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[Git][ghc/ghc][wip/jeltsch/textual-bytecode-output] 15 commits: hie.yaml: use a polyglot shell/batch script
by Wolfgang Jeltsch (＠jeltsch) 14 Aug '26

14 Aug '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/textual-bytecode-output at Glasgow Haskell Compiler / GHC Commits: 9df24b7e by sheaf at 2026-08-10T14:28:30-04:00 hie.yaml: use a polyglot shell/batch script This commit merges hie-bios and hie-bios.bat into a single polyglot script. This avoids Windows users having to manually update hie.yaml in order to be able to use HLS. - - - - - 7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00 EPA: Remove type parameter from AnnList This is a step towards cutting AnnList down to its core for formatting lists only - - - - - e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00 driver: Link object files in a deterministic order The object files handed to the linker come from the HomePackageTable, which is ordered by the order in which modules finished compiling. With -j1 that is the build plan order, with -jN it is whatever the scheduler produced, so the same sources can link to different (but equivalent) binaries. The order reaches the output: .text and .rodata contributions are concatenated in link order, so e.g. building the hdav executable of the DAV package twice, once with -j1 and once with -j4, yields two binaries that differ in ~100kB of section contents. Sort the home modules by module before collecting their linkables, guarded under `Opt_ObjectDeterminism` . Fixes #27612 Signed-off-by: Bernhard M. Wiedemann <bwiedemann(a)suse.de> - - - - - 556db2f3 by sheaf at 2026-08-10T21:32:06-04:00 Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite As remarked in #27628, this module currently sits on a knife's edge: if the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then SpecConstr suddenly kicks in and causes disastrous reboxing of the LiftingContext argument. To make this less likely to happen, this commit lowers the SpecConstr threshold. - - - - - c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00 Major patch to re-engineer known-key names This big patch implements the New Plan for known-key names, described in #27013. Read the big Note [Overview of known-key names] in GHC.Types.Name Some things had to be reworked slightly to accomodate the new known-keys design. A significant one was the generation of auxiliary KindRep bindings, which was greatly simplified. Note [Grand plan for Typeable] was updated accordingly. Another example: GHC.Internal.CString was merged into GHC.Internal.Types. Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita(a)gmail.com> The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed Metrics: compile_time/bytes allocated ------------------------------------- Baseline Test Metric value New value Change ------------------------------------------------------------------------------------------ MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD geo. mean +0.1% minimum -8.0% maximum +5.4% All performance regressions were investigated in depth. The surviving ones: - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 - T13820, T18140, T10547, T13035 regress because we load an additional interface and associated Names for GHC.Essentials. ------------------------- Metric Decrease: MultiLayerModules T13379 T13701 T14697 T26989 T4801 T783 T9961 hard_hole_fits mhu-perf size_hello_artifact size_hello_obj size_hello_unicode Metric Increase: LinkableUsage01 LinkableUsage02 MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 T10547 T13035 T13820 T18140 T18698a T18698b T20049 ------------------------- Bumps submodule binary Closes #27013 - - - - - 61665e79 by sheaf at 2026-08-14T01:09:33+02:00 Allow GHC.Essentials to be hidden This commit overhauls several aspects of the known entity handling, in order to allow GHC.Essentials to be hidden without a proliferation of special cases in the compiler. The main contribution is to introduce the 'UnresolvedImport' datatype which cleans up a lot of ad-hoc handling relating to 'ModSummary', fixing #27603. This allows us to reduce duplication, e.g. by having Backpack reuse 'mkUnresolvedImports' instead of replicating the "add implicit imports" logic. It also makes it easier to avoid undesirable edge cases (such as making sure that the Template Haskell 'reifyModule' function does not leak the implicit GHC.Essentials import). In particular, the infamous 'findImportedModuleWithIsBoot' is now simply 'resolveImport', taking a single 'UnresolvedImport' and resolving it to a 'FindResult' (usually a 'Module'). Other changes: - Cache the result of looking up GHC.Essentials (in TcM and DsM environments) to avoid redundant work. This reduces allocations on LinkableUsage01 and hard_hole_fits. - Properly look up known entities for StaticPointers like we do for other known entities everywhere else. This allows e.g. modules in ghc-internal to use -XStaticPointers. - When using multiple home units, we are now careful to handle the situation in which we may have multiple GHC.Essentials modules around. See the new tests under 'driver/multipleHomeUnits'. - - - - - b19fcc1c by Vladislav Zavialov at 2026-08-14T06:26:11-04:00 Increase test coverage of diagnostics, batch 2 Add test cases for the previously untested diagnostics: [GHC-26133] TcRnForeignImportPrimSafeAnn [GHC-68444] SumAltArityExceeded [GHC-63966] IllegalSumAlt [GHC-23882] IllegalDeclaration [GHC-60220] InvalidCCallImpent [GHC-18816] RecGadtNoCons [GHC-38140] GadtNoCons [GHC-37056] InvalidTypeInstanceHeader [GHC-78486] InvalidTyFamInstLHS [GHC-39639] DefaultDataInstDecl [GHC-78822] AssocDefaultNotAssoc [GHC-43510] NotSimpleUnliftedType [GHC-41843] IOResultExpected [GHC-07641] AtLeastOneArgExpected [GHC-52886] InvalidTopDecl Remove unused error constructors: [GHC-92057] ImportLookupAmbiguous - - - - - 7b27f25a by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Drop peak_megabytes_allocated from LinkableUsage tests LinkableUsage01/02 collected all metrics with a 2% tolerance. For peak_megabytes_allocated, whose granularity is 1 MB, that window is under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the test (#27613, #27489). Drop that metric: max_bytes_used guards the Linkable-retention property with byte granularity, at a tolerance that still comfortably exceeds the noise observed in CI. Assisted-by: Claude Fable 5 - - - - - e5de423b by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Don't truncate fractional baselines when computing bounds RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with int() before applying the tolerance. Baselines can be fractional (they are averaged over several measurements), so this skewed the acceptance window downwards: in #27613, a baseline of 33.67 at 2% tolerance yielded bounds (32, 34) instead of (32, 35), rejecting a measurement that was within tolerance. Assisted-by: Claude Fable 5 - - - - - 0b1fa775 by Wolfgang Jeltsch at 2026-08-14T17:29:05+03:00 Add support for textual output of bytecode file content - - - - - 892 changed files: - + changelog.d/T20363 - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/link-deterministic-order - + changelog.d/refactor-known-names - + changelog.d/show-byte-code - compiler/GHC.hs - + compiler/GHC/Builtin.hs - + compiler/GHC/Builtin/KnownKeys.hs - + compiler/GHC/Builtin/KnownOccs.hs - + compiler/GHC/Builtin/Modules.hs - − compiler/GHC/Builtin/Names.hs - − compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/PrimOps/Casts.