December 2025 - ghc-commits

[Git][ghc/ghc] Pushed new branch wip/grow-block-free
by Cheng Shao (＠TerrorJack) 23 Dec '25

23 Dec '25

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

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[Git][ghc/ghc][wip/T26681] 8 commits: Do deep subsumption when computing valid hole fits
by Simon Peyton Jones (＠simonpj) 23 Dec '25

23 Dec '25

Simon Peyton Jones pushed to branch wip/T26681 at Glasgow Haskell Compiler / GHC Commits: db1ce858 by sheaf at 2025-12-22T17:11:17-05:00 Do deep subsumption when computing valid hole fits This commit makes a couple of improvements to the code that computes "valid hole fits": 1. It uses deep subsumption for data constructors. This matches up the multiplicities, as per Note [Typechecking data constructors]. This fixes #26338 (test: LinearHoleFits). 2. It now suggests (non-unidirectional) pattern synonyms as valid hole fits. This fixes #26339 (test: PatSynHoleFit). 3. It uses 'stableNameCmp', to make the hole fit output deterministic. ------------------------- Metric Increase: hard_hole_fits ------------------------- - - - - - 72ee9100 by sheaf at 2025-12-22T17:11:17-05:00 Speed up hole fits with a quick pre-test This speeds up the machinery for valid hole fits by doing a small check to rule out obviously wrong hole fits, such as: 1. A hole fit identifier whose type has a different TyCon at the head, after looking through foralls and (=>) arrows, e.g.: hole_ty = Int cand_ty = Maybe a or hole_ty = forall a b. a -> b cand_ty = forall x y. Either x y 2. A hole fit identifier that is not polymorphic when the hole type is polymorphic, e.g. hole_ty = forall a. a -> a cand_ty = Int -> Int ------------------------- Metric Decrease: hard_hole_fits ------------------------- - - - - - 30e513ba by Cheng Shao at 2025-12-22T17:12:00-05:00 configure: remove unused win32-tarballs.md5sum This patch removes the unused `win32-tarballs.md5sum` file from the tree. The current mingw tarball download logic in `mk/get-win32-tarballs.py` fetches and checks against `SHA256SUM` from the same location where the tarballs are fetched, and this file has been unused for a few years. - - - - - a2d52b3b by Wolfgang Jeltsch at 2025-12-23T04:47:33-05:00 Add an operation `System.IO.hGetNewlineMode` This commit also contains some small code and documentation changes for related operations, for the sake of consistency. - - - - - b26d134a by Cheng Shao at 2025-12-23T04:48:15-05:00 rts: opportunistically reclaim slop space in shrinkMutableByteArray# Previously, `shrinkMutableByteArray#` shrinks a `MutableByteArray#` in-place by assigning the new size to it, and zeroing the extra slop space. That slop space is not reclaimed and wasted. But it's often the case that we allocate a `MutableByteArray#` upfront, then shrink it shortly after, so the `MutableByteArray#` closure sits right at the end of a nursery block; this patch identifies such chances, and also shrink `bd->free` if possible, reducing heap space fragmentation. Co-authored-by: Codex <codex(a)openai.com> ------------------------- Metric Decrease: T10678 ------------------------- - - - - - c013db53 by Simon Peyton Jones at 2025-12-23T16:43:05+00:00 Add missing InVar->OutVar lookup in SetLevels As #26681 showed, the SetLevels pass was failing to map an InVar to an OutVar. Very silly! I'm amazed it hasn't broken before now. I have improved the type singatures (to mention InVar and OutVar) so it's more obvious what needs to happen. - - - - - 37d1d895 by Simon Peyton Jones at 2025-12-23T16:43:05+00:00 Wibbles to perf - - - - - 55e131c1 by Simon Peyton Jones at 2025-12-23T16:43:05+00:00 Wibble - - - - - 44 changed files: - .gitattributes - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Tc/Errors/Hole.hs - compiler/GHC/Tc/Errors/Hole/FitTypes.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Utils/Unify.hs - docs/users_guide/9.16.1-notes.rst - libraries/base/changelog.md - libraries/base/src/System/IO.hs - libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs - libraries/ghc-internal/src/GHC/Internal/System/IO.hs - − mk/win32-tarballs.md5sum - rts/PrimOps.cmm - testsuite/tests/ghci/scripts/T8353.stderr - testsuite/tests/interface-stability/base-exports.stdout - testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs - testsuite/tests/interface-stability/base-exports.stdout-mingw32 - testsuite/tests/interface-stability/base-exports.stdout-ws-32 - testsuite/tests/overloadedrecflds/should_fail/DRFHoleFits.stderr - testsuite/tests/perf/compiler/hard_hole_fits.stderr - testsuite/tests/plugins/test-hole-plugin.stderr - + testsuite/tests/simplCore/should_compile/T26681.hs - testsuite/tests/simplCore/should_compile/all.T - testsuite/tests/th/T15321.stderr - testsuite/tests/typecheck/should_compile/T13050.stderr - testsuite/tests/typecheck/should_compile/T14273.stderr - testsuite/tests/typecheck/should_compile/T14590.stderr - testsuite/tests/typecheck/should_compile/T25180.stderr - testsuite/tests/typecheck/should_compile/abstract_refinement_hole_fits.stderr - testsuite/tests/typecheck/should_compile/constraint_hole_fits.stderr - testsuite/tests/typecheck/should_compile/free_monad_hole_fits.stderr - testsuite/tests/typecheck/should_compile/hole_constraints.stderr - testsuite/tests/typecheck/should_compile/holes.stderr - testsuite/tests/typecheck/should_compile/holes2.stderr - testsuite/tests/typecheck/should_compile/holes3.stderr - testsuite/tests/typecheck/should_compile/refinement_hole_fits.stderr - testsuite/tests/typecheck/should_compile/subsumption_sort_hole_fits.stderr - testsuite/tests/typecheck/should_compile/type_in_type_hole_fits.stderr - testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr - testsuite/tests/typecheck/should_compile/valid_hole_fits_interactions.stderr - testsuite/tests/typecheck/should_fail/T14884.stderr - utils/deriveConstants/Main.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/cce457645c24de4d729142e07e8904… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/cce457645c24de4d729142e07e8904… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/romes/25636] 3 commits: datacon_info is not a gcptr
by Rodrigo Mesquita (＠alt-romes) 23 Dec '25

23 Dec '25

Rodrigo Mesquita pushed to branch wip/romes/25636 at Glasgow Haskell Compiler / GHC Commits: c2a238db by Rodrigo Mesquita at 2025-12-23T14:27:04+00:00 datacon_info is not a gcptr - - - - - a9860ca5 by Rodrigo Mesquita at 2025-12-23T14:49:50+00:00 Tag con obj - - - - - 87b492bc by Rodrigo Mesquita at 2025-12-23T16:24:18+00:00 Finally nail it. Just need the topo sort. - - - - - 5 changed files: - compiler/GHC/ByteCode/Asm.hs - libraries/ghci/GHCi/CreateBCO.hs - rts/PrimOps.cmm - rts/RtsSymbols.c - + testsuite/tests/codeGen/should_run/T23146/T25636.stdout Changes: ===================================== compiler/GHC/ByteCode/Asm.hs ===================================== @@ -223,7 +223,7 @@ assembleBCO platform , unlinkedStaticConDataConName = dataConName dc , unlinkedStaticConLits = nonptrs , unlinkedStaticConPtrs = ptrs - , unlinkedStaticConIsUnlifted = isUnliftedType (dataConRepType dc) + , unlinkedStaticConIsUnlifted = isUnliftedType (idType (dataConWrapId dc)) } where litBCOArg (Left l) = Just $ case literal platform l of ===================================== libraries/ghci/GHCi/CreateBCO.hs ===================================== @@ -42,21 +42,27 @@ createBCOs objs = do let (unl_objs, bcos) = partition isUnliftedObj objs - -- First, construct the array of unlifted static cons. - -- Top-level unlifted constructors are never mutual recursive, so we can do - -- this by filling the array on demand - -- (it's also not possible to define a mutually recursive unlifted - -- top-level value, see [GHC-20185]), - (unl_cons, unl_hvals) <- createUnliftedStaticCons unl_objs - - -- Second, construct the lifted BCOs and static cons which may have - -- (circular) references to one another in this group. References from this - -- group to the unlifted static cons will be resolved by looking them up in - -- the array constructed in the first pass. + -- [BCO, BCO, BCO{ INSTRS=[0, 3] }, BCO{ INSTRS=[2, 3] }] + + -- unl_arr = [newConApp {PtrArr lifted:(arr ! 0), UNLIFTED:seq (unl_arr!0) --- is that 0 has already been computed}] + -- arr = [newBCO {PtrArr (arr ! 0) UNLIFTED_KIND}, newBCO {PtrArr (arr ! 2) (arr ! 3)] + let n_bcos = length bcos - hvals <- fixIO $ \hvs -> do - let arr = listArray (0, n_bcos-1) hvs - mapM (createBCO arr unl_cons) bcos + (unl_hvals, hvals) <- fixIO $ \ ~(_, hvs) -> do + + let arr = listArray (0, n_bcos-1) hvs + + -- First, construct the array of unlifted static cons. + -- Top-level unlifted constructors are never mutual recursive, so we can do + -- this by filling the array on demand (with lazy references to lifted things) + (unl_cons, unl_hvals) <- createUnliftedStaticCons unl_objs arr + + -- Second, construct the lifted BCOs and static cons which may have + -- (circular) references to one another in this group. References from this + -- group to the unlifted static cons will be resolved by looking them up in + -- the array constructed in the first pass. + hvals <- mapM (createBCO arr unl_cons) bcos + return (unl_hvals, hvals) mapM mkRemoteRef (unl_hvals ++ hvals) @@ -109,10 +115,12 @@ data LinkedBCO -- | From a list of 'UnliftedStaticCon's, create an array of unlifted heap closures -- Invariant: All ResolvedBCOs are UnliftedStaticCons -createUnliftedStaticCons :: [ResolvedBCO] -> IO (UnlConsArr, [HValue {- references to actually unlifted values, but we "forget" that -}]) -createUnliftedStaticCons objs = do +createUnliftedStaticCons :: [ResolvedBCO] -> Array Int HValue + -> IO (UnlConsArr, [HValue {- references to actually unlifted values, but we "forget" that -}]) +createUnliftedStaticCons objs lif_arr = do -- Ensure objs are topologically sorted by their dependencies - -- Then, just fill them in in order! + -- Then, just fill them in in order! TODOOOOO + -- assert ... TOPO Sort let !(I# arr_size#) = length objs !(EmptyArr emp_arr#) = emptyArr ucarr@(UnlConsArr unl_arr#) <- IO $ \s -> @@ -123,8 +131,9 @@ createUnliftedStaticCons objs = do | resolvedStaticConIsUnlifted -> do -- Because we topologically sort the objs, it's safe to assume all - -- references will already be filled in. - lbc <- linkBCO' (error "there should be no lifted dependencies for unlifted objs") ucarr obj + -- references we care about here will already be filled in. + -- todo: assert all references are lower than current ix. + lbc <- linkBCO' lif_arr ucarr obj case lbc of LinkedUnliftedStaticCon linked_static_con -> do IO $ \s -> ===================================== rts/PrimOps.cmm ===================================== @@ -2181,7 +2181,8 @@ for: return (bco); } -stg_newConAppObjzh ( P_ datacon_info, P_ literals, P_ ptrs , W_ arity ) +// Ptr InfoTable, [Literals] [Ptrs] ==> CONSTR heap closure +stg_newConAppObjzh ( W_ datacon_info, P_ literals, P_ ptrs , W_ arity ) { W_ con_obj, bytes; @@ -2218,6 +2219,8 @@ loop2: // ccall debugBelch("Exit New Con App Obj %p\n",arity); + // W_ tagged_con_obj; + // (tagged_con_obj) = ccall tagConstr(con_obj); return (con_obj); } ===================================== rts/RtsSymbols.c ===================================== @@ -656,7 +656,7 @@ extern char **environ; SymI_HasDataProto(stg_isMutableByteArrayWeaklyPinnedzh) \ SymI_HasDataProto(stg_shrinkMutableByteArrayzh) \ SymI_HasDataProto(stg_resizzeMutableByteArrayzh) \ - SymI_HasDataProto(stg_shrinkSmallMutableArrayzh) \ + SymI_HasDataProto(stg_shrinkSmallMutableArrayzh) \ SymI_HasProto(newSpark) \ SymI_HasProto(updateRemembSetPushThunk) \ SymI_HasProto(updateRemembSetPushThunk_) \ ===================================== testsuite/tests/codeGen/should_run/T23146/T25636.stdout ===================================== @@ -0,0 +1 @@ +True View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/94b4fed57d01fea75428b7ada80b6a… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/94b4fed57d01fea75428b7ada80b6a… 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] 4 commits: Add an operation `System.IO.hGetNewlineMode`
by Marge Bot (＠marge-bot) 23 Dec '25

