[Git][ghc/ghc][wip/jeltsch/control-monad-zip-to-base] 655 commits: Hide implementation details from base exception stack traces

10 Aug 2026

      Wolfgang Jeltsch pushed to branch wip/jeltsch/control-monad-zip-to-base at Glasgow Haskell Compiler / GHC

Commits:
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

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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.

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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.

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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@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.

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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)

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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

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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.

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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.

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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

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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

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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

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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.

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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.

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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@openai.com>

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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.

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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.

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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.

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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

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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

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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

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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@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@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

- - - - -
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

- - - - -
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

- - - - -
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.

- - - - -
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)

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
4636d906 by mangoiv at 2026-03-21T04:44:10-04:00
ci: remove obsolete fallback for old debian and ubuntu versions

- - - - -
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

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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

- - - - -
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.

- - - - -
c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00
Add regression test for #13729

Closes #13729.

- - - - -
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.

- - - - -
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).

- - - - -
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@anthropic.com>

- - - - -
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

- - - - -
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@gmail.com>

- - - - -
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.

- - - - -
57b7878d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12002

Closes #12002.

- - - - -
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@gmx.at>

- - - - -
615d72ac by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #13180

Closes #13180.

- - - - -
423eebcf by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11141

Closes #11141.

- - - - -
286849a4 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11505

Closes #11505.

- - - - -
7db149d9 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression perf test for #13820

Closes #13820.

- - - - -
e73c4adb by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #10381

Closes #10381.

- - - - -
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@haskus.fr>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

- - - - -
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

- - - - -
ef0a1bd2 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: adopt release tracking ticket from #16816

- - - - -
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

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
fe6e76c5 by Tobias Haslop at 2026-03-26T03:59:30-04:00
Fix broken Haddock link to Bifunctor class in description of Functor class

- - - - -
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.

- - - - -
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

- - - - -
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.

- - - - -
b26bb2ea by VeryMilkyJoe at 2026-03-27T04:41:38-04:00
Remove backwards compatibility pattern synonym `ModLocation`

Fixes #24932

- - - - -
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

- - - - -
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@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

- - - - -
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

- - - - -
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

- - - - -
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@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@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@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@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@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@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-mo...

- - - - -
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@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

- - - - -
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

- - - - -
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)

- - - - -
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

- - - - -
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@anthropic.com>

- - - - -
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

- - - - -
c5b80dd0 by Phil de Joux at 2026-04-13T15:16:51-04:00
Typo ~/ghc/arch-os-version/environments

- - - - -
71462fff by Luite Stegeman at 2026-04-13T15:17:38-04:00
add changelog entry for #26233

- - - - -
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.

- - - - -
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'

- - - - -
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
-------------------------

- - - - -
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

- - - - -
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...

- - - - -
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#)

- - - - -
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

- - - - -
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.

- - - - -
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@gmail.com>

- - - - -
a0d6f1f4 by Simon Jakobi at 2026-04-16T13:29:28-04:00
Add regression test for #9074

Closes #9074.

- - - - -
d178ee89 by Sylvain Henry at 2026-04-16T13:30:25-04:00
Add changelog for #15973

- - - - -
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
-------------------------

- - - - -
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

- - - - -
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.

- - - - -
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.

- - - - -
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

- - - - -
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

- - - - -
72d6dc74 by aparker at 2026-04-20T20:15:44-04:00
NCG: Implement constant folding for vector simd ops (Issue #25030)

- - - - -
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".

- - - - -
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

- - - - -
04d143c0 by Luite Stegeman at 2026-04-21T14:05:33-04:00
rts: add a few missing i386 relocations in the rts linker

- - - - -
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

- - - - -
915bba6f by Simon Jakobi at 2026-04-21T14:06:16-04:00
Add regression test for #10531

Closes #10531.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
2ea7ef8e by Cheng Shao at 2026-04-23T09:46:26+00:00
changelog: add llvm 22.x support

- - - - -
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.

- - - - -
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

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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

- - - - -
f3485446 by fendor at 2026-04-28T13:24:12-04:00
Expose startupHpc as an rts symbol

- - - - -
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

- - - - -
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.

