[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL] Execute subset of testsuite for cross-compilers
by Sven Tennie (＠supersven) 06 Jun '26
by Sven Tennie (＠supersven) 06 Jun '26
06 Jun '26
Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL at Glasgow Haskell Compiler / GHC
Commits:
ba1bae18 by Sven Tennie at 2026-06-06T21:57:10+02:00
Execute subset of testsuite for cross-compilers
This gives us more confidence that the compiler works. And could be used
as starting point to support CROSS_EMULATOR by the whole testsuite.
- - - - -
1 changed file:
- .gitlab/ci.sh
Changes:
=====================================
.gitlab/ci.sh
=====================================
@@ -697,6 +697,18 @@ function test_hadrian() {
# ---
# > main = putStrLn "hello world"
run diff -w expected actual
+
+ # Run a subset of tests as not all tests are compatible to CROSS_EMULATOR
+ # execution and emulation is pretty slow.
+ EXTRA_HC_OPTS="-fexternal-interpreter" run_hadrian \
+ test \
+ --test-have-intree-files \
+ --test-compiler="${test_compiler}" \
+ --test-root-dirs=testsuite/tests/codeGen \
+ "runtest.opts+=${RUNTEST_ARGS:-}" \
+ "runtest.opts+=--unexpected-output-dir=$TOP/unexpected-test-output" \
+ || fail "hadrian cross codeGen test"
+
elif [[ -n "${REINSTALL_GHC:-}" ]]; then
run_hadrian \
test \
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/ba1bae187eaa324f8e7f6e12c4e8a77…
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[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL] 8 commits: hadrian: Build stage 2 cross compilers
by Sven Tennie (＠supersven) 06 Jun '26
by Sven Tennie (＠supersven) 06 Jun '26
06 Jun '26
Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL at Glasgow Haskell Compiler / GHC
Commits:
3f7fe501 by Matthew Pickering at 2026-06-06T21:30:01+02:00
hadrian: Build stage 2 cross compilers
* Most of hadrian is abstracted over the stage in order to remove the
assumption that the target of all stages is the same platform. This
allows the RTS to be built for two different targets for example.
* Abstracts the bindist creation logic to allow building either normal
or cross bindists. Normal bindists use stage 1 libraries and a stage 2
compiler. Cross bindists use stage 2 libararies and a stage 2
compiler.
* hadrian: Make binary-dist-dir the default build target. This allows us
to have the logic in one place about which libraries/stages to build
with cross compilers. Fixes #24192
New hadrian target:
* `binary-dist-dir-cross`: Build a cross compiler bindist (compiler =
stage 1, libraries = stage 2)
This commit also contains various changes to make stage2 compilers
feasible.
-------------------------
Metric Decrease:
LinkableUsage02
ManyAlternatives
ManyConstructors
MultiComponentModulesRecomp
MultiLayerModulesRecomp
RecordUpdPerf
T10421
T12150
T12227
T12425
T12707
T13035
T13379
T13820
T15703
T16577
T18140
T18282
T18698a
T18698b
T18923
T1969
T20049
T21839c
T3294
T4801
T5030
T5321FD
T5321Fun
T5631
T5642
T6048
T783
T9020
T9198
T9233
T9630
T9872d
T9961
parsing001
Metric Increase:
T26989
hard_hole_fits
-------------------------
Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com>
- - - - -
cb0de0f6 by Matthew Pickering at 2026-06-06T21:30:01+02:00
ci: Test cross bindists
We remove the special logic for testing in-tree cross
compilers and instead test cross compiler bindists, like we do for all
other platforms.
- - - - -
34110c45 by Matthew Pickering at 2026-06-06T21:30:01+02:00
ci: Introduce CROSS_STAGE variable
In preparation for building and testing stage3 bindists we introduce the
CROSS_STAGE variable which is used by a CI job to determine what kind of
bindist the CI job should produce.
At the moment we are only using CROSS_STAGE=2 but in the future we will
have some jobs which set CROSS_STAGE=3 to produce native bindists for a
target, but produced by a cross compiler, which can be tested on by
another CI job on the native platform.
CROSS_STAGE=2: Build a normal cross compiler bindist
CROSS_STAGE=3: Build a stage 3 bindist, one which is a native compiler and library for the target
- - - - -
1586ee34 by Sven Tennie at 2026-06-06T21:30:01+02:00
ci: Increase timeout for emulators
Test runs with emulators naturally take longer than on native machines.
Generate jobs.yml
- - - - -
caa3b18a by Matthew Pickering at 2026-06-06T21:30:01+02:00
ci: Javascript don't set CROSS_EMULATOR
There is no CROSS_EMULATOR needed to run javascript binaries, so we
don't set the CROSS_EMULATOR to some dummy value.
- - - - -
eb0ebfa1 by Sven Tennie at 2026-06-06T21:30:01+02:00
Javascript skip T23697
See #22355 about how HSC2HS and the Javascript target don't play well
together.
- - - - -
27b6ecba by Sven Tennie at 2026-06-06T21:30:01+02:00
Mark T24602 as fragile
It was skipped before (due to CROSS_EMULATOR being set, which changed
for JS), so we don't make things worse by marking it as fragile.
- - - - -
d0c4ec7a by Sven Tennie at 2026-06-06T21:30:01+02:00
Fix T22744 for GHCJS
In fact, this test needs Template Haskell, not necessarily an
interpreter.
- - - - -
60 changed files:
- .gitlab/ci.sh
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- + changelog.d/stage2-cross-compilers
- configure.ac
- distrib/configure.ac.in
- hadrian/README.md
- hadrian/bindist/config.mk.in
- + hadrian/cfg/system.config.host.in
- hadrian/cfg/system.config.in
- + hadrian/cfg/system.config.target.in
- hadrian/hadrian.cabal
- hadrian/src/Base.hs
- + hadrian/src/BindistConfig.hs
- hadrian/src/Builder.hs
- hadrian/src/Context.hs
- hadrian/src/Expression.hs
- hadrian/src/Flavour.hs
- hadrian/src/Flavour/Type.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Haskell/Hash.hs
- hadrian/src/Hadrian/Oracles/TextFile.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Oracles/Flavour.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Oracles/TestSettings.hs
- hadrian/src/Packages.hs
- hadrian/src/Rules.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/CabalReinstall.hs
- hadrian/src/Rules/Changelog.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Gmp.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Program.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cabal.hs
- hadrian/src/Settings/Builders/Common.hs
- hadrian/src/Settings/Builders/Configure.hs
- hadrian/src/Settings/Builders/DeriveConstants.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/Hsc2Hs.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Builders/SplitSections.hs
- hadrian/src/Settings/Default.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Performance.hs
- hadrian/src/Settings/Flavours/QuickCross.hs
- hadrian/src/Settings/Packages.hs
- hadrian/src/Settings/Program.hs
- hadrian/src/Settings/Warnings.hs
- libraries/base/tests/all.T
- testsuite/ghc-config/ghc-config.hs
- testsuite/tests/javascript/closure/all.T
- testsuite/tests/perf/compiler/all.T
The diff was not included because it is too large.
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Jaro Reinders pushed to branch wip/reduce-type-in-stg at Glasgow Haskell Compiler / GHC
Commits:
ad58ea40 by Jaro Reinders at 2026-06-06T20:09:49+02:00
Add note
- - - - -
1 changed file:
- compiler/GHC/Stg/Syntax.hs
Changes:
=====================================
compiler/GHC/Stg/Syntax.hs
=====================================
@@ -108,8 +108,55 @@ import GHC.Builtin.Types.Prim
smallArrayPrimTyCon,
smallMutableArrayPrimTyCon )
+-- This is a newtype because it is important to distinguish it from Type which
+-- Kind is otherwise equal to.
+-- See Note [Kinds in STG]
newtype StgKind = MkStgKind { getStgKind :: Kind }
+{-
+Note [Kinds in STG]
+~~~~~~~~~~~~~~~~~~~
+
+Whereas Core is type-annotated, STG is kind-annotated.
+
+Just as many different values may have a single type, so many different
+types may have a single kind. So kinds are a "coarser approximation" to the
+values being manipulated; and that is what we want in STG.
+
+There are two reasons for this:
+
+(1) It is easier for third party projects to compile to STG. The type system of
+ another language might not be compatible with GHC's type system. In such a
+ case the kind system is often still compatible because it is so much coarser.
+ Example projects are Jaro Reinders' agda2stg and Csaba Hruska's external-stg.
+
+(2) It allows for more aggressive optimizations. In STG we may do
+ type-incorrect things that are kind-correct. For example consider
+ the following function:
+
+ f :: Either a b -> Either a c
+ f = \x -> case x of r
+ Left x -> Left x
+ Right _ -> error "urk"
+
+ We would want to avoid reallocating the 'Left' constructor:
+
+ f :: Either a b -> Either a c
+ f = \x -> case x of r
+ Left _ -> r <------------- NB
+ Right _ -> error "urk"
+
+ This is not type-safe in Core, but it is kind-safe in STG. So, using
+ the coarser notion of kinds in STG allows us to do more aggressive
+ optimizations. Note, however, that we do not implement any such
+ optimizations yet.
+
+Note that the kinds do not always accurately reflect the final runtime
+representation. For example, on the JS backend the kind 'TYPE Int64Rep'
+might eventually be rewritten to 'TYPE (TupleRep [Int32Rep,Int32Rep])'
+because there is no 64 bit integer type in JS.
+-}
+
{-
************************************************************************
* *
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[Git][ghc/ghc][wip/az/exactprint-annotation-rationalisation] 13 commits: fix typo : compete with performance, not complete
by Alan Zimmerman (＠alanz) 06 Jun '26
by Alan Zimmerman (＠alanz) 06 Jun '26
06 Jun '26
Alan Zimmerman pushed to branch wip/az/exactprint-annotation-rationalisation at Glasgow Haskell Compiler / GHC
Commits:
f2f5c6ba by Nikita Efremov at 2026-06-02T16:04:54+00:00
fix typo : compete with performance, not complete
- - - - -
5524ea0e by Wolfgang Jeltsch at 2026-06-03T08:01:26-04:00
Make the current `base` buildable with GHC 9.14
This comprises the following changes:
* Disable some imports into `GHC.Base` for GHC 9.14
* Disable some imports into `Prelude` for GHC 9.14
* Disable separate `ArrowLoop` import for GHC 9.14
* Disable `GHC.Internal.STM` import for GHC 9.14
* Disable `GHC.Internal.Unicode.Version` import for GHC 9.14
* Disable `GHC.Internal.TH.Monad` import for GHC 9.14
* Add alternative `fixIO` import for GHC 9.14
* Add alternative `unsafeCodeCoerce` import for GHC 9.14
* Disable hiding of imported SIMD operations for GHC 9.14
* Disable use of GHC 9.14’s `printToHandleFinalizerExceptionHandler`
* Enable use of `getFileHash` from `ghc-internal` for GHC 9.14
* Make `thenA` available for GHC 9.14
* Make `thenM` available for GHC 9.14
* Disable translation of `IoManagerFlagPoll` for GHC 9.14
* Add `hGetNewlineMode` for GHC 9.14
- - - - -
d3438055 by Enrico Maria De Angelis at 2026-06-03T08:02:17-04:00
Fix #27067 - Clarify haddocks on `minusNaturalMaybe`
- - - - -
f9bcfac2 by sheaf at 2026-06-03T14:47:19-04:00
Avoid mkTick in Core Prep breaking ANF
As discovered in #27182, mkTick can break ANF. This patch introduces a
variant of mkTick that skips the single optimisation that could break
ANF. This is preferrable over switching to the raw Tick constructor,
as the latter may introduce spurious cost centres in profiling reports.
This is a temporary measure until we more thoroughly refactor how
mkTick works (see #27141).
See Note [mkTick breaks ANF] in GHC.CoreToStg.Prep.
Fixes #27182
- - - - -
cf1fd661 by Artem Pelenitsyn at 2026-06-03T14:48:09-04:00
clarify comment for getSizeofMutableByteArray#: we get the size in bytes, not "elements"
- - - - -
5b09c1f0 by Alan Zimmerman at 2026-06-03T22:36:23+01:00
EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas
This matches what it actually does.
- - - - -
febc177a by Alan Zimmerman at 2026-06-03T22:36:24+01:00
AZ: add some exactprint allium specs
- - - - -
71a49989 by Alan Zimmerman at 2026-06-03T22:36:24+01:00
EPA: Add an overview doc for exact printing
- - - - -
4d25c22f by Simon Peyton Jones at 2026-06-03T22:36:24+01:00
Added an intro section
- - - - -
67c16090 by Alan Zimmerman at 2026-06-03T22:36:24+01:00
EPA: Use standard type family declaration for Anno
- - - - -
e034209a by Alan Zimmerman at 2026-06-03T22:36:24+01:00
TTG: Add extension points to HsConDetails
In contrast to normal TTG extension points, these are indexed by the
arg and rec type parameters, since HsConDetails is a container type
used in various roles. Each of these uses a GhcPass based structure,
so the overall effect is a family of pass-sensitive extension points.
data HsConDetails p arg rec
= PrefixCon !(XPrefixCon p) [arg] -- C @t1 @t2 p1 p2 p3
| RecCon !(XRecCon p) rec -- C { x = p1, y = p2 }
| InfixCon !(XInfixCon p) arg arg -- p1 `C` p2
| XHsConDetails !(XXHsConDetails p)
type family XPrefixCon p
type family XRecCon p
type family XInfixCon p
type family XXHsConDetails p
- - - - -
834e47a6 by Alan Zimmerman at 2026-06-03T22:36:24+01:00
EPA: remove LocatedLI / SrcSpanAnnLI
These were used for module export lists, and import decl lists.
Replace them with direct capture of the relevant EP Annotations in
HsModule and ImportDecl annotation extension points.
Also use the HsConDetails RecCon extension point to capture the braces
in a record constructor
- - - - -
daeacc5b by Alan Zimmerman at 2026-06-06T17:46:34+01:00
EPA: Remove LocatedC / SrcSpanAnnC
Used for contexts
- - - - -
124 changed files:
- + ExactPrint.md
- + changelog.d/T27182.md
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/BooleanFormula.hs
- compiler/GHC/Hs.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Stats.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Constructor.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/Language/Haskell/Syntax.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/ImpExp.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Type.hs
- docs/users_guide/javascript.rst
- ghc/GHCi/UI.hs
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Arrow.hs
- libraries/base/src/Control/Monad.hs
- libraries/base/src/Data/Array/Byte.hs
- libraries/base/src/Data/Fixed.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/Conc.hs
- libraries/base/src/GHC/Conc/Sync.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- libraries/base/src/GHC/IO/Handle.hs
- libraries/base/src/GHC/RTS/Flags.hs
- libraries/base/src/GHC/Unicode.hs
- libraries/base/src/GHC/Weak.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- libraries/base/src/Prelude.hs
- libraries/base/src/System/IO.hs
- libraries/base/src/System/Mem/Weak.hs
- libraries/ghc-internal/src/GHC/Internal/Natural.hs
- + specs/exact-print-core.allium
- + specs/exact-print-cpp.allium
- + specs/exact-print-parser.allium
- + specs/exact-print-printing.allium
- + specs/exact-print-transform.allium
- testsuite/tests/ghc-api/T25121_status.stdout
- testsuite/tests/ghc-api/exactprint/T22919.stderr
- testsuite/tests/ghc-api/exactprint/Test20239.stderr
- testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr
- testsuite/tests/haddock/should_compile_flag_haddock/T17544.stderr
- testsuite/tests/haddock/should_compile_flag_haddock/T17544_kw.stderr
- testsuite/tests/haddock/should_compile_flag_haddock/T24221.stderr
- testsuite/tests/module/mod185.stderr
- testsuite/tests/parser/should_compile/DumpParsedAst.stderr
- testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr
- testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
- testsuite/tests/parser/should_compile/DumpSemis.stderr
- testsuite/tests/parser/should_compile/KindSigs.stderr
- testsuite/tests/parser/should_compile/T14189.stderr
- testsuite/tests/parser/should_compile/T15323.stderr
- testsuite/tests/parser/should_compile/T20452.stderr
- testsuite/tests/parser/should_compile/T20718.stderr
- testsuite/tests/parser/should_compile/T20718b.stderr
- testsuite/tests/parser/should_compile/T20846.stderr
- testsuite/tests/parser/should_compile/T23315/T23315.stderr
- testsuite/tests/printer/AnnotationNoListTuplePuns.stdout
- testsuite/tests/printer/Makefile
- testsuite/tests/printer/T18791.stderr
- testsuite/tests/printer/Test20297.stdout
- testsuite/tests/printer/Test24533.stdout
- + testsuite/tests/profiling/should_compile/T27182.hs
- testsuite/tests/profiling/should_compile/all.T
- utils/check-exact/ExactPrint.hs
- utils/check-exact/Main.hs
- utils/check-exact/Transform.hs
- utils/check-exact/Utils.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
- utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
- utils/haddock/haddock-api/src/Haddock/Convert.hs
- utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
- utils/haddock/haddock-api/src/Haddock/Interface/LexParseRn.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
- utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
- utils/haddock/haddock-api/src/Haddock/Types.hs
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[Git][ghc/ghc][wip/sjakobi/T25450-march-native] Implement -march=native for x86/x86_64
by Simon Jakobi (＠sjakobi2) 06 Jun '26
by Simon Jakobi (＠sjakobi2) 06 Jun '26
06 Jun '26
Simon Jakobi pushed to branch wip/sjakobi/T25450-march-native at Glasgow Haskell Compiler / GHC
Commits:
877a0b05 by Simon Jakobi at 2026-06-06T19:00:50+02:00
Implement -march=native for x86/x86_64
Add a -march=native flag that probes the host CPU at parse time via an
in-process CPUID/XGETBV helper and enables the matching CPU-feature
DynFlags, so the effect applies to both the NCG and LLVM backends.
