sheaf pushed to branch wip/T26878 at Glasgow Haskell Compiler / GHC
Commits:
b575e28a by Simon Peyton Jones at 2026-03-12T10:50:22+01:00
Simplify mkTick
This commit simplifies 'GHC.Core.Utils.mkTick', removing the
accumulating parameter 'rest' which was suspiciously treating a bunch of
different ticks as a group, and moving the group as a whole around the
AST, ignoring that the ticks in the group might have different placement
properties.
A few other changes are also implemented:
- simplify 'can_split' predicate (no functional change)
- drop profiling ticks around coercions, fixing #26941
- combine profiling ticks into one when possible
Fixes #26878 and #26941
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
- - - - -
5 changed files:
- compiler/GHC/Core/Utils.hs
- compiler/GHC/Types/Tickish.hs
- + testsuite/tests/simplCore/should_compile/T26941.hs
- + testsuite/tests/simplCore/should_compile/T26941_aux.hs
- testsuite/tests/simplCore/should_compile/all.T
Changes:
=====================================
compiler/GHC/Core/Utils.hs
=====================================
@@ -303,59 +303,72 @@ mkCast expr co
* *
********************************************************************* -}
--- | Wraps the given expression in the source annotation, dropping the
--- annotation if possible.
+-- | Wraps the given expression in a Tick while respecting Tick invariants,
+-- and performing small on-the-fly optimisations.
+--
+-- Prefer using 'mkTick' over explicit use of the 'Tick' constructor.
+--
+-- Small optimisations performed:
+--
+-- * Minimise the AST covered by the tick, by pushing the tick deeper into
+-- the expression if this doesn't change the semantics of the tick.
+-- For example, push runtime relevant ticks through type applications
+-- and type lambdas.
+-- * Eliminate unnecessary ticks by either absorbing them into existing ones
+-- or dropping them if that is valid (e.g. dropping profiling ticks around
+-- types, coercions and literals).
+-- * Split profiling ticks into counting/scoping parts so that the two parts
+-- can be placed independently into the AST.
mkTick :: CoreTickish -> CoreExpr -> CoreExpr
-mkTick t orig_expr = mkTick' id orig_expr
+mkTick t orig_expr = mkTick' orig_expr
where
-- Some ticks (cost-centres) can be split in two, with the
-- non-counting part having laxer placement properties.
- canSplit = tickishCanSplit t && tickishPlace (mkNoCount t) /= tickishPlace t
+ -- See Note [Scoping ticks and counting ticks] in GHC.Types.Tickish.
+ can_split = tickishCanSplit t
- -- mkTick' handles floating of ticks *into* the expression.
- mkTick' :: (CoreExpr -> CoreExpr) -- Apply before adding tick (float with)
- -- Always a composition of (Tick t) wrappers
- -> CoreExpr -- Current expression
- -> CoreExpr
- -- So in the call (mkTick' rest e), the expression
- -- (rest e)
- -- has the same type as e
- -- Returns an expression equivalent to (Tick t (rest e))
- mkTick' rest expr = case expr of
- -- Float ticks into unsafe coerce the same way we would do with a cast.
- Case scrut bndr ty alts@[Alt ac abs _rhs]
- | Just rhs <- isUnsafeEqualityCase scrut bndr alts
- -> Case scrut bndr ty [Alt ac abs (mkTick' rest rhs)]
+ stop_here e = Tick t e -- Just wrap `t` around the current expression
+ -- That's the default option!
- -- Cost centre ticks should never be reordered relative to each
- -- other. Therefore we can stop whenever two collide.
+ -- mkTick' handles floating of tick `t` *into* the expression.
+ mkTick' :: CoreExpr -> CoreExpr
+ mkTick' expr = case expr of
Tick t2 e
- | ProfNote{} <- t2, ProfNote{} <- t -> Tick t $ rest expr
-
- -- Otherwise we assume that ticks of different placements float
- -- through each other.
- | tickishPlace t2 /= tickishPlace t -> Tick t2 $ mkTick' rest e
+ | ProfNote { profNoteCC = cc1, profNoteCount = cnt1, profNoteScope = scope1 } <- t
+ , ProfNote { profNoteCC = cc2, profNoteCount = cnt2, profNoteScope = scope2 } <- t2
+ ->
+ -- Common up ticks with a shared cost centre.
+ -- Alas, if both ticks count, we are forced to retain both.
+ if cc1 == cc2 && (not cnt1 || not cnt2)
+ then
+ let t' = ProfNote { profNoteCC = cc1
+ , profNoteCount = cnt1 || cnt2
+ , profNoteScope = scope1 || scope2
+ }
+ in mkTick t' e
+ else
+ -- Cost centre ticks for different cost centres should never be reordered
+ -- relative to each other. Therefore we can stop whenever two collide.
+ stop_here expr
+
+ | tickishPlace t2 /= tickishPlace t
+ -> -- Otherwise, we assume that ticks of different
+ -- placements float through each other.
+ Tick t2 $ mkTick' e
+
+ -- For source note ticks, this is where we make sure to
+ -- not introduce redundant ticks.
+ | tickishContains t t2 -> mkTick' e -- Drop t2
+ | tickishContains t2 t -> expr -- Drop t
- -- For annotations this is where we make sure to not introduce
- -- redundant ticks.
- | tickishContains t t2 -> mkTick' rest e -- Drop t2
- | tickishContains t2 t -> rest e -- Drop t
- | otherwise -> mkTick' (rest . Tick t2) e
-
- -- Ticks don't care about types, so we just float all ticks
- -- through them. Note that it's not enough to check for these
- -- cases top-level. While mkTick will never produce Core with type
- -- expressions below ticks, such constructs can be the result of
- -- unfoldings. We therefore make an effort to put everything into
- -- the right place no matter what we start with.
- Cast e co -> mkCast (mkTick' rest e) co
- Coercion co -> Tick t $ rest (Coercion co)
+ | otherwise
+ -> stop_here expr -- Always safe
Lam x e
-- Always float through type lambdas. Even for non-type lambdas,
-- floating is allowed for all but the most strict placement rule.
| not (isRuntimeVar x) || tickishPlace t /= PlaceRuntime
- -> Lam x $ mkTick' rest e
+ -> Lam x $ mkTick' e
-- If it is both counting and scoped, we split the tick into its
-- two components, often allowing us to keep the counting tick on
@@ -363,26 +376,41 @@ mkTick t orig_expr = mkTick' id orig_expr
-- The point of this is that the counting tick can probably be
-- floated, and the lambda may then be in a position to be
-- beta-reduced.
- | canSplit
- -> Tick (mkNoScope t) $ rest $ Lam x $ mkTick (mkNoCount t) e
+ | can_split
+ -> Tick (mkNoScope t) $ Lam x $ mkTick (mkNoCount t) e
App f arg
-- Always float through type applications.
| not (isRuntimeArg arg)
- -> App (mkTick' rest f) arg
+ -> App (mkTick' f) arg
-- We can also float through constructor applications, placement
- -- permitting. Again we can split.
- | isSaturatedConApp expr && (tickishPlace t==PlaceCostCentre || canSplit)
+ -- permitting. Again we can try splitting.
+ | isSaturatedConApp expr
+ , tickishPlace t == PlaceCostCentre || can_split
-> if tickishPlace t == PlaceCostCentre
- then rest $ tickHNFArgs t expr
- else Tick (mkNoScope t) $ rest $ tickHNFArgs (mkNoCount t) expr
+ then tickHNFArgs t expr
+ else Tick (mkNoScope t) $ tickHNFArgs (mkNoCount t) expr
+
+ -- Ticks don't care about types, so we just float all ticks
+ -- through them. Note that it's not enough to check for these
+ -- cases at the top-level. While mkTick will never produce Core with type
+ -- expressions below ticks, such constructs can be the result of
+ -- unfoldings. We therefore make an effort to put everything into
+ -- the right place no matter what we start with.
+ Cast e co -> mkCast (mkTick' e) co
+
+ -- Float ticks into 'unsafeCoerce' the same way we would do with a cast.
+ Case scrut bndr ty alts@[Alt ac abs _rhs]
+ | Just rhs <- isUnsafeEqualityCase scrut bndr alts
+ -> Case scrut bndr ty [Alt ac abs (mkTick' rhs)]
Var x
- | notFunction && tickishPlace t == PlaceCostCentre
- -> rest expr -- Drop t
- | notFunction && canSplit
- -> Tick (mkNoScope t) $ rest expr
+ | notFunction
+ , tickishPlace t == PlaceCostCentre || can_split
+ -> if tickishPlace t == PlaceCostCentre
+ then expr -- Drop tick t entirely
+ else Tick (mkNoScope t) expr
where
-- SCCs can be eliminated on variables provided the variable
-- is not a function. In these cases the SCC makes no difference:
@@ -392,12 +420,26 @@ mkTick t orig_expr = mkTick' id orig_expr
-- when the function is called, so we must retain those.
notFunction = not (isFunTy (idType x))
- Lit{}
- | tickishPlace t == PlaceCostCentre
- -> rest expr -- Drop t
-
- -- Catch-all: Annotate where we stand
- _any -> Tick t $ rest expr
+ -- It doesn't make sense to wrap static data (such as coercions, types and literals)
+ -- in a tick which compiles to code, as the code will never be run.
+ --
+ -- It is in fact actively harmful, because Core Lint will fail on a
+ -- coercion binding such as let co = <scc> (...), see #26941.
+ -- It makes more sense to discard the cost centre tick rather than weakening
+ -- Core Lint.
+ e@(Coercion {})
+ | tickishIsCode t
+ -> e
+ e@(Type {})
+ | tickishIsCode t
+ -> e
+ e@(Lit {})
+ | tickishIsCode t
+ -> e
+
+ -- Catch-all: annotate where we stand.
+ -- In particular (but not only): Let, most Cases.
+ _any -> Tick t expr
mkTicks :: [CoreTickish] -> CoreExpr -> CoreExpr
mkTicks ticks expr = foldr mkTick expr ticks
=====================================
compiler/GHC/Types/Tickish.hs
=====================================
@@ -261,6 +261,10 @@ Ticks have two independent attributes:
See Note [Scoped ticks]
+Note that profiling notes which both count and scope can be split into two
+separate ticks, one that counts and doesn't scope and one that scopes and doesn't
+count; see 'tickishCanSplit', 'mkNoCount' and 'mkNoScope'.
+
Note [Counting ticks]
~~~~~~~~~~~~~~~~~~~~
The following ticks count:
@@ -451,7 +455,7 @@ data TickishPlacement =
-- legal placement rule for counting ticks.
-- NB: We generally try to move these as close to the relevant
-- runtime expression as possible. This means they get pushed through
- -- tyoe arguments. E.g. we create `(tick f) @Bool` instead of `tick (f @Bool)`.
+ -- type arguments. E.g. we create `(tick f) @Bool` instead of `tick (f @Bool)`.
PlaceRuntime
-- | As @PlaceRuntime@, but we float the tick through all
=====================================
testsuite/tests/simplCore/should_compile/T26941.hs
=====================================
@@ -0,0 +1,14 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE TypeOperators #-}
+
+module T26941 where
+
+import GHC.TypeLits
+
+import T26941_aux ( SMayNat(SKnown), ListH, shxHead )
+
+shsHead :: ListH (Just n : sh) Int -> SNat n
+shsHead shx =
+ case shxHead shx of
+ SKnown SNat -> SNat
=====================================
testsuite/tests/simplCore/should_compile/T26941_aux.hs
=====================================
@@ -0,0 +1,20 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE StandaloneKindSignatures #-}
+{-# LANGUAGE TypeOperators #-}
+
+module T26941_aux where
+
+import Data.Kind
+import GHC.TypeLits
+
+shxHead :: ListH (n : sh) i -> SMayNat i n
+shxHead list = {-# SCC "bad_scc" #-}
+ ( case list of (i `ConsKnown` _) -> SKnown i )
+
+type ListH :: [Maybe Nat] -> Type -> Type
+data ListH sh i where
+ ConsKnown :: SNat n -> ListH sh i -> ListH (Just n : sh) i
+
+data SMayNat i n where
+ SKnown :: SNat n -> SMayNat i (Just n)
=====================================
testsuite/tests/simplCore/should_compile/all.T
=====================================
@@ -568,6 +568,8 @@ test('T26117', [grep_errmsg(r'==')], compile, ['-O -ddump-simpl -dsuppress-uniqu
test('T26349', normal, compile, ['-O -ddump-rules'])
test('T26681', normal, compile, ['-O'])
+test('T26941', [extra_files(['T26941_aux.hs']), req_profiling], multimod_compile, ['T26941', '-v0 -O -prof'])
+
# T26709: we expect three `case` expressions not four
test('T26709', [grep_errmsg(r'case')],
multimod_compile,
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[Git][ghc/ghc][wip/fendor/linkable-usage] 58 commits: Add SIMD absolute value on x86 and LLVM
by Hannes Siebenhandl (＠fendor) 12 Mar '26
by Hannes Siebenhandl (＠fendor) 12 Mar '26
12 Mar '26
Hannes Siebenhandl pushed to branch wip/fendor/linkable-usage at Glasgow Haskell Compiler / GHC
Commits:
476c4cdf by Sean D. Gillespie at 2026-03-02T10:14:37-05:00
Add SIMD absolute value on x86 and LLVM
On x86, absolute value of 32 bits or less is implemented with
PABSB/PABSW/PABSD if SSSE3 is available. Otherwise, there is a fallback
for SSE2. For 64 bit integers it uses VPABSQ, required by AVX-512VL,
with fallbacks for SSE4.2 and SSE2.
There is no dedicated instruction for floating point absolute value on
x86, so it is simulated using bitwise AND.
Absolute value for signed integers and floats are implemented by the
"llvm.abs/llvm.fabs" standard library intrinsics. This implementation
uses MachOps constructors, unlike non-vector floating point absolute
value, which uses CallishMachOps.
- - - - -
709448c0 by Sean D. Gillespie at 2026-03-02T10:14:46-05:00
Add SIMD floating point square root
On x86, this is implemented with the SQRTPS and SQRTPD instructions. On
LLVM, it uses the sqrt library intrinstic.
- - - - -
0deadf66 by Sean D. Gillespie at 2026-03-02T10:14:47-05:00
Improve error message for SIMD on aarch64
When encountering vector literals on aarch64, previously it would
throw:
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.15.20251219:
getRegister' (CmmLit:CmmVec):
Now it is more consistent with the other vector operations:
<no location info>: error:
sorry! (unimplemented feature or known bug)
GHC version 9.15.20251219:
SIMD operations on AArch64 currently require the LLVM backend
- - - - -
7d64031b by Vladislav Zavialov at 2026-03-03T11:09:28-05:00
Replace maybeAddSpace with spaceIfSingleQuote
Simplify pretty-printing of HsTypes by using spaceIfSingleQuote.
This allows us to drop the unwieldy lhsTypeHasLeadingPromotionQuote
helper function.
Follow-up to 178c1fd830c78377ef5d338406a41e1d8eb5f0da
- - - - -
598db847 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Correct `hIsReadable` and `hIsWritable` for duplex handles
This contribution implements CLC proposal #371. It changes `hIsReadable`
and `hIsWritable` such that they always throw a respective exception
when encountering a closed or semi-closed handle, not just in the case
of a file handle.
- - - - -
b90201e5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Document `SemiClosedHandle`
- - - - -
c9df72b5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Tell users what “semi-closed” means for duplex handles
- - - - -
a8aa1868 by Ilias Tsitsimpis at 2026-03-06T06:26:29-05:00
Fix determinism of linker arguments
The switch from Data.Map to UniqMap in 3b5be05ac29 introduced
non-determinism in the order of packages passed to the linker.
This resulted in non-reproducible builds where the DT_NEEDED entries in
dynamic libraries were ordered differently across builds.
Fix the regression by explicitly sorting the package list derived from
UniqMap.
Fixes #26838
- - - - -
9b64ad3a by Matthew Pickering at 2026-03-06T06:27:16-05:00
determinism: Use a deterministic renaming when writing bytecode files
Now when writing the bytecode file, a counter and substitution are used
to provide deterministic keys to local variables (rather than relying on
uniques). This change ensures that `.gbc` are produced
deterministically.
Fixes #26499
- - - - -
d29800e0 by Teo Camarasu at 2026-03-06T06:28:46-05:00
ghc-internal: delete Version hs-boot loop
Version has a Read instance which needs Unicode but part of the Unicode interface is the unicode version. This is easy to resolve. We simply don't re-export the version from the Unicode module.
Resolves #26940
- - - - -
ad25af90 by Sylvain Henry at 2026-03-06T06:30:33-05:00
Linker: implement support for COMMON symbols (#6107)
Add some support for COMMON symbols. We don't support common symbols
having different sizes where the larger one is allocated after the
smaller one. The linker will fail with an appropriate error message if
it happens.
- - - - -
3b59f158 by Cheng Shao at 2026-03-06T06:31:16-05:00
compiler: fix redundant import of GHC.Hs.Lit
This patch removes a redundant import of `GHC.Hs.Lit` which causes a
ghc build failure with validate flavours when bootstrapping from 9.14.
Fixes #26972.
- - - - -
148d36f3 by Cheng Shao at 2026-03-06T06:32:01-05:00
compiler: avoid unneeded traversals in GHC.Unit.State
Following !15591, this patch avoids unneeded traversals in
`reportCycles`/`reportUnusable` when log verbosity is below given
threshold. Also applies `logVerbAtLeast` when appropriate.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
7e31367c by Cheng Shao at 2026-03-06T06:32:46-05:00
ghc-internal: fix redundant import in GHC.Internal.Event.Windows.ManagedThreadPool
This patch fixes redundant import in
`GHC.Internal.Event.Windows.ManagedThreadPool` that causes a
compilation error when building windows target with validate flavours
and bootstrapping from 9.14. Fixes #26976.
- - - - -
fc8b8e27 by sheaf at 2026-03-06T06:33:28-05:00
System.Info.fullCompilerVersion: add 'since' annot
Fixes #26973
- - - - -
c8238375 by Sylvain Henry at 2026-03-06T06:34:23-05:00
Hadrian: deprecate --bignum and automatically enable +native_bignum for JS
Deprecate --bignum=... to select the bignum backend. It's only used to
select the native backend, and this can be done with the +native_bignum
flavour transformer.
Additionally, we automatically enable +native_bignum for the JS target
because the GMP backend isn't supported.
- - - - -
a3ac7074 by Sylvain Henry at 2026-03-06T06:35:17-05:00
JS: fix putEnum/fromEnum (#24593)
Don't go through Word16 when serializing Enums.
- - - - -
0b36e96c by Andreas Klebinger at 2026-03-06T06:35:58-05:00
Docs: Document -fworker-wrapper-cbv default setting.
Fixes #26841
- - - - -
eca445e7 by mangoiv at 2026-03-07T05:02:36-05:00
drop deb9/10 from CI, add deb13
debian 9 and 10 are end of life, hence we drop them
from our CI, but we do add debian 13. Jobs that were
previously run on 9 and 10 run on 13, too, jobs that
were run on 10, are run on 11 now. Jobs that were
previously run on debian 12 are run on debian 13 now.
This MR also updates hadrian's bootstrap plans for that
reason.
Metric Decrease:
T9872d
- - - - -
12f8b829 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Fix GHC.Internal.Prim haddock
Haddock used to parse Haskell source to generate documentation,
but switched to using interface files instead. This broke documentation
of the GHC.Internal.Prim module, since it's a wired-in interface that
didn't provide a document structure.
This patch adds the missing document structure and updates genprimopcode
to make the section headers and descriptions available.
fixes #26954
- - - - -
f87e5e57 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Remove obsolete --make-haskell-source from genprimopcode
Now that haddock uses the wired-in interface for GHC.Internal.Prim,
the generated Haskell source file is no longer needed. Remove the
--make-haskell-source code generator from genprimopcode and replace
the generated GHC/Internal/Prim.hs with a minimal static source file.
- - - - -
4a7ddc7b by Sylvain Henry at 2026-03-07T05:04:59-05:00
JS: fix linking of exposed but non-preload units (#24886)
Units exposed in the unit database but not explicitly passed on the
command-line were not considered by the JS linker. This isn't an issue
for cabal which passes every unit explicitly but it is an issue when
using GHC directly (cf T24886 test).
- - - - -
689aafcd by mangoiv at 2026-03-07T05:05:52-05:00
testsuite: double foundation timeout multiplier
The runtime timeout in the foundation test was regularly hit by code
generated by the wasm backend - we increase the timout since the high
runtime is expected on the wasm backend for this rather complex test.
Resolves #26938
- - - - -
a46a1bb1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: add myCapabilityExpr to GHC.Cmm.Utils
This commit adds `myCapabilityExpr` to `GHC.Cmm.Utils` which is
computed from `BaseReg`. It's convenient for codegen logic where one
needs to pass the current Capability's pointer.
- - - - -
4afc65b1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: lower tryPutMVar# into a ccall directly
This patch addresses an old TODO of `stg_tryPutMVarzh` by removing it
completely and making the compiler lower `tryPutMVar#` into a ccall to
`performTryPutMVar` directly, without landing into an intermediate C
or Cmm function. `performTryPutMVar` is promoted to a public RTS
function with default visibility, and the compiler lowering logic
takes into account the C ABI of `performTryPutMVar` and converts from
C Bool to primop's `Int#` result properly.
- - - - -
9e3d6a58 by Simon Hengel at 2026-03-09T04:51:15-04:00
Don't use #line in haddocks
This confuses the parser. Haddock output is unaffected by this change.
(read: this still produces the same documentation)
- - - - -
f4e8fec2 by Wolfgang Jeltsch at 2026-03-09T04:52:01-04:00
Remove in-package dependencies on `GHC.Internal.System.IO`
This contribution eliminates all dependencies on
`GHC.Internal.System.IO` from within `ghc-internal`. It comprises the
following changes:
* Make `GHC.Internal.Fingerprint` independent of I/O support
* Tighten the dependencies of `GHC.Internal.Data.Version`
* Tighten the dependencies of `GHC.Internal.TH.Monad`
* Tighten the dependencies of `GHCi.Helpers`
* Move some code that needs `System.IO` to `template-haskell`
* Move the `GHC.ResponseFile` implementation into `base`
* Move the `System.Exit` implementation into `base`
* Move the `System.IO.OS` implementation into `base`
Metric Decrease:
size_hello_artifact
size_hello_artifact_gzip
size_hello_unicode
size_hello_unicode_gzip
- - - - -
91df4c82 by Sylvain Henry at 2026-03-09T04:53:20-04:00
T18832: fix Windows CI failure by dropping removeDirectoryRecursive
On Windows, open file handles prevent deletion. After killThread, the
closer thread may not have called hClose yet, causing removeDirectoryRecursive
to fail with "permission denied". The test harness cleans up the run
directory anyway, so the call is redundant.
- - - - -
d7fe9671 by Cheng Shao at 2026-03-09T04:54:04-04:00
compiler: fix redundant import in GHC.StgToJS.Object
This patch fixes a redundant import in GHC.StgToJS.Object that causes
a build failure when compiling head from 9.14 with validate flavours.
Fixes #26991.