- - - - -
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

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
b35946ad by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add a changelog.d entry for the .cmm import syntax changes

- - - - -
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

- - - - -
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@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
-------------------------

- - - - -
e16854c3 by Vladislav Zavialov at 2026-04-30T04:56:57-04:00
Replace GHC 9.16 references with GHC 10.0

- - - - -
39141343 by Alice Rixte at 2026-05-01T14:09:32+02:00
Add Bounded instances for Double, Float, CDouble and CFloat

- - - - -
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@anthropic.com>

- - - - -
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@anthropic.com>

- - - - -
3b75cccd by fendor at 2026-05-02T03:40:14-04:00
Fix name of Note [Structure of dep_boot_mods]

- - - - -
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.

- - - - -
8ff4fdb5 by David Eichmann at 2026-05-05T14:44:37-04:00
Hadrian: Disable runtime pseudo relocations for RTS on windows hosts

- - - - -
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

- - - - -
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

- - - - -
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

- - - - -
7e9eb8b9 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add SymI_HasProto for start/endEventLogging

- - - - -
3a3045fb by Wen Kokke at 2026-05-06T09:53:41-04:00
rts: Add changelog entry

- - - - -
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

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
44cf9cd7 by Wolfgang Jeltsch at 2026-05-12T09:48:18-04:00
Move the `Text.Read` implementation into `base`

- - - - -
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.

- - - - -
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.

- - - - -
e4e22bfb by Duncan Coutts at 2026-05-12T09:49:48-04:00
Update the default host and target files for dlltool support

- - - - -
5666c8f9 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add dlltool as a hadrian builder

Optional except on windows.

- - - - -
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).

- - - - -
c8dae539 by Alice Rixte at 2026-05-12T09:50:52-04:00
Script for downloading and copying `base-exports` file

- - - - -
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@gmail.com>
Co-authored-by: Fendor <fendor@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.

- - - - -
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.

- - - - -
62536551 by Wen Kokke at 2026-05-19T12:44:53-04:00
ghc-internal: Add TraceFlags.traceIPE

- - - - -
e45312d1 by Wen Kokke at 2026-05-19T12:44:53-04:00
testsuite: Add test for TraceFlags.traceIpe

- - - - -
4768d9aa by Wen Kokke at 2026-05-19T12:44:53-04:00
ghc-internal: Add DebugFlags.ipe

- - - - -
bc1b5c69 by Wen Kokke at 2026-05-19T12:44:53-04:00
testsuite: Add test for DebugFlags.ipe

- - - - -
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.

- - - - -
b2911514 by Duncan Coutts at 2026-05-19T12:45:37-04:00
Fix section for an recent changelog entry

- - - - -
d6d76a7a by David Eichmann at 2026-05-19T12:46:19-04:00
ghc-toolchain: implement llvm program versioning logic

- - - - -
2dd36fa3 by Wolfgang Jeltsch at 2026-05-20T04:49:52-04:00
Turn `Trustworthy` into `Safe` in `base` where possible

- - - - -
f4399dd1 by Wolfgang Jeltsch at 2026-05-20T04:50:37-04:00
Make the current `base` buildable with GHC 10.0

- - - - -
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@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@gmail.com>

- - - - -
f4fbb583 by Simon Jakobi at 2026-05-28T12:26:04-04:00
Add regression test for T11226

Closes #11226.

- - - - -
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@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@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@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@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@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@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@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@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/a51c4ee1556d816ad86e90db7e6330dd51b0b6...

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=ccead81bbc39668376eb5cf47066ac...

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@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@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@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@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@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+Copilot@users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Assisted-by: Codex <codex@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@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@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@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@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@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@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@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@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@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@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@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@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@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.

- - - - -
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.

- - - - -
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

- - - - -
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

- - - - -
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@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

- - - - -
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

- - - - -
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.

- - - - -
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

- - - - -
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.

- - - - -
8f0bdbe1 by Duncan Coutts at 2026-07-23T17:26:19-04:00
Add a changelog entry

- - - - -
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@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@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-la....

