[Git][ghc/ghc][wip/supersven/libdw-test] 1253 commits: Flip the order of arguments of setField (#24668)

24 Feb 2026

      Sven Tennie pushed to branch wip/supersven/libdw-test at Glasgow Haskell Compiler / GHC

Commits:
1f67ad21 by Andrei Borzenkov at 2024-12-25T01:42:31-05:00
Flip the order of arguments of setField (#24668)

GHC Proposal 583 "HasField redesign" specifies the
following order of a setField function arguments as this:

  setField :: forall fld a b. SetField fld a b. b -> a -> a

This patch flips the application order to match the spec.

- - - - -
3e0c948d by Ben Gamari at 2024-12-25T01:43:08-05:00
rel-eng/upload: Add set_symlink mode

This slightly eases updating of the `latest` symlinks.

- - - - -
63d63f9d by Simon Peyton Jones at 2024-12-25T01:43:45-05:00
Preserve orientation when unifying kinds

This MR fixes yet another manifestation of the trickiness caused
by Note [Fundeps with instances, and equality orientation].

I wish there was a more robust way to do this, but this fix is
a definite improvement.

Fixes #25597

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94ba9a6a by ARATA Mizuki at 2024-12-26T10:47:57-05:00
x86 NCG SIMD: Support pack/insert/broadcast/unpack of 128-bit integer vectors

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6bf0d587 by Andrew Lelechenko at 2024-12-26T10:48:33-05:00
docs: fix haddock formatting in Control.Monad.Fix

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feb14af1 by Sergey Vinokurov at 2024-12-27T15:06:28+00:00
Remove unnecessary irrefutable patterns from NonEmpty functions

Implementation of https://github.com/haskell/core-libraries-committee/issues/107

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6a0d91b4 by Sergey Vinokurov at 2024-12-27T15:06:28+00:00
Make cons, Semigroup, IsList, and Monad instances stricter

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1249e597 by Sergey Vinokurov at 2024-12-27T15:06:28+00:00
Restore some laziness in <| and Semigroup instance, improve Monad instance

The Monad instance shouldn't produce the outer :| unless f a reduces
to WHNF. (Notice that the b :| bs match is implicitly lazy.)

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8699d826 by Sergey Vinokurov at 2024-12-27T15:12:30+00:00
Add comment outlining Data.List.NonEmpty implementation guiding principles

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7febe00e by Sergey Vinokurov at 2024-12-27T22:24:43+00:00
Fix tests since location of ‘>>=’ changed

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a928c326 by ARATA Mizuki at 2024-12-28T03:06:14-05:00
Fix LLVM version detection

With a recent LLVM, `llc -version` emits the version on the first line
if the vendor is set.  It emits the version on the second line
otherwise.

Therefore, we need to check the both lines to detect the version.

GHC now emits a warning if it fails to detect the LLVM version,
so we can notice if the output of `llc -version` changes in the future.

Also, the warning for using LLVM < 10 on s390x is removed, because
we assume LLVM >= 13 now.

This fixes the definition of __GLASGOW_HASKELL_LLVM__ macro.

Fixes #25606

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7f79257a by Zubin Duggal at 2024-12-29T13:04:35+00:00
Bump base, ghc-prim and template-haskell versions for 9.12

Also bump various submodules.

(cherry picked from commit 6fc1fa3bdc8f53acdb19e47145789274060e498f)

Bump base bound to 4.21 for GHC 9.12

(cherry picked from commit 473a201c6b55aea5bf9c9db0836a66ea1b657e04)

Bump binary submodule to 0.8.9.2

(cherry picked from commit 7199869a52ab45e8856658248bf807954d58cc20)
(cherry picked from commit ec2f40b45c1a3d82d17a2fc07e9ddb9218bc3940)

Bump exceptions submodule to 0.10.9

(cherry picked from commit f5b5d1dc2d326368e5b173d622630d77f019b629)

Bump file-io submodule to 0.1.4

(cherry picked from commit ba786681de6ac5fa49938e2cd71a5988f0f40d1f)

bump os-string submodule to 2.0.6

(cherry picked from commit 3a7ffdbb832c045a55fd1ef24f546abdd9d9e30f)

bump transformers submodule to 0.6.1.2

(cherry picked from commit 53b46fd437421b9e5a001edc6d1c427439d7714f)

Bump directory submodule to v1.3.9.0

(cherry picked from commit 27dc2664c5404bb462092bb216c2c37b418fd1f8)

Bump Win32 submodule to v2.14.1.0

(cherry picked from commit 80df88086180f5e39212b2feacf70a9d2b263c6c)

Bump filepath submodule to 1.5.3.0

(cherry picked from commit 29bfae2c58a7303a081a6e7956b9f55e5faf3eeb)

Bump file-io submodule to avoid usage of QuasiQuotes

(cherry picked from commit 97b0dff223a6c4cc003adec448104c277f214645)

Bump unix submodule to 2.8.6.0

(cherry picked from commit a1f56d6d6a99c100f88ef0a8b4d51298cf24a42d)

