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[Git][ghc/ghc][wip/sjakobi/T27653] 37 commits: testsuite: Don't crash on non-UTF-8 test output
by Simon Jakobi (＠sjakobi) 14 Aug '26

14 Aug '26

Simon Jakobi pushed to branch wip/sjakobi/T27653 at Glasgow Haskell Compiler / GHC Commits: 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(a)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(a)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(a)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 - - - - - af8c9695 by Simon Jakobi at 2026-08-14T12:54:21+02:00 testsuite: Migrate perf tests off collect_compiler_stats('all') The 'all' metric argument applies a single tolerance to bytes allocated, max_bytes_used and peak_megabytes_allocated, although their noise profiles are incompatible (#27653): allocations are nearly deterministic, residency needs 10-20%, and peak is quantized to 1 MB. Any single tolerance is too tight for one metric or too slack for another. This migrates the remaining users of 'all' (and of the 'all' default) to explicit per-metric collection, ahead of removing 'all' from the driver. peak_megabytes_allocated is dropped everywhere: its 1 MB granularity makes tight relative windows meaningless (#27613), and it is sensitive to GC timing. In #27489 it drifted by -5.3% while max_bytes_used moved by less than 0.1%. Where a test guards a memory property, max_bytes_used covers it at byte granularity. Where the motivating ticket was about compile-time memory (T11545, T15304, T26425), residency remains gated via max_bytes_used, now with a residency-appropriate tolerance. max_bytes_used is dropped where residency was only ever an accident of 'all': * T15630, T15630a, T20261: the underlying tickets (#15630, #20261) contain no memory data at all. One is a simplifier-ticks blowup and the other is stated entirely in allocation numbers, so the 20% window never had teeth. * T21839c: #21839's measurements show residency essentially flat (+0.16%) while allocations moved +7%, so allocations are the discriminating metric. They are already gated at 1% via collect_compiler_runtime. The ghc/max gate had previously broken CI spuriously (9fd11585eb widened it from 1% to 10% for that reason). Allocation tolerances are tightened to the testsuite's conventional 2% where 'all' previously left them at 10-20%. Assisted-by: Claude Fable 5 - - - - - f10e513c by Simon Jakobi at 2026-08-14T12:54:21+02:00 testsuite: Remove the 'all' metric argument of collect_stats 'all' gated bytes allocated, max_bytes_used and peak_megabytes_allocated at a single tolerance, although their noise profiles are incompatible, making such tests either flaky or toothless (#27653). Closes #27653. Assisted-by: Claude Fable 5 - - - - - 90e010e3 by Simon Jakobi at 2026-08-14T12:54:21+02:00 testsuite: Make the deviation argument of collect_stats mandatory Almost every caller passes an explicit tolerance matched to the metric's noise profile, and the silent 20% default is far slacker than 'bytes allocated' merits. Only two tests relied on it. They now state their tolerance explicitly: large-project gets 10%, in line with other large compile-time tests. T9848 gets 2%: its metric is byte-for-byte deterministic across CI jobs and platforms of a given test_env, has drifted only about 2.5% since 2015, and the fusion failure it guards against would show up as a roughly +30000% jump. Assisted-by: Claude Fable 5 - - - - - 959 changed files: - .gitlab/ci.sh - + changelog.d/T20363 - + changelog.d/T27368-ppr-unreachable-cmm-blocks.md - + changelog.d/T27440 - + changelog.d/T27455 - + changelog.d/T27557 - + changelog.d/T27583 - + changelog.d/T27589 - + changelog.d/T27639 - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/link-deterministic-order - + changelog.d/refactor-known-names - compiler/GHC.hs - + compiler/GHC/Builtin.hs - + compiler/GHC/Builtin/KnownKeys.hs - + compiler/GHC/Builtin/KnownOccs.hs - + compiler/GHC/Builtin/Modules.hs - − compiler/GHC/Builtin/Names.hs - − compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/PrimOps/Casts.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - + compiler/GHC/Builtin/TH.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/Uniques.hs-boot - − compiler/GHC/Builtin/Utils.hs - + compiler/GHC/Builtin/WiredIn/Ids.hs - compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs - 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+ testsuite/tests/vdq-rta/should_fail/T27440e.stderr - + testsuite/tests/vdq-rta/should_fail/T27583f.hs - + testsuite/tests/vdq-rta/should_fail/T27583f.stderr - testsuite/tests/vdq-rta/should_fail/all.T - testsuite/tests/warnings/should_compile/DerivingTypeable.stderr - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Transform.hs - utils/check-exact/Utils.hs - utils/genprimopcode/Main.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface.hs - utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs - utils/haddock/haddock-api/src/Haddock/Interface/Create.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/77cc37649369e0ae1be1b0a7f6216d… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/77cc37649369e0ae1be1b0a7f6216d… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/romes/27461] 19 commits: hie.yaml: use a polyglot shell/batch script
by Rodrigo Mesquita (＠alt-romes) 14 Aug '26

14 Aug '26

Rodrigo Mesquita pushed to branch wip/romes/27461 at Glasgow Haskell Compiler / GHC Commits: 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(a)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(a)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(a)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 - - - - - 4137aaa4 by Rodrigo Mesquita at 2026-08-14T11:39:24+01:00 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. - - - - - dee6fefb by Rodrigo Mesquita at 2026-08-14T11:39:24+01:00 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 ------------------------- - - - - - 5505174a by Rodrigo Mesquita at 2026-08-14T11:39:25+01:00 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 ------------------------- - - - - - c719c415 by Rodrigo Mesquita at 2026-08-14T11:39:25+01:00 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. - - - - - 80ef9839 by Rodrigo Mesquita at 2026-08-14T11:39:25+01:00 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) - - - - - 895 changed files: - + changelog.d/T20363 - + changelog.d/downsweep-refactor - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/link-deterministic-order - + changelog.d/refactor-known-names - compiler/GHC.hs - + compiler/GHC/Builtin.hs - + compiler/GHC/Builtin/KnownKeys.hs - + compiler/GHC/Builtin/KnownOccs.hs - + compiler/GHC/Builtin/Modules.hs - − compiler/GHC/Builtin/Names.hs - − compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/PrimOps/Casts.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - + compiler/GHC/Builtin/TH.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/Uniques.hs-boot - − compiler/GHC/Builtin/Utils.hs - + compiler/GHC/Builtin/WiredIn/Ids.hs - compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs - compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs - compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs - compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/LiberateCase.hs - 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utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Transform.hs - utils/check-exact/Utils.hs - utils/check-ppr/Main.hs - utils/genprimopcode/Main.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface.hs - utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs - utils/haddock/haddock-api/src/Haddock/Interface/Create.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/f74959b3a2c22b03eb0ea3d35e2da6… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/f74959b3a2c22b03eb0ea3d35e2da6… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][master] 2 commits: testsuite: Drop peak_megabytes_allocated from LinkableUsage tests
by Marge Bot (＠marge-bot) 14 Aug '26

14 Aug '26

Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC Commits: 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 - - - - - 2 changed files: - testsuite/driver/perf_notes.py - testsuite/tests/bytecode/TLinkable/all.T Changes: ===================================== testsuite/driver/perf_notes.py ===================================== @@ -156,8 +156,8 @@ class RelativeMetricAcceptanceWindow(MetricAcceptanceWindow): self.__tol = tol def get_bounds(self, baseline: float) -> Tuple[float, float]: - lowerBound = trunc( int(baseline) * ((100 - float(self.__tol))/100)) - upperBound = trunc(0.5 + ceil(int(baseline) * ((100 + float(self.__tol))/100))) + lowerBound = trunc( baseline * ((100 - float(self.__tol))/100)) + upperBound = trunc(0.5 + ceil(baseline * ((100 + float(self.__tol))/100))) return (lowerBound, upperBound) ===================================== testsuite/tests/bytecode/TLinkable/all.T ===================================== @@ -3,7 +3,8 @@ # after they have been loaded into the `LoaderState`. # However, this property is currently not validated automatically. test('LinkableUsage01' - , [ collect_compiler_stats('all', 2) + , [ collect_compiler_stats('bytes allocated', 2) + , collect_compiler_stats('max_bytes_used', 5) , extra_files(['genLinkables.sh', 'BCOTemplate.hs']) , pre_cmd('$MAKE -s --no-print-directory LinkableUsage01_Prep') , req_bco @@ -18,7 +19,8 @@ test('LinkableUsage01' # Performance test for bytecode `Linkable`s. test('LinkableUsage02' - , [ collect_compiler_stats('all', 2) + , [ collect_compiler_stats('bytes allocated', 2) + , collect_compiler_stats('max_bytes_used', 5) , extra_files(['genLinkables.sh', 'BCOTemplate.hs']) , pre_cmd('$MAKE -s --no-print-directory LinkableUsage02_Prep') , req_bco View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/b19fcc1c0aa8ca80511fe733d8a23b… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/b19fcc1c0aa8ca80511fe733d8a23b… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][master] 2 commits: Major patch to re-engineer known-key names
by Marge Bot (＠marge-bot) 14 Aug '26

