[Git][ghc/ghc][wip/module_graph_mode] 150 commits: Driver: make MonadComprehensions imply ParallelListComp

Rodrigo Mesquita pushed to branch wip/module_graph_mode at Glasgow Haskell Compiler / GHC Commits: 34a9b55d by lazyLambda at 2025-04-04T06:22:26-04:00 Driver: make MonadComprehensions imply ParallelListComp This commit changes GHC.Driver.Flags.impliedXFlags to make the MonadComprehensions extension enable the ParallelListComp extension. Fixes #25645 - - - - - d99eb7cd by sheaf at 2025-04-04T06:23:28-04:00 NamedDefaults: handle poly-kinded unary classes With this commit, we accept named default declarations for poly-kinded classes such as Typeable, e.g. default Typeable (Char) This used to fail because we assumed the kind of the class was monomorphic, e.g. Type -> Constraint (Type -> Type) -> Constraint Nat -> Constraint Now, we can handle a simple polymorphic class such as Typeable :: forall k. k -> Constraint Note that we keep the restriction that the class must only have one visible argument. This is all explained in the new Note [Instance check for default declarations] in GHC.Tc.Gen.Default. Fixes #25882 - - - - - 4cbc90de by sheaf at 2025-04-04T11:39:05-04:00 LLVM: add type annotations to AtomicFetch_cmm.cmm - - - - - e2237305 by sheaf at 2025-04-04T11:39:05-04:00 Cmm lint: lint argument types of CallishMachOps This commit adds a new check to Cmm lint to ensure that the argument types to a CallishMachOp are correct. The lack of this check was detected in the AtomicFetch test: the literals being passed as the second arguments to operations such as 'fetch_add', 'fetch_and'... were of the wrong width, which tripped up the LLVM backend. - - - - - 9363e547 by Cheng Shao at 2025-04-04T11:39:50-04:00 ci: add ghc-wasm-meta integration testing jobs This patch adds ghc-wasm-meta integration testing jobs to the CI pipeline, which are only triggered via the `test-wasm` MR label or manually when the `wasm` label is set. These jobs will fetch the wasm bindists and test them against a variety of downstream projects, similarly to head.hackage jobs for native bindists, offering a convenient way to catch potential downstream breakage while refactoring the wasm backend. - - - - - 27029e60 by Adam Gundry at 2025-04-04T11:40:36-04:00 base: Minor fixes to GHC.Records haddocks This corrects a stale reference to OverloadedRecordFields (which should be OverloadedRecordDot), fixes the haddock link syntax and adds an @since pragma. - - - - - f827c4c6 by Rodrigo Mesquita at 2025-04-07T11:22:10-04:00 Parametrize default logger action with Handles Introduce `defaultLogActionWithHandles` to allow GHC applications to use GHC's formatting but using custom handles. `defaultLogAction` is then trivially reimplemented as ``` defaultLogActionWithHandles stdout stderr ``` - - - - - 5dade5fd by sheaf at 2025-04-07T11:23:02-04:00 Finer-grained recompilation checking for exports This commit refines the recompilation checking logic, to avoid recompiling modules with an explicit import list when the modules they import start exporting new items. More specifically, when: 1. module N imports module M, 2. M is changed, but in a way that: a. preserves the exports that N imports b. does not introduce anything that forces recompilation downstream, such as orphan instances then we no longer require recompilation of N. Note that there is more to (2a) as initially meets the eye: - if N includes a whole module or "import hiding" import of M, then we require that the export list of M does not change, - if N only includes explicit imports, we check that the imported items don't change, e.g. - if we have @import M(T(K, f), g)@, we must check that N continues to export all these identifiers, with the same Avail structure (i.e. we should error if N stops bundling K or f with T) - if we have @import M(T(..))@, we must check that the children of T have not changed See Note [When to recompile when export lists change?] in GHC.Iface.Recomp. This is all tested in the new tests RecompExports{1,2,3,4,5} Fixes #25881 - - - - - f32d6c2b by Andreas Klebinger at 2025-04-07T22:01:25-04:00 NCG: AArch64 - Add -finter-module-far-jumps. When enabled the arm backend will assume jumps to targets outside of the current module are further than 128MB away. This will allow for code to work if: * The current module results in less than 128MB of code. * The whole program is loaded within a 4GB memory region. We have seen a few reports of broken linkers (#24648) where this flag might allow a program to compile/run successfully at a very small performance cost. ------------------------- Metric Increase: T783 ------------------------- - - - - - 553c280b by Andreas Klebinger at 2025-04-07T22:02:11-04:00 Revert "rts: fix small argument passing on big-endian arch (fix #23387)" Based on analysis documented in #25791 this doesn't fully fix the big while introducing new bugs on little endian architectures. A more complete fix will have to be implemented to fix #23387 This reverts commit 4f02d3c1a7b707e609bb3aea1dc6324fa19a5c39. - - - - - b0dc6599 by Andreas Klebinger at 2025-04-07T22:02:11-04:00 Interpreter: Fixes to handling of subword value reads/writes. Load subword values as full words from the stack truncating/expanding as neccesary when dealing with subwords. This way byte order is implicitly correct. This commit also fixes the order in which we are pushing literals onto the stack on big endian archs. Last but not least we enable a test for ghci which actually tests these subword operations. - - - - - ed38c09b by Cheng Shao at 2025-04-07T22:02:53-04:00 testsuite: don't test WasmControlFlow stdout This patch solves a potential test flakiness in `WasmControlFlow` by removing `WasmControlFlow.stdout` which is not so portable/stable as it seems. See added `Note [WasmControlFlow]` for more detailed explanation. - - - - - f807c590 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 debugger: Add docs to obtainTermFromId - - - - - 5dba052d by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 Move logic to find and set Breakpoint to GHC Breakpoints are uniquely identified by a module and an index unique within that module. `ModBreaks` of a Module contains arrays mapping from this unique breakpoint index to information about each breakpoint. For instance, `modBreaks_locs` stores the `SrcSpan` for each breakpoint. To find a breakpoint using the line number you need to go through all breakpoints in the array for a given module and look at the line and column stored in the `SrcSpan`s. Similarly for columns and finding breakpoints by name. This logic previously lived within the `GHCi` application sources, however, it is common to any GHC applications wanting to set breakpoints, like the upcoming `ghc-debugger`. This commit moves this logic for finding and setting breakpoints to the GHC library so it can be used by both `ghci` and `ghc-debugger`. - - - - - bc0b9f73 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 Refactor and move logic for identifier breakpoints Breakpoints can be set on functions using syntax of the form `[Module.]function`. The parsing, resolution (e.g. inferring implicit module), and validation of this syntax for referring to functions was tightly coupled with its GHCi use. This commit extracts the general purpose bits of resolving this syntax into `GHC.Runtime.Debugger.Breakpoints` so it can be further used by other GHC applications and to improve the code structure of GHCi. Moreover, a few utilities that do splitting and joining of identifiers as strings were moved to `GHC.Runtime.Eval.Utils`, which also can be used in the future to clean up `GHC.Runtime.Eval` a bit. - - - - - 4f728d21 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 debugger: derive Ord for BreakpointIds - - - - - 5528771c by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 debugger: Move context utils from GHCi to GHC Moves `enclosingTickSpan`, `getCurrentBreakSpan`, and `getCurrentBreakModule`, general utilities on the internal debugger state, into the GHC library. - - - - - 4871f543 by sheaf at 2025-04-08T17:42:43-04:00 Implicit quantification in type synonyms: add test This adds