September 2025 - ghc-commits

[Git][ghc/ghc][wip/T23162-spj] Wibbles [skip ci]
by Simon Peyton Jones (＠simonpj) 15 Sep '25

15 Sep '25

Simon Peyton Jones pushed to branch wip/T23162-spj at Glasgow Haskell Compiler / GHC Commits: 142ce546 by Simon Peyton Jones at 2025-09-15T17:48:11+01:00 Wibbles [skip ci] - - - - - 1 changed file: - compiler/GHC/Tc/Solver/FunDeps.hs Changes: ===================================== compiler/GHC/Tc/Solver/FunDeps.hs ===================================== @@ -438,7 +438,7 @@ tryEqFunDeps :: EqCt -> SolverStage () tryEqFunDeps work_item@(EqCt { eq_lhs = lhs, eq_eq_rel = eq_rel }) | NomEq <- eq_rel , TyFamLHS tc args <- lhs - = tryFamEqFunDeps tc args work_item + = tryFamEqFunDeps tc args work_item -- We have F args ~ rhs | otherwise = nopStage () @@ -455,7 +455,6 @@ tryFamEqFunDeps fam_tc args work_item@(EqCt { eq_ev = ev, eq_rhs = rhs }) mkTopBuiltinFamEqFDs fam_tc ops args rhs } | Injective inj_flags <- tyConInjectivityInfo fam_tc - , isWanted ev = if isGiven ev then nopStage () -- See (INJFAM:Given) else do { -- Note [Do local fundeps before top-level instances] @@ -776,8 +775,8 @@ solveFunDeps work_ev fd_eqns nestFunDepsTcS $ do { (_, eqs) <- wrapUnifier work_ev Nominal do_fundeps ; solveSimpleWanteds eqs } - -- ToDo: why solveSimpleWanteds? Answer - -- (a) don't rely on eager unifier + -- Why solveSimpleWanteds? Answer + -- (a) We don't want to rely on the eager unifier being clever -- (b) F Int alpha ~ Maybe Int where type instance F Int x = Maybe x ; return unif_happened } View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/142ce546b055d9322437167f957aac8… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/142ce546b055d9322437167f957aac8… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FIXED] TestCompilerArgs: Fix arch (out of tree)
by Sven Tennie (＠supersven) 15 Sep '25

15 Sep '25

Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FIXED at Glasgow Haskell Compiler / GHC Commits: 423a7433 by Sven Tennie at 2025-09-15T16:39:58+00:00 TestCompilerArgs: Fix arch (out of tree) - - - - - 1 changed file: - hadrian/src/Settings/Builders/RunTest.hs Changes: ===================================== hadrian/src/Settings/Builders/RunTest.hs ===================================== @@ -22,8 +22,6 @@ import Settings.Program (programContext) import qualified Context.Type import GHC.Toolchain.Target -import Text.Read -import GHC.Platform.ArchOS import Debug.Trace @@ -166,11 +164,8 @@ outOfTreeCompilerArgs = do debugAssertions <- getBooleanSetting TestGhcDebugAssertions - let readArch :: String -> Maybe Arch - readArch = readMaybe - os <- getTestSetting TestHostOS - arch <- maybe "unknown" stringEncodeArch . readArch <$> getTestSetting TestTargetARCH + arch <- getTestSetting TestTargetARCH platform <- getTestSetting TestTARGETPLATFORM wordsize <- show . read @Int <$> getTestSetting TestWORDSIZE rtsWay <- getTestSetting TestRTSWay View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/423a7433560161d700c23704e8f366a… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/423a7433560161d700c23704e8f366a… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FIXED] TestCompilerArgs: Fix arch (out of tree)
by Sven Tennie (＠supersven) 15 Sep '25

15 Sep '25

Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FIXED at Glasgow Haskell Compiler / GHC Commits: 5eb311eb by Sven Tennie at 2025-09-15T16:10:53+00:00 TestCompilerArgs: Fix arch (out of tree) - - - - - 1 changed file: - hadrian/src/Settings/Builders/RunTest.hs Changes: ===================================== hadrian/src/Settings/Builders/RunTest.hs ===================================== @@ -166,11 +166,8 @@ outOfTreeCompilerArgs = do debugAssertions <- getBooleanSetting TestGhcDebugAssertions - let readArch :: String -> Maybe Arch - readArch = readMaybe - os <- getTestSetting TestHostOS - arch <- maybe "unknown" stringEncodeArch . readArch <$> getTestSetting TestTargetARCH + arch <- getTestSetting TestTargetARCH platform <- getTestSetting TestTARGETPLATFORM wordsize <- show . read @Int <$> getTestSetting TestWORDSIZE rtsWay <- getTestSetting TestRTSWay View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5eb311eb21a48f9ad482fc07748bef0… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5eb311eb21a48f9ad482fc07748bef0… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Pushed new branch wip/backports-9.14
by Ben Gamari (＠bgamari) 15 Sep '25

15 Sep '25

Ben Gamari pushed new branch wip/backports-9.14 at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/backports-9.14 You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FIXED] TestCompilerArgs: Fix arch (out of tree)
by Sven Tennie (＠supersven) 15 Sep '25

15 Sep '25

Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FIXED at Glasgow Haskell Compiler / GHC Commits: f9ae4342 by Sven Tennie at 2025-09-15T13:12:32+00:00 TestCompilerArgs: Fix arch (out of tree) - - - - - 1 changed file: - hadrian/src/Settings/Builders/RunTest.hs Changes: ===================================== hadrian/src/Settings/Builders/RunTest.hs ===================================== @@ -170,7 +170,7 @@ outOfTreeCompilerArgs = do readArch = readMaybe os <- getTestSetting TestHostOS - arch <- maybe "unknown" stringEncodeArch . readArch <$> getTestSetting TestTargetARCH + arch <- getTestSetting TestTargetARCH platform <- getTestSetting TestTARGETPLATFORM wordsize <- show . read @Int <$> getTestSetting TestWORDSIZE rtsWay <- getTestSetting TestRTSWay View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f9ae4342ccf1004e87946951e97e9b1… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f9ae4342ccf1004e87946951e97e9b1… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Pushed new branch wip/tdammers/outsource-testsuite-driver
by Tobias Dammers (＠tdammers) 15 Sep '25

15 Sep '25

Tobias Dammers pushed new branch wip/tdammers/outsource-testsuite-driver at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/tdammers/outsource-testsuite-… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FIXED] Fix out-of-tree TestCompilerArgs parsing: WORDSIZE
by Sven Tennie (＠supersven) 15 Sep '25

15 Sep '25

Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FIXED at Glasgow Haskell Compiler / GHC Commits: d3c7db03 by Sven Tennie at 2025-09-15T12:25:59+00:00 Fix out-of-tree TestCompilerArgs parsing: WORDSIZE TestWORDSIZE is in bits, not bytes. - - - - - 1 changed file: - hadrian/src/Settings/Builders/RunTest.hs Changes: ===================================== hadrian/src/Settings/Builders/RunTest.hs ===================================== @@ -172,7 +172,7 @@ outOfTreeCompilerArgs = do os <- getTestSetting TestHostOS arch <- maybe "unknown" stringEncodeArch . readArch <$> getTestSetting TestTargetARCH platform <- getTestSetting TestTARGETPLATFORM - wordsize <- show . ((8 :: Int) *) . read <$> getTestSetting TestWORDSIZE + wordsize <- show . read @Int <$> getTestSetting TestWORDSIZE rtsWay <- getTestSetting TestRTSWay let debugged = "debug" `isInfixOf` rtsWay View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d3c7db03b121ce0612c8fc6e479a8de… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d3c7db03b121ce0612c8fc6e479a8de… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/supersven/fix-foundation-test-shift-amounts] 89 commits: compiler: use zero cost coerce in hoopl setElems/mapToList
by Sven Tennie (＠supersven) 15 Sep '25