14 Aug '26

Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC Commits: 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(a)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'. - - - - - 793 changed files: - + changelog.d/refactor-known-names - compiler/GHC.hs - + compiler/GHC/Builtin.hs - + compiler/GHC/Builtin/KnownKeys.hs - + compiler/GHC/Builtin/KnownOccs.hs - + compiler/GHC/Builtin/Modules.hs - − compiler/GHC/Builtin/Names.hs - − compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/PrimOps/Casts.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - + compiler/GHC/Builtin/TH.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/Uniques.hs-boot - − compiler/GHC/Builtin/Utils.hs - + compiler/GHC/Builtin/WiredIn/Ids.hs - compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs - compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs - compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs - compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/LiberateCase.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/SpecConstr.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/CoreToStg.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Config/Tidy.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Env/KnotVars.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main/Hsc.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/MakeFile.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Plugins.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/Hs/Lit.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Syn/Type.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Arrows.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/C.hs - 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compiler/GHC/IfaceToCore.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/Errors/Ppr.hs - compiler/GHC/Parser/Header.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Plugins.hs - compiler/GHC/Rename/Env.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Lit.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/Rename/Unbound.hs - compiler/GHC/Rename/Utils.hs - compiler/GHC/Runtime/Context.hs - compiler/GHC/Runtime/Debugger.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Runtime/Heap/Inspect.hs - compiler/GHC/Runtime/Interpreter.hs - compiler/GHC/Runtime/Loader.hs - compiler/GHC/Stg/BcPrep.hs - compiler/GHC/Stg/Unarise.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm/Bind.hs - compiler/GHC/StgToCmm/DataCon.hs - compiler/GHC/StgToCmm/Env.hs - compiler/GHC/StgToCmm/Foreign.hs - compiler/GHC/StgToCmm/Lit.hs - compiler/GHC/StgToCmm/Ticky.hs - 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compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/Hint.hs - compiler/GHC/Types/Hint/Ppr.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/Literal.hs - compiler/GHC/Types/Name.hs - compiler/GHC/Types/Name/Cache.hs - compiler/GHC/Types/Name/Ppr.hs - compiler/GHC/Types/Name/Reader.hs - compiler/GHC/Types/RepType.hs - compiler/GHC/Types/TyThing.hs - compiler/GHC/Types/Unique.hs - compiler/GHC/Types/Unique/FM.hs - + compiler/GHC/Types/UnresolvedImport.hs - compiler/GHC/Types/Var.hs - compiler/GHC/Unit.hs - compiler/GHC/Unit/External.hs - compiler/GHC/Unit/External/Index.hs - compiler/GHC/Unit/External/ModuleOrigin.hs - compiler/GHC/Unit/External/Providers.hs - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/Finder/Types.hs - compiler/GHC/Unit/Module/Deps.hs - compiler/GHC/Unit/Module/ModSummary.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Unit/Types.hs - compiler/GHC/Utils/Binary.hs - − compiler/GHC/Utils/Binary/Typeable.hs - compiler/Language/Haskell/Syntax/Expr.hs - compiler/ghc.cabal.in - docs/users_guide/separate_compilation.rst - ghc/GHCi/UI.hs - ghc/GHCi/UI/Monad.hs - ghc/Main.hs - libraries/base/base.cabal.in - libraries/base/src/Control/Applicative.hs - libraries/base/src/Control/Concurrent.hs - libraries/base/src/Control/Concurrent/Chan.hs - libraries/base/src/Control/Concurrent/QSem.hs - libraries/base/src/Control/Concurrent/QSemN.hs - libraries/base/src/Data/Array/Byte.hs - libraries/base/src/Data/Bifoldable.hs - libraries/base/src/Data/Bifoldable1.hs - libraries/base/src/Data/Bifunctor.hs - libraries/base/src/Data/Bitraversable.hs - libraries/base/src/Data/Bool.hs - libraries/base/src/Data/Complex.hs - libraries/base/src/Data/Data.hs - libraries/base/src/Data/Enum.hs - libraries/base/src/Data/Fixed.hs - libraries/base/src/Data/Foldable1.hs - libraries/base/src/Data/Functor/Classes.hs - libraries/base/src/Data/Functor/Compose.hs - libraries/base/src/Data/Functor/Contravariant.hs - libraries/base/src/Data/Functor/Product.hs - libraries/base/src/Data/Functor/Sum.hs - libraries/base/src/Data/List.hs - libraries/base/src/Data/List/NonEmpty.hs - libraries/base/src/Data/List/NubOrdSet.hs - libraries/base/src/Data/Semigroup.hs - libraries/base/src/Data/Version.hs - libraries/base/src/GHC/Base.hs - libraries/base/src/GHC/ByteOrder.hs - + libraries/base/src/GHC/Essentials.hs - libraries/base/src/GHC/Exts.hs - libraries/base/src/GHC/Fingerprint.hs - libraries/base/src/GHC/RTS/Flags.hs - libraries/base/src/GHC/ResponseFile.hs - libraries/base/src/GHC/Stats.hs - libraries/base/src/GHC/Weak/Finalize.hs - libraries/base/src/Numeric.hs - libraries/base/src/Prelude.hs - libraries/base/src/System/CPUTime/Posix/ClockGetTime.hsc - libraries/base/src/System/CPUTime/Posix/RUsage.hsc - libraries/base/src/System/CPUTime/Posix/Times.hsc - libraries/base/src/System/CPUTime/Unsupported.hs - libraries/base/src/System/Console/GetOpt.hs - libraries/base/src/System/Exit.hs - libraries/base/src/System/IO.hs - libraries/base/src/System/IO/OS.hs - libraries/base/src/System/IO/Unsafe.hs - 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libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs-boot - libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs - libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs-boot - libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs - libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs-boot - libraries/ghc-internal/src/GHC/Internal/Bignum/Primitives.hs - libraries/ghc-internal/src/GHC/Internal/Bignum/WordArray.hs - libraries/ghc-internal/src/GHC/Internal/Bits.hs - libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs - libraries/ghc-internal/src/GHC/Internal/CString.hs - libraries/ghc-internal/src/GHC/Internal/Char.hs - libraries/ghc-internal/src/GHC/Internal/Classes.hs - libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs - libraries/ghc-internal/src/GHC/Internal/Clock.hsc - libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs - libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs - libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs - libraries/ghc-internal/src/GHC/Internal/Conc/POSIX.hs - 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testsuite/tests/simplCore/should_compile/T9400.stderr - testsuite/tests/simplCore/should_compile/noinline01.stderr - testsuite/tests/simplCore/should_compile/par01.stderr - testsuite/tests/simplCore/should_compile/rule2.stderr - testsuite/tests/simplCore/should_compile/str-rules.hs - testsuite/tests/tcplugins/ArgsPlugin.hs - testsuite/tests/tcplugins/EmitWantedPlugin.hs - testsuite/tests/tcplugins/RewritePlugin.hs - testsuite/tests/tcplugins/T26395_Plugin.hs - testsuite/tests/tcplugins/TyFamPlugin.hs - testsuite/tests/th/T14741.hs - testsuite/tests/th/T21547.stderr - testsuite/tests/th/T26568.stderr - + testsuite/tests/th/T27013th.hs - testsuite/tests/th/TH_Roles2.stderr - + testsuite/tests/th/TH_pragmaSpecOld.hs - + testsuite/tests/th/TH_pragmaSpecOld.stderr - testsuite/tests/th/all.T - testsuite/tests/typecheck/should_compile/T13032.stderr - testsuite/tests/typecheck/should_compile/T14273.stderr - testsuite/tests/typecheck/should_compile/T18406b.stderr - testsuite/tests/typecheck/should_compile/T18529.stderr - testsuite/tests/typecheck/should_compile/holes.stderr - testsuite/tests/typecheck/should_compile/holes2.stderr - testsuite/tests/typecheck/should_compile/holes3.stderr - testsuite/tests/typecheck/should_compile/subsumption_sort_hole_fits.stderr - testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr - testsuite/tests/typecheck/should_fail/T12921.stderr - testsuite/tests/typecheck/should_fail/T14884.stderr - testsuite/tests/typecheck/should_fail/T15883b.stderr - testsuite/tests/typecheck/should_fail/T15883c.stderr - testsuite/tests/typecheck/should_fail/T15883d.stderr - testsuite/tests/typecheck/should_fail/T21130.stderr - testsuite/tests/typecheck/should_fail/T3323.stderr - testsuite/tests/typecheck/should_fail/T5095.stderr - testsuite/tests/typecheck/should_fail/T7279.stderr - testsuite/tests/typecheck/should_fail/TcStaticPointersFail02.stderr - testsuite/tests/typecheck/should_fail/TyAppPat_PatternBindingExistential.stderr - testsuite/tests/typecheck/should_fail/tcfail072.stderr - testsuite/tests/typecheck/should_fail/tcfail097.stderr - testsuite/tests/typecheck/should_fail/tcfail133.stderr - testsuite/tests/typecheck/should_run/T22510.stdout - testsuite/tests/unboxedsums/UbxSumLevPoly.hs - testsuite/tests/unboxedsums/unboxedsums_unit_tests.hs - testsuite/tests/warnings/should_compile/DerivingTypeable.stderr - utils/check-exact/Utils.hs - utils/genprimopcode/Main.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface.hs - utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs - utils/haddock/haddock-api/src/Haddock/Interface/Create.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/257c3ed798edf8a7c24049cb6365a3… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/257c3ed798edf8a7c24049cb6365a3… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][master] Increase test coverage of diagnostics, batch 2
by Marge Bot (＠marge-bot) 14 Aug '26

14 Aug '26

Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC Commits: 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 - - - - - 36 changed files: - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Types/Error/Codes.hs - testsuite/tests/diagnostic-codes/codes.stdout - testsuite/tests/ffi/should_fail/all.T - + testsuite/tests/ffi/should_fail/ccfail006.hs - + testsuite/tests/ffi/should_fail/ccfail006.stderr - + testsuite/tests/ffi/should_fail/ccfail007.hs - + testsuite/tests/ffi/should_fail/ccfail007.stderr - + testsuite/tests/ffi/should_fail/ccfail008.hs - + testsuite/tests/ffi/should_fail/ccfail008.stderr - + testsuite/tests/ffi/should_fail/ccfail009.hs - + testsuite/tests/ffi/should_fail/ccfail009.stderr - + testsuite/tests/th/AssocDefaultNotAssoc.hs - + testsuite/tests/th/AssocDefaultNotAssoc.stderr - + testsuite/tests/th/TH_InvalidTopDecl.hs - + testsuite/tests/th/TH_InvalidTopDecl.stderr - + testsuite/tests/th/TH_cvt_DefaultDataInstDecl.hs - + testsuite/tests/th/TH_cvt_DefaultDataInstDecl.stderr - + testsuite/tests/th/TH_cvt_GadtNoCons.hs - + testsuite/tests/th/TH_cvt_GadtNoCons.stderr - + testsuite/tests/th/TH_cvt_IllegalDeclaration.hs - + testsuite/tests/th/TH_cvt_IllegalDeclaration.stderr - + testsuite/tests/th/TH_cvt_IllegalSumAlt.hs - + testsuite/tests/th/TH_cvt_IllegalSumAlt.stderr - + testsuite/tests/th/TH_cvt_InvalidCCallImpent.hs - + testsuite/tests/th/TH_cvt_InvalidCCallImpent.stderr - + testsuite/tests/th/TH_cvt_InvalidTyFamInstLHS.hs - + testsuite/tests/th/TH_cvt_InvalidTyFamInstLHS.stderr - + testsuite/tests/th/TH_cvt_InvalidTypeInstanceHeader.hs - + testsuite/tests/th/TH_cvt_InvalidTypeInstanceHeader.stderr - + testsuite/tests/th/TH_cvt_RecGadtNoCons.hs - + testsuite/tests/th/TH_cvt_RecGadtNoCons.stderr - + testsuite/tests/th/TH_cvt_SumAltArityExceeded.hs - + testsuite/tests/th/TH_cvt_SumAltArityExceeded.stderr - testsuite/tests/th/all.T The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/b19fcc1c0aa8ca80511fe733d8a23b6… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/b19fcc1c0aa8ca80511fe733d8a23b6… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/sjakobi/T25233] X86 NCG: use btr/bts/btc for single-bit operations
by Simon Jakobi (＠sjakobi) 14 Aug '26