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@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

- - - - -
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

- - - - -
61200c2f by Wolfgang Jeltsch at 2026-08-10T16:24:42+03:00
Move the implementation of `Control.Monad.Zip` to `base`

- - - - -

2811 changed files:

- .gitignore
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/generate-ci/flake.lock
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/issue_templates/default.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
- boot
- + 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
- + changelog.d/T25636
- + changelog.d/T26423
- + changelog.d/T26532
- + changelog.d/T26716
- + changelog.d/T26978
- + changelog.d/T26979
- + changelog.d/T27022
- + changelog.d/T27046
- + changelog.d/T27047
- + changelog.d/T27121.md
- + changelog.d/T27123.md
- + changelog.d/T27124.md
- + changelog.d/T27131
- + changelog.d/T27182.md
- + changelog.d/T27202
- + changelog.d/T27225
- + changelog.d/T27261
- + changelog.d/T27308
- + changelog.d/T27314.md
- + changelog.d/T27317
- + changelog.d/T27329
- + 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
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- 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
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- compiler/GHC/Cmm/CommonBlockElim.hs
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- compiler/GHC/Cmm/Dataflow/Label.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/LayoutStack.hs
- compiler/GHC/Cmm/Lexer.x
- compiler/GHC/Cmm/Liveness.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Node.hs
- compiler/GHC/Cmm/Opt.hs
- compiler/GHC/Cmm/Parser.y
- 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/LA64/CodeGen.hs
- compiler/GHC/CmmToAsm/LA64/Instr.hs
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- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
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- compiler/GHC/CmmToAsm/RV64/CodeGen.hs
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- compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
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- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/Lint.hs
- + compiler/GHC/Core/Lint/SubstTypeLets.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- 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/Range.hs
- compiler/GHC/Core/Opt/SetLevels.hs
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- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
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- compiler/GHC/Core/RoughMap.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
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- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/TyCon/Env.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/AddImplicitBinds.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/BooleanFormula.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Data/FastString/Env.hs
- compiler/GHC/Data/IOEnv.hs
- compiler/GHC/Data/List/NonEmpty.hs
- compiler/GHC/Data/List/SetOps.hs
- compiler/GHC/Data/Pair.hs
- compiler/GHC/Data/StringBuffer.hs
- compiler/GHC/Data/TrieMap.hs
- 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/Driver/Backend.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/CodeOutput.hs
- compiler/GHC/Driver/Config.hs
- compiler/GHC/Driver/Config/CmmToLlvm.hs
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- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
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- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Hooks.hs
- compiler/GHC/Driver/Main.hs
- + compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot
- + compiler/GHC/Driver/Main/Hsc.hs
- + compiler/GHC/Driver/Main/Interactive.hs
- + compiler/GHC/Driver/Main/Passes.hs
- + compiler/GHC/Driver/Main/Passes.hs-boot
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- compiler/GHC/Driver/MakeAction.hs
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- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Decls/Overlap.hs
- compiler/GHC/Hs/Doc.hs
- − 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
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Pat.hs
- − compiler/GHC/Hs/Specificity.hs
- compiler/GHC/Hs/Stats.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- 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
- compiler/GHC/HsToCore/Coverage.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Errors/Ppr.hs
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- compiler/GHC/HsToCore/Foreign/C.hs
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- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Parser/String.hs
- compiler/GHC/Parser/Types.hs
- compiler/GHC/Platform.hs
- + compiler/GHC/Platform/Tag.hs
- compiler/GHC/Platform/Ways.hs
- compiler/GHC/Prelude/Basic.hs
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- 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
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- compiler/GHC/Rename/Pat.hs
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- + compiler/GHC/Tc/Gen/Expand.hs
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- compiler/GHC/Types/FieldLabel.hs
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- 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/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
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- compiler/GHC/Types/SourceText.hs