23 Dec '25

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: a2d52b3b by Wolfgang Jeltsch at 2025-12-23T04:47:33-05:00 Add an operation `System.IO.hGetNewlineMode` This commit also contains some small code and documentation changes for related operations, for the sake of consistency. - - - - - b26d134a by Cheng Shao at 2025-12-23T04:48:15-05:00 rts: opportunistically reclaim slop space in shrinkMutableByteArray# Previously, `shrinkMutableByteArray#` shrinks a `MutableByteArray#` in-place by assigning the new size to it, and zeroing the extra slop space. That slop space is not reclaimed and wasted. But it's often the case that we allocate a `MutableByteArray#` upfront, then shrink it shortly after, so the `MutableByteArray#` closure sits right at the end of a nursery block; this patch identifies such chances, and also shrink `bd->free` if possible, reducing heap space fragmentation. Co-authored-by: Codex <codex(a)openai.com> ------------------------- Metric Decrease: T10678 ------------------------- - - - - - fa7e3ff0 by Cheng Shao at 2025-12-23T11:13:02-05:00 hadrian: fix bootstrapping with ghc-9.14 This patch fixes bootstrapping GHC with ghc-9.14, tested locally with ghc-9.14.1 release as bootstrapping GHC. - - - - - a648f491 by Cheng Shao at 2025-12-23T11:13:03-05:00 hadrian: pass -keep-tmp-files to test ghc when --keep-test-files is enabled This patch makes hadrian pass `-keep-tmp-files` to test ghc when `--keep-test-files` is enabled, so you can check the ghc intermediate files when debugging certain test failures. Closes #26688. - - - - - 13 changed files: - .gitlab/ci.sh - hadrian/cabal.project - hadrian/src/Settings/Builders/RunTest.hs - libraries/base/changelog.md - libraries/base/src/System/IO.hs - libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs - libraries/ghc-internal/src/GHC/Internal/System/IO.hs - rts/PrimOps.cmm - testsuite/tests/interface-stability/base-exports.stdout - testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs - testsuite/tests/interface-stability/base-exports.stdout-mingw32 - testsuite/tests/interface-stability/base-exports.stdout-ws-32 - utils/deriveConstants/Main.hs Changes: ===================================== .gitlab/ci.sh ===================================== @@ -8,7 +8,7 @@ set -Eeuo pipefail # Configuration: # N.B. You may want to also update the index-state in hadrian/cabal.project. -HACKAGE_INDEX_STATE="2025-01-27T17:45:32Z" +HACKAGE_INDEX_STATE="2025-12-19T19:24:24Z" MIN_HAPPY_VERSION="1.20" MIN_ALEX_VERSION="3.2.6" ===================================== hadrian/cabal.project ===================================== @@ -4,11 +4,11 @@ packages: ./ -- This essentially freezes the build plan for hadrian -- It would be wise to keep this up to date with the state set in .gitlab/ci.sh. -index-state: 2025-01-27T17:45:32Z +index-state: 2025-12-19T19:24:24Z --- unordered-containers-0.2.20-r1 requires template-haskell < 2.22 --- ghc-9.10 has template-haskell-2.22.0.0 -allow-newer: unordered-containers:template-haskell +-- Fixes bootstrapping with ghc-9.14 +allow-newer: all:base, all:ghc-bignum, all:template-haskell +constraints: hashable >= 1.5.0.0 -- N.B. Compile with -O0 since this is not a performance-critical executable -- and the Cabal takes nearly twice as long to build with -O1. See #16817. ===================================== hadrian/src/Settings/Builders/RunTest.hs ===================================== @@ -47,12 +47,20 @@ runTestGhcFlags = do then "-optc-fno-builtin" else "" + -- Also pass -keep-tmp-files to GHC when --keep-test-files is + -- passed to hadrian for debugging purpose (#26688) + keepFiles <- testKeepFiles <$> userSetting defaultTestArgs + let keepTmpFilesFlag + | keepFiles = "-keep-tmp-files" + | otherwise = "" + -- Take flags to send to the Haskell compiler from test.mk. -- See: https://github.com/ghc/ghc/blob/master/testsuite/mk/test.mk#L37 unwords <$> sequence [ pure " -dcore-lint -dstg-lint -dcmm-lint -no-user-package-db -fno-dump-with-ways -fprint-error-index-links=never -rtsopts" , pure ghcOpts , pure ghcExtraFlags + , pure keepTmpFilesFlag , ifMinGhcVer "711" "-fno-warn-missed-specialisations" , ifMinGhcVer "711" "-fshow-warning-groups" , ifMinGhcVer "801" "-fdiagnostics-color=never" ===================================== libraries/base/changelog.md ===================================== @@ -1,6 +1,7 @@ # Changelog for [`base` package](http://hackage.haskell.org/package/base) ## 4.23.0.0 *TBA* + * Add `System.IO.hGetNewlineMode`. ([CLC proposal #370](https://github.com/haskell/core-libraries-committee/issues/370)) * Add `{-# WARNING in "x-partial" #-}` to `Data.List.{init,last}`. Use `{-# OPTIONS_GHC -Wno-x-partial #-}` to disable it. ([CLC proposal #87](https://github.com/haskell/core-libraries-committee/issues/292)) ===================================== libraries/base/src/System/IO.hs ===================================== @@ -175,6 +175,7 @@ module System.IO -- Binary-mode 'Handle's do no newline translation at all. hSetNewlineMode, + hGetNewlineMode, Newline(..), nativeNewline, NewlineMode(..), ===================================== libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs ===================================== @@ -40,7 +40,7 @@ module GHC.Internal.IO.Handle ( hIsOpen, hIsClosed, hIsReadable, hIsWritable, hGetBuffering, hIsSeekable, hSetEcho, hGetEcho, hIsTerminalDevice, - hSetNewlineMode, Newline(..), NewlineMode(..), nativeNewline, + hSetNewlineMode, hGetNewlineMode, Newline(..), NewlineMode(..), nativeNewline, noNewlineTranslation, universalNewlineMode, nativeNewlineMode, hShow, @@ -238,7 +238,7 @@ hSetBuffering handle mode = return Handle__{ haBufferMode = mode,.. } -- ----------------------------------------------------------------------------- --- hSetEncoding +-- Setting and getting the text encoding -- | The action 'hSetEncoding' @hdl@ @encoding@ changes the text encoding -- for the handle @hdl@ to @encoding@. The default encoding when a 'Handle' is @@ -624,16 +624,24 @@ hSetBinaryMode handle bin = haOutputNL = outputNL nl, .. } -- ----------------------------------------------------------------------------- --- hSetNewlineMode +-- Setting and getting the newline mode --- | Set the 'NewlineMode' on the specified 'Handle'. All buffered +-- | Set the 'NewlineMode' for the specified 'Handle'. All buffered -- data is flushed first. hSetNewlineMode :: Handle -> NewlineMode -> IO () -hSetNewlineMode handle NewlineMode{ inputNL=i, outputNL=o } = +hSetNewlineMode handle NewlineMode{..} = withAllHandles__ "hSetNewlineMode" handle $ \h_@Handle__{} -> do flushBuffer h_ - return h_{ haInputNL=i, haOutputNL=o } + return h_{ haInputNL = inputNL, haOutputNL = outputNL } + +-- | Return the current 'NewlineMode' for the specified 'Handle'. +-- +-- @since 4.23.0.0 +hGetNewlineMode :: Handle -> IO NewlineMode +hGetNewlineMode hdl = + withHandle_ "hGetNewlineMode" hdl $ \h_@Handle__{..} -> + return NewlineMode{ inputNL = haInputNL, outputNL = haOutputNL } -- ----------------------------------------------------------------------------- -- Duplicating a Handle ===================================== libraries/ghc-internal/src/GHC/Internal/System/IO.hs ===================================== @@ -214,6 +214,7 @@ module GHC.Internal.System.IO ( -- Binary-mode 'Handle's do no newline translation at all. -- hSetNewlineMode, + hGetNewlineMode, Newline(..), nativeNewline, NewlineMode(..), noNewlineTranslation, universalNewlineMode, nativeNewlineMode, ===================================== rts/PrimOps.cmm ===================================== @@ -204,12 +204,47 @@ stg_isMutableByteArrayWeaklyPinnedzh ( gcptr mba ) stg_shrinkMutableByteArrayzh ( gcptr mba, W_ new_size ) // MutableByteArray# s -> Int# -> State# s -> State# s { - ASSERT(new_size <= StgArrBytes_bytes(mba)); + W_ old_size, old_wds, new_wds; + W_ bd; + + old_size = StgArrBytes_bytes(mba); + ASSERT(new_size <= old_size); + old_wds = BYTES_TO_WDS(SIZEOF_StgArrBytes) + ROUNDUP_BYTES_TO_WDS(old_size); + new_wds = BYTES_TO_WDS(SIZEOF_StgArrBytes) + ROUNDUP_BYTES_TO_WDS(new_size); + + // Try to shrink bd->free as well, to reclaim slop space at the end + // of current block and avoid unnecessary fragmentation. But we + // must guarantee that: + // + // 1. mba is already at the end of current block (check bd->free). + // Otherwise we can't move closures that come after it anyway. + // 2. It's a nursery block that belongs to the current Capability, + // so check rCurrentAlloc (used by allocateMightFail) or + // pinned_object_block (used by allocatePinned). There's also no + // point if it's an older generation block, the mutator won't + // allocate into those blocks anyway. + // + // If check fails, fall back to the conservative code path: just + // zero the slop and return. + bd = Bdescr(mba); + if (bdescr_free(bd) != mba + WDS(old_wds) || + (bd != StgRegTable_rCurrentAlloc(BaseReg) && bd != Capability_pinned_object_block(MyCapability()))) { + OVERWRITING_CLOSURE_MUTABLE(mba, new_wds); + StgArrBytes_bytes(mba) = new_size; + // No need to call PROF_HEADER_CREATE. See Note [LDV profiling and resizing arrays] + return (); + } - OVERWRITING_CLOSURE_MUTABLE(mba, (BYTES_TO_WDS(SIZEOF_StgArrBytes) + - ROUNDUP_BYTES_TO_WDS(new_size))); + // Check passes, we can shrink bd->free! Also uninitialize the slop + // if zero_on_gc is enabled, to conform with debug RTS convention. StgArrBytes_bytes(mba) = new_size; - // No need to call PROF_HEADER_CREATE. See Note [LDV profiling and resizing arrays] + IF_DEBUG(zero_on_gc, + prim %memset(mba + WDS(new_wds), + 0xaa, + WDS(old_wds - new_wds), + 1); + ); + bdescr_free(bd) = mba + WDS(new_wds); return (); } @@ -223,18 +258,10 @@ stg_shrinkMutableByteArrayzh ( gcptr mba, W_ new_size ) stg_resizzeMutableByteArrayzh ( gcptr mba, W_ new_size ) // MutableByteArray# s -> Int# -> State# s -> (# State# s,MutableByteArray# s #) { - W_ new_size_wds; - - ASSERT(new_size >= 0); - - new_size_wds = ROUNDUP_BYTES_TO_WDS(new_size); - - if (new_size_wds <= BYTE_ARR_WDS(mba)) { - OVERWRITING_CLOSURE_MUTABLE(mba, (BYTES_TO_WDS(SIZEOF_StgArrBytes) + - new_size_wds)); - StgArrBytes_bytes(mba) = new_size; - // No need to call PROF_HEADER_CREATE. See Note [LDV profiling and resizing arrays] + ASSERT(new_size `ge` 0); + if (new_size <= StgArrBytes_bytes(mba)) { + call stg_shrinkMutableByteArrayzh(mba, new_size); return (mba); } else { (P_ new_mba) = call stg_newByteArrayzh(new_size); ===================================== testsuite/tests/interface-stability/base-exports.stdout ===================================== @@ -10263,6 +10263,7 @@ module System.IO where hGetEcho :: Handle -> IO GHC.Internal.Types.Bool hGetEncoding :: Handle -> IO (GHC.Internal.Maybe.Maybe TextEncoding) hGetLine :: Handle -> IO GHC.Internal.Base.String + hGetNewlineMode :: Handle -> IO NewlineMode hGetPosn :: Handle -> IO HandlePosn hIsClosed :: Handle -> IO GHC.Internal.Types.Bool hIsEOF :: Handle -> IO GHC.Internal.Types.Bool ===================================== testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs ===================================== @@ -13309,6 +13309,7 @@ module System.IO where hGetEcho :: Handle -> IO GHC.Internal.Types.Bool hGetEncoding :: Handle -> IO (GHC.Internal.Maybe.Maybe TextEncoding) hGetLine :: Handle -> IO GHC.Internal.Base.String + hGetNewlineMode :: Handle -> IO NewlineMode hGetPosn :: Handle -> IO HandlePosn hIsClosed :: Handle -> IO GHC.Internal.Types.Bool hIsEOF :: Handle -> IO GHC.Internal.Types.Bool ===================================== testsuite/tests/interface-stability/base-exports.stdout-mingw32 ===================================== @@ -10543,6 +10543,7 @@ module System.IO where hGetEcho :: Handle -> IO GHC.Internal.Types.Bool hGetEncoding :: Handle -> IO (GHC.Internal.Maybe.Maybe TextEncoding) hGetLine :: Handle -> IO GHC.Internal.Base.String + hGetNewlineMode :: Handle -> IO NewlineMode hGetPosn :: Handle -> IO HandlePosn hIsClosed :: Handle -> IO GHC.Internal.Types.Bool hIsEOF :: Handle -> IO GHC.Internal.Types.Bool ===================================== testsuite/tests/interface-stability/base-exports.stdout-ws-32 ===================================== @@ -10263,6 +10263,7 @@ module System.IO where hGetEcho :: Handle -> IO GHC.Internal.Types.Bool hGetEncoding :: Handle -> IO (GHC.Internal.Maybe.Maybe TextEncoding) hGetLine :: Handle -> IO GHC.Internal.Base.String + hGetNewlineMode :: Handle -> IO NewlineMode hGetPosn :: Handle -> IO HandlePosn hIsClosed :: Handle -> IO GHC.Internal.Types.Bool hIsEOF :: Handle -> IO GHC.Internal.Types.Bool ===================================== utils/deriveConstants/Main.hs ===================================== @@ -395,6 +395,7 @@ wanteds os = concat ,fieldOffset Both "StgRegTable" "rCurrentTSO" ,fieldOffset Both "StgRegTable" "rCurrentNursery" ,fieldOffset Both "StgRegTable" "rHpAlloc" + ,structField C "StgRegTable" "rCurrentAlloc" ,structField C "StgRegTable" "rRet" ,structField C "StgRegTable" "rNursery" @@ -414,6 +415,7 @@ wanteds os = concat ,structField C "Capability" "weak_ptr_list_hd" ,structField C "Capability" "weak_ptr_list_tl" ,structField C "Capability" "n_run_queue" + ,structField C "Capability" "pinned_object_block" ,structField Both "bdescr" "start" ,structField Both "bdescr" "free" @@ -629,6 +631,8 @@ wanteds os = concat "RTS_FLAGS" "DebugFlags.sanity" ,structField_ C "RtsFlags_DebugFlags_weak" "RTS_FLAGS" "DebugFlags.weak" + ,structField_ C "RtsFlags_DebugFlags_zero_on_gc" + "RTS_FLAGS" "DebugFlags.zero_on_gc" ,structField_ C "RtsFlags_GcFlags_initialStkSize" "RTS_FLAGS" "GcFlags.initialStkSize" ,structField_ C "RtsFlags_MiscFlags_tickInterval" View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/988619c7a08ff8daf53ce835c34ca3… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/988619c7a08ff8daf53ce835c34ca3… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T26548] 107 commits: Build external interpreter program on demand (#24731)
by Simon Peyton Jones (＠simonpj) 23 Dec '25

