[Git][ghc/ghc][wip/romes/26202] 74 commits: T22033 is only relevant if the word size is 64-bit

Rodrigo Mesquita pushed to branch wip/romes/26202 at Glasgow Haskell Compiler / GHC Commits: f7adfed2 by ARATA Mizuki at 2025-10-08T08:37:24-04:00 T22033 is only relevant if the word size is 64-bit Fixes #25497 - - - - - ff1650c9 by Ben Gamari at 2025-10-08T08:38:07-04:00 rts/posix: Enforce iteration limit on heap reservation logic Previously we could loop indefinitely when attempting to get an address space reservation for our heap. Limit the logic to 8 iterations to ensure we instead issue a reasonable error message. Addresses #26151. - - - - - 01844557 by Ben Gamari at 2025-10-08T08:38:07-04:00 rts/posix: Hold on to low reservations when reserving heap Previously when the OS gave us an address space reservation in low memory we would immediately release it and try again. However, on some platforms this meant that we would get the same allocation again in the next iteration (since mmap's `hint` argument is just that, a hint). Instead we now hold on to low reservations until we have found a suitable heap reservation. Fixes #26151. - - - - - b2c8d052 by Sven Tennie at 2025-10-08T08:38:47-04:00 Build terminfo only in upper stages in cross-builds (#26288) Currently, there's no way to provide library paths for [n]curses for both - build and target - in cross-builds. As stage0 is only used to build upper stages, it should be fine to build terminfo only for them. This re-enables building cross-compilers with terminfo. - - - - - c58f9a61 by Julian Ospald at 2025-10-08T08:39:36-04:00 ghc-toolchain: Drop `ld.gold` from merge object command It's deprecated. Also see #25716 - - - - - 2b8baada by sheaf at 2025-10-08T18:23:37-04:00 Improvements to 'mayLookIdentical' This commit makes significant improvements to the machinery that decides when we should pretty-print the "invisible bits" of a type, such as: - kind applications, e.g. '@k' in 'Proxy @k ty' - RuntimeReps, e.g. 'TYPE r' - multiplicities and linear arrows 'a %1 -> b' To do this, this commit refactors 'mayLookIdentical' to return **which** of the invisible bits don't match up, e.g. in (a %1 -> b) ~ (a %Many -> b) we find that the invisible bit that doesn't match up is a multiplicity, so we should set 'sdocLinearTypes = True' when pretty-printing, and with e.g. Proxy @k1 ~ Proxy @k2 we find that the invisible bit that doesn't match up is an invisible TyCon argument, so we set 'sdocPrintExplicitKinds = True'. We leverage these changes to remove the ad-hoc treatment of linearity of data constructors with 'dataConDisplayType' and 'dataConNonLinearType'. This is now handled by the machinery of 'pprWithInvisibleBits'. Fixes #26335 #26340 - - - - - 129ce32d by sheaf at 2025-10-08T18:23:37-04:00 Store SDoc context in SourceError This commits modifies the SourceError datatype which is used for throwing and then reporting exceptions by storing all the info we need to be able to print the SDoc, including whether we should print with explicit kinds, explicit runtime-reps, etc. This is done using the new datatype: data SourceErrorContext = SEC !DiagOpts !(DiagnosticOpts GhcMessage) Now, when we come to report an error (by handling the exception), we have access to the full context we need. Fixes #26387 - - - - - f9790ca8 by Ben Gamari at 2025-10-08T18:24:19-04:00 gitlab-ci: Make RELEASE_JOB an input Rather than an undocumented variable. - - - - - 14281a22 by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/nonmoving: Fix comment spelling - - - - - bedd38b0 by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/nonmoving: Use atomic operations to update bd->flags - - - - - 215d6841 by Ben Gamari at 2025-10-11T14:06:47-04:00 nonmoving: Use get_itbl instead of explicit loads This is cleaner and also fixes unnecessary (and unsound) use of `volatile`. - - - - - 2c94aa3a by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/Scav: Handle WHITEHOLEs in scavenge_one `scavenge_one`, used to scavenge mutable list entries, may encounter `WHITEHOLE`s when the non-moving GC is in use via two paths: 1. when an MVAR is being marked concurrently 2. when the object belongs to a chain of selectors being short-cutted. Fixes #26204. - - - - - 6bd8155c by Matthew Pickering at 2025-10-11T14:07:29-04:00 Add support for generating bytecode objects This commit adds the `-fwrite-byte-code` option which makes GHC emit a `.gbc` file which contains a serialised representation of bytecode. The bytecode can