The flag handler only records a marker, since flag parsing is pure; the
probe and feature application run in parseDynamicFlagsFull, guarded
against non-x86 targets and cross-compilation. Detected SSE/AVX and BMI
levels are collapsed to their maximum and folded additively into the
existing feature flags, so explicit -m... options are never disabled.
The probe is memoized for the lifetime of the process.
On x86_64 macOS the kernel enables AVX-512 XSAVE state lazily, so XCR0
reads back with the opmask/ZMM bits clear until a process first faults on
an AVX-512 instruction. To avoid a false negative there, AVX512F is
queried via sysctlbyname(hw.optional.avx512f); the sub-features
(BW/CD/DQ/VL) are still decoded from CPUID leaf 7, and AVX/AVX2/FMA stay
on the XCR0 path, which is correct on macOS.
The flag is registered in expected-undocumented-flags.txt due to #27321.
Thanks to @aratamizuki for help with AVX-512 detection on macOS.
Closes #25450
Assisted-by: Claude Opus 4.8 <noreply(a)anthropic.com>
- - - - -
16 changed files:
- + changelog.d/march-native
- changelog.d/print-enabled-cpu-features
- + compiler/GHC/Driver/CpuFeatures.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Session.hs
- + compiler/cbits/cpu_features_x86.c
- compiler/ghc.cabal.in
- docs/users_guide/expected-undocumented-flags.txt
- docs/users_guide/using.rst
- testsuite/tests/codeGen/should_gen_asm/all.T
- + testsuite/tests/codeGen/should_gen_asm/march-native-enables-popcnt.asm
- + testsuite/tests/codeGen/should_gen_asm/march-native-enables-popcnt.hs
- testsuite/tests/driver/all.T
- + testsuite/tests/driver/march_native.stdout
- + testsuite/tests/driver/march_native_additive.stdout
- + testsuite/tests/driver/march_native_unsupported_arch.stderr
Changes:
=====================================
changelog.d/march-native
=====================================
@@ -0,0 +1,12 @@
+section: compiler
+synopsis: Add -march=native flag
+issues: #25450
+mrs: !16126
+
+description:
+ GHC now supports ``-march=native`` on x86 and x86_64. It probes the CPU of the
+ machine running GHC and enables all of the corresponding ``-m...`` CPU-feature
+ options automatically (such as ``-msse4.2``, ``-mavx2``, ``-mbmi2`` and
+ ``-mfma``), for both the native code generator and the LLVM backend. The
+ detected features are enabled in addition to any explicitly requested feature
+ flags. The flag is rejected for non-x86 targets and when cross-compiling.
=====================================
changelog.d/print-enabled-cpu-features
=====================================
@@ -8,9 +8,11 @@ description:
prints a JSON object describing the CPU features currently enabled for code
generation, together with a set of ``-m...`` flags that reproduce the
effective feature set for the current target.
- Dynamic options such as ``-mavx2`` and ``-mbmi2`` are respected. ::
+ Dynamic options such as ``-mavx2`` and ``-mbmi2`` are respected, so the flag
+ can also be used to inspect which features :ghc-flag:`-march=native` detected
+ and enabled. ::
- $ ghc -mavx2 --print-enabled-cpu-features
+ $ ghc -march=native --print-enabled-cpu-features
{"tag":"enabled-cpu-features","version":1,"target":"x86_64-linux-gnu",
- "features":["SSE","SSE2","SSE3","SSSE3","SSE4.1","SSE4.2","AVX","AVX2"],
- "as_m_flags":["-mavx2"]}
+ "features":["SSE","SSE2","SSE3","SSSE3","SSE4.1","SSE4.2","AVX","AVX2","BMI1","BMI2","FMA"],
+ "as_m_flags":["-mavx2","-mbmi2","-mfma"]}
=====================================
compiler/GHC/Driver/CpuFeatures.hs
=====================================
@@ -0,0 +1,87 @@
+{-# LANGUAGE CPP #-}
+
+module GHC.Driver.CpuFeatures
+ ( X86CpuFeature(..)
+ , cachedX86CpuFeatures
+ ) where
+
+import GHC.Prelude
+
+import Data.Word (Word64)
+import System.IO.Unsafe (unsafePerformIO)
+
+-- | x86 CPU features understood by GHC's native CPU feature probe.
+data X86CpuFeature
+ = SSE2
+ | SSE3
+ | SSSE3
+ | SSE4_1
+ | SSE4_2
+ | AVX
+ | AVX2
+ | AVX512F
+ | AVX512BW
+ | AVX512CD
+ | AVX512DQ
+ | AVX512VL
+ | BMI1
+ | BMI2
+ | FMA
+ | GFNI
+ deriving (Eq, Ord, Show)
+
+-- | Decode the bitmask returned by 'ghc_detect_x86_cpu_features'.
+--
+-- NOTE: Bit positions must match the enum in @compiler/cbits/cpu_features_x86.c@.
+decodeX86CpuFeatureMask :: Word64 -> [X86CpuFeature]
+decodeX86CpuFeatureMask mask =
+ [ feat
+ | (bit_ix, feat) <- cpuFeatureBitLayout
+ , testBit mask bit_ix
+ ]
+
+-- | Low-level FFI access to the C probe.
+detectX86CpuFeatureMask :: IO Word64
+#if defined(javascript_HOST_ARCH)
+detectX86CpuFeatureMask = pure 0
+#else
+detectX86CpuFeatureMask = c_ghc_detect_x86_cpu_features
+#endif
+
+-- | Probe host x86 CPU features and decode them into an ordered feature list.
+detectX86CpuFeatures :: IO [X86CpuFeature]
+detectX86CpuFeatures = decodeX86CpuFeatureMask <$> detectX86CpuFeatureMask
+
+-- | The host's x86 CPU features, probed once and memoized.
+--
+-- CPUID results are constant for the lifetime of the process, so probing more
+-- than once (e.g. once per @-march=native@ in a command line or file pragma)
+-- is wasteful. This is referentially transparent despite the FFI call.
+cachedX86CpuFeatures :: [X86CpuFeature]
+cachedX86CpuFeatures = unsafePerformIO detectX86CpuFeatures
+{-# NOINLINE cachedX86CpuFeatures #-}
+
+cpuFeatureBitLayout :: [(Int, X86CpuFeature)]
+cpuFeatureBitLayout =
+ [ (0, SSE2)
+ , (1, SSE3)
+ , (2, SSSE3)
+ , (3, SSE4_1)
+ , (4, SSE4_2)
+ , (5, AVX)
+ , (6, AVX2)
+ , (7, AVX512F)
+ , (8, AVX512BW)
+ , (9, AVX512CD)
+ , (10, AVX512DQ)
+ , (11, AVX512VL)
+ , (12, BMI1)
+ , (13, BMI2)
+ , (14, FMA)
+ , (15, GFNI)
+ ]
+
+#if !defined(javascript_HOST_ARCH)
+foreign import ccall unsafe "ghc_detect_x86_cpu_features"
+ c_ghc_detect_x86_cpu_features :: IO Word64
+#endif
=====================================
compiler/GHC/Driver/DynFlags.hs
=====================================
@@ -470,6 +470,8 @@ data DynFlags = DynFlags {
fma :: Bool, -- ^ Enable FMA instructions.
gfni :: Bool, -- ^ Enable GFNI Instructions.
la664 :: Bool, -- ^ Enable LA664 instructions
+ marchNative :: Bool, -- ^ @-march=native@ was requested; the host
+ -- CPU features are applied during flag parsing.
-- Constants used to control the amount of optimization done.
@@ -760,6 +762,7 @@ defaultDynFlags mySettings =
gfni = False,
-- For LoongArch, la464 is used by default.
la664 = False,
+ marchNative = False,
maxInlineAllocSize = 128,
maxInlineMemcpyInsns = 32,
=====================================
compiler/GHC/Driver/Session.hs
=====================================
@@ -245,6 +245,8 @@ import GHC.Platform
import GHC.Platform.Ways
import GHC.Platform.Profile
import GHC.Platform.ArchOS
+import GHC.Platform.Host (hostPlatformArch)
+import qualified GHC.Driver.CpuFeatures as Cpu
import GHC.Unit.Types
import GHC.Unit.Parser
@@ -906,8 +908,12 @@ parseDynamicFlagsFull activeFlags cmdline logger dflags0 args = do
unless (null errs) $ liftIO $ throwGhcExceptionIO $ errorsToGhcException $
map ((rdr . ppr . getLoc &&& unLoc) . errMsg) $ errs
+ -- Apply -march=native: probe the host CPU and enable the matching feature
+ -- flags. This needs IO (CPUID), so it cannot live in the pure flag handlers.
+ dflags1' <- applyMarchNative dflags1
+
-- check for disabled flags in safe haskell
- let (dflags2, sh_warns) = safeFlagCheck cmdline dflags1
+ let (dflags2, sh_warns) = safeFlagCheck cmdline dflags1'
theWays = ways dflags2
unless (allowed_combination theWays) $ liftIO $
@@ -1743,6 +1749,7 @@ dynamic_flags_deps = [
, make_ord_flag defGhcFlag "mavx512vl" (noArg (\d -> d { avx512vl = True }))
, make_ord_flag defGhcFlag "mfma" (noArg (\d -> d { fma = True }))
, make_ord_flag defGhcFlag "mgfni" (noArg (\d -> d { gfni = True }))
+ , make_ord_flag defGhcFlag "march=native" (noArg (\d -> d { marchNative = True }))
, make_ord_flag defGhcFlag "mla664" (noArg (\d -> d { la664 = True }))
@@ -3806,6 +3813,59 @@ x86AsMFlags dflags =
gfniFlags = [ "-mgfni" | gfni dflags ]
+-- | Apply a requested @-march=native@ by probing the host CPU and enabling the
+-- matching CPU-feature flags.
+--
+-- This runs in 'parseDynamicFlagsFull' rather than in a flag handler because the
+-- CPUID probe needs 'IO', whereas flag handlers are pure. The detected features
+-- are folded into the existing feature 'DynFlags' so that 'makeDynFlagsConsistent'
+-- and the backends treat them exactly like the corresponding @-m...@ flags.
+applyMarchNative :: MonadIO m => DynFlags -> m DynFlags
+applyMarchNative dflags
+ | not (marchNative dflags) = return dflags
+ | otherwise = do
+ let arch = platformArch (targetPlatform dflags)
+ unless (arch == ArchX86 || arch == ArchX86_64) $ liftIO $
+ throwGhcExceptionIO $ CmdLineError
+ "-march=native is not supported on this target yet (only x86 and x86_64 are supported so far)"
+ unless (arch == hostPlatformArch) $ liftIO $
+ throwGhcExceptionIO $ CmdLineError
+ "-march=native is not supported when cross-compiling"
+ return (applyX86CpuFeatures Cpu.cachedX86CpuFeatures dflags)
+
+-- | Enable the 'DynFlags' CPU-feature fields corresponding to a probed set of
+-- host x86 features. SSE/AVX and BMI levels are collapsed to their maximum,
+-- since 'sseAvxVersion' and 'bmiVersion' each record a single level.
+applyX86CpuFeatures :: [Cpu.X86CpuFeature] -> DynFlags -> DynFlags
+applyX86CpuFeatures feats dflags = dflags
+ { sseAvxVersion = foldr (max . Just) (sseAvxVersion dflags) sseLevels
+ , bmiVersion = foldr (max . Just) (bmiVersion dflags) bmiLevels
+ , avx512f = avx512f dflags || has Cpu.AVX512F
+ , avx512bw = avx512bw dflags || has Cpu.AVX512BW
+ , avx512cd = avx512cd dflags || has Cpu.AVX512CD
+ , avx512dq = avx512dq dflags || has Cpu.AVX512DQ
+ , avx512vl = avx512vl dflags || has Cpu.AVX512VL
+ , fma = fma dflags || has Cpu.FMA
+ , gfni = gfni dflags || has Cpu.GFNI
+ }
+ where
+ has feat = feat `elem` feats
+ sseLevels = [ lvl | feat <- feats, Just lvl <- [sseLevelOf feat] ]
+ bmiLevels = [ lvl | feat <- feats, Just lvl <- [bmiLevelOf feat] ]
+ sseLevelOf feat = case feat of
+ Cpu.SSE2 -> Just SSE2
+ Cpu.SSE3 -> Just SSE3
+ Cpu.SSSE3 -> Just SSSE3
+ Cpu.SSE4_1 -> Just SSE4
+ Cpu.SSE4_2 -> Just SSE42
+ Cpu.AVX -> Just AVX1
+ Cpu.AVX2 -> Just AVX2
+ _ -> Nothing
+ bmiLevelOf feat = case feat of
+ Cpu.BMI1 -> Just BMI1
+ Cpu.BMI2 -> Just BMI2
+ _ -> Nothing
+
-- | Query if the target RTS has the given 'Ways'. It's computed from
-- the @"RTS ways"@ field in the settings file.
targetHasRTSWays :: DynFlags -> Ways -> Bool
=====================================
compiler/cbits/cpu_features_x86.c
=====================================
@@ -0,0 +1,208 @@
+#include <HsFFI.h>
+#include <stdint.h>
+
+#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
+#include <immintrin.h>
+#include <intrin.h>
+#endif
+
+#if !defined(_MSC_VER) && (defined(__i386__) || defined(__x86_64__))
+#include <cpuid.h>
+#endif
+
+#if defined(__APPLE__) && (defined(__i386__) || defined(__x86_64__))
+#include <sys/sysctl.h>
+#endif
+
+enum {
+ GHC_X86_FEAT_SSE2 = 0,
+ GHC_X86_FEAT_SSE3,
+ GHC_X86_FEAT_SSSE3,
+ GHC_X86_FEAT_SSE4_1,
+ GHC_X86_FEAT_SSE4_2,
+ GHC_X86_FEAT_AVX,
+ GHC_X86_FEAT_AVX2,
+ GHC_X86_FEAT_AVX512F,
+ GHC_X86_FEAT_AVX512BW,
+ GHC_X86_FEAT_AVX512CD,
+ GHC_X86_FEAT_AVX512DQ,
+ GHC_X86_FEAT_AVX512VL,
+ GHC_X86_FEAT_BMI1,
+ GHC_X86_FEAT_BMI2,
+ GHC_X86_FEAT_FMA,
+ GHC_X86_FEAT_GFNI
+};
+
+#define SET_FEAT(mask, bit) ((mask) |= ((HsWord64)1ULL << (bit)))
+
+static int ghc_cpuid_count(uint32_t leaf, uint32_t subleaf,
+ uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d)
+{
+#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
+ int regs[4];
+ __cpuidex(regs, (int)leaf, (int)subleaf);
+ *a = (uint32_t)regs[0];
+ *b = (uint32_t)regs[1];
+ *c = (uint32_t)regs[2];
+ *d = (uint32_t)regs[3];
+ return 1;
+#elif defined(__i386__) || defined(__x86_64__)
+ return __get_cpuid_count(leaf, subleaf, a, b, c, d);
+#else
+ (void)leaf;
+ (void)subleaf;
+ (void)a;
+ (void)b;
+ (void)c;
+ (void)d;
+ return 0;
+#endif
+}
+
+static uint64_t ghc_xgetbv0(void)
+{
+#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
+ return (uint64_t)_xgetbv(0);
+#elif defined(__i386__) || defined(__x86_64__)
+ uint32_t eax, edx;
+ __asm__ volatile(".byte 0x0f, 0x01, 0xd0" /* xgetbv */
+ : "=a"(eax), "=d"(edx)
+ : "c"(0));
+ return ((uint64_t)edx << 32) | (uint64_t)eax;
+#else
+ return 0;
+#endif
+}
+
+#if defined(__APPLE__) && (defined(__i386__) || defined(__x86_64__))
+/* Query a macOS CPU-capability sysctl, e.g. "hw.optional.avx512f". */
+static int ghc_macos_sysctl_flag(const char *name)
+{
+ int result = 0;
+ size_t len = sizeof(result);
+ if (sysctlbyname(name, &result, &len, NULL, 0) != 0) {
+ return 0;
+ }
+ return result != 0;
+}
+#endif
+
+HsWord64 ghc_detect_x86_cpu_features(void)
+{
+ HsWord64 feats = 0;
+
+#if defined(_M_IX86) || defined(_M_X64) || defined(__i386__) || defined(__x86_64__)
+ uint32_t a, b, c, d;
+ uint32_t max_basic = 0;
+
+ if (!ghc_cpuid_count(0, 0, &a, &b, &c, &d)) {
+ return 0;
+ }
+ max_basic = a;
+ if (max_basic < 1) {
+ return 0;
+ }
+
+ ghc_cpuid_count(1, 0, &a, &b, &c, &d);
+
+ {
+ int has_sse2 = !!(d & (1u << 26));
+ int has_sse3 = !!(c & (1u << 0));
+ int has_ssse3 = !!(c & (1u << 9));
+ int has_sse4_1 = !!(c & (1u << 19));
+ int has_sse4_2 = !!(c & (1u << 20));
+ int has_fma_hw = !!(c & (1u << 12));
+ int has_avx_hw = !!(c & (1u << 28));
+ int has_osxsave = !!(c & (1u << 27));
+
+ int avx_usable = 0;
+ int avx512_usable = 0;
+
+ if (has_osxsave) {
+ uint64_t xcr0 = ghc_xgetbv0();
+ avx_usable = ((xcr0 & 0x6u) == 0x6u); /* XMM + YMM state */
+ avx512_usable = ((xcr0 & 0xE6u) == 0xE6u); /* XMM+YMM+opmask+ZMM */
+ }
+
+#if defined(__APPLE__)
+ /* On x86_64 macOS the kernel enables AVX-512 XSAVE state lazily: XCR0
+ reads back with the opmask/ZMM bits clear until a process first faults
+ on an AVX-512 instruction, so the XCR0 check above is a false negative
+ on AVX-512-capable Macs. Use the OS feature query instead. Checking
+ AVX512F alone suffices here; the AVX-512 sub-features (BW/CD/DQ/VL) are
+ still decoded from CPUID leaf 7 below.