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - + compiler/GHC/Builtin/TH.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/Uniques.hs-boot - − compiler/GHC/Builtin/Utils.hs - + compiler/GHC/Builtin/WiredIn/Ids.hs - compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs - compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs - compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs - compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/ByteCode/Serialize.hs - + compiler/GHC/ByteCode/Show.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/LiberateCase.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/SpecConstr.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/CoreToStg.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Config/Tidy.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Env/KnotVars.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main/Hsc.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/MakeFile.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Plugins.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Dump.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/Hs/Lit.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Syn/Type.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Arrows.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Foreign/Call.hs - compiler/GHC/HsToCore/Foreign/JavaScript.hs - compiler/GHC/HsToCore/Foreign/Utils.hs - compiler/GHC/HsToCore/Foreign/Wasm.hs - compiler/GHC/HsToCore/ListComp.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Match/Constructor.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Pmc/Check.hs - compiler/GHC/HsToCore/Pmc/Desugar.hs - compiler/GHC/HsToCore/Pmc/Ppr.hs - compiler/GHC/HsToCore/Pmc/Solver.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Types.hs - compiler/GHC/HsToCore/Usage.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Iface/Binary.hs - compiler/GHC/Iface/Env.hs - − compiler/GHC/Iface/Env.hs-boot - compiler/GHC/Iface/Errors/Ppr.hs - compiler/GHC/Iface/Errors/Types.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Make.hs - compiler/GHC/Iface/Recomp.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/Errors/Ppr.hs - compiler/GHC/Parser/Header.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Plugins.hs - compiler/GHC/Rename/Env.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Lit.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/Rename/Unbound.hs - compiler/GHC/Rename/Utils.hs - compiler/GHC/Runtime/Context.hs - compiler/GHC/Runtime/Debugger.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Runtime/Heap/Inspect.hs - compiler/GHC/Runtime/Interpreter.hs - compiler/GHC/Runtime/Loader.hs - compiler/GHC/Stg/BcPrep.hs - compiler/GHC/Stg/Unarise.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm/Bind.hs - compiler/GHC/StgToCmm/DataCon.hs - compiler/GHC/StgToCmm/Env.hs - compiler/GHC/StgToCmm/Foreign.hs - compiler/GHC/StgToCmm/Lit.hs - compiler/GHC/StgToCmm/Ticky.hs - compiler/GHC/StgToJS/Apply.hs - compiler/GHC/StgToJS/Arg.hs - compiler/GHC/StgToJS/Expr.hs - compiler/GHC/StgToJS/FFI.hs - compiler/GHC/StgToJS/Linker/Utils.hs - compiler/GHC/StgToJS/Utils.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Deriv/Functor.hs - compiler/GHC/Tc/Deriv/Generate.hs - compiler/GHC/Tc/Deriv/Generics.hs - compiler/GHC/Tc/Deriv/Infer.hs - compiler/GHC/Tc/Deriv/Utils.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Hole.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Arrow.hs - 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compiler/GHC/Unit/External/Index.hs - compiler/GHC/Unit/External/ModuleOrigin.hs - compiler/GHC/Unit/External/Providers.hs - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/Finder/Types.hs - compiler/GHC/Unit/Module/Deps.hs - compiler/GHC/Unit/Module/ModSummary.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Unit/Types.hs - compiler/GHC/Utils/Binary.hs - − compiler/GHC/Utils/Binary/Typeable.hs - compiler/Language/Haskell/Syntax/Expr.hs - compiler/ghc.cabal.in - docs/index.html.in - docs/users_guide/ghc_config.py.in - docs/users_guide/separate_compilation.rst - docs/users_guide/using.rst - ghc/GHC/Driver/Session/Mode.hs - ghc/GHCi/UI.hs - ghc/GHCi/UI/Monad.hs - ghc/Main.hs - − hadrian/hie-bios - hadrian/hie-bios.bat - hadrian/src/Rules/Generate.hs - hie.yaml - libraries/base/base.cabal.in - libraries/base/src/Control/Applicative.hs - libraries/base/src/Control/Concurrent.hs - libraries/base/src/Control/Concurrent/Chan.hs - libraries/base/src/Control/Concurrent/QSem.hs - libraries/base/src/Control/Concurrent/QSemN.hs - libraries/base/src/Data/Array/Byte.hs - libraries/base/src/Data/Bifoldable.hs - libraries/base/src/Data/Bifoldable1.hs - libraries/base/src/Data/Bifunctor.hs - libraries/base/src/Data/Bitraversable.hs - libraries/base/src/Data/Bool.hs - libraries/base/src/Data/Complex.hs - libraries/base/src/Data/Data.hs - libraries/base/src/Data/Enum.hs - libraries/base/src/Data/Fixed.hs - libraries/base/src/Data/Foldable1.hs - libraries/base/src/Data/Functor/Classes.hs - libraries/base/src/Data/Functor/Compose.hs - libraries/base/src/Data/Functor/Contravariant.hs - libraries/base/src/Data/Functor/Product.hs - libraries/base/src/Data/Functor/Sum.hs - libraries/base/src/Data/List.hs - libraries/base/src/Data/List/NonEmpty.hs - libraries/base/src/Data/List/NubOrdSet.hs - libraries/base/src/Data/Semigroup.hs - libraries/base/src/Data/Version.hs - libraries/base/src/GHC/Base.hs - libraries/base/src/GHC/ByteOrder.hs - + libraries/base/src/GHC/Essentials.hs - libraries/base/src/GHC/Exts.hs - libraries/base/src/GHC/Fingerprint.hs - 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[Git][ghc/ghc][wip/jeltsch/stm-exception-improvements] 11 commits: Allow rewriting in RuntimeReps for newtype ConPats
by Wolfgang Jeltsch (＠jeltsch) 14 Aug '26

