April 2026 - ghc-commits

[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 9 commits: ghc: Distinguish between having an interpreter and having an internal one
by Marge Bot (＠marge-bot) 27 Apr '26

27 Apr '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: adadb4d7 by Sven Tennie at 2026-04-27T16:08:41-04:00 ghc: Distinguish between having an interpreter and having an internal one Actually, these are related but different things: - ghc can run an interpreter (either internal or external) - ghc is compiled with an internal interpreter Splitting the logic solves compiler warnings and expresses the intent better. - - - - - 4a07935b by Vladislav Zavialov at 2026-04-27T16:08:42-04:00 Refactor HsWildCardTy to use HoleKind (#27111) The payload of this patch is that the extension fields of HsWildCardTy and HsHole now match: type instance XWildCardTy Ghc{Ps,Rn} = HoleKind type instance XHole Ghc{Ps,Rn} = HoleKind This is progress towards unification of HsExpr and HsType. Test case: T25121_status In addition to that, exact-printing of infix holes is fixed. Test case: PprInfixHole - - - - - 96b1c440 by Vladislav Zavialov at 2026-04-27T16:08:43-04:00 Move NamespaceSpecifier from x-fields into the AST proper (#26678) This refactoring moves NamespaceSpecifier out of extension fields and into the AST proper, as it is part of the user-written source, and is not pass-specific. Summary of changes: * Move NamespaceSpecifier from GHC/Hs/Basic.hs to Language/Haskell/Syntax/ImpExp.hs and parameterise it by the compiler pass, creating the necessary extension points * Move NamespaceSpecifier out of XFixitySig into FixitySig * Move NamespaceSpecifier out of XIEThingAll (IEThingAllExt) into IEThingAll * Move NamespaceSpecifier out of XIEWholeNamespace (IEWholeNamespaceExt) into IEWholeNamespace This is a pure refactoring with no change in behaviour. - - - - - b75f59be by Wen Kokke at 2026-04-27T16:08:47-04:00 rts: Add dynamic trace flags API This commit adds an API to the RTS (exposed via Rts.h) that allows users to dynamically change the trace flags. Prior to this commit, users were able to stop and start the profiling and heap profiling timers (via startProfTimer/stopProfTimer and startHeapProfTimer/stopHeapProfTimer). This extends that functionality to also cover the core event types. The getTraceFlag/setTraceFlag functions read and write the values of the trace flag cache, which is allocated by Trace.c, rather than modifying the members of RtsFlags.TraceFlags. This is done under the assumption that the members of RtsFlags should not be modified after RTS initialisation. Consequently, if the user modifies the trace flags using setTraceFlag, the object returned by getTraceFlags (from base) will not reflect these changes. The trace flags are not protected by locks of any sort. Hence, these functions are not thread-safe. However, the trace flags are not modified by the RTS after initialisation, only read, so the race conditions introduced by one user modifying them are most likely benign. This PR also puts the trace flag cache in a single global struct, as opposed to a collection of global variables, and changes the types of the individual flags from uint8_t to bool, as these have the same size on both Clang and GCC and are a better semantic match. Prior to the change to uint8_t, they had type int, see 42c47cd6. Even with its deprecation in C23, I don't think there should be any issue depending on stdbool.h. The TRACE_X macros are redefined to access the global struct, with values cast to const bool to ensure they are read-only. - - - - - 225e8279 by Wen Kokke at 2026-04-27T16:08:47-04:00 rts: Ensure TRACE_X values are used in place of RtsFlags.TraceFlags.X - - - - - e2637b60 by Wen Kokke at 2026-04-27T16:08:47-04:00 rts: Fix nonmoving-GC tracing The current nonmoving-GC tracing functions were written in a different style from the other tracing functions. They were directly implemented as, e.g., a traceConcMarkEnd function that called postConcMarkEnd. The other tracing functions are implemented as, e.g., traceThreadLabel_, a function that posts the thread label event, and traceThreadLabel, a macro that checks whether TRACE_scheduler is set. This commit fixes that implementation, and ensures that the nonmoving-GC tracing functions only emit events if nonmoving-GC tracing is enabled. - - - - - 868fe8e8 by Wen Kokke at 2026-04-27T16:08:47-04:00 rts: Add SymI_HasProto for get/setTraceFlag - - - - - 04f27095 by Wen Kokke at 2026-04-27T16:08:47-04:00 rts: Add SymI_HasProto for start/endEventLogging - - - - - e326cd4c by Simon Peyton Jones at 2026-04-27T16:08:48-04:00 Fix assertion check in checkResultTy As #27210 shows, the assertion was a little bit too eager. I refactored a bit by moving some code from GHC.Tc.Gen.App to GHC.Tc.Utils.Unify; see the new function tcSubTypeApp, which replaces tcSubTypeDS - - - - - 60 changed files: - + changelog.d/T19174.md - + changelog.d/ghc-api-holes-ast-27111 - + changelog.d/ghc-api-namespace-specifier-26678 - compiler/GHC/Hs/Basic.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Expr.hs-boot - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore/Docs.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - compiler/GHC/Rename/Bind.hs - compiler/GHC/Rename/Env.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Gen/Head.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/ThToHs.hs - compiler/GHC/Types/Name/Reader.hs - compiler/Language/Haskell/Syntax/Binds.hs - compiler/Language/Haskell/Syntax/Decls.hs - compiler/Language/Haskell/Syntax/Extension.hs - compiler/Language/Haskell/Syntax/ImpExp.hs - ghc/GHC/Driver/Session/Mode.hs - ghc/GHCi/UI.hs - ghc/Main.hs - ghc/ghc-bin.cabal.in - hadrian/src/Settings/Packages.hs - rts/RtsSymbols.c - rts/Trace.c - rts/Trace.h - rts/include/rts/EventLogWriter.h - rts/sm/NonMoving.c - testsuite/tests/ghc-api/T25121_status.stdout - testsuite/tests/haddock/should_compile_flag_haddock/T17544_kw.stderr - testsuite/tests/parser/should_compile/T20846.stderr - testsuite/tests/printer/Makefile - + testsuite/tests/printer/PprInfixHole.hs - testsuite/tests/printer/all.T - + testsuite/tests/typecheck/should_fail/T27210.hs - + testsuite/tests/typecheck/should_fail/T27210.stderr - testsuite/tests/typecheck/should_fail/all.T - utils/check-exact/ExactPrint.hs - utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5af4b7c79897e3f9965b9f7399ee1f… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5af4b7c79897e3f9965b9f7399ee1f… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc][wip/andreask/split-driver-main] Split GHC.Driver.Main.hs up into multiple components.
by Andreas Klebinger (＠AndreasK) 27 Apr '26