+
+ Refs:
+ https://zenn.dev/mod_poppo/articles/detect-processor-features-x86?locale=en…
+ https://github.com/minoki/haskell-cpu-features */
+ avx512_usable = ghc_macos_sysctl_flag("hw.optional.avx512f");
+#endif
+
+ if (has_sse2) {
+ SET_FEAT(feats, GHC_X86_FEAT_SSE2);
+ }
+ if (has_sse3) {
+ SET_FEAT(feats, GHC_X86_FEAT_SSE3);
+ }
+ if (has_ssse3) {
+ SET_FEAT(feats, GHC_X86_FEAT_SSSE3);
+ }
+ if (has_sse4_1) {
+ SET_FEAT(feats, GHC_X86_FEAT_SSE4_1);
+ }
+ if (has_sse4_2) {
+ SET_FEAT(feats, GHC_X86_FEAT_SSE4_2);
+ }
+ if (has_avx_hw && avx_usable) {
+ SET_FEAT(feats, GHC_X86_FEAT_AVX);
+ }
+ if (has_fma_hw && avx_usable) {
+ SET_FEAT(feats, GHC_X86_FEAT_FMA);
+ }
+
+ if (max_basic >= 7 && ghc_cpuid_count(7, 0, &a, &b, &c, &d)) {
+ int has_bmi1 = !!(b & (1u << 3));
+ int has_avx2_hw = !!(b & (1u << 5));
+ int has_bmi2 = !!(b & (1u << 8));
+ int has_avx512f = !!(b & (1u << 16));
+ int has_avx512dq = !!(b & (1u << 17));
+ int has_avx512cd = !!(b & (1u << 28));
+ int has_avx512bw = !!(b & (1u << 30));
+ int has_avx512vl = !!(b & (1u << 31));
+ int has_gfni = !!(c & (1u << 8));
+
+ if (has_bmi1) {
+ SET_FEAT(feats, GHC_X86_FEAT_BMI1);
+ }
+ if (has_bmi2) {
+ SET_FEAT(feats, GHC_X86_FEAT_BMI2);
+ }
+ if (avx_usable && has_avx2_hw) {
+ SET_FEAT(feats, GHC_X86_FEAT_AVX2);
+ }
+
+ if (avx512_usable && has_avx512f) {
+ SET_FEAT(feats, GHC_X86_FEAT_AVX512F);
+ if (has_avx512bw) {
+ SET_FEAT(feats, GHC_X86_FEAT_AVX512BW);
+ }
+ if (has_avx512cd) {
+ SET_FEAT(feats, GHC_X86_FEAT_AVX512CD);
+ }
+ if (has_avx512dq) {
+ SET_FEAT(feats, GHC_X86_FEAT_AVX512DQ);
+ }
+ if (has_avx512vl) {
+ SET_FEAT(feats, GHC_X86_FEAT_AVX512VL);
+ }
+ }
+
+ if (has_gfni) {
+ SET_FEAT(feats, GHC_X86_FEAT_GFNI);
+ }
+ }
+ }
+#endif
+
+ return feats;
+}
=====================================
compiler/ghc.cabal.in
=====================================
@@ -187,6 +187,7 @@ Library
else
c-sources:
cbits/cutils.c
+ cbits/cpu_features_x86.c
cbits/genSym.c
cbits/keepCAFsForGHCi.c
@@ -514,6 +515,7 @@ Library
GHC.Driver.Config.StgToCmm
GHC.Driver.Config.Tidy
GHC.Driver.Config.StgToJS
+ GHC.Driver.CpuFeatures
GHC.Driver.DynFlags
GHC.Driver.IncludeSpecs
GHC.Driver.Downsweep
=====================================
docs/users_guide/expected-undocumented-flags.txt
=====================================
@@ -75,6 +75,7 @@
-instantiated-with
-keep-hi-file
-keep-o-file
+-march=native
-n
-no-keep-hi-file
-no-keep-o-file
=====================================
docs/users_guide/using.rst
=====================================
@@ -496,7 +496,9 @@ The available mode flags are:
Print a JSON object describing the CPU features currently enabled for code
generation, together with a set of ``-m...`` flags that reproduce the
effective feature set for the current target.
- Dynamic options such as ``-mavx2`` and ``-mbmi2`` are respected.
+ Dynamic options such as ``-mavx2`` and ``-mbmi2`` are respected, so this flag
+ can also be used to inspect which features :ghc-flag:`-march=native` detected
+ and enabled.
.. ghc-flag:: --print-debug-on
:shortdesc: print whether GHC was built with ``-DDEBUG``
@@ -1854,6 +1856,34 @@ Some flags only make sense for particular target platforms.
so this flag has no effect when used with the :ref:`native code generator <native-code-gen>`
or the :ref:`LLVM backend <llvm-code-gen>`.
+.. ghc-flag:: -march=native
+ :shortdesc: (x86 only) Enable all CPU features supported by the host
+ :type: dynamic
+ :category: platform-options
+
+ (x86/x86_64 only) Probe the CPU of the machine running GHC and enable all of
+ the corresponding ``-m...`` CPU-feature options automatically (for example
+ ``-msse4.2``, ``-mavx2``, ``-mbmi2``, ``-mfma``). The detected features apply
+ to both the :ref:`native code generator <native-code-gen>` and the
+ :ref:`LLVM backend <llvm-code-gen>`.
+
+ The detected features are enabled *in addition* to any CPU-feature flags you
+ pass explicitly, regardless of their order on the command line; ``-march=native``
+ never disables a feature.
+
+ The features that were detected and enabled can be inspected with
+ :ghc-flag:`--print-enabled-cpu-features`.
+
+ .. warning::
+
+ Code compiled with ``-march=native`` may use instructions that are not
+ available on other CPUs, and is therefore not portable to a different
+ machine.
+
+ Only x86 and x86_64 targets are supported so far; the flag is rejected on
+ other targets. It is also rejected when cross-compiling, since the host CPU
+ is then unrelated to the target.
+
Haddock
-------
=====================================
testsuite/tests/codeGen/should_gen_asm/all.T
=====================================
@@ -17,6 +17,11 @@ test('msse-option-order', [unless(arch('x86_64') or arch('i386'), skip),
when(unregisterised(), skip)], compile_grep_asm, ['hs', False, '-msse4.2 -msse2'])
test('mavx-should-enable-popcnt', [unless(arch('x86_64') or arch('i386'), skip),
when(unregisterised(), skip)], compile_grep_asm, ['hs', False, '-mavx'])
+# -march=native probes the host CPU, so gate on the host actually having SSE4.2
+# (have_cpu_feature reports nothing under cross, skipping the test there too).
+test('march-native-enables-popcnt',
+ [unless((arch('x86_64') or arch('i386')) and have_cpu_feature('sse4_2'), skip),
+ when(unregisterised(), skip)], compile_grep_asm, ['hs', False, '-march=native'])
test('avx512-int64-mul', [unless(arch('x86_64'), skip),
when(unregisterised(), skip)], compile_grep_asm, ['hs', True, '-mavx512dq -mavx512vl'])
test('avx512-int64-minmax', [unless(arch('x86_64'), skip),
=====================================
testsuite/tests/codeGen/should_gen_asm/march-native-enables-popcnt.asm
=====================================
@@ -0,0 +1 @@
+popcnt(?![0-9])
\ No newline at end of file
=====================================
testsuite/tests/codeGen/should_gen_asm/march-native-enables-popcnt.hs
=====================================
@@ -0,0 +1,11 @@
+-- `-march=native` enables the host's CPU features. On a host with SSE4.2
+-- (gated in all.T via have_cpu_feature) this makes popCount compile to a
+-- `popcnt` instruction rather than the SSE2-baseline software fallback.
+import Data.Bits
+
+{-# NOINLINE foo #-}
+foo :: Int -> Int
+foo x = 1 + popCount x
+
+main :: IO ()
+main = print (foo 42)
=====================================
testsuite/tests/driver/all.T
=====================================
@@ -7,6 +7,12 @@ def normalise_unknown_flag(msg):
m = re.search(r'unrecognised flag: \S+', msg)
return m.group(0) + '\n' if m else msg
+def normalise_march_native_error(msg):
+ # Keep only the stable '-march=native ...' diagnostic; the program-name
+ # prefix and any usage trailer vary across configurations.
+ m = re.search(r'-march=native is [^\n]+', msg)
+ return m.group(0) + '\n' if m else msg
+
test('driver011', [extra_files(['A011.hs'])], makefile_test, ['test011'])
test('driver012', [extra_files(['A012.hs'])], makefile_test, ['test012'])
@@ -265,6 +271,42 @@ test('print_enabled_cpu_features_unknown_flag',
run_command,
['{compiler} -mavx22 --print-enabled-cpu-features'])
+# -march=native enables at least the x86_64 baseline (SSE2). The full feature
+# set is host-dependent, so we only assert the always-present baseline.
+test('march_native',
+ [unless(arch('x86_64') or arch('i386'), skip)],
+ run_command,
+ ['{compiler} -march=native --print-enabled-cpu-features | grep -o SSE2'])
+
+# On non-x86 targets -march=native must be rejected.
+test('march_native_unsupported_arch',
+ [when(arch('x86_64') or arch('i386'), skip),
+ normalise_errmsg_fun(normalise_march_native_error), exit_code(1)],
+ run_command,
+ ['{compiler} -march=native --print-enabled-cpu-features'])
+
+# -march=native is additive: its feature set is a superset of the default set.
+# We extract the "features" arrays with and without the flag and assert that no
+# baseline feature is dropped (comm -23 prints baseline-only entries; expect none).
+# This avoids hard-coding the host-specific feature set.
+test('march_native_superset',
+ [unless(arch('x86_64') or arch('i386'), skip)],
+ run_command,
+ ['{compiler} --print-enabled-cpu-features | '
+ 'sed \'s/.*"features":\\[//;s/].*//;s/"//g\' | tr \',\' \'\\n\' | sort > base.txt && '
+ '{compiler} -march=native --print-enabled-cpu-features | '
+ 'sed \'s/.*"features":\\[//;s/].*//;s/"//g\' | tr \',\' \'\\n\' | sort > native.txt && '
+ 'comm -23 base.txt native.txt'])
+
+# -march=native is additive with explicit -m flags, regardless of order: an
+# explicitly requested feature (here AVX2, forced on independent of the host) is
+# still present whether the flag comes before or after -march=native.
+test('march_native_additive',
+ [unless(arch('x86_64') or arch('i386'), skip)],
+ run_command,
+ ['{compiler} -mavx2 -march=native --print-enabled-cpu-features | grep -o AVX2 && '
+ '{compiler} -march=native -mavx2 --print-enabled-cpu-features | grep -o AVX2'])
+
test('T10219', normal, run_command,
# `-x hspp` in make mode should work.
# Note: need to specify `-x hspp` before the filename.
=====================================
testsuite/tests/driver/march_native.stdout
=====================================
@@ -0,0 +1 @@
+SSE2
=====================================
testsuite/tests/driver/march_native_additive.stdout
=====================================
@@ -0,0 +1,2 @@
+AVX2
+AVX2
=====================================
testsuite/tests/driver/march_native_unsupported_arch.stderr
=====================================
@@ -0,0 +1 @@
+-march=native is not supported on this target yet (only x86 and x86_64 are supported so far)
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/877a0b0536a95a5924dcb337ffd9b17…
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[Git][ghc/ghc][wip/sjakobi/testsuite-bignum-detection] testsuite: detect fast bignum via ghc-internal, not removed ghc-bignum
by Simon Jakobi (＠sjakobi2) 06 Jun '26
by Simon Jakobi (＠sjakobi2) 06 Jun '26
06 Jun '26
Simon Jakobi pushed to branch wip/sjakobi/testsuite-bignum-detection at Glasgow Haskell Compiler / GHC
Commits:
90d7915f by Simon Jakobi at 2026-06-06T17:48:20+02:00
testsuite: detect fast bignum via ghc-internal, not removed ghc-bignum
The ghc-bignum package was merged into ghc-internal, so the BIGNUM_GMP
probe in test.mk ran `ghc-pkg field ghc-bignum exposed-modules`, which
fails with "cannot find package ghc-bignum". That error went to stderr
and leaked into the captured stderr of every makefile_test, causing
spurious [bad stderr] failures across the suite. The probe also silently
returned empty, so config.have_fast_bignum was wrongly False even on GMP
builds.
Probe ghc-internal's extra-libraries for the gmp library instead: the
GMP backend module is an other-module (not exposed), but GMP_LIBS adds
gmp to extra-libraries only on a GMP build, so this distinguishes the
backends. Redirect stderr to keep any future missing-package error off
the harness's stderr.
This also removes a stale comment as per suggestion from hsyl20.
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
1 changed file:
- testsuite/mk/test.mk
Changes:
=====================================
testsuite/mk/test.mk
=====================================
@@ -109,9 +109,11 @@ endif
HAVE_GDB := $(shell if gdb --version > /dev/null 2> /dev/null; then echo YES; else echo NO; fi)
HAVE_READELF := $(shell if readelf --version > /dev/null 2> /dev/null; then echo YES; else echo NO; fi)
-# we need a better way to find which backend is selected and if --check flag is
-# used
-BIGNUM_GMP := $(shell "$(GHC_PKG)" field ghc-bignum exposed-modules | grep GMP)
+# Detect whether the fast (GMP) bignum backend is in use. The GMP backend module
+# in ghc-internal is hidden, so we look instead for the gmp library it links
+# against: GMP_LIBS adds gmp to ghc-internal's extra-libraries only on a GMP
+# build.
+BIGNUM_GMP := $(shell "$(GHC_PKG)" field ghc-internal extra-libraries 2>/dev/null | grep gmp)
ifeq "$(filter thr, $(GhcRTSWays))" "thr"
RUNTEST_OPTS += -e config.ghc_with_threaded_rts=True
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/90d7915fce76509c913dbe05fc9add2…
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[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL] 9 commits: hadrian: Fix ghc-in-ghci flavour: use targetSupportsSharedLibs not targetSupportsThreadedRts
by Sven Tennie (＠supersven) 06 Jun '26
by Sven Tennie (＠supersven) 06 Jun '26
06 Jun '26
Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL at Glasgow Haskell Compiler / GHC
Commits:
e37b92d3 by Sven Tennie at 2026-06-06T14:10:43+00:00
hadrian: Fix ghc-in-ghci flavour: use targetSupportsSharedLibs not targetSupportsThreadedRts
Dynamic way requires shared lib support, not threaded RTS support.
- - - - -
70d2c50d by Sven Tennie at 2026-06-06T14:12:13+00:00
hadrian: Revert superfluous whitespace change in Validate.hs
- - - - -
077791e0 by Sven Tennie at 2026-06-06T14:16:22+00:00
hadrian: Restore original way order in defaultLibraryWays
- - - - -
dac4e3cc by Sven Tennie at 2026-06-06T14:19:30+00:00
hadrian: Restore x86 variable name in rtsPackageArgs
- - - - -
1932d641 by Sven Tennie at 2026-06-06T14:29:09+00:00
hadrian: Restore original import order and list order to reduce diff noise
- - - - -
f53c009a by Sven Tennie at 2026-06-06T14:29:46+00:00
hadrian: Remove spurious blank lines to reduce diff noise
- - - - -
de86be23 by Sven Tennie at 2026-06-06T14:36:39+00:00
hadrian: Eliminate duplicate parsePath call in Compile.hs
- - - - -
210ac3ff by Sven Tennie at 2026-06-06T15:12:17+00:00
hadrian: use staged isOsxTarget and drop stale cross exception in splitSectionsArgs
Replace manual `getStage` + `isOsxTarget stage` with `staged isOsxTarget`.
Drop `cross || notSt0` in favour of plain `notSt0`: the cross exception
was valid when Stage0 cross-compiled binaries shipped to the target, but
Stage0 packages always run on the host, so the exception no longer applies.
- - - - -
78502733 by Sven Tennie at 2026-06-06T15:15:43+00:00
hadrian: drop stale cross exception in ghcWithInterpreter
The `stage >= Stage1 || is_cross` condition enabled GHCi for Stage0 when
cross compiling. This was valid when Stage0 cross-compiled binaries shipped
to the target, but Stage0 packages always run on the host and are never
shipped, so the exception no longer applies.
Drop `is_cross` and simplify to `stage >= Stage1`.
- - - - -
10 changed files:
- hadrian/src/Expression.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Builders/SplitSections.hs
- hadrian/src/Settings/Default.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Validate.hs
- hadrian/src/Settings/Packages.hs
- hadrian/src/Settings/Program.hs
Changes:
=====================================
hadrian/src/Expression.hs
=====================================
@@ -52,7 +52,6 @@ package p = (p ==) <$> getPackage
packageOneOf :: [Package] -> Predicate
packageOneOf ps = (`elem` ps) <$> getPackage
-
-- | This type class allows the user to construct both precise builder
-- predicates, such as @builder (Ghc CompileHs Stage1)@, as well as predicates
-- covering a set of similar builders. For example, @builder (Ghc CompileHs)@
=====================================
hadrian/src/Rules/Compile.hs
=====================================
@@ -62,12 +62,11 @@ compilePackage rs = do
forM_ wayPats $ \wayPat -> ( root -/- ("**/build/**/*." ++ wayPat ++ "dyn_o") :& root -/- ("**/build/**/*." ++ wayPat ++ "dyn_hi") :& Nil )
&%> \ ( dyn_o :& _dyn_hi :& _ ) -> do
- (BuildPath _root stage _path _o)
+ b@(BuildPath _root stage _path _o)
<- parsePath (parseBuildObject root) "<object file path parser>" dyn_o
p <- targetSupportsSharedLibs stage
if p
then do
- b <- parsePath (parseBuildObject root) "<object file path parser>" dyn_o
let ctx = objectContext b
way = removeWayUnit Dynamic $ C.way ctx
-- We `need` ".o/.hi" because GHC is called with `-dynamic-too`
=====================================
hadrian/src/Rules/Generate.hs
=====================================
@@ -5,6 +5,7 @@ module Rules.Generate (
) where
import Development.Shake.FilePath
+import qualified Data.Set as Set
import Base
import qualified Context
import Expression
@@ -12,7 +13,6 @@ import Hadrian.Oracles.TextFile (lookupStageBuildConfig)
import Oracles.Flag hiding (arSupportsAtFile, arSupportsDashL)
import Oracles.ModuleFiles
import Oracles.Setting
-import Settings.Program (ghcWithInterpreter)
import Hadrian.Haskell.Cabal.Type (PackageData(version))
import Hadrian.Haskell.Cabal
import Hadrian.Oracles.Cabal (readPackageData)
@@ -23,7 +23,7 @@ import Utilities
import GHC.Toolchain as Toolchain hiding (HsCpp(HsCpp))
import GHC.Platform.ArchOS
-import qualified Data.Set as Set
+import Settings.Program (ghcWithInterpreter)
import UserSettings (finalStage)
-- | Track this file to rebuild generated files whenever it changes.
