Cheng Shao pushed to branch wip/ubsan at Glasgow Haskell Compiler / GHC Commits: 48a3ed57 by Simon Peyton Jones at 2025-11-25T15:33:54+00:00 Add a fast-path for args=[] to occAnalApp In the common case of having not arguments, occAnalApp was doing redundant work. - - - - - 951e5ed9 by Simon Peyton Jones at 2025-11-25T15:33:54+00:00 Fix a performance hole in the occurrence analyser As #26425 showed, the clever stuff in Note [Occurrence analysis for join points] does a lot of duplication of usage details. This patch improved matters with a little fancy footwork. It is described in the new (W4) of the same Note. Compile-time allocations go down slightly. Here are the changes of +/- 0.5% or more: T13253(normal) 329,369,244 326,395,544 -0.9% T13253-spj(normal) 66,410,496 66,095,864 -0.5% T15630(normal) 129,797,200 128,663,136 -0.9% T15630a(normal) 129,212,408 128,027,560 -0.9% T16577(normal) 6,756,706,896 6,723,028,512 -0.5% T18282(normal) 128,462,070 125,808,584 -2.1% GOOD T18698a(normal) 208,418,305 202,037,336 -3.1% GOOD T18730(optasm) 136,981,756 136,208,136 -0.6% T18923(normal) 58,103,088 57,745,840 -0.6% T19695(normal) 1,386,306,272 1,365,609,416 -1.5% T26425(normal) 3,344,402,957 2,457,811,664 -26.5% GOOD T6048(optasm) 79,763,816 79,212,760 -0.7% T9020(optasm) 225,278,408 223,682,440 -0.7% T9961(normal) 303,810,717 300,729,168 -1.0% GOOD geo. mean -0.5% minimum -26.5% maximum +0.4% Metric Decrease: T18282 T18698a T26425 T9961 - - - - - f1959dfc by Simon Peyton Jones at 2025-11-26T11:58:07+00:00 Remove a quadratic-cost assertion check in mkCoreApp See the new Note [Assertion checking in mkCoreApp] - - - - - 98fa0d36 by Simon Hengel at 2025-11-27T17:54:57-05:00 Fix typo in docs/users_guide/exts/type_families.rst - - - - - 5b97e5ce by Simon Hengel at 2025-11-27T17:55:37-05:00 Fix broken RankNTypes example in user's guide - - - - - fa2aaa00 by Simon Peyton Jones at 2025-11-27T17:56:18-05:00 Switch off specialisation in ExactPrint In !15057 (where we re-introduced -fpolymoprhic-specialisation) we found that ExactPrint's compile time blew up by a factor of 5. It turned out to be caused by bazillions of specialisations of `markAnnotated`. Since ExactPrint isn't perf-critical, it does not seem worth taking the performance hit, so this patch switches off specialisation in this one module. - - - - - 1fd25987 by Simon Peyton Jones at 2025-11-27T17:56:18-05:00 Switch -fpolymorphic-specialisation on by default This patch addresses #23559. Now that !10479 has landed and #26329 is fixed, we can switch on polymorphic specialisation by default, addressing a bunch of other tickets listed in #23559. Metric changes: * CoOpt_Singleton: +4% compiler allocations: we just get more specialisations * info_table_map_perf: -20% decrease in compiler allocations. This is caused by using -fno-specialise in ExactPrint.hs Without that change we get a 4x blow-up in compile time; see !15058 for details Metric Decrease: info_table_map_perf Metric Increase: CoOpt_Singletons - - - - - b7fe7445 by Matthew Pickering at 2025-11-27T17:56:59-05:00 rts: Fix a deadlock with eventlog flush interval and RTS shutdown The ghc_ticker thread attempts to flush at the eventlog tick interval, this requires waiting to take all capabilities. At the same time, the main thread is shutting down, the schedule is stopped and then we wait for the ticker thread to finish. Therefore we are deadlocked. The solution is to use `newBoundTask/exitMyTask`, so that flushing can cooperate with the scheduler shutdown. Fixes #26573 - - - - - 1d4a1229 by sheaf at 2025-11-27T17:58:02-05:00 SimpleOpt: don't subst in pushCoercionIntoLambda It was noticed in #26589 that the change in 15b311be was incorrect: the simple optimiser carries two different substitution-like pieces of information: 'soe_subst' (from InVar to OutExpr) and 'soe_inl' (from InId to InExpr). It is thus incorrect to have 'pushCoercionIntoLambda' apply the substitution from 'soe_subst' while discarding 'soe_inl' entirely, which is what was done in 15b311be. Instead, we change back pushCoercionIntoLambda to take an InScopeSet, and optimise the lambda before calling 'pushCoercionIntoLambda' to avoid mixing InExpr with OutExpr, or mixing two InExpr with different environments. We can then call 'soeZapSubst' without problems. Fixes #26588 #26589 - - - - - 84a087d5 by Sylvain Henry at 