Matthew Pickering pushed to branch wip/refactorLoadDecls at Glasgow Haskell Compiler / GHC Commits: e7df6cc0 by Simon Peyton Jones at 2025-09-23T14:34:39-04:00 Improve pretty printer for HsExpr Given a very deeply-nested application, it just kept printing deeper and deeper. This small change makes it cut off. Test is in #26330, but we also get a dramatic decrease in compile time for perf/compiler/InstanceMatching: InstanceMatching 4,086,884,584 1,181,767,232 -71.1% GOOD Why? Because before we got a GIGANTIC error message that took ages to pretty-print; now we get this much more civilised message (I have removed some whitespace.) Match.hs:1007:1: error: • No instance for ‘Show (F001 a)’ arising from a use of ‘showsPrec’ • In the second argument of ‘showString’, namely ‘(showsPrec 11 b1 (GHC.Internal.Show.showSpace (showsPrec 11 b2 (GHC.Internal.Show.showSpace (showsPrec 11 b3 (GHC.Internal.Show.showSpace (showsPrec 11 b4 (GHC.Internal.Show.showSpace (showsPrec 11 b5 (GHC.Internal.Show.showSpace (showsPrec 11 b6 (GHC.Internal.Show.showSpace (showsPrec ...)))))))))))))’ ----------------------- The main payload is * At the start of `pprExpr` * In the defn of `pprApp` A little bit of refactoring: * It turned out that we were setting the default cut-off depth to a fixed value in two places, so changing one didn't change the other. See defaultSDocDepth and defaultSDocCols * I refactored `pprDeeperList` a bit so I could understand it better. Because the depth calculation has changed, there are lots of small error message wibbles. Metric Decrease: InstanceMatching - - - - - 209f0158 by Simon Peyton Jones at 2025-09-23T14:34:39-04:00 Use Outputable.ellipsis rather than text "..." - - - - - 64bb0e37 by Sylvain Henry at 2025-09-23T14:35:56-04:00 deriveConstants: automatically pass -fcommon CC flag (#26393) By mistake we tried to use deriveConstants without passing `--gcc-flag -fcommon` (which Hadrian does) and it failed. This patch: 1. adds parsing support for constants stored in the .bss section (i.e. when -fcommon isn't passed) 2. enables passing `-fcommon` automatically to the C compiler because Windows requires this for subtle reasons 3. Documents the subtle reasons (1) isn't strictly necessary because we always do (2) but it does no harm and it is still useful if the CC flags ever contain -fno-common - - - - - afcdf92f by Oleg Grenrus at 2025-09-23T14:36:41-04:00 Don't wrap spaces in <span>s Doing similar comparison as in 63189b2ceca07edf4e179f4180ca60d470c62cb3 With this change the gzipped documentation is now 2% smaller (previously 1%) 12_694_206 Agda-2.9.0-docs-orig.tar.gz 12_436_829 Agda-2.9.0-docs.tar.gz Unzipped docs are 5% smaller (previously 3%) 178M Agda-2.9.0-docs-orig 169M Agda-2.9.0-docs Individual hyperlinked sources are around 7-10% smaller (previously 5%) (`Parser` module is generated by happy and has relatively little whitespace) 14_230_117 Agda.Syntax.Parser.Parser.html 13_220_758 Agda.Syntax.Parser.Parser.html Agda's hyperlinked sources are 9% smaller now: 121M Agda-2.9.0-docs-orig/src 110M Agda-2.9.0-docs/src - - - - - 67de53a6 by Cheng Shao at 2025-09-23T14:37:31-04:00 rts: remove obsolete __GNUC__ related logic This patch removes obsolete `__GNUC__` related logic, given on any currently supported platform and toolchain, `__GNUC__ >= 4` is universally true. Also pulls some other weeds and most notably, use `__builtin___clear_cache` for clang as well, since clang has supported this gcc intrinsic since 2014, see https://github.com/llvm/llvm-project/commit/c491a8d4577052bc6b3b4c72a7db6a7c.... - - - - - c4d32493 by Sven Tennie at 2025-09-23T20:40:57-04:00 RV64: Fix: Add missing truncation to MO_S_Shr (#26248) Sub-double word (<W64) registers need to be truncated after the operation. - - - - - 41dce477 by Sven Tennie at 2025-09-23T20:40:57-04:00 RV64: Cleanup shift emitting cases/code Remove overlapping cases to make the shift logic easier to understand. - - - - - 0a601c30 by Alex Washburn at 2025-09-23T20:41:41-04:00 Correcting LLVM linking of Intel BMI intrinsics pdep{8,16} and pext{8,16}. This patch fixes #26065. The LLVM interface does not expose bindings to: - llvm.x86.bmi.pdep.8 - llvm.x86.bmi.pdep.16 - llvm.x86.bmi.pext.8 - llvm.x86.bmi.pext.16 So calls are instead made to llvm.x86.bmi.