Torsten Schmits pushed to branch wip/torsten.schmits/mwb-26-01/fixed at Glasgow Haskell Compiler / GHC Commits: 09d92280 by Ben Gamari at 2024-03-12T10:14:28-04:00 rts/linker: Don't unload code when profiling is enabled The heap census may contain references (e.g. `Counter.identity`) to static data which must be available when the census is reported at the end of execution. Fixes #24512. - - - - - a27a477d by Ben Gamari at 2024-03-12T10:14:28-04:00 rts/linker: Don't unload native objects when dlinfo isn't available To do so is unsafe as we have no way of identifying references to symbols provided by the object. Fixes #24513. Fixes #23993. - - - - - 63928aeb by Ben Gamari at 2024-03-12T10:14:28-04:00 rel_eng/upload: Purge both $rel_name/ and $ver/ This is necessary for prereleases, where GHCup accesses the release via `$ver/` - - - - - 2e713fdb by Ben Gamari at 2024-03-12T10:14:28-04:00 gitlab-ci: Allow test-primops to fail It's still a bit sensitive to warnings, unfortunately. - - - - - 66c51e75 by Ben Gamari at 2024-03-12T10:14:28-04:00 hadrian: Package mingw toolchain in expected location This fixes #24525, a regression due to 41cbaf44a6ab5eb9fa676d65d32df8377898dc89. Specifically, GHC expects to find the mingw32 toolchain in the binary distribution root. However, after this patch it was packaged in the `lib/` directory. - - - - - d574a10d by Ben Gamari at 2024-03-12T10:14:28-04:00 hadrian/bindist: Eliminate extraneous `dirname` invocation Previously we would call `dirname` twice per installed library file. We now instead reuse this result. This helps appreciably on Windows, where processes are quite expensive. - - - - - 9f85900d by Ben Gamari at 2024-03-13T08:59:50-04:00 mk/relpath: Fix quoting Previously there were two instances in this script which lacked proper quoting. This resulted in `relpath` invocations in the binary distribution Makefile producing incorrect results on Windows, leading to confusing failures from `sed` and the production of empty package registrations. Fixes #24538. - - - - - 47272633 by Ben Gamari at 2024-03-13T18:21:37-04:00 docs: Drop old release notes - - - - - db8a17a0 by Ben Gamari at 2024-03-13T18:33:12-04:00 gitlab/rel_eng: More upload.sh tweaks - - - - - b55e0ef9 by Ben Gamari at 2024-03-13T18:33:17-04:00 rel_eng: Drop dead prepare_docs codepath - - - - - 548da279 by Ben Gamari at 2024-03-14T09:13:15-04:00 rel_env/recompress_all: Decompress xz before recompressing Previously we would rather compress the xz *again*, before in addition compressing it with the desired scheme. Fixes #24545. - - - - - cf814fe9 by Teo Camarasu at 2024-03-21T11:44:15-04:00 Add preamble to 9.10 release notes Resolves #24567 - - - - - b09cbad8 by Zubin Duggal at 2024-03-25T12:21:37-04:00 Revert "Apply shellcheck suggestion to SUBST_TOOLDIR" This reverts commit c82770f57977a2b5add6e1378f234f8dd6153392. The shellcheck suggestion is spurious and results in SUBST_TOOLDIR being a no-op. `set` sets positional arguments for bash, but we want to set the variable given as the first autoconf argument. Fixes #24542 Metric decreases because the paths in the settings file are now shorter, so we allocate less when we read the settings file. ------------------------- Metric Decrease: T12425 T13035 T9198 ------------------------- (cherry picked from commit 576f8b7ec292382aaa47fceab504b5abf4cc1f8a) - - - - - 0d4ee209 by Andrei Borzenkov at 2024-03-25T12:27:07-04:00 Fix compiler crash caused by implicit RHS quantification in type synonyms (#24470) (cherry picked from commit 7ea971d314c4eba59e12e94bf3eb8edb95fbfac5) - - - - - 688cb2ff by Cheng Shao at 2024-03-25T12:28:00-04:00 Revert "compiler: make genSym use C-based atomic increment on non-JS 32-bit platforms" This reverts commit 615eb855416ce536e02ed935ecc5a6f25519ae16. It was originally intended to fix #24449, but it was merely sweeping the bug under the rug. 3836a110577b5c9343915fd96c1b2c64217e0082 has properly fixed the fragile test, and we no longer need the C version of genSym. Furthermore, the C implementation causes trouble when compiling with clang that targets i386 due to alignment warning and libatomic linking issue, so it makes sense to revert it. (cherry picked from commit 39f3ac3e1b47e9fdac8fcf2d1edcc300a37deb82) - - - - - c5c19c14 by Cheng Shao at 2024-03-25T12:28:01-04:00 compiler: fix out-of-bound memory access of genSym on 32-bit This commit fixes an unnoticed out-of-bound memory access of genSym on 32-bit. ghc_unique_inc is 32-bit sized/aligned on 32-bit platforms, but we mistakenly treat it as a Word64 pointer in genSym, and therefore will accidentally load 2 garbage higher bytes, or with a small but non-zero chance, overwrite something else in the data section depends on how the linker places the data segments. This regression was introduced in !11802 and fixed here. (cherry picked from commit e6bfb85c842edca36754bb8914e725fbaa1a83a6) - - - - - 67defa84 by Alan Zimmerman at 2024-03-25T12:28:15-04:00 EPA: Fix regression discarding comments in contexts Closes #24533 (cherry picked from commit 7da7f8f643f1bfc4aa034a731f2f85cda007b286) - - - - - 97afcca5 by Alan Zimmerman at 2024-03-25T12:28:31-04:00 EPA: Address more 9.10.1-alpha1 regressions from recent changes Closes #24533 Hopefully for good this time (cherry picked from commit bd8209eb8e447a5ae1d736f034f4a3986e0727f7) - - - - - 850fc30e by Alan Zimmerman at 2024-03-25T12:28:48-04:00 EPA: Clean up Exactprint helper functions a bit - Introduce a helper lens to compose on `EpAnn a` vs `a` versions - Rename some prime versions of functions back to non-prime They were renamed during the rework (cherry picked from commit 5f27517687c711593a23f1c9e5bd09ad9ec22fa4) - - - - - 01a6a717 by Vladislav Zavialov at 2024-03-25T12:29:02-04:00 Type operators in promoteOccName (#24570) Type operators differ from term operators in that they are lexically classified as (type) constructors, not as (type) variables. Prior to this change, promoteOccName did not account for this difference, causing a scoping issue that affected RequiredTypeArguments. type (!@#) = Bool f = idee (!@#) -- Not in scope: ‘!