27 Apr '26

Andreas Klebinger pushed to branch wip/andreask/split-driver-main at Glasgow Haskell Compiler / GHC Commits: e545f25c by Andreas Klebinger at 2026-04-27T21:14:39+02:00 Split GHC.Driver.Main.hs up into multiple components. This commit splits GHC.Driver.Main into four components: * GHC.Driver.Main.Compile * GHC.Driver.Main.Hsc * GHC.Driver.Main.Interactive * GHC.Driver.Main.Passes We might improve that separation further in the future but this should hopefully make it easier to reason about and work with this part of the code. - - - - - 14 changed files: - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Main.hs - + compiler/GHC/Driver/Main/Compile.hs - compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot - + compiler/GHC/Driver/Main/Hsc.hs - + compiler/GHC/Driver/Main/Interactive.hs - + compiler/GHC/Driver/Main/Passes.hs - + compiler/GHC/Driver/Main/Passes.hs-boot - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/Types/Error.hs - compiler/GHC/Types/Error.hs-boot - compiler/ghc.cabal.in The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/e545f25ce00d3aea1662bd24e4c4f39… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/e545f25ce00d3aea1662bd24e4c4f39… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc] Pushed new branch wip/int-index/ghc-10.0-from-9.16
by Vladislav Zavialov (＠int-index) 27 Apr '26

27 Apr '26

Vladislav Zavialov pushed new branch wip/int-index/ghc-10.0-from-9.16 at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/int-index/ghc-10.0-from-9.16 You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc] Pushed new branch wip/int-index/master-ghc-10.0-from-9.16
by Vladislav Zavialov (＠int-index) 27 Apr '26

27 Apr '26

Vladislav Zavialov pushed new branch wip/int-index/master-ghc-10.0-from-9.16 at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/int-index/master-ghc-10.0-fro… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc][wip/andreask/split-driver-main] Split GHC.Driver.Main.hs up into multiple components.
by Andreas Klebinger (＠AndreasK) 27 Apr '26

27 Apr '26

Andreas Klebinger pushed to branch wip/andreask/split-driver-main at Glasgow Haskell Compiler / GHC Commits: fe420572 by Andreas Klebinger at 2026-04-27T20:54:50+02:00 Split GHC.Driver.Main.hs up into multiple components. This commit splits GHC.Driver.Main into four components: * GHC.Driver.Main.Compile * GHC.Driver.Main.Hsc * GHC.Driver.Main.Interactive * GHC.Driver.Main.Passes We might improve that separation further in the future but this should hopefully make it easier to reason about and work with this part of the code. - - - - - 13 changed files: - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Main.hs - + compiler/GHC/Driver/Main/Compile.hs - compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot - + compiler/GHC/Driver/Main/Hsc.hs - + compiler/GHC/Driver/Main/Interactive.hs - + compiler/GHC/Driver/Main/Passes.hs - + compiler/GHC/Driver/Main/Passes.hs-boot - compiler/GHC/Iface/Load.hs - compiler/GHC/Types/Error.hs - compiler/GHC/Types/Error.hs-boot - compiler/ghc.cabal.in The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/fe4205728bc4492805c91f3f81405c8… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/fe4205728bc4492805c91f3f81405c8… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc][wip/andreask/split-driver-main] Split GHC.Driver.Main.hs up into multiple components.
by Andreas Klebinger (＠AndreasK) 27 Apr '26

