[Git][ghc/ghc][wip/hie-file-improvements] 1433 commits: MachRegs.h: Don't define NO_ARG_REGS when a XMM register is defined

4 Aug 2026

      Hannes Siebenhandl pushed to branch wip/hie-file-improvements at Glasgow Haskell Compiler / GHC

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

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

Closes #25985

A couple of notes on the BROKEN_TESTS field:

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

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

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

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

Before, there were two problems with the message.

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

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

This patch fixes both these issues.

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

Fixes #26031, #26035

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

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

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

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

Fixes #26120 #22586.

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

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

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

Fixes #25956

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

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

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

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

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

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

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

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

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

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

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

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

where

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

and

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

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

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

  additionally,

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

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

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

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

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

More specifically:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

To that end, see the changes to:

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

and the new helpers split_con_ty_args, zip_pats_bndrs.

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

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

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

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

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

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

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

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

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

Fixes #26118

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

The following updates were made:

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

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

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

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

Fixes part of ghc#23675.

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

Fixes #23675.

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

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

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

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

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

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

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

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

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

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

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

Closes #13103.

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

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

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

Cf #26139

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

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

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

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

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

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

    ghci> :reload <Mod>

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

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

    ghci> :reload none

Is in principle identical to starting a new session with the
`-fno-load-initial-targets` flag.

The `-fno-load-initial-targets` flag allows for faster startup time of GHCi when a
user has lots of `Target`s.

We additionally extend the `:reload` command to accept multiple
`ModuleName`s. For example:

    ghci> :reload <Mod1> <Mod2>

Loads all modules up to the modules `Mod1` and `Mod2`.

- - - - -
49f44e52 by Teo Camarasu at 2025-06-26T04:19:51-04:00
Expose ghc-internal unit id through the settings file

This in combination with the unit id of the compiler library allows
cabal to know of the two unit ids that should not be reinstalled (in
specific circumstances) as:
- when using plugins, we want to link against exactly the compiler unit
id
- when using TemplateHaskell we want to link against exactly the package
that contains the TemplateHaskell interfaces, which is `ghc-internal`

See: <https://github.com/haskell/cabal/issues/10087>

Resolves #25282

- - - - -
499c4efe by Bryan Richter at 2025-06-26T04:20:33-04:00
CI: Fix and clean up capture of timings

* Fixes the typo that caused 'cat ci-timings' to report "no such file or
  directory"
* Gave ci_timings.txt a file extension so it may play better with other
  systems
* Fixed the use of time_it so all times are recorded
* Fixed time_it to print name along with timing

- - - - -
86c90c9e by Bryan Richter at 2025-06-26T04:20:33-04:00
CI: Update collapsible section usage

The syntax apparently changed at some point.

- - - - -
04308ee4 by Bryan Richter at 2025-06-26T04:20:33-04:00
CI: Add more collapsible sections

- - - - -
43b606bb by Florian Ragwitz at 2025-06-27T16:31:26-04:00
Tick uses of wildcard/pun field binds as if using the record selector function

Fixes #17834.

See Note [Record-selector ticks] for additional reasoning behind this as well
as an overview of the implementation details and future improvements.

- - - - -
d4952549 by Ben Gamari at 2025-06-27T16:32:08-04:00
testsuite/caller-cc: Make CallerCc[123] less sensitive

These were previously sensitive to irrelevant changes in program
structure. To avoid this we filter out all by lines emitted by the
-fcaller-cc from the profile.

- - - - -
8d33d048 by Berk Özkütük at 2025-07-07T20:42:20-04:00
Consider `PromotedDataCon` in `tyConStupidTheta`

Haddock checks data declarations for the stupid theta so as not to
pretty-print them as empty contexts. Type data declarations end up as
`PromotedDataCon`s by the time Haddock performs this check, causing a
panic. This commit extends `tyConStupidTheta` so that it returns an
empty list for `PromotedDataCon`s. This decision was guided by the fact
that type data declarations never have data type contexts (see (R1) in
Note [Type data declarations]).

Fixes #25739.

- - - - -
a26243fd by Ryan Hendrickson at 2025-07-07T20:43:07-04:00
haddock: Document instances from other packages

When attaching instances to `Interface`s, it isn't enough just to look
for instances in the list of `Interface`s being processed. We also need
to look in the modules on which they depend, including those outside of
this package.

Fixes #25147.
Fixes #26079.

- - - - -
0fb24420 by Rodrigo Mesquita at 2025-07-07T20:43:49-04:00
hadrian: Fallback logic for internal interpreter

When determining whether to build the internal interpreter, the `make`
build system had a fallback case for platforms not in the list of
explicitly-supported operating systems and architectures.

This fallback says we should try to build the internal interpreter if
building dynamic GHC programs (if the architecture is unknown).

Fixes #24098

- - - - -
fe925bd4 by Ben Gamari at 2025-07-07T20:44:30-04:00
users-guide: Reference Wasm FFI section

- - - - -
5856284b by Ben Gamari at 2025-07-07T20:44:30-04:00
users-guide: Fix too-short heading warning

- - - - -
a48dcdf3 by Duncan Coutts at 2025-07-07T20:45:18-04:00
Reorganise documentation for allocate* functions

Consolodate interface information into the .h file, keeping just
implementation details in the .c file.

Use Notes stlye in the .h file and refer to notes from the .c file.

- - - - -
de5b528c by Duncan Coutts at 2025-07-07T20:45:18-04:00
Introduce common utilities for allocating arrays

The intention is to share code among the several places that do this
already.

- - - - -
b321319d by Duncan Coutts at 2025-07-07T20:45:18-04:00
Use new array alloc utils in Heap.c

The CMM primop can now report heap overflow.

- - - - -
1d557ffb by Duncan Coutts at 2025-07-07T20:45:18-04:00
Use new array alloc utils in ThreadLabels.c

Replacing a local utility.

- - - - -
e59a1430 by Duncan Coutts at 2025-07-07T20:45:18-04:00
Use new array alloc utils in Threads.c

Replacing local open coded version.

- - - - -
482df1c9 by Duncan Coutts at 2025-07-07T20:45:18-04:00
Add exitHeapOverflow helper utility

This will be useful with the array alloc functions, since unlike
allocate/allocateMaybeFail, they do not come in two versions. So if it's
not convenient to propagate failure, then one can use this.

- - - - -
4d3ec8f9 by Duncan Coutts at 2025-07-07T20:45:18-04:00
Use new array alloc utils in Weak.c

Also add a cpp macro CCS_SYSTEM_OR_NULL which does what it says. The
benefit of this is that it allows us to referece CCS_SYSTEM even when
we're not in PROFILING mode. That makes abstracting over profiling vs
normal mode a lot easier.

- - - - -
0c4f2fde by Duncan Coutts at 2025-07-07T20:45:18-04:00
Convert the array alloc primops to use the new array alloc utils

- - - - -
a3354ad9 by Duncan Coutts at 2025-07-07T20:45:18-04:00
While we're at it, add one missing 'likely' hint

To a cmm primops that raises an exception, like the others now do.

- - - - -
33b546bd by meooow25 at 2025-07-07T20:46:09-04:00
Keep scanl' strict in the head on rewrite

`scanl'` forces elements to WHNF when the corresponding `(:)`s are
forced. The rewrite rule for `scanl'` missed forcing the first element,
which is fixed here with a `seq`.

- - - - -
8a69196e by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00
debugger/rts: Allow toggling step-in per thread

The RTS global flag `rts_stop_next_breakpoint` globally sets the
interpreter to stop at the immediate next breakpoint.

With this commit, single step mode can additionally be set per thread in
the TSO flag (TSO_STOP_NEXT_BREAKPOINT).

Being able to toggle "stop at next breakpoint" per thread is an
important requirement for implementing "stepping out" of a function in a
multi-threaded context.

And, more generally, having a per-thread flag for single-stepping paves the
way for multi-threaded debugging.

That said, when we want to enable "single step" mode for the whole
interpreted program we still want to stop at the immediate next
breakpoint, whichever thread it belongs to.

That's why we also keep the global `rts_stop_next_breakpoint` flag, with
`rts_enableStopNextBreakpointAll` and `rts_disableStopNextBreakpointAll` helpers.

Preparation for #26042

- - - - -
73d3f864 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00
docs: Case continuation BCOs

This commit documents a subtle interaction between frames for case BCOs
and their parents frames. Namely, case continuation BCOs may refer to
(non-local) variables that are part of the parent's frame.

The note expanding a bit on these details is called [Case continuation BCOs]

- - - - -
d7aeddcf by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00
debugger: Implement step-out feature

Implements support for stepping-out of a function (aka breaking right after
returning from a function) in the interactive debugger.

It also introduces a GHCi command :stepout to step-out of a function
being debugged in the interpreter. The feature is described as:

    Stop at the first breakpoint immediately after returning from the current
    function scope.

    Known limitations: because a function tail-call does not push a stack
    frame, if step-out is used inside of a function that was tail-called,
    execution will not be returned to its caller, but rather its caller's
    first non-tail caller. On the other hand, it means the debugger
    follows the more realistic execution of the program.
    In the following example:

    .. code-block:: none

    f = do
       a
       b <--- (1) set breakpoint then step in here
       c
    b = do
       ...
       d <--- (2) step-into this tail call
    d = do
       ...
       something <--- (3) step-out here
       ...

    Stepping-out will stop execution at the `c` invokation in `f`, rather than
    stopping at `b`.

The key idea is simple: When step-out is enabled, traverse the runtime
stack until a continuation BCO is found -- and enable the breakpoint
heading that BCO explicitly using its tick-index.
The details are specified in `Note [Debugger: Step-out]` in `rts/Interpreter.c`.

Since PUSH_ALTS BCOs (representing case continuations) were never headed
by a breakpoint (unlike the case alternatives they push), we introduced
the BRK_ALTS instruction to allow the debugger to set a case
continuation to stop at the breakpoint heading the alternative that is
taken. This is further described in `Note [Debugger: BRK_ALTS]`.

Fixes #26042

- - - - -
5d9adf51 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00
debugger: Filter step-out stops by SrcSpan

To implement step-out, the RTS looks for the first continuation frame on
the stack and explicitly enables its entry breakpoint. However, some
continuations will be contained in the function from which step-out was
initiated (trivial example is a case expression).

Similarly to steplocal, we will filter the breakpoints at which the RTS
yields to the debugger based on the SrcSpan. When doing step-out, only
stop if the breakpoint is /not/ contained in the function from which we
initiated it.

This is especially relevant in monadic statements such as IO which is
compiled to a long chain of case expressions.

See Note [Debugger: Filtering step-out stops]

- - - - -
7677adcc by Cheng Shao at 2025-07-08T07:40:29-04:00
compiler: make ModBreaks serializable

- - - - -
14f67c6d by Rodrigo Mesquita at 2025-07-08T07:40:29-04:00
refactor: "Inspecting the session" moved from GHC

Moved utilities for inspecting the session from the GHC module to
GHC.Driver.Session.Inspect

Purely a clean up

- - - - -
9d3f484a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Pass the HUG to readModBreaks, not HscEnv

A minor cleanup. The associated history and setupBreakpoint functions
are changed accordingly.

- - - - -
b595f713 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Move readModBreaks to GHC.Runtime.Interpreter

With some small docs changes

- - - - -
d223227a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Move interpreterProfiled to Interp.Types

Moves interpreterProfiled and interpreterDynamic to
GHC.Runtime.Interpreter.Types from GHC.Runtime.Interpreter.

- - - - -
7fdd0a3d by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Don't import GHC in Debugger.Breakpoints

Remove the top-level

    import GHC

from GHC.Runtime.Debugger.Breakpoints

This makes the module dependencies more granular and cleans up the
qualified imports from the code.

- - - - -
5e4da31b by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
refactor: Use BreakpointId in Core and Ifaces

- - - - -
741ac3a8 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
stg2bc: Derive BcM via ReaderT StateT

A small refactor that simplifies GHC.StgToByteCode by deriving-via the
Monad instances for BcM. This is done along the lines of previous
similar refactors like 72b54c0760bbf85be1f73c1a364d4701e5720465.

- - - - -
0414fcc9 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
refact: Split InternalModBreaks out of ModBreaks

There are currently two competing ways of referring to a Breakpoint:

    1. Using the Tick module + Tick index
    2. Using the Info module + Info index

1. The Tick index is allocated during desugaring in `mkModBreaks`. It is
used to refer to a breakpoint associated to a Core Tick. For a given
Tick module, there are N Ticks indexed by Tick index.

2. The Info index is allocated during code generation (in StgToByteCode)
and uniquely identifies the breakpoints at runtime (and is indeed used
to determine which breakpoint was hit at runtime).

Why we need both is described by Note [Breakpoint identifiers].

For every info index we used to keep a `CgBreakInfo`, a datatype containing
information relevant to ByteCode Generation, in `ModBreaks`.

This commit splits out the `IntMap CgBreakInfo` out of `ModBreaks` into
a new datatype `InternalModBreaks`.

    - The purpose is to separate the `ModBreaks` datatype, which stores
      data associated from tick-level information which is fixed after
      desugaring, from the unrelated `IntMap CgBreakInfo` information
      accumulated during bytecode generation.

    - We move `ModBreaks` to GHC.HsToCore.Breakpoints

The new `InternalModBreaks` simply combines the `IntMap CgBreakInfo`
with `ModBreaks`. After code generation we construct an
`InternalModBreaks` with the `CgBreakInfo`s we accumulated and the
existing `ModBreaks` and store that in the compiled BCO in `bc_breaks`.

    - Note that we previously only updated the `modBreaks_breakInfo`
      field of `ModBreaks` at this exact location, and then stored the
      updated `ModBreaks` in the same `bc_breaks`.

    - We put this new datatype in GHC.ByteCode.Breakpoints

The rest of the pipeline for which CgBreakInfo is relevant is
accordingly updated to also use `InternalModBreaks`

- - - - -
2a097955 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
cleanup: Use BreakpointIds in bytecode gen

Small clean up to use BreakpointId and InternalBreakpointId more
uniformly in bytecode generation rather than using Module + Ix pairs

- - - - -
0515cc2f by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00
ghci: Allocate BreakArrays at link time only

Previously, a BreakArray would be allocated with a slot for every tick
in a module at `mkModBreaks`, in HsToCore. However, this approach has
a few downsides:

- It interleaves interpreter behaviour (allocating arrays for
  breakpoints) within the desugarer

- It is inflexible in the sense it is impossible for the bytecode
  generator to add "internal" breakpoints that can be triggered at
  runtime, because those wouldn't have a source tick. (This is relevant
  for our intended implementation plan of step-out in #26042)

- It ties the BreakArray indices to the *tick* indexes, while at runtime
  we would rather just have the *info* indexes (currently we have both
  because BreakArrays are indexed by the *tick* one).

Paving the way for #26042 and #26064, this commit moves the allocation
of BreakArrays to bytecode-loading time -- akin to what is done for CCS
arrays.

Since a BreakArray is allocated only when bytecode is linked, if a
breakpoint is set (e.g. `:break 10`) before the bytecode is linked,
there will exist no BreakArray to trigger the breakpoint in.

Therefore, the function to allocate break arrays (`allocateBreakArrays`)
is exposed and also used in GHC.Runtime.Eval to allocate a break array
when a breakpoint is set, if it doesn't exist yet (in the linker env).

- - - - -
8016561f by Simon Peyton Jones at 2025-07-08T07:41:13-04:00
Add a test for T26176

- - - - -
454cd682 by Simon Peyton Jones at 2025-07-08T07:41:13-04:00
Add test for #14010

This test started to work in GHC 9.6 and has worked since.
This MR just adds a regression test

- - - - -
ea2c6673 by Teo Camarasu at 2025-07-08T13:24:43-04:00
Implement user-defined allocation limit handlers

Allocation Limits allow killing a thread if they allocate more than a
user-specified limit.
We extend this feature to allow more versatile behaviour.

- We allow not killing the thread if the limit is exceeded.
- We allow setting a custom handler to be called when the limit is exceeded.

User-specified allocation limit handlers run in a fresh thread and are passed
the ThreadId of the thread that exceeded its limit.

We introduce utility functions for getting and setting the allocation
limits of other threads, so that users can reset the limit of a thread
from a handler. Both of these are somewhat coarse-grained as we are
unaware of the allocations in the current nursery chunk.

We provide several examples of usages in testsuite/tests/rts/T22859.hs

Resolves #22859

- - - - -
03e047f9 by Simon Hengel at 2025-07-08T13:25:25-04:00
Fix typo in using.rst

- - - - -
67957854 by Ben Gamari at 2025-07-09T09:44:44-04:00
compiler: Import AnnotationWrapper from ghc-internal

Since `GHC.Desugar` exported from `base` has been deprecated.

- - - - -
813d99d6 by Ben Gamari at 2025-07-09T09:44:44-04:00
ghc-compact: Eliminate dependency on ghc-prim

- - - - -
0ec952a1 by Ben Gamari at 2025-07-09T09:44:44-04:00
ghc-heap: Eliminate dependency on ghc-prim

- - - - -
480074c3 by Ben Gamari at 2025-07-09T09:44:44-04:00
ghc-heap: Drop redundant import

- - - - -
03455829 by Ben Gamari at 2025-07-09T09:44:45-04:00
ghc-prim: Bump version to 0.13.1

There are no interface changes from 0.13.0 but the implementation now
lives in `ghc-internal`.

- - - - -
d315345a by Ben Gamari at 2025-07-09T09:44:45-04:00
template-haskell: Bump version number to 2.24.0.0

Bumps exceptions submodule.

- - - - -
004c800e by Ben Gamari at 2025-07-09T09:44:45-04:00
Bump GHC version number to 9.14

- - - - -
eb1a3816 by Ben Gamari at 2025-07-09T09:44:45-04:00
Bump parsec to 3.1.18.0

Bumps parsec submodule.

- - - - -
86f83296 by Ben Gamari at 2025-07-09T09:44:45-04:00
unix: Bump to 2.8.7.0

Bumps unix submodule.

- - - - -
89e13998 by Ben Gamari at 2025-07-09T09:44:45-04:00
binary: Bump to 0.8.9.3

Bumps binary submodule.

- - - - -
55fff191 by Ben Gamari at 2025-07-09T09:44:45-04:00
Win32: Bump to 2.14.2.0

Bumps Win32 submodule.

- - - - -
7dafa40c by Ben Gamari at 2025-07-09T09:44:45-04:00
base: Bump version to 4.22.0

Bumps various submodules.

- - - - -
ef03d8b8 by Rodrigo Mesquita at 2025-07-09T09:45:28-04:00
base: Export displayExceptionWithInfo

This function should be exposed from base following CLC#285

Approved change in CLC#344

Fixes #26058

- - - - -
01d3154e by Wen Kokke at 2025-07-10T17:06:36+01:00
Fix documentation for HEAP_PROF_SAMPLE_STRING

- - - - -
ac259c48 by Wen Kokke at 2025-07-10T17:06:38+01:00
Fix documentation for HEAP_PROF_SAMPLE_COST_CENTRE

- - - - -
2b4db9ba by Pi Delport at 2025-07-11T16:40:52-04:00
(Applicative docs typo: missing "one")

- - - - -
f707bab4 by Andreas Klebinger at 2025-07-12T14:56:16+01:00
Specialise: Improve specialisation by refactoring interestingDict

This MR addresses #26051, which concerns missed type-class specialisation.
The main payload of the MR is to completely refactor the key function
      `interestingDict` in GHC.Core.Opt.Specialise

The main change is that we now also look at the structure of the
dictionary we consider specializing on, rather than only the type.

See the big `Note [Interesting dictionary arguments]`

- - - - -
ca7a9d42 by Simon Peyton Jones at 2025-07-12T14:56:16+01:00
Treat tuple dictionaries uniformly; don't unbox them

See `Note [Do not unbox class dictionaries]` in DmdAnal.hs,
sep (DNB1).

This MR reverses the plan in #23398, which suggested a special case to
unbox tuple dictionaries in worker/wrapper.  But:

- This was the cause of a pile of complexity in the specialiser (#26158)

- Even with that complexity, specialision was still bad, very bad
  See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297

And it's entirely unnecessary!  Specialision works fine without
unboxing tuple dictionaries.

- - - - -
be7296c9 by Andreas Klebinger at 2025-07-12T14:56:16+01:00
Remove complex special case from the type-class specialiser

There was a pretty tricky special case in Specialise which is no
longer necessary.
   * Historical Note [Floating dictionaries out of cases]
   * #26158
   * #19747 https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297

This MR removes it.  Hooray.

- - - - -
4acf3a86 by Ben Gamari at 2025-07-15T05:46:32-04:00
configure: bump version to 9.15

- - - - -
45efaf71 by Teo Camarasu at 2025-07-15T05:47:13-04:00
rts/nonmovingGC: remove n_free

We remove the nonmovingHeap.n_free variable.

We wanted this to track the length of nonmovingHeap.free.
But this isn't possible to do atomically.

When this isn't accurate we can get a segfault by going past the end of
the list.

Instead, we just count the length of the list when we grab it in
nonmovingPruneFreeSegment.

Resolves #26186

- - - - -
c635f164 by Ben Gamari at 2025-07-15T14:05:54-04:00
configure: Drop probing of ld.gold

As noted in #25716, `gold` has been dropped from binutils-2.44.

Fixes #25716.

Metric Increase:
    size_hello_artifact_gzip
    size_hello_unicode_gzip
    ghc_prim_so

- - - - -
637bb538 by Ben Gamari at 2025-07-15T14:05:55-04:00
testsuite/recomp015: Ignore stderr

This is necessary since ld.bfd complains
that we don't have a .note.GNU-stack section,
potentially resulting in an executable stack.
- - - - -
d3cd4ec8 by Wen Kokke at 2025-07-15T14:06:39-04:00
Fix documentation for heap profile ID

- - - - -
73082769 by Ben Gamari at 2025-07-15T16:56:38-04:00
Bump win32-tarballs to v0.9
- - - - -
3b63b254 by Ben Gamari at 2025-07-15T16:56:39-04:00
rts/LoadArchive: Handle null terminated string tables

As of `llvm-ar` now emits filename tables terminated with null
characters instead of the usual POSIX `/\n` sequence.

Fixes #26150.

- - - - -
195f6527 by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: rename label so name doesn't conflict with param

- - - - -
63373b95 by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: Handle API set symbol versioning conflicts

- - - - -
48e9aa3e by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: Mark API set symbols as HIDDEN and correct symbol type

- - - - -
959e827a by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: Implement WEAK EXTERNAL undef redirection by target symbol name

- - - - -
65f19293 by Ben Gamari at 2025-07-15T16:56:39-04:00
rts/LoadArchive: Handle string table entries terminated with /

llvm-ar appears to terminate string table entries with `/\n` [1]. This
matters in the case of thin archives, since the filename is used. In the
past this worked since `llvm-ar` would produce archives with "small"
filenames when possible. However, now it appears to always use the
string table.

[1] https://github.com/llvm/llvm-project/blob/bfb686bb5ba503e9386dc899e1ebbe2488...

- - - - -
9cbb3ef5 by Ben Gamari at 2025-07-15T16:56:39-04:00
testsuite: Mark T12497 as fixed

Thanks to the LLVM toolchain update.

Closes #22694.

- - - - -
2854407e by Ben Gamari at 2025-07-15T16:56:39-04:00
testsuite: Accept new output of T11223_link_order_a_b_2_fail on Windows

The archive member number changed due to the fact that llvm-ar now uses a
string table.

- - - - -
28439593 by Ben Gamari at 2025-07-15T16:56:39-04:00
rts/linker/PEi386: Implement IMAGE_REL_AMD64_SECREL

This appears to now be used by libc++ as distributed by msys2.

- - - - -
2b053755 by Tamar Christina at 2025-07-15T16:56:39-04:00
rts: Cleanup merge resolution residue in lookupSymbolInDLL_PEi386 and make safe without dependent

- - - - -
e8acd2e7 by Wen Kokke at 2025-07-16T08:37:04-04:00
Remove the `profile_id` parameter from various RTS functions.

Various RTS functions took a `profile_id` parameter, intended to be used to
distinguish parallel heap profile breakdowns (e.g., `-hT` and `-hi`). However,
this feature was never implemented and the `profile_id` parameter was set to 0
throughout the RTS. This commit removes the parameter but leaves the hardcoded
profile ID in the functions that emit the encoded eventlog events as to not
change the protocol.

The affected functions are `traceHeapProfBegin`, `postHeapProfBegin`,
`traceHeapProfSampleString`, `postHeapProfSampleString`,
`traceHeapProfSampleCostCentre`, and `postHeapProfSampleCostCentre`.

- - - - -
76d392a2 by Wen Kokke at 2025-07-16T08:37:04-04:00
Make `traceHeapProfBegin` an init event.

- - - - -
bbaa44a7 by Peng Fan at 2025-07-16T16:50:42-04:00
NCG/LA64: Support finer-grained DBAR hints

For LA664 and newer uarchs, they have made finer granularity hints
available:

    Bit4: ordering or completion (0: completion, 1: ordering)
    Bit3: barrier for previous read (0: true, 1: false)
    Bit2: barrier for previous write (0: true, 1: false)
    Bit1: barrier for succeeding read (0: true, 1: false)
    Bit0: barrier for succeeding write (0: true, 1: false)

And not affect the existing models because other hints are treated
as 'dbar 0' there.

- - - - -
7da86e16 by Andreas Klebinger at 2025-07-16T16:51:25-04:00
Disable -fprof-late-overloaded-calls for join points.

Currently GHC considers cost centres as destructive to
join contexts. Or in other words this is not considered valid:

    join f x = ...
    in
              ... -> scc<tick> jmp

This makes the functionality of `-fprof-late-overloaded-calls` not feasible
for join points in general. We used to try to work around this by putting the
ticks on the rhs of the join point rather than around the jump. However beyond
the loss of accuracy this was broken for recursive join points as we ended up
with something like:

    rec-join f x = scc<tick> ... jmp f x

Which similarly is not valid as the tick once again destroys the tail call.
One might think we could limit ourselves to non-recursive tail calls and do
something clever like:

  join f x = scc<tick> ...
  in ... jmp f x

And sometimes this works! But sometimes the full rhs would look something like:

  join g x = ....
  join f x = scc<tick> ... -> jmp g x

Which, would again no longer be valid. I believe in the long run we can make
cost centre ticks non-destructive to join points. Or we could keep track of
where we are/are not allowed to insert a cost centre. But in the short term I will
simply disable the annotation of join calls under this flag.

- - - - -
7ee22fd5 by ARATA Mizuki at 2025-07-17T06:05:30-04:00
x86 NCG: Better lowering for shuffleFloatX4# and shuffleDoubleX2#

The new implementation

* make use of specialized instructions like (V)UNPCK{L,H}{PS,PD}, and
* do not require -mavx.

Close #26096

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

- - - - -
c6cd2da1 by Jappie Klooster at 2025-07-17T06:06:20-04:00
Update interact docs to explain about buffering

We need to tell the user to set to the
appropriate buffer format.
Otherwise, this function may get randomly stuck,
or just behave confusingly.

issue: https://gitlab.haskell.org/ghc/ghc/-/issues/26131

NB, I'm running this with cabal *NOT* ghci. ghci messes with buffering anyway.

```haskell
interaction :: String -> String
interaction "jappie" = "hi"
interaction "jakob" = "hello"
interaction x = "unkown input: " <> x

main :: IO ()
main = interact  interaction
```
so in my input (prefixed by `>`) I get:

```
...
jappie
unkown input: jappie

we confirmed later this was due to lack of \n matching.
Anyway movnig on to more unexpected stuff:

```haskell
main :: IO ()
main = do
  interact  (concatMap interaction . lines)

get's stuck forever.
actually `^D` (ctrl+d) unstucks it and runs all input as expected.
for example you can get:
```
...
sdfkds
fakdsf
unkown input: sdfkdsunkown input: fakdsf

This program works!
```haskell
interaction :: String -> String
interaction "jappie" = "hi \n"
interaction "jakob" = "hello \n"
interaction x = "unkown input: " &lt;> x &lt;> "\n"

main :: IO ()
main = do
  interact  (concatMap interaction . lines)

the reason is that linebuffering is set for both in and output by default.
so lines eats the input lines, and all the \n postfixes make sure the buffer
is put out.

- - - - -
9fa590a6 by Zubin Duggal at 2025-07-17T06:07:03-04:00
fetch_gitlab: Ensure we copy users_guide.pdf and Haddock.pdf to the release docs directory

Fixes #24093

- - - - -
cc650b4b by Andrew Lelechenko at 2025-07-17T12:30:24-04:00
Add Data.List.NonEmpty.mapMaybe

As per https://github.com/haskell/core-libraries-committee/issues/337

- - - - -
360fa82c by Duncan Coutts at 2025-07-17T12:31:14-04:00
base: Deprecate GHC.Weak.Finalize.runFinalizerBatch

https://github.com/haskell/core-libraries-committee/issues/342

- - - - -
f4e8466c by Alan Zimmerman at 2025-07-17T12:31:55-04:00
EPA: Update exact printing based on GHC 9.14 tests

As a result of migrating the GHC ghc-9.14 branch tests to
ghc-exactprint in
https://github.com/alanz/ghc-exactprint/tree/ghc-9.14, a couple of
discrepancies were picked up

- The opening paren for a DefaultDecl was printed in the wrong place
- The import declaration level specifiers were not printed.

This commit adds those fixes, and some tests for them.
The tests brought to light that the ImportDecl ppr instance had not
been updated for level specifiers, so it updates that too.

- - - - -
8b731e3c by Matthew Pickering at 2025-07-21T13:36:43-04:00
level imports: Fix infinite loop with cyclic module imports

I didn't anticipate that downsweep would run before we checked for
cyclic imports. Therefore we need to use the reachability function which
handles cyclic graphs.

Fixes #26087

- - - - -
d751a9f1 by Pierre Thierry at 2025-07-21T13:37:28-04:00
Fix documentation about deriving from generics

- - - - -
f8d9d016 by Andrew Lelechenko at 2025-07-22T21:13:28-04:00
Fix issues with toRational for types capable to represent infinite and not-a-number values

This commit fixes all of the following pitfalls:
...
toRational (read "Infinity" :: Double)
179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216 % 1
toRational (read "NaN" :: Double)
269653970229347386159395778618353710042696546841345985910145121736599013708251444699062715983611304031680170819807090036488184653221624933739271145959211186566651840137298227914453329401869141179179624428127508653257226023513694322210869665811240855745025766026879447359920868907719574457253034494436336205824 % 1
...
realToFrac (read "NaN" :: Double) -- With -O0
Infinity
realToFrac (read "NaN" :: Double) -- With -O1
NaN
...
realToFrac (read "NaN" :: Double) :: CDouble
Infinity
realToFrac (read "NaN" :: CDouble) :: Double
Infinity
Implements https://github.com/haskell/core-libraries-committee/issues/338

- - - - -
5dabc718 by Zubin Duggal at 2025-07-22T21:14:10-04:00
haddock: Don't warn about missing link destinations for derived names.

Fixes #26114

- - - - -
9c3a0937 by Matthew Pickering at 2025-07-22T21:14:52-04:00
template haskell: use a precise condition when implicitly lifting

Implicit lifting corrects a level error by replacing references to `x`
with `$(lift x)`, therefore you can use a level `n` binding at level `n
+ 1`, if it can be lifted.

Therefore, we now have a precise check that the use level is 1 more than
the bind level.

Before this bug was not observable as you only had 0 and 1 contexts but
it is easily evident when using explicit level imports.

Fixes #26088

- - - - -
5144b22f by Andreas Klebinger at 2025-07-22T21:15:34-04:00
Add since tag and more docs for do-clever-arg-eta-expansion

Fixes #26113

- - - - -
c865623b by Andreas Klebinger at 2025-07-22T21:15:34-04:00
Add since tag for -fexpose-overloaded-unfoldings

Fixes #26112

- - - - -
49a44ab7 by Simon Hengel at 2025-07-23T17:59:55+07:00
Refactor GHC.Driver.Errors.printMessages

- - - - -
84711c39 by Simon Hengel at 2025-07-23T18:27:34+07:00
Respect `-fdiagnostics-as-json` for error messages from pre-processors

(fixes #25480)

- - - - -
d046b5ab by Simon Hengel at 2025-07-24T06:12:05-04:00
Include the rendered message in -fdiagnostics-as-json output

This implements #26173.

- - - - -
d2b89603 by Ben Gamari at 2025-07-24T06:12:47-04:00
rts/Interpreter: Factor out ctoi tuple info tables into data

Instead of a massive case let's put this into data which we can reuse
elsewhere.

- - - - -
4bc78496 by Sebastian Graf at 2025-07-24T16:19:34-04:00
CprAnal: Detect recursive newtypes (#25944)

While `cprTransformDataConWork` handles recursive data con workers, it
did not detect the case when a newtype is responsible for the recursion.
This is now detected in the `Cast` case of `cprAnal`.

The same reproducer made it clear that `isRecDataCon` lacked congruent
handling for `AppTy` and `CastTy`, now fixed.

Furthermore, the new repro case T25944 triggered this bug via an
infinite loop in `cprFix`, caused by the infelicity in `isRecDataCon`.
While it should be much less likely to trigger such an infinite loop now
that `isRecDataCon` has been fixed, I made sure to abort the loop after
10 iterations and emitting a warning instead.

Fixes #25944.

- - - - -
0a583689 by Sylvain Henry at 2025-07-24T16:20:26-04:00
STM: don't create a transaction in the rhs of catchRetry# (#26028)

We don't need to create a transaction for the rhs of (catchRetry#)
because contrary to the lhs we don't need to abort it on retry. Moreover
it is particularly harmful if we have code such as (#26028):

  let cN = readTVar vN >> retry
      tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
  atomically tree

Because it will stack transactions for the rhss and the read-sets of all
the transactions will be iteratively merged in O(n^2) after the
execution of the most nested retry.

- - - - -
a49eca26 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Renaming around predicate types

.. we were (as it turned out) abstracting over
type-class selectors in SPECIALISATION rules!

Wibble isEqPred

- - - - -
f80375dd by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Refactor of Specialise.hs

This patch just tidies up `specHeader` a bit, removing one
of its many results, and adding some comments.

No change in behaviour.

Also add a few more `HasDebugCallStack` contexts.

- - - - -
1bd12371 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Improve treatment of SPECIALISE pragmas -- again!

This MR does another major refactor of the way that SPECIALISE
pragmas work, to fix #26115, #26116, #26117.

* We now /always/ solve forall-constraints in an all-or-nothing way.
  See Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve

  This means we might have unsolved quantified constraints, which need
  to be reported.  See `inert_insts` in `getUnsolvedInerts`.

* I refactored the short-cut solver for type classes to work by
  recursively calling the solver rather than by having a little baby
  solver that kept being not clever enough.
  See Note [Shortcut solving] in GHC.Tc.Solver.Dict

* I totally rewrote the desugaring of SPECIALISE pragmas, again.
  The new story is in Note [Desugaring new-form SPECIALISE pragmas]
  in GHC.HsToCore.Binds

  Both old-form and new-form SPECIALISE pragmas now route through the same
  function `dsSpec_help`.   The tricky function `decomposeRuleLhs` is now used only
  for user-written RULES, not for SPECIALISE pragmas.

* I improved `solveOneFromTheOther` to account for rewriter sets. Previously
  it would solve a non-rewritten dict from a rewritten one.  For equalities
  we were already dealing with this, in

Some incidental refactoring

* A small refactor: `ebv_tcvs` in `EvBindsBar` now has a list of coercions, rather
  than a set of tyvars.  We just delay taking the free vars.

* GHC.Core.FVs.exprFVs now returns /all/ free vars.
  Use `exprLocalFVs` for Local vars.
  Reason: I wanted another variant for /evidence/ variables.

* Ues `EvId` in preference to `EvVar`.  (Evidence variables are always Ids.)
  Rename `isEvVar` to `isEvId`.

* I moved `inert_safehask` out of `InertCans` and into `InertSet` where it
  more properly belongs.

Compiler-perf changes:
  * There was a palpable bug (#26117) which this MR fixes in
    newWantedEvVar, which bypassed all the subtle overlapping-Given
    and shortcutting logic.  (See the new `newWantedEvVar`.)  Fixing this
    but leads to extra dictionary bindings; they are optimised away quickly
    but they made CoOpt_Read allocate 3.6% more.

  * Hpapily T15164 improves.

  * The net compiler-allocation change is 0.0%

Metric Decrease:
    T15164
Metric Increase:
    CoOpt_Read
    T12425

- - - - -
953fd8f1 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Solve forall-constraints immediately, or not at all

This MR refactors the constraint solver to solve forall-constraints immediately,
rather than emitting an implication constraint to be solved later.

The most immediate motivation was that when solving quantified constraints
in SPECIALISE pragmas, we really really don't want to leave behind half-
solved implications.  Also it's in tune with the approach of the new
short-cut solver, which recursively invokes the solver.

It /also/ saves quite a bit of plumbing; e.g

  - The `wl_implics` field of `WorkList` is gone,

  - The types of `solveSimpleWanteds` and friends are simplified.

  - An EvFun contains binding, rather than an EvBindsVar ref-cell that
    will in the future contain bindings.  That makes `evVarsOfTerm`
    simpler.  Much nicer.

It also improves error messages a bit.

All described in Note [Solving a Wanted forall-constraint] in
GHC.Tc.Solver.Solve.

One tiresome point: in the tricky case of `inferConstraintsCoerceBased`
we make a forall-constraint.  This we /do/ want to partially solve, so
we can infer a suitable context. (I'd be quite happy to force the user to
write a context, bt I don't want to change behavior.)  So we want to generate
an /implication/ constraint in `emitPredSpecConstraints` rather than a
/forall-constraint/ as we were doing before.  Discussed in (WFA3) of
the above Note.

Incidental refactoring

* `GHC.Tc.Deriv.Infer.inferConstraints` was consulting the state monad for
  the DerivEnv that the caller had just consulted.  Nicer to pass it as an
  argument I think, so I have done that.  No change in behaviour.

- - - - -
6921ab42 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Remove duplicated code in Ast.hs for evTermFreeVars

This is just a tidy up.

- - - - -
1165f587 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00
Small tc-tracing changes only

- - - - -
0776ffe0 by Simon Hengel at 2025-07-26T04:54:20-04:00
Respect `-fdiagnostics-as-json` for core diagnostics (see #24113)

- - - - -
cc1116e0 by Andrew Lelechenko at 2025-07-26T04:55:01-04:00
docs: add since pragma to Data.List.NonEmpty.mapMaybe

- - - - -
ee2dc248 by Simon Hengel at 2025-07-31T06:25:35-04:00
Update comments on `OptKind` to reflect the code reality

- - - - -
b029633a by Wen Kokke at 2025-07-31T06:26:21-04:00
rts: Disable --eventlog-flush-interval unless compiled with -threaded.

This commit fixes issue #26222:
Using --eventlog-flush-interval with the non-threaded RTS leads to eventlog corruption.
https://gitlab.haskell.org/ghc/ghc/-/issues/26222

This commit makes three changes when code is compiled against the non-threaded RTS:

1. It disables the --eventlog-flush-interval flag.
2. It disables the documentation for the --eventlog-flush-interval flag.
3. It disables the relevant state from RtsConfig and code from Timer.
4. It updates the entry for --eventlog-flush-interval in the users guide.

- - - - -
31159f1d by Wen Kokke at 2025-07-31T06:26:21-04:00
rts: Split T20006 into tests with and without -threaded

- - - - -
618687ef by Simon Hengel at 2025-07-31T06:27:03-04:00
docs/users_guide/win32-dlls.rst: Remove references to `readline`

- - - - -
083e40f1 by Rodrigo Mesquita at 2025-08-01T04:38:23-04:00
debugger: Uniquely identify breakpoints by internal id

Since b85b11994e0130ff2401dd4bbdf52330e0bcf776 (support inlining
breakpoints), a breakpoint has been identified at runtime by *two* pairs
of <module,index>.

- The first, aka a 'BreakpointId', uniquely identifies a breakpoint in
  the source of a module by using the Tick index. A Tick index can index
  into ModBreaks.modBreaks_xxx to fetch source-level information about
  where that tick originated.

    - When a user specifies e.g. a line breakpoint using :break, we'll reverse
      engineer what a Tick index for that line
    - We update the `BreakArray` of that module (got from the
      LoaderState) at that tick index to `breakOn`.
    - A BCO we can stop at is headed by a BRK_FUN instruction. This
      instruction stores in an operand the `tick index` it is associated
      to. We look it up in the associated `BreakArray` (also an operand)
      and check wheter it was set to `breakOn`.

- The second, aka the `ibi_info_mod` + `ibi_info_ix` of the
  `InternalBreakpointId`, uniquely index into the `imodBreaks_breakInfo`
  -- the information we gathered during code generation about the
  existing breakpoint *ocurrences*.

  - Note that with optimisation there may be many occurrences of the
    same source-tick-breakpoint across different modules. The
    `ibi_info_ix` is unique per occurrence, but the `bi_tick_ix` may be
    shared. See Note [Breakpoint identifiers] about this.

  - Note that besides the tick ids, info ids are also stored in
    `BRK_FUN` so the break handler can refer to the associated
    `CgBreakInfo`.

In light of that, the driving changes come from the desire to have the
info_id uniquely identify the breakpoint at runtime, and the source tick
id being derived from it:

- An InternalBreakpointId should uniquely identify a breakpoint just
  from the code-generation identifiers of `ibi_info_ix` and `ibi_info_mod`.
  So we drop `ibi_tick_mod` and `ibi_tick_ix`.
- A BRK_FUN instruction need only record the "internal breakpoint id",
  not the tick-level id.
  So we drop the tick mod and tick index operands.
- A BreakArray should be indexed by InternalBreakpointId rather than
  BreakpointId

That means we need to do some more work when setting a breakpoint.
Specifically, we need to figure out the internal ids (occurrences of a
breakpoint) from the source-level BreakpointId we want to set the
breakpoint at (recall :break refers to breaks at the source level).

Besides this change being an improvement to the handling of breakpoints
(it's clearer to have a single unique identifier than two competing
ones), it unlocks the possibility of generating "internal" breakpoints
during Cg (needed for #26042).
It should also be easier to introduce multi-threaded-aware `BreakArrays`
following this change (needed for #26064).

Se also the new Note [ModBreaks vs InternalModBreaks]

On i386-linux:

-------------------------
Metric Decrease:
    interpreter_steplocal
-------------------------

- - - - -
bf03bbaa by Simon Hengel at 2025-08-01T04:39:05-04:00
Don't use MCDiagnostic for `ghcExit`

This changes the error message of `ghcExit` from

```
<no location info>: error:
Compilation had errors

```
to
```

Compilation had errors

```

- - - - -
a889ec75 by Simon Hengel at 2025-08-01T04:39:05-04:00
Respect `-fdiagnostics-as-json` for driver diagnostics (see #24113)

- - - - -
81577fe7 by Ben Gamari at 2025-08-02T04:29:39-04:00
configure: Allow override of CrossCompiling

As noted in #26236, the current inference logic is a bit simplistic. In
particular, there are many cases (e.g. building for a new libc) where
the target and host triples may differ yet we are still able to run the
produced artifacts as native code.

Closes #26236.

- - - - -
01136779 by Andreas Klebinger at 2025-08-02T04:30:20-04:00
rts: Support COFF BigObj files in archives.

- - - - -
1f9e4f54 by Stephen Morgan at 2025-08-03T15:14:08+10:00
refactor: Modify Data.List.sortOn to use (>) instead of compare. (#26184)

This lets a more efficient (>) operation be used if one exists.

This is technically a breaking change for malformed Ord instances, where
x > y is not equivalent to compare x y == GT.

Discussed by the CLC in issue #332: https://github.com/haskell/core-libraries-committee/issues/332

- - - - -
4f6bc9cf by fendor at 2025-08-04T17:50:06-04:00
Revert "base: Expose Backtraces constructor and fields"

This reverts commit 17db44c5b32fff82ea988fa4f1a233d1a27bdf57.

- - - - -
bcdec657 by Zubin Duggal at 2025-08-05T10:37:29+05:30
compiler: Export a version of `newNameCache` that is not prone to footguns.
`newNameCache` must be initialized with both a non-"reserved" unique tag, as well
as a list of known key names. Failing to do so results in hard to debug unique conflicts.

It is difficult for API users to tell which unique tags are safe to use. So instead of leaving
this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed
non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations
of the compiler.

The original version of `newNameCache` is now exported as `newNameCache'` for advanced users.

We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in
functionality by `newNameCache` and `newNameCache'`.

Fixes #26135 and #26055

- - - - -
57d3b4a8 by Andrew Lelechenko at 2025-08-05T18:36:31-04:00
hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2

In line with #25693 we should use GHC 9.10 as a boot compiler,
while Hadrian stack.yaml was stuck on GHC 9.6.

- - - - -
c2a78cea by Peng Fan at 2025-08-05T18:37:27-04:00
NCG/LA64: implement atomic write with finer-grained DBAR hints

Signed-off-by: Peng Fan <fanpeng@loongson.cn>

- - - - -
95231c8e by Teo Camarasu at 2025-08-06T08:35:58-04:00
CODEOWNERS: add CLC as codeowner of base

We also remove hvr, since I think he is no longer active
- - - - -
77df0ded by Andrew Lelechenko at 2025-08-06T08:36:39-04:00
Bump submodule text to 2.1.3

- - - - -
8af260d0 by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00
docs: fix internal import in getopt examples

This external-facing doc example shouldn't mention GHC internals when
using 'fromMaybe'.

- - - - -
69cc16ca by Marc Scholten at 2025-08-06T15:51:28-04:00
README: Add note on ghc.nix

- - - - -
93a2f450 by Daniel Díaz at 2025-08-06T15:52:14-04:00
Link to the "Strict Bindings" docs from the linear types docs

Strict Bidings are relevant for the kinds of multiplicity annotations
linear lets support.

- - - - -
246b7853 by Matthew Pickering at 2025-08-07T06:58:30-04:00
level imports: Check the level of exported identifiers

The level imports specification states that exported identifiers have to
be at level 0. This patch adds the requird level checks that all
explicitly mentioned identifiers occur at level 0.

For implicit export specifications (T(..) and module B), only level 0
identifiers are selected for re-export.

ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705

Fixes #26090

- - - - -
358bc4fc by fendor at 2025-08-07T06:59:12-04:00
Bump GHC on darwin CI to 9.10.1

- - - - -
1903ae35 by Matthew Pickering at 2025-08-07T12:21:10+01:00
ipe: Place strings and metadata into specific .ipe section

By placing the .ipe metadata into a specific section it can be stripped
from the final binary if desired.

```
objcopy --remove-section .ipe <binary>
upx <binary>
```

Towards #21766

- - - - -
c80dd91c by Matthew Pickering at 2025-08-07T12:22:42+01:00
ipe: Place magic word at the start of entries in the .ipe section

The magic word "IPE\nIPE\n" is placed at the start of .ipe sections,
then if the section is stripped, we can check whether the section starts
with the magic word or not to determine whether there is metadata
present or not.

Towards #21766

- - - - -
cab42666 by Matthew Pickering at 2025-08-07T12:22:42+01:00
ipe: Use stable IDs for IPE entries

IPEs have historically been indexed and reported by their address.
This makes it impossible to compare profiles between runs, since the
addresses may change (due to ASLR) and also makes it tricky to separate
out the IPE map from the binary.

This small patch adds a stable identifier for each IPE entry.

The stable identifier is a single 64 bit word. The high-bits are a
per-module identifier and the low bits identify which entry in each
module.

1. When a node is added into the IPE buffer it is assigned a unique
   identifier from an incrementing global counter.
2. Each entry already has an index by it's position in the
   `IpeBufferListNode`.

The two are combined together by the `IPE_ENTRY_KEY` macro.

Info table profiling uses the stable identifier rather than the address
of the info table.

The benefits of this change are:

* Profiles from different runs can be easily compared
* The metadata can be extracted from the binary (via the eventlog for
  example) and then stripped from the executable.

Fixes #21766

- - - - -
2860a9a5 by Simon Peyton Jones at 2025-08-07T20:29:18-04:00
In TcSShortCut, typechecker plugins should get empty Givens

Solving in TcShortCut mode means /ignoring the Givens/. So we
should not pass them to typechecker plugins!

Fixes #26258.

This is a fixup to the earlier MR:

    commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Mon Jul 21 10:04:49 2025 +0100

        Improve treatment of SPECIALISE pragmas -- again!

- - - - -
2157db2d by sterni at 2025-08-08T15:32:39-04:00
hadrian: enable terminfo if --with-curses-* flags are given

The GHC make build system used to support WITH_TERMINFO in ghc.mk which
allowed controlling whether to build GHC with terminfo or not. hadrian
has replaced this with a system where this is effectively controlled by
the cross-compiling setting (the default WITH_TERMINFO value was bassed
on CrossCompiling, iirc).

This behavior is undesireable in some cases and there is not really a
good way to work around it. Especially for downstream packagers,
modifying this via UserSettings is not really feasible since such a
source file has to be kept in sync with Settings/Default.hs manually
since it can't import Settings.Default or any predefined Flavour
definitions.

To avoid having to add a new setting to cfg/system.config and/or a new
configure flag (though I'm happy to implement both if required), I've
chosen to take --with-curses-* being set explicitly as an indication
that the user wants to have terminfo enabled. This would work for
Nixpkgs which sets these flags [1] as well as haskell.nix [2] (which
goes to some extreme measures [3] [4] to force terminfo in all scenarios).

In general, I'm an advocate for making the GHC build be the same for
native and cross insofar it is possible since it makes packaging GHC and
Haskell related things while still supporting cross much less
compilicated. A more minimal GHC with reduced dependencies should
probably be a specific flavor, not the default.

Partially addresses #26288 by forcing terminfo to be built if the user
explicitly passes configure flags related to it. However, it isn't built
by default when cross-compiling yet nor is there an explicit way to
control the package being built.

[1]: https://github.com/NixOS/nixpkgs/blob/3a7266fcefcb9ce353df49ba3f292d06443760...
[2]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4...
[3]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4...
[4]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4...

- - - - -
b3c31488 by David Feuer at 2025-08-08T15:33:21-04:00
Add default QuasiQuoters

Add `defaultQuasiQuoter` and `namedDefaultQuasiQuoter` to make it easier
to write `QuasiQuoters` that give helpful error messages when they're
used in inappropriate contexts.

Closes #24434.

- - - - -
03555ed8 by Sylvain Henry at 2025-08-10T22:20:57-04:00
Handle non-fractional CmmFloats in Cmm's CBE (#26229)

Since f8d9d016305be355f518c141f6c6d4826f2de9a2, toRational for Float and
Double converts float's infinity and NaN into Rational's infinity and
NaN (respectively 1%0 and 0%0).

Cmm CommonBlockEliminator hashing function needs to take these values
into account as they can appear as literals now. See added testcase.

- - - - -
6c956af3 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00
Fix extensions list in `DoAndIfThenElse` docs

- - - - -
6dc420b1 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00
Document status of `RelaxedPolyRec` extension

This adds a brief extension page explaining the status of the
`RelaxedPolyRec` extension. The behaviour of this mode is already
explained elsewhere, so this page is mainly for completeness so that
various lists of extensions have somewhere to point to for this flag.

Fixes #18630

- - - - -
18036d52 by Simon Peyton Jones at 2025-08-11T11:31:20-04:00
Take more care in zonkEqTypes on AppTy/AppTy

This patch fixes #26256.

See Note [zonkEqTypes and the PKTI] in GHC.Tc.Solver.Equality

- - - - -
c8d76a29 by Zubin Duggal at 2025-08-11T11:32:02-04:00
ci: upgrade bootstrap compiler on windows to 9.10.1

- - - - -
34fc50c1 by Ben Gamari at 2025-08-11T13:36:25-04:00
Kill IOPort#

This type is unnecessary, having been superceded by `MVar` and a rework
of WinIO's blocking logic.

See #20947.

See https://github.com/haskell/core-libraries-committee/issues/213.

- - - - -
56b32c5a by sheaf at 2025-08-12T10:00:19-04:00
Improve deep subsumption

This commit improves the DeepSubsumption sub-typing implementation
in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back
to unification.

For example, we now are properly able to prove the subtyping relationship

  ((∀ a. a->a) -> Int) -> Bool  <=  β[tau] Bool

for an unfilled metavariable β. In this case (with an AppTy on the right),
we used to fall back to unification. No longer: now, given that the LHS
is a FunTy and that the RHS is a deep rho type (does not need any instantiation),
we try to make the RHS into a FunTy, viz.

  β := (->) γ

We can then continue using covariance & contravariance of the function
arrow, which allows us to prove the subtyping relationship, instead of
trying to unify which would cause us to error out with:

  Couldn't match expected type ‘β’ with actual type ‘(->) ((∀ a. a -> a) -> Int)

See Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.

The other main improvement in this patch concerns type inference.
The main subsumption logic happens (before & after this patch) in
GHC.Tc.Gen.App.checkResultTy. However, before this patch, all of the
DeepSubsumption logic only kicked in in 'check' mode, not in 'infer' mode.

This patch adds deep instantiation in the 'infer' mode of checkResultTy
when we are doing deep subsumption, which allows us to accept programs
such as:

  f :: Int -> (forall a. a->a)
  g :: Int -> Bool -> Bool

  test1 b =
    case b of
      True  -> f
      False -> g
  test2 b =
    case b of
      True  -> g
      False -> f

See Note [Deeply instantiate in checkResultTy when inferring].

Finally, we add representation-polymorphism checks to ensure that the
lambda abstractions we introduce when doing subsumption obey the
representation polymorphism invariants of Note [Representation polymorphism invariants]
in GHC.Core. See Note [FunTy vs FunTy case in tc_sub_type_deep].
This is accompanied by a courtesy change to `(<.>) :: HsWrapper -> HsWrapper -> HsWrapper`,
adding the equation:

  WpCast c1 <.> WpCast c2 = WpCast (c1 `mkTransCo` c2)

This is useful because mkWpFun does not introduce an eta-expansion when
both of the argument & result wrappers are casts; so this change allows
us to avoid introducing lambda abstractions when casts suffice.

Fixes #26225

- - - - -
d175aff8 by Sylvain Henry at 2025-08-12T10:01:31-04:00
Add regression test for #18619

- - - - -
a3983a26 by Sylvain Henry at 2025-08-12T10:02:20-04:00
RTS: remove some TSAN annotations (#20464)

Use RELAXED_LOAD_ALWAYS macro instead.

- - - - -
0434af81 by Ben Gamari at 2025-08-12T10:03:02-04:00
Bump time submodule to 1.15

Also required bumps of Cabal, directory, and hpc.

- - - - -
62899117 by Florian Ragwitz at 2025-08-13T21:01:34-04:00
Extend record-selector usage ticking to all binds using a record field

This extends the previous handling of ticking for RecordWildCards and
NamedFieldPuns to all var bindings that involve record selectors.

Note that certain patterns such as `Foo{foo = 42}` will currently not tick the
`foo` selector, as ticking is triggered by `HsVar`s.

Closes #26191.

- - - - -
b37b3af7 by Florian Ragwitz at 2025-08-13T21:01:34-04:00
Add release notes for 9.16.1 and move description of latest HPC changes there.

- - - - -
a5e4b7d9 by Ben Gamari at 2025-08-13T21:02:18-04:00
rts: Clarify rationale for undefined atomic wrappers

Since c06e3f46d24ef69f3a3d794f5f604cb8c2a40cbc the RTS has declared
various atomic operation wrappers defined by ghc-internal as undefined.
While the rationale for this isn't clear from the commit message, I
believe that this is necessary due to the unregisterised backend.
Specifically, the code generator will reference these symbols when
compiling RTS Cmm sources.

- - - - -
50842f83 by Andreas Klebinger at 2025-08-13T21:03:01-04:00
Make unexpected LLVM versions a warning rather than an error.

Typically a newer LLVM version *will* work so erroring out if
a user uses a newer LLVM version is too aggressive.

Fixes #25915

- - - - -
c91e2650 by fendor at 2025-08-13T21:03:43-04:00
Store `StackTrace` and `StackSnapshot` in `Backtraces`

Instead of decoding the stack traces when collecting the `Backtraces`,
defer this decoding until actually showing the `Backtraces`.
This allows users to customise how `Backtraces` are displayed by
using a custom implementation of `displayExceptionWithInfo`, overwriting
the default implementation for `Backtraces` (`displayBacktraces`).

- - - - -
dee28cdd by fendor at 2025-08-13T21:03:43-04:00
Allow users to customise the collection of exception annotations

Add a global `CollectExceptionAnnotationMechanism` which determines how
`ExceptionAnnotation`s are collected upon throwing an `Exception`.

This API is exposed via `ghc-experimental`.

By overriding how we collect `Backtraces`, we can control how the
`Backtraces` are displayed to the user by newtyping `Backtraces` and
giving a different instance for `ExceptionAnnotation`.

A concrete use-case for this feature is allowing us to experiment with
alternative stack decoders, without having to modify `base`, which take
additional information from the stack frames.

This commit does not modify how `Backtraces` are currently
collected or displayed.

- - - - -
66024722 by fendor at 2025-08-13T21:03:43-04:00
Expose Backtraces internals from ghc-experimental

Additionally, expose the same API `base:Control.Exception.Backtrace`
to make it easier to use as a drop-in replacement.

- - - - -
a766286f by Reed Mullanix at 2025-08-13T21:04:36-04:00
ghc-internal: Fix naturalAndNot for NB/NS case

When the first argument to `naturalAndNot` is larger than a `Word` and the second is `Word`-sized, `naturalAndNot` will truncate the
result:

```
...
...
...
naturalAndNot ((2 ^ 65) .|. (2 ^ 3)) (2 ^ 3)
0

In contrast, `naturalAndNot` does not truncate when both arguments are larger than a `Word`, so this appears to be a bug.
Luckily, the fix is pretty easy: we just need to call `bigNatAndNotWord#` instead of truncating.

Fixes #26230

- - - - -
3506fa7d by Simon Hengel at 2025-08-13T21:05:18-04:00
Report -pgms as a deprecated flag

(instead of reporting an unspecific warning)

Before:

    on the commandline: warning:
        Object splitting was removed in GHC 8.8

After:

    on the commandline: warning: [GHC-53692] [-Wdeprecated-flags]
        -pgms is deprecated: Object splitting was removed in GHC 8.8

- - - - -
51c701fe by Zubin Duggal at 2025-08-13T21:06:00-04:00
testsuite: Be more permissive when filtering out GNU_PROPERTY_TYPE linker warnings

The warning text is slightly different with ld.bfd.

Fixes #26249

- - - - -
dfe6f464 by Simon Hengel at 2025-08-13T21:06:43-04:00
Refactoring: Don't misuse `MCDiagnostic` for lint messages

`MCDiagnostic` is meant to be used for compiler diagnostics.

Any code that creates `MCDiagnostic` directly, without going through
`GHC.Driver.Errors.printMessage`, side steps `-fdiagnostics-as-json`
(see e.g. !14475, !14492 !14548).

To avoid this in the future I want to control more narrowly who creates
`MCDiagnostic` (see #24113).

Some parts of the compiler use `MCDiagnostic` purely for formatting
purposes, without creating any real compiler diagnostics.  This change
introduces a helper function, `formatDiagnostic`, that can be used in
such cases instead of constructing `MCDiagnostic`.

- - - - -
a8b2fbae by Teo Camarasu at 2025-08-13T21:07:24-04:00
rts: ensure MessageBlackHole.link is always a valid closure

We turn a MessageBlackHole into an StgInd in wakeBlockingQueue().
Therefore it's important that the link field, which becomes the
indirection field, always points to a valid closure.

It's unclear whether it's currently possible for the previous behaviour
to lead to a crash, but it's good to be consistent about this invariant nonetheless.

Co-authored-by: Andreas Klebinger &lt;klebinger.andreas@gmx.at>

- - - - -
4021181e by Teo Camarasu at 2025-08-13T21:07:24-04:00
rts: spin if we see a WHITEHOLE in messageBlackHole

When a BLACKHOLE gets cancelled in raiseAsync, we indirect to a THUNK.
GC can then shortcut this, replacing our BLACKHOLE with a fresh THUNK.

This THUNK is not guaranteed to have a valid indirectee field.

If at the same time, a message intended for the previous BLACKHOLE is
processed and concurrently we BLACKHOLE the THUNK, thus temporarily
turning it into a WHITEHOLE, we can get a segfault, since we look at the
undefined indirectee field of the THUNK

The fix is simple: spin if we see a WHITEHOLE, and it will soon be
replaced with a valid BLACKHOLE.

Resolves #26205

- - - - -
1107af89 by Oleg Grenrus at 2025-08-13T21:08:06-04:00
Allow defining HasField instances for naughty fields

Resolves #26295

... as HasField solver doesn't solve for fields with "naughty"
selectors, we could as well allow defining HasField instances for these
fields.

- - - - -
020e7587 by Sylvain Henry at 2025-08-13T21:09:00-04:00
Fix Data.List unqualified import warning

- - - - -
fd811ded by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Make injecting implicit bindings into its own pass

Previously we were injecting "impliicit bindings" (data constructor
worker and wrappers etc)

  - both at the end of CoreTidy,
  - and at the start of CorePrep

This is unpleasant and confusing.  This patch puts it it its own pass,
addImplicitBinds, which runs between the two.

The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/
TyCons, not just the ones for algebraic data types.  That change ripples
through to
     - corePrepPgm
     - doCodeGen
     - byteCodeGen
All take [TyCon] which includes all TyCons

- - - - -
9bd7fcc5 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Implement unary classes

The big change is described exhaustively in

   Note [Unary class magic] in GHC.Core.TyCon

Other changes

* We never unbox class dictionaries in worker/wrapper.  This has been true for some
  time now, but the logic is now centralised in functions in
  GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg`
  See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils.

* Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels.
  I can't remember if I actually changed any behaviour here, but if so it's
  only in a corner cases.

* Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning
  True for (##).

* Remove redundant Role argument to `liftCoSubstWithEx`.  It was always
  Representational.

* I refactored evidence generation in the constraint solver:
  * Made GHC.Tc.Types.Evidence contain better abstactions for evidence
    generation.
  * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents
    elsewhere. It wasn't paying its way.
  * Made evidence for implicit parameters go via a proper abstraction.

* Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk]
  This fixes a slowdown in `countdownEffectfulDynLocal`
  in the `effectful` library.

Smaller things

* Rename `isDataTyCon` to `isBoxedDataTyCon`.
* GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role,
  so I baked that into the function and removed the argument.
* Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling
  `not isNewTyCon` at the call sites; more explicit.
* Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its
  behaviour
* Moved `decomposeIPPred` to GHC.Core.Predicate

Compile time performance changes:
  geo. mean        +0.1%
    minimum        -6.8%
    maximum       +14.4%

The +14% one is in T21839c, where it seems that a bit more inlining
is taking place.  That seems acceptable; and the average change is small

Metric Decrease:
    LargeRecord
    T12227
    T12707
    T16577
    T21839r
    T5642
Metric Increase:
    T15164
    T21839c
    T3294
    T5321FD
    T5321Fun
    WWRec

- - - - -
b4075d71 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Slight improvement to pre/postInlineUnconditionally

Avoids an extra simplifier iteration

- - - - -
9e443596 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Fix a long-standing assertion error in normSplitTyConApp_maybe

- - - - -
91310ad0 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Add comment to coercion optimiser

- - - - -
5b841d82 by Teo Camarasu at 2025-08-14T17:57:56-04:00
template-haskell: move some identifiers from ghc-internal to template-haskell

These identifiers are not used internally by the compiler. Therefore we
have no reason for them to be in ghc-internal.

By moving them to template-haskell, we benefit from it being easier to
change them and we avoid having to build them in stage0.

Resolves #26048

- - - - -
33e2c7e5 by Teo Camarasu at 2025-08-14T17:57:56-04:00
template-haskell: transfer $infix note to public module

This Haddock note should be in the public facing module

- - - - -
2a411fc4 by Sylvain Henry at 2025-08-14T17:59:09-04:00
JS: export HEAP8 symbol (#26290)

Newer Emscripten requires this.

- - - - -
248f78ca by Ben Gamari at 2025-08-14T17:59:51-04:00
users-guide: Drop the THREAD_RUNNABLE event

As of f361281c89fbce42865d8b8b27b0957205366186 it is no longer emitted.
- - - - -
706d33e3 by Recursion Ninja at 2025-08-15T04:12:12-04:00
Resolving issues #20645 and #26109

Correctly sign extending and casting smaller bit width types for LLVM operations:

  - bitReverse8#
  - bitReverse16#
  - bitReverse32#
  - byteSwap16#
  - byteSwap32#
  - pdep8#
  - pdep16#
  - pext8#
  - pext16#

- - - - -
1cdc6f46 by Cheng Shao at 2025-08-15T04:12:56-04:00
hadrian: enforce have_llvm=False for wasm32/js

This patch fixes hadrian to always pass have_llvm=False to the
testsuite driver for wasm32/js targets. These targets don't really
support the LLVM backend, and the optllvm test way doesn't work. We
used to special-case wasm32/js to avoid auto-adding optllvm way in
testsuite/config/ghc, but this is still problematic if someone writes
a new LLVM-related test and uses something like when(have_llvm(),
extra_ways(["optllvm"])). So better just enforce have_llvm=False for
these targets here.

- - - - -
ca03226d by Ben Gamari at 2025-08-18T13:43:20+00:00
configure: Allow use of LLVM 20
- - - - -
783cd7d6 by Cheng Shao at 2025-08-18T20:13:14-04:00
compiler: use `UniqMap` instead of `Map` for `BCEnv` in bytecode compiler

The bytecode compiler maintains a `BCEnv` which was previously `Map Id
StackDepth`. Given `Id` is `Uniquable`, we might as well use `UniqMap`
here as a more efficient data structure, hence this patch.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
58e46da9 by fendor at 2025-08-18T20:13:56-04:00
rts: Strip lower three bits when hashing Word instead of lower eight bits

- - - - -
45dbfa23 by Cheng Shao at 2025-08-18T20:14:37-04:00
libffi: update to 3.5.2

Bumps libffi submodule.

- - - - -
54be78ef by Ben Gamari at 2025-08-19T16:28:05-04:00
testsuite: Fix T20006b

This test is supposed to fail for non-threaded ways yet it
was previously marked as only failing in `normal`.
Fix this.
- - - - -
f4bac607 by Simon Peyton Jones at 2025-08-19T16:28:47-04:00
Take yet more care with reporting redundant constraints

This small patch fixes #25992, which relates to reporting redundant
constraints on default-method declarations.

See (TRC5) in Note [Tracking redundant constraints]

- - - - -
ab130fec by fendor at 2025-08-19T16:29:29-04:00
Bump dependencies of hadrian-bootstrap-gen to use GHC 9.6.7

- - - - -
6d02ac6f by fendor at 2025-08-19T16:29:29-04:00
Bump required GHC version for test-bootstrap jobs to 9.10.1

Include test-bootstrap job for GHC 9.12.2.

Update hadrian bootstrap plans use GHC 9.10 and 9.12

Remove older GHC bootstrap configurations.
We require at least GHC 9.10.1 to build GHC.

Adds plans for:

* 9.10.1
* 9.10.2
* 9.12.1
* 9.12.2

- - - - -
9e857171 by Brandon Chinn at 2025-08-20T11:47:46-04:00
Don't warn unused-imports with used generated imports

Fixes #21730

* The old notion of "implicit" import has been renamed to "generated". See Note [Generated imports] in GHC.Hs.ImpExp.

* ImportMap now keeps track of generated and user-written imports separately. This avoids the fake SrcSpan we used to give the implicit Prelude import, and the hack that went with it.

* -ddump-minimal-imports now considers generated imports (but still only
  warns on + prints user-written imports)

* bestImport considers generated imports to take priority over user-written imports.

- - - - -
9fb3bad4 by Ben Gamari at 2025-08-20T11:48:31-04:00
mailmap: Use ben@well-typed.com more liberally

Nearly all of this work was done while working for Well-Typed.

- - - - -
774fec37 by Ben Gamari at 2025-08-20T11:49:15-04:00
Add primop to annotate the call stack with arbitrary data

We introduce a new primop `annotateStack#` which allows us to push
arbitrary data onto the call-stack.
This allows us to extract the data later when decoding the stack, for
example when an exception is thrown, showing more information to the
user without having to annotate the full call-stack with `HasCallStack`
constraints.

A new stack frame value is introduced `AnnFrame`, which consists of
nothing but a generic payload.

The primop has a small wrapper API that allows users to annotate their
call-stack in programs.
There is a pure API and an IO-based one. The former is a little bit
dubious, as it affects the evaluation of a program, so use with care.
The latter is "safe", as it doesn't change the evaluation of the
program.

The stack annotation mechanism is similarly implemented to the
`ExceptionAnnotation` and `Exception`, there is a typeclass to indicate
something can be pushed onto the call-stack and all values are wrapped
in the existential `SomeStackAnnotation`, which recover the type of the
annotation payload.

There is currently no builtin way to show the stack annotations when
`Backtraces` are displayed (i.e., when showing stack traces to the user),
which we will address in a follow-up MR.

-------------------------
Metric Increase:
    ghc_experimental_so
-------------------------

We increase the size of the package, so this is not unreasonable.

Co-Authored-By: fendor &lt;fendor@posteo.de>
Co-Authored-By: Ben Gamari &lt;bgamari.foss@gmail.com>

- - - - -
fdfa3892 by Ben Gamari at 2025-08-20T11:49:57-04:00
testsuite: Add regression test for #24606

- - - - -
39b2e382 by Cheng Shao at 2025-08-20T11:50:40-04:00
compiler: only use `Name` instead of `Id` in `SptEntry`

As a part of #26298, this patch refactors `SptEntry` to only carry a
`Name` instead of `Id`: we do not care about extra information like
caffyness or type at all in any static pointer related codegen logic.
This is necessary to make `SptEntry` serializable, as a part of the
grand plan of serializable bytecode.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
276f8ea8 by Vekhir -- at 2025-08-20T11:51:35-04:00
Bump Cabal dependency
- - - - -
0b9c7437 by Zubin Duggal at 2025-08-20T11:52:18-04:00
ci: Teach ci.sh to fetch FreeBSD artifacts from ghcup unofficial bindists and bootstrap compiler on FreeBSD to 9.10.1

Also refactor fetch_ghc logic in ci.sh, renaming the GHC_VERSION enviorment configuration variable to FETCH_GHC_VERSION,
making it clear that it is intended for use on platforms like Windows and FreeBSD where we don't want to use the GHC
excecutable from the platform environment and instead need to download and install GHC-$FETCH_GHC_VERSION from a release
bindist.

Fixes #26296

- - - - -
b2914797 by Cheng Shao at 2025-08-20T11:53:00-04:00
driver: use UniqSet for hiddenModules in DynFlags/FinderOpts

This patch replaces Set ModuleName with UniqSet ModuleName in
DynFlags.hiddenModules and FinderOpts.finder_hiddenModules for
improved efficiency.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
0335d899 by Cheng Shao at 2025-08-20T11:53:00-04:00
driver: use UniqMap ModuleName in the finder

This patch replaces Map ModuleName with UniqMap ModuleName in the
finder for improved efficiency.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
91f4faaa by Cheng Shao at 2025-08-20T11:53:43-04:00
configure: check python3 version and require minimal 3.7

Since !9515, the testsuite driver requires python3 version to be at
least 3.7, though this has never been checked by configure logic. This
patch implements the version check. Fixes #23234.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
df4ee9b4 by Cheng Shao at 2025-08-20T11:54:25-04:00
compiler: use zero cost coerce in GHC.CmmToAsm.CFG.loopInfo

This patch refactors GHC.CmmToAsm.CFG.loopInfo to use zero cost coerce
and thus addresses the TODO. For coerce to work, constructors of
Label/LabelMap/LabelSet from GHC.Cmm.Dataflow.Label are exposed,
though I believe it's a worthy tradeoff to avoid unnecessary runtime
cost without using unsafeCoerce, since the latter could be a landmine
for future refactoring.

Co-authored-by: Codex &lt;codex@openai.com>

- - - - -
ccda188d by Simon Peyton Jones at 2025-08-20T11:55:07-04:00
Start with empty inerts in shortcut solving

When short-cut solving we were starting with an inert set that had
unsolved Wanteds.  This caused an infinite loop (#26314), because a
typechecker plugin kept being given that unsolved Wanted.

It's better just to start with an empty inert set

- - - - -
c8882ed7 by Ben Gamari at 2025-08-20T11:55:49-04:00
configure: Bump minimal bootstrap GHC version to 9.8
- - - - -
f0a19d74 by fendor at 2025-08-20T19:55:00-04:00
Remove deprecated functions from the ghci package

- - - - -
ebeb991b by fendor at 2025-08-20T19:55:00-04:00
base: Remove unstable heap representation details from GHC.Exts

- - - - -
e368e247 by Rodrigo Mesquita at 2025-08-20T19:55:42-04:00
bytecode: Use 32bits for breakpoint index

Fixes #26325

- - - - -
42724462 by Simon Hengel at 2025-08-21T17:52:11-04:00
Serialize wired-in names as external names when creating HIE files

Note that the domain of de-serialized names stays the same.
Specifically, for known-key names, before `lookupKnownKeyName` was used,
while now this is handled by `lookupOrigNameCache` which captures the
same range provided that the OrigNameCache has been initialized with
`knownKeyNames` (which is the case by default).

(fixes #26238)

- - - - -
6a43f8ec by Cheng Shao at 2025-08-21T17:52:52-04:00
compiler: fix closure C type in SPT init code

This patch fixes the closure C type in SPT init code to StgClosure,
instead of the previously incorrect StgPtr. Having an incorrect C type
makes SPT init code not compatible with other foreign stub generation
logic, which may also emit their own extern declarations for the same
closure symbols and thus will clash with the incorrect prototypes in
SPT init code.

- - - - -
5b5d9d47 by Ben Gamari at 2025-08-25T14:29:35-04:00
Revert "STM: don't create a transaction in the rhs of catchRetry# (#26028)"

This reverts commit 0a5836891ca29836a24c306d2a364c2e4b5377fd
- - - - -
10f06163 by Cheng Shao at 2025-08-25T14:30:16-04:00
wasm: ensure setKeepCAFs() is called in ghci

This patch is a critical bugfix for #26106, see comment and linked
issue for details.

- - - - -
bedc1004 by Cheng Shao at 2025-08-26T09:31:18-04:00
compiler: use zero cost coerce in hoopl setElems/mapToList

This patch is a follow-up of !14680 and changes setElems/mapToList in
GHC/Cmm/Dataflow/Label to use coerce instead of mapping mkHooplLabel
over the keys.

- - - - -
13250d97 by Ryan Scott at 2025-08-26T09:31:59-04:00
Reject infix promoted data constructors without DataKinds

In the rename, make sure to apply the same `DataKinds` checks for both
`HsTyVar` (for prefix promoted data constructors) and `HsOpTy` (for infix
promoted data constructors) alike.

Fixes #26318.

- - - - -
37655c46 by Teo Camarasu at 2025-08-26T15:24:51-04:00
tests: disable T22859 under LLVM

This test was failing under the LLVM backend since the allocations
differ from the NCG.

Resolves #26282

- - - - -
2cbba9d6 by Teo Camarasu at 2025-08-26T15:25:33-04:00
base-exports: update version numbers

As the version of the compiler has been bumped, a lot of the embedded
version numbers will need to be updated if we ever run this test with
`--test-accept` so let's just update them now, and keep future diffs
clean.

- - - - -
f9f2ffcf by Alexandre Esteves at 2025-08-27T07:19:14-04:00
Import new name for 'utimbuf' on windows to fix #26337

Fixes an `-Wincompatible-pointer-types` instance that turns into an error on
recent toolchains and surfaced as such on nixpkgs when doing linux->ucrt cross.

This long-standing warning has been present at least since 9.4:

C:\GitLabRunner\builds\0\1709189\tmp\ghc16652_0\ghc_4.c:26:115: error:
     warning: incompatible pointer types passing 'struct utimbuf *' to parameter of type 'struct _utimbuf *' [-Wincompatible-pointer-types]
   |
26 | HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);}

   |                                                                                                                   ^
HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);}
                                                                                                                  ^~

C:\GitLabRunner\builds\0\1709189\_build\stage0\lib\..\..\mingw\x86_64-w64-mingw32\include\sys\utime.h:109:72: error:
     note: passing argument to parameter '_Utimbuf' here
    |
109 | __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) {
    |                                                                        ^
__CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) {
```

- - - - -
ae89f000 by Hassan Al-Awwadi at 2025-08-27T07:19:56-04:00
Adds the fucnction addDependentDirectory to Q, resolving issue #26148.

