Simon Hengel pushed to branch wip/sol/MultiWayIf-docs at Glasgow Haskell Compiler / GHC Commits: 759fd15a by Andreas Klebinger at 2026-01-21T16:05:28-05:00 Don't build GHC with -Wcompat Without bumping the boot compiler the warnings it produces are often not actionable leading to pointless noise. Fixes #26800 - - - - - 3172db94 by Torsten Schmits at 2026-01-21T16:06:11-05:00 Use the correct field of ModOrigin when formatting error message listing hidden reexports - - - - - 485c12b2 by Cheng Shao at 2026-01-21T16:06:54-05:00 Revert "hadrian: handle findExecutable "" gracefully" This reverts commit 1e5752f64a522c4025365856d92f78073a7b3bba. The underlying issue has been fixed in https://github.com/haskell/directory/commit/75828696e7145adc09179111a0d631b9... and present since 1.3.9.0, and hadrian directory lower bound is 1.3.9.0, so we can revert our own in house hack now. - - - - - 5efb58dc by Cheng Shao at 2026-01-21T16:07:36-05:00 rts: fix typo in TICK_ALLOC_RTS This patch fixes a typo in the `TICK_ALLOC_RTS` macro, the original `bytes` argument was silently dropped. The Cmm code has its own version of `TICK_ALLOC_RTS` not affected by this typo, it affected the C RTS, and went unnoticed because the variable `n` happened to also be available at its call site. But the number was incorrect. Also fixes its call site since `WDS()` is not available in C. - - - - - c406ea69 by Cheng Shao at 2026-01-21T16:07:36-05:00 rts: remove broken & unused ALLOC_P_TICKY This patch removes the `ALLOC_P_TICKY` macro from the rts, it's unused, and its expanded code is already broken. - - - - - 34a27e20 by Simon Peyton Jones at 2026-01-21T16:08:17-05:00 Make the implicit-parameter class have representational role This MR addresses #26737, by making the built-in class IP have a representational role for its second parameter. See Note [IP: implicit parameter class] in ghc-internal:GHC.Internal.Classes.IP In fact, IP is (unfortunately, currently) exposed by base:GHC.Base, so we ran a quick CLC proposal to agree the change: https://github.com/haskell/core-libraries-committee/issues/385 Some (small) compilations get faster because they only need to load (small) interface file GHC.Internal.Classes.IP.hi, rather than (large) GHC.Internal.Classes.hi. Metric Decrease: T10421 T12150 T12425 T24582 T5837 T5030 - - - - - ca79475f by Cheng Shao at 2026-01-21T16:09:00-05:00 testsuite: avoid re.sub in favor of simple string replacements This patch refactors the testsuite driver and avoids the usage of re.sub in favor of simple string replacements when possible. The changes are not comprehensive, and there are still a lot of re.sub usages lingering around the tree, but this already addresses a major performance bottleneck in the testsuite driver that might has to do with quadratic or worse slowdown in cpython's regular expression engine when handling certain regex patterns with large strings. Especially on i386, and i386 jobs are the bottlenecks of all full-ci validate pipelines! Here are the elapsed times of testing x86_64/i386 with -j48 before this patch: x86_64: `Build completed in 6m06s` i386: `Build completed in 1h36m` And with this patch: x86_64: `Build completed in 4m55s` i386: `Build completed in 4m23s` Fixes #26786. Co-authored-by: Codex <codex@openai.com> - - - - - 88c93796 by Zubin Duggal at 2026-01-21T16:09:42-05:00 ghc-toolchain: Also configure windres on non-windows platforms. It may be needed for cross compilation. Fixes #24588 - - - - - 9788c0ec by Cheng Shao at 2026-01-21T16:10:24-05:00 ghci: print external interpreter trace messages to stderr instead of stdout This patch makes ghci print external interpreter trace messages to stderr instead of stdout, which is a much saner choice for diagnostic information. Closes #26807. - - - - - 0491f08a by Sylvain Henry at 2026-01-22T03:44:26-05:00 