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[Git][ghc/ghc][wip/T20264] Add missing mkAbsCoreApps
by Simon Peyton Jones (＠simonpj) 22 Jul '25

22 Jul '25

Simon Peyton Jones pushed to branch wip/T20264 at Glasgow Haskell Compiler / GHC Commits: a7763a74 by Simon Peyton Jones at 2025-07-23T00:00:32+01:00 Add missing mkAbsCoreApps ...which caused bad Lint errors - - - - - 2 changed files: - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Utils.hs Changes: ===================================== compiler/GHC/Core/Opt/SetLevels.hs ===================================== @@ -1836,7 +1836,7 @@ newPolyBndrs dest_lvl ; return (env', new_bndrs) } where -- See Note [le_subst and le_env] - add_subst env (v, v') = extendIdSubst env v (mkVarApps (Var v') abs_vars) + add_subst env (v, v') = extendIdSubst env v (mkAbsVarApps (Var v') abs_vars) add_id env (v, v') = extendVarEnv env v ((v':abs_vars), mkAbsVarApps (Var v') abs_vars) mk_poly_bndr bndr uniq ===================================== compiler/GHC/Core/Utils.hs ===================================== @@ -3116,7 +3116,7 @@ type AbsVars = [AbsVar] type TaggedAbsVars t = [TaggedBndr t] mkPolyAbsLams :: (b -> AbsVar, Var -> b -> b) - -> [b] -> Expr b -> Expr b + -> [b] -> Expr b -> Expr b -- `mkPolyAbsLams` is polymorphic in (get,set) so that we can -- use it for both CoreExpr and LevelledExpr {-# INLINE mkPolyAbsLams #-} View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/a7763a744c0b28579661bfc49340258… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/a7763a744c0b28579661bfc49340258… 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] 5 commits: Fix issues with toRational for types capable to represent infinite and not-a-number values
by Marge Bot (＠marge-bot) 22 Jul '25

22 Jul '25

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: 477b1e42 by Andrew Lelechenko at 2025-07-22T16:03:00-04:00 Fix issues with toRational for types capable to represent infinite and not-a-number values This commit fixes all of the following pitfalls: > toRational (read "Infinity" :: Double) 179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216 % 1 > toRational (read "NaN" :: Double) 269653970229347386159395778618353710042696546841345985910145121736599013708251444699062715983611304031680170819807090036488184653221624933739271145959211186566651840137298227914453329401869141179179624428127508653257226023513694322210869665811240855745025766026879447359920868907719574457253034494436336205824 % 1 > realToFrac (read "NaN" :: Double) -- With -O0 Infinity > realToFrac (read "NaN" :: Double) -- With -O1 NaN > realToFrac (read "NaN" :: Double) :: CDouble Infinity > realToFrac (read "NaN" :: CDouble) :: Double Infinity Implements https://github.com/haskell/core-libraries-committee/issues/338 - - - - - d70620a5 by Zubin Duggal at 2025-07-22T16:03:01-04:00 haddock: Don't warn about missing link destinations for derived names. Fixes #26114 - - - - - 70668033 by Matthew Pickering at 2025-07-22T16:03:02-04:00 template haskell: use a precise condition when implicitly lifting Implicit lifting corrects a level error by replacing references to `x` with `$(lift x)`, therefore you can use a level `n` binding at level `n + 1`, if it can be lifted. Therefore, we now have a precise check that the use level is 1 more than the bind level. Before this bug was not observable as you only had 0 and 1 contexts but it is easily evident when using explicit level imports. Fixes #26088 - - - - - 5bfd76e1 by Andreas Klebinger at 2025-07-22T16:03:03-04:00 Add since tag and more docs for do-clever-arg-eta-expansion Fixes #26113 - - - - - 9359f9a4 by Andreas Klebinger at 2025-07-22T16:03:03-04:00 Add since tag for -fexpose-overloaded-unfoldings Fixes #26112 - - - - - 15 changed files: - compiler/GHC/Rename/Splice.hs - docs/users_guide/using-optimisation.rst - libraries/base/changelog.md - libraries/ghc-internal/src/GHC/Internal/Float.hs - libraries/ghc-internal/src/GHC/Internal/Real.hs - testsuite/tests/haddock/haddock_testsuite/Makefile - + testsuite/tests/haddock/haddock_testsuite/T26114.hs - + testsuite/tests/haddock/haddock_testsuite/T26114.stdout - testsuite/tests/haddock/haddock_testsuite/all.T - testsuite/tests/numeric/should_run/T9810.stdout - + testsuite/tests/splice-imports/T26088.stderr - + testsuite/tests/splice-imports/T26088A.hs - + testsuite/tests/splice-imports/T26088B.hs - testsuite/tests/splice-imports/all.T - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs Changes: ===================================== compiler/GHC/Rename/Splice.hs ===================================== @@ -35,6 +35,7 @@ import GHC.Rename.Pat ( rnPat ) import GHC.Types.Error import GHC.Types.Basic ( TopLevelFlag, isTopLevel, maxPrec ) import GHC.Types.SourceText ( SourceText(..) ) +import GHC.Types.ThLevelIndex import GHC.Utils.Outputable import GHC.Unit.Module import GHC.Types.SrcLoc @@ -1001,7 +1002,7 @@ checkCrossLevelLifting dflags reason top_lvl is_local allow_lifting bind_lvl use , xopt LangExt.ImplicitStagePersistence dflags = when (isExternalName name) (keepAlive name) >> return (HsVar noExtField name_var) -- 4. Name is in a bracket, and lifting is allowed | Brack _ pending <- use_lvl - , any (use_lvl_idx >=) (Set.toList bind_lvl) + , any (\bind_idx -> use_lvl_idx == incThLevelIndex bind_idx) (Set.toList bind_lvl) , allow_lifting = do let mgre = case reason of ===================================== docs/users_guide/using-optimisation.rst ===================================== @@ -547,16 +547,24 @@ as such you shouldn't need to set any of them explicitly. A flag Eta-expand let-bindings to increase their arity. .. ghc-flag:: -fdo-clever-arg-eta-expansion - :shortdesc: Enable sophisticated argument eta-expansion. Implied by :ghc-flag:`-O2`. + :shortdesc: Enable sophisticated argument eta-expansion. Implied by :ghc-flag:`-O`. :type: dynamic :reverse: -fno-do-clever-arg-eta-expansion :category: :default: off + :since: 9.10.1 Eta-expand arguments to increase their arity to avoid allocating unnecessary thunks for them. + For example in code like `foo = f (g x)` this flag will determine which analysis + is used to decide the arity of `g x`, with the goal of avoiding a thunk for `g x` + in cases where `g` is a function with an arity higher than one. + + Enabling the flag enables a more sophisticated analysis, resulting in better + runtime but longer compile time. + .. ghc-flag:: -feager-blackholing :shortdesc: Turn on :ref:`eager blackholing <parallel-compile-options>` :type: dynamic @@ -617,6 +625,7 @@ as such you shouldn't need to set any of them explicitly. A flag :category: :default: off + :since: 9.12.1 This experimental flag is a slightly less heavy weight alternative to :ghc-flag:`-fexpose-all-unfoldings`. ===================================== libraries/base/changelog.md ===================================== @@ -2,6 +2,7 @@ ## 4.23.0.0 *TBA* * Add `Data.List.NonEmpty.mapMaybe`. ([CLC proposal #337](https://github.com/haskell/core-libraries-committee/issues/337)) + * Fix issues with toRational for types capable to represent infinite and not-a-number values ([CLC proposal #338](https://github.com/haskell/core-libraries-committee/issues/338)) ## 4.22.0.0 *TBA* * Shipped with GHC 9.14.1 ===================================== libraries/ghc-internal/src/GHC/Internal/Float.hs ===================================== @@ -430,14 +430,10 @@ naturalToFloat# (NB b) = case integerToBinaryFloat' (IP b) of -- | @since base-2.01 -- --- Beware that 'toRational' generates garbage for non-finite arguments: --- --- >>> toRational (1/0 :: Float) --- 340282366920938463463374607431768211456 % 1 --- >>> toRational (0/0 :: Float) --- 510423550381407695195061911147652317184 % 1 --- instance Real Float where + toRational x + | isInfinite x = if x > 0 then infinity else -infinity + | isNaN x = notANumber toRational (F# x#) = case decodeFloat_Int# x# of (# m#, e# #) @@ -686,14 +682,10 @@ naturalToDouble# (NB b) = case integerToBinaryFloat' (IP b) of -- | @since base-2.01 -- --- Beware that 'toRational' generates garbage for non-finite arguments: --- --- >>> toRational (1/0) --- 179769313 (and 300 more digits...) % 1 --- >>> toRational (0/0) --- 269653970 (and 300 more digits...) % 1 --- instance Real Double where + toRational x + | isInfinite x = if x > 0 then infinity else -infinity + | isNaN x = notANumber toRational (D# x#) = case integerDecodeDouble# x# of (# m, e# #) ===================================== libraries/ghc-internal/src/GHC/Internal/Real.hs ===================================== @@ -703,15 +703,6 @@ fromIntegral = fromInteger . toInteger -- | General coercion to 'Fractional' types. -- --- WARNING: This function goes through the 'Rational' type, which does not have values for 'NaN' for example. --- This means it does not round-trip. --- --- For 'Double' it also behaves differently with or without -O0: --- --- > Prelude> realToFrac nan -- With -O0 --- > -Infinity --- > Prelude> realToFrac nan --- > NaN realToFrac :: (Real a, Fractional b) => a -> b {-# NOINLINE [1] realToFrac #-} -- See Note [Allow time for type-specialisation rules to fire] ===================================== testsuite/tests/haddock/haddock_testsuite/Makefile ===================================== @@ -76,3 +76,7 @@ hypsrcTest: .PHONY: haddockForeignTest haddockForeignTest: '$(HADDOCK)' A.hs B.hs F.hs arith.c + +.PHONY: T26114 +T26114: + '$(HADDOCK)' T26114.hs ===================================== testsuite/tests/haddock/haddock_testsuite/T26114.hs ===================================== @@ -0,0 +1,23 @@ +{-# LANGUAGE TypeFamilies #-} + +-- | Module +module T26114 where + +-- | C1 +class C1 t where + type C2 t + +-- | A +data A = A + +instance C1 A where + type C2 A = B + +-- | B +data B = B + +instance C1 B where + type C2 B = C + +-- | C +data C = C ===================================== testsuite/tests/haddock/haddock_testsuite/T26114.stdout ===================================== @@ -0,0 +1,3 @@ +[1 of 1] Compiling T26114 ( T26114.hs, nothing ) +Haddock coverage: + 100% ( 5 / 5) in 'T26114' ===================================== testsuite/tests/haddock/haddock_testsuite/all.T ===================================== @@ -24,3 +24,8 @@ test('haddockForeignTest', [ignore_stdout, ignore_stderr, req_haddock, extra_files(['./haddock-th-foreign-repro/A.hs', './haddock-th-foreign-repro/B.hs', './haddock-th-foreign-repro/F.hs', './haddock-th-foreign-repro/arith.c'])], makefile_test, ['haddockForeignTest']) + +test('T26114', + [ignore_stderr, req_haddock, extra_files(['T26114.hs'])], + makefile_test, + ['T26114']) ===================================== testsuite/tests/numeric/should_run/T9810.stdout ===================================== @@ -1,14 +1,14 @@ ## Double ## Infinity -Infinity -Infinity +NaN Infinity -Infinity Infinity ## Float ## Infinity -Infinity -Infinity +NaN Infinity -Infinity Infinity ===================================== testsuite/tests/splice-imports/T26088.stderr ===================================== @@ -0,0 +1,6 @@ +T26088A.hs:8:8: error: [GHC-28914] + • Level error: ‘a’ is bound at level -1 but used at level 1 + • Available from the imports: + • imported from ‘T26088B’ at -1 at T26088A.hs:4:1-21 + • In the Template Haskell quotation: [| a |] + ===================================== testsuite/tests/splice-imports/T26088A.hs ===================================== @@ -0,0 +1,8 @@ +{-# LANGUAGE ExplicitLevelImports, TemplateHaskell #-} +module T26088A where + +import splice T26088B +import Language.Haskell.TH.Syntax + +x :: Q Exp +x = [| a |] ===================================== testsuite/tests/splice-imports/T26088B.hs ===================================== @@ -0,0 +1,3 @@ +module T26088B where + +a = () ===================================== testsuite/tests/splice-imports/all.T ===================================== @@ -47,3 +47,4 @@ test('SI35', ['-package ghc']) test('SI36', [extra_files(["SI36_A.hs", "SI36_B1.hs", "SI36_B2.hs", "SI36_B3.hs", "SI36_C1.hs", "SI36_C2.hs", "SI36_C3.hs"])], multimod_compile_fail, ['SI36', '-v0']) test('T26087', [], multimod_compile_fail, ['T26087A', '']) +test('T26088', [], multimod_compile_fail, ['T26088A', '-v0']) ===================================== utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs ===================================== @@ -110,6 +110,7 @@ renameInterface ignoreSet renamingEnv expInfo warnings hoogle iface = do && isExternalName name && not (isBuiltInSyntax name) && not (isTyVarName name) + && not (isDerivedOccName $ nameOccName name) && Exact name /= eqTyCon_RDR -- Must not be in the set of ignored symbols for the module or the -- unqualified ignored symbols View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/7f86eda911a3702097f1db29f6d133… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/7f86eda911a3702097f1db29f6d133… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T25944] 32 commits: Specialise: Improve specialisation by refactoring interestingDict
by Sebastian Graf (＠sgraf812) 22 Jul '25

22 Jul '25

Sebastian Graf pushed to branch wip/T25944 at Glasgow Haskell Compiler / GHC Commits: f707bab4 by Andreas Klebinger at 2025-07-12T14:56:16+01:00 Specialise: Improve specialisation by refactoring interestingDict This MR addresses #26051, which concerns missed type-class specialisation. The main payload of the MR is to completely refactor the key function `interestingDict` in GHC.Core.Opt.Specialise The main change is that we now also look at the structure of the dictionary we consider specializing on, rather than only the type. See the big `Note [Interesting dictionary arguments]` - - - - - ca7a9d42 by Simon Peyton Jones at 2025-07-12T14:56:16+01:00 Treat tuple dictionaries uniformly; don't unbox them See `Note [Do not unbox class dictionaries]` in DmdAnal.hs, sep (DNB1). This MR reverses the plan in #23398, which suggested a special case to unbox tuple dictionaries in worker/wrapper. But: - This was the cause of a pile of complexity in the specialiser (#26158) - Even with that complexity, specialision was still bad, very bad See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 And it's entirely unnecessary! Specialision works fine without unboxing tuple dictionaries. - - - - - be7296c9 by Andreas Klebinger at 2025-07-12T14:56:16+01:00 Remove complex special case from the type-class specialiser There was a pretty tricky special case in Specialise which is no longer necessary. * Historical Note [Floating dictionaries out of cases] * #26158 * #19747 https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 This MR removes it. Hooray. - - - - - 4acf3a86 by Ben Gamari at 2025-07-15T05:46:32-04:00 configure: bump version to 9.15 - - - - - 45efaf71 by Teo Camarasu at 2025-07-15T05:47:13-04:00 rts/nonmovingGC: remove n_free We remove the nonmovingHeap.n_free variable. We wanted this to track the length of nonmovingHeap.free. But this isn't possible to do atomically. When this isn't accurate we can get a segfault by going past the end of the list. Instead, we just count the length of the list when we grab it in nonmovingPruneFreeSegment. Resolves #26186 - - - - - c635f164 by Ben Gamari at 2025-07-15T14:05:54-04:00 configure: Drop probing of ld.gold As noted in #25716, `gold` has been dropped from binutils-2.44. Fixes #25716. Metric Increase: size_hello_artifact_gzip size_hello_unicode_gzip ghc_prim_so - - - - - 637bb538 by Ben Gamari at 2025-07-15T14:05:55-04:00 testsuite/recomp015: Ignore stderr This is necessary since ld.bfd complains that we don't have a .note.GNU-stack section, potentially resulting in an executable stack. - - - - - d3cd4ec8 by Wen Kokke at 2025-07-15T14:06:39-04:00 Fix documentation for heap profile ID - - - - - 73082769 by Ben Gamari at 2025-07-15T16:56:38-04:00 Bump win32-tarballs to v0.9 - - - - - 3b63b254 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/LoadArchive: Handle null terminated string tables As of `llvm-ar` now emits filename tables terminated with null characters instead of the usual POSIX `/\n` sequence. Fixes #26150. - - - - - 195f6527 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: rename label so name doesn't conflict with param - - - - - 63373b95 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Handle API set symbol versioning conflicts - - - - - 48e9aa3e by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Mark API set symbols as HIDDEN and correct symbol type - - - - - 959e827a by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Implement WEAK EXTERNAL undef redirection by target symbol name - - - - - 65f19293 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/LoadArchive: Handle string table entries terminated with / llvm-ar appears to terminate string table entries with `/\n` [1]. This matters in the case of thin archives, since the filename is used. In the past this worked since `llvm-ar` would produce archives with "small" filenames when possible. However, now it appears to always use the string table. [1] https://github.com/llvm/llvm-project/blob/bfb686bb5ba503e9386dc899e1ebbe248… - - - - - 9cbb3ef5 by Ben Gamari at 2025-07-15T16:56:39-04:00 testsuite: Mark T12497 as fixed Thanks to the LLVM toolchain update. Closes #22694. - - - - - 2854407e by Ben Gamari at 2025-07-15T16:56:39-04:00 testsuite: Accept new output of T11223_link_order_a_b_2_fail on Windows The archive member number changed due to the fact that llvm-ar now uses a string table. - - - - - 28439593 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/linker/PEi386: Implement IMAGE_REL_AMD64_SECREL This appears to now be used by libc++ as distributed by msys2. - - - - - 2b053755 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Cleanup merge resolution residue in lookupSymbolInDLL_PEi386 and make safe without dependent - - - - - e8acd2e7 by Wen Kokke at 2025-07-16T08:37:04-04:00 Remove the `profile_id` parameter from various RTS functions. Various RTS functions took a `profile_id` parameter, intended to be used to distinguish parallel heap profile breakdowns (e.g., `-hT` and `-hi`). However, this feature was never implemented and the `profile_id` parameter was set to 0 throughout the RTS. This commit removes the parameter but leaves the hardcoded profile ID in the functions that emit the encoded eventlog events as to not change the protocol. The affected functions are `traceHeapProfBegin`, `postHeapProfBegin`, `traceHeapProfSampleString`, `postHeapProfSampleString`, `traceHeapProfSampleCostCentre`, and `postHeapProfSampleCostCentre`. - - - - - 76d392a2 by Wen Kokke at 2025-07-16T08:37:04-04:00 Make `traceHeapProfBegin` an init event. - - - - - bbaa44a7 by Peng Fan at 2025-07-16T16:50:42-04:00 NCG/LA64: Support finer-grained DBAR hints For LA664 and newer uarchs, they have made finer granularity hints available: Bit4: ordering or completion (0: completion, 1: ordering) Bit3: barrier for previous read (0: true, 1: false) Bit2: barrier for previous write (0: true, 1: false) Bit1: barrier for succeeding read (0: true, 1: false) Bit0: barrier for succeeding write (0: true, 1: false) And not affect the existing models because other hints are treated as 'dbar 0' there. - - - - - 7da86e16 by Andreas Klebinger at 2025-07-16T16:51:25-04:00 Disable -fprof-late-overloaded-calls for join points. Currently GHC considers cost centres as destructive to join contexts. Or in other words this is not considered valid: join f x = ... in ... -> scc<tick> jmp This makes the functionality of `-fprof-late-overloaded-calls` not feasible for join points in general. We used to try to work around this by putting the ticks on the rhs of the join point rather than around the jump. However beyond the loss of accuracy this was broken for recursive join points as we ended up with something like: rec-join f x = scc<tick> ... jmp f x Which similarly is not valid as the tick once again destroys the tail call. One might think we could limit ourselves to non-recursive tail calls and do something clever like: join f x = scc<tick> ... in ... jmp f x And sometimes this works! But sometimes the full rhs would look something like: join g x = .... join f x = scc<tick> ... -> jmp g x Which, would again no longer be valid. I believe in the long run we can make cost centre ticks non-destructive to join points. Or we could keep track of where we are/are not allowed to insert a cost centre. But in the short term I will simply disable the annotation of join calls under this flag. - - - - - 7ee22fd5 by ARATA Mizuki at 2025-07-17T06:05:30-04:00 x86 NCG: Better lowering for shuffleFloatX4# and shuffleDoubleX2# The new implementation * make use of specialized instructions like (V)UNPCK{L,H}{PS,PD}, and * do not require -mavx. Close #26096 Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> - - - - - c6cd2da1 by Jappie Klooster at 2025-07-17T06:06:20-04:00 Update interact docs to explain about buffering We need to tell the user to set to the appropriate buffer format. Otherwise, this function may get randomly stuck, or just behave confusingly. issue: https://gitlab.haskell.org/ghc/ghc/-/issues/26131 NB, I'm running this with cabal *NOT* ghci. ghci messes with buffering anyway. ```haskell interaction :: String -> String interaction "jappie" = "hi" interaction "jakob" = "hello" interaction x = "unkown input: " <> x main :: IO () main = interact interaction ``` so in my input (prefixed by `>`) I get: ``` > jappie unkown input: jappie ``` we confirmed later this was due to lack of \n matching. Anyway movnig on to more unexpected stuff: ```haskell main :: IO () main = do interact (concatMap interaction . lines) ``` get's stuck forever. actually `^D` (ctrl+d) unstucks it and runs all input as expected. for example you can get: ``` > sdfkds > fakdsf unkown input: sdfkdsunkown input: fakdsf ``` This program works! ```haskell interaction :: String -> String interaction "jappie" = "hi \n" interaction "jakob" = "hello \n" interaction x = "unkown input: " <> x <> "\n" main :: IO () main = do interact (concatMap interaction . lines) ``` the reason is that linebuffering is set for both in and output by default. so lines eats the input lines, and all the \n postfixes make sure the buffer is put out. - - - - - 9fa590a6 by Zubin Duggal at 2025-07-17T06:07:03-04:00 fetch_gitlab: Ensure we copy users_guide.pdf and Haddock.pdf to the release docs directory Fixes #24093 - - - - - cc650b4b by Andrew Lelechenko at 2025-07-17T12:30:24-04:00 Add Data.List.NonEmpty.mapMaybe As per https://github.com/haskell/core-libraries-committee/issues/337 - - - - - 360fa82c by Duncan Coutts at 2025-07-17T12:31:14-04:00 base: Deprecate GHC.Weak.Finalize.runFinalizerBatch https://github.com/haskell/core-libraries-committee/issues/342 - - - - - f4e8466c by Alan Zimmerman at 2025-07-17T12:31:55-04:00 EPA: Update exact printing based on GHC 9.14 tests As a result of migrating the GHC ghc-9.14 branch tests to ghc-exactprint in https://github.com/alanz/ghc-exactprint/tree/ghc-9.14, a couple of discrepancies were picked up - The opening paren for a DefaultDecl was printed in the wrong place - The import declaration level specifiers were not printed. This commit adds those fixes, and some tests for them. The tests brought to light that the ImportDecl ppr instance had not been updated for level specifiers, so it updates that too. - - - - - 8b731e3c by Matthew Pickering at 2025-07-21T13:36:43-04:00 level imports: Fix infinite loop with cyclic module imports I didn't anticipate that downsweep would run before we checked for cyclic imports. Therefore we need to use the reachability function which handles cyclic graphs. Fixes #26087 - - - - - d751a9f1 by Pierre Thierry at 2025-07-21T13:37:28-04:00 Fix documentation about deriving from generics - - - - - 9fcdca15 by Sebastian Graf at 2025-07-22T20:02:01+00:00 CprAnal: Detect recursive newtypes (#25944) While `cprTransformDataConWork` handles recursive data con workers, it did not detect the case when a newtype is responsible for the recursion. This is now detected in the `Cast` case of `cprAnal`. The same reproducer made it clear that `isRecDataCon` lacked congruent handling for `AppTy` and `CastTy`, now fixed. Furthermore, the new repro case T25944 triggered this bug via an infinite loop in `cprFix`, caused by the infelicity in `isRecDataCon`. While it should be much less likely to trigger such an infinite loop now that `isRecDataCon` has been fixed, I made sure to abort the loop after 10 iterations and emitting a warning instead. Fixes #25944. - - - - - 85 changed files: - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/LA64/Instr.hs - compiler/GHC/CmmToAsm/LA64/Ppr.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/Core/LateCC/OverloadedCalls.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/Parser.y - compiler/GHC/Tc/Solver.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/InertSet.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Unit/Module/Graph.hs - configure.ac - docs/users_guide/9.14.1-notes.rst - docs/users_guide/eventlog-formats.rst - docs/users_guide/profiling.rst - libraries/base/changelog.md - libraries/base/src/Data/List/NonEmpty.hs - libraries/base/src/GHC/Generics.hs - libraries/base/src/GHC/Weak/Finalize.hs - libraries/ghc-internal/src/GHC/Internal/System/IO.hs - m4/find_ld.m4 - mk/get-win32-tarballs.py - rts/ProfHeap.c - rts/RetainerSet.c - rts/Trace.c - rts/Trace.h - rts/eventlog/EventLog.c - rts/eventlog/EventLog.h - rts/linker/LoadArchive.c - rts/linker/PEi386.c - rts/sm/NonMoving.c - rts/sm/NonMoving.h - rts/sm/NonMovingAllocate.c - rts/sm/Sanity.c - + testsuite/tests/cpranal/sigs/T25944.hs - + testsuite/tests/cpranal/sigs/T25944.stderr - testsuite/tests/cpranal/sigs/all.T - testsuite/tests/dmdanal/should_compile/T23398.hs - testsuite/tests/dmdanal/should_compile/T23398.stderr - testsuite/tests/driver/recomp015/all.T - 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/perf/should_run/SpecTyFamRun.hs - + testsuite/tests/perf/should_run/SpecTyFamRun.stdout - + testsuite/tests/perf/should_run/SpecTyFam_Import.hs - testsuite/tests/perf/should_run/all.T - testsuite/tests/printer/Makefile - + testsuite/tests/printer/TestLevelImports.hs - + testsuite/tests/printer/TestNamedDefaults.hs - testsuite/tests/printer/all.T - testsuite/tests/rts/all.T - testsuite/tests/rts/linker/T11223/T11223_link_order_a_b_2_fail.stderr-ws-32-mingw32 - testsuite/tests/rts/linker/T11223/T11223_link_order_a_b_2_fail.stderr-ws-64-mingw32 - testsuite/tests/simd/should_run/all.T - + testsuite/tests/simd/should_run/doublex2_shuffle.hs - + testsuite/tests/simd/should_run/doublex2_shuffle.stdout - + testsuite/tests/simd/should_run/doublex2_shuffle_baseline.hs - + testsuite/tests/simd/should_run/doublex2_shuffle_baseline.stdout - + testsuite/tests/simd/should_run/floatx4_shuffle.hs - + testsuite/tests/simd/should_run/floatx4_shuffle.stdout - + testsuite/tests/simd/should_run/floatx4_shuffle_baseline.hs - + testsuite/tests/simd/should_run/floatx4_shuffle_baseline.stdout - + testsuite/tests/simplCore/should_compile/T26051.hs - + testsuite/tests/simplCore/should_compile/T26051.stderr - + testsuite/tests/simplCore/should_compile/T26051_Import.hs - testsuite/tests/simplCore/should_compile/all.T - + testsuite/tests/splice-imports/T26087.stderr - + testsuite/tests/splice-imports/T26087A.hs - + testsuite/tests/splice-imports/T26087B.hs - testsuite/tests/splice-imports/all.T - utils/check-exact/ExactPrint.hs - utils/ghc-toolchain/src/GHC/Toolchain/Tools/Link.hs - utils/haddock/haddock-api/haddock-api.cabal The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9e8a00b7ebc5e28d20d0d30f9cf9d6… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9e8a00b7ebc5e28d20d0d30f9cf9d6… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/romes/step-out-11] 10 commits: cleanup: Move dehydrateCgBreakInfo to Stg2Bc
by Rodrigo Mesquita (＠alt-romes) 22 Jul '25