- compiler/GHC/Types/SrcLoc.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Types/Unique/DSet.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
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- 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/Outputable.hs
- compiler/GHC/Utils/Ppr/Colour.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/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
- configure.ac
- distrib/configure.ac.in
- + docs/users_guide/10.2.1-notes.rst
- − docs/users_guide/9.16.1-notes.rst
- 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
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- 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/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
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- docs/users_guide/exts/stolen_syntax.rst
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- docs/users_guide/exts/syntax.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/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/runtime_control.rst
- docs/users_guide/using-optimisation.rst
- docs/users_guide/using-warnings.rst
- docs/users_guide/using.rst
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- + testsuite/tests/vdq-rta/should_fail/T27583f.hs
- + testsuite/tests/vdq-rta/should_fail/T27583f.stderr
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- testsuite/tests/warnings/should_fail/CaretDiagnostics1.hs
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- testsuite/tests/warnings/should_fail/T24396c.hs
- testsuite/tests/warnings/should_fail/T24396c.stderr
- testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs
- + utils/changelog-d/ChangelogD.hs
- + utils/changelog-d/LICENSE
- + utils/changelog-d/README.md
- + utils/changelog-d/changelog-d.cabal
- utils/check-exact/ExactPrint.hs
- utils/check-exact/Main.hs
- utils/check-exact/Parsers.hs
- utils/check-exact/Preprocess.hs
- utils/check-exact/Transform.hs
- utils/check-exact/Utils.hs
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- utils/deriveConstants/Main.hs
- utils/genprimopcode/Main.hs
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- utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
- utils/ghc-toolchain/src/GHC/Toolchain/Utils.hs
- utils/haddock/CONTRIBUTING.md
- utils/haddock/doc/.gitignore
- utils/haddock/doc/Makefile
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- utils/haddock/doc/conf.py
- utils/haddock/doc/markup.rst
- + utils/haddock/doc/snippets/.gitignore
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- utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
- utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/DocMarkup.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Meta.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Names.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Utils.hs
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- utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
- utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Json.hs
- utils/haddock/haddock-api/src/Haddock/Interface/LexParseRn.hs
- utils/haddock/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
- utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
- utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
- utils/haddock/haddock-api/src/Haddock/Options.hs
- utils/haddock/haddock-api/src/Haddock/Parser.hs
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- utils/haddock/haddock-api/src/Haddock/Utils.hs
- utils/haddock/haddock-api/src/Haddock/Utils/Json.hs
- utils/haddock/haddock-api/src/Haddock/Utils/Json/Parser.hs
- utils/haddock/haddock-api/src/Haddock/Utils/Json/Types.hs
- utils/haddock/haddock-library/haddock-library.cabal
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- utils/haddock/haddock-library/src/Documentation/Haddock/Markup.hs
- utils/haddock/haddock-library/src/Documentation/Haddock/Parser.hs
- utils/haddock/haddock-library/src/Documentation/Haddock/Parser/Util.hs
- utils/haddock/haddock-library/src/Documentation/Haddock/Types.hs
- utils/haddock/haddock-library/test/Documentation/Haddock/ParserSpec.hs
- utils/haddock/haddock-test/haddock-test.cabal
- utils/haddock/haddock-test/src/Test/Haddock/Config.hs
- utils/haddock/haddock.cabal
- utils/haddock/html-test/ref/A.html
- utils/haddock/html-test/ref/Bug1004.html
- utils/haddock/html-test/ref/Bug1033.html
- utils/haddock/html-test/ref/Bug1103.html
- utils/haddock/html-test/ref/Bug548.html
- utils/haddock/html-test/ref/Bug923.html
- utils/haddock/html-test/ref/Bug973.html
- utils/haddock/html-test/ref/ConstructorPatternExport.html
- utils/haddock/html-test/ref/DefaultSignatures.html
- utils/haddock/html-test/ref/FunArgs.html
- utils/haddock/html-test/ref/Hash.html
- utils/haddock/html-test/ref/Instances.html
- utils/haddock/html-test/ref/LinearTypes.html
- utils/haddock/html-test/ref/PatternSyns.html
- utils/haddock/html-test/ref/PatternSyns2.html
- utils/haddock/html-test/ref/QuasiExpr.html
- utils/haddock/html-test/ref/RedactTypeSynonyms.html
- utils/haddock/html-test/ref/T23616.html
- utils/haddock/html-test/ref/Test.html
- utils/haddock/html-test/ref/TypeFamilies3.html
- utils/haddock/html-test/src/LinearTypes.hs
- utils/haddock/latex-test/src/LinearTypes/LinearTypes.hs
- utils/hsc2hs
- utils/jsffi/dyld.mjs
- utils/jsffi/prelude.mjs

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/608ae5f9c71076f6ebf3f56e5885ec1...

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/608ae5f9c71076f6ebf3f56e5885ec1...
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Wolfgang Jeltsch (＠jeltsch)

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