Andrea Vezzosi pushed to branch wip/andrea/gbc-backport at Glasgow Haskell Compiler / GHC Commits: 270613a6 by Cheng Shao at 2026-09-03T10:37:32+02:00 compiler: only use `Name` instead of `Id` in `SptEntry` As a part of #26298, this patch refactors `SptEntry` to only carry a `Name` instead of `Id`: we do not care about extra information like caffyness or type at all in any static pointer related codegen logic. This is necessary to make `SptEntry` serializable, as a part of the grand plan of serializable bytecode. Co-authored-by: Codex <codex@openai.com> (cherry picked from commit 39b2e3823da3ab168aa2b7365f0f27e01b1ecd0e) - - - - - 4623b595 by Oleg Grenrus at 2026-09-03T10:37:32+02:00 Generalise thNameToGhcName by adding HasHscEnv There were multiple single monad-specific `getHscEnv` across codebase. HasHscEnv is modelled on HasDynFlags. My first idea was to simply add thNameToGhcNameHsc and thNameToGhcNameTc, but those would been exactly the same as thNameToGhcName already. Also add an usage example to thNameToGhcName and mention that it's recommended way of looking up names in GHC plugins (cherry picked from commit eb2ab1e2cadde93c330330ca7fdc64b31cd61473) - - - - - df10ae15 by Simon Peyton Jones at 2026-09-03T10:37:32+02:00 Refactor ForAllCo This is a pure refactor, addressing #26389. It arranges that the kind coercion in a ForAllCo is a MCoercion, rather than a plain Coercion, thus removing redundancy in the common case. See (FC8) in Note [ForAllCo] It's a nice cleanup. (cherry picked from commit 94b62aa7e7b40b53442161a0c4f380955fda2f14) - - - - - b2f45031 by Cheng Shao at 2026-09-03T10:38:16+02:00 compiler/ghci: replace the LoadDLL message with LoadDLLs As a part of #25407, this commit changes the LoadDLL message to LoadDLLs, which takes a list of DLL paths to load and returns the list of remote pointer handles. The wasm dyld is refactored to take advantage of LoadDLLs and harvest background parallelism. On other platforms, LoadDLLs is based on a fallback codepath that does sequential loading. The driver is not actually emitting singular LoadDLLs message with multiple DLLs yet, this is left in subsequent commits. Co-authored-by: Codex <codex@openai.com> (cherry picked from commit a4d664c78642438f0f178ffa243e2ffdbdf20397) - - - - - 9c512d0e by Cheng Shao at 2026-09-03T10:38:20+02:00 driver: separate downsweep/upsweep phase in loadPackages' This commit refactors GHC.Linker.Loader.loadPackages' to be separated into downsweep/upsweep phases: - The downsweep phase performs dependency analysis and generates a list of topologically sorted packages to load - The upsweep phase sequentially loads these packages by calling loadPackage This is a necessary refactoring to make it possible to make loading of DLLs concurrent. (cherry picked from commit c7fc4baeddcfad500126b2e91ce94d2b9391560d) - - - - - a8d284ea by Cheng Shao at 2026-09-03T10:38:20+02:00 driver: emit single LoadDLLs message to load multiple DLLs This commit refactors the driver so that it emits a single LoadDLLs message to load multiple DLLs in GHC.Linker.Loader.loadPackages'. Closes #25407. ------------------------- Metric Increase: MultiLayerModulesTH_OneShot TcPlugin_RewritePerf ------------------------- Co-authored-by: Codex <codex@openai.com> (cherry picked from commit ab180104b61a930e8a1e906f013c151669ce6fff) - - - - - 4af2e65a by Matthew Pickering at 2026-09-03T10:38:20+02:00 driver: Load bytecode static pointer entries during linking Previously the entries were loaded too eagerly, during upsweep, but we should delay loading them until we know that the relevant bytecode object is demanded. Towards #25230 (cherry picked from commit e9445c013fbccf9318739ca3d095a3e0a2e1be8a) - - - - - 6cf584e3 by Matthew Pickering at 2026-09-03T10:38:20+02:00 loader: Unify loadDecls and loadModuleLinkables functions These two functions nearly did the same thing. I have refactored them so that `loadDecls` now calls `loadModuleLinkables`. Fixes #26459 (cherry picked from commit da9633a9009a08132b974b0407c4057cae3577f7) - - - - - 78023870 by Matthew Pickering at 2026-09-03T10:38:20+02:00 testsuite: Use ghci_ways to set ways in