June 2026 - ghc-commits

[Git][ghc/ghc][wip/jeltsch/ghc-9-14-building-base] Make needs list empty
by Wolfgang Jeltsch (＠jeltsch) 29 Jun '26

29 Jun '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/ghc-9-14-building-base at Glasgow Haskell Compiler / GHC Commits: 18618de5 by Wolfgang Jeltsch at 2026-06-29T15:41:28+03:00 Make needs list empty - - - - - 1 changed file: - .gitlab-ci.yml Changes: ===================================== .gitlab-ci.yml ===================================== @@ -1146,9 +1146,7 @@ ghc-wasm-meta-unreg: base-build-with-ghc-914: stage: testing - needs: - - job: lint-author - optional: true + needs: [] dependencies: null image: "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb12:$DOCKER_REV" tags: View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/18618de5f1b981c6e11a649937b63ab… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/18618de5f1b981c6e11a649937b63ab… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/davide/windows-dlls] WIP export-all-symbols from hadrian
by David Eichmann (＠DavidEichmann) 29 Jun '26

29 Jun '26

David Eichmann pushed to branch wip/davide/windows-dlls at Glasgow Haskell Compiler / GHC Commits: 3b123ba6 by David Eichmann at 2026-06-29T13:34:39+01:00 WIP export-all-symbols from hadrian - - - - - 1 changed file: - hadrian/src/Settings/Builders/Ghc.hs Changes: ===================================== hadrian/src/Settings/Builders/Ghc.hs ===================================== @@ -139,6 +139,7 @@ ghcLinkArgs = builder (Ghc LinkHs) ? do [ arg "-dynamic" -- TODO what about windows? , isLibrary pkg ? pure [ "-shared", "-dynload", "deploy" ] + , isLibrary pkg ? isWinHost ? arg "-optl-Wl,--export-all-symbols" , notStage0 ? targetSupportsRPaths ? mconcat [ arg ("-optl-Wl,-rpath," ++ rpath) , isProgram pkg ? arg ("-optl-Wl,-rpath," ++ bindistRpath) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/3b123ba6347ddde444b0419207b4ac3… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/3b123ba6347ddde444b0419207b4ac3… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/jeltsch/ghc-9-14-building-base] Tweak the configuration to show directory contents
by Wolfgang Jeltsch (＠jeltsch) 29 Jun '26

29 Jun '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/ghc-9-14-building-base at Glasgow Haskell Compiler / GHC Commits: c1f754dd by Wolfgang Jeltsch at 2026-06-29T14:54:58+03:00 Tweak the configuration to show directory contents - - - - - 1 changed file: - .gitlab-ci.yml Changes: ===================================== .gitlab-ci.yml ===================================== @@ -1147,11 +1147,7 @@ ghc-wasm-meta-unreg: base-build-with-ghc-914: stage: testing needs: - - job: x86_64-linux-deb13-validate - optional: true - - job: nightly-x86_64-linux-deb13-validate - optional: true - - job: release-x86_64-linux-deb13-release + - job: lint-author optional: true dependencies: null image: "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb12:$DOCKER_REV" @@ -1159,18 +1155,8 @@ base-build-with-ghc-914: - x86_64-linux script: - | - ghc_version=9.14.1 - url=https://downloads.haskell.org/~ghc/${ghc_version}/ghc-${ghc_version}-x8… - curl "$url" >ghc-${ghc_version}.tar.xz - tar -xJf ghc-${ghc_version}.tar.xz - cd ghc-${ghc_version}-x86_64-unknown-linux - ./configure --prefix "$PWD/../ghc" - make install - cd - - printf '%s\n' 'To be continued …' - printf '%s\n' 'For now some debug output:' - shopt -s globstar - ls -l ghc/**/bin + pwd + ls -al .. . .* * rules: - *full-ci View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c1f754ddbac0ca3dcdc75af053c1eb8… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c1f754ddbac0ca3dcdc75af053c1eb8… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/jeltsch/ghc-9-14-building-base] Tweak the configuration to show directory contents
by Wolfgang Jeltsch (＠jeltsch) 29 Jun '26

29 Jun '26

Wolfgang Jeltsch pushed to branch wip/jeltsch/ghc-9-14-building-base at Glasgow Haskell Compiler / GHC Commits: 070f20f9 by Wolfgang Jeltsch at 2026-06-29T14:47:16+03:00 Tweak the configuration to show directory contents - - - - - 1 changed file: - .gitlab-ci.yml Changes: ===================================== .gitlab-ci.yml ===================================== @@ -1147,30 +1147,29 @@ ghc-wasm-meta-unreg: base-build-with-ghc-914: stage: testing needs: - - job: x86_64-linux-deb13-validate - optional: true - - job: nightly-x86_64-linux-deb13-validate - optional: true - - job: release-x86_64-linux-deb13-release + - job: lint-author optional: true +# - job: x86_64-linux-deb13-validate +# optional: true +# - job: nightly-x86_64-linux-deb13-validate +# optional: true +# - job: release-x86_64-linux-deb13-release +# optional: true dependencies: null image: "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb12:$DOCKER_REV" tags: - x86_64-linux script: - | - ghc_version=9.14.1 - url=https://downloads.haskell.org/~ghc/${ghc_version}/ghc-${ghc_version}-x8… - curl "$url" >ghc-${ghc_version}.tar.xz - tar -xJf ghc-${ghc_version}.tar.xz - cd ghc-${ghc_version}-x86_64-unknown-linux - ./configure --prefix "$PWD/../ghc" - make install - cd - - printf '%s\n' 'To be continued …' - printf '%s\n' 'For now some debug output:' - shopt -s globstar - ls -l ghc/**/bin +# ghc_version=9.14.1 +# url=https://downloads.haskell.org/~ghc/${ghc_version}/ghc-${ghc_version}-x8… +# curl "$url" >ghc-${ghc_version}.tar.xz +# tar -xJf ghc-${ghc_version}.tar.xz +# cd ghc-${ghc_version}-x86_64-unknown-linux +# ./configure --prefix "$PWD/../ghc" +# make install + pwd + ls -al .. . .* * rules: - *full-ci View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/070f20f943fbd3a80518e7aa436af74… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/070f20f943fbd3a80518e7aa436af74… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/davide/windows-dlls] WIP export-all-symbols from hadrian
by David Eichmann (＠DavidEichmann) 29 Jun '26