a test for ticket #24090, which involves implicit quantification in type synonyms. The underlying issue was fixed in 0d4ee209dfe53e5074d786487f531dabc36d561c. - - - - - 48917d3c by sheaf at 2025-04-08T17:42:44-04:00 Turn on implicit-rhs-quantification by default This flag was added to GHC 9.8, and will be removed in a future GHC release. In preparation, this commit adds it to the default warning flags. - - - - - 629be068 by Rodrigo Mesquita at 2025-04-08T17:43:26-04:00 debugger: Add breakpoints to every Stmt While single-stepping through a Haskell program we stop at every breakpoint. However, we don't introduce breakpoints at every single expression (e.g. single variables) because they would be too many and uninteresting. That said, in a do-block, it is expected that stepping over would break at every line, even if it isn't particularly interesting (e.g. a single arg like getArgs). Moreover, let-statements in do-blocks, despite only being evaluated once needed, lead to surprising jumps while stepping through because some have outermost (outside the let) breakpoints while others don't. This commit makes every statement in a do-block have a breakpoint. This leads to predictable stepping through in a do-block. Duplicate breakpoints in the same location are avoided using the existing blacklist mechanism, which was missing a check in one relevant place. Fixes #25932 - - - - - 99a3affd by Matthew Pickering at 2025-04-08T17:44:08-04:00 driver: refactor: Split downsweep and MakeAction into separate modules. This will facilitate using the downsweep functions in other parts of the compiler than just --make mode. Also, the GHC.Driver.Make module was huge. Now it's still huge but slightly smaller! - - - - - ecfec4df by sheaf at 2025-04-09T14:13:12-04:00 Store user-written qualification in the GhcRn AST This commit ensures we store the original user-written module qualification in the renamed AST. This allows us to take into account the user-written qualification in error messages. Fixes #25877 - - - - - 97c884e2 by sheaf at 2025-04-09T14:13:12-04:00 TcRnIllegalTermLevelUse: simpler error when possible This commit makes GHC emit a simple error message in the case of an illegal term-level use of a data constructor: we will try to report an out-of-scope error instead of a "Illegal term level use" error, as the latter might be a bit overwhelming for newcomers. We do this when we have a data constructor import suggestion to provide to the user. For example: module M where { data A = A } module N where import M(A) x = Bool -- Illegal term-level use of Bool y = A -- Data constructor not in scope: A. -- Perhaps add 'A' to the import list of 'M'. This commit also revamps the "similar names" suggestion mechanism, and in particular its treatment of name spaces. Now, which name spaces we suggest is based solely on what we are looking for, and no longer on the NameSpace of the Name we have. This is because, for illegal term-level use errors, it doesn't make much sense to change the suggestions based on the fact that we resolved to e.g. a type constructor/class; what matters is what we were expecting to see in this position. See GHC.Rename.Unbound.{suggestionIsRelevant,relevantNameSpace} as well as the new constructors to GHC.Tc.Errors.Types.WhatLooking. Fixes #23982 - - - - - bff645ab by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00 driver: Split Session functions out of Main This commit moves out functions that help in creating and validating a GHC multi session from Main into the ghc library where they can be used by other GHC applications. Moreover, `Mode` processing and `checkOptions` linting were moved to separate modules within the ghc-bin executable package. In particular: - Move `Mode` types and functions (referring to the mode GHC is running on) to `ghc-bin:GHC.Driver.Session.Mode` - Move `checkOptions` and aux functions, which validates GHC DynFlags based on the mode, to `ghc-bin:GHC.Driver.Session.Lint` - Moves `initMulti`, `initMake`, and aux functions, which initializes a make/multi-unit session, into `ghc:GHC.Driver.Session.Units`. - - - - - 501b015e by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00 docs: Improve haddock of ExecComplete - - - - - dea98988 by Andreas Klebinger at 2025-04-09T19:23:57-04:00 Avoid oversaturing constructor workers. Constructor applications always need to take the exact number of arguments. If we can't ensure that instead apply the constructor worker like a regular function. Fixes #23865 - - - - - f1acdd2c by sheaf at 2025-04-09T19:25:41-04:00 NamedDefaults: require the class to be standard We now only default type variables if they only appear in constraints of the form `C v`, where `C` is either a standard class or a class with an in-scope default declaration. This rectifies an oversight in the original implementation of the NamedDefault extensions that was remarked in #25775; that implementation allowed type variables to appear in unary constraints which had arbitrary classes at the head. See the rewritten Note [How type-class constraints are defaulted] for details of the implementation. Fixes #25775 Fixes #25778 - - - - - 5712e0d6 by Vladislav Zavialov at 2025-04-10T05:17:38+00:00 Retry type/class declarations and instances (#12088) Retry type/class declarations and instances to account for non-lexical dependencies arising from type/data family instances. This patch improves the kind checker's ability to use type instances in kind checking of other declarations in the same module. * Key change: tcTyAndClassDecls now does multiple passes over the TyClGroups, as long as it is able to make progress. See the new Note [Retrying TyClGroups] in GHC.Tc.TyCl * Supporting change: FVs of a TyClGroup are now recorded in its extension field, namely XCTyClGroup. See the new Note [Prepare TyClGroup FVs] in GHC.Rename.Module * Instances are no longer inserted at the earliest positions where their FVs are bound. This is a simplification. See the new Note [Put instances at the end] in GHC.Rename.Module * Automatic unpacking is now more predictable, but fewer fields get unpacked by default. Use explicit {-# UNPACK #-} pragmas instead. See the new Note [Flaky -funbox-strict-fields with type/data families] For the wide range of newly accepted programs, consult the added test cases. Fixed tickets: #12088, #12239, #14668, #15561, #16410, #16448, #16693, #19611, #20875, #21172, #22257, #25238, #25834 Metric Decrease: T8095 - - - - - bc73a78d by sheaf at 2025-04-10T15:07:24-04:00 checkFamApp: don't be so eager to cycle break As remarked in #25933, a pure refactoring of checkTyEqRhs in ab77fc8c7adebd610aa0bd99d653f9a6cc78a374 inadvertently changed behaviour, as it caused GHC to introduce cycle-breaker variables in some unnecessary circumstances. This commit refactors 'GHC.Tc.Utils.Unify.checkFamApp' in a way that should restore the old behaviour, so that, when possible, we first recur into the arguments and only introduce a cycle breaker if this recursion fails (e.g. due to an occurs check failure). Fixes #25933 - - - - - 3acd8182 by Andreas Klebinger at 2025-04-10T22:32:12-04:00 Expand docs for RTS flag `-M`. The behaviour of how/when exceptions are raised was not really covered in the docs. - - - - - 026c1a39 by Adam Sandberg Ericsson at 2025-04-10T22:32:56-04:00 add cases for more SchedulerStatus codes in rts_checkSchedStatus - - - - - 5977c6a1 by sheaf at 2025-04-10T22:33:46-04:00 Squash warnings in GHC.Runtime.Heap.Inspect There were incomplete record selector warnings in GHC.Runtime.Heap.Inspect due to the use of the partial 'dataArgs' record selector. This is fixed by passing the fields to the 'extractSubTerms' function directly, rather than passing a value of the parent data type. - - - - - 6a3e38f5 by Andreas Klebinger at 2025-04-11T15:13:53-04:00 hadrian: Make ghcWithInterpreter the universal source of truth about availability of the interpreter We were doing some ad-hoc checks in different places in hadrian to determine whether we supported the interprter or not. Now this check if confined to one function, `ghcWithInterpreter`, and all the places which use this information consult `ghcWithInterpreter` to determine what to do. Fixes #25533. - - - - - 207de6f1 by Matthew Pickering at 2025-04-11T15:14:37-04:00 testsuite: Fix running TH tests with profiled dynamic compiler Previously, I had failed to update the ghc_th_way_flags logic for the profiled dynamic compiler. In addition to this `ghc_dynamic` was incorrectly set for profiled dynamic compiler. I also updated MultiLayerModulesTH_OneShot test to work for any compiler linkage rather than just dynamic. Fixes #25947 ------------------------- Metric Decrease: MultiLayerModulesTH_Make ------------------------- - - - - - 5455f2b9 by Matthew Pickering at 2025-04-12T08:31:36-04:00 driver: Add support for "Fixed" nodes in the ModuleGraph A fixed node in the module graph is one which we presume is already built. It's therefore up to the user to make sure that the interface file and any relevant artifacts are available for a fixed node. Fixed/Compile nodes are represented by the ModuleNodeInfo type, which abstracts the common parts of Fixed/Compile nodes with accessor functions of type `ModuleNodeInfo -> ...