Ben Gamari pushed to branch wip/T25989 at Glasgow Haskell Compiler / GHC Commits: b96e2f77 by Sylvain Henry at 2025-04-18T20:46:33-04:00 RTS: remove target info and fix host info (#24058) The RTS isn't a compiler, hence it doesn't have a target and we remove the reported target info displayed by "+RTS --info". We also fix the host info displayed by "+RTS --info": the host of the RTS is the RTS-building compiler's target, not the compiler's host (wrong when doing cross-compilation). - - - - - 6d9965f4 by Sylvain Henry at 2025-04-18T20:46:33-04:00 RTS: remove build info As per the discussion in !13967, there is no reason to tag the RTS with information about the build platform. - - - - - d52e9b3f by Vladislav Zavialov at 2025-04-18T20:47:15-04:00 Diagnostics: remove the KindMismatch constructor (#25957) The KindMismatch constructor was only used as an intermediate representation in pretty-printing. Its removal addresses a problem detected by the "codes" test case: [GHC-89223] is untested (constructor = KindMismatch) In a concious deviation from the usual procedure, the error code GHC-89223 is removed entirely rather than marked as Outdated. The reason is that it never was user-facing in the first place. - - - - - e2f2f9d0 by Vladislav Zavialov at 2025-04-20T10:53:39-04:00 Add name for -Wunusable-unpack-pragmas This warning had no name or flag and was triggered unconditionally. Now it is part of -Wdefault. In GHC.Tc.TyCl.tcTyClGroupsPass's strict mode, we now have to force-enable this warning to ensure that detection of flawed groups continues to work even if the user disables the warning with the -Wno-unusable-unpack-pragmas option. Test case: T3990c Also, the misnamed BackpackUnpackAbstractType is now called UnusableUnpackPragma. - - - - - 6caa6508 by Adam Gundry at 2025-04-20T10:54:22-04:00 Fix specialisation of incoherent instances (fixes #25883) GHC normally assumes that class constraints are canonical, meaning that the specialiser is allowed to replace one dictionary argument with another provided that they have the same type. The `-fno-specialise-incoherents` flag alters INCOHERENT instance definitions so that they will prevent specialisation in some cases, by inserting `nospec`. This commit fixes a bug in 7124e4ad76d98f1fc246ada4fd7bf64413ff2f2e, which treated some INCOHERENT instance matches as if `-fno-specialise-incoherents` was in effect, thereby unnecessarily preventing specialisation. In addition it updates the relevant `Note [Rules for instance lookup]` and adds a new `Note [Canonicity for incoherent matches]`. - - - - - 0426fd6c by Adam Gundry at 2025-04-20T10:54:23-04:00 Add regression test for #23429 - - - - - eec96527 by Adam Gundry at 2025-04-20T10:54:23-04:00 user's guide: update specification of overlapping/incoherent instances The description of the instance resolution algorithm in the user's guide was slightly out of date, because it mentioned in-scope given constraints only at the end, whereas the implementation checks for their presence before any of the other steps. This also adds a warning to the user's guide about the impact of incoherent instances on specialisation, and more clearly documents some of the other effects of `-XIncoherentInstances`. - - - - - a00eeaec by Matthew Craven at 2025-04-20T10:55:03-04:00 Fix bytecode generation for `tagToEnum# <LITERAL>` Fixes #25975. - - - - - 2e204269 by Andreas Klebinger at 2025-04-22T12:20:41+02:00 Simplifier: Constant fold invald tagToEnum# calls to bottom expr. When applying tagToEnum# to a out-of-range value it's best to simply constant fold it to a bottom expression. That potentially allows more dead code elimination and makes debugging easier. Fixes #25976 - - - - - 7250fc0c by Matthew Pickering at 2025-04-22T16:24:04-04:00 Move -fno-code note into Downsweep module This note was left behind when all the code which referred to it was moved into the GHC.Driver.Downsweep module - - - - - d2dc89b4 by Matthew Pickering at 2025-04-22T16:24:04-04:00 Apply editing notes to Note [-fno-code mode] suggested by sheaf These notes were suggested in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14241 - - - - - 91564daf by Matthew Pickering at 2025-04-24T00:29:02-04:00 ghci: Use loadInterfaceForModule rather than loadSrcInterface in mkTopLevEnv loadSrcInterface takes a user given `ModuleName` and resolves it to the module which needs to be loaded (taking into account module renaming/visibility etc). loadInterfaceForModule takes a specific module and loads it. The modules in `ImpDeclSpec` have already been resolved to the actual module to get the information from during renaming. Therefore we just need to fetch the precise interface from disk (and not attempt to rename it again). Fixes #25951 - - - - - 2e0c07ab by Simon Peyton Jones at 2025-04-24T00:29:43-04:00 Test for #23298 - - - - - 0eef99b0 by Sven Tennie at 2025-04-24T07:34:36-04:00 RV64: Introduce J instruction (non-local jumps) and don't deallocate stack slots for J_TBL (#25738) J_TBL result in local jumps, there should not deallocate stack slots (see Note [extra spill