This function adds a new directory to the list of things a module depends upon. That means that when the contents of the directory change, the recompilation checker will notice this and the module will be recompiled. Documentation has also been added for addDependentFunction and addDependentDirectory in the user guide.

- - - - -
00478944 by Simon Peyton Jones at 2025-08-27T16:48:30+01:00
Comments only

- - - - -
a7884589 by Simon Peyton Jones at 2025-08-28T11:08:23+01:00
Type-family occurs check in unification

The occurs check in `GHC.Core.Unify.uVarOrFam` was inadequate in dealing
with type families.

Better now.  See Note [The occurs check in the Core unifier].

As I did this I realised that the whole apartness thing is trickier than I
thought: see the new Note [Shortcomings of the apartness test]

- - - - -
8adfc222 by sheaf at 2025-08-28T19:47:17-04:00
Fix orientation in HsWrapper composition (<.>)

This commit fixes the order in which WpCast HsWrappers are composed,
fixing a bug introduced in commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1.

Fixes #26350

- - - - -
eb2ab1e2 by Oleg Grenrus at 2025-08-29T11:00:53-04:00
Generalise thNameToGhcName by adding HasHscEnv

There were multiple single monad-specific `getHscEnv` across codebase.
HasHscEnv is modelled on HasDynFlags.

My first idea was to simply add thNameToGhcNameHsc and
thNameToGhcNameTc, but those would been exactly the same
as thNameToGhcName already.

Also add an usage example to thNameToGhcName and mention that it's
recommended way of looking up names in GHC plugins

- - - - -
2d575a7f by fendor at 2025-08-29T11:01:36-04:00
configure: Bump minimal bootstrap GHC version to 9.10

- - - - -
716274a5 by Simon Peyton Jones at 2025-08-29T17:27:12-04:00
Fix deep subsumption again

This commit fixed #26255:

    commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1
    Author: sheaf <sam.derbyshire@gmail.com>
    Date:   Mon Aug 11 15:50:47 2025 +0200

        Improve deep subsumption

        This commit improves the DeepSubsumption sub-typing implementation
        in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back
        to unification.

But alas it still wasn't quite right for view patterns: #26331

This MR does a generalisation to fix it.  A bit of a sledgehammer to crack
a nut, but nice.

* Add a field `ir_inst :: InferInstFlag` to `InferResult`, where
  ```
  data InferInstFlag = IIF_Sigma | IIF_ShallowRho | IIF_DeepRho
  ```

* The flag says exactly how much `fillInferResult` should instantiate
  before filling the hole.

* We can also use this to replace the previous very ad-hoc `tcInferSigma`
  that was used to implement GHCi's `:type` command.

- - - - -
27206c5e by sheaf at 2025-08-29T17:28:14-04:00
Back-compat for TH SpecialiseP data-con of Pragma

This commit improves the backwards-compatibility story for the
SpecialiseP constructor of the Template Haskell 'Pragma' datatype.

Instead of keeping the constructor but deprecating it, this commit makes
it into a bundled pattern synonym of the Pragma datatype. We no longer
deprecate it; it's useful for handling old-form specialise pragmas.

- - - - -
26dbcf61 by fendor at 2025-08-30T05:10:08-04:00
Move stack decoding logic from ghc-heap to ghc-internal

The stack decoding logic in `ghc-heap` is more sophisticated than the one
currently employed in `CloneStack`. We want to use the stack decoding
implementation from `ghc-heap` in `base`.
We cannot simply depend on `ghc-heap` in `base` due do bootstrapping
issues.
Thus, we move the code that is necessary to implement stack decoding to
`ghc-internal`. This is the right location, as we don't want to add a
new API to `base`.

Moving the stack decoding logic and re-exposing it in ghc-heap is
insufficient, though, as we have a dependency cycle between.

* ghc-heap depends on stage1:ghc-internal
* stage0:ghc depends on stage0:ghc-heap

To fix this, we remove ghc-heap from the set of `stage0` dependencies.

This is not entirely straight-forward, as a couple of boot dependencies,
such as `ghci` depend on `ghc-heap`.
Luckily, the boot compiler of GHC is now >=9.10, so we can migrate `ghci`
to use `ghc-internal` instead of `ghc-heap`, which already exports the
relevant modules.

However, we cannot 100% remove ghc's dependency on `ghc-heap`, since
when we compile `stage0:ghc`, `stage1:ghc-internal` is not yet
available.
Thus, when we compile with the boot-compiler, we still depend on an
older version of `ghc-heap`, and only use the modules from `ghc-internal`,
if the `ghc-internal` version is recent enough.

-------------------------
Metric Increase:
    T24602_perf_size
    T25046_perf_size_gzip
    T25046_perf_size_unicode
    T25046_perf_size_unicode_gzip
    size_hello_artifact
    size_hello_artifact_gzip
    size_hello_unicode
    size_hello_unicode_gzip
-------------------------

These metric increases are unfortunate, they are most likely caused by
the larger (literally in terms of lines of code) stack decoder implementation
that are now linked into hello-word binaries.

On linux, it is almost a 10% increase, which is considerable.

- - - - -
bd80bb70 by fendor at 2025-08-30T05:10:08-04:00
Implement `decode` in terms of `decodeStackWithIpe`

Uses the more efficient stack decoder implementation.

- - - - -
24441165 by fendor at 2025-08-30T05:10:08-04:00
Remove stg_decodeStackzh

- - - - -
fb9cc882 by Simon Peyton Jones at 2025-08-30T05:10:51-04:00
Fix a long standing bug in the coercion optimiser

We were mis-optimising ForAllCo, leading to #26345

Part of the poblem was the tricky tower of abstractions leading to
the dreadful
   GHC.Core.TyCo.Subst.substForAllCoTyVarBndrUsing
This function was serving two masters: regular substitution, but also
coercion optimsation.  So tricky was it that it did so wrong.

In this MR I locate all the fancy footwork for coercion optimisation
in GHC.Core.Coercion.Opt, where it belongs.   That leaves substitution
free to be much simpler.

- - - - -
6c78de2d by Sylvain Henry at 2025-09-01T08:46:19-04:00
Driver: substitute virtual Prim module in --make mode too

When we build ghc-internal with --make (e.g. with cabal-install), we
need to be careful to substitute the virtual interface file for
GHC.Internal.Prim:
- after code generation (we generate code for an empty module, so we get
  an empty interface)
- when we try to reload its .hi file

- - - - -
26e0db16 by fendor at 2025-09-01T08:47:01-04:00
Expose Stack Annotation frames in IPE backtraces by default

When decoding the Haskell-native call stack and displaying the IPE information
for the stack frames, we print the `StackAnnotation` of the `AnnFrame` by default.

This means, when an exception is thrown, any intermediate stack annotations will
be displayed in the `IPE Backtrace`.

Example backtrace:
```
Exception: ghc-internal:GHC.Internal.Exception.ErrorCall:

Oh no!

IPE backtrace:
  annotateCallStackIO, called at app/Main.hs:48:10 in backtrace-0.1.0.0-inplace-server:Main
  annotateCallStackIO, called at app/Main.hs:46:13 in backtrace-0.1.0.0-inplace-server:Main
  Main.handler (app/Main.hs:(46,1)-(49,30))
  Main.liftIO (src/Servant/Server/Internal/Handler.hs:30:36-42)
  Servant.Server.Internal.Delayed.runHandler' (src/Servant/Server/Internal/Handler.hs:27:31-41)
  Control.Monad.Trans.Resource.runResourceT (./Control/Monad/Trans/Resource.hs:(192,14)-(197,18))
  Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:195:20-22)
  Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:(195,5)-(203,31))
  Network.Wai.Handler.Warp.HTTP1.http1server.loop (./Network/Wai/Handler/Warp/HTTP1.hs:(141,9)-(157,42))
HasCallStack backtrace:
  error, called at app/Main.hs:48:32 in backtrace-0.1.0.0-inplace-server:Main
```

The first two entries have been added by `annotateCallStackIO`, defined in `annotateCallStackIO`.

- - - - -
a1567efd by Sylvain Henry at 2025-09-01T23:01:35-04:00
RTS: rely less on Hadrian for flag setting (#25843)

Hadrian used to pass -Dfoo command-line flags directly to build the rts.
We can replace most of these flags with CPP based on cabal flags.
It makes building boot libraries with cabal-install simpler (cf #25843).

- - - - -
ca5b0283 by Sergey Vinokurov at 2025-09-01T23:02:23-04:00
Remove unnecessary irrefutable patterns from Bifunctor instances for tuples

Implementation of https://github.com/haskell/core-libraries-committee/issues/339

Metric Decrease:
    mhu-perf

- - - - -
2da84b7a by sheaf at 2025-09-01T23:03:23-04:00
Only use active rules when simplifying rule RHSs

When we are simplifying the RHS of a rule, we make sure to only apply
rewrites from rules that are active throughout the original rule's
range of active phases.

For example, if a rule is always active, we only fire rules that are
themselves always active when simplifying the RHS. Ditto for inline
activations.

This is achieved by setting the simplifier phase to a range of phases,
using the new SimplPhaseRange constructor. Then:

  1. When simplifying the RHS of a rule, or of a stable unfolding,
     we set the simplifier phase to a range of phases, computed from
     the activation of the RULE/unfolding activation, using the
     function 'phaseFromActivation'.

     The details are explained in Note [What is active in the RHS of a RULE?]
     in GHC.Core.Opt.Simplify.Utils.

  2. The activation check for other rules and inlinings is then:
     does the activation of the other rule/inlining cover the whole
     phase range set in sm_phase? This continues to use the 'isActive'
     function, which now accounts for phase ranges.

On the way, this commit also moves the exact-print SourceText annotation
from the Activation datatype to the ActivationAnn type. This keeps the
main Activation datatype free of any extra cruft.

Fixes #26323

- - - - -
79816cc4 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
cleanup: Move dehydrateCgBreakInfo to Stg2Bc

This no longer has anything to do with Core.

- - - - -
53da94ff by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
rts/Disassembler: Fix spacing of BRK_FUN

- - - - -
08c0cf85 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
debugger: Fix bciPtr in Step-out

We need to use `BCO_NEXT` to move bciPtr to ix=1, because ix=0 points to
the instruction itself!

I do not understand how this didn't crash before.

- - - - -
e7e021fa by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
debugger: Allow BRK_FUNs to head case continuation BCOs

When we start executing a BCO, we may want to yield to the scheduler:
this may be triggered by a heap/stack check, context switch, or a
breakpoint. To yield, we need to put the stack in a state such that
when execution is resumed we are back to where we yielded from.

Previously, a BKR_FUN could only head a function BCO because we only
knew how to construct a valid stack for yielding from one -- simply add
`apply_interp_info` + the BCO to resume executing. This is valid because
the stack at the start of run_BCO is headed by that BCO's arguments.

However, in case continuation BCOs (as per Note [Case continuation BCOs]),
we couldn't easily reconstruct a valid stack that could be resumed
because we dropped too soon the stack frames regarding the value
returned (stg_ret) and received (stg_ctoi) by that continuation.
This is especially tricky because of the variable type and size return
frames (e.g. pointer ret_p/ctoi_R1p vs a tuple ret_t/ctoi_t2).

The trick to being able to yield from a BRK_FUN at the start of a case
cont BCO is to stop removing the ret frame headers eagerly and instead
keep them until the BCO starts executing. The new layout at the start of
a case cont. BCO is described by the new Note [Stack layout when entering run_BCO].

Now, we keep the ret_* and ctoi_* frames when entering run_BCO.
A BRK_FUN is then executed if found, and the stack is yielded as-is with
the preserved ret and ctoi frames.
Then, a case cont BCO's instructions always SLIDE off the headers of the
ret and ctoi frames, in StgToByteCode.doCase, turning a stack like

   |     ....      |
   +---------------+
   |     fv2       |
   +---------------+
   |     fv1       |
   +---------------+
   |     BCO       |
   +---------------+
   | stg_ctoi_ret_ |
   +---------------+
   |    retval     |
   +---------------+
   | stg_ret_..... |
   +---------------+

into

   |     ....      |
   +---------------+
   |     fv2       |
   +---------------+
   |     fv1       |
   +---------------+
   |    retval     |
   +---------------+

for the remainder of the BCO.

Moreover, this more uniform approach of keeping the ret and ctoi frames
means we need less ad-hoc logic concerning the variable size of
ret_tuple vs ret_p/np frames in the code generator and interpreter:
Always keep the return to cont. stack intact at the start of run_BCO,
and the statically generated instructions will take care of adjusting
it.

Unlocks BRK_FUNs at the start of case cont. BCOs which will enable a
better user-facing step-out (#26042) which is free of the bugs the
current BRK_ALTS implementation suffers from (namely, using BRK_FUN
rather than BRK_ALTS in a case cont. means we'll never accidentally end
up in a breakpoint "deeper" than the continuation, because we stop at
the case cont itself rather than on the first breakpoint we evaluate
after it).

- - - - -
ade3c1e6 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
BRK_FUN with InternalBreakLocs for code-generation time breakpoints

At the start of a case continuation BCO, place a BRK_FUN.
This BRK_FUN uses the new "internal breakpoint location" -- allowing us
to come up with a valid source location for this breakpoint that is not associated with a source-level tick.

For case continuation BCOs, we use the last tick seen before it as the
source location. The reasoning is described in Note [Debugger: Stepout internal break locs].

Note how T26042c, which was broken because it displayed the incorrect
behavior of the previous step out when we'd end up at a deeper level
than the one from which we initiated step-out, is now fixed.

As of this commit, BRK_ALTS is now dead code and is thus dropped.

Note [Debugger: Stepout internal break locs]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Step-out tells the interpreter to run until the current function
returns to where it was called from, and stop there.

This is achieved by enabling the BRK_FUN found on the first RET_BCO
frame on the stack (See [Note Debugger: Step-out]).

Case continuation BCOs (which select an alternative branch) must
therefore be headed by a BRK_FUN. An example:

    f x = case g x of <--- end up here
        1 -> ...
        2 -> ...

    g y = ... <--- step out from here

- `g` will return a value to the case continuation BCO in `f`
- The case continuation BCO will receive the value returned from g
- Match on it and push the alternative continuation for that branch
- And then enter that alternative.

If we step-out of `g`, the first RET_BCO on the stack is the case
continuation of `f` -- execution should stop at its start, before
selecting an alternative. (One might ask, "why not enable the breakpoint
in the alternative instead?", because the alternative continuation is
only pushed to the stack *after* it is selected by the case cont. BCO)

However, the case cont. BCO is not associated with any source-level
tick, it is merely the glue code which selects alternatives which do
have source level ticks. Therefore, we have to come up at code
generation time with a breakpoint location ('InternalBreakLoc') to
display to the user when it is stopped there.

Our solution is to use the last tick seen just before reaching the case
continuation. This is robust because a case continuation will thus
always have a relevant breakpoint location:

    - The source location will be the last source-relevant expression
      executed before the continuation is pushed

    - So the source location will point to the thing you've just stepped
      out of

    - Doing :step-local from there will put you on the selected
      alternative (which at the source level may also be the e.g. next
      line in a do-block)

Examples, using angle brackets (<<...>>) to denote the breakpoint span:

    f x = case <<g x>> {- step in here -} of
        1 -> ...
        2 -> ...>

    g y = <<...>> <--- step out from here

    ...

    f x = <<case g x of <--- end up here, whole case highlighted
        1 -> ...
        2 -> ...>>

    doing :step-local ...

    f x = case g x of
        1 -> <<...>> <--- stop in the alternative
        2 -> ...

A second example based on T26042d2, where the source is a do-block IO
action, optimised to a chain of `case expressions`.

    main = do
      putStrLn "hello1"
      <<f>> <--- step-in here
      putStrLn "hello3"
      putStrLn "hello4"

    f = do
      <<putStrLn "hello2.1">> <--- step-out from here
      putStrLn "hello2.2"

    ...

    main = do
      putStrLn "hello1"
      <<f>> <--- end up here again, the previously executed expression
      putStrLn "hello3"
      putStrLn "hello4"

    doing step/step-local ...

    main = do
      putStrLn "hello1"
      f
      <<putStrLn "hello3">> <--- straight to the next line
      putStrLn "hello4"

Finishes #26042

- - - - -
c66910c0 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00
debugger: Re-use the last BreakpointId whole in step-out

Previously, to come up with a location to stop at for `:stepout`, we
would store the location of the last BreakpointId surrounding the
continuation, as described by Note [Debugger: Stepout internal break locs].

However, re-using just the location from the last source breakpoint
isn't sufficient to provide the necessary information in the break
location. Specifically, it wouldn't bind any variables at that location.

Really, there is no reason not to re-use the last breakpoint wholesale,
and re-use all the information we had there. Step-out should behave just
as if we had stopped at the call, but s.t. continuing will not
re-execute the call.

This commit updates the CgBreakInfo to always store a BreakpointId, be
it the original one or the one we're emulating (for step-out).

It makes variable bindings on :stepout work

- - - - -
e4abed7b by sheaf at 2025-09-02T12:20:40-04:00
Revert accidental changes to hie.yaml
- - - - -
003b715b by meooow25 at 2025-09-02T23:48:51+02:00
Adjust the strictness of Data.List.iterate'

* Don't force the next element in advance when generating a (:).
* Force the first element to WHNF like every other element.

Now every element in the output list is forced to WHNF when the (:)
containing it is forced.

CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/335

- - - - -
b2f6aad0 by Simon Hengel at 2025-09-03T04:36:10-04:00
Refactoring: More consistently use logOutput, logInfo, fatalErrorMsg

- - - - -
60a16db7 by Rodrigo Mesquita at 2025-09-03T10:55:50+01:00
bytecode: Don't PUSH_L 0; SLIDE 1 1

While looking through bytecode I noticed a quite common unfortunate
pattern:

...
PUSH_L 0
SLIDE 1 1

We do this often by generically constructing a tail call from a function
atom that may be somewhere arbitrary on the stack.
However, for the special case that the function can be found directly on
top of the stack, as part of the arguments, it's plain redundant to push
then slide it.

In this commit we add a small optimisation to the generation of
tailcalls in bytecode. Simply: lookahead for the function in the stack.
If it is the first thing on the stack and it is part of the arguments
which would be dropped as we entered the tail call, then don't push then
slide it.

In a simple example (T26042b), this already produced a drastic
improvement in generated code (left is old, right is with this patch):

```diff
3c3
< 2025-07-29 10:14:02.081277 UTC
---
...
2025-07-29 10:50:36.560949 UTC
160,161c160
<                                            PUSH_L   0
<                                            SLIDE    1 2

...
SLIDE    1 1
164,165d162
<                                       PUSH_L   0
<                                       SLIDE    1 1
175,176c172
<                             PUSH_L   0
<                             SLIDE    1 2
---
...
SLIDE    1 1
179,180d174
<                        PUSH_L   0
<                        SLIDE    1 1
206,207d199
<                        PUSH_L   0
<                        SLIDE    1 1
210,211d201
<                   PUSH_L   0
<                   SLIDE    1 1
214,215d203
<              PUSH_L   0
<              SLIDE    1 1
218,219d205
<         PUSH_L   0
<         SLIDE    1 1
222,223d207
<    PUSH_L   0
<    SLIDE    1 1
...
600,601c566
<                                                 PUSH_L   0
<                                                 SLIDE    1 2
---
...
SLIDE    1 1
604,605d568
<                                            PUSH_L   0
<                                            SLIDE    1 1
632,633d594
<                                            PUSH_L   0
<                                            SLIDE    1 1
636,637d596
<                                       PUSH_L   0
<                                       SLIDE    1 1
640,641d598
<                                  PUSH_L   0
<                                  SLIDE    1 1
644,645d600
<                             PUSH_L   0
<                             SLIDE    1 1
648,649d602
<                        PUSH_L   0
<                        SLIDE    1 1
652,653d604
<                   PUSH_L   0
<                   SLIDE    1 1
656,657d606
<              PUSH_L   0
<              SLIDE    1 1
660,661d608
<         PUSH_L   0
<         SLIDE    1 1
664,665d610
<    PUSH_L   0
<    SLIDE    1 1
```

I also compiled lib:Cabal to bytecode and counted the number of bytecode
lines with `find dist-newstyle -name "*.dump-BCOs" -exec wc {} +`:

    with unoptimized core:
    1190689 lines (before) - 1172891 lines (now)
    = 17798 less redundant instructions (-1.5% lines)

    with optimized core:
    1924818 lines (before) - 1864836 lines (now)
    = 59982 less redundant instructions (-3.1% lines)

- - - - -
8b2c72c0 by L0neGamer at 2025-09-04T06:32:03-04:00
Add Control.Monad.thenM and Control.Applicative.thenA

- - - - -
39e1b7cb by Teo Camarasu at 2025-09-04T06:32:46-04:00
ghc-internal: invert dependency of GHC.Internal.TH.Syntax on Data.Data

This means that Data.Data no longer blocks building TH.Syntax, which
allows greater parallelism in our builds.

We move the Data.Data.Data instances to Data.Data. Quasi depends on
Data.Data for one of its methods, so,
we split the Quasi/Q, etc definition out of GHC.Internal.TH.Syntax
into its own module. This has the added benefit of splitting up this
quite large module.

Previously TH.Syntax was a bottleneck when compiling ghc-internal. Now
it is less of a bottle-neck and is also slightly quicker to
compile (since it no longer contains these instances) at the cost of
making Data.Data slightly more expensive to compile.
TH.Lift which depends on TH.Syntax can also compile quicker and no
longer blocks ghc-internal finishing to compile.

Resolves #26217

-------------------------
Metric Decrease:
    MultiLayerModulesTH_OneShot
    T13253
    T21839c
    T24471
Metric Increase:
    T12227
-------------------------

- - - - -
bdf82fd2 by Teo Camarasu at 2025-09-04T06:32:46-04:00
compiler: delete unused names in Builtins.Names.TH

returnQ and bindQ are no longer used in the compiler.
There was also a very old comment that referred to them that I have modernized

- - - - -
41a448e5 by Ben Gamari at 2025-09-04T19:21:43-04:00
hadrian: Pass lib & include directories to ghc `Setup configure`

- - - - -
46bb9a79 by Ben Gamari at 2025-09-04T19:21:44-04:00
rts/IPE: Fix compilation when zstd is enabled

This was broken by the refactoring undertaken in
c80dd91c0bf6ac034f0c592f16c548b9408a8481.

Closes #26312.

- - - - -
138a6e34 by sheaf at 2025-09-04T19:22:46-04:00
Make mkCast assertion a bit clearer

This commit changes the assertion message that gets printed when one
calls mkCast with a coercion whose kind does not match the type of the
inner expression. I always found the assertion message a bit confusing,
as it didn't clearly state what exactly was the error.

- - - - -
9d626be1 by sheaf at 2025-09-04T19:22:46-04:00
Simplifier/rules: fix mistakes in Notes & comments

- - - - -
94b62aa7 by Simon Peyton Jones at 2025-09-08T03:37:14-04:00
Refactor ForAllCo

This is a pure refactor, addressing #26389.

It arranges that the kind coercion in a ForAllCo is a MCoercion, rather
than a plain Coercion, thus removing redundancy in the common case.
See (FC8) in Note [ForAllCo]

It's a nice cleanup.

- - - - -
624afa4a by sheaf at 2025-09-08T03:38:05-04:00
Use tcMkScaledFunTys in matchExpectedFunTys

We should use tcMkScaledFunTys rather than mkScaledFunTys in
GHC.Tc.Utils.Unify.matchExpectedFunTys, as the latter crashes
when the kind of the result type is a bare metavariable.
We know the result is always Type-like, so we don't need scaledFunTys
to try to rediscover that from the kind.

Fixes #26277

- - - - -
0975d2b6 by sheaf at 2025-09-08T03:38:54-04:00
Revert "Remove hptAllFamInstances usage during upsweep"

This reverts commit 3bf6720eff5e86e673568e756161e6d6150eb440.

- - - - -
0cf34176 by soulomoon at 2025-09-08T03:38:54-04:00
Family consistency checks: add test for #26154

This commit adds the test T26154, to make sure that GHC doesn't crash
when performing type family consistency checks. This test case
was extracted from Agda.

Fixes #26154

- - - - -
ba210d98 by Simon Peyton Jones at 2025-09-08T16:26:36+01:00
Report solid equality errors before custom errors

This MR fixes #26255 by

* Reporting solid equality errors like
     Int ~ Bool
  before "custom type errors".  See comments in `report1` in
  `reportWanteds`

* Suppressing errors that arise from superclasses of
  Wanteds.  See (SCE1) in Note [Suppressing confusing errors]

More details in #26255.

- - - - -
b6249140 by Simon Peyton Jones at 2025-09-10T10:42:38-04:00
Fix a scoping error in Specialise

This small patch fixes #26329, which triggered a scoping error.

Test is in T21391, with -fpolymorphic-specialisation enabled

- - - - -
45305ab8 by sheaf at 2025-09-10T10:43:29-04:00
Make rationalTo{Float,Double} inline in phase 0

We hold off on inlining these until phase 0 to allow constant-folding
rules to fire. However, once we get to phase 0, we should inline them,
e.g. to expose unboxing opportunities.

See CLC proposal #356.

- - - - -
0959d4bc by Andreas Klebinger at 2025-09-10T10:44:12-04:00
Add regression test for #26056

- - - - -
dc79593d by sheaf at 2025-09-10T10:45:01-04:00
Deep subsumption: unify mults without tcEqMult

As seen in #26332, we may well end up with a non-reflexive multiplicity
coercion when doing deep subsumption. We should do the same thing that
we do without deep subsumption: unify the multiplicities normally,
without requiring that the coercion is reflexive (which is what
'tcEqMult' was doing).

Fixes #26332

- - - - -
4bfe2269 by sheaf at 2025-09-10T10:45:50-04:00
lint-codes: fixup MSYS drive letter on Windows

This change ensures that System.Directory.listDirectory doesn't trip up
on an MSYS-style path like '/c/Foo' when trying to list all testsuite
stdout/stderr files as required for testing coverage of GHC diagnostic
codes in the testsuite.

Fixes #25178

- - - - -
56540775 by Ben Gamari at 2025-09-10T10:46:32-04:00
gitlab-ci: Disable split sections on FreeBSD

Due to #26303.

- - - - -
1537784b by Moritz Angermann at 2025-09-10T10:47:13-04:00
Improve mach-o relocation information

This change adds more information about the symbol and addresses
we try to relocate in the linker.  This significantly helps when
deubbging relocation issues reported by users.

- - - - -
4e67855b by Moritz Angermann at 2025-09-10T10:47:54-04:00
test.mk expect GhcLeadingUnderscore, not LeadingUnderscore (in line with the other Ghc prefixed variables.

- - - - -
c1cdd265 by Moritz Angermann at 2025-09-10T10:48:35-04:00
testsuite: Fix broken exec_signals_child.c

There is no signal 0. The signal mask is 1-32.

- - - - -
99ac335c by Moritz Angermann at 2025-09-10T10:49:15-04:00
testsuite: clarify Windows/Darwin locale rationale for skipping T6037 T2507 T8959a

- - - - -
0e8fa77a by Moritz Angermann at 2025-09-10T10:49:56-04:00
Skip broken tests on macOS (due to leading underscore not handled properly in the expected output.)

- - - - -
28570c59 by Zubin Duggal at 2025-09-10T10:50:37-04:00
docs(sphinx): fix links to reverse flags when using the :ghc-flag:`-fno-<flag>` syntax

This solution is rather hacky and I suspect there is a better way to do this but I don't know
enough about Sphinx to do better.

Fixes #26352

- - - - -
d17257ed by Cheng Shao at 2025-09-10T17:01:27+02:00
rel-eng: update alpine images to 3.22

This patch is a part of #25876 and updates alpine images to 3.22,
while still retaining 3.12 for x86_64 fully_static bindists.

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

- - - - -
db3276bb by Sylvain Henry at 2025-09-11T11:27:28-04:00
T16180: indicate that the stack isn't executable

- - - - -
11eeeba7 by Sylvain Henry at 2025-09-11T11:27:28-04:00
Fix some tests (statically linked GHC vs libc)

When GHC is linked statically, the stdout C global variable that GHC uses
isn't shared with the stdout C global variable used by loaded code.

As a consequence, the latter must be explicitly flushed because GHC
won't flush it before exiting.

- - - - -
80a07571 by Sylvain Henry at 2025-09-11T11:28:18-04:00
Testsuite: fix debug_rts detection

Running the testsuite without Hadrian should set config.debug_rts
correctly too.

- - - - -
62ae97de by Duncan Coutts at 2025-09-12T13:23:33-04:00
Handle heap allocation failure in I/O primops

The current I/O managers do not use allocateMightFail, but future ones
will. To support this properly we need to be able to return to the
primop with a failure. We simply use a bool return value.

Currently however, we will just throw an exception rather than calling
the GC because that's what all the other primops do too.

For the general issue of primops invoking GC and retrying, see
https://gitlab.haskell.org/ghc/ghc/-/issues/24105

- - - - -
cb9093f5 by Duncan Coutts at 2025-09-12T13:23:33-04:00
Move (and rename) scheduleStartSignalHandlers into RtsSignals.h

Previously it was a local helper (static) function in Schedule.c.

Rename it to startPendingSignalHandlers and deifine it as an inline
header function in RtsSignals.h. So it should still be fast.

Each (new style) I/O manager is going to need to do the same, so eliminating
the duplication now makes sense.

- - - - -
9736d44a by Duncan Coutts at 2025-09-12T13:23:33-04:00
Reduce detail in printThreadBlockage I/O blocking cases

The printThreadBlockage is used in debug tracing output.
For the cases BlockedOn{Read,Write,Delay} the output previously included
the fd that was being waited on, and the delay target wake time.

Superficially this sounds useful, but it's clearly not that useful
because it was already wrong for the Win32 non-threaded I/O manager. In
that situation it will print garbage (the async_result pointer, cast to
a fd or a time).

So given that it apparently never mattered that the information was
accurate, then it's hardly a big jump to say it doesn't matter if it is
present at all.

A good reason to remove it is that otherwise we have to make a new
API and a per-I/O manager implementation to fetch the information. And
for some I/O manager implementations, this information is not available.
It is not available in the win32 non-threaded I/O manager. And for some
future Linux ones, there is no need for the fd to be stored, so storing
it would be just extra space used for very little gain.

So the simplest thing is to just remove the detail.

- - - - -
bc0f2d5d by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add TimeoutQueue.{c,h} and corresponding tests

A data structure used to efficiently manage a collection of timeouts.

It is a priority queue based on absolute expiry time. It uses 64bit
high-precision Time for the keys. The values are normal closures which
allows for example using MVars for unblocking.

It is common in many applications for timeouts to be created and then
deleted or altered before they expire. Thus the choice of data structure
for timeouts should support this efficiently. The implementation choice
here is a leftist heap with the extra feature that it supports deleting
arbitrary elements, provided the caller retain a pointer to the element.
While the deleteMin operation takes O(log n) time, as in all heap
structures, the delete operation for arbitrary elements /typically/
takes O(1), and only O(log n) in the worst case. In practice, when
managing thousands of timeouts it can be a factor of 10 faster to delete
a random timeout queue element than to remove the minimum element. This
supports the common use case.

The plan is to use it in some of the RTS-side I/O managers to support
their timer functionality. In this use case the heap value will be an
MVar used for each timeout to unblock waiting threads.

- - - - -
d1679c9d by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add ClosureTable.{c,h} and corresponding tests

A table of pointers to closures on the GC heap with stable indexes.

It provides O(1) alloc, free and lookup. The table can be expanded
using a simple doubling strategy: in which case allocation is typically
O(1) and occasionally O(n) for overall amortised O(1). No shrinking is
used.

The table itself is heap allocated, and points to other heap objects.
As such it's necessary to use markClosureTable to ensure the table is
used as a GC root to keep the table entries alive, and maintain proper
pointers to them as the GC moves heap objects about.

It is designed to be allocated and accesses exclusively from a single
capability, enabling it to work without any locking. It is thus similar
to the StablePtr table, but per-capability which removes the need for
locking. It _should_ also provide lower GC pause times with the
non-moving GC by spending only O(1) time in markClosureTable, vs O(n)
for markStablePtrTable.

The plan is to use it in some of the I/O managers to keep track of
in-flight I/O operations (but not timers). This allows the tracking
info to be kept on the (unpinned) GC heap, and shared with Haskell
code, and by putting a pointer to the tracking information in a table,
the index remains stable and can be passed via foreign code (like the
kernel).

- - - - -
78cb8dd5 by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add the StgAsyncIOOp closure type

This is intended to be used by multiple I/O managers to help with
tracking in-flight I/O operations.

It is called asynchronous because from the point of view of the RTS we
have many such operations in progress at once. From the point of view of
a Haskell thread of course it can look synchronous.

- - - - -
a2839896 by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add StgAsyncIOOp and StgTimeoutQueue to tso->block_info

These will be used by new I/O managers, for threads blocked on I/O or
timeouts.

- - - - -
fdc2451c by Duncan Coutts at 2025-09-12T13:23:33-04:00
Add a new I/O manager based on poll()

This is a proof of concept I/O manager, to show how to add new ones
neatly, using the ClosureTable and TimeoutQueue infrastructure.

It uses the old unix poll() API, so it is of course limited in
performance by that, but it should have the benefit of wide
compatibility. Also we neatly avoid a name clash with the existing
select() I/O manager.

Compared to the select() I/O manager:
1. beause it uses poll() it is not limited to 1024 file descriptors
   (but it's still O(n) so don't expect great performance);
2. it should have much faster threadDelay (when using it in lots of
   threads at once) because it's based on the new TimeoutQueue which is
   O(log n) rather than O(n).

Some of the code related to timers/timouts is put into a shared module
rts/posix/Timeout.{h,c} since it is intended to be shared with other
similar I/O managers.

- - - - -
6c273b76 by Duncan Coutts at 2025-09-12T13:23:34-04:00
Document the I/O managers in the user guide

and note the new poll I/O manager in the release notes.

- - - - -
824fab74 by Duncan Coutts at 2025-09-12T13:23:34-04:00
Use the poll() I/O manager by default

That is, for the non-threaded RTS, prefer the poll I/O manager over the
legacy select() one, if both can be enabled.

This patch is primarily for CI testing, so we should probably remove
this patch before merging. We can change defaults later after wider
testing and feedback.

- - - - -
39392532 by Luite Stegeman at 2025-09-12T13:24:16-04:00
Support larger unboxed sums

Change known constructor encoding for sums in interfaces to use
11 bits for both the arity and the alternative (up from 8 and 6,
respectively)

- - - - -
2af12e21 by Luite Stegeman at 2025-09-12T13:24:16-04:00
Decompose padding smallest-first in Cmm toplevel data constructors

This makes each individual padding value aligned

- - - - -
418fa78f by Luite Stegeman at 2025-09-12T13:24:16-04:00
Use slots smaller than word as tag for smaller unboxed sums

This packs unboxed sums more efficiently by allowing
Word8, Word16 and Word32 for the tag field if the number of
constructors is small enough

- - - - -
8d7e912f by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00
ghc-toolchain: Use ByteOrder rather than new Endianness

Don't introduce a duplicate datatype when the previous one is equivalent
and already used elsewhere. This avoids unnecessary translation between
the two.

- - - - -
7d378476 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00
Read Toolchain.Target files rather than 'settings'

This commit makes GHC read `lib/targets/default.target`, a file with a
serialized value of `ghc-toolchain`'s `GHC.Toolchain.Target`.

Moreover, it removes all the now-redundant entries from `lib/settings`
that are configured as part of a `Target` but were being written into
`settings`.

This makes it easier to support multiple targets from the same compiler
(aka runtime retargetability). `ghc-toolchain` can be re-run many times
standalone to produce a `Target` description for different targets, and,
in the future, GHC will be able to pick at runtime amongst different
`Target` files.

This commit only makes it read the default `Target` configured in-tree
or configured when installing the bindist.

The remaining bits of `settings` need to be moved to `Target` in follow
up commits, but ultimately they all should be moved since they are
per-target relevant.

Fixes #24212

On Windows, the constant overhead of parsing a slightly more complex
data structure causes some small-allocation tests to wiggle around 1 to
2 extra MB (1-2% in these cases).

-------------------------
Metric Increase:
    MultiLayerModulesTH_OneShot
    T10421
    T10547
    T12234
    T12425
    T13035
    T18140
    T18923
    T9198
    TcPlugin_RewritePerf
-------------------------

- - - - -
e0780a16 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00
ghc-toolchain: Move TgtHasLibm to per-Target file

TargetHasLibm is now part of the per-target configuration

Towards #26227

- - - - -
8235dd8c by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00
ghc-toolchain: Move UseLibdw to per-Target file

To support DWARF unwinding, the RTS must be built with the -f+libdw flag
and with the -DUSE_LIBDW macro definition. These flags are passed on
build by Hadrian when --enable-dwarf-unwinding is specified at configure
time.

Whether the RTS was built with support for DWARF is a per-target
property, and as such, it was moved to the per-target
GHC.Toolchain.Target.Target file.

Additionally, we keep in the target file the include and library paths
for finding libdw, since libdw should be checked at configure time (be
it by configure, or ghc-toolchain, that libdw is properly available).

Preserving the user-given include paths for libdw facilitates in the
future building the RTS on demand for a given target (if we didn't keep
that user input, we couldn't)

Towards #26227

- - - - -
d5ecf2e8 by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00
ghc-toolchain: Make "Support SMP" a query on a Toolchain.Target

"Support SMP" is merely a function of target, so we can represent it as
such in `ghc-toolchain`.

Hadrian queries the Target using this predicate to determine how to
build GHC, and GHC queries the Target similarly to report under --info
whether it "Support SMP"

Towards #26227

- - - - -
e07b031a by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00
ghc-toolchain: Make "tgt rts linker only supports shared libs" function on Target

Just like with "Support SMP", "target RTS linker only supports shared
libraries" is a predicate on a `Target` so we can just compute it when
necessary from the given `Target`.

Towards #26227

- - - - -
14123ee6 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00
Solve forall-constraints via an implication, again

In this earlier commit:

  commit 953fd8f1dc080f1c56e3a60b4b7157456949be29
  Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
  Date:   Mon Jul 21 10:06:43 2025 +0100

  Solve forall-constraints immediately, or not at all

I used a all-or-nothing strategy for quantified constraints
(aka forall-constraints).  But alas that fell foul of #26315,
and #26376.

So this MR goes back to solving a quantified constraint by
turning it into an implication; UNLESS we are simplifying
constraints from a SPECIALISE pragma, in which case the
all-or-nothing strategy is great.  See:

   Note [Solving a Wanted forall-constraint]

Other stuff in this MR:

* TcSMode becomes a record of flags, rather than an enumeration
  type; much nicer.

* Some fancy footwork to avoid error messages worsening again
  (The above MR made them better; we want to retain that.)
  See `GHC.Tc.Errors.Ppr.pprQCOriginExtra`.

-------------------------
Metric Decrease:
    T24471
-------------------------

- - - - -
e6c192e2 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00
Add a test case for #26396

...same bug ast #26315

- - - - -
8f3d80ff by Luite Stegeman at 2025-09-13T08:43:09+02:00
Use mkVirtHeapOffsets for reconstructing terms in RTTI

This makes mkVirtHeapOffsets the single source of truth for
finding field offsets in closures.

- - - - -
eb389338 by Luite Stegeman at 2025-09-13T08:43:09+02:00
Sort non-pointer fields by size for more efficient packing

This sorts non-pointer fields in mkVirtHeapOffsets, always
storing the largest field first. The relative order of
equally sized fields remains unchanged.

This reduces wasted padding/alignment space in closures with
differently sized fields.

- - - - -
99b233f4 by Alison at 2025-09-13T16:51:04-04:00
ghc-heap: Fix race condition with profiling builds

Apply the same fix from Closures.hs (64fd0fac83) to Heap.hs by adding
empty imports to make way-dependent dependencies visible to `ghc -M`.

Fixes #15197, #26407

- - - - -
77deaa7a by Cheng Shao at 2025-09-14T21:29:45-04:00
hadrian: build in-tree gmp with -fvisibility=hidden

When hadrian builds in-tree gmp, it should build the shared objects
with -fvisibility=hidden. The gmp symbols are only used by bignum
logic in ghc-internal and shouldn't be exported by the ghc-internal
shared library. We should always strive to keep shared library symbol
table lean, which benefits platforms with slow dynamic linker or even
hard limits about how many symbols can be exported (e.g. macos dyld,
win32 dll and wasm dyld).

- - - - -
42a18960 by Cheng Shao at 2025-09-14T21:30:26-04:00
Revert "wasm: add brotli compression for ghci browser mode"

This reverts commit 731217ce68a1093b5f9e26a07d5bd2cdade2b352.
Benchmarks show non-negligible overhead when browser runs on the same
host, which is the majority of actual use cases.

- - - - -
e6755b9f by Cheng Shao at 2025-09-14T21:30:26-04:00
wasm: remove etag logic in ghci browser mode web server

This commit removes the etag logic in dyld script's ghci browser mode
web server. It was meant to support caching logic of wasm shared
libraries, but even if the port is manually specified to make caching
even relevant, for localhost the extra overhead around etag logic is
simply not worth it according to benchmarks.

- - - - -
ac5859b9 by sheaf at 2025-09-16T14:58:38-04:00
Add 'Outputable Natural' instance

This commit adds an Outputable instance for the Natural natural-number type,
as well as a "natural :: Natural -> SDoc" function that mirrors the existing
"integer" function.

- - - - -
d48ebc23 by Cheng Shao at 2025-09-16T14:59:18-04:00
autoconf: emit warning instead of error for FIND_PYTHON logic

This patch makes FIND_PYTHON logic emit warning instead of error, so
when the user doesn't expect to run the testsuite driver (especially
when installing a bindist), python would not be mandatory. Fixes #26347.

- - - - -
54b5950e by Sylvain Henry at 2025-09-17T04:45:18-04:00
Print fully qualified unit names in name mismatch

It's more user-friendly to directly print the right thing instead of
requiring the user to retry with the additional `-dppr-debug` flag.

- - - - -
403cb665 by Ben Gamari at 2025-09-17T04:46:00-04:00
configure: Fix consistency between distrib and source CC check

Previously distrib/configure.ac did not
include `cc`.

Closes #26394.

- - - - -
2dcd4cb9 by Oleg Grenrus at 2025-09-17T04:46:41-04:00
Use isPrint in showUnique

The comment say

```
-- Avoid emitting non-printable characters in pretty uniques. See #25989.
```

so let the code do exactly that.

There are tags (at least : and 0 .. 9) which weren't in A .. z range.

- - - - -
e5dd754b by Oleg Grenrus at 2025-09-17T04:46:42-04:00
Shorten in-module links in hyperlinked source

Instead of href="This.Module#ident" to just "#ident"

- - - - -
63189b2c by Oleg Grenrus at 2025-09-17T04:46:42-04:00
Use showUnique in internalAnchorIdent

Showing the key of Unique as a number is generally not a great idea.
GHC Unique has a tag in high bits, so the raw number is unnecessarily
big.

So now we have

```html
<a href="#l-rvgK"><span class="hs-identifier hs-var hs-var">bar</span></a>
```

instead of

```html
<a href="#local-6989586621679015689"><span class="hs-identifier hs-var hs-var">bar</span></a>
```

Together with previous changes of shorter intra-module links the effect
on compressed files is not huge, that is expected as we simply remove
repetitive contents which pack well.

```
12_694_206  Agda-2.9.0-docs-orig.tar.gz
12_566_065  Agda-2.9.0-docs.tar.gz
```

However when unpacked, the difference can be significant,
e.g. Agda's largest module source got 5% reduction:

```
14_230_117  Agda.Syntax.Parser.Parser.html
13_422_109  Agda.Syntax.Parser.Parser.html
```

The whole hyperlinked source code directory got similar reduction

```
121M	Agda-2.9.0-docs-orig/src
114M	Agda-2.9.0-docs/src
```

For the reference, sources are about 2/3 of the generated haddocks

```
178M	Agda-2.9.0-docs-old
172M	Agda-2.9.0-docs
```

so we get around 3.5% size reduction overall. Not bad for a small local
changes.

- - - - -
6f63f57b by Stefan Schulze Frielinghaus at 2025-09-17T04:47:22-04:00
rts: Fix alignment for gen_workspace #26334

After a0fa4941903272c48b050d24e93eec819eff51bd bootstrap is broken on
s390x and errors out with

rts/sm/GCThread.h:207:5: error:
     error: alignment of array elements is greater than element size
      207 |     gen_workspace gens[];
          |     ^~~~~~~~~~~~~

The alignment constraint is applied via the attribute to the type
gen_workspace and leaves the underlying type struct gen_workspace_
untouched.  On Aarch64, x86, and s390x the struct has a size of 128
bytes.  On Aarch64 and x86 the alignments of 128 and 64 are divisors of
the size, respectively, which is why the type is a viable member type
for an array.  However, on s390x, the alignment is 256 and therefore is
not a divisor of the size and hence cannot be used for arrays.

Basically I see two fixes here.  Either decrease the alignment
requirement on s390x, or by applying the alignment constraint on the
struct itself.  The former might affect performance as noted in
a0fa4941903272c48b050d24e93eec819eff51bd.  The latter introduces padding
bits whenever necessary in order to ensure that
sizeof(gen_workspace[N])==N*sizeof(gen_workspace) holds which is done by
this patch.

- - - - -
06d25623 by Cheng Shao at 2025-09-17T19:32:27-04:00
ghci: add :shell command

This patch adds a new :shell command to ghci which works similarly to
:!, except it guarantees to run the command via sh -c. On POSIX hosts
the behavior is identical to :!, but on Windows it uses the msys2
shell instead of system cmd.exe shell. This is convenient when writing
simple ghci scripts that run simple POSIX commands, and the behavior
can be expected to be coherent on both Windows and POSIX.

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

- - - - -
186054f7 by Cheng Shao at 2025-09-17T19:32:27-04:00
testsuite: remove legacy :shell trick

This commit makes use of the built-in :shell functionality in ghci in
the test cases, and remove the legacy :shell trick.

- - - - -
0a3a4aa3 by Cheng Shao at 2025-09-17T19:32:27-04:00
docs: document :shell in ghci

This commit documents the :shell command in ghci.

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

- - - - -
a4ff12bb by Cheng Shao at 2025-09-17T19:33:09-04:00
ghc-internal: fix codepages program

codepages was not properly updated during the base -> ghc-internal
migration, this commit fixes it.

- - - - -
7e094def by Cheng Shao at 2025-09-17T19:33:09-04:00
ghc-internal: relax ucd2haskell cabal upper bounds

This commit relaxes ucd2haskell cabal upper bounds to make it runnable
via ghc 9.12/9.14.

- - - - -
7077c9f7 by Cheng Shao at 2025-09-17T19:33:09-04:00
ghc-internal: update to unicode 17.0.0

This commit updates the generated code in ghc-internal to match
unicode 17.0.0.

- - - - -
cef8938f by sheaf at 2025-09-17T19:34:09-04:00
Bad record update msg: allow out-of-scope datacons

This commit ensures that, when we encounter an invalid record update
(because no constructor exists which contains all of the record fields
mentioned in the record update), we graciously handle the situation in
which the constructors themselves are not in scope. In that case,
instead of looking up the constructors in the GlobalRdrEnv, directly
look up their GREInfo using the lookupGREInfo function.

Fixes #26391

- - - - -
a2d9d7c2 by sheaf at 2025-09-17T19:34:09-04:00
Improve Notes about disambiguating record updates

This commit updates the notes [Disambiguating record updates] and
[Type-directed record disambiguation], in particular adding more
information about the deprecation status of type-directed disambiguation
of record updates.

- - - - -
de44e69e by sheaf at 2025-09-19T05:16:51-04:00
Enable TcM plugins in initTc

This commit ensures that we run typechecker plugins and defaulting
plugins whenever we call initTc.

In particular, this ensures that the pattern-match checker, which calls
'initTcDsForSolver' which calls 'initTc', runs with typechecker plugins
enabled. This matters for situations like:

  merge :: Vec n a -> Vec n a -> Vec (2 * n) a
  merge Nil Nil = Nil
  merge (a <: as) (b <: bs) = a :< (b <: merge as bs)

in which we need the typechecker plugin to run in order to tell us that
the Givens would be inconsistent in the additional equation

  merge (_ <: _) Nil

and thus that the equation is not needed.

Fixes #26395

- - - - -
2c378ad2 by Cheng Shao at 2025-09-19T05:17:33-04:00
rel-eng: update fedora image to 42

This patch is a part of #25876 and updates fedora image to 42.

- - - - -
0a9d9ffc by Sylvain Henry at 2025-09-19T13:12:14-04:00
Fix output of T14999 (#23685)

Fix output of T14999 to:
- take into account the +1 offset to DW_AT_low_pc (see Note [Info Offset])
- always use Intel's syntax to force consistency: it was reported that
  sometimes GDB prints `jmpq` instead of `jmp` with the AT&T syntax

- - - - -
1480872a by Vladislav Zavialov at 2025-09-19T13:12:54-04:00
Fix PREP_MAYBE_LIBRARY in prep_target_file.m4

This change fixes a configure error introduced in:

  commit 8235dd8c4945db9cb03e3be3c388d729d576ed1e
  ghc-toolchain: Move UseLibdw to per-Target file

Now the build no longer fails with:

  acghc-toolchain: Failed to read a valid Target value from hadrian/cfg/default.target

- - - - -
d1d9e39e by Ben Gamari at 2025-09-19T18:24:52-04:00
StgToByteCode: Don't assume that data con workers are nullary

Previously StgToByteCode assumed that all data-con workers were of a
nullary representation. This is not a valid assumption, as seen
in #23210, where an unsaturated application of a unary data
constructor's worker resulted in invalid bytecode. Sadly, I have not yet
been able to reduce a minimal testcase for this.

Fixes #23210.

- - - - -
3eeecd50 by Ben Gamari at 2025-09-19T18:24:53-04:00
testsuite: Mark T23146* as unbroken

- - - - -
2e73f342 by sheaf at 2025-09-19T18:24:53-04:00
Add test for #26216

- - - - -
c2efb912 by Sven Tennie at 2025-09-19T18:25:36-04:00
Generate correct test header

This increases convenience when copying & pasting...

- - - - -
d2fb811e by Sven Tennie at 2025-09-19T18:25:36-04:00
foundation test: Fix shift amount (#26248)

Shift primops' results are only defined for shift amounts of 0 to word
size - 1. The approach is similar to testing div-like operations (which
have a constraint regarding zero operands.)

This was partly vibe coded (https://github.com/supersven/ghc/pull/1) but
then heavily refactored.

- - - - -
a62ce115 by Andreas Klebinger at 2025-09-19T18:26:18-04:00
Tweak jspace test

I've given it a longer timeout, and tweaked the test file generation
to speed it up a bit. Hopefully that is enough to make it constentily pass.

Last but not least it now also always uses three threads.

- - - - -
0f034942 by Cheng Shao at 2025-09-19T18:26:59-04:00
rts: remove obsolete CC_SUPPORTS_TLS logic

This patch removes obsolete CC_SUPPORTS_TLS logic throughout the rts,
given __thread is now uniformly supported by C toolchains of all
platforms we currently support.

- - - - -
ef705655 by Cheng Shao at 2025-09-19T18:27:41-04:00
rts: remove obsolete HAS_VISIBILITY_HIDDEN logic

This patch removes obsolete HAS_VISIBILITY_HIDDEN logic throughout the
rts, given __attribute__((visibility("hidden"))) is uniformly
supported by C toolchains of all platforms we currently support.

- - - - -
9fdc1f7d by Cheng Shao at 2025-09-19T18:28:21-04:00
rts: remove -O3 pragma hack in Hash.c

This patch removes an obsolete gcc pragma to specify -O3 in Hash.c.
Hadrian already passes the right flag.

- - - - -
b8cfa8f7 by Cheng Shao at 2025-09-19T18:29:01-04:00
rts: remove obsolete COMPILING_WINDOWS_DLL logic

This patch removes obsolete COMPILING_WINDOWS_DLL logic throughout the
rts. They were once used for compiling to win32 DLLs, but we haven't
been able to compile Haskell units to win32 DLLs for many years now,
due to PE format's restriction of no more than 65536 exported symbols
in a single DLL.

- - - - -
bb760611 by Cheng Shao at 2025-09-19T18:29:42-04:00
wasm: bump browser_wasi_shim to 0.4.2

This patch bumps the browser_wasi_shim dependency of wasm dyld script
to 0.4.2.

- - - - -
8b0940db by Cheng Shao at 2025-09-20T06:48:05-04:00
compiler: move Binary instance of Map to GHC.Utils.Binary

This patch moves `Binary` instance of `Map` from `haddock-api` to
`GHC.Utils.Binary`. This also allows us to remove a redundant instance
defined for `NameEntityInfo`, which is a type synonym for `Map`.

- - - - -
4a8fed75 by Vladislav Zavialov at 2025-09-20T06:48:47-04:00
Fix keyword in ExplicitNamespaces error message (#26418)

Consider this module header and the resulting error:

  {-# LANGUAGE NoExplicitNamespaces #-}
  module T26418 (data HeadC) where

  -- error: [GHC-47007]
  --   Illegal keyword 'type'

Previously, the error message would mention 'type' (as shown above),
even though the user wrote 'data'. This has now been fixed.

The error location has also been corrected: it is now reported at the
keyword position rather than at the position of the associated
import/export item.

- - - - -
867c2675 by Cheng Shao at 2025-09-20T06:49:28-04:00
wasm: fix dyld handling for forward declared GOT.func items

This patch fixes wasm shared linker's handling of forward declared
GOT.func items, see linked issue for details. Also adds T26430 test to
witness the fix. Fixes #26430.

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

- - - - -
e7df6cc0 by Simon Peyton Jones at 2025-09-23T14:34:39-04:00
Improve pretty printer for HsExpr

Given a very deeply-nested application, it just kept printing
deeper and deeper.  This small change makes it cut off.

Test is in #26330, but we also get a dramatic decrease in compile
time for perf/compiler/InstanceMatching:
   InstanceMatching  4,086,884,584  1,181,767,232 -71.1% GOOD
Why? Because before we got a GIGANTIC error message that took
ages to pretty-print; now we get this much more civilised message
(I have removed some whitespace.)

Match.hs:1007:1: error:
    • No instance for ‘Show (F001 a)’ arising from a use of ‘showsPrec’
    • In the second argument of ‘showString’, namely
        ‘(showsPrec
            11 b1
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b2
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b3
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b4
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b5
         (GHC.Internal.Show.showSpace
            (showsPrec
               11 b6
               (GHC.Internal.Show.showSpace (showsPrec ...)))))))))))))’

-----------------------
The main payload is

* At the start of `pprExpr`
* In the defn of `pprApp`

A little bit of refactoring:

* It turned out that we were setting the default cut-off depth to a
  fixed value in two places, so changing one didn't change the other.
  See defaultSDocDepth and defaultSDocCols

* I refactored `pprDeeperList` a bit so I could understand it better.

Because the depth calculation has changed, there are lots of small
error message wibbles.

Metric Decrease:
    InstanceMatching

- - - - -
209f0158 by Simon Peyton Jones at 2025-09-23T14:34:39-04:00
Use Outputable.ellipsis rather than text "..."

- - - - -
64bb0e37 by Sylvain Henry at 2025-09-23T14:35:56-04:00
deriveConstants: automatically pass -fcommon CC flag (#26393)

By mistake we tried to use deriveConstants without passing
`--gcc-flag -fcommon` (which Hadrian does) and it failed.

This patch:
1. adds parsing support for constants stored in the .bss section (i.e.
   when -fcommon isn't passed)
2. enables passing `-fcommon` automatically to the C compiler because
   Windows requires this for subtle reasons
3. Documents the subtle reasons

(1) isn't strictly necessary because we always do (2) but it does no
harm and it is still useful if the CC flags ever contain -fno-common

- - - - -
afcdf92f by Oleg Grenrus at 2025-09-23T14:36:41-04:00
Don't wrap spaces in <span>s

Doing similar comparison as in 63189b2ceca07edf4e179f4180ca60d470c62cb3

With this change the gzipped documentation is now 2% smaller (previously 1%)

12_694_206 Agda-2.9.0-docs-orig.tar.gz
12_436_829 Agda-2.9.0-docs.tar.gz

Unzipped docs are 5% smaller (previously 3%)

178M	Agda-2.9.0-docs-orig
169M	Agda-2.9.0-docs

Individual hyperlinked sources are around 7-10% smaller (previously 5%)
(`Parser` module is generated by happy and has relatively little whitespace)

14_230_117 Agda.Syntax.Parser.Parser.html
13_220_758 Agda.Syntax.Parser.Parser.html

Agda's hyperlinked sources are 9% smaller now:

121M	Agda-2.9.0-docs-orig/src
110M	Agda-2.9.0-docs/src

- - - - -
67de53a6 by Cheng Shao at 2025-09-23T14:37:31-04:00
rts: remove obsolete __GNUC__ related logic

This patch removes obsolete `__GNUC__` related logic, given on any
currently supported platform and toolchain, `__GNUC__ >= 4` is
universally true. Also pulls some other weeds and most notably, use
`__builtin___clear_cache` for clang as well, since clang has supported
this gcc intrinsic since 2014, see
https://github.com/llvm/llvm-project/commit/c491a8d4577052bc6b3b4c72a7db6a7c....

- - - - -
c4d32493 by Sven Tennie at 2025-09-23T20:40:57-04:00
RV64: Fix: Add missing truncation to MO_S_Shr (#26248)

Sub-double word (<W64) registers need to be truncated after the
operation.

- - - - -
41dce477 by Sven Tennie at 2025-09-23T20:40:57-04:00
RV64: Cleanup shift emitting cases/code

Remove overlapping cases to make the shift logic easier to understand.

- - - - -
0a601c30 by Alex Washburn at 2025-09-23T20:41:41-04:00
Correcting LLVM linking of Intel BMI intrinsics pdep{8,16} and pext{8,16}.

This patch fixes #26065.

The LLVM interface does not expose bindings to:

  - llvm.x86.bmi.pdep.8
  - llvm.x86.bmi.pdep.16
  - llvm.x86.bmi.pext.8
  - llvm.x86.bmi.pext.16

So calls are instead made to llvm.x86.bmi.{pdep,pext}.32 in these cases,
with pre/post-operation truncation to constrain the logical value range.

- - - - -
89e8ff3d by Peng Fan at 2025-09-23T20:42:37-04:00
NCG/LA64: Implement MO_BSwap and MO_BRev with bit-manipulation Instructions

- - - - -
50f6be09 by Sylvain Henry at 2025-09-23T20:43:29-04:00
Allow Core plugins to access unoptimized Core (#23337)

Make the first simple optimization pass after desugaring a real CoreToDo
pass. This allows CorePlugins to decide whether they want to be executed
before or after this pass.

- - - - -
30ef0aac by Simon Hengel at 2025-09-23T20:44:12-04:00
docs: Fix typo in scoped_type_variables.rst
- - - - -
f8919262 by Cheng Shao at 2025-09-23T20:44:54-04:00
ghci: fix bootstrapping with 9.12.3-rc1 and above

This patch fixes bootstrapping GHC with 9.12.3-rc1 and above. ghci
defines `Binary` instance for `HalfWord` in `ghc-heap`, which is a
proper `newtype` in 9.14 and starting from 9.12.3. Given we don't
build `ghc-heap` in stage0, we need to fix this predicate so that it
corresponds to the boot ghc versions that contain the right version of
`ghc-heap`.

- - - - -
a7f15858 by sheaf at 2025-09-24T09:49:53-04:00
User's guide: clarify optimisation of INLINABLE unfoldings

This updates the user's guide section on INLINABLE pragmas to explain how
the unfoldings of inlineable functions are optimised. The user's guide incorrectly
stated that the RHS was not optimised at all, but this is not true. Instead, GHC
is careful about phase control to optmise the RHS while retaining the guarantee
that GHC behaves as if the original RHS had been written.
- - - - -
495886d9 by Rodrigo Mesquita at 2025-09-24T09:50:35-04:00
cleanup: Delete historical artifact of COMPILING_WINDOWS_DLL

Namely, drop the obsolete
- DLL_IMPORT_RTS
- DLL_IMPORT_DATA_VAR
- DLL_IMPORT_DATA_VARNAME
- DLL_IMPORT_DATA_REF

These macros were not doing anything and placed inconsistently

Looking at the git logs reveal these macros were used to support
dynamic libraries on Win32, a feature that was dropped
in b8cfa8f741729ef123569fb321c4b2ab4a1a941c

This allows us to get rid of the rts/DLL.h file too.

- - - - -
5ae89054 by Sylvain Henry at 2025-09-24T17:07:00-04:00
Allow disabling builtin rules (#20298)

Add a way to disable built-in rules programmatically and with a debug flag.

I also took the opportunity to add a debug flag to disable bignum rules,
which was only possible programmatically (e.g. in a plugin).

- - - - -
135242ca by Rodrigo Mesquita at 2025-09-24T17:07:44-04:00
Don't use build CFLAGS and friends as target settings

In the GHC in tree configure, `CFLAGS`, `CXXFLAGS`, and similar tool
configuration flags apply to the BUILD phase of the compiler, i.e. to
the tools run to compile GHC itself.

Notably, they should /not/ be carried over to the Target settings, i.e.
these flags should /not/ apply to the tool which GHC invokes at runtime.

Fixes #25637

- - - - -
b418408b by Irene Knapp at 2025-09-25T09:47:54-04:00
Document etymology of "bind" as the name for `>>=`

It took me twenty years of contemplation to realize why it's called that.
I therefore feel that it may not be obvious to beginners.

- - - - -
e9c5e46f by Brandon Chinn at 2025-09-25T09:48:36-04:00
Fix tabs in string gaps (#26415)

Tabs in string gaps were broken in bb030d0d because previously, string gaps were manually parsed, but now it's lexed by the usual Alex grammar and post-processed after successful lexing.

It broke because of a discrepancy between GHC's lexer grammar and the Haskell Report. The Haskell Report includes tabs in whitechar:

whitechar  →  newline | vertab | space | tab | uniWhite

$whitechar used to include tabs until 18 years ago, when it was removed in order to exclude tabs from $white_no_nl in order to warn on tabs: 6e202120. In this MR, I'm adding \t back into $whitechar, and explicitly excluding \t from the $white_no_nl+ rule ignoring all whitespace in source code, which more accurately colocates the "ignore all whitespace except tabs, which is handled in the next line" logic.

As a side effect of this MR, tabs are now allowed in pragmas; currently, a pragma written as {-# \t LANGUAGE ... #-} is interpreted as the tab character being the pragma name, and GHC warns "Unrecognized pragma". With this change, tabs are ignored as whitespace, which more closely matches the Report anyway.

- - - - -
8bf5b309 by Cheng Shao at 2025-09-25T09:49:18-04:00
wasm: remove the --no-turbo-fast-api-calls hack from dynamic linker shebang

This patch removes the `--no-turbo-fast-api-calls` hack from the dyld
script shebang; it was used to workaround v8 fast call coredumps in
nodejs and no longer needed, and comes with a performance penalty,
hence the removal.

- - - - -
c1cab0c3 by Sylvain Henry at 2025-09-26T10:36:30-04:00
Revert "Add necessary flag for js linking"

This reverts commit 84f68e2231b2eddb2e1dc4e90af394ef0f2e803f.

This commit didn't have the expected effect. See discussion in #26290.
Instead we export HEAP8 and HEAPU8 from rts/js/mem.js

- - - - -
0a434a80 by Sylvain Henry at 2025-09-26T10:36:30-04:00
JS: export HEAPU8 (#26290)

This is now required by newer Emscripten versions.

- - - - -
b10296a9 by Andreas Klebinger at 2025-09-26T10:37:11-04:00
sizeExpr: Improve Tick handling.

When determining if we scrutinize a function argument we
now properly look through ticks. Fixes #26444.

- - - - -
d9e2a9a7 by mniip at 2025-09-26T16:00:50-04:00
rts: Refactor parsing of -h flags

We have a nontrivial amount of heap profiling flags available in the
non-profiled runtime, so it makes sense to reuse the parsing code
between the profiled and the non-profiled runtime, only restricting
which flags are allowed.

- - - - -
089e45aa by mniip at 2025-09-26T16:00:50-04:00
rts: Fix parsing of -h options with braces

When the "filter by" -h options were introduced in
bc210f7d267e8351ccb66972f4b3a650eb9338bb, the braces were mandatory.
Then in 3c22fb21fb18e27ce8d941069a6915fce584a526, the braces were made
optional. Then in d1ce35d2271ac8b79cb5e37677b1a989749e611c the brace
syntax stopped working, and no one seems to have noticed.

- - - - -
423f1472 by mniip at 2025-09-26T16:00:50-04:00
rts: add -hT<type> and -hi<table id> heap filtering options (#26361)

They are available in non-profiled builds.

Along the way fixed a bug where combining -he<era> and -hr<retainer>
would ignore whether the retainer matches or not.

- - - - -
4cda4785 by mniip at 2025-09-26T16:00:50-04:00
docs: Document -hT<type> and -hi<addr>

- - - - -
982ad30f by mniip at 2025-09-26T16:00:50-04:00
rts: Refactor dumping the heap census

Always do the printing of the total size right next to where the bucket
label is printed. This prevents accidentally printing a label without
the corresponding amount.

Fixed a bug where exactly this happened for -hi profile and the 0x0
(uncategorized) info table.

There is now also much more symmetry between fprintf(hp_file,...) and
the corresponding traceHeapProfSampleString.

- - - - -
8cbe006a by Cheng Shao at 2025-09-26T16:01:34-04:00
hadrian: fix GHC.Platform.Host generation for cross stage1

This patch fixes incorrectly GHC.Platform.Host generation logic for
cross stage1 in hadrian (#26449). Also adds T26449 test case to
witness the fix.

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

- - - - -
0ddd0fdc by soulomoon at 2025-09-28T19:24:10-04:00
Remove hptAllInstances usage during upsweep

Previously, during the upsweep phase when
checking safe imports, we were loading the module
interface with runTcInteractive, which in turn calls
hptAllInstances. This accesses non-below modules
from the home package table.

Change the implementation of checkSafeImports
to use initTcWithGbl and loadSysInterface to load the
module interface, since we already have TcGblEnv at hand.
This eliminates the unnecessary use of runTcInteractive
and hptAllInstances during the upsweep phase.

- - - - -
e05c496c by Ben Gamari at 2025-09-28T19:24:59-04:00
base: Update changelog to reflect timing of IOPort# removal

This change will make 9.14 afterall.

- - - - -
bdc9d130 by Cheng Shao at 2025-09-28T19:25:45-04:00
rts: fix wasm JSFFI initialization constructor code

This commit fixes wasm JSFFI initialization constructor code so that
the constructor is self-contained and avoids invoking a fake
__main_argc_argv function. The previous approach of reusing
__main_void logic in wasi-libc saves a tiny bit of code, at the
expense of link-time trouble whenever GHC links a wasm module without
-no-hs-main, in which case the driver-generated main function would
clash with the definition here, resulting in a linker error. It's
simply better to avoid messing with the main function, and it would
additionally allow linking wasm32-wasi command modules that does make
use of synchronous JSFFI.

- - - - -
5d59fc8f by Cheng Shao at 2025-09-28T19:26:27-04:00
rts: provide stub implementations of ExecPage functions for wasm

This patch provides stub implementations of ExecPage functions for
wasm. They are never actually invoked at runtime for any non-TNTC
platform, yet they can cause link-time errors of missing symbols when
the GHCi.InfoTable module gets linked into the final wasm module (e.g.
a GHC API program).

- - - - -
a4d664c7 by Cheng Shao at 2025-09-29T17:29:22+02:00
compiler/ghci: replace the LoadDLL message with LoadDLLs

As a part of #25407, this commit changes the LoadDLL message to
LoadDLLs, which takes a list of DLL paths to load and returns the list
of remote pointer handles. The wasm dyld is refactored to take
advantage of LoadDLLs and harvest background parallelism. On other
platforms, LoadDLLs is based on a fallback codepath that does
sequential loading.

The driver is not actually emitting singular LoadDLLs message with
multiple DLLs yet, this is left in subsequent commits.

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

- - - - -
c7fc4bae by Cheng Shao at 2025-09-29T17:29:22+02:00
driver: separate downsweep/upsweep phase in loadPackages'

This commit refactors GHC.Linker.Loader.loadPackages' to be separated
into downsweep/upsweep phases:

- The downsweep phase performs dependency analysis and generates a
  list of topologically sorted packages to load
- The upsweep phase sequentially loads these packages by calling
  loadPackage

This is a necessary refactoring to make it possible to make loading of
DLLs concurrent.

- - - - -
ab180104 by Cheng Shao at 2025-09-29T17:57:19+02:00
driver: emit single LoadDLLs message to load multiple DLLs

This commit refactors the driver so that it emits a single LoadDLLs
message to load multiple DLLs in GHC.Linker.Loader.loadPackages'.
Closes #25407.

-------------------------
Metric Increase:
    MultiLayerModulesTH_OneShot
    TcPlugin_RewritePerf
-------------------------

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

- - - - -
9c304ec0 by Sean D. Gillespie at 2025-09-29T19:57:07-04:00
Fix SIZED_BIN_OP_TY_INT casts in RTS interpreter

Correct `SIZED_BIN_OP_TY_INT` cast to integer. Previously, it cast
its second operand as its parameter `ty`. This does not currently
cause any issues, since we are only using it for bit shifts.

Fixes #26287

- - - - -
a1de535f by Luite Stegeman at 2025-09-30T18:40:28-04:00
rts: Fix lost wakeups in threadPaused for threads blocked on black holes

The lazy blackholing code in threadPaused could overwrite closures
that were already eagerly blackholed, and as such wouldn't have a
marked update frame. If the black hole was overwritten by its
original owner, this would lead to an undetected collision, and
the contents of any existing blocking queue being lost.

This adds a check for eagerly blackholed closures and avoids
overwriting their contents.

