[Git][ghc/ghc][wip/jeltsch/obtaining-os-handles] 197 commits: rts: Refactor parsing of -h flags

12 Dec 2025

      Wolfgang Jeltsch pushed to branch wip/jeltsch/obtaining-os-handles at Glasgow Haskell Compiler / GHC

Commits:
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).

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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.

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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

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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

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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.

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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.

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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

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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.

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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.

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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.

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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

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1da0c700 by Andreas Klebinger at 2025-10-06T18:05:14-04:00
Testsuite: Silence warnings about Wx-partial in concprog001

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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

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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.

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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.

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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

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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

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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.

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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.

- - - - -
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

- - - - -
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>

- - - - -
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

- - - - -
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.

- - - - -
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

- - - - -
17231bfb by fendor at 2025-10-21T13:12:20+01:00
Add regression test for #26507

- - - - -
4f5bf93b by Simon Peyton Jones at 2025-10-25T04:05:34-04:00
Postscript to fix for #26255

This MR has comments only

- - - - -
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

- - - - -
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

- - - - -
99d5707f by sheaf at 2025-10-26T18:23:52-04:00
Rename PatSyn MatchContext to PatSynCtx to avoid punning

- - - - -
5dc2e9ea by Julian Ospald at 2025-10-27T18:17:23-04:00
Skip uniques test if sources are not available

- - - - -
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.

- - - - -
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.

- - - - -
4038a28b by Andreas Klebinger at 2025-10-30T12:38:52-04:00
Add a perf test for #26425

- - - - -
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

- - - - -
d086c474 by Peter Trommler at 2025-10-31T18:43:13-04:00
ghc-toolchain: refactor, move lastLine to Utils

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
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.

- - - - -
2e2aec1e by Simon Peyton Jones at 2025-11-03T08:33:05+00:00
Comments about defaulting representation equalities

- - - - -
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`

- - - - -
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

- - - - -
9aa5ee99 by Simon Peyton Jones at 2025-11-03T08:33:28+00:00
Comments only -- remove dangling Note references

- - - - -
6683f183 by Simon Peyton Jones at 2025-11-03T08:33:28+00:00
Accept error message wibbles

- - - - -
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

- - - - -
c5b3541f by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00
cabal-reinstall: Use haddock-api +in-tree-ghc

Fixes #26202

- - - - -
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

- - - - -
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.

- - - - -
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.

- - - - -
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

- - - - -
984635c0 by Wolfgang Jeltsch at 2025-12-11T20:22:31+02:00
Add operations for obtaining operating-system handles

This resolves #26265.

- - - - -

986 changed files:

- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- .gitlab/rel_eng/upload_ghc_libs.py
- .gitmodules
- cabal.project-reinstall
- compile_flags.txt
- compiler/GHC.hs
- compiler/GHC/Builtin/PrimOps.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/primops.txt.pp
- compiler/GHC/ByteCode/Breakpoints.hs
- compiler/GHC/ByteCode/Linker.hs
- + compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Cmm/CLabel.hs
- compiler/GHC/Cmm/Info.hs
- compiler/GHC/Cmm/Info/Build.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Opt.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Pipeline.hs
- compiler/GHC/Cmm/Sink.hs
- compiler/GHC/Cmm/UniqueRenamer.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/RegInfo.hs
- compiler/GHC/CmmToAsm/Config.hs
- compiler/GHC/CmmToAsm/LA64/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/RegInfo.hs
- compiler/GHC/CmmToAsm/Reg/Linear.hs
- compiler/GHC/CmmToAsm/Reg/Liveness.hs
- compiler/GHC/CmmToAsm/Wasm/FromCmm.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/Base.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/ConLike.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/CallArity.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Pipeline.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/PatSyn.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/RoughMap.hs
- compiler/GHC/Core/SimpleOpt.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/TyCon.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/FlatBag.hs
- compiler/GHC/Data/OsPath.hs
- compiler/GHC/Data/SmallArray.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/CodeOutput.hs
- compiler/GHC/Driver/Config/CmmToAsm.hs
- compiler/GHC/Driver/Config/Core/Lint.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/Downsweep.hs
- compiler/GHC/Driver/DynFlags.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/LlvmConfigCache.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeFile.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/Execute.hs
- compiler/GHC/Driver/Pipeline/Phases.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Driver/Session.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/Expr.hs
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Breakpoints.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Foreign/C.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.hs
- compiler/GHC/HsToCore/Foreign/Wasm.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Pmc/Utils.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Decl.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Flags.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp/Flags.hs
- compiler/GHC/Iface/Rename.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/JS/JStg/Monad.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/Windows.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Platform.hs
- compiler/GHC/Platform/Reg.hs
- compiler/GHC/Prelude/Basic.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Rename/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Debugger.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Interpreter.hs
- + compiler/GHC/Runtime/Interpreter/C.hs
- + compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Settings.hs
- compiler/GHC/Stg/Debug.hs
- + compiler/GHC/Stg/Debug/Types.hs
- compiler/GHC/Stg/EnforceEpt.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/StgToCmm/ExtCode.hs
- compiler/GHC/StgToCmm/Monad.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToJS/Apply.hs
- compiler/GHC/StgToJS/CodeGen.hs
- compiler/GHC/StgToJS/Expr.hs
- compiler/GHC/StgToJS/Ids.hs
- compiler/GHC/StgToJS/Linker/Linker.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/SysTools/Tasks.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Hole.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Expr.hs-boot
- 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/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/Equality.hs
- + compiler/GHC/Tc/Solver/FunDeps.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/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/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/Constraint.hs
- compiler/GHC/Tc/Types/CtLoc.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/Origin.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/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
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- utils/jsffi/dyld.mjs

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/b6ef1bfd4734cd0cc50974eb5b040de...

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[Git][ghc/ghc][wip/jeltsch/obtaining-os-handles] 197 commits: rts: Refactor parsing of -h flags

Wolfgang Jeltsch (＠jeltsch)