[Git][ghc/ghc][wip/ani/T27156] 57 commits: EPA: Remove LocatedP from OverlapMode

Apoorv Ingle pushed to branch wip/ani/T27156 at Glasgow Haskell Compiler / GHC Commits: 85b10c00 by Alan Zimmerman at 2026-07-31T22:09:47+01:00 EPA: Remove LocatedP from OverlapMode We have type LocatedP = GenLocated SrcSpanAnnP type SrcSpanAnnP = EpAnn AnnPragma As the first step in removing this in favour of LocatedA which only captures location, comments and trailing annotations, we remove it from OverlapMode We do this by moving the AnnPragma into the TTG extension point instead. - - - - - c9a34a00 by Viktor Dukhovni at 2026-08-02T04:34:17-04:00 Fix note typo - - - - - 4f2a21f7 by Andreas Klebinger at 2026-08-02T22:46:46-04:00 Apply oneShot Monad trick to STG LintM - - - - - 21e4b89d by Andreas Klebinger at 2026-08-02T22:46:46-04:00 stgLint: Use a single reader env for read only arguments. - - - - - d415f38a by Alan Zimmerman at 2026-08-02T22:47:27-04:00 EPA: Remove LocatedP from CType The next step of removing use of LocatedP by moving the AnnPragma for CType into its TTG extension point instead. - - - - - 8fc6f882 by Simon Jakobi at 2026-08-05T14:53:41-04:00 testsuite: Don't crash on non-UTF-8 test output read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded strictly (the first three with UTF-8, read_diff with the locale encoding), so a test emitting invalid UTF-8 (binary output, or a crash truncating a multi-byte character) raised UnicodeDecodeError and was reported as a framework failure instead of its actual result. Decode with errors='replace', like read_no_crs and safe_print. Assisted-by: Claude Fable 5 - - - - - 56534866 by Simon Jakobi at 2026-08-05T14:53:41-04:00 testsuite: Colorize the test summary, also in CI The summary headings were plain, and SUMMARY was colored unconditionally, so the escapes also ended up in the file written by --summary-file. Color is now decided per output sink via term_color.colored_if; see the comments in term_color. CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so add --force-colors and pass it in .gitlab/ci.sh. Assisted-by: Claude Opus 5 - - - - - bceb541a by Simon Jakobi at 2026-08-05T14:53:42-04:00 testsuite: Repeat unexpected failure output in the summary Finding out why a test failed meant scrolling back through a possibly very long log to the point where the test ran. The summary now repeats the captured output of unexpected failures, before the statistics, so the most interesting part is at the end of the log (#16720). Output mismatches report their diff instead of the mismatching stream (see Note [Redundant output in test results]). The repeated output is bounded per stream, and skipped altogether beyond MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in several ways share one block. Test results now report a source-relative directory, stable regardless of where the run was started from. Assisted-by: Claude Fable 5 - - - - - 2ab02c57 by Ben Gamari at 2026-08-05T14:54:24-04:00 base: Don't drop exception context in SomeException(toException) For reasons that are lost to time, the implementation of [CLC #200] that was merged inappropriately dropped `ExceptionContext` in the `toException` implementation given to `SomeException`. Fix this infelicity. [CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200 - - - - - 126ce574 by Vladislav Zavialov at 2026-08-05T14:55:05-04:00 Test case for #20902 Starting with GHC 9.14.1 (the first major release to include 51e3ec83), and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68 and b30f25591e), all examples in this ticket are handled as expected. - - - - - b14d8d59 by Alan Zimmerman at 2026-08-05T14:55:46-04:00 EPA: Remove LocatedP, last use in WarningTxt The last step of removing LocatedP, by moving the AnnPragma for WarningTxt into its TTG extension point instead. This also allows us to remove LocatedP and SrcSpanAnnP - - - - - 70b58c8f by Vladislav Zavialov at 2026-08-05T14:56:27-04:00 Test cases for #18725 Starting with GHC 9.4 (the first release to include 268efcc9a4), the program in this ticket no longer panics. A standalone kind signature breaks the recursive loop, so the type constructor can be used in a kind within its own group. T18725a checks that this is accepted with the signature present, while T18725b confirms it is still rejected without it. - - - - - b18c8dd5 by Zubin Duggal at 2026-08-06T15:51:01-04:00 hie files: Dump the type table when dumping with -ddump-hie - - - - - f839d0fb by Zubin Duggal at 2026-08-06T15:51:01-04:00 hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast Fixes #25709 - - - - - 5753ebaa by Simon Jakobi at 2026-08-06T15:51:43-04:00 testsuite: fix stale paths for the ghc-config