@#’ (BUG) Now we have a special case in promoteOccName to account for this. (cherry picked from commit da2a10ceab7498fbbd5723dee0393ce75f2bb562) - - - - - e5b111e9 by Simon Peyton Jones at 2024-03-25T12:29:15-04:00 Expand untyped splices in tcPolyExprCheck Fixes #24559 (cherry picked from commit 97a2bb1cdfa4b244a58374658aec6d48ce23a54a) - - - - - 222a5240 by Andrei Borzenkov at 2024-03-25T12:29:27-04:00 Fix TH handling in `pat_to_type_pat` function (#24571) There was missing case for `SplicePat` in `pat_to_type_at` function, hence patterns with splicing that checked against `forall->` doesn't work properly because they fall into the "illegal pattern" case. Code example that is now accepted: g :: forall a -> () g $([p| a |]) = () (cherry picked from commit 6fafc51e9206abd62881131c282ec3b9e1584c5b) - - - - - c394cfa7 by Ben Gamari at 2024-03-26T13:46:41-04:00 Bump haddock submodule Fixes #24485 by fixing the default hyperlinked sources URL pattern. - - - - - 337a5073 by Ben Gamari at 2024-03-26T19:53:32-04:00 Add build ordering edge for GHC.IO.Encoding.Iconv - - - - - 6f4b0335 by Ben Gamari at 2024-03-26T21:32:47-04:00 mk-ghcup-metadata: Fix directory of testsuite tarball As reported in #24546, the `dlTest` artifact should be extracted into the `testsuite` directory. (cherry picked from commit 9d936c5799daadf96392211b03e38520925aea17) - - - - - 878e8529 by Ben Gamari at 2024-03-26T21:32:49-04:00 ghcup-metadata: Don't populate dlOutput unless necessary ghcup can apparently infer the output name of an artifact from its URL. Consequently, we should only include the `dlOutput` field when it would differ from the filename of `dlUri`. Fixes #24547. (cherry picked from commit 6d398066b6084a971248da8ce37bc40c53a83525) - - - - - 725343aa by Rodrigo Mesquita at 2024-03-26T22:34:19-04:00 bindist: Clean xattrs of bin and lib at configure time For issue #21506, we started cleaning the extended attributes of binaries and libraries from the bindist *after* they were installed to workaround notarisation (#17418), as part of `make install`. However, the `ghc-toolchain` binary that is now shipped with the bindist must be run at `./configure` time. Since we only cleaned the xattributes of the binaries and libs after they were installed, in some situations users would be unable to run `ghc-toolchain` from the bindist, failing at configure time (#24554). In this commit we move the xattr cleaning logic to the configure script. Fixes #24554 (cherry picked from commit bf65a7c388b399b7b3c6b97f25d97164390b75f1) - - - - - 5dd67b52 by Alan Zimmerman at 2024-03-27T08:37:54-04:00 EPA: Do not extend declaration range for trailine zero len semi The lexer inserts virtual semicolons having zero width. Do not use them to extend the list span of items in a list. (cherry picked from commit 0acfe391583d77a72051d505f05fab0ada056c49) - - - - - 10829530 by Rodrigo Mesquita at 2024-03-27T08:38:20-04:00 configure: Use LDFLAGS when trying linkers A user may configure `LDFLAGS` but not `LD`. When choosing a linker, we will prefer `ldd`, then `ld.gold`, then `ld.bfd` -- however, we have to check for a working linker. If either of these fail, we try the next in line. However, we were not considering the `$LDFLAGS` when checking if these linkers worked. So we would pick a linker that does not support the current $LDFLAGS and fail further down the line when we used that linker with those flags. Fixes #24565, where `LDFLAGS=-Wl,-z,pack-relative-relocs` is not supported by `ld.gold` but that was being picked still. (cherry picked from commit 32a8103f3b3e22907fdd67b69c919c5251d8cc20) - - - - - 3914808d by Cheng Shao at 2024-03-27T08:38:35-04:00 libffi-tarballs: bump libffi-tarballs submodule to libffi 3.4.6 This commit bumps the libffi-tarballs submodule to libffi 3.4.6, which includes numerous upstream libffi fixes, especially https://github.com/libffi/libffi/issues/760. (cherry picked from commit 810660b780e1111b36c91326bcd0041e1f62706b) - - - - - 6ecd5f2f by Cheng Shao at 2024-03-27T08:38:49-04:00 rts: fix clang compilation on aarch64 This patch fixes function prototypes in ARMOutlineAtomicsSymbols.h which causes "error: address argument to atomic operation must be a pointer to _Atomic type" when compiling with clang on aarch64. (cherry picked from commit 7db8c9927fae3369fc4ecff68f80c4cb32eea757) - - - - - a17965fc by Alan Zimmerman at 2024-03-28T15:50:35-04:00 EPA: Fix FamDecl range The span was incorrect if opt_datafam_kind_sig was empty - - - - - 89dee1d6 by Alan Zimmerman at 2024-03-28T15:50:39-04:00 EPA: do not duplicate comments in signature RHS (cherry picked from commit d2ba41e8c3e71d70a0f80dcc3f588ecbdc5ce4b2) - - - - - 7d9c2102 by Ben Gamari at 2024-03-28T15:50:56-04:00 compiler: Allow more types in GHCForeignImportPrim For many, many years `GHCForeignImportPrim` has suffered from the rather restrictive limitation of not allowing any non-trivial types in arguments or results. This limitation was justified by the code generator allegely barfing in the presence of such types. However, this restriction appears to originate well before the NCG rewrite and the new NCG does not appear to have any trouble with such types (see the added `T24598` test). Lift this restriction. Fixes #24598. - - - - - 16e1fca2 by Ben Gamari at 2024-03-28T15:51:22-04:00 Fix type of _get_osfhandle foreign import Fixes #24601. - - - - - 76a0e7f6 by Ben Gamari at 2024-03-29T17:02:25-04:00 Bump parsec submodule to 3.1.17.0 - - - - - 5a85e5b1 by Ben Gamari at 2024-04-04T14:24:55-04:00 Bump Cabal submodule to current state of 3.12 branch - - - - - 0fb5c97d by Ben Gamari at 2024-04-08T13:36:25-04:00 base: Deprecate GHC.Pack See #21461. - - - - - 834fe22d by Apoorv Ingle at 2024-04-09T21:17:38-04:00 Fix for #24552 (see testcase T24552) Fixes for a bug in desugaring pattern synonyms matches, introduced while working on on expanding `do`-blocks in #18324 The `matchWrapper` unecessarily (and incorrectly) filtered out the default wild patterns in a match. Now the wild pattern alternative is simply ignored by the pm check as its origin is `Generated`. The current code now matches the expected semantics according to the language spec. (cherry picked from commit 0c48f2b952ad4ee995e4eafa458b7a8d3c442415) - - - - - 76a0f8f2 by Ben Gamari at 2024-04-11T00:07:21-04:00 Bump process submodule to 1.6.19.0 Addresses Windows command-line injection vulnerability. - - - - - 086698ba by Ben Gamari at 2024-04-11T00:07:21-04:00 Bump unix submodule to 2.8.5.1 Closes #24640. - - - - - 21c9c1bc by Ben Gamari at 2024-04-11T00:07:21-04:00 ghcup-metadata: Use Debian 9 binaries on Ubuntu 16, 17 Closes #24646. - - - - - aa5b34e1 by Ben Gamari at 2024-04-11T00:07:21-04:00 Bump stm submodule Fixing #24643 - - - - - 8212c3c6 by Alan Zimmerman at 2024-04-11T09:32:07-04:00 EPA: Remove unnecessary XRec in CompleteMatchSig The XRec for [LIdP pass] is not needed for exact printing, remove it. (cherry picked from commit 1b1a92bd25c3f7249cf922c5dbf4415d2de44a36) - - - - - 6b480460 by Sebastian Graf at 2024-04-11T09:32:18-04:00 Simplifier: Re-do dependency analysis in abstractFloats (#24551) In #24551, we abstracted a string literal binding over a type variable, triggering a CoreLint error when that binding floated to top-level. The solution implemented in this patch fixes this by re-doing dependency analysis on a simplified recursive let binding that is about to be type abstracted, in order to find the minimal set of type variables to abstract over. See wrinkle (AB5) of Note [Floating and type abstraction] for more details. Fixes #24551 (cherry picked from commit 3e0b2b1f14e5e82eaa1dc6fbf8dceb5f539f5aa3) - - - - - ca9bb80e by Rodrigo Mesquita at 2024-04-11T09:32:41-04:00 th: Hide the Language.Haskell.TH.Lib.Internal module from haddock Fixes #24562 (cherry picked from commit 817e89362e74b5177c02deee31f16cec862052cc) - - - - - a13e9b69 by Matthew Pickering at 2024-04-11T09:32:49-04:00 Fix off by one error in seekBinNoExpand and seekBin (cherry picked from commit 28009fbc26e4aca7a3b05cedb60c5c9baa31223d) - - - - - 770dcce2 by Andrei Borzenkov at 2024-04-11T09:33:40-04:00 Change how invisible patterns represented in haskell syntax and TH AST (#24557) Before this patch: data ArgPat p = InvisPat (LHsType p) | VisPat (LPat p) With this patch: data Pat p = ... | InvisPat (LHsType p) ... And the same transformation in the TH land. The rest of the changes is just updating code to handle new AST and writing tests to check if it is possible to create invalid states using TH. Metric Increase: MultiLayerModulesTH_OneShot (cherry picked from commit 36a75b80ebe592f582f3f349e8c73b8293d49ed1) - - - - - 03bfe160 by Alan Zimmerman at 2024-04-11T09:33:53-04:00 EPA: Capture all comments in a ClassDecl Hopefully the final fix needed for #24533 (cherry picked from commit be3bdddebdf119007d753bebe32709a1ce726cc0) - - - - - eca47e5b by Alan Zimmerman at 2024-04-11T09:34:02-04:00 EPA: Use EpaLocation in WarningTxt This allows us to use an EpDelta if needed when using makeDeltaAst. (cherry picked from commit 3b7b0c1c1337fe4cf470987d891f1f3944840688) - - - - - 6ce42495 by Sylvain Henry at 2024-04-11T14:06:46-04:00 JS: reenable h$appendToHsString optimization (#24495) The optimization introducing h$appendToHsString wasn't kicking in anymore (while it did in 9.8.1) because of the changes introduced in #23270 (7e0c8b3bab30). This patch reenables the optimization by matching on case-expression, as done in Cmm for unpackCString# standard thunks. The test is also T24495 added in the next commits (two commits for ease of backporting to 9.8). (cherry picked from commit b36ee57bfbecc628b7f0919e1e59b7066495034f) - - - - - cc690f6e by Sylvain Henry at 2024-04-11T14:06:46-04:00 JS: fix h$appendToHsString implementation (#24495) h$appendToHsString needs to wrap its argument in an updatable thunk to behave like unpackAppendCString#. Otherwise if a SingleEntry thunk is passed, it is stored as-is in a CONS cell, making the resulting list impossible to deepseq (forcing the thunk doesn't update the contents of the CONS cell)! The added test checks that the optimization kicks in and that h$appendToHsString works as intended. Fix #24495 (cherry picked from commit 527616e950fd8942c182be903d176f4b9890ee5a) - - - - - 656395ec by Luite Stegeman at 2024-04-11T14:06:46-04:00 Update correct counter in bumpTickyAllocd (cherry picked from commit 0c4a96862081f03e2946a2ed7e80c108f06205a1) - - - - - fb7dfdf0 by Ben Gamari at 2024-04-11T14:06:46-04:00 testsuite: Fix T24598 with unregisterised compiler (cherry picked from commit 9b9e031b67dbc812c156a4773c0c9d293451fefa) - - - - - 0dd8f0bc by Alan Zimmerman at 2024-04-11T14:06:46-04:00 EPA: Use EpaLocation not SrcSpan in ForeignDecls This allows us to update them for makeDeltaAst in ghc-exactprint (cherry picked from commit 1324b8626aeb4dc2d6a04f7605d307ef13d1e0e9) - - - - - 9745a63e by Simon Peyton Jones at 2024-04-11T14:06:46-04:00 Deal with duplicate tyvars in type declarations GHC was outright crashing before this fix: #24604 (cherry picked from commit faa30b41a6f941627ddeeba805815b2742d312d1) - - - - - ed927271 by Alan Zimmerman at 2024-04-11T14:06:46-04:00 EPA: Use EpaLocation for RecFieldsDotDot So we can update it to a delta position in makeDeltaAst if needed. (cherry picked from commit 19883a23b8bc704118fa663d8bab00a503b5a527) - - - - - 220cda2c by Alan Zimmerman at 2024-04-11T14:06:46-04:00 EPA: Move DeltaPos and EpaLocation' into GHC.Types.SrcLoc This allows us to use a NoCommentsLocation for the possibly trailing comma location in a StringLiteral. This in turn allows us to correctly roundtrip via makeDeltaAst. (cherry picked from commit 12b997df559365e6188824fb10f5f61c2e9075e4) - - - - - 2d1c6074 by Ben Gamari at 2024-04-12T10:27:25-04:00 Bump parsec submodule to upstream master - - - - - 6efe55ef by Ben Gamari at 2024-04-12T10:27:27-04:00 testsuite: More aggressive normalisation of process004 output It turns out that this test uses `execvp`, not `exec` on CentOS 7. Normalise this spurious difference away. - - - - - 702ff84e by Ben Gamari at 2024-04-12T11:35:06-04:00 Bump array, binary, stm submodules - - - - - 3a18d9e7 by Ben Gamari at 2024-04-12T15:49:07-04:00 hadrian: Refactor treatment of extra dependencies The previous implementation was both hard to follow and repeated itself, making changes quite error-prone. Refactor this to be a bit more easier to reason about. - - - - - 2ed72644 by Ben Gamari at 2024-04-12T17:51:15-04:00 Bump time submodule to 1.14 As requested in #24528. - - - - - 3b63186d by Ben Gamari at 2024-04-13T09:07:57-04:00 Revert "Bump time submodule to 1.14" Unfortunately the `Lift` instances introduced in 1.14 trigger #22229. While it's unlikely that an end-user will observe this breakage, we cannot to ship a release with the CI breakage that this implies (as multi-component support would have no validation). Consequently, we have no choice but to try to fix #22229 and bump again in 9.12. This reverts commit 2ed7264434a2edee97ab441c9ccbdf675e0d7896. - - - - - b9b3b007 by Matthew Craven at 2024-04-15T10:57:59-04:00 Add release notes entry for GHC proposal 575 - - - - - 26b6c7fd by Matthew Craven at 2024-04-15T10:59:17-04:00 Users' guide: Fix base-ref links containing symbols - - - - - f15a854e by Alan Zimmerman at 2024-04-21T09:59:45+01:00 EPA: Add additional comments field to AnnsModule This is used in exact printing to store comments coming after the `where` keyword but before any comments allocated to imports or decls. It is used in ghc-exactprint, see https://github.com/alanz/ghc-exactprint/commit/44bbed311fd8f0d053053fef195bf... - - - - - c8d25501 by Alan Zimmerman