14 Aug '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/stm-exception-improvements at Glasgow Haskell Compiler / GHC Commits: c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00 Major patch to re-engineer known-key names This big patch implements the New Plan for known-key names, described in #27013. Read the big Note [Overview of known-key names] in GHC.Types.Name Some things had to be reworked slightly to accomodate the new known-keys design. A significant one was the generation of auxiliary KindRep bindings, which was greatly simplified. Note [Grand plan for Typeable] was updated accordingly. Another example: GHC.Internal.CString was merged into GHC.Internal.Types. Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita(a)gmail.com> The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed Metrics: compile_time/bytes allocated ------------------------------------- Baseline Test Metric value New value Change ------------------------------------------------------------------------------------------ MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD geo. mean +0.1% minimum -8.0% maximum +5.4% All performance regressions were investigated in depth. The surviving ones: - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 - T13820, T18140, T10547, T13035 regress because we load an additional interface and associated Names for GHC.Essentials. ------------------------- Metric Decrease: MultiLayerModules T13379 T13701 T14697 T26989 T4801 T783 T9961 hard_hole_fits mhu-perf size_hello_artifact size_hello_obj size_hello_unicode Metric Increase: LinkableUsage01 LinkableUsage02 MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 T10547 T13035 T13820 T18140 T18698a T18698b T20049 ------------------------- Bumps submodule binary Closes #27013 - - - - - 61665e79 by sheaf at 2026-08-14T01:09:33+02:00 Allow GHC.Essentials to be hidden This commit overhauls several aspects of the known entity handling, in order to allow GHC.Essentials to be hidden without a proliferation of special cases in the compiler. The main contribution is to introduce the 'UnresolvedImport' datatype which cleans up a lot of ad-hoc handling relating to 'ModSummary', fixing #27603. This allows us to reduce duplication, e.g. by having Backpack reuse 'mkUnresolvedImports' instead of replicating the "add implicit imports" logic. It also makes it easier to avoid undesirable edge cases (such as making sure that the Template Haskell 'reifyModule' function does not leak the implicit GHC.Essentials import). In particular, the infamous 'findImportedModuleWithIsBoot' is now simply 'resolveImport', taking a single 'UnresolvedImport' and resolving it to a 'FindResult' (usually a 'Module'). Other changes: - Cache the result of looking up GHC.Essentials (in TcM and DsM environments) to avoid redundant work. This reduces allocations on LinkableUsage01 and hard_hole_fits. - Properly look up known entities for StaticPointers like we do for other known entities everywhere else. This allows e.g. modules in ghc-internal to use -XStaticPointers. - When using multiple home units, we are now careful to handle the situation in which we may have multiple GHC.Essentials modules around. See the new tests under 'driver/multipleHomeUnits'. - - - - - b19fcc1c by Vladislav Zavialov at 2026-08-14T06:26:11-04:00 Increase test coverage of diagnostics, batch 2 Add test cases for the previously untested diagnostics: [GHC-26133] TcRnForeignImportPrimSafeAnn [GHC-68444] SumAltArityExceeded [GHC-63966] IllegalSumAlt [GHC-23882] IllegalDeclaration [GHC-60220] InvalidCCallImpent [GHC-18816] RecGadtNoCons [GHC-38140] GadtNoCons [GHC-37056] InvalidTypeInstanceHeader [GHC-78486] InvalidTyFamInstLHS [GHC-39639] DefaultDataInstDecl [GHC-78822] AssocDefaultNotAssoc [GHC-43510] NotSimpleUnliftedType [GHC-41843] IOResultExpected [GHC-07641] AtLeastOneArgExpected [GHC-52886] InvalidTopDecl Remove unused error constructors: [GHC-92057] ImportLookupAmbiguous - - - - - 7b27f25a by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Drop peak_megabytes_allocated from LinkableUsage tests LinkableUsage01/02 collected all metrics with a 2% tolerance. For peak_megabytes_allocated, whose granularity is 1 MB, that window is under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the test (#27613, #27489). Drop that metric: max_bytes_used guards the Linkable-retention property with byte granularity, at a tolerance that still comfortably exceeds the noise observed in CI. Assisted-by: Claude Fable 5 - - - - - e5de423b by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Don't truncate fractional baselines when computing bounds RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with int() before applying the tolerance. Baselines can be fractional (they are averaged over several measurements), so this skewed the acceptance window downwards: in #27613, a baseline of 33.67 at 2% tolerance yielded bounds (32, 34) instead of (32, 35), rejecting a measurement that was within tolerance. Assisted-by: Claude Fable 5 - - - - - 268ec236 by Wolfgang Jeltsch at 2026-08-14T17:20:49+03:00 Add `rethrowSTM` and improve STM-related documentation Adding `rethrowSTM` resolves #26758. The implementation of `rethrowSTM` is completely analogous to the one of `rethrowIO`. The following is established for the documentation of `throwSTM` and `catchSTM`: * Both operations are directly described as analogs of their `IO` counterparts. * There is no reference to `throw` in the documentation of `throwSTM`, because, although such a reference is great in the documentation of `throwIO`, it is somewhat out of place in the documentation of `throwSTM`. * Instead of repeating part of `throwIO`’s documentation, the documentation of `throwSTM` just recommends using `throwSTM` instead of `throw` and references the corresponding arguments in the documentation of `throwIO`. - - - - - 863 changed files: - + changelog.d/T20363 - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/refactor-known-names - + changelog.d/rethrow-stm - compiler/GHC.hs - + compiler/GHC/Builtin.hs - + compiler/GHC/Builtin/KnownKeys.hs - + compiler/GHC/Builtin/KnownOccs.hs - + compiler/GHC/Builtin/Modules.hs - − compiler/GHC/Builtin/Names.hs - − compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps.hs - 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testsuite/tests/typecheck/should_fail/T14884.stderr - testsuite/tests/typecheck/should_fail/T15883b.stderr - testsuite/tests/typecheck/should_fail/T15883c.stderr - testsuite/tests/typecheck/should_fail/T15883d.stderr - testsuite/tests/typecheck/should_fail/T21130.stderr - testsuite/tests/typecheck/should_fail/T3323.stderr - testsuite/tests/typecheck/should_fail/T5095.stderr - testsuite/tests/typecheck/should_fail/T7279.stderr - testsuite/tests/typecheck/should_fail/TcStaticPointersFail02.stderr - testsuite/tests/typecheck/should_fail/TyAppPat_PatternBindingExistential.stderr - testsuite/tests/typecheck/should_fail/tcfail072.stderr - testsuite/tests/typecheck/should_fail/tcfail097.stderr - testsuite/tests/typecheck/should_fail/tcfail133.stderr - testsuite/tests/typecheck/should_run/T22510.stdout - testsuite/tests/unboxedsums/UbxSumLevPoly.hs - testsuite/tests/unboxedsums/unboxedsums_unit_tests.hs - testsuite/tests/warnings/should_compile/DerivingTypeable.stderr - utils/check-exact/Utils.hs - utils/genprimopcode/Main.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface.hs - utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs - utils/haddock/haddock-api/src/Haddock/Interface/Create.hs - utils/haddock/haddock-api/src/Haddock/Interface/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/3731b23a08216bbff8d7eadf8b3804… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/3731b23a08216bbff8d7eadf8b3804… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/mangoiv/27556] hadrian: set the executable bit for hie-bios.bat
by Magnus (＠MangoIV) 14 Aug '26

