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[Git][ghc/ghc][wip/supersven/interpreter-flags] 137 commits: Configure: Fix check for --target support in stage0 CC
by Sven Tennie (＠supersven) 12 Apr '26

12 Apr '26

Sven Tennie pushed to branch wip/supersven/interpreter-flags at Glasgow Haskell Compiler / GHC Commits: 43638643 by Andreas Klebinger at 2026-03-15T18:15:48-04:00 Configure: Fix check for --target support in stage0 CC The check FP_PROG_CC_LINKER_TARGET used $CC unconditionally to check for --target support. However this fails for the stage0 config where the C compiler used is not $CC but $CC_STAGE0. Since we already pass the compiler under test into the macro I simply changed it to use that instead. Fixes #26999 - - - - - 18fd0df6 by Simon Hengel at 2026-03-15T18:16:33-04:00 Fix typo in recursive_do.rst - - - - - 86bd9bfc by fendor at 2026-03-17T23:46:09-04:00 Introduce `-fimport-loaded-targets` GHCi flag This new flag automatically adds all loaded targets to the GHCi session by adding an `InteractiveImport` for the loaded targets. By default, this flag is disabled, as it potentially increases memory-usage. This interacts with the flag `-fno-load-initial-targets` as follows: * If no module is loaded, no module is added as an interactive import. * If a reload loads up to a module, all loaded modules are added as interactive imports. * Unloading modules removes them from the interactive context. Fixes #26866 by rendering the use of a `-ghci-script` to achieve the same thing redundant. - - - - - e3d4c1bb by mniip at 2026-03-17T23:47:03-04:00 ghc-internal: Remove GHC.Internal.Data.Eq It served no purpose other than being a re-export. - - - - - 6f4f6cf0 by mniip at 2026-03-17T23:47:03-04:00 ghc-internal: Refine GHC.Internal.Base imports Removed re-exports from GHC.Internal.Base. This reveals some modules that don't actually use anything *defined* in GHC.Internal.Base, and that can be pushed down a little in the import graph. Replaced most imports of GHC.Internal.Base with non-wildcard imports from modules where the identifiers are actually defined. Part of #26834 Metric Decrease: T5321FD - - - - - 7fb51f54 by mangoiv at 2026-03-17T23:48:00-04:00 ci: clone, don't copy when creating the cabal cache Also removed WINDOWS_HOST variable detected via uname - we now just check whether the CI job has windows in its name. This works because we only ever care about it if the respective job is not a cross job. We also statically detect darwin cross jobs in the same way. We only ever have darwin -> darwin cross jobs so this is enough to detect the host reliably. - - - - - f8817879 by mangoiv at 2026-03-17T23:48:44-04:00 ci: mark size_hello_artifact fragile on darwin x86 The size of the x86_64 hello artifact is not stable which results in flaky testruns. Resolves #26814 - - - - - e34cb6da by Adam Gundry at 2026-03-20T12:20:00-04:00 ghci: Mention active language edition in startup banner Per GHC proposal 632, this makes the GHCi startup banner include the active language edition, plus an indication of whether this was the default (as opposed to being explicitly selected via an option such as `-XGHC2024`). For example: ``` $ ghci GHCi, version 9.14.1: https://www.haskell.org/ghc/ :? for help Using default language edition: GHC2024 ghci> ``` Fixes #26037. - - - - - 52c3e6ba by sheaf at 2026-03-20T12:21:09-04:00 Improve incomplete record selector warnings This commit stops GHC from emitting spurious incomplete record selector warnings for bare selectors/projections such as .fld There are two places we currently emit incomplete record selector warnings: 1. In the desugarer, when we see a record selector or an occurrence of 'getField'. Here, we can use pattern matching information to ensure we don't give false positives. 2. In the typechecker, which might sometimes give false positives but can emit warnings in cases that the pattern match checker would otherwise miss. This is explained in Note [Detecting incomplete record selectors] in GHC.HsToCore.Pmc. Now, we obviously don't want to emit the same error twice, and generally we prefer (1), as those messages contain fewer false positives. So we suppress (2) when we are sure we are going to emit (1); the logic for doing so is in GHC.Tc.Instance.Class.warnIncompleteRecSel, and works by looking at the CtOrigin. Now, the issue was that this logic handled explicit record selectors as well as overloaded record field selectors such as "x.r" (which turns into a simple GetFieldOrigin CtOrigin), but it didn't properly handle record projectors like ".fld" or ".fld1.fld2" (which result in other CtOrigins such as 'RecordFieldProjectionOrigin'). To solve this problem, we re-use the 'isHasFieldOrigin' introduced in fbdc623a (slightly adjusted). On the way, we also had to update the desugarer with special handling for the 'ExpandedThingTc' case in 'ds_app', to make sure that 'ds_app_var' sees all the type arguments to 'getField' in order for it to indeed emit warnings like in (1). Fixes #26686 - - - - - 309d7e87 by Cheng Shao at 2026-03-20T12:21:53-04:00 rts: opportunistically grow the MutableByteArray# in-place in resizeMutableByteArray# Following !15234, this patch improves `resizeMutableByteArray#` memory efficiency by growing the `MutableByteArray#` in-place if possible, addressing an old todo comment here. Also adds a new test case `resizeMutableByteArrayInPlace` that stresses this behavior. - - - - - 7d4ef162 by Matthew Craven at 2026-03-20T12:22:47-04:00 Change representation of floating point literals This commit changes the representation of floating point literals throughough the compiler, in particular in Core and Cmm. The Rational type is deficient for this purpose, dealing poorly with NaN, +/-Infinity, and negative zero. Instead, the new module GHC.Types.Literal.Floating uses the host Float/Double type to represent NaNs, infinities and negative zero. It also contains a Rational constructor, for the benefit of -fexcess-precision. Other changes: - Remove Note [negative zero] and related code This also removes the restrictions on constant-folding of division by zero, and should make any problems with NaN/Infinity more obvious. - Use -0.0 as the additive identity for Core constant folding rules for floating-point addition, fixing #21227. - Manual worker-wrapper for GHC.Float.rationalToDouble. This is intended to prevent the compiler's WW on this function from interfering with constant-folding. This change means that we now avoid allocating a box for the result of a 'realToFrac' call in T10359. - Combine floatDecodeOp and doubleDecodeOp. This change also fixes a bug in doubleDecodeOp wherein it would incorrectly produce an Int# instead of an Int64# literal for the mantissa component with 64-bit targets. - Use Float/Double for assembly immediates, and update the X86 and PowerPC backends to properly handle special values such as NaN and infinity. - Allow 'rational_to' to handle zero denominators, fixing a TODO in GHC.Core.Opt.ConstantFold. Fixes #8364 #9811 #18897 #21227 Progress towards #26919 Metric Decrease: T10359 Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> ------------------------- Metric Decrease: T1969 T5321FD ------------------------- - - - - - 80e2dd4f by Zubin Duggal at 2026-03-20T12:23:33-04:00 compiler/ffi: Collapse void pointer chains in capi wrappers New gcc/clang treat -Wincompatible-pointer-types as an error by default. Since C only allows implicit conversion from void*, not void**, capi wrappers for functions taking e.g. abstract** would fail to compile when the Haskell type Ptr (Ptr Abstract) was naively translated to void**. Collapse nested void pointers to a single void* when the pointee type has no known C representation. Fixes #26852 - - - - - 1c50bd7b by Luite Stegeman at 2026-03-20T12:24:37-04:00 Move some functions related to pointer tagging to a separate module - - - - - bfd7aafd by Luite Stegeman at 2026-03-20T12:24:37-04:00 Branchless unpacking for enumeration types Change unpacking for enumeration types to go to Word8#/Word16#/Word# directly instead of going through an intermediate unboxed sum. This allows us to do a branchless conversion using DataToTag and TagToEnum. Fixes #26970 - - - - - 72b20fc0 by Luite Stegeman at 2026-03-20T12:25:30-04:00 bytecode: Carefully SLIDE off the end of a stack chunk The SLIDE bytecode instruction was not checking for stack chunk boundaries and could corrupt the stack underflow frame, leading to crashes. We add a check to use safe writes if we cross the chunk boundary and also handle stack underflow if Sp is advanced past the underflow frame. fix #27001 - - - - - 2e22b43c by Cheng Shao at 2026-03-20T12:26:14-04:00 ghci: serialize BCOByteArray buffer directly when possible This patch changes the `Binary` instances of `BCOByteArray` to directly serialize the underlying buffer when possible, while also taking into account the issue of host-dependent `Word` width. See added comments and amended `Note [BCOByteArray serialization]` for detailed explanation. Closes #27020. - - - - - 89d9ba37 by Sylvain Henry at 2026-03-20T12:27:34-04:00 JS: replace BigInt with Number arithmetic for 32/64-bit quot/rem (#23597) Replace BigInt-based implementations of quotWord32, remWord32, quotRemWord32, quotRem2Word32, quotWord64, remWord64, quotInt64, and remInt64 with pure Number (double/integer) arithmetic to avoid the overhead of BigInt promotion. - - - - - ae4ddd60 by Sylvain Henry at 2026-03-20T12:28:28-04:00 Core: add constant-folding rules for Addr# eq/ne (#18032) - - - - - 3e767f98 by Matthew Pickering at 2026-03-20T12:29:11-04:00 Use OsPath rather than FilePath in Downsweep cache This gets us one step closure to uniformly using `OsPath` in the compiler. - - - - - 2c57de29 by Cheng Shao at 2026-03-20T12:29:55-04:00 hadrian: fix ghc-in-ghci flavour stage0 shared libraries This patch fixes missing stage0 shared libraries in hadrian ghc-in-ghci flavour, which was accidentally dropped in 669d09f950a6e88b903d9fd8a7571531774d4d5d and resulted in a regression in HLS support on linux/macos. Fixes #27057. - - - - - 5b1be555 by Sylvain Henry at 2026-03-20T12:30:48-04:00 JS: install rts/Types.h header file (#27033) It was an omission, making HsFFI.h not usable with GHC using the JS backend. - - - - - b883f08f by Cheng Shao at 2026-03-20T12:31:33-04:00 hadrian: don't compile RTS with -Winline This patch removes `-Winline` from cflags when compiling the RTS, given that: 1. It generates a huge pile of spam and hurts developer experience 2. Whether inlining happens is highly dependent on toolchains, flavours, etc, and it's not really an issue to fix if inlining doesn't happen; it's a hint to the C compiler anyway. Fixes #27060. - - - - - 333387d6 by Cheng Shao at 2026-03-20T12:31:33-04:00 hadrian: compile libffi-clib with -Wno-deprecated-declarations This patch adds `-Wno-deprecated-declarations` to cflags of `libffi-clib`, given that it produces noise at compile-time that aren't really our issue to fix anyway, it's from vendored libffi source code. - - - - - 67c47771 by Rodrigo Mesquita at 2026-03-20T12:32:17-04:00 Expose decodeStackWithIpe from ghc-experimental This decoding is useful to the debugger and it wasn't originally exported as an oversight. - - - - - 18513365 by Matthew Pickering at 2026-03-21T04:43:26-04:00 Add support for custom external interpreter commands It can be useful for GHC API clients to implement their own external interpreter commands. For example, the debugger may want an efficient way to inspect the stacks of the running threads in the external interpreter. - - - - - 4636d906 by mangoiv at 2026-03-21T04:44:10-04:00 ci: remove obsolete fallback for old debian and ubuntu versions - - - - - 2e3a2805 by mangoiv at 2026-03-21T04:44:10-04:00 ci: drop ubuntu 18 and 20 Ubuntu 18 EOL: May 2023 Ubuntu 20 EOL: May 2025 We should probably not make another major release supporting these platforms. Also updates the generator script. Resolves #25876 - - - - - de54e264 by Cheng Shao at 2026-03-21T17:52:08+01:00 rts: fix -Wcompare-distinct-pointer-types errors This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. - - - - - b9bd73de by Cheng Shao at 2026-03-21T17:52:08+01:00 ghc-internal: fix unused imports This commit fixes unused imports in `ghc-internal` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #26987 #27059. - - - - - da946a16 by Cheng Shao at 2026-03-21T17:03:51+00:00 ghci: fix unused imports This commit fixes unused imports in `ghci` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #26987 #27059. - - - - - 955b1cf8 by Cheng Shao at 2026-03-21T17:03:51+00:00 compiler: fix unused imports in GHC.Tc.Types.Origin This commit fixes unused imports in `GHC.Tc.Types.Origin` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #27059. - - - - - 3b1aeb50 by Cheng Shao at 2026-03-21T17:03:51+00:00 hadrian: fix missing +werror in validate flavour This patch fixes missing `+werror` in validate flavour, which was an oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066. - - - - - 44f118f0 by Cheng Shao at 2026-03-22T04:54:01-04:00 ci: bump CACHE_REV and add the missing reminder This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI errors due to stale cabal cache on some runners, and also adds a reminder to remind future maintainers. Fixes #27075. - - - - - 2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00 Add 128-bit SIMD support to AArch64 NCG Changes: - Add `Format` field to vector-capable instructions. These instructions will emit `vN.4s` (for example) as a operand. - Additional constructors for `Operand`: `OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example). `OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example). - Integer quot/rem are implemented in C, like x86. Closes #26536 Metric Increase: T3294 - - - - - 5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00 AArch64 NCG: Improve code generation for floating-point and vector constants Some floating-point constants can be directly encoded using the FMOV instruction. Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI. - - - - - c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00 Add regression test for #13729 Closes #13729. - - - - - aa5dfe67 by Sylvain Henry at 2026-03-26T03:48:56-04:00 Check that shift values are valid In GHC's codebase in non-DEBUG builds we silently substitute shiftL/R with unsafeShiftL/R for performance reasons. However we were not checking that the shift value was valid for unsafeShiftL/R, leading to wrong computations, but only in non-DEBUG builds. This patch adds the necessary checks and reports an error when a wrong shift value is passed. - - - - - c8a7b588 by Sylvain Henry at 2026-03-26T03:48:56-04:00 Implement basic value range analysis (#25718) Perform basic value range analysis to try to determine at compile time the result of the application of some comparison primops (ltWord#, etc.). This subsumes the built-in rewrite rules used previously to check if one of the comparison argument was a bound (e.g. (x :: Word8) <= 255 is always True). Our analysis is more powerful and handles type conversions: e.g. word8ToWord x <= 255 is now detected as always True too. We also use value range analysis to filter unreachable alternatives in case-expressions. To support this, we had to allow case-expressions for primitive types to not have a DEFAULT alternative (as was assumed before and checked in Core lint). - - - - - a5ec467e by ARATA Mizuki at 2026-03-26T03:49:49-04:00 rts: Align stack to 64-byte boundary in StgRun on x86 When LLVM spills AVX/AVX-512 vector registers to the stack, it requires 32-byte (__m256) or 64-byte (__m512) alignment. If the stack is not sufficiently aligned, LLVM inserts a realignment prologue that reserves %rbp as a frame pointer, conflicting with GHC's use of %rbp as an STG callee-saved register and breaking the tail-call-based calling convention. Previously, GHC worked around this by lying to LLVM about the stack alignment and rewriting aligned vector loads/stores (VMOVDQA, VMOVAPS) to unaligned ones (VMOVDQU, VMOVUPS) in the LLVM Mangler. This had two problems: - It did not extend to AVX-512, which requires 64-byte alignment. (#26595) - When Haskell calls a C function that takes __m256/__m512 arguments on the stack, the callee requires genuine alignment, which could cause a segfault. (#26822) This patch genuinely aligns the stack to 64 bytes in StgRun by saving the original stack pointer before alignment and restoring it in StgReturn. We now unconditionally advertise 64-byte stack alignment to LLVM for all x86 targets, making rewriteAVX in the LLVM Mangler unnecessary. STG_RUN_STACK_FRAME_SIZE is increased from 48 to 56 bytes on non-Windows x86-64 to store the saved stack pointer. Closes #26595 and #26822 Co-Authored-By: Claude Opus 4.5 <noreply(a)anthropic.com> - - - - - 661da815 by Teo Camarasu at 2026-03-26T03:50:33-04:00 ghc-internal: Float Generics to near top of module graph We remove GHC.Internal.Generics from the critical path of the `ghc-internal` module graph. GHC.Internal.Generics used to be in the middle of the module graph, but now it is nearer the top (built later). This change thins out the module graph and allows us to get rid of the ByteOrder hs-boot file. We implement this by moving Generics instances from the module where the datatype is defined to the GHC.Internal.Generics module. This trades off increasing the compiled size of GHC.Internal.Generics with reducing the dependency footprint of datatype modules. Not all instances are moved to GHC.Internal.Generics. For instance, `GHC.Internal.Control.Monad.Fix` keeps its instance as it is one of the very last modules compiled in `ghc-internal` and so inverting the relationship here would risk adding GHC.Internal.Generics back onto the critical path. We also don't change modules that are re-exported from the `template-haskell` or `ghc-heap`. This is done to make it easy to eventually move `Generics` to `base` once something like #26657 is implemented. Resolves #26930 Metric Decrease: T21839c - - - - - 45428f88 by sheaf at 2026-03-26T03:51:31-04:00 Avoid infinite loop in deep subsumption This commit ensures we only unify after we recur in the deep subsumption code in the FunTy vs non-FunTy case of GHC.Tc.Utils.Unify.tc_sub_type_deep, to avoid falling into an infinite loop. See the new Wrinkle [Avoiding a loop in tc_sub_type_deep] in Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify. Fixes #26823 Co-authored-by: simonpj <simon.peytonjones(a)gmail.com> - - - - - 2823b039 by Ian Duncan at 2026-03-26T03:52:21-04:00 AArch64: fix MOVK regUsageOfInstr to mark dst as both read and written MOVK (move with keep) modifies only a 16-bit slice of the destination register, so the destination is both read and written. The register allocator must know this to avoid clobbering live values. Update regUsageOfInstr to list the destination in both src and dst sets. No regression test: triggering the misallocation requires specific register pressure around a MOVK sequence, which is difficult to reliably provoke from Haskell source. - - - - - 57b7878d by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #12002 Closes #12002. - - - - - c8f9df2d by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #12046 Closes #12046. Co-authored-by: Andreas Klebinger <klebinger.andreas(a)gmx.at> - - - - - 615d72ac by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #13180 Closes #13180. - - - - - 423eebcf by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #11141 Closes #11141. - - - - - 286849a4 by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #11505 Closes #11505. - - - - - 7db149d9 by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression perf test for #13820 Closes #13820. - - - - - e73c4adb by Simon Jakobi at 2026-03-26T03:53:07-04:00 Add regression test for #10381 Closes #10381. - - - - - 5ebcfb57 by Benjamin Maurer at 2026-03-26T03:54:02-04:00 Generate assembly on x86 for word2float (#22252) We used to emit C function call for MO_UF_Conv primitive. Now emits direct assembly instead. Co-Authored-By: Sylvain Henry <sylvain(a)haskus.fr> Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com> - - - - - 5b550754 by Matthew Pickering at 2026-03-26T03:54:51-04:00 rts: forward clone-stack messages after TSO migration MSG_CLONE_STACK assumed that the target TSO was still owned by the capability that received the message. This is not always true: the TSO can migrate before the inbox entry is handled. When that happened, handleCloneStackMessage could clone a live stack from the wrong capability and use the wrong capability for allocation and performTryPutMVar, leading to stack sanity failures such as checkStackFrame: weird activation record found on stack. Fix this by passing the current capability into handleCloneStackMessage, rechecking msg->tso->cap at handling time, and forwarding the message if the TSO has migrated. Once ownership matches, use the executing capability consistently for cloneStack, rts_apply, and performTryPutMVar. Fixes #27008 - - - - - ef0a1bd2 by mangoiv at 2026-03-26T03:55:34-04:00 release tracking: adopt release tracking ticket from #16816 - - - - - a7f40fd9 by mangoiv at 2026-03-26T03:55:34-04:00 release tracking: add a release tracking ticket Brings the information in the release tracking ticket up to date with https://gitlab.haskell.org/ghc/ghc-hq/-/blob/main/release-management.mkd Resolves #26691 - - - - - 161d3285 by Teo Camarasu at 2026-03-26T03:56:18-04:00 Revert "Set default eventlog-flush-interval to 5s" Flushing the eventlog forces a synchronisation of all the capabilities and there was a worry that this might lead to a performance cost for some highly parallel workloads. This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2. - - - - - 36eed985 by Cheng Shao at 2026-03-26T03:57:03-04:00 ghc-boot: move GHC.Data.SmallArray to ghc-boot This commit moves `GHC.Data.SmallArray` from the `ghc` library to `ghc-boot`, so that it can be used by `ghci` as well: - The `Binary` (from `ghc`) instance of `SmallArray` is moved to `GHC.Utils.Binary` - Util functions `replicateSmallArrayIO`, `mapSmallArrayIO`, `mapSmallArrayM_`, `imapSmallArrayM_` , `smallArrayFromList` and `smallArrayToList` are added - The `Show` instance is added - The `Binary` (from `binary`) instance is added - - - - - fdf828ae by Cheng Shao at 2026-03-26T03:57:03-04:00 compiler: use `Binary` instance of `BCOByteArray` for bytecode objects This commit defines `Binary` (from `compiler`) instance of `BCOByteArray` which serializes the underlying buffer directly, and uses it directly in bytecode object serialization. Previously we reuse the `Binary` (from `binary`) instance, and this change allows us to avoid double-copying via an intermediate `ByteString` when using `put`/`get` in `binnary`. Also see added comment for explanation. - - - - - 3bf62d0a by Cheng Shao at 2026-03-26T03:57:03-04:00 ghci: use SmallArray directly in ResolvedBCO This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when applicable, making the memory representation more compact and reducing marshaling overhead. Closes #27058. - - - - - 3d6492ce by Wen Kokke at 2026-03-26T03:57:53-04:00 Fix race condition between flushEventLog and start/endEventLogging. This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving: - `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`. - `flushEventLog` flushes some events to `event_log_writer`. - `startEventLogging` writes the eventlog header to `event_log_writer`. This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header. This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as: ```c void flushEventLog(Capability **cap USED_IF_THREADS) { ACQUIRE_LOCK(&state_change_mutex); flushEventLog_(cap); RELEASE_LOCK(&state_change_mutex); } ``` The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable. I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours. - - - - - 7b9a75f0 by Phil Hazelden at 2026-03-26T03:58:37-04:00 Fix build with werror on glibc 2.43. We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same values as defined in glibc prior to 2.43. But in 2.43, glibc changes them to new values, which means we get a warning when redefining them. By `#undef`ing them first, we no longer get a warning. Closes #27076. - - - - - fe6e76c5 by Tobias Haslop at 2026-03-26T03:59:30-04:00 Fix broken Haddock link to Bifunctor class in description of Functor class - - - - - 404b71c1 by Luite Stegeman at 2026-03-27T04:40:49-04:00 Fix assert in Interpreter.c If we skip exactly the number of words on the stack we end up on the first word in the next chunk. - - - - - a85bd503 by Luite Stegeman at 2026-03-27T04:40:49-04:00 Support arbitrary size unboxed tuples in bytecode This stores the size (number of words on the stack) of the next expected tuple in the TSO, ctoi_spill_size field, eliminating the need of stg_ctoi_tN frames for each size. Note: On 32 bit platform there is still a bytecode tuple size limit of 255 words on the stack. Fixes #26946 - - - - - e2209031 by Luite Stegeman at 2026-03-27T04:40:49-04:00 Add specialized frames for small tuples Small tuples are now returned more efficiently to the interpreter. They use one less word of stack space and don't need manipulation of the TSO anymore. - - - - - b26bb2ea by VeryMilkyJoe at 2026-03-27T04:41:38-04:00 Remove backwards compatibility pattern synonym `ModLocation` Fixes #24932 - - - - - 66e5e324 by Vladislav Zavialov at 2026-03-27T04:42:25-04:00 Extend HsExpr with the StarIsType syntax (#26587, #26967) This patch allows kinds of the form `k -> *` and `* -> k` to occur in expression syntax, i.e. to be used as required type arguments. For example: {-# LANGUAGE RequiredTypeArguments, StarIsType #-} x1 = f (* -> * -> *) x2 = f (forall k. k -> *) x3 = f ((* -> *) -> Constraint) Summary of the changes: * Introduce the HsStar constructor of HsExpr and its extension field XStar. It is analogous to HsStarTy in HsType. * Refactor HsStarTy to store the unicode flag as TokStar, defined as type TokStar = EpUniToken "*" "★" -- similar to TokForall, TokRArrow, etc. The token is stored in the extension field and replaces the Bool field. * Extend the `infixexp2` nonterminal to parse `*` as a direct argument of `->`. This is more limited than the full StarIsType syntax, but has the nice property of not conflicting with the multiplication operator `a * b`. Test case: T26967 T26967_tyop - - - - - f8de456f by Sylvain Henry at 2026-03-27T04:43:22-04:00 STM: don't create a transaction in the rhs of catchRetry# (#26028) We don't need to create a transaction for the rhs of (catchRetry#) because contrary to the lhs we don't need to abort it on retry. Moreover it is particularly harmful if we have code such as (#26028): let cN = readTVar vN >> retry tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...)) atomically tree Because it will stack transactions for the rhss and the read-sets of all the transactions will be iteratively merged in O(n^2) after the execution of the most nested retry. This is the second attempt at implementing this. The first attempt triggered segfaults (#26291) and has been reverted. Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com> - - - - - fcf092dd by Luite Stegeman at 2026-03-27T04:44:17-04:00 Windows: remove StgAsyncIOResult and fix crash/leaks In stg_block_async{_void}, a stack slot was reserved for an StgAsyncIOResult. This slot would be filled by the IO manager upon completion of the async call. However, if the blocked thread was interrupted by an async exception, we would end up in an invalid state: - If the blocked computation was never re-entered, the StgAsyncIOResult would never be freed. - If the blocked computation was re-entered, the thread would find an unitialized stack slot for the StgAsyncIOResult, leading to a crash reading its fields, or freeing the pointer. We fix this by removing the StgAsyncIOResult altogether and writing the result directly to the stack. Fixes #26341 - - - - - 05094993 by Luite Stegeman at 2026-03-27T04:45:12-04:00 Don't refine DEFAULT alt for unary typeclasses A non-DEFAULT data alt for a unary typeclass dictionary would interfere with Unary Class Magic, leading to segfaults. fixes #27071 - - - - - 4ee260cf by sheaf at 2026-03-27T04:46:06-04:00 Fix several oversights in hsExprType This commit fixes several oversights in GHC.Hs.Syn.Type.hsExprType: - The 'RecordCon' case was returning the type of the constructor, instead of the constructor application. This is fixed by using 'splitFunTys'. - The 'ExplicitTuple' case failed to take into account tuple sections, and was also incorrectly handling 1-tuples (e.g. 'Solo') which can be constructed using Template Haskell. - The 'NegApp' case was returning the type of the negation operator, again failing to apply it to the argument. Fixed by using 'funResultTy'. - The 'HsProc' case was computing the result type of the arrow proc block, without taking into account the argument type. Fix that by adding a new field to 'CmdTopTc' that stores the arrow type, so that we can construct the correct result type `arr a b` for `proc (pat :: a) -> (cmd :: b)`. - The 'ArithSeq' and 'NegApp' cases were failing to take into account the result 'HsWrapper', which could e.g. silently drop casts. This is fixed by introducing 'syntaxExpr_wrappedFunResTy' which, on top of taking the result type, applies the result 'HsWrapper'. These fixes are validated by the new GHC API test T26910. Fixes #26910 - - - - - e97232ce by Hai at 2026-03-27T04:47:04-04:00 Parser.y: avoid looking at token with QualifiedDo This changes the behavior of 'hintQualifiedDo' so that the supplied token is not inspected when the QualifiedDo language extension bit is set. - - - - - 9831385b by Vladislav Zavialov at 2026-03-27T17:22:30-04:00 Infix holes in types (#11107) This patch introduces several improvements that follow naturally from refactoring HsOpTy to represent the operator as an HsType, aligning it with the approach taken by OpApp and HsExpr. User-facing changes: 1. Infix holes (t1 `_` t2) are now permitted in types, following the precedent set by term-level expressions. Test case: T11107 2. Error messages for illegal promotion ticks are now reported at more precise source locations. Test case: T17865 Internal changes: * The definition of HsOpTy now mirrors that of OpApp: | HsOpTy (XOpTy p) (LHsType p) (LHsType p) (LHsType p) | OpApp (XOpApp p) (LHsExpr p) (LHsExpr p) (LHsExpr p) This moves us one step closer to unifying HsType and HsExpr. * Ignoring locations, the old pattern match (HsOpTy x prom lhs op rhs) is now written as (HsOpTy x lhs (HsTyVar x' prom op) rhs) but we also handle (HsOpTy x lhs (HsWildCardTy x') rhs) Constructors other than HsTyVar and HsWildCardTy never appear in the operator position. * The various definitions across the compiler have been updated to work with the new representation, drawing inspiration from the term-level pipeline where appropriate. For example, ppr_infix_ty <=> ppr_infix_expr get_tyop <=> get_op lookupTypeFixityRn <=> lookupExprFixityRn (the latter is factored out from rnExpr) Test cases: T11107 T17865 - - - - - 5b6757d7 by mangoiv at 2026-03-27T17:23:19-04:00 ci: build i386 non-validate for deb12 This is a small fix that will unlock ghcup metadata to run, i386 debian 12 was missing as a job. - - - - - cf942119 by Cheng Shao at 2026-03-30T15:24:37-04:00 ghc-boot: remove unused SizedSeq instances and functions This commit removes unused `SizedSeq` instances and functions, only keeping the bits we need for hpc tick sequence for now. - - - - - 22c5b7cc by Cheng Shao at 2026-03-30T15:24:38-04:00 ghci: remove unused GHCi.BinaryArray This patch removes the unused `GHCi.BinaryArray` module from `ghci`. Closes #27108. - - - - - 77abb4ab by Cheng Shao at 2026-03-30T15:25:21-04:00 testsuite: mark T17912 as fragile on Windows T17912 is still fragile on Windows, it sometimes unexpectedly pass in CI. This especially strains our already scarce Windows CI runner resources. Mark it as fragile on Windows for the time being. - - - - - d741a6cc by Andreas Klebinger at 2026-03-31T04:39:33-04:00 Bump minimum shake version