Simon Jakobi pushed to branch wip/sjakobi/tweak-mk_mod_usage_info at Glasgow Haskell Compiler / GHC

Commits:

• 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/a51c4ee1556d816ad86e90db7e6330dd51b0b6e7/release-notes/cabal-install-3.12.1.0.md?plain=1#L45
  
  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=ccead81bbc39668376eb5cf47066acb446cc43f3
  
  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.
  

1054 changed files:

• .gitlab-ci.yml
• .gitlab/ci.sh
• .gitlab/generate-ci/gen_ci.hs
• .gitlab/jobs.yaml
• .gitlab/merge_request_templates/Default.md
• .gitmodules
• boot
• + changelog.d/26616
• + changelog.d/T17833
• + changelog.d/T19174.md
• + changelog.d/T21176
• + changelog.d/T26978
• + changelog.d/T26979
• + changelog.d/T27022
• + changelog.d/T27046
• + changelog.d/T27047
• + changelog.d/T27131
• + changelog.d/T27182.md
• + changelog.d/T27202
• + changelog.d/T27225
• + changelog.d/T27261
• + changelog.d/T27308
• + changelog.d/T27317
• + changelog.d/T27359
• + changelog.d/T27386
• + 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/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-blackhole-handling
• + changelog.d/fix-exponential-case-desugar-27383
• + changelog.d/fix-finalizers-27072
• + changelog.d/fix-plugin-finder-multi-home-unit.md
• + 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/hadrian-response-files.md
• + changelog.d/hadrian-stale-package-confs-26661
• + changelog.d/hadrian-system-cxx-std-lib-25303
• + changelog.d/interactive-error-hints
• + changelog.d/ipe-event-class
• + changelog.d/jobserver-leak-fix
• + 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/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/unused-type
• + changelog.d/wasm-fix-serviceworker
• + changelog.d/windows-rethrow-overlapped-exception
• + changelog.d/withTcPlugins.md
• compiler/.hlint.yaml
• compiler/GHC.hs
• compiler/GHC/Builtin/Names.hs
• compiler/GHC/Builtin/Types.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
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• compiler/GHC/CmmToAsm/Reg/Linear/FreeRegs.hs
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• compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
• compiler/GHC/CmmToAsm/Reg/Linear/X86_64.hs
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• compiler/GHC/Core/Lint.hs
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• compiler/GHC/Core/Opt/ConstantFold.hs
• compiler/GHC/Core/Opt/FloatIn.hs
• compiler/GHC/Core/Opt/FloatOut.hs
• compiler/GHC/Core/Opt/Monad.hs
• compiler/GHC/Core/Opt/OccurAnal.hs
• compiler/GHC/Core/Opt/Simplify.hs
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• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
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• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/BooleanFormula.hs
• compiler/GHC/Data/FastString.hs
• compiler/GHC/Data/List/NonEmpty.hs
• compiler/GHC/Data/List/SetOps.hs
• compiler/GHC/Data/Pair.hs
• compiler/GHC/Driver/Backend.hs
• compiler/GHC/Driver/Backpack.hs
• compiler/GHC/Driver/CodeOutput.hs
• compiler/GHC/Driver/Config.hs
• compiler/GHC/Driver/Config/Core/Lint.hs
• compiler/GHC/Driver/Config/Interpreter.hs
• compiler/GHC/Driver/Downsweep.hs
• compiler/GHC/Driver/DynFlags.hs
• compiler/GHC/Driver/Env/Types.hs
• compiler/GHC/Driver/Errors.hs
• compiler/GHC/Driver/Errors/Ppr.hs
• compiler/GHC/Driver/Errors/Types.hs
• compiler/GHC/Driver/Flags.hs
• compiler/GHC/Driver/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/MakeSem.hs
• compiler/GHC/Driver/Pipeline.hs
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Pipeline/Monad.hs
• compiler/GHC/Driver/Pipeline/Phases.hs
• compiler/GHC/Driver/Session.hs
• compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs.hs
• compiler/GHC/Hs/Basic.hs
• compiler/GHC/Hs/Binds.hs
• compiler/GHC/Hs/Decls.hs
• compiler/GHC/Hs/DocString.hs
• compiler/GHC/Hs/Dump.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/Expr.hs-boot
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Instances.hs
• compiler/GHC/Hs/Pat.hs
• compiler/GHC/Hs/Stats.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/Hs/Utils.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Arrows.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/JavaScript.hs