14 Aug '26

Magnus pushed to branch wip/mangoiv/27556 at Glasgow Haskell Compiler / GHC Commits: db0d64ae by mangoiv at 2026-08-14T16:14:03+02:00 hadrian: set the executable bit for hie-bios.bat - - - - - 1 changed file: - hadrian/hie-bios.bat Changes: ===================================== hadrian/hie-bios.bat ===================================== View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/db0d64ae93d0e4048658fdb64875ef5… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/db0d64ae93d0e4048658fdb64875ef5… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc] Pushed new branch wip/mangoiv/27556
by Magnus (＠MangoIV) 14 Aug '26

14 Aug '26

Magnus pushed new branch wip/mangoiv/27556 at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/mangoiv/27556 You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/romes/27514] 3 commits: fixup: Add mask_ to parent forkIOWithUnmask
by Rodrigo Mesquita (＠alt-romes) 14 Aug '26

14 Aug '26

Rodrigo Mesquita pushed to branch wip/romes/27514 at Glasgow Haskell Compiler / GHC Commits: 02b3b6ee by Rodrigo Mesquita at 2026-08-14T13:32:58+01:00 fixup: Add mask_ to parent forkIOWithUnmask - - - - - c65f7a6e by Rodrigo Mesquita at 2026-08-14T13:38:13+01:00 fixup: reduce transactions, put together sequentially together ones - - - - - b8695cd3 by Rodrigo Mesquita at 2026-08-14T13:56:58+01:00 fixup: keep track of worker threads - - - - - 2 changed files: - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/MakeAction.hs Changes: ===================================== compiler/GHC/Driver/Downsweep.hs ===================================== @@ -1787,9 +1787,10 @@ parDfsBuild base_map roots key expand = ReaderT $ \ds_env -> do visited_var <- newTVarIO (fromMaybe Map.empty base_map) pending <- newTVarIO Set.empty worklist <- newTQueueIO + threads <- newTVarIO [] coord_tid <- forkIO $ - coordinator ds_env exc_var visited_var worklist pending + coordinator ds_env exc_var visited_var worklist pending threads `MC.catch` \case (e::MC.SomeException) -- exit cleanly when killed @@ -1798,11 +1799,12 @@ parDfsBuild base_map roots key expand = ReaderT $ \ds_env -> do -- signal the exc_var for the main thread to throw it | otherwise -> atomically (modifyTVar' exc_var (<|> Just e)) - mapM_ (atomically . writeTQueue worklist) roots + atomically $ mapM_ (writeTQueue worklist) roots mb_exc <- wait_done exc_var worklist pending `MC.finally` do killThread coord_tid + mapM_ killThread =<< readTVarIO threads case mb_exc of Just e -> throwIO e @@ -1820,7 +1822,7 @@ parDfsBuild base_map roots key expand = ReaderT $ \ds_env -> do unless (empty_worklist && empty_pending) retry return Nothing - coordinator ds_env exc_var visvar worklist pendvar = forever $ do + coordinator ds_env exc_var visvar worklist pendvar threads = forever $ do mb_node_to_expand <- atomically $ do node <- readTQueue worklist let k = key node @@ -1839,27 +1841,32 @@ parDfsBuild base_map roots key expand = ReaderT $ \ds_env -> do case mb_node_to_expand of Nothing -> return () - Just (k, node) -> void $ do - withLocalTmpFSMake (ds_make_env ds_env) $ \make_env -> - forkIOWithUnmask $ \unmask -> + Just (k, node) -> do + tid <- withLocalTmpFSMake (ds_make_env ds_env) $ \make_env -> + MC.mask_ $ forkIOWithUnmask $ \unmask -> unmask (worker ds_env{ds_make_env = make_env} visvar worklist pendvar k node) - -- write exception in the worker to the main thread - `MC.catch` \(e::MC.SomeException) -> - atomically (modifyTVar' exc_var (<|> Just e)) + `MC.catch` \case + e | Just (_ :: SomeAsyncException) <- fromException e + -> throwIO e -- async exceptions like KillThread get thrown + | otherwise -- exceptions in workers are written for main thread + -> atomically (modifyTVar' exc_var (<|> Just e)) + + atomically $ modifyTVar' threads (tid:) worker ds_env@DownsweepEnv{..} visvar worklist pendvar k node = withAbstractSem (compile_sem ds_make_env) $ do r <- runDownsweepM ds_env $ expand node -- do the main work! - case r of - NSkip -> - atomically $ modifyTVar' visvar (Map.insert k NSkip) - NSuccess (v,ns) -> do - atomically $ modifyTVar' visvar (Map.insert k (NSuccess v)) - mapM_ (atomically . writeTQueue worklist) ns + atomically $ do + case r of + NSkip -> + modifyTVar' visvar (Map.insert k NSkip) + NSuccess (v,ns) -> do + modifyTVar' visvar (Map.insert k (NSuccess v)) + mapM_ (writeTQueue worklist) ns - atomically $ modifyTVar' pendvar (Set.delete k) + modifyTVar' pendvar (Set.delete k) {- Note [Downsweep Control Flow and Caching] ===================================== compiler/GHC/Driver/MakeAction.hs ===================================== @@ -185,7 +185,8 @@ runLoop fork_thread env (MakeAction act res_var :acts) = do -- withLocalTmpFs has to occur outside of fork to remain deterministic new_thread <- withLocalTmpFSMake env $ \lcl_env -> - fork_thread $ \unmask -> (do + MC.mask_ $ + fork_thread $ \unmask -> (do mres <- (unmask $ run_pipeline lcl_env act) `MC.onException` (putMVar res_var Nothing) -- Defensive: If there's an unhandled exception then still signal the failure. putMVar res_var mres) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d333bb06f7fd6603543ada4bf39916… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d333bb06f7fd6603543ada4bf39916… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc] Pushed new branch wip/T27627
by Simon Peyton Jones (＠simonpj) 14 Aug '26

14 Aug '26

Simon Peyton Jones pushed new branch wip/T27627 at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/T27627 You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/mangoiv/ci-stages] fix: don't do msys deps check on stage1 compiler
by Magnus (＠MangoIV) 14 Aug '26

14 Aug '26

Magnus pushed to branch wip/mangoiv/ci-stages at Glasgow Haskell Compiler / GHC Commits: a643933b by mangoiv at 2026-08-14T14:08:32+02:00 fix: don't do msys deps check on stage1 compiler - - - - - 1 changed file: - .gitlab/ci.sh Changes: ===================================== .gitlab/ci.sh ===================================== @@ -668,7 +668,7 @@ function test_hadrian() { tar -xf "$bindist_tar" -C "$dist_dir" fi - check_msys2_deps _build/stage1/bin/ghc --version + # check_msys2_deps _build/stage1/bin/ghc --version check_release_build # GitLab's log viewer renders ANSI colors, but stdout here is not a tty, View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/a643933b2d8bb6a2f6662f56b9db636… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/a643933b2d8bb6a2f6662f56b9db636… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/mangoiv/ci-stages] fix: out of tree compiler does not imply no hadrian being available
by Magnus (＠MangoIV) 14 Aug '26

14 Aug '26

Magnus pushed to branch wip/mangoiv/ci-stages at Glasgow Haskell Compiler / GHC Commits: 6b2e4fec by mangoiv at 2026-08-14T14:02:35+02:00 fix: out of tree compiler does not imply no hadrian being available - - - - - 1 changed file: - testsuite/driver/testlib.py Changes: ===================================== testsuite/driver/testlib.py ===================================== @@ -1710,8 +1710,8 @@ async def test_common_work(name: TestName, opts, # Skip tests which require hadrian dependencies if we are testing # an out-of-tree compiler as Hadrian is unavailable. See #13897. - if not config.in_tree_compiler and getTestOpts().hadrian_deps - {'test:ghc'}: - do_ways = [] + # if not config.in_tree_compiler and getTestOpts().hadrian_deps - {'test:ghc'}: + # do_ways = [] # Run the required tests... for way in do_ways: View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6b2e4fecfd6fe16b463e882357e6c02… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6b2e4fecfd6fe16b463e882357e6c02… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/27627] Make isTerminatingType 3 valued
by Zubin (＠wz1000) 14 Aug '26