Bump os-string submodule to 2.0.8

(cherry picked from commit 0121b76fd52ea0c0ce5d07085bc195666b63c625)

Bump file-io submodule to avoid usage of QuasiQuotes

(cherry picked from commit 962ceb50c8a6fc370e1c0a267f5cd5562a8cf759)

Bump filepath submodule to 1.5.4.0

(cherry picked from commit 7bc6877fd5d41c6d5900678ad5e73ed30f366569)

Bump file-io submodule to 0.1.5

(cherry picked from commit 9478b5aefe2877d58baf527edcf936dddbb955b7)

Bump Cabal submodule to 3.14.1.0

(cherry picked from commit 5c9c3e3f79a79bb6d9a77a17c716dc3a0bcbd2aa)

Bump directory submodule to 0.12.2.0

(cherry picked from commit 897906265db37af34ae2aaa016cec417f263407b)

Bump array submodule for base bump

Bump stm submodule for base bump

Bump process submodule for base bump

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f6079408 by Zubin Duggal at 2024-12-29T13:04:35+00:00
Fix ghc-e005 after HasCallstack changes

(cherry picked from commit 77f340a24561cea8a6f2ada296b3ea356ab1823c)

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3e10fa75 by Zubin Duggal at 2024-12-29T13:04:35+00:00
Add haskeline to stage0Packages

Otherwise we link against boot inplace and boot unix as boot haskeline
depends on boot unix.

(cherry picked from commit 90b493769ebdf3cd7be404d18462dc20ac1044df)

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4ad6aec4 by Zubin Duggal at 2024-12-29T13:04:35+00:00
Fix TH changelog

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ea3f7fd5 by Zubin Duggal at 2024-12-29T13:04:35+00:00
release: copy index.html from correct directory

(cherry picked from commit cbfd0829cd61928976c9eb17ba4af18272466063)

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fafb70db by Zubin Duggal at 2024-12-29T13:04:35+00:00
hadrian-multi: warn on unused imports

os-string has redundant imports

(cherry picked from commit dde3796be689ea57543936e22aa5ea4ef7ed995e)

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c02b1e46 by Simon Peyton Jones at 2024-12-29T17:04:30-05:00
Fix in-scope set for CSE

Ticket #25468 showed an assertion failure in CSE because a top-level
Id was being used before it was defined.  Reason: Note [Glomming] in
GHC.Core.Opt.OccurAnal.

Solution (used in many places): just put all the top-level bindings in
scope at the beginning of CSE.

Compile-time allocation wobbles up and down a tiny bit; geo mean is
zero. But MultiLayerModulesTH_OneShot and hard_hole_fits increase (on
some architectures only) by a bit oever 2% .  I think these are just a
random fluctuations.

Metric Increase:
    MultiLayerModulesTH_OneShot
    hard_hole_fits

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559d4f84 by Krzysztof Gogolewski at 2024-12-30T11:53:19-05:00
Add tests for #23883

The issue has been fixed by commit f5d3e03c56ffc63.
Only T23883a is the actual regression test, the remaining ones are
tricky cases found during development of an independent fix !11313.

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278a53ee by Sergey Vinokurov at 2024-12-30T11:53:59-05:00
Update changelog for CLC proposal #107 (NonEmpty laziness)

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f56558be by Matthew Pickering at 2025-01-07T13:53:03-05:00
warnings: Find out if a qualified name is in the interactive scope directly

There were two ad-hoc mechanisms used to determine which modules were in
the interactive scope.

1. Look at everything in the GRE, to see what is imported qualified.
2. Look at the last loaded module in the HPT.

(1) Is very inefficient, GlobalRdrEnvs can be very big.
(2) is incorrect, there is no reason to assume the "last" thing added to
the HPT has any relevance to module loading order.

Happily, the same checks can be implemented directly by looking at the
interactive imports from the interactive context. This mirrors what
happens for normal imports.

Arguably, the error reporting code shouldn't be doing this kind of
processing and it should be an option is set when rendering the error
message. However, this just improves the situation and doesn't block
progress on that front in future.

See #14225 and #15611

Fixes #25600

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84155cdb by Simon Peyton Jones at 2025-01-07T13:53:40-05:00
Tidy up kcConDecls

Addresses #25630

In particular,

* Introduce ConArgKind and use it.

* Make kcConDecls and tcConDecls work the same way
  concerning the kind of argument types

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6c12b6cf by Bryan Richter at 2025-01-07T18:15:02-05:00
Remove tmp files after toolchain check

Fixes #25620

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42826a89 by Cheng Shao at 2025-01-07T18:15:39-05:00
xxhash: bump to v0.8.3

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185f17e4 by sheaf at 2025-01-07T18:16:15-05:00
Fix typo in GHC.Tc.Solver.Solve.runTcPluginsWanted
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23099752 by Luite Stegeman at 2025-01-08T00:33:33+01:00
Add flags for switching off speculative evaluation.

We found that speculative evaluation can increase the amount of
allocations in some circumstances. This patch adds new flags for
selectively disabling speculative evaluation, allowing us to
test the effect of the optimization.