=====================================
hadrian/src/Settings/Builders/RunTest.hs
=====================================
@@ -343,7 +343,6 @@ getTestArgs = do
hp2ps_path <- expr $ getTestExePath testGhc hp2ps
hpc_path <- expr $ getTestExePath testGhc hpc
-
-- the testsuite driver will itself tell us if we need to generate the docs target
-- So we always pass the haddock path if the hadrian configuration allows us to build
-- docs
=====================================
hadrian/src/Settings/Builders/SplitSections.hs
=====================================
@@ -12,19 +12,17 @@ import Flavour.Type
splitSectionsArgs :: Args
splitSectionsArgs = do
pkg <- getPackage
- stage <- getStage
- osx <- expr (isOsxTarget stage)
- cross <- expr $ flag CrossCompiling
+ osx <- staged isOsxTarget
notSt0 <- notStage0
flav <- expr flavour
if ( ghcSplitSections flav
-- Flavour enables split-sections
&& not osx
-- OS X doesn't support split sections
- && (cross || notSt0)
+ && notSt0
-- Disable for stage 0 because we aren't going to ship
-- the resulting binaries and consequently there is no
- -- reason to minimize size. Unless cross compiling.
+ -- reason to minimize size.
&& (pkg /= ghc)
-- Disable section splitting for the GHC library.
-- It takes too long and there is little benefit.
=====================================
hadrian/src/Settings/Default.hs
=====================================
@@ -71,9 +71,9 @@ stageBootPackages = return
, hsc2hs
, compareSizes
, deriveConstants
+ , genapply
, genprimopcode
, unlit
- , genapply
]
-- | Packages built in 'Stage0' by default. You can change this in "UserSettings".
@@ -220,7 +220,7 @@ defaultLibraryWays = do
mconcat
[ pure [vanilla]
, notStage0 ? pure [profiling]
- , notStage0 ? targetSupportsSharedLibs stage ? pure [profilingDynamic, dynamic]
+ , notStage0 ? targetSupportsSharedLibs stage ? pure [dynamic, profilingDynamic]
]
-- | Default build ways for the RTS.
=====================================
hadrian/src/Settings/Flavours/GhcInGhci.hs
=====================================
@@ -15,7 +15,7 @@ ghcInGhciFlavour = disableProfiledLibs $ defaultFlavour
Set.fromList
<$> mconcat
[ pure [vanilla]
- , staged targetSupportsThreadedRts ? pure [dynamic]
+ , staged targetSupportsSharedLibs ? pure [dynamic]
]
}
=====================================
hadrian/src/Settings/Flavours/Validate.hs
=====================================
@@ -1,6 +1,7 @@
module Settings.Flavours.Validate (validateFlavour, slowValidateFlavour,
quickValidateFlavour) where
+
import Expression
import Flavour
import {-# SOURCE #-} Settings.Default
=====================================
hadrian/src/Settings/Packages.hs
=====================================
@@ -1,6 +1,5 @@
module Settings.Packages (packageArgs) where
-import Data.Version.Extra
import Expression
import Flavour
import Oracles.Setting
@@ -8,11 +7,12 @@ import Oracles.Flag
import Packages
import Settings
import Settings.Builders.Common (wayCcArgs)
-import Settings.Program (ghcWithInterpreter)
import qualified GHC.Toolchain.Library as Lib
import GHC.Toolchain.Target
import GHC.Platform.ArchOS
+import Data.Version.Extra
+import Settings.Program (ghcWithInterpreter)
-- | Package-specific command-line arguments.
packageArgs :: Args
@@ -312,8 +312,7 @@ rtsPackageArgs = package rts ? do
predStage stage
else
stage
- -- Figure out if the host (the arch where GHC is running on) is x86
- x86Host <- queryTarget stage' (\ tgt -> archOS_arch (tgtArchOs tgt) `elem` [ ArchX86, ArchX86_64 ])
+ x86 <- queryTarget stage' (\ tgt -> archOS_arch (tgtArchOs tgt) `elem` [ ArchX86, ArchX86_64 ])
-- Arguments passed to GHC when compiling C and .cmm sources.
let ghcArgs = mconcat
@@ -330,11 +329,11 @@ rtsPackageArgs = package rts ? do
--
-- In particular, we **do not** pass -mavx when compiling
-- AutoApply_V16.cmm, as that would lock out targets with SSE2 but not AVX.
- , inputs ["**/AutoApply_V32.cmm"] ? pure [ "-mavx2" | x86Host ]
- , inputs ["**/AutoApply_V64.cmm"] ? pure [ "-mavx512f" | x86Host ]
+ , inputs ["**/AutoApply_V32.cmm"] ? pure [ "-mavx2" | x86 ]
+ , inputs ["**/AutoApply_V64.cmm"] ? pure [ "-mavx512f" | x86 ]
- , inputs ["**/Jumps_V32.cmm"] ? pure [ "-mavx2" | x86Host ]
- , inputs ["**/Jumps_V64.cmm"] ? pure [ "-mavx512f" | x86Host ]
+ , inputs ["**/Jumps_V32.cmm"] ? pure [ "-mavx2" | x86 ]
+ , inputs ["**/Jumps_V64.cmm"] ? pure [ "-mavx512f" | x86 ]
]
let cArgs = mconcat
@@ -379,11 +378,11 @@ rtsPackageArgs = package rts ? do
, inputs ["**/Evac.c", "**/Evac_thr.c"] ? arg "-funroll-loops"
-- See Note [AutoApply.cmm for vectors] in genapply/Main.hs
- , inputs ["**/AutoApply_V32.c"] ? pure [ "-mavx2" | x86Host ]
- , inputs ["**/AutoApply_V64.c"] ? pure [ "-mavx512f" | x86Host ]
+ , inputs ["**/AutoApply_V32.c"] ? pure [ "-mavx2" | x86 ]
+ , inputs ["**/AutoApply_V64.c"] ? pure [ "-mavx512f" | x86 ]
- , inputs ["**/Jumps_V32.c"] ? pure [ "-mavx2" | x86Host ]
- , inputs ["**/Jumps_V64.c"] ? pure [ "-mavx512f" | x86Host ]
+ , inputs ["**/Jumps_V32.c"] ? pure [ "-mavx2" | x86 ]
+ , inputs ["**/Jumps_V64.c"] ? pure [ "-mavx512f" | x86 ]
-- emits warnings about call-clobbered registers on x86_64
, inputs [ "**/StgCRun.c"
=====================================
hadrian/src/Settings/Program.hs
=====================================
@@ -6,7 +6,6 @@ module Settings.Program
import Base
import Context
import Oracles.Flavour
-import Oracles.Flag
import Packages
import GHC.Platform.ArchOS
@@ -31,16 +30,11 @@ programContext stage pkg = do
notStage0 (Stage0 {}) = False
notStage0 _ = True
--- | When cross compiling, enable for stage0 to get ghci
--- support. But when not cross compiling, disable for
--- stage0, otherwise we introduce extra dependencies
--- like haskeline etc, and mixing stageBoot/stage0 libs
--- can cause extra trouble (e.g. #25406)
---
--- Also checks whether the target supports GHCi.
+-- | Check whether the target supports GHCi.
+-- Disable for stage 0: it would introduce extra dependencies like haskeline,
+-- and mixing stageBoot/stage0 libs can cause trouble (e.g. #25406).
ghcWithInterpreter :: Stage -> Action Bool
ghcWithInterpreter stage = do
- is_cross <- flag CrossCompiling
goodOs <- anyTargetOs stage [ OSMinGW32, OSLinux, OSSolaris2
, OSFreeBSD, OSDragonFly, OSNetBSD, OSOpenBSD
, OSDarwin, OSKFreeBSD
@@ -58,6 +52,4 @@ ghcWithInterpreter stage = do
-- fall back on dynamic linking:
dynamicGhcProgs <- askDynGhcPrograms stage
- -- Maybe this should just be false for cross compilers. But for now
- -- I've kept the old behaviour where it will say yes. (See #25939)
- return $ ((goodOs && goodArch) || dynamicGhcProgs) && (stage >= Stage1 || is_cross)
+ return $ ((goodOs && goodArch) || dynamicGhcProgs) && stage >= Stage1
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/7c66c03566d20d8d2896369f6dc507…
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[Git][ghc/ghc][wip/reduce-type-in-stg] 140 commits: rts: add a few missing i386 relocations in the rts linker
by Jaro Reinders (＠jaro) 06 Jun '26
by Jaro Reinders (＠jaro) 06 Jun '26
06 Jun '26
Jaro Reinders pushed to branch wip/reduce-type-in-stg at Glasgow Haskell Compiler / GHC
Commits:
04d143c0 by Luite Stegeman at 2026-04-21T14:05:33-04:00
rts: add a few missing i386 relocations in the rts linker
- - - - -
014087e7 by Luite Stegeman at 2026-04-21T14:05:34-04:00
CodeOutput: Fix finalizers on multiple platforms
- ELF platforms: emit .fini_array section
- wasm32/Darwin: emit initializer with __cxa_atexit call
- Windows: use -Wl,--whole-archive to prevent dropping finalizer symbols
- rts linker: fix crash/assertion failure unloading objects with finalizers
fixes #27072
- - - - -
915bba6f by Simon Jakobi at 2026-04-21T14:06:16-04:00
Add regression test for #10531
Closes #10531.
- - - - -
86a646a6 by Andreas Klebinger at 2026-04-22T13:00:05-04:00
Revert use of generic instances for compiler time perf reasons.
Revert "Derive Semigroup/Monoid for instances believed could be derived in #25871"
This reverts commit 11a04cbb221cc404fe00d65d7c951558ede4caa9.
Revert "add Ghc.Data.Pair deriving"
This reverts commit 15d9ce449e1be8c01b89fd39bdf1e700ea7d1dce.
- - - - -
bc9ee1cf by Wen Kokke at 2026-04-22T13:00:51-04:00
hadrian: Fix docs to remove static flavour
In 638f6548, the static flavour was turned into into the fully_static
flavour transformer. However, this commit did not update flavours.md.
- - - - -
cc9cc6d5 by Cheng Shao at 2026-04-23T09:40:46+00:00
configure: bump LlvmMaxVersion to 23
This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases.
- - - - -
2ea7ef8e by Cheng Shao at 2026-04-23T09:46:26+00:00
changelog: add llvm 22.x support
- - - - -
5574ee10 by Cheng Shao at 2026-04-24T08:24:30-04:00
compiler: avoid unused temporary `appendFS` operands
This patch fixes unused temporary `appendFS` operands in the codebase
that are retained in the `FastString` table after concatenation.
Rewrite rules are added so that if an operand is
`fsLit`/`mkFastString`, the `appendFS` application is rewritten to
append the `ShortByteString` operands first. The patch also fixes
`sconcat` behavior to align with `mconcat` for the same reason. Fixes #27205.
- - - - -
4ed78760 by mangoiv at 2026-04-24T08:25:13-04:00
contributing: adjust MR template to be less verbose
- MR template only shows text that is relevant for submissiong
- MR template was rewritten so it's readable from a user's and reviewer's
perspective
Resolves #27165
Co-Authored-By: @sheaf
- - - - -
87db83e2 by Cheng Shao at 2026-04-24T14:37:21-04:00
ci: bump freebsd boot ghc to 9.10.3
This commit bumps freebsd boot ghc to 9.10.3 to align with other
platforms and prevent outdated boot libs in boot ghc to block the
freebsd job.
- - - - -
17e3a0b7 by Cheng Shao at 2026-04-24T14:37:21-04:00
compiler: improve Binary instance of Array
This patch improves the `Binary` instance of `Array`:
- We no longer allocate intermediate lists. When serializing an
`Array`, we iterate over the elements directly; when deserializing
it, we allocate the result `Array` and fill it in a loop.
- Now we only serialize the array bounds tuple; the length field is
not needed.
Closes #27109.
- - - - -
2d30f7d3 by sheaf at 2026-04-24T14:38:23-04:00
Vendor mini-QuickCheck for testsuite
This commit extracts the vendored QuickCheck implementation from the
foundation testsuite to make it more broadly available in the GHC
testsuite, and makes use of it in the simd006 test (which also used
a vendored QuickCheck implementation).
On the way, we update the linear congruential generator to avoid the
shortcoming of only generating 31 bit large numbers.
Fixes #25990 and #25969.
- - - - -
1350271b by sheaf at 2026-04-27T09:32:53-04:00
Ensure TcM plugins are only initialised once
This commit ensures we keep TcM plugins (typechecker plugins,
defaulting plugins and hole fit plugins) running all the way through
desugaring, instead of stopping them at the end of typechecking.
To do this, the "stop" actions of TcPlugin and DefaultingPlugin are
split into two: one for the "post-typecheck" action, and one for the
final shutdown action (after desugaring).
This allows the plugins to be invoked by the pattern match checker
(during desugaring) without having to be repeatedly re-initialised and
stopped, fixing #26839.
In the process, this commit modifies 'initTc' and 'initTcInteractive',
adding an extra argument that describes whether to start/stop the 'TcM'
plugins.
See Note [Stop TcM plugins after desugaring] for an overview.
- - - - -
42549222 by sheaf at 2026-04-27T09:33:50-04:00
Hadrian: add --keep-response-files
This commit adds a Hadrian flag that allows response files to be
retained. This is useful for debugging a failing Hadrian command line.
- - - - -
40564e8d by sheaf at 2026-04-27T09:34:46-04:00
hadrian/build-cabal.bat: fix build on Windows
Commit 8cb99552f6 introduced a warning for a missing package index.
However, the logic was faulty on Windows: the piping was broken, and
"remote-repo-cache:" was being interpreted as a (malformed) drive letter,
leading to the error:
The filename, directory name, or volume label syntax is incorrect.
This commit fixes that by using a temporary file instead of piping.
- - - - -
14bc71e4 by Sven Tennie at 2026-04-28T13:22:47-04:00
ghc: Distinguish between having an interpreter and having an internal one
Actually, these are related but different things:
- ghc can run an interpreter (either internal or external)
- ghc is compiled with an internal interpreter
Splitting the logic solves compiler warnings and expresses the intent
better.
- - - - -
df691563 by Vladislav Zavialov at 2026-04-28T13:23:29-04:00
Refactor HsWildCardTy to use HoleKind (#27111)
The payload of this patch is that the extension fields of HsWildCardTy
and HsHole now match:
type instance XWildCardTy Ghc{Ps,Rn} = HoleKind
type instance XHole Ghc{Ps,Rn} = HoleKind
This is progress towards unification of HsExpr and HsType.
Test case: T25121_status
In addition to that, exact-printing of infix holes is fixed.
Test case: PprInfixHole
- - - - -
f3485446 by fendor at 2026-04-28T13:24:12-04:00
Expose startupHpc as an rts symbol
- - - - -
28f07d70 by fendor at 2026-04-28T13:24:12-04:00
Make HPC work with bytecode interpreter
Add support to generate .tix files from bytecode objects and the
bytecode interpreter.
Conceptually, we insert HPC ticks into the bytecode similar to how we insert
breakpoints.
HPC and breakpoints do not share the same tick array but we use a separate
tick-array for hpc/breakpoint ticks during bytecode generation.
We teach the bytecode interpreter to handle hpc ticks.
The implementation is quite trivial, simply increment the counter in the
global hpc_ticks array for the respective module.
This hpc_ticks array is generated as part of the `CStub`, so we can rely
on it existing.
A tricky bit is "registering" a bytecode object for HPC instrumentation.
In the compiled case, this is achieved via CStub and initializer/finalizers
`.init` sections which are called when the executable is run.
After the initializers have been invoked, which is before `hs_init_ghc`,
we then call `startup_hpc` in `hs_init_ghc` iff any modules were "registered"
for hpc instrumentation via `hs_hpc_module`.
Since bytecode objects are loaded after starting up GHCi, this workflow
doesn't work for supporting `hpc` and the `hpc` run-time is never
started, even if a module is added for instrumentation.
We fix this issue by employing the same technique as is for `SptEntry`s:
* We introduce a new field to `CompiledByteCode`, called `ByteCodeHpcInfo`
which contains enough information to call `hs_hpc_module`, allowing us to
register the module for `hpc` instrumentation`.
* After registering the module, we unconditionally call `startupHpc`, to make
sure the .tix file is written.
Calling `startupHpc` multiple times is safe.
Calling `hs_hpc_module` multiple times for the same module is also safe.
If we didn't register the hpc module in this way, evaluating a bytecode object
instrumented with `-fhpc` without registering it in the `hpc` run-time will
simply not generate any `.tix` files for this bytecode object.
However, this shouldn't happen if everything is set up correctly.