15 Sep '25

Sven Tennie pushed to branch wip/supersven/fix-foundation-test-shift-amounts at Glasgow Haskell Compiler / GHC Commits: bedc1004 by Cheng Shao at 2025-08-26T09:31:18-04:00 compiler: use zero cost coerce in hoopl setElems/mapToList This patch is a follow-up of !14680 and changes setElems/mapToList in GHC/Cmm/Dataflow/Label to use coerce instead of mapping mkHooplLabel over the keys. - - - - - 13250d97 by Ryan Scott at 2025-08-26T09:31:59-04:00 Reject infix promoted data constructors without DataKinds In the rename, make sure to apply the same `DataKinds` checks for both `HsTyVar` (for prefix promoted data constructors) and `HsOpTy` (for infix promoted data constructors) alike. Fixes #26318. - - - - - 37655c46 by Teo Camarasu at 2025-08-26T15:24:51-04:00 tests: disable T22859 under LLVM This test was failing under the LLVM backend since the allocations differ from the NCG. Resolves #26282 - - - - - 2cbba9d6 by Teo Camarasu at 2025-08-26T15:25:33-04:00 base-exports: update version numbers As the version of the compiler has been bumped, a lot of the embedded version numbers will need to be updated if we ever run this test with `--test-accept` so let's just update them now, and keep future diffs clean. - - - - - f9f2ffcf by Alexandre Esteves at 2025-08-27T07:19:14-04:00 Import new name for 'utimbuf' on windows to fix #26337 Fixes an `-Wincompatible-pointer-types` instance that turns into an error on recent toolchains and surfaced as such on nixpkgs when doing linux->ucrt cross. This long-standing warning has been present at least since 9.4: ``` C:\GitLabRunner\builds\0\1709189\tmp\ghc16652_0\ghc_4.c:26:115: error: warning: incompatible pointer types passing 'struct utimbuf *' to parameter of type 'struct _utimbuf *' [-Wincompatible-pointer-types] | 26 | HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);} | ^ HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);} ^~ C:\GitLabRunner\builds\0\1709189\_build\stage0\lib\..\..\mingw\x86_64-w64-mingw32\include\sys\utime.h:109:72: error: note: passing argument to parameter '_Utimbuf' here | 109 | __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) { | ^ __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) { ``` - - - - - ae89f000 by Hassan Al-Awwadi at 2025-08-27T07:19:56-04:00 Adds the fucnction addDependentDirectory to Q, resolving issue #26148. This function adds a new directory to the list of things a module depends upon. That means that when the contents of the directory change, the recompilation checker will notice this and the module will be recompiled. Documentation has also been added for addDependentFunction and addDependentDirectory in the user guide. - - - - - 00478944 by Simon Peyton Jones at 2025-08-27T16:48:30+01:00 Comments only - - - - - a7884589 by Simon Peyton Jones at 2025-08-28T11:08:23+01:00 Type-family occurs check in unification The occurs check in `GHC.Core.Unify.uVarOrFam` was inadequate in dealing with type families. Better now. See Note [The occurs check in the Core unifier]. As I did this I realised that the whole apartness thing is trickier than I thought: see the new Note [Shortcomings of the apartness test] - - - - - 8adfc222 by sheaf at 2025-08-28T19:47:17-04:00 Fix orientation in HsWrapper composition (<.>) This commit fixes the order in which WpCast HsWrappers are composed, fixing a bug introduced in commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1. Fixes #26350 - - - - - eb2ab1e2 by Oleg Grenrus at 2025-08-29T11:00:53-04:00 Generalise thNameToGhcName by adding HasHscEnv There were multiple single monad-specific `getHscEnv` across codebase. HasHscEnv is modelled on HasDynFlags. My first idea was to simply add thNameToGhcNameHsc and thNameToGhcNameTc, but those would been exactly the same as thNameToGhcName already. Also add an usage example to thNameToGhcName and mention that it's recommended way of looking up names in GHC plugins - - - - - 2d575a7f by fendor at 2025-08-29T11:01:36-04:00 configure: Bump minimal bootstrap GHC version to 9.10 - - - - - 716274a5 by Simon Peyton Jones at 2025-08-29T17:27:12-04:00 Fix deep subsumption again This commit fixed #26255: commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1 Author: sheaf <sam.derbyshire(a)gmail.com> Date: Mon Aug 11 15:50:47 2025 +0200 Improve deep subsumption This commit improves the DeepSubsumption sub-typing implementation in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back to unification. But alas it still wasn't quite right for view patterns: #26331 This MR does a generalisation to fix it. A bit of a sledgehammer to crack a nut, but nice. * Add a field `ir_inst :: InferInstFlag` to `InferResult`, where ``` data InferInstFlag = IIF_Sigma | IIF_ShallowRho | IIF_DeepRho ``` * The flag says exactly how much `fillInferResult` should instantiate before filling the hole. * We can also use this to replace the previous very ad-hoc `tcInferSigma` that was used to implement GHCi's `:type` command. - - - - - 27206c5e by sheaf at 2025-08-29T17:28:14-04:00 Back-compat for TH SpecialiseP data-con of Pragma This commit improves the backwards-compatibility story for the SpecialiseP constructor of the Template Haskell 'Pragma' datatype. Instead of keeping the constructor but deprecating it, this commit makes it into a bundled pattern synonym of the Pragma datatype. We no longer deprecate it; it's useful for handling old-form specialise pragmas. - - - - - 26dbcf61 by fendor at 2025-08-30T05:10:08-04:00 Move stack decoding logic from ghc-heap to ghc-internal The stack decoding logic in `ghc-heap` is more sophisticated than the one currently employed in `CloneStack`. We want to use the stack decoding implementation from `ghc-heap` in `base`. We cannot simply depend on `ghc-heap` in `base` due do bootstrapping issues. Thus, we move the code that is necessary to implement stack decoding to `ghc-internal`. This is the right location, as we don't want to add a new API to `base`. Moving the stack decoding logic and re-exposing it in ghc-heap is insufficient, though, as we have a dependency cycle between. * ghc-heap depends on stage1:ghc-internal * stage0:ghc depends on stage0:ghc-heap To fix this, we remove ghc-heap from the set of `stage0` dependencies. This is not entirely straight-forward, as a couple of boot dependencies, such as `ghci` depend on `ghc-heap`. Luckily, the boot compiler of GHC is now >=9.10, so we can migrate `ghci` to use `ghc-internal` instead of `ghc-heap`, which already exports the relevant modules. However, we cannot 100% remove ghc's dependency on `ghc-heap`, since when we compile `stage0:ghc`, `stage1:ghc-internal` is not yet available. Thus, when we compile with the boot-compiler, we still depend on an older version of `ghc-heap`, and only use the modules from `ghc-internal`, if the `ghc-internal` version is recent enough. ------------------------- Metric Increase: T24602_perf_size T25046_perf_size_gzip T25046_perf_size_unicode T25046_perf_size_unicode_gzip size_hello_artifact size_hello_artifact_gzip size_hello_unicode size_hello_unicode_gzip ------------------------- These metric increases are unfortunate, they are most likely caused by the larger (literally in terms of lines of code) stack decoder implementation that are now linked into hello-word binaries. On linux, it is almost a 10% increase, which is considerable. - - - - - bd80bb70 by fendor at 2025-08-30T05:10:08-04:00 Implement `decode` in terms of `decodeStackWithIpe` Uses the more efficient stack decoder implementation. - - - - - 24441165 by fendor at 2025-08-30T05:10:08-04:00 Remove stg_decodeStackzh - - - - - fb9cc882 by Simon Peyton Jones at 2025-08-30T05:10:51-04:00 Fix a long standing bug in the coercion optimiser We were mis-optimising ForAllCo, leading to #26345 Part of the poblem was the tricky tower of abstractions leading to the dreadful GHC.Core.TyCo.Subst.substForAllCoTyVarBndrUsing This function was serving two masters: regular substitution, but also coercion optimsation. So tricky was it that it did so wrong. In this MR I locate all the fancy footwork for coercion optimisation in GHC.Core.Coercion.Opt, where it belongs. That leaves substitution free to be much simpler. - - - - - 6c78de2d by Sylvain Henry at 2025-09-01T08:46:19-04:00 Driver: substitute virtual Prim module in --make mode too When we build ghc-internal with --make (e.g. with cabal-install), we need to be careful to substitute the virtual interface file for GHC.Internal.Prim: - after code generation (we generate code for an empty module, so we get an empty interface) - when we try to reload its .hi file - - - - - 26e0db16 by fendor at 2025-09-01T08:47:01-04:00 Expose Stack Annotation frames in IPE backtraces by default When decoding the Haskell-native call stack and displaying the IPE information for the stack frames, we print the `StackAnnotation` of the `AnnFrame` by default. This means, when an exception is thrown, any intermediate stack annotations will be displayed in the `IPE Backtrace`. Example backtrace: ``` Exception: ghc-internal:GHC.Internal.Exception.ErrorCall: Oh no! IPE backtrace: annotateCallStackIO, called at app/Main.hs:48:10 in backtrace-0.1.0.0-inplace-server:Main annotateCallStackIO, called at app/Main.hs:46:13 in backtrace-0.1.0.0-inplace-server:Main Main.handler (app/Main.hs:(46,1)-(49,30)) Main.liftIO (src/Servant/Server/Internal/Handler.hs:30:36-42) Servant.Server.Internal.Delayed.runHandler' (src/Servant/Server/Internal/Handler.hs:27:31-41) Control.Monad.Trans.Resource.runResourceT (./Control/Monad/Trans/Resource.hs:(192,14)-(197,18)) Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:195:20-22) Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:(195,5)-(203,31)) Network.Wai.Handler.Warp.HTTP1.http1server.loop (./Network/Wai/Handler/Warp/HTTP1.hs:(141,9)-(157,42)) HasCallStack backtrace: error, called at app/Main.hs:48:32 in backtrace-0.1.0.0-inplace-server:Main ``` The first two entries have been added by `annotateCallStackIO`, defined in `annotateCallStackIO`. - - - - - a1567efd by Sylvain Henry at 2025-09-01T23:01:35-04:00 RTS: rely less on Hadrian for flag setting (#25843) Hadrian used to pass -Dfoo command-line flags directly to build the rts. We can replace most of these flags with CPP based on cabal flags. It makes building boot libraries with cabal-install simpler (cf #25843). - - - - - ca5b0283 by Sergey Vinokurov at 2025-09-01T23:02:23-04:00 Remove unnecessary irrefutable patterns from Bifunctor instances for tuples Implementation of https://github.com/haskell/core-libraries-committee/issues/339 Metric Decrease: mhu-perf - - - - - 2da84b7a by sheaf at 2025-09-01T23:03:23-04:00 Only use active rules when simplifying rule RHSs When we are simplifying the RHS of a rule, we make sure to only apply rewrites from rules that are active throughout the original rule's range of active phases. For example, if a rule is always active, we only fire rules that are themselves always active when simplifying the RHS. Ditto for inline activations. This is achieved by setting the simplifier phase to a range of phases, using the new SimplPhaseRange constructor. Then: 1. When simplifying the RHS of a rule, or of a stable unfolding, we set the simplifier phase to a range of phases, computed from the activation of the RULE/unfolding activation, using the function 'phaseFromActivation'. The details are explained in Note [What is active in the RHS of a RULE?] in GHC.Core.Opt.Simplify.Utils. 