`. Fixed nodes can only depend on other fixed nodes. This invariant can be checked by the function `checkModuleGraph` or `mkModuleGraphChecked`. --make mode is modified to work with fixed mode. In order to "compile" a fixed node, the artifacts are just loaded into the HomePackageTable. Currently nothing in the compiler will produce Fixed nodes but this is tested with the FixedNodes GHC API test. In subsequent patches we are going to remove the ExternalModuleGraph and use Fixed nodes for modules in the module graph in oneshot mode. Fixes #25920 - - - - - ad64d5c2 by Cheng Shao at 2025-04-12T08:32:19-04:00 ci: remove manual case of ghc-wasm-meta downstream testing jobs This patch removes the manual case of ghc-wasm-meta downstream testing jobs; now the only way of including them in the pipeline and running them is via the test-wasm label. The reason of the removal is it proves to be problematic for MRs with only the wasm label; the wasm job would succeed, then the pipeline status would be waiting for manual action instead of succeeding. There needs to be separate jobs for the label-triggered and manual-triggered cases, but I don't think it's worth that extra complexity, the label-triggered case is already sufficient. - - - - - b34890c7 by Vladislav Zavialov at 2025-04-13T01:08:21+03:00 Fix EmptyCase panic in tcMatches (#25960) Due to faulty reasoning in Note [Pattern types for EmptyCase], tcMatches was too keen to panic. * Old (incorrect) assumption: pat_tys is a singleton list. This does not hold when \case{} is checked against a function type preceded by invisible forall. See the new T25960 test case. * New (hopefully correct) assumption: vis_pat_tys is a singleton list. This should follow from: checkArgCounts :: MatchGroup GhcRn ... -> TcM VisArity checkArgCounts (MG { mg_alts = L _ [] }) = return 1 ... - - - - - 84806ebc by Vladislav Zavialov at 2025-04-13T11:40:08-04:00 Remove unused type: TokenLocation - - - - - 05eb50df by Vladislav Zavialov at 2025-04-13T19:16:38-04:00 Register EpToken in Parser.PostProcess.Haddock (#22558) This change allows us to reject more badly placed Haddock comments. Examples: module -- | Bad comment for the module T17544_kw where data Foo -- | Bad comment for MkFoo where MkFoo :: Foo newtype Bar -- | Bad comment for MkBar where MkBar :: () -> Bar class Cls a -- | Bad comment for clsmethod where clsmethod :: a - - - - - 01944e5e by Vladislav Zavialov at 2025-04-13T19:17:21-04:00 Reject puns in T2T (#24153) This patch implements pun detection in T2T. Consider: x = 42 f, g :: forall a -> ... f (type x) = g x In accordance with the specification, the `g x` function call is renamed as a term, so `x` refers to the top-level binding `x = 42`, not to the type variable binding `type x` as one might expect. This is somewhat counterintuitive because `g` expects a type argument. Forbidding puns in T2T allows us to produce a helpful error message: Test.hs:5:16: error: [GHC-09591] Illegal punned variable occurrence in a required type argument. The name ‘x’ could refer to: ‘x’ defined at Test.hs:3:1 ‘x’ bound at Test.hs:5:9 This commit is a follow up to 0dfb1fa799af254c8a1e1045fc3996af2d57a613 where checking for puns was left as future work. - - - - - cc580552 by Vladislav Zavialov at 2025-04-13T19:18:02-04:00 Additional test cases for #12088, #13790 Extract more test cases from ticket discussions, including multi-module examples. Follow up to 5712e0d646f611dfbfedfd7ef6dff3a18c016edb - - - - - d47bf776 by Matthew Pickering at 2025-04-14T16:44:41+01:00 driver: Use ModuleGraph for oneshot and --make mode This patch uses the `hsc_mod_graph` field for both oneshot and --make mode. Therefore, if part of the compiler requires usage of the module graph, you do so in a uniform way for the two different modes. The `ModuleGraph` describes the relationship between the modules in the home package and units in external packages. The `ModuleGraph` can be queried when information about the transitive closure of a package is needed. For example, the primary use of the ModuleGraph from within the compiler is in the loader, which needs to know the transitive closure of a module so it can load all the relevant objects for evaluation. In --make mode, downsweep computes the ModuleGraph before any compilation starts. In oneshot mode, a thunk is created at the start of compilation, which when forced will compute the module graph beneath the current module. The thunk is only forced at the moment when the user uses Template Haskell. Finally, there are some situations where we need to discover what dependencies to load but haven't loaded a module graph at all. In this case, there is a fallback which computes the transitive closure on the fly and doesn't cache the result. Presumably if you are going to call getLinkDeps a lot, you would compute the right ModuleGraph before you started. Importantly, this removes the ExternalModuleGraph abstraction. This was quite awkward to work with since it stored information about the home package inside the EPS. This patch will also be very useful when implementing explicit level imports, which requires more significant use of the module graph in order to determine which level instances are available at. Towards #25795 ------------------------- Metric Decrease: MultiLayerModulesTH_Make MultiLayerModulesTH_OneShot ------------------------- - - - - - 395e0ad1 by sheaf at 2025-04-16T12:33:26-04:00 base: remove .Internal modules (e.g. GHC.TypeLits) This commit removes the following internal modules from base, as per CLC proposal 217: - GHC.TypeNats.Internal - GHC.TypeLits.Internal - GHC.ExecutionStack.Internal Fixes #25007 - - - - - e0f3ff11 by Patrick at 2025-04-17T04:31:12-04:00 Refactor Handling of Multiple Default Declarations Fixes: #25912, #25914, #25934 Previously, GHC discarded all loaded defaults (tcg_default) when local defaults were encountered during typechecking. According to the exportable-named-default proposal (sections 2.4.2 and 2.4.3), local defaults should be merged into tcg_default, retaining any defaults already present while overriding where necessary. Key Changes: * Introduce DefaultProvenance to track the origin of default declarations (local, imported, or built-in), replacing the original cd_module in ClassDefaults with cd_provenance :: DefaultProvenance. * Rename tcDefaults to tcDefaultDecls, limiting its responsibility to only converting renamed class defaults into ClassDefaults. * Add extendDefaultEnvWithLocalDefaults to merge local defaults into the environment, with proper duplication checks: - Duplicate local defaults for a class trigger an error. - Local defaults override imported or built-in defaults. * Update and add related notes: Note [Builtin class defaults], Note [DefaultProvenance]. * Add regression tests: T25912, T25914, T25934. Thanks sam and simon for the help on this patch. Co-authored-by: sheaf - - - - - 386f1854 by Teo Camarasu at 2025-04-17T04:31:55-04:00 template-haskell: Remove `addrToByteArrayName` and `addrToByteArray` These were part of the implementation of the `Lift