23 Dec '25

Simon Peyton Jones pushed to branch wip/T26548 at Glasgow Haskell Compiler / GHC Commits: 55eab80d by Sylvain Henry at 2025-11-20T17:33:13-05:00 Build external interpreter program on demand (#24731) This patch teaches GHC how to build the external interpreter program when it is missing. As long as we have the `ghci` library, doing this is trivial so most of this patch is refactoring for doing it sanely. - - - - - 08bbc028 by Rodrigo Mesquita at 2025-11-20T17:33:54-05:00 Add tests for #23973 and #26565 These were fixed by 4af4f0f070f83f948e49ad5d7835fd91b8d3f0e6 in !10417 - - - - - 6b42232c by sheaf at 2025-11-20T17:34:35-05:00 Mark T26410_ffi as fragile on Windows As seen in #26595, this test intermittently fails on Windows. This commit marks it as fragile, until we get around to fixing it. - - - - - b7b7c049 by Andrew Lelechenko at 2025-11-21T21:04:01+00:00 Add nubOrd / nubOrdBy to Data.List and Data.List.NonEmpty As per https://github.com/haskell/core-libraries-committee/issues/336 - - - - - 352d5462 by Marc Scholten at 2025-11-22T10:33:03-05:00 Fix haddock test runner to handle UTF-8 output xhtml 3000.4.0.0 now produces UTF-8 output instead of escaping non-ASCII characters. When using --test-accept it previously wrote files in the wrong encoding because they have not been decoded properly when reading the files. - - - - - 48a3ed57 by Simon Peyton Jones at 2025-11-25T15:33:54+00:00 Add a fast-path for args=[] to occAnalApp In the common case of having not arguments, occAnalApp was doing redundant work. - - - - - 951e5ed9 by Simon Peyton Jones at 2025-11-25T15:33:54+00:00 Fix a performance hole in the occurrence analyser As #26425 showed, the clever stuff in Note [Occurrence analysis for join points] does a lot of duplication of usage details. This patch improved matters with a little fancy footwork. It is described in the new (W4) of the same Note. Compile-time allocations go down slightly. Here are the changes of +/- 0.5% or more: T13253(normal) 329,369,244 326,395,544 -0.9% T13253-spj(normal) 66,410,496 66,095,864 -0.5% T15630(normal) 129,797,200 128,663,136 -0.9% T15630a(normal) 129,212,408 128,027,560 -0.9% T16577(normal) 6,756,706,896 6,723,028,512 -0.5% T18282(normal) 128,462,070 125,808,584 -2.1% GOOD T18698a(normal) 208,418,305 202,037,336 -3.1% GOOD T18730(optasm) 136,981,756 136,208,136 -0.6% T18923(normal) 58,103,088 57,745,840 -0.6% T19695(normal) 1,386,306,272 1,365,609,416 -1.5% T26425(normal) 3,344,402,957 2,457,811,664 -26.5% GOOD T6048(optasm) 79,763,816 79,212,760 -0.7% T9020(optasm) 225,278,408 223,682,440 -0.7% T9961(normal) 303,810,717 300,729,168 -1.0% GOOD geo. mean -0.5% minimum -26.5% maximum +0.4% Metric Decrease: T18282 T18698a T26425 T9961 - - - - - f1959dfc by Simon Peyton Jones at 2025-11-26T11:58:07+00:00 Remove a quadratic-cost assertion check in mkCoreApp See the new Note [Assertion checking in mkCoreApp] - - - - - 98fa0d36 by Simon Hengel at 2025-11-27T17:54:57-05:00 Fix typo in docs/users_guide/exts/type_families.rst - - - - - 5b97e5ce by Simon Hengel at 2025-11-27T17:55:37-05:00 Fix broken RankNTypes example in user's guide - - - - - fa2aaa00 by Simon Peyton Jones at 2025-11-27T17:56:18-05:00 Switch off specialisation in ExactPrint In !15057 (where we re-introduced -fpolymoprhic-specialisation) we found that ExactPrint's compile time blew up by a factor of 5. It turned out to be caused by bazillions of specialisations of `markAnnotated`. Since ExactPrint isn't perf-critical, it does not seem worth taking the performance hit, so this patch switches off specialisation in this one module. - - - - - 1fd25987 by Simon Peyton Jones at 2025-11-27T17:56:18-05:00 Switch -fpolymorphic-specialisation on by default This patch addresses #23559. Now that !10479 has landed and #26329 is fixed, we can switch on polymorphic specialisation by default, addressing a bunch of other tickets listed in #23559. Metric changes: * CoOpt_Singleton: +4% compiler allocations: we just get more specialisations * info_table_map_perf: -20% decrease in compiler allocations. This is caused by using -fno-specialise in ExactPrint.hs Without that change we get a 4x blow-up in compile time; see !15058 for details Metric Decrease: info_table_map_perf Metric Increase: CoOpt_Singletons - - - - - b7fe7445 by Matthew Pickering at 2025-11-27T17:56:59-05:00 rts: Fix a deadlock with eventlog flush interval and RTS shutdown The ghc_ticker thread attempts to flush at the eventlog tick interval, this requires waiting to take all capabilities. At the same time, the main thread is shutting down, the schedule is stopped and then we wait for the ticker thread to finish. Therefore we are deadlocked. The solution is to use `newBoundTask/exitMyTask`, so that flushing can cooperate with the scheduler shutdown. Fixes #26573 - - - - - 1d4a1229 by sheaf at 2025-11-27T17:58:02-05:00 SimpleOpt: don't subst in pushCoercionIntoLambda It was noticed in #26589 that the change in 15b311be was incorrect: the simple optimiser carries two different substitution-like pieces of information: 'soe_subst' (from InVar to OutExpr) and 'soe_inl' (from InId to InExpr). It is thus incorrect to have 'pushCoercionIntoLambda' apply the substitution from 'soe_subst' while discarding 'soe_inl' entirely, which is what was done in 15b311be. Instead, we change back pushCoercionIntoLambda to take an InScopeSet, and optimise the lambda before calling 'pushCoercionIntoLambda' to avoid mixing InExpr with OutExpr, or mixing two InExpr with different environments. We can then call 'soeZapSubst' without problems. Fixes #26588 #26589 - - - - - 84a087d5 by Sylvain Henry at 2025-11-28T17:35:28-05:00 Fix PIC jump tables on Windows (#24016) Avoid overflows in jump tables by using a base label closer to the jump targets. See added Note [Jump tables] - - - - - 82db7042 by Zubin Duggal at 2025-11-28T17:36:10-05:00 rts/linker/PEi386: Copy strings before they are inserted into LoadedDllCache. The original strings are temporary and might be freed at an arbitrary point. Fixes #26613 - - - - - ff3f0d09 by Ben Gamari at 2025-11-29T18:34:28-05:00 gitlab-ci: Run ghcup-metadata jobs on OpenCape runners This significantly reduces our egress traffic and makes the jobs significantly faster. - - - - - ef0dc33b by Matthew Pickering at 2025-11-29T18:35:10-05:00 Use 'OsPath' in getModificationTimeIfExists This part of the compiler is quite hot during recompilation checking in particular since the filepaths will be translated to a string. It is better to use the 'OsPath' native function, which turns out to be easy to do. - - - - - fa3bd0a6 by Georgios Karachalias at 2025-11-29T18:36:05-05:00 Use OsPath in PkgDbRef and UnitDatabase, not FilePath - - - - - 0d7c05ec by Ben Gamari at 2025-12-01T03:13:46-05:00 hadrian: Place user options after package arguments This makes it easier for the user to override the default package arguments with `UserSettings.hs`. Fixes #25821. ------------------------- Metric Decrease: T14697 ------------------------- - - - - - 3b2c4598 by Vladislav Zavialov at 2025-12-01T03:14:29-05:00 Namespace-specified wildcards in import/export lists (#25901) This change adds support for top-level namespace-specified wildcards `type ..` and `data ..` to import and export lists. Examples: import M (type ..) -- imports all type and class constructors from M import M (data ..) -- imports all data constructors and terms from M module M (type .., f) where -- exports all type and class constructors defined in M, -- plus the function 'f' The primary intended usage of this feature is in combination with module aliases, allowing namespace disambiguation: import Data.Proxy as T (type ..) -- T.Proxy is unambiguously the type constructor import Data.Proxy as D (data ..) -- D.Proxy is unambiguously the data constructor The patch accounts for the interactions of wildcards with: * Imports with `hiding` clauses * Import warnings -Wunused-imports, -Wdodgy-imports * Export warnings -Wduplicate-exports, -Wdodgy-exports Summary of the changes: 1. Move the NamespaceSpecifier type from GHC.Hs.Binds to GHC.Hs.Basic, making it possible to use it in more places in the AST. 2. Extend the AST (type: IE) with a representation of `..`, `type ..`, and `data ..` (constructor: IEWholeNamespace). Per the proposal, the plain `..` is always rejected with a dedicated error message. 3. Extend the grammar in Parser.y with productions for `..`, `type ..`, and `data ..` in both import and export lists. 4. Implement wildcard imports by updating the `filterImports` function in GHC.Rename.Names; the logic for IEWholeNamespace is roughly modeled after the Nothing (no explicit import list) case. 5. Implement wildcard exports by updating the `exports_from_avail` function in GHC.Tc.Gen.Export; the logic for IEWholeNamespace is closely modeled after the IEModuleContents case. 6. Refactor and extend diagnostics to report the new warnings and errors. See PsErrPlainWildcardImport, DodgyImportsWildcard, PsErrPlainWildcardExport, DodgyExportsWildcard, TcRnDupeWildcardExport. Note that this patch is specifically about top-level import/export items. Subordinate import/export items are left unchanged. - - - - - c71faa76 by Luite Stegeman at 2025-12-01T03:16:05-05:00 rts: Handle overflow of ELF section header string table If the section header string table is stored in a section greater than or equal to SHN_LORESERVE (0xff00), the 16-bit field e_shstrndx in the ELF header does not contain the section number, but rather an overflow value SHN_XINDEX (0xffff) indicating that we need to look elsewhere. This fixes the linker by not using e_shstrndx directly but calling elf_shstrndx, which correctly handles the SHN_XINDEX value. Fixes #26603 - - - - - ab20eb54 by Mike Pilgrem at 2025-12-01T22:46:55+00:00 Re CLC issue 292 Warn GHC.Internal.List.{init,last} are partial Also corrects the warning for `tail` to refer to `Data.List.uncons` (like the existing warning for `head`). In module `Settings.Warnings`, applies `-Wno-x-partial` to the `filepath`, and `parsec` packages (outside GHC's repository). Also bumps submodules. - - - - - fc1d7f79 by Jade Lovelace at 2025-12-02T11:04:09-05:00 docs: fix StandaloneKindSignatures in DataKinds docs These should be `type` as otherwise GHC reports a duplicate definition error. - - - - - beae879b by Rodrigo Mesquita at 2025-12-03T15:42:37+01:00 task: Substitute some datatypes for newtypes * Substitutes some data type declarations for newtype declarations * Adds comment to `LlvmConfigCache`, which must decidedly not be a newtype. Fixes #23555 - - - - - 3bd7dd44 by mangoiv at 2025-12-04T04:36:45-05:00 Renamer: reinstate the template haskell level check in notFound Out-of-scope names might be caused by a staging error, as is explained by Note [Out of scope might be a staging error] in GHC.Tc.Utils.Env.hs. This logic was assumed to be dead code after 217caad1 and has thus been removed. This commit reintroduces it and thus fixes issue #26099. - - - - - 0318010b by Zubin Duggal at 2025-12-04T04:37:27-05:00 testlib: Optionally include the way name in the expected output file This allows us to have different outputs for different ways. - - - - - 6d945fdd by Zubin Duggal at 2025-12-04T04:37:27-05:00 testsuite: Accept output of tests failing in ext-interp way due to differing compilation requirements Fixes #26552 - - - - - 0ffc5243 by Cheng Shao at 2025-12-04T04:38:09-05:00 devx: minor fixes for compile_flags.txt This patch includes minor fixes for compile_flags.txt to improve developer experience when using clangd as language server to hack on RTS C sources: - Ensure `-fPIC` is passed and `__PIC__` is defined, to be coherent with `-DDYNAMIC` and ensure the `__PIC__` guarded code paths are indexed - Add the missing `-DRtsWay` definition, otherwise a few source files like `RtsUtils.c` and `Trace.c` would produce clangd errors - - - - - e36a5fcb