29 Jun '26

David Eichmann pushed to branch wip/davide/windows-dlls at Glasgow Haskell Compiler / GHC Commits: 5563df3a by David Eichmann at 2026-06-29T12:25:27+01:00 WIP export-all-symbols from hadrian - - - - - 1 changed file: - hadrian/src/Settings/Builders/Ghc.hs Changes: ===================================== hadrian/src/Settings/Builders/Ghc.hs ===================================== @@ -62,6 +62,7 @@ compileAndLinkHs = (builder (Ghc CompileHs) ||^ builder (Ghc LinkHs)) ? do [ arg "-fwrite-ide-info" , arg "-hiedir", arg hie_path ] + , isWinHost ? builder (Ghc LinkHs) ? arg "-optl-Wl,--export-all-symbols" , arg "-o", arg =<< getOutput ] compileC :: Args View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5563df3ac547d253d7919d52c363a6a… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5563df3ac547d253d7919d52c363a6a… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/andreask/arm-ffi] Expand CCallConv test
by Andreas Klebinger (＠AndreasK) 29 Jun '26

29 Jun '26

Andreas Klebinger pushed to branch wip/andreask/arm-ffi at Glasgow Haskell Compiler / GHC Commits: 98fa02eb by Andreas Klebinger at 2026-06-29T08:20:07+02:00 Expand CCallConv test On some platforms (e.g. arm64) we have invariants about zeroing the high bits of returned values we want to catch. - - - - - 3 changed files: - testsuite/tests/codeGen/should_run/CCallConv.hs - testsuite/tests/codeGen/should_run/CCallConv.stdout - testsuite/tests/codeGen/should_run/CCallConv_c.c Changes: ===================================== testsuite/tests/codeGen/should_run/CCallConv.hs ===================================== @@ -3,6 +3,7 @@ {-# LANGUAGE MagicHash #-} {-# LANGUAGE UnboxedTuples #-} {-# LANGUAGE UnliftedFFITypes #-} +{-# LANGUAGE ExtendedLiterals #-} -- | This test ensures that sub-word signed and unsigned parameters are correctly -- handed over to C functions. I.e. it asserts the calling-convention. @@ -16,6 +17,7 @@ import Data.Word import GHC.Exts import GHC.Int import System.IO +import GHC.Stack foreign import ccall "fun8" fun8 :: @@ -59,6 +61,31 @@ foreign import ccall "fun32" Int32# -> -- s1 Int64# -- result +foreign import ccall "shrink32" + shrink32 :: + Int64# -> -- a0 + Int32# -- result + +foreign import ccall "shrink16" + shrink16 :: + Int64# -> -- a0 + Int16# -- result + +foreign import ccall "shrink8" + shrink8 :: + Int64# -> -- a0 + Int8# -- result + +foreign import ccall "shrink32_16" + shrink32_16 :: + Int32# -> -- a0 + Int16# -- result + +foreign import ccall "shrink32_8" + shrink32_8 :: + Int32# -> -- a0 + Int8# -- result + foreign import ccall "funFloat" funFloat :: Float# -> -- a0 @@ -115,6 +142,16 @@ main = do hFlush stdout assertEqual expected_res32 (I64# res32) + -- Shrinking/zeroing of subword sizes + do + assertTrue# (shrink32 -1#Int64 `eq32` -1#Int32) + assertTrue# (shrink16 -1#Int64 `eq16` -1#Int16) + assertTrue# (shrink8 -1#Int64 `eq8` -1#Int8) + + assertTrue# (shrink32_16 -1#Int32 `eq16` -1#Int16) + assertTrue# (shrink32_8 -1#Int32 `eq8` -1#Int8) + + let resFloat :: Float = F# (funFloat 1.0# 1.1# 1.2# 1.3# 1.4# 1.5# 1.6# 1.7# 1.8# 1.9#) print $ "funFloat result:" ++ show resFloat hFlush stdout @@ -125,8 +162,26 @@ main = do hFlush stdout assertEqual (14.5 :: Double) resDouble +-- We want to avoid constant folding, hence we hide the eqInt# primops +{-# NOINLINE eq8 #-} +{-# NOINLINE eq16 #-} +{-# NOINLINE eq32 #-} +eq8 :: Int8# -> Int8# -> Int# +eq16 :: Int16# -> Int16# -> Int# +eq32 :: Int32# -> Int32# -> Int# +eq8 = eqInt8# +eq16 = eqInt16# +eq32 = eqInt32# + assertEqual :: (Eq a, Show a) => a -> a -> IO () assertEqual a b = if a == b then pure () else error $ show a ++ " =/= " ++ show b + +assertTrue# :: HasCallStack => Int# -> IO () +assertTrue# x = + case (I# x) of + 1 -> pure () + 0 -> error $ "assertTrue# failed" + ===================================== testsuite/tests/codeGen/should_run/CCallConv.stdout ===================================== @@ -34,6 +34,16 @@ a7: 0xffffffff -1 s0: 0xffffffff 4294967295 s1: 0xffffffff -1 "fun32 result:8589934582" +shrink32: +a0: 0xffffffffffffffff -1 +shrink16: +a0: 0xffffffffffffffff -1 +shrink8: +a0: 0xffffffffffffffff -1 +shrink32_16: +a0: 0xffffffff -1 +shrink32_8: +a0: 0xffffffff -1 funFloat: a0: 1.000000 a1: 1.100000 ===================================== testsuite/tests/codeGen/should_run/CCallConv_c.c ===================================== @@ -62,6 +62,51 @@ int64_t fun32(int32_t a0, uint32_t a1, int32_t a2, int32_t a3, int32_t a4, s1; } +int32_t shrink32(int64_t a0) { + printf("shrink32:\n"); + printf("a0: %#llx %lld\n", a0, a0); + + fflush(stdout); + + return a0; +} + +int16_t shrink16(int64_t a0) { + printf("shrink16:\n"); + printf("a0: %#llx %lld\n", a0, a0); + + fflush(stdout); + + return a0; +} + +int8_t shrink8(int64_t a0) { + printf("shrink8:\n"); + printf("a0: %#llx %lld\n", a0, a0); + + fflush(stdout); + + return a0; +} + +int16_t shrink32_16(int32_t a0) { + printf("shrink32_16:\n"); + printf("a0: %#x %d\n", a0, a0); + + fflush(stdout); + + return a0; +} + +int8_t shrink32_8(int32_t a0) { + printf("shrink32_8:\n"); + printf("a0: %#x %d\n", a0, a0); + + fflush(stdout); + + return a0; +} + float funFloat(float a0, float a1, float a2, float a3, float a4, float a5, float a6, float a7, float s0, float s1) { printf("funFloat:\n"); View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/98fa02eb0e652dee1eb9bbd670a2f2c… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/98fa02eb0e652dee1eb9bbd670a2f2c… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] EPA: Remove LocatedC / SrcSpanAnnC
by Marge Bot (＠marge-bot) 29 Jun '26