14 Aug '26

Zubin pushed to branch wip/27627 at Glasgow Haskell Compiler / GHC Commits: 226d0699 by Zubin Duggal at 2026-08-14T16:33:12+05:30 Make isTerminatingType 3 valued We only introduce a bottom if it is SurelyNotTerminating We only speculate if it is SurelyTerminating - - - - - 17 changed files: - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/Types/Demand.hs - compiler/GHC/Types/Id/Make.hs - + testsuite/tests/core-to-stg/T27627a/Callee.hs - + testsuite/tests/core-to-stg/T27627a/Caller.hs - + testsuite/tests/core-to-stg/T27627a/Main.hs - + testsuite/tests/core-to-stg/T27627a/T27627a.stdout - + testsuite/tests/core-to-stg/T27627a/all.T - + testsuite/tests/core-to-stg/T27627b/Callee.hs - + testsuite/tests/core-to-stg/T27627b/Caller.hs - + testsuite/tests/core-to-stg/T27627b/Main.hs - + testsuite/tests/core-to-stg/T27627b/T27627b.stdout - + testsuite/tests/core-to-stg/T27627b/all.T Changes: ===================================== compiler/GHC/Core/Lint.hs ===================================== @@ -566,8 +566,8 @@ lintLetBind top_lvl rec_flag binder rhs rhs_ty -- Check that we have not bound bottom at a type whose values are -- assumed to be non-bottom, such as a dictionary. (See #24934, #25924, #27627). -- A deferred type error is an exception. - -- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core - ; checkL (not (isTerminatingType binder_ty) + -- See (5) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core + ; checkL (not (mightBeTerminatingType binder_ty) || not (exprIsDeadEnd rhs) || isDeferredTypeError rhs) (mkBottomTerminatingTyMsg binder) @@ -3827,7 +3827,7 @@ isDeferredTypeError :: CoreExpr -> Bool -- ^ True if it contains a call to `typeError` like -fdefer-type-errors and its -- relatives insert, such as -- case typeError @LiftedRep @() "No instance for ..."# of {} --- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core +-- See (5) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core isDeferredTypeError = go where go (Case scrut _ _ []) = go scrut @@ -3838,7 +3838,7 @@ isDeferredTypeError = go go _ = False mkBottomTerminatingTyMsg :: Id -> SDoc --- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core +-- See (5) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core mkBottomTerminatingTyMsg binder = vcat [ text "Binder of a terminating type is bound to bottom:" , nest 2 (ppr binder <+> dcolon <+> ppr (idType binder)) ===================================== compiler/GHC/Core/Make.hs ===================================== @@ -227,7 +227,7 @@ mkLitRubbish :: Type -> Maybe CoreExpr -- Fail (returning Nothing) if -- * the RuntimeRep of the Type is not monomorphic; -- * the type is (a ~# b), the type of coercion --- * the type is terminating (isTerminatingType), e.g. a dictionary +-- * the type might be terminating (mightBeTerminatingType), e.g. a dictionary -- See INVARIANT 1, 2 and 3 of item (2) in Note [Rubbish literals] -- in GHC.Types.Literal mkLitRubbish ty @@ -235,7 +235,7 @@ mkLitRubbish ty = Nothing -- Satisfy INVARIANT 1 | isEqPred ty = Nothing -- Satisfy INVARIANT 2 - | isTerminatingType ty + | mightBeTerminatingType ty = Nothing -- Satisfy INVARIANT 3 | otherwise = Just (Lit (LitRubbish torc rep) `mkTyApps` [ty]) ===================================== compiler/GHC/Core/Opt/WorkWrap/Utils.hs ===================================== @@ -1068,11 +1068,11 @@ unbox_one_arg opts arg_var -- same type as @id@. Otherwise, no suitable filler could be found. mkAbsentFiller :: Module -> Id -> StrictnessMark -> Maybe CoreExpr mkAbsentFiller mod arg str - -- We never make a filler for a terminating type: it might be speculatively - -- evaluated or have a field projected out of it. + -- We never make a filler for a type that might be terminating: it might be + -- speculatively evaluated or have a field projected out of it. -- See (AF4) in Note [Absent fillers], and -- Note [Don't make fillers for terminating types]. - | isTerminatingType arg_ty + | mightBeTerminatingType arg_ty = Nothing -- The lifted case: bind 'absentError'. See (AF1) in Note [Absent fillers] ===================================== compiler/GHC/Core/Type.hs ===================================== @@ -132,7 +132,9 @@ module GHC.Core.Type ( mightBeLiftedType, mightBeUnliftedType, definitelyLiftedType, definitelyUnliftedType, isAlgType, isDataFamilyApp, isSatTyFamApp, - isPrimitiveType, isStrictType, isTerminatingType, + isPrimitiveType, isStrictType, + IsTerminating(..), typeTerminating, + definitelyTerminatingType, mightBeTerminatingType, unwrapUnaryClasses, isLevityTy, isLevityVar, isRuntimeRepTy, isRuntimeRepVar, isRuntimeRepKindedTy, @@ -2458,22 +2460,46 @@ isAlgType ty isStrictType :: HasDebugCallStack => Type -> Bool isStrictType = isUnliftedType -isTerminatingType :: HasDebugCallStack => Type -> Bool --- ^ True <=> a term of this type cannot be bottom --- This identifies the types described by --- Note [NON-BOTTOM-DICTS invariant] in GHC.Core +-- | Returned by 'typeTerminating'. +-- See Note [NON-BOTTOM-DICTS invariant] in GHC.Core +data IsTerminating + = SurelyTerminating -- ^ A term of this type is never bottom + | SurelyNotTerminating -- ^ A term of this type may well be bottom + | MaybeTerminating -- ^ We cannot tell; see (4) in the Note + deriving (Eq, Show) + +instance Outputable IsTerminating where + ppr = text . show + +typeTerminating :: HasDebugCallStack => Type -> IsTerminating +-- ^ Says whether a term of this type can be bottom. +-- See Note [NON-BOTTOM-DICTS invariant] in GHC.Core -- NB: unlifted types are not terminating types! -- e.g. you can write a term (loop 1)::Int# that diverges. -isTerminatingType ty = case tyConAppTyCon_maybe (unwrapUnaryClasses id ty) of - Just tc -> isClassTyCon tc && not (isUnaryClassTyCon tc) - -- We ask about the type that represents the dictionary, not the - -- type we were handed, because a unary class dictionary **is** the - -- field it wraps. A non-unary class TyCon is terminating; a - -- unary one is left here only when there is a cylce, - -- and then the dictionary really can be bottom. - -- See (1) and (3) in Note [NON-BOTTOM-DICTS invariant] in - -- GHC.Core, and (UCM3) in Note [Unary class magic] - _ -> False +typeTerminating ty + | Just tc <- tyConAppTyCon_maybe unwrapped + , isClassTyCon tc + = if isUnaryClassTyCon tc + then SurelyNotTerminating -- Only left here by a cycle; see (3) + else SurelyTerminating + + | ConstraintLike <- typeTypeOrConstraint unwrapped + = MaybeTerminating -- See (4) + + | otherwise + = SurelyNotTerminating + where + unwrapped = dropForAlls (unwrapUnaryClasses dropForAlls ty) + +definitelyTerminatingType :: HasDebugCallStack => Type -> Bool +-- ^ For callers that will evaluate a term of this type. +-- See (2) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core +definitelyTerminatingType ty = typeTerminating ty == SurelyTerminating + +mightBeTerminatingType :: HasDebugCallStack => Type -> Bool +-- ^ For callers that will put a bottoming term at this type. +-- See (2) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core +mightBeTerminatingType ty = typeTerminating ty /= SurelyNotTerminating -- | Look through unary classes, and return the first type -- that is not a unary class. For ===================================== compiler/GHC/Core/Utils.hs ===================================== @@ -2275,7 +2275,7 @@ app_ok fun_ok primop_ok fun args _other -- Unlifted and terminating types; -- Also c.f. the Var case of exprIsHNF - | isTerminatingType fun_ty -- See Note [exprOkForSpeculation and type classes] + | definitelyTerminatingType fun_ty -- See Note [exprOkForSpeculation and type classes] || definitelyUnliftedType fun_ty -> assertPpr (n_val_args == 0) (ppr fun $$ ppr args) True -- Both terminating types (e.g. Eq a), and unlifted types (e.g. Int#) ===================================== compiler/GHC/Types/Demand.hs ===================================== @@ -91,7 +91,7 @@ import GHC.Types.Unique.FM import GHC.Types.Basic import GHC.Data.Maybe ( orElse ) -import GHC.Core.Type ( Type, isTerminatingType ) +import GHC.Core.Type ( Type, definitelyTerminatingType ) import GHC.Core.DataCon ( splitDataProductType_maybe, StrictnessMark, isMarkedStrict ) import GHC.Core.Multiplicity ( scaledThing ) @@ -1064,7 +1064,7 @@ strictifyDmd = plusDmd seqDmd strictifyDictDmd :: Type -> Demand -> Demand strictifyDictDmd ty (n :* Prod b ds) | not (isAbs n) - , isTerminatingType ty + , definitelyTerminatingType ty , Just (_tc, _arg_tys, _data_con, field_tys) <- splitDataProductType_maybe ty = C_1N :* mkProd b (zipWith strictifyDictDmd (map scaledThing field_tys) ds) -- main idea: ensure it's strict ===================================== compiler/GHC/Types/Id/Make.hs ===================================== @@ -498,7 +498,7 @@ mkDictSelId name clas mkFunctionType ManyTy pred_ty res_ty -- See Note [Type classes and linear types] - terminating = isTerminatingType res_ty || definitelyUnliftedType res_ty + terminating = definitelyTerminatingType res_ty || definitelyUnliftedType res_ty -- If the field is unlifted, it can't be bottom -- Ditto if it's a terminating type ===================================== testsuite/tests/core-to-stg/T27627a/Callee.hs ===================================== @@ -0,0 +1,34 @@ +{-# LANGUAGE GADTs, ConstraintKinds, ScopedTypeVariables, TypeFamilies #-} +{-# LANGUAGE UndecidableInstances, UndecidableSuperClasses, FlexibleInstances #-} +{-# OPTIONS_GHC -fno-worker-wrapper #-} +module Callee where + +import Data.Kind (Constraint) + +-- A Constraint-kinded type family. It always reduces to (TC a), but +-- unwrapUnaryClasses does not reduce type families, so it cannot walk +-- through this field. See (4) in Note [NON-BOTTOM-DICTS invariant]. +type family F a :: Constraint +type instance F a = TC a + +-- Not unary: a superclass field and a method field. +class Eq a => TC a where + tcDummy :: a -> Int + +-- Unary: a single superclass field, whose type is the unreduced family +-- application (F a). +class F a => UC a + +instance TC Int where tcDummy _ = 0 +instance UC Int + +data Dict c where + Dict :: c => Dict c + +{-# NOINLINE discard #-} +discard :: Dict c -> Int +discard _ = 42 + +{-# NOINLINE b #-} +b :: forall a. UC a => a -> Int +b _ = discard (Dict :: Dict (Eq a)) ===================================== testsuite/tests/core-to-stg/T27627a/Caller.hs ===================================== @@ -0,0 +1,10 @@ +module Caller where + +import Callee + +-- b does not use its dictionary, so a's dictionary is absent. Worker/wrapper +-- must not replace it with an error thunk: at runtime a (UC t) dictionary is a +-- (TC t) dictionary, and Callee speculates a superclass selection out of it. +{-# NOINLINE a #-} +a :: UC t => t -> Int +a x = b x + 1 ===================================== testsuite/tests/core-to-stg/T27627a/Main.hs ===================================== @@ -0,0 +1,6 @@ +module Main where + +import Caller + +main :: IO () +main = print (a (3 :: Int)) ===================================== testsuite/tests/core-to-stg/T27627a/T27627a.stdout ===================================== @@ -0,0 +1 @@ +43 ===================================== testsuite/tests/core-to-stg/T27627a/all.T ===================================== @@ -0,0 +1,4 @@ +test('T27627a', + [extra_files(['Main.hs', 'Caller.hs', 'Callee.hs'])], + multimod_compile_and_run, + ['Main', '-O']) ===================================== testsuite/tests/core-to-stg/T27627b/Callee.hs ===================================== @@ -0,0 +1,29 @@ +{-# LANGUAGE GADTs, ConstraintKinds, ScopedTypeVariables, QuantifiedConstraints #-} +{-# LANGUAGE UndecidableInstances, FlexibleInstances, RankNTypes #-} +{-# OPTIONS_GHC -fno-worker-wrapper #-} +module Callee where + +-- Not unary: a superclass field and a method field, so (TC a) is terminating. +class Eq a => TC a where + tcDummy :: a -> Int + +-- Unary: one superclass field, of type (forall a. TC (f a)). +-- unwrapUnaryClasses cannot walk through a forall, so it cannot reach the +-- class underneath. See (4) in Note [NON-BOTTOM-DICTS invariant]. +class (forall a. TC (f a)) => UQ f + +newtype Id a = MkId a +instance Eq (Id a) where _ == _ = True +instance TC (Id a) where tcDummy _ = 0 +instance UQ Id + +data Dict c where + Dict :: c => Dict c + +{-# NOINLINE discard #-} +discard :: Dict c -> Int +discard _ = 42 + +{-# NOINLINE b #-} +b :: forall f. UQ f => f Int -> Int +b _ = discard (Dict :: Dict (Eq (f Int))) ===================================== testsuite/tests/core-to-stg/T27627b/Caller.hs ===================================== @@ -0,0 +1,10 @@ +module Caller where + +import Callee + +-- b does not use its dictionary, so a's dictionary is absent. Worker/wrapper +-- must not replace it with an error thunk: Callee speculates a superclass +-- selection out of it. +{-# NOINLINE a #-} +a :: UQ f => f Int -> Int +a x = b x + 1 ===================================== testsuite/tests/core-to-stg/T27627b/Main.hs ===================================== @@ -0,0 +1,7 @@ +module Main where + +import Callee +import Caller + +main :: IO () +main = print (a (MkId 3 :: Id Int)) ===================================== testsuite/tests/core-to-stg/T27627b/T27627b.stdout ===================================== @@ -0,0 +1 @@ +43 ===================================== testsuite/tests/core-to-stg/T27627b/all.T ===================================== @@ -0,0 +1,4 @@ +test('T27627b', + [extra_files(['Main.hs', 'Caller.hs', 'Callee.hs'])], + multimod_compile_and_run, + ['Main', '-O']) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/226d0699fd676e8f54163519d35d50d… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/226d0699fd676e8f54163519d35d50d… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/romes/27514] 24 commits: hie.yaml: use a polyglot shell/batch script
by Rodrigo Mesquita (＠alt-romes) 14 Aug '26