2025-11-28T17:35:28-05:00 Fix PIC jump tables on Windows (#24016) Avoid overflows in jump tables by using a base label closer to the jump targets. See added Note [Jump tables] - - - - - 82db7042 by Zubin Duggal at 2025-11-28T17:36:10-05:00 rts/linker/PEi386: Copy strings before they are inserted into LoadedDllCache. The original strings are temporary and might be freed at an arbitrary point. Fixes #26613 - - - - - ff3f0d09 by Ben Gamari at 2025-11-29T18:34:28-05:00 gitlab-ci: Run ghcup-metadata jobs on OpenCape runners This significantly reduces our egress traffic and makes the jobs significantly faster. - - - - - ef0dc33b by Matthew Pickering at 2025-11-29T18:35:10-05:00 Use 'OsPath' in getModificationTimeIfExists This part of the compiler is quite hot during recompilation checking in particular since the filepaths will be translated to a string. It is better to use the 'OsPath' native function, which turns out to be easy to do. - - - - - fa3bd0a6 by Georgios Karachalias at 2025-11-29T18:36:05-05:00 Use OsPath in PkgDbRef and UnitDatabase, not FilePath - - - - - 0d7c05ec by Ben Gamari at 2025-12-01T03:13:46-05:00 hadrian: Place user options after package arguments This makes it easier for the user to override the default package arguments with `UserSettings.hs`. Fixes #25821. ------------------------- Metric Decrease: T14697 ------------------------- - - - - - 3b2c4598 by Vladislav Zavialov at 2025-12-01T03:14:29-05:00 Namespace-specified wildcards in import/export lists (#25901) This change adds support for top-level namespace-specified wildcards `type ..` and `data ..` to import and export lists. Examples: import M (type ..) -- imports all type and class constructors from M import M (data ..) -- imports all data constructors and terms from M module M (type .., f) where -- exports all type and class constructors defined in M, -- plus the function 'f' The primary intended usage of this feature is in combination with module aliases, allowing namespace disambiguation: import Data.Proxy as T (type ..) -- T.Proxy is unambiguously the type constructor import Data.Proxy as D (data ..) -- D.Proxy is unambiguously the data constructor The patch accounts for the interactions of wildcards with: * Imports with `hiding` clauses * Import warnings -Wunused-imports, -Wdodgy-imports * Export warnings -Wduplicate-exports, -Wdodgy-exports Summary of the changes: 1. Move the NamespaceSpecifier type from GHC.Hs.Binds to GHC.Hs.Basic, making it possible to use it in more places in the AST. 2. Extend the AST (type: IE) with a representation of `..`, `type ..`, and `data ..` (constructor: IEWholeNamespace). Per the proposal, the plain `..` is always rejected with a dedicated error message. 3. Extend the grammar in Parser.y with productions for `..`, `type ..`, and `data ..` in both import and export lists. 4. Implement wildcard imports by updating the `filterImports` function in GHC.Rename.Names; the logic for IEWholeNamespace is roughly modeled after the Nothing (no explicit import list) case. 5. Implement wildcard exports by updating the `exports_from_avail` function in GHC.Tc.Gen.Export; the logic for IEWholeNamespace is closely modeled after the IEModuleContents case. 6. Refactor and extend diagnostics to report the new warnings and errors. See PsErrPlainWildcardImport, DodgyImportsWildcard, PsErrPlainWildcardExport, DodgyExportsWildcard, TcRnDupeWildcardExport. Note that this patch is specifically about top-level import/export items. Subordinate import/export items are left unchanged. - - - - - c71faa76 by Luite Stegeman at 2025-12-01T03:16:05-05:00 rts: Handle overflow of ELF section header string table If the section header string table is stored in a section greater than or equal to SHN_LORESERVE (0xff00), the 16-bit field e_shstrndx in the ELF header does not contain the section number, but rather an overflow value SHN_XINDEX (0xffff) indicating that we need to look elsewhere. This fixes the linker by not using e_shstrndx directly but calling elf_shstrndx, which correctly handles the SHN_XINDEX value. Fixes #26603 - - - - - ab20eb54 by Mike Pilgrem at 2025-12-01T22:46:55+00:00 Re CLC issue 292 Warn GHC.Internal.List.