- - - - -
0bfd29c3 by Cheng Shao at 2026-03-09T04:54:46-04:00
wasm: fix `Illegal foreign declaration` failure when ghci loads modules with JSFFI exports
This patch fixes a wasm ghci error when loading modules with JSFFI
exports; the `backendValidityOfCExport` check in `tcCheckFEType`
should only makes sense and should be performed when not checking the
JavaScript calling convention; otherwise, when the calling convention
is JavaScript, the codegen logic should be trusted to backends that
actually make use of it. Fixes #26998.
- - - - -
e659610c by Duncan Coutts at 2026-03-09T12:08:35-04:00
Apply NOINLINE pragmas to generated Typeable bindings
For context, see the existing Note [Grand plan for Typeable]
and the Note [NOINLINE on generated Typeable bindings] added in the
subsequent commit.
This is about reducing the number of exported top level names and
unfoldings, which reduces interface file sizes and reduces the number of
global/dynamic linker symbols.
Also accept the changed test output and metric decreases.
Tests that record the phase output for type checking or for simplifier
end up with different output: the generated bindings now have an
Inline [~] annotation, and many top level names are now local rather
than module-prefixed for export.
Also accept the numerous metric decreases in compile_time/bytes
allocated, and a few in compile_time/max_bytes_used.
There's also one instance of a decrease in runtime/max_bytes_used but
it's a ghci-way test and so presumably the reason is that it loads
smaller .hi files and/or links fewer symbols.
-------------------------
Metric Decrease:
CoOpt_Singletons
MultiLayerModulesTH_OneShot
MultilineStringsPerf
T10421
T10547
T12150
T12227
T12234
T12425
T13035
T13056
T13253
T13253-spj
T15304
T15703
T16875
T17836b
T17977b
T18140
T18223
T18282
T18304
T18698a
T18698b
T18730
T18923
T20049
T21839c
T24471
T24582
T24984
T3064
T4029
T5030
T5642
T5837
T6048
T9020
T9198
T9961
TcPlugin_RewritePerf
WWRec
hard_hole_fits
mhu-perf
-------------------------
- - - - -
67df5161 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Add documentation Note [NOINLINE on generated Typeable bindings]
and refer to it from the code and existing documentation.
- - - - -
c4ad6167 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Switch existing note to "named wrinkle" style, (GPT1)..(GPT7)
GPT = Grand plan for Typeable
- - - - -
dc84f8e2 by Cheng Shao at 2026-03-09T12:09:21-04:00
ci: only build deb13 for validate pipeline aarch64-linux jobs
This patch drops the redundant aarch64-linux deb12 job from validate pipelines
and only keeps deb13; it's still built in nightly/release pipelines. Closes #27004.
- - - - -
23a50772 by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00
chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad
Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to
GHC.Internal.TH.Monad and delete the Quote module.
Update submodule template-haskell-quasiquoter to use the merged
upstream version that imports from the correct module.
Co-authored-by: Cursor <cursoragent(a)cursor.com>
- - - - -
a2bb6fc3 by Simon Jakobi at 2026-03-10T14:12:23-04:00
Add regression test for #16122
- - - - -
604e1180 by Cheng Shao at 2026-03-11T15:00:42-04:00
hadrian: remove the broken bench flavour
This patch removes the bench flavour from hadrian which has been
broken for years and not used for actual benchmarking (for which
`perf`/`release` is used instead). Closes #26825.
- - - - -
c3e64915 by Simon Jakobi at 2026-03-11T15:01:31-04:00
Add regression test for #18186
The original TypeInType language extension is replaced with
DataKinds+PolyKinds for compatibility.
Closes #18186.
- - - - -
664996c7 by Andreas Klebinger at 2026-03-11T15:02:16-04:00
Bump nofib submodule.
We accrued a number of nofib fixes we want to have here.
- - - - -
517cf64e by Simon Jakobi at 2026-03-11T15:03:03-04:00
Add regression test for #15907
Closes #15907.
- - - - -
fff362cf by Simon Jakobi at 2026-03-11T15:03:49-04:00
Ensure T14272 is run in optasm way
Closes #16539.
- - - - -
ec81ec2c by Simon Jakobi at 2026-03-11T15:03:49-04:00
Add regression test for #24632
Closes #24632.
- - - - -
cefec47b by Simon Jakobi at 2026-03-11T15:03:50-04:00
Fix module name of T9675: T6975 -> T9675
- - - - -
d3690ae8 by Andreas Klebinger at 2026-03-11T15:04:31-04:00
User guide: Clarify phase control on INLINEABLE[foo] pragmas.
Fixes #26851
- - - - -
e7054934 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12694
Closes #12694.
- - - - -
4756d9f6 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #16275
Closes #16275.
- - - - -
34b7e2c1 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14908
Closes #14908.
- - - - -
4243db3d by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14151
Closes #14151.
- - - - -
0e9f1453 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12640
Closes #12640.
- - - - -
ae606c7f by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #15588
Closes #15588.
- - - - -
5a38ce4e by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #9445
Closes #9445.
- - - - -
d054b467 by Cheng Shao at 2026-03-11T15:05:59-04:00
compiler: implement string interning logic for BCONPtrFS
This patch adds a `FastStringEnv`-based cache of `MallocStrings`
requests to `Interp`, so that when we load bytecode with many
breakpoints that share the same module names & unit ids, we reuse the
allocated remote pointers instead of issuing duplicte `MallocStrings`
requests and bloating the C heap. Closes #26995.
- - - - -
b85a0293 by Simon Jakobi at 2026-03-11T15:06:41-04:00
Add perf test for #1216
Closes #1216.
- - - - -
cd7f7420 by Sylvain Henry at 2026-03-11T15:07:58-04:00
JS: check that tuple constructors are linked (#23709)
Test js-mk_tup was failing before because tuple constructors weren't
linked in. It's no longer an issue after the linker fixes.
- - - - -
d57f01a4 by Matthew Pickering at 2026-03-11T15:08:40-04:00
testsuite: Add test for foreign import prim with unboxed tuple return
This commit just adds a test that foreign import prim works with unboxed
sums.
- - - - -
23d111ce by Matthew Pickering at 2026-03-11T15:08:41-04:00
Return a valid pointer in advanceStackFrameLocationzh
When there is no next stack chunk, `advanceStackFrameLocationzh` used to
return NULL in the pointer-typed StackSnapshot# result slot.
Even though the caller treats that case as "no next frame", the result is
still materialized in a GC-visible pointer slot. If a GC observes the raw
NULL there, stack decoding can crash.
Fix this by ensuring the dead pointer slot contains a valid closure
pointer. Also make the optional result explicit by returning an unboxed
sum instead of a tuple with a separate tag.
Fixes #27009
- - - - -
4c58a3ae by Cheng Shao at 2026-03-11T15:09:22-04:00
hadrian: build profiled dynamic objects with -dynamic-too
This patch enables hadrian to build profiled dynamic objects with
`-dynamic-too`, addressing a build parallelism bottleneck in release
pipelines. Closes #27010.
- - - - -
f545f394 by fendor at 2026-03-12T09:35:37+01:00
Record `LinkableUsage` instead of `Linkable` in `LoaderState`
Retaining a ByteCode `Linkable` after it has been loaded retains its
`UnlinkedBCO`, keeping it alive for the remainder of the program.
This starts accumulating a lot of `UnlinkedBCO` and memory over time.
However, the `Linkable` is merely used to later record its usage in
`mkObjectUsage`, which is used for recompilation checking.
However, this is incorrect, as the interface file and bytecode objects
could be in different states, e.g. the interface changes, but the
bytecode library hasn't changed so we don't need to recompile and vice
versa.
By computing a `Fingerprint` for the `ModuleByteCode`, and recording it
in the `LinkableUsage`, we know precisely whether the `ByteCode` object
on disk is outdated.
Thus, parts of this commit just makes sure that we efficiently compute a
`Fingerprint` for `ModuleByteCode` and store it in the on-disk
representation of `ModuleByteCode`.
We change the `LoaderState` to retain `LinkableUsage`, which is smaller
representation of a `Linkable`. This allows us to free the unneeded
fields of `Linkable` after linking them.
We declare the following memory invariants that this commit implements:
* No `LinkablePart` should be retained from `LoaderState`.
* `Linkable`s should be unloaded after they have been loaded.
These invariants are unfortunately tricky to automatically uphold, so we
are simply documenting our assumptions for now.
-------------------------
Metric Increase:
MultiLayerModulesTH_OneShot
-------------------------
We allocate a bit more, but the peak number of bytes doesn't change.
While a bit unfortunate, accepting the metric increase.
We add multiple new performance measurements where we were able to
observe the desired memory invariants. Further, we add regression tests
to validate that the recompilation checker behaves more correct than
before.
- - - - -
256 changed files:
- .gitlab-ci.yml
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Builtin/primops.txt.pp
- + compiler/GHC/ByteCode/Binary.hs
- compiler/GHC/ByteCode/Linker.hs
- + compiler/GHC/ByteCode/Recomp/Binary.hs
- compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToAsm/X86/Ppr.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/Driver/Hooks.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Recomp/Types.hs
- compiler/GHC/Linker/ByteCode.hs
- compiler/GHC/Linker/Deps.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Linker/Types.hs
- compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/Tc/Gen/Foreign.hs
- compiler/GHC/Tc/Instance/Typeable.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Unit/Home/ModInfo.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/Status.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Error.hs
- compiler/ghc.cabal.in
- docs/users_guide/exts/pragmas.rst
- docs/users_guide/exts/rewrite_rules.rst
- docs/users_guide/using-optimisation.rst
- ghc/GHCi/Leak.hs
- hadrian/README.md
- hadrian/bootstrap/generate_bootstrap_plans
- hadrian/bootstrap/plan-9_10_1.json
- hadrian/bootstrap/plan-9_10_2.json
- + hadrian/bootstrap/plan-9_10_3.json
- hadrian/bootstrap/plan-bootstrap-9_10_1.json
- hadrian/bootstrap/plan-bootstrap-9_10_2.json
- + hadrian/bootstrap/plan-bootstrap-9_10_3.json
- hadrian/doc/flavours.md
- hadrian/hadrian.cabal
- hadrian/src/CommandLine.hs
- hadrian/src/Main.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/GenPrimopCode.hs
- hadrian/src/Settings/Builders/Ghc.hs
- − hadrian/src/Settings/Flavours/Benchmark.hs
- libraries/base/changelog.md
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- libraries/base/src/GHC/ResponseFile.hs
- libraries/base/src/GHC/Unicode.hs
- libraries/base/src/System/Exit.hs
- libraries/base/src/System/IO/OS.hs
- libraries/base/src/System/Info.hs
- libraries/base/tests/IO/T18832.hs
- libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
- libraries/ghc-experimental/CHANGELOG.md
- libraries/ghc-heap/GHC/Exts/Heap/Closures.hs
- libraries/ghc-internal/cbits/Stack.cmm
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Version.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/ManagedThreadPool.hs
- libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs
- libraries/ghc-internal/src/GHC/Internal/GHCi/Helpers.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs
- + libraries/ghc-internal/src/GHC/Internal/Prim.hs
- − libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs
- libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
- − libraries/ghc-internal/src/GHC/Internal/System/Exit.hs
- − libraries/ghc-internal/src/GHC/Internal/System/IO/OS.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
- − libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Version.hs
- libraries/ghc-internal/tools/ucd2haskell/exe/UCD2Haskell/ModuleGenerators.hs
- libraries/template-haskell-quasiquoter
- libraries/template-haskell/Language/Haskell/TH/Syntax.hs
- nofib
- rts/Linker.c
- rts/LinkerInternals.h
- rts/PrimOps.cmm
- rts/RtsSymbols.c
- rts/Threads.c
- rts/Threads.h
- rts/include/rts/Threads.h
- rts/include/stg/MiscClosures.h
- rts/linker/Elf.c
- rts/linker/MachO.c
- rts/linker/PEi386.c
- testsuite/driver/perf_notes.py
- + testsuite/ghc-config/ghc-config
- + testsuite/tests/bytecode/TLinkable/BCOTemplate.hs
- + testsuite/tests/bytecode/TLinkable/LinkableUsage01.stderr
- + testsuite/tests/bytecode/TLinkable/Makefile
- + testsuite/tests/bytecode/TLinkable/all.T
- + testsuite/tests/bytecode/TLinkable/genLinkables.sh
- + testsuite/tests/bytecode/TLinkable/linkable_bytecodelib.stdout
- + testsuite/tests/corelint/T15907.hs
- + testsuite/tests/corelint/T15907A.hs
- testsuite/tests/corelint/all.T
- testsuite/tests/count-deps/CountDepsAst.stdout
- testsuite/tests/count-deps/CountDepsParser.stdout
- testsuite/tests/deSugar/should_compile/T16615.stderr
- testsuite/tests/deSugar/should_compile/T2431.stderr
- + testsuite/tests/dependent/should_fail/T15588.hs
- + testsuite/tests/dependent/should_fail/T15588.stderr
- testsuite/tests/dependent/should_fail/all.T
- testsuite/tests/dmdanal/should_compile/T16029.stdout
- testsuite/tests/driver/multipleHomeUnits/multipleHomeUnits_recomp_th.stdout
- testsuite/tests/ffi/should_compile/all.T
- + testsuite/tests/ffi/should_run/PrimFFIUnboxedSum.hs
- + testsuite/tests/ffi/should_run/PrimFFIUnboxedSum.stdout
- + testsuite/tests/ffi/should_run/PrimFFIUnboxedSum_cmm.cmm
- testsuite/tests/ffi/should_run/all.T
- + testsuite/tests/ghci-wasm/T26998.hs
- testsuite/tests/ghci-wasm/all.T
- + testsuite/tests/ghci/scripts/T24632.hs
- + testsuite/tests/ghci/scripts/T24632.script
- + testsuite/tests/ghci/scripts/T24632.stdout
- testsuite/tests/ghci/scripts/all.T
- testsuite/tests/ghci/should_run/all.T
- testsuite/tests/interface-stability/ghc-experimental-exports.stdout
- testsuite/tests/interface-stability/ghc-experimental-exports.stdout-mingw32
- testsuite/tests/interface-stability/ghc-prim-exports.stdout
- testsuite/tests/interface-stability/ghc-prim-exports.stdout-mingw32
- + testsuite/tests/javascript/T24886.hs
- + testsuite/tests/javascript/T24886.stderr
- + testsuite/tests/javascript/T24886.stdout
- testsuite/tests/javascript/all.T
- testsuite/tests/javascript/js-mk_tup.hs
- testsuite/tests/javascript/js-mk_tup.stdout
- testsuite/tests/linters/Makefile
- testsuite/tests/numeric/should_compile/T14170.stdout
- testsuite/tests/numeric/should_compile/T14465.stdout
- testsuite/tests/numeric/should_compile/T7116.stdout
- testsuite/tests/numeric/should_run/all.T
- testsuite/tests/overloadedrecflds/should_compile/all.T
- testsuite/tests/overloadedrecflds/should_run/all.T
- testsuite/tests/perf/compiler/T9675.hs
- + testsuite/tests/perf/should_run/T1216.hs
- + testsuite/tests/perf/should_run/T1216.stdout
- testsuite/tests/perf/should_run/all.T
- testsuite/tests/plugins/plugins10.stdout
- testsuite/tests/pmcheck/should_compile/T11303.hs
- + testsuite/tests/polykinds/T18186.hs
- + testsuite/tests/polykinds/T18186.stderr
- testsuite/tests/polykinds/all.T
- testsuite/tests/quasiquotation/qq005/test.T
- testsuite/tests/quasiquotation/qq006/test.T
- testsuite/tests/quotes/QQError.stderr
- testsuite/tests/roles/should_compile/Roles1.stderr
- testsuite/tests/roles/should_compile/Roles13.stderr
- testsuite/tests/roles/should_compile/Roles14.stderr
- testsuite/tests/roles/should_compile/Roles2.stderr
- testsuite/tests/roles/should_compile/Roles3.stderr
- testsuite/tests/roles/should_compile/Roles4.stderr
- testsuite/tests/roles/should_compile/T8958.stderr
- testsuite/tests/rts/linker/Makefile
- + testsuite/tests/rts/linker/T6107.hs
- + testsuite/tests/rts/linker/T6107.stdout
- + testsuite/tests/rts/linker/T6107_sym1.s
- + testsuite/tests/rts/linker/T6107_sym2.s
- testsuite/tests/rts/linker/all.T
- testsuite/tests/saks/should_compile/all.T
- testsuite/tests/showIface/all.T
- testsuite/tests/simd/should_run/doublex2_arith.hs
- testsuite/tests/simd/should_run/doublex2_arith.stdout
- testsuite/tests/simd/should_run/doublex2_arith_baseline.hs
- testsuite/tests/simd/should_run/doublex2_arith_baseline.stdout
- testsuite/tests/simd/should_run/floatx4_arith.hs
- testsuite/tests/simd/should_run/floatx4_arith.stdout
- testsuite/tests/simd/should_run/floatx4_arith_baseline.hs
- testsuite/tests/simd/should_run/floatx4_arith_baseline.stdout
- testsuite/tests/simd/should_run/int16x8_arith.hs
- testsuite/tests/simd/should_run/int16x8_arith.stdout
- testsuite/tests/simd/should_run/int16x8_arith_baseline.hs
- testsuite/tests/simd/should_run/int16x8_arith_baseline.stdout
- testsuite/tests/simd/should_run/int32x4_arith.hs
- testsuite/tests/simd/should_run/int32x4_arith.stdout
- testsuite/tests/simd/should_run/int32x4_arith_baseline.hs
- testsuite/tests/simd/should_run/int32x4_arith_baseline.stdout
- testsuite/tests/simd/should_run/int64x2_arith.hs
- testsuite/tests/simd/should_run/int64x2_arith.stdout
- testsuite/tests/simd/should_run/int64x2_arith_baseline.hs
- testsuite/tests/simd/should_run/int64x2_arith_baseline.stdout
- testsuite/tests/simd/should_run/int8x16_arith.hs
- testsuite/tests/simd/should_run/int8x16_arith.stdout
- testsuite/tests/simd/should_run/int8x16_arith_baseline.hs
- testsuite/tests/simd/should_run/int8x16_arith_baseline.stdout
- testsuite/tests/simplCore/should_compile/OpaqueNoCastWW.stderr
- + testsuite/tests/simplCore/should_compile/T12640.hs
- + testsuite/tests/simplCore/should_compile/T12640.stderr
- + testsuite/tests/simplCore/should_compile/T14908.hs
- + testsuite/tests/simplCore/should_compile/T14908_Deps.hs
- + testsuite/tests/simplCore/should_compile/T16122.hs
- + testsuite/tests/simplCore/should_compile/T16122.stderr
- testsuite/tests/simplCore/should_compile/T3717.stderr
- testsuite/tests/simplCore/should_compile/T3772.stdout
- testsuite/tests/simplCore/should_compile/T4908.stderr
- testsuite/tests/simplCore/should_compile/T4930.stderr
- testsuite/tests/simplCore/should_compile/T7360.stderr
- testsuite/tests/simplCore/should_compile/T8274.stdout
- testsuite/tests/simplCore/should_compile/T9400.stderr
- + testsuite/tests/simplCore/should_compile/T9445.hs
- testsuite/tests/simplCore/should_compile/all.T
- testsuite/tests/simplCore/should_compile/noinline01.stderr
- testsuite/tests/simplCore/should_compile/par01.stderr
- testsuite/tests/th/QQTopError.stderr
- testsuite/tests/th/TH_Roles2.stderr
- testsuite/tests/th/all.T
- testsuite/tests/typecheck/should_compile/T13032.stderr
- + testsuite/tests/typecheck/should_compile/T14151.hs
- testsuite/tests/typecheck/should_compile/T18406b.stderr
- testsuite/tests/typecheck/should_compile/T18529.stderr
- testsuite/tests/typecheck/should_compile/all.T
- + testsuite/tests/typecheck/should_fail/T12694.hs
- + testsuite/tests/typecheck/should_fail/T12694.stderr
- + testsuite/tests/typecheck/should_fail/T16275.stderr
- + testsuite/tests/typecheck/should_fail/T16275A.hs
- + testsuite/tests/typecheck/should_fail/T16275B.hs
- + testsuite/tests/typecheck/should_fail/T16275B.hs-boot
- testsuite/tests/typecheck/should_fail/all.T
- testsuite/tests/vdq-rta/should_compile/all.T
- utils/genprimopcode/Main.hs
The diff was not included because it is too large.
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[Git][ghc/ghc][wip/26416] DmdAnal: Take stable unfoldings into account when determining argument demands
by Zubin (＠wz1000) 12 Mar '26
by Zubin (＠wz1000) 12 Mar '26
12 Mar '26
Zubin pushed to branch wip/26416 at Glasgow Haskell Compiler / GHC
Commits:
14b0c2ee by Zubin Duggal at 2026-03-12T14:31:01+05:30
DmdAnal: Take stable unfoldings into account when determining argument demands
Previously, demand analysis only looked at the RHS to compute argument demands.
If the optimised RHS discarded uses of an argument that the stable unfolding
still needed, it would be incorrectly marked absent. Worker/wrapper would then
replace it with LitRubbish, and inlining the stable unfolding would use the
rubbish value, causing a segfault.
To fix, we introduce addUnfoldingDemands which analyses the stable unfolding
with dmdAnal and combines its DmdType with the RHS's via the new `maxDmdType`
which combines the demands of the stable unfolding with the rhs, so we can avoid
any situation where we give an absent demand to something which is still used
by the stable unfolding.
Fixes #26416.
- - - - -
8 changed files:
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Types/Demand.hs
- testsuite/tests/dmdanal/should_compile/T18894.stderr
- + testsuite/tests/dmdanal/should_run/M1.hs
- + testsuite/tests/dmdanal/should_run/T26416.hs
- + testsuite/tests/dmdanal/should_run/T26416.stdout
- testsuite/tests/dmdanal/should_run/all.T
- testsuite/tests/dmdanal/sigs/T21081.stderr
Changes:
=====================================
compiler/GHC/Core/Opt/DmdAnal.hs
=====================================
@@ -23,7 +23,7 @@ import GHC.Core.DataCon
import GHC.Core.Utils
import GHC.Core.TyCon
import GHC.Core.Type
-import GHC.Core.FVs ( rulesRhsFreeIds, bndrRuleAndUnfoldingIds )
+import GHC.Core.FVs ( rulesRhsFreeIds, bndrRuleAndUnfoldingIds, idRuleVars )
import GHC.Core.Coercion ( Coercion )
import GHC.Core.TyCo.FVs ( coVarsOfCos )
import GHC.Core.TyCo.Compare ( eqType )
@@ -1106,9 +1106,13 @@ dmdAnalRhsSig top_lvl rec_flag env let_sd id rhs
rhs_sd = mkCalledOnceDmds ww_arity adjusted_body_sd
WithDmdType rhs_dmd_ty rhs' = dmdAnal env rhs_sd rhs
- DmdType rhs_env rhs_dmds = rhs_dmd_ty
+
+ -- See Note [Absence analysis for stable unfoldings and RULES], Wrinkle (W3)
+ full_dmd_ty = addUnfoldingDemands env rhs_sd id rhs_dmd_ty
+ DmdType full_rhs_env combined_rhs_dmds = full_dmd_ty
+
(final_rhs_dmds, final_rhs) = finaliseArgBoxities env id ww_arity
- rhs_dmds (de_div rhs_env) rhs'
+ combined_rhs_dmds (de_div full_rhs_env) rhs'
dmd_sig_arity = ww_arity + strictCallArity body_sd
sig = mkDmdSigForArity dmd_sig_arity (DmdType sig_env final_rhs_dmds)
@@ -1132,11 +1136,13 @@ dmdAnalRhsSig top_lvl rec_flag env let_sd id rhs
-- we never get used-once info for FVs of recursive functions.