{pdep,pext}.32 in these cases, with pre/post-operation truncation to constrain the logical value range. - - - - - 89e8ff3d by Peng Fan at 2025-09-23T20:42:37-04:00 NCG/LA64: Implement MO_BSwap and MO_BRev with bit-manipulation Instructions - - - - - 50f6be09 by Sylvain Henry at 2025-09-23T20:43:29-04:00 Allow Core plugins to access unoptimized Core (#23337) Make the first simple optimization pass after desugaring a real CoreToDo pass. This allows CorePlugins to decide whether they want to be executed before or after this pass. - - - - - 30ef0aac by Simon Hengel at 2025-09-23T20:44:12-04:00 docs: Fix typo in scoped_type_variables.rst - - - - - f8919262 by Cheng Shao at 2025-09-23T20:44:54-04:00 ghci: fix bootstrapping with 9.12.3-rc1 and above This patch fixes bootstrapping GHC with 9.12.3-rc1 and above. ghci defines `Binary` instance for `HalfWord` in `ghc-heap`, which is a proper `newtype` in 9.14 and starting from 9.12.3. Given we don't build `ghc-heap` in stage0, we need to fix this predicate so that it corresponds to the boot ghc versions that contain the right version of `ghc-heap`. - - - - - a7f15858 by sheaf at 2025-09-24T09:49:53-04:00 User's guide: clarify optimisation of INLINABLE unfoldings This updates the user's guide section on INLINABLE pragmas to explain how the unfoldings of inlineable functions are optimised. The user's guide incorrectly stated that the RHS was not optimised at all, but this is not true. Instead, GHC is careful about phase control to optmise the RHS while retaining the guarantee that GHC behaves as if the original RHS had been written. - - - - - 495886d9 by Rodrigo Mesquita at 2025-09-24T09:50:35-04:00 cleanup: Delete historical artifact of COMPILING_WINDOWS_DLL Namely, drop the obsolete - DLL_IMPORT_RTS - DLL_IMPORT_DATA_VAR - DLL_IMPORT_DATA_VARNAME - DLL_IMPORT_DATA_REF These macros were not doing anything and placed inconsistently Looking at the git logs reveal these macros were used to support dynamic libraries on Win32, a feature that was dropped in b8cfa8f741729ef123569fb321c4b2ab4a1a941c This allows us to get rid of the rts/DLL.h file too. - - - - - 5ae89054 by Sylvain Henry at 2025-09-24T17:07:00-04:00 Allow disabling builtin rules (#20298) Add a way to disable built-in rules programmatically and with a debug flag. I also took the opportunity to add a debug flag to disable bignum rules, which was only possible programmatically (e.g. in a plugin). - - - - - 135242ca by Rodrigo Mesquita at 2025-09-24T17:07:44-04:00 Don't use build CFLAGS and friends as target settings In the GHC in tree configure, `CFLAGS`, `CXXFLAGS`, and similar tool configuration flags apply to the BUILD phase of the compiler, i.e. to the tools run to compile GHC itself. Notably, they should /not/ be carried over to the Target settings, i.e. these flags should /not/ apply to the tool which GHC invokes at runtime. Fixes #25637 - - - - - b418408b by Irene Knapp at 2025-09-25T09:47:54-04:00 Document etymology of "bind" as the name for `>>=` It took me twenty years of contemplation to realize why it's called that. I therefore feel that it may not be obvious to beginners. - - - - - e9c5e46f by Brandon Chinn at 2025-09-25T09:48:36-04:00 Fix tabs in string gaps (#26415) Tabs in string gaps were broken in bb030d0d because previously, string gaps were manually parsed, but now it's lexed by the usual Alex grammar and post-processed after successful lexing. It broke because of a discrepancy between GHC's lexer grammar and the Haskell Report. The