{init,last} are partial Also corrects the warning for `tail` to refer to `Data.List.uncons` (like the existing warning for `head`). In module `Settings.Warnings`, applies `-Wno-x-partial` to the `filepath`, and `parsec` packages (outside GHC's repository). Also bumps submodules. - - - - - fc1d7f79 by Jade Lovelace at 2025-12-02T11:04:09-05:00 docs: fix StandaloneKindSignatures in DataKinds docs These should be `type` as otherwise GHC reports a duplicate definition error. - - - - - beae879b by Rodrigo Mesquita at 2025-12-03T15:42:37+01:00 task: Substitute some datatypes for newtypes * Substitutes some data type declarations for newtype declarations * Adds comment to `LlvmConfigCache`, which must decidedly not be a newtype. Fixes #23555 - - - - - 3bd7dd44 by mangoiv at 2025-12-04T04:36:45-05:00 Renamer: reinstate the template haskell level check in notFound Out-of-scope names might be caused by a staging error, as is explained by Note [Out of scope might be a staging error] in GHC.Tc.Utils.Env.hs. This logic was assumed to be dead code after 217caad1 and has thus been removed. This commit reintroduces it and thus fixes issue #26099. - - - - - 0318010b by Zubin Duggal at 2025-12-04T04:37:27-05:00 testlib: Optionally include the way name in the expected output file This allows us to have different outputs for different ways. - - - - - 6d945fdd by Zubin Duggal at 2025-12-04T04:37:27-05:00 testsuite: Accept output of tests failing in ext-interp way due to differing compilation requirements Fixes #26552 - - - - - 0ffc5243 by Cheng Shao at 2025-12-04T04:38:09-05:00 devx: minor fixes for compile_flags.txt This patch includes minor fixes for compile_flags.txt to improve developer experience when using clangd as language server to hack on RTS C sources: - Ensure `-fPIC` is passed and `__PIC__` is defined, to be coherent with `-DDYNAMIC` and ensure the `__PIC__` guarded code paths are indexed - Add the missing `-DRtsWay` definition, otherwise a few source files like `RtsUtils.c` and `Trace.c` would produce clangd errors - - - - - e36a5fcb by Matthew Pickering at 2025-12-05T16:25:57-05:00 Add support for building bytecode libraries A bytecode library is a collection of bytecode files (.gbc) and a library which combines together additional object files. A bytecode library is created by invoking GHC with the `-bytecodelib` flag. A library can be created from in-memory `ModuleByteCode` linkables or by passing `.gbc` files as arguments on the command line. Fixes #26298 - - - - - 8f9ae339 by Matthew Pickering at 2025-12-05T16:25:57-05:00 Load bytecode libraries to satisfy package dependencies This commit allows you to use a bytecode library to satisfy a package dependency when using the interpreter. If a user enables `-fprefer-byte-code`, then if a package provides a bytecode library, that will be loaded and used to satisfy the dependency. The main change is to separate the relevant parts of the `LoaderState` into external and home package byte code. Bytecode is loaded into either the home package or external part (similar to HPT/EPS split), HPT bytecode can be unloaded. External bytecode is never unloaded. The unload function has also only been called with an empty list of "stable linkables" for a long time. It has been modified to directly implement a complete unloading of the home package bytecode linkables. At the moment, the bytecode libraries are found in the "library-dirs" field from the package description. In the future when `Cabal` implements support for "bytecode-library-dirs" field, we can read the bytecode libraries from there. No changes to the Cabal submodule are necessary at the moment. Four new tests are added in testsuite/tests/cabal, which generate fake package descriptions and test loading the libraries into GHCi. Fixes #26298 - - - - - 54458ce4 by mangoiv at 2025-12-05T16:26:50-05:00 ExplicitLevelImports: improve documentation of the code - more explicit names for variable names like `flg` or `topLevel` - don't pass the same value twice to functions - some explanations of interesting but undocumented code paths - adjust comment to not mention non-existent error message - - - - - c7061392 by mangoiv at 2025-12-05T16:27:42-05:00 driver: don't expect nodes to exist when checking paths between them In `mgQueryZero`, previously node lookups were expected to never fail, i.e. it was expected that when calculating the path between two nodes in a zero level import graph, both nodes would always exist. This is not the case, e.g. in some situations