[Git][ghc/ghc][wip/andreask/bump_nofib] 1032 commits: Fix buglet in isEmptyWorkList

19 Feb 2026

      Andreas Klebinger pushed to branch wip/andreask/bump_nofib at Glasgow Haskell Compiler / GHC

Commits:
cfaaca14 by sheaf at 2025-03-18T20:05:03-04:00
Fix buglet in isEmptyWorkList

There was a missing case in GHC.Tc.Solver.InertSet.isEmptyWorkList; it
mistakenly ignored the 'wl_rw_eqs' field. This commit simply fixes that.
No test case.

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9f9fe0b3 by sheaf at 2025-03-18T20:05:03-04:00
Add mapMaybeTM method to TrieMap class

This commit adds a new method to the TrieMap class, mapMaybeTM, and
adds implementations to all the instances.

mapMaybeTM is useful when filtering containers that contain other
containers.

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393531ff by Simon Peyton Jones at 2025-03-18T20:05:03-04:00
Specialising expressions -- at last

This MR addresses #24359, which implements the GHC proposal 493 on SPECIALISE pragmas.

* The old code path (using SpecSig and SpecPrag) still exists.
* The new code path (using SpecSigE and SpecPragE) runs alongside it.
* All SPECIALISE pragmas are routed through the new code path, except
  if you give multiple type sigs, when the old code path is still used.
* Main documentation: Note [Handling new-form SPECIALISE pragmas] in
  GHC.Tc.Gen.Sig`

Thanks to @sheaf for helping with this MR.

The Big Thing is to introduce

  {-# SPECIALISE forall x.  f @Int x True #-}

where you can give type arguments and value argument to specialise; and
you can quantify them with forall, just as in Rules.

I thought it was going to be pretty simple, but it was a Long, Long Saga.

Highlights

* Overview Note [Handling new-form SPECIALISE pragmas] in GHC.Tc.Gen.Sig
  - New data constructor `SpecSigE` in data type `L.H.S.Binds.Sig`
  - New data construtor `SpecPragE` in data type `GHC.Hs.Binds.TcSpecPrag`
  - Renamer: uses `checkSpecESigShape` to decide which function to assocate the
             SPECIALISE pragma with
  - Some of the action is in `GHC.Tc.Gen.Sig.tcSpecPrag`
  - The rest is in `GHC.HsToCore.Binds.dsSpec`

* We use a new TcS mode, TcSFullySolve, when simplifying the Wanteds
  that arise from the specialise expression. The mechanism is explained
  in Note [TcSFullySolve] in GHC.Tc.Solver.Monad. The reason why we need
  to do this is explained in Note [Fully solving constraints for specialisation]
  in GHC.Tc.Gen.Sig.

* All of GHC.Tc.Gen.Rule is moved into GHC.Tc.Gen.Sig, because the code is
  very closely related.

* The forall'd binders for SPECIALISE are the same as those for a RULE, so I
  refactored, introducing data type `L.H.S.Binds.RuleBndrs`, with functions
  to rename, zonk, typecheck it.  I refactored this data type a bit; nicer now.

* On the LHS of RULES, or SPECIALISE, we want to disable the tricky mechanims
  described in Note [Desugaring non-canonical evidence] in GHC.HsToCore.Expr.
  Previously it wasn't fully disabled (just set to the empty set), and that
  didn't quite work in the new regime.

* There are knock-on changes to Template Haskell.

* For the LHS of a RULE and a SPECIALISE expression, I wanted to simplify
  it /without/ inlining the let-bindings for evidence variables.  I added
  a flag `so_inline` to the SimpleOpt optimiser to support this.  The
  entry point is `GHC.Core.SimpleOpt.simpleOptExprNoInline`

* Since forever we have had a hack for type variables on the LHS of
  RULES. I took the opportunity to tidy this up.  The main action is
  in the zonker.  See GHC.Tc.Zonk.Type Note [Free tyvars on rule LHS],
  and especially data construtor `SkolemiseFlexi`
  in data type `GHC.Tc.Zonk.Env.ZonkFlexi`

* Move `scopedSort` from GHC.Core.TyCo.FVs to GHC.Core.Predicate
  Reason: it now works for Ids as well, and I wanted to use isEvVar,
          which is defined in GHC.Core.Predicate
  Avoiding module loops meant that instead of exporting GHC.Core.TyCo.Tidy
  from GHC.Core.Type, modules now import the former directly.

  I also took the opportunity to remove unused exports
  from GHC.Core.Type.hs-boot

* Flag stuff:
  - Add flag `-Wdeprecated-pragmas` and use it to control the warning when
    using old-style SPECIALISE pragmas with multiple type ascriptions,

  - Add flag `-Wuseless-specialisations` and use it to control the warning emitted
    when GHC determines that a SPECIALISE pragma would have no effect. Don't
    want if the SPECIALISE is SPECIALISE INLINE (#4444)

    In response to #25389, we continue to generate these seemingly code for these
    seemingly useless SPECIALISE pragmas

  - Adds deprecations to Template Haskell `pragSpecD` and `pracSpecInlD`,

* Split up old-style SPECIALISE pragmas in GHC.Internal.Float,
  GHC.Internal.Numeric, GHC.Internal.Real

* Remove useless SPECIALISE pragmas in Data.Array (updating the array submodule)

Smaller things:

- Update the Users Guide

- Add mention of the changes to the 9.14 release notes as well as
  the Template Haskell changelog,

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1884dd1a by Simon Peyton Jones at 2025-03-18T20:05:03-04:00
Add -Wrule-lhs-equalities warning

This commit adds a new warning, controlled by the warning flag,
-Wrule-lhs-equalities, which is emitted when the LHS of a RULE gives
rise to equality constraints that previous GHC versions would have
quantified over.

GHC instead discards such RULES, as GHC was never able to generate
a rule template that would ever fire; it's better to be explicit about
the fact that the RULE doesn't work.

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b00b3ef0 by Ben Gamari at 2025-03-18T20:05:41-04:00
compiler: Add export list to GHC.SysTools.Process

This also revealed that `readProcessEnvWithExitCode` and its local
helpers were dead code.

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25850b22 by ARATA Mizuki at 2025-03-18T20:06:25-04:00
Fix code generation for SSE vector operations

The new implementation generates correct code
even if the registers overlap.

Closes #25859

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e576468c by Andreas Klebinger at 2025-03-18T20:07:02-04:00
Bump nofib submodule.

Fixes #25867. (Ben-raytrace being broken by library changes)

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443fc8b1 by Sjoerd Visscher at 2025-03-19T12:01:04-04:00
Multiplicity annotation on records

Needing to store multiplicity annotations on records triggered a refactoring of AST of data declarations:

Moved HsBangTy and HsRecTy from HsType to HsTypeGhcPsExt, the extension of HsType during parsing, since they are only needed during parsing.

New HsConDeclField that stores all source data shared by all constructor declaration fields: unpackedness, strictness, multiplicity, documentation and the type of the field.

Merged HsMultAnn and HsArrowOf, so all multiplicity annotations share the same data type.

HsBang was no longer needed as a separate type, and was inlined into HsSrcBang.

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313cf271 by Ben Gamari at 2025-03-19T12:01:43-04:00
gitlab-ci: Drop CentOS 7 binary distributions

CentOS 7 is EoL and moreover we cannot even build images for it.

See #25061.

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5b94f99f by Ben Gamari at 2025-03-19T12:02:21-04:00
rts: Ensure that WinIO flag is set when --io-manager=auto

As noted in #25838, previously `selectIOManager` failed to set
`rts_IOManagerIsWin32Native` in its `IO_MNGR_FLAG_AUTO`. This meant
that the MIO path was taken when WinIO was supposedly selected,
resulting in chaos.

Fixes #25838.

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1a3f1131 by Peng Fan at 2025-03-19T12:03:10-04:00
Pass the mcmodel=medium parameter to CC via GHC

Ensure that GHC-driver builds default to mcmodel=medium, so that GHC
passes this default parameter to CC without having to add it to the
compiled project.

Commit e70d41406b5d5638b42c4d8222cd03e76bbfeb86 does not ensure that all
GHC-built object files have a default model of medium, and will raise an
R_LARCH_B26 overflow error.

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27cf7361 by Matthew Craven at 2025-03-19T12:03:48-04:00
Add interface-stability test for ghc-bignum

As with ghc-prim, it makes sense to have some protection against
accidental interface changes to this package caused by changes
in ghc-internal.

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25d46547 by Matthew Craven at 2025-03-19T12:03:48-04:00
Add README reference for the interface-stability tests

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5d65393e by Simon Peyton Jones at 2025-03-20T05:41:24-04:00
Remove the Core flattener

This big MR entirely removes the "flattener" that took a type and
replaced each type-family application with a fresh type variable.
The flattener had its origin in the paper
     Injective type families for Haskell

But (a) #25657 showed that flattening doesn't really work.
    (b) since we wrote the paper we have introduced the so-called
        "fine-grained" unifier GHC.Core.Unify, which can return
                 * SurelyApart
                 * Unifiable subst
                 * MaybeApart subst
        where the MaybeApart says that the two types are not unifiable by a
        substitution, but could (perhaps) be unified "later" after some type
        family reductions.  This turns out to subsume flattening.

This MR does a major refactor of GHC.Core.Unify to make it capable of
subsuming flattening.   The main payload is described in
       Note [Apartness and type families]
and its many wrinkles.

The key (non-refactoring) implementation change is to add `um_fam_env`
to the `UMState` in the unification monad.

Careful review with Richard revealed various bugs in the treament of
`kco`, the kind coercion carried around by the unifier, so that is
substantially fixed too: see Note [Kind coercions in Unify].

Compile-time performance is improved by 0.1% with a few improvements over
1% and one worsening by 1.3% namely T9872a.  (I have not investigated the
latter.)

Metric Decrease:
    T9872b
    T9872c
    TcPlugin_RewritePerf
Metric Increase:
    T9872a

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9003ef0a by sheaf at 2025-03-20T05:42:08-04:00
Remove SDoc from UnknownSubordinate/MissingBinding

This commit replaces unstructured SDoc arguments in error message constructors
with uses of the following two datatypes:

  - SigLike: for different kinds of signatures (e.g. standalone kind signatures,
    fixity signatures, COMPLETE pragmas, etc)
  - Subordinate: for class methods, associated types, and record fields

The following error message constructors now no longer have any SDocs in them:

  - TcRnIllegalBuiltinSyntax: SDoc -> SigLike
  - MissingBinding: SDoc -> SigLike
  - UnknownSubordinate: SDoc -> (Name, Subordinate)
  - SuggestMoveToDeclarationSite: SDoc -> SigLike

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4329f3b6 by sheaf at 2025-03-20T05:42:08-04:00
Remove SDocs from HsDocContext

This commit removes the remaining SDocs from the HsDocContext data type.
It adds the following constructors:

  ClassInstanceCtx  -- Class instances
  ClassMethodSigCtx -- Class method signatures
  SpecialiseSigCtx  -- SPECIALISE pragmas
  PatSynSigCtx      -- Pattern synonym signatures

We now report a bit more information for errors while renaming class instances,
which slightly improves renamer-emitted error messages.

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75c29aa1 by sheaf at 2025-03-20T05:42:08-04:00
Reject instance with non-class head in renamer

This commit modifies rnClsInstDecl so that, when renaming, we reject a class
instance declaration in which the head is not a class. Before this change, it
would get rejected in the type-checker, but that meant that the renamer could
emit unhelpful error messages, e.g.:

  data Foo m a
  instance Foo m where
    fmap _ x = case x of

would rather unhelpfully say:

    ‘fmap’ is not a (visible) method of class ‘Foo’

when of course 'Foo' is not even a class. We now reject the above program
with the following error message:

    Illegal instance for data type ‘Foo’.
    Instance heads must be of the form
      C ty_1 ... ty_n
    where ‘C’ is a class.

Fixes #22688

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a8f543a9 by Cheng Shao at 2025-03-20T18:47:19-04:00
testsuite: mark T7919 as fragile on i386 as well

T7919 may also fail i386 CI jobs with test timeout.

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256ac29c by sheaf at 2025-03-20T18:48:07-04:00
Don't cache solved [W] HasCallStack constraints

This commit ensures we do not add solved Wanted constraints that mention
HasCallStack or HasExceptionContext constraints to the set of solved
Wanted dictionary constraints: caching them is invalid, because re-using
such cached dictionaries means using an old call-stack instead of
constructing a new one, as was reported in #25529.

Fixes #25529.

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47646ce2 by Andrew Lelechenko at 2025-03-20T18:48:43-04:00
Improve haddock-visible documentation for GHC.Driver.Flags

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2e4e15ed by Sylvain Henry at 2025-03-21T17:49:36-04:00
Document -fnum-constant-folding (#25862)

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044a6e08 by sheaf at 2025-03-21T17:50:24-04:00
LLVM: fix typo in padLiveArgs

This commit fixes a serious bug in the padLiveArgs function, which
was incorrectly computing too many padding registers. This caused
segfaults, e.g. in the UnboxedTuples test.

Fixes #25770
Fixes #25773

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1745c749 by Teo Camarasu at 2025-03-22T18:42:37-04:00
template-haskell: remove Language.Haskell.TH.Lib.Internal

This module is purely used for the implementation of TH quote
desugarring.

Historically this needed to be exposed from `template-haskell`, since
that's the package that the desugarred expressions referenced but since
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12479, this is no
longer the case.

Now these identifiers are in `ghc-internal`.

Note that this module has carried the following warning for a long time:
...
This is not a part of the public API, and as such, there are no API guarantees for this
module from version to version.
Resolves #24766

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3bc507db by Alan Zimmerman at 2025-03-22T18:43:13-04:00
EPA: Fix exact printing of SPECIALISE pragma

This commit fixes two minor issues with exactprinting of the
SPECIALISE pragma after !12319 landed

- The span for the RHS did not include the optional signature type
- The `::` was printed twice when the legacy path was used

Closes #25885

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bdf93da8 by sheaf at 2025-03-24T11:25:12+01:00
Renamer: improve handling of export children

This commit refactors the 'childGREPriority' function which is used when
renaming subordinate items in export lists and class declarations.

Instead of having a complicated LookupChild parameter, we now simply pass the
GREInfo of the parent, which allows us to decide what is a valid child:

  - classes can have children that are in the type constructor namespace,
  - promoted data constructors should be treated the same as normal data
    constructors.

Fixes #24027

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1dbc7846 by Matthew Pickering at 2025-03-24T15:35:17-04:00
Revert "mk-ghcup-metadata: Clean up and add type annotations"

This reverts commit 64ea68d9a206ec4db5020b0a3fc563199ab18be3.

See #25889

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6941c825 by doyougnu at 2025-03-25T10:05:58-04:00
base: construct compat RTSFlags

-- see CLC #289

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730e6f77 by doyougnu at 2025-03-25T10:06:02-04:00
base: construct compat GHC.Stats

-- see CLC #289

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cd9e6605 by Ben Gamari at 2025-03-25T17:59:52-04:00
rel_eng/upload: Clarify usage directions

Previously it was not made clear that the directory name is significant.

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7d18c19b by Cheng Shao at 2025-03-25T22:00:56+00:00
ghci: make the Pipe type opaque

This commit makes the Pipe type in ghci opaque, and introduce the
mkPipeFromHandles constructor for creating a Pipe from a pair of
Handles. Pipe is now just a pair of receiver/sender continuations
under the hood. This allows a Pipe to be potentially backed by other
IPC mechanisms (e.g. WebSockets) which is essential for wasm ghci
browser mode.

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a2103fd2 by Cheng Shao at 2025-03-25T22:00:56+00:00
ghci: use improved Pipe logic for wasm iserv

This commit makes wasm iserv take advantage of the Pipe refactoring by
passing binary receiver/sender js callbacks from the dyld script. This
paves the way for piping the binary messages through WebSockets in
order to run wasm iserv in the browser, but more importantly, it
allows us to get rid of a horrible hack in the dyld script: we no
longer have to fake magical wasi file descriptors that are backed by
nodejs blocking I/O! The legacy hack was due to these facts:

- iserv only supported exchanging binary messages via handles backed
  by file descriptors
- In wasi you can't access host file descriptors passed by host ghc
- The nodejs wasi implementation only allows mapping host directories
  into the wasi vfs, not host file descriptors
- Named pipes with file paths (mkfifo) doesn't work well with nodejs
  wasi implementation, causes spurious testsuite failures on macos

But starting from this point, we can fully take advantage of
non-blocking I/O on the js side.

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fa2fbd2b by Cheng Shao at 2025-03-25T22:00:56+00:00
ghci: fix ^C handling for wasm iserv

This commit fixes ^C handling for wasm iserv. Previously we didn't
handle it at all, so ^C would kill the node process and host ghc would
then crash as well. But native ghc with external interpreter can
handle ^C just fine and wasm should be no different. Hence the fix:
wasm iserv exports its signal handler as a js callback to be handled
by the dyld script. Also see added note for details.

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efcebed6 by Cheng Shao at 2025-03-25T22:00:56+00:00
wasm: fix post-link.mjs for browser

The wasm ghci browser mode needs to run dyld.mjs in the browser which
imports post-link.mjs. This script makes post-link.mjs runnable in the
browser by deferring node-specific module imports to their actual use
sites.

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27bb73c6 by Cheng Shao at 2025-03-25T22:00:56+00:00
wasm: use console.assert in dyld script

This commit uses console.assert() instead of node-specific strict
assert in the dyld script, in order to make it runnable in the
browser. console.assert() only warns and doesn't crash upon assertion
failure, but this is fine; we can always trivially define a strict
assert function shall it be necessary when debugging, and there hasn't
been such an assertion failure seen in the wild for long enough.

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929df0ba by Cheng Shao at 2025-03-25T22:00:56+00:00
wasm: asyncify the dylink.0 custom section parser

This commit refactors the simple binary parser in the dyld script in
charge of parsing the dylink.0 custom section. Previously the parser
was synchronous and operated on the entire input buffer; this was
simple and easy and worked well enough when the input wasm modules are
instantly read from local filesystem.

However, when running dyld in the browser, the wasm modules are
transferred via fetch() requests. The host ghc and the browser might
not be on the same machine, so slow network uplink does need to be
considered. We only need to parse dylink.0 custom section to extract
dependency info, and dylink.0 is the very first custom section in the
wasm shared library binary payload, so the parsing process should not
require fetch() to complete and should return the parsing result asap.

Hence the refactorings in this commit: asyncify the parser, make it
only consume as many bytes as needed by invoking an async consumer
callback. The input is a readable stream from the fetch() response;
once the response is available, the async wasm compilation can start
in the background, and dylink.0 parsing shall end asap which results
in more wasm shared libraries to be loaded earlier. Profit.

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9a697181 by Cheng Shao at 2025-03-25T22:00:56+00:00
wasm: fix dyld setImmediate usage in browser

The wasm dyld script used to only run in node and directly uses
setImmediate in globalThis. In case of browsers, it needs to import
setImmediate from the prelude, hence this commit.

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d9b71e82 by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: fix dyld downsweep filepath handling in browser

The wasm dyld downsweep logic used to rely on nodejs path module to
handle filepaths. That's not available in browsers, so this commit
implements poor man's filepath handling in js, which is not elegant
for sure but works for both nodejs and the browser.

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7003a399 by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: isolate nodejs-specific logic with the isNode flag in dyld

As we move towards supporting running the dyld script in the browser,
this commit implements the isNode module-level binding which is true
if dyld is running in nodejs. The nodejs-specific bits are gated under
isNode.

For the browser case, this commit introduces @bjorn3/browser_wasi_shim
as the wasi implementation; we already use it in quite a few projects
and it simply works.

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22ba2a78 by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: isolate dyld side effects that might require IPC

This commit spins out a DyLDHost class from DyLD that handles side
effects that must be run in the same host environment that runs
wasm32-wasi-ghc. When the dyld script runs in the browser, it'll need
to do IPC to find libraries, fetch wasm library, etc, and the other
side of dyld that runs on nodejs would simply expose the DyLDHost
methods as endpoints for WebSockets/HTTP.

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e93fc33d by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: implement wasm ghci browser mode

This commit implements the rest of dyld logic that delivers the ghci
browser mode:

- The dyld script can now fully run in the browser. It communicates
  back with dyld-on-nodejs via WebSockets and also plain HTTP 1.1
  requests.
- The host dyld starts a server and acts as a broker between the GHC
  process and the browser side. GHC doesn't need to know anything
  about the browser mode; no driver flags need to be added and no
  recompilation needs to happen, the GHC driver continues to use the
  original iserv binary messages protocol.
- The dyld broker doesn't need to parse any message between the
  browser dyld and GHC; it merely sets up WebSockets connections to
  redirect these messages as well as ^C signals.
- Plain HTTP 1.1 is used for IPC requests (e.g. downloading a wasm
  module).
- The dyld broker serves a main.js script that bootstraps iserv in the
  browser, and a main.html empty page playground for testing. CORS is
  enabled so it could be possible to inject iserv into other websites
  and use ghci to play with them.
- All the RPC logic is opaque to the DyLD class, the majority of the
  wasm dynamic linker code is already portable and runs fine in
  firefox/chrome/webkit.

Closes #25399.

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fc576798 by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: add puppeteer/playwright support for ghci browser mode

This commit adds support for using puppeteer/playwright for
automatically launching a headless browser that backs the ghci browser
mode. This is useful for testing the ghci browser mode as a part of
GHC testsuite, and it's also convenient for local development since
the step to start iserv can be automated away.

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ad7e271d by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: support wasi console redirect for the ghci browser mode

This commit adds optional support for redirecting wasi console
stdout/stderr back to the host when running wasm ghci browser mode. By
default, the wasi console outputs are only available under F12
devtools console, but in case of testing against a mobile browser, the
devtools console may not be readily available, and it would be more
convenient to at least get wasi console output on the host side.

The redirection logic is simple, just adding another two WebSockets
connections that pump the line-buffered textual messages back to
host.

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731217ce by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: add brotli compression for ghci browser mode

This commit adds brotli compression for wasm shared libraries for ghci
browser mode. With BROTLI_MIN_QUALITY, the overhead is negligible, and
it helps reducing amount of transferred data when the browser connects
to the server over a slow connection.

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ac70e643 by Cheng Shao at 2025-03-26T13:37:19+00:00
testsuite: add browser001 test for wasm ghci browser mode

This commit adds support for testing the wasm ghci browser mode in the
testsuite, as well as a simple first test case browser001 that makes
use of TH, JSFFI and browser-specific DOM API. See added note and
comments for details.

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6ef5c0d2 by Cheng Shao at 2025-03-26T13:37:24+00:00
docs: add wasm ghci subsection in user manual

This commit updates the user manual to add wasm ghci subsection.

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37381bcf by Cheng Shao at 2025-03-26T13:37:24+00:00
docs: update Note [The Wasm Dynamic Linker]

This commit updates Note [The Wasm Dynamic Linker] to reflect recent
developments, in particular the wasm ghci browser mode.

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4b5a0f61 by Cheng Shao at 2025-03-26T13:37:24+00:00
ci: bump DOCKER_REV and test wasm ghci browser mode

This commit bumps the ci-images revision for updated wasm toolchain,
and adds the launch options required to test wasm ghci browser mode.

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c6a3bc8f by Cheng Shao at 2025-03-26T13:37:24+00:00
driver: implement wasm ghci browser mode flags

This commit implements GHC driver flags that enable the wasm ghci
browser mode.

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f75e823e by Cheng Shao at 2025-03-26T18:01:54-04:00
rts: add hs_try_putmvar_with_value to RTS API

This commit adds hs_try_putmvar_with_value to rts. It allows more
flexibility than hs_try_putmvar by taking an additional value argument
as a closure to be put into the MVar. This function is used & tested
by the wasm backend runtime, though it makes sense to expose it as a
public facing RTS API function as well.

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9cd9f347 by Cheng Shao at 2025-03-26T18:01:54-04:00
wasm: use MVar as JSFFI import blocking mechanism

Previously, when blocking on a JSFFI import, we push a custom
stg_jsffi_block stack frame and arrange the `promise.then` callback to
write to that stack frame. It turns out we can simply use the good old
MVar to implement the blocking logic, with a few benefits:

- Less maintenance burden. We can drop the stg_jsffi_block related Cmm
  code without loss of functionality.
- It interacts better with existing async exception mechanism. throwTo
  would properly block the caller if the target thread is masking
  async exceptions.

- - - - -
da34f0aa by Cheng Shao at 2025-03-26T18:01:54-04:00
wasm: properly pin the raiseJSException closure

We used to use keepAlive# to pin the raiseJSException closure when
blocking on a JSFFI import thunk, since it can potentially be used by
RTS. But raiseJSException may be used in other places as well (e.g.
the promise.throwTo logic), and it's better to simply unconditionally
pin it in the JSFFI initialization logic.

- - - - -
dc904bfd by Cheng Shao at 2025-03-26T18:01:54-04:00
wasm: implement promise.throwTo() for async JSFFI exports

This commit implements promise.throwTo() for wasm backend JSFFI
exports. This allows the JavaScript side to interrupt Haskell
computation by raising an async exception. See subsequent docs/test
commits for more details.

- - - - -
7f80455e by Cheng Shao at 2025-03-26T18:01:55-04:00
testsuite: add test for wasm promise.throwTo() logic

This commit adds a test case to test the wasm backend
promise.throwTo() logic.

- - - - -
afdd3fe7 by Cheng Shao at 2025-03-26T18:01:55-04:00
docs: document the wasm backend promise.throwTo() feature

- - - - -
65dc65dc by sheaf at 2025-03-26T18:02:43-04:00
Refactor CtEvidence into Given/Wanted

This commit is a simple refactoring which splits up the CtEvidence,
giving each constructor its own datatype:

  data CtEvidence
    = CtGiven  GivenCtEvidence
    | CtWanted WantedCtEvidence

  data GivenCtEvidence =
    GivenCt
      { ctev_pred :: TcPredType
      , ctev_evar :: EvVar
      , ctev_loc  :: CtLoc }

  data WantedCtEvidence =
    WantedCt
      { ctev_pred      :: TcPredType
      , ctev_dest      :: TcEvDest
      , ctev_loc       :: CtLoc
      , ctev_rewriters :: RewriterSet }

This enables a few minor simplifications in the code, notably removing
a panic from GHC.Tc.Solver.Solve.solveWantedForAll_implic.

Fixes #25848

- - - - -
ada04031 by sheaf at 2025-03-26T18:03:27-04:00
Export lists: same prio for NoParent & RightParent

This commit ensures that, when we are renaming children in an export
list item such as

  module M ( P(A,B,C) )

we consider children with NoParent to have the same priority as children
which have the correct parent (P in this case). This is because we
should **not** prioritise a data constructor (with the right parent)
over a pattern synonym we are bundling (which, before bundling, has
no parent).

Fixes #25892

- - - - -
721628a0 by Adriaan Leijnse at 2025-03-27T09:10:10-04:00
TTG: Replace HsUnboundVar with HsHole

Context:

The HsUnboundVar constructor in Language.Haskell.Syntax.Expr contained a
RdrName, which stood in the way of the work towards a dedicated
haskell-syntax library. The constructor was overloaded for unbound
variables, anonymous and named holes, and parse errors.

This commit:

Replaces HsUnboundVar with HsHole. In the surface syntax HsHole only
represents an anonymous expression hole ("_"). It is extended with the
XHole type family.

In the concrete GHC implementation of the language on the other hand,
HsHole is used for "any thing which is not necessarily a valid or fully
defined program fragment, but for which a type can be derived". This use
is similar to how HsUnboundVar was used, but the parse error case is now
made explicit with a ParseError case for XHole. This is in anticipation
of future work on a fault tolerant compilation pipeline.

- - - - -
dbd852f5 by Ben Gamari at 2025-03-27T09:10:48-04:00
rel_eng: Finish removal of CentOS jobs

Remove centos7 from release fetch and ghcup metadata generation scripts.

Closes #25893.

- - - - -
0e0231e7 by Matthew Pickering at 2025-03-28T18:36:33-04:00
hadrian: Make hash_unit_ids into a flavour transformer (and enable for release flavour)

The primary reason for this change is to make the `release` flavour
enable `--hash-unit-ids` by default without any further user intervention.

* Packagers don't have to be aware of this special flag they should be
  using.
* release builds on CI are uniformly testing with hashes (see !13418)

Fixes #25379

- - - - -
9fc54c12 by Rodrigo Mesquita at 2025-03-28T18:37:10-04:00
driver: Move DynFlags consistency fixes off Main

These consistency fixes found in Main.hs are required for the proper
functioning of the compiler and should live together with all remaining
fixes in `makeDynFlagsConsistent`.

This is especially relevant to GHC applications that shouldn't have to
copy/fix themselves possibly inconsistent DynFlags.

Additionally, outputs information when verbosity is high about these
consistency fixes that were previously quiet, adds information to the
Note on consistency of DynFlags, and improves one of the fixes that
incorrectly used `dynNow`.

- - - - -
2fdd0be9 by sheaf at 2025-03-28T18:37:53-04:00
Remove GhcHint from TcRnNotInScope constructor

This is a tiny refactoring which:

  - removes GhcHint/ImportError fields from some constructors of
    TcRnMessage, using the TcRnMessageDetailed mechanism instead to
    report this informaiton:
      - removes the GhcHint and ImportErrors fields from TcRnNotInScope
      - removes the GhcHint field from TcRnTermNameInType
  - ensures that we only include these hints and import errors when the
    -fhelpful-errors flag is turned on

Fixes #25874

- - - - -
9e5cd064 by ARATA Mizuki at 2025-03-31T14:53:34-04:00
Better support for SSE3 and SSE4.1

In particular:

* Pass appropriate attributes to LLVM
* Define preprocessor macros for them

- - - - -
c2c7dd51 by ARATA Mizuki at 2025-03-31T14:53:34-04:00
x86: Add support for SSSE3

This commit adds the `-mssse3` flag, which controls usage of SSSE3 instructions in x86 code generation.

- - - - -
d7c62580 by ARATA Mizuki at 2025-03-31T14:53:34-04:00
x86 NCG SIMD: Implement 128-bit integer vector arithmetics

This commit implements the following operations on integer vectors:

* negateIntNXM#
* plus{Int,Word}NXM#
* minus{Int,Word}NXM#
* times{Int,Word}NXM#
* quot{Int,Word}NXM#
* rem{Int,Word}NXM#
* min{Int,Word}NXM#
* max{Int,Word}NXM#

where (N,M) is one of (8,16), (16,8), (32,4), or (64,2).

Closes #25643

- - - - -
f5ea4e7e by ARATA Mizuki at 2025-03-31T14:53:34-04:00
x86 NCG SIMD: Implement 128-bit integer vector shuffle

This commit implements the following operations:

* shuffle{Int,Word}8X16#
* shuffle{Int,Word}16X8#
* shuffle{Int,Word}32X4#
* shuffle{Int,Word}64X2#

See #25643

- - - - -
5eeb6645 by Simon Peyton Jones at 2025-03-31T14:54:16-04:00
Re-jig the way that the Simplifier tries RULES

As #25170 showed, if a new RULE appears, it could change the simplifier's
behaviour a bit, even if it never fires; and that messes up deterministic
compilation.  (This was particularly nasty if the rule wasn't even transitively
below the module being compiled.)

This MR rejigs the use of `tryRules` so that behaviour does not change
when a new, unrelated RULE is added.  It's described in

* Note [When to apply rewrite rules]
* Note [tryRules: plan (BEFORE)]
* Note [tryRules: plan (AFTER)]

The main change is in the refactored version of
  * simplOutId
  * rebuildCall
The little state machine that was embedded in ArgInfo is gone.

As I wandered around the Simplifier I also found opportunities for
some loosely-related refactoring:

* In several places, the /substitution/ in the SimpleEnv is empty;
  all we care about is the in-scope set and the flags.  So
  - I made a synonym `SimplEnvIS` that embodies that invariant,
  - used it in a number of type signatures (notably `rebuild`)
  - added some assertion checks (via `checkSimlEnvIS`)

* I moved the hanlding of `runRW` out of `rebuildCall` (where we
  would have to test repeatedly) and into the new `simplOutId`, which
  fires up `rebuildCall`. Now it is only tested once.

-------------------------
Metric Decrease:
    T9020
    T9961
-------------------------

- - - - -
f534474a by sheaf at 2025-03-31T14:54:59-04:00
Add comment: no qualified Names in the LocalRdrEnv

This commit adds a reference to section 5.5.1 of the Haskell 2010 report,
to explain that qualified names can't occur in the LocalRdrEnv.

Fixes #25875

- - - - -
d5ea80c6 by Patrick at 2025-03-31T14:55:42-04:00
Fix deadlock/loop in interface rehydration (#25858)

In #25858, GHC hangs when processing modules with class defaults due to a
circular dependency in the interface rehydration process. The deadlock/loop
occurred when eager class defaults rehydration accessed not-yet-complete module details.

To fix the immediate deadlock/loop.
`tcIfaceDefaults` is refactored, we use the class name directly from the iface
and use `forM` for lazy loading the class, which algins with the handling of other fields
of ModDetails. This laziness ensure rehydration waits for HomePackageTable (HPT) to
be updated and prevent premature evaluation of ModDetails inside `fixIO``.

As suggested by Matthew, class defaults importing is also refactored
to align with the compiler's established interface loading conventions.
- add class defaults field to ExternalPackageState (EPS).
- rehydrate and store class defaults in EPS at `loadInterface`.
- Instead of using `tcIfaceDefaults` in `tcRnImports`, we add and use
  `tcGetClsDefaults` to read defaults directly from HPT or EPS
  when importing modules.

Tests:
- T25858, T25858v1-2: Test class hydration in defaults
- T25858v3-4: Test type list hydration in defaults

New Note [Tricky rehydrating IfaceDefaults loop] is added.

Thanks to @sheaf (Sam), @mpickering (Matthew), and @simonpj (Simon) for their
valuable input and analysis.

Fixes #25858.

- - - - -
2d419d8d by Matthew Pickering at 2025-04-02T16:12:36-04:00
Use unsafePerformIO in definition of computeFingerprint

computeFingerprint is morally a pure function, which is implemented by
mutating a buffer. Using unsafePerformIO inside the definition allows it
to be used in pure contexts, fixing one place where an ad-hoc call to
unsafePerformIO is already needed.

- - - - -
ccdf979b by Matthew Pickering at 2025-04-02T16:12:37-04:00
driver: Fix recompilation checking for exported defaults

Since the exported defaults are not associated with any identifier from
the module, they are just added to the export hash rather than
the fine-grained recompilation logic.

Fixes #25855

- - - - -
c5bf9892 by Matthew Pickering at 2025-04-02T16:12:37-04:00
driver: Fix recompilation checking for COMPLETE pragmas

A {-# COMPLETE P, Q #-} pragma is associated with the pattern synonyms P
and Q during recompilation checking. Therefore, the existence of a
pattern synonym becomes part of the ABI hash for P and Q.

Then if a module uses these pattern synonyms and a complete pragma
changes, it will trigger recompilation in that module.

Fixes #25854

- - - - -
d0fd9370 by sheaf at 2025-04-02T16:14:05-04:00
Handle named default exports separately

This commit changes the way we check for duplicate exports of named
default declarations. They are now treated entirely separately from
other exports, because in an export list of the form

  module M ( default Cls, Cls )

the default declaration does not export the class 'Cls', but only its
default declarations.

Also fixes a bug in Backpack where named default exports were getting
dropped entirely. No test for that.

Fixes #25857

- - - - -
62d04494 by Cheng Shao at 2025-04-03T05:56:17-04:00
ci: add x86_64-linux-ubuntu24_04 nightly/release jobs

- - - - -
327952e4 by Cheng Shao at 2025-04-03T05:56:17-04:00
rel-eng: add ubuntu24_04 bindists to ghcup metadata and fetch gitlab scripts

- - - - -
aa1e3b8b by sheaf at 2025-04-03T05:57:24-04:00
GHC settings: always unescape escaped spaces

In #25204, it was noted that GHC didn't properly deal with having
spaces in its executable path, as it would compute an invalid path
for the C compiler.

The original fix in 31bf85ee49fe2ca0b17eaee0774e395f017a9373 used a
trick: escape spaces before splitting up flags into a list. This fixed
the behaviour with extra flags (e.g. -I), but forgot to also unescape
for non-flags, e.g. for an executable path (such as the C compiler).

This commit rectifies this oversight by consistently unescaping the
spaces that were introduced in order to split up argument lists.

Fixes #25204

- - - - -
34a9b55d by lazyLambda at 2025-04-04T06:22:26-04:00
Driver: make MonadComprehensions imply ParallelListComp

This commit changes GHC.Driver.Flags.impliedXFlags to make the
MonadComprehensions extension enable the ParallelListComp extension.

Fixes #25645

- - - - -
d99eb7cd by sheaf at 2025-04-04T06:23:28-04:00
NamedDefaults: handle poly-kinded unary classes

With this commit, we accept named default declarations for poly-kinded
classes such as Typeable, e.g.

  default Typeable (Char)

This used to fail because we assumed the kind of the class was monomorphic,
e.g.

  Type -> Constraint
  (Type -> Type) -> Constraint
  Nat -> Constraint

Now, we can handle a simple polymorphic class such as

  Typeable :: forall k. k -> Constraint

Note that we keep the restriction that the class must only have
one visible argument.

This is all explained in the new Note [Instance check for default declarations]
in GHC.Tc.Gen.Default.

Fixes #25882

- - - - -
4cbc90de by sheaf at 2025-04-04T11:39:05-04:00
LLVM: add type annotations to AtomicFetch_cmm.cmm

- - - - -
e2237305 by sheaf at 2025-04-04T11:39:05-04:00
Cmm lint: lint argument types of CallishMachOps

This commit adds a new check to Cmm lint to ensure that the argument
types to a CallishMachOp are correct. The lack of this check was
detected in the AtomicFetch test: the literals being passed as the
second arguments to operations such as 'fetch_add', 'fetch_and'... were
of the wrong width, which tripped up the LLVM backend.

- - - - -
9363e547 by Cheng Shao at 2025-04-04T11:39:50-04:00
ci: add ghc-wasm-meta integration testing jobs

This patch adds ghc-wasm-meta integration testing jobs to the CI
pipeline, which are only triggered via the `test-wasm` MR label or
manually when the `wasm` label is set.

These jobs will fetch the wasm bindists and test them against a
variety of downstream projects, similarly to head.hackage jobs for
native bindists, offering a convenient way to catch potential
downstream breakage while refactoring the wasm backend.

- - - - -
27029e60 by Adam Gundry at 2025-04-04T11:40:36-04:00
base: Minor fixes to GHC.Records haddocks

This corrects a stale reference to OverloadedRecordFields (which should
be OverloadedRecordDot), fixes the haddock link syntax and adds an
@since pragma.

- - - - -
f827c4c6 by Rodrigo Mesquita at 2025-04-07T11:22:10-04:00
Parametrize default logger action with Handles

Introduce `defaultLogActionWithHandles` to allow GHC applications to use
GHC's formatting but using custom handles.

`defaultLogAction` is then trivially reimplemented as
```
defaultLogActionWithHandles stdout stderr
```

- - - - -
5dade5fd by sheaf at 2025-04-07T11:23:02-04:00
Finer-grained recompilation checking for exports

This commit refines the recompilation checking logic, to avoid
recompiling modules with an explicit import list when the modules they
import start exporting new items.

More specifically, when:

  1. module N imports module M,
  2. M is changed, but in a way that:
      a. preserves the exports that N imports
      b. does not introduce anything that forces recompilation downstream,
         such as orphan instances

then we no longer require recompilation of N.

Note that there is more to (2a) as initially meets the eye:

  - if N includes a whole module or "import hiding" import of M,
    then we require that the export list of M does not change,
  - if N only includes explicit imports, we check that the imported
    items don't change, e.g.

      - if we have @import M(T(K, f), g)@, we must check that N
        continues to export all these identifiers, with the same Avail
        structure (i.e. we should error if N stops bundling K or f with
        T)
      - if we have @import M(T(..))@, we must check that the children
        of T have not changed

See Note [When to recompile when export lists change?] in GHC.Iface.Recomp.

This is all tested in the new tests RecompExports{1,2,3,4,5}

Fixes #25881

- - - - -
f32d6c2b by Andreas Klebinger at 2025-04-07T22:01:25-04:00
NCG: AArch64 - Add -finter-module-far-jumps.

When enabled the arm backend will assume jumps to targets outside of the
current module are further than 128MB away.

This will allow for code to work if:
* The current module results in less than 128MB of code.
* The whole program is loaded within a 4GB memory region.

We have seen a few reports of broken linkers (#24648) where this flag might allow
a program to compile/run successfully at a very small performance cost.

-------------------------
Metric Increase:
    T783
-------------------------

- - - - -
553c280b by Andreas Klebinger at 2025-04-07T22:02:11-04:00
Revert "rts: fix small argument passing on big-endian arch (fix #23387)"

Based on analysis documented in #25791 this doesn't fully fix the big
while introducing new bugs on little endian architectures.

A more complete fix will have to be implemented to fix #23387

This reverts commit 4f02d3c1a7b707e609bb3aea1dc6324fa19a5c39.

- - - - -
b0dc6599 by Andreas Klebinger at 2025-04-07T22:02:11-04:00
Interpreter: Fixes to handling of subword value reads/writes.

Load subword values as full words from the stack truncating/expanding as
neccesary when dealing with subwords. This way byte order is implicitly
correct.

This commit also fixes the order in which we are pushing literals onto
the stack on big endian archs.

Last but not least we enable a test for ghci which actually tests these
subword operations.

- - - - -
ed38c09b by Cheng Shao at 2025-04-07T22:02:53-04:00
testsuite: don't test WasmControlFlow stdout

This patch solves a potential test flakiness in `WasmControlFlow` by
removing `WasmControlFlow.stdout` which is not so portable/stable as
it seems. See added `Note [WasmControlFlow]` for more detailed
explanation.

- - - - -
f807c590 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
debugger: Add docs to obtainTermFromId

- - - - -
5dba052d by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
Move logic to find and set Breakpoint to GHC

Breakpoints are uniquely identified by a module and an index unique
within that module. `ModBreaks` of a Module contains arrays mapping from
this unique breakpoint index to information about each breakpoint. For
instance, `modBreaks_locs` stores the `SrcSpan` for each breakpoint.

To find a breakpoint using the line number you need to go through all
breakpoints in the array for a given module and look at the line and
column stored in the `SrcSpan`s. Similarly for columns and finding
breakpoints by name.

This logic previously lived within the `GHCi` application sources,
however, it is common to any GHC applications wanting to set
breakpoints, like the upcoming `ghc-debugger`.

This commit moves this logic for finding and setting breakpoints to the
GHC library so it can be used by both `ghci` and `ghc-debugger`.

- - - - -
bc0b9f73 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
Refactor and move logic for identifier breakpoints

Breakpoints can be set on functions using syntax of the form
`[Module.]function`. The parsing, resolution (e.g. inferring implicit
module), and validation of this syntax for referring to functions was
tightly coupled with its GHCi use.

This commit extracts the general purpose bits of resolving this syntax
into `GHC.Runtime.Debugger.Breakpoints` so it can be further used by
other GHC applications and to improve the code structure of GHCi.

Moreover, a few utilities that do splitting and joining of identifiers
as strings were moved to `GHC.Runtime.Eval.Utils`, which also can be
used in the future to clean up `GHC.Runtime.Eval` a bit.

- - - - -
4f728d21 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
debugger: derive Ord for BreakpointIds

- - - - -
5528771c by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
debugger: Move context utils from GHCi to GHC

Moves `enclosingTickSpan`, `getCurrentBreakSpan`, and
`getCurrentBreakModule`, general utilities on the internal debugger
state, into the GHC library.

- - - - -
4871f543 by sheaf at 2025-04-08T17:42:43-04:00
Implicit quantification in type synonyms: add test

This adds a test for ticket #24090, which involves implicit
quantification in type synonyms.
The underlying issue was fixed in 0d4ee209dfe53e5074d786487f531dabc36d561c.

- - - - -
48917d3c by sheaf at 2025-04-08T17:42:44-04:00
Turn on implicit-rhs-quantification by default

This flag was added to GHC 9.8, and will be removed in a future GHC
release. In preparation, this commit adds it to the default warning
flags.

- - - - -
629be068 by Rodrigo Mesquita at 2025-04-08T17:43:26-04:00
debugger: Add breakpoints to every Stmt

While single-stepping through a Haskell program we stop at every
breakpoint. However, we don't introduce breakpoints at every single
expression (e.g. single variables) because they would be too many and
uninteresting.

That said, in a do-block, it is expected that stepping over would break
at every line, even if it isn't particularly interesting (e.g. a single
arg like getArgs). Moreover, let-statements in do-blocks, despite only
being evaluated once needed, lead to surprising jumps while stepping
through because some have outermost (outside the let) breakpoints
while others don't.

This commit makes every statement in a do-block have a breakpoint.
This leads to predictable stepping through in a do-block.
Duplicate breakpoints in the same location are avoided using the
existing blacklist mechanism, which was missing a check in one relevant place.

Fixes #25932

- - - - -
99a3affd by Matthew Pickering at 2025-04-08T17:44:08-04:00
driver: refactor: Split downsweep and MakeAction into separate modules.

This will facilitate using the downsweep functions in other parts of
the compiler than just --make mode.

Also, the GHC.Driver.Make module was huge. Now it's still huge but
slightly smaller!

- - - - -
ecfec4df by sheaf at 2025-04-09T14:13:12-04:00
Store user-written qualification in the GhcRn AST

This commit ensures we store the original user-written module
qualification in the renamed AST. This allows us to take into account
the user-written qualification in error messages.

Fixes #25877

- - - - -
97c884e2 by sheaf at 2025-04-09T14:13:12-04:00
TcRnIllegalTermLevelUse: simpler error when possible

This commit makes GHC emit a simple error message in the case of an
illegal term-level use of a data constructor: we will try to report an
out-of-scope error instead of a "Illegal term level use" error, as the
latter might be a bit overwhelming for newcomers.

We do this when we have a data constructor import suggestion to provide
to the user. For example:

  module M where { data A = A }

  module N where
    import M(A)

    x = Bool
    -- Illegal term-level use of Bool

    y = A
    -- Data constructor not in scope: A.
    -- Perhaps add 'A' to the import list of 'M'.

This commit also revamps the "similar names" suggestion mechanism,
and in particular its treatment of name spaces. Now, which name spaces
we suggest is based solely on what we are looking for, and no longer on
the NameSpace of the Name we have. This is because, for illegal term-level
use errors, it doesn't make much sense to change the suggestions based
on the fact that we resolved to e.g. a type constructor/class; what
matters is what we were expecting to see in this position.
See GHC.Rename.Unbound.{suggestionIsRelevant,relevantNameSpace} as well
as the new constructors to GHC.Tc.Errors.Types.WhatLooking.

Fixes #23982

- - - - -
bff645ab by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00
driver: Split Session functions out of Main

This commit moves out functions that help in creating and validating a
GHC multi session from Main into the ghc library where they can be used by
other GHC applications.

Moreover, `Mode` processing and `checkOptions` linting were moved to
separate modules within the ghc-bin executable package.

In particular:

- Move `Mode` types and functions (referring to the mode GHC is running
  on) to `ghc-bin:GHC.Driver.Session.Mode`

- Move `checkOptions` and aux functions, which validates GHC DynFlags
  based on the mode, to `ghc-bin:GHC.Driver.Session.Lint`

- Moves `initMulti`, `initMake`, and aux functions, which initializes a make/multi-unit
  session, into `ghc:GHC.Driver.Session.Units`.

- - - - -
501b015e by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00
docs: Improve haddock of ExecComplete

- - - - -
dea98988 by Andreas Klebinger at 2025-04-09T19:23:57-04:00
Avoid oversaturing constructor workers.

Constructor applications always need to take the exact number of
arguments. If we can't ensure that instead apply the constructor worker
like a regular function.

Fixes #23865

- - - - -
f1acdd2c by sheaf at 2025-04-09T19:25:41-04:00
NamedDefaults: require the class to be standard

We now only default type variables if they only appear in constraints
of the form `C v`, where `C` is either a standard class or a class with
an in-scope default declaration.

This rectifies an oversight in the original implementation of the
NamedDefault extensions that was remarked in #25775; that implementation
allowed type variables to appear in unary constraints which had arbitrary
classes at the head.

See the rewritten Note [How type-class constraints are defaulted] for
details of the implementation.

Fixes #25775
Fixes #25778

- - - - -
5712e0d6 by Vladislav Zavialov at 2025-04-10T05:17:38+00:00
Retry type/class declarations and instances (#12088)

Retry type/class declarations and instances to account for non-lexical
dependencies arising from type/data family instances.

This patch improves the kind checker's ability to use type instances in kind
checking of other declarations in the same module.

* Key change: tcTyAndClassDecls now does multiple passes over the TyClGroups,
  as long as it is able to make progress.
  See the new Note [Retrying TyClGroups] in GHC.Tc.TyCl

* Supporting change: FVs of a TyClGroup are now recorded in its extension
  field, namely XCTyClGroup.
  See the new Note [Prepare TyClGroup FVs] in GHC.Rename.Module

* Instances are no longer inserted at the earliest positions where their FVs
  are bound. This is a simplification.
  See the new Note [Put instances at the end] in GHC.Rename.Module

* Automatic unpacking is now more predictable, but fewer fields get unpacked
  by default. Use explicit {-# UNPACK #-} pragmas instead.
  See the new Note [Flaky -funbox-strict-fields with type/data families]

For the wide range of newly accepted programs, consult the added test cases.

Fixed tickets:
    #12088, #12239, #14668, #15561, #16410, #16448, #16693,
    #19611, #20875, #21172, #22257, #25238, #25834

Metric Decrease:
    T8095

- - - - -
bc73a78d by sheaf at 2025-04-10T15:07:24-04:00
checkFamApp: don't be so eager to cycle break

As remarked in #25933, a pure refactoring of checkTyEqRhs in
ab77fc8c7adebd610aa0bd99d653f9a6cc78a374 inadvertently changed behaviour,
as it caused GHC to introduce cycle-breaker variables in some
unnecessary circumstances.

This commit refactors 'GHC.Tc.Utils.Unify.checkFamApp' in a way that
should restore the old behaviour, so that, when possible, we first
recur into the arguments and only introduce a cycle breaker if this
recursion fails (e.g. due to an occurs check failure).

Fixes #25933

- - - - -
3acd8182 by Andreas Klebinger at 2025-04-10T22:32:12-04:00
Expand docs for RTS flag `-M`.

The behaviour of how/when exceptions are raised was not really covered
in the docs.

- - - - -
026c1a39 by Adam Sandberg Ericsson at 2025-04-10T22:32:56-04:00
add cases for more SchedulerStatus codes in rts_checkSchedStatus
- - - - -
5977c6a1 by sheaf at 2025-04-10T22:33:46-04:00
Squash warnings in GHC.Runtime.Heap.Inspect

There were incomplete record selector warnings in GHC.Runtime.Heap.Inspect
due to the use of the partial 'dataArgs' record selector. This is fixed
by passing the fields to the 'extractSubTerms' function directly,
rather than passing a value of the parent data type.

- - - - -
6a3e38f5 by Andreas Klebinger at 2025-04-11T15:13:53-04:00
hadrian: Make ghcWithInterpreter the universal source of truth about availability of the interpreter

We were doing some ad-hoc checks in different places in hadrian to
determine whether we supported the interprter or not. Now this check if
confined to one function, `ghcWithInterpreter`, and all the places which
use this information consult `ghcWithInterpreter` to determine what to
do.

Fixes #25533.

- - - - -
207de6f1 by Matthew Pickering at 2025-04-11T15:14:37-04:00
testsuite: Fix running TH tests with profiled dynamic compiler

Previously, I had failed to update the ghc_th_way_flags logic for the
profiled dynamic compiler.

In addition to this `ghc_dynamic` was incorrectly set for profiled
dynamic compiler.

I also updated MultiLayerModulesTH_OneShot test to work for any compiler
linkage rather than just dynamic.

Fixes #25947

-------------------------
Metric Decrease:
    MultiLayerModulesTH_Make
-------------------------

- - - - -
5455f2b9 by Matthew Pickering at 2025-04-12T08:31:36-04:00
driver: Add support for "Fixed" nodes in the ModuleGraph

A fixed node in the module graph is one which we presume is already
built. It's therefore up to the user to make sure that the interface
file and any relevant artifacts are available for a fixed node.

Fixed/Compile nodes are represented by the ModuleNodeInfo type, which
abstracts the common parts of Fixed/Compile nodes with accessor
functions of type `ModuleNodeInfo -> ...`.

Fixed nodes can only depend on other fixed nodes. This invariant can be
checked by the function `checkModuleGraph` or `mkModuleGraphChecked`.

--make mode is modified to work with fixed mode. In order to "compile" a
fixed node, the artifacts are just loaded into the HomePackageTable.
Currently nothing in the compiler will produce Fixed nodes but this is
tested with the FixedNodes GHC API test.

In subsequent patches we are going to remove the ExternalModuleGraph and
use Fixed nodes for modules in the module graph in oneshot mode.

Fixes #25920

- - - - -
ad64d5c2 by Cheng Shao at 2025-04-12T08:32:19-04:00
ci: remove manual case of ghc-wasm-meta downstream testing jobs

This patch removes the manual case of ghc-wasm-meta downstream testing
jobs; now the only way of including them in the pipeline and running
them is via the test-wasm label.

The reason of the removal is it proves to be problematic for MRs with
only the wasm label; the wasm job would succeed, then the pipeline
status would be waiting for manual action instead of succeeding. There
needs to be separate jobs for the label-triggered and manual-triggered
cases, but I don't think it's worth that extra complexity, the
label-triggered case is already sufficient.

- - - - -
b34890c7 by Vladislav Zavialov at 2025-04-13T01:08:21+03:00
Fix EmptyCase panic in tcMatches (#25960)

Due to faulty reasoning in Note [Pattern types for EmptyCase],
tcMatches was too keen to panic.

* Old (incorrect) assumption: pat_tys is a singleton list.
  This does not hold when \case{} is checked against a function type
  preceded by invisible forall. See the new T25960 test case.

* New (hopefully correct) assumption: vis_pat_tys is a singleton list.
  This should follow from:

    checkArgCounts :: MatchGroup GhcRn ... -> TcM VisArity
    checkArgCounts (MG { mg_alts = L _ [] })
      = return 1
    ...

- - - - -
84806ebc by Vladislav Zavialov at 2025-04-13T11:40:08-04:00
Remove unused type: TokenLocation

- - - - -
05eb50df by Vladislav Zavialov at 2025-04-13T19:16:38-04:00
Register EpToken in Parser.PostProcess.Haddock (#22558)

This change allows us to reject more badly placed Haddock comments.
Examples:

  module
    -- | Bad comment for the module
    T17544_kw where

  data Foo -- | Bad comment for MkFoo
    where MkFoo :: Foo

  newtype Bar -- | Bad comment for MkBar
    where MkBar :: () -> Bar

  class Cls a
      -- | Bad comment for clsmethod
    where
      clsmethod :: a

- - - - -
01944e5e by Vladislav Zavialov at 2025-04-13T19:17:21-04:00
Reject puns in T2T (#24153)

This patch implements pun detection in T2T. Consider:

  x = 42
  f, g :: forall a -> ...
  f (type x) = g x

In accordance with the specification, the `g x` function call is renamed
as a term, so `x` refers to the top-level binding `x = 42`, not to the
type variable binding `type x` as one might expect.

This is somewhat counterintuitive because `g` expects a type argument.
Forbidding puns in T2T allows us to produce a helpful error message:

  Test.hs:5:16: error: [GHC-09591]
    Illegal punned variable occurrence in a required type argument.
    The name ‘x’ could refer to:
      ‘x’ defined at Test.hs:3:1
      ‘x’ bound at Test.hs:5:9

This commit is a follow up to 0dfb1fa799af254c8a1e1045fc3996af2d57a613
where checking for puns was left as future work.

- - - - -
cc580552 by Vladislav Zavialov at 2025-04-13T19:18:02-04:00
Additional test cases for #12088, #13790

Extract more test cases from ticket discussions, including multi-module
examples. Follow up to 5712e0d646f611dfbfedfd7ef6dff3a18c016edb

- - - - -
d47bf776 by Matthew Pickering at 2025-04-14T16:44:41+01:00
driver: Use ModuleGraph for oneshot and --make mode

This patch uses the `hsc_mod_graph` field for both oneshot and --make
mode. Therefore, if part of the compiler requires usage of the module
graph, you do so in a uniform way for the two different modes.

The `ModuleGraph` describes the relationship between the modules in the
home package and units in external packages. The `ModuleGraph` can be
queried when information about the transitive closure of a package is
needed. For example, the primary use of the ModuleGraph from within the
compiler is in the loader, which needs to know the transitive closure of
a module so it can load all the relevant objects for evaluation.

In --make mode, downsweep computes the ModuleGraph before any
compilation starts.

In oneshot mode, a thunk is created at the start of compilation, which
when forced will compute the module graph beneath the current module.
The thunk is only forced at the moment when the user uses Template
Haskell.

Finally, there are some situations where we need to discover what
dependencies to load but haven't loaded a module graph at all. In this
case, there is a fallback which computes the transitive closure on the
fly and doesn't cache the result. Presumably if you are going to call
getLinkDeps a lot, you would compute the right ModuleGraph before you
started.

Importantly, this removes the ExternalModuleGraph abstraction. This was quite
awkward to work with since it stored information about the home package
inside the EPS.

This patch will also be very useful when implementing explicit level
imports, which requires more significant use of the module graph in
order to determine which level instances are available at.

Towards #25795

-------------------------
Metric Decrease:
    MultiLayerModulesTH_Make
    MultiLayerModulesTH_OneShot
-------------------------

- - - - -
395e0ad1 by sheaf at 2025-04-16T12:33:26-04:00
base: remove .Internal modules (e.g. GHC.TypeLits)

This commit removes the following internal modules from base,
as per CLC proposal 217:

  - GHC.TypeNats.Internal
  - GHC.TypeLits.Internal
  - GHC.ExecutionStack.Internal

Fixes #25007

- - - - -
e0f3ff11 by Patrick at 2025-04-17T04:31:12-04:00
Refactor Handling of Multiple Default Declarations

Fixes: #25912, #25914, #25934

Previously, GHC discarded all loaded defaults (tcg_default) when local
defaults were encountered during typechecking. According to the
exportable-named-default proposal (sections 2.4.2 and 2.4.3), local
defaults should be merged into tcg_default, retaining any defaults
already present while overriding where necessary.

Key Changes:

* Introduce DefaultProvenance to track the origin of default declarations
  (local, imported, or built-in), replacing the original cd_module
  in ClassDefaults with cd_provenance :: DefaultProvenance.
* Rename tcDefaults to tcDefaultDecls, limiting its responsibility to only
  converting renamed class defaults into ClassDefaults.
* Add extendDefaultEnvWithLocalDefaults to merge local defaults into the
  environment, with proper duplication checks:
  - Duplicate local defaults for a class trigger an error.
  - Local defaults override imported or built-in defaults.
* Update and add related notes: Note [Builtin class defaults],
  Note [DefaultProvenance].
* Add regression tests: T25912, T25914, T25934.

Thanks sam and simon for the help on this patch.
Co-authored-by: sheaf <sam.derbyshire@gmail.com>

- - - - -
386f1854 by Teo Camarasu at 2025-04-17T04:31:55-04:00
template-haskell: Remove `addrToByteArrayName` and `addrToByteArray`

These were part of the implementation of the `Lift ByteArray` instance and were errornously exported because this module lacked an explicit export list. They have no usages on Hackage.

Resolves #24782

- - - - -
b96e2f77 by Sylvain Henry at 2025-04-18T20:46:33-04:00
RTS: remove target info and fix host info (#24058)

The RTS isn't a compiler, hence it doesn't have a target and we remove
the reported target info displayed by "+RTS --info". We also fix the
host info displayed by "+RTS --info": the host of the RTS is the
RTS-building compiler's target, not the compiler's host (wrong when
doing cross-compilation).

- - - - -
6d9965f4 by Sylvain Henry at 2025-04-18T20:46:33-04:00
RTS: remove build info

As per the discussion in !13967, there is no reason to tag the RTS with
information about the build platform.

- - - - -
d52e9b3f by Vladislav Zavialov at 2025-04-18T20:47:15-04:00
Diagnostics: remove the KindMismatch constructor (#25957)

The KindMismatch constructor was only used as an intermediate
representation in pretty-printing.

Its removal addresses a problem detected by the "codes" test case:

  [GHC-89223] is untested (constructor = KindMismatch)

In a concious deviation from the usual procedure, the error code
GHC-89223 is removed entirely rather than marked as Outdated.
The reason is that it never was user-facing in the first place.

- - - - -
e2f2f9d0 by Vladislav Zavialov at 2025-04-20T10:53:39-04:00
Add name for -Wunusable-unpack-pragmas

This warning had no name or flag and was triggered unconditionally.
Now it is part of -Wdefault.

In GHC.Tc.TyCl.tcTyClGroupsPass's strict mode, we now have to
force-enable this warning to ensure that detection of flawed groups
continues to work even if the user disables the warning with the
-Wno-unusable-unpack-pragmas option. Test case: T3990c

Also, the misnamed BackpackUnpackAbstractType is now called
UnusableUnpackPragma.

- - - - -
6caa6508 by Adam Gundry at 2025-04-20T10:54:22-04:00
Fix specialisation of incoherent instances (fixes #25883)

GHC normally assumes that class constraints are canonical, meaning that
the specialiser is allowed to replace one dictionary argument with another
provided that they have the same type.  The `-fno-specialise-incoherents`
flag alters INCOHERENT instance definitions so that they will prevent
specialisation in some cases, by inserting `nospec`.

This commit fixes a bug in 7124e4ad76d98f1fc246ada4fd7bf64413ff2f2e, which
treated some INCOHERENT instance matches as if `-fno-specialise-incoherents`
was in effect, thereby unnecessarily preventing specialisation. In addition
it updates the relevant `Note [Rules for instance lookup]` and adds a new
`Note [Canonicity for incoherent matches]`.

- - - - -
0426fd6c by Adam Gundry at 2025-04-20T10:54:23-04:00
Add regression test for #23429

- - - - -
eec96527 by Adam Gundry at 2025-04-20T10:54:23-04:00
user's guide: update specification of overlapping/incoherent instances

The description of the instance resolution algorithm in the user's
guide was slightly out of date, because it mentioned in-scope given
constraints only at the end, whereas the implementation checks for
their presence before any of the other steps.