2. The activation check for other rules and inlinings is then: does the activation of the other rule/inlining cover the whole phase range set in sm_phase? This continues to use the 'isActive' function, which now accounts for phase ranges. On the way, this commit also moves the exact-print SourceText annotation from the Activation datatype to the ActivationAnn type. This keeps the main Activation datatype free of any extra cruft. Fixes #26323 - - - - - 79816cc4 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 cleanup: Move dehydrateCgBreakInfo to Stg2Bc This no longer has anything to do with Core. - - - - - 53da94ff by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 rts/Disassembler: Fix spacing of BRK_FUN - - - - - 08c0cf85 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 debugger: Fix bciPtr in Step-out We need to use `BCO_NEXT` to move bciPtr to ix=1, because ix=0 points to the instruction itself! I do not understand how this didn't crash before. - - - - - e7e021fa by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 debugger: Allow BRK_FUNs to head case continuation BCOs When we start executing a BCO, we may want to yield to the scheduler: this may be triggered by a heap/stack check, context switch, or a breakpoint. To yield, we need to put the stack in a state such that when execution is resumed we are back to where we yielded from. Previously, a BKR_FUN could only head a function BCO because we only knew how to construct a valid stack for yielding from one -- simply add `apply_interp_info` + the BCO to resume executing. This is valid because the stack at the start of run_BCO is headed by that BCO's arguments. However, in case continuation BCOs (as per Note [Case continuation BCOs]), we couldn't easily reconstruct a valid stack that could be resumed because we dropped too soon the stack frames regarding the value returned (stg_ret) and received (stg_ctoi) by that continuation. This is especially tricky because of the variable type and size return frames (e.g. pointer ret_p/ctoi_R1p vs a tuple ret_t/ctoi_t2). The trick to being able to yield from a BRK_FUN at the start of a case cont BCO is to stop removing the ret frame headers eagerly and instead keep them until the BCO starts executing. The new layout at the start of a case cont. BCO is described by the new Note [Stack layout when entering run_BCO]. Now, we keep the ret_* and ctoi_* frames when entering run_BCO. A BRK_FUN is then executed if found, and the stack is yielded as-is with the preserved ret and ctoi frames. Then, a case cont BCO's instructions always SLIDE off the headers of the ret and ctoi frames, in StgToByteCode.doCase, turning a stack like | .... | +---------------+ | fv2 | +---------------+ | fv1 | +---------------+ | BCO | +---------------+ | stg_ctoi_ret_ | +---------------+ | retval | +---------------+ | stg_ret_..... | +---------------+ into | .... | +---------------+ | fv2 | +---------------+ | fv1 | +---------------+ | retval | +---------------+ for the remainder of the BCO. Moreover, this more uniform approach of keeping the ret and ctoi frames means we need less ad-hoc logic concerning the variable size of ret_tuple vs ret_p/np frames in the code generator and interpreter: Always keep the return to cont. stack intact at the start of run_BCO, and the statically generated instructions will take care of adjusting it. Unlocks BRK_FUNs at the start of case cont. BCOs which will enable a better user-facing step-out (#26042) which is free of the bugs the current BRK_ALTS implementation suffers from (namely, using BRK_FUN rather than BRK_ALTS in a case cont. means we'll never accidentally end up in a breakpoint "deeper" than the continuation, because we stop at the case cont itself rather than on the first breakpoint we evaluate after it). - - - - - ade3c1e6 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 BRK_FUN with InternalBreakLocs for code-generation time breakpoints At the start of a case continuation BCO, place a BRK_FUN. This BRK_FUN uses the new "internal breakpoint location" -- allowing us to come up with a valid source location for this breakpoint that is not associated with a source-level tick. For case continuation BCOs, we use the last tick seen before it as the source location. The reasoning is described in Note [Debugger: Stepout internal break locs]. Note how T26042c, which was broken because it displayed the incorrect behavior of the previous step out when we'd end up at a deeper level than the one from which we initiated step-out, is now fixed. As of this commit, BRK_ALTS is now dead code and is thus dropped. Note [Debugger: Stepout internal break locs] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Step-out tells the interpreter to run until the current function returns to where it was called from, and stop there. This is achieved by enabling the BRK_FUN found on the first RET_BCO frame on the stack (See [Note Debugger: Step-out]). Case continuation BCOs (which select an alternative branch) must therefore be headed by a BRK_FUN. An example: f x = case g x of <--- end up here 1 -> ... 2 -> ... g y = ... <--- step out from here - `g` will return a value to the case continuation BCO in `f` - The case continuation BCO will receive the value returned from g - Match on it and push the alternative continuation for that branch - And then enter that alternative. If we step-out of `g`, the first RET_BCO on the stack is the case continuation of `f` -- execution should stop at its start, before selecting an alternative. (One might ask, "why not enable the breakpoint in the alternative instead?", because the alternative continuation is only pushed to the stack *after* it is selected by the case cont. BCO) However, the case cont. BCO is not associated with any source-level tick, it is merely the glue code which selects alternatives which do have source level ticks. Therefore, we have to come up at code generation time with a breakpoint location ('InternalBreakLoc') to display to the user when it is stopped there. Our solution is to use the last tick seen just before reaching the case continuation. This is robust because a case continuation will thus always have a relevant breakpoint location: - The source location will be the last source-relevant expression executed before the continuation is pushed - So the source location will point to the thing you've just stepped out of - Doing :step-local from there will put you on the selected alternative (which at the source level may also be the e.g. next line in a do-block) Examples, using angle brackets (<<...>>) to denote the breakpoint span: f x = case <<g x>> {- step in here -} of 1 -> ... 2 -> ...> g y = <<...>> <--- step out from here ... f x = <<case g x of <--- end up here, whole case highlighted 1 -> ... 2 -> ...>> doing :step-local ... f x = case g x of 1 -> <<...>> <--- stop in the alternative 2 -> ... A second example based on T26042d2, where the source is a do-block IO action, optimised to a chain of `case expressions`. main = do putStrLn "hello1" <<f>> <--- step-in here putStrLn "hello3" putStrLn "hello4" f = do <<putStrLn "hello2.1">> <--- step-out from here putStrLn "hello2.2" ... main = do putStrLn "hello1" <<f>> <--- end up here again, the previously executed expression putStrLn "hello3" putStrLn "hello4" doing step/step-local ... main = do putStrLn "hello1" f <<putStrLn "hello3">> <--- straight to the next line putStrLn "hello4" Finishes #26042 - - - - - c66910c0 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 debugger: Re-use the last BreakpointId whole in step-out Previously, to come up with a location to stop at for `:stepout`, we would store the location of the last BreakpointId surrounding the continuation, as described by Note [Debugger: Stepout internal break locs]. However, re-using just the location from the last source breakpoint isn't sufficient to provide the necessary information in the break location. Specifically, it wouldn't bind any variables at that location. Really, there is no reason not to re-use the last breakpoint wholesale, and re-use all the information we had there. Step-out should behave just as if we had stopped at the call, but s.t. continuing will not re-execute the call. This commit updates the CgBreakInfo to always store a BreakpointId, be it the original one or the one we're emulating (for step-out). It makes variable bindings on :stepout work - - - - - e4abed7b by sheaf at 2025-09-02T12:20:40-04:00 Revert accidental changes to hie.yaml - - - - - 003b715b by meooow25 at 2025-09-02T23:48:51+02:00 Adjust the strictness of Data.List.iterate' * Don't force the next element in advance when generating a (:). * Force the first element to WHNF like every other element. Now every element in the output list is forced to WHNF when the (:) containing it is forced. CLC proposal: https://github.com/haskell/core-libraries-committee/issues/335 - - - - - b2f6aad0 by Simon Hengel at 2025-09-03T04:36:10-04:00 Refactoring: More consistently use logOutput, logInfo, fatalErrorMsg - - - - - 60a16db7 by Rodrigo Mesquita at 2025-09-03T10:55:50+01:00 bytecode: Don't PUSH_L 0; SLIDE 1 1 While looking through bytecode I noticed a quite common unfortunate pattern: ... PUSH_L 0 SLIDE 1 1 We do this often by generically constructing a tail call from a function atom that may be somewhere arbitrary on the stack. However, for the special case that the function can be found directly on top of the stack, as part of the arguments, it's plain redundant to push then slide it. In this commit we add a small optimisation to the generation of tailcalls in bytecode. Simply: lookahead for the function in the stack. If it is the first thing on the stack and it is part of the arguments which would be dropped as we entered the tail call, then don't push then slide it. In a simple example (T26042b), this already produced a drastic improvement in generated code (left is old, right is with this patch): ```diff 3c3 < 2025-07-29 10:14:02.081277 UTC --- > 2025-07-29 10:50:36.560949 UTC 160,161c160 < PUSH_L 0 < SLIDE 1 2 --- > SLIDE 1 1 164,165d162 < PUSH_L 0 < SLIDE 1 1 175,176c172 < PUSH_L 0 < SLIDE 1 2 --- > SLIDE 1 1 179,180d174 < PUSH_L 0 < SLIDE 1 1 206,207d199 < PUSH_L 0 < SLIDE 1 1 210,211d201 < PUSH_L 0 < SLIDE 1 1 214,215d203 < PUSH_L 0 < SLIDE 1 1 218,219d205 < PUSH_L 0 < SLIDE 1 1 222,223d207 < PUSH_L 0 < SLIDE 1 1 ... 