14 Aug '26

Simon Jakobi pushed to branch wip/sjakobi/T25233 at Glasgow Haskell Compiler / GHC Commits: 69637171 by Simon Jakobi at 2026-08-14T10:44:22+02:00 X86 NCG: use btr/bts/btc for single-bit operations Previously the Cmm patterns x & ~(1 << i) x | (1 << i) x ^ (1 << i) compiled to mov/shl/not/and-style sequences of 3-4 instructions. Now they compile to a single btr, bts or btc, matching what C compilers produce. When the bit index is a literal, constant folding has already collapsed these patterns into ones with a literal mask, such as x & 0xfffffeffffffffff for x & ~(1 << 40). Such masks are now also compiled to a bit-test instruction when they don't fit in an imm32 and would otherwise have to be loaded into a register first. For a variable bit index, this applies only when the shift is unchecked (uncheckedShiftL#, Data.Bits.unsafeShiftL): the bounds-checked shiftL used by e.g. the default clearBit/setBit/complementBit implementations wraps the shift in a bounds mask that this optimisation does not see through. With a literal index, the bounds mask is constant-folded away, so the checked operations benefit too. See Note [Bit-test instructions] in GHC.CmmToAsm.X86.CodeGen. Fixes #25233. Assisted-by: Claude Fable 5 - - - - - 7 changed files: - + changelog.d/ncg-x86-bit-test-instructions - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - + testsuite/tests/codeGen/should_gen_asm/T25233.asm - + testsuite/tests/codeGen/should_gen_asm/T25233.hs - testsuite/tests/codeGen/should_gen_asm/all.T Changes: ===================================== changelog.d/ncg-x86-bit-test-instructions ===================================== @@ -0,0 +1,20 @@ +section: compiler +synopsis: The x86 native code generator now uses the bit-test instructions + ``btr``/``bts``/``btc`` to clear, set or complement a single bit +description: + Cmm patterns such as ``x & ~(1 << i)``, ``x | (1 << i)`` and + ``x ^ (1 << i)`` now compile to a single ``btr``/``bts``/``btc`` + instruction instead of a mov/shl/not/and-style sequence, matching what C + compilers produce. The same applies to the literal masks that constant + folding produces from these patterns when ``i`` is constant, in the cases + where the mask doesn't fit in an imm32 operand. + + For a variable bit index this applies only when the shift is unchecked, + as with ``uncheckedShiftL#`` or ``Data.Bits.unsafeShiftL``. The + bounds-checked ``shiftL`` — used, for example, by the default + implementations of ``clearBit``, ``setBit`` and ``complementBit`` — + wraps the shift in a bounds mask that this optimisation does not see + through. With a literal index, the bounds mask is constant-folded away, + so the checked operations benefit too. +mrs: !16311 +issues: #25233 ===================================== compiler/GHC/CmmToAsm/X86/CodeGen.hs ===================================== @@ -1442,6 +1442,44 @@ getRegister' platform is32Bit (CmmMachOp mop [x]) = do -- unary MachOps (PUNPCKLQDQ fmt (OpReg dst) dst) ) +-- Use the bit-test instructions btr/bts/btc for clearing, setting and +-- complementing a single, variable bit: e.g. x .&. complement (1 `shiftL` i) +-- is btr. See Note [Bit-test instructions]. +getRegister' _ is32Bit (CmmMachOp (MO_And w) [x, CmmMachOp (MO_Not _) [y]]) + | Just i <- singleBit_maybe y, bitTestOpWidthOK is32Bit w + = genBitTestCode (intFormat w) BTR x i +getRegister' _ is32Bit (CmmMachOp (MO_And w) [CmmMachOp (MO_Not _) [y], x]) + | Just i <- singleBit_maybe y, bitTestOpWidthOK is32Bit w + = genBitTestCode (intFormat w) BTR x i +getRegister' _ is32Bit (CmmMachOp (MO_Or w) [x, y]) + | Just i <- singleBit_maybe y, bitTestOpWidthOK is32Bit w + = genBitTestCode (intFormat w) BTS x i +getRegister' _ is32Bit (CmmMachOp (MO_Or w) [y, x]) + | Just i <- singleBit_maybe y, bitTestOpWidthOK is32Bit w + = genBitTestCode (intFormat w) BTS x i +getRegister' _ is32Bit (CmmMachOp (MO_Xor w) [x, y]) + | Just i <- singleBit_maybe y, bitTestOpWidthOK is32Bit w + = genBitTestCode (intFormat w) BTC x i +getRegister' _ is32Bit (CmmMachOp (MO_Xor w) [y, x]) + | Just i <- singleBit_maybe y, bitTestOpWidthOK is32Bit w + = genBitTestCode (intFormat w) BTC x i + +-- The same operations with a literal bit index: constant folding has turned +-- the mask itself into a literal, so use a bit-test instruction whenever the +-- mask does not fit in an imm32. See Note [Bit-test instructions]. +getRegister' platform is32Bit (CmmMachOp (MO_And w) [x, CmmLit lit@(CmmInt m _)]) + | Just i <- clearBitLit_maybe w m, bitTestOpWidthOK is32Bit w + , not (is32BitLit platform lit) + = genBitTestImmCode (intFormat w) BTR x i +getRegister' platform is32Bit (CmmMachOp (MO_Or w) [x, CmmLit lit@(CmmInt m _)]) + | Just i <- setBitLit_maybe w m, bitTestOpWidthOK is32Bit w + , not (is32BitLit platform lit) + = genBitTestImmCode (intFormat w) BTS x i +getRegister' platform is32Bit (CmmMachOp (MO_Xor w) [x, CmmLit lit@(CmmInt m _)]) + | Just i <- setBitLit_maybe w m, bitTestOpWidthOK is32Bit w + , not (is32BitLit platform lit) + = genBitTestImmCode (intFormat w) BTC x i + getRegister' platform is32Bit (CmmMachOp mop [x, y]) = do -- dyadic MachOps sse4_1 <- sse4_1Enabled sse4_2 <- sse4_2Enabled @@ -5883,6 +5921,100 @@ genTrivialCode rep instr a b = do instr b_op dst return (Any rep code) +{- Note [Bit-test instructions] +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +x86 has dedicated instructions for clearing (btr), setting (bts) and +complementing (btc) a single bit whose index is given in a register. We use +them for Cmm patterns such as + + x & ~(1 << i) ==> btr i, x (#25233) + +replacing a mov/shl/not/and sequence with a single instruction. The +shift-count register operand of shl is masked modulo the operand width, and +the bit-offset register operand of btr/bts/btc is masked the same way, so +the replacement is faithful even for out-of-range i (where the Cmm shift is +in any case undefined). + +The bit-offset operand of these instructions must be an immediate or a +register. When the bit index is a literal, no shift reaches the NCG: +constant folding has already turned the whole mask into a literal. If that +mask fits in an imm32, an ordinary and/or/xor with an immediate is at least +as good; but a W64 mask touching the upper bits, e.g. ~(1 << 40), would have +to be moved into a register first. For such masks we recognise the folded +literal itself (exactly one bit clear resp. set) and emit btr/bts/btc with +an immediate bit offset. + +We restrict the pattern to W32 and native-width W64: the instructions do not +exist at width 8, and sub-word Cmm operations at W8/W16 are rare enough that +they are not worth the extra care. +-} + +-- | Match @1 << i@, returning @i@. +-- +-- The returned expression is always at word width ('machOpArgReps' fixes +-- shift amounts at 'wordWidth'). See Note [Bit-test instructions]. +singleBit_maybe :: CmmExpr -> Maybe CmmExpr +singleBit_maybe (CmmMachOp (MO_Shl _) [CmmLit (CmmInt 1 _), i]) = Just i +singleBit_maybe _ = Nothing + +-- | If exactly one bit of @m@, taken at width @w@, is set, return its index. +-- +-- See Note [Bit-test instructions]. +setBitLit_maybe :: Width -> Integer -> Maybe Int +setBitLit_maybe w m + | popCount m' == 1 = Just (countTrailingZeros m') + | otherwise = Nothing + where + -- w <= W64 in this X86-specific code, so a Word64 suffices. + m' = fromInteger (narrowU w m) :: Word64 + +-- | If exactly one bit of @m@, taken at width @w@, is clear, return its +-- index. +-- +-- See Note [Bit-test instructions]. +clearBitLit_maybe :: Width -> Integer -> Maybe Int +clearBitLit_maybe w m = setBitLit_maybe w (complement m) + +bitTestOpWidthOK :: Bool -> Width -> Bool +bitTestOpWidthOK is32Bit w = w == W32 || (w == W64 && not is32Bit) + +-- | Generate code for @dst := x@ followed by a bit-test instruction +-- (btr/bts/btc) with bit offset @i@. +-- +-- Analogous to 'genTrivialCode', but the offset operand must be a register, +-- not memory. See Note [Bit-test instructions]. +genBitTestCode :: Format -> (Format -> Operand -> Operand -> Instr) + -> CmmExpr -> CmmExpr -> NatM Register +genBitTestCode rep instr x i = do + (i_reg, i_code) <- getNonClobberedReg i + x_code <- getAnyReg x + tmp <- getNewRegNat rep + let + -- As in genTrivialCode, 'i' must stay alive across the computation of + -- 'x' into dst, so save it in a temporary if dst holds 'i'. + code dst + | dst == i_reg = + i_code `appOL` + unitOL (MOV rep (OpReg i_reg) (OpReg tmp)) `appOL` + x_code dst `snocOL` + instr rep (OpReg tmp) (OpReg dst) + | otherwise = + i_code `appOL` + x_code dst `snocOL` + instr rep (OpReg i_reg) (OpReg dst) + return (Any rep code) + +-- | Generate code for @dst := x@ followed by a bit-test instruction +-- (btr/bts/btc) with an immediate bit offset. +-- +-- See Note [Bit-test instructions]. +genBitTestImmCode :: Format -> (Format -> Operand -> Operand -> Instr) + -> CmmExpr -> Int -> NatM Register +genBitTestImmCode rep instr x i = do + x_code <- getAnyReg x + let code dst = x_code dst `snocOL` instr rep (OpImm (ImmInt i)) (OpReg dst) + return (Any rep code) + regClashesWithOp :: Reg -> Operand -> Bool reg `regClashesWithOp` OpReg reg2 = reg == reg2 reg `regClashesWithOp` OpAddr amode = any (==reg) (addrModeRegs amode) ===================================== compiler/GHC/CmmToAsm/X86/Instr.hs ===================================== @@ -193,6 +193,12 @@ data Instr | SHLD Format Operand{-amount-} Operand Operand | BT Format Imm Operand + -- | Bit test-and-reset + | BTR Format Operand{- ^ bit offset (imm/reg) -} Operand + -- | Bit set + | BTS Format Operand{- ^ bit offset (imm/reg) -} Operand + -- | Bit complement + | BTC Format Operand{- ^ bit offset (imm/reg) -} Operand | NOP @@ -496,6 +502,9 @@ regUsageOfInstr platform instr SHLD fmt imm dst1 dst2 -> usageRMM fmt imm dst1 dst2 SHRD fmt imm dst1 dst2 -> usageRMM fmt imm dst1 dst2 BT fmt _ src -> mkRUR (use_R fmt src []) + BTR fmt off dst -> usageRM fmt off dst + BTS fmt off dst -> usageRM fmt off dst + BTC fmt off dst -> usageRM fmt off dst PUSH fmt op -> mkRUR (use_R fmt op []) POP fmt op -> mkRU [] (def_W fmt op) @@ -830,6 +839,9 @@ patchRegsOfInstr platform instr env SHLD fmt imm dst1 dst2 -> patch2 (SHLD fmt imm) dst1 dst2 SHRD fmt imm dst1 dst2 -> patch2 (SHRD fmt imm) dst1 dst2 BT fmt imm src -> patch1 (BT fmt imm) src + BTR fmt off dst -> patch2 (BTR fmt) off dst + BTS fmt off dst -> patch2 (BTS fmt) off dst + BTC fmt off dst -> patch2 (BTC fmt) off dst TEST fmt src dst -> patch2 (TEST fmt) src dst CMP fmt src dst -> patch2 (CMP fmt) src dst PUSH fmt op -> patch1 (PUSH fmt) op ===================================== compiler/GHC/CmmToAsm/X86/Ppr.hs ===================================== @@ -862,6 +862,15 @@ pprInstr platform i = case i of BT format imm src -> pprFormatImmOp (text "bt") format imm src + BTR format off dst + -> pprFormatOpOp (text "btr") format off dst + + BTS format off dst + -> pprFormatOpOp (text "bts") format off dst + + BTC format off dst + -> pprFormatOpOp (text "btc") format off dst + CMP format src dst | isFloatFormat format -> pprFormatOpOp (text "ucomi") format src dst -- SSE2 | otherwise -> pprFormatOpOp (text "cmp") format src dst ===================================== testsuite/tests/codeGen/should_gen_asm/T25233.asm ===================================== @@ -0,0 +1,9 @@ +btrq +btsq +btcq +btrl +btsl +btcl +btrq $40, +btsq $40, +btcq $40, ===================================== testsuite/tests/codeGen/should_gen_asm/T25233.hs ===================================== @@ -0,0 +1,39 @@ +{-# LANGUAGE MagicHash #-} + +-- Check that clearing/setting/complementing a single, variable bit +-- uses the btr/bts/btc instructions (#25233). +module T25233 where + +import GHC.Exts + +myClearBit :: Word# -> Int# -> Word# +myClearBit x i = x `and#` not# (1## `uncheckedShiftL#` i) + +mySetBit :: Word# -> Int# -> Word# +mySetBit x i = x `or#` (1## `uncheckedShiftL#` i) + +myComplementBit :: Word# -> Int# -> Word# +myComplementBit x i = x `xor#` (1## `uncheckedShiftL#` i) + +myClearBit32 :: Word32# -> Int# -> Word32# +myClearBit32 x i = + x `andWord32#` notWord32# (wordToWord32# 1## `uncheckedShiftLWord32#` i) + +mySetBit32 :: Word32# -> Int# -> Word32# +mySetBit32 x i = x `orWord32#` (wordToWord32# 1## `uncheckedShiftLWord32#` i) + +myComplementBit32 :: Word32# -> Int# -> Word32# +myComplementBit32 x i = + x `xorWord32#` (wordToWord32# 1## `uncheckedShiftLWord32#` i) + +-- With a constant bit index >= 32, the mask constant-folds to a literal +-- that does not fit in an imm32, so a bit-test instruction with an +-- immediate offset is used. +myClearBit40 :: Word# -> Word# +myClearBit40 x = x `and#` not# (1## `uncheckedShiftL#` 40#) + +mySetBit40 :: Word# -> Word# +mySetBit40 x = x `or#` (1## `uncheckedShiftL#` 40#) + +myComplementBit40 :: Word# -> Word# +myComplementBit40 x = x `xor#` (1## `uncheckedShiftL#` 40#) ===================================== testsuite/tests/codeGen/should_gen_asm/all.T ===================================== @@ -23,6 +23,8 @@ test('avx512-int64-minmax', [unless(arch('x86_64'), skip), when(unregisterised(), skip)], compile_grep_asm, ['hs', True, '-mavx512vl']) test('avx512-word64-minmax', [unless(arch('x86_64'), skip), when(unregisterised(), skip)], compile_grep_asm, ['hs', True, '-mavx512vl']) +test('T25233', [unless(arch('x86_64'), skip), + when(unregisterised(), skip)], compile_grep_asm, ['hs', True, '-O']) is_aarch64_codegen = [ unless(arch('aarch64'), skip), when(unregisterised(), skip), View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6963717182f0070c6c041f71a281216… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6963717182f0070c6c041f71a281216… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/27627] Make isTerminatingType look through unary classes
by Zubin (＠wz1000) 14 Aug '26