be loaded by the compiler to avoid having to reinterpret a module when using the bytecode interpreter (for example, in GHCi). There are also the new options: * -gbcdir=<DIR>: Specify the directory to place the gbc files * -gbcsuf=<suffix>: Specify the suffix for gbc files The option `-fbyte-code-and-object-code` now implies `-fwrite-byte-code`. These performance tests fail due to https://github.com/haskell/directory/issues/204 ------------------------- Metric Increase: MultiComponentModules MultiLayerModules MultiComponentModulesRecomp MultiLayerModulesRecomp MultiLayerModulesTH_Make MultiLayerModulesTH_OneShot T13701 ------------------------- The bytecode serialisation part was implemented by Cheng Shao Co-authored-by: Cheng Shao - - - - - dc8f9599 by Matthew Pickering at 2025-10-11T14:07:30-04:00 Revert "Add a perf test for #26425" This test has a large memory spike currently, which makes the test sensitive, since if you allocate a little more or less, the precise location where GC happens shifts and you observe a different part of the spike. Andreas told me to revert the patch for now, and he will add it back when he fixes the memory spike. This reverts commit 41bdb16fd083110a06507248f648c507a2feb4af. - - - - - e10dcd65 by Sven Tennie at 2025-10-12T10:24:56+00:00 T22859: Increase threadDelay for small machines The previously used thread delay led to failures on my RISC-V test setups. - - - - - d59ef6b6 by Hai / @BestYeen at 2025-10-14T21:51:14-04:00 Change Alex and Happy m4 scripts to display which version was found in the system, adapt small formatting details in Happy script to be more like the Alex script again. - - - - - c98abb6a by Hai / @BestYeen at 2025-10-14T21:52:08-04:00 Update occurrences of return to pure and add a sample for redefining :m to mean :main - - - - - 70ee825a by Cheng Shao at 2025-10-14T21:52:50-04:00 testsuite: fix T3586 for non-SSE3 platforms `T3586.hs` contains `-fvia-C -optc-msse3` which I think is a best-effort basis to harvest the C compiler's auto vectorization optimizations via the C backend back when the test was added. The `-fvia-C` part is now a deprecated no-op because GHC can't fall back to the C backend on a non-unregisterised build, and `-optc-msse3` might actually cause the test to fail on non x86/x64 platforms, e.g. recent builds of wasi-sdk would report `wasm32-wasi-clang: error: unsupported option '-msse3' for target 'wasm32-unknown-wasi'`. So this patch cleans up this historical cruft. `-fvia-C` is removed, and `-optc-msse3` is only passed when cpuid contains `pni` (which indicates support of SSE3). - - - - - 4be32153 by Teo Camarasu at 2025-10-15T08:06:09-04:00 Add submodules for template-haskell-lift and template-haskell-quasiquoter These two new boot libraries expose stable subsets of the template-haskell interface. This is an implemenation of the GHC proposal https://github.com/ghc-proposals/ghc-proposals/pull/696 Work towards #25262 - - - - - 0c00c9c3 by Ben Gamari at 2025-10-15T08:06:51-04:00 rts: Eliminate uses of implicit constant arrays Folding of `const`-sized variable-length arrays to a constant-length array is a gnu extension which clang complains about. Closes #26502. - - - - - bf902a1d by Fendor at 2025-10-15T16:00:59-04:00 Refactor distinct constructor tables map construction Adds `GHC.Types.Unique.FM.alterUFM_L`, `GHC.Types.Unique.DFM.alterUDFM_L` `GHC.Data.Word64Map.alterLookup` to support fusion of distinct constructor data insertion and lookup during the construction of the `DataCon` map in `GHC.Stg.Debug.numberDataCon`. Co-authored-by: Fendor Co-authored-by: Finley McIlwaine - - - - - b3585ba1 by Fendor at 2025-10-15T16:00:59-04:00 Allow per constructor refinement of distinct-constructor-tables Introduce `-fno-distinct-constructor-tables`. A distinct constructor table configuration is built from the combination of flags given, in order. For example, to only generate distinct constructor tables for a few specific constructors and no others, just pass `-fdistinct-constructor-tables-only=C1,...,CN`. This flag can be supplied multiple times to extend the set of constructors to generate a distinct info table for. You can disable generation of distinct constructor tables for all configurations by passing `-fno-distinct-constructor-tables`. The various configurations of these flags is included in the `DynFlags` fingerprints, which should result in the expected recompilation logic. Adds a test that checks for distinct tables for various given or omitted