29 Jun '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: 8e4d4a78 by Alan Zimmerman at 2026-06-28T22:32:16-04:00 EPA: Remove LocatedC / SrcSpanAnnC This is part of a cleanup of the zoo of SrcSpanAnnXXX types for exact print annotations. This one removes SrcSpanAnnC used for storing exact print annotations for contexts. It replaces it with an explicit `HsContext` data type that carries the annotations and the context. So, replace type HsContext pass = [LHsType pass] with type HsContext pass = HsContextDetails pass (LHsType pass) data HsContextDetails pass arg = HsContext { hsc_ext :: !(XHsContext pass) , hsc_ctxt :: [arg] } | XHsContextDetails !(XXHsContextDetails pass) We need the parameterised HsContextDetails because it is used both for HsQual carrying 'LHsExpr p' and "normal" contexts carrying 'LHsType p'. - - - - - 36 changed files: - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Dump.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/ThToHs.hs - compiler/Language/Haskell/Syntax/Expr.hs - compiler/Language/Haskell/Syntax/Type.hs - testsuite/tests/ghc-api/T25121_status.stdout - testsuite/tests/parser/should_compile/DumpSemis.stderr - testsuite/tests/parser/should_compile/T15323.stderr - testsuite/tests/printer/Test24533.stdout - utils/check-exact/ExactPrint.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/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/Types.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/8e4d4a78f6b73adfe9cbb0a71213e0b… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/8e4d4a78f6b73adfe9cbb0a71213e0b… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Pushed new branch wip/fix-layout-stack-fcall
by Cheng Shao (＠TerrorJack) 29 Jun '26

29 Jun '26

Cheng Shao pushed new branch wip/fix-layout-stack-fcall at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/fix-layout-stack-fcall You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/sjakobi/T27176-clb] 67 commits: hadrian: Remove old package.conf files when generating new ones
by Simon Jakobi (＠sjakobi2) 29 Jun '26