600,601c566 < PUSH_L 0 < SLIDE 1 2 --- > SLIDE 1 1 604,605d568 < PUSH_L 0 < SLIDE 1 1 632,633d594 < PUSH_L 0 < SLIDE 1 1 636,637d596 < PUSH_L 0 < SLIDE 1 1 640,641d598 < PUSH_L 0 < SLIDE 1 1 644,645d600 < PUSH_L 0 < SLIDE 1 1 648,649d602 < PUSH_L 0 < SLIDE 1 1 652,653d604 < PUSH_L 0 < SLIDE 1 1 656,657d606 < PUSH_L 0 < SLIDE 1 1 660,661d608 < PUSH_L 0 < SLIDE 1 1 664,665d610 < PUSH_L 0 < SLIDE 1 1 ``` I also compiled lib:Cabal to bytecode and counted the number of bytecode lines with `find dist-newstyle -name "*.dump-BCOs" -exec wc {} +`: with unoptimized core: 1190689 lines (before) - 1172891 lines (now) = 17798 less redundant instructions (-1.5% lines) with optimized core: 1924818 lines (before) - 1864836 lines (now) = 59982 less redundant instructions (-3.1% lines) - - - - - 8b2c72c0 by L0neGamer at 2025-09-04T06:32:03-04:00 Add Control.Monad.thenM and Control.Applicative.thenA - - - - - 39e1b7cb by Teo Camarasu at 2025-09-04T06:32:46-04:00 ghc-internal: invert dependency of GHC.Internal.TH.Syntax on Data.Data This means that Data.Data no longer blocks building TH.Syntax, which allows greater parallelism in our builds. We move the Data.Data.Data instances to Data.Data. Quasi depends on Data.Data for one of its methods, so, we split the Quasi/Q, etc definition out of GHC.Internal.TH.Syntax into its own module. This has the added benefit of splitting up this quite large module. Previously TH.Syntax was a bottleneck when compiling ghc-internal. Now it is less of a bottle-neck and is also slightly quicker to compile (since it no longer contains these instances) at the cost of making Data.Data slightly more expensive to compile. TH.Lift which depends on TH.Syntax can also compile quicker and no longer blocks ghc-internal finishing to compile. Resolves #26217 ------------------------- Metric Decrease: MultiLayerModulesTH_OneShot T13253 T21839c T24471 Metric Increase: T12227 ------------------------- - - - - - bdf82fd2 by Teo Camarasu at 2025-09-04T06:32:46-04:00 compiler: delete unused names in Builtins.Names.TH returnQ and bindQ are no longer used in the compiler. There was also a very old comment that referred to them that I have modernized - - - - - 41a448e5 by Ben Gamari at 2025-09-04T19:21:43-04:00 hadrian: Pass lib & include directories to ghc `Setup configure` - - - - - 46bb9a79 by Ben Gamari at 2025-09-04T19:21:44-04:00 rts/IPE: Fix compilation when zstd is enabled This was broken by the refactoring undertaken in c80dd91c0bf6ac034f0c592f16c548b9408a8481. Closes #26312. - - - - - 138a6e34 by sheaf at 2025-09-04T19:22:46-04:00 Make mkCast assertion a bit clearer This commit changes the assertion message that gets printed when one calls mkCast with a coercion whose kind does not match the type of the inner expression. I always found the assertion message a bit confusing, as it didn't clearly state what exactly was the error. - - - - - 9d626be1 by sheaf at 2025-09-04T19:22:46-04:00 Simplifier/rules: fix mistakes in Notes & comments - - - - - 94b62aa7 by Simon Peyton Jones at 2025-09-08T03:37:14-04:00 Refactor ForAllCo This is a pure refactor, addressing #26389. It arranges that the kind coercion in a ForAllCo is a MCoercion, rather than a plain Coercion, thus removing redundancy in the common case. See (FC8) in Note [ForAllCo] It's a nice cleanup. - - - - - 624afa4a by sheaf at 2025-09-08T03:38:05-04:00 Use tcMkScaledFunTys in matchExpectedFunTys We should use tcMkScaledFunTys rather than mkScaledFunTys in GHC.Tc.Utils.Unify.matchExpectedFunTys, as the latter crashes when the kind of the result type is a bare metavariable. We know the result is always Type-like, so we don't need scaledFunTys to try to rediscover that from the kind. Fixes #26277 - - - - - 0975d2b6 by sheaf at 2025-09-08T03:38:54-04:00 Revert "Remove hptAllFamInstances usage during upsweep" This reverts commit 3bf6720eff5e86e673568e756161e6d6150eb440. - - - - - 0cf34176 by soulomoon at 2025-09-08T03:38:54-04:00 Family consistency checks: add test for #26154 This commit adds the test T26154, to make sure that GHC doesn't crash when performing type family consistency checks. This test case was extracted from Agda. Fixes #26154 - - - - - ba210d98 by Simon Peyton Jones at 2025-09-08T16:26:36+01:00 Report solid equality errors before custom errors This MR fixes #26255 by * Reporting solid equality errors like Int ~ Bool before "custom type errors". See comments in `report1` in `reportWanteds` * Suppressing errors that arise from superclasses of Wanteds. See (SCE1) in Note [Suppressing confusing errors] More details in #26255. - - - - - b6249140 by Simon Peyton Jones at 2025-09-10T10:42:38-04:00 Fix a scoping error in Specialise This small patch fixes #26329, which triggered a scoping error. Test is in T21391, with -fpolymorphic-specialisation enabled - - - - - 45305ab8 by sheaf at 2025-09-10T10:43:29-04:00 Make rationalTo{Float,Double} inline in phase 0 We hold off on inlining these until phase 0 to allow constant-folding rules to fire. However, once we get to phase 0, we should inline them, e.g. to expose unboxing opportunities. See CLC proposal #356. - - - - - 0959d4bc by Andreas Klebinger at 2025-09-10T10:44:12-04:00 Add regression test for #26056 - - - - - dc79593d by sheaf at 2025-09-10T10:45:01-04:00 Deep subsumption: unify mults without tcEqMult As seen in #26332, we may well end up with a non-reflexive multiplicity coercion when doing deep subsumption. We should do the same thing that we do without deep subsumption: unify the multiplicities normally, without requiring that the coercion is reflexive (which is what 'tcEqMult' was doing). Fixes #26332 - - - - - 4bfe2269 by sheaf at 2025-09-10T10:45:50-04:00 lint-codes: fixup MSYS drive letter on Windows This change ensures that System.Directory.listDirectory doesn't trip up on an MSYS-style path like '/c/Foo' when trying to list all testsuite stdout/stderr files as required for testing coverage of GHC diagnostic codes in the testsuite. Fixes #25178 - - - - - 56540775 by Ben Gamari at 2025-09-10T10:46:32-04:00 gitlab-ci: Disable split sections on FreeBSD Due to #26303. - - - - - 1537784b by Moritz Angermann at 2025-09-10T10:47:13-04:00 Improve mach-o relocation information This change adds more information about the symbol and addresses we try to relocate in the linker. This significantly helps when deubbging relocation issues reported by users. - - - - - 4e67855b by Moritz Angermann at 2025-09-10T10:47:54-04:00 test.mk expect GhcLeadingUnderscore, not LeadingUnderscore (in line with the other Ghc prefixed variables. - - - - - c1cdd265 by Moritz Angermann at 2025-09-10T10:48:35-04:00 testsuite: Fix broken exec_signals_child.c There is no signal 0. The signal mask is 1-32. - - - - - 99ac335c by Moritz Angermann at 2025-09-10T10:49:15-04:00 testsuite: clarify Windows/Darwin locale rationale for skipping T6037 T2507 T8959a - - - - - 0e8fa77a by Moritz Angermann at 2025-09-10T10:49:56-04:00 Skip broken tests on macOS (due to leading underscore not handled properly in the expected output.) - - - - - 28570c59 by Zubin Duggal at 2025-09-10T10:50:37-04:00 docs(sphinx): fix links to reverse flags when using the :ghc-flag:`-fno-<flag>` syntax This solution is rather hacky and I suspect there is a better way to do this but I don't know enough about Sphinx to do better. Fixes #26352 - - - - - d17257ed by Cheng Shao at 2025-09-10T17:01:27+02:00 rel-eng: update alpine images to 3.22 This patch is a part of #25876 and updates alpine images to 3.22, while still retaining 3.12 for x86_64 fully_static bindists. ------------------------- Metric Decrease: MultiComponentModulesRecomp ------------------------- - - - - - db3276bb by Sylvain Henry at 2025-09-11T11:27:28-04:00 T16180: indicate that the stack isn't executable - - - - - 11eeeba7 by Sylvain Henry at 2025-09-11T11:27:28-04:00 Fix some tests (statically linked GHC vs libc) When GHC is linked statically, the stdout C global variable that GHC uses isn't shared with the stdout C global variable used by loaded code. As a consequence, the latter must be explicitly flushed because GHC won't flush it before exiting. - - - - - 80a07571 by Sylvain Henry at 2025-09-11T11:28:18-04:00 Testsuite: fix debug_rts detection Running the testsuite without Hadrian should set config.debug_rts correctly too. - - - - - 62ae97de by Duncan Coutts at 2025-09-12T13:23:33-04:00 Handle heap allocation failure in I/O primops The current I/O managers do not use allocateMightFail, but future ones will. To support this properly we need to be able to return to the primop with a failure. We simply use a bool return value. Currently however, we will just throw an exception rather than calling the GC because that's what all the other primops do too. For the general issue of primops invoking GC and retrying, see https://gitlab.haskell.org/ghc/ghc/-/issues/24105 - - - - - cb9093f5 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Move (and rename) scheduleStartSignalHandlers into RtsSignals.h Previously it was a local helper (static) function in Schedule.c. Rename it to startPendingSignalHandlers and deifine it as an inline header function in RtsSignals.h. So it should still be fast. Each (new style) I/O manager is going to need to do the same, so eliminating the duplication now makes sense. - - - - - 9736d44a by Duncan Coutts at 2025-09-12T13:23:33-04:00 Reduce detail in printThreadBlockage I/O blocking cases The printThreadBlockage is used in debug tracing output. For the cases BlockedOn{Read,Write,Delay} the output previously included the fd that was being waited on, and the delay target wake time. Superficially this sounds useful, but it's clearly not that useful because it was already wrong for the Win32 non-threaded I/O manager. In that situation it will print garbage (the async_result pointer, cast to a fd or a time). So given that it apparently never mattered that the information was accurate, then it's hardly a big jump to say it doesn't matter if it is present at all. A good reason to remove it is that otherwise we have to make a new API and a per-I/O manager implementation to fetch the information. And for some I/O manager implementations, this information is not available. It is not available in the win32 non-threaded I/O manager. And for some future Linux ones, there is no need for the fd to be stored, so storing it would be just extra space used for very little gain. So the simplest thing is to just remove the detail. - - - - - bc0f2d5d by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add TimeoutQueue.{c,h} and corresponding tests A data structure used to efficiently manage a collection of timeouts. It is a priority queue based on absolute expiry time. It uses 64bit high-precision Time for the keys. The values are normal closures which allows for example using MVars for unblocking. It is common in many applications for timeouts to be created and then deleted or altered before they expire. Thus the choice of data structure for timeouts should support this efficiently. The implementation choice here is a leftist heap with the extra feature that it supports deleting arbitrary elements, provided the caller retain a pointer to the element. While the deleteMin operation takes O(log n) time, as in all heap structures, the delete operation for arbitrary elements /typically/ takes O(1), and only O(log n) in the worst case. In practice, when managing thousands of timeouts it can be a factor of 10 faster to delete a random timeout queue element than to remove the minimum element. This supports the common use case. The plan is to use it in some of the RTS-side I/O managers to support their timer functionality. In this use case the heap value will be an MVar used for each timeout to unblock waiting threads. - - - - - d1679c9d by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add ClosureTable.