GC: don't use CAS without PARALLEL_GC on If we're not using the parallel GC, there is no reason to do a costly CAS. This was flagged as taking time in a perf profile. - - - - - 211a8f56 by Sylvain Henry at 2026-01-22T03:44:26-05:00 GC: suffix parallel GC with "par" instead of "thr" Avoid some potential confusion (see discussion in !15351). - - - - - 77a23cbd by fendor at 2026-01-22T03:45:08-05:00 Remove blanket ignore that covers libraries/ - - - - - 18bf7f5c by Léana Jiang at 2026-01-22T08:58:45-05:00 doc: update Flavour type in hadrian user-settings - - - - - 3d5a1365 by Cheng Shao at 2026-01-22T08:59:28-05:00 hadrian: add missing notCross predicate for stage0 -O0 There are a few hard-coded hadrian args that pass -O0 when compiling some heavy modules in stage0, which only makes sense when not cross-compiling and when cross-compiling we need properly optimized stage0 packages. So this patch adds the missing `notCross` predicate in those places. - - - - - ee937134 by Matthew Pickering at 2026-01-22T09:00:10-05:00 Fix ghc-experimental GHC.Exception.Backtrace.Experimental module This module wasn't added to the cabal file so it was never compiled or included in the library. - - - - - 1b490f5a by Zubin Duggal at 2026-01-22T09:00:53-05:00 hadrian: Add ghc-{experimental,internal}.cabal to the list of dependencies of the doc target We need these files to detect the version of these libraries Fixes #26738 - - - - - cdb74049 by Cheng Shao at 2026-01-22T14:52:36-05:00 rts: avoid Cmm loop to initialize Array#/SmallArray# Previously, `newArray#`/`newSmallArray#` called an RTS C function to allocate the `Array#`/`SmallArray#`, then used a Cmm loop to initialize the elements. Cmm doesn't have native for-loop so the code is a bit awkward, and it's less efficient than a C loop, since the C compiler can effectively vectorize the loop with optimizations. So this patch moves the loop that initializes the elements to the C side. `allocateMutArrPtrs`/`allocateSmallMutArrPtrs` now takes a new `init` argument and initializes the elements if `init` is non-NULL. - - - - - 4c784f00 by Cheng Shao at 2026-01-22T14:53:19-05:00 Fix testsuite run for +ipe flavour transformer This patch makes the +ipe flavour transformer pass the entire testsuite: - An RTS debug option `-DI` is added, the IPE trace information is now only printed with `-DI`. The test cases that do require IPE trace are now run with `-DI`. - The testsuite config option `ghc_with_ipe` is added, enabled when running the testsuite with `+ipe`, which skips a few tests that are sensitive to eventlog output, allocation patterns etc that can fail under `+ipe`. This is the first step towards #26799. Co-authored-by: Codex <codex@openai.com> - - - - - be8e5236 by Ben Gamari at 2026-01-23T03:28:45-05:00 hadrian: Bump QuickCheck upper bound This patch bumps QuickCheck upper bound to 2.18. selftest rule manually tested to work with current latest QuickCheck-2.17.1.0. - - - - - 5aa328fb by Zubin Duggal at 2026-01-23T03:29:30-05:00 Add genindex to index.rst. This adds a link to the index in the navigation bar. Fixes #26437 - - - - - 917ab8ff by Oleg Grenrus at 2026-01-23T10:52:55-05:00 Export labelThread from Control.Concurrent - - - - - 3f5e8d80 by Cheng Shao at 2026-01-23T10:53:37-05:00 ci: only push perf notes on master/release branches This patch fixes push_perf_notes logic in ci.sh to only push perf notes on master/release branches. We used to unconditionally push perf notes even in MRs, but the perf numbers in the wip branches wouldn't be used as baseline anyway, plus this is causing a space leak in the ghc-performance-notes repo. See #25317 for the perf notes repo size problem. Co-authored-by: Codex <codex@openai.com> - - - - - 414b9593 by Cheng Shao at 2026-01-24T07:11:51-05:00 ci: remove duplicate keys in .gitlab-ci.yml