22 Jul '25

Rodrigo Mesquita pushed to branch wip/romes/step-out-11 at Glasgow Haskell Compiler / GHC Commits: 84d921d8 by Rodrigo Mesquita at 2025-07-21T12:14:55+01:00 cleanup: Move dehydrateCgBreakInfo to Stg2Bc This no longer has anything to do with Core. - - - - - d4b7cf54 by Ben Gamari at 2025-07-21T12:14:55+01:00 rts/Interpreter: Factor out ctoi tuple info tables into data Instead of a massive case let's put this into data which we can reuse elsewhere. - - - - - 0e1bbc4d by Rodrigo Mesquita at 2025-07-21T12:14:55+01:00 rts/Disassembler: Fix spacing of BRK_FUN - - - - - 04e8b22f by Rodrigo Mesquita at 2025-07-22T08:32:55+01:00 debugger: Fix bciPtr in Step-out We need to use `BCO_NEXT` to move bciPtr to ix=1, because ix=0 points to the instruction itself! I do not understand how this didn't crash before. - - - - - f9c45e55 by Rodrigo Mesquita at 2025-07-22T08:32:55+01:00 Makes sure run_BCO has variables directly on top of the stack Instead we kept ctoi_ret frames when entering run_BCO, and the ByteCode generator accounted for the frame header and then slided it off. Now, when run_BCO is called for a case continuation, the return value and free variables are directly on top. - - - - - a44c38a4 by Rodrigo Mesquita at 2025-07-22T16:05:10+01:00 Making stg_ret_*_ stay at the start of the BCO - - - - - 9acb2611 by Rodrigo Mesquita at 2025-07-22T18:34:27+01:00 Actually, do add the ctoi frame header but remove it with static slides always in case conts - - - - - d21e2c6e by Rodrigo Mesquita at 2025-07-22T18:34:27+01:00 Working on making BRK_FUNs for case cont. BCO Remove bad Beautiful Fix... More right-trackking TODO: Test step-out from a continuation which receives an unboxed tuple as an argument Fix again - - - - - 83386a54 by Rodrigo Mesquita at 2025-07-22T18:51:16+01:00 Beautiful again - - - - - 8c0283cd by Rodrigo Mesquita at 2025-07-22T19:10:32+01:00 Almost there - - - - - 13 changed files: - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Runtime/Debugger/Breakpoints.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/StgToByteCode.hs - ghc/GHCi/UI.hs - libraries/ghci/GHCi/Run.hs - rts/Disassembler.c - rts/Interpreter.c - testsuite/tests/count-deps/CountDepsAst.stdout - testsuite/tests/count-deps/CountDepsParser.stdout - testsuite/tests/ghci.debugger/scripts/all.T Changes: ===================================== compiler/GHC/ByteCode/Breakpoints.hs ===================================== @@ -1,4 +1,5 @@ {-# LANGUAGE RecordWildCards #-} +{-# LANGUAGE DerivingStrategies #-} -- | Breakpoint information constructed during ByteCode generation. -- @@ -15,6 +16,7 @@ module GHC.ByteCode.Breakpoints -- ** Internal breakpoint identifier , InternalBreakpointId(..), BreakInfoIndex + , InternalBreakLoc(..) -- * Operations @@ -23,7 +25,7 @@ module GHC.ByteCode.Breakpoints -- ** Source-level information operations , getBreakLoc, getBreakVars, getBreakDecls, getBreakCCS - , getBreakSourceId + , getBreakSourceId, getBreakSourceMod -- * Utils , seqInternalModBreaks @@ -165,7 +167,7 @@ data CgBreakInfo { cgb_tyvars :: ![IfaceTvBndr] -- ^ Type variables in scope at the breakpoint , cgb_vars :: ![Maybe (IfaceIdBndr, Word)] , cgb_resty :: !IfaceType - , cgb_tick_id :: !BreakpointId + , cgb_tick_id :: !(Either InternalBreakLoc BreakpointId) -- ^ This field records the original breakpoint tick identifier for this -- internal breakpoint info. It is used to convert a breakpoint -- *occurrence* index ('InternalBreakpointId') into a *definition* index @@ -173,9 +175,19 @@ data CgBreakInfo -- -- The modules of breakpoint occurrence and breakpoint definition are not -- necessarily the same: See Note [Breakpoint identifiers]. + -- + -- If there is no original tick identifier (that is, the breakpoint was + -- created during code generation), instead refer directly to the SrcSpan + -- we want to use for it. See Note [Internal Breakpoint Locations] } -- See Note [Syncing breakpoint info] in GHC.Runtime.Eval +-- | Breakpoints created during code generation don't have a source-level tick +-- location. Instead, we come up with one ourselves. +-- See Note [Internal Breakpoint Locations] +newtype InternalBreakLoc = InternalBreakLoc SrcSpan + deriving newtype (Eq, Show, NFData, Outputable) + -- | Get an internal breakpoint info by 'InternalBreakpointId' getInternalBreak :: InternalBreakpointId -> InternalModBreaks -> CgBreakInfo getInternalBreak (InternalBreakpointId mod ix) imbs = @@ -196,27 +208,36 @@ assert_modules_match ibi_mod imbs_mod = -- | Get the source module and tick index for this breakpoint -- (as opposed to the module where this breakpoint occurs, which is in 'InternalBreakpointId') -getBreakSourceId :: InternalBreakpointId -> InternalModBreaks -> BreakpointId +getBreakSourceId :: InternalBreakpointId -> InternalModBreaks -> Either InternalBreakLoc BreakpointId getBreakSourceId (InternalBreakpointId ibi_mod ibi_ix) imbs = assert_modules_match ibi_mod (imodBreaks_module imbs) $ let cgb = imodBreaks_breakInfo imbs IM.! ibi_ix in cgb_tick_id cgb +-- | Get the source module for this breakpoint (where the breakpoint is defined) +getBreakSourceMod :: InternalBreakpointId -> InternalModBreaks -> Module +getBreakSourceMod (InternalBreakpointId ibi_mod ibi_ix) imbs = + assert_modules_match ibi_mod (imodBreaks_module imbs) $ + let cgb = imodBreaks_breakInfo imbs IM.! ibi_ix + in case cgb_tick_id cgb of + Left InternalBreakLoc{} -> imodBreaks_module imbs + Right BreakpointId{bi_tick_mod} -> bi_tick_mod + -- | Get the source span for this breakpoint getBreakLoc :: (Module -> IO ModBreaks) -> InternalBreakpointId -> InternalModBreaks -> IO SrcSpan -getBreakLoc = getBreakXXX modBreaks_locs +getBreakLoc = getBreakXXX modBreaks_locs (\(InternalBreakLoc x) -> x) -- | Get the vars for this breakpoint getBreakVars :: (Module -> IO ModBreaks) -> InternalBreakpointId -> InternalModBreaks -> IO [OccName] -getBreakVars = getBreakXXX modBreaks_vars +getBreakVars = getBreakXXX modBreaks_vars (const []) -- | Get the decls for this breakpoint getBreakDecls :: (Module -> IO ModBreaks) -> InternalBreakpointId -> InternalModBreaks -> IO [String] -getBreakDecls = getBreakXXX modBreaks_decls +getBreakDecls = getBreakXXX modBreaks_decls (const []) -- | Get the decls for this breakpoint -getBreakCCS :: (Module -> IO ModBreaks) -> InternalBreakpointId -> InternalModBreaks -> IO (String, String) -getBreakCCS = getBreakXXX modBreaks_ccs +getBreakCCS :: (Module -> IO ModBreaks) -> InternalBreakpointId -> InternalModBreaks -> IO (Maybe (String, String)) +getBreakCCS = getBreakXXX (fmap Just . modBreaks_ccs) (const Nothing) -- | Internal utility to access a ModBreaks field at a particular breakpoint index -- @@ -228,14 +249,17 @@ getBreakCCS = getBreakXXX modBreaks_ccs -- 'ModBreaks'. When the tick module is different, we need to look up the -- 'ModBreaks' in the HUG for that other module. -- +-- When there is no tick module (the breakpoint was generated at codegen), use +-- the function on internal mod breaks. +-- -- To avoid cyclic dependencies, we instead receive a function that looks up -- the 'ModBreaks' given a 'Module' -getBreakXXX :: (ModBreaks -> Array BreakTickIndex a) -> (Module -> IO ModBreaks) -> InternalBreakpointId -> InternalModBreaks -> IO a -getBreakXXX view lookupModule (InternalBreakpointId ibi_mod ibi_ix) imbs = +getBreakXXX :: (ModBreaks -> Array BreakTickIndex a) -> (InternalBreakLoc -> a) -> (Module -> IO ModBreaks) -> InternalBreakpointId -> InternalModBreaks -> IO a +getBreakXXX view viewInternal lookupModule (InternalBreakpointId ibi_mod ibi_ix) imbs = assert_modules_match ibi_mod (imodBreaks_module imbs) $ do let cgb = imodBreaks_breakInfo imbs IM.! ibi_ix case cgb_tick_id cgb of - BreakpointId{bi_tick_mod, bi_tick_index} + Right BreakpointId{bi_tick_mod, bi_tick_index} | bi_tick_mod == ibi_mod -> do let these_mbs = imodBreaks_modBreaks imbs @@ -244,6 +268,8 @@ getBreakXXX view lookupModule (InternalBreakpointId ibi_mod ibi_ix) imbs = -> do other_mbs <- lookupModule bi_tick_mod return $ view other_mbs ! bi_tick_index + Left l -> + return $ viewInternal l -------------------------------------------------------------------------------- -- Instances ===================================== compiler/GHC/CoreToIface.hs ===================================== @@ -44,16 +44,12 @@ module GHC.CoreToIface -- * Other stuff , toIfaceLFInfo , toIfaceBooleanFormula - -- * CgBreakInfo - , dehydrateCgBreakInfo ) where import GHC.Prelude import GHC.StgToCmm.Types -import GHC.ByteCode.Types - import GHC.Core import GHC.Core.TyCon hiding ( pprPromotionQuote ) import GHC.Core.Coercion.Axiom @@ -702,16 +698,6 @@ toIfaceLFInfo nm lfi = case lfi of LFLetNoEscape -> panic "toIfaceLFInfo: LFLetNoEscape" --- Dehydrating CgBreakInfo - -dehydrateCgBreakInfo :: [TyVar] -> [Maybe (Id, Word)] -> Type -> BreakpointId -> CgBreakInfo -dehydrateCgBreakInfo ty_vars idOffSets tick_ty bid = - CgBreakInfo - { cgb_tyvars = map toIfaceTvBndr ty_vars - , cgb_vars = map (fmap (\(i, offset) -> (toIfaceIdBndr i, offset))) idOffSets - , cgb_resty = toIfaceType tick_ty - , cgb_tick_id = bid - } {- Note [Inlining and hs-boot files] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ===================================== compiler/GHC/Linker/Loader.hs ===================================== @@ -58,6 +58,7 @@ import GHCi.RemoteTypes import GHC.Iface.Load import GHCi.Message (ConInfoTable(..), LoadedDLL) +import GHC.ByteCode.Breakpoints import GHC.ByteCode.Linker import GHC.ByteCode.Asm import GHC.ByteCode.Types @@ -1711,8 +1712,10 @@ allocateCCS interp ce mbss let count = 1 + (maybe 0 fst $ IM.lookupMax imodBreaks_breakInfo) let ccs = IM.map (\info -> - fromMaybe (toRemotePtr nullPtr) - (M.lookup (cgb_tick_id info) ccss) + case cgb_tick_id info of + Right bi -> fromMaybe (toRemotePtr nullPtr) + (M.lookup bi ccss) + Left InternalBreakLoc{} -> toRemotePtr nullPtr ) imodBreaks_breakInfo assertPpr (count == length ccs) ===================================== compiler/GHC/Runtime/Debugger/Breakpoints.hs ===================================== @@ -253,8 +253,11 @@ mkBreakpointOccurrences = do let imod = modBreaks_module $ imodBreaks_modBreaks ibrks IntMap.foldrWithKey (\info_ix cgi bmp -> do let ibi = InternalBreakpointId imod info_ix - let BreakpointId tick_mod tick_ix = cgb_tick_id cgi - extendModuleEnvWith (IntMap.unionWith (S.<>)) bmp tick_mod (IntMap.singleton tick_ix [ibi]) + case cgb_tick_id cgi of + Right (BreakpointId tick_mod tick_ix) + -> extendModuleEnvWith (IntMap.unionWith (S.<>)) bmp tick_mod (IntMap.singleton tick_ix [ibi]) + Left _ + -> bmp ) bmp0 (imodBreaks_breakInfo ibrks) -------------------------------------------------------------------------------- @@ -287,7 +290,7 @@ getCurrentBreakModule = do Nothing -> pure Nothing Just ibi -> do brks <- readIModBreaks hug ibi - return $ Just $ bi_tick_mod $ getBreakSourceId ibi brks + return $ Just $ getBreakSourceMod ibi brks ix -> Just <$> getHistoryModule hug (resumeHistory r !! (ix-1)) ===================================== compiler/GHC/Runtime/Eval.hs ===================================== @@ -151,7 +151,7 @@ getHistoryModule :: HUG.HomeUnitGraph -> History -> IO Module getHistoryModule hug hist = do let ibi = historyBreakpointId hist brks <- readIModBreaks hug ibi - return $ bi_tick_mod $ getBreakSourceId ibi brks + return $ getBreakSourceMod ibi brks getHistorySpan :: HUG.HomeUnitGraph -> History -> IO SrcSpan getHistorySpan hug hist = do ===================================== compiler/GHC/StgToByteCode.hs ===================================== @@ -63,7 +63,7 @@ import GHC.StgToCmm.Closure ( NonVoid(..), fromNonVoid, idPrimRepU, assertNonVoidIds, assertNonVoidStgArgs ) import GHC.StgToCmm.Layout import GHC.Runtime.Heap.Layout hiding (WordOff, ByteOff, wordsToBytes) -import GHC.Runtime.Interpreter ( interpreterProfiled ) +import GHC.Runtime.Interpreter ( interpreterProfiled, readIModModBreaks ) import GHC.Data.Bitmap import GHC.Data.FlatBag as FlatBag import GHC.Data.OrdList @@ -99,6 +99,7 @@ import GHC.CoreToIface import Control.Monad.IO.Class import Control.Monad.Trans.Reader (ReaderT(..)) import Control.Monad.Trans.State (StateT(..)) +import Data.Array ((!)) -- ----------------------------------------------------------------------------- -- Generating byte code for a complete module @@ -393,26 +394,30 @@ schemeR_wrk fvs nm original_body (args, body) -- | Introduce break instructions for ticked expressions. -- If no breakpoint information is available, the instruction is omitted. schemeER_wrk :: StackDepth -> BCEnv -> CgStgExpr -> BcM BCInstrList -schemeER_wrk d p (StgTick (Breakpoint tick_ty tick_id fvs) rhs) = do - code <- schemeE d 0 p rhs - mb_current_mod_breaks <- getCurrentModBreaks - case mb_current_mod_breaks of - -- if we're not generating ModBreaks for this module for some reason, we - -- can't store breakpoint occurrence information. - Nothing -> pure code - Just current_mod_breaks -> do - platform <- profilePlatform <$> getProfile - let idOffSets = getVarOffSets platform d p fvs - ty_vars = tyCoVarsOfTypesWellScoped (tick_ty:map idType fvs) - toWord :: Maybe (Id, WordOff) -> Maybe (Id, Word) - toWord = fmap (\(i, wo) -> (i, fromIntegral wo)) - breakInfo = dehydrateCgBreakInfo ty_vars (map toWord idOffSets) tick_ty tick_id - - let info_mod = modBreaks_module current_mod_breaks - infox <- newBreakInfo breakInfo +schemeER_wrk d p (StgTick bp@(Breakpoint tick_ty tick_id fvs) rhs) = do + platform <- profilePlatform <$> getProfile + + code <- case rhs of + -- When we find a tick surrounding a case expression we introduce a new BRK_FUN + -- instruction at the start of the case *continuation*, in addition to the + -- usual BRK_FUN surrounding the StgCase) + -- See Note [TODO] + StgCase scrut bndr _ alts + -> doCase d 0 p (Just bp) scrut bndr alts + _ -> schemeE d 0 p rhs + + let idOffSets = getVarOffSets platform d p fvs + ty_vars = tyCoVarsOfTypesWellScoped (tick_ty:map idType fvs) + toWord :: Maybe (Id, WordOff) -> Maybe (Id, Word) + toWord = fmap (\(i, wo) -> (i, fromIntegral wo)) + breakInfo = dehydrateCgBreakInfo ty_vars (map toWord idOffSets) tick_ty (Right tick_id) + + mibi <- newBreakInfo breakInfo + + return $ case mibi of + Nothing -> code + Just ibi -> BRK_FUN ibi `consOL` code - let breakInstr = BRK_FUN (InternalBreakpointId info_mod infox) - return $ breakInstr `consOL` code schemeER_wrk d p rhs = schemeE d 0 p rhs getVarOffSets :: Platform -> StackDepth -> BCEnv -> [Id] -> [Maybe (Id, WordOff)] @@ -614,7 +619,7 @@ schemeE d s p (StgTick _ rhs) = schemeE d s p rhs schemeE d s p (StgCase scrut _ _ []) = schemeE d s p scrut schemeE d s p (StgCase scrut bndr _ alts) - = doCase d s p scrut bndr alts + = doCase d s p Nothing scrut bndr alts {- @@ -1106,11 +1111,15 @@ doCase :: StackDepth -> Sequel -> BCEnv + -> Maybe StgTickish + -- ^ The breakpoint surrounding the full case expression, if any (only + -- source-level cases get breakpoint ticks, and those are the only we care + -- about). See Note [TODO] -> CgStgExpr -> Id -> [CgStgAlt] -> BcM BCInstrList -doCase d s p scrut bndr alts +doCase d s p m_bid scrut bndr alts = do profile <- getProfile hsc_env <- getHscEnv @@ -1140,43 +1149,34 @@ doCase d s p scrut bndr alts -- When an alt is entered, it assumes the returned value is -- on top of the itbl; see Note [Return convention for non-tuple values] -- for details. - ret_frame_size_b :: StackDepth - ret_frame_size_b | ubx_tuple_frame = - (if profiling then 5 else 4) * wordSize platform - | otherwise = 2 * wordSize platform + ret_frame_size_w :: WordOff + ret_frame_size_w | ubx_tuple_frame = + if profiling then 5 else 4 + | otherwise = 2 -- The stack space used to save/restore the CCCS when profiling save_ccs_size_b | profiling && not ubx_tuple_frame = 2 * wordSize platform | otherwise = 0 - -- The size of the return frame info table pointer if one exists - unlifted_itbl_size_b :: StackDepth - unlifted_itbl_size_b | ubx_tuple_frame = wordSize platform - | otherwise = 0 - (bndr_size, call_info, args_offsets) | ubx_tuple_frame = let bndr_reps = typePrimRep (idType bndr) (call_info, args_offsets) = layoutNativeCall profile NativeTupleReturn 0 id bndr_reps - in ( wordsToBytes platform (nativeCallSize call_info) + in ( nativeCallSize call_info , call_info , args_offsets ) - | otherwise = ( wordsToBytes platform (idSizeW platform bndr) + | otherwise = ( idSizeW platform bndr , voidTupleReturnInfo , [] ) - -- depth of stack after the return value has been pushed + -- Depth of stack after the return value has been pushed + -- This is the stack depth at the continuation. d_bndr = - d + ret_frame_size_b + bndr_size - - -- depth of stack after the extra info table for an unlifted return - -- has been pushed, if any. This is the stack depth at the - -- continuation. - d_alts = d + ret_frame_size_b + bndr_size + unlifted_itbl_size_b + d + wordsToBytes platform bndr_size -- Env in which to compile the alts, not including -- any vars bound by the alts themselves @@ -1188,13 +1188,13 @@ doCase d s p scrut bndr alts -- given an alt, return a discr and code for it. codeAlt :: CgStgAlt -> BcM (Discr, BCInstrList) codeAlt GenStgAlt{alt_con=DEFAULT,alt_bndrs=_,alt_rhs=rhs} - = do rhs_code <- schemeE d_alts s p_alts rhs + = do rhs_code <- schemeE d_bndr s p_alts rhs return (NoDiscr, rhs_code) codeAlt alt@GenStgAlt{alt_con=_, alt_bndrs=bndrs, alt_rhs=rhs} -- primitive or nullary constructor alt: no need to UNPACK | null real_bndrs = do - rhs_code <- schemeE d_alts s p_alts rhs + rhs_code <- schemeE d_bndr s p_alts rhs return (my_discr alt, rhs_code) | isUnboxedTupleType bndr_ty || isUnboxedSumType bndr_ty = let bndr_ty = idPrimRepU . fromNonVoid @@ -1206,7 +1206,7 @@ doCase d s p scrut bndr alts bndr_ty (assertNonVoidIds bndrs) - stack_bot = d_alts + stack_bot = d_bndr p' = Map.insertList [ (arg, tuple_start - @@ -1224,7 +1224,7 @@ doCase d s p scrut bndr alts (addIdReps (assertNonVoidIds real_bndrs)) size = WordOff tot_wds - stack_bot = d_alts + wordsToBytes platform size + stack_bot = d_bndr + wordsToBytes platform size -- convert offsets from Sp into offsets into the virtual stack p' = Map.insertList @@ -1324,22 +1324,53 @@ doCase d s p scrut bndr alts alt_stuff <- mapM codeAlt alts alt_final0 <- mkMultiBranch maybe_ncons alt_stuff - let alt_final1 - | ubx_tuple_frame = SLIDE 0 2 `consOL` alt_final0 - | otherwise = alt_final0 - alt_final - | gopt Opt_InsertBreakpoints (hsc_dflags hsc_env) - -- See Note [Debugger: BRK_ALTS] - = BRK_ALTS False `consOL` alt_final1 - | otherwise = alt_final1 + let + + -- drop the stg_ctoi_*_info header... + alt_final1 = SLIDE bndr_size ret_frame_size_w `consOL` alt_final0 + + -- after dropping the stg_ret_*_info header + alt_final2 + | ubx_tuple_frame = SLIDE 0 3 `consOL` alt_final1 + | otherwise = SLIDE 0 1 `consOL` alt_final1 + + -- when `BRK_FUN` in a case continuation BCO executes, + -- the stack will already have a full continuation that just + -- re-executes the BCO being stopped at (including the stg_ret and + -- stg_ctoi frames) + -- + -- right after the `BRK_FUN`, all case continuations will drop the + -- stg_ret and stg_ctoi headers (see alt_final1, alt_final2), leaving + -- the stack with the bound return values followed by the free variables + alt_final <- case m_bid of + Just (Breakpoint tick_ty tick_id fvs) + | gopt Opt_InsertBreakpoints (hsc_dflags hsc_env) + -- Construct an internal breakpoint to put at the start of this case + -- continuation BCO. + -- See Note [TODO] + -> do + internal_tick_loc <- makeCaseInternalBreakLoc tick_id + + -- same fvs available in the case expression are available in the case continuation + let idOffSets = getVarOffSets platform d p fvs + ty_vars = tyCoVarsOfTypesWellScoped (tick_ty:map idType fvs) + toWord :: Maybe (Id, WordOff) -> Maybe (Id, Word) + toWord = fmap (\(i, wo) -> (i, fromIntegral wo)) + breakInfo = dehydrateCgBreakInfo ty_vars (map toWord idOffSets) tick_ty (Left internal_tick_loc) + + mibi <- newBreakInfo breakInfo + return $ case mibi of + Nothing -> alt_final2 + Just ibi -> BRK_FUN ibi `consOL` alt_final2 + _ -> pure alt_final2 add_bco_name <- shouldAddBcoName let alt_bco_name = getName bndr alt_bco = mkProtoBCO platform add_bco_name alt_bco_name alt_final (Left alts) 0{-no arity-} bitmap_size bitmap True{-is alts-} - scrut_code <- schemeE (d + ret_frame_size_b + save_ccs_size_b) - (d + ret_frame_size_b + save_ccs_size_b) + scrut_code <- schemeE (d + wordsToBytes platform ret_frame_size_w + save_ccs_size_b) + (d + wordsToBytes platform ret_frame_size_w + save_ccs_size_b) p scrut if ubx_tuple_frame then do let tuple_bco = tupleBCO platform call_info args_offsets @@ -1351,6 +1382,24 @@ doCase d s p scrut bndr alts _ -> panic "schemeE(StgCase).push_alts" in return (PUSH_ALTS alt_bco scrut_rep `consOL` scrut_code) +makeCaseInternalBreakLoc :: BreakpointId -> BcM InternalBreakLoc +makeCaseInternalBreakLoc bid = do + hug <- hsc_HUG <$> getHscEnv + curr_mod <- getCurrentModule + mb_mod_brks <- getCurrentModBreaks + + -- TODO: Subtract the scrutinee loc from the case loc to get continuation loc + InternalBreakLoc <$> case bid of + BreakpointId{bi_tick_mod, bi_tick_index} + | bi_tick_mod == curr_mod + , Just these_mbs <- mb_mod_brks + -> do + return $ modBreaks_locs these_mbs ! bi_tick_index + | otherwise + -> do + other_mbs <- liftIO $ readIModModBreaks hug bi_tick_mod + return $ modBreaks_locs other_mbs ! bi_tick_index + {- Note [Debugger: BRK_ALTS] ~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -1718,6 +1767,10 @@ tupleBCO platform args_info args = with using a fake name here. We will need to change this if we want to save some memory by sharing the BCO between places that have the same tuple shape + + ROMES:TODO: This seems like it would have a pretty good impact. + Looking at examples like UnboxedTuple.hs shows many occurrences of the + same tuple_BCO -} invented_name = mkSystemVarName (mkPseudoUniqueE 0) (fsLit "tuple") @@ -2667,14 +2720,19 @@ getLabelsBc n = BcM $ \_ st -> let ctr = nextlabel st in return (coerce [ctr .. ctr+n-1], st{nextlabel = ctr+n}) -newBreakInfo :: CgBreakInfo -> BcM Int -newBreakInfo info = BcM $ \_ st -> - let ix = breakInfoIdx st - st' = st - { breakInfo = IntMap.insert ix info (breakInfo st) - , breakInfoIdx = ix + 1 - } - in return (ix, st') +newBreakInfo :: CgBreakInfo -> BcM (Maybe InternalBreakpointId) +newBreakInfo info = BcM $ \env st -> do + -- if we're not generating ModBreaks for this module for some reason, we + -- can't store breakpoint occurrence information. + case modBreaks env of + Nothing -> pure (Nothing, st) + Just modBreaks -> do + let ix = breakInfoIdx st + st' = st + { breakInfo = IntMap.insert ix info (breakInfo st) + , breakInfoIdx = ix + 1 + } + return (Just $ InternalBreakpointId (modBreaks_module modBreaks) ix, st') getCurrentModule :: BcM Module getCurrentModule = BcM $ \env st -> return (bcm_module env, st) @@ -2684,3 +2742,14 @@ getCurrentModBreaks = BcM $ \env st -> return (modBreaks env, st) tickFS :: FastString tickFS = fsLit "ticked" + +-- Dehydrating CgBreakInfo + +dehydrateCgBreakInfo :: [TyVar] -> [Maybe (Id, Word)] -> Type -> Either InternalBreakLoc BreakpointId -> CgBreakInfo +dehydrateCgBreakInfo ty_vars idOffSets tick_ty bid = + CgBreakInfo + { cgb_tyvars = map toIfaceTvBndr ty_vars + , cgb_vars = map (fmap (\(i, offset) -> (toIfaceIdBndr i, offset))) idOffSets + , cgb_resty = toIfaceType tick_ty + , cgb_tick_id = bid + } ===================================== ghc/GHCi/UI.hs ===================================== @@ -45,7 +45,7 @@ import GHC.Runtime.Eval (mkTopLevEnv) import GHC.Runtime.Eval.Utils -- The GHC interface -import GHC.ByteCode.Breakpoints (imodBreaks_modBreaks, InternalBreakpointId(..), getBreakSourceId) +import GHC.ByteCode.Breakpoints (imodBreaks_modBreaks, InternalBreakpointId(..), getBreakSourceId, getBreakSourceMod) import GHC.Runtime.Interpreter import GHCi.RemoteTypes import GHCi.BreakArray( breakOn, breakOff ) @@ -1621,7 +1621,7 @@ toBreakIdAndLocation (Just inf) = do brks <- liftIO $ readIModBreaks hug inf let bi = getBreakSourceId inf brks return $ listToMaybe [ id_loc | id_loc@(_,loc) <- IntMap.assocs (breaks st), - breakId loc == bi ] + Right (breakId loc) == bi ] printStoppedAtBreakInfo :: GHC.GhcMonad m => Resume -> [Name] -> m () printStoppedAtBreakInfo res names = do @@ -3825,7 +3825,7 @@ pprStopped res = do hug <- hsc_HUG <$> GHC.getSession brks <- liftIO $ readIModBreaks hug ibi return $ Just $ moduleName $ - bi_tick_mod $ getBreakSourceId ibi brks + getBreakSourceMod ibi brks return $ text "Stopped in" <+> ((case mb_mod_name of ===================================== libraries/ghci/GHCi/Run.hs ===================================== @@ -362,6 +362,14 @@ withBreakAction opts breakMVar statusMVar mtid act info_mod_uid <- BS.packCString (Ptr info_mod_uid#) pure (Just (EvalBreakpoint info_mod info_mod_uid (I# infox#))) putMVar statusMVar $ EvalBreak apStack_r breakpoint resume_r ccs + + -- Block until this thread is resumed (by the thread which took the + -- `ResumeContext` from the `statusMVar`). + -- + -- The `onBreak` function must have been called from `rts/Interpreter.c` + -- when interpreting a `BRK_FUN`. After taking from the MVar, the function + -- returns to the continuation on the stack which is where the interpreter + -- was stopped. takeMVar breakMVar resetBreakAction stablePtr = do ===================================== rts/Disassembler.c ===================================== @@ -92,9 +92,9 @@ disInstr ( StgBCO *bco, int pc ) info_wix = BCO_NEXT; np = BCO_GET_LARGE_ARG; debugBelch ("BRK_FUN " ); printPtr( ptrs[p1] ); - debugBelch("%" FMT_Word, literals[info_mod] ); - debugBelch("%" FMT_Word, literals[info_unit_id] ); - debugBelch("%" FMT_Word, info_wix ); + debugBelch(" %" FMT_Word, literals[info_mod] ); + debugBelch(" %" FMT_Word, literals[info_unit_id] ); + debugBelch(" %" FMT_Word, info_wix ); CostCentre* cc = (CostCentre*)literals[np]; if (cc) { debugBelch(" %s", cc->label); ===================================== rts/Interpreter.c ===================================== @@ -207,6 +207,19 @@ See also Note [Width of parameters] for some more motivation. // Perhaps confusingly this still reads a full word, merely the offset is in bytes. #define ReadSpB(n) (*((StgWord*) SafeSpBP(n))) +/* + * SLIDE "n" words "by" words + * a_1 ... a_n, b_1 ... b_by, k + * => + * a_1 ... a_n, k + */ +#define SpSlide(n, by) \ + while(n-- > 0) { \ + SpW(n+by) = ReadSpW(n); \ + } \ + Sp_addW(by); \ + + /* Note [PUSH_L underflow] ~~~~~~~~~~~~~~~~~~~~~~~ BCOs can be nested, resulting in nested BCO stack frames where the inner most @@ -284,6 +297,19 @@ allocate_NONUPD (Capability *cap, int n_words) return allocate(cap, stg_max(sizeofW(StgHeader)+MIN_PAYLOAD_SIZE, n_words)); } +STATIC_INLINE int +is_ctoi_nontuple_frame(const StgClosure* frame) { + const StgInfoTable* info = frame->header.info; + return ( + (W_)info == (W_)&stg_ctoi_R1p_info || + (W_)info == (W_)&stg_ctoi_R1n_info || + (W_)info == (W_)&stg_ctoi_F1_info || + (W_)info == (W_)&stg_ctoi_D1_info || + (W_)info == (W_)&stg_ctoi_L1_info || + (W_)info == (W_)&stg_ctoi_V_info + ); +} + int rts_stop_on_exception = 0; /* --------------------------------------------------------------------------- @@ -473,6 +499,72 @@ void interp_shutdown( void ){ #endif +const StgPtr ctoi_tuple_infos[] = { + (StgPtr) &stg_ctoi_t0_info, + (StgPtr) &stg_ctoi_t1_info, + (StgPtr) &stg_ctoi_t2_info, + (StgPtr) &stg_ctoi_t3_info, + (StgPtr) &stg_ctoi_t4_info, + (StgPtr) &stg_ctoi_t5_info, + (StgPtr) &stg_ctoi_t6_info, + (StgPtr) &stg_ctoi_t7_info, + (StgPtr) &stg_ctoi_t8_info, + (StgPtr) &stg_ctoi_t9_info, + (StgPtr) &stg_ctoi_t10_info, + (StgPtr) &stg_ctoi_t11_info, + (StgPtr) &stg_ctoi_t12_info, + (StgPtr) &stg_ctoi_t13_info, + (StgPtr) &stg_ctoi_t14_info, + (StgPtr) &stg_ctoi_t15_info, + (StgPtr) &stg_ctoi_t16_info, + (StgPtr) &stg_ctoi_t17_info, + (StgPtr) &stg_ctoi_t18_info, + (StgPtr) &stg_ctoi_t19_info, + (StgPtr) &stg_ctoi_t20_info, + (StgPtr) &stg_ctoi_t21_info, + (StgPtr) &stg_ctoi_t22_info, + (StgPtr) &stg_ctoi_t23_info, + (StgPtr) &stg_ctoi_t24_info, + (StgPtr) &stg_ctoi_t25_info, + (StgPtr) &stg_ctoi_t26_info, + (StgPtr) &stg_ctoi_t27_info, + (StgPtr) &stg_ctoi_t28_info, + (StgPtr) &stg_ctoi_t29_info, + (StgPtr) &stg_ctoi_t30_info, + (StgPtr) &stg_ctoi_t31_info, + (StgPtr) &stg_ctoi_t32_info, + (StgPtr) &stg_ctoi_t33_info, + (StgPtr) &stg_ctoi_t34_info, + (StgPtr) &stg_ctoi_t35_info, + (StgPtr) &stg_ctoi_t36_info, + (StgPtr) &stg_ctoi_t37_info, + (StgPtr) &stg_ctoi_t38_info, + (StgPtr) &stg_ctoi_t39_info, + (StgPtr) &stg_ctoi_t40_info, + (StgPtr) &stg_ctoi_t41_info, + (StgPtr) &stg_ctoi_t42_info, + (StgPtr) &stg_ctoi_t43_info, + (StgPtr) &stg_ctoi_t44_info, + (StgPtr) &stg_ctoi_t45_info, + (StgPtr) &stg_ctoi_t46_info, + (StgPtr) &stg_ctoi_t47_info, + (StgPtr) &stg_ctoi_t48_info, + (StgPtr) &stg_ctoi_t49_info, + (StgPtr) &stg_ctoi_t50_info, + (StgPtr) &stg_ctoi_t51_info, + (StgPtr) &stg_ctoi_t52_info, + (StgPtr) &stg_ctoi_t53_info, + (StgPtr) &stg_ctoi_t54_info, + (StgPtr) &stg_ctoi_t55_info, + (StgPtr) &stg_ctoi_t56_info, + (StgPtr) &stg_ctoi_t57_info, + (StgPtr) &stg_ctoi_t58_info, + (StgPtr) &stg_ctoi_t59_info, + (StgPtr) &stg_ctoi_t60_info, + (StgPtr) &stg_ctoi_t61_info, + (StgPtr) &stg_ctoi_t62_info, +}; + #if defined(PROFILING) // @@ -642,13 +734,12 @@ interpretBCO (Capability* cap) ASSERT(get_itbl((StgClosure*)bco)->type == BCO); StgWord16* instrs = (StgWord16*)(bco->instrs->payload); - StgWord16 bci = instrs[0]; + int bciPtr = 0; + StgWord16 bci = BCO_NEXT; /* A breakpoint instruction (BRK_FUN or BRK_ALTS) is always the first * instruction in a BCO */ if ((bci & 0xFF) == bci_BRK_FUN) { - // Define rest of variables used by BCO_* Macros - int bciPtr = 0; W_ arg1_brk_array, arg4_info_index; arg1_brk_array = BCO_GET_LARGE_ARG; @@ -779,7 +870,6 @@ eval_obj: debugBelch("\n\n"); ); -// IF_DEBUG(sanity,checkStackChunk(Sp, cap->r.rCurrentTSO->stack+cap->r.rCurrentTSO->stack_size)); IF_DEBUG(sanity,checkStackFrame(Sp)); switch ( get_itbl(obj)->type ) { @@ -1021,11 +1111,37 @@ do_return_pointer: // Returning to an interpreted continuation: put the object on // the stack, and start executing the BCO. INTERP_TICK(it_retto_BCO); - Sp_subW(1); - SpW(0) = (W_)tagged_obj; - obj = (StgClosure*)ReadSpW(2); + obj = (StgClosure*)ReadSpW(1); ASSERT(get_itbl(obj)->type == BCO); - goto run_BCO_return_pointer; + + // Heap check + if (doYouWantToGC(cap)) { + Sp_subW(2); + SpW(1) = (W_)tagged_obj; + SpW(0) = (W_)&stg_ret_p_info; + RETURN_TO_SCHEDULER(ThreadInterpret, HeapOverflow); + } + else { + + // Stack checks aren't necessary at return points, the stack use + // is aggregated into the enclosing function entry point. + + // Make sure to drop the RET_BCO frame header, + // but not its arguments (which are expected at the top when running the BCO). + // NOTE: Always a return_pointer (ie not a tuple ctoi frame!) + + // Make sure stack is headed by a ctoi nontuple frame then drop it. + // The arguments to the BCO continuation stay on top of the stack + ASSERT(ReadSpW(0) == (W_)&stg_ctoi_R1p_info); + // TODO: NO LONGER NEEDED BC NOW WE KEEP THE FRAMES Sp_addW(2); + + // Plus the return frame on top of the args + Sp_subW(2); + SpW(1) = (W_)tagged_obj; + SpW(0) = (W_)&stg_ret_p_info; + } + + goto run_BCO; default: do_return_unrecognised: @@ -1094,8 +1210,9 @@ do_return_nonpointer: // get the offset of the header of the next stack frame offset = stack_frame_sizeW((StgClosure *)Sp); + StgClosure* next_frame = (StgClosure*)(SafeSpWP(offset)); - switch (get_itbl((StgClosure*)(SafeSpWP(offset)))->type) { + switch (get_itbl(next_frame)->type) { case RET_BCO: // Returning to an interpreted continuation: pop the return frame @@ -1103,8 +1220,74 @@ do_return_nonpointer: // executing the BCO. INTERP_TICK(it_retto_BCO); obj = (StgClosure*)ReadSpW(offset+1); + ASSERT(get_itbl(obj)->type == BCO); - goto run_BCO_return_nonpointer; + + // Heap check + if (doYouWantToGC(cap)) { + RETURN_TO_SCHEDULER(ThreadInterpret, HeapOverflow); + } + else { + // Stack checks aren't necessary at return points, the stack use + // is aggregated into the enclosing function entry point. + +#if defined(PROFILING) + /* + Restore the current cost centre stack if a tuple is being returned. + + When a "simple" unlifted value is returned, the cccs is restored with + an stg_restore_cccs frame on the stack, for example: + + ... + stg_ctoi_D1 + <CCCS> + stg_restore_cccs + + But stg_restore_cccs cannot deal with tuples, which may have more + things on the stack. Therefore we store the CCCS inside the + stg_ctoi_t frame. + + If we have a tuple being returned, the stack looks like this: + + ... + <CCCS> <- to restore, Sp offset <next frame + 4 words> + tuple_BCO + tuple_info + cont_BCO + stg_ctoi_t <- next frame + tuple_data_1 + ... + tuple_data_n + tuple_info + tuple_BCO + stg_ret_t <- Sp + */ + + if(SpW(0) == (W_)&stg_ret_t_info) { + cap->r.rCCCS = (CostCentreStack*)ReadSpW(offset + 4); + } +#endif + /* Drop the RET_BCO header (next_frame), + * but not its arguments (which are expected at the top when running the BCO) + * + * NEVERMINDDDDD JUST KEEP THE FRAMES. + * WRITE NEW NOTE + */ +// W_ n = offset; +// W_ by = is_ctoi_nontuple_frame(next_frame) +// ? 2 // info+bco +// #if defined(PROFILING) +// : 5; // or info+bco+tuple_info+tuple_BCO+CCS +// #else +// : 4; // or info+bco+tuple_info+tuple_BCO +// #endif +// SpSlide(n, by); + + /* Keep the stg_ret_*_info header (i.e. don't drop it) + * See Note [The Stack when running a Case Continuation BCO] + */ + goto run_BCO; + } default: { @@ -1271,8 +1454,8 @@ do_apply: // Ok, we now have a bco (obj), and its arguments are all on the // stack. We can start executing the byte codes. // - // The stack is in one of two states. First, if this BCO is a - // function: + // The stack is in one of two states. First, if this BCO is a + // function // // | .... | // +---------------+ @@ -1289,10 +1472,6 @@ do_apply: // +---------------+ // | fv1 | // +---------------+ - // | BCO | - // +---------------+ - // | stg_ctoi_ret_ | - // +---------------+ // | retval | // +---------------+ // @@ -1310,68 +1489,6 @@ do_apply: // Sadly we have three different kinds of stack/heap/cswitch check // to do: - -run_BCO_return_pointer: - // Heap check - if (doYouWantToGC(cap)) { - Sp_subW(1); SpW(0) = (W_)&stg_ret_p_info; - RETURN_TO_SCHEDULER(ThreadInterpret, HeapOverflow); - } - // Stack checks aren't necessary at return points, the stack use - // is aggregated into the enclosing function entry point. - - goto run_BCO; - -run_BCO_return_nonpointer: - // Heap check - if (doYouWantToGC(cap)) { - RETURN_TO_SCHEDULER(ThreadInterpret, HeapOverflow); - } - // Stack checks aren't necessary at return points, the stack use - // is aggregated into the enclosing function entry point. - -#if defined(PROFILING) - /* - Restore the current cost centre stack if a tuple is being returned. - - When a "simple" unlifted value is returned, the cccs is restored with - an stg_restore_cccs frame on the stack, for example: - - ... - stg_ctoi_D1 - <CCCS> - stg_restore_cccs - - But stg_restore_cccs cannot deal with tuples, which may have more - things on the stack. Therefore we store the CCCS inside the - stg_ctoi_t frame. - - If we have a tuple being returned, the stack looks like this: - - ... - <CCCS> <- to restore, Sp offset <next frame + 4 words> - tuple_BCO - tuple_info - cont_BCO - stg_ctoi_t <- next frame - tuple_data_1 - ... - tuple_data_n - tuple_info - tuple_BCO - stg_ret_t <- Sp - */ - - if(SpW(0) == (W_)&stg_ret_t_info) { - cap->r.rCCCS = (CostCentreStack*)ReadSpW(stack_frame_sizeW((StgClosure *)Sp) + 4); - } -#endif - - if (SpW(0) != (W_)&stg_ret_t_info) { - Sp_addW(1); - } - goto run_BCO; - run_BCO_fun: IF_DEBUG(sanity, Sp_subW(2); @@ -1454,7 +1571,7 @@ run_BCO: switch (bci & 0xFF) { - /* check for a breakpoint on the beginning of a let binding */ + /* check for a breakpoint on the beginning of a BCO */ case bci_BRK_FUN: { W_ arg1_brk_array, arg2_info_mod_name, arg3_info_mod_id, arg4_info_index; @@ -1522,29 +1639,81 @@ run_BCO: rts_stop_next_breakpoint = 0; cap->r.rCurrentTSO->flags &= ~TSO_STOP_NEXT_BREAKPOINT; - // allocate memory for a new AP_STACK, enough to - // store the top stack frame plus an - // stg_apply_interp_info pointer and a pointer to - // the BCO - size_words = BCO_BITMAP_SIZE(obj) + 2; - new_aps = (StgAP_STACK *) allocate(cap, AP_STACK_sizeW(size_words)); - new_aps->size = size_words; - new_aps->fun = &stg_dummy_ret_closure; - - // fill in the payload of the AP_STACK - new_aps->payload[0] = (StgClosure *)&stg_apply_interp_info; - new_aps->payload[1] = (StgClosure *)obj; - - // copy the contents of the top stack frame into the AP_STACK - for (i = 2; i < size_words; i++) - { - new_aps->payload[i] = (StgClosure *)ReadSpW(i-2); + W_ stack_head = ReadSpW(0); + + int is_case_cont_BCO = + stack_head == (W_)&stg_ret_t_info + || stack_head == (W_)&stg_ret_v_info + || stack_head == (W_)&stg_ret_p_info + || stack_head == (W_)&stg_ret_n_info + || stack_head == (W_)&stg_ret_f_info + || stack_head == (W_)&stg_ret_d_info + || stack_head == (W_)&stg_ret_l_info; + + // TODO: WRITE NOTE + if (is_case_cont_BCO) { + + // TODO: WRITE NOTE + // A case cont. BCO is headed by a ret_frame with the returned value + // We need the frame here if we are going to yield to construct a well formed stack + // Then, just afterwards, we SLIDE the header off. This is generated code (see StgToByteCode) + int size_returned_frame = + (stack_head == (W_)&stg_ret_t_info) + ? 2 /* ret_t + tuple_BCO */ + + /* Sp(2) is call_info which records the offset to the next frame + * See also Note [unboxed tuple bytecodes and tuple_BCO] */ + ((ReadSpW(2) & 0xFF)) + : 2; /* ret_* + return value */ + + StgClosure* cont_frame_head + = (StgClosure*)(SpW(size_returned_frame)); + + // stg_ctoi_* + int size_cont_frame = + is_ctoi_nontuple_frame(cont_frame_head) + ? 2 // info+bco +#if defined(PROFILING) + : 5; // or info+bco+tuple_info+tuple_BCO+CCS +#else + : 4; // or info+bco+tuple_info+tuple_BCO +#endif + + // Continuation stack is already well formed, + // so just copy it whole to the AP_STACK + size_words = size_returned_frame + + size_cont_frame; + new_aps = (StgAP_STACK *) allocate(cap, AP_STACK_sizeW(size_words)); + new_aps->size = size_words; + new_aps->fun = &stg_dummy_ret_closure; + + // (1) Fill in the payload of the AP_STACK: + for (i = 0; i < size_words; i++) { + new_aps->payload[i] = (StgClosure *)ReadSpW(i); + } + } + else { + // (1) Allocate memory for a new AP_STACK, enough to store + // the top stack frame plus an stg_apply_interp_info pointer + // and a pointer to the BCO + size_words = BCO_BITMAP_SIZE(obj) + 2; + new_aps = (StgAP_STACK *) allocate(cap, AP_STACK_sizeW(size_words)); + new_aps->size = size_words; + new_aps->fun = &stg_dummy_ret_closure; + + // (1.1) the continuation frame + new_aps->payload[0] = (StgClosure *)&stg_apply_interp_info; + new_aps->payload[1] = (StgClosure *)obj; + + // (1.2.1) copy the args/free vars of the top stack frame into the AP_STACK + for (i = 2; i < size_words; i++) { + new_aps->payload[i] = (StgClosure *)ReadSpW(i-2); + } } // No write barrier is needed here as this is a new allocation SET_HDR(new_aps,&stg_AP_STACK_info,cap->r.rCCCS); - // Arrange the stack to call the breakpoint IO action, and + // (2) Arrange the stack to call the breakpoint IO action, and // continue execution of this BCO when the IO action returns. // // ioAction :: Addr# -- the breakpoint info module @@ -1557,12 +1726,27 @@ run_BCO: ioAction = (StgClosure *) deRefStablePtr ( rts_breakpoint_io_action); - Sp_subW(13); - SpW(12) = (W_)obj; - SpW(11) = (W_)&stg_apply_interp_info; + // (2.1) Construct the continuation to which we'll return in + // this thread after the `rts_breakpoint_io_action` returns. + // + // For case continuation BCOs, the continuation that re-runs + // it is always ready at the start of the BCO. It gets + // dropped soon after if we don't stop there by SLIDEing. + // See Note [TODO] + if (!is_case_cont_BCO) { + Sp_subW(2); // stg_apply_interp_info + StgBCO* + + // (2.1.2) Write the continuation frame (above the stg_ret + // frame if one exists) + SpW(1) = (W_)obj; + SpW(0) = (W_)&stg_apply_interp_info; + } + + // (2.2) The `rts_breakpoint_io_action` call + Sp_subW(11); SpW(10) = (W_)new_aps; - SpW(9) = (W_)False_closure; // True <=> an exception - SpW(8) = (W_)&stg_ap_ppv_info; + SpW(9) = (W_)False_closure; // True <=> an exception + SpW(8) = (W_)&stg_ap_ppv_info; SpW(7) = (W_)arg4_info_index; SpW(6) = (W_)&stg_ap_n_info; SpW(5) = (W_)BCO_LIT(arg3_info_mod_id); @@ -1733,6 +1917,10 @@ run_BCO: Sp_subW(2); SpW(1) = BCO_PTR(o_bco); SpW(0) = (W_)&stg_ctoi_R1p_info; + + // The o_bco expects its arguments (as per the BCO_BITMAP_SIZE) to + // be found on the stack before it. + IF_DEBUG(sanity, checkStackChunk(Sp, cap->r.rCurrentTSO->stackobj->stack+cap->r.rCurrentTSO->stackobj->stack_size);); #if defined(PROFILING) Sp_subW(2); SpW(1) = (W_)cap->r.rCCCS; @@ -1746,6 +1934,8 @@ run_BCO: SpW(-2) = (W_)&stg_ctoi_R1n_info; SpW(-1) = BCO_PTR(o_bco); Sp_subW(2); + + IF_DEBUG(sanity, checkStackChunk(Sp, cap->r.rCurrentTSO->stackobj->stack+cap->r.rCurrentTSO->stackobj->stack_size);); #if defined(PROFILING) Sp_subW(2); SpW(1) = (W_)cap->r.rCCCS; @@ -1759,6 +1949,8 @@ run_BCO: SpW(-2) = (W_)&stg_ctoi_F1_info; SpW(-1) = BCO_PTR(o_bco); Sp_subW(2); + + IF_DEBUG(sanity, checkStackChunk(Sp, cap->r.rCurrentTSO->stackobj->stack+cap->r.rCurrentTSO->stackobj->stack_size);); #if defined(PROFILING) Sp_subW(2); SpW(1) = (W_)cap->r.rCCCS; @@ -1772,6 +1964,8 @@ run_BCO: SpW(-2) = (W_)&stg_ctoi_D1_info; SpW(-1) = BCO_PTR(o_bco); Sp_subW(2); + + IF_DEBUG(sanity, checkStackChunk(Sp, cap->r.rCurrentTSO->stackobj->stack+cap->r.rCurrentTSO->stackobj->stack_size);); #if defined(PROFILING) Sp_subW(2); SpW(1) = (W_)cap->r.rCCCS; @@ -1785,6 +1979,8 @@ run_BCO: SpW(-2) = (W_)&stg_ctoi_L1_info; SpW(-1) = BCO_PTR(o_bco); Sp_subW(2); + + IF_DEBUG(sanity, checkStackChunk(Sp, cap->r.rCurrentTSO->stackobj->stack+cap->r.rCurrentTSO->stackobj->stack_size);); #if defined(PROFILING) Sp_subW(2); SpW(1) = (W_)cap->r.rCCCS; @@ -1798,6 +1994,8 @@ run_BCO: SpW(-2) = (W_)&stg_ctoi_V_info; SpW(-1) = BCO_PTR(o_bco); Sp_subW(2); + + IF_DEBUG(sanity, checkStackChunk(Sp, cap->r.rCurrentTSO->stackobj->stack+cap->r.rCurrentTSO->stackobj->stack_size);); #if defined(PROFILING) Sp_subW(2); SpW(1) = (W_)cap->r.rCCCS; @@ -1811,6 +2009,7 @@ run_BCO: W_ tuple_info = (W_)BCO_LIT(BCO_GET_LARGE_ARG); W_ o_tuple_bco = BCO_GET_LARGE_ARG; + IF_DEBUG(sanity, checkStackChunk(Sp, cap->r.rCurrentTSO->stackobj->stack+cap->r.rCurrentTSO->stackobj->stack_size);); #if defined(PROFILING) SpW(-1) = (W_)cap->r.rCCCS; Sp_subW(1); @@ -1819,82 +2018,11 @@ run_BCO: SpW(-1) = BCO_PTR(o_tuple_bco); SpW(-2) = tuple_info; SpW(-3) = BCO_PTR(o_bco); - W_ ctoi_t_offset; int tuple_stack_words = (tuple_info >> 24) & 0xff; - switch(tuple_stack_words) { - case 0: ctoi_t_offset = (W_)&stg_ctoi_t0_info; break; - case 1: ctoi_t_offset = (W_)&stg_ctoi_t1_info; break; - case 2: ctoi_t_offset = (W_)&stg_ctoi_t2_info; break; - case 3: ctoi_t_offset = (W_)&stg_ctoi_t3_info; break; - case 4: ctoi_t_offset = (W_)&stg_ctoi_t4_info; break; - case 5: ctoi_t_offset = (W_)&stg_ctoi_t5_info; break; - case 6: ctoi_t_offset = (W_)&stg_ctoi_t6_info; break; - case 7: ctoi_t_offset = (W_)&stg_ctoi_t7_info; break; - case 8: ctoi_t_offset = (W_)&stg_ctoi_t8_info; break; - case 9: ctoi_t_offset = (W_)&stg_ctoi_t9_info; break; - - case 10: ctoi_t_offset = (W_)&stg_ctoi_t10_info; break; - case 11: ctoi_t_offset = (W_)&stg_ctoi_t11_info; break; - case 12: ctoi_t_offset = (W_)&stg_ctoi_t12_info; break; - case 13: ctoi_t_offset = (W_)&stg_ctoi_t13_info; break; - case 14: ctoi_t_offset = (W_)&stg_ctoi_t14_info; break; - case 15: ctoi_t_offset = (W_)&stg_ctoi_t15_info; break; - case 16: ctoi_t_offset = (W_)&stg_ctoi_t16_info; break; - case 17: ctoi_t_offset = (W_)&stg_ctoi_t17_info; break; - case 18: ctoi_t_offset = (W_)&stg_ctoi_t18_info; break; - case 19: ctoi_t_offset = (W_)&stg_ctoi_t19_info; break; - - case 20: ctoi_t_offset = (W_)&stg_ctoi_t20_info; break; - case 21: ctoi_t_offset = (W_)&stg_ctoi_t21_info; break; - case 22: ctoi_t_offset = (W_)&stg_ctoi_t22_info; break; - case 23: ctoi_t_offset = (W_)&stg_ctoi_t23_info; break; - case 24: ctoi_t_offset = (W_)&stg_ctoi_t24_info; break; - case 25: ctoi_t_offset = (W_)&stg_ctoi_t25_info; break; - case 26: ctoi_t_offset = (W_)&stg_ctoi_t26_info; break; - case 27: ctoi_t_offset = (W_)&stg_ctoi_t27_info; break; - case 28: ctoi_t_offset = (W_)&stg_ctoi_t28_info; break; - case 29: ctoi_t_offset = (W_)&stg_ctoi_t29_info; break; - - case 30: ctoi_t_offset = (W_)&stg_ctoi_t30_info; break; - case 31: ctoi_t_offset = (W_)&stg_ctoi_t31_info; break; - case 32: ctoi_t_offset = (W_)&stg_ctoi_t32_info; break; - case 33: ctoi_t_offset = (W_)&stg_ctoi_t33_info; break; - case 34: ctoi_t_offset = (W_)&stg_ctoi_t34_info; break; - case 35: ctoi_t_offset = (W_)&stg_ctoi_t35_info; break; - case 36: ctoi_t_offset = (W_)&stg_ctoi_t36_info; break; - case 37: ctoi_t_offset = (W_)&stg_ctoi_t37_info; break; - case 38: ctoi_t_offset = (W_)&stg_ctoi_t38_info; break; - case 39: ctoi_t_offset = (W_)&stg_ctoi_t39_info; break; - - case 40: ctoi_t_offset = (W_)&stg_ctoi_t40_info; break; - case 41: ctoi_t_offset = (W_)&stg_ctoi_t41_info; break; - case 42: ctoi_t_offset = (W_)&stg_ctoi_t42_info; break; - case 43: ctoi_t_offset = (W_)&stg_ctoi_t43_info; break; - case 44: ctoi_t_offset = (W_)&stg_ctoi_t44_info; break; - case 45: ctoi_t_offset = (W_)&stg_ctoi_t45_info; break; - case 46: ctoi_t_offset = (W_)&stg_ctoi_t46_info; break; - case 47: ctoi_t_offset = (W_)&stg_ctoi_t47_info; break; - case 48: ctoi_t_offset = (W_)&stg_ctoi_t48_info; break; - case 49: ctoi_t_offset = (W_)&stg_ctoi_t49_info; break; - - case 50: ctoi_t_offset = (W_)&stg_ctoi_t50_info; break; - case 51: ctoi_t_offset = (W_)&stg_ctoi_t51_info; break; - case 52: ctoi_t_offset = (W_)&stg_ctoi_t52_info; break; - case 53: ctoi_t_offset = (W_)&stg_ctoi_t53_info; break; - case 54: ctoi_t_offset = (W_)&stg_ctoi_t54_info; break; - case 55: ctoi_t_offset = (W_)&stg_ctoi_t55_info; break; - case 56: ctoi_t_offset = (W_)&stg_ctoi_t56_info; break; - case 57: ctoi_t_offset = (W_)&stg_ctoi_t57_info; break; - case 58: ctoi_t_offset = (W_)&stg_ctoi_t58_info; break; - case 59: ctoi_t_offset = (W_)&stg_ctoi_t59_info; break; - - case 60: ctoi_t_offset = (W_)&stg_ctoi_t60_info; break; - case 61: ctoi_t_offset = (W_)&stg_ctoi_t61_info; break; - case 62: ctoi_t_offset = (W_)&stg_ctoi_t62_info; break; - - default: barf("unsupported tuple size %d", tuple_stack_words); + if (tuple_stack_words > 62) { + barf("unsupported tuple size %d", tuple_stack_words); } - + W_ ctoi_t_offset = (W_) ctoi_tuple_infos[tuple_stack_words]; SpW(-4) = ctoi_t_offset; Sp_subW(4); goto nextInsn; @@ -1987,15 +2115,7 @@ run_BCO: case bci_SLIDE: { W_ n = BCO_GET_LARGE_ARG; W_ by = BCO_GET_LARGE_ARG; - /* - * a_1 ... a_n, b_1 ... b_by, k - * => - * a_1 ... a_n, k - */ - while(n-- > 0) { - SpW(n+by) = ReadSpW(n); - } - Sp_addW(by); + SpSlide(n, by); INTERP_TICK(it_slides); goto nextInsn; } ===================================== testsuite/tests/count-deps/CountDepsAst.stdout ===================================== @@ -5,14 +5,9 @@ GHC.Builtin.Types GHC.Builtin.Types.Literals GHC.Builtin.Types.Prim GHC.Builtin.Uniques -GHC.ByteCode.Breakpoints -GHC.ByteCode.Types GHC.Cmm.BlockId GHC.Cmm.CLabel GHC.Cmm.Dataflow.Label -GHC.Cmm.Expr -GHC.Cmm.MachOp -GHC.Cmm.Reg GHC.Cmm.Type GHC.CmmToAsm.CFG.Weight GHC.Core @@ -65,7 +60,6 @@ GHC.Data.FastMutInt GHC.Data.FastString GHC.Data.FastString.Env GHC.Data.FiniteMap -GHC.Data.FlatBag GHC.Data.Graph.Directed GHC.Data.Graph.Directed.Internal GHC.Data.Graph.UnVar @@ -77,7 +71,6 @@ GHC.Data.Maybe GHC.Data.OrdList GHC.Data.OsPath GHC.Data.Pair -GHC.Data.SmallArray GHC.Data.Strict GHC.Data.StringBuffer GHC.Data.TrieMap @@ -111,8 +104,6 @@ GHC.Hs.Pat GHC.Hs.Specificity GHC.Hs.Type GHC.Hs.Utils -GHC.HsToCore.Breakpoints -GHC.HsToCore.Ticks GHC.Iface.Errors.Types GHC.Iface.Ext.Fields GHC.Iface.Flags @@ -182,7 +173,6 @@ GHC.Types.RepType GHC.Types.SafeHaskell GHC.Types.SourceFile GHC.Types.SourceText -GHC.Types.SptEntry GHC.Types.SrcLoc GHC.Types.ThLevelIndex GHC.Types.Tickish ===================================== testsuite/tests/count-deps/CountDepsParser.stdout ===================================== @@ -5,14 +5,9 @@ GHC.Builtin.Types GHC.Builtin.Types.Literals GHC.Builtin.Types.Prim GHC.Builtin.Uniques -GHC.ByteCode.Breakpoints -GHC.ByteCode.Types GHC.Cmm.BlockId GHC.Cmm.CLabel GHC.Cmm.Dataflow.Label -GHC.Cmm.Expr -GHC.Cmm.MachOp -GHC.Cmm.Reg GHC.Cmm.Type GHC.CmmToAsm.CFG.Weight GHC.Core @@ -66,7 +61,6 @@ GHC.Data.FastMutInt GHC.Data.FastString GHC.Data.FastString.Env GHC.Data.FiniteMap -GHC.Data.FlatBag GHC.Data.Graph.Directed GHC.Data.Graph.Directed.Internal GHC.Data.Graph.Directed.Reachability @@ -79,7 +73,6 @@ GHC.Data.Maybe GHC.Data.OrdList GHC.Data.OsPath GHC.Data.Pair -GHC.Data.SmallArray GHC.Data.Strict GHC.Data.StringBuffer GHC.Data.TrieMap @@ -115,10 +108,8 @@ GHC.Hs.Pat GHC.Hs.Specificity GHC.Hs.Type GHC.Hs.Utils -GHC.HsToCore.Breakpoints GHC.HsToCore.Errors.Types GHC.HsToCore.Pmc.Solver.Types -GHC.HsToCore.Ticks GHC.Iface.Errors.Types GHC.Iface.Ext.Fields GHC.Iface.Flags @@ -205,7 +196,6 @@ GHC.Types.RepType GHC.Types.SafeHaskell GHC.Types.SourceFile GHC.Types.SourceText -GHC.Types.SptEntry GHC.Types.SrcLoc GHC.Types.Target GHC.Types.ThLevelIndex ===================================== testsuite/tests/ghci.debugger/scripts/all.T ===================================== @@ -147,7 +147,7 @@ test('T25932', extra_files(['T25932.hs']), ghci_script, ['T25932.script']) # Step out tests test('T26042b', [extra_hc_opts('-O -fno-unoptimized-core-for-interpreter'), extra_files(['T26042b.hs'])], ghci_script, ['T26042b.script']) -test('T26042c', [expect_broken(26042),extra_hc_opts('-O -fno-unoptimized-core-for-interpreter'), extra_files(['T26042c.hs'])], ghci_script, ['T26042c.script']) +test('T26042c', [extra_hc_opts('-O -fno-unoptimized-core-for-interpreter'), extra_files(['T26042c.hs'])], ghci_script, ['T26042c.script']) test('T26042d', [extra_hc_opts('-O -fno-unoptimized-core-for-interpreter'), extra_files(['T26042d.hs'])], ghci_script, ['T26042d.script']) test('T26042e', extra_files(['T26042e.hs']), ghci_script, ['T26042e.script']) test('T26042f1', extra_files(['T26042f.hs', 'T26042f.script']), ghci_script, ['T26042f.script']) # >> is not inlined, so stepout has nowhere to stop View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5da18c2307b56e032a14577806e163… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5da18c2307b56e032a14577806e163… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T26115] 8 commits: level imports: Fix infinite loop with cyclic module imports
by Simon Peyton Jones (＠simonpj) 22 Jul '25

22 Jul '25

Simon Peyton Jones pushed to branch wip/T26115 at Glasgow Haskell Compiler / GHC Commits: 8b731e3c by Matthew Pickering at 2025-07-21T13:36:43-04:00 level imports: Fix infinite loop with cyclic module imports I didn't anticipate that downsweep would run before we checked for cyclic imports. Therefore we need to use the reachability function which handles cyclic graphs. Fixes #26087 - - - - - d751a9f1 by Pierre Thierry at 2025-07-21T13:37:28-04:00 Fix documentation about deriving from generics - - - - - 460ad5b1 by Simon Peyton Jones at 2025-07-22T16:04:11+01:00 Renaming around predicate types .. we were (as it turned out) abstracting over type-class selectors in SPECIALISATION rules! Wibble isEqPred - - - - - 2f87efe4 by Simon Peyton Jones at 2025-07-22T16:04:11+01:00 Refactor of Specialise.hs This patch just tidies up `specHeader` a bit, removing one of its many results, and adding some comments. No change in behaviour. Also add a few more `HasDebugCallStack` contexts. - - - - - 36c79389 by Simon Peyton Jones at 2025-07-22T16:04:11+01:00 Improve treatment of SPECIALISE pragmas -- again! This MR does another major refactor of the way that SPECIALISE pragmas work, to fix #26115, #26116, #26117. * We now /always/ solve forall-constraints in an all-or-nothing way. See Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve This means we might have unsolved quantified constraints, which need to be reported. See `inert_insts` in `getUnsolvedInerts`. * I refactored the short-cut solver for type classes to work by recursively calling the solver rather than by having a little baby solver that kept being not clever enough. See Note [Shortcut solving] in GHC.Tc.Solver.Dict * I totally rewrote the desugaring of SPECIALISE pragmas, again. The new story is in Note [Desugaring new-form SPECIALISE pragmas] in GHC.HsToCore.Binds Both old-form and new-form SPECIALISE pragmas now route through the same function `dsSpec_help`. The tricky function `decomposeRuleLhs` is now used only for user-written RULES, not for SPECIALISE pragmas. * I improved `solveOneFromTheOther` to account for rewriter sets. Previously it would solve a non-rewritten dict from a rewritten one. For equalities we were already dealing with this, in Some incidental refactoring * A small refactor: `ebv_tcvs` in `EvBindsBar` now has a list of coercions, rather than a set of tyvars. We just delay taking the free vars. * GHC.Core.FVs.exprFVs now returns /all/ free vars. Use `exprLocalFVs` for Local vars. Reason: I wanted another variant for /evidence/ variables. * Ues `EvId` in preference to `EvVar`. (Evidence variables are always Ids.) Rename `isEvVar` to `isEvId`. * I moved `inert_safehask` out of `InertCans` and into `InertSet` where it more properly belongs. Compiler-perf changes: * There was a palpable bug (#26117) which this MR fixes in newWantedEvVar, which bypassed all the subtle overlapping-Given and shortcutting logic. (See the new `newWantedEvVar`.) Fixing this but leads to extra dictionary bindings; they are optimised away quickly but they made CoOpt_Read allocate 3.6% more. * Hpapily T15164 improves. * The net compiler-allocation change is 0.0% Metric Decrease: T15164 Metric Increase: CoOpt_Read T12425 - - - - - f60424fa by Simon Peyton Jones at 2025-07-22T16:27:24+01:00 Solve forall-constraints immediately, or not at all This MR refactors the constraint solver to solve forall-constraints immediately, rather than emitting an implication constraint to be solved later. The most immediate motivation was that when solving quantified constraints in SPECIALISE pragmas, we really really don't want to leave behind half- solved implications. Also it's in tune with the approach of the new short-cut solver, which recursively invokes the solver. It /also/ saves quite a bit of plumbing; e.g - The `wl_implics` field of `WorkList` is gone, - The types of `solveSimpleWanteds` and friends are simplified. - An EvFun contains binding, rather than an EvBindsVar ref-cell that will in the future contain bindings. That makes `evVarsOfTerm` simpler. Much nicer. It also improves error messages a bit. All described in Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve. One tiresome point: in the tricky case of `inferConstraintsCoerceBased` we make a forall-constraint. This we /do/ want to partially solve, so we can infer a suitable context. (I'd be quite happy to force the user to write a context, bt I don't want to change behavior.) So we want to generate an /implication/ constraint in `emitPredSpecConstraints` rather than a /forall-constraint/ as we were doing before. Discussed in (WFA3) of the above Note. Incidental refactoring * `GHC.Tc.Deriv.Infer.inferConstraints` was consulting the state monad for the DerivEnv that the caller had just consulted. Nicer to pass it as an argument I think, so I have done that. No change in behaviour. - - - - - f1286410 by Simon Peyton Jones at 2025-07-22T16:27:24+01:00 Remove duplicated code in Ast.hs for evTermFreeVars This is just a tidy up. - - - - - 59d468c6 by Simon Peyton Jones at 2025-07-22T16:27:24+01:00 Small tc-tracing changes only - - - - - 83 changed files: - compiler/GHC/Core.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/Unfold/Make.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Errors/Ppr.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Deriv/Infer.hs - compiler/GHC/Tc/Deriv/Utils.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Solver.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/Solver/InertSet.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Rewrite.hs - compiler/GHC/Tc/Solver/Solve.hs - + compiler/GHC/Tc/Solver/Solve.hs-boot - compiler/GHC/Tc/Solver/Types.hs - compiler/GHC/Tc/TyCl/PatSyn.hs - compiler/GHC/Tc/Types/Constraint.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Validity.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Var.hs - compiler/GHC/Unit/Module/Graph.hs - libraries/base/src/GHC/Generics.hs - testsuite/tests/deriving/should_compile/T20815.hs - testsuite/tests/deriving/should_fail/T12768.stderr - testsuite/tests/deriving/should_fail/T1496.stderr - testsuite/tests/deriving/should_fail/T5498.stderr - testsuite/tests/deriving/should_fail/T7148.stderr - testsuite/tests/deriving/should_fail/T7148a.stderr - testsuite/tests/hiefile/should_run/HieQueries.stdout - testsuite/tests/impredicative/T17332.stderr - testsuite/tests/quantified-constraints/T15290a.stderr - testsuite/tests/quantified-constraints/T19690.stderr - testsuite/tests/quantified-constraints/T19921.stderr - testsuite/tests/quantified-constraints/T21006.stderr - testsuite/tests/roles/should_fail/RolesIArray.stderr - + testsuite/tests/simplCore/should_compile/T26115.hs - + testsuite/tests/simplCore/should_compile/T26115.stderr - + testsuite/tests/simplCore/should_compile/T26116.hs - + testsuite/tests/simplCore/should_compile/T26116.stderr - + testsuite/tests/simplCore/should_compile/T26117.hs - + testsuite/tests/simplCore/should_compile/T26117.stderr - testsuite/tests/simplCore/should_compile/all.T - + testsuite/tests/splice-imports/T26087.stderr - + testsuite/tests/splice-imports/T26087A.hs - + testsuite/tests/splice-imports/T26087B.hs - testsuite/tests/splice-imports/all.T - testsuite/tests/typecheck/should_compile/T12427a.stderr - testsuite/tests/typecheck/should_compile/T23171.hs - testsuite/tests/typecheck/should_compile/TcSpecPragmas.stderr - testsuite/tests/typecheck/should_fail/T14605.hs - testsuite/tests/typecheck/should_fail/T14605.stderr - testsuite/tests/typecheck/should_fail/T15801.stderr - testsuite/tests/typecheck/should_fail/T18640a.stderr - testsuite/tests/typecheck/should_fail/T18640b.stderr - testsuite/tests/typecheck/should_fail/T19627.stderr - testsuite/tests/typecheck/should_fail/T21530b.stderr - testsuite/tests/typecheck/should_fail/T22912.stderr - testsuite/tests/typecheck/should_fail/tcfail174.stderr The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/b2adb18098229b56de3a1a6883ffac… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/b2adb18098229b56de3a1a6883ffac… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T23210] 748 commits: ghc-internal: strict, unboxed src loc ranges
by Ben Gamari (＠bgamari) 22 Jul '25