build artifacts ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in 6c7a49139c, but the .gitignore entry and the clean rule still referred to the old location. As a result the compiled ghc-config binary, which boilerplate.mk rebuilds on every make-driven test run, showed up as an untracked file and was never cleaned. Assisted-by: Claude Opus 5 - - - - - 246d4d72 by Simon Peyton Jones at 2026-08-06T15:52:25-04:00 Documentation only ...driven by my investigation of #27591 - - - - - be69e9df by Alan Zimmerman at 2026-08-06T15:53:05-04:00 EPA: Replace AnnPragma with individual types We introduced AnnPragma as a common type for all pragma usages wrapped in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma moved into the TTG points for the given items, we can ensure that each carries only the annotations it needs. So we remove AnnPragma, and in its place bring in AnnCType AnnWarningTxt AnnOverlap AnnAnnDecl AnnPragSCC - - - - - 0779e12c by Simon Jakobi at 2026-08-07T12:36:11-04:00 Cmm: print unreachable blocks under -dppr-debug (#27368) Unreachable blocks linger in a CmmGraph's block map for most of the Cmm pipeline, but pprCmmGraph only ever printed the blocks reachable from the entry, so dumps looked consistent while the graph was not. Issues like #27368 were hard to debug due to this. pprCmmGraph now appends the stored-but-unreachable blocks under a "// unreachable blocks:" heading when -dppr-debug is on. See Note [unreachable blocks] in GHC.Cmm.Pipeline. Assisted-by: Claude Opus 5 - - - - - 3a0f9a51 by Simon Peyton Jones at 2026-08-07T12:36:54-04:00 Fix three bugs related to required type args and INLINE pragmas * `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front, leading to a Lint error (#27557) * The arity in an InlineSaturation is the VisArity not the Arity; the two can differ when we have "required" type arguments. This made the INLINE pragma argument counting go wrong in `makeCorePair` (#27590). * When a simple binding has a type signature, we take special path in `tcPolyCheck`, leading to an outer `AbsBinds` that has no dictionaries, even when the binding is in fact overloaded. That confused the inline-arity computation in `makeCorePair` (#27589). The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`. That actually simplifies the API of `makeCorePair`, which is nice. The first bug is fixed by swapping the visiblity flags in `GHC.Core.Opt.Arity.mkEtaForAllMCo` Getting the INLINE behaviour right led to some perf changes: * Runtime /halved/ on T7954 due to better specialisation * Compile time increased by 6% in T21839c because a bit more inlining happened, as it always should have done. * For some reason compile-time max-bytes-used dropped by 30% on T27336, but only on one build configuration; and it increased on LinkableUsage02 by 6% on another configuration Geometric mean effect on our compile time benchmarks is +0.1%. Metric Decrease: T27336 T7954 Metric Increase: LinkableUsage02 T21839c - - - - - 4f985108 by Vladislav Zavialov at 2026-08-07T17:49:50-04:00 Discard type arguments in tcPatToExpr (#27440, #27583) The builder expression of an implicitly bidirectional pattern synonym must not mention types written in the RHS: * Invisible type arguments led to a panic (#27440) * Required type arguments failed with out-of-scope variables (#27583) Both are now discarded, following the precedent established by pattern signatures (#9867). Discarding type arguments takes some care: a type pattern cannot be told from a value pattern by syntax alone, as the `type` keyword may be omitted. Consider: data T a b c where MkT :: forall a. forall b c -> a -> T a b c pattern P :: x -> T x y z pattern P x = MkT @a (type b) c x In P's right-hand side, `@a` and `type b` are clearly type arguments, but what about `c` and `x`? We can only tell by matching the patterns against MkT's type. So tcPatToExpr now runs in TcM and matches the arguments against the constructor's TyVarBinders using zipPatsBndrs, which is made public for this purpose. The resulting builder is $bP x = MkT _ _ x. See Note [Discarding types in the builder expression]. Test cases: T27440a T27440b T27440c T27440d T27440e T27583a T27583b T27583c T27583d T27583e T27583f T27583g Metric Increase: LinkableUsage02 Metric Decrease: T27336 Assisted-by: Claude Opus 5 - - - - - eb1dcd4d by sheaf at 2026-08-07T17:50:40-04:00 mkWpFun_FRR: fix ordering of coercion composition When the subsumption machinery generates an eta-expansion, we must perform a representation polymorphism check to ensure the lambda binder it introduces has a fixed runtime representation. This is done in GHC.Tc.Utils.mkWpFun_FRR. This check involves composing quite a few coercions, arising from representation-polymorphism checks on both the actual and expected argument types. These coercions are then chained using HsWrapper composition, <.