29 Jun '26

Simon Jakobi pushed to branch wip/sjakobi/T27176-clb at Glasgow Haskell Compiler / GHC Commits: 5ac9ce7d by Zubin Duggal at 2026-06-10T21:26:32+05:30 hadrian: Remove old package.conf files when generating new ones Old package.conf files might exists with different hashes, causing issues like #26661 Fixes #26661 - - - - - c9015f09 by sheaf at 2026-06-11T12:40:28-04:00 Fix AArch64 clobbering bug for MUL2 On AArch64, the code generator could clobber one of the input operands when computing the lower bits of a MUL2 operation. This rendered invalid the subsequent computation of the high bits. This commit fixes that by using a temporary register. The register allocator can remove the redundant move in the common case when the registers do not conflict. Fixes #27046 - - - - - 7ab90288 by Rodrigo Mesquita at 2026-06-11T12:41:11-04:00 fix: make T27131 less flaky It seems that T27131 fails flakily in a race where we check the flag before the capability had the chance to process the mailbox which sets the flag. This seemingly should only happen if the capability ends up being the same for setting and checking the flag. - - - - - 8965cb76 by Marc Scholten at 2026-06-12T04:53:22-04:00 haddock: render modules concurrently - - - - - 8cc0b64a by Duncan Coutts at 2026-06-12T04:54:06-04:00 Promote HAVE_PREEMPTION from Timer.c to OSThreads.h We will want to know about HAVE_PREEMPTION in more places. HAVE_PREEMPTION tells us that we do have OS threads available, irrespective of whether THREADED is defined. In particular, HAVE_PREEMPTION is defined on all proper OSs, but not on WASM (and hyopthetically may not be true on some other platforms like micro-controllers, RTOSs, VM hypervisors etc). - - - - - cce574ed by Duncan Coutts at 2026-06-12T04:54:06-04:00 Define ACQUIRE_LOCK_ALWAYS and friends Fix issue #27335 Like the atomic _ALWAYS variants, these lock actions are always defined, rather than being dependent on whether we are in the THREADED case. All the "normal" LOCK macros are defined to be no-ops when !THREADED. The use case for the _ALWAYS variants is where we are using OS threads even in the non-threaded RTS. This includes everything to do with the timer/ticker thread, which is used in the non-threaded RTS too. In particular, we will want to use this for eventlog things, because the timer thread performs eventlogging concurrently with the main capability, even in the non-threaded RTS. - - - - - 1f28d1f6 by Duncan Coutts at 2026-06-12T04:54:06-04:00 Use ACQUIRE/RELEASE_LOCK_ALWAYS with eventBufMutex Even in the non-threaded RTS the eventBufMutex is needed by both the main capability and the timer/ticker thread, so always use the mutex. This should fix #25165 which is about the main capability and the timer thread posting events to the eventlog buffer concurrently and thereby corrupting the buffer data. - - - - - 0ff29782 by Duncan Coutts at 2026-06-12T04:54:06-04:00 Expose eventBufMutex in the EventLog interface/header We will need it in forkProcess to ensure we don't write to the global eventlog buffer concurrently with trying to flush eventlog buffers and do the fork(). - - - - - 7a688395 by Duncan Coutts at 2026-06-12T04:54:07-04:00 Split flushAllCapsEventsBufs into safe and unlocked version Following the convention that unlocked versions have a trailing _ underscore in their name. This one requires the caller to hold the eventlog global buffer mutex. We will need this in forkProcess. - - - - - 341ed474 by Duncan Coutts at 2026-06-12T04:54:07-04:00 Remove redundant use of stopTimer in setNumCapabilities Historically, the comment here was: We must stop the interval timer while we are changing the capabilities array lest handle_tick may try to context switch an old capability. See #17289. and We must disable the timer while we do this since the tick handler may call contextSwitchAllCapabilities, which may see the capabilities array as we free it. What this refers to is that historically, when changing the number of capabilities, the array of capabilities was reallocated to a new size, allocating new ones and freeing the old ones, thus invalidating all existing capbility pointers. Strangely, for good measure the code used to call stopTimer twice (hence the two similar comments above). However, since commit a3eccf06292dd666b24606251a52da2b466a9612, the capabilities array is no longer reallocated. Instead the array is allcoated once on RTS startup to the maximum size it could ever be allowed to be, and then capabilities get enabled/disabled at runtime. So the capability pointers never become invalid anymore. At worst, they may point to capabilities that are disabled. Thus we no longer need to stop the timer (twice) while we change the number of enabled capabilities. This also partially solves issue #27105, which notes that stopTimer is being used as if it were synchronous, when it is not. At least for this case, the solution is that stopTimer is not needed at all! - - - - - 674858e3 by Duncan Coutts at 2026-06-12T04:54:07-04:00 Remove redundant use of stopTimer in forkProcess but replace it with taking the eventlog buffer lock during the fork. Fixes issue #27105 The original reason to block the timer during a fork was that historically the timer was implemented using a periodic timer signal, and the signal itself would interrupt the fork system call (returning EINTR). For large processes (where fork() takes a while) this could permanently livelock: the timer always would go off before the fork could complete, which got retried in a loop forever. The timer is no longer implemented as a unix signal, but uses threads. Thus the original problem no longer exists. The only remaining reason to block the timer tick is to prevent actions taken by the tick from interfering with the delicate process involved in fork (taking a load of locks and pausing everything). The only thing we need to do is to prevent the eventlog from being written to or flushed while the fork is taking place. To achieve this all we need to do is hold the mutex for the global eventlog buffer. This removes the last use of stopTimer that expects stopTimer to work synchronously (which it was not) and thus solves issue #27105. To be clear, we solve issue #27105 not by making stopTimer synchronous, but by eliminating the use sites that expected it to be synchronous. - - - - - 40764930 by sheaf at 2026-06-12T14:54:43-04:00 Add type family performance test for #26426 Some GHC versions produced large numbers of coercions after typechecking and desugaring when compiling the program in #26426: Version | Typechecker time | Typechecker allocations | Coercions -------:|-----------------:|------------------------:|---------: 9.6 | 47 ms | 48 MB | 110k 9.8 | 1000 ms | 486 MB | 10,437k 9.10 | 922 ms | 489 MB | 10,436k 9.12 | 906 ms | 482 MB | 10,437k 9.14 | 63 ms | 55 MB | 333k 10.0 | 47 ms | 64 MB | 35k The improvement 9.12 -> 9.14 was due to commit 22d11fa818fae2c95c494fc0fac1f8cb4c6e7cb6, while the improvement 9.14 -> 10.0 was due to commit 0b7df6db9e46df40e86fbff1a66dc10440b99db5. As the behaviour of GHC seems better than it's ever been on this program, we declare victory, adding this performance test to ensure we don't regress on this program. On the way, we update Note [Combining equalities] in GHC.Tc.SolveR.Equality with the explanation of the 9.12 -> 9.14 improvement (getting rid of an exponential blowup in coercion sizes), and we update Note [Exploiting closed type families] in GHC.Tc.Solver.FunDeps with the explanation of the 9.14 -> 10.0 improvement (bringing down coercion size growth from cubic to quadratic). - - - - - 0f3d0a71 by Zubin Duggal at 2026-06-12T14:55:30-04:00 compiler: mark tool messages as errors/warnings depending on the exit code Fixes #27370 - - - - - d9ea2d76 by mangoiv at 2026-06-13T04:41:51-04:00 libraries/process: bump submodule to v1.6.30.0 - bump the submodule to the appropriate tag - suppress benign warning resulting from the change - - - - - 6ebaaba3 by David Eichmann at 2026-06-13T04:42:37-04:00 ghc-toolchain: don't throw when candidate executables are not found Fixes #27369 - - - - - 6c65e1e1 by David Eichmann at 2026-06-13T04:43:23-04:00 CI: lint-changelog checks for no-changelog label in script instead of rules - - - - - bab37cc6 by konsumlamm at 2026-06-13T19:10:21+02:00 Implement CLC proposal #378 Add `Data.Double` and `Data.Float` modules Document that GHC uses IEEE 754 - - - - - fb5246ad by fendor at 2026-06-15T18:07:23-04:00 Drop `preloadClosure` from `UnitState` It is always hard-coded to the same value. Backpack Unit instantiation isn't using it any more. Allows us to simplify the API and get rid of `improveUnit`. - - - - - 291ce3aa by ARATA Mizuki at 2026-06-15T18:08:26-04:00 RISC-V NCG: Zero-extend the result of castFloatToWord32 According