constructors. Updates CountDepsAst and CountDepsParser tests to account for new dependencies. Fixes #23703 Co-authored-by: Fendor Co-authored-by: Finley McIlwaine - - - - - e17dc695 by fendor at 2025-10-15T16:01:41-04:00 Fix typos in haddock documentation for stack annotation API - - - - - f85058d3 by Zubin Duggal at 2025-10-17T13:50:52+05:30 compiler: Attempt to systematize Unique tags by introducing an ADT for each different tag Fixes #26264 Metric Decrease: T9233 - - - - - c85c845d by sheaf at 2025-10-17T22:35:32-04:00 Don't prematurely final-zonk PatSyn declarations This commit makes GHC hold off on the final zonk for pattern synonym declarations, in 'GHC.Tc.TyCl.PatSyn.tc_patsyn_finish'. This accommodates the fact that pattern synonym declarations without a type signature can contain unfilled metavariables, e.g. if the RHS of the pattern synonym involves view-patterns whose type mentions promoted (level 0) metavariables. Just like we do for ordinary function bindings, we should allow these metavariables to be settled later, instead of eagerly performing a final zonk-to-type. Now, the final zonking-to-type for pattern synonyms is performed in GHC.Tc.Module.zonkTcGblEnv. Fixes #26465 - - - - - ba3e5bdd by Rodrigo Mesquita at 2025-10-18T16:57:18-04:00 Move code-gen aux symbols from ghc-internal to rts These symbols were all previously defined in ghc-internal and made the dependency structure awkward, where the rts may refer to some of these symbols and had to work around that circular dependency the way described in #26166. Moreover, the code generator will produce code that uses these symbols! Therefore, they should be available in the rts: PRINCIPLE: If the code generator may produce code which uses this symbol, then it should be defined in the rts rather than, say, ghc-internal. That said, the main motivation is towards fixing #26166. Towards #26166. Pre-requisite of !14892 - - - - - f31de2a9 by Ben Gamari at 2025-10-18T16:57:18-04:00 rts: Avoid static symbol references to ghc-internal This resolves #26166, a bug due to new constraints placed by Apple's linker on undefined references. One source of such references in the RTS is the many symbols referenced in ghc-internal. To mitigate #26166, we make these references dynamic, as described in Note [RTS/ghc-internal interface]. Fixes #26166 Co-authored-by: Rodrigo Mesquita Co-authored-by: Cheng Shao - - - - - 43fdfddc by Ben Gamari at 2025-10-18T16:57:18-04:00 compiler: Rename isMathFun -> isLibcFun This set includes more than just math functions. - - - - - 4ed5138f by Ben Gamari at 2025-10-18T16:57:18-04:00 compiler: Add libc allocator functions to libc_funs Prototypes for these are now visible from `Prim.h`, resulting in multiple-declaration warnings in the unregisterised job. - - - - - 9a0a076b by Ben Gamari at 2025-10-18T16:57:18-04:00 rts: Minimize header dependencies of Prim.h Otherwise we will end up with redundant and incompatible declarations resulting in warnings during the unregisterised build. - - - - - 26b8a414 by Diego Antonio Rosario Palomino at 2025-10-18T16:58:10-04:00 Cmm Parser: Fix incorrect example in comment The Parser.y file contains a comment with an incorrect example of textual Cmm (used in .cmm files). This commit updates the comment to ensure it reflects valid textual Cmm syntax. Fixes #26313 - - - - - d4a9d6d6 by ARATA Mizuki at 2025-10-19T18:43:47+09:00 Handle implications between x86 feature flags This includes: * Multiple -msse* options can be specified * -mavx implies -msse4.2 * -mavx2 implies -mavx * -mfma implies -mavx * -mavx512f implies -mavx2 and -mfma * -mavx512{cd,er,pf} imply -mavx512f Closes #24989 Co-authored-by: sheaf - - - - - c9b8465c by Cheng Shao at 2025-10-20T10:16:00-04:00 wasm: workaround WebKit bug in dyld This patch works around a WebKit bug and allows dyld to run on WebKit based platforms as well. See added note for detailed explanation. Co-authored-by: Codex - - - - - 91b6be10 by Julian Ospald at 2025-10-20T18:21:03-04:00 Improve error handling in 'getPackageArchives' When the library dirs in the package conf files are not set up correctly, the JS linker will happily ignore such packages and not link against them, although they're part of the link plan. Fixes #26383 - - - - - 6c5269da by Sven Tennie at 2025-10-20T18:21:44-04:00 Align coding style Improve readability by using the same style for all constructor calls in this function. - - - - - 3d305889 by Sven Tennie at 2025-10-20T18:21:44-04:00 Reduce complexity