>. The ordering of composition was incorrect, leading to the Core Lint failure reported in #27639. This commit fixes that. Fixes #27639 - - - - - 3a552476 by Simon Jakobi at 2026-08-09T15:20:06-04:00 Word64Map: add compareSize compareSize m c compares the size of a map to an Int, but unlike compare (size m) c it stops traversing the map once the outcome is determined. Based on https://github.com/haskell/containers/pull/1139 Assisted-by: Claude Opus 5 - - - - - 6e2c99d8 by Simon Jakobi at 2026-08-09T15:20:06-04:00 Use a pigeonhole sort for deterministic UniqDFM iteration Deterministic UniqDFM iteration used a list mergesort, allocating O(n log n) cons cells and contributing significantly to compiler allocations (#27459). Use a pigeonhole sort where appropriate, while retaining the mergesort fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic iteration]. The peak_megabytes_allocated increase for LinkableUsage02 is probably due to GC timing noise. See #27613. ------------------------- Metric Decrease: InstanceMatching InstanceMatching1 ManyAlternatives T12707 T13379 T13719 T24471 T27336 T5321FD T5321Fun T783 Metric Increase 'peak_megabytes_allocated': LinkableUsage02 ------------------------- Assisted-by: gpt-5.6-sol via Codex CLI - - - - - a938ab12 by sheaf at 2026-08-09T15:20:48-04:00 Testsuite: don't measure max residency for T27336 We really care more about total allocations for this test, so this commit removes the maximum residency measurement. - - - - - 7d94bb78 by Alan Zimmerman at 2026-08-09T15:21:29-04:00 EPA: Remove LocatedE, replace with LocatedA This gets rid of one more LocatedXXX occurrence - - - - - 9df24b7e by sheaf at 2026-08-10T14:28:30-04:00 hie.yaml: use a polyglot shell/batch script This commit merges hie-bios and hie-bios.bat into a single polyglot script. This avoids Windows users having to manually update hie.yaml in order to be able to use HLS. - - - - - 7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00 EPA: Remove type parameter from AnnList This is a step towards cutting AnnList down to its core for formatting lists only - - - - - e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00 driver: Link object files in a deterministic order The object files handed to the linker come from the HomePackageTable, which is ordered by the order in which modules finished compiling. With -j1 that is the build plan order, with -jN it is whatever the scheduler produced, so the same sources can link to different (but equivalent) binaries. The order reaches the output: .text and .rodata contributions are concatenated in link order, so e.g. building the hdav executable of the DAV package twice, once with -j1 and once with -j4, yields two binaries that differ in ~100kB of section contents. Sort the home modules by module before collecting their linkables, guarded under `Opt_ObjectDeterminism` . Fixes #27612 Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de> - - - - - 556db2f3 by sheaf at 2026-08-10T21:32:06-04:00 Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite As remarked in #27628, this module currently sits on a knife's edge: if the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then SpecConstr suddenly kicks in and causes disastrous reboxing of the LiftingContext argument. To make this less likely to happen, this commit lowers the SpecConstr threshold. - - - - - c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00 Major patch to re-engineer known-key names This big patch implements the New Plan for known-key names, described in #27013. Read the big Note [Overview of known-key names] in GHC.Types.Name Some things had to be reworked slightly to accomodate the new known-keys design. A significant one was the generation of auxiliary KindRep bindings, which was greatly simplified. Note [Grand plan for Typeable] was updated accordingly. Another example: GHC.Internal.CString was merged into GHC.Internal.Types. Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com> The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed Metrics: compile_time/bytes allocated ------------------------------------- Baseline Test Metric value New value Change ------------------------------------------------------------------------------------------ MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD geo. mean +0.1% minimum -8.0% maximum +5.4% All performance regressions were investigated in depth. The surviving ones: - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 - T13820, T18140, T10547, T13035 regress because we load an additional interface and associated Names for GHC.Essentials. ------------------------- Metric Decrease: MultiLayerModules T13379 T13701 T14697 T26989 T4801 T783 T9961 hard_hole_fits mhu-perf size_hello_artifact size_hello_obj size_hello_unicode Metric Increase: LinkableUsage01 LinkableUsage02 MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 T10547 T13035 T13820 T18140 T18698a T18698b T20049 ------------------------- Bumps submodule binary Closes #27013 - - - - - 61665e79 by sheaf at 2026-08-14T01:09:33+02:00 Allow GHC.Essentials to be hidden This commit overhauls several aspects of the known entity handling, in order to allow GHC.Essentials to be hidden without a proliferation of special cases in the compiler. The main contribution is to introduce the 'UnresolvedImport' datatype which cleans up a lot of ad-hoc handling relating to 'ModSummary', fixing #27603. This allows us to reduce duplication, e.g. by having Backpack reuse 'mkUnresolvedImports' instead of replicating the "add implicit imports" logic. It also makes it easier to avoid undesirable edge cases (such as making sure that the Template Haskell 'reifyModule' function does not leak the implicit GHC.Essentials import). In particular, the infamous 'findImportedModuleWithIsBoot' is now simply 'resolveImport', taking a single 'UnresolvedImport' and resolving it to a 'FindResult' (usually a 'Module'). Other changes: - Cache the result of looking up GHC.Essentials (in TcM and DsM environments) to avoid redundant work. This reduces allocations on LinkableUsage01 and hard_hole_fits. - Properly look up known entities for StaticPointers like we do for other known entities everywhere else. This allows e.g. modules in ghc-internal to use -XStaticPointers. - When using multiple home units, we are now careful to handle the situation in which we may have multiple GHC.Essentials modules around. See the new tests under 'driver/multipleHomeUnits'. - - - - - b19fcc1c by Vladislav Zavialov at 2026-08-14T06:26:11-04:00 Increase test coverage of diagnostics, batch 2 Add test cases for the previously untested diagnostics: [GHC-26133] TcRnForeignImportPrimSafeAnn [GHC-68444] SumAltArityExceeded [GHC-63966] IllegalSumAlt [GHC-23882] IllegalDeclaration [GHC-60220] InvalidCCallImpent [GHC-18816] RecGadtNoCons [GHC-38140] GadtNoCons [GHC-37056] InvalidTypeInstanceHeader [GHC-78486] InvalidTyFamInstLHS [GHC-39639] DefaultDataInstDecl [GHC-78822] AssocDefaultNotAssoc [GHC-43510] NotSimpleUnliftedType [GHC-41843] IOResultExpected [GHC-07641] AtLeastOneArgExpected [GHC-52886] InvalidTopDecl Remove unused error constructors: [GHC-92057] ImportLookupAmbiguous - - - - - 7b27f25a by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Drop peak_megabytes_allocated from LinkableUsage tests LinkableUsage01/02 collected all metrics with a 2% tolerance. For peak_megabytes_allocated, whose granularity is 1 MB, that window is under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the test (#27613, #27489). Drop that metric: max_bytes_used guards the Linkable-retention property with byte granularity, at a tolerance that still comfortably exceeds the noise observed in CI. Assisted-by: Claude Fable 5 - - - - - e5de423b by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Don't truncate fractional baselines when computing bounds RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with int() before applying the tolerance. Baselines can be fractional (they are averaged over several measurements), so this skewed the acceptance window downwards: in #27613, a baseline of 33.67 at 2% tolerance yielded bounds (32, 34) instead of (32, 35), rejecting a measurement that was within tolerance. Assisted-by: Claude Fable 5 - - - - - db959f83 by Simon Jakobi at 2026-08-14T15:16:44-04:00 testsuite: Expect length001 failure in nonmoving_thr_sanity length001 relies on an optimization rule to avoid excessive stack use. The nonmoving_thr_sanity way does not enable optimization, so classify its stack overflow as an expected failure, as is already done for the other unoptimized nonmoving ways. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 4f2b7d90 by Simon Jakobi at 2026-08-14T15:16:44-04:00 testsuite: Omit T22859 in nonmoving threaded ways T22859 checks allocation-limit handlers with output that depends on precise allocation behaviour. The nonmoving threaded ways change where these limits are reached, just as the already-omitted LLVM ways do. Omit these ways instead of treating their incidental output differences as test failures. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - c4abddcb by Simon Jakobi at 2026-08-14T15:16:44-04:00 rts/js: Implement eq_thread, and test Eq/Ord ThreadId (#16761) Since d1f3c63701, Eq ThreadId is implemented via the RTS function eq_thread, but the JS RTS never provided it, so comparing ThreadIds for equality on the JS backend crashed with ReferenceError: h$eq_thread is not defined Like the C implementation, h$eq_thread uses pointer equality: The JS RTS has exactly one thread object per thread. Since previously no test exercised eq_thread directly, this commit adds a test covering equality, its stability across GC, and agreement with Ord. Assisted-by: Claude Fable 5 - - - - - 4a7defa1 by Simon Jakobi at 2026-08-14T15:16:44-04:00 testsuite: Make listThreads1 insensitive to the RTS's own threads listThreads1 expected `listThreads` to return exactly [ThreadId 1]. That holds only under a non-threaded RTS. Under a threaded RTS however there are more threads present, so we change the test to simply check that `myThreadId` is present in the list. Assisted-by: Claude Opus 5 - - - - - b757727a by Vladislav Zavialov at 2026-08-14T15:17:27-04:00 Fix tcLookupId panic with RequiredTypeArguments and PatternSynonyms (#27586) The arguments declared on the left-hand side of a pattern synonym are looked up as term variables bound by its right-hand side. Prior to this patch, that lookup panicked with RequiredTypeArguments: data T a where MkT :: forall a -> T a pattern P :: Int -> T Int pattern P x = MkT x On the RHS, `x` looks like a term argument, so the renamer binds it in the term namespace. Only during type checking does it turn out to be a type variable, so the lookup on the LHS finds an ATyVar rather than an ATcId. As the lookup was done with tcLookupId, it resulted in a panic. Now the arguments are looked up with tcLookupPatSynArg, which reports an illegal term-level use of `x`, just as an ordinary function definition `f (MkT x) = x` does. Test cases: T27586a T27586b T27586c Assisted-by: Claude Opus 5 - - - - - c130188d by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 loopImports: Don't dup ms_uid in summary imports We were writing the ms_unitid of the mod summary with every single import of that module That complicated the code (as though the UnitId in that list could ever be something else) and also allocates unnecessarily per every mod import. Very slight allocation decrease measured locally in a few tests: (MultiComponentModulesRecomp: -0.06%; MultiComponentModulesRecomp100: -0.05%) Purely a clean up. - - - - - c71166a8 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 downsweep: make control flow simpler and cache correct This refactor extracts the control flow of downsweep into a single function `dfsBuild`, which takes care of iteratively expanding and traversing all nodes of the in-construction module graph necessary to build a full `ModuleGraph`. There are three levels of caching going on, all of which are necessary to make sure we don't do repeated work (notably, NEVER summarise the same module twice). 1. `dfsBuild` accumulates the final module graph and never revisits the same node of the module graph. Cache is keyed by the final `ModuleGraph`s `NodeKey`s. 2. For Module A in home-unit u1, each import in the list of imports needs to be *found* (call to `findImportedModuleWithIsBoot`): at this point, we only have the `ModuleName` of the import, not the `Module`. This *finding* is somewhat expensive, so we cache it as well (`ImportsCache`). The cache key is the home-unit to which the module belongs~[1], the import package qualifier, and the ModuleName. [1] Different home-units will have different package flags, which means potentially different `Module` resolution for the same `ModuleName`. 3. The most expensive operation we want to avoid is summarising a `Module` into a `ModSummary`, which notably involves parsing the module header from scratch. The third cache, in essence, maps a `Module` to its `ModSummary` (named `ModSummaryCache`). This cache upholds the invariant: we NEVER summarise the same module twice. In practice, the cache key is the Module's UnitId and the Source path; the reason is we need to distinguish between `.hs` and `.hs-boot` files, as their summaries will differ. Note that (2) can't guarantee this alone: Two ModuleName imports in separate units can (and likely do) map to the same `Module`. Note that the previous implementation failed to achieve the no-duplicate-work summarisation invariant, and we ended up doing a quadratic amount of processing in scenarios like test `MultiComponentModules100`. See also Note [Downsweep Control Flow and Caching] Fixes #27461 Perf changes: MultiComponentModules(normal) ghc/alloc 2,097,389,264 1,992,186,736 -5.0% GOOD MultiComponentModules100(normal) ghc/alloc 24,310,173,770 21,293,867,360 -12.4% GOOD