14 Aug '26

Rodrigo Mesquita pushed to branch wip/romes/27514 at Glasgow Haskell Compiler / GHC Commits: 9df24b7e by sheaf at 2026-08-10T14:28:30-04:00 hie.yaml: use a polyglot shell/batch script This commit merges hie-bios and hie-bios.bat into a single polyglot script. This avoids Windows users having to manually update hie.yaml in order to be able to use HLS. - - - - - 7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00 EPA: Remove type parameter from AnnList This is a step towards cutting AnnList down to its core for formatting lists only - - - - - e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00 driver: Link object files in a deterministic order The object files handed to the linker come from the HomePackageTable, which is ordered by the order in which modules finished compiling. With -j1 that is the build plan order, with -jN it is whatever the scheduler produced, so the same sources can link to different (but equivalent) binaries. The order reaches the output: .text and .rodata contributions are concatenated in link order, so e.g. building the hdav executable of the DAV package twice, once with -j1 and once with -j4, yields two binaries that differ in ~100kB of section contents. Sort the home modules by module before collecting their linkables, guarded under `Opt_ObjectDeterminism` . Fixes #27612 Signed-off-by: Bernhard M. Wiedemann <bwiedemann(a)suse.de> - - - - - 556db2f3 by sheaf at 2026-08-10T21:32:06-04:00 Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite As remarked in #27628, this module currently sits on a knife's edge: if the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then SpecConstr suddenly kicks in and causes disastrous reboxing of the LiftingContext argument. To make this less likely to happen, this commit lowers the SpecConstr threshold. - - - - - c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00 Major patch to re-engineer known-key names This big patch implements the New Plan for known-key names, described in #27013. Read the big Note [Overview of known-key names] in GHC.Types.Name Some things had to be reworked slightly to accomodate the new known-keys design. A significant one was the generation of auxiliary KindRep bindings, which was greatly simplified. Note [Grand plan for Typeable] was updated accordingly. Another example: GHC.Internal.CString was merged into GHC.Internal.Types. Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita(a)gmail.com> The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed Metrics: compile_time/bytes allocated ------------------------------------- Baseline Test Metric value New value Change ------------------------------------------------------------------------------------------ MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD geo. mean +0.1% minimum -8.0% maximum +5.4% All performance regressions were investigated in depth. The surviving ones: - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 - T13820, T18140, T10547, T13035 regress because we load an additional interface and associated Names for GHC.Essentials. ------------------------- Metric Decrease: MultiLayerModules T13379 T13701 T14697 T26989 T4801 T783 T9961 hard_hole_fits mhu-perf size_hello_artifact size_hello_obj size_hello_unicode Metric Increase: LinkableUsage01 LinkableUsage02 MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 T10547 T13035 T13820 T18140 T18698a T18698b T20049 ------------------------- Bumps submodule binary Closes #27013 - - - - - 61665e79 by sheaf at 2026-08-14T01:09:33+02:00 Allow GHC.Essentials to be hidden This commit overhauls several aspects of the known entity handling, in order to allow GHC.Essentials to be hidden without a proliferation of special cases in the compiler. The main contribution is to introduce the 'UnresolvedImport' datatype which cleans up a lot of ad-hoc handling relating to 'ModSummary', fixing #27603. This allows us to reduce duplication, e.g. by having Backpack reuse 'mkUnresolvedImports' instead of replicating the "add implicit imports" logic. It also makes it easier to avoid undesirable edge cases (such as making sure that the Template Haskell 'reifyModule' function does not leak the implicit GHC.Essentials import). In particular, the infamous 'findImportedModuleWithIsBoot' is now simply 'resolveImport', taking a single 'UnresolvedImport' and resolving it to a 'FindResult' (usually a 'Module'). Other changes: - Cache the result of looking up GHC.Essentials (in TcM and DsM environments) to avoid redundant work. This reduces allocations on LinkableUsage01 and hard_hole_fits. - Properly look up known entities for StaticPointers like we do for other known entities everywhere else. This allows e.g. modules in ghc-internal to use -XStaticPointers. - When using multiple home units, we are now careful to handle the situation in which we may have multiple GHC.Essentials modules around. See the new tests under 'driver/multipleHomeUnits'. - - - - - b19fcc1c by Vladislav Zavialov at 2026-08-14T06:26:11-04:00 Increase test coverage of diagnostics, batch 2 Add test cases for the previously untested diagnostics: [GHC-26133] TcRnForeignImportPrimSafeAnn [GHC-68444] SumAltArityExceeded [GHC-63966] IllegalSumAlt [GHC-23882] IllegalDeclaration [GHC-60220] InvalidCCallImpent [GHC-18816] RecGadtNoCons [GHC-38140] GadtNoCons [GHC-37056] InvalidTypeInstanceHeader [GHC-78486] InvalidTyFamInstLHS [GHC-39639] DefaultDataInstDecl [GHC-78822] AssocDefaultNotAssoc [GHC-43510] NotSimpleUnliftedType [GHC-41843] IOResultExpected [GHC-07641] AtLeastOneArgExpected [GHC-52886] InvalidTopDecl Remove unused error constructors: [GHC-92057] ImportLookupAmbiguous - - - - - 7b27f25a by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Drop peak_megabytes_allocated from LinkableUsage tests LinkableUsage01/02 collected all metrics with a 2% tolerance. For peak_megabytes_allocated, whose granularity is 1 MB, that window is under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the test (#27613, #27489). Drop that metric: max_bytes_used guards the Linkable-retention property with byte granularity, at a tolerance that still comfortably exceeds the noise observed in CI. Assisted-by: Claude Fable 5 - - - - - e5de423b by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Don't truncate fractional baselines when computing bounds RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with int() before applying the tolerance. Baselines can be fractional (they are averaged over several measurements), so this skewed the acceptance window downwards: in #27613, a baseline of 33.67 at 2% tolerance yielded bounds (32, 34) instead of (32, 35), rejecting a measurement that was within tolerance. Assisted-by: Claude Fable 5 - - - - - 4137aaa4 by Rodrigo Mesquita at 2026-08-14T11:39:24+01:00 loopImports: Don't dup ms_uid in summary imports We were writing the ms_unitid of the mod summary with every single import of that module That complicated the code (as though the UnitId in that list could ever be something else) and also allocates unnecessarily per every mod import. Very slight allocation decrease measured locally in a few tests: (MultiComponentModulesRecomp: -0.06%; MultiComponentModulesRecomp100: -0.05%) Purely a clean up. - - - - - dee6fefb by Rodrigo Mesquita at 2026-08-14T11:39:24+01:00 downsweep: make control flow simpler and cache correct This refactor extracts the control flow of downsweep into a single function `dfsBuild`, which takes care of iteratively expanding and traversing all nodes of the in-construction module graph necessary to build a full `ModuleGraph`. There are three levels of caching going on, all of which are necessary to make sure we don't do repeated work (notably, NEVER summarise the same module twice). 1. `dfsBuild` accumulates the final module graph and never revisits the same node of the module graph. Cache is keyed by the final `ModuleGraph`s `NodeKey`s. 2. For Module A in home-unit u1, each import in the list of imports needs to be *found* (call to `findImportedModuleWithIsBoot`): at this point, we only have the `ModuleName` of the import, not the `Module`. This *finding* is somewhat expensive, so we cache it as well (`ImportsCache`). The cache key is the home-unit to which the module belongs~[1], the import package qualifier, and the ModuleName. [1] Different home-units will have different package flags, which means potentially different `Module` resolution for the same `ModuleName`. 