at 2024-04-21T10:41:35+01:00 EPA: Fix comments in mkListSyntaxTy0 Also extend the test to confirm. Addresses #24669, 1 of 4 (cherry picked from commit f07015858fd79dca41983dbf3a249dfecd8d2eea) - - - - - 7d6ae7aa by Alan Zimmerman at 2024-04-21T11:39:48+01:00 EPA: Provide correct span for PatBind And remove unused parameter in checkPatBind Contributes to #24669 (cherry picked from commit c90c60390aa3949b400f26ee0534273c56e19005) - - - - - 64013156 by Alan Zimmerman at 2024-04-21T12:43:22+01:00 EPA: Fix span for PatBuilderAppType Include the location of the prefix @ in the span for InVisPat. Also removes unnecessary annotations from HsTP. Contributes to #24669 (cherry picked from commit 26036f96919b1a8b99715dd99724163012c719fc) - - - - - 898fcbd2 by Alan Zimmerman at 2024-04-21T13:49:41+01:00 EPA: Avoid duplicated comments in splice decls Contributes to #24669 (cherry picked from commit 2f8e3a254a20f4573aec26fc85ab74b51d661472) - - - - - 9f509a09 by Alan Zimmerman at 2024-04-21T15:32:17+01:00 EPA: Extend StringLiteral range to include trailing commas This goes slightly against the exact printing philosophy where trailing decorations should be in an annotation, but the practicalities of adding it to the WarningTxt environment, and the problems caused by deviating do not make a more principles approach worthwhile. (cherry picked from commit 00d3ecf0775c1a3f1ab8495e5e125f21d450394e) - - - - - 45cc3064 by Ben Gamari at 2024-04-24T11:00:59-04:00 Merge remote-tracking branch 'origin/wip/az/ghc-9.10-backports-1' into HEAD - - - - - d9cd4bde by Ben Gamari at 2024-04-24T11:01:34-04:00 ghc-internal: Fix mentions of ghc-internal in deprecation warnings Closes #24609. (cherry picked from commit 55eb8c98895308d2dd025f7bd64c0b80fce6ace3) - - - - - b8f9880c by Zubin Duggal at 2024-04-24T11:01:34-04:00 driver: Make `checkHomeUnitsClosed` faster The implementation of `checkHomeUnitsClosed` was traversing every single path in the unit dependency graph - this grows exponentially and quickly grows to be infeasible on larger unit dependency graphs. Instead we replace this with a faster implementation which follows from the specificiation of the closure property - there is a closure error if there are units which are both are both (transitively) depended upon by home units and (transitively) depend on home units, but are not themselves home units. To compute the set of units required for closure, we first compute the closure of the unit dependency graph, then the transpose of this closure, and find all units that are reachable from the home units in the transpose of the closure. (cherry picked from commit a933aff37992ea311a60be878379e7abf650e9fb) - - - - - 6d6c2640 by Ben Gamari at 2024-04-24T11:01:37-04:00 template-haskell: Declare TH.Lib.Internal as not-home Rather than `hide`. Closes #24659. (cherry picked from commit d7a3d6b5ee5e0c16af295579da3c54d8f0c37a05) - - - - - 88e31848 by Teo Camarasu at 2024-04-24T11:01:37-04:00 Fix ghc API link in docs/index.html This was missing part of the unit ID meaning it would 404. Resolves #24674 (cherry picked from commit f30e4984fb048818051465698ef8e4e20dacb577) - - - - - 1261ec2f by Simon Peyton Jones at 2024-04-24T11:01:37-04:00 Clone CoVars in CorePrep This MR addresses #24463. It's all explained in the new Note [Cloning CoVars and TyVars] (cherry picked from commit 9d38bfa0c0f910208822579acaa999f87c2f8c65) - - - - - bcb5a91d by Jade at 2024-04-24T11:06:13-04:00 Put the newline after errors instead of before them This mainly has consequences for GHCi but also slightly alters how the output of GHC on the commandline looks. Fixes: #22499 (cherry picked from commit 275e41a902f4aec8552707ec9924f2d0a20346d0) - - - - - be59c02c by Ben Gamari at 2024-04-25T12:51:45-04:00 Bump Cabal submodule to 3.12 - - - - - 5f4848c0 by Cheng Shao at 2024-04-25T12:54:20-04:00 ghc-bignum: remove obsolete ln script This commit removes an obsolete ln script in ghc-bignum/gmp. See 060251c24ad160264ae8553efecbb8bed2f06360 for its original intention, but it's been obsolete for a long time, especially since the removal of the make build system. Hence the house cleaning. (cherry picked from commit c62dc317c21026396a7a5581b90d17ef4c44f9ac) - - - - - f845a792 by Cheng Shao at 2024-04-25T12:54:22-04:00 ghc-bignum: update gmp to 6.3.0 This patch bumps the gmp-tarballs submodule and updates gmp to 6.3.0. The tarball format is now xz, and gmpsrc.patch has been patched into the tarball so hadrian no longer needs to deal with patching logic when building in-tree GMP. (cherry picked from commit 6399d52ba10d510a94c9db6552a4ea8aae8e003b) - - - - - 92065500 by Cheng Shao at 2024-04-25T12:54:23-04:00 hadrian: remove obsolete Patch logic This commit removes obsolete Patch logic from hadrian, given we no longer need to patch the gmp tarball when building in-tree GMP. (cherry picked from commit 65b4b92fa1e1989d055108a6077cc9119ee28acd) - - - - - 1e77ded1 by Cheng Shao at 2024-04-25T12:54:24-04:00 autoconf: remove obsolete patch detection This commit removes obsolete deletection logic of the patch command from autoconf scripts, given we no longer need to patch anything in the GHC build process. (cherry picked from commit 71f28958454872db9c21c7d974dd0f0a7c7e8f3d) - - - - - bb67e8d5 by Sylvain Henry at 2024-04-25T12:56:03-04:00 JS: correctly handle RUBBISH literals (#24664) (cherry picked from commit daeda83478d5b800d29661408dd67cc4b23df374) - - - - - 57b07e02 by Ben Gamari at 2024-04-26T09:26:51-04:00 docs: Don't use str.isascii `str.isascii` is only supported in Python 3.7 and later. - - - - - 2c6375b9 by Hécate Moonlight at 2024-05-01T01:44:10+02:00 Add missing entries in the base-4.20 release notes - - - - - b8c66bf3 by Rodrigo Mesquita at 2024-05-08T02:08:37-04:00 bindist: Fix xattr cleaning The original fix (725343aa) was incorrect because it used the shell bracket syntax which is the quoting syntax in autoconf, making the test for existence be incorrect and therefore `xattr` was never run. Fixes #24554 (cherry picked from commit e03760db6713068ad8ba953d2252ec12b3278c9b) - - - - - 250c5df7 by Ben Gamari at 2024-05-08T02:08:37-04:00 ghcup-metadata: Drop output_name field This is entirely redundant to the filename of the URL. There is no compelling reason to name the downloaded file differently from its source. - - - - - 7b327164 by Alan Zimmerman at 2024-05-08T02:08:37-04:00 EPA: check-exact: check that the roundtrip reproduces the source Closes #24670 (cherry picked from commit 981c2c2c5017cb7ae47babff4d2163324d7cbde6) - - - - - a8c27c7c by Alan Zimmerman at 2024-05-08T02:09:14-04:00 