This also adds a warning to the user's guide about the impact of
incoherent instances on specialisation, and more clearly documents
some of the other effects of `-XIncoherentInstances`.

- - - - -
a00eeaec by Matthew Craven at 2025-04-20T10:55:03-04:00
Fix bytecode generation for `tagToEnum# <LITERAL>`

Fixes #25975.

- - - - -
2e204269 by Andreas Klebinger at 2025-04-22T12:20:41+02:00
Simplifier: Constant fold invald tagToEnum# calls to bottom expr.

When applying tagToEnum# to a out-of-range value it's best to simply
constant fold it to a bottom expression. That potentially allows more
dead code elimination and makes debugging easier.

Fixes #25976

- - - - -
7250fc0c by Matthew Pickering at 2025-04-22T16:24:04-04:00
Move -fno-code note into Downsweep module

This note was left behind when all the code which referred to it was
moved into the GHC.Driver.Downsweep module

- - - - -
d2dc89b4 by Matthew Pickering at 2025-04-22T16:24:04-04:00
Apply editing notes to Note [-fno-code mode] suggested by sheaf

These notes were suggested in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14241

- - - - -
91564daf by Matthew Pickering at 2025-04-24T00:29:02-04:00
ghci: Use loadInterfaceForModule rather than loadSrcInterface in mkTopLevEnv

loadSrcInterface takes a user given `ModuleName` and resolves it to the
module which needs to be loaded (taking into account module
renaming/visibility etc).

loadInterfaceForModule takes a specific module and loads it.

The modules in `ImpDeclSpec` have already been resolved to the actual
module to get the information from during renaming. Therefore we just
need to fetch the precise interface from disk (and not attempt to rename
it again).

Fixes #25951

- - - - -
2e0c07ab by Simon Peyton Jones at 2025-04-24T00:29:43-04:00
Test for #23298

- - - - -
0eef99b0 by Sven Tennie at 2025-04-24T07:34:36-04:00
RV64: Introduce J instruction (non-local jumps) and don't deallocate stack slots for J_TBL (#25738)

J_TBL result in local jumps, there should not deallocate stack slots
(see Note [extra spill slots].)

J is for non-local jumps, these may need to deallocate stack slots.

- - - - -
1bd3d13e by fendor at 2025-04-24T07:35:17-04:00
Add `UnitId` to `EvalBreakpoint`

The `EvalBreakpoint` is used to communicate that a breakpoint was
encountered during code evaluation.
This `EvalBreakpoint` needs to be converted to an `InternalBreakpointId`
which stores a `Module` to uniquely find the correct `Module` in the
Home Package Table.

The `EvalBreakpoint` used to store only a `ModuleName` which is then
converted to a `Module` based on the currently active home unit.
This is incorrect in the face of multiple home units, the break point
could be in an entirely other home unit!
To fix this, we additionally store the `UnitId` of the `Module` in
`EvalBreakpoint` to later reconstruct the correct `Module`

All of the changes are the consequence of extending `EvalBreakpoint`
with the additional `ShortByteString` of the `UnitId`.

For performance reasons, we store the `ShortByteString` backing the
`UnitId` directly, avoiding marshalling overhead.

- - - - -
fe6ed8d9 by Sylvain Henry at 2025-04-24T18:04:12-04:00
Doc: add doc for JS interruptible calling convention (#24444)

- - - - -
6111c5e4 by Ben Gamari at 2025-04-24T18:04:53-04:00
compiler: Ensure that Panic.Plain.assertPanic' provides callstack

In 36cddd2ce1a3bc62ea8a1307d8bc6006d54109cf @alt-romes removed CallStack
output from `GHC.Utils.Panic.Plain.assertPanic'`. While this output is
redundant due to the exception backtrace proposal, we may be
bootstrapping with a compiler which does not yet include this machinery.
Reintroduce the output for now.

Fixes #25898.

- - - - -
217caad1 by Matthew Pickering at 2025-04-25T18:58:42+01:00
Implement Explicit Level Imports for Template Haskell

This commit introduces the `ExplicitLevelImports` and
`ImplicitStagePersistence` language extensions as proposed in GHC
Proposal #682.

Key Features
------------

- `ExplicitLevelImports` adds two new import modifiers - `splice` and
  `quote` - allowing precise control over the level at which imported
  identifiers are available
- `ImplicitStagePersistence` (enabled by default) preserves existing
  path-based cross-stage persistence behavior
- `NoImplicitStagePersistence` disables implicit cross-stage
  persistence, requiring explicit level imports

Benefits
--------

- Improved compilation performance by reducing unnecessary code generation
- Enhanced IDE experience with faster feedback in `-fno-code` mode
- Better dependency tracking by distinguishing compile-time and runtime dependencies
- Foundation for future cross-compilation improvements

This implementation enables the separation of modules needed at
compile-time from those needed at runtime, allowing for more efficient
compilation pipelines and clearer code organization in projects using
Template Haskell.

Implementation Notes
--------------------

The level which a name is availble at is stored in the 'GRE', in the normal
GlobalRdrEnv. The function `greLevels` returns the levels which a specific GRE
is imported at. The level information for a 'Name' is computed by `getCurrentAndBindLevel`.
The level validity is checked by `checkCrossLevelLifting`.

Instances are checked by `checkWellLevelledDFun`, which computes the level an
instance by calling `checkWellLevelledInstanceWhat`, which sees what is
available at by looking at the module graph.

Modifications to downsweep
--------------------------

Code generation is now only enabled for modules which are needed at
compile time.
See the Note [-fno-code mode] for more information.

Uniform error messages for level errors
---------------------------------------

All error messages to do with levels are now reported uniformly using
the `TcRnBadlyStaged` constructor.

Error messages are uniformly reported in terms of levels.

0 - top-level
1 - quote level
-1 - splice level

The only level hard-coded into the compiler is the top-level in
GHC.Types.ThLevelIndex.topLevelIndex.

Uniformly refer to levels and stages
------------------------------------

There was much confusion about levels vs stages in the compiler.
A level is a semantic concept, used by the typechecker to ensure a
program can be evaluated in a well-staged manner.

A stage is an operational construct, program evaluation proceeds in
stages.

Deprecate -Wbadly-staged-types
------------------------------

`-Wbadly-staged-types` is deprecated in favour of `-Wbadly-levelled-types`.

Lift derivation changed
-----------------------

Derived lift instances will now not generate code with expression
quotations.

Before:

```
data A = A Int deriving Lift

=>
lift (A x) = [| A $(lift x) |]
```

After:

```
lift (A x) = conE 'A `appE` (lift x)
```

This is because if you attempt to derive `Lift` in a module where
`NoImplicitStagePersistence` is enabled, you would get an infinite loop
where a constructor was attempted to be persisted using the instance you
are currently defining.

GHC API Changes
---------------

The ModuleGraph now contains additional information about the type of
the edges (normal, quote or splice) between modules. This is abstracted
using the `ModuleGraphEdge` data type.

Fixes #25828

-------------------------
Metric Increase:
    MultiLayerModulesTH_Make
-------------------------

- - - - -
7641a74a by Simon Peyton Jones at 2025-04-26T22:05:19-04:00
Get a decent MatchContext for pattern synonym bindings

In particular when we have a pattern binding
    K p1 .. pn = rhs
where K is a pattern synonym.  (It might be nested.)

This small MR fixes #25995.  It's a tiny fix, to an error message,
removing an always-dubious `unkSkol`.

The bug report was in the context of horde-ad, a big program,
and I didn't manage to make a small repro case quickly. I decided
not to bother further.

- - - - -
ce616f49 by Simon Peyton Jones at 2025-04-27T21:10:25+01:00
Fix infelicities in the Specialiser

On the way to #23109 (unary classes) I discovered some infelicities
(or maybe tiny bugs, I forget) in the type-class specialiser.

I also tripped over #25965, an outright bug in the rule matcher

Specifically:

* Refactor: I enhanced `wantCallsFor`, whih previously always said
`True`, to discard calls of class-ops, data constructors etc.  This is
a bit more efficient; and it means we don't need to worry about
filtering them out later.

* Fix: I tidied up some tricky logic that eliminated redundant
  specialisations.  It wasn't working correctly.  See the expanded
  Note [Specialisations already covered], and
  (MP3) in Note [Specialising polymorphic dictionaries].

  See also the new top-level `alreadyCovered`
  function, which now goes via `GHC.Core.Rules.ruleLhsIsMoreSpecific`

  I also added a useful Note [The (CI-KEY) invariant]

* Fix #25965: fixed a tricky bug in the `go_fam_fam` in
  `GHC.Core.Unify.uVarOrFam`, which allows matching to succeed
  without binding all type varibles.

  I enhanced Note [Apartness and type families] some more

* #25703. This ticket "just works" with -fpolymorphic-specialisation;
  but I was surprised that it worked! In this MR I added documentation
  to Note [Interesting dictionary arguments] to explain; and tests to
  ensure it stays fixed.

- - - - -
22d11fa8 by Simon Peyton Jones at 2025-04-28T18:05:19-04:00
Track rewriter sets more accurately in constraint solving

The key change, which fixed #25440, is to call `recordRewriter` in
GHC.Tc.Solver.Rewrite.rewrite_exact_fam_app.  This missing call meant
that we were secretly rewriting a Wanted with a Wanted, but not really
noticing; and that led to a very bad error message, as you can see
in the ticket.

But of course that led me into rabbit hole of other refactoring around
the RewriteSet code:

* Improve Notes [Wanteds rewrite Wanteds]

* Zonk the RewriterSet in `zonkCtEvidence` rather than only in GHC.Tc.Errors.
  This is tidier anyway (e.g. de-clutters debug output), and helps with the
  next point.

* In GHC.Tc.Solver.Equality.inertsCanDischarge, don't replace a constraint
  with no rewriters with an equal constraint that has many. See
  See (CE4) in Note [Combining equalities]

* Move zonkRewriterSet and friends from GHC.Tc.Zonk.Type into
  GHC.Tc.Zonk.TcType, where they properly belong.

A handful of tests get better error messages.

For some reason T24984 gets 12% less compiler allocation -- good

Metric Decrease:
    T24984

- - - - -
6467d61e by Brandon Chinn at 2025-04-29T18:36:03-04:00
Fix lexing "\^\" (#25937)

This broke in the refactor in !13128, where the old code parsed escape
codes and collapsed string gaps at the same time, but the new code
collapsed gaps first, then resolved escape codes. The new code used a
naive heuristic to skip escaped backslashes, but didn't account for
"\^\".

- - - - -
99868a86 by Jens Petersen at 2025-04-29T18:36:44-04:00
hadrian: default selftest to disabled
- - - - -
aba2a4a5 by Zubin Duggal at 2025-04-30T06:35:59-04:00
get-win32-tarballs.py: List tarball files to be downloaded if we cannot find them

Fixes #25929

- - - - -
d99a617b by Ben Gamari at 2025-04-30T06:36:40-04:00
Move Data ModuleName instance to Language.Haskell.Syntax.Module.Name

Fixes #25968.

- - - - -
9995c2b7 by Serge S. Gulin at 2025-05-04T17:13:36+03:00
Support for ARM64 Windows (LLVM-enabled) (fixes #24603)

1. Add Windows AArch64 cross-compilation support via CI jobs
Introduce new CI configurations for cross-compiling to Windows ARM64 using Debian12Wine, FEX, and MSYS2.
Configure toolchain variables for LLVM MinGW and Wine emulation in CI pipelines.

2. Adjust compiler and RTS for AArch64 Windows compatibility
Reserve register `x18` on Windows and Darwin platforms in AArch64 codegen.
Handle Windows-specific relocations and data sections in AArch64 assembler.
Update PEi386 linker to recognize ARM64 binaries and support exception handling.
Adjust LLVM target definitions and data layouts for new architectures.
Update `ghc-toolchain` and build scripts to handle `TablesNextToCode` on Windows ARM64.

3. Enhance CI scripts and stability
Modify `ci.sh` to handle mingw cross-targets, fixing GHC executable paths and test execution.
Use `diff -w` in tests to ignore whitespace differences, improving cross-platform consistency.

4. Refactor and clean up code
Remove redundant imports in hello.hs test.
Improve error messages and checks for unsupported configurations in the driver.
Add `EXDEV` error code to `errno.js`.
Add async/sync flags to IO logs at `base.js`.
Improve POSIX compatibility for file close at `base.js`: decrease indeterminism for mixed cases of async and sync code.

5. Update dependencies: `Cabal`, `Win32`, `directory`, `process`, `haskeline`, and `unix`.

submodule

Co-authored-by: Cheng Shao <terrorjack@type.dance>
Co-authored-by: Dmitrii Egorov <egorov.d.i@icloud.com>
Co-authored-by: Andrei Borzenkov <root@sandwitch.dev>

- - - - -
50fa8165 by Javran Cheng at 2025-05-05T05:55:39-04:00
Suppress unused do-binding if discarded variable is Any or ZonkAny.

Consider example (#25895):
...
do { forever (return ()); blah }
where `forever :: forall a b. IO a -> IO b`.

Nothing constrains `b`, so it will be instantiates with `Any` or
`ZonkAny`.
But we certainly don't want to complain about a discarded do-binding.

Fixes #25895

- - - - -
e46c6b18 by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00
Refactor mkTopLevImportedEnv out of mkTopLevEnv

This makes the code clearer and allows the top-level import context to
be fetched directly from the HomeModInfo through the API (e.g. useful
for the debugger).

- - - - -
0ce0d263 by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00
Export sizeOccEnv from GHC.Types.Name.Occurrence

Counts the number of OccNames in an OccEnv

- - - - -
165f98d8 by Simon Peyton Jones at 2025-05-06T09:02:39-04:00
Fix a bad untouchability bug im simplifyInfer

This patch addresses #26004.  The root cause was that simplifyInfer
was willing to unify variables "far out".  The fix, in
runTcSWithEvBinds', is to initialise the inert set given-eq level with
the current level. See
    (TGE6) in Note [Tracking Given equalities]
in GHC.Tc.Solver.InertSet

Two loosely related refactors:

* Refactored approximateWCX to return just the free type
  variables of the un-quantified constraints.  That avoids duplication
  of work (these free vars are needed in simplifyInfer) and makes it
  clearer that the constraints themselves are irrelevant.

* A little local refactor of TcSMode, which reduces the number of
  parameters to runTcSWithEvBinds

- - - - -
6e67fa08 by Ben Gamari at 2025-05-08T06:21:21-04:00
llvmGen: Fix built-in variable predicate

Previously the predicate to identify LLVM builtin global variables was
checking for `$llvm` rather than `@llvm` as it should.

- - - - -
a9d0a22c by Ben Gamari at 2025-05-08T06:21:22-04:00
llvmGen: Fix linkage of built-in arrays

LLVM now insists that built-in arrays use Appending linkage, not
Internal.

Fixes #25769.

- - - - -
9c6d2b1b by sheaf at 2025-05-08T06:22:11-04:00
Use mkTrAppChecked in ds_ev_typeable

This change avoids violating the invariant of mkTrApp according to which
the argument should not be a fully saturated function type.
This ensures we don't return false negatives for type equality
involving function types.

Fixes #25998

- - - - -
75cadf81 by Ryan Hendrickson at 2025-05-08T06:22:55-04:00
haddock: Preserve indentation in multiline examples

Intended for use with :{ :}, but doesn't look for those characters. Any
consecutive lines with birdtracks will only have initial whitespace
stripped up to the column of the first line.

- - - - -
fee9b351 by Cheng Shao at 2025-05-08T06:23:36-04:00
ci: re-enable chrome for wasm ghci browser tests

Currently only firefox is enabled for wasm ghci browser tests, for
some reason testing with chrome works on my machine but gets stuck on
gitlab instance runners. This patch re-enables testing with chrome by
passing `--no-sandbox`, since chrome sandboxing doesn't work in
containers without `--cap-add=SYS_ADMIN`.

- - - - -
282df905 by Vladislav Zavialov at 2025-05-09T03:18:25-04:00
Take subordinate 'type' specifiers into account

This patch fixes multiple bugs (#22581, #25983, #25984, #25991)
in name resolution of subordinate import lists.

Bug #22581
----------
In subordinate import lists, the use of the `type` namespace specifier
used to be ignored. For example, this import statement was incorrectly
accepted:

  import Prelude (Bool(type True))

Now it results in an error message:

  <interactive>:2:17: error: [GHC-51433]
    In the import of ‘Prelude’:
      a data type called ‘Bool’ is exported,
      but its subordinate item ‘True’ is not in the type namespace.

Bug #25983
----------
In subordinate import lists within a `hiding` clause, non-existent
items led to a poor warning message with -Wdodgy-imports. Consider:

  import Prelude hiding (Bool(X))

The warning message for this import statement used to misreport the
cause of the problem:

  <interactive>:3:24: warning: [GHC-56449] [-Wdodgy-imports]
    In the import of ‘Prelude’:
      an item called ‘Bool’ is exported, but it is a type.

Now the warning message is correct:

  <interactive>:2:24: warning: [GHC-10237] [-Wdodgy-imports]
    In the import of ‘Prelude’:
      a data type called ‘Bool’ is exported, but it does not export
      any constructors or record fields called ‘X’.

Bug #25984
----------
In subordinate import lists within a `hiding` clause, non-existent
items resulted in the entire import declaration being discarded.
For example, this program was incorrectly accepted:

  import Prelude hiding (Bool(True,X))
  t = True

Now it results in an error message:

  <interactive>:2:5: error: [GHC-88464]
    Data constructor not in scope: True

Bug #25991
----------
In subordinate import lists, it was not possible to refer to a class
method if there was an associated type of the same name:

  module M_helper where
    class C a b where
      type a # b
      (#) :: a -> b -> ()

  module M where
    import M_helper (C((#)))

This import declaration failed with:

  M.hs:2:28: error: [GHC-10237]
    In the import of ‘M_helper’:
      an item called ‘C’ is exported, but it does not export any children
      (constructors, class methods or field names) called ‘#’.

Now it is accepted.

Summary
-------
The changes required to fix these bugs are almost entirely confined to
GHC.Rename.Names. Other than that, there is a new error constructor
BadImportNonTypeSubordinates with error code [GHC-51433].

Test cases:
  T22581a T22581b T22581c T22581d
  T25983a T25983b T25983c T25983d T25983e T25983f T25983g
  T25984a T25984b
  T25991a T25991b1 T25991b2

- - - - -
51b0ce8f by Simon Peyton Jones at 2025-05-09T03:19:07-04:00
Slighty improve `dropMisleading`

Fix #26105, by upgrading the (horrible, hacky) `dropMisleading`
function.

This fix makes things a bit better but does not cure the underlying
problem.

- - - - -
7b2d1e6d by Simon Peyton Jones at 2025-05-11T03:24:47-04:00
Refine `noGivenNewtypeReprEqs` to account for quantified constraints

This little MR fixes #26020.  We are on the edge of completeness
for newtype equalities (that doesn't change) but this MR makes GHC
a bit more consistent -- and fixes the bug reported.

- - - - -
eaa8093b by Cheng Shao at 2025-05-11T03:25:28-04:00
wasm: mark freeJSVal as INLINE

This patch marks `freeJSVal` as `INLINE` for the wasm backend. I
noticed that the `freeJSVal` invocations are not inlined when
inspecting STG/Cmm dumps of downstream libraries that use release
build of the wasm backend. The performance benefit of inlining here is
very modest, but so is the cost anyway; if you are using `freeJSVal`
at all then you care about every potential chance to improve
performance :)

- - - - -
eac196df by Cheng Shao at 2025-05-11T03:25:28-04:00
wasm: add zero length fast path for fromJSString

This patch adds a zero length fast path for `fromJSString`; when
marshaling a zero-length `JSString` we don't need to allocate an empty
`ByteArray#` at all.

- - - - -
652cba7e by Peng Fan at 2025-05-14T04:24:35-04:00
Add LoongArch NCG support

Not supported before.

- - - - -
c01f4374 by Lin Runze at 2025-05-14T04:24:35-04:00
ci: Add LoongArch64 cross-compile CI for testing

- - - - -
ce6cf240 by Ben Gamari at 2025-05-14T04:25:18-04:00
rts/linker: Don't fail due to RTLD_NOW

In !12264 we started using the NativeObj machinery introduced some time
ago for loading of shared objects. One of the side-effects of this
change is shared objects are now loaded eagerly (i.e. with `RTLD_NOW`).
This is needed by NativeObj to ensure full visibility of the mappings of
the loaded object, which is in turn needed for safe shared object
unloading.

Unfortunately, this change subtly regressed, causing compilation
failures in some programs. Specifically, shared objects which refer to
undefined symbols (e.g. which may be usually provided by either the
executable image or libraries loaded via `dlopen`) will fail to load
with eager binding. This is problematic as GHC loads all package
dependencies while, e.g., evaluating TemplateHaskell splices. This
results in compilation failures in programs depending upon (but not
using at compile-time) packages with undefined symbol references.

To mitigate this NativeObj now first attempts to load an object via
eager binding, reverting to lazy binding (and disabling unloading) on
failure.

See Note [Don't fail due to RTLD_NOW].

Fixes #25943.

- - - - -
88ee8bb5 by Sylvain Henry at 2025-05-14T04:26:15-04:00
Deprecate GHC.JS.Prim.Internal.Build (#23432)

Deprecated as per CLC proposal 329 (https://github.com/haskell/core-libraries-committee/issues/329)

- - - - -
b4ed465b by Cheng Shao at 2025-05-14T04:26:57-04:00
libffi: update to 3.4.8

Bumps libffi submodule.

- - - - -
a3e71296 by Matthew Pickering at 2025-05-14T04:27:38-04:00
Remove leftover trace

- - - - -
2d0ecdc6 by Cheng Shao at 2025-05-14T04:28:19-04:00
Revert "ci: re-enable chrome for wasm ghci browser tests"

This reverts commit fee9b351fa5a35d5778d1252789eacaaf5663ae8.
Unfortunately the chrome test jobs may still timeout on certain
runners (e.g. OpenCape) for unknown reasons.

- - - - -
3b3a5dec by Ben Gamari at 2025-05-15T16:10:01-04:00
Don't emit unprintable characters when printing Uniques

When faced with an unprintable tag we now instead print the codepoint
number.

Fixes #25989.

(cherry picked from commit e832b1fadee66e8d6dd7b019368974756f8f8c46)

- - - - -
e1ef8974 by Mike Pilgrem at 2025-05-16T16:09:14-04:00
Translate iff in Haddock documentation into everyday English

- - - - -
fd64667d by Vladislav Zavialov at 2025-05-20T03:25:08-04:00
Allow the 'data' keyword in import/export lists (#25899)

This patch introduces the 'data' namespace specifier in import and
export lists. The intended use is to import data constructors without
their parent type constructors, e.g.

  import Data.Proxy as D (data Proxy)
  type DP = D.Proxy   -- promoted data constructor

Additionally, it is possible to use 'data' to explicitly qualify any
data constructors or terms, incl. operators and field selectors

  import Prelude (Semigroup(data (<>)))
  import Data.Function (data (&))
  import Data.Monoid (data Dual, data getDual)

  x = Dual "Hello" <> Dual "World" & getDual

The implementation mostly builds on top of the existing logic for the
'type' and 'pattern' namespace specifiers, plus there are a few tweaks
to how we generate suggestions in error messages.

- - - - -
acc86753 by Ben Gamari at 2025-05-20T03:25:51-04:00
compiler: Use field selectors when creating BCOs

This makes it easier to grep for these fields.

- - - - -
60a55fd7 by Ben Gamari at 2025-05-20T03:25:51-04:00
compiler: Clarify BCO size

Previously the semantics and size of StgBCO was a bit unclear.
Specifically, the `size` field was documented to contain the size of the
bitmap whereas it was actually the size of the closure *and* bitmap.
Additionally, it was not as clear as it could be that the bitmap was a
full StgLargeBitmap with its own `size` field.

- - - - -
ac9fb269 by Simon Peyton Jones at 2025-05-20T09:19:04-04:00
Track rewriter sets more accurately in constraint solving

This MR addresses #26003, by refactoring the arcane
intricacies of Note [Equalities with incompatible kinds].
NB: now retitled to
    Note [Equalities with heterogeneous kinds].
and the main Note for this MR.

In particular:

* Abandon invariant (COERCION-HOLE) in Note [Unification preconditions] in
  GHC.Tc.Utils.Unify.

* Abandon invariant (TyEq:CH)) in Note [Canonical equalities] in
  GHC.Tc.Types.Constraint.

* Instead: add invariant (REWRITERS) to Note [Unification preconditions]:
  unify only if the constraint has an empty rewriter set.

Implementation:

* In canEqCanLHSFinish_try_unification, skip trying unification if there is a
  non-empty rewriter set.

* To do this, make sure the rewriter set is zonked; do so in selectNextWorkItem,
  which also deals with prioritisation.

* When a coercion hole is filled, kick out inert equalities that have that hole
  as a rewriter.  It might now be unlocked and available to unify.

* Remove the ad-hoc `ch_hetero_kind` field of `CoercionHole`.

* In `selectNextWorkItem`, priorities equalities withan empty rewriter set.

* Defaulting: see (DE6) in Note [Defaulting equalities]
  and Note [Limited defaulting in the ambiguity check]

* Concreteness checks: there is some extra faff to try to get decent
  error messages when the FRR (representation-polymorphism) checks
  fail. In partiular, add a "When unifying..." explanation when the
  representation-polymorphism check arose from another constraint.

- - - - -
86406f48 by Cheng Shao at 2025-05-20T09:19:47-04:00
rts: fix rts_clearMemory logic when sanity checks are enabled

This commit fixes an RTS assertion failure when invoking
rts_clearMemory with +RTS -DS. -DS implies -DZ which asserts that free
blocks contain 0xaa as the designated garbage value. Also adds the
sanity way to rts_clearMemory test to prevent future regression.
Closes #26011.

ChatGPT Codex automatically diagnosed the issue and proposed the
initial patch in a single shot, given a GHC checkout and the following
prompt:

---

Someone is reporting the following error when attempting to use `rts_clearMemory` with the RTS option `-DS`:

```
test.wasm: internal error: ASSERTION FAILED: file rts/sm/Storage.c, line 1216

    (GHC version 9.12.2.20250327 for wasm32_unknown_wasi)
    Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug
```

What's the culprit? How do I look into this issue?

---

I manually reviewed & revised the patch, tested and submitted it.

- - - - -
7147370b by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: do not allocate strings in bytecode assembler

This patch refactors the compiler to avoid allocating iserv buffers
for BCONPtrStr at assemble-time. Now BCONPtrStr ByteStrings are
recorded as a part of CompiledByteCode, and actual allocation only
happens at link-time. This refactoring is necessary for adding
bytecode serialization functionality, as explained by the revised
comments in this commit.

- - - - -
a67db612 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: make bc_strs serializable

This commit makes the bc_strs field in CompiledByteCode serializable;
similar to previous commit, we preserve the ByteString directly and
defer the actual allocation to link-time, as mentioned in updated
comment.

- - - - -
5faf34ef by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: make bc_itbls serializable

This commit makes bc_itbls in CompiledByteCode serializable. A
dedicated ConInfoTable datatype has been added in ghci which is the
recipe for dynamically making a datacon's info table, containing the
payload of the MkConInfoTable iserv message.

- - - - -
2abaf8c1 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: remove FFIInfo bookkeeping in BCO

This commit removes the bc_ffis field from CompiledByteCode
completely, as well as all the related bookkeeping logic in
GHC.StgToByteCode. bc_ffis is actually *unused* in the rest of GHC
codebase! It is merely a list of FFIInfo, which is just a remote
pointer of the libffi ffi_cif struct; once we allocate the ffi_cif
struct and put its pointer in a CCALL instruction, we'll never free it
anyway. So there is no point of bookkeeping.

- - - - -
adb9e4d2 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: make FFIInfo serializable in BCO

This commit makes all the FFIInfo needed in CCALL instructions
serializable. Previously, when doing STG to BCO lowering, we would
allocate a libffi ffi_cif struct and keep its remote pointer as
FFIInfo; but actually we can just keep the type signature as FFIInfo
and defer the actual allocation to link-time.

- - - - -
200f401b by Cheng Shao at 2025-05-20T17:22:19-04:00
ghci: remove redundant NewBreakModule message

This commit removes the redundant NewBreakModule message from ghci: it
just allocates two strings! This functionality can be implemented with
existing MallocStrings in one iserv call.

- - - - -
ddaadca6 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: make breakpoint module name and unit id serializable

This commit makes breakpoint module name and unit id serializable, in
BRK_FUN instructions as well as ModBreaks. We can simply keep the
module name and unit ids, and defer the buffer allocation to link
time.

- - - - -
a0fde202 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: remove unused newModule

This commit removes the now unused newModule function from GHC.

- - - - -
68c8f140 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: add BCONPtrFS for interned top level string literals in BCO

This commit adds BCONPtrFS as a BCO non-pointer literal kind, which
has the same semantics of BCONPtrStr, except it contains a FastString
instead of a ByteString. By using BCONPtrFS to represent top level
string literals that are already FastString in the compilation
pipeline, we enjoy the FastString interning logic and avoid allocating
a bunch of redundant ByteStrings for the same FastStrings, especially
when we lower the BRK_FUN instruction.

- - - - -
f2b532bc by Peng Fan at 2025-05-20T17:23:15-04:00
hadrian: enable GHCi for loongarch64

- - - - -
8ded2330 by kwxm at 2025-05-20T17:24:07-04:00
Fix bugs in `integerRecipMod` and `integerPowMod`

This fixes #26017.

  * `integerRecipMod x 1` now returns `(# 1 | #)` for all x; previously it
    incorrectly returned `(# | () #)`, indicating failure.

  * `integerPowMod 0 e m` now returns `(# | () #)` for e<0 and m>1, indicating
    failure; previously it incorrectly returned `(# 0 | #)`.

- - - - -
c9abb87c by Andreas Klebinger at 2025-05-20T17:24:50-04:00
Specialise: Don't float out constraint components.

It was fairly complex to do so and it doesn't seem to improve anything.
Nofib allocations were unaffected as well.

See also Historical Note [Floating dictionaries out of cases]

- - - - -
202b201c by Andreas Klebinger at 2025-05-21T10:16:14-04:00
Interpreter: Add limited support for direct primop evaluation.

This commit adds support for a number of primops directly
to the interpreter. This avoids the indirection of going
through the primop wrapper for those primops speeding interpretation
of optimized code up massively.

Code involving IntSet runs about 25% faster with optimized core and these
changes. For core without breakpoints it's even more pronouced and I
saw reductions in runtime by up to 50%.

Running GHC itself in the interpreter was sped up by ~15% through this
change.

Additionally this comment does a few other related changes:

testsuite:
* Run foundation test in ghci and ghci-opt ways to test these
primops.
* Vastly expand the foundation test to cover all basic primops
  by comparing result with the result of calling the wrapper.

Interpreter:
* When pushing arguments for interpreted primops extend each argument to
  at least word with when pushing. This avoids some issues with big
  endian. We can revisit this if it causes performance issues.
* Restructure the stack chunk check logic. There are now macros for
  read accesses which might cross stack chunk boundries and macros which
  omit the checks which are used when we statically know we access an
  address in the current stack chunk.

- - - - -
67a177b4 by sheaf at 2025-05-21T10:17:04-04:00
QuickLook: do a shape test before unifying

This commit ensures we do a shape test before unifying. This ensures
we don't try to unify a TyVarTv with a non-tyvar, e.g.

  alpha[tyv] := Int

On the way, we refactor simpleUnifyCheck:

  1. Move the checkTopShape check into simpleUnifyCheck
  2. Refactors simpleUnifyCheck to return a value of the new type
     SimpleUnifyResult type. Now, simpleUnifyCheck returns "can unify",
     "cannot unify" or "dunno" (with "cannot unify" being the new result
     it can return). Now:
       - touchabilityTest is included; it it fails we return "cannot unify"
       - checkTopShape now returns "cannot unify" instead of "dunno" upon failure
  3. Move the call to simpleUnifyCheck out of checkTouchableTyVarEq.
     After that, checkTouchableTyVarEq becames a simple call to
     checkTyEqRhs, so we inline it.

This allows the logic in canEqCanLHSFinish_try_unification to be simplified.
In particular, we now avoid calling 'checkTopShape' twice.
Two further changes suggested by Simon were also implemented:

  - In canEqCanLHSFinish, if checkTyEqRhs returns PuFail with
    'do_not_prevent_rewriting', we now **continue with this constraint**.
    This allows us to use the constraint for rewriting.

  - checkTyEqRhs now has a top-level check to avoid flattening a tyfam app
    in a top-level equality of the form alpha ~ F tys, as this is
    going around in circles. This simplifies the implementation without
    any change in behaviour.

Fixes #25950
Fixes #26030

- - - - -
4020972c by sheaf at 2025-05-21T10:17:04-04:00
FixedRuntimeRepError: omit unhelpful explanation

This commit tweaks the FixedRuntimeRepError case of pprTcSolverReportMsg,
to avoid including an explanation which refers to a type variable that
appears nowhere else.

For example, the old error message could look like the following:

  The pattern binding does not have a fixed runtime representation.
  Its type is:
    T :: TYPE R
  Cannot unify ‘R’ with the type variable ‘c0’
  because the former is not a concrete ‘RuntimeRep’.

With this commit, we now omit the last two lines, because the concrete
type variable (here 'c0') does not appear in the type displayed to the
user (here 'T :: TYPE R').

- - - - -
6d058a69 by Andrea Bedini at 2025-05-21T16:00:51-04:00
Don't fail when ghcversion.h can't be found (#26018)

If ghcversion.h can't be found, don't try to include it. This happens
when there is no rts package in the package db and when -ghcversion-file
argument isn't passed.

Co-authored-by: Syvlain Henry <sylvain@haskus.fr>

- - - - -
b1212fbf by Vladislav Zavialov at 2025-05-21T16:01:33-04:00
Implement -Wpattern-namespace-specifier (#25900)

In accordance with GHC Proposal #581 "Namespace-specified imports",
section 2.3 "Deprecate use of pattern in import/export lists", the
`pattern` namespace specifier is now deprecated.

Test cases: T25900 T25900_noext

- - - - -
e650ec3e by Ben Gamari at 2025-05-23T03:42:46-04:00
base: Forward port changelog language from 9.12

- - - - -
94cd9ca4 by Ben Gamari at 2025-05-23T03:42:46-04:00
base: Fix RestructuredText-isms in changelog

- - - - -
7722232c by Ben Gamari at 2025-05-23T03:42:46-04:00
base: Note strictness changes made in 4.16.0.0

Addresses #25886.

- - - - -
3f4b823c by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker: Factor out ProddableBlocks machinery

- - - - -
6e23fef2 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker: Improve efficiency of proddable blocks structure

Previously the linker's "proddable blocks" check relied on a simple
linked list of spans. This resulted in extremely poor complexity while
linking objects with lots of small sections (e.g. objects built with
split sections).

Rework the mechanism to instead use a simple interval set implemented
via binary search.

Fixes #26009.

- - - - -
ea74860c by Ben Gamari at 2025-05-23T03:43:28-04:00
testsuite: Add simple functional test for ProddableBlockSet

- - - - -
74c4db46 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker/PEi386: Drop check for LOAD_LIBRARY_SEARCH_*_DIRS

The `LOAD_LIBRARY_SEARCH_USER_DIRS` and
`LOAD_LIBRARY_SEARCH_DEFAULT_DIRS` were introduced in Windows Vista and
have been available every since. As we no longer support Windows XP we
can drop this check.

Addresses #26009.

- - - - -
972d81d6 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker/PEi386: Clean up code style

- - - - -
8a1073a5 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/Hash: Factor out hashBuffer

This is a useful helper which can be used for non-strings as well.

- - - - -
44f509f2 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker/PEi386: Fix incorrect use of break in nested for

Previously the happy path of PEi386 used `break` in a double-`for` loop
resulting in redundant calls to `LoadLibraryEx`.

Fixes #26052.

- - - - -
bfb12783 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts: Correctly mark const arguments

- - - - -
08469ff8 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker/PEi386: Don't repeatedly load DLLs

Previously every DLL-imported symbol would result in a call to
`LoadLibraryEx`. This ended up constituting over 40% of the runtime of
`ghc --interactive -e 42` on Windows. Avoid this by maintaining a
hash-set of loaded DLL names, skipping the call if we have already
loaded the requested DLL.

Addresses #26009.

- - - - -
823d1ccf by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker: Expand comment describing ProddableBlockSet

- - - - -
e9de9e0b by Sylvain Henry at 2025-05-23T15:12:34-04:00
Remove emptyModBreaks

Remove emptyModBreaks and track the absence of ModBreaks with `Maybe
ModBreaks`. It avoids testing for null pointers...

- - - - -
17db44c5 by Ben Gamari at 2025-05-23T15:13:16-04:00
base: Expose Backtraces constructor and fields

This was specified in the proposal (CLC #199) yet somehow didn't make it
into the implementation.

Fixes #26049.

- - - - -
b08c08ae by soulomoon at 2025-05-28T01:57:23+08:00
Refactor handling of imported COMPLETE pragmas
from the HPT

Previously, we imported COMPLETE pragmas from all modules in the Home
Package Table (HPT) during type checking. However, since !13675, there
may be non-below modules in the HPT from the dependency tree that we do
not want to import COMPLETE pragmas from. This refactor changes the way
we handle COMPLETE pragmas from the HPT to only import them from modules
that are "below" the current module in the HPT.

- Add hugCompleteSigsBelow to filter COMPLETE pragmas from "below"
  modules in the HPT, mirroring hugRulesBelow.
- Move responsibility for calling hugCompleteSigsBelow to tcRnImports,
  storing the result in the new tcg_complete_match_env field of TcGblEnv.
- Update getCompleteMatchesTcM to use tcg_complete_match_env.

This refactor only affects how COMPLETE pragmas are imported from the
HPT, imports from external packages are unchanged.

- - - - -
16014bf8 by Hécate Kleidukos at 2025-05-28T20:09:34-04:00
Expose all of Backtraces' internals for ghc-internal

Closes #26049

- - - - -
a0adc30d by Ryan Hendrickson at 2025-05-30T14:12:52-04:00
haddock: Fix links to type operators

- - - - -
7b64697c by Mario Blažević at 2025-05-30T14:13:41-04:00
Introduce parenBreakableList and use it in ppHsContext

- - - - -
5f213bff by fendor at 2025-06-02T09:16:24+02:00
Make GHCi commands compatible with multiple home units

=== Design

We enable all GHCi features that were previously guarded by the `inMulti`
option.

GHCi supported multiple home units up to a certain degree for quite a while now.
The supported feature set was limited, due to a design impasse:
One of the home units must be "active", e.g., there must be one `HomeUnit`
whose `UnitId` is "active" which is returned when calling

```haskell
do
  hscActiveUnitId <$> getSession
```

This makes sense in a GHC session, since you are always compiling a particular
Module, but it makes less intuitive sense in an interactive session.
Given an expression to evaluate, we can't easily tell in which "context" the expression
should be parsed, typechecked and evaluated.
That's why initially, most of GHCi features, except for `:reload`ing were disabled
if the GHCi session had more than one `HomeUnitEnv`.

We lift this restriction, enabling all features of GHCi for the multiple home unit case.
To do this, we fundamentally change the `HomeUnitEnv` graph to be multiple home unit first.
Instead of differentiating the case were we have a single home unit and multiple,
we now always set up a multiple home unit session that scales seamlessly to an arbitrary
amount of home units.

We introduce two new `HomeUnitEnv`s that are always added to the `HomeUnitGraph`.
They are:

The "interactive-ghci", called the `interactiveGhciUnit`, contains the same
`DynFlags` that are used by the `InteractiveContext` for interactive evaluation
of expressions.
This `HomeUnitEnv` is only used on the prompt of GHCi, so we may refer to it as
"interactive-prompt" unit.
See Note [Relation between the `InteractiveContext` and `interactiveGhciUnitId`]
for discussing its role.

And the "interactive-session"", called `interactiveSessionUnit` or
`interactiveSessionUnitId`, which is used for loading Scripts into
GHCi that are not `Target`s of any home unit, via `:load` or `:add`.

Both of these "interactive" home units depend on all other `HomeUnitEnv`s that
are passed as arguments on the cli.
Additionally, the "interactive-ghci" unit depends on `interactive-session`.

We always evaluate expressions in the context of the
"interactive-ghci" session.
Since "interactive-ghci" depends on all home units, we can import any `Module`
from the other home units with ease.

As we have a clear `HomeUnitGraph` hierarchy, we can set `interactiveGhciUnitId`
as the active home unit for the full duration of the GHCi session.
In GHCi, we always set `interactiveGhciUnitId` to be the currently active home unit.

=== Implementation Details

Given this design idea, the implementation is relatively straight
forward.
The core insight is that a `ModuleName` is not sufficient to identify a
`Module` in the `HomeUnitGraph`. Thus, large parts of the PR is simply
about refactoring usages of `ModuleName` to prefer `Module`, which has a
`Unit` attached and is unique over the `HomeUnitGraph`.

Consequentially, most usages of `lookupHPT` are likely to be incorrect and have
been replaced by `lookupHugByModule` which is keyed by a `Module`.

In `GHCi/UI.hs`, we make sure there is only one location where we are
actually translating `ModuleName` to a `Module`:

* `lookupQualifiedModuleName`

If a `ModuleName` is ambiguous, we detect this and report it to the
user.

To avoid repeated lookups of `ModuleName`s, we store the `Module` in the
`InteractiveImport`, which additionally simplifies the interface
loading.

A subtle detail is that the `DynFlags` of the `InteractiveContext` are
now stored both in the `HomeUnitGraph` and in the `InteractiveContext`.
In UI.hs, there are multiple code paths where we are careful to update
the `DynFlags` in both locations.
Most importantly in `addToProgramDynFlags`.

---

There is one metric increase in this commit:

-------------------------
Metric Increase:
    T4029
-------------------------

It is an increase from 14.4 MB to 16.1 MB (+11.8%) which sounds like a
pretty big regression at first.
However, we argue this increase is solely caused by using more data
structures for managing multiple home units in the GHCi session.
In particular, due to the design decision of using three home units, the
base memory usage increases... but by how much?

A big contributor is the `UnitState`, of which we have three now, which
on its own 260 KB per instance. That makes an additional memory usage of
520 KB, already explaining a third of the overall memory usage increase.
Then we store more elements in the `HomeUnitGraph`, we have more
`HomeUnitEnv` entries, etc...

While we didn't chase down each byte, we looked at the memory usage over time
for both `-hi` and `-hT` profiles and can say with confidence while the memory
usage increased slightly, we did not introduce any space leak, as
the graph looks almost identical as the memory usage graph of GHC HEAD.

---

Adds testcases for GHCi multiple home units session

* Test truly multiple home unit sessions, testing reload logic and code evaluation.
* Test that GHCi commands such as `:all-types`, `:browse`, etc., work
* Object code reloading for home modules
* GHCi debugger multiple home units session

- - - - -
de603d01 by fendor at 2025-06-02T09:16:24+02:00
Update "loading compiled code" GHCi documentation

To use object code in GHCi, the module needs to be compiled for use in
GHCi. To do that, users need to compile their modules with:

* `-dynamic`
* `-this-unit-id interactive-session`

Otherwise, the interface files will not match.

- - - - -
b255a8ca by Vladislav Zavialov at 2025-06-02T16:00:12-04:00
docs: Fix code example for NoListTuplePuns

Without the fix, the example produces an error:

  Test.hs:11:3: error: [GHC-45219]
      • Data constructor ‘Tuple’ returns type ‘Tuple2 a b’
          instead of an instance of its parent type ‘Tuple a’
      • In the definition of data constructor ‘Tuple’
        In the data type declaration for ‘Tuple’

Fortunately, a one line change makes it compile.

- - - - -
6558467c by Ryan Hendrickson at 2025-06-06T05:46:58-04:00
haddock: Parse math even after ordinary characters

Fixes a bug where math sections were not recognized if preceded by a
character that isn't special (like space or a markup character).

- - - - -
265d0024 by ARATA Mizuki at 2025-06-06T05:47:48-04:00
AArch64 NCG: Fix sub-word arithmetic right shift

As noted in Note [Signed arithmetic on AArch64], we should zero-extend sub-word values.

Fixes #26061

- - - - -
05e9be18 by Simon Hengel at 2025-06-06T05:48:35-04:00
Allow Unicode in "message" and "hints" with -fdiagnostics-as-json

(fixes #26075)

- - - - -
bfa6b70f by ARATA Mizuki at 2025-06-06T05:49:24-04:00
x86 NCG: Fix code generation of bswap64 on i386

Co-authored-by: sheaf <sam.derbyshire@gmail.com>

Fix #25601

- - - - -
35826d8b by Matthew Pickering at 2025-06-08T22:00:41+01:00
Hadrian: Add option to generate .hie files for stage1 libraries

The +hie_files flavour transformer can be enabled to produce hie files
for stage1 libraries. The hie files are produced in the
"extra-compilation-artifacts" folder and copied into the resulting
bindist.

At the moment the hie files are not produced for the release flavour,
they add about 170M to the final bindist.

Towards #16901

- - - - -
e2467dbd by Ryan Hendrickson at 2025-06-09T13:07:05-04:00
Fix various failures to -fprint-unicode-syntax

- - - - -
1d99d3e4 by maralorn at 2025-06-12T03:47:39-04:00
Add necessary flag for js linking

- - - - -
974d5734 by maralorn at 2025-06-12T03:47:39-04:00
Don’t use additional linker flags to detect presence of -fno-pie in configure.ac

This mirrors the behavior of ghc-toolchain

- - - - -
1e9eb118 by Andrew Lelechenko at 2025-06-12T03:48:21-04:00
Add HasCallStack to Control.Monad.Fail.fail

CLC proposal https://github.com/haskell/core-libraries-committee/issues/327

2% compile-time allocations increase in T3064, likely because `fail`
is now marginally more expensive to compile.

Metric Increase:
    T3064

- - - - -
6d12060f by meooow25 at 2025-06-12T14:26:07-04:00
Bump containers submodule to 0.8

Also

* Disable -Wunused-imports for containers
* Allow containers-0.8 for in-tree packages
* Bump some submodules so that they allow containers-0.8. These are not
  at any particular versions.
* Remove unused deps containers and split from ucd2haskell
* Fix tests affected by the new containers and hpc-bin

- - - - -
537bd233 by Peng Fan at 2025-06-12T14:27:02-04:00
NCG/LA64: Optimize code generation and reduce build-directory size.

1. makeFarBranches: Prioritize fewer instruction sequences.
2. Prefer instructions with immediate numbers to reduce register moves,
  e.g. andi,ori,xori,addi.
3. Ppr: Remove unnecessary judgments.
4. genJump: Avoid "ld+jr" as much as possible.
5. BCOND and BCOND1: Implement conditional jumps with two jump ranges,
  with limited choice of the shortest.
6. Implement FSQRT, CLT, CTZ.
7. Remove unnecessary code.

- - - - -
19f20861 by Simon Peyton Jones at 2025-06-13T09:51:11-04:00
Improve redundant constraints for instance decls

Addresses #25992, which showed that the default methods
of an instance decl could make GHC fail to report redundant
constraints.

Figuring out how to do this led me to refactor the computation
of redundant constraints.  See the entirely rewritten

   Note [Tracking redundant constraints]

in GHC.Tc.Solver.Solve

- - - - -
1d02798e by Matthew Pickering at 2025-06-13T09:51:54-04:00
Refactor the treatment of nested Template Haskell splices

* The difference between a normal splice, a quasiquoter and implicit
splice caused by lifting is stored in the AST after renaming.

* Information that the renamer learns about splices is stored in the
relevant splice extension points (XUntypedSpliceExpr, XQuasiQuote).

* Normal splices and quasi quotes record the flavour of splice
  (exp/pat/dec etc)

* Implicit lifting stores information about why the lift was attempted,
  so if it fails, that can be reported to the user.

* After renaming, the decision taken to attempt to implicitly lift a
variable is stored in the `XXUntypedSplice` extension field in the
`HsImplicitLiftSplice` constructor.

* Since all the information is stored in the AST, in `HsUntypedSplice`,
  the type of `PendingRnSplice` now just stores a `HsUntypedSplice`.

* Error messages since the original program can be easily
  printed, this is noticeable in the case of implicit lifting.
* The user-written syntax is directly type-checked. Before, some
  desugaring took place in the
* Fixes .hie files to work better with nested splices (nested splices
  are not indexed)
* The location of the quoter in a quasiquote is now located, so error
  messages will precisely point to it (and again, it is indexed by hie
  files)

In the future, the typechecked AST should also retain information about
the splices and the specific desugaring being left to the desugarer.

Also, `runRnSplice` should call `tcUntypedSplice`, otherwise the
typechecking logic is duplicated (see the `QQError` and `QQTopError`
tests for a difference caused by this).

- - - - -
f93798ba by Cheng Shao at 2025-06-13T09:52:35-04:00
libffi: update to 3.5.1

Bumps libffi submodule.

- - - - -
c7aa0c10 by Andreas Klebinger at 2025-06-15T05:47:24-04:00
Revert "Specialise: Don't float out constraint components."

This reverts commit c9abb87ccc0c91cd94f42b3e36270158398326ef.

Turns out two benchmarks from #19747 regresses by a factor of 7-8x if
we do not float those out.

- - - - -
fd998679 by Krzysztof Gogolewski at 2025-06-15T05:48:06-04:00
Fix EPT enforcement when mixing unboxed tuples and non-tuples

The code was assuming that an alternative cannot be returning a normal
datacon and an unboxed tuple at the same time. However, as seen in #26107,
this can happen when using a GADT to refine the representation type.

The solution is just to conservatively return TagDunno.

- - - - -
e64b3f16 by ARATA Mizuki at 2025-06-17T10:13:42+09:00
MachRegs.h: Don't define NO_ARG_REGS when a XMM register is defined

On i386, MAX_REAL_VANILLA_REG is 1, but MAX_REAL_XMM_REG is 4.
If we define NO_ARG_REGS on i386, programs that use SIMD vectors may segfault.

Closes #25985

A couple of notes on the BROKEN_TESTS field:

* This fixes the segfault from T25062_V16.
* The failure from T22187_run was fixed in an earlier commit (see #25561),
  but BROKEN_TESTS was missed at that time.  Now should be a good time to
  mark it fixed.

- - - - -
3e7c6b4d by Matthew Pickering at 2025-06-18T15:34:04-04:00
Improve error messages when implicit lifting fails

This patch concerns programs which automatically try to fix level errors
by inserting `Lift`. For example:

```
foo x = [| x |]
~>
foo x = [| $(lift x) |]
```

Before, there were two problems with the message.

1. (#26031), the location of the error was reported as the whole
   quotation.
2. (#26035), the message just mentions there is no Lift instance, but
   gives no indicate why the user program needed a Lift instance in the
   first place.

This problem is especially bad when you disable
`ImplicitStagePersistence`, so you just end up with a confusing "No
instance for" message rather than an error message about levels

This patch fixes both these issues.

Firstly, `PendingRnSplice` differentiates between a user-written splice
and an implicit lift. Then, the Lift instance is precisely requested
with a specific origin in the typechecker. If the instance fails to be
solved, the message is reported using the `TcRnBadlyLevelled`
constructor (like a normal level error).

Fixes #26031, #26035

- - - - -
44b8cee2 by Cheng Shao at 2025-06-18T15:34:46-04:00
testsuite: add T26120 marked as broken

- - - - -
894a04f3 by Cheng Shao at 2025-06-18T15:34:46-04:00
compiler: fix GHC.SysTools.Ar archive member size writing logic

This patch fixes a long-standing bug in `GHC.SysTools.Ar` that emits
the wrong archive member size in each archive header. It should encode
the exact length of the member payload, excluding any padding byte,
otherwise malformed archive that extracts a broken object with an
extra trailing byte could be created.

Apart from the in-tree `T26120` test, I've also created an out-of-tree
testsuite at https://github.com/TerrorJack/ghc-ar-quickcheck that
contains QuickCheck roundtrip tests for `GHC.SysTools.Ar`. With this
fix, simple roundtrip tests and `writeGNUAr`/GNU `ar` roundtrip test
passes. There might be more bugs lurking in here, but this patch is
still a critical bugfix already.

Fixes #26120 #22586.

Co-authored-by: Codex <codex@openai.com>

- - - - -
f677ab5f by Lauren Yim at 2025-06-18T15:35:37-04:00
fix some typos in the warnings page in the user guide

- - - - -
b968e1c1 by Rodrigo Mesquita at 2025-06-18T15:36:18-04:00
Add a frozen callstack to throwGhcException

Fixes #25956

- - - - -
a5e0c3a3 by fendor at 2025-06-18T15:36:59-04:00
Update using.rst to advertise full mhu support for GHCi

- - - - -
d3e60e97 by Ryan Scott at 2025-06-18T22:29:21-04:00
Deprecate -Wdata-kinds-tc, make DataKinds issues in typechecker become errors

!11314 introduced the `-Wdata-kinds-tc` warning as part of a fix for #22141.
This was a temporary stopgap measure to allow users who were accidentally
relying on code which needed the `DataKinds` extension in order to typecheck
without having to explicitly enable the extension.

Now that some amount of time has passed, this patch deprecates
`-Wdata-kinds-tc` and upgrades any `DataKinds`-related issues in the
typechecker (which were previously warnings) into errors.

- - - - -
fd5b5177 by Ryan Hendrickson at 2025-06-18T22:30:06-04:00
haddock: Add redact-type-synonyms pragma

`{-# OPTIONS_HADDOCK redact-type-synonyms #-}` pragma will hide the RHS
of type synonyms, and display the result kind instead, if the RHS
contains any unexported types.

- - - - -
fbc0b92a by Vladislav Zavialov at 2025-06-22T04:25:16+03:00
Visible forall in GADTs (#25127)

Add support for visible dependent quantification `forall a -> t` in
types of data constructors, e.g.

  data KindVal a where
    K :: forall k.
         forall (a::k) ->   -- now allowed!
         k ->
         KindVal a

For details, see docs/users_guide/exts/required_type_arguments.rst,
which has gained a new subsection.

DataCon in compiler/GHC/Core/DataCon.hs
---------------------------------------
The main change in this patch is that DataCon, the Core representation
of a data constructor, now uses a different type to store user-written
type variable binders:

  - dcUserTyVarBinders :: [InvisTVBinder]
  + dcUserTyVarBinders :: [TyVarBinder]

where

  type TyVarBinder   = VarBndr TyVar ForAllTyFlag
  type InvisTVBinder = VarBndr TyVar Specificity

and

  data Specificity  = InferredSpec | SpecifiedSpec
  data ForAllTyFlag = Invisible Specificity | Required

This change necessitates some boring, mechanical changes scattered
throughout the diff:

    ... is now used in place of ...
   -----------------+---------------
    TyVarBinder     | InvisTVBinder
    IfaceForAllBndr | IfaceForAllSpecBndr
    Specified       | SpecifiedSpec
    Inferred        | InferredSpec
    mkForAllTys     | mkInvisForAllTys

  additionally,

    tyVarSpecToBinders      -- added or removed calls
    ifaceForAllSpecToBndrs  -- removed calls

Visibility casts in mkDataConRep
--------------------------------
Type abstractions in Core (/\a. e) always have type (forall a. t)
because coreTyLamForAllTyFlag = Specified. This is also true of data
constructor workers. So we may be faced with the following:

  data con worker:  (forall a.   blah)
  data con wrapper: (forall a -> blah)

In this case the wrapper must use a visibility cast (e |> ForAllCo ...)
with appropriately set fco_vis{L,R}. Relevant functions:

  mkDataConRep   in compiler/GHC/Types/Id/Make.hs
  dataConUserTyVarBindersNeedWrapper in compiler/GHC/Core/DataCon.hs
  mkForAllVisCos in compiler/GHC/Core/Coercion.hs
  mkCoreTyLams   in compiler/GHC/Core/Make.hs
  mkWpForAllCast in compiler/GHC/Tc/Types/Evidence.hs

More specifically:

- dataConUserTyVarBindersNeedWrapper has been updated to answer "yes"
  if there are visible foralls in the type of the data constructor.

- mkDataConRep now uses mkCoreTyLams to generate the big lambda
  abstractions (/\a b c. e) in the data con wrapper.

- mkCoreTyLams is a variant of mkCoreLams that applies visibility casts
  as needed. It similar in purpose to the pre-existing mkWpForAllCast,
  so the common bits have been factored out into mkForAllVisCos.

ConDecl in compiler/Language/Haskell/Syntax/Decls.hs
----------------------------------------------------
The surface syntax representation of a data constructor declaration is
ConDecl. In accordance with the proposal, only GADT syntax is extended
with support for visible forall, so we are interested in ConDeclGADT.

ConDeclGADT's field con_bndrs has been renamed to con_outer_bndrs
and is now accompanied by con_inner_bndrs:

  con_outer_bndrs :: XRec pass (HsOuterSigTyVarBndrs pass)
  con_inner_bndrs :: [HsForAllTelescope pass]

Visible foralls always end up in con_inner_bndrs. The outer binders are
stored and processed separately to support implicit quantification and
the forall-or-nothing rule, a design established by HsSigType.

A side effect of this change is that even in absence of visible foralls,
GHC now permits multiple invisible foralls, e.g.

  data T a where { MkT :: forall a b. forall c d. ... -> T a }

But of course, this is done in service of making at least some of these
foralls visible. The entire compiler front-end has been updated to deal
with con_inner_bndrs. See the following modified or added functions:

  Parser:
      mkGadtDecl     in compiler/GHC/Parser/PostProcess.hs
      splitLHsGadtTy in compiler/GHC/Hs/Type.hs
  Pretty-printer:
      pprConDecl           in compiler/GHC/Hs/Decls.hs
      pprHsForAllTelescope in compiler/GHC/Hs/Type.hs
  Renamer:
      rnConDecl                 in compiler/GHC/Rename/Module.hs
      bindHsForAllTelescopes    in compiler/GHC/Rename/HsType.hs
      extractHsForAllTelescopes in compiler/GHC/Rename/HsType.hs
  Type checker:
      tcConDecl           in compiler/GHC/Tc/TyCl.hs
      tcGadtConTyVarBndrs in compiler/GHC/Tc/Gen/HsType.hs

Template Haskell
----------------
The TH AST is left unchanged for the moment to avoid breakage. An
attempt to quote or reify a data constructor declaration with visible
forall in its type will result an error:

  data ThRejectionReason       -- in GHC/HsToCore/Errors/Types.hs
    = ...
    | ThDataConVisibleForall   -- new error constructor

However, as noted in the previous section, GHC now permits multiple
invisible foralls, and TH was updated accordingly. Updated code:

      repC         in compiler/GHC/HsToCore/Quote.hs
      reifyDataCon in compiler/GHC/Tc/Gen/Splice.hs
      ppr @Con     in libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs

Pattern matching
----------------
Everything described above concerns data constructor declarations, but
what about their use sites? Now it is trickier to type check a pattern
match fn(Con a b c)=... because we can no longer assume that a,b,c are
all value arguments. Indeed, some or all of them may very well turn out
to be required type arguments.

To that end, see the changes to:

      tcDataConPat   in compiler/GHC/Tc/Gen/Pat.hs
      splitConTyArgs in compiler/GHC/Tc/Gen/Pat.hs

and the new helpers split_con_ty_args, zip_pats_bndrs.

This is also the reason the TcRnTooManyTyArgsInConPattern error
constructor has been removed. The new code emits TcRnArityMismatch
or TcRnIllegalInvisibleTypePattern.

Summary
-------
DataCon, ConDecl, as well as all related functions have been updated to
support required type arguments in data constructors.

Test cases:
  HieGadtConSigs   GadtConSigs_th_dump1   GadtConSigs_th_pprint1
  T25127_data      T25127_data_inst       T25127_infix
  T25127_newtype   T25127_fail_th_quote   T25127_fail_arity
  TyAppPat_Tricky

Co-authored-by: mniip <mniip@mniip.com>

- - - - -
ae003a3a by Teo Camarasu at 2025-06-23T05:21:48-04:00
linters: lint-whitespace: bump upper-bound for containers

The version of containers was bumped in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13989

- - - - -
0fb37893 by Matthew Pickering at 2025-06-23T13:55:10-04:00
Move ModuleGraph into UnitEnv

The ModuleGraph is a piece of information associated with the
ExternalPackageState and HomeUnitGraph. Therefore we should store it
inside the HomeUnitEnv.

- - - - -
3bf6720e by soulomoon at 2025-06-23T13:55:52-04:00
Remove hptAllFamInstances usage during upsweep

Fixes #26118

This change eliminates the use of hptAllFamInstances during the upsweep phase,
as it could access non-below modules from the home package table.

The following updates were made:

* Updated checkFamInstConsistency to accept an explicit ModuleEnv FamInstEnv
  parameter and removed the call to hptAllFamInstances.
* Adjusted hugInstancesBelow so we can construct ModuleEnv FamInstEnv
  from its result,
* hptAllFamInstances and allFamInstances functions are removed.

- - - - -
83ee7b78 by Ben Gamari at 2025-06-24T05:02:07-04:00
configure: Don't force value of OTOOL, etc. if not present

Previously if `otool` and `install_name_tool` were not present they
would be overridden by `fp_settings.m4`. This logic was introduced in
4ff93292243888545da452ea4d4c1987f2343591 without explanation.

- - - - -
9329c9e1 by Ben Gamari at 2025-06-24T05:02:07-04:00
ghc-toolchain: Add support for otool, install_name_tool

Fixes part of ghc#23675.

- - - - -
25f5c998 by Ben Gamari at 2025-06-24T05:02:08-04:00
ghc-toolchain: Add support for llc, opt, llvm-as

Fixes #23675.

- - - - -
51d150dd by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00
hadrian: Use settings-use-distro-mingw directly

The type `ToolchainSetting` only made sense when we had more settings to
fetch from the system config file. Even then "settings-use-distro-mingw"
is arguably not a toolchain setting.

With the fix for #23675, all toolchain tools were moved to the
`ghc-toolchain` `Toolchain` format. Therefore, we can inline
`settings-use-distro-mingw` accesses and delete `ToolchainSetting`.