involving exact names (see the test-case). The fix is to first check whether the node is present in the graph at all, instead of panicking, just to report that there is no path. Closes #26568 - - - - - d6cf8463 by Peng Fan at 2025-12-06T11:06:28-05:00 NCG/LA64: Simplify genCCall into two parts genCCall is too long, so it's been simplified into two parts: genPrim and genLibCCall. Suggested by Andreas Klebinger - - - - - 9d371d23 by Matthew Pickering at 2025-12-06T11:07:09-05:00 hadrian: Use a response file to invoke GHC for dep gathering. In some cases we construct an argument list too long for GHC to handle directly on windows. This happens when we generate the dependency file because the command line will contain references to a large number of .hs files. To avoid this we now invoke GHC using a response file when generating dependencies to sidestep length limitations. Note that we only pass the actual file names in the dependency file. Why? Because this side-steps #26560 - - - - - 0043bfb0 by Marc Scholten at 2025-12-06T11:08:03-05:00 update xhtml to 3000.4.0.0 haddock-api: bump xhtml bounds haddock-api: use lazy text instead of string to support xhtml 3000.4.0.0 Bumping submodule xhtml to 3000.4.0.0 add xhtml to stage0Packages remove unused import of writeUtf8File Remove redundant import Update haddock golden files for xhtml 3000.4.0.0 Metric Decrease: haddock.Cabal haddock.base - - - - - fc958fc9 by Julian Ospald at 2025-12-06T11:08:53-05:00 rts: Fix object file format detection in loadArchive Commit 76d1041dfa4b96108cfdd22b07f2b3feb424dcbe seems to have introduced this bug, ultimately leading to failure of test T11788. I can only theorize that this test isn't run in upstream's CI, because they don't build a static GHC. The culprit is that we go through the thin archive, trying to follow the members on the filesystem, but don't re-identify the new object format of the member. This pins `object_fmt` to `NotObject` from the thin archive. Thanks to @angerman for spotting this. - - - - - 0f297f6e by mangoiv at 2025-12-06T11:09:44-05:00 users' guide: don't use f strings in the python script to ensure compatibility with python 3.5 - - - - - 3bfe7aa2 by Matthew Pickering at 2025-12-07T12:18:57-05:00 ci: Try using multi repl in ghc-in-ghci test This should be quite a bit faster than the ./hadrian/ghci command as it doesn't properly build all the dependencies. - - - - - 2ef1601a by Rodrigo Mesquita at 2025-12-07T12:19:38-05:00 Stack.Decode: Don't error on bitmap size 0 A RET_BCO may have a bitmap with no payload. In that case, the bitmap = 0. One can observe this by using -ddump-bcos and interpreting ``` main = pure () ``` Observe, for instance, that the BCO for this main function has size 0: ``` ProtoBCO Main.main#0: \u [] breakmain:Main,0() GHC.Internal.Base.pure GHC.Internal.Base.$fApplicativeIO GHC.Internal.Tuple.() bitmap: 0 [] BRK_FUN <breakarray> main:Main 0 <cc> PACK () 0 PUSH_G GHC.Internal.Base.$fApplicativeIO PUSH_APPLY_PP PUSH_G GHC.Internal.Base.pure ENTER ``` Perhaps we never tried to decode a stack in which a BCO like this was present. However, for the debugger, we want to decode stacks of threads stopped at breakpoints, and these kind of BCOs do get on a stack under e.g. `stg_apply_interp_info` frames. See the accompanying test in the next commit for an example to trigger the bug this commit fixes. Fixes #26640 - - - - - 747153d2 by Rodrigo Mesquita at 2025-12-07T12:19:38-05:00 Add test for #26640 - - - - - f487ae79 by Cheng Shao at 2025-12-08T19:07:33+01:00 hadrian: add support for building with UndefinedBehaviorSanitizer This patch adds a +ubsan flavour transformer to hadrian to build all stage1+ C/C++ code with UndefinedBehaviorSanitizer. This is particularly useful to catch potential undefined behavior in the RTS codebase. - - - - - 87851e99 by Cheng Shao at 2025-12-08T19:07:33+01:00 configure: bump LlvmMaxVersion to 22 This commit bumps LlvmMaxVersion to 22; 21.x releases have been available since Aug 26th, 2025 and there's no regressions with 21.x so far. This bump is also required for updating fedora image to 43. - - - - - 97aa6eca by Cheng Shao at 2025-12-08T19:07:33+01:00 ci: update alpine/fedora & add ubsan job This patch updates alpine image to 3.23, fedora image to 43, and adds a `x86_64-linux-fedora43-validate+debug_info+ubsan` job that's run in validate/nightly