for hadrian. We also add the shake version we want to stack.yaml Fixes #26884 - - - - - 5e556f9e by Vladislav Zavialov at 2026-03-31T04:40:16-04:00 Status check for the HsType~HsExpr refactoring (#25121) Add a test case to track the status of a refactoring project within GHC whose goal is to arrive at the following declaration: type HsType = HsExpr The rationale for this is to increase code reuse between the term- and type-level code in the compiler front-end (AST, parser, renamer, type checker). The status report is saved to testsuite/tests/ghc-api/T25121_status.stdout and provides useful insights into what needs to happen to make progress on the ticket. - - - - - acffb1b1 by fendor at 2026-03-31T04:41:02-04:00 Extract Binary instances to `GHC.ByteCode.Binary` - - - - - e2ea8e25 by fendor at 2026-03-31T04:41:02-04:00 Add `seqNonEmpty` for evaluating `NonEmpty a` - - - - - 048b00b7 by fendor at 2026-03-31T04:41:02-04:00 Record `LinkableUsage` instead of `Linkable` in `LoaderState` Retaining a ByteCode `Linkable` after it has been loaded retains its `UnlinkedBCO`, keeping it alive for the remainder of the program. This starts accumulating a lot of `UnlinkedBCO` and memory over time. However, the `Linkable` is merely used to later record its usage in `mkObjectUsage`, which is used for recompilation checking. However, this is incorrect, as the interface file and bytecode objects could be in different states, e.g. the interface changes, but the bytecode library hasn't changed so we don't need to recompile and vice versa. By computing a `Fingerprint` for the `ModuleByteCode`, and recording it in the `LinkableUsage`, we know precisely whether the `ByteCode` object on disk is outdated. Thus, parts of this commit just makes sure that we efficiently compute a `Fingerprint` for `ModuleByteCode` and store it in the on-disk representation of `ModuleByteCode`. We change the `LoaderState` to retain `LinkableUsage`, which is smaller representation of a `Linkable`. This allows us to free the unneeded fields of `Linkable` after linking them. We declare the following memory invariants that this commit implements: * No `LinkablePart` should be retained from `LoaderState`. * `Linkable`s should be unloaded after they have been loaded. These invariants are unfortunately tricky to automatically uphold, so we are simply documenting our assumptions for now. We introduce the `linkable-space` test which makes sure that after loading, no `DotGBC` or `UnlinkedBCO` is retained. ------------------------- Metric Increase: MultiLayerModulesTH_OneShot ------------------------- We allocate a bit more, but the peak number of bytes doesn't change. While a bit unfortunate, accepting the metric increase. We add multiple new performance measurements where we were able to observe the desired memory invariants. Further, we add regression tests to validate that the recompilation checker behaves more correct than before. - - - - - 2d1c1997 by Simon Jakobi at 2026-03-31T04:41:46-04:00 Eliminate dictionary-passing in ListMap operations Mark the ListMap helpers 'INLINABLE' so importing modules can specialise the 'TrieMap (ListMap m)' methods and avoid recursive dictionary-passing. See Note [Making ListMap operations specialisable]. Fixes #27097 - - - - - ed2c6570 by Cheng Shao at 2026-03-31T04:42:33-04:00 testsuite: fix testdir cleanup logic on Windows testdir cleanup is unreliable on Windows (#13162) and despite existing hacks in the driver, new failure mode has occurred. This patch makes it print the warning and carry on when failed to clean up a testdir, instead of reporting a spurious framework failure. See added comment for detailed explanation. - - - - - d9388e29 by Simon Jakobi at 2026-03-31T13:14:59-04:00 Add regression test for #18177 Closes #18177. Assisted-by: Codex - - - - - 6a10045c by mangoiv at 2026-03-31T13:15:43-04:00 ci: allow metric decrease for two tests on i386 There has been a nightly failure on i386 due to a compiler runtime improvement on i386 debian 12. We allow that. Metric Decrease (test_env='i386-linux-deb12'): T12707 T8095 - - - - - 7fbb4fcb by Rodrigo Mesquita at 2026-04-01T12:16:33+00:00 Bump default language edition to GHC2024 As per the accepted ghc-proposal#632 Fixes #26039 - - - - - 5ae43275 by Peng Fan at 2026-04-01T19:01:06-04:00 NCG/LA64: add cmpxchg and xchg primops And append some new instructions for LA664 uarch. Apply fix to cmpxchg-prim by Andreas Klebinger. Suggestions in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15515 - - - - - 8f95534a by Duncan Coutts at 2026-04-01T19:01:52-04:00 Remove signal-based ticker implementations Fixes issue #27073 All supported platforms should work with the pthreads + nanosleep based ticker implementation. This avoids all the problems with using signals. In practice, all supported platforms were probably using the non-signal tickers already, which is probably why we do not get lots of reports about deadlocks and other weirdness: we were definately using functions that are not async signal safe in the tick handler (such as fflush to flussh the eventlog). Only Solaris was explicitly using the timer_create ticker impl, and even Solaris could probably use the pthreads one (if anyone cared: Solaris is no longer a Teir 3 supported platform). Plausibly the only supported platform that this will change will be AIX, which should now use the pthreads impl. - - - - - 51b32b0d by Duncan Coutts at 2026-04-01T19:01:52-04:00 Tidy up some timer/ticker comments elsewhere - - - - - 7562bcd7 by Duncan Coutts at 2026-04-01T19:01:52-04:00 Remove now-unused install_vtalrm_handler Support function used by both of the signal-based ticker implementations. - - - - - 6da127c7 by Duncan Coutts at 2026-04-01T19:01:52-04:00 No longer probe for timer_create in rts/configure It was only used by the TimerCreate.c ticker impl. - - - - - 3fd490fa by Duncan Coutts at 2026-04-01T19:01:53-04:00 Note that rtsTimerSignal is deprecated. - - - - - 63099b0f by Simon Jakobi at 2026-04-01T19:02:39-04:00 Add perf test for #13960 Closes #13960. - - - - - 58009c14 by Apoorv Ingle at 2026-04-02T09:51:24+01:00 Streamline expansions using HsExpansion (#25001) Notes added [Error Context Stack] [Typechecking by expansion: overview] Notes updated Note [Expanding HsDo with XXExprGhcRn] [tcApp: typechecking applications] ------------------------- Metric Decrease: T9020 ------------------------- There are 2 key changes: 1. `HsExpand` datatype mediates between expansions 2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv` This has some consequences detailed below: 1. `HsExpand` datatype mediates between expansions * Simplifies the implementations of `tcExpr` to work on `XExpr` * Removes `VACtxt` (and its associated `VAExpansion` and `VACall`) datatype, it is subsumed by simply a `SrcSpan`. * Removes the function `addHeadCtxt` as it is now mearly setting a location * The function `tcValArgs` does its own argument number management * move `splitHsTypes` out of `tcApp` * Removes special case of tcBody from `tcLambdaMatches` * Removes special case of `dsExpr` for `ExpandedThingTc` * Renames `tcMonoExpr` -> `tcMonoLExpr`, `tcMonoExprNC` -> `tcMonoLExpr` * Renames `EValArg`, `EValArgQL` fields: `ea_ctxt` -> `ea_loc_span` and `eaql_ctx` -> `eaql_loc_span` * Remove `PopErrCtxt` from `XXExprGhcRn` * `fun_orig` in tcInstFun depends on the SrcSpan of the head of the application chain (similar to addArgCtxt) - it references the application chain head if it is user located, or uses the error context stack as a fallback if it's a generated location * Make a new variant `GeneratedSrcSpan` in `SrcSpan` for HIEAst Nodes - Expressions wrapped around `GeneratedSrcSpan` are ignored and never added to the error context stack - In Explicit list expansion `fromListN` is wrapped with a `GeneratedSrcSpan` with `GeneratedSrcSpanDetails` field to store the original srcspan 2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv` * Merge `HsThingRn` to `HsCtxt` * Landmark Error messages are now just computed on the fly * Make HsExpandedRn and HsExpandedTc payload a located HsExpr GhcRn * `HsCtxt` are tidied and zonked at the end right before printing Co-authored-by: simonpj <simon.peytonjones(a)gmail.com> - - - - - bc4b4487 by Zubin Duggal at 2026-04-03T14:22:27-04:00 driver: recognise .dyn_o as a valid object file to link if passed on the command line. This allows plugins compiled with this suffix to run. Fixes #24486 - - - - - 5ebb9121 by Simon Jakobi at 2026-04-03T14:23:11-04:00 Add regression test for #16145 Closes #16145. - - - - - c1fc1c44 by Simon Peyton Jones at 2026-04-03T19:56:07-04:00 Refactor eta-expansion in Prep The Prep pass does eta-expansion but I found cases where it was doing bad things. So I refactored and simplified it quite a bit. In the new design * There is no distinction between `rhs` and `body`; in particular, lambdas can now appear anywhere, rather than just as the RHS of a let-binding. * This change led to a significant simplification of Prep, and a more straightforward explanation of eta-expansion. See the new Note [Eta expansion] * The consequences is that CoreToStg needs to handle naked lambdas. This is very easy; but it does need a unique supply, which forces some simple refactoring. Having a unique supply to hand is probably a good thing anyway. - - - - - 21beda2c by Simon Peyton Jones at 2026-04-03T19:56:07-04:00 Clarify Note [Interesting dictionary arguments] Ticket #26831 ended up concluding that the code for GHC.Core.Opt.Specialise.interestingDict was good, but the commments were a bit inadequate. This commit improves the comments slightly. - - - - - 3eaac1f2 by Simon Peyton Jones at 2026-04-03T19:56:07-04:00 Make inlining a bit more eager for overloaded functions If we have f d = ... (class-op d x y) ... we should be eager to inline `f`, because that may change the higher order call (class-op d x y) into a call to a statically known function. See the discussion on #26831. Even though this does a bit /more/ inlining, compile times decrease by an average of 0.4%. Compile time changes: DsIncompleteRecSel3(normal) 431,786,104 -2.2% ManyAlternatives(normal) 670,883,768 -1.6% ManyConstructors(normal) 3,758,493,832 -2.6% GOOD MultilineStringsPerf(normal) 29,900,576 -2.8% T14052Type(ghci) 1,047,600,848 -1.2% T17836(normal) 392,852,328 -5.2% T18478(normal) 442,785,768 -1.4% T21839c(normal) 341,536,992 -14.1% GOOD T3064(normal) 174,086,152 +5.3% BAD T5631(normal) 506,867,800 +1.0% hard_hole_fits(normal) 209,530,736 -1.3% info_table_map_perf(normal) 19,523,093,184 -1.2% parsing001(normal) 377,810,528 -1.1% pmcOrPats(normal) 60,075,264 -0.5% geo. mean -0.4% minimum -14.1% maximum +5.3% Runtime changes haddock.Cabal(normal) 27,351,988,792 -0.7% haddock.base(normal) 26,997,212,560 -0.6% haddock.compiler(normal) 219,531,332,960 -1.0% Metric Decrease: LinkableUsage01 ManyConstructors T17949 T21839c T13035 TcPlugin_RewritePerf hard_hole_fits Metric Increase: T3064 - - - - - 5cbc2c82 by Matthew Pickering at 2026-04-03T19:57:02-04:00 bytecode: Add magic header/version to bytecode files In order to avoid confusing errors when using stale interface files (ie from an older compiler version), we add a simple header/version check like the one for interface files. Fixes #27068 - - - - - d95a1936 by fendor at 2026-04-03T19:57:02-04:00 Add constants for bytecode in-memory buffer size Introduce a common constant for the default size of the .gbc and .bytecodelib binary buffer. The buffer is by default set to 1 MB. - - - - - b822c30a by mangoiv at 2026-04-03T19:57:49-04:00 testsuite: filter stderr for static001 on darwin This reactivates the test on x86_64 darwin as this should have been done long ago and ignores warnings emitted by ranlib on newer version of the darwin toolchain since they are benign. (no symbols for stub libraries) Fixes #27116 - - - - - 28ce1f8a by Andreas Klebinger at 2026-04-03T19:58:44-04:00 Give the Data instance for ModuleName a non-bottom toConstr implementation. I've also taken the liberty to add Note [Data.Data instances for GHC AST Types] describing some of the uses of Data.Data I could find. Fixes #27129 - - - - - 8ca41ffe by mangoiv at 2026-04-03T19:59:30-04:00 issue template: fix add bug label - - - - - 3981db0c by Sylvain Henry at 2026-04-03T20:00:33-04:00 Add more canned GC functions for common register patterns (#27142) Based on analysis of heap-check sites across the GHC compiler and Cabal, the following patterns were not covered by existing canned GC functions but occurred frequently enough to warrant specialisation: stg_gc_ppppp -- 5 GC pointers stg_gc_ip -- unboxed word + GC pointer stg_gc_pi -- GC pointer + unboxed word stg_gc_ii -- two unboxed words stg_gc_bpp -- byte (I8) + two GC pointers Adding these reduces the fraction of heap-check sites falling back to the generic GC path from ~1.4% to ~0.4% when compiling GHC itself. Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com> - - - - - d17d1435 by Matthew Pickering at 2026-04-03T20:01:19-04:00 Make home unit dependencies stored as sets Co-authored-by: Wolfgang Jeltsch <wolfgang(a)well-typed.com> - - - - - 92a97015 by Simon Peyton Jones at 2026-04-05T00:58:57+01:00 Add Invariant (NoTypeShadowing) to Core This commit addresses #26868, by adding a new invariant (NoTypeShadowing) to Core. See Note [No type-shadowing in Core] in GHC.Core - - - - - 8b5a5020 by Simon Peyton Jones at 2026-04-05T00:58:57+01:00 Major refactor of free-variable functions For some time we have had two free-variable mechanims for types: * The "FV" mechanism, embodied in GHC.Utils.FV, which worked OK, but was fragile where eta-expansion was concerned. * The TyCoFolder mechanism, using a one-shot EndoOS accumulator I finally got tired of this and refactored the whole thing, thereby addressing #27080. Now we have * `GHC.Types.Var.FV`, which has a composable free-variable result type, very much in the spirit of the old `FV`, but much more robust. (It uses the "one shot trick".) * GHC.Core.TyCo.FVs now has just one technology for free variables. All this led to a lot of renaming. There are couple of error-message changes. The change in T18451 makes an already-poor error message even more mysterious. But it really needs a separate look. We also now traverse the AST in a different order leading to a different but still deterministic order for FVs and test output has been adjusted accordingly. - - - - - 4bf040c6 by sheaf at 2026-04-05T14:56:29-04:00 Add utility pprTrace_ function This function is useful for quick debugging, as it can be added to a where clause to pretty-print debugging information: fooBar x y | cond = body1 | otherwise = body2 where !