- - - - -
dcf68a83 by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00
configure: Check LlvmTarget exists for LlvmAsFlags

If LlvmTarget was empty, LlvmAsFlags would be just "--target=".
If it is empty now, simply keep LlvmAsFlags empty.

ghc-toolchain already does this right. This fix makes the two
configurations match up.

- - - - -
580a3353 by Ben Gamari at 2025-06-24T05:02:51-04:00
rts/linker/LoadArchive: Use bool

Improve type precision by using `bool` instead of `int` and `StgBool`.

- - - - -
76d1041d by Ben Gamari at 2025-06-24T05:02:51-04:00
rts/linker/LoadArchive: Don't rely on file extensions for identification

Previously archive members would be identified via their file extension,
as described in #13103. We now instead use a more principled approach,
relying on the magic number in the member's header.

As well, we refactor treatment of archive format detection to improve
code clarity and error handling.

Closes #13103.

- - - - -
4b748a99 by Teo Camarasu at 2025-06-24T15:31:07-04:00
template-haskell: improve changelog

stable -> more stable, just to clarify that this interface isn't fully stable.

errornously -> mistakenly: I typod this and also let's go for a simpler word
- - - - -
e358e477 by Sylvain Henry at 2025-06-24T15:31:58-04:00
Bump stack resolver to use GHC 9.6.7

Cf #26139

- - - - -
4bf5eb63 by fendor at 2025-06-25T17:05:43-04:00
Teach `:reload` about multiple home units

`:reload` needs to lookup the `ModuleName` and must not assume the given
`ModuleName` is in the current `HomeUnit`.

We add a new utility function which allows us to find a `HomeUnitModule`
instead of a `Module`.

Further, we introduce the `GhciCommandError` type which can be used to
abort the execution of a GHCi command.
This error is caught and printed in a human readable fashion.

- - - - -
b3d97bb3 by fendor at 2025-06-25T17:06:25-04:00
Implement `-fno-load-initial-targets` flag

We add the new flag `-fno-load-initial-targets` which doesn't load all `Target`s
immediately but only computes the module graph for all `Target`s.
The user can then decide to load modules from that module graph using
the syntax:

    ghci> :reload <Mod>

This will load everything in the module graph up to `Mod`.

The user can return to the initial state by using the builtin target
`none` to unload all modules.

    ghci> :reload none

Is in principle identical to starting a new session with the
`-fno-load-initial-targets` flag.

The `-fno-load-initial-targets` flag allows for faster startup time of GHCi when a
user has lots of `Target`s.

We additionally extend the `:reload` command to accept multiple
`ModuleName`s. For example:

    ghci> :reload <Mod1> <Mod2>

Loads all modules up to the modules `Mod1` and `Mod2`.

- - - - -
49f44e52 by Teo Camarasu at 2025-06-26T04:19:51-04:00
Expose ghc-internal unit id through the settings file

This in combination with the unit id of the compiler library allows
cabal to know of the two unit ids that should not be reinstalled (in
specific circumstances) as:
- when using plugins, we want to link against exactly the compiler unit
id
- when using TemplateHaskell we want to link against exactly the package
that contains the TemplateHaskell interfaces, which is `ghc-internal`

See: <https://github.com/haskell/cabal/issues/10087>

Resolves #25282

- - - - -
499c4efe by Bryan Richter at 2025-06-26T04:20:33-04:00
CI: Fix and clean up capture of timings

* Fixes the typo that caused 'cat ci-timings' to report "no such file or
  directory"
* Gave ci_timings.txt a file extension so it may play better with other
  systems
* Fixed the use of time_it so all times are recorded
* Fixed time_it to print name along with timing

- - - - -
86c90c9e by Bryan Richter at 2025-06-26T04:20:33-04:00
CI: Update collapsible section usage

The syntax apparently changed at some point.

- - - - -
04308ee4 by Bryan Richter at 2025-06-26T04:20:33-04:00
CI: Add more collapsible sections

- - - - -
43b606bb by Florian Ragwitz at 2025-06-27T16:31:26-04:00
Tick uses of wildcard/pun field binds as if using the record selector function

Fixes #17834.

See Note [Record-selector ticks] for additional reasoning behind this as well
as an overview of the implementation details and future improvements.

- - - - -
d4952549 by Ben Gamari at 2025-06-27T16:32:08-04:00
testsuite/caller-cc: Make CallerCc[123] less sensitive

These were previously sensitive to irrelevant changes in program
structure. To avoid this we filter out all by lines emitted by the
-fcaller-cc from the profile.

- - - - -
8d33d048 by Berk Özkütük at 2025-07-07T20:42:20-04:00
Consider `PromotedDataCon` in `tyConStupidTheta`

Haddock checks data declarations for the stupid theta so as not to
pretty-print them as empty contexts. Type data declarations end up as
`PromotedDataCon`s by the time Haddock performs this check, causing a
panic. This commit extends `tyConStupidTheta` so that it returns an
empty list for `PromotedDataCon`s. This decision was guided by the fact
that type data declarations never have data type contexts (see (R1) in
Note [Type data declarations]).

Fixes #25739.

- - - - -
a26243fd by Ryan Hendrickson at 2025-07-07T20:43:07-04:00
haddock: Document instances from other packages

When attaching instances to `Interface`s, it isn't enough just to look
for instances in the list of `Interface`s being processed. We also need
to look in the modules on which they depend, including those outside of
this package.

Fixes #25147.
Fixes #26079.

- - - - -
0fb24420 by Rodrigo Mesquita at 2025-07-07T20:43:49-04:00
hadrian: Fallback logic for internal interpreter

When determining whether to build the internal interpreter, the `make`
build system had a fallback case for platforms not in the list of
explicitly-supported operating systems and architectures.

This fallback says we should try to build the internal interpreter if
building dynamic GHC programs (if the architecture is unknown).

Fixes #24098

- - - - -
fe925bd4 by Ben Gamari at 2025-07-07T20:44:30-04:00
users-guide: Reference Wasm FFI section

- - - - -
5856284b by Ben Gamari at 2025-07-07T20:44:30-04:00
users-guide: Fix too-short heading warning

- - - - -
a48dcdf3 by Duncan Coutts at 2025-07-07T20:45:18-04:00
Reorganise documentation for allocate* functions

Consolodate interface information into the .h file, keeping just
implementation details in the .c file.

Use Notes stlye in the .h file and refer to notes from the .c file.

- - - - -
de5b528c by Duncan Coutts at 2025-07-07T20:45:18-04:00
Introduce common utilities for allocating arrays

The intention is to share code among the several places that do this
already.

- - - - -
b321319d by Duncan Coutts at 2025-07-07T20:45:18-04:00
Use new array alloc utils in Heap.c

The CMM primop can now report heap overflow.

- - - - -
1d557ffb by Duncan Coutts at 2025-07-07T20:45:18-04:00
Use new array alloc utils in ThreadLabels.c

Replacing a local utility.

- - - - -
e59a1430 by Duncan Coutts at 2025-07-07T20:45:18-04:00
Use new array alloc utils in Threads.c

Replacing local open coded version.

- - - - -
482df1c9 by Duncan Coutts at 2025-07-07T20:45:18-04:00
Add exitHeapOverflow helper utility

This will be useful with the array alloc functions, since unlike
allocate/allocateMaybeFail, they do not come in two versions. So if it's
not convenient to propagate failure, then one can use this.

- - - - -
4d3ec8f9 by Duncan Coutts at 2025-07-07T20:45:18-04:00
Use new array alloc utils in Weak.c

Also add a cpp macro CCS_SYSTEM_OR_NULL which does what it says. The
benefit of this is that it allows us to referece CCS_SYSTEM even when
we're not in PROFILING mode. That makes abstracting over profiling vs
normal mode a lot easier.

- - - - -
0c4f2fde by Duncan Coutts at 2025-07-07T20:45:18-04:00
Convert the array alloc primops to use the new array alloc utils

- - - - -
a3354ad9 by Duncan Coutts at 2025-07-07T20:45:18-04:00
While we're at it, add one missing 'likely' hint

To a cmm primops that raises an exception, like the others now do.

- - - - -
33b546bd by meooow25 at 2025-07-07T20:46:09-04:00
Keep scanl' strict in the head on rewrite

`scanl'` forces elements to WHNF when the corresponding `(:)`s are
forced. The rewrite rule for `scanl'` missed forcing the first element,
which is fixed here with a `seq`.

- - - - -
8a69196e by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00
debugger/rts: Allow toggling step-in per thread

The RTS global flag `rts_stop_next_breakpoint` globally sets the
interpreter to stop at the immediate next breakpoint.

With this commit, single step mode can additionally be set per thread in
the TSO flag (TSO_STOP_NEXT_BREAKPOINT).

Being able to toggle "stop at next breakpoint" per thread is an
important requirement for implementing "stepping out" of a function in a
multi-threaded context.

And, more generally, having a per-thread flag for single-stepping paves the
way for multi-threaded debugging.

That said, when we want to enable "single step" mode for the whole
interpreted program we still want to stop at the immediate next
breakpoint, whichever thread it belongs to.

That's why we also keep the global `rts_stop_next_breakpoint` flag, with
`rts_enableStopNextBreakpointAll` and `rts_disableStopNextBreakpointAll` helpers.

Preparation for #26042

- - - - -
73d3f864 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00
docs: Case continuation BCOs

This commit documents a subtle interaction between frames for case BCOs
and their parents frames. Namely, case continuation BCOs may refer to
(non-local) variables that are part of the parent's frame.

The note expanding a bit on these details is called [Case continuation BCOs]

- - - - -
d7aeddcf by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00
debugger: Implement step-out feature

Implements support for stepping-out of a function (aka breaking right after
returning from a function) in the interactive debugger.

It also introduces a GHCi command :stepout to step-out of a function
being debugged in the interpreter. The feature is described as:

    Stop at the first breakpoint immediately after returning from the current
    function scope.

    Known limitations: because a function tail-call does not push a stack
    frame, if step-out is used inside of a function that was tail-called,
    execution will not be returned to its caller, but rather its caller's
    first non-tail caller. On the other hand, it means the debugger
    follows the more realistic execution of the program.
    In the following example:

    .. code-block:: none

    f = do
       a
       b <--- (1) set breakpoint then step in here
       c
    b = do
       ...
       d <--- (2) step-into this tail call
    d = do
       ...
       something <--- (3) step-out here
       ...

    Stepping-out will stop execution at the `c` invokation in `f`, rather than
    stopping at `b`.

The key idea is simple: When step-out is enabled, traverse the runtime
stack until a continuation BCO is found -- and enable the breakpoint
heading that BCO explicitly using its tick-index.
The details are specified in `Note [Debugger: Step-out]` in `rts/Interpreter.c`.

Since PUSH_ALTS BCOs (representing case continuations) were never headed
by a breakpoint (unlike the case alternatives they push), we introduced
the BRK_ALTS instruction to allow the debugger to set a case
continuation to stop at the breakpoint heading the alternative that is
taken. This is further described in `Note [Debugger: BRK_ALTS]`.

Fixes #26042

- - - - -
5d9adf51 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00
debugger: Filter step-out stops by SrcSpan

To implement step-out, the RTS looks for the first continuation frame on
the stack and explicitly enables its entry breakpoint. However, some
continuations will be contained in the function from which step-out was
initiated (trivial example is a case expression).

Similarly to steplocal, we will filter the breakpoints at which the RTS
yields to the debugger based on the SrcSpan. When doing step-out, only
stop if the breakpoint is /not/ contained in the function from which we
initiated it.

This is especially relevant in monadic statements such as IO which is
compiled to a long chain of case expressions.

See Note [Debugger: Filtering step-out stops]

- - - - -
7677adcc by Cheng Shao at 2025-07-08T07:40:29-04:00
compiler: make ModBreaks serializable

- - - - -
14f67c6d by Rodrigo Mesquita at 2025-07-08T07:40:29-04:00
refactor: "Inspecting the session" moved from GHC

Moved utilities for inspecting the session from the GHC module to
GHC.Driver.Session.Inspect

Purely a clean up

- - - - -
9d3f484a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Pass the HUG to readModBreaks, not HscEnv

A minor cleanup. The associated history and setupBreakpoint functions
are changed accordingly.

- - - - -
b595f713 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Move readModBreaks to GHC.Runtime.Interpreter

With some small docs changes

- - - - -
d223227a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Move interpreterProfiled to Interp.Types

Moves interpreterProfiled and interpreterDynamic to
GHC.Runtime.Interpreter.Types from GHC.Runtime.Interpreter.

- - - - -
7fdd0a3d by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Don't import GHC in Debugger.Breakpoints

Remove the top-level

    import GHC

from GHC.Runtime.Debugger.Breakpoints

This makes the module dependencies more granular and cleans up the
qualified imports from the code.

- - - - -
5e4da31b by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
refactor: Use BreakpointId in Core and Ifaces

- - - - -
741ac3a8 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
stg2bc: Derive BcM via ReaderT StateT

A small refactor that simplifies GHC.StgToByteCode by deriving-via the
Monad instances for BcM. This is done along the lines of previous
similar refactors like 72b54c0760bbf85be1f73c1a364d4701e5720465.

- - - - -
0414fcc9 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
refact: Split InternalModBreaks out of ModBreaks

There are currently two competing ways of referring to a Breakpoint:

    1. Using the Tick module + Tick index
    2. Using the Info module + Info index

1. The Tick index is allocated during desugaring in `mkModBreaks`. It is
used to refer to a breakpoint associated to a Core Tick. For a given
Tick module, there are N Ticks indexed by Tick index.

2. The Info index is allocated during code generation (in StgToByteCode)
and uniquely identifies the breakpoints at runtime (and is indeed used
to determine which breakpoint was hit at runtime).

Why we need both is described by Note [Breakpoint identifiers].

For every info index we used to keep a `CgBreakInfo`, a datatype containing
information relevant to ByteCode Generation, in `ModBreaks`.

This commit splits out the `IntMap CgBreakInfo` out of `ModBreaks` into
a new datatype `InternalModBreaks`.

    - The purpose is to separate the `ModBreaks` datatype, which stores
      data associated from tick-level information which is fixed after
      desugaring, from the unrelated `IntMap CgBreakInfo` information
      accumulated during bytecode generation.

    - We move `ModBreaks` to GHC.HsToCore.Breakpoints

The new `InternalModBreaks` simply combines the `IntMap CgBreakInfo`
with `ModBreaks`. After code generation we construct an
`InternalModBreaks` with the `CgBreakInfo`s we accumulated and the
existing `ModBreaks` and store that in the compiled BCO in `bc_breaks`.

    - Note that we previously only updated the `modBreaks_breakInfo`
      field of `ModBreaks` at this exact location, and then stored the
      updated `ModBreaks` in the same `bc_breaks`.

    - We put this new datatype in GHC.ByteCode.Breakpoints

The rest of the pipeline for which CgBreakInfo is relevant is
accordingly updated to also use `InternalModBreaks`

- - - - -
2a097955 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Use BreakpointIds in bytecode gen

Small clean up to use BreakpointId and InternalBreakpointId more
uniformly in bytecode generation rather than using Module + Ix pairs

- - - - -
0515cc2f by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
ghci: Allocate BreakArrays at link time only

Previously, a BreakArray would be allocated with a slot for every tick
in a module at `mkModBreaks`, in HsToCore. However, this approach has
a few downsides:

- It interleaves interpreter behaviour (allocating arrays for
  breakpoints) within the desugarer

- It is inflexible in the sense it is impossible for the bytecode
  generator to add "internal" breakpoints that can be triggered at
  runtime, because those wouldn't have a source tick. (This is relevant
  for our intended implementation plan of step-out in #26042)

- It ties the BreakArray indices to the *tick* indexes, while at runtime
  we would rather just have the *info* indexes (currently we have both
  because BreakArrays are indexed by the *tick* one).

Paving the way for #26042 and #26064, this commit moves the allocation
of BreakArrays to bytecode-loading time -- akin to what is done for CCS
arrays.

Since a BreakArray is allocated only when bytecode is linked, if a
breakpoint is set (e.g. `:break 10`) before the bytecode is linked,
there will exist no BreakArray to trigger the breakpoint in.

Therefore, the function to allocate break arrays (`allocateBreakArrays`)
is exposed and also used in GHC.Runtime.Eval to allocate a break array
when a breakpoint is set, if it doesn't exist yet (in the linker env).

- - - - -
8016561f by Simon Peyton Jones at 2025-07-08T07:41:13-04:00
Add a test for T26176

- - - - -
454cd682 by Simon Peyton Jones at 2025-07-08T07:41:13-04:00
Add test for #14010

This test started to work in GHC 9.6 and has worked since.
This MR just adds a regression test

- - - - -
ea2c6673 by Teo Camarasu at 2025-07-08T13:24:43-04:00
Implement user-defined allocation limit handlers

Allocation Limits allow killing a thread if they allocate more than a
user-specified limit.
We extend this feature to allow more versatile behaviour.

- We allow not killing the thread if the limit is exceeded.
- We allow setting a custom handler to be called when the limit is exceeded.

User-specified allocation limit handlers run in a fresh thread and are passed
the ThreadId of the thread that exceeded its limit.

We introduce utility functions for getting and setting the allocation
limits of other threads, so that users can reset the limit of a thread
from a handler. Both of these are somewhat coarse-grained as we are
unaware of the allocations in the current nursery chunk.

We provide several examples of usages in testsuite/tests/rts/T22859.hs

Resolves #22859

- - - - -
03e047f9 by Simon Hengel at 2025-07-08T13:25:25-04:00
Fix typo in using.rst

- - - - -
67957854 by Ben Gamari at 2025-07-09T09:44:44-04:00
compiler: Import AnnotationWrapper from ghc-internal

Since `GHC.Desugar` exported from `base` has been deprecated.

- - - - -
813d99d6 by Ben Gamari at 2025-07-09T09:44:44-04:00
ghc-compact: Eliminate dependency on ghc-prim

- - - - -
0ec952a1 by Ben Gamari at 2025-07-09T09:44:44-04:00
ghc-heap: Eliminate dependency on ghc-prim

- - - - -
480074c3 by Ben Gamari at 2025-07-09T09:44:44-04:00
ghc-heap: Drop redundant import

- - - - -
03455829 by Ben Gamari at 2025-07-09T09:44:45-04:00
ghc-prim: Bump version to 0.13.1

There are no interface changes from 0.13.0 but the implementation now
lives in `ghc-internal`.

- - - - -
d315345a by Ben Gamari at 2025-07-09T09:44:45-04:00
template-haskell: Bump version number to 2.24.0.0

Bumps exceptions submodule.

- - - - -
004c800e by Ben Gamari at 2025-07-09T09:44:45-04:00
Bump GHC version number to 9.14

- - - - -
eb1a3816 by Ben Gamari at 2025-07-09T09:44:45-04:00
Bump parsec to 3.1.18.0

Bumps parsec submodule.

- - - - -
86f83296 by Ben Gamari at 2025-07-09T09:44:45-04:00
unix: Bump to 2.8.7.0

Bumps unix submodule.

- - - - -
89e13998 by Ben Gamari at 2025-07-09T09:44:45-04:00
binary: Bump to 0.8.9.3

Bumps binary submodule.

- - - - -
55fff191 by Ben Gamari at 2025-07-09T09:44:45-04:00
Win32: Bump to 2.14.2.0

Bumps Win32 submodule.

- - - - -
7dafa40c by Ben Gamari at 2025-07-09T09:44:45-04:00
base: Bump version to 4.22.0

Bumps various submodules.

- - - - -
ef03d8b8 by Rodrigo Mesquita at 2025-07-09T09:45:28-04:00
base: Export displayExceptionWithInfo

This function should be exposed from base following CLC#285

Approved change in CLC#344

Fixes #26058

- - - - -
01d3154e by Wen Kokke at 2025-07-10T17:06:36+01:00
Fix documentation for HEAP_PROF_SAMPLE_STRING

- - - - -
ac259c48 by Wen Kokke at 2025-07-10T17:06:38+01:00
Fix documentation for HEAP_PROF_SAMPLE_COST_CENTRE

- - - - -
2b4db9ba by Pi Delport at 2025-07-11T16:40:52-04:00
(Applicative docs typo: missing "one")

- - - - -
f707bab4 by Andreas Klebinger at 2025-07-12T14:56:16+01:00
Specialise: Improve specialisation by refactoring interestingDict

This MR addresses #26051, which concerns missed type-class specialisation.
The main payload of the MR is to completely refactor the key function
      `interestingDict` in GHC.Core.Opt.Specialise

The main change is that we now also look at the structure of the
dictionary we consider specializing on, rather than only the type.

See the big `Note [Interesting dictionary arguments]`

- - - - -
ca7a9d42 by Simon Peyton Jones at 2025-07-12T14:56:16+01:00
Treat tuple dictionaries uniformly; don't unbox them

See `Note [Do not unbox class dictionaries]` in DmdAnal.hs,
sep (DNB1).

This MR reverses the plan in #23398, which suggested a special case to
unbox tuple dictionaries in worker/wrapper.  But:

- This was the cause of a pile of complexity in the specialiser (#26158)

- Even with that complexity, specialision was still bad, very bad
  See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297

And it's entirely unnecessary!  Specialision works fine without
unboxing tuple dictionaries.

- - - - -
be7296c9 by Andreas Klebinger at 2025-07-12T14:56:16+01:00
Remove complex special case from the type-class specialiser

There was a pretty tricky special case in Specialise which is no
longer necessary.
   * Historical Note [Floating dictionaries out of cases]
   * #26158
   * #19747 https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297

This MR removes it.  Hooray.

- - - - -
4acf3a86 by Ben Gamari at 2025-07-15T05:46:32-04:00
configure: bump version to 9.15

- - - - -
45efaf71 by Teo Camarasu at 2025-07-15T05:47:13-04:00
rts/nonmovingGC: remove n_free

We remove the nonmovingHeap.n_free variable.

We wanted this to track the length of nonmovingHeap.free.
But this isn't possible to do atomically.

When this isn't accurate we can get a segfault by going past the end of
the list.

Instead, we just count the length of the list when we grab it in
nonmovingPruneFreeSegment.

Resolves #26186

- - - - -
c635f164 by Ben Gamari at 2025-07-15T14:05:54-04:00
configure: Drop probing of ld.gold

As noted in #25716, `gold` has been dropped from binutils-2.44.

Fixes #25716.

Metric Increase:
    size_hello_artifact_gzip
    size_hello_unicode_gzip
    ghc_prim_so

- - - - -
637bb538 by Ben Gamari at 2025-07-15T14:05:55-04:00
testsuite/recomp015: Ignore stderr

This is necessary since ld.bfd complains
that we don't have a .note.GNU-stack section,
potentially resulting in an executable stack.
- - - - -
d3cd4ec8 by Wen Kokke at 2025-07-15T14:06:39-04:00
Fix documentation for heap profile ID

- - - - -
73082769 by Ben Gamari at 2025-07-15T16:56:38-04:00
Bump win32-tarballs to v0.9
- - - - -
3b63b254 by Ben Gamari at 2025-07-15T16:56:39-04:00
rts/LoadArchive: Handle null terminated string tables

As of `llvm-ar` now emits filename tables terminated with null
characters instead of the usual POSIX `/\n` sequence.

Fixes #26150.

- - - - -
195f6527 by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: rename label so name doesn't conflict with param

- - - - -
63373b95 by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: Handle API set symbol versioning conflicts

- - - - -
48e9aa3e by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: Mark API set symbols as HIDDEN and correct symbol type

- - - - -
959e827a by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: Implement WEAK EXTERNAL undef redirection by target symbol name

- - - - -
65f19293 by Ben Gamari at 2025-07-15T16:56:39-04:00
rts/LoadArchive: Handle string table entries terminated with /

llvm-ar appears to terminate string table entries with `/\n` [1]. This
matters in the case of thin archives, since the filename is used. In the
past this worked since `llvm-ar` would produce archives with "small"
filenames when possible. However, now it appears to always use the
string table.

[1] https://github.com/llvm/llvm-project/blob/bfb686bb5ba503e9386dc899e1ebbe2488...

- - - - -
9cbb3ef5 by Ben Gamari at 2025-07-15T16:56:39-04:00
testsuite: Mark T12497 as fixed

Thanks to the LLVM toolchain update.

Closes #22694.

- - - - -
2854407e by Ben Gamari at 2025-07-15T16:56:39-04:00
testsuite: Accept new output of T11223_link_order_a_b_2_fail on Windows

The archive member number changed due to the fact that llvm-ar now uses a
string table.

- - - - -
28439593 by Ben Gamari at 2025-07-15T16:56:39-04:00
rts/linker/PEi386: Implement IMAGE_REL_AMD64_SECREL

This appears to now be used by libc++ as distributed by msys2.

- - - - -
2b053755 by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: Cleanup merge resolution residue in lookupSymbolInDLL_PEi386 and make safe without dependent

- - - - -
e8acd2e7 by Wen Kokke at 2025-07-16T08:37:04-04:00
Remove the `profile_id` parameter from various RTS functions.

Various RTS functions took a `profile_id` parameter, intended to be used to
distinguish parallel heap profile breakdowns (e.g., `-hT` and `-hi`). However,
this feature was never implemented and the `profile_id` parameter was set to 0
throughout the RTS. This commit removes the parameter but leaves the hardcoded
profile ID in the functions that emit the encoded eventlog events as to not
change the protocol.

The affected functions are `traceHeapProfBegin`, `postHeapProfBegin`,
`traceHeapProfSampleString`, `postHeapProfSampleString`,
`traceHeapProfSampleCostCentre`, and `postHeapProfSampleCostCentre`.

- - - - -
76d392a2 by Wen Kokke at 2025-07-16T08:37:04-04:00
Make `traceHeapProfBegin` an init event.

- - - - -
bbaa44a7 by Peng Fan at 2025-07-16T16:50:42-04:00
NCG/LA64: Support finer-grained DBAR hints

For LA664 and newer uarchs, they have made finer granularity hints
available:

    Bit4: ordering or completion (0: completion, 1: ordering)
    Bit3: barrier for previous read (0: true, 1: false)
    Bit2: barrier for previous write (0: true, 1: false)
    Bit1: barrier for succeeding read (0: true, 1: false)
    Bit0: barrier for succeeding write (0: true, 1: false)

And not affect the existing models because other hints are treated
as 'dbar 0' there.

- - - - -
7da86e16 by Andreas Klebinger at 2025-07-16T16:51:25-04:00
Disable -fprof-late-overloaded-calls for join points.

Currently GHC considers cost centres as destructive to
join contexts. Or in other words this is not considered valid:

    join f x = ...
    in
              ... -> scc<tick> jmp

This makes the functionality of `-fprof-late-overloaded-calls` not feasible
for join points in general. We used to try to work around this by putting the
ticks on the rhs of the join point rather than around the jump. However beyond
the loss of accuracy this was broken for recursive join points as we ended up
with something like:

    rec-join f x = scc<tick> ... jmp f x

Which similarly is not valid as the tick once again destroys the tail call.
One might think we could limit ourselves to non-recursive tail calls and do
something clever like:

  join f x = scc<tick> ...
  in ... jmp f x

And sometimes this works! But sometimes the full rhs would look something like:

  join g x = ....
  join f x = scc<tick> ... -> jmp g x

Which, would again no longer be valid. I believe in the long run we can make
cost centre ticks non-destructive to join points. Or we could keep track of
where we are/are not allowed to insert a cost centre. But in the short term I will
simply disable the annotation of join calls under this flag.

- - - - -
7ee22fd5 by ARATA Mizuki at 2025-07-17T06:05:30-04:00
x86 NCG: Better lowering for shuffleFloatX4# and shuffleDoubleX2#

The new implementation

* make use of specialized instructions like (V)UNPCK{L,H}{PS,PD}, and
* do not require -mavx.

Close #26096

Co-authored-by: sheaf <sam.derbyshire@gmail.com>

- - - - -
c6cd2da1 by Jappie Klooster at 2025-07-17T06:06:20-04:00
Update interact docs to explain about buffering

We need to tell the user to set to the
appropriate buffer format.
Otherwise, this function may get randomly stuck,
or just behave confusingly.

issue: https://gitlab.haskell.org/ghc/ghc/-/issues/26131

NB, I'm running this with cabal *NOT* ghci. ghci messes with buffering anyway.

```haskell
interaction :: String -> String
interaction "jappie" = "hi"
interaction "jakob" = "hello"
interaction x = "unkown input: " <> x

main :: IO ()
main = interact  interaction
```
so in my input (prefixed by `>`) I get:

```
...
jappie
unkown input: jappie

we confirmed later this was due to lack of \n matching.
Anyway movnig on to more unexpected stuff:

```haskell
main :: IO ()
main = do
  interact  (concatMap interaction . lines)

get's stuck forever.
actually `^D` (ctrl+d) unstucks it and runs all input as expected.
for example you can get:
```
...
sdfkds
fakdsf
unkown input: sdfkdsunkown input: fakdsf

This program works!
```haskell
interaction :: String -> String
interaction "jappie" = "hi \n"
interaction "jakob" = "hello \n"
interaction x = "unkown input: " &lt;> x &lt;> "\n"

main :: IO ()
main = do
  interact  (concatMap interaction . lines)

the reason is that linebuffering is set for both in and output by default.
so lines eats the input lines, and all the \n postfixes make sure the buffer
is put out.

- - - - -
9fa590a6 by Zubin Duggal at 2025-07-17T06:07:03-04:00
fetch_gitlab: Ensure we copy users_guide.pdf and Haddock.pdf to the release docs directory

Fixes #24093

- - - - -
cc650b4b by Andrew Lelechenko at 2025-07-17T12:30:24-04:00
Add Data.List.NonEmpty.mapMaybe

As per https://github.com/haskell/core-libraries-committee/issues/337

- - - - -
360fa82c by Duncan Coutts at 2025-07-17T12:31:14-04:00
base: Deprecate GHC.Weak.Finalize.runFinalizerBatch

https://github.com/haskell/core-libraries-committee/issues/342

- - - - -
f4e8466c by Alan Zimmerman at 2025-07-17T12:31:55-04:00
EPA: Update exact printing based on GHC 9.14 tests

As a result of migrating the GHC ghc-9.14 branch tests to
ghc-exactprint in
https://github.com/alanz/ghc-exactprint/tree/ghc-9.14, a couple of
discrepancies were picked up

- The opening paren for a DefaultDecl was printed in the wrong place
- The import declaration level specifiers were not printed.

This commit adds those fixes, and some tests for them.
The tests brought to light that the ImportDecl ppr instance had not
been updated for level specifiers, so it updates that too.

- - - - -
8b731e3c by Matthew Pickering at 2025-07-21T13:36:43-04:00
level imports: Fix infinite loop with cyclic module imports

I didn't anticipate that downsweep would run before we checked for
cyclic imports. Therefore we need to use the reachability function which
handles cyclic graphs.

Fixes #26087

- - - - -
d751a9f1 by Pierre Thierry at 2025-07-21T13:37:28-04:00
Fix documentation about deriving from generics

- - - - -
f8d9d016 by Andrew Lelechenko at 2025-07-22T21:13:28-04:00
Fix issues with toRational for types capable to represent infinite and not-a-number values

This commit fixes all of the following pitfalls:
...
toRational (read "Infinity" :: Double)
179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216 % 1
toRational (read "NaN" :: Double)
269653970229347386159395778618353710042696546841345985910145121736599013708251444699062715983611304031680170819807090036488184653221624933739271145959211186566651840137298227914453329401869141179179624428127508653257226023513694322210869665811240855745025766026879447359920868907719574457253034494436336205824 % 1
...
realToFrac (read "NaN" :: Double) -- With -O0
Infinity
realToFrac (read "NaN" :: Double) -- With -O1
NaN
...
realToFrac (read "NaN" :: Double) :: CDouble
Infinity
realToFrac (read "NaN" :: CDouble) :: Double
Infinity
Implements https://github.com/haskell/core-libraries-committee/issues/338

- - - - -
5dabc718 by Zubin Duggal at 2025-07-22T21:14:10-04:00
haddock: Don't warn about missing link destinations for derived names.

Fixes #26114

- - - - -
9c3a0937 by Matthew Pickering at 2025-07-22T21:14:52-04:00
template haskell: use a precise condition when implicitly lifting

Implicit lifting corrects a level error by replacing references to `x`
with `$(lift x)`, therefore you can use a level `n` binding at level `n
+ 1`, if it can be lifted.

Therefore, we now have a precise check that the use level is 1 more than
the bind level.

Before this bug was not observable as you only had 0 and 1 contexts but
it is easily evident when using explicit level imports.

Fixes #26088

- - - - -
5144b22f by Andreas Klebinger at 2025-07-22T21:15:34-04:00
Add since tag and more docs for do-clever-arg-eta-expansion

Fixes #26113

- - - - -
c865623b by Andreas Klebinger at 2025-07-22T21:15:34-04:00
Add since tag for -fexpose-overloaded-unfoldings

Fixes #26112

- - - - -
49a44ab7 by Simon Hengel at 2025-07-23T17:59:55+07:00
Refactor GHC.Driver.Errors.printMessages

- - - - -
84711c39 by Simon Hengel at 2025-07-23T18:27:34+07:00
Respect `-fdiagnostics-as-json` for error messages from pre-processors

(fixes #25480)

- - - - -
d046b5ab by Simon Hengel at 2025-07-24T06:12:05-04:00
Include the rendered message in -fdiagnostics-as-json output

This implements #26173.

- - - - -
d2b89603 by Ben Gamari at 2025-07-24T06:12:47-04:00
rts/Interpreter: Factor out ctoi tuple info tables into data

Instead of a massive case let's put this into data which we can reuse
elsewhere.

- - - - -
4bc78496 by Sebastian Graf at 2025-07-24T16:19:34-04:00
CprAnal: Detect recursive newtypes (#25944)

While `cprTransformDataConWork` handles recursive data con workers, it
did not detect the case when a newtype is responsible for the recursion.
This is now detected in the `Cast` case of `cprAnal`.

The same reproducer made it clear that `isRecDataCon` lacked congruent
handling for `AppTy` and `CastTy`, now fixed.

Furthermore, the new repro case T25944 triggered this bug via an
infinite loop in `cprFix`, caused by the infelicity in `isRecDataCon`.
While it should be much less likely to trigger such an infinite loop now
that `isRecDataCon` has been fixed, I made sure to abort the loop after
10 iterations and emitting a warning instead.

Fixes #25944.

- - - - -
0a583689 by Sylvain Henry at 2025-07-24T16:20:26-04:00
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.

- - - - -
a49eca26 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Renaming around predicate types

.. we were (as it turned out) abstracting over
type-class selectors in SPECIALISATION rules!

Wibble isEqPred

- - - - -
f80375dd by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Refactor of Specialise.hs

This patch just tidies up `specHeader` a bit, removing one
of its many results, and adding some comments.

No change in behaviour.

Also add a few more `HasDebugCallStack` contexts.

- - - - -
1bd12371 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Improve treatment of SPECIALISE pragmas -- again!

This MR does another major refactor of the way that SPECIALISE
pragmas work, to fix #26115, #26116, #26117.

* We now /always/ solve forall-constraints in an all-or-nothing way.
  See Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve

  This means we might have unsolved quantified constraints, which need
  to be reported.  See `inert_insts` in `getUnsolvedInerts`.

* I refactored the short-cut solver for type classes to work by
  recursively calling the solver rather than by having a little baby
  solver that kept being not clever enough.
  See Note [Shortcut solving] in GHC.Tc.Solver.Dict

* I totally rewrote the desugaring of SPECIALISE pragmas, again.
  The new story is in Note [Desugaring new-form SPECIALISE pragmas]
  in GHC.HsToCore.Binds

  Both old-form and new-form SPECIALISE pragmas now route through the same
  function `dsSpec_help`.   The tricky function `decomposeRuleLhs` is now used only
  for user-written RULES, not for SPECIALISE pragmas.

* I improved `solveOneFromTheOther` to account for rewriter sets. Previously
  it would solve a non-rewritten dict from a rewritten one.  For equalities
  we were already dealing with this, in

Some incidental refactoring

* A small refactor: `ebv_tcvs` in `EvBindsBar` now has a list of coercions, rather
  than a set of tyvars.  We just delay taking the free vars.

* GHC.Core.FVs.exprFVs now returns /all/ free vars.
  Use `exprLocalFVs` for Local vars.
  Reason: I wanted another variant for /evidence/ variables.

* Ues `EvId` in preference to `EvVar`.  (Evidence variables are always Ids.)
  Rename `isEvVar` to `isEvId`.

* I moved `inert_safehask` out of `InertCans` and into `InertSet` where it
  more properly belongs.

Compiler-perf changes:
  * There was a palpable bug (#26117) which this MR fixes in
    newWantedEvVar, which bypassed all the subtle overlapping-Given
    and shortcutting logic.  (See the new `newWantedEvVar`.)  Fixing this
    but leads to extra dictionary bindings; they are optimised away quickly
    but they made CoOpt_Read allocate 3.6% more.

  * Hpapily T15164 improves.

  * The net compiler-allocation change is 0.0%

Metric Decrease:
    T15164
Metric Increase:
    CoOpt_Read
    T12425

- - - - -
953fd8f1 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Solve forall-constraints immediately, or not at all

This MR refactors the constraint solver to solve forall-constraints immediately,
rather than emitting an implication constraint to be solved later.

The most immediate motivation was that when solving quantified constraints
in SPECIALISE pragmas, we really really don't want to leave behind half-
solved implications.  Also it's in tune with the approach of the new
short-cut solver, which recursively invokes the solver.

It /also/ saves quite a bit of plumbing; e.g

  - The `wl_implics` field of `WorkList` is gone,

  - The types of `solveSimpleWanteds` and friends are simplified.

  - An EvFun contains binding, rather than an EvBindsVar ref-cell that
    will in the future contain bindings.  That makes `evVarsOfTerm`
    simpler.  Much nicer.

It also improves error messages a bit.

All described in Note [Solving a Wanted forall-constraint] in
GHC.Tc.Solver.Solve.

One tiresome point: in the tricky case of `inferConstraintsCoerceBased`
we make a forall-constraint.  This we /do/ want to partially solve, so
we can infer a suitable context. (I'd be quite happy to force the user to
write a context, bt I don't want to change behavior.)  So we want to generate
an /implication/ constraint in `emitPredSpecConstraints` rather than a
/forall-constraint/ as we were doing before.  Discussed in (WFA3) of
the above Note.

Incidental refactoring

* `GHC.Tc.Deriv.Infer.inferConstraints` was consulting the state monad for
  the DerivEnv that the caller had just consulted.  Nicer to pass it as an
  argument I think, so I have done that.  No change in behaviour.

- - - - -
6921ab42 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Remove duplicated code in Ast.hs for evTermFreeVars

This is just a tidy up.

- - - - -
1165f587 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Small tc-tracing changes only

- - - - -
0776ffe0 by Simon Hengel at 2025-07-26T04:54:20-04:00
Respect `-fdiagnostics-as-json` for core diagnostics (see #24113)

- - - - -
cc1116e0 by Andrew Lelechenko at 2025-07-26T04:55:01-04:00
docs: add since pragma to Data.List.NonEmpty.mapMaybe

- - - - -
ee2dc248 by Simon Hengel at 2025-07-31T06:25:35-04:00
Update comments on `OptKind` to reflect the code reality

- - - - -
b029633a by Wen Kokke at 2025-07-31T06:26:21-04:00
rts: Disable --eventlog-flush-interval unless compiled with -threaded.

This commit fixes issue #26222:
Using --eventlog-flush-interval with the non-threaded RTS leads to eventlog corruption.
https://gitlab.haskell.org/ghc/ghc/-/issues/26222

This commit makes three changes when code is compiled against the non-threaded RTS:

1. It disables the --eventlog-flush-interval flag.
2. It disables the documentation for the --eventlog-flush-interval flag.
3. It disables the relevant state from RtsConfig and code from Timer.
4. It updates the entry for --eventlog-flush-interval in the users guide.

- - - - -
31159f1d by Wen Kokke at 2025-07-31T06:26:21-04:00
rts: Split T20006 into tests with and without -threaded

- - - - -
618687ef by Simon Hengel at 2025-07-31T06:27:03-04:00
docs/users_guide/win32-dlls.rst: Remove references to `readline`

- - - - -
083e40f1 by Rodrigo Mesquita at 2025-08-01T04:38:23-04:00
debugger: Uniquely identify breakpoints by internal id

Since b85b11994e0130ff2401dd4bbdf52330e0bcf776 (support inlining
breakpoints), a breakpoint has been identified at runtime by *two* pairs
of <module,index>.

- The first, aka a 'BreakpointId', uniquely identifies a breakpoint in
  the source of a module by using the Tick index. A Tick index can index
  into ModBreaks.modBreaks_xxx to fetch source-level information about
  where that tick originated.

    - When a user specifies e.g. a line breakpoint using :break, we'll reverse
      engineer what a Tick index for that line
    - We update the `BreakArray` of that module (got from the
      LoaderState) at that tick index to `breakOn`.
    - A BCO we can stop at is headed by a BRK_FUN instruction. This
      instruction stores in an operand the `tick index` it is associated
      to. We look it up in the associated `BreakArray` (also an operand)
      and check wheter it was set to `breakOn`.

- The second, aka the `ibi_info_mod` + `ibi_info_ix` of the
  `InternalBreakpointId`, uniquely index into the `imodBreaks_breakInfo`
  -- the information we gathered during code generation about the
  existing breakpoint *ocurrences*.

  - Note that with optimisation there may be many occurrences of the
    same source-tick-breakpoint across different modules. The
    `ibi_info_ix` is unique per occurrence, but the `bi_tick_ix` may be
    shared. See Note [Breakpoint identifiers] about this.

  - Note that besides the tick ids, info ids are also stored in
    `BRK_FUN` so the break handler can refer to the associated
    `CgBreakInfo`.

In light of that, the driving changes come from the desire to have the
info_id uniquely identify the breakpoint at runtime, and the source tick
id being derived from it:

- An InternalBreakpointId should uniquely identify a breakpoint just
  from the code-generation identifiers of `ibi_info_ix` and `ibi_info_mod`.
  So we drop `ibi_tick_mod` and `ibi_tick_ix`.
- A BRK_FUN instruction need only record the "internal breakpoint id",
  not the tick-level id.
  So we drop the tick mod and tick index operands.
- A BreakArray should be indexed by InternalBreakpointId rather than
  BreakpointId

That means we need to do some more work when setting a breakpoint.
Specifically, we need to figure out the internal ids (occurrences of a
breakpoint) from the source-level BreakpointId we want to set the
breakpoint at (recall :break refers to breaks at the source level).

Besides this change being an improvement to the handling of breakpoints
(it's clearer to have a single unique identifier than two competing
ones), it unlocks the possibility of generating "internal" breakpoints
during Cg (needed for #26042).
It should also be easier to introduce multi-threaded-aware `BreakArrays`
following this change (needed for #26064).

Se also the new Note [ModBreaks vs InternalModBreaks]

On i386-linux:

-------------------------
Metric Decrease:
    interpreter_steplocal
-------------------------

- - - - -
bf03bbaa by Simon Hengel at 2025-08-01T04:39:05-04:00
Don't use MCDiagnostic for `ghcExit`

This changes the error message of `ghcExit` from

```
<no location info>: error:
Compilation had errors

```
to
```

Compilation had errors

```

- - - - -
a889ec75 by Simon Hengel at 2025-08-01T04:39:05-04:00
Respect `-fdiagnostics-as-json` for driver diagnostics (see #24113)

- - - - -
81577fe7 by Ben Gamari at 2025-08-02T04:29:39-04:00
configure: Allow override of CrossCompiling

As noted in #26236, the current inference logic is a bit simplistic. In
particular, there are many cases (e.g. building for a new libc) where
the target and host triples may differ yet we are still able to run the
produced artifacts as native code.

Closes #26236.

- - - - -
01136779 by Andreas Klebinger at 2025-08-02T04:30:20-04:00
rts: Support COFF BigObj files in archives.

- - - - -
1f9e4f54 by Stephen Morgan at 2025-08-03T15:14:08+10:00
refactor: Modify Data.List.sortOn to use (>) instead of compare. (#26184)

This lets a more efficient (>) operation be used if one exists.

This is technically a breaking change for malformed Ord instances, where
x > y is not equivalent to compare x y == GT.

Discussed by the CLC in issue #332: https://github.com/haskell/core-libraries-committee/issues/332

- - - - -
4f6bc9cf by fendor at 2025-08-04T17:50:06-04:00
Revert "base: Expose Backtraces constructor and fields"

This reverts commit 17db44c5b32fff82ea988fa4f1a233d1a27bdf57.

- - - - -
bcdec657 by Zubin Duggal at 2025-08-05T10:37:29+05:30
compiler: Export a version of `newNameCache` that is not prone to footguns.
`newNameCache` must be initialized with both a non-"reserved" unique tag, as well
as a list of known key names. Failing to do so results in hard to debug unique conflicts.

It is difficult for API users to tell which unique tags are safe to use. So instead of leaving
this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed
non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations
of the compiler.

The original version of `newNameCache` is now exported as `newNameCache'` for advanced users.

We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in
functionality by `newNameCache` and `newNameCache'`.

Fixes #26135 and #26055

- - - - -
57d3b4a8 by Andrew Lelechenko at 2025-08-05T18:36:31-04:00
hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2

In line with #25693 we should use GHC 9.10 as a boot compiler,
while Hadrian stack.yaml was stuck on GHC 9.6.

- - - - -
c2a78cea by Peng Fan at 2025-08-05T18:37:27-04:00
NCG/LA64: implement atomic write with finer-grained DBAR hints

Signed-off-by: Peng Fan <fanpeng@loongson.cn>

- - - - -
95231c8e by Teo Camarasu at 2025-08-06T08:35:58-04:00
CODEOWNERS: add CLC as codeowner of base

We also remove hvr, since I think he is no longer active
- - - - -
77df0ded by Andrew Lelechenko at 2025-08-06T08:36:39-04:00
Bump submodule text to 2.1.3

- - - - -
8af260d0 by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00
docs: fix internal import in getopt examples

This external-facing doc example shouldn't mention GHC internals when
using 'fromMaybe'.

- - - - -
69cc16ca by Marc Scholten at 2025-08-06T15:51:28-04:00
README: Add note on ghc.nix

- - - - -
93a2f450 by Daniel Díaz at 2025-08-06T15:52:14-04:00
Link to the "Strict Bindings" docs from the linear types docs

Strict Bidings are relevant for the kinds of multiplicity annotations
linear lets support.

- - - - -
246b7853 by Matthew Pickering at 2025-08-07T06:58:30-04:00
level imports: Check the level of exported identifiers

The level imports specification states that exported identifiers have to
be at level 0. This patch adds the requird level checks that all
explicitly mentioned identifiers occur at level 0.

For implicit export specifications (T(..) and module B), only level 0
identifiers are selected for re-export.

ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705

Fixes #26090

- - - - -
358bc4fc by fendor at 2025-08-07T06:59:12-04:00
Bump GHC on darwin CI to 9.10.1

- - - - -
1903ae35 by Matthew Pickering at 2025-08-07T12:21:10+01:00
ipe: Place strings and metadata into specific .ipe section

By placing the .ipe metadata into a specific section it can be stripped
from the final binary if desired.

```
objcopy --remove-section .ipe <binary>
upx <binary>
```

Towards #21766

- - - - -
c80dd91c by Matthew Pickering at 2025-08-07T12:22:42+01:00
ipe: Place magic word at the start of entries in the .ipe section

The magic word "IPE\nIPE\n" is placed at the start of .ipe sections,
then if the section is stripped, we can check whether the section starts
with the magic word or not to determine whether there is metadata
present or not.

Towards #21766

- - - - -
cab42666 by Matthew Pickering at 2025-08-07T12:22:42+01:00
ipe: Use stable IDs for IPE entries

IPEs have historically been indexed and reported by their address.
This makes it impossible to compare profiles between runs, since the
addresses may change (due to ASLR) and also makes it tricky to separate
out the IPE map from the binary.

This small patch adds a stable identifier for each IPE entry.

The stable identifier is a single 64 bit word. The high-bits are a
per-module identifier and the low bits identify which entry in each
module.

1. When a node is added into the IPE buffer it is assigned a unique
   identifier from an incrementing global counter.
2. Each entry already has an index by it's position in the
   `IpeBufferListNode`.

The two are combined together by the `IPE_ENTRY_KEY` macro.

Info table profiling uses the stable identifier rather than the address
of the info table.

The benefits of this change are:

* Profiles from different runs can be easily compared
* The metadata can be extracted from the binary (via the eventlog for
  example) and then stripped from the executable.

Fixes #21766

- - - - -
2860a9a5 by Simon Peyton Jones at 2025-08-07T20:29:18-04:00
In TcSShortCut, typechecker plugins should get empty Givens

Solving in TcShortCut mode means /ignoring the Givens/. So we
should not pass them to typechecker plugins!

Fixes #26258.

This is a fixup to the earlier MR:

    commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Mon Jul 21 10:04:49 2025 +0100

        Improve treatment of SPECIALISE pragmas -- again!

- - - - -
2157db2d by sterni at 2025-08-08T15:32:39-04:00
hadrian: enable terminfo if --with-curses-* flags are given

The GHC make build system used to support WITH_TERMINFO in ghc.mk which
allowed controlling whether to build GHC with terminfo or not. hadrian
has replaced this with a system where this is effectively controlled by
the cross-compiling setting (the default WITH_TERMINFO value was bassed
on CrossCompiling, iirc).

This behavior is undesireable in some cases and there is not really a
good way to work around it. Especially for downstream packagers,
modifying this via UserSettings is not really feasible since such a
source file has to be kept in sync with Settings/Default.hs manually
since it can't import Settings.Default or any predefined Flavour
definitions.

To avoid having to add a new setting to cfg/system.config and/or a new
configure flag (though I'm happy to implement both if required), I've
chosen to take --with-curses-* being set explicitly as an indication
that the user wants to have terminfo enabled. This would work for
Nixpkgs which sets these flags [1] as well as haskell.nix [2] (which
goes to some extreme measures [3] [4] to force terminfo in all scenarios).

In general, I'm an advocate for making the GHC build be the same for
native and cross insofar it is possible since it makes packaging GHC and
Haskell related things while still supporting cross much less
compilicated. A more minimal GHC with reduced dependencies should
probably be a specific flavor, not the default.

Partially addresses #26288 by forcing terminfo to be built if the user
explicitly passes configure flags related to it. However, it isn't built
by default when cross-compiling yet nor is there an explicit way to
control the package being built.

[1]: https://github.com/NixOS/nixpkgs/blob/3a7266fcefcb9ce353df49ba3f292d06443760...
[2]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4...
[3]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4...
[4]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4...

- - - - -
b3c31488 by David Feuer at 2025-08-08T15:33:21-04:00
Add default QuasiQuoters

Add `defaultQuasiQuoter` and `namedDefaultQuasiQuoter` to make it easier
to write `QuasiQuoters` that give helpful error messages when they're
used in inappropriate contexts.

Closes #24434.

- - - - -
03555ed8 by Sylvain Henry at 2025-08-10T22:20:57-04:00
Handle non-fractional CmmFloats in Cmm's CBE (#26229)

Since f8d9d016305be355f518c141f6c6d4826f2de9a2, toRational for Float and
Double converts float's infinity and NaN into Rational's infinity and
NaN (respectively 1%0 and 0%0).

Cmm CommonBlockEliminator hashing function needs to take these values
into account as they can appear as literals now. See added testcase.

- - - - -
6c956af3 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00
Fix extensions list in `DoAndIfThenElse` docs

- - - - -
6dc420b1 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00
Document status of `RelaxedPolyRec` extension

This adds a brief extension page explaining the status of the
`RelaxedPolyRec` extension. The behaviour of this mode is already
explained elsewhere, so this page is mainly for completeness so that
various lists of extensions have somewhere to point to for this flag.

Fixes #18630

- - - - -
18036d52 by Simon Peyton Jones at 2025-08-11T11:31:20-04:00
Take more care in zonkEqTypes on AppTy/AppTy

This patch fixes #26256.

See Note [zonkEqTypes and the PKTI] in GHC.Tc.Solver.Equality

- - - - -
c8d76a29 by Zubin Duggal at 2025-08-11T11:32:02-04:00
ci: upgrade bootstrap compiler on windows to 9.10.1

- - - - -
34fc50c1 by Ben Gamari at 2025-08-11T13:36:25-04:00
Kill IOPort#

This type is unnecessary, having been superceded by `MVar` and a rework
of WinIO's blocking logic.

See #20947.

See https://github.com/haskell/core-libraries-committee/issues/213.

- - - - -
56b32c5a by sheaf at 2025-08-12T10:00:19-04:00
Improve deep subsumption

This commit improves the DeepSubsumption sub-typing implementation
in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back
to unification.

For example, we now are properly able to prove the subtyping relationship

  ((∀ a. a->a) -> Int) -> Bool  <=  β[tau] Bool

for an unfilled metavariable β. In this case (with an AppTy on the right),
we used to fall back to unification. No longer: now, given that the LHS
is a FunTy and that the RHS is a deep rho type (does not need any instantiation),
we try to make the RHS into a FunTy, viz.

  β := (->) γ

We can then continue using covariance & contravariance of the function
arrow, which allows us to prove the subtyping relationship, instead of
trying to unify which would cause us to error out with:

  Couldn't match expected type ‘β’ with actual type ‘(->) ((∀ a. a -> a) -> Int)

See Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.

The other main improvement in this patch concerns type inference.
The main subsumption logic happens (before & after this patch) in
GHC.Tc.Gen.App.checkResultTy. However, before this patch, all of the
DeepSubsumption logic only kicked in in 'check' mode, not in 'infer' mode.

This patch adds deep instantiation in the 'infer' mode of checkResultTy
when we are doing deep subsumption, which allows us to accept programs
such as:

  f :: Int -> (forall a. a->a)
  g :: Int -> Bool -> Bool

  test1 b =
    case b of
      True  -> f
      False -> g
  test2 b =
    case b of
      True  -> g
      False -> f

See Note [Deeply instantiate in checkResultTy when inferring].

Finally, we add representation-polymorphism checks to ensure that the
lambda abstractions we introduce when doing subsumption obey the
representation polymorphism invariants of Note [Representation polymorphism invariants]
in GHC.Core. See Note [FunTy vs FunTy case in tc_sub_type_deep].
This is accompanied by a courtesy change to `(<.>) :: HsWrapper -> HsWrapper -> HsWrapper`,
adding the equation:

  WpCast c1 <.> WpCast c2 = WpCast (c1 `mkTransCo` c2)

This is useful because mkWpFun does not introduce an eta-expansion when
both of the argument & result wrappers are casts; so this change allows
us to avoid introducing lambda abstractions when casts suffice.

Fixes #26225

- - - - -
d175aff8 by Sylvain Henry at 2025-08-12T10:01:31-04:00
Add regression test for #18619

- - - - -
a3983a26 by Sylvain Henry at 2025-08-12T10:02:20-04:00
RTS: remove some TSAN annotations (#20464)

Use RELAXED_LOAD_ALWAYS macro instead.

- - - - -
0434af81 by Ben Gamari at 2025-08-12T10:03:02-04:00
Bump time submodule to 1.15

Also required bumps of Cabal, directory, and hpc.

- - - - -
62899117 by Florian Ragwitz at 2025-08-13T21:01:34-04:00
Extend record-selector usage ticking to all binds using a record field

This extends the previous handling of ticking for RecordWildCards and
NamedFieldPuns to all var bindings that involve record selectors.

Note that certain patterns such as `Foo{foo = 42}` will currently not tick the
`foo` selector, as ticking is triggered by `HsVar`s.

Closes #26191.

- - - - -
b37b3af7 by Florian Ragwitz at 2025-08-13T21:01:34-04:00
Add release notes for 9.16.1 and move description of latest HPC changes there.

- - - - -
a5e4b7d9 by Ben Gamari at 2025-08-13T21:02:18-04:00
rts: Clarify rationale for undefined atomic wrappers

Since c06e3f46d24ef69f3a3d794f5f604cb8c2a40cbc the RTS has declared
various atomic operation wrappers defined by ghc-internal as undefined.
While the rationale for this isn't clear from the commit message, I
believe that this is necessary due to the unregisterised backend.
Specifically, the code generator will reference these symbols when
compiling RTS Cmm sources.

- - - - -
50842f83 by Andreas Klebinger at 2025-08-13T21:03:01-04:00
Make unexpected LLVM versions a warning rather than an error.

Typically a newer LLVM version *will* work so erroring out if
a user uses a newer LLVM version is too aggressive.

Fixes #25915

- - - - -
c91e2650 by fendor at 2025-08-13T21:03:43-04:00
Store `StackTrace` and `StackSnapshot` in `Backtraces`

Instead of decoding the stack traces when collecting the `Backtraces`,
defer this decoding until actually showing the `Backtraces`.
This allows users to customise how `Backtraces` are displayed by
using a custom implementation of `displayExceptionWithInfo`, overwriting
the default implementation for `Backtraces` (`displayBacktraces`).

- - - - -
dee28cdd by fendor at 2025-08-13T21:03:43-04:00
Allow users to customise the collection of exception annotations

Add a global `CollectExceptionAnnotationMechanism` which determines how
`ExceptionAnnotation`s are collected upon throwing an `Exception`.

This API is exposed via `ghc-experimental`.

By overriding how we collect `Backtraces`, we can control how the
`Backtraces` are displayed to the user by newtyping `Backtraces` and
giving a different instance for `ExceptionAnnotation`.

A concrete use-case for this feature is allowing us to experiment with
alternative stack decoders, without having to modify `base`, which take
additional information from the stack frames.

This commit does not modify how `Backtraces` are currently
collected or displayed.

- - - - -
66024722 by fendor at 2025-08-13T21:03:43-04:00
Expose Backtraces internals from ghc-experimental

Additionally, expose the same API `base:Control.Exception.Backtrace`
to make it easier to use as a drop-in replacement.