The new flags are:

  -fspec-eval
     globally enable speculative evaluation

  -fspec-eval-dictfun
     enable speculative evaluation for dictionary functions (no effect
     if speculative evaluation is globally disabled)

The new flags are on by default for all optimisation levels.

See #25284

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0161badc by Ben Gamari at 2025-01-09T17:30:05-05:00
rts/printClosure: Print IPE information for thunks and functions

This makes it considerably easier to grok the structure of the heap
when IPE information is available.

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023f36f5 by Rodrigo Mesquita at 2025-01-10T14:57:48-05:00
user_guide: Note -pgmP/-optP are for /Haskell/-CPP

Fixes #25574

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e1c133f2 by Ben Gamari at 2025-01-10T14:58:25-05:00
dump-decls: Suppress unit-ids

While the testsuite driver already normalizes these away, they are
nevertheless a severe nuisance when diffing outside of the testsuite.

Intriguingly, this doesn't completely eliminate the unit IDs; some
wired-in names are still printed. However, this is a cheap and helpful
improvement over the status quo so I am simply going to accept this.

Fixes #25334.

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2e7bf446 by sheaf at 2025-01-13T10:55:26+01:00
Remove SDocs from ErrCtxt & ErrInfo

This commit:

  - turns the SDoc used in ErrCtxt into a proper error datatype,
    ErrCtxtMsg, which contains all the different error contexts that
    can be added,

  - replaces ErrInfo with [ErrCtxt].
    ErrInfo used to contain two SDocs; the first is replaced with [ErrCtxt],
    and the second is removed, with the relevant information being put
    in the appropriate error message constructors.

Fixes #23436

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2d62b970 by Mike Pilgrem at 2025-01-13T12:59:10-05:00
Re CLC #300 - Specify fmap for NonEmpty as map

See:
* https://github.com/haskell/core-libraries-committee/issues/300

Seeks to:
* move existing instances for NonEmpty (except of Eq and Ord) out of GHC.Internal.Base into new GHC.Internal.Data.NonEmpty (to avoid otherwise unavoidable cycles in the module graph);
* move map out of Data.List.NonEmpty (base package) into GHC.Internal.Data.NonEmpty;
* define fmap as map for NonEmpty instance of Functor, avoiding code duplication;
* re-export map from existing GHC.Internal.Data.List.NonEmpty; and
* re-export map from Data.List.NonEmpty (base package);

without breaking anything in the GHC repository.

Various tests *.stdout and *.stderr files are amended also.

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ab3ab3e3 by Luite Stegeman at 2025-01-13T12:59:58-05:00
compiler/coreprep: Turn off dictionary speculation by default

Speculative evaluation can cause performance regressions,
therefore we turn it off by default. It can be enabled again
with the -fspec-eval-dictfun flag

See #25284

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3d9cacd5 by Patrick at 2025-01-14T02:34:46+08:00
Enhance kind inference for data family instances
This commit improves kind inference for data family instances by kind-checking
the constructors, for H98 and newtype declarations (ONLY), as well as
kind-checking the result kind signature (when using GADT syntax).
This fixes #25611.

Typechecker changes:
In `tcDataFamInstHeader`, we now kind-check the constructors using
`kcConDecls`, for H98-style decls and newtype decls ONLY.
See Note [Kind inference for data family instances].

Testsuite changes:
  - The T25611{a,b,c,d} tests test the new kind inference implementation.
    - a,b: infer result kind from constructors (H98 case)
    - c: renamed version of test UnliftedNewtypesUnassociatedFamilyFail,
      which now passes
    - d: GADT case, checking that we don't infer overly rigid kinds when
         kind-checking the constructors in data family instances.
 - DataInstanceKindsDefaults tests defaulting data instance kinds
   without UnliftedNewtypes or UnliftedDatatypes, as outlined in
   Note [Defaulting result kind of newtype/data family instance].

Also a few notes are updated to reflect the changes.

Co-authored-by: default avatarSimon Peyton Jones <simon.peytonjones@gmail.com>

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f6493dbc by amesgen at 2025-01-15T18:47:23-05:00
wasm: prevent bundlers from resolving import("node:timers")

This fixes the following esbuild error:

    ✘ [ERROR] Could not resolve "node:timers"

        www/ghc_wasm_jsffi.js:66:25:
          66 │     return (await import("node:timers")).setImmediate;
             ╵                          ~~~~~~~~~~~~~

      The package "node:timers" wasn't found on the file system but is built into node. Are you trying
      to bundle for node? You can use "--platform=node" to do that, which will remove this error.

Previously (i.e. after !13503), one had to work around this by passing
`--external:node:timers`.

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87e82e2e by sheaf at 2025-01-16T14:51:45+01:00
Use checkTyEqRhs to make types concrete

This commit refactors makeTypeConcrete to call checkTyEqRhs with
the appropriate parameters. This avoids duplicating subtle logic
in two places in the compiler.