_ = pprTrace_ "fooBar" $ vcat [ text "x:" <+> ppr x , text "y:" <+> ppr y , text "cond:" <+> ppr cond ] - - - - - 502e6ffe by Andrew Lelechenko at 2026-04-07T04:47:21-04:00 base: improve error message for Data.Char.chr As per https://github.com/haskell/core-libraries-committee/issues/384 - - - - - b21bd52e by Simon Peyton Jones at 2026-04-07T04:48:07-04:00 Refactor FunResCtxt a bit Fixes #27154 - - - - - 7fe84ea5 by Zubin Duggal at 2026-04-07T19:11:52+05:30 compiler: Warn when -finfo-table-map is used with -fllvm These are currently not supported together. Fixes #26435 - - - - - 4a45a7da by Matthew Pickering at 2026-04-08T04:37:29-04:00 packaging: correctly propagate build/host/target to bindist configure script At the moment the host and target which we will produce a compiler for is fixed at the initial configure time. Therefore we need to persist the choice made at this time into the installation bindist as well so we look for the right tools, with the right prefixes at install time. In the future, we want to provide a bit more control about what kind of bindist we produce so the logic about what the host/target will have to be written by hadrian rather than persisted by the configure script. In particular with cross compilers we want to either build a normal stage 2 cross bindist or a stage 3 bindist, which creates a bindist which has a native compiler for the target platform. Fixes #21970 Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com> - - - - - b0950df6 by Sven Tennie at 2026-04-08T04:37:29-04:00 Cross --host and --target no longer required for cross (#21970) We set sane defaults in the configure script. Thus, these paramenters aren't required any longer. - - - - - fef35216 by Sven Tennie at 2026-04-08T04:37:30-04:00 ci: Define USER_CONF_CC_OPTS_STAGE2 for aarch64/mingw ghc-toolchain doesn't see $CONF_CC_OPTS_STAGE2 when the bindist gets configured. So, the hack to override the compiler gets lost. - - - - - 8dd6f453 by Cheng Shao at 2026-04-08T04:38:11-04:00 ghci: use ShortByteString for LookupSymbol/LookupSymbolInDLL/LookupClosure messages This patch refactors ghci to use `ShortByteString` for `LookupSymbol`/`LookupSymbolInDLL`/`LookupClosure` messages as the first part of #27147. Co-authored-by: Codex <codex(a)openai.com> - - - - - 371ef200 by Cheng Shao at 2026-04-08T04:38:11-04:00 ghci: use ShortByteString for MkCostCentres message This patch refactors ghci to use `ShortByteString` for `MkCostCentres` messages as a first part of #27147. This also considerably lowers the memory overhead of breakpoints when cost center profiling is enabled. ------------------------- Metric Decrease: interpreter_steplocal ------------------------- Co-authored-by: Codex <codex(a)openai.com> - - - - - 4a122bb6 by Phil Hazelden at 2026-04-08T20:49:42-04:00 Implement modifiers syntax. The `%m` syntax of linear types is now accepted in more places, to allow use by future extensions, though so far linear types is still the only consumer. This may break existing code where it * Uses -XLinearTypes. * Has code of the form `a %m -> b`, where `m` can't be inferred to be kind Multiplicity. The code can be fixed either by adding a kind annotation, or by setting `-XLinearTypes -XNoModifiers`. Proposal: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0370-m… - - - - - 07267f79 by Zubin Duggal at 2026-04-08T20:50:25-04:00 hadrian: Don't include the package hash in the haddock directory Since GHC 9.8 and hash_unit_ids, haddock urls have looked like`ghc-9.10.3/doc/html/libraries/base-4.20.2.0-39f9/**/*.html` The inclusion of the hash makes it hard for downstream non-boot packages to properly link to these files, as the hash is not part of a standard cabal substitution. Since we only build one version of each package, we don't need the hash to disambiguate anything, we can just remove it. Fixes #26635 - - - - - 0a83b95b by ARATA Mizuki at 2026-04-08T20:51:18-04:00 testsuite: Allow multiple ways to be run by setting multiple command-line options This patch allows multiple `--test-way`s to take effect, like: $ hadrian/build test --test-way=normal --test-way=llvm Previously, only one way was run if the test speed was 'normal' or 'fast'. Closes #26926 Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> - - - - - e841931c by Teo Camarasu at 2026-04-08T20:52:00-04:00 doc: improve eventlog-flush-interval flag documentation We mention the performance cost and how this flag can be turned off. Resolves #27056 - - - - - e332db25 by Teo Camarasu at 2026-04-08T20:52:01-04:00 docs/user_guide: fix typo - - - - - 5b82080a by Simon Jakobi at 2026-04-08T20:52:44-04:00 Fix -dsuppress-uniques for free variables in demand signatures Before: Str=b{sXyZ->S} With this patch: Str=b{S} T13143.stderr is updated accordingly. Fixes #27106. - - - - - b7a084cc by Simon Jakobi at 2026-04-08T20:53:27-04:00 Documentation fixes for demand signature notation Fixes #27115. - - - - - 59391132 by Simon Jakobi at 2026-04-08T20:54:08-04:00 Use upsert for non-deleting map updates Some compiler functions were using `alter`, despite never removing any entries: they only update an existing entry or insert a new one. These functions are converted to using `upsert`: alter :: (Maybe a -> Maybe a) -> Key -> Map a -> Map a upsert :: (Maybe a -> a) -> Key -> Map a -> Map a `upsert` variants are also added to APIs of the various Word64Map wrapper types. The precedent for this `upsert` operation is in the containers library: see https://github.com/haskell/containers/pull/1145 Metrics: compile_time/bytes allocated ------------------------------------- geo. mean: -0.1% minimum: -0.5% maximum: +0.0% Resolves #27140. - - - - - da7e82f4 by Cheng Shao at 2026-04-08T20:54:49-04:00 testsuite: fix testsuite run for +ipe again This patch makes the +ipe flavour transformer pass the entire testsuite again by dropping stdout/stderr checks of certain tests that are sensitive to stack layout changes with `+ipe`. Related: #26799. - - - - - b135a87d by Zubin Duggal at 2026-04-09T19:36:50+05:30 Bump directory submodule to 1.3.11.0 (unreleased) - - - - - 3a291d07 by Zubin Duggal at 2026-04-09T19:36:50+05:30 Bump file-io submodule to 0.2.0 - - - - - e0ab606d by Zubin Duggal at 2026-04-10T18:40:20+05:30 Release notes for GHC 10.0 - - - - - e08b9b34 by Zubin Duggal at 2026-04-10T18:40:20+05:30 Bump ghc-prim version to 0.14.0 - - - - - a92aac6e by Zubin Duggal at 2026-04-10T18:40:20+05:30 Bump template-haskell to 2.25.0.0; update submodule exceptions for TH 2.25 - - - - - f254d9e8 by Zubin Duggal at 2026-04-10T18:40:20+05:30 Bump GHC version to 10.0 - - - - - 6ce0368a by Zubin Duggal at 2026-04-10T18:40:28+05:30 Bump base to 4.23.0.0; update submodules for base 4.24 upper bound - - - - - 702fb8a5 by Zubin Duggal at 2026-04-10T18:40:28+05:30 Bump GHC version to 10.1; update submodules template-haskell-lift and template-haskell-quasiquoter for ghc-internal 10.200 - - - - - 75df1ca4 by Zubin Duggal at 2026-04-10T18:40:28+05:30 Use changelog.d for release notes (#26002) GHC now uses a fragment-based changelog workflow using a custom script adapted from https://codeberg.org/fgaz/changelog-d. Contributors add a file in changelog.d/ for each user-facing change. At release time, these are assembled into release notes for sphinx (in RST) format, using the tool. New hadrian `changelog` target to generate changelogs CI job to validate changelog entries for MRs unless skipped with ~"no-changelog" label Teach sphinx about ghc-mr: extlink to link to MRs Remove `ghc-package-list` from sphinx, and implement it in changelog-d instead (Fixes #26476). (cherry picked from commit 989c07249978f418dfde1353abfad453f024d61a) - - - - - 585d7450 by Luite Stegeman at 2026-04-11T02:17:13-04:00 tc: discard warnings in tcUserStmt Plan C We typecheck let_stmt twice, but we don't want the warnings twice! see #26233 - - - - - 2df604e9 by Sylvain Henry at 2026-04-11T02:19:30-04:00 Introduce TargetInt to represent target's Int (#15973) GHC was using host 'Int' in several places to represent values that live in the target machine's 'Int' type. This is silently wrong when cross-compiling from a 32-bit host to a 64-bit target: the host Int is 32 bits while the target Int is 64 bits. See Note [TargetInt] in GHC.Platform. Also used the opportunity to make DynTag = Word8. Fixes #15973 Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com> - - - - - 312f1d1f by Sven Tennie at 2026-04-12T18:45:10+02:00 ghc: Distinguish between having an interpreter and having an internal one Actually, these are related but different things: - ghc can run an interpreter (either internal or external) - ghc is compiled with an internal interpreter Splitting the logic solves compiler warnings and expresses the intent better. - - - - - 1216 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/generate-ci/flake.lock - .gitlab/generate-ci/gen_ci.hs - .gitlab/issue_templates/default.md - + .gitlab/issue_templates/release_tracking.md - .gitlab/jobs.yaml - .gitlab/merge_request_templates/Default.md - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - + changelog.d/changelog-entries - + changelog.d/config - compiler/CodeGen.Platform.h - compiler/GHC.hs - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/ByteCode/Asm.hs - + compiler/GHC/ByteCode/Binary.hs - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Linker.hs - + compiler/GHC/ByteCode/Recomp/Binary.hs - compiler/GHC/ByteCode/Serialize.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/Cmm/Dataflow/Graph.hs - compiler/GHC/Cmm/Dataflow/Label.hs - compiler/GHC/Cmm/Expr.hs - compiler/GHC/Cmm/LayoutStack.hs - compiler/GHC/Cmm/Node.hs - compiler/GHC/Cmm/Opt.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/Cmm/Type.hs - compiler/GHC/Cmm/Utils.hs - compiler/GHC/CmmToAsm/AArch64/CodeGen.hs - compiler/GHC/CmmToAsm/AArch64/Instr.hs - compiler/GHC/CmmToAsm/AArch64/Ppr.hs - compiler/GHC/CmmToAsm/AArch64/Regs.hs - compiler/GHC/CmmToAsm/CFG.hs - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/LA64/Instr.hs - compiler/GHC/CmmToAsm/LA64/Ppr.hs - compiler/GHC/CmmToAsm/LA64/Regs.hs - compiler/GHC/CmmToAsm/PPC/CodeGen.hs - compiler/GHC/CmmToAsm/PPC/Ppr.hs - compiler/GHC/CmmToAsm/PPC/Regs.hs - compiler/GHC/CmmToAsm/RV64/CodeGen.hs - compiler/GHC/CmmToAsm/RV64/Ppr.hs - compiler/GHC/CmmToAsm/RV64/Regs.hs - compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs - compiler/GHC/CmmToAsm/Wasm/FromCmm.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/CmmToAsm/X86/Regs.hs - compiler/GHC/CmmToC.hs - compiler/GHC/CmmToLlvm.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/CmmToLlvm/Config.hs - compiler/GHC/CmmToLlvm/Data.hs - compiler/GHC/CmmToLlvm/Mangler.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/DmdAnal.hs - + compiler/GHC/Core/Opt/Range.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/RoughMap.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/Tidy.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/TyCon.hs - compiler/GHC/Core/TyCon/Env.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToStg.hs - compiler/GHC/CoreToStg/AddImplicitBinds.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Data/FastString/Env.hs - compiler/GHC/Data/TrieMap.hs - compiler/GHC/Data/Word64Map/Internal.hs - compiler/GHC/Data/Word64Map/Lazy.hs - compiler/GHC/Data/Word64Map/Strict.hs - compiler/GHC/Data/Word64Map/Strict/Internal.hs - compiler/GHC/Driver/Config/CmmToLlvm.hs - compiler/GHC/Driver/Config/StgToCmm.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Hooks.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Phases.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Plugins.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/DocString.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Expr.hs-boot - compiler/GHC/Hs/Instances.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Syn/Type.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore/Arrows.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Breakpoints.hs - compiler/GHC/HsToCore/Docs.hs - compiler/GHC/HsToCore/Errors/Ppr.hs - compiler/GHC/HsToCore/Errors/Types.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Pmc.hs - compiler/GHC/HsToCore/Pmc/Desugar.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 - 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compiler/Language/Haskell/Syntax/Expr.hs - compiler/Language/Haskell/Syntax/Extension.hs - compiler/Language/Haskell/Syntax/Module/Name.hs - compiler/Language/Haskell/Syntax/Pat.hs - compiler/Language/Haskell/Syntax/Type.hs - compiler/ghc.cabal.in - configure.ac - distrib/configure.ac.in - − docs/users_guide/10.0.1-notes.rst - + docs/users_guide/10.2.1-notes.rst - − docs/users_guide/9.16.1-notes.rst - docs/users_guide/conf.py - docs/users_guide/debug-info.rst - docs/users_guide/exts/control.rst - docs/users_guide/exts/linear_types.rst - + docs/users_guide/exts/modifiers.rst - docs/users_guide/exts/recursive_do.rst - docs/users_guide/exts/required_type_arguments.rst - docs/users_guide/exts/syntax.rst - docs/users_guide/ghc_config.py.in - − docs/users_guide/ghc_packages.py - docs/users_guide/ghci.rst - docs/users_guide/release-notes.rst - docs/users_guide/runtime_control.rst - docs/users_guide/using-optimisation.rst - docs/users_guide/using-warnings.rst - docs/users_guide/utils.py - ghc/GHC/Driver/Session/Mode.hs - ghc/GHCi/Leak.hs - ghc/GHCi/UI.hs - ghc/GHCi/UI/Info.hs - ghc/Main.hs - ghc/ghc-bin.cabal.in - hadrian/bindist/Makefile - hadrian/cabal.project - hadrian/cfg/system.config.in - hadrian/hadrian.cabal - hadrian/src/CommandLine.hs - hadrian/src/Context.hs - hadrian/src/Main.hs - hadrian/src/Oracles/Setting.hs - hadrian/src/Packages.hs - + hadrian/src/Rules/Changelog.hs - hadrian/src/Rules/Documentation.hs - hadrian/src/Rules/Generate.hs - hadrian/src/Rules/Test.hs - hadrian/src/Settings/Builders/Cabal.hs - hadrian/src/Settings/Default.hs - hadrian/src/Settings/Flavours/GhcInGhci.hs - hadrian/src/Settings/Flavours/Validate.hs - hadrian/src/Settings/Packages.hs - hadrian/stack.yaml - libraries/array - libraries/base/base.cabal.in - libraries/base/changelog.md - libraries/base/src/Control/Applicative.hs - libraries/base/src/Data/Char.hs - libraries/base/src/Data/Eq.hs - libraries/base/src/Data/Semigroup.hs - libraries/base/src/GHC/Base.hs - libraries/base/src/GHC/Weak/Finalize.hs - libraries/base/src/Prelude.hs - libraries/base/tests/IO/all.T - libraries/base/tests/enum01.stdout - libraries/base/tests/enum01.stdout-alpha-dec-osf3 - libraries/base/tests/enum01.stdout-ws-64 - libraries/deepseq - libraries/directory - libraries/exceptions - libraries/file-io - libraries/filepath - libraries/ghc-boot-th/ghc-boot-th.cabal.in - libraries/ghc-boot/GHC/Data/SizedSeq.hs - compiler/GHC/Data/SmallArray.hs → libraries/ghc-boot/GHC/Data/SmallArray.hs - libraries/ghc-boot/ghc-boot.cabal.in - libraries/ghc-compact/ghc-compact.cabal - libraries/ghc-experimental/ghc-experimental.cabal.in - libraries/ghc-experimental/src/GHC/Profiling/Eras.hs - + libraries/ghc-experimental/src/GHC/Stack/Decode/Experimental.hs - libraries/ghc-experimental/tests/backtraces/all.T - libraries/ghc-internal/codepages/MakeTable.hs - libraries/ghc-internal/ghc-internal.cabal.in - libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs - libraries/ghc-internal/src/GHC/Internal/Arr.hs - libraries/ghc-internal/src/GHC/Internal/Base.hs - 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testsuite/tests/typecheck/should_run/T3731.hs - + testsuite/tests/vdq-rta/should_compile/T26967.hs - + testsuite/tests/vdq-rta/should_compile/T26967.stderr - + testsuite/tests/vdq-rta/should_compile/T26967_tyop.hs - + testsuite/tests/vdq-rta/should_compile/T26967_tyop.stderr - testsuite/tests/vdq-rta/should_compile/all.T - testsuite/tests/vdq-rta/should_fail/T24159_type_syntax_th_fail.script - testsuite/tests/warnings/should_fail/CaretDiagnostics1.hs - testsuite/tests/warnings/should_fail/CaretDiagnostics1.stderr - testsuite/tests/warnings/should_fail/T24396c.hs - testsuite/tests/warnings/should_fail/T24396c.stderr - testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs - + utils/changelog-d/ChangelogD.hs - + utils/changelog-d/LICENSE - + utils/changelog-d/README.md - + utils/changelog-d/changelog-d.cabal - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Parsers.hs - utils/check-exact/Transform.hs - utils/check-exact/Utils.hs - utils/deriveConstants/Main.hs - utils/haddock/haddock-api/haddock-api.cabal - utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs - utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs - utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs - utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs - utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Utils.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface/Create.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs - utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - utils/haddock/haddock-library/haddock-library.cabal - utils/haddock/haddock-test/haddock-test.cabal - utils/haddock/haddock.cabal - utils/haddock/html-test/src/LinearTypes.hs - utils/haddock/latex-test/src/LinearTypes/LinearTypes.hs - utils/hsc2hs - 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/a7c80fe393d7ef5cb034aa6fa6c98e… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/a7c80fe393d7ef5cb034aa6fa6c98e… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/supersven/libDir-setting] 12 commits: Bump directory submodule to 1.3.11.0 (unreleased)
by Sven Tennie (＠supersven) 12 Apr '26