22 Jul '25

Ben Gamari pushed to branch wip/T23210 at Glasgow Haskell Compiler / GHC Commits: ea458779 by doyougnu at 2024-11-01T18:11:33-04:00 ghc-internal: strict, unboxed src loc ranges - closes: #20449 - See CLC proposal: #55 - - - - - 778ac793 by Kazuki Okamoto at 2024-11-01T18:12:13-04:00 No haddock markup in doctest line - - - - - cf0deeaf by Andreas Klebinger at 2024-11-02T17:54:52-04:00 Reword -fexpose-overloaded-unfoldings docs. This should make them slightly clearer. Fixes #24844 Co-authored-by: Sylvain Henry <sylvain(a)haskus.fr> - - - - - 1c21e7d4 by Andreas Klebinger at 2024-11-02T17:55:29-04:00 Compile T25062 simd tests even if we can't run them. Helps avoid them being utterly broken. Fixes #25341 - - - - - 573cad4b by Cheng Shao at 2024-11-02T17:56:04-04:00 Remove unused USE_REPORT_PRELUDE code paths from the tree This patch removes unused `USE_REPORT_PRELUDE` code paths from the tree. They have been present since the first git revision 4fb94ae5e5d632748fa2e6c35e259eccc5a1a3f4, and might have been useful for debugging purposes many years ago, but these code paths are never actually built. Removing these ease maintenance of relevant modules in the future, and also allows us to get rid of `CPP` extension in those modules as a nice byproduct. - - - - - 97f600c6 by Hassan Al-Awwadi at 2024-11-04T15:52:12+00:00 Refactored BooleanFormula to be in line with TTG (#21592) There are two parts to this commit. * We moved the definition of BooleanFormula over to L.H.S.BooleanFormula * We parameterized the BooleanFormula over the pass The GHC specific details of BooleanFormula remain in Ghc.Data.BooleanFormula. Because its parameterized over the pass its no longer a functor or traversable, but we defined bfMap and bfTraverse for the cases where we needed fmap and traverse originally. Most other changes are just churn. ------------------------- Metric Decrease: MultiLayerModulesTH_OneShot ------------------------- - - - - - d4fd3580 by Andreas Klebinger at 2024-11-05T07:36:16-05:00 ghc-heap: Fix incomplete selector warnings. Use utility functions instead of selectors to read partial attributes. Part of fixing #25380. - - - - - fdd9f62a by Peter Trommler at 2024-11-05T07:36:51-05:00 PPC NCG: Implement fmin and fmax - - - - - 8e217256 by Mike Pilgrem at 2024-11-07T04:34:20-05:00 Re CLC #293 - Don't specify Data.List.NonEmpty in terms of partial See https://github.com/haskell/core-libraries-committee/issues/293 `List.init` had already been driven out of `tails1` by 21fc180bec93d964a7f4ffdf2429ef6f74b49ab6 but this specification also avoided partial `fromList`, so I preferred it. The `changelog.md` for `base` is updated, with an entry added under `base-4.22.0.0`. - - - - - 346e4cd1 by Zubin Duggal at 2024-11-07T04:34:57-05:00 release: copy zip files into the correct directory Fixes #25446 - - - - - bbdbe225 by Zubin Duggal at 2024-11-07T04:34:57-05:00 release: Sign .gz bindists too Fixes #25447 - - - - - 0c722e14 by Hécate Kleidukos at 2024-11-07T04:35:37-05:00 hadrian: Enforce the usage of GHC >=9.8.1 for ghci-multi GHC 9.6 no good when it comes to multi-repl stuff, despite being well within the range of n-2 releases for bootstrapping, when the script was adapted to load haddock, in !12851 - - - - - d8f8a1c3 by Sylvain Henry at 2024-11-07T19:27:46-05:00 Handle the special ghc-prim:GHC.Prim module in the compiler Before this patch, some custom hacks were necessary in ghc-prim's Setup.hs to register the GHC.Prim (virtual) module and in Hadrian to generate haddocks properly. In this patch we special-case this module in the compiler itself instead (which it already is, see ghcPrimIface in GHC.Iface.Load). From Cabal/Hadrian's perspective GHC.Prim is now just a normal autogenerated module. This simplification is worthwhile on its own. It was found while looking into the work needed for #24453 which aims to merge ghc-prim, ghc-bignum, and ghc-internal. It's also one step closer to remove ghc-prim's custom setup. - - - - - a55adc8e by Cheng Shao at 2024-11-07T19:28:22-05:00 Clean up obsolete CPP guarded code paths from the tree This patch cleans up obsolete CPP guarded code paths from the tree. The minimum supported boot GHC version is 9.6, and all the pre-9.6 era code paths can be removed. - - - - - 9ede97f3 by Cheng Shao at 2024-11-07T19:28:58-05:00 Remove obsolete executable wrappers from the tree The executable wrappers are handled by hadrian and bindist Makefile. The various .wrapper scripts in the tree are unused since removal of Make build system, so this patch removes them all. - - - - - 7d42b2df by tristian at 2024-11-07T19:29:40-05:00 TcRnDuplicateDecls now suggests to use the DuplicateRecordFields extension. Fixes: !24627 - - - - - e56ed179 by Zubin Duggal at 2024-11-11T15:16:35+05:30 testsuite: normalise some versions in callstacks (cherry picked from commit f230e29f30d0c1c566d4dd251807fcab76a2710e) - - - - - a28fc903 by Zubin Duggal at 2024-11-11T15:16:35+05:30 testsuite: use -fhide-source-paths to normalise some backpack tests (cherry picked from commit b19de476bc5ce5c7792e8af1354b94a4286a1a13) - - - - - ed16d303 by Zubin Duggal at 2024-11-11T15:16:36+05:30 testsuite/haddock: strip version identifiers and unit hashes from html tests (cherry picked from commit fbf0889eadc410d43dd5c1657e320634b6738fa5) - - - - - e45e5836 by Zubin Duggal at 2024-11-11T15:16:36+05:30 haddock: oneshot tests can drop files if they share modtimes. Stop this by including the filename in the key. Ideally we would use `ghc -M` output to do a proper toposort Partially addresses #25372 (cherry picked from commit e78c7ef96e395f1ef41f04790aebecd0409b92b9) - - - - - 9104e6eb by Zubin Duggal at 2024-11-11T15:16:36+05:30 testsuite: fix normalisation of T9930fail so that it doesn't get tripped up by ghc executable (ARGV[0]) differences (cherry picked from commit a79a587e025d42d34bb30e115fc5c7cab6c1e030) - - - - - 2c31264a by Zubin Duggal at 2024-11-11T15:16:36+05:30 testsuite: normalise windows file seperators (cherry picked from commit f858875e03b9609656b542aaaaff85ad0a83878a) - - - - - 2807f91b by Zubin Duggal at 2024-11-11T15:21:30+05:30 testsuite: Also match <VERSION> placeholders when normalising callsites - - - - - c02add17 by Ben Gamari at 2024-11-12T01:22:11-05:00 configure: Check version number validity Here we verify the previously informal invariant that stable release version numbers must have three components, preventing costly failed releases. Specifically, the check fails in the following scenarios: * `version=9.13` while `RELEASE=YES` since this would imply a release made from an unstable branch * `version=9.13.0` since unstable versions should only have two components * `version=9.12` since this has the wrong number of version components for a stable branch Fixes #25390. - - - - - 747fd322 by Teo Camarasu at 2024-11-12T01:22:49-05:00 docs: link to #14474 in the template-haskell docs - - - - - 6d96bb62 by Zubin Duggal at 2024-11-12T01:23:25-05:00 testsuite: normalise execvp vs exec differences in process tests Fixes #25431 - - - - - 502e6711 by Torsten Schmits at 2024-11-12T01:24:01-05:00 fix test lint that accumulated while the checks were broken I didn't fix the issues flagged by the #ifdef linter because it were so many that it seemed like the rule has become obsolete. - - - - - 223a4cb5 by Torsten Schmits at 2024-11-12T01:24:02-05:00 test driver: fix file collection for regex linters When a testsuite linter is executed with the `tracked` strategy, the driver runs `git ls-tree` to collect eligible files. This appears to have ceased producing any paths – `ls-tree` restricts its results to the current working directory, which is `testsuite/tests/linters` in this case. As a quick fix, this patch changes the working directory to match expectations. - - - - - 9ad9ac63 by Alan Zimmerman at 2024-11-12T01:24:39-05:00 EPA: Capture location of '_' for wild card type binder And keep track of promotion status in HsExplicitTupleTy, so the round-trip ppr test works for it. Updates Haddock output too, using the PromotionFlag in HsExplicitTupleTy. Closes #25454 - - - - - c37b96fa by Cheng Shao at 2024-11-12T01:25:15-05:00 wasm: fix setImmediate() implementation for Cloudflare Workers This patch fixes setImmediate() implementation for Cloudflare Workers in the wasm backend's js prelude script. Cloudflare Workers doesn't support the MessageChannel API, and we use a setTimeout() based fallback implementation in this case. - - - - - bea8ea4c by Cheng Shao at 2024-11-12T01:25:15-05:00 wasm: fix FinalizationRegistry logic for Cloudflare Workers This patch fixes FinalizationRegistry related logic for Cloudflare Workers in wasm backend js post linker. Cloudflare Workers doesn't support FinalizationRegistry, in this case we use a dummy implementation that doesn't do anything. - - - - - 00d551bf by Cheng Shao at 2024-11-13T08:48:21-05:00 Remove obsolete cross-port script This patch removes the obsolete cross-port script in the tree. The script was based on the legacy Make build system which has been pruned from the tree long ago. For hadrian, proper support for two-stage bootstrapping onto a new unsupported platform is a work in progress in !11444. - - - - - 75a2eae4 by Cheng Shao at 2024-11-13T08:48:58-05:00 hadrian: fix bindist makefile for wasm32-wasi target This patch fixes one incoherent place between bindist makefile and hadrian logic: I forgot to include wasi/wasm32 in OsSupportsGHCi/ArchSupportsGHCi as well. And this results in incorrect settings file generated after installing the bindist, and "Use interpreter"/"Have interpreter" fields incorrectly have "NO" values where they should be "YES" like --info output of in-tree version. - - - - - 0614abef by Alan Zimmerman at 2024-11-13T08:49:34-05:00 EPA: Correctly capture leading semis in decl list Closes #25467 - - - - - 00d58ae1 by Sebastian Graf at 2024-11-13T15:21:23-05:00 DmdAnal: Make `prompt#` lazy (#25439) This applies the same treatment to `prompt#` as for `catch#`. See `Note [Strictness for mask/unmask/catch/prompt]`. Fixes #25439. - - - - - 93233a66 by Ben Gamari at 2024-11-13T15:21:59-05:00 boot: Do not attempt to update config.sub While Apple ARM hardware was new we found that the autoconf scripts included in some boot packages were too old. As a mitigation for this, we introduced logic in the `boot` script to update the `config.sub` with that from the GHC tree. However, this causes submodules which have `config.sub` committted to appear to be dirty. This is a considerable headache. Now since `config.sub` with full platform support is more common we can remove `boot`'s `config.sub` logic. Fixes #19574. - - - - - fa66fa64 by Ryan Scott at 2024-11-14T19:05:00-05:00 Add regression test for #16234 Issue #16234 was likely fixed by !9765. This adds a regression test to ensure that it remains fixed. Fixes #16234. - - - - - bfe64df8 by Matthew Pickering at 2024-11-14T19:05:36-05:00 ghc-internal: Update to Unicode 16 This patch updates the automatically generated code for querying unicode properties to unicode 16. Fixes #25402 - - - - - 1fd83f86 by Ben Gamari at 2024-11-14T19:06:13-05:00 configure: Accept happy-2.1.2 happy-2.1 was released in late Oct 2024. I have confirmed that master bootstraps with it. Here we teach configure to accept this tool. Fixes #25438. - - - - - aa58fc5b by Ben Gamari at 2024-11-14T19:06:49-05:00 rts: Tighten up invariants of PACK - - - - - 8aa4c10a by Ben Gamari at 2024-11-14T19:06:49-05:00 testsuite: Fix badly escaped literals Use raw string literals to ensure that `\s` is correctly interpreted as a character class. - - - - - 0e084029 by Ben Gamari at 2024-11-14T19:06:49-05:00 rts: Improve documentation of SLIDE bytecode instruction - - - - - 9bf3663b by Ben Gamari at 2024-11-14T19:06:49-05:00 rts/Interpreter: Assert that TEST*_P discriminators are valid - - - - - 1f668511 by Ben Gamari at 2024-11-14T19:06:49-05:00 rts/Interpreter: Improve documentation of TEST*_P instructions - - - - - 59e0a770 by Cheng Shao at 2024-11-14T19:07:25-05:00 misc: improve clangd compile_flags.txt flags This patch improves the compile_flags.txt config used to power clangd for the rts C codebase. The flags in the file are sampled & deduped from a real stage1 build with clang-19 and vastly improves the IDE accuracy when hacking the rts. For maximum code coverage under the default settings, compile_flags.txt defaults to threaded+profiled+dynamic+debug way. This does not mean profdyn needs to be actually built in _build/stage1 for IDE to work. To activate IDE for other RTS ways, simply remove one of the -D flags at the end of compile_flags.txt and restart clangd. - - - - - c2c562e0 by Ben Gamari at 2024-11-14T19:08:01-05:00 testsuite: Don't consider untracked files in dirtiness check Considering trees containing untracked files as dirty is a bridge too far. The chance of an untracked file significantly affecting measured performanced metrics is quite small whereas not collecting measurements is quite inconvenient for some workflows. We now ignore untracked files in the dirtiness check. Fixes #25471. - - - - - ed2ed6c5 by Cheng Shao at 2024-11-14T19:08:37-05:00 testsuite: add regression test T25473 This commit adds regression test T25473 marked as broken due to #25473. It will be fixed in the subsequent commit. - - - - - bd0a8b7e by Cheng Shao at 2024-11-14T19:08:37-05:00 wasm: fix foreign import javascript "wrapper" in TH/ghci This patch fixes foreign import javascript "wrapper" in wasm backend's TH/ghci by fixing the handling of dyld/finalization_registry magic variables. Fixes T25473 and closes #25473. - - - - - f1b0bc32 by Ben Gamari at 2024-11-14T19:09:13-05:00 rts/linker: Make FreeBSD declarations proper prototypes The iconv declarations for FreeBSD were previously not prototypes, leading to warnings. - - - - - 086cbbc1 by Ben Gamari at 2024-11-14T19:09:13-05:00 base: Drop redundant import in FreeBSD ExecutablePath implementation - - - - - 79ecd199 by Ben Gamari at 2024-11-14T19:09:13-05:00 compiler: Fix partial selector warnings in GHC.Runtime.Heap.Inspect - - - - - 1acb73bf by Andrew Lelechenko at 2024-11-15T06:10:47-05:00 gitlab: mention CLC in MR template - - - - - 8f2e0832 by Ben Gamari at 2024-11-15T06:11:24-05:00 rts: Allow use of GNU-stack notes on FreeBSD Previously we gated use of GNU-style non-executable stack notes to only apply on Linux. However, these are also supported by FreeBSD, which also uses ELF. Fix this. Fixes #25475. - - - - - 2c427cb0 by Ben Gamari at 2024-11-16T05:27:40-05:00 rts: Fix EINTR check in timerfd ticker When `poll` failed we previously checked that `errno == -EINTR` to silence the failure warning. However, this is wrong as `errno` values are generally not negated error codes (in contrast to many system call results, which is likely what the original author had in mind). Fixes #25477. - - - - - a0fa4941 by Ben Gamari at 2024-11-16T05:28:16-05:00 rts: Increase gen_workspace alignment to 128 bytes on AArch64 Increase to match the 128-byte cache-line size of Apple's ARMv8 implementation. Closes #25459. - - - - - 142d8afa by Ben Gamari at 2024-11-16T16:20:47-05:00 rts/RtsFlags: Refactor size parsing This makes a number of improvements mentioned in #20201: * fail if the argument cannot be parsed as a number (`-Mturtles`) * fail if an unrecognized unit is given (e.g. `-M1x`) - - - - - b7a146e5 by Ben Gamari at 2024-11-16T16:20:47-05:00 testsuite: Add tests for RTS flag parsing error handling See #20201. - - - - - ddb7afa6 by Ben Gamari at 2024-11-16T16:21:23-05:00 users guide: Mention language extensions in equality constraints discussion As suggested in #24127, mention the language extensions necessary for usage of equality constriants in their documentation. Closes #24127. - - - - - 36133dac by Ben Gamari at 2024-11-16T16:21:23-05:00 users-guide/9.14.1-notes: Fix list syntax - - - - - 888de658 by Ben Gamari at 2024-11-16T16:21:23-05:00 users-guide/debug-info: Fix duplicate flag descriptions - - - - - f120e427 by Ben Gamari at 2024-11-16T16:21:23-05:00 users-guide: Fix reference to 9.14.1 release notes - - - - - 8e975032 by Ben Gamari at 2024-11-16T16:21:59-05:00 Introduce GHC.Tc.Plugin.lookupTHName This makes it significantly more convenient (and less GHC-version-dependent) to resolve a template-haskell name into a GHC Name. As proposed in #24741. - - - - - a0e168ec by ARATA Mizuki at 2024-11-16T16:22:40-05:00 x86 NCG SIMD: Lower packFloatX4#, insertFloatX4# and broadcastFloatX4# to SSE1 instructions Fixes #25441 Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> - - - - - 3936bf1b by sheaf at 2024-11-16T16:23:22-05:00 X86 NCG: allow VXOR at scalar floating-point types The NCG can emit VXOR instructions at scalar floating-point types, but the pretty-printer would panic instead of emitting the appropriate VXORPS/VXORPD instructions. This patch rectifies that oversight. Fixes #25455 - - - - - d9dff93a by Ben Gamari at 2024-11-16T16:23:58-05:00 rts: Fix platform-dependent pointer casts Previously we had unnecessary (and incorrect) platform-dependent casts to turn `OSThreadIds`s into a integer. We now just uniformly cast first to a `uintptr_t` (which is always safe, regardless of whether `OSThreadId` is a pointer), and then cast to the desired integral type. This fixes a warning on musl platforms. - - - - - 6d95cdb8 by Ben Gamari at 2024-11-16T16:24:34-05:00 testsuite: Mark encoding004 as broken on FreeBSD Due to #22003, CP936 fails to roundtrip: ```diff == CP936 +Failed to roundtrip given mutant byte at index 891 (251 /= 123 at index 891) +Failed to roundtrip given mutant byte at index 1605 (197 /= 69 at index 1605) +Failed to roundtrip given mutant byte at index 2411 (235 /= 107 at index 2411) +Failed to roundtrip given mutant byte at index 6480 (208 /= 80 at index 6480) +Failed to roundtrip given mutant byte at index 6482 (210 /= 82 at index 6482) +Failed to roundtrip given mutant byte at index 6484 (212 /= 84 at index 6484) +Failed to roundtrip given mutant byte at index 6496 (224 /= 96 at index 6496) +Failed to roundtrip given mutant byte at index 7243 (203 /= 75 at index 7243) +Failed to roundtrip given mutant byte at index 7277 (237 /= 109 at index 7277) +Failed to roundtrip given mutant byte at index 8027 (219 /= 91 at index 8027) +Failed to roundtrip given mutant byte at index 8801 (225 /= 97 at index 8801) ``` - - - - - 26e86984 by Ben Gamari at 2024-11-18T04:05:31-05:00 hadrian: Allow haddock options to be passed via key-value settings - - - - - 6e68b117 by Matthew Pickering at 2024-11-18T04:06:07-05:00 Exception rethrowing Basic changes: * Change `catch` function to propagate exceptions using the WhileHandling mechanism. * Introduce `catchNoPropagate`, which does the same as before, but passes an exception which can be rethrown. * Introduce `rethrowIO` combinator, which rethrows an exception with a context and doesn't add a new backtrace. * Introduce `tryWithContext` for a variant of `try` which can rethrow the exception with it's original context. * onException is modified to rethrow the original error rather than creating a new callstack. * Functions which rethrow in GHC.Internal.IO.Handle.FD, GHC.Internal.IO.Handle.Internals, GHC.Internal.IO.Handle.Text, and GHC.Internal.System.IO.Error are modified to not add a new callstack. Implements CLC proposal#202 <https://github.com/haskell/core-libraries-committee/issues/202> - - - - - a4e0d235 by Rodrigo Mesquita at 2024-11-18T04:06:07-05:00 exceptions: Improve the message layout as per #285 This commit fixes the layout of the additional information included when displaying an exception, namely the type of the exception. It also fixes the default handler's heading message to work well together with the improved display message of SomeException. CLC proposal#285 - - - - - 284ffab3 by Rodrigo Mesquita at 2024-11-18T04:06:07-05:00 Display type and callstack of exception on handler This commit changes the Exception instance of SomeException to *simply* display the underlying exception in `displayException`. The augmented exception message that included the type and backtrace of the exception are now only printed on a call to `displayExceptionWithInfo`. At a surface level, existing programs should behave the same since the `uncaughtExceptionHandler`, which is responsible for printing out uncaught exceptions to the user, will use `displayExceptionWithInfo` by default. However, unlike the instance's `displayException` method, the `uncaughtExceptionHandler` can be overriden with `setUncaughtExceptionHandler`. This makes the extra information opt-in without fixing it the instance, which can be valuable if your program wants to display uncaught exceptions to users in a user-facing way (ie without backtraces). This is what was originally agreed for CLC#231 or CLC#261 with regard to the type of the exception information. The call stack also becoming part of the default handler rather than the Exception instance is an ammendment to CLC#164. Discussion of the ammendment is part of CLC#285. - - - - - 36cddd2c by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00 Remove redundant CallStack from exceptions Before the exception backtraces proposal was implemented, ErrorCall accumulated its own callstack via HasCallStack constraints, but ExceptionContext is now accumulated automatically. The original ErrorCall mechanism is now redundant and we get a duplicate CallStack Updates Cabal submodule to fix their usage of ErrorCallWithLocation to ErrorCall CLC proposal#285 Fixes #25283 - - - - - 7a74330b by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00 Freeze call stack in error throwing functions CLC proposal#285 - - - - - 3abf31a4 by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00 De-duplicate displayContext and displayExceptionContext The former was unused except for one module where it was essentially re-defining displayExceptionContext. Moreover, this commit extends the fix from bfe600f5bb3ecd2c8fa71c536c63d3c46984e3f8 to displayExceptionContext too, which was missing. - - - - - c0d783f8 by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00 Re-export NoBacktrace from Control.Exception This was originally proposed and accepted in section "2.7 Capturing Backtraces on Exceptions" of the CLC proposal for exception backtraces. However, the implementation missed this re-export, which this commit now fixes. - - - - - 802b5c3e by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00 Fix exception backtraces from GHCi When running the program with `runhaskell`/`runghc` the backtrace should match the backtrace one would get by compiling and running the program. But currently, an exception thrown in a program interpreted with `runhaskell` will: * Not include the original exception backtrace at all * Include the backtrace from the internal GHCi/ghc rethrowing of the original exception This commit fixes this divergence by not annotating the ghc(i) backtrace (with NoBacktrace) and making sure that the backtrace of the original exception is serialized across the boundary and rethrown with the appropriate context. Fixes #25116 The !13301 MR (not this commit in particular) improves performance of MultiLayerModules. Unfortunately, T3294 regresses on aarch64-linux-deb12 by 1% allocations. Since this patch must be merged for 9.12 ASAP, we will not be able to investigate the slight regression on this platform in time. ------------------------- Metric Decrease: MultiLayerModulesRecomp MultiLayerModulesTH_OneShot Metric Increase: T3294 ------------------------- - - - - - 3e89eb65 by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00 base: Add to changelog.md CLC #285 - - - - - d9326a48 by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00 Bump array and stm submodules for testsuite The testsuites of array and stm had to be updated according to !13301. Updates submodule array and stm. - - - - - 325fcb5d by Ben Gamari at 2024-11-18T04:06:45-05:00 rts/adjustor: Clean up code style of Nativei386 adjustor - - - - - 39bb6e58 by Ben Gamari at 2024-11-18T04:06:45-05:00 rts/adjustor: Fix stack overrun error in Nativei386 adjustor We were reserving the wrong kind of adjustor context (the generic `AdjustorContext` used by other adjustor implementations, rather than the i386-specific `CCallContext`) to return the adjustor context while freeing, resulting in #25485. Fixes #25485. - - - - - 831aab22 by sheaf at 2024-11-18T21:22:36-05:00 Include diagnostic reason in -fdiagnostics-as-json This commit ensures that the -fdiagnostics-as-json output includes the diagnostic reason. This allows the full error message produced by GHC to be re-constructed from the JSON output. Fixes #25403 - - - - - 3e5bfdd3 by Ben Gamari at 2024-11-18T21:23:12-05:00 rts: Introduce printIPE This is a convenience utility for use in GDB. - - - - - 44d909a3 by Sjoerd Visscher at 2024-11-19T14:38:24-05:00 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. - - - - - 64c95292 by Sjoerd Visscher at 2024-11-19T14:38:24-05:00 Concentrate boot extension logic in Finder With new mkHomeModLocation that takes an extra HscSource to add boot extensions if required. - - - - - 11bad98d by ARATA Mizuki at 2024-11-19T14:39:08-05:00 Better documentation for floating-point min/max and SIMD primitives See #25350 for floating-point min/max Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> - - - - - 791a47b2 by Arnaud Spiwack at 2024-11-20T14:00:05+00:00 Add test for #25185 - - - - - 374e18e5 by Arnaud Spiwack at 2024-11-20T14:09:30+00:00 Quick look: emit the multiplicity of app heads in tcValArgs Otherwise it's not scaled properly by the context, allowing unsound expressions. Fixes #25185. - - - - - 1fc02399 by sheaf at 2024-11-20T18:11:03-05:00 x86 NCG: fix regUsageOfInstr for VMOVU & friends This commit fixes the implementation of 'regUsageOfInstr' for vector operations that take an 'Operand' as the destination, by ensuring that when the destination is an address then the address should be *READ*, and not *WRITTEN*. Getting this wrong is a disaster, as it means the register allocator has incorrect information, which can lead to it discard stores to registers, segfaults ensuing. Fixes #25486 - - - - - 7bd407a6 by Brandon Chinn at 2024-11-21T14:08:15-05:00 Fix CRLF in multiline strings (#25375) - - - - - 7575709b by Rodrigo Mesquita at 2024-11-21T14:08:52-05:00 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 ------------------------- - - - - - bcbcdaaf by Cheng Shao at 2024-11-21T14:09:28-05:00 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. - - - - - 970ada5a by Ben Gamari at 2024-11-22T23:32:06-05:00 gitlab-ci: Bump ci-images For introduction of Alpine/i386 image. Thanks to Julian for the base image. Co-Authored-By: Julian Ospald <hasufell(a)hasufell.de> - - - - - 8115abc2 by Ben Gamari at 2024-11-22T23:32:06-05:00 gitlab-ci: Add release job for i386/Alpine As requested by Mikolaj and started by Julian. Co-Authored-By: Julian Ospald <hasufell(a)hasufell.de> - - - - - 639f0149 by Ben Gamari at 2024-11-22T23:32:06-05:00 rts/linker/Elf: Resolve _GLOBAL_OFFSET_TABLE_ - - - - - 490d4d0a by Ben Gamari at 2024-11-22T23:32:06-05:00 gitlab-ci: Mark i386 Alpine test breakages Marks the following tests as broken on i386/Alpine: * T22033 due to #25497 * simd009, T25062_V16, T25169, T22187_run due to #25498 - - - - - 536cdf09 by Cheng Shao at 2024-11-22T23:32:42-05:00 compiler: remove unused GHC.Linker.Loader.loadExpr This patch removes the unused `GHC.Linker.Loader.loadExpr` function. It was moved from `GHC.Runtime.Linker.linkExpr` in `ghc-9.0` to `GHC.Linker.Loader.loadExpr` in `ghc-9.2`, and remain completely unused and untested ever since. There's also no third party user of this function to my best knowledge, so let's remove this. Anyone who wants to write their own GHC API function to load bytecode can consult the source code in older release branches. - - - - - 6ee35024 by Drew Fenwick at 2024-11-22T23:33:26-05:00 Fix a non-compiling example in the type abstractions docs This patch adds a missing Show constraint to a code example in the User Guide's type abstractions docs to fix issue #25422. - - - - - d1172e20 by Rodrigo Mesquita at 2024-11-22T23:34:02-05:00 Re-introduce ErrorCallWithLocation with a deprecation pragma With the removal of the duplicate backtrace, part of CLC proposal #285, the constructor `ErrorCallWithLocation` was removed from base. This commit re-introduces it with a deprecation. - - - - - 1187a60a by Ben Gamari at 2024-11-22T23:34:39-05:00 testsuite: Skip tests requiring Hadrian deps in out-of-tree testsuite runs Some testsuite tests require specific tools (e.g. `check-ppr` and `check-exact`) beyond those shipped in the binary distribution. Skip these tests. Fixes #13897. - - - - - c37d7a2e by Ben Gamari at 2024-11-22T23:34:39-05:00 testsuite: Declare exactprint tests' dependency on check-exact - - - - - 454ce957 by Ben Gamari at 2024-11-22T23:35:15-05:00 ghc-internal: Fix a few cases of missing Haddock markup - - - - - a249649b by Ben Gamari at 2024-11-22T23:35:51-05:00 testsuite/GHCiPrimCall : Add missing Makefile includes - - - - - a021a493 by Ben Gamari at 2024-11-22T23:35:51-05:00 testsuite/IpeStats: Use Make rather than shell interpolation - - - - - 6e1fbda7 by Ben Gamari at 2024-11-25T03:55:44-05:00 hadrian-ghci-multi: Pass -this-package-name in unit response files As noted in #25509, the `-this-package-name` must be passed for each package to ensure that GHC can response references to the packages' exposed modules via package-qualified imports. Fix this. Closes #25509. - - - - - a05e4a9b by Simon Hengel at 2024-11-25T03:56:33-05:00 Refactoring: Use `OnOff` more consistently for `Extension` - - - - - 7536181d by Matthew Pickering at 2024-11-25T14:00:07-05:00 driver: Always link against "base" package when one shot linking The default value for base-unit-id is stored in the settings file. At install time, this can be set by using the BASE_UNIT_ID environment variable. At runtime, the value can be set by `-base-unit-id` flag. For whether all this is a good idea, see #25382 Fixes #25382 - - - - - 7f90f319 by Andreas Klebinger at 2024-11-25T14:00:44-05:00 Compacting GC: Handle black holes in large objects. As #14497 showed black holes can appear inside large objects when we capture a computation and later blackhole it like we do for AP_STACK closures. Fixes #24791 - - - - - 291388e1 by Cheng Shao at 2024-11-25T14:01:19-05:00 ci: minor nix-in-docker improvements This patch makes some minor improvements re nix-in-docker logic in the ci configuration: - Update `nixos/nix` to the latest version - Apply $CPUS to `cores`/`max-jobs` to avoid oversubscribing while allowing a reasonable degree of parallelism - Remove redundant `--extra-experimental-features nix-command` in later `nix shell` invocations, it's already configured in `/etc/nix/nix.conf` - - - - - e684c406 by Cheng Shao at 2024-11-25T14:01:57-05:00 ci: avoid depending on stack job for test-bootstrap jobs This patch makes test-bootstrap related ci jobs only depend on hadrian-ghc-in-ghci job to finish, consistent with other jobs in the full-build stage generated by gen_ci.hs. This allows the jobs to be spawned earlier and improve overall pipeline parallelism. - - - - - caaf5388 by Simon Hengel at 2024-11-25T14:02:41-05:00 Refactoring: Remove `pSupportedExts` from `ParserOpts` This is never used for lexing / parsing. It is only used by `GHC.Parser.Header.getOptions`. - - - - - 41f8365c by Arnaud Spiwack at 2024-11-25T14:03:23-05:00 Add test for #25515 - - - - - 9279619f by Arnaud Spiwack at 2024-11-25T14:03:23-05:00 Desugar record notation with correct multiplicities Simply uses the multiplicity as stored in the field. As I'm writing this commit, the only possible multiplicity is 1, but !13525 is changing this. It's actually easier to take !13525 into account. Fixes #25515. - - - - - fcc3ae6e by Andreas Klebinger at 2024-11-26T08:24:58-05:00 Clarify INLINE unfolding optimization docs. Fixes #24660 - - - - - 88c4fe1d by Cheng Shao at 2024-11-26T08:25:34-05:00 rts: remove -Wl,-U,___darwin_check_fd_set_overflow hack This patch bumps macOS minimum SDK version to 11.0 for x86_64-darwin to align it with aarch64-darwin. This allows us to get rid of the horrible -Wl,-U,___darwin_check_fd_set_overflow hack, which is causing linker warnings and testsuite failures on macOS 15. Fixes #25504. - - - - - 53f978c0 by doyougnu at 2024-11-26T16:07:26-05:00 ghc-experimental: expose GHC.RTS.Flags, GHC.Stats See this CLC proposal: - https://github.com/haskell/core-libraries-committee/issues/289 and this CLC proposal for background: - https://github.com/haskell/core-libraries-committee/issues/288 Metric Decrease: MultiLayerModulesTH_OneShot - - - - - e70d4140 by Wang Xin at 2024-11-26T16:08:10-05:00 Add -mcmodel=medium moduleflag to generated LLVM IR on LoongArch platform With the Medium code model, the jump range of the generated jump instruction is larger than that of the Small code model. It's a temporary fix of the problem descriped in https://gitlab.haskell .org/ghc/ghc/-/issues/25495. This commit requires that the LLVM used contains the code of commit 9dd1d451d9719aa91b3bdd59c0c6679 83e1baf05, i.e., version 8.0 and later. Actually we should not rely on LLVM, so the only way to solve this problem is to implement the LoongArch backend. Add new type for codemodel - - - - - df42ba16 by Andreas Klebinger at 2024-11-27T11:40:49-05:00 Cmm constant folding: Narrow results to operations bitwidth. When constant folding ensure the result is still within bounds for the given type by explicitly narrowing the results. Not doing so results in a lot of spurious assembler warnings especially when testing primops. - - - - - bf3db97e by Ben Gamari at 2024-11-27T11:41:26-05:00 ghc-toolchain: Introduce basic flag validation We verify that required flags (currently `--output` and `--triple`) are provided. The implementation is truly awful, but so is getopt. Begins to address #25500. - - - - - a104508d by Ben Gamari at 2024-11-27T11:42:03-05:00 rts: Allow ExecPage to allocate anywhere in address space Currently the ExecPage facility has two users: * GHCi, for constructing info tables, and * the adjustor allocation path Despite neither of these have any spatial locality constraints ExecPage was using the linker's `mmapAnonForLinker`, which tries hard to ensure that mappings end up nearby the executable image. This makes adjustor allocation needlessly subject to fragmentation concerns. We now instead return less constrained mappings, improving the robustness of the mechanism. Addresses #25503. - - - - - c3fc9b86 by Ben Gamari at 2024-11-27T11:42:39-05:00 base: Fix incorrect mentions of GHC.Internal.Numeric These were incorrectly changed by the automated refactoring of the `ghc-internal` migration. Fixes #25521. - - - - - a362b943 by sheaf at 2024-11-27T23:44:28-05:00 Add checkExact to toolTargets This change means that the Hadrian multi target will include exactprint. In particular, this means that HLS will work on exactprint inside the GHC tree. - - - - - e6c957e4 by Arnaud Spiwack at 2024-11-27T23:45:09-05:00 Add test for #25428 - - - - - 52d97f4e by Arnaud Spiwack at 2024-11-27T23:45:09-05:00 Don't bypass MonoLocalBind in empty patterns Fixes #25428 - - - - - 7890f2d8 by Ben Gamari at 2024-11-28T10:26:46-05:00 hadrian: Bump directory bound to >=1.3.9 Earlier versions of `directory` are racy on Windows due to #24382. Also includes necessary Hadrian bootstrap plan bump. Fixes #24382. - - - - - 0fd43ea6 by Adam Sandberg Ericsson at 2024-11-28T10:27:22-05:00 mention -Iw in +RTS -? - - - - - 6cf579b9 by Ben Gamari at 2024-11-28T10:27:59-05:00 gitlab-ci: Set GIT_SUBMODULE_FORCE_HTTPS GitLab recommends using `https://` to clone submodules and provides the `GIT_SUBMODULE_FORCE_HTTPS` variable to force this. Fixes #25528. - - - - - 5b4774f9 by sheaf at 2024-12-03T15:22:07+01:00 Remove TcRnDeprecatedInvisTyArgInConPat mechanism The combination of ScopedTypeVariables + TypeApplications now no longer enables the use of type applications in constructor patterns, as per GHC proposal #448. This completes the deprecation that begun with GHC 9.8. We also remove the -Wdeprecated-type-abstractions flag, which was introduced in GHC 9.10. - - - - - f813c8d7 by sheaf at 2024-12-03T17:10:15-05:00 Hadrian: use / when making filepaths absolute In Hadrian, we are careful to use -/- rather than </>, in order to use / instead of \ in filepaths. However, this gets ruined by the use of makeAbsolute from System.Directory, which, on Windows, changes back forward slashes to backslashes. - - - - - 292ed74e by Ben Gamari at 2024-12-03T17:10:52-05:00 rts/linker: Fix out-of-bounds mapping logic Previously the structure of `mmapInRegion` concealed a subtle bug concerning handling of `mmap` returning mappings below the beginning of the desired region. Specifically, we would reset `p = result + bytes` and then again reset `p = region->start` before looping around for another iteration. This resulted in an infinite loop on FreeBSD. Fixes #25492. - - - - - 20912f5b by Ben Gamari at 2024-12-03T17:10:52-05:00 rts/linker: Clarify debug output - - - - - f98b3ac0 by Simon Hengel at 2024-12-03T17:11:30-05:00 SysTools: Avoid race conditions when processing output (fixes #16450) - - - - - 03851b64 by Rodrigo Mesquita at 2024-12-03T17:12:06-05:00 mg: Drop unnecessary HasCallStack This HasCallStack was a debugging artifact from a previous commit. - - - - - 01d213b5 by Rodrigo Mesquita at 2024-12-03T17:12:06-05:00 Improve haddock of graphReachabilityCyclic - - - - - f7cbffe2 by Rodrigo Mesquita at 2024-12-03T17:12:06-05:00 Refactor ModuleGraph interface The 'ModuleGraph' abstraction represents the relationship and strucutre of the modules being compiled. This structure is meant to be constructed once at the start of compilation, and never changed again. However, it's exposed interface was confusing and exposed too many footguns which led to inneficient usages of the ModuleGraph. This commit improves significantly the exported interface of ModuleGraph, taking into consideration the recent improvements around reachability queries. Since the ModuleGraph graphs and related structures (HPT, EPS) are performance critical in the sense that somewhat simple mistakes can cause bad leaks and non-linear memory usage, we want to have proper APIs that guide efficient usage. This is a good step in that direction. - - - - - b69a7f3c by David Binder at 2024-12-04T18:37:42-05:00 Use consistent capitalization for "GHC Proposal" in user guide - - - - - 18d9500d by David Binder at 2024-12-04T18:37:42-05:00 Fix reference to GHC proposal 193 in user guide - - - - - dd959406 by Ben Gamari at 2024-12-04T18:38:18-05:00 Revert "rts/Interpreter: Assert that TEST*_P discriminators are valid" This assertion was based on the misconception that `GET_TAG` was returning the pointer tag whereas it is actually returning the constructor tag. This reverts commit 9bf3663b9970851e7b5701d68147450272823197. Fixes #25527. - - - - - cad6fede by Ben Gamari at 2024-12-04T18:38:54-05:00 rts/IOManager: Drop dead code This assignment is dead code as it occurs after all branches have returned. Moreover, it can't possibly be relevant since the "available" branch already sets `flag`. Potentially fixes #25542. - - - - - 55d8304e by Ben Gamari at 2024-12-06T16:56:00-05:00 ghc-internal: Drop GHC.Internal.Data.Enum This module consists only of reexports and consequently there is no reason for it to exist. - - - - - 56b9f484 by Ben Gamari at 2024-12-06T16:56:00-05:00 base: Introduce Data.Bounded As proposed in [CLC#208] but unfortunately `Data.Enum` was already incorrectly introduced in the `ghc-internal` refactor. [CLC#208]: https://github.com/haskell/core-libraries-committee/issues/208 - - - - - 336d392e by Ben Gamari at 2024-12-06T16:56:00-05:00 base: Deprecate export of Bounded from Data.Enum This begins the process of bringing us into compliance with [CLC#208]. [CLC#208]: https://github.com/haskell/core-libraries-committee/issues/208 - - - - - dd7ca939 by Ben Gamari at 2024-12-06T16:56:00-05:00 base: Mention incorrect Data.Enum addition in changelog - - - - - dfd1db48 by Ben Gamari at 2024-12-06T16:56:36-05:00 base: Reintroduce {Show,Enum} IoSubSystem These instances were dropped in !9676 but not approved by the CLC. Addresses #25549. - - - - - 090fc7c1 by Peter Trommler at 2024-12-07T03:41:21-05:00 Fix requirements on T25240 T25240 doesn't need RTS linker, GHCi is sufficient and GHCi can also be dynamically linked. - - - - - 3fb5d399 by Peter Trommler at 2024-12-07T03:41:21-05:00 Fix requirements for T25155 Loading C objects requires RTS linker. - - - - - 4c58bdf6 by Leary at 2024-12-07T03:42:07-05:00 TH: Add typed variants of dataToExpQ and liftData This commit introduces to template-haskell (via ghc-internal) two functions `dataToCodeQ` and `liftDataTyped`, typed variants of `dataToExpQ` and `liftData` respectively. Tested in: `dataToCodeQUnit`. - - - - - 63027593 by Serge S. Gulin at 2024-12-08T13:52:05+03:00 JS: Basic cleanup for unused stuff to simplify things. 1. Make `staticInitStat`, `staticDeclStat`, `allocUnboxedConStatic`, `allocateStaticList`, `jsStaticArg` local to modules. 2. Remove unused `hdRawStr`, `hdStrStr` from Haskell and JavaScript (`h$pstr`, `h$rstr`, `h$str`). 3. Introduce a special type `StaticAppKind` enumeration and `StaticApp` to represent boxed scalar static applications. Originally, StaticThunk supported to pass Maybe when it became Nothing for initializied thunks in an alternatie way but it is not used anymore. - - - - - a9f8f1fb by Serge S. Gulin at 2024-12-08T14:10:45+03:00 JS: Add trivial optimizations for `unpackCString` and `unpackCStringUtf8`. It became possible due of introduction strings unfloating at Sinker pass (#13185). Earns few more bytes at optimizations. - - - - - b519c06b by Serge S. Gulin at 2024-12-08T15:50:26+03:00 JS: Specialize unpackCString# CAFs (fixes #24744) Code analysis shown that such optimization would be possible out of the box if `cachedIdentForId` allowed to do that for Haskell `Id`s which are represented by few JavaScript `Ident`s. It is a usual for strings which are represented at JavaScript as a pair of 2 values: the string content and the offset where to start reading actual string from the full content. Usually offset is 0 but technically we need to allow such complex structures to be treated as "global". Enabling it there shown that `genToplevelRhs` and `globalOccs` had inaccuracies in their implementations: 1. `globalOccs` operated over JavaScript's `Ident`s but for complex structures it didn't pay attention to the fact that different Idents actually could be pointed to same Id. Now the algo is changed to calculate occurencies for Ids. 2. `genToplevelRhs` didn't assume that different Idents pointed to same Id can have mixed order of occurence. But actually the order is important. Strings are encoded into 2 variables where first is content and second is offset and their order are not interchangeable. It is fixed by regeneration Idents from collected Ids which is fine because all Idents generation is passed through the Cache and they are quasi-stable. - - - - - a8ceccf3 by Brandon Chinn at 2024-12-09T16:25:43-05:00 Fix panic in multiline string with unterminated gap (#25530) - - - - - 9e464ad0 by Brandon Chinn at 2024-12-09T16:25:43-05:00 Add test case for unterminated multiline string - - - - - ed1ed5c6 by Rodrigo Mesquita at 2024-12-09T16:26:19-05:00 Revert mapMG renaming We had previously renamed this function for consistency, but that caused unnecessary breakage - - - - - 158261f7 by Sylvain Henry at 2024-12-09T16:27:01-05:00 RTS: make Cabal flags manual Cabal shouldn't automatically try to set them. We set them explicitly. - - - - - a83b7ed6 by Matthew Stephenson at 2024-12-10T14:01:22-05:00 Add missing @since documentation for (!?) function - - - - - e745e3a3 by Ben Gamari at 2024-12-10T14:01:59-05:00 compiler: Don't attempt to TSAN-instrument SIMD operations TSAN only provides instrumentation for 8, 16, 32, and 64-bit memory loads/stores. Don't attempt to instrument wider operations. Fixes #25563. - - - - - 684c0018 by Ben Gamari at 2024-12-10T14:02:35-05:00 gitlab/ci: Don't clobber RUNTEST_ARGS Previously the logic handling `IGNORE_PERF_FAILURES` clobbered the user's `RUNTEST_ARGS`. Fix this. - - - - - 41dae5b8 by Ben Gamari at 2024-12-10T14:03:11-05:00 hadrian: Mitigate mktexfmt race At least some versions of Texlive's `mktexfmt` utility cannot be invoked concurrently in their initial run since they fail to handle failure of `mkdir` due to racing. Specifically, we see ``` | Run Xelatex: users_guide.tex => /tmp/extra-dir-9616886274866 | Run Xelatex: Haddock.tex => /tmp/extra-dir-9616886274869 This is XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020) (preloaded format=xelatex) restricted \write18 enabled. kpathsea: Running mktexfmt xelatex.fmt mktexfmt: mktexfmt is using the following fmtutil.cnf files (in precedence order): mktexfmt: /usr/share/texlive/texmf-dist/web2c/fmtutil.cnf mktexfmt: mktexfmt is using the following fmtutil.cnf file for writing changes: mktexfmt: /builds/ghc/ghc/tmp-home/.texlive2020/texmf-config/web2c/fmtutil.cnf /usr/bin/mktexfmt: mkdir(/builds/ghc/ghc/tmp-home/.texlive2020/texmf-var/web2c/) failed for tree /builds/ghc/ghc/tmp-home/.texlive2020/texmf-var/web2c: File exists at /usr/share/texlive/tlpkg/TeXLive/TLUtils.pm line 937. I can't find the format file `xelatex.fmt'! ``` That is two `mktexfmt` invocations (for the user's guide and haddock builds) attempted to create `$HOME/texlive2020/texmf-var/web2c` and raced. One of the two `mkdir`'s consequently failed, bringing down the entire build. We avoid this by ensuring that the first `xelatex` invocation is always performed serially. Fixes #25564. - - - - - 9efbc51f by Ben Gamari at 2024-12-10T14:03:48-05:00 rts/CheckUnload: Reset old_objects if unload is skipped Previously `checkUnload` failed to reset `old_objects` when it decided not to unload (e.g. due to heap profiling being enabled). Fixes #24935. - - - - - 5192a75f by Ben Gamari at 2024-12-11T04:28:11-05:00 rts: Annotate BCOs with their Name This introduces a new bytecode instruction, `BCO_NAME`, to aid in debugging bytecode execution. This instruction is injected by `mkProtoBCO` and captures the Haskell name of the BCO. It is then printed by the disassembler, allowing ready correlation with STG dumps. - - - - - 99225996 by Ben Gamari at 2024-12-11T04:28:48-05:00 configure: Implement ld override whitelist Bring `configure` into alignment with `ghc-toolchain`, ensuring that the ld-override logic will only take effect on Linux and Windows. Fixes #25501. - - - - - 4a8fc928 by Ben Gamari at 2024-12-11T12:33:42+00:00 testsuite: Unmark T14028 as broken on FreeBSD This now appears to pass on FreeBSD 14. Closes #19723. - - - - - d7c0eb5a by Ben Gamari at 2024-12-11T12:33:42+00:00 gitlab-ci: Migrate FreeBSD runner tag to FreeBSD 14 - - - - - 7246dacc by Ben Gamari at 2024-12-11T12:33:42+00:00 gitlab-ci: Reintroduce FreeBSD 14 job - - - - - 4af936da by Ben Gamari at 2024-12-11T12:33:42+00:00 gitlab-ci: Allow use of newer cabal-install bindists Newer cabal-install bindists have internal directory structure. Here we detect and account for the presence of such structure. - - - - - cbf38c1b by Ben Gamari at 2024-12-11T12:33:42+00:00 gitlab-ci: Enable documentation build on FreeBSD 14 - - - - - d68107fb by Ben Gamari at 2024-12-11T12:33:42+00:00 gitlab-ci: Use system libffi on FreeBSD - - - - - fea3b590 by Ben Gamari at 2024-12-11T12:33:42+00:00 testsuite: Mark linker_unload as broken on FreeeBSD Due to #25491. - - - - - ccf171ee by Ben Gamari at 2024-12-11T12:33:42+00:00 gitlab-ci: Prefer system toolchain on FreeBSD It's not uncommon to find machines with gcc installed via ports. We should be using the system's default clang-based toolchain instead. - - - - - cfb34738 by Ben Gamari at 2024-12-11T12:33:42+00:00 testsuite: Mark T21969 as broken on FreeBSD Due to #25512. - - - - - 0b64e37c by Ben Gamari at 2024-12-11T12:33:42+00:00 testsuite: Mark RestartEventLogging as broken on FreeBSD I am seeing this fail quite reproducibly. Due to #19724. - - - - - 3b412019 by Ben Gamari at 2024-12-11T12:33:42+00:00 testsuite: Mark T16180 as "broken" on FreeBSD Sadly we in fact need to skip it as it merely times out during compilation. See #14012. - - - - - 57e3cab5 by Ben Gamari at 2024-12-11T12:33:42+00:00 testsuite: Skip T16992 unless in slow speed This test has extraordinary memory requirements and tests a rather niche aspect of the compact region mechanism. It has been suggested multiple times that we shouldn't run it in the default testsuite configuration. Finally implement this. See #21890. See #21892. - - - - - f08a72eb by Ben Gamari at 2024-12-11T19:30:54-05:00 rts(setNumCapabilities): Assert that n_caps < MAX_N_CAPS It was noticed in #25560 that this would previously be allowed, resulting in a segfault. I will add a proper exception in `base` in a future commit. - - - - - e10d31ad by Ben Gamari at 2024-12-11T19:30:55-05:00 ghc-internal: Fix inconsistent FFI import types The foreign imports of `enabled_capabilities` and `getNumberOfProcessors` were declared as `CInt` whereas they are defined as `uint32_t`. - - - - - 06265655 by Ben Gamari at 2024-12-11T19:30:55-05:00 rts: Mention maximum capability count in users guide Addresses #25560. - - - - - d488470b by Ben Gamari at 2024-12-11T19:30:55-05:00 rts/Capability: Move induction variable declaration into `for`s Just a stylistic change. - - - - - 71f050b7 by Ben Gamari at 2024-12-11T19:30:55-05:00 rts: Determine max_n_capabilities at RTS startup Previously the maximum number of capabilities supported by the RTS was statically capped at 256. However, this bound is uncomfortably low given the size of today's machine. While supporting unbounded, fully-dynamic adjustment would be nice, it is complex and so instead we do something simpler: Probe the logical core count at RTS startup and use this as the static bound for the rest of our execution. This should avoid users running into the capability limit on large machines while avoiding wasting memory on a large capabilities array for most users and keeping complexity at bay. Addresses #25560. - - - - - 1e84b411 by Ben Gamari at 2024-12-11T19:30:55-05:00 testsuite: Introduce req_c_rts As suggested by @hsyl20, this is intended to mark tests that rely on the behavior of the C RTS. - - - - - 683115a4 by Ben Gamari at 2024-12-11T19:30:55-05:00 testsuite: Add test for #25560 - - - - - ef2052a8 by Ben Gamari at 2024-12-12T04:42:32-05:00 testsuite: Only run T14497_compact in normal way This test targets the compacting GC so it makes little sense to run it across all ways. Moreover, it outright conflicts with the `nonmoving` way. - - - - - 34d3e8e6 by Ben Gamari at 2024-12-12T04:43:08-05:00 rts/CheckUnload: Don't prepare to unload if we can't unload Previously `prepareUnloadCheck` would move the `objects` list to `old_objects` even when profiling (where we cannot unload). This caused us to vacate the `objects` list during major GCs, losing track of loaded objects. Fix this by ensuring that `prepareUnloadCheck` and `checkUnload` both use the same short-cutting logic. - - - - - 9c53489d by Andrei Borzenkov at 2024-12-12T15:06:42-05:00 Update GHCi :info type declaration printing (#24459) - Do not print result's kind in type families because we have full kind in SAKS and we display invisible arity using @-binders - Do not suppress significant invisible binders An invisible binder is considered significant when it meets at least one of the following two criteria: - It visibly occurs in the declaration's body - It is followed by a significant binder, so it affects positioning For non-generative type declarations (type synonyms and type families) there is one additional criterion: - It is not followed by a visible binder, so it affects the arity of a type synonym See Note [Print invisible binders in interface declarations] for more information about what is "visibly occurs" - - - - - 13fe48d4 by Matthew Pickering at 2024-12-12T15:07:19-05:00 typechecker: Perform type family consistency checks in topological order Consider a module M importing modules A, B and C. We can waste a lot of work depending on the order that the modules are checked for family consistency. Consider that C imports A and B. When compiling C we must have already checked A and B for consistency, therefore if C is processed first then A and B will not need to be checked for consistency again. If A and B are compared first, then the consistency checks will be performed against (wasted as we already performed them for C). At the moment the order which modules are checked is non-deterministic. Clearly we should engineer that C is checked before B and A, but by what scheme? A simple one is to observe that if a module M is in the transitive closure of X then the size of the consistent family set of M is less than or equal to size of the consistent family set of X. Therefore by sorting the imports by the size of the consistent family set and processing the largest first, you make sure to process modules in topological order. In practice we have observed that this strategy has reduced the amount of consistency checks performed. One solution to #25554 - - - - - 62a2b25f by Sylvain Henry at 2024-12-14T04:31:09-05:00 TNTC: set CmmProc entry_label properly (#25565) Before this patch we were renaming the entry label of a CmmProc late in the CmmToAsm pass. It led to inconsistencies and to some labels being used in info tables but not being emitted (#25565). Now we set the CmmProc entry label earlier in the StgToCmm monad and we don't renamed it afterwards. - - - - - b339e7c3 by Simon Hengel at 2024-12-14T04:31:47-05:00 Make filter functionality for system tools line-based This is more efficient as: - All existing filter functions were line-based anyway. They broke up the input into lines and then joined it back together. - We already break up the output from system tools into lines when processing it. Splitting up the output of system tools once and then filtering and processing it reduces both code and runtime complexity. - - - - - 39669077 by Simon Hengel at 2024-12-14T04:31:47-05:00 Refactoring: Don't use a `Chan` when parsing SysTools output - - - - - 64756530 by Simon Peyton Jones at 2024-12-14T22:28:04-05:00 Tidy up the handling of `assert` Fixes #25493 - - - - - 8658fbc1 by Rodrigo Mesquita at 2024-12-14T22:28:41-05:00 base: displayException for SomeAsyncException Provide a better implementation of `SomeException` for `SomeAsyncException`. The previous, implicit, implementation, would not use the `displayException` of the exception wrapped by `SomeAsyncException`. Implements CLC-Proposal#309 Closes #25513 - - - - - 2d3a0a70 by ARATA Mizuki at 2024-12-15T18:35:30-05:00 LLVM: When emitting a vector literal with ppTypeLit, include the type information Fixes #25561 - - - - - bfacc086 by Simon Peyton Jones at 2024-12-15T18:36:05-05:00 Fix signature lookup in instance declarations This fixes a bug introduced by the fix to #16610 - - - - - 80f0e02d by Simon Peyton Jones at 2024-12-16T17:13:52+00:00 Improve GHC build times Two small changes * In GHC.Data.Unboxed, never omit interface pragmas. In "fast builds" one might omit them generally, but doing so gives very bad performance for code that imports this module. * In GHC.Hs.Dump don't do type-class specialisation. For some reason it goes mad and generates vast amounts of useless code. See #25463. - - - - - 175a1355 by Simon Peyton Jones at 2024-12-16T17:13:52+00:00 Refactor Lint Refactor Lint for two reasons: * To improve performance * To prepare for type-lets The big changes are all in GHC.Core.Lint: * Change the main APIs: * `lintType` returns nothing rather than returning a `LintedType`; * `lintCoercion` return nothing rather than returning a `LintedCoercion` Reason: these functions did a lot of allocation to return a substituted type/coercion that was often discarded, or used only to extract its kind. Instead we now return nothing, and, when needed, extract the kind and substitute. * Applications are treated as a whole, by `lintApp`. By treating multiple arguments all at once we avoid performing multiple substitutions, each substituting a single type variable. This can make an absolutely huge difference. Overall this led to a pretty massive rewrite of Lint, with many smaller changes. Smaller chnages elsewhere * Rename `GHC.Core.TyCo.Subst.getSubstInScope` to `substInScopeSet` for consistency * Define and use `GHC.Core.Type.liftedTypeOrConstraintKind` Performance. This MR someimtes gives gives a very large improvement in compile time, when Lint is on. here is a selection of changes over 5% in perf/compiler (with -dcore-lint) T25196 -97.0% T14766 -89.7% T14683 -74.4% T5631 -60.9% T20261 -56.7% T18923 -17.6% T13035 -15.8% T6048 -15.8% CoOpt_Read -14.4% T9630 -10.9% T5642 -7.3% Eliminating the egregious offenders is a big win. However, in some cases the compiler allocation /increases/. Here ae the changes over 1%: T9961 1.5% T8095 2.8% T14052 3.9% T12545 4.5% T14052Type 5.5% T5030 8.0% T5321Fun 8.3% T3064 12.7% CoOpt_Singletons 15.6% T9198 16.0% LargeRecord 18.1% I looked at the two biggest increases in compile-time bytes allocated. Interestingly, they both show substantial *decreases* in actual compile time, due to much smaller GC times. I'm honestly not sure either why the allocation increases, or why the GC time decreases; but I'm going to take the win! T9198 Baseline With patch No Lint Alloc 44.6M 44.6M Mut time 0.23s 0.22s GC time 0.21s 0.21s With Lint Alloc 309M 360M Mut time 1.51s 0.85s GC time 2.97s 0.25s ------------------- LargeRecord Baseline With patch No Lint Alloc 1.37G 1.37G Mut time 2.33s 2.33s GC time 2.40s 2.42s With Lint Alloc 3.4G 4.0G Mut time 6.02s 5.68s GC time 3.67s 3.03s IMPORTANT NOTE: These changes don't show up in CI because in CI the tests in perf/compiler are all run with -dcore-lint switched off. I gathered this data with some manual runs. - - - - - 8ef2dad6 by Simon Peyton Jones at 2024-12-17T02:48:09-05:00 Add Note [Typechecking overloaded literals] See #25494. - - - - - e86b1b20 by Ben Gamari at 2024-12-17T13:51:39-05:00 testsuite: Use math.inf instead of division-by-zero This both more directly captures the intent and also fixes #25580. - - - - - 430d965a by Ben Gamari at 2024-12-17T13:52:15-05:00 rts: Fix incorrect format specifiers in era profiling Fixes #25581. - - - - - 267098ad by Andreas Klebinger at 2024-12-18T23:43:13-05:00 Document `-prof` and non `-prof` code being incompatible. Fixes #25518. - - - - - 04433916 by Zubin Duggal at 2024-12-18T23:43:50-05:00 ghcup metadata: output metadata fragment in CI (cherry picked from commit 52b58a660e735b20961d792d8fa9267f01247a50) - - - - - 7c78804e by Zubin Duggal at 2024-12-18T23:43:50-05:00 ghcup metatdata: use fedora33 for redhat Redhat 9 doesn't have libtinfo.so.5 anymore (cherry picked from commit dc86785eb43afd1bd292287c064fb5ad94fe8c7f) - - - - - 1d72cfb2 by Zubin Duggal at 2024-12-18T23:43:50-05:00 ghcup metadata: still use centos for redhat <9 - - - - - 3f7ebc58 by Sylvain Henry at 2024-12-19T20:40:14-05:00 Merge ghc-bignum into ghc-internal (#24453) First step towards merging ghc-bignum and ghc-prim into ghc-internal. After this patch, ghc-bignum is deprecated and is just a shallow package reexporting modules from ghc-internal and base. Use those directly instead. Move `gmp` submodule into ghc-internal directory. - - - - - ee0150c2 by Rodrigo Mesquita at 2024-12-19T20:40:51-05:00 Improve performance of deriving Show Significantly improves performance of deriving Show instances by avoiding using the very polymorphic `.