PackedDataCon/UnboxedTuples/UnliftedDataTypeInterp tests These tests reimplemented the logic from `valid_way` in order to determine what ways to run. It's easier to use this combination of `only_ways` and `extra_ways` to only run in GHCi ways and always run in GHCi ways. (cherry picked from commit 1275d3607299734228adbbc47bfb69bf8800279f) - - - - - 7b04a1b8 by Matthew Pickering at 2026-09-03T10:38:53+02:00 Rename interpreterBackend to bytecodeBackend This is preparation for creating bytecode files. The "interpreter" is one way in which we can run bytecode objects. It is more accurate to describe that the backend produces bytecode, rather than the means by which the code will eventually run. The "interpreterBackend" binding is left as a deprecated alias. (cherry picked from commit c06b534bbd6dbb570b760f2e82b3e375d3956bcf) - - - - - 7c5f98be by sheaf at 2026-09-03T10:38:57+02:00 Store SDoc context in SourceError This commits modifies the SourceError datatype which is used for throwing and then reporting exceptions by storing all the info we need to be able to print the SDoc, including whether we should print with explicit kinds, explicit runtime-reps, etc. This is done using the new datatype: data SourceErrorContext = SEC !DiagOpts !(DiagnosticOpts GhcMessage) Now, when we come to report an error (by handling the exception), we have access to the full context we need. Fixes #26387 (cherry picked from commit 129ce32d3a4f2601f5c2d1bbaeeb2fbaf8dc9ef9) - - - - - dbf79e13 by sheaf at 2026-09-03T10:38:57+02:00 Improvements to 'mayLookIdentical' This commit makes significant improvements to the machinery that decides when we should pretty-print the "invisible bits" of a type, such as: - kind applications, e.g. '@k' in 'Proxy @k ty' - RuntimeReps, e.g. 'TYPE r' - multiplicities and linear arrows 'a %1 -> b' To do this, this commit refactors 'mayLookIdentical' to return **which** of the invisible bits don't match up, e.g. in (a %1 -> b) ~ (a %Many -> b) we find that the invisible bit that doesn't match up is a multiplicity, so we should set 'sdocLinearTypes = True' when pretty-printing, and with e.g. Proxy @k1 ~ Proxy @k2 we find that the invisible bit that doesn't match up is an invisible TyCon argument, so we set 'sdocPrintExplicitKinds = True'. We leverage these changes to remove the ad-hoc treatment of linearity of data constructors with 'dataConDisplayType' and 'dataConNonLinearType'. This is now handled by the machinery of 'pprWithInvisibleBits'. Fixes #26335 #26340 (cherry picked from commit 2b8baada761b13199b99268f243bebd009e6e1b5) - - - - - b549d9c4 by Matthew Pickering at 2026-09-03T10:38:57+02:00 Add support for generating bytecode objects This commit adds the `-fwrite-byte-code` option which makes GHC emit a `.gbc` file which contains a serialised representation of bytecode. The bytecode can be loaded by the compiler to avoid having to reinterpret a module when using the bytecode interpreter (for example, in GHCi). There are also the new options: * -gbcdir=<DIR>: Specify the directory to place the gbc files * -gbcsuf=<suffix>: Specify the suffix for gbc files The option `-fbyte-code-and-object-code` now implies `-fwrite-byte-code`. These performance tests fail due to https://github.com/haskell/directory/issues/204 ------------------------- Metric Increase: MultiComponentModules MultiLayerModules MultiComponentModulesRecomp MultiLayerModulesRecomp MultiLayerModulesTH_Make MultiLayerModulesTH_OneShot T13701 ------------------------- The bytecode serialisation part was implemented by Cheng Shao Co-authored-by: Cheng Shao <terrorjack@type.dance> (cherry picked from commit 6bd8155c991cfce7cca594bc63ba8f6ca6751667) - - - - - 16e2d353 by Ben Gamari at 2026-09-03T10:38:57+02:00 rts: Eliminate uses of implicit constant arrays Folding of `const`-sized variable-length arrays to a constant-length array is a gnu extension which clang complains about. Closes #26502. (cherry picked from commit 0c00c9c3b4e9b8515d4839f2c1d7d771781dc6f4) - - - - - 24974d92 by Matthew Pickering at 2026-09-03T10:39:10+02:00 driver: Properly handle errors during LinkNode steps Previously we were not properly catching errors during the LinkNode step (see