by removing joins with mempty ldArgs, cArgs and cppArgs are all `mempty`. Thus concatenating them adds nothing but some complexity while reading the code. - - - - - 38d65187 by Matthew Pickering at 2025-10-21T13:12:20+01:00 Fix stack decoding when using profiled runtime There are three fixes in this commit. * We need to replicate the `InfoTable` and `InfoTableProf` approach for the other stack constants (see the new Stack.ConstantsProf file). * Then we need to appropiately import the profiled or non-profiled versions. * Finally, there was an incorrect addition in `stackFrameSize`. We need to cast after performing addition on words. Fixes #26507 - - - - - 17231bfb by fendor at 2025-10-21T13:12:20+01:00 Add regression test for #26507 - - - - - 4f5bf93b by Simon Peyton Jones at 2025-10-25T04:05:34-04:00 Postscript to fix for #26255 This MR has comments only - - - - - 6ef22fa0 by IC Rainbow at 2025-10-26T18:23:01-04:00 Add SIMD primops for bitwise logical operations This adds 128-bit wide and/or/xor instructions for X86 NCG, with both SSE and AVX encodings. ``` andFloatX4# :: FloatX4# -> FloatX4# -> FloatX4# -- andps / vandps andDoubleX2# :: DoubleX2# -> DoubleX2# -> DoubleX2# -- andpd / vandpd andInt8X16# :: Int8X16# -> Int8X16# -> Int8X16# -- pand / vpand ``` The new primops are available on ARM when using LLVM backend. Tests added: - simd015 (floats and doubles) - simd016 (integers) - simd017 (words) Fixes #26417 - - - - - fbdc623a by sheaf at 2025-10-26T18:23:52-04:00 Add hints for unsolved HasField constraints This commit adds hints and explanations for unsolved 'HasField' constraints. GHC will now provide additional explanations for an unsolved constraint of the form 'HasField fld_name rec_ty fld_ty'; the details are laid out in Note [Error messages for unsolved HasField constraints], but briefly: 1. Provide similar name suggestions (e.g. mis-spelled field name) and import suggestions (record field not in scope). These result in actionable 'GhcHints', which is helpful to provide code actions in HLS. 2. Explain why GHC did not solve the constraint, e.g.: - 'fld_name' is not a string literal (e.g. a type variable) - 'rec_ty' is a TyCon without any fields, e.g. 'Int' or 'Bool'. - 'fld_ty' contains existentials variables or foralls. - The record field is a pattern synonym field (GHC does not generate HasField instances for those). - 'HasField' is a custom 'TyCon', not actually the built-in 'HasField' typeclass from 'GHC.Records'. On the way, we slightly refactor the mechanisms for import suggestions in GHC.Rename.Unbound. This is to account for the fact that, for 'HasField', we don't care whether the field is imported qualified or unqualified. 'importSuggestions' was refactored, we now have 'sameQualImportSuggestions' and 'anyQualImportSuggestions'. Fixes #18776 #22382 #26480 - - - - - 99d5707f by sheaf at 2025-10-26T18:23:52-04:00 Rename PatSyn MatchContext to PatSynCtx to avoid punning - - - - - 5dc2e9ea by Julian Ospald at 2025-10-27T18:17:23-04:00 Skip uniques test if sources are not available - - - - - 544b9ec9 by Vladislav Zavialov at 2025-10-27T18:18:06-04:00 Re-export GHC.Hs.Basic from GHC.Hs Clean up some import sections in GHC by re-exporting GHC.Hs.Basic from GHC.Hs. - - - - - 643ce801 by Julian Ospald at 2025-10-28T18:18:55-04:00 rts: remove unneccesary cabal flags We perform those checks via proper autoconf macros instead that do the right thing and then add those libs to the rts buildinfo. - - - - - d69ea8fe by Vladislav Zavialov at 2025-10-28T18:19:37-04:00 Test case for #17705 Starting with GHC 9.12 (the first release to include 5745dbd3), all examples in this ticket are handled as expected. - - - - - 4038a28b by Andreas Klebinger at 2025-10-30T12:38:52-04:00 Add a perf test for #26425 - - - - - f997618e by Andreas Klebinger at 2025-10-30T12:38:52-04:00 OccAnal: Be stricter for better compiler perf. In particular we are now stricter: * When combining usageDetails. * When computing binder info. In combineUsageDetails when combining the underlying adds we compute a new `LocalOcc` for each entry by combining the two existing ones. Rather than wait for those entries to be forced down the road we now force them immediately. Speeding up T26425 by about 10% with little effect on the common case. We also force binders we put into the Core AST everywhere now. Failure to do so risks leaking the occ env used to set the binders OccInfo. For T26425 compiler residency went down by a factor of ~10x. Compile