12 Apr '26

Sven Tennie pushed to branch wip/supersven/libDir-setting at Glasgow Haskell Compiler / GHC Commits: b135a87d by Zubin Duggal at 2026-04-09T19:36:50+05:30 Bump directory submodule to 1.3.11.0 (unreleased) - - - - - 3a291d07 by Zubin Duggal at 2026-04-09T19:36:50+05:30 Bump file-io submodule to 0.2.0 - - - - - e0ab606d by Zubin Duggal at 2026-04-10T18:40:20+05:30 Release notes for GHC 10.0 - - - - - e08b9b34 by Zubin Duggal at 2026-04-10T18:40:20+05:30 Bump ghc-prim version to 0.14.0 - - - - - a92aac6e by Zubin Duggal at 2026-04-10T18:40:20+05:30 Bump template-haskell to 2.25.0.0; update submodule exceptions for TH 2.25 - - - - - f254d9e8 by Zubin Duggal at 2026-04-10T18:40:20+05:30 Bump GHC version to 10.0 - - - - - 6ce0368a by Zubin Duggal at 2026-04-10T18:40:28+05:30 Bump base to 4.23.0.0; update submodules for base 4.24 upper bound - - - - - 702fb8a5 by Zubin Duggal at 2026-04-10T18:40:28+05:30 Bump GHC version to 10.1; update submodules template-haskell-lift and template-haskell-quasiquoter for ghc-internal 10.200 - - - - - 75df1ca4 by Zubin Duggal at 2026-04-10T18:40:28+05:30 Use changelog.d for release notes (#26002) GHC now uses a fragment-based changelog workflow using a custom script adapted from https://codeberg.org/fgaz/changelog-d. Contributors add a file in changelog.d/ for each user-facing change. At release time, these are assembled into release notes for sphinx (in RST) format, using the tool. New hadrian `changelog` target to generate changelogs CI job to validate changelog entries for MRs unless skipped with ~"no-changelog" label Teach sphinx about ghc-mr: extlink to link to MRs Remove `ghc-package-list` from sphinx, and implement it in changelog-d instead (Fixes #26476). (cherry picked from commit 989c07249978f418dfde1353abfad453f024d61a) - - - - - 585d7450 by Luite Stegeman at 2026-04-11T02:17:13-04:00 tc: discard warnings in tcUserStmt Plan C We typecheck let_stmt twice, but we don't want the warnings twice! see #26233 - - - - - 2df604e9 by Sylvain Henry at 2026-04-11T02:19:30-04:00 Introduce TargetInt to represent target's Int (#15973) GHC was using host 'Int' in several places to represent values that live in the target machine's 'Int' type. This is silently wrong when cross-compiling from a 32-bit host to a 64-bit target: the host Int is 32 bits while the target Int is 64 bits. See Note [TargetInt] in GHC.Platform. Also used the opportunity to make DynTag = Word8. Fixes #15973 Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com> - - - - - 37a80336 by Sven Tennie at 2026-04-12T12:51:30+02:00 Add config setting for LibDir (#19174) Previously, the libDir was derived from topDir. This won't work for inplace stage2 cross-compilers where binaries and libraries are in different stage dirs (`_build/stage1/` for executables and `_build/stage2` for libraries). - - - - - 96 changed files: - .gitlab-ci.yml - .gitlab/issue_templates/release_tracking.md - .gitlab/merge_request_templates/Default.md - + changelog.d/changelog-entries - + changelog.d/config - + changelog.d/libdir-setting - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/Cmm/LayoutStack.hs - compiler/GHC/Cmm/Utils.hs - compiler/GHC/Driver/Config/Interpreter.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Platform.hs - compiler/GHC/Platform/Tag.hs - compiler/GHC/Settings.hs - compiler/GHC/Settings/IO.hs - compiler/GHC/StgToCmm.hs - compiler/GHC/StgToCmm/Bind.hs - compiler/GHC/StgToCmm/Closure.hs - compiler/GHC/StgToCmm/Env.hs - compiler/GHC/StgToCmm/Expr.hs - compiler/GHC/StgToCmm/Foreign.hs - compiler/GHC/StgToCmm/Heap.hs - compiler/GHC/StgToCmm/InfoTableProv.hs - compiler/GHC/StgToCmm/Layout.hs - compiler/GHC/StgToCmm/Prim.hs - compiler/GHC/StgToCmm/Prof.hs - compiler/GHC/StgToCmm/Ticky.hs - compiler/GHC/StgToCmm/Utils.hs - compiler/GHC/Tc/Module.hs - compiler/ghc.cabal.in - configure.ac - − docs/users_guide/10.0.1-notes.rst - + docs/users_guide/10.2.1-notes.rst - − docs/users_guide/9.16.1-notes.rst - docs/users_guide/conf.py - docs/users_guide/ghc_config.py.in - − docs/users_guide/ghc_packages.py - docs/users_guide/release-notes.rst - ghc/ghc-bin.cabal.in - hadrian/bindist/Makefile - hadrian/hadrian.cabal - hadrian/src/CommandLine.hs - hadrian/src/Main.hs - hadrian/src/Packages.hs - + hadrian/src/Rules/Changelog.hs - hadrian/src/Rules/Documentation.hs - hadrian/src/Rules/Generate.hs - hadrian/src/Rules/Test.hs - hadrian/src/Settings/Default.hs - libraries/array - libraries/base/base.cabal.in - libraries/deepseq - libraries/directory - libraries/exceptions - libraries/file-io - libraries/filepath - libraries/ghc-boot-th/ghc-boot-th.cabal.in - libraries/ghc-boot/ghc-boot.cabal.in - libraries/ghc-compact/ghc-compact.cabal - libraries/ghc-experimental/ghc-experimental.cabal.in - libraries/ghc-prim/changelog.md - libraries/ghc-prim/ghc-prim.cabal - libraries/ghci/ghci.cabal.in - libraries/haskeline - libraries/hpc - libraries/os-string - libraries/parsec - libraries/process - libraries/semaphore-compat - libraries/stm - libraries/template-haskell-lift - libraries/template-haskell-quasiquoter - libraries/template-haskell/template-haskell.cabal.in - libraries/terminfo - libraries/unix - m4/fp_setup_project_version.m4 - m4/fptools_ghc_version.m4 - testsuite/mk/boilerplate.mk - + testsuite/tests/ghci/scripts/T26233.script - + testsuite/tests/ghci/scripts/T26233.stderr - + testsuite/tests/ghci/scripts/T26233.stdout - testsuite/tests/ghci/scripts/all.T - testsuite/tests/linters/Makefile - testsuite/tests/linters/all.T - + testsuite/tests/linters/changelog-d.stdout - + utils/changelog-d/ChangelogD.hs - + utils/changelog-d/LICENSE - + utils/changelog-d/README.md - + utils/changelog-d/changelog-d.cabal - utils/haddock/haddock-api/haddock-api.cabal - utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs - utils/haddock/haddock-library/haddock-library.cabal - utils/haddock/haddock-test/haddock-test.cabal - utils/haddock/haddock.cabal - utils/hsc2hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d8ea755cfdadfe6e3507f0aff93471… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d8ea755cfdadfe6e3507f0aff93471… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/spj-reinstallable-base] Wibbles
by Simon Peyton Jones (＠simonpj) 12 Apr '26

12 Apr '26

Simon Peyton Jones pushed to branch wip/spj-reinstallable-base at Glasgow Haskell Compiler / GHC Commits: 27ddaf23 by Simon Peyton Jones at 2026-04-12T16:38:50+01:00 Wibbles - - - - - 2 changed files: - compiler/GHC/Builtin/KnownOccs.hs - libraries/ghc-internal/src/GHC/Internal/List.hs Changes: ===================================== compiler/GHC/Builtin/KnownOccs.hs ===================================== @@ -89,7 +89,7 @@ knownOccs , enumFromToClassOpOcc, enumFromThenToClassOpOcc -- Static - , fromStaticPtrClassOpOcc + , fromStaticPtrClassOpOcc -- Typeable stuff , someTypeRepTyConOcc, someTypeRepDataConOcc, mkTrConOcc, mkTrAppCheckedOcc ===================================== libraries/ghc-internal/src/GHC/Internal/List.hs ===================================== @@ -46,7 +46,6 @@ module GHC.Internal.List ( import GHC.Internal.Base import GHC.Internal.Data.Maybe import GHC.Internal.Err (error) -import GHC.Internal.Magic (oneShot) import GHC.Internal.Num (Num(..)) import GHC.Internal.Bignum.Integer (Integer) import GHC.Internal.Prim (seq) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/27ddaf2385a03eb30c0fc4209a18f33… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/27ddaf2385a03eb30c0fc4209a18f33… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T26989] Wibbles
by Simon Peyton Jones (＠simonpj) 11 Apr '26

11 Apr '26

Simon Peyton Jones pushed to branch wip/T26989 at Glasgow Haskell Compiler / GHC Commits: 76ed405c by Simon Peyton Jones at 2026-04-11T22:59:23+01:00 Wibbles - - - - - 3 changed files: - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Driver/Config/Core/Lint.hs Changes: ===================================== compiler/GHC/Core/Lint.hs ===================================== @@ -1067,7 +1067,13 @@ lintIdOcc in_id nargs checkL (idName in_id /= makeStaticName) $ text "Found makeStatic nested in an expression" - ; checkDeadIdOcc in_id + -- Occurrences of an Id should never be dead.... + -- except in a couple of special cases + -- See Note [Dead occurrences] + ; flags <- getLintFlags + ; checkL (not (isDeadOcc (idOccInfo in_id)) + || lf_allow_dead_occs flags) + (text "Occurrence of a dead Id" <+> ppr in_id) ; case isDataConId_maybe in_id of Nothing -> return () @@ -1078,7 +1084,17 @@ lintIdOcc in_id nargs ; return (out_ty, usage) } - +{- Note [Dead occurrences] +~~~~~~~~~~~~~~~~~~~~~~~~~~ +An occurrence of an Id whose binder is marked as dead is usually +a mistake. But + * For the RULE forall a b. f [a,b] = g a + we mark `b` as dead because it is unused in the body, even though + it is of course used in the patterns + * For case patterns... I don't really understand, but it dates back a long way + +We permit these dead occurrences by setting the flag `lf_allow_dead_occs` +-} lintCoreFun :: CoreExpr -> Int -- Number of arguments (type or val) being passed @@ -1104,17 +1120,6 @@ lintLambda var lintBody = do { (body_ty, ue) <- lintBody ; ue' <- checkLinearity ue var' ; return (mkLamType var' body_ty, ue') } ------------------- -checkDeadIdOcc :: Id -> LintM () --- Occurrences of an Id should never be dead.... --- except when we are checking a case pattern -checkDeadIdOcc id - | isDeadOcc (idOccInfo id) - = do { in_case <- inCasePat - ; checkL in_case - (text "Occurrence of a dead Id" <+> ppr id) } - | otherwise - = return () ------------------ lintJoinBndrType :: OutType -- Type of the body @@ -1737,7 +1742,8 @@ lintCoreAlt case_bndr scrut_ty _scrut_mult alt_ty alt@(Alt (DataAlt con) args rh -- And now bring the new binders into scope ; lintBinders CasePatBind args $ \ args' -> do { rhs_ue <- lintAltExpr rhs alt_ty - ; rhs_ue' <- addLoc (CasePat alt) $ + ; rhs_ue' <- allowDeadOccs $ -- See Note [Dead occurrences] + addLoc (CasePat alt) $ lintAltBinders rhs_ue case_bndr scrut_ty con_payload_ty (zipEqual multiplicities args') ; return $ deleteUE rhs_ue' case_bndr @@ -2221,7 +2227,8 @@ lintCoreRule fun fun_ty rule@(Rule { ru_name = name, ru_bndrs = bndrs = noMultiplicityChecks $ -- Skip linearity checking for rules -- See Note [Linting linearity] lintBinders LambdaBind bndrs $ \ _ -> - do { (lhs_ty, _) <- lintCoreArgs (fun_ty, zeroUE) args + do { (lhs_ty, _) <- allowDeadOccs $ -- See Note [Dead occurrences] + lintCoreArgs (fun_ty, zeroUE) args ; (rhs_ty, _) <- case idJoinPointHood fun of JoinPoint join_arity -> do { checkL (args `lengthIs` join_arity) $ @@ -2999,7 +3006,8 @@ data LintFlags , lf_check_linearity :: Bool -- ^ See Note [Linting linearity] , lf_check_fixed_rep :: Bool -- ^ See Note [Checking for representation polymorphism] , lf_check_rubbish_lits :: Bool -- ^ See Note [Checking for rubbish literals] - , lf_allow_weak_joins :: Bool -- ^ See Note [Linting join points with casts or ticks] + , lf_allow_weak_joins :: Bool -- ^ See Note [Linting join points with casts or ticks] + , lf_allow_dead_occs :: Bool -- ^ See Note [Dead occurrences] } -- See Note [Checking StaticPtrs] @@ -3366,6 +3374,10 @@ noMultiplicityChecks :: LintM a -> LintM a noMultiplicityChecks = updLintFlags $ \ flags -> flags { lf_check_linearity = False } +allowDeadOccs :: LintM a -> LintM a +allowDeadOccs = + updLintFlags $ \ flags -> flags { lf_allow_dead_occs = True } + getLintFlags :: LintM LintFlags getLintFlags = LintM $ \ env errs -> fromBoxedLResult (Just (le_flags env), errs) @@ -3429,12 +3441,6 @@ addLoc extra_loc m = LintM $ \ env errs -> unLintM m (env { le_loc = extra_loc : le_loc env }) errs -inCasePat :: LintM Bool -- A slight hack; see the unique call site -inCasePat = LintM $ \ env errs -> fromBoxedLResult (Just (is_case_pat env), errs) - where - is_case_pat (LE { le_loc = CasePat {} : _ }) = True - is_case_pat _other = False - addInScopeId :: InId -> OutType -> (OutId -> LintM a) -> LintM a -- Unlike addInScopeTyCoVar, this function does no cloning; Ids never get cloned addInScopeId in_id out_ty thing_inside ===================================== compiler/GHC/Core/Opt/Simplify/Iteration.hs ===================================== @@ -1873,9 +1873,6 @@ simpl_lam env bndr body (ApplyToVal { sc_arg = arg, sc_env = arg_se , not (needsCaseBindingL arg_levity arg) -- Ok to test arg::InExpr in needsCaseBinding because -- exprOkForSpeculation is stable under simplification - , not ( isSimplified dup && -- See (SR2) in Note [Avoiding simplifying repeatedly] - not (exprIsTrivial arg) && - not (isDeadOcc (idOccInfo bndr)) ) -> do { simplTrace "SimplBindr:inline-uncond3" (ppr bndr <+> text ":=" <+> ppr arg $$ ppr (seIdSubst env)) $ tick (PreInlineUnconditionally bndr) ; simplLam env' body cont } @@ -2056,6 +2053,8 @@ Wrinkles: is no danger of simplifying repeatedly. But there is a benefit: it can save a simplifier iteration. So we check for that. + ToDo: I have improved this via simplOutExpr + ************************************************************************ * * ===================================== compiler/GHC/Driver/Config/Core/Lint.hs ===================================== @@ -116,7 +116,8 @@ perPassFlags dflags pass , lf_check_static_ptrs = check_static_ptrs , lf_check_linearity = check_linearity , lf_check_rubbish_lits = check_rubbish - , lf_allow_weak_joins = allow_weak_joins } + , lf_allow_weak_joins = allow_weak_joins + , lf_allow_dead_occs = False } where -- See Note [Checking for global Ids] check_globals = case pass of @@ -175,4 +176,5 @@ defaultLintFlags dflags = LF { lf_check_global_ids = False , lf_check_fixed_rep = True , lf_check_rubbish_lits = True , lf_allow_weak_joins = False + , lf_allow_dead_occs = False } View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/76ed405cfbf9d63f274dc7f2a40e668… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/76ed405cfbf9d63f274dc7f2a40e668… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T26989] Wibbles
by Simon Peyton Jones (＠simonpj) 11 Apr '26