` operator in favour of inlining its definition. We were generating tons of applications of it, each which had 3 type arguments! Improves on #9557 ------------------------- Metric Decrease: InstanceMatching T12707 T3294 ------------------------ - - - - - 8b266671 by Rodrigo Mesquita at 2024-12-19T20:40:51-05:00 Don't eta expand cons when deriving Data This eta expansion was introduced with the initial commit for Linear types. I believe this isn't needed any longer. My guess is it is an artifact from the initial linear types implementation: data constructors are linear, but they shouldn't need to be eta expanded to be used as higher order functions. I suppose in the early days this wasn't true. For instance, this works now: data T x = T x f = \(x :: forall y. y -> T y) -> x True f T -- ok! T is linear, but can be passed where an unrestricted higher order function is expected. I recall there being some magic around to make this work for data constructors... Since this works, there's no need to eta_expand the data constructors in the derived Data instances. - - - - - 1f67ad21 by Andrei Borzenkov at 2024-12-25T01:42:31-05:00 Flip the order of arguments of setField (#24668) GHC Proposal 583 "HasField redesign" specifies the following order of a setField function arguments as this: setField :: forall fld a b. SetField fld a b. b -> a -> a This patch flips the application order to match the spec. - - - - - 3e0c948d by Ben Gamari at 2024-12-25T01:43:08-05:00 rel-eng/upload: Add set_symlink mode This slightly eases updating of the `latest` symlinks. - - - - - 63d63f9d by Simon Peyton Jones at 2024-12-25T01:43:45-05:00 Preserve orientation when unifying kinds This MR fixes yet another manifestation of the trickiness caused by Note [Fundeps with instances, and equality orientation]. I wish there was a more robust way to do this, but this fix is a definite improvement. Fixes #25597 - - - - - 94ba9a6a by ARATA Mizuki at 2024-12-26T10:47:57-05:00 x86 NCG SIMD: Support pack/insert/broadcast/unpack of 128-bit integer vectors - - - - - 6bf0d587 by Andrew Lelechenko at 2024-12-26T10:48:33-05:00 docs: fix haddock formatting in Control.Monad.Fix - - - - - feb14af1 by Sergey Vinokurov at 2024-12-27T15:06:28+00:00 Remove unnecessary irrefutable patterns from NonEmpty functions Implementation of https://github.com/haskell/core-libraries-committee/issues/107 - - - - - 6a0d91b4 by Sergey Vinokurov at 2024-12-27T15:06:28+00:00 Make cons, Semigroup, IsList, and Monad instances stricter - - - - - 1249e597 by Sergey Vinokurov at 2024-12-27T15:06:28+00:00 Restore some laziness in <| and Semigroup instance, improve Monad instance The Monad instance shouldn't produce the outer :| unless f a reduces to WHNF. (Notice that the b :| bs match is implicitly lazy.) - - - - - 8699d826 by Sergey Vinokurov at 2024-12-27T15:12:30+00:00 Add comment outlining Data.List.NonEmpty implementation guiding principles - - - - - 7febe00e by Sergey Vinokurov at 2024-12-27T22:24:43+00:00 Fix tests since location of ‘>>=’ changed - - - - - a928c326 by ARATA Mizuki at 2024-12-28T03:06:14-05:00 Fix LLVM version detection With a recent LLVM, `llc -version` emits the version on the first line if the vendor is set. It emits the version on the second line otherwise. Therefore, we need to check the both lines to detect the version. GHC now emits a warning if it fails to detect the LLVM version, so we can notice if the output of `llc -version` changes in the future. Also, the warning for using LLVM < 10 on s390x is removed, because we assume LLVM >= 13 now. This fixes the definition of __GLASGOW_HASKELL_LLVM__ macro. Fixes #25606 - - - - - 7f79257a by Zubin Duggal at 2024-12-29T13:04:35+00:00 Bump base, ghc-prim and template-haskell versions for 9.12 Also bump various submodules. (cherry picked from commit 6fc1fa3bdc8f53acdb19e47145789274060e498f) Bump base bound to 4.21 for GHC 9.12 (cherry picked from commit 473a201c6b55aea5bf9c9db0836a66ea1b657e04) Bump binary submodule to 0.8.9.2 (cherry picked from commit 7199869a52ab45e8856658248bf807954d58cc20) (cherry picked from commit ec2f40b45c1a3d82d17a2fc07e9ddb9218bc3940) Bump exceptions submodule to 0.10.9 (cherry picked from commit f5b5d1dc2d326368e5b173d622630d77f019b629) Bump file-io submodule to 0.1.4 (cherry picked from commit ba786681de6ac5fa49938e2cd71a5988f0f40d1f) bump os-string submodule to 2.0.6 (cherry picked from commit 3a7ffdbb832c045a55fd1ef24f546abdd9d9e30f) bump transformers submodule to 0.6.1.2 (cherry picked from commit 53b46fd437421b9e5a001edc6d1c427439d7714f) Bump directory submodule to v1.3.9.0 (cherry picked from commit 27dc2664c5404bb462092bb216c2c37b418fd1f8) Bump Win32 submodule to v2.14.1.0 (cherry picked from commit 80df88086180f5e39212b2feacf70a9d2b263c6c) Bump filepath submodule to 1.5.3.0 (cherry picked from commit 29bfae2c58a7303a081a6e7956b9f55e5faf3eeb) Bump file-io submodule to avoid usage of QuasiQuotes (cherry picked from commit 97b0dff223a6c4cc003adec448104c277f214645) Bump unix submodule to 2.8.6.0 (cherry picked from commit a1f56d6d6a99c100f88ef0a8b4d51298cf24a42d) Bump os-string submodule to 2.0.8 (cherry picked from commit 0121b76fd52ea0c0ce5d07085bc195666b63c625) Bump file-io submodule to avoid usage of QuasiQuotes (cherry picked from commit 962ceb50c8a6fc370e1c0a267f5cd5562a8cf759) Bump filepath submodule to 1.5.4.0 (cherry picked from commit 7bc6877fd5d41c6d5900678ad5e73ed30f366569) Bump file-io submodule to 0.1.5 (cherry picked from commit 9478b5aefe2877d58baf527edcf936dddbb955b7) Bump Cabal submodule to 3.14.1.0 (cherry picked from commit 5c9c3e3f79a79bb6d9a77a17c716dc3a0bcbd2aa) Bump directory submodule to 0.12.2.0 (cherry picked from commit 897906265db37af34ae2aaa016cec417f263407b) Bump array submodule for base bump Bump stm submodule for base bump Bump process submodule for base bump - - - - - f6079408 by Zubin Duggal at 2024-12-29T13:04:35+00:00 Fix ghc-e005 after HasCallstack changes (cherry picked from commit 77f340a24561cea8a6f2ada296b3ea356ab1823c) - - - - - 3e10fa75 by Zubin Duggal at 2024-12-29T13:04:35+00:00 Add haskeline to stage0Packages Otherwise we link against boot inplace and boot unix as boot haskeline depends on boot unix. (cherry picked from commit 90b493769ebdf3cd7be404d18462dc20ac1044df) - - - - - 4ad6aec4 by Zubin Duggal at 2024-12-29T13:04:35+00:00 Fix TH changelog - - - - - ea3f7fd5 by Zubin Duggal at 2024-12-29T13:04:35+00:00 release: copy index.html from correct directory (cherry picked from commit cbfd0829cd61928976c9eb17ba4af18272466063) - - - - - fafb70db by Zubin Duggal at 2024-12-29T13:04:35+00:00 hadrian-multi: warn on unused imports os-string has redundant imports (cherry picked from commit dde3796be689ea57543936e22aa5ea4ef7ed995e) - - - - - c02b1e46 by Simon Peyton Jones at 2024-12-29T17:04:30-05:00 Fix in-scope set for CSE Ticket #25468 showed an assertion failure in CSE because a top-level Id was being used before it was defined. Reason: Note [Glomming] in GHC.Core.Opt.OccurAnal. Solution (used in many places): just put all the top-level bindings in scope at the beginning of CSE. Compile-time allocation wobbles up and down a tiny bit; geo mean is zero. But MultiLayerModulesTH_OneShot and hard_hole_fits increase (on some architectures only) by a bit oever 2% . I think these are just a random fluctuations. Metric Increase: MultiLayerModulesTH_OneShot hard_hole_fits - - - - - 559d4f84 by Krzysztof Gogolewski at 2024-12-30T11:53:19-05:00 Add tests for #23883 The issue has been fixed by commit f5d3e03c56ffc63. Only T23883a is the actual regression test, the remaining ones are tricky cases found during development of an independent fix !11313. - - - - - 278a53ee by Sergey Vinokurov at 2024-12-30T11:53:59-05:00 Update changelog for CLC proposal #107 (NonEmpty laziness) - - - - - f56558be by Matthew Pickering at 2025-01-07T13:53:03-05:00 warnings: Find out if a qualified name is in the interactive scope directly There were two ad-hoc mechanisms used to determine which modules were in the interactive scope. 1. Look at everything in the GRE, to see what is imported qualified. 2. Look at the last loaded module in the HPT. (1) Is very inefficient, GlobalRdrEnvs can be very big. (2) is incorrect, there is no reason to assume the "last" thing added to the HPT has any relevance to module loading order. Happily, the same checks can be implemented directly by looking at the interactive imports from the interactive context. This mirrors what happens for normal imports. Arguably, the error reporting code shouldn't be doing this kind of processing and it should be an option is set when rendering the error message. However, this just improves the situation and doesn't block progress on that front in future. See #14225 and #15611 Fixes #25600 - - - - - 84155cdb by Simon Peyton Jones at 2025-01-07T13:53:40-05:00 Tidy up kcConDecls Addresses #25630 In particular, * Introduce ConArgKind and use it. * Make kcConDecls and tcConDecls work the same way concerning the kind of argument types - - - - - 6c12b6cf by Bryan Richter at 2025-01-07T18:15:02-05:00 Remove tmp files after toolchain check Fixes #25620 - - - - - 42826a89 by Cheng Shao at 2025-01-07T18:15:39-05:00 xxhash: bump to v0.8.3 - - - - - 185f17e4 by sheaf at 2025-01-07T18:16:15-05:00 Fix typo in GHC.Tc.Solver.Solve.runTcPluginsWanted - - - - - 23099752 by Luite Stegeman at 2025-01-08T00:33:33+01:00 Add flags for switching off speculative evaluation. We found that speculative evaluation can increase the amount of allocations in some circumstances. This patch adds new flags for selectively disabling speculative evaluation, allowing us to test the effect of the optimization. The new flags are: -fspec-eval globally enable speculative evaluation -fspec-eval-dictfun enable speculative evaluation for dictionary functions (no effect if speculative evaluation is globally disabled) The new flags are on by default for all optimisation levels. See #25284 - - - - - 0161badc by Ben Gamari at 2025-01-09T17:30:05-05:00 rts/printClosure: Print IPE information for thunks and functions This makes it considerably easier to grok the structure of the heap when IPE information is available. - - - - - 023f36f5 by Rodrigo Mesquita at 2025-01-10T14:57:48-05:00 user_guide: Note -pgmP/-optP are for /Haskell/-CPP Fixes #25574 - - - - - e1c133f2 by Ben Gamari at 2025-01-10T14:58:25-05:00 dump-decls: Suppress unit-ids While the testsuite driver already normalizes these away, they are nevertheless a severe nuisance when diffing outside of the testsuite. Intriguingly, this doesn't completely eliminate the unit IDs; some wired-in names are still printed. However, this is a cheap and helpful improvement over the status quo so I am simply going to accept this. Fixes #25334. - - - - - 2e7bf446 by sheaf at 2025-01-13T10:55:26+01:00 Remove SDocs from ErrCtxt & ErrInfo This commit: - turns the SDoc used in ErrCtxt into a proper error datatype, ErrCtxtMsg, which contains all the different error contexts that can be added, - replaces ErrInfo with [ErrCtxt]. ErrInfo used to contain two SDocs; the first is replaced with [ErrCtxt], and the second is removed, with the relevant information being put in the appropriate error message constructors. Fixes #23436 - - - - - 2d62b970 by Mike Pilgrem at 2025-01-13T12:59:10-05:00 Re CLC #300 - Specify fmap for NonEmpty as map See: * https://github.com/haskell/core-libraries-committee/issues/300 Seeks to: * move existing instances for NonEmpty (except of Eq and Ord) out of GHC.Internal.Base into new GHC.Internal.Data.NonEmpty (to avoid otherwise unavoidable cycles in the module graph); * move map out of Data.List.NonEmpty (base package) into GHC.Internal.Data.NonEmpty; * define fmap as map for NonEmpty instance of Functor, avoiding code duplication; * re-export map from existing GHC.Internal.Data.List.NonEmpty; and * re-export map from Data.List.NonEmpty (base package); without breaking anything in the GHC repository. Various tests *.stdout and *.stderr files are amended also. - - - - - ab3ab3e3 by Luite Stegeman at 2025-01-13T12:59:58-05:00 compiler/coreprep: Turn off dictionary speculation by default Speculative evaluation can cause performance regressions, therefore we turn it off by default. It can be enabled again with the -fspec-eval-dictfun flag See #25284 - - - - - 3d9cacd5 by Patrick at 2025-01-14T02:34:46+08:00 Enhance kind inference for data family instances This commit improves kind inference for data family instances by kind-checking the constructors, for H98 and newtype declarations (ONLY), as well as kind-checking the result kind signature (when using GADT syntax). This fixes #25611. Typechecker changes: In `tcDataFamInstHeader`, we now kind-check the constructors using `kcConDecls`, for H98-style decls and newtype decls ONLY. See Note [Kind inference for data family instances]. Testsuite changes: - The T25611{a,b,c,d} tests test the new kind inference implementation. - a,b: infer result kind from constructors (H98 case) - c: renamed version of test UnliftedNewtypesUnassociatedFamilyFail, which now passes - d: GADT case, checking that we don't infer overly rigid kinds when kind-checking the constructors in data family instances. - DataInstanceKindsDefaults tests defaulting data instance kinds without UnliftedNewtypes or UnliftedDatatypes, as outlined in Note [Defaulting result kind of newtype/data family instance]. Also a few notes are updated to reflect the changes. Co-authored-by: default avatarSimon Peyton Jones <simon.peytonjones(a)gmail.com> - - - - - f6493dbc by amesgen at 2025-01-15T18:47:23-05:00 wasm: prevent bundlers from resolving import("node:timers") This fixes the following esbuild error: ✘ [ERROR] Could not resolve "node:timers" www/ghc_wasm_jsffi.js:66:25: 66 │ return (await import("node:timers")).setImmediate; ╵ ~~~~~~~~~~~~~ The package "node:timers" wasn't found on the file system but is built into node. Are you trying to bundle for node? You can use "--platform=node" to do that, which will remove this error. Previously (i.e. after !13503), one had to work around this by passing `--external:node:timers`. - - - - - 87e82e2e by sheaf at 2025-01-16T14:51:45+01:00 Use checkTyEqRhs to make types concrete This commit refactors makeTypeConcrete to call checkTyEqRhs with the appropriate parameters. This avoids duplicating subtle logic in two places in the compiler. Changes: 1. Refactor of 'TyEqFlags'. Now 'TyEqFlags' stores a 'TEFTask', which is a description of which of the following checks we want to perform in 'checkTyEqRhs': - occurs check - level check - concreteness check In the process, the 'AreUnifying' datatype has been removed, as it is no longer needed. 2. Refactor of 'checkTyVar': a. Make use of the new 'TEFTask' data type to decide which checks to perform. In particular, this ensures that we perform **both** a concreteness check and a level check when both are required; previously we only did a concreteness check (that was a bug!). b. Recursively call 'checkTyVar' on the kind of unfilled metavariables. This deals with a bug in which we failed to uphold the invariant that the kind of a concrete type must itself be concrete. See test cases T23051, T23176. 3. Re-write of 'makeTypeConcrete', which now simply calls 'checkTyEqRhs' with appropriate 'TyEqFlags'/'TEFTask'. This gets rid of code duplication and risk for the two code paths going out-of-sync. Fixes #25616. See also #23883. - - - - - 5a8f35bd by ARATA Mizuki at 2025-01-17T11:17:49-05:00 x86 NCG: Use correct format for MOVD in the implementation of unpackInt64X2# MOVD takes the input format. Fixes #25658 - - - - - 14f8a7ec by Mateusz Goślinowski at 2025-01-17T22:49:09+00:00 Allow multiline strings in JS FFI (#25633) - - - - - 854c2f75 by Simon Peyton Jones at 2025-01-18T02:54:08-05:00 Fix a buglet in tcSplitForAllTyVarsReqTVBindersN The problem was that an equation in `split` had two guards (one about visiblity and one about `n_req`). So it fell thorugh if /either/ was False. But the next equation then assumed an invisible binder. Simple bug, easily fixed. Fixes #25661. - - - - - 264a1186 by sheaf at 2025-01-18T10:05:56+00:00 Generalise GHC diagnostic code infrastructure This commit generalises the infrastructure used for diagnostic codes, allowing it to be used for other namespaces than the GHC namespace. In particular, this enables GHCi to re-use the same infrastructure to emit error messages. - - - - - bf4f5ad3 by Jade at 2025-01-18T10:05:56+00:00 Add structured errors to GHCi (#23338) This patch creates the 'GhciCommandErrorMessage' data type which implents the 'Diagnostic' class and also provides error code for these error conditions. - - - - - b6f54188 by Ben Gamari at 2025-01-18T12:38:46-05:00 Revert "Division by constants optimization" This appears to be responsible for the regression described in #25653. This reverts commit daff1e30219d136977c71f42e82ccc58c9013cfb. - - - - - 0fd90de8 by Ben Gamari at 2025-01-18T12:38:46-05:00 testsuite: Introduce div2 test This is a useful test from !8392 which is worth keeping around. - - - - - 32680979 by Ben Gamari at 2025-01-18T12:38:46-05:00 testsuite: Test shift correctness in mul2 test - - - - - 163aa50a by Ben Gamari at 2025-01-18T12:38:46-05:00 testsuite: Add regression test for #25653 - - - - - 44778963 by Matthew Pickering at 2025-01-20T11:23:08+00:00 driver: Store an ExternalModuleGraph in the EPS We now store an ExternalModuleGraph in the EPS. When an new interface is loaded, the module graph is extended with a node for the loaded interface. The result is a partial module graph. If you want to run a transitive closure query on the graph you must first force the transitive closure to be loaded by using `loadExternalGraphBelow`. The primary advantage (for now) is that the transitive dependency calculation does not have to be repeated in getLinkDeps. If your module had many dependencies and many splices, performing this calculation at every splice site took a significant amount of time. We might also want to use this module graph in future for considering questions such as reachability of rules or accessibilty of instance imported by levelled imported. This patch removes another place in the compiler where transitive dependency is calculated in an ad-hoc manner. In general, the transitive dependency calculation should be cached and computed using a ModuleGraph abstraction. The transitive dependency query required by getLinkDeps operates on a graph without hs-boot nodes. If a linkable from a module in a loop is needed, then all modules in the loop are necessary to be available to execute that module. Therefore there is a query in `ModuleGraph` and `ExternalModuleGraph` which allows a transitive closure query to be performed on a graph without loops. Fixes #25634 ------------------------- Metric Decrease: MultiLayerModulesTH_Make MultiLayerModulesTH_OneShot Metric Increase: mhu-perf ------------------------- Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita(a)gmail.com> - - - - - b3c0acfc by Cheng Shao at 2025-01-20T11:53:10-05:00 hie: fix hie.yaml to use default hie-bios script !13778 accidentally changed hie.yaml to use hie-bios.bat as the default hie-bios script, which completely breaks hie support on non-Windows platforms. This patch reverts that change. - - - - - 595013d4 by Ben Gamari at 2025-01-21T09:57:23-05:00 compiler: Fix CPP guards around ghc_unique_counter64 The `ghc_unique_counter64` symbol was introduced in the RTS in the 64-bit unique refactor (!10568) which has been backported to %9.6.7 and %9.8.4. Update the CPP to reflect this. Fixes #25576. - - - - - 09ee3247 by Ryan Scott at 2025-01-21T09:58:00-05:00 Fix :info pretty-printing of UNPACKed fields This patch: * Ensures that we do not pretty-print a field like `foo :: {-# UNPACK #-} !Int` as `foo :: ! {-# UNPACK -#} Int` (as we were doing before) when running the `:info` command. * Prevents coercions that arise from `UNPACK`ed fields (e.g., such as when one unpacks a newtype) from being printed in `:info` output unless `-dppr-debug` is enabled. Fixes #25651. - - - - - 6b7ea592 by Rodrigo Mesquita at 2025-01-21T16:10:35-05:00 driver: Store the HomePackageTable in a mutable reference This commit refactors the HomePackageTable and HomeUnitGraph: (1) It fixes a quadratic-in-the-number-of-modules space leak in upsweep (#25511) (2) And it reworks these structures into their own modules to simplify the driver. The refactor is driven by the introduction of IO in the HPT interface, but is a bit more aggressive in simplifying the interfaces to enforce correct usage (ie to avoid performance pitfalls). Specifically: - The `HomeUnitGraph` (HUG) is now in `GHC.Unit.Home.Graph` - The `HomePackageTable` (HPT) is now in `GHC.Unit.Home.PackageTable` - The HPT now stores an `IORef` with the table of loaded home package modules. - The interface to the HPT now requires IO - The interface now enforces that the HPT is a datastructure that only grows - This is not enforced in the interface, but, clients of the HPT should never care about there being more or less entries in the HPT when these additional entries are not relevant to their result. - The exception to the invariant that the HPT is monotonically increasing is `restrictHpt`, a function which is called at a "barrier point" (during which there are no other threads inspecting or inserting in the HPT). The invariant can be temporarily broken at this point (currently, after upsweep). This is safe because a single thread holds control over the structure (thus the invariant being broken is never observed). The hug_var and associated structures in the driver, which aimed to improve memory usage in the driver by updating in place a HUG during upsweep, are no longer required as the HPT entries in the HUG are now themselves mutable by construction. This was previously explained in Note [ModuleNameSet, efficiency and space leaks], which is no longer relevant and was deleted. Fixes #25511 Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com> ------------------------- Metric Decrease: MultiComponentModulesRecomp MultiLayerModulesRecomp ------------------------- - - - - - f983a00f by Jens Petersen at 2025-01-21T16:11:12-05:00 hp2ps/Utilities.c: add extern parameter types for malloc and realloc for C23 Fix build with gcc-15 which defaults to C23 standard (-std=gnu23) Fixes #25662 ``` utils/hp2ps/Utilities.c:6:14: error: warning: conflicting types for built-in function ‘malloc’; expected ‘void *(long unsigned int)’ [-Wbuiltin-declaration-mismatch] 6 | extern void* malloc(); | ^~~~~~ | 6 | extern void* malloc(); | ^ utils/hp2ps/Utilities.c:5:1: error: note: ‘malloc’ is declared in header ‘<stdlib.h>’ 4 | #include "Error.h" +++ |+#include <stdlib.h> 5 | | 5 | | ^ utils/hp2ps/Utilities.c: In function ‘xmalloc’: utils/hp2ps/Utilities.c:80:17: error: error: too many arguments to function ‘malloc’; expected 0, have 1 80 | r = (void*) malloc(n); | ^~~~~~ ~ | 80 | r = (void*) malloc(n); | ^ utils/hp2ps/Utilities.c:6:14: error: note: declared here 6 | extern void* malloc(); | ^~~~~~ | 6 | extern void* malloc(); | ^ utils/hp2ps/Utilities.c: In function ‘xrealloc’: utils/hp2ps/Utilities.c:92:18: error: warning: conflicting types for built-in function ‘realloc’; expected ‘void *(void *, long unsigned int)’ [-Wbuiltin-declaration-mismatch] 92 | extern void *realloc(); | ^~~~~~~ | 92 | extern void *realloc(); | ^ utils/hp2ps/Utilities.c:92:18: error: note: ‘realloc’ is declared in header ‘<stdlib.h>’ | 92 | extern void *realloc(); | ^ utils/hp2ps/Utilities.c:94:9: error: error: too many arguments to function ‘realloc’; expected 0, have 2 94 | r = realloc(p, n); | ^~~~~~~ ~ | 94 | r = realloc(p, n); | ^ utils/hp2ps/Utilities.c:92:18: error: note: declared here 92 | extern void *realloc(); | ^~~~~~~ | 92 | extern void *realloc(); | ^ ``` - - - - - 51e3ec83 by Vladislav Zavialov at 2025-01-22T20:41:32+03:00 Rework built-in and punned names (#25174, #25179, #25180, #25182) This patch rewrites part of the logic for dealing with built-in and punned names, making it more principled and fixing a few bugs. * Kill off filterCTuple. Its purpose was to improve pretty-printing of constraint tuples, and the appropriate place for this is namePun_maybe. * Remove unitTyCon, unboxedUnitTyCon, and soloTyCon from wiredInTyCons. Their inclusion in the list was a workaround for shoddy logic in lookupOrigNameCache. Now we treat tuples of all arities uniformly. * In isBuiltInOcc_maybe, only match on actual built-in syntax, e.g. "FUN" shouldn't be there (#25174). Also take ListTuplePuns into account (#25179). * When matching OccNames, use the ShortByteString directly to avoid potentially costly conversions to ByteString and String. * Introduce isInfiniteFamilyOrigName_maybe, a purpose-built helper for looking up tuples/sums in the OrigNameCache. This clears up the previously convoluted relation between the orig name cache and built-in syntax. * Reuse isKnownOrigName_maybe to eliminate the need for isPunOcc_maybe. * Classify MkSolo and MkSolo# as UserSyntax, thus fixing whole-module reexports (#25182). * Teach valid-hole-fits about tuples, unboxed tuples, and unboxed sums, up to a certain arity (#25180). * Drop the unnecessary special case for unary constraint tuples in the type checker (finish_tuple). It was a workaround for the lack of CSolo. * Update Notes and other comments, add tests. - - - - - 85c60aea by Teo Camarasu at 2025-01-23T18:06:21-05:00 doc: Add documentation for -XDoAndIfThenElse Resolves #18631 Co-authored-by: Richard Eisenberg <rae(a)cs.brynmawr.edu> - - - - - 4495e48f by Brandon Chinn at 2025-01-24T11:54:24-05:00 Break out GHC.Parser.Lexer.Interface - - - - - 4f8fc11e by Brandon Chinn at 2025-01-24T11:54:24-05:00 Fix lexing comments in multiline strings (#25609) Metric Decrease: MultiLayerModulesRecomp parsing001 - - - - - e7ab778f by Matthew Pickering at 2025-01-24T11:55:01-05:00 testsuite: Pass TEST_HC_OPTS to many more tests This passes `-dno-debug-output` to the test and `-dlint. - - - - - c3593101 by Sylvain Henry at 2025-01-24T23:12:20-05:00 Merge ghc-prim's modules into ghc-internal (#24453) ghc-internal becomes the only wired-in package exposing primitives. There are some minor GHC allocation regressions, but they barely cross the thresholds and only with the wasm backend. They're likely due to longer symbols (ghc-internal vs ghc-prim, GHC.Internal.X vs GHC.X). Metric Increase: T13035 T1969 T4801 T9961 - - - - - 70f7741a by Jens Petersen at 2025-01-24T23:12:58-05:00 hp2ps/Utilities.c: add extern parameter types for malloc and realloc for C23 use portable C types! - - - - - a1d92378 by Brandon Chinn at 2025-01-25T15:11:54-08:00 Fix for alex-3.5.2.0 (#25623) This INLINE pragma for alexScanUser was added in 9.12, but then I ported the change to alex in 3.5.2.0 (https://github.com/haskell/alex/pull/262) I didn't realize that GHC errors on duplicate INLINE pragmas, so this ended up being a breaking change. This change should be backported into 9.12 - - - - - 62760367 by ARATA Mizuki at 2025-01-27T16:23:06-05:00 x86 NCG: Make MOVD's output format explicit The old design led to inference of a wrong format, losing upper bits of a vector register. Fixes #25659 Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> - - - - - f19ab490 by Simon Hengel at 2025-01-27T16:23:45-05:00 doc: Correct JSON schema for `-fdiagnostics-as-json` (fixes #25393) - - - - - e16eae65 by Cheng Shao at 2025-01-27T21:41:39+00:00 hadrian: fix bootstrap with 9.12.1 This patch bumps hadrian index-state to fix bootstrap with 9.12.1. - - - - - 8071bad8 by Jeffrey Young at 2025-01-28T21:45:32-05:00 base: add SrcLoc changes to changelog, 4.21.0.0 I accidentally dropped this in !13381 - closes #25614 See: - ea4587794b9e3a098f9c02bd6cea2294af2539ce (the 13381 commit) - Issue #25614 - - - - - 9dcc7e28 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00 Rename `cloneBndrs` and such — now all the monadic ones have an `M` suffix. We now have `cloneBndrs` and `cloneRecIdBndrs` which take a `UniqSupply` argument, and `cloneBndrsM` and `cloneRecIdBndrsM` which rather have a `MonadUnique` constraint. - - - - - 643dd3d8 by Matthew Farkas-Dyck at 2025-01-29T02:27:48-05:00 Use `Infinite` in unique generation, and clean up some other partial uni patterns as well. Also drop the losing `instance MonadFail UniqSM`. We redefine `getUniquesM` in terms of `Infinite` rather than `[]`, and define another method `getUniqueListM` for the use sites where we actually want a `[]`. Thus, at many sites, we can avoid the partiality of the empty list case. We also define `withUniques`, `withUniquesM`, and `withUniquesM'`, which traverse an arbitrary `Traversable` structure and introduce a `Unique` for each element. This allows us to redefine various functions to operate on more appropriate types than `[]` and avoid further partiality (in the form of incomplete-uni-patterns). - - - - - dd0acc3c by M Farkas-Dyck at 2025-01-29T02:27:48-05:00 Use `Infinite` in `GHC.Tc.Deriv.Functor`. Make the list of variables to use in generated code `Infinite`, to avoid panicking on the (now impossible) empty list case. - - - - - 4e9adedf by M Farkas-Dyck at 2025-01-29T02:27:48-05:00 Use `Infinite` in `GHC.Runtime.Debugger`. Make the list of available names `Infinite`, to avoid panicking on the (now impossible) empty list case. - - - - - bed812b7 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00 Avoid incomplete-uni-patterns in `GHC.Cmm.DebugBlock`. We do so by changing the type of `BlockContext` to statically (in GHC) exclude the possibility of Cmm statics, and using `NonEmpty` lists of `BlockContext`s in `cmmDebugGen`. - - - - - 27587df3 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00 Avoid incomplete-uni-patterns in `GHC.Types.Literal`. We do so by introducing `mkLitNumberWrap'` whose ultimate codomain is `Integer` rather than `Literal`, and then use that rather than `mkLitNumberWrap` where we just need the number rather than the `Literal`. - - - - - 138de0ff by M Farkas-Dyck at 2025-01-29T02:27:48-05:00 Avoid incomplete-uni-patterns in `GHC.CmmToAsm.X86.CodeGen`. - Match the vector element list only once in `shuffleInstructions`. - Define `isSuitableFloatingPointLit_maybe` which returns `Just` the width if the lit is indeed suitable. - - - - - d8cb3d36 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00 Clean up more incomplete uni patterns. At some sites, we merely panic if the `[]` or `Maybe` is empty when we convert to `NonEmpty` or `Identity`, but at least now we make it explicit. At other sites, we are able to use more precise types and avoid the partiality altogether. To do so, we redefine various functions to operate over `Traversable` arguments, so we can use the appropriate shape where known. - - - - - f251bd22 by M Farkas-Dyck at 2025-01-29T02:27:48-05:00 Outline `expectJustPanic`. - - - - - a963a1a5 by Marc Scholten at 2025-01-29T02:28:35-05:00 base: Introduce Data.Enum.enumerate (CLC #306) https://github.com/haskell/core-libraries-committee/issues/306 - - - - - 944712da by Ben Gamari at 2025-01-29T02:29:13-05:00 base: Update description of locking behavior - - - - - 85abc69c by Ben Gamari at 2025-01-29T02:29:51-05:00 base: Fix @since annotation of Data.Bounded Fixes #25615. - - - - - 2ca41c62 by Ben Gamari at 2025-01-29T02:30:29-05:00 StgToByteCode: Fix overly-broad handling of Addr# literals Previously we assumed that all unlifted types were `Addr#` but this isn't true. As noted in #25638, unlifted nullary data constructor workers can also appear at the top-level and are obviously not of type `Addr#`. Note that there is more work to be done to properly handle unlifted data constructors (especially nullary; see #25636). However, this is a small step in the right direction. Closes #25641. - - - - - ec26c54d by Ben Gamari at 2025-01-29T02:30:29-05:00 StgToByteCode: Assert that PUSH_G'd values are lifted We currently do not support top-level unlifted data constructor applications, therefore this is a safe assertion. Pointed out by @sheaf. - - - - - 8847125f by Ben Gamari at 2025-01-29T02:31:07-05:00 gitlab-ci: Run test-primops testsuite in ~"full-ci" pipeline Closes #25654. - - - - - bf8c7d6e by Matthew Pickering at 2025-01-29T02:31:44-05:00 bytecode: Do not generate `SLIDE x 0` instructions SLIDE x 0 is a no-op as it means to shift x elements of the stack by no spaces. In the interpreter, this results in a loop which copies an array element into the same place. I have instrumented GHCi to count how many of these instructions are interpreted. The workload was `ghc` compiling two simple modules. Total no-op slides: 7793476 Total slides: 11413289 Percentage useless (slides): 68% Percentage uselss of total instructions: 9% - - - - - 7bfc93a7 by Zubin Duggal at 2025-01-29T21:41:17-05:00 hackage-doc-tarball: Allow ghc-boot-th to be uploaded to hackage It can't refer to files outside its source directory, so patch that part out. This is OK because those files are only used while bootstrapping. Also add ghci to the list of packages to be uploaded Fixes #25687 - - - - - 704eeb02 by Roman S at 2025-01-29T21:42:05-05:00 Fix Control.Arrow (***) diagram (fixes #25698) - - - - - 662645f0 by Matthew Pickering at 2025-02-03T11:44:41-05:00 compiler: Always load GHC.Data.FastString optimised into GHCi The FastString table is shared between the boot compiler and interpreted compiler. Therefore it's very important the representation of `FastString` matches in both cases. Otherwise, the interpreter will read a FastString from the shared variable but place the fields in the wrong place which leads to segfaults. Ideally this state would not be shared, but for now we can always compile both with `-O2` and this leads to a working interpreter. - - - - - 05e5785a by Peter Trommler at 2025-02-03T11:45:17-05:00 RTS: Fix compile on powerpc64 ELF v1 Cabal does not know about the different ABIs for powerpc64 and compiles StgCRunAsm.S unconditionally. The old make-based build system excluded this file from the build and it was OK to signal an error when it was compiled accidentally. With this patch we compile StgCRunAsm.S to an empty file, which fixes the build. Fixes #25700 - - - - - cbbb64fb by Matthew Pickering at 2025-02-03T23:40:33-05:00 interpreter: Always print unit and module name in BCO_NAME instruction Currently the BCO_Name instruction is a bit difficult to use since the names are not qualified by the module they come from. When you have a very generic name such as "wildX4", it becomes impossible to work out which module the identifier comes from. Fixes #25694 - - - - - 764a43ac by Ben Gamari at 2025-02-03T23:41:10-05:00 upload-ghc-libs: Drop more references to ghc-internal from ghc-boot-th (cherry picked from commit afec4b75c2d0e9f5c462a86d9f3697acf30355c7) Co-authored-by: Ben Gamari <bgamari.foss(a)gmail.com> - - - - - 9a59b026 by Ben Gamari at 2025-02-04T10:00:18-05:00 gitlab-ci: Don't use .full-ci to run test-primops test-primops depends upon the existence of validate jobs, yet these do not exist in the context of nightly jobs, which .full-ci includes. - - - - - 7cc08550 by Ben Gamari at 2025-02-04T18:34:49-05:00 CorePrep: Name `sat` binders more descriptively - - - - - fb40981d by Ben Gamari at 2025-02-04T18:35:26-05:00 ghc-toolchain: Parse i686 triples This is a moniker used for later 32-bit x86 implementations (Pentium Pro and later). Fixes #25691. - - - - - 02794411 by Cheng Shao at 2025-02-04T18:36:03-05:00 compiler: remove unused assembleOneBCO function This patch removes the unused assembleOneBCO function from the bytecode assembler. - - - - - db19c8a9 by Matthew Pickering at 2025-02-05T23:16:50-05:00 perf: Replace uses of genericLength with strictGenericLength genericLength is a recursive function and marked NOINLINE. It is not going to specialise. In profiles, it can be seen that 3% of total compilation time when computing bytecode is spend calling this non-specialised function. In addition, we can simplify `addListToSS` to avoid traversing the input list twice and also allocating an intermediate list (after the call to reverse). Overall these changes reduce the time spend in 'assembleBCOs' from 5.61s to 3.88s. Allocations drop from 8GB to 5.3G. Fixes #25706 - - - - - 5622a14a by Matthew Pickering at 2025-02-05T23:17:27-05:00 perf: nameToCLabel: Directly manipulate ByteString rather than going via strings `nameToCLabel` is called from `lookupHsSymbol` many times during bytecode linking. We can save a lot of allocations and time by directly manipulating the bytestrings rather than going via intermediate lists. Before: 2GB allocation, 1.11s After: 260MB allocation, 375ms Fixes #25719 ------------------------- Metric Decrease: MultiLayerModulesTH_OneShot ------------------------- - - - - - 66c7f656 by Matthew Pickering at 2025-02-06T17:15:25-05:00 interpreter: Fix INTERP_STATS profiling code The profiling code had slightly bitrotted since the last time it was used. This just fixes things so that if you toggle the INTERP_STATS macro then it just works and prints out the stats. Fixes #25695 - - - - - f71c2835 by Matthew Pickering at 2025-02-06T17:16:02-05:00 perf: Key the interpreter symbol cache by Name rather than FastString Profiles showed that about 0.2s was being spend constructing the keys before looking up values in the old symbol cache. The performance of this codepath is critical as it translates directly to a delay when a user evaluates a function like `main` in the interpreter. Therefore we implement a solution which keys the cache(s) by `Name` rather than the symbol directly, so the cache can be consulted before the symbol is constructed. Fixes #25731 - - - - - 8f8d3a90 by Ben Gamari at 2025-02-08T01:17:28-05:00 base: Label threads forked by IO operations Addresses part of #25452. Addresses core-libraries-committee#305. - - - - - 28600825 by Ben Gamari at 2025-02-08T01:17:28-05:00 base: Label threads forked by System.Timeout Addresses part of #25452. Addresses core-libraries-committee#305. - - - - - 8a249827 by Ben Gamari at 2025-02-08T01:17:28-05:00 base: Label signal handling threads Addresses part of #25452. Addresses core-libraries-committee#305. - - - - - 26af26f0 by Ben Gamari at 2025-02-08T01:17:28-05:00 base: Label Windows console event handling threads Addresses part of #25452. Addresses core-libraries-committee#305. - - - - - bf9c3d4f by Ben Gamari at 2025-02-08T01:17:28-05:00 ghci: Label evaluation sandbox thread Addresses part of #25452. Addresses core-libraries-committee#305. - - - - - 38f78ce5 by Ben Gamari at 2025-02-08T01:17:28-05:00 base: Add changelog entry for addition of thread labels Addresses #25452. Addresses core-libraries-committee#305. - - - - - c100deb5 by Ben Gamari at 2025-02-08T01:18:05-05:00 gen-ci: Clean up style This cleans up a number of stylistic inconsistencies although it's still far from perfect. - - - - - c4a7680a by Ben Gamari at 2025-02-08T01:18:05-05:00 gen-ci: Properly encapsulate GitLab predicates - - - - - 52b6539b by M Farkas-Dyck at 2025-02-08T11:34:51-08:00 Avoid partiality in `Language.Haskell.Syntax.Expr`, `GHC.Hs.Expr`, `GHC.Rename.Expr`, etc. In particular, use `NonEmpty` where appropriate: - the argument of `FieldLabelString` - the argument of `HsMultiIf` - `grhssGRHSs` Decreases overall compile-time allocation by about 0.1% in the benchmark suite (min -0.8%, max +0.3%). Metric Decrease: T3294 - - - - - a566da92 by Ben Gamari at 2025-02-10T03:21:49-05:00 gitlab-ci: Bump docker images Closes #25693. - - - - - a7e23f01 by Ben Gamari at 2025-02-10T03:21:49-05:00 hadrian: Drop uses of head/tail To silence warnings with GHC 9.10 - - - - - 12752f0c by Ben Gamari at 2025-02-10T03:21:49-05:00 hadrian: Disable x-data-list-nonempty-unzip warning - - - - - e22a14fc by Simon Peyton Jones at 2025-02-11T16:21:10+00:00 Deal correctly with Given CallStack constraints As #25675 showed, the CallStack solving mechanism was failing to account for Given CallStack constraints. This small patch fixes it and improves the Notes. Small improvement to GHCi debugger output in break011, break024, which is discussed on the MR !13883 - - - - - db3e810f by Simon Peyton Jones at 2025-02-12T09:12:30-05:00 Fix inlineBoringOk again This MR fixes #25713, which turned out to be a consequence of not completing #17182. I think I have now gotten it right. See the new Note [inlineBoringOk] - - - - - ef0e6cfc by Ben Gamari at 2025-02-17T19:20:09-05:00 testsuite: Mark T23071 and T2047 as fragile on FreeBSD These inexplicably fail on FreeBSD on CI. Sadly I am unable to reproduce this locally but regardless this is holding up Marge so I will mark them as fragile for now. Addresses #25751. - - - - - 7596675e by Jens Petersen at 2025-02-18T08:53:08-05:00 hp2ps Utilities.c: include stdlib.h instead of extern malloc and realloc - - - - - 975d932c by Rodrigo Mesquita at 2025-02-18T08:53:45-05:00 Inline join points for rhs without free vars While investigating #25170, we ran into a program (T16473) that allocated 67% more because of a join point that failed to inline. Note [Duplicating join points] explains why we want to be conservative when inlining join points, using as an example a join point that captures a free variable `f` that becomes available in the continuation `blah` for further optimisations, as opposed to being lambda-abstracted. However, when the RHS of the join point has no free variables and is trivial, the same argument does not apply, and there's nothing to gain from preserving it. On the contrary, not inlining these trivial join points such as $j f x = K f x |> co can be actively harmful as they prevent useful optimisations from firing on the known constructor application. #25723 is such an example. Therefore, we've extended `uncondInlineJoin` to allow duplicating such closed trivial join points. See the updated Note [Duplicating join points] for further details. Additionally, merge the guards in uncondInlineJoin for point DJ3(b) anad DJ3(c) of Note [Duplicating join points] to avoid an unnecessary traversal in the call to `collectArgs`; it's also more uniform. Co-authored-by: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Fixes #25723 - - - - - 78de1a55 by M Farkas-Dyck at 2025-02-18T08:54:31-05:00 Scrub some partiality in `GHC.Tc.Gen.Match`. In particular, we construct a list of the same length as another list, then loop over both and panic if their lengths are unequal. We can avoid this. - - - - - 1dfe9325 by M Farkas-Dyck at 2025-02-18T08:54:31-05:00 Make list of `ParStmtBlock` in `ParStmt` `NonEmpty`. In the ParStmt constructor Language.Haskell.Syntax.Expr.StmtLR, the 2nd argument, the list of ParStmtBlocks, must be NonEmpty; make it so. - - - - - 0e3575b5 by M Farkas-Dyck at 2025-02-18T08:54:31-05:00 GHC.Tc.Gen.Match: Added type signatures for `loop` functions. - - - - - c9ffcfee by sternenseemann at 2025-02-18T08:55:14-05:00 GHC: fix reference to function in Note [Target code interpreter] As far as I could tell, setSessionDynFlags doesn't deal with hsc_interp. Also added a backreference so this will be updated in the future. - - - - - ab77fc8c by sheaf at 2025-02-18T08:55:57-05:00 Account for skolem escape in mightEqualLater This commit: 1. Refactors checkTyEqRhs to allow it be called in pure contexts, which means it skips doing any on-the-fly promotion. 2. Calls checkTyEqRhs in mightEqualLater to check whether it a MetaTv can unify with a RHS or whether that would cause e.g. skolem escape errors or concreteness errors. Fixes #25744 - - - - - cb8a06a4 by Sylvain Henry at 2025-02-18T08:56:52-05:00 Remove a bunch of Makefiles from old build system - - - - - e12d6b39 by M Farkas-Dyck at 2025-02-18T08:57:37-05:00 Totalize `GHC.HsToCore.Match.matchWrappers.initNablasGRHSs`. Converting from `NonEmpty` to `[]` and back is totally needless. - - - - - cd2be3be by Matthew Pickering at 2025-02-18T08:58:14-05:00 interpreter: Always print uniques for BCO_NAME labels In the previous commit I omitted to include the unique, which still makes it very difficult to trace back where the BCO came from. - - - - - c4e112fc by Matthew Pickering at 2025-02-18T08:58:51-05:00 interpreter: Fix overflows and reentrancy in statistics calculation 1. Use unsigned long for counter, as they can easily overflow if you are running a long benchmark. 2. Make interp_shutdown reentrant by copying the command frequency table into an array. Fixes #25756 - - - - - 70ac6222 by M Farkas-Dyck at 2025-02-18T14:22:06-08:00 Use `Foldable1` where appropriate, avoiding much needless panicking. In some cases, where not readily feasible to modify code to use `NonEmpty`, merely use `expectNonEmpty` to make explicit we are panicking if we have an empty list. - - - - - a3f0a506 by Sylvain Henry at 2025-02-19T05:27:30-05:00 Testsuite: fix deprecation warning > DeprecationWarning: 'count' is passed as positional argument - - - - - ef5470a2 by Ben Gamari at 2025-02-19T16:30:53+00:00 Cmm/Parser: Add surface syntax for Mul2 MachOps These are otherwise very hard to test in isolation. - - - - - 59b9307b by Cheng Shao at 2025-02-19T20:24:40-05:00 testsuite: fix InternalCounters test with +debug_ghc The `InternalCounters` test case fails when ghc is built with `+debug_ghc`. This patch skips it in that case and allows the testsuite to pass for the `+debug_ghc` flavour transformer. - - - - - aa69187d by M Farkas-Dyck at 2025-02-19T20:25:31-05:00 Scrub a use of `head` in `GHC.Driver.Make.downsweep_imports.checkDuplicates`. - - - - - 1c8e608a by Cheng Shao at 2025-02-21T20:18:41-05:00 compiler: use fromAscList when applicable This patch uses fromAscList (with O(n) complexity) instead of fromList (with O(nlogn) complexity) in certain Binary instances. It's safe to do so since the corresponding serialization logic is based on toList (same as toAscList). - - - - - 549e0aff by Ben Gamari at 2025-02-21T20:19:18-05:00 rts/linker/MachO: Mark internal symbols as static There is no reason why these should have external linkage. - - - - - fbf3d020 by Cheng Shao at 2025-02-22T07:41:01-05:00 wasm: bump dyld v8 heap size limit This patch sets `--max-old-space-size=65536` as wasm dyld shebang arguments to lessen v8 heap pressure in certain workloads that load the full ghc package. It doesn't really commit 64G memory but it does help reduce v8 gc overhead. - - - - - cb60da24 by Cheng Shao at 2025-02-22T07:41:01-05:00 wasm: fix dyld for shared libraries created by llvm 20.x This patch fixes wasm dyld script for shared libraries created by llvm 20.x. The __wasm_apply_data_relocs function is now optional and may be omitted for shared libraries without any runtime relocatable data segments, so only call __wasm_apply_data_relocs when it's present. - - - - - 7eea38c8 by Cheng Shao at 2025-02-22T07:41:37-05:00 driver: fix wasm backend sysroot lookup logic when -flto is passed For the wasm target, the driver calls `wasm32-wasi-clang --print-search-dirs` and finds the sysroot directory that contains libc.so etc, then passes the directory path to dyld. However, when GHC is configured with -flto as a part of C/C++ compiler flags, the clang driver would insert a llvm-lto specific directory in the --print-search-dirs output and the driver didn't take that into account. This patch fixes it and always selects the non-lto sysroot directory to be passed to dyld. This is one small step towards supporting building all cbits with lto for wasm. - - - - - f3bfe31e by Cheng Shao at 2025-02-23T14:06:25-05:00 wasm: add Note [Variable passing in JSFFI] as !13583 follow up This patch adds a note to explain how the magic variables like `__ghc_wasm_jsffi_dyld` are brought into scope of JSFFI code snippets, as follow up work of !13583. - - - - - c318be56 by Cheng Shao at 2025-02-23T14:07:02-05:00 libffi: update to 3.4.7 Bumps libffi submodule. - - - - - 33aca30f by sheaf at 2025-02-25T08:58:46-05:00 LLVM: account for register type in funPrologue We were not properly accounting for the live register type of global registers in GHC.CmmToLlvm.CodeGen.funPrologue. This meant that we could allocated a register at type <4 x i32> but try to write to it at type <8 x i16>, which LLVM doesn't much like. This patch fixes that by inserting intermerdiate casts when necessary. Fixes #25730 - - - - - 0eb58b0e by sheaf at 2025-02-25T08:59:29-05:00 base: make Data.List.NonEmpty.unzip match Data.List This commit makes Data.List.NonEmpty.unzip match the implementation of Data.List, as was suggested in approved CLC proposal #107. - - - - - f4da90f1 by Matthew Pickering at 2025-02-25T14:11:21-05:00 interpreter: Fix underflow frame lookups BCOs can be nested, resulting in nested BCO stack frames where the inner most stack frame can refer to variables stored on earlier stack frames via the PUSH_L instruction. |---------| | BCO_1 | -<-┐ |---------| ......... | |---------| | PUSH_L <n> | BCO_N | ->-┘ |---------| Here BCO_N is syntactically nested within the code for BCO_1 and will result in code that references the prior stack frame of BCO_1 for some of it's local variables. If a stack overflow happens between the creation of the stack frame for BCO_1 and BCO_N the RTS might move BCO_N to a new stack chunk while leaving BCO_1 in place, invalidating a simple offset based reference to the outer stack frames. Therefore `ReadSpW` first performs a bounds check to ensure that accesses onto the stack will succeed. If the target address would not be a valid location for the current stack chunk then `slow_spw` function is called, which dereferences the underflow frame to adjust the offset before performing the lookup. ┌->--x | CHK_1 | | CHK_2 | | | |---------| |---------| | └-> | BCO_1 | | UD_FLOW | -- x |---------| |---------| | | ...... | | |---------| | PUSH_L <n> | BCO_ N | ->-┘ |---------| Fixes #25750 - - - - - c3f2d284 by Vladislav Zavialov at 2025-02-25T14:11:58-05:00 Remove ArgPatBuilder ArgPatBuilder in Parser/PostProcess.hs became redundant with the introduction of InvisPat (36a75b80eb). This small refactoring removes it. - - - - - 0f2241e9 by sheaf at 2025-02-25T19:23:21-05:00 Propagate long distance info to guarded let binds This commit ensures that we propagate the enclosing long distance information to let bindings inside guards, in order to get accurate pattern-match checking warnings, in particular incomplete record selector warnings. Example: data D = K0 | K1 { fld :: Int } f :: D -> Int f d@(K1 {}) | let i = fld d = i f _ = 3 We now correctly recognise that the field selector 'fld' cannot fail, due to the outer pattern match which guarantees that the value 'd' has the field 'fld'. Fixes #25749 - - - - - 64b0d4d0 by Fangyi Zhou at 2025-02-25T19:24:07-05:00 wasm: use primitive opcodes for fabs and sqrt - Add new `WasmInstr` constructor `WasmSqrt` for sqrt, corresponding to primitivie operations in wasm. - When lowering CallishMachOp, use `WasmAbs` and `WasmSqrt` for F32 and F64 fabs and sqrt. - - - - - 272eaef0 by Cheng Shao at 2025-02-25T19:24:43-05:00 hadrian: enable building stage1 haddock for cross ghc This commit enables building stage1 haddock for cross ghc. Without this change, hadrian would panic with "Unknown program" error when building the _build/stage1/bin/cross-prefix-haddock program needed by the docs-haddock target, even if it only needs to copy from _build/stage0/bin/cross-prefix-haddock. - - - - - a794e733 by Cheng Shao at 2025-02-25T19:24:43-05:00 hadrian: enable building docs for cross targets Hadrian used to omit the docs target as a part of binary-dist-dir for cross targets. This commit enables docs to be built as a part of cross bindists and it works just fine in CI. - - - - - 6dba56e1 by Cheng Shao at 2025-02-25T19:24:43-05:00 ci: build haddock/sphinx-html for wasm jobs This commit enables building haddock & sphinx-html documentation for wasm targets. The docs are useful for end users and should be tested in CI. I've omitted pdf & manpage generation for the wasm target; I've never found the pdf version of docs to be useful, and the manpage only contains `ghc.1` where we really want `wasm32-wasi-ghc.1` but that should be a separate issue to fix. - - - - - 2d6a63ab by Cheng Shao at 2025-02-25T19:25:20-05:00 ghci: remove unused showBreakArray function GHCi.BreakArray.showBreakArray is not used anywhere, hence the housecleaning. - - - - - b228fcb5 by Cheng Shao at 2025-02-25T19:25:57-05:00 ghc-heap: fix HalfWord incompatible Binary instances for cross GHC ghc-heap defines HalfWord as Word32/Word16 depending on host word size. For cross GHC with different host/target word sizes, the Binary instances are incompatible and breaks iserv serialization of any message type that involves HalfWord, breaking the ghci debugger. This patch fixes the issue and has been tested to fix ghci debugger functionality of the wasm backend. Fixes #25420 #25781. - - - - - ec02f8c2 by Rodrigo Mesquita at 2025-02-26T11:03:38-05:00 ghci-debugger: display thunks provenance if avail Improves reporting on ghci breakpoints when IPE information is available by printing, next to the thunk, the source file and src span where the thunk originated. Closes #25746 - - - - - 6acaff2b by Vladislav Zavialov at 2025-02-26T11:04:15-05:00 Tidy up error messages for TypeAbstractions 1. Print the '@' symbol before invisible patterns and improve phrasing: T24557c.hs:8:4: error: [GHC-11983] - Invisible type pattern pat is not allowed here + Illegal invisible type pattern: @pat + An invisible type pattern must occur in an argument position. 2. Use a single error code for all type abstractions deemed illegal due to the TypeAbstractions extension being disabled. Before this change: * [GHC-78249] was used in function equations, lambdas * [GHC-17916] was used in constructor patterns After this change: * [GHC-78249] is used to report all illegal type abstractions * [GHC-17916] is no longer used There was no reason for both error codes to exist and this distinction was a source of complexity in GHC/Tc/Errors/* and GHC/Rename/Pat.hs 3. Group the different "invisible type pattern" error constructors under a single parent constructor, TcRnIllegalInvisibleTypePattern containing BadInvisPatReason - - - - - 1ce9502e by Ben Gamari at 2025-02-27T04:48:29-05:00 haddock/doc: Drop version and release We currently have no way of keeping this up-to-date with the project version - - - - - 7f358f25 by Matthew Pickering at 2025-02-27T04:49:06-05:00 testsuite: Add test for :steplocal performance This adds a simple test which exercises #25779 - - - - - a6a3ffa6 by Sven Tennie at 2025-02-27T23:34:47-05:00 Do not deallocate stack for jump/switch table jumps Though the name is misleading, we consider them to be branching. For branch instructions we do not deallocate (parts of) the stack, but keep the stack pointer (sp) intact. - - - - - 39e51ddb by Sven Tennie at 2025-02-27T23:34:47-05:00 Add reproducer for dealloc instructions in switch table jump expressions (#25733) Measures taken to make the test stable: - Use 'a' as variable prefix, because X86 32bit stumbled over the variable name 'i386' - Flush stdout to make test output deterministic - Use type annotations to support 32bit archs - - - - - d427df93 by Sylvain Henry at 2025-02-27T23:35:30-05:00 Remove redundant location strings in expectJust and friends (#25743) Now we can use HasDebugCallStack instead to avoid cluttering the code with strings and to avoid maintaining those strings (e.g. renaming them when functions are renamed...). - - - - - 90f1190e by Ben Gamari at 2025-02-28T20:53:53-05:00 compiler: Add export list to GHC.SysTools.Tasks - - - - - ec826009 by Ben Gamari at 2025-02-28T20:53:53-05:00 compiler: Pass --target to llvm-as As noted in #25793, this is necessary due to potential ambiguity on Apple machines with Rosetta. - - - - - 9c1647d1 by Andreas Klebinger at 2025-02-28T20:54:30-05:00 cmmMachOpFoldM: Add missing pattern matches for bitcasts. Fixes #25771 - - - - - 3b78e139 by John Ericson at 2025-03-03T15:27:39-05:00 Remove most of `GHC.Internal.Pack` Since bd82ac9f4716e28b185758ae514691d5a50c003f when `GHC.Pack` was deleted, it is no longer used except for one function by the RTS. - - - - - b4fe0850 by Rodrigo Mesquita at 2025-03-03T15:28:16-05:00 ghci: Don't set virtualCWD on every iteration The calls to withVirtualCWD were introduced to fix #2973, but this bug is no longer reproducible, even when `withVirtualCWD` is dropped. This cleanup was originally motivated by the performance of :steplocal, but the performance problem has now been fixed at its root in the next commit. Even then, `withVirtualCWD` seems to now be an unnecessary artifact, and removing it simplifies the interpreter with no apparent drawbacks (testsuite is also happy with this change) - - - - - 73ba1e6e by Rodrigo Mesquita at 2025-03-03T15:28:16-05:00 ghci debugger: improve break/resume control flow After interpreting bytecode (`evalStmt`), we may want to hand off control to "GHCi.UI" in order to display an interactive break prompt: 1. When an /active/ breakpoint (one set with :break ...) is hit 2. At any breakpoint, when using :step from a breakpoint 3. At any breakpoint in the same function f, when :steplocal is called from a breakpoint in f 4. At any breakpoint in the same module, when :stepmodule is used Whether to pass control to the UI is now fully determined by `handleRunStatus` which transforms an `EvalStatus_` into an `ExecResult`. When `ExecBreak` is returned from `handleRunStatus` to GHCi, it always means GHCi breaks. `handleRunStatus` determines whether to loop and resume evaluation right away, or when to return to GHCi (by returning `ExecBreak` or `ExecComplete`). - (1) is queried using the `BreakpointStatus` message (the `breakpointStatus` call) - (2,3,4) are determined by the predicate `breakHere step span`, which inspects the improved `SingleStep` type to determine whether we care about this breakpoint even if it is not active. This refactor solves two big performance problems with the previous control flow: - We no longer call `withArgs/withProgram` repeatedly in the break/resume loop, but rather just once "at the top". - We now avoid computing the expensive `bindLocalsAtBreakpoint` for breakpoints we'd never inspect. In the interpreter_steplocal test added, calling `:steplocal` after breaking on `main = fib 25` now takes 12 seconds rather than 49 seconds on my machine. ``` interpreter_steplocal(ghci) ghc/alloc 6,124,821,176 540,181,392 -91.2% GOOD ``` Fixes #25779 ------------------------- Metric Decrease: interpreter_steplocal ------------------------- - - - - - c78d8f55 by Cheng Shao at 2025-03-03T20:54:41+00:00 rts: fix top handler closure type signatures This commit fixes the runIO/runNonIO closure type signatures in the RTS which should be extern StgClosure. This allows us to remove an unnecessary type cast in the C foreign desugaring logic, as well as unneeded complications of JSFFI desugaring logic that also needs to generate C stubs that may refer to those top handler closures. Otherwise, we'll have to take special care to avoid generating "extern StgClosure" declarations for them as we would for other closures, just to avoid conflicting type signature error at stub compile time. - - - - - a204df3a by Cheng Shao at 2025-03-03T20:54:41+00:00 compiler: allow arbitrary label string for JSFFI exports This commit allows arbitrary label string to appear in a foreign export declaration, as long as the calling convention is javascript. Well, doesn't make sense to enforce it's a C function symbol for a JSFFI declaration anyway, and it gets in the way of implementing the "sync" flavour of exports. - - - - - 03ebab52 by Cheng Shao at 2025-03-03T20:54:41+00:00 compiler: wasm backend JSFFI sync exports This commit implements the synchronous flavour of the wasm backend JSFFI exports: - `foreign export javascript "foo sync"` exports a top-level Haskell binding as a synchronous JS function - `foreign import javascript "wrapper sync"` dynamically exports a Haskell function closure as a synchronous JS function - `foreign import javascript unsafe` is now re-entrant by lowering to a safe ccall - Also fix the issue that JSFFI dynamic exports didn't really work in TH & ghci (#25473) - - - - - b6ae908b by Cheng Shao at 2025-03-03T20:54:41+00:00 testsuite: test wasm backend JSFFI sync exports This commit repurposes some existing JSFFI test cases to make them cover JSFFI sync exports as well. - - - - - edae2874 by Cheng Shao at 2025-03-03T20:54:41+00:00 docs: document wasm backend JSFFI sync exports This commit updates wasm backend documentation to reflect the new JSFFI sync exports feature. - - - - - 9b54eecb by Cheng Shao at 2025-03-03T20:56:21+00:00 wasm: add error message to WouldBlockException This commit attaches an error message to WouldBlockException, for now the error message consists of the JS async import code snippet that thunk is trying to block for. This is useful for debugging synchronous callbacks that accidentally call an async JS function. - - - - - c331eebf by Cheng Shao at 2025-03-04T09:11:45-05:00 compiler: avoid overwriting existing writers in putWithTables This patch makes `putWithTables` avoid overwriting all existing UserData writers in the handle. This is crucial for GHC API users that use putWithUserData/getWithUserData for serialization logic that involve Names. - - - - - e9b7802b by Matthew Pickering at 2025-03-04T09:12:21-05:00 ghci: Serialise mi_top_env When loading core from interface files (or from a bytecode object in future) it's important to store what the top-level context of a module is. Otherwise, when you load the module into GHCi from the interface files, only exported identifiers from the top-level module are in scope on the repl. See the added test which demonstrates what this enables. The context at the GHCi prompt is everything that's in-scope in the TopEnvIface module. Since TopEnvIface imports identifier "a", we can evaluate "a" in the repl. In addition to all this, we can use this information in order to implement reifyModule in a more principled manner. This becomes even more important when you're debugging and what to set break-points on functions which are not imported. - - - - - 73e02068 by Matthew Pickering at 2025-03-04T09:12:21-05:00 Implement reifyModule in terms of mi_top_env mi_top_env provides precisely the information that reifyModule needs, the user written imports. This is important as it unblocks !9604 and #22188 Fixes #8489 - - - - - 0a99825d by Ben Gamari at 2025-03-04T09:12:57-05:00 hadrian: Refactor handling of test suite environment Previously we would set the environment variables used to run the testsuite driver using `setEnv` to set them in the Hadrian process. While looking into failures of a fix to #25752 I noticed this and took the opportunity to refactor. - - - - - 7ca72844 by Alan Zimmerman at 2025-03-04T09:13:34-05:00 [EPA] Sync with the ghc-exactprint repo This brings it into line with the changes in https://hackage.haskell.org/package/ghc-exactprint-1.12.0.0 But also keeps the latest changes from master. - - - - - 8f6cc90c by Matthew Pickering at 2025-03-05T04:48:02-05:00 perf: Speed up the bytecode assembler This commit contains a number of optimisations to the bytecode assembler. In programs which generate a large amount of bytecode, the assembler is called a lot of times on many instructions. 