EPA: Preserve comments in Match Pats Closes #24708 Closes #24715 Closes #24734 (cherry picked from commit 1c2fd963d6fd78d1c752a21348c7db85f5d64df2) - - - - - e8603c75 by Alan Zimmerman at 2024-05-08T02:09:27-04:00 EPA: Preserve comments for PrefixCon Preserve comments in fun (Con {- c1 -} a b) = undefined Closes #24736 (cherry picked from commit 40026ac30fcdbe84a551f445f5e20691c0527ded) - - - - - 015a0430 by Alan Zimmerman at 2024-05-08T02:09:27-04:00 EPA: fix span for empty \case(s) In instance SDecide Nat where SZero %~ (SSucc _) = Disproved (\case) Ensure the span for the HsLam covers the full construct. Closes #24748 (cherry picked from commit 167a56a003106ed84742e3970cc2189ffb98b0c7) - - - - - c5a65a7f by Alan Zimmerman at 2024-05-08T02:09:27-04:00 EPA: preserve comments in class and data decls Fix checkTyClHdr which was discarding comments. Closes #24755 (cherry picked from commit 35d34fde62cd9e0002ac42f10bf705552f5c654e) - - - - - 43a7dc68 by Alan Zimmerman at 2024-05-08T02:09:27-04:00 EPA: fix mkHsOpTyPV duplicating comments Closes #24753 (cherry picked from commit 18f4ff84b323236f6dfd07f3bbc2842308a01e91) - - - - - 01eeecec by Alan Zimmerman at 2024-05-08T02:09:27-04:00 EPA: preserve comments in data decls Closes #24771 (cherry picked from commit 46328a49d988143111ab530d7907b9426b58311a) - - - - - 2c7a0cf7 by Simon Peyton Jones at 2024-05-08T02:09:27-04:00 Track in-scope variables in ruleCheckProgram This small patch fixes #24726, by tracking in-scope variables properly in -drule-check. Not hard to do! (cherry picked from commit be1e60eec0ec37da41643af17d78c698ab2a7083) - - - - - 4896c50b by Andrew Lelechenko at 2024-05-08T02:09:27-04:00 Document that setEnv is not thread-safe (cherry picked from commit a86167471a7a471fb75ae9ba6c641bd1e74bc16d) - - - - - 843f95b1 by Matthew Pickering at 2024-05-08T02:09:27-04:00 Don't depend on registerPackage function in Cabal More recent versions of Cabal modify the behaviour of libAbiHash which breaks our usage of registerPackage. It is simpler to inline the part of registerPackage that we need and avoid any additional dependency and complication using the higher-level function introduces. (cherry picked from commit 3fff09779d5830549ae455a15907b7bb9fe7859a) - - - - - 720ff1f9 by Hécate Moonlight at 2024-05-08T02:09:27-04:00 Correct `@since` metadata in HpcFlags It was introduced in base-4.20, not 4.22. Fix #24721 (cherry picked from commit 9213478931b18402998c18f5c4e6f0ee09054b18) - - - - - 7f9b05a8 by Teo Camarasu at 2024-05-08T02:09:27-04:00 doc: Fix type error in hs_try_putmvar example (cherry picked from commit 06f7db4001e4eee0f3076d949876f8f4af0eb6fb) - - - - - d5f45368 by Cheng Shao at 2024-05-08T09:39:29+01:00 driver: always merge objects when possible This patch makes the driver always merge objects with `ld -r` when possible, and only fall back to calling `ar -L` when merge objects command is unavailable. This completely reverts !8887 and !12313, given more fixes in Cabal seems to be needed to avoid breaking certain configurations and the maintainence cost is exceeding the behefits in this case :/ (cherry picked from commit 631cefec222e2db951c58db0b15a8d80ef5549cb) - - - - - 255f44e7 by Alan Zimmerman at 2024-05-08T20:07:57+01:00 EPA: Fix range for GADT decl with sig only Closes #24714 (cherry picked from commit d5bea4d6bce785b1d09f1b8faad7451af23b728d) - - - - - ea1bca98 by Alan Zimmerman at 2024-05-08T20:36:04+01:00 EPA: Preserve comments for pattern synonym sig Closes #24749 (cherry picked from commit bf3d4db0894233ec72f092a4a34bce9ed4ff4e21) - - - - - 2cb0fb44 by Alan Zimmerman at 2024-05-08T20:36:33+01:00 EPA: Widen stmtslist to include last semicolon Closes #24754 (cherry picked from commit 7eab4e019205cfced90f06242a9afa23dfcaa70b) - - - - - 776fa6e1 by Alan Zimmerman at 2024-05-08T20:49:33+01:00 EPA: Keep comments in a CaseAlt match The comments now live in the surrounding location, not inside the Match. Make sure we keep them. Closes #24707 (cherry picked from commit e916fc9215e66b15c7e2387cc087a9d1cc57bf77) - - - - - c192d254 by Ben Gamari at 2024-05-09T11:49:25-04:00 Revert "ghcup-metadata: Drop output_name field" This reverts commit 250c5df7875658f172804f511cd7eb325392f347. - - - - - 923e21bc by Ben Gamari at 2024-05-09T11:49:26-04:00 ghcup-metadata: Drop output_name This is entirely redundant to the filename of the URL. There is no compelling reason to name the downloaded file differently from its source. - - - - - 78092043 by Ryan Scott at 2024-05-09T11:49:26-04:00 unboxedSum{Type,Data}Name: Use GHC.Types as the module Unboxed sum constructors are now defined in the `GHC.Types` module, so if you manually quote an unboxed sum (e.g., `''Sum2#`), you will get a `Name` like: ```hs GHC.Types.Sum2# ``` The `unboxedSumTypeName` function in `template-haskell`, however, mistakenly believes that unboxed sum constructors are defined in `GHC.Prim`, so `unboxedSumTypeName 2` would return an entirely different `Name`: ```hs GHC.Prim.(#|#) ``` This is a problem for Template Haskell users, as it means that they can't be sure which `Name` is the correct one. (Similarly for `unboxedSumDataName`.) This patch fixes the implementations of `unboxedSum{Type,Data}Name` to use `GHC.Types` as the module. For consistency with `unboxedTupleTypeName`, the `unboxedSumTypeName` function now uses the non-punned syntax for unboxed sums (`Sum<N>#`) as the `OccName`. Fixes #24750. - - - - - 2cc6968a by Andrei Borzenkov at 2024-05-09T11:51:06-04:00 Fix tuple puns renaming (24702) Move tuple renaming short cutter from `isBuiltInOcc_maybe` to `isPunOcc_maybe`, so we consider incoming module. I also fixed some hidden bugs that raised after the change was done. (cherry picked from commit 94da936507c685aa8101a714e7619b4d428d0187) - - - - - 017c52b7 by Ben Gamari at 2024-05-09T18:39:46-04:00 Bump version to 9.10.1 - - - - - d07219d8 by Ben Gamari at 2024-05-09T22:52:06-04:00 generate_bootstrap_plans: Update - - - - - 6d779c0f by Ben Gamari at 2024-05-10T00:36:54-04:00 base: Fix release date in changelog - - - - - 66c914d6 by Rodrigo Mesquita at 2024-12-09T07:51:56-08:00 rts: free error message before returning Fixes a memory leak in rts/linker/PEi386.c - - - - - 5583003b by Alexis King at 2024-12-09T08:02:21-08:00 linker: Avoid linear search when looking up Haskell symbols via dlsym See the primary Note [Looking up symbols in the relevant objects] for a more in-depth explanation. When dynamically loading a Haskell symbol (typical when running a splice or GHCi expression), before this commit we would search for the symbol in