- - - - -
a766286f by Reed Mullanix at 2025-08-13T21:04:36-04:00
ghc-internal: Fix naturalAndNot for NB/NS case

When the first argument to `naturalAndNot` is larger than a `Word` and the second is `Word`-sized, `naturalAndNot` will truncate the
result:

```
...
...
...
naturalAndNot ((2 ^ 65) .|. (2 ^ 3)) (2 ^ 3)
0

In contrast, `naturalAndNot` does not truncate when both arguments are larger than a `Word`, so this appears to be a bug.
Luckily, the fix is pretty easy: we just need to call `bigNatAndNotWord#` instead of truncating.

Fixes #26230

- - - - -
3506fa7d by Simon Hengel at 2025-08-13T21:05:18-04:00
Report -pgms as a deprecated flag

(instead of reporting an unspecific warning)

Before:

    on the commandline: warning:
        Object splitting was removed in GHC 8.8

After:

    on the commandline: warning: [GHC-53692] [-Wdeprecated-flags]
        -pgms is deprecated: Object splitting was removed in GHC 8.8

- - - - -
51c701fe by Zubin Duggal at 2025-08-13T21:06:00-04:00
testsuite: Be more permissive when filtering out GNU_PROPERTY_TYPE linker warnings

The warning text is slightly different with ld.bfd.

Fixes #26249

- - - - -
dfe6f464 by Simon Hengel at 2025-08-13T21:06:43-04:00
Refactoring: Don't misuse `MCDiagnostic` for lint messages

`MCDiagnostic` is meant to be used for compiler diagnostics.

Any code that creates `MCDiagnostic` directly, without going through
`GHC.Driver.Errors.printMessage`, side steps `-fdiagnostics-as-json`
(see e.g. !14475, !14492 !14548).

To avoid this in the future I want to control more narrowly who creates
`MCDiagnostic` (see #24113).

Some parts of the compiler use `MCDiagnostic` purely for formatting
purposes, without creating any real compiler diagnostics.  This change
introduces a helper function, `formatDiagnostic`, that can be used in
such cases instead of constructing `MCDiagnostic`.

- - - - -
a8b2fbae by Teo Camarasu at 2025-08-13T21:07:24-04:00
rts: ensure MessageBlackHole.link is always a valid closure

We turn a MessageBlackHole into an StgInd in wakeBlockingQueue().
Therefore it's important that the link field, which becomes the
indirection field, always points to a valid closure.

It's unclear whether it's currently possible for the previous behaviour
to lead to a crash, but it's good to be consistent about this invariant nonetheless.

Co-authored-by: Andreas Klebinger &lt;klebinger.andreas@gmx.at>

- - - - -
4021181e by Teo Camarasu at 2025-08-13T21:07:24-04:00
rts: spin if we see a WHITEHOLE in messageBlackHole

When a BLACKHOLE gets cancelled in raiseAsync, we indirect to a THUNK.
GC can then shortcut this, replacing our BLACKHOLE with a fresh THUNK.

This THUNK is not guaranteed to have a valid indirectee field.

If at the same time, a message intended for the previous BLACKHOLE is
processed and concurrently we BLACKHOLE the THUNK, thus temporarily
turning it into a WHITEHOLE, we can get a segfault, since we look at the
undefined indirectee field of the THUNK

The fix is simple: spin if we see a WHITEHOLE, and it will soon be
replaced with a valid BLACKHOLE.

Resolves #26205

- - - - -
1107af89 by Oleg Grenrus at 2025-08-13T21:08:06-04:00
Allow defining HasField instances for naughty fields

Resolves #26295

... as HasField solver doesn't solve for fields with "naughty"
selectors, we could as well allow defining HasField instances for these
fields.

- - - - -
020e7587 by Sylvain Henry at 2025-08-13T21:09:00-04:00
Fix Data.List unqualified import warning

- - - - -
fd811ded by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Make injecting implicit bindings into its own pass

Previously we were injecting "impliicit bindings" (data constructor
worker and wrappers etc)

  - both at the end of CoreTidy,
  - and at the start of CorePrep

This is unpleasant and confusing.  This patch puts it it its own pass,
addImplicitBinds, which runs between the two.

The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/
TyCons, not just the ones for algebraic data types.  That change ripples
through to
     - corePrepPgm
     - doCodeGen
     - byteCodeGen
All take [TyCon] which includes all TyCons

- - - - -
9bd7fcc5 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Implement unary classes

The big change is described exhaustively in

   Note [Unary class magic] in GHC.Core.TyCon

Other changes

* We never unbox class dictionaries in worker/wrapper.  This has been true for some
  time now, but the logic is now centralised in functions in
  GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg`
  See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils.

* Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels.
  I can't remember if I actually changed any behaviour here, but if so it's
  only in a corner cases.

* Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning
  True for (##).

* Remove redundant Role argument to `liftCoSubstWithEx`.  It was always
  Representational.

* I refactored evidence generation in the constraint solver:
  * Made GHC.Tc.Types.Evidence contain better abstactions for evidence
    generation.
  * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents
    elsewhere. It wasn't paying its way.
  * Made evidence for implicit parameters go via a proper abstraction.

* Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk]
  This fixes a slowdown in `countdownEffectfulDynLocal`
  in the `effectful` library.

Smaller things

* Rename `isDataTyCon` to `isBoxedDataTyCon`.
* GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role,
  so I baked that into the function and removed the argument.
* Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling
  `not isNewTyCon` at the call sites; more explicit.
* Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its
  behaviour
* Moved `decomposeIPPred` to GHC.Core.Predicate

Compile time performance changes:
  geo. mean        +0.1%
    minimum        -6.8%
    maximum       +14.4%

The +14% one is in T21839c, where it seems that a bit more inlining
is taking place.  That seems acceptable; and the average change is small

Metric Decrease:
    LargeRecord
    T12227
    T12707
    T16577
    T21839r
    T5642
Metric Increase:
    T15164
    T21839c
    T3294
    T5321FD
    T5321Fun
    WWRec

- - - - -
b4075d71 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Slight improvement to pre/postInlineUnconditionally

Avoids an extra simplifier iteration

- - - - -
9e443596 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Fix a long-standing assertion error in normSplitTyConApp_maybe

- - - - -
91310ad0 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Add comment to coercion optimiser

- - - - -
5b841d82 by Teo Camarasu at 2025-08-14T17:57:56-04:00
template-haskell: move some identifiers from ghc-internal to template-haskell

These identifiers are not used internally by the compiler. Therefore we
have no reason for them to be in ghc-internal.

By moving them to template-haskell, we benefit from it being easier to
change them and we avoid having to build them in stage0.

Resolves #26048

- - - - -
33e2c7e5 by Teo Camarasu at 2025-08-14T17:57:56-04:00
template-haskell: transfer $infix note to public module

This Haddock note should be in the public facing module

- - - - -
2a411fc4 by Sylvain Henry at 2025-08-14T17:59:09-04:00
JS: export HEAP8 symbol (#26290)

Newer Emscripten requires this.

- - - - -
248f78ca by Ben Gamari at 2025-08-14T17:59:51-04:00
users-guide: Drop the THREAD_RUNNABLE event

As of f361281c89fbce42865d8b8b27b0957205366186 it is no longer emitted.
- - - - -
706d33e3 by Recursion Ninja at 2025-08-15T04:12:12-04:00
Resolving issues #20645 and #26109

Correctly sign extending and casting smaller bit width types for LLVM operations:

  - bitReverse8#
  - bitReverse16#
  - bitReverse32#
  - byteSwap16#
  - byteSwap32#
  - pdep8#
  - pdep16#
  - pext8#
  - pext16#

- - - - -
1cdc6f46 by Cheng Shao at 2025-08-15T04:12:56-04:00
hadrian: enforce have_llvm=False for wasm32/js

This patch fixes hadrian to always pass have_llvm=False to the
testsuite driver for wasm32/js targets. These targets don't really
support the LLVM backend, and the optllvm test way doesn't work. We
used to special-case wasm32/js to avoid auto-adding optllvm way in
testsuite/config/ghc, but this is still problematic if someone writes
a new LLVM-related test and uses something like when(have_llvm(),
extra_ways(["optllvm"])). So better just enforce have_llvm=False for
these targets here.

- - - - -
ca03226d by Ben Gamari at 2025-08-18T13:43:20+00:00
configure: Allow use of LLVM 20
- - - - -
783cd7d6 by Cheng Shao at 2025-08-18T20:13:14-04:00
compiler: use `UniqMap` instead of `Map` for `BCEnv` in bytecode compiler

The bytecode compiler maintains a `BCEnv` which was previously `Map Id
StackDepth`. Given `Id` is `Uniquable`, we might as well use `UniqMap`
here as a more efficient data structure, hence this patch.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
58e46da9 by fendor at 2025-08-18T20:13:56-04:00
rts: Strip lower three bits when hashing Word instead of lower eight bits

- - - - -
45dbfa23 by Cheng Shao at 2025-08-18T20:14:37-04:00
libffi: update to 3.5.2

Bumps libffi submodule.

- - - - -
54be78ef by Ben Gamari at 2025-08-19T16:28:05-04:00
testsuite: Fix T20006b

This test is supposed to fail for non-threaded ways yet it
was previously marked as only failing in `normal`.
Fix this.
- - - - -
f4bac607 by Simon Peyton Jones at 2025-08-19T16:28:47-04:00
Take yet more care with reporting redundant constraints

This small patch fixes #25992, which relates to reporting redundant
constraints on default-method declarations.

See (TRC5) in Note [Tracking redundant constraints]

- - - - -
ab130fec by fendor at 2025-08-19T16:29:29-04:00
Bump dependencies of hadrian-bootstrap-gen to use GHC 9.6.7

- - - - -
6d02ac6f by fendor at 2025-08-19T16:29:29-04:00
Bump required GHC version for test-bootstrap jobs to 9.10.1

Include test-bootstrap job for GHC 9.12.2.

Update hadrian bootstrap plans use GHC 9.10 and 9.12

Remove older GHC bootstrap configurations.
We require at least GHC 9.10.1 to build GHC.

Adds plans for:

* 9.10.1
* 9.10.2
* 9.12.1
* 9.12.2

- - - - -
9e857171 by Brandon Chinn at 2025-08-20T11:47:46-04:00
Don't warn unused-imports with used generated imports

Fixes #21730

* The old notion of "implicit" import has been renamed to "generated". See Note [Generated imports] in GHC.Hs.ImpExp.

* ImportMap now keeps track of generated and user-written imports separately. This avoids the fake SrcSpan we used to give the implicit Prelude import, and the hack that went with it.

* -ddump-minimal-imports now considers generated imports (but still only
  warns on + prints user-written imports)

* bestImport considers generated imports to take priority over user-written imports.

- - - - -
9fb3bad4 by Ben Gamari at 2025-08-20T11:48:31-04:00
mailmap: Use ben@well-typed.com more liberally

Nearly all of this work was done while working for Well-Typed.

- - - - -
774fec37 by Ben Gamari at 2025-08-20T11:49:15-04:00
Add primop to annotate the call stack with arbitrary data

We introduce a new primop `annotateStack#` which allows us to push
arbitrary data onto the call-stack.
This allows us to extract the data later when decoding the stack, for
example when an exception is thrown, showing more information to the
user without having to annotate the full call-stack with `HasCallStack`
constraints.

A new stack frame value is introduced `AnnFrame`, which consists of
nothing but a generic payload.

The primop has a small wrapper API that allows users to annotate their
call-stack in programs.
There is a pure API and an IO-based one. The former is a little bit
dubious, as it affects the evaluation of a program, so use with care.
The latter is "safe", as it doesn't change the evaluation of the
program.

The stack annotation mechanism is similarly implemented to the
`ExceptionAnnotation` and `Exception`, there is a typeclass to indicate
something can be pushed onto the call-stack and all values are wrapped
in the existential `SomeStackAnnotation`, which recover the type of the
annotation payload.

There is currently no builtin way to show the stack annotations when
`Backtraces` are displayed (i.e., when showing stack traces to the user),
which we will address in a follow-up MR.

-------------------------
Metric Increase:
    ghc_experimental_so
-------------------------

We increase the size of the package, so this is not unreasonable.

Co-Authored-By: fendor &lt;fendor@posteo.de>
Co-Authored-By: Ben Gamari &lt;bgamari.foss@gmail.com>

- - - - -
fdfa3892 by Ben Gamari at 2025-08-20T11:49:57-04:00
testsuite: Add regression test for #24606

- - - - -
39b2e382 by Cheng Shao at 2025-08-20T11:50:40-04:00
compiler: only use `Name` instead of `Id` in `SptEntry`

As a part of #26298, this patch refactors `SptEntry` to only carry a
`Name` instead of `Id`: we do not care about extra information like
caffyness or type at all in any static pointer related codegen logic.
This is necessary to make `SptEntry` serializable, as a part of the
grand plan of serializable bytecode.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
276f8ea8 by Vekhir -- at 2025-08-20T11:51:35-04:00
Bump Cabal dependency
- - - - -
0b9c7437 by Zubin Duggal at 2025-08-20T11:52:18-04:00
ci: Teach ci.sh to fetch FreeBSD artifacts from ghcup unofficial bindists and bootstrap compiler on FreeBSD to 9.10.1

Also refactor fetch_ghc logic in ci.sh, renaming the GHC_VERSION enviorment configuration variable to FETCH_GHC_VERSION,
making it clear that it is intended for use on platforms like Windows and FreeBSD where we don't want to use the GHC
excecutable from the platform environment and instead need to download and install GHC-$FETCH_GHC_VERSION from a release
bindist.

Fixes #26296

- - - - -
b2914797 by Cheng Shao at 2025-08-20T11:53:00-04:00
driver: use UniqSet for hiddenModules in DynFlags/FinderOpts

This patch replaces Set ModuleName with UniqSet ModuleName in
DynFlags.hiddenModules and FinderOpts.finder_hiddenModules for
improved efficiency.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
0335d899 by Cheng Shao at 2025-08-20T11:53:00-04:00
driver: use UniqMap ModuleName in the finder

This patch replaces Map ModuleName with UniqMap ModuleName in the
finder for improved efficiency.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
91f4faaa by Cheng Shao at 2025-08-20T11:53:43-04:00
configure: check python3 version and require minimal 3.7

Since !9515, the testsuite driver requires python3 version to be at
least 3.7, though this has never been checked by configure logic. This
patch implements the version check. Fixes #23234.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
df4ee9b4 by Cheng Shao at 2025-08-20T11:54:25-04:00
compiler: use zero cost coerce in GHC.CmmToAsm.CFG.loopInfo

This patch refactors GHC.CmmToAsm.CFG.loopInfo to use zero cost coerce
and thus addresses the TODO. For coerce to work, constructors of
Label/LabelMap/LabelSet from GHC.Cmm.Dataflow.Label are exposed,
though I believe it's a worthy tradeoff to avoid unnecessary runtime
cost without using unsafeCoerce, since the latter could be a landmine
for future refactoring.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
ccda188d by Simon Peyton Jones at 2025-08-20T11:55:07-04:00
Start with empty inerts in shortcut solving

When short-cut solving we were starting with an inert set that had
unsolved Wanteds.  This caused an infinite loop (#26314), because a
typechecker plugin kept being given that unsolved Wanted.

It's better just to start with an empty inert set

- - - - -
c8882ed7 by Ben Gamari at 2025-08-20T11:55:49-04:00
configure: Bump minimal bootstrap GHC version to 9.8
- - - - -
f0a19d74 by fendor at 2025-08-20T19:55:00-04:00
Remove deprecated functions from the ghci package

- - - - -
ebeb991b by fendor at 2025-08-20T19:55:00-04:00
base: Remove unstable heap representation details from GHC.Exts

- - - - -
e368e247 by Rodrigo Mesquita at 2025-08-20T19:55:42-04:00
bytecode: Use 32bits for breakpoint index

Fixes #26325

- - - - -
42724462 by Simon Hengel at 2025-08-21T17:52:11-04:00
Serialize wired-in names as external names when creating HIE files

Note that the domain of de-serialized names stays the same.
Specifically, for known-key names, before `lookupKnownKeyName` was used,
while now this is handled by `lookupOrigNameCache` which captures the
same range provided that the OrigNameCache has been initialized with
`knownKeyNames` (which is the case by default).

(fixes #26238)

- - - - -
6a43f8ec by Cheng Shao at 2025-08-21T17:52:52-04:00
compiler: fix closure C type in SPT init code

This patch fixes the closure C type in SPT init code to StgClosure,
instead of the previously incorrect StgPtr. Having an incorrect C type
makes SPT init code not compatible with other foreign stub generation
logic, which may also emit their own extern declarations for the same
closure symbols and thus will clash with the incorrect prototypes in
SPT init code.

- - - - -
5b5d9d47 by Ben Gamari at 2025-08-25T14:29:35-04:00
Revert "STM: don't create a transaction in the rhs of catchRetry# (#26028)"

This reverts commit 0a5836891ca29836a24c306d2a364c2e4b5377fd
- - - - -
10f06163 by Cheng Shao at 2025-08-25T14:30:16-04:00
wasm: ensure setKeepCAFs() is called in ghci

This patch is a critical bugfix for #26106, see comment and linked
issue for details.

- - - - -
bedc1004 by Cheng Shao at 2025-08-26T09:31:18-04:00
compiler: use zero cost coerce in hoopl setElems/mapToList

This patch is a follow-up of !14680 and changes setElems/mapToList in
GHC/Cmm/Dataflow/Label to use coerce instead of mapping mkHooplLabel
over the keys.

- - - - -
13250d97 by Ryan Scott at 2025-08-26T09:31:59-04:00
Reject infix promoted data constructors without DataKinds

In the rename, make sure to apply the same `DataKinds` checks for both
`HsTyVar` (for prefix promoted data constructors) and `HsOpTy` (for infix
promoted data constructors) alike.

Fixes #26318.

- - - - -
37655c46 by Teo Camarasu at 2025-08-26T15:24:51-04:00
tests: disable T22859 under LLVM

This test was failing under the LLVM backend since the allocations
differ from the NCG.

Resolves #26282

- - - - -
2cbba9d6 by Teo Camarasu at 2025-08-26T15:25:33-04:00
base-exports: update version numbers

As the version of the compiler has been bumped, a lot of the embedded
version numbers will need to be updated if we ever run this test with
`--test-accept` so let's just update them now, and keep future diffs
clean.

- - - - -
f9f2ffcf by Alexandre Esteves at 2025-08-27T07:19:14-04:00
Import new name for 'utimbuf' on windows to fix #26337

Fixes an `-Wincompatible-pointer-types` instance that turns into an error on
recent toolchains and surfaced as such on nixpkgs when doing linux->ucrt cross.

This long-standing warning has been present at least since 9.4:

C:\GitLabRunner\builds\0\1709189\tmp\ghc16652_0\ghc_4.c:26:115: error:
     warning: incompatible pointer types passing 'struct utimbuf *' to parameter of type 'struct _utimbuf *' [-Wincompatible-pointer-types]
   |
26 | HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);}

   |                                                                                                                   ^
HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);}
                                                                                                                  ^~

C:\GitLabRunner\builds\0\1709189\_build\stage0\lib\..\..\mingw\x86_64-w64-mingw32\include\sys\utime.h:109:72: error:
     note: passing argument to parameter '_Utimbuf' here
    |
109 | __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) {
    |                                                                        ^
__CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) {
```

- - - - -
ae89f000 by Hassan Al-Awwadi at 2025-08-27T07:19:56-04:00
Adds the fucnction addDependentDirectory to Q, resolving issue #26148.

This function adds a new directory to the list of things a module depends upon. That means that when the contents of the directory change, the recompilation checker will notice this and the module will be recompiled. Documentation has also been added for addDependentFunction and addDependentDirectory in the user guide.

- - - - -
00478944 by Simon Peyton Jones at 2025-08-27T16:48:30+01:00
Comments only

- - - - -
a7884589 by Simon Peyton Jones at 2025-08-28T11:08:23+01:00
Type-family occurs check in unification

The occurs check in `GHC.Core.Unify.uVarOrFam` was inadequate in dealing
with type families.

Better now.  See Note [The occurs check in the Core unifier].

As I did this I realised that the whole apartness thing is trickier than I
thought: see the new Note [Shortcomings of the apartness test]

- - - - -
8adfc222 by sheaf at 2025-08-28T19:47:17-04:00
Fix orientation in HsWrapper composition (<.>)

This commit fixes the order in which WpCast HsWrappers are composed,
fixing a bug introduced in commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1.

Fixes #26350

- - - - -
eb2ab1e2 by Oleg Grenrus at 2025-08-29T11:00:53-04:00
Generalise thNameToGhcName by adding HasHscEnv

There were multiple single monad-specific `getHscEnv` across codebase.
HasHscEnv is modelled on HasDynFlags.

My first idea was to simply add thNameToGhcNameHsc and
thNameToGhcNameTc, but those would been exactly the same
as thNameToGhcName already.

Also add an usage example to thNameToGhcName and mention that it's
recommended way of looking up names in GHC plugins

- - - - -
2d575a7f by fendor at 2025-08-29T11:01:36-04:00
configure: Bump minimal bootstrap GHC version to 9.10

- - - - -
716274a5 by Simon Peyton Jones at 2025-08-29T17:27:12-04:00
Fix deep subsumption again

This commit fixed #26255:

    commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1
    Author: sheaf <sam.derbyshire@gmail.com>
    Date:   Mon Aug 11 15:50:47 2025 +0200

        Improve deep subsumption

        This commit improves the DeepSubsumption sub-typing implementation
        in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back
        to unification.

But alas it still wasn't quite right for view patterns: #26331

This MR does a generalisation to fix it.  A bit of a sledgehammer to crack
a nut, but nice.

* Add a field `ir_inst :: InferInstFlag` to `InferResult`, where
  ```
  data InferInstFlag = IIF_Sigma | IIF_ShallowRho | IIF_DeepRho
  ```

* The flag says exactly how much `fillInferResult` should instantiate
  before filling the hole.

* We can also use this to replace the previous very ad-hoc `tcInferSigma`
  that was used to implement GHCi's `:type` command.

- - - - -
27206c5e by sheaf at 2025-08-29T17:28:14-04:00
Back-compat for TH SpecialiseP data-con of Pragma

This commit improves the backwards-compatibility story for the
SpecialiseP constructor of the Template Haskell 'Pragma' datatype.

Instead of keeping the constructor but deprecating it, this commit makes
it into a bundled pattern synonym of the Pragma datatype. We no longer
deprecate it; it's useful for handling old-form specialise pragmas.

- - - - -
26dbcf61 by fendor at 2025-08-30T05:10:08-04:00
Move stack decoding logic from ghc-heap to ghc-internal

The stack decoding logic in `ghc-heap` is more sophisticated than the one
currently employed in `CloneStack`. We want to use the stack decoding
implementation from `ghc-heap` in `base`.
We cannot simply depend on `ghc-heap` in `base` due do bootstrapping
issues.
Thus, we move the code that is necessary to implement stack decoding to
`ghc-internal`. This is the right location, as we don't want to add a
new API to `base`.

Moving the stack decoding logic and re-exposing it in ghc-heap is
insufficient, though, as we have a dependency cycle between.

* ghc-heap depends on stage1:ghc-internal
* stage0:ghc depends on stage0:ghc-heap

To fix this, we remove ghc-heap from the set of `stage0` dependencies.

This is not entirely straight-forward, as a couple of boot dependencies,
such as `ghci` depend on `ghc-heap`.
Luckily, the boot compiler of GHC is now >=9.10, so we can migrate `ghci`
to use `ghc-internal` instead of `ghc-heap`, which already exports the
relevant modules.

However, we cannot 100% remove ghc's dependency on `ghc-heap`, since
when we compile `stage0:ghc`, `stage1:ghc-internal` is not yet
available.
Thus, when we compile with the boot-compiler, we still depend on an
older version of `ghc-heap`, and only use the modules from `ghc-internal`,
if the `ghc-internal` version is recent enough.

-------------------------
Metric Increase:
    T24602_perf_size
    T25046_perf_size_gzip
    T25046_perf_size_unicode
    T25046_perf_size_unicode_gzip
    size_hello_artifact
    size_hello_artifact_gzip
    size_hello_unicode
    size_hello_unicode_gzip
-------------------------

These metric increases are unfortunate, they are most likely caused by
the larger (literally in terms of lines of code) stack decoder implementation
that are now linked into hello-word binaries.

On linux, it is almost a 10% increase, which is considerable.

- - - - -
bd80bb70 by fendor at 2025-08-30T05:10:08-04:00
Implement `decode` in terms of `decodeStackWithIpe`

Uses the more efficient stack decoder implementation.

- - - - -
24441165 by fendor at 2025-08-30T05:10:08-04:00
Remove stg_decodeStackzh

- - - - -
fb9cc882 by Simon Peyton Jones at 2025-08-30T05:10:51-04:00
Fix a long standing bug in the coercion optimiser

We were mis-optimising ForAllCo, leading to #26345

Part of the poblem was the tricky tower of abstractions leading to
the dreadful
   GHC.Core.TyCo.Subst.substForAllCoTyVarBndrUsing
This function was serving two masters: regular substitution, but also
coercion optimsation.  So tricky was it that it did so wrong.

In this MR I locate all the fancy footwork for coercion optimisation
in GHC.Core.Coercion.Opt, where it belongs.   That leaves substitution
free to be much simpler.

- - - - -
6c78de2d by Sylvain Henry at 2025-09-01T08:46:19-04:00
Driver: substitute virtual Prim module in --make mode too

When we build ghc-internal with --make (e.g. with cabal-install), we
need to be careful to substitute the virtual interface file for
GHC.Internal.Prim:
- after code generation (we generate code for an empty module, so we get
  an empty interface)
- when we try to reload its .hi file

- - - - -
26e0db16 by fendor at 2025-09-01T08:47:01-04:00
Expose Stack Annotation frames in IPE backtraces by default

When decoding the Haskell-native call stack and displaying the IPE information
for the stack frames, we print the `StackAnnotation` of the `AnnFrame` by default.

This means, when an exception is thrown, any intermediate stack annotations will
be displayed in the `IPE Backtrace`.

Example backtrace:
```
Exception: ghc-internal:GHC.Internal.Exception.ErrorCall:

Oh no!

IPE backtrace:
  annotateCallStackIO, called at app/Main.hs:48:10 in backtrace-0.1.0.0-inplace-server:Main
  annotateCallStackIO, called at app/Main.hs:46:13 in backtrace-0.1.0.0-inplace-server:Main
  Main.handler (app/Main.hs:(46,1)-(49,30))
  Main.liftIO (src/Servant/Server/Internal/Handler.hs:30:36-42)
  Servant.Server.Internal.Delayed.runHandler' (src/Servant/Server/Internal/Handler.hs:27:31-41)
  Control.Monad.Trans.Resource.runResourceT (./Control/Monad/Trans/Resource.hs:(192,14)-(197,18))
  Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:195:20-22)
  Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:(195,5)-(203,31))
  Network.Wai.Handler.Warp.HTTP1.http1server.loop (./Network/Wai/Handler/Warp/HTTP1.hs:(141,9)-(157,42))
HasCallStack backtrace:
  error, called at app/Main.hs:48:32 in backtrace-0.1.0.0-inplace-server:Main
```

The first two entries have been added by `annotateCallStackIO`, defined in `annotateCallStackIO`.

- - - - -
a1567efd by Sylvain Henry at 2025-09-01T23:01:35-04:00
RTS: rely less on Hadrian for flag setting (#25843)

Hadrian used to pass -Dfoo command-line flags directly to build the rts.
We can replace most of these flags with CPP based on cabal flags.
It makes building boot libraries with cabal-install simpler (cf #25843).

- - - - -
ca5b0283 by Sergey Vinokurov at 2025-09-01T23:02:23-04:00
Remove unnecessary irrefutable patterns from Bifunctor instances for tuples

Implementation of https://github.com/haskell/core-libraries-committee/issues/339

Metric Decrease:
    mhu-perf

- - - - -
2da84b7a by sheaf at 2025-09-01T23:03:23-04:00
Only use active rules when simplifying rule RHSs

When we are simplifying the RHS of a rule, we make sure to only apply
rewrites from rules that are active throughout the original rule's
range of active phases.

For example, if a rule is always active, we only fire rules that are
themselves always active when simplifying the RHS. Ditto for inline
activations.

This is achieved by setting the simplifier phase to a range of phases,
using the new SimplPhaseRange constructor. Then:

  1. When simplifying the RHS of a rule, or of a stable unfolding,
     we set the simplifier phase to a range of phases, computed from
     the activation of the RULE/unfolding activation, using the
     function 'phaseFromActivation'.

     The details are explained in Note [What is active in the RHS of a RULE?]
     in GHC.Core.Opt.Simplify.Utils.

  2. The activation check for other rules and inlinings is then:
     does the activation of the other rule/inlining cover the whole
     phase range set in sm_phase? This continues to use the 'isActive'
     function, which now accounts for phase ranges.

On the way, this commit also moves the exact-print SourceText annotation
from the Activation datatype to the ActivationAnn type. This keeps the
main Activation datatype free of any extra cruft.

Fixes #26323

- - - - -
79816cc4 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
cleanup: Move dehydrateCgBreakInfo to Stg2Bc

This no longer has anything to do with Core.

- - - - -
53da94ff by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
rts/Disassembler: Fix spacing of BRK_FUN

- - - - -
08c0cf85 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
debugger: Fix bciPtr in Step-out

We need to use `BCO_NEXT` to move bciPtr to ix=1, because ix=0 points to
the instruction itself!

I do not understand how this didn't crash before.

- - - - -
e7e021fa by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
debugger: Allow BRK_FUNs to head case continuation BCOs

When we start executing a BCO, we may want to yield to the scheduler:
this may be triggered by a heap/stack check, context switch, or a
breakpoint. To yield, we need to put the stack in a state such that
when execution is resumed we are back to where we yielded from.

Previously, a BKR_FUN could only head a function BCO because we only
knew how to construct a valid stack for yielding from one -- simply add
`apply_interp_info` + the BCO to resume executing. This is valid because
the stack at the start of run_BCO is headed by that BCO's arguments.

However, in case continuation BCOs (as per Note [Case continuation BCOs]),
we couldn't easily reconstruct a valid stack that could be resumed
because we dropped too soon the stack frames regarding the value
returned (stg_ret) and received (stg_ctoi) by that continuation.
This is especially tricky because of the variable type and size return
frames (e.g. pointer ret_p/ctoi_R1p vs a tuple ret_t/ctoi_t2).

The trick to being able to yield from a BRK_FUN at the start of a case
cont BCO is to stop removing the ret frame headers eagerly and instead
keep them until the BCO starts executing. The new layout at the start of
a case cont. BCO is described by the new Note [Stack layout when entering run_BCO].

Now, we keep the ret_* and ctoi_* frames when entering run_BCO.
A BRK_FUN is then executed if found, and the stack is yielded as-is with
the preserved ret and ctoi frames.
Then, a case cont BCO's instructions always SLIDE off the headers of the
ret and ctoi frames, in StgToByteCode.doCase, turning a stack like

   |     ....      |
   +---------------+
   |     fv2       |
   +---------------+
   |     fv1       |
   +---------------+
   |     BCO       |
   +---------------+
   | stg_ctoi_ret_ |
   +---------------+
   |    retval     |
   +---------------+
   | stg_ret_..... |
   +---------------+

into

   |     ....      |
   +---------------+
   |     fv2       |
   +---------------+
   |     fv1       |
   +---------------+
   |    retval     |
   +---------------+

for the remainder of the BCO.

Moreover, this more uniform approach of keeping the ret and ctoi frames
means we need less ad-hoc logic concerning the variable size of
ret_tuple vs ret_p/np frames in the code generator and interpreter:
Always keep the return to cont. stack intact at the start of run_BCO,
and the statically generated instructions will take care of adjusting
it.

Unlocks BRK_FUNs at the start of case cont. BCOs which will enable a
better user-facing step-out (#26042) which is free of the bugs the
current BRK_ALTS implementation suffers from (namely, using BRK_FUN
rather than BRK_ALTS in a case cont. means we'll never accidentally end
up in a breakpoint "deeper" than the continuation, because we stop at
the case cont itself rather than on the first breakpoint we evaluate
after it).

- - - - -
ade3c1e6 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
BRK_FUN with InternalBreakLocs for code-generation time breakpoints

At the start of a case continuation BCO, place a BRK_FUN.
This BRK_FUN uses the new "internal breakpoint location" -- allowing us
to come up with a valid source location for this breakpoint that is not associated with a source-level tick.

For case continuation BCOs, we use the last tick seen before it as the
source location. The reasoning is described in Note [Debugger: Stepout internal break locs].

Note how T26042c, which was broken because it displayed the incorrect
behavior of the previous step out when we'd end up at a deeper level
than the one from which we initiated step-out, is now fixed.

As of this commit, BRK_ALTS is now dead code and is thus dropped.

Note [Debugger: Stepout internal break locs]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Step-out tells the interpreter to run until the current function
returns to where it was called from, and stop there.

This is achieved by enabling the BRK_FUN found on the first RET_BCO
frame on the stack (See [Note Debugger: Step-out]).

Case continuation BCOs (which select an alternative branch) must
therefore be headed by a BRK_FUN. An example:

    f x = case g x of <--- end up here
        1 -> ...
        2 -> ...

    g y = ... <--- step out from here

- `g` will return a value to the case continuation BCO in `f`
- The case continuation BCO will receive the value returned from g
- Match on it and push the alternative continuation for that branch
- And then enter that alternative.

If we step-out of `g`, the first RET_BCO on the stack is the case
continuation of `f` -- execution should stop at its start, before
selecting an alternative. (One might ask, "why not enable the breakpoint
in the alternative instead?", because the alternative continuation is
only pushed to the stack *after* it is selected by the case cont. BCO)

However, the case cont. BCO is not associated with any source-level
tick, it is merely the glue code which selects alternatives which do
have source level ticks. Therefore, we have to come up at code
generation time with a breakpoint location ('InternalBreakLoc') to
display to the user when it is stopped there.

Our solution is to use the last tick seen just before reaching the case
continuation. This is robust because a case continuation will thus
always have a relevant breakpoint location:

    - The source location will be the last source-relevant expression
      executed before the continuation is pushed

    - So the source location will point to the thing you've just stepped
      out of

    - Doing :step-local from there will put you on the selected
      alternative (which at the source level may also be the e.g. next
      line in a do-block)

Examples, using angle brackets (<<...>>) to denote the breakpoint span:

    f x = case <<g x>> {- step in here -} of
        1 -> ...
        2 -> ...>

    g y = <<...>> <--- step out from here

    ...

    f x = <<case g x of <--- end up here, whole case highlighted
        1 -> ...
        2 -> ...>>

    doing :step-local ...

    f x = case g x of
        1 -> <<...>> <--- stop in the alternative
        2 -> ...

A second example based on T26042d2, where the source is a do-block IO
action, optimised to a chain of `case expressions`.

    main = do
      putStrLn "hello1"
      <<f>> <--- step-in here
      putStrLn "hello3"
      putStrLn "hello4"

    f = do
      <<putStrLn "hello2.1">> <--- step-out from here
      putStrLn "hello2.2"

    ...

    main = do
      putStrLn "hello1"
      <<f>> <--- end up here again, the previously executed expression
      putStrLn "hello3"
      putStrLn "hello4"

    doing step/step-local ...

    main = do
      putStrLn "hello1"
      f
      <<putStrLn "hello3">> <--- straight to the next line
      putStrLn "hello4"

Finishes #26042

- - - - -
c66910c0 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
debugger: Re-use the last BreakpointId whole in step-out

Previously, to come up with a location to stop at for `:stepout`, we
would store the location of the last BreakpointId surrounding the
continuation, as described by Note [Debugger: Stepout internal break locs].

However, re-using just the location from the last source breakpoint
isn't sufficient to provide the necessary information in the break
location. Specifically, it wouldn't bind any variables at that location.

Really, there is no reason not to re-use the last breakpoint wholesale,
and re-use all the information we had there. Step-out should behave just
as if we had stopped at the call, but s.t. continuing will not
re-execute the call.

This commit updates the CgBreakInfo to always store a BreakpointId, be
it the original one or the one we're emulating (for step-out).

It makes variable bindings on :stepout work

- - - - -
e4abed7b by sheaf at 2025-09-02T12:20:40-04:00
Revert accidental changes to hie.yaml
- - - - -
003b715b by meooow25 at 2025-09-02T23:48:51+02:00
Adjust the strictness of Data.List.iterate'

* Don't force the next element in advance when generating a (:).
* Force the first element to WHNF like every other element.

Now every element in the output list is forced to WHNF when the (:)
containing it is forced.

CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/335

- - - - -
b2f6aad0 by Simon Hengel at 2025-09-03T04:36:10-04:00
Refactoring: More consistently use logOutput, logInfo, fatalErrorMsg

- - - - -
60a16db7 by Rodrigo Mesquita at 2025-09-03T10:55:50+01:00
bytecode: Don't PUSH_L 0; SLIDE 1 1

While looking through bytecode I noticed a quite common unfortunate
pattern:

...
PUSH_L 0
SLIDE 1 1

We do this often by generically constructing a tail call from a function
atom that may be somewhere arbitrary on the stack.
However, for the special case that the function can be found directly on
top of the stack, as part of the arguments, it's plain redundant to push
then slide it.

In this commit we add a small optimisation to the generation of
tailcalls in bytecode. Simply: lookahead for the function in the stack.
If it is the first thing on the stack and it is part of the arguments
which would be dropped as we entered the tail call, then don't push then
slide it.

In a simple example (T26042b), this already produced a drastic
improvement in generated code (left is old, right is with this patch):

```diff
3c3
< 2025-07-29 10:14:02.081277 UTC
---
...
2025-07-29 10:50:36.560949 UTC
160,161c160
<                                            PUSH_L   0
<                                            SLIDE    1 2

...
SLIDE    1 1
164,165d162
<                                       PUSH_L   0
<                                       SLIDE    1 1
175,176c172
<                             PUSH_L   0
<                             SLIDE    1 2
---
...
SLIDE    1 1
179,180d174
<                        PUSH_L   0
<                        SLIDE    1 1
206,207d199
<                        PUSH_L   0
<                        SLIDE    1 1
210,211d201
<                   PUSH_L   0
<                   SLIDE    1 1
214,215d203
<              PUSH_L   0
<              SLIDE    1 1
218,219d205
<         PUSH_L   0
<         SLIDE    1 1
222,223d207
<    PUSH_L   0
<    SLIDE    1 1
...
600,601c566
<                                                 PUSH_L   0
<                                                 SLIDE    1 2
---
...
SLIDE    1 1
604,605d568
<                                            PUSH_L   0
<                                            SLIDE    1 1
632,633d594
<                                            PUSH_L   0
<                                            SLIDE    1 1
636,637d596
<                                       PUSH_L   0
<                                       SLIDE    1 1
640,641d598
<                                  PUSH_L   0
<                                  SLIDE    1 1
644,645d600
<                             PUSH_L   0
<                             SLIDE    1 1
648,649d602
<                        PUSH_L   0
<                        SLIDE    1 1
652,653d604
<                   PUSH_L   0
<                   SLIDE    1 1
656,657d606
<              PUSH_L   0
<              SLIDE    1 1
660,661d608
<         PUSH_L   0
<         SLIDE    1 1
664,665d610
<    PUSH_L   0
<    SLIDE    1 1
```

I also compiled lib:Cabal to bytecode and counted the number of bytecode
lines with `find dist-newstyle -name "*.dump-BCOs" -exec wc {} +`:

    with unoptimized core:
    1190689 lines (before) - 1172891 lines (now)
    = 17798 less redundant instructions (-1.5% lines)

    with optimized core:
    1924818 lines (before) - 1864836 lines (now)
    = 59982 less redundant instructions (-3.1% lines)

- - - - -
8b2c72c0 by L0neGamer at 2025-09-04T06:32:03-04:00
Add Control.Monad.thenM and Control.Applicative.thenA

- - - - -
39e1b7cb by Teo Camarasu at 2025-09-04T06:32:46-04:00
ghc-internal: invert dependency of GHC.Internal.TH.Syntax on Data.Data

This means that Data.Data no longer blocks building TH.Syntax, which
allows greater parallelism in our builds.

We move the Data.Data.Data instances to Data.Data. Quasi depends on
Data.Data for one of its methods, so,
we split the Quasi/Q, etc definition out of GHC.Internal.TH.Syntax
into its own module. This has the added benefit of splitting up this
quite large module.

Previously TH.Syntax was a bottleneck when compiling ghc-internal. Now
it is less of a bottle-neck and is also slightly quicker to
compile (since it no longer contains these instances) at the cost of
making Data.Data slightly more expensive to compile.
TH.Lift which depends on TH.Syntax can also compile quicker and no
longer blocks ghc-internal finishing to compile.

Resolves #26217

-------------------------
Metric Decrease:
    MultiLayerModulesTH_OneShot
    T13253
    T21839c
    T24471
Metric Increase:
    T12227
-------------------------

- - - - -
bdf82fd2 by Teo Camarasu at 2025-09-04T06:32:46-04:00
compiler: delete unused names in Builtins.Names.TH

returnQ and bindQ are no longer used in the compiler.
There was also a very old comment that referred to them that I have modernized

- - - - -
41a448e5 by Ben Gamari at 2025-09-04T19:21:43-04:00
hadrian: Pass lib & include directories to ghc `Setup configure`

- - - - -
46bb9a79 by Ben Gamari at 2025-09-04T19:21:44-04:00
rts/IPE: Fix compilation when zstd is enabled

This was broken by the refactoring undertaken in
c80dd91c0bf6ac034f0c592f16c548b9408a8481.

Closes #26312.

- - - - -
138a6e34 by sheaf at 2025-09-04T19:22:46-04:00
Make mkCast assertion a bit clearer

This commit changes the assertion message that gets printed when one
calls mkCast with a coercion whose kind does not match the type of the
inner expression. I always found the assertion message a bit confusing,
as it didn't clearly state what exactly was the error.

- - - - -
9d626be1 by sheaf at 2025-09-04T19:22:46-04:00
Simplifier/rules: fix mistakes in Notes & comments

- - - - -
94b62aa7 by Simon Peyton Jones at 2025-09-08T03:37:14-04:00
Refactor ForAllCo

This is a pure refactor, addressing #26389.

It arranges that the kind coercion in a ForAllCo is a MCoercion, rather
than a plain Coercion, thus removing redundancy in the common case.
See (FC8) in Note [ForAllCo]

It's a nice cleanup.

- - - - -
624afa4a by sheaf at 2025-09-08T03:38:05-04:00
Use tcMkScaledFunTys in matchExpectedFunTys

We should use tcMkScaledFunTys rather than mkScaledFunTys in
GHC.Tc.Utils.Unify.matchExpectedFunTys, as the latter crashes
when the kind of the result type is a bare metavariable.
We know the result is always Type-like, so we don't need scaledFunTys
to try to rediscover that from the kind.

Fixes #26277

- - - - -
0975d2b6 by sheaf at 2025-09-08T03:38:54-04:00
Revert "Remove hptAllFamInstances usage during upsweep"

This reverts commit 3bf6720eff5e86e673568e756161e6d6150eb440.

- - - - -
0cf34176 by soulomoon at 2025-09-08T03:38:54-04:00
Family consistency checks: add test for #26154

This commit adds the test T26154, to make sure that GHC doesn't crash
when performing type family consistency checks. This test case
was extracted from Agda.

Fixes #26154

- - - - -
ba210d98 by Simon Peyton Jones at 2025-09-08T16:26:36+01:00
Report solid equality errors before custom errors

This MR fixes #26255 by

* Reporting solid equality errors like
     Int ~ Bool
  before "custom type errors".  See comments in `report1` in
  `reportWanteds`

* Suppressing errors that arise from superclasses of
  Wanteds.  See (SCE1) in Note [Suppressing confusing errors]

More details in #26255.

- - - - -
b6249140 by Simon Peyton Jones at 2025-09-10T10:42:38-04:00
Fix a scoping error in Specialise

This small patch fixes #26329, which triggered a scoping error.

Test is in T21391, with -fpolymorphic-specialisation enabled

- - - - -
45305ab8 by sheaf at 2025-09-10T10:43:29-04:00
Make rationalTo{Float,Double} inline in phase 0

We hold off on inlining these until phase 0 to allow constant-folding
rules to fire. However, once we get to phase 0, we should inline them,
e.g. to expose unboxing opportunities.

See CLC proposal #356.

- - - - -
0959d4bc by Andreas Klebinger at 2025-09-10T10:44:12-04:00
Add regression test for #26056

- - - - -
dc79593d by sheaf at 2025-09-10T10:45:01-04:00
Deep subsumption: unify mults without tcEqMult

As seen in #26332, we may well end up with a non-reflexive multiplicity
coercion when doing deep subsumption. We should do the same thing that
we do without deep subsumption: unify the multiplicities normally,
without requiring that the coercion is reflexive (which is what
'tcEqMult' was doing).

Fixes #26332

- - - - -
4bfe2269 by sheaf at 2025-09-10T10:45:50-04:00
lint-codes: fixup MSYS drive letter on Windows

This change ensures that System.Directory.listDirectory doesn't trip up
on an MSYS-style path like '/c/Foo' when trying to list all testsuite
stdout/stderr files as required for testing coverage of GHC diagnostic
codes in the testsuite.

Fixes #25178

- - - - -
56540775 by Ben Gamari at 2025-09-10T10:46:32-04:00
gitlab-ci: Disable split sections on FreeBSD

Due to #26303.

- - - - -
1537784b by Moritz Angermann at 2025-09-10T10:47:13-04:00
Improve mach-o relocation information

This change adds more information about the symbol and addresses
we try to relocate in the linker.  This significantly helps when
deubbging relocation issues reported by users.

- - - - -
4e67855b by Moritz Angermann at 2025-09-10T10:47:54-04:00
test.mk expect GhcLeadingUnderscore, not LeadingUnderscore (in line with the other Ghc prefixed variables.

- - - - -
c1cdd265 by Moritz Angermann at 2025-09-10T10:48:35-04:00
testsuite: Fix broken exec_signals_child.c

There is no signal 0. The signal mask is 1-32.

- - - - -
99ac335c by Moritz Angermann at 2025-09-10T10:49:15-04:00
testsuite: clarify Windows/Darwin locale rationale for skipping T6037 T2507 T8959a

- - - - -
0e8fa77a by Moritz Angermann at 2025-09-10T10:49:56-04:00
Skip broken tests on macOS (due to leading underscore not handled properly in the expected output.)

- - - - -
28570c59 by Zubin Duggal at 2025-09-10T10:50:37-04:00
docs(sphinx): fix links to reverse flags when using the :ghc-flag:`-fno-<flag>` syntax

This solution is rather hacky and I suspect there is a better way to do this but I don't know
enough about Sphinx to do better.

Fixes #26352

- - - - -
d17257ed by Cheng Shao at 2025-09-10T17:01:27+02:00
rel-eng: update alpine images to 3.22

This patch is a part of #25876 and updates alpine images to 3.22,
while still retaining 3.12 for x86_64 fully_static bindists.

-------------------------
Metric Decrease:
    MultiComponentModulesRecomp
-------------------------

- - - - -
db3276bb by Sylvain Henry at 2025-09-11T11:27:28-04:00
T16180: indicate that the stack isn't executable

- - - - -
11eeeba7 by Sylvain Henry at 2025-09-11T11:27:28-04:00
Fix some tests (statically linked GHC vs libc)

When GHC is linked statically, the stdout C global variable that GHC uses
isn't shared with the stdout C global variable used by loaded code.

As a consequence, the latter must be explicitly flushed because GHC
won't flush it before exiting.

- - - - -
80a07571 by Sylvain Henry at 2025-09-11T11:28:18-04:00
Testsuite: fix debug_rts detection

Running the testsuite without Hadrian should set config.debug_rts
correctly too.

- - - - -
62ae97de by Duncan Coutts at 2025-09-12T13:23:33-04:00
Handle heap allocation failure in I/O primops

The current I/O managers do not use allocateMightFail, but future ones
will. To support this properly we need to be able to return to the
primop with a failure. We simply use a bool return value.

Currently however, we will just throw an exception rather than calling
the GC because that's what all the other primops do too.

For the general issue of primops invoking GC and retrying, see
https://gitlab.haskell.org/ghc/ghc/-/issues/24105

- - - - -
cb9093f5 by Duncan Coutts at 2025-09-12T13:23:33-04:00
Move (and rename) scheduleStartSignalHandlers into RtsSignals.h

Previously it was a local helper (static) function in Schedule.c.

Rename it to startPendingSignalHandlers and deifine it as an inline
header function in RtsSignals.h. So it should still be fast.

Each (new style) I/O manager is going to need to do the same, so eliminating
the duplication now makes sense.

- - - - -
9736d44a by Duncan Coutts at 2025-09-12T13:23:33-04:00
Reduce detail in printThreadBlockage I/O blocking cases

The printThreadBlockage is used in debug tracing output.
For the cases BlockedOn{Read,Write,Delay} the output previously included
the fd that was being waited on, and the delay target wake time.

Superficially this sounds useful, but it's clearly not that useful
because it was already wrong for the Win32 non-threaded I/O manager. In
that situation it will print garbage (the async_result pointer, cast to
a fd or a time).

So given that it apparently never mattered that the information was
accurate, then it's hardly a big jump to say it doesn't matter if it is
present at all.

A good reason to remove it is that otherwise we have to make a new
API and a per-I/O manager implementation to fetch the information. And
for some I/O manager implementations, this information is not available.
It is not available in the win32 non-threaded I/O manager. And for some
future Linux ones, there is no need for the fd to be stored, so storing
it would be just extra space used for very little gain.

So the simplest thing is to just remove the detail.

- - - - -
bc0f2d5d by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add TimeoutQueue.{c,h} and corresponding tests

A data structure used to efficiently manage a collection of timeouts.

It is a priority queue based on absolute expiry time. It uses 64bit
high-precision Time for the keys. The values are normal closures which
allows for example using MVars for unblocking.

It is common in many applications for timeouts to be created and then
deleted or altered before they expire. Thus the choice of data structure
for timeouts should support this efficiently. The implementation choice
here is a leftist heap with the extra feature that it supports deleting
arbitrary elements, provided the caller retain a pointer to the element.
While the deleteMin operation takes O(log n) time, as in all heap
structures, the delete operation for arbitrary elements /typically/
takes O(1), and only O(log n) in the worst case. In practice, when
managing thousands of timeouts it can be a factor of 10 faster to delete
a random timeout queue element than to remove the minimum element. This
supports the common use case.

The plan is to use it in some of the RTS-side I/O managers to support
their timer functionality. In this use case the heap value will be an
MVar used for each timeout to unblock waiting threads.

- - - - -
d1679c9d by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add ClosureTable.{c,h} and corresponding tests

A table of pointers to closures on the GC heap with stable indexes.

It provides O(1) alloc, free and lookup. The table can be expanded
using a simple doubling strategy: in which case allocation is typically
O(1) and occasionally O(n) for overall amortised O(1). No shrinking is
used.

The table itself is heap allocated, and points to other heap objects.
As such it's necessary to use markClosureTable to ensure the table is
used as a GC root to keep the table entries alive, and maintain proper
pointers to them as the GC moves heap objects about.

It is designed to be allocated and accesses exclusively from a single
capability, enabling it to work without any locking. It is thus similar
to the StablePtr table, but per-capability which removes the need for
locking. It _should_ also provide lower GC pause times with the
non-moving GC by spending only O(1) time in markClosureTable, vs O(n)
for markStablePtrTable.

The plan is to use it in some of the I/O managers to keep track of
in-flight I/O operations (but not timers). This allows the tracking
info to be kept on the (unpinned) GC heap, and shared with Haskell
code, and by putting a pointer to the tracking information in a table,
the index remains stable and can be passed via foreign code (like the
kernel).

- - - - -
78cb8dd5 by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add the StgAsyncIOOp closure type

This is intended to be used by multiple I/O managers to help with
tracking in-flight I/O operations.

It is called asynchronous because from the point of view of the RTS we
have many such operations in progress at once. From the point of view of
a Haskell thread of course it can look synchronous.

- - - - -
a2839896 by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add StgAsyncIOOp and StgTimeoutQueue to tso->block_info

These will be used by new I/O managers, for threads blocked on I/O or
timeouts.

- - - - -
fdc2451c by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add a new I/O manager based on poll()

This is a proof of concept I/O manager, to show how to add new ones
neatly, using the ClosureTable and TimeoutQueue infrastructure.

It uses the old unix poll() API, so it is of course limited in
performance by that, but it should have the benefit of wide
compatibility. Also we neatly avoid a name clash with the existing
select() I/O manager.

Compared to the select() I/O manager:
1. beause it uses poll() it is not limited to 1024 file descriptors
   (but it's still O(n) so don't expect great performance);
2. it should have much faster threadDelay (when using it in lots of
   threads at once) because it's based on the new TimeoutQueue which is
   O(log n) rather than O(n).

Some of the code related to timers/timouts is put into a shared module
rts/posix/Timeout.{h,c} since it is intended to be shared with other
similar I/O managers.

- - - - -
6c273b76 by Duncan Coutts at 2025-09-12T13:23:34-04:00
Document the I/O managers in the user guide

and note the new poll I/O manager in the release notes.

- - - - -
824fab74 by Duncan Coutts at 2025-09-12T13:23:34-04:00
Use the poll() I/O manager by default

That is, for the non-threaded RTS, prefer the poll I/O manager over the
legacy select() one, if both can be enabled.

This patch is primarily for CI testing, so we should probably remove
this patch before merging. We can change defaults later after wider
testing and feedback.

- - - - -
39392532 by Luite Stegeman at 2025-09-12T13:24:16-04:00
Support larger unboxed sums

Change known constructor encoding for sums in interfaces to use
11 bits for both the arity and the alternative (up from 8 and 6,
respectively)

- - - - -
2af12e21 by Luite Stegeman at 2025-09-12T13:24:16-04:00
Decompose padding smallest-first in Cmm toplevel data constructors

This makes each individual padding value aligned

- - - - -
418fa78f by Luite Stegeman at 2025-09-12T13:24:16-04:00
Use slots smaller than word as tag for smaller unboxed sums

This packs unboxed sums more efficiently by allowing
Word8, Word16 and Word32 for the tag field if the number of
constructors is small enough

- - - - -
8d7e912f by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00
ghc-toolchain: Use ByteOrder rather than new Endianness

Don't introduce a duplicate datatype when the previous one is equivalent
and already used elsewhere. This avoids unnecessary translation between
the two.

- - - - -
7d378476 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00
Read Toolchain.Target files rather than 'settings'

This commit makes GHC read `lib/targets/default.target`, a file with a
serialized value of `ghc-toolchain`'s `GHC.Toolchain.Target`.

Moreover, it removes all the now-redundant entries from `lib/settings`
that are configured as part of a `Target` but were being written into
`settings`.

This makes it easier to support multiple targets from the same compiler
(aka runtime retargetability). `ghc-toolchain` can be re-run many times
standalone to produce a `Target` description for different targets, and,
in the future, GHC will be able to pick at runtime amongst different
`Target` files.

This commit only makes it read the default `Target` configured in-tree
or configured when installing the bindist.

The remaining bits of `settings` need to be moved to `Target` in follow
up commits, but ultimately they all should be moved since they are
per-target relevant.

Fixes #24212

On Windows, the constant overhead of parsing a slightly more complex
data structure causes some small-allocation tests to wiggle around 1 to
2 extra MB (1-2% in these cases).

-------------------------
Metric Increase:
    MultiLayerModulesTH_OneShot
    T10421
    T10547
    T12234
    T12425
    T13035
    T18140
    T18923
    T9198
    TcPlugin_RewritePerf
-------------------------

- - - - -
e0780a16 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00
ghc-toolchain: Move TgtHasLibm to per-Target file

TargetHasLibm is now part of the per-target configuration

Towards #26227

- - - - -
8235dd8c by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00
ghc-toolchain: Move UseLibdw to per-Target file

To support DWARF unwinding, the RTS must be built with the -f+libdw flag
and with the -DUSE_LIBDW macro definition. These flags are passed on
build by Hadrian when --enable-dwarf-unwinding is specified at configure
time.

Whether the RTS was built with support for DWARF is a per-target
property, and as such, it was moved to the per-target
GHC.Toolchain.Target.Target file.

Additionally, we keep in the target file the include and library paths
for finding libdw, since libdw should be checked at configure time (be
it by configure, or ghc-toolchain, that libdw is properly available).

Preserving the user-given include paths for libdw facilitates in the
future building the RTS on demand for a given target (if we didn't keep
that user input, we couldn't)

Towards #26227

- - - - -
d5ecf2e8 by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00
ghc-toolchain: Make "Support SMP" a query on a Toolchain.Target

"Support SMP" is merely a function of target, so we can represent it as
such in `ghc-toolchain`.

Hadrian queries the Target using this predicate to determine how to
build GHC, and GHC queries the Target similarly to report under --info
whether it "Support SMP"

Towards #26227

- - - - -
e07b031a by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00
ghc-toolchain: Make "tgt rts linker only supports shared libs" function on Target

Just like with "Support SMP", "target RTS linker only supports shared
libraries" is a predicate on a `Target` so we can just compute it when
necessary from the given `Target`.

Towards #26227

- - - - -
14123ee6 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00
Solve forall-constraints via an implication, again

In this earlier commit:

  commit 953fd8f1dc080f1c56e3a60b4b7157456949be29
  Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
  Date:   Mon Jul 21 10:06:43 2025 +0100

  Solve forall-constraints immediately, or not at all

I used a all-or-nothing strategy for quantified constraints
(aka forall-constraints).  But alas that fell foul of #26315,
and #26376.

So this MR goes back to solving a quantified constraint by
turning it into an implication; UNLESS we are simplifying
constraints from a SPECIALISE pragma, in which case the
all-or-nothing strategy is great.  See:

   Note [Solving a Wanted forall-constraint]

Other stuff in this MR:

* TcSMode becomes a record of flags, rather than an enumeration
  type; much nicer.

* Some fancy footwork to avoid error messages worsening again
  (The above MR made them better; we want to retain that.)
  See `GHC.Tc.Errors.Ppr.pprQCOriginExtra`.

-------------------------
Metric Decrease:
    T24471
-------------------------

- - - - -
e6c192e2 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00
Add a test case for #26396

...same bug ast #26315

- - - - -
8f3d80ff by Luite Stegeman at 2025-09-13T08:43:09+02:00
Use mkVirtHeapOffsets for reconstructing terms in RTTI

This makes mkVirtHeapOffsets the single source of truth for
finding field offsets in closures.

- - - - -
eb389338 by Luite Stegeman at 2025-09-13T08:43:09+02:00
Sort non-pointer fields by size for more efficient packing

This sorts non-pointer fields in mkVirtHeapOffsets, always
storing the largest field first. The relative order of
equally sized fields remains unchanged.

This reduces wasted padding/alignment space in closures with
differently sized fields.

- - - - -
99b233f4 by Alison at 2025-09-13T16:51:04-04:00
ghc-heap: Fix race condition with profiling builds

Apply the same fix from Closures.hs (64fd0fac83) to Heap.hs by adding
empty imports to make way-dependent dependencies visible to `ghc -M`.

Fixes #15197, #26407

- - - - -
77deaa7a by Cheng Shao at 2025-09-14T21:29:45-04:00
hadrian: build in-tree gmp with -fvisibility=hidden

When hadrian builds in-tree gmp, it should build the shared objects
with -fvisibility=hidden. The gmp symbols are only used by bignum
logic in ghc-internal and shouldn't be exported by the ghc-internal
shared library. We should always strive to keep shared library symbol
table lean, which benefits platforms with slow dynamic linker or even
hard limits about how many symbols can be exported (e.g. macos dyld,
win32 dll and wasm dyld).

- - - - -
42a18960 by Cheng Shao at 2025-09-14T21:30:26-04:00
Revert "wasm: add brotli compression for ghci browser mode"

This reverts commit 731217ce68a1093b5f9e26a07d5bd2cdade2b352.
Benchmarks show non-negligible overhead when browser runs on the same
host, which is the majority of actual use cases.

- - - - -
e6755b9f by Cheng Shao at 2025-09-14T21:30:26-04:00
wasm: remove etag logic in ghci browser mode web server

This commit removes the etag logic in dyld script's ghci browser mode
web server. It was meant to support caching logic of wasm shared
libraries, but even if the port is manually specified to make caching
even relevant, for localhost the extra overhead around etag logic is
simply not worth it according to benchmarks.

- - - - -
ac5859b9 by sheaf at 2025-09-16T14:58:38-04:00
Add 'Outputable Natural' instance

This commit adds an Outputable instance for the Natural natural-number type,
as well as a "natural :: Natural -> SDoc" function that mirrors the existing
"integer" function.

- - - - -
d48ebc23 by Cheng Shao at 2025-09-16T14:59:18-04:00
autoconf: emit warning instead of error for FIND_PYTHON logic

This patch makes FIND_PYTHON logic emit warning instead of error, so
when the user doesn't expect to run the testsuite driver (especially
when installing a bindist), python would not be mandatory. Fixes #26347.

- - - - -
54b5950e by Sylvain Henry at 2025-09-17T04:45:18-04:00
Print fully qualified unit names in name mismatch

It's more user-friendly to directly print the right thing instead of
requiring the user to retry with the additional `-dppr-debug` flag.

- - - - -
403cb665 by Ben Gamari at 2025-09-17T04:46:00-04:00
configure: Fix consistency between distrib and source CC check

Previously distrib/configure.ac did not
include `cc`.

Closes #26394.

- - - - -
2dcd4cb9 by Oleg Grenrus at 2025-09-17T04:46:41-04:00
Use isPrint in showUnique

The comment say

```
-- Avoid emitting non-printable characters in pretty uniques. See #25989.
```

so let the code do exactly that.

There are tags (at least : and 0 .. 9) which weren't in A .. z range.

- - - - -
e5dd754b by Oleg Grenrus at 2025-09-17T04:46:42-04:00
Shorten in-module links in hyperlinked source

Instead of href="This.Module#ident" to just "#ident"

- - - - -
63189b2c by Oleg Grenrus at 2025-09-17T04:46:42-04:00
Use showUnique in internalAnchorIdent

Showing the key of Unique as a number is generally not a great idea.
GHC Unique has a tag in high bits, so the raw number is unnecessarily
big.

So now we have

```html
<a href="#l-rvgK"><span class="hs-identifier hs-var hs-var">bar</span></a>
```

instead of

```html
<a href="#local-6989586621679015689"><span class="hs-identifier hs-var hs-var">bar</span></a>
```

Together with previous changes of shorter intra-module links the effect
on compressed files is not huge, that is expected as we simply remove
repetitive contents which pack well.

```
12_694_206  Agda-2.9.0-docs-orig.tar.gz
12_566_065  Agda-2.9.0-docs.tar.gz
```

However when unpacked, the difference can be significant,
e.g. Agda's largest module source got 5% reduction:

```
14_230_117  Agda.Syntax.Parser.Parser.html
13_422_109  Agda.Syntax.Parser.Parser.html
```

The whole hyperlinked source code directory got similar reduction

```
121M	Agda-2.9.0-docs-orig/src
114M	Agda-2.9.0-docs/src
```

For the reference, sources are about 2/3 of the generated haddocks

```
178M	Agda-2.9.0-docs-old
172M	Agda-2.9.0-docs
```

so we get around 3.5% size reduction overall. Not bad for a small local
changes.

- - - - -
6f63f57b by Stefan Schulze Frielinghaus at 2025-09-17T04:47:22-04:00
rts: Fix alignment for gen_workspace #26334

After a0fa4941903272c48b050d24e93eec819eff51bd bootstrap is broken on
s390x and errors out with

rts/sm/GCThread.h:207:5: error:
     error: alignment of array elements is greater than element size
      207 |     gen_workspace gens[];
          |     ^~~~~~~~~~~~~

The alignment constraint is applied via the attribute to the type
gen_workspace and leaves the underlying type struct gen_workspace_
untouched.  On Aarch64, x86, and s390x the struct has a size of 128
bytes.  On Aarch64 and x86 the alignments of 128 and 64 are divisors of
the size, respectively, which is why the type is a viable member type
for an array.  However, on s390x, the alignment is 256 and therefore is
not a divisor of the size and hence cannot be used for arrays.

Basically I see two fixes here.  Either decrease the alignment
requirement on s390x, or by applying the alignment constraint on the
struct itself.  The former might affect performance as noted in
a0fa4941903272c48b050d24e93eec819eff51bd.  The latter introduces padding
bits whenever necessary in order to ensure that
sizeof(gen_workspace[N])==N*sizeof(gen_workspace) holds which is done by
this patch.

- - - - -
06d25623 by Cheng Shao at 2025-09-17T19:32:27-04:00
ghci: add :shell command

This patch adds a new :shell command to ghci which works similarly to
:!, except it guarantees to run the command via sh -c. On POSIX hosts
the behavior is identical to :!, but on Windows it uses the msys2
shell instead of system cmd.exe shell. This is convenient when writing
simple ghci scripts that run simple POSIX commands, and the behavior
can be expected to be coherent on both Windows and POSIX.

Co-authored-by: Codex <codex@openai.com>

- - - - -
186054f7 by Cheng Shao at 2025-09-17T19:32:27-04:00
testsuite: remove legacy :shell trick

This commit makes use of the built-in :shell functionality in ghci in
the test cases, and remove the legacy :shell trick.

- - - - -
0a3a4aa3 by Cheng Shao at 2025-09-17T19:32:27-04:00
docs: document :shell in ghci

This commit documents the :shell command in ghci.

Co-authored-by: Codex <codex@openai.com>

- - - - -
a4ff12bb by Cheng Shao at 2025-09-17T19:33:09-04:00
ghc-internal: fix codepages program

codepages was not properly updated during the base -> ghc-internal
migration, this commit fixes it.

- - - - -
7e094def by Cheng Shao at 2025-09-17T19:33:09-04:00
ghc-internal: relax ucd2haskell cabal upper bounds

This commit relaxes ucd2haskell cabal upper bounds to make it runnable
via ghc 9.12/9.14.

- - - - -
7077c9f7 by Cheng Shao at 2025-09-17T19:33:09-04:00
ghc-internal: update to unicode 17.0.0

This commit updates the generated code in ghc-internal to match
unicode 17.0.0.

- - - - -
cef8938f by sheaf at 2025-09-17T19:34:09-04:00
Bad record update msg: allow out-of-scope datacons

This commit ensures that, when we encounter an invalid record update
(because no constructor exists which contains all of the record fields
mentioned in the record update), we graciously handle the situation in
which the constructors themselves are not in scope. In that case,
instead of looking up the constructors in the GlobalRdrEnv, directly
look up their GREInfo using the lookupGREInfo function.

Fixes #26391

- - - - -
a2d9d7c2 by sheaf at 2025-09-17T19:34:09-04:00
Improve Notes about disambiguating record updates

This commit updates the notes [Disambiguating record updates] and
[Type-directed record disambiguation], in particular adding more
information about the deprecation status of type-directed disambiguation
of record updates.

