[Git][ghc/ghc][wip/dcoutts/issue-26717] 209 commits: Simplify the treatment of static forms

Duncan Coutts pushed to branch wip/dcoutts/issue-26717 at Glasgow Haskell Compiler / GHC Commits: 4df0adf6 by Simon Peyton Jones at 2026-02-11T21:50:13-05:00 Simplify the treatment of static forms This MR implements GHC proposal 732: simplify static forms, https://github.com/ghc-proposals/ghc-proposals/pull/732 thereby addressing #26556. See `Note [Grand plan for static forms]` in GHC.Iface.Tidy.StaticPtrTable The main changes are: * There is a new, simple rule for (static e), namely that the free term variables of `e` must be bound at top level. The check is done in the `HsStatic` case of `GHC.Rename.Expr.rnExpr` * That in turn substantially simplifies the info that the typechecker carries around in its type environment. Hooray. * The desugarer emits static bindings to top level directly; see the `HsStatic` case of `dsExpr`. * There is no longer any special static-related magic in the FloatOut pass. And the main Simplifier pipeline no longer needs a special case to run FloatOut even with -O0. Hooray. All this forced an unexpected change to the pattern match checker. It recursively invokes the main Hs desugarer when it wants to take a look at a term to spot some special cases (notably constructor applications). We don't want to emit any nested (static e) bindings to top level a second time! Yikes. That forced a modest refactor in GHC.HsToCore.Pmc: * The `dsl_nablas` field of `DsLclEnv` now has a `NoPmc` case, which says "I'm desugaring just for pattern-match checking purposes". * When that flag is set we don't emit static binds. That in turn forces a cascade of refactoring, but the net effect is an improvement; less risk of duplicated (even exponential?) work. See Note [Desugaring HsExpr during pattern-match checking]. 10% metric decrease, on some architectures, of compile-time max-bytes-used on T15304. Metric Decrease: T15304 - - - - - 7922f728 by Teo Camarasu at 2026-02-11T21:50:58-05:00 ghc-internal: avoid depending on GHC.Internal.Exts This module is mostly just re-exports. It made sense as a user-facing module, but there's no good reason ghc-internal modules should depend on it and doing so linearises the module graph - move considerAccessible to GHC.Internal.Magic Previously it lived in GHC.Internal.Exts, but it really deserves to live along with the other magic function, which are already re-exported from .Exts - move maxTupleSize to GHC.Internal.Tuple This previously lived in GHC.Internal.Exts but a comment already said it should be moved to .Tuple Resolves #26832 - - - - - b6a4a29b by Eric Lee at 2026-02-11T21:51:55-05:00 Remove unused Semigroup imports to fix GHC 9.14 bootstrapping - - - - - 99d8c146 by Simon Peyton Jones at 2026-02-12T17:36:59+00:00 Fix subtle bug in cast worker/wrapper See (CWw4) in Note [Cast worker/wrapper]. The true payload is in the change to the definition of GHC.Types.Id.Info.hasInlineUnfolding Everthing else is just documentation. There is a 2% compile time decrease for T13056; I'll take the win! Metric Decrease: T13056 - - - - - 530e8e58 by Simon Peyton Jones at 2026-02-12T20:17:23-05:00 Add regression tests for four StaticPtr bugs Tickets #26545, #24464, #24773, #16981 are all solved by the recently-landed MR commit 318ee13bcffa6aa8df42ba442ccd92aa0f7e210c Author: Simon Peyton Jones <simon.peytonjones@gmail.com> Date: Mon Oct 20 23:07:20 2025 +0100 Simplify the treatment of static forms This MR just adds regression tests for them. - - - - - 4157160f by Cheng Shao at 2026-02-13T06:27:04-05:00 ci: remove unused hlint-ghc-and-base job definition This patch removes the unused `hlint-ghc-and-base` job definition, it's never run since !9806. Note that hadrian lint rules still work locally, so anyone that wishes to run hlint on the codebase can continue to do so in their local worktree. - - - - - 039f1977 by Cheng Shao at 2026-02-13T06:27:47-05:00 wasm: use import.meta.main for proper distinction of nodejs main modules This patch uses `import.meta.main` for proper distinction of nodejs main modules, especially when the main module might be installed as a symlink. Fixes #26916. - - - - - 14f485ee by ARATA Mizuki at 2026-02-17T09:09:24+09:00 Support more x86 extensions: AVX-512 {BW,DQ,VL} and GFNI Also, mark AVX-512 ER and PF as deprecated. AVX-512 instructions can be used for certain 64-bit integer vector operations. GFNI can be used to implement bitReverse (currently not used by NCG, but LLVM may use it). Closes #26406 Addresses #26509 - - - - - 016f79d5 by fendor at 2026-02-17T09:16:16-05:00 Hide implementation details from base exception stack traces Ensure we hide the implementation details of the exception throwing mechanisms: * `undefined` * `throwSTM` * `throw` * `throwIO` * `error` The `HasCallStackBacktrace` should always have a length of exactly 1, not showing internal implementation details in the stack trace, as these are vastly distracting to end users. CLC proposal [#387](https://github.com/haskell/core-libraries-committee/issues/387) - - - - - 4f2840f2 by Brian J. Cardiff at 2026-02-17T17:04:08-05:00 configure: Accept happy-2.2 In Jan 2026 happy-2.2 was released. The most sensible change is https://github.com/haskell/happy/issues/335 which didn't trigger in a fresh build - - - - - 10b4d364 by Duncan Coutts at 2026-02-17T17:04:52-05:00 Fix errors in the documentation of the eventlog STOP_THREAD status codes Fix the code for BlockedOnMsgThrowTo. Document all the known historical warts. Fixes issue #26867 - - - - - c5e15b8b by Phil de Joux at 2026-02-18T05:07:36-05:00 haddock: use snippets for all list examples - generate snippet output for docs - reduce font size to better fit snippets - Use only directive to guard html snippets - Add latex snippets for lists - - - - - d388bac1 by Phil de Joux at 2026-02-18T05:07:36-05:00 haddock: Place the snippet input and output together - Put the output seemingly inside the example box - - - - - 016fa306 by Samuel Thibault at 2026-02-18T05:08:35-05:00 Fix linking against libm by moving the -lm option For those systems that need -lm for getting math functions, this is currently added on the link line very early, before the object files being linked together. Newer toolchains enable --as-needed by default, which means -lm is ignored at that point because no object requires a math function yet. With such toolchains, we thus have to add -lm after the objects, so the linker actually includes libm in the link. - - - - - 68bd0805 by Teo Camarasu at 2026-02-18T05:09:19-05:00 ghc-internal: Move GHC.Internal.Data.Bool to base This is a tiny module that only defines bool :: Bool -> a -> a -> a. We can just move this to base and delete it from ghc-internal. If we want this functionality there we can just use a case statement or if-then expression. Resolves 26865 - - - - - 4c40df3d by fendor at 2026-02-20T10:24:48-05:00 Add optional `SrcLoc` to `StackAnnotation` class `StackAnnotation`s give access to an optional `SrcLoc` field that user-added stack annotations can use to provide better backtraces in both error messages and when decoding the callstack. We update builtin stack annotations such as `StringAnnotation` and `ShowAnnotation` to also capture the `SrcLoc` of the current `CallStack` to improve backtraces by default (if stack annotations are used). This change is backwards compatible with GHC 9.14.1. - - - - - fd9aaa28 by Simon Hengel at 2026-02-20T10:25:33-05:00 docs: Fix grammar in explicit_namespaces.rst - - - - - 44354255 by Vo Minh Thu at 2026-02-20T18:53:06-05:00 GHCi: add a :version command. This looks like: ghci> :version GHCi, version 9.11.20240322 This closes #24576. Co-Author: Markus Läll <markus.l2ll@gmail.com> - - - - - eab3dbba by Andreas Klebinger at 2026-02-20T18:53:51-05:00 hadrian/build-cabal: Better respect and utilize -j * We now respect -j<n> for the cabal invocation to build hadrian rather than hardcoding -j * We use the --semaphore flag to ensure cabal/ghc build the hadrian executable in parallel using the -jsem mechanism. Saves 10-15s on fresh builds for me. Fixes #26876 - - - - - 17839248 by Teo Camarasu at 2026-02-24T08:36:03-05:00 ghc-internal: avoid depending on GHC.Internal.Control.Monad.Fix This module contains the definition of MonadFix, since we want an instance for IO, that instance requires a lot of machinery and we want to avoid an orphan instance, this will naturally be quite high up in the dependency graph. So we want to avoid other modules depending on it as far as possible. On Windows, the IO manager depends on the RTSFlags type, which transtively depends on MonadFix. We refactor things to avoid this dependency, which would have caused a regression. Resolves #26875 Metric Decrease: T12227 - - - - - fa88d09a by Wolfgang Jeltsch at 2026-02-24T08:36:47-05:00 Refine the imports of `System.IO.OS` Commit 68bd08055594b8cbf6148a72d108786deb6c12a1 replaced the `GHC.Internal.Data.Bool` import by a `GHC.Internal.Base` import. However, while the `GHC.Internal.Data.Bool` import was conditional and partial, the `GHC.Internal.Base` import is unconditional and total. As a result, the import list is not tuned to import only the necessary bits anymore, and furthermore GHC emits a lot of warnings about redundant imports. This commit makes the `GHC.Internal.Base` import conditional and partial in the same way that the `GHC.Internal.Data.Bool` import was. - - - - - c951fef1 by Cheng Shao at 2026-02-25T20:58:28+00:00 wasm: add /assets endpoint to serve user-specified assets This patch adds an `/assets` endpoint to the wasm dyld http server, so that users can also fetch assets from the same host with sensible default MIME types, without needing a separate http server for assets that also introduces CORS headaches: - A `-fghci-browser-assets-dir` driver flag is added to specify the assets root directory (defaults to `$PWD`) - The dyld http server fetches `mime-db` on demand and uses it as source of truth for mime types. Closes #26951. - - - - - dde22f97 by Sylvain Henry at 2026-02-26T13:14:03-05:00 Fix -fcheck-prim-bounds for non constant args (#26958) Previously we were only checking bounds for constant (literal) arguments! I've refactored the code to simplify the generation of out-of-line Cmm code for the primop composed of some inline code + some call to an external Cmm function. - - - - - bd3eba86 by Vladislav Zavialov at 2026-02-27T05:48:01-05:00 Check for negative type literals in the type checker (#26861) GHC disallows negative type literals (e.g., -1), as tested by T8306 and T8412. This check is currently performed in the renamer: rnHsTyLit tyLit@(HsNumTy x i) = do when (i < 0) $ addErr $ TcRnNegativeNumTypeLiteral tyLit However, this check can be bypassed using RequiredTypeArguments (see the new test case T26861). Prior to this patch, such programs caused the compiler to hang instead of reporting a proper error. This patch addresses the issue by adding an equivalent check in the type checker, namely in tcHsType. The diff is deliberately minimal to facilitate backporting. A more comprehensive rework of HsTyLit is planned for a separate commit. - - - - - faf14e0c by Vladislav Zavialov at 2026-02-27T05:48:45-05:00 Consistent pretty-printing of HsString, HsIsString, HsStrTy Factor out a helper to pretty-print string literals, thus fixing newline