11 Apr '26

Simon Peyton Jones pushed to branch wip/T26989 at Glasgow Haskell Compiler / GHC Commits: 27d8694f by Simon Peyton Jones at 2026-04-11T22:05:02+01:00 Wibbles Better management of casts - - - - - 6 changed files: - compiler/GHC/Core.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/Simplify/Utils.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/IfaceToCore.hs Changes: ===================================== compiler/GHC/Core.hs ===================================== @@ -1968,6 +1968,11 @@ Given this decision it's vital that we do *always* do it. occurrence in f out of scope. This happened in #8892, where the unfolding in question was a DFun unfolding. +Wrinkles + +(OUR1) For a RULE, say, + forall x y. f (x,y) = x+y +ToDO ************************************************************************ * * ===================================== compiler/GHC/Core/Opt/OccurAnal.hs ===================================== @@ -27,7 +27,8 @@ core expression with (hopefully) improved usage information. module GHC.Core.Opt.OccurAnal ( occurAnalysePgm, - occurAnalyseExpr, occurAnalyseExpr_Prep, + occurAnalyseExpr, occurAnalyseBndrsAndExpr, + occurAnalyseExpr_Prep, zapLambdaBndrs ) where @@ -85,6 +86,14 @@ occurAnalyseExpr expr = expr' where WUD _ expr' = occAnal initOccEnv expr +occurAnalyseBndrsAndExpr :: [Var] -> CoreExpr -> ([Var], CoreExpr) +-- Occur-anal (\bs.e), but taking and returning `bs` and `e` separately +occurAnalyseBndrsAndExpr bndrs expr + = (bndrs', expr') + where + WUD usage expr' = occAnal initOccEnv expr + bndrs' = tagLamBinders usage bndrs + -- | A version of 'occurAnalyseExpr' suitable for CorePrep. -- -- Different from 'occurAnalyseExpr' due to (JCT3) ===================================== compiler/GHC/Core/Opt/Simplify/Iteration.hs ===================================== @@ -1219,9 +1219,21 @@ simplExprF1 _ (Type ty) cont simplExprF1 env (Var v) cont = {-#SCC "simplInId" #-} simplInId env v cont simplExprF1 env (Lit lit) cont = {-#SCC "rebuild" #-} rebuild env (Lit lit) cont simplExprF1 env (Tick t expr) cont = {-#SCC "simplTick" #-} simplTick env t expr cont -simplExprF1 env (Cast body co) cont = {-#SCC "simplCast" #-} simplCast env body co cont simplExprF1 env (Coercion co) cont = {-#SCC "simplCoercionF" #-} simplCoercionF env co cont +simplExprF1 env (Cast body co) cont + = do { co1 <- {-#SCC "simplCast-simplCoercion" #-} + simplCoercion env co + + ; cont1 <- {-#SCC "simplCast-addCoerce" #-} + if isReflCo co1 + then return cont -- See Note [Optimising reflexivity] + else pushCast env co1 cont + -- True <=> co1 is optimised + + ; {-#SCC "simplCast-simplExprF" #-} + simplExprF env body cont1 } + simplExprF1 env (App fun arg) cont = {-#SCC "simplExprF1-App" #-} case arg of Type ty -> do { -- The argument type will (almost) certainly be used @@ -1567,6 +1579,10 @@ rebuild_go env expr cont Stop {} -> return (emptyFloats env, expr) TickIt t cont -> rebuild_go env (mkTick t expr) cont CastIt { sc_co = co, sc_opt = opt, sc_cont = cont } + | isReflexiveCo co' -- Worth trying this because casts can + -- get stacked up by simplCast + -> rebuild_go env expr cont + | otherwise -> rebuild_go env (mkCast expr co') cont -- NB: mkCast implements the (Coercion co |> g) optimisation where @@ -1689,9 +1705,8 @@ on each successive composition -- that's at least quadratic. So: * In `addCoerce` (in `simplCast`) if we combine this new coercion with an existing once, we build a CastIt for (co1 ; co2) with sc_opt=False. -* When unpacking a CastIt, in `rebuildCall` and `rebuild`, we optimise - the (presumably composed) coercion if sc_opt=False; this is done - by `optOutCoercion`. +* When unpacking a CastIt, in `rebuild`, we optimise the (presumably + composed) coercion if sc_opt=False; this is done by `optOutCoercion`. * When duplicating a continuation in `mkDupableContWithDmds`, before duplicating a CastIt, optimise the coercion. Otherwise we'll end up @@ -1708,76 +1723,70 @@ optOutCoercion env co already_optimised empty_subst = mkEmptySubst (seInScope env) opts = seOptCoercionOpts env -simplCast :: SimplEnv -> InExpr -> InCoercion -> SimplCont - -> SimplM (SimplFloats, OutExpr) -simplCast env body co0 cont0 - = do { co1 <- {-#SCC "simplCast-simplCoercion" #-} simplCoercion env co0 - ; cont1 <- {-#SCC "simplCast-addCoerce" #-} - if isReflCo co1 - then return cont0 -- See Note [Optimising reflexivity] - else addCoerce co1 True cont0 - -- True <=> co1 is optimised - ; {-#SCC "simplCast-simplExprF" #-} simplExprF env body cont1 } +pushCast :: SimplEnv -> OutCoercion -> SimplCont -> SimplM SimplCont +pushCast env co cont + = go co True cont where + go :: OutCoercion -> Bool -> SimplCont -> SimplM SimplCont + go co1 _ (CastIt { sc_co = co2, sc_cont = cont }) -- See Note [Optimising reflexivity] + = go (mkTransCo co1 co2) False cont + -- False: (mkTransCo co1 co2) is not fully optimised + -- See Note [Avoid re-simplifying coercions] + + go co co_is_opt (ApplyToTy { sc_arg_ty = arg_ty, sc_cont = tail }) + | Just (arg_ty', m_co') <- pushCoTyArg co arg_ty + = {-#SCC "addCoerce-pushCoTyArg" #-} + do { tail' <- go_mco m_co' co_is_opt tail + ; return (ApplyToTy { sc_arg_ty = arg_ty' + , sc_cont = tail' + , sc_hole_ty = coercionLKind co }) } + -- NB! As the cast goes past, the + -- type of the hole changes (#16312) + + -- (f |> co) e ===> (f (e |> co1)) |> co2 + -- where co :: (s1->s2) ~ (t1->t2) + -- co1 :: t1 ~ s1 + -- co2 :: s2 ~ t2 + go co co_is_opt cont@(ApplyToVal { sc_arg = arg, sc_env = arg_se + , sc_dup = dup, sc_cont = tail + , sc_hole_ty = fun_ty }) + | not co_is_opt + = -- pushCoValArg duplicates the coercion, so optimise first + go (optOutCoercion (zapSubstEnv env) co co_is_opt) True cont + + | Just (m_co1, m_co2) <- pushCoValArg co + = {-#SCC "addCoerce-pushCoValArg" #-} + do { tail' <- go_mco m_co2 co_is_opt tail + ; case m_co1 of { + MRefl -> return (cont { sc_cont = tail' + , sc_hole_ty = coercionLKind co }) ; + -- See Note [Avoiding simplifying repeatedly] + + MCo co1 -> + do { (dup', arg_se', arg') <- simplLazyArg env dup fun_ty Nothing arg_se arg + -- When we build the ApplyTo we can't mix the OutCoercion + -- 'co' with the InExpr 'arg', so we simplify + -- to make it all consistent. It's a bit messy. + -- But it isn't a common case. + -- Example of use: #995 + ; return (ApplyToVal { sc_arg = mkCast arg' co1 + , sc_env = arg_se' + , sc_dup = dup' + , sc_cont = tail' + , sc_hole_ty = coercionLKind co }) } } } + + go co co_is_opt cont + | isReflCo co = return cont -- Having this at the end makes a huge + -- difference in T12227, for some reason + -- See Note [Optimising reflexivity] + | otherwise = return (CastIt { sc_co = co, sc_opt = co_is_opt, sc_cont = cont }) + -- If the first parameter is MRefl, then simplifying revealed a -- reflexive coercion. Omit. - addCoerceM :: MOutCoercion -> Bool -> SimplCont -> SimplM SimplCont - addCoerceM MRefl _ cont = return cont - addCoerceM (MCo co) opt cont = addCoerce co opt cont - - addCoerce :: OutCoercion -> Bool -> SimplCont -> SimplM SimplCont - addCoerce co1 _ (CastIt { sc_co = co2, sc_cont = cont }) -- See Note [Optimising reflexivity] - = addCoerce (mkTransCo co1 co2) False cont - -- False: (mkTransCo co1 co2) is not fully optimised - -- See Note [Avoid re-simplifying coercions] - - addCoerce co co_is_opt (ApplyToTy { sc_arg_ty = arg_ty, sc_cont = tail }) - | Just (arg_ty', m_co') <- pushCoTyArg co arg_ty - = {-#SCC "addCoerce-pushCoTyArg" #-} - do { tail' <- addCoerceM m_co' co_is_opt tail - ; return (ApplyToTy { sc_arg_ty = arg_ty' - , sc_cont = tail' - , sc_hole_ty = coercionLKind co }) } - -- NB! As the cast goes past, the - -- type of the hole changes (#16312) - - -- (f |> co) e ===> (f (e |> co1)) |> co2 - -- where co :: (s1->s2) ~ (t1->t2) - -- co1 :: t1 ~ s1 - -- co2 :: s2 ~ t2 - addCoerce co co_is_opt cont@(ApplyToVal { sc_arg = arg, sc_env = arg_se - , sc_dup = dup, sc_cont = tail - , sc_hole_ty = fun_ty }) - | not co_is_opt -- pushCoValArg duplicates the coercion, so optimise first - = addCoerce (optOutCoercion (zapSubstEnv env) co co_is_opt) True cont - - | Just (m_co1, m_co2) <- pushCoValArg co - = {-#SCC "addCoerce-pushCoValArg" #-} - do { tail' <- addCoerceM m_co2 co_is_opt tail - ; case m_co1 of { - MRefl -> return (cont { sc_cont = tail' - , sc_hole_ty = coercionLKind co }) ; - -- See Note [Avoiding simplifying repeatedly] - - MCo co1 -> - do { (dup', arg_se', arg') <- simplLazyArg env dup fun_ty Nothing arg_se arg - -- When we build the ApplyTo we can't mix the OutCoercion - -- 'co' with the InExpr 'arg', so we simplify - -- to make it all consistent. It's a bit messy. - -- But it isn't a common case. - -- Example of use: #995 - ; return (ApplyToVal { sc_arg = mkCast arg' co1 - , sc_env = arg_se' - , sc_dup = dup' - , sc_cont = tail' - , sc_hole_ty = coercionLKind co }) } } } - - addCoerce co co_is_opt cont - | isReflCo co = return cont -- Having this at the end makes a huge - -- difference in T12227, for some reason - -- See Note [Optimising reflexivity] - | otherwise = return (CastIt { sc_co = co, sc_opt = co_is_opt, sc_cont = cont }) + go_mco :: MOutCoercion -> Bool -> SimplCont -> SimplM SimplCont + go_mco MRefl _ cont = return cont + go_mco (MCo co) opt cont = go co opt cont simplLazyArg :: SimplEnvIS -- ^ Used only for its InScopeSet -> DupFlag @@ -2293,14 +2302,21 @@ simplInId env var cont --------------------------------------------------------- simplOutExpr :: SimplEnvIS -> OutExpr -> SimplCont -> SimplM (SimplFloats, OutExpr) simplOutExpr env expr cont - = case fun of - Var v -> simplOutId env v cont' - Lam {} | not (null args) -> simplLam env occ_fun cont' -- We have a beta-redex - _ -> rebuild_go env expr cont - where - (fun, args) = collectArgs expr - cont' = pushArgs env Simplified (exprType fun) args cont - occ_fun = occurAnalyseExpr fun -- ToDo:explain; c.f. Note [Occurrence-analyse after rule firing] + | Lam {} <- expr + , hasArgs cont + = simplLam env (occurAnalyseExpr expr) cont + -- ToDo:explain; c.f. Note [Occurrence-analyse after rule firing] + + | Cast e co <- expr -- The inlined expression may be (x |> co) + -- and the cast may cancel with `cont` + = do { cont' <- pushCast env co cont + ; simplOutExpr env e cont' } + + | (Var v, args) <- collectArgs expr + = simplOutId env v (pushArgs env (idType v) args cont) + + | otherwise + = rebuild_go env expr cont --------------------------------------------------------- simplOutId :: SimplEnvIS -> OutId -> SimplCont -> SimplM (SimplFloats, OutExpr) @@ -2654,7 +2670,7 @@ fireRuleAFTER env rule_match arg_specs cont , rm_binds = wrap, rm_bndrs = bndrs } <- rule_match = do { let env' = env `addNewInScopeIds` bndrs ; (floats, e') <- simplExprF env' rhs $ - pushArgs env' Simplified (exprType rhs) rhs_args $ + pushArgs env' (exprType rhs) rhs_args $ pushArgSpecs env' (drop (ruleArity rule) arg_specs) cont ; return $ if isEmptyBindWrapper wrap -- Not very pretty ===================================== compiler/GHC/Core/Opt/Simplify/Utils.hs ===================================== @@ -25,7 +25,7 @@ module GHC.Core.Opt.Simplify.Utils ( isSimplified, contIsStop, contIsDupable, contResultType, contHoleType, contHoleScaling, contIsTrivial, contArgs, contIsRhs, - countArgs, contOutArgs, dropContArgs, + hasArgs, countArgs, contOutArgs, dropContArgs, mkBoringStop, mkRhsStop, mkLazyArgStop, interestingCallContext, @@ -384,17 +384,17 @@ isStrictArgInfo (ArgInfo { ai_dmds = dmds }) | dmd:_ <- dmds = isStrUsedDmd dmd | otherwise = False -pushArgs :: SimplEnvIS -> DupFlag -> Type -> [OutExpr] -> SimplCont -> SimplCont -pushArgs _env _dup _fun_ty [] cont +pushArgs :: SimplEnvIS -> Type -> [OutExpr] -> SimplCont -> SimplCont +pushArgs _env _fun_ty [] cont = cont -pushArgs env dup fun_ty (arg:args) cont +pushArgs env fun_ty (arg:args) cont | Type ty <- arg = ApplyToTy { sc_hole_ty = fun_ty, sc_arg_ty = ty - , sc_cont = pushArgs env dup (piResultTy fun_ty ty) args cont } + , sc_cont = pushArgs env (piResultTy fun_ty ty) args cont } | otherwise - = ApplyToVal { sc_dup = dup, sc_hole_ty = fun_ty + = ApplyToVal { sc_dup = Simplified, sc_hole_ty = fun_ty , sc_arg = arg, sc_env = env - , sc_cont = pushArgs env dup (funResultTy fun_ty) args cont} + , sc_cont = pushArgs env (funResultTy fun_ty) args cont} pushArgSpecs :: SimplEnvIS -- Barely needed, since sc_dup = Simplified -> [ArgSpec] -- In normal, forward order @@ -522,6 +522,12 @@ contHoleScaling (ApplyToVal { sc_cont = k }) = contHoleScaling k contHoleScaling (TickIt _ k) = contHoleScaling k ------------------- +hasArgs :: SimplCont -> Bool +-- True <=> some leading arguments +hasArgs (ApplyToTy {}) = True +hasArgs (ApplyToVal {}) = True +hasArgs _ = False + countArgs :: SimplCont -> Int -- Count all arguments, including types, coercions, -- and other values; skipping over casts. ===================================== compiler/GHC/Core/Rules.hs ===================================== @@ -65,7 +65,7 @@ import GHC.Core.Tidy ( tidyRules ) import GHC.Core.Map.Expr ( eqCoreExpr ) import GHC.Core.Opt.Arity( etaExpandToJoinPointRule ) import GHC.Core.Make ( mkCoreLams ) -import GHC.Core.Opt.OccurAnal( occurAnalyseExpr ) +import GHC.Core.Opt.OccurAnal( occurAnalyseBndrsAndExpr ) import GHC.Core.Rules.Config (roBuiltinRules) import GHC.Tc.Utils.TcType ( tcSplitTyConApp_maybe ) @@ -200,16 +200,18 @@ mkRule this_mod is_auto is_local name act fn bndrs args rhs = Rule { ru_name = name , ru_act = act , ru_fn = fn - , ru_bndrs = bndrs + , ru_bndrs = bndrs' , ru_args = args - , ru_rhs = occurAnalyseExpr rhs - -- See Note [OccInfo in unfoldings and rules] + , ru_rhs = rhs' , ru_rough = roughTopNames args , ru_origin = this_mod , ru_orphan = orph , ru_auto = is_auto , ru_local = is_local } where + (bndrs', rhs') = occurAnalyseBndrsAndExpr bndrs rhs + -- See Note [OccInfo in unfoldings and rules] + -- Compute orphanhood. See Note [Orphans] in GHC.Core.InstEnv -- A rule is an orphan only if none of the variables -- mentioned on its left-hand side are locally defined ===================================== compiler/GHC/IfaceToCore.hs ===================================== @@ -76,7 +76,7 @@ import GHC.Core.Predicate( isUnaryClass ) import GHC.Core.TyCon import GHC.Core.ConLike import GHC.Core.DataCon -import GHC.Core.Opt.OccurAnal ( occurAnalyseExpr ) +import GHC.Core.Opt.OccurAnal ( occurAnalyseBndrsAndExpr ) import GHC.Core.Ppr import GHC.Hs.Extension ( GhcRn ) @@ -1418,18 +1418,22 @@ tcIfaceRule (IfaceRule {ifRuleName = name, ifActivation = act, ifRuleBndrs = bnd (emptyBag, errs) } ; return (bndrs', args', rhs') } ; let mb_tcs = map ifTopFreeName args + (bndrs_occ, rhs_occ) = occurAnalyseBndrsAndExpr bndrs' rhs' + -- See Note [OccInfo in unfoldings and rules] ; this_mod <- getIfModule - ; return (Rule { ru_name = name, ru_fn = fn, - ru_act = act, - ru_bndrs = bndrs', ru_args = args', - ru_rhs = occurAnalyseExpr rhs', - ru_rough = mb_tcs, - ru_origin = this_mod, - ru_orphan = orph, - ru_auto = auto, - ru_local = False }) } -- An imported RULE is never for a local Id - -- or, even if it is (module loop, perhaps) - -- we'll just leave it in the non-local set + ; return (Rule { ru_name = name + , ru_fn = fn + , ru_act = act + , ru_bndrs = bndrs_occ + , ru_args = args' + , ru_rhs = rhs_occ + , ru_rough = mb_tcs + , ru_origin = this_mod + , ru_orphan = orph + , ru_auto = auto + , ru_local = False }) } + -- ru_local=False: an imported RULE is never for a local Id or, even if + -- it is (module loop, perhaps) we'll just leave it in the non-local set where -- This function *must* mirror exactly what Rules.roughTopNames does -- We could have stored the ru_rough field in the iface file View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/27d8694fc3cbecf96dc78924ecfac51… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/27d8694fc3cbecf96dc78924ecfac51… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/jeltsch/more-efficient-home-unit-imports-finding] Improve naming
by Wolfgang Jeltsch (＠jeltsch) 11 Apr '26