ByteArray` instance and were errornously exported because this module lacked an explicit export list. They have no usages on Hackage. Resolves #24782 - - - - - 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 - - - - - 6467d61e by Brandon Chinn at 2025-04-29T18:36:03-04:00 Fix lexing "\^\" (#25937) This broke in the refactor in !13128, where the old code parsed escape codes and collapsed string gaps at the same time, but the new code collapsed gaps first, then resolved escape codes. The new code used a naive heuristic to skip escaped backslashes, but didn't account for "\^\". - - - - - 99868a86 by Jens Petersen at 2025-04-29T18:36:44-04:00 hadrian: default selftest to disabled - - - - - aba2a4a5 by Zubin Duggal at 2025-04-30T06:35:59-04:00 get-win32-tarballs.py: List tarball files to be downloaded if we cannot find them Fixes #25929 - - - - - d99a617b by Ben Gamari at 2025-04-30T06:36:40-04:00 Move Data ModuleName instance to Language.Haskell.Syntax.Module.Name Fixes #25968. - - - - - 9995c2b7 by Serge S. Gulin at 2025-05-04T17:13:36+03:00 Support for ARM64 Windows (LLVM-enabled) (fixes #24603) 1. Add Windows AArch64 cross-compilation support via CI jobs Introduce new CI configurations for cross-compiling to Windows ARM64 using Debian12Wine, FEX, and MSYS2. Configure toolchain variables for LLVM MinGW and Wine emulation in CI pipelines. 2. Adjust compiler and RTS for AArch64 Windows compatibility Reserve register `x18` on Windows and Darwin platforms in AArch64 codegen. Handle Windows-specific relocations and data sections in AArch64 assembler. Update PEi386 linker to recognize ARM64 binaries and support exception handling. Adjust LLVM target definitions and data layouts for new architectures. Update `ghc-toolchain` and build scripts to handle `TablesNextToCode` on Windows ARM64. 3. Enhance CI scripts and stability Modify `ci.sh` to handle mingw cross-targets, fixing GHC executable paths and test execution. Use `diff -w` in tests to ignore whitespace differences, improving cross-platform consistency. 4. Refactor and clean up code Remove redundant imports in hello.hs test. Improve error messages and checks for unsupported configurations in the driver. Add `EXDEV` error code to `errno.js`. Add async/sync flags to IO logs at `base.js`. Improve POSIX compatibility for file close at `base.js`: decrease indeterminism for mixed cases of async and sync code. 5. Update dependencies: `Cabal`, `Win32`, `directory`, `process`, `haskeline`, and `unix`. submodule Co-authored-by: Cheng Shao Co-authored-by: Dmitrii Egorov Co-authored-by: Andrei Borzenkov - - - - - 50fa8165 by Javran Cheng at 2025-05-05T05:55:39-04:00 Suppress unused do-binding if discarded variable is Any or ZonkAny. Consider example (#25895):

do { forever (return ()); blah }

where `forever :: forall a b. IO a -> IO b`. Nothing constrains `b`, so it will be instantiates with `Any` or `ZonkAny`. But we certainly don't want to complain about a discarded do-binding. Fixes #25895 - - - - - e46c6b18 by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00 Refactor mkTopLevImportedEnv out of mkTopLevEnv This makes the code clearer and allows the top-level import context to be fetched directly from the HomeModInfo through the API (e.g. useful for the debugger). - - - - - 0ce0d263 by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00 Export sizeOccEnv from GHC.Types.Name.Occurrence Counts the number of OccNames in an OccEnv - - - - - 165f98d8 by Simon Peyton Jones at 2025-05-06T09:02:39-04:00 Fix a bad untouchability bug im simplifyInfer This patch addresses #26004. The root cause was that simplifyInfer was willing to unify variables "far out". The fix, in runTcSWithEvBinds', is to initialise the inert set given-eq level with the current level. See (TGE6) in Note [Tracking Given equalities] in GHC.Tc.Solver.InertSet Two loosely related refactors: * Refactored approximateWCX to return just the free type variables of the un-quantified constraints. That avoids duplication of work (these free vars are needed in simplifyInfer) and makes it clearer that the constraints themselves are irrelevant. * A little local refactor of TcSMode, which reduces the number of parameters to runTcSWithEvBinds - - - - - 6e67fa08 by Ben Gamari at 2025-05-08T06:21:21-04:00 llvmGen: Fix built-in variable predicate Previously the predicate to identify LLVM builtin global variables was checking for `$llvm` rather than `@llvm` as it should. - - - - - a9d0a22c by Ben Gamari at 2025-05-08T06:21:22-04:00 llvmGen: Fix linkage of built-in arrays LLVM now insists that built-in arrays use Appending linkage, not Internal. Fixes #25769. - - - - - 9c6d2b1b by sheaf at 2025-05-08T06:22:11-04:00 Use mkTrAppChecked in ds_ev_typeable This change avoids violating the invariant of mkTrApp according to which the argument should not be a fully saturated function type. This ensures we don't return false negatives for type equality involving function types. Fixes #25998 - - - - - 75cadf81 by Ryan Hendrickson at 2025-05-08T06:22:55-04:00 haddock: Preserve indentation in multiline examples Intended for use with :{ :}, but doesn't look for those characters. Any consecutive lines with birdtracks will only have initial whitespace stripped up to the column of the first line. - - - - - fee9b351 by Cheng Shao at 2025-05-08T06:23:36-04:00 ci: re-enable chrome for wasm ghci browser tests Currently only firefox is enabled for wasm ghci browser tests, for some reason testing with chrome works on my machine but gets stuck on gitlab instance runners. This patch re-enables testing with chrome by passing `--no-sandbox`, since chrome sandboxing doesn't work in containers without `--cap-add=SYS_ADMIN`. - - - - - 282df905 by Vladislav Zavialov at 2025-05-09T03:18:25-04:00 Take subordinate 'type' specifiers into account This patch fixes multiple bugs (#22581, #25983, #25984, #25991) in name resolution of subordinate import lists. Bug #22581 ---------- In subordinate import lists, the use of the `type` namespace specifier used to be ignored. For example, this import statement was incorrectly accepted: import Prelude (Bool(type True)) Now it results in an error message: <interactive>:2:17: error: [GHC-51433] In the import of ‘Prelude’: a data type called ‘Bool’ is exported, but its subordinate item ‘True’ is not in the type namespace. Bug #25983 ---------- In subordinate import lists within a `hiding` clause, non-existent items led to a poor warning message with -Wdodgy-imports. Consider: import Prelude hiding (Bool(X)) The warning message for this import statement used to misreport the cause of the problem: <interactive>:3:24: warning: [GHC-56449] [-Wdodgy-imports] In the import of ‘Prelude’: an item called ‘Bool’ is exported, but it is a type. Now the warning message is correct: <interactive>:2:24: warning: [GHC-10237] [-Wdodgy-imports] In the import of ‘Prelude’: a data type called ‘Bool’ is exported, but it does not export any constructors or record fields called ‘X’. Bug #25984 ---------- In subordinate import lists within a `hiding` clause, non-existent items resulted in the entire import declaration being discarded. For example, this program was incorrectly accepted: import Prelude hiding (Bool(True,X)) t = True Now it results in an error message: <interactive>:2:5: error: [GHC-88464] Data constructor not in scope: True Bug #25991 ---------- In subordinate import lists, it was not possible to refer to a class method if there was an associated type of the same name: module M_helper where class C a b where type a # b (#) :: a -> b -> () module M where import M_helper (C((#))) This import declaration failed with: M.hs:2:28: error: [GHC-10237] In the import of ‘M_helper’: an item called ‘C’ is exported, but it does not export any children (constructors, class methods or field names) called ‘#’. Now it is accepted. Summary ------- The changes required to fix these bugs are almost entirely confined to GHC.Rename.Names. Other than that, there is a new error constructor BadImportNonTypeSubordinates with error code [GHC-51433]. Test cases: T22581a T22581b T22581c T22581d T25983a T25983b T25983c T25983d T25983e T25983f T25983g