T9930fail test). This is fixed by wrapping the `LinkNode` action in `wrapAction`, the same handler which is used for module compilation. Fixes #26496 (cherry picked from commit 6c91582f915f80daff774db7738094bda6ab3b44) - - - - - 198fc051 by Sylvain Henry at 2026-09-03T10:39:21+02:00 Build external interpreter program on demand (#24731) This patch teaches GHC how to build the external interpreter program when it is missing. As long as we have the `ghci` library, doing this is trivial so most of this patch is refactoring for doing it sanely. (cherry picked from commit 55eab80d337e47decacbe979c29a1b7b47d0a872) - - - - - 74fbe765 by Matthew Pickering at 2026-09-03T10:39:29+02:00 Use 'OsPath' in getModificationTimeIfExists This part of the compiler is quite hot during recompilation checking in particular since the filepaths will be translated to a string. It is better to use the 'OsPath' native function, which turns out to be easy to do. (cherry picked from commit ef0dc33b2034fd91e11950751264e8b2e9f03fc4) - - - - - 425a31db by Georgios Karachalias at 2026-09-03T10:39:29+02:00 Use OsPath in PkgDbRef and UnitDatabase, not FilePath (cherry picked from commit fa3bd0a67eea13701d1b50053636f9645e999308) - - - - - add2f262 by Matthew Pickering at 2026-09-03T10:39:29+02:00 Add support for building bytecode libraries A bytecode library is a collection of bytecode files (.gbc) and a library which combines together additional object files. A bytecode library is created by invoking GHC with the `-bytecodelib` flag. A library can be created from in-memory `ModuleByteCode` linkables or by passing `.gbc` files as arguments on the command line. Fixes #26298 (cherry picked from commit e36a5fcbeaa33abb17707173c9d1e81730f85008) - - - - - d78ff1a0 by Matthew Pickering at 2026-09-03T10:39:29+02:00 Load bytecode libraries to satisfy package dependencies This commit allows you to use a bytecode library to satisfy a package dependency when using the interpreter. If a user enables `-fprefer-byte-code`, then if a package provides a bytecode library, that will be loaded and used to satisfy the dependency. The main change is to separate the relevant parts of the `LoaderState` into external and home package byte code. Bytecode is loaded into either the home package or external part (similar to HPT/EPS split), HPT bytecode can be unloaded. External bytecode is never unloaded. The unload function has also only been called with an empty list of "stable linkables" for a long time. It has been modified to directly implement a complete unloading of the home package bytecode linkables. At the moment, the bytecode libraries are found in the "library-dirs" field from the package description. In the future when `Cabal` implements support for "bytecode-library-dirs" field, we can read the bytecode libraries from there. No changes to the Cabal submodule are necessary at the moment. Four new tests are added in testsuite/tests/cabal, which generate fake package descriptions and test loading the libraries into GHCi. Fixes #26298 (cherry picked from commit 8f9ae3397dbcbb4b0bd7a574ffc6b1fbaa137b6c) - - - - - 239 changed files: - compiler/GHC.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/Linker.hs - + compiler/GHC/ByteCode/Serialize.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion.hs-boot - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/Monad.hs - compiler/GHC/Core/Reduction.hs - compiler/GHC/Core/TyCo/Compare.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Ppr.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCo/Subst.hs - compiler/GHC/Core/TyCo/Tidy.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/Data/FlatBag.hs - compiler/GHC/Data/OsPath.hs - compiler/GHC/Data/SmallArray.hs - compiler/GHC/Driver/Backend.hs - compiler/GHC/Driver/Backend/Internal.hs - compiler/GHC/Driver/Backpack.hs - + compiler/GHC/Driver/ByteCode.hs - compiler/GHC/Driver/CodeOutput.hs - compiler/GHC/Driver/Config/Finder.hs - + compiler/GHC/Driver/Config/Interpreter.hs - compiler/GHC/Driver/Config/Linker.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.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/MakeFile.hs - compiler/GHC/Driver/Messager.hs - compiler/GHC/Driver/Monad.hs - compiler/GHC/Driver/Phases.