Fixes #26324

- - - - -
b7e21e49 by Luite Stegeman at 2025-09-30T18:40:28-04:00
rts: push the correct update frame in stg_AP_STACK

The frame contains an eager black hole (__stg_EAGER_BLACKHOLE_info) so
we should push an stg_bh_upd_frame_info instead of an stg_upd_frame_info.

- - - - -
02a7c18a by Cheng Shao at 2025-09-30T18:41:27-04:00
ghci: fix lookupSymbolInDLL behavior on wasm

This patch fixes lookupSymbolInDLL behavior on wasm to return Nothing
instead of throwing. On wasm, we only have lookupSymbol, and the
driver would attempt to call lookupSymbolInDLL first before falling
back to lookupSymbol, so lookupSymbolInDLL needs to return Nothing
gracefully for the fallback behavior to work.

- - - - -
aa0ca5e3 by Cheng Shao at 2025-09-30T18:41:27-04:00
hadrian/compiler: enable internal-interpreter for ghc library in wasm stage1

This commit enables the internal-interpreter flag for ghc library in
wasm stage1, as well as other minor adjustments to make it actually
possible to launch a ghc api session that makes use of the internal
interpreter. Closes #26431 #25400.

- - - - -
69503668 by Cheng Shao at 2025-09-30T18:41:27-04:00
testsuite: add T26431 test case

This commit adds T26431 to testsuite/tests/ghci-wasm which goes
through the complete bytecode compilation/linking/running pipeline in
wasm, so to witness that the ghc shared library in wasm have full
support for internal-interpreter.

- - - - -
e9445c01 by Matthew Pickering at 2025-09-30T18:42:23-04:00
driver: Load bytecode static pointer entries during linking

Previously the entries were loaded too eagerly, during upsweep, but we
should delay loading them until we know that the relevant bytecode
object is demanded.

Towards #25230

- - - - -
b8307eab by Cheng Shao at 2025-09-30T18:43:14-04:00
autoconf/ghc-toolchain: remove obsolete C99 check

This patch removes obsolete c99 check from autoconf/ghc-toolchain. For
all toolchain & platform combination we support, gnu11 or above is
already supported without any -std flag required, and our RTS already
required C11 quite a few years ago, so the C99 check is completely
pointless.

- - - - -
9c293544 by Simon Peyton Jones at 2025-10-01T09:36:10+01:00
Fix buglet in GHC.Core.Unify.uVarOrFam

We were failing to match two totally-equal types!

This led to #26457.

- - - - -
554487a7 by Rodrigo Mesquita at 2025-10-01T23:04:43-04:00
cleanup: Drop obsolete comment about HsConDetails

HsConDetails used to have an argument representing the type of the
tyargs in a list:

    data HsConDetails tyarg arg rec
      = PrefixCon [tyarg] [arg]

This datatype was shared across 3 synonyms: HsConPatDetails,
HsConDeclH98Details, HsPatSynDetails. In the latter two cases, `tyarg`
was instanced to `Void` meaning the list was always empty for these
cases.

In 7b84c58867edca57a45945a20a9391724db6d9e4, this was refactored such
that HsConDetails no longer needs a type of tyargs by construction. The
first case now represents the type arguments in the args type itself,
with something like:

    ConPat "MkE" [InvisP tp1, InvisP tp2, p1, p2]

So the deleted comment really is just obsolete.

Fixes #26461

- - - - -
6992ac09 by Cheng Shao at 2025-10-02T07:27:55-04:00
testsuite: remove unused expected output files

This patch removes unused expected output files in the testsuites on
platforms that we no longer support.

- - - - -
39eaaaba by Ben Gamari at 2025-10-02T07:28:45-04:00
rts: Dynamically initialize built-in closures

To resolve #26166 we need to eliminate references to undefined symbols
in the runtime system. One such source of these is the runtime's
static references to `I#` and `C#` due the `stg_INTLIKE` and
`stg_CHARLIKE` arrays.

To avoid this we make these dynamic, initializing them during RTS
start-up.

- - - - -
c254c54b by Cheng Shao at 2025-10-02T07:29:33-04:00
compiler: only invoke keepCAFsForGHCi if internal-interpreter is enabled

This patch makes the ghc library only invoke keepCAFsForGHCi if
internal-interpreter is enabled. For cases when it's not (e.g. the
host build of a cross ghc), this avoids unnecessarily retaining all
CAFs in the heap. Also fixes the type signature of c_keepCAFsForGHCi
to match the C ABI.

- - - - -
c9ec4d43 by Simon Hengel at 2025-10-02T18:42:20-04:00
Update copyright in documentation

- - - - -
da9633a9 by Matthew Pickering at 2025-10-02T18:43:04-04:00
loader: Unify loadDecls and loadModuleLinkables functions

These two functions nearly did the same thing. I have refactored them so
that `loadDecls` now calls `loadModuleLinkables`.

Fixes #26459

- - - - -
5db98d80 by Simon Hengel at 2025-10-02T18:43:53-04:00
Fix typo
- - - - -
1275d360 by Matthew Pickering at 2025-10-03T06:05:56-04:00
testsuite: Use ghci_ways to set ways in PackedDataCon/UnboxedTuples/UnliftedDataTypeInterp tests

These tests reimplemented the logic from `valid_way` in order to
determine what ways to run. It's easier to use this combination of
`only_ways` and `extra_ways` to only run in GHCi ways and always run in
GHCi ways.

- - - - -
c06b534b by Matthew Pickering at 2025-10-03T06:06:40-04:00
Rename interpreterBackend to bytecodeBackend

This is preparation for creating bytecode files.

The "interpreter" is one way in which we can run bytecode objects. It is
more accurate to describe that the backend produces bytecode, rather
than the means by which the code will eventually run.

The "interpreterBackend" binding is left as a deprecated alias.

- - - - -
41bdb16f by Andreas Klebinger at 2025-10-06T18:04:34-04:00
Add a perf test for #26425

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

- - - - -
7471eb6a by sheaf at 2025-10-07T21:39:43-04:00
Improve how we detect user type errors in types

This commit cleans up all the code responsible for detecting whether a
type contains "TypeError msg" applications nested inside it. All the
logic is now in 'userTypeError_maybe', which is always deep. Whether
it looks inside type family applications is determined by the passed-in
boolean flag:

  - When deciding whether a constraint is definitely insoluble, don't
    look inside type family applications, as they may still reduce -- in
    which case the TypeError could disappear.
  - When reporting unsolved constraints, look inside type family
    applications: they had the chance to reduce but didn't, and the
    custom type error might contain valuable information.

All the details are explained in Note [Custom type errors in constraints]
in GHC.Tc.Types.Constraint.

Another benefit of this change is that it allows us to get rid of the
deeply dodgy 'getUserTypeErrorMsg' function.

This commit also improves the detection of custom type errors, for
example in equality constraints:

  TypeError blah ~# rhs

It used to be the case that we didn't detect the TypeError on the LHS,
because we never considered that equality constraints could be insoluble
due to the presence of custom type errors. Addressing this oversight
improves detection of redundant pattern match warnings, fixing #26400.

- - - - -
29955267 by Rodrigo Mesquita at 2025-10-07T21:40:25-04:00
cleanup: Drop obsolete settings from config.mk.in

These values used to be spliced into the bindist's `config.mk` s.t. when
`make` was run, the values were read and written into the bindist installation `settings` file.

However, we now carry these values to the bindist directly in the
default.target toolchain file, and `make` writes almost nothing to
`settings` now (see #26227)

The entries deleted in this MR were already unused.

Fixes #26478

- - - - -
f7adfed2 by ARATA Mizuki at 2025-10-08T08:37:24-04:00
T22033 is only relevant if the word size is 64-bit

Fixes #25497

- - - - -
ff1650c9 by Ben Gamari at 2025-10-08T08:38:07-04:00
rts/posix: Enforce iteration limit on heap reservation logic

Previously we could loop indefinitely when attempting to get an address
space reservation for our heap. Limit the logic to 8 iterations to
ensure we instead issue a reasonable error message.

Addresses #26151.

- - - - -
01844557 by Ben Gamari at 2025-10-08T08:38:07-04:00
rts/posix: Hold on to low reservations when reserving heap

Previously when the OS gave us an address space reservation in low
memory we would immediately release it and try again. However, on some
platforms this meant that we would get the same allocation again in the
next iteration (since mmap's `hint` argument is just that, a hint).

Instead we now hold on to low reservations until we have found a
suitable heap reservation.

Fixes #26151.

- - - - -
b2c8d052 by Sven Tennie at 2025-10-08T08:38:47-04:00
Build terminfo only in upper stages in cross-builds (#26288)

Currently, there's no way to provide library paths for [n]curses for
both - build and target - in cross-builds. As stage0 is only used to
build upper stages, it should be fine to build terminfo only for them.

This re-enables building cross-compilers with terminfo.

- - - - -
c58f9a61 by Julian Ospald at 2025-10-08T08:39:36-04:00
ghc-toolchain: Drop `ld.gold` from merge object command

It's deprecated.

Also see #25716

- - - - -
2b8baada by sheaf at 2025-10-08T18:23:37-04:00
Improvements to 'mayLookIdentical'

This commit makes significant improvements to the machinery that decides
when we should pretty-print the "invisible bits" of a type, such as:

  - kind applications, e.g. '@k' in 'Proxy @k ty'
  - RuntimeReps, e.g. 'TYPE r'
  - multiplicities and linear arrows 'a %1 -> b'

To do this, this commit refactors 'mayLookIdentical' to return **which**
of the invisible bits don't match up, e.g. in

  (a %1 -> b) ~ (a %Many -> b)

we find that the invisible bit that doesn't match up is a multiplicity,
so we should set 'sdocLinearTypes = True' when pretty-printing, and with
e.g.

  Proxy @k1 ~ Proxy @k2

we find that the invisible bit that doesn't match up is an invisible
TyCon argument, so we set 'sdocPrintExplicitKinds = True'.

We leverage these changes to remove the ad-hoc treatment of linearity
of data constructors with 'dataConDisplayType' and 'dataConNonLinearType'.
This is now handled by the machinery of 'pprWithInvisibleBits'.

Fixes #26335 #26340

- - - - -
129ce32d by sheaf at 2025-10-08T18:23:37-04:00
Store SDoc context in SourceError

This commits modifies the SourceError datatype which is used for
throwing and then reporting exceptions by storing all the info we need
to be able to print the SDoc, including whether we should print with
explicit kinds, explicit runtime-reps, etc.

This is done using the new datatype:

  data SourceErrorContext
    = SEC
        !DiagOpts
        !(DiagnosticOpts GhcMessage)

Now, when we come to report an error (by handling the exception), we
have access to the full context we need.

Fixes #26387

- - - - -
f9790ca8 by Ben Gamari at 2025-10-08T18:24:19-04:00
gitlab-ci: Make RELEASE_JOB an input

Rather than an undocumented variable.

- - - - -
14281a22 by Ben Gamari at 2025-10-11T14:06:47-04:00
rts/nonmoving: Fix comment spelling

- - - - -
bedd38b0 by Ben Gamari at 2025-10-11T14:06:47-04:00
rts/nonmoving: Use atomic operations to update bd->flags

- - - - -
215d6841 by Ben Gamari at 2025-10-11T14:06:47-04:00
nonmoving: Use get_itbl instead of explicit loads

This is cleaner and also fixes unnecessary (and unsound) use of
`volatile`.

- - - - -
2c94aa3a by Ben Gamari at 2025-10-11T14:06:47-04:00
rts/Scav: Handle WHITEHOLEs in scavenge_one

`scavenge_one`, used to scavenge mutable list entries, may encounter
`WHITEHOLE`s when the non-moving GC is in use via two paths:

  1. when an MVAR is being marked concurrently
  2. when the object belongs to a chain of selectors being short-cutted.

Fixes #26204.

- - - - -
6bd8155c by Matthew Pickering at 2025-10-11T14:07:29-04:00
Add support for generating bytecode objects

This commit adds the `-fwrite-byte-code` option which makes GHC emit a
`.gbc` file which contains a serialised representation of bytecode.

The bytecode can be loaded by the compiler to avoid having to
reinterpret a module when using the bytecode interpreter (for example,
in GHCi).

There are also the new options:

* -gbcdir=<DIR>: Specify the directory to place the gbc files
* -gbcsuf=<suffix>: Specify the suffix for gbc files

The option `-fbyte-code-and-object-code` now implies
`-fwrite-byte-code`.

These performance tests fail due to https://github.com/haskell/directory/issues/204

-------------------------
Metric Increase:
    MultiComponentModules
    MultiLayerModules
    MultiComponentModulesRecomp
    MultiLayerModulesRecomp
    MultiLayerModulesTH_Make
    MultiLayerModulesTH_OneShot
    T13701
-------------------------

The bytecode serialisation part was implemented by Cheng Shao

Co-authored-by: Cheng Shao <terrorjack@type.dance>

- - - - -
dc8f9599 by Matthew Pickering at 2025-10-11T14:07:30-04:00
Revert "Add a perf test for #26425"

This test has a large memory spike currently, which makes the test
sensitive, since if you allocate a little more or less, the precise
location where GC happens shifts and you observe a different part of the
spike.

Andreas told me to revert the patch for now, and he will add it back
when he fixes the memory spike.

This reverts commit 41bdb16fd083110a06507248f648c507a2feb4af.

- - - - -
e10dcd65 by Sven Tennie at 2025-10-12T10:24:56+00:00
T22859: Increase threadDelay for small machines

The previously used thread delay led to failures on my RISC-V test
setups.

- - - - -
d59ef6b6 by Hai / @BestYeen at 2025-10-14T21:51:14-04:00
Change Alex and Happy m4 scripts to display which version was found in the system, adapt small formatting details in Happy script to be more like the Alex script again.
- - - - -
c98abb6a by Hai / @BestYeen at 2025-10-14T21:52:08-04:00
Update occurrences of return to pure and add a sample for redefining :m to mean :main
- - - - -
70ee825a by Cheng Shao at 2025-10-14T21:52:50-04:00
testsuite: fix T3586 for non-SSE3 platforms

`T3586.hs` contains `-fvia-C -optc-msse3` which I think is a
best-effort basis to harvest the C compiler's auto vectorization
optimizations via the C backend back when the test was added. The
`-fvia-C` part is now a deprecated no-op because GHC can't fall back
to the C backend on a non-unregisterised build, and `-optc-msse3`
might actually cause the test to fail on non x86/x64 platforms, e.g.
recent builds of wasi-sdk would report `wasm32-wasi-clang: error:
unsupported option '-msse3' for target 'wasm32-unknown-wasi'`.

So this patch cleans up this historical cruft. `-fvia-C` is removed,
and `-optc-msse3` is only passed when cpuid contains `pni` (which
indicates support of SSE3).

- - - - -
4be32153 by Teo Camarasu at 2025-10-15T08:06:09-04:00
Add submodules for template-haskell-lift and template-haskell-quasiquoter

These two new boot libraries expose stable subsets of the
template-haskell interface.

This is an implemenation of the GHC proposal https://github.com/ghc-proposals/ghc-proposals/pull/696

Work towards #25262

- - - - -
0c00c9c3 by Ben Gamari at 2025-10-15T08:06:51-04:00
rts: Eliminate uses of implicit constant arrays

Folding of `const`-sized variable-length arrays to a constant-length
array is a gnu extension which clang complains about.

Closes #26502.

- - - - -
bf902a1d by Fendor at 2025-10-15T16:00:59-04:00
Refactor distinct constructor tables map construction

Adds `GHC.Types.Unique.FM.alterUFM_L`, `GHC.Types.Unique.DFM.alterUDFM_L`
`GHC.Data.Word64Map.alterLookup` to support fusion of distinct
constructor data insertion and lookup during the construction of the `DataCon`
map in `GHC.Stg.Debug.numberDataCon`.

Co-authored-by: Fendor <fendor@posteo.de>
Co-authored-by: Finley McIlwaine <finleymcilwaine@gmail.com>

- - - - -
b3585ba1 by Fendor at 2025-10-15T16:00:59-04:00
Allow per constructor refinement of distinct-constructor-tables

Introduce `-fno-distinct-constructor-tables`. A distinct constructor table
configuration is built from the combination of flags given, in order. For
example, to only generate distinct constructor tables for a few specific
constructors and no others, just pass
`-fdistinct-constructor-tables-only=C1,...,CN`.
This flag can be supplied multiple times to extend the set of
constructors to generate a distinct info table for.

You can disable generation of distinct constructor tables for all
configurations by passing `-fno-distinct-constructor-tables`.

The various configurations of these flags is included in the `DynFlags`
fingerprints, which should result in the expected recompilation logic.

Adds a test that checks for distinct tables for various given or omitted
constructors.

Updates CountDepsAst and CountDepsParser tests to account for new dependencies.

Fixes #23703

Co-authored-by: Fendor <fendor@posteo.de>
Co-authored-by: Finley McIlwaine <finleymcilwaine@gmail.com>

- - - - -
e17dc695 by fendor at 2025-10-15T16:01:41-04:00
Fix typos in haddock documentation for stack annotation API

- - - - -
f85058d3 by Zubin Duggal at 2025-10-17T13:50:52+05:30
compiler: Attempt to systematize Unique tags by introducing an ADT for each different tag

Fixes #26264

Metric Decrease:
    T9233

- - - - -
c85c845d by sheaf at 2025-10-17T22:35:32-04:00
Don't prematurely final-zonk PatSyn declarations

This commit makes GHC hold off on the final zonk for pattern synonym
declarations, in 'GHC.Tc.TyCl.PatSyn.tc_patsyn_finish'.
This accommodates the fact that pattern synonym declarations without a
type signature can contain unfilled metavariables, e.g. if the RHS of
the pattern synonym involves view-patterns whose type mentions promoted
(level 0) metavariables. Just like we do for ordinary function bindings,
we should allow these metavariables to be settled later, instead of
eagerly performing a final zonk-to-type.

Now, the final zonking-to-type for pattern synonyms is performed in
GHC.Tc.Module.zonkTcGblEnv.

Fixes #26465

- - - - -
ba3e5bdd by Rodrigo Mesquita at 2025-10-18T16:57:18-04:00
Move code-gen aux symbols from ghc-internal to rts

These symbols were all previously defined in ghc-internal and made the
dependency structure awkward, where the rts may refer to some of these
symbols and had to work around that circular dependency the way
described in #26166.

Moreover, the code generator will produce code that uses these symbols!
Therefore, they should be available in the rts:

PRINCIPLE: If the code generator may produce code which uses this
symbol, then it should be defined in the rts rather than, say,
ghc-internal.

That said, the main motivation is towards fixing #26166.

Towards #26166. Pre-requisite of !14892

- - - - -
f31de2a9 by Ben Gamari at 2025-10-18T16:57:18-04:00
rts: Avoid static symbol references to ghc-internal

This resolves #26166, a bug due to new constraints placed by Apple's
linker on undefined references.

One source of such references in the RTS is the many symbols referenced
in ghc-internal. To mitigate #26166, we make these references dynamic,
as described in Note [RTS/ghc-internal interface].

Fixes #26166

Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>
Co-authored-by: Cheng Shao <terrorjack@type.dance>

- - - - -
43fdfddc by Ben Gamari at 2025-10-18T16:57:18-04:00
compiler: Rename isMathFun -> isLibcFun

This set includes more than just math functions.

- - - - -
4ed5138f by Ben Gamari at 2025-10-18T16:57:18-04:00
compiler: Add libc allocator functions to libc_funs

Prototypes for these are now visible from `Prim.h`, resulting in
multiple-declaration warnings in the unregisterised job.

- - - - -
9a0a076b by Ben Gamari at 2025-10-18T16:57:18-04:00
rts: Minimize header dependencies of Prim.h

Otherwise we will end up with redundant and incompatible declarations
resulting in warnings during the unregisterised build.

- - - - -
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

- - - - -
d99f8326 by Cheng Shao at 2025-12-11T19:14:18-05:00
compiler: remove unused CPP code in foreign stub

This patch removes unused CPP code in the generated foreign stub:

- `#define IN_STG_CODE 0` is not needed, since `Rts.h` already
  includes this definition
- The `if defined(__cplusplus)` code paths are not needed in the `.c`
  file, since we don't generate C++ stubs and don't include C++
  headers in our stubs. But it still needs to be present in the `.h`
  header since it might be later included into C++ source files.

- - - - -
46c9746f by Cheng Shao at 2025-12-11T19:14:57-05:00
configure: bump LlvmMaxVersion to 22

This commit bumps LlvmMaxVersion to 22; 21.x releases have been
available since Aug 26th, 2025 and there's no regressions with 21.x so
far. This bump is also required for updating fedora image to 43.

- - - - -
96fce8d0 by Cheng Shao at 2025-12-12T01:17:51+01:00
hadrian: add support for building with UndefinedBehaviorSanitizer

This patch adds a +ubsan flavour transformer to hadrian to build all
stage1+ C/C++ code with UndefinedBehaviorSanitizer. This is
particularly useful to catch potential undefined behavior in the RTS
codebase.

- - - - -
f7a06d8c by Cheng Shao at 2025-12-12T01:17:51+01:00
ci: update alpine/fedora & add ubsan job

This patch updates alpine image to 3.23, fedora image to 43, and adds
a `x86_64-linux-fedora43-validate+debug_info+ubsan` job that's run in
validate/nightly pipelines to catch undefined behavior in the RTS
codebase.

- - - - -
2ccd11ca by Cheng Shao at 2025-12-12T01:17:51+01:00
rts: fix zero-length VLA undefined behavior in interpretBCO

This commit fixes a zero-length VLA undefined behavior in interpretBCO, caught by UBSan:

```
+rts/Interpreter.c:3133:19: runtime variable length array bound evaluates to non-positive value 0
```

- - - - -
4156ed19 by Cheng Shao at 2025-12-12T01:17:51+01:00
rts: fix unaligned ReadSpB in interpretBCO

This commit fixes unaligned ReadSpB in interpretBCO, caught by UBSan:

```
+rts/Interpreter.c:2174:64: runtime load of misaligned address 0x004202059dd1 for type 'StgWord', which requires 8 byte alignment
```

To perform proper unaligned read, we define StgUnalignedWord as a type
alias of StgWord with aligned(1) attribute, and load StgUnalignedWord
instead of StgWord in ReadSpB, so the C compiler is aware that we're
not loading with natural alignment.

- - - - -
fef89fb9 by Cheng Shao at 2025-12-12T01:17:51+01:00
rts: fix signed integer overflow in subword arithmetic in interpretBCO

This commit fixes signed integer overflow in subword arithmetic in
interpretBCO, see added note for detailed explanation.

- - - - -
3c001377 by Cheng Shao at 2025-12-13T05:03:15-05:00
ci: use treeless fetch for perf notes

This patch improves the ci logic for fetching perf notes by using
treeless fetch
(https://github.blog/open-source/git/get-up-to-speed-with-partial-clone-and-s...),
to avoid downloading all blobs of the perf notes repo at once, and
only fetch the actually required blobs on-demand when needed. This
makes the initial `test-metrics.sh pull` operation much faster, and
also more robust, since we are seeing an increasing rate of 504 errors
in CI when fetching all perf notes at once, which is a major source of
CI flakiness at this point.

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

- - - - -
123a8d77 by Peter Trommler at 2025-12-13T05:03:57-05:00
Cmm: remove restriction in MachOp folding

- - - - -
0b54b5fd by Andreas Klebinger at 2025-12-13T05:04:38-05:00
Remove explicit Typeable deriviations.

- - - - -
08b13f7b by Cheng Shao at 2025-12-13T05:05:18-05:00
ci: set gc.auto=0 during setup stage

This patch sets `gc.auto=0` during `setup` stage of CI, see added
comment for detailed explanation.

- - - - -
3b5aecb5 by Ben Gamari at 2025-12-13T23:43:10+01:00
Bump exceptions submodule to 0.10.11

- - - - -
c32de3b0 by Johan Förberg at 2025-12-15T02:36:03-05:00
base: Define Semigroup and Monoid instances for lazy ST

CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/374

Fixes #26581

- - - - -
4f8b660c by mangoiv at 2025-12-15T02:37:05-05:00
ci: do not require nightly cabal-reinstall job to succeed

- - - - -
2c2a3ef3 by Cheng Shao at 2025-12-15T11:51:53-05:00
docs: drop obsolete warning about -fexternal-interpreter on windows

This patch drops an obsolete warning about -fexternal-interpreter not
supported on windows; it is supported since a long time ago, including
the profiled way.

- - - - -
68573aa5 by Marc Scholten at 2025-12-15T11:53:00-05:00
haddock: Drop Haddock.Backends.HaddockDB as it's unused

- - - - -
b230d549 by mangoiv at 2025-12-16T15:17:45-05:00
base: generalize delete{Firsts,}By

When we delete{Firsts,}By we should not require the
lists to be  the same type. This is an especially useful
generalisation in the case of deleteFirstsBy because we
can skip an invocation of the map function.

This change was discussed on the core-libraries-committee's bug
tracker at https://github.com/haskell/core-libraries-committee/issues/372.

- - - - -
6a2b43e3 by Cheng Shao at 2025-12-16T15:18:30-05:00
compiler: clean up redundant LANGUAGE pragmas

This patch bumps `default-language` of `ghc`/`ghc-bin` from `GHC2021`
to `GHC2024` (which is supported in ghc 9.10, current boot ghc lower
version bound), and also cleans up redundant `LANGUAGE` pragmas (as
well as `default-extensions`/`other-extensions`) that are already
implied by `GHC2024`.

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

- - - - -
fca9cd7c by sheaf at 2025-12-18T13:18:18-05:00
X86 CodeGen: fix assign_eax_sse_regs

We must set %al to the number of SSE2 registers that contain arguments
(in case we are dealing with a varargs function). The logic for counting
how many arguments reside in SSE2 registers was incorrect, as it used
'isFloatFormat', which incorrectly ignores vector registers.

We now instead do case analysis on the register class:

  is_sse_reg r =
    case targetClassOfReg platform r of
      RcFloatOrVector -> True
      RcInteger       -> False

This change is necessary to prevent segfaults in T20030_test1j, because
subsequent commits change the format calculations, resulting in vector
formats more often.

- - - - -
53150617 by sheaf at 2025-12-18T13:18:19-05:00
X86 regUsageOfInstr: fix format for IMUL

When used with 8-bit operands, the IMUL instruction returns the result
in the lower 16 bits of %rax (also known as %ax). This is different
than for the other sizes, where an input at 16, 32 or 64 bits will
result in 16, 32 or 64 bits of output in both %rax and %rdx.

This doesn't affect the behaviour of the compiler, because we don't
allow partial writes at sub-word sizes. The rationale is explained
in Wrinkle [Don't allow scalar partial writes] in Note [Register formats in liveness analysis],
in GHC.CmmToAsm.Reg.Liveness.

- - - - -
c7a56dd1 by sheaf at 2025-12-18T13:18:19-05:00
Liveness analysis: consider register formats

This commit updates the register allocator to be a bit more careful in
situations in which a single register is used at multiple different
formats, e.g. when xmm1 is used both to store a Double# and a DoubleX2#.

This is done by introducing the 'Regs' newtype around 'UniqSet RegWithFormat',
for which the combining operations take the larger of the two formats
instead of overriding the format.

Operations on 'Regs' are defined in 'GHC.CmmToAsm.Reg.Regs'. There is
a modest compile-time cost for the additional overhead for tracking
register formats, which causes the metric increases of this commit.

The subtle aspects of the implementation are outlined in
Note [Register formats in liveness analysis] in GHC.CmmToAsm.Reg.Liveness.

Fixes #26411 #26611

-------------------------
Metric Increase:
    T12707
    T26425
    T3294
-------------------------

- - - - -
c2e83339 by sheaf at 2025-12-18T13:18:19-05:00
Register allocator: reload at same format as spill

This commit ensures that if we spill a register onto the stack at a
given format, we then always reload the register at this same format.

This ensures we don't end up in a situation where we spill F64x2 but end
up only reloading the lower F64. This first reload would make us believe
the whole data is in a register, thus silently losing the upper 64 bits
of the spilled register's contents.

Fixes #26526

- - - - -
55ab583b by sheaf at 2025-12-18T13:18:19-05:00
Register allocation: writes redefine format

As explained in Note [Allocated register formats] in GHC.CmmToAsm.Reg.Linear,
we consider all writes to redefine the format of the register.

This ensures that in a situation such as

  movsd .Ln6m(%rip),%v1
  shufpd $0,%v1,%v1

we properly consider the broadcast operation to change the format of %v1
from F64 to F64x2.

This completes the fix to #26411 (test in T26411b).

- - - - -
951402ed by Vladislav Zavialov at 2025-12-18T13:19:05-05:00
Parser: improve mkModuleImpExp, remove checkImportSpec

1. The `mkModuleImpExp` helper now knows whether it is processing an import or
   export list item, and uses this information to produce a more accurate error
   message for `import M (T(..,x))` with PatternSynonyms disabled.
   The old message incorrectly referred to this case as an export form.

2. The `checkImportSpec` helper is removed in favor of more comprehensive error
   checking in `mkModuleImpExp`.

3. Additionaly, the invariants of `ImpExpList` and `ImpExpAllWith` have been
   made more explicit in the comments and assertions (calls to 'panic').

Test case: import-syntax-no-ext

- - - - -
47d83d96 by Vladislav Zavialov at 2025-12-18T13:19:06-05:00
Subordinate namespace-specified wildcards (#25901)

Add support for subordinate namespace-specified wildcards
`X(type ..)` and `X(data ..)` to import and export lists.

Examples:
  import M (Cls(type ..))  -- imports Cls and all its associated types
  import M (Cls(data ..))  -- imports Cls and all its methods
  module M (R(data ..), C(type ..)) where
    -- exports R and all its data constructors and record fields;
    -- exports C and all its associated types, but not its methods

The scope of this change is limited to the case where the wildcard is the only
subordinate import/export item, whereas the more complex forms `X(type .., f)`
or `X(type .., data ..)` are unsupported and raise the newly introduced
PsErrUnsupportedExplicitNamespace error. This restriction may be lifted later.

Summary of the changes:

1. Refactor IEThingAll to store its extension field XIEThingAll as a record
   IEThingAllExt instead of a tuple.

2. Extend the AST by adding a NamespaceSpecifier field to IEThingAllExt,
   representing an optional namespace specifier `type` or `data` in front
   of a subordinate wildcard `X(..)`.

3. Extend the grammar in Parser.y with productions for `type ..` and `data ..`
   in subordinate import/export items.

4. Introduce `filterByNamespaceGREs` to filter [GlobalRdrElt] by a
   NamespaceSpecifier; use it in `filterImports` and `exports_from_avail`
   to account for the namespace specifier in IEThingAll.

5. Improve diagnostics by storing more information in DodgyImportsEmptyParent
   and DodgyExportsEmptyParent.

Test cases:
  T25901_sub_e   T25901_sub_f   T25901_sub_g   T25901_sub_a
  T25901_sub_b   T25901_sub_c   T25901_sub_d   T25901_sub_w
  DodgyImports02 DodgyImports03 DodgyImports04

- - - - -
eac418bb by Recursion Ninja at 2025-12-18T13:19:48-05:00
Removing the 'Data' instance for 'InstEnv'.

The 'Data' instance is blocking work on Trees that Grow, and the
'Data' instance seem to have been added without a clear purpose.

- - - - -
e920e038 by Recursion Ninja at 2025-12-18T13:19:48-05:00
'Decouple Language.Haskell.Syntax.Decls' from 'GHC.Unit.Module.Warnings'

- - - - -
bd38b76c by Cheng Shao at 2025-12-18T13:20:31-05:00
testsuite: improve coverage of foundation test

This patch refactors the `foundation` test a bit to improve coverage:

- Instead of using a hard-coded seed, a random seed is now taken from
  the command line, and printed upon test failure. This improves test
  coverage over many future CI runs, and shall a failure occur, the
  seed is available in the CI log for local reproduction.
- The iterations count is bumped to 1000 instead of 100, similar to
  the bump in `test-primops`. Runtime timeout is bumped 2x just to be
  safe.
- Improve `newLCGGen` by using non-atomic loads/stores on a
  `MutableByteArray#` for storing mutable `Word64`, this test doesn't
  use parallelism in the first place
- Fixed a few compiler warnings and removed redundant pragmas and
  imports

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

- - - - -
3995187c by Sylvain Henry at 2025-12-18T13:21:45-05:00
Doc: document -pgmi "" (#26634)

- - - - -
5729418c by Cheng Shao at 2025-12-18T13:22:29-05:00
rts: use __builtin_mul_overflow for hs_mulIntMayOflo

This patch uses `__builtin_mul_overflow` to implement
`hs_mulIntMayOflo`. This is a GNU C checked arithmetic builtin
function supported by gcc/clang, is type-generic so works for both
32-bit/64-bit, and makes the code both more efficient and easier to
read/maintain than the previous hand rolled logic.

- - - - -
1ca4b49a by Cheng Shao at 2025-12-18T13:23:11-05:00
compiler/rts: fix ABI mismatch in barf() invocations

This patch fixes a long-standing issue of ABI mismatch in `barf()`
invocations, both in compiler-emitted code and in hand written Cmm
code:

- In RTS, we have `barf()` which reports a fatal internal error
  message and exits the program.
- `barf()` is a variadic C function! When used as a callee of a
  foreign call with `ccall` calling convention instead of `capi`,
  there is an ABI mismatch between the caller and the callee!
- Unfortunately, both the compiler and the Cmm sources contain many
  places where we call `barf()` via `ccall` convention!! Like, when
  you write `foreign "C" barf("foo object (%p) entered!", R1)`, it
  totally doesn't do what you think it'll do at all!! The second
  argument `R1` is not properly passed in `va_list`, and the behavior
  is completely undefined!!
- Even more unfortunately, this issue has been sitting around long
  enough because the ABI mismatch is subtle enough on normie platforms
  like x64 and arm64.
- But there are platforms like wasm32 that are stricter about ABI, and
  the broken `barf()` invocations already causes trouble for wasm
  backend: we had to use ugly hacks like `barf(errmsg, NULL)` to make
  `wasm-ld` happy, and even with this band-aid, compiler-generated
  `barf()` invocations are still broken, resulting in regressions in
  certain debug-related functionality, e.g. `-dtag-inference-checks`
  is broken on wasm32 (#22882).

This patch properly fixes the issue:

- We add non-variadic `barf` wrappers in the RTS that can be used as
  `ccall` callees
- Both the compiler `emitBarf` logic and the hand-written Cmm are
  changed to call these wrappers
- `emitBarf` now also properly annotates the foreign call as
  `CmmNeverReturns` to indicate it's a noreturn call to enable more
  efficient code generation

`-dtag-inference-checks` now works on wasm. Closes #22882.

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

- - - - -
b3dd23b9 by Vilim Lendvaj at 2025-12-18T13:23:57-05:00
Remove outdated comment

The Traversable instance for ZipList is no longer in
GHC.Internal.Data.Traversable. In fact, it is right below this very comment.

- - - - -
9a9c2f03 by Cheng Shao at 2025-12-18T13:24:39-05:00
compiler: remove unused OtherSection logic

This patch removes the OtherSection logic in Cmm, given it's never
actually used by any of our backends.

- - - - -
91edd292 by Wolfgang Jeltsch at 2025-12-19T03:18:19-05:00
Remove unused known-key and name variables for generics

This removes the known-key and corresponding name variables for `K1`,
`M1`, `R`, `D`, `C`, `S`, and `URec` from `GHC.Generics`, as they are
apparently nowhere used in GHC’s source code.

- - - - -
73ee7e38 by Wolfgang Jeltsch at 2025-12-19T03:19:02-05:00
Remove unused known keys and names for generics classes

This removes the known-key and corresponding name variables for
`Datatype`, `Constructor`, and `Selector` from `GHC.Generics`, as they
are apparently nowhere used in GHC’s source code.

- - - - -
f69c5f14 by Cheng Shao at 2025-12-19T03:19:45-05:00
wasm: fix handling of ByteArray#/MutableByteArray# arguments in JSFFI imports

This patch fixes the handling of ByteArray#/MutableByteArray#
arguments in JSFFI imports, see the amended note and manual for
explanation. Also adds a test to witness the fix.

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

- - - - -
224446a2 by Cheng Shao at 2025-12-20T07:49:54-05:00
rts: workaround -Werror=maybe-uninitialized false positives

In some cases gcc might report -Werror=maybe-uninitialized that we
know are false positives, but need to workaround it to make validate
builds with -Werror pass.

- - - - -
251ec087 by Cheng Shao at 2025-12-20T07:49:54-05:00
hadrian: use -Og as C/C++ optimization level when debugging

This commit enables -Og as optimization level when compiling the debug
ways of rts. According to gcc documentation
(https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-Og),
-Og is a better choice than -O0 for producing debuggable code. It's
also supported by clang as well, so it makes sense to use it as a
default for debugging. Also add missing -g3 flag to C++ compilation
flags in +debug_info flavour transformer.

- - - - -
fb586c67 by Cheng Shao at 2025-12-20T07:50:36-05:00
compiler: replace DList with OrdList

This patch removes `DList` logic from the compiler and replaces it
with `OrdList` which also supports O(1) concatenation and should be
more memory efficient than the church-encoded `DList`.

- - - - -
8149c987 by Cheng Shao at 2025-12-20T17:06:51-05:00
hadrian: add with_profiled_libs flavour transformer

This patch adds a `with_profiled_libs` flavour transformer to hadrian
which is the exact opposite of `no_profiled_libs`. It adds profiling
ways to stage1+ rts/library ways, and doesn't alter other flavour
settings. It is useful when needing to test profiling logic locally
with a quick flavour.

- - - - -
746b18cd by Cheng Shao at 2025-12-20T17:06:51-05:00
hadrian: fix missing profiled dynamic libraries in profiled_ghc

This commit fixes the profiled_ghc flavour transformer to include
profiled dynamic libraries as well, since they're supported by GHC
since !12595.

- - - - -
4dd7e3b9 by Cheng Shao at 2025-12-20T17:07:33-05:00
ci: set http.postBuffer to mitigate perf notes timeout on some runners

This patch sets http.postBuffer to mitigate the timeout when fetching
perf notes on some runners with slow internet connection. Fixes #26684.

- - - - -
bc36268a by Wolfgang Jeltsch at 2025-12-21T16:23:24-05:00
Remove unused known keys and names for type representations

This removes the known-key and corresponding name variables for
`TrName`, `TrNameD`, `TypeRep`, `KindRepTypeLitD`, `TypeLitSort`, and
`mkTrType`, as they are apparently nowhere used in GHC’s source code.

- - - - -
ff5050e9 by Wolfgang Jeltsch at 2025-12-21T16:24:04-05:00
Remove unused known keys and names for natural operations

This removes the known-key and corresponding name variables for
`naturalAndNot`, `naturalLog2`, `naturalLogBaseWord`, `naturalLogBase`,
`naturalPowMod`, `naturalSizeInBase`, `naturalToFloat`, and
`naturalToDouble`, as they are apparently nowhere used in GHC’s source
code.

- - - - -
424388c2 by Wolfgang Jeltsch at 2025-12-21T16:24:45-05:00
Remove the unused known key and name for `Fingerprint`

This removes the variables for the known key and the name of the
`Fingerprint` data constructor, as they are apparently nowhere used in
GHC’s source code.

- - - - -
a1ed86fe by Wolfgang Jeltsch at 2025-12-21T16:25:26-05:00
Remove the unused known key and name for `failIO`

This removes the variables for the known key and the name of the
`failIO` operation, as they are apparently nowhere used in GHC’s source
code.

- - - - -
b8220daf by Wolfgang Jeltsch at 2025-12-21T16:26:07-05:00
Remove the unused known key and name for `liftM`

This removes the variables for the known key and the name of the `liftM`
operation, as they are apparently nowhere used in GHC’s source code.

- - - - -
eb0628b1 by Wolfgang Jeltsch at 2025-12-21T16:26:47-05:00
Fix the documentation of `hIsClosed`

- - - - -
db1ce858 by sheaf at 2025-12-22T17:11:17-05:00
Do deep subsumption when computing valid hole fits

This commit makes a couple of improvements to the code that
computes "valid hole fits":

  1. It uses deep subsumption for data constructors.
     This matches up the multiplicities, as per
     Note [Typechecking data constructors].
     This fixes #26338 (test: LinearHoleFits).

  2. It now suggests (non-unidirectional) pattern synonyms as valid
     hole fits. This fixes #26339 (test: PatSynHoleFit).

  3. It uses 'stableNameCmp', to make the hole fit output deterministic.

-------------------------
Metric Increase:
    hard_hole_fits
-------------------------

- - - - -
72ee9100 by sheaf at 2025-12-22T17:11:17-05:00
Speed up hole fits with a quick pre-test

This speeds up the machinery for valid hole fits by doing a small
check to rule out obviously wrong hole fits, such as:

  1. A hole fit identifier whose type has a different TyCon at the head,
     after looking through foralls and (=>) arrows, e.g.:
        hole_ty = Int
        cand_ty = Maybe a
     or
        hole_ty = forall a b. a -> b
        cand_ty = forall x y. Either x y
  2. A hole fit identifier that is not polymorphic when the hole type
     is polymorphic, e.g.
       hole_ty = forall a. a -> a
       cand_ty = Int -> Int

-------------------------
Metric Decrease:
    hard_hole_fits
-------------------------

- - - - -
30e513ba by Cheng Shao at 2025-12-22T17:12:00-05:00
configure: remove unused win32-tarballs.md5sum

This patch removes the unused `win32-tarballs.md5sum` file from the
tree. The current mingw tarball download logic in
`mk/get-win32-tarballs.py` fetches and checks against `SHA256SUM` from
the same location where the tarballs are fetched, and this file has
been unused for a few years.

- - - - -
a2d52b3b by Wolfgang Jeltsch at 2025-12-23T04:47:33-05:00
Add an operation `System.IO.hGetNewlineMode`

This commit also contains some small code and documentation changes for
related operations, for the sake of consistency.

- - - - -
b26d134a by Cheng Shao at 2025-12-23T04:48:15-05:00
rts: opportunistically reclaim slop space in shrinkMutableByteArray#

Previously, `shrinkMutableByteArray#` shrinks a `MutableByteArray#`
in-place by assigning the new size to it, and zeroing the extra slop
space. That slop space is not reclaimed and wasted. But it's often the
case that we allocate a `MutableByteArray#` upfront, then shrink it
shortly after, so the `MutableByteArray#` closure sits right at the
end of a nursery block; this patch identifies such chances, and also
shrink `bd->free` if possible, reducing heap space fragmentation.

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

-------------------------
Metric Decrease:
    T10678
-------------------------

- - - - -
c72ddabf by Cheng Shao at 2025-12-23T16:13:23-05:00
hadrian: fix bootstrapping with ghc-9.14

This patch fixes bootstrapping GHC with ghc-9.14, tested locally with
ghc-9.14.1 release as bootstrapping GHC.

- - - - -
0fd6d8e4 by Cheng Shao at 2025-12-23T16:14:05-05:00
hadrian: pass -keep-tmp-files to test ghc when --keep-test-files is enabled

This patch makes hadrian pass `-keep-tmp-files` to test ghc when
`--keep-test-files` is enabled, so you can check the ghc intermediate
files when debugging certain test failures. Closes #26688.

- - - - -
81d10134 by Cheng Shao at 2025-12-24T06:11:52-05:00
configure: remove dead code in configure scripts

This patch removes dead code in our configure scripts, including:

- Variables and auto-detected programs that are not used
- autoconf functions that are not used, or export a variable that's
  not used
- `AC_CHECK_HEADERS` invocations that don't have actual corresponding
  `HAVE_XXX_H` usage
- Other dead code (e.g. stray `AC_DEFUN()`)

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

- - - - -
fb1381c3 by Wolfgang Jeltsch at 2025-12-24T06:12:34-05:00
Remove unused known keys and names for list operations

This removes the known-key and corresponding name variables for
`concat`, `filter`, `zip`, and `(++)`, as they are apparently nowhere
used in GHC’s source code.

- - - - -
7b9c20f4 by Recursion Ninja at 2025-12-24T10:35:36-05:00
Decoupling Language.Haskell.Syntax.Binds from GHC.Types.Basic
by transferring InlinePragma types between the modules.

  * Moved InlinePragma data-types to Language.Haskell.Syntax.Binds.InlinePragma

  * Partitioned of Arity type synonyms to GHC.Types.Arity

  * InlinePragma is now extensible via Trees That Grow

  * Activation is now extensible via Trees That Grow

  * Maybe Arity change to more descriptive InlineSaturation data-type

  * InlineSaturation information removed from InlinePragma during GHS parsing pass

  * Cleaned up the exposed module interfaces of the new modules

- - - - -
a3afae0c by Simon Peyton Jones at 2025-12-25T15:26:36-05:00
Check for rubbish literals in Lint

Addresses #26607.

See new Note [Checking for rubbish literals] in GHC.Core.Lint

- - - - -
8a317b6f by Aaron Allen at 2026-01-01T03:05:15-05:00
[#26183] Associated Type Iface Fix

When determining "extras" for class decl interface entries, axioms for
the associated types need to included so that dependent modules will be
recompiled if those axioms change.

resolves #26183

- - - - -
ae1aeaab by Cheng Shao at 2026-01-01T03:06:32-05:00
testsuite: run numeric tests with optasm when available

This patch adds the `optasm` extra way to nueric tests when NCG is
available. Some numeric bugs only surface with optimization, omitting
this can hide these bugs and even make them slip into release! (e.g. #26711)

- - - - -
6213bb57 by maralorn at 2026-01-02T16:30:32+01:00
GHC.Internal.Exception.Context: Fix comment

on addExceptionAnnotation
- - - - -
b820ff50 by Janis Voigtlaender at 2026-01-05T02:43:18-05:00
GHC.Internal.Control.Monad.replicateM: Fix comment

- - - - -
a8a94aad by Cheng Shao at 2026-01-05T16:24:04-05:00
hadrian: drops unused PE linker script for windows

This patch drops unused PE linker script for windows in the
`MergeObjects` builder of hadrian. The linker script is used for
merging object files into a single `HS*.o` object file and undoing the
effect of split sections, when building the "ghci library" object
file. However, we don't build the ghci library on windows, and this
code path is actually unreachable.

- - - - -
53038ea9 by Cheng Shao at 2026-01-05T16:24:04-05:00
hadrian: drop unused logic for building ghci libraries

This patch drops the unused logic for building ghci libraries in
hadrian:

- The term "ghci library" refers to an optional object file per
  library `HS*.o`, which is merged from multiple object files in that
  library using the `MergeObjects` builder in hadrian.
- The original rationale of having a ghci library object, in addition
  to normal archives, was to speedup ghci loading, since the combined
  object is linked with a linker script to undo the effects of
  `-fsplit-sections` to reduce section count and make it easier for
  the RTS linker to handle.
- However, most GHC builds enable `dynamicGhcPrograms` by default, in
  such cases the ghci library would already not be built.
- `dynamicGhcPrograms` is disabled on Windows, but still we don't
  build the ghci library due to lack of functioning merge objects
  command.
- The only case that we actually build ghci library objects, are
  alpine fully static bindists. However, for other reasons, split
  sections is already disabled for fully static builds anyway!
- There will not be any regression if the ghci library objects are
  absent from a GHC global libdir when `dynamicGhcPrograms` is
  disabled. The RTS linker can already load the archives without any
  issue.

Hence the removal. We now forcibly disable ghci libraries for all
Cabal components, and rip out all logic related to `MergeObjects` and
ghci libraries in hadrian. This also nicely cleans up some old todos
and fixmes that are no longer relevant.

Note that MergeObjects in hadrian is not the same thing as merge
objects in the GHC driver. The latter is not affected by this patch.

-------------------------
Metric Decrease:
    libdir
-------------------------

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

- - - - -
8f209336 by Simon Jakobi at 2026-01-05T16:24:48-05:00
User's guide: Fix link to language extensions

Instead of linking to haddocks, it seemed more useful to link
to the extension overview in the user's guide.

Closes #26614.

- - - - -
0b7df6db by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Improved fundeps for closed type families

The big payload of this commit is to execute the plan suggested
in #23162, by improving the way that we generate functional
dependencies for closed type families.

It is all described in Note [Exploiting closed type families]

Most of the changes are in GHC.Tc.Solver.FunDeps

Other small changes

* GHC.Tc.Solver.bumpReductionDepth.  This function brings together the code that
   * Bumps the depth
   * Checks for overflow
  Previously the two were separated, sometimes quite widely.

* GHC.Core.Unify.niFixSubst: minor improvement, removing an unnecessary
  itraetion in the base case.

* GHC.Core.Unify: no need to pass an InScopeSet to
  tcUnifyTysForInjectivity. It can calculate one for itself; and it is
  never inspected anyway so it's free to do so.

* GHC.Tc.Errors.Ppr: slight impovement to the error message for
  reduction-stack overflow, when a constraint (rather than a type) is
  involved.

* GHC.Tc.Solver.Monad.wrapUnifier: small change to the API

- - - - -
fde8bd88 by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Add missing (KK4) to kick-out criteria

There was a missing case in kick-out that meant we could fail
to solve an eminently-solvable constraint.

See the new notes about (KK4)

- - - - -
00082844 by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Some small refactorings of error reporting in the typechecker

This is just a tidy-up commit.

* Add ei_insoluble to ErrorItem, to cache insolubility.
  Small tidy-up.

* Remove `is_ip` and `mkIPErr` from GHC.Tc.Errors; instead enhance mkDictErr
  to handle implicit parameters.  Small refactor.

- - - - -
fe4cb252 by Simon Peyton Jones at 2026-01-06T09:32:24-05:00
Improve recording of insolubility for fundeps

This commit addresses #22652, by recording when the fundeps for
a constraint are definitely insoluble.  That in turn improves the
perspicacity of the pattern-match overlap checker.

See Note [Insoluble fundeps]

- - - - -
df0ffaa5 by Simon Peyton Jones at 2026-01-06T09:32:24-05:00
Fix a buglet in niFixSubst

The MR of which this is part failed an assertion check extendTvSubst
because we extended the TvSubst with a CoVar.  Boo.

This tiny patch fixes it, and adds the regression test from #13882
that showed it up.

- - - - -
3d6aba77 by konsumlamm at 2026-01-06T09:33:16-05:00
Fix changelog formatting
- - - - -
69e0ab59 by Cheng Shao at 2026-01-06T19:37:56-05:00
compiler: add targetHasRTSWays function

This commit adds a `targetHasRTSWays` util function in
`GHC.Driver.Session` to query if the target RTS has a given Ways (e.g.
WayThreaded).

- - - - -
25a0ab94 by Cheng Shao at 2026-01-06T19:37:56-05:00
compiler: link on-demand external interpreter with threaded RTS

This commit makes the compiler link the on-demand external interpreter
program with threaded RTS if it is available in the target RTS ways.
This is a better default than the previous single-threaded RTS, and it
enables the external interpreter to benefit from parallelism when
deserializing CreateBCOs messages.

- - - - -
92404a2b by Cheng Shao at 2026-01-06T19:37:56-05:00
hadrian: link iserv with threaded RTS

This commit makes hadrian link iserv with threaded RTS if it's
available in the RTS ways. Also cleans up the iserv main C program
which can be replaced by the `-fkeep-cafs` link-time option.

- - - - -
a20542d2 by Cheng Shao at 2026-01-06T19:38:38-05:00
ghc-internal: remove unused GMP macros

This patch removes unused GMP related macros from `ghc-internal`. The
in-tree GMP version was hard coded and outdated, but it was not used
anywhere anyway.

- - - - -
4079dcd6 by Cheng Shao at 2026-01-06T19:38:38-05:00
hadrian: fix in-tree gmp configure error on newer c compilers

Building in-tree gmp on newer c compilers that default to c23 fails at
configure stage, this patch fixes it, see added comment for
explanation.

- - - - -
414d1fe1 by Cheng Shao at 2026-01-06T19:39:20-05:00
compiler: fix LLVM backend pdep/pext handling for i386 target

This patch fixes LLVM backend's pdep/pext handling for i386 target,
and also removes non-existent 128/256/512 bit hs_pdep/hs_pext callees.
See amended note for more explanation. Fixes #26450.

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

- - - - -
c7f6fba3 by Cheng Shao at 2026-01-06T19:39:20-05:00
ci: remove allow_failure flag for i386 alpine job

The LLVM codegen issue for i386 has been fixed, and the i386 alpine
job should pass now. This commit removes the allow_failure flag so
that other i386 regressions in the future are signaled more timely.

- - - - -
52d00c05 by Simon Peyton Jones at 2026-01-07T10:24:21-05:00
Add missing InVar->OutVar lookup in SetLevels

As #26681 showed, the SetLevels pass was failing to map an InVar to
an OutVar.  Very silly!  I'm amazed it hasn't broken before now.

I have improved the type singatures (to mention InVar and OutVar)
so it's more obvious what needs to happen.

- - - - -
ab0a5594 by Cheng Shao at 2026-01-07T10:25:04-05:00
hadrian: drop deprecated pkgHashSplitObjs code path

This patch drops deprecated `pkgHashSplitObjs` code path from hadrian,
since GHC itself has removed split objs support many versions ago and
this code path is unused.

- - - - -
bb3a2ba1 by Cheng Shao at 2026-01-07T10:25:44-05:00
hadrian: remove linting/assertion in quick-validate flavour

The `quick-validate` flavour is meant for testing ghc and passing the
testsuite locally with similar settings to `validate` but faster. This
patch removes the linting/assertion overhead in `quick-validate` to
improve developer experience. I also took the chance to simplify
redundant logic of rts/library way definition in `validate` flavour.

- - - - -
7971f5dd by Cheng Shao at 2026-01-07T10:26:26-05:00
deriveConstants: clean up unused constants

This patch cleans up unused constants from `deriveConstants`, they are
not used by C/Cmm code in the RTS, nor compiler-generated code.

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

- - - - -
4df96993 by Cheng Shao at 2026-01-07T10:27:08-05:00
hadrian: pass -fno-omit-frame-pointer with +debug_info

This patch adds `-fno-omit-frame-pointer` as C/C++ compilation flag
when compiling with `+debug_info` flavour transformer. It's a sane
default when you care about debugging and reliable backtraces, and
makes debugging/profiling with bpf easier.

- - - - -
8a3900a3 by Aaron Allen at 2026-01-07T10:27:57-05:00
[26705] Include TyCl instances in data fam iface entry

Ensures dependent modules are recompiled when the class instances for a
data family instance change.

resolves #26705

- - - - -
a0b980af by Cheng Shao at 2026-01-07T10:28:38-05:00
hadrian: remove unused Hp2Ps/Hpc builders

This patch removes the Hp2Ps/Hpc builders from hadrian, they are
unused in the build system. Note that the hp2ps/hpc programs are still
built and not affected.

- - - - -
50a58757 by Cheng Shao at 2026-01-07T10:29:20-05:00
hadrian: only install js files to libdir for wasm/js targets

There are certain js files required for wasm/js targets to work, and
previously hadrian would install those js files to libdir
unconditionally on other targets as well. This could be a minor
annoyance for packagers especially when the unused js files contain
shebangs that interfere with the packaging process. This patch makes
hadrian only selectively install the right js files for the right
targets.

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

- - - - -
da40e553 by Simon Peyton Jones at 2026-01-07T10:30:00-05:00
Add flavour transformer assertions_stage1

This allows us to enable -DDEBUG assertions in the stage1 compiler

- - - - -
ec3cf767 by Cheng Shao at 2026-01-08T06:24:31-05:00
make: remove unused Makefiles from legacy make build system

This patch removes unused Makefiles from legacy make build system; now
they are never used by hadrian in any way, and they already include
common boilerplate mk files that are long gone in the make build
system removal, hence the housecleaning.

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

- - - - -
04ea3f83 by Cheng Shao at 2026-01-08T06:25:13-05:00
compiler: use -O3 as LLVM optimization level for ghc -O2

The GHC driver clamps LLVM optimization level to `-O2` due to LLVM
crashes, but those were historical issues many years ago that are no
longer relevant for LLVM versions we support today. This patch changes
the driver to use `-O3` as LLVM optimization level when compiling with
`-O2`, which is a better default when we're willing to trade
compilation time for faster generated code.

- - - - -
472df471 by Peter Trommler at 2026-01-08T13:28:54-05:00
Use half-word literals in info tables

With this commit info tables are mapped to the same assembler code
on big-endian and little-endian platforms.

Fixes #26579.

- - - - -
393f9c51 by Simon Peyton Jones at 2026-01-08T13:29:35-05:00
Refactor srutOkForBinderSwap

This MR does a small refactor:

* Moves `scrutOkForBinderSwap` and `BinderSwapDecision`
  to GHC.Core.Utils

* Inverts the sense of the coercion it returns, which makes
  more sense

No effect on behaviour

- - - - -
ad76fb0f by Simon Peyton Jones at 2026-01-08T13:29:36-05:00
Improve case merging

This small MR makes case merging happen a bit more often than
it otherwise could, by getting join points out of the way.

See #26709 and GHC.Core.Utils
  Note [Floating join points out of DEFAULT alternatives]

- - - - -
4c9395f5 by Cheng Shao at 2026-01-08T13:30:16-05:00
hadrian: remove broken hsc2hs flag when cross compiling to windows

This patch removes the `--via-asm` hsc2hs flag when cross compiling to
windows. With recent llvm-mingw toolchain, it would fail with:

```
x86_64-w64-mingw32-hsc2hs: Cannot combine instructions: [Quad 8,Long 4,Long 241,Ref ".Ltmp1-.Ltmp0"]
```

The hsc2hs default `--cross-compile` logic is slower but works.

- - - - -
71fdef55 by Simon Peyton Jones at 2026-01-08T13:30:57-05:00
Try harder to keep the substitution empty

Avoid unnecessary cloning of variables in the Simplifier.

Addresses #26724,

See Note [Keeping the substitution empty]

We get some big wins in compile time

Metrics: compile_time/bytes allocated
-------------------------------------
                                         Baseline
                    Test    Metric          value      New value Change
----------------------------------------------------------------------------
CoOpt_Singletons(normal) ghc/alloc    721,544,088    692,174,216  -4.1% GOOD
     LargeRecord(normal) ghc/alloc  1,268,031,157  1,265,168,448  -0.2%
          T14766(normal) ghc/alloc    918,218,533    688,432,296 -25.0% GOOD
          T15703(normal) ghc/alloc    318,103,629    306,638,016  -3.6% GOOD
          T17836(normal) ghc/alloc    419,174,584    418,400,824  -0.2%
          T18478(normal) ghc/alloc    471,042,976    470,261,376  -0.2%
          T20261(normal) ghc/alloc    573,387,162    563,663,336  -1.7%
          T24984(normal) ghc/alloc     87,832,666     87,636,168  -0.2%
          T25196(optasm) ghc/alloc  1,103,284,040  1,101,376,992  -0.2%
  hard_hole_fits(normal) ghc/alloc    224,981,413    224,608,208  -0.2%

               geo. mean                                          -0.3%
               minimum                                           -25.0%
               maximum                                            +0.1%

Metric Decrease:
    CoOpt_Singletons
    T14766
    T15703

- - - - -
30341168 by Simon Peyton Jones at 2026-01-08T13:31:38-05:00
Add regression test for #24867

- - - - -
1ac1a541 by Julian Ospald at 2026-01-09T02:48:53-05:00
Support statically linking executables properly

Fixes #26434

In detail, this does a number of things:
* Makes GHC aware of 'extra-libraries-static' (this changes the package
  database format).
* Adds a switch '-static-external' that will honour 'extra-libraries-static'
  to link external system dependencies statically.
* Adds a new field to settings/targets: "ld supports verbatim namespace".
  This field is used by '-static-external' to conditionally use '-l:foo.a'
  syntax during linking, which is more robust than trying to find the
  absolute path to an archive on our own.
* Adds a switch '-fully-static' that is meant as a high-level interface
  for e.g. cabal. This also honours 'extra-libraries-static'.

This also attempts to clean up the confusion around library search directories.
At the moment, we have 3 types of directories in the package database
format:
* library-dirs
* library-dirs-static
* dynamic-library-dirs

However, we only have two types of linking: dynamic or static. Given the
existing logic in 'mungeDynLibFields', this patch assumes that
'library-dirs' is really just nothing but a fallback and always
prefers the more specific variants if they exist and are non-empty.

Conceptually, we should be ok with even just one search dirs variant.
Haskell libraries are named differently depending on whether they're
static or dynamic, so GHC can conveniently pick the right one depending
on the linking needs. That means we don't really need to play tricks
with search paths to convince the compiler to do linking as we want it.
For system C libraries, the convention has been anyway to place static and
dynamic libs next to each other, so we need to deal with that issue
anyway and it is outside of our control. But this is out of the scope
of this patch.

This patch is backwards compatible with cabal. Cabal should however
be patched to use the new '-fully-static' switch.

- - - - -
ad3c808d by Julian Ospald at 2026-01-09T02:48:53-05:00
Warn when "-dynamic" is mixed with "-staticlib"

- - - - -
322dd672 by Matthew Pickering at 2026-01-09T02:49:35-05:00
rts: Use INFO_TABLE_CONSTR for stg_dummy_ret_closure

Since the closure type is CONSTR_NOCAF, we need to use INFO_TABLE_CONSTR
to populate the constructor description field (this crashes ghc-debug
when decoding AP_STACK frames sometimes)

Fixes #26745

- - - - -
039bac4c by Ben Gamari at 2026-01-09T20:22:16-05:00
ghc-internal: Move STM utilities out of GHC.Internal.Conc.Sync

This is necessary to avoid an import cycle on Windows when importing
`GHC.Internal.Exception.Context` in `GHC.Internal.Conc.Sync`.

On the road to address #25365.

- - - - -
8c389e8c by Ben Gamari at 2026-01-09T20:22:16-05:00
base: Capture backtrace from throwSTM

Implements core-libraries-committee#297.

Fixes #25365.

- - - - -
e1ce1fc3 by Ben Gamari at 2026-01-09T20:22:16-05:00
base: Annotate rethrown exceptions in catchSTM with WhileHandling

Implements core-libraries-committee#298

- - - - -
c4ebdbdf by Cheng Shao at 2026-01-09T20:23:06-05:00
compiler: make getPrim eagerly evaluate its result

This commit makes `GHC.Utils.Binary.getPrim` eagerly evaluate its
result, to avoid accidental laziness when future patches build other
binary parsers using `getPrim`.

- - - - -
66a0c4f7 by Cheng Shao at 2026-01-09T20:23:06-05:00
compiler: implement fast get/put for Word16/Word32/Word64

Previously, `GHC.Utils.Binary` contains `get`/`put` functions for
`Word16`/`Word32`/`Word64` which always loads and stores them as
big-endian words at a potentially unaligned address. The previous
implementation is based on loads/stores of individual bytes and
concatenating bytes with bitwise operations, which currently cannot be
fused to a single load/store operation by GHC.

This patch implements fast `get`/`put` functions for
`Word16`/`Word32`/`Word64` based on a single memory load/store, with
an additional `byteSwap` operation on little-endian hosts. It is based
on unaligned load/store primops added since GHC 9.10, and we already
require booting with at least 9.10, so it's about time to switch to
this faster path.

- - - - -
641ec3f0 by Simon Peyton Jones at 2026-01-09T20:23:55-05:00
Fix scoping errors in specialisation

Using -fspecialise-aggressively in #26682 showed up a couple of
subtle errors in the type-class specialiser.

* dumpBindUDs failed to call `deleteCallsMentioning`, resulting in a
  call that mentioned a dictionary that was not in scope.  This call
  has been missing since 2009!
    commit c43c981705ec33da92a9ce91eb90f2ecf00be9fe
    Author: Simon Peyton Jones <simonpj@microsoft.com>
    Date:   Fri Oct 23 16:15:51 2009 +0000

  Fixed by re-combining `dumpBindUDs` and `dumpUDs`.

* I think there was another bug involving the quantified type
  variables in polymorphic specialisation. In any case I refactored
  `specHeader` and `spec_call` so that the former looks for the
  extra quantified type variables rather than the latter.  This
  is quite a worthwhile simplification: less code, easier to grok.

Test case in simplCore/should_compile/T26682,
brilliantly minimised by @sheaf.

- - - - -
2433e91d by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: change sectionProtection to take SectionType argument

This commit changes `sectionProtection` to only take `SectionType`
argument instead of whole `Section`, since it doesn't need the Cmm
section content anyway, and it can then be called in parts of NCG
where we only have a `SectionType` in scope.

- - - - -
e5926fbe by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: change isInitOrFiniSection to take SectionType argument

This commit changes `isInitOrFiniSection` to only take `SectionType`
argument instead of whole `Section`, since it doesn't need the Cmm
section content anyway, and it can then be called in parts of NCG
where we only have a `SectionType` in scope. Also marks it as
exported.

- - - - -
244d57d7 by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: fix split sections on windows

This patch fixes split sections on windows by emitting the right
COMDAT section header in NCG, see added comment for more explanation.
Fix #26696 #26494.

-------------------------
Metric Decrease:
    LargeRecord
    T9675
    size_hello_artifact
    size_hello_artifact_gzip
    size_hello_unicode
    size_hello_unicode_gzip
Metric Increase:
    T13035
-------------------------

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

- - - - -
182f3d0f by Cheng Shao at 2026-01-09T20:25:28-05:00
iserv: add comment about -fkeep-cafs

- - - - -
49675b69 by Matthew Craven at 2026-01-09T20:26:14-05:00
Account for "stupid theta" in demand sig for DataCon wrappers

Fixes #26748.

- - - - -
f3c18890 by Samuel Thibault at 2026-01-10T15:48:22+01:00
hurd: Fix getExecutablePath build

3939a8bf93e27 ("GNU/Hurd: Add getExecutablePath support") added using
/proc/self/exe for GNU/Hurd but missed adding the required imports for
the corresponding code.

- - - - -
7f15bd15 by Samuel Thibault at 2026-01-12T07:16:25-05:00
Fix the OS string encoding for GNU/Hurd

Following https://github.com/haskell/cabal/pull/9434/files , and as seen
in the various gnu_HOST_OS usages in the source code, it is expected that
GNU/Hurd is advertised as "gnu", like the autotools do.

- - - - -
1db2f240 by Andrew Lelechenko at 2026-01-12T07:17:06-05:00
Add since annotation for Data.Bifoldable1

Fixes #26432

- - - - -
e038a383 by Sven Tennie at 2026-01-12T07:17:49-05:00
Ignore Windows CI tool directories in Git

Otherwise, we see thousands of changes in `git status` which is very
confusing to work with.

- - - - -
023c301c by sheaf at 2026-01-13T04:57:30-05:00
Don't re-use stack slots for growing registers

This commit avoids re-using a stack slot for a register that has grown
but already had a stack slot.

For example, suppose we have stack slot assigments

  %v1 :: FF64 |-> StackSlot 0
  %v2 :: FF64 |-> StackSlot 1

Later, we start using %v1 at a larger format (e.g. F64x2) and we need
to spill it again. Then we **must not** use StackSlot 0, as a spill
at format F64x2 would clobber the data in StackSlot 1.

This can cause some fragmentation of the `StackMap`, but that's probably
OK.

Fixes #26668

- - - - -
d0966e64 by fendor at 2026-01-13T04:58:11-05:00
Remove `traceId` from ghc-pkg executable

- - - - -
20d7efec by Simon Peyton Jones at 2026-01-13T12:41:22-05:00
Make SpecContr rules fire a bit later

See #26615 and Note [SpecConstr rule activation]

- - - - -
8bc4eb8c by Andrew Lelechenko at 2026-01-13T12:42:03-05:00
Upgrade mtl submodule to 2.3.2

Fixes #26656

- - - - -
c94aaacd by Cheng Shao at 2026-01-13T12:42:44-05:00
compiler: remove iserv and only use on-demand external interpreter

This patch removes `iserv` from the tree completely. Hadrian would no
longer build or distribute `iserv`, and the GHC driver would use the
on-demand external interpreter by default when invoked with
`-fexternal-interpreter`, without needing to specify `-pgmi ""`. This
has multiple benefits:

- It allows cleanup of a lot of legacy hacks in the hadrian codebase.
- It paves the way for running cross ghc's iserv via cross emulator
  (#25523), fixing TH/ghci support for cross targets other than
  wasm/js.

- - - - -
c1fe0097 by Peter Trommler at 2026-01-14T03:54:49-05:00
PPC NCG: Fix shift right MO code

The shift amount in shift right [arithmetic] MOs is machine word
width. Therefore remove unnecessary zero- or sign-extending of
shift amount.

It looks harmless to extend the shift amount argument because the
shift right instruction uses only the seven lowest bits (i. e. mod 128).
But now we have a conversion operation from a smaller type to word width
around a memory load at word width. The types are not matching up but
there is no check done in CodeGen. The necessary conversion from word
width down to the smaller width would be translated into a no-op on
PowerPC anyway. So all seems harmless if it was not for a small
optimisation in getRegister'.

In getRegister' a load instruction with the smaller width of the
conversion operation was generated. This loaded the most significant
bits of the word in memory on a big-endian platform. These bits were
zero and hence shift right was used with shift amount zero and not one
as required in test Sized.

Fixes #26519

- - - - -
2dafc65a by Cheng Shao at 2026-01-14T03:55:31-05:00
Tree-wide cleanup of cygwin logic

GHC has not supported cygwin for quite a few years already, and will
not resume support in the forseeable future. The only supported
windows toolchain is clang64/clangarm64 of the msys2 project. This
patch cleans up the unused cygwin logic in the tree.

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

- - - - -
66b96e2a by Teo Camarasu at 2026-01-14T03:56:13-05:00
Set default eventlog-flush-interval to 5s

Resolves #26707

- - - - -
d0254579 by Andrew Lelechenko at 2026-01-14T03:56:53-05:00
Document when -maxN RTS option was added

- - - - -
f25e2b12 by Cheng Shao at 2026-01-14T11:10:39-05:00
testsuite: remove obsolete --ci option from the testsuite driver

This patch removes the obsolete `--ci` option from the testsuite
driver: neither the CI scripts nor hadrian ever invokes the testsuite
driver with `--ci`, and the perf notes are always fetched to the
`refs/notes/perf` local reference anyway.

- - - - -
7964763b by Julian Ospald at 2026-01-14T11:11:31-05:00
Fix fetch_cabal

* download cabal if the existing one is of an older version
* fix FreeBSD download url
* fix unpacking on FreeBSD

- - - - -
6b0129c1 by Julian Ospald at 2026-01-14T11:11:31-05:00
Bump toolchain in CI

- - - - -
0f53ccc6 by Julian Ospald at 2026-01-14T11:11:31-05:00
Use libffi-clib

Previously, we would build libffi via hadrian
and bundle it manually with the GHC bindist.

This now moves all that logic out of hadrian
and allows us to have a clean Haskell package
to build and link against and ship it without
extra logic.

This patch still retains the ability to link
against a system libffi.

The main reason of bundling libffi was that on
some platforms (e.g. FreeBSD and Mac), system libffi
is not visible to the C toolchain by default,
so users would require settings in e.g. cabal
to be able to compile anything.

This adds the submodule libffi-clib to the repository.

- - - - -
5e1cd595 by Peng Fan at 2026-01-14T11:12:26-05:00
NCG/LA64: add support for la664 micro architecture

Add '-mla664' flag to LA664, which has some new features:
atomic instructions, dbar hints, etc.

'LA464' is the default so that unrecognized instructions are not
generated.

- - - - -
c56567ec by Simon Peyton Jones at 2026-01-15T23:19:04+00:00
Add evals for strict data-con args in worker-functions

This fixes #26722, by adding an eval in a worker for
arguments of strict data constructors, even if the
function body uses them strictly.

See (WIS1) in Note [Which Ids should be strictified]

I took the opportunity to make substantial improvements in the
documentation for call-by-value functions.  See especially
   Note [CBV Function Ids: overview] in GHC.Types.Id.Info
   Note [Which Ids should be CBV candidates?] ditto
   Note [EPT enforcement] in GHC.Stg.EnforceEpt
among others.

- - - - -
9719ce5d by Simon Peyton Jones at 2026-01-15T23:19:04+00:00
Improve `interestingArg`

This function analyses a function's argument to see if it is
interesting enough to deserve an inlining discount. Improvements
for
  * LitRubbish arguments
  * exprIsExpandable arguments

See Note [Interesting arguments] which is substantially rewritten.

- - - - -
7b616b9f by Cheng Shao at 2026-01-16T06:45:00-05:00
compiler: fix regression when compiling foreign stubs in the rts unit

This patch fixes a regression when compiling foreign stubs in the rts
unit introduced in 05e25647f72bc102061af3f20478aa72bff6ff6e. A simple
revert would fix it, but it's better to implement a proper fix with
comment for better understanding of the underlying problem, see the
added comment for explanation.

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

- - - - -
c343ef64 by Sylvain Henry at 2026-01-16T06:45:51-05:00
base: remove GHC.JS.Prim.Internal.Build (#23432)

See accepted CLC proposal https://github.com/haskell/core-libraries-committee/issues/329

- - - - -
29c0aceb by Simon Peyton Jones at 2026-01-16T17:18:11-05:00
Improve newtype unwrapping

Ticket #26746 describes several relatively-minor shortcomings of newtype
unwrapping.  This MR addresses them, while also (arguably) simplifying
the code a bit.