T25984a T25984b T25991a T25991b1 T25991b2 - - - - - 51b0ce8f by Simon Peyton Jones at 2025-05-09T03:19:07-04:00 Slighty improve `dropMisleading` Fix #26105, by upgrading the (horrible, hacky) `dropMisleading` function. This fix makes things a bit better but does not cure the underlying problem. - - - - - 7b2d1e6d by Simon Peyton Jones at 2025-05-11T03:24:47-04:00 Refine `noGivenNewtypeReprEqs` to account for quantified constraints This little MR fixes #26020. We are on the edge of completeness for newtype equalities (that doesn't change) but this MR makes GHC a bit more consistent -- and fixes the bug reported. - - - - - eaa8093b by Cheng Shao at 2025-05-11T03:25:28-04:00 wasm: mark freeJSVal as INLINE This patch marks `freeJSVal` as `INLINE` for the wasm backend. I noticed that the `freeJSVal` invocations are not inlined when inspecting STG/Cmm dumps of downstream libraries that use release build of the wasm backend. The performance benefit of inlining here is very modest, but so is the cost anyway; if you are using `freeJSVal` at all then you care about every potential chance to improve performance :) - - - - - eac196df by Cheng Shao at 2025-05-11T03:25:28-04:00 wasm: add zero length fast path for fromJSString This patch adds a zero length fast path for `fromJSString`; when marshaling a zero-length `JSString` we don't need to allocate an empty `ByteArray#` at all. - - - - - 652cba7e by Peng Fan at 2025-05-14T04:24:35-04:00 Add LoongArch NCG support Not supported before. - - - - - c01f4374 by Lin Runze at 2025-05-14T04:24:35-04:00 ci: Add LoongArch64 cross-compile CI for testing - - - - - ce6cf240 by Ben Gamari at 2025-05-14T04:25:18-04:00 rts/linker: Don't fail due to RTLD_NOW In !12264 we started using the NativeObj machinery introduced some time ago for loading of shared objects. One of the side-effects of this change is shared objects are now loaded eagerly (i.e. with `RTLD_NOW`). This is needed by NativeObj to ensure full visibility of the mappings of the loaded object, which is in turn needed for safe shared object unloading. Unfortunately, this change subtly regressed, causing compilation failures in some programs. Specifically, shared objects which refer to undefined symbols (e.g. which may be usually provided by either the executable image or libraries loaded via `dlopen`) will fail to load with eager binding. This is problematic as GHC loads all package dependencies while, e.g., evaluating TemplateHaskell splices. This results in compilation failures in programs depending upon (but not using at compile-time) packages with undefined symbol references. To mitigate this NativeObj now first attempts to load an object via eager binding, reverting to lazy binding (and disabling unloading) on failure. See Note [Don't fail due to RTLD_NOW]. Fixes #25943. - - - - - 88ee8bb5 by Sylvain Henry at 2025-05-14T04:26:15-04:00 Deprecate GHC.JS.Prim.Internal.Build (#23432) Deprecated as per CLC proposal 329 (https://github.com/haskell/core-libraries-committee/issues/329) - - - - - b4ed465b by Cheng Shao at 2025-05-14T04:26:57-04:00 libffi: update to 3.4.8 Bumps libffi submodule. - - - - - a3e71296 by Matthew Pickering at 2025-05-14T04:27:38-04:00 Remove leftover trace - - - - - 2d0ecdc6 by Cheng Shao at 2025-05-14T04:28:19-04:00 Revert "ci: re-enable chrome for wasm ghci browser tests" This reverts commit fee9b351fa5a35d5778d1252789eacaaf5663ae8. Unfortunately the chrome test jobs may still timeout on certain runners (e.g. OpenCape) for unknown reasons. - - - - - 3b3a5dec by Ben Gamari at 2025-05-15T16:10:01-04:00 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) - - - - - e1ef8974 by Mike Pilgrem at 2025-05-16T16:09:14-04:00 Translate iff in Haddock documentation into everyday English - - - - - fd64667d by Vladislav Zavialov at 2025-05-20T03:25:08-04:00 Allow the 'data' keyword in import/export lists (#25899) This patch introduces the 'data' namespace specifier in import and export lists. The intended use is to import data constructors without their parent type constructors, e.g. import Data.Proxy as D (data Proxy) type DP = D.Proxy -- promoted data constructor Additionally, it is possible to use 'data' to explicitly qualify any data constructors or terms, incl. operators and field selectors import Prelude (Semigroup(data (<>))) import Data.Function (data (&)) import Data.Monoid (data Dual, data getDual) x = Dual "Hello" <> Dual "World" & getDual The implementation mostly builds on top of the existing logic for the 'type' and 'pattern' namespace specifiers, plus there are a few tweaks to how we generate suggestions in error messages. - - - - - acc86753 by Ben Gamari at 2025-05-20T03:25:51-04:00 compiler: Use field selectors when creating BCOs This makes it easier to grep for these fields. - - - - - 60a55fd7 by Ben Gamari at 2025-05-20T03:25:51-04:00 compiler: Clarify BCO size Previously the semantics and size of StgBCO was a bit unclear. Specifically, the `size` field was documented to contain the size of the bitmap whereas it was actually the size of the closure *and* bitmap. Additionally, it was not as clear as it could be that the bitmap was a full StgLargeBitmap with its own `size` field. - - - - - ac9fb269 by Simon Peyton Jones at 2025-05-20T09:19:04-04:00 Track rewriter sets more accurately in constraint solving This MR addresses #26003, by refactoring the arcane intricacies of Note [Equalities with incompatible kinds]. NB: now retitled to Note [Equalities with heterogeneous kinds]. and the main Note for this MR. In particular: * Abandon invariant (COERCION-HOLE) in Note [Unification preconditions] in GHC.Tc.Utils.Unify. * Abandon invariant (TyEq:CH)) in Note [Canonical equalities] in GHC.Tc.Types.Constraint. * Instead: add invariant (REWRITERS) to Note [Unification preconditions]: unify only if the constraint has an empty rewriter set. Implementation: * In canEqCanLHSFinish_try_unification, skip trying unification if there is a non-empty rewriter set. * To do this, make sure the rewriter set is zonked; do so in selectNextWorkItem, which also deals with prioritisation. * When a coercion hole is filled, kick out inert equalities that have that hole as a rewriter. It might now be unlocked and available to unify. * Remove the ad-hoc `ch_hetero_kind` field of `CoercionHole`. * In `selectNextWorkItem`, priorities equalities withan empty rewriter set. * Defaulting: see (DE6) in Note [Defaulting equalities] and Note [Limited defaulting in the ambiguity check] * Concreteness checks: there is some extra faff to try to get decent error messages when the FRR (representation-polymorphism) checks fail. In partiular, add a "When unifying..." explanation when the representation-polymorphism check arose from another constraint. - - - - - 86406f48 by Cheng Shao at 2025-05-20T09:19:47-04:00 rts: fix rts_clearMemory logic when sanity checks are enabled This commit fixes an RTS assertion failure when invoking rts_clearMemory with +RTS -DS. -DS implies -DZ which asserts that free blocks contain 0xaa as the designated garbage value. Also adds the sanity way to rts_clearMemory test to prevent future regression. Closes #26011. ChatGPT Codex automatically diagnosed the issue and proposed the initial patch in a single shot, given a GHC checkout and the following prompt: --- Someone is reporting the following error when attempting to use `rts_clearMemory` with the RTS option `-DS`: ``` test.wasm: internal error: ASSERTION FAILED: file rts/sm/Storage.c, line 1216 (GHC version 9.12.2.20250327 for wasm32_unknown_wasi) Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug ``` What's the culprit? How do I look into this issue? --- I manually reviewed & revised the patch, tested and submitted it. - - - - - 7147370b by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: do not allocate strings in bytecode assembler This patch refactors the compiler to avoid allocating iserv buffers for BCONPtrStr at assemble-time. Now BCONPtrStr ByteStrings are recorded as a part of CompiledByteCode, and actual allocation only happens at link-time. This refactoring is necessary for adding bytecode serialization functionality, as explained by the