Haskell Report includes tabs in whitechar: whitechar → newline | vertab | space | tab | uniWhite $whitechar used to include tabs until 18 years ago, when it was removed in order to exclude tabs from $white_no_nl in order to warn on tabs: 6e202120. In this MR, I'm adding \t back into $whitechar, and explicitly excluding \t from the $white_no_nl+ rule ignoring all whitespace in source code, which more accurately colocates the "ignore all whitespace except tabs, which is handled in the next line" logic. As a side effect of this MR, tabs are now allowed in pragmas; currently, a pragma written as {-# \t LANGUAGE ... #-} is interpreted as the tab character being the pragma name, and GHC warns "Unrecognized pragma". With this change, tabs are ignored as whitespace, which more closely matches the Report anyway. - - - - - 8bf5b309 by Cheng Shao at 2025-09-25T09:49:18-04:00 wasm: remove the --no-turbo-fast-api-calls hack from dynamic linker shebang This patch removes the `--no-turbo-fast-api-calls` hack from the dyld script shebang; it was used to workaround v8 fast call coredumps in nodejs and no longer needed, and comes with a performance penalty, hence the removal. - - - - - c1cab0c3 by Sylvain Henry at 2025-09-26T10:36:30-04:00 Revert "Add necessary flag for js linking" This reverts commit 84f68e2231b2eddb2e1dc4e90af394ef0f2e803f. This commit didn't have the expected effect. See discussion in #26290. Instead we export HEAP8 and HEAPU8 from rts/js/mem.js - - - - - 0a434a80 by Sylvain Henry at 2025-09-26T10:36:30-04:00 JS: export HEAPU8 (#26290) This is now required by newer Emscripten versions. - - - - - b10296a9 by Andreas Klebinger at 2025-09-26T10:37:11-04:00 sizeExpr: Improve Tick handling. When determining if we scrutinize a function argument we now properly look through ticks. Fixes #26444. - - - - - d9e2a9a7 by mniip at 2025-09-26T16:00:50-04:00 rts: Refactor parsing of -h flags We have a nontrivial amount of heap profiling flags available in the non-profiled runtime, so it makes sense to reuse the parsing code between the profiled and the non-profiled runtime, only restricting which flags are allowed. - - - - - 089e45aa by mniip at 2025-09-26T16:00:50-04:00 rts: Fix parsing of -h options with braces When the "filter by" -h options were introduced in bc210f7d267e8351ccb66972f4b3a650eb9338bb, the braces were mandatory. Then in 3c22fb21fb18e27ce8d941069a6915fce584a526, the braces were made optional. Then in d1ce35d2271ac8b79cb5e37677b1a989749e611c the brace syntax stopped working, and no one seems to have noticed. - - - - - 423f1472 by mniip at 2025-09-26T16:00:50-04:00 rts: add -hT<type> and -hi<table id> heap filtering options (#26361) They are available in non-profiled builds. Along the way fixed a bug where combining -he<era> and -hr<retainer> would ignore whether the retainer matches or not. - - - - - 4cda4785 by mniip at 2025-09-26T16:00:50-04:00 docs: Document -hT<type> and -hi<addr> - - - - - 982ad30f by mniip at 2025-09-26T16:00:50-04:00 rts: Refactor dumping the heap census Always do the printing of the total size right next to where the bucket label is printed. This prevents accidentally printing a label without the corresponding amount. Fixed a bug where exactly this happened for -hi profile and the 0x0 (uncategorized) info table. There is now also much more symmetry between fprintf(hp_file,...) and the corresponding traceHeapProfSampleString. - - - - - 8cbe006a by Cheng Shao at 2025-09-26T16:01:34-04:00 hadrian: fix GHC.Platform.Host generation for cross stage1 This patch fixes incorrectly GHC.Platform.Host generation logic for cross stage1 in hadrian (#26449). Also adds T26449 test case to witness the fix. Co-authored-by: Codex <codex@openai.com> - - - - - 0ddd0fdc by soulomoon at 2025-09-28T19:24:10-04:00 Remove hptAllInstances usage during upsweep Previously, during the upsweep phase when checking safe