to the ISA manual, FMV.X.W sign-extends the result. We need to truncate the result to avoid creating an exotic Word32 value. Fixes #27300 - - - - - 011be91f by ARATA Mizuki at 2026-06-15T18:08:26-04:00 RISC-V NCG: Treat d28-d31 (ft8-ft11) as caller-saved According to the calling convention, the registers d28-d31 (ft8-ft11) are caller-saved. Fixes #27306 - - - - - e8a54713 by ARATA Mizuki at 2026-06-15T18:08:26-04:00 RISC-V NCG: Set rounding mode when emitting `truncate` If we omit the rounding mode for `fcvt`, `dyn` will be used. We do not want that for `truncate`, so we set `rtz`. In other places, we set `rne` because we do not use the dynamic rounding mode. Fixes #27303 - - - - - 9438bec7 by Zubin Duggal at 2026-06-15T18:09:11-04:00 rts: fix validate build with gcc 16. `__attribute__((regparm(1)))` is ignored on x86_64 and now gcc warns that it is ignored: rts/sm/Evac.h:35:1: error: error: ‘regparm’ attribute ignored [-Werror=attributes] See https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ccead81bbc39668376eb5cf47066a… Fixes #27366 - - - - - 893e6133 by Andrew Lelechenko at 2026-06-15T23:55:36+01:00 base: more NonEmpty zips CLC proposal: https://github.com/haskell/core-libraries-committee/issues/409 - - - - - 1314f2fd by David Eichmann at 2026-06-16T05:46:52-04:00 Hadrian: fix ghc-internal .def file name - - - - - 7f72bcb3 by mangoiv at 2026-06-16T05:47:39-04:00 compiler: ignore camelCase and Eta reduce hlint hints These do not cohere with the style used in GHC. After disabling them, hlint lints are much less noisy again. - - - - - 842bef9f by Alan Zimmerman at 2026-06-16T05:48:25-04:00 EPA: Use standard type family declaration for Anno - - - - - f6d30767 by Wolfgang Jeltsch at 2026-06-16T15:32:34-04:00 Fix two issues in the documentation of pipeline interruption One issue is a typo (“interreuptible”), the other one the lack of an end of a sentence, which has been reconstructed from the message of 633bbc1fd4762a2bb73ba1c5b9e0c279f1dd3c40, the commit that introduced said documentation. - - - - - a3fa10e0 by Christian Georgii at 2026-06-16T15:33:26-04:00 Find plugins in sibling home units in multiple-home-unit sessions In a multiple-home-unit session (e.g. `cabal repl --enable-multi-repl` or HLS), enabling a plugin with -fplugin that is defined in (or reexported by) another home unit failed with a "hidden package" error. The plugin module finder only searched the current home unit and the registered external packages, never the sibling home units. findPluginModuleNoHsc now searches the home units that the current home unit depends on, following module reexports and respecting hidden modules, exactly as ordinary import resolution does in findImportedModuleNoHsc. To avoid two divergent copies of this logic, the shared home-unit search (the current home unit first, then its dependencies in priority order, with the accompanying ordering invariant) is extracted into findHomeModuleAmongDeps, which both findImportedModuleNoHsc and findPluginModuleNoHsc now call. Add testsuite/tests/driver/multipleHomeUnits/plugin01, which loads a plugin as byte-code from a sibling home unit, and plugin02, in which the consumer enables a plugin reexported by a sibling home unit without depending on the plugin's own home unit directly. Fixes #27349 - - - - - d216412b by Ian-Woo Kim at 2026-06-16T20:25:57-04:00 Make the order of usages deterministic It has been observed that the ordering of usages can be non-determinstic in parallel builds. Therefore, this contribution introduces sorting of usages based on a platform- and race-independent sorting criterion. Resolves #26877. Co-authored-by: Wolfgang Jeltsch <wolfgang(a)well-typed.com> - - - - - 8e1cc105 by Wolfgang Jeltsch at 2026-06-16T20:25:57-04:00 Change the descriptions of two existing changelog entries The descriptions now describe the changes in a user-friendly manner, as opposed to describing the contributions that led to these changes in a developer-friendly manner. - - - - - 636c1c7a by Ian Duncan at 2026-06-16T20:26:50-04:00 AArch64: use SXTH, not SXTW, for W32 signExtendReg signExtendReg was using SXTH (sign-extend halfword, 16-bit) for W32-to-W64 sign extension. This should be SXTW (sign-extend word, 32-bit). SXTH only sign-extends the lower 16 bits, producing wrong results for 32-bit values whose bit 15 differs from bit 31. Other fixes: - At sub-W64, code gen for MO_S_Mul2 should use W32 registers for SMULL source operands as per the ARM spec (SMULL Xd, Wn, Wm), and not W64. - Ensure signExtendReg uses the source width for the source operand in SXTW/SXTH/SXTB instructions. GNU as requires sxtw Xd,Wn (not sxtw Xd,Xn), while LLVM's integrated assembler on macOS is lenient. - Fix overflow flag computation for `MO_S_Mul2`. The overflow bit was exactly inverted for sub-W64 operands. Fixes #26978 and #27047 - - - - - b734c75d by Igor Ranieri at 2026-06-16T20:27:32-04:00 haddock: Update CONTRIBUTING with missing step, add missing test dependency - - - - - 7fe4f2ec by Luite Stegeman at 2026-06-17T05:35:09-04:00 tag inference: don't confuse functions with their return values inferTagRhs was mixing up taggedness for closures and return values for function closures. We really shouldn't assign TagTuple to a properly tagged function returning a tuple. We fix this by keeping track of functions (TagFun) separately from values (TagVal) and keeping track of their return value. TagFun is also used for join points. fixes #27005 - - - - - 4671c126 by Sebastian Graf at 2026-06-17T05:35:55-04:00 Seed the simplifier's in-scope set for open expressions simplifyExpr simplifies expressions typed at the GHCi prompt and the results of Template Haskell splices. Such an expression may be open: at a GHCi debugger breakpoint its free variables include RuntimeUnk skolems standing for as-yet-unknown types. The simplifier began with an in-scope set holding only the wildcard binder, so when it instantiated the unsafeCoerce# wrapper that GHCi builds around a result, it formed a substitution whose range mentioned a free skolem that was not in scope. That breaks the substitution invariant and, in a compiler built with assertions, trips substTy's sanity check. Seed the initial in-scope set with the free variables of the expression. For a closed expression this adds nothing. See Note [Seed the in-scope set for open expressions]. Fixes #17833 and its duplicate #21118. - - - - - 67d41299 by Sebastian Graf at 2026-06-18T05:18:24-04:00 Desugar a `case` scrutinee only once (#27383, #20251) In `dsExpr` for `HsCase` we desugared the scrutinee /twice/: once to build the Core `case` itself, and again inside `matchWrapper`, which re-desugared the source scrutinee (via `addHsScrutTmCs`) purely to record long-distance information for the pattern-match checker. For a single `case` that is merely wasteful. But for nested cases it is catastrophic. Consider case (case (case e of ... ) of ... ) of ... Desugaring the outer scrutinee desugars the middle `case` twice, each of which desugars the inner `case` twice, and so on. The work doubles at every level, so desugaring takes O(2^n) time in the nesting depth. That is the blowup reported in #27383; it is also what makes the machine-generated program in #20251 take an age to compile. The fix is simple. `matchWrapper` is handed the scrutinee anyway, so we give it the Core expression we have /already/ desugared, and record the long-distance term constraint with `addCoreScrutTmCs` instead of re-desugaring from source. This is just what `matchSinglePatVar` already does for single-pattern matches. So: * `matchWrapper` now takes `Maybe [CoreExpr]` rather than `Maybe [LHsExpr GhcTc]`. * The `HsCase` equation of `dsExpr` passes the already-desugared `core_discrim`; the arrow desugarer passes its match variables. * `addHsScrutTmCs` had no other use, so it is gone. Desugaring is now linear in the nesting depth. (The coverage checker still runs `simpleOptExpr` over each scrutinee, which leaves the total at O(n^2); that is ample.) The long-distance information itself is unchanged: the checker sees precisely the Core that backs the generated code. Test: deSugar/should_compile/T27383 - - - - - fa5defde by Rodrigo Mesquita at 2026-06-18T05:19:11-04:00 fix: Save FastStrings in the PMC There is no point in adding the unique to the occurrence FastString we create, since it is part of the Id anyway. Adding it to the FastString, meant each FastString was unique unnecessarily! In a separate branch, running the compiler on test `InstanceMatching` observed 30000 `FastString`s created by this code path. Plus, `fsLit "pm"` follows the existing pattern in `mkPmId`. - - - - - 4efb4a66 by Alan Zimmerman at 2026-06-18T14:41:14-04:00 TTG: Add extension points to HsConDetails Extend HsConDetails as data HsConDetails p arg rec = PrefixCon !