-- See #14816 where we try to get rid of reuseEnv.
rhs_env1 = case rec_flag of
- Recursive -> reuseEnv rhs_env
- NonRecursive -> rhs_env
+ Recursive -> reuseEnv full_rhs_env
+ NonRecursive -> full_rhs_env
-- See Note [Absence analysis for stable unfoldings and RULES]
- rhs_env2 = rhs_env1 `plusDmdEnv` demandRootSet env (bndrRuleAndUnfoldingIds id)
+ -- The unfolding FVs are already included in full_rhs_env via addUnfoldingDemands.
+ -- Here we only need demandRoots for RULES.
+ rhs_env2 = rhs_env1 `plusDmdEnv` demandRootSet env (filterVarSet isId (idRuleVars id))
-- See Note [Lazy and unleashable free variables]
!(!sig_env, !weak_fvs) = splitWeakDmds rhs_env2
@@ -1145,6 +1151,23 @@ splitWeakDmds :: DmdEnv -> (DmdEnv, WeakDmds)
splitWeakDmds (DE fvs div) = (DE sig_fvs div, weak_fvs)
where (!weak_fvs, !sig_fvs) = partitionVarEnv isWeakDmd fvs
+-- | If there is a stable unfolding, combine argument demands and free variable
+-- demands from the unfolding with those from the RHS.
+-- See Note [Absence analysis for stable unfoldings and RULES], Wrinkle (W3).
+-- See Note [Combining demands for stable unfoldings] in GHC.Types.Demand.
+addUnfoldingDemands :: AnalEnv -> SubDemand -> Id -> DmdType -> DmdType
+addUnfoldingDemands env rhs_sd id rhs_dmd_ty
+ | isStableUnfolding unf
+ , Just unf_body <- maybeUnfoldingTemplate unf
+ , let WithDmdType unf_dmd_ty _ = dmdAnal env rhs_sd unf_body
+ = -- pprTrace "addUnfoldingDemands" (ppr id $$ ppr rhs_dmd_ty $$ ppr unf_dmd_ty) $
+ maxDmdType rhs_dmd_ty unf_dmd_ty
+
+ | otherwise
+ = rhs_dmd_ty -- No stable unfolding, nothing to do
+ where
+ unf = realIdUnfolding id
+
-- | The result type after applying 'idArity' many arguments. Returns 'Nothing'
-- when the type doesn't have exactly 'idArity' many arrows.
resultType_maybe :: Id -> Maybe Type
@@ -1482,10 +1505,21 @@ and transform to
Now if f is subsequently inlined, we'll use 'g' and ... disaster.
-SOLUTION: if f has a stable unfolding, treat every free variable as a
-/demand root/, that is: Analyse it as if it was a variable occurring in a
+SOLUTION for stable unfoldings: in `dmdAnalRhsSig`, if the function has a
+stable unfolding, analyse it with `dmdAnal` and combine the resulting `DmdType`
+with the RHS's `DmdType`. This is done by `addUnfoldingDemands`, which uses
+`maxDmdType` to combine both argument demands and free variable demands.
+See Note [Combining demands for stable unfoldings] in GHC.Types.Demand for
+details of the combining operation.
+
+This handles both the free variables and arguments of stable unfoldings in one
+go. For example, in the scenario above, the unfolding's `DmdType` will mention
+`g` as a free variable, so `maxDmdType` will keep it alive.
+
+SOLUTION for RULES: treat every Id free in the RHS of a RULE as a
+/demand root/, that is: analyse it as if it was a variable occurring in a
'topDmd' context. This is done in `demandRoot` (which we also use for exported
-top-level ids). Do the same for Ids free in the RHS of any RULES for f.
+top-level ids).
Wrinkles:
@@ -1502,7 +1536,7 @@ Wrinkles:
this, that actually happened in practice.
(W2) You might wonder why we don't simply take the free vars of the
- unfolding/RULE and map them to topDmd. The reason is that any of the free vars
+ RULE and map them to topDmd. The reason is that any of the free vars
might have demand signatures themselves that in turn demand transitive free
variables and that we hence need to unleash! This came up in #23208.
Consider
@@ -1524,6 +1558,24 @@ Wrinkles:
for `sg`, failing to unleash the signature and hence observed an absent
error instead of the `really important message`.
+ (W3) The stable unfolding solution above handles /free variables/, but
+ what about /arguments/? Consider (#26416)
+
+ fromVector :: (Storable a, KnownNat n) => Vector a -> Vector a
+ fromVector v = ... (uses Storable dictionary) ...
+ {-# INLINABLE fromVector #-}
+
+ Suppose that the optimised RHS of `fromVector` somehow discards the use of
+ the Storable dictionary, but the stable unfolding still uses it. Then the
+ demand signature will say that the Storable dictionary argument is absent,
+ and worker/wrapper will replace it with `LitRubbish`. But when the
+ worker's unfolding is inlined, it will use that rubbish value as a real
+ dictionary, leading to a segfault!
+
+ `addUnfoldingDemands` handles this too: since `maxDmdType` combines both
+ the argument demands and free variable demands from the unfolding's
+ `DmdType` with the RHS's, argument absence is correctly prevented.
+
Note [DmdAnal for DataCon wrappers]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We give DataCon wrappers a (necessarily flat) demand signature in
@@ -2006,8 +2058,15 @@ finaliseArgBoxities :: AnalEnv -> Id -> Arity
-- If: (dmds', rhs') = finaliseArgBoxitities ... dmds .. rhs
-- Then:
-- dmds' is the same as dmds (including length), except for boxity info
--- rhs' is the same as rhs, except for dmd info on lambda binders
+-- rhs' is the same as rhs, except that the idDemandInfo on the outer
+-- lambda binders now includes the same finalised boxity info as dmds'
-- NB: For join points, length dmds might be greater than ww_arity
+--
+-- IMPORTANT: The lambda binders of rhs' must carry the final demand info,
+-- because worker/wrapper drives decisions from the idDemandInfo on the lambdas
+-- (see mkWwstr_one), NOT from the strictness signature of the function.
+-- So the demands must reflect both the unfolding combination (from
+-- addUnfoldingDemands) and the boxity finalisation done here.
finaliseArgBoxities env fn ww_arity arg_dmds div rhs
-- Check for an OPAQUE function: see Note [OPAQUE pragma]
@@ -2047,8 +2106,11 @@ finaliseArgBoxities env fn ww_arity arg_dmds div rhs
arg_triples :: [(Type, StrictnessMark, Demand)]
arg_triples = take ww_arity $
- [ (idType bndr, NotMarkedStrict, get_dmd bndr)
- | bndr <- bndrs, isRuntimeVar bndr ]
+ zipWith mk_triple
+ [ bndr | bndr <- bndrs, isRuntimeVar bndr ]
+ arg_dmds
+ where
+ mk_triple bndr arg_dmd = (idType bndr, NotMarkedStrict, get_dmd arg_dmd)
arg_dmds' = ww_arg_dmds ++ map trimBoxity (drop ww_arity arg_dmds)
-- If ww_arity < length arg_dmds, the leftover ones
@@ -2064,12 +2126,10 @@ finaliseArgBoxities env fn ww_arity arg_dmds div rhs
-- This is the budget initialisation step of
-- Note [Worker argument budget]
- get_dmd :: Id -> Demand
- get_dmd bndr
+ get_dmd :: Demand -> Demand
+ get_dmd dmd
| is_bot_fn = unboxDeeplyDmd dmd -- See Note [Boxity for bottoming functions],
| otherwise = dmd -- case (B)
- where
- dmd = idDemandInfo bndr
-- is_bot_fn: see Note [Boxity for bottoming functions]
is_bot_fn = div == botDiv
=====================================
compiler/GHC/Types/Demand.hs
=====================================
@@ -23,6 +23,8 @@ module GHC.Types.Demand (
lubCard, lubDmd, lubSubDmd,
-- *** Greatest lower bound
glbCard,
+ -- *** Maximum (glb on strictness, lub on usage)
+ maxCard, maxDmd,
-- *** Plus
plusCard, plusDmd, plusSubDmd,
-- *** Multiply
@@ -49,13 +51,13 @@ module GHC.Types.Demand (
-- * Demand environments
DmdEnv(..), addVarDmdEnv, mkTermDmdEnv, nopDmdEnv, plusDmdEnv, plusDmdEnvs,
- multDmdEnv, reuseEnv,
+ lubDmdEnv, multDmdEnv, reuseEnv,
-- * Demand types
DmdType(..), dmdTypeDepth,
-- ** Algebra
nopDmdType, botDmdType,
- lubDmdType, plusDmdType, multDmdType, discardArgDmds,
+ lubDmdType, maxDmdType, plusDmdType, multDmdType, discardArgDmds,
-- ** Other operations
peelFV, findIdDemand, addDemand, splitDmdTy, deferAfterPreciseException,
@@ -864,6 +866,80 @@ lubSubDmd sd1@Poly{} sd2 = lubSubDmd sd2 sd1
-- Otherwise (Call `lub` Prod) return Top
lubSubDmd _ _ = topSubDmd
+{- Note [Combining demands for stable unfoldings]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+When a function has a stable unfolding, the optimised RHS and the unfolding
+may have different demand signatures for the same arguments. This can happen
+because:
+
+ * The optimised RHS may have had transformations applied that reveal
+ strictness (e.g., inlining exposes a case on an argument).
+
+ * The optimised RHS may have had transformations applied that drop usage
+ (e.g., a rewrite rule fires that doesn't use an argument, or a seq on
+ a dictionary is dropped because dictionaries are known to terminate).
+
+When we inline the stable unfolding at a call site, we get the unfolding's
+behaviour, not the RHS's. So we must be conservative and combine the demands:
+
+ * For strictness (lower bounds): we can take the MAXIMUM (glb).
+ If the RHS reveals that an argument is strict, that strictness was
+ always there semantically - the analysis just couldn't see it in the
+ unfolding. Sound optimisations never make lazy code strict.
+
+ * For usage (upper bounds): we must take the MAXIMUM (lub).
+ If the unfolding uses an argument but the RHS doesn't, we must not
+ mark it absent, or we'll replace it with rubbish that the unfolding
+ will then try to use, causing a segfault. See #26416.
+
+So for cardinality bounds [l1..u1] from RHS and [l2..u2] from unfolding,
+we compute [max(l1,l2)..max(u1,u2)].
+
+See Note [Absence analysis for stable unfoldings and RULES] in GHC.Core.Opt.DmdAnal
+for the broader context.
+-}
+
+-- | Takes the maximum of both the lower and upper bound of two 'Card's.
+-- Semantically, this is glb on lower (strictness) and lub on upper (usage).
+-- See Note [Combining demands for stable unfoldings].
+maxCard :: Card -> Card -> Card
+-- Given Note [Bit vector representation for Card]:
+-- * bit 0 (strictness): take AND (glb) - 0 means strict, so 0 wins
+-- * bits 1,2 (usage): take OR (lub) - if either uses, result uses
+maxCard (Card a) (Card b) = Card ((a .&. b .&. 0b001) .|. ((a .|. b) .&. 0b110))
+
+-- | Takes the maximum of both the lower and upper bounds of two 'Demand's.
+-- Semantically, glb on lower (strictness) and lub on upper (usage).
+-- See Note [Combining demands for stable unfoldings].
+maxDmd :: Demand -> Demand -> Demand
+maxDmd BotDmd dmd2 = dmd2
+maxDmd dmd1 BotDmd = dmd1
+maxDmd (n1 :* sd1) (n2 :* sd2) =
+ maxCard n1 n2 :* maxSubDmd sd1 sd2
+
+maxSubDmd :: SubDemand -> SubDemand -> SubDemand
+-- Shortcuts for neutral and absorbing elements.
+maxSubDmd (Poly Unboxed C_00) sd = sd
+maxSubDmd sd (Poly Unboxed C_00) = sd
+maxSubDmd sd@(Poly Boxed C_1N) _ = sd
+maxSubDmd _ sd@(Poly Boxed C_1N) = sd
+-- Prod
+maxSubDmd (Prod b1 ds1) (Poly b2 n2)
+ | let !d = polyFieldDmd b2 n2
+ = mkProd (lubBoxity b1 b2) (strictMap (maxDmd d) ds1)
+maxSubDmd (Prod b1 ds1) (Prod b2 ds2)
+ | equalLength ds1 ds2
+ = mkProd (lubBoxity b1 b2) (strictZipWith maxDmd ds1 ds2)
+-- Handle Call
+maxSubDmd (Call n1 sd1) (viewCall -> Just (n2, sd2)) =
+ mkCall (maxCard n1 n2) (maxSubDmd sd1 sd2)
+-- Handle Poly
+maxSubDmd (Poly b1 n1) (Poly b2 n2) = Poly (lubBoxity b1 b2) (maxCard n1 n2)
+-- Other Poly case by commutativity
+maxSubDmd sd1@Poly{} sd2 = maxSubDmd sd2 sd1
+-- Otherwise (Call `max` Prod) return Top
+maxSubDmd _ _ = topSubDmd
+
-- | Denotes '+' on 'Demand'.
plusDmd :: Demand -> Demand -> Demand
plusDmd AbsDmd dmd2 = dmd2
@@ -1834,6 +1910,26 @@ lubDmdType d1 d2 = DmdType lub_fv lub_ds
lub_ds = zipWithEqual lubDmd ds1 ds2
lub_fv = lubDmdEnv fv1 fv2
+-- | Combine two 'DmdType's for stable unfolding analysis.
+-- See Note [Combining demands for stable unfoldings].
+maxDmdType :: DmdType -> DmdType -> DmdType
+maxDmdType (DmdType fv1 ds1) (DmdType fv2 ds2)
+ = DmdType combined_fv combined_ds
+ where
+ combined_fv = maxDmdEnv fv1 fv2
+ combined_ds = go ds1 ds2
+ -- If lists have different lengths, keep remaining ds1 (from RHS)
+ go rhs [] = rhs
+ go [] _ = []
+ go (r:rhs) (u:unfs) = maxDmd r u : go rhs unfs
+
+-- | See Note [Combining demands for stable unfoldings].
+maxDmdEnv :: DmdEnv -> DmdEnv -> DmdEnv
+maxDmdEnv (DE fv1 d1) (DE fv2 d2) = DE combined_fv combined_div
+ where
+ combined_fv = plusVarEnv_CD maxDmd fv1 (defaultFvDmd d1) fv2 (defaultFvDmd d2)
+ combined_div = lubDivergence d1 d2
+
discardArgDmds :: DmdType -> DmdEnv
discardArgDmds (DmdType fv _) = fv
=====================================
testsuite/tests/dmdanal/should_compile/T18894.stderr
=====================================
@@ -399,7 +399,8 @@ lvl :: (Int, Int)
lvl = case $wg1 2# of { (# ww, ww #) -> (GHC.Types.I# ww, ww) }
-- RHS size: {terms: 22, types: 16, coercions: 0, joins: 0/0}
-$wh1 [InlPrag=[2]] :: GHC.Prim.Int# -> Int
+$wh1 [InlPrag=[2], Dmd=LC(S,!P(L))]
+ :: GHC.Prim.Int# -> Int
[LclId[StrictWorker([])],
Arity=1,
Str=<1L>,
=====================================
testsuite/tests/dmdanal/should_run/M1.hs
=====================================
@@ -0,0 +1,17 @@
+-- Short module name is essential, or else f doesn't inline
+module M1 where
+{-# INLINABLE [2] f #-}
+f :: Int -> Int -> Float
+f !dummy x = if times dummy 0 x == 1
+ then 3.0 else 4.0
+
+{-# INLINE [0] times #-}
+times :: Int -> Int -> Int -> Int
+times dummy 0 x = x `seq` ( 0 + big dummy )
+times _ a b = a * b
+
+{-# RULES "times" [1] forall dummy x. times dummy 0 x = 0 + big dummy #-}
+
+big :: Int -> Int
+big x = succ . succ . succ . succ . succ . succ . succ . succ . succ $ x
+{-# INLINE big #-}
=====================================
testsuite/tests/dmdanal/should_run/T26416.hs
=====================================
@@ -0,0 +1,3 @@
+module Main where
+import M1 ( f )
+main = print (f 19 12)
=====================================
testsuite/tests/dmdanal/should_run/T26416.stdout
=====================================
@@ -0,0 +1 @@
+4.0
=====================================
testsuite/tests/dmdanal/should_run/all.T
=====================================
@@ -35,3 +35,4 @@ test('T22549', normal, compile_and_run, ['-fdicts-strict -fno-specialise'])
test('T23208', exit_code(1), multimod_compile_and_run, ['T23208_Lib', 'T23208'])
test('T25439', normal, compile_and_run, [''])
test('T26748', normal, compile_and_run, [''])
+test('T26416', [extra_files(['M1.hs'])], multimod_compile_and_run, ['T26416','M1.hs'])
=====================================
testsuite/tests/dmdanal/sigs/T21081.stderr
=====================================
@@ -62,7 +62,7 @@ T21081.g: <ML>
T21081.h: <MP(ML,ML)><1!P(1L)>
T21081.h2: <L><1!P(SL)>
T21081.i: <1L><1L><MP(ML,ML)>
-T21081.j: <1!P(1L,1L)>
+T21081.j: <S!P(1L,1L)>
T21081.myfoldl: <LC(S,C(1,L))><1L><1L>
T21081.snd': <1!P(A,1L)>
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/14b0c2ee05c2030d2601d4d1a4892ec…
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/14b0c2ee05c2030d2601d4d1a4892ec…
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[Git][ghc/ghc][wip/26416] 266 commits: Add an operation `System.IO.hGetNewlineMode`
by Zubin (＠wz1000) 12 Mar '26
by Zubin (＠wz1000) 12 Mar '26
12 Mar '26
Zubin pushed to branch wip/26416 at Glasgow Haskell Compiler / GHC
Commits:
a2d52b3b by Wolfgang Jeltsch at 2025-12-23T04:47:33-05:00
Add an operation `System.IO.hGetNewlineMode`
This commit also contains some small code and documentation changes for
related operations, for the sake of consistency.
- - - - -
b26d134a by Cheng Shao at 2025-12-23T04:48:15-05:00
rts: opportunistically reclaim slop space in shrinkMutableByteArray#
Previously, `shrinkMutableByteArray#` shrinks a `MutableByteArray#`
in-place by assigning the new size to it, and zeroing the extra slop
space. That slop space is not reclaimed and wasted. But it's often the
case that we allocate a `MutableByteArray#` upfront, then shrink it
shortly after, so the `MutableByteArray#` closure sits right at the
end of a nursery block; this patch identifies such chances, and also
shrink `bd->free` if possible, reducing heap space fragmentation.
Co-authored-by: Codex <codex(a)openai.com>
-------------------------
Metric Decrease:
T10678
-------------------------
- - - - -
c72ddabf by Cheng Shao at 2025-12-23T16:13:23-05:00
hadrian: fix bootstrapping with ghc-9.14
This patch fixes bootstrapping GHC with ghc-9.14, tested locally with
ghc-9.14.1 release as bootstrapping GHC.
- - - - -
0fd6d8e4 by Cheng Shao at 2025-12-23T16:14:05-05:00
hadrian: pass -keep-tmp-files to test ghc when --keep-test-files is enabled
This patch makes hadrian pass `-keep-tmp-files` to test ghc when
`--keep-test-files` is enabled, so you can check the ghc intermediate
files when debugging certain test failures. Closes #26688.
- - - - -
81d10134 by Cheng Shao at 2025-12-24T06:11:52-05:00
configure: remove dead code in configure scripts
This patch removes dead code in our configure scripts, including:
- Variables and auto-detected programs that are not used
- autoconf functions that are not used, or export a variable that's
not used
- `AC_CHECK_HEADERS` invocations that don't have actual corresponding
`HAVE_XXX_H` usage
- Other dead code (e.g. stray `AC_DEFUN()`)
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
fb1381c3 by Wolfgang Jeltsch at 2025-12-24T06:12:34-05:00
Remove unused known keys and names for list operations
This removes the known-key and corresponding name variables for
`concat`, `filter`, `zip`, and `(++)`, as they are apparently nowhere
used in GHC’s source code.
- - - - -
7b9c20f4 by Recursion Ninja at 2025-12-24T10:35:36-05:00
Decoupling Language.Haskell.Syntax.Binds from GHC.Types.Basic
by transferring InlinePragma types between the modules.
* Moved InlinePragma data-types to Language.Haskell.Syntax.Binds.InlinePragma
* Partitioned of Arity type synonyms to GHC.Types.Arity
* InlinePragma is now extensible via Trees That Grow
* Activation is now extensible via Trees That Grow
* Maybe Arity change to more descriptive InlineSaturation data-type
* InlineSaturation information removed from InlinePragma during GHS parsing pass
* Cleaned up the exposed module interfaces of the new modules
- - - - -
a3afae0c by Simon Peyton Jones at 2025-12-25T15:26:36-05:00
Check for rubbish literals in Lint
Addresses #26607.
See new Note [Checking for rubbish literals] in GHC.Core.Lint
- - - - -
8a317b6f by Aaron Allen at 2026-01-01T03:05:15-05:00
[#26183] Associated Type Iface Fix
When determining "extras" for class decl interface entries, axioms for
the associated types need to included so that dependent modules will be
recompiled if those axioms change.
resolves #26183
- - - - -
ae1aeaab by Cheng Shao at 2026-01-01T03:06:32-05:00
testsuite: run numeric tests with optasm when available
This patch adds the `optasm` extra way to nueric tests when NCG is
available. Some numeric bugs only surface with optimization, omitting
this can hide these bugs and even make them slip into release! (e.g. #26711)
- - - - -
6213bb57 by maralorn at 2026-01-02T16:30:32+01:00
GHC.Internal.Exception.Context: Fix comment
on addExceptionAnnotation
- - - - -
b820ff50 by Janis Voigtlaender at 2026-01-05T02:43:18-05:00
GHC.Internal.Control.Monad.replicateM: Fix comment
- - - - -
a8a94aad by Cheng Shao at 2026-01-05T16:24:04-05:00
hadrian: drops unused PE linker script for windows
This patch drops unused PE linker script for windows in the
`MergeObjects` builder of hadrian. The linker script is used for
merging object files into a single `HS*.o` object file and undoing the
effect of split sections, when building the "ghci library" object
file. However, we don't build the ghci library on windows, and this
code path is actually unreachable.
- - - - -
53038ea9 by Cheng Shao at 2026-01-05T16:24:04-05:00
hadrian: drop unused logic for building ghci libraries
This patch drops the unused logic for building ghci libraries in
hadrian:
- The term "ghci library" refers to an optional object file per
library `HS*.o`, which is merged from multiple object files in that
library using the `MergeObjects` builder in hadrian.
- The original rationale of having a ghci library object, in addition
to normal archives, was to speedup ghci loading, since the combined
object is linked with a linker script to undo the effects of
`-fsplit-sections` to reduce section count and make it easier for
the RTS linker to handle.