1. Specialise the assembleI function for the two intepreters to avoid having to materialise the intermediate free-monad like structure. 2. Directly compute the UArray and SmallArray needed rather than going via the intermediate SizedSeq 3. Use optimised monads 4. Define unrolled "any" and "mapM6" functions which can be inlined and avoid calling recursive functions. The resulting generated code is much more direct. Before: ./ByteCodeAsm /home/matt/ghc-profiling-light/_build/stage1/lib/ +RTS -s 48,923,125,664 bytes allocated in the heap 678,221,152 bytes copied during GC 395,648 bytes maximum residency (2 sample(s)) 50,040 bytes maximum slop 6 MiB total memory in use (0 MiB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 11731 colls, 0 par 0.419s 0.425s 0.0000s 0.0004s Gen 1 2 colls, 0 par 0.001s 0.001s 0.0007s 0.0012s INIT time 0.000s ( 0.000s elapsed) MUT time 6.466s ( 6.484s elapsed) GC time 0.421s ( 0.426s elapsed) EXIT time 0.000s ( 0.000s elapsed) Total time 6.887s ( 6.910s elapsed) After: 1,518,321,200 bytes allocated in the heap 4,299,552 bytes copied during GC 322,288 bytes maximum residency (2 sample(s)) 50,280 bytes maximum slop 6 MiB total memory in use (0 MiB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 369 colls, 0 par 0.003s 0.003s 0.0000s 0.0002s Gen 1 2 colls, 0 par 0.001s 0.001s 0.0007s 0.0012s INIT time 0.001s ( 0.001s elapsed) MUT time 0.465s ( 0.466s elapsed) GC time 0.004s ( 0.004s elapsed) EXIT time 0.000s ( 0.000s elapsed) Total time 0.470s ( 0.471s elapsed) - - - - - f2d43e11 by Teo Camarasu at 2025-03-05T04:48:40-05:00 ghc-boot-th: expose all TH packages from proper GHC.Boot.* modules Previously we defined some modules here in the GHC.Internal namespace. Others were merely re-exposed from GHC.Internal. Re-exposed modules weren't handled correctly by Haddock, so the Haddocks for the `template-haskell` library couldn't see them. This change also makes the home package of these modules a bit clearer. Work towards #25705 - - - - - 91ef82df by Teo Camarasu at 2025-03-05T04:48:40-05:00 ghc-boot-th: fix synopsis formatting `@...@` syntax doesn't seem to work in synposes and is just kept by Haddock verbatim. - - - - - eb9fe1ec by Brandon Chinn at 2025-03-05T04:49:17-05:00 Collapse string gaps as \& (#25784) In 9.10, "\65\ \0" would result in "A0", but in 9.12, it results in "\650", due to the string refactoring I did in !13128. Previously, we were resolving escape codes and collapsing string gaps as we come across them, but after the refactor, string processing is broken out into phases, which is both more readable and useful for multiline strings. - - - - - 8037f487 by Cheng Shao at 2025-03-05T04:49:54-05:00 ghc-experimental: make JSVal abstract in GHC.Wasm.Prim This commit makes JSVal an abstract type in the export list of GHC.Wasm.Prim. JSVal's internal representation is supposed to be a non user facing implementation detail subject to change at any time. We should only expose things that are newtypes of JSVal, not JSVal itself. - - - - - 4f342431 by Cheng Shao at 2025-03-05T04:49:54-05:00 wasm: make JSVal internal Weak# point to lifted JSVal JSVal has an internal Weak# with the unlifted JSVal# object as key to arrange its builtin finalization logic. The Weak# used to designate Unit_closure as a dummy value; now this commit designates the lifted JSVal closure as the Weak# value. This allows the implementation of mkWeakJSVal which can be used to observe the liveliness of a JSVal and attach a user-specified finalizer. - - - - - 55af20e6 by Cheng Shao at 2025-03-05T04:49:54-05:00 ghc-experimental: add mkWeakJSVal This commit adds a mkWeakJSVal function that can be used to set up a Weak pointer with a JSVal key to observe the key's lifetime and optionally attach a finalizer. - - - - - 8273d7d1 by Matthew Pickering at 2025-03-05T04:50:30-05:00 simplifier: Zap Id unfoldings before constructing InScopeSet in simpleOptExpr Care must be taken to remove unfoldings from `Var`s collected by exprFreeVars before using them to construct an in-scope set hence `zapIdUnfolding` in `init_subst`. Consider calling `simpleOptExpr` on an expression like ``` case x of (a,b) -> (x,a) ``` * One of those two occurrences of x has an unfolding (the one in (x,a), with unfolding x = (a,b)) and the other does not. (Inside a case GHC adds unfolding-info to the scrutinee's Id.) * But exprFreeVars just builds a set, so it's a bit random which occurrence is collected. * Then simpleOptExpr replaces each occurrence of x with the one in the in-scope set. * Bad bad bad: then the x in case x of ... may be replaced with a version that has an unfolding. Fixes #25790 - - - - - 07fe6d1d by Rodrigo Mesquita at 2025-03-05T04:51:07-05:00 docs: Fix ghci :doc documentation Fixes #25799 - - - - - a510b861 by Matthew Pickering at 2025-03-06T11:43:23+00:00 Add flag to control whether self-recompilation information is written to interface This patch adds the flag -fwrite-if-self-recomp which controls whether interface files contain the information necessary to answer the question: Do I need to recompile myself or is this current interface file suitable? Why? Most packages are only built once either by a distribution or cabal and then placed into an immutable store, after which we will never ask this question. Therefore we can derive two benefits from omitting this information. * Primary motivation: It vastly reduces the surface area for creating non-deterministic interface files. See issue #10424 which motivated a proper fix to that issue. Distributions have long contained versions of GHC which just have broken self-recompilation checking (in order to get deterministic interface files). * Secondary motivation: This reduces the size of interface files slightly.. the `mi_usages` field can be quite big but probably this isn't such a great benefit. * Third motivation: Conceptually clarity about which parts of an interface file are used in order to **communicate** with subsequent packages about the **interface** for a module. And which parts are used to self-communicate during recompilation checking. The main tracking issue is #22188 but fixes issues such as #10424 in a proper way. - - - - - 5b05c27b by Matthew Pickering at 2025-03-06T11:43:23+00:00 Disable self recomp in release flavour The interface files that we distribute should not contain any information which is used by the recompilation checking logic since source file will never be compiled again. I am not 100% sure this won't cause unexpected issues, there many be downstream consumers which are incorrectly using the information from interfaces, but this commit can be reverted if we detect issues. - - - - - 1d4c9824 by Matthew Craven at 2025-03-06T18:11:59-05:00 Cmm: Add surface syntax for Word/Float bitcast ops - - - - - 25c4a2a2 by Matthew Craven at 2025-03-06T18:11:59-05:00 Cmm: Add constant-folding for Word->Float bitcasts - - - - - 30bdea67 by Matthew Craven at 2025-03-06T18:11:59-05:00 Add tests for #25771 - - - - - 44bf5fa1 by Matthew Pickering at 2025-03-07T13:48:18+00:00 iface: Store flags in interface files When reporting the reason why a module is recompiled (using `-dump-hi-diffs`), it is much more informative to inform the user about which flag exactly has changed, rather than just an opaque reference to a hash. Now, when the user enables `-fwrite-if-self-recomp-flags` there is a difference the precise part of the flags is reported: ``` codegen flags changed: before: [Opt_NoTypeableBinds, Opt_OmitYields] after: [Opt_NoTypeableBinds, Opt_OmitYields, Opt_DictsStrict] ``` Fixes #25571 - - - - - 324222bd by Oleg Grenrus at 2025-03-08T08:50:18-05:00 Run fix-whitespace on compiler/ https://hackage.haskell.org/package/fix-whitespace IMO this should be included into lint suite - - - - - 1e53277a by sheaf at 2025-03-08T16:32:25-05:00 Allow defaulting of representational equalities This commit generalises the defaulting of equality constraints that was introduced in 663daf8d (with follow-up in 6863503c) to allow the defaulting of *representational* equality constraints. Now we default a representational equality ty1 ~R# ty2 by unifying ty1 ~# ty2. This allows the following defaulting to take place: - Coercible alpha[tau] Int ==> alpha := Int - Coercible (IO beta[tau]) (IO Char) ==> beta := Char See Note [Defaulting representational equalities] in GHC.Tc.Solver.Default for more details. Fixes #21003 - - - - - d6c40afc by Andreas Klebinger at 2025-03-08T16:33:02-05:00 Revert "Use `Infinite` in unique generation, and clean up some other partial uni patterns as well." This reverts commit 643dd3d86968c527ba07ece9cc337728dbdfe2a0. As described in #25817 this commit introduced a subtle bug in AArch64 code generation. So for the time being I will simply revert it wholesale. - - - - - 68310e11 by Andreas Klebinger at 2025-03-08T16:33:39-05:00 Properly describe acceptance window for stat tests. The relative metric is already in %, so no need to multiply by 100. - - - - - cca68421 by Cheng Shao at 2025-03-08T22:04:42-05:00 wasm: do not use wasm type reflection in dyld The wasm dynamic linker used to depend on v8's experimental wasm type reflection support to generate stub functions when treating GOT.func items that aren't exported by any loaded library yet. However, as we work towards wasm ghci browser mode (#25399), we need to ensure the wasm dyld logic is portable across browsers. So this commit removes the usage of wasm type reflection in wasm dyld, and it shall only be added many months later when this feature is widely available in browsers. - - - - - 75fcc5c9 by Cheng Shao at 2025-03-08T22:05:19-05:00 wasm: don't create a wasm global for dyld poison There's a much more efficient way to convert an unsigned i32 to a signed one. Thanks, o3-mini-high. - - - - - fd40eaa1 by Cheng Shao at 2025-03-08T22:05:19-05:00 wasm: revamp JSFFI internal implementation and documentation This patch revamps the wasm backend's JSFFI internal implementation and documentation: - `JSValManager` logic to allocate a key is simplified to simple bumping. According to experiments with all major browsers, the internal `Map` would overflow the heap much earlier before we really exhaust the 32-bit key space, so there's no point in the extra complexity. - `freeJSVal` is now idempotent and safe to call more than once. This is achieved by attaching the `StablePtr#` to the `JSVal#` closure and nullifying it when calling `freeJSVal`, so the same stable pointer cannot be double freed. - `mkWeakJSVal` no longer exposes the internal `Weak#` pointer and always creates a new `Weak#` on the fly. Otherwise by finalizing that `Weak#`, user could accidentally drop the `JSVal`, but `mkWeakJSVal` is only supposed to create a `Weak` that observes the `JSVal`'s liveliness without actually interfering it. - `PromisePendingException` is no longer exported since it's never meant to be caught by user code; it's a severe bug if it's actually raised at runtime. - Everything exported by user-facing `GHC.Wasm.Prim` now has proper haddock documentation. - Note [JSVal representation for wasm] has been updated to reflect the new JSVal# memory layout. - - - - - cbae3708 by Ben Gamari at 2025-03-11T06:09:58-04:00 users guide: Fix typo - - - - - 1951eb7a by Ben Gamari at 2025-03-11T06:10:35-04:00 testsuite: Don't count fragile passes as failures in JUnit output As noted in #25806, the testsuite driver's JUnit output previously considered passes of fragile tests to be failures. Fix this. Closes #25806. - - - - - 589f40b9 by Matthew Pickering at 2025-03-11T06:11:11-04:00 Use panic rather than error in expectJust Otherwise, we would not get a callstack printed out when the exception occurs. Fixes #25829 - - - - - d450e88e by sheaf at 2025-03-11T06:42:59-04:00 Solve Wanted quantified constraints from Givens This commit ensures we directly solve Wanted quantified constraints from matching inert Given quantified constraints,instead of going through the trouble of emitting an implication constraint and processing that. This is not just an optimisation; it makes our lives easier when generating RULEs for specialisation. See Note [Solving Wanted QCs from Given QCs] for details Fixes #25758 - - - - - 48daaf53 by Ben Gamari at 2025-03-11T06:42:59-04:00 testsuite: Add testcase for #25577 - - - - - d2ffb0ce by Ben Gamari at 2025-03-11T06:42:59-04:00 testsuite/ghc-api: Eliminate Makefile usage from various GHC API tests These tests can be expressed perfectly well using the testsuite driver itself. - - - - - 2275b642 by Ben Gamari at 2025-03-11T06:42:59-04:00 rts/linker/MachO: Assert that GOT relocations have GOT entries In #25577 we found that some GOT relocation types were not being given relocation entries. Add assertions to catch this sort of failure in the future. - - - - - 8c96bcb4 by Ben Gamari at 2025-03-11T06:42:59-04:00 rts/linker/MachO: Account for internal GOT references in GOT construction Previously we failed to give GOT slots to symbols which were referred to by GOT relocations in the same module. This lead to #25577. Fix this by explicitly traversing relocation lists and maintaining a `needs_got` flag for each symbol. Fixes #25577. - - - - - 7b84c588 by Vladislav Zavialov at 2025-03-11T06:43:02-04:00 One list in ConPat (part of #25127) This patch changes PrefixCon to use one list instead of two: -data HsConDetails tyarg arg rec - = PrefixCon [tyarg] [arg] +data HsConDetails arg rec + = PrefixCon [arg] | RecCon rec | InfixCon arg arg The [tyarg] list is now gone. To understand the effect of this change, recall that there are three instantiations of HsConDetails: 1. type HsConPatDetails p = HsConDetails (HsConPatTyArg (NoGhcTc p)) -- tyarg (LPat p) -- arg (HsRecFields p (LPat p)) -- rec 2. type HsConDeclH98Details pass = HsConDetails Void -- tyarg (HsScaled pass (LBangType pass)) -- arg (XRec pass [LConDeclField pass]) -- rec 3. type HsPatSynDetails pass = HsConDetails Void -- tyarg (LIdP pass) -- arg [RecordPatSynField pass] -- rec In cases (2) and (3), tyarg was instantiated to Void, so the [tyarg] list was always empty. Its removal is basically a no-op. The interesting case is (1), which is used in ConPat to represent pattern matching of the form (MkE @tp1 @tp2 p1 p2). With this patch, its representation is changed as follows: ConPat "MkE" [tp1, tp2] [p1, p2] -- old ConPat "MkE" [InvisP tp1, InvisP tp2, p1, p2] -- new The new mixed-list representation is consintent with lambdas, where InvisP is already used to deal with \ @tp1 @tp2 p1 p2 -> body. The immediate effect of the new representation is an improvement to error messages. Consider the pattern (Con x @t y). Previously it resulted in a parse error because @t could not occur after x. Now it is reported as [GHC-14964]. Test case: TyAppPat_MisplacedApplication. In the long term, this is intended as preparation for #18389 and #25127, which would make (Con x @t y) potentially valid, e.g. if its type is Con :: forall a -> forall b. (a, b) -> T The TH AST is left unchanged for the moment to avoid breakage. - - - - - cce869ea by Vladislav Zavialov at 2025-03-11T06:43:02-04:00 Error message with EmptyCase and RequiredTypeArguments (#25004) Fix a panic triggered by a combination of \case{} and forall t -> ghci> let f :: forall (xs :: Type) -> (); f = \case {} panic! (the 'impossible' happened) GHC version 9.10.1: Util: only The new error message looks like this: ghci> let f :: forall (xs :: Type) -> (); f = \case {} <interactive>:5:41: error: [GHC-48010] • Empty list of alternatives in \case expression checked against a forall-type: forall xs -> ... This is achieved as follows: * A new data type, BadEmptyCaseReason, is now used to describe why an empty case has been rejected. Used in TcRnEmptyCase. * HsMatchContextRn is passed to tcMatches, so that the type checker can attach the syntactic context to the error message. * tcMatches now rejects type arguments if the list of alternatives is empty. This is what fixes the bug. - - - - - 37d8b50b by sheaf at 2025-03-11T06:43:06-04:00 user's guide: consolidate defaulting documentation This commit adds a new section on defaulting, which consolidates various parts of documentation surrounding defaulting into one central place. It explains type class defaulting in detail, extensions to it with OverloadedStrings, NamedDefaults and ExtendedDefaultRules, as well as other defaulting mechanisms (e.g. kind-based defaulting such as RuntimeRep defaulting, and defaulting of equalities). - - - - - 0c9fd8d4 by sheaf at 2025-03-11T06:43:06-04:00 user's guide: flesh out XOverloadedStrings docs This commit extends the documentation of the OverloadedStrings extension with some usage information, in particular suggestions to: - use default declarations, such as `default (Text)` or `default IsString(Text)` (with the NamedDefaults extension), - enable the ExtendedDefaultRules extension to relax the requirement that a defaultable type variable must only appear in unary standard classes Fixes #23388 - - - - - 2df171d4 by sheaf at 2025-03-11T06:43:06-04:00 user's guide: NamedDefaults vs ExtendedDefaultRules This commit clarifies the defaulting rules with NamedDefaults, in particular in situations where a type variable appears in other constraints than standard/unary constraints. - - - - - 77df05d0 by Matthew Pickering at 2025-03-11T06:43:07-04:00 Take into account all flags when computing iface_hash The "interface hash" should contain a hash of everything in the interface file. We are not doing that yet but at least a start is to include a hash of everything in `mi_self_recomp`, rather than just `mi_src_hash` and `mi_usages`. In particular, this fixes #25837, a bug where we should recompile a `dyn_hi` file but fail to do so. - - - - - 48b8f110 by Matthew Pickering at 2025-03-11T06:43:07-04:00 Pass -fPIC to dynamicToo001 test to avoid platform dependence issues On darwin platforms, `-fPIC` is always enabled but on linux it is only enabled in the dynamic flavour. This can cause a difference in interface files (see #25836). The purpose of this test isn't to test module A recompilation, so we avoid this platform dependency by always passing `-fPIC`. - - - - - 03c72f01 by Matthew Pickering at 2025-03-11T06:43:07-04:00 Remove mi_used_th field from interface files In the distant past, recompilation checking was disabled for interfaces which used TemplateHaskell, but for several years now recompilation checking has been more fine-grained. This has rendered this field unused and lingering in an interface file. - - - - - 6bb0e261 by Matthew Pickering at 2025-03-11T06:43:07-04:00 Remove mi_hpc field from interface files The `mi_hpc` field is not used for anything as far as I can discern so there is no reason to record in the private interface of a module that there are modules in the transitive closure which use `hpc`. You can freely mix modules which use `-fhpc` and ones which don't. Whether to recompile a module due to `-fhpc` being passed to the module itself is determined in `fingerprintDynFlags`. - - - - - b6d5b091 by Simon Peyton Jones at 2025-03-11T22:39:23-04:00 We can't UNPACK multi-constructor GADTs This MR fixes #25672 See Note [Unpacking GADTs and existentials] in GHC.Types.Id.Make - - - - - 8eae151d by Teo Camarasu at 2025-03-11T22:40:00-04:00 template-haskell: Add explicit exports lists to all remaining modules - - - - - db621b58 by Teo Camarasu at 2025-03-11T22:40:00-04:00 template-haskell: fix haddocks It seems that we need a direct dependency on ghc-internal, otherwise Haddock cannot find our haddocks The bug seems to be caused by Hadrian because if I rebuild with cabal-install (without this extra dependency) then I get accurate Haddocks. Resolves #25705 - - - - - 64ea68d9 by Ben Gamari at 2025-03-12T07:11:51-04:00 mk-ghcup-metadata: Clean up and add type annotations Getting this file right has historically been quite painful as it is a dynamically-typed script running only late in the release pipeline. - - - - - b3f80b07 by Ben Gamari at 2025-03-12T07:12:27-04:00 rts: Drop imports of pthreads functions in cmm sources These are no longer used. I noticed these while looking for uses of __PIC__ in Cmm sources. - - - - - 915a6781 by Matthew Pickering at 2025-03-13T01:46:41-04:00 interfaces: Ensure that forceModIface deeply forces a ModIface A ModIface is the result of compilation that we keep for a long time in memory. Therefore, it's very important to manage what we are going to retain and remove any external references to things which we might have captured compilation. If storing your ModIface in memory uses too much space, then store less things or make it use a more efficient representation. In the past there have been many space leak bugs by not sufficiently forcing a ModIface (#15111) This patch adds all the missing NFData instances for all the places I could find where we weren't deeply forcing the structure. - - - - - 24d373a6 by Matthew Craven at 2025-03-13T01:47:18-04:00 Add interface-stability test for ghc-prim - - - - - 0cb1db92 by sheaf at 2025-03-14T13:11:44-04:00 Don't report used duplicate record fields as unused This commit fixes the bug reported in #24035 in which the import of a duplicate record field could be erroneously reported as unused. The issue is that an import of the form "import M (fld)" can import several different 'Name's, and we should only report an error if ALL of those 'Name's are unused, not if ANY are. Note [Reporting unused imported duplicate record fields] in GHC.Rename.Names explains the solution to this problem. Fixes #24035 - - - - - f1830d74 by Matthew Pickering at 2025-03-14T13:12:21-04:00 binary: Directly copy ShortByteString to buffer rather than go via ByteString This avoids allocating an intermediate bytestring. I just noticed on a profile that `putFS` was allocating, and it seemed strange to me why since it should just copy the contents of the FastString into the already allocated buffer. It turned out we were going indirectly via a ByteString. Fixes #25861 - - - - - b15fca2b by Matthew Pickering at 2025-03-15T05:36:40-04:00 iface: Store logical parts of ModIface together The ModIface structure is divided into several logical parts: 1. mi_mod_info: Basic module metadata (name, version, etc.) 2. mi_public: The public interface of the module (the ABI), which includes: - Exports, declarations, fixities, warnings, annotations - Class and type family instances - Rewrite rules and COMPLETE pragmas - Safe Haskell and package trust information - ABI hashes for recompilation checking 4. mi_self_recomp: Information needed for self-recompilation checking (see Note [Self recompilation information in interface files]) 5. mi_simplified_core: Optional simplified Core for bytecode generation (only present when -fwrite-if-simplified-core is enabled) 6. mi_docs: Optional documentation (only present when -haddock is enabled) 7. mi_top_env: Information about the top-level environment of the original source 8. mi_ext_fields: Additional fields for extensibility This structure helps organize the interface data according to its purpose and usage patterns. Different parts of the compiler use different fields. By separating them logically in the interface we can arrange to only deserialize the fields that are needed. This patch also enforces the invariant that the fields of ModIface are lazy. If you are keeping a ModIface on disk, then force it using `forceModIface`. Otherwise, when the `ModIface` is read from disk, only the parts which are needed from the interface will be deserialised. In a follow-up patch I will tackle follow-up issues: * Recompilation checking doesn't take into account exported named defaults (#25855) * Recompilation checking does not take into account COMPLETE pragmas (#25854) * mi_deps_ field in an interface is confused about whether the information is for self-recompilation checking or part of the ABI (#25844) Fixes #25845 ------------------------- Metric Decrease: MultiLayerModulesDefsGhciWithCore ------------------------- - - - - - c758cb71 by Ben Gamari at 2025-03-15T05:37:17-04:00 configure: Fix incorrect SettingsLlvmAsFlags value Previously this was set to `LlvmAsCmd` rather than `LlvmAsFlags`, resulting in #25856. - - - - - cfaaca14 by sheaf at 2025-03-18T20:05:03-04:00 Fix buglet in isEmptyWorkList There was a missing case in GHC.Tc.Solver.InertSet.isEmptyWorkList; it mistakenly ignored the 'wl_rw_eqs' field. This commit simply fixes that. No test case. - - - - - 9f9fe0b3 by sheaf at 2025-03-18T20:05:03-04:00 Add mapMaybeTM method to TrieMap class This commit adds a new method to the TrieMap class, mapMaybeTM, and adds implementations to all the instances. mapMaybeTM is useful when filtering containers that contain other containers. - - - - - 393531ff by Simon Peyton Jones at 2025-03-18T20:05:03-04:00 Specialising expressions -- at last This MR addresses #24359, which implements the GHC proposal 493 on SPECIALISE pragmas. * The old code path (using SpecSig and SpecPrag) still exists. * The new code path (using SpecSigE and SpecPragE) runs alongside it. * All SPECIALISE pragmas are routed through the new code path, except if you give multiple type sigs, when the old code path is still used. * Main documentation: Note [Handling new-form SPECIALISE pragmas] in GHC.Tc.Gen.Sig` Thanks to @sheaf for helping with this MR. The Big Thing is to introduce {-# SPECIALISE forall x. f @Int x True #-} where you can give type arguments and value argument to specialise; and you can quantify them with forall, just as in Rules. I thought it was going to be pretty simple, but it was a Long, Long Saga. Highlights * Overview Note [Handling new-form SPECIALISE pragmas] in GHC.Tc.Gen.Sig - New data constructor `SpecSigE` in data type `L.H.S.Binds.Sig` - New data construtor `SpecPragE` in data type `GHC.Hs.Binds.TcSpecPrag` - Renamer: uses `checkSpecESigShape` to decide which function to assocate the SPECIALISE pragma with - Some of the action is in `GHC.Tc.Gen.Sig.tcSpecPrag` - The rest is in `GHC.HsToCore.Binds.dsSpec` * We use a new TcS mode, TcSFullySolve, when simplifying the Wanteds that arise from the specialise expression. The mechanism is explained in Note [TcSFullySolve] in GHC.Tc.Solver.Monad. The reason why we need to do this is explained in Note [Fully solving constraints for specialisation] in GHC.Tc.Gen.Sig. * All of GHC.Tc.Gen.Rule is moved into GHC.Tc.Gen.Sig, because the code is very closely related. * The forall'd binders for SPECIALISE are the same as those for a RULE, so I refactored, introducing data type `L.H.S.Binds.RuleBndrs`, with functions to rename, zonk, typecheck it. I refactored this data type a bit; nicer now. * On the LHS of RULES, or SPECIALISE, we want to disable the tricky mechanims described in Note [Desugaring non-canonical evidence] in GHC.HsToCore.Expr. Previously it wasn't fully disabled (just set to the empty set), and that didn't quite work in the new regime. * There are knock-on changes to Template Haskell. * For the LHS of a RULE and a SPECIALISE expression, I wanted to simplify it /without/ inlining the let-bindings for evidence variables. I added a flag `so_inline` to the SimpleOpt optimiser to support this. The entry point is `GHC.Core.SimpleOpt.simpleOptExprNoInline` * Since forever we have had a hack for type variables on the LHS of RULES. I took the opportunity to tidy this up. The main action is in the zonker. See GHC.Tc.Zonk.Type Note [Free tyvars on rule LHS], and especially data construtor `SkolemiseFlexi` in data type `GHC.Tc.Zonk.Env.ZonkFlexi` * Move `scopedSort` from GHC.Core.TyCo.FVs to GHC.Core.Predicate Reason: it now works for Ids as well, and I wanted to use isEvVar, which is defined in GHC.Core.Predicate Avoiding module loops meant that instead of exporting GHC.Core.TyCo.Tidy from GHC.Core.Type, modules now import the former directly. I also took the opportunity to remove unused exports from GHC.Core.Type.hs-boot * Flag stuff: - Add flag `-Wdeprecated-pragmas` and use it to control the warning when using old-style SPECIALISE pragmas with multiple type ascriptions, - Add flag `-Wuseless-specialisations` and use it to control the warning emitted when GHC determines that a SPECIALISE pragma would have no effect. Don't want if the SPECIALISE is SPECIALISE INLINE (#4444) In response to #25389, we continue to generate these seemingly code for these seemingly useless SPECIALISE pragmas - Adds deprecations to Template Haskell `pragSpecD` and `pracSpecInlD`, * Split up old-style SPECIALISE pragmas in GHC.Internal.Float, GHC.Internal.Numeric, GHC.Internal.Real * Remove useless SPECIALISE pragmas in Data.Array (updating the array submodule) Smaller things: - Update the Users Guide - Add mention of the changes to the 9.14 release notes as well as the Template Haskell changelog, - - - - - 1884dd1a by Simon Peyton Jones at 2025-03-18T20:05:03-04:00 Add -Wrule-lhs-equalities warning This commit adds a new warning, controlled by the warning flag, -Wrule-lhs-equalities, which is emitted when the LHS of a RULE gives rise to equality constraints that previous GHC versions would have quantified over. GHC instead discards such RULES, as GHC was never able to generate a rule template that would ever fire; it's better to be explicit about the fact that the RULE doesn't work. - - - - - b00b3ef0 by Ben Gamari at 2025-03-18T20:05:41-04:00 compiler: Add export list to GHC.SysTools.Process This also revealed that `readProcessEnvWithExitCode` and its local helpers were dead code. - - - - - 25850b22 by ARATA Mizuki at 2025-03-18T20:06:25-04:00 Fix code generation for SSE vector operations The new implementation generates correct code even if the registers overlap. Closes #25859 - - - - - e576468c by Andreas Klebinger at 2025-03-18T20:07:02-04:00 Bump nofib submodule. Fixes #25867. (Ben-raytrace being broken by library changes) - - - - - 443fc8b1 by Sjoerd Visscher at 2025-03-19T12:01:04-04:00 Multiplicity annotation on records Needing to store multiplicity annotations on records triggered a refactoring of AST of data declarations: Moved HsBangTy and HsRecTy from HsType to HsTypeGhcPsExt, the extension of HsType during parsing, since they are only needed during parsing. New HsConDeclField that stores all source data shared by all constructor declaration fields: unpackedness, strictness, multiplicity, documentation and the type of the field. Merged HsMultAnn and HsArrowOf, so all multiplicity annotations share the same data type. HsBang was no longer needed as a separate type, and was inlined into HsSrcBang. - - - - - 313cf271 by Ben Gamari at 2025-03-19T12:01:43-04:00 gitlab-ci: Drop CentOS 7 binary distributions CentOS 7 is EoL and moreover we cannot even build images for it. See #25061. - - - - - 5b94f99f by Ben Gamari at 2025-03-19T12:02:21-04:00 rts: Ensure that WinIO flag is set when --io-manager=auto As noted in #25838, previously `selectIOManager` failed to set `rts_IOManagerIsWin32Native` in its `IO_MNGR_FLAG_AUTO`. This meant that the MIO path was taken when WinIO was supposedly selected, resulting in chaos. Fixes #25838. - - - - - 1a3f1131 by Peng Fan at 2025-03-19T12:03:10-04:00 Pass the mcmodel=medium parameter to CC via GHC Ensure that GHC-driver builds default to mcmodel=medium, so that GHC passes this default parameter to CC without having to add it to the compiled project. Commit e70d41406b5d5638b42c4d8222cd03e76bbfeb86 does not ensure that all GHC-built object files have a default model of medium, and will raise an R_LARCH_B26 overflow error. - - - - - 27cf7361 by Matthew Craven at 2025-03-19T12:03:48-04:00 Add interface-stability test for ghc-bignum As with ghc-prim, it makes sense to have some protection against accidental interface changes to this package caused by changes in ghc-internal. - - - - - 25d46547 by Matthew Craven at 2025-03-19T12:03:48-04:00 Add README reference for the interface-stability tests - - - - - 5d65393e by Simon Peyton Jones at 2025-03-20T05:41:24-04:00 Remove the Core flattener This big MR entirely removes the "flattener" that took a type and replaced each type-family application with a fresh type variable. The flattener had its origin in the paper Injective type families for Haskell But (a) #25657 showed that flattening doesn't really work. (b) since we wrote the paper we have introduced the so-called "fine-grained" unifier GHC.Core.Unify, which can return * SurelyApart * Unifiable subst * MaybeApart subst where the MaybeApart says that the two types are not unifiable by a substitution, but could (perhaps) be unified "later" after some type family reductions. This turns out to subsume flattening. This MR does a major refactor of GHC.Core.Unify to make it capable of subsuming flattening. The main payload is described in Note [Apartness and type families] and its many wrinkles. The key (non-refactoring) implementation change is to add `um_fam_env` to the `UMState` in the unification monad. Careful review with Richard revealed various bugs in the treament of `kco`, the kind coercion carried around by the unifier, so that is substantially fixed too: see Note [Kind coercions in Unify]. Compile-time performance is improved by 0.1% with a few improvements over 1% and one worsening by 1.3% namely T9872a. (I have not investigated the latter.) Metric Decrease: T9872b T9872c TcPlugin_RewritePerf Metric Increase: T9872a - - - - - 9003ef0a by sheaf at 2025-03-20T05:42:08-04:00 Remove SDoc from UnknownSubordinate/MissingBinding This commit replaces unstructured SDoc arguments in error message constructors with uses of the following two datatypes: - SigLike: for different kinds of signatures (e.g. standalone kind signatures, fixity signatures, COMPLETE pragmas, etc) - Subordinate: for class methods, associated types, and record fields The following error message constructors now no longer have any SDocs in them: - TcRnIllegalBuiltinSyntax: SDoc -> SigLike - MissingBinding: SDoc -> SigLike - UnknownSubordinate: SDoc -> (Name, Subordinate) - SuggestMoveToDeclarationSite: SDoc -> SigLike - - - - - 4329f3b6 by sheaf at 2025-03-20T05:42:08-04:00 Remove SDocs from HsDocContext This commit removes the remaining SDocs from the HsDocContext data type. It adds the following constructors: ClassInstanceCtx -- Class instances ClassMethodSigCtx -- Class method signatures SpecialiseSigCtx -- SPECIALISE pragmas PatSynSigCtx -- Pattern synonym signatures We now report a bit more information for errors while renaming class instances, which slightly improves renamer-emitted error messages. - - - - - 75c29aa1 by sheaf at 2025-03-20T05:42:08-04:00 Reject instance with non-class head in renamer This commit modifies rnClsInstDecl so that, when renaming, we reject a class instance declaration in which the head is not a class. Before this change, it would get rejected in the type-checker, but that meant that the renamer could emit unhelpful error messages, e.g.: data Foo m a instance Foo m where fmap _ x = case x of would rather unhelpfully say: ‘fmap’ is not a (visible) method of class ‘Foo’ when of course 'Foo' is not even a class. We now reject the above program with the following error message: Illegal instance for data type ‘Foo’. Instance heads must be of the form C ty_1 ... ty_n where ‘C’ is a class. Fixes #22688 - - - - - a8f543a9 by Cheng Shao at 2025-03-20T18:47:19-04:00 testsuite: mark T7919 as fragile on i386 as well T7919 may also fail i386 CI jobs with test timeout. - - - - - 256ac29c by sheaf at 2025-03-20T18:48:07-04:00 Don't cache solved [W] HasCallStack constraints This commit ensures we do not add solved Wanted constraints that mention HasCallStack or HasExceptionContext constraints to the set of solved Wanted dictionary constraints: caching them is invalid, because re-using such cached dictionaries means using an old call-stack instead of constructing a new one, as was reported in #25529. Fixes #25529. - - - - - 47646ce2 by Andrew Lelechenko at 2025-03-20T18:48:43-04:00 Improve haddock-visible documentation for GHC.Driver.Flags - - - - - 2e4e15ed by Sylvain Henry at 2025-03-21T17:49:36-04:00 Document -fnum-constant-folding (#25862) - - - - - 044a6e08 by sheaf at 2025-03-21T17:50:24-04:00 LLVM: fix typo in padLiveArgs This commit fixes a serious bug in the padLiveArgs function, which was incorrectly computing too many padding registers. This caused segfaults, e.g. in the UnboxedTuples test. Fixes #25770 Fixes #25773 - - - - - 1745c749 by Teo Camarasu at 2025-03-22T18:42:37-04:00 template-haskell: remove Language.Haskell.TH.Lib.Internal This module is purely used for the implementation of TH quote desugarring. Historically this needed to be exposed from `template-haskell`, since that's the package that the desugarred expressions referenced but since https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12479, this is no longer the case. Now these identifiers are in `ghc-internal`. Note that this module has carried the following warning for a long time: > This is not a part of the public API, and as such, there are no API guarantees for this module from version to version. Resolves #24766 - - - - - 3bc507db by Alan Zimmerman at 2025-03-22T18:43:13-04:00 EPA: Fix exact printing of SPECIALISE pragma This commit fixes two minor issues with exactprinting of the SPECIALISE pragma after !12319 landed - The span for the RHS did not include the optional signature type - The `::` was printed twice when the legacy path was used Closes #25885 - - - - - bdf93da8 by sheaf at 2025-03-24T11:25:12+01:00 Renamer: improve handling of export children This commit refactors the 'childGREPriority' function which is used when renaming subordinate items in export lists and class declarations. Instead of having a complicated LookupChild parameter, we now simply pass the GREInfo of the parent, which allows us to decide what is a valid child: - classes can have children that are in the type constructor namespace, - promoted data constructors should be treated the same as normal data constructors. Fixes #24027 - - - - - 1dbc7846 by Matthew Pickering at 2025-03-24T15:35:17-04:00 Revert "mk-ghcup-metadata: Clean up and add type annotations" This reverts commit 64ea68d9a206ec4db5020b0a3fc563199ab18be3. See #25889 - - - - - 6941c825 by doyougnu at 2025-03-25T10:05:58-04:00 base: construct compat RTSFlags -- see CLC #289 - - - - - 730e6f77 by doyougnu at 2025-03-25T10:06:02-04:00 base: construct compat GHC.Stats -- see CLC #289 - - - - - cd9e6605 by Ben Gamari at 2025-03-25T17:59:52-04:00 rel_eng/upload: Clarify usage directions Previously it was not made clear that the directory name is significant. - - - - - 7d18c19b by Cheng Shao at 2025-03-25T22:00:56+00:00 ghci: make the Pipe type opaque This commit makes the Pipe type in ghci opaque, and introduce the mkPipeFromHandles constructor for creating a Pipe from a pair of Handles. Pipe is now just a pair of receiver/sender continuations under the hood. This allows a Pipe to be potentially backed by other IPC mechanisms (e.g. WebSockets) which is essential for wasm ghci browser mode. - - - - - a2103fd2 by Cheng Shao at 2025-03-25T22:00:56+00:00 ghci: use improved Pipe logic for wasm iserv This commit makes wasm iserv take advantage of the Pipe refactoring by passing binary receiver/sender js callbacks from the dyld script. This paves the way for piping the binary messages through WebSockets in order to run wasm iserv in the browser, but more importantly, it allows us to get rid of a horrible hack in the dyld script: we no longer have to fake magical wasi file descriptors that are backed by nodejs blocking I/O! The legacy hack was due to these facts: - iserv only supported exchanging binary messages via handles backed by file descriptors - In wasi you can't access host file descriptors passed by host ghc - The nodejs wasi implementation only allows mapping host directories into the wasi vfs, not host file descriptors - Named pipes with file paths (mkfifo) doesn't work well with nodejs wasi implementation, causes spurious testsuite failures on macos But starting from this point, we can fully take advantage of non-blocking I/O on the js side. - - - - - fa2fbd2b by Cheng Shao at 2025-03-25T22:00:56+00:00 ghci: fix ^C handling for wasm iserv This commit fixes ^C handling for wasm iserv. Previously we didn't handle it at all, so ^C would kill the node process and host ghc would then crash as well. But native ghc with external interpreter can handle ^C just fine and wasm should be no different. Hence the fix: wasm iserv exports its signal handler as a js callback to be handled by the dyld script. Also see added note for details. - - - - - efcebed6 by Cheng Shao at 2025-03-25T22:00:56+00:00 wasm: fix post-link.mjs for browser The wasm ghci browser mode needs to run dyld.mjs in the browser which imports post-link.mjs. This script makes post-link.mjs runnable in the browser by deferring node-specific module imports to their actual use sites. - - - - - 27bb73c6 by Cheng Shao at 2025-03-25T22:00:56+00:00 wasm: use console.assert in dyld script This commit uses console.assert() instead of node-specific strict assert in the dyld script, in order to make it runnable in the browser. console.assert() only warns and doesn't crash upon assertion failure, but this is fine; we can always trivially define a strict assert function shall it be necessary when debugging, and there hasn't been such an assertion failure seen in the wild for long enough. - - - - - 929df0ba by Cheng Shao at 2025-03-25T22:00:56+00:00 wasm: asyncify the dylink.0 custom section parser This commit refactors the simple binary parser in the dyld script in charge of parsing the dylink.0 custom section. Previously the parser was synchronous and operated on the entire input buffer; this was simple and easy and worked well enough when the input wasm modules are instantly read from local filesystem. However, when running dyld in the browser, the wasm modules are transferred via fetch() requests. The host ghc and the browser might not be on the same machine, so slow network uplink does need to be considered. We only need to parse dylink.0 custom section to extract dependency info, and dylink.0 is the very first custom section in the wasm shared library binary payload, so the parsing process should not require fetch() to complete and should return the parsing result asap. Hence the refactorings in this commit: asyncify the parser, make it only consume as many bytes as needed by invoking an async consumer callback. The input is a readable stream from the fetch() response; once the response is available, the async wasm compilation can start in the background, and dylink.0 parsing shall end asap which results in more wasm shared libraries to be loaded earlier. Profit. - - - - - 9a697181 by Cheng Shao at 2025-03-25T22:00:56+00:00 wasm: fix dyld setImmediate usage in browser The wasm dyld script used to only run in node and directly uses setImmediate in globalThis. In case of browsers, it needs to import setImmediate from the prelude, hence this commit. - - - - - d9b71e82 by Cheng Shao at 2025-03-25T22:00:57+00:00 wasm: fix dyld downsweep filepath handling in browser The wasm dyld downsweep logic used to rely on nodejs path module to handle filepaths. That's not available in browsers, so this commit implements poor man's filepath handling in js, which is not elegant for sure but works for both nodejs and the browser. - - - - - 7003a399 by Cheng Shao at 2025-03-25T22:00:57+00:00 wasm: isolate nodejs-specific logic with the isNode flag in dyld As we move towards supporting running the dyld script in the browser, this commit implements the isNode module-level binding which is true if dyld is running in nodejs. The nodejs-specific bits are gated under isNode. For the browser case, this commit introduces @bjorn3/browser_wasi_shim as the wasi implementation; we already use it in quite a few projects and it simply works. - - - - - 22ba2a78 by Cheng Shao at 2025-03-25T22:00:57+00:00 wasm: isolate dyld side effects that might require IPC This commit spins out a DyLDHost class from DyLD that handles side effects that must be run in the same host environment that runs wasm32-wasi-ghc. When the dyld script runs in the browser, it'll need to do IPC to find libraries, fetch wasm library, etc, and the other side of dyld that runs on nodejs would simply expose the DyLDHost methods as endpoints for WebSockets/HTTP. - - - - - e93fc33d by Cheng Shao at 2025-03-25T22:00:57+00:00 wasm: implement wasm ghci browser mode This commit implements the rest of dyld logic that delivers the ghci browser mode: - The dyld script can now fully run in the browser. It communicates back with dyld-on-nodejs via WebSockets and also plain HTTP 1.1 requests. - The host dyld starts a server and acts as a broker between the GHC process and the browser side. GHC doesn't need to know anything about the browser mode; no driver flags need to be added and no recompilation needs to happen, the GHC driver continues to use the original iserv binary messages protocol. - The dyld broker doesn't need to parse any message between the browser dyld and GHC; it merely sets up WebSockets connections to redirect these messages as well as ^C signals. - Plain HTTP 1.1 is used for IPC requests (e.g. downloading a wasm module). - The dyld broker serves a main.js script that bootstraps iserv in the browser, and a main.html empty page playground for testing. CORS is enabled so it could be possible to inject iserv into other websites and use ghci to play with them. - All the RPC logic is opaque to the DyLD class, the majority of the wasm dynamic linker code is already portable and runs fine in firefox/chrome/webkit. Closes #25399. - - - - - fc576798 by Cheng Shao at 2025-03-25T22:00:57+00:00 wasm: add puppeteer/playwright support for ghci browser mode This commit adds support for using puppeteer/playwright for automatically launching a headless browser that backs the ghci browser mode. This is useful for testing the ghci browser mode as a part of GHC testsuite, and it's also convenient for local development since the step to start iserv can be automated away. - - - - - ad7e271d by Cheng Shao at 2025-03-25T22:00:57+00:00 wasm: support wasi console redirect for the ghci browser mode This commit adds optional support for redirecting wasi console stdout/stderr back to the host when running wasm ghci browser mode. By default, the wasi console outputs are only available under F12 devtools console, but in case of testing against a mobile browser, the devtools console may not be readily available, and it would be more convenient to at least get wasi console output on the host side. The redirection logic is simple, just adding another two WebSockets connections that pump the line-buffered textual messages back to host. - - - - - 731217ce by Cheng Shao at 2025-03-25T22:00:57+00:00 wasm: add brotli compression for ghci browser mode This commit adds brotli compression for wasm shared libraries for ghci browser mode. With BROTLI_MIN_QUALITY, the overhead is negligible, and it helps reducing amount of transferred data when the browser connects to the server over a slow connection. - - - - - ac70e643 by Cheng Shao at 2025-03-26T13:37:19+00:00 testsuite: add browser001 test for wasm ghci browser mode This commit adds support for testing the wasm ghci browser mode in the testsuite, as well as a simple first test case browser001 that makes use of TH, JSFFI and browser-specific DOM API. See added note and comments for details. - - - - - 6ef5c0d2 by Cheng Shao at 2025-03-26T13:37:24+00:00 docs: add wasm ghci subsection in user manual This commit updates the user manual to add wasm ghci subsection. - - - - - 37381bcf by Cheng Shao at 2025-03-26T13:37:24+00:00 docs: update Note [The Wasm Dynamic Linker] This commit updates Note [The Wasm Dynamic Linker] to reflect recent developments, in particular the wasm ghci browser mode. - - - - - 4b5a0f61 by Cheng Shao at 2025-03-26T13:37:24+00:00 ci: bump DOCKER_REV and test wasm ghci browser mode This commit bumps the ci-images revision for updated wasm toolchain, and adds the launch options required to test wasm ghci browser mode. - - - - - c6a3bc8f by Cheng Shao at 2025-03-26T13:37:24+00:00 driver: implement wasm ghci browser mode flags This commit implements GHC driver flags that enable the wasm ghci browser mode. - - - - - f75e823e by Cheng Shao at 2025-03-26T18:01:54-04:00 rts: add hs_try_putmvar_with_value to RTS API This commit adds hs_try_putmvar_with_value to rts. It allows more flexibility than hs_try_putmvar by taking an additional value argument as a closure to be put into the MVar. This function is used & tested by the wasm backend runtime, though it makes sense to expose it as a public facing RTS API function as well. - - - - - 9cd9f347 by Cheng Shao at 2025-03-26T18:01:54-04:00 wasm: use MVar as JSFFI import blocking mechanism Previously, when blocking on a JSFFI import, we push a custom stg_jsffi_block stack frame and arrange the `promise.then` callback to write to that stack frame. It turns out we can simply use the good old MVar to implement the blocking logic, with a few benefits: - Less maintenance burden. We can drop the stg_jsffi_block related Cmm code without loss of functionality. - It interacts better with existing async exception mechanism. throwTo would properly block the caller if the target thread is masking async exceptions. - - - - - da34f0aa by Cheng Shao at 2025-03-26T18:01:54-04:00 wasm: properly pin the raiseJSException closure We used to use keepAlive# to pin the raiseJSException closure when blocking on a JSFFI import thunk, since it can potentially be used by RTS. But raiseJSException may be used in other places as well (e.g. the promise.throwTo logic), and it's better to simply unconditionally pin it in the JSFFI initialization logic. - - - - - dc904bfd by Cheng Shao at 2025-03-26T18:01:54-04:00 wasm: implement promise.throwTo() for async JSFFI exports This commit implements promise.throwTo() for wasm backend JSFFI exports. This allows the JavaScript side to interrupt Haskell computation by raising an async exception. See subsequent docs/test commits for more details. - - - - - 7f80455e by Cheng Shao at 2025-03-26T18:01:55-04:00 testsuite: add test for wasm promise.throwTo() logic This commit adds a test case to test the wasm backend promise.throwTo() logic. - - - - - afdd3fe7 by Cheng Shao at 2025-03-26T18:01:55-04:00 docs: document the wasm backend promise.throwTo() feature - - - - - 65dc65dc by sheaf at 2025-03-26T18:02:43-04:00 Refactor CtEvidence into Given/Wanted This commit is a simple refactoring which splits up the CtEvidence, giving each constructor its own datatype: data CtEvidence = CtGiven GivenCtEvidence | CtWanted WantedCtEvidence data GivenCtEvidence = GivenCt { ctev_pred :: TcPredType , ctev_evar :: EvVar , ctev_loc :: CtLoc } data WantedCtEvidence = WantedCt { ctev_pred :: TcPredType , ctev_dest :: TcEvDest , ctev_loc :: CtLoc , ctev_rewriters :: RewriterSet } This enables a few minor simplifications in the code, notably removing a panic from GHC.Tc.Solver.Solve.solveWantedForAll_implic. Fixes #25848 - - - - - ada04031 by sheaf at 2025-03-26T18:03:27-04:00 Export lists: same prio for NoParent & RightParent This commit ensures that, when we are renaming children in an export list item such as module M ( P(A,B,C) ) we consider children with NoParent to have the same priority as children which have the correct parent (P in this case). This is because we should **not** prioritise a data constructor (with the right parent) over a pattern synonym we are bundling (which, before bundling, has no parent). Fixes #25892 - - - - - 721628a0 by Adriaan Leijnse at 2025-03-27T09:10:10-04:00 TTG: Replace HsUnboundVar with HsHole Context: The HsUnboundVar constructor in Language.Haskell.Syntax.Expr contained a RdrName, which stood in the way of the work towards a dedicated haskell-syntax library. The constructor was overloaded for unbound variables, anonymous and named holes, and parse errors. This commit: Replaces HsUnboundVar with HsHole. In the surface syntax HsHole only represents an anonymous expression hole ("_"). It is extended with the XHole type family. In the concrete GHC implementation of the language on the other hand, HsHole is used for "any thing which is not necessarily a valid or fully defined program fragment, but for which a type can be derived". This use is similar to how HsUnboundVar was used, but the parse error case is now made explicit with a ParseError case for XHole. This is in anticipation of future work on a fault tolerant compilation pipeline. - - - - - dbd852f5 by Ben Gamari at 2025-03-27T09:10:48-04:00 rel_eng: Finish removal of CentOS jobs Remove centos7 from release fetch and ghcup metadata generation scripts. Closes #25893. - - - - - 0e0231e7 by Matthew Pickering at 2025-03-28T18:36:33-04:00 hadrian: Make hash_unit_ids into a flavour transformer (and enable for release flavour) The primary reason for this change is to make the `release` flavour enable `--hash-unit-ids` by default without any further user intervention. * Packagers don't have to be aware of this special flag they should be using. * release builds on CI are uniformly testing with hashes (see !13418) Fixes #25379 - - - - - 9fc54c12 by Rodrigo Mesquita at 2025-03-28T18:37:10-04:00 driver: Move DynFlags consistency fixes off Main These consistency fixes found in Main.hs are required for the proper functioning of the compiler and should live together with all remaining fixes in `makeDynFlagsConsistent`. This is especially relevant to GHC applications that shouldn't have to copy/fix themselves possibly inconsistent DynFlags. Additionally, outputs information when verbosity is high about these consistency fixes that were previously quiet, adds information to the Note on consistency of DynFlags, and improves one of the fixes that incorrectly used `dynNow`. - - - - - 2fdd0be9 by sheaf at 2025-03-28T18:37:53-04:00 Remove GhcHint from TcRnNotInScope constructor This is a tiny refactoring which: - removes GhcHint/ImportError fields from some constructors of TcRnMessage, using the TcRnMessageDetailed mechanism instead to report this informaiton: - removes the GhcHint and ImportErrors fields from TcRnNotInScope - removes the GhcHint field from TcRnTermNameInType - ensures that we only include these hints and import errors when the -fhelpful-errors flag is turned on Fixes #25874 - - - - - 9e5cd064 by ARATA Mizuki at 2025-03-31T14:53:34-04:00 Better support for SSE3 and SSE4.1 In particular: * Pass appropriate attributes to LLVM * Define preprocessor macros for them - - - - - c2c7dd51 by ARATA Mizuki at 2025-03-31T14:53:34-04:00 x86: Add support for SSSE3 This commit adds the `-mssse3` flag, which controls usage of SSSE3 instructions in x86 code generation. - - - - - d7c62580 by ARATA Mizuki at 2025-03-31T14:53:34-04:00 x86 NCG SIMD: Implement 128-bit integer vector arithmetics This commit implements the following operations on integer vectors: * negateIntNXM# * plus{Int,Word}NXM# * minus{Int,Word}NXM# * times{Int,Word}NXM# * quot{Int,Word}NXM# * rem{Int,Word}NXM# * min{Int,Word}NXM# * max{Int,Word}NXM# where (N,M) is one of (8,16), (16,8), (32,4), or (64,2). Closes #25643 - - - - - f5ea4e7e by ARATA Mizuki at 2025-03-31T14:53:34-04:00 x86 NCG SIMD: Implement 128-bit integer vector shuffle This commit implements the following operations: * shuffle{Int,Word}8X16# * shuffle{Int,Word}16X8# * shuffle{Int,Word}32X4# * shuffle{Int,Word}64X2# See #25643 - - - - - 5eeb6645 by Simon Peyton Jones at 2025-03-31T14:54:16-04:00 Re-jig the way that the Simplifier tries RULES As #25170 showed, if a new RULE appears, it could change the simplifier's behaviour a bit, even if it never fires; and that messes up deterministic compilation. (This was particularly nasty if the rule wasn't even transitively below the module being compiled.) This MR rejigs the use of `tryRules` so that behaviour does not change when a new, unrelated RULE is added. It's described in * Note [When to apply rewrite rules] * Note [tryRules: plan (BEFORE)] * Note [tryRules: plan (AFTER)] The main change is in the refactored version of * simplOutId * rebuildCall The little state machine that was embedded in ArgInfo is gone. As I wandered around the Simplifier I also found opportunities for some loosely-related refactoring: * In several places, the /substitution/ in the SimpleEnv is empty; all we care about is the in-scope set and the flags. So - I made a synonym `SimplEnvIS` that embodies that invariant, - used it in a number of type signatures (notably `rebuild`) - added some assertion checks (via `checkSimlEnvIS`) * I moved the hanlding of `runRW` out of `rebuildCall` (where we would have to test repeatedly) and into the new `simplOutId`, which fires up `rebuildCall`. Now it is only tested once. ------------------------- Metric Decrease: T9020 T9961 ------------------------- - - - - - f534474a by sheaf at 2025-03-31T14:54:59-04:00 Add comment: no qualified Names in the LocalRdrEnv This commit adds a reference to section 5.5.1 of the Haskell 2010 report, to explain that qualified names can't occur in the LocalRdrEnv. Fixes #25875 - - - - - d5ea80c6 by Patrick at 2025-03-31T14:55:42-04:00 Fix deadlock/loop in interface rehydration (#25858) In #25858, GHC hangs when processing modules with class defaults due to a circular dependency in the interface rehydration process. The deadlock/loop occurred when eager class defaults rehydration accessed not-yet-complete module details. To fix the immediate deadlock/loop. `tcIfaceDefaults` is refactored, we use the class name directly from the iface and use `forM` for lazy loading the class, which algins with the handling of other fields of ModDetails. This laziness ensure rehydration waits for HomePackageTable (HPT) to be updated and prevent premature evaluation of ModDetails inside `fixIO``. As suggested by Matthew, class defaults importing is also refactored to align with the compiler's established interface loading conventions. - add class defaults field to ExternalPackageState (EPS). - rehydrate and store class defaults in EPS at `loadInterface`. - Instead of using `tcIfaceDefaults` in `tcRnImports`, we add and use `tcGetClsDefaults` to read defaults directly from HPT or EPS when importing modules. Tests: - T25858, T25858v1-2: Test class hydration in defaults - T25858v3-4: Test type list hydration in defaults New Note [Tricky rehydrating IfaceDefaults loop] is added. Thanks to @sheaf (Sam), @mpickering (Matthew), and @simonpj (Simon) for their valuable input and analysis. Fixes #25858. - - - - - 2d419d8d by Matthew Pickering at 2025-04-02T16:12:36-04:00 Use unsafePerformIO in definition of computeFingerprint computeFingerprint is morally a pure function, which is implemented by mutating a buffer. Using unsafePerformIO inside the definition allows it to be used in pure contexts, fixing one place where an ad-hoc call to unsafePerformIO is already needed. - - - - - ccdf979b by Matthew Pickering at 2025-04-02T16:12:37-04:00 driver: Fix recompilation checking for exported defaults Since the exported defaults are not associated with any identifier from the module, they are just added to the export hash rather than the fine-grained recompilation logic. Fixes #25855 - - - - - c5bf9892 by Matthew Pickering at 2025-04-02T16:12:37-04:00 driver: Fix recompilation checking for COMPLETE pragmas A {-# COMPLETE P, Q #-} pragma is associated with the pattern synonyms P and Q during recompilation checking. Therefore, the existence of a pattern synonym becomes part of the ABI hash for P and Q. Then if a module uses these pattern synonyms and a complete pragma changes, it will trigger recompilation in that module. Fixes #25854 - - - - - d0fd9370 by sheaf at 2025-04-02T16:14:05-04:00 Handle named default exports separately This commit changes the way we check for duplicate exports of named default declarations. They are now treated entirely separately from other exports, because in an export list of the form module M ( default Cls, Cls ) the default declaration does not export the class 'Cls', but only its default declarations. Also fixes a bug in Backpack where named default exports were getting dropped entirely. No test for that. Fixes #25857 - - - - - 62d04494 by Cheng Shao at 2025-04-03T05:56:17-04:00 ci: add x86_64-linux-ubuntu24_04 nightly/release jobs - - - - - 327952e4 by Cheng Shao at 2025-04-03T05:56:17-04:00 rel-eng: add ubuntu24_04 bindists to ghcup metadata and fetch gitlab scripts - - - - - aa1e3b8b by sheaf at 2025-04-03T05:57:24-04:00 GHC settings: always unescape escaped spaces In #25204, it was noted that GHC didn't properly deal with having spaces in its executable path, as it would compute an invalid path for the C compiler. The original fix in 31bf85ee49fe2ca0b17eaee0774e395f017a9373 used a trick: escape spaces before splitting up flags into a list. This fixed the behaviour with extra flags (e.g. -I), but forgot to also unescape for non-flags, e.g. for an executable path (such as the C compiler). This commit rectifies this oversight by consistently unescaping the spaces that were introduced in order to split up argument lists. Fixes #25204 - - - - - 34a9b55d by lazyLambda at 2025-04-04T06:22:26-04:00 Driver: make MonadComprehensions imply ParallelListComp This commit changes GHC.Driver.Flags.impliedXFlags to make the MonadComprehensions extension enable the ParallelListComp extension. Fixes #25645 - - - - - d99eb7cd by sheaf at 2025-04-04T06:23:28-04:00 NamedDefaults: handle poly-kinded unary classes With this commit, we accept named default declarations for poly-kinded classes such as Typeable, e.g. default Typeable (Char) This used to fail because we assumed the kind of the class was monomorphic, e.g. Type -> Constraint (Type -> Type) -> Constraint Nat -> Constraint Now, we can handle a simple polymorphic class such as Typeable :: forall k. k -> Constraint Note that we keep the restriction that the class must only have one visible argument. This is all explained in the new Note [Instance check for default declarations] in GHC.Tc.Gen.Default. Fixes #25882 - - - - - 4cbc90de by sheaf at 2025-04-04T11:39:05-04:00 LLVM: add type annotations to AtomicFetch_cmm.cmm - - - - - e2237305 by sheaf at 2025-04-04T11:39:05-04:00 Cmm lint: lint argument types of CallishMachOps This commit adds a new check to Cmm lint to ensure that the argument types to a CallishMachOp are correct. The lack of this check was detected in the AtomicFetch test: the literals being passed as the second arguments to operations such as 'fetch_add', 'fetch_and'... were of the wrong width, which tripped up the LLVM backend. - - - - - 9363e547 by Cheng Shao at 2025-04-04T11:39:50-04:00 ci: add ghc-wasm-meta integration testing jobs This patch adds ghc-wasm-meta integration testing jobs to the CI pipeline, which are only triggered via the `test-wasm` MR label or manually when the `wasm` label is set. These jobs will fetch the wasm bindists and test them against a variety of downstream projects, similarly to head.hackage jobs for native bindists, offering a convenient way to catch potential downstream breakage while refactoring the wasm backend. - - - - - 27029e60 by Adam Gundry at 2025-04-04T11:40:36-04:00 base: Minor fixes to GHC.Records haddocks This corrects a stale reference to OverloadedRecordFields (which should be OverloadedRecordDot), fixes the haddock link syntax and adds an @since pragma. - - - - - f827c4c6 by Rodrigo Mesquita at 2025-04-07T11:22:10-04:00 Parametrize default logger action with Handles Introduce `defaultLogActionWithHandles` to allow GHC applications to use GHC's formatting but using custom handles. `defaultLogAction` is then trivially reimplemented as ``` defaultLogActionWithHandles stdout stderr ``` - - - - - 5dade5fd by sheaf at 2025-04-07T11:23:02-04:00 Finer-grained recompilation checking for exports This commit refines the recompilation checking logic, to avoid recompiling modules with an explicit import list when the modules they import start exporting new items. More specifically, when: 1. module N imports module M, 2. M is changed, but in a way that: a. preserves the exports that N imports b. does not introduce anything that forces recompilation downstream, such as orphan instances then we no longer require recompilation of N. Note that there is more to (2a) as initially meets the eye: - if N includes a whole module or "import hiding" import of M, then we require that the export list of M does not change, - if N only includes explicit imports, we check that the imported items don't change, e.g. - if we have @import M(T(K, f), g)@, we must check that N continues to export all these identifiers, with the same Avail structure (i.e. we should error if N stops bundling K or f with T) - if we have @import M(T(..))