Changes:

  1. Refactor of 'TyEqFlags'. Now 'TyEqFlags' stores a 'TEFTask', which
     is a description of which of the following checks we want to
     perform in 'checkTyEqRhs':
        - occurs check
        - level check
        - concreteness check

     In the process, the 'AreUnifying' datatype has been removed, as it
     is no longer needed.

  2. Refactor of 'checkTyVar':
      a. Make use of the new 'TEFTask' data type to decide which checks
         to perform.
         In particular, this ensures that we perform **both** a
         concreteness check and a level check when both are required;
         previously we only did a concreteness check (that was a bug!).
      b. Recursively call 'checkTyVar' on the kind of unfilled
         metavariables. This deals with a bug in which we failed to
         uphold the invariant that the kind of a concrete type must
         itself be concrete. See test cases T23051, T23176.

  3. Re-write of 'makeTypeConcrete', which now simply calls
     'checkTyEqRhs' with appropriate 'TyEqFlags'/'TEFTask'.
     This gets rid of code duplication and risk for the two code paths
     going out-of-sync.

Fixes #25616. See also #23883.

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5a8f35bd by ARATA Mizuki at 2025-01-17T11:17:49-05:00
x86 NCG: Use correct format for MOVD in the implementation of unpackInt64X2#

MOVD takes the input format.

Fixes #25658

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14f8a7ec by Mateusz Goślinowski at 2025-01-17T22:49:09+00:00
Allow multiline strings in JS FFI (#25633)

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854c2f75 by Simon Peyton Jones at 2025-01-18T02:54:08-05:00
Fix a buglet in tcSplitForAllTyVarsReqTVBindersN

The problem was that an equation in `split` had two guards (one about
visiblity and one about `n_req`). So it fell thorugh if /either/
was False.  But the next equation then assumed an invisible binder.

Simple bug, easily fixed.  Fixes #25661.

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264a1186 by sheaf at 2025-01-18T10:05:56+00:00
Generalise GHC diagnostic code infrastructure

This commit generalises the infrastructure used for diagnostic codes,
allowing it to be used for other namespaces than the GHC namespace.
In particular, this enables GHCi to re-use the same infrastructure to
emit error messages.

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bf4f5ad3 by Jade at 2025-01-18T10:05:56+00:00
Add structured errors to GHCi (#23338)

This patch creates the 'GhciCommandErrorMessage' data type which
implents the 'Diagnostic' class and also provides error code for these
error conditions.

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b6f54188 by Ben Gamari at 2025-01-18T12:38:46-05:00
Revert "Division by constants optimization"

This appears to be responsible for the regression described in #25653.

This reverts commit daff1e30219d136977c71f42e82ccc58c9013cfb.

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0fd90de8 by Ben Gamari at 2025-01-18T12:38:46-05:00
testsuite: Introduce div2 test

This is a useful test from !8392 which is worth keeping around.

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32680979 by Ben Gamari at 2025-01-18T12:38:46-05:00
testsuite: Test shift correctness in mul2 test

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163aa50a by Ben Gamari at 2025-01-18T12:38:46-05:00
testsuite: Add regression test for #25653

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44778963 by Matthew Pickering at 2025-01-20T11:23:08+00:00
driver: Store an ExternalModuleGraph in the EPS

We now store an ExternalModuleGraph in the EPS. When an new interface is
loaded, the module graph is extended with a node for the loaded
interface. The result is a partial module graph. If you want to run
a transitive closure query on the graph you must first force the
transitive closure to be loaded by using `loadExternalGraphBelow`.

The primary advantage (for now) is that the transitive dependency
calculation does not have to be repeated in getLinkDeps. If your module
had many dependencies and many splices, performing this calculation at
every splice site took a significant amount of time.

We might also want to use this module graph in future for considering
questions such as reachability of rules or accessibilty of instance
imported by levelled imported.

This patch removes another place in the compiler where transitive
dependency is calculated in an ad-hoc manner. In general, the transitive
dependency calculation should be cached and computed using a ModuleGraph
abstraction.

The transitive dependency query required by getLinkDeps operates on a
graph without hs-boot nodes. If a linkable from a module in a loop is
needed, then all modules in the loop are necessary to be available to
execute that module. Therefore there is a query in `ModuleGraph` and
`ExternalModuleGraph` which allows a transitive closure query to be
performed on a graph without loops.

Fixes #25634

-------------------------
Metric Decrease:
    MultiLayerModulesTH_Make
    MultiLayerModulesTH_OneShot
Metric Increase:
    mhu-perf
-------------------------

Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>

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b3c0acfc by Cheng Shao at 2025-01-20T11:53:10-05:00
hie: fix hie.yaml to use default hie-bios script

!13778 accidentally changed hie.yaml to use hie-bios.bat as the
default hie-bios script, which completely breaks hie support on
non-Windows platforms. This patch reverts that change.

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595013d4 by Ben Gamari at 2025-01-21T09:57:23-05:00
compiler: Fix CPP guards around ghc_unique_counter64

The `ghc_unique_counter64` symbol was introduced in the RTS in the
64-bit unique refactor (!10568) which has been backported to %9.6.7 and
%9.8.4. Update the CPP to reflect this.