slots].) J is for non-local jumps, these may need to deallocate stack slots. - - - - - 1bd3d13e by fendor at 2025-04-24T07:35:17-04:00 Add `UnitId` to `EvalBreakpoint` The `EvalBreakpoint` is used to communicate that a breakpoint was encountered during code evaluation. This `EvalBreakpoint` needs to be converted to an `InternalBreakpointId` which stores a `Module` to uniquely find the correct `Module` in the Home Package Table. The `EvalBreakpoint` used to store only a `ModuleName` which is then converted to a `Module` based on the currently active home unit. This is incorrect in the face of multiple home units, the break point could be in an entirely other home unit! To fix this, we additionally store the `UnitId` of the `Module` in `EvalBreakpoint` to later reconstruct the correct `Module` All of the changes are the consequence of extending `EvalBreakpoint` with the additional `ShortByteString` of the `UnitId`. For performance reasons, we store the `ShortByteString` backing the `UnitId` directly, avoiding marshalling overhead. - - - - - fe6ed8d9 by Sylvain Henry at 2025-04-24T18:04:12-04:00 Doc: add doc for JS interruptible calling convention (#24444) - - - - - 6111c5e4 by Ben Gamari at 2025-04-24T18:04:53-04:00 compiler: Ensure that Panic.Plain.assertPanic' provides callstack In 36cddd2ce1a3bc62ea8a1307d8bc6006d54109cf @alt-romes removed CallStack output from `GHC.Utils.Panic.Plain.assertPanic'`. While this output is redundant due to the exception backtrace proposal, we may be bootstrapping with a compiler which does not yet include this machinery. Reintroduce the output for now. Fixes #25898. - - - - - 217caad1 by Matthew Pickering at 2025-04-25T18:58:42+01:00 Implement Explicit Level Imports for Template Haskell This commit introduces the `ExplicitLevelImports` and `ImplicitStagePersistence` language extensions as proposed in GHC Proposal #682. Key Features ------------ - `ExplicitLevelImports` adds two new import modifiers - `splice` and `quote` - allowing precise control over the level at which imported identifiers are available - `ImplicitStagePersistence` (enabled by default) preserves existing path-based cross-stage persistence behavior - `NoImplicitStagePersistence` disables implicit cross-stage persistence, requiring explicit level imports Benefits -------- - Improved compilation performance by reducing unnecessary code generation - Enhanced IDE experience with faster feedback in `-fno-code` mode - Better dependency tracking by distinguishing compile-time and runtime dependencies - Foundation for future cross-compilation improvements This implementation enables the separation of modules needed at compile-time from those needed at runtime, allowing for more efficient compilation pipelines and clearer code organization in projects using Template Haskell. Implementation Notes -------------------- The level which a name is availble at is stored in the 'GRE', in the normal GlobalRdrEnv. The function `greLevels` returns the levels which a specific GRE is imported at. The level information for a 'Name' is computed by `getCurrentAndBindLevel`. The level validity is checked by `checkCrossLevelLifting`. Instances are checked by `checkWellLevelledDFun`, which computes the level an instance by calling `checkWellLevelledInstanceWhat`, which sees what is available at by looking at the module graph. Modifications to downsweep -------------------------- Code generation is now only enabled for modules which are needed at compile time. See the Note [-fno-code mode] for more information. Uniform error messages for level errors --------------------------------------- All error messages to do with levels are now reported uniformly using the `TcRnBadlyStaged` constructor. Error messages are uniformly reported in terms of levels. 0 - top-level 1 - quote level -1 - splice level The only level hard-coded into the compiler is the top-level in GHC.Types.ThLevelIndex.topLevelIndex. Uniformly refer to levels and stages ------------------------------------ There was much confusion about levels vs stages in the compiler. A level is a semantic concept, used by the typechecker to ensure a program can be evaluated in a well-staged manner. A stage is an operational construct, program evaluation proceeds in stages. Deprecate -Wbadly-staged-types ------------------------------ `-Wbadly-staged-types` is deprecated in favour of `-Wbadly-levelled-types`. Lift derivation changed ----------------------- Derived lift instances will now not generate code with expression quotations. Before: ``` data A = A Int deriving Lift => lift (A x) = [| A $(lift x) |] ``` After: ``` lift (A x) = conE 'A `appE` (lift x) ``` This is because if you attempt to derive `Lift` in a module where `NoImplicitStagePersistence` is enabled, you would get an infinite loop where a constructor was attempted to be persisted using the instance you are currently defining. GHC API Changes --------------- The ModuleGraph now contains additional information about the type of the edges (normal, quote or splice) between modules. This is abstracted using the `ModuleGraphEdge` data type. Fixes #25828 ------------------------- Metric Increase: MultiLayerModulesTH_Make ------------------------- - - - - - 7641a74a by Simon Peyton Jones at 2025-04-26T22:05:19-04:00 Get a decent MatchContext for pattern synonym bindings In particular when we have a pattern binding K p1 .. pn = rhs where K is a pattern synonym. (It might be nested.) This small MR fixes #25995. It's a tiny fix, to an error message, removing an always-dubious `unkSkol`. The bug report was in the context of horde-ad, a big program, and I didn't manage to make a small repro case quickly. I decided not to bother further. - - - - - ce616f49 by Simon Peyton Jones at 2025-04-27T21:10:25+01:00 Fix infelicities in the Specialiser On the way to #23109 (unary classes) I discovered some infelicities (or maybe tiny bugs, I forget) in the type-class specialiser. I also tripped over #25965, an outright bug in the rule matcher Specifically: * Refactor: I enhanced `wantCallsFor`, whih previously always said `True`, to discard calls of class-ops, data constructors etc. This is a bit more efficient; and it means we don't need to worry about filtering them out later. * Fix: I tidied up some tricky logic that eliminated redundant specialisations. It wasn't working correctly. See the expanded Note [Specialisations already covered], and (MP3) in Note [Specialising polymorphic dictionaries]. See also the new top-level `alreadyCovered` function, which now goes via `GHC.Core.Rules.ruleLhsIsMoreSpecific` I also added a useful Note [The (CI-KEY) invariant] * Fix #25965: fixed a tricky bug in the `go_fam_fam` in `GHC.Core.Unify.uVarOrFam`, which allows matching to succeed without binding all type varibles. I enhanced Note [Apartness and type families] some more * #25703. This ticket "just works" with -fpolymorphic-specialisation; but I was surprised that it worked! In this MR I added documentation to Note [Interesting dictionary arguments] to explain; and tests to ensure it stays fixed. - - - - - 22d11fa8 by Simon Peyton Jones at 2025-04-28T18:05:19-04:00 Track rewriter sets more accurately in constraint solving The key change, which fixed #25440, is to call `recordRewriter` in GHC.Tc.Solver.Rewrite.rewrite_exact_fam_app. This missing call meant that we were secretly rewriting a Wanted with a Wanted, but not really noticing; and that led to a very bad error message, as you can see in the ticket. But of course that led me into rabbit hole of other refactoring around the RewriteSet code: * Improve Notes [Wanteds rewrite Wanteds] * Zonk the RewriterSet in `zonkCtEvidence` rather than only in GHC.Tc.Errors. This is tidier anyway (e.g. de-clutters debug output), and helps with the next point. * In GHC.Tc.Solver.Equality.inertsCanDischarge, don't replace a constraint with no rewriters with an equal constraint that has many. See See (CE4) in Note [Combining equalities] * Move zonkRewriterSet and friends from GHC.Tc.Zonk.Type into GHC.Tc.Zonk.TcType, where they properly belong. A handful of tests get better error messages. For some reason T24984 gets 12% less compiler allocation -- good Metric Decrease: T24984 - - - - - 5ddbe01c by Ben Gamari at 2025-04-29T09:50:06-04:00 Don't emit unprintable characters when printing Uniques When faced with an unprintable tag we now instead print the codepoint number. Fixes #25989. (cherry picked from commit e832b1fadee66e8d6dd7b019368974756f8f8c46) - - - - - 350 changed files: - compiler/GHC.hs - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/CmmToAsm/RV64/CodeGen.hs - compiler/GHC/CmmToAsm/RV64/Instr.hs - compiler/GHC/CmmToAsm/RV64/Ppr.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/InstEnv.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Data/Graph/Directed/Reachability.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Flags.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/Session.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/HsToCore/Breakpoints.hs - compiler/GHC/Iface/Recomp.hs - compiler/GHC/Iface/Tidy.hs - 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compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/TyCl/Instance.hs - compiler/GHC/Tc/Types.hs - compiler/GHC/Tc/Types/Constraint.hs - compiler/GHC/Tc/Types/LclEnv.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Types/TH.hs - compiler/GHC/Tc/Utils/Backpack.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Tc/Utils/Env.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Zonk/TcType.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Basic.hs - compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/Name/Reader.hs - + compiler/GHC/Types/ThLevelIndex.hs - compiler/GHC/Types/Unique.hs - compiler/GHC/Unit/Home/PackageTable.hs - compiler/GHC/Unit/Module/Deps.hs - compiler/GHC/Unit/Module/Graph.hs - compiler/GHC/Unit/Module/Imported.hs - compiler/GHC/Unit/Module/ModSummary.hs - + compiler/GHC/Unit/Module/Stage.hs - compiler/GHC/Unit/Types.hs - compiler/GHC/Utils/Binary.hs - compiler/GHC/Utils/Outputable.hs - compiler/GHC/Utils/Panic/Plain.hs - 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