• compiler/GHC/HsToCore/Match.hs
• compiler/GHC/HsToCore/Match.hs-boot
• compiler/GHC/HsToCore/Match/Constructor.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Pmc/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Types.hs
• compiler/GHC/HsToCore/Usage.hs
• compiler/GHC/Iface/Binary.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/Load.hs
• compiler/GHC/Iface/Recomp.hs
• compiler/GHC/Iface/Tidy.hs
• compiler/GHC/Iface/Type.hs
• compiler/GHC/IfaceToCore.hs
• compiler/GHC/Linker/Executable.hs
• compiler/GHC/Linker/Loader.hs
• compiler/GHC/Linker/Unit.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/Errors/Ppr.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/Lexer.x
• compiler/GHC/Parser/PostProcess.hs
• compiler/GHC/Parser/PostProcess/Haddock.hs
• compiler/GHC/Parser/Types.hs
• compiler/GHC/Rename/Bind.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Expr.hs
• compiler/GHC/Rename/HsType.hs
• compiler/GHC/Rename/Module.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Pat.hs
• compiler/GHC/Rename/Splice.hs
• compiler/GHC/Rename/Splice.hs-boot
• compiler/GHC/Rename/Unbound.hs
• compiler/GHC/Rename/Utils.hs
• compiler/GHC/Runtime/Debugger/Breakpoints.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Eval/Types.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Loader.hs
• compiler/GHC/Settings.hs
• compiler/GHC/Settings/Constants.hs
• compiler/GHC/Settings/IO.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/Pipeline.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToJS/Ids.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/Generate.hs
• compiler/GHC/Tc/Errors.hs
• compiler/GHC/Tc/Errors/Hole.hs
• compiler/GHC/Tc/Errors/Ppr.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Gen/App.hs
• compiler/GHC/Tc/Gen/Bind.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Gen/Head.hs
• compiler/GHC/Tc/Gen/HsType.hs
• compiler/GHC/Tc/Gen/Pat.hs
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• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Solver/Default.hs
• compiler/GHC/Tc/Solver/Equality.hs
• compiler/GHC/Tc/Solver/FunDeps.hs
• compiler/GHC/Tc/Solver/Rewrite.hs
• compiler/GHC/Tc/Solver/Solve.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/TyCl/Utils.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/Evidence.hs
• compiler/GHC/Tc/Utils/Backpack.hs
• compiler/GHC/Tc/Utils/Env.hs
• compiler/GHC/Tc/Utils/Monad.hs
• compiler/GHC/Tc/Utils/TcMType.hs
• compiler/GHC/Tc/Utils/TcType.hs
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Error.hs
• − compiler/GHC/Types/Error.hs-boot
• compiler/GHC/Types/Error/Codes.hs
• compiler/GHC/Types/ForeignStubs.hs
• compiler/GHC/Types/Hint.hs
• compiler/GHC/Types/Hint/Ppr.hs
• compiler/GHC/Types/HpcInfo.hs
• compiler/GHC/Types/Id/Make.hs
• compiler/GHC/Types/Name/Cache.hs
• compiler/GHC/Types/Name/Reader.hs
• compiler/GHC/Types/RepType.hs
• compiler/GHC/Types/SourceError.hs
• compiler/GHC/Types/Unique.hs
• compiler/GHC/Types/Unique/DSet.hs
• compiler/GHC/Types/Unique/Supply.hs
• compiler/GHC/Unit.hs
• compiler/GHC/Unit/Finder.hs
• compiler/GHC/Unit/Finder/Types.hs
• compiler/GHC/Unit/Info.hs
• compiler/GHC/Unit/Module/Deps.hs
• compiler/GHC/Unit/Module/Env.hs
• compiler/GHC/Unit/Module/Graph.hs
• compiler/GHC/Unit/Module/ModGuts.hs
• compiler/GHC/Unit/State.hs
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Utils/Binary.hs
• compiler/GHC/Utils/Error.hs
• compiler/GHC/Utils/Logger.hs
• compiler/GHC/Utils/Misc.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/GHC/Utils/Ppr/Colour.hs
• compiler/Language/Haskell/Syntax.hs
• compiler/Language/Haskell/Syntax/Binds.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• compiler/Language/Haskell/Syntax/Decls/Foreign.hs
• compiler/Language/Haskell/Syntax/Extension.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• compiler/Language/Haskell/Syntax/Pat.hs
• compiler/Language/Haskell/Syntax/Type.hs
• compiler/ghc.cabal.in
• configure.ac
• distrib/configure.ac.in
• docs/users_guide/bugs.rst
• docs/users_guide/debug-info.rst
• docs/users_guide/debugging.rst
• docs/users_guide/extending_ghc.rst
• docs/users_guide/exts/explicit_namespaces.rst