- However, most GHC builds enable `dynamicGhcPrograms` by default, in
such cases the ghci library would already not be built.
- `dynamicGhcPrograms` is disabled on Windows, but still we don't
build the ghci library due to lack of functioning merge objects
command.
- The only case that we actually build ghci library objects, are
alpine fully static bindists. However, for other reasons, split
sections is already disabled for fully static builds anyway!
- There will not be any regression if the ghci library objects are
absent from a GHC global libdir when `dynamicGhcPrograms` is
disabled. The RTS linker can already load the archives without any
issue.
Hence the removal. We now forcibly disable ghci libraries for all
Cabal components, and rip out all logic related to `MergeObjects` and
ghci libraries in hadrian. This also nicely cleans up some old todos
and fixmes that are no longer relevant.
Note that MergeObjects in hadrian is not the same thing as merge
objects in the GHC driver. The latter is not affected by this patch.
-------------------------
Metric Decrease:
libdir
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
8f209336 by Simon Jakobi at 2026-01-05T16:24:48-05:00
User's guide: Fix link to language extensions
Instead of linking to haddocks, it seemed more useful to link
to the extension overview in the user's guide.
Closes #26614.
- - - - -
0b7df6db by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Improved fundeps for closed type families
The big payload of this commit is to execute the plan suggested
in #23162, by improving the way that we generate functional
dependencies for closed type families.
It is all described in Note [Exploiting closed type families]
Most of the changes are in GHC.Tc.Solver.FunDeps
Other small changes
* GHC.Tc.Solver.bumpReductionDepth. This function brings together the code that
* Bumps the depth
* Checks for overflow
Previously the two were separated, sometimes quite widely.
* GHC.Core.Unify.niFixSubst: minor improvement, removing an unnecessary
itraetion in the base case.
* GHC.Core.Unify: no need to pass an InScopeSet to
tcUnifyTysForInjectivity. It can calculate one for itself; and it is
never inspected anyway so it's free to do so.
* GHC.Tc.Errors.Ppr: slight impovement to the error message for
reduction-stack overflow, when a constraint (rather than a type) is
involved.
* GHC.Tc.Solver.Monad.wrapUnifier: small change to the API
- - - - -
fde8bd88 by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Add missing (KK4) to kick-out criteria
There was a missing case in kick-out that meant we could fail
to solve an eminently-solvable constraint.
See the new notes about (KK4)
- - - - -
00082844 by Simon Peyton Jones at 2026-01-06T09:32:23-05:00
Some small refactorings of error reporting in the typechecker
This is just a tidy-up commit.
* Add ei_insoluble to ErrorItem, to cache insolubility.
Small tidy-up.
* Remove `is_ip` and `mkIPErr` from GHC.Tc.Errors; instead enhance mkDictErr
to handle implicit parameters. Small refactor.
- - - - -
fe4cb252 by Simon Peyton Jones at 2026-01-06T09:32:24-05:00
Improve recording of insolubility for fundeps
This commit addresses #22652, by recording when the fundeps for
a constraint are definitely insoluble. That in turn improves the
perspicacity of the pattern-match overlap checker.
See Note [Insoluble fundeps]
- - - - -
df0ffaa5 by Simon Peyton Jones at 2026-01-06T09:32:24-05:00
Fix a buglet in niFixSubst
The MR of which this is part failed an assertion check extendTvSubst
because we extended the TvSubst with a CoVar. Boo.
This tiny patch fixes it, and adds the regression test from #13882
that showed it up.
- - - - -
3d6aba77 by konsumlamm at 2026-01-06T09:33:16-05:00
Fix changelog formatting
- - - - -
69e0ab59 by Cheng Shao at 2026-01-06T19:37:56-05:00
compiler: add targetHasRTSWays function
This commit adds a `targetHasRTSWays` util function in
`GHC.Driver.Session` to query if the target RTS has a given Ways (e.g.
WayThreaded).
- - - - -
25a0ab94 by Cheng Shao at 2026-01-06T19:37:56-05:00
compiler: link on-demand external interpreter with threaded RTS
This commit makes the compiler link the on-demand external interpreter
program with threaded RTS if it is available in the target RTS ways.
This is a better default than the previous single-threaded RTS, and it
enables the external interpreter to benefit from parallelism when
deserializing CreateBCOs messages.
- - - - -
92404a2b by Cheng Shao at 2026-01-06T19:37:56-05:00
hadrian: link iserv with threaded RTS
This commit makes hadrian link iserv with threaded RTS if it's
available in the RTS ways. Also cleans up the iserv main C program
which can be replaced by the `-fkeep-cafs` link-time option.
- - - - -
a20542d2 by Cheng Shao at 2026-01-06T19:38:38-05:00
ghc-internal: remove unused GMP macros
This patch removes unused GMP related macros from `ghc-internal`. The
in-tree GMP version was hard coded and outdated, but it was not used
anywhere anyway.
- - - - -
4079dcd6 by Cheng Shao at 2026-01-06T19:38:38-05:00
hadrian: fix in-tree gmp configure error on newer c compilers
Building in-tree gmp on newer c compilers that default to c23 fails at
configure stage, this patch fixes it, see added comment for
explanation.
- - - - -
414d1fe1 by Cheng Shao at 2026-01-06T19:39:20-05:00
compiler: fix LLVM backend pdep/pext handling for i386 target
This patch fixes LLVM backend's pdep/pext handling for i386 target,
and also removes non-existent 128/256/512 bit hs_pdep/hs_pext callees.
See amended note for more explanation. Fixes #26450.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
c7f6fba3 by Cheng Shao at 2026-01-06T19:39:20-05:00
ci: remove allow_failure flag for i386 alpine job
The LLVM codegen issue for i386 has been fixed, and the i386 alpine
job should pass now. This commit removes the allow_failure flag so
that other i386 regressions in the future are signaled more timely.
- - - - -
52d00c05 by Simon Peyton Jones at 2026-01-07T10:24:21-05:00
Add missing InVar->OutVar lookup in SetLevels
As #26681 showed, the SetLevels pass was failing to map an InVar to
an OutVar. Very silly! I'm amazed it hasn't broken before now.
I have improved the type singatures (to mention InVar and OutVar)
so it's more obvious what needs to happen.
- - - - -
ab0a5594 by Cheng Shao at 2026-01-07T10:25:04-05:00
hadrian: drop deprecated pkgHashSplitObjs code path
This patch drops deprecated `pkgHashSplitObjs` code path from hadrian,
since GHC itself has removed split objs support many versions ago and
this code path is unused.
- - - - -
bb3a2ba1 by Cheng Shao at 2026-01-07T10:25:44-05:00
hadrian: remove linting/assertion in quick-validate flavour
The `quick-validate` flavour is meant for testing ghc and passing the
testsuite locally with similar settings to `validate` but faster. This
patch removes the linting/assertion overhead in `quick-validate` to
improve developer experience. I also took the chance to simplify
redundant logic of rts/library way definition in `validate` flavour.
- - - - -
7971f5dd by Cheng Shao at 2026-01-07T10:26:26-05:00
deriveConstants: clean up unused constants
This patch cleans up unused constants from `deriveConstants`, they are
not used by C/Cmm code in the RTS, nor compiler-generated code.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
4df96993 by Cheng Shao at 2026-01-07T10:27:08-05:00
hadrian: pass -fno-omit-frame-pointer with +debug_info
This patch adds `-fno-omit-frame-pointer` as C/C++ compilation flag
when compiling with `+debug_info` flavour transformer. It's a sane
default when you care about debugging and reliable backtraces, and
makes debugging/profiling with bpf easier.
- - - - -
8a3900a3 by Aaron Allen at 2026-01-07T10:27:57-05:00
[26705] Include TyCl instances in data fam iface entry
Ensures dependent modules are recompiled when the class instances for a
data family instance change.
resolves #26705
- - - - -
a0b980af by Cheng Shao at 2026-01-07T10:28:38-05:00
hadrian: remove unused Hp2Ps/Hpc builders
This patch removes the Hp2Ps/Hpc builders from hadrian, they are
unused in the build system. Note that the hp2ps/hpc programs are still
built and not affected.
- - - - -
50a58757 by Cheng Shao at 2026-01-07T10:29:20-05:00
hadrian: only install js files to libdir for wasm/js targets
There are certain js files required for wasm/js targets to work, and
previously hadrian would install those js files to libdir
unconditionally on other targets as well. This could be a minor
annoyance for packagers especially when the unused js files contain
shebangs that interfere with the packaging process. This patch makes
hadrian only selectively install the right js files for the right
targets.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
da40e553 by Simon Peyton Jones at 2026-01-07T10:30:00-05:00
Add flavour transformer assertions_stage1
This allows us to enable -DDEBUG assertions in the stage1 compiler
- - - - -
ec3cf767 by Cheng Shao at 2026-01-08T06:24:31-05:00
make: remove unused Makefiles from legacy make build system
This patch removes unused Makefiles from legacy make build system; now
they are never used by hadrian in any way, and they already include
common boilerplate mk files that are long gone in the make build
system removal, hence the housecleaning.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
04ea3f83 by Cheng Shao at 2026-01-08T06:25:13-05:00
compiler: use -O3 as LLVM optimization level for ghc -O2
The GHC driver clamps LLVM optimization level to `-O2` due to LLVM
crashes, but those were historical issues many years ago that are no
longer relevant for LLVM versions we support today. This patch changes
the driver to use `-O3` as LLVM optimization level when compiling with
`-O2`, which is a better default when we're willing to trade
compilation time for faster generated code.
- - - - -
472df471 by Peter Trommler at 2026-01-08T13:28:54-05:00
Use half-word literals in info tables
With this commit info tables are mapped to the same assembler code
on big-endian and little-endian platforms.
Fixes #26579.
- - - - -
393f9c51 by Simon Peyton Jones at 2026-01-08T13:29:35-05:00
Refactor srutOkForBinderSwap
This MR does a small refactor:
* Moves `scrutOkForBinderSwap` and `BinderSwapDecision`
to GHC.Core.Utils
* Inverts the sense of the coercion it returns, which makes
more sense
No effect on behaviour
- - - - -
ad76fb0f by Simon Peyton Jones at 2026-01-08T13:29:36-05:00
Improve case merging
This small MR makes case merging happen a bit more often than
it otherwise could, by getting join points out of the way.
See #26709 and GHC.Core.Utils
Note [Floating join points out of DEFAULT alternatives]
- - - - -
4c9395f5 by Cheng Shao at 2026-01-08T13:30:16-05:00
hadrian: remove broken hsc2hs flag when cross compiling to windows
This patch removes the `--via-asm` hsc2hs flag when cross compiling to
windows. With recent llvm-mingw toolchain, it would fail with:
```
x86_64-w64-mingw32-hsc2hs: Cannot combine instructions: [Quad 8,Long 4,Long 241,Ref ".Ltmp1-.Ltmp0"]
```
The hsc2hs default `--cross-compile` logic is slower but works.
- - - - -
71fdef55 by Simon Peyton Jones at 2026-01-08T13:30:57-05:00
Try harder to keep the substitution empty
Avoid unnecessary cloning of variables in the Simplifier.
Addresses #26724,
See Note [Keeping the substitution empty]
We get some big wins in compile time
Metrics: compile_time/bytes allocated
-------------------------------------
Baseline
Test Metric value New value Change
----------------------------------------------------------------------------
CoOpt_Singletons(normal) ghc/alloc 721,544,088 692,174,216 -4.1% GOOD
LargeRecord(normal) ghc/alloc 1,268,031,157 1,265,168,448 -0.2%
T14766(normal) ghc/alloc 918,218,533 688,432,296 -25.0% GOOD
T15703(normal) ghc/alloc 318,103,629 306,638,016 -3.6% GOOD
T17836(normal) ghc/alloc 419,174,584 418,400,824 -0.2%
T18478(normal) ghc/alloc 471,042,976 470,261,376 -0.2%
T20261(normal) ghc/alloc 573,387,162 563,663,336 -1.7%
T24984(normal) ghc/alloc 87,832,666 87,636,168 -0.2%
T25196(optasm) ghc/alloc 1,103,284,040 1,101,376,992 -0.2%
hard_hole_fits(normal) ghc/alloc 224,981,413 224,608,208 -0.2%
geo. mean -0.3%
minimum -25.0%
maximum +0.1%
Metric Decrease:
CoOpt_Singletons
T14766
T15703
- - - - -
30341168 by Simon Peyton Jones at 2026-01-08T13:31:38-05:00
Add regression test for #24867
- - - - -
1ac1a541 by Julian Ospald at 2026-01-09T02:48:53-05:00
Support statically linking executables properly
Fixes #26434
In detail, this does a number of things:
* Makes GHC aware of 'extra-libraries-static' (this changes the package
database format).
* Adds a switch '-static-external' that will honour 'extra-libraries-static'
to link external system dependencies statically.
* Adds a new field to settings/targets: "ld supports verbatim namespace".
This field is used by '-static-external' to conditionally use '-l:foo.a'
syntax during linking, which is more robust than trying to find the
absolute path to an archive on our own.
* Adds a switch '-fully-static' that is meant as a high-level interface
for e.g. cabal. This also honours 'extra-libraries-static'.
This also attempts to clean up the confusion around library search directories.
At the moment, we have 3 types of directories in the package database
format:
* library-dirs
* library-dirs-static
* dynamic-library-dirs
However, we only have two types of linking: dynamic or static. Given the
existing logic in 'mungeDynLibFields', this patch assumes that
'library-dirs' is really just nothing but a fallback and always
prefers the more specific variants if they exist and are non-empty.
Conceptually, we should be ok with even just one search dirs variant.
Haskell libraries are named differently depending on whether they're
static or dynamic, so GHC can conveniently pick the right one depending
on the linking needs. That means we don't really need to play tricks
with search paths to convince the compiler to do linking as we want it.
For system C libraries, the convention has been anyway to place static and
dynamic libs next to each other, so we need to deal with that issue
anyway and it is outside of our control. But this is out of the scope
of this patch.
This patch is backwards compatible with cabal. Cabal should however
be patched to use the new '-fully-static' switch.
- - - - -
ad3c808d by Julian Ospald at 2026-01-09T02:48:53-05:00
Warn when "-dynamic" is mixed with "-staticlib"
- - - - -
322dd672 by Matthew Pickering at 2026-01-09T02:49:35-05:00
rts: Use INFO_TABLE_CONSTR for stg_dummy_ret_closure
Since the closure type is CONSTR_NOCAF, we need to use INFO_TABLE_CONSTR
to populate the constructor description field (this crashes ghc-debug
when decoding AP_STACK frames sometimes)
Fixes #26745
- - - - -
039bac4c by Ben Gamari at 2026-01-09T20:22:16-05:00
ghc-internal: Move STM utilities out of GHC.Internal.Conc.Sync
This is necessary to avoid an import cycle on Windows when importing
`GHC.Internal.Exception.Context` in `GHC.Internal.Conc.Sync`.
On the road to address #25365.
- - - - -
8c389e8c by Ben Gamari at 2026-01-09T20:22:16-05:00
base: Capture backtrace from throwSTM
Implements core-libraries-committee#297.
Fixes #25365.
- - - - -
e1ce1fc3 by Ben Gamari at 2026-01-09T20:22:16-05:00
base: Annotate rethrown exceptions in catchSTM with WhileHandling
Implements core-libraries-committee#298
- - - - -
c4ebdbdf by Cheng Shao at 2026-01-09T20:23:06-05:00
compiler: make getPrim eagerly evaluate its result
This commit makes `GHC.Utils.Binary.getPrim` eagerly evaluate its
result, to avoid accidental laziness when future patches build other
binary parsers using `getPrim`.
- - - - -
66a0c4f7 by Cheng Shao at 2026-01-09T20:23:06-05:00
compiler: implement fast get/put for Word16/Word32/Word64
Previously, `GHC.Utils.Binary` contains `get`/`put` functions for
`Word16`/`Word32`/`Word64` which always loads and stores them as
big-endian words at a potentially unaligned address. The previous
implementation is based on loads/stores of individual bytes and
concatenating bytes with bitwise operations, which currently cannot be
fused to a single load/store operation by GHC.
This patch implements fast `get`/`put` functions for
`Word16`/`Word32`/`Word64` based on a single memory load/store, with
an additional `byteSwap` operation on little-endian hosts. It is based
on unaligned load/store primops added since GHC 9.10, and we already
require booting with at least 9.10, so it's about time to switch to
this faster path.
- - - - -
641ec3f0 by Simon Peyton Jones at 2026-01-09T20:23:55-05:00
Fix scoping errors in specialisation
Using -fspecialise-aggressively in #26682 showed up a couple of
subtle errors in the type-class specialiser.
* dumpBindUDs failed to call `deleteCallsMentioning`, resulting in a
call that mentioned a dictionary that was not in scope. This call
has been missing since 2009!
commit c43c981705ec33da92a9ce91eb90f2ecf00be9fe
Author: Simon Peyton Jones <simonpj(a)microsoft.com>
Date: Fri Oct 23 16:15:51 2009 +0000
Fixed by re-combining `dumpBindUDs` and `dumpUDs`.
* I think there was another bug involving the quantified type
variables in polymorphic specialisation. In any case I refactored
`specHeader` and `spec_call` so that the former looks for the
extra quantified type variables rather than the latter. This
is quite a worthwhile simplification: less code, easier to grok.
Test case in simplCore/should_compile/T26682,
brilliantly minimised by @sheaf.
- - - - -
2433e91d by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: change sectionProtection to take SectionType argument
This commit changes `sectionProtection` to only take `SectionType`
argument instead of whole `Section`, since it doesn't need the Cmm
section content anyway, and it can then be called in parts of NCG
where we only have a `SectionType` in scope.
- - - - -
e5926fbe by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: change isInitOrFiniSection to take SectionType argument
This commit changes `isInitOrFiniSection` to only take `SectionType`
argument instead of whole `Section`, since it doesn't need the Cmm
section content anyway, and it can then be called in parts of NCG
where we only have a `SectionType` in scope. Also marks it as
exported.
- - - - -
244d57d7 by Cheng Shao at 2026-01-09T20:24:43-05:00
compiler: fix split sections on windows
This patch fixes split sections on windows by emitting the right
COMDAT section header in NCG, see added comment for more explanation.
Fix #26696 #26494.
-------------------------
Metric Decrease:
LargeRecord
T9675
size_hello_artifact
size_hello_artifact_gzip
size_hello_unicode
size_hello_unicode_gzip
Metric Increase:
T13035
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
182f3d0f by Cheng Shao at 2026-01-09T20:25:28-05:00
iserv: add comment about -fkeep-cafs
- - - - -
49675b69 by Matthew Craven at 2026-01-09T20:26:14-05:00
Account for "stupid theta" in demand sig for DataCon wrappers
Fixes #26748.
- - - - -
f3c18890 by Samuel Thibault at 2026-01-10T15:48:22+01:00
hurd: Fix getExecutablePath build
3939a8bf93e27 ("GNU/Hurd: Add getExecutablePath support") added using
/proc/self/exe for GNU/Hurd but missed adding the required imports for
the corresponding code.
- - - - -
7f15bd15 by Samuel Thibault at 2026-01-12T07:16:25-05:00
Fix the OS string encoding for GNU/Hurd
Following https://github.com/haskell/cabal/pull/9434/files , and as seen
in the various gnu_HOST_OS usages in the source code, it is expected that
GNU/Hurd is advertised as "gnu", like the autotools do.
- - - - -
1db2f240 by Andrew Lelechenko at 2026-01-12T07:17:06-05:00
Add since annotation for Data.Bifoldable1
Fixes #26432
- - - - -
e038a383 by Sven Tennie at 2026-01-12T07:17:49-05:00
Ignore Windows CI tool directories in Git
Otherwise, we see thousands of changes in `git status` which is very
confusing to work with.
- - - - -
023c301c by sheaf at 2026-01-13T04:57:30-05:00
Don't re-use stack slots for growing registers
This commit avoids re-using a stack slot for a register that has grown
but already had a stack slot.
For example, suppose we have stack slot assigments
%v1 :: FF64 |-> StackSlot 0
%v2 :: FF64 |-> StackSlot 1
Later, we start using %v1 at a larger format (e.g. F64x2) and we need
to spill it again. Then we **must not** use StackSlot 0, as a spill
at format F64x2 would clobber the data in StackSlot 1.
This can cause some fragmentation of the `StackMap`, but that's probably
OK.
Fixes #26668
- - - - -
d0966e64 by fendor at 2026-01-13T04:58:11-05:00
Remove `traceId` from ghc-pkg executable
- - - - -
20d7efec by Simon Peyton Jones at 2026-01-13T12:41:22-05:00
Make SpecContr rules fire a bit later
See #26615 and Note [SpecConstr rule activation]
- - - - -
8bc4eb8c by Andrew Lelechenko at 2026-01-13T12:42:03-05:00
Upgrade mtl submodule to 2.3.2
Fixes #26656
- - - - -
c94aaacd by Cheng Shao at 2026-01-13T12:42:44-05:00
compiler: remove iserv and only use on-demand external interpreter
This patch removes `iserv` from the tree completely. Hadrian would no
longer build or distribute `iserv`, and the GHC driver would use the
on-demand external interpreter by default when invoked with
`-fexternal-interpreter`, without needing to specify `-pgmi ""`. This
has multiple benefits:
- It allows cleanup of a lot of legacy hacks in the hadrian codebase.
- It paves the way for running cross ghc's iserv via cross emulator
(#25523), fixing TH/ghci support for cross targets other than
wasm/js.
- - - - -
c1fe0097 by Peter Trommler at 2026-01-14T03:54:49-05:00
PPC NCG: Fix shift right MO code
The shift amount in shift right [arithmetic] MOs is machine word
width. Therefore remove unnecessary zero- or sign-extending of
shift amount.
It looks harmless to extend the shift amount argument because the
shift right instruction uses only the seven lowest bits (i. e. mod 128).
But now we have a conversion operation from a smaller type to word width
around a memory load at word width. The types are not matching up but
there is no check done in CodeGen. The necessary conversion from word
width down to the smaller width would be translated into a no-op on
PowerPC anyway. So all seems harmless if it was not for a small
optimisation in getRegister'.
In getRegister' a load instruction with the smaller width of the
conversion operation was generated. This loaded the most significant
bits of the word in memory on a big-endian platform. These bits were
zero and hence shift right was used with shift amount zero and not one
as required in test Sized.
Fixes #26519
- - - - -
2dafc65a by Cheng Shao at 2026-01-14T03:55:31-05:00
Tree-wide cleanup of cygwin logic
GHC has not supported cygwin for quite a few years already, and will
not resume support in the forseeable future. The only supported
windows toolchain is clang64/clangarm64 of the msys2 project. This
patch cleans up the unused cygwin logic in the tree.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
66b96e2a by Teo Camarasu at 2026-01-14T03:56:13-05:00
Set default eventlog-flush-interval to 5s
Resolves #26707
- - - - -
d0254579 by Andrew Lelechenko at 2026-01-14T03:56:53-05:00
Document when -maxN RTS option was added
- - - - -
f25e2b12 by Cheng Shao at 2026-01-14T11:10:39-05:00
testsuite: remove obsolete --ci option from the testsuite driver
This patch removes the obsolete `--ci` option from the testsuite
driver: neither the CI scripts nor hadrian ever invokes the testsuite
driver with `--ci`, and the perf notes are always fetched to the
`refs/notes/perf` local reference anyway.