revised comments in this commit. - - - - - a67db612 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: make bc_strs serializable This commit makes the bc_strs field in CompiledByteCode serializable; similar to previous commit, we preserve the ByteString directly and defer the actual allocation to link-time, as mentioned in updated comment. - - - - - 5faf34ef by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: make bc_itbls serializable This commit makes bc_itbls in CompiledByteCode serializable. A dedicated ConInfoTable datatype has been added in ghci which is the recipe for dynamically making a datacon's info table, containing the payload of the MkConInfoTable iserv message. - - - - - 2abaf8c1 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: remove FFIInfo bookkeeping in BCO This commit removes the bc_ffis field from CompiledByteCode completely, as well as all the related bookkeeping logic in GHC.StgToByteCode. bc_ffis is actually *unused* in the rest of GHC codebase! It is merely a list of FFIInfo, which is just a remote pointer of the libffi ffi_cif struct; once we allocate the ffi_cif struct and put its pointer in a CCALL instruction, we'll never free it anyway. So there is no point of bookkeeping. - - - - - adb9e4d2 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: make FFIInfo serializable in BCO This commit makes all the FFIInfo needed in CCALL instructions serializable. Previously, when doing STG to BCO lowering, we would allocate a libffi ffi_cif struct and keep its remote pointer as FFIInfo; but actually we can just keep the type signature as FFIInfo and defer the actual allocation to link-time. - - - - - 200f401b by Cheng Shao at 2025-05-20T17:22:19-04:00 ghci: remove redundant NewBreakModule message This commit removes the redundant NewBreakModule message from ghci: it just allocates two strings! This functionality can be implemented with existing MallocStrings in one iserv call. - - - - - ddaadca6 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: make breakpoint module name and unit id serializable This commit makes breakpoint module name and unit id serializable, in BRK_FUN instructions as well as ModBreaks. We can simply keep the module name and unit ids, and defer the buffer allocation to link time. - - - - - a0fde202 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: remove unused newModule This commit removes the now unused newModule function from GHC. - - - - - 68c8f140 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: add BCONPtrFS for interned top level string literals in BCO This commit adds BCONPtrFS as a BCO non-pointer literal kind, which has the same semantics of BCONPtrStr, except it contains a FastString instead of a ByteString. By using BCONPtrFS to represent top level string literals that are already FastString in the compilation pipeline, we enjoy the FastString interning logic and avoid allocating a bunch of redundant ByteStrings for the same FastStrings, especially when we lower the BRK_FUN instruction. - - - - - f2b532bc by Peng Fan at 2025-05-20T17:23:15-04:00 hadrian: enable GHCi for loongarch64 - - - - - 8ded2330 by kwxm at 2025-05-20T17:24:07-04:00 Fix bugs in `integerRecipMod` and `integerPowMod` This fixes #26017. * `integerRecipMod x 1` now returns `(# 1 | #)` for all x; previously it incorrectly returned `(# | () #)`, indicating failure. * `integerPowMod 0 e m` now returns `(# | () #)` for e<0 and m>1, indicating failure; previously it incorrectly returned `(# 0 | #)`. - - - - - c9abb87c by Andreas Klebinger at 2025-05-20T17:24:50-04:00 Specialise: Don't float out constraint components. It was fairly complex to do so and it doesn't seem to improve anything. Nofib allocations were unaffected as well. See also Historical Note [Floating dictionaries out of cases] - - - - - 202b201c by Andreas Klebinger at 2025-05-21T10:16:14-04:00 Interpreter: Add limited support for direct primop evaluation. This commit adds support for a number of primops directly to the interpreter. This avoids the indirection of going through the primop wrapper for those primops speeding interpretation of optimized code up massively. Code involving IntSet runs about 25% faster with optimized core and these changes. For core without breakpoints it's even more pronouced and I saw reductions in runtime by up to 50%. Running GHC itself in the interpreter was sped up by ~15% through this change. Additionally this comment does a few other related changes: testsuite: * Run foundation test in ghci and ghci-opt ways to test these primops. * Vastly expand the foundation test to cover all basic primops by comparing result with the result of calling the wrapper. Interpreter: * When pushing arguments for interpreted primops extend each argument to at least word with when pushing. This avoids some issues with big endian. We can revisit this if it causes performance issues. * Restructure the stack chunk check logic. There are now macros for read accesses which might cross stack chunk boundries and macros which omit the checks which are used when we statically know we access an address in the current stack chunk. - - - - - 67a177b4 by sheaf at 2025-05-21T10:17:04-04:00 QuickLook: do a shape test before unifying This commit ensures we do a shape test before unifying. This ensures we don't try to unify a TyVarTv with a non-tyvar, e.g. alpha[tyv] := Int On the way, we refactor simpleUnifyCheck: 1. Move the checkTopShape check into simpleUnifyCheck 2. Refactors simpleUnifyCheck to return a value of the new type SimpleUnifyResult type. Now, simpleUnifyCheck returns "can unify", "cannot unify" or "dunno" (with "cannot unify" being the new result it can return). Now: - touchabilityTest is included; it it fails we return "cannot unify" - checkTopShape now returns "cannot unify" instead of "dunno" upon failure 3. Move the call to simpleUnifyCheck out of checkTouchableTyVarEq. After that, checkTouchableTyVarEq becames a simple call to checkTyEqRhs, so we inline it. This allows the logic in canEqCanLHSFinish_try_unification to be simplified. In particular, we now avoid calling 'checkTopShape' twice. Two further changes suggested by Simon were also implemented: - In canEqCanLHSFinish, if checkTyEqRhs returns PuFail with 'do_not_prevent_rewriting', we now **continue with this constraint**. This allows us to use the constraint for rewriting. - checkTyEqRhs now has a top-level check to avoid flattening a tyfam app in a top-level equality of the form alpha ~ F tys, as this is going around in circles. This simplifies the implementation without any change in behaviour. Fixes #25950 Fixes #26030 - - - - - 4020972c by sheaf at 2025-05-21T10:17:04-04:00 FixedRuntimeRepError: omit unhelpful explanation This commit tweaks the FixedRuntimeRepError case of pprTcSolverReportMsg, to avoid including an explanation which refers to a type variable that appears nowhere else. For example, the old error message could look like the following: The pattern binding does not have a fixed runtime representation. Its type is: T :: TYPE R Cannot unify ‘R’ with the type variable ‘c0’ because the former is not a concrete ‘RuntimeRep’. With this commit, we now omit the last two lines, because the concrete type variable (here 'c0') does not appear in the type displayed to the user (here 'T :: TYPE R'). - - - - - 6d058a69 by Andrea Bedini at 2025-05-21T16:00:51-04:00 Don't fail when ghcversion.h can't be found (#26018) If ghcversion.h can't be found, don't try to include it. This happens when there is no rts package in the package db and when -ghcversion-file argument isn't passed. Co-authored-by: Syvlain Henry - - - - - b1212fbf by Vladislav Zavialov at 2025-05-21T16:01:33-04:00 Implement -Wpattern-namespace-specifier (#25900) In accordance with GHC Proposal #581 "Namespace-specified imports", section 2.3 "Deprecate use of pattern in import/export lists", the `pattern` namespace specifier is now deprecated. Test cases: T25900 T25900_noext - - - - - e650ec3e by Ben Gamari at 2025-05-23T03:42:46-04:00 base: Forward port changelog language from 9.12 - - - - - 94cd9ca4 by Ben Gamari at 2025-05-23T03:42:46-04:00 base: Fix