11 Apr '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/more-efficient-home-unit-imports-finding at Glasgow Haskell Compiler / GHC Commits: d99388ed by Wolfgang Jeltsch at 2026-04-11T21:47:00+03:00 Improve naming - - - - - 2 changed files: - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/Module/Graph.hs Changes: ===================================== compiler/GHC/Unit/Finder.hs ===================================== @@ -44,7 +44,11 @@ import GHC.Data.OsPath import GHC.Unit.Env import GHC.Unit.Types import GHC.Unit.Module -import GHC.Unit.Module.Graph (ModuleNameHomeMap (..), mgHomeModuleMap) +import GHC.Unit.Module.Graph + ( + CompleteUnits (cu_inventory, cu_providers), + mgCompleteUnits + ) import GHC.Unit.Home import GHC.Unit.Home.Graph (UnitEnvGraph) import qualified GHC.Unit.Home.Graph as HUG @@ -178,13 +182,13 @@ getDirHash dir = do findImportedModule :: HscEnv -> ModuleName -> PkgQual -> IO FindResult findImportedModule hsc_env mod pkg_qual = - let fc = hsc_FC hsc_env - mhome_unit = hsc_home_unit_maybe hsc_env - dflags = hsc_dflags hsc_env - fopts = initFinderOpts dflags + let fc = hsc_FC hsc_env + mb_home_unit = hsc_home_unit_maybe hsc_env + dflags = hsc_dflags hsc_env + fopts = initFinderOpts dflags in do - let home_module_map = mgHomeModuleMap (hsc_mod_graph hsc_env) - findImportedModuleNoHsc fc fopts (hsc_unit_env hsc_env) home_module_map mhome_unit mod pkg_qual + let complete_home_units = mgCompleteUnits (hsc_mod_graph hsc_env) + findImportedModuleNoHsc fc fopts (hsc_unit_env hsc_env) complete_home_units mb_home_unit mod pkg_qual findImportedModuleWithIsBoot :: HscEnv -> ModuleName -> IsBootInterface -> PkgQual -> IO FindResult findImportedModuleWithIsBoot hsc_env mod is_boot pkg_qual = do @@ -197,27 +201,26 @@ findImportedModuleNoHsc :: FinderCache -> FinderOpts -> UnitEnv - -> ModuleNameHomeMap + -> CompleteUnits -> Maybe HomeUnit -> ModuleName -> PkgQual -> IO FindResult -findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = +findImportedModuleNoHsc fc fopts ue complete_home_units mb_home_unit mod_name mb_pkg = case mb_pkg of NoPkgQual -> unqual_import - ThisPkg uid | (homeUnitId <$> mhome_unit) == Just uid -> home_import + ThisPkg uid | (homeUnitId <$> mb_home_unit) == Just uid -> home_import | Just os <- lookup uid other_fopts -> home_pkg_import (uid, os) - | otherwise -> pprPanic "findImportModule" (ppr mod_name $$ ppr mb_pkg $$ ppr (homeUnitId <$> mhome_unit) $$ ppr uid $$ ppr (map fst all_opts)) + | otherwise -> pprPanic "findImportModule" (ppr mod_name $$ ppr mb_pkg $$ ppr (homeUnitId <$> mb_home_unit) $$ ppr uid $$ ppr (map fst all_opts)) OtherPkg _ -> pkg_import where - ModuleNameHomeMap complete_units module_name_map = home_module_map - module_home_units = M.findWithDefault Set.empty mod_name module_name_map - current_unit_id = homeUnitId <$> mhome_unit - all_opts = case current_unit_id of + cached_module_providers = M.findWithDefault Set.empty mod_name (cu_providers complete_home_units) + mb_home_unit_id = homeUnitId <$> mb_home_unit + all_opts = case mb_home_unit_id of Nothing -> other_fopts Just home_unit_id -> (home_unit_id, fopts) : other_fopts - home_import = case mhome_unit of + home_import = case mb_home_unit of Just home_unit -> findHomeModule fc fopts home_unit mod_name Nothing -> pure $ NoPackage (panic "findImportedModule: no home-unit") @@ -226,7 +229,7 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = -- If the module is reexported, then look for it as if it was from the perspective -- of that package which reexports it. | Just real_mod_name <- lookupUniqMap (finder_reexportedModules opts) mod_name = - findImportedModuleNoHsc fc opts ue home_module_map (Just $ DefiniteHomeUnit uid Nothing) real_mod_name NoPkgQual + findImportedModuleNoHsc fc opts ue complete_home_units (Just $ DefiniteHomeUnit uid Nothing) real_mod_name NoPkgQual | elementOfUniqSet mod_name (finder_hiddenModules opts) = return (mkHomeHidden uid) | otherwise = @@ -243,23 +246,23 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = `orIfNotFound` findExposedPackageModule fc fopts units mod_name NoPkgQual - units = case current_unit_id of + units = case mb_home_unit_id of Nothing -> ue_homeUnitState ue Just home_unit_id -> HUG.homeUnitEnv_units $ ue_findHomeUnitEnv home_unit_id ue hpt_deps :: Set.Set UnitId hpt_deps = homeUnitDepends units - dep_providers = Set.intersection module_home_units hpt_deps - known_other_uids = - let providers = maybe dep_providers (\u -> Set.delete u dep_providers) current_unit_id - in Set.toList providers - unknown_units = - let candidates = Set.difference hpt_deps complete_units - excluded = maybe dep_providers (\u -> Set.insert u dep_providers) current_unit_id + cached_providing_deps = Set.intersection cached_module_providers hpt_deps + other_cached_providing_deps = + Set.toList $ + maybe cached_providing_deps (\u -> Set.delete u cached_providing_deps) mb_home_unit_id + uncached_providing_deps = + let candidates = Set.difference hpt_deps (cu_inventory complete_home_units) + excluded = maybe cached_providing_deps (\u -> Set.insert u cached_providing_deps) mb_home_unit_id in Set.toList (Set.difference candidates excluded) - other_home_uids = known_other_uids ++ unknown_units + other_providing_deps = other_cached_providing_deps ++ uncached_providing_deps other_fopts = [ (uid, initFinderOpts (homeUnitEnv_dflags (ue_findHomeUnitEnv uid ue))) - | uid <- other_home_uids + | uid <- other_providing_deps ] -- | Locate a plugin module requested by the user, for a compiler @@ -278,15 +281,15 @@ findPluginModule :: HscEnv -> ModuleName -> IO FindResult findPluginModule hsc_env mod_name = do let fc = hsc_FC hsc_env let units = hsc_units hsc_env - let mhome_unit = hsc_home_unit_maybe hsc_env - findPluginModuleNoHsc fc (initFinderOpts (hsc_dflags hsc_env)) units mhome_unit mod_name + let mb_home_unit = hsc_home_unit_maybe hsc_env + findPluginModuleNoHsc fc (initFinderOpts (hsc_dflags hsc_env)) units mb_home_unit mod_name -- | A version of findExactModule which takes the exact parts of the HscEnv it needs -- directly. findExactModuleNoHsc :: FinderCache -> FinderOpts -> UnitEnvGraph FinderOpts -> UnitState -> Maybe HomeUnit -> InstalledModule -> IsBootInterface -> IO InstalledFindResult -findExactModuleNoHsc fc fopts other_fopts unit_state mhome_unit mod is_boot = do - res <- case mhome_unit of +findExactModuleNoHsc fc fopts other_fopts unit_state mb_home_unit mod is_boot = do + res <- case mb_home_unit of Just home_unit | isHomeInstalledModule home_unit mod -> findInstalledHomeModule fc fopts (homeUnitId home_unit) (moduleName mod) ===================================== compiler/GHC/Unit/Module/Graph.hs ===================================== @@ -67,8 +67,8 @@ module GHC.Unit.Module.Graph , mgLookupModule , mgLookupModuleName , mgHasHoles - , ModuleNameHomeMap (ModuleNameHomeMap) - , mgHomeModuleMap + , CompleteUnits (CompleteUnits, cu_inventory, cu_providers) + , mgCompleteUnits , showModMsg -- ** Reachability queries @@ -205,18 +205,21 @@ data ModuleGraph = ModuleGraph -- Cached computation, whether any of the ModuleGraphNode are isHoleModule, -- This is only used for a hack in GHC.Iface.Load to do with backpack, please -- remove this at the earliest opportunity. - , mg_home_map :: ModuleNameHomeMap + , mg_complete_units :: CompleteUnits -- ^ For each module name, which home unit UnitIds define it together with the set of units for which the listing is complete. } -data ModuleNameHomeMap = ModuleNameHomeMap !(Set UnitId) - !(Map ModuleName (Set UnitId)) +data CompleteUnits = CompleteUnits + { + cu_inventory :: !(Set UnitId), + cu_providers :: !(Map ModuleName (Set UnitId)) + } -mkHomeModuleMap :: [ModuleGraphNode] -> ModuleNameHomeMap -mkHomeModuleMap nodes = ModuleNameHomeMap completeUnits providerMap where +mkCompleteUnits :: [ModuleGraphNode] -> CompleteUnits +mkCompleteUnits nodes = CompleteUnits inventory providers where - providerMap :: Map ModuleName (Set UnitId) - providerMap + providers :: Map ModuleName (Set UnitId) + providers = Map.fromListWith Set.union $ [ (moduleName, Set.singleton unitID) | @@ -225,11 +228,11 @@ mkHomeModuleMap nodes = ModuleNameHomeMap completeUnits providerMap where let unitID = moduleNodeInfoUnitId moduleNodeInfo ] - completeUnits :: Set UnitId - completeUnits = Set.unions (Map.elems providerMap) + inventory :: Set UnitId + inventory = Set.unions (Map.elems providers) -mgHomeModuleMap :: ModuleGraph -> ModuleNameHomeMap -mgHomeModuleMap = mg_home_map +mgCompleteUnits :: ModuleGraph -> CompleteUnits +mgCompleteUnits = mg_complete_units -- | Why do we ever need to construct empty graphs? Is it because of one shot mode? emptyMG :: ModuleGraph @@ -237,7 +240,7 @@ emptyMG = ModuleGraph [] (graphReachability emptyGraph, const Nothing) (graphReachability emptyGraph, const Nothing) (graphReachability emptyGraph, const Nothing) False - (ModuleNameHomeMap Set.empty Map.empty) + (CompleteUnits Set.empty Map.empty) -- | Construct a module graph. This function should be the only entry point for -- building a 'ModuleGraph', since it is supposed to be built once and never modified. @@ -513,7 +516,7 @@ isEmptyMG = null . mg_mss mapMG :: (ModSummary -> ModSummary) -> ModuleGraph -> ModuleGraph mapMG f mg@ModuleGraph{..} = mg { mg_mss = new_mss - , mg_home_map = mkHomeModuleMap new_mss + , mg_complete_units = mkCompleteUnits new_mss } where new_mss = @@ -1086,7 +1089,7 @@ extendMG ModuleGraph{..} node = , mg_loop_graph = mkTransLoopDeps new_mss , mg_zero_graph = mkTransZeroDeps new_mss , mg_has_holes = mg_has_holes || maybe False isHsigFile (moduleNodeInfoHscSource =<< mgNodeIsModule node) - , mg_home_map = mkHomeModuleMap new_mss + , mg_complete_units = mkCompleteUnits new_mss } where new_mss = node : mg_mss View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d99388ed3e52d6fc4e90044835cb23e… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d99388ed3e52d6fc4e90044835cb23e… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/jeltsch/more-efficient-home-unit-imports-finding] Improve naming
by Wolfgang Jeltsch (＠jeltsch) 11 Apr '26