• docs/users_guide/exts/linear_types.rst
• docs/users_guide/exts/modifiers.rst
• docs/users_guide/exts/qualified_strings.rst
• docs/users_guide/exts/required_type_arguments.rst
• docs/users_guide/exts/stolen_syntax.rst
• docs/users_guide/exts/template_haskell.rst
• docs/users_guide/ghci.rst
• docs/users_guide/javascript.rst
• docs/users_guide/phases.rst
• docs/users_guide/profiling.rst
• docs/users_guide/runtime_control.rst
• docs/users_guide/using-warnings.rst
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• ghc/GHC/Driver/Session/Mode.hs
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Exception.hs
• ghc/GHCi/UI/Info.hs
• ghc/Main.hs
• ghc/ghc-bin.cabal.in
• hadrian/README.md
• hadrian/bindist/config.mk.in
• hadrian/build-cabal
• hadrian/build-cabal.bat
• hadrian/cfg/default.host.target.in
• hadrian/cfg/default.target.in
• + hadrian/cfg/system.config.host.in
• hadrian/cfg/system.config.in
• + hadrian/cfg/system.config.target.in
• hadrian/doc/flavours.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/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/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/Documentation.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Gmp.hs
• hadrian/src/Rules/Library.hs
• hadrian/src/Rules/Program.hs
• hadrian/src/Rules/Register.hs
• hadrian/src/Rules/Rts.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Cabal.hs
• hadrian/src/Settings/Builders/Common.hs
• hadrian/src/Settings/Builders/Configure.hs
• hadrian/src/Settings/Builders/DeriveConstants.hs
• hadrian/src/Settings/Builders/Ghc.hs
• hadrian/src/Settings/Builders/Hsc2Hs.hs
• hadrian/src/Settings/Builders/RunTest.hs
• hadrian/src/Settings/Builders/SplitSections.hs
• hadrian/src/Settings/Default.hs
• hadrian/src/Settings/Flavours/GhcInGhci.hs
• hadrian/src/Settings/Flavours/Performance.hs
• hadrian/src/Settings/Flavours/QuickCross.hs
• hadrian/src/Settings/Packages.hs
• hadrian/src/Settings/Program.hs
• hadrian/src/Settings/Warnings.hs
• libraries/base/base.cabal.in
• libraries/base/changelog.md
• libraries/base/src/Control/Applicative.hs
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• libraries/base/src/Control/Exception.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/Data.hs
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• libraries/base/src/Data/Fixed.hs
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• libraries/base/src/Data/Functor/Compose.hs
• libraries/base/src/Data/List/NonEmpty.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/Exts.hs
• libraries/base/src/GHC/Fingerprint.hs
• libraries/base/src/GHC/IO/Handle.hs
• libraries/base/src/GHC/RTS/Flags.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/IO.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/all.T
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• libraries/ghc-bignum/changelog.md
• libraries/ghc-bignum/ghc-bignum.cabal
• + libraries/ghc-boot/GHC/Data/ShortByteString.hs
• libraries/ghc-boot/GHC/Settings/Utils.hs
• libraries/ghc-boot/ghc-boot.cabal.in
• libraries/ghc-experimental/src/Data/Sum/Experimental.hs
• libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
• libraries/ghc-experimental/src/GHC/PrimOps.hs
• libraries/ghc-internal/bignum-backend.rst
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/include/CTypes.h
• 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
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• libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
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• libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs
• libraries/ghc-internal/src/GHC/Internal/Bits.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
• libraries/ghc-internal/src/GHC/Internal/Exts.hs
• libraries/ghc-internal/src/GHC/Internal/Float.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Device.hs
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• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs
• libraries/ghc-internal/src/GHC/Internal/IO/IOMode.hs
• libraries/ghc-internal/src/GHC/Internal/Lexeme.hs
• libraries/ghc-internal/src/GHC/Internal/List.hs
• libraries/ghc-internal/src/GHC/Internal/Natural.hs
• libraries/ghc-internal/src/GHC/Internal/Numeric.hs
• libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
• libraries/ghc-internal/src/GHC/Internal/Read.hs
• libraries/ghc-internal/src/GHC/Internal/System/IO.hs
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• libraries/ghc-internal/src/GHC/Internal/Types.hs
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• libraries/ghci/GHCi/Message.hs
• libraries/ghci/GHCi/Run.hs
• libraries/ghci/GHCi/TH.hs
• libraries/ghci/ghci.cabal.in
• libraries/process
• libraries/semaphore-compat
• libraries/xhtml
• m4/find_llvm_prog.m4
• m4/fp_find_nm.m4
• m4/fp_setup_windows_toolchain.m4
• m4/ghc_toolchain.m4
• m4/prep_target_file.m4
• rts/.gitignore
• rts/Capability.c
• rts/Disassembler.c
• rts/Hpc.c
• rts/IOManager.h
• rts/IPE.c
• rts/Interpreter.c
• rts/Linker.c
• rts/LinkerInternals.h
• rts/Messages.c
• rts/RtsFlags.c
• rts/RtsSymbols.c
• rts/RtsSymbols.h
• rts/Schedule.c
• rts/StgMiscClosures.cmm
• rts/ThreadPaused.c
• rts/Threads.c
• rts/Threads.h
• rts/Timer.c
• rts/Trace.c
• rts/Trace.h
• rts/Updates.h
• rts/eventlog/EventLog.c
• rts/eventlog/EventLog.h
• rts/include/rts/Bytecodes.h
• rts/include/rts/EventLogWriter.h
• rts/include/rts/Flags.h
• rts/include/rts/OSThreads.h
• rts/include/rts/storage/ClosureMacros.h
• rts/include/rts/storage/Closures.h
• rts/include/stg/MiscClosures.h
• rts/linker/Elf.c
• + rts/posix/FdWakeup.c
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• rts/sm/BlockAlloc.c
• rts/sm/Evac.h
• rts/sm/MBlock.c
• rts/sm/NonMoving.c
• + rts/win32/libHSghc-internal.def.in
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• testsuite/driver/runtests.py
• testsuite/driver/testlib.py
• testsuite/ghc-config/ghc-config.hs
• testsuite/mk/test.mk
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• testsuite/tests/ghc-api/downsweep/OldModLocation.hs
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• testsuite/tests/parser/should_fail/all.T
• testsuite/tests/parser/should_run/ListTuplePunsConstraints.hs
• testsuite/tests/perf/compiler/Makefile
• testsuite/tests/perf/compiler/T11068.stdout
• + testsuite/tests/perf/compiler/T26426.hs
• + testsuite/tests/perf/compiler/T26989.hs
• + testsuite/tests/perf/compiler/T26989a.hs
• testsuite/tests/perf/compiler/all.T
• testsuite/tests/perf/compiler/genMultiComp.py
• + testsuite/tests/perf/should_run/T11226.hs
• + testsuite/tests/perf/should_run/T11226.stdout
• testsuite/tests/perf/should_run/all.T
• testsuite/tests/plugins/defaulting-plugin/DefaultInterference.hs
• testsuite/tests/plugins/defaulting-plugin/DefaultInvalid.hs
• testsuite/tests/plugins/defaulting-plugin/DefaultLifted.hs
• testsuite/tests/plugins/defaulting-plugin/DefaultMultiParam.hs
• testsuite/tests/plugins/echo-plugin/Echo.hs
• testsuite/tests/plugins/plugins09.stdout
• testsuite/tests/plugins/plugins10.stdout
• testsuite/tests/plugins/plugins11.stdout
• testsuite/tests/plugins/static-plugins.stdout
• testsuite/tests/pmcheck/should_compile/T12957.stderr
• testsuite/tests/printer/AnnotationNoListTuplePuns.stdout
• testsuite/tests/printer/Makefile
• + testsuite/tests/printer/PprInfixHole.hs
• testsuite/tests/printer/PprModifiers.hs
• + testsuite/tests/printer/PprQualifiedStrings.hs
• testsuite/tests/printer/T18052a.stderr
• testsuite/tests/printer/T18791.stderr
• testsuite/tests/printer/Test10309.hs
• testsuite/tests/printer/Test20297.stdout
• testsuite/tests/printer/Test24533.stdout
• + testsuite/tests/printer/Test27291.hs
• testsuite/tests/printer/all.T
• + testsuite/tests/profiling/should_compile/T27182.hs
• + testsuite/tests/profiling/should_compile/T27386.hs
• testsuite/tests/profiling/should_compile/all.T
• + testsuite/tests/profiling/should_run/T27225.hs
• + testsuite/tests/profiling/should_run/T27225.stdout
• + testsuite/tests/profiling/should_run/T27225b.hs
• + testsuite/tests/profiling/should_run/T27225b.stdout
• testsuite/tests/profiling/should_run/all.T
• testsuite/tests/profiling/should_run/caller-cc/CallerCc1.prof.sample
• testsuite/tests/profiling/should_run/callstack001.stdout
• testsuite/tests/profiling/should_run/scc001.prof.sample
• testsuite/tests/profiling/should_run/staticcallstack002.stdout
• testsuite/tests/quasiquotation/T7918.hs
• testsuite/tests/quasiquotation/qq001/qq001.stderr