by Matthew Pickering at 2025-12-05T16:25:57-05:00 Add support for building bytecode libraries A bytecode library is a collection of bytecode files (.gbc) and a library which combines together additional object files. A bytecode library is created by invoking GHC with the `-bytecodelib` flag. A library can be created from in-memory `ModuleByteCode` linkables or by passing `.gbc` files as arguments on the command line. Fixes #26298 - - - - - 8f9ae339 by Matthew Pickering at 2025-12-05T16:25:57-05:00 Load bytecode libraries to satisfy package dependencies This commit allows you to use a bytecode library to satisfy a package dependency when using the interpreter. If a user enables `-fprefer-byte-code`, then if a package provides a bytecode library, that will be loaded and used to satisfy the dependency. The main change is to separate the relevant parts of the `LoaderState` into external and home package byte code. Bytecode is loaded into either the home package or external part (similar to HPT/EPS split), HPT bytecode can be unloaded. External bytecode is never unloaded. The unload function has also only been called with an empty list of "stable linkables" for a long time. It has been modified to directly implement a complete unloading of the home package bytecode linkables. At the moment, the bytecode libraries are found in the "library-dirs" field from the package description. In the future when `Cabal` implements support for "bytecode-library-dirs" field, we can read the bytecode libraries from there. No changes to the Cabal submodule are necessary at the moment. Four new tests are added in testsuite/tests/cabal, which generate fake package descriptions and test loading the libraries into GHCi. Fixes #26298 - - - - - 54458ce4 by mangoiv at 2025-12-05T16:26:50-05:00 ExplicitLevelImports: improve documentation of the code - more explicit names for variable names like `flg` or `topLevel` - don't pass the same value twice to functions - some explanations of interesting but undocumented code paths - adjust comment to not mention non-existent error message - - - - - c7061392 by mangoiv at 2025-12-05T16:27:42-05:00 driver: don't expect nodes to exist when checking paths between them In `mgQueryZero`, previously node lookups were expected to never fail, i.e. it was expected that when calculating the path between two nodes in a zero level import graph, both nodes would always exist. This is not the case, e.g. in some situations involving exact names (see the test-case). The fix is to first check whether the node is present in the graph at all, instead of panicking, just to report that there is no path. Closes #26568 - - - - - d6cf8463 by Peng Fan at 2025-12-06T11:06:28-05:00 NCG/LA64: Simplify genCCall into two parts genCCall is too long, so it's been simplified into two parts: genPrim and genLibCCall. Suggested by Andreas Klebinger - - - - - 9d371d23 by Matthew Pickering at 2025-12-06T11:07:09-05:00 hadrian: Use a response file to invoke GHC for dep gathering. In some cases we construct an argument list too long for GHC to handle directly on windows. This happens when we generate the dependency file because the command line will contain references to a large number of .hs files. To avoid this we now invoke GHC using a response file when generating dependencies to sidestep length limitations. Note that we only pass the actual file names in the dependency file. Why? Because this side-steps #26560 - - - - - 0043bfb0 by Marc Scholten at 2025-12-06T11:08:03-05:00 update xhtml to 3000.4.0.0 haddock-api: bump xhtml bounds haddock-api: use lazy text instead of string to support xhtml 3000.4.0.0 Bumping submodule xhtml to 3000.4.0.0 add xhtml to stage0Packages remove unused import of writeUtf8File Remove redundant import Update haddock golden files for xhtml 3000.4.0.0 Metric Decrease: haddock.Cabal haddock.base - - - - - fc958fc9 by Julian Ospald at 2025-12-06T11:08:53-05:00 rts: Fix object file format detection in loadArchive Commit 76d1041dfa4b96108cfdd22b07f2b3feb424dcbe seems to have introduced this bug, ultimately leading to failure of test T11788. I can only theorize that this test isn't run in upstream's CI, because they don't build a static GHC. The culprit is that we go through the thin archive, trying to follow the members on the filesystem, but don't re-identify the new object format of the member. This pins `object_fmt` to `NotObject` from the thin archive. Thanks to @angerman for spotting this. - - - - - 0f297f6e by mangoiv at 2025-12-06T11:09:44-05:00 users' guide: don't use f strings in the python script to ensure compatibility with python 3.5 - - - - - 3bfe7aa2 by Matthew Pickering at 2025-12-07T12:18:57-05:00 ci: Try using multi repl in ghc-in-ghci test This should be quite a bit faster than the ./hadrian/ghci command as it doesn't properly build all the dependencies. - - - - - 2ef1601a by Rodrigo Mesquita at 2025-12-07T12:19:38-05:00 Stack.Decode: Don't error on bitmap size 0 A RET_BCO may have a bitmap with no payload. In that case, the bitmap = 0. One can observe this by using -ddump-bcos and interpreting ``` main = pure () ``` Observe, for instance, that the BCO for this main function has size 0: ``` ProtoBCO Main.main#0: \u [] break<main:Main,0>() GHC.Internal.Base.pure GHC.Internal.Base.$fApplicativeIO GHC.Internal.Tuple.() bitmap: 0 [] BRK_FUN <breakarray> main:Main 0 <cc> PACK () 0 PUSH_G GHC.Internal.Base.$fApplicativeIO PUSH_APPLY_PP PUSH_G GHC.Internal.Base.pure ENTER ``` Perhaps we never tried to decode a stack in which a BCO like this was present. However, for the debugger, we want to decode stacks of threads stopped at breakpoints, and these kind of BCOs do get on a stack under e.g. `stg_apply_interp_info` frames. See the accompanying test in the next commit for an example to trigger the bug this commit fixes. Fixes #26640 - - - - - 747153d2 by Rodrigo Mesquita at 2025-12-07T12:19:38-05:00 Add test for #26640 - - - - - d4b1e353 by Simon Hengel at 2025-12-10T00:00:02-05:00 Fix syntax error in gadt_syntax.rst - - - - - 91cc8be6 by Cheng Shao at 2025-12-10T00:00:43-05:00 ci: fix "ci.sh clean" to address frequent out of space error on windows runners This patch fixes the `ci.sh clean` logic to address frequent out of space error on windows runners; previously it didn't clean up the inplace mingw blobs, which is the largest source of space leak on windows runners. See added comment for detailed explanation. - - - - - fe2b79f4 by Recursion Ninja at 2025-12-10T08:34:18-05:00 Narrow before optimising MUL/DIV/REM into shifts The MUL/DIV/REM operations can be optimised into shifts when one of the operands is a constant power of 2. However, as literals in Cmm are stored as 'Integer', for this to be correct we first need to narrow the literal to the appropriate width before checking whether the literal is a power of 2. Fixes #25664 - - - - - 06c2349c by Recursion Ninja at 2025-12-10T08:34:58-05:00 Decouple 'Language.Haskell.Syntax.Type' from 'GHC.Utils.Panic' - Remove the *original* defintion of 'hsQTvExplicit' defined within 'Language.Haskell.Syntax.Type' - Redefine 'hsQTvExplicit' as 'hsq_explicit' specialized to 'GhcPass' exported by 'GHC.Utils.Panic' - Define 'hsQTvExplicitBinders' as 'hsq_explicit' specialized to 'DocNameI' exported by 'Haddock.GhcUtils'. - Replace all call sites of the original 'hsQTvExplicit' definition with either: 1. 'hsQTvExplicit' updated definition 2. 'hsQTvExplicitBinders' All call sites never entered the 'XLHsQTyVars' constructor branch, but a call to 'panic' existed on this code path because the type system was not strong enought to guarantee that the 'XLHsQTyVars' construction was impossible. These two specialized functions provide the type system with enough information to make that guarantee, and hence the dependancy on 'panic' can be removed. - - - - - ac0815d5 by sheaf at 2025-12-10T23:39:57-05:00 Quantify arg before mult in function arrows As noted in #23764, we expect quantification order to be left-to-right, so that in a type such as a %m -> b the inferred quantification order should be [a, m, b] and not [m, a, b]. This was addressed in commit d31fbf6c, but that commit failed to update some other functions such as GHC.Core.TyCo.FVs.tyCoFVsOfType. This affects Haddock, as whether we print an explicit forall or not depends on whether the inferred quantification order matches the actual quantification order. - - - - - 2caf796e by sheaf at 2025-12-10T23:39:57-05:00 Haddock: improvements to ty-var quantification This commit makes several improvements to how Haddock deals with the quantification of type variables: 1. In pattern synonyms, Haddock used to jumble up universal and existential quantification. That is now fixed, fixing #26252. Tested in the 'PatternSyns2' haddock-html test. 2. The logic for computing whether to use an explicit kind annotation for a type variable quantified in a forall was not even wrong. This commit improves the heuristic, but it will always remain an imperfect heuristic (lest we actually run kind inference again). In the future (#26271), we hope to avoid reliance on this heuristic. - - - - - b14bdd59 by Teo Camarasu at 2025-12-10T23:40:38-05:00 Add explicit export list to GHC.Num Let's make clear what this module exports to allow us to easily deprecate and remove some of these in the future. Resolves https://gitlab.haskell.org/ghc/ghc/-/issues/26625 - - - - - d99f8326 by Cheng Shao at 2025-12-11T19:14:18-05:00 compiler: remove unused CPP code in foreign stub This patch removes unused CPP code in the generated foreign stub: - `#define IN_STG_CODE 0` is not needed, since `Rts.h` already includes this definition - The `if defined(__cplusplus)` code paths are not needed in the `.c` file, since we don't generate C++ stubs and don't include C++ headers in our stubs. But it still needs to be present in the `.h` header since it might be later included into C++ source files. - - - - - 46c9746f by Cheng Shao at 2025-12-11T19:14:57-05:00 configure: bump LlvmMaxVersion to 22 This commit bumps LlvmMaxVersion to 22; 21.x releases have been available since Aug 26th, 2025 and there's no regressions with 21.x so far. This bump is also required for updating fedora image to 43. - - - - - 96fce8d0 by Cheng Shao at 2025-12-12T01:17:51+01:00 hadrian: add support for building with UndefinedBehaviorSanitizer This patch adds a +ubsan flavour transformer to hadrian to build all stage1+ C/C++ code with UndefinedBehaviorSanitizer. This is particularly useful to catch potential undefined behavior in the RTS codebase. - - - - - f7a06d8c by Cheng Shao at 2025-12-12T01:17:51+01:00 ci: update alpine/fedora & add ubsan job This patch updates alpine image to 3.23, fedora image to 43, and adds a `x86_64-linux-fedora43-validate+debug_info+ubsan` job that's run in validate/nightly pipelines to catch undefined behavior in the RTS codebase. - - - - - 2ccd11ca by Cheng Shao at 2025-12-12T01:17:51+01:00 rts: fix zero-length VLA undefined behavior in interpretBCO This commit fixes a zero-length VLA undefined behavior in interpretBCO, caught by UBSan: ``` +rts/Interpreter.c:3133:19: runtime variable length array bound evaluates to non-positive value 0 ``` - - - - - 4156ed19 by Cheng Shao at 2025-12-12T01:17:51+01:00 rts: fix unaligned ReadSpB in interpretBCO This commit fixes unaligned ReadSpB in interpretBCO, caught by UBSan: ``` +rts/Interpreter.c:2174:64: runtime load of misaligned address 0x004202059dd1 for type 'StgWord', which requires 8 byte alignment ``` To perform proper unaligned read, we define StgUnalignedWord as a type alias of StgWord with aligned(1) attribute, and load StgUnalignedWord instead of StgWord in ReadSpB, so the C compiler is aware that we're not loading with natural alignment. - - - - - fef89fb9 by Cheng Shao at 2025-12-12T01:17:51+01:00 rts: fix signed integer overflow in subword arithmetic