27 Apr '26

Andreas Klebinger pushed to branch wip/andreask/split-driver-main at Glasgow Haskell Compiler / GHC Commits: 551e331b by Andreas Klebinger at 2026-04-27T20:48:23+02:00 Split GHC.Driver.Main.hs up into multiple components. This commit splits GHC.Driver.Main into four components: * GHC.Driver.Main.Compile * GHC.Driver.Main.Hsc * GHC.Driver.Main.Interactive * GHC.Driver.Main.Passes We might improve that separation further in the future but this should hopefully make it easier to reason about and work with this part of the code. - - - - - 13 changed files: - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Main.hs - + compiler/GHC/Driver/Main/Compile.hs - compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot - + compiler/GHC/Driver/Main/Hsc.hs - + compiler/GHC/Driver/Main/Interactive.hs - + compiler/GHC/Driver/Main/Passes.hs - + compiler/GHC/Driver/Main/Passes.hs-boot - compiler/GHC/Iface/Load.hs - compiler/GHC/Types/Error.hs - compiler/GHC/Types/Error.hs-boot - compiler/ghc.cabal.in The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/551e331b5386f80d7af2690bbd719fc… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/551e331b5386f80d7af2690bbd719fc… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc][wip/andreask/split-driver-main] 4 commits: Ensure TcM plugins are only initialised once
by Andreas Klebinger (＠AndreasK) 27 Apr '26

27 Apr '26

Andreas Klebinger pushed to branch wip/andreask/split-driver-main at Glasgow Haskell Compiler / GHC Commits: 1350271b by sheaf at 2026-04-27T09:32:53-04:00 Ensure TcM plugins are only initialised once This commit ensures we keep TcM plugins (typechecker plugins, defaulting plugins and hole fit plugins) running all the way through desugaring, instead of stopping them at the end of typechecking. To do this, the "stop" actions of TcPlugin and DefaultingPlugin are split into two: one for the "post-typecheck" action, and one for the final shutdown action (after desugaring). This allows the plugins to be invoked by the pattern match checker (during desugaring) without having to be repeatedly re-initialised and stopped, fixing #26839. In the process, this commit modifies 'initTc' and 'initTcInteractive', adding an extra argument that describes whether to start/stop the 'TcM' plugins. See Note [Stop TcM plugins after desugaring] for an overview. - - - - - 42549222 by sheaf at 2026-04-27T09:33:50-04:00 Hadrian: add --keep-response-files This commit adds a Hadrian flag that allows response files to be retained. This is useful for debugging a failing Hadrian command line. - - - - - 40564e8d by sheaf at 2026-04-27T09:34:46-04:00 hadrian/build-cabal.bat: fix build on Windows Commit 8cb99552f6 introduced a warning for a missing package index. However, the logic was faulty on Windows: the piping was broken, and "remote-repo-cache:" was being interpreted as a (malformed) drive letter, leading to the error: The filename, directory name, or volume label syntax is incorrect. This commit fixes that by using a temporary file instead of piping. - - - - - 504dd00a by Andreas Klebinger at 2026-04-27T20:45:13+02:00 Split GHC.Driver.Main.hs up into multiple components. This commit splits GHC.Driver.Main into four components: * GHC.Driver.Main.Compile * GHC.Driver.Main.Hsc * GHC.Driver.Main.Interactive * GHC.Driver.Main.Passes We might improve that separation further in the future but this should hopefully make it easier to reason about and work with this part of the code. - - - - - 75 changed files: - + changelog.d/hadrian-response-files.md - + changelog.d/tcplugin_init.md - + changelog.d/tcplugins-pmc.md - + changelog.d/typecheckModule-API.md - + changelog.d/withTcPlugins.md - compiler/GHC.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Main.hs - + compiler/GHC/Driver/Main/Compile.hs - compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot - + compiler/GHC/Driver/Main/Hsc.hs - + compiler/GHC/Driver/Main/Interactive.hs - + compiler/GHC/Driver/Main/Passes.hs - + compiler/GHC/Driver/Main/Passes.hs-boot - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Pipeline/Monad.hs - compiler/GHC/Driver/Pipeline/Phases.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Types.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Runtime/Heap/Inspect.hs - compiler/GHC/Runtime/Loader.hs - compiler/GHC/Tc/Errors/Hole.hs - compiler/GHC/Tc/Module.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Rewrite.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/Types.hs - compiler/GHC/Tc/Utils/Backpack.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Types/Error.hs - compiler/GHC/Types/Error.hs-boot - compiler/ghc.cabal.in - docs/users_guide/extending_ghc.rst - ghc/GHCi/UI/Info.hs - hadrian/build-cabal.bat - hadrian/src/Builder.hs - hadrian/src/CommandLine.hs - hadrian/src/Hadrian/Builder/Ar.hs - hadrian/src/Hadrian/Utilities.hs - testsuite/tests/ghc-api/T26910.hs - testsuite/tests/ghc-api/T6145.hs - testsuite/tests/ghci/should_run/tc-plugin-ghci/TcPluginGHCi.hs - testsuite/tests/plugins/defaulting-plugin/DefaultInterference.hs - testsuite/tests/plugins/defaulting-plugin/DefaultInvalid.hs - testsuite/tests/plugins/defaulting-plugin/DefaultLifted.hs - testsuite/tests/plugins/defaulting-plugin/DefaultMultiParam.hs - testsuite/tests/plugins/echo-plugin/Echo.hs - testsuite/tests/quasiquotation/T7918.hs - testsuite/tests/tcplugins/Common.hs - testsuite/tests/tcplugins/RewritePerfPlugin.hs - testsuite/tests/tcplugins/T11462_Plugin.hs - testsuite/tests/tcplugins/T11525_Plugin.hs - testsuite/tests/tcplugins/T26395_Plugin.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.script - + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.stderr - + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.stdout - + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.hs-boot - + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.stderr - + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode_aux.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_Warn.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_Warn.stderr - testsuite/tests/tcplugins/all.T - + testsuite/tests/tcplugins/tc-plugin-initstop/Makefile - + testsuite/tests/tcplugins/tc-plugin-initstop/Setup.hs - + testsuite/tests/tcplugins/tc-plugin-initstop/TcPlugin_InitStop_Plugin.hs - + testsuite/tests/tcplugins/tc-plugin-initstop/tc-plugin-initstop.cabal - testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs - utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/3334f29f38b6648a8d8548b599333b… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/3334f29f38b6648a8d8548b599333b… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc][wip/andreask/split-driver-main] 10 commits: Revert use of generic instances for compiler time perf reasons.
by Andreas Klebinger (＠AndreasK) 27 Apr '26