See new Note [Solving newtype equalities: overview]
and     Note [Decomposing newtype equalities]
and     Note [Eager newtype decomposition]
and     Note [Even more eager newtype decomposition]

For some reason, on Windows only, runtime allocations decrease for test
T5205 (from 52k to 48k).  I have not idea why. No change at all on Linux.
I'm just going to accept the change.  (I saw this same effect in another
MR so I think it's a fault in the baseline.)

Metric Decrease:
    T5205

- - - - -
8b59e62c by Andreas Klebinger at 2026-01-16T17:18:52-05:00
testsuite: Widen acceptance window for T5205.

Fixes #26782

- - - - -
9e5e0234 by mangoiv at 2026-01-17T06:03:03-05:00
add a new issue template for getting verified

To reduce spam created by new users, we will in future not grant
any rights but reporting issues to new users. That is why we will
have to be able to verify them. The added issue template serves that
purpose.

- - - - -
b18b2c42 by Cheng Shao at 2026-01-17T06:03:44-05:00
llvm: fix split sections for llvm backend

This patch fixes split sections for llvm backend:

- Pass missing `--data-sections`/`--function-sections` flags to
  llc/opt.
- Use `@llvm.compiler.used` instead of `@llvm.used` to avoid sections
  being unnecessarily retained at link-time.

Fixes #26770.

-------------------------
Metric Decrease:
    libdir
    size_hello_artifact
    size_hello_unicode
-------------------------

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

- - - - -
ebf66f67 by Cheng Shao at 2026-01-17T13:16:50-05:00
Update autoconf scripts

Scripts taken from autoconf a2287c3041a3f2a204eb942e09c015eab00dc7dd

- - - - -
598624b9 by Andreas Klebinger at 2026-01-17T13:17:32-05:00
CString.hs: Update incorrect comment.

Fixes #26322

- - - - -
eea2036b by Cheng Shao at 2026-01-18T10:00:49-05:00
libraries: bump haskeline submodule to 0.8.4.1

This patch bumps the haskeline submodule to 0.8.4.1 which includes an
important fix for an ANSI handling bug on Windows
(https://github.com/haskell/haskeline/pull/126).

- - - - -
87d8f6c2 by Cheng Shao at 2026-01-18T10:01:30-05:00
hadrian: replace default -H32m/-H64m with -O64M to improve mutator productivity

Most hadrian build flavours pass `-H32m`/`-H64m` to GHC as
conventional wisdom to improve mutator productivity and reduce GC
overhead. They were inherited from the legacy Make build system, and
there used to be make flags to instrument a build process with
`-Rghc-timing` option to collect GC stats of each GHC run from stderr.

It's time to revisit whether there are better defaults for
`-H32m`/`-H64m`, and this patch changes it to `-O64M` which indeed
improves mutator productivity based on real statistics. `-O64M` is
more aggressive than `-H64m`; it allows the old generation to grow to
at least 64M before triggering major GC and reduces major GC runs.

The stats of a clean build with `validate` flavour and `-H64m`:

```
h64m.log
  matched RTS stat lines: 5499
  sum MUT cpu     : 2400.808 s
  sum GC cpu      : 1378.292 s
  sum MUT elapsed : 2788.253 s
  sum GC elapsed  : 1389.233 s
  GC/MUT cpu ratio     : 0.574 (GC is 57.4% of MUT)
  GC/MUT elapsed ratio : 0.498 (GC is 49.8% of MUT)
  GC fraction of (MUT+GC) cpu     : 36.5%
  GC fraction of (MUT+GC) elapsed : 33.3%
  per-line GC/MUT cpu ratio: median 0.691, p90 1.777
  per-line GC/MUT elapsed ratio: median 0.519, p90 1.081
```

The stats of a clean build with `validate` flavour and `-O64M`:

```
o64m.log
  matched RTS stat lines: 5499
  sum MUT cpu     : 2377.383 s
  sum GC cpu      : 1127.146 s
  sum MUT elapsed : 2758.857 s
  sum GC elapsed  : 1135.587 s
  GC/MUT cpu ratio     : 0.474 (GC is 47.4% of MUT)
  GC/MUT elapsed ratio : 0.412 (GC is 41.2% of MUT)
  GC fraction of (MUT+GC) cpu     : 32.2%
  GC fraction of (MUT+GC) elapsed : 29.2%
  per-line GC/MUT cpu ratio: median 0.489, p90 1.099
  per-line GC/MUT elapsed ratio: median 0.367, p90 0.806
```

Mutator time is roughly in the same ballpark, but GC CPU time has
reduced by 18.22%, and mutator productivity has increased from 63.5%
to 67.8%.

- - - - -
8372e13d by Cheng Shao at 2026-01-18T10:02:12-05:00
rts: remove unused .def files from rts/win32

This patch removes unused .def files from `rts/win32`, given we don't
build .dll files for rts/ghc-internal/ghc-prim at all. Even when we
resurrect win32 dll support at some point in the future, these .def
files still contain incorrect symbols anyway and won't be of any use.

- - - - -
f6af485d by Cheng Shao at 2026-01-18T10:03:19-05:00
.gitmodules: use gitlab mirror for the libffi-clib submodule

This patch fixes .gitmodules to use the gitlab mirror for the
libffi-clib submodule, to make it coherent with other submodules that
allow ghc developers to experiment with wip branches in submodules for
ghc patches. Fixes #26783.

- - - - -
41432d25 by Cheng Shao at 2026-01-18T10:05:13-05:00
hadrian: remove the horrible i386 speedHack

When hadrian builds certain rts objects for i386, there's a horrible
speedHack that forces -fno-PIC even for dynamic ways of those objects.
This is not compatible with newer versions of gcc/binutils as well as
clang/lld, and this patch removes it. Fixes #26792.

- - - - -
323eb8f0 by Cheng Shao at 2026-01-18T21:48:19-05:00
hadrian: enable split sections for cross stage0

This patch fixes a minor issue with `splitSectionsArgs` in hadrian:
previously, it's unconditionally disabled for stage0 libraries because
it's not going to be shipped in the final bindists. But it's only true
when not cross compiling. So for now we also need to enable it for
cross stage0 as well.

- - - - -
3fadfefe by Andreas Klebinger at 2026-01-18T21:49:01-05:00
RTS: Document -K behaviour better

- - - - -
30f442a9 by Teo Camarasu at 2026-01-20T13:57:26-05:00
base: don't expose GHC.Num.{BigNat, Integer, Natural}

We no longer expose GHC.Num.{BigNat, Integer, Natural} from base instead users should get these modules from ghc-bignum.
We make this change to insulate end users from changes to GHC's implementation of big numbers.
Implements CLC proposal 359: https://github.com/haskell/core-libraries-committee/issues/359

- - - - -
75a9053d by Teo Camarasu at 2026-01-20T13:58:07-05:00
base: deprecate GHC internals in GHC.Num

Implements CLC proposal: https://github.com/haskell/core-libraries-committee/issues/360

- - - - -
9534b032 by Andreas Klebinger at 2026-01-20T13:58:50-05:00
ghc-experimental: Update Changelog

I tried to reconstruct a high level overview of the changes and when
they were made since we introduced it.

Fixes #26506

Co-authored-by: Teo Camarasu <teofilcamarasu@gmail.com>

- - - - -
346f2f5a by Cheng Shao at 2026-01-20T13:59:30-05:00
hadrian: remove RTS options in ghc-in-ghci flavour

This patch removes the RTS options passed to ghc in ghc-in-ghci
flavour, to workaround command line argument handling issue in
hls/hie-boot that results in `-O64M` instead of `+RTS -O64M -RTS`
being passed to ghc. It's not a hadrian bug per se, since ghc's own
ghc-in-ghci multi repl works fine, but we should still make sure HLS
works. Closes #26801.

- - - - -
759fd15a by Andreas Klebinger at 2026-01-21T16:05:28-05:00
Don't build GHC with -Wcompat

Without bumping the boot compiler the warnings it produces are often not
actionable leading to pointless noise.

Fixes #26800

- - - - -
3172db94 by Torsten Schmits at 2026-01-21T16:06:11-05:00
Use the correct field of ModOrigin when formatting error message listing hidden reexports

- - - - -
485c12b2 by Cheng Shao at 2026-01-21T16:06:54-05:00
Revert "hadrian: handle findExecutable "" gracefully"

This reverts commit 1e5752f64a522c4025365856d92f78073a7b3bba. The
underlying issue has been fixed in
https://github.com/haskell/directory/commit/75828696e7145adc09179111a0d631b9...
and present since 1.3.9.0, and hadrian directory lower bound is
1.3.9.0, so we can revert our own in house hack now.

- - - - -
5efb58dc by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: fix typo in TICK_ALLOC_RTS

This patch fixes a typo in the `TICK_ALLOC_RTS` macro, the original
`bytes` argument was silently dropped. The Cmm code has its own
version of `TICK_ALLOC_RTS` not affected by this typo, it affected the
C RTS, and went unnoticed because the variable `n` happened to also be
available at its call site. But the number was incorrect. Also fixes
its call site since `WDS()` is not available in C.

- - - - -
c406ea69 by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: remove broken & unused ALLOC_P_TICKY

This patch removes the `ALLOC_P_TICKY` macro from the rts, it's
unused, and its expanded code is already broken.

- - - - -
34a27e20 by Simon Peyton Jones at 2026-01-21T16:08:17-05:00
Make the implicit-parameter class have representational role

This MR addresses #26737, by making the built-in class IP
have a representational role for its second parameter.

See Note [IP: implicit parameter class] in
  ghc-internal:GHC.Internal.Classes.IP

In fact, IP is (unfortunately, currently) exposed by
base:GHC.Base, so we ran a quick CLC proposal to
agree the change:
  https://github.com/haskell/core-libraries-committee/issues/385

Some (small) compilations get faster because they only need to
load (small) interface file GHC.Internal.Classes.IP.hi,
rather than (large) GHC.Internal.Classes.hi.

Metric Decrease:
    T10421
    T12150
    T12425
    T24582
    T5837
    T5030

- - - - -
ca79475f by Cheng Shao at 2026-01-21T16:09:00-05:00
testsuite: avoid re.sub in favor of simple string replacements

This patch refactors the testsuite driver and avoids the usage of
re.sub in favor of simple string replacements when possible. The
changes are not comprehensive, and there are still a lot of re.sub
usages lingering around the tree, but this already addresses a major
performance bottleneck in the testsuite driver that might has to do
with quadratic or worse slowdown in cpython's regular expression
engine when handling certain regex patterns with large strings.
Especially on i386, and i386 jobs are the bottlenecks of all full-ci
validate pipelines!

Here are the elapsed times of testing x86_64/i386 with -j48 before
this patch:

x86_64: `Build completed in 6m06s`
i386: `Build completed in 1h36m`

And with this patch:

x86_64: `Build completed in 4m55s`
i386: `Build completed in 4m23s`

Fixes #26786.

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

- - - - -
88c93796 by Zubin Duggal at 2026-01-21T16:09:42-05:00
ghc-toolchain: Also configure windres on non-windows platforms.
It may be needed for cross compilation.

Fixes #24588

- - - - -
9788c0ec by Cheng Shao at 2026-01-21T16:10:24-05:00
ghci: print external interpreter trace messages to stderr instead of stdout

This patch makes ghci print external interpreter trace messages to
stderr instead of stdout, which is a much saner choice for diagnostic
information. Closes #26807.

- - - - -
0491f08a by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: don't use CAS without PARALLEL_GC on

If we're not using the parallel GC, there is no reason to do a costly
CAS. This was flagged as taking time in a perf profile.

- - - - -
211a8f56 by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: suffix parallel GC with "par" instead of "thr"

Avoid some potential confusion (see discussion in !15351).

- - - - -
77a23cbd by fendor at 2026-01-22T03:45:08-05:00
Remove blanket ignore that covers libraries/

- - - - -
18bf7f5c by Léana Jiang at 2026-01-22T08:58:45-05:00
doc: update Flavour type in hadrian user-settings

- - - - -
3d5a1365 by Cheng Shao at 2026-01-22T08:59:28-05:00
hadrian: add missing notCross predicate for stage0 -O0

There are a few hard-coded hadrian args that pass -O0 when compiling
some heavy modules in stage0, which only makes sense when not
cross-compiling and when cross-compiling we need properly optimized
stage0 packages. So this patch adds the missing `notCross` predicate
in those places.

- - - - -
ee937134 by Matthew Pickering at 2026-01-22T09:00:10-05:00
Fix ghc-experimental GHC.Exception.Backtrace.Experimental module

This module wasn't added to the cabal file so it was never compiled or
included in the library.

- - - - -
1b490f5a by Zubin Duggal at 2026-01-22T09:00:53-05:00
hadrian: Add ghc-{experimental,internal}.cabal to the list of dependencies of the doc target
We need these files to detect the version of these libraries

Fixes #26738

- - - - -
cdb74049 by Cheng Shao at 2026-01-22T14:52:36-05:00
rts: avoid Cmm loop to initialize Array#/SmallArray#

Previously, `newArray#`/`newSmallArray#` called an RTS C function to
allocate the `Array#`/`SmallArray#`, then used a Cmm loop to
initialize the elements. Cmm doesn't have native for-loop so the code
is a bit awkward, and it's less efficient than a C loop, since the C
compiler can effectively vectorize the loop with optimizations.

So this patch moves the loop that initializes the elements to the C
side. `allocateMutArrPtrs`/`allocateSmallMutArrPtrs` now takes a new
`init` argument and initializes the elements if `init` is non-NULL.

- - - - -
4c784f00 by Cheng Shao at 2026-01-22T14:53:19-05:00
Fix testsuite run for +ipe flavour transformer

This patch makes the +ipe flavour transformer pass the entire
testsuite:

- An RTS debug option `-DI` is added, the IPE trace information is now
  only printed with `-DI`. The test cases that do require IPE trace
  are now run with `-DI`.
- The testsuite config option `ghc_with_ipe` is added, enabled when
  running the testsuite with `+ipe`, which skips a few tests that are
  sensitive to eventlog output, allocation patterns etc that can fail
  under `+ipe`.

This is the first step towards #26799.

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

- - - - -
be8e5236 by Ben Gamari at 2026-01-23T03:28:45-05:00
hadrian: Bump QuickCheck upper bound

This patch bumps QuickCheck upper bound to 2.18. selftest rule
manually tested to work with current latest QuickCheck-2.17.1.0.

- - - - -
5aa328fb by Zubin Duggal at 2026-01-23T03:29:30-05:00
Add genindex to index.rst. This adds a link to the index in the navigation bar.

Fixes #26437

- - - - -
917ab8ff by Oleg Grenrus at 2026-01-23T10:52:55-05:00
Export labelThread from Control.Concurrent

- - - - -
3f5e8d80 by Cheng Shao at 2026-01-23T10:53:37-05:00
ci: only push perf notes on master/release branches

This patch fixes push_perf_notes logic in ci.sh to only push perf
notes on master/release branches. We used to unconditionally push perf
notes even in MRs, but the perf numbers in the wip branches wouldn't
be used as baseline anyway, plus this is causing a space leak in the
ghc-performance-notes repo. See #25317 for the perf notes repo size
problem.

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

- - - - -
414b9593 by Cheng Shao at 2026-01-24T07:11:51-05:00
ci: remove duplicate keys in .gitlab-ci.yml

This patch removes accidentally duplicate keys in `.gitlab-ci.yml`.
The YAML spec doesn't allow duplicate keys in the first place, and
according to GitLab docs
(https://docs.gitlab.com/ci/yaml/yaml_optimization/#anchors), the
latest key overrides the earlier entries.

- - - - -
e5cb5491 by Cheng Shao at 2026-01-24T07:12:34-05:00
hadrian: drop obsolete configure/make builder logic for libffi

This patch drops obsolete hadrian logic around `Configure
libffiPath`/`Make libffiPath` builders, they are no longer needed
after libffi-clib has landed. Closes #26815.

- - - - -
2d160222 by Simon Hengel at 2026-01-24T07:13:17-05:00
Fix typo in roles.rst
- - - - -
56db94f7 by Peter Trommler at 2026-01-26T11:26:18+01:00
PPC NCG: Generate clear right insn at arch width

The clear right immediate (clrrxi) is only available in word and
doubleword width. Generate clrrxi instructions at architecture
width for all MachOp widths.

Fixes #24145

- - - - -
5957a8ad by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00
Add operations for obtaining operating-system handles

This contribution implements CLC proposal #369. It adds operations for
obtaining POSIX file descriptors and Windows handles that underlie
Haskell handles. Those operating system handles can also be obtained
without such additional operations, but this is more involved and, more
importantly, requires using internals.

- - - - -
86a0510c by Greg Steuck at 2026-01-27T06:12:34-05:00
Move flags to precede patterns for grep and read files directly

This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools.
There's no reason to use cat and pipe where direct file argument works.

- - - - -
50761451 by Cheng Shao at 2026-01-27T21:51:23-05:00
ci: update darwin boot ghc to 9.10.3

This patch updates darwin boot ghc to 9.10.3, along with other related
updates, and pays off some technical debt here:

- Update `nixpkgs` and use the `nixpkgs-25.05-darwin` channel.
- Update the `niv` template.
- Update LLVM to 21 and update `llvm-targets` to reflect LLVM 21
  layout changes for arm64/x86_64 darwin targets.
- Use `stdenvNoCC` to prevent nix packaged apple sdk from being used
  by boot ghc, and manually set `DEVELOPER_DIR`/`SDKROOT` to enforce
  the usage of system-wide command line sdk for macos.
- When building nix derivation for boot ghc, run `configure` via the
  `arch` command so that `configure` and its subprocesses pick up the
  manually specified architecture.
- Remove the previous horrible hack that obliterates `configure` to
  make autoconf test result in true. `configure` now properly does its
  job.
- Remove the now obsolete configure args and post install settings
  file patching logic.
- Use `scheme-small` for texlive to avoid build failures in certain
  unused texlive packages, especially on x86_64-darwin.

- - - - -
94dcd15e by Matthew Pickering at 2026-01-27T21:52:05-05:00
Evaluate backtraces for "error" exceptions at the moment they are thrown

See Note [Capturing the backtrace in throw] and
Note [Hiding precise exception signature in throw] which explain the
implementation.

This commit makes `error` and `throw` behave the same with regard to
backtraces. Previously, exceptions raised by `error` would not contain
useful IPE backtraces.

I did try and implement `error` in terms of `throw` but it started to
involve putting diverging functions into hs-boot files, which seemed to
risky if the compiler wouldn't be able to see if applying a function
would diverge.

CLC proposal: https://github.com/haskell/core-libraries-committee/issues/383

Fixes #26751

- - - - -
ef35e3ea by Teo Camarasu at 2026-01-27T21:52:46-05:00
ghc-internal: move all Data instances to Data.Data

Most instances of Data are defined in GHC.Internal.Data.Data.
Let's move all remaining instance there.

This moves other modules down in the dependency hierarchy allowing for
more parallelism, and it decreases the likelihood that we would need to
load this heavy .hi file if we don't actually need it.

Resolves #26830

Metric Decrease:
    T12227
    T16875

- - - - -
5e0ec555 by sheaf at 2026-01-28T06:56:38-05:00
Add test case for #25679

This commit adds the T25679 test case. The test now passes, thanks to
commit 1e53277af36d3f0b6ad5491f70ffc5593a49dcfd.

Fixes #25679

- - - - -
f1cd1611 by sheaf at 2026-01-28T06:56:38-05:00
Improve defaulting of representational equalities

This commit makes the defaulting of representational equalities, introduced
in 1e53277a, a little bit more robust. Now, instead of calling the eager
unifier, it calls the full-blown constraint solver, which means that it can
handle some subtle situations, e.g. involving functional dependencies and
type-family injectivity annotations, such as:

  type family F a = r | r -> a
  type instance F Int = Bool

  [W] F beta ~R Bool

- - - - -
25edf516 by sheaf at 2026-01-28T06:56:38-05:00
Improve errors for unsolved representational equalities

This commit adds a new field of CtLoc, CtExplanations, which allows the
typechecker to leave some information about what it has done. For the moment,
it is only used to improve error messages for unsolved representational
equalities. The typechecker will now accumulate, when unifying at
representational role:

  - out-of-scope newtype constructors,
  - type constructors that have nominal role in a certain argument,
  - over-saturated type constructors,
  - AppTys, e.g. `c a ~R# c b`, to report that we must assume that 'c' has
    nominal role in its parameters,
  - data family applications that do not reduce, potentially preventing
    newtype unwrapping.

Now, instead of having to re-construct the possible errors after the fact,
we simply consult the CtExplanations field.

Additionally, this commit modifies the typechecker error messages that
concern out-of-scope newtype constructors. The error message now depends
on whether we have an import suggestion to provide to the user:

  - If we have an import suggestion for the newtype constructor,
    the message will be of the form:

      The data constructor MkN of the newtype N is out of scope
      Suggested fix: add 'MkN' to the import list in the import of 'M'

  - If we don't have any import suggestions, the message will be
    of the form:

      NB: The type 'N' is an opaque newtype, whose constructor is hidden

Fixes #15850, #20289, #20468, #23731, #25949, #26137

- - - - -
4d0e6da1 by Simon Peyton Jones at 2026-01-28T06:57:19-05:00
Fix two bugs in short-cut constraint solving

There are two main changes here:

* Use `isSolvedWC` rather than `isEmptyWC` in `tryShortCutSolver`
  The residual constraint may have some fully-solved, but
  still-there implications, and we don't want them to abort short
  cut solving!  That bug caused #26805.

* In the short-cut solver, we abandon the fully-solved residual
  constraint; but we may thereby lose track of Givens that are
  needed, and either report them as redundant or prune evidence
  bindings that are in fact needed.

  This bug stopped the `constraints` package from compiling;
  see the trail in !15389.

The second bug led me to (another) significant refactoring
of the mechanism for tracking needed EvIds.   See the new
   Note [Tracking needed EvIds] in GHC.Tc.Solver.Solve
It's simpler and much less head-scratchy now.

Some particulars:

* An EvBindsVar now tracks NeededEvIds

* We deal with NeededEvIds for an implication only when it is
  fully solved.  Much simpler!

* `tryShortCutTcS` now takes a `TcM WantedConstraints` rather than
  `TcM Bool`, so that is can plumb the needed EvIds correctly.

* Remove `ic_need` and `ic_need_implic` from Implication (hooray),
  and add `ics_dm` and `ics_non_dm` to `IC_Solved`.

Pure refactor
* Shorten data constructor `CoercionHole` to `CH`, following
  general practice in GHC.
* Rename `EvBindMap` to `EvBindsMap` for consistency

- - - - -
662480b7 by Cheng Shao at 2026-01-28T06:58:00-05:00
ci: use debian validate bindists instead of fedora release bindists in testing stage

This patch changes the `abi-test`, `hadrian-multi` and `perf` jobs in
the full-ci pipeline testing stage to use debian validate bindists
instead of fedora release bindists, to increase pipeline level
parallelism and allow full-ci pipelines to complete earlier. Closes #26818.

- - - - -
39581ec6 by Cheng Shao at 2026-01-28T06:58:40-05:00
ci: run perf test with -j$cores

This patch makes the perf ci job compile Cabal with -j$cores to speed
up the job.

- - - - -
607b287b by Wolfgang Jeltsch at 2026-01-28T15:41:53+02:00
Remove `GHC.Desugar` from `base`

`GHC.Desugar` was deprecated and should have been removed in GHC 9.14.
However, the removal was forgotten, although there was a code block that
was intended to trigger a compilation error when the GHC version in use
was 9.14 or later. This code sadly didn’t work, because the
`__GLASGOW_HASKELL__` macro was misspelled as `__GLASGOW_HASKELL`.

- - - - -
e8f5a45d by sterni at 2026-01-29T04:19:18-05:00
users_guide: fix runtime error during build with Sphinx 9.1.0

Appears that pathto is stricter about what it accepts now.
Tested Sphinx 8.2.3 and 9.1.0 on the ghc-9.10 branch.

Resolves #26810.

Co-authored-by: Martin Weinelt <hexa@darmstadt.ccc.de>

- - - - -
ce2d62fb by Jessica Clarke at 2026-01-29T19:48:51-05:00
PPC NCG: Use libcall for 64-bit cmpxchg on 32-bit PowerPC

There is no native instruction for this, and even if there were a
register pair version we could use, the implementation here is assuming
the values fit in a single register, and we end up only using / defining
the low halves of the registers.

Fixes: b4d39adbb5 ("PrimOps: Add CAS op for all int sizes")
Fixes: #23969

- - - - -
43d97761 by Michael Karcher at 2026-01-29T19:49:43-05:00
NCG for PPC: add pattern for CmmRegOff to iselExpr64

Closes #26828
- - - - -
aeeb4a20 by Matthew Pickering at 2026-01-30T11:42:47-05:00
determinism: Use deterministic map for Strings in TyLitMap

When generating typeable evidence the types we need evidence for all
cached in a TypeMap, the order terms are retrieved from a type map
determines the order the bindings appear in the program.

A TypeMap is quite diligent to use deterministic maps, apart from in the
TyLitMap, which uses a UniqFM for storing strings, whose ordering
depends on the Unique of the FastString.

This can cause non-deterministic .hi and .o files.

An unexpected side-effect is the error message but RecordDotSyntaxFail8
changing. I looked into this with Sam and this change caused the
constraints to be solved in a different order which results in a
slightly different error message. I have accepted the new test, since
the output before was non-deterministic and the new output is consistent
with the other messages in that file.

Fixes #26846

- - - - -
9e4d70c2 by Andrew Lelechenko at 2026-01-30T11:43:29-05:00
Upgrade text submodule to 2.1.4

- - - - -
631fa5ae by Recursion Ninja at 2026-01-31T22:30:11+00:00
Decouple `L.S.H.Decls` from importing `GHC.Types.Basic`

Data-types within `GHC.Types.Basic` which describe components of
the AST are migrated to `Language.Haskell.Syntax.Basic`. Related
function definitions are also moved.

Types moved to L.H.S. because they are part of the AST:
  * TopLevelFlag
  * RuleName

Types moved from L.H.S. to GHC.Hs. because they are not needed in the AST:
  * TyConFlavour
  * TypeOrData
  * NewOrData

Migrated instances:
  * `Outputable` instances moved to in `GHC.Utils.Outputable`
  * `Binary` instance of `Boxity` moved to to `GHC.Utils.Binary`
  * Other `Binary` instances are orphans to be migrated later.

The `OverlapMode` data-type is given a TTG extension point.
The `OverlapFlag` data-type, which depends on `OverlapMode`,
is updated to support `OverlapMode` with a GHC "pass" type paramerter.
In order to avoid module import cycles, `OverlapMode` and `OverlapFlag`
are migrated to new modules (no way around this).

  * Migrated `OverlapMode` to new module `Language.Haskell.Syntax.Overlap`
  * Migrated `OverlapFlag` to new module `GHC.Hs.Decls.Overlap`

- - - - -
9769cc03 by Simon Hengel at 2026-02-01T04:21:03-05:00
Update the documentation for MultiWayIf (fixes #25376)

(so that it matches the implementation)

- - - - -
5fc9442a by Peter Trommler at 2026-02-01T04:21:44-05:00
hadrian: Fix dependency generation for assembler

Assembler files allow # for comments unless in column 1. A modern
cpp for C treats those a preprocessor directives. We tell gcc that
a .S file is assembler with cpp and not C.

Fixes #26819

- - - - -
269c4087 by Simon Peyton Jones at 2026-02-01T19:38:10-05:00
Include current phase in the range for rule/unfoldings

This MR fixes a bad loop in the compiler: #26826.

The fix is to add (WAR2) to
   Note [What is active in the RHS of a RULE or unfolding?]
in GHC.Core.Opt.Simplify.Utils

- - - - -
ddf1434f by Vladislav Zavialov at 2026-02-01T19:38:52-05:00
Refactor: merge HsMultilineString into HsString (#26860)

Before this patch, HsLit defined two separate constructors to represent
single-line and multi-line strings:

	data HsLit x
	  ...
	  | HsString (XHsString x) FastString
	  | HsMultilineString (XHsMultilineString x) FastString

I found this to be an unnecessary complication and an obstacle to unifying
HsLit with HsTyLit. Now we use HsString for both kinds of literals.

One user-facing change here is `ppr (HsString st s)` behaving differently for
single-line strings containing newlines:

	x = "first line \
	    \asdf\n\
	    \second line"

Previously, the literal was fed to `ftext` with its newlines, producing an
ill-formed SDoc. This issue is now addressed by using `split` for both
single-line and multi-line strings:

	vcat $ map text $ split '\n' (unpackFS src)

See the parser/should_fail/T26860ppr test.

In addition (and unrelatedly to the main payload of this patch),
drop the unused pmPprHsLit helper.

- - - - -
2b4f463c by Simon Peyton Jones at 2026-02-02T17:32:32+00:00
Remove exprIsCheap from doFloatFromRhs

See #26854 and Note [Float when expandable]

This patch simplifies the code, by removing an extra unnecessary test.

- - - - -
9db7f21f by Brandon Chinn at 2026-02-03T09:15:10-05:00
Refactor: make function patterns exhaustive

Also added missing (==) logic for:
  * HsMultilineString
  * HsInt{8,16,32}
  * HsWord{8,16,32}

- - - - -
aa9c5e2c by Hécate Kleidukos at 2026-02-03T15:58:35-05:00
driver: Hide source paths at verbosity level 1 by default

- - - - -
c64cca1e by mangoiv at 2026-02-03T15:59:29-05:00
ExplicitLevelImports: check staging for types just like for values

Previously, imported types were entirely exempted from staging checks as
the implicit stage persistance assumed to be all imported types to be
well staged. ExplicitLevelImports' change specification, however, does
not do such an exemption. Thus we want to introduce such a check, just
like we have for values.
ExplicitLevelImports does not, however, talk about local names - from
its perspective, we could theoretically keep treating locally introduced
types specially - e.g. an ill-staged used in a quote would only emit a
warning, not an error. To allow for a potential future migration away
from such wrinkles as the staging check in notFound
(see  Note [Out of scope might be a staging error]) we consistently do
the strict staging check that we also do for value if ExplicitLevelImports
is on.

Closes #26098

- - - - -
5f0dbeb6 by Simon Hengel at 2026-02-03T16:00:12-05:00
Use Haddock formatting in deprecation message of `initNameCache`
- - - - -
01ecb612 by Andreas Klebinger at 2026-02-04T09:56:25-05:00
testsuite: Explicitly use utf-8 encoding in rts-includes linter.

Not doing so caused failures on windows, as python failed to pick a
reasonable encoding even with locale set.

Fixes #26850

- - - - -
ea0d1317 by Zubin Duggal at 2026-02-04T09:57:06-05:00
Bump transformers submodule to 0.6.3.0

Fixes #26790

- - - - -
cbe4300e by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix subtle bug in GHC.Core.Utils.mkTick

This patch fixes a decade-old bug in `mkTick`, which
could generate type-incorrect code!  See the diagnosis
in #26772.

The new code is simpler and easier to understand.
(As #26772 says, I think it could be improved further.)

- - - - -
a193a8da by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Modify a debug-trace in the Simplifier

...just to show a bit more information.

- - - - -
b579dfdc by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix long-standing interaction between ticks and casts

The code for Note [Eliminate Identity Cases] was simply wrong when
ticks and casts interacted.  This patch fixes the interaction.

It was shown up when validating #26772, although it's not the exactly
the bug that's reported by #26772.  Nor is it easy to reproduce, hence
no regression test.

- - - - -
fac0de1e by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump Cabal submodule to 3.16.1.0

- - - - -
00589122 by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump deepseq submodule to 1.5.2.0

Also:

- Get rid of usage of deprecated `NFData` function instance in the
  compiler
- `T21391` still relies on `NFData` function instance, add
  `-Wno-deprecations` for the time being.

- - - - -
84474c71 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump directory submodule to 1.3.10.1

- - - - -
1a9f4662 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump exceptions submodule to 0.10.12

- - - - -
2e39a340 by Peng Fan at 2026-02-07T03:42:01-05:00
NCG/LA64: adjust register usage to avoid src-register being clobbered

- - - - -
9faf1b35 by Teo Camarasu at 2026-02-07T03:42:43-05:00
ghc-internal: Delete unnecessary GHC.Internal.Data.Ix

This module merely re-exports GHC.Internal.Ix. It was copied from
`base` when `ghc-internal` was split, but there is no reason to have
this now. So, let's delete it.

Resolves #26848

- - - - -
d112b440 by Sven Tennie at 2026-02-07T10:47:56-05:00
Add cabal.project file to generate-ci

This fixes the HLS setup for our CI code generation script
(generate-ci).

The project file simply makes `generate-ci` of the cabal file
discoverable.

- - - - -
5339f6f0 by Andreas Klebinger at 2026-02-07T10:48:40-05:00
CI: Don't collapse test results.

This puts test output back into the primary test log instead of a
subsection removing the need to expand a section to see test results.

While the intention was good in practice the old behaviour mostly wastes time
by requiring expansion of the section.

Fixes #26882

- - - - -
0e1cd2e0 by Evan Piro at 2026-02-08T10:35:16-08:00
Linker.MacOS reduce dynflags import

- - - - -
1c79a4cd by Michael Alan Dorman at 2026-02-09T08:11:51-05:00
Remove `extra_src_files` variable from `testsuite/driver/testlib.py`

While reading through the test harness code, I noticed this variable
with a TODO attached that referenced #12223.  Although that bug is
closed, it strongly implied that this special-case variable that only
affected a single test was expected to be removed at some point.

I also looked at 3415bcaa0b1903b5e12dfaadb5b774718e406eab---where it
was added---whose commit message suggested that it would have been
desirable to remove it, but that there were special circumstances that
meant it had to remain (though it doesn't elucidate what those special
circumstances are).

However, the special circumstances were mentioned as if the test was
in a different location than is currently is, so I decided to try
changing the test to use the standard `extra_files` mechanism, which
works in local testing.

This also seems like a reasonable time to remove the script that was
originally used in the transition, since it doesn't really serve a
purpose anymore.

- - - - -
0020e38a by Matthew Pickering at 2026-02-09T17:29:14-05:00
determinism: Use a stable sort in WithHsDocIdentifiers binary instance

`WithHsDocIdentifiers` is defined as

```
 71 data WithHsDocIdentifiers a pass = WithHsDocIdentifiers
 72   { hsDocString      :: !a
 73   , hsDocIdentifiers :: ![Located (IdP pass)]
 74   }
```

This list of names is populated from `rnHsDocIdentifiers`, which calls
`lookupGRE`, which calls `lookupOccEnv_AllNameSpaces`, which calls
`nonDetEltsUFM` and returns the results in an order depending on
uniques.

Sorting the list with a stable sort before returning the interface makes
the output deterministic and follows the approach taken by other fields
in `Docs`.

Fixes #26858

- - - - -
89898ce6 by echoumcp1 at 2026-02-09T17:30:01-05:00
Replace putstrln with logMsg in handleSeqHValueStatus

Fixes #26549

- - - - -
7c52c4f9 by John Paul Adrian Glaubitz at 2026-02-10T13:52:43-05:00
rts: Switch prim to use modern atomic compiler builtins

The __sync_*() atomic compiler builtins have been deprecated in GCC
for a while now and also don't provide variants for 64-bit values
such as __sync_fetch_and_add_8().

Thus, replace them with the modern __atomic_*() compiler builtins and
while we're at it, also drop the helper macro CAS_NAND() which is now
no longer needed since we stopped using the __sync_*() compiler builtins
altogether.

Co-authored-by: Ilias Tsitsimpis <iliastsi@debian.org>

Fixes #26729

- - - - -
cf60850a by Recursion Ninja at 2026-02-10T13:53:27-05:00
Decoupling L.H.S.Decls from GHC.Types.ForeignCall

  - Adding TTG extension point for 'CCallTarget'
  - Adding TTG extension point for 'CType'
  - Adding TTG extension point for 'Header'
  - Moving ForeignCall types that do not need extension
    to new L.H.S.Decls.Foreign module
  - Replacing 'Bool' parameters with descriptive data-types
    to increase clairty and prevent "Boolean Blindness"

- - - - -
11a04cbb by Eric Lee at 2026-02-11T09:20:46-05:00
Derive Semigroup/Monoid for instances believed could be derived in #25871

- - - - -
15d9ce44 by Eric Lee at 2026-02-11T09:20:46-05:00
add Ghc.Data.Pair deriving

- - - - -
c85dc170 by Evan Piro at 2026-02-11T09:21:45-05:00
Linker.MacOS reduce options import

- - - - -
a541dd83 by Chris Wendt at 2026-02-11T16:06:41-05:00
Initialize plugins for `:set +c` in GHCi

Fixes #23110.

- - - - -
0f5a73bc by Cheng Shao at 2026-02-11T16:07:27-05:00
compiler: add Binary Text instance

This patch adds `Binary` instance for strict `Text`, in preparation of
making `Text` usable in certain GHC API use cases (e.g. haddock). This
also introduces `text` as a direct dependency of the `ghc` package.

- - - - -
9e58b8a1 by Cheng Shao at 2026-02-11T16:08:10-05:00
ghc-toolchain: add C11 check

This patch partially reverts commit
b8307eab80c5809df5405d76c822bf86877f5960 that removed C99 check in
autoconf/ghc-toolchain. Now we:

- No longer re-implement `FP_SET_CFLAGS_C11` similar to
  `FP_SET_CFLAGS_C99` in the past, since autoconf doesn't provide a
  convenient `AC_PROG_CC_C11` function. ghc-toolchain will handle it
  anyway.
- The Cmm CPP C99 check is relanded and repurposed for C11.
- The C99 logic in ghc-toolchain is relanded and repurposed for C11.
- The C99 check in Stg.h is corrected to check for C11. The obsolete
  _ISOC99_SOURCE trick is dropped.
- Usages of `-std=gnu99` in the testsuite are corrected to use
  `-std=gnu11`.

Closes #26908.

- - - - -
4df0adf6 by Simon Peyton Jones at 2026-02-11T21:50:13-05:00
Simplify the treatment of static forms

This MR implements GHC proposal 732: simplify static forms,
   https://github.com/ghc-proposals/ghc-proposals/pull/732
thereby addressing #26556.

See `Note [Grand plan for static forms]` in GHC.Iface.Tidy.StaticPtrTable

The main changes are:

* There is a new, simple rule for (static e), namely that the free
  term variables of `e` must be bound at top level.  The check is
  done in the `HsStatic` case of `GHC.Rename.Expr.rnExpr`

* That in turn substantially simplifies the info that the typechecker
  carries around in its type environment.  Hooray.

* The desugarer emits static bindings to top level directly; see the
  `HsStatic` case of `dsExpr`.

* There is no longer any special static-related magic in the FloatOut
  pass.  And the main Simplifier pipeline no longer needs a special case
  to run FloatOut even with -O0.  Hooray.

All this forced an unexpected change to the pattern match checker. It
recursively invokes the main Hs desugarer when it wants to take a look
at a term to spot some special cases (notably constructor applications).
We don't want to emit any nested (static e) bindings to top level a
second time!  Yikes.

That forced a modest refactor in GHC.HsToCore.Pmc:

* The `dsl_nablas` field of `DsLclEnv` now has a `NoPmc` case, which says
  "I'm desugaring just for pattern-match checking purposes".

* When that flag is set we don't emit static binds.

That in turn forces a cascade of refactoring, but the net effect is an
improvement; less risk of duplicated (even exponential?) work.

See Note [Desugaring HsExpr during pattern-match checking].

10% metric decrease, on some architectures, of compile-time max-bytes-used on T15304.

Metric Decrease:
    T15304

- - - - -
7922f728 by Teo Camarasu at 2026-02-11T21:50:58-05:00
ghc-internal: avoid depending on GHC.Internal.Exts

This module is mostly just re-exports. It made sense as a user-facing
module, but there's no good reason ghc-internal modules should depend on
it and doing so linearises the module graph

- move considerAccessible to GHC.Internal.Magic

Previously it lived in GHC.Internal.Exts, but it really deserves to live
along with the other magic function, which are already re-exported from .Exts

- move maxTupleSize to GHC.Internal.Tuple

This previously lived in GHC.Internal.Exts but a comment already said it
should be moved to .Tuple

Resolves #26832

- - - - -
b6a4a29b by Eric Lee at 2026-02-11T21:51:55-05:00
Remove unused Semigroup imports to fix GHC 9.14 bootstrapping

- - - - -
99d8c146 by Simon Peyton Jones at 2026-02-12T17:36:59+00:00
Fix subtle bug in cast worker/wrapper

See (CWw4) in Note [Cast worker/wrapper].

The true payload is in the change to the definition of
   GHC.Types.Id.Info.hasInlineUnfolding
Everthing else is just documentation.

There is a 2% compile time decrease for T13056;
I'll take the win!

Metric Decrease:
    T13056

- - - - -
530e8e58 by Simon Peyton Jones at 2026-02-12T20:17:23-05:00
Add regression tests for four StaticPtr bugs

Tickets #26545, #24464, #24773, #16981 are all solved by the
recently-landed MR

    commit 318ee13bcffa6aa8df42ba442ccd92aa0f7e210c
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Mon Oct 20 23:07:20 2025 +0100

    Simplify the treatment of static forms

This MR just adds regression tests for them.

- - - - -
4157160f by Cheng Shao at 2026-02-13T06:27:04-05:00
ci: remove unused hlint-ghc-and-base job definition

This patch removes the unused `hlint-ghc-and-base` job definition,
it's never run since !9806. Note that hadrian lint rules still work
locally, so anyone that wishes to run hlint on the codebase can
continue to do so in their local worktree.

- - - - -
039f1977 by Cheng Shao at 2026-02-13T06:27:47-05:00
wasm: use import.meta.main for proper distinction of nodejs main modules

This patch uses `import.meta.main` for proper distinction of nodejs
main modules, especially when the main module might be installed as a
symlink. Fixes #26916.

- - - - -
14f485ee by ARATA Mizuki at 2026-02-17T09:09:24+09:00
Support more x86 extensions: AVX-512 {BW,DQ,VL} and GFNI

Also, mark AVX-512 ER and PF as deprecated.

AVX-512 instructions can be used for certain 64-bit integer vector operations.

GFNI can be used to implement bitReverse (currently not used by NCG, but LLVM may use it).

Closes #26406
Addresses #26509

- - - - -
016f79d5 by fendor at 2026-02-17T09:16:16-05:00
Hide implementation details from base exception stack traces

Ensure we hide the implementation details of the exception throwing mechanisms:

* `undefined`
* `throwSTM`
* `throw`
* `throwIO`
* `error`

The `HasCallStackBacktrace` should always have a length of exactly 1,
not showing internal implementation details in the stack trace, as these
are vastly distracting to end users.

CLC proposal [#387](https://github.com/haskell/core-libraries-committee/issues/387)

- - - - -
4f2840f2 by Brian J. Cardiff at 2026-02-17T17:04:08-05:00
configure: Accept happy-2.2

In Jan 2026 happy-2.2 was released. The most sensible change is https://github.com/haskell/happy/issues/335 which didn't trigger in a fresh build

- - - - -
10b4d364 by Duncan Coutts at 2026-02-17T17:04:52-05:00
Fix errors in the documentation of the eventlog STOP_THREAD status codes

Fix the code for BlockedOnMsgThrowTo.

Document all the known historical warts.

Fixes issue #26867

- - - - -
c5e15b8b by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: use snippets for all list examples

- generate snippet output for docs
- reduce font size to better fit snippets
- Use only directive to guard html snippets
- Add latex snippets for lists

- - - - -
d388bac1 by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: Place the snippet input and output together

- Put the output seemingly inside the example box

- - - - -
016fa306 by Samuel Thibault at 2026-02-18T05:08:35-05:00
Fix linking against libm by moving the -lm option

For those systems that need -lm for getting math functions, this is
currently added on the link line very early, before the object files being
linked together. Newer toolchains enable --as-needed by default, which means
-lm is ignored at that point because no object requires a math function
yet. With such toolchains, we thus have to add -lm after the objects, so the
linker actually includes libm in the link.

- - - - -
68bd0805 by Teo Camarasu at 2026-02-18T05:09:19-05:00
ghc-internal:  Move GHC.Internal.Data.Bool to base

This is a tiny module that only defines bool :: Bool -> a -> a -> a. We can just move this to base and delete it from ghc-internal. If we want this functionality there we can just use a case statement or if-then expression.

Resolves 26865

- - - - -
4c40df3d by fendor at 2026-02-20T10:24:48-05:00
Add optional `SrcLoc` to `StackAnnotation` class

`StackAnnotation`s give access to an optional `SrcLoc` field that
user-added stack annotations can use to provide better backtraces in both error
messages and when decoding the callstack.

We update builtin stack annotations such as `StringAnnotation` and
`ShowAnnotation` to also capture the `SrcLoc` of the current `CallStack`
to improve backtraces by default (if stack annotations are used).

This change is backwards compatible with GHC 9.14.1.

- - - - -
fd9aaa28 by Simon Hengel at 2026-02-20T10:25:33-05:00
docs: Fix grammar in explicit_namespaces.rst

- - - - -
44354255 by Vo Minh Thu at 2026-02-20T18:53:06-05:00
GHCi: add a :version command.

This looks like:

    ghci> :version
    GHCi, version 9.11.20240322

This closes #24576.

Co-Author: Markus Läll <markus.l2ll@gmail.com>

- - - - -
eab3dbba by Andreas Klebinger at 2026-02-20T18:53:51-05:00
hadrian/build-cabal: Better respect and utilize -j

* We now respect -j<n> for the cabal invocation to build hadrian rather
  than hardcoding -j
* We use the --semaphore flag to ensure cabal/ghc build the hadrian
  executable in parallel using the -jsem mechanism.

Saves 10-15s on fresh builds for me.

Fixes #26876

- - - - -
17839248 by Teo Camarasu at 2026-02-24T08:36:03-05:00
ghc-internal: avoid depending on GHC.Internal.Control.Monad.Fix

This module contains the definition of MonadFix, since we want an
instance for IO, that instance requires a lot of machinery and we want
to avoid an orphan instance, this will naturally be quite high up in the
dependency graph.

So we want to avoid other modules depending on it as far as possible.

On Windows, the IO manager depends on the RTSFlags type, which
transtively depends on MonadFix. We refactor things to avoid this
dependency, which would have caused a regression.

Resolves #26875

Metric Decrease:
    T12227

- - - - -
fa88d09a by Wolfgang Jeltsch at 2026-02-24T08:36:47-05:00
Refine the imports of `System.IO.OS`

Commit 68bd08055594b8cbf6148a72d108786deb6c12a1 replaced the
`GHC.Internal.Data.Bool` import by a `GHC.Internal.Base` import.
However, while the `GHC.Internal.Data.Bool` import was conditional and
partial, the `GHC.Internal.Base` import is unconditional and total. As a
result, the import list is not tuned to import only the necessary bits
anymore, and furthermore GHC emits a lot of warnings about redundant
imports.

This commit makes the `GHC.Internal.Base` import conditional and partial
in the same way that the `GHC.Internal.Data.Bool` import was.

- - - - -
c951fef1 by Cheng Shao at 2026-02-25T20:58:28+00:00
wasm: add /assets endpoint to serve user-specified assets

This patch adds an `/assets` endpoint to the wasm dyld http server, so
that users can also fetch assets from the same host with sensible
default MIME types, without needing a separate http server for assets
that also introduces CORS headaches:

- A `-fghci-browser-assets-dir` driver flag is added to specify the
  assets root directory (defaults to `$PWD`)
- The dyld http server fetches `mime-db` on demand and uses it as
  source of truth for mime types.

Closes #26951.

- - - - -
dde22f97 by Sylvain Henry at 2026-02-26T13:14:03-05:00
Fix -fcheck-prim-bounds for non constant args (#26958)

Previously we were only checking bounds for constant (literal)
arguments!

I've refactored the code to simplify the generation of out-of-line Cmm
code for the primop composed of some inline code + some call to an
external Cmm function.

- - - - -
bd3eba86 by Vladislav Zavialov at 2026-02-27T05:48:01-05:00
Check for negative type literals in the type checker (#26861)

GHC disallows negative type literals (e.g., -1), as tested by T8306 and
T8412. This check is currently performed in the renamer:

  rnHsTyLit tyLit@(HsNumTy x i) = do
    when (i < 0) $
      addErr $ TcRnNegativeNumTypeLiteral tyLit

However, this check can be bypassed using RequiredTypeArguments
(see the new test case T26861). Prior to this patch, such programs
caused the compiler to hang instead of reporting a proper error.
This patch addresses the issue by adding an equivalent check in
the type checker, namely in tcHsType.

The diff is deliberately minimal to facilitate backporting. A more
comprehensive rework of HsTyLit is planned for a separate commit.

- - - - -
faf14e0c by Vladislav Zavialov at 2026-02-27T05:48:45-05:00
Consistent pretty-printing of HsString, HsIsString, HsStrTy

Factor out a helper to pretty-print string literals, thus fixing newline
handling for overloaded string literals and type literals.

Test cases: T26860ppr T26860ppr_overloaded T26860ppr_tylit

Follow up to ddf1434ff9bb08cfef3c93f23de6b83ec698aa27

- - - - -
f108a972 by Arnaud Spiwack at 2026-02-27T12:53:01-05:00
Make list comprehension completely non-linear

Fixes #25081

From the note:

The usefulness of list comprehension in conjunction with linear types is dubious.
After all, statements are made to be run many times, for instance in

```haskell
[u | y <- [0,1], stmts]
```

both `u` and `stmts` are going to be run several times.

In principle, though, there are some position in a monad comprehension
expression which could be considered linear. We could try and make it so that
these positions are considered linear by the typechecker, but in practice the
desugarer doesn't take enough care to ensure that these are indeed desugared to
linear sites. We tried in the past, and it turned out that we'd miss a
desugaring corner case (#25772).

Until there's a demand for this very specific improvement, let's instead be
conservative, and consider list comprehension to be completely non-linear.

- - - - -
ae799cab by Simon Jakobi at 2026-02-27T12:53:54-05:00
PmAltConSet: Use Data.Set instead of Data.Map

...to store `PmLit`s.

The Map was only used to map keys to themselves.
Changing the Map to a Set saves a Word of memory per entry.

Resolves #26756.

- - - - -
dcd7819c by Vladislav Zavialov at 2026-02-27T18:46:03-05:00
Drop HsTyLit in favor of HsLit (#26862, #25121)

This patch is a small step towards unification of HsExpr and HsType,
taking care of literals (HsLit) and type literals (HsTyLit).

Additionally, it improves error messages for unsupported type literals,
such as unboxed or fractional literals (test cases: T26862, T26862_th).

Changes to the AST:

* Use HsLit           where HsTyLit   was previously used
* Use HsChar          where HsCharTy  was previously used
* Use HsString        where HsStrTy   was previously used
* Use HsNatural (NEW) where HsNumTy   was previously used
* Use HsDouble  (NEW) to represent unsupported fractional type literals

Changes to logic:

* Parse unboxed and fractional type literals (to be rejected later)

* Drop the check for negative literals in the renamer (rnHsTyLit)
  in favor of checking in the type checker (tc_hs_lit_ty)

* Check for invalid type literals in TH (repTyLit) and report
  unrepresentable literals with ThUnsupportedTyLit

* Allow negative type literals in TH (numTyLit). This is fine as
  these will be taken care of at splice time (test case: T8306_th)

- - - - -
c927954f by Vladislav Zavialov at 2026-02-27T18:46:50-05:00
Increase test coverage of diagnostics

Add test cases for the previously untested diagnostics:
  [GHC-01239] PsErrIfInFunAppExpr
  [GHC-04807] PsErrProcInFunAppExpr
  [GHC-08195] PsErrInvalidRecordCon
  [GHC-16863] PsErrUnsupportedBoxedSumPat
  [GHC-18910] PsErrSemiColonsInCondCmd
  [GHC-24737] PsErrInvalidWhereBindInPatSynDecl
  [GHC-25037] PsErrCaseInFunAppExpr
  [GHC-25078] PsErrPrecedenceOutOfRange
  [GHC-28021] PsErrRecordSyntaxInPatSynDecl
  [GHC-35827] TcRnNonOverloadedSpecialisePragma
  [GHC-40845] PsErrUnpackDataCon
  [GHC-45106] PsErrInvalidInfixHole
  [GHC-50396] PsErrInvalidRuleActivationMarker
  [GHC-63930] MultiWayIfWithoutAlts
  [GHC-65536] PsErrNoSingleWhereBindInPatSynDecl
  [GHC-67630] PsErrMDoInFunAppExpr
  [GHC-70526] PsErrLetCmdInFunAppCmd
  [GHC-77808] PsErrDoCmdInFunAppCmd
  [GHC-86934] ClassPE
  [GHC-90355] PsErrLetInFunAppExpr
  [GHC-91745] CasesExprWithoutAlts
  [GHC-92971] PsErrCaseCmdInFunAppCmd
  [GHC-95644] PsErrBangPatWithoutSpace
  [GHC-97005] PsErrIfCmdInFunAppCmd

Remove unused error constructors:
  [GHC-44524] PsErrExpectedHyphen
  [GHC-91382] TcRnIllegalKindSignature

- - - - -
3a9470fd by Torsten Schmits at 2026-02-27T18:47:34-05:00
Avoid expensive computation for debug logging in `mergeDatabases` when log level is low

This computed and traversed a set intersection for every single
dependency unconditionally.

- - - - -
ea4c2cbd by Brandon Chinn at 2026-02-27T16:22:38-08:00
Implement QualifiedStrings (#26503)

See Note [Implementation of QualifiedStrings]

- - - - -
08bc245b by sheaf at 2026-03-01T11:11:54-05:00
Clean up join points, casts & ticks

This commit shores up the logic dealing with casts and ticks occurring
in between a join point binding and a jump.

Fixes #26642 #26929 #26693
Makes progress on #14610 #26157 #26422

Changes:

  - Remove 'GHC.Types.Tickish.TickishScoping' in favour of simpler
    predicates 'tickishHasNoScope'/'tickishHasSoftScope', as things were
    before commit 993975d3. This makes the code easier to read and
    document (fewer indirections).

  - Introduce 'canCollectArgsThroughTick' for consistent handling of
    ticks around PrimOps and other 'Id's that cannot be eta-reduced.
    See overhauled Note [Ticks and mandatory eta expansion].

  - New Note [JoinId vs TailCallInfo] in GHC.Core.SimpleOpt that explains
    robustness of JoinId vs fragility of TailCallInfo.

  - Allow casts/non-soft-scoped ticks to occur in between a join point
    binder and a jump, but only in Core Prep.
    See Note [Join points, casts, and ticks] and
    Note [Join points, casts, and ticks... in Core Prep]
    in GHC.Core.Opt.Simplify.Iteration.

    Also update Core Lint to account for this.
    See Note [Linting join points with casts or ticks] in GHC.Core.Lint.

  - Update 'GHC.Core.Utils.mergeCaseAlts' to avoid pushing a cast in
    between a join point binding and its jumps. This fixes #26642.
    See the new (MC5) and (MC6) in Note [Merge Nested Cases].

  - Update float out to properly handle source note ticks. They are now
    properly floated out instead of being discarded.
    This increases the number of ticks in certain tests with -g.

Test cases: T26642 and TrickyJoins.

Metric increase due to more source note ticks with -g:

-------------------------
Metric Increase:
    libdir
    size_hello_artifact
    size_hello_unicode
-------------------------

- - - - -
476c4cdf by Sean D. Gillespie at 2026-03-02T10:14:37-05:00
Add SIMD absolute value on x86 and LLVM

On x86, absolute value of 32 bits or less is implemented with
PABSB/PABSW/PABSD if SSSE3 is available. Otherwise, there is a fallback
for SSE2. For 64 bit integers it uses VPABSQ, required by AVX-512VL,
with fallbacks for SSE4.2 and SSE2.

There is no dedicated instruction for floating point absolute value on
x86, so it is simulated using bitwise AND.

Absolute value for signed integers and floats are implemented by the
"llvm.abs/llvm.fabs" standard library intrinsics. This implementation
uses MachOps constructors, unlike non-vector floating point absolute
value, which uses CallishMachOps.

- - - - -
709448c0 by Sean D. Gillespie at 2026-03-02T10:14:46-05:00
Add SIMD floating point square root

On x86, this is implemented with the SQRTPS and SQRTPD instructions. On
LLVM, it uses the sqrt library intrinstic.

- - - - -
0deadf66 by Sean D. Gillespie at 2026-03-02T10:14:47-05:00
Improve error message for SIMD on aarch64

When encountering vector literals on aarch64, previously it would
throw:

    <no location info>: error:
        panic! (the 'impossible' happened)
      GHC version 9.15.20251219:
            getRegister' (CmmLit:CmmVec):

Now it is more consistent with the other vector operations:

    <no location info>: error:
        sorry! (unimplemented feature or known bug)
      GHC version 9.15.20251219:
            SIMD operations on AArch64 currently require the LLVM backend

- - - - -
7d64031b by Vladislav Zavialov at 2026-03-03T11:09:28-05:00
Replace maybeAddSpace with spaceIfSingleQuote

Simplify pretty-printing of HsTypes by using spaceIfSingleQuote.
This allows us to drop the unwieldy lhsTypeHasLeadingPromotionQuote
helper function.

Follow-up to 178c1fd830c78377ef5d338406a41e1d8eb5f0da

- - - - -
598db847 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Correct `hIsReadable` and `hIsWritable` for duplex handles

This contribution implements CLC proposal #371. It changes `hIsReadable`
and `hIsWritable` such that they always throw a respective exception
when encountering a closed or semi-closed handle, not just in the case
of a file handle.

- - - - -
b90201e5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Document `SemiClosedHandle`

- - - - -
c9df72b5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Tell users what “semi-closed” means for duplex handles

- - - - -
a8aa1868 by Ilias Tsitsimpis at 2026-03-06T06:26:29-05:00
Fix determinism of linker arguments

The switch from Data.Map to UniqMap in 3b5be05ac29 introduced
non-determinism in the order of packages passed to the linker.

This resulted in non-reproducible builds where the DT_NEEDED entries in
dynamic libraries were ordered differently across builds.

Fix the regression by explicitly sorting the package list derived from
UniqMap.

Fixes #26838

- - - - -
9b64ad3a by Matthew Pickering at 2026-03-06T06:27:16-05:00
determinism: Use a deterministic renaming when writing bytecode files

Now when writing the bytecode file, a counter and substitution are used
to provide deterministic keys to local variables (rather than relying on
uniques). This change ensures that `.gbc` are produced
deterministically.

Fixes #26499

- - - - -
d29800e0 by Teo Camarasu at 2026-03-06T06:28:46-05:00
ghc-internal: delete Version hs-boot loop

Version has a Read instance which needs Unicode but part of the Unicode interface is the unicode version. This is easy to resolve. We simply don't re-export the version from the Unicode module.

Resolves #26940

- - - - -
ad25af90 by Sylvain Henry at 2026-03-06T06:30:33-05:00
Linker: implement support for COMMON symbols (#6107)

Add some support for COMMON symbols. We don't support common symbols
having different sizes where the larger one is allocated after the
smaller one. The linker will fail with an appropriate error message if
it happens.

- - - - -
3b59f158 by Cheng Shao at 2026-03-06T06:31:16-05:00
compiler: fix redundant import of GHC.Hs.Lit

This patch removes a redundant import of `GHC.Hs.Lit` which causes a
ghc build failure with validate flavours when bootstrapping from 9.14.
Fixes #26972.

- - - - -
148d36f3 by Cheng Shao at 2026-03-06T06:32:01-05:00
compiler: avoid unneeded traversals in GHC.Unit.State

Following !15591, this patch avoids unneeded traversals in
`reportCycles`/`reportUnusable` when log verbosity is below given
threshold. Also applies `logVerbAtLeast` when appropriate.

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

- - - - -
7e31367c by Cheng Shao at 2026-03-06T06:32:46-05:00
ghc-internal: fix redundant import in GHC.Internal.Event.Windows.ManagedThreadPool

This patch fixes redundant import in
`GHC.Internal.Event.Windows.ManagedThreadPool` that causes a
compilation error when building windows target with validate flavours
and bootstrapping from 9.14. Fixes #26976.

- - - - -
fc8b8e27 by sheaf at 2026-03-06T06:33:28-05:00
System.Info.fullCompilerVersion: add 'since' annot

Fixes #26973
- - - - -
c8238375 by Sylvain Henry at 2026-03-06T06:34:23-05:00
Hadrian: deprecate --bignum and automatically enable +native_bignum for JS

Deprecate --bignum=... to select the bignum backend. It's only used to
select the native backend, and this can be done with the +native_bignum
flavour transformer.

Additionally, we automatically enable +native_bignum for the JS target
because the GMP backend isn't supported.

- - - - -
a3ac7074 by Sylvain Henry at 2026-03-06T06:35:17-05:00
JS: fix putEnum/fromEnum (#24593)

Don't go through Word16 when serializing Enums.

- - - - -
0b36e96c by Andreas Klebinger at 2026-03-06T06:35:58-05:00
Docs: Document -fworker-wrapper-cbv default setting.

Fixes #26841

- - - - -
eca445e7 by mangoiv at 2026-03-07T05:02:36-05:00
drop deb9/10 from CI, add deb13

debian 9 and 10 are end of life, hence we drop them
from our CI, but we do add debian 13. Jobs that were
previously run on 9 and 10 run on 13, too, jobs that
were run on 10, are run on 11 now. Jobs that were
previously run on debian 12 are run on debian 13 now.
This MR also updates hadrian's bootstrap plans for that
reason.

Metric Decrease:
    T9872d

- - - - -
12f8b829 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Fix GHC.Internal.Prim haddock

Haddock used to parse Haskell source to generate documentation,
but switched to using interface files instead. This broke documentation
of the GHC.Internal.Prim module, since it's a wired-in interface that
didn't provide a document structure.

This patch adds the missing document structure and updates genprimopcode
to make the section headers and descriptions available.

fixes #26954

- - - - -
f87e5e57 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Remove obsolete --make-haskell-source from genprimopcode

Now that haddock uses the wired-in interface for GHC.Internal.Prim,
the generated Haskell source file is no longer needed. Remove the
--make-haskell-source code generator from genprimopcode and replace
the generated GHC/Internal/Prim.hs with a minimal static source file.

- - - - -
4a7ddc7b by Sylvain Henry at 2026-03-07T05:04:59-05:00
JS: fix linking of exposed but non-preload units (#24886)

Units exposed in the unit database but not explicitly passed on the
command-line were not considered by the JS linker. This isn't an issue
for cabal which passes every unit explicitly but it is an issue when
using GHC directly (cf T24886 test).

- - - - -
689aafcd by mangoiv at 2026-03-07T05:05:52-05:00
testsuite: double foundation timeout multiplier

The runtime timeout in the foundation test was regularly hit by code
generated by the wasm backend - we increase the timout since the high
runtime is expected on the wasm backend for this rather complex test.

Resolves #26938

- - - - -
a46a1bb1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: add myCapabilityExpr to GHC.Cmm.Utils

This commit adds `myCapabilityExpr` to `GHC.Cmm.Utils` which is
computed from `BaseReg`. It's convenient for codegen logic where one
needs to pass the current Capability's pointer.

- - - - -
4afc65b1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: lower tryPutMVar# into a ccall directly

This patch addresses an old TODO of `stg_tryPutMVarzh` by removing it
completely and making the compiler lower `tryPutMVar#` into a ccall to
`performTryPutMVar` directly, without landing into an intermediate C
or Cmm function. `performTryPutMVar` is promoted to a public RTS
function with default visibility, and the compiler lowering logic
takes into account the C ABI of `performTryPutMVar` and converts from
C Bool to primop's `Int#` result properly.

- - - - -
9e3d6a58 by Simon Hengel at 2026-03-09T04:51:15-04:00
Don't use #line in haddocks

This confuses the parser.  Haddock output is unaffected by this change.
(read: this still produces the same documentation)

- - - - -
f4e8fec2 by Wolfgang Jeltsch at 2026-03-09T04:52:01-04:00
Remove in-package dependencies on `GHC.Internal.System.IO`

This contribution eliminates all dependencies on
`GHC.Internal.System.IO` from within `ghc-internal`. It comprises the
following changes:

  * Make `GHC.Internal.Fingerprint` independent of I/O support
  * Tighten the dependencies of `GHC.Internal.Data.Version`
  * Tighten the dependencies of `GHC.Internal.TH.Monad`
  * Tighten the dependencies of `GHCi.Helpers`
  * Move some code that needs `System.IO` to `template-haskell`
  * Move the `GHC.ResponseFile` implementation into `base`
  * Move the `System.Exit` implementation into `base`
  * Move the `System.IO.OS` implementation into `base`

Metric Decrease:
    size_hello_artifact
    size_hello_artifact_gzip
    size_hello_unicode
    size_hello_unicode_gzip

- - - - -
91df4c82 by Sylvain Henry at 2026-03-09T04:53:20-04:00
T18832: fix Windows CI failure by dropping removeDirectoryRecursive

On Windows, open file handles prevent deletion. After killThread, the
closer thread may not have called hClose yet, causing removeDirectoryRecursive
to fail with "permission denied". The test harness cleans up the run
directory anyway, so the call is redundant.

- - - - -
d7fe9671 by Cheng Shao at 2026-03-09T04:54:04-04:00
compiler: fix redundant import in GHC.StgToJS.Object

This patch fixes a redundant import in GHC.StgToJS.Object that causes
a build failure when compiling head from 9.14 with validate flavours.
Fixes #26991.

- - - - -
0bfd29c3 by Cheng Shao at 2026-03-09T04:54:46-04:00
wasm: fix `Illegal foreign declaration` failure when ghci loads modules with JSFFI exports

This patch fixes a wasm ghci error when loading modules with JSFFI
exports; the `backendValidityOfCExport` check in `tcCheckFEType`
should only makes sense and should be performed when not checking the
JavaScript calling convention; otherwise, when the calling convention
is JavaScript, the codegen logic should be trusted to backends that
actually make use of it. Fixes #26998.

- - - - -
e659610c by Duncan Coutts at 2026-03-09T12:08:35-04:00
Apply NOINLINE pragmas to generated Typeable bindings

For context, see the existing Note [Grand plan for Typeable]
and the Note [NOINLINE on generated Typeable bindings] added in the
subsequent commit.

This is about reducing the number of exported top level names and
unfoldings, which reduces interface file sizes and reduces the number of
global/dynamic linker symbols.

Also accept the changed test output and metric decreases.

Tests that record the phase output for type checking or for simplifier
end up with different output: the generated bindings now have an
Inline [~] annotation, and many top level names are now local rather
than module-prefixed for export.

Also accept the numerous metric decreases in compile_time/bytes
allocated, and a few in compile_time/max_bytes_used.

There's also one instance of a decrease in runtime/max_bytes_used but
it's a ghci-way test and so presumably the reason is that it loads
smaller .hi files and/or links fewer symbols.

-------------------------
Metric Decrease:
    CoOpt_Singletons
    MultiLayerModulesTH_OneShot
    MultilineStringsPerf
    T10421
    T10547
    T12150
    T12227
    T12234
    T12425
    T13035
    T13056
    T13253
    T13253-spj
    T15304
    T15703
    T16875
    T17836b
    T17977b
    T18140
    T18223
    T18282
    T18304
    T18698a
    T18698b
    T18730
    T18923
    T20049
    T21839c
    T24471
    T24582
    T24984
    T3064
    T4029
    T5030
    T5642
    T5837
    T6048
    T9020
    T9198
    T9961
    TcPlugin_RewritePerf
    WWRec
    hard_hole_fits
    mhu-perf
-------------------------

- - - - -
67df5161 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Add documentation Note [NOINLINE on generated Typeable bindings]

and refer to it from the code and existing documentation.

- - - - -
c4ad6167 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Switch existing note to "named wrinkle" style, (GPT1)..(GPT7)

GPT = Grand plan for Typeable

- - - - -
dc84f8e2 by Cheng Shao at 2026-03-09T12:09:21-04:00
ci: only build deb13 for validate pipeline aarch64-linux jobs

This patch drops the redundant aarch64-linux deb12 job from validate pipelines
and only keeps deb13; it's still built in nightly/release pipelines. Closes #27004.

- - - - -
23a50772 by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00
chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad

Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to
GHC.Internal.TH.Monad and delete the Quote module.

Update submodule template-haskell-quasiquoter to use the merged
upstream version that imports from the correct module.

Co-authored-by: Cursor <cursoragent@cursor.com>

- - - - -
a2bb6fc3 by Simon Jakobi at 2026-03-10T14:12:23-04:00
Add regression test for #16122

- - - - -
604e1180 by Cheng Shao at 2026-03-11T15:00:42-04:00
hadrian: remove the broken bench flavour

This patch removes the bench flavour from hadrian which has been
broken for years and not used for actual benchmarking (for which
`perf`/`release` is used instead). Closes #26825.

- - - - -
c3e64915 by Simon Jakobi at 2026-03-11T15:01:31-04:00
Add regression test for #18186

The original TypeInType language extension is replaced with
DataKinds+PolyKinds for compatibility.

Closes #18186.

- - - - -
664996c7 by Andreas Klebinger at 2026-03-11T15:02:16-04:00
Bump nofib submodule.

We accrued a number of nofib fixes we want to have here.

- - - - -
517cf64e by Simon Jakobi at 2026-03-11T15:03:03-04:00
Add regression test for #15907

Closes #15907.

- - - - -
fff362cf by Simon Jakobi at 2026-03-11T15:03:49-04:00
Ensure T14272 is run in optasm way

Closes #16539.

- - - - -
ec81ec2c by Simon Jakobi at 2026-03-11T15:03:49-04:00
Add regression test for #24632

Closes #24632.

- - - - -
cefec47b by Simon Jakobi at 2026-03-11T15:03:50-04:00
Fix module name of T9675: T6975 -> T9675

- - - - -
d3690ae8 by Andreas Klebinger at 2026-03-11T15:04:31-04:00
User guide: Clarify phase control on INLINEABLE[foo] pragmas.

Fixes #26851

- - - - -
e7054934 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12694

Closes #12694.

- - - - -
4756d9f6 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #16275

Closes #16275.

- - - - -
34b7e2c1 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14908

Closes #14908.

- - - - -
4243db3d by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14151

Closes #14151.

- - - - -
0e9f1453 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12640

Closes #12640.

- - - - -
ae606c7f by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #15588

Closes #15588.

- - - - -
5a38ce4e by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #9445

Closes #9445.

- - - - -
d054b467 by Cheng Shao at 2026-03-11T15:05:59-04:00
compiler: implement string interning logic for BCONPtrFS

This patch adds a `FastStringEnv`-based cache of `MallocStrings`
requests to `Interp`, so that when we load bytecode with many
breakpoints that share the same module names & unit ids, we reuse the
allocated remote pointers instead of issuing duplicte `MallocStrings`
requests and bloating the C heap. Closes #26995.

- - - - -
b85a0293 by Simon Jakobi at 2026-03-11T15:06:41-04:00
Add perf test for #1216

Closes #1216.

- - - - -
cd7f7420 by Sylvain Henry at 2026-03-11T15:07:58-04:00
JS: check that tuple constructors are linked (#23709)

Test js-mk_tup was failing before because tuple constructors weren't
linked in. It's no longer an issue after the linker fixes.

- - - - -
d57f01a4 by Matthew Pickering at 2026-03-11T15:08:40-04:00
testsuite: Add test for foreign import prim with unboxed tuple return

This commit just adds a test that foreign import prim works with unboxed
sums.

- - - - -
23d111ce by Matthew Pickering at 2026-03-11T15:08:41-04:00
Return a valid pointer in advanceStackFrameLocationzh

When there is no next stack chunk, `advanceStackFrameLocationzh` used to
return NULL in the pointer-typed StackSnapshot# result slot.

Even though the caller treats that case as "no next frame", the result is
still materialized in a GC-visible pointer slot. If a GC observes the raw
NULL there, stack decoding can crash.

Fix this by ensuring the dead pointer slot contains a valid closure
pointer. Also make the optional result explicit by returning an unboxed
sum instead of a tuple with a separate tag.

Fixes #27009

- - - - -
4c58a3ae by Cheng Shao at 2026-03-11T15:09:22-04:00
hadrian: build profiled dynamic objects with -dynamic-too

This patch enables hadrian to build profiled dynamic objects with
`-dynamic-too`, addressing a build parallelism bottleneck in release
pipelines. Closes #27010.

- - - - -
870243e4 by Zubin Duggal at 2026-03-12T17:33:28+05:30
DmdAnal: Take stable unfoldings into account when determining argument demands

Previously, demand analysis only looked at the RHS to compute argument demands.
If the optimised RHS discarded uses of an argument that the stable unfolding
still needed, it would be incorrectly marked absent. Worker/wrapper would then
replace it with LitRubbish, and inlining the stable unfolding would use the
rubbish value, causing a segfault.

To fix, we introduce addUnfoldingDemands which analyses the stable unfolding
with dmdAnal and combines its DmdType with the RHS's via the new `maxDmdType`
which combines the demands of the stable unfolding with the rhs, so we can avoid
any situation where we give an absent demand to something which is still used
by the stable unfolding.

Fixes #26416.

- - - - -
669d09f9 by Cheng Shao at 2026-03-13T15:06:07-04:00
hadrian: remove redundant library/rts ways definitions from stock flavours

This patch removes redundant library/rts ways definitions from stock
flavours in hadrian; they can be replaced by applying appropriate
filters on `defaultFlavour`.