- - - - -
de44e69e by sheaf at 2025-09-19T05:16:51-04:00
Enable TcM plugins in initTc

This commit ensures that we run typechecker plugins and defaulting
plugins whenever we call initTc.

In particular, this ensures that the pattern-match checker, which calls
'initTcDsForSolver' which calls 'initTc', runs with typechecker plugins
enabled. This matters for situations like:

  merge :: Vec n a -> Vec n a -> Vec (2 * n) a
  merge Nil Nil = Nil
  merge (a <: as) (b <: bs) = a :< (b <: merge as bs)

in which we need the typechecker plugin to run in order to tell us that
the Givens would be inconsistent in the additional equation

  merge (_ <: _) Nil

and thus that the equation is not needed.

Fixes #26395

- - - - -
2c378ad2 by Cheng Shao at 2025-09-19T05:17:33-04:00
rel-eng: update fedora image to 42

This patch is a part of #25876 and updates fedora image to 42.

- - - - -
0a9d9ffc by Sylvain Henry at 2025-09-19T13:12:14-04:00
Fix output of T14999 (#23685)

Fix output of T14999 to:
- take into account the +1 offset to DW_AT_low_pc (see Note [Info Offset])
- always use Intel's syntax to force consistency: it was reported that
  sometimes GDB prints `jmpq` instead of `jmp` with the AT&T syntax

- - - - -
1480872a by Vladislav Zavialov at 2025-09-19T13:12:54-04:00
Fix PREP_MAYBE_LIBRARY in prep_target_file.m4

This change fixes a configure error introduced in:

  commit 8235dd8c4945db9cb03e3be3c388d729d576ed1e
  ghc-toolchain: Move UseLibdw to per-Target file

Now the build no longer fails with:

  acghc-toolchain: Failed to read a valid Target value from hadrian/cfg/default.target

- - - - -
d1d9e39e by Ben Gamari at 2025-09-19T18:24:52-04:00
StgToByteCode: Don't assume that data con workers are nullary

Previously StgToByteCode assumed that all data-con workers were of a
nullary representation. This is not a valid assumption, as seen
in #23210, where an unsaturated application of a unary data
constructor's worker resulted in invalid bytecode. Sadly, I have not yet
been able to reduce a minimal testcase for this.

Fixes #23210.

- - - - -
3eeecd50 by Ben Gamari at 2025-09-19T18:24:53-04:00
testsuite: Mark T23146* as unbroken

- - - - -
2e73f342 by sheaf at 2025-09-19T18:24:53-04:00
Add test for #26216

- - - - -
c2efb912 by Sven Tennie at 2025-09-19T18:25:36-04:00
Generate correct test header

This increases convenience when copying & pasting...

- - - - -
d2fb811e by Sven Tennie at 2025-09-19T18:25:36-04:00
foundation test: Fix shift amount (#26248)

Shift primops' results are only defined for shift amounts of 0 to word
size - 1. The approach is similar to testing div-like operations (which
have a constraint regarding zero operands.)

This was partly vibe coded (https://github.com/supersven/ghc/pull/1) but
then heavily refactored.

- - - - -
a62ce115 by Andreas Klebinger at 2025-09-19T18:26:18-04:00
Tweak jspace test

I've given it a longer timeout, and tweaked the test file generation
to speed it up a bit. Hopefully that is enough to make it constentily pass.

Last but not least it now also always uses three threads.

- - - - -
0f034942 by Cheng Shao at 2025-09-19T18:26:59-04:00
rts: remove obsolete CC_SUPPORTS_TLS logic

This patch removes obsolete CC_SUPPORTS_TLS logic throughout the rts,
given __thread is now uniformly supported by C toolchains of all
platforms we currently support.

- - - - -
ef705655 by Cheng Shao at 2025-09-19T18:27:41-04:00
rts: remove obsolete HAS_VISIBILITY_HIDDEN logic

This patch removes obsolete HAS_VISIBILITY_HIDDEN logic throughout the
rts, given __attribute__((visibility("hidden"))) is uniformly
supported by C toolchains of all platforms we currently support.

- - - - -
9fdc1f7d by Cheng Shao at 2025-09-19T18:28:21-04:00
rts: remove -O3 pragma hack in Hash.c

This patch removes an obsolete gcc pragma to specify -O3 in Hash.c.
Hadrian already passes the right flag.

- - - - -
b8cfa8f7 by Cheng Shao at 2025-09-19T18:29:01-04:00
rts: remove obsolete COMPILING_WINDOWS_DLL logic

This patch removes obsolete COMPILING_WINDOWS_DLL logic throughout the
rts. They were once used for compiling to win32 DLLs, but we haven't
been able to compile Haskell units to win32 DLLs for many years now,
due to PE format's restriction of no more than 65536 exported symbols
in a single DLL.

- - - - -
bb760611 by Cheng Shao at 2025-09-19T18:29:42-04:00
wasm: bump browser_wasi_shim to 0.4.2

This patch bumps the browser_wasi_shim dependency of wasm dyld script
to 0.4.2.

- - - - -
8b0940db by Cheng Shao at 2025-09-20T06:48:05-04:00
compiler: move Binary instance of Map to GHC.Utils.Binary

This patch moves `Binary` instance of `Map` from `haddock-api` to
`GHC.Utils.Binary`. This also allows us to remove a redundant instance
defined for `NameEntityInfo`, which is a type synonym for `Map`.

- - - - -
4a8fed75 by Vladislav Zavialov at 2025-09-20T06:48:47-04:00
Fix keyword in ExplicitNamespaces error message (#26418)

Consider this module header and the resulting error:

  {-# LANGUAGE NoExplicitNamespaces #-}
  module T26418 (data HeadC) where

  -- error: [GHC-47007]
  --   Illegal keyword 'type'

Previously, the error message would mention 'type' (as shown above),
even though the user wrote 'data'. This has now been fixed.

The error location has also been corrected: it is now reported at the
keyword position rather than at the position of the associated
import/export item.

- - - - -
867c2675 by Cheng Shao at 2025-09-20T06:49:28-04:00
wasm: fix dyld handling for forward declared GOT.func items

This patch fixes wasm shared linker's handling of forward declared
GOT.func items, see linked issue for details. Also adds T26430 test to
witness the fix. Fixes #26430.

Co-authored-by: Codex <codex@openai.com>

- - - - -
e7df6cc0 by Simon Peyton Jones at 2025-09-23T14:34:39-04:00
Improve pretty printer for HsExpr

Given a very deeply-nested application, it just kept printing
deeper and deeper.  This small change makes it cut off.

Test is in #26330, but we also get a dramatic decrease in compile
time for perf/compiler/InstanceMatching:
   InstanceMatching  4,086,884,584  1,181,767,232 -71.1% GOOD
Why? Because before we got a GIGANTIC error message that took
ages to pretty-print; now we get this much more civilised message
(I have removed some whitespace.)

Match.hs:1007:1: error:
    • No instance for ‘Show (F001 a)’ arising from a use of ‘showsPrec’
    • In the second argument of ‘showString’, namely
        ‘(showsPrec
            11 b1
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b2
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b3
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b4
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b5
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b6
               (GHC.Internal.Show.showSpace (showsPrec ...)))))))))))))’

-----------------------
The main payload is

* At the start of `pprExpr`
* In the defn of `pprApp`

A little bit of refactoring:

* It turned out that we were setting the default cut-off depth to a
  fixed value in two places, so changing one didn't change the other.
  See defaultSDocDepth and defaultSDocCols

* I refactored `pprDeeperList` a bit so I could understand it better.

Because the depth calculation has changed, there are lots of small
error message wibbles.

Metric Decrease:
    InstanceMatching

- - - - -
209f0158 by Simon Peyton Jones at 2025-09-23T14:34:39-04:00
Use Outputable.ellipsis rather than text "..."

- - - - -
64bb0e37 by Sylvain Henry at 2025-09-23T14:35:56-04:00
deriveConstants: automatically pass -fcommon CC flag (#26393)

By mistake we tried to use deriveConstants without passing
`--gcc-flag -fcommon` (which Hadrian does) and it failed.

This patch:
1. adds parsing support for constants stored in the .bss section (i.e.
   when -fcommon isn't passed)
2. enables passing `-fcommon` automatically to the C compiler because
   Windows requires this for subtle reasons
3. Documents the subtle reasons

(1) isn't strictly necessary because we always do (2) but it does no
harm and it is still useful if the CC flags ever contain -fno-common

- - - - -
afcdf92f by Oleg Grenrus at 2025-09-23T14:36:41-04:00
Don't wrap spaces in <span>s

Doing similar comparison as in 63189b2ceca07edf4e179f4180ca60d470c62cb3

With this change the gzipped documentation is now 2% smaller (previously 1%)

12_694_206 Agda-2.9.0-docs-orig.tar.gz
12_436_829 Agda-2.9.0-docs.tar.gz

Unzipped docs are 5% smaller (previously 3%)

178M	Agda-2.9.0-docs-orig
169M	Agda-2.9.0-docs

Individual hyperlinked sources are around 7-10% smaller (previously 5%)
(`Parser` module is generated by happy and has relatively little whitespace)

14_230_117 Agda.Syntax.Parser.Parser.html
13_220_758 Agda.Syntax.Parser.Parser.html

Agda's hyperlinked sources are 9% smaller now:

121M	Agda-2.9.0-docs-orig/src
110M	Agda-2.9.0-docs/src

- - - - -
67de53a6 by Cheng Shao at 2025-09-23T14:37:31-04:00
rts: remove obsolete __GNUC__ related logic

This patch removes obsolete `__GNUC__` related logic, given on any
currently supported platform and toolchain, `__GNUC__ >= 4` is
universally true. Also pulls some other weeds and most notably, use
`__builtin___clear_cache` for clang as well, since clang has supported
this gcc intrinsic since 2014, see
https://github.com/llvm/llvm-project/commit/c491a8d4577052bc6b3b4c72a7db6a7c....

- - - - -
c4d32493 by Sven Tennie at 2025-09-23T20:40:57-04:00
RV64: Fix: Add missing truncation to MO_S_Shr (#26248)

Sub-double word (<W64) registers need to be truncated after the
operation.

- - - - -
41dce477 by Sven Tennie at 2025-09-23T20:40:57-04:00
RV64: Cleanup shift emitting cases/code

Remove overlapping cases to make the shift logic easier to understand.

- - - - -
0a601c30 by Alex Washburn at 2025-09-23T20:41:41-04:00
Correcting LLVM linking of Intel BMI intrinsics pdep{8,16} and pext{8,16}.

This patch fixes #26065.

The LLVM interface does not expose bindings to:

  - llvm.x86.bmi.pdep.8
  - llvm.x86.bmi.pdep.16
  - llvm.x86.bmi.pext.8
  - llvm.x86.bmi.pext.16

So calls are instead made to llvm.x86.bmi.{pdep,pext}.32 in these cases,
with pre/post-operation truncation to constrain the logical value range.

- - - - -
89e8ff3d by Peng Fan at 2025-09-23T20:42:37-04:00
NCG/LA64: Implement MO_BSwap and MO_BRev with bit-manipulation Instructions

- - - - -
50f6be09 by Sylvain Henry at 2025-09-23T20:43:29-04:00
Allow Core plugins to access unoptimized Core (#23337)

Make the first simple optimization pass after desugaring a real CoreToDo
pass. This allows CorePlugins to decide whether they want to be executed
before or after this pass.

- - - - -
30ef0aac by Simon Hengel at 2025-09-23T20:44:12-04:00
docs: Fix typo in scoped_type_variables.rst
- - - - -
f8919262 by Cheng Shao at 2025-09-23T20:44:54-04:00
ghci: fix bootstrapping with 9.12.3-rc1 and above

This patch fixes bootstrapping GHC with 9.12.3-rc1 and above. ghci
defines `Binary` instance for `HalfWord` in `ghc-heap`, which is a
proper `newtype` in 9.14 and starting from 9.12.3. Given we don't
build `ghc-heap` in stage0, we need to fix this predicate so that it
corresponds to the boot ghc versions that contain the right version of
`ghc-heap`.

- - - - -
a7f15858 by sheaf at 2025-09-24T09:49:53-04:00
User's guide: clarify optimisation of INLINABLE unfoldings

This updates the user's guide section on INLINABLE pragmas to explain how
the unfoldings of inlineable functions are optimised. The user's guide incorrectly
stated that the RHS was not optimised at all, but this is not true. Instead, GHC
is careful about phase control to optmise the RHS while retaining the guarantee
that GHC behaves as if the original RHS had been written.
- - - - -
495886d9 by Rodrigo Mesquita at 2025-09-24T09:50:35-04:00
cleanup: Delete historical artifact of COMPILING_WINDOWS_DLL

Namely, drop the obsolete
- DLL_IMPORT_RTS
- DLL_IMPORT_DATA_VAR
- DLL_IMPORT_DATA_VARNAME
- DLL_IMPORT_DATA_REF

These macros were not doing anything and placed inconsistently

Looking at the git logs reveal these macros were used to support
dynamic libraries on Win32, a feature that was dropped
in b8cfa8f741729ef123569fb321c4b2ab4a1a941c

This allows us to get rid of the rts/DLL.h file too.

- - - - -
5ae89054 by Sylvain Henry at 2025-09-24T17:07:00-04:00
Allow disabling builtin rules (#20298)

Add a way to disable built-in rules programmatically and with a debug flag.

I also took the opportunity to add a debug flag to disable bignum rules,
which was only possible programmatically (e.g. in a plugin).

- - - - -
135242ca by Rodrigo Mesquita at 2025-09-24T17:07:44-04:00
Don't use build CFLAGS and friends as target settings

In the GHC in tree configure, `CFLAGS`, `CXXFLAGS`, and similar tool
configuration flags apply to the BUILD phase of the compiler, i.e. to
the tools run to compile GHC itself.

Notably, they should /not/ be carried over to the Target settings, i.e.
these flags should /not/ apply to the tool which GHC invokes at runtime.

Fixes #25637

- - - - -
b418408b by Irene Knapp at 2025-09-25T09:47:54-04:00
Document etymology of "bind" as the name for `>>=`

It took me twenty years of contemplation to realize why it's called that.
I therefore feel that it may not be obvious to beginners.

- - - - -
e9c5e46f by Brandon Chinn at 2025-09-25T09:48:36-04:00
Fix tabs in string gaps (#26415)

Tabs in string gaps were broken in bb030d0d because previously, string gaps were manually parsed, but now it's lexed by the usual Alex grammar and post-processed after successful lexing.

It broke because of a discrepancy between GHC's lexer grammar and the Haskell Report. The Haskell Report includes tabs in whitechar:

whitechar  →  newline | vertab | space | tab | uniWhite

$whitechar used to include tabs until 18 years ago, when it was removed in order to exclude tabs from $white_no_nl in order to warn on tabs: 6e202120. In this MR, I'm adding \t back into $whitechar, and explicitly excluding \t from the $white_no_nl+ rule ignoring all whitespace in source code, which more accurately colocates the "ignore all whitespace except tabs, which is handled in the next line" logic.

As a side effect of this MR, tabs are now allowed in pragmas; currently, a pragma written as {-# \t LANGUAGE ... #-} is interpreted as the tab character being the pragma name, and GHC warns "Unrecognized pragma". With this change, tabs are ignored as whitespace, which more closely matches the Report anyway.

- - - - -
8bf5b309 by Cheng Shao at 2025-09-25T09:49:18-04:00
wasm: remove the --no-turbo-fast-api-calls hack from dynamic linker shebang

This patch removes the `--no-turbo-fast-api-calls` hack from the dyld
script shebang; it was used to workaround v8 fast call coredumps in
nodejs and no longer needed, and comes with a performance penalty,
hence the removal.

- - - - -
c1cab0c3 by Sylvain Henry at 2025-09-26T10:36:30-04:00
Revert "Add necessary flag for js linking"

This reverts commit 84f68e2231b2eddb2e1dc4e90af394ef0f2e803f.

This commit didn't have the expected effect. See discussion in #26290.
Instead we export HEAP8 and HEAPU8 from rts/js/mem.js

- - - - -
0a434a80 by Sylvain Henry at 2025-09-26T10:36:30-04:00
JS: export HEAPU8 (#26290)

This is now required by newer Emscripten versions.

- - - - -
b10296a9 by Andreas Klebinger at 2025-09-26T10:37:11-04:00
sizeExpr: Improve Tick handling.

When determining if we scrutinize a function argument we
now properly look through ticks. Fixes #26444.

- - - - -
d9e2a9a7 by mniip at 2025-09-26T16:00:50-04:00
rts: Refactor parsing of -h flags

We have a nontrivial amount of heap profiling flags available in the
non-profiled runtime, so it makes sense to reuse the parsing code
between the profiled and the non-profiled runtime, only restricting
which flags are allowed.

- - - - -
089e45aa by mniip at 2025-09-26T16:00:50-04:00
rts: Fix parsing of -h options with braces

When the "filter by" -h options were introduced in
bc210f7d267e8351ccb66972f4b3a650eb9338bb, the braces were mandatory.
Then in 3c22fb21fb18e27ce8d941069a6915fce584a526, the braces were made
optional. Then in d1ce35d2271ac8b79cb5e37677b1a989749e611c the brace
syntax stopped working, and no one seems to have noticed.

- - - - -
423f1472 by mniip at 2025-09-26T16:00:50-04:00
rts: add -hT<type> and -hi<table id> heap filtering options (#26361)

They are available in non-profiled builds.

Along the way fixed a bug where combining -he<era> and -hr<retainer>
would ignore whether the retainer matches or not.

- - - - -
4cda4785 by mniip at 2025-09-26T16:00:50-04:00
docs: Document -hT<type> and -hi<addr>

- - - - -
982ad30f by mniip at 2025-09-26T16:00:50-04:00
rts: Refactor dumping the heap census

Always do the printing of the total size right next to where the bucket
label is printed. This prevents accidentally printing a label without
the corresponding amount.

Fixed a bug where exactly this happened for -hi profile and the 0x0
(uncategorized) info table.

There is now also much more symmetry between fprintf(hp_file,...) and
the corresponding traceHeapProfSampleString.

- - - - -
8cbe006a by Cheng Shao at 2025-09-26T16:01:34-04:00
hadrian: fix GHC.Platform.Host generation for cross stage1

This patch fixes incorrectly GHC.Platform.Host generation logic for
cross stage1 in hadrian (#26449). Also adds T26449 test case to
witness the fix.

Co-authored-by: Codex <codex@openai.com>

- - - - -
0ddd0fdc by soulomoon at 2025-09-28T19:24:10-04:00
Remove hptAllInstances usage during upsweep

Previously, during the upsweep phase when
checking safe imports, we were loading the module
interface with runTcInteractive, which in turn calls
hptAllInstances. This accesses non-below modules
from the home package table.

Change the implementation of checkSafeImports
to use initTcWithGbl and loadSysInterface to load the
module interface, since we already have TcGblEnv at hand.
This eliminates the unnecessary use of runTcInteractive
and hptAllInstances during the upsweep phase.

- - - - -
e05c496c by Ben Gamari at 2025-09-28T19:24:59-04:00
base: Update changelog to reflect timing of IOPort# removal

This change will make 9.14 afterall.

- - - - -
bdc9d130 by Cheng Shao at 2025-09-28T19:25:45-04:00
rts: fix wasm JSFFI initialization constructor code

This commit fixes wasm JSFFI initialization constructor code so that
the constructor is self-contained and avoids invoking a fake
__main_argc_argv function. The previous approach of reusing
__main_void logic in wasi-libc saves a tiny bit of code, at the
expense of link-time trouble whenever GHC links a wasm module without
-no-hs-main, in which case the driver-generated main function would
clash with the definition here, resulting in a linker error. It's
simply better to avoid messing with the main function, and it would
additionally allow linking wasm32-wasi command modules that does make
use of synchronous JSFFI.

- - - - -
5d59fc8f by Cheng Shao at 2025-09-28T19:26:27-04:00
rts: provide stub implementations of ExecPage functions for wasm

This patch provides stub implementations of ExecPage functions for
wasm. They are never actually invoked at runtime for any non-TNTC
platform, yet they can cause link-time errors of missing symbols when
the GHCi.InfoTable module gets linked into the final wasm module (e.g.
a GHC API program).

- - - - -
a4d664c7 by Cheng Shao at 2025-09-29T17:29:22+02:00
compiler/ghci: replace the LoadDLL message with LoadDLLs

As a part of #25407, this commit changes the LoadDLL message to
LoadDLLs, which takes a list of DLL paths to load and returns the list
of remote pointer handles. The wasm dyld is refactored to take
advantage of LoadDLLs and harvest background parallelism. On other
platforms, LoadDLLs is based on a fallback codepath that does
sequential loading.

The driver is not actually emitting singular LoadDLLs message with
multiple DLLs yet, this is left in subsequent commits.

Co-authored-by: Codex <codex@openai.com>

- - - - -
c7fc4bae by Cheng Shao at 2025-09-29T17:29:22+02:00
driver: separate downsweep/upsweep phase in loadPackages'

This commit refactors GHC.Linker.Loader.loadPackages' to be separated
into downsweep/upsweep phases:

- The downsweep phase performs dependency analysis and generates a
  list of topologically sorted packages to load
- The upsweep phase sequentially loads these packages by calling
  loadPackage

This is a necessary refactoring to make it possible to make loading of
DLLs concurrent.

- - - - -
ab180104 by Cheng Shao at 2025-09-29T17:57:19+02:00
driver: emit single LoadDLLs message to load multiple DLLs

This commit refactors the driver so that it emits a single LoadDLLs
message to load multiple DLLs in GHC.Linker.Loader.loadPackages'.
Closes #25407.

-------------------------
Metric Increase:
    MultiLayerModulesTH_OneShot
    TcPlugin_RewritePerf
-------------------------

Co-authored-by: Codex <codex@openai.com>

- - - - -
9c304ec0 by Sean D. Gillespie at 2025-09-29T19:57:07-04:00
Fix SIZED_BIN_OP_TY_INT casts in RTS interpreter

Correct `SIZED_BIN_OP_TY_INT` cast to integer. Previously, it cast
its second operand as its parameter `ty`. This does not currently
cause any issues, since we are only using it for bit shifts.

Fixes #26287

- - - - -
a1de535f by Luite Stegeman at 2025-09-30T18:40:28-04:00
rts: Fix lost wakeups in threadPaused for threads blocked on black holes

The lazy blackholing code in threadPaused could overwrite closures
that were already eagerly blackholed, and as such wouldn't have a
marked update frame. If the black hole was overwritten by its
original owner, this would lead to an undetected collision, and
the contents of any existing blocking queue being lost.

This adds a check for eagerly blackholed closures and avoids
overwriting their contents.

Fixes #26324

- - - - -
b7e21e49 by Luite Stegeman at 2025-09-30T18:40:28-04:00
rts: push the correct update frame in stg_AP_STACK

The frame contains an eager black hole (__stg_EAGER_BLACKHOLE_info) so
we should push an stg_bh_upd_frame_info instead of an stg_upd_frame_info.

- - - - -
02a7c18a by Cheng Shao at 2025-09-30T18:41:27-04:00
ghci: fix lookupSymbolInDLL behavior on wasm

This patch fixes lookupSymbolInDLL behavior on wasm to return Nothing
instead of throwing. On wasm, we only have lookupSymbol, and the
driver would attempt to call lookupSymbolInDLL first before falling
back to lookupSymbol, so lookupSymbolInDLL needs to return Nothing
gracefully for the fallback behavior to work.

- - - - -
aa0ca5e3 by Cheng Shao at 2025-09-30T18:41:27-04:00
hadrian/compiler: enable internal-interpreter for ghc library in wasm stage1

This commit enables the internal-interpreter flag for ghc library in
wasm stage1, as well as other minor adjustments to make it actually
possible to launch a ghc api session that makes use of the internal
interpreter. Closes #26431 #25400.

- - - - -
69503668 by Cheng Shao at 2025-09-30T18:41:27-04:00
testsuite: add T26431 test case

This commit adds T26431 to testsuite/tests/ghci-wasm which goes
through the complete bytecode compilation/linking/running pipeline in
wasm, so to witness that the ghc shared library in wasm have full
support for internal-interpreter.

- - - - -
e9445c01 by Matthew Pickering at 2025-09-30T18:42:23-04:00
driver: Load bytecode static pointer entries during linking

Previously the entries were loaded too eagerly, during upsweep, but we
should delay loading them until we know that the relevant bytecode
object is demanded.

Towards #25230

- - - - -
b8307eab by Cheng Shao at 2025-09-30T18:43:14-04:00
autoconf/ghc-toolchain: remove obsolete C99 check

This patch removes obsolete c99 check from autoconf/ghc-toolchain. For
all toolchain & platform combination we support, gnu11 or above is
already supported without any -std flag required, and our RTS already
required C11 quite a few years ago, so the C99 check is completely
pointless.

- - - - -
9c293544 by Simon Peyton Jones at 2025-10-01T09:36:10+01:00
Fix buglet in GHC.Core.Unify.uVarOrFam

We were failing to match two totally-equal types!

This led to #26457.

- - - - -
554487a7 by Rodrigo Mesquita at 2025-10-01T23:04:43-04:00
cleanup: Drop obsolete comment about HsConDetails

HsConDetails used to have an argument representing the type of the
tyargs in a list:

    data HsConDetails tyarg arg rec
      = PrefixCon [tyarg] [arg]

This datatype was shared across 3 synonyms: HsConPatDetails,
HsConDeclH98Details, HsPatSynDetails. In the latter two cases, `tyarg`
was instanced to `Void` meaning the list was always empty for these
cases.

In 7b84c58867edca57a45945a20a9391724db6d9e4, this was refactored such
that HsConDetails no longer needs a type of tyargs by construction. The
first case now represents the type arguments in the args type itself,
with something like:

    ConPat "MkE" [InvisP tp1, InvisP tp2, p1, p2]

So the deleted comment really is just obsolete.

Fixes #26461

- - - - -
6992ac09 by Cheng Shao at 2025-10-02T07:27:55-04:00
testsuite: remove unused expected output files

This patch removes unused expected output files in the testsuites on
platforms that we no longer support.

- - - - -
39eaaaba by Ben Gamari at 2025-10-02T07:28:45-04:00
rts: Dynamically initialize built-in closures

To resolve #26166 we need to eliminate references to undefined symbols
in the runtime system. One such source of these is the runtime's
static references to `I#` and `C#` due the `stg_INTLIKE` and
`stg_CHARLIKE` arrays.

To avoid this we make these dynamic, initializing them during RTS
start-up.

- - - - -
c254c54b by Cheng Shao at 2025-10-02T07:29:33-04:00
compiler: only invoke keepCAFsForGHCi if internal-interpreter is enabled

This patch makes the ghc library only invoke keepCAFsForGHCi if
internal-interpreter is enabled. For cases when it's not (e.g. the
host build of a cross ghc), this avoids unnecessarily retaining all
CAFs in the heap. Also fixes the type signature of c_keepCAFsForGHCi
to match the C ABI.

- - - - -
c9ec4d43 by Simon Hengel at 2025-10-02T18:42:20-04:00
Update copyright in documentation

- - - - -
da9633a9 by Matthew Pickering at 2025-10-02T18:43:04-04:00
loader: Unify loadDecls and loadModuleLinkables functions

These two functions nearly did the same thing. I have refactored them so
that `loadDecls` now calls `loadModuleLinkables`.

Fixes #26459

- - - - -
5db98d80 by Simon Hengel at 2025-10-02T18:43:53-04:00
Fix typo
- - - - -
1275d360 by Matthew Pickering at 2025-10-03T06:05:56-04:00
testsuite: Use ghci_ways to set ways in PackedDataCon/UnboxedTuples/UnliftedDataTypeInterp tests

These tests reimplemented the logic from `valid_way` in order to
determine what ways to run. It's easier to use this combination of
`only_ways` and `extra_ways` to only run in GHCi ways and always run in
GHCi ways.

- - - - -
c06b534b by Matthew Pickering at 2025-10-03T06:06:40-04:00
Rename interpreterBackend to bytecodeBackend

This is preparation for creating bytecode files.

The "interpreter" is one way in which we can run bytecode objects. It is
more accurate to describe that the backend produces bytecode, rather
than the means by which the code will eventually run.

The "interpreterBackend" binding is left as a deprecated alias.

- - - - -
41bdb16f by Andreas Klebinger at 2025-10-06T18:04:34-04:00
Add a perf test for #26425

- - - - -
1da0c700 by Andreas Klebinger at 2025-10-06T18:05:14-04:00
Testsuite: Silence warnings about Wx-partial in concprog001

- - - - -
7471eb6a by sheaf at 2025-10-07T21:39:43-04:00
Improve how we detect user type errors in types

This commit cleans up all the code responsible for detecting whether a
type contains "TypeError msg" applications nested inside it. All the
logic is now in 'userTypeError_maybe', which is always deep. Whether
it looks inside type family applications is determined by the passed-in
boolean flag:

  - When deciding whether a constraint is definitely insoluble, don't
    look inside type family applications, as they may still reduce -- in
    which case the TypeError could disappear.
  - When reporting unsolved constraints, look inside type family
    applications: they had the chance to reduce but didn't, and the
    custom type error might contain valuable information.

All the details are explained in Note [Custom type errors in constraints]
in GHC.Tc.Types.Constraint.

Another benefit of this change is that it allows us to get rid of the
deeply dodgy 'getUserTypeErrorMsg' function.

This commit also improves the detection of custom type errors, for
example in equality constraints:

  TypeError blah ~# rhs

It used to be the case that we didn't detect the TypeError on the LHS,
because we never considered that equality constraints could be insoluble
due to the presence of custom type errors. Addressing this oversight
improves detection of redundant pattern match warnings, fixing #26400.

- - - - -
29955267 by Rodrigo Mesquita at 2025-10-07T21:40:25-04:00
cleanup: Drop obsolete settings from config.mk.in

These values used to be spliced into the bindist's `config.mk` s.t. when
`make` was run, the values were read and written into the bindist installation `settings` file.

However, we now carry these values to the bindist directly in the
default.target toolchain file, and `make` writes almost nothing to
`settings` now (see #26227)

The entries deleted in this MR were already unused.

Fixes #26478

- - - - -
f7adfed2 by ARATA Mizuki at 2025-10-08T08:37:24-04:00
T22033 is only relevant if the word size is 64-bit

Fixes #25497

- - - - -
ff1650c9 by Ben Gamari at 2025-10-08T08:38:07-04:00
rts/posix: Enforce iteration limit on heap reservation logic

Previously we could loop indefinitely when attempting to get an address
space reservation for our heap. Limit the logic to 8 iterations to
ensure we instead issue a reasonable error message.

Addresses #26151.

- - - - -
01844557 by Ben Gamari at 2025-10-08T08:38:07-04:00
rts/posix: Hold on to low reservations when reserving heap

Previously when the OS gave us an address space reservation in low
memory we would immediately release it and try again. However, on some
platforms this meant that we would get the same allocation again in the
next iteration (since mmap's `hint` argument is just that, a hint).

Instead we now hold on to low reservations until we have found a
suitable heap reservation.

Fixes #26151.

- - - - -
b2c8d052 by Sven Tennie at 2025-10-08T08:38:47-04:00
Build terminfo only in upper stages in cross-builds (#26288)

Currently, there's no way to provide library paths for [n]curses for
both - build and target - in cross-builds. As stage0 is only used to
build upper stages, it should be fine to build terminfo only for them.

This re-enables building cross-compilers with terminfo.

- - - - -
c58f9a61 by Julian Ospald at 2025-10-08T08:39:36-04:00
ghc-toolchain: Drop `ld.gold` from merge object command

It's deprecated.

Also see #25716

- - - - -
2b8baada by sheaf at 2025-10-08T18:23:37-04:00
Improvements to 'mayLookIdentical'

This commit makes significant improvements to the machinery that decides
when we should pretty-print the "invisible bits" of a type, such as:

  - kind applications, e.g. '@k' in 'Proxy @k ty'
  - RuntimeReps, e.g. 'TYPE r'
  - multiplicities and linear arrows 'a %1 -> b'

To do this, this commit refactors 'mayLookIdentical' to return **which**
of the invisible bits don't match up, e.g. in

  (a %1 -> b) ~ (a %Many -> b)

we find that the invisible bit that doesn't match up is a multiplicity,
so we should set 'sdocLinearTypes = True' when pretty-printing, and with
e.g.

  Proxy @k1 ~ Proxy @k2

we find that the invisible bit that doesn't match up is an invisible
TyCon argument, so we set 'sdocPrintExplicitKinds = True'.

We leverage these changes to remove the ad-hoc treatment of linearity
of data constructors with 'dataConDisplayType' and 'dataConNonLinearType'.
This is now handled by the machinery of 'pprWithInvisibleBits'.

Fixes #26335 #26340

- - - - -
129ce32d by sheaf at 2025-10-08T18:23:37-04:00
Store SDoc context in SourceError

This commits modifies the SourceError datatype which is used for
throwing and then reporting exceptions by storing all the info we need
to be able to print the SDoc, including whether we should print with
explicit kinds, explicit runtime-reps, etc.

This is done using the new datatype:

  data SourceErrorContext
    = SEC
        !DiagOpts
        !(DiagnosticOpts GhcMessage)

Now, when we come to report an error (by handling the exception), we
have access to the full context we need.

Fixes #26387

- - - - -
f9790ca8 by Ben Gamari at 2025-10-08T18:24:19-04:00
gitlab-ci: Make RELEASE_JOB an input

Rather than an undocumented variable.

- - - - -
14281a22 by Ben Gamari at 2025-10-11T14:06:47-04:00
rts/nonmoving: Fix comment spelling

- - - - -
bedd38b0 by Ben Gamari at 2025-10-11T14:06:47-04:00
rts/nonmoving: Use atomic operations to update bd->flags

- - - - -
215d6841 by Ben Gamari at 2025-10-11T14:06:47-04:00
nonmoving: Use get_itbl instead of explicit loads

This is cleaner and also fixes unnecessary (and unsound) use of
`volatile`.

- - - - -
2c94aa3a by Ben Gamari at 2025-10-11T14:06:47-04:00
rts/Scav: Handle WHITEHOLEs in scavenge_one

`scavenge_one`, used to scavenge mutable list entries, may encounter
`WHITEHOLE`s when the non-moving GC is in use via two paths:

  1. when an MVAR is being marked concurrently
  2. when the object belongs to a chain of selectors being short-cutted.

Fixes #26204.

- - - - -
6bd8155c by Matthew Pickering at 2025-10-11T14:07:29-04:00
Add support for generating bytecode objects

This commit adds the `-fwrite-byte-code` option which makes GHC emit a
`.gbc` file which contains a serialised representation of bytecode.

The bytecode can be loaded by the compiler to avoid having to
reinterpret a module when using the bytecode interpreter (for example,
in GHCi).

There are also the new options:

* -gbcdir=<DIR>: Specify the directory to place the gbc files
* -gbcsuf=<suffix>: Specify the suffix for gbc files

The option `-fbyte-code-and-object-code` now implies
`-fwrite-byte-code`.

These performance tests fail due to https://github.com/haskell/directory/issues/204

-------------------------
Metric Increase:
    MultiComponentModules
    MultiLayerModules
    MultiComponentModulesRecomp
    MultiLayerModulesRecomp
    MultiLayerModulesTH_Make
    MultiLayerModulesTH_OneShot
    T13701
-------------------------

The bytecode serialisation part was implemented by Cheng Shao

Co-authored-by: Cheng Shao <terrorjack@type.dance>

- - - - -
dc8f9599 by Matthew Pickering at 2025-10-11T14:07:30-04:00
Revert "Add a perf test for #26425"

This test has a large memory spike currently, which makes the test
sensitive, since if you allocate a little more or less, the precise
location where GC happens shifts and you observe a different part of the
spike.

Andreas told me to revert the patch for now, and he will add it back
when he fixes the memory spike.

This reverts commit 41bdb16fd083110a06507248f648c507a2feb4af.

- - - - -
e10dcd65 by Sven Tennie at 2025-10-12T10:24:56+00:00
T22859: Increase threadDelay for small machines

The previously used thread delay led to failures on my RISC-V test
setups.

- - - - -
d59ef6b6 by Hai / @BestYeen at 2025-10-14T21:51:14-04:00
Change Alex and Happy m4 scripts to display which version was found in the system, adapt small formatting details in Happy script to be more like the Alex script again.
- - - - -
c98abb6a by Hai / @BestYeen at 2025-10-14T21:52:08-04:00
Update occurrences of return to pure and add a sample for redefining :m to mean :main
- - - - -
70ee825a by Cheng Shao at 2025-10-14T21:52:50-04:00
testsuite: fix T3586 for non-SSE3 platforms

`T3586.hs` contains `-fvia-C -optc-msse3` which I think is a
best-effort basis to harvest the C compiler's auto vectorization
optimizations via the C backend back when the test was added. The
`-fvia-C` part is now a deprecated no-op because GHC can't fall back
to the C backend on a non-unregisterised build, and `-optc-msse3`
might actually cause the test to fail on non x86/x64 platforms, e.g.
recent builds of wasi-sdk would report `wasm32-wasi-clang: error:
unsupported option '-msse3' for target 'wasm32-unknown-wasi'`.

So this patch cleans up this historical cruft. `-fvia-C` is removed,
and `-optc-msse3` is only passed when cpuid contains `pni` (which
indicates support of SSE3).

- - - - -
4be32153 by Teo Camarasu at 2025-10-15T08:06:09-04:00
Add submodules for template-haskell-lift and template-haskell-quasiquoter

These two new boot libraries expose stable subsets of the
template-haskell interface.

This is an implemenation of the GHC proposal https://github.com/ghc-proposals/ghc-proposals/pull/696

Work towards #25262

- - - - -
0c00c9c3 by Ben Gamari at 2025-10-15T08:06:51-04:00
rts: Eliminate uses of implicit constant arrays

Folding of `const`-sized variable-length arrays to a constant-length
array is a gnu extension which clang complains about.

Closes #26502.

- - - - -
bf902a1d by Fendor at 2025-10-15T16:00:59-04:00
Refactor distinct constructor tables map construction

Adds `GHC.Types.Unique.FM.alterUFM_L`, `GHC.Types.Unique.DFM.alterUDFM_L`
`GHC.Data.Word64Map.alterLookup` to support fusion of distinct
constructor data insertion and lookup during the construction of the `DataCon`
map in `GHC.Stg.Debug.numberDataCon`.

Co-authored-by: Fendor <fendor@posteo.de>
Co-authored-by: Finley McIlwaine <finleymcilwaine@gmail.com>

- - - - -
b3585ba1 by Fendor at 2025-10-15T16:00:59-04:00
Allow per constructor refinement of distinct-constructor-tables

Introduce `-fno-distinct-constructor-tables`. A distinct constructor table
configuration is built from the combination of flags given, in order. For
example, to only generate distinct constructor tables for a few specific
constructors and no others, just pass
`-fdistinct-constructor-tables-only=C1,...,CN`.
This flag can be supplied multiple times to extend the set of
constructors to generate a distinct info table for.

You can disable generation of distinct constructor tables for all
configurations by passing `-fno-distinct-constructor-tables`.

The various configurations of these flags is included in the `DynFlags`
fingerprints, which should result in the expected recompilation logic.

Adds a test that checks for distinct tables for various given or omitted
constructors.

Updates CountDepsAst and CountDepsParser tests to account for new dependencies.

Fixes #23703

Co-authored-by: Fendor <fendor@posteo.de>
Co-authored-by: Finley McIlwaine <finleymcilwaine@gmail.com>

- - - - -
e17dc695 by fendor at 2025-10-15T16:01:41-04:00
Fix typos in haddock documentation for stack annotation API

- - - - -
f85058d3 by Zubin Duggal at 2025-10-17T13:50:52+05:30
compiler: Attempt to systematize Unique tags by introducing an ADT for each different tag

Fixes #26264

Metric Decrease:
    T9233

- - - - -
c85c845d by sheaf at 2025-10-17T22:35:32-04:00
Don't prematurely final-zonk PatSyn declarations

This commit makes GHC hold off on the final zonk for pattern synonym
declarations, in 'GHC.Tc.TyCl.PatSyn.tc_patsyn_finish'.
This accommodates the fact that pattern synonym declarations without a
type signature can contain unfilled metavariables, e.g. if the RHS of
the pattern synonym involves view-patterns whose type mentions promoted
(level 0) metavariables. Just like we do for ordinary function bindings,
we should allow these metavariables to be settled later, instead of
eagerly performing a final zonk-to-type.

Now, the final zonking-to-type for pattern synonyms is performed in
GHC.Tc.Module.zonkTcGblEnv.

Fixes #26465

- - - - -
ba3e5bdd by Rodrigo Mesquita at 2025-10-18T16:57:18-04:00
Move code-gen aux symbols from ghc-internal to rts

These symbols were all previously defined in ghc-internal and made the
dependency structure awkward, where the rts may refer to some of these
symbols and had to work around that circular dependency the way
described in #26166.

Moreover, the code generator will produce code that uses these symbols!
Therefore, they should be available in the rts:

PRINCIPLE: If the code generator may produce code which uses this
symbol, then it should be defined in the rts rather than, say,
ghc-internal.

That said, the main motivation is towards fixing #26166.

Towards #26166. Pre-requisite of !14892

- - - - -
f31de2a9 by Ben Gamari at 2025-10-18T16:57:18-04:00
rts: Avoid static symbol references to ghc-internal

This resolves #26166, a bug due to new constraints placed by Apple's
linker on undefined references.

One source of such references in the RTS is the many symbols referenced
in ghc-internal. To mitigate #26166, we make these references dynamic,
as described in Note [RTS/ghc-internal interface].

Fixes #26166

Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>
Co-authored-by: Cheng Shao <terrorjack@type.dance>

- - - - -
43fdfddc by Ben Gamari at 2025-10-18T16:57:18-04:00
compiler: Rename isMathFun -> isLibcFun

This set includes more than just math functions.

- - - - -
4ed5138f by Ben Gamari at 2025-10-18T16:57:18-04:00
compiler: Add libc allocator functions to libc_funs

Prototypes for these are now visible from `Prim.h`, resulting in
multiple-declaration warnings in the unregisterised job.

- - - - -
9a0a076b by Ben Gamari at 2025-10-18T16:57:18-04:00
rts: Minimize header dependencies of Prim.h

Otherwise we will end up with redundant and incompatible declarations
resulting in warnings during the unregisterised build.

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26b8a414 by Diego Antonio  Rosario Palomino at 2025-10-18T16:58:10-04:00
Cmm Parser: Fix incorrect example in comment

The Parser.y file contains a comment with an incorrect example of textual
Cmm (used in .cmm files). This commit updates the comment to ensure it
reflects valid textual Cmm syntax.

Fixes #26313

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d4a9d6d6 by ARATA Mizuki at 2025-10-19T18:43:47+09:00
Handle implications between x86 feature flags

This includes:

* Multiple -msse* options can be specified
* -mavx implies -msse4.2
* -mavx2 implies -mavx
* -mfma implies -mavx
* -mavx512f implies -mavx2 and -mfma
* -mavx512{cd,er,pf} imply -mavx512f

Closes #24989

Co-authored-by: sheaf <sam.derbyshire@gmail.com>

- - - - -
c9b8465c by Cheng Shao at 2025-10-20T10:16:00-04:00
wasm: workaround WebKit bug in dyld

This patch works around a WebKit bug and allows dyld to run on WebKit
based platforms as well. See added note for detailed explanation.

Co-authored-by: Codex <codex@openai.com>

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91b6be10 by Julian Ospald at 2025-10-20T18:21:03-04:00
Improve error handling in 'getPackageArchives'

When the library dirs in the package conf files are not set up correctly,
the JS linker will happily ignore such packages and not link against them,
although they're part of the link plan.

Fixes #26383

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6c5269da by Sven Tennie at 2025-10-20T18:21:44-04:00
Align coding style

Improve readability by using the same style for all constructor calls in
this function.

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3d305889 by Sven Tennie at 2025-10-20T18:21:44-04:00
Reduce complexity by removing joins with mempty

ldArgs, cArgs and cppArgs are all `mempty`. Thus concatenating them adds
nothing but some complexity while reading the code.

- - - - -
38d65187 by Matthew Pickering at 2025-10-21T13:12:20+01:00
Fix stack decoding when using profiled runtime

There are three fixes in this commit.

* We need to replicate the `InfoTable` and `InfoTableProf`
approach for the other stack constants (see the new Stack.ConstantsProf
file).

* Then we need to appropiately import the profiled or non-profiled
  versions.

* Finally, there was an incorrect addition in `stackFrameSize`. We need
  to cast after performing addition on words.

Fixes #26507

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17231bfb by fendor at 2025-10-21T13:12:20+01:00
Add regression test for #26507

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4f5bf93b by Simon Peyton Jones at 2025-10-25T04:05:34-04:00
Postscript to fix for #26255

This MR has comments only

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6ef22fa0 by IC Rainbow at 2025-10-26T18:23:01-04:00
Add SIMD primops for bitwise logical operations

This adds 128-bit wide and/or/xor instructions for X86 NCG,
with both SSE and AVX encodings.

```
andFloatX4# :: FloatX4# -> FloatX4# -> FloatX4#     -- andps / vandps
andDoubleX2# :: DoubleX2# -> DoubleX2# -> DoubleX2# -- andpd / vandpd
andInt8X16# :: Int8X16# -> Int8X16# -> Int8X16#     -- pand / vpand
```

The new primops are available on ARM when using LLVM backend.

Tests added:
- simd015 (floats and doubles)
- simd016 (integers)
- simd017 (words)

Fixes #26417

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fbdc623a by sheaf at 2025-10-26T18:23:52-04:00
Add hints for unsolved HasField constraints

This commit adds hints and explanations for unsolved 'HasField'
constraints.

GHC will now provide additional explanations for an unsolved constraint
of the form 'HasField fld_name rec_ty fld_ty'; the details are laid out in
Note [Error messages for unsolved HasField constraints], but briefly:

  1. Provide similar name suggestions (e.g. mis-spelled field name)
     and import suggestions (record field not in scope).
     These result in actionable 'GhcHints', which is helpful to provide
     code actions in HLS.

  2. Explain why GHC did not solve the constraint, e.g.:

    - 'fld_name' is not a string literal (e.g. a type variable)
    - 'rec_ty' is a TyCon without any fields, e.g. 'Int' or 'Bool'.
    - 'fld_ty' contains existentials variables or foralls.
    - The record field is a pattern synonym field (GHC does not generate
      HasField instances for those).
    - 'HasField' is a custom 'TyCon', not actually the built-in
      'HasField' typeclass from 'GHC.Records'.

On the way, we slightly refactor the mechanisms for import suggestions
in GHC.Rename.Unbound. This is to account for the fact that, for
'HasField', we don't care whether the field is imported qualified or
unqualified. 'importSuggestions' was refactored, we now have
'sameQualImportSuggestions' and 'anyQualImportSuggestions'.

Fixes #18776 #22382 #26480

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99d5707f by sheaf at 2025-10-26T18:23:52-04:00
Rename PatSyn MatchContext to PatSynCtx to avoid punning

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5dc2e9ea by Julian Ospald at 2025-10-27T18:17:23-04:00
Skip uniques test if sources are not available

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544b9ec9 by Vladislav Zavialov at 2025-10-27T18:18:06-04:00
Re-export GHC.Hs.Basic from GHC.Hs

Clean up some import sections in GHC by re-exporting GHC.Hs.Basic
from GHC.Hs.

- - - - -
643ce801 by Julian Ospald at 2025-10-28T18:18:55-04:00
rts: remove unneccesary cabal flags

We perform those checks via proper autoconf macros
instead that do the right thing and then add those
libs to the rts buildinfo.

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d69ea8fe by Vladislav Zavialov at 2025-10-28T18:19:37-04:00
Test case for #17705

Starting with GHC 9.12 (the first release to include 5745dbd3),
all examples in this ticket are handled as expected.

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4038a28b by Andreas Klebinger at 2025-10-30T12:38:52-04:00
Add a perf test for #26425

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f997618e by Andreas Klebinger at 2025-10-30T12:38:52-04:00
OccAnal: Be stricter for better compiler perf.

In particular we are now stricter:

* When combining usageDetails.
* When computing binder info.

In combineUsageDetails when combining the underlying adds we compute a
new `LocalOcc` for each entry by combining the two existing ones.

Rather than wait for those entries to be forced down the road we now
force them immediately. Speeding up T26425 by about 10% with little
effect on the common case.

We also force binders we put into the Core AST everywhere now.
Failure to do so risks leaking the occ env used to set the binders
OccInfo.

For T26425 compiler residency went down by a factor of ~10x.

Compile time also improved by a factor of ~1.6.

-------------------------
Metric Decrease:
    T18698a
    T26425
    T9233
-------------------------

- - - - -
5618645b by Vladislav Zavialov at 2025-10-30T12:39:33-04:00
Fix namespace specifiers in subordinate exports (#12488)

This patch fixes an oversight in the `lookupChildrenExport` function that
caused explicit namespace specifiers of subordinate export items to be
ignored:

  module M (T (type A)) where   -- should be rejected
  data T = A

Based on the `IEWrappedName` data type, there are 5 cases to consider:
1. Unadorned name:   P(X)
2. Named default:    P(default X)
3. Pattern synonym:  P(pattern X)
4. Type name:        P(type X)
5. Data name:        P(data X)

Case 1 is already handled correctly; cases 2 and 3 are parse errors; and
it is cases 4 and 5 that we are concerned with in this patch.

Following the precedent established in `LookupExactName`, we introduce
a boolean flag in `LookupChildren` to control whether to look up in all
namespaces or in a specific one. If an export item is accompanied by an
explicit namespace specifier `type` or `data`, we restrict the lookup in
`lookupGRE` to a specific namespace.

The newly introduced diagnostic `TcRnExportedSubordinateNotFound`
provides error messages and suggestions more tailored to this context
than the previously used `reportUnboundName`.

- - - - -
f75ab223 by Peter Trommler at 2025-10-31T18:43:13-04:00
ghc-toolchain: detect PowerPC 64 bit ABI

Check preprocessor macro defined for ABI v2 and assume v1 otherwise.
Fixes #26521

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d086c474 by Peter Trommler at 2025-10-31T18:43:13-04:00
ghc-toolchain: refactor, move lastLine to Utils

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995dfe0d by Vladislav Zavialov at 2025-10-31T18:43:54-04:00
Tests for -Wduplicate-exports, -Wdodgy-exports

Add test cases for the previously untested diagnostics:

  [GHC-51876] TcRnDupeModuleExport
  [GHC-64649] TcRnNullExportedModule

This also revealed a typo (incorrect capitalization of "module") in the
warning text for TcRnDupeModuleExport, which is now fixed.

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f6961b02 by Cheng Shao at 2025-11-01T00:08:01+01:00
wasm: reformat dyld source code

This commit reformats dyld source code with prettier, to avoid
introducing unnecessary diffs in subsequent patches when they're
formatted before committing.

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0c9032a0 by Cheng Shao at 2025-11-01T00:08:01+01:00
wasm: simplify _initialize logic in dyld

This commit simplifies how we _initialize a wasm shared library in
dyld and removes special treatment for libc.so, see added comment for
detailed explanation.

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ec1b40bd by Cheng Shao at 2025-11-01T00:08:01+01:00
wasm: support running dyld fully client side in the browser

This commit refactors the wasm dyld script so that it can be used to
load and run wasm shared libraries fully client-side in the browser
without needing a wasm32-wasi-ghci backend:

- A new `DyLDBrowserHost` class is exported, which runs in the browser
  and uses the in-memory vfs without any RPC calls. This meant to be
  used to create a `rpc` object for the fully client side use cases.
- The exported `main` function now can be used to load user-specified
  shared libraries, and the user can use the returned `DyLD` instance
  to run their own exported Haskell functions.
- The in-browser wasi implementation is switched to
  https://github.com/haskell-wasm/browser_wasi_shim for bugfixes and
  major performance improvements not landed upstream yet.
- When being run by deno, it now correctly switches to non-nodejs code
  paths, so it's more convenient to test dyld logic with deno.

See added comments for details, as well as the added `playground001`
test case for an example of using it to build an in-browser Haskell
playground.

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8f3e481f by Cheng Shao at 2025-11-01T00:08:01+01:00
testsuite: add playground001 to test haskell playground

This commit adds the playground001 test case to test the haskell
playground in browser, see comments for details.

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af40606a by Cheng Shao at 2025-11-01T00:08:04+01:00
Revert "testsuite: add T26431 test case"

This reverts commit 695036686f8c6d78611edf3ed627608d94def6b7. T26431
is now retired, wasm ghc internal-interpreter logic is tested by
playground001.

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86c82745 by Vladislav Zavialov at 2025-11-01T07:24:29-04:00
Supplant TcRnExportHiddenComponents with TcRnDodgyExports (#26534)

Remove a bogus special case in lookup_ie_kids_all,
making TcRnExportHiddenComponents obsolete.

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fcf6331e by Richard Eisenberg at 2025-11-03T08:33:05+00:00
Refactor fundep solving

This commit is a large-scale refactor of the increasingly-messy code that
handles functional dependencies.  It has virtually no effect on what compiles
but improves error messages a bit.  And it does the groundwork for #23162.

The big picture is described in
    Note [Overview of functional dependencies in type inference]
in GHC.Tc.Solver.FunDeps

* New module GHC.Tc.Solver.FunDeps contains all the fundep-handling
  code for the constraint solver.

* Fundep-equalities are solved in a nested scope; they may generate
  unifications but otherwise have no other effect.
  See GHC.Tc.Solver.FunDeps.solveFunDeps

  The nested needs to start from the Givens in the inert set, but
  not the Wanteds; hence a new function `resetInertCans`, used in
  `nestFunDepsTcS`.

* That in turn means that fundep equalities never show up in error
  messages, so the complicated FunDepOrigin tracking can all disappear.

* We need to be careful about tracking unifications, so we kick out
  constraints from the inert set after doing unifications.  Unification
  tracking has been majorly reformed: see Note [WhatUnifications] in
  GHC.Tc.Utils.Unify.

  A good consequence is that the hard-to-grok `resetUnificationFlag`
  has been replaced with a simpler use of
  `reportCoarseGrainUnifications`

Smaller things:

* Rename `FunDepEqn` to `FunDepEqns` since it contains multiple
  type equalities.

Some compile time improvement

Metrics: compile_time/bytes allocated
                          Baseline
                  Test       value      New value Change
---------------------- --------------------------------------
         T5030(normal) 173,839,232    148,115,248 -14.8% GOOD
hard_hole_fits(normal) 286,768,048    284,015,416  -1.0%

             geo. mean                             -0.2%
             minimum                              -14.8%
             maximum                               +0.3%

Metric Decrease:
    T5030

- - - - -
231adc30 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00
QuickLook's tcInstFun should make instantiation variables directly

tcInstFun must make "instantiation variables", not regular
unification variables, when instantiating function types. That was
previously implemented by a hack: set the /ambient/ level to QLInstTyVar.

But the hack finally bit me, when I was refactoring WhatUnifications.
And it was always wrong: see the now-expunged (TCAPP2) note.

This commit does it right, by making tcInstFun call its own
instantiation functions.  That entails a small bit of duplication,
but the result is much, much cleaner.

- - - - -
39d4a24b by Simon Peyton Jones at 2025-11-03T08:33:05+00:00
Build implication for constraints from (static e)

This commit addresses #26466, by buiding an implication for the
constraints arising from a (static e) form.  The implication has
a special ic_info field of StaticFormSkol, which tells the constraint
solver to use an empty set of Givens.

See (SF3) in Note [Grand plan for static forms]
in GHC.Iface.Tidy.StaticPtrTable

This commit also reinstates an `assert` in GHC.Tc.Solver.Equality.

The test `StaticPtrTypeFamily` was failing with an assertion failure,
but it now works.

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2e2aec1e by Simon Peyton Jones at 2025-11-03T08:33:05+00:00
Comments about defaulting representation equalities

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52a4d1da by Simon Peyton Jones at 2025-11-03T08:33:05+00:00
Improve tracking of rewriter-sets

This refactor substantially improves the treatment of so-called
"rewriter-sets" in the constraint solver.

The story is described in the rewritten
   Note [Wanteds rewrite Wanteds: rewriter-sets]
in GHC.Tc.Types.Constraint

Some highlights

* Trace the free coercion holes of a filled CoercionHole,
  in CoercionPlusHoles.  See Note [Coercion holes] (COH5)

  This avoids taking having to take the free coercion variables
  of a coercion when zonking a rewrriter-set

* Many knock on changes
    * Make fillCoercionHole take CoercionPlusHoles as its argument
      rather than to separate arguments.

    * Similarly setEqIfWanted, setWantedE, wrapUnifierAndEmit.

    * Be more careful about passing the correct CoHoleSet to
      `rewriteEqEvidence` and friends

* Make kickOurAfterFillingCoercionHole more clever. See
  new Note [Kick out after filling a coercion hole]

Smaller matters

* Rename RewriterSet to CoHoleSet
* Add special-case helper `rewriteEqEvidenceSwapOnly`

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3e78e1ba by Simon Peyton Jones at 2025-11-03T08:33:05+00:00
Tidy up constraint solving for foralls

* In `can_eq_nc_forall` make sure to track Givens that are used
  in the nested solve step.

* Tiny missing-swap bug-fix in `lookup_eq_in_qcis`

* Fix some leftover mess from
      commit 14123ee646f2b9738a917b7cec30f9d3941c13de
      Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
      Date:   Wed Aug 20 00:35:48 2025 +0100
      Solve forall-constraints via an implication, again
  Specifically, trySolveImplication is now dead.

- - - - -
973f2c25 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00
Do not treat CoercionHoles as free variables in coercions

This fixes a long-standing wart in the free-variable finder;
now CoercionHoles are no longer treated as a "free variable"
of a coercion.

I got big and unexpected performance regressions when making
this change.  Turned out that CallArity didn't discover that
the free variable finder could be eta-expanded, which gave very
poor code.

So I re-used Note [The one-shot state monad trick] for Endo,
resulting in GHC.Utils.EndoOS.  Very simple, big win.

- - - - -
c2b8a0f9 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00
Update debug-tracing in CallArity

No effect on behaviour, and commented out anyway

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9aa5ee99 by Simon Peyton Jones at 2025-11-03T08:33:28+00:00
Comments only -- remove dangling Note references

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6683f183 by Simon Peyton Jones at 2025-11-03T08:33:28+00:00
Accept error message wibbles

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3ba3d9f9 by Luite Stegeman at 2025-11-04T00:59:41-05:00
rts: fix eager black holes: record mutated closure and fix assertion

This fixes two problems with handling eager black holes, introduced
by a1de535f762bc23d4cf23a5b1853591dda12cdc9.

- the closure mutation must be recorded even for eager black holes,
  since the mutator has mutated it before calling threadPaused

- The assertion that an unmarked eager black hole must be owned by
  the TSO calling threadPaused is incorrect, since multiple threads
  can race to claim the black hole.

fixes #26495

- - - - -
b5508f2c by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00
build: Relax ghc/ghc-boot Cabal bound to 3.16

Fixes #26202

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c5b3541f by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00
cabal-reinstall: Use haddock-api +in-tree-ghc

Fixes #26202

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c6d4b945 by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00
cabal-reinstall: Pass --strict to Happy

This is necessary to make the generated Parser build successfully
This mimics Hadrian, which always passes --strict to happy.

Fixes #26202

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79df1e0e by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00
genprimopcode: Require higher happy version

I've bumped the happy version to forbid deprecated Happy versions which
don't successfully compile.

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fa5d33de by Simon Peyton Jones at 2025-11-05T08:35:40-05:00
Add a HsWrapper optimiser

This MR addresses #26349, by introduceing optSubTypeHsWrapper.
There is a long

   Note [Deep subsumption and WpSubType]

in GHC.Tc.Types.Evidence that explains what is going on.

- - - - -
ea58cae5 by Simon Peyton Jones at 2025-11-05T08:35:40-05:00
Improve mkWpFun_FRR

This commit ensures that `mkWpFun_FRR` directly produces a `FunCo` in
the cases where it can.

(Previously called `mkWpFun` which in turn optimised to a `FunCo`, but
that made the smarts in `mkWpFun` /essential/ rather than (as they
should be) optional.

- - - - -
5cdcfaed by Ben Gamari at 2025-11-06T09:01:36-05:00
compiler: Exclude units with no exposed modules from unused package check

Such packages cannot be "used" in the Haskell sense of the word yet
are nevertheless necessary as they may provide, e.g., C object code or
link flags.

Fixes #24120.

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74b8397a by Brandon Chinn at 2025-11-06T09:02:19-05:00
Replace deprecated argparse.FileType

- - - - -
36ddf988 by Ben Gamari at 2025-11-06T09:03:01-05:00
Bump unix submodule to 2.8.8.0

Closes #26474.

- - - - -
c32b3a29 by fendor at 2025-11-06T09:03:43-05:00
Fix assertion in `postStringLen` to account for \0 byte

We fix the assertion to handle trailing \0 bytes in `postStringLen`.
Before this change, the assertion looked like this:

    ASSERT(eb->begin + eb->size > eb->pos + len + 1);

Let's assume some values to see why this is actually off by one:

    eb->begin = 0
    eb->size  = 1
    eb->pos   = 0

    len       = 1

then the assertion would trigger correctly:

    0 + 1 > 0 + 1 + 1 => 1 > 2 => false

as there is not enough space for the \0 byte (which is the trailing +1).
However, if we change `eb->size = 2`, then we do have enough space for a
string of length 1, but the assertion still fails:

    0 + 2 > 0 + 1 + 1 => 2 > 2 => false

Which causes the assertion to fail if there is exactly enough space for
the string with a trailing \0 byte.

Clearly, the assertion should be `>=`!
If we switch around the operand, it should become more obvious that `<=`
is the correct comparison:

    ASSERT(eb->pos + len + 1 <= eb->begin + eb->size);

This is expresses more naturally that the current position plus the
length of the string (and the null byte) must be smaller or equal to the
overall size of the buffer.

This change also is in line with the implementation in
`hasRoomForEvent` and `hasRoomForVariableEvent`:

  ```
  StgBool hasRoomForEvent(EventsBuf *eb, EventTypeNum eNum)
  {
    uint32_t size = ...;
    if (eb->pos + size > eb->begin + eb->size)
    ...
  ```

the check `eb->pos + size > eb->begin + eb->size` is identical to
`eb->pos + size <= eb->begin + eb->size` plus a negation.