{c,h} and corresponding tests A table of pointers to closures on the GC heap with stable indexes. It provides O(1) alloc, free and lookup. The table can be expanded using a simple doubling strategy: in which case allocation is typically O(1) and occasionally O(n) for overall amortised O(1). No shrinking is used. The table itself is heap allocated, and points to other heap objects. As such it's necessary to use markClosureTable to ensure the table is used as a GC root to keep the table entries alive, and maintain proper pointers to them as the GC moves heap objects about. It is designed to be allocated and accesses exclusively from a single capability, enabling it to work without any locking. It is thus similar to the StablePtr table, but per-capability which removes the need for locking. It _should_ also provide lower GC pause times with the non-moving GC by spending only O(1) time in markClosureTable, vs O(n) for markStablePtrTable. The plan is to use it in some of the I/O managers to keep track of in-flight I/O operations (but not timers). This allows the tracking info to be kept on the (unpinned) GC heap, and shared with Haskell code, and by putting a pointer to the tracking information in a table, the index remains stable and can be passed via foreign code (like the kernel). - - - - - 78cb8dd5 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add the StgAsyncIOOp closure type This is intended to be used by multiple I/O managers to help with tracking in-flight I/O operations. It is called asynchronous because from the point of view of the RTS we have many such operations in progress at once. From the point of view of a Haskell thread of course it can look synchronous. - - - - - a2839896 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add StgAsyncIOOp and StgTimeoutQueue to tso->block_info These will be used by new I/O managers, for threads blocked on I/O or timeouts. - - - - - fdc2451c by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add a new I/O manager based on poll() This is a proof of concept I/O manager, to show how to add new ones neatly, using the ClosureTable and TimeoutQueue infrastructure. It uses the old unix poll() API, so it is of course limited in performance by that, but it should have the benefit of wide compatibility. Also we neatly avoid a name clash with the existing select() I/O manager. Compared to the select() I/O manager: 1. beause it uses poll() it is not limited to 1024 file descriptors (but it's still O(n) so don't expect great performance); 2. it should have much faster threadDelay (when using it in lots of threads at once) because it's based on the new TimeoutQueue which is O(log n) rather than O(n). Some of the code related to timers/timouts is put into a shared module rts/posix/Timeout.{h,c} since it is intended to be shared with other similar I/O managers. - - - - - 6c273b76 by Duncan Coutts at 2025-09-12T13:23:34-04:00 Document the I/O managers in the user guide and note the new poll I/O manager in the release notes. - - - - - 824fab74 by Duncan Coutts at 2025-09-12T13:23:34-04:00 Use the poll() I/O manager by default That is, for the non-threaded RTS, prefer the poll I/O manager over the legacy select() one, if both can be enabled. This patch is primarily for CI testing, so we should probably remove this patch before merging. We can change defaults later after wider testing and feedback. - - - - - 39392532 by Luite Stegeman at 2025-09-12T13:24:16-04:00 Support larger unboxed sums Change known constructor encoding for sums in interfaces to use 11 bits for both the arity and the alternative (up from 8 and 6, respectively) - - - - - 2af12e21 by Luite Stegeman at 2025-09-12T13:24:16-04:00 Decompose padding smallest-first in Cmm toplevel data constructors This makes each individual padding value aligned - - - - - 418fa78f by Luite Stegeman at 2025-09-12T13:24:16-04:00 Use slots smaller than word as tag for smaller unboxed sums This packs unboxed sums more efficiently by allowing Word8, Word16 and Word32 for the tag field if the number of constructors is small enough - - - - - 8d7e912f by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Use ByteOrder rather than new Endianness Don't introduce a duplicate datatype when the previous one is equivalent and already used elsewhere. This avoids unnecessary translation between the two. - - - - - 7d378476 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 Read Toolchain.Target files rather than 'settings' This commit makes GHC read `lib/targets/default.target`, a file with a serialized value of `ghc-toolchain`'s `GHC.Toolchain.Target`. Moreover, it removes all the now-redundant entries from `lib/settings` that are configured as part of a `Target` but were being written into `settings`. This makes it easier to support multiple targets from the same compiler (aka runtime retargetability). `ghc-toolchain` can be re-run many times standalone to produce a `Target` description for different targets, and, in the future, GHC will be able to pick at runtime amongst different `Target` files. This commit only makes it read the default `Target` configured in-tree or configured when installing the bindist. The remaining bits of `settings` need to be moved to `Target` in follow up commits, but ultimately they all should be moved since they are per-target relevant. Fixes #24212 On Windows, the constant overhead of parsing a slightly more complex data structure causes some small-allocation tests to wiggle around 1 to 2 extra MB (1-2% in these cases). ------------------------- Metric Increase: MultiLayerModulesTH_OneShot T10421 T10547 T12234 T12425 T13035 T18140 T18923 T9198 TcPlugin_RewritePerf ------------------------- - - - - - e0780a16 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Move TgtHasLibm to per-Target file TargetHasLibm is now part of the per-target configuration Towards #26227 - - - - - 8235dd8c by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Move UseLibdw to per-Target file To support DWARF unwinding, the RTS must be built with the -f+libdw flag and with the -DUSE_LIBDW macro definition. These flags are passed on build by Hadrian when --enable-dwarf-unwinding is specified at configure time. Whether the RTS was built with support for DWARF is a per-target property, and as such, it was moved to the per-target GHC.Toolchain.Target.Target file. Additionally, we keep in the target file the include and library paths for finding libdw, since libdw should be checked at configure time (be it by configure, or ghc-toolchain, that libdw is properly available). Preserving the user-given include paths for libdw facilitates in the future building the RTS on demand for a given target (if we didn't keep that user input, we couldn't) Towards #26227 - - - - - d5ecf2e8 by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00 ghc-toolchain: Make "Support SMP" a query on a Toolchain.Target "Support SMP" is merely a function of target, so we can represent it as such in `ghc-toolchain`. Hadrian queries the Target using this predicate to determine how to build GHC, and GHC queries the Target similarly to report under --info whether it "Support SMP" Towards #26227 - - - - - e07b031a by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00 ghc-toolchain: Make "tgt rts linker only supports shared libs" function on Target Just like with "Support SMP", "target RTS linker only supports shared libraries" is a predicate on a `Target` so we can just compute it when necessary from the given `Target`. Towards #26227 - - - - - 14123ee6 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00 Solve forall-constraints via an implication, again In this earlier commit: commit 953fd8f1dc080f1c56e3a60b4b7157456949be29 Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Mon Jul 21 10:06:43 2025 +0100 Solve forall-constraints immediately, or not at all I used a all-or-nothing strategy for quantified constraints (aka forall-constraints). But alas that fell foul of #26315, and #26376. So this MR goes back to solving a quantified constraint by turning it into an implication; UNLESS we are simplifying constraints from a SPECIALISE pragma, in which case the all-or-nothing strategy is great. See: Note [Solving a Wanted forall-constraint] Other stuff in this MR: * TcSMode becomes a record of flags, rather than an enumeration type; much nicer. * Some fancy footwork to avoid error messages worsening again (The above MR made them better; we want to retain that.) See `GHC.Tc.Errors.Ppr.pprQCOriginExtra`. ------------------------- Metric Decrease: T24471 ------------------------- - - - - - e6c192e2 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00 Add a test case for #26396 ...same bug ast #26315 - - - - - 8f3d80ff by Luite Stegeman at 2025-09-13T08:43:09+02:00 Use mkVirtHeapOffsets for reconstructing terms in RTTI This makes mkVirtHeapOffsets the single source of truth for finding field offsets in closures. - - - - - eb389338 by Luite Stegeman at 2025-09-13T08:43:09+02:00 Sort non-pointer fields by size for more efficient packing This sorts non-pointer fields in mkVirtHeapOffsets, always storing the largest field first. The relative order of equally sized fields remains unchanged. This reduces wasted padding/alignment space in closures with differently sized fields. - - - - - 99b233f4 by Alison at 2025-09-13T16:51:04-04:00 ghc-heap: Fix race condition with profiling builds Apply the same fix from Closures.hs (64fd0fac83) to Heap.hs by adding empty imports to make way-dependent dependencies visible to `ghc -M`. Fixes #15197, #26407 - - - - - 77deaa7a by Cheng Shao at 2025-09-14T21:29:45-04:00 hadrian: build in-tree gmp with -fvisibility=hidden When hadrian builds in-tree gmp, it should build the shared objects with -fvisibility=hidden. The gmp symbols are only used by bignum logic in ghc-internal and shouldn't be exported by the ghc-internal shared library. We should always strive to keep shared library symbol table lean, which benefits platforms with slow dynamic linker or even hard limits about how many symbols can be exported (e.g. macos dyld, win32 dll and wasm dyld). - - - - - 42a18960 by Cheng Shao at 2025-09-14T21:30:26-04:00 Revert "wasm: add brotli compression for ghci browser mode" This reverts commit 731217ce68a1093b5f9e26a07d5bd2cdade2b352. Benchmarks show non-negligible overhead when browser runs on the same host, which is the majority of actual use cases. - - - - - e6755b9f by Cheng Shao at 2025-09-14T21:30:26-04:00 wasm: remove etag logic in ghci browser mode web server This commit removes the etag logic in dyld script's ghci browser mode web server. It was meant to support caching logic of wasm shared libraries, but even if the port is manually specified to make caching even relevant, for localhost the extra overhead around etag logic is simply not worth it according to benchmarks. - - - - - 9bb67ef4 by Sven Tennie at 2025-09-15T11:55:55+00:00 Generate correct test header This increases convenience when copying & pasting... - - - - - 3b86a8d3 by Sven Tennie at 2025-09-15T11:55:55+00:00 foundation test: Fix shift amount (#26248) Shift primops' results are only defined for shift amounts of 0 to word size - 1. The approach is similar to testing div-like operations (which have a constraint regarding zero operands.) This was partly vibe coded (https://github.com/supersven/ghc/pull/1) but then heavily refactored. - - - - - 421 changed files: - .gitlab-ci.yml - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/Dataflow/Label.hs - compiler/GHC/Cmm/Utils.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion.hs-boot - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/Monad.hs - compiler/GHC/Core/Opt/Pipeline/Types.hs - compiler/GHC/Core/Opt/Simplify.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Inline.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - 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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/817899db55a16710506380ebd1dbd1… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/817899db55a16710506380ebd1dbd1… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/ani/kill-popErrCtxt] 29 commits: Handle heap allocation failure in I/O primops
by Apoorv Ingle (＠ani) 15 Sep '25