14 Aug '26

Zubin pushed to branch wip/27627 at Glasgow Haskell Compiler / GHC Commits: 5d8c2279 by Zubin Duggal at 2026-08-14T14:17:42+05:30 Make isTerminatingType look through unary classes A unary class is represented by its field, so it can be bottom precisely when its field can be bottom. Also add a core lint check to ensure there are no bindings whose type is `isTerminatingType` but their rhs is bottom Fixes #27627 - - - - - 14 changed files: - + changelog.d/27627 - compiler/GHC/Core.hs - compiler/GHC/Core/DataCon.hs-boot - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/Types/RepType.hs - + testsuite/tests/core-to-stg/T27627/Callee.hs - + testsuite/tests/core-to-stg/T27627/Caller.hs - + testsuite/tests/core-to-stg/T27627/Main.hs - + testsuite/tests/core-to-stg/T27627/T27627.stdout - + testsuite/tests/core-to-stg/T27627/all.T Changes: ===================================== changelog.d/27627 ===================================== @@ -0,0 +1,5 @@ +section: compiler +synopsis: Fix a bug where an absent dictionary argument of a unary class could + be replaced by an error thunk, which GHC then evaluated, crashing the program. +mrs: !16519 +issues: #27627 ===================================== compiler/GHC/Core.hs ===================================== @@ -644,21 +644,20 @@ parts of the compilation pipeline. Note [NON-BOTTOM-DICTS invariant] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -It is a global invariant (not checkable by Lint) that +It is a global invariant that - every non-newtype dictionary-typed expression is non-bottom. + a dictionary-typed expression is never bottom, -These conditions are captured by GHC.Core.Type.isTerminatingType. +The exception is unary classes; see (1) below. +GHC.Core.Type.isTerminatingType says which types the invariant covers. -How are we so sure about this? Dictionaries are built by GHC in only two ways: +How are we so sure about this? GHC builds a dictionary in only two ways: * A dictionary function (DFun), arising from an instance declaration. DFuns do no computation: they always return a data constructor immediately. See DFunUnfolding in GHC.Core. So the result of a call to a DFun is always non-bottom. - Exception: newtype dictionaries. - Plus: see the Very Nasty Wrinkle in Note [Speculative evaluation] in GHC.CoreToStg.Prep @@ -666,20 +665,89 @@ How are we so sure about this? Dictionaries are built by GHC in only two ways: see Note [Recursive superclasses] and Note [Solving superclass constraints] in GHC.Tc.TyCl.Instance. -A bad Core-to-Core pass could invalidate this reasoning, but that's too bad. -It's still an invariant of Core programs generated by GHC from Haskell, and -Core-to-Core passes maintain it. +(1) Unary classes + +The dictionary of a unary class is not a data constructor application at all: +it *is* its single field. See Note [Unary class magic] in GHC.Core.TyCon. +So for + + class Eq a => C1 a where { op :: a -> a } -- Two fields: not unary + class Eq a => C2 a -- One field: unary + class D a where { meth :: a -> a } -- One field: unary + +a (C1 a) dictionary is a data constructor application, so it cannot be bottom. +A (C2 a) dictionary is precisely the (Eq a) dictionary it wraps, which cannot +be bottom either. But a (D a) dictionary is precisely the function `meth`, and +the programmer can write + + instance D Int where meth = undefined + +so it can perfectly well bottom. + +`isTerminatingType` therefore looks through unary classes, one field at a time, +until it reaches a type that is not a unary class: + + isTerminatingType (C1 a) = True -- Stops at once: C1 is not unary + isTerminatingType (C2 a) = True -- Looks through C2, reaches (Eq a) + isTerminatingType (D a) = False -- Looks through D, reaches (a -> a) + +(2) Two kinds of callers, pulling in opposite directions + +Some code __relies__ on a dictionary being non-bottom, and evaluates one eagerly +on the basis of that: + + * -fdicts-strict makes dictionary arguments strict. + See GHC.Types.Demand.strictifyDictDmd + + * exprOkForSpeculation says that (eq_sel d) terminates, so that + case (eq_sel d) of _ -> blah + can be discarded (exprOkToDiscard), or evaluated ahead of time. See + Note [exprOkForSpeculation and type classes] in GHC.Core.Utils and + Note [Speculative evaluation] in GHC.CoreToStg.Prep + +Other code would otherwise __create__ a bottom value at a dictionary type, and +it must not: + + * Worker/wrapper replaces an absent argument with an error thunk or a + rubbish literal. See Note [Don't make fillers for terminating types] + in GHC.Core.Opt.WorkWrap.Utils + +isTerminatingType is the condition used by both, so we the latter +kind of caller doesn't put bottoms in places where the former kind of +caller requires them to be absent. + +The result of `isTerminatingType` depnds only on the type at the end of the +chain of fields, so `isTerminatingType` returns the same thing for a unary class +and its field: if it says False for (C2 a) then it also says False for (Eq a). +#27627 is an example of how we got it wrong before. `isTerminatingType` used +to stop at the unary class C2 rather than look through it, so worker/wrapper +made an error thunk for a (C2 a) dictionary, while exprOkForSpeculation +evaluated that very same value as a (Eq a) dictionary. + +(3) Cyclic superclasses + +With UndecidableSuperClasses the chain of fields can loop back on itself: + + class D2 a => D1 a + class D1 a => D2 a + +`isTerminatingType` returns false as soon as it detects a cycle + +(4) Keeping the invariant true + +We can check the invariant in core lint: `lintLetBind` rejects a binding +whose type is terminating and whose right hand side is bottom. It checks +bindings only, which is where the absent-filler machinery of worker/wrapper and +Specialise puts such values. -Why is it useful to know that dictionaries are non-bottom? +However, there is a complication. With -fdefer-type-errors (and +-fdefer-typed-holes, and friends) GHC binds a dictionary it could not solve to +`typeError`, which is bottom: -1. It justifies the use of `-XDictsStrict`; - see `GHC.Core.Types.Demand.strictifyDictDmd` + $dEq :: Eq T + $dEq = case typeError "No instance for (Eq T) ..."# of {} -2. It means that (eq_sel d) is ok-for-speculation and thus - case (eq_sel d) of _ -> blah - can be discarded by the Simplifier. See these Notes: - Note [exprOkForSpeculation and type classes] in GHC.Core.Utils - Note[Speculative evaluation] in GHC.CoreToStg.Prep +`GHC.Core.Lint.isDeferredTypeError` handles this. Note [Case expression invariants] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ===================================== compiler/GHC/Core/DataCon.hs-boot ===================================== @@ -22,6 +22,7 @@ dataConUserTyVars :: DataCon -> [TyVar] dataConUserTyVarBinders :: DataCon -> [TyVarBinder] dataConSourceArity :: DataCon -> Arity dataConFieldLabels :: DataCon -> [FieldLabel] +dataConInstArgTys :: DataCon -> [Type] -> [Scaled Type] dataConInstOrigArgTys :: DataCon -> [Type] -> [Scaled Type] dataConStupidTheta :: DataCon -> ThetaType dataConFullSig :: DataCon ===================================== compiler/GHC/Core/Lint.hs ===================================== @@ -563,6 +563,15 @@ lintLetBind top_lvl rec_flag binder rhs rhs_ty || exprIsTickedString rhs) (mkTopNonLitStrMsg binder) + -- Check that we have not bound bottom at a type whose values are + -- assumed to be non-bottom, such as a dictionary. (See #24934, #25924, #27627). + -- A deferred type error is an exception. + -- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core + ; checkL (not (isTerminatingType binder_ty) + || not (exprIsDeadEnd rhs) + || isDeferredTypeError rhs) + (mkBottomTerminatingTyMsg binder) + ; flags <- getLintFlags -- Check that a join-point binder has a valid type @@ -3814,6 +3823,28 @@ mkTopNonLitStrMsg :: Id -> SDoc mkTopNonLitStrMsg binder = hsep [text "Top-level Addr# binder has a non-literal rhs:", ppr binder] +isDeferredTypeError :: CoreExpr -> Bool +-- ^ True if it contains a call to `typeError` like -fdefer-type-errors and its +-- relatives insert, such as +-- case typeError @LiftedRep @() "No instance for ..."# of {} +-- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core +isDeferredTypeError = go + where + go (Case scrut _ _ []) = go scrut + go (App fun _) = go fun + go (Cast expr _) = go expr + go (Tick _ expr) = go expr + go (Var v) = v `hasKey` typeErrorIdKey + go _ = False + +mkBottomTerminatingTyMsg :: Id -> SDoc +-- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core +mkBottomTerminatingTyMsg binder + = vcat [ text "Binder of a terminating type is bound to bottom:" + , nest 2 (ppr binder <+> dcolon <+> ppr (idType binder)) + , text "A value of this type is assumed never to be bottom," + , text "so GHC may evaluate this binding without being asked to." ] + mkKindErrMsg :: TyVar -> Type -> SDoc mkKindErrMsg tyvar arg_ty = vcat [text "Kinds don't match in type application:", ===================================== compiler/GHC/Core/Opt/WorkWrap/Utils.hs ===================================== @@ -1326,8 +1326,8 @@ fragile Note [Don't make fillers for terminating types] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We never make an absent filler, error thunk or rubbish literal, for a terminating -type (isTerminatingType): a non-unary class dictionary, a boxed equality, or a -constraint tuple. +type (isTerminatingType): a non-unary class dictionary, a unary class dictionary +that wraps a non-unary class dictionary, a boxed equality, or a constraint tuple. GHC relies on a dictionary value never being bottom (see Note [NON-BOTTOM-DICTS invariant] in GHC.Core). GHC uses "speculation" to @@ -1338,6 +1338,7 @@ rise to a succession of