RestructuredText-isms in changelog - - - - - 7722232c by Ben Gamari at 2025-05-23T03:42:46-04:00 base: Note strictness changes made in 4.16.0.0 Addresses #25886. - - - - - 3f4b823c by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker: Factor out ProddableBlocks machinery - - - - - 6e23fef2 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker: Improve efficiency of proddable blocks structure Previously the linker's "proddable blocks" check relied on a simple linked list of spans. This resulted in extremely poor complexity while linking objects with lots of small sections (e.g. objects built with split sections). Rework the mechanism to instead use a simple interval set implemented via binary search. Fixes #26009. - - - - - ea74860c by Ben Gamari at 2025-05-23T03:43:28-04:00 testsuite: Add simple functional test for ProddableBlockSet - - - - - 74c4db46 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker/PEi386: Drop check for LOAD_LIBRARY_SEARCH_*_DIRS The `LOAD_LIBRARY_SEARCH_USER_DIRS` and `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS` were introduced in Windows Vista and have been available every since. As we no longer support Windows XP we can drop this check. Addresses #26009. - - - - - 972d81d6 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker/PEi386: Clean up code style - - - - - 8a1073a5 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/Hash: Factor out hashBuffer This is a useful helper which can be used for non-strings as well. - - - - - 44f509f2 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker/PEi386: Fix incorrect use of break in nested for Previously the happy path of PEi386 used `break` in a double-`for` loop resulting in redundant calls to `LoadLibraryEx`. Fixes #26052. - - - - - bfb12783 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts: Correctly mark const arguments - - - - - 08469ff8 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker/PEi386: Don't repeatedly load DLLs Previously every DLL-imported symbol would result in a call to `LoadLibraryEx`. This ended up constituting over 40% of the runtime of `ghc --interactive -e 42` on Windows. Avoid this by maintaining a hash-set of loaded DLL names, skipping the call if we have already loaded the requested DLL. Addresses #26009. - - - - - 823d1ccf by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker: Expand comment describing ProddableBlockSet - - - - - e9de9e0b by Sylvain Henry at 2025-05-23T15:12:34-04:00 Remove emptyModBreaks Remove emptyModBreaks and track the absence of ModBreaks with `Maybe ModBreaks`. It avoids testing for null pointers... - - - - - 17db44c5 by Ben Gamari at 2025-05-23T15:13:16-04:00 base: Expose Backtraces constructor and fields This was specified in the proposal (CLC #199) yet somehow didn't make it into the implementation. Fixes #26049. - - - - - b08c08ae by soulomoon at 2025-05-28T01:57:23+08:00 Refactor handling of imported COMPLETE pragmas from the HPT Previously, we imported COMPLETE pragmas from all modules in the Home Package Table (HPT) during type checking. However, since !13675, there may be non-below modules in the HPT from the dependency tree that we do not want to import COMPLETE pragmas from. This refactor changes the way we handle COMPLETE pragmas from the HPT to only import them from modules that are "below" the current module in the HPT. - Add hugCompleteSigsBelow to filter COMPLETE pragmas from "below" modules in the HPT, mirroring hugRulesBelow. - Move responsibility for calling hugCompleteSigsBelow to tcRnImports, storing the result in the new tcg_complete_match_env field of TcGblEnv. - Update getCompleteMatchesTcM to use tcg_complete_match_env. This refactor only affects how COMPLETE pragmas are imported from the HPT, imports from external packages are unchanged. - - - - - 16014bf8 by Hécate Kleidukos at 2025-05-28T20:09:34-04:00 Expose all of Backtraces' internals for ghc-internal Closes #26049 - - - - - a0adc30d by Ryan Hendrickson at 2025-05-30T14:12:52-04:00 haddock: Fix links to type operators - - - - - 7b64697c by Mario Blažević at 2025-05-30T14:13:41-04:00 Introduce parenBreakableList and use it in ppHsContext - - - - - 5f213bff by fendor at 2025-06-02T09:16:24+02:00 Make GHCi commands compatible with multiple home units === Design We enable all GHCi features that were previously guarded by the `inMulti` option. GHCi supported multiple home units up to a certain degree for quite a while now. The supported feature set was limited, due to a design impasse: One of the home units must be "active", e.g., there must be one `HomeUnit` whose `UnitId` is "active" which is returned when calling ```haskell do hscActiveUnitId <$> getSession ``` This makes sense in a GHC session, since you are always compiling a particular Module, but it makes less intuitive sense in an interactive session. Given an expression to evaluate, we can't easily tell in which "context" the expression should be parsed, typechecked and evaluated. That's why initially, most of GHCi features, except for `:reload`ing were disabled if the GHCi session had more than one `HomeUnitEnv`. We lift this restriction, enabling all features of GHCi for the multiple home unit case. To do this, we fundamentally change the `HomeUnitEnv` graph to be multiple home unit first. Instead of differentiating the case were we have a single home unit and multiple, we now always set up a multiple home unit session that scales seamlessly to an arbitrary amount of home units. We introduce two new `HomeUnitEnv`s that are always added to the `HomeUnitGraph`. They are: The "interactive-ghci", called the `interactiveGhciUnit`, contains the same `DynFlags` that are used by the `InteractiveContext` for interactive evaluation of expressions. This `HomeUnitEnv` is only used on the prompt of GHCi, so we may refer to it as "interactive-prompt" unit. See Note [Relation between the `InteractiveContext` and `interactiveGhciUnitId`] for discussing its role. And the "interactive-session"", called `interactiveSessionUnit` or `interactiveSessionUnitId`, which is used for loading Scripts into GHCi that are not `Target`s of any home unit, via `:load` or `:add`. Both of these "interactive" home units depend on all other `HomeUnitEnv`s that are passed as arguments on the cli. Additionally, the "interactive-ghci" unit depends on `interactive-session`. We always evaluate expressions in the context of the "interactive-ghci" session. Since "interactive-ghci" depends on all home units, we can import any `Module` from the other home units with ease. As we have a clear `HomeUnitGraph` hierarchy, we can set `interactiveGhciUnitId` as the active home unit for the full duration of the GHCi session. In GHCi, we always set `interactiveGhciUnitId` to be the currently active home unit. === Implementation Details Given this design idea, the implementation is relatively straight forward. The core insight is that a `ModuleName` is not sufficient to identify a `Module` in the `HomeUnitGraph`. Thus, large parts of the PR is simply about refactoring usages of `ModuleName` to prefer `Module`, which has a `Unit` attached and is unique over the `HomeUnitGraph`. Consequentially, most usages of `lookupHPT` are likely to be incorrect and have been replaced by `lookupHugByModule` which is keyed by a `Module`. In `GHCi/UI.hs`, we make sure there is only one location where we are actually translating `ModuleName` to a `Module`: * `lookupQualifiedModuleName` If a `ModuleName` is ambiguous, we detect this and report it to the user. To avoid repeated lookups of `ModuleName`s, we store the `Module` in the `InteractiveImport`, which additionally simplifies the interface loading. A subtle detail is that the `DynFlags` of the `InteractiveContext` are now stored both in the `HomeUnitGraph` and in the `InteractiveContext`. In UI.hs, there are multiple code paths where we are careful to update the `DynFlags` in both locations. Most importantly in `addToProgramDynFlags`. --- There is one metric increase in this commit: ------------------------- Metric Increase: T4029 ------------------------- It is an increase from 14.4 MB to 16.1 MB (+11.8%) which sounds like a pretty