time also improved by a factor of ~1.6. ------------------------- Metric Decrease: T18698a T26425 T9233 ------------------------- - - - - - 5618645b by Vladislav Zavialov at 2025-10-30T12:39:33-04:00 Fix namespace specifiers in subordinate exports (#12488) This patch fixes an oversight in the `lookupChildrenExport` function that caused explicit namespace specifiers of subordinate export items to be ignored: module M (T (type A)) where -- should be rejected data T = A Based on the `IEWrappedName` data type, there are 5 cases to consider: 1. Unadorned name: P(X) 2. Named default: P(default X) 3. Pattern synonym: P(pattern X) 4. Type name: P(type X) 5. Data name: P(data X) Case 1 is already handled correctly; cases 2 and 3 are parse errors; and it is cases 4 and 5 that we are concerned with in this patch. Following the precedent established in `LookupExactName`, we introduce a boolean flag in `LookupChildren` to control whether to look up in all namespaces or in a specific one. If an export item is accompanied by an explicit namespace specifier `type` or `data`, we restrict the lookup in `lookupGRE` to a specific namespace. The newly introduced diagnostic `TcRnExportedSubordinateNotFound` provides error messages and suggestions more tailored to this context than the previously used `reportUnboundName`. - - - - - f75ab223 by Peter Trommler at 2025-10-31T18:43:13-04:00 ghc-toolchain: detect PowerPC 64 bit ABI Check preprocessor macro defined for ABI v2 and assume v1 otherwise. Fixes #26521 - - - - - d086c474 by Peter Trommler at 2025-10-31T18:43:13-04:00 ghc-toolchain: refactor, move lastLine to Utils - - - - - 995dfe0d by Vladislav Zavialov at 2025-10-31T18:43:54-04:00 Tests for -Wduplicate-exports, -Wdodgy-exports Add test cases for the previously untested diagnostics: [GHC-51876] TcRnDupeModuleExport [GHC-64649] TcRnNullExportedModule This also revealed a typo (incorrect capitalization of "module") in the warning text for TcRnDupeModuleExport, which is now fixed. - - - - - f6961b02 by Cheng Shao at 2025-11-01T00:08:01+01:00 wasm: reformat dyld source code This commit reformats dyld source code with prettier, to avoid introducing unnecessary diffs in subsequent patches when they're formatted before committing. - - - - - 0c9032a0 by Cheng Shao at 2025-11-01T00:08:01+01:00 wasm: simplify _initialize logic in dyld This commit simplifies how we _initialize a wasm shared library in dyld and removes special treatment for libc.so, see added comment for detailed explanation. - - - - - ec1b40bd by Cheng Shao at 2025-11-01T00:08:01+01:00 wasm: support running dyld fully client side in the browser This commit refactors the wasm dyld script so that it can be used to load and run wasm shared libraries fully client-side in the browser without needing a wasm32-wasi-ghci backend: - A new `DyLDBrowserHost` class is exported, which runs in the browser and uses the in-memory vfs without any RPC calls. This meant to be used to create a `rpc` object for the fully client side use cases. - The exported `main` function now can be used to load user-specified shared libraries, and the user can use the returned `DyLD` instance to run their own exported Haskell functions. - The in-browser wasi implementation is switched to https://github.com/haskell-wasm/browser_wasi_shim for bugfixes and major performance improvements not landed upstream yet. - When being run by deno, it now correctly switches to non-nodejs code paths, so it's more convenient to test dyld logic with deno. See added comments for details, as well as the added `playground001` test case for an example of using it to build an in-browser Haskell playground. - - - - - 8f3e481f by Cheng Shao at 2025-11-01T00:08:01+01:00 testsuite: add playground001 to test haskell playground This commit adds the playground001 test case to test the haskell playground in browser, see comments for details. - - - - - af40606a by Cheng Shao at 2025-11-01T00:08:04+01:00 Revert "testsuite: add T26431 test case" This reverts commit 695036686f8c6d78611edf3ed627608d94def6b7. T26431 is now retired, wasm ghc internal-interpreter logic is tested by playground001. - - - - - 86c82745 by Vladislav Zavialov at 2025-11-01T07:24:29-04:00 Supplant TcRnExportHiddenComponents with TcRnDodgyExports (#26534) Remove a bogus special case in lookup_ie_kids_all, making TcRnExportHiddenComponents obsolete. - - - - - fcf6331e by Richard Eisenberg at 2025-11-03T08:33:05+00:00 Refactor fundep solving This commit is a large-scale