Fixes #25576.

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09ee3247 by Ryan Scott at 2025-01-21T09:58:00-05:00
Fix :info pretty-printing of UNPACKed fields

This patch:

* Ensures that we do not pretty-print a field like `foo :: {-# UNPACK #-} !Int`
  as `foo :: ! {-# UNPACK -#} Int` (as we were doing before) when running the
  `:info` command.
* Prevents coercions that arise from `UNPACK`ed fields (e.g., such as when one
  unpacks a newtype) from being printed in `:info` output unless `-dppr-debug`
  is enabled.

Fixes #25651.

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6b7ea592 by Rodrigo Mesquita at 2025-01-21T16:10:35-05:00
driver: Store the HomePackageTable in a mutable reference

This commit refactors the HomePackageTable and HomeUnitGraph:

(1) It fixes a quadratic-in-the-number-of-modules space leak in upsweep (#25511)

(2) And it reworks these structures into their own modules to simplify
    the driver. The refactor is driven by the introduction of IO in the HPT
    interface, but is a bit more aggressive in simplifying the
    interfaces to enforce correct usage (ie to avoid performance
    pitfalls).

Specifically:

- The `HomeUnitGraph` (HUG) is now in `GHC.Unit.Home.Graph`
- The `HomePackageTable` (HPT) is now in `GHC.Unit.Home.PackageTable`
    - The HPT now stores an `IORef` with the table of loaded home package modules.
    - The interface to the HPT now requires IO
    - The interface now enforces that the HPT is a datastructure that
      only grows
    - This is not enforced in the interface, but, clients of the HPT
      should never care about there being more or less entries in the
      HPT when these additional entries are not relevant to their result.
    - The exception to the invariant that the HPT is monotonically
      increasing is `restrictHpt`, a function which is called at a
      "barrier point" (during which there are no other threads
      inspecting or inserting in the HPT). The invariant can be
      temporarily broken at this point (currently, after upsweep).
      This is safe because a single thread holds control over the
      structure (thus the invariant being broken is never observed).

The hug_var and associated structures in the driver, which aimed to
improve memory usage in the driver by updating in place a HUG during
upsweep, are no longer required as the HPT entries in the HUG are now
themselves mutable by construction. This was previously explained in
Note [ModuleNameSet, efficiency and space leaks], which is no longer
relevant and was deleted.

Fixes #25511

Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>

-------------------------
Metric Decrease:
    MultiComponentModulesRecomp
    MultiLayerModulesRecomp
-------------------------

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f983a00f by Jens Petersen at 2025-01-21T16:11:12-05:00
hp2ps/Utilities.c: add extern parameter types for malloc and realloc for C23

Fix build with gcc-15 which defaults to C23 standard (-std=gnu23)
Fixes #25662
```
utils/hp2ps/Utilities.c:6:14: error:
     warning: conflicting types for built-in function ‘malloc’; expected ‘void *(long unsigned int)’ [-Wbuiltin-declaration-mismatch]
        6 | extern void* malloc();
          |              ^~~~~~
  |
6 | extern void* malloc();
  |              ^
utils/hp2ps/Utilities.c:5:1: error:
     note: ‘malloc’ is declared in header ‘<stdlib.h>’
        4 | #include "Error.h"
      +++ |+#include <stdlib.h>
        5 | 
  |
5 | 
  | ^
utils/hp2ps/Utilities.c: In function ‘xmalloc’:
utils/hp2ps/Utilities.c:80:17: error:
     error: too many arguments to function ‘malloc’; expected 0, have 1
       80 |     r = (void*) malloc(n);
          |                 ^~~~~~ ~
   |
80 |     r = (void*) malloc(n);
   |                 ^
utils/hp2ps/Utilities.c:6:14: error:
     note: declared here
        6 | extern void* malloc();
          |              ^~~~~~
  |
6 | extern void* malloc();
  |              ^
utils/hp2ps/Utilities.c: In function ‘xrealloc’:
utils/hp2ps/Utilities.c:92:18: error:
     warning: conflicting types for built-in function ‘realloc’; expected ‘void *(void *, long unsigned int)’ [-Wbuiltin-declaration-mismatch]
       92 |     extern void *realloc();
          |                  ^~~~~~~
   |
92 |     extern void *realloc();
   |                  ^
utils/hp2ps/Utilities.c:92:18: error:
     note: ‘realloc’ is declared in header ‘<stdlib.h>’
   |
92 |     extern void *realloc();
   |                  ^
utils/hp2ps/Utilities.c:94:9: error:
     error: too many arguments to function ‘realloc’; expected 0, have 2
       94 |     r = realloc(p, n);
          |         ^~~~~~~ ~
   |
94 |     r = realloc(p, n);
   |         ^
utils/hp2ps/Utilities.c:92:18: error:
     note: declared here
       92 |     extern void *realloc();
          |                  ^~~~~~~
   |
92 |     extern void *realloc();
   |                  ^
```
- - - - -
51e3ec83 by Vladislav Zavialov at 2025-01-22T20:41:32+03:00
Rework built-in and punned names (#25174, #25179, #25180, #25182)

This patch rewrites part of the logic for dealing with built-in and
punned names, making it more principled and fixing a few bugs.