all dynamic libraries that were loaded. However, this could be very inefficient when too many packages are loaded (which can happen if there are many package dependencies) because the time to lookup the would be linear in the number of packages loaded. This commit drastically improves symbol loading performance by introducing a mapping from units to the handles of corresponding loaded dlls. These handles are returned by dlopen when we load a dll, and can then be used to look up in a specific dynamic library. Looking up a given Name is now much more precise because we can get lookup its unit in the mapping and lookup the symbol solely in the handles of the dynamic libraries loaded for that unit. In one measurement, the wait time before the expression was executed went from +-38 seconds down to +-2s. This commit also includes Note [Symbols may not be found in pkgs_loaded], explaining the fallback to the old behaviour in case no dll can be found in the unit mapping for a given Name. Fixes #23415 Co-authored-by: Rodrigo Mesquita (@alt-romes) - - - - - 9e24947f by Rodrigo Mesquita at 2024-12-09T08:02:43-08:00 rts: Make addDLL a wrapper around loadNativeObj Rewrite the implementation of `addDLL` as a wrapper around the more principled `loadNativeObj` rts linker function. The latter should be preferred while the former is preserved for backwards compatibility. `loadNativeObj` was previously only available on ELF platforms, so this commit further refactors the rts linker to transform loadNativeObj_ELF into loadNativeObj_POSIX, which is available in ELF and MachO platforms. The refactor made it possible to remove the `dl_mutex` mutex in favour of always using `linker_mutex` (rather than a combination of both). Lastly, we implement `loadNativeObj` for Windows too. - - - - - 82df3315 by Rodrigo Mesquita at 2024-12-09T08:05:17-08:00 Use symbol cache in internal interpreter too This commit makes the symbol cache that was used by the external interpreter available for the internal interpreter too. This follows from the analysis in #23415 that suggests the internal interpreter could benefit from this cache too, and that there is no good reason not to have the cache for it too. It also makes it a bit more uniform to have the symbol cache range over both the internal and external interpreter. This commit also refactors the cache into a function which is used by both `lookupSymbol` and also by `lookupSymbolInDLL`, extending the caching logic to `lookupSymbolInDLL` too. - - - - - 2275dad5 by Ben Gamari at 2024-12-09T08:11:14-08:00 testsuite: Add test for lookupSymbolInNativeObj - - - - - 37f0cf5c by Zubin Duggal at 2024-12-09T09:46:45-08:00 Don't store a GlobalRdrEnv in `mi_globals` for GHCi. GHCi only needs the `mi_globals` field for modules imported with :module +*SomeModule. It uses this field to make the top level environment in `SomeModule` available to the repl. By default, only the first target in the command line parameters is "star" loaded into GHCi. Other modules have to be manually "star" loaded into the repl. Storing the top level GlobalRdrEnv for each module is very wasteful, especially given that we will most likely never need most of these environments. Instead we store only the information needed to reconstruct the top level environment in a module, which is the `IfaceTopEnv` data structure, consisting of all import statements as well as all top level symbols defined in the module (not taking export lists into account) When a particular module is "star-loaded" into GHCi (as the first commandline target, or via an explicit `:module +*SomeModule`, we reconstruct the top level environment on demand using the `IfaceTopEnv`. - - - - - 55cf74b3 by Cheng Shao at 2024-12-09T09:46:45-08:00 driver: add -dep-json -opt-json flags to ghc -M docs: document -dep-json -opt-json flags Rework protocol merge opt-json into dep-json normalize source filenames include more canonical variant of the package id choose the main library when -package matches multiple units with the same version allow specifying library deps with -package pkg:lib Backported to GHC 9.10 - - - - - d8900f97 by Torsten Schmits at 2024-12-09T09:46:45-08:00 Parallelize getRootSummary computations in dep analysis downsweep This reuses the upsweep step's infrastructure to process batches of modules in parallel. I benchmarked this by running `ghc -M` on two sets of 10,000 modules; one with a linear dependency chain and the other with a binary tree. Comparing different values for the number of modules per thread suggested an optimum at `length targets `div` (n_cap * 2)`, with results similar to this one (6 cores, 12 threads): ``` Benchmark 1: linear 1 jobs Time (mean ± σ): 1.775 s ± 0.026 s [User: 1.377 s, System: 0.399 s] Range (min … max): 1.757 s … 1.793 s 2 runs Benchmark 2: linear 6 jobs Time (mean ± σ): 876.2 ms ± 20.9 ms [User: 1833.2 ms, System: 518.6 ms] Range (min … max): 856.2 ms … 898.0 ms 3 runs Benchmark 3: linear 12 jobs Time (mean ± σ): 793.5 ms ± 23.2 ms [User: 2318.9 ms, System: 718.6 ms] Range (min … max): 771.9 ms … 818.0 ms 3 runs ``` Results don't differ much when the batch size is reduced to a quarter of that, but there's significant thread scheduling overhead for a size of 1: ``` Benchmark 1: linear 1 jobs Time (mean ± σ): 2.611 s ± 0.029 s [User: 2.851 s, System: 0.783 s] Range (min … max): 2.591 s … 2.632 s 2 runs Benchmark 2: linear 6 jobs Time (mean ± σ): 1.189 s ± 0.007 s [User: 2.707 s, System: 1.103 s] Range (min … max): 1.184 s … 1.194 s 2 runs Benchmark 3: linear 12 jobs Time (mean ± σ): 1.097 s ± 0.006 s [User: 2.938 s, System: 1.300 s] Range (min … max): 1.093 s … 1.101 s 2 runs ``` Larger batches also slightly worsen performance. - - - - - 1fd9b9b0 by Ben Gamari at 2025-07-09T13:41:43+02:00 testsuite: Add broken test for CApiFFI with -fprefer-bytecode See #24634. - - - - - c9cf4bb9 by Fendor at 2025-07-09T13:41:51+02:00 Typecheck corebindings lazily during bytecode generation This delays typechecking the corebindings until the bytecode generation happens. We also avoid allocating a thunk that is retained by `unsafeInterleaveIO`. In general, we shouldn't retain values of the hydrated `Type`, as not evaluating the bytecode object keeps it alive. It is better if we retain the unhydrated `IfaceType`. See Note [Hydrating Modules] - - - - - 7812dbe8 by Sylvain Henry at 2025-07-09T13:42:51+02:00 Linker: some refactoring to prepare for #24886 - Rename LoadedBCOs into LazyBCOs - Bundle SptEntries with CompiledByteCode and removed [SptEntry] field from the BCOs constructor - Rename