27 Apr '26

Andreas Klebinger pushed to branch wip/andreask/split-driver-main at Glasgow Haskell Compiler / GHC Commits: 86a646a6 by Andreas Klebinger at 2026-04-22T13:00:05-04:00 Revert use of generic instances for compiler time perf reasons. Revert "Derive Semigroup/Monoid for instances believed could be derived in #25871" This reverts commit 11a04cbb221cc404fe00d65d7c951558ede4caa9. Revert "add Ghc.Data.Pair deriving" This reverts commit 15d9ce449e1be8c01b89fd39bdf1e700ea7d1dce. - - - - - bc9ee1cf by Wen Kokke at 2026-04-22T13:00:51-04:00 hadrian: Fix docs to remove static flavour In 638f6548, the static flavour was turned into into the fully_static flavour transformer. However, this commit did not update flavours.md. - - - - - cc9cc6d5 by Cheng Shao at 2026-04-23T09:40:46+00:00 configure: bump LlvmMaxVersion to 23 This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases. - - - - - 2ea7ef8e by Cheng Shao at 2026-04-23T09:46:26+00:00 changelog: add llvm 22.x support - - - - - 5574ee10 by Cheng Shao at 2026-04-24T08:24:30-04:00 compiler: avoid unused temporary `appendFS` operands This patch fixes unused temporary `appendFS` operands in the codebase that are retained in the `FastString` table after concatenation. Rewrite rules are added so that if an operand is `fsLit`/`mkFastString`, the `appendFS` application is rewritten to append the `ShortByteString` operands first. The patch also fixes `sconcat` behavior to align with `mconcat` for the same reason. Fixes #27205. - - - - - 4ed78760 by mangoiv at 2026-04-24T08:25:13-04:00 contributing: adjust MR template to be less verbose - MR template only shows text that is relevant for submissiong - MR template was rewritten so it's readable from a user's and reviewer's perspective Resolves #27165 Co-Authored-By: @sheaf - - - - - 87db83e2 by Cheng Shao at 2026-04-24T14:37:21-04:00 ci: bump freebsd boot ghc to 9.10.3 This commit bumps freebsd boot ghc to 9.10.3 to align with other platforms and prevent outdated boot libs in boot ghc to block the freebsd job. - - - - - 17e3a0b7 by Cheng Shao at 2026-04-24T14:37:21-04:00 compiler: improve Binary instance of Array This patch improves the `Binary` instance of `Array`: - We no longer allocate intermediate lists. When serializing an `Array`, we iterate over the elements directly; when deserializing it, we allocate the result `Array` and fill it in a loop. - Now we only serialize the array bounds tuple; the length field is not needed. Closes #27109. - - - - - 2d30f7d3 by sheaf at 2026-04-24T14:38:23-04:00 Vendor mini-QuickCheck for testsuite This commit extracts the vendored QuickCheck implementation from the foundation testsuite to make it more broadly available in the GHC testsuite, and makes use of it in the simd006 test (which also used a vendored QuickCheck implementation). On the way, we update the linear congruential generator to avoid the shortcoming of only generating 31 bit large numbers. Fixes #25990 and #25969. - - - - - 3334f29f by Andreas Klebinger at 2026-04-27T20:30:52+02:00 Split GHC.Driver.Main.hs up into multiple components. This commit splits GHC.Driver.Main into four components: * GHC.Driver.Main.Compile * GHC.Driver.Main.Hsc * GHC.Driver.Main.Interactive * GHC.Driver.Main.Passes We might improve that separation further in the future but this should hopefully make it easier to reason about and work with this part of the code. - - - - - 38 changed files: - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/merge_request_templates/Default.md - + changelog.d/binary-array-no-list - + changelog.d/llvm-22 - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/Data/FastString.hs - compiler/GHC/Data/Pair.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Main.hs - + compiler/GHC/Driver/Main/Compile.hs - compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot - + compiler/GHC/Driver/Main/Hsc.hs - + compiler/GHC/Driver/Main/Interactive.hs - + compiler/GHC/Driver/Main/Passes.hs - + compiler/GHC/Driver/Main/Passes.hs-boot - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore/Pmc.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Types/Error.hs - compiler/GHC/Types/Error.hs-boot - compiler/GHC/Types/Unique/DSet.hs - compiler/GHC/Utils/Binary.hs - compiler/GHC/Utils/Ppr/Colour.hs - compiler/ghc.cabal.in - configure.ac - hadrian/doc/flavours.md - testsuite/driver/testlib.py - + testsuite/tests/MiniQuickCheck.hs - testsuite/tests/numeric/should_run/all.T - testsuite/tests/numeric/should_run/foundation.hs - testsuite/tests/simd/should_run/all.T - testsuite/tests/simd/should_run/simd006.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9db3561149bb46f4b898b9e8a9e5d1… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9db3561149bb46f4b898b9e8a9e5d1… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc][wip/jeltsch/more-efficient-home-unit-imports-finding] Make the `mg_complete_units` field strict
by Wolfgang Jeltsch (＠jeltsch) 27 Apr '26