- - - - -
a27dc081 by Teo Camarasu at 2026-03-13T15:06:51-04:00
ghc-internal: move bits Weak of finalizer interface to base

We move parts of the Weak finalizer interface to `base` only the parts
that the RTS needs to know about are kept in `ghc-internal`.

This lets us then prune our imports somewhat and get rid of some SOURCE imports.

Resolves #26985

- - - - -
6eef855b by Sylvain Henry at 2026-03-13T15:08:18-04:00
Stg/Unarise: constant-folding during unarisation (#25650)

When building an unboxed sum from a literal argument, mkUbxSum
previously emitted a runtime cast via `case primop [lit] of var -> ...`.
This wrapper prevented GHC from recognising the result as a static
StgRhsCon, causing top-level closures to be allocated as thunks instead
of being statically allocated.

Fix: try to perform the numeric literal cast at compile time using
mkLitNumberWrap (wrapping semantics). If successful, return the cast
literal directly with an identity wrapper (no case expression). The
runtime cast path is kept as fallback for non-literal arguments.

Test: codeGen/should_compile/T25650

- - - - -
905f8723 by Simon Jakobi at 2026-03-13T15:09:09-04:00
Add regression test for #2057

Test that GHC stops after an interface-file error instead of
continuing into the linker.

The test constructs a stale package dependency on purpose. `pkgB` is compiled
against one version of package `A`, then the same unit id is replaced by an
incompatible build of `A`. When `Main` imports `B`, GHC has to read `B.hi`,
finds an unfolding that still mentions the old `A`, and should fail while
loading interfaces.

Closes #2057.

Assisted-by: Codex

- - - - -
a13245a9 by Sylvain Henry at 2026-03-13T15:10:06-04:00
JS: fix recompilation avoidance (#23013)

- we were checking the mtime of the *.jsexe directory, not of a file
- we were not computing the PkgsLoaded at all

- - - - -
07442653 by Cheng Shao at 2026-03-13T15:10:51-04:00
hadrian: bump index state & bootstrap plans

This patch bumps hadrian index state & bootstrap plans:

- The updated index state allows bootstrapping from 9.14 without cabal
  allow-newer hacks
- The updated bootstrap plans all contain shake-0.19.9 containing
  important bugfix, allowing a subsequent patch to bump shake bound to
  ensure the bugfix is included
- ghc 9.14.1 bootstrap plan is added

- - - - -
fdc1dbad by Cheng Shao at 2026-03-13T15:10:51-04:00
ci: add ghc 9.14.1 to bootstrap matrix

This patch adds ghc 9.14.1 to bootstrap matrix, so that we test
bootstrapping from ghc 9.14.1.

- - - - -
91916079 by Sylvain Henry at 2026-03-13T15:11:43-04:00
T17912: wait for opener thread to block before killing it (#24739)

Instead of a fixed 1000ms delay, poll threadStatus until the opener
thread is in BlockedOnForeignCall, ensuring killThread only fires once
the thread is provably inside the blocking open() syscall. This prevents
the test from accidentally passing on Windows due to scheduling races.

- - - - -
baa4ebb4 by Cheng Shao at 2026-03-13T15:12:26-04:00
template-haskell: fix redundant import in Language.Haskell.TH.Quote

This patch fixes a redundant import in `Language.Haskell.TH.Quote`
that causes a ghc build failure when bootstrapping from 9.14 with
validate flavours. Fixes #27014.

- - - - -
02e68a86 by Brandon Simmons at 2026-03-13T15:13:19-04:00
Add a cumulative gc_sync_elapsed_ns counter to GHC.Internal.Stats

This makes it possible to get an accurate view of time spent in sync
phase when using prometheus-style sampling. Previously this was only
available for the most recent GC.

This intentionally leaves GHC.Stats API unchanged since it is marked as
deprecated, and API changes there require CLC approval.

Fixes #26944

- - - - -
a18fa3c1 by Cheng Shao at 2026-03-14T05:12:14-04:00
configure: make $LLVMAS default to $CC when $CcLlvmBackend is YES

This patch changes the $LLVMAS detection logic in configure so that
when it's not manually specified by the user, it defaults to $CC if
$CcLlvmBackend is YES. It's a more sensible default than auto-detected
clang from the environment, especially when cross-compiling, $CC as
the cross target's LLVM assembler is more compatible with the use case
than the system-wide clang. Fixes #26769.

- - - - -
3774086e by Matthew Pickering at 2026-03-14T05:13:00-04:00
exceptions: annotate onException continuation with WhileHandling

Before this patch, an exception thrown in the `onException` handler
would loose track of where the original exception was thrown.

```
import Control.Exception

main :: IO ()
main = failingAction `onException` failingCleanup
  where
    failingAction = throwIO (ErrorCall "outer failure")
    failingCleanup = throwIO (ErrorCall "cleanup failure")
```

would report

```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:

cleanup failure

HasCallStack backtrace:
  throwIO, called at T28399.hs:<line>:<column> in <package-id>:Main
```

notice that the "outer failure" exception is not present in the error
message.

With this patch, any exception thrown is in the handler is annotated
with WhileHandling. The resulting message looks like

```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:

cleanup failure

While handling outer failure

HasCallStack backtrace:
  throwIO, called at T28399.hs:7:22 in main:Main
```

CLC Proposal: https://github.com/haskell/core-libraries-committee/issues/397

Fixes #26759

- - - - -
63ae8eb3 by Andreas Klebinger at 2026-03-14T05:13:43-04:00
Fix missing profiling header for origin_thunk frame.

Fixes #27007

- - - - -
213d2c0e by Cheng Shao at 2026-03-14T05:14:28-04:00
ci: fix ci-images revision

The current ci-images revision was a commit on the WIP branch of
https://gitlab.haskell.org/ghc/ci-images/-/merge_requests/183, and
it's not on the current ci-images master branch. This patch fixes the
image revision to use the current tip of ci-images master.

- - - - -
fc2b083f by Andreas Klebinger at 2026-03-14T05:15:14-04:00
Revert "hadrian/build-cabal: Better respect and utilize -j"

This reverts commit eab3dbba79650e6046efca79133b4c0a5257613d.

While it's neat this currently isn't well supported on all platforms.

It's time will come, but for now I'm reverting this to avoid issues for
users on slightly unconvential platforms.

This will be tracked at #26977.

- - - - -
12a706cf by Cheng Shao at 2026-03-14T16:37:54-04:00
base: fix redundant imports in GHC.Internal.Weak.Finalize

This patch fixes redundant imports in GHC.Internal.Weak.Finalize that
causes a regression in bootstrapping head from 9.14 with validate
flavours. Fixes #27026.

- - - - -
b5d39cad by Matthew Pickering at 2026-03-14T16:38:37-04:00
Use explicit syntax rather than pure

- - - - -
43638643 by Andreas Klebinger at 2026-03-15T18:15:48-04:00
Configure: Fix check for --target support in stage0 CC

The check FP_PROG_CC_LINKER_TARGET used $CC unconditionally to check for
--target support. However this fails for the stage0 config where the C
compiler used is not $CC but $CC_STAGE0.

Since we already pass the compiler under test into the macro I simply
changed it to use that instead.

Fixes #26999

- - - - -
18fd0df6 by Simon Hengel at 2026-03-15T18:16:33-04:00
Fix typo in recursive_do.rst
- - - - -
86bd9bfc by fendor at 2026-03-17T23:46:09-04:00
Introduce `-fimport-loaded-targets` GHCi flag

This new flag automatically adds all loaded targets to the GHCi session
by adding an `InteractiveImport` for the loaded targets.

By default, this flag is disabled, as it potentially increases memory-usage.

This interacts with the flag `-fno-load-initial-targets` as follows:

* If no module is loaded, no module is added as an interactive import.
* If a reload loads up to a module, all loaded modules are added as
  interactive imports.
* Unloading modules removes them from the interactive context.

Fixes #26866 by rendering the use of a `-ghci-script` to achieve the
same thing redundant.

- - - - -
e3d4c1bb by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Remove GHC.Internal.Data.Eq

It served no purpose other than being a re-export.

- - - - -
6f4f6cf0 by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Refine GHC.Internal.Base imports

Removed re-exports from GHC.Internal.Base. This reveals some modules
that don't actually use anything *defined* in GHC.Internal.Base, and
that can be pushed down a little in the import graph.

Replaced most imports of GHC.Internal.Base with non-wildcard imports
from modules where the identifiers are actually defined.

Part of #26834

Metric Decrease:
    T5321FD

- - - - -
7fb51f54 by mangoiv at 2026-03-17T23:48:00-04:00
ci: clone, don't copy when creating the cabal cache

Also removed WINDOWS_HOST variable detected via uname - we now just
check whether the CI job has windows in its name. This works because we
only ever care about it if the respective job is not a cross job. We
also statically detect darwin cross jobs in the same way. We only ever have
darwin -> darwin cross jobs so this is enough to detect the host
reliably.

- - - - -
f8817879 by mangoiv at 2026-03-17T23:48:44-04:00
ci: mark size_hello_artifact fragile on darwin x86

The size of the x86_64 hello artifact is not stable which results in flaky testruns.

Resolves #26814

- - - - -
e34cb6da by Adam Gundry at 2026-03-20T12:20:00-04:00
ghci: Mention active language edition in startup banner

Per GHC proposal 632, this makes the GHCi startup banner include
the active language edition, plus an indication of whether this
was the default (as opposed to being explicitly selected via an
option such as `-XGHC2024`). For example:

```
$ ghci
GHCi, version 9.14.1: https://www.haskell.org/ghc/  :? for help
Using default language edition: GHC2024
ghci>
```

Fixes #26037.

- - - - -
52c3e6ba by sheaf at 2026-03-20T12:21:09-04:00
Improve incomplete record selector warnings

This commit stops GHC from emitting spurious incomplete record selector
warnings for bare selectors/projections such as .fld

There are two places we currently emit incomplete record selector
warnings:

  1. In the desugarer, when we see a record selector or an occurrence
     of 'getField'. Here, we can use pattern matching information to
     ensure we don't give false positives.
  2. In the typechecker, which might sometimes give false positives but
     can emit warnings in cases that the pattern match checker would
     otherwise miss.

This is explained in Note [Detecting incomplete record selectors]
in GHC.HsToCore.Pmc.

Now, we obviously don't want to emit the same error twice, and generally
we prefer (1), as those messages contain fewer false positives. So we
suppress (2) when we are sure we are going to emit (1); the logic for
doing so is in GHC.Tc.Instance.Class.warnIncompleteRecSel,
and works by looking at the CtOrigin.

Now, the issue was that this logic handled explicit record selectors as
well as overloaded record field selectors such as "x.r" (which turns
into a simple GetFieldOrigin CtOrigin), but it didn't properly handle
record projectors like ".fld" or ".fld1.fld2" (which result in other
CtOrigins such as 'RecordFieldProjectionOrigin').

To solve this problem, we re-use the 'isHasFieldOrigin' introduced in
fbdc623a (slightly adjusted).

On the way, we also had to update the desugarer with special handling
for the 'ExpandedThingTc' case in 'ds_app', to make sure that
'ds_app_var' sees all the type arguments to 'getField' in order for it
to indeed emit warnings like in (1).

Fixes #26686

- - - - -
309d7e87 by Cheng Shao at 2026-03-20T12:21:53-04:00
rts: opportunistically grow the MutableByteArray# in-place in resizeMutableByteArray#

Following !15234, this patch improves `resizeMutableByteArray#` memory
efficiency by growing the `MutableByteArray#` in-place if possible,
addressing an old todo comment here. Also adds a new test case
`resizeMutableByteArrayInPlace` that stresses this behavior.

- - - - -
7d4ef162 by Matthew Craven at 2026-03-20T12:22:47-04:00
Change representation of floating point literals

This commit changes the representation of floating point literals
throughough the compiler, in particular in Core and Cmm.
The Rational type is deficient for this purpose, dealing poorly
with NaN, +/-Infinity, and negative zero. Instead, the new module
GHC.Types.Literal.Floating uses the host Float/Double type to represent
NaNs, infinities and negative zero. It also contains a Rational
constructor, for the benefit of -fexcess-precision.

Other changes:

  - Remove Note [negative zero] and related code
    This also removes the restrictions on constant-folding of division
    by zero, and should make any problems with NaN/Infinity more obvious.

  - Use -0.0 as the additive identity for Core constant folding rules
    for floating-point addition, fixing #21227.

  - Manual worker-wrapper for GHC.Float.rationalToDouble. This is
    intended to prevent the compiler's WW on this function from
    interfering with constant-folding. This change means that we now
    avoid allocating a box for the result of a 'realToFrac' call in
    T10359.

  - Combine floatDecodeOp and doubleDecodeOp.
    This change also fixes a bug in doubleDecodeOp wherein it
    would incorrectly produce an Int# instead of an Int64#
    literal for the mantissa component with 64-bit targets.

  - Use Float/Double for assembly immediates, and update the X86 and
    PowerPC backends to properly handle special values such as NaN and
    infinity.

  - Allow 'rational_to' to handle zero denominators, fixing a
    TODO in GHC.Core.Opt.ConstantFold.

Fixes #8364 #9811 #18897 #21227
Progress towards #26919

Metric Decrease:
    T10359

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

-------------------------
Metric Decrease:
    T1969
    T5321FD
-------------------------

- - - - -
80e2dd4f by Zubin Duggal at 2026-03-20T12:23:33-04:00
compiler/ffi: Collapse void pointer chains in capi wrappers

New gcc/clang treat -Wincompatible-pointer-types as an error by
default. Since C only allows implicit conversion from void*, not void**,
capi wrappers for functions taking e.g. abstract** would fail to compile
when the Haskell type Ptr (Ptr Abstract) was naively translated to void**.

Collapse nested void pointers to a single void* when the pointee type
has no known C representation.

Fixes #26852

- - - - -
1c50bd7b by Luite Stegeman at 2026-03-20T12:24:37-04:00
Move some functions related to pointer tagging to a separate module

- - - - -
bfd7aafd by Luite Stegeman at 2026-03-20T12:24:37-04:00
Branchless unpacking for enumeration types

Change unpacking for enumeration types to go to Word8#/Word16#/Word#
directly instead of going through an intermediate unboxed sum. This
allows us to do a branchless conversion using DataToTag and TagToEnum.

Fixes #26970

- - - - -
72b20fc0 by Luite Stegeman at 2026-03-20T12:25:30-04:00
bytecode: Carefully SLIDE off the end of a stack chunk

The SLIDE bytecode instruction was not checking for stack chunk
boundaries and could corrupt the stack underflow frame, leading
to crashes.

We add a check to use safe writes if we cross the chunk boundary
and also handle stack underflow if Sp is advanced past the underflow
frame.

fix #27001

- - - - -
2e22b43c by Cheng Shao at 2026-03-20T12:26:14-04:00
ghci: serialize BCOByteArray buffer directly when possible

This patch changes the `Binary` instances of `BCOByteArray` to
directly serialize the underlying buffer when possible, while also
taking into account the issue of host-dependent `Word` width. See
added comments and amended `Note [BCOByteArray serialization]` for
detailed explanation. Closes #27020.

- - - - -
89d9ba37 by Sylvain Henry at 2026-03-20T12:27:34-04:00
JS: replace BigInt with Number arithmetic for 32/64-bit quot/rem (#23597)

Replace BigInt-based implementations of quotWord32, remWord32,
quotRemWord32, quotRem2Word32, quotWord64, remWord64, quotInt64, and
remInt64 with pure Number (double/integer) arithmetic to avoid the
overhead of BigInt promotion.

- - - - -
ae4ddd60 by Sylvain Henry at 2026-03-20T12:28:28-04:00
Core: add constant-folding rules for Addr# eq/ne (#18032)

- - - - -
3e767f98 by Matthew Pickering at 2026-03-20T12:29:11-04:00
Use OsPath rather than FilePath in Downsweep cache

This gets us one step closure to uniformly using `OsPath` in the
compiler.

- - - - -
2c57de29 by Cheng Shao at 2026-03-20T12:29:55-04:00
hadrian: fix ghc-in-ghci flavour stage0 shared libraries

This patch fixes missing stage0 shared libraries in hadrian
ghc-in-ghci flavour, which was accidentally dropped in
669d09f950a6e88b903d9fd8a7571531774d4d5d and resulted in a regression
in HLS support on linux/macos. Fixes #27057.

- - - - -
5b1be555 by Sylvain Henry at 2026-03-20T12:30:48-04:00
JS: install rts/Types.h header file (#27033)

It was an omission, making HsFFI.h not usable with GHC using the JS
backend.

- - - - -
b883f08f by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: don't compile RTS with -Winline

This patch removes `-Winline` from cflags when compiling the RTS,
given that:

1. It generates a huge pile of spam and hurts developer experience
2. Whether inlining happens is highly dependent on toolchains,
   flavours, etc, and it's not really an issue to fix if inlining
   doesn't happen; it's a hint to the C compiler anyway.

Fixes #27060.

- - - - -
333387d6 by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: compile libffi-clib with -Wno-deprecated-declarations

This patch adds `-Wno-deprecated-declarations` to cflags of
`libffi-clib`, given that it produces noise at compile-time that
aren't really our issue to fix anyway, it's from vendored libffi
source code.

- - - - -
67c47771 by Rodrigo Mesquita at 2026-03-20T12:32:17-04:00
Expose decodeStackWithIpe from ghc-experimental

This decoding is useful to the debugger and it wasn't originally
exported as an oversight.

- - - - -
18513365 by Matthew Pickering at 2026-03-21T04:43:26-04:00
Add support for custom external interpreter commands

It can be useful for GHC API clients to implement their own external
interpreter commands.

For example, the debugger may want an efficient way to inspect the
stacks of the running threads in the external interpreter.

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

- - - - -
2e3a2805 by mangoiv at 2026-03-21T04:44:10-04:00
ci: drop ubuntu 18 and 20

Ubuntu 18 EOL: May 2023
Ubuntu 20 EOL: May 2025

We should probably not make another major release supporting these platforms.

Also updates the generator script.

Resolves #25876

- - - - -
de54e264 by Cheng Shao at 2026-03-21T17:52:08+01:00
rts: fix -Wcompare-distinct-pointer-types errors

This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS
which should have been caught by the `validate` flavour but was
warnings in CI due to the recent `+werror` regression.

- - - - -
b9bd73de by Cheng Shao at 2026-03-21T17:52:08+01:00
ghc-internal: fix unused imports

This commit fixes unused imports in `ghc-internal` which should have
been caught by the `validate` flavour but was warnings in CI due to
the recent `+werror` regression. Fixes #26987 #27059.

- - - - -
da946a16 by Cheng Shao at 2026-03-21T17:03:51+00:00
ghci: fix unused imports

This commit fixes unused imports in `ghci` which should have been
caught by the `validate` flavour but was warnings in CI due to the
recent `+werror` regression. Fixes #26987 #27059.

- - - - -
955b1cf8 by Cheng Shao at 2026-03-21T17:03:51+00:00
compiler: fix unused imports in GHC.Tc.Types.Origin

This commit fixes unused imports in `GHC.Tc.Types.Origin` which should
have been caught by the `validate` flavour but was warnings in CI due
to the recent `+werror` regression. Fixes #27059.

- - - - -
3b1aeb50 by Cheng Shao at 2026-03-21T17:03:51+00:00
hadrian: fix missing +werror in validate flavour

This patch fixes missing `+werror` in validate flavour, which was an
oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066.

- - - - -
44f118f0 by Cheng Shao at 2026-03-22T04:54:01-04:00
ci: bump CACHE_REV and add the missing reminder

This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI
errors due to stale cabal cache on some runners, and also adds a
reminder to remind future maintainers. Fixes #27075.

- - - - -
2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
Add 128-bit SIMD support to AArch64 NCG

Changes:

- Add `Format` field to vector-capable instructions.
  These instructions will emit `vN.4s` (for example) as a operand.
- Additional constructors for `Operand`:
  `OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example).
  `OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example).
- Integer quot/rem are implemented in C, like x86.

Closes #26536

Metric Increase:
    T3294

- - - - -
5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
AArch64 NCG: Improve code generation for floating-point and vector constants

Some floating-point constants can be directly encoded using the FMOV instruction.
Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI.

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

Closes #13729.

- - - - -
aa5dfe67 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Check that shift values are valid

In GHC's codebase in non-DEBUG builds we silently substitute shiftL/R
with unsafeShiftL/R for performance reasons. However we were not
checking that the shift value was valid for unsafeShiftL/R, leading to
wrong computations, but only in non-DEBUG builds.

This patch adds the necessary checks and reports an error when a wrong
shift value is passed.

- - - - -
c8a7b588 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Implement basic value range analysis (#25718)

Perform basic value range analysis to try to determine at compile time
the result of the application of some comparison primops (ltWord#, etc.).

This subsumes the built-in rewrite rules used previously to check if one
of the comparison argument was a bound (e.g. (x :: Word8) <= 255 is
always True). Our analysis is more powerful and handles type
conversions: e.g. word8ToWord x <= 255 is now detected as always True too.

We also use value range analysis to filter unreachable alternatives in
case-expressions. To support this, we had to allow case-expressions for
primitive types to not have a DEFAULT alternative (as was assumed before
and checked in Core lint).

- - - - -
a5ec467e by ARATA Mizuki at 2026-03-26T03:49:49-04:00
rts: Align stack to 64-byte boundary in StgRun on x86

When LLVM spills AVX/AVX-512 vector registers to the stack, it requires
32-byte (__m256) or 64-byte (__m512) alignment. If the stack is not
sufficiently aligned, LLVM inserts a realignment prologue that reserves
%rbp as a frame pointer, conflicting with GHC's use of %rbp as an STG
callee-saved register and breaking the tail-call-based calling convention.

Previously, GHC worked around this by lying to LLVM about the stack
alignment and rewriting aligned vector loads/stores (VMOVDQA, VMOVAPS)
to unaligned ones (VMOVDQU, VMOVUPS) in the LLVM Mangler. This had two
problems:

- It did not extend to AVX-512, which requires 64-byte alignment. (#26595)
- When Haskell calls a C function that takes __m256/__m512 arguments on
  the stack, the callee requires genuine alignment, which could cause a
  segfault. (#26822)

This patch genuinely aligns the stack to 64 bytes in StgRun by saving
the original stack pointer before alignment and restoring it in
StgReturn. We now unconditionally advertise 64-byte stack alignment to
LLVM for all x86 targets, making rewriteAVX in the LLVM Mangler
unnecessary. STG_RUN_STACK_FRAME_SIZE is increased from 48 to 56 bytes
on non-Windows x86-64 to store the saved stack pointer.

Closes #26595 and #26822

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- - - - -
661da815 by Teo Camarasu at 2026-03-26T03:50:33-04:00
ghc-internal: Float Generics to near top of module graph

We remove GHC.Internal.Generics from the critical path of the
`ghc-internal` module graph. GHC.Internal.Generics used to be in the
middle of the module graph, but now it is nearer the top (built later).
This change thins out the module graph and allows us to get rid of the
ByteOrder hs-boot file.

We implement this by moving Generics instances from the module where the
datatype is defined to the GHC.Internal.Generics module. This trades off
increasing the compiled size of GHC.Internal.Generics with reducing the
dependency footprint of datatype modules.

Not all instances are moved to GHC.Internal.Generics. For instance,
`GHC.Internal.Control.Monad.Fix` keeps its instance as it is one of the
very last modules compiled in `ghc-internal` and so inverting the
relationship here would risk adding GHC.Internal.Generics back onto the
critical path.
We also don't change modules that are re-exported from the `template-haskell` or `ghc-heap`.
This is done to make it easy to eventually move `Generics` to `base`
once something like #26657 is implemented.

Resolves #26930

Metric Decrease:
    T21839c

- - - - -
45428f88 by sheaf at 2026-03-26T03:51:31-04:00
Avoid infinite loop in deep subsumption

This commit ensures we only unify after we recur in the deep subsumption
code in the FunTy vs non-FunTy case of GHC.Tc.Utils.Unify.tc_sub_type_deep,
to avoid falling into an infinite loop.

See the new Wrinkle [Avoiding a loop in tc_sub_type_deep] in
Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.

Fixes #26823

Co-authored-by: simonpj <simon.peytonjones@gmail.com>

- - - - -
2823b039 by Ian Duncan at 2026-03-26T03:52:21-04:00
AArch64: fix MOVK regUsageOfInstr to mark dst as both read and written

MOVK (move with keep) modifies only a 16-bit slice of the destination
register, so the destination is both read and written. The register
allocator must know this to avoid clobbering live values. Update
regUsageOfInstr to list the destination in both src and dst sets.

No regression test: triggering the misallocation requires specific
register pressure around a MOVK sequence, which is difficult to
reliably provoke from Haskell source.

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

Closes #12002.

- - - - -
c8f9df2d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12046

Closes #12046.

Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>

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

Closes #13180.

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

Closes #11141.

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

Closes #11505.

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

Closes #13820.

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

Closes #10381.

- - - - -
5ebcfb57 by Benjamin Maurer at 2026-03-26T03:54:02-04:00
Generate assembly on x86 for word2float (#22252)

We used to emit C function call for MO_UF_Conv primitive.
Now emits direct assembly instead.

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

- - - - -
5b550754 by Matthew Pickering at 2026-03-26T03:54:51-04:00
rts: forward clone-stack messages after TSO migration

MSG_CLONE_STACK assumed that the target TSO was still owned by the
capability that received the message. This is not always true: the TSO
can migrate before the inbox entry is handled.

When that happened, handleCloneStackMessage could clone a live stack from
the wrong capability and use the wrong capability for allocation and
performTryPutMVar, leading to stack sanity failures such as
checkStackFrame: weird activation record found on stack.

Fix this by passing the current capability into
handleCloneStackMessage, rechecking msg->tso->cap at handling time, and
forwarding the message if the TSO has migrated. Once ownership matches,
use the executing capability consistently for cloneStack, rts_apply, and
performTryPutMVar.

Fixes #27008

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

- - - - -
a7f40fd9 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: add a release tracking ticket

Brings the information in the release tracking ticket up to date with
https://gitlab.haskell.org/ghc/ghc-hq/-/blob/main/release-management.mkd

Resolves #26691

- - - - -
161d3285 by Teo Camarasu at 2026-03-26T03:56:18-04:00
Revert "Set default eventlog-flush-interval to 5s"

Flushing the eventlog forces a synchronisation of all the capabilities
and there was a worry that this might lead to a performance cost for
some highly parallel workloads.

This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2.

- - - - -
36eed985 by Cheng Shao at 2026-03-26T03:57:03-04:00
ghc-boot: move GHC.Data.SmallArray to ghc-boot

This commit moves `GHC.Data.SmallArray` from the `ghc` library to
`ghc-boot`, so that it can be used by `ghci` as well:

- The `Binary` (from `ghc`) instance of `SmallArray` is moved to
  `GHC.Utils.Binary`
- Util functions `replicateSmallArrayIO`, `mapSmallArrayIO`,
  `mapSmallArrayM_`, `imapSmallArrayM_` , `smallArrayFromList` and
  `smallArrayToList` are added
- The `Show` instance is added
- The `Binary` (from `binary`) instance is added

- - - - -
fdf828ae by Cheng Shao at 2026-03-26T03:57:03-04:00
compiler: use `Binary` instance of `BCOByteArray` for bytecode objects

This commit defines `Binary` (from `compiler`) instance of
`BCOByteArray` which serializes the underlying buffer directly, and
uses it directly in bytecode object serialization. Previously we reuse
the `Binary` (from `binary`) instance, and this change allows us to
avoid double-copying via an intermediate `ByteString` when using
`put`/`get` in `binnary`. Also see added comment for explanation.

- - - - -
3bf62d0a by Cheng Shao at 2026-03-26T03:57:03-04:00
ghci: use SmallArray directly in ResolvedBCO

This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when
applicable, making the memory representation more compact and reducing
marshaling overhead. Closes #27058.

- - - - -
3d6492ce by Wen Kokke at 2026-03-26T03:57:53-04:00
Fix race condition between flushEventLog and start/endEventLogging.

This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving:

- `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`.
- `flushEventLog` flushes some events to `event_log_writer`.
- `startEventLogging` writes the eventlog header to `event_log_writer`.

This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header.

This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as:

```c
void flushEventLog(Capability **cap USED_IF_THREADS)
{
  ACQUIRE_LOCK(&state_change_mutex);
  flushEventLog_(cap);
  RELEASE_LOCK(&state_change_mutex);
}
```

The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable.

I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours.

- - - - -
7b9a75f0 by Phil Hazelden at 2026-03-26T03:58:37-04:00
Fix build with werror on glibc 2.43.

We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same
values as defined in glibc prior to 2.43. But in 2.43, glibc changes
them to new values, which means we get a warning when redefining them.
By `#undef`ing them first, we no longer get a warning.

Closes #27076.

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

- - - - -
404b71c1 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Fix assert in Interpreter.c

If we skip exactly the number of words on the stack we end up on
the first word in the next chunk.

- - - - -
a85bd503 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Support arbitrary size unboxed tuples in bytecode

This stores the size (number of words on the stack) of the next
expected tuple in the TSO, ctoi_spill_size field, eliminating
the need of stg_ctoi_tN frames for each size.

Note: On 32 bit platform there is still a bytecode tuple size
limit of 255 words on the stack.

Fixes #26946

- - - - -
e2209031 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Add specialized frames for small tuples

Small tuples are now returned more efficiently to the interpreter.
They use one less word of stack space and don't need manipulation
of the TSO anymore.

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

Fixes #24932

- - - - -
66e5e324 by Vladislav Zavialov at 2026-03-27T04:42:25-04:00
Extend HsExpr with the StarIsType syntax (#26587, #26967)

This patch allows kinds of the form `k -> *` and `* -> k` to occur in
expression syntax, i.e. to be used as required type arguments.

For example:

	{-# LANGUAGE RequiredTypeArguments, StarIsType #-}
	x1 = f (* -> * -> *)
	x2 = f (forall k. k -> *)
	x3 = f ((* -> *) -> Constraint)

Summary of the changes:

* Introduce the HsStar constructor of HsExpr and its extension field XStar.
  It is analogous to HsStarTy in HsType.

* Refactor HsStarTy to store the unicode flag as TokStar, defined as
    type TokStar = EpUniToken "*" "★"  -- similar to TokForall, TokRArrow, etc.
  The token is stored in the extension field and replaces the Bool field.

* Extend the `infixexp2` nonterminal to parse `*` as a direct argument of `->`.
  This is more limited than the full StarIsType syntax, but has the nice
  property of not conflicting with the multiplication operator `a * b`.

Test case: T26967 T26967_tyop

- - - - -
f8de456f by Sylvain Henry at 2026-03-27T04:43:22-04:00
STM: don't create a transaction in the rhs of catchRetry# (#26028)

We don't need to create a transaction for the rhs of (catchRetry#)
because contrary to the lhs we don't need to abort it on retry. Moreover
it is particularly harmful if we have code such as (#26028):

  let cN = readTVar vN >> retry
      tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
  atomically tree

Because it will stack transactions for the rhss and the read-sets of all
the transactions will be iteratively merged in O(n^2) after the
execution of the most nested retry.

This is the second attempt at implementing this. The first attempt
triggered segfaults (#26291) and has been reverted.

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

- - - - -
fcf092dd by Luite Stegeman at 2026-03-27T04:44:17-04:00
Windows: remove StgAsyncIOResult and fix crash/leaks

In stg_block_async{_void}, a stack slot was reserved for
an StgAsyncIOResult. This slot would be filled by the IO
manager upon completion of the async call.

However, if the blocked thread was interrupted by an async
exception, we would end up in an invalid state:

 - If the blocked computation was never re-entered, the
   StgAsyncIOResult would never be freed.
 - If the blocked computation was re-entered, the thread would
   find an unitialized stack slot for the StgAsyncIOResult,
   leading to a crash reading its fields, or freeing the pointer.

We fix this by removing the StgAsyncIOResult altogether and writing
the result directly to the stack.

Fixes #26341

- - - - -
05094993 by Luite Stegeman at 2026-03-27T04:45:12-04:00
Don't refine DEFAULT alt for unary typeclasses

A non-DEFAULT data alt for a unary typeclass dictionary would
interfere with Unary Class Magic, leading to segfaults.

fixes #27071

- - - - -
4ee260cf by sheaf at 2026-03-27T04:46:06-04:00
Fix several oversights in hsExprType

This commit fixes several oversights in GHC.Hs.Syn.Type.hsExprType:

  - The 'RecordCon' case was returning the type of the constructor,
    instead of the constructor application. This is fixed by using
    'splitFunTys'.
  - The 'ExplicitTuple' case failed to take into account tuple sections,
    and was also incorrectly handling 1-tuples (e.g. 'Solo') which can
    be constructed using Template Haskell.
  - The 'NegApp' case was returning the type of the negation operator,
    again failing to apply it to the argument. Fixed by using
    'funResultTy'.
  - The 'HsProc' case was computing the result type of the arrow proc
    block, without taking into account the argument type. Fix that by
    adding a new field to 'CmdTopTc' that stores the arrow type, so that
    we can construct the correct result type `arr a b` for
    `proc (pat :: a) -> (cmd :: b)`.
  - The 'ArithSeq' and 'NegApp' cases were failing to take into account
    the result 'HsWrapper', which could e.g. silently drop casts.
    This is fixed by introducing 'syntaxExpr_wrappedFunResTy' which, on
    top of taking the result type, applies the result 'HsWrapper'.

These fixes are validated by the new GHC API test T26910.

Fixes #26910

- - - - -
e97232ce by Hai at 2026-03-27T04:47:04-04:00
Parser.y: avoid looking at token with QualifiedDo

This changes the behavior of 'hintQualifiedDo' so that the supplied
token is not inspected when the QualifiedDo language extension bit is
set.

- - - - -
9831385b by Vladislav Zavialov at 2026-03-27T17:22:30-04:00
Infix holes in types (#11107)

This patch introduces several improvements that follow naturally from
refactoring HsOpTy to represent the operator as an HsType, aligning it
with the approach taken by OpApp and HsExpr.

User-facing changes:

1. Infix holes (t1 `_` t2) are now permitted in types, following the
   precedent set by term-level expressions.

   Test case: T11107

2. Error messages for illegal promotion ticks are now reported at more
   precise source locations.

   Test case: T17865

Internal changes:

* The definition of HsOpTy now mirrors that of OpApp:

    | HsOpTy (XOpTy p)  (LHsType p) (LHsType p) (LHsType p)
    | OpApp  (XOpApp p) (LHsExpr p) (LHsExpr p) (LHsExpr p)

  This moves us one step closer to unifying HsType and HsExpr.

* Ignoring locations,
    the old pattern match (HsOpTy x prom lhs op rhs)
    is now written as     (HsOpTy x lhs (HsTyVar x' prom op) rhs)
    but we also handle    (HsOpTy x lhs (HsWildCardTy x')    rhs)

  Constructors other than HsTyVar and HsWildCardTy never appear
  in the operator position.

* The various definitions across the compiler have been updated to work
  with the new representation, drawing inspiration from the term-level
  pipeline where appropriate.  For example,

     ppr_infix_ty       <=> ppr_infix_expr
     get_tyop           <=> get_op
     lookupTypeFixityRn <=> lookupExprFixityRn
           (the latter is factored out from rnExpr)

Test cases: T11107 T17865

- - - - -
5b6757d7 by mangoiv at 2026-03-27T17:23:19-04:00
ci: build i386 non-validate for deb12

This is a small fix that will unlock ghcup metadata to run, i386 debian
12 was missing as a job.

- - - - -
cf942119 by Cheng Shao at 2026-03-30T15:24:37-04:00
ghc-boot: remove unused SizedSeq instances and functions

This commit removes unused `SizedSeq` instances and functions, only
keeping the bits we need for hpc tick sequence for now.

- - - - -
22c5b7cc by Cheng Shao at 2026-03-30T15:24:38-04:00
ghci: remove unused GHCi.BinaryArray

This patch removes the unused `GHCi.BinaryArray` module from `ghci`.
Closes #27108.

- - - - -
77abb4ab by Cheng Shao at 2026-03-30T15:25:21-04:00
testsuite: mark T17912 as fragile on Windows

T17912 is still fragile on Windows, it sometimes unexpectedly pass in
CI. This especially strains our already scarce Windows CI runner
resources. Mark it as fragile on Windows for the time being.

- - - - -
d741a6cc by Andreas Klebinger at 2026-03-31T04:39:33-04:00
Bump minimum shake version for hadrian.

We also add the shake version we want to stack.yaml

Fixes #26884

- - - - -
5e556f9e by Vladislav Zavialov at 2026-03-31T04:40:16-04:00
Status check for the HsType~HsExpr refactoring (#25121)

Add a test case to track the status of a refactoring project within GHC
whose goal is to arrive at the following declaration:

	type HsType = HsExpr

The rationale for this is to increase code reuse between the term- and
type-level code in the compiler front-end (AST, parser, renamer, type checker).

The status report is saved to testsuite/tests/ghc-api/T25121_status.stdout
and provides useful insights into what needs to happen to make progress on
the ticket.

- - - - -
acffb1b1 by fendor at 2026-03-31T04:41:02-04:00
Extract Binary instances to `GHC.ByteCode.Binary`

- - - - -
e2ea8e25 by fendor at 2026-03-31T04:41:02-04:00
Add `seqNonEmpty` for evaluating `NonEmpty a`

- - - - -
048b00b7 by fendor at 2026-03-31T04:41:02-04:00
Record `LinkableUsage` instead of `Linkable` in `LoaderState`

Retaining a ByteCode `Linkable` after it has been loaded retains its
`UnlinkedBCO`, keeping it alive for the remainder of the program.
This starts accumulating a lot of `UnlinkedBCO` and memory over time.
However, the `Linkable` is merely used to later record its usage in
`mkObjectUsage`, which  is used for recompilation checking.

However, this is incorrect, as the interface file and bytecode objects
could be in different states, e.g. the interface changes, but the
bytecode library hasn't changed so we don't need to recompile and vice
versa.

By computing a `Fingerprint` for the `ModuleByteCode`, and recording it
in the `LinkableUsage`, we know precisely whether the `ByteCode` object
on disk is outdated.

Thus, parts of this commit just makes sure that we efficiently compute a
`Fingerprint` for `ModuleByteCode` and store it in the on-disk
representation of `ModuleByteCode`.

We change the `LoaderState` to retain `LinkableUsage`, which is smaller
representation of a `Linkable`. This allows us to free the unneeded
fields of `Linkable` after linking them.

We declare the following memory invariants that this commit implements:

* No `LinkablePart` should be retained from `LoaderState`.
* `Linkable`s should be unloaded after they have been loaded.

These invariants are unfortunately tricky to automatically uphold, so we
are simply documenting our assumptions for now.

We introduce the `linkable-space` test which makes sure that after
loading, no `DotGBC` or `UnlinkedBCO` is retained.

-------------------------
Metric Increase:
    MultiLayerModulesTH_OneShot
-------------------------

We allocate a bit more, but the peak number of bytes doesn't change.
While a bit unfortunate, accepting the metric increase.

We add multiple new performance measurements where we were able to
observe the desired memory invariants. Further, we add regression tests
to validate that the recompilation checker behaves more correct than
before.

- - - - -
2d1c1997 by Simon Jakobi at 2026-03-31T04:41:46-04:00
Eliminate dictionary-passing in ListMap operations

Mark the ListMap helpers 'INLINABLE' so importing modules can specialise
the 'TrieMap (ListMap m)' methods and avoid recursive dictionary-passing.

See Note [Making ListMap operations specialisable].

Fixes #27097

- - - - -
ed2c6570 by Cheng Shao at 2026-03-31T04:42:33-04:00
testsuite: fix testdir cleanup logic on Windows

testdir cleanup is unreliable on Windows (#13162) and despite existing
hacks in the driver, new failure mode has occurred. This patch makes
it print the warning and carry on when failed to clean up a testdir,
instead of reporting a spurious framework failure. See added comment
for detailed explanation.

- - - - -
d9388e29 by Simon Jakobi at 2026-03-31T13:14:59-04:00
Add regression test for #18177

Closes #18177.

Assisted-by: Codex

- - - - -
6a10045c by mangoiv at 2026-03-31T13:15:43-04:00
ci: allow metric decrease for two tests on i386

There has been a nightly failure on i386 due to a compiler runtime
improvement on i386 debian 12. We allow that.

Metric Decrease (test_env='i386-linux-deb12'):
  T12707 T8095

- - - - -
7fbb4fcb by Rodrigo Mesquita at 2026-04-01T12:16:33+00:00
Bump default language edition to GHC2024

As per the accepted ghc-proposal#632

Fixes #26039

- - - - -
5ae43275 by Peng Fan at 2026-04-01T19:01:06-04:00
NCG/LA64: add cmpxchg and xchg primops

And append some new instructions for LA664 uarch.

Apply fix to cmpxchg-prim by Andreas Klebinger.

Suggestions in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15515

- - - - -
8f95534a by Duncan Coutts at 2026-04-01T19:01:52-04:00
Remove signal-based ticker implementations

Fixes issue #27073

All supported platforms should work with the pthreads + nanosleep based
ticker implementation. This avoids all the problems with using signals.

In practice, all supported platforms were probably using the non-signal
tickers already, which is probably why we do not get lots of reports
about deadlocks and other weirdness: we were definately using functions
that are not async signal safe in the tick handler (such as fflush to
flussh the eventlog).

Only Solaris was explicitly using the timer_create ticker impl, and even
Solaris could probably use the pthreads one (if anyone cared: Solaris is
no longer a Teir 3 supported platform).

Plausibly the only supported platform that this will change will be AIX,
which should now use the pthreads impl.

- - - - -
51b32b0d by Duncan Coutts at 2026-04-01T19:01:52-04:00
Tidy up some timer/ticker comments elsewhere

- - - - -
7562bcd7 by Duncan Coutts at 2026-04-01T19:01:52-04:00
Remove now-unused install_vtalrm_handler

Support function used by both of the signal-based ticker
implementations.

- - - - -
6da127c7 by Duncan Coutts at 2026-04-01T19:01:52-04:00
No longer probe for timer_create in rts/configure

It was only used by the TimerCreate.c ticker impl.

- - - - -
3fd490fa by Duncan Coutts at 2026-04-01T19:01:53-04:00
Note that rtsTimerSignal is deprecated.

- - - - -
63099b0f by Simon Jakobi at 2026-04-01T19:02:39-04:00
Add perf test for #13960

Closes #13960.

- - - - -
58009c14 by Apoorv Ingle at 2026-04-02T09:51:24+01:00
Streamline expansions using HsExpansion (#25001)

Notes added [Error Context Stack] [Typechecking by expansion: overview]
Notes updated Note [Expanding HsDo with XXExprGhcRn] [tcApp: typechecking applications]

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

There are 2 key changes:

1. `HsExpand` datatype mediates between expansions
2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv`

This has some consequences detailed below:

1. `HsExpand` datatype mediates between expansions
   * Simplifies the implementations of `tcExpr` to work on `XExpr`
   * Removes `VACtxt` (and its associated `VAExpansion` and `VACall`) datatype, it is subsumed by simply a `SrcSpan`.
   * Removes the function `addHeadCtxt` as it is now mearly setting a location
   * The function `tcValArgs` does its own argument number management
   * move `splitHsTypes` out of `tcApp`
   * Removes special case of tcBody from `tcLambdaMatches`
   * Removes special case of `dsExpr` for `ExpandedThingTc`
   * Renames `tcMonoExpr` -> `tcMonoLExpr`, `tcMonoExprNC` -> `tcMonoLExpr`
   * Renames `EValArg`, `EValArgQL` fields: `ea_ctxt` -> `ea_loc_span` and `eaql_ctx` -> `eaql_loc_span`
   * Remove `PopErrCtxt` from `XXExprGhcRn`
   * `fun_orig` in tcInstFun depends on the SrcSpan of the head of the application chain (similar to addArgCtxt)
     - it references the application chain head if it is user located, or
      uses the error context stack  as a fallback if it's a generated
      location
   * Make a new variant `GeneratedSrcSpan` in `SrcSpan` for HIEAst Nodes
    - Expressions wrapped around `GeneratedSrcSpan` are ignored and never added to the error context stack
    - In Explicit list expansion `fromListN` is wrapped with a `GeneratedSrcSpan` with `GeneratedSrcSpanDetails` field to store the original srcspan

2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv`
   * Merge `HsThingRn` to `HsCtxt`
   * Landmark Error messages are now just computed on the fly
   * Make HsExpandedRn and HsExpandedTc payload a located HsExpr GhcRn
   * `HsCtxt` are tidied and zonked at the end right before printing

Co-authored-by: simonpj <simon.peytonjones@gmail.com>

- - - - -
bc4b4487 by Zubin Duggal at 2026-04-03T14:22:27-04:00
driver: recognise .dyn_o as a valid object file to link if passed on the command line.
This allows plugins compiled with this suffix to run.

Fixes #24486

- - - - -
5ebb9121 by Simon Jakobi at 2026-04-03T14:23:11-04:00
Add regression test for #16145

Closes #16145.

- - - - -
c1fc1c44 by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Refactor eta-expansion in Prep

The Prep pass does eta-expansion but I found cases where it was
doing bad things.  So I refactored and simplified it quite a bit.

In the new design
* There is no distinction between `rhs` and `body`; in particular,
  lambdas can now appear anywhere, rather than just as the RHS of
  a let-binding.

* This change led to a significant simplification of Prep, and
  a more straightforward explanation of eta-expansion. See the new
     Note [Eta expansion]

* The consequences is that CoreToStg needs to handle naked lambdas.
  This is very easy; but it does need a unique supply, which forces
  some simple refactoring.  Having a unique supply to hand is probably
  a good thing anyway.

- - - - -
21beda2c by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Clarify Note [Interesting dictionary arguments]

Ticket #26831 ended up concluding that the code for
GHC.Core.Opt.Specialise.interestingDict was good, but the
commments were a bit inadequate.

This commit improves the comments slightly.

- - - - -
3eaac1f2 by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Make inlining a bit more eager for overloaded functions

If we have
   f d = ... (class-op d x y) ...
we should be eager to inline `f`, because that may change the
higher order call (class-op d x y) into a call to a statically
known function.

See the discussion on #26831.

Even though this does a bit /more/ inlining, compile times
decrease by an average of 0.4%.

Compile time changes:

 DsIncompleteRecSel3(normal)     431,786,104  -2.2%
    ManyAlternatives(normal)     670,883,768  -1.6%
    ManyConstructors(normal)   3,758,493,832  -2.6% GOOD
MultilineStringsPerf(normal)      29,900,576  -2.8%
            T14052Type(ghci)   1,047,600,848  -1.2%
              T17836(normal)     392,852,328  -5.2%
              T18478(normal)     442,785,768  -1.4%
             T21839c(normal)     341,536,992 -14.1% GOOD
               T3064(normal)     174,086,152  +5.3%  BAD
               T5631(normal)     506,867,800  +1.0%
      hard_hole_fits(normal)     209,530,736  -1.3%
 info_table_map_perf(normal)  19,523,093,184  -1.2%
          parsing001(normal)     377,810,528  -1.1%
          pmcOrPats(normal)       60,075,264  -0.5%

                                 geo. mean    -0.4%
                                 minimum     -14.1%
                                 maximum      +5.3%

Runtime changes
    haddock.Cabal(normal)   27,351,988,792  -0.7%
     haddock.base(normal)   26,997,212,560  -0.6%
 haddock.compiler(normal)  219,531,332,960  -1.0%

Metric Decrease:
    LinkableUsage01
    ManyConstructors
    T17949
    T21839c
    T13035
    TcPlugin_RewritePerf
    hard_hole_fits

Metric Increase:
    T3064

- - - - -
5cbc2c82 by Matthew Pickering at 2026-04-03T19:57:02-04:00
bytecode: Add magic header/version to bytecode files

In order to avoid confusing errors when using stale interface files (ie
from an older compiler version), we add a simple header/version check
like the one for interface files.

Fixes #27068

- - - - -
d95a1936 by fendor at 2026-04-03T19:57:02-04:00
Add constants for bytecode in-memory buffer size

Introduce a common constant for the default size of the .gbc and
.bytecodelib binary buffer.

The buffer is by default set to 1 MB.

- - - - -
b822c30a by mangoiv at 2026-04-03T19:57:49-04:00
testsuite: filter stderr for static001 on darwin

This reactivates the test on x86_64 darwin as this should have been done
long ago and ignores warnings emitted by ranlib on newer version of the
darwin toolchain since they are benign. (no symbols for stub libraries)

Fixes #27116

- - - - -
28ce1f8a by Andreas Klebinger at 2026-04-03T19:58:44-04:00
Give the Data instance for ModuleName a non-bottom toConstr implementation.

I've also taken the liberty to add Note [Data.Data instances for GHC AST Types]
describing some of the uses of Data.Data I could find.

Fixes #27129

- - - - -
8ca41ffe by mangoiv at 2026-04-03T19:59:30-04:00
issue template: fix add bug label

- - - - -
3981db0c by Sylvain Henry at 2026-04-03T20:00:33-04:00
Add more canned GC functions for common register patterns (#27142)

Based on analysis of heap-check sites across the GHC compiler and Cabal,
the following patterns were not covered by existing canned GC functions
but occurred frequently enough to warrant specialisation:

  stg_gc_ppppp  -- 5 GC pointers
  stg_gc_ip     -- unboxed word + GC pointer
  stg_gc_pi     -- GC pointer + unboxed word
  stg_gc_ii     -- two unboxed words
  stg_gc_bpp    -- byte (I8) + two GC pointers

Adding these reduces the fraction of heap-check sites falling back to
the generic GC path from ~1.4% to ~0.4% when compiling GHC itself.

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

- - - - -
d17d1435 by Matthew Pickering at 2026-04-03T20:01:19-04:00
Make home unit dependencies stored as sets

Co-authored-by: Wolfgang Jeltsch <wolfgang@well-typed.com>

- - - - -
92a97015 by Simon Peyton Jones at 2026-04-05T00:58:57+01:00
Add Invariant (NoTypeShadowing) to Core

This commit addresses #26868, by adding
a new invariant (NoTypeShadowing) to Core.

See Note [No type-shadowing in Core] in GHC.Core

- - - - -
8b5a5020 by Simon Peyton Jones at 2026-04-05T00:58:57+01:00
Major refactor of free-variable functions

For some time we have had two free-variable mechanims for types:

* The "FV" mechanism, embodied in GHC.Utils.FV, which worked OK, but
  was fragile where eta-expansion was concerned.

* The TyCoFolder mechanism, using a one-shot EndoOS accumulator

I finally got tired of this and refactored the whole thing, thereby
addressing #27080.   Now we have

* `GHC.Types.Var.FV`, which has a composable free-variable result type,
  very much in the spirit of the old `FV`, but much more robust.
  (It uses the "one shot trick".)

* GHC.Core.TyCo.FVs now has just one technology for free variables.

All this led to a lot of renaming.

There are couple of error-message changes.  The change in T18451
makes an already-poor error message even more mysterious.  But
it really needs a separate look.

We also now traverse the AST in a different order leading to a different
but still deterministic order for FVs and test output has been adjusted
accordingly.

- - - - -
4bf040c6 by sheaf at 2026-04-05T14:56:29-04:00
Add utility pprTrace_ function

This function is useful for quick debugging, as it can be added to a
where clause to pretty-print debugging information:

  fooBar x y
    | cond      = body1
    | otherwise = body2
    where
      !_ = pprTrace_ "fooBar" $
           vcat [ text "x:" <+> ppr x
                , text "y:" <+> ppr y
                , text "cond:" <+> ppr cond
                ]

- - - - -
502e6ffe by Andrew Lelechenko at 2026-04-07T04:47:21-04:00
base: improve error message for Data.Char.chr

As per https://github.com/haskell/core-libraries-committee/issues/384

- - - - -
b21bd52e by Simon Peyton Jones at 2026-04-07T04:48:07-04:00
Refactor FunResCtxt a bit

Fixes #27154

- - - - -
7fe84ea5 by Zubin Duggal at 2026-04-07T19:11:52+05:30
compiler: Warn when -finfo-table-map is used with -fllvm

These are currently not supported together.

Fixes #26435

- - - - -
4a45a7da by Matthew Pickering at 2026-04-08T04:37:29-04:00
packaging: correctly propagate build/host/target to bindist configure script

At the moment the host and target which we will produce a compiler for
is fixed at the initial configure time. Therefore we need to persist
the choice made at this time into the installation bindist as well so we
look for the right tools, with the right prefixes at install time.

In the future, we want to provide a bit more control about what kind of
bindist we produce so the logic about what the host/target will have to
be written by hadrian rather than persisted by the configure script. In
particular with cross compilers we want to either build a normal stage 2
cross bindist or a stage 3 bindist, which creates a bindist which has a
native compiler for the target platform.

Fixes #21970

Co-authored-by: Sven Tennie <sven.tennie@gmail.com>

- - - - -
b0950df6 by Sven Tennie at 2026-04-08T04:37:29-04:00
Cross --host and --target no longer required for cross (#21970)

We set sane defaults in the configure script. Thus, these paramenters
aren't required any longer.

- - - - -
fef35216 by Sven Tennie at 2026-04-08T04:37:30-04:00
ci: Define USER_CONF_CC_OPTS_STAGE2 for aarch64/mingw

ghc-toolchain doesn't see $CONF_CC_OPTS_STAGE2 when the bindist gets
configured. So, the hack to override the compiler gets lost.

- - - - -
8dd6f453 by Cheng Shao at 2026-04-08T04:38:11-04:00
ghci: use ShortByteString for LookupSymbol/LookupSymbolInDLL/LookupClosure messages

This patch refactors ghci to use `ShortByteString` for
`LookupSymbol`/`LookupSymbolInDLL`/`LookupClosure` messages as the
first part of #27147.

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

- - - - -
371ef200 by Cheng Shao at 2026-04-08T04:38:11-04:00
ghci: use ShortByteString for MkCostCentres message

This patch refactors ghci to use `ShortByteString` for `MkCostCentres`
messages as a first part of #27147. This also considerably lowers the
memory overhead of breakpoints when cost center profiling is enabled.

-------------------------
Metric Decrease:
    interpreter_steplocal
-------------------------

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

- - - - -
4a122bb6 by Phil Hazelden at 2026-04-08T20:49:42-04:00
Implement modifiers syntax.

The `%m` syntax of linear types is now accepted in more places, to allow
use by future extensions, though so far linear types is still the only
consumer.

This may break existing code where it

* Uses -XLinearTypes.
* Has code of the form `a %m -> b`, where `m` can't be inferred to be
  kind Multiplicity.

The code can be fixed either by adding a kind annotation, or by setting
`-XLinearTypes -XNoModifiers`.

Proposal:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0370-mo...

- - - - -
07267f79 by Zubin Duggal at 2026-04-08T20:50:25-04:00
hadrian: Don't include the package hash in the haddock directory

Since GHC 9.8 and hash_unit_ids, haddock urls have looked like`ghc-9.10.3/doc/html/libraries/base-4.20.2.0-39f9/**/*.html`

The inclusion of the hash makes it hard for downstream non-boot packages to properly link to these files, as the hash is not
part of a standard cabal substitution.

Since we only build one version of each package, we don't need the hash to disambiguate anything, we can just remove it.

Fixes #26635

- - - - -
0a83b95b by ARATA Mizuki at 2026-04-08T20:51:18-04:00
testsuite: Allow multiple ways to be run by setting multiple command-line options

This patch allows multiple `--test-way`s to take effect, like:

$ hadrian/build test --test-way=normal --test-way=llvm

Previously, only one way was run if the test speed was 'normal' or 'fast'.

Closes #26926

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

- - - - -
e841931c by Teo Camarasu at 2026-04-08T20:52:00-04:00
doc: improve eventlog-flush-interval flag documentation

We mention the performance cost and how this flag can be turned off.

Resolves #27056

- - - - -
e332db25 by Teo Camarasu at 2026-04-08T20:52:01-04:00
docs/user_guide: fix typo

- - - - -
5b82080a by Simon Jakobi at 2026-04-08T20:52:44-04:00
Fix -dsuppress-uniques for free variables in demand signatures

Before:          Str=b{sXyZ->S}
With this patch: Str=b{S}

T13143.stderr is updated accordingly.

Fixes #27106.

- - - - -
b7a084cc by Simon Jakobi at 2026-04-08T20:53:27-04:00
Documentation fixes for demand signature notation

Fixes #27115.

- - - - -
59391132 by Simon Jakobi at 2026-04-08T20:54:08-04:00
Use upsert for non-deleting map updates

Some compiler functions were using `alter`, despite never removing
any entries: they only update an existing entry or insert a new one.

These functions are converted to using `upsert`:

    alter  :: (Maybe a -> Maybe a) -> Key -> Map a -> Map a
    upsert :: (Maybe a ->       a) -> Key -> Map a -> Map a

`upsert` variants are also added to APIs of the various Word64Map
wrapper types.

The precedent for this `upsert` operation is in the containers library:
see https://github.com/haskell/containers/pull/1145

    Metrics: compile_time/bytes allocated
    -------------------------------------

        geo. mean:    -0.1%
        minimum:      -0.5%
        maximum:      +0.0%

Resolves #27140.

- - - - -
da7e82f4 by Cheng Shao at 2026-04-08T20:54:49-04:00
testsuite: fix testsuite run for +ipe again

This patch makes the +ipe flavour transformer pass the entire
testsuite again by dropping stdout/stderr checks of certain tests that
are sensitive to stack layout changes with `+ipe`. Related: #26799.

- - - - -
b135a87d by Zubin Duggal at 2026-04-09T19:36:50+05:30
Bump directory submodule to 1.3.11.0 (unreleased)

- - - - -
3a291d07 by Zubin Duggal at 2026-04-09T19:36:50+05:30
Bump file-io submodule to 0.2.0

- - - - -
e0ab606d by Zubin Duggal at 2026-04-10T18:40:20+05:30
Release notes for GHC 10.0

- - - - -
e08b9b34 by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump ghc-prim version to 0.14.0

- - - - -
a92aac6e by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump template-haskell to 2.25.0.0; update submodule exceptions for TH 2.25

- - - - -
f254d9e8 by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump GHC version to 10.0

- - - - -
6ce0368a by Zubin Duggal at 2026-04-10T18:40:28+05:30
Bump base to 4.23.0.0; update submodules for base 4.24 upper bound

- - - - -
702fb8a5 by Zubin Duggal at 2026-04-10T18:40:28+05:30
Bump GHC version to 10.1; update submodules template-haskell-lift and template-haskell-quasiquoter for ghc-internal 10.200

- - - - -
75df1ca4 by Zubin Duggal at 2026-04-10T18:40:28+05:30
Use changelog.d for release notes (#26002)

GHC now uses a fragment-based changelog workflow using a custom script adapted from https://codeberg.org/fgaz/changelog-d.

Contributors add a file in changelog.d/ for each user-facing change.
At release time, these are assembled into release notes for sphinx (in RST) format, using
the tool.

New hadrian `changelog` target to generate changelogs

CI job to validate changelog entries for MRs unless skipped with ~"no-changelog" label

Teach sphinx about ghc-mr: extlink to link to MRs

Remove `ghc-package-list` from sphinx, and implement it in changelog-d instead (Fixes #26476).

(cherry picked from commit 989c07249978f418dfde1353abfad453f024d61a)

- - - - -
585d7450 by Luite Stegeman at 2026-04-11T02:17:13-04:00
tc: discard warnings in tcUserStmt Plan C

We typecheck let_stmt twice, but we don't want the warnings twice!

see #26233

- - - - -
2df604e9 by Sylvain Henry at 2026-04-11T02:19:30-04:00
Introduce TargetInt to represent target's Int (#15973)

GHC was using host 'Int' in several places to represent values that
live in the target machine's 'Int' type.  This is silently wrong when
cross-compiling from a 32-bit host to a 64-bit target: the host Int
is 32 bits while the target Int is 64 bits.

See Note [TargetInt] in GHC.Platform.

Also used the opportunity to make DynTag = Word8.

Fixes #15973

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

- - - - -
d419e972 by Luite Stegeman at 2026-04-13T15:16:04-04:00
Suppress desugaring warnings in the pattern match checker

Avoid duplicating warnings from the actual desugaring pass.

fixes #25996

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

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

- - - - -
d1ddfd4b by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Add test for #25636

The existing test behaviour of "T23146_liftedeq" changed because the
simplifier now does a bit more inlining. We can restore the previous bad
behavior by using an OPAQUE pragma.

This test doubles as a test for #25636 when run in ghci, so we add it as
such.

- - - - -
b9df40ee by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
refactor: protoBCOName is always a Name

Simplifies the code by removing the unnecessary type argument to
ProtoBCO which was always 'Name'

- - - - -
5c2a179e by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Allocate static constructors for bytecode

This commit adds support for static constructors when compiling and
linking ByteCode objects.

Top-level StgRhsCon get lowered to ProtoStaticCons rather than to
ProtoBCOs. A ProtoStaticCon gets allocated directly as a data con
application on the heap (using the new primop newConApp#).

Previously, we would allocate a ProtoBCO which, when evaluated, would
PACK and return the constructor.
A few more details are given in Note [Static constructors in Bytecode].

Secondly, this commit also fixes issue #25636 which was caused by
linking *unlifted* constructors in BCO instructions as
    - (1) a thunk indexing the array of BCOs in a module
    - (2) which evaluated to a BCO which still had to be evaluated to
      return the unlifted constructor proper.

The (2) issue has been resolved by allocating the static constructors
directly. The (1) issue can be resolved by ensuring that we allocate all
unlifted top-level constructors eagerly, and leave the knot-tying for
the lifted BCOs and top-level constructors only.

The top-level unlifted constructors are never mutually recursive, so we
can allocate them all in one go as long as we do it in topological
order. Lifted fields of unlifted constructors can still be filled by the
knot-tied lifted variables since in those fields it is fine to keep
those thunks. See Note [Tying the knot in createBCOs] for more details.

Fixes #25636

-------------------------
Metric Decrease:
    LinkableUsage01
-------------------------

- - - - -
cde47053 by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Revert "StgToByteCode: Assert that PUSH_G'd values are lifted"

This reverts commit ec26c54d818e0cd328276196930313f66b780905.

Ever since f7a22c0f4e9ae0dc767115d4c53fddbd8372b777, we now do support
and will link top-level unlifted constructors into evaluated and
properly tagged values which we can reference with PUSH_G.

This assertion is no longer true and triggered a failure in T25636

- - - - -
c7a7e5b8 by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
refactor: Tag more remote Ptrs as RemotePtr

Pure refactor which improves the API of

- GHC.ByteCode.Linker
- GHC.Runtime.Interpreter
- GHC.Runtime.Interpreter.Types.SymbolCache

by using `RemotePtr` for more functions which used to return `Ptr`s that
could potentially be in a foreign process. E.g. `lookupIE`,
`lookupStaticPtr`, etc...

- - - - -
fc59494c by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Add float# and subword tests for #25636

These tests cover that static constructors in bytecode work correctly
for Float# and subword values (Word8#, Word16#)

- - - - -
477f521b by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
test: Validate topoSort logic in createBCOs

This test validates that the topological sorting and ordering of the
unlifted constructors and lifted constructors in `createBCOs` is
correct.

See `Note [Tying the knot in createBCOs]` for why tying the knot for the
created BCOs is slightly difficult and why the topological sorting is
necessary.

This test fails when `let topoSortedObjs = topSortObjs objs` is
substituted by `let topoSortedObjs = zip [0..] objs`, thus witnessing
the toposort logic is correct and necessary.

The test calls the ghci `createBCOs` directly because it is currently
impossible to construct in Source Haskell a situation where a top-level
static unlifted constructor depends on another (we don't have top-level
unlifted constructors except for nullary constructors like `Leaf ::
(UTree :: UnliftedType)`).

This is another test for fix for #25636

- - - - -
2d9c30be by Simon Jakobi at 2026-04-14T18:42:00-04:00
Improve tests for `elem`

...in order to simplify the work on #27096.

* Improve T17752 by including the Core output in golden files, checking
  both -O1 and -O2.
* Add tests for fusion and no-fusion cases.

Fixes #27101.

- - - - -
2dadf3b0 by sheaf at 2026-04-16T13:28:39-04:00
Simplify mkTick

This commit simplifies 'GHC.Core.Utils.mkTick', removing the
accumulating parameter 'rest' which was suspiciously treating a bunch of
different ticks as a group, and moving the group as a whole around the
AST, ignoring that the ticks in the group might have different placement
properties.

The most important change is that we revert the logic (added in 85b0aae2)
that allowed ticks to be placed around coercions, which caused serious
issues (e.g. #27121). It was just a mistake, as it doesn't make sense
to put a tick around a coercion.

Also adds Note [Pushing SCCs inwards] which clarifies the logic for
pushing SCCs into lambdas, constructor applications, and dropping SCCs
around non-function variables (in particular the treatment of splittable
ticks).

A few other changes are also implemented:

  - simplify 'can_split' predicate (no functional change)
  - combine profiling ticks into one when possible

Fixes #26878, #26941 and #27121

Co-authored-by: simonpj <simon.peytonjones@gmail.com>

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

Closes #9074.

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

- - - - -
e8a196c6 by sheaf at 2026-04-16T13:31:19-04:00
Deal with 'noSpec' in 'coreExprToPmLit'

This commit makes two separate changes relating to
'GHC.HsToCore.Pmc.Solver.Types.coreExprAsPmLit':

  1. Commit 7124e4ad mistakenly marked deferred errors as non-canonical,
     which led to the introduction of 'nospec' wrappers in the
     generated Core. This reverts that accident by declaring deferred
     errors as being canonical, avoiding spurious 'nospec' wrapping.
  2. Look through magic identity-like Ids such as 'nospec', 'inline' and
     'lazy' in 'coreExprAsPmLit', just like Core Prep does.
     There might genuinely be incoherent evidence, but that shouldn't
     obstruct the pattern match checker. See test T27124a.

Fixes #25926 #27124

-------------------------
Metric Decrease:
    T3294
-------------------------

- - - - -
8cb99552 by Sylvain Henry at 2026-04-16T19:22:43-04:00
hadrian: warn when package index is missing (#16484)

Since cabal-install 3.0 we can query the path of remote-repo-cache and
check if hackage package index is present.

Fixes #16484

- - - - -
d6ce7477 by Richard Eisenberg at 2026-04-16T19:23:25-04:00
Teach hadrian to --skip-test.

Fixes #27188.

This adds the --skip-test flag to `hadrian build`, as documented in the
patch.

- - - - -
7666f4a9 by Fendor at 2026-04-17T22:29:51-04:00
Migrate `ghc-pkg` to use `OsPath` and `file-io`

`ghc-pkg` should use UNC paths as much as possible to avoid MAX_PATH
issues on windows.

`file-io` uses UNC Paths by default on windows, ensuring we use the
correct APIs and that we finally are no longer plagued by MAX_PATH
issues in CI and private machines.

On top of it, the higher correctness of `OsPath` is appreciated in this
small codebase. Also, we improve memory usage very slightly, due to the
more efficient memory representation of `OsPath` over `FilePath`

Adds `ghc-pkg` regression test for MAX_PATH on windows

Make sure `ghc-pkg` behaves as expected when long paths (> 255) are
involved on windows.

Let's generate a testcase where we can actually observe that `ghc-pkg`
behaves as epxected.

See the documentation for windows on Maximum Path Length Limitation:

* `https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation`

Adds changelog entry for long path support in ghc-pkg.

- - - - -
78434e8c by Simon Peyton Jones at 2026-04-17T22:30:38-04:00
Kill off the substitution in Lint

Now that we have invariant (NoTypeShadowing) we no longer
need Lint to carry an ambient substitution.  This makes it
simpler and faster.  A really worthwhile refactor.

There are some knock-on effects

* Linting join points after worker/wrapper.  See
  Note [Join points and beta redexes]

* Running a type substitution after the desugarer.
  See Note [Substituting type-lets] in
  the new module GHC.Core.SubstTypeLets

Implements #27078

Most perf tests don't use Lint so we won't see a perf incresae.
But T1969, which uses -O0 and Lint, gets 1.3% worse because it has
to run the SubstTypeLets pass which is a somewhat expensive no-op

Overall though compile-time allocations are down 0.1%.

Metric Increase:
    T1969

- - - - -
86ca6c2c by mangoiv at 2026-04-17T22:31:22-04:00
testsuite: inline elemCoreTest

Some weird (probably python scoping) rule caused elemCoreTest, a regex
being out of scope on ubuntu, presumably because of a newer python version.
This patch just inlines the regex, which fixes the issue.

Fixes #27193

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

- - - - -
b9cab907 by sheaf at 2026-04-20T20:15:44-04:00
Mark some SIMD tests as broken on i386 optllvm

As seen in #25498, several SIMD tests are broken on i386 in the optllvm
way. This commit marks them as "expect_broken".

- - - - -
76528cc3 by Wolfgang Jeltsch at 2026-04-20T20:16:25-04:00
Move most of the `System.IO` implementation into `base`

This involves a rewrite of the `combine` helper function to avoid the
use of `last`, which would now be flagged as an error.

Metric Decrease:
    LinkableUsage01
    T3294
Metric Increase:
    T12227
    T12707
    T5642

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

- - - - -
014087e7 by Luite Stegeman at 2026-04-21T14:05:34-04:00
CodeOutput: Fix finalizers on multiple platforms

 - ELF platforms: emit .fini_array section
 - wasm32/Darwin: emit initializer with __cxa_atexit call
 - Windows: use -Wl,--whole-archive to prevent dropping finalizer symbols
 - rts linker: fix crash/assertion failure unloading objects with finalizers

fixes #27072

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

Closes #10531.

- - - - -
86a646a6 by Andreas Klebinger at 2026-04-22T13:00:05-04:00
Revert use of generic instances for compiler time perf reasons.

Revert "Derive Semigroup/Monoid for instances believed could be derived in #25871"

This reverts commit 11a04cbb221cc404fe00d65d7c951558ede4caa9.

Revert "add Ghc.Data.Pair deriving"

This reverts commit 15d9ce449e1be8c01b89fd39bdf1e700ea7d1dce.

- - - - -
bc9ee1cf by Wen Kokke at 2026-04-22T13:00:51-04:00
hadrian: Fix docs to remove static flavour

In 638f6548, the static flavour was turned into into the fully_static
flavour transformer. However, this commit did not update flavours.md.

- - - - -
cc9cc6d5 by Cheng Shao at 2026-04-23T09:40:46+00:00
configure: bump LlvmMaxVersion to 23

This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases.

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

- - - - -
5574ee10 by Cheng Shao at 2026-04-24T08:24:30-04:00
compiler: avoid unused temporary `appendFS` operands

This patch fixes unused temporary `appendFS` operands in the codebase
that are retained in the `FastString` table after concatenation.
Rewrite rules are added so that if an operand is
`fsLit`/`mkFastString`, the `appendFS` application is rewritten to
append the `ShortByteString` operands first. The patch also fixes
`sconcat` behavior to align with `mconcat` for the same reason. Fixes #27205.

- - - - -
4ed78760 by mangoiv at 2026-04-24T08:25:13-04:00
contributing: adjust MR template to be less verbose

- MR template only shows text that is relevant for submissiong
- MR template was rewritten so it's readable from a user's and reviewer's
  perspective

Resolves #27165

Co-Authored-By: @sheaf

- - - - -
87db83e2 by Cheng Shao at 2026-04-24T14:37:21-04:00
ci: bump freebsd boot ghc to 9.10.3

This commit bumps freebsd boot ghc to 9.10.3 to align with other
platforms and prevent outdated boot libs in boot ghc to block the
freebsd job.

- - - - -
17e3a0b7 by Cheng Shao at 2026-04-24T14:37:21-04:00
compiler: improve Binary instance of Array

This patch improves the `Binary` instance of `Array`:

- We no longer allocate intermediate lists. When serializing an
  `Array`, we iterate over the elements directly; when deserializing
  it, we allocate the result `Array` and fill it in a loop.
- Now we only serialize the array bounds tuple; the length field is
  not needed.

Closes #27109.

- - - - -
2d30f7d3 by sheaf at 2026-04-24T14:38:23-04:00
Vendor mini-QuickCheck for testsuite

This commit extracts the vendored QuickCheck implementation from the
foundation testsuite to make it more broadly available in the GHC
testsuite, and makes use of it in the simd006 test (which also used
a vendored QuickCheck implementation).

On the way, we update the linear congruential generator to avoid the
shortcoming of only generating 31 bit large numbers.

Fixes #25990 and #25969.

- - - - -
1350271b by sheaf at 2026-04-27T09:32:53-04:00
Ensure TcM plugins are only initialised once

This commit ensures we keep TcM plugins (typechecker plugins,
defaulting plugins and hole fit plugins) running all the way through
desugaring, instead of stopping them at the end of typechecking.

To do this, the "stop" actions of TcPlugin and DefaultingPlugin are
split into two: one for the "post-typecheck" action, and one for the
final shutdown action (after desugaring).

This allows the plugins to be invoked by the pattern match checker
(during desugaring) without having to be repeatedly re-initialised and
stopped, fixing #26839.

In the process, this commit modifies 'initTc' and 'initTcInteractive',
adding an extra argument that describes whether to start/stop the 'TcM'
plugins.

See Note [Stop TcM plugins after desugaring] for an overview.