- - - - -
7964763b by Julian Ospald at 2026-01-14T11:11:31-05:00
Fix fetch_cabal
* download cabal if the existing one is of an older version
* fix FreeBSD download url
* fix unpacking on FreeBSD
- - - - -
6b0129c1 by Julian Ospald at 2026-01-14T11:11:31-05:00
Bump toolchain in CI
- - - - -
0f53ccc6 by Julian Ospald at 2026-01-14T11:11:31-05:00
Use libffi-clib
Previously, we would build libffi via hadrian
and bundle it manually with the GHC bindist.
This now moves all that logic out of hadrian
and allows us to have a clean Haskell package
to build and link against and ship it without
extra logic.
This patch still retains the ability to link
against a system libffi.
The main reason of bundling libffi was that on
some platforms (e.g. FreeBSD and Mac), system libffi
is not visible to the C toolchain by default,
so users would require settings in e.g. cabal
to be able to compile anything.
This adds the submodule libffi-clib to the repository.
- - - - -
5e1cd595 by Peng Fan at 2026-01-14T11:12:26-05:00
NCG/LA64: add support for la664 micro architecture
Add '-mla664' flag to LA664, which has some new features:
atomic instructions, dbar hints, etc.
'LA464' is the default so that unrecognized instructions are not
generated.
- - - - -
c56567ec by Simon Peyton Jones at 2026-01-15T23:19:04+00:00
Add evals for strict data-con args in worker-functions
This fixes #26722, by adding an eval in a worker for
arguments of strict data constructors, even if the
function body uses them strictly.
See (WIS1) in Note [Which Ids should be strictified]
I took the opportunity to make substantial improvements in the
documentation for call-by-value functions. See especially
Note [CBV Function Ids: overview] in GHC.Types.Id.Info
Note [Which Ids should be CBV candidates?] ditto
Note [EPT enforcement] in GHC.Stg.EnforceEpt
among others.
- - - - -
9719ce5d by Simon Peyton Jones at 2026-01-15T23:19:04+00:00
Improve `interestingArg`
This function analyses a function's argument to see if it is
interesting enough to deserve an inlining discount. Improvements
for
* LitRubbish arguments
* exprIsExpandable arguments
See Note [Interesting arguments] which is substantially rewritten.
- - - - -
7b616b9f by Cheng Shao at 2026-01-16T06:45:00-05:00
compiler: fix regression when compiling foreign stubs in the rts unit
This patch fixes a regression when compiling foreign stubs in the rts
unit introduced in 05e25647f72bc102061af3f20478aa72bff6ff6e. A simple
revert would fix it, but it's better to implement a proper fix with
comment for better understanding of the underlying problem, see the
added comment for explanation.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
c343ef64 by Sylvain Henry at 2026-01-16T06:45:51-05:00
base: remove GHC.JS.Prim.Internal.Build (#23432)
See accepted CLC proposal https://github.com/haskell/core-libraries-committee/issues/329
- - - - -
29c0aceb by Simon Peyton Jones at 2026-01-16T17:18:11-05:00
Improve newtype unwrapping
Ticket #26746 describes several relatively-minor shortcomings of newtype
unwrapping. This MR addresses them, while also (arguably) simplifying
the code a bit.
See new Note [Solving newtype equalities: overview]
and Note [Decomposing newtype equalities]
and Note [Eager newtype decomposition]
and Note [Even more eager newtype decomposition]
For some reason, on Windows only, runtime allocations decrease for test
T5205 (from 52k to 48k). I have not idea why. No change at all on Linux.
I'm just going to accept the change. (I saw this same effect in another
MR so I think it's a fault in the baseline.)
Metric Decrease:
T5205
- - - - -
8b59e62c by Andreas Klebinger at 2026-01-16T17:18:52-05:00
testsuite: Widen acceptance window for T5205.
Fixes #26782
- - - - -
9e5e0234 by mangoiv at 2026-01-17T06:03:03-05:00
add a new issue template for getting verified
To reduce spam created by new users, we will in future not grant
any rights but reporting issues to new users. That is why we will
have to be able to verify them. The added issue template serves that
purpose.
- - - - -
b18b2c42 by Cheng Shao at 2026-01-17T06:03:44-05:00
llvm: fix split sections for llvm backend
This patch fixes split sections for llvm backend:
- Pass missing `--data-sections`/`--function-sections` flags to
llc/opt.
- Use `@llvm.compiler.used` instead of `@llvm.used` to avoid sections
being unnecessarily retained at link-time.
Fixes #26770.
-------------------------
Metric Decrease:
libdir
size_hello_artifact
size_hello_unicode
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
ebf66f67 by Cheng Shao at 2026-01-17T13:16:50-05:00
Update autoconf scripts
Scripts taken from autoconf a2287c3041a3f2a204eb942e09c015eab00dc7dd
- - - - -
598624b9 by Andreas Klebinger at 2026-01-17T13:17:32-05:00
CString.hs: Update incorrect comment.
Fixes #26322
- - - - -
eea2036b by Cheng Shao at 2026-01-18T10:00:49-05:00
libraries: bump haskeline submodule to 0.8.4.1
This patch bumps the haskeline submodule to 0.8.4.1 which includes an
important fix for an ANSI handling bug on Windows
(https://github.com/haskell/haskeline/pull/126)
- - - - -
87d8f6c2 by Cheng Shao at 2026-01-18T10:01:30-05:00
hadrian: replace default -H32m/-H64m with -O64M to improve mutator productivity
Most hadrian build flavours pass `-H32m`/`-H64m` to GHC as
conventional wisdom to improve mutator productivity and reduce GC
overhead. They were inherited from the legacy Make build system, and
there used to be make flags to instrument a build process with
`-Rghc-timing` option to collect GC stats of each GHC run from stderr.
It's time to revisit whether there are better defaults for
`-H32m`/`-H64m`, and this patch changes it to `-O64M` which indeed
improves mutator productivity based on real statistics. `-O64M` is
more aggressive than `-H64m`; it allows the old generation to grow to
at least 64M before triggering major GC and reduces major GC runs.
The stats of a clean build with `validate` flavour and `-H64m`:
```
h64m.log
matched RTS stat lines: 5499
sum MUT cpu : 2400.808 s
sum GC cpu : 1378.292 s
sum MUT elapsed : 2788.253 s
sum GC elapsed : 1389.233 s
GC/MUT cpu ratio : 0.574 (GC is 57.4% of MUT)
GC/MUT elapsed ratio : 0.498 (GC is 49.8% of MUT)
GC fraction of (MUT+GC) cpu : 36.5%
GC fraction of (MUT+GC) elapsed : 33.3%
per-line GC/MUT cpu ratio: median 0.691, p90 1.777
per-line GC/MUT elapsed ratio: median 0.519, p90 1.081
```
The stats of a clean build with `validate` flavour and `-O64M`:
```
o64m.log
matched RTS stat lines: 5499
sum MUT cpu : 2377.383 s
sum GC cpu : 1127.146 s
sum MUT elapsed : 2758.857 s
sum GC elapsed : 1135.587 s
GC/MUT cpu ratio : 0.474 (GC is 47.4% of MUT)
GC/MUT elapsed ratio : 0.412 (GC is 41.2% of MUT)
GC fraction of (MUT+GC) cpu : 32.2%
GC fraction of (MUT+GC) elapsed : 29.2%
per-line GC/MUT cpu ratio: median 0.489, p90 1.099
per-line GC/MUT elapsed ratio: median 0.367, p90 0.806
```
Mutator time is roughly in the same ballpark, but GC CPU time has
reduced by 18.22%, and mutator productivity has increased from 63.5%
to 67.8%.
- - - - -
8372e13d by Cheng Shao at 2026-01-18T10:02:12-05:00
rts: remove unused .def files from rts/win32
This patch removes unused .def files from `rts/win32`, given we don't
build .dll files for rts/ghc-internal/ghc-prim at all. Even when we
resurrect win32 dll support at some point in the future, these .def
files still contain incorrect symbols anyway and won't be of any use.
- - - - -
f6af485d by Cheng Shao at 2026-01-18T10:03:19-05:00
.gitmodules: use gitlab mirror for the libffi-clib submodule
This patch fixes .gitmodules to use the gitlab mirror for the
libffi-clib submodule, to make it coherent with other submodules that
allow ghc developers to experiment with wip branches in submodules for
ghc patches. Fixes #26783.
- - - - -
41432d25 by Cheng Shao at 2026-01-18T10:05:13-05:00
hadrian: remove the horrible i386 speedHack
When hadrian builds certain rts objects for i386, there's a horrible
speedHack that forces -fno-PIC even for dynamic ways of those objects.
This is not compatible with newer versions of gcc/binutils as well as
clang/lld, and this patch removes it. Fixes #26792.
- - - - -
323eb8f0 by Cheng Shao at 2026-01-18T21:48:19-05:00
hadrian: enable split sections for cross stage0
This patch fixes a minor issue with `splitSectionsArgs` in hadrian:
previously, it's unconditionally disabled for stage0 libraries because
it's not going to be shipped in the final bindists. But it's only true
when not cross compiling. So for now we also need to enable it for
cross stage0 as well.
- - - - -
3fadfefe by Andreas Klebinger at 2026-01-18T21:49:01-05:00
RTS: Document -K behaviour better
- - - - -
30f442a9 by Teo Camarasu at 2026-01-20T13:57:26-05:00
base: don't expose GHC.Num.{BigNat, Integer, Natural}
We no longer expose GHC.Num.{BigNat, Integer, Natural} from base instead users should get these modules from ghc-bignum.
We make this change to insulate end users from changes to GHC's implementation of big numbers.
Implements CLC proposal 359: https://github.com/haskell/core-libraries-committee/issues/359
- - - - -
75a9053d by Teo Camarasu at 2026-01-20T13:58:07-05:00
base: deprecate GHC internals in GHC.Num
Implements CLC proposal: https://github.com/haskell/core-libraries-committee/issues/360
- - - - -
9534b032 by Andreas Klebinger at 2026-01-20T13:58:50-05:00
ghc-experimental: Update Changelog
I tried to reconstruct a high level overview of the changes and when
they were made since we introduced it.
Fixes #26506
Co-authored-by: Teo Camarasu <teofilcamarasu(a)gmail.com>
- - - - -
346f2f5a by Cheng Shao at 2026-01-20T13:59:30-05:00
hadrian: remove RTS options in ghc-in-ghci flavour
This patch removes the RTS options passed to ghc in ghc-in-ghci
flavour, to workaround command line argument handling issue in
hls/hie-boot that results in `-O64M` instead of `+RTS -O64M -RTS`
being passed to ghc. It's not a hadrian bug per se, since ghc's own
ghc-in-ghci multi repl works fine, but we should still make sure HLS
works. Closes #26801.
- - - - -
759fd15a by Andreas Klebinger at 2026-01-21T16:05:28-05:00
Don't build GHC with -Wcompat
Without bumping the boot compiler the warnings it produces are often not
actionable leading to pointless noise.
Fixes #26800
- - - - -
3172db94 by Torsten Schmits at 2026-01-21T16:06:11-05:00
Use the correct field of ModOrigin when formatting error message listing hidden reexports
- - - - -
485c12b2 by Cheng Shao at 2026-01-21T16:06:54-05:00
Revert "hadrian: handle findExecutable "" gracefully"
This reverts commit 1e5752f64a522c4025365856d92f78073a7b3bba. The
underlying issue has been fixed in
https://github.com/haskell/directory/commit/75828696e7145adc09179111a0d631b…
and present since 1.3.9.0, and hadrian directory lower bound is
1.3.9.0, so we can revert our own in house hack now.
- - - - -
5efb58dc by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: fix typo in TICK_ALLOC_RTS
This patch fixes a typo in the `TICK_ALLOC_RTS` macro, the original
`bytes` argument was silently dropped. The Cmm code has its own
version of `TICK_ALLOC_RTS` not affected by this typo, it affected the
C RTS, and went unnoticed because the variable `n` happened to also be
available at its call site. But the number was incorrect. Also fixes
its call site since `WDS()` is not available in C.
- - - - -
c406ea69 by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: remove broken & unused ALLOC_P_TICKY
This patch removes the `ALLOC_P_TICKY` macro from the rts, it's
unused, and its expanded code is already broken.
- - - - -
34a27e20 by Simon Peyton Jones at 2026-01-21T16:08:17-05:00
Make the implicit-parameter class have representational role
This MR addresses #26737, by making the built-in class IP
have a representational role for its second parameter.
See Note [IP: implicit parameter class] in
ghc-internal:GHC.Internal.Classes.IP
In fact, IP is (unfortunately, currently) exposed by
base:GHC.Base, so we ran a quick CLC proposal to
agree the change:
https://github.com/haskell/core-libraries-committee/issues/385
Some (small) compilations get faster because they only need to
load (small) interface file GHC.Internal.Classes.IP.hi,
rather than (large) GHC.Internal.Classes.hi.
Metric Decrease:
T10421
T12150
T12425
T24582
T5837
T5030
- - - - -
ca79475f by Cheng Shao at 2026-01-21T16:09:00-05:00
testsuite: avoid re.sub in favor of simple string replacements
This patch refactors the testsuite driver and avoids the usage of
re.sub in favor of simple string replacements when possible. The
changes are not comprehensive, and there are still a lot of re.sub
usages lingering around the tree, but this already addresses a major
performance bottleneck in the testsuite driver that might has to do
with quadratic or worse slowdown in cpython's regular expression
engine when handling certain regex patterns with large strings.
Especially on i386, and i386 jobs are the bottlenecks of all full-ci
validate pipelines!
Here are the elapsed times of testing x86_64/i386 with -j48 before
this patch:
x86_64: `Build completed in 6m06s`
i386: `Build completed in 1h36m`
And with this patch:
x86_64: `Build completed in 4m55s`
i386: `Build completed in 4m23s`
Fixes #26786.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
88c93796 by Zubin Duggal at 2026-01-21T16:09:42-05:00
ghc-toolchain: Also configure windres on non-windows platforms.
It may be needed for cross compilation.
Fixes #24588
- - - - -
9788c0ec by Cheng Shao at 2026-01-21T16:10:24-05:00
ghci: print external interpreter trace messages to stderr instead of stdout
This patch makes ghci print external interpreter trace messages to
stderr instead of stdout, which is a much saner choice for diagnostic
information. Closes #26807.
- - - - -
0491f08a by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: don't use CAS without PARALLEL_GC on
If we're not using the parallel GC, there is no reason to do a costly
CAS. This was flagged as taking time in a perf profile.
- - - - -
211a8f56 by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: suffix parallel GC with "par" instead of "thr"
Avoid some potential confusion (see discussion in !15351).
- - - - -
77a23cbd by fendor at 2026-01-22T03:45:08-05:00
Remove blanket ignore that covers libraries/
- - - - -
18bf7f5c by Léana Jiang at 2026-01-22T08:58:45-05:00
doc: update Flavour type in hadrian user-settings
- - - - -
3d5a1365 by Cheng Shao at 2026-01-22T08:59:28-05:00
hadrian: add missing notCross predicate for stage0 -O0
There are a few hard-coded hadrian args that pass -O0 when compiling
some heavy modules in stage0, which only makes sense when not
cross-compiling and when cross-compiling we need properly optimized
stage0 packages. So this patch adds the missing `notCross` predicate
in those places.
- - - - -
ee937134 by Matthew Pickering at 2026-01-22T09:00:10-05:00
Fix ghc-experimental GHC.Exception.Backtrace.Experimental module
This module wasn't added to the cabal file so it was never compiled or
included in the library.
- - - - -
1b490f5a by Zubin Duggal at 2026-01-22T09:00:53-05:00
hadrian: Add ghc-{experimental,internal}.cabal to the list of dependencies of the doc target
We need these files to detect the version of these libraries
Fixes #26738
- - - - -
cdb74049 by Cheng Shao at 2026-01-22T14:52:36-05:00
rts: avoid Cmm loop to initialize Array#/SmallArray#
Previously, `newArray#`/`newSmallArray#` called an RTS C function to
allocate the `Array#`/`SmallArray#`, then used a Cmm loop to
initialize the elements. Cmm doesn't have native for-loop so the code
is a bit awkward, and it's less efficient than a C loop, since the C
compiler can effectively vectorize the loop with optimizations.
So this patch moves the loop that initializes the elements to the C
side. `allocateMutArrPtrs`/`allocateSmallMutArrPtrs` now takes a new
`init` argument and initializes the elements if `init` is non-NULL.
- - - - -
4c784f00 by Cheng Shao at 2026-01-22T14:53:19-05:00
Fix testsuite run for +ipe flavour transformer
This patch makes the +ipe flavour transformer pass the entire
testsuite:
- An RTS debug option `-DI` is added, the IPE trace information is now
only printed with `-DI`. The test cases that do require IPE trace
are now run with `-DI`.
- The testsuite config option `ghc_with_ipe` is added, enabled when
running the testsuite with `+ipe`, which skips a few tests that are
sensitive to eventlog output, allocation patterns etc that can fail
under `+ipe`.
This is the first step towards #26799.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
be8e5236 by Ben Gamari at 2026-01-23T03:28:45-05:00
hadrian: Bump QuickCheck upper bound
This patch bumps QuickCheck upper bound to 2.18. selftest rule
manually tested to work with current latest QuickCheck-2.17.1.0.
- - - - -
5aa328fb by Zubin Duggal at 2026-01-23T03:29:30-05:00
Add genindex to index.rst. This adds a link to the index in the navigation bar.
Fixes #26437
- - - - -
917ab8ff by Oleg Grenrus at 2026-01-23T10:52:55-05:00
Export labelThread from Control.Concurrent
- - - - -
3f5e8d80 by Cheng Shao at 2026-01-23T10:53:37-05:00
ci: only push perf notes on master/release branches
This patch fixes push_perf_notes logic in ci.sh to only push perf
notes on master/release branches. We used to unconditionally push perf
notes even in MRs, but the perf numbers in the wip branches wouldn't
be used as baseline anyway, plus this is causing a space leak in the
ghc-performance-notes repo. See #25317 for the perf notes repo size
problem.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
414b9593 by Cheng Shao at 2026-01-24T07:11:51-05:00
ci: remove duplicate keys in .gitlab-ci.yml
This patch removes accidentally duplicate keys in `.gitlab-ci.yml`.
The YAML spec doesn't allow duplicate keys in the first place, and
according to GitLab docs
(https://docs.gitlab.com/ci/yaml/yaml_optimization/#anchors) the
latest key overrides the earlier entries.
- - - - -
e5cb5491 by Cheng Shao at 2026-01-24T07:12:34-05:00
hadrian: drop obsolete configure/make builder logic for libffi
This patch drops obsolete hadrian logic around `Configure
libffiPath`/`Make libffiPath` builders, they are no longer needed
after libffi-clib has landed. Closes #26815.
- - - - -
2d160222 by Simon Hengel at 2026-01-24T07:13:17-05:00
Fix typo in roles.rst
- - - - -
56db94f7 by Peter Trommler at 2026-01-26T11:26:18+01:00
PPC NCG: Generate clear right insn at arch width
The clear right immediate (clrrxi) is only available in word and
doubleword width. Generate clrrxi instructions at architecture
width for all MachOp widths.
Fixes #24145
- - - - -
5957a8ad by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00
Add operations for obtaining operating-system handles
This contribution implements CLC proposal #369. It adds operations for
obtaining POSIX file descriptors and Windows handles that underlie
Haskell handles. Those operating system handles can also be obtained
without such additional operations, but this is more involved and, more
importantly, requires using internals.
- - - - -
86a0510c by Greg Steuck at 2026-01-27T06:12:34-05:00
Move flags to precede patterns for grep and read files directly
This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools.
There's no reason to use cat and pipe where direct file argument works.
- - - - -
50761451 by Cheng Shao at 2026-01-27T21:51:23-05:00
ci: update darwin boot ghc to 9.10.3
This patch updates darwin boot ghc to 9.10.3, along with other related
updates, and pays off some technical debt here:
- Update `nixpkgs` and use the `nixpkgs-25.05-darwin` channel.
- Update the `niv` template.
- Update LLVM to 21 and update `llvm-targets` to reflect LLVM 21
layout changes for arm64/x86_64 darwin targets.
- Use `stdenvNoCC` to prevent nix packaged apple sdk from being used
by boot ghc, and manually set `DEVELOPER_DIR`/`SDKROOT` to enforce
the usage of system-wide command line sdk for macos.
- When building nix derivation for boot ghc, run `configure` via the
`arch` command so that `configure` and its subprocesses pick up the
manually specified architecture.
- Remove the previous horrible hack that obliterates `configure` to
make autoconf test result in true. `configure` now properly does its
job.
- Remove the now obsolete configure args and post install settings
file patching logic.
- Use `scheme-small` for texlive to avoid build failures in certain
unused texlive packages, especially on x86_64-darwin.
- - - - -
94dcd15e by Matthew Pickering at 2026-01-27T21:52:05-05:00
Evaluate backtraces for "error" exceptions at the moment they are thrown
See Note [Capturing the backtrace in throw] and
Note [Hiding precise exception signature in throw] which explain the
implementation.
This commit makes `error` and `throw` behave the same with regard to
backtraces. Previously, exceptions raised by `error` would not contain
useful IPE backtraces.
I did try and implement `error` in terms of `throw` but it started to
involve putting diverging functions into hs-boot files, which seemed to
risky if the compiler wouldn't be able to see if applying a function
would diverge.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/383
Fixes #26751
- - - - -
ef35e3ea by Teo Camarasu at 2026-01-27T21:52:46-05:00
ghc-internal: move all Data instances to Data.Data
Most instances of Data are defined in GHC.Internal.Data.Data.
Let's move all remaining instance there.
This moves other modules down in the dependency hierarchy allowing for
more parallelism, and it decreases the likelihood that we would need to
load this heavy .hi file if we don't actually need it.
Resolves #26830
Metric Decrease:
T12227
T16875
- - - - -
5e0ec555 by sheaf at 2026-01-28T06:56:38-05:00
Add test case for #25679
This commit adds the T25679 test case. The test now passes, thanks to
commit 1e53277af36d3f0b6ad5491f70ffc5593a49dcfd.
Fixes #25679
- - - - -
f1cd1611 by sheaf at 2026-01-28T06:56:38-05:00
Improve defaulting of representational equalities
This commit makes the defaulting of representational equalities, introduced
in 1e53277a, a little bit more robust. Now, instead of calling the eager
unifier, it calls the full-blown constraint solver, which means that it can
handle some subtle situations, e.g. involving functional dependencies and
type-family injectivity annotations, such as:
type family F a = r | r -> a
type instance F Int = Bool
[W] F beta ~R Bool
- - - - -
25edf516 by sheaf at 2026-01-28T06:56:38-05:00
Improve errors for unsolved representational equalities
This commit adds a new field of CtLoc, CtExplanations, which allows the
typechecker to leave some information about what it has done. For the moment,
it is only used to improve error messages for unsolved representational
equalities. The typechecker will now accumulate, when unifying at
representational role:
- out-of-scope newtype constructors,
- type constructors that have nominal role in a certain argument,
- over-saturated type constructors,
- AppTys, e.g. `c a ~R# c b`, to report that we must assume that 'c' has
nominal role in its parameters,
- data family applications that do not reduce, potentially preventing
newtype unwrapping.