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Plugins.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore/Breakpoints.hs - compiler/GHC/HsToCore/Usage.hs - compiler/GHC/Iface/Decl.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Make.hs - compiler/GHC/Iface/Rename.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy/StaticPtrTable.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/IfaceToCore.hs - + compiler/GHC/Linker/ByteCode.hs - compiler/GHC/Linker/Config.hs - compiler/GHC/Linker/Deps.hs - compiler/GHC/Linker/Dynamic.hs - + compiler/GHC/Linker/Executable.hs - − compiler/GHC/Linker/ExtraObj.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Linker/MacOS.hs - compiler/GHC/Linker/Static.hs - compiler/GHC/Linker/Types.hs - compiler/GHC/Linker/Windows.hs - compiler/GHC/Parser/Header.hs - compiler/GHC/Plugins.hs - compiler/GHC/Runtime/Debugger.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Runtime/Interpreter.hs - + compiler/GHC/Runtime/Interpreter/C.hs - + compiler/GHC/Runtime/Interpreter/Init.hs - compiler/GHC/Settings.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToJS/StaticPtr.hs - compiler/GHC/SysTools/Tasks.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Splice.hs - compiler/GHC/Tc/Module.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/TyCl/Utils.hs - compiler/GHC/Tc/Types/CtLoc.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Utils/Unify.hs-boot - compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/SourceError.hs - compiler/GHC/Types/SptEntry.hs - compiler/GHC/Types/Tickish.hs - compiler/GHC/Types/TyThing/Ppr.hs - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/Finder/Types.hs - compiler/GHC/Unit/Home/PackageTable.hs - compiler/GHC/Unit/Info.hs - compiler/GHC/Unit/Module/Graph.hs - compiler/GHC/Unit/Module/Location.hs - compiler/GHC/Unit/Module/ModSummary.hs - compiler/GHC/Unit/Module/WholeCoreBindings.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Utils/Binary.hs - compiler/GHC/Utils/Error.hs - compiler/GHC/Utils/Misc.hs - 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testsuite/tests/ghci/should_run/UnliftedDataTypeInterp/unlifteddatatypeinterp.T - testsuite/tests/indexed-types/should_fail/T14887.stderr - testsuite/tests/linear/should_fail/T19361.stderr - testsuite/tests/perf/compiler/Makefile - + testsuite/tests/perf/compiler/MultiLayerModulesDefsGhciWithBytecodeFiles.script - testsuite/tests/perf/compiler/all.T - testsuite/tests/roles/should_compile/Roles13.stderr - testsuite/tests/rts/linker/T2615.hs - testsuite/tests/simplCore/should_compile/OpaqueNoCastWW.stderr - testsuite/tests/simplCore/should_compile/T17673.stderr - testsuite/tests/simplCore/should_compile/T18078.stderr - testsuite/tests/simplCore/should_compile/T18995.stderr - testsuite/tests/simplCore/should_compile/T19890.stderr - testsuite/tests/simplCore/should_compile/T21948.stderr - testsuite/tests/simplCore/should_compile/T21960.stderr - testsuite/tests/simplCore/should_compile/T24808.stderr - − testsuite/tests/simplCore/should_compile/T25713.stderr - testsuite/tests/simplCore/should_compile/T4201.stdout - testsuite/tests/simplCore/should_compile/T8331.stderr - testsuite/tests/simplStg/should_compile/T22840.stderr - testsuite/tests/typecheck/no_skolem_info/T20232.stderr - testsuite/tests/typecheck/should_fail/T11672.stderr - testsuite/tests/typecheck/should_fail/T12373.stderr - testsuite/tests/typecheck/should_fail/T15807.stderr - testsuite/tests/typecheck/should_fail/T16074.stderr - testsuite/tests/typecheck/should_fail/T18357a.stderr - testsuite/tests/typecheck/should_fail/T19627.stderr - testsuite/tests/typecheck/should_fail/T21530a.stderr - testsuite/tests/typecheck/should_fail/VisFlag1.stderr - utils/check-exact/Parsers.hs - utils/check-exact/Preprocess.hs - utils/ghc-pkg/Main.hs - utils/iserv/iserv.cabal.in - utils/jsffi/dyld.mjs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/0ea088334e51e9bf59f6969ac503f51... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/0ea088334e51e9bf59f6969ac503f51... You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help