(XPrefixCon p) [arg] -- C @t1 @t2 p1 p2 p3 | RecCon !(XRecCon p) rec -- C { x = p1, y = p2 } | InfixCon !(XInfixCon p) arg arg -- p1 `C` p2 | XHsConDetails !(XXHsConDetails p) type family XPrefixCon p type family XRecCon p type family XInfixCon p type family XXHsConDetails p - - - - - c8d27dd4 by Simon Jakobi at 2026-06-18T14:41:59-04:00 CI: quiet submodule clean output in after_script and setup The clean and cleanup_submodules functions ran 'git submodule foreach git clean -xdf', flooding the job log with 'Entering ...' and 'Removing ...' lines. Pass --quiet to 'git submodule' and -q to 'git clean' to drop the success output; errors are still reported. Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com> - - - - - 09326ca6 by Matthew Pickering at 2026-06-20T23:41:12+02:00 Add missing req_interp modifier to T18441fail3 and T18441fail19 These tests require the interpreter but they were failing in a different way with the javascript backend because the interpreter was disabled and stderr is ignored by the test. - - - - - 521e55bf by Matthew Pickering at 2026-06-20T23:41:13+02:00 hadrian: Fill in more of the default.host toolchain file When you are building a cross compiler this file will be used to build stage1 and it's libraries, so we need enough information here to work accurately. There is still more work to be done (see for example, word size is still fixed). - - - - - 23c9b6c3 by Matthew Pickering at 2026-06-20T23:42:52+02:00 hadrian: Build stage 2 cross compilers * Most of hadrian is abstracted over the stage in order to remove the assumption that the target of all stages is the same platform. This allows the RTS to be built for two different targets for example. * Abstracts the bindist creation logic to allow building either normal or cross bindists. Normal bindists use stage 1 libraries and a stage 2 compiler. Cross bindists use stage 2 libararies and a stage 2 compiler. * hadrian: Make binary-dist-dir the default build target. This allows us to have the logic in one place about which libraries/stages to build with cross compilers. Fixes #24192 New hadrian target: * `binary-dist-dir-cross`: Build a cross compiler bindist (compiler = stage 1, libraries = stage 2) This commit also contains various changes to make stage2 compilers feasible. ------------------------- Metric Decrease: LinkableUsage02 ManyAlternatives ManyConstructors MultiComponentModulesRecomp MultiLayerModulesRecomp RecordUpdPerf T10421 T12150 T12227 T12425 T12707 T13035 T13379 T13820 T15703 T16577 T18140 T18282 T18698a T18698b T18923 T1969 T20049 T21839c T3294 T4801 T5030 T5321FD T5321Fun T5631 T5642 T6048 T783 T9020 T9198 T9233 T9630 T9872d T9961 parsing001 T3064 Metric Increase: T26989 hard_hole_fits ------------------------- Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com> - - - - - 26fed8ab by Matthew Pickering at 2026-06-20T23:42:52+02:00 ci: Test cross bindists We remove the special logic for testing in-tree cross compilers and instead test cross compiler bindists, like we do for all other platforms. - - - - - 80c8910e by Matthew Pickering at 2026-06-20T23:42:52+02:00 ci: Introduce CROSS_STAGE variable In preparation for building and testing stage3 bindists we introduce the CROSS_STAGE variable which is used by a CI job to determine what kind of bindist the CI job should produce. At the moment we are only using CROSS_STAGE=2 but in the future we will have some jobs which set CROSS_STAGE=3 to produce native bindists for a target, but produced by a cross compiler, which can be tested on by another CI job on the native platform. CROSS_STAGE=2: Build a normal cross compiler bindist CROSS_STAGE=3: Build a stage 3 bindist, one which is a native compiler and library for the target - - - - - 8215573d by Sven Tennie at 2026-06-20T23:42:52+02:00 ci: Increase timeout for emulators Test runs with emulators naturally take longer than on native machines. Generate jobs.yml - - - - - 5acb7dbc by Matthew Pickering at 2026-06-20T23:42:52+02:00 ci: Javascript don't set CROSS_EMULATOR There is no CROSS_EMULATOR needed to run javascript binaries, so we don't set the CROSS_EMULATOR to some dummy value. - - - - - 48345343 by Sven Tennie at 2026-06-20T23:42:52+02:00 Javascript skip T23697 See #22355 about how HSC2HS and the Javascript target don't play well together. - - - - - 5e44fd05 by Sven Tennie at 2026-06-20T23:42:52+02:00 Mark T24602 as fragile It was skipped before (due to CROSS_EMULATOR being set, which changed for JS), so we don't make things worse by marking it as fragile. - - - - - ab349ec2 by Sven Tennie at 2026-06-20T23:42:52+02:00 Fix T22744 for GHCJS In fact, this test needs Template Haskell, not necessarily an interpreter. - - - - - c73352d8 by Sven Tennie at 2026-06-20T23:42:52+02:00 haddock-test: fix GHCJS haddock test failures Add --ghc-pkg-path flag support so haddock test runner can find cross-prefixed ghc-pkg (e.g. javascript-unknown-ghcjs-ghc-pkg) which is not on $PATH in cross install directories. Skip haddockHtmlTest on GHCJS: Threaded.hs uses forkOS in a TH splice, which GHCJS RTS doesn't support. Mark with js_skip in all.T. - - - - - 5e814e76 by Andreas Klebinger at 2026-06-22T23:00:24-04:00 compiler: Deduplicate hscTidy This function was accidentally duplicated during a refactor. Fixes #27351 - - - - - 473b97eb by sheaf at 2026-06-22T23:01:22-04:00 Avoid mkTick in Core Prep breaking ANF (part II) Hotfix for 2f9579765f55b3920ceb2e04995ff41a9d0e2d4e fixing a small oversight in the call to tickTickedExpr from mkTick, in which we improperly recursively called mkTick without passing on the preserve_anf flag. Fixes #27386 - - - - - 9284a1f7 by Simon Hengel at 2026-06-23T05:55:33-04:00 Don't use global variables to address concurrency bugs! (fixes #27234) This was originally introduce with 88f38b03025386f0f1e8f5861eed67d80495168a to address #17922. In this specific case a better fix would have been to synchronize on stderr: withHandle_ "stderrSupportsAnsiColors" stderr $ \ _ -> do ... But apparently the dependency on `terminfo` was removed in 32ab07bf3d6ce45e8ea5b55e8095174a6b42a7f0, preventing #17922 in the first place. - - - - - 44309cd3 by Alan Zimmerman at 2026-06-23T05:56:20-04:00 EPA: remove LocatedL / SrcSpanAnnL and LocatedLI / SrcSpanAnnLI This is part of a refactor towards only having LocatedA / SrcSpanAnnA It removes the stated items, but has to add back one for BooleanFormula, LocatedBF / SrcSpanAnnBF This commit also use the HsConDetails RecCon extension point to capture the braces in a record constructor - - - - - 2f6a5534 by Simon Jakobi at 2026-06-23T15:46:20+02:00 Add -dstable-core-dump-order for stable Core dump ordering (#27296) The order of top-level bindings in Core dumps (-ddump-simpl etc.) is the compiler's Unique-sensitive internal processing order, so an unrelated upstream change can reorder them and defeat a textual diff of two dumps. This adds an opt-in flag -dstable-core-dump-order that reorders the top-level bindings of dumps routed through dumpPassResult into a stable, Unique-independent order, so two dumps line up across rebuilds. See Note [Stable Core dump order] in GHC.Core.Ppr for the sort key and its rationale. Adds tests T27296 (binders GHC emits in non-source order by default, asserted to come out stably ordered under the flag) and T27296b (an untidied -ddump-float-out dump pinning the ordering of the anonymous lvl floats by literal value). Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com> - - - - - 141986e3 by mangoiv at 2026-06-24T15:51:14-04:00 compiler: refactor error reporting code for ExplicitLevelImports Refactors error reporting code for ExplicitLevelImports to pass in a RdrName and a GlobalReaderElt to be able to report errors that are faithful to the source and to more precisely distinguish between names that are in scope from different qualifications. Fixes #27385 and #26616 - - - - - aa7df6b6 by Simon Hengel at 2026-06-24T15:52:18-04:00 Set GHC_VERSION when calling custom pre-processors (see #25952) (so that pre-processors can emit backwards compatible code) - - - - - a9e494f2 by Simon Hengel at 2026-06-24T15:54:08-04:00 Add a flag to control GHCi specific error hints (close #27409) - - - - - a805b2a2 by Simon Hengel at 2026-06-24T15:55:20-04:00 Reference correct package in error messages for reexported modules (fixes #27417) - - - - - f235d183 by Simon Jakobi at 2026-06-25T05:51:18-04:00 Add explicit setBit/clearBit/complementBit for instance Bits Integer (#21176) The default setBit, clearBit, and complementBit methods allocate intermediate Integers per call. Define them explicitly via the new integerSetBit[#], integerClearBit[#] and integerComplementBit[#], built on the BigNat# primitives, which avoid those allocations. Allocation is not eliminated entirely -- the negative (IN) cases would need in-place mutation, which is left as future work. The default methods constant-folded on literal arguments via the integerOr/integerAnd/integerXor rules, which fold literal Integers of any size. The explicit functions have no such rule, so they (their Word-argument wrappers, and the Bits Integer methods) are marked INLINE to expose the underlying primops to the simplifier; see Note [INLINE for constant folding of bit operations]. This restores folding only on the small-int (IS) path -- large literal Integers (IP/IN) are no longer constant-folded, a minor regression for that case. T8832 covers the IS-path folding. The new golden-output test T21176 checks all three operations against the default implementations across the sign/size boundaries, recording each result plus its integerCheck validity. The base and ghc-bignum interface- stability export goldens gain the new functions. The main changelog entry lives in changelog.d under a new ghc-internal section (renamed from ghc-prim). CLC proposal: https://github.com/haskell/core-libraries-committee/issues/423 Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com> - - - - - 202ed264 by Marc Scholten at 2026-06-25T05:52:21-04:00 haddock: use Text in documentation pipeline This patch moves Haddock's documentation pipeline from String to Text where the data is already textual. It avoids repeated conversions while keeping the existing decoding behavior for invalid UTF-8 docstring chunks. The main changes are: * Render and carry docstrings as Text in Haddock-facing paths. * Use the Binary Text instance from GHC.Utils.Binary for Haddock interface files, and bump the Haddock binary interface version. * Add a FastString HTML instance so XHTML rendering avoids intermediate String allocation. * Keep HsDocStringChunk decoding lenient, matching the previous unpackHDSC behavior on invalid UTF-8 input. * Update the xhtml submodule to 3000.4.1.0, which contains the apostrophe escaping fix used by the Haddock test output. Co-authored-by: copilot-swe-agent[bot] <198982749%2BCopilot(a)users.noreply.github.com> Co-authored-by: Claude Opus 4.5 <noreply(a)anthropic.com> Assisted-by: Codex <codex(a)openai.com> - - - - - a72ff58f by mangoiv at 2026-06-25T05:53:07-04:00 compiler: rename ZonkAny to UnusedType and add pretty printing logic ZonkAny is a hard to understand name for users who do not know how the compiler works internally. Additionally, it is confusing that ZonkAny, while being a concrete type *represents* a meta variable, espeically in the compiler output. This patch changes the name of ZonkAny to UnusedType which is closer to its intended semantics and adds special pretty printing logic to display this type in the same fashion the compiler displays meta variables in other places, whenever they leak from the implementation to the user. It also exports the type from ghc-internal:GHC.Internal.Types in order to expose documentation. Fixes #27390 Co-Authored-By: Sam Derbyshire <sam.derbyshire(a)gmail.com> - - - - - 6813f002 by Simon Jakobi at 2026-06-26T04:51:47-04:00 Reg.Linear: drop Platform argument from most FR (FreeRegs) methods The FR class has one instance per CPU architecture, so any architecture-constant information its methods derived from the Platform argument can instead be baked into the instance. This removes the now needless Platform argument from frAllocateReg, frGetFreeRegs and frReleaseReg. frInitFreeRegs keeps its Platform argument: the initial allocatable set is genuinely platform-dependent, see Note [Aarch64 Register x18 at Darwin and Windows]. Fixes #26665 Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com> - - - - - 3b2a9409 by Zubin Duggal at 2026-06-26T04:52:39-04:00 testsuite: Report fragile failures as skipped in JUnit output - - - - - c267e098 by Simon Jakobi at 2026-06-26T11:36:00+02:00 Add -dcanonicalize-local-binds (#27176) This new debug flag renames local (internal-Name) binders in Core dumps to deterministic canonical names, so that -ddump-simpl-based golden tests no longer fail on binder-name churn and Core output can be diffed across compiler versions. Canonical names are <prefix><letters> with bijective base-26 letter sequences (A..Z, AA, ...) and one independent counter per binder role: * cj: join points * cw: case binders * ct: type and coercion variables * cb: all other term binders All counters restart for each top-level binding, and names are allocated visible-first (RHS before unfolding templates and rules), so churn in one part of the output cannot renumber binders in an unrelated, unchanged part. This kind-aware scheme refines the single-sequence clbA scheme proposed in the ticket. The renaming is applied only inside the dump document, in GHC.Core.Lint.dumpPassResult (plus the simplifier's per-iteration dump), the chokepoint through which all Core pass dumps go; the program that is linted and compiled is unaffected, as are interface files and generated code. Renamed binders keep their Uniques, so the flag composes with and without -dsuppress-uniques. Co-Authored-By: Claude Fable 5 <noreply(a)anthropic.com> - - - - - 75266578 by Simon Jakobi at 2026-06-26T13:32:34+02:00 T18013: stabilise Core dump with -dcanonicalize-local-binds (#27176) T18013 is a full -ddump-simpl golden test that has been re-accepted ~8 times only because unrelated compiler changes churned its nested local binder names (case binders, worker args, type variables). Add -dcanonicalize-local-binds and -dstable-core-dump-order to its dump pragma so the golden no longer tracks unique-driven binder naming or top-level ordering, and regenerate the expected output. - - - - - 0384a355 by Simon Jakobi at 2026-06-28T18:23:31+02:00 Canonicalize: number unfoldings and rules as fresh scopes (#27176) Under -dcanonicalize-local-binds, an unfolding template and each attached rule were numbered in the same counter state as the enclosing binding's RHS, so a change in the visible RHS renumbered their binders and an unfolding's binders didn't line up with the RHS it came from. Attached rules were also numbered differently from the same rule printed standalone by canonicalizeRulesForDump. Run each unfolding and each rule in its own fresh counter scope (new withFreshCounters combinator in canonIdInfo): their binders are independent of the surrounding code, so RHS churn can no longer renumber them and an unfolding now reads as a mirror of its RHS. canonicalizeRulesForDump uses the same combinator, so attached and standalone rules match. See Note [Canonicalizing local binders for dumps] in GHC.Core.Canonicalize. Assisted-by: Claude Opus 4.8 - - - - - d24f62ec by Simon Jakobi at 2026-06-28T18:45:29+02:00 testsuite: cover canonicalization of attached RULES (#27176) T27176c exercises -dcanonicalize-local-binds on a specialisation rule attached to a binder's IdInfo, which the existing flag tests (T27176, T27176b, T18013) don't reach. An overloaded `spec` with a SPECIALISE pragma carries a "USPEC" rule whose forall-bound dictionary binder has an internal name; canonicalization renames it in its own fresh scope. `spec`'s RHS already allocates cbA..cbC, so the rule binder reads cbA only under the fresh-scope numbering of canonIdInfo; the shared scheme would render it cbD, so the golden guards that behavior. Dump CSE (pre-Tidy) rather than -ddump-simpl, since Tidy detaches local rules from IdInfo into a separate section; cf. T7785. Assisted-by: Claude Opus 4.8 - - - - - 459 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - + changelog.d/26616 - + changelog.d/T17833 - + changelog.d/T21176 - + changelog.d/T26978 - + changelog.d/T27046 - + changelog.d/T27047 - + changelog.d/T27308 - + changelog.d/T27386 - + changelog.d/canonicalize-local-binds-27176 - changelog.d/config - + changelog.d/deterministic-usage-order - + changelog.d/fix-exponential-case-desugar-27383 - + changelog.d/fix-plugin-finder-multi-home-unit.md - + changelog.d/hadrian-stale-package-confs-26661 - + changelog.d/interactive-error-hints - changelog.d/module-graph-reuse-in-downsweep - changelog.d/more-efficient-home-unit-imports-finding - + changelog.d/pp-set-ghc-version - + changelog.d/reexported-module-errors - + changelog.d/stable-core-dump-order-27296 - + changelog.d/stage2-cross-compilers - + changelog.d/tag-inference-27005 - + changelog.d/tool-messages-27370 - + changelog.d/unused-type - compiler/.hlint.yaml - 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utils/haddock/html-test/ref/TypeFamilies3.html The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/aa4e18814a9f013b38713c4dffe940… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/aa4e18814a9f013b38713c4dffe940… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] EPA: Remove LocatedC / SrcSpanAnnC
by Marge Bot (＠marge-bot) 29 Jun '26