27 Apr '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/more-efficient-home-unit-imports-finding at Glasgow Haskell Compiler / GHC Commits: 48eb7156 by Wolfgang Jeltsch at 2026-04-27T20:29:33+03:00 Make the `mg_complete_units` field strict - - - - - 1 changed file: - compiler/GHC/Unit/Module/Graph.hs Changes: ===================================== compiler/GHC/Unit/Module/Graph.hs ===================================== @@ -205,7 +205,7 @@ data ModuleGraph = ModuleGraph -- Cached computation, whether any of the ModuleGraphNode are isHoleModule, -- This is only used for a hack in GHC.Iface.Load to do with backpack, please -- remove this at the earliest opportunity. - , mg_complete_units :: CompleteUnits + , mg_complete_units :: !CompleteUnits -- ^ For each module name, which home unit UnitIds define it together with the set of units for which the listing is complete. } View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/48eb7156920d3a5b6ce2fd7ea8be3c6… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/48eb7156920d3a5b6ce2fd7ea8be3c6… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc][wip/27162/hadrian-linkhs-response-file] 23 commits: Migrate `ghc-pkg` to use `OsPath` and `file-io`
by David Eichmann (＠DavidEichmann) 27 Apr '26

27 Apr '26

David Eichmann pushed to branch wip/27162/hadrian-linkhs-response-file at Glasgow Haskell Compiler / GHC Commits: 7666f4a9 by Fendor at 2026-04-17T22:29:51-04:00 Migrate `ghc-pkg` to use `OsPath` and `file-io` `ghc-pkg` should use UNC paths as much as possible to avoid MAX_PATH issues on windows. `file-io` uses UNC Paths by default on windows, ensuring we use the correct APIs and that we finally are no longer plagued by MAX_PATH issues in CI and private machines. On top of it, the higher correctness of `OsPath` is appreciated in this small codebase. Also, we improve memory usage very slightly, due to the more efficient memory representation of `OsPath` over `FilePath` Adds `ghc-pkg` regression test for MAX_PATH on windows Make sure `ghc-pkg` behaves as expected when long paths (> 255) are involved on windows. Let's generate a testcase where we can actually observe that `ghc-pkg` behaves as epxected. See the documentation for windows on Maximum Path Length Limitation: * `https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation` Adds changelog entry for long path support in ghc-pkg. - - - - - 78434e8c by Simon Peyton Jones at 2026-04-17T22:30:38-04:00 Kill off the substitution in Lint Now that we have invariant (NoTypeShadowing) we no longer need Lint to carry an ambient substitution. This makes it simpler and faster. A really worthwhile refactor. There are some knock-on effects * Linting join points after worker/wrapper. See Note [Join points and beta redexes] * Running a type substitution after the desugarer. See Note [Substituting type-lets] in the new module GHC.Core.SubstTypeLets Implements #27078 Most perf tests don't use Lint so we won't see a perf incresae. But T1969, which uses -O0 and Lint, gets 1.3% worse because it has to run the SubstTypeLets pass which is a somewhat expensive no-op Overall though compile-time allocations are down 0.1%. Metric Increase: T1969 - - - - - 86ca6c2c by mangoiv at 2026-04-17T22:31:22-04:00 testsuite: inline elemCoreTest Some weird (probably python scoping) rule caused elemCoreTest, a regex being out of scope on ubuntu, presumably because of a newer python version. This patch just inlines the regex, which fixes the issue. Fixes #27193 - - - - - 72d6dc74 by aparker at 2026-04-20T20:15:44-04:00 NCG: Implement constant folding for vector simd ops (Issue #25030) - - - - - b9cab907 by sheaf at 2026-04-20T20:15:44-04:00 Mark some SIMD tests as broken on i386 optllvm As seen in #25498, several SIMD tests are broken on i386 in the optllvm way. This commit marks them as "expect_broken". - - - - - 76528cc3 by Wolfgang Jeltsch at 2026-04-20T20:16:25-04:00 Move most of the `System.IO` implementation into `base` This involves a rewrite of the `combine` helper function to avoid the use of `last`, which would now be flagged as an error. Metric Decrease: LinkableUsage01 T3294 Metric Increase: T12227 T12707 T5642 - - - - - 04d143c0 by Luite Stegeman at 2026-04-21T14:05:33-04:00 rts: add a few missing i386 relocations in