- - - - -
3034a6f2 by Ben Gamari at 2025-11-06T09:04:24-05:00
Bump os-string submodule to 2.0.8

- - - - -
39567e85 by Cheng Shao at 2025-11-06T09:05:06-05:00
rts: use computed goto for instruction dispatch in the bytecode interpreter

This patch uses computed goto for instruction dispatch in the bytecode
interpreter. Previously instruction dispatch is done by a classic
switch loop, so executing the next instruction requires two jumps: one
to the start of the switch loop and another to the case block based on
the instruction tag. By using computed goto, we can build a jump table
consisted of code addresses indexed by the instruction tags
themselves, so executing the next instruction requires only one jump,
to the destination directly fetched from the jump table.

Closes #12953.

- - - - -
93fc7265 by sheaf at 2025-11-06T21:33:24-05:00
Correct hasFixedRuntimeRep in matchExpectedFunTys

This commit fixes a bug in the representation-polymormorphism check in
GHC.Tc.Utils.Unify.matchExpectedFunTys. The problem was that we put
the coercion resulting from hasFixedRuntimeRep in the wrong place,
leading to the Core Lint error reported in #26528.

The change is that we have to be careful when using 'mkWpFun': it
expects **both** the expected and actual argument types to have a
syntactically fixed RuntimeRep, as explained in Note [WpFun-FRR-INVARIANT]
in GHC.Tc.Types.Evidence.

On the way, this patch improves some of the commentary relating to
other usages of 'mkWpFun' in the compiler, in particular in the view
pattern case of 'tc_pat'. No functional changes, but some stylistic
changes to make the code more readable, and make it easier to understand
how we are upholding the WpFun-FRR-INVARIANT.

Fixes #26528

- - - - -
c052c724 by Simon Peyton Jones at 2025-11-06T21:34:06-05:00
Fix a horrible shadowing bug in implicit parameters

Fixes #26451.  The change is in GHC.Tc.Solver.Monad.updInertDicts
where we now do /not/ delete /Wanted/ implicit-parameeter constraints.

This bug has been in GHC since 9.8!  But it's quite hard to provoke;
I contructed a tests in T26451, but it was hard to do so.

- - - - -
b253013e by Georgios Karachalias at 2025-11-07T17:21:57-05:00
Remove the `CoreBindings` constructor from `LinkablePart`

Adjust HscRecompStatus to disallow unhydrated WholeCoreBindings
from being passed as input to getLinkDeps (which would previously
panic in this case).

Fixes #26497

- - - - -
ac7b737e by Sylvain Henry at 2025-11-07T17:22:51-05:00
Testsuite: pass ext-interp test way (#26552)

Note that some tests are still marked as broken with the ext-interp way
(see #26552 and #14335)

- - - - -
3c2f4bb4 by sheaf at 2025-11-11T11:47:28-05:00
Preserve user-written kinds in data declarations

This commit ensures that we preserve the user-written kind for data
declarations, e.g. in

  type T2T = Type -> Type
  type D :: T2T
  data D a where { .. }

that we preserve the user-written kind of D as 'T2T', instead of
expanding the type synonym 'T2T' during kind checking.

We do this by storing 'tyConKind' separately from 'tyConResKind'. This
means that 'tyConKind' is not necessarily equal to
'mkTyConKind binders res_kind', as e.g. in the above example the former
is 'T2T' while the latter is 'Type -> Type'.

This is explained in Note [Preserve user-written TyCon kind] in GHC.Core.TyCon.

This is particularly important for Haddock, as the kinds stored in
interface files affect the generated documentation, and we want to
preserve the user-written types as much as possible.

- - - - -
19859584 by sheaf at 2025-11-11T11:47:28-05:00
Store user-written datacon tvs in interface files

This commit ensures we store the user-written quantified type variables
of data constructors in interface files, e.g. in

  data D a where
    MkD1 :: forall x. x -> D x
    MkD2 :: forall u v. u -> v -> D v

The previous behaviour was to rename the universal variables to match
the universal variables of the data constructor. This was undesirable
because the names that end up in interface files end up mattering for
generated Haddock documentation; it's better to preserve the user-written
type variables.

Moreover, the universal variables may not have been user-written at all,
e.g. in an example such as:

  type T2T = Type -> Type
  data G :: T2T where
    MkG :: forall x. D x

Here GHC will invent the type variable name 'a' for the first binder of
the TyCon G. We really don't want to then rename the user-written 'x'
into the generated 'a'.

- - - - -
034b2056 by sheaf at 2025-11-11T11:47:28-05:00
DataCon univ_tvs names: pick TyCon over inferred

This commit changes how we compute the names of universal type variables
in GADT data constructors. This augments the existing logic that chose
which type variable name to use, in GHC.Tc.TyCl.mkGADTVars. We continue
to prefer DataCon tv names for user-written binders, but we now prefer
TyCon tv names for inferred (non-user-written) DataCon binders.

This makes a difference in examples such as:

  type (:~~:) :: k1 -> k2 -> Type
  data a :~~: b where
    HRefl :: a :~~: a

Before this patch, we ended up giving HRefl the type:

  forall {k2}. forall (a :: k2). a :~~: a

whereas we now give it the type:

  forall {k1}. forall (a :: k1). a :~~: a

The important part isn't really 'k1' or 'k2', but more that the inferred
type variable names of the DataCon can be arbitrary/unpredictable (as
they are chosen by GHC and depend on how unification proceeds), so it's
much better to use the more predictable TyCon type variable names.

- - - - -
95078d00 by sheaf at 2025-11-11T11:47:28-05:00
Backpack Rename: use explicit record construction

This commit updates the Backpack boilerplate in GHC.Iface.Rename to
use explicit record construction rather than record update. This makes
sure that the code stays up to date when the underlying constructors
change (e.g. new fields are added). The rationale is further explained
in Note [Prefer explicit record construction].

- - - - -
2bf36263 by sheaf at 2025-11-11T11:47:28-05:00
Store # eta binders in TyCon and use for Haddock

This commit stores the number of TyCon binders that were introduced by
eta-expansion (by the function GHC.Tc.Gen.HsType.splitTyConKind).

This is then used to pretty-print the TyCon as the user wrote it, e.g.
for

  type Effect :: (Type -> Type) -> Type -> Type
  data State s :: Effect where {..} -- arity 3

GHC will eta-expand the data declaration to

  data State s a b where {..}

but also store in the 'TyCon' that the number of binders introduced by
this eta expansion is 2. This allows us, in
'Haddock.Convert.synifyTyConKindSig', to recover the original user-written
syntax, preserving the user's intent in Haddock documentation.

See Note [Inline kind signatures with GADTSyntax] in Haddock.Convert.

- - - - -
6c91582f by Matthew Pickering at 2025-11-11T11:48:12-05:00
driver: Properly handle errors during LinkNode steps

Previously we were not properly catching errors during the LinkNode step
(see T9930fail test).

This is fixed by wrapping the `LinkNode` action in `wrapAction`, the
same handler which is used for module compilation.

Fixes #26496

- - - - -
e1e1eb32 by Matthew Pickering at 2025-11-11T11:48:54-05:00
driver: Remove unecessary call to hscInsertHPT

This call was left-over from e9445c013fbccf9318739ca3d095a3e0a2e1be8a

If you follow the functions which call `upsweep_mod`, they immediately
add the interface to the HomePackageTable when `upsweep_mod` returns.

- - - - -
b22777d4 by ARATA Mizuki at 2025-11-11T11:49:44-05:00
LLVM backend: Pass the +evex512 attribute to LLVM 18+ if -mavx512f is set

The newer LLVM requires the +evex512 attribute to enable use of ZMM registers.
LLVM exhibits a backward-compatible behavior if the cpu is `x86-64`, but not if `penryn`.
Therefore, on macOS, where the cpu is set to `penryn`, we need to explicitly pass +evex512.

Fixes #26410

- - - - -
6ead7d06 by Vladislav Zavialov at 2025-11-11T11:50:26-05:00
Comments only in GHC.Parser.PostProcess.Haddock

Remove outdated Note [Register keyword location], as the issue it describes
was addressed by commit 05eb50dff2fcc78d025e77b9418ddb369db49b9f.

- - - - -
43fa8be8 by sheaf at 2025-11-11T11:51:18-05:00
localRegistersConflict: account for assignment LHS

This commit fixes a serious oversight in GHC.Cmm.Sink.conflicts,
specifically the code that computes which local registers conflict
between an assignment and a Cmm statement.

If we have:

  assignment: <local_reg> = <expr>
        node: <local_reg> = <other_expr>

then clearly the two conflict, because we cannot move one statement past
the other, as they assign two different values to the same local
register. (Recall that 'conflicts (local_reg,expr) node' is False if and
only if the assignment 'local_reg = expr' can be safely commuted past
the statement 'node'.)

The fix is to update 'GHC.Cmm.Sink.localRegistersConflict' to take into
account the following two situations:

  (1) 'node' defines the LHS local register of the assignment,
  (2) 'node' defines a local register used in the RHS of the assignment.

The bug is precisely that we were previously missing condition (1).

Fixes #26550

- - - - -
79dfcfe0 by sheaf at 2025-11-11T11:51:18-05:00
Update assigned register format when spilling

When we come to spilling a register to put new data into it, in
GHC.CmmToAsm.Reg.Linear.allocRegsAndSpill_spill, we need to:

  1. Spill the data currently in the register. That is, do a spill
     with a format that matches what's currently in the register.
  2. Update the register assignment, allocating a virtual register to
     this real register, but crucially **updating the format** of this
     assignment.

Due to shadowing in the Haskell code for allocRegsAndSpill_spill, we
were mistakenly re-using the old format. This could lead to a situation
where:

  a. We were using xmm6 to store a Double#.
  b. We want to store a DoubleX2# into xmm6, so we spill the current
     content of xmm6 to the stack using a scalar move (correct).
  c. We update the register assignment, but we fail to update the format
     of the assignment, so we continue to think that xmm6 stores a
     Double# and not a DoubleX2#.
  d. Later on, we need to spill xmm6 because it is getting clobbered by
     another instruction. We then decide to only spill the lower 64 bits
     of the register, because we still think that xmm6 only stores a
     Double# and not a DoubleX2#.

Fixes #26542

- - - - -
aada5db9 by ARATA Mizuki at 2025-11-11T11:52:07-05:00
Fix the order of spill/reload instructions

The AArch64 NCG could emit multiple instructions for a single spill/reload,
but their order was not consistent between the definition and a use.

Fixes #26537

Co-authored-by: sheaf <sam.derbyshire@gmail.com>

- - - - -
64ec82ff by Andreas Klebinger at 2025-11-11T11:52:48-05:00
Add hpc to release script

- - - - -
741da00c by Ben Gamari at 2025-11-12T03:38:20-05:00
template-haskell: Better describe getQ semantics

Clarify that the state is a type-indexed map, as suggested by #26484.
- - - - -
8b080e04 by ARATA Mizuki at 2025-11-12T03:39:11-05:00
Fix incorrect markups in the User's Guide

* Correct markup for C--: "C-\-" in reST
* Fix internal links
* Fix code highlighting
* Fix inline code: Use ``code`` rather than `code`
* Remove extra backslashes

Fixes #16812

Co-authored-by: sheaf <sam.derbyshire@gmail.com>

- - - - -
a00840ea by Simon Peyton Jones at 2025-11-14T15:23:56+00:00
Make TYPE and CONSTRAINT apart again

This patch finally fixes #24279.

* The story started with #11715

* Then #21623 articulated a plan, which made Type and Constraint
  not-apart; a horrible hack but it worked. The main patch was
     commit 778c6adca2c995cd8a1b84394d4d5ca26b915dac
     Author: Simon Peyton Jones <simonpj@microsoft.com>
     Date:   Wed Nov 9 10:33:22 2022 +0000

     Type vs Constraint: finally nailed

* #24279 reported a bug in the above big commit; this small patch fixes it
    commit af6932d6c068361c6ae300d52e72fbe13f8e1f18
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Mon Jan 8 10:49:49 2024 +0000

    Make TYPE and CONSTRAINT not-apart

    Issue #24279 showed up a bug in the logic in GHC.Core.Unify.unify_ty
    which is supposed to make TYPE and CONSTRAINT be not-apart.

* Then !10479 implemented "unary classes".

* That change in turn allows us to make Type and Constraint apart again,
  cleaning up the compiler and allowing a little bit more expressiveness.

  It fixes the original hope in #24279, namely that `Type` and `Constraint`
  should be distinct throughout.

- - - - -
c0a1e574 by Georgios Karachalias at 2025-11-15T05:14:31-05:00
Report all missing modules with -M

We now report all missing modules at once in GHC.Driver.Makefile.processDeps,
as opposed to only reporting a single missing module. Fixes #26551.

- - - - -
c9fa3449 by Sylvain Henry at 2025-11-15T05:15:26-05:00
JS: fix array index for registers

We used to store R32 in h$regs[-1]. While it's correct in JavaScript,
fix this to store R32 in h$regs[0] instead.

- - - - -
9e469909 by Sylvain Henry at 2025-11-15T05:15:26-05:00
JS: support more than 128 registers (#26558)

 The JS backend only supported 128 registers (JS variables/array slots
 used to pass function arguments). It failed in T26537 when 129
 registers were required.

This commit adds support for more than 128 registers: it is now limited to
maxBound :: Int (compiler's Int). If we ever go above this threshold the
compiler now panics with a more descriptive message.

A few built-in JS functions were assuming 128 registers and have been
rewritten to use loops. Note that loops are only used for "high"
registers that are stored in an array: the 31 "low" registers are still
handled with JS global variables and with explicit switch-cases to
maintain good performance in the most common cases (i.e. few registers
used). Adjusting the number of low registers is now easy: just one
constant to adjust (GHC.StgToJS.Regs.lowRegsCount).

No new test added: T26537 is used as a regression test instead.

- - - - -
0a64a78b by Sven Tennie at 2025-11-15T20:31:10-05:00
AArch64: Simplify CmmAssign and CmmStore

The special handling for floats was fake: The general case is always
used. So, the additional code path isn't needed (and only adds
complexity for the reader.)

- - - - -
15b311be by sheaf at 2025-11-15T20:32:02-05:00
SimpleOpt: refactor & push coercions into lambdas

This commit improves the simple optimiser (in GHC.Core.SimpleOpt)
in a couple of ways:

  - The logic to push coercion lambdas is shored up.

    The function 'pushCoercionIntoLambda' used to be called in 'finish_app',
    but this meant we could not continue to optimise the program after
    performing this transformation.

    Now, we call 'pushCoercionIntoLambda' as part of 'simple_app'.
    Doing so can be important when dealing with unlifted newtypes,
    as explained in  Note [Desugaring unlifted newtypes].

  - The code is re-structured to avoid duplication and out-of-sync
    code paths.

    Now, 'simple_opt_expr' defers to 'simple_app' for the 'App', 'Var',
    'Cast' and 'Lam' cases. This means all the logic for those is
    centralised in a single place (e.g. the 'go_lam' helper function).

    To do this, the general structure is brought a bit closer to the
    full-blown simplifier, with a notion of 'continuation'
    (see 'SimpleContItem').

This commit also modifies GHC.Core.Opt.Arity.pushCoercionIntoLambda to
apply a substitution (a slight generalisation of its existing implementation).

- - - - -
b33284c7 by sheaf at 2025-11-15T20:32:02-05:00
Improve typechecking of data constructors

This commit changes the way in which we perform typecheck data
constructors, in particular how we make multiplicities line up.

Now, impedance matching occurs as part of the existing subsumption
machinery. See the revamped Note [Typechecking data constructors] in
GHC.Tc.Gen.App, as well as Note [Polymorphisation of linear fields]
in GHC.Core.Multiplicity.

This allows us to get rid of a fair amount of hacky code that was
added with the introduction of LinearTypes; in particular the logic of
GHC.Tc.Gen.Head.tcInferDataCon.

-------------------------
Metric Decrease:
    T10421
    T14766
    T15164
    T15703
    T19695
    T5642
    T9630
    WWRec
-------------------------

- - - - -
b6faf5d0 by sheaf at 2025-11-15T20:32:02-05:00
Handle unsaturated rep-poly newtypes

This commit allows GHC to handle unsaturated occurrences of unlifted
newtype constructors. The plan is detailed in
Note [Eta-expanding rep-poly unlifted newtypes]
in GHC.Tc.Utils.Concrete: for unsaturated unlifted newtypes, we perform
the appropriate representation-polymorphism check in tcInstFun.

- - - - -
682bf979 by Mike Pilgrem at 2025-11-16T16:44:14+00:00
Fix #26293 Valid stack.yaml for hadrian

- - - - -
acc70c3a by Simon Peyton Jones at 2025-11-18T16:21:20-05:00
Fix a bug in defaulting

Addresses #26582

Defaulting was doing some unification but then failing to
iterate. Silly.

I discovered that the main solver was unnecessarily iterating even
if there was a unification for an /outer/ unification variable, so
I fixed that too.

- - - - -
c12fa73e by Simon Peyton Jones at 2025-11-19T02:55:01-05:00
Make PmLit be in Ord, and use it in Map

This MR addresses #26514, by changing from

    data PmAltConSet = PACS !(UniqDSet ConLike) ![PmLit]
  to
    data PmAltConSet = PACS !(UniqDSet ConLike) !(Map PmLit PmLit)

This matters when doing pattern-match overlap checking, when there
is a very large set of patterns.  For most programs it makes
no difference at all.

For the N=5000 case of the repro case in #26514, compiler
mutator time (with `-fno-code`) goes from 1.9s to 0.43s.

All for the price for an Ord instance for PmLit

- - - - -
41b84f40 by sheaf at 2025-11-19T02:55:52-05:00
Add passing tests for #26311 and #26072

This commit adds two tests cases that now pass since landing the changes
to typechecking of data constructors in b33284c7.

Fixes #26072 #26311

- - - - -
1faa758a by sheaf at 2025-11-19T02:55:52-05:00
mkCast: weaken bad cast warning for multiplicity

This commit weakens the warning message emitted when constructing a bad
cast in mkCast to ignore multiplicity.

Justification: since b33284c7, GHC uses sub-multiplicity coercions to
typecheck data constructors. The coercion optimiser is free to discard
these coercions, both for performance reasons, and because GHC's Core
simplifier does not (yet) preserve linearity.
We thus weaken 'mkCast' to use 'eqTypeIgnoringMultiplicity' instead of
'eqType', to avoid getting many spurious warnings about mismatched
multiplicities.

- - - - -
55eab80d by Sylvain Henry at 2025-11-20T17:33:13-05:00
Build external interpreter program on demand (#24731)

This patch teaches GHC how to build the external interpreter program
when it is missing. As long as we have the `ghci` library, doing this is
trivial so most of this patch is refactoring for doing it sanely.

- - - - -
08bbc028 by Rodrigo Mesquita at 2025-11-20T17:33:54-05:00
Add tests for #23973 and #26565

These were fixed by 4af4f0f070f83f948e49ad5d7835fd91b8d3f0e6 in !10417

- - - - -
6b42232c by sheaf at 2025-11-20T17:34:35-05:00
Mark T26410_ffi as fragile on Windows

As seen in #26595, this test intermittently fails on Windows.
This commit marks it as fragile, until we get around to fixing it.

- - - - -
b7b7c049 by Andrew Lelechenko at 2025-11-21T21:04:01+00:00
Add nubOrd / nubOrdBy to Data.List and Data.List.NonEmpty

As per https://github.com/haskell/core-libraries-committee/issues/336

- - - - -
352d5462 by Marc Scholten at 2025-11-22T10:33:03-05:00
Fix haddock test runner to handle UTF-8 output

xhtml 3000.4.0.0 now produces UTF-8 output instead of escaping non-ASCII characters.

When using --test-accept it previously wrote files in the wrong encoding
because they have not been decoded properly when reading the files.

- - - - -
48a3ed57 by Simon Peyton Jones at 2025-11-25T15:33:54+00:00
Add a fast-path for args=[] to occAnalApp

In the common case of having not arguments, occAnalApp
was doing redundant work.

- - - - -
951e5ed9 by Simon Peyton Jones at 2025-11-25T15:33:54+00:00
Fix a performance hole in the occurrence analyser

As #26425 showed, the clever stuff in

   Note [Occurrence analysis for join points]

does a lot of duplication of usage details.  This patch
improved matters with a little fancy footwork.  It is
described in the new (W4) of the same Note.

Compile-time allocations go down slightly. Here are the changes
of +/- 0.5% or more:

    T13253(normal)    329,369,244    326,395,544  -0.9%
T13253-spj(normal)     66,410,496     66,095,864  -0.5%
    T15630(normal)    129,797,200    128,663,136  -0.9%
   T15630a(normal)    129,212,408    128,027,560  -0.9%
    T16577(normal)  6,756,706,896  6,723,028,512  -0.5%
    T18282(normal)    128,462,070    125,808,584  -2.1% GOOD
   T18698a(normal)    208,418,305    202,037,336  -3.1% GOOD
    T18730(optasm)    136,981,756    136,208,136  -0.6%
    T18923(normal)     58,103,088     57,745,840  -0.6%
    T19695(normal)  1,386,306,272  1,365,609,416  -1.5%
    T26425(normal)  3,344,402,957  2,457,811,664 -26.5% GOOD
     T6048(optasm)     79,763,816     79,212,760  -0.7%
     T9020(optasm)    225,278,408    223,682,440  -0.7%
     T9961(normal)    303,810,717    300,729,168  -1.0% GOOD

         geo. mean                                -0.5%
         minimum                                 -26.5%
         maximum                                  +0.4%

Metric Decrease:
    T18282
    T18698a
    T26425
    T9961

- - - - -
f1959dfc by Simon Peyton Jones at 2025-11-26T11:58:07+00:00
Remove a quadratic-cost assertion check in mkCoreApp

See the new Note [Assertion checking in mkCoreApp]

- - - - -
98fa0d36 by Simon Hengel at 2025-11-27T17:54:57-05:00
Fix typo in docs/users_guide/exts/type_families.rst

- - - - -
5b97e5ce by Simon Hengel at 2025-11-27T17:55:37-05:00
Fix broken RankNTypes example in user's guide

- - - - -
fa2aaa00 by Simon Peyton Jones at 2025-11-27T17:56:18-05:00
Switch off specialisation in ExactPrint

In !15057 (where we re-introduced -fpolymoprhic-specialisation) we found
that ExactPrint's compile time blew up by a factor of 5.  It turned out
to be caused by bazillions of specialisations of `markAnnotated`.

Since ExactPrint isn't perf-critical, it does not seem worth taking
the performance hit, so this patch switches off specialisation in
this one module.

- - - - -
1fd25987 by Simon Peyton Jones at 2025-11-27T17:56:18-05:00
Switch -fpolymorphic-specialisation on by default

This patch addresses #23559.

Now that !10479 has landed and #26329 is fixed, we can switch on
polymorphic specialisation by default, addressing a bunch of other
tickets listed in #23559.

Metric changes:
  * CoOpt_Singleton: +4% compiler allocations: we just get more
    specialisations

  * info_table_map_perf: -20% decrease in compiler allocations.
    This is caused by using -fno-specialise in ExactPrint.hs
    Without that change we get a 4x blow-up in compile time;
    see !15058 for details

Metric Decrease:
    info_table_map_perf
Metric Increase:
    CoOpt_Singletons

- - - - -
b7fe7445 by Matthew Pickering at 2025-11-27T17:56:59-05:00
rts: Fix a deadlock with eventlog flush interval and RTS shutdown

The ghc_ticker thread attempts to flush at the eventlog tick interval, this requires
waiting to take all capabilities.

At the same time, the main thread is shutting down, the schedule is
stopped and then we wait for the ticker thread to finish.

Therefore we are deadlocked.

The solution is to use `newBoundTask/exitMyTask`, so that flushing can
cooperate with the scheduler shutdown.

Fixes #26573

- - - - -
1d4a1229 by sheaf at 2025-11-27T17:58:02-05:00
SimpleOpt: don't subst in pushCoercionIntoLambda

It was noticed in #26589 that the change in 15b311be was incorrect:
the simple optimiser carries two different substitution-like pieces of
information: 'soe_subst' (from InVar to OutExpr) and 'soe_inl'
(from InId to InExpr). It is thus incorrect to have 'pushCoercionIntoLambda'
apply the substitution from 'soe_subst' while discarding 'soe_inl'
entirely, which is what was done in 15b311be.

Instead, we change back pushCoercionIntoLambda to take an InScopeSet,
and optimise the lambda before calling 'pushCoercionIntoLambda' to avoid
mixing InExpr with OutExpr, or mixing two InExpr with different
environments. We can then call 'soeZapSubst' without problems.

Fixes #26588 #26589

- - - - -
84a087d5 by Sylvain Henry at 2025-11-28T17:35:28-05:00
Fix PIC jump tables on Windows (#24016)

Avoid overflows in jump tables by using a base label closer to the jump
targets. See added Note [Jump tables]

- - - - -
82db7042 by Zubin Duggal at 2025-11-28T17:36:10-05:00
rts/linker/PEi386: Copy strings before they are inserted into LoadedDllCache. The original strings are temporary and might be freed at an arbitrary point.

Fixes #26613

- - - - -
ff3f0d09 by Ben Gamari at 2025-11-29T18:34:28-05:00
gitlab-ci: Run ghcup-metadata jobs on OpenCape runners

This significantly reduces our egress traffic
and makes the jobs significantly faster.
- - - - -
ef0dc33b by Matthew Pickering at 2025-11-29T18:35:10-05:00
Use 'OsPath' in getModificationTimeIfExists

This part of the compiler is quite hot during recompilation checking in
particular since the filepaths will be translated to a string. It is
better to use the 'OsPath' native function, which turns out to be easy
to do.

- - - - -
fa3bd0a6 by Georgios Karachalias at 2025-11-29T18:36:05-05:00
Use OsPath in PkgDbRef and UnitDatabase, not FilePath

- - - - -
0d7c05ec by Ben Gamari at 2025-12-01T03:13:46-05:00
hadrian: Place user options after package arguments

This makes it easier for the user to override the default package
arguments with `UserSettings.hs`.

Fixes #25821.

-------------------------
Metric Decrease:
    T14697
-------------------------

- - - - -
3b2c4598 by Vladislav Zavialov at 2025-12-01T03:14:29-05:00
Namespace-specified wildcards in import/export lists (#25901)

This change adds support for top-level namespace-specified wildcards
`type ..` and `data ..` to import and export lists.

Examples:
  import M (type ..) -- imports all type and class constructors from M
  import M (data ..) -- imports all data constructors and terms from M
  module M (type .., f) where
    -- exports all type and class constructors defined in M,
    -- plus the function 'f'

The primary intended usage of this feature is in combination with module
aliases, allowing namespace disambiguation:
  import Data.Proxy as T (type ..)  -- T.Proxy is unambiguously the type constructor
  import Data.Proxy as D (data ..)  -- D.Proxy is unambiguously the data constructor

The patch accounts for the interactions of wildcards with:
* Imports with `hiding` clauses
* Import warnings -Wunused-imports, -Wdodgy-imports
* Export warnings -Wduplicate-exports, -Wdodgy-exports

Summary of the changes:

1. Move the NamespaceSpecifier type from GHC.Hs.Binds to GHC.Hs.Basic,
   making it possible to use it in more places in the AST.

2. Extend the AST (type: IE) with a representation of `..`, `type ..`,
   and `data ..` (constructor: IEWholeNamespace). Per the proposal, the
   plain `..` is always rejected with a dedicated error message.

3. Extend the grammar in Parser.y with productions for `..`, `type ..`,
   and `data ..` in both import and export lists.

4. Implement wildcard imports by updating the `filterImports` function
   in GHC.Rename.Names; the logic for IEWholeNamespace is roughly
   modeled after the Nothing (no explicit import list) case.

5. Implement wildcard exports by updating the `exports_from_avail`
   function in GHC.Tc.Gen.Export; the logic for IEWholeNamespace is
   closely modeled after the IEModuleContents case.

6. Refactor and extend diagnostics to report the new warnings and
   errors. See PsErrPlainWildcardImport, DodgyImportsWildcard,
               PsErrPlainWildcardExport, DodgyExportsWildcard,
               TcRnDupeWildcardExport.

Note that this patch is specifically about top-level import/export
items. Subordinate import/export items are left unchanged.

- - - - -
c71faa76 by Luite Stegeman at 2025-12-01T03:16:05-05:00
rts: Handle overflow of ELF section header string table

If the section header string table is stored in a section greater
than or equal to SHN_LORESERVE (0xff00), the 16-bit field e_shstrndx
in the ELF header does not contain the section number, but rather
an overflow value SHN_XINDEX (0xffff) indicating that we need to look
elsewhere.

This fixes the linker by not using e_shstrndx directly but calling
elf_shstrndx, which correctly handles the SHN_XINDEX value.

Fixes #26603

- - - - -
ab20eb54 by Mike Pilgrem at 2025-12-01T22:46:55+00:00
Re CLC issue 292 Warn GHC.Internal.List.{init,last} are partial

Also corrects the warning for `tail` to refer to `Data.List.uncons` (like the existing warning for `head`).

In module `Settings.Warnings`, applies `-Wno-x-partial` to the `filepath`, and `parsec` packages (outside GHC's repository).

Also bumps submodules.

- - - - -
fc1d7f79 by Jade Lovelace at 2025-12-02T11:04:09-05:00
docs: fix StandaloneKindSignatures in DataKinds docs

These should be `type` as otherwise GHC reports a duplicate definition
error.

- - - - -
beae879b by Rodrigo Mesquita at 2025-12-03T15:42:37+01:00
task: Substitute some datatypes for newtypes

* Substitutes some data type declarations for newtype declarations
* Adds comment to `LlvmConfigCache`, which must decidedly not be a
  newtype.

Fixes #23555

- - - - -
3bd7dd44 by mangoiv at 2025-12-04T04:36:45-05:00
Renamer: reinstate the template haskell level check in notFound

Out-of-scope names might be caused by a staging error, as is explained by
Note [Out of scope might be a staging error] in GHC.Tc.Utils.Env.hs.
This logic was assumed to be dead code after 217caad1 and has thus been
removed. This commit reintroduces it and thus fixes issue #26099.

- - - - -
0318010b by Zubin Duggal at 2025-12-04T04:37:27-05:00
testlib: Optionally include the way name in the expected output file

This allows us to have different outputs for different ways.

- - - - -
6d945fdd by Zubin Duggal at 2025-12-04T04:37:27-05:00
testsuite: Accept output of tests failing in ext-interp way due to differing compilation requirements

Fixes #26552

- - - - -
0ffc5243 by Cheng Shao at 2025-12-04T04:38:09-05:00
devx: minor fixes for compile_flags.txt

This patch includes minor fixes for compile_flags.txt to improve
developer experience when using clangd as language server to hack on
RTS C sources:

- Ensure `-fPIC` is passed and `__PIC__` is defined, to be coherent
  with `-DDYNAMIC` and ensure the `__PIC__` guarded code paths are
  indexed
- Add the missing `-DRtsWay` definition, otherwise a few source files
  like `RtsUtils.c` and `Trace.c` would produce clangd errors

- - - - -
e36a5fcb by Matthew Pickering at 2025-12-05T16:25:57-05:00
Add support for building bytecode libraries

A bytecode library is a collection of bytecode files (.gbc) and a
library which combines together additional object files.

A bytecode library is created by invoking GHC with the `-bytecodelib`
flag.

A library can be created from in-memory `ModuleByteCode` linkables or
by passing `.gbc` files as arguments on the command line.

Fixes #26298

- - - - -
8f9ae339 by Matthew Pickering at 2025-12-05T16:25:57-05:00
Load bytecode libraries to satisfy package dependencies

This commit allows you to use a bytecode library to satisfy a package
dependency when using the interpreter.

If a user enables `-fprefer-byte-code`, then if a package provides a
bytecode library, that will be loaded and used to satisfy the
dependency.

The main change is to separate the relevant parts of the `LoaderState`
into external and home package byte code. Bytecode is loaded into either
the home package or external part (similar to HPT/EPS split), HPT
bytecode can be unloaded. External bytecode is never unloaded.

The unload function has also only been called with an empty list of
"stable linkables" for a long time. It has been modified to directly
implement a complete unloading of the home package bytecode linkables.

At the moment, the bytecode libraries are found in the "library-dirs"
field from the package description. In the future when `Cabal`
implements support for "bytecode-library-dirs" field, we can read the
bytecode libraries from there. No changes to the Cabal submodule are
necessary at the moment.

Four new tests are added in testsuite/tests/cabal, which generate fake
package descriptions and test loading the libraries into GHCi.

Fixes #26298

- - - - -
54458ce4 by mangoiv at 2025-12-05T16:26:50-05:00
ExplicitLevelImports: improve documentation of the code

- more explicit names for variable names like `flg` or `topLevel`
- don't pass the same value twice to functions
- some explanations of interesting but undocumented code paths
- adjust comment to not mention non-existent error message

- - - - -
c7061392 by mangoiv at 2025-12-05T16:27:42-05:00
driver: don't expect nodes to exist when checking paths between them

In `mgQueryZero`, previously node lookups were expected to never fail,
i.e. it was expected that when calculating the path between two nodes in
a zero level import graph, both nodes would always exist. This is not
the case, e.g. in some situations involving exact names (see the
test-case). The fix is to first check whether the node is present in the
graph at all, instead of panicking, just to report that there is no
path.

Closes #26568

- - - - -
d6cf8463 by Peng Fan at 2025-12-06T11:06:28-05:00
NCG/LA64: Simplify genCCall into two parts

genCCall is too long, so it's been simplified into two parts:
genPrim and genLibCCall.

Suggested by Andreas Klebinger

- - - - -
9d371d23 by Matthew Pickering at 2025-12-06T11:07:09-05:00
hadrian: Use a response file to invoke GHC for dep gathering.

In some cases we construct an argument list too long for GHC to
handle directly on windows. This happens when we generate
the dependency file because the command line will contain
references to a large number of .hs files.

To avoid this we now invoke GHC using a response file when
generating dependencies to sidestep length limitations.

Note that we only pass the actual file names in the dependency
file. Why? Because this side-steps #26560

- - - - -
0043bfb0 by Marc Scholten at 2025-12-06T11:08:03-05:00
update xhtml to 3000.4.0.0

haddock-api: bump xhtml bounds

haddock-api: use lazy text instead of string to support xhtml 3000.4.0.0

Bumping submodule xhtml to 3000.4.0.0

add xhtml to stage0Packages

remove unused import of writeUtf8File

Remove redundant import

Update haddock golden files for xhtml 3000.4.0.0

Metric Decrease:
    haddock.Cabal
    haddock.base

- - - - -
fc958fc9 by Julian Ospald at 2025-12-06T11:08:53-05:00
rts: Fix object file format detection in loadArchive

Commit 76d1041dfa4b96108cfdd22b07f2b3feb424dcbe seems to
have introduced this bug, ultimately leading to failure of
test T11788. I can only theorize that this test isn't run
in upstream's CI, because they don't build a static GHC.

The culprit is that we go through the thin archive, trying
to follow the members on the filesystem, but don't
re-identify the new object format of the member. This pins
`object_fmt` to `NotObject` from the thin archive.

Thanks to @angerman for spotting this.

- - - - -
0f297f6e by mangoiv at 2025-12-06T11:09:44-05:00
users' guide: don't use f strings in the python script to ensure compatibility with python 3.5

- - - - -
3bfe7aa2 by Matthew Pickering at 2025-12-07T12:18:57-05:00
ci: Try using multi repl in ghc-in-ghci test

This should be quite a bit faster than the ./hadrian/ghci command as it
doesn't properly build all the dependencies.

- - - - -
2ef1601a by Rodrigo Mesquita at 2025-12-07T12:19:38-05:00
Stack.Decode: Don't error on bitmap size 0

A RET_BCO may have a bitmap with no payload.
In that case, the bitmap = 0.

One can observe this by using -ddump-bcos and interpreting

```
main = pure ()
```

Observe, for instance, that the BCO for this main function has size 0:

```
ProtoBCO Main.main#0:
   \u []
       break<main:Main,0>() GHC.Internal.Base.pure
                                GHC.Internal.Base.$fApplicativeIO GHC.Internal.Tuple.()
   bitmap:  0 []
   BRK_FUN <breakarray> main:Main 0 <cc>
   PACK     () 0
   PUSH_G   GHC.Internal.Base.$fApplicativeIO
   PUSH_APPLY_PP
   PUSH_G   GHC.Internal.Base.pure
   ENTER
```

Perhaps we never tried to decode a stack in which a BCO like this was
present. However, for the debugger, we want to decode stacks of threads
stopped at breakpoints, and these kind of BCOs do get on a stack under
e.g. `stg_apply_interp_info` frames.

See the accompanying test in the next commit for an example to trigger
the bug this commit fixes.

Fixes #26640

- - - - -
747153d2 by Rodrigo Mesquita at 2025-12-07T12:19:38-05:00
Add test for #26640

- - - - -
d4b1e353 by Simon Hengel at 2025-12-10T00:00:02-05:00
Fix syntax error in gadt_syntax.rst
- - - - -
91cc8be6 by Cheng Shao at 2025-12-10T00:00:43-05:00
ci: fix "ci.sh clean" to address frequent out of space error on windows runners

This patch fixes the `ci.sh clean` logic to address frequent out of
space error on windows runners; previously it didn't clean up the
inplace mingw blobs, which is the largest source of space leak on
windows runners. See added comment for detailed explanation.

- - - - -
fe2b79f4 by Recursion Ninja at 2025-12-10T08:34:18-05:00
Narrow before optimising MUL/DIV/REM into shifts

The MUL/DIV/REM operations can be optimised into shifts when one of the
operands is a constant power of 2. However, as literals in Cmm are
stored as 'Integer', for this to be correct we first need to narrow the
literal to the appropriate width before checking whether the literal is
a power of 2.

Fixes #25664

- - - - -
06c2349c by Recursion Ninja at 2025-12-10T08:34:58-05:00
Decouple 'Language.Haskell.Syntax.Type' from 'GHC.Utils.Panic'

  - Remove the *original* defintion of 'hsQTvExplicit' defined within 'Language.Haskell.Syntax.Type'

  - Redefine 'hsQTvExplicit' as 'hsq_explicit' specialized to 'GhcPass' exported by 'GHC.Utils.Panic'

  - Define 'hsQTvExplicitBinders' as 'hsq_explicit' specialized to 'DocNameI' exported by 'Haddock.GhcUtils'.

  - Replace all call sites of the original 'hsQTvExplicit' definition with either:
    1. 'hsQTvExplicit' updated definition
    2. 'hsQTvExplicitBinders'

All call sites never entered the 'XLHsQTyVars' constructor branch, but a call to 'panic' existed on this code path because the type system was not strong enought to guarantee that the 'XLHsQTyVars' construction was impossible.
These two specialized functions provide the type system with enough information to make that guarantee, and hence the dependancy on 'panic' can be removed.

- - - - -
ac0815d5 by sheaf at 2025-12-10T23:39:57-05:00
Quantify arg before mult in function arrows

As noted in #23764, we expect quantification order to be left-to-right,
so that in a type such as

  a %m -> b

the inferred quantification order should be [a, m, b] and not [m, a, b].

This was addressed in commit d31fbf6c, but that commit failed to update
some other functions such as GHC.Core.TyCo.FVs.tyCoFVsOfType.

This affects Haddock, as whether we print an explicit forall or not
depends on whether the inferred quantification order matches the actual
quantification order.

- - - - -
2caf796e by sheaf at 2025-12-10T23:39:57-05:00
Haddock: improvements to ty-var quantification

This commit makes several improvements to how Haddock deals with the
quantification of type variables:

  1. In pattern synonyms, Haddock used to jumble up universal and
     existential quantification. That is now fixed, fixing #26252.

     Tested in the 'PatternSyns2' haddock-html test.

  2. The logic for computing whether to use an explicit kind annotation
     for a type variable quantified in a forall was not even wrong.
     This commit improves the heuristic, but it will always remain an
     imperfect heuristic (lest we actually run kind inference again).
     In the future (#26271), we hope to avoid reliance on this heuristic.

- - - - -
b14bdd59 by Teo Camarasu at 2025-12-10T23:40:38-05:00
Add explicit export list to GHC.Num

Let's make clear what this module exports to allow us to easily deprecate and remove some of these in the future. Resolves https://gitlab.haskell.org/ghc/ghc/-/issues/26625

- - - - -
d99f8326 by Cheng Shao at 2025-12-11T19:14:18-05:00
compiler: remove unused CPP code in foreign stub

This patch removes unused CPP code in the generated foreign stub:

- `#define IN_STG_CODE 0` is not needed, since `Rts.h` already
  includes this definition
- The `if defined(__cplusplus)` code paths are not needed in the `.c`
  file, since we don't generate C++ stubs and don't include C++
  headers in our stubs. But it still needs to be present in the `.h`
  header since it might be later included into C++ source files.

- - - - -
46c9746f by Cheng Shao at 2025-12-11T19:14:57-05:00
configure: bump LlvmMaxVersion to 22

This commit bumps LlvmMaxVersion to 22; 21.x releases have been
available since Aug 26th, 2025 and there's no regressions with 21.x so
far. This bump is also required for updating fedora image to 43.

- - - - -
96fce8d0 by Cheng Shao at 2025-12-12T01:17:51+01:00
hadrian: add support for building with UndefinedBehaviorSanitizer

This patch adds a +ubsan flavour transformer to hadrian to build all
stage1+ C/C++ code with UndefinedBehaviorSanitizer. This is
particularly useful to catch potential undefined behavior in the RTS
codebase.

- - - - -
f7a06d8c by Cheng Shao at 2025-12-12T01:17:51+01:00
ci: update alpine/fedora & add ubsan job

This patch updates alpine image to 3.23, fedora image to 43, and adds
a `x86_64-linux-fedora43-validate+debug_info+ubsan` job that's run in
validate/nightly pipelines to catch undefined behavior in the RTS
codebase.

- - - - -
2ccd11ca by Cheng Shao at 2025-12-12T01:17:51+01:00
rts: fix zero-length VLA undefined behavior in interpretBCO

This commit fixes a zero-length VLA undefined behavior in interpretBCO, caught by UBSan:

```
+rts/Interpreter.c:3133:19: runtime variable length array bound evaluates to non-positive value 0
```

- - - - -
4156ed19 by Cheng Shao at 2025-12-12T01:17:51+01:00
rts: fix unaligned ReadSpB in interpretBCO

This commit fixes unaligned ReadSpB in interpretBCO, caught by UBSan:

```
+rts/Interpreter.c:2174:64: runtime load of misaligned address 0x004202059dd1 for type 'StgWord', which requires 8 byte alignment
```

To perform proper unaligned read, we define StgUnalignedWord as a type
alias of StgWord with aligned(1) attribute, and load StgUnalignedWord
instead of StgWord in ReadSpB, so the C compiler is aware that we're
not loading with natural alignment.

- - - - -
fef89fb9 by Cheng Shao at 2025-12-12T01:17:51+01:00
rts: fix signed integer overflow in subword arithmetic in interpretBCO

This commit fixes signed integer overflow in subword arithmetic in
interpretBCO, see added note for detailed explanation.

- - - - -
3c001377 by Cheng Shao at 2025-12-13T05:03:15-05:00
ci: use treeless fetch for perf notes

This patch improves the ci logic for fetching perf notes by using
treeless fetch
(https://github.blog/open-source/git/get-up-to-speed-with-partial-clone-and-s...),
to avoid downloading all blobs of the perf notes repo at once, and
only fetch the actually required blobs on-demand when needed. This
makes the initial `test-metrics.sh pull` operation much faster, and
also more robust, since we are seeing an increasing rate of 504 errors
in CI when fetching all perf notes at once, which is a major source of
CI flakiness at this point.

Co-authored-by: Codex <codex@openai.com>

- - - - -
123a8d77 by Peter Trommler at 2025-12-13T05:03:57-05:00
Cmm: remove restriction in MachOp folding

- - - - -
0b54b5fd by Andreas Klebinger at 2025-12-13T05:04:38-05:00
Remove explicit Typeable deriviations.

- - - - -
08b13f7b by Cheng Shao at 2025-12-13T05:05:18-05:00
ci: set gc.auto=0 during setup stage

This patch sets `gc.auto=0` during `setup` stage of CI, see added
comment for detailed explanation.

- - - - -
3b5aecb5 by Ben Gamari at 2025-12-13T23:43:10+01:00
Bump exceptions submodule to 0.10.11

- - - - -
c32de3b0 by Johan Förberg at 2025-12-15T02:36:03-05:00
base: Define Semigroup and Monoid instances for lazy ST

CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/374

Fixes #26581

- - - - -
4f8b660c by mangoiv at 2025-12-15T02:37:05-05:00
ci: do not require nightly cabal-reinstall job to succeed

- - - - -
2c2a3ef3 by Cheng Shao at 2025-12-15T11:51:53-05:00
docs: drop obsolete warning about -fexternal-interpreter on windows

This patch drops an obsolete warning about -fexternal-interpreter not
supported on windows; it is supported since a long time ago, including
the profiled way.

- - - - -
68573aa5 by Marc Scholten at 2025-12-15T11:53:00-05:00
haddock: Drop Haddock.Backends.HaddockDB as it's unused

- - - - -
b230d549 by mangoiv at 2025-12-16T15:17:45-05:00
base: generalize delete{Firsts,}By

When we delete{Firsts,}By we should not require the
lists to be  the same type. This is an especially useful
generalisation in the case of deleteFirstsBy because we
can skip an invocation of the map function.

This change was discussed on the core-libraries-committee's bug
tracker at https://github.com/haskell/core-libraries-committee/issues/372.

- - - - -
6a2b43e3 by Cheng Shao at 2025-12-16T15:18:30-05:00
compiler: clean up redundant LANGUAGE pragmas

This patch bumps `default-language` of `ghc`/`ghc-bin` from `GHC2021`
to `GHC2024` (which is supported in ghc 9.10, current boot ghc lower
version bound), and also cleans up redundant `LANGUAGE` pragmas (as
well as `default-extensions`/`other-extensions`) that are already
implied by `GHC2024`.

Co-authored-by: Codex <codex@openai.com>

- - - - -
fca9cd7c by sheaf at 2025-12-18T13:18:18-05:00
X86 CodeGen: fix assign_eax_sse_regs

We must set %al to the number of SSE2 registers that contain arguments
(in case we are dealing with a varargs function). The logic for counting
how many arguments reside in SSE2 registers was incorrect, as it used
'isFloatFormat', which incorrectly ignores vector registers.

We now instead do case analysis on the register class:

  is_sse_reg r =
    case targetClassOfReg platform r of
      RcFloatOrVector -> True
      RcInteger       -> False

This change is necessary to prevent segfaults in T20030_test1j, because
subsequent commits change the format calculations, resulting in vector
formats more often.

- - - - -
53150617 by sheaf at 2025-12-18T13:18:19-05:00
X86 regUsageOfInstr: fix format for IMUL

When used with 8-bit operands, the IMUL instruction returns the result
in the lower 16 bits of %rax (also known as %ax). This is different
than for the other sizes, where an input at 16, 32 or 64 bits will
result in 16, 32 or 64 bits of output in both %rax and %rdx.

This doesn't affect the behaviour of the compiler, because we don't
allow partial writes at sub-word sizes. The rationale is explained
in Wrinkle [Don't allow scalar partial writes] in Note [Register formats in liveness analysis],
in GHC.CmmToAsm.Reg.Liveness.

- - - - -
c7a56dd1 by sheaf at 2025-12-18T13:18:19-05:00
Liveness analysis: consider register formats

This commit updates the register allocator to be a bit more careful in
situations in which a single register is used at multiple different
formats, e.g. when xmm1 is used both to store a Double# and a DoubleX2#.

This is done by introducing the 'Regs' newtype around 'UniqSet RegWithFormat',
for which the combining operations take the larger of the two formats
instead of overriding the format.

Operations on 'Regs' are defined in 'GHC.CmmToAsm.Reg.Regs'. There is
a modest compile-time cost for the additional overhead for tracking
register formats, which causes the metric increases of this commit.

The subtle aspects of the implementation are outlined in
Note [Register formats in liveness analysis] in GHC.CmmToAsm.Reg.Liveness.

Fixes #26411 #26611

-------------------------
Metric Increase:
    T12707
    T26425
    T3294
-------------------------

- - - - -
c2e83339 by sheaf at 2025-12-18T13:18:19-05:00
Register allocator: reload at same format as spill

This commit ensures that if we spill a register onto the stack at a
given format, we then always reload the register at this same format.

This ensures we don't end up in a situation where we spill F64x2 but end
up only reloading the lower F64. This first reload would make us believe
the whole data is in a register, thus silently losing the upper 64 bits
of the spilled register's contents.

Fixes #26526

- - - - -
55ab583b by sheaf at 2025-12-18T13:18:19-05:00
Register allocation: writes redefine format

As explained in Note [Allocated register formats] in GHC.CmmToAsm.Reg.Linear,
we consider all writes to redefine the format of the register.

This ensures that in a situation such as

  movsd .Ln6m(%rip),%v1
  shufpd $0,%v1,%v1

we properly consider the broadcast operation to change the format of %v1
from F64 to F64x2.

This completes the fix to #26411 (test in T26411b).

- - - - -
951402ed by Vladislav Zavialov at 2025-12-18T13:19:05-05:00
Parser: improve mkModuleImpExp, remove checkImportSpec

1. The `mkModuleImpExp` helper now knows whether it is processing an import or
   export list item, and uses this information to produce a more accurate error
   message for `import M (T(..,x))` with PatternSynonyms disabled.
   The old message incorrectly referred to this case as an export form.

2. The `checkImportSpec` helper is removed in favor of more comprehensive error
   checking in `mkModuleImpExp`.

3. Additionaly, the invariants of `ImpExpList` and `ImpExpAllWith` have been
   made more explicit in the comments and assertions (calls to 'panic').

Test case: import-syntax-no-ext

- - - - -
47d83d96 by Vladislav Zavialov at 2025-12-18T13:19:06-05:00
Subordinate namespace-specified wildcards (#25901)

Add support for subordinate namespace-specified wildcards
`X(type ..)` and `X(data ..)` to import and export lists.

Examples:
  import M (Cls(type ..))  -- imports Cls and all its associated types
  import M (Cls(data ..))  -- imports Cls and all its methods
  module M (R(data ..), C(type ..)) where
    -- exports R and all its data constructors and record fields;
    -- exports C and all its associated types, but not its methods

The scope of this change is limited to the case where the wildcard is the only
subordinate import/export item, whereas the more complex forms `X(type .., f)`
or `X(type .., data ..)` are unsupported and raise the newly introduced
PsErrUnsupportedExplicitNamespace error. This restriction may be lifted later.

Summary of the changes:

1. Refactor IEThingAll to store its extension field XIEThingAll as a record
   IEThingAllExt instead of a tuple.

2. Extend the AST by adding a NamespaceSpecifier field to IEThingAllExt,
   representing an optional namespace specifier `type` or `data` in front
   of a subordinate wildcard `X(..)`.

3. Extend the grammar in Parser.y with productions for `type ..` and `data ..`
   in subordinate import/export items.

4. Introduce `filterByNamespaceGREs` to filter [GlobalRdrElt] by a
   NamespaceSpecifier; use it in `filterImports` and `exports_from_avail`
   to account for the namespace specifier in IEThingAll.

5. Improve diagnostics by storing more information in DodgyImportsEmptyParent
   and DodgyExportsEmptyParent.

Test cases:
  T25901_sub_e   T25901_sub_f   T25901_sub_g   T25901_sub_a
  T25901_sub_b   T25901_sub_c   T25901_sub_d   T25901_sub_w
  DodgyImports02 DodgyImports03 DodgyImports04

- - - - -
eac418bb by Recursion Ninja at 2025-12-18T13:19:48-05:00
Removing the 'Data' instance for 'InstEnv'.

The 'Data' instance is blocking work on Trees that Grow, and the
'Data' instance seem to have been added without a clear purpose.

- - - - -
e920e038 by Recursion Ninja at 2025-12-18T13:19:48-05:00
'Decouple Language.Haskell.Syntax.Decls' from 'GHC.Unit.Module.Warnings'

- - - - -
bd38b76c by Cheng Shao at 2025-12-18T13:20:31-05:00
testsuite: improve coverage of foundation test

This patch refactors the `foundation` test a bit to improve coverage:

- Instead of using a hard-coded seed, a random seed is now taken from
  the command line, and printed upon test failure. This improves test
  coverage over many future CI runs, and shall a failure occur, the
  seed is available in the CI log for local reproduction.
- The iterations count is bumped to 1000 instead of 100, similar to
  the bump in `test-primops`. Runtime timeout is bumped 2x just to be
  safe.
- Improve `newLCGGen` by using non-atomic loads/stores on a
  `MutableByteArray#` for storing mutable `Word64`, this test doesn't
  use parallelism in the first place
- Fixed a few compiler warnings and removed redundant pragmas and
  imports

Co-authored-by: Codex <codex@openai.com>

- - - - -
3995187c by Sylvain Henry at 2025-12-18T13:21:45-05:00
Doc: document -pgmi "" (#26634)

- - - - -
5729418c by Cheng Shao at 2025-12-18T13:22:29-05:00
rts: use __builtin_mul_overflow for hs_mulIntMayOflo

This patch uses `__builtin_mul_overflow` to implement
`hs_mulIntMayOflo`. This is a GNU C checked arithmetic builtin
function supported by gcc/clang, is type-generic so works for both
32-bit/64-bit, and makes the code both more efficient and easier to
read/maintain than the previous hand rolled logic.

- - - - -
1ca4b49a by Cheng Shao at 2025-12-18T13:23:11-05:00
compiler/rts: fix ABI mismatch in barf() invocations

This patch fixes a long-standing issue of ABI mismatch in `barf()`
invocations, both in compiler-emitted code and in hand written Cmm
code:

- In RTS, we have `barf()` which reports a fatal internal error
  message and exits the program.
- `barf()` is a variadic C function! When used as a callee of a
  foreign call with `ccall` calling convention instead of `capi`,
  there is an ABI mismatch between the caller and the callee!
- Unfortunately, both the compiler and the Cmm sources contain many
  places where we call `barf()` via `ccall` convention!! Like, when
  you write `foreign "C" barf("foo object (%p) entered!", R1)`, it
  totally doesn't do what you think it'll do at all!! The second
  argument `R1` is not properly passed in `va_list`, and the behavior
  is completely undefined!!
- Even more unfortunately, this issue has been sitting around long
  enough because the ABI mismatch is subtle enough on normie platforms
  like x64 and arm64.
- But there are platforms like wasm32 that are stricter about ABI, and
  the broken `barf()` invocations already causes trouble for wasm
  backend: we had to use ugly hacks like `barf(errmsg, NULL)` to make
  `wasm-ld` happy, and even with this band-aid, compiler-generated
  `barf()` invocations are still broken, resulting in regressions in
  certain debug-related functionality, e.g. `-dtag-inference-checks`
  is broken on wasm32 (#22882).

This patch properly fixes the issue:

- We add non-variadic `barf` wrappers in the RTS that can be used as
  `ccall` callees
- Both the compiler `emitBarf` logic and the hand-written Cmm are
  changed to call these wrappers
- `emitBarf` now also properly annotates the foreign call as
  `CmmNeverReturns` to indicate it's a noreturn call to enable more
  efficient code generation

`-dtag-inference-checks` now works on wasm. Closes #22882.

Co-authored-by: Codex <codex@openai.com>

- - - - -
b3dd23b9 by Vilim Lendvaj at 2025-12-18T13:23:57-05:00
Remove outdated comment

The Traversable instance for ZipList is no longer in
GHC.Internal.Data.Traversable. In fact, it is right below this very comment.

- - - - -
9a9c2f03 by Cheng Shao at 2025-12-18T13:24:39-05:00
compiler: remove unused OtherSection logic

This patch removes the OtherSection logic in Cmm, given it's never
actually used by any of our backends.

- - - - -
91edd292 by Wolfgang Jeltsch at 2025-12-19T03:18:19-05:00
Remove unused known-key and name variables for generics

This removes the known-key and corresponding name variables for `K1`,
`M1`, `R`, `D`, `C`, `S`, and `URec` from `GHC.Generics`, as they are
apparently nowhere used in GHC’s source code.

- - - - -
73ee7e38 by Wolfgang Jeltsch at 2025-12-19T03:19:02-05:00
Remove unused known keys and names for generics classes

This removes the known-key and corresponding name variables for
`Datatype`, `Constructor`, and `Selector` from `GHC.Generics`, as they
are apparently nowhere used in GHC’s source code.

- - - - -
f69c5f14 by Cheng Shao at 2025-12-19T03:19:45-05:00
wasm: fix handling of ByteArray#/MutableByteArray# arguments in JSFFI imports

This patch fixes the handling of ByteArray#/MutableByteArray#
arguments in JSFFI imports, see the amended note and manual for
explanation. Also adds a test to witness the fix.

Co-authored-by: Codex <codex@openai.com>

- - - - -
224446a2 by Cheng Shao at 2025-12-20T07:49:54-05:00
rts: workaround -Werror=maybe-uninitialized false positives

In some cases gcc might report -Werror=maybe-uninitialized that we
know are false positives, but need to workaround it to make validate
builds with -Werror pass.

- - - - -
251ec087 by Cheng Shao at 2025-12-20T07:49:54-05:00
hadrian: use -Og as C/C++ optimization level when debugging

This commit enables -Og as optimization level when compiling the debug
ways of rts. According to gcc documentation
(https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-Og),
-Og is a better choice than -O0 for producing debuggable code. It's
also supported by clang as well, so it makes sense to use it as a
default for debugging. Also add missing -g3 flag to C++ compilation
flags in +debug_info flavour transformer.

- - - - -
fb586c67 by Cheng Shao at 2025-12-20T07:50:36-05:00
compiler: replace DList with OrdList

This patch removes `DList` logic from the compiler and replaces it
with `OrdList` which also supports O(1) concatenation and should be
more memory efficient than the church-encoded `DList`.

- - - - -
8149c987 by Cheng Shao at 2025-12-20T17:06:51-05:00
hadrian: add with_profiled_libs flavour transformer

This patch adds a `with_profiled_libs` flavour transformer to hadrian
which is the exact opposite of `no_profiled_libs`. It adds profiling
ways to stage1+ rts/library ways, and doesn't alter other flavour
settings. It is useful when needing to test profiling logic locally
with a quick flavour.

- - - - -
746b18cd by Cheng Shao at 2025-12-20T17:06:51-05:00
hadrian: fix missing profiled dynamic libraries in profiled_ghc

This commit fixes the profiled_ghc flavour transformer to include
profiled dynamic libraries as well, since they're supported by GHC
since !12595.

- - - - -
4dd7e3b9 by Cheng Shao at 2025-12-20T17:07:33-05:00
ci: set http.postBuffer to mitigate perf notes timeout on some runners

This patch sets http.postBuffer to mitigate the timeout when fetching
perf notes on some runners with slow internet connection. Fixes #26684.

- - - - -
bc36268a by Wolfgang Jeltsch at 2025-12-21T16:23:24-05:00
Remove unused known keys and names for type representations

This removes the known-key and corresponding name variables for
`TrName`, `TrNameD`, `TypeRep`, `KindRepTypeLitD`, `TypeLitSort`, and
`mkTrType`, as they are apparently nowhere used in GHC’s source code.

- - - - -
ff5050e9 by Wolfgang Jeltsch at 2025-12-21T16:24:04-05:00
Remove unused known keys and names for natural operations

This removes the known-key and corresponding name variables for
`naturalAndNot`, `naturalLog2`, `naturalLogBaseWord`, `naturalLogBase`,
`naturalPowMod`, `naturalSizeInBase`, `naturalToFloat`, and
`naturalToDouble`, as they are apparently nowhere used in GHC’s source
code.

- - - - -
424388c2 by Wolfgang Jeltsch at 2025-12-21T16:24:45-05:00
Remove the unused known key and name for `Fingerprint`

This removes the variables for the known key and the name of the
`Fingerprint` data constructor, as they are apparently nowhere used in
GHC’s source code.

- - - - -
a1ed86fe by Wolfgang Jeltsch at 2025-12-21T16:25:26-05:00
Remove the unused known key and name for `failIO`

This removes the variables for the known key and the name of the
`failIO` operation, as they are apparently nowhere used in GHC’s source
code.

- - - - -
b8220daf by Wolfgang Jeltsch at 2025-12-21T16:26:07-05:00
Remove the unused known key and name for `liftM`

This removes the variables for the known key and the name of the `liftM`
operation, as they are apparently nowhere used in GHC’s source code.

- - - - -
eb0628b1 by Wolfgang Jeltsch at 2025-12-21T16:26:47-05:00
Fix the documentation of `hIsClosed`

- - - - -
db1ce858 by sheaf at 2025-12-22T17:11:17-05:00
Do deep subsumption when computing valid hole fits

This commit makes a couple of improvements to the code that
computes "valid hole fits":

  1. It uses deep subsumption for data constructors.
     This matches up the multiplicities, as per
     Note [Typechecking data constructors].
     This fixes #26338 (test: LinearHoleFits).

  2. It now suggests (non-unidirectional) pattern synonyms as valid
     hole fits. This fixes #26339 (test: PatSynHoleFit).

  3. It uses 'stableNameCmp', to make the hole fit output deterministic.

-------------------------
Metric Increase:
    hard_hole_fits
-------------------------

- - - - -
72ee9100 by sheaf at 2025-12-22T17:11:17-05:00
Speed up hole fits with a quick pre-test

This speeds up the machinery for valid hole fits by doing a small
check to rule out obviously wrong hole fits, such as:

  1. A hole fit identifier whose type has a different TyCon at the head,
     after looking through foralls and (=>) arrows, e.g.:
        hole_ty = Int
        cand_ty = Maybe a
     or
        hole_ty = forall a b. a -> b
        cand_ty = forall x y. Either x y
  2. A hole fit identifier that is not polymorphic when the hole type
     is polymorphic, e.g.
       hole_ty = forall a. a -> a
       cand_ty = Int -> Int

-------------------------
Metric Decrease:
    hard_hole_fits
-------------------------

- - - - -
30e513ba by Cheng Shao at 2025-12-22T17:12:00-05:00
configure: remove unused win32-tarballs.md5sum

This patch removes the unused `win32-tarballs.md5sum` file from the
tree. The current mingw tarball download logic in
`mk/get-win32-tarballs.py` fetches and checks against `SHA256SUM` from
the same location where the tarballs are fetched, and this file has
been unused for a few years.