handling for overloaded string literals and type literals. Test cases: T26860ppr T26860ppr_overloaded T26860ppr_tylit Follow up to ddf1434ff9bb08cfef3c93f23de6b83ec698aa27 - - - - - f108a972 by Arnaud Spiwack at 2026-02-27T12:53:01-05:00 Make list comprehension completely non-linear Fixes #25081 From the note: The usefulness of list comprehension in conjunction with linear types is dubious. After all, statements are made to be run many times, for instance in ```haskell [u | y <- [0,1], stmts] ``` both `u` and `stmts` are going to be run several times. In principle, though, there are some position in a monad comprehension expression which could be considered linear. We could try and make it so that these positions are considered linear by the typechecker, but in practice the desugarer doesn't take enough care to ensure that these are indeed desugared to linear sites. We tried in the past, and it turned out that we'd miss a desugaring corner case (#25772). Until there's a demand for this very specific improvement, let's instead be conservative, and consider list comprehension to be completely non-linear. - - - - - ae799cab by Simon Jakobi at 2026-02-27T12:53:54-05:00 PmAltConSet: Use Data.Set instead of Data.Map ...to store `PmLit`s. The Map was only used to map keys to themselves. Changing the Map to a Set saves a Word of memory per entry. Resolves #26756. - - - - - dcd7819c by Vladislav Zavialov at 2026-02-27T18:46:03-05:00 Drop HsTyLit in favor of HsLit (#26862, #25121) This patch is a small step towards unification of HsExpr and HsType, taking care of literals (HsLit) and type literals (HsTyLit). Additionally, it improves error messages for unsupported type literals, such as unboxed or fractional literals (test cases: T26862, T26862_th). Changes to the AST: * Use HsLit where HsTyLit was previously used * Use HsChar where HsCharTy was previously used * Use HsString where HsStrTy was previously used * Use HsNatural (NEW) where HsNumTy was previously used * Use HsDouble (NEW) to represent unsupported fractional type literals Changes to logic: * Parse unboxed and fractional type literals (to be rejected later) * Drop the check for negative literals in the renamer (rnHsTyLit) in favor of checking in the type checker (tc_hs_lit_ty) * Check for invalid type literals in TH (repTyLit) and report unrepresentable literals with ThUnsupportedTyLit * Allow negative type literals in TH (numTyLit). This is fine as these will be taken care of at splice time (test case: T8306_th) - - - - - c927954f by Vladislav Zavialov at 2026-02-27T18:46:50-05:00 Increase test coverage of diagnostics Add test cases for the previously untested diagnostics: [GHC-01239] PsErrIfInFunAppExpr [GHC-04807] PsErrProcInFunAppExpr [GHC-08195] PsErrInvalidRecordCon [GHC-16863] PsErrUnsupportedBoxedSumPat [GHC-18910] PsErrSemiColonsInCondCmd [GHC-24737] PsErrInvalidWhereBindInPatSynDecl [GHC-25037] PsErrCaseInFunAppExpr [GHC-25078] PsErrPrecedenceOutOfRange [GHC-28021] PsErrRecordSyntaxInPatSynDecl [GHC-35827] TcRnNonOverloadedSpecialisePragma [GHC-40845] PsErrUnpackDataCon [GHC-45106] PsErrInvalidInfixHole [GHC-50396] PsErrInvalidRuleActivationMarker [GHC-63930] MultiWayIfWithoutAlts [GHC-65536] PsErrNoSingleWhereBindInPatSynDecl [GHC-67630] PsErrMDoInFunAppExpr [GHC-70526] PsErrLetCmdInFunAppCmd [GHC-77808] PsErrDoCmdInFunAppCmd [GHC-86934] ClassPE [GHC-90355] PsErrLetInFunAppExpr [GHC-91745] CasesExprWithoutAlts [GHC-92971] PsErrCaseCmdInFunAppCmd [GHC-95644] PsErrBangPatWithoutSpace [GHC-97005] PsErrIfCmdInFunAppCmd Remove unused error constructors: [GHC-44524] PsErrExpectedHyphen [GHC-91382] TcRnIllegalKindSignature - - - - - 3a9470fd by Torsten Schmits at 2026-02-27T18:47:34-05:00 Avoid expensive computation for debug logging in `mergeDatabases` when log level is low This computed and traversed a set intersection for every single dependency unconditionally. - - - - - ea4c2cbd by Brandon Chinn at 2026-02-27T16:22:38-08:00 Implement QualifiedStrings (#26503) See Note [Implementation of QualifiedStrings] - - - - - 08bc245b by sheaf at 2026-03-01T11:11:54-05:00 Clean up join points, casts & ticks This commit shores up the logic dealing with casts and ticks occurring in between a join point binding and a jump. Fixes #26642 #26929 #26693 Makes progress on #14610 #26157 #26422 Changes: - Remove 'GHC.Types.Tickish.TickishScoping' in favour of simpler predicates 'tickishHasNoScope'/'tickishHasSoftScope', as things were before commit 993975d3. This makes the code easier to read and document (fewer indirections). - Introduce 'canCollectArgsThroughTick' for consistent handling of ticks around PrimOps and other 'Id's that cannot be eta-reduced. See overhauled Note [Ticks and mandatory eta expansion]. - New Note [JoinId vs TailCallInfo] in GHC.Core.SimpleOpt that explains robustness of JoinId vs fragility of TailCallInfo. - Allow casts/non-soft-scoped ticks to occur in between a join point binder and a jump, but only in Core Prep. See Note [Join points, casts, and ticks] and Note [Join points, casts, and ticks... in Core Prep] in GHC.Core.Opt.Simplify.Iteration. Also update Core Lint to account for this. See Note [Linting join points with casts or ticks] in GHC.Core.Lint. - Update 'GHC.Core.Utils.mergeCaseAlts' to avoid pushing a cast in between a join point binding and its jumps. This fixes #26642. See the new (MC5) and (MC6) in Note [Merge Nested Cases]. - Update float out to properly handle source note ticks. They are now properly floated out instead of being discarded. This increases the number of ticks in certain tests with -g. Test cases: T26642 and TrickyJoins. Metric increase due to more source note ticks with -g: ------------------------- Metric Increase: libdir size_hello_artifact size_hello_unicode ------------------------- - - - - - 476c4cdf by Sean D. Gillespie at 2026-03-02T10:14:37-05:00 Add SIMD absolute value on x86 and LLVM On x86, absolute value of 32 bits or less is implemented with PABSB/PABSW/PABSD if SSSE3 is available. Otherwise, there is a fallback for SSE2. For 64 bit integers it uses VPABSQ, required by AVX-512VL, with fallbacks for SSE4.2 and SSE2. There is no dedicated instruction for floating point absolute value on x86, so it is simulated using bitwise AND. Absolute value for signed integers and floats are implemented by the "llvm.abs/llvm.fabs" standard library intrinsics. This implementation uses MachOps constructors, unlike non-vector floating point absolute value, which uses CallishMachOps. - - - - - 709448c0 by Sean D. Gillespie at 2026-03-02T10:14:46-05:00 Add SIMD floating point square root On x86, this is implemented with the SQRTPS and SQRTPD instructions. On LLVM, it uses the sqrt library intrinstic. - - - - - 0deadf66 by Sean D. Gillespie at 2026-03-02T10:14:47-05:00 Improve error message for SIMD on aarch64 When encountering vector literals on aarch64, previously it would throw: <no location info>: error: panic! (the 'impossible' happened) GHC version 9.15.20251219: getRegister' (CmmLit:CmmVec): Now it is more consistent with the other vector operations: <no location info>: error: sorry! (unimplemented feature or known bug) GHC version 9.15.20251219: SIMD operations on AArch64 currently require the LLVM backend - - - - - 7d64031b by Vladislav Zavialov at 2026-03-03T11:09:28-05:00 Replace maybeAddSpace with spaceIfSingleQuote Simplify pretty-printing of HsTypes by using spaceIfSingleQuote. This allows us to drop the unwieldy lhsTypeHasLeadingPromotionQuote helper function. Follow-up to 178c1fd830c78377ef5d338406a41e1d8eb5f0da - - - - - 598db847 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00 Correct `hIsReadable` and `hIsWritable` for duplex handles This contribution implements CLC proposal #371. It changes `hIsReadable` and `hIsWritable` such that they always throw a respective exception when encountering a closed or semi-closed handle, not just in the case of a file handle. - - - - - b90201e5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00 Document `SemiClosedHandle` - - - - - c9df72b5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00 Tell users what “semi-closed” means for duplex handles - - - - - a8aa1868 by Ilias Tsitsimpis at 2026-03-06T06:26:29-05:00 Fix determinism of linker arguments The switch from Data.Map to UniqMap in 3b5be05ac29 introduced non-determinism in the order of packages passed to the linker. This resulted in non-reproducible builds where the DT_NEEDED entries in dynamic libraries were ordered differently across builds. Fix the regression by explicitly sorting the package list derived from UniqMap. Fixes #26838 - - - - - 9b64ad3a by Matthew Pickering at 2026-03-06T06:27:16-05:00 determinism: Use a deterministic renaming when writing bytecode files Now when writing the bytecode file, a counter and substitution are used to provide deterministic keys to local variables (rather than relying on uniques). This change ensures that `.gbc` are produced deterministically. Fixes #26499 - - - - - d29800e0 by Teo Camarasu at 2026-03-06T06:28:46-05:00 ghc-internal: delete Version hs-boot loop Version has a Read instance which needs Unicode but part of the Unicode interface is the unicode version. This is easy to resolve. We simply don't re-export the version from the Unicode module. Resolves #26940 - - - - - ad25af90 by Sylvain Henry at 2026-03-06T06:30:33-05:00 Linker: implement support for COMMON symbols (#6107) Add some support for COMMON symbols. We don't support common symbols having different sizes where the larger one is allocated after the smaller one. The linker will fail with an appropriate error message if it happens. - - - - - 3b59f158 by Cheng Shao at 2026-03-06T06:31:16-05:00 compiler: fix redundant import of GHC.Hs.Lit This patch removes a redundant import of `GHC.Hs.Lit` which causes a ghc build failure with validate flavours when bootstrapping from 9.14. Fixes #26972. - - - - - 148d36f3 by Cheng Shao at 2026-03-06T06:32:01-05:00 compiler: avoid unneeded traversals in GHC.Unit.State Following !15591, this patch avoids unneeded traversals in `reportCycles`/`reportUnusable` when log verbosity is below given threshold. Also applies `logVerbAtLeast` when appropriate. Co-authored-by: Codex <codex@openai.com> - - - - - 7e31367c by Cheng Shao at 2026-03-06T06:32:46-05:00 ghc-internal: fix redundant import in GHC.Internal.Event.Windows.ManagedThreadPool This patch fixes redundant import in `GHC.Internal.Event.Windows.ManagedThreadPool` that causes a compilation error when building windows target with validate flavours and bootstrapping from 9.14. Fixes #26976. - - - - - fc8b8e27 by sheaf at 2026-03-06T06:33:28-05:00 System.Info.fullCompilerVersion: add 'since' annot Fixes #26973 - - - - - c8238375 by Sylvain Henry at 2026-03-06T06:34:23-05:00 Hadrian: deprecate --bignum and automatically enable +native_bignum for JS Deprecate --bignum=... to select the bignum backend. It's only used to select the native backend, and this can be done with the +native_bignum flavour transformer. Additionally, we automatically enable +native_bignum for the JS target because the GMP backend isn't supported. - - - - - a3ac7074 by Sylvain Henry at 2026-03-06T06:35:17-05:00 JS: fix putEnum/fromEnum (#24593) Don't go through Word16 when serializing Enums. - - - - - 0b36e96c by Andreas Klebinger at 2026-03-06T06:35:58-05:00 Docs: Document -fworker-wrapper-cbv default setting. Fixes #26841 - - - - - eca445e7 by mangoiv at 2026-03-07T05:02:36-05:00 drop deb9/10 from CI, add deb13 debian 9 and 10 are end of life, hence we drop them from our CI, but we do add debian 13. Jobs that were previously run on 9 and 10 run on 13, too, jobs that were run on 10, are run on 11 now. Jobs that were previously run on debian 12 are run on debian 13 now. This MR also updates hadrian's bootstrap plans for that reason. Metric Decrease: T9872d - - - - - 12f8b829 by Luite Stegeman at 2026-03-07T05:03:33-05:00 Fix GHC.Internal.Prim haddock Haddock used to parse Haskell source to generate documentation, but switched to using interface files instead. This broke documentation of the GHC.Internal.Prim module, since it's a wired-in interface that didn't provide a document structure. This patch adds the missing document structure and updates genprimopcode to make the section headers and descriptions available. fixes #26954 - - - - - f87e5e57 by Luite Stegeman at 2026-03-07T05:03:33-05:00 Remove obsolete --make-haskell-source from genprimopcode Now that haddock uses the wired-in interface for GHC.Internal.Prim, the generated Haskell source file is no longer needed. Remove the --make-haskell-source code generator from genprimopcode and replace the generated GHC/Internal/Prim.hs with a minimal static source file. - - - - - 4a7ddc7b by Sylvain Henry at 2026-03-07T05:04:59-05:00 JS: fix linking of exposed but non-preload units (#24886) Units exposed in the unit database but not explicitly passed on the command-line were not considered by the JS linker. This isn't an issue for cabal which passes every unit explicitly but it is an issue when using GHC directly (cf T24886 test). - - - - - 689aafcd by mangoiv at 2026-03-07T05:05:52-05:00 testsuite: double foundation timeout multiplier The runtime timeout in the foundation test was regularly hit by code generated by the wasm backend - we increase the timout since the high runtime is expected on the wasm backend for this rather complex test. Resolves #26938 - - - - - a46a1bb1 by Cheng Shao at 2026-03-09T04:50:30-04:00 compiler: add myCapabilityExpr to GHC.Cmm.Utils This commit adds `myCapabilityExpr` to `GHC.Cmm.Utils` which is computed from `BaseReg`. It's convenient for codegen logic where one needs to pass the current Capability's pointer. - - - - - 4afc65b1 by Cheng Shao at 2026-03-09T04:50:30-04:00 compiler: lower tryPutMVar# into a ccall directly This patch addresses an old TODO of `stg_tryPutMVarzh` by removing it completely and making the compiler lower `tryPutMVar#` into a ccall to `performTryPutMVar` directly, without landing into an intermediate C or Cmm function. `performTryPutMVar` is promoted to a public RTS function with default visibility, and the compiler lowering logic takes into account the C ABI of `performTryPutMVar` and converts from C Bool to primop's `Int#` result properly. - - - - - 9e3d6a58 by Simon Hengel at 2026-03-09T04:51:15-04:00 Don't use #line in haddocks This confuses the parser. Haddock output is unaffected by this change. (read: this still produces the same documentation) - - - - - f4e8fec2 by Wolfgang Jeltsch at 2026-03-09T04:52:01-04:00 Remove in-package dependencies on `GHC.Internal.System.IO` This contribution eliminates all dependencies on `GHC.Internal.System.IO` from within `ghc-internal`. It comprises the following changes: * Make `GHC.Internal.Fingerprint` independent of I/O support * Tighten the dependencies of `GHC.Internal.Data.Version` * Tighten the dependencies of `GHC.Internal.TH.Monad` * Tighten the dependencies of `GHCi.Helpers` * Move some code that needs `System.IO` to `template-haskell` * Move the `GHC.ResponseFile` implementation into `base` * Move the `System.Exit` implementation into `base` * Move the `System.IO.OS` implementation into `base` Metric Decrease: size_hello_artifact size_hello_artifact_gzip size_hello_unicode size_hello_unicode_gzip - - - - - 91df4c82 by Sylvain Henry at 2026-03-09T04:53:20-04:00 T18832: fix Windows CI failure by dropping removeDirectoryRecursive On Windows, open file handles prevent deletion. After killThread, the closer thread may not have called hClose yet, causing removeDirectoryRecursive to fail with "permission denied". The test harness cleans up the run directory anyway, so the call is redundant. - - - - - d7fe9671 by Cheng Shao at 2026-03-09T04:54:04-04:00 compiler: fix redundant import in GHC.StgToJS.Object This patch fixes a redundant import in GHC.StgToJS.Object that causes a build failure when compiling head from 9.14 with validate flavours. Fixes #26991. - - - - - 0bfd29c3 by Cheng Shao at 2026-03-09T04:54:46-04:00 wasm: fix `Illegal foreign declaration` failure when ghci loads modules with JSFFI exports This patch fixes a wasm ghci error when loading modules with JSFFI exports; the `backendValidityOfCExport` check in `tcCheckFEType` should only makes sense and should be performed when not checking the JavaScript calling convention; otherwise, when the calling convention is JavaScript, the codegen logic should be trusted to backends that actually make use of it. Fixes #26998. - - - - - e659610c by Duncan Coutts at 2026-03-09T12:08:35-04:00 Apply NOINLINE pragmas to generated Typeable bindings For context, see the existing Note [Grand plan for Typeable] and the Note [NOINLINE on generated Typeable bindings] added in the subsequent commit. This is about reducing the number of exported top level names and unfoldings, which reduces interface file sizes and reduces the number of global/dynamic linker symbols. Also accept the changed test output and metric decreases. Tests that record the phase output for type checking or for simplifier end up with different output: the generated bindings now have an Inline [~] annotation, and many top level names are now local rather than module-prefixed for export. Also accept the numerous metric decreases in compile_time/bytes allocated, and a few in compile_time/max_bytes_used. There's also one instance of a decrease in runtime/max_bytes_used but it's a ghci-way test and so presumably the reason is that it loads smaller .hi files and/or links fewer symbols. ------------------------- Metric Decrease: CoOpt_Singletons MultiLayerModulesTH_OneShot MultilineStringsPerf T10421 T10547 T12150 T12227 T12234 T12425 T13035 T13056 T13253 T13253-spj T15304 T15703 T16875 T17836b T17977b T18140 T18223 T18282 T18304 T18698a T18698b T18730 T18923 T20049 T21839c T24471 T24582 T24984 T3064 T4029 T5030 T5642 T5837 T6048 T9020 T9198 T9961 TcPlugin_RewritePerf WWRec hard_hole_fits mhu-perf ------------------------- - - - - - 67df5161 by Duncan Coutts at 2026-03-09T12:08:35-04:00 Add documentation Note [NOINLINE on generated Typeable bindings] and refer to it from the code and existing documentation. - - - - - c4ad6167 by Duncan Coutts at 2026-03-09T12:08:35-04:00 Switch existing note to "named wrinkle" style, (GPT1)..(GPT7) GPT = Grand plan for Typeable - - - - - dc84f8e2 by Cheng Shao at 2026-03-09T12:09:21-04:00 ci: only build deb13 for validate pipeline aarch64-linux jobs This patch drops the redundant aarch64-linux deb12 job from validate pipelines and only keeps deb13; it's still built in nightly/release pipelines. Closes #27004. - - - - - 23a50772 by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00 chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to GHC.Internal.TH.Monad and delete the Quote module. Update submodule template-haskell-quasiquoter to use the merged upstream version that imports from the correct module. Co-authored-by: Cursor <cursoragent@cursor.com> - - - - - a2bb6fc3 by Simon Jakobi at 2026-03-10T14:12:23-04:00 Add regression test for #16122 - - - - - 604e1180 by Cheng Shao at 2026-03-11T15:00:42-04:00 hadrian: remove the broken bench flavour This patch removes the bench flavour from hadrian which has been broken for years and not used for actual benchmarking (for which `perf`/`release` is used instead). Closes #26825. - - - - - c3e64915 by Simon Jakobi at 2026-03-11T15:01:31-04:00 Add regression test for #18186 The original TypeInType language extension is replaced with DataKinds+PolyKinds for compatibility. Closes #18186. - - - - - 664996c7 by Andreas Klebinger at 2026-03-11T15:02:16-04:00 Bump nofib submodule. We accrued a number of nofib fixes we want to have here. - - - - - 517cf64e by Simon Jakobi at 2026-03-11T15:03:03-04:00 Add regression test for #15907 Closes #15907. - - - - - fff362cf by Simon Jakobi at 2026-03-11T15:03:49-04:00 Ensure T14272 is run in optasm way Closes #16539. - - - - - ec81ec2c by Simon Jakobi at 2026-03-11T15:03:49-04:00 Add regression test for #24632 Closes #24632. - - - - - cefec47b by Simon Jakobi at 2026-03-11T15:03:50-04:00 Fix module name of T9675: T6975 -> T9675 - - - - - d3690ae8 by Andreas Klebinger at 2026-03-11T15:04:31-04:00 User guide: Clarify phase control on INLINEABLE[foo] pragmas. Fixes #26851 - - - - - e7054934 by Simon Jakobi at 2026-03-11T15:05:16-04:00 Add regression test for #12694 Closes #12694. - - - - - 4756d9f6 by Simon Jakobi at 2026-03-11T15:05:16-04:00 Add regression test for #16275 Closes #16275. - - - - - 34b7e2c1 by Simon Jakobi at 2026-03-11T15:05:16-04:00 Add regression test for #14908 Closes #14908. - - - - - 4243db3d by Simon Jakobi at 2026-03-11T15:05:16-04:00 Add regression test for #14151 Closes #14151. - - - - - 0e9f1453 by Simon Jakobi at 2026-03-11T15:05:16-04:00 Add regression test for #12640 Closes #12640. - - - - - ae606c7f by Simon Jakobi at 2026-03-11T15:05:16-04:00 Add regression test for #15588 Closes #15588. - - - - - 5a38ce4e by Simon Jakobi at 2026-03-11T15:05:16-04:00 Add regression test for #9445 Closes #9445. - - - - - d054b467 by Cheng Shao at 2026-03-11T15:05:59-04:00 compiler: implement string interning logic for BCONPtrFS This patch adds a `FastStringEnv`-based cache of `MallocStrings` requests to `Interp`, so that when we load bytecode with many breakpoints that share the same module names & unit ids, we reuse the allocated remote pointers instead of issuing duplicte `MallocStrings` requests and bloating the C heap. Closes #26995. - - - - - b85a0293 by Simon Jakobi at 2026-03-11T15:06:41-04:00 Add perf test for #1216 Closes #1216. - - - - - cd7f7420 by Sylvain Henry at 2026-03-11T15:07:58-04:00 JS: check that tuple constructors are linked (#23709) Test js-mk_tup was failing before because tuple constructors weren't linked in. It's no longer an issue after the linker fixes. - - - - - d57f01a4 by Matthew Pickering at 2026-03-11T15:08:40-04:00 testsuite: Add test for foreign import prim with unboxed tuple return This commit just adds a test that foreign import prim works with unboxed sums. - - - - - 23d111ce by Matthew Pickering at 2026-03-11T15:08:41-04:00 Return a valid pointer in advanceStackFrameLocationzh When there is no next stack chunk, `advanceStackFrameLocationzh` used to return NULL in the pointer-typed StackSnapshot# result slot. Even though the caller treats that case as "no next frame", the result is still materialized in a GC-visible pointer slot. If a GC observes the raw NULL there, stack decoding can crash. Fix this by ensuring the dead pointer slot contains a valid closure pointer. Also make the optional result explicit by returning an unboxed sum instead of a tuple with a separate tag. Fixes #27009 - - - - - 