imports, we were loading the module interface with runTcInteractive, which in turn calls hptAllInstances. This accesses non-below modules from the home package table. Change the implementation of checkSafeImports to use initTcWithGbl and loadSysInterface to load the module interface, since we already have TcGblEnv at hand. This eliminates the unnecessary use of runTcInteractive and hptAllInstances during the upsweep phase. - - - - - e05c496c by Ben Gamari at 2025-09-28T19:24:59-04:00 base: Update changelog to reflect timing of IOPort# removal This change will make 9.14 afterall. - - - - - bdc9d130 by Cheng Shao at 2025-09-28T19:25:45-04:00 rts: fix wasm JSFFI initialization constructor code This commit fixes wasm JSFFI initialization constructor code so that the constructor is self-contained and avoids invoking a fake __main_argc_argv function. The previous approach of reusing __main_void logic in wasi-libc saves a tiny bit of code, at the expense of link-time trouble whenever GHC links a wasm module without -no-hs-main, in which case the driver-generated main function would clash with the definition here, resulting in a linker error. It's simply better to avoid messing with the main function, and it would additionally allow linking wasm32-wasi command modules that does make use of synchronous JSFFI. - - - - - 5d59fc8f by Cheng Shao at 2025-09-28T19:26:27-04:00 rts: provide stub implementations of ExecPage functions for wasm This patch provides stub implementations of ExecPage functions for wasm. They are never actually invoked at runtime for any non-TNTC platform, yet they can cause link-time errors of missing symbols when the GHCi.InfoTable module gets linked into the final wasm module (e.g. a GHC API program). - - - - - a4d664c7 by Cheng Shao at 2025-09-29T17:29:22+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> - - - - - c7fc4bae by Cheng Shao at 2025-09-29T17:29:22+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. - - - - - ab180104 by Cheng Shao at 2025-09-29T17:57:19+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> - - - - - 9c304ec0 by Sean D. Gillespie at 2025-09-29T19:57:07-04:00 Fix SIZED_BIN_OP_TY_INT casts in RTS interpreter Correct `SIZED_BIN_OP_TY_INT` cast to integer. Previously, it cast its second operand as its parameter `ty`. This does not currently cause any issues, since we are only using it for bit shifts. Fixes #26287 - - - - - a1de535f by Luite Stegeman at 2025-09-30T18:40:28-04:00 rts: Fix lost wakeups in threadPaused for threads blocked on black holes The lazy blackholing code in threadPaused could overwrite closures that were already eagerly blackholed, and as such wouldn't have a marked update frame. If the black hole was overwritten by its original owner, this would lead to an undetected collision, and the contents of any existing blocking queue being lost. This adds a check for eagerly blackholed closures and avoids overwriting their contents. Fixes #26324 - - - - - b7e21e49 by Luite Stegeman at 2025-09-30T18:40:28-04:00 rts: push the correct update frame in stg_AP_STACK The frame contains an eager black hole (__stg_EAGER_BLACKHOLE_info) so we should push an stg_bh_upd_frame_info instead of an stg_upd_frame_info. - - - - - 02a7c18a by Cheng Shao at 2025-09-30T18:41:27-04:00 ghci: fix lookupSymbolInDLL behavior on wasm This patch fixes lookupSymbolInDLL behavior on wasm to return Nothing instead of throwing. On wasm, we only have lookupSymbol, and the driver would attempt to call lookupSymbolInDLL first before falling back to lookupSymbol, so lookupSymbolInDLL needs to return Nothing gracefully for the fallback behavior to work. - - - - - aa0ca5e3 by Cheng Shao at 2025-09-30T18:41:27-04:00 hadrian/compiler: enable internal-interpreter for ghc library in wasm stage1 This commit enables the internal-interpreter flag for ghc library in wasm stage1, as well as other minor adjustments