in interpretBCO This commit fixes signed integer overflow in subword arithmetic in interpretBCO, see added note for detailed explanation. - - - - - 3c001377 by Cheng Shao at 2025-12-13T05:03:15-05:00 ci: use treeless fetch for perf notes This patch improves the ci logic for fetching perf notes by using treeless fetch (https://github.blog/open-source/git/get-up-to-speed-with-partial-clone-and-…) to avoid downloading all blobs of the perf notes repo at once, and only fetch the actually required blobs on-demand when needed. This makes the initial `test-metrics.sh pull` operation much faster, and also more robust, since we are seeing an increasing rate of 504 errors in CI when fetching all perf notes at once, which is a major source of CI flakiness at this point. Co-authored-by: Codex <codex(a)openai.com> - - - - - 123a8d77 by Peter Trommler at 2025-12-13T05:03:57-05:00 Cmm: remove restriction in MachOp folding - - - - - 0b54b5fd by Andreas Klebinger at 2025-12-13T05:04:38-05:00 Remove explicit Typeable deriviations. - - - - - 08b13f7b by Cheng Shao at 2025-12-13T05:05:18-05:00 ci: set gc.auto=0 during setup stage This patch sets `gc.auto=0` during `setup` stage of CI, see added comment for detailed explanation. - - - - - 3b5aecb5 by Ben Gamari at 2025-12-13T23:43:10+01:00 Bump exceptions submodule to 0.10.11 - - - - - c32de3b0 by Johan Förberg at 2025-12-15T02:36:03-05:00 base: Define Semigroup and Monoid instances for lazy ST CLC proposal: https://github.com/haskell/core-libraries-committee/issues/374 Fixes #26581 - - - - - 4f8b660c by mangoiv at 2025-12-15T02:37:05-05:00 ci: do not require nightly cabal-reinstall job to succeed - - - - - 2c2a3ef3 by Cheng Shao at 2025-12-15T11:51:53-05:00 docs: drop obsolete warning about -fexternal-interpreter on windows This patch drops an obsolete warning about -fexternal-interpreter not supported on windows; it is supported since a long time ago, including the profiled way. - - - - - 68573aa5 by Marc Scholten at 2025-12-15T11:53:00-05:00 haddock: Drop Haddock.Backends.HaddockDB as it's unused - - - - - b230d549 by mangoiv at 2025-12-16T15:17:45-05:00 base: generalize delete{Firsts,}By When we delete{Firsts,}By we should not require the lists to be the same type. This is an especially useful generalisation in the case of deleteFirstsBy because we can skip an invocation of the map function. This change was discussed on the core-libraries-committee's bug tracker at https://github.com/haskell/core-libraries-committee/issues/372. - - - - - 6a2b43e3 by Cheng Shao at 2025-12-16T15:18:30-05:00 compiler: clean up redundant LANGUAGE pragmas This patch bumps `default-language` of `ghc`/`ghc-bin` from `GHC2021` to `GHC2024` (which is supported in ghc 9.10, current boot ghc lower version bound), and also cleans up redundant `LANGUAGE` pragmas (as well as `default-extensions`/`other-extensions`) that are already implied by `GHC2024`. Co-authored-by: Codex <codex(a)openai.com> - - - - - fca9cd7c by sheaf at 2025-12-18T13:18:18-05:00 X86 CodeGen: fix assign_eax_sse_regs We must set %al to the number of SSE2 registers that contain arguments (in case we are dealing with a varargs function). The logic for counting how many arguments reside in SSE2 registers was incorrect, as it used 'isFloatFormat', which incorrectly ignores vector registers. We now instead do case analysis on the register class: is_sse_reg r = case targetClassOfReg platform r of RcFloatOrVector -> True RcInteger -> False This change is necessary to prevent segfaults in T20030_test1j, because subsequent commits change the format calculations, resulting in vector formats more often. - - - - - 53150617 by sheaf at 2025-12-18T13:18:19-05:00 X86 regUsageOfInstr: fix format for IMUL When used with 8-bit operands, the IMUL instruction returns the result in the lower 16 bits of %rax (also known as %ax). This is different than for the other sizes, where an input at 16, 32 or 64 bits will result in 16, 32 or 64 bits of output in both %rax and %rdx. This doesn't affect the behaviour of the compiler, because we don't allow partial writes at sub-word sizes. The rationale is explained in Wrinkle [Don't allow scalar partial writes] in Note [Register formats in liveness analysis], in GHC.CmmToAsm.Reg.Liveness. - - - - - c7a56dd1 by sheaf at 2025-12-18T13:18:19-05:00 Liveness analysis: consider register formats This commit updates the register allocator to be a bit more careful in situations in which a single register is used at multiple different formats, e.g. when xmm1 is used both to store a Double# and a DoubleX2#. This is done by introducing the 'Regs' newtype around 'UniqSet RegWithFormat', for which the combining operations take the larger of the two formats instead of overriding the format. Operations on 'Regs' are defined in 'GHC.CmmToAsm.Reg.Regs'. There is a modest compile-time cost for the additional overhead for tracking register formats, which causes the metric increases of this commit. The subtle aspects of the implementation are outlined in Note [Register formats in liveness analysis] in GHC.CmmToAsm.Reg.Liveness. Fixes #26411 #26611 ------------------------- Metric Increase: T12707 T26425 T3294 ------------------------- - - - - - c2e83339 by sheaf at 2025-12-18T13:18:19-05:00 Register allocator: reload at same format as spill This commit ensures that if we spill a register onto the stack at a given format, we then always reload the register at this same format. This ensures we don't end up in a situation where we spill F64x2 but end up only reloading the lower F64. This first reload would make us believe the whole data is in a register, thus silently losing the upper 64 bits of the spilled register's contents. Fixes #26526 - - - - - 55ab583b by sheaf at 2025-12-18T13:18:19-05:00 Register allocation: writes redefine format As explained in Note [Allocated register formats] in GHC.CmmToAsm.Reg.Linear, we consider all writes to redefine the format of the register. This ensures that in a situation such as movsd .Ln6m(%rip),%v1 shufpd $0,%v1,%v1 we properly consider the broadcast operation to change the format of %v1 from F64 to F64x2. This completes the fix to #26411 (test in T26411b). - - - - - 951402ed by Vladislav Zavialov at 2025-12-18T13:19:05-05:00 Parser: improve mkModuleImpExp, remove checkImportSpec 1. The `mkModuleImpExp` helper now knows whether it is processing an import or export list item, and uses this information to produce a more accurate error message for `import M (T(..,x))` with PatternSynonyms disabled. The old message incorrectly referred to this case as an export form. 2. The `checkImportSpec` helper is removed in favor of more comprehensive error checking in `mkModuleImpExp`. 3. Additionaly, the invariants of `ImpExpList` and `ImpExpAllWith` have been made more explicit in the comments and assertions (calls to 'panic'). Test case: import-syntax-no-ext - - - - - 47d83d96 by Vladislav Zavialov at 2025-12-18T13:19:06-05:00 Subordinate namespace-specified wildcards (#25901) Add support for subordinate namespace-specified wildcards `X(type ..)` and `X(data ..)` to import and export lists. Examples: import M (Cls(type ..)) -- imports Cls and all its associated types import M (Cls(data ..)) -- imports Cls and all its methods module M (R(data ..), C(type ..)) where -- exports R and all its data constructors and record fields; -- exports C and all its associated types, but not its methods The scope of this change is limited to the case where the wildcard is the only subordinate import/export item, whereas the more complex forms `X(type .., f)` or `X(type .., data ..)` are unsupported and raise the newly introduced PsErrUnsupportedExplicitNamespace error. This restriction may be lifted later. Summary of the changes: 1. Refactor IEThingAll to store its extension field XIEThingAll as a record IEThingAllExt instead of a tuple. 2. Extend the AST by adding a NamespaceSpecifier field to IEThingAllExt, representing an optional namespace specifier `type` or `data` in front of a subordinate wildcard `X(..)`. 3. Extend the grammar in Parser.y with productions for `type ..` and `data ..` in subordinate import/export items. 4. Introduce `filterByNamespaceGREs` to filter [GlobalRdrElt] by a NamespaceSpecifier; use it in `filterImports` and `exports_from_avail` to account for the namespace specifier in IEThingAll. 5. Improve diagnostics by storing more information in DodgyImportsEmptyParent and DodgyExportsEmptyParent. Test cases: T25901_sub_e T25901_sub_f T25901_sub_g T25901_sub_a T25901_sub_b T25901_sub_c T25901_sub_d T25901_sub_w DodgyImports02 DodgyImports03 DodgyImports04 - - - - - eac418bb by Recursion Ninja at 2025-12-18T13:19:48-05:00 Removing the 'Data' instance for 'InstEnv'. The 'Data' instance is blocking work on Trees that Grow, and the 'Data' instance seem to have been added without a clear purpose. - - - - - e920e038 by Recursion Ninja at 2025-12-18T13:19:48-05:00 'Decouple Language.Haskell.Syntax.Decls' from 'GHC.Unit.Module.Warnings' - - - - - bd38b76c by Cheng Shao at 2025-12-18T13:20:31-05:00 testsuite: improve coverage of foundation test This patch refactors the `foundation` test a bit to improve coverage: - Instead of using a hard-coded seed, a random seed is now taken from the command line, and printed upon test failure. This improves test coverage over many future CI runs, and shall a failure occur, the seed is available in the CI log for local reproduction. - The iterations count is bumped to 1000 instead of 100, similar to the bump in `test-primops`. Runtime timeout is bumped 2x just to be safe. - Improve `newLCGGen` by using non-atomic loads/stores on a `MutableByteArray#` for storing mutable `Word64`, this test doesn't use parallelism in the first place - Fixed a few compiler warnings and removed redundant pragmas and imports Co-authored-by: Codex <codex(a)openai.com> - - - - - 3995187c by Sylvain Henry at 2025-12-18T13:21:45-05:00 Doc: document -pgmi "" (#26634) - - - - - 5729418c by Cheng Shao at 2025-12-18T13:22:29-05:00 rts: use __builtin_mul_overflow for hs_mulIntMayOflo This patch uses `__builtin_mul_overflow` to implement `hs_mulIntMayOflo`. This is a GNU C checked arithmetic builtin function supported by gcc/clang, is type-generic so works for both 32-bit/64-bit, and makes the code both more efficient and easier to read/maintain than the previous hand rolled logic. - - - - - 1ca4b49a by Cheng Shao at 2025-12-18T13:23:11-05:00 compiler/rts: fix ABI mismatch in barf() invocations This patch fixes a long-standing issue of ABI mismatch in `barf()` invocations, both in compiler-emitted code and in hand written Cmm code: - In RTS, we have `barf()` which reports a fatal internal error message and exits the program. - `barf()` is a variadic C function! When used as a callee of a foreign call with `ccall` calling convention instead of `capi`, there is an ABI mismatch between the caller and the callee! - Unfortunately, both the compiler and the Cmm sources contain many places where we call `barf()` via `ccall` convention!! Like, when you write `foreign "C" barf("foo object (%p) entered!", R1)`, it totally doesn't do what you think it'll do at all!! The second argument `R1` is not properly passed in `va_list`, and the behavior is completely undefined!! - Even more unfortunately, this issue has been sitting around long enough because the ABI mismatch is subtle enough on normie platforms like x64 and arm64. - But there are platforms like wasm32 that are stricter about ABI, and the broken `barf()` invocations already causes trouble for wasm backend: we had to use ugly hacks like `barf(errmsg, NULL)` to make `wasm-ld` happy, and even with this band-aid, compiler-generated `barf()` invocations are still broken, resulting in regressions in certain debug-related functionality, e.g. `-dtag-inference-checks` is broken on wasm32 (#22882). This patch