- - - - -
42549222 by sheaf at 2026-04-27T09:33:50-04:00
Hadrian: add --keep-response-files

This commit adds a Hadrian flag that allows response files to be
retained. This is useful for debugging a failing Hadrian command line.

- - - - -
40564e8d by sheaf at 2026-04-27T09:34:46-04:00
hadrian/build-cabal.bat: fix build on Windows

Commit 8cb99552f6 introduced a warning for a missing package index.
However, the logic was faulty on Windows: the piping was broken, and
"remote-repo-cache:" was being interpreted as a (malformed) drive letter,
leading to the error:

  The filename, directory name, or volume label syntax is incorrect.

This commit fixes that by using a temporary file instead of piping.

- - - - -
14bc71e4 by Sven Tennie at 2026-04-28T13:22:47-04:00
ghc: Distinguish between having an interpreter and having an internal one

Actually, these are related but different things:

- ghc can run an interpreter (either internal or external)
- ghc is compiled with an internal interpreter

Splitting the logic solves compiler warnings and expresses the intent
better.

- - - - -
df691563 by Vladislav Zavialov at 2026-04-28T13:23:29-04:00
Refactor HsWildCardTy to use HoleKind (#27111)

The payload of this patch is that the extension fields of HsWildCardTy
and HsHole now match:

	type instance XWildCardTy Ghc{Ps,Rn} = HoleKind
	type instance XHole       Ghc{Ps,Rn} = HoleKind

This is progress towards unification of HsExpr and HsType.
Test case: T25121_status

In addition to that, exact-printing of infix holes is fixed.
Test case: PprInfixHole

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

- - - - -
28f07d70 by fendor at 2026-04-28T13:24:12-04:00
Make HPC work with bytecode interpreter

Add support to generate .tix files from bytecode objects and the
bytecode interpreter.

Conceptually, we insert HPC ticks into the bytecode similar to how we insert
breakpoints.
HPC and breakpoints do not share the same tick array but we use a separate
tick-array for hpc/breakpoint ticks during bytecode generation.

We teach the bytecode interpreter to handle hpc ticks.
The implementation is quite trivial, simply increment the counter in the
global hpc_ticks array for the respective module.

This hpc_ticks array is generated as part of the `CStub`, so we can rely
on it existing.

A tricky bit is "registering" a bytecode object for HPC instrumentation.
In the compiled case, this is achieved via CStub and initializer/finalizers
`.init` sections which are called when the executable is run.
After the initializers have been invoked, which is before `hs_init_ghc`,
we then call `startup_hpc` in `hs_init_ghc` iff any modules were "registered"
for hpc instrumentation via `hs_hpc_module`.

Since bytecode objects are loaded after starting up GHCi, this workflow
doesn't work for supporting `hpc` and the `hpc` run-time is never
started, even if a module is added for instrumentation.

We fix this issue by employing the same technique as is for `SptEntry`s:

* We introduce a new field to `CompiledByteCode`, called `ByteCodeHpcInfo`
  which contains enough information to call `hs_hpc_module`, allowing us to
  register the module for `hpc` instrumentation`.
* After registering the module, we unconditionally call `startupHpc`, to make
  sure the .tix file is written.

Calling `startupHpc` multiple times is safe.
Calling `hs_hpc_module` multiple times for the same module is also safe.

If we didn't register the hpc module in this way, evaluating a bytecode object
instrumented with `-fhpc` without registering it in the `hpc` run-time will
simply not generate any `.tix` files for this bytecode object.

However, this shouldn't happen if everything is set up correctly.

Closes #27036

- - - - -
950879f0 by Vladislav Zavialov at 2026-04-28T13:24:55-04:00
Move NamespaceSpecifier from x-fields into the AST proper (#26678)

This refactoring moves NamespaceSpecifier out of extension fields and into the
AST proper, as it is part of the user-written source, and is not pass-specific.

Summary of changes:

* Move NamespaceSpecifier from GHC/Hs/Basic.hs to Language/Haskell/Syntax/ImpExp.hs
  and parameterise it by the compiler pass, creating the necessary extension points
* Move NamespaceSpecifier out of XFixitySig into FixitySig
* Move NamespaceSpecifier out of XIEThingAll (IEThingAllExt) into IEThingAll
* Move NamespaceSpecifier out of XIEWholeNamespace (IEWholeNamespaceExt) into IEWholeNamespace

This is a pure refactoring with no change in behaviour.

- - - - -
9797052b by Simon Peyton Jones at 2026-04-28T13:25:37-04:00
Fix assertion check in checkResultTy

As #27210 shows, the assertion was a little bit too eager.

I refactored a bit by moving some code from GHC.Tc.Gen.App
to GHC.Tc.Utils.Unify; see the new function tcSubTypeApp,
which replaces tcSubTypeDS

- - - - -
9f85f034 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Make cmm 'import "package" name;' syntax use consistent label types

There is a little-used syntactic form in cmm imports:

import "package" foo;

Which means to import foo from the given package (unit id, specified as
a string). This syntax is somewhat reminiscent of GHC's package import
extension.

This syntax form is not used in the rts cmm code, nor any of the boot
libraries. It may not be used at all. Unclear.

Change the kind of CLabel this syntax generates to be consistent with
the others. The other cmm imports use ForeignLabel with
ForeignLabelInExternalPackage. For some reason this form was using
CmmLabel. Change that to also be ForeignLabel but with
ForeignLabelInPackage. This specifies a specific package, rather
than an unnamed external package.

- - - - -
a811f68f by Duncan Coutts at 2026-04-30T04:52:42-04:00
Change default cmm import statements to be internal

Previously a cmm statement like:

import foo;

meant to expect the symbol from a different shared library than the
current one.

Now it means to expect the symbol from the same shared library as the
current one. We'll add explicit syntax to indicate that it's a foreign
import. Most existing uses are in fact intenal (rts to rts), so few
imports will need to be annotated foreign. Examples would include cmm
code in libraries (other than the rts) that need to access RTS APIs.

In practice, this makes no difference whatsoever at the moment on any
platform other than windows (where building Haskell libs as shared libs
does not fully work yet), since the 'labelDynamic' treats all such
labels as foreign, irrespective of the foreign label source.

- - - - -
17fe5d1d by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm import syntax 'import DATA foo;' as better name for CLOSURE

The existing syntax is:

import CLOSURE foo;

The new syntax is

import DATA foo;

This means to interpret the symbol foo as refering to data (i.e. a
global constant or variable) rather than to code (a function). The
historical syntax for this uses CLOSURE, which is rather misleading.
Presumably this was done to avoid introducing new reserved words.

Be less squemish about new reserved words and add DATA and use that.
Keep the existing CLOSURE syntax as an alias for compatibility.

- - - - -
3a530d68 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm 'import extern name;' syntax

Since the default for cmm imports is now for symbols within the same
shared object, we need a way to indicate we want a symbol from an
external shared object:

import extern foo;      -- for a function
import extern DATA foo; -- for data

This adds a new reserved word 'extern'.

We don't expect to have to use this much. Most cmm imports are
intra-DSO.

This makes no difference currently on ELF and MachO platforms, but does
make a difference to the linking conventions on PE (Windows).

In future it's plausible we could take make distinctions on ELF or
MachO, so it's worth trying to get it right. Windows can be the guinea
pig.

- - - - -
2b8e44c7 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm syntax 'import "package" DATA foo;' for completeness

We already have:

import DATA foo;      -- for data imports
import "package" foo; -- for imports from a given unitid

There's no reason not to have both at once:

import "package" DATA foo;

So add that.

- - - - -
ee05e5cc by Duncan Coutts at 2026-04-30T04:52:42-04:00
Improve the commentary for the cmm import grammar.

AFAIK, this is the only place where GHC-style Cmm syntax is documented.

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

- - - - -
d59b7c71 by Wolfgang Jeltsch at 2026-04-30T04:53:25-04:00
Move code that uses `GHC.Internal.Text.Read` into `base`

This contribution serves to remove all dependencies on
`GHC.Internal.Text.Read` from within `ghc-internal`, so that the
implementation of `Text.Read` and ultimately more reading-related code
can be moved to `base` as well.

The following things are moved from `ghc-internal` to `base`:

  * I/O-related `Read` instances
  * Most of the `Numeric` implementation
  * The instance `Read ByteOrder`
  * The `parseVersion` operation
  * The `readConstr` operation

Metric Increase:
    LinkableUsage01
    T9198
    T12425
    T13035
    T13820
    T18140

- - - - -
5bd6a964 by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00
New rts Message to {set,unset} TSO flags

This commit introduces stg_MSG_SET_TSO_FLAG_info and
stg_MSG_UNSET_TSO_FLAG_info, which allows setting flags of a TSO other
than yourself.

This is especially useful/necessary to set breakpoints and toggle
breakpoints of different threads, which is needed to safely implement
features like pausing, toggling step-out, toggling step-in per thread,
etc.

Fixes #27131

-------------------------
Metric Decrease:
    T3294
-------------------------

- - - - -
ce97fd3e by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00
test: Add test setting another TSO's flags

Introduces a test that runs on two capabilities. The main thread running
on Capability 0 sets the flags on a TSO running on Capability 1.
The TSO from Capability 1 itself checks whether its flags were set and
reports that back.

This validates that the RTS messages for setting TSO flags work, even if
it doesn't test a harsher scenario with race conditions to exercise why
the message passing is necessary for safely setting another TSO's flags.

Part of #27131

- - - - -
a4ff6315 by David Eichmann at 2026-04-30T04:54:51-04:00
Hadrian: withResponseFile outputs response file when verbodity is Verbose

At the Verbose verbosity, shake will display full commandlines. With the
use of response files, the full command is hidden. That makes it hard to run
the command manually. This commit outputs the contents of the response
file so that that full command can be recreated and also hints at the
use of the --keep-response-files hadrian flag.

- - - - -
cd732ee3 by Duncan Coutts at 2026-04-30T04:54:51-04:00
Use response files for hadrian linking with ghc (support long command lines)

In future support for windows dynamic linking, we expect long command
lines for linking dll files with ghc. Experiments with dynamic linking the
ghc-internal library yielded a link command well over 32kb. We did not
encounter this before for static libs, since we already use ar's @file
feature (if available, which it is for the llvm toolchain).

Co-authored-by: David Eichmann <davide@well-typed.com>

- - - - -
3d41368f by Andreas Klebinger at 2026-04-30T04:55:32-04:00
Split GHC.Driver.Main.hs up into multiple components.

This commit splits GHC.Driver.Main into four components:

* GHC.Driver.Main.Compile
* GHC.Driver.Main.Hsc
* GHC.Driver.Main.Interactive
* GHC.Driver.Main.Passes

We might improve that separation further in the future but this should
hopefully make it easier to reason about and work with this part of the
code.

- - - - -
2128ba85 by Cheng Shao at 2026-04-30T04:56:14-04:00
compiler: avoid unique OccNames for internal Names in bytecode objects

This patch improves bytecode object serialization logic by avoiding
the construction of unique `OccName`s when serializing/deserializing
internal `Name`s. Closes #27213.

-------------------------
Metric Decrease:
    LinkableUsage01
-------------------------

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

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

- - - - -
5c4c3bf4 by Sylvain Henry at 2026-05-02T03:39:28-04:00
testsuite: fix flaky foundation Divisible / mulIntMayOflo# tests (#27222)

Since the LCG was widened to 64 bits and the seed randomised per CI run
(commit 2d30f7d3400 "Vendor mini-QuickCheck for testsuite"), two latent
bugs in the foundation test surface stochastically:

* The Divisible property `(x `div` y) * y + (x `mod` y) == x` raises
  ArithException(Overflow) when (a, b) = (minBound, -1) for fixed-width
  signed Integral types. Split testNumber/testDivisible into Bounded and
  unbounded variants and skip just that one pair, gated by
  `(minBound :: a) < 0` so unsigned types lose no coverage.

* The `mulIntMayOflo#` test compared raw Int# bit-for-bit, but the primop
  is only specified to return 0/non-zero -- the exact non-zero indicator
  legitimately differs between backends and inlining choices. Add a
  dedicated `testPrimopMayOflo` helper that only compares zero / non-zero.

Also fix the long-standing typo "Dividible" -> "Divisible" in identifiers.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

- - - - -
e242ce4f by Sylvain Henry at 2026-05-02T03:39:28-04:00
testsuite: catch and display exceptions in MiniQuickCheck

Exceptions raised while evaluating a property are now caught and reported
as a normal failure (with arguments and seed), instead of aborting the
test.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

- - - - -
9a9ae4df by Duncan Coutts at 2026-05-05T14:44:37-04:00
Use __attribute__((dllimport)) for external RTS symbol declarations

This is needed to be hygenic about DLL symbol imports and exports.
The attribute is ignored on platforms other than Windows.

Use of the attribute however means that external data symbols do not
have a compile-time constant address (they are loaded using an
indirection). This means we have to adjust the rtsSyms initial linker
table so that it is a local constant in a function, rather than a global
constant. We now define it within a function that pre-populates the
symbol table with the RTS symbols.

- - - - -
2ad3e01e by Duncan Coutts at 2026-05-05T14:44:37-04:00
Fix the rts linker declarations for a few data symbols

and ensure that the (windows only) rts_IOManagerIsWin32Native data
symbol is marked as externally visible.

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

- - - - -
96974723 by Teo Camarasu at 2026-05-05T14:45:20-04:00
ghci/TH: refactor to use IORef QState

This is a pure refactor and shouldn't modify semantics at all

- - - - -
eff6bfaf by Teo Camarasu at 2026-05-05T14:45:20-04:00
iserv: recover/getQ/putQ should behave same as internal interpreter

The internal and external interpreter should behave the same when
handling `recover`, the exeception recovery method of Q.
In practice, they diverge. In case of failure, the internal interpreter
only restores error message state to before the computation, wheras the
external interperter restores error message state *and* the state of putQ/getQ.

As far as I can tell this is a simple mistake in the implementation.
Note [TH recover with -fexternal-interpreter] describes the correct
behaviour but the implementation doesn't mirror this.

This change restores the correct behaviour by keeping the effects of
putQ in the erroring computation.

This is a breaking change since it modifies the behaviour of programs
that rely on recover ignoring putQ from failling computations when used
with the external interpreter. Although I highly doubt anyone relies on
this behaviour.

This divergence was first introduced in d00c308633fe7d216d31a1087e00e63532d87d6d.
As far as I can tell this was unintentional and tha commit was trying to solve a different bug.

Resolves #27022

- - - - -
1cb1d672 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add dynamic trace flags API

This commit adds an API to the RTS (exposed via Rts.h) that allows users to dynamically change the trace flags.
Prior to this commit, users were able to stop and start the profiling and heap profiling timers (via startProfTimer/stopProfTimer and startHeapProfTimer/stopHeapProfTimer).
This extends that functionality to also cover the core event types.

The getTraceFlag/setTraceFlag functions read and write the values of the trace flag cache, which is allocated by Trace.c, rather than modifying the members of RtsFlags.TraceFlags.
This is done under the assumption that the members of RtsFlags should not be modified after RTS initialisation.
Consequently, if the user modifies the trace flags using setTraceFlag, the object returned by getTraceFlags (from base) will not reflect these changes.

The trace flags are not protected by locks of any sort.
Hence, these functions are not thread-safe.
However, the trace flags are not modified by the RTS after initialisation, only read, so the race conditions introduced by one user modifying them are most likely benign.

This PR also puts the trace flag cache in a single global struct, as opposed to a collection of global variables, and changes the types of the individual flags from uint8_t to bool, as these have the same size on both Clang and GCC and are a better semantic match.
Prior to the change to uint8_t, they had type int, see 42c47cd6.
Even with its deprecation in C23, I don't think there should be any issue depending on stdbool.h.
The TRACE_X macros are redefined to access the global struct, with values cast to const bool to ensure they are read-only.

- - - - -
9d54dc94 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Ensure TRACE_X values are used in place of RtsFlags.TraceFlags.X

- - - - -
418d737b by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Fix nonmoving-GC tracing

The current nonmoving-GC tracing functions were written in a different
style from the other tracing functions. They were directly implemented
as, e.g., a traceConcMarkEnd function that called postConcMarkEnd.
The other tracing functions are implemented as, e.g., traceThreadLabel_,
a function that posts the thread label event, and traceThreadLabel, a
macro that checks whether TRACE_scheduler is set. This commit fixes that
implementation, and ensures that the nonmoving-GC tracing functions only
emit events if nonmoving-GC tracing is enabled.

- - - - -
99f4afa4 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add SymI_HasProto for get/setTraceFlag

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

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

- - - - -
a3b339a4 by Teo Camarasu at 2026-05-06T09:54:25-04:00
interface-stability/base: don't distinguish ws-32

The interface of base is identical when the Word size is 32bits.
Therefore, there is no need to have another file for this case.
So, we delete it.

Step towards: #26752

- - - - -
eb922183 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Add a rts posix FdWakup utility module

This will be used to implement wakeupIOManager for in-RTS I/O managers.

It provides a notification/wakeup mechanism using FDs, suitable for
situations when a thread is blocked on a set of fds anyway. It uses the
classic self-pipe trick, or equivalently eventfd on supported platforms.

This will initially be used to implement prompt interrupt or shutdown of
the posix ticker thread.

- - - - -
01b0e233 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Add prompt shutdown to the pthread ticker implementation.

The Linux timerfd ticker monitors a pipe which is used by exitTicker to
ensure a prompt wakeup and shutdown. The pthread ticker lacked this and
so would only exit at the next ticker wakeup (10ms by default).

This patch adds the same mechanism to the pthread ticker.

This changes the pthread ticker from waiting by using nanosleep() to
waiting using either ppoll() or select(), so that it can wait on both
a time and a file descriptor. On Linux at least, a test program to
compare the timing jitter of these APIs shows that using nanpsleep,
ppoll or select makes no statistical difference to the maximum or
average jitter.

This is a step towards unifying the posix ticker implementations, so
that we can have just one portable one (albeit with some limited cpp).
It is also a step towards using the ticker as part of a more general
implementation of wakeUpRts, since this will require a method to wake
the rts from a signal handler context (ctl-c handler).

- - - - -
bc41d646 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Update ticker header commentary

It was antique and didn't apply even to the previous implementation, and
certainly not to the updated one.

- - - - -
4ed9a386 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Remove the timerfd-based ticker implementation

There does not appear to be any remaining advantage on Linux to using
the timerfd ticker implementation over the portable one (using ppoll on
Linux for precise timing).

The eventfd implementation was originally added at a time when Linux was
still using a signal based implementation. So it made sense at the time.
See (closed) issue #10840.

- - - - -
97504fa6 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Consolidate to a single posix ticker implementation

Previously we had four implementations, two using signals and two using
threads. Having just one should make behaviour more consistent between
platforms, and should make maintenance easier.

- - - - -
1e60023b by Facundo Domínguez at 2026-05-07T18:01:16-04:00
Generalize so_inline to specify which bindings should be preserved

This commit generalizes the so_inline option of the simple optimizer
so we can indicate with a predicate the specific bindings that should
be kept.

This feature is important for the LiquidHaskell plugin, which relies on the
simple optimizer to make core programs easier to read, but needs to preserve
bindings that are relevant for verification.

See https://gitlab.haskell.org/ghc/ghc/-/issues/24386 for the full discussion.

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

- - - - -
4ac3f7d6 by Vladislav Zavialov at 2026-05-12T09:49:03-04:00
EPA: Use AnnParen for tuples and sums

Summary of changes

* Do not use AnnParen in XListTy, replace it with EpToken "[" and "]"
* Specialise AnnParen to tuple/sums by dropping the AnnParensSquare
  and keeping only AnnParens and AnnParensHash
* Use AnnParen in XExplicitTuple
* Use AnnParen in XExplicitTupleTy
* Use AnnParen in XTuplePat
* Use AnnParen in XExplicitSum (via AnnExplicitSum)
* Use AnnParen in XSumPat (via EpAnnSumPat)

This is a refactoring with no user-facing changes.

- - - - -
1bdcddec by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add minimal dlltool support to ghc-toolchain

The dlltool is a tool that can create dll import libraries from .def
files. These .def files list the exported symbols of dlls. Its somewhat
like gnu linker scripts, but more limited.

We will need dlltool to build the rts and ghc-internal libraries as DLLs
on Windows. The rts and ghc-internal libraries have a recursive
dependency on each other. Import libraries can be used to resolve
recursive dependencies between dlls. We will use an import library for
the rts when linking the ghc-internal library.

- - - - -
f7fc3770 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add minimal dlltool support into ./configure

Find dlltool, and hopefully support finding it within the bundled llvm
toolchain on windows.

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

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

Optional except on windows.

- - - - -
5e14fe3f by Duncan Coutts at 2026-05-12T09:49:48-04:00
Update and generate libHSghc-internal.def from .def.in file

The only symbol that the rts imports from the ghc-internal package now
is init_ghc_hs_iface. So the rts only needs an import lib that defines
that one symbol.

Also, remove the libHSghc-prim.def because it is redundant. The rts no
longer imports anything from ghc-prim.

Keep libHSffi.def for now. We may yet need it once it is clear how
libffi is going to be built/used for ghc.

- - - - -
3d91e4a6 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add rule to build libHSghc-internal.dll.a and link into the rts

On windows only, with dynamic linking.

This is needed because on windows, all symbols in dlls must be resolved.
No dangling symbols allowed. References to external symbols must be
explicit. We resolve this with an import library. We create an import
library for ghc-internal, a .dll.a file. This is a static archive
containing .o files that define the symbols we need, and crucially have
".idata" sections that specifies the symbols the dll imports and from
where.

Note that we do not install this libHSghc-internal.dll.a, and it does
not need to list all the symbols exported by that package. We create a
special purpose import lib and only use it when linking the rts dll, so
it only has to list the symbols that the rts uses from ghc-internal
(which is exactly one symbol: init_ghc_hs_iface).

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

- - - - -
5fab2238 by Wolfgang Jeltsch at 2026-05-12T21:24:27+03:00
Introduce a cache of home module name providers

This contribution introduces to the module graph a cache that maps home
module names to sets of units providing them and changes the finder to
use that cache. This is a performance optimization, especially for
multi-home-unit builds.

The particular changes are as follows:

  * In `GHC.Unit.Module.Graph`, `ModuleGraph` is extended with a new
    field `mg_home_module_name_providers_map`, exposed as
    `mgHomeModuleNameProvidersMap`. This is a cache that assigns to each
    home module name the set of IDs of home units that define it.
    Operations that construct module graphs are updated such that this
    cache stays synchronized.

  * In `GHC.Unit.Finder`, `findImportedModule` is changed to pull
    `mgHomeModuleNameProvidersMap` from `hsc_mod_graph` and pass it to
    `findImportedModuleNoHsc`, which now does not search home units in
    arbitrary order but prioritizes those units that the cache mentions
    as potential providers of the requested module.

In addition, this contribution adds variants of the two multi-component
compiler performance tests that use 100 units instead of 20, because
with just 20 units the benefits from caching of home module name
providers are still negligible.

The following table shows the total time needed for running both
multi-component tests before and after this contribution and with
different numbers of units:

| # of units | Before | After |
|-----------:|-------:|------:|
|         20 |   0:12 |  0:12 |
|        100 |   0:47 |  0:42 |
|        200 |   3:05 |  2:08 |

Note that there seems to be a general overhead of 12 seconds that is not
attributable to the actual tests, so that the real running times should
be 12 seconds smaller than shown above.

Resolves #27055.

Metric Decrease:
    MultiComponentModules
    MultiComponentModulesRecomp

Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
Co-authored-by: Fendor <fendor@posteo.de>

- - - - -
38b76b2f by Cheng Shao at 2026-05-13T17:48:48-04:00
testsuite: mark T22159 as fragile

This patch marks T22159 as fragile on Windows for issue described in #27248.
Before we get to the bottom of those failures, this unblocks newer
Windows runners.

- - - - -
50188615 by Ian Duncan at 2026-05-14T13:45:07+02:00
AArch64: use ASR not LSR for MO_U_Shr at W8/W16

The unsigned right shift (MO_U_Shr) for sub-word widths (W8, W16)
with a variable shift amount was emitting ASR (arithmetic/signed shift
right) after zero-extending with UXTB/UXTH. This should be LSR
(logical/unsigned shift right). After zero-extension the upper bits
happen to be 0 so ASR produces the same result, but it is semantically
wrong and would break if the zero-extension were ever optimized away.
Includes assembly output test (grep for lsr) and runtime test
verifying unsigned right shift of Word8 and Word16 values.

- - - - -
28666fbf by Vladislav Zavialov at 2026-05-19T12:44:05-04:00
Add type families: Tuple, Constraints, Tuple#, Sum# (#27179)

These type families map tuples of types to the corresponding Tuple<N>,
Tuple<N>#, CTuple<N>, and Sum<N># types. Some examples at N=2:

	Tuple (Int, Bool)          = Tuple2 Int Bool
	Constraints (Show a, Eq a) = CTuple2 (Show a) (Eq a)
	Tuple# (Int#, Float#)      = Tuple2# Int# Float#
	Sum# (Int#, Float#)        = Sum2# Int# Float#

See GHC Proposal #145 "Non-punning list and tuple syntax".

To make the Sum# instance at N=64 possible, this patch also introduces
the Sum64# constructor declaration and bumps mAX_SUM_SIZE from 63 to 64.

Metric Increase:
    ghc_experimental_dir

- - - - -
41c2448b by Wen Kokke at 2026-05-19T12:44:53-04:00
rts: Add IPE event class for -l

This commit adds a new IPE event class to the -l RTS flag.
Previously, IPE events were enabled unconditionally.
However, the IPE events can easily grow to hundreds or thousands of megabytes.
With the new event class you can pass, e.g., -l-I to disable IPE events.

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

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

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

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

- - - - -
0da1543f by Duncan Coutts at 2026-05-19T12:45:37-04:00
Document removal of the signal-based interval timer

Update mentions within the RTS section of the users guide.

Add a changelog entry.

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

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

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

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

- - - - -
1a7de232 by Duncan Coutts at 2026-05-20T12:26:25-04:00
Hadrian: remove legacy rts .so symlinks

For compatibility with the old makefile based build system, hadrian had
rules to generate symlinks from unversioned to versioned names for the
rts .so/.dynlib file, like libHSrts-ghcx.y.so -> libHSrts-1.0.3-ghcx.y.so

We no longer need these symlinks since the makefile build system has
been retired some time ago. The need for these symlinks is awkward on
windows where we cannot (in practice) create symlinks. So rather than
make them conditional (non-windows), just remove them entirely.

- - - - -
286f1adf by fendor at 2026-05-20T12:27:09-04:00
Fix regression T27202: `:load` and `:add` work in GHCi

To fix the regression there are conceptually two major things that we
fix:

* We don't remove the `importDirs` from `interactive-session`
* When `:add`ing a module, we don't try to find them via PackageImports
    * The PackageImport is wrong as we can't know the package-name at
      this stage in ghc/UI.hs

What does it mean to not remove the `importDirs` from
`interactive-session`?
It means that, given some initial `DynFlags`, we will use those
`importDirs` in `interactive-session`.

The initial `DynFlags`, however, depend on how you initialise the GHC
session.
For a simple session, initialised by

    ghc -isrc -this-unit-id main

It is simple, just use the `DynFlags` given on the cli.
Thus, `main` and `interactive-session` will have the same `DynFlags`,
except for the `homeUnitId` and `interactive-session` depends on `main`
by construction of the GHCi session.

What about a multiple home unit session, though?

    ghc -unit @unit1 -unit @unit2

What are the `DynFlags` in this cli invocation? It shouldn't be either
`@unti1` nor `@unit2`, as the order shouldn't matter or any other
implicit condition.

For consistency, we decide that the initial `DynFlags` are the top
`DynFlags` on the cli, ignoring `-unit` flags.
Thus, in this example, there are no `importsDirs` regardless of what we
might find in `@unit1` and `@unit2`.

But in this invocation:

    ghc -isrc -unit @unit1 -unit @unit2

The `interactive-session` will have the `importsDirs` `src`.
Note, `-isrc` will be inherited in `@unit1` and `@unit2`, so you need to
explicitly use `-i` to clear the `importsDirs`, in order to avoid
accidentally adding `src` as an import directory to all other home
units.

This fix has been made possible by the improvements introduced in
!15888, which avoids ambiguity when a home unit shares the `importsDirs`
with the `interactive-session`, on top of being much faster for multiple
home units.

Adds regression tests for T27202 for `:load`ing and `:add`ing modules
that are located in import directories.

- - - - -
728662de by fendor at 2026-05-20T12:27:09-04:00
Use home unit package db stacks in GHCi prompt and session unit

In order to import modules from home unit dependencies (e.g., `Data.Map`),
the ghci prompt unit needs to populate its `UnitState`.
This is tricky to handle correctly, which `PackageDBFlag`s should we use
to populate the `UnitState`?
We decide, the most intuitive solution for users is to depend on all
`PackageDBFlag`s, so that any dependency can be imported in GHCi.
This assumes consistency in the `PackageDBFlag`s, so no two home units
specify `PackageDBFlag`s that are inconsistent with each other.

We could simply concat all the `PackageDBFlag`s of the existing home
units, but later `PackageDBFlag`s shadow earlier ones, leading to the
last processed home units' `PackageDBFlag`s to shadow the earlier ones.
This is hard to fix, we need to give users the capability to provide ghc
options for the ghci prompt home unit.
However, as this is considerably more work, we decided on an
approximation that should work out most of the time.

Package Db stacks in cabal and stack follow a certain structure:

    -no-user-package-db > -package-db $cabal-store > -package-db $local-db

The first two arguments are always the same, namely the
`-no-user-package-db` and `-package-db`.
We compute the longest common prefix over all home units, and use that
as the start of the package db stack. Then, over the rest of the
`PackageDBFlag`s, we simply take the union and append them to our
initial stack.
We assume, that the rest of package dbs only defines very few, "local"
units that are usually not shadowing each other.

This allows us to get a relatively consistent package database stack for
the ghci prompt home unit.

Similar reasoning applies to the session unit in order to add modules to
the session and have dependencies available in the module.

We do something similar for `-package` flags, to make sure only the
correct units are actually visible in the ghci session.
This time, we simply take the union of all `PackageFlag`s, allowing us
to import modules from the home unit dependencies.

In the future, it would be beneficial to allow the user to provide the
exact ghc options to control the visibilities. For now, this will have
to do.

- - - - -
740d89a0 by Simon Peyton Jones at 2026-05-20T17:20:44-04:00
Do not use mkCast during typechecking

This commit fixes #27219.  The problem was that the typechecker was using
`mkCast`, whose assertion checks legitimately fail when applied to types
that contain unification variables.

- - - - -
a50fdb06 by Simon Peyton Jones at 2026-05-20T17:20:45-04:00
Major refactor of the Simplifier

The main payload of this patch is to refactor the Simplifer to avoid
repeated simplification when using Plan (AFTER) for rule rewrites.
The need for this was shown up by #26989.

See Note [Avoid repeated simplification] in GHC.Core.Opt.Simplify.Iteration.

Related refactoring:

* Refactor the two fields `sc_dup` and `sc_env` in `ApplyToVal` into one, `sc_env`.
  Reason: the envt is irrelevant in the "simplified" case, so the data type describes
  the possiblitiies much more accurately now.

* Some refactoring in `knownCon` to split off `wrapDataConFloats`.

* Refactor `lookupRule` and its auxiliary functions to return `RuleMatch`,
  a new data type. See Note [data RuleMatch] in GHC.Core. Ditto for BuiltinRule.

  This RuleMatch returns fragments of the target in rm_args and rm_floats,
  leaving `rm_rhs` to be the stuff from the RULE itself.

  Doing this has routine consequences in GHC.Core.Opt.ConstantFold. Many changes
  there but all routine.

* When doing occurrence analysis on RULEs, make the occ-info on the rule
  binders relate just to the RHS, not the LHS.  See (OUR1) in
  Note Note [OccInfo in unfoldings and rules]

  This means that Lint must not complain about the fact that the patterns
  in the RULE mentions binders that are marked dead.
  See Note [Dead occurrences] in GHC.Core.Lint.

  I changed the Core pretty-printer so that it didn't suppress dead binders,
  else I can't see those binders in RULEs.  That led to quite a lot of testsuite wibbles.

* Refactor FloatBinds, so that it is used both by
  `exprIsConApp_mabye` and by `lookupRule`
  * Move the definition of FloatBinds out of GHc.Core.Make, into GHC.Core.
  * Add FloatTick as an extra constructor.
  * Refactor `lookupRule` to use `FloatBinds` instead of `BindWrapper`.
  This refactor just shares more code.

  (Rename GHC.Core.Opt.FloatOut.FloatBinds to FloatLets, to avoid gratuitious
  name clash with GHC.Core.FloatBinds.)

Corecion optimisation

* In simpleOpt, when composing coercions, call new function `optTransCo`.
  This is much lighter weight than full blown coercion optimisation.

* Make `GHC.Core.Opt.Arity.pushCoValArg` and `pushCoTyArg` return the
  coercionLKind of the coercion. This saves recomputing that coercionLKind
  at the key call sites in GHC.Core.Opt.Simplify.Iteration.pushCast.

* Rename `addCoerce` in GHC.Core.Simplify.Iteration to become `pushCast`.

* In the `ApplyToVal` case of `pushCast` we had a very unsavoury call to `simplArg`.
  I eliminated it by adding a field `sc_cast` to `ApplyToVal` that records any
  pending casts.  Much nicer now.  See Note [The sc_cast field of ApplyToVal].

* Don't optimise coercions if the type-substitution is empty.
  See Note [Optimising coercions] in GHC.Core.Opt.Simplify.Iteration.

The fix for #26838 is dramatic.  For the test in perf/compiler/T26839 we have

   Compiler allocs:  Before: 7,363M
                     After:    688M

Compile time goes down generally.  Here are compiler-alloc changes
over 0.5%:
           CoOpt_Read(normal)    729,184,920   -0.7%
     CoOpt_Singletons(normal)    666,916,960   -4.6% GOOD
          LargeRecord(normal)  1,227,056,876   +1.1%
               T12227(normal)    256,827,604   -4.6% GOOD
               T12425(optasm)     76,879,410   -0.8%
               T12545(normal)    787,826,918  -10.8% GOOD
               T12707(normal)    775,186,464   -0.9%
               T13253(normal)    318,599,596   -0.8%
               T14766(normal)    685,857,320   -1.0%
               T15304(normal)  1,123,333,422   -2.2%
               T15630(normal)    123,142,330   -2.6%
              T15630a(normal)    123,092,100   -2.6%
               T15703(normal)    299,751,682   -2.9% GOOD
               T17516(normal)    964,072,280   +1.0%
               T18223(normal)    367,016,820   -6.2% GOOD
               T18730(optasm)    130,643,770   -3.3% GOOD
               T20261(normal)    535,608,584   -0.7%
              T21839c(normal)    340,340,436   -0.9%
               T24984(normal)     85,568,392   -1.9%
                T3064(normal)    174,631,992   -1.2%
                T3294(normal)  1,215,886,432   -0.7%
                T5030(normal)    141,449,704  -17.2% GOOD
             T5321Fun(normal)    258,484,744   -1.9%
                T8095(normal)    770,532,232   -2.7%
                T9630(normal)    858,423,408  -14.5% GOOD
               T9872c(normal)  1,591,709,448   +0.7%
  info_table_map_perf(normal) 19,700,614,458   -1.3%

                    geo. mean                  -0.7%
                    minimum                   -17.2%
                    maximum                    +1.1%

However, strangely there seems to be a 5.0% increase in CoOpt_Read in
the x86_64-linux-fedora43-validate+debug_info+ubsan job, although
there generally a /decrease/ in this test in other builds.  The baseline
value looks strange.  Anyway I'll just accept it.

Metric Decrease:
    CoOpt_Singletons
    T12227
    T12545
    T12707
    T15703
    T18223
    T18730
    T21839c
    T5030
    T9630

Metric Increase:
    CoOpt_Read

- - - - -
834623d4 by Mrjtjmn at 2026-05-20T17:21:41-04:00
users-guide: Fix weird notation in "Summary of stolen syntax"

- - - - -
6f9d7c71 by Markus Läll at 2026-05-21T15:25:34-04:00
Use "grimily" instead of "grimly"

Fixes https://gitlab.haskell.org/ghc/ghc/-/issues/27221

- - - - -
50e999ca by fendor at 2026-05-21T15:26:18-04:00
Speed up 'closure' computation in `ghc-pkg`

Cache the set of already seen `UnitId`s and use `Set` operations to
speed up 'closure' computation.

Further simplify the implementation of 'closure' to account for the
actual usage.
As a consequence, we rename 'closure' to 'brokenPackages' to reflect its
purpose better after the simplification.

- - - - -
7ecc6184 by sheaf at 2026-05-21T15:27:10-04:00
TcMPluginHandling: be more lenient when no plugins

This change ensures that, if a function such as 'typecheckModule' was
invoked with 'NoTcMPlugins', GHC doesn't spuriously complain about TcM
plugins having already been stopped, as there were none to start with.

- - - - -
72c8de5c by Simon Jakobi at 2026-05-23T18:41:42-04:00
Implement List.elem via foldr

...in order to allow specialization to Eq instances.

The implementation of notElem is updated for consistency.`

Corresponding CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/412

Addresses #27096.

- - - - -
3268c610 by Alan Zimmerman at 2026-05-23T18:42:30-04:00
EPA: Fix span for qualified multiline string

Fix the span for a qualified multiline string like

  Text."""
    I'm a multiline
    Text value
    !
  """

to extend to the end of the entire string, not just the first line.

Closes #27274

- - - - -
1f096790 by Alan Zimmerman at 2026-05-23T18:43:20-04:00
EPA: Fix exact printing namespace-specified wildcards

Ensures correct printing of imports of the form

   import Data.Bool (data True(data ..))
   import Data.Bool (data True(type ..))

Closes #27291

- - - - -
56ada7c0 by Mrjtjmn at 2026-05-23T18:44:19-04:00
Fix ambiguous syntax of BangPatterns in users guide

Update documentation for the BangPatterns extension to specify
how surrounding whitespace affects interpretation of `!`.

* Only when there is whitespace before `!` and no whitespace after,
  it is recognized as a BangPattern.
* Other cases `⟨varid⟩!⟨varid⟩`, `⟨varid⟩ ! ⟨varid⟩`, `⟨varid⟩! ⟨varid⟩`
  are treated as infix operators.

- - - - -
579aa0b7 by Simon Jakobi at 2026-05-25T16:31:26-04:00
Ensure that SetOps.{minusList,unionListsOrd} can be specialized

...by marking them INLINABLE. Haddock allocates 0.1–0.3% less as a
result.

This also removes some redundant constraints on unionListsOrd.

- - - - -
cccf45da by Cheng Shao at 2026-05-25T16:32:13-04:00
wasm: ensure post-linker output is synchronous ESM

This patch fixes wasm backend's post-linker output script to ensure
it's synchronous ESM and doesn't use top-level await, which doesn't
work in ServiceWorkers. Fixes #27257.

- - - - -
8db331a3 by Zubin Duggal at 2026-05-26T04:54:03-04:00
Update to semaphore-compat 2.0.0 using v2 of the protocol

On Linux and other POSIX platforms, GHC's -jsem jobserver client now
speaks v2 of the semaphore-compat protocol, which uses Unix domain
sockets in place of POSIX named semaphores. This avoids the libc-ABI
issues that affected the old implementation. Windows is unaffected
and continues to use the v1 protocol (Win32 named semaphores); its
reported protocol version remains v1.

When GHC receives a -jsem name whose protocol version it does not
support, it emits a -Wsemaphore-version-mismatch warning and falls
back to -j<N> rather than crashing. ghc --info exposes the supported
version in a new "Semaphore version" entry so cabal-install can detect
a mismatch before invoking GHC.

Users on a cabal-install that predates the v2 update will continue to
build successfully on Linux/POSIX, but will lose the cross-process
-jsem coordination and fall back to -j<N> per GHC invocation. Users
must upgrade to a cabal-install that supports protocol v2 to recover
full parallelism.

Also fix a leak in cleanupSem (#27253): cleanupSem used to snapshot
heldTokens and release them before killing the loop, while the loop's
in-flight acquire/release children could still be mutating it.
Cleanup now runs inside the loop's own exit handler, after draining
the active child via a new activeChild TVar, so the snapshot has no
concurrent mutator.

See also:
  - GHC proposal amendment:  https://github.com/ghc-proposals/ghc-proposals/pull/673
  - cabal-install patch:     https://github.com/haskell/cabal/pull/11628
  - semaphore-compat MR:     https://gitlab.haskell.org/ghc/semaphore-compat/-/merge_requests/8

Bump semaphore-compat submodule to 2.0.0

Fixes #25087 and #27253

- - - - -
17be4f1f by Alan Zimmerman at 2026-05-26T04:54:52-04:00
EPA: Record semicolons in HsModifier

Ensure the semi colons are captured in the ParsedSource for code like

  %True;; %False;
  instance C D

It makes HsModifier (and hence HsModifierOf) LocatedA, so the semi
colons can be recorded as [TrailingAnn]

Also rename pprHsModifiers to pprLHsModifiers to match.

Closes #27294

- - - - -
8f991755 by fendor at 2026-05-26T11:02:52-04:00
Revert prog003 acceptance

We thought the commit 286f1adff3e78d775ff325caff71d0cee25d710b fixed the
test, but due to changes to ghci, modules loaded during the GHCi
session, the test was actually no longer testing what it set out to do,
"fixing" the broken test.

As modules are added to the `interactive-session` home unit, the object code needs
to be compiled with `-this-unit-id interactive-session`, otherwise the
object code won't be used.
Once this has been fixed in the test, the test fails as expected again.

- - - - -
277a3687 by mangoiv at 2026-05-26T11:03:40-04:00
libraries/process: bump submodule to v1.6.29.0

This submodule bump resolves a segfault on macos 15.
Fixes #27144

- - - - -
6779bb0c by mangoiv at 2026-05-26T11:03:40-04:00
libraries/unix: in submodule, don't pick branch 2.7

The 2.7 branch is outdated and the module has been advanced far beyond
it anyway, so remove that line.

- - - - -
4a645683 by Simon Peyton Jones at 2026-05-27T21:41:59-04:00
Trim the continuation in mkDupableContWithDmds

When there are no remaining argument demands, it means the application
is bottoming. In this case, we can trim the continuation to avoid the
panic that was observed in #27261.

See Note [Trimming the continuation for bottoming functions] in
GHC.Core.Opt.Simplify.Iteration.

- - - - -
8ab506ff by Cheng Shao at 2026-05-27T21:42:47-04:00
ghci: fix module name string lifetime in hs_hpc_module invocation

This patch makes hpcAddModule pass a properly malloced module name
string to hs_hpc_module, instead of using useAsCString which causes
use-after-free of module name string. Fixes #27297.

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

- - - - -
b0233814 by sheaf at 2026-05-27T21:43:31-04:00
Relax acceptance threshold for T10421

As seen in #27289, the 1% acceptance threshold for this text was
overly narrow, resulting in spurious test failures. This commit widens
the acceptance threshold to 2%. Fixes #27289.
- - - - -
63ce5770 by Luite Stegeman at 2026-05-28T12:23:35-04:00
Fixes for black holes

 - suspend duplicate work for eager black holes
 - detect eager black holes in checkBlockingQueues
 - don't overwrite existing black holes even if they're not
     in an eager blackhole frame
 - don't deadlock on self when thunk is already blackholed

Fixes #26936

- - - - -
037a80dc by Tom McLaughlin at 2026-05-28T12:24:36-04:00
Event/Windows.hsc: rethrow exceptions in overlapped IO

This prevents the WinIO manager from swallowing exceptions in overlapped IO. It
was added to make WinIO support possible in the `network` library. See
https://gitlab.haskell.org/ghc/ghc/-/issues/27283.

We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP.

- - - - -
2d53bcdb by Wolfgang Jeltsch at 2026-05-28T12:25:21-04:00
Allow `downsweep` to use nodes of an existing module graph

To this end, `downsweep` has not been able to use the nodes of a module
graph obtained from a previous downsweeping round. In some GHC API
applications, downsweeping is performed somewhat incrementally and
therefore could profit from reusing such existing results. This
contribution makes this possible.

Resolves #27054.

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

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

Closes #11226.

- - - - -
ed29a5e6 by Sven Tennie at 2026-05-28T17:30:36-04:00
Add optional config setting for LibDir (#19174)

Previously, the `libDir` was derived from `topDir`. This won't work for
inplace stage2 cross-compilers where binaries and libraries are in
different stage dirs (`_build/stage1/` for executables and
`_build/stage2` for libraries).

`LibDir` is set in the inplace `settings` files. For bindists, we
generate a new `settings` file with no `LibDir` entry. GHC then defaults
to use `topDir` as `libDir` again. This keeps the bindist relocatable.

If `LibDir` is a relative path, it is interpreted relatively to
`topDir`.

The global package db is part of the `lib/` folder. If we want to point
for inplace cross-compilers to the succeeding stage's folder, this is
done by setting `LibDir`. Thus, the global package db must be found
relative to `libDir`` (which may default to `topDir` or be set by
`LibDir`).

The complexity of settings becomes scary. So, add a test to ensure
`LibDir` works as expected.

- - - - -
8339cf8f by Sven Tennie at 2026-05-28T17:30:36-04:00
Add Haddock to FileSettings

Helping to understand the fields' meanings without deeper analyses.

- - - - -
4ce251e4 by Sylvain Henry at 2026-05-28T17:31:39-04:00
foundation test: skip signed minBound `quot` (-1) (#27222)

`minBound `quot` (-1)` for fixed-width signed integers is platform
dependent: the mathematical result -minBound is not representable in
the type. On x86, IDIV traps; LLVM's sdiv is undefined behaviour in
this case; on AArch64/RISC-V, SDIV wraps to minBound.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

- - - - -
b8ba7e61 by Simon Jakobi at 2026-05-28T17:32:23-04:00
Prevent dictionary-passing in checkTyEqRhs

...by pre-specializing it to TcM.

Previously, wherever checkTyEqRhs was used in other modules, the
Core showed dictionary passing ($fMonadIOEnv). The added SPECIALIZE
pragma prevents this.

- - - - -
d603477f by David Eichmann at 2026-05-29T13:17:12-04:00
Hadrian: create a ghc-internal .def file per ghc-internal dll

The .def file generated from rts/win32/libHSghc-internal.def.in contains
the name of the ghc-internal dll. The correct dll name differs based
on if the dll is inplace/final and if using the Dynamic way. Previously,
this was not accounted for and inconsistent dlls names where used. That
led to failure when loading dlls at runtime in experiments with windows
dynamic linking.

- - - - -
1fc21753 by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: copy backend interface haddocks to Native backend (#27305)

The haddock comments documenting the BigNat backend interface (function
contracts, expected MutableWordArray# sizes, return-value semantics, etc.)
were attached to the FFI backend module. Copy them to the Native backend
so they remain in tree once the FFI backend is removed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

- - - - -
717059df by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: remove FFI backend (#27305)

The FFI backend of ghc-bignum (now part of ghc-internal) had no known
users and is easy to recreate by relinking ghc-internal with a custom
backend. Remove the backend module, the bignum-ffi cabal flag, and the
ffi option from Hadrian's --bignum selector. The backend interface
documentation now lives in the Native backend module.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

- - - - -
4bb3b1d8 by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: remove Check backend (#27305)

The Check backend of ghc-bignum (now part of ghc-internal) compared the
selected backend's output against the Native backend for validation.
It had no known users. Remove the backend module, the bignum-check
cabal flag, the bignumCheck Hadrian flavour field, and the check-
prefix in Hadrian's --bignum selector.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

- - - - -
6b3044a0 by David Eichmann at 2026-05-30T11:58:48-04:00
Add code comments to allocator code

- - - - -
f4e04210 by Matthew Pickering at 2026-05-30T11:59:34-04:00
hadrian: Refactor system-cxx-std-lib rules

I noticed a few things wrong with the hadrian rules for
`system-cxx-std-lib` rules.

* For `text` there is an ad-hoc check to depend on `system-cxx-std-lib`
outside of `configurePackage`.
* The `system-cxx-std-lib` dependency is not read from cabal files.
* Recache is not called on the packge database after the `.conf` file is
generated, a more natural place for this rule is `registerRules`.

Treating this uniformly like other packages is complicated by it not
having any source code or a cabal file. However we can do a bit better
by reporting the dependency firstly in `PackageData` and then needing
the `.conf` file in the same place as every other package in
`configurePackage`.

This commit increases the `shakeVersion`, to provide backwards
compatibility to previous builds with different PackageData.

Fixes #25303

Co-authored-by: Sven Tennie <sven.tennie@gmail.com>

- - - - -
576987d0 by Simon Jakobi at 2026-06-02T04:53:36-04:00
compiler: use nubOrd from containers

Address #27103 by replacing GHC.Utils.Misc.ordNub[On] with
Data.Containers.ListUtils.nubOrd[On].

Note that nubOrd suffers from a small inefficiency, a fix for which
will be included in the next containers release:

  https://github.com/haskell/containers/issues/1202

- - - - -
deea53c3 by David Eichmann at 2026-06-02T04:54:22-04:00
Hadrian: disable response files for GHC/Haddock builders on non-Windows

This makes debugging build errors easier on non-windows hosts.
See issue #27230

- - - - -
f2f5c6ba by Nikita Efremov at 2026-06-02T16:04:54+00:00
fix typo : compete with performance, not complete
- - - - -
5524ea0e by Wolfgang Jeltsch at 2026-06-03T08:01:26-04:00
Make the current `base` buildable with GHC 9.14

This comprises the following changes:

  * Disable some imports into `GHC.Base` for GHC 9.14
  * Disable some imports into `Prelude` for GHC 9.14
  * Disable separate `ArrowLoop` import for GHC 9.14
  * Disable `GHC.Internal.STM` import for GHC 9.14
  * Disable `GHC.Internal.Unicode.Version` import for GHC 9.14
  * Disable `GHC.Internal.TH.Monad` import for GHC 9.14
  * Add alternative `fixIO` import for GHC 9.14
  * Add alternative `unsafeCodeCoerce` import for GHC 9.14
  * Disable hiding of imported SIMD operations for GHC 9.14
  * Disable use of GHC 9.14’s `printToHandleFinalizerExceptionHandler`
  * Enable use of `getFileHash` from `ghc-internal` for GHC 9.14
  * Make `thenA` available for GHC 9.14
  * Make `thenM` available for GHC 9.14
  * Disable translation of `IoManagerFlagPoll` for GHC 9.14
  * Add `hGetNewlineMode` for GHC 9.14

- - - - -
d3438055 by Enrico Maria De Angelis at 2026-06-03T08:02:17-04:00
Fix #27067 - Clarify haddocks on `minusNaturalMaybe`

- - - - -
f9bcfac2 by sheaf at 2026-06-03T14:47:19-04:00
Avoid mkTick in Core Prep breaking ANF

As discovered in #27182, mkTick can break ANF. This patch introduces a
variant of mkTick that skips the single optimisation that could break
ANF. This is preferrable over switching to the raw Tick constructor,
as the latter may introduce spurious cost centres in profiling reports.

This is a temporary measure until we more thoroughly refactor how
mkTick works (see #27141).

See Note [mkTick breaks ANF] in GHC.CoreToStg.Prep.

Fixes #27182

- - - - -
cf1fd661 by Artem Pelenitsyn at 2026-06-03T14:48:09-04:00
clarify comment for getSizeofMutableByteArray#: we get the size in bytes, not "elements"
- - - - -
a3b431f3 by David Eichmann at 2026-06-04T10:10:19+00:00
Hadrian: convert env variable ACLOCAL_PATH to unix paths.

Convert ACLOCAL_PATH to a unix style path when invoking autoreconf.
Autoreconf doesn't handle windows paths.
See Note [Autoreconf unix paths from ACLOCAL_PATH].

Fixes #27311

- - - - -
18f6138a by Simon Jakobi at 2026-06-04T20:20:31-04:00
testsuite: Deduplicate --only test names

config.only is assumed to be a set, but supplying --only overwrote it
with the (list) argparse result, which can contain duplicates. When a
test ran, config.only.remove(name) dropped only the first occurrence,
so a duplicated name lingered and was later misreported as a
"test not found" framework failure. Store it as a set instead.

Fixes #27322

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

- - - - -
2f3cc9ff by Simon Jakobi at 2026-06-08T07:55:49-04:00
testsuite: detect fast bignum via ghc-internal, not removed ghc-bignum

The ghc-bignum package was merged into ghc-internal, so the BIGNUM_GMP
probe in test.mk ran `ghc-pkg field ghc-bignum exposed-modules`, which
fails with "cannot find package ghc-bignum". That error went to stderr
and leaked into the captured stderr of every makefile_test, causing
spurious [bad stderr] failures across the suite. The probe also silently
returned empty, so config.have_fast_bignum was wrongly False even on GMP
builds.

Probe ghc-internal's extra-libraries for the gmp library instead: the
GMP backend module is an other-module (not exposed), but GMP_LIBS adds
gmp to extra-libraries only on a GMP build, so this distinguishes the
backends. Redirect stderr to keep any future missing-package error off
the harness's stderr.

This also removes a stale comment as per suggestion from hsyl20.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

- - - - -
eb3bf6e7 by Alan Zimmerman at 2026-06-08T07:56:32-04:00
EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas

This now matches what it actually does.

- - - - -
498bb21a by David Eichmann at 2026-06-09T18:02:39-04:00
Hadrian: avoid response files when command line is short enough

This replaces the logic of always using response files on Windows.
With the new condition based on command line lenght, reponse files
can be avoided in many more cases (on windows).

Now that response files are only used in a small number of cases,
response files are always kept and the -r / --keep-response-files
command line options have been removed

The response file paths are nolonger randomized. They are placed in the
`_build/rsp` directory. This ensures they are ignored by git and we
that Hadrian reuses response file paths when rebuilding rather than
leaving stale response files around.

Update user guide putting response files in its own section

- - - - -
87f510a5 by Simon Hengel at 2026-06-09T18:03:25-04:00
Don't use non-breaking spaces

- - - - -
41a19379 by David Eichmann at 2026-06-09T18:04:11-04:00
Hadrian: remove unused wrapper scripts from windows bindist

These wrapper scripts are only installed on non-relocatable builds
which are not generally supported on windows.

- - - - -
ce01ccb6 by sheaf at 2026-06-10T05:08:48-04:00
Don't drop ticks around variables of type `IO ()`

GHC.Core.Utils.mkTick is responsible for placing a tick on a Core
expression. It contains logic for dropping SCCs (non-counting profiling
ticks) around non-function variables, as such variables cannot
meaningfully contribute to profiles. However, the logic for what counts
as a function was incorrect: it used `isFunTy` which returns 'False' for
types such as 'IO ()' where the function arrow is hidden under a
newtype.

We now use 'mightBeFunTy' instead of 'isFunTy'. This ensures we don't
drop ticks in cases we aren't sure.

On the way, we improve the documentation of 'isFunTy', 'isPiTy' and
'mightBeFunTy', and update the latter's implementation to consistently
handle unary classes.

Fixes #27225

-------------------------
Metric Decrease:
    T5642
-------------------------

- - - - -
d311c4f1 by Simon Jakobi at 2026-06-10T05:09:32-04:00
testsuite: Add regression test for #4081

Check that a strict constructor field is unboxed once outside an
enclosing loop, not re-inspected each iteration (the float-out
case-floating from 9cb20b488). Uses simonpj's `data T a = T !a` example
from the ticket; T4081.stderr captures the expected Core.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

- - - - -
333df444 by sheaf at 2026-06-10T05:10:25-04:00
Check for cabal-install >= 3.12 upfront

Starting with commit 8cb99552f607f6bc4000e45ab32532d50c8bb996, Hadrian
requires cabal-install >= 3.12 in order to use the 'cabal path' command
that was introduced in version 3.12, as per
  https://github.com/haskell/cabal/blob/a51c4ee1556d816ad86e90db7e6330dd51b0b6...

This was not reflected in the Hadrian build script, causing a delayed
build failure instead of enforcing the version requirement upfront,
which this patch does.

Fixes #27317

- - - - -
98c20394 by sheaf at 2026-06-10T05:11:09-04:00
Fix crash in Data.Data instance for HsCtxt

The Data.Data instance for HsCtxt contained an error for the 'toConstr'
method, which could trigger for example when looking at -ddump-tc-ast
traces. Replace it with the 'abstractConstr' pattern used in the rest of
the codebase.

- - - - -
5ac9ce7d by Zubin Duggal at 2026-06-10T21:26:32+05:30
hadrian: Remove old package.conf files when generating new ones

Old package.conf files might exists with different hashes, causing issues like #26661

Fixes #26661

- - - - -
c9015f09 by sheaf at 2026-06-11T12:40:28-04:00
Fix AArch64 clobbering bug for MUL2

On AArch64, the code generator could clobber one of the input operands
when computing the lower bits of a MUL2 operation. This rendered invalid
the subsequent computation of the high bits.
This commit fixes that by using a temporary register. The register
allocator can remove the redundant move in the common case when the
registers do not conflict.

Fixes #27046

- - - - -
7ab90288 by Rodrigo Mesquita at 2026-06-11T12:41:11-04:00
fix: make T27131 less flaky

It seems that T27131 fails flakily in a race where we check the flag
before the capability had the chance to process the mailbox which sets
the flag. This seemingly should only happen if the capability ends up
being the same for setting and checking the flag.

- - - - -
8965cb76 by Marc Scholten at 2026-06-12T04:53:22-04:00
haddock: render modules concurrently

- - - - -
8cc0b64a by Duncan Coutts at 2026-06-12T04:54:06-04:00
Promote HAVE_PREEMPTION from Timer.c to OSThreads.h

We will want to know about HAVE_PREEMPTION in more places.

HAVE_PREEMPTION tells us that we do have OS threads available,
irrespective of whether THREADED is defined. In particular,
HAVE_PREEMPTION is defined on all proper OSs, but not on WASM (and
hyopthetically may not be true on some other platforms like
micro-controllers, RTOSs, VM hypervisors etc).

- - - - -
cce574ed by Duncan Coutts at 2026-06-12T04:54:06-04:00
Define ACQUIRE_LOCK_ALWAYS and friends

Fix issue #27335

Like the atomic _ALWAYS variants, these lock actions are always defined,
rather than being dependent on whether we are in the THREADED case. All
the "normal" LOCK macros are defined to be no-ops when !THREADED.

The use case for the _ALWAYS variants is where we are using OS threads
even in the non-threaded RTS. This includes everything to do with the
timer/ticker thread, which is used in the non-threaded RTS too.

In particular, we will want to use this for eventlog things, because the
timer thread performs eventlogging concurrently with the main
capability, even in the non-threaded RTS.

- - - - -
1f28d1f6 by Duncan Coutts at 2026-06-12T04:54:06-04:00
Use ACQUIRE/RELEASE_LOCK_ALWAYS with eventBufMutex

Even in the non-threaded RTS the eventBufMutex is needed by both the
main capability and the timer/ticker thread, so always use the mutex.

This should fix #25165 which is about the main capability and the timer
thread posting events to the eventlog buffer concurrently and thereby
corrupting the buffer data.

- - - - -
0ff29782 by Duncan Coutts at 2026-06-12T04:54:06-04:00
Expose eventBufMutex in the EventLog interface/header

We will need it in forkProcess to ensure we don't write to the global
eventlog buffer concurrently with trying to flush eventlog buffers and
do the fork().

- - - - -
7a688395 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Split flushAllCapsEventsBufs into safe and unlocked version

Following the convention that unlocked versions have a trailing _
underscore in their name. This one requires the caller to hold the
eventlog global buffer mutex. We will need this in forkProcess.

- - - - -
341ed474 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Remove redundant use of stopTimer in setNumCapabilities

Historically, the comment here was:

  We must stop the interval timer while we are changing the
  capabilities array lest handle_tick may try to context switch
  an old capability. See #17289.

and

  We must disable the timer while we do this since the tick handler may
  call contextSwitchAllCapabilities, which may see the capabilities array
  as we free it.

What this refers to is that historically, when changing the number of
capabilities, the array of capabilities was reallocated to a new size,
allocating new ones and freeing the old ones, thus invalidating all
existing capbility pointers.

Strangely, for good measure the code used to call stopTimer twice (hence
the two similar comments above).

However, since commit a3eccf06292dd666b24606251a52da2b466a9612, the
capabilities array is no longer reallocated. Instead the array is
allcoated once on RTS startup to the maximum size it could ever be
allowed to be, and then capabilities get enabled/disabled at runtime. So
the capability pointers never become invalid anymore. At worst, they may
point to capabilities that are disabled.

Thus we no longer need to stop the timer (twice) while we change the
number of enabled capabilities. This also partially solves issue #27105,
which notes that stopTimer is being used as if it were synchronous, when
it is not. At least for this case, the solution is that stopTimer is not
needed at all!

- - - - -
674858e3 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Remove redundant use of stopTimer in forkProcess

but replace it with taking the eventlog buffer lock during the fork.

Fixes issue #27105

The original reason to block the timer during a fork was that
historically the timer was implemented using a periodic timer signal,
and the signal itself would interrupt the fork system call (returning
EINTR). For large processes (where fork() takes a while) this could
permanently livelock: the timer always would go off before the fork
could complete, which got retried in a loop forever.

The timer is no longer implemented as a unix signal, but uses threads.
Thus the original problem no longer exists. The only remaining reason to
block the timer tick is to prevent actions taken by the tick from
interfering with the delicate process involved in fork (taking a load of
locks and pausing everything).

The only thing we need to do is to prevent the eventlog from being
written to or flushed while the fork is taking place. To achieve this
all we need to do is hold the mutex for the global eventlog buffer.

This removes the last use of stopTimer that expects stopTimer to work
synchronously (which it was not) and thus solves issue #27105. To be
clear, we solve issue #27105 not by making stopTimer synchronous, but by
eliminating the use sites that expected it to be synchronous.

- - - - -
40764930 by sheaf at 2026-06-12T14:54:43-04:00
Add type family performance test for #26426

Some GHC versions produced large numbers of coercions after typechecking
and desugaring when compiling the program in #26426:

Version | Typechecker time | Typechecker allocations | Coercions
-------:|-----------------:|------------------------:|---------:
9.6     |   47 ms          |  48 MB                  |    110k
9.8     | 1000 ms          | 486 MB                  | 10,437k
9.10    |  922 ms          | 489 MB                  | 10,436k
9.12    |  906 ms          | 482 MB                  | 10,437k
9.14    |   63 ms          |  55 MB                  |    333k
10.0    |   47 ms          |  64 MB                  |     35k

The improvement 9.12 -> 9.14 was due to commit 22d11fa818fae2c95c494fc0fac1f8cb4c6e7cb6,
while the improvement 9.14 -> 10.0 was due to commit 0b7df6db9e46df40e86fbff1a66dc10440b99db5.

As the behaviour of GHC seems better than it's ever been on this program,
we declare victory, adding this performance test to ensure we don't
regress on this program.

On the way, we update Note [Combining equalities] in GHC.Tc.SolveR.Equality
with the explanation of the 9.12 -> 9.14 improvement (getting rid of an
exponential blowup in coercion sizes), and we update
Note [Exploiting closed type families] in GHC.Tc.Solver.FunDeps with
the explanation of the 9.14 -> 10.0 improvement (bringing down coercion
size growth from cubic to quadratic).

- - - - -
0f3d0a71 by Zubin Duggal at 2026-06-12T14:55:30-04:00
compiler: mark tool messages as errors/warnings depending on the exit code

Fixes #27370

- - - - -
d9ea2d76 by mangoiv at 2026-06-13T04:41:51-04:00
libraries/process: bump submodule to v1.6.30.0

- bump the submodule to the appropriate tag
- suppress benign warning resulting from the change

- - - - -
6ebaaba3 by David Eichmann at 2026-06-13T04:42:37-04:00
ghc-toolchain: don't throw when candidate executables are not found

Fixes #27369

- - - - -
6c65e1e1 by David Eichmann at 2026-06-13T04:43:23-04:00
CI: lint-changelog checks for no-changelog label in script instead of rules

- - - - -
bab37cc6 by konsumlamm at 2026-06-13T19:10:21+02:00
Implement CLC proposal #378

Add `Data.Double` and `Data.Float` modules
Document that GHC uses IEEE 754

- - - - -
fb5246ad by fendor at 2026-06-15T18:07:23-04:00
Drop `preloadClosure` from `UnitState`

It is always hard-coded to the same value.

Backpack Unit instantiation isn't using it any more.
Allows us to simplify the API and get rid of `improveUnit`.

- - - - -
291ce3aa by ARATA Mizuki at 2026-06-15T18:08:26-04:00
RISC-V NCG: Zero-extend the result of castFloatToWord32

According to the ISA manual, FMV.X.W sign-extends the result.
We need to truncate the result to avoid creating an exotic Word32 value.

Fixes #27300

- - - - -
011be91f by ARATA Mizuki at 2026-06-15T18:08:26-04:00
RISC-V NCG: Treat d28-d31 (ft8-ft11) as caller-saved

According to the calling convention, the registers d28-d31 (ft8-ft11) are caller-saved.

Fixes #27306

- - - - -
e8a54713 by ARATA Mizuki at 2026-06-15T18:08:26-04:00
RISC-V NCG: Set rounding mode when emitting `truncate`

If we omit the rounding mode for `fcvt`, `dyn` will be used.
We do not want that for `truncate`, so we set `rtz`.
In other places, we set `rne` because we do not use the dynamic rounding mode.

Fixes #27303

- - - - -
9438bec7 by Zubin Duggal at 2026-06-15T18:09:11-04:00
rts: fix validate build with gcc 16. `__attribute__((regparm(1)))` is ignored on x86_64 and now
gcc warns that it is ignored:

rts/sm/Evac.h:35:1: error:
     error: ‘regparm’ attribute ignored [-Werror=attributes]

See https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ccead81bbc39668376eb5cf47066ac...

Fixes #27366

- - - - -
893e6133 by Andrew Lelechenko at 2026-06-15T23:55:36+01:00
base: more NonEmpty zips

CLC proposal: https://github.com/haskell/core-libraries-committee/issues/409

- - - - -
1314f2fd by David Eichmann at 2026-06-16T05:46:52-04:00
Hadrian: fix ghc-internal .def file name

- - - - -
7f72bcb3 by mangoiv at 2026-06-16T05:47:39-04:00
compiler: ignore camelCase and Eta reduce hlint hints

These do not cohere with the style used in GHC. After disabling them,
hlint lints are much less noisy again.

- - - - -
842bef9f by Alan Zimmerman at 2026-06-16T05:48:25-04:00
EPA: Use standard type family declaration for Anno

- - - - -
f6d30767 by Wolfgang Jeltsch at 2026-06-16T15:32:34-04:00
Fix two issues in the documentation of pipeline interruption

One issue is a typo (“interreuptible”), the other one the lack of an end
of a sentence, which has been reconstructed from the message of
633bbc1fd4762a2bb73ba1c5b9e0c279f1dd3c40, the commit that introduced
said documentation.

- - - - -
a3fa10e0 by Christian Georgii at 2026-06-16T15:33:26-04:00
Find plugins in sibling home units in multiple-home-unit sessions

In a multiple-home-unit session (e.g. `cabal repl --enable-multi-repl` or HLS), enabling a plugin with -fplugin that is defined in (or reexported by) another home unit failed with a "hidden package" error. The plugin module finder only searched the current home unit and the registered external packages, never the sibling home units.

findPluginModuleNoHsc now searches the home units that the current home unit depends on, following module reexports and respecting hidden modules, exactly as ordinary import resolution does in findImportedModuleNoHsc. To avoid two divergent copies of this logic, the shared home-unit search (the current home unit first, then its dependencies in priority order, with the accompanying ordering invariant) is extracted into findHomeModuleAmongDeps, which both findImportedModuleNoHsc and findPluginModuleNoHsc now call.

Add testsuite/tests/driver/multipleHomeUnits/plugin01, which loads a plugin as byte-code from a sibling home unit, and plugin02, in which the consumer enables a plugin reexported by a sibling home unit without depending on the plugin's own home unit directly.

Fixes #27349

- - - - -
d216412b by Ian-Woo Kim at 2026-06-16T20:25:57-04:00
Make the order of usages deterministic

It has been observed that the ordering of usages can be non-determinstic
in parallel builds. Therefore, this contribution introduces sorting of
usages based on a platform- and race-independent sorting criterion.

Resolves #26877.

Co-authored-by: Wolfgang Jeltsch <wolfgang@well-typed.com>

- - - - -
8e1cc105 by Wolfgang Jeltsch at 2026-06-16T20:25:57-04:00
Change the descriptions of two existing changelog entries

The descriptions now describe the changes in a user-friendly manner, as
opposed to describing the contributions that led to these changes in a
developer-friendly manner.

- - - - -
636c1c7a by Ian Duncan at 2026-06-16T20:26:50-04:00
AArch64: use SXTH, not SXTW, for W32 signExtendReg

signExtendReg was using SXTH (sign-extend halfword, 16-bit) for
W32-to-W64 sign extension. This should be SXTW (sign-extend word,
32-bit). SXTH only sign-extends the lower 16 bits, producing wrong
results for 32-bit values whose bit 15 differs from bit 31.

Other fixes:

  - At sub-W64, code gen for MO_S_Mul2 should use W32 registers for
    SMULL source operands as per the ARM spec (SMULL Xd, Wn, Wm),
    and not W64.

  - Ensure signExtendReg uses the source width for the source operand
    in SXTW/SXTH/SXTB instructions. GNU as requires sxtw Xd,Wn (not
    sxtw Xd,Xn), while LLVM's integrated assembler on macOS is lenient.

  - Fix overflow flag computation for `MO_S_Mul2`. The overflow bit
    was exactly inverted for sub-W64 operands.

Fixes #26978 and #27047

- - - - -
b734c75d by Igor Ranieri at 2026-06-16T20:27:32-04:00
haddock: Update CONTRIBUTING with missing step, add missing test
dependency

- - - - -
7fe4f2ec by Luite Stegeman at 2026-06-17T05:35:09-04:00
tag inference: don't confuse functions with their return values

inferTagRhs was mixing up taggedness for closures and return values
for function closures. We really shouldn't assign TagTuple to a
properly tagged function returning a tuple.

We fix this by keeping track of functions (TagFun) separately from
values (TagVal) and keeping track of their return value. TagFun is
also used for join points.

fixes #27005

- - - - -
4671c126 by Sebastian Graf at 2026-06-17T05:35:55-04:00
Seed the simplifier's in-scope set for open expressions

simplifyExpr simplifies expressions typed at the GHCi prompt and the
results of Template Haskell splices. Such an expression may be open: at a
GHCi debugger breakpoint its free variables include RuntimeUnk skolems
standing for as-yet-unknown types.

The simplifier began with an in-scope set holding only the wildcard
binder, so when it instantiated the unsafeCoerce# wrapper that GHCi
builds around a result, it formed a substitution whose range mentioned a
free skolem that was not in scope. That breaks the substitution invariant
and, in a compiler built with assertions, trips substTy's sanity check.

Seed the initial in-scope set with the free variables of the expression.
For a closed expression this adds nothing.

See Note [Seed the in-scope set for open expressions].

Fixes #17833 and its duplicate #21118.

- - - - -
67d41299 by Sebastian Graf at 2026-06-18T05:18:24-04:00
Desugar a `case` scrutinee only once (#27383, #20251)

In `dsExpr` for `HsCase` we desugared the scrutinee /twice/: once to
build the Core `case` itself, and again inside `matchWrapper`, which
re-desugared the source scrutinee (via `addHsScrutTmCs`) purely to
record long-distance information for the pattern-match checker.

For a single `case` that is merely wasteful.  But for nested cases it
is catastrophic.  Consider

    case (case (case e of ... ) of ... ) of ...

Desugaring the outer scrutinee desugars the middle `case` twice, each
of which desugars the inner `case` twice, and so on.  The work doubles
at every level, so desugaring takes O(2^n) time in the nesting depth.
That is the blowup reported in #27383; it is also what makes the
machine-generated program in #20251 take an age to compile.

The fix is simple.  `matchWrapper` is handed the scrutinee anyway, so
we give it the Core expression we have /already/ desugared, and record
the long-distance term constraint with `addCoreScrutTmCs` instead of
re-desugaring from source.  This is just what `matchSinglePatVar`
already does for single-pattern matches.

So:

* `matchWrapper` now takes `Maybe [CoreExpr]` rather than
  `Maybe [LHsExpr GhcTc]`.

* The `HsCase` equation of `dsExpr` passes the already-desugared
  `core_discrim`; the arrow desugarer passes its match variables.

* `addHsScrutTmCs` had no other use, so it is gone.

Desugaring is now linear in the nesting depth.  (The coverage checker
still runs `simpleOptExpr` over each scrutinee, which leaves the total
at O(n^2); that is ample.)  The long-distance information itself is
unchanged: the checker sees precisely the Core that backs the
generated code.

Test: deSugar/should_compile/T27383

- - - - -
fa5defde by Rodrigo Mesquita at 2026-06-18T05:19:11-04:00
fix: Save FastStrings in the PMC

There is no point in adding the unique to the occurrence FastString we
create, since it is part of the Id anyway.

Adding it to the FastString, meant each FastString was unique
unnecessarily!

In a separate branch, running the compiler on test `InstanceMatching`
observed 30000 `FastString`s created by this code path.