This patch removes accidentally duplicate keys in `.gitlab-ci.yml`. The YAML spec doesn't allow duplicate keys in the first place, and according to GitLab docs (https://docs.gitlab.com/ci/yaml/yaml_optimization/#anchors), the latest key overrides the earlier entries. - - - - - e5cb5491 by Cheng Shao at 2026-01-24T07:12:34-05:00 hadrian: drop obsolete configure/make builder logic for libffi This patch drops obsolete hadrian logic around `Configure libffiPath`/`Make libffiPath` builders, they are no longer needed after libffi-clib has landed. Closes #26815. - - - - - 2d160222 by Simon Hengel at 2026-01-24T07:13:17-05:00 Fix typo in roles.rst - - - - - 56db94f7 by Peter Trommler at 2026-01-26T11:26:18+01:00 PPC NCG: Generate clear right insn at arch width The clear right immediate (clrrxi) is only available in word and doubleword width. Generate clrrxi instructions at architecture width for all MachOp widths. Fixes #24145 - - - - - 5957a8ad by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00 Add operations for obtaining operating-system handles This contribution implements CLC proposal #369. It adds operations for obtaining POSIX file descriptors and Windows handles that underlie Haskell handles. Those operating system handles can also be obtained without such additional operations, but this is more involved and, more importantly, requires using internals. - - - - - 86a0510c by Greg Steuck at 2026-01-27T06:12:34-05:00 Move flags to precede patterns for grep and read files directly This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools. There's no reason to use cat and pipe where direct file argument works. - - - - - 50761451 by Cheng Shao at 2026-01-27T21:51:23-05:00 ci: update darwin boot ghc to 9.10.3 This patch updates darwin boot ghc to 9.10.3, along with other related updates, and pays off some technical debt here: - Update `nixpkgs` and use the `nixpkgs-25.05-darwin` channel. - Update the `niv` template. - Update LLVM to 21 and update `llvm-targets` to reflect LLVM 21 layout changes for arm64/x86_64 darwin targets. - Use `stdenvNoCC` to prevent nix packaged apple sdk from being used by boot ghc, and manually set `DEVELOPER_DIR`/`SDKROOT` to enforce the usage of system-wide command line sdk for macos. - When building nix derivation for boot ghc, run `configure` via the `arch` command so that `configure` and its subprocesses pick up the manually specified architecture. - Remove the previous horrible hack that obliterates `configure` to make autoconf test result in true. `configure` now properly does its job. - Remove the now obsolete configure args and post install settings file patching logic. - Use `scheme-small` for texlive to avoid build failures in certain unused texlive packages, especially on x86_64-darwin. - - - - - 94dcd15e by Matthew Pickering at 2026-01-27T21:52:05-05:00 Evaluate backtraces for "error" exceptions at the moment they are thrown See Note [Capturing the backtrace in throw] and Note [Hiding precise exception signature in throw] which explain the implementation. This commit makes `error` and `throw` behave the same with regard to backtraces. Previously, exceptions raised by `error` would not contain useful IPE backtraces. I did try and implement `error` in terms of `throw` but it started to involve putting diverging functions into hs-boot files, which seemed to risky if the compiler wouldn't be able to see if applying a function would diverge. CLC proposal: https://github.com/haskell/core-libraries-committee/issues/383 Fixes #26751 - - - - - ef35e3ea by Teo Camarasu at 2026-01-27T21:52:46-05:00 ghc-internal: move all Data instances to Data.Data Most instances of Data are defined in GHC.Internal.Data.Data. Let's move all remaining instance there. This moves other modules down in the dependency hierarchy allowing for