* Kill off filterCTuple. Its purpose was to improve pretty-printing of
  constraint tuples, and the appropriate place for this is namePun_maybe.

* Remove unitTyCon, unboxedUnitTyCon, and soloTyCon from wiredInTyCons.
  Their inclusion in the list was a workaround for shoddy logic in
  lookupOrigNameCache. Now we treat tuples of all arities uniformly.

* In isBuiltInOcc_maybe, only match on actual built-in syntax, e.g. "FUN"
  shouldn't be there (#25174). Also take ListTuplePuns into account (#25179).

* When matching OccNames, use the ShortByteString directly to avoid
  potentially costly conversions to ByteString and String.

* Introduce isInfiniteFamilyOrigName_maybe, a purpose-built helper for
  looking up tuples/sums in the OrigNameCache. This clears up the previously
  convoluted relation between the orig name cache and built-in syntax.

* Reuse isKnownOrigName_maybe to eliminate the need for isPunOcc_maybe.

* Classify MkSolo and MkSolo# as UserSyntax, thus fixing whole-module
  reexports (#25182).

* Teach valid-hole-fits about tuples, unboxed tuples, and unboxed sums,
  up to a certain arity (#25180).

* Drop the unnecessary special case for unary constraint tuples in the
  type checker (finish_tuple). It was a workaround for the lack of CSolo.

* Update Notes and other comments, add tests.

- - - - -
85c60aea by Teo Camarasu at 2025-01-23T18:06:21-05:00
doc: Add documentation for -XDoAndIfThenElse

Resolves #18631

Co-authored-by: Richard Eisenberg <rae@cs.brynmawr.edu>

- - - - -
4495e48f by Brandon Chinn at 2025-01-24T11:54:24-05:00
Break out GHC.Parser.Lexer.Interface

- - - - -
4f8fc11e by Brandon Chinn at 2025-01-24T11:54:24-05:00
Fix lexing comments in multiline strings (#25609)

Metric Decrease:
    MultiLayerModulesRecomp
    parsing001

- - - - -
e7ab778f by Matthew Pickering at 2025-01-24T11:55:01-05:00
testsuite: Pass TEST_HC_OPTS to many more tests

This passes `-dno-debug-output` to the test and `-dlint.

- - - - -
c3593101 by Sylvain Henry at 2025-01-24T23:12:20-05:00
Merge ghc-prim's modules into ghc-internal (#24453)

ghc-internal becomes the only wired-in package exposing primitives.

There are some minor GHC allocation regressions, but they barely cross
the thresholds and only with the wasm backend. They're likely due to
longer symbols (ghc-internal vs ghc-prim, GHC.Internal.X vs GHC.X).

Metric Increase:
    T13035
    T1969
    T4801
    T9961

- - - - -
70f7741a by Jens Petersen at 2025-01-24T23:12:58-05:00
hp2ps/Utilities.c: add extern parameter types for malloc and realloc for C23

use portable C types!

- - - - -
a1d92378 by Brandon Chinn at 2025-01-25T15:11:54-08:00
Fix for alex-3.5.2.0 (#25623)

This INLINE pragma for alexScanUser was added in 9.12, but then I
ported the change to alex in 3.5.2.0
(https://github.com/haskell/alex/pull/262).

I didn't realize that GHC errors on duplicate INLINE pragmas, so
this ended up being a breaking change.

This change should be backported into 9.12

- - - - -
62760367 by ARATA Mizuki at 2025-01-27T16:23:06-05:00
x86 NCG: Make MOVD's output format explicit

The old design led to inference of a wrong format,
losing upper bits of a vector register.

Fixes #25659

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

- - - - -
f19ab490 by Simon Hengel at 2025-01-27T16:23:45-05:00
doc: Correct JSON schema for `-fdiagnostics-as-json` (fixes #25393)

- - - - -
e16eae65 by Cheng Shao at 2025-01-27T21:41:39+00:00
hadrian: fix bootstrap with 9.12.1

This patch bumps hadrian index-state to fix bootstrap with 9.12.1.

- - - - -
8071bad8 by Jeffrey Young at 2025-01-28T21:45:32-05:00
base: add SrcLoc changes to changelog, 4.21.0.0

I accidentally dropped this in !13381

- closes #25614

See:

- ea4587794b9e3a098f9c02bd6cea2294af2539ce  (the 13381 commit)
- Issue #25614

- - - - -
9dcc7e28 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00
Rename `cloneBndrs` and such — now all the monadic ones have an `M` suffix.

We now have `cloneBndrs` and `cloneRecIdBndrs` which take a `UniqSupply` argument, and `cloneBndrsM` and `cloneRecIdBndrsM` which rather have a `MonadUnique` constraint.