bugs including: * #24934: we evaluated an absent dictionary * #25924: we selected a superclass from an absent dictionary + * #27627: we selected a superclass from an absent dictionary of a unary class A terminating type is exactly what speculation will force: see Note [exprOkForSpeculation and type classes] in GHC.Core.Utils. So we refuse to ===================================== compiler/GHC/Core/TyCon.hs ===================================== @@ -1503,8 +1503,15 @@ There are a number of wrinkles Rather, it has its own AlgTyConRhs, namely `UnaryClassTyCon` (UCM3) Unlike non-unary classes, a value of type (C ty), where `C` is a unary - class, might be bottom, because it is represented by the method type alone. - See GHC.Core.Type.isTerminatingType. + class, might be bottom, because it is represented by its single field alone. + It is bottom exactly when a value of that field's type can be bottom, so + GHC.Core.Type.isTerminatingType looks through unary classes to decide. For + + class Eq a => C2 a -- Field: an (Eq a) dictionary + class D a where { meth :: a -> a } -- Field: a function + + a (C2 a) dictionary cannot be bottom but a (D a) dictionary can. + See Note [NON-BOTTOM-DICTS invariant] in GHC.Core. Similarly in exprOkForSpeculation/exprOkToDiscard/exprOkForSpecEval, in GHC.Core.Utils. In the utility funcion `app_ok` we need a special ===================================== compiler/GHC/Core/Type.hs ===================================== @@ -133,6 +133,7 @@ module GHC.Core.Type ( definitelyLiftedType, definitelyUnliftedType, isAlgType, isDataFamilyApp, isSatTyFamApp, isPrimitiveType, isStrictType, isTerminatingType, + unwrapUnaryClasses, isLevityTy, isLevityVar, isRuntimeRepTy, isRuntimeRepVar, isRuntimeRepKindedTy, dropRuntimeRepArgs, @@ -235,8 +236,11 @@ import GHC.Types.Var.Env import GHC.Types.Var.Set import GHC.Core.TyCon +import GHC.Core.TyCon.Set( TyConSet, emptyTyConSet, elemTyConSet, extendTyConSet ) import GHC.Builtin.Types.Prim +import {-# SOURCE #-} GHC.Core.DataCon( dataConInstArgTys ) + import {-# SOURCE #-} GHC.Builtin.Types ( charTy, naturalTy , typeSymbolKind, liftedTypeKind, unliftedTypeKind @@ -2460,12 +2464,50 @@ isTerminatingType :: HasDebugCallStack => Type -> Bool -- Note [NON-BOTTOM-DICTS invariant] in GHC.Core -- NB: unlifted types are not terminating types! -- e.g. you can write a term (loop 1)::Int# that diverges. -isTerminatingType ty = case tyConAppTyCon_maybe ty of +isTerminatingType ty = case tyConAppTyCon_maybe (unwrapUnaryClasses id ty) of Just tc -> isClassTyCon tc && not (isUnaryClassTyCon tc) - -- A non-unary class TyCon is terminating - -- See (UCM3) in Note [Unary class magic] in GHC.Core.TyCon + -- We ask about the type that represents the dictionary, not the + -- type we were handed, because a unary class dictionary **is** the + -- field it wraps. A non-unary class TyCon is terminating; a + -- unary one is left here only when there is a cylce, + -- and then the dictionary really can be bottom. + -- See (1) and (3) in Note [NON-BOTTOM-DICTS invariant] in + -- GHC.Core, and (UCM3) in Note [Unary class magic] _ -> False +-- | Look through unary classes, and return the first type +-- that is not a unary class. For +-- +-- class Eq a => C2 a -- Unary +-- class D a where { meth :: a -> a } -- Unary +-- class Eq a => C1 a where { op :: a -> a } -- Not unary +-- +-- this returns (Eq a) for (C2 a), (a -> a) for (D a), and (C1 a) unchanged. +-- +-- With UndecidableSuperClasses we can have a cycle: +-- +-- class D2 a => D1 a +-- class D1 a => D2 a +-- +-- so we stop and return when we detect a cycle. +-- See Note [Unary class magic] in GHC.Core.TyCon +unwrapUnaryClasses :: (Type -> Type) -- ^ Normalise a type before each step. + -- Pass 'id' to leave it alone, or + -- 'GHC.Types.RepType.unwrapType' to see + -- through newtypes, casts and foralls + -> Type -> Type +unwrapUnaryClasses norm = go emptyTyConSet + where + go :: TyConSet -> Type -> Type + go seen ty + | Just (tc, tys) <- splitTyConApp_maybe (norm ty) + , Just (_cls, dict_con) <- isUnaryClassTyCon_maybe tc + , [fld_ty] <- map scaledThing (dataConInstArgTys dict_con tys) + , not (tc `elemTyConSet` seen) + = go (seen `extendTyConSet` tc) fld_ty + | otherwise + = ty + isPrimitiveType :: Type -> Bool -- ^ Returns true of types that are opaque to Haskell. isPrimitiveType ty = case splitTyConApp_maybe ty of ===================================== compiler/GHC/Core/Utils.hs ===================================== @@ -2383,8 +2383,10 @@ a) That the function is a class-op, with IdDetails of ClassOpId b) That the result type of the class-op is terminating or unlifted. E.g. for class C a => D a where ... class C a where { op :: a -> a } - Since C is represented by a newtype, (sc_sel (d :: D a)) might - not be terminating. + C is a unary class whose one field is the method `op`, so a (C a) dictionary + **is** that function and can be bottom. Hence + (sc_sel (d :: D a)) might not be terminating. + See (1) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core. Rather than repeatedly test if the result of the class-op is a terminating/unlifted type, we cache it as a field of ClassOpId. See ===================================== compiler/GHC/Types/RepType.hs ===================================== @@ -32,7 +32,6 @@ import GHC.Types.Basic (Arity, RepArity) import GHC.Core.DataCon import GHC.Core.Coercion import GHC.Core.TyCon -import GHC.Core.TyCon.Set import GHC.Core.TyCon.RecWalk import GHC.Core.TyCo.Rep import GHC.Core.Type @@ -734,26 +733,13 @@ mightBeFunTy ty -- definitely not a function type. | definitelyUnliftedType ty = False - | Just tc <- tyConAppTyCon_maybe (unwrap_type ty) + -- Use 'unwrapType' to look through casts, newtypes and foralls, and + -- 'unwrapUnaryClasses' to look through unary classes (which are transparent + -- as per Note [Unary class magic] in GHC.Core.TyCon). We don't try to + -- reduce type family applications, as we don't have a FamInstEnv to hand. + | Just tc <- tyConAppTyCon_maybe (unwrapUnaryClasses unwrapType ty) -- A proper datatype (such as 'Int' or 'Maybe Bool') is definitely not -- a function type. (This does not include newtypes nor type families.) = not $ isBoxedDataTyCon tc | otherwise = True - - where - -- Use 'unwrapType' to look through casts, newtypes and foralls. - -- Separately, look through unary classes (supposed to be transparent as per - -- Note [Unary class magic] in GHC.Core.TyCon). We don't try to reduce type - -- family applications, as we don't have a FamInstEnv to hand. - unwrap_type = go emptyTyConSet - where - go seen_tcs ty - | Just (tc, tys) <- splitTyConApp_maybe (unwrapType ty) - , Just (_cls, unary_dc) <- isUnaryClassTyCon_maybe tc - , [inst_meth_ty] <- map scaledThing (dataConInstArgTys unary_dc tys) - = if tc `elemTyConSet` seen_tcs - then ty -- cycle detected: bail out - else go (seen_tcs `extendTyConSet` tc) inst_meth_ty - | otherwise - = ty ===================================== testsuite/tests/core-to-stg/T27627/Callee.hs ===================================== @@ -0,0 +1,34 @@ +{-# LANGUAGE GADTs, ConstraintKinds, ScopedTypeVariables #-} +{-# OPTIONS_GHC -fno-worker-wrapper #-} +module Callee where + +-- TC is not unary: it has a superclass field and a method field. So $p1TC is +-- an ordinary selector, ($p1TC d) is not a trivial expression, and CorePrep +-- gives it a binding of its own. +class Eq a => TC a where + tcDummy :: a -> Int + +-- UC is unary: a single superclass field. Its dictionary is precisely the +-- (TC a) dictionary it wraps, so it cannot be bottom either. +class TC a => UC a where {} + +instance TC Int where tcDummy _ = 0 +instance UC Int + +data Dict c where + Dict :: c => Dict c + +-- Ignores its argument, so the Dict below is absent-demanded, and hence so is +-- the UC dictionary that Dict carries. +{-# NOINLINE discard #-} +discard :: Dict c -> Int +discard _ = 42 + +-- The Core of the body is +-- discard (Dict @(Eq a) ($p1TC ($p1UC d))) +-- The constructor application is a value, so CorePrep floats the selection +-- out of the argument and evaluates it at the head of b. -fno-worker-wrapper +-- keeps the dictionary parameter, so the caller has to pass one. +{-# NOINLINE b #-} +b :: forall a. UC a => a -> Int +b _ = discard (Dict :: Dict (Eq a)) ===================================== testsuite/tests/core-to-stg/T27627/Caller.hs ===================================== @@ -0,0 +1,11 @@ +module Caller where + +import Callee + +-- b does not use its dictionary, so a's dictionary is absent. Worker/wrapper +-- used to drop it and pass an error thunk to b in its place, which b then +-- evaluated. Now isTerminatingType looks through the unary class UC, sees the +-- (TC a) dictionary underneath, and refuses to make a filler. +{-# NOINLINE a #-} +a :: UC t => t -> Int +a x = b x + 1 ===================================== testsuite/tests/core-to-stg/T27627/Main.hs ===================================== @@ -0,0 +1,4 @@ +module Main where +import Caller +main :: IO () +main = print (a (1 :: Int)) ===================================== testsuite/tests/core-to-stg/T27627/T27627.stdout ===================================== @@ -0,0 +1 @@ +43 ===================================== testsuite/tests/core-to-stg/T27627/all.T ===================================== @@ -0,0 +1,4 @@ +test('T27627', + [extra_files(['Main.hs', 'Caller.hs', 'Callee.hs'])], + multimod_compile_and_run, + ['Main', '-O']) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5d8c22799b5de5296a12df78cb02b19… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5d8c22799b5de5296a12df78cb02b19… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/27627] Make isTerminatingType look through unary classes
by Zubin (＠wz1000) 14 Aug '26