15 Sep '25

Apoorv Ingle pushed to branch wip/ani/kill-popErrCtxt at Glasgow Haskell Compiler / GHC Commits: 62ae97de by Duncan Coutts at 2025-09-12T13:23:33-04:00 Handle heap allocation failure in I/O primops The current I/O managers do not use allocateMightFail, but future ones will. To support this properly we need to be able to return to the primop with a failure. We simply use a bool return value. Currently however, we will just throw an exception rather than calling the GC because that's what all the other primops do too. For the general issue of primops invoking GC and retrying, see https://gitlab.haskell.org/ghc/ghc/-/issues/24105 - - - - - cb9093f5 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Move (and rename) scheduleStartSignalHandlers into RtsSignals.h Previously it was a local helper (static) function in Schedule.c. Rename it to startPendingSignalHandlers and deifine it as an inline header function in RtsSignals.h. So it should still be fast. Each (new style) I/O manager is going to need to do the same, so eliminating the duplication now makes sense. - - - - - 9736d44a by Duncan Coutts at 2025-09-12T13:23:33-04:00 Reduce detail in printThreadBlockage I/O blocking cases The printThreadBlockage is used in debug tracing output. For the cases BlockedOn{Read,Write,Delay} the output previously included the fd that was being waited on, and the delay target wake time. Superficially this sounds useful, but it's clearly not that useful because it was already wrong for the Win32 non-threaded I/O manager. In that situation it will print garbage (the async_result pointer, cast to a fd or a time). So given that it apparently never mattered that the information was accurate, then it's hardly a big jump to say it doesn't matter if it is present at all. A good reason to remove it is that otherwise we have to make a new API and a per-I/O manager implementation to fetch the information. And for some I/O manager implementations, this information is not available. It is not available in the win32 non-threaded I/O manager. And for some future Linux ones, there is no need for the fd to be stored, so storing it would be just extra space used for very little gain. So the simplest thing is to just remove the detail. - - - - - bc0f2d5d by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add TimeoutQueue.{c,h} and corresponding tests A data structure used to efficiently manage a collection of timeouts. It is a priority queue based on absolute expiry time. It uses 64bit high-precision Time for the keys. The values are normal closures which allows for example using MVars for unblocking. It is common in many applications for timeouts to be created and then deleted or altered before they expire. Thus the choice of data structure for timeouts should support this efficiently. The implementation choice here is a leftist heap with the extra feature that it supports deleting arbitrary elements, provided the caller retain a pointer to the element. While the deleteMin operation takes O(log n) time, as in all heap structures, the delete operation for arbitrary elements /typically/ takes O(1), and only O(log n) in the worst case. In practice, when managing thousands of timeouts it can be a factor of 10 faster to delete a random timeout queue element than to remove the minimum element. This supports the common use case. The plan is to use it in some of the RTS-side I/O managers to support their timer functionality. In this use case the heap value will be an MVar used for each timeout to unblock waiting threads. - - - - - d1679c9d by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add ClosureTable.{c,h} and corresponding tests A table of pointers to closures on the GC heap with stable indexes. It provides O(1) alloc, free and lookup. The table can be expanded using a simple doubling strategy: in which case allocation is typically O(1) and occasionally O(n) for overall amortised O(1). No shrinking is used. The table itself is heap allocated, and points to other heap objects. As such it's necessary to use markClosureTable to ensure the table is used as a GC root to keep the table entries alive, and maintain proper pointers to them as the GC moves heap objects about. It is designed to be allocated and accesses exclusively from a single capability, enabling it to work without any locking. It is thus similar to the StablePtr table, but per-capability which removes the need for locking. It _should_ also provide lower GC pause times with the non-moving GC by spending only O(1) time in markClosureTable, vs O(n) for markStablePtrTable. The plan is to use it in some of the I/O managers to keep track of in-flight I/O operations (but not timers). This allows the tracking info to be kept on the (unpinned) GC heap, and shared with Haskell code, and by putting a pointer to the tracking information in a table, the index remains stable and can be passed via foreign code (like the kernel). - - - - - 78cb8dd5 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add the StgAsyncIOOp closure type This is intended to be used by multiple I/O managers to help with tracking in-flight I/O operations. It is called asynchronous because from the point of view of the RTS we have many such operations in progress at once. From the point of view of a Haskell thread of course it can look synchronous. - - - - - a2839896 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add StgAsyncIOOp and StgTimeoutQueue to tso->block_info These will be used by new I/O managers, for threads blocked on I/O or timeouts. - - - - - fdc2451c by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add a new I/O manager based on poll() This is a proof of concept I/O manager, to show how to add new ones neatly, using the ClosureTable and TimeoutQueue infrastructure. It uses the old unix poll() API, so it is of course limited in performance by that, but it should have the benefit of wide compatibility. Also we neatly avoid a name clash with the existing select() I/O manager. Compared to the select() I/O manager: 1. beause it uses poll() it is not limited to 1024 file descriptors (but it's still O(n) so don't expect great performance); 2. it should have much faster threadDelay (when using it in lots of threads at once) because it's based on the new TimeoutQueue which is O(log n) rather than O(n). Some of the code related to timers/timouts is put into a shared module rts/posix/Timeout.{h,c} since it is intended to be shared with other similar I/O managers. - - - - - 6c273b76 by Duncan Coutts at 2025-09-12T13:23:34-04:00 Document the I/O managers in the user guide and note the new poll I/O manager in the release notes. - - - - - 824fab74 by Duncan Coutts at 2025-09-12T13:23:34-04:00 Use the poll() I/O manager by default That is, for the non-threaded RTS, prefer the poll I/O manager over the legacy select() one, if both can be enabled. This patch is primarily for CI testing, so we should probably remove this patch before merging. We can change defaults later after wider testing and feedback. - - - - - 39392532 by Luite Stegeman at 2025-09-12T13:24:16-04:00 Support larger unboxed sums Change known constructor encoding for sums in interfaces to use 11 bits for both the arity and the alternative (up from 8 and 6, respectively) - - - - - 2af12e21 by Luite Stegeman at 2025-09-12T13:24:16-04:00 Decompose padding smallest-first in Cmm toplevel data constructors This makes each individual padding value aligned - - - - - 418fa78f by Luite Stegeman at 2025-09-12T13:24:16-04:00 Use slots smaller than word as tag for smaller unboxed sums This packs unboxed sums more efficiently by allowing Word8, Word16 and Word32 for the tag field if the number of constructors is small enough - - - - - 8d7e912f by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Use ByteOrder rather than new Endianness Don't introduce a duplicate datatype when the previous one is equivalent and already used elsewhere. This avoids unnecessary translation between the two. - - - - - 7d378476 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 Read Toolchain.Target files rather than 'settings' This commit makes GHC read `lib/targets/default.target`, a file with a serialized value of `ghc-toolchain`'s `GHC.Toolchain.Target`. Moreover, it removes all the now-redundant entries from `lib/settings` that are configured as part of a `Target` but were being written into `settings`. This makes it easier to support multiple targets from the same compiler (aka runtime retargetability). `ghc-toolchain` can be re-run many times standalone to produce a `Target` description for different targets, and, in the future, GHC will be able to pick at runtime amongst different `Target` files. This commit only makes it read the default `Target` configured in-tree or configured when installing the bindist. The remaining bits of `settings` need to be moved to `Target` in follow up commits, but ultimately they all should be moved since they are per-target relevant. Fixes #24212 On Windows, the constant overhead of parsing a slightly more complex data structure causes some small-allocation tests to wiggle around 1 to 2 extra MB (1-2% in these cases). ------------------------- Metric Increase: MultiLayerModulesTH_OneShot T10421 T10547 T12234 T12425 T13035 T18140 T18923 T9198 TcPlugin_RewritePerf ------------------------- - - - - - e0780a16 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Move TgtHasLibm to per-Target file TargetHasLibm is now part of the per-target configuration Towards #26227 - - - - - 8235dd8c by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Move UseLibdw to per-Target file To support DWARF unwinding, the RTS must be built with the -f+libdw flag and with the -DUSE_LIBDW macro definition. These flags are passed on build by Hadrian when --enable-dwarf-unwinding is specified at configure time. Whether the RTS was built with support for DWARF is a per-target property, and as such, it was moved to the per-target GHC.Toolchain.Target.Target file. Additionally, we keep in the target file the include and library paths for finding libdw, since libdw should be checked at configure time (be it by configure, or ghc-toolchain, that libdw is properly available). Preserving the user-given include paths for libdw facilitates in the future building the RTS on demand for a given target (if we didn't keep that user input, we couldn't) Towards #26227 - - - - - d5ecf2e8 by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00 ghc-toolchain: Make "Support SMP" a query on a Toolchain.Target "Support SMP" is merely a function of target, so we can represent it as such in `ghc-toolchain`. Hadrian queries the Target using this predicate to determine how to build GHC, and GHC queries the Target similarly to report under --info whether it "Support SMP" Towards #26227 - - - - - e07b031a by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00 ghc-toolchain: Make "tgt rts linker only supports shared libs" function on Target Just like with "Support SMP", "target RTS linker only supports shared libraries" is a predicate on a `Target` so we can just compute it when necessary from the given `Target`. Towards #26227 - - - - - 14123ee6 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00 Solve forall-constraints via an implication, again In this earlier commit: commit 953fd8f1dc080f1c56e3a60b4b7157456949be29 Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Mon Jul 21 10:06:43 2025 +0100 Solve forall-constraints immediately, or not at all I used a all-or-nothing strategy for quantified constraints (aka forall-constraints). But