to make it actually possible to launch a ghc api session that makes use of the internal interpreter. Closes #26431 #25400. - - - - - 69503668 by Cheng Shao at 2025-09-30T18:41:27-04:00 testsuite: add T26431 test case This commit adds T26431 to testsuite/tests/ghci-wasm which goes through the complete bytecode compilation/linking/running pipeline in wasm, so to witness that the ghc shared library in wasm have full support for internal-interpreter. - - - - - e9445c01 by Matthew Pickering at 2025-09-30T18:42:23-04:00 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 - - - - - b8307eab by Cheng Shao at 2025-09-30T18:43:14-04:00 autoconf/ghc-toolchain: remove obsolete C99 check This patch removes obsolete c99 check from autoconf/ghc-toolchain. For all toolchain & platform combination we support, gnu11 or above is already supported without any -std flag required, and our RTS already required C11 quite a few years ago, so the C99 check is completely pointless. - - - - - 4be8710b by Matthew Pickering at 2025-10-01T09:16:57+01:00 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 - - - - - 175 changed files: - compiler/GHC.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/LA64/Instr.hs - compiler/GHC/CmmToAsm/LA64/Ppr.hs - compiler/GHC/CmmToAsm/RV64/CodeGen.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/Pipeline.hs - compiler/GHC/Core/Opt/Pipeline/Types.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/Rules/Config.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Driver/Config/Core/Rules.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/Plugins.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Errors/Ppr.hs - compiler/GHC/HsToCore/Pmc/Ppr.hs - compiler/GHC/HsToCore/Pmc/Types.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy/StaticPtrTable.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Linker/MacOS.hs - compiler/GHC/Linker/Types.hs - compiler/GHC/Llvm/Ppr.hs - compiler/GHC/Llvm/Types.hs - compiler/GHC/Parser/Lexer.x - compiler/GHC/Parser/Lexer/String.x - compiler/GHC/Runtime/Heap/Inspect.hs - compiler/GHC/Runtime/Interpreter.hs - compiler/GHC/Runtime/Interpreter/Types.hs - compiler/GHC/Runtime/Loader.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Types/Hint/Ppr.hs - compiler/GHC/Utils/Outputable.hs - compiler/GHC/Utils/Ppr.hs - configure.ac - distrib/configure.ac.in - docs/users_guide/debugging.rst - docs/users_guide/exts/pragmas.rst - docs/users_guide/exts/scoped_type_variables.rst - docs/users_guide/profiling.rst - hadrian/src/Rules/Generate.hs - hadrian/src/Settings/Builders/DeriveConstants.hs - hadrian/src/Settings/Packages.hs - libraries/base/changelog.md - libraries/ghc-internal/cbits/atomic.c - libraries/ghc-internal/cbits/ctz.c - libraries/ghc-internal/src/GHC/Internal/Base.hs - libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc - libraries/ghci/GHCi/Message.hs - libraries/ghci/GHCi/ObjLink.hs - libraries/ghci/GHCi/Run.hs - m4/fp_cmm_cpp_cmd_with_args.m4 - − m4/fp_set_cflags_c99.m4 - m4/fp_setup_windows_toolchain.m4 - m4/fptools_set_c_ld_flags.m4 - m4/ghc_toolchain.m4 - rts/Apply.cmm - rts/CloneStack.h - rts/ExecPage.c - rts/Interpreter.c - rts/Prelude.h - rts/ProfHeap.c - rts/RetainerSet.c - rts/RtsFlags.c - rts/RtsStartup.c - rts/RtsSymbols.c - rts/ThreadPaused.c - rts/include/Rts.h - rts/include/RtsAPI.h - rts/include/Stg.h - rts/include/rts/Flags.h - rts/include/rts/NonMoving.h - rts/include/rts/StableName.h - rts/include/rts/StablePtr.h - rts/include/rts/Types.h - − rts/include/stg/DLL.h - rts/include/stg/MiscClosures.h - rts/js/mem.js - rts/rts.cabal - rts/sm/BlockAlloc.c - rts/sm/Evac.h - rts/sm/Storage.c - rts/wasm/JSFFI.c - testsuite/driver/testlib.py - testsuite/tests/arrows/gadt/T17423.stderr - + testsuite/tests/codeGen/should_compile/T20298a.hs - + testsuite/tests/codeGen/should_compile/T20298a.stderr - 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