Linkable's LM constructor into Linkable: in the past we had LM and LP for Module and Package, now we only have the former. - Rename Unlinked into LinkablePart (and linkableUnlinked into linkableParts) - Use NonEmpty to encode invariant in Linkable's linkableParts type - Add helpers: linkableLibs, linkableBCOs, etc. - Add documentation - Remove partial nameOfObject - Rename nameOfObject_maybe into linkablePartPath - Rename byteCodeOfObject into linkablePartAllBCOs. - Refactor linkablePartAllBCOs to avoid a panic if a LazyBCO has a C stub. Document the fact that LazyBCOs are returned in this case (contrary to linkableBCOs which only returns non-lazy ones) Refactoring done while trying to understand how to adapt the linker code to support the JS backend too (cf #24886). - - - - - 5cbf25ba by Cheng Shao at 2025-07-09T23:00:48+02:00 compiler: Store ForeignStubs and foreign C files in interfaces This data is used alongside Core bindings to reconstruct intermediate build products when linking Template Haskell splices with bytecode. Since foreign stubs and files are generated in the pipeline, they were lost with only Core bindings stored in interfaces. The interface codec type `IfaceForeign` contains a simplified representation of `ForeignStubs` and the set of foreign sources that were manually added by the user. When the backend phase writes an interface, `mkFullIface` calls `encodeIfaceForeign` to read foreign source file contents and assemble `IfaceForeign`. After the recompilation status check of an upstream module, `initWholeCoreBindings` calls `decodeIfaceForeign` to restore `ForeignStubs` and write the contents of foreign sources to the file system as temporary files. The restored foreign inputs are then processed by `hscInteractive` in the same manner as in a regular pipeline. When linking the stub objects for splices, they are excluded from suffix adjustment for the interpreter way through a new flag in `Unlinked`. For details about these processes, please consult Note [Foreign stubs and TH bytecode linking]. Metric Decrease: T13701 - - - - - 058b242b by Torsten Schmits at 2025-07-09T23:00:48+02:00 Build foreign objects for TH with interpreter's way when loading from iface Fixes #25211 When linking bytecode for TH from interface core bindings with `-fprefer-byte-code`, foreign sources are loaded from the interface as well and compiled to object code in an ad-hoc manner. The results are then loaded by the interpreter, whose way may differ from the current build's target way. This patch ensures that foreign objects are compiled with the interpreter's way. - - - - - 9e7ce01f by Cheng Shao at 2025-07-09T23:00:48+02:00 Link bytecode from interface-stored core bindings in oneshot mode !13042 Part of #T25090 If the flag `-fprefer-byte-code` is given when compiling a module containing TH, GHC will use Core bindings stored in interfaces to compile and link bytecode for splices. This was only implemented for `--make` mode initially, so this commit adds the same mechanism to oneshot mode (`-c`). When an interface is loaded into the EPS in `loadInterface` that has dehydrated Core bindings, an entry is added to the new field `eps_iface_bytecode`, containing an IO action that produces a bytecode `Linkable`, lazily processing the `mi_extra_decls` by calling `loadIfaceByteCode`. When Template Haskell dependencies are resolved in `getLinkDeps`, this action is looked up after loading a module's interface. If it exists, the action is evaluated and the bytecode is added to the set of `Linkable`s used for execution of the splice; otherwise it falls back on the traditional object file. Metric Decrease: MultiLayerModules T13701 - - - - - 501a027c by Cheng Shao at 2025-07-09T23:00:48+02:00 testsuite: add T25414 test case marked as broken This commit adds T25414 test case to demonstrate #25414. It is marked as broken and will be fixed by the next commit. - - - - - 2b97ea5e by Cheng Shao at 2025-07-09T23:00:48+02:00 driver: fix foreign stub handling logic in hscParsedDecls This patch fixes foreign stub handling logic in `hscParsedDecls`. Previously foreign stubs were simply ignored here, so any feature that involve foreign stubs would not work in ghci (e.g. CApiFFI). The patch reuses `generateByteCode` logic and eliminates a large chunk of duplicate logic that implements Core to bytecode generation pipeline here. Fixes #25414. - - - - - 3668b3e3 by Torsten Schmits at 2025-07-09T23:00:48+02:00 Link interface bytecode from package DBs if possible Part of #25090. MR !13068 When splices are executed with `-fprefer-byte-code`, the loader will compile Core bindings to bytecode if those are present in interfaces of module dependencies. So far, this only applied to local modules (i.e. home modules in make mode and non-package deps in oneshot mode). This patch extends support to interfaces loaded from a package DB. In `getLinkDeps`, the dependencies chosen for recursion were restricted to `dep_direct_mods`, which has been changed to include external dependencies, stored in a new field named `dep_direct_pkg_mods`. In order to unify treatment of the different link variants across make/oneshot mode, the algorithm's intermediate results have been abstracted into the data types `LinkDep` and `LinkModule`. Metric Decrease: MultiLayerModulesTH_Make MultiLayerModulesTH_OneShot - - - - - 8918fb72 by Cheng Shao at 2025-07-09T23:00:48+02:00 compiler: implement --show-iface-abi-hash major mode - - - - - 2eac507f by Ian-Woo Kim at 2025-07-09T23:00:48+02:00 set extra_decls = Nothing in interpreter after interface generation - - - - - 75c6f24b by Ben Gamari at 2025-07-09T23:00:48+02:00 rts: Tighten up invariants of PACK - - - - - 1bd1bdbe by Ben Gamari at 2025-07-09T23:00:48+02:00 StgToByteCode: Don't assume that data con workers are nullary Previously StgToByteCode assumed that all data-con workers were of a nullary representation. This is not a valid assumption, as seen in #23210, where an unsaturated application of a unary data constructor's worker resulted in invalid bytecode. Sadly, I have not yet been able to reduce a minimal testcase for this. Fixes #23210. - - - - - 4c808a96 by Cheng Shao at 2025-07-09T23:00:48+02:00 driver: fix hpc undefined symbol issue in TH with -fprefer-byte-code This commit fixes an undefined symbol error in RTS linker when attempting to compile home modules with -fhpc and -fbyte-code-and-object-code/-fprefer-byte-code, see #25510 for detailed description and analysis of the bug. Also adds T25510/T25510c regression tests to test make mode/oneshot mode of the bug. backported to