refactor of the increasingly-messy code that handles functional dependencies. It has virtually no effect on what compiles but improves error messages a bit. And it does the groundwork for #23162. The big picture is described in Note [Overview of functional dependencies in type inference] in GHC.Tc.Solver.FunDeps * New module GHC.Tc.Solver.FunDeps contains all the fundep-handling code for the constraint solver. * Fundep-equalities are solved in a nested scope; they may generate unifications but otherwise have no other effect. See GHC.Tc.Solver.FunDeps.solveFunDeps The nested needs to start from the Givens in the inert set, but not the Wanteds; hence a new function `resetInertCans`, used in `nestFunDepsTcS`. * That in turn means that fundep equalities never show up in error messages, so the complicated FunDepOrigin tracking can all disappear. * We need to be careful about tracking unifications, so we kick out constraints from the inert set after doing unifications. Unification tracking has been majorly reformed: see Note [WhatUnifications] in GHC.Tc.Utils.Unify. A good consequence is that the hard-to-grok `resetUnificationFlag` has been replaced with a simpler use of `reportCoarseGrainUnifications` Smaller things: * Rename `FunDepEqn` to `FunDepEqns` since it contains multiple type equalities. Some compile time improvement Metrics: compile_time/bytes allocated Baseline Test value New value Change ---------------------- -------------------------------------- T5030(normal) 173,839,232 148,115,248 -14.8% GOOD hard_hole_fits(normal) 286,768,048 284,015,416 -1.0% geo. mean -0.2% minimum -14.8% maximum +0.3% Metric Decrease: T5030 - - - - - 231adc30 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 QuickLook's tcInstFun should make instantiation variables directly tcInstFun must make "instantiation variables", not regular unification variables, when instantiating function types. That was previously implemented by a hack: set the /ambient/ level to QLInstTyVar. But the hack finally bit me, when I was refactoring WhatUnifications. And it was always wrong: see the now-expunged (TCAPP2) note. This commit does it right, by making tcInstFun call its own instantiation functions. That entails a small bit of duplication, but the result is much, much cleaner. - - - - - 39d4a24b by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Build implication for constraints from (static e) This commit addresses #26466, by buiding an implication for the constraints arising from a (static e) form. The implication has a special ic_info field of StaticFormSkol, which tells the constraint solver to use an empty set of Givens. See (SF3) in Note [Grand plan for static forms] in GHC.Iface.Tidy.StaticPtrTable This commit also reinstates an `assert` in GHC.Tc.Solver.Equality. The test `StaticPtrTypeFamily` was failing with an assertion failure, but it now works. - - - - - 2e2aec1e by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Comments about defaulting representation equalities - - - - - 52a4d1da by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Improve tracking of rewriter-sets This refactor substantially improves the treatment of so-called "rewriter-sets" in the constraint solver. The story is described in the rewritten Note [Wanteds rewrite Wanteds: rewriter-sets] in GHC.Tc.Types.Constraint Some highlights * Trace the free coercion holes of a filled CoercionHole, in CoercionPlusHoles. See Note [Coercion holes] (COH5) This avoids taking having to take the free coercion variables of a coercion when zonking a rewrriter-set * Many knock on changes * Make fillCoercionHole take CoercionPlusHoles as its argument rather than to separate arguments. * Similarly setEqIfWanted, setWantedE, wrapUnifierAndEmit. * Be more careful about passing the correct CoHoleSet to `rewriteEqEvidence` and friends * Make kickOurAfterFillingCoercionHole more clever. See new Note [Kick out after filling a coercion hole] Smaller matters * Rename RewriterSet to CoHoleSet * Add special-case helper `rewriteEqEvidenceSwapOnly` - - - - - 3e78e1ba by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Tidy up constraint solving for foralls * In `can_eq_nc_forall` make sure to track Givens that are used in the nested solve step. * Tiny missing-swap bug-fix in `lookup_eq_in_qcis` * Fix some leftover mess from commit 14123ee646f2b9738a917b7cec30f9d3941c13de Author: Simon Peyton Jones Date: Wed Aug 20 00:35:48 2025 +0100 Solve forall-constraints via an implication, again