4c58a3ae by Cheng Shao at 2026-03-11T15:09:22-04:00 hadrian: build profiled dynamic objects with -dynamic-too This patch enables hadrian to build profiled dynamic objects with `-dynamic-too`, addressing a build parallelism bottleneck in release pipelines. Closes #27010. - - - - - 870243e4 by Zubin Duggal at 2026-03-12T17:33:28+05:30 DmdAnal: Take stable unfoldings into account when determining argument demands Previously, demand analysis only looked at the RHS to compute argument demands. If the optimised RHS discarded uses of an argument that the stable unfolding still needed, it would be incorrectly marked absent. Worker/wrapper would then replace it with LitRubbish, and inlining the stable unfolding would use the rubbish value, causing a segfault. To fix, we introduce addUnfoldingDemands which analyses the stable unfolding with dmdAnal and combines its DmdType with the RHS's via the new `maxDmdType` which combines the demands of the stable unfolding with the rhs, so we can avoid any situation where we give an absent demand to something which is still used by the stable unfolding. Fixes #26416. - - - - - 669d09f9 by Cheng Shao at 2026-03-13T15:06:07-04:00 hadrian: remove redundant library/rts ways definitions from stock flavours This patch removes redundant library/rts ways definitions from stock flavours in hadrian; they can be replaced by applying appropriate filters on `defaultFlavour`. - - - - - a27dc081 by Teo Camarasu at 2026-03-13T15:06:51-04:00 ghc-internal: move bits Weak of finalizer interface to base We move parts of the Weak finalizer interface to `base` only the parts that the RTS needs to know about are kept in `ghc-internal`. This lets us then prune our imports somewhat and get rid of some SOURCE imports. Resolves #26985 - - - - - 6eef855b by Sylvain Henry at 2026-03-13T15:08:18-04:00 Stg/Unarise: constant-folding during unarisation (#25650) When building an unboxed sum from a literal argument, mkUbxSum previously emitted a runtime cast via `case primop [lit] of var -> ...`. This wrapper prevented GHC from recognising the result as a static StgRhsCon, causing top-level closures to be allocated as thunks instead of being statically allocated. Fix: try to perform the numeric literal cast at compile time using mkLitNumberWrap (wrapping semantics). If successful, return the cast literal directly with an identity wrapper (no case expression). The runtime cast path is kept as fallback for non-literal arguments. Test: codeGen/should_compile/T25650 - - - - - 905f8723 by Simon Jakobi at 2026-03-13T15:09:09-04:00 Add regression test for #2057 Test that GHC stops after an interface-file error instead of continuing into the linker. The test constructs a stale package dependency on purpose. `pkgB` is compiled against one version of package `A`, then the same unit id is replaced by an incompatible build of `A`. When `Main` imports `B`, GHC has to read `B.hi`, finds an unfolding that still mentions the old `A`, and should fail while loading interfaces. Closes #2057. Assisted-by: Codex - - - - - a13245a9 by Sylvain Henry at 2026-03-13T15:10:06-04:00 JS: fix recompilation avoidance (#23013) - we were checking the mtime of the *.jsexe directory, not of a file - we were not computing the PkgsLoaded at all - - - - - 07442653 by Cheng Shao at 2026-03-13T15:10:51-04:00 hadrian: bump index state & bootstrap plans This patch bumps hadrian index state & bootstrap plans: - The updated index state allows bootstrapping from 9.14 without cabal allow-newer hacks - The updated bootstrap plans all contain shake-0.19.9 containing important bugfix, allowing a subsequent patch to bump shake bound to ensure the bugfix is included - ghc 9.14.1 bootstrap plan is added - - - - - fdc1dbad by Cheng Shao at 2026-03-13T15:10:51-04:00 ci: add ghc 9.14.1 to bootstrap matrix This patch adds ghc 9.14.1 to bootstrap matrix, so that we test bootstrapping from ghc 9.14.1. - - - - - 91916079 by Sylvain Henry at 2026-03-13T15:11:43-04:00 T17912: wait for opener thread to block before killing it (#24739) Instead of a fixed 1000ms delay, poll threadStatus until the opener thread is in BlockedOnForeignCall, ensuring killThread only fires once the thread is provably inside the blocking open() syscall. This prevents the test from accidentally passing on Windows due to scheduling races. - - - - - baa4ebb4 by Cheng Shao at 2026-03-13T15:12:26-04:00 template-haskell: fix redundant import in Language.Haskell.TH.Quote This patch fixes a redundant import in `Language.Haskell.TH.Quote` that causes a ghc build failure when bootstrapping from 9.14 with validate flavours. Fixes #27014. - - - - - 02e68a86 by Brandon Simmons at 2026-03-13T15:13:19-04:00 Add a cumulative gc_sync_elapsed_ns counter to GHC.Internal.Stats This makes it possible to get an accurate view of time spent in sync phase when using prometheus-style sampling. Previously this was only available for the most recent GC. This intentionally leaves GHC.Stats API unchanged since it is marked as deprecated, and API changes there require CLC approval. Fixes #26944 - - - - - a18fa3c1 by Cheng Shao at 2026-03-14T05:12:14-04:00 configure: make $LLVMAS default to $CC when $CcLlvmBackend is YES This patch changes the $LLVMAS detection logic in configure so that when it's not manually specified by the user, it defaults to $CC if $CcLlvmBackend is YES. It's a more sensible default than auto-detected clang from the environment, especially when cross-compiling, $CC as the cross target's LLVM assembler is more compatible with the use case than the system-wide clang. Fixes #26769. - - - - - 3774086e by Matthew Pickering at 2026-03-14T05:13:00-04:00 exceptions: annotate onException continuation with WhileHandling Before this patch, an exception thrown in the `onException` handler would loose track of where the original exception was thrown. ``` import Control.Exception main :: IO () main = failingAction `onException` failingCleanup where failingAction = throwIO (ErrorCall "outer failure") failingCleanup = throwIO (ErrorCall "cleanup failure") ``` would report ``` T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall: cleanup failure HasCallStack backtrace: throwIO, called at T28399.hs:<line>:<column> in <package-id>:Main ``` notice that the "outer failure" exception is not present in the error message. With this patch, any exception thrown is in the handler is annotated with WhileHandling. The resulting message looks like ``` T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall: cleanup failure While handling outer failure HasCallStack backtrace: throwIO, called at T28399.hs:7:22 in main:Main ``` CLC Proposal: https://github.com/haskell/core-libraries-committee/issues/397 Fixes #26759 - - - - - 63ae8eb3 by Andreas Klebinger at 2026-03-14T05:13:43-04:00 Fix missing profiling header for origin_thunk frame. Fixes #27007 - - - - - 213d2c0e by Cheng Shao at 2026-03-14T05:14:28-04:00 ci: fix ci-images revision The current ci-images revision was a commit on the WIP branch of https://gitlab.haskell.org/ghc/ci-images/-/merge_requests/183, and it's not on the current ci-images master branch. This patch fixes the image revision to use the current tip of ci-images master. - - - - - fc2b083f by Andreas Klebinger at 2026-03-14T05:15:14-04:00 Revert "hadrian/build-cabal: Better respect and utilize -j" This reverts commit eab3dbba79650e6046efca79133b4c0a5257613d. While it's neat this currently isn't well supported on all platforms. It's time will come, but for now I'm reverting this to avoid issues for users on slightly unconvential platforms. This will be tracked at #26977. - - - - - 12a706cf by Cheng Shao at 2026-03-14T16:37:54-04:00 base: fix redundant imports in GHC.Internal.Weak.Finalize This patch fixes redundant imports in GHC.Internal.Weak.Finalize that causes a regression in bootstrapping head from 9.14 with validate flavours. Fixes #27026. - - - - - b5d39cad by Matthew Pickering at 2026-03-14T16:38:37-04:00 Use explicit syntax rather than pure - - - - - 43638643 by Andreas Klebinger at 2026-03-15T18:15:48-04:00 Configure: Fix check for --target support in stage0 CC The check FP_PROG_CC_LINKER_TARGET used $CC unconditionally to check for --target support. However this fails for the stage0 config where the C compiler used is not $CC but $CC_STAGE0. Since we already pass the compiler under test into the macro I simply changed it to use that instead. Fixes #26999 - - - - - 18fd0df6 by Simon Hengel at 2026-03-15T18:16:33-04:00 Fix typo in recursive_do.rst - - - - - 86bd9bfc by fendor at 2026-03-17T23:46:09-04:00 Introduce `-fimport-loaded-targets` GHCi flag This new flag automatically adds all loaded targets to the GHCi session by adding an `InteractiveImport` for the loaded targets. By default, this flag is disabled, as it potentially increases memory-usage. This interacts with the flag `-fno-load-initial-targets` as follows: * If no module is loaded, no module is added as an interactive import. * If a reload loads up to a module, all loaded modules are added as interactive imports. * Unloading modules removes them from the interactive context. Fixes #26866 by rendering the use of a `-ghci-script` to achieve the same thing redundant. - - - - - e3d4c1bb by mniip at 2026-03-17T23:47:03-04:00 ghc-internal: Remove GHC.Internal.Data.Eq It served no purpose other than being a re-export. - - - - - 6f4f6cf0 by mniip at 2026-03-17T23:47:03-04:00 ghc-internal: Refine GHC.Internal.Base imports Removed re-exports from GHC.Internal.Base. This reveals some modules that don't actually use anything *defined* in GHC.Internal.Base, and that can be pushed down a little in the import graph. Replaced most imports of GHC.Internal.Base with non-wildcard imports from modules where the identifiers are actually defined. Part of #26834 Metric Decrease: T5321FD - - - - - 7fb51f54 by mangoiv at 2026-03-17T23:48:00-04:00 ci: clone, don't copy when creating the cabal cache Also removed WINDOWS_HOST variable detected via uname - we now just check whether the CI job has windows in its name. This works because we only ever care about it if the respective job is not a cross job. We also statically detect darwin cross jobs in the same way. We only ever have darwin -> darwin cross jobs so this is enough to detect the host reliably. - - - - - f8817879 by mangoiv at 2026-03-17T23:48:44-04:00 ci: mark size_hello_artifact fragile on darwin x86 The size of the x86_64 hello artifact is not stable which results in flaky testruns. Resolves #26814 - - - - - e34cb6da by Adam Gundry at 2026-03-20T12:20:00-04:00 ghci: Mention active language edition in startup banner Per GHC proposal 632, this makes the GHCi startup banner include the active language edition, plus an indication of whether this was the default (as opposed to being explicitly selected via an option such as `-XGHC2024`). For example: ``` $ ghci GHCi, version 9.14.1: https://www.haskell.org/ghc/ :? for help Using default language edition: GHC2024 ghci> ``` Fixes #26037. - - - - - 52c3e6ba by sheaf at 2026-03-20T12:21:09-04:00 Improve incomplete record selector warnings This commit stops GHC from emitting spurious incomplete record selector warnings for bare selectors/projections such as .fld There are two places we currently emit incomplete record selector warnings: 1. In the desugarer, when we see a record selector or an occurrence of 'getField'. Here, we can use pattern matching information to ensure we don't give false positives. 