@, we must check that the children of T have not changed See Note [When to recompile when export lists change?] in GHC.Iface.Recomp. This is all tested in the new tests RecompExports{1,2,3,4,5} Fixes #25881 - - - - - f32d6c2b by Andreas Klebinger at 2025-04-07T22:01:25-04:00 NCG: AArch64 - Add -finter-module-far-jumps. When enabled the arm backend will assume jumps to targets outside of the current module are further than 128MB away. This will allow for code to work if: * The current module results in less than 128MB of code. * The whole program is loaded within a 4GB memory region. We have seen a few reports of broken linkers (#24648) where this flag might allow a program to compile/run successfully at a very small performance cost. ------------------------- Metric Increase: T783 ------------------------- - - - - - 553c280b by Andreas Klebinger at 2025-04-07T22:02:11-04:00 Revert "rts: fix small argument passing on big-endian arch (fix #23387)" Based on analysis documented in #25791 this doesn't fully fix the big while introducing new bugs on little endian architectures. A more complete fix will have to be implemented to fix #23387 This reverts commit 4f02d3c1a7b707e609bb3aea1dc6324fa19a5c39. - - - - - b0dc6599 by Andreas Klebinger at 2025-04-07T22:02:11-04:00 Interpreter: Fixes to handling of subword value reads/writes. Load subword values as full words from the stack truncating/expanding as neccesary when dealing with subwords. This way byte order is implicitly correct. This commit also fixes the order in which we are pushing literals onto the stack on big endian archs. Last but not least we enable a test for ghci which actually tests these subword operations. - - - - - ed38c09b by Cheng Shao at 2025-04-07T22:02:53-04:00 testsuite: don't test WasmControlFlow stdout This patch solves a potential test flakiness in `WasmControlFlow` by removing `WasmControlFlow.stdout` which is not so portable/stable as it seems. See added `Note [WasmControlFlow]` for more detailed explanation. - - - - - f807c590 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 debugger: Add docs to obtainTermFromId - - - - - 5dba052d by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 Move logic to find and set Breakpoint to GHC Breakpoints are uniquely identified by a module and an index unique within that module. `ModBreaks` of a Module contains arrays mapping from this unique breakpoint index to information about each breakpoint. For instance, `modBreaks_locs` stores the `SrcSpan` for each breakpoint. To find a breakpoint using the line number you need to go through all breakpoints in the array for a given module and look at the line and column stored in the `SrcSpan`s. Similarly for columns and finding breakpoints by name. This logic previously lived within the `GHCi` application sources, however, it is common to any GHC applications wanting to set breakpoints, like the upcoming `ghc-debugger`. This commit moves this logic for finding and setting breakpoints to the GHC library so it can be used by both `ghci` and `ghc-debugger`. - - - - - bc0b9f73 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 Refactor and move logic for identifier breakpoints Breakpoints can be set on functions using syntax of the form `[Module.]function`. The parsing, resolution (e.g. inferring implicit module), and validation of this syntax for referring to functions was tightly coupled with its GHCi use. This commit extracts the general purpose bits of resolving this syntax into `GHC.Runtime.Debugger.Breakpoints` so it can be further used by other GHC applications and to improve the code structure of GHCi. Moreover, a few utilities that do splitting and joining of identifiers as strings were moved to `GHC.Runtime.Eval.Utils`, which also can be used in the future to clean up `GHC.Runtime.Eval` a bit. - - - - - 4f728d21 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 debugger: derive Ord for BreakpointIds - - - - - 5528771c by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00 debugger: Move context utils from GHCi to GHC Moves `enclosingTickSpan`, `getCurrentBreakSpan`, and `getCurrentBreakModule`, general utilities on the internal debugger state, into the GHC library. - - - - - 4871f543 by sheaf at 2025-04-08T17:42:43-04:00 Implicit quantification in type synonyms: add test This adds a test for ticket #24090, which involves implicit quantification in type synonyms. The underlying issue was fixed in 0d4ee209dfe53e5074d786487f531dabc36d561c. - - - - - 48917d3c by sheaf at 2025-04-08T17:42:44-04:00 Turn on implicit-rhs-quantification by default This flag was added to GHC 9.8, and will be removed in a future GHC release. In preparation, this commit adds it to the default warning flags. - - - - - 629be068 by Rodrigo Mesquita at 2025-04-08T17:43:26-04:00 debugger: Add breakpoints to every Stmt While single-stepping through a Haskell program we stop at every breakpoint. However, we don't introduce breakpoints at every single expression (e.g. single variables) because they would be too many and uninteresting. That said, in a do-block, it is expected that stepping over would break at every line, even if it isn't particularly interesting (e.g. a single arg like getArgs). Moreover, let-statements in do-blocks, despite only being evaluated once needed, lead to surprising jumps while stepping through because some have outermost (outside the let) breakpoints while others don't. This commit makes every statement in a do-block have a breakpoint. This leads to predictable stepping through in a do-block. Duplicate breakpoints in the same location are avoided using the existing blacklist mechanism, which was missing a check in one relevant place. Fixes #25932 - - - - - 99a3affd by Matthew Pickering at 2025-04-08T17:44:08-04:00 driver: refactor: Split downsweep and MakeAction into separate modules. This will facilitate using the downsweep functions in other parts of the compiler than just --make mode. Also, the GHC.Driver.Make module was huge. Now it's still huge but slightly smaller! - - - - - ecfec4df by sheaf at 2025-04-09T14:13:12-04:00 Store user-written qualification in the GhcRn AST This commit ensures we store the original user-written module qualification in the renamed AST. This allows us to take into account the user-written qualification in error messages. Fixes #25877 - - - - - 97c884e2 by sheaf at 2025-04-09T14:13:12-04:00 TcRnIllegalTermLevelUse: simpler error when possible This commit makes GHC emit a simple error message in the case of an illegal term-level use of a data constructor: we will try to report an out-of-scope error instead of a "Illegal term level use" error, as the latter might be a bit overwhelming for newcomers. We do this when we have a data constructor import suggestion to provide to the user. For example: module M where { data A = A } module N where import M(A) x = Bool -- Illegal term-level use of Bool y = A -- Data constructor not in scope: A. -- Perhaps add 'A' to the import list of 'M'. This commit also revamps the "similar names" suggestion mechanism, and in particular its treatment of name spaces. Now, which name spaces we suggest is based solely on what we are looking for, and no longer on the NameSpace of the Name we have. This is because, for illegal term-level use errors, it doesn't make much sense to change the suggestions based on the fact that we resolved to e.g. a type constructor/class; what matters is what we were expecting to see in this position. See GHC.Rename.Unbound.{suggestionIsRelevant,relevantNameSpace} as well as the new constructors to GHC.Tc.Errors.Types.WhatLooking. Fixes #23982 - - - - - bff645ab by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00 driver: Split Session functions out of Main This commit moves out functions that help in creating and validating a GHC multi session from Main into the ghc library where they can be used by other GHC applications. Moreover, `Mode` processing and `checkOptions` linting were moved to separate modules within the ghc-bin executable package. In particular: - Move `Mode` types and functions (referring to the mode GHC is running on) to `ghc-bin:GHC.Driver.Session.Mode` - Move `checkOptions` and aux functions, which validates GHC DynFlags based on the mode, to `ghc-bin:GHC.Driver.Session.Lint` - Moves `initMulti`, `initMake`, and aux functions, which initializes a make/multi-unit session, into `ghc:GHC.Driver.Session.Units`. - - - - - 501b015e by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00 docs: Improve haddock of ExecComplete - - - - - dea98988 by Andreas Klebinger at 2025-04-09T19:23:57-04:00 Avoid oversaturing constructor workers. Constructor applications always need to take the exact number of arguments. If we can't ensure that instead apply the constructor worker like a regular function. Fixes #23865 - - - - - f1acdd2c by sheaf at 2025-04-09T19:25:41-04:00 NamedDefaults: require the class to be standard We now only default type variables if they only appear in constraints of the form `C v`, where `C` is either a standard class or a class with an in-scope default declaration. This rectifies an oversight in the original implementation of the NamedDefault extensions that was remarked in #25775; that implementation allowed type variables to appear in unary constraints which had arbitrary classes at the head. See the rewritten Note [How type-class constraints are defaulted] for details of the implementation. Fixes #25775 Fixes #25778 - - - - - 5712e0d6 by Vladislav Zavialov at 2025-04-10T05:17:38+00:00 Retry type/class declarations and instances (#12088) Retry type/class declarations and instances to account for non-lexical dependencies arising from type/data family instances. This patch improves the kind checker's ability to use type instances in kind checking of other declarations in the same module. * Key change: tcTyAndClassDecls now does multiple passes over the TyClGroups, as long as it is able to make progress. See the new Note [Retrying TyClGroups] in GHC.Tc.TyCl * Supporting change: FVs of a TyClGroup are now recorded in its extension field, namely XCTyClGroup. See the new Note [Prepare TyClGroup FVs] in GHC.Rename.Module * Instances are no longer inserted at the earliest positions where their FVs are bound. This is a simplification. See the new Note [Put instances at the end] in GHC.Rename.Module * Automatic unpacking is now more predictable, but fewer fields get unpacked by default. Use explicit {-# UNPACK #-} pragmas instead. See the new Note [Flaky -funbox-strict-fields with type/data families] For the wide range of newly accepted programs, consult the added test cases. Fixed tickets: #12088, #12239, #14668, #15561, #16410, #16448, #16693, #19611, #20875, #21172, #22257, #25238, #25834 Metric Decrease: T8095 - - - - - bc73a78d by sheaf at 2025-04-10T15:07:24-04:00 checkFamApp: don't be so eager to cycle break As remarked in #25933, a pure refactoring of checkTyEqRhs in ab77fc8c7adebd610aa0bd99d653f9a6cc78a374 inadvertently changed behaviour, as it caused GHC to introduce cycle-breaker variables in some unnecessary circumstances. This commit refactors 'GHC.Tc.Utils.Unify.checkFamApp' in a way that should restore the old behaviour, so that, when possible, we first recur into the arguments and only introduce a cycle breaker if this recursion fails (e.g. due to an occurs check failure). Fixes #25933 - - - - - 3acd8182 by Andreas Klebinger at 2025-04-10T22:32:12-04:00 Expand docs for RTS flag `-M`. The behaviour of how/when exceptions are raised was not really covered in the docs. - - - - - 026c1a39 by Adam Sandberg Ericsson at 2025-04-10T22:32:56-04:00 add cases for more SchedulerStatus codes in rts_checkSchedStatus - - - - - 5977c6a1 by sheaf at 2025-04-10T22:33:46-04:00 Squash warnings in GHC.Runtime.Heap.Inspect There were incomplete record selector warnings in GHC.Runtime.Heap.Inspect due to the use of the partial 'dataArgs' record selector. This is fixed by passing the fields to the 'extractSubTerms' function directly, rather than passing a value of the parent data type. - - - - - 6a3e38f5 by Andreas Klebinger at 2025-04-11T15:13:53-04:00 hadrian: Make ghcWithInterpreter the universal source of truth about availability of the interpreter We were doing some ad-hoc checks in different places in hadrian to determine whether we supported the interprter or not. Now this check if confined to one function, `ghcWithInterpreter`, and all the places which use this information consult `ghcWithInterpreter` to determine what to do. Fixes #25533. - - - - - 207de6f1 by Matthew Pickering at 2025-04-11T15:14:37-04:00 testsuite: Fix running TH tests with profiled dynamic compiler Previously, I had failed to update the ghc_th_way_flags logic for the profiled dynamic compiler. In addition to this `ghc_dynamic` was incorrectly set for profiled dynamic compiler. I also updated MultiLayerModulesTH_OneShot test to work for any compiler linkage rather than just dynamic. Fixes #25947 ------------------------- Metric Decrease: MultiLayerModulesTH_Make ------------------------- - - - - - 5455f2b9 by Matthew Pickering at 2025-04-12T08:31:36-04:00 driver: Add support for "Fixed" nodes in the ModuleGraph A fixed node in the module graph is one which we presume is already built. It's therefore up to the user to make sure that the interface file and any relevant artifacts are available for a fixed node. Fixed/Compile nodes are represented by the ModuleNodeInfo type, which abstracts the common parts of Fixed/Compile nodes with accessor functions of type `ModuleNodeInfo -> ...`. Fixed nodes can only depend on other fixed nodes. This invariant can be checked by the function `checkModuleGraph` or `mkModuleGraphChecked`. --make mode is modified to work with fixed mode. In order to "compile" a fixed node, the artifacts are just loaded into the HomePackageTable. Currently nothing in the compiler will produce Fixed nodes but this is tested with the FixedNodes GHC API test. In subsequent patches we are going to remove the ExternalModuleGraph and use Fixed nodes for modules in the module graph in oneshot mode. Fixes #25920 - - - - - ad64d5c2 by Cheng Shao at 2025-04-12T08:32:19-04:00 ci: remove manual case of ghc-wasm-meta downstream testing jobs This patch removes the manual case of ghc-wasm-meta downstream testing jobs; now the only way of including them in the pipeline and running them is via the test-wasm label. The reason of the removal is it proves to be problematic for MRs with only the wasm label; the wasm job would succeed, then the pipeline status would be waiting for manual action instead of succeeding. There needs to be separate jobs for the label-triggered and manual-triggered cases, but I don't think it's worth that extra complexity, the label-triggered case is already sufficient. - - - - - b34890c7 by Vladislav Zavialov at 2025-04-13T01:08:21+03:00 Fix EmptyCase panic in tcMatches (#25960) Due to faulty reasoning in Note [Pattern types for EmptyCase], tcMatches was too keen to panic. * Old (incorrect) assumption: pat_tys is a singleton list. This does not hold when \case{} is checked against a function type preceded by invisible forall. See the new T25960 test case. * New (hopefully correct) assumption: vis_pat_tys is a singleton list. This should follow from: checkArgCounts :: MatchGroup GhcRn ... -> TcM VisArity checkArgCounts (MG { mg_alts = L _ [] }) = return 1 ... - - - - - 84806ebc by Vladislav Zavialov at 2025-04-13T11:40:08-04:00 Remove unused type: TokenLocation - - - - - 05eb50df by Vladislav Zavialov at 2025-04-13T19:16:38-04:00 Register EpToken in Parser.PostProcess.Haddock (#22558) This change allows us to reject more badly placed Haddock comments. Examples: module -- | Bad comment for the module T17544_kw where data Foo -- | Bad comment for MkFoo where MkFoo :: Foo newtype Bar -- | Bad comment for MkBar where MkBar :: () -> Bar class Cls a -- | Bad comment for clsmethod where clsmethod :: a - - - - - 01944e5e by Vladislav Zavialov at 2025-04-13T19:17:21-04:00 Reject puns in T2T (#24153) This patch implements pun detection in T2T. Consider: x = 42 f, g :: forall a -> ... f (type x) = g x In accordance with the specification, the `g x` function call is renamed as a term, so `x` refers to the top-level binding `x = 42`, not to the type variable binding `type x` as one might expect. This is somewhat counterintuitive because `g` expects a type argument. Forbidding puns in T2T allows us to produce a helpful error message: Test.hs:5:16: error: [GHC-09591] Illegal punned variable occurrence in a required type argument. The name ‘x’ could refer to: ‘x’ defined at Test.hs:3:1 ‘x’ bound at Test.hs:5:9 This commit is a follow up to 0dfb1fa799af254c8a1e1045fc3996af2d57a613 where checking for puns was left as future work. - - - - - cc580552 by Vladislav Zavialov at 2025-04-13T19:18:02-04:00 Additional test cases for #12088, #13790 Extract more test cases from ticket discussions, including multi-module examples. Follow up to 5712e0d646f611dfbfedfd7ef6dff3a18c016edb - - - - - d47bf776 by Matthew Pickering at 2025-04-14T16:44:41+01:00 driver: Use ModuleGraph for oneshot and --make mode This patch uses the `hsc_mod_graph` field for both oneshot and --make mode. Therefore, if part of the compiler requires usage of the module graph, you do so in a uniform way for the two different modes. The `ModuleGraph` describes the relationship between the modules in the home package and units in external packages. The `ModuleGraph` can be queried when information about the transitive closure of a package is needed. For example, the primary use of the ModuleGraph from within the compiler is in the loader, which needs to know the transitive closure of a module so it can load all the relevant objects for evaluation. In --make mode, downsweep computes the ModuleGraph before any compilation starts. In oneshot mode, a thunk is created at the start of compilation, which when forced will compute the module graph beneath the current module. The thunk is only forced at the moment when the user uses Template Haskell. Finally, there are some situations where we need to discover what dependencies to load but haven't loaded a module graph at all. In this case, there is a fallback which computes the transitive closure on the fly and doesn't cache the result. Presumably if you are going to call getLinkDeps a lot, you would compute the right ModuleGraph before you started. Importantly, this removes the ExternalModuleGraph abstraction. This was quite awkward to work with since it stored information about the home package inside the EPS. This patch will also be very useful when implementing explicit level imports, which requires more significant use of the module graph in order to determine which level instances are available at. Towards #25795 ------------------------- Metric Decrease: MultiLayerModulesTH_Make MultiLayerModulesTH_OneShot ------------------------- - - - - - 395e0ad1 by sheaf at 2025-04-16T12:33:26-04:00 base: remove .Internal modules (e.g. GHC.TypeLits) This commit removes the following internal modules from base, as per CLC proposal 217: - GHC.TypeNats.Internal - GHC.TypeLits.Internal - GHC.ExecutionStack.Internal Fixes #25007 - - - - - e0f3ff11 by Patrick at 2025-04-17T04:31:12-04:00 Refactor Handling of Multiple Default Declarations Fixes: #25912, #25914, #25934 Previously, GHC discarded all loaded defaults (tcg_default) when local defaults were encountered during typechecking. According to the exportable-named-default proposal (sections 2.4.2 and 2.4.3), local defaults should be merged into tcg_default, retaining any defaults already present while overriding where necessary. Key Changes: * Introduce DefaultProvenance to track the origin of default declarations (local, imported, or built-in), replacing the original cd_module in ClassDefaults with cd_provenance :: DefaultProvenance. * Rename tcDefaults to tcDefaultDecls, limiting its responsibility to only converting renamed class defaults into ClassDefaults. * Add extendDefaultEnvWithLocalDefaults to merge local defaults into the environment, with proper duplication checks: - Duplicate local defaults for a class trigger an error. - Local defaults override imported or built-in defaults. * Update and add related notes: Note [Builtin class defaults], Note [DefaultProvenance]. * Add regression tests: T25912, T25914, T25934. Thanks sam and simon for the help on this patch. Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> - - - - - 386f1854 by Teo Camarasu at 2025-04-17T04:31:55-04:00 template-haskell: Remove `addrToByteArrayName` and `addrToByteArray` These were part of the implementation of the `Lift ByteArray` instance and were errornously exported because this module lacked an explicit export list. They have no usages on Hackage. Resolves #24782 - - - - - b96e2f77 by Sylvain Henry at 2025-04-18T20:46:33-04:00 RTS: remove target info and fix host info (#24058) The RTS isn't a compiler, hence it doesn't have a target and we remove the reported target info displayed by "+RTS --info". We also fix the host info displayed by "+RTS --info": the host of the RTS is the RTS-building compiler's target, not the compiler's host (wrong when doing cross-compilation). - - - - - 6d9965f4 by Sylvain Henry at 2025-04-18T20:46:33-04:00 RTS: remove build info As per the discussion in !13967, there is no reason to tag the RTS with information about the build platform. - - - - - d52e9b3f by Vladislav Zavialov at 2025-04-18T20:47:15-04:00 Diagnostics: remove the KindMismatch constructor (#25957) The KindMismatch constructor was only used as an intermediate representation in pretty-printing. Its removal addresses a problem detected by the "codes" test case: [GHC-89223] is untested (constructor = KindMismatch) In a concious deviation from the usual procedure, the error code GHC-89223 is removed entirely rather than marked as Outdated. The reason is that it never was user-facing in the first place. - - - - - e2f2f9d0 by Vladislav Zavialov at 2025-04-20T10:53:39-04:00 Add name for -Wunusable-unpack-pragmas This warning had no name or flag and was triggered unconditionally. Now it is part of -Wdefault. In GHC.Tc.TyCl.tcTyClGroupsPass's strict mode, we now have to force-enable this warning to ensure that detection of flawed groups continues to work even if the user disables the warning with the -Wno-unusable-unpack-pragmas option. Test case: T3990c Also, the misnamed BackpackUnpackAbstractType is now called UnusableUnpackPragma. - - - - - 6caa6508 by Adam Gundry at 2025-04-20T10:54:22-04:00 Fix specialisation of incoherent instances (fixes #25883) GHC normally assumes that class constraints are canonical, meaning that the specialiser is allowed to replace one dictionary argument with another provided that they have the same type. The `-fno-specialise-incoherents` flag alters INCOHERENT instance definitions so that they will prevent specialisation in some cases, by inserting `nospec`. This commit fixes a bug in 7124e4ad76d98f1fc246ada4fd7bf64413ff2f2e, which treated some INCOHERENT instance matches as if `-fno-specialise-incoherents` was in effect, thereby unnecessarily preventing specialisation. In addition it updates the relevant `Note [Rules for instance lookup]` and adds a new `Note [Canonicity for incoherent matches]`. - - - - - 0426fd6c by Adam Gundry at 2025-04-20T10:54:23-04:00 Add regression test for #23429 - - - - - eec96527 by Adam Gundry at 2025-04-20T10:54:23-04:00 user's guide: update specification of overlapping/incoherent instances The description of the instance resolution algorithm in the user's guide was slightly out of date, because it mentioned in-scope given constraints only at the end, whereas the implementation checks for their presence before any of the other steps. This also adds a warning to the user's guide about the impact of incoherent instances on specialisation, and more clearly documents some of the other effects of `-XIncoherentInstances`. - - - - - a00eeaec by Matthew Craven at 2025-04-20T10:55:03-04:00 Fix bytecode generation for `tagToEnum# <LITERAL>` Fixes #25975. - - - - - 2e204269 by Andreas Klebinger at 2025-04-22T12:20:41+02:00 Simplifier: Constant fold invald tagToEnum# calls to bottom expr. When applying tagToEnum# to a out-of-range value it's best to simply constant fold it to a bottom expression. That potentially allows more dead code elimination and makes debugging easier. Fixes #25976 - - - - - 7250fc0c by Matthew Pickering at 2025-04-22T16:24:04-04:00 Move -fno-code note into Downsweep module This note was left behind when all the code which referred to it was moved into the GHC.Driver.Downsweep module - - - - - d2dc89b4 by Matthew Pickering at 2025-04-22T16:24:04-04:00 Apply editing notes to Note [-fno-code mode] suggested by sheaf These notes were suggested in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14241 - - - - - 91564daf by Matthew Pickering at 2025-04-24T00:29:02-04:00 ghci: Use loadInterfaceForModule rather than loadSrcInterface in mkTopLevEnv loadSrcInterface takes a user given `ModuleName` and resolves it to the module which needs to be loaded (taking into account module renaming/visibility etc). loadInterfaceForModule takes a specific module and loads it. The modules in `ImpDeclSpec` have already been resolved to the actual module to get the information from during renaming. Therefore we just need to fetch the precise interface from disk (and not attempt to rename it again). Fixes #25951 - - - - - 2e0c07ab by Simon Peyton Jones at 2025-04-24T00:29:43-04:00 Test for #23298 - - - - - 0eef99b0 by Sven Tennie at 2025-04-24T07:34:36-04:00 RV64: Introduce J instruction (non-local jumps) and don't deallocate stack slots for J_TBL (#25738) J_TBL result in local jumps, there should not deallocate stack slots (see Note [extra spill slots].) J is for non-local jumps, these may need to deallocate stack slots. - - - - - 1bd3d13e by fendor at 2025-04-24T07:35:17-04:00 Add `UnitId` to `EvalBreakpoint` The `EvalBreakpoint` is used to communicate that a breakpoint was encountered during code evaluation. This `EvalBreakpoint` needs to be converted to an `InternalBreakpointId` which stores a `Module` to uniquely find the correct `Module` in the Home Package Table. The `EvalBreakpoint` used to store only a `ModuleName` which is then converted to a `Module` based on the currently active home unit. This is incorrect in the face of multiple home units, the break point could be in an entirely other home unit! To fix this, we additionally store the `UnitId` of the `Module` in `EvalBreakpoint` to later reconstruct the correct `Module` All of the changes are the consequence of extending `EvalBreakpoint` with the additional `ShortByteString` of the `UnitId`. For performance reasons, we store the `ShortByteString` backing the `UnitId` directly, avoiding marshalling overhead. - - - - - fe6ed8d9 by Sylvain Henry at 2025-04-24T18:04:12-04:00 Doc: add doc for JS interruptible calling convention (#24444) - - - - - 6111c5e4 by Ben Gamari at 2025-04-24T18:04:53-04:00 compiler: Ensure that Panic.Plain.assertPanic' provides callstack In 36cddd2ce1a3bc62ea8a1307d8bc6006d54109cf @alt-romes removed CallStack output from `GHC.Utils.Panic.Plain.assertPanic'`. While this output is redundant due to the exception backtrace proposal, we may be bootstrapping with a compiler which does not yet include this machinery. Reintroduce the output for now. Fixes #25898. - - - - - 217caad1 by Matthew Pickering at 2025-04-25T18:58:42+01:00 Implement Explicit Level Imports for Template Haskell This commit introduces the `ExplicitLevelImports` and `ImplicitStagePersistence` language extensions as proposed in GHC Proposal #682. Key Features ------------ - `ExplicitLevelImports` adds two new import modifiers - `splice` and `quote` - allowing precise control over the level at which imported identifiers are available - `ImplicitStagePersistence` (enabled by default) preserves existing path-based cross-stage persistence behavior - `NoImplicitStagePersistence` disables implicit cross-stage persistence, requiring explicit level imports Benefits -------- - Improved compilation performance by reducing unnecessary code generation - Enhanced IDE experience with faster feedback in `-fno-code` mode - Better dependency tracking by distinguishing compile-time and runtime dependencies - Foundation for future cross-compilation improvements This implementation enables the separation of modules needed at compile-time from those needed at runtime, allowing for more efficient compilation pipelines and clearer code organization in projects using Template Haskell. Implementation Notes -------------------- The level which a name is availble at is stored in the 'GRE', in the normal GlobalRdrEnv. The function `greLevels` returns the levels which a specific GRE is imported at. The level information for a 'Name' is computed by `getCurrentAndBindLevel`. The level validity is checked by `checkCrossLevelLifting`. Instances are checked by `checkWellLevelledDFun`, which computes the level an instance by calling `checkWellLevelledInstanceWhat`, which sees what is available at by looking at the module graph. Modifications to downsweep -------------------------- Code generation is now only enabled for modules which are needed at compile time. See the Note [-fno-code mode] for more information. Uniform error messages for level errors --------------------------------------- All error messages to do with levels are now reported uniformly using the `TcRnBadlyStaged` constructor. Error messages are uniformly reported in terms of levels. 0 - top-level 1 - quote level -1 - splice level The only level hard-coded into the compiler is the top-level in GHC.Types.ThLevelIndex.topLevelIndex. Uniformly refer to levels and stages ------------------------------------ There was much confusion about levels vs stages in the compiler. A level is a semantic concept, used by the typechecker to ensure a program can be evaluated in a well-staged manner. A stage is an operational construct, program evaluation proceeds in stages. Deprecate -Wbadly-staged-types ------------------------------ `-Wbadly-staged-types` is deprecated in favour of `-Wbadly-levelled-types`. Lift derivation changed ----------------------- Derived lift instances will now not generate code with expression quotations. Before: ``` data A = A Int deriving Lift => lift (A x) = [| A $(lift x) |] ``` After: ``` lift (A x) = conE 'A `appE` (lift x) ``` This is because if you attempt to derive `Lift` in a module where `NoImplicitStagePersistence` is enabled, you would get an infinite loop where a constructor was attempted to be persisted using the instance you are currently defining. GHC API Changes --------------- The ModuleGraph now contains additional information about the type of the edges (normal, quote or splice) between modules. This is abstracted using the `ModuleGraphEdge` data type. Fixes #25828 ------------------------- Metric Increase: MultiLayerModulesTH_Make ------------------------- - - - - - 7641a74a by Simon Peyton Jones at 2025-04-26T22:05:19-04:00 Get a decent MatchContext for pattern synonym bindings In particular when we have a pattern binding K p1 .. pn = rhs where K is a pattern synonym. (It might be nested.) This small MR fixes #25995. It's a tiny fix, to an error message, removing an always-dubious `unkSkol`. The bug report was in the context of horde-ad, a big program, and I didn't manage to make a small repro case quickly. I decided not to bother further. - - - - - ce616f49 by Simon Peyton Jones at 2025-04-27T21:10:25+01:00 Fix infelicities in the Specialiser On the way to #23109 (unary classes) I discovered some infelicities (or maybe tiny bugs, I forget) in the type-class specialiser. I also tripped over #25965, an outright bug in the rule matcher Specifically: * Refactor: I enhanced `wantCallsFor`, whih previously always said `True`, to discard calls of class-ops, data constructors etc. This is a bit more efficient; and it means we don't need to worry about filtering them out later. * Fix: I tidied up some tricky logic that eliminated redundant specialisations. It wasn't working correctly. See the expanded Note [Specialisations already covered], and (MP3) in Note [Specialising polymorphic dictionaries]. See also the new top-level `alreadyCovered` function, which now goes via `GHC.Core.Rules.ruleLhsIsMoreSpecific` I also added a useful Note [The (CI-KEY) invariant] * Fix #25965: fixed a tricky bug in the `go_fam_fam` in `GHC.Core.Unify.uVarOrFam`, which allows matching to succeed without binding all type varibles. I enhanced Note [Apartness and type families] some more * #25703. This ticket "just works" with -fpolymorphic-specialisation; but I was surprised that it worked! In this MR I added documentation to Note [Interesting dictionary arguments] to explain; and tests to ensure it stays fixed. - - - - - 22d11fa8 by Simon Peyton Jones at 2025-04-28T18:05:19-04:00 Track rewriter sets more accurately in constraint solving The key change, which fixed #25440, is to call `recordRewriter` in GHC.Tc.Solver.Rewrite.rewrite_exact_fam_app. This missing call meant that we were secretly rewriting a Wanted with a Wanted, but not really noticing; and that led to a very bad error message, as you can see in the ticket. But of course that led me into rabbit hole of other refactoring around the RewriteSet code: * Improve Notes [Wanteds rewrite Wanteds] * Zonk the RewriterSet in `zonkCtEvidence` rather than only in GHC.Tc.Errors. This is tidier anyway (e.g. de-clutters debug output), and helps with the next point. * In GHC.Tc.Solver.Equality.inertsCanDischarge, don't replace a constraint with no rewriters with an equal constraint that has many. See See (CE4) in Note [Combining equalities] * Move zonkRewriterSet and friends from GHC.Tc.Zonk.Type into GHC.Tc.Zonk.TcType, where they properly belong. A handful of tests get better error messages. For some reason T24984 gets 12% less compiler allocation -- good Metric Decrease: T24984 - - - - - 6467d61e by Brandon Chinn at 2025-04-29T18:36:03-04:00 Fix lexing "\^\" (#25937) This broke in the refactor in !13128, where the old code parsed escape codes and collapsed string gaps at the same time, but the new code collapsed gaps first, then resolved escape codes. The new code used a naive heuristic to skip escaped backslashes, but didn't account for "\^\". - - - - - 99868a86 by Jens Petersen at 2025-04-29T18:36:44-04:00 hadrian: default selftest to disabled - - - - - aba2a4a5 by Zubin Duggal at 2025-04-30T06:35:59-04:00 get-win32-tarballs.py: List tarball files to be downloaded if we cannot find them Fixes #25929 - - - - - d99a617b by Ben Gamari at 2025-04-30T06:36:40-04:00 Move Data ModuleName instance to Language.Haskell.Syntax.Module.Name Fixes #25968. - - - - - 9995c2b7 by Serge S. Gulin at 2025-05-04T17:13:36+03:00 Support for ARM64 Windows (LLVM-enabled) (fixes #24603) 1. Add Windows AArch64 cross-compilation support via CI jobs Introduce new CI configurations for cross-compiling to Windows ARM64 using Debian12Wine, FEX, and MSYS2. Configure toolchain variables for LLVM MinGW and Wine emulation in CI pipelines. 2. Adjust compiler and RTS for AArch64 Windows compatibility Reserve register `x18` on Windows and Darwin platforms in AArch64 codegen. Handle Windows-specific relocations and data sections in AArch64 assembler. Update PEi386 linker to recognize ARM64 binaries and support exception handling. Adjust LLVM target definitions and data layouts for new architectures. Update `ghc-toolchain` and build scripts to handle `TablesNextToCode` on Windows ARM64. 3. Enhance CI scripts and stability Modify `ci.sh` to handle mingw cross-targets, fixing GHC executable paths and test execution. Use `diff -w` in tests to ignore whitespace differences, improving cross-platform consistency. 4. Refactor and clean up code Remove redundant imports in hello.hs test. Improve error messages and checks for unsupported configurations in the driver. Add `EXDEV` error code to `errno.js`. Add async/sync flags to IO logs at `base.js`. Improve POSIX compatibility for file close at `base.js`: decrease indeterminism for mixed cases of async and sync code. 5. Update dependencies: `Cabal`, `Win32`, `directory`, `process`, `haskeline`, and `unix`. submodule Co-authored-by: Cheng Shao <terrorjack(a)type.dance> Co-authored-by: Dmitrii Egorov <egorov.d.i(a)icloud.com> Co-authored-by: Andrei Borzenkov <root(a)sandwitch.dev> - - - - - 50fa8165 by Javran Cheng at 2025-05-05T05:55:39-04:00 Suppress unused do-binding if discarded variable is Any or ZonkAny. Consider example (#25895): > do { forever (return ()); blah } where `forever :: forall a b. IO a -> IO b`. Nothing constrains `b`, so it will be instantiates with `Any` or `ZonkAny`. But we certainly don't want to complain about a discarded do-binding. Fixes #25895 - - - - - e46c6b18 by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00 Refactor mkTopLevImportedEnv out of mkTopLevEnv This makes the code clearer and allows the top-level import context to be fetched directly from the HomeModInfo through the API (e.g. useful for the debugger). - - - - - 0ce0d263 by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00 Export sizeOccEnv from GHC.Types.Name.Occurrence Counts the number of OccNames in an OccEnv - - - - - 165f98d8 by Simon Peyton Jones at 2025-05-06T09:02:39-04:00 Fix a bad untouchability bug im simplifyInfer This patch addresses #26004. The root cause was that simplifyInfer was willing to unify variables "far out". The fix, in runTcSWithEvBinds', is to initialise the inert set given-eq level with the current level. See (TGE6) in Note [Tracking Given equalities] in GHC.Tc.Solver.InertSet Two loosely related refactors: * Refactored approximateWCX to return just the free type variables of the un-quantified constraints. That avoids duplication of work (these free vars are needed in simplifyInfer) and makes it clearer that the constraints themselves are irrelevant. * A little local refactor of TcSMode, which reduces the number of parameters to runTcSWithEvBinds - - - - - 6e67fa08 by Ben Gamari at 2025-05-08T06:21:21-04:00 llvmGen: Fix built-in variable predicate Previously the predicate to identify LLVM builtin global variables was checking for `$llvm` rather than `@llvm` as it should. - - - - - a9d0a22c by Ben Gamari at 2025-05-08T06:21:22-04:00 llvmGen: Fix linkage of built-in arrays LLVM now insists that built-in arrays use Appending linkage, not Internal. Fixes #25769. - - - - - 9c6d2b1b by sheaf at 2025-05-08T06:22:11-04:00 Use mkTrAppChecked in ds_ev_typeable This change avoids violating the invariant of mkTrApp according to which the argument should not be a fully saturated function type. This ensures we don't return false negatives for type equality involving function types. Fixes #25998 - - - - - 75cadf81 by Ryan Hendrickson at 2025-05-08T06:22:55-04:00 haddock: Preserve indentation in multiline examples Intended for use with :{ :}, but doesn't look for those characters. Any consecutive lines with birdtracks will only have initial whitespace stripped up to the column of the first line. - - - - - fee9b351 by Cheng Shao at 2025-05-08T06:23:36-04:00 ci: re-enable chrome for wasm ghci browser tests Currently only firefox is enabled for wasm ghci browser tests, for some reason testing with chrome works on my machine but gets stuck on gitlab instance runners. This patch re-enables testing with chrome by passing `--no-sandbox`, since chrome sandboxing doesn't work in containers without `--cap-add=SYS_ADMIN`. - - - - - 282df905 by Vladislav Zavialov at 2025-05-09T03:18:25-04:00 Take subordinate 'type' specifiers into account This patch fixes multiple bugs (#22581, #25983, #25984, #25991) in name resolution of subordinate import lists. Bug #22581 ---------- In subordinate import lists, the use of the `type` namespace specifier used to be ignored. For example, this import statement was incorrectly accepted: import Prelude (Bool(type True)) Now it results in an error message: <interactive>:2:17: error: [GHC-51433] In the import of ‘Prelude’: a data type called ‘Bool’ is exported, but its subordinate item ‘True’ is not in the type namespace. Bug #25983 ---------- In subordinate import lists within a `hiding` clause, non-existent items led to a poor warning message with -Wdodgy-imports. Consider: import Prelude hiding (Bool(X)) The warning message for this import statement used to misreport the cause of the problem: <interactive>:3:24: warning: [GHC-56449] [-Wdodgy-imports] In the import of ‘Prelude’: an item called ‘Bool’ is exported, but it is a type. Now the warning message is correct: <interactive>:2:24: warning: [GHC-10237] [-Wdodgy-imports] In the import of ‘Prelude’: a data type called ‘Bool’ is exported, but it does not export any constructors or record fields called ‘X’. Bug #25984 ---------- In subordinate import lists within a `hiding` clause, non-existent items resulted in the entire import declaration being discarded. For example, this program was incorrectly accepted: import Prelude hiding (Bool(True,X)) t = True Now it results in an error message: <interactive>:2:5: error: [GHC-88464] Data constructor not in scope: True Bug #25991 ---------- In subordinate import lists, it was not possible to refer to a class method if there was an associated type of the same name: module M_helper where class C a b where type a # b (#) :: a -> b -> () module M where import M_helper (C((#))) This import declaration failed with: M.hs:2:28: error: [GHC-10237] In the import of ‘M_helper’: an item called ‘C’ is exported, but it does not export any children (constructors, class methods or field names) called ‘#’. Now it is accepted. Summary ------- The changes required to fix these bugs are almost entirely confined to GHC.Rename.Names. Other than that, there is a new error constructor BadImportNonTypeSubordinates with error code [GHC-51433]. Test cases: T22581a T22581b T22581c T22581d T25983a T25983b T25983c T25983d T25983e T25983f T25983g T25984a T25984b T25991a T25991b1 T25991b2 - - - - - 51b0ce8f by Simon Peyton Jones at 2025-05-09T03:19:07-04:00 Slighty improve `dropMisleading` Fix #26105, by upgrading the (horrible, hacky) `dropMisleading` function. This fix makes things a bit better but does not cure the underlying problem. - - - - - 7b2d1e6d by Simon Peyton Jones at 2025-05-11T03:24:47-04:00 Refine `noGivenNewtypeReprEqs` to account for quantified constraints This little MR fixes #26020. We are on the edge of completeness for newtype equalities (that doesn't change) but this MR makes GHC a bit more consistent -- and fixes the bug reported. - - - - - eaa8093b by Cheng Shao at 2025-05-11T03:25:28-04:00 wasm: mark freeJSVal as INLINE This patch marks `freeJSVal` as `INLINE` for the wasm backend. I noticed that the `freeJSVal` invocations are not inlined when inspecting STG/Cmm dumps of downstream libraries that use release build of the wasm backend. The performance benefit of inlining here is very modest, but so is the cost anyway; if you are using `freeJSVal` at all then you care about every potential chance to improve performance :) - - - - - eac196df by Cheng Shao at 2025-05-11T03:25:28-04:00 wasm: add zero length fast path for fromJSString This patch adds a zero length fast path for `fromJSString`; when marshaling a zero-length `JSString` we don't need to allocate an empty `ByteArray#` at all. - - - - - 652cba7e by Peng Fan at 2025-05-14T04:24:35-04:00 Add LoongArch NCG support Not supported before. - - - - - c01f4374 by Lin Runze at 2025-05-14T04:24:35-04:00 ci: Add LoongArch64 cross-compile CI for testing - - - - - ce6cf240 by Ben Gamari at 2025-05-14T04:25:18-04:00 rts/linker: Don't fail due to RTLD_NOW In !12264 we started using the NativeObj machinery introduced some time ago for loading of shared objects. One of the side-effects of this change is shared objects are now loaded eagerly (i.e. with `RTLD_NOW`). This is needed by NativeObj to ensure full visibility of the mappings of the loaded object, which is in turn needed for safe shared object unloading. Unfortunately, this change subtly regressed, causing compilation failures in some programs. Specifically, shared objects which refer to undefined symbols (e.g. which may be usually provided by either the executable image or libraries loaded via `dlopen`) will fail to load with eager binding. This is problematic as GHC loads all package dependencies while, e.g., evaluating TemplateHaskell splices. This results in compilation failures in programs depending upon (but not using at compile-time) packages with undefined symbol references. To mitigate this NativeObj now first attempts to load an object via eager binding, reverting to lazy binding (and disabling unloading) on failure. See Note [Don't fail due to RTLD_NOW]. Fixes #25943. - - - - - 88ee8bb5 by Sylvain Henry at 2025-05-14T04:26:15-04:00 Deprecate GHC.JS.Prim.Internal.Build (#23432) Deprecated as per CLC proposal 329 (https://github.com/haskell/core-libraries-committee/issues/329) - - - - - b4ed465b by Cheng Shao at 2025-05-14T04:26:57-04:00 libffi: update to 3.4.8 Bumps libffi submodule. - - - - - a3e71296 by Matthew Pickering at 2025-05-14T04:27:38-04:00 Remove leftover trace - - - - - 2d0ecdc6 by Cheng Shao at 2025-05-14T04:28:19-04:00 Revert "ci: re-enable chrome for wasm ghci browser tests" This reverts commit fee9b351fa5a35d5778d1252789eacaaf5663ae8. Unfortunately the chrome test jobs may still timeout on certain runners (e.g. OpenCape) for unknown reasons. - - - - - 3b3a5dec by Ben Gamari at 2025-05-15T16:10:01-04:00 Don't emit unprintable characters when printing Uniques When faced with an unprintable tag we now instead print the codepoint number. Fixes #25989. (cherry picked from commit e832b1fadee66e8d6dd7b019368974756f8f8c46) - - - - - e1ef8974 by Mike Pilgrem at 2025-05-16T16:09:14-04:00 Translate iff in Haddock documentation into everyday English - - - - - fd64667d by Vladislav Zavialov at 2025-05-20T03:25:08-04:00 Allow the 'data' keyword in import/export lists (#25899) This patch introduces the 'data' namespace specifier in import and export lists. The intended use is to import data constructors without their parent type constructors, e.g. import Data.Proxy as D (data Proxy) type DP = D.Proxy -- promoted data constructor Additionally, it is possible to use 'data' to explicitly qualify any data constructors or terms, incl. operators and field selectors import Prelude (Semigroup(data (<>))) import Data.Function (data (&)) import Data.Monoid (data Dual, data getDual) x = Dual "Hello" <> Dual "World" & getDual The implementation mostly builds on top of the existing logic for the 'type' and 'pattern' namespace specifiers, plus there are a few tweaks to how we generate suggestions in error messages. - - - - - acc86753 by Ben Gamari at 2025-05-20T03:25:51-04:00 compiler: Use field selectors when creating BCOs This makes it easier to grep for these fields. - - - - - 60a55fd7 by Ben Gamari at 2025-05-20T03:25:51-04:00 compiler: Clarify BCO size Previously the semantics and size of StgBCO was a bit unclear. Specifically, the `size` field was documented to contain the size of the bitmap whereas it was actually the size of the closure *and* bitmap. Additionally, it was not as clear as it could be that the bitmap was a full StgLargeBitmap with its own `size` field. - - - - - ac9fb269 by Simon Peyton Jones at 2025-05-20T09:19:04-04:00 Track rewriter sets more accurately in constraint solving This MR addresses #26003, by refactoring the arcane intricacies of Note [Equalities with incompatible kinds]. NB: now retitled to Note [Equalities with heterogeneous kinds]. and the main Note for this MR. In particular: * Abandon invariant (COERCION-HOLE) in Note [Unification preconditions] in GHC.Tc.Utils.Unify. * Abandon invariant (TyEq:CH)) in Note [Canonical equalities] in GHC.Tc.Types.Constraint. * Instead: add invariant (REWRITERS) to Note [Unification preconditions]: unify only if the constraint has an empty rewriter set. Implementation: * In canEqCanLHSFinish_try_unification, skip trying unification if there is a non-empty rewriter set. * To do this, make sure the rewriter set is zonked; do so in selectNextWorkItem, which also deals with prioritisation. * When a coercion hole is filled, kick out inert equalities that have that hole as a rewriter. It might now be unlocked and available to unify. * Remove the ad-hoc `ch_hetero_kind` field of `CoercionHole`. * In `selectNextWorkItem`, priorities equalities withan empty rewriter set. * Defaulting: see (DE6) in Note [Defaulting equalities] and Note [Limited defaulting in the ambiguity check] * Concreteness checks: there is some extra faff to try to get decent error messages when the FRR (representation-polymorphism) checks fail. In partiular, add a "When unifying..." explanation when the representation-polymorphism check arose from another constraint. - - - - - 86406f48 by Cheng Shao at 2025-05-20T09:19:47-04:00 rts: fix rts_clearMemory logic when sanity checks are enabled This commit fixes an RTS assertion failure when invoking rts_clearMemory with +RTS -DS. -DS implies -DZ which asserts that free blocks contain 0xaa as the designated garbage value. Also adds the sanity way to rts_clearMemory test to prevent future regression. Closes #26011. ChatGPT Codex automatically diagnosed the issue and proposed the initial patch in a single shot, given a GHC checkout and the following prompt: --- Someone is reporting the following error when attempting to use `rts_clearMemory` with the RTS option `-DS`: ``` test.wasm: internal error: ASSERTION FAILED: file rts/sm/Storage.c, line 1216 (GHC version 9.12.2.20250327 for wasm32_unknown_wasi) Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug ``` What's the culprit? How do I look into this issue? --- I manually reviewed & revised the patch, tested and submitted it. - - - - - 7147370b by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: do not allocate strings in bytecode assembler This patch refactors the compiler to avoid allocating iserv buffers for BCONPtrStr at assemble-time. Now BCONPtrStr ByteStrings are recorded as a part of CompiledByteCode, and actual allocation only happens at link-time. This refactoring is necessary for adding bytecode serialization functionality, as explained by the revised comments in this commit. - - - - - a67db612 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: make bc_strs serializable This commit makes the bc_strs field in CompiledByteCode serializable; similar to previous commit, we preserve the ByteString directly and defer the actual allocation to link-time, as mentioned in updated comment. - - - - - 5faf34ef by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: make bc_itbls serializable This commit makes bc_itbls in CompiledByteCode serializable. A dedicated ConInfoTable datatype has been added in ghci which is the recipe for dynamically making a datacon's info table, containing the payload of the MkConInfoTable iserv message. - - - - - 2abaf8c1 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: remove FFIInfo bookkeeping in BCO This commit removes the bc_ffis field from CompiledByteCode completely, as well as all the related bookkeeping logic in GHC.StgToByteCode. bc_ffis is actually *unused* in the rest of GHC codebase! It is merely a list of FFIInfo, which is just a remote pointer of the libffi ffi_cif struct; once we allocate the ffi_cif struct and put its pointer in a CCALL instruction, we'll never free it anyway. So there is no point of bookkeeping. - - - - - adb9e4d2 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: make FFIInfo serializable in BCO This commit makes all the FFIInfo needed in CCALL instructions serializable. Previously, when doing STG to BCO lowering, we would allocate a libffi ffi_cif struct and keep its remote pointer as FFIInfo; but actually we can just keep the type signature as FFIInfo and defer the actual allocation to link-time. - - - - - 200f401b by Cheng Shao at 2025-05-20T17:22:19-04:00 ghci: remove redundant NewBreakModule message This commit removes the redundant NewBreakModule message from ghci: it just allocates two strings! This functionality can be implemented with existing MallocStrings in one iserv call. - - - - - ddaadca6 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: make breakpoint module name and unit id serializable This commit makes breakpoint module name and unit id serializable, in BRK_FUN instructions as well as ModBreaks. We can simply keep the module name and unit ids, and defer the buffer allocation to link time. - - - - - a0fde202 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: remove unused newModule This commit removes the now unused newModule function from GHC. - - - - - 68c8f140 by Cheng Shao at 2025-05-20T17:22:19-04:00 compiler: add BCONPtrFS for interned top level string literals in BCO This commit adds BCONPtrFS as a BCO non-pointer literal kind, which has the same semantics of BCONPtrStr, except it contains a FastString instead of a ByteString. By using BCONPtrFS to represent top level string literals that are already FastString in the compilation pipeline, we enjoy the FastString interning logic and avoid allocating a bunch of redundant ByteStrings for the same FastStrings, especially