alas that fell foul of #26315, and #26376. So this MR goes back to solving a quantified constraint by turning it into an implication; UNLESS we are simplifying constraints from a SPECIALISE pragma, in which case the all-or-nothing strategy is great. See: Note [Solving a Wanted forall-constraint] Other stuff in this MR: * TcSMode becomes a record of flags, rather than an enumeration type; much nicer. * Some fancy footwork to avoid error messages worsening again (The above MR made them better; we want to retain that.) See `GHC.Tc.Errors.Ppr.pprQCOriginExtra`. ------------------------- Metric Decrease: T24471 ------------------------- - - - - - e6c192e2 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00 Add a test case for #26396 ...same bug ast #26315 - - - - - 8f3d80ff by Luite Stegeman at 2025-09-13T08:43:09+02:00 Use mkVirtHeapOffsets for reconstructing terms in RTTI This makes mkVirtHeapOffsets the single source of truth for finding field offsets in closures. - - - - - eb389338 by Luite Stegeman at 2025-09-13T08:43:09+02:00 Sort non-pointer fields by size for more efficient packing This sorts non-pointer fields in mkVirtHeapOffsets, always storing the largest field first. The relative order of equally sized fields remains unchanged. This reduces wasted padding/alignment space in closures with differently sized fields. - - - - - 99b233f4 by Alison at 2025-09-13T16:51:04-04:00 ghc-heap: Fix race condition with profiling builds Apply the same fix from Closures.hs (64fd0fac83) to Heap.hs by adding empty imports to make way-dependent dependencies visible to `ghc -M`. Fixes #15197, #26407 - - - - - 77deaa7a by Cheng Shao at 2025-09-14T21:29:45-04:00 hadrian: build in-tree gmp with -fvisibility=hidden When hadrian builds in-tree gmp, it should build the shared objects with -fvisibility=hidden. The gmp symbols are only used by bignum logic in ghc-internal and shouldn't be exported by the ghc-internal shared library. We should always strive to keep shared library symbol table lean, which benefits platforms with slow dynamic linker or even hard limits about how many symbols can be exported (e.g. macos dyld, win32 dll and wasm dyld). - - - - - 42a18960 by Cheng Shao at 2025-09-14T21:30:26-04:00 Revert "wasm: add brotli compression for ghci browser mode" This reverts commit 731217ce68a1093b5f9e26a07d5bd2cdade2b352. Benchmarks show non-negligible overhead when browser runs on the same host, which is the majority of actual use cases. - - - - - e6755b9f by Cheng Shao at 2025-09-14T21:30:26-04:00 wasm: remove etag logic in ghci browser mode web server This commit removes the etag logic in dyld script's ghci browser mode web server. It was meant to support caching logic of wasm shared libraries, but even if the port is manually specified to make caching even relevant, for localhost the extra overhead around etag logic is simply not worth it according to benchmarks. - - - - - 8e328148 by Apoorv Ingle at 2025-09-14T23:27:00-05:00 This commit: - Streamlines implementations of `tcExpr` and `tcXExpr` to work on `XExpr` Calls `setInGeneratedCode` everytime the typechecker goes over an `XExpr` - Kills `VACtxt` (and its associated VAExpansion and VACall) datatype, it is subsumed by simply a SrcSpan. - Kills the function `addHeadCtxt` as it is now mearly setting a location - The function `tcValArgs` does its own argument number management - Makes `splitHsApps` not look through `XExpr` - `tcExprSigma` is called if the head of the expression after calling `splitHsApps` turns out to be an `XExpr` - Removes location information from `OrigPat` payload - Removes special case of tcBody from `tcLambdaMatches` - Removes special case of `dsExpr` for `ExpandedThingTc` - Moves `setQLInstLevel` inside `tcInstFun` - Rename `HsThingRn` to `SrcCodeCtxt` - Kills `tcl_in_gen_code` and `tcl_err_ctxt`. It is subsumed by `ErrCtxtStack` - Kills `ExpectedFunTyOrig`. It is subsumed by `CtOrigin` - Fixes `CtOrigin` for `HsProjection` case in `exprCtOrigin`. It was previously assigned to be `SectionOrigin`. It is now just the expression - Adds a new `CtOrigin.ExpansionOrigin` for storing the original syntax - Adds a new `CtOrigin.ExpectedTySyntax` as a replacement for `ExpectedTySyntaxOp`. Cannot kill the former yet because of `ApplicativeDo` - Renames `tcMonoExpr` -> `tcMonoLExpr`, `tcMonoExprNC` -> `tcMonoLExpr` - Renames `EValArg`, `EValArgQL` fields: `ea_ctxt` -> `ea_loc_span` and `eaql_ctx` -> `eaql_loc_span` Notes added [Error Context Stack] Notes updated Note [Expanding HsDo with XXExprGhcRn] ------------------------- Metric Decrease: T9020 ------------------------- - - - - - 08ea0cbf by Apoorv Ingle at 2025-09-14T23:33:07-05:00 some initial experiment to make ErrCtxt more expressive - - - - - 196 changed files: - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Cmm/Utils.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Pmc.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Runtime/Heap/Inspect.hs - compiler/GHC/Settings.hs - compiler/GHC/Settings/IO.hs - compiler/GHC/Stg/Unarise.hs - compiler/GHC/StgToCmm/DataCon.hs - compiler/GHC/StgToCmm/Layout.hs - compiler/GHC/SysTools/BaseDir.hs - compiler/GHC/Tc/Deriv/Utils.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Gen/App.hs - + compiler/GHC/Tc/Gen/App.hs-boot - compiler/GHC/Tc/Gen/Do.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Expr.hs-boot - compiler/GHC/Tc/Gen/Head.hs - compiler/GHC/Tc/Gen/Match.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Instance/Class.hs - compiler/GHC/Tc/Solver.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/Solver/InertSet.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/Solver/Solve.hs-boot - compiler/GHC/Tc/Types/Constraint.hs - compiler/GHC/Tc/Types/ErrCtxt.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/LclEnv.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Zonk/TcType.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/RepType.hs - compiler/ghc.cabal.in - configure.ac - distrib/configure.ac.in - docs/users_guide/9.16.1-notes.rst - docs/users_guide/runtime_control.rst - hadrian/bindist/Makefile - hadrian/bindist/config.mk.in - hadrian/cfg/default.host.target.in - hadrian/cfg/default.target.in - hadrian/cfg/system.config.in - hadrian/src/Base.hs - hadrian/src/Oracles/Flag.hs - hadrian/src/Oracles/Setting.hs - hadrian/src/Rules/Generate.hs - hadrian/src/Rules/Gmp.hs - hadrian/src/Settings/Packages.hs - libraries/base/src/GHC/RTS/Flags.hs - libraries/ghc-boot/GHC/Settings/Utils.hs - libraries/ghc-boot/ghc-boot.cabal.in - libraries/ghc-heap/GHC/Exts/Heap.hs - libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc - libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs - m4/fp_find_libdw.m4 - − m4/fp_settings.m4 - m4/fp_setup_windows_toolchain.m4 - m4/ghc_toolchain.m4 - m4/prep_target_file.m4 - + m4/subst_tooldir.m4 - mk/hsc2hs.in - + rts/ClosureTable.c - + rts/ClosureTable.h - rts/IOManager.c - rts/IOManager.h - rts/IOManagerInternals.h - rts/PrimOps.cmm - rts/RtsSignals.h - rts/Schedule.c - rts/StgMiscClosures.cmm - rts/Threads.c - + rts/TimeoutQueue.c - + rts/TimeoutQueue.h - rts/configure.ac - rts/include/rts/Constants.h - rts/include/rts/Flags.h - rts/include/rts/storage/Closures.h - rts/include/rts/storage/TSO.h - rts/include/stg/MiscClosures.h - + rts/posix/Poll.c - + rts/posix/Poll.h - + rts/posix/Timeout.c - + rts/posix/Timeout.h - rts/rts.cabal - testsuite/tests/backpack/should_fail/bkpfail11.stderr - testsuite/tests/backpack/should_fail/bkpfail43.stderr - testsuite/tests/codeGen/should_compile/T25166.stdout → testsuite/tests/codeGen/should_compile/T25166.stdout-ws-32 - + testsuite/tests/codeGen/should_compile/T25166.stdout-ws-64 - testsuite/tests/codeGen/should_run/T13825-unit.hs - + testsuite/tests/deSugar/should_compile/T10662 - 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testsuite/tests/interface-stability/ghc-experimental-exports.stdout - testsuite/tests/interface-stability/ghc-experimental-exports.stdout-mingw32 - testsuite/tests/parser/should_fail/RecordDotSyntaxFail10.stderr - testsuite/tests/parser/should_fail/RecordDotSyntaxFail11.stderr - testsuite/tests/plugins/test-defaulting-plugin.stderr - testsuite/tests/polykinds/T13393.stderr - testsuite/tests/printer/T17697.stderr - testsuite/tests/quantified-constraints/T19690.stderr - testsuite/tests/quantified-constraints/T19921.stderr - testsuite/tests/quantified-constraints/T21006.stderr - testsuite/tests/rep-poly/RepPolyDoBind.stderr - testsuite/tests/rep-poly/RepPolyDoBody1.stderr - testsuite/tests/rep-poly/RepPolyDoBody2.stderr - testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr - testsuite/tests/roles/should_fail/RolesIArray.stderr - + testsuite/tests/rts/ClosureTable.hs - + testsuite/tests/rts/ClosureTable_c.c - + testsuite/tests/rts/TimeoutQueue.c - + testsuite/tests/rts/TimeoutQueue.stdout - testsuite/tests/rts/all.T - testsuite/tests/simplCore/should_compile/DsSpecPragmas.hs - testsuite/tests/simplCore/should_compile/DsSpecPragmas.stderr - testsuite/tests/typecheck/should_compile/T14434.hs - testsuite/tests/typecheck/should_compile/T14590.stderr - + testsuite/tests/typecheck/should_compile/T25996.hs - + testsuite/tests/typecheck/should_compile/T26376.hs - testsuite/tests/typecheck/should_compile/all.T - testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr - testsuite/tests/typecheck/should_fail/DoExpansion1.stderr - testsuite/tests/typecheck/should_fail/DoExpansion2.stderr - testsuite/tests/typecheck/should_fail/T10971d.stderr - testsuite/tests/typecheck/should_fail/T13311.stderr - testsuite/tests/typecheck/should_fail/T15801.stderr - testsuite/tests/typecheck/should_fail/T19627.stderr - testsuite/tests/typecheck/should_fail/T20666.stderr - testsuite/tests/typecheck/should_fail/T20666a.stderr - testsuite/tests/typecheck/should_fail/T20666b.stderr - testsuite/tests/typecheck/should_fail/T22912.stderr - testsuite/tests/typecheck/should_fail/T23427.stderr - testsuite/tests/typecheck/should_fail/T24064.stderr - + testsuite/tests/typecheck/should_fail/T25970.hs - + testsuite/tests/typecheck/should_fail/T25996.hs - testsuite/tests/typecheck/should_fail/T3323.stderr - testsuite/tests/typecheck/should_fail/T3613.stderr - testsuite/tests/typecheck/should_fail/T7851.stderr - testsuite/tests/typecheck/should_fail/T8603.stderr - testsuite/tests/typecheck/should_fail/T9612.stderr - testsuite/tests/typecheck/should_fail/tcfail102.stderr - testsuite/tests/typecheck/should_fail/tcfail128.stderr - testsuite/tests/typecheck/should_fail/tcfail168.stderr - + testsuite/tests/unboxedsums/UbxSumUnpackedSize.hs - + testsuite/tests/unboxedsums/UbxSumUnpackedSize.stdout - + testsuite/tests/unboxedsums/UbxSumUnpackedSize.stdout-ws-32 - testsuite/tests/unboxedsums/all.T - testsuite/tests/unboxedsums/unboxedsums_unit_tests.hs - testsuite/tests/warnings/should_fail/CaretDiagnostics1.stderr - utils/ghc-pkg/Main.hs - utils/ghc-pkg/ghc-pkg.cabal.in - utils/ghc-toolchain/exe/Main.hs - utils/ghc-toolchain/ghc-toolchain.cabal - + utils/ghc-toolchain/src/GHC/Toolchain/Library.hs - utils/ghc-toolchain/src/GHC/Toolchain/PlatformDetails.hs - utils/ghc-toolchain/src/GHC/Toolchain/Target.hs - utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cpp.hs - utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cxx.hs - utils/jsffi/dyld.mjs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e95889e1d3d604fb26b23d44e1d817… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e95889e1d3d604fb26b23d44e1d817… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/spj-apporv-Oct24] This commit:
by Apoorv Ingle (＠ani) 15 Sep '25