MultiComponentModulesRecomp(normal) ghc/alloc 602,761,394 498,543,984 -17.3% GOOD MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,968,240 8,895,404,864 -25.2% GOOD ------------------------- Metric Decrease: MultiComponentModules MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 ------------------------- - - - - - ebc4047b by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 implicitRequirementsShallow can never reach HoleUnit findImportedModule will never return `HoleUnit` for a `ModuleName` (a `HoleUnit` can only be found as a signature instantiation, never as a directly *imported* thing) Therefore, we can drop `[ModuleName]` returned by `implicitRequirementsShallow`, which makes many things dead code. Namely, the call to `implicitRequirementsShallow` from GHC.Driver.Downsweep which was a performance bottleneck (for doing lots of duplicate work in findImportedModule) is now entirely gone. Fixes #27053 In an MR with this patch and the downsweep refactor (previous commit), CI says: MultiComponentModules(normal) ghc/alloc 2,097,396,728 1,943,662,304 -7.3% GOOD MultiComponentModules100(normal) ghc/alloc 24,310,182,136 17,227,574,440 -29.1% GOOD MultiComponentModulesRecomp(normal) ghc/alloc 602,769,518 449,973,656 -25.3% GOOD MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,976,408 4,828,894,160 -59.4% GOOD ------------------------- Metric Decrease: MultiComponentModules MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 ------------------------- - - - - - 85a6ab01 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 downsweep: Cache negative results When traversing a module graph structure, a uniquely identified node should always expand to the same thing. I don't see how visiting the same node which failed to be expanded a first time would ever successfully expand the second time we try to expand it (eg. when coming from a different edge to it -- it is still the same node!). The node expansion is local, based just based on the node itself, not on the path to get there. Therefore, this patch removes the weird behavior and commentary of `dfsBuild` wrt to `Nothing` not being cached and being potentially expanded a second time around to something different, which was misleading and, ultimately, incorrect. Now, we have a `MGRes`, which is more explicit about a node being Skipped just being a node that is ignored whenever it is found (and that skip is cached) -- and we may want to do this due to failures or due to just trying nodes which might not work on purpose, like hs-boots. We uniformly cache positive and negative results and remove the assumption that there might be an ordering in which the same node visited at a later time might be expanded differently. This makes it possible to traverse the module nodes in parallel without a change in behavior, since there's no longer a hidden ordering requirement. - - - - - 56747c3f by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 Organize and clean-up GHC.Driver.Downsweep Simply some cosmetic changes, moving definitions around to structure the module better into its relevant sections (In go (ns ++ ss), it's not a problem to use ++ because it's a good producer and we won't have to append fully before processing the next item in go) - - - - - 12f64118 by Wolfgang Jeltsch at 2026-08-15T06:31:12-04:00 Add support for textual output of bytecode file content - - - - - a737df91 by Brandon Chinn at 2026-08-15T12:40:25-04:00 Add law in qualified strings doc - - - - - e3188581 by Zubin Duggal at 2026-08-15T12:41:06-04:00 DmdAnal: Fix maxDmdType We need to eta expand the smaller DmdType using defaultArgDmd, like in lubDmdType. Introduce zipDmdType as a common combinator to implement both maxDmdType and lubDmdType uniformly. fixes #27626 - - - - - ca9b0b22 by mangoiv at 2026-08-15T12:41:47-04:00 hadrian: set the executable bit for hie-bios.bat - - - - - 007e6f98 by Apoorv Ingle at 2026-08-15T19:38:43-05:00 Work on #27156 - Add `RebindableSyntaxTable` to store function/operator names while renaming in the XBlah fields - Expand the following expressions right before typechecking instead of in the renamer * OverloadedLabel * RecordDotSyntax: HsGetField and HsProjection * ExplicitList * RecordUpd * HsIf * HsDo (Vanilla cases) - - - - - 759907bd by Apoorv Ingle at 2026-08-15T19:44:37-05:00 update notes - - - - - 5d8a0d2f by Apoorv Ingle at 2026-08-15T23:15:55-05:00 rebase changes - - - - - c2cf70ec by Apoorv Ingle at 2026-08-15T23:30:27-05:00 revert th test - - - - - 1013 changed files: - .gitlab/ci.sh - + changelog.d/27626 - + changelog.d/T20363 - + changelog.d/T27156 - + changelog.d/T27368-ppr-unreachable-cmm-blocks.md - 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