Closes #27036
- - - - -
950879f0 by Vladislav Zavialov at 2026-04-28T13:24:55-04:00
Move NamespaceSpecifier from x-fields into the AST proper (#26678)
This refactoring moves NamespaceSpecifier out of extension fields and into the
AST proper, as it is part of the user-written source, and is not pass-specific.
Summary of changes:
* Move NamespaceSpecifier from GHC/Hs/Basic.hs to Language/Haskell/Syntax/ImpExp.hs
and parameterise it by the compiler pass, creating the necessary extension points
* Move NamespaceSpecifier out of XFixitySig into FixitySig
* Move NamespaceSpecifier out of XIEThingAll (IEThingAllExt) into IEThingAll
* Move NamespaceSpecifier out of XIEWholeNamespace (IEWholeNamespaceExt) into IEWholeNamespace
This is a pure refactoring with no change in behaviour.
- - - - -
9797052b by Simon Peyton Jones at 2026-04-28T13:25:37-04:00
Fix assertion check in checkResultTy
As #27210 shows, the assertion was a little bit too eager.
I refactored a bit by moving some code from GHC.Tc.Gen.App
to GHC.Tc.Utils.Unify; see the new function tcSubTypeApp,
which replaces tcSubTypeDS
- - - - -
9f85f034 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Make cmm 'import "package" name;' syntax use consistent label types
There is a little-used syntactic form in cmm imports:
import "package" foo;
Which means to import foo from the given package (unit id, specified as
a string). This syntax is somewhat reminiscent of GHC's package import
extension.
This syntax form is not used in the rts cmm code, nor any of the boot
libraries. It may not be used at all. Unclear.
Change the kind of CLabel this syntax generates to be consistent with
the others. The other cmm imports use ForeignLabel with
ForeignLabelInExternalPackage. For some reason this form was using
CmmLabel. Change that to also be ForeignLabel but with
ForeignLabelInPackage. This specifies a specific package, rather
than an unnamed external package.
- - - - -
a811f68f by Duncan Coutts at 2026-04-30T04:52:42-04:00
Change default cmm import statements to be internal
Previously a cmm statement like:
import foo;
meant to expect the symbol from a different shared library than the
current one.
Now it means to expect the symbol from the same shared library as the
current one. We'll add explicit syntax to indicate that it's a foreign
import. Most existing uses are in fact intenal (rts to rts), so few
imports will need to be annotated foreign. Examples would include cmm
code in libraries (other than the rts) that need to access RTS APIs.
In practice, this makes no difference whatsoever at the moment on any
platform other than windows (where building Haskell libs as shared libs
does not fully work yet), since the 'labelDynamic' treats all such
labels as foreign, irrespective of the foreign label source.
- - - - -
17fe5d1d by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm import syntax 'import DATA foo;' as better name for CLOSURE
The existing syntax is:
import CLOSURE foo;
The new syntax is
import DATA foo;
This means to interpret the symbol foo as refering to data (i.e. a
global constant or variable) rather than to code (a function). The
historical syntax for this uses CLOSURE, which is rather misleading.
Presumably this was done to avoid introducing new reserved words.
Be less squemish about new reserved words and add DATA and use that.
Keep the existing CLOSURE syntax as an alias for compatibility.
- - - - -
3a530d68 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm 'import extern name;' syntax
Since the default for cmm imports is now for symbols within the same
shared object, we need a way to indicate we want a symbol from an
external shared object:
import extern foo; -- for a function
import extern DATA foo; -- for data
This adds a new reserved word 'extern'.
We don't expect to have to use this much. Most cmm imports are
intra-DSO.
This makes no difference currently on ELF and MachO platforms, but does
make a difference to the linking conventions on PE (Windows).
In future it's plausible we could take make distinctions on ELF or
MachO, so it's worth trying to get it right. Windows can be the guinea
pig.
- - - - -
2b8e44c7 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm syntax 'import "package" DATA foo;' for completeness
We already have:
import DATA foo; -- for data imports
import "package" foo; -- for imports from a given unitid
There's no reason not to have both at once:
import "package" DATA foo;
So add that.
- - - - -
ee05e5cc by Duncan Coutts at 2026-04-30T04:52:42-04:00
Improve the commentary for the cmm import grammar.
AFAIK, this is the only place where GHC-style Cmm syntax is documented.
- - - - -
b35946ad by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add a changelog.d entry for the .cmm import syntax changes
- - - - -
d59b7c71 by Wolfgang Jeltsch at 2026-04-30T04:53:25-04:00
Move code that uses `GHC.Internal.Text.Read` into `base`
This contribution serves to remove all dependencies on
`GHC.Internal.Text.Read` from within `ghc-internal`, so that the
implementation of `Text.Read` and ultimately more reading-related code
can be moved to `base` as well.
The following things are moved from `ghc-internal` to `base`:
* I/O-related `Read` instances
* Most of the `Numeric` implementation
* The instance `Read ByteOrder`
* The `parseVersion` operation
* The `readConstr` operation
Metric Increase:
LinkableUsage01
T9198
T12425
T13035
T13820
T18140
- - - - -
5bd6a964 by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00
New rts Message to {set,unset} TSO flags
This commit introduces stg_MSG_SET_TSO_FLAG_info and
stg_MSG_UNSET_TSO_FLAG_info, which allows setting flags of a TSO other
than yourself.
This is especially useful/necessary to set breakpoints and toggle
breakpoints of different threads, which is needed to safely implement
features like pausing, toggling step-out, toggling step-in per thread,
etc.
Fixes #27131
-------------------------
Metric Decrease:
T3294
-------------------------
- - - - -
ce97fd3e by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00
test: Add test setting another TSO's flags
Introduces a test that runs on two capabilities. The main thread running
on Capability 0 sets the flags on a TSO running on Capability 1.
The TSO from Capability 1 itself checks whether its flags were set and
reports that back.
This validates that the RTS messages for setting TSO flags work, even if
it doesn't test a harsher scenario with race conditions to exercise why
the message passing is necessary for safely setting another TSO's flags.
Part of #27131
- - - - -
a4ff6315 by David Eichmann at 2026-04-30T04:54:51-04:00
Hadrian: withResponseFile outputs response file when verbodity is Verbose
At the Verbose verbosity, shake will display full commandlines. With the
use of response files, the full command is hidden. That makes it hard to run
the command manually. This commit outputs the contents of the response
file so that that full command can be recreated and also hints at the
use of the --keep-response-files hadrian flag.
- - - - -
cd732ee3 by Duncan Coutts at 2026-04-30T04:54:51-04:00
Use response files for hadrian linking with ghc (support long command lines)
In future support for windows dynamic linking, we expect long command
lines for linking dll files with ghc. Experiments with dynamic linking the
ghc-internal library yielded a link command well over 32kb. We did not
encounter this before for static libs, since we already use ar's @file
feature (if available, which it is for the llvm toolchain).
Co-authored-by: David Eichmann <davide(a)well-typed.com>
- - - - -
3d41368f by Andreas Klebinger at 2026-04-30T04:55:32-04:00
Split GHC.Driver.Main.hs up into multiple components.
This commit splits GHC.Driver.Main into four components:
* GHC.Driver.Main.Compile
* GHC.Driver.Main.Hsc
* GHC.Driver.Main.Interactive
* GHC.Driver.Main.Passes
We might improve that separation further in the future but this should
hopefully make it easier to reason about and work with this part of the
code.
- - - - -
2128ba85 by Cheng Shao at 2026-04-30T04:56:14-04:00
compiler: avoid unique OccNames for internal Names in bytecode objects
This patch improves bytecode object serialization logic by avoiding
the construction of unique `OccName`s when serializing/deserializing
internal `Name`s. Closes #27213.
-------------------------
Metric Decrease:
LinkableUsage01
-------------------------
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e16854c3 by Vladislav Zavialov at 2026-04-30T04:56:57-04:00
Replace GHC 9.16 references with GHC 10.0
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39141343 by Alice Rixte at 2026-05-01T14:09:32+02:00
Add Bounded instances for Double, Float, CDouble and CFloat
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5c4c3bf4 by Sylvain Henry at 2026-05-02T03:39:28-04:00
testsuite: fix flaky foundation Divisible / mulIntMayOflo# tests (#27222)
Since the LCG was widened to 64 bits and the seed randomised per CI run
(commit 2d30f7d3400 "Vendor mini-QuickCheck for testsuite"), two latent
bugs in the foundation test surface stochastically:
* The Divisible property `(x `div` y) * y + (x `mod` y) == x` raises
ArithException(Overflow) when (a, b) = (minBound, -1) for fixed-width
signed Integral types. Split testNumber/testDivisible into Bounded and
unbounded variants and skip just that one pair, gated by
`(minBound :: a) < 0` so unsigned types lose no coverage.
* The `mulIntMayOflo#` test compared raw Int# bit-for-bit, but the primop
is only specified to return 0/non-zero -- the exact non-zero indicator
legitimately differs between backends and inlining choices. Add a
dedicated `testPrimopMayOflo` helper that only compares zero / non-zero.
Also fix the long-standing typo "Dividible" -> "Divisible" in identifiers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
e242ce4f by Sylvain Henry at 2026-05-02T03:39:28-04:00
testsuite: catch and display exceptions in MiniQuickCheck
Exceptions raised while evaluating a property are now caught and reported
as a normal failure (with arguments and seed), instead of aborting the
test.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
3b75cccd by fendor at 2026-05-02T03:40:14-04:00
Fix name of Note [Structure of dep_boot_mods]
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9a9ae4df by Duncan Coutts at 2026-05-05T14:44:37-04:00
Use __attribute__((dllimport)) for external RTS symbol declarations
This is needed to be hygenic about DLL symbol imports and exports.
The attribute is ignored on platforms other than Windows.
Use of the attribute however means that external data symbols do not
have a compile-time constant address (they are loaded using an
indirection). This means we have to adjust the rtsSyms initial linker
table so that it is a local constant in a function, rather than a global
constant. We now define it within a function that pre-populates the
symbol table with the RTS symbols.
- - - - -
2ad3e01e by Duncan Coutts at 2026-05-05T14:44:37-04:00
Fix the rts linker declarations for a few data symbols
and ensure that the (windows only) rts_IOManagerIsWin32Native data
symbol is marked as externally visible.
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8ff4fdb5 by David Eichmann at 2026-05-05T14:44:37-04:00
Hadrian: Disable runtime pseudo relocations for RTS on windows hosts
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96974723 by Teo Camarasu at 2026-05-05T14:45:20-04:00
ghci/TH: refactor to use IORef QState
This is a pure refactor and shouldn't modify semantics at all
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eff6bfaf by Teo Camarasu at 2026-05-05T14:45:20-04:00
iserv: recover/getQ/putQ should behave same as internal interpreter
The internal and external interpreter should behave the same when
handling `recover`, the exeception recovery method of Q.
In practice, they diverge. In case of failure, the internal interpreter
only restores error message state to before the computation, wheras the
external interperter restores error message state *and* the state of putQ/getQ.
As far as I can tell this is a simple mistake in the implementation.
Note [TH recover with -fexternal-interpreter] describes the correct
behaviour but the implementation doesn't mirror this.
This change restores the correct behaviour by keeping the effects of
putQ in the erroring computation.
This is a breaking change since it modifies the behaviour of programs
that rely on recover ignoring putQ from failling computations when used
with the external interpreter. Although I highly doubt anyone relies on
this behaviour.
This divergence was first introduced in d00c308633fe7d216d31a1087e00e63532d87d6d.
As far as I can tell this was unintentional and tha commit was trying to solve a different bug.
Resolves #27022
- - - - -
1cb1d672 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add dynamic trace flags API
This commit adds an API to the RTS (exposed via Rts.h) that allows users to dynamically change the trace flags.
Prior to this commit, users were able to stop and start the profiling and heap profiling timers (via startProfTimer/stopProfTimer and startHeapProfTimer/stopHeapProfTimer).
This extends that functionality to also cover the core event types.
The getTraceFlag/setTraceFlag functions read and write the values of the trace flag cache, which is allocated by Trace.c, rather than modifying the members of RtsFlags.TraceFlags.
This is done under the assumption that the members of RtsFlags should not be modified after RTS initialisation.
Consequently, if the user modifies the trace flags using setTraceFlag, the object returned by getTraceFlags (from base) will not reflect these changes.
The trace flags are not protected by locks of any sort.
Hence, these functions are not thread-safe.
However, the trace flags are not modified by the RTS after initialisation, only read, so the race conditions introduced by one user modifying them are most likely benign.
This PR also puts the trace flag cache in a single global struct, as opposed to a collection of global variables, and changes the types of the individual flags from uint8_t to bool, as these have the same size on both Clang and GCC and are a better semantic match.
Prior to the change to uint8_t, they had type int, see 42c47cd6.
Even with its deprecation in C23, I don't think there should be any issue depending on stdbool.h.
The TRACE_X macros are redefined to access the global struct, with values cast to const bool to ensure they are read-only.
- - - - -
9d54dc94 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Ensure TRACE_X values are used in place of RtsFlags.TraceFlags.X
- - - - -
418d737b by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Fix nonmoving-GC tracing
The current nonmoving-GC tracing functions were written in a different
style from the other tracing functions. They were directly implemented
as, e.g., a traceConcMarkEnd function that called postConcMarkEnd.
The other tracing functions are implemented as, e.g., traceThreadLabel_,
a function that posts the thread label event, and traceThreadLabel, a
macro that checks whether TRACE_scheduler is set. This commit fixes that
implementation, and ensures that the nonmoving-GC tracing functions only
emit events if nonmoving-GC tracing is enabled.
- - - - -
99f4afa4 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add SymI_HasProto for get/setTraceFlag
- - - - -
7e9eb8b9 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add SymI_HasProto for start/endEventLogging
- - - - -
3a3045fb by Wen Kokke at 2026-05-06T09:53:41-04:00
rts: Add changelog entry
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a3b339a4 by Teo Camarasu at 2026-05-06T09:54:25-04:00
interface-stability/base: don't distinguish ws-32
The interface of base is identical when the Word size is 32bits.
Therefore, there is no need to have another file for this case.
So, we delete it.
Step towards: #26752
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eb922183 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Add a rts posix FdWakup utility module
This will be used to implement wakeupIOManager for in-RTS I/O managers.
It provides a notification/wakeup mechanism using FDs, suitable for
situations when a thread is blocked on a set of fds anyway. It uses the
classic self-pipe trick, or equivalently eventfd on supported platforms.
This will initially be used to implement prompt interrupt or shutdown of
the posix ticker thread.
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01b0e233 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Add prompt shutdown to the pthread ticker implementation.
The Linux timerfd ticker monitors a pipe which is used by exitTicker to
ensure a prompt wakeup and shutdown. The pthread ticker lacked this and
so would only exit at the next ticker wakeup (10ms by default).
This patch adds the same mechanism to the pthread ticker.
This changes the pthread ticker from waiting by using nanosleep() to
waiting using either ppoll() or select(), so that it can wait on both
a time and a file descriptor. On Linux at least, a test program to
compare the timing jitter of these APIs shows that using nanpsleep,
ppoll or select makes no statistical difference to the maximum or
average jitter.
This is a step towards unifying the posix ticker implementations, so
that we can have just one portable one (albeit with some limited cpp).
It is also a step towards using the ticker as part of a more general
implementation of wakeUpRts, since this will require a method to wake
the rts from a signal handler context (ctl-c handler).
- - - - -
bc41d646 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Update ticker header commentary
It was antique and didn't apply even to the previous implementation, and
certainly not to the updated one.
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4ed9a386 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Remove the timerfd-based ticker implementation
There does not appear to be any remaining advantage on Linux to using
the timerfd ticker implementation over the portable one (using ppoll on
Linux for precise timing).
The eventfd implementation was originally added at a time when Linux was
still using a signal based implementation. So it made sense at the time.
See (closed) issue #10840.
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97504fa6 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Consolidate to a single posix ticker implementation
Previously we had four implementations, two using signals and two using
threads. Having just one should make behaviour more consistent between
platforms, and should make maintenance easier.
- - - - -
1e60023b by Facundo Domínguez at 2026-05-07T18:01:16-04:00
Generalize so_inline to specify which bindings should be preserved
This commit generalizes the so_inline option of the simple optimizer
so we can indicate with a predicate the specific bindings that should
be kept.
This feature is important for the LiquidHaskell plugin, which relies on the
simple optimizer to make core programs easier to read, but needs to preserve
bindings that are relevant for verification.
See https://gitlab.haskell.org/ghc/ghc/-/issues/24386 for the full discussion.
- - - - -
44cf9cd7 by Wolfgang Jeltsch at 2026-05-12T09:48:18-04:00
Move the `Text.Read` implementation into `base`
- - - - -
4ac3f7d6 by Vladislav Zavialov at 2026-05-12T09:49:03-04:00
EPA: Use AnnParen for tuples and sums
Summary of changes
* Do not use AnnParen in XListTy, replace it with EpToken "[" and "]"
* Specialise AnnParen to tuple/sums by dropping the AnnParensSquare
and keeping only AnnParens and AnnParensHash
* Use AnnParen in XExplicitTuple
* Use AnnParen in XExplicitTupleTy
* Use AnnParen in XTuplePat
* Use AnnParen in XExplicitSum (via AnnExplicitSum)
* Use AnnParen in XSumPat (via EpAnnSumPat)
This is a refactoring with no user-facing changes.
- - - - -
1bdcddec by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add minimal dlltool support to ghc-toolchain
The dlltool is a tool that can create dll import libraries from .def
files. These .def files list the exported symbols of dlls. Its somewhat
like gnu linker scripts, but more limited.
We will need dlltool to build the rts and ghc-internal libraries as DLLs
on Windows. The rts and ghc-internal libraries have a recursive
dependency on each other. Import libraries can be used to resolve
recursive dependencies between dlls. We will use an import library for
the rts when linking the ghc-internal library.
- - - - -
f7fc3770 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add minimal dlltool support into ./configure
Find dlltool, and hopefully support finding it within the bundled llvm
toolchain on windows.