- - - - -
a2d52b3b by Wolfgang Jeltsch at 2025-12-23T04:47:33-05:00
Add an operation `System.IO.hGetNewlineMode`

This commit also contains some small code and documentation changes for
related operations, for the sake of consistency.

- - - - -
b26d134a by Cheng Shao at 2025-12-23T04:48:15-05:00
rts: opportunistically reclaim slop space in shrinkMutableByteArray#

Previously, `shrinkMutableByteArray#` shrinks a `MutableByteArray#`
in-place by assigning the new size to it, and zeroing the extra slop
space. That slop space is not reclaimed and wasted. But it's often the
case that we allocate a `MutableByteArray#` upfront, then shrink it
shortly after, so the `MutableByteArray#` closure sits right at the
end of a nursery block; this patch identifies such chances, and also
shrink `bd->free` if possible, reducing heap space fragmentation.

Co-authored-by: Codex <codex@openai.com>

-------------------------
Metric Decrease:
    T10678
-------------------------

- - - - -
c72ddabf by Cheng Shao at 2025-12-23T16:13:23-05:00
hadrian: fix bootstrapping with ghc-9.14

This patch fixes bootstrapping GHC with ghc-9.14, tested locally with
ghc-9.14.1 release as bootstrapping GHC.

- - - - -
0fd6d8e4 by Cheng Shao at 2025-12-23T16:14:05-05:00
hadrian: pass -keep-tmp-files to test ghc when --keep-test-files is enabled

This patch makes hadrian pass `-keep-tmp-files` to test ghc when
`--keep-test-files` is enabled, so you can check the ghc intermediate
files when debugging certain test failures. Closes #26688.

- - - - -
81d10134 by Cheng Shao at 2025-12-24T06:11:52-05:00
configure: remove dead code in configure scripts

This patch removes dead code in our configure scripts, including:

- Variables and auto-detected programs that are not used
- autoconf functions that are not used, or export a variable that's
  not used
- `AC_CHECK_HEADERS` invocations that don't have actual corresponding
  `HAVE_XXX_H` usage
- Other dead code (e.g. stray `AC_DEFUN()`)

Co-authored-by: Codex <codex@openai.com>

- - - - -
fb1381c3 by Wolfgang Jeltsch at 2025-12-24T06:12:34-05:00
Remove unused known keys and names for list operations

This removes the known-key and corresponding name variables for
`concat`, `filter`, `zip`, and `(++)`, as they are apparently nowhere
used in GHC’s source code.

- - - - -
7b9c20f4 by Recursion Ninja at 2025-12-24T10:35:36-05:00
Decoupling Language.Haskell.Syntax.Binds from GHC.Types.Basic
by transferring InlinePragma types between the modules.

  * Moved InlinePragma data-types to Language.Haskell.Syntax.Binds.InlinePragma

  * Partitioned of Arity type synonyms to GHC.Types.Arity

  * InlinePragma is now extensible via Trees That Grow

  * Activation is now extensible via Trees That Grow

  * Maybe Arity change to more descriptive InlineSaturation data-type

  * InlineSaturation information removed from InlinePragma during GHS parsing pass

  * Cleaned up the exposed module interfaces of the new modules

- - - - -
a3afae0c by Simon Peyton Jones at 2025-12-25T15:26:36-05:00
Check for rubbish literals in Lint

Addresses #26607.

See new Note [Checking for rubbish literals] in GHC.Core.Lint

- - - - -
8a317b6f by Aaron Allen at 2026-01-01T03:05:15-05:00
[#26183] Associated Type Iface Fix

When determining "extras" for class decl interface entries, axioms for
the associated types need to included so that dependent modules will be
recompiled if those axioms change.

resolves #26183

- - - - -
ae1aeaab by Cheng Shao at 2026-01-01T03:06:32-05:00
testsuite: run numeric tests with optasm when available

This patch adds the `optasm` extra way to nueric tests when NCG is
available. Some numeric bugs only surface with optimization, omitting
this can hide these bugs and even make them slip into release! (e.g. #26711)

- - - - -
6213bb57 by maralorn at 2026-01-02T16:30:32+01:00
GHC.Internal.Exception.Context: Fix comment

on addExceptionAnnotation
- - - - -
b820ff50 by Janis Voigtlaender at 2026-01-05T02:43:18-05:00
GHC.Internal.Control.Monad.replicateM: Fix comment

- - - - -
a8a94aad by Cheng Shao at 2026-01-05T16:24:04-05:00
hadrian: drops unused PE linker script for windows

This patch drops unused PE linker script for windows in the
`MergeObjects` builder of hadrian. The linker script is used for
merging object files into a single `HS*.o` object file and undoing the
effect of split sections, when building the "ghci library" object
file. However, we don't build the ghci library on windows, and this
code path is actually unreachable.

- - - - -
53038ea9 by Cheng Shao at 2026-01-05T16:24:04-05:00
hadrian: drop unused logic for building ghci libraries

This patch drops the unused logic for building ghci libraries in
hadrian:

- The term "ghci library" refers to an optional object file per
  library `HS*.o`, which is merged from multiple object files in that
  library using the `MergeObjects` builder in hadrian.
- The original rationale of having a ghci library object, in addition
  to normal archives, was to speedup ghci loading, since the combined
  object is linked with a linker script to undo the effects of
  `-fsplit-sections` to reduce section count and make it easier for
  the RTS linker to handle.
- However, most GHC builds enable `dynamicGhcPrograms` by default, in
  such cases the ghci library would already not be built.
- `dynamicGhcPrograms` is disabled on Windows, but still we don't
  build the ghci library due to lack of functioning merge objects
  command.
- The only case that we actually build ghci library objects, are
  alpine fully static bindists. However, for other reasons, split
  sections is already disabled for fully static builds anyway!
- There will not be any regression if the ghci library objects are
  absent from a GHC global libdir when `dynamicGhcPrograms` is
  disabled. The RTS linker can already load the archives without any
  issue.

Hence the removal. We now forcibly disable ghci libraries for all
Cabal components, and rip out all logic related to `MergeObjects` and
ghci libraries in hadrian. This also nicely cleans up some old todos
and fixmes that are no longer relevant.

Note that MergeObjects in hadrian is not the same thing as merge
objects in the GHC driver. The latter is not affected by this patch.

-------------------------
Metric Decrease:
    libdir
-------------------------

Co-authored-by: Codex <codex@openai.com>

- - - - -
8f209336 by Simon Jakobi at 2026-01-05T16:24:48-05:00
User's guide: Fix link to language extensions

Instead of linking to haddocks, it seemed more useful to link
to the extension overview in the user's guide.

Closes #26614.

- - - - -
0b7df6db by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Improved fundeps for closed type families

The big payload of this commit is to execute the plan suggested
in #23162, by improving the way that we generate functional
dependencies for closed type families.

It is all described in Note [Exploiting closed type families]

Most of the changes are in GHC.Tc.Solver.FunDeps

Other small changes

* GHC.Tc.Solver.bumpReductionDepth.  This function brings together the code that
   * Bumps the depth
   * Checks for overflow
  Previously the two were separated, sometimes quite widely.

* GHC.Core.Unify.niFixSubst: minor improvement, removing an unnecessary
  itraetion in the base case.

* GHC.Core.Unify: no need to pass an InScopeSet to
  tcUnifyTysForInjectivity. It can calculate one for itself; and it is
  never inspected anyway so it's free to do so.

* GHC.Tc.Errors.Ppr: slight impovement to the error message for
  reduction-stack overflow, when a constraint (rather than a type) is
  involved.

* GHC.Tc.Solver.Monad.wrapUnifier: small change to the API

- - - - -
fde8bd88 by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Add missing (KK4) to kick-out criteria

There was a missing case in kick-out that meant we could fail
to solve an eminently-solvable constraint.

See the new notes about (KK4)

- - - - -
00082844 by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Some small refactorings of error reporting in the typechecker

This is just a tidy-up commit.

* Add ei_insoluble to ErrorItem, to cache insolubility.
  Small tidy-up.

* Remove `is_ip` and `mkIPErr` from GHC.Tc.Errors; instead enhance mkDictErr
  to handle implicit parameters.  Small refactor.

- - - - -
fe4cb252 by Simon Peyton Jones at 2026-01-06T09:32:24-05:00
Improve recording of insolubility for fundeps

This commit addresses #22652, by recording when the fundeps for
a constraint are definitely insoluble.  That in turn improves the
perspicacity of the pattern-match overlap checker.

See Note [Insoluble fundeps]

- - - - -
df0ffaa5 by Simon Peyton Jones at 2026-01-06T09:32:24-05:00
Fix a buglet in niFixSubst

The MR of which this is part failed an assertion check extendTvSubst
because we extended the TvSubst with a CoVar.  Boo.

This tiny patch fixes it, and adds the regression test from #13882
that showed it up.

- - - - -
3d6aba77 by konsumlamm at 2026-01-06T09:33:16-05:00
Fix changelog formatting
- - - - -
69e0ab59 by Cheng Shao at 2026-01-06T19:37:56-05:00
compiler: add targetHasRTSWays function

This commit adds a `targetHasRTSWays` util function in
`GHC.Driver.Session` to query if the target RTS has a given Ways (e.g.
WayThreaded).

- - - - -
25a0ab94 by Cheng Shao at 2026-01-06T19:37:56-05:00
compiler: link on-demand external interpreter with threaded RTS

This commit makes the compiler link the on-demand external interpreter
program with threaded RTS if it is available in the target RTS ways.
This is a better default than the previous single-threaded RTS, and it
enables the external interpreter to benefit from parallelism when
deserializing CreateBCOs messages.

- - - - -
92404a2b by Cheng Shao at 2026-01-06T19:37:56-05:00
hadrian: link iserv with threaded RTS

This commit makes hadrian link iserv with threaded RTS if it's
available in the RTS ways. Also cleans up the iserv main C program
which can be replaced by the `-fkeep-cafs` link-time option.

- - - - -
a20542d2 by Cheng Shao at 2026-01-06T19:38:38-05:00
ghc-internal: remove unused GMP macros

This patch removes unused GMP related macros from `ghc-internal`. The
in-tree GMP version was hard coded and outdated, but it was not used
anywhere anyway.

- - - - -
4079dcd6 by Cheng Shao at 2026-01-06T19:38:38-05:00
hadrian: fix in-tree gmp configure error on newer c compilers

Building in-tree gmp on newer c compilers that default to c23 fails at
configure stage, this patch fixes it, see added comment for
explanation.

- - - - -
414d1fe1 by Cheng Shao at 2026-01-06T19:39:20-05:00
compiler: fix LLVM backend pdep/pext handling for i386 target

This patch fixes LLVM backend's pdep/pext handling for i386 target,
and also removes non-existent 128/256/512 bit hs_pdep/hs_pext callees.
See amended note for more explanation. Fixes #26450.

Co-authored-by: Codex <codex@openai.com>

- - - - -
c7f6fba3 by Cheng Shao at 2026-01-06T19:39:20-05:00
ci: remove allow_failure flag for i386 alpine job

The LLVM codegen issue for i386 has been fixed, and the i386 alpine
job should pass now. This commit removes the allow_failure flag so
that other i386 regressions in the future are signaled more timely.

- - - - -
52d00c05 by Simon Peyton Jones at 2026-01-07T10:24:21-05:00
Add missing InVar->OutVar lookup in SetLevels

As #26681 showed, the SetLevels pass was failing to map an InVar to
an OutVar.  Very silly!  I'm amazed it hasn't broken before now.

I have improved the type singatures (to mention InVar and OutVar)
so it's more obvious what needs to happen.

- - - - -
ab0a5594 by Cheng Shao at 2026-01-07T10:25:04-05:00
hadrian: drop deprecated pkgHashSplitObjs code path

This patch drops deprecated `pkgHashSplitObjs` code path from hadrian,
since GHC itself has removed split objs support many versions ago and
this code path is unused.

- - - - -
bb3a2ba1 by Cheng Shao at 2026-01-07T10:25:44-05:00
hadrian: remove linting/assertion in quick-validate flavour

The `quick-validate` flavour is meant for testing ghc and passing the
testsuite locally with similar settings to `validate` but faster. This
patch removes the linting/assertion overhead in `quick-validate` to
improve developer experience. I also took the chance to simplify
redundant logic of rts/library way definition in `validate` flavour.

- - - - -
7971f5dd by Cheng Shao at 2026-01-07T10:26:26-05:00
deriveConstants: clean up unused constants

This patch cleans up unused constants from `deriveConstants`, they are
not used by C/Cmm code in the RTS, nor compiler-generated code.

Co-authored-by: Codex <codex@openai.com>

- - - - -
4df96993 by Cheng Shao at 2026-01-07T10:27:08-05:00
hadrian: pass -fno-omit-frame-pointer with +debug_info

This patch adds `-fno-omit-frame-pointer` as C/C++ compilation flag
when compiling with `+debug_info` flavour transformer. It's a sane
default when you care about debugging and reliable backtraces, and
makes debugging/profiling with bpf easier.

- - - - -
8a3900a3 by Aaron Allen at 2026-01-07T10:27:57-05:00
[26705] Include TyCl instances in data fam iface entry

Ensures dependent modules are recompiled when the class instances for a
data family instance change.

resolves #26705

- - - - -
a0b980af by Cheng Shao at 2026-01-07T10:28:38-05:00
hadrian: remove unused Hp2Ps/Hpc builders

This patch removes the Hp2Ps/Hpc builders from hadrian, they are
unused in the build system. Note that the hp2ps/hpc programs are still
built and not affected.

- - - - -
50a58757 by Cheng Shao at 2026-01-07T10:29:20-05:00
hadrian: only install js files to libdir for wasm/js targets

There are certain js files required for wasm/js targets to work, and
previously hadrian would install those js files to libdir
unconditionally on other targets as well. This could be a minor
annoyance for packagers especially when the unused js files contain
shebangs that interfere with the packaging process. This patch makes
hadrian only selectively install the right js files for the right
targets.

Co-authored-by: Codex <codex@openai.com>

- - - - -
da40e553 by Simon Peyton Jones at 2026-01-07T10:30:00-05:00
Add flavour transformer assertions_stage1

This allows us to enable -DDEBUG assertions in the stage1 compiler

- - - - -
ec3cf767 by Cheng Shao at 2026-01-08T06:24:31-05:00
make: remove unused Makefiles from legacy make build system

This patch removes unused Makefiles from legacy make build system; now
they are never used by hadrian in any way, and they already include
common boilerplate mk files that are long gone in the make build
system removal, hence the housecleaning.

Co-authored-by: Codex <codex@openai.com>

- - - - -
04ea3f83 by Cheng Shao at 2026-01-08T06:25:13-05:00
compiler: use -O3 as LLVM optimization level for ghc -O2

The GHC driver clamps LLVM optimization level to `-O2` due to LLVM
crashes, but those were historical issues many years ago that are no
longer relevant for LLVM versions we support today. This patch changes
the driver to use `-O3` as LLVM optimization level when compiling with
`-O2`, which is a better default when we're willing to trade
compilation time for faster generated code.

- - - - -
472df471 by Peter Trommler at 2026-01-08T13:28:54-05:00
Use half-word literals in info tables

With this commit info tables are mapped to the same assembler code
on big-endian and little-endian platforms.

Fixes #26579.

- - - - -
393f9c51 by Simon Peyton Jones at 2026-01-08T13:29:35-05:00
Refactor srutOkForBinderSwap

This MR does a small refactor:

* Moves `scrutOkForBinderSwap` and `BinderSwapDecision`
  to GHC.Core.Utils

* Inverts the sense of the coercion it returns, which makes
  more sense

No effect on behaviour

- - - - -
ad76fb0f by Simon Peyton Jones at 2026-01-08T13:29:36-05:00
Improve case merging

This small MR makes case merging happen a bit more often than
it otherwise could, by getting join points out of the way.

See #26709 and GHC.Core.Utils
  Note [Floating join points out of DEFAULT alternatives]

- - - - -
4c9395f5 by Cheng Shao at 2026-01-08T13:30:16-05:00
hadrian: remove broken hsc2hs flag when cross compiling to windows

This patch removes the `--via-asm` hsc2hs flag when cross compiling to
windows. With recent llvm-mingw toolchain, it would fail with:

```
x86_64-w64-mingw32-hsc2hs: Cannot combine instructions: [Quad 8,Long 4,Long 241,Ref ".Ltmp1-.Ltmp0"]
```

The hsc2hs default `--cross-compile` logic is slower but works.

- - - - -
71fdef55 by Simon Peyton Jones at 2026-01-08T13:30:57-05:00
Try harder to keep the substitution empty

Avoid unnecessary cloning of variables in the Simplifier.

Addresses #26724,

See Note [Keeping the substitution empty]

We get some big wins in compile time

Metrics: compile_time/bytes allocated
-------------------------------------
                                         Baseline
                    Test    Metric          value      New value Change
----------------------------------------------------------------------------
CoOpt_Singletons(normal) ghc/alloc    721,544,088    692,174,216  -4.1% GOOD
     LargeRecord(normal) ghc/alloc  1,268,031,157  1,265,168,448  -0.2%
          T14766(normal) ghc/alloc    918,218,533    688,432,296 -25.0% GOOD
          T15703(normal) ghc/alloc    318,103,629    306,638,016  -3.6% GOOD
          T17836(normal) ghc/alloc    419,174,584    418,400,824  -0.2%
          T18478(normal) ghc/alloc    471,042,976    470,261,376  -0.2%
          T20261(normal) ghc/alloc    573,387,162    563,663,336  -1.7%
          T24984(normal) ghc/alloc     87,832,666     87,636,168  -0.2%
          T25196(optasm) ghc/alloc  1,103,284,040  1,101,376,992  -0.2%
  hard_hole_fits(normal) ghc/alloc    224,981,413    224,608,208  -0.2%

               geo. mean                                          -0.3%
               minimum                                           -25.0%
               maximum                                            +0.1%

Metric Decrease:
    CoOpt_Singletons
    T14766
    T15703

- - - - -
30341168 by Simon Peyton Jones at 2026-01-08T13:31:38-05:00
Add regression test for #24867

- - - - -
1ac1a541 by Julian Ospald at 2026-01-09T02:48:53-05:00
Support statically linking executables properly

Fixes #26434

In detail, this does a number of things:
* Makes GHC aware of 'extra-libraries-static' (this changes the package
  database format).
* Adds a switch '-static-external' that will honour 'extra-libraries-static'
  to link external system dependencies statically.
* Adds a new field to settings/targets: "ld supports verbatim namespace".
  This field is used by '-static-external' to conditionally use '-l:foo.a'
  syntax during linking, which is more robust than trying to find the
  absolute path to an archive on our own.
* Adds a switch '-fully-static' that is meant as a high-level interface
  for e.g. cabal. This also honours 'extra-libraries-static'.

This also attempts to clean up the confusion around library search directories.
At the moment, we have 3 types of directories in the package database
format:
* library-dirs
* library-dirs-static
* dynamic-library-dirs

However, we only have two types of linking: dynamic or static. Given the
existing logic in 'mungeDynLibFields', this patch assumes that
'library-dirs' is really just nothing but a fallback and always
prefers the more specific variants if they exist and are non-empty.

Conceptually, we should be ok with even just one search dirs variant.
Haskell libraries are named differently depending on whether they're
static or dynamic, so GHC can conveniently pick the right one depending
on the linking needs. That means we don't really need to play tricks
with search paths to convince the compiler to do linking as we want it.
For system C libraries, the convention has been anyway to place static and
dynamic libs next to each other, so we need to deal with that issue
anyway and it is outside of our control. But this is out of the scope
of this patch.

This patch is backwards compatible with cabal. Cabal should however
be patched to use the new '-fully-static' switch.

- - - - -
ad3c808d by Julian Ospald at 2026-01-09T02:48:53-05:00
Warn when "-dynamic" is mixed with "-staticlib"

- - - - -
322dd672 by Matthew Pickering at 2026-01-09T02:49:35-05:00
rts: Use INFO_TABLE_CONSTR for stg_dummy_ret_closure

Since the closure type is CONSTR_NOCAF, we need to use INFO_TABLE_CONSTR
to populate the constructor description field (this crashes ghc-debug
when decoding AP_STACK frames sometimes)

Fixes #26745

- - - - -
039bac4c by Ben Gamari at 2026-01-09T20:22:16-05:00
ghc-internal: Move STM utilities out of GHC.Internal.Conc.Sync

This is necessary to avoid an import cycle on Windows when importing
`GHC.Internal.Exception.Context` in `GHC.Internal.Conc.Sync`.

On the road to address #25365.

- - - - -
8c389e8c by Ben Gamari at 2026-01-09T20:22:16-05:00
base: Capture backtrace from throwSTM

Implements core-libraries-committee#297.

Fixes #25365.

- - - - -
e1ce1fc3 by Ben Gamari at 2026-01-09T20:22:16-05:00
base: Annotate rethrown exceptions in catchSTM with WhileHandling

Implements core-libraries-committee#298

- - - - -
c4ebdbdf by Cheng Shao at 2026-01-09T20:23:06-05:00
compiler: make getPrim eagerly evaluate its result

This commit makes `GHC.Utils.Binary.getPrim` eagerly evaluate its
result, to avoid accidental laziness when future patches build other
binary parsers using `getPrim`.

- - - - -
66a0c4f7 by Cheng Shao at 2026-01-09T20:23:06-05:00
compiler: implement fast get/put for Word16/Word32/Word64

Previously, `GHC.Utils.Binary` contains `get`/`put` functions for
`Word16`/`Word32`/`Word64` which always loads and stores them as
big-endian words at a potentially unaligned address. The previous
implementation is based on loads/stores of individual bytes and
concatenating bytes with bitwise operations, which currently cannot be
fused to a single load/store operation by GHC.

This patch implements fast `get`/`put` functions for
`Word16`/`Word32`/`Word64` based on a single memory load/store, with
an additional `byteSwap` operation on little-endian hosts. It is based
on unaligned load/store primops added since GHC 9.10, and we already
require booting with at least 9.10, so it's about time to switch to
this faster path.

- - - - -
641ec3f0 by Simon Peyton Jones at 2026-01-09T20:23:55-05:00
Fix scoping errors in specialisation

Using -fspecialise-aggressively in #26682 showed up a couple of
subtle errors in the type-class specialiser.

* dumpBindUDs failed to call `deleteCallsMentioning`, resulting in a
  call that mentioned a dictionary that was not in scope.  This call
  has been missing since 2009!
    commit c43c981705ec33da92a9ce91eb90f2ecf00be9fe
    Author: Simon Peyton Jones <simonpj@microsoft.com>
    Date:   Fri Oct 23 16:15:51 2009 +0000

  Fixed by re-combining `dumpBindUDs` and `dumpUDs`.

* I think there was another bug involving the quantified type
  variables in polymorphic specialisation. In any case I refactored
  `specHeader` and `spec_call` so that the former looks for the
  extra quantified type variables rather than the latter.  This
  is quite a worthwhile simplification: less code, easier to grok.

Test case in simplCore/should_compile/T26682,
brilliantly minimised by @sheaf.

- - - - -
2433e91d by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: change sectionProtection to take SectionType argument

This commit changes `sectionProtection` to only take `SectionType`
argument instead of whole `Section`, since it doesn't need the Cmm
section content anyway, and it can then be called in parts of NCG
where we only have a `SectionType` in scope.

- - - - -
e5926fbe by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: change isInitOrFiniSection to take SectionType argument

This commit changes `isInitOrFiniSection` to only take `SectionType`
argument instead of whole `Section`, since it doesn't need the Cmm
section content anyway, and it can then be called in parts of NCG
where we only have a `SectionType` in scope. Also marks it as
exported.

- - - - -
244d57d7 by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: fix split sections on windows

This patch fixes split sections on windows by emitting the right
COMDAT section header in NCG, see added comment for more explanation.
Fix #26696 #26494.

-------------------------
Metric Decrease:
    LargeRecord
    T9675
    size_hello_artifact
    size_hello_artifact_gzip
    size_hello_unicode
    size_hello_unicode_gzip
Metric Increase:
    T13035
-------------------------

Co-authored-by: Codex <codex@openai.com>

- - - - -
182f3d0f by Cheng Shao at 2026-01-09T20:25:28-05:00
iserv: add comment about -fkeep-cafs

- - - - -
49675b69 by Matthew Craven at 2026-01-09T20:26:14-05:00
Account for "stupid theta" in demand sig for DataCon wrappers

Fixes #26748.

- - - - -
f3c18890 by Samuel Thibault at 2026-01-10T15:48:22+01:00
hurd: Fix getExecutablePath build

3939a8bf93e27 ("GNU/Hurd: Add getExecutablePath support") added using
/proc/self/exe for GNU/Hurd but missed adding the required imports for
the corresponding code.

- - - - -
7f15bd15 by Samuel Thibault at 2026-01-12T07:16:25-05:00
Fix the OS string encoding for GNU/Hurd

Following https://github.com/haskell/cabal/pull/9434/files , and as seen
in the various gnu_HOST_OS usages in the source code, it is expected that
GNU/Hurd is advertised as "gnu", like the autotools do.

- - - - -
1db2f240 by Andrew Lelechenko at 2026-01-12T07:17:06-05:00
Add since annotation for Data.Bifoldable1

Fixes #26432

- - - - -
e038a383 by Sven Tennie at 2026-01-12T07:17:49-05:00
Ignore Windows CI tool directories in Git

Otherwise, we see thousands of changes in `git status` which is very
confusing to work with.

- - - - -
023c301c by sheaf at 2026-01-13T04:57:30-05:00
Don't re-use stack slots for growing registers

This commit avoids re-using a stack slot for a register that has grown
but already had a stack slot.

For example, suppose we have stack slot assigments

  %v1 :: FF64 |-> StackSlot 0
  %v2 :: FF64 |-> StackSlot 1

Later, we start using %v1 at a larger format (e.g. F64x2) and we need
to spill it again. Then we **must not** use StackSlot 0, as a spill
at format F64x2 would clobber the data in StackSlot 1.

This can cause some fragmentation of the `StackMap`, but that's probably
OK.

Fixes #26668

- - - - -
d0966e64 by fendor at 2026-01-13T04:58:11-05:00
Remove `traceId` from ghc-pkg executable

- - - - -
20d7efec by Simon Peyton Jones at 2026-01-13T12:41:22-05:00
Make SpecContr rules fire a bit later

See #26615 and Note [SpecConstr rule activation]

- - - - -
8bc4eb8c by Andrew Lelechenko at 2026-01-13T12:42:03-05:00
Upgrade mtl submodule to 2.3.2

Fixes #26656

- - - - -
c94aaacd by Cheng Shao at 2026-01-13T12:42:44-05:00
compiler: remove iserv and only use on-demand external interpreter

This patch removes `iserv` from the tree completely. Hadrian would no
longer build or distribute `iserv`, and the GHC driver would use the
on-demand external interpreter by default when invoked with
`-fexternal-interpreter`, without needing to specify `-pgmi ""`. This
has multiple benefits:

- It allows cleanup of a lot of legacy hacks in the hadrian codebase.
- It paves the way for running cross ghc's iserv via cross emulator
  (#25523), fixing TH/ghci support for cross targets other than
  wasm/js.

- - - - -
c1fe0097 by Peter Trommler at 2026-01-14T03:54:49-05:00
PPC NCG: Fix shift right MO code

The shift amount in shift right [arithmetic] MOs is machine word
width. Therefore remove unnecessary zero- or sign-extending of
shift amount.

It looks harmless to extend the shift amount argument because the
shift right instruction uses only the seven lowest bits (i. e. mod 128).
But now we have a conversion operation from a smaller type to word width
around a memory load at word width. The types are not matching up but
there is no check done in CodeGen. The necessary conversion from word
width down to the smaller width would be translated into a no-op on
PowerPC anyway. So all seems harmless if it was not for a small
optimisation in getRegister'.

In getRegister' a load instruction with the smaller width of the
conversion operation was generated. This loaded the most significant
bits of the word in memory on a big-endian platform. These bits were
zero and hence shift right was used with shift amount zero and not one
as required in test Sized.

Fixes #26519

- - - - -
2dafc65a by Cheng Shao at 2026-01-14T03:55:31-05:00
Tree-wide cleanup of cygwin logic

GHC has not supported cygwin for quite a few years already, and will
not resume support in the forseeable future. The only supported
windows toolchain is clang64/clangarm64 of the msys2 project. This
patch cleans up the unused cygwin logic in the tree.

Co-authored-by: Codex <codex@openai.com>

- - - - -
66b96e2a by Teo Camarasu at 2026-01-14T03:56:13-05:00
Set default eventlog-flush-interval to 5s

Resolves #26707

- - - - -
d0254579 by Andrew Lelechenko at 2026-01-14T03:56:53-05:00
Document when -maxN RTS option was added

- - - - -
f25e2b12 by Cheng Shao at 2026-01-14T11:10:39-05:00
testsuite: remove obsolete --ci option from the testsuite driver

This patch removes the obsolete `--ci` option from the testsuite
driver: neither the CI scripts nor hadrian ever invokes the testsuite
driver with `--ci`, and the perf notes are always fetched to the
`refs/notes/perf` local reference anyway.

- - - - -
7964763b by Julian Ospald at 2026-01-14T11:11:31-05:00
Fix fetch_cabal

* download cabal if the existing one is of an older version
* fix FreeBSD download url
* fix unpacking on FreeBSD

- - - - -
6b0129c1 by Julian Ospald at 2026-01-14T11:11:31-05:00
Bump toolchain in CI

- - - - -
0f53ccc6 by Julian Ospald at 2026-01-14T11:11:31-05:00
Use libffi-clib

Previously, we would build libffi via hadrian
and bundle it manually with the GHC bindist.

This now moves all that logic out of hadrian
and allows us to have a clean Haskell package
to build and link against and ship it without
extra logic.

This patch still retains the ability to link
against a system libffi.

The main reason of bundling libffi was that on
some platforms (e.g. FreeBSD and Mac), system libffi
is not visible to the C toolchain by default,
so users would require settings in e.g. cabal
to be able to compile anything.

This adds the submodule libffi-clib to the repository.

- - - - -
5e1cd595 by Peng Fan at 2026-01-14T11:12:26-05:00
NCG/LA64: add support for la664 micro architecture

Add '-mla664' flag to LA664, which has some new features:
atomic instructions, dbar hints, etc.

'LA464' is the default so that unrecognized instructions are not
generated.

- - - - -
c56567ec by Simon Peyton Jones at 2026-01-15T23:19:04+00:00
Add evals for strict data-con args in worker-functions

This fixes #26722, by adding an eval in a worker for
arguments of strict data constructors, even if the
function body uses them strictly.

See (WIS1) in Note [Which Ids should be strictified]

I took the opportunity to make substantial improvements in the
documentation for call-by-value functions.  See especially
   Note [CBV Function Ids: overview] in GHC.Types.Id.Info
   Note [Which Ids should be CBV candidates?] ditto
   Note [EPT enforcement] in GHC.Stg.EnforceEpt
among others.

- - - - -
9719ce5d by Simon Peyton Jones at 2026-01-15T23:19:04+00:00
Improve `interestingArg`

This function analyses a function's argument to see if it is
interesting enough to deserve an inlining discount. Improvements
for
  * LitRubbish arguments
  * exprIsExpandable arguments

See Note [Interesting arguments] which is substantially rewritten.

- - - - -
7b616b9f by Cheng Shao at 2026-01-16T06:45:00-05:00
compiler: fix regression when compiling foreign stubs in the rts unit

This patch fixes a regression when compiling foreign stubs in the rts
unit introduced in 05e25647f72bc102061af3f20478aa72bff6ff6e. A simple
revert would fix it, but it's better to implement a proper fix with
comment for better understanding of the underlying problem, see the
added comment for explanation.

Co-authored-by: Codex <codex@openai.com>

- - - - -
c343ef64 by Sylvain Henry at 2026-01-16T06:45:51-05:00
base: remove GHC.JS.Prim.Internal.Build (#23432)

See accepted CLC proposal https://github.com/haskell/core-libraries-committee/issues/329

- - - - -
29c0aceb by Simon Peyton Jones at 2026-01-16T17:18:11-05:00
Improve newtype unwrapping

Ticket #26746 describes several relatively-minor shortcomings of newtype
unwrapping.  This MR addresses them, while also (arguably) simplifying
the code a bit.

See new Note [Solving newtype equalities: overview]
and     Note [Decomposing newtype equalities]
and     Note [Eager newtype decomposition]
and     Note [Even more eager newtype decomposition]

For some reason, on Windows only, runtime allocations decrease for test
T5205 (from 52k to 48k).  I have not idea why. No change at all on Linux.
I'm just going to accept the change.  (I saw this same effect in another
MR so I think it's a fault in the baseline.)

Metric Decrease:
    T5205

- - - - -
8b59e62c by Andreas Klebinger at 2026-01-16T17:18:52-05:00
testsuite: Widen acceptance window for T5205.

Fixes #26782

- - - - -
9e5e0234 by mangoiv at 2026-01-17T06:03:03-05:00
add a new issue template for getting verified

To reduce spam created by new users, we will in future not grant
any rights but reporting issues to new users. That is why we will
have to be able to verify them. The added issue template serves that
purpose.

- - - - -
b18b2c42 by Cheng Shao at 2026-01-17T06:03:44-05:00
llvm: fix split sections for llvm backend

This patch fixes split sections for llvm backend:

- Pass missing `--data-sections`/`--function-sections` flags to
  llc/opt.
- Use `@llvm.compiler.used` instead of `@llvm.used` to avoid sections
  being unnecessarily retained at link-time.

Fixes #26770.

-------------------------
Metric Decrease:
    libdir
    size_hello_artifact
    size_hello_unicode
-------------------------

Co-authored-by: Codex <codex@openai.com>

- - - - -
ebf66f67 by Cheng Shao at 2026-01-17T13:16:50-05:00
Update autoconf scripts

Scripts taken from autoconf a2287c3041a3f2a204eb942e09c015eab00dc7dd

- - - - -
598624b9 by Andreas Klebinger at 2026-01-17T13:17:32-05:00
CString.hs: Update incorrect comment.

Fixes #26322

- - - - -
eea2036b by Cheng Shao at 2026-01-18T10:00:49-05:00
libraries: bump haskeline submodule to 0.8.4.1

This patch bumps the haskeline submodule to 0.8.4.1 which includes an
important fix for an ANSI handling bug on Windows
(https://github.com/haskell/haskeline/pull/126).

- - - - -
87d8f6c2 by Cheng Shao at 2026-01-18T10:01:30-05:00
hadrian: replace default -H32m/-H64m with -O64M to improve mutator productivity

Most hadrian build flavours pass `-H32m`/`-H64m` to GHC as
conventional wisdom to improve mutator productivity and reduce GC
overhead. They were inherited from the legacy Make build system, and
there used to be make flags to instrument a build process with
`-Rghc-timing` option to collect GC stats of each GHC run from stderr.

It's time to revisit whether there are better defaults for
`-H32m`/`-H64m`, and this patch changes it to `-O64M` which indeed
improves mutator productivity based on real statistics. `-O64M` is
more aggressive than `-H64m`; it allows the old generation to grow to
at least 64M before triggering major GC and reduces major GC runs.

The stats of a clean build with `validate` flavour and `-H64m`:

```
h64m.log
  matched RTS stat lines: 5499
  sum MUT cpu     : 2400.808 s
  sum GC cpu      : 1378.292 s
  sum MUT elapsed : 2788.253 s
  sum GC elapsed  : 1389.233 s
  GC/MUT cpu ratio     : 0.574 (GC is 57.4% of MUT)
  GC/MUT elapsed ratio : 0.498 (GC is 49.8% of MUT)
  GC fraction of (MUT+GC) cpu     : 36.5%
  GC fraction of (MUT+GC) elapsed : 33.3%
  per-line GC/MUT cpu ratio: median 0.691, p90 1.777
  per-line GC/MUT elapsed ratio: median 0.519, p90 1.081
```

The stats of a clean build with `validate` flavour and `-O64M`:

```
o64m.log
  matched RTS stat lines: 5499
  sum MUT cpu     : 2377.383 s
  sum GC cpu      : 1127.146 s
  sum MUT elapsed : 2758.857 s
  sum GC elapsed  : 1135.587 s
  GC/MUT cpu ratio     : 0.474 (GC is 47.4% of MUT)
  GC/MUT elapsed ratio : 0.412 (GC is 41.2% of MUT)
  GC fraction of (MUT+GC) cpu     : 32.2%
  GC fraction of (MUT+GC) elapsed : 29.2%
  per-line GC/MUT cpu ratio: median 0.489, p90 1.099
  per-line GC/MUT elapsed ratio: median 0.367, p90 0.806
```

Mutator time is roughly in the same ballpark, but GC CPU time has
reduced by 18.22%, and mutator productivity has increased from 63.5%
to 67.8%.

- - - - -
8372e13d by Cheng Shao at 2026-01-18T10:02:12-05:00
rts: remove unused .def files from rts/win32

This patch removes unused .def files from `rts/win32`, given we don't
build .dll files for rts/ghc-internal/ghc-prim at all. Even when we
resurrect win32 dll support at some point in the future, these .def
files still contain incorrect symbols anyway and won't be of any use.

- - - - -
f6af485d by Cheng Shao at 2026-01-18T10:03:19-05:00
.gitmodules: use gitlab mirror for the libffi-clib submodule

This patch fixes .gitmodules to use the gitlab mirror for the
libffi-clib submodule, to make it coherent with other submodules that
allow ghc developers to experiment with wip branches in submodules for
ghc patches. Fixes #26783.

- - - - -
41432d25 by Cheng Shao at 2026-01-18T10:05:13-05:00
hadrian: remove the horrible i386 speedHack

When hadrian builds certain rts objects for i386, there's a horrible
speedHack that forces -fno-PIC even for dynamic ways of those objects.
This is not compatible with newer versions of gcc/binutils as well as
clang/lld, and this patch removes it. Fixes #26792.

- - - - -
323eb8f0 by Cheng Shao at 2026-01-18T21:48:19-05:00
hadrian: enable split sections for cross stage0

This patch fixes a minor issue with `splitSectionsArgs` in hadrian:
previously, it's unconditionally disabled for stage0 libraries because
it's not going to be shipped in the final bindists. But it's only true
when not cross compiling. So for now we also need to enable it for
cross stage0 as well.

- - - - -
3fadfefe by Andreas Klebinger at 2026-01-18T21:49:01-05:00
RTS: Document -K behaviour better

- - - - -
30f442a9 by Teo Camarasu at 2026-01-20T13:57:26-05:00
base: don't expose GHC.Num.{BigNat, Integer, Natural}

We no longer expose GHC.Num.{BigNat, Integer, Natural} from base instead users should get these modules from ghc-bignum.
We make this change to insulate end users from changes to GHC's implementation of big numbers.
Implements CLC proposal 359: https://github.com/haskell/core-libraries-committee/issues/359

- - - - -
75a9053d by Teo Camarasu at 2026-01-20T13:58:07-05:00
base: deprecate GHC internals in GHC.Num

Implements CLC proposal: https://github.com/haskell/core-libraries-committee/issues/360

- - - - -
9534b032 by Andreas Klebinger at 2026-01-20T13:58:50-05:00
ghc-experimental: Update Changelog

I tried to reconstruct a high level overview of the changes and when
they were made since we introduced it.

Fixes #26506

Co-authored-by: Teo Camarasu <teofilcamarasu@gmail.com>

- - - - -
346f2f5a by Cheng Shao at 2026-01-20T13:59:30-05:00
hadrian: remove RTS options in ghc-in-ghci flavour

This patch removes the RTS options passed to ghc in ghc-in-ghci
flavour, to workaround command line argument handling issue in
hls/hie-boot that results in `-O64M` instead of `+RTS -O64M -RTS`
being passed to ghc. It's not a hadrian bug per se, since ghc's own
ghc-in-ghci multi repl works fine, but we should still make sure HLS
works. Closes #26801.

- - - - -
759fd15a by Andreas Klebinger at 2026-01-21T16:05:28-05:00
Don't build GHC with -Wcompat

Without bumping the boot compiler the warnings it produces are often not
actionable leading to pointless noise.

Fixes #26800

- - - - -
3172db94 by Torsten Schmits at 2026-01-21T16:06:11-05:00
Use the correct field of ModOrigin when formatting error message listing hidden reexports

- - - - -
485c12b2 by Cheng Shao at 2026-01-21T16:06:54-05:00
Revert "hadrian: handle findExecutable "" gracefully"

This reverts commit 1e5752f64a522c4025365856d92f78073a7b3bba. The
underlying issue has been fixed in
https://github.com/haskell/directory/commit/75828696e7145adc09179111a0d631b9...
and present since 1.3.9.0, and hadrian directory lower bound is
1.3.9.0, so we can revert our own in house hack now.

- - - - -
5efb58dc by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: fix typo in TICK_ALLOC_RTS

This patch fixes a typo in the `TICK_ALLOC_RTS` macro, the original
`bytes` argument was silently dropped. The Cmm code has its own
version of `TICK_ALLOC_RTS` not affected by this typo, it affected the
C RTS, and went unnoticed because the variable `n` happened to also be
available at its call site. But the number was incorrect. Also fixes
its call site since `WDS()` is not available in C.

- - - - -
c406ea69 by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: remove broken & unused ALLOC_P_TICKY

This patch removes the `ALLOC_P_TICKY` macro from the rts, it's
unused, and its expanded code is already broken.

- - - - -
34a27e20 by Simon Peyton Jones at 2026-01-21T16:08:17-05:00
Make the implicit-parameter class have representational role

This MR addresses #26737, by making the built-in class IP
have a representational role for its second parameter.

See Note [IP: implicit parameter class] in
  ghc-internal:GHC.Internal.Classes.IP

In fact, IP is (unfortunately, currently) exposed by
base:GHC.Base, so we ran a quick CLC proposal to
agree the change:
  https://github.com/haskell/core-libraries-committee/issues/385

Some (small) compilations get faster because they only need to
load (small) interface file GHC.Internal.Classes.IP.hi,
rather than (large) GHC.Internal.Classes.hi.

Metric Decrease:
    T10421
    T12150
    T12425
    T24582
    T5837
    T5030

- - - - -
ca79475f by Cheng Shao at 2026-01-21T16:09:00-05:00
testsuite: avoid re.sub in favor of simple string replacements

This patch refactors the testsuite driver and avoids the usage of
re.sub in favor of simple string replacements when possible. The
changes are not comprehensive, and there are still a lot of re.sub
usages lingering around the tree, but this already addresses a major
performance bottleneck in the testsuite driver that might has to do
with quadratic or worse slowdown in cpython's regular expression
engine when handling certain regex patterns with large strings.
Especially on i386, and i386 jobs are the bottlenecks of all full-ci
validate pipelines!

Here are the elapsed times of testing x86_64/i386 with -j48 before
this patch:

x86_64: `Build completed in 6m06s`
i386: `Build completed in 1h36m`

And with this patch:

x86_64: `Build completed in 4m55s`
i386: `Build completed in 4m23s`

Fixes #26786.

Co-authored-by: Codex <codex@openai.com>

- - - - -
88c93796 by Zubin Duggal at 2026-01-21T16:09:42-05:00
ghc-toolchain: Also configure windres on non-windows platforms.
It may be needed for cross compilation.

Fixes #24588

- - - - -
9788c0ec by Cheng Shao at 2026-01-21T16:10:24-05:00
ghci: print external interpreter trace messages to stderr instead of stdout

This patch makes ghci print external interpreter trace messages to
stderr instead of stdout, which is a much saner choice for diagnostic
information. Closes #26807.

- - - - -
0491f08a by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: don't use CAS without PARALLEL_GC on

If we're not using the parallel GC, there is no reason to do a costly
CAS. This was flagged as taking time in a perf profile.

- - - - -
211a8f56 by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: suffix parallel GC with "par" instead of "thr"

Avoid some potential confusion (see discussion in !15351).

- - - - -
77a23cbd by fendor at 2026-01-22T03:45:08-05:00
Remove blanket ignore that covers libraries/

- - - - -
18bf7f5c by Léana Jiang at 2026-01-22T08:58:45-05:00
doc: update Flavour type in hadrian user-settings

- - - - -
3d5a1365 by Cheng Shao at 2026-01-22T08:59:28-05:00
hadrian: add missing notCross predicate for stage0 -O0

There are a few hard-coded hadrian args that pass -O0 when compiling
some heavy modules in stage0, which only makes sense when not
cross-compiling and when cross-compiling we need properly optimized
stage0 packages. So this patch adds the missing `notCross` predicate
in those places.

- - - - -
ee937134 by Matthew Pickering at 2026-01-22T09:00:10-05:00
Fix ghc-experimental GHC.Exception.Backtrace.Experimental module

This module wasn't added to the cabal file so it was never compiled or
included in the library.

- - - - -
1b490f5a by Zubin Duggal at 2026-01-22T09:00:53-05:00
hadrian: Add ghc-{experimental,internal}.cabal to the list of dependencies of the doc target
We need these files to detect the version of these libraries

Fixes #26738

- - - - -
cdb74049 by Cheng Shao at 2026-01-22T14:52:36-05:00
rts: avoid Cmm loop to initialize Array#/SmallArray#

Previously, `newArray#`/`newSmallArray#` called an RTS C function to
allocate the `Array#`/`SmallArray#`, then used a Cmm loop to
initialize the elements. Cmm doesn't have native for-loop so the code
is a bit awkward, and it's less efficient than a C loop, since the C
compiler can effectively vectorize the loop with optimizations.

So this patch moves the loop that initializes the elements to the C
side. `allocateMutArrPtrs`/`allocateSmallMutArrPtrs` now takes a new
`init` argument and initializes the elements if `init` is non-NULL.

- - - - -
4c784f00 by Cheng Shao at 2026-01-22T14:53:19-05:00
Fix testsuite run for +ipe flavour transformer

This patch makes the +ipe flavour transformer pass the entire
testsuite:

- An RTS debug option `-DI` is added, the IPE trace information is now
  only printed with `-DI`. The test cases that do require IPE trace
  are now run with `-DI`.
- The testsuite config option `ghc_with_ipe` is added, enabled when
  running the testsuite with `+ipe`, which skips a few tests that are
  sensitive to eventlog output, allocation patterns etc that can fail
  under `+ipe`.

This is the first step towards #26799.

Co-authored-by: Codex <codex@openai.com>

- - - - -
be8e5236 by Ben Gamari at 2026-01-23T03:28:45-05:00
hadrian: Bump QuickCheck upper bound

This patch bumps QuickCheck upper bound to 2.18. selftest rule
manually tested to work with current latest QuickCheck-2.17.1.0.

- - - - -
5aa328fb by Zubin Duggal at 2026-01-23T03:29:30-05:00
Add genindex to index.rst. This adds a link to the index in the navigation bar.

Fixes #26437

- - - - -
917ab8ff by Oleg Grenrus at 2026-01-23T10:52:55-05:00
Export labelThread from Control.Concurrent

- - - - -
3f5e8d80 by Cheng Shao at 2026-01-23T10:53:37-05:00
ci: only push perf notes on master/release branches

This patch fixes push_perf_notes logic in ci.sh to only push perf
notes on master/release branches. We used to unconditionally push perf
notes even in MRs, but the perf numbers in the wip branches wouldn't
be used as baseline anyway, plus this is causing a space leak in the
ghc-performance-notes repo. See #25317 for the perf notes repo size
problem.

Co-authored-by: Codex <codex@openai.com>

- - - - -
414b9593 by Cheng Shao at 2026-01-24T07:11:51-05:00
ci: remove duplicate keys in .gitlab-ci.yml

This patch removes accidentally duplicate keys in `.gitlab-ci.yml`.
The YAML spec doesn't allow duplicate keys in the first place, and
according to GitLab docs
(https://docs.gitlab.com/ci/yaml/yaml_optimization/#anchors), the
latest key overrides the earlier entries.

- - - - -
e5cb5491 by Cheng Shao at 2026-01-24T07:12:34-05:00
hadrian: drop obsolete configure/make builder logic for libffi

This patch drops obsolete hadrian logic around `Configure
libffiPath`/`Make libffiPath` builders, they are no longer needed
after libffi-clib has landed. Closes #26815.

- - - - -
2d160222 by Simon Hengel at 2026-01-24T07:13:17-05:00
Fix typo in roles.rst
- - - - -
56db94f7 by Peter Trommler at 2026-01-26T11:26:18+01:00
PPC NCG: Generate clear right insn at arch width

The clear right immediate (clrrxi) is only available in word and
doubleword width. Generate clrrxi instructions at architecture
width for all MachOp widths.

Fixes #24145

- - - - -
5957a8ad by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00
Add operations for obtaining operating-system handles

This contribution implements CLC proposal #369. It adds operations for
obtaining POSIX file descriptors and Windows handles that underlie
Haskell handles. Those operating system handles can also be obtained
without such additional operations, but this is more involved and, more
importantly, requires using internals.

- - - - -
86a0510c by Greg Steuck at 2026-01-27T06:12:34-05:00
Move flags to precede patterns for grep and read files directly

This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools.
There's no reason to use cat and pipe where direct file argument works.

- - - - -
50761451 by Cheng Shao at 2026-01-27T21:51:23-05:00
ci: update darwin boot ghc to 9.10.3

This patch updates darwin boot ghc to 9.10.3, along with other related
updates, and pays off some technical debt here:

- Update `nixpkgs` and use the `nixpkgs-25.05-darwin` channel.
- Update the `niv` template.
- Update LLVM to 21 and update `llvm-targets` to reflect LLVM 21
  layout changes for arm64/x86_64 darwin targets.
- Use `stdenvNoCC` to prevent nix packaged apple sdk from being used
  by boot ghc, and manually set `DEVELOPER_DIR`/`SDKROOT` to enforce
  the usage of system-wide command line sdk for macos.
- When building nix derivation for boot ghc, run `configure` via the
  `arch` command so that `configure` and its subprocesses pick up the
  manually specified architecture.
- Remove the previous horrible hack that obliterates `configure` to
  make autoconf test result in true. `configure` now properly does its
  job.
- Remove the now obsolete configure args and post install settings
  file patching logic.
- Use `scheme-small` for texlive to avoid build failures in certain
  unused texlive packages, especially on x86_64-darwin.

- - - - -
94dcd15e by Matthew Pickering at 2026-01-27T21:52:05-05:00
Evaluate backtraces for "error" exceptions at the moment they are thrown

See Note [Capturing the backtrace in throw] and
Note [Hiding precise exception signature in throw] which explain the
implementation.

This commit makes `error` and `throw` behave the same with regard to
backtraces. Previously, exceptions raised by `error` would not contain
useful IPE backtraces.

I did try and implement `error` in terms of `throw` but it started to
involve putting diverging functions into hs-boot files, which seemed to
risky if the compiler wouldn't be able to see if applying a function
would diverge.

CLC proposal: https://github.com/haskell/core-libraries-committee/issues/383

Fixes #26751

- - - - -
ef35e3ea by Teo Camarasu at 2026-01-27T21:52:46-05:00
ghc-internal: move all Data instances to Data.Data

Most instances of Data are defined in GHC.Internal.Data.Data.
Let's move all remaining instance there.

This moves other modules down in the dependency hierarchy allowing for
more parallelism, and it decreases the likelihood that we would need to
load this heavy .hi file if we don't actually need it.

Resolves #26830

Metric Decrease:
    T12227
    T16875

- - - - -
5e0ec555 by sheaf at 2026-01-28T06:56:38-05:00
Add test case for #25679

This commit adds the T25679 test case. The test now passes, thanks to
commit 1e53277af36d3f0b6ad5491f70ffc5593a49dcfd.

Fixes #25679

- - - - -
f1cd1611 by sheaf at 2026-01-28T06:56:38-05:00
Improve defaulting of representational equalities

This commit makes the defaulting of representational equalities, introduced
in 1e53277a, a little bit more robust. Now, instead of calling the eager
unifier, it calls the full-blown constraint solver, which means that it can
handle some subtle situations, e.g. involving functional dependencies and
type-family injectivity annotations, such as:

  type family F a = r | r -> a
  type instance F Int = Bool

  [W] F beta ~R Bool

- - - - -
25edf516 by sheaf at 2026-01-28T06:56:38-05:00
Improve errors for unsolved representational equalities

This commit adds a new field of CtLoc, CtExplanations, which allows the
typechecker to leave some information about what it has done. For the moment,
it is only used to improve error messages for unsolved representational
equalities. The typechecker will now accumulate, when unifying at
representational role:

  - out-of-scope newtype constructors,
  - type constructors that have nominal role in a certain argument,
  - over-saturated type constructors,
  - AppTys, e.g. `c a ~R# c b`, to report that we must assume that 'c' has
    nominal role in its parameters,
  - data family applications that do not reduce, potentially preventing
    newtype unwrapping.

Now, instead of having to re-construct the possible errors after the fact,
we simply consult the CtExplanations field.

Additionally, this commit modifies the typechecker error messages that
concern out-of-scope newtype constructors. The error message now depends
on whether we have an import suggestion to provide to the user:

  - If we have an import suggestion for the newtype constructor,
    the message will be of the form:

      The data constructor MkN of the newtype N is out of scope
      Suggested fix: add 'MkN' to the import list in the import of 'M'

  - If we don't have any import suggestions, the message will be
    of the form:

      NB: The type 'N' is an opaque newtype, whose constructor is hidden

Fixes #15850, #20289, #20468, #23731, #25949, #26137

- - - - -
4d0e6da1 by Simon Peyton Jones at 2026-01-28T06:57:19-05:00
Fix two bugs in short-cut constraint solving

There are two main changes here:

* Use `isSolvedWC` rather than `isEmptyWC` in `tryShortCutSolver`
  The residual constraint may have some fully-solved, but
  still-there implications, and we don't want them to abort short
  cut solving!  That bug caused #26805.

* In the short-cut solver, we abandon the fully-solved residual
  constraint; but we may thereby lose track of Givens that are
  needed, and either report them as redundant or prune evidence
  bindings that are in fact needed.

  This bug stopped the `constraints` package from compiling;
  see the trail in !15389.

The second bug led me to (another) significant refactoring
of the mechanism for tracking needed EvIds.   See the new
   Note [Tracking needed EvIds] in GHC.Tc.Solver.Solve
It's simpler and much less head-scratchy now.

Some particulars:

* An EvBindsVar now tracks NeededEvIds

* We deal with NeededEvIds for an implication only when it is
  fully solved.  Much simpler!

* `tryShortCutTcS` now takes a `TcM WantedConstraints` rather than
  `TcM Bool`, so that is can plumb the needed EvIds correctly.

* Remove `ic_need` and `ic_need_implic` from Implication (hooray),
  and add `ics_dm` and `ics_non_dm` to `IC_Solved`.

Pure refactor
* Shorten data constructor `CoercionHole` to `CH`, following
  general practice in GHC.
* Rename `EvBindMap` to `EvBindsMap` for consistency

- - - - -
662480b7 by Cheng Shao at 2026-01-28T06:58:00-05:00
ci: use debian validate bindists instead of fedora release bindists in testing stage

This patch changes the `abi-test`, `hadrian-multi` and `perf` jobs in
the full-ci pipeline testing stage to use debian validate bindists
instead of fedora release bindists, to increase pipeline level
parallelism and allow full-ci pipelines to complete earlier. Closes #26818.

- - - - -
39581ec6 by Cheng Shao at 2026-01-28T06:58:40-05:00
ci: run perf test with -j$cores

This patch makes the perf ci job compile Cabal with -j$cores to speed
up the job.

- - - - -
607b287b by Wolfgang Jeltsch at 2026-01-28T15:41:53+02:00
Remove `GHC.Desugar` from `base`

`GHC.Desugar` was deprecated and should have been removed in GHC 9.14.
However, the removal was forgotten, although there was a code block that
was intended to trigger a compilation error when the GHC version in use
was 9.14 or later. This code sadly didn’t work, because the
`__GLASGOW_HASKELL__` macro was misspelled as `__GLASGOW_HASKELL`.

- - - - -
e8f5a45d by sterni at 2026-01-29T04:19:18-05:00
users_guide: fix runtime error during build with Sphinx 9.1.0

Appears that pathto is stricter about what it accepts now.
Tested Sphinx 8.2.3 and 9.1.0 on the ghc-9.10 branch.

Resolves #26810.

Co-authored-by: Martin Weinelt <hexa@darmstadt.ccc.de>

- - - - -
ce2d62fb by Jessica Clarke at 2026-01-29T19:48:51-05:00
PPC NCG: Use libcall for 64-bit cmpxchg on 32-bit PowerPC

There is no native instruction for this, and even if there were a
register pair version we could use, the implementation here is assuming
the values fit in a single register, and we end up only using / defining
the low halves of the registers.

Fixes: b4d39adbb5 ("PrimOps: Add CAS op for all int sizes")
Fixes: #23969

- - - - -
43d97761 by Michael Karcher at 2026-01-29T19:49:43-05:00
NCG for PPC: add pattern for CmmRegOff to iselExpr64

Closes #26828
- - - - -
aeeb4a20 by Matthew Pickering at 2026-01-30T11:42:47-05:00
determinism: Use deterministic map for Strings in TyLitMap

When generating typeable evidence the types we need evidence for all
cached in a TypeMap, the order terms are retrieved from a type map
determines the order the bindings appear in the program.

A TypeMap is quite diligent to use deterministic maps, apart from in the
TyLitMap, which uses a UniqFM for storing strings, whose ordering
depends on the Unique of the FastString.

This can cause non-deterministic .hi and .o files.

An unexpected side-effect is the error message but RecordDotSyntaxFail8
changing. I looked into this with Sam and this change caused the
constraints to be solved in a different order which results in a
slightly different error message. I have accepted the new test, since
the output before was non-deterministic and the new output is consistent
with the other messages in that file.

Fixes #26846

- - - - -
9e4d70c2 by Andrew Lelechenko at 2026-01-30T11:43:29-05:00
Upgrade text submodule to 2.1.4

- - - - -
631fa5ae by Recursion Ninja at 2026-01-31T22:30:11+00:00
Decouple `L.S.H.Decls` from importing `GHC.Types.Basic`

Data-types within `GHC.Types.Basic` which describe components of
the AST are migrated to `Language.Haskell.Syntax.Basic`. Related
function definitions are also moved.

Types moved to L.H.S. because they are part of the AST:
  * TopLevelFlag
  * RuleName

Types moved from L.H.S. to GHC.Hs. because they are not needed in the AST:
  * TyConFlavour
  * TypeOrData
  * NewOrData

Migrated instances:
  * `Outputable` instances moved to in `GHC.Utils.Outputable`
  * `Binary` instance of `Boxity` moved to to `GHC.Utils.Binary`
  * Other `Binary` instances are orphans to be migrated later.

The `OverlapMode` data-type is given a TTG extension point.
The `OverlapFlag` data-type, which depends on `OverlapMode`,
is updated to support `OverlapMode` with a GHC "pass" type paramerter.
In order to avoid module import cycles, `OverlapMode` and `OverlapFlag`
are migrated to new modules (no way around this).

  * Migrated `OverlapMode` to new module `Language.Haskell.Syntax.Overlap`
  * Migrated `OverlapFlag` to new module `GHC.Hs.Decls.Overlap`

- - - - -
9769cc03 by Simon Hengel at 2026-02-01T04:21:03-05:00
Update the documentation for MultiWayIf (fixes #25376)

(so that it matches the implementation)

- - - - -
5fc9442a by Peter Trommler at 2026-02-01T04:21:44-05:00
hadrian: Fix dependency generation for assembler

Assembler files allow # for comments unless in column 1. A modern
cpp for C treats those a preprocessor directives. We tell gcc that
a .S file is assembler with cpp and not C.

Fixes #26819

- - - - -
269c4087 by Simon Peyton Jones at 2026-02-01T19:38:10-05:00
Include current phase in the range for rule/unfoldings

This MR fixes a bad loop in the compiler: #26826.

The fix is to add (WAR2) to
   Note [What is active in the RHS of a RULE or unfolding?]
in GHC.Core.Opt.Simplify.Utils

- - - - -
ddf1434f by Vladislav Zavialov at 2026-02-01T19:38:52-05:00
Refactor: merge HsMultilineString into HsString (#26860)

Before this patch, HsLit defined two separate constructors to represent
single-line and multi-line strings:

	data HsLit x
	  ...
	  | HsString (XHsString x) FastString
	  | HsMultilineString (XHsMultilineString x) FastString

I found this to be an unnecessary complication and an obstacle to unifying
HsLit with HsTyLit. Now we use HsString for both kinds of literals.

One user-facing change here is `ppr (HsString st s)` behaving differently for
single-line strings containing newlines:

	x = "first line \
	    \asdf\n\
	    \second line"

Previously, the literal was fed to `ftext` with its newlines, producing an
ill-formed SDoc. This issue is now addressed by using `split` for both
single-line and multi-line strings:

	vcat $ map text $ split '\n' (unpackFS src)

See the parser/should_fail/T26860ppr test.

In addition (and unrelatedly to the main payload of this patch),
drop the unused pmPprHsLit helper.

- - - - -
2b4f463c by Simon Peyton Jones at 2026-02-02T17:32:32+00:00
Remove exprIsCheap from doFloatFromRhs

See #26854 and Note [Float when expandable]

This patch simplifies the code, by removing an extra unnecessary test.

- - - - -
9db7f21f by Brandon Chinn at 2026-02-03T09:15:10-05:00
Refactor: make function patterns exhaustive

Also added missing (==) logic for:
  * HsMultilineString
  * HsInt{8,16,32}
  * HsWord{8,16,32}

- - - - -
aa9c5e2c by Hécate Kleidukos at 2026-02-03T15:58:35-05:00
driver: Hide source paths at verbosity level 1 by default

- - - - -
c64cca1e by mangoiv at 2026-02-03T15:59:29-05:00
ExplicitLevelImports: check staging for types just like for values

Previously, imported types were entirely exempted from staging checks as
the implicit stage persistance assumed to be all imported types to be
well staged. ExplicitLevelImports' change specification, however, does
not do such an exemption. Thus we want to introduce such a check, just
like we have for values.
ExplicitLevelImports does not, however, talk about local names - from
its perspective, we could theoretically keep treating locally introduced
types specially - e.g. an ill-staged used in a quote would only emit a
warning, not an error. To allow for a potential future migration away
from such wrinkles as the staging check in notFound
(see  Note [Out of scope might be a staging error]) we consistently do
the strict staging check that we also do for value if ExplicitLevelImports
is on.