Specifically, trySolveImplication is now dead. - - - - - 973f2c25 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Do not treat CoercionHoles as free variables in coercions This fixes a long-standing wart in the free-variable finder; now CoercionHoles are no longer treated as a "free variable" of a coercion. I got big and unexpected performance regressions when making this change. Turned out that CallArity didn't discover that the free variable finder could be eta-expanded, which gave very poor code. So I re-used Note [The one-shot state monad trick] for Endo, resulting in GHC.Utils.EndoOS. Very simple, big win. - - - - - c2b8a0f9 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Update debug-tracing in CallArity No effect on behaviour, and commented out anyway - - - - - 9aa5ee99 by Simon Peyton Jones at 2025-11-03T08:33:28+00:00 Comments only -- remove dangling Note references - - - - - 6683f183 by Simon Peyton Jones at 2025-11-03T08:33:28+00:00 Accept error message wibbles - - - - - 3ba3d9f9 by Luite Stegeman at 2025-11-04T00:59:41-05:00 rts: fix eager black holes: record mutated closure and fix assertion This fixes two problems with handling eager black holes, introduced by a1de535f762bc23d4cf23a5b1853591dda12cdc9. - the closure mutation must be recorded even for eager black holes, since the mutator has mutated it before calling threadPaused - The assertion that an unmarked eager black hole must be owned by the TSO calling threadPaused is incorrect, since multiple threads can race to claim the black hole. fixes #26495 - - - - - e2de3220 by Rodrigo Mesquita at 2025-11-04T14:05:15+00:00 build: Relax ghc/ghc-boot Cabal bound to 3.16 Fixes #26202 - - - - - b473a9e3 by Rodrigo Mesquita at 2025-11-04T14:05:15+00:00 cabal-reinstall: Use haddock-api +in-tree-ghc Fixes #26202 - - - - - 12e1f76d by Rodrigo Mesquita at 2025-11-04T14:05:15+00:00 cabal-reinstall: Pass --strict to Happy This is necessary to make the generated Parser build successfully This mimics Hadrian, which always passes --strict to happy. Fixes #26202 - - - - - 3694ba79 by Rodrigo Mesquita at 2025-11-04T14:05:15+00:00 genprimopcode: Require higher happy version I've bumped the happy version to forbid deprecated Happy versions which don't successfully compile. - - - - - 6a683716 by Rodrigo Mesquita at 2025-11-04T14:05:15+00:00 Bump CI index-state Necessary to fix cabal.project-reinstall - - - - - 521 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitmodules - cabal.project-reinstall - compiler/GHC.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/Breakpoints.hs - + compiler/GHC/ByteCode/Serialize.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/CLabel.hs - compiler/GHC/Cmm/Info.hs - compiler/GHC/Cmm/Info/Build.hs - compiler/GHC/Cmm/MachOp.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/Cmm/Pipeline.hs - compiler/GHC/Cmm/UniqueRenamer.hs - compiler/GHC/CmmToAsm/AArch64/CodeGen.hs - compiler/GHC/CmmToAsm/Config.hs - compiler/GHC/CmmToAsm/Wasm/FromCmm.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/CmmToC.hs - compiler/GHC/CmmToLlvm/Base.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/Core/ConLike.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/CallArity.hs - compiler/GHC/Core/Opt/Monad.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/Pipeline.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/Simplify/Monad.hs - compiler/GHC/Core/Opt/Simplify/Utils.hs - compiler/GHC/Core/PatSyn.hs - compiler/GHC/Core/TyCo/Compare.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Ppr.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Data/FlatBag.hs - compiler/GHC/Data/SmallArray.hs - compiler/GHC/Data/Word64Map/Internal.hs - compiler/GHC/Data/Word64Map/Lazy.hs - compiler/GHC/Driver/Backend.hs - compiler/GHC/Driver/Backpack.hs - + compiler/GHC/Driver/ByteCode.hs - compiler/GHC/Driver/CodeOutput.hs - compiler/GHC/Driver/Config/CmmToAsm.hs - compiler/GHC/Driver/Config/Finder.hs - compiler/GHC/Driver/Config/Stg/Debug.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Errors.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/MakeFile.hs - compiler/GHC/Driver/Messager.hs - compiler/GHC/Driver/Monad.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore/Breakpoints.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Foreign/JavaScript.hs - compiler/GHC/HsToCore/Foreign/Wasm.