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• testsuite/tests/quasiquotation/qq003/qq003.stderr
• testsuite/tests/quasiquotation/qq004/qq004.stderr
• testsuite/tests/quotes/LiftErrMsg.stderr
• testsuite/tests/quotes/LiftErrMsgDefer.stderr
• testsuite/tests/quotes/LiftErrMsgTyped.stderr
• testsuite/tests/quotes/T10384.stderr
• testsuite/tests/quotes/T5721.stderr
• testsuite/tests/quotes/TH_localname.stderr
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• + testsuite/tests/rts/T25275/DebugIpe.hs
• + testsuite/tests/rts/T25275/T25275_A.stdout
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• + testsuite/tests/rts/T27131.stdout
• + testsuite/tests/rts/T27131_c.c
• testsuite/tests/rts/all.T
• + testsuite/tests/rts/linker/T27072/Lib.c
• + testsuite/tests/rts/linker/T27072/Makefile
• + testsuite/tests/rts/linker/T27072/T27072.stdout
• + testsuite/tests/rts/linker/T27072/all.T
• + testsuite/tests/rts/linker/T27072/main.c
• testsuite/tests/showIface/DocsInHiFile1.stdout
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• testsuite/tests/showIface/NoExportList.stdout
• + testsuite/tests/simd/should_run/Makefile
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• testsuite/tests/simplCore/should_compile/DsSpecPragmas.stderr
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• + testsuite/tests/simplCore/should_compile/T27296.stdout
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• testsuite/tests/simplCore/should_compile/T4201.stdout
• testsuite/tests/simplCore/should_compile/T8331.stderr
• testsuite/tests/simplCore/should_compile/T8832.hs
• testsuite/tests/simplCore/should_compile/T8832.stdout
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• testsuite/tests/simplCore/should_compile/all.T
• testsuite/tests/simplCore/should_compile/spec004.stderr
• + testsuite/tests/simplCore/should_run/T27005.hs
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• testsuite/tests/simplCore/should_run/all.T
• testsuite/tests/simplStg/should_compile/T24806.hs
• testsuite/tests/simplStg/should_compile/T24806.stderr
• + testsuite/tests/simplStg/should_compile/T27005b.hs
• + testsuite/tests/simplStg/should_compile/T27005b.stderr
• testsuite/tests/simplStg/should_compile/all.T
• testsuite/tests/simplStg/should_compile/inferTags004.hs
• testsuite/tests/simplStg/should_compile/inferTags004.stderr
• + testsuite/tests/simplStg/should_run/T27005a.hs
• + testsuite/tests/simplStg/should_run/T27005a.stdout
• testsuite/tests/simplStg/should_run/all.T
• testsuite/tests/splice-imports/SI03.stderr
• testsuite/tests/splice-imports/SI05.stderr
• testsuite/tests/splice-imports/SI08.stderr
• testsuite/tests/splice-imports/SI08_oneshot.stderr
• testsuite/tests/splice-imports/SI16.stderr
• testsuite/tests/splice-imports/SI18.stderr
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• testsuite/tests/splice-imports/T26088.stderr
• testsuite/tests/splice-imports/T26090.stderr
• + testsuite/tests/splice-imports/T26616.hs
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• testsuite/tests/splice-imports/all.T
• testsuite/tests/tcplugins/Common.hs
• testsuite/tests/tcplugins/RewritePerfPlugin.hs
• testsuite/tests/tcplugins/T11462_Plugin.hs
• testsuite/tests/tcplugins/T11525_Plugin.hs
• testsuite/tests/tcplugins/T26395_Plugin.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.script
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.stderr
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.stdout
• + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.hs-boot
• + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.stderr
• + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode_aux.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Warn.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Warn.stderr
• testsuite/tests/tcplugins/all.T
• + testsuite/tests/tcplugins/tc-plugin-initstop/Makefile
• + testsuite/tests/tcplugins/tc-plugin-initstop/Setup.hs
• + testsuite/tests/tcplugins/tc-plugin-initstop/TcPlugin_InitStop_Plugin.hs
• + testsuite/tests/tcplugins/tc-plugin-initstop/tc-plugin-initstop.cabal
• testsuite/tests/th/T16976z.stderr
• testsuite/tests/th/T17820a.stderr
• testsuite/tests/th/T17820b.stderr
• testsuite/tests/th/T17820c.stderr
• testsuite/tests/th/T17820d.stderr