the rts linker - - - - - 014087e7 by Luite Stegeman at 2026-04-21T14:05:34-04:00 CodeOutput: Fix finalizers on multiple platforms - ELF platforms: emit .fini_array section - wasm32/Darwin: emit initializer with __cxa_atexit call - Windows: use -Wl,--whole-archive to prevent dropping finalizer symbols - rts linker: fix crash/assertion failure unloading objects with finalizers fixes #27072 - - - - - 915bba6f by Simon Jakobi at 2026-04-21T14:06:16-04:00 Add regression test for #10531 Closes #10531. - - - - - 86a646a6 by Andreas Klebinger at 2026-04-22T13:00:05-04:00 Revert use of generic instances for compiler time perf reasons. Revert "Derive Semigroup/Monoid for instances believed could be derived in #25871" This reverts commit 11a04cbb221cc404fe00d65d7c951558ede4caa9. Revert "add Ghc.Data.Pair deriving" This reverts commit 15d9ce449e1be8c01b89fd39bdf1e700ea7d1dce. - - - - - bc9ee1cf by Wen Kokke at 2026-04-22T13:00:51-04:00 hadrian: Fix docs to remove static flavour In 638f6548, the static flavour was turned into into the fully_static flavour transformer. However, this commit did not update flavours.md. - - - - - cc9cc6d5 by Cheng Shao at 2026-04-23T09:40:46+00:00 configure: bump LlvmMaxVersion to 23 This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases. - - - - - 2ea7ef8e by Cheng Shao at 2026-04-23T09:46:26+00:00 changelog: add llvm 22.x support - - - - - 5574ee10 by Cheng Shao at 2026-04-24T08:24:30-04:00 compiler: avoid unused temporary `appendFS` operands This patch fixes unused temporary `appendFS` operands in the codebase that are retained in the `FastString` table after concatenation. Rewrite rules are added so that if an operand is `fsLit`/`mkFastString`, the `appendFS` application is rewritten to append the `ShortByteString` operands first. The patch also fixes `sconcat` behavior to align with `mconcat` for the same reason. Fixes #27205. - - - - - 4ed78760 by mangoiv at 2026-04-24T08:25:13-04:00 contributing: adjust MR template to be less verbose - MR template only shows text that is relevant for submissiong - MR template was rewritten so it's readable from a user's and reviewer's perspective Resolves #27165 Co-Authored-By: @sheaf - - - - - 87db83e2 by Cheng Shao at 2026-04-24T14:37:21-04:00 ci: bump freebsd boot ghc to 9.10.3 This commit bumps freebsd boot ghc to 9.10.3 to align with other platforms and prevent outdated boot libs in boot ghc to block the freebsd job. - - - - - 17e3a0b7 by Cheng Shao at 2026-04-24T14:37:21-04:00 compiler: improve Binary instance of Array This patch improves the `Binary` instance of `Array`: - We no longer allocate intermediate lists. When serializing an `Array`, we iterate over the elements directly; when deserializing it, we allocate the result `Array` and fill it in a loop. - Now we only serialize the array bounds tuple; the length field is not needed. Closes #27109. - - - - - 2d30f7d3 by sheaf at 2026-04-24T14:38:23-04:00 Vendor mini-QuickCheck for testsuite This commit extracts the vendored QuickCheck implementation from the foundation testsuite to make it more broadly available in the GHC testsuite, and makes use of it in the simd006 test (which also used a vendored QuickCheck implementation). On the way, we update the linear congruential generator to avoid the shortcoming of only generating 31 bit large numbers. Fixes #25990 and #25969. - - - - - 1350271b by sheaf at 2026-04-27T09:32:53-04:00 Ensure TcM plugins are only initialised once This commit ensures we keep TcM plugins (typechecker plugins, defaulting plugins and hole fit plugins) running all the way through desugaring, instead of stopping them at the end of typechecking. To do this, the "stop" actions of TcPlugin and DefaultingPlugin are split into two: one for the "post-typecheck" action, and one for the final shutdown action (after desugaring). This allows the plugins to be invoked by the pattern match checker (during desugaring) without having to be repeatedly re-initialised and stopped, fixing #26839. In the process, this commit modifies 'initTc' and 'initTcInteractive', adding an extra argument that describes whether to start/stop the 'TcM' plugins. See Note [Stop TcM plugins after desugaring] for an overview. - - - - - 42549222 by sheaf at 2026-04-27T09:33:50-04:00 Hadrian: add --keep-response-files This commit adds a Hadrian flag that allows response files to be retained. This is useful for debugging a failing Hadrian command line. - - - - - 40564e8d by sheaf at 2026-04-27T09:34:46-04:00 hadrian/build-cabal.bat: fix build on Windows Commit 8cb99552f6 introduced a warning for a missing package index. However, the logic was faulty on Windows: the piping was broken, and "remote-repo-cache:" was being interpreted as a (malformed) drive letter, leading to the error: The filename, directory name, or volume label syntax is incorrect. This commit fixes that by using a temporary file instead of piping. - - - - - d93a5bd8 by David Eichmann at 2026-04-27T16:03:57+01:00 Hadrian: withResponseFile outputs response file when verbodity is Verbose At the Verbose verbosity, shake will display full commandlines. With the use of response files, the full command is hidden. That makes it hard to run the command manually. This commit outputs the contents of the response file so that that full command can be recreated and also hints at the use of the --keep-response-files hadrian flag. - - - - - 7fd6dc18 by Duncan Coutts at 2026-04-27T16:03:57+01:00 Use response files for hadrian linking with ghc (support long command lines) In future support for windows dynamic linking, we expect long command lines for linking dll files with ghc. Experiments with dynamic linking the ghc-internal library yielded a link command well over 32kb. We did not encounter this before for static libs, since we already use ar's @file feature (if available, which it is for the llvm toolchain). Co-authored-by: David Eichmann <davide(a)well-typed.com> - - - - - 169 changed files: - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/merge_request_templates/Default.md - + changelog.d/binary-array-no-list - + changelog.d/fix-finalizers-27072 - + changelog.d/ghc-pkg-long-path-support - + changelog.d/hadrian-response-files.md - + changelog.d/llvm-22 - + changelog.d/simd_constant_folding - + changelog.d/tcplugin_init.md - + changelog.d/tcplugins-pmc.md - + changelog.d/typecheckModule-API.md - + changelog.d/withTcPlugins.md - compiler/GHC.hs - compiler/GHC/Cmm/Opt.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/Core/Lint.hs - + compiler/GHC/Core/Lint/SubstTypeLets.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Data/FastString.hs - compiler/GHC/Data/Pair.hs - compiler/GHC/Driver/CodeOutput.hs - compiler/GHC/Driver/Config/Core/Lint.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Pipeline/Monad.hs - compiler/GHC/Driver/Pipeline/Phases.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Pmc.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/HsToCore/Types.hs - compiler/GHC/Linker/Executable.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Runtime/Heap/Inspect.hs - compiler/GHC/Runtime/Loader.hs - compiler/GHC/Tc/Errors/Hole.hs - compiler/GHC/Tc/Module.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Rewrite.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/Types.hs - compiler/GHC/Tc/Utils/Backpack.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Types/ForeignStubs.hs - compiler/GHC/Types/Unique/DSet.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Utils/Binary.hs - compiler/GHC/Utils/Misc.hs - compiler/GHC/Utils/Ppr/Colour.hs - compiler/ghc.cabal.in - configure.ac - docs/users_guide/extending_ghc.rst - ghc/GHCi/UI/Info.hs - hadrian/build-cabal.bat - hadrian/doc/flavours.md - hadrian/src/Builder.hs - hadrian/src/CommandLine.hs - hadrian/src/Hadrian/Builder.hs - hadrian/src/Hadrian/Builder/Ar.hs - hadrian/src/Hadrian/Utilities.hs - hadrian/src/Settings/Builders/Ghc.hs - libraries/base/src/Control/Concurrent.hs - libraries/base/src/GHC/IO/Handle.hs - libraries/base/src/Prelude.hs - libraries/base/src/System/IO.hs - libraries/base/src/Text/Printf.hs - libraries/base/tests/perf/all.T - libraries/ghc-boot/GHC/Unit/Database.hs - libraries/ghc-boot/ghc-boot.cabal.in - libraries/ghc-internal/src/GHC/Internal/System/IO.hs - rts/Linker.c - rts/LinkerInternals.h - rts/linker/Elf.c - testsuite/driver/testlib.py - + testsuite/tests/MiniQuickCheck.hs - testsuite/tests/cabal/Makefile - testsuite/tests/cabal/all.T - + testsuite/tests/cabal/ghcpkg10.stdout - + testsuite/tests/codeGen/should_run/T27072d.hs - + testsuite/tests/codeGen/should_run/T27072d.stdout - + testsuite/tests/codeGen/should_run/T27072d_c.c - + testsuite/tests/codeGen/should_run/T27072d_check.c - + testsuite/tests/codeGen/should_run/T27072w.hs - + testsuite/tests/codeGen/should_run/T27072w.stdout - + testsuite/tests/codeGen/should_run/T27072w_c.c - testsuite/tests/codeGen/should_run/all.T - testsuite/tests/corelint/LintEtaExpand.stderr - testsuite/tests/corelint/T21115b.stderr - + testsuite/tests/driver/T10531/A.hs - + testsuite/tests/driver/T10531/B.hs - + testsuite/tests/driver/T10531/C.hs - + testsuite/tests/driver/T10531/Makefile - + testsuite/tests/driver/T10531/all.T - testsuite/tests/ghc-api/T26910.hs - testsuite/tests/ghc-api/T6145.hs - testsuite/tests/ghci/should_run/tc-plugin-ghci/TcPluginGHCi.hs - testsuite/tests/interface-stability/base-exports.stdout - testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs - testsuite/tests/interface-stability/base-exports.stdout-mingw32 - testsuite/tests/interface-stability/base-exports.stdout-ws-32 - testsuite/tests/numeric/should_run/all.T - testsuite/tests/numeric/should_run/foundation.hs - testsuite/tests/plugins/defaulting-plugin/DefaultInterference.hs - testsuite/tests/plugins/defaulting-plugin/DefaultInvalid.hs - testsuite/tests/plugins/defaulting-plugin/DefaultLifted.hs - testsuite/tests/plugins/defaulting-plugin/DefaultMultiParam.hs - testsuite/tests/plugins/echo-plugin/Echo.hs - testsuite/tests/quasiquotation/T7918.hs - + testsuite/tests/rts/linker/T27072/Lib.c - + testsuite/tests/rts/linker/T27072/Makefile - + testsuite/tests/rts/linker/T27072/T27072.stdout - + testsuite/tests/rts/linker/T27072/all.T - + testsuite/tests/rts/linker/T27072/main.c - + testsuite/tests/simd/should_run/Makefile - + testsuite/tests/simd/should_run/T25030.hs - + testsuite/tests/simd/should_run/T25030.stdout - testsuite/tests/simd/should_run/all.T - testsuite/tests/simd/should_run/simd006.hs - testsuite/tests/tcplugins/Common.hs - testsuite/tests/tcplugins/RewritePerfPlugin.hs - testsuite/tests/tcplugins/T11462_Plugin.hs - testsuite/tests/tcplugins/T11525_Plugin.hs - testsuite/tests/tcplugins/T26395_Plugin.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.script - + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.stderr - + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.stdout - + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.hs-boot - + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.stderr - + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode_aux.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_Warn.hs - + testsuite/tests/tcplugins/TcPlugin_InitStop_Warn.stderr - testsuite/tests/tcplugins/all.T - + testsuite/tests/tcplugins/tc-plugin-initstop/Makefile - + testsuite/tests/tcplugins/tc-plugin-initstop/Setup.hs - + testsuite/tests/tcplugins/tc-plugin-initstop/TcPlugin_InitStop_Plugin.hs - + testsuite/tests/tcplugins/tc-plugin-initstop/tc-plugin-initstop.cabal - testsuite/tests/th/all.T - testsuite/tests/typecheck/should_compile/T9497a.stderr - testsuite/tests/typecheck/should_compile/holes.stderr - testsuite/tests/typecheck/should_compile/holes3.stderr - testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr - testsuite/tests/typecheck/should_fail/T9497d.stderr - testsuite/tests/typecheck/should_run/T9497a-run.stderr - testsuite/tests/typecheck/should_run/T9497b-run.stderr - testsuite/tests/typecheck/should_run/T9497c-run.stderr - testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs - utils/ghc-pkg/Main.hs - utils/ghc-pkg/ghc-pkg.cabal.in - utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs - utils/haddock/html-test/ref/Bug1004.html - utils/haddock/html-test/ref/Bug973.html - utils/haddock/html-test/ref/ConstructorPatternExport.html - utils/haddock/html-test/ref/DefaultSignatures.html - utils/haddock/html-test/ref/Hash.html - utils/haddock/html-test/ref/PatternSyns.html - utils/haddock/html-test/ref/PatternSyns2.html - utils/haddock/html-test/ref/QuasiExpr.html - utils/haddock/html-test/ref/Test.html The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d390a264f232a9a690da99d7e23c07… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d390a264f232a9a690da99d7e23c07… You're receiving this email because of your account on gitlab.haskell.org.

1 0