more parallelism, and it decreases the likelihood that we would need to load this heavy .hi file if we don't actually need it. Resolves #26830 Metric Decrease: T12227 T16875 - - - - - 5e0ec555 by sheaf at 2026-01-28T06:56:38-05:00 Add test case for #25679 This commit adds the T25679 test case. The test now passes, thanks to commit 1e53277af36d3f0b6ad5491f70ffc5593a49dcfd. Fixes #25679 - - - - - f1cd1611 by sheaf at 2026-01-28T06:56:38-05:00 Improve defaulting of representational equalities This commit makes the defaulting of representational equalities, introduced in 1e53277a, a little bit more robust. Now, instead of calling the eager unifier, it calls the full-blown constraint solver, which means that it can handle some subtle situations, e.g. involving functional dependencies and type-family injectivity annotations, such as: type family F a = r | r -> a type instance F Int = Bool [W] F beta ~R Bool - - - - - 25edf516 by sheaf at 2026-01-28T06:56:38-05:00 Improve errors for unsolved representational equalities This commit adds a new field of CtLoc, CtExplanations, which allows the typechecker to leave some information about what it has done. For the moment, it is only used to improve error messages for unsolved representational equalities. The typechecker will now accumulate, when unifying at representational role: - out-of-scope newtype constructors, - type constructors that have nominal role in a certain argument, - over-saturated type constructors, - AppTys, e.g. `c a ~R# c b`, to report that we must assume that 'c' has nominal role in its parameters, - data family applications that do not reduce, potentially preventing newtype unwrapping. Now, instead of having to re-construct the possible errors after the fact, we simply consult the CtExplanations field. Additionally, this commit modifies the typechecker error messages that concern out-of-scope newtype constructors. The error message now depends on whether we have an import suggestion to provide to the user: - If we have an import suggestion for the newtype constructor, the message will be of the form: The data constructor MkN of the newtype N is out of scope Suggested fix: add 'MkN' to the import list in the import of 'M' - If we don't have any import suggestions, the message will be of the form: NB: The type 'N' is an opaque newtype, whose constructor is hidden Fixes #15850, #20289, #20468, #23731, #25949, #26137 - - - - - 4d0e6da1 by Simon Peyton Jones at 2026-01-28T06:57:19-05:00 Fix two bugs in short-cut constraint solving There are two main changes here: * Use `isSolvedWC` rather than `isEmptyWC` in `tryShortCutSolver` The residual constraint may have some fully-solved, but still-there implications, and we don't want them to abort short cut solving! That bug caused #26805. * In the short-cut solver, we abandon the fully-solved residual constraint; but we may thereby lose track of Givens that are needed, and either report them as redundant or prune evidence bindings that are in fact needed. This bug stopped the `constraints` package from compiling; see the trail in !15389. The second bug led me to (another) significant refactoring of the mechanism for tracking needed EvIds. See the new Note [Tracking needed EvIds] in GHC.Tc.Solver.Solve It's simpler and much less head-scratchy now. Some particulars: * An EvBindsVar now tracks NeededEvIds * We deal with NeededEvIds for an implication only when it is fully solved. Much simpler! * `tryShortCutTcS` now takes a `TcM WantedConstraints` rather than `TcM Bool`, so that is can plumb the needed EvIds correctly. * Remove `ic_need` and `ic_need_implic` from Implication (hooray), and add `ics_dm` and `ics_non_dm` to `IC_Solved`. Pure refactor * Shorten data constructor `CoercionHole` to `CH`, following general practice in GHC. * Rename `EvBindMap` to `EvBindsMap` for consistency - - - - - 662480b7 by Cheng Shao at 2026-01-28T06:58:00-05:00 ci: use debian validate bindists instead of fedora release bindists in testing stage This patch changes the `abi-test`, `hadrian-multi` and `perf` jobs in the full-ci pipeline testing stage to use debian validate bindists instead of fedora release bindists, to increase pipeline level parallelism and allow full-ci pipelines to complete earlier. Closes #26818. - - - - - 39581ec6 by Cheng Shao at 2026-01-28T06:58:40-05:00 ci: run perf test with -j$cores This patch makes the perf ci job compile Cabal with -j$cores to speed up the job. - - - - - 607b287b by Wolfgang Jeltsch at 2026-01-28T15:41:53+02:00 Remove `GHC.Desugar` from `base` `GHC.Desugar` was deprecated and should have been removed in GHC 9.14. However, the removal was forgotten, although there was a code block that was intended to trigger a compilation error when the GHC version in use was 9.14 or later. This code sadly didn’t work, because the `__GLASGOW_HASKELL__` macro was misspelled as `__GLASGOW_HASKELL`. - - - - - e8f5a45d by sterni at 2026-01-29T04:19:18-05:00 users_guide: fix runtime error during build with Sphinx 9.1.0 Appears that pathto is stricter about what it accepts now. Tested Sphinx 8.2.3 and 9.1.0 on the ghc-9.10 branch. Resolves #26810. Co-authored-by: Martin Weinelt <hexa@darmstadt.ccc.de> - - - - - ce2d62fb by Jessica Clarke at 2026-01-29T19:48:51-05:00 PPC NCG: Use libcall for 64-bit cmpxchg on 32-bit PowerPC There is no native instruction for this, and even if there were a register pair version we could use, the implementation here is assuming the values fit in a single register, and we end up only using / defining the low halves of the registers. Fixes: b4d39adbb5 ("PrimOps: Add CAS op for all int sizes") Fixes: #23969 - - - - - 43d97761 by Michael Karcher at 2026-01-29T19:49:43-05:00 NCG for PPC: add pattern for CmmRegOff to iselExpr64 Closes #26828 - - - - - aeeb4a20 by Matthew Pickering at 2026-01-30T11:42:47-05:00 determinism: Use deterministic map for Strings in TyLitMap When generating typeable evidence the types we need evidence for all cached in a TypeMap, the order terms are retrieved from a type map determines the order the bindings appear in the program. A TypeMap is quite diligent to use deterministic maps, apart from in the TyLitMap, which uses a UniqFM for storing strings, whose ordering depends on the Unique of the FastString. This can cause non-deterministic .hi and .o files. An unexpected side-effect is the error message but RecordDotSyntaxFail8 changing. I looked into this with Sam and this change caused the constraints to be solved in a different order which results in a slightly different error message. I have accepted the new test, since the output before was non-deterministic and the new output is consistent with the other messages in that file. Fixes #26846 - - - - - 9e4d70c2 by Andrew Lelechenko at 2026-01-30T11:43:29-05:00 Upgrade text submodule to 2.1.4 - - - - - ba210120 by Simon Hengel at 2026-01-31T19:20:53+05:30 Update the documentation for MultiWayIf so that it matches the implementation - - - - - 198 changed files: - .gitignore - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/darwin/nix/sources.json - .gitlab/darwin/toolchain.nix - compiler/GHC/Builtin/Names.hs - compiler/GHC/CmmToAsm/PPC/CodeGen.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Map/Type.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCo/Subst.hs - compiler/GHC/Core/TyCo/Tidy.hs - compiler/GHC/Core/TyCon/RecWalk.hs - compiler/GHC/Data/Maybe.hs - compiler/GHC/HsToCore/Pmc/Solver.hs - compiler/GHC/Rename/Unbound.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/Default.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Instance/Family.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/Solver/InertSet.