GHC 9.10. - - - - - c8d26872 by Rebecca Turner at 2025-07-09T23:00:48+02:00 ghc-internal: No trailing whitespace in exceptions This is a backport of the *behavior* in https://gitlab.haskell.org/ghc/ghc/-/commit/bfe600f5bb3ecd2c8fa71c536c63d3c4... The commit upstream depends on a bunch of other changes to the exception reporting infrastructure, so I've chosen to recreate its behavior here rather than pulling in all the dependent patches. This fixes a regression where GHC 9.10.1 adds a trailing newline to the `displayException` implementation for `SomeException`. This has been reverted in `master` but 9.10.2 isn't out yet and there's various changes the upstream commit depends on, so this is a simple one-line fix. See: https://gitlab.haskell.org/ghc/ghc/-/issues/25052 - - - - - 661995d3 by Torsten Schmits at 2025-07-09T23:00:49+02:00 refactor quadratic search in warnMissingHomeModules - - - - - 0a2b61de by Rodrigo Mesquita at 2025-07-09T23:00:49+02:00 Improve reachability queries on ModuleGraph Introduces `ReachabilityIndex`, an index constructed from a `GHC.Data.Graph.Directed` `Graph` that supports fast reachability queries (in $O(1)$). This abstract data structure is exposed from `GHC.Data.Graph.Directed.Reachability`. This index is constructed from the module graph nodes and cached in `ModuleGraph`, enabling efficient reachability queries on the module graph. Previously, we'd construct a Map of Set of ModuleGraph nodes which used a lot of memory (`O(n^2)` in the number of nodes) and cache that in the `ModuleGraph`. By using the reachability index we get rid of this space leak in the module graph -- even though the index is still quadratic in the number of modules, it is much, much more space efficient due to its representation using an IntMap of IntSet as opposed to the transitive closure we previously cached. In a memory profile of MultiLayerModules with 100x100 modules, memory usage improved from 6GB residency to 2.8GB, out of which roughly 1.8GB are caused by a second space leak related to ModuleGraph. On the same program, it brings compile time from 7.5s to 5.5s. Note how we simplify `checkHomeUnitsClosed` in terms of `isReachableMany` and by avoiding constructing a second graph with the full transitive closure -- it suffices to answer the reachability query on the full graph without collapsing the transitive closure completely into nodes. Unfortunately, solving this leak means we have to do a little bit more work since we can no longer cache the result of turning vertex indices into nodes. This results in a slight regression in MultiLayerModulesTH_Make, but results in large performance and memory wins when compiling large amounts of modules. ------------------------- Metric Decrease: mhu-perf Metric Increase: MultiLayerModulesTH_Make ------------------------- - - - - - b3079fa3 by Ian-Woo Kim at 2025-07-09T23:00:49+02:00 similarize the parallel downsweep to GHC HEAD version. - - - - - b6cd4810 by Matthew Pickering at 2025-07-09T23:00:49+02:00 Use deterministic names for temporary files When there are multiple threads they can race to create a temporary file, in some situations the thread will create ghc_1.c and in some it will create ghc_2.c. This filename ends up in the debug info for object files after compiling a C file, therefore contributes to object nondeterminism. In order to fix this we store a prefix in `TmpFs` which serves to namespace temporary files. The prefix is populated from the counter in TmpFs when the TmpFs is forked. Therefore the TmpFs must be forked outside the thread which consumes it, in a deterministic order, so each thread always receives a TmpFs with the same prefix. This assumes that after the initial TmpFs is created, all other TmpFs are created from forking the original TmpFs. Which should have been try anyway as otherwise there would be file collisions and non-determinism. Fixes #25224 - - - - - f6d625eb by Ian-Woo Kim at 2025-07-09T23:00:49+02:00 monotonic FinderCache. missed part from parallel downsweep latest GHC HEAD patch - - - - - 0d3a068a by Andreas Klebinger at 2025-07-09T23:00:49+02:00 SpecConstr: Introduce a separate argument limit for forced specs. We used to put no limit at all on specializations forced via the SPEC argument. This isn't always reasonable so we introduce a very high limit that applies to forced specializations, a flag to control it, and we now emit a warning if we fail a specialization because we exceed the warning. Fixes #25197 - - - - - 6eba53b2 by Ian-Woo Kim at 2025-07-10T12:40:09+02:00 No in-memory resident mi_extra_decls in compilation. They are transiently loaded and removed after byte-code generation. - - - - - 207e5674 by Georgios Karachalias at 2025-12-02T22:28:52+01:00 Use OsPath in PkgDbRef and UnitDatabase, not FilePath - - - - - fd00538d by Matthew Pickering at 2025-12-12T01:48:57+01:00 Various downsweep perf tweaks - - - - - f2fab894 by Torsten Schmits at 2025-12-12T01:48:57+01:00 Abstract out parts of mkUnitState into a handler type - - - - - 8a88d4ee by Torsten Schmits at 2025-12-12T01:48:57+01:00 Abstract out module provider queries into a handler type - - - - - 66c776ea by Torsten Schmits at 2025-12-12T01:48:57+01:00 Use unit index for name printing - - - - - b989904c by Fendor at 2026-01-16T17:26:40+01:00 Bunch of backports - - - - - ff5e16b0 by Sjoerd Visscher at 2026-03-13T16:20:54+01:00 Don't store boot locations in finder cache Partially reverts commit fff55592a7b Amends add(Home)ModuleToFinder so that locations for boot files are not stored in the finder cache. Removes InstalledModule field from InstalledFound constructor since it's the same as the key that was searched for. - - - - - ffceb7e6 by Sjoerd Visscher at 2026-03-13T16:36:00+01:00 Concentrate boot extension logic in Finder With new mkHomeModLocation that takes an extra HscSource to add boot extensions if required. - - - - - 65d1ec83 by Torsten Schmits at 2026-03-13T16:39:40+01:00 Add a complete pragma for `ModLocation` - - - - - 2a1c0d24 by Torsten Schmits at 2026-04-17T01:38:02+02:00 Fixed nodes - - - - - 496 changed files: - .gitlab-ci.yml - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - .gitlab/rel_eng/recompress-all - .gitlab/rel_eng/upload.sh - compiler/GHC.hs - compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/ByteCode/Linker.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/CLabel.hs - compiler/GHC/Core/Map/Expr.hs - compiler/GHC/Core/Opt/Pipeline.hs - compiler/GHC/Core/Opt/Simplify/Utils.hs - compiler/GHC/Core/Opt/SpecConstr.hs - 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