14 Aug '26

Zubin pushed to branch wip/27627 at Glasgow Haskell Compiler / GHC Commits: 9032bd3d by Zubin Duggal at 2026-08-14T14:07:49+05:30 Make isTerminatingType look through unary classes A unary class is represented by its field, so it can be bottom precisely when its field can be bottom. Also add a core lint check to ensure there are no bindings whose type is `isTerminatingType` but their rhs is bottom Fixes #27627 - - - - - 14 changed files: - + changelog.d/27627 - compiler/GHC/Core.hs - compiler/GHC/Core/DataCon.hs-boot - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/Types/RepType.hs - + testsuite/tests/core-to-stg/T27627/Callee.hs - + testsuite/tests/core-to-stg/T27627/Caller.hs - + testsuite/tests/core-to-stg/T27627/Main.hs - + testsuite/tests/core-to-stg/T27627/T27627.stdout - + testsuite/tests/core-to-stg/T27627/all.T Changes: ===================================== changelog.d/27627 ===================================== @@ -0,0 +1,5 @@ +section: compiler +synopsis: Fix a bug where an absent dictionary argument of a unary class could + be replaced by an error thunk, which GHC then evaluated, crashing the program. +mrs: +issues: #27627 ===================================== compiler/GHC/Core.hs ===================================== @@ -644,21 +644,20 @@ parts of the compilation pipeline. Note [NON-BOTTOM-DICTS invariant] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -It is a global invariant (not checkable by Lint) that +It is a global invariant that - every non-newtype dictionary-typed expression is non-bottom. + a dictionary-typed expression is never bottom, -These conditions are captured by GHC.Core.Type.isTerminatingType. +The exception is unary classes; see (1) below. +GHC.Core.Type.isTerminatingType says which types the invariant covers. -How are we so sure about this? Dictionaries are built by GHC in only two ways: +How are we so sure about this? GHC builds a dictionary in only two ways: * A dictionary function (DFun), arising from an instance declaration. DFuns do no computation: they always return a data constructor immediately. See DFunUnfolding in GHC.Core. So the result of a call to a DFun is always non-bottom. - Exception: newtype dictionaries. - Plus: see the Very Nasty Wrinkle in Note [Speculative evaluation] in GHC.CoreToStg.Prep @@ -666,20 +665,89 @@ How are we so sure about this? Dictionaries are built by GHC in only two ways: see Note [Recursive superclasses] and Note [Solving superclass constraints] in GHC.Tc.TyCl.Instance. -A bad Core-to-Core pass could invalidate this reasoning, but that's too bad. -It's still an invariant of Core programs generated by GHC from Haskell, and -Core-to-Core passes maintain it. +(1) Unary classes + +The dictionary of a unary class is not a data constructor application at all: +it *is* its single field. See Note [Unary class magic] in GHC.Core.TyCon. +So for + + class Eq a => C1 a where { op :: a -> a } -- Two fields: not unary + class Eq a => C2 a -- One field: unary + class D a where { meth :: a -> a } -- One field: unary + +a (C1 a) dictionary is a data constructor application, so it cannot be bottom. +A (C2 a) dictionary is precisely the (Eq a) dictionary it wraps, which cannot +be bottom either. But a (D a) dictionary is precisely the function `meth`, and +the programmer can write + + instance D Int where meth = undefined + +so it can perfectly well bottom. + +`isTerminatingType` therefore looks through unary classes, one field at a time, +until it reaches a type that is not a unary class: + + isTerminatingType (C1 a) = True -- Stops at once: C1 is not unary + isTerminatingType (C2 a) = True -- Looks through C2, reaches (Eq a) + isTerminatingType (D a) = False -- Looks through D, reaches (a -> a) + +(2) Two kinds of callers, pulling in opposite directions + +Some code __relies__ on a dictionary being non-bottom, and evaluates one eagerly +on the basis of that: + + * -fdicts-strict makes dictionary arguments strict. + See GHC.Types.Demand.strictifyDictDmd + + * exprOkForSpeculation says that (eq_sel d) terminates, so that + case (eq_sel d) of _ -> blah + can be discarded (exprOkToDiscard), or evaluated ahead of time. See + Note [exprOkForSpeculation and type classes] in GHC.Core.Utils and + Note [Speculative evaluation] in GHC.CoreToStg.Prep + +Other code would otherwise __create__ a bottom value at a dictionary type, and +it must not: + + * Worker/wrapper replaces an absent argument with an error thunk or a + rubbish literal. See Note [Don't make fillers for terminating types] + in GHC.Core.Opt.WorkWrap.Utils + +isTerminatingType is the condition used by both, so we the latter +kind of caller doesn't put bottoms in places where the former kind of +caller requires them to be absent. + +The result of `isTerminatingType` depnds only on the type at the end of the +chain of fields, so `isTerminatingType` returns the same thing for a unary class +and its field: if it says False for (C2 a) then it also says False for (Eq a). +#27627 is an example of how we got it wrong before. `isTerminatingType` used +to stop at the unary class C2 rather than look through it, so worker/wrapper +made an error thunk for a (C2 a) dictionary, while exprOkForSpeculation +evaluated that very same value as a (Eq a) dictionary. + +(3) Cyclic superclasses + +With UndecidableSuperClasses the chain of fields can loop back on itself: + + class D2 a => D1 a + class D1 a => D2 a + +`isTerminatingType` returns false as soon as it detects a cycle + +(4) Keeping the invariant true + +We can check the invariant in core lint: `lintLetBind` rejects a binding +whose type is terminating and whose right hand side is bottom. It checks +bindings only, which is where the absent-filler machinery of worker/wrapper and +Specialise puts such values. -Why is it useful to know that dictionaries are non-bottom? +However, there is a complication. With -fdefer-type-errors (and +-fdefer-typed-holes, and friends) GHC binds a dictionary it could not solve to +`typeError`, which is bottom: -1. It justifies the use of `-XDictsStrict`; - see `GHC.Core.Types.Demand.strictifyDictDmd` + $dEq :: Eq T + $dEq = case typeError "No instance for (Eq T) ..."# of {} -2. It means that (eq_sel d) is ok-for-speculation and thus - case (eq_sel d) of _ -> blah - can be discarded by the Simplifier. See these Notes: - Note [exprOkForSpeculation and type classes] in GHC.Core.Utils - Note[Speculative evaluation] in GHC.CoreToStg.Prep +`GHC.Core.Lint.isDeferredTypeError` handles this. Note [Case expression invariants] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ===================================== compiler/GHC/Core/DataCon.hs-boot ===================================== @@ -22,6 +22,7 @@ dataConUserTyVars :: DataCon -> [TyVar] dataConUserTyVarBinders :: DataCon -> [TyVarBinder] dataConSourceArity :: DataCon -> Arity dataConFieldLabels :: DataCon -> [FieldLabel] +dataConInstArgTys :: DataCon -> [Type] -> [Scaled Type] dataConInstOrigArgTys :: DataCon -> [Type] -> [Scaled Type] dataConStupidTheta :: DataCon -> ThetaType dataConFullSig :: DataCon ===================================== compiler/GHC/Core/Lint.hs ===================================== @@ -563,6 +563,15 @@ lintLetBind top_lvl rec_flag binder rhs rhs_ty || exprIsTickedString rhs) (mkTopNonLitStrMsg binder) + -- Check that we have not bound bottom at a type whose values are + -- assumed to be non-bottom, such as a dictionary. (See #24934, #25924, #27627). + -- A deferred type error is an exception. + -- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core + ; checkL (not (isTerminatingType binder_ty) + || not (exprIsDeadEnd rhs) + || isDeferredTypeError rhs) + (mkBottomTerminatingTyMsg binder) + ; flags <- getLintFlags -- Check that a join-point binder has a valid type @@ -3814,6 +3823,28 @@ mkTopNonLitStrMsg :: Id -> SDoc mkTopNonLitStrMsg binder = hsep [text "Top-level Addr# binder has a non-literal rhs:", ppr binder] +isDeferredTypeError :: CoreExpr -> Bool +-- ^ True if it contains a call to `typeError` like -fdefer-type-errors and its +-- relatives insert, such as +-- case typeError @LiftedRep @() "No instance for ..."# of {} +-- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core +isDeferredTypeError = go + where + go (Case scrut _ _ []) = go scrut + go (App fun _) = go fun + go (Cast expr _) = go expr + go (Tick _ expr) = go expr + go (Var v) = v `hasKey` typeErrorIdKey + go _ = False + +mkBottomTerminatingTyMsg :: Id -> SDoc +-- See (4) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core +mkBottomTerminatingTyMsg binder + = vcat [ text "Binder of a terminating type is bound to bottom:" + , nest 2 (ppr binder <+> dcolon <+> ppr (idType binder)) + , text "A value of this type is assumed never to be bottom," + , text "so GHC may evaluate this binding without being asked to." ] + mkKindErrMsg :: TyVar -> Type -> SDoc mkKindErrMsg tyvar arg_ty = vcat [text "Kinds don't match in type application:", ===================================== compiler/GHC/Core/Opt/WorkWrap/Utils.hs ===================================== @@ -1326,8 +1326,8 @@ fragile Note [Don't make fillers for terminating types] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We never make an absent filler, error thunk or rubbish literal, for a terminating -type (isTerminatingType): a non-unary class dictionary, a boxed equality, or a -constraint tuple. +type (isTerminatingType): a non-unary class dictionary, a unary class dictionary +that wraps a non-unary class dictionary, a boxed equality, or a constraint tuple. GHC relies on a dictionary value never being bottom (see Note [NON-BOTTOM-DICTS invariant] in GHC.Core). GHC uses "speculation" to @@ -1338,6 +1338,7 @@ rise to a succession of bugs