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/TyCl/Instance.hs - compiler/GHC/Tc/Types/Constraint.hs - compiler/GHC/Tc/Types/CtLoc.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Zonk/TcType.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/RepType.hs - compiler/GHC/Types/Var.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Utils/Monad.hs - compiler/GHC/Utils/Trace.hs - compiler/ghc.cabal.in - docs/users_guide/9.16.1-notes.rst - docs/users_guide/exts/multiway_if.rst - docs/users_guide/exts/roles.rst - docs/users_guide/index.rst - docs/users_guide/rtd-theme/layout.html - docs/users_guide/runtime_control.rst - hadrian/doc/user-settings.md - hadrian/hadrian.cabal - hadrian/src/Context.hs - hadrian/src/Flavour.hs - hadrian/src/Hadrian/Utilities.hs - hadrian/src/Rules/Docspec.hs - hadrian/src/Rules/Documentation.hs - hadrian/src/Rules/Lint.hs - hadrian/src/Settings/Builders/Configure.hs - hadrian/src/Settings/Builders/Ghc.hs - hadrian/src/Settings/Builders/Make.hs - hadrian/src/Settings/Builders/RunTest.hs - hadrian/src/Settings/Packages.hs - libraries/base/base.cabal.in - libraries/base/changelog.md - libraries/base/src/Control/Concurrent.hs - − libraries/base/src/GHC/Desugar.hs - + libraries/base/src/System/IO/OS.hs - libraries/base/src/System/Timeout.hs - libraries/base/tests/IO/all.T - + libraries/base/tests/IO/osHandles001FileDescriptors.hs - + libraries/base/tests/IO/osHandles001FileDescriptors.stdout - + libraries/base/tests/IO/osHandles001WindowsHandles.hs - + libraries/base/tests/IO/osHandles001WindowsHandles.stdout - + libraries/base/tests/IO/osHandles002FileDescriptors.hs - + libraries/base/tests/IO/osHandles002FileDescriptors.stderr - + libraries/base/tests/IO/osHandles002FileDescriptors.stdin - + libraries/base/tests/IO/osHandles002FileDescriptors.stdout - + libraries/base/tests/IO/osHandles002WindowsHandles.hs - + libraries/base/tests/IO/osHandles002WindowsHandles.stderr - + libraries/base/tests/IO/osHandles002WindowsHandles.stdin - + libraries/base/tests/IO/osHandles002WindowsHandles.stdout - libraries/base/tests/T23454.stderr - libraries/base/tests/perf/Makefile - libraries/ghc-compact/tests/all.T - libraries/ghc-experimental/ghc-experimental.cabal.in - libraries/ghc-experimental/src/GHC/Exception/Backtrace/Experimental.hs - libraries/ghc-internal/ghc-internal.cabal.in - libraries/ghc-internal/src/GHC/Internal/Classes.hs - + libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs - libraries/ghc-internal/src/GHC/Internal/Data/Data.hs - libraries/ghc-internal/src/GHC/Internal/Err.hs - libraries/ghc-internal/src/GHC/Internal/Exts.hs - libraries/ghc-internal/src/GHC/Internal/Functor/ZipList.hs - + libraries/ghc-internal/src/GHC/Internal/System/IO/OS.hs - libraries/ghc-internal/tests/backtraces/all.T - libraries/ghc-internal/tests/stack-annotation/all.T - + libraries/ghc-internal/tests/stack-annotation/ann_frame005.hs - + libraries/ghc-internal/tests/stack-annotation/ann_frame005.stdout - libraries/ghci/GHCi/Server.hs - libraries/text - llvm-targets - rts/AllocArray.c - rts/AllocArray.h - rts/ClosureTable.c - rts/Heap.c - rts/PrimOps.cmm - rts/RtsFlags.c - rts/Threads.c - rts/Trace.c - rts/Weak.c - rts/include/Cmm.h - rts/include/rts/Flags.h - rts/include/stg/Ticky.h - rts/rts.cabal - rts/sm/Evac.c - rts/sm/Evac_thr.c → rts/sm/Evac_par.c - rts/sm/Scav_thr.c → rts/sm/Scav_par.c - rts/sm/Storage.c - testsuite/driver/runtests.py - testsuite/driver/testglobals.py - testsuite/driver/testlib.py - testsuite/driver/testutil.py - + testsuite/tests/default/T25825.hs - testsuite/tests/default/all.T - testsuite/tests/deriving/should_fail/T1496.stderr - testsuite/tests/deriving/should_fail/T4846.stderr - testsuite/tests/deriving/should_fail/T5498.stderr - 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