- - - - -
e4e22bfb by Duncan Coutts at 2026-05-12T09:49:48-04:00
Update the default host and target files for dlltool support
- - - - -
5666c8f9 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add dlltool as a hadrian builder
Optional except on windows.
- - - - -
5e14fe3f by Duncan Coutts at 2026-05-12T09:49:48-04:00
Update and generate libHSghc-internal.def from .def.in file
The only symbol that the rts imports from the ghc-internal package now
is init_ghc_hs_iface. So the rts only needs an import lib that defines
that one symbol.
Also, remove the libHSghc-prim.def because it is redundant. The rts no
longer imports anything from ghc-prim.
Keep libHSffi.def for now. We may yet need it once it is clear how
libffi is going to be built/used for ghc.
- - - - -
3d91e4a6 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add rule to build libHSghc-internal.dll.a and link into the rts
On windows only, with dynamic linking.
This is needed because on windows, all symbols in dlls must be resolved.
No dangling symbols allowed. References to external symbols must be
explicit. We resolve this with an import library. We create an import
library for ghc-internal, a .dll.a file. This is a static archive
containing .o files that define the symbols we need, and crucially have
".idata" sections that specifies the symbols the dll imports and from
where.
Note that we do not install this libHSghc-internal.dll.a, and it does
not need to list all the symbols exported by that package. We create a
special purpose import lib and only use it when linking the rts dll, so
it only has to list the symbols that the rts uses from ghc-internal
(which is exactly one symbol: init_ghc_hs_iface).
- - - - -
c8dae539 by Alice Rixte at 2026-05-12T09:50:52-04:00
Script for downloading and copying `base-exports` file
- - - - -
5fab2238 by Wolfgang Jeltsch at 2026-05-12T21:24:27+03:00
Introduce a cache of home module name providers
This contribution introduces to the module graph a cache that maps home
module names to sets of units providing them and changes the finder to
use that cache. This is a performance optimization, especially for
multi-home-unit builds.
The particular changes are as follows:
* In `GHC.Unit.Module.Graph`, `ModuleGraph` is extended with a new
field `mg_home_module_name_providers_map`, exposed as
`mgHomeModuleNameProvidersMap`. This is a cache that assigns to each
home module name the set of IDs of home units that define it.
Operations that construct module graphs are updated such that this
cache stays synchronized.
* In `GHC.Unit.Finder`, `findImportedModule` is changed to pull
`mgHomeModuleNameProvidersMap` from `hsc_mod_graph` and pass it to
`findImportedModuleNoHsc`, which now does not search home units in
arbitrary order but prioritizes those units that the cache mentions
as potential providers of the requested module.
In addition, this contribution adds variants of the two multi-component
compiler performance tests that use 100 units instead of 20, because
with just 20 units the benefits from caching of home module name
providers are still negligible.
The following table shows the total time needed for running both
multi-component tests before and after this contribution and with
different numbers of units:
| # of units | Before | After |
|-----------:|-------:|------:|
| 20 | 0:12 | 0:12 |
| 100 | 0:47 | 0:42 |
| 200 | 3:05 | 2:08 |
Note that there seems to be a general overhead of 12 seconds that is not
attributable to the actual tests, so that the real running times should
be 12 seconds smaller than shown above.
Resolves #27055.
Metric Decrease:
MultiComponentModules
MultiComponentModulesRecomp
Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com>
Co-authored-by: Fendor <fendor(a)posteo.de>
- - - - -
38b76b2f by Cheng Shao at 2026-05-13T17:48:48-04:00
testsuite: mark T22159 as fragile
This patch marks T22159 as fragile on Windows for issue described in #27248.
Before we get to the bottom of those failures, this unblocks newer
Windows runners.
- - - - -
50188615 by Ian Duncan at 2026-05-14T13:45:07+02:00
AArch64: use ASR not LSR for MO_U_Shr at W8/W16
The unsigned right shift (MO_U_Shr) for sub-word widths (W8, W16)
with a variable shift amount was emitting ASR (arithmetic/signed shift
right) after zero-extending with UXTB/UXTH. This should be LSR
(logical/unsigned shift right). After zero-extension the upper bits
happen to be 0 so ASR produces the same result, but it is semantically
wrong and would break if the zero-extension were ever optimized away.
Includes assembly output test (grep for lsr) and runtime test
verifying unsigned right shift of Word8 and Word16 values.
- - - - -
28666fbf by Vladislav Zavialov at 2026-05-19T12:44:05-04:00
Add type families: Tuple, Constraints, Tuple#, Sum# (#27179)
These type families map tuples of types to the corresponding Tuple<N>,
Tuple<N>#, CTuple<N>, and Sum<N># types. Some examples at N=2:
Tuple (Int, Bool) = Tuple2 Int Bool
Constraints (Show a, Eq a) = CTuple2 (Show a) (Eq a)
Tuple# (Int#, Float#) = Tuple2# Int# Float#
Sum# (Int#, Float#) = Sum2# Int# Float#
See GHC Proposal #145 "Non-punning list and tuple syntax".
To make the Sum# instance at N=64 possible, this patch also introduces
the Sum64# constructor declaration and bumps mAX_SUM_SIZE from 63 to 64.
Metric Increase:
ghc_experimental_dir
- - - - -
41c2448b by Wen Kokke at 2026-05-19T12:44:53-04:00
rts: Add IPE event class for -l
This commit adds a new IPE event class to the -l RTS flag.
Previously, IPE events were enabled unconditionally.
However, the IPE events can easily grow to hundreds or thousands of megabytes.
With the new event class you can pass, e.g., -l-I to disable IPE events.
- - - - -
62536551 by Wen Kokke at 2026-05-19T12:44:53-04:00
ghc-internal: Add TraceFlags.traceIPE
- - - - -
e45312d1 by Wen Kokke at 2026-05-19T12:44:53-04:00
testsuite: Add test for TraceFlags.traceIpe
- - - - -
4768d9aa by Wen Kokke at 2026-05-19T12:44:53-04:00
ghc-internal: Add DebugFlags.ipe
- - - - -
bc1b5c69 by Wen Kokke at 2026-05-19T12:44:53-04:00
testsuite: Add test for DebugFlags.ipe
- - - - -
0da1543f by Duncan Coutts at 2026-05-19T12:45:37-04:00
Document removal of the signal-based interval timer
Update mentions within the RTS section of the users guide.
Add a changelog entry.
- - - - -
b2911514 by Duncan Coutts at 2026-05-19T12:45:37-04:00
Fix section for an recent changelog entry
- - - - -
d6d76a7a by David Eichmann at 2026-05-19T12:46:19-04:00
ghc-toolchain: implement llvm program versioning logic
- - - - -
2dd36fa3 by Wolfgang Jeltsch at 2026-05-20T04:49:52-04:00
Turn `Trustworthy` into `Safe` in `base` where possible
- - - - -
f4399dd1 by Wolfgang Jeltsch at 2026-05-20T04:50:37-04:00
Make the current `base` buildable with GHC 10.0
- - - - -
1a7de232 by Duncan Coutts at 2026-05-20T12:26:25-04:00
Hadrian: remove legacy rts .so symlinks
For compatibility with the old makefile based build system, hadrian had
rules to generate symlinks from unversioned to versioned names for the
rts .so/.dynlib file, like libHSrts-ghcx.y.so -> libHSrts-1.0.3-ghcx.y.so
We no longer need these symlinks since the makefile build system has
been retired some time ago. The need for these symlinks is awkward on
windows where we cannot (in practice) create symlinks. So rather than
make them conditional (non-windows), just remove them entirely.
- - - - -
286f1adf by fendor at 2026-05-20T12:27:09-04:00
Fix regression T27202: `:load` and `:add` work in GHCi
To fix the regression there are conceptually two major things that we
fix:
* We don't remove the `importDirs` from `interactive-session`
* When `:add`ing a module, we don't try to find them via PackageImports
* The PackageImport is wrong as we can't know the package-name at
this stage in ghc/UI.hs
What does it mean to not remove the `importDirs` from
`interactive-session`?
It means that, given some initial `DynFlags`, we will use those
`importDirs` in `interactive-session`.
The initial `DynFlags`, however, depend on how you initialise the GHC
session.
For a simple session, initialised by
ghc -isrc -this-unit-id main
It is simple, just use the `DynFlags` given on the cli.
Thus, `main` and `interactive-session` will have the same `DynFlags`,
except for the `homeUnitId` and `interactive-session` depends on `main`
by construction of the GHCi session.
What about a multiple home unit session, though?
ghc -unit @unit1 -unit @unit2
What are the `DynFlags` in this cli invocation? It shouldn't be either
`@unti1` nor `@unit2`, as the order shouldn't matter or any other
implicit condition.
For consistency, we decide that the initial `DynFlags` are the top
`DynFlags` on the cli, ignoring `-unit` flags.
Thus, in this example, there are no `importsDirs` regardless of what we
might find in `@unit1` and `@unit2`.
But in this invocation:
ghc -isrc -unit @unit1 -unit @unit2
The `interactive-session` will have the `importsDirs` `src`.
Note, `-isrc` will be inherited in `@unit1` and `@unit2`, so you need to
explicitly use `-i` to clear the `importsDirs`, in order to avoid
accidentally adding `src` as an import directory to all other home
units.
This fix has been made possible by the improvements introduced in
!15888, which avoids ambiguity when a home unit shares the `importsDirs`
with the `interactive-session`, on top of being much faster for multiple
home units.
Adds regression tests for T27202 for `:load`ing and `:add`ing modules
that are located in import directories.
- - - - -
728662de by fendor at 2026-05-20T12:27:09-04:00
Use home unit package db stacks in GHCi prompt and session unit
In order to import modules from home unit dependencies (e.g., `Data.Map`),
the ghci prompt unit needs to populate its `UnitState`.
This is tricky to handle correctly, which `PackageDBFlag`s should we use
to populate the `UnitState`?
We decide, the most intuitive solution for users is to depend on all
`PackageDBFlag`s, so that any dependency can be imported in GHCi.
This assumes consistency in the `PackageDBFlag`s, so no two home units
specify `PackageDBFlag`s that are inconsistent with each other.
We could simply concat all the `PackageDBFlag`s of the existing home
units, but later `PackageDBFlag`s shadow earlier ones, leading to the
last processed home units' `PackageDBFlag`s to shadow the earlier ones.
This is hard to fix, we need to give users the capability to provide ghc
options for the ghci prompt home unit.
However, as this is considerably more work, we decided on an
approximation that should work out most of the time.
Package Db stacks in cabal and stack follow a certain structure:
-no-user-package-db > -package-db $cabal-store > -package-db $local-db
The first two arguments are always the same, namely the
`-no-user-package-db` and `-package-db`.
We compute the longest common prefix over all home units, and use that
as the start of the package db stack. Then, over the rest of the
`PackageDBFlag`s, we simply take the union and append them to our
initial stack.
We assume, that the rest of package dbs only defines very few, "local"
units that are usually not shadowing each other.
This allows us to get a relatively consistent package database stack for
the ghci prompt home unit.
Similar reasoning applies to the session unit in order to add modules to
the session and have dependencies available in the module.
We do something similar for `-package` flags, to make sure only the
correct units are actually visible in the ghci session.
This time, we simply take the union of all `PackageFlag`s, allowing us
to import modules from the home unit dependencies.
In the future, it would be beneficial to allow the user to provide the
exact ghc options to control the visibilities. For now, this will have
to do.
- - - - -
740d89a0 by Simon Peyton Jones at 2026-05-20T17:20:44-04:00
Do not use mkCast during typechecking
This commit fixes #27219. The problem was that the typechecker was using
`mkCast`, whose assertion checks legitimately fail when applied to types
that contain unification variables.
- - - - -
a50fdb06 by Simon Peyton Jones at 2026-05-20T17:20:45-04:00
Major refactor of the Simplifier
The main payload of this patch is to refactor the Simplifer to avoid
repeated simplification when using Plan (AFTER) for rule rewrites.
The need for this was shown up by #26989.
See Note [Avoid repeated simplification] in GHC.Core.Opt.Simplify.Iteration.
Related refactoring:
* Refactor the two fields `sc_dup` and `sc_env` in `ApplyToVal` into one, `sc_env`.
Reason: the envt is irrelevant in the "simplified" case, so the data type describes
the possiblitiies much more accurately now.
* Some refactoring in `knownCon` to split off `wrapDataConFloats`.
* Refactor `lookupRule` and its auxiliary functions to return `RuleMatch`,
a new data type. See Note [data RuleMatch] in GHC.Core. Ditto for BuiltinRule.
This RuleMatch returns fragments of the target in rm_args and rm_floats,
leaving `rm_rhs` to be the stuff from the RULE itself.
Doing this has routine consequences in GHC.Core.Opt.ConstantFold. Many changes
there but all routine.
* When doing occurrence analysis on RULEs, make the occ-info on the rule
binders relate just to the RHS, not the LHS. See (OUR1) in
Note Note [OccInfo in unfoldings and rules]
This means that Lint must not complain about the fact that the patterns
in the RULE mentions binders that are marked dead.
See Note [Dead occurrences] in GHC.Core.Lint.
I changed the Core pretty-printer so that it didn't suppress dead binders,
else I can't see those binders in RULEs. That led to quite a lot of testsuite wibbles.
* Refactor FloatBinds, so that it is used both by
`exprIsConApp_mabye` and by `lookupRule`
* Move the definition of FloatBinds out of GHc.Core.Make, into GHC.Core.
* Add FloatTick as an extra constructor.
* Refactor `lookupRule` to use `FloatBinds` instead of `BindWrapper`.
This refactor just shares more code.
(Rename GHC.Core.Opt.FloatOut.FloatBinds to FloatLets, to avoid gratuitious
name clash with GHC.Core.FloatBinds.)
Corecion optimisation
* In simpleOpt, when composing coercions, call new function `optTransCo`.
This is much lighter weight than full blown coercion optimisation.
* Make `GHC.Core.Opt.Arity.pushCoValArg` and `pushCoTyArg` return the
coercionLKind of the coercion. This saves recomputing that coercionLKind
at the key call sites in GHC.Core.Opt.Simplify.Iteration.pushCast.
* Rename `addCoerce` in GHC.Core.Simplify.Iteration to become `pushCast`.
* In the `ApplyToVal` case of `pushCast` we had a very unsavoury call to `simplArg`.
I eliminated it by adding a field `sc_cast` to `ApplyToVal` that records any
pending casts. Much nicer now. See Note [The sc_cast field of ApplyToVal].
* Don't optimise coercions if the type-substitution is empty.
See Note [Optimising coercions] in GHC.Core.Opt.Simplify.Iteration.
The fix for #26838 is dramatic. For the test in perf/compiler/T26839 we have
Compiler allocs: Before: 7,363M
After: 688M
Compile time goes down generally. Here are compiler-alloc changes
over 0.5%:
CoOpt_Read(normal) 729,184,920 -0.7%
CoOpt_Singletons(normal) 666,916,960 -4.6% GOOD
LargeRecord(normal) 1,227,056,876 +1.1%
T12227(normal) 256,827,604 -4.6% GOOD
T12425(optasm) 76,879,410 -0.8%
T12545(normal) 787,826,918 -10.8% GOOD
T12707(normal) 775,186,464 -0.9%
T13253(normal) 318,599,596 -0.8%
T14766(normal) 685,857,320 -1.0%
T15304(normal) 1,123,333,422 -2.2%
T15630(normal) 123,142,330 -2.6%
T15630a(normal) 123,092,100 -2.6%
T15703(normal) 299,751,682 -2.9% GOOD
T17516(normal) 964,072,280 +1.0%
T18223(normal) 367,016,820 -6.2% GOOD
T18730(optasm) 130,643,770 -3.3% GOOD
T20261(normal) 535,608,584 -0.7%
T21839c(normal) 340,340,436 -0.9%
T24984(normal) 85,568,392 -1.9%
T3064(normal) 174,631,992 -1.2%
T3294(normal) 1,215,886,432 -0.7%
T5030(normal) 141,449,704 -17.2% GOOD
T5321Fun(normal) 258,484,744 -1.9%
T8095(normal) 770,532,232 -2.7%
T9630(normal) 858,423,408 -14.5% GOOD
T9872c(normal) 1,591,709,448 +0.7%
info_table_map_perf(normal) 19,700,614,458 -1.3%
geo. mean -0.7%
minimum -17.2%
maximum +1.1%
However, strangely there seems to be a 5.0% increase in CoOpt_Read in
the x86_64-linux-fedora43-validate+debug_info+ubsan job, although
there generally a /decrease/ in this test in other builds. The baseline
value looks strange. Anyway I'll just accept it.
Metric Decrease:
CoOpt_Singletons
T12227
T12545
T12707
T15703
T18223
T18730
T21839c
T5030
T9630
Metric Increase:
CoOpt_Read
- - - - -
834623d4 by Mrjtjmn at 2026-05-20T17:21:41-04:00
users-guide: Fix weird notation in "Summary of stolen syntax"
- - - - -
6f9d7c71 by Markus Läll at 2026-05-21T15:25:34-04:00
Use "grimily" instead of "grimly"
Fixes https://gitlab.haskell.org/ghc/ghc/-/issues/27221
- - - - -
50e999ca by fendor at 2026-05-21T15:26:18-04:00
Speed up 'closure' computation in `ghc-pkg`
Cache the set of already seen `UnitId`s and use `Set` operations to
speed up 'closure' computation.
Further simplify the implementation of 'closure' to account for the
actual usage.
As a consequence, we rename 'closure' to 'brokenPackages' to reflect its
purpose better after the simplification.
- - - - -
7ecc6184 by sheaf at 2026-05-21T15:27:10-04:00
TcMPluginHandling: be more lenient when no plugins
This change ensures that, if a function such as 'typecheckModule' was
invoked with 'NoTcMPlugins', GHC doesn't spuriously complain about TcM
plugins having already been stopped, as there were none to start with.