Plus, `fsLit "pm"` follows the existing pattern in `mkPmId`.

- - - - -
4efb4a66 by Alan Zimmerman at 2026-06-18T14:41:14-04:00
TTG: Add extension points to HsConDetails

Extend HsConDetails as

    data HsConDetails p arg rec
      = PrefixCon !(XPrefixCon p) [arg]    -- C @t1 @t2 p1 p2 p3
      | RecCon    !(XRecCon p)    rec      -- C { x = p1, y = p2 }
      | InfixCon  !(XInfixCon p)  arg arg  -- p1 `C` p2
      | XHsConDetails !(XXHsConDetails p)

    type family XPrefixCon      p
    type family XRecCon         p
    type family XInfixCon       p
    type family XXHsConDetails  p

- - - - -
c8d27dd4 by Simon Jakobi at 2026-06-18T14:41:59-04:00
CI: quiet submodule clean output in after_script and setup

The clean and cleanup_submodules functions ran 'git submodule foreach
git clean -xdf', flooding the job log with 'Entering ...' and
'Removing ...' lines. Pass --quiet to 'git submodule' and -q to 'git
clean' to drop the success output; errors are still reported.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

- - - - -
09326ca6 by Matthew Pickering at 2026-06-20T23:41:12+02:00
Add missing req_interp modifier to T18441fail3 and T18441fail19

These tests require the interpreter but they were failing in a different
way with the javascript backend because the interpreter was disabled and
stderr is ignored by the test.

- - - - -
521e55bf by Matthew Pickering at 2026-06-20T23:41:13+02:00
hadrian: Fill in more of the default.host toolchain file

When you are building a cross compiler this file will be used to build
stage1 and it's libraries, so we need enough information here to work
accurately. There is still more work to be done (see for example, word
size is still fixed).

- - - - -
23c9b6c3 by Matthew Pickering at 2026-06-20T23:42:52+02:00
hadrian: Build stage 2 cross compilers

* Most of hadrian is abstracted over the stage in order to remove the
  assumption that the target of all stages is the same platform. This
  allows the RTS to be built for two different targets for example.
* Abstracts the bindist creation logic to allow building either normal
  or cross bindists. Normal bindists use stage 1 libraries and a stage 2
  compiler. Cross bindists use stage 2 libararies and a stage 2
  compiler.
* hadrian: Make binary-dist-dir the default build target. This allows us
  to have the logic in one place about which libraries/stages to build
  with cross compilers. Fixes #24192

New hadrian target:

* `binary-dist-dir-cross`: Build a cross compiler bindist (compiler =
  stage 1, libraries = stage 2)

This commit also contains various changes to make stage2 compilers
feasible.

-------------------------
Metric Decrease:
    LinkableUsage02
    ManyAlternatives
    ManyConstructors
    MultiComponentModulesRecomp
    MultiLayerModulesRecomp
    RecordUpdPerf
    T10421
    T12150
    T12227
    T12425
    T12707
    T13035
    T13379
    T13820
    T15703
    T16577
    T18140
    T18282
    T18698a
    T18698b
    T18923
    T1969
    T20049
    T21839c
    T3294
    T4801
    T5030
    T5321FD
    T5321Fun
    T5631
    T5642
    T6048
    T783
    T9020
    T9198
    T9233
    T9630
    T9872d
    T9961
    parsing001
    T3064

Metric Increase:
    T26989
    hard_hole_fits
-------------------------

Co-authored-by: Sven Tennie <sven.tennie@gmail.com>

- - - - -
26fed8ab by Matthew Pickering at 2026-06-20T23:42:52+02:00
ci: Test cross bindists

We remove the special logic for testing in-tree cross
compilers and instead test cross compiler bindists, like we do for all
other platforms.

- - - - -
80c8910e by Matthew Pickering at 2026-06-20T23:42:52+02:00
ci: Introduce CROSS_STAGE variable

In preparation for building and testing stage3 bindists we introduce the
CROSS_STAGE variable which is used by a CI job to determine what kind of
bindist the CI job should produce.

At the moment we are only using CROSS_STAGE=2 but in the future we will
have some jobs which set CROSS_STAGE=3 to produce native bindists for a
target, but produced by a cross compiler, which can be tested on by
another CI job on the native platform.

CROSS_STAGE=2: Build a normal cross compiler bindist
CROSS_STAGE=3: Build a stage 3 bindist, one which is a native compiler and library for the target

- - - - -
8215573d by Sven Tennie at 2026-06-20T23:42:52+02:00
ci: Increase timeout for emulators

Test runs with emulators naturally take longer than on native machines.

Generate jobs.yml

- - - - -
5acb7dbc by Matthew Pickering at 2026-06-20T23:42:52+02:00
ci: Javascript don't set CROSS_EMULATOR

There is no CROSS_EMULATOR needed to run javascript binaries, so we
don't set the CROSS_EMULATOR to some dummy value.

- - - - -
48345343 by Sven Tennie at 2026-06-20T23:42:52+02:00
Javascript skip T23697

See #22355 about how HSC2HS and the Javascript target don't play well
together.

- - - - -
5e44fd05 by Sven Tennie at 2026-06-20T23:42:52+02:00
Mark T24602 as fragile

It was skipped before (due to CROSS_EMULATOR being set, which changed
for JS), so we don't make things worse by marking it as fragile.

- - - - -
ab349ec2 by Sven Tennie at 2026-06-20T23:42:52+02:00
Fix T22744 for GHCJS

In fact, this test needs Template Haskell, not necessarily an
interpreter.

- - - - -
c73352d8 by Sven Tennie at 2026-06-20T23:42:52+02:00
haddock-test: fix GHCJS haddock test failures

Add --ghc-pkg-path flag support so haddock test runner can find
cross-prefixed ghc-pkg (e.g. javascript-unknown-ghcjs-ghc-pkg) which
is not on $PATH in cross install directories.

Skip haddockHtmlTest on GHCJS: Threaded.hs uses forkOS in a TH splice,
which GHCJS RTS doesn't support. Mark with js_skip in all.T.

- - - - -
5e814e76 by Andreas Klebinger at 2026-06-22T23:00:24-04:00
compiler: Deduplicate hscTidy

This function was accidentally duplicated during a refactor.

Fixes #27351

- - - - -
473b97eb by sheaf at 2026-06-22T23:01:22-04:00
Avoid mkTick in Core Prep breaking ANF (part II)

Hotfix for 2f9579765f55b3920ceb2e04995ff41a9d0e2d4e fixing a small
oversight in the call to tickTickedExpr from mkTick, in which we
improperly recursively called mkTick without passing on the preserve_anf
flag.

Fixes #27386

- - - - -
9284a1f7 by Simon Hengel at 2026-06-23T05:55:33-04:00
Don't use global variables to address concurrency bugs! (fixes #27234)

This was originally introduce with
88f38b03025386f0f1e8f5861eed67d80495168a to address #17922.

In this specific case a better fix would have been to synchronize on
stderr:

    withHandle_ "stderrSupportsAnsiColors" stderr $ \ _ -> do
      ...

But apparently the dependency on `terminfo` was removed in
32ab07bf3d6ce45e8ea5b55e8095174a6b42a7f0, preventing #17922 in the first
place.

- - - - -
44309cd3 by Alan Zimmerman at 2026-06-23T05:56:20-04:00
EPA: remove LocatedL / SrcSpanAnnL and  LocatedLI / SrcSpanAnnLI

This is part of a refactor towards only having LocatedA / SrcSpanAnnA

It removes the stated items, but has to add back one for BooleanFormula,
LocatedBF / SrcSpanAnnBF

This commit also use the HsConDetails RecCon extension point to
capture the braces in a record constructor

- - - - -
2f6a5534 by Simon Jakobi at 2026-06-23T15:46:20+02:00
Add -dstable-core-dump-order for stable Core dump ordering (#27296)

The order of top-level bindings in Core dumps (-ddump-simpl etc.) is the
compiler's Unique-sensitive internal processing order, so an unrelated
upstream change can reorder them and defeat a textual diff of two dumps.

This adds an opt-in flag -dstable-core-dump-order that reorders the
top-level bindings of dumps routed through dumpPassResult into a stable,
Unique-independent order, so two dumps line up across rebuilds. See
Note [Stable Core dump order] in GHC.Core.Ppr for the sort key and its
rationale.

Adds tests T27296 (binders GHC emits in non-source order by default,
asserted to come out stably ordered under the flag) and T27296b (an
untidied -ddump-float-out dump pinning the ordering of the anonymous lvl
floats by literal value).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

- - - - -
141986e3 by mangoiv at 2026-06-24T15:51:14-04:00
compiler: refactor error reporting code for ExplicitLevelImports

Refactors error reporting code for ExplicitLevelImports to pass in a
RdrName and a GlobalReaderElt to be able to report errors that are
faithful to the source and to more precisely distinguish between names
that are in scope from different qualifications.

Fixes #27385 and #26616

- - - - -
aa7df6b6 by Simon Hengel at 2026-06-24T15:52:18-04:00
Set GHC_VERSION when calling custom pre-processors (see #25952)

(so that pre-processors can emit backwards compatible code)

- - - - -
a9e494f2 by Simon Hengel at 2026-06-24T15:54:08-04:00
Add a flag to control GHCi specific error hints (close #27409)

- - - - -
a805b2a2 by Simon Hengel at 2026-06-24T15:55:20-04:00
Reference correct package in error messages for reexported modules

(fixes #27417)

- - - - -
f235d183 by Simon Jakobi at 2026-06-25T05:51:18-04:00
Add explicit setBit/clearBit/complementBit for instance Bits Integer (#21176)

The default setBit, clearBit, and complementBit methods allocate
intermediate Integers per call. Define them explicitly via the new
integerSetBit[#], integerClearBit[#] and integerComplementBit[#], built
on the BigNat# primitives, which avoid those allocations. Allocation is not
eliminated entirely -- the negative (IN) cases would need in-place mutation,
which is left as future work.

The default methods constant-folded on literal arguments via the
integerOr/integerAnd/integerXor rules, which fold literal Integers of any
size. The explicit functions have no such rule, so they (their Word-argument
wrappers, and the Bits Integer methods) are marked INLINE to expose the
underlying primops to the simplifier; see Note [INLINE for constant folding
of bit operations]. This restores folding only on the small-int (IS) path --
large literal Integers (IP/IN) are no longer constant-folded, a minor
regression for that case. T8832 covers the IS-path folding.

The new golden-output test T21176 checks all three operations against the
default implementations across the sign/size boundaries, recording each
result plus its integerCheck validity. The base and ghc-bignum interface-
stability export goldens gain the new functions.

The main changelog entry lives in changelog.d under a new ghc-internal
section (renamed from ghc-prim).

CLC proposal: https://github.com/haskell/core-libraries-committee/issues/423

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

- - - - -
202ed264 by Marc Scholten at 2026-06-25T05:52:21-04:00
haddock: use Text in documentation pipeline

This patch moves Haddock's documentation pipeline from String to Text
where the data is already textual. It avoids repeated conversions while
keeping the existing decoding behavior for invalid UTF-8 docstring
chunks.

The main changes are:

* Render and carry docstrings as Text in Haddock-facing paths.
* Use the Binary Text instance from GHC.Utils.Binary for Haddock
  interface files, and bump the Haddock binary interface version.
* Add a FastString HTML instance so XHTML rendering avoids
  intermediate String allocation.
* Keep HsDocStringChunk decoding lenient, matching the previous
  unpackHDSC behavior on invalid UTF-8 input.
* Update the xhtml submodule to 3000.4.1.0, which contains the
  apostrophe escaping fix used by the Haddock test output.

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Assisted-by: Codex <codex@openai.com>

- - - - -
a72ff58f by mangoiv at 2026-06-25T05:53:07-04:00
compiler: rename ZonkAny to UnusedType and add pretty printing logic

ZonkAny is a hard to understand name for users who do not know how the
compiler works internally. Additionally, it is confusing that ZonkAny,
while being a concrete type *represents* a meta variable, espeically in
the compiler output.
This patch changes the name of ZonkAny to UnusedType which is closer to
its intended semantics and adds special pretty printing logic to display
this type in the same fashion the compiler displays meta variables in
other places, whenever they leak from the implementation to the user.
It also exports the type from ghc-internal:GHC.Internal.Types in order
to expose documentation.

Fixes #27390

Co-Authored-By: Sam Derbyshire <sam.derbyshire@gmail.com>

- - - - -
6813f002 by Simon Jakobi at 2026-06-26T04:51:47-04:00
Reg.Linear: drop Platform argument from most FR (FreeRegs) methods

The FR class has one instance per CPU architecture, so any
architecture-constant information its methods derived from the Platform
argument can instead be baked into the instance. This removes the now
needless Platform argument from frAllocateReg, frGetFreeRegs and
frReleaseReg.

frInitFreeRegs keeps its Platform argument: the initial allocatable set is
genuinely platform-dependent, see Note [Aarch64 Register x18 at Darwin and
Windows].

Fixes #26665

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

- - - - -
3b2a9409 by Zubin Duggal at 2026-06-26T04:52:39-04:00
testsuite: Report fragile failures as skipped in JUnit output

- - - - -
27463426 by Rodrigo Mesquita at 2026-06-26T20:54:58-04:00
perf: Share Module in Iface Symbol Table

This commit modifies the structure of the serialized `SymbolTable Name`
to then re-use and share the `Module` (both on disk and in memory) across
all `Name`s from the same module.

The new structure looks like:

  <total name count>
  $modules.size
  for (mod, names) in $modules:
    $mod
    $names.size
    for table_ix, occ in $names
      $table_ix
      $occ

i.e. we put the module just once, followed by all names in that module.
When deserializing, we deserialize the module just once, and all the
following `Name`s are constructed with a pointer to that same decoded
`Module`.

In `hoogle-test`, we must use `DNameEnv` rather than `Map Name`,
otherwise the output fixities order was susceptible to changes in the
uniques assigned to each Names, which is not stable.

Fixes #27401

-------------------------
Metric Decrease:
    InstanceMatching
    LinkableUsage01
    LinkableUsage02
    hard_hole_fits
-------------------------

- - - - -
412f1675 by Simon Hengel at 2026-06-26T20:55:41-04:00
Rename `MCDiagnostic` to `InternalMCDiagnostic`

`MCDiagnostic` is meant to be used for compiler diagnostics.

Any code that creates `MCDiagnostic` directly, without going through
`GHC.Driver.Errors.printMessage`, sidesteps `-fdiagnostics-as-json` (see
e.g. !14616, !14475, !14492 !14548).

To avoid this in the future, this change more narrowly controls who
creates `MCDiagnostic` (see #24113).

- - - - -
6f212121 by Facundo Domínguez at 2026-06-26T20:56:27-04:00
Encapsulate options of occurAnalysePgm in a record

- - - - -
adfbb179 by Facundo Domínguez at 2026-06-26T20:56:27-04:00
Allow to configure the occurrence analyser to retain some dead bindings

This is needed by plugins that are the only consumers of a binding which
is otherwise unused in the program.

See Note [Controlling elimination of dead bindings in occurrence analysis]
added in this commit, or
https://gitlab.haskell.org/ghc/ghc/-/issues/27240 for more discussion.

- - - - -
c745b11f by Copilot at 2026-06-26T20:56:27-04:00
Address documentation feedback

- - - - -
2c2a4a2a by Copilot at 2026-06-26T20:56:27-04:00
Keep the imp_rules parameter of occurPgmAnalysePgm and add occ_opts to OccEnv

- - - - -
e2262b0e by Copilot at 2026-06-26T20:56:27-04:00
Strengthen T27240.hs with a binding that should be removed

- - - - -
5f9d9268 by Copilot at 2026-06-26T20:56:27-04:00
Move the reference #27240 to a related paragraph

- - - - -
d86d2644 by Simon Hengel at 2026-06-26T20:57:10-04:00
Remove deprecated flag `-ddump-json` (see #24113)

This was first deprecated in 9.10.1.

- - - - -
3b15ff03 by Simon Jakobi at 2026-06-27T18:48:34+02:00
Tweak mk_mod_usage_info

* Use O(log n) `elemModuleEnv` instead of O(n) `elem` to filter the
  direct imports.
* Use `nonDetModuleEnvKeys` to avoid sorting the ent_map keys twice.
* Prepend the presumably shorter list when creating all_mods with
  `(++)`. Actually this eliminates the `(++)` entirely, as it seems to
  fuse with the `filter` expression.

As a result there is a tiny speed-up when generating the .hi-files for
modules with many imports.

None of the changes affect compilation determinism as the module list
is explicitly sorted to ensure a canonical order.

- - - - -
2d0fd154 by Alan Zimmerman at 2026-06-29T11:44:00-04:00
EPA: Remove LocatedC / SrcSpanAnnC

This is part of a cleanup of the zoo of
SrcSpanAnnXXX types for exact print annotations.

This one removes SrcSpanAnnC used for storing exact print annotations
for contexts. It replaces it with an explicit `HsContext` data type
that carries the annotations and the context.

So, replace

  type HsContext pass = [LHsType pass]

with

  type HsContext pass = HsContextDetails pass (LHsType pass)

  data HsContextDetails pass arg
    = HsContext
      { hsc_ext  :: !(XHsContext pass)
      , hsc_ctxt :: [arg]
      }
    | XHsContextDetails !(XXHsContextDetails pass)

We need the parameterised HsContextDetails because it is used both for
HsQual carrying 'LHsExpr p' and "normal" contexts carrying 'LHsType p'.

- - - - -
cca0d589 by Luite Stegeman at 2026-06-30T13:33:40-04:00
rts: handle large AP closures in compacting GC

The function update_fwd_large in the compacting GC could run into
an unexpected object with the following error:

  internal error: update_fwd_large: unknown/strange object  24

Closure type 24 is the AP closure, which was not handled in
upd_fwd_large. This patch adds handling them.

fixes #27434

- - - - -
42935858 by Luite Stegeman at 2026-06-30T13:33:40-04:00
testsuite: use compacting_gc way instead of hardcoding +RTS -c

- - - - -
bf7b5ce6 by Alan Zimmerman at 2026-06-30T13:34:23-04:00
EPA: Remove LocatedLW from LStmtLR

HsDo already had its XDo extension point for an
AnnList, which also appeared in LocatedLW.
So we remove the redundant one and use the one inside HsDo
as originally intended.

Also delete LocatedLC/LocatedLS as they were unused

- - - - -
d7cfea49 by Recursion Ninja at 2026-06-30T21:37:12-04:00
Decoupling 'L.H.S' from 'GHC.Types.SourceText'

  * Migrated 'IntegralLit'   to 'L.H.S.Lit'.
  * Migrated 'FractionalLit' to 'L.H.S.Lit'.
  * Migrated 'StringLiteral' to 'L.H.S.Lit'.
  * Added TTG extension points to the types above.
  * Added nice export list to 'GHC.Hs.Lit'.
  * Added 'rnOverLitVal' and 'tcOverLitVal' functions to 'GHC.Hs.Lit'.
  * Added instance 'Anno (StringLiteral (GhcPass p)) = SrcSpanAnnN'
  * Moved [Notes] about 'SourceText' from 'L.H.S.*' to 'GHC.*'.
  * Removed all references to 'SourceText' from 'L.H.S'.
  * Removed the trailing comma record field from  'StringLiteral'
  * Renamed exported functions for nomenclature consistency.
  * Deprecated the renamed functions

Fixes #26953

- - - - -
a1f2558b by Recursion Ninja at 2026-06-30T21:37:12-04:00
Monomorphising GHC pass parameters where appropriate

- - - - -
7bf9e3c5 by Teo Camarasu at 2026-06-30T21:38:03-04:00
Make Q abstract

This patch aims to clearly demarcate the internal and external interfaces
of Q.
In the past the `Quasi` typeclass was both part of the external,
public-facing interface, and was used to give the implementation of `Q`.

Now we separate out these two distinct roles. `Quasi` continues to exist
in the public interface, but we introduce a new `MetaHandlers` type,
which is equivalent to `Dict Quasi`.

`Q a` is now defined to be `MetaHandlers -> IO a`, and, crucially,
the constructor and the new `MetaHandlers` type are not exposed from the
public interface.

This gives us the ability to vary the interface on the GHC side without
forcing a breaking change on the `template-haskell` side.
Similarly `template-haskell` has more freedom to change the `Quasi`
typeclass without needing any changes in `lib:ghc`.

Implements https://github.com/ghc-proposals/ghc-proposals/pull/700

Resolves #27341

- - - - -
4262af36 by L0neGamer at 2026-06-30T21:38:56-04:00
generically defines mconcat in terms of internal type's Semigroup instance

add changelog entry

use simpler definition for mconcat

`nonEmpty` isn't available yet; inline branches in case

add test case

fixup generically defines mconcat in terms of internal type's Semigroup instance

add comment on Generically and deriving mishaps

swap mconcat to foldr version

add some strictness testing for mconcat

add to `base` changelog entry

- - - - -
e22ad997 by Cheng Shao at 2026-06-30T21:39:43-04:00
hadrian/rts: fix unregisterised build for gcc 15+

This patch fixes unregisterised build for gcc 15+:

- Pass -optc-Wno-error in hadrian when +werror enables -optc-Werror,
  see added comment for details.
- For RTS functions that the codegen would emit calls, ensure their
  real prototype is hidden when the header is included in .hc fies
  (IN_STG_CODE), and the dummy prototype is provided to match the EFF_
  convention.

In the future we should get rid of EFF_ (#14647) and remove these
hacks, but for now this patch makes unregisterised work again on newer
toolchains. Fixes #27404.

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

- - - - -
3f00f234 by Cheng Shao at 2026-06-30T21:40:32-04:00
compiler: fix missing handling of CmmUnsafeForeignCall node in LayoutStack

This patch fixes missing handling of `CmmUnsafeForeignCall` middle
node in the `LayoutStack` pass.

Before proc-points splitting, this pass computes liveliness of local
registers, and spills those alive across a Cmm native call onto the
stack. It need to traverse all middle nodes in each block and check
whether a local register is an assignee, if so then the previous
mapping in `sm_regs` is invalidated and needs to be dropped. However,
it didn't handle `CmmUnsafeForeignCall` node which may also assign to
a local register. When proc-points splitting is enabled, this can
produce an invalid basic block that doesn't properly backup the
updated local register to the stack before doing a Cmm call, resulting
in completely invalid runtime behavior.

The patch also adds a `T27447` regression test. With no-TNTC or with
LLVM backend, without the fix the test case would output a stale
0x1111111111111111 value, instead of the expected 0x2222222222222222
output.

Fixes #27447.

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

- - - - -
701088db by Ben Gamari at 2026-07-01T10:34:03-04:00
gitlab-ci: Drop vestigial references to make build system

- - - - -
62d54a53 by Ben Gamari at 2026-07-01T10:34:03-04:00
gitlab-ci: Add support for running specifying a job's testsuite ways

- - - - -
7f97ac2c by Ben Gamari at 2026-07-01T10:34:03-04:00
gitlab-ci: Run llvm testsuite ways in llvm jobs

Addresses #25762.

- - - - -
7ea75116 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Add normalise_ddump_deriv setup function

Some tests check the result of -ddump-deriv, which may contain INLINE pragmas depending on optimization flags.
With normalise_ddump_deriv setup function, INLINE pragmas are stripped off.

- - - - -
c7a8199f by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Use -dsuppress-idinfo to make tests more robust

Previously, T18052a and T21755 were failing on 'optasm' and 'optllvm' ways because of visibility of unfoldings.

- - - - -
a12122e5 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Use a trick to keep large objects alive

Previously, T17574 and T19381 were failing on 'optasm' and 'optllvm' ways because of compiler optimizations.
Change them to use NOINLINE to prevent unwanted optimizations.

- - - - -
1a95b327 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Only run T24224 in 'normal' way

This test is a frontend-only one and breaks if optimizations are enabled.

- - - - -
8abea737 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Ignore T18118's stderr

When optimizations are enabled, the compiler emits a warning (You cannot SPECIALISE ...).
The message is not important, so ignore it.

- - - - -
9453a722 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Mark T816 and tc216 broken with optimizations

These tests are about type checking, so we should not care too much if they are broken with optimizations.

See #26952

- - - - -
0aef9ec0 by Ben Gamari at 2026-07-01T10:34:03-04:00
testsuite: ds014 is not longer broken

It now appears to pass in the ways it was marked as broken in.

Closes #14901.

- - - - -
4692d1e4 by Ben Gamari at 2026-07-01T10:34:03-04:00
testsuite: Only run stack cloning tests in the normal way

These are too dependent upon code generation specifics to pass in most
other ways.

- - - - -
c154df26 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Update options_ghc_fbyte-code

The `-fbyte-code` option used to be overriden by `-fllvm` but it is no longer true since !14872 was merged.

I updated the test to accept the new behavior.

Closes #27049

- - - - -
5d8bb7b5 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Only run T22744 in 'normal' way

This test takes a long time on optimized ways.

- - - - -
d1e74c8e by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Disable tests that use -finfo-table-map on llvm ways

Currently, -finfo-table-map does not work with -fllvm. See #26435

- - - - -
3bf38c84 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Don't run T24726 on optimized ways

If optimizations are enabled, the rewrite rule just fires and -drule-check will report nothing.

- - - - -
e4eef116 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Use -fno-unoptimized-core-for-interpreter when running LinkableUsage01/02

Optimizations for the bytecode interpreter are considered experimental, and need a flag to be enabled.

- - - - -
234a9872 by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Suppress unwanted optimizations on T25284

- - - - -
99a2af2f by ARATA Mizuki at 2026-07-01T10:34:03-04:00
testsuite: Don't run stack_big_ret with optimizations

Stack layout may change with optimizations enabled.

- - - - -
04c836df by ARATA Mizuki at 2026-07-01T10:34:04-04:00
testsuite: Mark memo001 broken on optimized ways

See #27396

- - - - -
1a8a24f4 by ARATA Mizuki at 2026-07-01T10:34:04-04:00
testsuite: Mark syn-perf broken on optimized ways

See #27398

- - - - -
40412093 by Duncan Coutts at 2026-07-01T10:34:50-04:00
Add a test for thread scheduler fairness

It also tests that the interval timer and context switching works.
We also test that fairness is lost when the context switching interval
is too coarse for the duration of the test.

We add this test before doing surgery on the interval timer, so we have
decent coverage.

- - - - -
3f34d557 by Duncan Coutts at 2026-07-01T10:34:50-04:00
Make exported stop/startTimer no-ops, and rename internal functions

Specifically, internally rename:
stop/startTimer to pause/unpauseTimer
stop/startTicker to pause/unpauseTicker

and keep stop/startTimer as exported functions, but now as no-ops.

In the past the stop/startTicker actions were used incorrectly as if
they were synchronous, which they are not. See issue #27105. We now
document pause/unpackTicker as being async and not to be used for the
purpose of concurrency safety.

The existing stop/startTimer (note Timer not Ticker, the Timer calls the
Ticker!) are also exported from the RTS as a public API. This was
historically because the ticker used signals and it was important to
suspend the timer signel over a process fork. So these functions were
exported to be used by the process and unix libraries.

We cannot just remove the RTS exports, but we now make them no-ops, and
they can be removed from the process and unix library later. This
was already documented in a changelog.d entry no-more-timer-signal but
due to changes during the MR process the change to make stop/startTicker
into no-ops didn't make it into the earlier MR.

- - - - -
02e84e5f by Duncan Coutts at 2026-07-01T10:34:51-04:00
Make exitTicker/exitTimer unconditionally synchronous

We never use them asynchronously, and we should never need to do so.

And update some related comments.

- - - - -
13db6a72 by Duncan Coutts at 2026-07-01T10:34:51-04:00
posix ticker: update and improve comments on (un)pause and exit

Clarify what is async vs sync.

- - - - -
43d9a07d by Duncan Coutts at 2026-07-01T10:34:51-04:00
posix ticker: split out ppoll/select helper functions

Move the #ifdefs out of the main code body by introducing local helper
functions and types, which themselves have two implementations (with a
common API) based on ppoll or select.

This helps improve clarity/readability.

- - - - -
a5491baa by Duncan Coutts at 2026-07-01T10:34:51-04:00
posix ticker: improve the implementation

The existing implementation supported pausing and exiting, with the
implementation of pausing reling on a mutex and condition variable.
It needed to check the pause and stop shared variables on every
iteration. It relies on ppoll or select, to wait on the timeout and also
wait on an interrupt fd. The interrupt fd was only used for prompt
exit/shutdown, and not for pausing or other notification. The pause only
needed a lock and a memory operation, but the pause was not prompt. The
resume used a lock, and signaling a cond var.

The new implementation uses a somewhat more regular design: every
notification is done by setting a shared variable and
interrupting/notifying the ticker via the fd. The ticker thread does not
need to check any shared variables on normal timer expiry, only when it
recevies notification. This may be a micro-optimisation, but the tick
occurs 100 times a second by default so any improvements in the hot path
are amplified. When the ticker thread does receive notification it can
check the various shared variables and update its local state. The
blocking relies on using ppoll/select but without a timeout. This avoids
the condition var and also allows further notifications when paused
(also used for unpausing).

This design can be extended with further notification types if needed by
using and checking further shared vars (or making existing shared vars
an enum or counter). This may be used in future for additional
notifications to the ticker thread. This will likely be used to proxy
wakeUpRts from a single handler context for example. And this approach,
avoiding mutexes, is compatible with use from signal handlers.

So overall, it's:
 * slightly simpler / more regular;
 * easier to extend with additional notifications;
 * probably slightly more efficient (but a micro-optimisation);
 * and supports calling notification from signal handlers

- - - - -
5b20821e by Duncan Coutts at 2026-07-01T10:34:51-04:00
posix ticker: further minor local renaming for code clarity

Improve the clarity with better choice of names for several local vars
and function.

- - - - -
1f3ec5e0 by Duncan Coutts at 2026-07-01T10:34:51-04:00
win32 ticker: split out local helper functions

- - - - -
596e7307 by Duncan Coutts at 2026-07-01T10:34:51-04:00
win32 ticker: provide guarantee about concurrency and idempotency

Use a lock to ensure pause/unpause can be used concurrently. Use a
paused variable, protected by the lock, to ensure that pause and unpause
are both idempotent. This is what the portable API expects.

- - - - -
1870edd7 by Duncan Coutts at 2026-07-01T10:34:51-04:00
win32 ticker: make the initial tick be after one wait interval

There is no need to tick immediately. This is consistent with the
posix implementation.

- - - - -
7c15ab5b by Duncan Coutts at 2026-07-01T10:34:51-04:00
ticker: remove now-unnecessary layer of enable/disable

There was an atomic variable used to block *part* of the actions of the
tick handler. This still did not make stopTimer synchronous, even for
the part of the the handle_tick actions it covered. It also added a more
expensive (sequentuially consistent) atomic operation in the hot path
for the handle_tick action, whereas our new design requires no atomic
ops at all.

Now that we have eliminate the need for synchronous stop/startTicker,
we don't need this not-quite-working-anyway atomic protocol. The new
pause/unpauseTicker is explicitly asynchronous and idempotent.

- - - - -
8585f8cb by Duncan Coutts at 2026-07-01T10:34:51-04:00
ticker: add TODOs about issue #27250: too much being done from handle_tick

The handle_tick should not perform I/O, block, perform long-running
operations or call arbitrary user code. Unfortunately, everything to
do with the eventlog (at the moment) falls into all those categories.

- - - - -
6e381626 by Duncan Coutts at 2026-07-01T22:29:55+01:00
Adjust releaseCapability_ precondition to allow cap->running_task == NULL

There are two use cases for releaseCapability_:

1. The current Task (cap->running_task) releases the Capability.
   The Capability is marked free, and if there is any work to do,
   an appropriate Task is woken up.

2. There is no current task (cap->task == NULL), and thus the
   Capability is idle, and we want to wake up an idle Task to animate
   the Capability. This case uses always_wakeup.

Currently, the precondition for releaseCapability_ is
  cap->running_task != NULL
and so the 2nd use cases have to set cap->running_task (which is then
immediately overwritten) just to satisfy the precondition. See the
use cases in sendMessage and prodCapability.

So we can relax the precondition to be:
  cap->running_task != NULL || always_wakeup
so that in the always_wakeup case, we say it is ok for the
cap->running_task to be NULL.

This lets us simplify sendMessage and prodCapability. In particular it
will allow prodCapability to not need a Task parameter.

The ulterior motive for all this is that I want to be able to call
prodCapability from an OS thread that is not itself a Task, in persuit
of issue #27086: disentangle I/O managers from wakeUpRts. The most
straightforward way to wake the RTS is using prodCapability, but the
context in which we will need to do that are threads that are not Tasks.

- - - - -
89404ebc by Duncan Coutts at 2026-07-01T22:29:55+01:00
prodCapability no longer needs to take a Task param

Now that releaseCapability_ can accept cap->running_task == NULL then it
is no longer necessary for prodCapability to require a Task.

- - - - -
4e60c5f6 by Duncan Coutts at 2026-07-01T22:29:56+01:00
Define prodOneCapability

There was an existing declaration for this in the header file, but no
definition.

Similarly, there is a declaration for prodAllCapabilities but no
definition, and we don't need it, so remove the declaration.

- - - - -
2527026f by Duncan Coutts at 2026-07-01T22:29:56+01:00
Add a wakeUpRtsViaTicker feature to the posix ticker

It proxies a call to wakeUpRts, but crucially, this can be called from
a signal handler context. It will be used for ctl-c handling.

- - - - -
aa5a03a5 by Duncan Coutts at 2026-07-01T22:29:56+01:00
Change how wakeUpRts works

Previously it would call wakeupIOManager to get a capability to wake up
and run. This works but it entangles the I/O managers with unrelated
features: ctl-c handling and idle gc (the two features that use wakeUpRts).

The reason it used wakeupIOManager is that this action is safe to use
from a posix signal handler, since it just posts bytes to a pipe.
Otherwise the more direct approach (used e.g. by sendMessage when the
target capability is idle) is to use releaseCapability. But that uses
condition variables and mutexes, which are not safe to use from within a
signal handler.

So instead of entangling the (multiple) I/O managers with this, we make
wakeUpRts use the direct approach (using prodOneCapability). On win32
the ctl-c console handler can call wakeUpRts directly, since it is
called in a proper thread. On posix, to deal with the signal handler
problem, we make the signal handler ask the ticker thread to proxy the
call to wakeUpRts, since the ticker thread is also a proper thread.

This will allow the I/O managers to no longer be concerned with this.
This is good because there are many I/O managers (and they're
complicated), but there is (on posix) only one ticker implementation. So
this is an overall reduction in coupling and complexity.

Fixes issue #27086

- - - - -
c6d53c16 by sheaf at 2026-07-02T21:35:44-04:00
Test driver: normalise line numbers into libraries

When comparing the stdout of tests that print out callstacks, we can't
rely on the stability of exact line:column spans pointing into libraries
(e.g. ghc-internal), as any change (such as adding a comment) can change
them.

This commit addresses this by normalising away line:column in callstacks,
but only when those point into internal libraries. We don't do this in
general, as the exact span might be important to the test (e.g. for a
span within the test module itself).

Fixes #27387

- - - - -
81ee62e0 by Alan Zimmerman at 2026-07-02T21:36:33-04:00
EPA: Remove LocatedLW from MatchGroup

This is the last usage of LocatedLW / SrcSpanAnnLW

- - - - -
925959db by Recursion Ninja at 2026-07-04T04:14:12-04:00
Decoupling 'L.H.S' from 'GHC.Hs.Doc'

  * Migrated 'GHC.Hs.Doc' and 'GHC.Hs.DocString' AST defintions from 'GHC.*' namespace,
    to new 'Language.Haskell.Syntax.Doc' module in the 'L.H.S' "namespace."
  * Updated 'HsDocString to be TTG-parameterised as 'HsDocString pass'.
  * Added 'GHC.Hs.Extension.Pass': splits 'GhcPass'/'Pass' and all 'HsDocString'
    TTG instances out of 'GHC.Hs.Extension', which re-exports it unchanged
    (this is backwards compatible and prevents the introduction of a boot file).
  * Deleted 'GHC.Hs.Doc.hs-boot'; removed all 'L.H.S.*' imports of 'GHC.Hs.Doc'.
  * Updated 'GHC.Hs.DocString' to be TTG pass-parameterised throughout; moved
    'mkHsDocStringChunk'/'unpackHDSC' here (require 'GHC.Utils.Encoding').
  * Split 'GHC.Rename.Doc.rnHsDoc' from 'rnHsDocIdentifiersOnly'.
  * Updated parser, renamer, typechecker, HIE, and exact-print for new types.
  * Added 'HsDocString' TTG instances for 'DocNameI' to 'Haddock.Types'.
  * Killed the last module loop between GHC.* and LHS.*.
        - Only edges from LHS.* to GHC.Data.FastString now!

Resolves #26971

- - - - -
b7e24044 by mangoiv at 2026-07-04T04:14:56-04:00
ci: retry fetching test metrics

Retry fetching test metrics to make the CI not fail if the services is
temporarily unavailable

- - - - -
4180af3f by Zubin Duggal at 2026-07-04T04:15:38-04:00
Bump semaphore-compat submodule to 2.0.1

This versions includes some cruicial fixes for darwin

- - - - -
242d4317 by sheaf at 2026-07-04T04:16:19-04:00
Remove outdated comment in GHC.Data.ShortText

There was a long comment in GHC.Data.ShortText about a workaround that
was necessary when bootstrapping with GHC 9.2 and below. The actual
logic has since been dropped, but the comment remained. This commit
removes the vestigial comment.

- - - - -
9b714c4c by Zubin Duggal at 2026-07-05T09:40:36+05:30
CorePrep: Don't speculatively evaluate bindings that we have already discovered to be absent

In #25924, we segfault because speculation forces a projection out of a RUBBISH dictionary
(which we generated because it absent).

Solution: Don't speculate on bindings we already know are absent.

Fixes 25924

- - - - -
4a59b3ee by Zubin Duggal at 2026-07-05T09:40:36+05:30
Don't make absent fillers for terminating types

In #25924 we discovered that we could speculatively evaluate an absent filler
for a dictionary, and project a field (a superclass selector) out of it,
resulting in segfaults.

Solution: Never make an absent filler or rubbish literal for a terminating type
like a dictionary. mkAbsentFiller returns Nothing for isTerminatingType, so
worker/wrapper and the specialiser keep the real argument instead.

Some small metric decreases because we do a little less work in the
simplifier now.

Metric Decrease:
    T9872a
    T9872b
    T9872c
    TcPlugin_RewritePerf

- - - - -
383ddcd4 by Alan Zimmerman at 2026-07-06T07:08:16-04:00
EPA: Move the 'where' annotation for PatSynBind

This allows us to move it out of the MatchGroup exact print annotation
too

- - - - -
66d1a5d5 by fendor at 2026-07-07T16:57:56-04:00
Add 'backendInfoTableMapValidity' backend predicate

Check whether the backend supports the `-finfo-table-map` flag and
ignore it otherwise.

Improve by-design documentation of `backendCodeOutput`.

`Backend` is **abstract by design**. Make this clearer in
`backendCodeOutput` which is incorrectly being used as a proxy for
`Backend`.

Instead, define the desired property predicates in GHC.Driver.Backend
In the process, make `backendCodeOutput` total.

- - - - -
74f1071d by fendor at 2026-07-07T16:57:56-04:00
Add failing test for `-finfo-table-map` and bytecode backend

If you compile a module using the bytecode backend, with
-finfo-table-map, then the info table map doesn't get populated for the
module.

This is because the -finfo-table-map code path is implemented mostly in
the StgToCmm phase which isn't run when creating bytecode.

Ticket #27039

- - - - -
28d63bca by mangoiv at 2026-07-07T16:59:16-04:00
ci: don't fail nightly if there have been no changes that night

Fixes #27127

- - - - -
4ebfc478 by Rodrigo Mesquita at 2026-07-08T04:47:53-04:00
ttg: Using ShortText over FastString in the AST

To make the AST independent of GHC, this commit replaces usages of
`FastString` with `HText` in the AST, killing the last edge from
Language.Haskell.* to GHC.* modules.

Even though we /do/ want to use FastStrings in general -- critically in
Names or Ids -- there is no particular reason for the FastStrings that
occur in the AST proper to be FastStrings. Strings in the AST are
typically unique and don't benefit particularly from being interned
FastStrings with Uniques for fast comparison.

`HText` is a type synonym for `ShortText` which uses GHC's Modified
UTF-8 encoding exclusively.

Modified UTF-8 must be used to represent the Haskell AST because the
Haskell Report allows surrogate code points. `Data.Text.Text` functions
use Standard UTF-8 which replace surrogates with a placeholder value,
thus `Data.Text.Text` is unsuitable for AST strings. See the
`Language.Haskell.Syntax.Text` module header for more details.

Final progress towards #21592

Closes #21628

- - - - -
d910b353 by Simon Peyton Jones at 2026-07-08T04:48:36-04:00
Update equality-type documenation in GHC.Builtin.Types.Prim

Fix #27466

- - - - -
b2530542 by Simon Peyton Jones at 2026-07-08T04:48:36-04:00
Honour -dsuppress-coercions in GHC.Core.TyCo.pprCo

Fixes #27467

- - - - -
9a73179a by Facundo Domínguez at 2026-07-08T04:49:26-04:00
Add item to MR checklist asking to squash fixup commits after approval

The checklist has an item that reads

    All commits are either individually buildable or squashed.

This item could be checked immediately after sending the merge request
though. If reviewers ask for amends later on, and the author amends
the merge request, there was no item that would remind the contributors
to squash the fixup commits before landing.

This commit adds a new item

    After all approvals and before landing: all fixup commits are squashed with their originating commits.

which should be harder to mark as done before approvals have been given.

- - - - -
ed09895d by Andreas Klebinger at 2026-07-08T16:53:27-04:00
Fix a profiling race condition resulting in segfaults.

StgToCmm: Don't assume tagged FUN closures in closureCodeBody.
When entering a closure the self/node pointer might not be tagged in
some situations when a thunk is evaluated by multiple threads.
So we most AND away the tag bits rather than subtracting an expected tag.

Apply.cmm: Fix a race condition occuring when a thunk is mutated during GC.

In stg_ap_0_fast when might need to run GC before entering a thunk. If this happens
another thread or the GC itself might mutate the closure making entering it no longer
valid. We now check for this.

Add test and changelog for #27123 fixes.

- - - - -
67c03eb2 by Cheng Shao at 2026-07-08T16:54:09-04:00
ghc-heap: fix invalid srtlen returned by peekItbl when no-TNTC

This patch fixes the no-TNTC code path of `peekItbl` so that it looks
at the right memory address when reading the `srt` field from the
`StgInfoTable_` struct. Also adds a `T27465` regression test that
reproduces the bug on no-TNTC builds before the fix. Fixes #27465.

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

- - - - -
2ecabb4f by Zubin Duggal at 2026-07-09T09:23:25-04:00
hadrian: binary-dist-dir should not be the default target

Revert behaviour to pre 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2

In 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2, we applied the following behaviour change:

```
hadrian: Build stage 2 cross compilers
...
* hadrian: Make binary-dist-dir the default build target. This allows us
  to have the logic in one place about which libraries/stages to build
  with cross compilers. Fixes #24192
```

This is a major regression to development experience, a plain hadrian/build
--freeze1 now takes ages because we rebuild all docs (which need to go in the
binary dist dir).

`binary-dist-dir` is the wrong default target for regular GHC development work

Fixes #27445

- - - - -
e16388e3 by Zubin Duggal at 2026-07-09T09:23:25-04:00
.gitignore: Add the hadrian system.config introduced by commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2

Since

commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2
Author: Matthew Pickering <matthewtpickering@gmail.com>
Date:   Thu Dec 21 16:17:41 2023 +0000

    hadrian: Build stage 2 cross compilers

./configure produces /hadrian/cfg/system.config.{host,target}

Add these to .gitignore

- - - - -
7e8abf41 by Alan Zimmerman at 2026-07-09T09:24:12-04:00
EPA: Replace AnnListItem with simply [TrailingAnn]

Remove the unnecessary wrapper around a single field.

- - - - -
29032f17 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Keep real reason for fragile test failures

- - - - -
c34e03a7 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Fall back to the failure reason for empty JUnit bodies

- - - - -
409d40f0 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Show output diffs in JUnit output

Also refactor compare_outputs to return essentially a `Maybe Diff`
(`CompareOutput`) instead of a bool, but more pythonic. This
allows us to pass the diff through nice.

- - - - -
06fee1ab by Zubin Duggal at 2026-07-09T09:24:58-04:00
perf notes: include stat deviation and acceptance window in notes so they show up in gitlab

- - - - -
57c0f32c by mangoiv at 2026-07-10T11:08:38-04:00
driver: enable -finter-module-far-jumps by default

this fixes a compatibility bug with certain binutils/gcc versions where
we were seeing jump offset overflow errors.
This commit can probably reverted if we stop supporting the problematic
binutils/gcc verions (2.44 and 14.2, respectively)

Reolves #26994

- - - - -
4396a6f2 by Andrea Vezzosi at 2026-07-10T11:09:25-04:00
[Fix #27287] preserve ModBreaks in ModIface

- - - - -
ed261a7e by Cheng Shao at 2026-07-14T17:59:38-04:00
hadrian: fix HLS support

This patch fixes hadrian's HLS support so one can rely on HLS when
working on the hadrian codebase. Fixes #27480.

Not building/linking shared libraries for hadrian is a severely
premature optimization; this top-level setting in `cabal.project` only
affects home packages while the dependencies in the cabal store are
built with vanilla/dynamic anyway, and even adding dynamic builds to
home packages would not be costly due to cabal's usage of
`-dynamic-too`.

- - - - -
eee8ec5b by Cheng Shao at 2026-07-14T18:00:20-04:00
compiler: fix miscompiled %load_relaxed, add missing %store_relaxed

This patch fixes the %load_relaxed cmm primop compilation logic to
correctly use relaxed memory ordering, and adds the missing
%store_relaxed primop. Parsing logic of %load/%store with explicit
ordering is covered in the AtomicFetch test case. Fixes #27483.

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

- - - - -
1718230f by Alan Zimmerman at 2026-07-14T18:01:06-04:00
EPA: Keep binds and sigs together in HsValBindsLR

We combine them into a single list for GhcPs, wrapped in the
ValBind data type, which is the bind equivalent of ValD, having
constructors for binds and sigs.

This simplifies exact print processing, especially when using it to
update the contents of local binds, as we no longer need AnnSortKey
BindTag

- - - - -
6bd1ad2a by Andreas Klebinger at 2026-07-14T18:01:49-04:00
Bump nofib submodule to account for MonoLocalBinds.

New versions of GHC enable MonoLocalBinds by default.
This breaks some of the benchmarks. I've fixed this and
this bump pulls in that fix.

- - - - -
7eb0f1c9 by Cheng Shao at 2026-07-14T18:02:31-04:00
testsuite: fix bytecodeIPE test under +ipe flavours

This patch fixes the bytecodeIPE test under +ipe flavours. It used to
fail under +ipe because the RTS is built with IPE info, then
stg_AP_info in RTS carries IPE info, so whereFrom wouldn't return
Nothing. Now the test checks IPE info of a datacon in the ghci-loaded
module which is not affected by whether the RTS is built with IPE info
or not. Fixes #27498.

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

- - - - -
ef038aae by cydparser at 2026-07-15T04:35:41-04:00
Reduce bytes allocated for `capabilities` in RTS (fixes #27487)

In rts/Capability.c, `capabilities` is an array of pointers, but it was allocated as if it were an
array of Capability's.

- - - - -
d377e83e by Cheng Shao at 2026-07-15T04:36:27-04:00
rts: fix missing UNTAG in stg_readTVarIOzh

This patch fixes missing UNTAG on the current value closure read from
StgTVar. UNTAG is a no-op when it's stg_TREC_HEADER_info which is word
aligned; it may be a tagged closure, and reading info table from the
tagged address is an unaligned load which may cause issues on
platforms with strict alignment requirements.

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

- - - - -
8ed03842 by Cheng Shao at 2026-07-15T04:36:27-04:00
rts: fix missing UNTAG in stg_control0zh_ll

This patch fixes missing UNTAG on the cont closure returned by
captureContinuationAndAbort. In case it's not NULL,
captureContinuationAndAbort returns a tagged StgContinuation closure,
in which case it must be untagged before accessing the
apply_mask_frame field.

In the past it worked out of luck: when apply_mask_frame was NULL then
mask_frame_offset is also 0 so the control flow didn't diverge to a
wrong path. Still, this is horribly wrong and will crash once
StgContinuation struct is refactored and fields are shuffled around.

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

- - - - -
5aa7000a by Cheng Shao at 2026-07-15T04:37:08-04:00
compiler: fix redundant AP thunk codegen when not using -ticky-ap-thunk

This patch fixes a double negation confusion in !7525 that results in
some redundant AP thunk code generation when not using
-ticky-ap-thunk. Now, we use `stgToCmmUseStdApThunk` to indicate
whether precomputed AP thunks in the RTS should be used, which
defaults to `True`, unless `-ticky-ap-thunk` is passed.
`-finfo-table-map` now also implies `-ticky-ap-thunk`, since when
doing IPE profiling we want the generated AP thunks to be unique.
Fixes #27502.

-------------------------
Metric Decrease:
    T3064
-------------------------

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

- - - - -
d43a7b7a by Brian McKenna at 2026-07-15T20:10:04+02:00
Strip ticks when desugaring bool guards

The special `considerAccessible` pattern was broken when compiling
with debug info. Compiling with debug info wraps expressions with
`SourceNote` ticks, which broke the internals of the
`desugarBoolGuard` function. Ticks are now ignored within this
function.

Fixes #27360

- - - - -
ede4b17b by Ben Gamari at 2026-07-15T22:59:53-04:00
base: Display ExceptionContext in WhileHandling's textual description

As originally-implemented the implementation for
`WhileHandling(displayExceptionAnnotation)` would display the
`ExceptionContext` of the exception which it carries (as this was the
behavior of `displayException`, in terms of which
`displayExceptionAnnotation` was implemented).

However, in 284ffab3 the definition of `SomeException(displayException)`
was changed to exclude the `ExceptionContext`. This means that
`WhileHandling(displayExceptionAnnotation)` fails to describe the
provenance of the exception which it captures, greatly limiting its
utility.

Return the implementation to its originally-specified behavior by
implementing `WhileHandling(displayExceptionAnnotation)` in terms of
`displayExceptionWithInfo`.

Fixes #27456.

- - - - -
0f64f348 by Cheng Shao at 2026-07-16T15:41:08+00:00
ci: add missing docker permission workaround in abi-test job

- - - - -
660cb239 by Cheng Shao at 2026-07-16T19:37:48+00:00
bindist: Fix make install -j race condition on macos/freebsd

This patch fixes make install -j race condition on macos/freebsd. BSD
install fails with EEXIST when multiple install processes concurrently
create the same prefix directory. So we add an `install_dirs`
prerequisite job that sequentially creates the directories for
subsequent jobs to work with. Fixes #27499.

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

- - - - -
08130257 by Cheng Shao at 2026-07-16T19:37:48+00:00
ci: run bindist make install with -j

This patch makes the ci scripts run `make install` with `-j` to reduce
wall clock time when installing the bindist, see related issue for
benchmark numbers. This only affects ghc ci logic, the user-facing
default is up to distributors and is still `-j1`. Closes #27029.

- - - - -
d5ae6906 by Adam Gundry at 2026-07-17T04:57:43-04:00
Mark various language extension flags as deprecated (see #27329)

The following language extensions are now deprecated:

 - AlternativeLayoutRule
 - AlternativeLayoutRuleTransitional
 - ParallelArrays
 - PolymorphicComponents
 - Rank2Types

In addition, the warning `-Walternative-layout-rule-transitional`
has been marked as deprecated, as it is emitted only under the
deprecated extension `XAlternativeLayoutRuleTransitional`.

- - - - -
fe3b059c by Andrew Lelechenko at 2026-07-17T04:58:26-04:00
base: re-export GHC.Environment.getFullArgs from System.Environment

CLC proposal https://github.com/haskell/core-libraries-committee/issues/431

- - - - -
722236dd by sheaf at 2026-07-18T08:48:31-04:00
Coercion optimisation: avoid double-Sym for InstCo

Ticket #27374 pointed out an issue with GHC.Core.Coercion.Opt.optCoercion's
handling of InstCo: it contravened (LC2) in Note [The LiftingContext in optCoercion]
because it applied the ambient 'sym' to a coercion that was then added
to the lifting context substitution.

Fixes #27374

Co-authored-by: Simon Jakobi <simon.jakobi@gmail.com>

- - - - -
ff70fc75 by sheaf at 2026-07-18T08:48:31-04:00
Coercion optimisation: avoid exponential behaviour

The change to coercion optimisation of 'InstCo' in the previous commit
introduces exponential behaviour to the coercion optimiser. To avoid
this, this commit provides a way to push in 'Sym' of an already-optimised
coercion: GHC.Core.Coercion.Opt.mkDeepSymCo.

See Note [Pushing Sym without re-optimising] in GHC.Core.Coercion.Opt.

- - - - -
dfef27f0 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Move THREADED_RTS-conditional struct members to end of Capability

Accessing members of the Capability struct from CMM code rely on
accessor macros. (The macros are generated by deriveConstants).

These macros have a single definition. This means that the offsets of
all struct members must *not* vary based on THREADED_RTS vs
!THREADED_RTS. This requires that any struct members that are
conditional on THREADED_RTS must occur after the unconditional struct
members. Hence we move all the ones that are conditional on
THREADED_RTS to the end.

Add a deriveConstants entry for the iomgr member of the Capability
struct, which was the motivation for this change.

Add warning messages to help our future selves. Debugging this took me
a couple hours in gdb!

- - - - -
c254e022 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Make the IOManager API use CapIOManager rather than Capability

This makes the API somewhat more self-contained and more consistent.
Now the IOManager API and each of the backends takes just the I/O
manager structure. Previously we had a bit of a mixture, depending on
whether the function needed access to the Capability or just the
CapIOManager.

We still need access to the cap, so we introduce a back reference to
reach the capability, via iomgr->cap.

Convert all uses in select and poll backends, but not win32 ones.
Convert callers in the scheduler and elsewhere.

Also convert the three CMM primops that call IOManager APIs. They just
need to use Capability_iomgr(MyCapability()).

- - - - -
4f3d8f31 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Split posix/MIO.c out of posix/Signals.c

The MIO I/O manager was secretly living inside the Signals file.

Now it gets its own file, like any other self-respecting I/O manager.

- - - - -
52ce04a9 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Rationalise some scheduler run queue utilities

Move them all to the same place in the file.

Make some static that were used only internally.

Also remove a redundant assignment after calling truncateRunQueue that
is already done within truncateRunQueue.

- - - - -
75bbdebc by Duncan Coutts at 2026-07-18T08:49:12-04:00
Rename initIOManager{AfterFork} to {re}startIOManager

These are more accurate names, since these actions happen after
initialisation and are really about starting (or restarting) background
threads.

- - - - -
724c0517 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Free per-cap I/O managers during shutdown and forkProcess

Historically this was not strictly necessary. The select and win32
legacy I/O managers did not maintain any dynamically allocated
resources. The new poll one does (an auxillary table), and so this
should be freed.

After forkProcess, all threads get deleted. This includes threads
waiting on I/O or timers. So as of this patch, resetting the I/O
manager is just about tidying things up. For example, for the poll
I/O manager this will reset the size of the AIOP table (which
otherwise grows but never shrinks).

In future however the re-initialising will become neeecessary for
functionality, since some I/O managers will need to re-initialise
wakeup fds that are set CLOEXEC.

- - - - -
c007d122 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a TODO to the MIO I/O manager

The direction of travel is to make I/O managers per-capability and have
all their state live in the struct CapIOManager. The MIO I/O manager
however still has a number of global variables.

It's not obvious how handle these globals however.

- - - - -
b65ab7b3 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a FIXME note in the Poll I/O manager

- - - - -
daf2bd6f by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add missing updateRemembSetPushClosure in poll I/O manager

For the non-moving GC.

- - - - -
e33ca830 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Minor doc improvement to struct StgAsyncIOOp member outcome

Mention the enumeration names, as well as their numeric values. The rest
of the code uses the enum names.

- - - - -
4edd2579 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Minor doc improvements for StgTSOBlockInfo

Clarify that certain union members are used only by certain legacy
I/O managers. Hopefully we will be able to remove these at some point.

- - - - -
536bedbb by Duncan Coutts at 2026-07-18T08:49:12-04:00
Avoid exporting various win32-specific rts symbols

The BeginPrivate.h / EndPrivate.h scheme works perfectly well on
Windows, but all of the rts/win32/*.h files were not using it.

- - - - -
8139b5ac by Duncan Coutts at 2026-07-18T08:49:12-04:00
Remove wakeupIOManager, ioManagerWakeup and setIOManagerWakeupFd

We no longer need wakeupIOManager for the threaded RTS case, so we can
remove it and the bits only needed to support it. This includes the
pipe/eventfd fd shared between the RTS and the in-library I/O manager
used for waking up the I/O manager thread. The pipe/eventfd still
exists, but it no longer has to be communicated to the RTS, since the
RTS no longer needs to use it.

So we remove the RTS API export setIOManagerWakeupFd, and remove uses of
it within the I/O managers in ghc-internal.

- - - - -
74fe7c66 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a new interruptIOManager API for the I/O managers

It will be used to interrupt awaitCompletedTimeoutsOrIO. Also update the
return type and docs for awaitCompletedTimeoutsOrIO to have it return
false when it gets interrupted, and have no useful post condition in
that case.

- - - - -
38792843 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for select I/O manager

Uses the FdWakup mechanism.

- - - - -
2f3b00aa by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for poll I/O manager

Uses the FdWakup mechanism.

A quirk we have to cope with is that we now need to poll one more fd --
the wakeup_fd_r -- but this fd has no corresponding entry in the
aiop_table. This is awkward since we have set up our aiop_poll_table to
be an auxilliary table with matching indicies.

The solution this patch uses (and described in the comments) is to have
two tables: struct pollfd *aiop_poll_table, *full_poll_table;
and to have the aiop_poll_table alias the tail of the full_poll_table.
The head entry in the full_poll_table is the extra fd. So we poll the
full_poll_table, while the aiop_poll_table still has matching indicies
with the aiop_table.

Hurrah for C aliasing rules.

- - - - -
cee50131 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for win32 legacy I/O manager

And remove unused related helper resetAbandonRequestWait. It is not
called because the event is created in auto-reset mode, so never needs
to be reset manually.

- - - - -
cf453143 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Note lack of interruptIOManager support for WinIO I/O manager

Though there's a plausible design, we can't sanely test it at the moment
due to related WinIO bugs. Filed as issue #27403.

- - - - -
1b74a0ad by Duncan Coutts at 2026-07-18T08:49:13-04:00
Be more explicit about enum IOReadOrWrite values, and type within cmm

Belt and braces.

- - - - -
b388d093 by Brian McKenna at 2026-07-18T17:51:50-04:00
Ignore ticks in the pattern-match term oracle

The term-oracle in the pattern-match checker is keyed by a canonical
form of the scrutinee, computed by `makeDictsCoherent`. That canonical
form was tick-sensitive: two occurrences of an otherwise identical
expression that happened to carry different ticks were treated as
distinct values, breaking long-distance information.

This shows up in practice under `-finfo-table-map`, because the
desugarer wraps every record-selector use site in a `SourceNote`
carrying that site's span. For example:

     data Box = Box { unBox :: Maybe Int }
     f b = case unBox b of
       Nothing -> 0
       Just _  -> let Just x = unBox b in x

The two `unBox b` expressionss carry different SourceNote spans, the
pattern-match checker sees them as different, the long-distance
information from the outer `Just _` branch never reaches the
let-pattern, and `Just x = unBox b` is wrongly reported as
non-exhaustive.

We now strip all ticks in `makeDictsCoherent`.  This is documented as
Wrinkle (UD1) of Note [Unique dictionaries in the TmOracle CoreMap].

Fixes #27314

- - - - -
c23e1acb by Mrjtjmn at 2026-07-18T17:52:45-04:00
Add explanations for unsolved Typeable constraints

This commit adds explanations for unsolved 'Typeable' constraints.

GHC will now provide additional explanations for an unsolved constraint
of the form 'Typeable ty', explain why GHC did not solve Typeable constraint.
e.g.:
 - 'ty' is a polymorphic type (e.g. forall a. a -> a)
 - 'ty' is a qualified type (e.g. Eq Int => Int)
 - 'ty' is an unboxed sum type
 - 'ty' is an unreduced type family application
 - 'ty' whose kind is not typeable

Fixes #26532

- - - - -
cbef021e by Artem Pelenitsyn at 2026-07-19T07:49:55-04:00
ghc-internal: Lock.hs: fix typo and indentation
- - - - -
42918646 by Duncan Coutts at 2026-07-19T07:50:36-04:00
Fix failing test GcStaticPointers for non-moving GC

Minor mistake in asserting something before checking for that same
thing.

Specifically, Bdescr asserts HEAP_ALLOCED_GC, but Bdescr was being used
prior to a guard that checks HEAP_ALLOCED_GC. The solution is just to
move the use of Bdescr after the guard.

Thanks to Simon Jakobi for identifying the problem.

- - - - -
c2f6dcd4 by Sasha Bogicevic at 2026-07-20T10:31:56+02:00
Improve error messages for invalid record wildcards

Record wildcard hints are now shown in more contexts and include
constructor arity; matching with `..` on a fieldless constructor
now produces a dedicated error message.

Fixes #21101

- - - - -
4c02e76b by Duncan Coutts at 2026-07-21T10:37:21-04:00
Mark test T27105 as fragile, citing issue #27522

Scheduler fairness is fine, except when it isn't. And it isn't on CI
machines surprisingly often! See the issue for details.

- - - - -
43dd2b15 by Recursion Ninja at 2026-07-21T17:09:53-04:00
Resolving many TTG related orphan type-class instances

This is part a technical debt removal effort made possible now
that separating out the AST via TTG has come to a close.

As the AST in 'L.H.S' has been incrementally separated from the GHC internals,
there are many accumulated orphan instance of 'Binary', 'NFData', 'Outputable',
and 'Uniquable'. The orphan instance of data-types from within 'L.H.S' have had
their orphan instances moved to either:
  1. The module which defines the data-type
  2. The module which defines the type-class;
     i.e. moving an orphan 'Binary' instance to 'GHC.Utils.Binary'

Orphan instances resolved (37):

  | Data-type            | Resolved instance(s)       | Former orphan module(s)   |
  | -------------------- | -------------------------- | ------------------------- |
  | Role                 | Binary, NFData, Outputable | GHC.Core.Coercion.Axiom   |
  | SrcStrictness        | Binary, NFData, Outputable | GHC.Core.DataCon          |
  | SrcUnpackedness      | Binary, NFData, Outputable | GHC.Core.DataCon          |
  | Fixity               | Binary, Outputable         | GHC.Hs.Basic              |
  | FixityDirection      | Binary, Outputable         | GHC.Hs.Basic              |
  | LexicalFixity        | Outputable                 | GHC.Hs.Basic              |
  | CCallTarget          | NFData                     | GHC.Hs.Decls.Foreign      |
  | CType                | NFData                     | GHC.Hs.Decls.Foreign      |
  | Header               | NFData                     | GHC.Hs.Decls.Foreign      |
  | OverlapMode          | Binary, NFData             | GHC.Hs.Decls.Overlap      |
  | WithHsDocIdentifiers | NFData, Outputable         | GHC.Hs.Doc                |
  | HsDocString          | NFData                     | GHC.Hs.DocString          |
  | HsDocStringChunk     | Binary, Outputable         | GHC.Hs.DocString          |
  | HsDocStringDecorator | Binary, Outputable         | GHC.Hs.DocString          |
  | NamespaceSpecifier   | Outputable                 | GHC.Hs.ImpExp             |
  | ForAllTyFlag         | Binary, NFData, Outputable | GHC.Hs.Specificity        |
  | Specificity          | Binary, NFData             | GHC.Hs.Specificity        |
  | PromotionFlag        | Binary, Outputable         | GHC.Types.Basic           |
  | FieldLabelString     | Outputable, Uniquable      | GHC.Types.FieldLabel      |
  | InlinePragma         | Binary                     | GHC.Types.InlinePragma    |

-------------------------
Metric Decrease:
    hard_hole_fits
-------------------------

Closes #21262, #27469

- - - - -
ab9ab895 by Cheng Shao at 2026-07-21T17:10:53-04:00
rts: always use StgInt to represent cost center id

Currently cost center id is modeled as `Int` and it should be `StgInt`
uniformly in the RTS, hence this patch. Fixes #27524.

- - - - -
94d8f83b by Cheng Shao at 2026-07-22T11:30:40-04:00
hadrian: clean up stale cabal package flags in the tree

This patch cleans up stale cabal package flags in the tree and related
hadrian/autoconf logic. Closes #27474.

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

- - - - -
0bf1d8c9 by Sasha Bogicevic at 2026-07-22T11:31:21-04:00
parser: don't suggest ImportQualifiedPost when it is already enabled

-Wprepositive-qualified-module unconditionally attached a hint to
enable ImportQualifiedPost, even when the extension was already on
(as it is by default under GHC2021). Record the extension's state in
the PsWarnImportPreQualified diagnostic and drop the hint when it is
already enabled.

Fixes #27380

- - - - -
700a1dd1 by Simon Jakobi at 2026-07-23T11:21:20-04:00
ci: Reduce lint job setup costs

Avoid fetching unnecessary history and submodules for lightweight lint
jobs. Run changelog validation without Hadrian.

Because the lint-author job is now based on the .lint template directly,
we enhance it to allow Git to read from the runner-owned checkouts,
In the previously used .lint-params template, this permissions issue was
addressed via `chown`.

Closes #27521.

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
26a44fb0 by ARATA Mizuki at 2026-07-23T11:22:10-04:00
testsuite: Fix memory issues of doublex2_* and simd010

doublex2_* had reads from uninitialized memory.

simd010 had out-of-bounds array access.

Fixes #27544

- - - - -
4d798b17 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Eliminate STM_AWOKEN

It was used as nullary closure for the block_info.closure in the case of
a thread being awoken after an STM transaction.

However, while it was written, it was never read, so contributed nothing
to the behaviour. Furthermore, in the only place it was set (in
tryWakeupThread) the why_blocked was immediately overwritten by the
NotBlocked status, and the block_info was updated accordingly (by
appendToRunQueue).

So it didn't even serve a purpose of clarifying an intermediate state,
there really was no such intermediate state.

Cleaning this up will allow the BlockedOnSTM case to follow the same
pattern as the other why_blocked cases that do not use the block_info,
and in turn this reduces the number of different categories.

- - - - -
e1cece79 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Document that eventlog thread stop code ThreadBlocked is no longer used

It has not been used since GHC 7.0.x (2011). In 7.2 all the BlockedOn*
codes were added, and these were and are used instead of ThreadBlocked.

- - - - -
795db115 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a proper mapping to eventlog external thread stop status

That is the mapping from rts-internal codes, to the coes used in the
status field in the eventlog EVENT_STOP_THREAD event.

See issue #9003 for what goes wrong when we mess this up. In that
ticket, people note that we should really not require the internal
tso->why_blocked codes to leak into the external eventlog thread stop
codes. The same principle applies to the StgThreadReturnCode.

This change properly separates them, and explicitly maps between them
using a pair of (compact, constant) tables. These tables are pretty
small (with no alignment constraints) and will soon shrink so it seems
a sensible tradeoff.

We also introduce and use proper EVENT_STOP_THREAD constants in the
event log format header. Previously there was not specification in the
code for these (only in the docs): the values were encoded into the
conversion code.

This will allow us to renumber the internal why_blockd codes without
breaking the eventlog output.

- - - - -
6f1c8efa by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove unused tso->block_info.wakeup member

Presumably it was used once, but not now.

- - - - -
740b88a9 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Document StgTSOBlockInfo to say what cases use what members

In principle, tso->why_blocked is the tag for the StgTSOBlockInfo union,
so we should be able to say for each union member the why_blocked cases
that use that member.

- - - - -
5b92eae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a tso->block_info.mvar member and use it

in preference to the generic block_info.closure union member, with
casts.

The plan is that when we know what case we're in (via tso->why_blocked)
then we can always access the correct union member, and so we will only
need to access block_info.closure for generic cases where we don't know
or don't care.

- - - - -
d931715f by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a tso->block_info.unused member and use it

in preference to the generic block_info.closure union member, with
casts.

The plan is that when we know what case we're in (via tso->why_blocked)
then we can always access the correct union member, and so we will only
need to access block_info.closure for generic cases where we don't know
or don't care.

- - - - -
47e28ebb by Duncan Coutts at 2026-07-23T17:26:18-04:00
Avoid storing to tso->block_info.closure

In one case we can use a specific union member (.prev) instead. In
several cases the stores were in fact redundant because of subsequent
overwrites.

In scavengeTSO we replace setting tso->block_info.closure to a valid
closure, with an assertion that the block_info.unused is already set to
END_TSO_QUEUE which is a valid (static) closure.

- - - - -
96e4749d by Duncan Coutts at 2026-07-23T17:26:18-04:00
Renumber the tso->why_blocked constants

We can do this now because we have separated the internal values from
the external ones used in the eventlog.

This lets us put them back into a deliberate order and consolodate some
gaps.

More importantly, it is a prepation for a slightly more sophisticated
encoding.

- - - - -
8f62661c by Duncan Coutts at 2026-07-23T17:26:18-04:00
Define constants for the existing stg_threadStatuszh return codes

The stg_threadStatuszh reuses the internal tso->why_blocked codes but
also extends them with a couple previously magic values. This is awkward
since we need to know what those magic values are so we don't
accidentally use those values to mean something else. By pulling a
definition up to where the why_blocked codes are defined we will be able
to avoid mistakenly assining those codes some meaning (or just changing
the BlockedThreadComplete, BlockedThreadKilled code if necessary).

- - - - -
42c69ae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Extend the tso->why_blocked encoding to indicate block_info closures

We use some bit tricks to cheaply and generically test if a
tso->why_blocked tag implies that the corresponding tso->block_info will
contain a non-trivial valid closure (i.e. not just block_info.unused set
to END_TSO_QUEUE).

In particular we arrange for most why_blocked values to naturally have a
distinguishing bit, but for the BlockedOn{Read,Write,Delay} cases, they
can come in either non-closure or closure forms. We allow an additional
bit to distinguish these cases. The non-closure forms are only from
legacy I/O managers: select and win32-legacy. So this extra bit
mechanism will be able to be retired once the legacy I/O managers are
themselves retired.

This means in a few places we need to untag the why_blocked value before
inspecting it, but in most places we do not.

- - - - -
7c64632b by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use BlockInfoForceNonClosure in the select I/O manager

- - - - -
8fd7104a by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use BlockInfoForceNonClosure in the win32-legacy I/O manager

for the BlockedOn{Read,Write} since these use the non-heap allocated
StgAsyncIOResult.

- - - - -
e0da603b by Duncan Coutts at 2026-07-23T17:26:18-04:00
Enforce the why_blocked and block_info rules in checkTSO

We now check the cases wher IsBlockInfoClosure should hold, the cases
that are supposed to use block_info.unused == END_TSO_QUEUE, and which
cases are allowed to use BlockInfoForceNonClosure.

This partially enforces the use of why_blocked as a tag for the
block_info union. We could be stricter and check for the correct
expected info table for the closure cases.

- - - - -
1dd0f381 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use IsBlockInfoClosure to simplify several tests

In GC and generic traversal we need to know if we should look at the
block_info.closure or not. Now we can do just that using a cheap bit
test on the why_blocked tag.

This fixes issue 26717, where the problem was that some GC modes did not
know when to look at block_info.closure, because the poll I/O manager
uses a closure for BlockedOn{Read,Write} while the select I/O manager
uses a non-closure. Now this information is in the why_blocked tag
itself.

- - - - -
7a00ffbc by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove the now-unused scavengeTSOIOManager

The GC no longer has to delegate to the I/O manager, since it can use
IsBlockInfoClosure to decide things itself.

- - - - -
522a481f by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove duplicate assertion

- - - - -
0874d965 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Follow atomic access rules more consistently for tso->why_blocked

The rule is this:

store block_info *before* why_blocked
store why_blocked using store release

load why_blocked using load acquire
load block_info *after* why_blocked

This is a an atomic store release / load acquire pair and (if the reads
are in a separate thread to the writes, and the read receives the value
stored) then this guarantees a full "happens before" relationship of
these stores and loads.

In some cases, we do not need a full load acquire, because we don't read
the block_info at all and so do not need any ordering. In this case we
just need an atomic relaxed load.

This was being followed in most places, but not all. If there's good
reason in any case that we don't need atomic access, then we should
document that in a comment. In the absence of that I think it's easier
to follow the rule everywhere.

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

- - - - -
4fdfe757 by Alan Zimmerman at 2026-07-23T17:27:06-04:00
EPA: Keep decls together in ClassDecl

Similar to 1718230f4d3d19d8c49c0e5d496cb0fb6f399528 for HsValBindsLR,
this commit updates ClassDecl so that it no longer splits out the
assorted `LHsDecl GhcPs` until the renamer.

It does this by inserting a type family (separate from the classic TTG one) for this.