11 Apr '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/more-efficient-home-unit-imports-finding at Glasgow Haskell Compiler / GHC Commits: 943f569e by Wolfgang Jeltsch at 2026-04-11T21:21:55+03:00 Improve naming - - - - - 2 changed files: - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/Module/Graph.hs Changes: ===================================== compiler/GHC/Unit/Finder.hs ===================================== @@ -44,7 +44,11 @@ import GHC.Data.OsPath import GHC.Unit.Env import GHC.Unit.Types import GHC.Unit.Module -import GHC.Unit.Module.Graph (ModuleNameHomeMap (..), mgHomeModuleMap) +import GHC.Unit.Module.Graph + ( + CompleteUnits (cu_inventory, cu_providers), + mgCompleteUnits + ) import GHC.Unit.Home import GHC.Unit.Home.Graph (UnitEnvGraph) import qualified GHC.Unit.Home.Graph as HUG @@ -183,8 +187,8 @@ findImportedModule hsc_env mod pkg_qual = dflags = hsc_dflags hsc_env fopts = initFinderOpts dflags in do - let home_module_map = mgHomeModuleMap (hsc_mod_graph hsc_env) - findImportedModuleNoHsc fc fopts (hsc_unit_env hsc_env) home_module_map mhome_unit mod pkg_qual + let complete_home_units = mgCompleteUnits (hsc_mod_graph hsc_env) + findImportedModuleNoHsc fc fopts (hsc_unit_env hsc_env) complete_home_units mhome_unit mod pkg_qual findImportedModuleWithIsBoot :: HscEnv -> ModuleName -> IsBootInterface -> PkgQual -> IO FindResult findImportedModuleWithIsBoot hsc_env mod is_boot pkg_qual = do @@ -197,12 +201,12 @@ findImportedModuleNoHsc :: FinderCache -> FinderOpts -> UnitEnv - -> ModuleNameHomeMap + -> CompleteUnits -> Maybe HomeUnit -> ModuleName -> PkgQual -> IO FindResult -findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = +findImportedModuleNoHsc fc fopts ue complete_home_units mhome_unit mod_name mb_pkg = case mb_pkg of NoPkgQual -> unqual_import ThisPkg uid | (homeUnitId <$> mhome_unit) == Just uid -> home_import @@ -210,8 +214,7 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = | otherwise -> pprPanic "findImportModule" (ppr mod_name $$ ppr mb_pkg $$ ppr (homeUnitId <$> mhome_unit) $$ ppr uid $$ ppr (map fst all_opts)) OtherPkg _ -> pkg_import where - ModuleNameHomeMap complete_units module_name_map = home_module_map - module_home_units = M.findWithDefault Set.empty mod_name module_name_map + cached_module_providers = M.findWithDefault Set.empty mod_name (cu_providers complete_home_units) current_unit_id = homeUnitId <$> mhome_unit all_opts = case current_unit_id of Nothing -> other_fopts @@ -226,7 +229,7 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = -- If the module is reexported, then look for it as if it was from the perspective -- of that package which reexports it. | Just real_mod_name <- lookupUniqMap (finder_reexportedModules opts) mod_name = - findImportedModuleNoHsc fc opts ue home_module_map (Just $ DefiniteHomeUnit uid Nothing) real_mod_name NoPkgQual + findImportedModuleNoHsc fc opts ue complete_home_units (Just $ DefiniteHomeUnit uid Nothing) real_mod_name NoPkgQual | elementOfUniqSet mod_name (finder_hiddenModules opts) = return (mkHomeHidden uid) | otherwise = @@ -248,12 +251,12 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = Just home_unit_id -> HUG.homeUnitEnv_units $ ue_findHomeUnitEnv home_unit_id ue hpt_deps :: Set.Set UnitId hpt_deps = homeUnitDepends units - dep_providers = Set.intersection module_home_units hpt_deps + dep_providers = Set.intersection cached_module_providers hpt_deps known_other_uids = let providers = maybe dep_providers (\u -> Set.delete u dep_providers) current_unit_id in Set.toList providers unknown_units = - let candidates = Set.difference hpt_deps complete_units + let candidates = Set.difference hpt_deps (cu_inventory complete_home_units) excluded = maybe dep_providers (\u -> Set.insert u dep_providers) current_unit_id in Set.toList (Set.difference candidates excluded) other_home_uids = known_other_uids ++ unknown_units ===================================== compiler/GHC/Unit/Module/Graph.hs ===================================== @@ -67,8 +67,8 @@ module GHC.Unit.Module.Graph , mgLookupModule , mgLookupModuleName , mgHasHoles - , ModuleNameHomeMap (ModuleNameHomeMap) - , mgHomeModuleMap + , CompleteUnits (CompleteUnits, cu_inventory, cu_providers) + , mgCompleteUnits , showModMsg -- ** Reachability queries @@ -205,18 +205,21 @@ data ModuleGraph = ModuleGraph -- Cached computation, whether any of the ModuleGraphNode are isHoleModule, -- This is only used for a hack in GHC.Iface.Load to do with backpack, please -- remove this at the earliest opportunity. - , mg_home_map :: ModuleNameHomeMap + , mg_complete_units :: CompleteUnits -- ^ For each module name, which home unit UnitIds define it together with the set of units for which the listing is complete. } -data ModuleNameHomeMap = ModuleNameHomeMap !(Set UnitId) - !(Map ModuleName (Set UnitId)) +data CompleteUnits = CompleteUnits + { + cu_inventory :: !(Set UnitId), + cu_providers :: !(Map ModuleName (Set UnitId)) + } -mkHomeModuleMap :: [ModuleGraphNode] -> ModuleNameHomeMap -mkHomeModuleMap nodes = ModuleNameHomeMap completeUnits providerMap where +mkCompleteUnits :: [ModuleGraphNode] -> CompleteUnits +mkCompleteUnits nodes = CompleteUnits inventory providers where - providerMap :: Map ModuleName (Set UnitId) - providerMap + providers :: Map ModuleName (Set UnitId) + providers = Map.fromListWith Set.union $ [ (moduleName, Set.singleton unitID) | @@ -225,11 +228,11 @@ mkHomeModuleMap nodes = ModuleNameHomeMap completeUnits providerMap where let unitID = moduleNodeInfoUnitId moduleNodeInfo ] - completeUnits :: Set UnitId - completeUnits = Set.unions (Map.elems providerMap) + inventory :: Set UnitId + inventory = Set.unions (Map.elems providers) -mgHomeModuleMap :: ModuleGraph -> ModuleNameHomeMap -mgHomeModuleMap = mg_home_map +mgCompleteUnits :: ModuleGraph -> CompleteUnits +mgCompleteUnits = mg_complete_units -- | Why do we ever need to construct empty graphs? Is it because of one shot mode? emptyMG :: ModuleGraph @@ -237,7 +240,7 @@ emptyMG = ModuleGraph [] (graphReachability emptyGraph, const Nothing) (graphReachability emptyGraph, const Nothing) (graphReachability emptyGraph, const Nothing) False - (ModuleNameHomeMap Set.empty Map.empty) + (CompleteUnits Set.empty Map.empty) -- | Construct a module graph. This function should be the only entry point for -- building a 'ModuleGraph', since it is supposed to be built once and never modified. @@ -513,7 +516,7 @@ isEmptyMG = null . mg_mss mapMG :: (ModSummary -> ModSummary) -> ModuleGraph -> ModuleGraph mapMG f mg@ModuleGraph{..} = mg { mg_mss = new_mss - , mg_home_map = mkHomeModuleMap new_mss + , mg_complete_units = mkCompleteUnits new_mss } where new_mss = @@ -1086,7 +1089,7 @@ extendMG ModuleGraph{..} node = , mg_loop_graph = mkTransLoopDeps new_mss , mg_zero_graph = mkTransZeroDeps new_mss , mg_has_holes = mg_has_holes || maybe False isHsigFile (moduleNodeInfoHscSource =<< mgNodeIsModule node) - , mg_home_map = mkHomeModuleMap new_mss + , mg_complete_units = mkCompleteUnits new_mss } where new_mss = node : mg_mss View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/943f569e5e152ca2917266024f63beb… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/943f569e5e152ca2917266024f63beb… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/jeltsch/more-efficient-home-unit-imports-finding] Implement `completeUnits` based on `providerMap`
by Wolfgang Jeltsch (＠jeltsch) 11 Apr '26

11 Apr '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/more-efficient-home-unit-imports-finding at Glasgow Haskell Compiler / GHC Commits: 0ea88d7d by Wolfgang Jeltsch at 2026-04-11T20:42:01+03:00 Implement `completeUnits` based on `providerMap` - - - - - 1 changed file: - compiler/GHC/Unit/Module/Graph.hs Changes: ===================================== compiler/GHC/Unit/Module/Graph.hs ===================================== @@ -226,11 +226,7 @@ mkHomeModuleMap nodes = ModuleNameHomeMap completeUnits providerMap where ] completeUnits :: Set UnitId - completeUnits = Set.fromList $ - [ - moduleNodeInfoUnitId moduleNodeInfo | - ModuleNode _ moduleNodeInfo <- nodes - ] + completeUnits = Set.unions (Map.elems providerMap) mgHomeModuleMap :: ModuleGraph -> ModuleNameHomeMap mgHomeModuleMap = mg_home_map View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/0ea88d7dec780e34f938f798661a921… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/0ea88d7dec780e34f938f798661a921… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Pushed new branch wip/sjakobi/dcanon-local-binds-proposal
by Simon Jakobi (＠sjakobi2) 11 Apr '26

11 Apr '26

Simon Jakobi pushed new branch wip/sjakobi/dcanon-local-binds-proposal at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/sjakobi/dcanon-local-binds-pr… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/jeltsch/more-efficient-home-unit-imports-finding.jeltsch-experiment] Deleted 1 commit: Drop the construction and use of `other_fopts_map`
by Wolfgang Jeltsch (＠jeltsch) 11 Apr '26

11 Apr '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/more-efficient-home-unit-imports-finding.jeltsch-experiment at Glasgow Haskell Compiler / GHC WARNING: The push did not contain any new commits, but force pushed to delete the commits and changes below. Deleted commits: e49a16cd by Wolfgang Jeltsch at 2026-04-11T16:46:04+03:00 Drop the construction and use of `other_fopts_map` The map was only used for a single lookup, and directly performing the lookup in the original list is faster than constructing the map and then performing the lookup in the map. - - - - - 1 changed file: - compiler/GHC/Unit/Finder.hs Changes: ===================================== compiler/GHC/Unit/Finder.hs ===================================== @@ -206,7 +206,7 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = case mb_pkg of NoPkgQual -> unqual_import ThisPkg uid | (homeUnitId <$> mhome_unit) == Just uid -> home_import - | Just os <- M.lookup uid other_fopts_map -> home_pkg_import (uid, os) + | Just os <- lookup uid other_fopts -> home_pkg_import (uid, os) | otherwise -> pprPanic "findImportModule" (ppr mod_name $$ ppr mb_pkg $$ ppr (homeUnitId <$> mhome_unit) $$ ppr uid $$ ppr (map fst all_opts)) OtherPkg _ -> pkg_import where @@ -214,10 +214,8 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = module_home_units = M.findWithDefault Set.empty mod_name module_name_map current_unit_id = homeUnitId <$> mhome_unit all_opts = case current_unit_id of - Nothing -> other_fopts_list - Just home_unit_id -> (home_unit_id, fopts) : other_fopts_list - - other_fopts_map = M.fromList other_fopts_list + Nothing -> other_fopts + Just home_unit_id -> (home_unit_id, fopts) : other_fopts home_import = case mhome_unit of Just home_unit -> findHomeModule fc fopts home_unit mod_name @@ -237,7 +235,7 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = -- Do not be smart and change this to `foldr orIfNotFound home_import hs` as -- that is not the same!! home_import is first because we need to look within ourselves -- first before looking at the packages in order. - any_home_import = foldr1 orIfNotFound (home_import :| map home_pkg_import other_fopts_list) + any_home_import = foldr1 orIfNotFound (home_import :| map home_pkg_import other_fopts) pkg_import = findExposedPackageModule fc fopts units mod_name mb_pkg @@ -259,7 +257,7 @@ findImportedModuleNoHsc fc fopts ue home_module_map mhome_unit mod_name mb_pkg = excluded = maybe Set.empty Set.singleton {- maybe dep_providers (\u -> Set.insert u dep_providers) -} current_unit_id in Set.toList (Set.difference candidates excluded) other_home_uids = known_other_uids ++ unknown_units - other_fopts_list = + other_fopts = [ (uid, initFinderOpts (homeUnitEnv_dflags (ue_findHomeUnitEnv uid ue))) | uid <- other_home_uids ] View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/e49a16cd2bc74ba3602cfae10723e3d… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/e49a16cd2bc74ba3602cfae10723e3d… You're receiving this email because of your account on gitlab.haskell.org.

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