- - - - -
72c8de5c by Simon Jakobi at 2026-05-23T18:41:42-04:00
Implement List.elem via foldr
...in order to allow specialization to Eq instances.
The implementation of notElem is updated for consistency.`
Corresponding CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/412
Addresses #27096.
- - - - -
3268c610 by Alan Zimmerman at 2026-05-23T18:42:30-04:00
EPA: Fix span for qualified multiline string
Fix the span for a qualified multiline string like
Text."""
I'm a multiline
Text value
!
"""
to extend to the end of the entire string, not just the first line.
Closes #27274
- - - - -
1f096790 by Alan Zimmerman at 2026-05-23T18:43:20-04:00
EPA: Fix exact printing namespace-specified wildcards
Ensures correct printing of imports of the form
import Data.Bool (data True(data ..))
import Data.Bool (data True(type ..))
Closes #27291
- - - - -
56ada7c0 by Mrjtjmn at 2026-05-23T18:44:19-04:00
Fix ambiguous syntax of BangPatterns in users guide
Update documentation for the BangPatterns extension to specify
how surrounding whitespace affects interpretation of `!`.
* Only when there is whitespace before `!` and no whitespace after,
it is recognized as a BangPattern.
* Other cases `⟨varid⟩!⟨varid⟩`, `⟨varid⟩ ! ⟨varid⟩`, `⟨varid⟩! ⟨varid⟩`
are treated as infix operators.
- - - - -
579aa0b7 by Simon Jakobi at 2026-05-25T16:31:26-04:00
Ensure that SetOps.{minusList,unionListsOrd} can be specialized
...by marking them INLINABLE. Haddock allocates 0.1–0.3% less as a
result.
This also removes some redundant constraints on unionListsOrd.
- - - - -
cccf45da by Cheng Shao at 2026-05-25T16:32:13-04:00
wasm: ensure post-linker output is synchronous ESM
This patch fixes wasm backend's post-linker output script to ensure
it's synchronous ESM and doesn't use top-level await, which doesn't
work in ServiceWorkers. Fixes #27257.
- - - - -
8db331a3 by Zubin Duggal at 2026-05-26T04:54:03-04:00
Update to semaphore-compat 2.0.0 using v2 of the protocol
On Linux and other POSIX platforms, GHC's -jsem jobserver client now
speaks v2 of the semaphore-compat protocol, which uses Unix domain
sockets in place of POSIX named semaphores. This avoids the libc-ABI
issues that affected the old implementation. Windows is unaffected
and continues to use the v1 protocol (Win32 named semaphores); its
reported protocol version remains v1.
When GHC receives a -jsem name whose protocol version it does not
support, it emits a -Wsemaphore-version-mismatch warning and falls
back to -j<N> rather than crashing. ghc --info exposes the supported
version in a new "Semaphore version" entry so cabal-install can detect
a mismatch before invoking GHC.
Users on a cabal-install that predates the v2 update will continue to
build successfully on Linux/POSIX, but will lose the cross-process
-jsem coordination and fall back to -j<N> per GHC invocation. Users
must upgrade to a cabal-install that supports protocol v2 to recover
full parallelism.
Also fix a leak in cleanupSem (#27253): cleanupSem used to snapshot
heldTokens and release them before killing the loop, while the loop's
in-flight acquire/release children could still be mutating it.
Cleanup now runs inside the loop's own exit handler, after draining
the active child via a new activeChild TVar, so the snapshot has no
concurrent mutator.
See also:
- GHC proposal amendment: https://github.com/ghc-proposals/ghc-proposals/pull/673
- cabal-install patch: https://github.com/haskell/cabal/pull/11628
- semaphore-compat MR: https://gitlab.haskell.org/ghc/semaphore-compat/-/merge_requests/8
Bump semaphore-compat submodule to 2.0.0
Fixes #25087 and #27253
- - - - -
17be4f1f by Alan Zimmerman at 2026-05-26T04:54:52-04:00
EPA: Record semicolons in HsModifier
Ensure the semi colons are captured in the ParsedSource for code like
%True;; %False;
instance C D
It makes HsModifier (and hence HsModifierOf) LocatedA, so the semi
colons can be recorded as [TrailingAnn]
Also rename pprHsModifiers to pprLHsModifiers to match.
Closes #27294
- - - - -
8f991755 by fendor at 2026-05-26T11:02:52-04:00
Revert prog003 acceptance
We thought the commit 286f1adff3e78d775ff325caff71d0cee25d710b fixed the
test, but due to changes to ghci, modules loaded during the GHCi
session, the test was actually no longer testing what it set out to do,
"fixing" the broken test.
As modules are added to the `interactive-session` home unit, the object code needs
to be compiled with `-this-unit-id interactive-session`, otherwise the
object code won't be used.
Once this has been fixed in the test, the test fails as expected again.
- - - - -
277a3687 by mangoiv at 2026-05-26T11:03:40-04:00
libraries/process: bump submodule to v1.6.29.0
This submodule bump resolves a segfault on macos 15.
Fixes #27144
- - - - -
6779bb0c by mangoiv at 2026-05-26T11:03:40-04:00
libraries/unix: in submodule, don't pick branch 2.7
The 2.7 branch is outdated and the module has been advanced far beyond
it anyway, so remove that line.
- - - - -
4a645683 by Simon Peyton Jones at 2026-05-27T21:41:59-04:00
Trim the continuation in mkDupableContWithDmds
When there are no remaining argument demands, it means the application
is bottoming. In this case, we can trim the continuation to avoid the
panic that was observed in #27261.
See Note [Trimming the continuation for bottoming functions] in
GHC.Core.Opt.Simplify.Iteration.
- - - - -
8ab506ff by Cheng Shao at 2026-05-27T21:42:47-04:00
ghci: fix module name string lifetime in hs_hpc_module invocation
This patch makes hpcAddModule pass a properly malloced module name
string to hs_hpc_module, instead of using useAsCString which causes
use-after-free of module name string. Fixes #27297.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
b0233814 by sheaf at 2026-05-27T21:43:31-04:00
Relax acceptance threshold for T10421
As seen in #27289, the 1% acceptance threshold for this text was
overly narrow, resulting in spurious test failures. This commit widens
the acceptance threshold to 2%. Fixes #27289.
- - - - -
63ce5770 by Luite Stegeman at 2026-05-28T12:23:35-04:00
Fixes for black holes
- suspend duplicate work for eager black holes
- detect eager black holes in checkBlockingQueues
- don't overwrite existing black holes even if they're not
in an eager blackhole frame
- don't deadlock on self when thunk is already blackholed
Fixes #26936
- - - - -
037a80dc by Tom McLaughlin at 2026-05-28T12:24:36-04:00
Event/Windows.hsc: rethrow exceptions in overlapped IO
This prevents the WinIO manager from swallowing exceptions in overlapped IO. It
was added to make WinIO support possible in the `network` library. See
https://gitlab.haskell.org/ghc/ghc/-/issues/27283.
We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP.
- - - - -
2d53bcdb by Wolfgang Jeltsch at 2026-05-28T12:25:21-04:00
Allow `downsweep` to use nodes of an existing module graph
To this end, `downsweep` has not been able to use the nodes of a module
graph obtained from a previous downsweeping round. In some GHC API
applications, downsweeping is performed somewhat incrementally and
therefore could profit from reusing such existing results. This
contribution makes this possible.
Resolves #27054.
Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com>
- - - - -
f4fbb583 by Simon Jakobi at 2026-05-28T12:26:04-04:00
Add regression test for T11226
Closes #11226.
- - - - -
ed29a5e6 by Sven Tennie at 2026-05-28T17:30:36-04:00
Add optional config setting for LibDir (#19174)
Previously, the `libDir` was derived from `topDir`. This won't work for
inplace stage2 cross-compilers where binaries and libraries are in
different stage dirs (`_build/stage1/` for executables and
`_build/stage2` for libraries).
`LibDir` is set in the inplace `settings` files. For bindists, we
generate a new `settings` file with no `LibDir` entry. GHC then defaults
to use `topDir` as `libDir` again. This keeps the bindist relocatable.
If `LibDir` is a relative path, it is interpreted relatively to
`topDir`.
The global package db is part of the `lib/` folder. If we want to point
for inplace cross-compilers to the succeeding stage's folder, this is
done by setting `LibDir`. Thus, the global package db must be found
relative to `libDir`` (which may default to `topDir` or be set by
`LibDir`).
The complexity of settings becomes scary. So, add a test to ensure
`LibDir` works as expected.
- - - - -
8339cf8f by Sven Tennie at 2026-05-28T17:30:36-04:00
Add Haddock to FileSettings
Helping to understand the fields' meanings without deeper analyses.
- - - - -
4ce251e4 by Sylvain Henry at 2026-05-28T17:31:39-04:00
foundation test: skip signed minBound `quot` (-1) (#27222)
`minBound `quot` (-1)` for fixed-width signed integers is platform
dependent: the mathematical result -minBound is not representable in
the type. On x86, IDIV traps; LLVM's sdiv is undefined behaviour in
this case; on AArch64/RISC-V, SDIV wraps to minBound.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
b8ba7e61 by Simon Jakobi at 2026-05-28T17:32:23-04:00
Prevent dictionary-passing in checkTyEqRhs
...by pre-specializing it to TcM.
Previously, wherever checkTyEqRhs was used in other modules, the
Core showed dictionary passing ($fMonadIOEnv). The added SPECIALIZE
pragma prevents this.
- - - - -
d603477f by David Eichmann at 2026-05-29T13:17:12-04:00
Hadrian: create a ghc-internal .def file per ghc-internal dll
The .def file generated from rts/win32/libHSghc-internal.def.in contains
the name of the ghc-internal dll. The correct dll name differs based
on if the dll is inplace/final and if using the Dynamic way. Previously,
this was not accounted for and inconsistent dlls names where used. That
led to failure when loading dlls at runtime in experiments with windows
dynamic linking.
- - - - -
1fc21753 by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: copy backend interface haddocks to Native backend (#27305)
The haddock comments documenting the BigNat backend interface (function
contracts, expected MutableWordArray# sizes, return-value semantics, etc.)
were attached to the FFI backend module. Copy them to the Native backend
so they remain in tree once the FFI backend is removed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
717059df by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: remove FFI backend (#27305)
The FFI backend of ghc-bignum (now part of ghc-internal) had no known
users and is easy to recreate by relinking ghc-internal with a custom
backend. Remove the backend module, the bignum-ffi cabal flag, and the
ffi option from Hadrian's --bignum selector. The backend interface
documentation now lives in the Native backend module.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
4bb3b1d8 by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: remove Check backend (#27305)
The Check backend of ghc-bignum (now part of ghc-internal) compared the
selected backend's output against the Native backend for validation.
It had no known users. Remove the backend module, the bignum-check
cabal flag, the bignumCheck Hadrian flavour field, and the check-
prefix in Hadrian's --bignum selector.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
6b3044a0 by David Eichmann at 2026-05-30T11:58:48-04:00
Add code comments to allocator code
- - - - -
f4e04210 by Matthew Pickering at 2026-05-30T11:59:34-04:00
hadrian: Refactor system-cxx-std-lib rules
I noticed a few things wrong with the hadrian rules for
`system-cxx-std-lib` rules.
* For `text` there is an ad-hoc check to depend on `system-cxx-std-lib`
outside of `configurePackage`.
* The `system-cxx-std-lib` dependency is not read from cabal files.
* Recache is not called on the packge database after the `.conf` file is
generated, a more natural place for this rule is `registerRules`.
Treating this uniformly like other packages is complicated by it not
having any source code or a cabal file. However we can do a bit better
by reporting the dependency firstly in `PackageData` and then needing
the `.conf` file in the same place as every other package in
`configurePackage`.
This commit increases the `shakeVersion`, to provide backwards
compatibility to previous builds with different PackageData.
Fixes #25303
Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com>
- - - - -
576987d0 by Simon Jakobi at 2026-06-02T04:53:36-04:00
compiler: use nubOrd from containers
Address #27103 by replacing GHC.Utils.Misc.ordNub[On] with
Data.Containers.ListUtils.nubOrd[On].
Note that nubOrd suffers from a small inefficiency, a fix for which
will be included in the next containers release:
https://github.com/haskell/containers/issues/1202
- - - - -
deea53c3 by David Eichmann at 2026-06-02T04:54:22-04:00
Hadrian: disable response files for GHC/Haddock builders on non-Windows
This makes debugging build errors easier on non-windows hosts.
See issue #27230
- - - - -
f2f5c6ba by Nikita Efremov at 2026-06-02T16:04:54+00:00
fix typo : compete with performance, not complete
- - - - -
5524ea0e by Wolfgang Jeltsch at 2026-06-03T08:01:26-04:00
Make the current `base` buildable with GHC 9.14
This comprises the following changes:
* Disable some imports into `GHC.Base` for GHC 9.14
* Disable some imports into `Prelude` for GHC 9.14
* Disable separate `ArrowLoop` import for GHC 9.14
* Disable `GHC.Internal.STM` import for GHC 9.14
* Disable `GHC.Internal.Unicode.Version` import for GHC 9.14
* Disable `GHC.Internal.TH.Monad` import for GHC 9.14
* Add alternative `fixIO` import for GHC 9.14
* Add alternative `unsafeCodeCoerce` import for GHC 9.14
* Disable hiding of imported SIMD operations for GHC 9.14
* Disable use of GHC 9.14’s `printToHandleFinalizerExceptionHandler`
* Enable use of `getFileHash` from `ghc-internal` for GHC 9.14
* Make `thenA` available for GHC 9.14
* Make `thenM` available for GHC 9.14
* Disable translation of `IoManagerFlagPoll` for GHC 9.14
* Add `hGetNewlineMode` for GHC 9.14
- - - - -
d3438055 by Enrico Maria De Angelis at 2026-06-03T08:02:17-04:00
Fix #27067 - Clarify haddocks on `minusNaturalMaybe`
- - - - -
f9bcfac2 by sheaf at 2026-06-03T14:47:19-04:00
Avoid mkTick in Core Prep breaking ANF
As discovered in #27182, mkTick can break ANF. This patch introduces a
variant of mkTick that skips the single optimisation that could break
ANF. This is preferrable over switching to the raw Tick constructor,
as the latter may introduce spurious cost centres in profiling reports.
This is a temporary measure until we more thoroughly refactor how
mkTick works (see #27141).
See Note [mkTick breaks ANF] in GHC.CoreToStg.Prep.
Fixes #27182
- - - - -
cf1fd661 by Artem Pelenitsyn at 2026-06-03T14:48:09-04:00
clarify comment for getSizeofMutableByteArray#: we get the size in bytes, not "elements"
- - - - -
a3b431f3 by David Eichmann at 2026-06-04T10:10:19+00:00
Hadrian: convert env variable ACLOCAL_PATH to unix paths.
Convert ACLOCAL_PATH to a unix style path when invoking autoreconf.
Autoreconf doesn't handle windows paths.
See Note [Autoreconf unix paths from ACLOCAL_PATH].
Fixes #27311
- - - - -
18f6138a by Simon Jakobi at 2026-06-04T20:20:31-04:00
testsuite: Deduplicate --only test names
config.only is assumed to be a set, but supplying --only overwrote it
with the (list) argparse result, which can contain duplicates. When a
test ran, config.only.remove(name) dropped only the first occurrence,
so a duplicated name lingered and was later misreported as a
"test not found" framework failure. Store it as a set instead.