Now, instead of having to re-construct the possible errors after the fact,
we simply consult the CtExplanations field.
Additionally, this commit modifies the typechecker error messages that
concern out-of-scope newtype constructors. The error message now depends
on whether we have an import suggestion to provide to the user:
- If we have an import suggestion for the newtype constructor,
the message will be of the form:
The data constructor MkN of the newtype N is out of scope
Suggested fix: add 'MkN' to the import list in the import of 'M'
- If we don't have any import suggestions, the message will be
of the form:
NB: The type 'N' is an opaque newtype, whose constructor is hidden
Fixes #15850, #20289, #20468, #23731, #25949, #26137
- - - - -
4d0e6da1 by Simon Peyton Jones at 2026-01-28T06:57:19-05:00
Fix two bugs in short-cut constraint solving
There are two main changes here:
* Use `isSolvedWC` rather than `isEmptyWC` in `tryShortCutSolver`
The residual constraint may have some fully-solved, but
still-there implications, and we don't want them to abort short
cut solving! That bug caused #26805.
* In the short-cut solver, we abandon the fully-solved residual
constraint; but we may thereby lose track of Givens that are
needed, and either report them as redundant or prune evidence
bindings that are in fact needed.
This bug stopped the `constraints` package from compiling;
see the trail in !15389.
The second bug led me to (another) significant refactoring
of the mechanism for tracking needed EvIds. See the new
Note [Tracking needed EvIds] in GHC.Tc.Solver.Solve
It's simpler and much less head-scratchy now.
Some particulars:
* An EvBindsVar now tracks NeededEvIds
* We deal with NeededEvIds for an implication only when it is
fully solved. Much simpler!
* `tryShortCutTcS` now takes a `TcM WantedConstraints` rather than
`TcM Bool`, so that is can plumb the needed EvIds correctly.
* Remove `ic_need` and `ic_need_implic` from Implication (hooray),
and add `ics_dm` and `ics_non_dm` to `IC_Solved`.
Pure refactor
* Shorten data constructor `CoercionHole` to `CH`, following
general practice in GHC.
* Rename `EvBindMap` to `EvBindsMap` for consistency
- - - - -
662480b7 by Cheng Shao at 2026-01-28T06:58:00-05:00
ci: use debian validate bindists instead of fedora release bindists in testing stage
This patch changes the `abi-test`, `hadrian-multi` and `perf` jobs in
the full-ci pipeline testing stage to use debian validate bindists
instead of fedora release bindists, to increase pipeline level
parallelism and allow full-ci pipelines to complete earlier. Closes #26818.
- - - - -
39581ec6 by Cheng Shao at 2026-01-28T06:58:40-05:00
ci: run perf test with -j$cores
This patch makes the perf ci job compile Cabal with -j$cores to speed
up the job.
- - - - -
607b287b by Wolfgang Jeltsch at 2026-01-28T15:41:53+02:00
Remove `GHC.Desugar` from `base`
`GHC.Desugar` was deprecated and should have been removed in GHC 9.14.
However, the removal was forgotten, although there was a code block that
was intended to trigger a compilation error when the GHC version in use
was 9.14 or later. This code sadly didn’t work, because the
`__GLASGOW_HASKELL__` macro was misspelled as `__GLASGOW_HASKELL`.
- - - - -
e8f5a45d by sterni at 2026-01-29T04:19:18-05:00
users_guide: fix runtime error during build with Sphinx 9.1.0
Appears that pathto is stricter about what it accepts now.
Tested Sphinx 8.2.3 and 9.1.0 on the ghc-9.10 branch.
Resolves #26810.
Co-authored-by: Martin Weinelt <hexa(a)darmstadt.ccc.de>
- - - - -
ce2d62fb by Jessica Clarke at 2026-01-29T19:48:51-05:00
PPC NCG: Use libcall for 64-bit cmpxchg on 32-bit PowerPC
There is no native instruction for this, and even if there were a
register pair version we could use, the implementation here is assuming
the values fit in a single register, and we end up only using / defining
the low halves of the registers.
Fixes: b4d39adbb5 ("PrimOps: Add CAS op for all int sizes")
Fixes: #23969
- - - - -
43d97761 by Michael Karcher at 2026-01-29T19:49:43-05:00
NCG for PPC: add pattern for CmmRegOff to iselExpr64
Closes #26828
- - - - -
aeeb4a20 by Matthew Pickering at 2026-01-30T11:42:47-05:00
determinism: Use deterministic map for Strings in TyLitMap
When generating typeable evidence the types we need evidence for all
cached in a TypeMap, the order terms are retrieved from a type map
determines the order the bindings appear in the program.
A TypeMap is quite diligent to use deterministic maps, apart from in the
TyLitMap, which uses a UniqFM for storing strings, whose ordering
depends on the Unique of the FastString.
This can cause non-deterministic .hi and .o files.
An unexpected side-effect is the error message but RecordDotSyntaxFail8
changing. I looked into this with Sam and this change caused the
constraints to be solved in a different order which results in a
slightly different error message. I have accepted the new test, since
the output before was non-deterministic and the new output is consistent
with the other messages in that file.
Fixes #26846
- - - - -
9e4d70c2 by Andrew Lelechenko at 2026-01-30T11:43:29-05:00
Upgrade text submodule to 2.1.4
- - - - -
631fa5ae by Recursion Ninja at 2026-01-31T22:30:11+00:00
Decouple `L.S.H.Decls` from importing `GHC.Types.Basic`
Data-types within `GHC.Types.Basic` which describe components of
the AST are migrated to `Language.Haskell.Syntax.Basic`. Related
function definitions are also moved.
Types moved to L.H.S. because they are part of the AST:
* TopLevelFlag
* RuleName
Types moved from L.H.S. to GHC.Hs. because they are not needed in the AST:
* TyConFlavour
* TypeOrData
* NewOrData
Migrated instances:
* `Outputable` instances moved to in `GHC.Utils.Outputable`
* `Binary` instance of `Boxity` moved to to `GHC.Utils.Binary`
* Other `Binary` instances are orphans to be migrated later.
The `OverlapMode` data-type is given a TTG extension point.
The `OverlapFlag` data-type, which depends on `OverlapMode`,
is updated to support `OverlapMode` with a GHC "pass" type paramerter.
In order to avoid module import cycles, `OverlapMode` and `OverlapFlag`
are migrated to new modules (no way around this).
* Migrated `OverlapMode` to new module `Language.Haskell.Syntax.Overlap`
* Migrated `OverlapFlag` to new module `GHC.Hs.Decls.Overlap`
- - - - -
9769cc03 by Simon Hengel at 2026-02-01T04:21:03-05:00
Update the documentation for MultiWayIf (fixes #25376)
(so that it matches the implementation)
- - - - -
5fc9442a by Peter Trommler at 2026-02-01T04:21:44-05:00
hadrian: Fix dependency generation for assembler
Assembler files allow # for comments unless in column 1. A modern
cpp for C treats those a preprocessor directives. We tell gcc that
a .S file is assembler with cpp and not C.
Fixes #26819
- - - - -
269c4087 by Simon Peyton Jones at 2026-02-01T19:38:10-05:00
Include current phase in the range for rule/unfoldings
This MR fixes a bad loop in the compiler: #26826.
The fix is to add (WAR2) to
Note [What is active in the RHS of a RULE or unfolding?]
in GHC.Core.Opt.Simplify.Utils
- - - - -
ddf1434f by Vladislav Zavialov at 2026-02-01T19:38:52-05:00
Refactor: merge HsMultilineString into HsString (#26860)
Before this patch, HsLit defined two separate constructors to represent
single-line and multi-line strings:
data HsLit x
...
| HsString (XHsString x) FastString
| HsMultilineString (XHsMultilineString x) FastString
I found this to be an unnecessary complication and an obstacle to unifying
HsLit with HsTyLit. Now we use HsString for both kinds of literals.
One user-facing change here is `ppr (HsString st s)` behaving differently for
single-line strings containing newlines:
x = "first line \
\asdf\n\
\second line"
Previously, the literal was fed to `ftext` with its newlines, producing an
ill-formed SDoc. This issue is now addressed by using `split` for both
single-line and multi-line strings:
vcat $ map text $ split '\n' (unpackFS src)
See the parser/should_fail/T26860ppr test.
In addition (and unrelatedly to the main payload of this patch),
drop the unused pmPprHsLit helper.
- - - - -
2b4f463c by Simon Peyton Jones at 2026-02-02T17:32:32+00:00
Remove exprIsCheap from doFloatFromRhs
See #26854 and Note [Float when expandable]
This patch simplifies the code, by removing an extra unnecessary test.
- - - - -
9db7f21f by Brandon Chinn at 2026-02-03T09:15:10-05:00
Refactor: make function patterns exhaustive
Also added missing (==) logic for:
* HsMultilineString
* HsInt{8,16,32}
* HsWord{8,16,32}
- - - - -
aa9c5e2c by Hécate Kleidukos at 2026-02-03T15:58:35-05:00
driver: Hide source paths at verbosity level 1 by default
- - - - -
c64cca1e by mangoiv at 2026-02-03T15:59:29-05:00
ExplicitLevelImports: check staging for types just like for values
Previously, imported types were entirely exempted from staging checks as
the implicit stage persistance assumed to be all imported types to be
well staged. ExplicitLevelImports' change specification, however, does
not do such an exemption. Thus we want to introduce such a check, just
like we have for values.
ExplicitLevelImports does not, however, talk about local names - from
its perspective, we could theoretically keep treating locally introduced
types specially - e.g. an ill-staged used in a quote would only emit a
warning, not an error. To allow for a potential future migration away
from such wrinkles as the staging check in notFound
(see Note [Out of scope might be a staging error]) we consistently do
the strict staging check that we also do for value if ExplicitLevelImports
is on.
Closes #26098
- - - - -
5f0dbeb6 by Simon Hengel at 2026-02-03T16:00:12-05:00
Use Haddock formatting in deprecation message of `initNameCache`
- - - - -
01ecb612 by Andreas Klebinger at 2026-02-04T09:56:25-05:00
testsuite: Explicitly use utf-8 encoding in rts-includes linter.
Not doing so caused failures on windows, as python failed to pick a
reasonable encoding even with locale set.
Fixes #26850
- - - - -
ea0d1317 by Zubin Duggal at 2026-02-04T09:57:06-05:00
Bump transformers submodule to 0.6.3.0
Fixes #26790
- - - - -
cbe4300e by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix subtle bug in GHC.Core.Utils.mkTick
This patch fixes a decade-old bug in `mkTick`, which
could generate type-incorrect code! See the diagnosis
in #26772.
The new code is simpler and easier to understand.
(As #26772 says, I think it could be improved further.)
- - - - -
a193a8da by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Modify a debug-trace in the Simplifier
...just to show a bit more information.
- - - - -
b579dfdc by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix long-standing interaction between ticks and casts
The code for Note [Eliminate Identity Cases] was simply wrong when
ticks and casts interacted. This patch fixes the interaction.
It was shown up when validating #26772, although it's not the exactly
the bug that's reported by #26772. Nor is it easy to reproduce, hence
no regression test.
- - - - -
fac0de1e by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump Cabal submodule to 3.16.1.0
- - - - -
00589122 by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump deepseq submodule to 1.5.2.0
Also:
- Get rid of usage of deprecated `NFData` function instance in the
compiler
- `T21391` still relies on `NFData` function instance, add
`-Wno-deprecations` for the time being.
- - - - -
84474c71 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump directory submodule to 1.3.10.1
- - - - -
1a9f4662 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump exceptions submodule to 0.10.12
- - - - -
2e39a340 by Peng Fan at 2026-02-07T03:42:01-05:00
NCG/LA64: adjust register usage to avoid src-register being clobbered
- - - - -
9faf1b35 by Teo Camarasu at 2026-02-07T03:42:43-05:00
ghc-internal: Delete unnecessary GHC.Internal.Data.Ix
This module merely re-exports GHC.Internal.Ix. It was copied from
`base` when `ghc-internal` was split, but there is no reason to have
this now. So, let's delete it.
Resolves #26848
- - - - -
d112b440 by Sven Tennie at 2026-02-07T10:47:56-05:00
Add cabal.project file to generate-ci
This fixes the HLS setup for our CI code generation script
(generate-ci).
The project file simply makes `generate-ci` of the cabal file
discoverable.
- - - - -
5339f6f0 by Andreas Klebinger at 2026-02-07T10:48:40-05:00
CI: Don't collapse test results.
This puts test output back into the primary test log instead of a
subsection removing the need to expand a section to see test results.
While the intention was good in practice the old behaviour mostly wastes time
by requiring expansion of the section.
Fixes #26882
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0e1cd2e0 by Evan Piro at 2026-02-08T10:35:16-08:00
Linker.MacOS reduce dynflags import
- - - - -
1c79a4cd by Michael Alan Dorman at 2026-02-09T08:11:51-05:00
Remove `extra_src_files` variable from `testsuite/driver/testlib.py`
While reading through the test harness code, I noticed this variable
with a TODO attached that referenced #12223. Although that bug is
closed, it strongly implied that this special-case variable that only
affected a single test was expected to be removed at some point.
I also looked at 3415bcaa0b1903b5e12dfaadb5b774718e406eab---where it
was added---whose commit message suggested that it would have been
desirable to remove it, but that there were special circumstances that
meant it had to remain (though it doesn't elucidate what those special
circumstances are).
However, the special circumstances were mentioned as if the test was
in a different location than is currently is, so I decided to try
changing the test to use the standard `extra_files` mechanism, which
works in local testing.
This also seems like a reasonable time to remove the script that was
originally used in the transition, since it doesn't really serve a
purpose anymore.
- - - - -
0020e38a by Matthew Pickering at 2026-02-09T17:29:14-05:00
determinism: Use a stable sort in WithHsDocIdentifiers binary instance
`WithHsDocIdentifiers` is defined as
```
71 data WithHsDocIdentifiers a pass = WithHsDocIdentifiers
72 { hsDocString :: !a
73 , hsDocIdentifiers :: ![Located (IdP pass)]
74 }
```
This list of names is populated from `rnHsDocIdentifiers`, which calls
`lookupGRE`, which calls `lookupOccEnv_AllNameSpaces`, which calls
`nonDetEltsUFM` and returns the results in an order depending on
uniques.
Sorting the list with a stable sort before returning the interface makes
the output deterministic and follows the approach taken by other fields
in `Docs`.
Fixes #26858
- - - - -
89898ce6 by echoumcp1 at 2026-02-09T17:30:01-05:00
Replace putstrln with logMsg in handleSeqHValueStatus
Fixes #26549
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7c52c4f9 by John Paul Adrian Glaubitz at 2026-02-10T13:52:43-05:00
rts: Switch prim to use modern atomic compiler builtins
The __sync_*() atomic compiler builtins have been deprecated in GCC
for a while now and also don't provide variants for 64-bit values
such as __sync_fetch_and_add_8().
Thus, replace them with the modern __atomic_*() compiler builtins and
while we're at it, also drop the helper macro CAS_NAND() which is now
no longer needed since we stopped using the __sync_*() compiler builtins
altogether.
Co-authored-by: Ilias Tsitsimpis <iliastsi(a)debian.org>
Fixes #26729
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cf60850a by Recursion Ninja at 2026-02-10T13:53:27-05:00
Decoupling L.H.S.Decls from GHC.Types.ForeignCall
- Adding TTG extension point for 'CCallTarget'
- Adding TTG extension point for 'CType'
- Adding TTG extension point for 'Header'
- Moving ForeignCall types that do not need extension
to new L.H.S.Decls.Foreign module
- Replacing 'Bool' parameters with descriptive data-types
to increase clairty and prevent "Boolean Blindness"
- - - - -
11a04cbb by Eric Lee at 2026-02-11T09:20:46-05:00
Derive Semigroup/Monoid for instances believed could be derived in #25871
- - - - -
15d9ce44 by Eric Lee at 2026-02-11T09:20:46-05:00
add Ghc.Data.Pair deriving
- - - - -
c85dc170 by Evan Piro at 2026-02-11T09:21:45-05:00
Linker.MacOS reduce options import
- - - - -
a541dd83 by Chris Wendt at 2026-02-11T16:06:41-05:00
Initialize plugins for `:set +c` in GHCi
Fixes #23110.
- - - - -
0f5a73bc by Cheng Shao at 2026-02-11T16:07:27-05:00
compiler: add Binary Text instance
This patch adds `Binary` instance for strict `Text`, in preparation of
making `Text` usable in certain GHC API use cases (e.g. haddock). This
also introduces `text` as a direct dependency of the `ghc` package.
- - - - -
9e58b8a1 by Cheng Shao at 2026-02-11T16:08:10-05:00
ghc-toolchain: add C11 check
This patch partially reverts commit
b8307eab80c5809df5405d76c822bf86877f5960 that removed C99 check in
autoconf/ghc-toolchain. Now we:
- No longer re-implement `FP_SET_CFLAGS_C11` similar to
`FP_SET_CFLAGS_C99` in the past, since autoconf doesn't provide a
convenient `AC_PROG_CC_C11` function. ghc-toolchain will handle it
anyway.
- The Cmm CPP C99 check is relanded and repurposed for C11.
- The C99 logic in ghc-toolchain is relanded and repurposed for C11.
- The C99 check in Stg.h is corrected to check for C11. The obsolete
_ISOC99_SOURCE trick is dropped.
- Usages of `-std=gnu99` in the testsuite are corrected to use
`-std=gnu11`.
Closes #26908.
- - - - -
4df0adf6 by Simon Peyton Jones at 2026-02-11T21:50:13-05:00
Simplify the treatment of static forms
This MR implements GHC proposal 732: simplify static forms,
https://github.com/ghc-proposals/ghc-proposals/pull/732
thereby addressing #26556.
See `Note [Grand plan for static forms]` in GHC.Iface.Tidy.StaticPtrTable
The main changes are:
* There is a new, simple rule for (static e), namely that the free
term variables of `e` must be bound at top level. The check is
done in the `HsStatic` case of `GHC.Rename.Expr.rnExpr`
* That in turn substantially simplifies the info that the typechecker
carries around in its type environment. Hooray.
* The desugarer emits static bindings to top level directly; see the
`HsStatic` case of `dsExpr`.
* There is no longer any special static-related magic in the FloatOut
pass. And the main Simplifier pipeline no longer needs a special case
to run FloatOut even with -O0. Hooray.
All this forced an unexpected change to the pattern match checker. It
recursively invokes the main Hs desugarer when it wants to take a look
at a term to spot some special cases (notably constructor applications).
We don't want to emit any nested (static e) bindings to top level a
second time! Yikes.
That forced a modest refactor in GHC.HsToCore.Pmc:
* The `dsl_nablas` field of `DsLclEnv` now has a `NoPmc` case, which says
"I'm desugaring just for pattern-match checking purposes".
* When that flag is set we don't emit static binds.
That in turn forces a cascade of refactoring, but the net effect is an
improvement; less risk of duplicated (even exponential?) work.
See Note [Desugaring HsExpr during pattern-match checking].
10% metric decrease, on some architectures, of compile-time max-bytes-used on T15304.
Metric Decrease:
T15304
- - - - -
7922f728 by Teo Camarasu at 2026-02-11T21:50:58-05:00
ghc-internal: avoid depending on GHC.Internal.Exts
This module is mostly just re-exports. It made sense as a user-facing
module, but there's no good reason ghc-internal modules should depend on
it and doing so linearises the module graph
- move considerAccessible to GHC.Internal.Magic
Previously it lived in GHC.Internal.Exts, but it really deserves to live
along with the other magic function, which are already re-exported from .Exts
- move maxTupleSize to GHC.Internal.Tuple
This previously lived in GHC.Internal.Exts but a comment already said it
should be moved to .Tuple
Resolves #26832
- - - - -
b6a4a29b by Eric Lee at 2026-02-11T21:51:55-05:00
Remove unused Semigroup imports to fix GHC 9.14 bootstrapping
- - - - -
99d8c146 by Simon Peyton Jones at 2026-02-12T17:36:59+00:00
Fix subtle bug in cast worker/wrapper
See (CWw4) in Note [Cast worker/wrapper].
The true payload is in the change to the definition of
GHC.Types.Id.Info.hasInlineUnfolding
Everthing else is just documentation.
There is a 2% compile time decrease for T13056;
I'll take the win!
Metric Decrease:
T13056
- - - - -
530e8e58 by Simon Peyton Jones at 2026-02-12T20:17:23-05:00
Add regression tests for four StaticPtr bugs
Tickets #26545, #24464, #24773, #16981 are all solved by the
recently-landed MR
commit 318ee13bcffa6aa8df42ba442ccd92aa0f7e210c
Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com>
Date: Mon Oct 20 23:07:20 2025 +0100
Simplify the treatment of static forms
This MR just adds regression tests for them.
- - - - -
4157160f by Cheng Shao at 2026-02-13T06:27:04-05:00
ci: remove unused hlint-ghc-and-base job definition
This patch removes the unused `hlint-ghc-and-base` job definition,
it's never run since !9806. Note that hadrian lint rules still work
locally, so anyone that wishes to run hlint on the codebase can
continue to do so in their local worktree.
- - - - -
039f1977 by Cheng Shao at 2026-02-13T06:27:47-05:00
wasm: use import.meta.main for proper distinction of nodejs main modules
This patch uses `import.meta.main` for proper distinction of nodejs
main modules, especially when the main module might be installed as a
symlink. Fixes #26916.
- - - - -
14f485ee by ARATA Mizuki at 2026-02-17T09:09:24+09:00
Support more x86 extensions: AVX-512 {BW,DQ,VL} and GFNI
Also, mark AVX-512 ER and PF as deprecated.
AVX-512 instructions can be used for certain 64-bit integer vector operations.
GFNI can be used to implement bitReverse (currently not used by NCG, but LLVM may use it).
Closes #26406
Addresses #26509
- - - - -
016f79d5 by fendor at 2026-02-17T09:16:16-05:00
Hide implementation details from base exception stack traces
Ensure we hide the implementation details of the exception throwing mechanisms:
* `undefined`
* `throwSTM`
* `throw`
* `throwIO`
* `error`
The `HasCallStackBacktrace` should always have a length of exactly 1,
not showing internal implementation details in the stack trace, as these
are vastly distracting to end users.
CLC proposal [#387](https://github.com/haskell/core-libraries-committee/issues/387)
- - - - -
4f2840f2 by Brian J. Cardiff at 2026-02-17T17:04:08-05:00
configure: Accept happy-2.2
In Jan 2026 happy-2.2 was released. The most sensible change is https://github.com/haskell/happy/issues/335 which didn't trigger in a fresh build
- - - - -
10b4d364 by Duncan Coutts at 2026-02-17T17:04:52-05:00
Fix errors in the documentation of the eventlog STOP_THREAD status codes
Fix the code for BlockedOnMsgThrowTo.
Document all the known historical warts.
Fixes issue #26867
- - - - -
c5e15b8b by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: use snippets for all list examples
- generate snippet output for docs
- reduce font size to better fit snippets
- Use only directive to guard html snippets
- Add latex snippets for lists
- - - - -
d388bac1 by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: Place the snippet input and output together
- Put the output seemingly inside the example box
- - - - -
016fa306 by Samuel Thibault at 2026-02-18T05:08:35-05:00
Fix linking against libm by moving the -lm option
For those systems that need -lm for getting math functions, this is
currently added on the link line very early, before the object files being
linked together. Newer toolchains enable --as-needed by default, which means
-lm is ignored at that point because no object requires a math function
yet. With such toolchains, we thus have to add -lm after the objects, so the
linker actually includes libm in the link.