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• testsuite/tests/th/T21547.stderr
• testsuite/tests/th/T23829_hasty.stderr
• testsuite/tests/th/T23829_hasty_b.stderr
• testsuite/tests/th/T23829_tardy.ghc.stderr
• testsuite/tests/th/T24111.stdout
• testsuite/tests/th/T26098_local.stderr
• testsuite/tests/th/T26098_quote.stderr
• testsuite/tests/th/T26098_splice.stderr
• testsuite/tests/th/T26099.stderr
• testsuite/tests/th/T26568.stderr
• + testsuite/tests/th/T27022.hs
• + testsuite/tests/th/T27022.stdout
• testsuite/tests/th/T5795.stderr
• testsuite/tests/th/all.T
• testsuite/tests/typecheck/should_compile/T13032.stderr
• + testsuite/tests/typecheck/should_compile/T23135.hs
• testsuite/tests/typecheck/should_compile/T9497a.stderr
• testsuite/tests/typecheck/should_compile/all.T
• testsuite/tests/typecheck/should_compile/holes.stderr
• testsuite/tests/typecheck/should_compile/holes3.stderr
• testsuite/tests/typecheck/should_compile/subsumption_sort_hole_fits.stderr
• testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr
• testsuite/tests/typecheck/should_fail/T13292.stderr
• testsuite/tests/typecheck/should_fail/T21130.stderr
• + testsuite/tests/typecheck/should_fail/T27210.hs
• + testsuite/tests/typecheck/should_fail/T27210.stderr
• + testsuite/tests/typecheck/should_fail/T27390-explicit-kinds.stderr
• + testsuite/tests/typecheck/should_fail/T27390.hs
• + testsuite/tests/typecheck/should_fail/T27390.stderr
• + testsuite/tests/typecheck/should_fail/T27390a.hs
• testsuite/tests/typecheck/should_fail/T9497d.stderr
• testsuite/tests/typecheck/should_fail/all.T
• testsuite/tests/typecheck/should_run/T9497a-run.stderr
• testsuite/tests/typecheck/should_run/T9497b-run.stderr
• testsuite/tests/typecheck/should_run/T9497c-run.stderr
• testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs
• utils/check-exact/ExactPrint.hs
• utils/check-exact/Main.hs
• utils/check-exact/Preprocess.hs
• utils/check-exact/Transform.hs
• utils/check-exact/Utils.hs
• utils/ghc-pkg/Main.hs
• utils/ghc-toolchain/exe/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Program.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Utils.hs
• utils/haddock/CONTRIBUTING.md
• utils/haddock/haddock-api/haddock-api.cabal
• utils/haddock/haddock-api/src/Haddock.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/DocMarkup.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Meta.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Names.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Utils.hs
• utils/haddock/haddock-api/src/Haddock/Convert.hs
• utils/haddock/haddock-api/src/Haddock/Doc.hs
• utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
• utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Json.hs
• utils/haddock/haddock-api/src/Haddock/Interface/LexParseRn.hs
• utils/haddock/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
• utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
• utils/haddock/haddock-api/src/Haddock/Options.hs
• utils/haddock/haddock-api/src/Haddock/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/haddock/haddock-api/src/Haddock/Utils.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json/Types.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Doc.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Markup.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Parser.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Parser/Util.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Types.hs
• utils/haddock/haddock-library/test/Documentation/Haddock/ParserSpec.hs
• utils/haddock/haddock-test/haddock-test.cabal
• utils/haddock/haddock-test/src/Test/Haddock/Config.hs
• utils/haddock/html-test/ref/Bug1004.html
• utils/haddock/html-test/ref/Bug973.html
• utils/haddock/html-test/ref/ConstructorPatternExport.html
• utils/haddock/html-test/ref/DefaultSignatures.html
• utils/haddock/html-test/ref/Hash.html
• utils/haddock/html-test/ref/PatternSyns.html
• utils/haddock/html-test/ref/PatternSyns2.html
• utils/haddock/html-test/ref/QuasiExpr.html
• utils/haddock/html-test/ref/Test.html
• utils/haddock/html-test/ref/TypeFamilies3.html
• utils/jsffi/prelude.mjs

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