Fixes #27322
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
633a3176 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Remove Type from StgOpApp
- - - - -
4e632721 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Fix issues and remove Type from StgFCallOp
- - - - -
8e3ad21e by Jaro Reinders at 2026-06-06T17:29:32+02:00
Remove Type from StgRhsClosure
- - - - -
91d9771a by Jaro Reinders at 2026-06-06T17:29:32+02:00
Remove redundant whitespace
- - - - -
3f7d47a5 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Add note about tagToEnum# in STG
- - - - -
a6cef2b0 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Remove kind from StgOpApp
- - - - -
aec429b0 by Jaro Reinders at 2026-06-06T17:29:32+02:00
FIx whitespace
- - - - -
8ed8e818 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Post-merge fixes
- - - - -
bfd53342 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Do almost all the todos
- - - - -
0c63024e by Jaro Reinders at 2026-06-06T17:29:32+02:00
One more thing
- - - - -
c9e904f1 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Remove EOL whitespace
- - - - -
af7c98e9 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Remove redundant import
- - - - -
2b64bd58 by Jaro Reinders at 2026-06-06T17:29:32+02:00
Fix two remaining issues
- - - - -
690 changed files:
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- .gitlab/merge_request_templates/Default.md
- .gitmodules
- boot
- + changelog.d/T19174.md
- + changelog.d/T26979
- + changelog.d/T27022
- + changelog.d/T27131
- + changelog.d/T27182.md
- + changelog.d/T27202
- + changelog.d/T27261
- + changelog.d/binary-array-no-list
- + changelog.d/bump-process
- + changelog.d/bytecode-interpreter-hpc-support
- + changelog.d/cmm-import-syntax-changes
- + changelog.d/dynamic-trace-flags
- + changelog.d/elem-via-foldr-27096
- + changelog.d/fix-blackhole-handling
- + changelog.d/fix-finalizers-27072
- + changelog.d/ghc-api-epa-parens
- + changelog.d/ghc-api-holes-ast-27111
- + changelog.d/ghc-api-namespace-specifier-26678
- + changelog.d/ghc-pkg-faster-closure
- + changelog.d/hadrian-response-files.md
- + changelog.d/hadrian-system-cxx-std-lib-25303
- + changelog.d/ipe-event-class
- + changelog.d/jobserver-leak-fix
- + changelog.d/lib-add-tuple-tyfam-27179
- + changelog.d/libdir-setting
- + changelog.d/llvm-22
- + changelog.d/module-graph-reuse-in-downsweep
- + changelog.d/more-efficient-home-unit-imports-finding
- + changelog.d/no-more-timer-signal
- + changelog.d/remove-bignum-check-backend
- + changelog.d/remove-bignum-ffi-backend
- + changelog.d/rts_symlinks.md
- + changelog.d/semaphore-v2
- + changelog.d/so_inline_is_a_predicate
- + changelog.d/tcplugin_init.md
- + changelog.d/tcplugins-pmc.md
- + changelog.d/typecheckModule-API.md
- + changelog.d/wasm-fix-serviceworker
- + changelog.d/windows-rethrow-overlapped-exception
- + changelog.d/withTcPlugins.md
- compiler/GHC.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/ByteCode/Binary.hs
- compiler/GHC/ByteCode/Instr.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Cmm/Lexer.x
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/BlockLayout.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToLlvm/Base.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/FloatIn.hs
- compiler/GHC/Core/Opt/FloatOut.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Ppr.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Data/List/SetOps.hs
- compiler/GHC/Data/Pair.hs
- compiler/GHC/Driver/Backend.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/CodeOutput.hs
- compiler/GHC/Driver/Config.hs
- compiler/GHC/Driver/Config/Core/Lint.hs
- compiler/GHC/Driver/Config/Interpreter.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env/Types.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Main.hs
- + compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot
- + compiler/GHC/Driver/Main/Hsc.hs
- + compiler/GHC/Driver/Main/Interactive.hs
- + compiler/GHC/Driver/Main/Passes.hs
- + compiler/GHC/Driver/Main/Passes.hs-boot
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeAction.hs
- compiler/GHC/Driver/MakeSem.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Pipeline/Monad.hs
- compiler/GHC/Driver/Pipeline/Phases.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs/Basic.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Expr.hs-boot
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Coverage.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Errors/Ppr.hs
- compiler/GHC/HsToCore/Errors/Types.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Pmc/Solver.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/Linker/Executable.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Linker/Unit.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Parser/Types.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Settings.hs
- compiler/GHC/Settings/Constants.hs
- compiler/GHC/Settings/IO.hs
- compiler/GHC/Stg/BcPrep.hs
- compiler/GHC/Stg/CSE.hs
- compiler/GHC/Stg/Debug.hs
- compiler/GHC/Stg/EnforceEpt.hs
- compiler/GHC/Stg/EnforceEpt/Rewrite.hs
- compiler/GHC/Stg/FVs.hs
- compiler/GHC/Stg/Lift.hs
- compiler/GHC/Stg/Lift/Analysis.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Make.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Stats.hs
- compiler/GHC/Stg/Syntax.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToCmm/Utils.hs
- compiler/GHC/StgToJS/Expr.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Ids.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/StgToJS/Sinker/Collect.hs
- compiler/GHC/StgToJS/Sinker/StringsUnfloat.hs
- compiler/GHC/StgToJS/Utils.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/GHC/Tc/Errors/Hole.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.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/Types/Evidence.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Error.hs
- compiler/GHC/Types/Error.hs-boot
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/ForeignStubs.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/HpcInfo.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Unique/DSet.hs
- compiler/GHC/Types/Unique/Supply.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Info.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/Graph.hs
- compiler/GHC/Unit/Module/ModGuts.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Misc.hs
- compiler/GHC/Utils/Ppr/Colour.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Decls/Foreign.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/ImpExp.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Type.hs
- compiler/ghc.cabal.in
- configure.ac
- distrib/configure.ac.in
- docs/users_guide/debug-info.rst
- docs/users_guide/extending_ghc.rst
- docs/users_guide/exts/explicit_namespaces.rst
- docs/users_guide/exts/linear_types.rst
- docs/users_guide/exts/modifiers.rst
- docs/users_guide/exts/qualified_strings.rst
- docs/users_guide/exts/required_type_arguments.rst
- docs/users_guide/exts/stolen_syntax.rst
- docs/users_guide/exts/template_haskell.rst
- docs/users_guide/javascript.rst
- docs/users_guide/profiling.rst
- docs/users_guide/runtime_control.rst
- docs/users_guide/using-warnings.rst
- docs/users_guide/using.rst
- ghc/GHC/Driver/Session/Mode.hs
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Info.hs
- ghc/Main.hs
- ghc/ghc-bin.cabal.in
- hadrian/README.md
- hadrian/build-cabal.bat
- hadrian/cfg/default.host.target.in
- hadrian/cfg/default.target.in
- hadrian/doc/flavours.md
- hadrian/doc/user-settings.md
- hadrian/src/Builder.hs
- hadrian/src/CommandLine.hs
- hadrian/src/Flavour.hs
- hadrian/src/Flavour/Type.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Builder/Ar.hs
- hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
- hadrian/src/Hadrian/Haskell/Cabal/Type.hs
- hadrian/src/Hadrian/Oracles/Path.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Main.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Default.hs
- hadrian/src/Settings/Packages.hs
- libraries/base/changelog.md
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Arrow.hs
- libraries/base/src/Control/Exception.hs
- libraries/base/src/Control/Monad.hs
- libraries/base/src/Control/Monad/IO/Class.hs
- libraries/base/src/Data/Array/Byte.hs
- libraries/base/src/Data/Data.hs
- libraries/base/src/Data/Fixed.hs
- libraries/base/src/Data/Functor/Classes.hs
- libraries/base/src/Data/Functor/Compose.hs
- libraries/base/src/Data/List/NonEmpty.hs
- libraries/base/src/Data/Version.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/ByteOrder.hs
- libraries/base/src/GHC/Conc.hs
- libraries/base/src/GHC/Conc/Sync.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- libraries/base/src/GHC/IO/Handle.hs
- libraries/base/src/GHC/RTS/Flags.hs
- libraries/base/src/GHC/Unicode.hs
- libraries/base/src/GHC/Weak.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- libraries/base/src/Numeric.hs
- libraries/base/src/Prelude.hs
- libraries/base/src/System/IO.hs
- libraries/base/src/System/Mem/Weak.hs
- libraries/base/src/System/Timeout.hs
- libraries/base/src/Text/Printf.hs
- libraries/base/src/Text/Read.hs
- libraries/base/tests/perf/ElemNoFusion_O1.stderr
- libraries/base/tests/perf/ElemNoFusion_O2.stderr
- libraries/ghc-bignum/ghc-bignum.cabal
- + libraries/ghc-boot/GHC/Data/ShortByteString.hs
- libraries/ghc-boot/GHC/Settings/Utils.hs
- libraries/ghc-boot/ghc-boot.cabal.in
- libraries/ghc-experimental/src/Data/Sum/Experimental.hs
- libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
- libraries/ghc-internal/bignum-backend.rst
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/include/CTypes.h
- libraries/ghc-internal/src/GHC/Internal/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Check.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/FFI.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Selected.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/Exts.hs
- libraries/ghc-internal/src/GHC/Internal/Float.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Device.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO/IOMode.hs
- libraries/ghc-internal/src/GHC/Internal/List.hs
- libraries/ghc-internal/src/GHC/Internal/Natural.hs
- libraries/ghc-internal/src/GHC/Internal/Numeric.hs
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
- libraries/ghc-internal/src/GHC/Internal/Read.hs
- − libraries/ghc-internal/src/GHC/Internal/Text/Read.hs
- libraries/ghc-internal/src/GHC/Internal/Types.hs
- + libraries/ghci/GHCi/Coverage.hs
- libraries/ghci/GHCi/Message.hs
- libraries/ghci/GHCi/Run.hs
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[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL] 11 commits: hadrian: Build stage 2 cross compilers
by Sven Tennie (＠supersven) 06 Jun '26
by Sven Tennie (＠supersven) 06 Jun '26
06 Jun '26
Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL at Glasgow Haskell Compiler / GHC
Commits:
6b4205db by Matthew Pickering at 2026-06-06T15:01:51+02:00
hadrian: Build stage 2 cross compilers
* Most of hadrian is abstracted over the stage in order to remove the
assumption that the target of all stages is the same platform. This
allows the RTS to be built for two different targets for example.
* Abstracts the bindist creation logic to allow building either normal
or cross bindists. Normal bindists use stage 1 libraries and a stage 2
compiler. Cross bindists use stage 2 libararies and a stage 2
compiler.
* hadrian: Make binary-dist-dir the default build target. This allows us
to have the logic in one place about which libraries/stages to build
with cross compilers. Fixes #24192
New hadrian target:
* `binary-dist-dir-cross`: Build a cross compiler bindist (compiler =
stage 1, libraries = stage 2)
This commit also contains various changes to make stage2 compilers
feasible.
-------------------------
Metric Decrease:
LinkableUsage02
ManyAlternatives
ManyConstructors
MultiComponentModulesRecomp
MultiLayerModulesRecomp
RecordUpdPerf
T10421
T12150
T12227
T12425
T12707
T13035
T13379
T13820
T15703
T16577
T18140
T18282
T18698a
T18698b
T18923
T1969
T20049
T21839c
T3294
T4801
T5030
T5321FD
T5321Fun
T5631
T5642
T6048
T783
T9020
T9198
T9233
T9630
T9872d
T9961
parsing001
Metric Increase:
T26989
hard_hole_fits
-------------------------
Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com>
- - - - -
0b4537f2 by Matthew Pickering at 2026-06-06T15:01:51+02:00
ci: Test cross bindists
We remove the special logic for testing in-tree cross
compilers and instead test cross compiler bindists, like we do for all
other platforms.
- - - - -
2cbe70fc by Matthew Pickering at 2026-06-06T15:01:51+02:00
ci: Introduce CROSS_STAGE variable
In preparation for building and testing stage3 bindists we introduce the
CROSS_STAGE variable which is used by a CI job to determine what kind of
bindist the CI job should produce.
At the moment we are only using CROSS_STAGE=2 but in the future we will
have some jobs which set CROSS_STAGE=3 to produce native bindists for a
target, but produced by a cross compiler, which can be tested on by
another CI job on the native platform.
CROSS_STAGE=2: Build a normal cross compiler bindist
CROSS_STAGE=3: Build a stage 3 bindist, one which is a native compiler and library for the target
- - - - -
74f1671d by Sven Tennie at 2026-06-06T15:01:51+02:00
ci: Increase timeout for emulators
Test runs with emulators naturally take longer than on native machines.
Generate jobs.yml
- - - - -
a777c431 by Matthew Pickering at 2026-06-06T15:01:51+02:00
ci: Javascript don't set CROSS_EMULATOR
There is no CROSS_EMULATOR needed to run javascript binaries, so we
don't set the CROSS_EMULATOR to some dummy value.
- - - - -
dfc32f39 by Sven Tennie at 2026-06-06T15:01:51+02:00
Javascript skip T23697
See #22355 about how HSC2HS and the Javascript target don't play well
together.
- - - - -
ce822003 by Sven Tennie at 2026-06-06T15:01:51+02:00
Mark T24602 as fragile
It was skipped before (due to CROSS_EMULATOR being set, which changed
for JS), so we don't make things worse by marking it as fragile.
- - - - -
9afdc00e by Sven Tennie at 2026-06-06T15:01:51+02:00
Fix T22744 for GHCJS
In fact, this test needs Template Haskell, not necessarily an
interpreter.
- - - - -
4f26df1f by Sven Tennie at 2026-06-06T15:07:29+02:00
Fixup: Simplify
- - - - -
bd280c4b by Sven Tennie at 2026-06-06T13:25:16+00:00
hadrian: Fix CrossCompiling checks, clarify predStage usage
Replace the global `flag CrossCompiling` with a per-stage `crossStage`
check in Cabal.hs: stage 0 packages are always native (host→host), so
stripping can be enabled there. Only disable stripping when building for
a foreign target (stage 1+ in a cross build).
Introduce a named `compilerStage = predStage stage` binding in Cabal.hs,
Hsc2Hs.hs and Generate.hs to make clear that `predStage stage` refers to
the GHC compiler that builds packages in the current stage.
Remove a misleading "MP: Wrong use of CrossCompiling" comment in
Hsc2Hs.hs; the code is correct because `isWinTarget stage` already
provides the necessary per-stage guard.
- - - - -
7c66c035 by Sven Tennie at 2026-06-06T13:51:29+00:00
hadrian: Simplify: deduplicate crossStage call, remove local yesNo
- - - - -
61 changed files:
- .gitlab/ci.sh
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- + changelog.d/stage2-cross-compilers
- configure.ac
- distrib/configure.ac.in
- hadrian/README.md
- hadrian/bindist/config.mk.in
- + hadrian/cfg/system.config.host.in
- hadrian/cfg/system.config.in
- + hadrian/cfg/system.config.target.in
- hadrian/hadrian.cabal
- hadrian/src/Base.hs
- + hadrian/src/BindistConfig.hs
- hadrian/src/Builder.hs
- hadrian/src/Context.hs
- hadrian/src/Expression.hs
- hadrian/src/Flavour.hs
- hadrian/src/Flavour/Type.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Haskell/Hash.hs
- hadrian/src/Hadrian/Oracles/TextFile.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Oracles/Flavour.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Oracles/TestSettings.hs
- hadrian/src/Packages.hs
- hadrian/src/Rules.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/CabalReinstall.hs
- hadrian/src/Rules/Changelog.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Gmp.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Program.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cabal.hs
- hadrian/src/Settings/Builders/Common.hs
- hadrian/src/Settings/Builders/Configure.hs
- hadrian/src/Settings/Builders/DeriveConstants.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/Hsc2Hs.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Builders/SplitSections.hs
- hadrian/src/Settings/Default.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Performance.hs
- hadrian/src/Settings/Flavours/QuickCross.hs
- hadrian/src/Settings/Flavours/Validate.hs
- hadrian/src/Settings/Packages.hs
- hadrian/src/Settings/Program.hs
- hadrian/src/Settings/Warnings.hs
- libraries/base/tests/all.T
- testsuite/ghc-config/ghc-config.hs
- testsuite/tests/javascript/closure/all.T
- testsuite/tests/perf/compiler/all.T
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/92cda9bc90dd173dfe1266f7f70d14…
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[Git][ghc/ghc][wip/jeltsch/textual-bytecode-output] Improve printing of various strings
by Wolfgang Jeltsch (＠jeltsch) 06 Jun '26
by Wolfgang Jeltsch (＠jeltsch) 06 Jun '26
06 Jun '26
Wolfgang Jeltsch pushed to branch wip/jeltsch/textual-bytecode-output at Glasgow Haskell Compiler / GHC
Commits:
5b28ba1a by Wolfgang Jeltsch at 2026-06-06T16:24:26+03:00
Improve printing of various strings
- - - - -
1 changed file:
- compiler/GHC/ByteCode/Show.hs
Changes:
=====================================
compiler/GHC/ByteCode/Show.hs
=====================================
@@ -31,6 +31,7 @@ import Text.Show (show)
import System.IO (IO, FilePath)
import Foreign.Storable (Storable)
import GHC.Data.Strict qualified as Strict (Maybe, maybe)
+import GHC.Data.FastString (unpackFS)
import GHC.Data.FlatBag (FlatBag, elemsFlatBag)
import GHC.Fingerprint (Fingerprint)
import GHC.Types.SrcLoc (noSrcSpan)
@@ -41,7 +42,7 @@ import GHC.Types.SptEntry (SptEntry (..))
import GHC.Types.Error (MessageClass (MCDump))
import GHC.Utils.Logger (Logger, logMsg)
import GHC.Utils.Binary (BinSrcSpan (..))
-import GHC.Utils.Encoding.UTF8 (utf8DecodeShortByteString)
+import GHC.Utils.Encoding.UTF8 (utf8DecodeShortByteString, utf8DecodeByteString)
import GHC.Utils.Outputable
(
defaultDumpStyle,
@@ -181,19 +182,26 @@ pprLiterals currentModule = entry (text "literals:") .
pprLiteral :: Module -> BCONPtr -> SDoc
pprLiteral currentModule literal = case literal of
BCONPtrWord word
- -> text "word" <+> pprFixedSizeNatural word
+ -> text "word" <+>
+ pprFixedSizeNatural word
BCONPtrLbl label
- -> text "label" <+> ppr label
+ -> text "label" <+>
+ ppr label
BCONPtrItbl infoTableName
- -> text "info table" <+> ppr infoTableName
+ -> text "info table" <+>
+ ppr infoTableName
BCONPtrAddr addrName
- -> text "address" <+> ppr addrName
+ -> text "address" <+>
+ ppr addrName
BCONPtrStr encodedString
- -> text "top-level string" <+> pprByteString encodedString
+ -> text "top-level string" <+>
+ text (show (utf8DecodeByteString encodedString))
BCONPtrFS string
- -> text "top-level string" <+> ppr string
+ -> text "top-level string" <+>
+ text (show (unpackFS string))
BCONPtrFFIInfo ffiInfo
- -> text "foreign function" <+> pprFFIInfo ffiInfo
+ -> text "foreign function" <+>
+ pprFFIInfo ffiInfo
BCONPtrCostCentre breakpointID
-> text "cost center" <+>
pprInternalBreakpointID currentModule breakpointID
@@ -283,7 +291,9 @@ pprPointerTag = entry (text "pointer tag:") . ppr
-- | […]
pprDescription :: ByteString -> SDoc
-pprDescription = entry (text "description:") . pprByteString
+pprDescription = entry (text "description:") .
+ text .
+ utf8DecodeByteString
-- | […]
pprTopLevelStrings :: [(Name, ByteString)] -> SDoc
@@ -295,7 +305,10 @@ pprTopLevelStrings = entry (text "top-level strings:") .
pprTopLevelString :: Name -> ByteString -> SDoc
pprTopLevelString stringName encodedString
= entry (text "string" <+> ppr stringName <> text ":") $
- pprByteString encodedString
+ text $
+ show $
+ utf8DecodeByteString $
+ encodedString
-- | […]
pprBreakpoints :: Module -> Maybe InternalModBreaks -> SDoc
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5b28ba1a9973a16a7c721987736d3cd…
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5b28ba1a9973a16a7c721987736d3cd…
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