So

data TyClDecl
  ...
  | ClassDecl {
    ...
       tcdDecls   :: XClassDecls pass

with

type instance XClassDecls GhcPs = [LHsDecl GhcPs]
type instance XClassDecls GhcRn = ClassDeclX GhcRn
type instance XClassDecls GhcTc = ClassDeclX GhcTc

data ClassDeclX pass
  = ClassDeclX { tcdSigs    :: [LSig pass],              -- ^ Methods' signatures
                 tcdMeths   :: LHsBinds pass,            -- ^ Default methods
                 tcdATs     :: [LFamilyDecl pass],       -- ^ Associated types;
                 tcdATDefs  :: [LTyFamDefltDecl pass],   -- ^ Associated type defaults
                 tcdDocs    :: [LDocDecl pass]           -- ^ Haddock docs
    }

- - - - -
f586c885 by Simon Jakobi at 2026-07-24T18:05:00-04:00
ci: Use shallow submodule clones by default

Limit submodule clones to depth one to reduce CI checkout costs. Keep
fetching full submodule history for the submodule lint jobs, which
inspect commits across a range.

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
306120d2 by Duncan Coutts at 2026-07-24T18:05:43-04:00
Fix flaky test T3994 on FreeBSD

On current FreeBSD versions, calling getpgid on a zombie process fails.
In T3994, if we're really unlucky with delays and scheduling then we can
end up in exactly that situation.

Just catch that specific exception and ignore it. It's rare, and not our
fault.

- - - - -
7b116a0b by Cheng Shao at 2026-07-24T18:06:24-04:00
ci: add missing workaround for docker permissions in lint jobs

Some lint jobs use ci-images with default user `ghc`, and the gitlab
ci docker executor requires the `sudo chown` workaround to fix
workspace directory permission issue. This patch adds the missing
workarounds for the lint jobs. Fixes #27554.

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

- - - - -
815149f3 by Andrzej Rybczak at 2026-07-25T15:06:43+00:00
Add -Wdefaulted-callstack

Adds a new warning, -Wdefaulted-callstack, which warns when an implicit
CallStack parameter is defaulted to the empty stack. In particular, this
includes call sites where a function with a HasCallStack constraint is called
from a definition that does *not* provide one. At such call sites the call stack
is cut off and does not include the enclosing definition's callers, which can be
a source of surprise if the user wants complete call stacks.

Closes #27077.

- - - - -
f6f2343f by Zubin Duggal at 2026-07-25T17:40:51-04:00
UniqueDFM: alter should preserve insertion order

Before it always inserting new elements at the end.
This is problematic because instances get inserted into the map with
`alterF`, which can change ordering of how instances are printed
with `:info` depending on the order in which we consult interfaces

I expect `alter id k = id` and `alter (fmap f) k = adjust f k`. Moving keys to
the end breaks that (`adjust` already preserves position).

Fixes #27532

- - - - -
5d0ab71a by fendor at 2026-07-27T17:31:05-04:00
Introduce global unit database cache

As a first step for better sharing of `UnitInfo` across `UnitEnv`,
we introduce a new datatype called `ExternalUnitDatabases`.

It primarily serves as an in-memory representation of *all*
`UnitDatabase`s across `UnitEnv`. This means, if multiple `HomeUnitEnv`s
depend on the same database, one way or another, we make sure that we
don't parse from disk every time.
Instead, we store the in-memory representation in `ExternalUnitDatabases`.

`ExternalUnitDatabaseCache` is the equivalent of `ExternalUnitState` in
the `UnitEnv`. It is a mutable variable wrapping `ExternalUnitDatabases`.

The mutable `ExternalUnitDatabaseCache` is used in `initUnits` to make
sure we don't parse the same unit database multiple times.

Almost by accident, we change the semantics of `initUnits` to honour
modifications to `packageDBFlags`.
The inability to change `packageDBFlags` while also reusing the already
parsed `UnitDatabase`s was reported in #26423 as a bug.
Hence, we think this behaviour change is warranted and acceptable,
especially since it comes with a breaking change to the `initUnits` API.

Add regression test for #26423
Closes #26423

- - - - -
6cce494a by fendor at 2026-07-27T17:31:05-04:00
Introduce UnitIndex for global external unit caching

`UnitInfo`s have been observed to cause a lot of memory usage in #27500.
Especially with multiple home units, as the same (external) units are
processed from scratch, even though most of the time we end up with
exactly the same `UnitInfo`.

We introduce a `UnitEnv` global cache that allows us to store external
unit information that is used across all `HomeUnitEnv`s.

The most important change in this commit is the introduction of the `UnitIndex`.
It stores a global mapping of `UnitId` -> `UnitInfo`, and `initUnits`
always uses the cached `UnitInfo` entry to populate each
`HomeUnitEnv`'s `UnitState`.
This allows us to ensure the following property:
...
Each `UnitInfo` should be alive exactly once in GHC.
All `UnitState`s should reference 'UnitInfo's stored in the 'UnitIndex'.
This ensured by calling 'initUnits' with the 'UnitIndex'.

In addition, the `ExternalUnitDatabases` may also hold a reference
to each on-disk representation of `UnitInfo`.

This means, we impose an hard upper bound on the number of `UnitInfo`s
alive in the GHC session:
...
The number of alive `UnitInfo`s closure objects must be the
sum of all loaded unit database times two.
We add performance regression tests that make sure the number of live
`UnitInfo` cannot exceed this threshold.

Closes #27500

-------------------------
Metric Decrease:
    MultiComponentModules
    MultiComponentModulesRecomp
    MultiComponentModulesRecomp100
    mhu-perf
    LinkableUsage02
-------------------------

These metrics increases are especially notable, as we are not even
sharing anything big but merely the global package database with 50
entries.
It shows how careful sharing of `UnitInfo` can improve memory usage.
We expect this to be much more notable when the whole cabal package
database is shared across multiple home units.

`LinkableUsage02` metric decreases on unreg and i386 platform, only.

---

Technical details

To share the `UnitInfo`s correctly, it is important that we extract
the `WireMap` into the `UnitIndex`. At the moment of writing, `WireMap`
must be globally the same for all `HomeUnitEnv`s.
This is important, as we could otherwise not cache the "fully-resolved"
`UnitInfo`, as we don't change the `UnitId` or `unitAbiHash` when
resolving wired-in units. Thus, there could be ambiguities, when the
`WireMap` is not the same for all `UnitState`s across the `UnitEnv`.

We consider a `UnitInfo` fully-resolved, if wired-in units have been
updated, the `UnitInfo` has been validated and variables in the unit
config, such as `${pkgroot}` have been resolved.

Updating the wired-in units requires the `WireMap` to be globally the
same.

- - - - -
f8e3bee9 by Zubin Duggal at 2026-07-27T17:31:49-04:00
testsuite: skip runtime stats tests on debugged compilers

Debugged flavours build the boot libraries without optimisation, so the
runtime numbers do not match the baselines.

- - - - -
1e326770 by Zubin Duggal at 2026-07-27T17:31:50-04:00
testsuite: mark #20706 tests fragile rather than broken

Whether the static linux linker issues manifest depends on the host
toolchain.

- - - - -
c0b13cbe by Zubin Duggal at 2026-07-27T17:31:50-04:00
testsuite: exclude libnuma from mostly-static

It needs static system libraries (libnuma.a) that many platforms do not
ship.

Fixes #26914

- - - - -
bee1913d by Alan Zimmerman at 2026-07-28T16:42:29-04:00
EPA: ClsInstDecl with decls as [LHsDecl GhcPs] in GhcPs

Similar to 4fdfe75731e01dad7d7fa474c2703d0d3965afb1, this commit
changes the as-parsed representation of class instance declarations to
[LHsDecl GhcPs], and only separates them by type from the renamer onward.

This also allows us to remove all the AnnSortKey machinery for exact
printing, as it is now no longer needed.

- - - - -
72c55eee by Cheng Shao at 2026-07-28T16:43:11-04:00
hadrian: implement and use writeFileAtomic to fix race condition

This patch implements `writeFileAtomic` in hadrian and change all
invocations of shake non-atomic `writeFile'` to use `writeFileAtomic`,
to avoid multiple hadrian concurrent invocations overwriting the same
in-tree generated file not in the build root directory. Fixes #27536.
Additional notes:

- `writeFileChanged`/`writeFileChangedBS` cannot be made atomic since
  it involves reading the file's older version, so their uses are left
  alone. It doesn't affect #27536 given their outputs are contained in
  the build root directory.
- It's possible to shrink this patch by only making writes outside the
  build root directory atomic. But I think it's not worth the effort
  for fine grained distinction here, and atomic writes within the
  build root directory should also improve robustness of a hadrian
  build.
- In the longer term we do want to make a ghc build only generate
  files within the build root directory, though that's a lot of work
  and outside the scope of this particular bugfix.

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

- - - - -
46d4f963 by Sylvain Henry at 2026-07-29T06:38:40-04:00
RTS: correctly mark slop bytes when shrinking large arrays (#19048)

Correctly mark slop bytes even when profiling is off so that heap census
doesn't traverse garbage-collected closures.

- - - - -
4762a8bf by Simon Jakobi at 2026-07-29T06:39:23-04:00
Add -XLazyFieldAnnotations (GHC proposal 752)

Unbundle the prefix `~` lazy field annotation syntax from StrictData. The
new LazyFieldAnnotations extension controls whether `~` is accepted on
constructor fields. StrictData (and Strict, transitively) imply the new
extension.

See https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0752-la....

Closes #24455.

Assisted-by: Claude Opus 4.8

- - - - -
0b6dcc84 by Simon Jakobi at 2026-07-29T06:40:04-04:00
testsuite: Relax T24471 residency tolerance

T24471 peak residency fluctuates enough on i386 to cause spurious
failures. Use the standard residency tolerance while retaining the
existing allocation threshold.

See https://gitlab.haskell.org/ghc/ghc/-/work_items/24471#note_682303.

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
90e95b34 by Cheng Shao at 2026-07-29T06:40:45-04:00
compiler: fix missing top-level procedure labels in cmm dumps

This patch fixes missing top-level procedure labels in some
intermediate Cmm pass dumps. Fixes #27553.

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

- - - - -
360a5946 by sheaf at 2026-07-29T06:41:35-04:00
Add some type-family-heavy performance tests

FamAppCachePerf stress-tests the performance of lookups in the
type family application cache.

T27336 is a minimisation extracted from the reported reproducer.

SimplCastPerf is a measure of coercion growth due to the simplifier
calling mkTransCo without re-optimising the result.

- - - - -
3ec9e2b9 by Mike Pilgrem at 2026-07-31T08:21:33-04:00
GHC Guide: Improve docs on response files

- - - - -
e5b2a1f7 by sheaf at 2026-07-31T08:22:23-04:00
Disable Core Lint for TcPlugin_RewritePerf

This is a compiler performance test, but the test source hard-coded
-dcore-lint, defeating the measurement.

-------------------------
Metric Decrease:
    TcPlugin_RewritePerf
-------------------------

- - - - -
85b10c00 by Alan Zimmerman at 2026-07-31T22:09:47+01:00
EPA: Remove LocatedP from OverlapMode

We have

  type LocatedP = GenLocated SrcSpanAnnP
  type SrcSpanAnnP = EpAnn AnnPragma

As the first step in removing this in favour of LocatedA which only
captures location, comments and trailing annotations, we remove it
from OverlapMode

We do this by moving the AnnPragma into the TTG extension point
instead.

- - - - -
c9a34a00 by Viktor Dukhovni at 2026-08-02T04:34:17-04:00
Fix note typo

- - - - -
4f2a21f7 by Andreas Klebinger at 2026-08-02T22:46:46-04:00
Apply oneShot Monad trick to STG LintM

- - - - -
21e4b89d by Andreas Klebinger at 2026-08-02T22:46:46-04:00
stgLint: Use a single reader env for read only arguments.

- - - - -
d415f38a by Alan Zimmerman at 2026-08-02T22:47:27-04:00
EPA: Remove LocatedP from CType

The next step of removing use of LocatedP by moving
the AnnPragma for CType into its TTG extension point
instead.

- - - - -
5379e154 by Zubin Duggal at 2026-08-04T11:37:40+02:00
hie files: Also dump the type table when dumping with -ddump-hie

- - - - -
5d626640 by Zubin Duggal at 2026-08-04T11:40:25+02:00
hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast

Fixes #25709

- - - - -
3415f4ef by fendor at 2026-08-04T11:43:27+02:00
fixup! hie files: Also dump the type table when dumping with -ddump-hie

- - - - -
c420ccbc by fendor at 2026-08-04T16:57:03+02:00
WIP: test case for quantified constraints

- - - - -

4431 changed files:

- .gitattributes
- .gitignore
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/common.sh
- .gitlab/darwin/nix/sources.json
- .gitlab/darwin/toolchain.nix
- + .gitlab/generate-ci/cabal.project
- .gitlab/generate-ci/flake.lock
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/issue_templates/default.md
- + .gitlab/issue_templates/get-verified.md
- + .gitlab/issue_templates/release_tracking.md
- .gitlab/jobs.yaml
- .gitlab/merge_request_templates/Default.md
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- .gitlab/rel_eng/upload_ghc_libs.py
- .gitlab/test-metrics.sh
- .gitmodules
- .mailmap
- CODEOWNERS
- README.md
- boot
- cabal.project-reinstall
- + changelog.d/21101
- + changelog.d/26616
- + changelog.d/27380
- + changelog.d/27532
- + changelog.d/AbstractQ
- + changelog.d/T15973
- + changelog.d/T17833
- + changelog.d/T19174.md
- + changelog.d/T21176
- + changelog.d/T21628
- + changelog.d/T25636
- + changelog.d/T26423
- + changelog.d/T26532
- + changelog.d/T26716
- + changelog.d/T26978
- + changelog.d/T26979
- + changelog.d/T27022
- + changelog.d/T27046
- + changelog.d/T27047
- + changelog.d/T27121.md
- + changelog.d/T27123.md
- + changelog.d/T27124.md
- + changelog.d/T27131
- + changelog.d/T27182.md
- + changelog.d/T27202
- + changelog.d/T27225
- + changelog.d/T27261
- + changelog.d/T27308
- + changelog.d/T27314.md
- + changelog.d/T27317
- + changelog.d/T27329
- + changelog.d/T27359
- + changelog.d/T27360
- + changelog.d/T27374
- + changelog.d/T27386
- + changelog.d/T27456
- + changelog.d/add_can_drop_to_occurence_analyser
- + changelog.d/binary-array-no-list
- + changelog.d/bump-process
- + changelog.d/bytecode-interpreter-hpc-support
- + changelog.d/changelog-entries
- + changelog.d/cmm-import-syntax-changes
- + changelog.d/config
- + changelog.d/deterministic-usage-order
- + changelog.d/dynamic-trace-flags
- + changelog.d/elem-via-foldr-27096
- + changelog.d/fix-absent-dict-projection
- + changelog.d/fix-blackhole-handling
- + changelog.d/fix-cmm-atomic-load-store
- + changelog.d/fix-cmm-dump-labels
- + changelog.d/fix-compacting-gc-ap-27434
- + changelog.d/fix-duplicate-pmc-warnings
- + changelog.d/fix-exponential-case-desugar-27383
- + changelog.d/fix-finalizers-27072
- + changelog.d/fix-ghci-duplicate-warnings-26233
- + changelog.d/fix-heap-census-large-arrays-19048
- + changelog.d/fix-layout-stack-fcall
- + changelog.d/fix-make-install-j
- + changelog.d/fix-peekitbl-no-tntc
- + changelog.d/fix-plugin-finder-multi-home-unit.md
- + changelog.d/fix-unreg
- + changelog.d/fix-use-std-ap-thunk
- + changelog.d/generically-mconcat
- + changelog.d/ghc-api-epa-parens
- + changelog.d/ghc-api-holes-ast-27111
- + changelog.d/ghc-api-namespace-specifier-26678
- + changelog.d/ghc-pkg-faster-closure
- + changelog.d/ghc-pkg-long-path-support
- + changelog.d/hadrian-response-files.md
- + changelog.d/hadrian-stale-package-confs-26661
- + changelog.d/hadrian-system-cxx-std-lib-25303
- + changelog.d/hadrian-warn-missing-package-index-16484
- + changelog.d/inter-module-far-jumps-aarch64-default
- + changelog.d/interactive-error-hints
- + changelog.d/ipe-event-class
- + changelog.d/jobserver-leak-fix
- + changelog.d/lazy-field-annotations
- + changelog.d/lib-add-tuple-tyfam-27179
- + changelog.d/libdir-setting
- + changelog.d/llvm-22
- + changelog.d/module-graph-reuse-in-downsweep
- + changelog.d/more-efficient-home-unit-imports-finding
- + changelog.d/no-more-timer-signal
- + changelog.d/pp-set-ghc-version
- + changelog.d/reexported-module-errors
- + changelog.d/remove-bignum-check-backend
- + changelog.d/remove-bignum-ffi-backend
- + changelog.d/remove-ddump-json-flag
- + changelog.d/rts_symlinks.md
- + changelog.d/semaphore-v2
- + changelog.d/simd_constant_folding
- + changelog.d/skip-test
- + changelog.d/so_inline_is_a_predicate
- + changelog.d/stable-core-dump-order-27296
- + changelog.d/stage2-cross-compilers
- + changelog.d/tag-inference-27005
- + changelog.d/tcplugin_init.md
- + changelog.d/tcplugins-pmc.md
- + changelog.d/tool-messages-27370
- + changelog.d/typecheckModule-API.md
- + changelog.d/unit-index
- + changelog.d/unused-type
- + changelog.d/warn-defaulted-callstack
- + changelog.d/wasm-fix-serviceworker
- + changelog.d/windows-rethrow-overlapped-exception
- + changelog.d/withTcPlugins.md
- compile_flags.txt
- compiler/.hlint.yaml
- compiler/CodeGen.Platform.h
- compiler/GHC.hs
- compiler/GHC/Builtin/Names.hs
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- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/PrimOps/Ids.hs
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/Types/Literals.hs
- compiler/GHC/Builtin/Types/Prim.hs
- compiler/GHC/Builtin/Uniques.hs
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- + compiler/GHC/ByteCode/Binary.hs
- + compiler/GHC/ByteCode/Breakpoints.hs
- compiler/GHC/ByteCode/InfoTable.hs
- compiler/GHC/ByteCode/Instr.hs
- compiler/GHC/ByteCode/Linker.hs
- + compiler/GHC/ByteCode/Recomp/Binary.hs
- + compiler/GHC/ByteCode/Serialize.hs
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- compiler/GHC/Cmm/ContFlowOpt.hs
- compiler/GHC/Cmm/Dataflow.hs
- compiler/GHC/Cmm/Dataflow/Block.hs
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- compiler/GHC/Cmm/Dataflow/Label.hs
- compiler/GHC/Cmm/DebugBlock.hs
- compiler/GHC/Cmm/Dominators.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/Graph.hs
- compiler/GHC/Cmm/Info.hs
- compiler/GHC/Cmm/Info/Build.hs
- compiler/GHC/Cmm/InitFini.hs
- compiler/GHC/Cmm/LRegSet.hs
- compiler/GHC/Cmm/LayoutStack.hs
- compiler/GHC/Cmm/Lexer.x
- compiler/GHC/Cmm/Lint.hs
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- compiler/GHC/Cmm/MachOp.hs
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- compiler/GHC/Cmm/Parser.y
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- compiler/GHC/Cmm/ProcPoint.hs
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- compiler/GHC/Cmm/Switch.hs
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- compiler/GHC/Cmm/ThreadSanitizer.hs
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- compiler/GHC/CmmToAsm/AArch64/RegInfo.hs
- compiler/GHC/CmmToAsm/AArch64/Regs.hs
- compiler/GHC/CmmToAsm/BlockLayout.hs
- compiler/GHC/CmmToAsm/CFG.hs
- compiler/GHC/CmmToAsm/CPrim.hs
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- compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs
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- compiler/GHC/CmmToAsm/Reg/Linear.hs
- compiler/GHC/CmmToAsm/Reg/Linear/Base.hs
- compiler/GHC/CmmToAsm/Reg/Linear/FreeRegs.hs
- compiler/GHC/CmmToAsm/Reg/Linear/JoinToTargets.hs
- compiler/GHC/CmmToAsm/Reg/Linear/StackMap.hs
- compiler/GHC/CmmToAsm/Reg/Linear/State.hs
- compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
- compiler/GHC/CmmToAsm/Reg/Linear/X86_64.hs
- compiler/GHC/CmmToAsm/Reg/Liveness.hs
- + compiler/GHC/CmmToAsm/Reg/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Target.hs
- compiler/GHC/CmmToAsm/Wasm.hs
- compiler/GHC/CmmToAsm/Wasm/Asm.hs
- compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
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- compiler/GHC/CmmToAsm/X86/CodeGen.hs
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- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm.hs
- compiler/GHC/CmmToLlvm/Base.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
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- compiler/GHC/CmmToLlvm/Data.hs
- compiler/GHC/CmmToLlvm/Mangler.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Class.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion.hs-boot
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- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/ConLike.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/DataCon.hs-boot
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/InstEnv.hs
- compiler/GHC/Core/LateCC/OverloadedCalls.hs
- compiler/GHC/Core/LateCC/TopLevelBinds.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Lint/Interactive.hs
- + compiler/GHC/Core/Lint/SubstTypeLets.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Map/Expr.hs
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/CSE.hs
- compiler/GHC/Core/Opt/CallArity.hs
- compiler/GHC/Core/Opt/CallerCC.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/CprAnal.hs
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- compiler/GHC/Core/Opt/FloatIn.hs
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- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Pipeline.hs
- compiler/GHC/Core/Opt/Pipeline/Types.hs
- + compiler/GHC/Core/Opt/Range.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Inline.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/Simplify/Monad.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/WorkWrap.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/PatSyn.hs
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- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/Reduction.hs
- compiler/GHC/Core/RoughMap.hs
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- compiler/GHC/Core/Rules/Config.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
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- compiler/GHC/Core/TyCo/Compare.hs
- compiler/GHC/Core/TyCo/FVs.hs
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- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCo/Tidy.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/TyCon/Env.hs
- compiler/GHC/Core/TyCon/RecWalk.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Type.hs-boot
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unfold/Make.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToStg.hs
- + compiler/GHC/CoreToStg/AddImplicitBinds.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/Bag.hs
- compiler/GHC/Data/BooleanFormula.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Data/FastString/Env.hs
- compiler/GHC/Data/FlatBag.hs
- compiler/GHC/Data/Graph/Collapse.hs
- compiler/GHC/Data/Graph/Color.hs
- compiler/GHC/Data/Graph/Directed.hs
- compiler/GHC/Data/IOEnv.hs
- compiler/GHC/Data/List/Infinite.hs
- compiler/GHC/Data/List/NonEmpty.hs
- compiler/GHC/Data/List/SetOps.hs
- compiler/GHC/Data/Maybe.hs
- compiler/GHC/Data/OsPath.hs
- compiler/GHC/Data/Pair.hs
- compiler/GHC/Data/Stream.hs
- compiler/GHC/Data/Strict.hs
- compiler/GHC/Data/StringBuffer.hs
- compiler/GHC/Data/TrieMap.hs
- compiler/GHC/Data/Word64Map.hs
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Map/Lazy.hs
- compiler/GHC/Data/Word64Map/Strict.hs
- compiler/GHC/Data/Word64Map/Strict/Internal.hs
- compiler/GHC/Driver/Backend.hs
- compiler/GHC/Driver/Backend/Internal.hs
- compiler/GHC/Driver/Backpack.hs
- + compiler/GHC/Driver/ByteCode.hs
- compiler/GHC/Driver/CmdLine.hs
- compiler/GHC/Driver/CodeOutput.hs
- compiler/GHC/Driver/Config.hs
- compiler/GHC/Driver/Config/CmmToAsm.hs
- compiler/GHC/Driver/Config/CmmToLlvm.hs
- compiler/GHC/Driver/Config/Core/Lint.hs
- compiler/GHC/Driver/Config/Core/Lint/Interactive.hs
- compiler/GHC/Driver/Config/Core/Opt/Simplify.hs
- compiler/GHC/Driver/Config/Core/Rules.hs
- compiler/GHC/Driver/Config/Finder.hs
- + compiler/GHC/Driver/Config/Interpreter.hs
- compiler/GHC/Driver/Config/Linker.hs
- compiler/GHC/Driver/Config/Stg/Debug.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Driver/Config/Tidy.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Driver/Env/KnotVars.hs
- compiler/GHC/Driver/Env/Types.hs
- compiler/GHC/Driver/Errors.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/GenerateCgIPEStub.hs
- compiler/GHC/Driver/Hooks.hs
- compiler/GHC/Driver/LlvmConfigCache.hs
- compiler/GHC/Driver/Main.hs
- + compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot
- + compiler/GHC/Driver/Main/Hsc.hs
- + compiler/GHC/Driver/Main/Interactive.hs
- + compiler/GHC/Driver/Main/Passes.hs
- + compiler/GHC/Driver/Main/Passes.hs-boot
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeAction.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/MakeSem.hs
- compiler/GHC/Driver/Messager.hs
- compiler/GHC/Driver/Monad.hs
- compiler/GHC/Driver/Phases.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Pipeline/LogQueue.hs
- compiler/GHC/Driver/Pipeline/Monad.hs
- compiler/GHC/Driver/Pipeline/Phases.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Driver/Session.hs
- + compiler/GHC/Driver/Session/Inspect.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs.hs
- compiler/GHC/Hs/Basic.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- + compiler/GHC/Hs/Decls/Overlap.hs
- compiler/GHC/Hs/Doc.hs
- − compiler/GHC/Hs/Doc.hs-boot
- compiler/GHC/Hs/DocString.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Expr.hs-boot
- compiler/GHC/Hs/Extension.hs
- + compiler/GHC/Hs/Extension/Pass.hs
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Pat.hs-boot
- − compiler/GHC/Hs/Specificity.hs
- compiler/GHC/Hs/Stats.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Arrows.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Breakpoints.hs
- + compiler/GHC/HsToCore/Breakpoints/Types.hs
- compiler/GHC/HsToCore/Coverage.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Errors/Ppr.hs
- compiler/GHC/HsToCore/Errors/Types.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Foreign/C.hs
- compiler/GHC/HsToCore/Foreign/Call.hs
- compiler/GHC/HsToCore/Foreign/Decl.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.hs
- compiler/GHC/HsToCore/Foreign/Utils.hs
- compiler/GHC/HsToCore/Foreign/Wasm.hs
- compiler/GHC/HsToCore/GuardedRHSs.hs
- compiler/GHC/HsToCore/ListComp.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match.hs-boot
- compiler/GHC/HsToCore/Match/Constructor.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Pmc/Check.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Ppr.hs
- compiler/GHC/HsToCore/Pmc/Solver.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Pmc/Types.hs
- compiler/GHC/HsToCore/Pmc/Utils.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Decl.hs
- compiler/GHC/Iface/Env.hs
- compiler/GHC/Iface/Errors.hs
- compiler/GHC/Iface/Errors/Ppr.hs
- compiler/GHC/Iface/Errors/Types.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Binary.hs
- compiler/GHC/Iface/Ext/Debug.hs
- compiler/GHC/Iface/Ext/Types.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Flags.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Recomp/Flags.hs
- compiler/GHC/Iface/Recomp/Types.hs
- compiler/GHC/Iface/Rename.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/Iface/Warnings.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/JS/Ident.hs
- compiler/GHC/JS/JStg/Monad.hs
- compiler/GHC/JS/JStg/Syntax.hs
- compiler/GHC/JS/Make.hs
- compiler/GHC/JS/Optimizer.hs
- compiler/GHC/JS/Ppr.hs
- compiler/GHC/JS/Syntax.hs
- compiler/GHC/JS/Transform.hs
- + compiler/GHC/Linker/ByteCode.hs
- compiler/GHC/Linker/Config.hs
- compiler/GHC/Linker/Deps.hs
- compiler/GHC/Linker/Dynamic.hs
- + compiler/GHC/Linker/Executable.hs
- − compiler/GHC/Linker/ExtraObj.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Linker/MacOS.hs
- compiler/GHC/Linker/Static.hs
- compiler/GHC/Linker/Types.hs
- compiler/GHC/Linker/Unit.hs
- compiler/GHC/Linker/Windows.hs
- compiler/GHC/Llvm/MetaData.hs
- compiler/GHC/Llvm/Ppr.hs
- compiler/GHC/Llvm/Types.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/Errors/Basic.hs
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/HaddockLex.x
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/Lexer/String.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Parser/String.hs
- compiler/GHC/Parser/Types.hs
- compiler/GHC/Platform.hs
- compiler/GHC/Platform/Reg.hs
- compiler/GHC/Platform/Reg/Class.hs
- compiler/GHC/Platform/Reg/Class/NoVectors.hs
- compiler/GHC/Platform/Reg/Class/Separate.hs
- compiler/GHC/Platform/Reg/Class/Unified.hs
- + compiler/GHC/Platform/Tag.hs
- compiler/GHC/Platform/Ways.hs
- compiler/GHC/Plugins.hs
- compiler/GHC/Prelude/Basic.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Doc.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/Expr.hs-boot
- compiler/GHC/Rename/Fixity.hs
- compiler/GHC/Rename/HsType.hs
- + compiler/GHC/Rename/Lit.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Rename/Splice.hs-boot
- compiler/GHC/Rename/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Debugger.hs
- compiler/GHC/Runtime/Debugger/Breakpoints.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Eval/Types.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Heap/Layout.hs
- compiler/GHC/Runtime/Interpreter.hs
- + compiler/GHC/Runtime/Interpreter/C.hs
- + compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Process.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Interpreter/Types/SymbolCache.hs
- compiler/GHC/Runtime/Interpreter/Wasm.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Settings.hs
- compiler/GHC/Settings/Constants.hs
- compiler/GHC/Settings/IO.hs
- compiler/GHC/Stg/BcPrep.hs
- compiler/GHC/Stg/Debug.hs
- + compiler/GHC/Stg/Debug/Types.hs
- compiler/GHC/Stg/EnforceEpt.hs
- compiler/GHC/Stg/EnforceEpt/Rewrite.hs
- compiler/GHC/Stg/EnforceEpt/TagSig.hs
- compiler/GHC/Stg/EnforceEpt/Types.hs
- compiler/GHC/Stg/FVs.hs
- compiler/GHC/Stg/Lift/Analysis.hs
- compiler/GHC/Stg/Lift/Monad.hs
- compiler/GHC/Stg/Lift/Types.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Syntax.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/Stg/Utils.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm.hs
- compiler/GHC/StgToCmm/ArgRep.hs
- compiler/GHC/StgToCmm/Bind.hs
- compiler/GHC/StgToCmm/CgUtils.hs
- compiler/GHC/StgToCmm/Closure.hs
- compiler/GHC/StgToCmm/Config.hs
- compiler/GHC/StgToCmm/DataCon.hs
- compiler/GHC/StgToCmm/Env.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/ExtCode.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Heap.hs
- compiler/GHC/StgToCmm/InfoTableProv.hs
- compiler/GHC/StgToCmm/Layout.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Monad.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToCmm/Prof.hs
- compiler/GHC/StgToCmm/Ticky.hs
- compiler/GHC/StgToCmm/Utils.hs
- compiler/GHC/StgToJS/Apply.hs
- compiler/GHC/StgToJS/Arg.hs
- compiler/GHC/StgToJS/CodeGen.hs
- compiler/GHC/StgToJS/DataCon.hs
- compiler/GHC/StgToJS/Deps.hs
- compiler/GHC/StgToJS/Expr.hs
- compiler/GHC/StgToJS/ExprCtx.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Heap.hs
- compiler/GHC/StgToJS/Ids.hs
- compiler/GHC/StgToJS/Linker/Linker.hs
- compiler/GHC/StgToJS/Linker/Opt.hs
- compiler/GHC/StgToJS/Linker/Types.hs
- compiler/GHC/StgToJS/Linker/Utils.hs
- compiler/GHC/StgToJS/Literal.hs
- compiler/GHC/StgToJS/Monad.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/StgToJS/Regs.hs
- compiler/GHC/StgToJS/Rts/Rts.hs
- compiler/GHC/StgToJS/Rts/Types.hs
- compiler/GHC/StgToJS/Sinker/Collect.hs
- compiler/GHC/StgToJS/Sinker/Sinker.hs
- compiler/GHC/StgToJS/Sinker/StringsUnfloat.hs
- compiler/GHC/StgToJS/StaticPtr.hs
- compiler/GHC/StgToJS/Types.hs
- compiler/GHC/StgToJS/Utils.hs
- compiler/GHC/SysTools.hs
- compiler/GHC/SysTools/Ar.hs
- compiler/GHC/SysTools/BaseDir.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/GHC/SysTools/Process.hs
- compiler/GHC/SysTools/Tasks.hs
- compiler/GHC/SysTools/Terminal.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Functor.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Deriv/Infer.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Hole.hs
- compiler/GHC/Tc/Errors/Hole/FitTypes.hs
- compiler/GHC/Tc/Errors/Hole/Plugin.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Errors/Types/PromotionErr.hs
- compiler/GHC/Tc/Gen/Annotation.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Arrow.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/Do.hs
- + compiler/GHC/Tc/Gen/Expand.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Expr.hs-boot
- compiler/GHC/Tc/Gen/Foreign.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Match.hs-boot
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Gen/Splice.hs-boot
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Instance/Typeable.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/Equality.hs
- + compiler/GHC/Tc/Solver/FunDeps.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Irred.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Solver/Rewrite.hs
- compiler/GHC/Tc/Solver/Solve.hs
- + compiler/GHC/Tc/Solver/Solve.hs-boot
- compiler/GHC/Tc/Solver/Types.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/TyCl/Class.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/BasicTypes.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/CtLoc.hs
- compiler/GHC/Tc/Types/ErrCtxt.hs
- − compiler/GHC/Tc/Types/EvTerm.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/LclEnv.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Types/Origin.hs-boot
- compiler/GHC/Tc/Types/Rank.hs
- compiler/GHC/Tc/Types/TH.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/Concrete.hs
- compiler/GHC/Tc/Utils/Env.hs
- compiler/GHC/Tc/Utils/Instantiate.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- − compiler/GHC/Tc/Utils/TcMType.hs-boot
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/TcType.hs-boot
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Utils/Unify.hs-boot
- compiler/GHC/Tc/Validity.hs
- compiler/GHC/Tc/Zonk/Monad.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Annotations.hs
- + compiler/GHC/Types/Arity.hs
- compiler/GHC/Types/Avail.hs
- compiler/GHC/Types/Basic.hs
- − compiler/GHC/Types/Breakpoint.hs
- compiler/GHC/Types/CompleteMatch.hs
- compiler/GHC/Types/CostCentre.hs
- compiler/GHC/Types/CostCentre/State.hs
- compiler/GHC/Types/DefaultEnv.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Error.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/FieldLabel.hs
- compiler/GHC/Types/Fixity.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/ForeignStubs.hs
- compiler/GHC/Types/GREInfo.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/HpcInfo.hs
- compiler/GHC/Types/Id.hs
- compiler/GHC/Types/Id/Info.hs
- compiler/GHC/Types/Id/Make.hs
- + compiler/GHC/Types/InlinePragma.hs
- compiler/GHC/Types/Literal.hs
- + compiler/GHC/Types/Literal/Floating.hs
- compiler/GHC/Types/Name.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Env.hs
- compiler/GHC/Types/Name/Occurrence.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/Name/Set.hs
- compiler/GHC/Types/PkgQual.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/SaneDouble.hs
- compiler/GHC/Types/SourceError.hs
- compiler/GHC/Types/SourceText.hs
- compiler/GHC/Types/SptEntry.hs
- compiler/GHC/Types/SrcLoc.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/TyThing.hs
- compiler/GHC/Types/TyThing/Ppr.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Types/Unique/DSM.hs
- compiler/GHC/Types/Unique/DSet.hs
- compiler/GHC/Types/Unique/FM.hs
- compiler/GHC/Types/Unique/Map.hs
- compiler/GHC/Types/Unique/SDFM.hs
- compiler/GHC/Types/Unique/Set.hs
- compiler/GHC/Types/Unique/Supply.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Types/Var.hs-boot
- compiler/GHC/Types/Var/Env.hs
- + compiler/GHC/Types/Var/FV.hs
- compiler/GHC/Types/Var/Set.hs
- compiler/GHC/Unit.hs
- compiler/GHC/Unit/Env.hs
- + compiler/GHC/Unit/External/Database.hs
- + compiler/GHC/Unit/External/Index.hs
- + compiler/GHC/Unit/External/ModuleOrigin.hs
- + compiler/GHC/Unit/External/Providers.hs
- + compiler/GHC/Unit/External/Query.hs
- + compiler/GHC/Unit/External/Substitution.hs
- + compiler/GHC/Unit/External/Validate.hs
- + compiler/GHC/Unit/External/Visibility.hs
- + compiler/GHC/Unit/External/Wired.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Finder/Types.hs
- compiler/GHC/Unit/Home/Graph.hs
- compiler/GHC/Unit/Home/ModInfo.hs
- compiler/GHC/Unit/Home/PackageTable.hs
- compiler/GHC/Unit/Info.hs
- compiler/GHC/Unit/Module.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/Env.hs
- compiler/GHC/Unit/Module/Graph.hs
- compiler/GHC/Unit/Module/Location.hs
- compiler/GHC/Unit/Module/ModGuts.hs
- compiler/GHC/Unit/Module/ModIface.hs
- compiler/GHC/Unit/Module/ModSummary.hs
- compiler/GHC/Unit/Module/Status.hs
- compiler/GHC/Unit/Module/Warnings.hs
- compiler/GHC/Unit/Module/WholeCoreBindings.hs
- compiler/GHC/Unit/State.hs
- + compiler/GHC/Unit/State.hs-boot
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Unit/Types.hs-boot
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Binary/Typeable.hs
- + compiler/GHC/Utils/EndoOS.hs
- compiler/GHC/Utils/Error.hs
- compiler/GHC/Utils/Exception.hs
- − compiler/GHC/Utils/FV.hs
- compiler/GHC/Utils/Json.hs
- compiler/GHC/Utils/Logger.hs
- compiler/GHC/Utils/Misc.hs
- compiler/GHC/Utils/Monad.hs
- compiler/GHC/Utils/Monad/Codensity.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/GHC/Utils/Panic.hs
- compiler/GHC/Utils/Panic/Plain.hs
- compiler/GHC/Utils/Ppr.hs
- compiler/GHC/Utils/Trace.hs
- compiler/GHC/Wasm/ControlFlow.hs
- compiler/GHC/Wasm/ControlFlow/FromCmm.hs
- compiler/Language/Haskell/Syntax.hs
- compiler/Language/Haskell/Syntax/Basic.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- + compiler/Language/Haskell/Syntax/Binds/InlinePragma.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- + compiler/Language/Haskell/Syntax/Decls/Foreign.hs
- + compiler/Language/Haskell/Syntax/Decls/Overlap.hs
- + compiler/Language/Haskell/Syntax/Doc.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Expr.hs-boot
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/ImpExp.hs
- compiler/Language/Haskell/Syntax/Lit.hs
- compiler/Language/Haskell/Syntax/Module/Name.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Pat.hs-boot
- compiler/Language/Haskell/Syntax/Specificity.hs
- + compiler/Language/Haskell/Syntax/Text.hs
- compiler/Language/Haskell/Syntax/Type.hs
- − compiler/Language/Haskell/Syntax/Type.hs-boot
- compiler/Setup.hs
- compiler/cbits/keepCAFsForGHCi.c
- compiler/ghc.cabal.in
- config.guess
- config.sub
- configure.ac
- distrib/configure.ac.in
- − docs/Makefile
- − docs/storage-mgt/Makefile
- + docs/users_guide/10.2.1-notes.rst
- − docs/users_guide/9.14.1-notes.rst
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- docs/users_guide/bugs.rst
- docs/users_guide/compare-flags.py
- docs/users_guide/conf.py
- docs/users_guide/debug-info.rst
- docs/users_guide/debugging.rst
- + docs/users_guide/diagnostics-as-json-schema-1_2.json
- docs/users_guide/eventlog-formats.rst
- docs/users_guide/expected-undocumented-flags.txt
- docs/users_guide/extending_ghc.rst
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- docs/users_guide/exts/data_kinds.rst
- docs/users_guide/exts/derive_any_class.rst
- docs/users_guide/exts/deriving_extra.rst
- docs/users_guide/exts/deriving_inferred.rst
- docs/users_guide/exts/deriving_strategies.rst
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- docs/users_guide/exts/explicit_namespaces.rst
- docs/users_guide/exts/ffi.rst
- docs/users_guide/exts/gadt.rst
- docs/users_guide/exts/gadt_syntax.rst
- docs/users_guide/exts/generics.rst
- docs/users_guide/exts/linear_types.rst
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- docs/users_guide/exts/overloaded_strings.rst
- docs/users_guide/exts/pattern_synonyms.rst
- docs/users_guide/exts/poly_kinds.rst
- docs/users_guide/exts/pragmas.rst
- docs/users_guide/exts/primitives.rst
- + docs/users_guide/exts/qualified_strings.rst
- docs/users_guide/exts/rank_polymorphism.rst
- docs/users_guide/exts/rebindable_syntax.rst
- docs/users_guide/exts/recursive_do.rst
- + docs/users_guide/exts/relaxed_poly_rec.rst
- docs/users_guide/exts/required_type_arguments.rst
- docs/users_guide/exts/rewrite_rules.rst
- docs/users_guide/exts/roles.rst
- docs/users_guide/exts/scoped_type_variables.rst
- docs/users_guide/exts/standalone_deriving.rst
- docs/users_guide/exts/static_pointers.rst
- docs/users_guide/exts/stolen_syntax.rst
- docs/users_guide/exts/strict.rst
- docs/users_guide/exts/syntax.rst
- docs/users_guide/exts/table.rst
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- docs/users_guide/exts/type_data.rst
- docs/users_guide/exts/type_defaulting.rst
- docs/users_guide/exts/type_families.rst
- docs/users_guide/exts/types.rst
- docs/users_guide/flags.py
- docs/users_guide/ghc_config.py.in
- − docs/users_guide/ghc_packages.py
- docs/users_guide/ghci.rst
- docs/users_guide/gone_wrong.rst
- docs/users_guide/hints.rst
- docs/users_guide/index.rst
- docs/users_guide/javascript.rst
- docs/users_guide/packages.rst
- docs/users_guide/phases.rst
- docs/users_guide/profiling.rst
- docs/users_guide/release-notes.rst
- docs/users_guide/rtd-theme/layout.html
- docs/users_guide/runtime_control.rst
- docs/users_guide/separate_compilation.rst
- docs/users_guide/using-concurrent.rst
- docs/users_guide/using-optimisation.rst
- docs/users_guide/using-warnings.rst
- docs/users_guide/using.rst
- docs/users_guide/utils.py
- docs/users_guide/wasm.rst
- docs/users_guide/win32-dlls.rst
- − driver/Makefile
- − driver/ghc/Makefile
- − driver/ghci/Makefile
- driver/ghci/ghci.c
- − driver/haddock/Makefile
- driver/utils/cwrapper.c
- driver/utils/isMinTTY.c
- − driver/utils/merge_sections.ld
- − driver/utils/merge_sections_pe.ld
- ghc/GHC/Driver/Session/Lint.hs
- ghc/GHC/Driver/Session/Mode.hs
- ghc/GHCi/Leak.hs
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Exception.hs
- ghc/GHCi/UI/Info.hs
- ghc/GHCi/UI/Monad.hs
- ghc/GHCi/UI/Print.hs
- ghc/Main.hs
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- ghc/ghc-bin.cabal.in
- hadrian/README.md
- hadrian/bindist/Makefile
- hadrian/bindist/config.mk.in
- hadrian/bindist/cwrappers/cwrapper.c
- hadrian/bootstrap/generate_bootstrap_plans
- hadrian/bootstrap/hadrian-bootstrap-gen.cabal
- hadrian/bootstrap/plan-9_10_1.json
- hadrian/bootstrap/plan-9_6_5.json → hadrian/bootstrap/plan-9_10_2.json
- hadrian/bootstrap/plan-9_6_6.json → hadrian/bootstrap/plan-9_10_3.json
- hadrian/bootstrap/plan-9_6_4.json → hadrian/bootstrap/plan-9_12_1.json
- hadrian/bootstrap/plan-9_6_3.json → hadrian/bootstrap/plan-9_12_2.json
- + hadrian/bootstrap/plan-9_14_1.json
- − hadrian/bootstrap/plan-9_6_1.json
- − hadrian/bootstrap/plan-9_6_2.json
- − hadrian/bootstrap/plan-9_8_1.json
- − hadrian/bootstrap/plan-9_8_2.json
- hadrian/bootstrap/plan-bootstrap-9_10_1.json
- hadrian/bootstrap/plan-bootstrap-9_6_5.json → hadrian/bootstrap/plan-bootstrap-9_10_2.json
- hadrian/bootstrap/plan-bootstrap-9_6_6.json → hadrian/bootstrap/plan-bootstrap-9_10_3.json
- hadrian/bootstrap/plan-bootstrap-9_8_1.json → hadrian/bootstrap/plan-bootstrap-9_12_1.json
- hadrian/bootstrap/plan-bootstrap-9_6_4.json → hadrian/bootstrap/plan-bootstrap-9_12_2.json
- + hadrian/bootstrap/plan-bootstrap-9_14_1.json
- − hadrian/bootstrap/plan-bootstrap-9_6_1.json
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- hadrian/bootstrap/src/Main.hs
- hadrian/build-cabal
- hadrian/build-cabal.bat
- hadrian/cabal.project
- hadrian/cfg/default.host.target.in
- hadrian/cfg/default.target.in
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- hadrian/cfg/system.config.in
- + hadrian/cfg/system.config.target.in
- hadrian/doc/flavours.md
- hadrian/doc/make.md
- hadrian/doc/testsuite.md
- hadrian/doc/user-settings.md
- hadrian/hadrian.cabal
- hadrian/src/Base.hs
- + hadrian/src/BindistConfig.hs
- hadrian/src/Builder.hs
- hadrian/src/CommandLine.hs
- hadrian/src/Context.hs
- hadrian/src/Expression.hs
- hadrian/src/Flavour.hs
- hadrian/src/Flavour/Type.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Builder/Ar.hs
- hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
- hadrian/src/Hadrian/Haskell/Cabal/Type.hs
- hadrian/src/Hadrian/Haskell/Hash.hs
- hadrian/src/Hadrian/Oracles/ArgsHash.hs
- hadrian/src/Hadrian/Oracles/Cabal/Type.hs
- hadrian/src/Hadrian/Oracles/DirectoryContents.hs
- hadrian/src/Hadrian/Oracles/Path.hs
- hadrian/src/Hadrian/Oracles/TextFile.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Main.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Oracles/Flavour.hs
- hadrian/src/Oracles/ModuleFiles.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Oracles/TestSettings.hs
- hadrian/src/Packages.hs
- hadrian/src/Rules.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/CabalReinstall.hs
- + hadrian/src/Rules/Changelog.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Docspec.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Gmp.hs
- − hadrian/src/Rules/Libffi.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Lint.hs
- hadrian/src/Rules/Nofib.hs
- hadrian/src/Rules/Program.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Rules/SourceDist.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Rules/ToolArgs.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cabal.hs
- hadrian/src/Settings/Builders/Cc.hs
- hadrian/src/Settings/Builders/Common.hs
- hadrian/src/Settings/Builders/Configure.hs
- hadrian/src/Settings/Builders/DeriveConstants.hs
- hadrian/src/Settings/Builders/GenPrimopCode.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/Hsc2Hs.hs
- hadrian/src/Settings/Builders/Make.hs
- − hadrian/src/Settings/Builders/MergeObjects.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Builders/SplitSections.hs
- hadrian/src/Settings/Default.hs
- − hadrian/src/Settings/Flavours/Benchmark.hs
- hadrian/src/Settings/Flavours/Development.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Performance.hs
- hadrian/src/Settings/Flavours/Quick.hs
- hadrian/src/Settings/Flavours/QuickCross.hs
- hadrian/src/Settings/Flavours/Quickest.hs
- hadrian/src/Settings/Flavours/Validate.hs
- hadrian/src/Settings/Packages.hs
- hadrian/src/Settings/Program.hs
- hadrian/src/Settings/Warnings.hs
- hadrian/stack.yaml
- hadrian/stack.yaml.lock
- − libffi-tarballs
- libraries/Cabal
- − libraries/Makefile
- libraries/Win32
- libraries/array
- libraries/base/base.cabal.in
- libraries/base/changelog.md
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Arrow.hs
- libraries/base/src/Control/Concurrent.hs
- libraries/base/src/Control/Exception.hs
- libraries/base/src/Control/Exception/Backtrace.hs
- libraries/base/src/Control/Monad.hs
- libraries/base/src/Control/Monad/IO/Class.hs
- libraries/base/src/Data/Array/Byte.hs
- libraries/base/src/Data/Bifoldable1.hs
- libraries/base/src/Data/Bifunctor.hs
- libraries/base/src/Data/Bool.hs
- libraries/base/src/Data/Char.hs
- libraries/base/src/Data/Data.hs
- + libraries/base/src/Data/Double.hs
- libraries/base/src/Data/Eq.hs
- libraries/base/src/Data/Fixed.hs
- + libraries/base/src/Data/Float.hs
- libraries/base/src/Data/Functor/Classes.hs
- libraries/base/src/Data/Functor/Compose.hs
- libraries/base/src/Data/Ix.hs
- libraries/base/src/Data/List.hs
- libraries/base/src/Data/List/NonEmpty.hs
- + libraries/base/src/Data/List/NubOrdSet.hs
- libraries/base/src/Data/Semigroup.hs
- libraries/base/src/Data/Version.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/ByteOrder.hs
- libraries/base/src/GHC/Conc.hs
- libraries/base/src/GHC/Conc/Sync.hs
- − libraries/base/src/GHC/Desugar.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- libraries/base/src/GHC/Generics.hs
- libraries/base/src/GHC/IO/Handle.hs
- − libraries/base/src/GHC/IOPort.hs
- − libraries/base/src/GHC/JS/Prim/Internal/Build.hs
- libraries/base/src/GHC/Num.hs
- − libraries/base/src/GHC/Num/BigNat.hs
- − libraries/base/src/GHC/Num/Integer.hs
- − libraries/base/src/GHC/Num/Natural.hs
- libraries/base/src/GHC/RTS/Flags.hs
- libraries/base/src/GHC/ResponseFile.hs
- libraries/base/src/GHC/Stack.hs
- libraries/base/src/GHC/Stack/CloneStack.hs
- libraries/base/src/GHC/Stats.hs
- libraries/base/src/GHC/Unicode.hs
- libraries/base/src/GHC/Weak.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- libraries/base/src/Numeric.hs
- libraries/base/src/Prelude.hs
- libraries/base/src/System/CPUTime/Utils.hs
- libraries/base/src/System/Console/GetOpt.hs
- libraries/base/src/System/Environment.hs
- libraries/base/src/System/Exit.hs
- libraries/base/src/System/IO.hs
- + libraries/base/src/System/IO/OS.hs
- libraries/base/src/System/Info.hs
- libraries/base/src/System/Mem/Weak.hs
- libraries/base/src/System/Timeout.hs
- libraries/base/src/Text/Printf.hs
- libraries/base/src/Text/Read.hs
- libraries/base/tests/IO/T12010/cbits/initWinSock.c
- libraries/base/tests/IO/T17912.hs
- libraries/base/tests/IO/T18832.hs
- libraries/base/tests/IO/all.T
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- + libraries/base/tests/IO/osHandles001WindowsHandles.hs
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- libraries/base/tests/T15349.stderr
- libraries/base/tests/T23454.stderr
- libraries/base/tests/all.T
- libraries/base/tests/enum01.stdout
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- libraries/base/tests/perf/all.T
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- libraries/file-io
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- libraries/ghc-bignum/ghc-bignum.cabal
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- libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
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- libraries/ghc-boot/GHC/Data/ShortText.hs
- libraries/ghc-boot/GHC/Data/SizedSeq.hs
- compiler/GHC/Data/SmallArray.hs → libraries/ghc-boot/GHC/Data/SmallArray.hs
- libraries/ghc-boot/GHC/Settings/Utils.hs
- libraries/ghc-boot/GHC/Unit/Database.hs
- libraries/ghc-boot/Setup.hs
- libraries/ghc-boot/ghc-boot.cabal.in
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- libraries/ghc-compact/GHC/Compact/Serialized.hs
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- libraries/ghc-experimental/ghc-experimental.cabal.in
- libraries/ghc-experimental/src/Data/Sum/Experimental.hs
- libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
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- libraries/ghc-experimental/src/GHC/PrimOps.hs
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- + libraries/ghc-experimental/src/GHC/Stack/Decode/Experimental.hs
- libraries/ghc-experimental/src/GHC/TypeNats/Experimental.hs
- + libraries/ghc-experimental/src/System/Mem/Experimental.hs
- + libraries/ghc-experimental/tests/Makefile
- libraries/base/src/GHC/Weak/Finalizehs → libraries/ghc-experimental/tests/all.T
- libraries/base/tests/perf/Makefile → libraries/ghc-experimental/tests/backtraces/Makefile
- + libraries/ghc-experimental/tests/backtraces/T26806a.hs
- + libraries/ghc-experimental/tests/backtraces/T26806a.stderr
- + libraries/ghc-experimental/tests/backtraces/T26806b.hs
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- libraries/ghc-heap/GHC/Exts/Heap/ClosureTypes.hs
- libraries/ghc-heap/GHC/Exts/Heap/Closures.hs
- + libraries/ghc-heap/GHC/Exts/Heap/Constants.hs
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
- + libraries/ghc-heap/GHC/Exts/Heap/InfoTable.hs
- + libraries/ghc-heap/GHC/Exts/Heap/InfoTable/Types.hs
- + libraries/ghc-heap/GHC/Exts/Heap/InfoTableProf.hs
- libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/Types.hs
- libraries/ghc-heap/GHC/Exts/Heap/Utils.hsc
- libraries/ghc-heap/GHC/Exts/Stack.hs
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- libraries/ghc-heap/GHC/Exts/Stack/Decode.hs
- libraries/ghc-heap/ghc-heap.cabal.in
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- libraries/ghc-heap/tests/all.T
- libraries/ghc-heap/tests/parse_tso_flags.hs
- libraries/ghc-heap/tests/tso_and_stack_closures.hs
- libraries/ghc-internal/CHANGELOG.md
- libraries/ghc-internal/bignum-backend.rst
- libraries/ghc-heap/cbits/HeapPrim.cmm → libraries/ghc-internal/cbits/HeapPrim.cmm
- + libraries/ghc-internal/cbits/RtsIface.c
- libraries/ghc-heap/cbits/Stack.cmm → libraries/ghc-internal/cbits/Stack.cmm
- libraries/ghc-internal/cbits/StackCloningDecoding.cmm
- libraries/ghc-heap/cbits/Stack_c.c → libraries/ghc-internal/cbits/Stack_c.c
- − libraries/ghc-internal/cbits/atomic.c
- libraries/ghc-internal/cbits/consUtils.c
- − libraries/ghc-internal/cbits/mulIntMayOflo.c
- libraries/ghc-internal/codepages/MakeTable.hs
- libraries/ghc-internal/codepages/Makefile
- libraries/ghc-internal/configure.ac
- libraries/ghc-internal/ghc-internal.buildinfo.in
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/include/CTypes.h
- libraries/ghc-internal/include/HsIntegerGmp.h.in
- + libraries/ghc-internal/include/RtsIfaceSymbols.h
- libraries/ghc-internal/jsbits/base.js
- + libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
- libraries/ghc-internal/src/GHC/Internal/Arr.hs
- libraries/ghc-internal/src/GHC/Internal/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Check.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/FFI.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Selected.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs
- libraries/ghc-internal/src/GHC/Internal/Bits.hs
- libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs
- − libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs-boot
- libraries/ghc-internal/src/GHC/Internal/CString.hs
- libraries/ghc-internal/src/GHC/Internal/Char.hs
- libraries/ghc-internal/src/GHC/Internal/Classes.hs
- + libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs
- libraries/ghc-internal/src/GHC/Internal/Clock.hsc
- libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/POSIX.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Signal.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
- − libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Conc/Windows.hs
- libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
- libraries/ghc-internal/src/GHC/Internal/Control/Arrow.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Concurrent/MVar.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fail.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fix.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/IO/Class.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Bits.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Dynamic.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Either.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Eq.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Function.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Const.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Utils.hs
- libraries/ghc-internal/src/GHC/Internal/Data/IORef.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Ix.hs
- libraries/ghc-internal/src/GHC/Internal/Data/List.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Monoid.hs
- libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Ord.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Proxy.hs
- libraries/ghc-internal/src/GHC/Internal/Data/STRef.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Semigroup/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Data/String.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Traversable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Coercion.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Equality.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Typeable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Typeable/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Unique.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Version.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs
- libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Encoding/UTF8.hs
- libraries/ghc-internal/src/GHC/Internal/Enum.hs
- libraries/ghc-internal/src/GHC/Internal/Environment.hs
- libraries/ghc-internal/src/GHC/Internal/Err.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Array.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Control.hs
- libraries/ghc-internal/src/GHC/Internal/Event/EPoll.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/IntVar.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Internal/Types.hs
- libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Manager.hs
- libraries/ghc-internal/src/GHC/Internal/Event/PSQ.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Poll.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Event/TimeOut.hs
- libraries/ghc-internal/src/GHC/Internal/Event/TimerManager.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Unique.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/Clock.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/ConsoleEvent.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/FFI.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/ManagedThreadPool.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
- libraries/ghc-internal/src/GHC/Internal/ExecutionStack.hs
- libraries/ghc-internal/src/GHC/Internal/ExecutionStack/Internal.hsc
- libraries/ghc-internal/src/GHC/Internal/Exts.hs
- libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs
- libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Fingerprint/Type.hs
- libraries/ghc-internal/src/GHC/Internal/Float.hs
- libraries/ghc-internal/src/GHC/Internal/Float/ConversionUtils.hs
- libraries/ghc-internal/src/GHC/Internal/Float/RealFracMethods.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/ConstPtr.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/Error.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/String.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/String/Encoding.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/Types.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/ForeignPtr/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Alloc.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Array.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Error.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Pool.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Utils.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Ptr.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Storable.hs
- libraries/ghc-internal/src/GHC/Internal/ForeignPtr.hs
- libraries/ghc-internal/src/GHC/Internal/ForeignSrcLang.hs
- libraries/ghc-internal/src/GHC/Internal/Functor/ZipList.hs
- libraries/ghc-internal/src/GHC/Internal/GHCi.hs
- libraries/ghc-internal/src/GHC/Internal/GHCi/Helpers.hs
- libraries/ghc-internal/src/GHC/Internal/Generics.hs
- + libraries/ghc-internal/src/GHC/Internal/Heap/Closures.hs
- libraries/ghc-heap/GHC/Exts/Heap/Constants.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/Constants.hsc
- libraries/ghc-heap/GHC/Exts/Heap/InfoTable.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable.hsc
- libraries/ghc-heap/GHC/Exts/Heap/InfoTable/Types.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable/Types.hsc
- libraries/ghc-heap/GHC/Exts/Heap/InfoTableProf.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTableProf.hsc
- + libraries/ghc-internal/src/GHC/Internal/Heap/ProfInfo/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Buffer.hs
- libraries/ghc-internal/src/GHC/Internal/IO/BufferedIO.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Device.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/API.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/Table.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Failure.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Iconv.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Latin1.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF16.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF32.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF8.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs-boot
- libraries/ghc-internal/src/GHC/Internal/IO/FD.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/FD.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Internals.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Flock.hsc
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/LinuxOFD.hsc
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/NoOp.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs
- − libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs-boot
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Windows.hs
- libraries/ghc-internal/src/GHC/Internal/IO/IOMode.hs
- libraries/ghc-internal/src/GHC/Internal/IO/SubSystem.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Unsafe.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Windows/Encoding.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
- libraries/ghc-internal/src/GHC/Internal/IOArray.hs
- − libraries/ghc-internal/src/GHC/Internal/IOPort.hs
- libraries/ghc-internal/src/GHC/Internal/IORef.hs
- libraries/ghc-internal/src/GHC/Internal/InfoProv.hs
- libraries/ghc-internal/src/GHC/Internal/InfoProv/Types.hsc
- libraries/ghc-internal/src/GHC/Internal/Int.hs
- libraries/ghc-internal/src/GHC/Internal/IsList.hs
- libraries/ghc-internal/src/GHC/Internal/Ix.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Foreign/Callback.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Prim.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal/Build.hs
- libraries/ghc-internal/src/GHC/Internal/LanguageExtensions.hs
- libraries/ghc-internal/src/GHC/Internal/Lexeme.hs
- libraries/ghc-internal/src/GHC/Internal/List.hs
- libraries/ghc-internal/src/GHC/Internal/MVar.hs
- libraries/ghc-internal/src/GHC/Internal/Magic.hs
- libraries/ghc-internal/src/GHC/Internal/Natural.hs
- libraries/ghc-internal/src/GHC/Internal/Num.hs
- libraries/ghc-internal/src/GHC/Internal/Numeric.hs
- libraries/ghc-internal/src/GHC/Internal/OverloadedLabels.hs
- libraries/ghc-internal/src/GHC/Internal/Pack.hs
- + libraries/ghc-internal/src/GHC/Internal/Prim.hs
- libraries/ghc-internal/src/GHC/Internal/Prim/PtrEq.hs
- libraries/ghc-internal/src/GHC/Internal/Profiling.hs
- libraries/ghc-internal/src/GHC/Internal/Ptr.hs
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags/Test.hsc
- libraries/ghc-internal/src/GHC/Internal/Read.hs
- libraries/ghc-internal/src/GHC/Internal/Real.hs
- − libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs
- libraries/ghc-internal/src/GHC/Internal/ST.hs
- + libraries/ghc-internal/src/GHC/Internal/STM.hs
- libraries/ghc-internal/src/GHC/Internal/STRef.hs
- libraries/ghc-internal/src/GHC/Internal/Show.hs
- libraries/ghc-internal/src/GHC/Internal/Stable.hs
- libraries/ghc-internal/src/GHC/Internal/StableName.hs
- libraries/ghc-internal/src/GHC/Internal/Stack.hs
- libraries/ghc-internal/src/GHC/Internal/Stack.hs-boot
- + libraries/ghc-internal/src/GHC/Internal/Stack/Annotation.hs
- libraries/ghc-internal/src/GHC/Internal/Stack/CCS.hsc
- libraries/ghc-internal/src/GHC/Internal/Stack/CloneStack.hs
- libraries/ghc-heap/GHC/Exts/Stack/Constants.hsc → libraries/ghc-internal/src/GHC/Internal/Stack/Constants.hsc
- + libraries/ghc-internal/src/GHC/Internal/Stack/ConstantsProf.hsc
- + libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
- libraries/ghc-internal/src/GHC/Internal/StaticPtr.hs
- libraries/ghc-internal/src/GHC/Internal/StaticPtr/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Stats.hsc
- libraries/ghc-internal/src/GHC/Internal/Storable.hs
- libraries/ghc-internal/src/GHC/Internal/System/Environment.hs
- libraries/ghc-internal/src/GHC/Internal/System/Environment/Blank.hsc
- libraries/ghc-internal/src/GHC/Internal/System/Environment/ExecutablePath.hsc
- − libraries/ghc-internal/src/GHC/Internal/System/Exit.hs
- libraries/ghc-internal/src/GHC/Internal/System/IO.hs
- libraries/ghc-internal/src/GHC/Internal/System/IO/Error.hs
- libraries/ghc-internal/src/GHC/Internal/System/Mem.hs
- libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
- libraries/ghc-internal/src/GHC/Internal/System/Posix/Types.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs
- + libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
- − libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs
- libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadP.hs
- libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadPrec.hs
- − libraries/ghc-internal/src/GHC/Internal/Text/Read.hs
- libraries/ghc-internal/src/GHC/Internal/Text/Read/Lex.hs
- libraries/ghc-internal/src/GHC/Internal/TopHandler.hs
- libraries/ghc-internal/src/GHC/Internal/Tuple.hs
- libraries/ghc-internal/src/GHC/Internal/TypeError.hs
- libraries/ghc-internal/src/GHC/Internal/TypeLits.hs
- libraries/ghc-internal/src/GHC/Internal/TypeLits/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/TypeNats.hs
- libraries/ghc-internal/src/GHC/Internal/TypeNats/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Types.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Bits.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/DerivedCoreProperties.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/GeneralCategory.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleLowerCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleTitleCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleUpperCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Version.hs
- libraries/ghc-internal/src/GHC/Internal/Unsafe/Coerce.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Conc.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Conc/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Exports.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Flag.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Imports.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Types.hs
- libraries/ghc-internal/src/GHC/Internal/Weak.hs
- libraries/ghc-internal/src/GHC/Internal/Weak/Finalize.hs
- libraries/ghc-internal/src/GHC/Internal/Windows.hs
- libraries/ghc-internal/src/GHC/Internal/Word.hs
- + libraries/ghc-internal/tests/Makefile
- testsuite/tests/driver/OneShotTH.stdout-javascript-unknown-ghcjs → libraries/ghc-internal/tests/all.T
- + libraries/ghc-internal/tests/backtraces/Makefile
- + libraries/ghc-internal/tests/backtraces/T14532a.hs
- + libraries/ghc-internal/tests/backtraces/T14532a.stdout
- + libraries/ghc-internal/tests/backtraces/T14532b.hs
- + libraries/ghc-internal/tests/backtraces/T14532b.stdout
- + libraries/ghc-internal/tests/backtraces/T15395.hs
- + libraries/ghc-internal/tests/backtraces/T15395.stdout
- + libraries/ghc-internal/tests/backtraces/T26507.hs
- + libraries/ghc-internal/tests/backtraces/T26507.stderr
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- + libraries/ghc-internal/tests/stack-annotation/ann_frame001.stdout
- + libraries/ghc-internal/tests/stack-annotation/ann_frame002.hs
- + libraries/ghc-internal/tests/stack-annotation/ann_frame002.stdout
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- + libraries/ghc-internal/tests/stack-annotation/ann_frame004.stdout
- + libraries/ghc-internal/tests/stack-annotation/ann_frame005.hs
- + libraries/ghc-internal/tests/stack-annotation/ann_frame005.stdout
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- libraries/ghc-internal/tools/ucd2haskell/ucd.sh
- libraries/ghc-internal/tools/ucd2haskell/ucd2haskell.cabal
- libraries/ghc-internal/tools/ucd2haskell/unicode_version
- libraries/ghc-platform/src/GHC/Platform/ArchOS.hs
- libraries/ghc-prim/changelog.md
- libraries/ghc-prim/ghc-prim.cabal
- − libraries/ghci/GHCi/BinaryArray.hs
- + libraries/ghci/GHCi/Coverage.hs
- libraries/ghci/GHCi/CreateBCO.hs
- + libraries/ghci/GHCi/Debugger.hs
- libraries/ghci/GHCi/Message.hs
- libraries/ghci/GHCi/ObjLink.hs
- libraries/ghci/GHCi/ResolvedBCO.hs
- libraries/ghci/GHCi/Run.hs
- libraries/ghci/GHCi/Server.hs
- libraries/ghci/GHCi/TH.hs
- libraries/ghci/ghci.cabal.in
- libraries/haskeline
- libraries/hpc
- + libraries/libffi-clib
- libraries/mtl
- libraries/os-string
- libraries/parsec
- libraries/process
- libraries/semaphore-compat
- libraries/stm
- + libraries/template-haskell-lift
- + libraries/template-haskell-quasiquoter
- libraries/template-haskell/Language/Haskell/TH/Lib.hs
- libraries/template-haskell/Language/Haskell/TH/Quote.hs
- libraries/template-haskell/Language/Haskell/TH/Syntax.hs
- libraries/template-haskell/changelog.md
- libraries/template-haskell/template-haskell.cabal.in
- libraries/template-haskell/tests/all.T
- libraries/template-haskell/vendored-filepath/System/FilePath/Posix.hs
- libraries/template-haskell/vendored-filepath/System/FilePath/Windows.hs
- libraries/terminfo
- libraries/text
- libraries/time
- libraries/transformers
- libraries/unix
- libraries/xhtml
- linters/lint-codes/LintCodes/Coverage.hs
- linters/lint-codes/LintCodes/Static.hs
- − linters/lint-codes/Makefile
- − linters/lint-notes/Makefile
- linters/lint-whitespace/lint-whitespace.cabal
- llvm-passes
- llvm-targets
- − m4/find_ghc_bootstrap_prog.m4
- m4/find_ld.m4
- m4/find_llvm_prog.m4
- m4/find_python.m4
- m4/fp_check_pthreads.m4
- − m4/fp_check_timer_create.m4
- m4/fp_cmm_cpp_cmd_with_args.m4
- − m4/fp_copy_shellvar.m4
- m4/fp_find_libdw.m4
- m4/fp_find_nm.m4
- + m4/fp_linker_supports_verbatim.m4
- m4/fp_prog_cc_linker_target.m4
- − m4/fp_prog_ld_flag.m4
- − m4/fp_prog_sort.m4
- − m4/fp_set_cflags_c99.m4
- − m4/fp_settings.m4
- m4/fp_setup_project_version.m4
- m4/fp_setup_windows_toolchain.m4
- − m4/fp_visibility_hidden.m4
- m4/fptools_alex.m4
- m4/fptools_ghc_version.m4
- m4/fptools_happy.m4
- m4/fptools_set_c_ld_flags.m4
- m4/fptools_set_platform_vars.m4
- m4/ghc_select_file_extensions.m4
- m4/ghc_toolchain.m4
- m4/prep_target_file.m4
- + m4/subst_tooldir.m4
- mk/get-win32-tarballs.py
- mk/hsc2hs.in
- mk/system-cxx-std-lib-1.0.conf.in
- − mk/win32-tarballs.md5sum
- nofib
- packages
- rts/.gitignore
- + rts/.ubsan-suppressions
- + rts/AllocArray.c
- + rts/AllocArray.h
- rts/Apply.cmm
- rts/BeginPrivate.h
- + rts/BuiltinClosures.c
- + rts/BuiltinClosures.h
- rts/Capability.c
- rts/Capability.h
- rts/CloneStack.c
- rts/CloneStack.h
- rts/ClosureFlags.c
- + rts/ClosureTable.c
- + rts/ClosureTable.h
- rts/Compact.cmm
- rts/Continuation.c
- rts/ContinuationOps.cmm
- rts/Disassembler.c
- rts/EndPrivate.h
- rts/Exception.cmm
- rts/ExecPage.c
- rts/Hash.c
- rts/Heap.c
- rts/HeapStackCheck.cmm
- rts/Hpc.c
- rts/IOManager.c
- rts/IOManager.h
- rts/IOManagerInternals.h
- rts/IPE.c
- rts/Interpreter.c
- rts/Interpreter.h
- rts/Jumps.h
- rts/LdvProfile.c
- rts/Linker.c
- rts/LinkerInternals.h
- − rts/Makefile
- rts/ZeroSlop.c → rts/MarkSlop.c
- rts/Messages.c
- rts/Prelude.h
- rts/PrimOps.cmm
- rts/Printer.c
- rts/ProfHeap.c
- rts/Profiling.c
- rts/RaiseAsync.c
- rts/RaiseAsync.h
- rts/RetainerProfile.c
- rts/RetainerSet.c
- rts/RtsAPI.c
- − rts/RtsDllMain.c
- − rts/RtsDllMain.h
- rts/RtsFlags.c
- rts/RtsMessages.c
- rts/RtsSignals.h
- rts/RtsStartup.c
- rts/RtsSymbols.c
- rts/RtsSymbols.h
- + rts/RtsToHsIface.c
- rts/RtsUtils.c
- rts/STM.c
- rts/STM.h
- rts/Schedule.c
- rts/Schedule.h
- rts/Stats.c
- rts/StgCRun.c
- rts/StgMiscClosures.cmm
- rts/StgStartup.cmm
- rts/StgStdThunks.cmm
- rts/Task.c
- rts/Task.h
- rts/ThreadLabels.c
- rts/ThreadPaused.c
- rts/Threads.c
- rts/Threads.h
- rts/Ticker.h
- + rts/TimeoutQueue.c
- + rts/TimeoutQueue.h
- rts/Timer.c
- rts/Timer.h
- rts/Trace.c
- rts/Trace.h
- rts/TraverseHeap.c
- rts/Updates.h
- rts/Weak.c
- rts/configure.ac
- rts/eventlog/EventLog.c
- rts/eventlog/EventLog.h
- − rts/external-symbols.list.in
- rts/gen_event_types.py
- rts/include/Cmm.h
- − rts/include/Makefile
- rts/include/Rts.h
- rts/include/RtsAPI.h
- rts/include/Stg.h
- rts/include/rts/Bytecodes.h
- rts/include/rts/Constants.h
- rts/include/rts/EventLogFormat.h
- rts/include/rts/EventLogWriter.h
- rts/include/rts/Flags.h
- rts/include/rts/IOInterface.h
- rts/include/rts/IPE.h
- rts/include/rts/Messages.h
- rts/include/rts/NonMoving.h
- rts/include/rts/OSThreads.h
- rts/include/rts/PosixSource.h
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- rts/include/rts/StableName.h
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Hannes Siebenhandl (＠fendor)

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