3. The most expensive operation we want to avoid is summarising a `Module` into a `ModSummary`, which notably involves parsing the module header from scratch. The third cache, in essence, maps a `Module` to its `ModSummary` (named `ModSummaryCache`). This cache upholds the invariant: we NEVER summarise the same module twice. In practice, the cache key is the Module's UnitId and the Source path; the reason is we need to distinguish between `.hs` and `.hs-boot` files, as their summaries will differ. Note that (2) can't guarantee this alone: Two ModuleName imports in separate units can (and likely do) map to the same `Module`. Note that the previous implementation failed to achieve the no-duplicate-work summarisation invariant, and we ended up doing a quadratic amount of processing in scenarios like test `MultiComponentModules100`. See also Note [Downsweep Control Flow and Caching] Fixes #27461 Perf changes: MultiComponentModules(normal) ghc/alloc 2,097,389,264 1,992,186,736 -5.0% GOOD MultiComponentModules100(normal) ghc/alloc 24,310,173,770 21,293,867,360 -12.4% GOOD MultiComponentModulesRecomp(normal) ghc/alloc 602,761,394 498,543,984 -17.3% GOOD MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,968,240 8,895,404,864 -25.2% GOOD ------------------------- Metric Decrease: MultiComponentModules MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 ------------------------- - - - - - 5505174a by Rodrigo Mesquita at 2026-08-14T11:39:25+01:00 implicitRequirementsShallow can never reach HoleUnit findImportedModule will never return `HoleUnit` for a `ModuleName` (a `HoleUnit` can only be found as a signature instantiation, never as a directly *imported* thing) Therefore, we can drop `[ModuleName]` returned by `implicitRequirementsShallow`, which makes many things dead code. Namely, the call to `implicitRequirementsShallow` from GHC.Driver.Downsweep which was a performance bottleneck (for doing lots of duplicate work in findImportedModule) is now entirely gone. Fixes #27053 In an MR with this patch and the downsweep refactor (previous commit), CI says: MultiComponentModules(normal) ghc/alloc 2,097,396,728 1,943,662,304 -7.3% GOOD MultiComponentModules100(normal) ghc/alloc 24,310,182,136 17,227,574,440 -29.1% GOOD MultiComponentModulesRecomp(normal) ghc/alloc 602,769,518 449,973,656 -25.3% GOOD MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,976,408 4,828,894,160 -59.4% GOOD ------------------------- Metric Decrease: MultiComponentModules MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 ------------------------- - - - - - c719c415 by Rodrigo Mesquita at 2026-08-14T11:39:25+01:00 downsweep: Cache negative results When traversing a module graph structure, a uniquely identified node should always expand to the same thing. I don't see how visiting the same node which failed to be expanded a first time would ever successfully expand the second time we try to expand it (eg. when coming from a different edge to it -- it is still the same node!). The node expansion is local, based just based on the node itself, not on the path to get there. Therefore, this patch removes the weird behavior and commentary of `dfsBuild` wrt to `Nothing` not being cached and being potentially expanded a second time around to something different, which was misleading and, ultimately, incorrect. Now, we have a `MGRes`, which is more explicit about a node being Skipped just being a node that is ignored whenever it is found (and that skip is cached) -- and we may want to do this due to failures or due to just trying nodes which might not work on purpose, like hs-boots. We uniformly cache positive and negative results and remove the assumption that there might be an ordering in which the same node visited at a later time might be expanded differently. This makes it possible to traverse the module nodes in parallel without a change in behavior, since there's no longer a hidden ordering requirement. - - - - - 80ef9839 by Rodrigo Mesquita at 2026-08-14T11:39:25+01:00 Organize and clean-up GHC.Driver.Downsweep Simply some cosmetic changes, moving definitions around to structure the module better into its relevant sections (In go (ns ++ ss), it's not a problem to use ++ because it's a good producer and we won't have to append fully before processing the next item in go) - - - - - 61029e85 by Rodrigo Mesquita at 2026-08-14T12:05:41+01:00 Refactor GHC.Driver.MakeAction Pull out of 'runParPipelines' the logic for creating a 'MakeEnv' ready to be used by multiple threads, as that will be useful for downsweep as well (which doesn't fit the 'runPipelines' flow), rather than being just for upsweep. The code is moved and re-structured to match the export list, simplify the sequentiality checks previously both in 'runPipelines' and 'runAllPipelines', which were weirdly similar and confusing; into the two part step where we need these checks: (1) to construct the MakeEnv, (2) to run the MakeActions in parallel. These two steps are separate and used to be too mixed up. Some additional little simplifications or clean ups here and there. - - - - - 4fb51c87 by Rodrigo Mesquita at 2026-08-14T12:05:41+01:00 Refactor GHC.Driver.Downsweep in preparation for parallel downsweep Pure refactor to improve the code to facilitate implementing parallel downsweep in the next commit. This commit puts a MakeEnv into the DownsweepEnv, gives the fields proper names and uses RecordWildcards to simplify, rather than passing around all diagnostic wrappers, driver-message-things and using 10s of positional fields. No behavior changes here! - - - - - 82fa69a5 by Rodrigo Mesquita at 2026-08-14T12:05:41+01:00 Parallelize downsweep traversal Parallelize the downsweep pass s.t. processing and discovering the module graph can be done in parallel (parallelizing work like pre-processing CPP in modules) according to the -j<N> flag used. Using Cabal as an example with -j8, parallel downsweep was 2x faster (from 2s to 1s in downsweep time). The parallel downsweep is all implemented in the previous `dfsBuild` (now named `parDfsBuild`): - We launch a thread for every module we discover that needs to be expanded next, in the `coordinator` thread - Every launched worker thread blocks waiting for a semaphore token (`withAbstractSem`), to respect -j<N> - The main thread waits until both the worklist and pending list is cleared. STM is used crucially to guarantee e.g. we don't have race conditions between taking from the worklist and writing to the pending list while checking whether they are clear. Exceptions are bubbled up to the main thread, which is unblocked and re-throws the exception signaled in `exc_var`, mimicking the previous behavior of `dfsBuild`. See also Note [Parallel Downsweep] Fixes #27514 - - - - - ba1358ea by Rodrigo Mesquita at 2026-08-14T12:05:41+01:00 fixup! Parallelize downsweep traversal - - - - - d333bb06 by Rodrigo Mesquita at 2026-08-14T12:05:42+01:00 fixup! Parallelize downsweep traversal - - - - - 897 changed files: - + changelog.d/T20363 - + changelog.d/downsweep-refactor - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/link-deterministic-order - + changelog.d/parallel-downsweep - + changelog.d/refactor-known-names - compiler/GHC.hs - + compiler/GHC/Builtin.hs - + compiler/GHC/Builtin/KnownKeys.hs - + compiler/GHC/Builtin/KnownOccs.hs - + compiler/GHC/Builtin/Modules.hs - − compiler/GHC/Builtin/Names.hs - − compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/PrimOps/Casts.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - + compiler/GHC/Builtin/TH.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/Uniques.hs-boot - − compiler/GHC/Builtin/Utils.hs - + compiler/GHC/Builtin/WiredIn/Ids.hs - compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs - compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs - compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs - compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/LiberateCase.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/SpecConstr.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/CoreToStg.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Config/Tidy.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Env/KnotVars.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main/Hsc.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/MakeAction.hs - compiler/GHC/Driver/MakeFile.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Plugins.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Dump.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/Hs/Lit.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Syn/Type.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Arrows.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Foreign/Call.hs - compiler/GHC/HsToCore/Foreign/JavaScript.hs - compiler/GHC/HsToCore/Foreign/Utils.hs - compiler/GHC/HsToCore/Foreign/Wasm.hs - compiler/GHC/HsToCore/ListComp.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Match/Constructor.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Pmc/Check.hs - compiler/GHC/HsToCore/Pmc/Desugar.hs - compiler/GHC/HsToCore/Pmc/Ppr.hs - compiler/GHC/HsToCore/Pmc/Solver.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Types.hs - compiler/GHC/HsToCore/Usage.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Iface/Binary.hs - compiler/GHC/Iface/Env.hs - − compiler/GHC/Iface/Env.hs-boot - 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utils/haddock/haddock-api/src/Haddock/Interface/Create.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/17298acd31bf34b73d540c3b1662bc… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/17298acd31bf34b73d540c3b1662bc… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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