- - - - -
643dd3d8 by Matthew Farkas-Dyck at 2025-01-29T02:27:48-05:00
Use `Infinite` in unique generation, and clean up some other partial uni patterns as well.

Also drop the losing `instance MonadFail UniqSM`.

We redefine `getUniquesM` in terms of `Infinite` rather than `[]`, and define another method `getUniqueListM` for the use sites where we actually want a `[]`.
Thus, at many sites, we can avoid the partiality of the empty list case.

We also define `withUniques`, `withUniquesM`, and `withUniquesM'`, which traverse an arbitrary `Traversable` structure and introduce a `Unique` for each element.
This allows us to redefine various functions to operate on more appropriate types than `[]` and avoid further partiality (in the form of incomplete-uni-patterns).

- - - - -
dd0acc3c by M Farkas-Dyck at 2025-01-29T02:27:48-05:00
Use `Infinite` in `GHC.Tc.Deriv.Functor`.

Make the list of variables to use in generated code `Infinite`, to avoid panicking on the (now impossible) empty list case.

- - - - -
4e9adedf by M Farkas-Dyck at 2025-01-29T02:27:48-05:00
Use `Infinite` in `GHC.Runtime.Debugger`.

Make the list of available names `Infinite`, to avoid panicking on the (now impossible) empty list case.

- - - - -
bed812b7 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00
Avoid incomplete-uni-patterns in `GHC.Cmm.DebugBlock`.

We do so by changing the type of `BlockContext` to statically (in GHC) exclude the possibility of Cmm statics, and using `NonEmpty` lists of `BlockContext`s in `cmmDebugGen`.

- - - - -
27587df3 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00
Avoid incomplete-uni-patterns in `GHC.Types.Literal`.

We do so by introducing `mkLitNumberWrap'` whose ultimate codomain is `Integer` rather than `Literal`, and then use that rather than `mkLitNumberWrap` where we just need the number rather than the `Literal`.

- - - - -
138de0ff by M Farkas-Dyck at 2025-01-29T02:27:48-05:00
Avoid incomplete-uni-patterns in `GHC.CmmToAsm.X86.CodeGen`.

- Match the vector element list only once in `shuffleInstructions`.
- Define `isSuitableFloatingPointLit_maybe` which returns `Just` the width if the lit is indeed suitable.

- - - - -
d8cb3d36 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00
Clean up more incomplete uni patterns.

At some sites, we merely panic if the `[]` or `Maybe` is empty when we convert to `NonEmpty` or `Identity`, but at least now we make it explicit.

At other sites, we are able to use more precise types and avoid the partiality altogether. To do so, we redefine various functions to operate over `Traversable` arguments, so we can use the appropriate shape where known.

- - - - -
f251bd22 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00
Outline `expectJustPanic`.

- - - - -
a963a1a5 by Marc Scholten at 2025-01-29T02:28:35-05:00
base: Introduce Data.Enum.enumerate (CLC #306)

https://github.com/haskell/core-libraries-committee/issues/306

- - - - -
944712da by Ben Gamari at 2025-01-29T02:29:13-05:00
base: Update description of locking behavior
- - - - -
85abc69c by Ben Gamari at 2025-01-29T02:29:51-05:00
base: Fix @since annotation of Data.Bounded

Fixes #25615.

- - - - -
2ca41c62 by Ben Gamari at 2025-01-29T02:30:29-05:00
StgToByteCode: Fix overly-broad handling of Addr# literals

Previously we assumed that all unlifted types were `Addr#` but this
isn't true. As noted in #25638, unlifted nullary data constructor
workers can also appear at the top-level and are obviously not of type
`Addr#`.

Note that there is more work to be done to properly handle unlifted data
constructors (especially nullary; see #25636). However, this is a small
step in the right direction.

Closes #25641.

- - - - -
ec26c54d by Ben Gamari at 2025-01-29T02:30:29-05:00
StgToByteCode: Assert that PUSH_G'd values are lifted

We currently do not support top-level unlifted data constructor applications,
therefore this is a safe assertion.

Pointed out by @sheaf.
- - - - -
8847125f by Ben Gamari at 2025-01-29T02:31:07-05:00
gitlab-ci: Run test-primops testsuite in ~"full-ci" pipeline

Closes #25654.

- - - - -
bf8c7d6e by Matthew Pickering at 2025-01-29T02:31:44-05:00
bytecode: Do not generate `SLIDE x 0` instructions

SLIDE x 0 is a no-op as it means to shift x elements of the stack by no
spaces. In the interpreter, this results in a loop which copies an array
element into the same place.

I have instrumented GHCi to count how many of these instructions are interpreted.
The workload was `ghc` compiling two simple modules.

Total no-op slides: 7793476
Total slides: 11413289
Percentage useless (slides): 68%
Percentage uselss of total instructions: 9%

- - - - -
7bfc93a7 by Zubin Duggal at 2025-01-29T21:41:17-05:00
hackage-doc-tarball: Allow ghc-boot-th to be uploaded to hackage

It can't refer to files outside its source directory, so patch that part out.
This is OK because those files are only used while bootstrapping.