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Pmc/Utils.hs - compiler/GHC/HsToCore/Quote.hs - 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compiler/GHC/Stg/Debug.hs - + compiler/GHC/Stg/Debug/Types.hs - compiler/GHC/Stg/EnforceEpt.hs - compiler/GHC/Stg/Pipeline.hs - compiler/GHC/StgToCmm/ExtCode.hs - compiler/GHC/StgToCmm/Monad.hs - compiler/GHC/StgToCmm/Prim.hs - compiler/GHC/StgToJS/CodeGen.hs - compiler/GHC/StgToJS/Ids.hs - compiler/GHC/StgToJS/Linker/Linker.hs - compiler/GHC/StgToJS/Prim.hs - compiler/GHC/Tc/Deriv/Generate.hs - compiler/GHC/Tc/Deriv/Generics.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Gen/Splice.hs - compiler/GHC/Tc/Instance/Class.hs - compiler/GHC/Tc/Instance/FunDeps.hs - compiler/GHC/Tc/Module.hs - compiler/GHC/Tc/Solver.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - + compiler/GHC/Tc/Solver/FunDeps.hs - 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libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs - libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs - + libraries/ghc-internal/tests/backtraces/T26507.hs - + libraries/ghc-internal/tests/backtraces/T26507.stderr - libraries/ghc-internal/tests/backtraces/all.T - libraries/ghc-internal/tests/stack-annotation/all.T - libraries/ghc-prim/changelog.md - + libraries/template-haskell-lift - + libraries/template-haskell-quasiquoter - m4/fp_check_pthreads.m4 - m4/fptools_alex.m4 - m4/fptools_happy.m4 - rts/BuiltinClosures.c - rts/CloneStack.h - rts/Compact.cmm - rts/ContinuationOps.cmm - rts/Exception.cmm - rts/Prelude.h - rts/PrimOps.cmm - rts/Printer.c - rts/RtsAPI.c - rts/RtsStartup.c - rts/RtsSymbols.c - + rts/RtsToHsIface.c - rts/StgStdThunks.cmm - rts/ThreadPaused.c - rts/configure.ac - − rts/external-symbols.list.in - rts/include/Rts.h - rts/include/RtsAPI.h - rts/include/Stg.h - + rts/include/rts/RtsToHsIface.h - rts/include/rts/Types.h - rts/include/rts/storage/Block.h - rts/include/stg/Prim.h - rts/posix/OSMem.c - rts/posix/Signals.c - libraries/ghc-internal/cbits/atomic.c → rts/prim/atomic.c - libraries/ghc-internal/cbits/bitrev.c → rts/prim/bitrev.c - libraries/ghc-internal/cbits/bswap.c → rts/prim/bswap.c - libraries/ghc-internal/cbits/clz.c → rts/prim/clz.c - libraries/ghc-internal/cbits/ctz.c → rts/prim/ctz.c - libraries/ghc-internal/cbits/int64x2minmax.c → rts/prim/int64x2minmax.c - libraries/ghc-internal/cbits/longlong.c → rts/prim/longlong.c - libraries/ghc-internal/cbits/mulIntMayOflo.c → rts/prim/mulIntMayOflo.c - libraries/ghc-internal/cbits/pdep.c → rts/prim/pdep.c - libraries/ghc-internal/cbits/pext.c → rts/prim/pext.c - libraries/ghc-internal/cbits/popcnt.c → rts/prim/popcnt.c - libraries/ghc-internal/cbits/vectorQuotRem.c → rts/prim/vectorQuotRem.c - libraries/ghc-internal/cbits/word2float.c → rts/prim/word2float.c - rts/rts.buildinfo.in - rts/rts.cabal - rts/sm/NonMoving.c - rts/sm/NonMovingMark.c - rts/sm/Scav.c - rts/wasm/JSFFI.c - rts/wasm/scheduler.cmm - rts/win32/libHSghc-internal.def - 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testsuite/tests/typecheck/should_fail/T9612.stderr - testsuite/tests/typecheck/should_fail/TcStaticPointersFail03.stderr - testsuite/tests/typecheck/should_fail/VisFlag1.stderr - testsuite/tests/typecheck/should_fail/all.T - testsuite/tests/typecheck/should_fail/tcfail122.stderr - testsuite/tests/typecheck/should_fail/tcfail143.stderr - + testsuite/tests/warnings/should_compile/DodgyExports02.hs - + testsuite/tests/warnings/should_compile/DodgyExports02.stderr - + testsuite/tests/warnings/should_compile/DodgyExports03.hs - + testsuite/tests/warnings/should_compile/DodgyExports03.stderr - + testsuite/tests/warnings/should_compile/DuplicateModExport.hs - + testsuite/tests/warnings/should_compile/DuplicateModExport.stderr - + testsuite/tests/warnings/should_compile/EmptyModExport.hs - + testsuite/tests/warnings/should_compile/EmptyModExport.stderr - testsuite/tests/warnings/should_compile/all.T - utils/check-exact/ExactPrint.hs - utils/check-exact/Parsers.hs - utils/check-exact/Preprocess.hs - utils/deriveConstants/Main.hs - utils/genprimopcode/genprimopcode.cabal - utils/ghc-toolchain/ghc-toolchain.cabal - utils/ghc-toolchain/src/GHC/Toolchain/CheckArm.hs - + utils/ghc-toolchain/src/GHC/Toolchain/CheckPower.hs - utils/ghc-toolchain/src/GHC/Toolchain/ParseTriple.hs - utils/ghc-toolchain/src/GHC/Toolchain/Tools/MergeObjs.hs - utils/ghc-toolchain/src/GHC/Toolchain/Utils.hs - utils/haddock/cabal.project - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - utils/jsffi/dyld.mjs The diff was not included because it is too large. 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