big regression at first. However, we argue this increase is solely caused by using more data structures for managing multiple home units in the GHCi session. In particular, due to the design decision of using three home units, the base memory usage increases... but by how much? A big contributor is the `UnitState`, of which we have three now, which on its own 260 KB per instance. That makes an additional memory usage of 520 KB, already explaining a third of the overall memory usage increase. Then we store more elements in the `HomeUnitGraph`, we have more `HomeUnitEnv` entries, etc... While we didn't chase down each byte, we looked at the memory usage over time for both `-hi` and `-hT` profiles and can say with confidence while the memory usage increased slightly, we did not introduce any space leak, as the graph looks almost identical as the memory usage graph of GHC HEAD. --- Adds testcases for GHCi multiple home units session * Test truly multiple home unit sessions, testing reload logic and code evaluation. * Test that GHCi commands such as `:all-types`, `:browse`, etc., work * Object code reloading for home modules * GHCi debugger multiple home units session - - - - - de603d01 by fendor at 2025-06-02T09:16:24+02:00 Update "loading compiled code" GHCi documentation To use object code in GHCi, the module needs to be compiled for use in GHCi. To do that, users need to compile their modules with: * `-dynamic` * `-this-unit-id interactive-session` Otherwise, the interface files will not match. - - - - - b255a8ca by Vladislav Zavialov at 2025-06-02T16:00:12-04:00 docs: Fix code example for NoListTuplePuns Without the fix, the example produces an error: Test.hs:11:3: error: [GHC-45219] • Data constructor ‘Tuple’ returns type ‘Tuple2 a b’ instead of an instance of its parent type ‘Tuple a’ • In the definition of data constructor ‘Tuple’ In the data type declaration for ‘Tuple’ Fortunately, a one line change makes it compile. - - - - - 6558467c by Ryan Hendrickson at 2025-06-06T05:46:58-04:00 haddock: Parse math even after ordinary characters Fixes a bug where math sections were not recognized if preceded by a character that isn't special (like space or a markup character). - - - - - 265d0024 by ARATA Mizuki at 2025-06-06T05:47:48-04:00 AArch64 NCG: Fix sub-word arithmetic right shift As noted in Note [Signed arithmetic on AArch64], we should zero-extend sub-word values. Fixes #26061 - - - - - 05e9be18 by Simon Hengel at 2025-06-06T05:48:35-04:00 Allow Unicode in "message" and "hints" with -fdiagnostics-as-json (fixes #26075) - - - - - bfa6b70f by ARATA Mizuki at 2025-06-06T05:49:24-04:00 x86 NCG: Fix code generation of bswap64 on i386 Co-authored-by: sheaf Fix #25601 - - - - - 35826d8b by Matthew Pickering at 2025-06-08T22:00:41+01:00 Hadrian: Add option to generate .hie files for stage1 libraries The +hie_files flavour transformer can be enabled to produce hie files for stage1 libraries. The hie files are produced in the "extra-compilation-artifacts" folder and copied into the resulting bindist. At the moment the hie files are not produced for the release flavour, they add about 170M to the final bindist. Towards #16901 - - - - - e2467dbd by Ryan Hendrickson at 2025-06-09T13:07:05-04:00 Fix various failures to -fprint-unicode-syntax - - - - - 1d99d3e4 by maralorn at 2025-06-12T03:47:39-04:00 Add necessary flag for js linking - - - - - 974d5734 by maralorn at 2025-06-12T03:47:39-04:00 Don’t use additional linker flags to detect presence of -fno-pie in configure.ac This mirrors the behavior of ghc-toolchain - - - - - 1e9eb118 by Andrew Lelechenko at 2025-06-12T03:48:21-04:00 Add HasCallStack to Control.Monad.Fail.fail CLC proposal https://github.com/haskell/core-libraries-committee/issues/327 2% compile-time allocations increase in T3064, likely because `fail` is now marginally more expensive to compile. Metric Increase: T3064 - - - - - 6d12060f by meooow25 at 2025-06-12T14:26:07-04:00 Bump containers submodule to 0.8 Also * Disable -Wunused-imports for containers * Allow containers-0.8 for in-tree packages * Bump some submodules so that they allow containers-0.8. These are not at any particular versions. * Remove unused deps containers and split from ucd2haskell * Fix tests affected by the new containers and hpc-bin - - - - - 537bd233 by Peng Fan at 2025-06-12T14:27:02-04:00 NCG/LA64: Optimize code generation and reduce build-directory size. 1. makeFarBranches: Prioritize fewer instruction sequences. 2. Prefer instructions with immediate numbers to reduce register moves, e.g. andi,ori,xori,addi. 3. Ppr: Remove unnecessary judgments. 4. genJump: Avoid "ld+jr" as much as possible. 5. BCOND and BCOND1: Implement conditional jumps with two jump ranges, with limited choice of the shortest. 6. Implement FSQRT, CLT, CTZ. 7. Remove unnecessary code. - - - - - a1e2d814 by Matthew Pickering at 2025-06-13T12:12:48+01:00 Move ModuleGraph into UnitEnv The ModuleGraph is a piece of information associated with the ExternalPackageState and HomeUnitGraph. Therefore we should store it inside the HomeUnitEnv. - - - - - 1116 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/generate-ci/gen_ci.hs - .gitlab/hello.hs - .gitlab/jobs.yaml - compiler/CodeGen.Platform.h - compiler/GHC.hs - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Linker.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/CLabel.hs - compiler/GHC/Cmm/Lint.hs - compiler/GHC/Cmm/MachOp.hs - compiler/GHC/Cmm/Type.hs - compiler/GHC/CmmToAsm.hs - compiler/GHC/CmmToAsm/AArch64/CodeGen.hs - compiler/GHC/CmmToAsm/AArch64/Instr.hs - compiler/GHC/CmmToAsm/AArch64/Ppr.hs - compiler/GHC/CmmToAsm/Config.hs - compiler/GHC/CmmToAsm/Dwarf/Constants.hs - + compiler/GHC/CmmToAsm/LA64.hs - + compiler/GHC/CmmToAsm/LA64/CodeGen.hs - + compiler/GHC/CmmToAsm/LA64/Cond.hs - + compiler/GHC/CmmToAsm/LA64/Instr.hs - + compiler/GHC/CmmToAsm/LA64/Ppr.hs - + compiler/GHC/CmmToAsm/LA64/RegInfo.hs - + compiler/GHC/CmmToAsm/LA64/Regs.hs - compiler/GHC/CmmToAsm/PIC.hs - compiler/GHC/CmmToAsm/RV64/CodeGen.hs - compiler/GHC/CmmToAsm/RV64/Instr.hs - compiler/GHC/CmmToAsm/RV64/Ppr.hs - compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs - compiler/GHC/CmmToAsm/Reg/Linear.hs - compiler/GHC/CmmToAsm/Reg/Linear/AArch64.hs - compiler/GHC/CmmToAsm/Reg/Linear/FreeRegs.hs - + compiler/GHC/CmmToAsm/Reg/Linear/LA64.hs - compiler/GHC/CmmToAsm/Reg/Target.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToLlvm/Base.hs - compiler/GHC/CmmToLlvm/Data.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/InstEnv.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/Pipeline.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCo/Tidy.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/CoreToStg.hs - compiler/GHC/Data/Graph/Directed/Reachability.hs - compiler/GHC/Driver/Backend.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Config/CmmToAsm.hs - + compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Errors/Ppr.hs - compiler/GHC/Driver/Errors/Types.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Make.hs - + compiler/GHC/Driver/MakeAction.hs - compiler/GHC/Driver/MakeFile.hs - + compiler/GHC/Driver/Messager.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline.hs-boot - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Session.hs - + compiler/GHC/Driver/Session/Units.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Extension.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Breakpoints.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/HsToCore/Usage.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Make.hs - compiler/GHC/Iface/Recomp.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Linker/Deps.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/Errors/Ppr.hs - compiler/GHC/Parser/Errors/Types.hs - compiler/GHC/Parser/Header.hs - compiler/GHC/Parser/Lexer.x - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - compiler/GHC/Parser/String.hs - compiler/GHC/Platform/LoongArch64.hs → compiler/GHC/Platform/LA64.hs - compiler/GHC/Platform/Regs.hs - compiler/GHC/Rename/Bind.hs - compiler/GHC/Rename/Env.hs - 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