including: * #24934: we evaluated an absent dictionary * #25924: we selected a superclass from an absent dictionary + * #27627: we selected a superclass from an absent dictionary of a unary class A terminating type is exactly what speculation will force: see Note [exprOkForSpeculation and type classes] in GHC.Core.Utils. So we refuse to ===================================== compiler/GHC/Core/TyCon.hs ===================================== @@ -1503,8 +1503,15 @@ There are a number of wrinkles Rather, it has its own AlgTyConRhs, namely `UnaryClassTyCon` (UCM3) Unlike non-unary classes, a value of type (C ty), where `C` is a unary - class, might be bottom, because it is represented by the method type alone. - See GHC.Core.Type.isTerminatingType. + class, might be bottom, because it is represented by its single field alone. + It is bottom exactly when a value of that field's type can be bottom, so + GHC.Core.Type.isTerminatingType looks through unary classes to decide. For + + class Eq a => C2 a -- Field: an (Eq a) dictionary + class D a where { meth :: a -> a } -- Field: a function + + a (C2 a) dictionary cannot be bottom but a (D a) dictionary can. + See Note [NON-BOTTOM-DICTS invariant] in GHC.Core. Similarly in exprOkForSpeculation/exprOkToDiscard/exprOkForSpecEval, in GHC.Core.Utils. In the utility funcion `app_ok` we need a special ===================================== compiler/GHC/Core/Type.hs ===================================== @@ -133,6 +133,7 @@ module GHC.Core.Type ( definitelyLiftedType, definitelyUnliftedType, isAlgType, isDataFamilyApp, isSatTyFamApp, isPrimitiveType, isStrictType, isTerminatingType, + unwrapUnaryClasses, isLevityTy, isLevityVar, isRuntimeRepTy, isRuntimeRepVar, isRuntimeRepKindedTy, dropRuntimeRepArgs, @@ -235,8 +236,11 @@ import GHC.Types.Var.Env import GHC.Types.Var.Set import GHC.Core.TyCon +import GHC.Core.TyCon.Set( TyConSet, emptyTyConSet, elemTyConSet, extendTyConSet ) import GHC.Builtin.Types.Prim +import {-# SOURCE #-} GHC.Core.DataCon( dataConInstArgTys ) + import {-# SOURCE #-} GHC.Builtin.Types ( charTy, naturalTy , typeSymbolKind, liftedTypeKind, unliftedTypeKind @@ -2460,12 +2464,50 @@ isTerminatingType :: HasDebugCallStack => Type -> Bool -- Note [NON-BOTTOM-DICTS invariant] in GHC.Core -- NB: unlifted types are not terminating types! -- e.g. you can write a term (loop 1)::Int# that diverges. -isTerminatingType ty = case tyConAppTyCon_maybe ty of +isTerminatingType ty = case tyConAppTyCon_maybe (unwrapUnaryClasses id ty) of Just tc -> isClassTyCon tc && not (isUnaryClassTyCon tc) - -- A non-unary class TyCon is terminating - -- See (UCM3) in Note [Unary class magic] in GHC.Core.TyCon + -- We ask about the type that represents the dictionary, not the + -- type we were handed, because a unary class dictionary **is** the + -- field it wraps. A non-unary class TyCon is terminating; a + -- unary one is left here only when there is a cylce, + -- and then the dictionary really can be bottom. + -- See (1) and (3) in Note [NON-BOTTOM-DICTS invariant] in + -- GHC.Core, and (UCM3) in Note [Unary class magic] _ -> False +-- | Look through unary classes, and return the first type +-- that is not a unary class. For +-- +-- class Eq a => C2 a -- Unary +-- class D a where { meth :: a -> a } -- Unary +-- class Eq a => C1 a where { op :: a -> a } -- Not unary +-- +-- this returns (Eq a) for (C2 a), (a -> a) for (D a), and (C1 a) unchanged. +-- +-- With UndecidableSuperClasses we can have a cycle: +-- +-- class D2 a => D1 a +-- class D1 a => D2 a +-- +-- so we stop and return when we detect a cycle. +-- See Note [Unary class magic] in GHC.Core.TyCon +unwrapUnaryClasses :: (Type -> Type) -- ^ Normalise a type before each step. + -- Pass 'id' to leave it alone, or + -- 'GHC.Types.RepType.unwrapType' to see + -- through newtypes, casts and foralls + -> Type -> Type +unwrapUnaryClasses norm = go emptyTyConSet + where + go :: TyConSet -> Type -> Type + go seen ty + | Just (tc, tys) <- splitTyConApp_maybe (norm ty) + , Just (_cls, dict_con) <- isUnaryClassTyCon_maybe tc + , [fld_ty] <- map scaledThing (dataConInstArgTys dict_con tys) + , not (tc `elemTyConSet` seen) + = go (seen `extendTyConSet` tc) fld_ty + | otherwise + = ty + isPrimitiveType :: Type -> Bool -- ^ Returns true of types that are opaque to Haskell. isPrimitiveType ty = case splitTyConApp_maybe ty of ===================================== compiler/GHC/Core/Utils.hs ===================================== @@ -2383,8 +2383,10 @@ a) That the function is a class-op, with IdDetails of ClassOpId b) That the result type of the class-op is terminating or unlifted. E.g. for class C a => D a where ... class C a where { op :: a -> a } - Since C is represented by a newtype, (sc_sel (d :: D a)) might - not be terminating. + C is a unary class whose one field is the method `op`, so a (C a) dictionary + **is** that function and can be bottom. Hence + (sc_sel (d :: D a)) might not be terminating. + See (1) in Note [NON-BOTTOM-DICTS invariant] in GHC.Core. Rather than repeatedly test if the result of the class-op is a terminating/unlifted type, we cache it as a field of ClassOpId. See ===================================== compiler/GHC/Types/RepType.hs ===================================== @@ -32,7 +32,6 @@ import GHC.Types.Basic (Arity, RepArity) import GHC.Core.DataCon import GHC.Core.Coercion import GHC.Core.TyCon -import GHC.Core.TyCon.Set import GHC.Core.TyCon.RecWalk import GHC.Core.TyCo.Rep import GHC.Core.Type @@ -734,26 +733,13 @@ mightBeFunTy ty -- definitely not a function type. | definitelyUnliftedType ty = False - | Just tc <- tyConAppTyCon_maybe (unwrap_type ty) + -- Use 'unwrapType' to look through casts, newtypes and foralls, and + -- 'unwrapUnaryClasses' to look through unary classes (which are transparent + -- as per Note [Unary class magic] in GHC.Core.TyCon). We don't try to + -- reduce type family applications, as we don't have a FamInstEnv to hand. + | Just tc <- tyConAppTyCon_maybe (unwrapUnaryClasses unwrapType ty) -- A proper datatype (such as 'Int' or 'Maybe Bool') is definitely not -- a function type. (This does not include newtypes nor type families.) = not $ isBoxedDataTyCon tc | otherwise = True - - where - -- Use 'unwrapType' to look through casts, newtypes and foralls. - -- Separately, look through unary classes (supposed to be transparent as per - -- Note [Unary class magic] in GHC.Core.TyCon). We don't try to reduce type - -- family applications, as we don't have a FamInstEnv to hand. - unwrap_type = go emptyTyConSet - where - go seen_tcs ty - | Just (tc, tys) <- splitTyConApp_maybe (unwrapType ty) - , Just (_cls, unary_dc) <- isUnaryClassTyCon_maybe tc - , [inst_meth_ty] <- map scaledThing (dataConInstArgTys unary_dc tys) - = if tc `elemTyConSet` seen_tcs - then ty -- cycle detected: bail out - else go (seen_tcs `extendTyConSet` tc) inst_meth_ty - | otherwise - = ty ===================================== testsuite/tests/core-to-stg/T27627/Callee.hs ===================================== @@ -0,0 +1,34 @@ +{-# LANGUAGE GADTs, ConstraintKinds, ScopedTypeVariables #-} +{-# OPTIONS_GHC -fno-worker-wrapper #-} +module Callee where + +-- TC is not unary: it has a superclass field and a method field. So $p1TC is +-- an ordinary selector, ($p1TC d) is not a trivial expression, and CorePrep +-- gives it a binding of its own. +class Eq a => TC a where + tcDummy :: a -> Int + +-- UC is unary: a single superclass field. Its dictionary is precisely the +-- (TC a) dictionary it wraps, so it cannot be bottom either. +class TC a => UC a where {} + +instance TC Int where tcDummy _ = 0 +instance UC Int + +data Dict c where + Dict :: c => Dict c + +-- Ignores its argument, so the Dict below is absent-demanded, and hence so is +-- the UC dictionary that Dict carries. +{-# NOINLINE discard #-} +discard :: Dict c -> Int +discard _ = 42 + +-- The Core of the body is +-- discard (Dict @(Eq a) ($p1TC ($p1UC d))) +-- The constructor application is a value, so CorePrep floats the selection +-- out of the argument and evaluates it at the head of b. -fno-worker-wrapper +-- keeps the dictionary parameter, so the caller has to pass one. +{-# NOINLINE b #-} +b :: forall a. UC a => a -> Int +b _ = discard (Dict :: Dict (Eq a)) ===================================== testsuite/tests/core-to-stg/T27627/Caller.hs ===================================== @@ -0,0 +1,11 @@ +module Caller where + +import Callee + +-- b does not use its dictionary, so a's dictionary is absent. Worker/wrapper +-- used to drop it and pass an error thunk to b in its place, which b then +-- evaluated. Now isTerminatingType looks through the unary class UC, sees the +-- (TC a) dictionary underneath, and refuses to make a filler. +{-# NOINLINE a #-} +a :: UC t => t -> Int +a x = b x + 1 ===================================== testsuite/tests/core-to-stg/T27627/Main.hs ===================================== @@ -0,0 +1,4 @@ +module Main where +import Caller +main :: IO () +main = print (a (1 :: Int)) ===================================== testsuite/tests/core-to-stg/T27627/T27627.stdout ===================================== @@ -0,0 +1 @@ +43 ===================================== testsuite/tests/core-to-stg/T27627/all.T ===================================== @@ -0,0 +1,4 @@ +test('T27627', + [extra_files(['Main.hs', 'Caller.hs', 'Callee.hs'])], + multimod_compile_and_run, + ['Main', '-O']) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/9032bd3d692e4593dd8410940ff54ca… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/9032bd3d692e4593dd8410940ff54ca… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/27626] 6 commits: Allow rewriting in RuntimeReps for newtype ConPats
by Zubin (＠wz1000) 14 Aug '26