when we lower the BRK_FUN instruction. - - - - - f2b532bc by Peng Fan at 2025-05-20T17:23:15-04:00 hadrian: enable GHCi for loongarch64 - - - - - 8ded2330 by kwxm at 2025-05-20T17:24:07-04:00 Fix bugs in `integerRecipMod` and `integerPowMod` This fixes #26017. * `integerRecipMod x 1` now returns `(# 1 | #)` for all x; previously it incorrectly returned `(# | () #)`, indicating failure. * `integerPowMod 0 e m` now returns `(# | () #)` for e<0 and m>1, indicating failure; previously it incorrectly returned `(# 0 | #)`. - - - - - c9abb87c by Andreas Klebinger at 2025-05-20T17:24:50-04:00 Specialise: Don't float out constraint components. It was fairly complex to do so and it doesn't seem to improve anything. Nofib allocations were unaffected as well. See also Historical Note [Floating dictionaries out of cases] - - - - - 202b201c by Andreas Klebinger at 2025-05-21T10:16:14-04:00 Interpreter: Add limited support for direct primop evaluation. This commit adds support for a number of primops directly to the interpreter. This avoids the indirection of going through the primop wrapper for those primops speeding interpretation of optimized code up massively. Code involving IntSet runs about 25% faster with optimized core and these changes. For core without breakpoints it's even more pronouced and I saw reductions in runtime by up to 50%. Running GHC itself in the interpreter was sped up by ~15% through this change. Additionally this comment does a few other related changes: testsuite: * Run foundation test in ghci and ghci-opt ways to test these primops. * Vastly expand the foundation test to cover all basic primops by comparing result with the result of calling the wrapper. Interpreter: * When pushing arguments for interpreted primops extend each argument to at least word with when pushing. This avoids some issues with big endian. We can revisit this if it causes performance issues. * Restructure the stack chunk check logic. There are now macros for read accesses which might cross stack chunk boundries and macros which omit the checks which are used when we statically know we access an address in the current stack chunk. - - - - - 67a177b4 by sheaf at 2025-05-21T10:17:04-04:00 QuickLook: do a shape test before unifying This commit ensures we do a shape test before unifying. This ensures we don't try to unify a TyVarTv with a non-tyvar, e.g. alpha[tyv] := Int On the way, we refactor simpleUnifyCheck: 1. Move the checkTopShape check into simpleUnifyCheck 2. Refactors simpleUnifyCheck to return a value of the new type SimpleUnifyResult type. Now, simpleUnifyCheck returns "can unify", "cannot unify" or "dunno" (with "cannot unify" being the new result it can return). Now: - touchabilityTest is included; it it fails we return "cannot unify" - checkTopShape now returns "cannot unify" instead of "dunno" upon failure 3. Move the call to simpleUnifyCheck out of checkTouchableTyVarEq. After that, checkTouchableTyVarEq becames a simple call to checkTyEqRhs, so we inline it. This allows the logic in canEqCanLHSFinish_try_unification to be simplified. In particular, we now avoid calling 'checkTopShape' twice. Two further changes suggested by Simon were also implemented: - In canEqCanLHSFinish, if checkTyEqRhs returns PuFail with 'do_not_prevent_rewriting', we now **continue with this constraint**. This allows us to use the constraint for rewriting. - checkTyEqRhs now has a top-level check to avoid flattening a tyfam app in a top-level equality of the form alpha ~ F tys, as this is going around in circles. This simplifies the implementation without any change in behaviour. Fixes #25950 Fixes #26030 - - - - - 4020972c by sheaf at 2025-05-21T10:17:04-04:00 FixedRuntimeRepError: omit unhelpful explanation This commit tweaks the FixedRuntimeRepError case of pprTcSolverReportMsg, to avoid including an explanation which refers to a type variable that appears nowhere else. For example, the old error message could look like the following: The pattern binding does not have a fixed runtime representation. Its type is: T :: TYPE R Cannot unify ‘R’ with the type variable ‘c0’ because the former is not a concrete ‘RuntimeRep’. With this commit, we now omit the last two lines, because the concrete type variable (here 'c0') does not appear in the type displayed to the user (here 'T :: TYPE R'). - - - - - 6d058a69 by Andrea Bedini at 2025-05-21T16:00:51-04:00 Don't fail when ghcversion.h can't be found (#26018) If ghcversion.h can't be found, don't try to include it. This happens when there is no rts package in the package db and when -ghcversion-file argument isn't passed. Co-authored-by: Syvlain Henry <sylvain(a)haskus.fr> - - - - - b1212fbf by Vladislav Zavialov at 2025-05-21T16:01:33-04:00 Implement -Wpattern-namespace-specifier (#25900) In accordance with GHC Proposal #581 "Namespace-specified imports", section 2.3 "Deprecate use of pattern in import/export lists", the `pattern` namespace specifier is now deprecated. Test cases: T25900 T25900_noext - - - - - e650ec3e by Ben Gamari at 2025-05-23T03:42:46-04:00 base: Forward port changelog language from 9.12 - - - - - 94cd9ca4 by Ben Gamari at 2025-05-23T03:42:46-04:00 base: Fix RestructuredText-isms in changelog - - - - - 7722232c by Ben Gamari at 2025-05-23T03:42:46-04:00 base: Note strictness changes made in 4.16.0.0 Addresses #25886. - - - - - 3f4b823c by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker: Factor out ProddableBlocks machinery - - - - - 6e23fef2 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker: Improve efficiency of proddable blocks structure Previously the linker's "proddable blocks" check relied on a simple linked list of spans. This resulted in extremely poor complexity while linking objects with lots of small sections (e.g. objects built with split sections). Rework the mechanism to instead use a simple interval set implemented via binary search. Fixes #26009. - - - - - ea74860c by Ben Gamari at 2025-05-23T03:43:28-04:00 testsuite: Add simple functional test for ProddableBlockSet - - - - - 74c4db46 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker/PEi386: Drop check for LOAD_LIBRARY_SEARCH_*_DIRS The `LOAD_LIBRARY_SEARCH_USER_DIRS` and `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS` were introduced in Windows Vista and have been available every since. As we no longer support Windows XP we can drop this check. Addresses #26009. - - - - - 972d81d6 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker/PEi386: Clean up code style - - - - - 8a1073a5 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/Hash: Factor out hashBuffer This is a useful helper which can be used for non-strings as well. - - - - - 44f509f2 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker/PEi386: Fix incorrect use of break in nested for Previously the happy path of PEi386 used `break` in a double-`for` loop resulting in redundant calls to `LoadLibraryEx`. Fixes #26052. - - - - - bfb12783 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts: Correctly mark const arguments - - - - - 08469ff8 by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker/PEi386: Don't repeatedly load DLLs Previously every DLL-imported symbol would result in a call to `LoadLibraryEx`. This ended up constituting over 40% of the runtime of `ghc --interactive -e 42` on Windows. Avoid this by maintaining a hash-set of loaded DLL names, skipping the call if we have already loaded the requested DLL. Addresses #26009. - - - - - 823d1ccf by Ben Gamari at 2025-05-23T03:43:28-04:00 rts/linker: Expand comment describing ProddableBlockSet - - - - - e9de9e0b by Sylvain Henry at 2025-05-23T15:12:34-04:00 Remove emptyModBreaks Remove emptyModBreaks and track the absence of ModBreaks with `Maybe ModBreaks`. It avoids testing for null pointers... - - - - - 17db44c5 by Ben Gamari at 2025-05-23T15:13:16-04:00 base: Expose Backtraces constructor and fields This was specified in the proposal (CLC #199) yet somehow didn't make it into the implementation. Fixes #26049. - - - - - b08c08ae by soulomoon at 2025-05-28T01:57:23+08:00 Refactor handling of imported COMPLETE pragmas from the HPT Previously, we imported COMPLETE pragmas from all modules in the Home Package Table (HPT) during type checking. However, since !13675, there may be non-below modules in the HPT from the dependency tree that we do not want to import COMPLETE pragmas from. This refactor changes the way we handle COMPLETE pragmas from the HPT to only import them from modules that are "below" the current module in the HPT. - Add hugCompleteSigsBelow to filter COMPLETE pragmas from "below" modules in the HPT, mirroring hugRulesBelow. - Move responsibility for calling hugCompleteSigsBelow to tcRnImports, storing the result in the new tcg_complete_match_env field of TcGblEnv. - Update getCompleteMatchesTcM to use tcg_complete_match_env. This refactor only affects how COMPLETE pragmas are imported from the HPT, imports from external packages are unchanged. - - - - - 16014bf8 by Hécate Kleidukos at 2025-05-28T20:09:34-04:00 Expose all of Backtraces' internals for ghc-internal Closes #26049 - - - - - a0adc30d by Ryan Hendrickson at 2025-05-30T14:12:52-04:00 haddock: Fix links to type operators - - - - - 7b64697c by Mario Blažević at 2025-05-30T14:13:41-04:00 Introduce parenBreakableList and use it in ppHsContext - - - - - 5f213bff by fendor at 2025-06-02T09:16:24+02:00 Make GHCi commands compatible with multiple home units === Design We enable all GHCi features that were previously guarded by the `inMulti` option. GHCi supported multiple home units up to a certain degree for quite a while now. The supported feature set was limited, due to a design impasse: One of the home units must be "active", e.g., there must be one `HomeUnit` whose `UnitId` is "active" which is returned when calling ```haskell do hscActiveUnitId <$> getSession ``` This makes sense in a GHC session, since you are always compiling a particular Module, but it makes less intuitive sense in an interactive session. Given an expression to evaluate, we can't easily tell in which "context" the expression should be parsed, typechecked and evaluated. That's why initially, most of GHCi features, except for `:reload`ing were disabled if the GHCi session had more than one `HomeUnitEnv`. We lift this restriction, enabling all features of GHCi for the multiple home unit case. To do this, we fundamentally change the `HomeUnitEnv` graph to be multiple home unit first. Instead of differentiating the case were we have a single home unit and multiple, we now always set up a multiple home unit session that scales seamlessly to an arbitrary amount of home units. We introduce two new `HomeUnitEnv`s that are always added to the `HomeUnitGraph`. They are: The "interactive-ghci", called the `interactiveGhciUnit`, contains the same `DynFlags` that are used by the `InteractiveContext` for interactive evaluation of expressions. This `HomeUnitEnv` is only used on the prompt of GHCi, so we may refer to it as "interactive-prompt" unit. See Note [Relation between the `InteractiveContext` and `interactiveGhciUnitId`] for discussing its role. And the "interactive-session"", called `interactiveSessionUnit` or `interactiveSessionUnitId`, which is used for loading Scripts into GHCi that are not `Target`s of any home unit, via `:load` or `:add`. Both of these "interactive" home units depend on all other `HomeUnitEnv`s that are passed as arguments on the cli. Additionally, the "interactive-ghci" unit depends on `interactive-session`. We always evaluate expressions in the context of the "interactive-ghci" session. Since "interactive-ghci" depends on all home units, we can import any `Module` from the other home units with ease. As we have a clear `HomeUnitGraph` hierarchy, we can set `interactiveGhciUnitId` as the active home unit for the full duration of the GHCi session. In GHCi, we always set `interactiveGhciUnitId` to be the currently active home unit. === Implementation Details Given this design idea, the implementation is relatively straight forward. The core insight is that a `ModuleName` is not sufficient to identify a `Module` in the `HomeUnitGraph`. Thus, large parts of the PR is simply about refactoring usages of `ModuleName` to prefer `Module`, which has a `Unit` attached and is unique over the `HomeUnitGraph`. Consequentially, most usages of `lookupHPT` are likely to be incorrect and have been replaced by `lookupHugByModule` which is keyed by a `Module`. In `GHCi/UI.hs`, we make sure there is only one location where we are actually translating `ModuleName` to a `Module`: * `lookupQualifiedModuleName` If a `ModuleName` is ambiguous, we detect this and report it to the user. To avoid repeated lookups of `ModuleName`s, we store the `Module` in the `InteractiveImport`, which additionally simplifies the interface loading. A subtle detail is that the `DynFlags` of the `InteractiveContext` are now stored both in the `HomeUnitGraph` and in the `InteractiveContext`. In UI.hs, there are multiple code paths where we are careful to update the `DynFlags` in both locations. Most importantly in `addToProgramDynFlags`. --- There is one metric increase in this commit: ------------------------- Metric Increase: T4029 ------------------------- It is an increase from 14.4 MB to 16.1 MB (+11.8%) which sounds like a pretty big regression at first. However, we argue this increase is solely caused by using more data structures for managing multiple home units in the GHCi session. In particular, due to the design decision of using three home units, the base memory usage increases... but by how much? A big contributor is the `UnitState`, of which we have three now, which on its own 260 KB per instance. That makes an additional memory usage of 520 KB, already explaining a third of the overall memory usage increase. Then we store more elements in the `HomeUnitGraph`, we have more `HomeUnitEnv` entries, etc... While we didn't chase down each byte, we looked at the memory usage over time for both `-hi` and `-hT` profiles and can say with confidence while the memory usage increased slightly, we did not introduce any space leak, as the graph looks almost identical as the memory usage graph of GHC HEAD. --- Adds testcases for GHCi multiple home units session * Test truly multiple home unit sessions, testing reload logic and code evaluation. * Test that GHCi commands such as `:all-types`, `:browse`, etc., work * Object code reloading for home modules * GHCi debugger multiple home units session - - - - - de603d01 by fendor at 2025-06-02T09:16:24+02:00 Update "loading compiled code" GHCi documentation To use object code in GHCi, the module needs to be compiled for use in GHCi. To do that, users need to compile their modules with: * `-dynamic` * `-this-unit-id interactive-session` Otherwise, the interface files will not match. - - - - - b255a8ca by Vladislav Zavialov at 2025-06-02T16:00:12-04:00 docs: Fix code example for NoListTuplePuns Without the fix, the example produces an error: Test.hs:11:3: error: [GHC-45219] • Data constructor ‘Tuple’ returns type ‘Tuple2 a b’ instead of an instance of its parent type ‘Tuple a’ • In the definition of data constructor ‘Tuple’ In the data type declaration for ‘Tuple’ Fortunately, a one line change makes it compile. - - - - - 6558467c by Ryan Hendrickson at 2025-06-06T05:46:58-04:00 haddock: Parse math even after ordinary characters Fixes a bug where math sections were not recognized if preceded by a character that isn't special (like space or a markup character). - - - - - 265d0024 by ARATA Mizuki at 2025-06-06T05:47:48-04:00 AArch64 NCG: Fix sub-word arithmetic right shift As noted in Note [Signed arithmetic on AArch64], we should zero-extend sub-word values. Fixes #26061 - - - - - 05e9be18 by Simon Hengel at 2025-06-06T05:48:35-04:00 Allow Unicode in "message" and "hints" with -fdiagnostics-as-json (fixes #26075) - - - - - bfa6b70f by ARATA Mizuki at 2025-06-06T05:49:24-04:00 x86 NCG: Fix code generation of bswap64 on i386 Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> Fix #25601 - - - - - 35826d8b by Matthew Pickering at 2025-06-08T22:00:41+01:00 Hadrian: Add option to generate .hie files for stage1 libraries The +hie_files flavour transformer can be enabled to produce hie files for stage1 libraries. The hie files are produced in the "extra-compilation-artifacts" folder and copied into the resulting bindist. At the moment the hie files are not produced for the release flavour, they add about 170M to the final bindist. Towards #16901 - - - - - e2467dbd by Ryan Hendrickson at 2025-06-09T13:07:05-04:00 Fix various failures to -fprint-unicode-syntax - - - - - 1d99d3e4 by maralorn at 2025-06-12T03:47:39-04:00 Add necessary flag for js linking - - - - - 974d5734 by maralorn at 2025-06-12T03:47:39-04:00 Don’t use additional linker flags to detect presence of -fno-pie in configure.ac This mirrors the behavior of ghc-toolchain - - - - - 1e9eb118 by Andrew Lelechenko at 2025-06-12T03:48:21-04:00 Add HasCallStack to Control.Monad.Fail.fail CLC proposal https://github.com/haskell/core-libraries-committee/issues/327 2% compile-time allocations increase in T3064, likely because `fail` is now marginally more expensive to compile. Metric Increase: T3064 - - - - - 6d12060f by meooow25 at 2025-06-12T14:26:07-04:00 Bump containers submodule to 0.8 Also * Disable -Wunused-imports for containers * Allow containers-0.8 for in-tree packages * Bump some submodules so that they allow containers-0.8. These are not at any particular versions. * Remove unused deps containers and split from ucd2haskell * Fix tests affected by the new containers and hpc-bin - - - - - 537bd233 by Peng Fan at 2025-06-12T14:27:02-04:00 NCG/LA64: Optimize code generation and reduce build-directory size. 1. makeFarBranches: Prioritize fewer instruction sequences. 2. Prefer instructions with immediate numbers to reduce register moves, e.g. andi,ori,xori,addi. 3. Ppr: Remove unnecessary judgments. 4. genJump: Avoid "ld+jr" as much as possible. 5. BCOND and BCOND1: Implement conditional jumps with two jump ranges, with limited choice of the shortest. 6. Implement FSQRT, CLT, CTZ. 7. Remove unnecessary code. - - - - - 19f20861 by Simon Peyton Jones at 2025-06-13T09:51:11-04:00 Improve redundant constraints for instance decls Addresses #25992, which showed that the default methods of an instance decl could make GHC fail to report redundant constraints. Figuring out how to do this led me to refactor the computation of redundant constraints. See the entirely rewritten Note [Tracking redundant constraints] in GHC.Tc.Solver.Solve - - - - - 1d02798e by Matthew Pickering at 2025-06-13T09:51:54-04:00 Refactor the treatment of nested Template Haskell splices * The difference between a normal splice, a quasiquoter and implicit splice caused by lifting is stored in the AST after renaming. * Information that the renamer learns about splices is stored in the relevant splice extension points (XUntypedSpliceExpr, XQuasiQuote). * Normal splices and quasi quotes record the flavour of splice (exp/pat/dec etc) * Implicit lifting stores information about why the lift was attempted, so if it fails, that can be reported to the user. * After renaming, the decision taken to attempt to implicitly lift a variable is stored in the `XXUntypedSplice` extension field in the `HsImplicitLiftSplice` constructor. * Since all the information is stored in the AST, in `HsUntypedSplice`, the type of `PendingRnSplice` now just stores a `HsUntypedSplice`. * Error messages since the original program can be easily printed, this is noticeable in the case of implicit lifting. * The user-written syntax is directly type-checked. Before, some desugaring took place in the * Fixes .hie files to work better with nested splices (nested splices are not indexed) * The location of the quoter in a quasiquote is now located, so error messages will precisely point to it (and again, it is indexed by hie files) In the future, the typechecked AST should also retain information about the splices and the specific desugaring being left to the desugarer. Also, `runRnSplice` should call `tcUntypedSplice`, otherwise the typechecking logic is duplicated (see the `QQError` and `QQTopError` tests for a difference caused by this). - - - - - f93798ba by Cheng Shao at 2025-06-13T09:52:35-04:00 libffi: update to 3.5.1 Bumps libffi submodule. - - - - - c7aa0c10 by Andreas Klebinger at 2025-06-15T05:47:24-04:00 Revert "Specialise: Don't float out constraint components." This reverts commit c9abb87ccc0c91cd94f42b3e36270158398326ef. Turns out two benchmarks from #19747 regresses by a factor of 7-8x if we do not float those out. - - - - - fd998679 by Krzysztof Gogolewski at 2025-06-15T05:48:06-04:00 Fix EPT enforcement when mixing unboxed tuples and non-tuples The code was assuming that an alternative cannot be returning a normal datacon and an unboxed tuple at the same time. However, as seen in #26107, this can happen when using a GADT to refine the representation type. The solution is just to conservatively return TagDunno. - - - - - e64b3f16 by ARATA Mizuki at 2025-06-17T10:13:42+09:00 MachRegs.h: Don't define NO_ARG_REGS when a XMM register is defined On i386, MAX_REAL_VANILLA_REG is 1, but MAX_REAL_XMM_REG is 4. If we define NO_ARG_REGS on i386, programs that use SIMD vectors may segfault. Closes #25985 A couple of notes on the BROKEN_TESTS field: * This fixes the segfault from T25062_V16. * The failure from T22187_run was fixed in an earlier commit (see #25561), but BROKEN_TESTS was missed at that time. Now should be a good time to mark it fixed. - - - - - 3e7c6b4d by Matthew Pickering at 2025-06-18T15:34:04-04:00 Improve error messages when implicit lifting fails This patch concerns programs which automatically try to fix level errors by inserting `Lift`. For example: ``` foo x = [| x |] ~> foo x = [| $(lift x) |] ``` Before, there were two problems with the message. 1. (#26031), the location of the error was reported as the whole quotation. 2. (#26035), the message just mentions there is no Lift instance, but gives no indicate why the user program needed a Lift instance in the first place. This problem is especially bad when you disable `ImplicitStagePersistence`, so you just end up with a confusing "No instance for" message rather than an error message about levels This patch fixes both these issues. Firstly, `PendingRnSplice` differentiates between a user-written splice and an implicit lift. Then, the Lift instance is precisely requested with a specific origin in the typechecker. If the instance fails to be solved, the message is reported using the `TcRnBadlyLevelled` constructor (like a normal level error). Fixes #26031, #26035 - - - - - 44b8cee2 by Cheng Shao at 2025-06-18T15:34:46-04:00 testsuite: add T26120 marked as broken - - - - - 894a04f3 by Cheng Shao at 2025-06-18T15:34:46-04:00 compiler: fix GHC.SysTools.Ar archive member size writing logic This patch fixes a long-standing bug in `GHC.SysTools.Ar` that emits the wrong archive member size in each archive header. It should encode the exact length of the member payload, excluding any padding byte, otherwise malformed archive that extracts a broken object with an extra trailing byte could be created. Apart from the in-tree `T26120` test, I've also created an out-of-tree testsuite at https://github.com/TerrorJack/ghc-ar-quickcheck that contains QuickCheck roundtrip tests for `GHC.SysTools.Ar`. With this fix, simple roundtrip tests and `writeGNUAr`/GNU `ar` roundtrip test passes. There might be more bugs lurking in here, but this patch is still a critical bugfix already. Fixes #26120 #22586. Co-authored-by: Codex <codex(a)openai.com> - - - - - f677ab5f by Lauren Yim at 2025-06-18T15:35:37-04:00 fix some typos in the warnings page in the user guide - - - - - b968e1c1 by Rodrigo Mesquita at 2025-06-18T15:36:18-04:00 Add a frozen callstack to throwGhcException Fixes #25956 - - - - - a5e0c3a3 by fendor at 2025-06-18T15:36:59-04:00 Update using.rst to advertise full mhu support for GHCi - - - - - d3e60e97 by Ryan Scott at 2025-06-18T22:29:21-04:00 Deprecate -Wdata-kinds-tc, make DataKinds issues in typechecker become errors !11314 introduced the `-Wdata-kinds-tc` warning as part of a fix for #22141. This was a temporary stopgap measure to allow users who were accidentally relying on code which needed the `DataKinds` extension in order to typecheck without having to explicitly enable the extension. Now that some amount of time has passed, this patch deprecates `-Wdata-kinds-tc` and upgrades any `DataKinds`-related issues in the typechecker (which were previously warnings) into errors. - - - - - fd5b5177 by Ryan Hendrickson at 2025-06-18T22:30:06-04:00 haddock: Add redact-type-synonyms pragma `{-# OPTIONS_HADDOCK redact-type-synonyms #-}` pragma will hide the RHS of type synonyms, and display the result kind instead, if the RHS contains any unexported types. - - - - - fbc0b92a by Vladislav Zavialov at 2025-06-22T04:25:16+03:00 Visible forall in GADTs (#25127) Add support for visible dependent quantification `forall a -> t` in types of data constructors, e.g. data KindVal a where K :: forall k. forall (a::k) -> -- now allowed! k -> KindVal a For details, see docs/users_guide/exts/required_type_arguments.rst, which has gained a new subsection. DataCon in compiler/GHC/Core/DataCon.hs --------------------------------------- The main change in this patch is that DataCon, the Core representation of a data constructor, now uses a different type to store user-written type variable binders: - dcUserTyVarBinders :: [InvisTVBinder] + dcUserTyVarBinders :: [TyVarBinder] where type TyVarBinder = VarBndr TyVar ForAllTyFlag type InvisTVBinder = VarBndr TyVar Specificity and data Specificity = InferredSpec | SpecifiedSpec data ForAllTyFlag = Invisible Specificity | Required This change necessitates some boring, mechanical changes scattered throughout the diff: ... is now used in place of ... -----------------+--------------- TyVarBinder | InvisTVBinder IfaceForAllBndr | IfaceForAllSpecBndr Specified | SpecifiedSpec Inferred | InferredSpec mkForAllTys | mkInvisForAllTys additionally, tyVarSpecToBinders -- added or removed calls ifaceForAllSpecToBndrs -- removed calls Visibility casts in mkDataConRep -------------------------------- Type abstractions in Core (/\a. e) always have type (forall a. t) because coreTyLamForAllTyFlag = Specified. This is also true of data constructor workers. So we may be faced with the following: data con worker: (forall a. blah) data con wrapper: (forall a -> blah) In this case the wrapper must use a visibility cast (e |> ForAllCo ...) with appropriately set fco_vis{L,R}. Relevant functions: mkDataConRep in compiler/GHC/Types/Id/Make.hs dataConUserTyVarBindersNeedWrapper in compiler/GHC/Core/DataCon.hs mkForAllVisCos in compiler/GHC/Core/Coercion.hs mkCoreTyLams in compiler/GHC/Core/Make.hs mkWpForAllCast in compiler/GHC/Tc/Types/Evidence.hs More specifically: - dataConUserTyVarBindersNeedWrapper has been updated to answer "yes" if there are visible foralls in the type of the data constructor. - mkDataConRep now uses mkCoreTyLams to generate the big lambda abstractions (/\a b c. e) in the data con wrapper. - mkCoreTyLams is a variant of mkCoreLams that applies visibility casts as needed. It similar in purpose to the pre-existing mkWpForAllCast, so the common bits have been factored out into mkForAllVisCos. ConDecl in compiler/Language/Haskell/Syntax/Decls.hs ---------------------------------------------------- The surface syntax representation of a data constructor declaration is ConDecl. In accordance with the proposal, only GADT syntax is extended with support for visible forall, so we are interested in ConDeclGADT. ConDeclGADT's field con_bndrs has been renamed to con_outer_bndrs and is now accompanied by con_inner_bndrs: con_outer_bndrs :: XRec pass (HsOuterSigTyVarBndrs pass) con_inner_bndrs :: [HsForAllTelescope pass] Visible foralls always end up in con_inner_bndrs. The outer binders are stored and processed separately to support implicit quantification and the forall-or-nothing rule, a design established by HsSigType. A side effect of this change is that even in absence of visible foralls, GHC now permits multiple invisible foralls, e.g. data T a where { MkT :: forall a b. forall c d. ... -> T a } But of course, this is done in service of making at least some of these foralls visible. The entire compiler front-end has been updated to deal with con_inner_bndrs. See the following modified or added functions: Parser: mkGadtDecl in compiler/GHC/Parser/PostProcess.hs splitLHsGadtTy in compiler/GHC/Hs/Type.hs Pretty-printer: pprConDecl in compiler/GHC/Hs/Decls.hs pprHsForAllTelescope in compiler/GHC/Hs/Type.hs Renamer: rnConDecl in compiler/GHC/Rename/Module.hs bindHsForAllTelescopes in compiler/GHC/Rename/HsType.hs extractHsForAllTelescopes in compiler/GHC/Rename/HsType.hs Type checker: tcConDecl in compiler/GHC/Tc/TyCl.hs tcGadtConTyVarBndrs in compiler/GHC/Tc/Gen/HsType.hs Template Haskell ---------------- The TH AST is left unchanged for the moment to avoid breakage. An attempt to quote or reify a data constructor declaration with visible forall in its type will result an error: data ThRejectionReason -- in GHC/HsToCore/Errors/Types.hs = ... | ThDataConVisibleForall -- new error constructor However, as noted in the previous section, GHC now permits multiple invisible foralls, and TH was updated accordingly. Updated code: repC in compiler/GHC/HsToCore/Quote.hs reifyDataCon in compiler/GHC/Tc/Gen/Splice.hs ppr @Con in libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs Pattern matching ---------------- Everything described above concerns data constructor declarations, but what about their use sites? Now it is trickier to type check a pattern match fn(Con a b c)=... because we can no longer assume that a,b,c are all value arguments. Indeed, some or all of them may very well turn out to be required type arguments. To that end, see the changes to: tcDataConPat in compiler/GHC/Tc/Gen/Pat.hs splitConTyArgs in compiler/GHC/Tc/Gen/Pat.hs and the new helpers split_con_ty_args, zip_pats_bndrs. This is also the reason the TcRnTooManyTyArgsInConPattern error constructor has been removed. The new code emits TcRnArityMismatch or TcRnIllegalInvisibleTypePattern. Summary ------- DataCon, ConDecl, as well as all related functions have been updated to support required type arguments in data constructors. Test cases: HieGadtConSigs GadtConSigs_th_dump1 GadtConSigs_th_pprint1 T25127_data T25127_data_inst T25127_infix T25127_newtype T25127_fail_th_quote T25127_fail_arity TyAppPat_Tricky Co-authored-by: mniip <mniip(a)mniip.com> - - - - - ae003a3a by Teo Camarasu at 2025-06-23T05:21:48-04:00 linters: lint-whitespace: bump upper-bound for containers The version of containers was bumped in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13989 - - - - - 0fb37893 by Matthew Pickering at 2025-06-23T13:55:10-04:00 Move ModuleGraph into UnitEnv The ModuleGraph is a piece of information associated with the ExternalPackageState and HomeUnitGraph. Therefore we should store it inside the HomeUnitEnv. - - - - - 3bf6720e by soulomoon at 2025-06-23T13:55:52-04:00 Remove hptAllFamInstances usage during upsweep Fixes #26118 This change eliminates the use of hptAllFamInstances during the upsweep phase, as it could access non-below modules from the home package table. The following updates were made: * Updated checkFamInstConsistency to accept an explicit ModuleEnv FamInstEnv parameter and removed the call to hptAllFamInstances. * Adjusted hugInstancesBelow so we can construct ModuleEnv FamInstEnv from its result, * hptAllFamInstances and allFamInstances functions are removed. - - - - - 83ee7b78 by Ben Gamari at 2025-06-24T05:02:07-04:00 configure: Don't force value of OTOOL, etc. if not present Previously if `otool` and `install_name_tool` were not present they would be overridden by `fp_settings.m4`. This logic was introduced in 4ff93292243888545da452ea4d4c1987f2343591 without explanation. - - - - - 9329c9e1 by Ben Gamari at 2025-06-24T05:02:07-04:00 ghc-toolchain: Add support for otool, install_name_tool Fixes part of ghc#23675. - - - - - 25f5c998 by Ben Gamari at 2025-06-24T05:02:08-04:00 ghc-toolchain: Add support for llc, opt, llvm-as Fixes #23675. - - - - - 51d150dd by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00 hadrian: Use settings-use-distro-mingw directly The type `ToolchainSetting` only made sense when we had more settings to fetch from the system config file. Even then "settings-use-distro-mingw" is arguably not a toolchain setting. With the fix for #23675, all toolchain tools were moved to the `ghc-toolchain` `Toolchain` format. Therefore, we can inline `settings-use-distro-mingw` accesses and delete `ToolchainSetting`. - - - - - dcf68a83 by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00 configure: Check LlvmTarget exists for LlvmAsFlags If LlvmTarget was empty, LlvmAsFlags would be just "--target=". If it is empty now, simply keep LlvmAsFlags empty. ghc-toolchain already does this right. This fix makes the two configurations match up. - - - - - 580a3353 by Ben Gamari at 2025-06-24T05:02:51-04:00 rts/linker/LoadArchive: Use bool Improve type precision by using `bool` instead of `int` and `StgBool`. - - - - - 76d1041d by Ben Gamari at 2025-06-24T05:02:51-04:00 rts/linker/LoadArchive: Don't rely on file extensions for identification Previously archive members would be identified via their file extension, as described in #13103. We now instead use a more principled approach, relying on the magic number in the member's header. As well, we refactor treatment of archive format detection to improve code clarity and error handling. Closes #13103. - - - - - 4b748a99 by Teo Camarasu at 2025-06-24T15:31:07-04:00 template-haskell: improve changelog stable -> more stable, just to clarify that this interface isn't fully stable. errornously -> mistakenly: I typod this and also let's go for a simpler word - - - - - e358e477 by Sylvain Henry at 2025-06-24T15:31:58-04:00 Bump stack resolver to use GHC 9.6.7 Cf #26139 - - - - - 4bf5eb63 by fendor at 2025-06-25T17:05:43-04:00 Teach `:reload` about multiple home units `:reload` needs to lookup the `ModuleName` and must not assume the given `ModuleName` is in the current `HomeUnit`. We add a new utility function which allows us to find a `HomeUnitModule` instead of a `Module`. Further, we introduce the `GhciCommandError` type which can be used to abort the execution of a GHCi command. This error is caught and printed in a human readable fashion. - - - - - b3d97bb3 by fendor at 2025-06-25T17:06:25-04:00 Implement `-fno-load-initial-targets` flag We add the new flag `-fno-load-initial-targets` which doesn't load all `Target`s immediately but only computes the module graph for all `Target`s. The user can then decide to load modules from that module graph using the syntax: ghci> :reload <Mod> This will load everything in the module graph up to `Mod`. The user can return to the initial state by using the builtin target `none` to unload all modules. ghci> :reload none Is in principle identical to starting a new session with the `-fno-load-initial-targets` flag. The `-fno-load-initial-targets` flag allows for faster startup time of GHCi when a user has lots of `Target`s. We additionally extend the `:reload` command to accept multiple `ModuleName`s. For example: ghci> :reload <Mod1> <Mod2> Loads all modules up to the modules `Mod1` and `Mod2`. - - - - - 49f44e52 by Teo Camarasu at 2025-06-26T04:19:51-04:00 Expose ghc-internal unit id through the settings file This in combination with the unit id of the compiler library allows cabal to know of the two unit ids that should not be reinstalled (in specific circumstances) as: - when using plugins, we want to link against exactly the compiler unit id - when using TemplateHaskell we want to link against exactly the package that contains the TemplateHaskell interfaces, which is `ghc-internal` See: <https://github.com/haskell/cabal/issues/10087> Resolves #25282 - - - - - 499c4efe by Bryan Richter at 2025-06-26T04:20:33-04:00 CI: Fix and clean up capture of timings * Fixes the typo that caused 'cat ci-timings' to report "no such file or directory" * Gave ci_timings.txt a file extension so it may play better with other systems * Fixed the use of time_it so all times are recorded * Fixed time_it to print name along with timing - - - - - 86c90c9e by Bryan Richter at 2025-06-26T04:20:33-04:00 CI: Update collapsible section usage The syntax apparently changed at some point. - - - - - 04308ee4 by Bryan Richter at 2025-06-26T04:20:33-04:00 CI: Add more collapsible sections - - - - - 43b606bb by Florian Ragwitz at 2025-06-27T16:31:26-04:00 Tick uses of wildcard/pun field binds as if using the record selector function Fixes #17834. See Note [Record-selector ticks] for additional reasoning behind this as well as an overview of the implementation details and future improvements. - - - - - d4952549 by Ben Gamari at 2025-06-27T16:32:08-04:00 testsuite/caller-cc: Make CallerCc[123] less sensitive These were previously sensitive to irrelevant changes in program structure. To avoid this we filter out all by lines emitted by the -fcaller-cc from the profile. - - - - - 8d33d048 by Berk Özkütük at 2025-07-07T20:42:20-04:00 Consider `PromotedDataCon` in `tyConStupidTheta` Haddock checks data declarations for the stupid theta so as not to pretty-print them as empty contexts. Type data declarations end up as `PromotedDataCon`s by the time Haddock performs this check, causing a panic. This commit extends `tyConStupidTheta` so that it returns an empty list for `PromotedDataCon`s. This decision was guided by the fact that type data declarations never have data type contexts (see (R1) in Note [Type data declarations]). Fixes #25739. - - - - - a26243fd by Ryan Hendrickson at 2025-07-07T20:43:07-04:00 haddock: Document instances from other packages When attaching instances to `Interface`s, it isn't enough just to look for instances in the list of `Interface`s being processed. We also need to look in the modules on which they depend, including those outside of this package. Fixes #25147. Fixes #26079. - - - - - 0fb24420 by Rodrigo Mesquita at 2025-07-07T20:43:49-04:00 hadrian: Fallback logic for internal interpreter When determining whether to build the internal interpreter, the `make` build system had a fallback case for platforms not in the list of explicitly-supported operating systems and architectures. This fallback says we should try to build the internal interpreter if building dynamic GHC programs (if the architecture is unknown). Fixes #24098 - - - - - fe925bd4 by Ben Gamari at 2025-07-07T20:44:30-04:00 users-guide: Reference Wasm FFI section - - - - - 5856284b by Ben Gamari at 2025-07-07T20:44:30-04:00 users-guide: Fix too-short heading warning - - - - - a48dcdf3 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Reorganise documentation for allocate* functions Consolodate interface information into the .h file, keeping just implementation details in the .c file. Use Notes stlye in the .h file and refer to notes from the .c file. - - - - - de5b528c by Duncan Coutts at 2025-07-07T20:45:18-04:00 Introduce common utilities for allocating arrays The intention is to share code among the several places that do this already. - - - - - b321319d by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Heap.c The CMM primop can now report heap overflow. - - - - - 1d557ffb by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in ThreadLabels.c Replacing a local utility. - - - - - e59a1430 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Threads.c Replacing local open coded version. - - - - - 482df1c9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Add exitHeapOverflow helper utility This will be useful with the array alloc functions, since unlike allocate/allocateMaybeFail, they do not come in two versions. So if it's not convenient to propagate failure, then one can use this. - - - - - 4d3ec8f9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Weak.c Also add a cpp macro CCS_SYSTEM_OR_NULL which does what it says. The benefit of this is that it allows us to referece CCS_SYSTEM even when we're not in PROFILING mode. That makes abstracting over profiling vs normal mode a lot easier. - - - - - 0c4f2fde by Duncan Coutts at 2025-07-07T20:45:18-04:00 Convert the array alloc primops to use the new array alloc utils - - - - - a3354ad9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 While we're at it, add one missing 'likely' hint To a cmm primops that raises an exception, like the others now do. - - - - - 33b546bd by meooow25 at 2025-07-07T20:46:09-04:00 Keep scanl' strict in the head on rewrite `scanl'` forces elements to WHNF when the corresponding `(:)`s are forced. The rewrite rule for `scanl'` missed forcing the first element, which is fixed here with a `seq`. - - - - - 8a69196e by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger/rts: Allow toggling step-in per thread The RTS global flag `rts_stop_next_breakpoint` globally sets the interpreter to stop at the immediate next breakpoint. With this commit, single step mode can additionally be set per thread in the TSO flag (TSO_STOP_NEXT_BREAKPOINT). Being able to toggle "stop at next breakpoint" per thread is an important requirement for implementing "stepping out" of a function in a multi-threaded context. And, more generally, having a per-thread flag for single-stepping paves the way for multi-threaded debugging. That said, when we want to enable "single step" mode for the whole interpreted program we still want to stop at the immediate next breakpoint, whichever thread it belongs to. That's why we also keep the global `rts_stop_next_breakpoint` flag, with `rts_enableStopNextBreakpointAll` and `rts_disableStopNextBreakpointAll` helpers. Preparation for #26042 - - - - - 73d3f864 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 docs: Case continuation BCOs This commit documents a subtle interaction between frames for case BCOs and their parents frames. Namely, case continuation BCOs may refer to (non-local) variables that are part of the parent's frame. The note expanding a bit on these details is called [Case continuation BCOs] - - - - - d7aeddcf by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger: Implement step-out feature Implements support for stepping-out of a function (aka breaking right after returning from a function) in the interactive debugger. It also introduces a GHCi command :stepout to step-out of a function being debugged in the interpreter. The feature is described as: Stop at the first breakpoint immediately after returning from the current function scope. Known limitations: because a function tail-call does not push a stack frame, if step-out is used inside of a function that was tail-called, execution will not be returned to its caller, but rather its caller's first non-tail caller. On the other hand, it means the debugger follows the more realistic execution of the program. In the following example: .. code-block:: none f = do a b <--- (1) set breakpoint then step in here c b = do ... d <--- (2) step-into this tail call d = do ... something <--- (3) step-out here ... Stepping-out will stop execution at the `c` invokation in `f`, rather than stopping at `b`. The key idea is simple: When step-out is enabled, traverse the runtime stack until a continuation BCO is found -- and enable the breakpoint heading that BCO explicitly using its tick-index. The details are specified in `Note [Debugger: Step-out]` in `rts/Interpreter.c`. Since PUSH_ALTS BCOs (representing case continuations) were never headed by a breakpoint (unlike the case alternatives they push), we introduced the BRK_ALTS instruction to allow the debugger to set a case continuation to stop at the breakpoint heading the alternative that is taken. This is further described in `Note [Debugger: BRK_ALTS]`. Fixes #26042 - - - - - 5d9adf51 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger: Filter step-out stops by SrcSpan To implement step-out, the RTS looks for the first continuation frame on the stack and explicitly enables its entry breakpoint. However, some continuations will be contained in the function from which step-out was initiated (trivial example is a case expression). Similarly to steplocal, we will filter the breakpoints at which the RTS yields to the debugger based on the SrcSpan. When doing step-out, only stop if the breakpoint is /not/ contained in the function from which we initiated it. This is especially relevant in monadic statements such as IO which is compiled to a long chain of case expressions. See Note [Debugger: Filtering step-out stops] - - - - - 7677adcc by Cheng Shao at 2025-07-08T07:40:29-04:00 compiler: make ModBreaks serializable - - - - - 14f67c6d by Rodrigo Mesquita at 2025-07-08T07:40:29-04:00 refactor: "Inspecting the session" moved from GHC Moved utilities for inspecting the session from the GHC module to GHC.Driver.Session.Inspect Purely a clean up - - - - - 9d3f484a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Pass the HUG to readModBreaks, not HscEnv A minor cleanup. The associated history and setupBreakpoint functions are changed accordingly. - - - - - b595f713 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Move readModBreaks to GHC.Runtime.Interpreter With some small docs changes - - - - - d223227a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Move interpreterProfiled to Interp.Types Moves interpreterProfiled and interpreterDynamic to GHC.Runtime.Interpreter.Types from GHC.Runtime.Interpreter. - - - - - 7fdd0a3d by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Don't import GHC in Debugger.Breakpoints Remove the top-level import GHC from GHC.Runtime.Debugger.Breakpoints This makes the module dependencies more granular and cleans up the qualified imports from the code. - - - - - 5e4da31b by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 refactor: Use BreakpointId in Core and Ifaces - - - - - 741ac3a8 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 stg2bc: Derive BcM via ReaderT StateT A small refactor that simplifies GHC.StgToByteCode by deriving-via the Monad instances for BcM. This is done along the lines of previous similar refactors like 72b54c0760bbf85be1f73c1a364d4701e5720465. - - - - - 0414fcc9 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 refact: Split InternalModBreaks out of ModBreaks There are currently two competing ways of referring to a Breakpoint: 1. Using the Tick module + Tick index 2. Using the Info module + Info index 1. The Tick index is allocated during desugaring in `mkModBreaks`. It is used to refer to a breakpoint associated to a Core Tick. For a given Tick module, there are N Ticks indexed by Tick index. 2. The Info index is allocated during code generation (in StgToByteCode) and uniquely identifies the breakpoints at runtime (and is indeed used to determine which breakpoint was hit at runtime). Why we need both is described by Note [Breakpoint identifiers]. For every info index we used to keep a `CgBreakInfo`, a datatype containing information relevant to ByteCode Generation, in `ModBreaks`. This commit splits out the `IntMap CgBreakInfo` out of `ModBreaks` into a new datatype `InternalModBreaks`. - The purpose is to separate the `ModBreaks` datatype, which stores data associated from tick-level information which is fixed after desugaring, from the unrelated `IntMap CgBreakInfo` information accumulated during bytecode generation. - We move `ModBreaks` to GHC.HsToCore.Breakpoints The new `InternalModBreaks` simply combines the `IntMap CgBreakInfo` with `ModBreaks`. After code generation we construct an `InternalModBreaks` with the `CgBreakInfo`s we accumulated and the existing `ModBreaks` and store that in the compiled BCO in `bc_breaks`. - Note that we previously only updated the `modBreaks_breakInfo` field of `ModBreaks` at this exact location, and then stored the updated `ModBreaks` in the same `bc_breaks`. - We put this new datatype in GHC.ByteCode.Breakpoints The rest of the pipeline for which CgBreakInfo is relevant is accordingly updated to also use `InternalModBreaks` - - - - - 2a097955 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Use BreakpointIds in bytecode gen Small clean up to use BreakpointId and InternalBreakpointId more uniformly in bytecode generation rather than using Module + Ix pairs - - - - - 0515cc2f by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 ghci: Allocate BreakArrays at link time only Previously, a BreakArray would be allocated with a slot for every tick in a module at `mkModBreaks`, in HsToCore. However, this approach has a few downsides: - It interleaves interpreter behaviour (allocating arrays for breakpoints) within the desugarer - It is inflexible in the sense it is impossible for the bytecode generator to add "internal" breakpoints that can be triggered at runtime, because those wouldn't have a source tick. (This is relevant for our intended implementation plan of step-out in #26042) - It ties the BreakArray indices to the *tick* indexes, while at runtime we would rather just have the *info* indexes (currently we have both because BreakArrays are indexed by the *tick* one). Paving the way for #26042 and #26064, this commit moves the allocation of BreakArrays to bytecode-loading time -- akin to what is done for CCS arrays. Since a BreakArray is allocated only when bytecode is linked, if a breakpoint is set (e.g. `:break 10`) before the bytecode is linked, there will exist no BreakArray to trigger the breakpoint in. Therefore, the function to allocate break arrays (`allocateBreakArrays`) is exposed and also used in GHC.Runtime.Eval to allocate a break array when a breakpoint is set, if it doesn't exist yet (in the linker env). - - - - - 8016561f by Simon Peyton Jones at 2025-07-08T07:41:13-04:00 Add a test for T26176 - - - - - 454cd682 by Simon Peyton Jones at 2025-07-08T07:41:13-04:00 Add test for #14010 This test started to work in GHC 9.6 and has worked since. This MR just adds a regression test - - - - - ea2c6673 by Teo Camarasu at 2025-07-08T13:24:43-04:00 Implement user-defined allocation limit handlers Allocation Limits allow killing a thread if they allocate more than a user-specified limit. We extend this feature to allow more versatile behaviour. - We allow not killing the thread if the limit is exceeded. - We allow setting a custom handler to be called when the limit is exceeded. User-specified allocation limit handlers run in a fresh thread and are passed the ThreadId of the thread that exceeded its limit. We introduce utility functions for getting and setting the allocation limits of other threads, so that users can reset the limit of a thread from a handler. Both of these are somewhat coarse-grained as we are unaware of the allocations in the current nursery chunk. We provide several examples of usages in testsuite/tests/rts/T22859.hs Resolves #22859 - - - - - 03e047f9 by Simon Hengel at 2025-07-08T13:25:25-04:00 Fix typo in using.rst - - - - - 67957854 by Ben Gamari at 2025-07-09T09:44:44-04:00 compiler: Import AnnotationWrapper from ghc-internal Since `GHC.Desugar` exported from `base` has been deprecated. - - - - - 813d99d6 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-compact: Eliminate dependency on ghc-prim - - - - - 0ec952a1 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-heap: Eliminate dependency on ghc-prim - - - - - 480074c3 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-heap: Drop redundant import - - - - - 03455829 by Ben Gamari at 2025-07-09T09:44:45-04:00 ghc-prim: Bump version to 0.13.1 There are no interface changes from 0.13.0 but the implementation now lives in `ghc-internal`. - - - - - d315345a by Ben Gamari at 2025-07-09T09:44:45-04:00 template-haskell: Bump version number to 2.24.0.0 Bumps exceptions submodule. - - - - - 004c800e by Ben Gamari at 2025-07-09T09:44:45-04:00 Bump GHC version number to 9.14 - - - - - eb1a3816 by Ben Gamari at 2025-07-09T09:44:45-04:00 Bump parsec to 3.1.18.0 Bumps parsec submodule. - - - - - 86f83296 by Ben Gamari at 2025-07-09T09:44:45-04:00 unix: Bump to 2.8.7.0 Bumps unix submodule. - - - - - 89e13998 by Ben Gamari at 2025-07-09T09:44:45-04:00 binary: Bump to 0.8.9.3 Bumps binary submodule. - - - - - 55fff191 by Ben Gamari at 2025-07-09T09:44:45-04:00 Win32: Bump to 2.14.2.0 Bumps Win32 submodule. - - - - - 7dafa40c by Ben Gamari at 2025-07-09T09:44:45-04:00 base: Bump version to 4.22.0 Bumps various submodules. - - - - - ef03d8b8 by Rodrigo Mesquita at 2025-07-09T09:45:28-04:00 base: Export displayExceptionWithInfo This function should be exposed from base following CLC#285 Approved change in CLC#344 Fixes #26058 - - - - - 01d3154e by Wen Kokke at 2025-07-10T17:06:36+01:00 Fix documentation for HEAP_PROF_SAMPLE_STRING - - - - - ac259c48 by Wen Kokke at 2025-07-10T17:06:38+01:00 Fix documentation for HEAP_PROF_SAMPLE_COST_CENTRE - - - - - 2b4db9ba by Pi Delport at 2025-07-11T16:40:52-04:00 (Applicative docs typo: missing "one") - - - - - f707bab4 by Andreas Klebinger at 2025-07-12T14:56:16+01:00 Specialise: Improve specialisation by refactoring interestingDict This MR addresses #26051, which concerns missed type-class specialisation. The main payload of the MR is to completely refactor the key function `interestingDict` in GHC.Core.Opt.Specialise The main change is that we now also look at the structure of the dictionary we consider specializing on, rather than only the type. See the big `Note [Interesting dictionary arguments]` - - - - - ca7a9d42 by Simon Peyton Jones at 2025-07-12T14:56:16+01:00 Treat tuple dictionaries uniformly; don't unbox them See `Note [Do not unbox class dictionaries]` in DmdAnal.hs, sep (DNB1). This MR reverses the plan in #23398, which suggested a special case to unbox tuple dictionaries in worker/wrapper. But: - This was the cause of a pile of complexity in the specialiser (#26158) - Even with that complexity, specialision was still bad, very bad See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 And it's entirely unnecessary! Specialision works fine without unboxing tuple dictionaries. - - - - - be7296c9 by Andreas Klebinger at 2025-07-12T14:56:16+01:00 Remove complex special case from the type-class specialiser There was a pretty tricky special case in Specialise which is no longer necessary. * Historical Note [Floating dictionaries out of cases] * #26158 * #19747 https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 This MR removes it. Hooray. - - - - - 4acf3a86 by Ben Gamari at 2025-07-15T05:46:32-04:00 configure: bump version to 9.15 - - - - - 45efaf71 by Teo Camarasu at 2025-07-15T05:47:13-04:00 rts/nonmovingGC: remove n_free We remove the nonmovingHeap.n_free variable. We wanted this to track the length of nonmovingHeap.free. But this isn't possible to do atomically. When this isn't accurate we can get a segfault by going past the end of the list. Instead, we just count the length of the list when we grab it in nonmovingPruneFreeSegment. Resolves #26186 - - - - - c635f164 by Ben Gamari at 2025-07-15T14:05:54-04:00 configure: Drop probing of ld.gold As noted in #25716, `gold` has been dropped from binutils-2.44. Fixes #25716. Metric Increase: size_hello_artifact_gzip size_hello_unicode_gzip ghc_prim_so - - - - - 637bb538 by Ben Gamari at 2025-07-15T14:05:55-04:00 testsuite/recomp015: Ignore stderr This is necessary since ld.bfd complains that we don't have a .note.GNU-stack section, potentially resulting in an executable stack. - - - - - d3cd4ec8 by Wen Kokke at 2025-07-15T14:06:39-04:00 Fix documentation for heap profile ID - - - - - 73082769 by Ben Gamari at 2025-07-15T16:56:38-04:00 Bump win32-tarballs to v0.9 - - - - - 3b63b254 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/LoadArchive: Handle null terminated string tables As of `llvm-ar` now emits filename tables terminated with null characters instead of the usual POSIX `/\n` sequence. Fixes #26150. - - - - - 195f6527 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: rename label so name doesn't conflict with param - - - - - 63373b95 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Handle API set symbol versioning conflicts - - - - - 48e9aa3e by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Mark API set symbols as HIDDEN and correct symbol type - - - - - 959e827a by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Implement WEAK EXTERNAL undef redirection by target symbol name - - - - - 65f19293 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/LoadArchive: Handle string table entries terminated with / llvm-ar appears to terminate string table entries with `/\n` [1]. This matters in the case of thin archives, since the filename is used. In the past this worked since `llvm-ar` would produce archives with "small" filenames when possible. However, now it appears to always use the string table. [1] https://github.com/llvm/llvm-project/blob/bfb686bb5ba503e9386dc899e1ebbe248… - - - - - 9cbb3ef5 by Ben Gamari at 2025-07-15T16:56:39-04:00 testsuite: Mark T12497 as fixed Thanks to the LLVM toolchain update. Closes #22694. - - - - - 2854407e by Ben Gamari at 2025-07-15T16:56:39-04:00 testsuite: Accept new output of T11223_link_order_a_b_2_fail on Windows The archive member number changed due to the fact that llvm-ar now uses a string table. - - - - - 28439593 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/linker/PEi386: Implement IMAGE_REL_AMD64_SECREL This appears to now be used by libc++ as distributed by msys2. - - - - - 2b053755 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Cleanup merge resolution residue in lookupSymbolInDLL_PEi386 and make safe without dependent - - - - - e8acd2e7 by Wen Kokke at 2025-07-16T08:37:04-04:00 Remove the `profile_id` parameter from various RTS functions. Various RTS functions took a `profile_id` parameter, intended to be used to distinguish parallel heap profile breakdowns (e.g., `-hT` and `-hi`). However, this feature was never implemented and the `profile_id` parameter was set to 0 throughout the RTS. This commit removes the parameter but leaves the hardcoded profile ID in the functions that emit the encoded eventlog events as to not change the protocol. The affected functions are `traceHeapProfBegin`, `postHeapProfBegin`, `traceHeapProfSampleString`, `postHeapProfSampleString`, `traceHeapProfSampleCostCentre`, and `postHeapProfSampleCostCentre`. - - - - - 76d392a2 by Wen Kokke at 2025-07-16T08:37:04-04:00 Make `traceHeapProfBegin` an init event. - - - - - 6eb0a5de by Ben Gamari at 2025-07-22T09:19:37-04:00 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. - - - - - 82ce317e by Ben Gamari at 2025-07-22T09:20:13-04:00 testsuite: Mark T23146* as unbroken - - - - - 3297 changed files: - .gitattributes - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/common.sh - .gitlab/generate-ci/gen_ci.hs - .gitlab/hello.hs - .gitlab/jobs.yaml - .gitlab/merge_request_templates/Default.md - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - .gitlab/rel_eng/recompress-all - .gitlab/rel_eng/upload.sh - .gitlab/rel_eng/upload_ghc_libs.py - .gitmodules - boot - compile_flags.txt - compiler/CodeGen.Platform.h - compiler/GHC.hs - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/primops.txt.pp - 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 - 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− utils/hp2ps/hp2ps.wrapper - utils/hpc - utils/hsc2hs - − utils/iserv/Makefile - utils/iserv/cbits/iservmain.c - utils/iserv/iserv.cabal.in - utils/jsffi/dyld.mjs - utils/jsffi/post-link.mjs - utils/jsffi/prelude.mjs - utils/llvm-targets/gen-data-layout.sh - − utils/remote-iserv/Makefile - − utils/runghc/Makefile - − utils/runghc/runghc.wrapper - − utils/unlit/Makefile The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/2d806c856dc7747c663ffdfa88f4ec… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/2d806c856dc7747c663ffdfa88f4ec… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc] Pushed new branch wip/T26214
by Ben Gamari (＠bgamari) 22 Jul '25