15 Sep '25

Apoorv Ingle pushed to branch wip/spj-apporv-Oct24 at Glasgow Haskell Compiler / GHC Commits: 8e328148 by Apoorv Ingle at 2025-09-14T23:27:00-05:00 This commit: - Streamlines implementations of `tcExpr` and `tcXExpr` to work on `XExpr` Calls `setInGeneratedCode` everytime the typechecker goes over an `XExpr` - Kills `VACtxt` (and its associated VAExpansion and VACall) datatype, it is subsumed by simply a SrcSpan. - Kills the function `addHeadCtxt` as it is now mearly setting a location - The function `tcValArgs` does its own argument number management - Makes `splitHsApps` not look through `XExpr` - `tcExprSigma` is called if the head of the expression after calling `splitHsApps` turns out to be an `XExpr` - Removes location information from `OrigPat` payload - Removes special case of tcBody from `tcLambdaMatches` - Removes special case of `dsExpr` for `ExpandedThingTc` - Moves `setQLInstLevel` inside `tcInstFun` - Rename `HsThingRn` to `SrcCodeCtxt` - Kills `tcl_in_gen_code` and `tcl_err_ctxt`. It is subsumed by `ErrCtxtStack` - Kills `ExpectedFunTyOrig`. It is subsumed by `CtOrigin` - Fixes `CtOrigin` for `HsProjection` case in `exprCtOrigin`. It was previously assigned to be `SectionOrigin`. It is now just the expression - Adds a new `CtOrigin.ExpansionOrigin` for storing the original syntax - Adds a new `CtOrigin.ExpectedTySyntax` as a replacement for `ExpectedTySyntaxOp`. Cannot kill the former yet because of `ApplicativeDo` - Renames `tcMonoExpr` -> `tcMonoLExpr`, `tcMonoExprNC` -> `tcMonoLExpr` - Renames `EValArg`, `EValArgQL` fields: `ea_ctxt` -> `ea_loc_span` and `eaql_ctx` -> `eaql_loc_span` Notes added [Error Context Stack] Notes updated Note [Expanding HsDo with XXExprGhcRn] ------------------------- Metric Decrease: T9020 ------------------------- - - - - - 60 changed files: - compiler/GHC/Hs.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Pmc.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Gen/App.hs - + compiler/GHC/Tc/Gen/App.hs-boot - compiler/GHC/Tc/Gen/Do.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Expr.hs-boot - compiler/GHC/Tc/Gen/Head.hs - compiler/GHC/Tc/Gen/Match.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Instance/Class.hs - compiler/GHC/Tc/Types/ErrCtxt.hs - compiler/GHC/Tc/Types/LclEnv.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/Unify.hs - + testsuite/tests/deSugar/should_compile/T10662 - testsuite/tests/default/default-fail05.stderr - + testsuite/tests/ghci.debugger/Do - + testsuite/tests/ghci.debugger/Do.hs - + testsuite/tests/ghci.debugger/T25996.hs - testsuite/tests/indexed-types/should_fail/T2693.stderr - testsuite/tests/indexed-types/should_fail/T5439.stderr - testsuite/tests/parser/should_fail/RecordDotSyntaxFail10.stderr - testsuite/tests/parser/should_fail/RecordDotSyntaxFail11.stderr - testsuite/tests/plugins/test-defaulting-plugin.stderr - testsuite/tests/polykinds/T13393.stderr - testsuite/tests/printer/T17697.stderr - testsuite/tests/rep-poly/RepPolyDoBind.stderr - testsuite/tests/rep-poly/RepPolyDoBody1.stderr - testsuite/tests/rep-poly/RepPolyDoBody2.stderr - testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr - testsuite/tests/typecheck/should_compile/T14590.stderr - + testsuite/tests/typecheck/should_compile/T25996.hs - testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr - testsuite/tests/typecheck/should_fail/DoExpansion1.stderr - testsuite/tests/typecheck/should_fail/DoExpansion2.stderr - testsuite/tests/typecheck/should_fail/T10971d.stderr - testsuite/tests/typecheck/should_fail/T13311.stderr - testsuite/tests/typecheck/should_fail/T24064.stderr - + testsuite/tests/typecheck/should_fail/T25970.hs - + testsuite/tests/typecheck/should_fail/T25996.hs - testsuite/tests/typecheck/should_fail/T3323.stderr - testsuite/tests/typecheck/should_fail/T3613.stderr - testsuite/tests/typecheck/should_fail/T7851.stderr - testsuite/tests/typecheck/should_fail/T8603.stderr - testsuite/tests/typecheck/should_fail/T9612.stderr - testsuite/tests/typecheck/should_fail/tcfail102.stderr - testsuite/tests/typecheck/should_fail/tcfail128.stderr - testsuite/tests/typecheck/should_fail/tcfail168.stderr - testsuite/tests/warnings/should_fail/CaretDiagnostics1.stderr The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/8e328148e8d611996077154d7c7af97… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/8e328148e8d611996077154d7c7af97… You're receiving this email because of your account on gitlab.haskell.org.

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