Also add ghci to the list of packages to be uploaded

Fixes #25687

- - - - -
704eeb02 by Roman S at 2025-01-29T21:42:05-05:00
Fix Control.Arrow (***) diagram (fixes #25698)
- - - - -
662645f0 by Matthew Pickering at 2025-02-03T11:44:41-05:00
compiler: Always load GHC.Data.FastString optimised into GHCi

The FastString table is shared between the boot compiler and interpreted
compiler. Therefore it's very important the representation of
`FastString` matches in both cases. Otherwise, the interpreter will read
a FastString from the shared variable but place the fields in the wrong
place which leads to segfaults.

Ideally this state would not be shared, but for now we can always
compile both with `-O2` and this leads to a working interpreter.

- - - - -
05e5785a by Peter Trommler at 2025-02-03T11:45:17-05:00
RTS: Fix compile on powerpc64 ELF v1

Cabal does not know about the different ABIs for powerpc64 and compiles
StgCRunAsm.S unconditionally. The old make-based build system excluded
this file from the build and it was OK to signal an error when it was
compiled accidentally.

With this patch we compile StgCRunAsm.S to an empty file, which fixes
the build.

Fixes #25700

- - - - -
cbbb64fb by Matthew Pickering at 2025-02-03T23:40:33-05:00
interpreter: Always print unit and module name in BCO_NAME instruction

Currently the BCO_Name instruction is a bit difficult to use since the
names are not qualified by the module they come from. When you have a
very generic name such as "wildX4", it becomes impossible to work out
which module the identifier comes from.

Fixes #25694

- - - - -
764a43ac by Ben Gamari at 2025-02-03T23:41:10-05:00
upload-ghc-libs: Drop more references to ghc-internal from ghc-boot-th

(cherry picked from commit afec4b75c2d0e9f5c462a86d9f3697acf30355c7)

Co-authored-by: Ben Gamari <bgamari.foss@gmail.com>
- - - - -
9a59b026 by Ben Gamari at 2025-02-04T10:00:18-05:00
gitlab-ci: Don't use .full-ci to run test-primops

test-primops depends upon the existence of validate jobs, yet these do
not exist in the context of nightly jobs, which .full-ci includes.

- - - - -
7cc08550 by Ben Gamari at 2025-02-04T18:34:49-05:00
CorePrep: Name `sat` binders more descriptively

- - - - -
fb40981d by Ben Gamari at 2025-02-04T18:35:26-05:00
ghc-toolchain: Parse i686 triples

This is a moniker used for later 32-bit x86 implementations
(Pentium Pro and later).

Fixes #25691.

- - - - -
02794411 by Cheng Shao at 2025-02-04T18:36:03-05:00
compiler: remove unused assembleOneBCO function

This patch removes the unused assembleOneBCO function from the
bytecode assembler.

- - - - -
db19c8a9 by Matthew Pickering at 2025-02-05T23:16:50-05:00
perf: Replace uses of genericLength with strictGenericLength

genericLength is a recursive function and marked NOINLINE. It is not
going to specialise. In profiles, it can be seen that 3% of total compilation
time when computing bytecode is spend calling this non-specialised
function.

In addition, we can simplify `addListToSS` to avoid traversing the input
list twice and also allocating an intermediate list (after the call to
reverse).

Overall these changes reduce the time spend in 'assembleBCOs' from 5.61s
to 3.88s. Allocations drop from 8GB to 5.3G.

Fixes #25706

- - - - -
5622a14a by Matthew Pickering at 2025-02-05T23:17:27-05:00
perf: nameToCLabel: Directly manipulate ByteString rather than going via strings

`nameToCLabel` is called from `lookupHsSymbol` many times during
bytecode linking. We can save a lot of allocations and time by directly
manipulating the bytestrings rather than going via intermediate lists.

Before: 2GB allocation, 1.11s
After: 260MB allocation, 375ms

Fixes #25719

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

- - - - -
66c7f656 by Matthew Pickering at 2025-02-06T17:15:25-05:00
interpreter: Fix INTERP_STATS profiling code

The profiling code had slightly bitrotted since the last time it was
used. This just fixes things so that if you toggle the INTERP_STATS
macro then it just works and prints out the stats.

Fixes #25695

- - - - -
f71c2835 by Matthew Pickering at 2025-02-06T17:16:02-05:00
perf: Key the interpreter symbol cache by Name rather than FastString

Profiles showed that about 0.2s was being spend constructing the keys
before looking up values in the old symbol cache.

The performance of this codepath is critical as it translates directly
to a delay when a user evaluates a function like `main` in the
interpreter.

Therefore we implement a solution which keys the cache(s) by `Name`
rather than the symbol directly, so the cache can be consulted before
the symbol is constructed.

Fixes #25731

- - - - -
8f8d3a90 by Ben Gamari at 2025-02-08T01:17:28-05:00
base: Label threads forked by IO operations

Addresses part of #25452.