22 Jul '25

Ben Gamari pushed new branch wip/T26214 at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/T26214 You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/romes/26202] Bump CI index-state
by Rodrigo Mesquita (＠alt-romes) 22 Jul '25

22 Jul '25

Rodrigo Mesquita pushed to branch wip/romes/26202 at Glasgow Haskell Compiler / GHC Commits: 39ed6aa5 by Rodrigo Mesquita at 2025-07-22T15:04:48+01:00 Bump CI index-state Necessary to fix cabal.project-reinstall - - - - - 3 changed files: - .gitlab/ci.sh - hadrian/cabal.project - utils/haddock/cabal.project 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="2025-07-15T16:39:57Z" MIN_HAPPY_VERSION="1.20" MIN_ALEX_VERSION="3.2.6" ===================================== hadrian/cabal.project ===================================== @@ -4,7 +4,7 @@ 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: 2025-07-15T16:39:57Z -- unordered-containers-0.2.20-r1 requires template-haskell < 2.22 -- ghc-9.10 has template-haskell-2.22.0.0 ===================================== utils/haddock/cabal.project ===================================== @@ -12,4 +12,4 @@ package haddock-api tests: False -- Pinning the index-state helps to make reasonably CI deterministic -index-state: 2024-06-18T11:54:44Z +index-state: 2025-07-15T16:39:57Z View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/39ed6aa5e4378164accff734c3afd14… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/39ed6aa5e4378164accff734c3afd14… 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] 6 commits: level imports: Fix infinite loop with cyclic module imports
by Marge Bot (＠marge-bot) 22 Jul '25

22 Jul '25

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: 8b731e3c by Matthew Pickering at 2025-07-21T13:36:43-04:00 level imports: Fix infinite loop with cyclic module imports I didn't anticipate that downsweep would run before we checked for cyclic imports. Therefore we need to use the reachability function which handles cyclic graphs. Fixes #26087 - - - - - d751a9f1 by Pierre Thierry at 2025-07-21T13:37:28-04:00 Fix documentation about deriving from generics - - - - - bca43b91 by Zubin Duggal at 2025-07-22T09:01:16-04:00 haddock: Don't warn about missing link destinations for derived names. Fixes #26114 - - - - - 22ec4499 by Matthew Pickering at 2025-07-22T09:01:17-04:00 template haskell: use a precise condition when implicitly lifting Implicit lifting corrects a level error by replacing references to `x` with `$(lift x)`, therefore you can use a level `n` binding at level `n + 1`, if it can be lifted. Therefore, we now have a precise check that the use level is 1 more than the bind level. Before this bug was not observable as you only had 0 and 1 contexts but it is easily evident when using explicit level imports. Fixes #26088 - - - - - 6f29b57e by Andreas Klebinger at 2025-07-22T09:01:18-04:00 Add since tag and more docs for do-clever-arg-eta-expansion Fixes #26113 - - - - - 7f86eda9 by Andreas Klebinger at 2025-07-22T09:01:18-04:00 Add since tag for -fexpose-overloaded-unfoldings Fixes #26112 - - - - - 16 changed files: - compiler/GHC/Rename/Splice.hs - compiler/GHC/Unit/Module/Graph.hs - docs/users_guide/using-optimisation.rst - libraries/base/src/GHC/Generics.hs - testsuite/tests/haddock/haddock_testsuite/Makefile - + testsuite/tests/haddock/haddock_testsuite/T26114.hs - + testsuite/tests/haddock/haddock_testsuite/T26114.stdout - testsuite/tests/haddock/haddock_testsuite/all.T - + testsuite/tests/splice-imports/T26087.stderr - + testsuite/tests/splice-imports/T26087A.hs - + testsuite/tests/splice-imports/T26087B.hs - + testsuite/tests/splice-imports/T26088.stderr - + testsuite/tests/splice-imports/T26088A.hs - + testsuite/tests/splice-imports/T26088B.hs - testsuite/tests/splice-imports/all.T - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs Changes: ===================================== compiler/GHC/Rename/Splice.hs ===================================== @@ -35,6 +35,7 @@ import GHC.Rename.Pat ( rnPat ) import GHC.Types.Error import GHC.Types.Basic ( TopLevelFlag, isTopLevel, maxPrec ) import GHC.Types.SourceText ( SourceText(..) ) +import GHC.Types.ThLevelIndex import GHC.Utils.Outputable import GHC.Unit.Module import GHC.Types.SrcLoc @@ -1001,7 +1002,7 @@ checkCrossLevelLifting dflags reason top_lvl is_local allow_lifting bind_lvl use , xopt LangExt.ImplicitStagePersistence dflags = when (isExternalName name) (keepAlive name) >> return (HsVar noExtField name_var) -- 4. Name is in a bracket, and lifting is allowed | Brack _ pending <- use_lvl - , any (use_lvl_idx >=) (Set.toList bind_lvl) + , any (\bind_idx -> use_lvl_idx == incThLevelIndex bind_idx) (Set.toList bind_lvl) , allow_lifting = do let mgre = case reason of ===================================== compiler/GHC/Unit/Module/Graph.hs ===================================== @@ -866,7 +866,7 @@ mkTransZeroDeps = first graphReachability {- module graph is acyclic -} . module -- | Transitive dependencies, but with the stage that each module is required at. mkStageDeps :: [ModuleGraphNode] -> (ReachabilityIndex StageSummaryNode, (NodeKey, ModuleStage) -> Maybe StageSummaryNode) -mkStageDeps = first graphReachability . moduleGraphNodesStages +mkStageDeps = first cyclicGraphReachability . moduleGraphNodesStages type ZeroSummaryNode = Node Int ZeroScopeKey ===================================== docs/users_guide/using-optimisation.rst ===================================== @@ -547,16 +547,24 @@ as such you shouldn't need to set any of them explicitly. A flag Eta-expand let-bindings to increase their arity. .. ghc-flag:: -fdo-clever-arg-eta-expansion - :shortdesc: Enable sophisticated argument eta-expansion. Implied by :ghc-flag:`-O2`. + :shortdesc: Enable sophisticated argument eta-expansion. Implied by :ghc-flag:`-O`. :type: dynamic :reverse: -fno-do-clever-arg-eta-expansion :category: :default: off + :since: 9.10.1 Eta-expand arguments to increase their arity to avoid allocating unnecessary thunks for them. + For example in code like `foo = f (g x)` this flag will determine which analysis + is used to decide the arity of `g x`, with the goal of avoiding a thunk for `g x` + in cases where `g` is a function with an arity higher than one. + + Enabling the flag enables a more sophisticated analysis, resulting in better + runtime but longer compile time. + .. ghc-flag:: -feager-blackholing :shortdesc: Turn on :ref:`eager blackholing <parallel-compile-options>` :type: dynamic @@ -617,6 +625,7 @@ as such you shouldn't need to set any of them explicitly. A flag :category: :default: off + :since: 9.12.1 This experimental flag is a slightly less heavy weight alternative to :ghc-flag:`-fexpose-all-unfoldings`. ===================================== libraries/base/src/GHC/Generics.hs ===================================== @@ -392,9 +392,14 @@ module GHC.Generics ( -- instance (Encode a) => Encode (Tree a) -- @ -- --- The generic default is being used. In the future, it will hopefully be --- possible to use @deriving Encode@ as well, but GHC does not yet support --- that syntax for this situation. +-- The generic default is being used. Alternatively the @DeriveAnyClass@ language extension can be +-- used to derive Encode: +-- +-- @ +-- {-# LANGUAGE DeriveAnyClass #-} +-- data Tree a = Leaf a | Node (Tree a) (Tree a) +-- deriving (Generic, Encode) +-- @ -- -- Having @Encode@ as a class has the advantage that we can define -- non-generic special cases, which is particularly useful for abstract ===================================== testsuite/tests/haddock/haddock_testsuite/Makefile ===================================== @@ -76,3 +76,7 @@ hypsrcTest: .PHONY: haddockForeignTest haddockForeignTest: '$(HADDOCK)' A.hs B.hs F.hs arith.c + +.PHONY: T26114 +T26114: + '$(HADDOCK)' T26114.hs ===================================== testsuite/tests/haddock/haddock_testsuite/T26114.hs ===================================== @@ -0,0 +1,23 @@ +{-# LANGUAGE TypeFamilies #-} + +-- | Module +module T26114 where + +-- | C1 +class C1 t where + type C2 t + +-- | A +data A = A + +instance C1 A where + type C2 A = B + +-- | B +data B = B + +instance C1 B where + type C2 B = C + +-- | C +data C = C ===================================== testsuite/tests/haddock/haddock_testsuite/T26114.stdout ===================================== @@ -0,0 +1,3 @@ +[1 of 1] Compiling T26114 ( T26114.hs, nothing ) +Haddock coverage: + 100% ( 5 / 5) in 'T26114' ===================================== testsuite/tests/haddock/haddock_testsuite/all.T ===================================== @@ -24,3 +24,8 @@ test('haddockForeignTest', [ignore_stdout, ignore_stderr, req_haddock, extra_files(['./haddock-th-foreign-repro/A.hs', './haddock-th-foreign-repro/B.hs', './haddock-th-foreign-repro/F.hs', './haddock-th-foreign-repro/arith.c'])], makefile_test, ['haddockForeignTest']) + +test('T26114', + [ignore_stderr, req_haddock, extra_files(['T26114.hs'])], + makefile_test, + ['T26114']) ===================================== testsuite/tests/splice-imports/T26087.stderr ===================================== @@ -0,0 +1,6 @@ +./T26087B.hs: error: [GHC-92213] + Module graph contains a cycle: + module ‘main:T26087B’ (./T26087B.hs) + imports module ‘main:T26087A’ (T26087A.hs) + which imports module ‘main:T26087B’ (./T26087B.hs) + ===================================== testsuite/tests/splice-imports/T26087A.hs ===================================== @@ -0,0 +1,4 @@ +{-# LANGUAGE ExplicitLevelImports #-} +module T26087A where + +import quote T26087B ===================================== testsuite/tests/splice-imports/T26087B.hs ===================================== @@ -0,0 +1,4 @@ +{-# LANGUAGE ExplicitLevelImports, TemplateHaskell #-} +module T26087B where + +import T26087A ===================================== testsuite/tests/splice-imports/T26088.stderr ===================================== @@ -0,0 +1,6 @@ +T26088A.hs:8:8: error: [GHC-28914] + • Level error: ‘a’ is bound at level -1 but used at level 1 + • Available from the imports: + • imported from ‘T26088B’ at -1 at T26088A.hs:4:1-21 + • In the Template Haskell quotation: [| a |] + ===================================== testsuite/tests/splice-imports/T26088A.hs ===================================== @@ -0,0 +1,8 @@ +{-# LANGUAGE ExplicitLevelImports, TemplateHaskell #-} +module T26088A where + +import splice T26088B +import Language.Haskell.TH.Syntax + +x :: Q Exp +x = [| a |] ===================================== testsuite/tests/splice-imports/T26088B.hs ===================================== @@ -0,0 +1,3 @@ +module T26088B where + +a = () ===================================== testsuite/tests/splice-imports/all.T ===================================== @@ -46,3 +46,5 @@ test('SI35', compile_and_run, ['-package ghc']) test('SI36', [extra_files(["SI36_A.hs", "SI36_B1.hs", "SI36_B2.hs", "SI36_B3.hs", "SI36_C1.hs", "SI36_C2.hs", "SI36_C3.hs"])], multimod_compile_fail, ['SI36', '-v0']) +test('T26087', [], multimod_compile_fail, ['T26087A', '']) +test('T26088', [], multimod_compile_fail, ['T26088A', '-v0']) ===================================== utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs ===================================== @@ -110,6 +110,7 @@ renameInterface ignoreSet renamingEnv expInfo warnings hoogle iface = do && isExternalName name && not (isBuiltInSyntax name) && not (isTyVarName name) + && not (isDerivedOccName $ nameOccName name) && Exact name /= eqTyCon_RDR -- Must not be in the set of ignored symbols for the module or the -- unqualified ignored symbols View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9480fe9608d86bdb706e2043cb7cca… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9480fe9608d86bdb706e2043cb7cca… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/fendor/backtraces-decoders] Allow users to customise the collection of exception annotations
by Hannes Siebenhandl (＠fendor) 22 Jul '25

22 Jul '25

Hannes Siebenhandl pushed to branch wip/fendor/backtraces-decoders at Glasgow Haskell Compiler / GHC Commits: ab72bcc6 by fendor at 2025-07-22T14:33:53+02:00 Allow users to customise the collection of exception annotations Add a global `CollectExceptionAnnotationMechanism` which determines how `ExceptionAnnotation`s are collected upon throwing an `Exception`. This API is exposed via `ghc-experimental`. By overriding how we collect `Backtraces`, we can control how the `Backtraces` are displayed to the user by newtyping `Backtraces` and giving a different instance for `ExceptionAnnotation`. A concrete use-case for this feature is allowing us to experiment with alternative stack decoders, without having to modify `base`, which take additional information from the stack frames. This commit does not modify how `Backtraces` are currently collected or displayed. - - - - - 24 changed files: - + libraries/ghc-experimental/src/GHC/Exception/Backtrace/Experimental.hs - libraries/ghc-internal/src/GHC/Internal/Exception.hs - libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs - libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot - testsuite/tests/arrows/should_compile/T21301.stderr - testsuite/tests/deSugar/should_fail/DsStrictFail.stderr - testsuite/tests/deSugar/should_run/T20024.stderr - testsuite/tests/deSugar/should_run/dsrun005.stderr - testsuite/tests/deSugar/should_run/dsrun007.stderr - testsuite/tests/deSugar/should_run/dsrun008.stderr - testsuite/tests/deriving/should_run/T9576.stderr - testsuite/tests/ghci/scripts/Defer02.stderr - testsuite/tests/ghci/scripts/T15325.stderr - testsuite/tests/patsyn/should_run/ghci.stderr - testsuite/tests/quotes/LiftErrMsgDefer.stderr - testsuite/tests/safeHaskell/safeLanguage/SafeLang15.stderr - testsuite/tests/type-data/should_run/T22332a.stderr - testsuite/tests/typecheck/should_run/T10284.stderr - testsuite/tests/typecheck/should_run/T13838.stderr - testsuite/tests/typecheck/should_run/T9497a-run.stderr - testsuite/tests/typecheck/should_run/T9497b-run.stderr - testsuite/tests/typecheck/should_run/T9497c-run.stderr - testsuite/tests/unsatisfiable/T23816.stderr - testsuite/tests/unsatisfiable/UnsatDefer.stderr Changes: ===================================== libraries/ghc-experimental/src/GHC/Exception/Backtrace/Experimental.hs ===================================== @@ -0,0 +1,20 @@ +{- +Module : GHC.Exception.Backtrace.Experimental +Copyright : (c) The GHC Team +License : see libraries/ghc-experimental/LICENSE + +Maintainer : ghc-devs(a)haskell.org +Stability : experimental +Portability : non-portable (GHC extensions) + +This module exposes experimental extensions to the Backtrace mechanism of GHC. +-} +module GHC.Exception.Backtrace.Experimental ( + -- * Collecting exception annotations (like backtraces) + CollectExceptionAnnotationMechanism, + getCollectExceptionAnnotationMechanism, + setCollectExceptionAnnotation, + collectExceptionAnnotation, + ) where + +import GHC.Internal.Exception.Backtrace ===================================== libraries/ghc-internal/src/GHC/Internal/Exception.hs ===================================== @@ -70,7 +70,8 @@ import GHC.Internal.Show import GHC.Internal.Stack.Types import GHC.Internal.IO.Unsafe import {-# SOURCE #-} GHC.Internal.Stack (prettyCallStackLines, prettyCallStack, prettySrcLoc, withFrozenCallStack) -import {-# SOURCE #-} GHC.Internal.Exception.Backtrace (collectBacktraces) +import {-# SOURCE #-} GHC.Internal.Exception.Backtrace (collectExceptionAnnotation) +import GHC.Internal.Exception.Context (SomeExceptionAnnotation(..)) import GHC.Internal.Exception.Type -- | Throw an exception. Exceptions may be thrown from purely @@ -166,8 +167,8 @@ toExceptionWithBacktrace :: (HasCallStack, Exception e) => e -> IO SomeException toExceptionWithBacktrace e | backtraceDesired e = do - bt <- collectBacktraces - return (addExceptionContext bt (toException e)) + SomeExceptionAnnotation ea <- collectExceptionAnnotation + return (addExceptionContext ea (toException e)) | otherwise = return (toException e) -- | This is thrown when the user calls 'error'. The @String@ is the ===================================== libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs ===================================== @@ -12,7 +12,7 @@ import GHC.Internal.IO.Unsafe (unsafePerformIO) import GHC.Internal.Exception.Context import GHC.Internal.Ptr import GHC.Internal.Data.Maybe (fromMaybe) -import GHC.Internal.Stack.Types as GHC.Stack (CallStack) +import GHC.Internal.Stack.Types as GHC.Stack (CallStack, HasCallStack) import qualified GHC.Internal.Stack as HCS import qualified GHC.Internal.ExecutionStack.Internal as ExecStack import qualified GHC.Internal.Stack.CloneStack as CloneStack @@ -86,6 +86,40 @@ setBacktraceMechanismState bm enabled = do _ <- atomicModifyIORef'_ enabledBacktraceMechanismsRef (setBacktraceMechanismEnabled bm enabled) return () +-- | How to collect 'ExceptionAnnotation's on throwing 'Exception's. +-- +-- @since base-4.23.0.0 +data CollectExceptionAnnotationMechanism = CollectExceptionAnnotationMechanism + { ceaCollectExceptionAnnotationMechanism :: HasCallStack => IO SomeExceptionAnnotation + } + +defaultCollectExceptionAnnotationMechanism :: CollectExceptionAnnotationMechanism +defaultCollectExceptionAnnotationMechanism = CollectExceptionAnnotationMechanism + { ceaCollectExceptionAnnotationMechanism = SomeExceptionAnnotation `fmap` collectBacktraces + } + +collectExceptionAnnotationMechanismRef :: IORef CollectExceptionAnnotationMechanism +collectExceptionAnnotationMechanismRef = + unsafePerformIO $ newIORef defaultCollectExceptionAnnotationMechanism +{-# NOINLINE collectExceptionAnnotationMechanismRef #-} + +-- | Returns the current callback for collecting 'ExceptionAnnotation's on throwing 'Exception's. +-- +-- @since base-4.23.0.0 +getCollectExceptionAnnotationMechanism :: IO CollectExceptionAnnotationMechanism +getCollectExceptionAnnotationMechanism = readIORef collectExceptionAnnotationMechanismRef + +-- | Set the callback for collecting an 'ExceptionAnnotation'. +-- +-- @since base-4.23.0.0 +setCollectExceptionAnnotation :: ExceptionAnnotation a => (HasCallStack => IO a) -> IO () +setCollectExceptionAnnotation collector = do + let cea = CollectExceptionAnnotationMechanism + { ceaCollectExceptionAnnotationMechanism = fmap SomeExceptionAnnotation collector + } + _ <- atomicModifyIORef'_ collectExceptionAnnotationMechanismRef (const cea) + return () + -- | A collection of backtraces. data Backtraces = Backtraces { @@ -124,6 +158,15 @@ displayBacktraces bts = concat instance ExceptionAnnotation Backtraces where displayExceptionAnnotation = displayBacktraces +-- | Collect 'SomeExceptionAnnotation' based on the configuration of the +-- global 'CollectExceptionAnnotationMechanism'. +-- +-- @since base-4.23.0.0 +collectExceptionAnnotation :: HasCallStack => IO SomeExceptionAnnotation +collectExceptionAnnotation = HCS.withFrozenCallStack $ do + cea <- getCollectExceptionAnnotationMechanism + ceaCollectExceptionAnnotationMechanism cea + -- | Collect a set of 'Backtraces'. collectBacktraces :: (?callStack :: CallStack) => IO Backtraces collectBacktraces = HCS.withFrozenCallStack $ do ===================================== libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot ===================================== @@ -5,11 +5,7 @@ module GHC.Internal.Exception.Backtrace where import GHC.Internal.Base (IO) import GHC.Internal.Stack.Types (HasCallStack) -import GHC.Internal.Exception.Context (ExceptionAnnotation) - -data Backtraces - -instance ExceptionAnnotation Backtraces +import GHC.Internal.Exception.Context (SomeExceptionAnnotation) -- For GHC.Exception -collectBacktraces :: HasCallStack => IO Backtraces +collectExceptionAnnotation :: HasCallStack => IO SomeExceptionAnnotation ===================================== testsuite/tests/arrows/should_compile/T21301.stderr ===================================== @@ -4,7 +4,7 @@ T21301.hs:(8,7)-(10,6): Non-exhaustive patterns in case HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:434:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/deSugar/should_fail/DsStrictFail.stderr ===================================== @@ -4,7 +4,7 @@ DsStrictFail.hs:4:12-23: Non-exhaustive patterns in False HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:434:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/deSugar/should_run/T20024.stderr ===================================== @@ -4,7 +4,7 @@ T20024.hs:2:12-32: Non-exhaustive guards in pattern binding HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:431:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/deSugar/should_run/dsrun005.stderr ===================================== @@ -4,7 +4,7 @@ dsrun005.hs:42:1-18: Non-exhaustive patterns in function f HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:434:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/deSugar/should_run/dsrun007.stderr ===================================== @@ -4,7 +4,7 @@ dsrun007.hs:5:23-25: Missing field in record construction HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:432:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/deSugar/should_run/dsrun008.stderr ===================================== @@ -4,7 +4,7 @@ dsrun008.hs:2:32-36: Non-exhaustive patterns in (2, x) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:434:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/deriving/should_run/T9576.stderr ===================================== @@ -13,7 +13,7 @@ T9576.hs:6:31: error: [GHC-39999] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/ghci/scripts/Defer02.stderr ===================================== @@ -71,8 +71,8 @@ Defer01.hs:49:5: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base *** Exception: Defer01.hs:13:5: error: [GHC-83865] @@ -82,8 +82,8 @@ HasCallStack backtrace: (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base *** Exception: Defer01.hs:17:9: error: [GHC-39999] @@ -93,8 +93,8 @@ HasCallStack backtrace: (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base <interactive>:10:11: error: [GHC-83865] @@ -113,8 +113,8 @@ HasCallStack backtrace: (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base *** Exception: Defer01.hs:30:5: error: [GHC-83865] @@ -127,8 +127,8 @@ HasCallStack backtrace: (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base *** Exception: Defer01.hs:33:8: error: [GHC-25897] @@ -146,8 +146,8 @@ HasCallStack backtrace: (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base *** Exception: Defer01.hs:38:17: error: [GHC-83865] @@ -161,8 +161,8 @@ HasCallStack backtrace: (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base *** Exception: Defer01.hs:42:5: error: [GHC-39999] @@ -172,8 +172,8 @@ HasCallStack backtrace: (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base <interactive>:16:8: error: [GHC-18872] @@ -192,7 +192,7 @@ HasCallStack backtrace: (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/ghci/scripts/T15325.stderr ===================================== @@ -24,7 +24,7 @@ T15325.hs:11:9: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/patsyn/should_run/ghci.stderr ===================================== @@ -2,7 +2,7 @@ HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:168:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:88:42 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:434:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/quotes/LiftErrMsgDefer.stderr ===================================== @@ -11,7 +11,7 @@ LiftErrMsgDefer.hs:14:12: warning: [GHC-28914] [-Wdeferred-type-errors (in -Wdef (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/safeHaskell/safeLanguage/SafeLang15.stderr ===================================== @@ -4,7 +4,7 @@ SafeLang15.hs:22:9-37: Non-exhaustive patterns in Just p' HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:434:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/type-data/should_run/T22332a.stderr ===================================== @@ -4,7 +4,7 @@ T22332a.hs:18:1-35: Non-exhaustive patterns in Just eq HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:434:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/typecheck/should_run/T10284.stderr ===================================== @@ -7,7 +7,7 @@ T10284.hs:7:5: error: [GHC-83865] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/typecheck/should_run/T13838.stderr ===================================== @@ -1,4 +1,4 @@ -T13838.exe: Uncaught exception ghc-internal:GHC.Internal.Control.Exception.Base.TypeError: +T13838: Uncaught exception ghc-internal:GHC.Internal.Control.Exception.Base.TypeError: T13838.hs:6:1: error: [GHC-83865] • Couldn't match expected type: IO t0 @@ -9,7 +9,7 @@ T13838.hs:6:1: error: [GHC-83865] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries\ghc-internal\src\GHC\Internal\Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries\ghc-internal\src\GHC\Internal\Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception - throw, called at libraries\ghc-internal\src\GHC\Internal\Control\Exception\Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception + throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/typecheck/should_run/T9497a-run.stderr ===================================== @@ -19,7 +19,7 @@ T9497a-run.hs:2:8: error: [GHC-88464] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/typecheck/should_run/T9497b-run.stderr ===================================== @@ -19,7 +19,7 @@ T9497b-run.hs:2:8: error: [GHC-88464] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/typecheck/should_run/T9497c-run.stderr ===================================== @@ -19,7 +19,7 @@ T9497c-run.hs:2:8: error: [GHC-88464] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/unsatisfiable/T23816.stderr ===================================== @@ -8,7 +8,7 @@ T23816.hs:18:15: error: [GHC-22250] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base ===================================== testsuite/tests/unsatisfiable/UnsatDefer.stderr ===================================== @@ -7,7 +7,7 @@ UnsatDefer.hs:20:7: error: [GHC-22250] (deferred type error) HasCallStack backtrace: - collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception - toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:84:32 in ghc-internal:GHC.Internal.Exception + collectExceptionAnnotation, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception + toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:89:42 in ghc-internal:GHC.Internal.Exception throw, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:435:30 in ghc-internal:GHC.Internal.Control.Exception.Base View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/ab72bcc63a6594e824a0e8f0c34d19b… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/ab72bcc63a6594e824a0e8f0c34d19b… You're receiving this email because of your account on gitlab.haskell.org.

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