29 Jun '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: 3d301d97 by Alan Zimmerman at 2026-06-28T12:07:53-04:00 EPA: Remove LocatedC / SrcSpanAnnC This is part of a cleanup of the zoo of SrcSpanAnnXXX types for exact print annotations. This one removes SrcSpanAnnC used for storing exact print annotations for contexts. It replaces it with an explicit `HsContext` data type that carries the annotations and the context. So, replace type HsContext pass = [LHsType pass] with type HsContext pass = HsContextDetails pass (LHsType pass) data HsContextDetails pass arg = HsContext { hsc_ext :: !(XHsContext pass) , hsc_ctxt :: [arg] } | XHsContextDetails !(XXHsContextDetails pass) We need the parameterised HsContextDetails because it is used both for HsQual carrying 'LHsExpr p' and "normal" contexts carrying 'LHsType p'. - - - - - 36 changed files: - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Dump.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/ThToHs.hs - compiler/Language/Haskell/Syntax/Expr.hs - compiler/Language/Haskell/Syntax/Type.hs - testsuite/tests/ghc-api/T25121_status.stdout - testsuite/tests/parser/should_compile/DumpSemis.stderr - testsuite/tests/parser/should_compile/T15323.stderr - testsuite/tests/printer/Test24533.stdout - utils/check-exact/ExactPrint.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/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/Types.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/3d301d97a9bae53ff55ac5c3886d687… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/3d301d97a9bae53ff55ac5c3886d687… You're receiving this email because of your account on gitlab.haskell.org.

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