2. In the typechecker, which might sometimes give false positives but can emit warnings in cases that the pattern match checker would otherwise miss. This is explained in Note [Detecting incomplete record selectors] in GHC.HsToCore.Pmc. Now, we obviously don't want to emit the same error twice, and generally we prefer (1), as those messages contain fewer false positives. So we suppress (2) when we are sure we are going to emit (1); the logic for doing so is in GHC.Tc.Instance.Class.warnIncompleteRecSel, and works by looking at the CtOrigin. Now, the issue was that this logic handled explicit record selectors as well as overloaded record field selectors such as "x.r" (which turns into a simple GetFieldOrigin CtOrigin), but it didn't properly handle record projectors like ".fld" or ".fld1.fld2" (which result in other CtOrigins such as 'RecordFieldProjectionOrigin'). To solve this problem, we re-use the 'isHasFieldOrigin' introduced in fbdc623a (slightly adjusted). On the way, we also had to update the desugarer with special handling for the 'ExpandedThingTc' case in 'ds_app', to make sure that 'ds_app_var' sees all the type arguments to 'getField' in order for it to indeed emit warnings like in (1). Fixes #26686 - - - - - 309d7e87 by Cheng Shao at 2026-03-20T12:21:53-04:00 rts: opportunistically grow the MutableByteArray# in-place in resizeMutableByteArray# Following !15234, this patch improves `resizeMutableByteArray#` memory efficiency by growing the `MutableByteArray#` in-place if possible, addressing an old todo comment here. Also adds a new test case `resizeMutableByteArrayInPlace` that stresses this behavior. - - - - - 7d4ef162 by Matthew Craven at 2026-03-20T12:22:47-04:00 Change representation of floating point literals This commit changes the representation of floating point literals throughough the compiler, in particular in Core and Cmm. The Rational type is deficient for this purpose, dealing poorly with NaN, +/-Infinity, and negative zero. Instead, the new module GHC.Types.Literal.Floating uses the host Float/Double type to represent NaNs, infinities and negative zero. It also contains a Rational constructor, for the benefit of -fexcess-precision. Other changes: - Remove Note [negative zero] and related code This also removes the restrictions on constant-folding of division by zero, and should make any problems with NaN/Infinity more obvious. - Use -0.0 as the additive identity for Core constant folding rules for floating-point addition, fixing #21227. - Manual worker-wrapper for GHC.Float.rationalToDouble. This is intended to prevent the compiler's WW on this function from interfering with constant-folding. This change means that we now avoid allocating a box for the result of a 'realToFrac' call in T10359. - Combine floatDecodeOp and doubleDecodeOp. This change also fixes a bug in doubleDecodeOp wherein it would incorrectly produce an Int# instead of an Int64# literal for the mantissa component with 64-bit targets. - Use Float/Double for assembly immediates, and update the X86 and PowerPC backends to properly handle special values such as NaN and infinity. - Allow 'rational_to' to handle zero denominators, fixing a TODO in GHC.Core.Opt.ConstantFold. Fixes #8364 #9811 #18897 #21227 Progress towards #26919 Metric Decrease: T10359 Co-authored-by: sheaf <sam.derbyshire@gmail.com> ------------------------- Metric Decrease: T1969 T5321FD ------------------------- - - - - - 80e2dd4f by Zubin Duggal at 2026-03-20T12:23:33-04:00 compiler/ffi: Collapse void pointer chains in capi wrappers New gcc/clang treat -Wincompatible-pointer-types as an error by default. Since C only allows implicit conversion from void*, not void**, capi wrappers for functions taking e.g. abstract** would fail to compile when the Haskell type Ptr (Ptr Abstract) was naively translated to void**. Collapse nested void pointers to a single void* when the pointee type has no known C representation. Fixes #26852 - - - - - 1c50bd7b by Luite Stegeman at 2026-03-20T12:24:37-04:00 Move some functions related to pointer tagging to a separate module - - - - - bfd7aafd by Luite Stegeman at 2026-03-20T12:24:37-04:00 Branchless unpacking for enumeration types Change unpacking for enumeration types to go to Word8#/Word16#/Word# directly instead of going through an intermediate unboxed sum. This allows us to do a branchless conversion using DataToTag and TagToEnum. Fixes #26970 - - - - - 72b20fc0 by Luite Stegeman at 2026-03-20T12:25:30-04:00 bytecode: Carefully SLIDE off the end of a stack chunk The SLIDE bytecode instruction was not checking for stack chunk boundaries and could corrupt the stack underflow frame, leading to crashes. We add a check to use safe writes if we cross the chunk boundary and also handle stack underflow if Sp is advanced past the underflow frame. fix #27001 - - - - - 2e22b43c by Cheng Shao at 2026-03-20T12:26:14-04:00 ghci: serialize BCOByteArray buffer directly when possible This patch changes the `Binary` instances of `BCOByteArray` to directly serialize the underlying buffer when possible, while also taking into account the issue of host-dependent `Word` width. See added comments and amended `Note [BCOByteArray serialization]` for detailed explanation. Closes #27020. - - - - - 89d9ba37 by Sylvain Henry at 2026-03-20T12:27:34-04:00 JS: replace BigInt with Number arithmetic for 32/64-bit quot/rem (#23597) Replace BigInt-based implementations of quotWord32, remWord32, quotRemWord32, quotRem2Word32, quotWord64, remWord64, quotInt64, and remInt64 with pure Number (double/integer) arithmetic to avoid the overhead of BigInt promotion. - - - - - ae4ddd60 by Sylvain Henry at 2026-03-20T12:28:28-04:00 Core: add constant-folding rules for Addr# eq/ne (#18032) - - - - - 3e767f98 by Matthew Pickering at 2026-03-20T12:29:11-04:00 Use OsPath rather than FilePath in Downsweep cache This gets us one step closure to uniformly using `OsPath` in the compiler. - - - - - 2c57de29 by Cheng Shao at 2026-03-20T12:29:55-04:00 hadrian: fix ghc-in-ghci flavour stage0 shared libraries This patch fixes missing stage0 shared libraries in hadrian ghc-in-ghci flavour, which was accidentally dropped in 669d09f950a6e88b903d9fd8a7571531774d4d5d and resulted in a regression in HLS support on linux/macos. Fixes #27057. - - - - - 5b1be555 by Sylvain Henry at 2026-03-20T12:30:48-04:00 JS: install rts/Types.h header file (#27033) It was an omission, making HsFFI.h not usable with GHC using the JS backend. - - - - - b883f08f by Cheng Shao at 2026-03-20T12:31:33-04:00 hadrian: don't compile RTS with -Winline This patch removes `-Winline` from cflags when compiling the RTS, given that: 1. It generates a huge pile of spam and hurts developer experience 2. Whether inlining happens is highly dependent on toolchains, flavours, etc, and it's not really an issue to fix if inlining doesn't happen; it's a hint to the C compiler anyway. Fixes #27060. - - - - - 333387d6 by Cheng Shao at 2026-03-20T12:31:33-04:00 hadrian: compile libffi-clib with -Wno-deprecated-declarations This patch adds `-Wno-deprecated-declarations` to cflags of `libffi-clib`, given that it produces noise at compile-time that aren't really our issue to fix anyway, it's from vendored libffi source code. - - - - - 67c47771 by Rodrigo Mesquita at 2026-03-20T12:32:17-04:00 Expose decodeStackWithIpe from ghc-experimental This decoding is useful to the debugger and it wasn't originally exported as an oversight. - - - - - 18513365 by Matthew Pickering at 2026-03-21T04:43:26-04:00 Add support for custom external interpreter commands It can be useful for GHC API clients to implement their own external interpreter commands. For example, the debugger may want an efficient way to inspect the stacks of the running threads in the external interpreter. - - - - - 4636d906 by mangoiv at 2026-03-21T04:44:10-04:00 ci: remove obsolete fallback for old debian and ubuntu versions - - - - - 2e3a2805 by mangoiv at 2026-03-21T04:44:10-04:00 ci: drop ubuntu 18 and 20 Ubuntu 18 EOL: May 2023 Ubuntu 20 EOL: May 2025 We should probably not make another major release supporting these platforms. Also updates the generator script. Resolves #25876 - - - - - de54e264 by Cheng Shao at 2026-03-21T17:52:08+01:00 rts: fix -Wcompare-distinct-pointer-types errors This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. - - - - - b9bd73de by Cheng Shao at 2026-03-21T17:52:08+01:00 ghc-internal: fix unused imports This commit fixes unused imports in `ghc-internal` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #26987 #27059. - - - - - da946a16 by Cheng Shao at 2026-03-21T17:03:51+00:00 ghci: fix unused imports This commit fixes unused imports in `ghci` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #26987 #27059. - - - - - 955b1cf8 by Cheng Shao at 2026-03-21T17:03:51+00:00 compiler: fix unused imports in GHC.Tc.Types.Origin This commit fixes unused imports in `GHC.Tc.Types.Origin` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #27059. - - - - - 3b1aeb50 by Cheng Shao at 2026-03-21T17:03:51+00:00 hadrian: fix missing +werror in validate flavour This patch fixes missing `+werror` in validate flavour, which was an oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066. - - - - - 44f118f0 by Cheng Shao at 2026-03-22T04:54:01-04:00 ci: bump CACHE_REV and add the missing reminder This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI errors due to stale cabal cache on some runners, and also adds a reminder to remind future maintainers. Fixes #27075. - - - - - 2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00 Add 128-bit SIMD support to AArch64 NCG Changes: - Add `Format` field to vector-capable instructions. These instructions will emit `vN.4s` (for example) as a operand. - Additional constructors for `Operand`: `OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example). `OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example). - Integer quot/rem are implemented in C, like x86. Closes #26536 Metric Increase: T3294 - - - - - 5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00 AArch64 NCG: Improve code generation for floating-point and vector constants Some floating-point constants can be directly encoded using the FMOV instruction. Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI. - - - - - c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00 Add regression test for #13729 Closes #13729. - - - - - aa5dfe67 by Sylvain Henry at 2026-03-26T03:48:56-04:00 Check that shift values are valid In GHC's codebase in non-DEBUG builds we silently substitute shiftL/R with unsafeShiftL/R for performance reasons. However we were not checking that the shift value was valid for unsafeShiftL/R, leading to wrong computations, but only in non-DEBUG builds. This patch adds the necessary checks and reports an error when a wrong shift value is passed. - - - - - c8a7b588 by Sylvain Henry at 2026-03-26T03:48:56-04:00 Implement basic value range analysis (#25718) Perform basic value range analysis to try to determine at compile time the result of the application of some comparison primops (ltWord#, etc.). This subsumes the built-in rewrite rules used previously to check if one of the comparison argument was a bound (e.g. (x :: Word8) <= 255 is always True). Our analysis is more powerful and handles type conversions: e.g. word8ToWord x <= 255 is now detected as always True too. We also use value range analysis to filter unreachable alternatives in case-expressions. To support this, we had to allow case-expressions for primitive types to not have a DEFAULT alternative (as was assumed before and checked in Core lint). - - - - - a5ec467e by ARATA Mizuki at 2026-03-26T03:49:49-04:00 rts: Align stack to 64-byte boundary in StgRun on x86 When LLVM spills AVX/AVX-512 vector registers to the stack, it requires 32-byte (__m256) or 64-byte (__m512) alignment. If the stack is not sufficiently aligned, LLVM inserts a realignment prologue that reserves %rbp as a frame pointer, conflicting with GHC's use of %rbp as an STG callee-saved register and breaking the tail-call-based calling convention. Previously, GHC worked around this by lying to LLVM about the stack alignment and rewriting aligned vector loads/stores (VMOVDQA, VMOVAPS) to unaligned ones (VMOVDQU, VMOVUPS) in the LLVM Mangler. This had two problems: - It did not extend to AVX-512, which requires 64-byte alignment. (#26595) - When Haskell calls a C function that takes __m256/__m512 arguments on the stack, the callee requires genuine alignment, which could cause a segfault. (#26822) This patch genuinely aligns the stack to 64 bytes in StgRun by saving the original stack pointer before alignment and restoring it in StgReturn. We now unconditionally advertise 64-byte stack alignment to LLVM for all x86 targets, making rewriteAVX in the LLVM Mangler unnecessary. STG_RUN_STACK_FRAME_SIZE is increased from 48 to 56 bytes on non-Windows x86-64 to store the saved stack pointer. Closes #26595 and #26822 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> - - - - - 661da815 by Teo Camarasu at 2026-03-26T03:50:33-04:00 ghc-internal: Float Generics to near top of module graph We remove GHC.Internal.Generics from the critical path of the `ghc-internal` module graph. GHC.Internal.Generics used to be in the middle of the module graph, but now it is nearer the top (built later). This change thins out the module graph and allows us to get rid of the ByteOrder hs-boot file. We implement this by moving Generics instances from the module where the datatype is defined to the GHC.Internal.Generics module. This trades off increasing the compiled size of GHC.Internal.Generics with reducing the dependency footprint of datatype modules. Not all instances are moved to GHC.Internal.Generics. For instance, `GHC.Internal.Control.Monad.Fix` keeps its instance as it is one of the very last modules compiled in `ghc-internal` and so inverting the relationship here would risk adding GHC.Internal.Generics back onto the critical path. We also don't change modules that are re-exported from the `template-haskell` or `ghc-heap`. This is done to make it easy to eventually move `Generics` to `base` once something like #26657 is implemented. Resolves #26930 Metric Decrease: T21839c - - - - - 45428f88 by sheaf at 2026-03-26T03:51:31-04:00 Avoid infinite loop in deep subsumption This commit ensures we only unify after we recur in the deep subsumption code in the FunTy vs non-FunTy case of GHC.Tc.Utils.Unify.tc_sub_type_deep, to avoid falling into an infinite loop. See the new Wrinkle [Avoiding a loop in tc_sub_type_deep] in Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify. Fixes #26823 Co-authored-by: simonpj <simon.peytonjones@gmail.com> - - - - - 2823b039 by Ian Duncan at 2026-03-26T03:52:21-04:00 AArch64: fix MOVK regUsageOfInstr to mark dst as both read and written MOVK (move with keep) modifies only a 16-bit slice of the destination register, so the destination is both read and written. The register allocator must know this to avoid clobbering live values. Update regUsageOfInstr to list the destination in both src and dst sets. No regression test: triggering the misallocation requires specific register pressure around a MOVK sequence, which is difficult to reliably provoke from Haskell source. - - - - - 57b7878d by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #12002 Closes #12002. - - - - - c8f9df2d by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #12046 Closes #12046. Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at> - - - - - 615d72ac by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #13180 Closes #13180. - - - - - 423eebcf by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #11141 Closes #11141. - - - - - 286849a4 by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #11505 Closes #11505. - - - - - 7db149d9 by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression perf test for #13820 Closes #13820. - - - - - e73c4adb by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #10381 Closes #10381. - - - - - 5ebcfb57 by Benjamin Maurer at 2026-03-26T03:54:02-04:00 Generate assembly on x86 for word2float (#22252) We used to emit C function call for MO_UF_Conv primitive. Now emits direct assembly instead. Co-Authored-By: Sylvain Henry <sylvain@haskus.fr> Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> - - - - - 5b550754 by Matthew Pickering at 2026-03-26T03:54:51-04:00 rts: forward clone-stack messages after TSO migration MSG_CLONE_STACK assumed that the target TSO was still owned by the capability that received the message. This is not always true: the TSO can migrate before the inbox entry is handled. When that happened, handleCloneStackMessage could clone a live stack from the wrong capability and use the wrong capability for allocation and performTryPutMVar, leading to stack sanity failures such as checkStackFrame: weird activation record found on stack. Fix this by passing the current capability into handleCloneStackMessage, rechecking msg->tso->cap at handling time, and forwarding the message if the TSO has migrated. Once ownership matches, use the executing capability consistently for cloneStack, rts_apply, and performTryPutMVar. Fixes #27008 - - - - - ef0a1bd2 by mangoiv at 2026-03-26T03:55:34-04:00 release tracking: adopt release tracking ticket from #16816 - - - - - a7f40fd9 by mangoiv at 2026-03-26T03:55:34-04:00 release tracking: add a release tracking ticket Brings the information in the release tracking ticket up to date with https://gitlab.haskell.org/ghc/ghc-hq/-/blob/main/release-management.mkd Resolves #26691 - - - - - 161d3285 by Teo Camarasu at 2026-03-26T03:56:18-04:00 Revert "Set default eventlog-flush-interval to 5s" Flushing the eventlog forces a synchronisation of all the capabilities and there was a worry that this might lead to a performance cost for some highly parallel workloads. This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2. - - - - - 36eed985 by Cheng Shao at 2026-03-26T03:57:03-04:00 ghc-boot: move GHC.Data.SmallArray to ghc-boot This commit moves `GHC.Data.SmallArray` from the `ghc` library to `ghc-boot`, so that it can be used by `ghci` as well: - The `Binary` (from `ghc`) instance of `SmallArray` is moved to `GHC.Utils.Binary` - Util functions `replicateSmallArrayIO`, `mapSmallArrayIO`, `mapSmallArrayM_`, `imapSmallArrayM_` , `smallArrayFromList` and `smallArrayToList` are added - The `Show` instance is added - The `Binary` (from `binary`) instance is added - - - - - fdf828ae by Cheng Shao at 2026-03-26T03:57:03-04:00 compiler: use `Binary` instance of `BCOByteArray` for bytecode objects This commit defines `Binary` (from `compiler`) instance of `BCOByteArray` which serializes the underlying buffer directly, and uses it directly in bytecode object serialization. Previously we reuse the `Binary` (from `binary`) instance, and this change allows us to avoid double-copying via an intermediate `ByteString` when using `put`/`get` in `binnary`. Also see added comment for explanation. - - - - - 3bf62d0a by Cheng Shao at 2026-03-26T03:57:03-04:00 ghci: use SmallArray directly in ResolvedBCO This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when applicable, making the memory representation more compact and reducing marshaling overhead. Closes #27058. - - - - - 3d6492ce by Wen Kokke at 2026-03-26T03:57:53-04:00 Fix race condition between flushEventLog and start/endEventLogging. This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving: - `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`. - `flushEventLog` flushes some events to `event_log_writer`. - `startEventLogging` writes the eventlog header to `event_log_writer`. This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header. This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as: ```c void flushEventLog(Capability **cap USED_IF_THREADS) { ACQUIRE_LOCK(&state_change_mutex); flushEventLog_(cap); RELEASE_LOCK(&state_change_mutex); } ``` The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable. I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours. - - - - - 7b9a75f0 by Phil Hazelden at 2026-03-26T03:58:37-04:00 Fix build with werror on glibc 2.43. We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same values as defined in glibc prior to 2.43. But in 2.43, glibc changes them to new values, which means we get a warning when redefining them. By `#undef`ing them first, we no longer get a warning. Closes #27076. - - - - - fe6e76c5 by Tobias Haslop at 2026-03-26T03:59:30-04:00 Fix broken Haddock link to Bifunctor class in description of Functor class - - - - - 404b71c1 by Luite Stegeman at 2026-03-27T04:40:49-04:00 Fix assert in Interpreter.c If we skip exactly the number of words on the stack we end up on the first word in the next chunk. - - - - - a85bd503 by Luite Stegeman at 2026-03-27T04:40:49-04:00 Support arbitrary size unboxed tuples in bytecode This stores the size (number of words on the stack) of the next expected tuple in the TSO, ctoi_spill_size field, eliminating the need of stg_ctoi_tN frames for each size. Note: On 32 bit platform there is still a bytecode tuple size limit of 255 words on the stack. Fixes #26946 - - - - - e2209031 by Luite Stegeman at 2026-03-27T04:40:49-04:00 Add specialized frames for small tuples Small tuples are now returned more efficiently to the interpreter. They use one less word of stack space and don't need manipulation of the TSO anymore. - - - - - b26bb2ea by VeryMilkyJoe at 2026-03-27T04:41:38-04:00 Remove backwards compatibility pattern synonym `ModLocation` Fixes #24932 - - - - - 66e5e324 by Vladislav Zavialov at 2026-03-27T04:42:25-04:00 Extend HsExpr with the StarIsType syntax (#26587, #26967) This patch allows kinds of the form `k -> *` and `* -> k` to occur in expression syntax, i.e. to be used as required type arguments. For example: {-# LANGUAGE RequiredTypeArguments, StarIsType #-} x1 = f (* -> * -> *) x2 = f (forall k. k -> *) x3 = f ((* -> *) -> Constraint) Summary of the changes: * Introduce the HsStar constructor of HsExpr and its extension field XStar. It is analogous to HsStarTy in HsType. * Refactor HsStarTy to store the unicode flag as TokStar, defined as type TokStar = EpUniToken "*" "★" -- similar to TokForall, TokRArrow, etc. The token is stored in the extension field and replaces the Bool field. * Extend the `infixexp2` nonterminal to parse `*` as a direct argument of `->`. This is more limited than the full StarIsType syntax, but has the nice property of not conflicting with the multiplication operator `a * b`. Test case: T26967 T26967_tyop - - - - - f8de456f by Sylvain Henry at 2026-03-27T04:43:22-04:00 STM: don't create a transaction in the rhs of catchRetry# (#26028) We don't need to create a transaction for the rhs of (catchRetry#) because contrary to the lhs we don't need to abort it on retry. Moreover it is particularly harmful if we have code such as (#26028): let cN = readTVar vN >> retry tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...)) atomically tree Because it will stack transactions for the rhss and the read-sets of all the transactions will be iteratively merged in O(n^2) after the execution of the most nested retry. This is the second attempt at implementing this. The first attempt triggered segfaults (#26291) and has been reverted. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> - - - - - fcf092dd by Luite Stegeman at 2026-03-27T04:44:17-04:00 Windows: remove StgAsyncIOResult and fix crash/leaks In stg_block_async{_void}, a stack slot was reserved for an StgAsyncIOResult. This slot would be filled by the IO manager upon completion of the async call. However, if the blocked thread was interrupted by an async exception, we would end up in an invalid state: - If the blocked computation was never re-entered, the StgAsyncIOResult would never be freed. - If the blocked computation was re-entered, the thread would find an unitialized stack slot for the StgAsyncIOResult, leading to a crash reading its fields, or freeing the pointer. We fix this by removing the StgAsyncIOResult altogether and writing the result directly to the stack. Fixes #26341 - - - - - 05094993 by Luite Stegeman at 2026-03-27T04:45:12-04:00 Don't refine DEFAULT alt for unary typeclasses A non-DEFAULT data alt for a unary typeclass dictionary would interfere with Unary Class Magic, leading to segfaults. fixes #27071 - - - - - 4ee260cf by sheaf at 2026-03-27T04:46:06-04:00 Fix several oversights in hsExprType This commit fixes several oversights in GHC.Hs.Syn.Type.hsExprType: - The 'RecordCon' case was returning the type of the constructor, instead of the constructor application. This is fixed by using 'splitFunTys'. - The 'ExplicitTuple' case failed to take into account tuple sections, and was also incorrectly handling 1-tuples (e.g. 'Solo') which can be constructed using Template Haskell. - The 'NegApp' case was returning the type of the negation operator, again failing to apply it to the argument. Fixed by using 'funResultTy'. - The 'HsProc' case was computing the result type of the arrow proc block, without taking into account the argument type. Fix that by adding a new field to 'CmdTopTc' that stores the arrow type, so that we can construct the correct result type `arr a b` for `proc (pat :: a) -> (cmd :: b)`. - The 'ArithSeq' and 'NegApp' cases were failing to take into account the result 'HsWrapper', which could e.g. silently drop casts. This is fixed by introducing 'syntaxExpr_wrappedFunResTy' which, on top of taking the result type, applies the result 'HsWrapper'. These fixes are validated by the new GHC API test T26910. Fixes #26910 - - - - - e97232ce by Hai at 2026-03-27T04:47:04-04:00 Parser.y: avoid looking at token with QualifiedDo This changes the behavior of 'hintQualifiedDo' so that the supplied token is not inspected when the QualifiedDo language extension bit is set. - - - - - 9831385b by Vladislav Zavialov at 2026-03-27T17:22:30-04:00 Infix holes in types (#11107) This patch introduces several improvements that follow naturally from refactoring HsOpTy to represent the operator as an HsType, aligning it with the approach taken by OpApp and HsExpr. User-facing changes: 1. Infix holes (t1 `_` t2) are now permitted in types, following the precedent set by term-level expressions. Test case: T11107 2. Error messages for illegal promotion ticks are now reported at more precise source locations. Test case: T17865 Internal changes: * The definition of HsOpTy now mirrors that of OpApp: | HsOpTy (XOpTy p) (LHsType p) (LHsType p) (LHsType p) | OpApp (XOpApp p) (LHsExpr p) (LHsExpr p) (LHsExpr p) This moves us one step closer to unifying HsType and HsExpr. * Ignoring locations, the old pattern match (HsOpTy x prom lhs op rhs) is now written as (HsOpTy x lhs (HsTyVar x' prom op) rhs) but we also handle (HsOpTy x lhs (HsWildCardTy x') rhs) Constructors other than HsTyVar and HsWildCardTy never appear in the operator position. * The various definitions across the compiler have been updated to work with the new representation, drawing inspiration from the term-level pipeline where appropriate. For example, ppr_infix_ty <=> ppr_infix_expr get_tyop <=> get_op lookupTypeFixityRn <=> lookupExprFixityRn (the latter is factored out from rnExpr) Test cases: T11107 T17865 - - - - - 5b6757d7 by mangoiv at 2026-03-27T17:23:19-04:00 ci: build i386 non-validate for deb12 This is a small fix that will unlock ghcup metadata to run, i386 debian 12 was missing as a job. - - - - - cf942119 by Cheng Shao at 2026-03-30T15:24:37-04:00 ghc-boot: remove unused SizedSeq instances and functions This commit removes unused `SizedSeq` instances and functions, only keeping the bits we need for hpc tick sequence for now. - - - - - 22c5b7cc by Cheng Shao at 2026-03-30T15:24:38-04:00 ghci: remove unused GHCi.BinaryArray This patch removes the unused `GHCi.BinaryArray` module from `ghci`. Closes #27108. - - - - - 77abb4ab by Cheng Shao at 2026-03-30T15:25:21-04:00 testsuite: mark T17912 as fragile on Windows T17912 is still fragile on Windows, it sometimes unexpectedly pass in CI. This especially strains our already scarce Windows CI runner resources. Mark it as fragile on Windows for the time being. - - - - - d741a6cc by Andreas Klebinger at 2026-03-31T04:39:33-04:00 Bump minimum shake version for hadrian. We also add the shake version we want to stack.yaml Fixes #26884 - - - - - 5e556f9e by Vladislav Zavialov at 2026-03-31T04:40:16-04:00 Status check for the HsType~HsExpr refactoring (#25121) Add a test case to track the status of a refactoring project within GHC whose goal is to arrive at the following declaration: type HsType = HsExpr The rationale for this is to increase code reuse between the term- and type-level code in the compiler front-end (AST, parser, renamer, type checker). The status report is saved to testsuite/tests/ghc-api/T25121_status.stdout and provides useful insights into what needs to happen to make progress on the ticket. - - - - - acffb1b1 by fendor at 2026-03-31T04:41:02-04:00 Extract Binary instances to `GHC.ByteCode.Binary` - - - - - e2ea8e25 by fendor at 2026-03-31T04:41:02-04:00 Add `seqNonEmpty` for evaluating `NonEmpty a` - - - - - 048b00b7 by fendor at 2026-03-31T04:41:02-04:00 Record `LinkableUsage` instead of `Linkable` in `LoaderState` Retaining a ByteCode `Linkable` after it has been loaded retains its `UnlinkedBCO`, keeping it alive for the remainder of the program. This starts accumulating a lot of `UnlinkedBCO` and memory over time. However, the `Linkable` is merely used to later record its usage in `mkObjectUsage`, which is used for recompilation checking. However, this is incorrect, as the interface file and bytecode objects could be in different states, e.g. the interface changes, but the bytecode library hasn't changed so we don't need to recompile and vice versa. By computing a `Fingerprint` for the `ModuleByteCode`, and recording it in the `LinkableUsage`, we know precisely whether the `ByteCode` object on disk is outdated. Thus, parts of this commit just makes sure that we efficiently compute a `Fingerprint` for `ModuleByteCode` and store it in the on-disk representation of `ModuleByteCode`. We change the `LoaderState` to retain `LinkableUsage`, which is smaller representation of a `Linkable`. This allows us to free the unneeded fields of `Linkable` after linking them. We declare the following memory invariants that this commit implements: * No `LinkablePart` should be retained from `LoaderState`. * `Linkable`s should be unloaded after they have been loaded. These invariants are unfortunately tricky to automatically uphold, so we are simply documenting our assumptions for now. We introduce the `linkable-space` test which makes sure that after loading, no `DotGBC` or `UnlinkedBCO` is retained. ------------------------- Metric Increase: MultiLayerModulesTH_OneShot ------------------------- We allocate a bit more, but the peak number of bytes doesn't change. While a bit unfortunate, accepting the metric increase. We add multiple new performance measurements where we were able to observe the desired memory invariants. Further, we add regression tests to validate that the recompilation checker behaves more correct than before. - - - - - 2d1c1997 by Simon Jakobi at 2026-03-31T04:41:46-04:00 Eliminate dictionary-passing in ListMap operations Mark the ListMap helpers 'INLINABLE' so importing modules can specialise the 'TrieMap (ListMap m)' methods and avoid recursive dictionary-passing. See Note [Making ListMap operations specialisable]. Fixes #27097 - - - - - ed2c6570 by Cheng Shao at 2026-03-31T04:42:33-04:00 testsuite: fix testdir cleanup logic on Windows testdir cleanup is unreliable on Windows (#13162) and despite existing hacks in the driver, new failure mode has occurred. This patch makes it print the warning and carry on when failed to clean up a testdir, instead of reporting a spurious framework failure. See added comment for detailed explanation. - - - - - d9388e29 by Simon Jakobi at 2026-03-31T13:14:59-04:00 Add regression test for #18177 Closes #18177. Assisted-by: Codex - - - - - 6a10045c by mangoiv at 2026-03-31T13:15:43-04:00 ci: allow metric decrease for two tests on i386 There has been a nightly failure on i386 due to a compiler runtime improvement on i386 debian 12. We allow that. Metric Decrease (test_env='i386-linux-deb12'): T12707 T8095 - - - - - 2c08b5b8 by Duncan Coutts at 2026-03-31T22:28:21+01:00 Eliminate STM_AWOKEN It was used as nullary closure for the block_info.closure in the case of a thread being awoken after an STM transaction. However, while it was written, it was never read, so contributed nothing to the behaviour. Furthermore, in the only place it was set (in tryWakeupThread) the why_blocked was immediately overwritten by the NotBlocked status, and the block_info was updated accordingly (by appendToRunQueue). So it didn't even serve a purpose of clarifying an intermediate state, there really was no such intermediate state. Cleaning this up will allow the BlockedOnSTM case to follow the same pattern as the other why_blocked cases that do not use the block_info, and in turn this reduces the number of different categories. - - - - - 32d299d9 by Duncan Coutts at 2026-03-31T22:28:21+01:00 Add a proper mapping from internal to external thread event stop codes See issue #9003 for what goes wrong when we mess this up. In that ticket, people note that we should really not require the internal tso->why_blocked codes to leak into the external eventlog thread stop codes. This change properly separates them, and explicitly maps between them using a (compact, constant) table. This table is at most 20 bytes big, and will soon shrink (and has no alignment constraints) so it seems a sensible tradeoff. This will allow us to renumber the internal why_blockd codes without breaking the eventlog output. - - - - - 305db4a4 by Duncan Coutts