properly fixes the issue: - We add non-variadic `barf` wrappers in the RTS that can be used as `ccall` callees - Both the compiler `emitBarf` logic and the hand-written Cmm are changed to call these wrappers - `emitBarf` now also properly annotates the foreign call as `CmmNeverReturns` to indicate it's a noreturn call to enable more efficient code generation `-dtag-inference-checks` now works on wasm. Closes #22882. Co-authored-by: Codex <codex(a)openai.com> - - - - - b3dd23b9 by Vilim Lendvaj at 2025-12-18T13:23:57-05:00 Remove outdated comment The Traversable instance for ZipList is no longer in GHC.Internal.Data.Traversable. In fact, it is right below this very comment. - - - - - 9a9c2f03 by Cheng Shao at 2025-12-18T13:24:39-05:00 compiler: remove unused OtherSection logic This patch removes the OtherSection logic in Cmm, given it's never actually used by any of our backends. - - - - - 91edd292 by Wolfgang Jeltsch at 2025-12-19T03:18:19-05:00 Remove unused known-key and name variables for generics This removes the known-key and corresponding name variables for `K1`, `M1`, `R`, `D`, `C`, `S`, and `URec` from `GHC.Generics`, as they are apparently nowhere used in GHC’s source code. - - - - - 73ee7e38 by Wolfgang Jeltsch at 2025-12-19T03:19:02-05:00 Remove unused known keys and names for generics classes This removes the known-key and corresponding name variables for `Datatype`, `Constructor`, and `Selector` from `GHC.Generics`, as they are apparently nowhere used in GHC’s source code. - - - - - f69c5f14 by Cheng Shao at 2025-12-19T03:19:45-05:00 wasm: fix handling of ByteArray#/MutableByteArray# arguments in JSFFI imports This patch fixes the handling of ByteArray#/MutableByteArray# arguments in JSFFI imports, see the amended note and manual for explanation. Also adds a test to witness the fix. Co-authored-by: Codex <codex(a)openai.com> - - - - - 224446a2 by Cheng Shao at 2025-12-20T07:49:54-05:00 rts: workaround -Werror=maybe-uninitialized false positives In some cases gcc might report -Werror=maybe-uninitialized that we know are false positives, but need to workaround it to make validate builds with -Werror pass. - - - - - 251ec087 by Cheng Shao at 2025-12-20T07:49:54-05:00 hadrian: use -Og as C/C++ optimization level when debugging This commit enables -Og as optimization level when compiling the debug ways of rts. According to gcc documentation (https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-Og) -Og is a better choice than -O0 for producing debuggable code. It's also supported by clang as well, so it makes sense to use it as a default for debugging. Also add missing -g3 flag to C++ compilation flags in +debug_info flavour transformer. - - - - - fb586c67 by Cheng Shao at 2025-12-20T07:50:36-05:00 compiler: replace DList with OrdList This patch removes `DList` logic from the compiler and replaces it with `OrdList` which also supports O(1) concatenation and should be more memory efficient than the church-encoded `DList`. - - - - - 8149c987 by Cheng Shao at 2025-12-20T17:06:51-05:00 hadrian: add with_profiled_libs flavour transformer This patch adds a `with_profiled_libs` flavour transformer to hadrian which is the exact opposite of `no_profiled_libs`. It adds profiling ways to stage1+ rts/library ways, and doesn't alter other flavour settings. It is useful when needing to test profiling logic locally with a quick flavour. - - - - - 746b18cd by Cheng Shao at 2025-12-20T17:06:51-05:00 hadrian: fix missing profiled dynamic libraries in profiled_ghc This commit fixes the profiled_ghc flavour transformer to include profiled dynamic libraries as well, since they're supported by GHC since !12595. - - - - - 4dd7e3b9 by Cheng Shao at 2025-12-20T17:07:33-05:00 ci: set http.postBuffer to mitigate perf notes timeout on some runners This patch sets http.postBuffer to mitigate the timeout when fetching perf notes on some runners with slow internet connection. Fixes #26684. - - - - - bc36268a by Wolfgang Jeltsch at 2025-12-21T16:23:24-05:00 Remove unused known keys and names for type representations This removes the known-key and corresponding name variables for `TrName`, `TrNameD`, `TypeRep`, `KindRepTypeLitD`, `TypeLitSort`, and `mkTrType`, as they are apparently nowhere used in GHC’s source code. - - - - - ff5050e9 by Wolfgang Jeltsch at 2025-12-21T16:24:04-05:00 Remove unused known keys and names for natural operations This removes the known-key and corresponding name variables for `naturalAndNot`, `naturalLog2`, `naturalLogBaseWord`, `naturalLogBase`, `naturalPowMod`, `naturalSizeInBase`, `naturalToFloat`, and `naturalToDouble`, as they are apparently nowhere used in GHC’s source code. - - - - - 424388c2 by Wolfgang Jeltsch at 2025-12-21T16:24:45-05:00 Remove the unused known key and name for `Fingerprint` This removes the variables for the known key and the name of the `Fingerprint` data constructor, as they are apparently nowhere used in GHC’s source code. - - - - - a1ed86fe by Wolfgang Jeltsch at 2025-12-21T16:25:26-05:00 Remove the unused known key and name for `failIO` This removes the variables for the known key and the name of the `failIO` operation, as they are apparently nowhere used in GHC’s source code. - - - - - b8220daf by Wolfgang Jeltsch at 2025-12-21T16:26:07-05:00 Remove the unused known key and name for `liftM` This removes the variables for the known key and the name of the `liftM` operation, as they are apparently nowhere used in GHC’s source code. - - - - - eb0628b1 by Wolfgang Jeltsch at 2025-12-21T16:26:47-05:00 Fix the documentation of `hIsClosed` - - - - - db1ce858 by sheaf at 2025-12-22T17:11:17-05:00 Do deep subsumption when computing valid hole fits This commit makes a couple of improvements to the code that computes "valid hole fits": 1. It uses deep subsumption for data constructors. This matches up the multiplicities, as per Note [Typechecking data constructors]. This fixes #26338 (test: LinearHoleFits). 2. It now suggests (non-unidirectional) pattern synonyms as valid hole fits. This fixes #26339 (test: PatSynHoleFit). 3. It uses 'stableNameCmp', to make the hole fit output deterministic. ------------------------- Metric Increase: hard_hole_fits ------------------------- - - - - - 72ee9100 by sheaf at 2025-12-22T17:11:17-05:00 Speed up hole fits with a quick pre-test This speeds up the machinery for valid hole fits by doing a small check to rule out obviously wrong hole fits, such as: 1. A hole fit identifier whose type has a different TyCon at the head, after looking through foralls and (=>) arrows, e.g.: hole_ty = Int cand_ty = Maybe a or hole_ty = forall a b. a -> b cand_ty = forall x y. Either x y 2. A hole fit identifier that is not polymorphic when the hole type is polymorphic, e.g. hole_ty = forall a. a -> a cand_ty = Int -> Int ------------------------- Metric Decrease: hard_hole_fits ------------------------- - - - - - 30e513ba by Cheng Shao at 2025-12-22T17:12:00-05:00 configure: remove unused win32-tarballs.md5sum This patch removes the unused `win32-tarballs.md5sum` file from the tree. The current mingw tarball download logic in `mk/get-win32-tarballs.py` fetches and checks against `SHA256SUM` from the same location where the tarballs are fetched, and this file has been unused for a few years. - - - - - a2d52b3b by Wolfgang Jeltsch at 2025-12-23T04:47:33-05:00 Add an operation `System.IO.hGetNewlineMode` This commit also contains some small code and documentation changes for related operations, for the sake of consistency. - - - - - b26d134a by Cheng Shao at 2025-12-23T04:48:15-05:00 rts: opportunistically reclaim slop space in shrinkMutableByteArray# Previously, `shrinkMutableByteArray#` shrinks a `MutableByteArray#` in-place by assigning the new size to it, and zeroing the extra slop space. That slop space is not reclaimed and wasted. But it's often the case that we allocate a `MutableByteArray#` upfront, then shrink it shortly after, so the `MutableByteArray#` closure sits right at the end of a nursery block; this patch identifies such chances, and also shrink `bd->free` if possible, reducing heap space fragmentation. Co-authored-by: Codex <codex(a)openai.com> ------------------------- Metric Decrease: T10678 ------------------------- - - - - - 7adfc305 by Simon Peyton Jones at 2025-12-23T16:12:13+00:00 Fix evaluated-ness bug in Simplifier This fixes #26548, an error which meant that we were failing to attach evaluated-ness flags to case-alternative-bound variables - - - - - e85830e9 by Simon Peyton Jones at 2025-12-23T16:12:13+00:00 Be a little less eager to inline - - - - - 9c20da08 by Simon Peyton Jones at 2025-12-23T16:12:13+00:00 Try making Reduction strict in its Coercion Just an experiment. The comment says -- N.B. the 'Coercion' field must be lazy: see for instance -- GHC.Tc.Solver.Rewrite.rewrite_tyvar2 which returns an error in the 'Coercion' -- field when dealing with a Derived constraint (which is OK as this Coercion -- gets ignored later). We might want to revisit the strictness once Deriveds -- are removed. But Deriveds are in the rear view mirror. - - - - - 32c83fbc by Simon Peyton Jones at 2025-12-23T16:12:13+00:00 Revert making Reduction stricter It makes things slightly worse I think. - - - - - fbac7479 by Simon Peyton Jones at 2025-12-23T16:12:13+00:00 Make inlining a tiny bit more eager In particular x = mkSymMCo mco where mco is evaluated. We want that to inline, especially if the let is strict. Makes a significant difference in Rewrite.hs, Test case T9872b - - - - - 6ea53e25 by Simon Peyton Jones at 2025-12-23T16:12:13+00:00 OtherCon [] arguments aren't interesting - - - - - 824 changed files: - .gitattributes - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - .gitlab/test-metrics.sh - compile_flags.txt - compiler/GHC.hs - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - compiler/GHC/Builtin/Types/Literals.hs - compiler/GHC/Builtin/Utils.hs - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Linker.hs - compiler/GHC/ByteCode/Serialize.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm.hs - compiler/GHC/Cmm/BlockId.hs - compiler/GHC/Cmm/CLabel.hs - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/Cmm/Config.hs - compiler/GHC/Cmm/ContFlowOpt.hs - compiler/GHC/Cmm/Dataflow.hs - compiler/GHC/Cmm/Dataflow/Block.hs - compiler/GHC/Cmm/Dataflow/Graph.hs - compiler/GHC/Cmm/Dataflow/Label.hs - compiler/GHC/Cmm/DebugBlock.hs - compiler/GHC/Cmm/Dominators.hs - compiler/GHC/Cmm/Expr.hs - compiler/GHC/Cmm/Graph.hs - compiler/GHC/Cmm/Info/Build.hs - compiler/GHC/Cmm/LRegSet.hs - compiler/GHC/Cmm/LayoutStack.hs - compiler/GHC/Cmm/Lint.hs - compiler/GHC/Cmm/Liveness.hs - compiler/GHC/Cmm/MachOp.hs - compiler/GHC/Cmm/Node.hs - compiler/GHC/Cmm/Opt.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/Cmm/ProcPoint.hs - compiler/GHC/Cmm/Reducibility.hs - compiler/GHC/Cmm/Reg.hs - compiler/GHC/Cmm/Sink.hs - compiler/GHC/Cmm/Switch.hs - compiler/GHC/Cmm/Switch/Implement.hs - compiler/GHC/Cmm/ThreadSanitizer.hs - compiler/GHC/Cmm/UniqueRenamer.hs - compiler/GHC/Cmm/Utils.hs - compiler/GHC/CmmToAsm/AArch64/Ppr.hs - compiler/GHC/CmmToAsm/AArch64/RegInfo.hs - compiler/GHC/CmmToAsm/BlockLayout.hs - 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utils/haddock/html-test/ref/TypeOperators.html - utils/haddock/html-test/ref/Unicode.html - utils/haddock/html-test/ref/Unicode2.html - + utils/haddock/html-test/src/PatternSyns2.hs - utils/haddock/latex-test/ref/LinearTypes/LinearTypes.tex - utils/hpc - utils/hsc2hs - utils/iserv/iserv.cabal.in The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d519d2bc8ac77c0e3bd53ffc8d54c5… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d519d2bc8ac77c0e3bd53ffc8d54c5… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/fix-26670] 3 commits: Add an operation `System.IO.hGetNewlineMode`
by recursion-ninja (＠recursion-ninja) 23 Dec '25