Closes #26098

- - - - -
5f0dbeb6 by Simon Hengel at 2026-02-03T16:00:12-05:00
Use Haddock formatting in deprecation message of `initNameCache`
- - - - -
01ecb612 by Andreas Klebinger at 2026-02-04T09:56:25-05:00
testsuite: Explicitly use utf-8 encoding in rts-includes linter.

Not doing so caused failures on windows, as python failed to pick a
reasonable encoding even with locale set.

Fixes #26850

- - - - -
ea0d1317 by Zubin Duggal at 2026-02-04T09:57:06-05:00
Bump transformers submodule to 0.6.3.0

Fixes #26790

- - - - -
cbe4300e by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix subtle bug in GHC.Core.Utils.mkTick

This patch fixes a decade-old bug in `mkTick`, which
could generate type-incorrect code!  See the diagnosis
in #26772.

The new code is simpler and easier to understand.
(As #26772 says, I think it could be improved further.)

- - - - -
a193a8da by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Modify a debug-trace in the Simplifier

...just to show a bit more information.

- - - - -
b579dfdc by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix long-standing interaction between ticks and casts

The code for Note [Eliminate Identity Cases] was simply wrong when
ticks and casts interacted.  This patch fixes the interaction.

It was shown up when validating #26772, although it's not the exactly
the bug that's reported by #26772.  Nor is it easy to reproduce, hence
no regression test.

- - - - -
fac0de1e by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump Cabal submodule to 3.16.1.0

- - - - -
00589122 by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump deepseq submodule to 1.5.2.0

Also:

- Get rid of usage of deprecated `NFData` function instance in the
  compiler
- `T21391` still relies on `NFData` function instance, add
  `-Wno-deprecations` for the time being.

- - - - -
84474c71 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump directory submodule to 1.3.10.1

- - - - -
1a9f4662 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump exceptions submodule to 0.10.12

- - - - -
2e39a340 by Peng Fan at 2026-02-07T03:42:01-05:00
NCG/LA64: adjust register usage to avoid src-register being clobbered

- - - - -
9faf1b35 by Teo Camarasu at 2026-02-07T03:42:43-05:00
ghc-internal: Delete unnecessary GHC.Internal.Data.Ix

This module merely re-exports GHC.Internal.Ix. It was copied from
`base` when `ghc-internal` was split, but there is no reason to have
this now. So, let's delete it.

Resolves #26848

- - - - -
d112b440 by Sven Tennie at 2026-02-07T10:47:56-05:00
Add cabal.project file to generate-ci

This fixes the HLS setup for our CI code generation script
(generate-ci).

The project file simply makes `generate-ci` of the cabal file
discoverable.

- - - - -
5339f6f0 by Andreas Klebinger at 2026-02-07T10:48:40-05:00
CI: Don't collapse test results.

This puts test output back into the primary test log instead of a
subsection removing the need to expand a section to see test results.

While the intention was good in practice the old behaviour mostly wastes time
by requiring expansion of the section.

Fixes #26882

- - - - -
0e1cd2e0 by Evan Piro at 2026-02-08T10:35:16-08:00
Linker.MacOS reduce dynflags import

- - - - -
1c79a4cd by Michael Alan Dorman at 2026-02-09T08:11:51-05:00
Remove `extra_src_files` variable from `testsuite/driver/testlib.py`

While reading through the test harness code, I noticed this variable
with a TODO attached that referenced #12223.  Although that bug is
closed, it strongly implied that this special-case variable that only
affected a single test was expected to be removed at some point.

I also looked at 3415bcaa0b1903b5e12dfaadb5b774718e406eab---where it
was added---whose commit message suggested that it would have been
desirable to remove it, but that there were special circumstances that
meant it had to remain (though it doesn't elucidate what those special
circumstances are).

However, the special circumstances were mentioned as if the test was
in a different location than is currently is, so I decided to try
changing the test to use the standard `extra_files` mechanism, which
works in local testing.

This also seems like a reasonable time to remove the script that was
originally used in the transition, since it doesn't really serve a
purpose anymore.

- - - - -
0020e38a by Matthew Pickering at 2026-02-09T17:29:14-05:00
determinism: Use a stable sort in WithHsDocIdentifiers binary instance

`WithHsDocIdentifiers` is defined as

```
 71 data WithHsDocIdentifiers a pass = WithHsDocIdentifiers
 72   { hsDocString      :: !a
 73   , hsDocIdentifiers :: ![Located (IdP pass)]
 74   }
```

This list of names is populated from `rnHsDocIdentifiers`, which calls
`lookupGRE`, which calls `lookupOccEnv_AllNameSpaces`, which calls
`nonDetEltsUFM` and returns the results in an order depending on
uniques.

Sorting the list with a stable sort before returning the interface makes
the output deterministic and follows the approach taken by other fields
in `Docs`.

Fixes #26858

- - - - -
89898ce6 by echoumcp1 at 2026-02-09T17:30:01-05:00
Replace putstrln with logMsg in handleSeqHValueStatus

Fixes #26549

- - - - -
7c52c4f9 by John Paul Adrian Glaubitz at 2026-02-10T13:52:43-05:00
rts: Switch prim to use modern atomic compiler builtins

The __sync_*() atomic compiler builtins have been deprecated in GCC
for a while now and also don't provide variants for 64-bit values
such as __sync_fetch_and_add_8().

Thus, replace them with the modern __atomic_*() compiler builtins and
while we're at it, also drop the helper macro CAS_NAND() which is now
no longer needed since we stopped using the __sync_*() compiler builtins
altogether.

Co-authored-by: Ilias Tsitsimpis <iliastsi@debian.org>

Fixes #26729

- - - - -
cf60850a by Recursion Ninja at 2026-02-10T13:53:27-05:00
Decoupling L.H.S.Decls from GHC.Types.ForeignCall

  - Adding TTG extension point for 'CCallTarget'
  - Adding TTG extension point for 'CType'
  - Adding TTG extension point for 'Header'
  - Moving ForeignCall types that do not need extension
    to new L.H.S.Decls.Foreign module
  - Replacing 'Bool' parameters with descriptive data-types
    to increase clairty and prevent "Boolean Blindness"

- - - - -
11a04cbb by Eric Lee at 2026-02-11T09:20:46-05:00
Derive Semigroup/Monoid for instances believed could be derived in #25871

- - - - -
15d9ce44 by Eric Lee at 2026-02-11T09:20:46-05:00
add Ghc.Data.Pair deriving

- - - - -
c85dc170 by Evan Piro at 2026-02-11T09:21:45-05:00
Linker.MacOS reduce options import

- - - - -
a541dd83 by Chris Wendt at 2026-02-11T16:06:41-05:00
Initialize plugins for `:set +c` in GHCi

Fixes #23110.

- - - - -
0f5a73bc by Cheng Shao at 2026-02-11T16:07:27-05:00
compiler: add Binary Text instance

This patch adds `Binary` instance for strict `Text`, in preparation of
making `Text` usable in certain GHC API use cases (e.g. haddock). This
also introduces `text` as a direct dependency of the `ghc` package.

- - - - -
9e58b8a1 by Cheng Shao at 2026-02-11T16:08:10-05:00
ghc-toolchain: add C11 check

This patch partially reverts commit
b8307eab80c5809df5405d76c822bf86877f5960 that removed C99 check in
autoconf/ghc-toolchain. Now we:

- No longer re-implement `FP_SET_CFLAGS_C11` similar to
  `FP_SET_CFLAGS_C99` in the past, since autoconf doesn't provide a
  convenient `AC_PROG_CC_C11` function. ghc-toolchain will handle it
  anyway.
- The Cmm CPP C99 check is relanded and repurposed for C11.
- The C99 logic in ghc-toolchain is relanded and repurposed for C11.
- The C99 check in Stg.h is corrected to check for C11. The obsolete
  _ISOC99_SOURCE trick is dropped.
- Usages of `-std=gnu99` in the testsuite are corrected to use
  `-std=gnu11`.

Closes #26908.

- - - - -
4df0adf6 by Simon Peyton Jones at 2026-02-11T21:50:13-05:00
Simplify the treatment of static forms

This MR implements GHC proposal 732: simplify static forms,
   https://github.com/ghc-proposals/ghc-proposals/pull/732
thereby addressing #26556.

See `Note [Grand plan for static forms]` in GHC.Iface.Tidy.StaticPtrTable

The main changes are:

* There is a new, simple rule for (static e), namely that the free
  term variables of `e` must be bound at top level.  The check is
  done in the `HsStatic` case of `GHC.Rename.Expr.rnExpr`

* That in turn substantially simplifies the info that the typechecker
  carries around in its type environment.  Hooray.

* The desugarer emits static bindings to top level directly; see the
  `HsStatic` case of `dsExpr`.

* There is no longer any special static-related magic in the FloatOut
  pass.  And the main Simplifier pipeline no longer needs a special case
  to run FloatOut even with -O0.  Hooray.

All this forced an unexpected change to the pattern match checker. It
recursively invokes the main Hs desugarer when it wants to take a look
at a term to spot some special cases (notably constructor applications).
We don't want to emit any nested (static e) bindings to top level a
second time!  Yikes.

That forced a modest refactor in GHC.HsToCore.Pmc:

* The `dsl_nablas` field of `DsLclEnv` now has a `NoPmc` case, which says
  "I'm desugaring just for pattern-match checking purposes".

* When that flag is set we don't emit static binds.

That in turn forces a cascade of refactoring, but the net effect is an
improvement; less risk of duplicated (even exponential?) work.

See Note [Desugaring HsExpr during pattern-match checking].

10% metric decrease, on some architectures, of compile-time max-bytes-used on T15304.

Metric Decrease:
    T15304

- - - - -
7922f728 by Teo Camarasu at 2026-02-11T21:50:58-05:00
ghc-internal: avoid depending on GHC.Internal.Exts

This module is mostly just re-exports. It made sense as a user-facing
module, but there's no good reason ghc-internal modules should depend on
it and doing so linearises the module graph

- move considerAccessible to GHC.Internal.Magic

Previously it lived in GHC.Internal.Exts, but it really deserves to live
along with the other magic function, which are already re-exported from .Exts

- move maxTupleSize to GHC.Internal.Tuple

This previously lived in GHC.Internal.Exts but a comment already said it
should be moved to .Tuple

Resolves #26832

- - - - -
b6a4a29b by Eric Lee at 2026-02-11T21:51:55-05:00
Remove unused Semigroup imports to fix GHC 9.14 bootstrapping

- - - - -
99d8c146 by Simon Peyton Jones at 2026-02-12T17:36:59+00:00
Fix subtle bug in cast worker/wrapper

See (CWw4) in Note [Cast worker/wrapper].

The true payload is in the change to the definition of
   GHC.Types.Id.Info.hasInlineUnfolding
Everthing else is just documentation.

There is a 2% compile time decrease for T13056;
I'll take the win!

Metric Decrease:
    T13056

- - - - -
530e8e58 by Simon Peyton Jones at 2026-02-12T20:17:23-05:00
Add regression tests for four StaticPtr bugs

Tickets #26545, #24464, #24773, #16981 are all solved by the
recently-landed MR

    commit 318ee13bcffa6aa8df42ba442ccd92aa0f7e210c
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Mon Oct 20 23:07:20 2025 +0100

    Simplify the treatment of static forms

This MR just adds regression tests for them.

- - - - -
4157160f by Cheng Shao at 2026-02-13T06:27:04-05:00
ci: remove unused hlint-ghc-and-base job definition

This patch removes the unused `hlint-ghc-and-base` job definition,
it's never run since !9806. Note that hadrian lint rules still work
locally, so anyone that wishes to run hlint on the codebase can
continue to do so in their local worktree.

- - - - -
039f1977 by Cheng Shao at 2026-02-13T06:27:47-05:00
wasm: use import.meta.main for proper distinction of nodejs main modules

This patch uses `import.meta.main` for proper distinction of nodejs
main modules, especially when the main module might be installed as a
symlink. Fixes #26916.

- - - - -
14f485ee by ARATA Mizuki at 2026-02-17T09:09:24+09:00
Support more x86 extensions: AVX-512 {BW,DQ,VL} and GFNI

Also, mark AVX-512 ER and PF as deprecated.

AVX-512 instructions can be used for certain 64-bit integer vector operations.

GFNI can be used to implement bitReverse (currently not used by NCG, but LLVM may use it).

Closes #26406
Addresses #26509

- - - - -
016f79d5 by fendor at 2026-02-17T09:16:16-05:00
Hide implementation details from base exception stack traces

Ensure we hide the implementation details of the exception throwing mechanisms:

* `undefined`
* `throwSTM`
* `throw`
* `throwIO`
* `error`

The `HasCallStackBacktrace` should always have a length of exactly 1,
not showing internal implementation details in the stack trace, as these
are vastly distracting to end users.

CLC proposal [#387](https://github.com/haskell/core-libraries-committee/issues/387)

- - - - -
4f2840f2 by Brian J. Cardiff at 2026-02-17T17:04:08-05:00
configure: Accept happy-2.2

In Jan 2026 happy-2.2 was released. The most sensible change is https://github.com/haskell/happy/issues/335 which didn't trigger in a fresh build

- - - - -
10b4d364 by Duncan Coutts at 2026-02-17T17:04:52-05:00
Fix errors in the documentation of the eventlog STOP_THREAD status codes

Fix the code for BlockedOnMsgThrowTo.

Document all the known historical warts.

Fixes issue #26867

- - - - -
c5e15b8b by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: use snippets for all list examples

- generate snippet output for docs
- reduce font size to better fit snippets
- Use only directive to guard html snippets
- Add latex snippets for lists

- - - - -
d388bac1 by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: Place the snippet input and output together

- Put the output seemingly inside the example box

- - - - -
016fa306 by Samuel Thibault at 2026-02-18T05:08:35-05:00
Fix linking against libm by moving the -lm option

For those systems that need -lm for getting math functions, this is
currently added on the link line very early, before the object files being
linked together. Newer toolchains enable --as-needed by default, which means
-lm is ignored at that point because no object requires a math function
yet. With such toolchains, we thus have to add -lm after the objects, so the
linker actually includes libm in the link.

- - - - -
68bd0805 by Teo Camarasu at 2026-02-18T05:09:19-05:00
ghc-internal:  Move GHC.Internal.Data.Bool to base

This is a tiny module that only defines bool :: Bool -> a -> a -> a. We can just move this to base and delete it from ghc-internal. If we want this functionality there we can just use a case statement or if-then expression.

Resolves 26865

- - - - -
303ad3cc by Andreas Klebinger at 2026-02-18T17:37:18+01:00
Bump nofib submodule.

We accrued a number of nofib fixes we want to have here.

- - - - -

3643 changed files:

- .gitattributes
- .gitignore
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/common.sh
- .gitlab/darwin/nix/sources.json
- .gitlab/darwin/toolchain.nix
- + .gitlab/generate-ci/cabal.project
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/hello.hs
- + .gitlab/issue_templates/get-verified.md
- .gitlab/jobs.yaml
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- .gitlab/rel_eng/upload.sh
- .gitlab/rel_eng/upload_ghc_libs.py
- .gitlab/test-metrics.sh
- .gitmodules
- .mailmap
- CODEOWNERS
- README.md
- cabal.project-reinstall
- compile_flags.txt
- compiler/CodeGen.Platform.h
- compiler/GHC.hs
- compiler/GHC/Builtin/Names.hs
- compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/PrimOps/Ids.hs
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/Types/Literals.hs
- compiler/GHC/Builtin/Types/Prim.hs
- compiler/GHC/Builtin/Uniques.hs
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- + compiler/GHC/ByteCode/Breakpoints.hs
- compiler/GHC/ByteCode/InfoTable.hs
- compiler/GHC/ByteCode/Instr.hs
- compiler/GHC/ByteCode/Linker.hs
- + compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Cmm.hs
- compiler/GHC/Cmm/BlockId.hs
- compiler/GHC/Cmm/CLabel.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/Cmm/Config.hs
- compiler/GHC/Cmm/ContFlowOpt.hs
- compiler/GHC/Cmm/Dataflow.hs
- compiler/GHC/Cmm/Dataflow/Block.hs
- compiler/GHC/Cmm/Dataflow/Graph.hs
- compiler/GHC/Cmm/Dataflow/Label.hs
- compiler/GHC/Cmm/DebugBlock.hs
- compiler/GHC/Cmm/Dominators.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/Graph.hs
- compiler/GHC/Cmm/Info.hs
- compiler/GHC/Cmm/Info/Build.hs
- compiler/GHC/Cmm/InitFini.hs
- compiler/GHC/Cmm/LRegSet.hs
- compiler/GHC/Cmm/LayoutStack.hs
- compiler/GHC/Cmm/Lint.hs
- 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/ProcPoint.hs
- compiler/GHC/Cmm/Reducibility.hs
- compiler/GHC/Cmm/Reg.hs
- compiler/GHC/Cmm/Sink.hs
- compiler/GHC/Cmm/Switch.hs
- compiler/GHC/Cmm/Switch/Implement.hs
- compiler/GHC/Cmm/ThreadSanitizer.hs
- compiler/GHC/Cmm/Type.hs
- compiler/GHC/Cmm/UniqueRenamer.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/AArch64/RegInfo.hs
- compiler/GHC/CmmToAsm/BlockLayout.hs
- compiler/GHC/CmmToAsm/CFG.hs
- compiler/GHC/CmmToAsm/CPrim.hs
- compiler/GHC/CmmToAsm/Config.hs
- compiler/GHC/CmmToAsm/Dwarf/Constants.hs
- compiler/GHC/CmmToAsm/Dwarf/Types.hs
- compiler/GHC/CmmToAsm/Format.hs
- + compiler/GHC/CmmToAsm/LA64.hs
- + compiler/GHC/CmmToAsm/LA64/CodeGen.hs
- + compiler/GHC/CmmToAsm/LA64/Cond.hs
- + compiler/GHC/CmmToAsm/LA64/Instr.hs
- + compiler/GHC/CmmToAsm/LA64/Ppr.hs
- + compiler/GHC/CmmToAsm/LA64/RegInfo.hs
- + compiler/GHC/CmmToAsm/LA64/Regs.hs
- compiler/GHC/CmmToAsm/Monad.hs
- compiler/GHC/CmmToAsm/PIC.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/Ppr.hs
- compiler/GHC/CmmToAsm/PPC/RegInfo.hs
- compiler/GHC/CmmToAsm/Ppr.hs
- compiler/GHC/CmmToAsm/RV64/CodeGen.hs
- compiler/GHC/CmmToAsm/RV64/Instr.hs
- compiler/GHC/CmmToAsm/RV64/Ppr.hs
- compiler/GHC/CmmToAsm/Reg/Graph.hs
- compiler/GHC/CmmToAsm/Reg/Graph/Coalesce.hs
- compiler/GHC/CmmToAsm/Reg/Graph/Spill.hs
- compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs
- compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs
- compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
- compiler/GHC/CmmToAsm/Reg/Linear.hs
- compiler/GHC/CmmToAsm/Reg/Linear/AArch64.hs
- compiler/GHC/CmmToAsm/Reg/Linear/Base.hs
- compiler/GHC/CmmToAsm/Reg/Linear/FreeRegs.hs
- compiler/GHC/CmmToAsm/Reg/Linear/JoinToTargets.hs
- + compiler/GHC/CmmToAsm/Reg/Linear/LA64.hs
- compiler/GHC/CmmToAsm/Reg/Linear/StackMap.hs
- compiler/GHC/CmmToAsm/Reg/Linear/State.hs
- compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
- compiler/GHC/CmmToAsm/Reg/Linear/X86_64.hs
- compiler/GHC/CmmToAsm/Reg/Liveness.hs
- + compiler/GHC/CmmToAsm/Reg/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Target.hs
- compiler/GHC/CmmToAsm/Wasm.hs
- compiler/GHC/CmmToAsm/Wasm/Asm.hs
- compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
- compiler/GHC/CmmToAsm/Wasm/Types.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToAsm/X86/Ppr.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm.hs
- compiler/GHC/CmmToLlvm/Base.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/CmmToLlvm/Data.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Class.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion.hs-boot
- compiler/GHC/Core/Coercion/Axiom.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/ConLike.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/DataCon.hs-boot
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/InstEnv.hs
- compiler/GHC/Core/LateCC/OverloadedCalls.hs
- compiler/GHC/Core/LateCC/TopLevelBinds.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Lint/Interactive.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Map/Expr.hs
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/CSE.hs
- compiler/GHC/Core/Opt/CallArity.hs
- compiler/GHC/Core/Opt/CallerCC.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/CprAnal.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Pipeline.hs
- compiler/GHC/Core/Opt/Pipeline/Types.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Inline.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/Simplify/Monad.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/WorkWrap.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/PatSyn.hs
- compiler/GHC/Core/Ppr.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/Reduction.hs
- compiler/GHC/Core/RoughMap.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/Rules/Config.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/Tidy.hs
- compiler/GHC/Core/TyCo/Compare.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/Ppr.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCo/Tidy.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/TyCon/Env.hs
- compiler/GHC/Core/TyCon/RecWalk.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Type.hs-boot
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unfold/Make.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToStg.hs
- + compiler/GHC/CoreToStg/AddImplicitBinds.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/Bag.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Data/FlatBag.hs
- compiler/GHC/Data/Graph/Collapse.hs
- compiler/GHC/Data/Graph/Color.hs
- compiler/GHC/Data/Graph/Directed.hs
- compiler/GHC/Data/Graph/Directed/Reachability.hs
- compiler/GHC/Data/IOEnv.hs
- compiler/GHC/Data/List/Infinite.hs
- compiler/GHC/Data/List/NonEmpty.hs
- compiler/GHC/Data/Maybe.hs
- compiler/GHC/Data/OsPath.hs
- compiler/GHC/Data/Pair.hs
- compiler/GHC/Data/SmallArray.hs
- compiler/GHC/Data/Stream.hs
- compiler/GHC/Data/Strict.hs
- compiler/GHC/Data/StringBuffer.hs
- compiler/GHC/Data/TrieMap.hs
- compiler/GHC/Data/Word64Map.hs
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Map/Lazy.hs
- compiler/GHC/Driver/Backend.hs
- compiler/GHC/Driver/Backend/Internal.hs
- compiler/GHC/Driver/Backpack.hs
- + compiler/GHC/Driver/ByteCode.hs
- compiler/GHC/Driver/CmdLine.hs
- compiler/GHC/Driver/CodeOutput.hs
- compiler/GHC/Driver/Config.hs
- compiler/GHC/Driver/Config/CmmToAsm.hs
- compiler/GHC/Driver/Config/Core/Lint.hs
- compiler/GHC/Driver/Config/Core/Lint/Interactive.hs
- compiler/GHC/Driver/Config/Core/Opt/Simplify.hs
- compiler/GHC/Driver/Config/Core/Rules.hs
- compiler/GHC/Driver/Config/Finder.hs
- + compiler/GHC/Driver/Config/Interpreter.hs
- compiler/GHC/Driver/Config/Linker.hs
- compiler/GHC/Driver/Config/Stg/Debug.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Driver/Config/Tidy.hs
- + compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Driver/Env/KnotVars.hs
- compiler/GHC/Driver/Env/Types.hs
- compiler/GHC/Driver/Errors.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/GenerateCgIPEStub.hs
- compiler/GHC/Driver/Hooks.hs
- compiler/GHC/Driver/LlvmConfigCache.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Driver/Make.hs
- + compiler/GHC/Driver/MakeAction.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/MakeSem.hs
- + compiler/GHC/Driver/Messager.hs
- compiler/GHC/Driver/Monad.hs
- compiler/GHC/Driver/Phases.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline.hs-boot
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Pipeline/LogQueue.hs
- compiler/GHC/Driver/Pipeline/Monad.hs
- compiler/GHC/Driver/Pipeline/Phases.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Driver/Session.hs
- + compiler/GHC/Driver/Session/Inspect.hs
- + compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs.hs
- compiler/GHC/Hs/Basic.hs
- 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/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Pat.hs-boot
- 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/Docs.hs
- compiler/GHC/HsToCore/Errors/Ppr.hs
- compiler/GHC/HsToCore/Errors/Types.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Foreign/C.hs
- compiler/GHC/HsToCore/Foreign/Call.hs
- compiler/GHC/HsToCore/Foreign/Decl.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.hs
- compiler/GHC/HsToCore/Foreign/Utils.hs
- compiler/GHC/HsToCore/Foreign/Wasm.hs
- compiler/GHC/HsToCore/GuardedRHSs.hs
- compiler/GHC/HsToCore/ListComp.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Pmc/Check.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Ppr.hs
- compiler/GHC/HsToCore/Pmc/Solver.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Pmc/Types.hs
- compiler/GHC/HsToCore/Pmc/Utils.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Decl.hs
- compiler/GHC/Iface/Env.hs
- compiler/GHC/Iface/Errors.hs
- compiler/GHC/Iface/Errors/Ppr.hs
- compiler/GHC/Iface/Errors/Types.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Binary.hs
- compiler/GHC/Iface/Ext/Debug.hs
- compiler/GHC/Iface/Ext/Types.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Flags.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Recomp/Binary.hs
- compiler/GHC/Iface/Recomp/Flags.hs
- compiler/GHC/Iface/Recomp/Types.hs
- compiler/GHC/Iface/Rename.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/Iface/Warnings.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/IfaceToCore.hs-boot
- compiler/GHC/JS/Ident.hs
- compiler/GHC/JS/JStg/Monad.hs
- compiler/GHC/JS/JStg/Syntax.hs
- compiler/GHC/JS/Make.hs
- compiler/GHC/JS/Optimizer.hs
- compiler/GHC/JS/Ppr.hs
- compiler/GHC/JS/Syntax.hs
- compiler/GHC/JS/Transform.hs
- + compiler/GHC/Linker/ByteCode.hs
- compiler/GHC/Linker/Config.hs
- compiler/GHC/Linker/Deps.hs
- compiler/GHC/Linker/Dynamic.hs
- + compiler/GHC/Linker/Executable.hs
- − compiler/GHC/Linker/ExtraObj.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Linker/MacOS.hs
- compiler/GHC/Linker/Static.hs
- compiler/GHC/Linker/Types.hs
- compiler/GHC/Linker/Unit.hs
- compiler/GHC/Linker/Windows.hs
- compiler/GHC/Llvm/MetaData.hs
- compiler/GHC/Llvm/Ppr.hs
- compiler/GHC/Llvm/Types.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/Errors/Basic.hs
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/Lexer/String.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Parser/String.hs
- compiler/GHC/Parser/Types.hs
- compiler/GHC/Platform.hs
- compiler/GHC/Platform/LoongArch64.hs → compiler/GHC/Platform/LA64.hs
- compiler/GHC/Platform/Reg.hs
- compiler/GHC/Platform/Reg/Class.hs
- compiler/GHC/Platform/Reg/Class/NoVectors.hs
- compiler/GHC/Platform/Reg/Class/Separate.hs
- compiler/GHC/Platform/Reg/Class/Unified.hs
- compiler/GHC/Platform/Regs.hs
- compiler/GHC/Plugins.hs
- compiler/GHC/Prelude/Basic.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/Expr.hs-boot
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Rename/Splice.hs-boot
- compiler/GHC/Rename/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Context.hs
- compiler/GHC/Runtime/Debugger.hs
- + compiler/GHC/Runtime/Debugger/Breakpoints.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Eval/Types.hs
- + compiler/GHC/Runtime/Eval/Utils.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Heap/Layout.hs
- compiler/GHC/Runtime/Interpreter.hs
- + compiler/GHC/Runtime/Interpreter/C.hs
- + compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Process.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Interpreter/Types/SymbolCache.hs
- compiler/GHC/Runtime/Interpreter/Wasm.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Settings.hs
- compiler/GHC/Settings/IO.hs
- compiler/GHC/Stg/BcPrep.hs
- compiler/GHC/Stg/CSE.hs
- compiler/GHC/Stg/Debug.hs
- + compiler/GHC/Stg/Debug/Types.hs
- compiler/GHC/Stg/EnforceEpt.hs
- compiler/GHC/Stg/EnforceEpt/Rewrite.hs
- compiler/GHC/Stg/EnforceEpt/TagSig.hs
- compiler/GHC/Stg/EnforceEpt/Types.hs
- compiler/GHC/Stg/FVs.hs
- compiler/GHC/Stg/Lift/Analysis.hs
- compiler/GHC/Stg/Lift/Monad.hs
- compiler/GHC/Stg/Lift/Types.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Syntax.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/Stg/Utils.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm.hs
- compiler/GHC/StgToCmm/ArgRep.hs
- compiler/GHC/StgToCmm/Bind.hs
- compiler/GHC/StgToCmm/CgUtils.hs
- compiler/GHC/StgToCmm/Closure.hs
- compiler/GHC/StgToCmm/Config.hs
- compiler/GHC/StgToCmm/DataCon.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/ExtCode.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/InfoTableProv.hs
- compiler/GHC/StgToCmm/Layout.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Monad.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToCmm/Utils.hs
- compiler/GHC/StgToJS/Apply.hs
- compiler/GHC/StgToJS/Arg.hs
- compiler/GHC/StgToJS/CodeGen.hs
- compiler/GHC/StgToJS/DataCon.hs
- compiler/GHC/StgToJS/Deps.hs
- compiler/GHC/StgToJS/Expr.hs
- compiler/GHC/StgToJS/ExprCtx.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Heap.hs
- compiler/GHC/StgToJS/Ids.hs
- compiler/GHC/StgToJS/Linker/Linker.hs
- compiler/GHC/StgToJS/Linker/Opt.hs
- compiler/GHC/StgToJS/Linker/Types.hs
- compiler/GHC/StgToJS/Linker/Utils.hs
- compiler/GHC/StgToJS/Literal.hs
- compiler/GHC/StgToJS/Monad.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/StgToJS/Regs.hs
- compiler/GHC/StgToJS/Rts/Rts.hs
- compiler/GHC/StgToJS/Rts/Types.hs
- compiler/GHC/StgToJS/Sinker/Collect.hs
- compiler/GHC/StgToJS/Sinker/Sinker.hs
- compiler/GHC/StgToJS/Sinker/StringsUnfloat.hs
- compiler/GHC/StgToJS/StaticPtr.hs
- compiler/GHC/StgToJS/Types.hs
- compiler/GHC/StgToJS/Utils.hs
- compiler/GHC/SysTools.hs
- compiler/GHC/SysTools/Ar.hs
- compiler/GHC/SysTools/BaseDir.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/GHC/SysTools/Process.hs
- compiler/GHC/SysTools/Tasks.hs
- compiler/GHC/SysTools/Terminal.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Functor.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Deriv/Infer.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Hole.hs
- compiler/GHC/Tc/Errors/Hole/FitTypes.hs
- compiler/GHC/Tc/Errors/Hole/Plugin.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Errors/Types/PromotionErr.hs
- compiler/GHC/Tc/Gen/Annotation.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Arrow.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/Do.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Expr.hs-boot
- compiler/GHC/Tc/Gen/Foreign.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Pat.hs
- − compiler/GHC/Tc/Gen/Rule.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Gen/Splice.hs-boot
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Instance/Typeable.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Plugin.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/Equality.hs
- + compiler/GHC/Tc/Solver/FunDeps.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Irred.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Solver/Rewrite.hs
- compiler/GHC/Tc/Solver/Solve.hs
- + compiler/GHC/Tc/Solver/Solve.hs-boot
- compiler/GHC/Tc/Solver/Types.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/BasicTypes.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/CtLoc.hs
- compiler/GHC/Tc/Types/ErrCtxt.hs
- − compiler/GHC/Tc/Types/EvTerm.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/LclEnv.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Types/TH.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/Concrete.hs
- compiler/GHC/Tc/Utils/Env.hs
- compiler/GHC/Tc/Utils/Instantiate.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- − compiler/GHC/Tc/Utils/TcMType.hs-boot
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Utils/Unify.hs-boot
- compiler/GHC/Tc/Validity.hs
- compiler/GHC/Tc/Zonk/Env.hs
- compiler/GHC/Tc/Zonk/Monad.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Annotations.hs
- + compiler/GHC/Types/Arity.hs
- compiler/GHC/Types/Avail.hs
- compiler/GHC/Types/Basic.hs
- − compiler/GHC/Types/Breakpoint.hs
- compiler/GHC/Types/CompleteMatch.hs
- compiler/GHC/Types/CostCentre.hs
- compiler/GHC/Types/CostCentre/State.hs
- compiler/GHC/Types/DefaultEnv.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Error.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/FieldLabel.hs
- compiler/GHC/Types/Fixity.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/ForeignStubs.hs
- compiler/GHC/Types/GREInfo.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/Id.hs
- compiler/GHC/Types/Id/Info.hs
- compiler/GHC/Types/Id/Make.hs
- + compiler/GHC/Types/InlinePragma.hs
- compiler/GHC/Types/Literal.hs
- compiler/GHC/Types/Name.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Occurrence.hs
- compiler/GHC/Types/Name/Ppr.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/Name/Set.hs
- compiler/GHC/Types/PkgQual.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/SaneDouble.hs
- compiler/GHC/Types/SourceError.hs
- compiler/GHC/Types/SourceText.hs
- compiler/GHC/Types/SptEntry.hs
- compiler/GHC/Types/SrcLoc.hs
- + compiler/GHC/Types/ThLevelIndex.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/TyThing.hs
- compiler/GHC/Types/TyThing/Ppr.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Types/Unique/DSM.hs
- compiler/GHC/Types/Unique/DSet.hs
- compiler/GHC/Types/Unique/FM.hs
- compiler/GHC/Types/Unique/Map.hs
- compiler/GHC/Types/Unique/SDFM.hs
- compiler/GHC/Types/Unique/Set.hs
- compiler/GHC/Types/Unique/Supply.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Types/Var.hs-boot
- compiler/GHC/Types/Var/Env.hs
- compiler/GHC/Unit.hs
- compiler/GHC/Unit/Env.hs
- compiler/GHC/Unit/External.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Finder/Types.hs
- compiler/GHC/Unit/Home/Graph.hs
- compiler/GHC/Unit/Home/ModInfo.hs
- compiler/GHC/Unit/Home/PackageTable.hs
- compiler/GHC/Unit/Info.hs
- compiler/GHC/Unit/Module.hs
- compiler/GHC/Unit/Module/Deps.hs
- − compiler/GHC/Unit/Module/External/Graph.hs
- compiler/GHC/Unit/Module/Graph.hs
- compiler/GHC/Unit/Module/Imported.hs
- compiler/GHC/Unit/Module/Location.hs
- compiler/GHC/Unit/Module/ModDetails.hs
- compiler/GHC/Unit/Module/ModGuts.hs
- compiler/GHC/Unit/Module/ModIface.hs
- compiler/GHC/Unit/Module/ModNodeKey.hs
- compiler/GHC/Unit/Module/ModSummary.hs
- + compiler/GHC/Unit/Module/Stage.hs
- compiler/GHC/Unit/Module/Status.hs
- compiler/GHC/Unit/Module/Warnings.hs
- compiler/GHC/Unit/Module/WholeCoreBindings.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Unit/Types.hs-boot
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Binary/Typeable.hs
- + compiler/GHC/Utils/EndoOS.hs
- compiler/GHC/Utils/Error.hs
- compiler/GHC/Utils/Exception.hs
- compiler/GHC/Utils/Json.hs
- compiler/GHC/Utils/Logger.hs
- compiler/GHC/Utils/Misc.hs
- compiler/GHC/Utils/Monad.hs
- compiler/GHC/Utils/Monad/Codensity.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/GHC/Utils/Panic.hs
- compiler/GHC/Utils/Panic/Plain.hs
- compiler/GHC/Utils/Ppr.hs
- compiler/GHC/Utils/Ppr/Colour.hs
- compiler/GHC/Utils/Trace.hs
- compiler/GHC/Wasm/ControlFlow.hs
- compiler/GHC/Wasm/ControlFlow/FromCmm.hs
- compiler/Language/Haskell/Syntax.hs
- compiler/Language/Haskell/Syntax/Basic.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- + compiler/Language/Haskell/Syntax/Binds/InlinePragma.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- + compiler/Language/Haskell/Syntax/Decls/Foreign.hs
- + compiler/Language/Haskell/Syntax/Decls/Overlap.hs
- compiler/Language/Haskell/Syntax/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/ImpExp/IsBoot.hs
- compiler/Language/Haskell/Syntax/Lit.hs
- compiler/Language/Haskell/Syntax/Module/Name.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Pat.hs-boot
- compiler/Language/Haskell/Syntax/Type.hs
- compiler/Setup.hs
- compiler/cbits/keepCAFsForGHCi.c
- compiler/ghc.cabal.in
- config.guess
- config.sub
- configure.ac
- distrib/configure.ac.in
- − docs/Makefile
- − docs/storage-mgt/Makefile
- docs/users_guide/9.14.1-notes.rst → docs/users_guide/9.16.1-notes.rst
- − docs/users_guide/Makefile
- docs/users_guide/bugs.rst
- docs/users_guide/compare-flags.py
- docs/users_guide/conf.py
- docs/users_guide/debug-info.rst
- docs/users_guide/debugging.rst
- + docs/users_guide/diagnostics-as-json-schema-1_2.json
- docs/users_guide/eventlog-formats.rst
- docs/users_guide/expected-undocumented-flags.txt
- docs/users_guide/extending_ghc.rst
- docs/users_guide/exts/arrows.rst
- docs/users_guide/exts/control.rst
- docs/users_guide/exts/data_kinds.rst
- docs/users_guide/exts/derive_any_class.rst
- docs/users_guide/exts/deriving_extra.rst
- docs/users_guide/exts/deriving_inferred.rst
- docs/users_guide/exts/deriving_strategies.rst
- docs/users_guide/exts/doandifthenelse.rst
- docs/users_guide/exts/explicit_namespaces.rst
- docs/users_guide/exts/ffi.rst
- docs/users_guide/exts/gadt.rst
- docs/users_guide/exts/gadt_syntax.rst
- docs/users_guide/exts/generics.rst
- docs/users_guide/exts/instances.rst
- docs/users_guide/exts/linear_types.rst
- docs/users_guide/exts/monad_comprehensions.rst
- docs/users_guide/exts/multiway_if.rst
- docs/users_guide/exts/named_defaults.rst
- docs/users_guide/exts/overloaded_labels.rst
- docs/users_guide/exts/overloaded_strings.rst
- docs/users_guide/exts/parallel_list_comprehensions.rst
- docs/users_guide/exts/pattern_synonyms.rst
- docs/users_guide/exts/poly_kinds.rst
- docs/users_guide/exts/pragmas.rst
- docs/users_guide/exts/primitives.rst
- docs/users_guide/exts/rank_polymorphism.rst
- docs/users_guide/exts/rebindable_syntax.rst
- + docs/users_guide/exts/relaxed_poly_rec.rst
- docs/users_guide/exts/required_type_arguments.rst
- docs/users_guide/exts/roles.rst
- docs/users_guide/exts/scoped_type_variables.rst
- docs/users_guide/exts/standalone_deriving.rst
- docs/users_guide/exts/strict.rst
- docs/users_guide/exts/table.rst
- docs/users_guide/exts/template_haskell.rst
- docs/users_guide/exts/tuple_sections.rst
- docs/users_guide/exts/type_data.rst
- docs/users_guide/exts/type_defaulting.rst
- docs/users_guide/exts/type_families.rst
- docs/users_guide/exts/types.rst
- docs/users_guide/flags.py
- docs/users_guide/ghci.rst
- docs/users_guide/gone_wrong.rst
- docs/users_guide/hints.rst
- docs/users_guide/index.rst
- docs/users_guide/javascript.rst
- docs/users_guide/packages.rst
- docs/users_guide/phases.rst
- docs/users_guide/profiling.rst
- docs/users_guide/release-notes.rst
- docs/users_guide/rtd-theme/layout.html
- docs/users_guide/runtime_control.rst
- docs/users_guide/separate_compilation.rst
- docs/users_guide/using-concurrent.rst
- docs/users_guide/using-optimisation.rst
- docs/users_guide/using-warnings.rst
- docs/users_guide/using.rst
- docs/users_guide/wasm.rst
- docs/users_guide/win32-dlls.rst
- − driver/Makefile
- − driver/ghc/Makefile
- − driver/ghci/Makefile
- driver/ghci/ghci.c
- − driver/haddock/Makefile
- driver/utils/cwrapper.c
- driver/utils/isMinTTY.c
- − driver/utils/merge_sections.ld
- − driver/utils/merge_sections_pe.ld
- + ghc/GHC/Driver/Session/Lint.hs
- + ghc/GHC/Driver/Session/Mode.hs
- ghc/GHCi/Leak.hs
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Exception.hs
- ghc/GHCi/UI/Info.hs
- ghc/GHCi/UI/Monad.hs
- ghc/GHCi/UI/Print.hs
- ghc/Main.hs
- − ghc/Makefile
- ghc/ghc-bin.cabal.in
- hadrian/README.md
- hadrian/bindist/Makefile
- hadrian/bindist/config.mk.in
- hadrian/bindist/cwrappers/cwrapper.c
- hadrian/bootstrap/generate_bootstrap_plans
- hadrian/bootstrap/hadrian-bootstrap-gen.cabal
- hadrian/bootstrap/plan-9_10_1.json
- hadrian/bootstrap/plan-9_6_5.json → hadrian/bootstrap/plan-9_10_2.json
- hadrian/bootstrap/plan-9_6_6.json → hadrian/bootstrap/plan-9_12_1.json
- hadrian/bootstrap/plan-9_6_4.json → hadrian/bootstrap/plan-9_12_2.json
- − hadrian/bootstrap/plan-9_6_1.json
- − hadrian/bootstrap/plan-9_6_2.json
- − hadrian/bootstrap/plan-9_6_3.json
- − hadrian/bootstrap/plan-9_8_1.json
- − hadrian/bootstrap/plan-9_8_2.json
- hadrian/bootstrap/plan-bootstrap-9_10_1.json
- hadrian/bootstrap/plan-bootstrap-9_6_5.json → hadrian/bootstrap/plan-bootstrap-9_10_2.json
- hadrian/bootstrap/plan-bootstrap-9_6_6.json → hadrian/bootstrap/plan-bootstrap-9_12_1.json
- hadrian/bootstrap/plan-bootstrap-9_8_1.json → hadrian/bootstrap/plan-bootstrap-9_12_2.json
- − hadrian/bootstrap/plan-bootstrap-9_6_1.json
- − hadrian/bootstrap/plan-bootstrap-9_6_2.json
- − hadrian/bootstrap/plan-bootstrap-9_6_3.json
- − hadrian/bootstrap/plan-bootstrap-9_6_4.json
- − hadrian/bootstrap/plan-bootstrap-9_8_2.json
- hadrian/bootstrap/src/Main.hs
- hadrian/cabal.project
- hadrian/cfg/default.host.target.in
- hadrian/cfg/default.target.in
- hadrian/cfg/system.config.in
- hadrian/doc/flavours.md
- hadrian/doc/user-settings.md
- hadrian/hadrian.cabal
- hadrian/src/Base.hs
- hadrian/src/Builder.hs
- hadrian/src/CommandLine.hs
- hadrian/src/Context.hs
- hadrian/src/Context/Path.hs
- hadrian/src/Flavour.hs
- hadrian/src/Flavour/Type.hs
- hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
- hadrian/src/Hadrian/Haskell/Cabal/Type.hs
- hadrian/src/Hadrian/Haskell/Hash.hs
- hadrian/src/Hadrian/Oracles/ArgsHash.hs
- hadrian/src/Hadrian/Oracles/Cabal/Type.hs
- hadrian/src/Hadrian/Oracles/DirectoryContents.hs
- hadrian/src/Hadrian/Oracles/Path.hs
- hadrian/src/Hadrian/Oracles/TextFile.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Oracles/Flavour.hs
- hadrian/src/Oracles/ModuleFiles.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Oracles/TestSettings.hs
- hadrian/src/Packages.hs
- hadrian/src/Rules.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/CabalReinstall.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Docspec.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Gmp.hs
- − hadrian/src/Rules/Libffi.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Lint.hs
- hadrian/src/Rules/Program.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Rules/SourceDist.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Rules/ToolArgs.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cabal.hs
- hadrian/src/Settings/Builders/Cc.hs
- hadrian/src/Settings/Builders/Common.hs
- hadrian/src/Settings/Builders/Configure.hs
- hadrian/src/Settings/Builders/DeriveConstants.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/Hsc2Hs.hs
- hadrian/src/Settings/Builders/Make.hs
- − hadrian/src/Settings/Builders/MergeObjects.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Builders/SplitSections.hs
- hadrian/src/Settings/Default.hs
- hadrian/src/Settings/Flavours/Benchmark.hs
- hadrian/src/Settings/Flavours/Development.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Performance.hs
- hadrian/src/Settings/Flavours/Quick.hs
- hadrian/src/Settings/Flavours/QuickCross.hs
- hadrian/src/Settings/Flavours/Quickest.hs
- hadrian/src/Settings/Flavours/Release.hs
- hadrian/src/Settings/Flavours/Validate.hs
- hadrian/src/Settings/Packages.hs
- hadrian/src/Settings/Program.hs
- hadrian/src/Settings/Warnings.hs
- hadrian/stack.yaml
- hadrian/stack.yaml.lock
- − libffi-tarballs
- libraries/Cabal
- − libraries/Makefile
- libraries/Win32
- libraries/array
- libraries/base/base.cabal.in
- libraries/base/changelog.md
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Concurrent.hs
- libraries/base/src/Control/Exception.hs
- libraries/base/src/Control/Monad.hs
- libraries/base/src/Data/Array/Byte.hs
- libraries/base/src/Data/Bifoldable1.hs
- libraries/base/src/Data/Bifunctor.hs
- libraries/base/src/Data/Bool.hs
- libraries/base/src/Data/Fixed.hs
- libraries/base/src/Data/Ix.hs
- libraries/base/src/Data/List.hs
- libraries/base/src/Data/List/NonEmpty.hs
- + libraries/base/src/Data/List/NubOrdSet.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/Conc.hs
- libraries/base/src/GHC/Conc/Sync.hs
- − libraries/base/src/GHC/Desugar.hs
- − libraries/base/src/GHC/ExecutionStack/Internal.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Generics.hs
- − libraries/base/src/GHC/IOPort.hs
- − libraries/base/src/GHC/JS/Prim/Internal/Build.hs
- libraries/base/src/GHC/Num.hs
- − libraries/base/src/GHC/Num/BigNat.hs
- − libraries/base/src/GHC/Num/Integer.hs
- − libraries/base/src/GHC/Num/Natural.hs
- libraries/base/src/GHC/RTS/Flags.hs
- libraries/base/src/GHC/Records.hs
- libraries/base/src/GHC/Stack/CloneStack.hs
- libraries/base/src/GHC/Stats.hs
- − libraries/base/src/GHC/TypeLits/Internal.hs
- − libraries/base/src/GHC/TypeNats/Internal.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- libraries/base/src/System/CPUTime/Utils.hs
- libraries/base/src/System/CPUTime/Windows.hsc
- libraries/base/src/System/Console/GetOpt.hs
- libraries/base/src/System/IO.hs
- + libraries/base/src/System/IO/OS.hs
- libraries/base/src/System/Timeout.hs
- libraries/base/tests/IO/Makefile
- libraries/base/tests/IO/T12010/cbits/initWinSock.c
- libraries/base/tests/IO/all.T
- + libraries/base/tests/IO/osHandles001FileDescriptors.hs
- + libraries/base/tests/IO/osHandles001FileDescriptors.stdout
- + libraries/base/tests/IO/osHandles001WindowsHandles.hs
- + libraries/base/tests/IO/osHandles001WindowsHandles.stdout
- + libraries/base/tests/IO/osHandles002FileDescriptors.hs
- + libraries/base/tests/IO/osHandles002FileDescriptors.stderr
- + libraries/base/tests/IO/osHandles002FileDescriptors.stdin
- + libraries/base/tests/IO/osHandles002FileDescriptors.stdout
- + libraries/base/tests/IO/osHandles002WindowsHandles.hs
- + libraries/base/tests/IO/osHandles002WindowsHandles.stderr
- + libraries/base/tests/IO/osHandles002WindowsHandles.stdin
- + libraries/base/tests/IO/osHandles002WindowsHandles.stdout
- libraries/base/tests/IO/withBinaryFile002.stderr
- libraries/base/tests/IO/withFile002.stderr
- libraries/base/tests/IO/withFileBlocking002.stderr
- libraries/base/tests/T23454.stderr
- libraries/base/tests/all.T
- libraries/base/tests/perf/Makefile
- libraries/base/tests/perf/encodingAllocations.hs
- libraries/base/tests/unicode002.stdout
- libraries/base/tests/unicode003.stdout
- libraries/binary
- libraries/containers
- libraries/deepseq
- libraries/directory
- libraries/exceptions
- libraries/filepath
- libraries/ghc-bignum/changelog.md
- libraries/ghc-bignum/ghc-bignum.cabal
- + libraries/ghc-boot-th/GHC/Boot/TH/Monad.hs
- libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
- libraries/ghc-boot-th/ghc-boot-th.cabal.in
- libraries/ghc-boot/GHC/Settings/Utils.hs
- libraries/ghc-boot/GHC/Unit/Database.hs
- libraries/ghc-boot/Setup.hs
- libraries/ghc-boot/ghc-boot.cabal.in
- libraries/ghc-compact/GHC/Compact.hs
- libraries/ghc-compact/GHC/Compact/Serialized.hs
- libraries/ghc-compact/ghc-compact.cabal
- libraries/ghc-compact/tests/all.T
- libraries/ghc-experimental/CHANGELOG.md
- libraries/ghc-experimental/ghc-experimental.cabal.in
- + libraries/ghc-experimental/src/GHC/Exception/Backtrace/Experimental.hs
- + libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs
- libraries/ghc-experimental/src/GHC/TypeNats/Experimental.hs
- + libraries/ghc-experimental/src/System/Mem/Experimental.hs
- libraries/ghc-heap/GHC/Exts/Heap.hs
- libraries/ghc-heap/GHC/Exts/Heap/ClosureTypes.hs
- libraries/ghc-heap/GHC/Exts/Heap/Closures.hs
- + libraries/ghc-heap/GHC/Exts/Heap/Constants.hs
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
- + libraries/ghc-heap/GHC/Exts/Heap/InfoTable.hs
- + libraries/ghc-heap/GHC/Exts/Heap/InfoTable/Types.hs
- + libraries/ghc-heap/GHC/Exts/Heap/InfoTableProf.hs
- libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/Types.hs
- libraries/ghc-heap/GHC/Exts/Heap/Utils.hsc
- libraries/ghc-heap/GHC/Exts/Stack.hs
- + libraries/ghc-heap/GHC/Exts/Stack/Constants.hs
- libraries/ghc-heap/GHC/Exts/Stack/Decode.hs
- libraries/ghc-heap/ghc-heap.cabal.in
- libraries/ghc-heap/tests/parse_tso_flags.hs
- libraries/ghc-heap/cbits/HeapPrim.cmm → libraries/ghc-internal/cbits/HeapPrim.cmm
- + libraries/ghc-internal/cbits/RtsIface.c
- libraries/ghc-heap/cbits/Stack.cmm → libraries/ghc-internal/cbits/Stack.cmm
- libraries/ghc-internal/cbits/StackCloningDecoding.cmm
- libraries/ghc-heap/cbits/Stack_c.c → libraries/ghc-internal/cbits/Stack_c.c
- − libraries/ghc-internal/cbits/atomic.c
- libraries/ghc-internal/cbits/consUtils.c
- − libraries/ghc-internal/cbits/mulIntMayOflo.c
- libraries/ghc-internal/codepages/MakeTable.hs
- libraries/ghc-internal/codepages/Makefile
- libraries/ghc-internal/configure.ac
- libraries/ghc-internal/ghc-internal.buildinfo.in
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/include/HsIntegerGmp.h.in
- + libraries/ghc-internal/include/RtsIfaceSymbols.h
- libraries/ghc-internal/jsbits/base.js
- libraries/ghc-internal/jsbits/errno.js
- + libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
- libraries/ghc-internal/src/GHC/Internal/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs
- libraries/ghc-internal/src/GHC/Internal/CString.hs
- libraries/ghc-internal/src/GHC/Internal/Classes.hs
- + libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs
- libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/POSIX.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Conc/Windows.hs
- libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
- libraries/ghc-internal/src/GHC/Internal/Control/Monad.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fail.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Function.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Ix.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
- libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Typeable/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
- libraries/ghc-internal/src/GHC/Internal/Err.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Exts.hs
- libraries/ghc-internal/src/GHC/Internal/Float.hs
- libraries/ghc-internal/src/GHC/Internal/Functor/ZipList.hs
- + libraries/ghc-internal/src/GHC/Internal/Heap/Closures.hs
- libraries/ghc-heap/GHC/Exts/Heap/Constants.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/Constants.hsc
- libraries/ghc-heap/GHC/Exts/Heap/InfoTable.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable.hsc
- libraries/ghc-heap/GHC/Exts/Heap/InfoTable/Types.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable/Types.hsc
- libraries/ghc-heap/GHC/Exts/Heap/InfoTableProf.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTableProf.hsc
- + libraries/ghc-internal/src/GHC/Internal/Heap/ProfInfo/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO.hs-boot
- libraries/ghc-internal/src/GHC/Internal/IO/Buffer.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs-boot
- libraries/ghc-internal/src/GHC/Internal/IO/FD.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
- − libraries/ghc-internal/src/GHC/Internal/IOPort.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Foreign/Callback.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Prim.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal/Build.hs
- libraries/ghc-internal/src/GHC/Internal/LanguageExtensions.hs
- libraries/ghc-internal/src/GHC/Internal/List.hs
- libraries/ghc-internal/src/GHC/Internal/Magic.hs
- libraries/ghc-internal/src/GHC/Internal/Numeric.hs
- libraries/ghc-internal/src/GHC/Internal/Prim/PtrEq.hs
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
- libraries/ghc-internal/src/GHC/Internal/Real.hs
- libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs
- + libraries/ghc-internal/src/GHC/Internal/STM.hs
- + libraries/ghc-internal/src/GHC/Internal/Stack/Annotation.hs
- libraries/ghc-internal/src/GHC/Internal/Stack/CloneStack.hs
- libraries/ghc-heap/GHC/Exts/Stack/Constants.hsc → libraries/ghc-internal/src/GHC/Internal/Stack/Constants.hsc
- + libraries/ghc-internal/src/GHC/Internal/Stack/ConstantsProf.hsc
- + libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
- libraries/ghc-internal/src/GHC/Internal/System/Environment/ExecutablePath.hsc
- libraries/ghc-internal/src/GHC/Internal/System/IO.hs
- + libraries/ghc-internal/src/GHC/Internal/System/IO/OS.hs
- libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs
- + libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs
- libraries/ghc-internal/src/GHC/Internal/Tuple.hs
- libraries/ghc-internal/src/GHC/Internal/Type/Reflection.hs
- libraries/ghc-internal/src/GHC/Internal/TypeError.hs
- libraries/ghc-internal/src/GHC/Internal/TypeLits.hs
- libraries/ghc-internal/src/GHC/Internal/TypeNats.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/DerivedCoreProperties.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/GeneralCategory.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleLowerCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleTitleCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleUpperCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Version.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Exports.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Imports.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Types.hs
- + libraries/ghc-internal/tests/Makefile
- testsuite/tests/ghc-api/settings-escape/ghc-install-folder/lib/.gitkeep → libraries/ghc-internal/tests/all.T
- + libraries/ghc-internal/tests/backtraces/Makefile
- + libraries/ghc-internal/tests/backtraces/T14532a.hs
- + libraries/ghc-internal/tests/backtraces/T14532a.stdout
- + libraries/ghc-internal/tests/backtraces/T14532b.hs
- + libraries/ghc-internal/tests/backtraces/T14532b.stdout
- + libraries/ghc-internal/tests/backtraces/T15395.hs
- + libraries/ghc-internal/tests/backtraces/T15395.stdout
- + libraries/ghc-internal/tests/backtraces/T26507.hs
- + libraries/ghc-internal/tests/backtraces/T26507.stderr
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- rts/include/rts/NonMoving.h
- rts/include/rts/OSThreads.h
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- rts/include/rts/StablePtr.h
- rts/include/rts/Types.h
- rts/include/rts/ghc_ffi.h
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- rts/include/stg/Prim.h
- rts/include/stg/SMP.h
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- libraries/ghc-internal/cbits/popcnt.c → rts/prim/popcnt.c
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- rts/sm/Evac.c
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- rts/wasm/JSFFI.c
- rts/wasm/blocker.cmm
- rts/wasm/scheduler.cmm
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- rts/win32/veh_excn.c
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- + utils/haddock/doc/snippets/Snippet-List-Definition.html
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- + utils/haddock/doc/snippets/Snippet-List-Enumerated.html
- + utils/haddock/doc/snippets/Snippet-List-Enumerated.tex
- + utils/haddock/doc/snippets/Snippet-List-Indentation.html
- + utils/haddock/doc/snippets/Snippet-List-Indentation.tex
- + utils/haddock/doc/snippets/Snippet-List-Multiline-Item.html
- + utils/haddock/doc/snippets/Snippet-List-Multiline-Item.tex
- + utils/haddock/doc/snippets/Snippet-List-Nested-Item.html
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- + utils/haddock/doc/snippets/Snippet-List-Not-Newline.html
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- + utils/haddock/doc/snippets/Snippet-List-Not-Separated.html
- + utils/haddock/doc/snippets/Snippet-List-Not-Separated.tex
- utils/haddock/haddock-api/haddock-api.cabal
- utils/haddock/haddock-api/resources/html/Linuwial.std-theme/linuwial.css
- − utils/haddock/haddock-api/src/Haddock/Backends/HaddockDB.hs
- 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/Hyperlinker/Renderer.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Utils.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/Layout.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Names.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Themes.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Utils.hs
- utils/haddock/haddock-api/src/Haddock/Convert.hs
- utils/haddock/haddock-api/src/Haddock/Doc.hs
- utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
- utils/haddock/haddock-api/src/Haddock/Interface.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/LexParseRn.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/Types.hs
- utils/haddock/haddock-api/src/Haddock/Utils.hs
- utils/haddock/haddock-library/haddock-library.cabal
- utils/haddock/haddock-library/src/Documentation/Haddock/Parser.hs
- utils/haddock/haddock-library/test/Documentation/Haddock/ParserSpec.hs
- utils/haddock/haddock-test/haddock-test.cabal
- utils/haddock/haddock-test/src/Test/Haddock.hs
- 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/Bug1050.html
- utils/haddock/html-test/ref/Bug1103.html
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- utils/haddock/html-test/ref/Bug26.html
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- utils/haddock/html-test/ref/Bug298.html
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- utils/haddock/html-test/ref/Bug548.html
- utils/haddock/html-test/ref/Bug85.html
- utils/haddock/html-test/ref/Bug923.html
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- utils/haddock/html-test/ref/BundledPatterns2.html
- utils/haddock/html-test/ref/ConstructorPatternExport.html
- utils/haddock/html-test/ref/FunArgs.html
- utils/haddock/html-test/ref/GADTRecords.html
- utils/haddock/html-test/ref/Hash.html
- utils/haddock/html-test/ref/ImplicitParams.html
- utils/haddock/html-test/ref/Instances.html
- utils/haddock/html-test/ref/LinearTypes.html
- utils/haddock/html-test/ref/Nesting.html
- utils/haddock/html-test/ref/PatternSyns.html
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- utils/haddock/html-test/ref/PromotedTypes.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/TitledPicture.html
- utils/haddock/html-test/ref/TypeFamilies3.html
- utils/haddock/html-test/ref/TypeOperators.html
- utils/haddock/html-test/ref/Unicode.html
- utils/haddock/html-test/ref/Unicode2.html
- + utils/haddock/html-test/src/Bug25739.hs
- + utils/haddock/html-test/src/Bug26246.hs
- utils/haddock/html-test/src/LinearTypes.hs
- + utils/haddock/html-test/src/PatternSyns2.hs
- + utils/haddock/html-test/src/RedactTypeSynonyms.hs
- utils/haddock/html-test/src/TypeOperators.hs
- utils/haddock/hypsrc-test/Main.hs
- utils/haddock/hypsrc-test/ref/src/Bug1091.html
- utils/haddock/hypsrc-test/ref/src/CPP.html
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- utils/haddock/hypsrc-test/ref/src/Constructors.html
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- utils/haddock/hypsrc-test/ref/src/Literals.html
- utils/haddock/hypsrc-test/ref/src/Operators.html
- utils/haddock/hypsrc-test/ref/src/Polymorphism.html
- utils/haddock/hypsrc-test/ref/src/PositionPragmas.html
- utils/haddock/hypsrc-test/ref/src/Quasiquoter.html
- utils/haddock/hypsrc-test/ref/src/Records.html
- utils/haddock/hypsrc-test/ref/src/TemplateHaskellQuasiquotes.html
- utils/haddock/hypsrc-test/ref/src/TemplateHaskellSplices.html
- utils/haddock/hypsrc-test/ref/src/Types.html
- utils/haddock/hypsrc-test/ref/src/UsingQuasiquotes.html
- utils/haddock/latex-test/ref/LinearTypes/LinearTypes.tex
- + utils/haddock/latex-test/ref/RedactTypeSynonyms/RedactTypeSynonyms.tex
- utils/haddock/latex-test/src/LinearTypes/LinearTypes.hs
- + utils/haddock/latex-test/src/RedactTypeSynonyms/RedactTypeSynonyms.hs
- utils/hpc
- utils/hsc2hs
- − utils/iserv/cbits/iservmain.c
- − utils/iserv/iserv.cabal.in
- − utils/iserv/src/Main.hs
- utils/jsffi/dyld.mjs
- utils/jsffi/post-link.mjs
- utils/jsffi/prelude.mjs
- utils/llvm-targets/gen-data-layout.sh

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/0ec359aab6ce26e45bdf522a307627c...

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[Git][ghc/ghc][wip/andreask/bump_nofib] 1032 commits: Fix buglet in isEmptyWorkList

Andreas Klebinger (＠AndreasK)