pipelines to catch undefined behavior in the RTS codebase. - - - - - 5b6a97af by Cheng Shao at 2025-12-08T19:07:33+01:00 rts: fix zero-length VLA undefined behavior in interpretBCO This commit fixes a zero-length VLA undefined behavior in interpretBCO, caught by UBSan: ``` +rts/Interpreter.c:3133:19: runtime variable length array bound evaluates to non-positive value 0 ``` - - - - - 096fd45c by Cheng Shao at 2025-12-08T19:07:33+01:00 rts: fix unaligned ReadSpB in interpretBCO This commit fixes unaligned ReadSpB in interpretBCO, caught by UBSan: ``` +rts/Interpreter.c:2174:64: runtime load of misaligned address 0x004202059dd1 for type 'StgWord', which requires 8 byte alignment ``` To perform proper unaligned read, we define StgUnalignedWord as a type alias of StgWord with aligned(1) attribute, and load StgUnalignedWord instead of StgWord in ReadSpB, so the C compiler is aware that we're not loading with natural alignment. - - - - - f14a8dfc by Cheng Shao at 2025-12-08T19:07:33+01:00 rts: fix signed integer overflow in subword arithmetic in interpretBCO - - - - - 269 changed files: - .gitlab-ci.yml - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - compile_flags.txt - compiler/GHC/ByteCode/Linker.hs - compiler/GHC/ByteCode/Serialize.hs - compiler/GHC/CmmToAsm/AArch64/RegInfo.hs - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/PPC/RegInfo.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Map/Type.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/Data/OsPath.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/CodeOutput.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Errors/Ppr.hs - compiler/GHC/Driver/Errors/Types.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/LlvmConfigCache.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/Phases.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.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/ImpExp.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Docs.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/Iface/Ext/Ast.hs - + compiler/GHC/Linker/ByteCode.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Linker/Types.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Errors/Ppr.hs - compiler/GHC/Parser/Errors/Types.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Prelude/Basic.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/Runtime/Debugger.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Settings.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Utils/Env.hs - compiler/GHC/Types/Basic.hs - compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/Hint.hs - compiler/GHC/Types/Hint/Ppr.hs - compiler/GHC/Types/Unique/FM.hs - compiler/GHC/Types/Unique/Set.hs - compiler/GHC/Types/Var/Env.hs - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/Home/PackageTable.hs - compiler/GHC/Unit/Info.hs - compiler/GHC/Unit/Module/Graph.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Utils/Misc.hs - compiler/GHC/Utils/Outputable.hs - compiler/Language/Haskell/Syntax/Extension.hs - compiler/Language/Haskell/Syntax/ImpExp.hs - compiler/ghc.cabal.in - configure.ac - docs/users_guide/9.16.1-notes.rst - docs/users_guide/conf.py - docs/users_guide/exts/data_kinds.rst - docs/users_guide/exts/explicit_namespaces.rst - docs/users_guide/exts/rank_polymorphism.rst - docs/users_guide/exts/type_families.rst - docs/users_guide/phases.rst - docs/users_guide/using-optimisation.rst - ghc/GHCi/UI.hs - ghc/Main.hs - hadrian/doc/flavours.md - hadrian/src/Builder.hs - hadrian/src/Flavour.hs - hadrian/src/Rules/ToolArgs.hs - hadrian/src/Settings.hs - hadrian/src/Settings/Builders/Ghc.hs - hadrian/src/Settings/Default.hs - hadrian/src/Settings/Warnings.hs - libraries/base/changelog.md - libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs - libraries/ghc-boot/GHC/Unit/Database.hs - libraries/ghc-internal/src/GHC/Internal/Float.hs - libraries/ghc-internal/src/GHC/Internal/List.hs - libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs - libraries/ghc-internal/src/GHC/Internal/System/IO.hs - libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs - libraries/template-haskell/vendored-filepath/System/FilePath/Posix.hs - libraries/template-haskell/vendored-filepath/System/FilePath/Windows.hs - libraries/xhtml - + rts/.ubsan-suppressions - 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