14 Aug '26

Zubin pushed to branch wip/27626 at Glasgow Haskell Compiler / GHC Commits: 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(a)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 - - - - - def563ee by Zubin Duggal at 2026-08-14T14:02:58+05:30 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 - - - - - 55 changed files: - + changelog.d/27626 - + changelog.d/T20363 - changelog.d/fix-heap-census-large-arrays-19048 - compiler/GHC/Hs/Pat.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Match/Constructor.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Types/Demand.hs - compiler/GHC/Types/Id/Make.hs - docs/index.html.in - docs/users_guide/ghc_config.py.in - docs/users_guide/separate_compilation.rst - docs/users_guide/using.rst - hadrian/src/Rules/Generate.hs - rts/LdvProfile.c - rts/PrimOps.cmm - rts/Printer.c - rts/ProfHeap.c - rts/include/rts/storage/ClosureMacros.h - rts/sm/Sanity.c - rts/sm/Storage.c - testsuite/tests/corelint/T21115b.stderr - testsuite/tests/dmdanal/should_compile/T23398.stderr - + testsuite/tests/dmdanal/should_run/M2.hs - + testsuite/tests/dmdanal/should_run/T27626.hs - + testsuite/tests/dmdanal/should_run/T27626.stdout - testsuite/tests/dmdanal/should_run/all.T - testsuite/tests/numeric/should_compile/T23907.stderr - testsuite/tests/perf/compiler/all.T - testsuite/tests/rep-poly/RepPolyRecordPattern.hs - testsuite/tests/rep-poly/RepPolyRecordPattern.stderr - testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr - testsuite/tests/rep-poly/T20113.stderr - − testsuite/tests/rep-poly/T20363.stderr - − testsuite/tests/rep-poly/T20363_show_co.hs - − testsuite/tests/rep-poly/T20363_show_co.stderr - − testsuite/tests/rep-poly/T20363b.stderr - + testsuite/tests/rep-poly/T20363c.hs - testsuite/tests/rep-poly/all.T - + testsuite/tests/rts/T27585.hs - + testsuite/tests/rts/T27585.stdout - testsuite/tests/rts/all.T - testsuite/tests/simplCore/should_compile/T24229a.stderr - testsuite/tests/simplCore/should_compile/T24229b.stderr - testsuite/tests/simplCore/should_compile/T3717.stderr - testsuite/tests/simplCore/should_compile/T3772.stdout - testsuite/tests/simplCore/should_compile/T4081.stderr - testsuite/tests/simplCore/should_compile/T4908.stderr The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/876bc4ee7d8d46e425f0748f9f6419… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/876bc4ee7d8d46e425f0748f9f6419… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/27627] 7 commits: Allow rewriting in RuntimeReps for newtype ConPats
by Zubin (＠wz1000) 14 Aug '26

14 Aug '26

Zubin pushed to branch wip/27627 at Glasgow Haskell Compiler / GHC Commits: 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(a)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 - - - - - def563ee by Zubin Duggal at 2026-08-14T14:02:58+05:30 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 - - - - - 21eb14ab by Zubin Duggal at 2026-08-14T14:02:58+05:30 Make isTerminatingType look through unary classes A unary class is represented by its field, so it can be bottom precisely when its field can be bottom. Also add a core lint check to ensure there are no bindings whose type is `isTerminatingType` but their rhs is bottom Fixes #27627 - - - - - 69 changed files: - + changelog.d/27626 - + changelog.d/27627 - + changelog.d/T20363 - changelog.d/fix-heap-census-large-arrays-19048 - compiler/GHC/Core.hs - compiler/GHC/Core/DataCon.hs-boot - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Match/Constructor.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Types/Demand.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/RepType.hs - docs/index.html.in - docs/users_guide/ghc_config.py.in - docs/users_guide/separate_compilation.rst - docs/users_guide/using.rst - hadrian/src/Rules/Generate.hs - rts/LdvProfile.c - rts/PrimOps.cmm - rts/Printer.c - rts/ProfHeap.c - rts/include/rts/storage/ClosureMacros.h - rts/sm/Sanity.c - rts/sm/Storage.c - + testsuite/tests/core-to-stg/T27627/Callee.hs - + testsuite/tests/core-to-stg/T27627/Caller.hs - + testsuite/tests/core-to-stg/T27627/Main.hs - + testsuite/tests/core-to-stg/T27627/T27627.stdout - + testsuite/tests/core-to-stg/T27627/all.T - testsuite/tests/corelint/T21115b.stderr - testsuite/tests/dmdanal/should_compile/T23398.stderr - + testsuite/tests/dmdanal/should_run/M2.hs - + testsuite/tests/dmdanal/should_run/T27626.hs - + testsuite/tests/dmdanal/should_run/T27626.stdout - testsuite/tests/dmdanal/should_run/all.T - testsuite/tests/numeric/should_compile/T23907.stderr - testsuite/tests/perf/compiler/all.T - testsuite/tests/rep-poly/RepPolyRecordPattern.hs - testsuite/tests/rep-poly/RepPolyRecordPattern.stderr - testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr - testsuite/tests/rep-poly/T20113.stderr - − testsuite/tests/rep-poly/T20363.stderr - − testsuite/tests/rep-poly/T20363_show_co.hs - − testsuite/tests/rep-poly/T20363_show_co.stderr - − testsuite/tests/rep-poly/T20363b.stderr - + testsuite/tests/rep-poly/T20363c.hs - testsuite/tests/rep-poly/all.T - + testsuite/tests/rts/T27585.hs - + testsuite/tests/rts/T27585.stdout - testsuite/tests/rts/all.T - testsuite/tests/simplCore/should_compile/T24229a.stderr - testsuite/tests/simplCore/should_compile/T24229b.stderr - testsuite/tests/simplCore/should_compile/T3717.stderr - testsuite/tests/simplCore/should_compile/T3772.stdout - testsuite/tests/simplCore/should_compile/T4081.stderr - testsuite/tests/simplCore/should_compile/T4908.stderr The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/79520a512bcbd8d10aadf63e853263… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/79520a512bcbd8d10aadf63e853263… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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