23 Dec '25

recursion-ninja pushed to branch wip/fix-26670 at Glasgow Haskell Compiler / GHC Commits: a2d52b3b by Wolfgang Jeltsch at 2025-12-23T04:47:33-05:00 Add an operation `System.IO.hGetNewlineMode` This commit also contains some small code and documentation changes for related operations, for the sake of consistency. - - - - - b26d134a by Cheng Shao at 2025-12-23T04:48:15-05:00 rts: opportunistically reclaim slop space in shrinkMutableByteArray# Previously, `shrinkMutableByteArray#` shrinks a `MutableByteArray#` in-place by assigning the new size to it, and zeroing the extra slop space. That slop space is not reclaimed and wasted. But it's often the case that we allocate a `MutableByteArray#` upfront, then shrink it shortly after, so the `MutableByteArray#` closure sits right at the end of a nursery block; this patch identifies such chances, and also shrink `bd->free` if possible, reducing heap space fragmentation. Co-authored-by: Codex <codex(a)openai.com> ------------------------- Metric Decrease: T10678 ------------------------- - - - - - a671ee5c by Recursion Ninja at 2025-12-23T11:09:10-05:00 Decoupling Language.Haskell.Syntax.Binds from GHC.Types.Basic by transfering InlinePragma types between the modules. * Moved InlinePragma data-types to Language.Haskell.Syntax.Binds.InlinePragma * Partitioned of Arity type synonyms to GHC.Types.Arity * InlinePragma is now extensible via Trees That Grow * Activation is now extensible via Trees That Grow * Maybe Arity change to more descriptive InlineSaturation data-type * InlineSaturation information removed from InlinePragma during GHS parsing pass * Cleaned up the exposed module interfaces of the new modules - - - - - 73 changed files: - compiler/GHC/Builtin/PrimOps/Ids.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Opt/CSE.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/Pipeline.hs - compiler/GHC/Core/Opt/Pipeline/Types.hs - compiler/GHC/Core/Opt/Simplify.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/Simplify/Utils.hs - compiler/GHC/Core/Opt/SpecConstr.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/Unfold/Make.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/Driver/Config/Core/Lint.hs - compiler/GHC/Driver/Config/Core/Opt/Simplify.hs - compiler/GHC/Hs/Binds.hs - + compiler/GHC/Hs/Extension.hs-boot - compiler/GHC/Hs/Instances.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Errors/Types.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Foreign/JavaScript.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/Iface/Make.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Lexer.x - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Rename/Bind.hs - compiler/GHC/Tc/Deriv/Generics.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/Arrow.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Instance/Typeable.hs - compiler/GHC/Tc/TyCl/Instance.hs - compiler/GHC/Tc/Utils/Instantiate.hs - compiler/GHC/ThToHs.hs - + compiler/GHC/Types/Arity.hs - compiler/GHC/Types/Basic.hs - compiler/GHC/Types/Hint.hs - compiler/GHC/Types/Id.hs - compiler/GHC/Types/Id/Info.hs - compiler/GHC/Types/Id/Make.hs - + compiler/GHC/Types/InlinePragma.hs - compiler/GHC/Utils/Binary.hs - compiler/GHC/Utils/Outputable.hs - compiler/Language/Haskell/Syntax/Binds.hs - + compiler/Language/Haskell/Syntax/Binds/InlinePragma.hs - compiler/Language/Haskell/Syntax/Decls.hs - compiler/Language/Haskell/Syntax/Extension.hs - compiler/ghc.cabal.in - libraries/base/changelog.md - libraries/base/src/System/IO.hs - libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs - libraries/ghc-internal/src/GHC/Internal/System/IO.hs - rts/PrimOps.cmm - testsuite/tests/interface-stability/base-exports.stdout - testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs - testsuite/tests/interface-stability/base-exports.stdout-mingw32 - testsuite/tests/interface-stability/base-exports.stdout-ws-32 - utils/deriveConstants/Main.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/16b3dfb9d2da4975e435cbdb6e0c24… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/16b3dfb9d2da4975e435cbdb6e0c24… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T26548] OtherCon [] arguments aren't interesting
by Simon Peyton Jones (＠simonpj) 23 Dec '25