- - - - -
68bd0805 by Teo Camarasu at 2026-02-18T05:09:19-05:00
ghc-internal: Move GHC.Internal.Data.Bool to base
This is a tiny module that only defines bool :: Bool -> a -> a -> a. We can just move this to base and delete it from ghc-internal. If we want this functionality there we can just use a case statement or if-then expression.
Resolves 26865
- - - - -
4c40df3d by fendor at 2026-02-20T10:24:48-05:00
Add optional `SrcLoc` to `StackAnnotation` class
`StackAnnotation`s give access to an optional `SrcLoc` field that
user-added stack annotations can use to provide better backtraces in both error
messages and when decoding the callstack.
We update builtin stack annotations such as `StringAnnotation` and
`ShowAnnotation` to also capture the `SrcLoc` of the current `CallStack`
to improve backtraces by default (if stack annotations are used).
This change is backwards compatible with GHC 9.14.1.
- - - - -
fd9aaa28 by Simon Hengel at 2026-02-20T10:25:33-05:00
docs: Fix grammar in explicit_namespaces.rst
- - - - -
44354255 by Vo Minh Thu at 2026-02-20T18:53:06-05:00
GHCi: add a :version command.
This looks like:
ghci> :version
GHCi, version 9.11.20240322
This closes #24576.
Co-Author: Markus Läll <markus.l2ll(a)gmail.com>
- - - - -
eab3dbba by Andreas Klebinger at 2026-02-20T18:53:51-05:00
hadrian/build-cabal: Better respect and utilize -j
* We now respect -j<n> for the cabal invocation to build hadrian rather
than hardcoding -j
* We use the --semaphore flag to ensure cabal/ghc build the hadrian
executable in parallel using the -jsem mechanism.
Saves 10-15s on fresh builds for me.
Fixes #26876
- - - - -
17839248 by Teo Camarasu at 2026-02-24T08:36:03-05:00
ghc-internal: avoid depending on GHC.Internal.Control.Monad.Fix
This module contains the definition of MonadFix, since we want an
instance for IO, that instance requires a lot of machinery and we want
to avoid an orphan instance, this will naturally be quite high up in the
dependency graph.
So we want to avoid other modules depending on it as far as possible.
On Windows, the IO manager depends on the RTSFlags type, which
transtively depends on MonadFix. We refactor things to avoid this
dependency, which would have caused a regression.
Resolves #26875
Metric Decrease:
T12227
- - - - -
fa88d09a by Wolfgang Jeltsch at 2026-02-24T08:36:47-05:00
Refine the imports of `System.IO.OS`
Commit 68bd08055594b8cbf6148a72d108786deb6c12a1 replaced the
`GHC.Internal.Data.Bool` import by a `GHC.Internal.Base` import.
However, while the `GHC.Internal.Data.Bool` import was conditional and
partial, the `GHC.Internal.Base` import is unconditional and total. As a
result, the import list is not tuned to import only the necessary bits
anymore, and furthermore GHC emits a lot of warnings about redundant
imports.
This commit makes the `GHC.Internal.Base` import conditional and partial
in the same way that the `GHC.Internal.Data.Bool` import was.
- - - - -
c951fef1 by Cheng Shao at 2026-02-25T20:58:28+00:00
wasm: add /assets endpoint to serve user-specified assets
This patch adds an `/assets` endpoint to the wasm dyld http server, so
that users can also fetch assets from the same host with sensible
default MIME types, without needing a separate http server for assets
that also introduces CORS headaches:
- A `-fghci-browser-assets-dir` driver flag is added to specify the
assets root directory (defaults to `$PWD`)
- The dyld http server fetches `mime-db` on demand and uses it as
source of truth for mime types.
Closes #26951.
- - - - -
dde22f97 by Sylvain Henry at 2026-02-26T13:14:03-05:00
Fix -fcheck-prim-bounds for non constant args (#26958)
Previously we were only checking bounds for constant (literal)
arguments!
I've refactored the code to simplify the generation of out-of-line Cmm
code for the primop composed of some inline code + some call to an
external Cmm function.
- - - - -
bd3eba86 by Vladislav Zavialov at 2026-02-27T05:48:01-05:00
Check for negative type literals in the type checker (#26861)
GHC disallows negative type literals (e.g., -1), as tested by T8306 and
T8412. This check is currently performed in the renamer:
rnHsTyLit tyLit@(HsNumTy x i) = do
when (i < 0) $
addErr $ TcRnNegativeNumTypeLiteral tyLit
However, this check can be bypassed using RequiredTypeArguments
(see the new test case T26861). Prior to this patch, such programs
caused the compiler to hang instead of reporting a proper error.
This patch addresses the issue by adding an equivalent check in
the type checker, namely in tcHsType.
The diff is deliberately minimal to facilitate backporting. A more
comprehensive rework of HsTyLit is planned for a separate commit.
- - - - -
faf14e0c by Vladislav Zavialov at 2026-02-27T05:48:45-05:00
Consistent pretty-printing of HsString, HsIsString, HsStrTy
Factor out a helper to pretty-print string literals, thus fixing newline
handling for overloaded string literals and type literals.
Test cases: T26860ppr T26860ppr_overloaded T26860ppr_tylit
Follow up to ddf1434ff9bb08cfef3c93f23de6b83ec698aa27
- - - - -
f108a972 by Arnaud Spiwack at 2026-02-27T12:53:01-05:00
Make list comprehension completely non-linear
Fixes #25081
From the note:
The usefulness of list comprehension in conjunction with linear types is dubious.
After all, statements are made to be run many times, for instance in
```haskell
[u | y <- [0,1], stmts]
```
both `u` and `stmts` are going to be run several times.
In principle, though, there are some position in a monad comprehension
expression which could be considered linear. We could try and make it so that
these positions are considered linear by the typechecker, but in practice the
desugarer doesn't take enough care to ensure that these are indeed desugared to
linear sites. We tried in the past, and it turned out that we'd miss a
desugaring corner case (#25772).
Until there's a demand for this very specific improvement, let's instead be
conservative, and consider list comprehension to be completely non-linear.
- - - - -
ae799cab by Simon Jakobi at 2026-02-27T12:53:54-05:00
PmAltConSet: Use Data.Set instead of Data.Map
...to store `PmLit`s.
The Map was only used to map keys to themselves.
Changing the Map to a Set saves a Word of memory per entry.
Resolves #26756.
- - - - -
dcd7819c by Vladislav Zavialov at 2026-02-27T18:46:03-05:00
Drop HsTyLit in favor of HsLit (#26862, #25121)
This patch is a small step towards unification of HsExpr and HsType,
taking care of literals (HsLit) and type literals (HsTyLit).
Additionally, it improves error messages for unsupported type literals,
such as unboxed or fractional literals (test cases: T26862, T26862_th).
Changes to the AST:
* Use HsLit where HsTyLit was previously used
* Use HsChar where HsCharTy was previously used
* Use HsString where HsStrTy was previously used
* Use HsNatural (NEW) where HsNumTy was previously used
* Use HsDouble (NEW) to represent unsupported fractional type literals
Changes to logic:
* Parse unboxed and fractional type literals (to be rejected later)
* Drop the check for negative literals in the renamer (rnHsTyLit)
in favor of checking in the type checker (tc_hs_lit_ty)
* Check for invalid type literals in TH (repTyLit) and report
unrepresentable literals with ThUnsupportedTyLit
* Allow negative type literals in TH (numTyLit). This is fine as
these will be taken care of at splice time (test case: T8306_th)
- - - - -
c927954f by Vladislav Zavialov at 2026-02-27T18:46:50-05:00
Increase test coverage of diagnostics
Add test cases for the previously untested diagnostics:
[GHC-01239] PsErrIfInFunAppExpr
[GHC-04807] PsErrProcInFunAppExpr
[GHC-08195] PsErrInvalidRecordCon
[GHC-16863] PsErrUnsupportedBoxedSumPat
[GHC-18910] PsErrSemiColonsInCondCmd
[GHC-24737] PsErrInvalidWhereBindInPatSynDecl
[GHC-25037] PsErrCaseInFunAppExpr
[GHC-25078] PsErrPrecedenceOutOfRange
[GHC-28021] PsErrRecordSyntaxInPatSynDecl
[GHC-35827] TcRnNonOverloadedSpecialisePragma
[GHC-40845] PsErrUnpackDataCon
[GHC-45106] PsErrInvalidInfixHole
[GHC-50396] PsErrInvalidRuleActivationMarker
[GHC-63930] MultiWayIfWithoutAlts
[GHC-65536] PsErrNoSingleWhereBindInPatSynDecl
[GHC-67630] PsErrMDoInFunAppExpr
[GHC-70526] PsErrLetCmdInFunAppCmd
[GHC-77808] PsErrDoCmdInFunAppCmd
[GHC-86934] ClassPE
[GHC-90355] PsErrLetInFunAppExpr
[GHC-91745] CasesExprWithoutAlts
[GHC-92971] PsErrCaseCmdInFunAppCmd
[GHC-95644] PsErrBangPatWithoutSpace
[GHC-97005] PsErrIfCmdInFunAppCmd
Remove unused error constructors:
[GHC-44524] PsErrExpectedHyphen
[GHC-91382] TcRnIllegalKindSignature
- - - - -
3a9470fd by Torsten Schmits at 2026-02-27T18:47:34-05:00
Avoid expensive computation for debug logging in `mergeDatabases` when log level is low
This computed and traversed a set intersection for every single
dependency unconditionally.
- - - - -
ea4c2cbd by Brandon Chinn at 2026-02-27T16:22:38-08:00
Implement QualifiedStrings (#26503)
See Note [Implementation of QualifiedStrings]
- - - - -
08bc245b by sheaf at 2026-03-01T11:11:54-05:00
Clean up join points, casts & ticks
This commit shores up the logic dealing with casts and ticks occurring
in between a join point binding and a jump.
Fixes #26642 #26929 #26693
Makes progress on #14610 #26157 #26422
Changes:
- Remove 'GHC.Types.Tickish.TickishScoping' in favour of simpler
predicates 'tickishHasNoScope'/'tickishHasSoftScope', as things were
before commit 993975d3. This makes the code easier to read and
document (fewer indirections).
- Introduce 'canCollectArgsThroughTick' for consistent handling of
ticks around PrimOps and other 'Id's that cannot be eta-reduced.
See overhauled Note [Ticks and mandatory eta expansion].
- New Note [JoinId vs TailCallInfo] in GHC.Core.SimpleOpt that explains
robustness of JoinId vs fragility of TailCallInfo.
- Allow casts/non-soft-scoped ticks to occur in between a join point
binder and a jump, but only in Core Prep.
See Note [Join points, casts, and ticks] and
Note [Join points, casts, and ticks... in Core Prep]
in GHC.Core.Opt.Simplify.Iteration.
Also update Core Lint to account for this.
See Note [Linting join points with casts or ticks] in GHC.Core.Lint.
- Update 'GHC.Core.Utils.mergeCaseAlts' to avoid pushing a cast in
between a join point binding and its jumps. This fixes #26642.
See the new (MC5) and (MC6) in Note [Merge Nested Cases].
- Update float out to properly handle source note ticks. They are now
properly floated out instead of being discarded.
This increases the number of ticks in certain tests with -g.
Test cases: T26642 and TrickyJoins.
Metric increase due to more source note ticks with -g:
-------------------------
Metric Increase:
libdir
size_hello_artifact
size_hello_unicode
-------------------------
- - - - -
476c4cdf by Sean D. Gillespie at 2026-03-02T10:14:37-05:00
Add SIMD absolute value on x86 and LLVM
On x86, absolute value of 32 bits or less is implemented with
PABSB/PABSW/PABSD if SSSE3 is available. Otherwise, there is a fallback
for SSE2. For 64 bit integers it uses VPABSQ, required by AVX-512VL,
with fallbacks for SSE4.2 and SSE2.
There is no dedicated instruction for floating point absolute value on
x86, so it is simulated using bitwise AND.
Absolute value for signed integers and floats are implemented by the
"llvm.abs/llvm.fabs" standard library intrinsics. This implementation
uses MachOps constructors, unlike non-vector floating point absolute
value, which uses CallishMachOps.
- - - - -
709448c0 by Sean D. Gillespie at 2026-03-02T10:14:46-05:00
Add SIMD floating point square root
On x86, this is implemented with the SQRTPS and SQRTPD instructions. On
LLVM, it uses the sqrt library intrinstic.
- - - - -
0deadf66 by Sean D. Gillespie at 2026-03-02T10:14:47-05:00
Improve error message for SIMD on aarch64
When encountering vector literals on aarch64, previously it would
throw:
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.15.20251219:
getRegister' (CmmLit:CmmVec):
Now it is more consistent with the other vector operations:
<no location info>: error:
sorry! (unimplemented feature or known bug)
GHC version 9.15.20251219:
SIMD operations on AArch64 currently require the LLVM backend
- - - - -
7d64031b by Vladislav Zavialov at 2026-03-03T11:09:28-05:00
Replace maybeAddSpace with spaceIfSingleQuote
Simplify pretty-printing of HsTypes by using spaceIfSingleQuote.
This allows us to drop the unwieldy lhsTypeHasLeadingPromotionQuote
helper function.
Follow-up to 178c1fd830c78377ef5d338406a41e1d8eb5f0da
- - - - -
598db847 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Correct `hIsReadable` and `hIsWritable` for duplex handles
This contribution implements CLC proposal #371. It changes `hIsReadable`
and `hIsWritable` such that they always throw a respective exception
when encountering a closed or semi-closed handle, not just in the case
of a file handle.
- - - - -
b90201e5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Document `SemiClosedHandle`
- - - - -
c9df72b5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Tell users what “semi-closed” means for duplex handles
- - - - -
a8aa1868 by Ilias Tsitsimpis at 2026-03-06T06:26:29-05:00
Fix determinism of linker arguments
The switch from Data.Map to UniqMap in 3b5be05ac29 introduced
non-determinism in the order of packages passed to the linker.
This resulted in non-reproducible builds where the DT_NEEDED entries in
dynamic libraries were ordered differently across builds.
Fix the regression by explicitly sorting the package list derived from
UniqMap.
Fixes #26838
- - - - -
9b64ad3a by Matthew Pickering at 2026-03-06T06:27:16-05:00
determinism: Use a deterministic renaming when writing bytecode files
Now when writing the bytecode file, a counter and substitution are used
to provide deterministic keys to local variables (rather than relying on
uniques). This change ensures that `.gbc` are produced
deterministically.
Fixes #26499
- - - - -
d29800e0 by Teo Camarasu at 2026-03-06T06:28:46-05:00
ghc-internal: delete Version hs-boot loop
Version has a Read instance which needs Unicode but part of the Unicode interface is the unicode version. This is easy to resolve. We simply don't re-export the version from the Unicode module.
Resolves #26940
- - - - -
ad25af90 by Sylvain Henry at 2026-03-06T06:30:33-05:00
Linker: implement support for COMMON symbols (#6107)
Add some support for COMMON symbols. We don't support common symbols
having different sizes where the larger one is allocated after the
smaller one. The linker will fail with an appropriate error message if
it happens.
- - - - -
3b59f158 by Cheng Shao at 2026-03-06T06:31:16-05:00
compiler: fix redundant import of GHC.Hs.Lit
This patch removes a redundant import of `GHC.Hs.Lit` which causes a
ghc build failure with validate flavours when bootstrapping from 9.14.
Fixes #26972.
- - - - -
148d36f3 by Cheng Shao at 2026-03-06T06:32:01-05:00
compiler: avoid unneeded traversals in GHC.Unit.State
Following !15591, this patch avoids unneeded traversals in
`reportCycles`/`reportUnusable` when log verbosity is below given
threshold. Also applies `logVerbAtLeast` when appropriate.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
7e31367c by Cheng Shao at 2026-03-06T06:32:46-05:00
ghc-internal: fix redundant import in GHC.Internal.Event.Windows.ManagedThreadPool
This patch fixes redundant import in
`GHC.Internal.Event.Windows.ManagedThreadPool` that causes a
compilation error when building windows target with validate flavours
and bootstrapping from 9.14. Fixes #26976.
- - - - -
fc8b8e27 by sheaf at 2026-03-06T06:33:28-05:00
System.Info.fullCompilerVersion: add 'since' annot
Fixes #26973
- - - - -
c8238375 by Sylvain Henry at 2026-03-06T06:34:23-05:00
Hadrian: deprecate --bignum and automatically enable +native_bignum for JS
Deprecate --bignum=... to select the bignum backend. It's only used to
select the native backend, and this can be done with the +native_bignum
flavour transformer.
Additionally, we automatically enable +native_bignum for the JS target
because the GMP backend isn't supported.
- - - - -
a3ac7074 by Sylvain Henry at 2026-03-06T06:35:17-05:00
JS: fix putEnum/fromEnum (#24593)
Don't go through Word16 when serializing Enums.
- - - - -
0b36e96c by Andreas Klebinger at 2026-03-06T06:35:58-05:00
Docs: Document -fworker-wrapper-cbv default setting.
Fixes #26841
- - - - -
eca445e7 by mangoiv at 2026-03-07T05:02:36-05:00
drop deb9/10 from CI, add deb13
debian 9 and 10 are end of life, hence we drop them
from our CI, but we do add debian 13. Jobs that were
previously run on 9 and 10 run on 13, too, jobs that
were run on 10, are run on 11 now. Jobs that were
previously run on debian 12 are run on debian 13 now.
This MR also updates hadrian's bootstrap plans for that
reason.
Metric Decrease:
T9872d
- - - - -
12f8b829 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Fix GHC.Internal.Prim haddock
Haddock used to parse Haskell source to generate documentation,
but switched to using interface files instead. This broke documentation
of the GHC.Internal.Prim module, since it's a wired-in interface that
didn't provide a document structure.
This patch adds the missing document structure and updates genprimopcode
to make the section headers and descriptions available.
fixes #26954
- - - - -
f87e5e57 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Remove obsolete --make-haskell-source from genprimopcode
Now that haddock uses the wired-in interface for GHC.Internal.Prim,
the generated Haskell source file is no longer needed. Remove the
--make-haskell-source code generator from genprimopcode and replace
the generated GHC/Internal/Prim.hs with a minimal static source file.
- - - - -
4a7ddc7b by Sylvain Henry at 2026-03-07T05:04:59-05:00
JS: fix linking of exposed but non-preload units (#24886)
Units exposed in the unit database but not explicitly passed on the
command-line were not considered by the JS linker. This isn't an issue
for cabal which passes every unit explicitly but it is an issue when
using GHC directly (cf T24886 test).
- - - - -
689aafcd by mangoiv at 2026-03-07T05:05:52-05:00
testsuite: double foundation timeout multiplier
The runtime timeout in the foundation test was regularly hit by code
generated by the wasm backend - we increase the timout since the high
runtime is expected on the wasm backend for this rather complex test.
Resolves #26938
- - - - -
a46a1bb1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: add myCapabilityExpr to GHC.Cmm.Utils
This commit adds `myCapabilityExpr` to `GHC.Cmm.Utils` which is
computed from `BaseReg`. It's convenient for codegen logic where one
needs to pass the current Capability's pointer.
- - - - -
4afc65b1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: lower tryPutMVar# into a ccall directly
This patch addresses an old TODO of `stg_tryPutMVarzh` by removing it
completely and making the compiler lower `tryPutMVar#` into a ccall to
`performTryPutMVar` directly, without landing into an intermediate C
or Cmm function. `performTryPutMVar` is promoted to a public RTS
function with default visibility, and the compiler lowering logic
takes into account the C ABI of `performTryPutMVar` and converts from
C Bool to primop's `Int#` result properly.
- - - - -
9e3d6a58 by Simon Hengel at 2026-03-09T04:51:15-04:00
Don't use #line in haddocks
This confuses the parser. Haddock output is unaffected by this change.
(read: this still produces the same documentation)
- - - - -
f4e8fec2 by Wolfgang Jeltsch at 2026-03-09T04:52:01-04:00
Remove in-package dependencies on `GHC.Internal.System.IO`
This contribution eliminates all dependencies on
`GHC.Internal.System.IO` from within `ghc-internal`. It comprises the
following changes:
* Make `GHC.Internal.Fingerprint` independent of I/O support
* Tighten the dependencies of `GHC.Internal.Data.Version`
* Tighten the dependencies of `GHC.Internal.TH.Monad`
* Tighten the dependencies of `GHCi.Helpers`
* Move some code that needs `System.IO` to `template-haskell`
* Move the `GHC.ResponseFile` implementation into `base`
* Move the `System.Exit` implementation into `base`
* Move the `System.IO.OS` implementation into `base`
Metric Decrease:
size_hello_artifact
size_hello_artifact_gzip
size_hello_unicode
size_hello_unicode_gzip
- - - - -
91df4c82 by Sylvain Henry at 2026-03-09T04:53:20-04:00
T18832: fix Windows CI failure by dropping removeDirectoryRecursive
On Windows, open file handles prevent deletion. After killThread, the
closer thread may not have called hClose yet, causing removeDirectoryRecursive
to fail with "permission denied". The test harness cleans up the run
directory anyway, so the call is redundant.
- - - - -
d7fe9671 by Cheng Shao at 2026-03-09T04:54:04-04:00
compiler: fix redundant import in GHC.StgToJS.Object
This patch fixes a redundant import in GHC.StgToJS.Object that causes
a build failure when compiling head from 9.14 with validate flavours.
Fixes #26991.
- - - - -
0bfd29c3 by Cheng Shao at 2026-03-09T04:54:46-04:00
wasm: fix `Illegal foreign declaration` failure when ghci loads modules with JSFFI exports
This patch fixes a wasm ghci error when loading modules with JSFFI
exports; the `backendValidityOfCExport` check in `tcCheckFEType`
should only makes sense and should be performed when not checking the
JavaScript calling convention; otherwise, when the calling convention
is JavaScript, the codegen logic should be trusted to backends that
actually make use of it. Fixes #26998.
- - - - -
e659610c by Duncan Coutts at 2026-03-09T12:08:35-04:00
Apply NOINLINE pragmas to generated Typeable bindings
For context, see the existing Note [Grand plan for Typeable]
and the Note [NOINLINE on generated Typeable bindings] added in the
subsequent commit.
This is about reducing the number of exported top level names and
unfoldings, which reduces interface file sizes and reduces the number of
global/dynamic linker symbols.
Also accept the changed test output and metric decreases.
Tests that record the phase output for type checking or for simplifier
end up with different output: the generated bindings now have an
Inline [~] annotation, and many top level names are now local rather
than module-prefixed for export.
Also accept the numerous metric decreases in compile_time/bytes
allocated, and a few in compile_time/max_bytes_used.
There's also one instance of a decrease in runtime/max_bytes_used but
it's a ghci-way test and so presumably the reason is that it loads
smaller .hi files and/or links fewer symbols.
