
- − rts/Makefile
- rts/ZeroSlop.c → rts/MarkSlop.c
- rts/Messages.c
- rts/PrimOps.cmm
- rts/Printer.c
- rts/ProfHeap.c
- rts/Profiling.c
- rts/RaiseAsync.c
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- rts/Updates.h
- rts/Weak.c
- rts/configure.ac
- rts/eventlog/EventLog.c
- rts/eventlog/EventLog.h
- rts/include/Cmm.h
- − rts/include/Makefile
- rts/include/Rts.h
- rts/include/RtsAPI.h
- rts/include/Stg.h
- rts/include/rts/Bytecodes.h
- rts/include/rts/Constants.h
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- rts/include/stg/MiscClosures.h
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- rts/include/stg/SMP.h
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- rts/js/arith.js
- rts/linker/Elf.c
- rts/linker/MachO.c
- rts/linker/PEi386.c
- + rts/posix/FdWakeup.c
- + rts/posix/FdWakeup.h
- + rts/posix/MIO.c
- + rts/posix/MIO.h
- rts/posix/Poll.c
- rts/posix/Poll.h
- rts/posix/Select.c
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[Git][ghc/ghc][wip/sjakobi/nonmoving-gc-test-fixes] 2 commits: rts/js: Implement eq_thread, and test Eq/Ord ThreadId (#16761)
by Simon Jakobi (＠sjakobi) 09 Aug '26
by Simon Jakobi (＠sjakobi) 09 Aug '26
09 Aug '26
Simon Jakobi pushed to branch wip/sjakobi/nonmoving-gc-test-fixes at Glasgow Haskell Compiler / GHC
Commits:
80465707 by Simon Jakobi at 2026-08-09T05:46:40+02:00
rts/js: Implement eq_thread, and test Eq/Ord ThreadId (#16761)
Since d1f3c63701 (#16761), Eq ThreadId is implemented via the RTS
function eq_thread, but the JS RTS never provided it, so comparing
ThreadIds for equality on the JS backend crashed with
ReferenceError: h$eq_thread is not defined
Like the C implementation, h$eq_thread uses pointer equality: The JS
RTS has exactly one thread object per thread.
Previously no test exercised eq_thread directly — the missing JS
implementation was only caught incidentally by listThreads1. Add a
test covering equality, its stability across GC, and agreement with
Ord.
Assisted-by: Claude Fable 5
- - - - -
91790b45 by Simon Jakobi at 2026-08-09T05:46:40+02:00
testsuite: Make listThreads1 insensitive to the RTS's own threads
listThreads1 expected `listThreads` to return exactly [ThreadId 1]. That
holds only under a non-threaded RTS. Under a threaded RTS however there
are more threads present, so we change the test to simply check that
`myThreadId` is present in the list.
Assisted-by: Claude Opus 5
- - - - -
6 changed files:
- libraries/base/tests/listThreads1.hs
- libraries/base/tests/listThreads1.stdout
- rts/js/thread.js
- + testsuite/tests/concurrent/should_run/T16761.hs
- + testsuite/tests/concurrent/should_run/T16761.stdout
- testsuite/tests/concurrent/should_run/all.T
Changes:
=====================================
libraries/base/tests/listThreads1.hs
=====================================
@@ -2,5 +2,10 @@ module Main where
import GHC.Conc.Sync
+-- Regression test for the JS backend's ListThreadsOp, which used to omit the
+-- running thread. Whatever other threads the RTS has is irrelevant here.
main :: IO ()
-main = listThreads >>= print
+main = do
+ tid <- myThreadId
+ ts <- listThreads
+ print (tid `elem` ts)
=====================================
libraries/base/tests/listThreads1.stdout
=====================================
@@ -1 +1 @@
-[ThreadId 1]
+True
=====================================
rts/js/thread.js
=====================================
@@ -110,6 +110,10 @@ function h$rts_getThreadId(t) { // returns a CULLong
RETURN_UBX_TUP2((t.tid / Math.pow(2,32))>>>0, (t.tid & 0xFFFFFFFF)>>>0);
}
+function h$eq_thread(t1,t2) {
+ return t1 === t2 ? 1 : 0;
+}
+
function h$cmp_thread(t1,t2) {
if(t1.tid < t2.tid) return -1;
if(t1.tid > t2.tid) return 1;
=====================================
testsuite/tests/concurrent/should_run/T16761.hs
=====================================
@@ -0,0 +1,25 @@
+-- Test that Eq ThreadId is based on thread identity (eq_thread),
+-- not on the numeric thread id, which may wrap around (#16761).
+module Main (main) where
+
+import Control.Concurrent
+import System.Mem (performGC)
+
+main :: IO ()
+main = do
+ t0 <- myThreadId
+ print (t0 == t0)
+
+ mv <- newEmptyMVar
+ _ <- forkIO (myThreadId >>= putMVar mv)
+ tChild <- takeMVar mv
+ print (t0 == tChild)
+ print (tChild == tChild)
+
+ -- Equality must be stable even after the GC moves the TSOs.
+ performGC
+ print (t0 == t0)
+
+ -- Ord must agree with Eq.
+ print (compare t0 tChild /= EQ)
+ print (compare t0 t0 == EQ)
=====================================
testsuite/tests/concurrent/should_run/T16761.stdout
=====================================
@@ -0,0 +1,6 @@
+True
+False
+True
+True
+True
+True
=====================================
testsuite/tests/concurrent/should_run/all.T
=====================================
@@ -310,6 +310,8 @@ test('hs_try_putmvar003',
# Check forkIO exception determinism under optimization
test('T13330', normal, compile_and_run, ['-O'])
+test('T16761', normal, compile_and_run, [''])
+
test('T26341', normal, compile_and_run, [''])
# Test EINTR for async I/O interrupted by an exception (#26341)
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