23 Dec '25

Simon Peyton Jones pushed to branch wip/T26548 at Glasgow Haskell Compiler / GHC Commits: d519d2bc by Simon Peyton Jones at 2025-12-23T16:08:44+00:00 OtherCon [] arguments aren't interesting - - - - - 1 changed file: - compiler/GHC/Core/Opt/Simplify/Utils.hs Changes: ===================================== compiler/GHC/Core/Opt/Simplify/Utils.hs ===================================== @@ -1032,7 +1032,7 @@ interestingArg env e = go env 0 e | n > 0 = NonTrivArg -- Saturated or unknown call | otherwise -- n==0, no value arguments; look for an interesting unfolding = case idUnfolding v of --- OtherCon [] -> NonTrivArg -- It's evaluated, but that's all we know + OtherCon [] -> TrivArg -- It's evaluated, but that's all we know OtherCon _ -> NonTrivArg -- Evaluated and we know it isn't these constructors -- See Note [OtherCon and interestingArg] DFunUnfolding {} -> ValueArg -- We konw that idArity=0 @@ -1046,13 +1046,16 @@ interestingArg env e = go env 0 e {- Note [OtherCon and interestingArg] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ interstingArg returns - (a) NonTrivArg for an arg with an OtherCon [] unfolding - (b) ValueArg for an arg with an OtherCon [c1,c2..] unfolding. + (a) TrivArg for an arg with an OtherCon [] unfolding + (b) NonTrivArg for an arg with an OtherCon [c1,c2..] unfolding. -Reason for (a): I found (in the GHC.Internal.Bignum.Integer module) that I was -inlining a pretty big function when all we knew was that its arguments -were evaluated, nothing more. That in turn make the enclosing function -too big to inline elsewhere. +Reason for (a): + I found (in the GHC.Internal.Bignum.Integer module) that I was + inlining a pretty big function when all we knew was that its arguments + were evaluated, nothing more. That in turn make the enclosing function + too big to inline elsewhere. + + Reason for (b): we want to inline integerCompare here integerLt# :: Integer -> Integer -> Bool# View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d519d2bc8ac77c0e3bd53ffc8d54c5a… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d519d2bc8ac77c0e3bd53ffc8d54c5a… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/26416] DmdAnal: Don't give an absent demand signature to an argument if the argument doesn't
by Zubin (＠wz1000) 23 Dec '25

23 Dec '25

Zubin pushed to branch wip/26416 at Glasgow Haskell Compiler / GHC Commits: 5ffe38ea by Zubin Duggal at 2025-12-23T19:37:01+05:30 DmdAnal: Don't give an absent demand signature to an argument if the argument doesn't also have an absent demand signature in its unfolding. Otherwise, in some cases we might mark an argument as absent and generate a LitRubbish for it, but then the function might inline and turn out to actually use this argument, resulting in a run time crash. Partially addresses #26416. There may still be cases where an absent argument turns out to be used due to a rule firing. - - - - - 3 changed files: - compiler/GHC/Core/Opt/DmdAnal.hs - + testsuite/tests/dmdanal/should_run/M1.hs - + testsuite/tests/dmdanal/should_run/T26416.hs Changes: ===================================== compiler/GHC/Core/Opt/DmdAnal.hs ===================================== @@ -1106,8 +1106,17 @@ dmdAnalRhsSig top_lvl rec_flag env let_sd id rhs WithDmdType rhs_dmd_ty rhs' = dmdAnal env rhs_sd rhs DmdType rhs_env rhs_dmds = rhs_dmd_ty + + -- See Note [Absence analysis for stable unfoldings and RULES] + -- If there's a stable unfolding, we need to combine argument demands + -- from the unfolding with those from the RHS, because the unfolding + -- might use arguments that the (optimised) RHS doesn't. + -- Any argument with a demand absent in one but not the other can + -- be problematic, see #26416 + combined_rhs_dmds = combineUnfoldingDmds env rhs_sd id rhs_dmds + (final_rhs_dmds, final_rhs) = finaliseArgBoxities env id ww_arity - rhs_dmds (de_div rhs_env) rhs' + combined_rhs_dmds (de_div rhs_env) rhs' dmd_sig_arity = ww_arity + strictCallArity body_sd sig = mkDmdSigForArity dmd_sig_arity (DmdType sig_env final_rhs_dmds) @@ -1144,6 +1153,27 @@ splitWeakDmds :: DmdEnv -> (DmdEnv, WeakDmds) splitWeakDmds (DE fvs div) = (DE sig_fvs div, weak_fvs) where (!weak_fvs, !sig_fvs) = partitionVarEnv isWeakDmd fvs +-- | If there is a stable unfolding, don't let any demand be absent that +-- is also not absent in the unfolding +-- See Note [Absence analysis for stable unfoldings and RULES], Wrinkle (W3). +combineUnfoldingDmds :: AnalEnv -> SubDemand -> Id -> [Demand] -> [Demand] +combineUnfoldingDmds env rhs_sd id rhs_dmds + | not (isStableUnfolding unf) + = rhs_dmds -- No stable unfolding, nothing to do + + | Just unf_body <- maybeUnfoldingTemplate unf + , let WithDmdType (DmdType _ unf_dmds) _ = dmdAnal env rhs_sd unf_body + , let result = go rhs_dmds unf_dmds + = -- pprTrace "lubUnfoldingDmds" (ppr id $$ ppr rhs_dmds $$ ppr unf_dmds $$ ppr result) $ + result + | otherwise = rhs_dmds + where + unf = realIdUnfolding id + go rhs [] = rhs + go [] _ = [] + go (AbsDmd:rhs) (u:unfs) = u : go rhs unfs + go (r:rhs) (AbsDmd:unfs) = r : go rhs unfs + -- | The result type after applying 'idArity' many arguments. Returns 'Nothing' -- when the type doesn't have exactly 'idArity' many arrows. resultType_maybe :: Id -> Maybe Type @@ -1523,6 +1553,25 @@ Wrinkles: for `sg`, failing to unleash the signature and hence observed an absent error instead of the `really important message`. + (W3) The SOLUTION above handles /free variables/ of stable unfoldings, but + what about /arguments/? Consider (#25965) + + fromVector :: (Storable a, KnownNat n) => Vector a -> Vector a + fromVector v = ... (uses Storable dictionary) ... + {-# INLINABLE fromVector #-} + + Suppose that the optimised RHS of `fromVector` somehow discards the use of + the Storable dictionary, but the stable unfolding still uses it. Then the + demand signature will say that the Storable dictionary argument is absent, + and worker/wrapper will replace it with `LitRubbish`. But when the + worker's unfolding is inlined, it will use that rubbish value as a real + dictionary, leading to a segfault! + + SOLUTION: in `dmdAnalRhsSig`, if the function has a stable unfolding, + analyse it and drop any AbsDmds which are not absent in the unfolding. + This is done by `combineUnfoldingDmds`. This ensures that if the unfolding + uses an argument, it won't be marked as absent. + Note [DmdAnal for DataCon wrappers] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We give DataCon wrappers a (necessarily flat) demand signature in @@ -2046,8 +2095,11 @@ finaliseArgBoxities env fn ww_arity arg_dmds div rhs arg_triples :: [(Type, StrictnessMark, Demand)] arg_triples = take ww_arity $ - [ (idType bndr, NotMarkedStrict, get_dmd bndr) - | bndr <- bndrs, isRuntimeVar bndr ] + zipWith mk_triple + [ bndr | bndr <- bndrs, isRuntimeVar bndr ] + arg_dmds + where + mk_triple bndr dmd = (idType bndr, NotMarkedStrict, get_dmd dmd) arg_dmds' = ww_arg_dmds ++ map trimBoxity (drop ww_arity arg_dmds) -- If ww_arity < length arg_dmds, the leftover ones @@ -2063,12 +2115,10 @@ finaliseArgBoxities env fn ww_arity arg_dmds div rhs -- This is the budget initialisation step of -- Note [Worker argument budget] - get_dmd :: Id -> Demand - get_dmd bndr + get_dmd :: Demand -> Demand + get_dmd dmd | is_bot_fn = unboxDeeplyDmd dmd -- See Note [Boxity for bottoming functions], | otherwise = dmd -- case (B) - where - dmd = idDemandInfo bndr -- is_bot_fn: see Note [Boxity for bottoming functions] is_bot_fn = div == botDiv ===================================== testsuite/tests/dmdanal/should_run/M1.hs ===================================== @@ -0,0 +1,17 @@ +-- Short module name is essential, or else f doesn't inline +module M1 where +{-# INLINABLE [2] f #-} +f :: Int -> Int -> Float +f !dummy x = if times dummy 0 x == 1 + then 3.0 else 4.0 + +{-# INLINE [0] times #-} +times :: Int -> Int -> Int -> Int +times dummy 0 x = x `seq` ( 0 + big dummy ) +times _ a b = a * b + +{-# RULES "times" [1] forall dummy x. times dummy 0 x = 0 + big dummy #-} + +big :: Int -> Int +big x = succ . succ . succ . succ . succ . succ . succ . succ . succ $ x +{-# INLINE big #-} ===================================== testsuite/tests/dmdanal/should_run/T26416.hs ===================================== @@ -0,0 +1,3 @@ +module Main where +import M1 ( f ) +main = print (f 19 12) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5ffe38ea0aff503692172421aa82ff9… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5ffe38ea0aff503692172421aa82ff9… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Pushed new branch wip/26416
by Zubin (＠wz1000) 23 Dec '25

23 Dec '25

Zubin pushed new branch wip/26416 at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/26416 You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Pushed new branch wip/mp/9.10.1-memory-backports
by Matthew Pickering (＠mpickering) 23 Dec '25

23 Dec '25

Matthew Pickering pushed new branch wip/mp/9.10.1-memory-backports at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/mp/9.10.1-memory-backports You're receiving this email because of your account on gitlab.haskell.org.

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