at 2026-03-31T22:28:21+01:00 Remove unused tso->block_info.wakeup member. Presumably it was used once, but not now. - - - - - aa38a0bb by Duncan Coutts at 2026-03-31T22:31:22+01:00 Document StgTSOBlockInfo to say what cases use what members In principle, tso->why_blocked is the tag for the StgTSOBlockInfo union, so we should be able to say for each union member the why_blocked cases that use that member. - - - - - 9be36c4a by Duncan Coutts at 2026-03-31T22:31:29+01:00 Add a tso->block_info.mvar member and use it in preference to the generic block_info.closure union member, with casts. The plan is that when we know what case we're in (via tso->why_blocked) then we can always access the correct union member, and so we will only need to access block_info.closure for generic cases where we don't know or don't care. - - - - - 770065c3 by Duncan Coutts at 2026-03-31T22:31:29+01:00 Add a tso->block_info.unused member and use it in preference to the generic block_info.closure union member, with casts. The plan is that when we know what case we're in (via tso->why_blocked) then we can always access the correct union member, and so we will only need to access block_info.closure for generic cases where we don't know or don't care. - - - - - 41a36ddf by Duncan Coutts at 2026-03-31T22:31:29+01:00 Avoid storing to tso->block_info.closure In one case we can use a specific union member (.prev) instead. In several cases the stores were in fact redundant because of subsequent overwrites. In scavengeTSO we replace setting tso->block_info.closure to a valid closure, with an assertion that the block_info.unused is already set to END_TSO_QUEUE which is a valid (static) closure. - - - - - d75bc891 by Duncan Coutts at 2026-03-31T22:31:29+01:00 Renumber the tso->why_blocked constants We can do this now because we have separated the internal values from the external ones used in the eventlog. This lets us put them back into a deliberate order and consolodate some gaps. More importantly, it is a prepation for a slightly more sophisticated encoding. - - - - - bb9936e6 by Duncan Coutts at 2026-03-31T22:31:29+01:00 Define constants for the existing stg_threadStatuszh return codes The stg_threadStatuszh reuses the internal tso->why_blocked codes but also extends them with a couple previously magic values. This is awkward since we need to know what those magic values are so we don't accidentally use those values to mean something else. By pulling a definition up to where the why_blocked codes are defined we will be able to avoid mistakenly assining those codes some meaning (or just changing the BlockedThreadComplete, BlockedThreadKilled code if necessary). - - - - - 7812defc by Duncan Coutts at 2026-03-31T22:31:29+01:00 Extend the tso->why_blocked encoding to indicate block_info closures We use some bit tricks to cheaply and generically test if a tso->why_blocked tag implies that the corresponding tso->block_info will contain a non-trivial valid closure (i.e. not just block_info.unused set to END_TSO_QUEUE). In particular we arrange for most why_blocked values to naturally have a distinguishing bit, but for the BlockedOn{Read,Write,Delay} cases, they can come in either non-closure or closure forms. We allow an additional bit to distinguish these cases. The non-closure forms are only from legacy I/O managers: select and win32-legacy. So this extra bit mechanism will be able to be retired once the legacy I/O managers are themselves retired. This means in a few places we need to untag the why_blocked value before inspecting it, but in most places we do not. - - - - - 6af497e5 by Duncan Coutts at 2026-03-31T22:31:29+01:00 Use BlockInfoForceNonClosure in the select I/O manager - - - - - b6767029 by Duncan Coutts at 2026-03-31T22:31:29+01:00 Use BlockInfoForceNonClosure in the win32-legacy I/O manager for the BlockedOn{Read,Write} since these use the non-heap allocated StgAsyncIOResult. - - - - - ee751201 by Duncan Coutts at 2026-03-31T22:31:29+01:00 Enforce the why_blocked and block_info rules in checkTSO We now check the cases wher IsBlockInfoClosure should hold, the cases that are supposed to use block_info.unused == END_TSO_QUEUE, and which cases are allowed to use BlockInfoForceNonClosure. This partially enforces the use of why_blocked as a tag for the block_info union. We could be stricter and check for the correct expected info table for the closure cases. - - - - - 9d311a69 by Duncan Coutts at 2026-03-31T22:31:29+01:00 Use IsBlockInfoClosure to simplify several tests In GC and generic traversal we need to know if we should look at the block_info.closure or not. Now we can do just that using a cheap bit test on the why_blocked tag. This fixes issue 26717, where the problem was that some GC modes did not know when to look at block_info.closure, because the poll I/O manager uses a closure for BlockedOn{Read,Write} while the select I/O manager uses a non-closure. Now this information is in the why_blocked tag itself. - - - - - 4acc9d75 by Duncan Coutts at 2026-03-31T22:32:30+01:00 Remove the now-unused scavengeTSOIOManager The GC no longer has to delegate to the I/O manager, since it can use IsBlockInfoClosure to decide things itself. - - - - - d7031829 by Duncan Coutts at 2026-03-31T22:32:36+01:00 Remove duplicate assertion - - - - - d6bf2eb0 by Duncan Coutts at 2026-03-31T22:37:24+01:00 Follow atomic access rules more consistently for tso->why_blocked The rule is this: store block_info *before* why_blocked store why_blocked using store release load why_blocked using load acquire load block_info *after* why_blocked This is a an atomic store release / load acquire pair and (if the reads are in a separate thread to the writes, and the read receives the value stored) then this guarantees a full "happens before" relationship of these stores and loads. In some cases, we do not need a full load acquire, because we don't read the block_info at all and so do not need any ordering. In this case we just need an atomic relaxed load. This was being followed in most places, but not all. If there's good reason in any case that we don't need atomic access, then we should document that in a comment. In the absence of that I think it's easier to follow the rule everywhere. - - - - - d098ecbe by Duncan Coutts at 2026-03-31T22:37:30+01:00 FIXUP for Use BlockInfoForceNonClosure in the select I/O manager - - - - - 1214 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/generate-ci/flake.lock - .gitlab/generate-ci/gen_ci.hs - + .gitlab/issue_templates/release_tracking.md - .gitlab/jobs.yaml - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - compiler/CodeGen.Platform.h - compiler/GHC.hs - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/Utils.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/Asm.hs - + compiler/GHC/ByteCode/Binary.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Linker.hs - + compiler/GHC/ByteCode/Recomp/Binary.hs - compiler/GHC/ByteCode/Serialize.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/Cmm/Expr.hs - compiler/GHC/Cmm/MachOp.hs - compiler/GHC/Cmm/Node.hs - compiler/GHC/Cmm/Opt.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/Cmm/Type.hs - compiler/GHC/Cmm/Utils.hs - compiler/GHC/CmmToAsm/AArch64/CodeGen.hs - compiler/GHC/CmmToAsm/AArch64/Instr.hs - compiler/GHC/CmmToAsm/AArch64/Ppr.hs - compiler/GHC/CmmToAsm/AArch64/Regs.hs - compiler/GHC/CmmToAsm/Config.hs - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/LA64/Ppr.hs - compiler/GHC/CmmToAsm/LA64/Regs.hs - compiler/GHC/CmmToAsm/PPC/CodeGen.hs - compiler/GHC/CmmToAsm/PPC/Ppr.hs - compiler/GHC/CmmToAsm/PPC/Regs.hs - compiler/GHC/CmmToAsm/RV64/CodeGen.hs - compiler/GHC/CmmToAsm/RV64/Ppr.hs - compiler/GHC/CmmToAsm/RV64/Regs.hs - compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs - compiler/GHC/CmmToAsm/Wasm/FromCmm.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/CmmToAsm/X86/Regs.hs - compiler/GHC/CmmToC.hs - compiler/GHC/CmmToLlvm.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/CmmToLlvm/Config.hs - compiler/GHC/CmmToLlvm/Data.hs - compiler/GHC/CmmToLlvm/Mangler.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/FloatIn.hs - compiler/GHC/Core/Opt/FloatOut.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/Pipeline.hs - + compiler/GHC/Core/Opt/Range.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/WorkWrap.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToStg/AddImplicitBinds.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Data/TrieMap.hs - compiler/GHC/Driver/Config/CmmToAsm.hs - compiler/GHC/Driver/Config/CmmToLlvm.hs - compiler/GHC/Driver/Config/Core/Lint.hs - compiler/GHC/Driver/Config/Interpreter.hs - compiler/GHC/Driver/Config/StgToCmm.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Hooks.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Plugins.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/Hs/Lit.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Syn/Type.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Arrows.hs - compiler/GHC/HsToCore/Docs.hs - compiler/GHC/HsToCore/Errors/Ppr.hs - compiler/GHC/HsToCore/Errors/Types.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/GuardedRHSs.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - 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libraries/base/src/GHC/Exts.hs - libraries/base/src/GHC/Fingerprint.hs - libraries/base/src/GHC/ResponseFile.hs - libraries/base/src/GHC/Stats.hs - libraries/base/src/GHC/Unicode.hs - libraries/base/src/GHC/Weak.hs - libraries/base/src/GHC/Weak/Finalize.hs - libraries/base/src/Prelude.hs - libraries/base/src/System/Exit.hs - libraries/base/src/System/IO.hs - libraries/base/src/System/IO/OS.hs - libraries/base/src/System/Info.hs - libraries/base/src/System/Mem/Weak.hs - libraries/base/tests/IO/T17912.hs - libraries/base/tests/IO/T18832.hs - libraries/base/tests/IO/all.T - libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs - libraries/ghc-boot/GHC/Data/SizedSeq.hs - compiler/GHC/Data/SmallArray.hs → libraries/ghc-boot/GHC/Data/SmallArray.hs - libraries/ghc-boot/ghc-boot.cabal.in - libraries/ghc-experimental/CHANGELOG.md - libraries/ghc-experimental/ghc-experimental.cabal.in - libraries/ghc-experimental/src/GHC/Profiling/Eras.hs - libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs - + libraries/ghc-experimental/src/GHC/Stack/Decode/Experimental.hs - + libraries/ghc-experimental/tests/Makefile - libraries/base/src/GHC/Weak/Finalizehs → libraries/ghc-experimental/tests/all.T - + libraries/ghc-experimental/tests/backtraces/Makefile - + libraries/ghc-experimental/tests/backtraces/T26806a.hs - + libraries/ghc-experimental/tests/backtraces/T26806a.stderr - + libraries/ghc-experimental/tests/backtraces/T26806b.hs - + libraries/ghc-experimental/tests/backtraces/T26806b.stderr - + libraries/ghc-experimental/tests/backtraces/T26806c.hs - + libraries/ghc-experimental/tests/backtraces/T26806c.stderr - + libraries/ghc-experimental/tests/backtraces/all.T - libraries/ghc-heap/GHC/Exts/Heap/Closures.hs - libraries/ghc-internal/CHANGELOG.md - libraries/ghc-internal/cbits/Stack.cmm - libraries/ghc-internal/codepages/MakeTable.hs - libraries/ghc-internal/ghc-internal.cabal.in - libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs - libraries/ghc-internal/src/GHC/Internal/Arr.hs - 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