-------------------------
Metric Decrease:
CoOpt_Singletons
MultiLayerModulesTH_OneShot
MultilineStringsPerf
T10421
T10547
T12150
T12227
T12234
T12425
T13035
T13056
T13253
T13253-spj
T15304
T15703
T16875
T17836b
T17977b
T18140
T18223
T18282
T18304
T18698a
T18698b
T18730
T18923
T20049
T21839c
T24471
T24582
T24984
T3064
T4029
T5030
T5642
T5837
T6048
T9020
T9198
T9961
TcPlugin_RewritePerf
WWRec
hard_hole_fits
mhu-perf
-------------------------
- - - - -
67df5161 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Add documentation Note [NOINLINE on generated Typeable bindings]
and refer to it from the code and existing documentation.
- - - - -
c4ad6167 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Switch existing note to "named wrinkle" style, (GPT1)..(GPT7)
GPT = Grand plan for Typeable
- - - - -
dc84f8e2 by Cheng Shao at 2026-03-09T12:09:21-04:00
ci: only build deb13 for validate pipeline aarch64-linux jobs
This patch drops the redundant aarch64-linux deb12 job from validate pipelines
and only keeps deb13; it's still built in nightly/release pipelines. Closes #27004.
- - - - -
23a50772 by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00
chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad
Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to
GHC.Internal.TH.Monad and delete the Quote module.
Update submodule template-haskell-quasiquoter to use the merged
upstream version that imports from the correct module.
Co-authored-by: Cursor <cursoragent(a)cursor.com>
- - - - -
a2bb6fc3 by Simon Jakobi at 2026-03-10T14:12:23-04:00
Add regression test for #16122
- - - - -
604e1180 by Cheng Shao at 2026-03-11T15:00:42-04:00
hadrian: remove the broken bench flavour
This patch removes the bench flavour from hadrian which has been
broken for years and not used for actual benchmarking (for which
`perf`/`release` is used instead). Closes #26825.
- - - - -
c3e64915 by Simon Jakobi at 2026-03-11T15:01:31-04:00
Add regression test for #18186
The original TypeInType language extension is replaced with
DataKinds+PolyKinds for compatibility.
Closes #18186.
- - - - -
664996c7 by Andreas Klebinger at 2026-03-11T15:02:16-04:00
Bump nofib submodule.
We accrued a number of nofib fixes we want to have here.
- - - - -
517cf64e by Simon Jakobi at 2026-03-11T15:03:03-04:00
Add regression test for #15907
Closes #15907.
- - - - -
fff362cf by Simon Jakobi at 2026-03-11T15:03:49-04:00
Ensure T14272 is run in optasm way
Closes #16539.
- - - - -
ec81ec2c by Simon Jakobi at 2026-03-11T15:03:49-04:00
Add regression test for #24632
Closes #24632.
- - - - -
cefec47b by Simon Jakobi at 2026-03-11T15:03:50-04:00
Fix module name of T9675: T6975 -> T9675
- - - - -
d3690ae8 by Andreas Klebinger at 2026-03-11T15:04:31-04:00
User guide: Clarify phase control on INLINEABLE[foo] pragmas.
Fixes #26851
- - - - -
e7054934 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12694
Closes #12694.
- - - - -
4756d9f6 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #16275
Closes #16275.
- - - - -
34b7e2c1 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14908
Closes #14908.
- - - - -
4243db3d by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14151
Closes #14151.
- - - - -
0e9f1453 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12640
Closes #12640.
- - - - -
ae606c7f by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #15588
Closes #15588.
- - - - -
5a38ce4e by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #9445
Closes #9445.
- - - - -
d054b467 by Cheng Shao at 2026-03-11T15:05:59-04:00
compiler: implement string interning logic for BCONPtrFS
This patch adds a `FastStringEnv`-based cache of `MallocStrings`
requests to `Interp`, so that when we load bytecode with many
breakpoints that share the same module names & unit ids, we reuse the
allocated remote pointers instead of issuing duplicte `MallocStrings`
requests and bloating the C heap. Closes #26995.
- - - - -
b85a0293 by Simon Jakobi at 2026-03-11T15:06:41-04:00
Add perf test for #1216
Closes #1216.
- - - - -
cd7f7420 by Sylvain Henry at 2026-03-11T15:07:58-04:00
JS: check that tuple constructors are linked (#23709)
Test js-mk_tup was failing before because tuple constructors weren't
linked in. It's no longer an issue after the linker fixes.
- - - - -
d57f01a4 by Matthew Pickering at 2026-03-11T15:08:40-04:00
testsuite: Add test for foreign import prim with unboxed tuple return
This commit just adds a test that foreign import prim works with unboxed
sums.
- - - - -
23d111ce by Matthew Pickering at 2026-03-11T15:08:41-04:00
Return a valid pointer in advanceStackFrameLocationzh
When there is no next stack chunk, `advanceStackFrameLocationzh` used to
return NULL in the pointer-typed StackSnapshot# result slot.
Even though the caller treats that case as "no next frame", the result is
still materialized in a GC-visible pointer slot. If a GC observes the raw
NULL there, stack decoding can crash.
Fix this by ensuring the dead pointer slot contains a valid closure
pointer. Also make the optional result explicit by returning an unboxed
sum instead of a tuple with a separate tag.
Fixes #27009
- - - - -
4c58a3ae by Cheng Shao at 2026-03-11T15:09:22-04:00
hadrian: build profiled dynamic objects with -dynamic-too
This patch enables hadrian to build profiled dynamic objects with
`-dynamic-too`, addressing a build parallelism bottleneck in release
pipelines. Closes #27010.
- - - - -
b3d91199 by Zubin Duggal at 2026-03-12T14:22:46+05:30
DmdAnal: Don't give an absent demand signature to an argument if the argument doesn't
also have an absent demand signature in its unfolding.
Otherwise, in some cases we might mark an argument as absent and generate a LitRubbish for
it, but then the function might inline and turn out to actually use this argument, resulting
in a run time crash.
Partially addresses #26416.
There may still be cases where an absent argument turns out to be used due to a rule firing.
- - - - -
1166 changed files:
- .gitignore
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/darwin/nix/sources.json
- .gitlab/darwin/toolchain.nix
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- .gitlab/generate-ci/gen_ci.hs
- + .gitlab/issue_templates/get-verified.md
- .gitlab/jobs.yaml
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- .gitmodules
- CODEOWNERS
- cabal.project-reinstall
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- compiler/GHC/Builtin/PrimOps/Ids.hs
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Linker.hs
- compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/Cmm.hs
- compiler/GHC/Cmm/Info.hs
- compiler/GHC/Cmm/InitFini.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Node.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/Config.hs
- compiler/GHC/CmmToAsm/LA64/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/Ppr.hs
- compiler/GHC/CmmToAsm/Reg/Linear.hs
- compiler/GHC/CmmToAsm/Reg/Linear/StackMap.hs
- compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToAsm/X86/Ppr.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm.hs
- compiler/GHC/CmmToLlvm/Base.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/CmmToLlvm/Data.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/FamInstEnv.hs
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- compiler/GHC/Core/Map/Type.hs
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- compiler/GHC/Core/Opt/CSE.hs
- compiler/GHC/Core/Opt/CprAnal.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/FloatIn.hs
- compiler/GHC/Core/Opt/FloatOut.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
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- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify.hs
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- compiler/GHC/Core/Opt/Simplify/Utils.hs
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- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCo/Tidy.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/TyCon/RecWalk.hs
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unfold/Make.hs
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- compiler/GHC/Core/Utils.hs
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- compiler/GHC/CoreToStg.hs
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- compiler/GHC/CoreToStg/Prep.hs
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- compiler/GHC/Driver/Config/Core/Lint.hs
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- compiler/GHC/Driver/Config/Core/Opt/Simplify.hs
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- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Session.hs
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- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
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- compiler/GHC/HsToCore.hs
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- compiler/GHC/HsToCore/Errors/Types.hs
- compiler/GHC/HsToCore/Expr.hs
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- compiler/GHC/HsToCore/Foreign/Call.hs
- compiler/GHC/HsToCore/Foreign/Decl.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.hs
- compiler/GHC/HsToCore/Foreign/Utils.hs
- compiler/GHC/HsToCore/Foreign/Wasm.hs
- compiler/GHC/HsToCore/GuardedRHSs.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Solver.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/Linker/Dynamic.hs
- compiler/GHC/Linker/Executable.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Linker/MacOS.hs
- compiler/GHC/Linker/Unit.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Parser/String.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/HsType.hs
- + compiler/GHC/Rename/Lit.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Rename/Splice.hs-boot
- compiler/GHC/Rename/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Runtime/Interpreter/C.hs
- compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Interpreter/Wasm.hs
- compiler/GHC/Settings.hs
- compiler/GHC/Settings/IO.hs
- compiler/GHC/Stg/EnforceEpt.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm/Closure.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Linker/Utils.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/GHC/SysTools/Terminal.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Arrow.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Foreign.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Instance/Typeable.hs
- compiler/GHC/Tc/Module.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/FunDeps.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/TyCl.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/BasicTypes.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/CtLoc.hs
- compiler/GHC/Tc/Types/ErrCtxt.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Utils/Env.hs
- compiler/GHC/Tc/Utils/Instantiate.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- − compiler/GHC/Tc/Utils/TcMType.hs-boot
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- + compiler/GHC/Types/Arity.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Id.hs
- compiler/GHC/Types/Id/Info.hs
- compiler/GHC/Types/Id/Make.hs
- + compiler/GHC/Types/InlinePragma.hs
- compiler/GHC/Types/Name.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/SourceText.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/TyThing.hs
- compiler/GHC/Types/Unique/DSet.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Unit/Info.hs
- compiler/GHC/Unit/Module/ModIface.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Error.hs
- compiler/GHC/Utils/Monad.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/GHC/Utils/Ppr/Colour.hs
- compiler/GHC/Utils/Trace.hs
- compiler/Language/Haskell/Syntax/Basic.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- + compiler/Language/Haskell/Syntax/Binds/InlinePragma.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- + compiler/Language/Haskell/Syntax/Decls/Foreign.hs
- + compiler/Language/Haskell/Syntax/Decls/Overlap.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/Lit.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Type.hs
- compiler/ghc.cabal.in
- config.guess
- config.sub
- configure.ac
- distrib/configure.ac.in
- − docs/Makefile
- − docs/storage-mgt/Makefile
- + docs/users_guide/10.0.1-notes.rst
- docs/users_guide/9.16.1-notes.rst
- − docs/users_guide/Makefile
- docs/users_guide/eventlog-formats.rst
- docs/users_guide/exts/explicit_namespaces.rst
- docs/users_guide/exts/multiway_if.rst
- docs/users_guide/exts/pragmas.rst
- + docs/users_guide/exts/qualified_strings.rst
- docs/users_guide/exts/rewrite_rules.rst
- docs/users_guide/exts/roles.rst
- docs/users_guide/exts/table.rst
- docs/users_guide/ghci.rst
- docs/users_guide/index.rst
- docs/users_guide/packages.rst
- docs/users_guide/phases.rst
- docs/users_guide/rtd-theme/layout.html
- docs/users_guide/runtime_control.rst
- docs/users_guide/using-concurrent.rst
- docs/users_guide/using-optimisation.rst
- docs/users_guide/using.rst
- docs/users_guide/wasm.rst
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- − driver/ghc/Makefile
- − driver/ghci/Makefile
- driver/ghci/ghci.c
- − driver/haddock/Makefile
- driver/utils/cwrapper.c
- driver/utils/isMinTTY.c
- − driver/utils/merge_sections.ld
- − driver/utils/merge_sections_pe.ld
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Info.hs
- ghc/Main.hs
- − ghc/Makefile
- hadrian/README.md
- hadrian/bindist/cwrappers/cwrapper.c
- hadrian/bootstrap/generate_bootstrap_plans
- hadrian/bootstrap/plan-9_10_1.json
- hadrian/bootstrap/plan-9_10_2.json
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- hadrian/bootstrap/plan-bootstrap-9_10_1.json
- hadrian/bootstrap/plan-bootstrap-9_10_2.json
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- hadrian/build-cabal
- hadrian/cabal.project
- hadrian/cfg/default.host.target.in
- hadrian/cfg/default.target.in
- hadrian/doc/flavours.md
- hadrian/doc/user-settings.md
- hadrian/hadrian.cabal
- hadrian/src/Base.hs
- hadrian/src/Builder.hs
- hadrian/src/CommandLine.hs
- hadrian/src/Context.hs
- hadrian/src/Flavour.hs
- hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
- hadrian/src/Hadrian/Haskell/Cabal/Type.hs
- hadrian/src/Hadrian/Haskell/Hash.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Main.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Packages.hs
- hadrian/src/Rules.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/CabalReinstall.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Docspec.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Gmp.hs
- − hadrian/src/Rules/Libffi.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Lint.hs
- hadrian/src/Rules/Program.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Rules/SourceDist.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cabal.hs
- hadrian/src/Settings/Builders/Cc.hs
- hadrian/src/Settings/Builders/Configure.hs
- hadrian/src/Settings/Builders/GenPrimopCode.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/Hsc2Hs.hs
- hadrian/src/Settings/Builders/Make.hs
- − hadrian/src/Settings/Builders/MergeObjects.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Builders/SplitSections.hs
- hadrian/src/Settings/Default.hs
- − hadrian/src/Settings/Flavours/Benchmark.hs
- hadrian/src/Settings/Flavours/Development.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Performance.hs
- hadrian/src/Settings/Flavours/Quick.hs
- hadrian/src/Settings/Flavours/QuickCross.hs
- hadrian/src/Settings/Flavours/Quickest.hs
- hadrian/src/Settings/Flavours/Validate.hs
- hadrian/src/Settings/Packages.hs
- hadrian/src/Settings/Program.hs
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- libraries/Cabal
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- libraries/base/changelog.md
- libraries/base/src/Control/Arrow.hs
- libraries/base/src/Control/Concurrent.hs
- libraries/base/src/Data/Array/Byte.hs
- libraries/base/src/Data/Bifoldable1.hs
- libraries/base/src/Data/Bool.hs
- libraries/base/src/Data/Ix.hs
- libraries/base/src/Data/List.hs
- libraries/base/src/Data/List/NubOrdSet.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/Conc.hs
- libraries/base/src/GHC/Conc/Sync.hs
- − libraries/base/src/GHC/Desugar.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- − libraries/base/src/GHC/JS/Prim/Internal/Build.hs
- libraries/base/src/GHC/Num.hs
- − libraries/base/src/GHC/Num/BigNat.hs
- − libraries/base/src/GHC/Num/Integer.hs
- − libraries/base/src/GHC/Num/Natural.hs
- libraries/base/src/GHC/ResponseFile.hs
- libraries/base/src/GHC/Unicode.hs
- libraries/base/src/System/CPUTime/Utils.hs
- libraries/base/src/System/Exit.hs
- libraries/base/src/System/IO.hs
- + libraries/base/src/System/IO/OS.hs
- libraries/base/src/System/Info.hs
- libraries/base/src/System/Timeout.hs
- libraries/base/tests/IO/T12010/cbits/initWinSock.c
- libraries/base/tests/IO/T18832.hs
- libraries/base/tests/IO/all.T
- + libraries/base/tests/IO/osHandles001FileDescriptors.hs
- + libraries/base/tests/IO/osHandles001FileDescriptors.stdout
- + libraries/base/tests/IO/osHandles001WindowsHandles.hs
- + libraries/base/tests/IO/osHandles001WindowsHandles.stdout
- + libraries/base/tests/IO/osHandles002FileDescriptors.hs
- + libraries/base/tests/IO/osHandles002FileDescriptors.stderr
- + libraries/base/tests/IO/osHandles002FileDescriptors.stdin
- + libraries/base/tests/IO/osHandles002FileDescriptors.stdout
- + libraries/base/tests/IO/osHandles002WindowsHandles.hs
- + libraries/base/tests/IO/osHandles002WindowsHandles.stderr
- + libraries/base/tests/IO/osHandles002WindowsHandles.stdin
- + libraries/base/tests/IO/osHandles002WindowsHandles.stdout
- libraries/base/tests/T23454.stderr
- libraries/base/tests/perf/Makefile
- libraries/deepseq
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- libraries/ghc-boot/GHC/Unit/Database.hs
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- libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs
- libraries/ghc-experimental/src/GHC/TypeNats/Experimental.hs
- + libraries/ghc-experimental/tests/Makefile
- + libraries/ghc-experimental/tests/all.T
- + libraries/ghc-experimental/tests/backtraces/Makefile
- + libraries/ghc-experimental/tests/backtraces/T26806a.hs
- + libraries/ghc-experimental/tests/backtraces/T26806a.stderr
- + libraries/ghc-experimental/tests/backtraces/T26806b.hs
- + libraries/ghc-experimental/tests/backtraces/T26806b.stderr
- + libraries/ghc-experimental/tests/backtraces/T26806c.hs
- + libraries/ghc-experimental/tests/backtraces/T26806c.stderr
- + libraries/ghc-experimental/tests/backtraces/all.T
- libraries/ghc-heap/GHC/Exts/Heap/Closures.hs
- libraries/ghc-internal/cbits/Stack.cmm
- libraries/ghc-internal/cbits/consUtils.c
- libraries/ghc-internal/configure.ac
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- libraries/ghc-internal/include/HsIntegerGmp.h.in
- libraries/ghc-internal/src/GHC/Internal/CString.hs
- libraries/ghc-internal/src/GHC/Internal/Classes.hs
- + libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/POSIX.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Conc/Windows.hs
- libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
- libraries/ghc-internal/src/GHC/Internal/Control/Arrow.hs
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- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fix.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Function.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Ix.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Version.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Err.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/ManagedThreadPool.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Exception.hs
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- libraries/ghc-internal/src/GHC/Internal/Exts.hs
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- libraries/ghc-internal/src/GHC/Internal/RTS/Flags/Test.hsc
- − libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs
- + libraries/ghc-internal/src/GHC/Internal/STM.hs
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- libraries/ghc-internal/src/GHC/Internal/System/Environment/ExecutablePath.hsc
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- libraries/ghc-internal/src/GHC/Internal/System/IO.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
- − libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
- libraries/ghc-internal/src/GHC/Internal/Tuple.hs
- libraries/ghc-internal/src/GHC/Internal/TypeError.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode.hs
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- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Exports.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Imports.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Types.hs
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- libraries/haskeline
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- libraries/mtl
- libraries/template-haskell-quasiquoter
- libraries/template-haskell/Language/Haskell/TH/Syntax.hs
- libraries/text
- libraries/transformers
- linters/lint-codes/LintCodes/Static.hs
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- llvm-passes
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- m4/fp_cmm_cpp_cmd_with_args.m4
- − m4/fp_copy_shellvar.m4
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- m4/fptools_happy.m4
- m4/ghc_select_file_extensions.m4
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- mk/system-cxx-std-lib-1.0.conf.in
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[Git][ghc/ghc][wip/sjakobi/T13729] Add regression test for #13729
by Simon Jakobi (＠sjakobi2) 12 Mar '26
by Simon Jakobi (＠sjakobi2) 12 Mar '26
12 Mar '26
Simon Jakobi pushed to branch wip/sjakobi/T13729 at Glasgow Haskell Compiler / GHC
Commits:
c12287eb by Simon Jakobi at 2026-03-12T09:13:46+01:00
Add regression test for #13729
Closes #13729.
- - - - -
11 changed files:
- + testsuite/tests/driver/T13729/A/Setup.hs
- + testsuite/tests/driver/T13729/A/TH.hs
- + testsuite/tests/driver/T13729/A/Types1.hs
- + testsuite/tests/driver/T13729/A/Types2.hs
- + testsuite/tests/driver/T13729/A/p.cabal
- + testsuite/tests/driver/T13729/B/Main.hs
- + testsuite/tests/driver/T13729/B/Setup.hs
- + testsuite/tests/driver/T13729/B/q.cabal
- + testsuite/tests/driver/T13729/Makefile
- + testsuite/tests/driver/T13729/Setup.hs
- + testsuite/tests/driver/T13729/all.T
Changes:
=====================================
testsuite/tests/driver/T13729/A/Setup.hs
=====================================
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
=====================================
testsuite/tests/driver/T13729/A/TH.hs
=====================================
@@ -0,0 +1,8 @@
+{-# LANGUAGE TemplateHaskell #-}
+module TH where
+
+import Language.Haskell.TH
+import Language.Haskell.TH.Syntax
+import Types
+
+th_string = lift . show =<< reify ''Foo
=====================================
testsuite/tests/driver/T13729/A/Types1.hs
=====================================
@@ -0,0 +1,3 @@
+module Types where
+
+data Foo = Bar
=====================================
testsuite/tests/driver/T13729/A/Types2.hs
=====================================
@@ -0,0 +1,3 @@
+module Types where
+
+data Foo = Bar | Baz
=====================================
testsuite/tests/driver/T13729/A/p.cabal
=====================================
@@ -0,0 +1,10 @@
+cabal-version: 2.2
+name: A
+version: 0.1.0.0
+build-type: Simple
+
+library
+ exposed-modules: TH, Types
+ hs-source-dirs: .
+ build-depends: base >=4.14 && <5, template-haskell
+ default-language: Haskell2010
=====================================
testsuite/tests/driver/T13729/B/Main.hs
=====================================
@@ -0,0 +1,6 @@
+{-# LANGUAGE TemplateHaskell #-}
+module Main where
+
+import TH
+
+main = putStrLn $(th_string)
=====================================
testsuite/tests/driver/T13729/B/Setup.hs
=====================================
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
=====================================
testsuite/tests/driver/T13729/B/q.cabal
=====================================
@@ -0,0 +1,10 @@
+cabal-version: 2.2
+name: B
+version: 0.1.0.0
+build-type: Simple
+
+executable B
+ main-is: Main.hs
+ hs-source-dirs: .
+ build-depends: base >=4.14 && <5, A
+ default-language: Haskell2010
=====================================
testsuite/tests/driver/T13729/Makefile
=====================================
@@ -0,0 +1,40 @@
+TOP=../../..
+include $(TOP)/mk/boilerplate.mk
+include $(TOP)/mk/test.mk
+
+SETUP='$(PWD)/Setup' -v0
+CONFIGURE=$(SETUP) configure $(CABAL_MINIMAL_BUILD) --with-ghc='$(TEST_HC)' --with-hc-pkg='$(GHC_PKG)' --ghc-options='$(filter-out -rtsopts,$(TEST_HC_OPTS))' --package-db='$(PWD)/tmp.d' --prefix='$(PWD)/inst' $(VANILLA) $(PROF) $(DYN)
+
+T13729:
+ '$(GHC_PKG)' init tmp.d
+ '$(TEST_HC)' $(TEST_HC_OPTS) -v0 --make Setup
+
+ # Build package A with the first Foo definition.
+ rm -rf A/dist
+ cp A/Types1.hs A/Types.hs
+ (cd A; $(CONFIGURE) --ipid "A-0.1")
+ (cd A; $(SETUP) build)
+ (cd A; $(SETUP) copy)
+ (cd A; $(SETUP) register)
+
+ # Build package B and record the splice output.
+ rm -rf B/dist
+ (cd B; $(CONFIGURE) --ipid "B-0.1")
+ (cd B; $(SETUP) build)
+ (cd B; $(SETUP) copy)
+ (cd B; $(SETUP) register)
+ ./inst/bin/B > out1
+ grep -q Bar out1
+ ! grep -q Baz out1
+
+ # Overwrite Types.hs with the second Foo definition, rebuild A, then rebuild B
+ # without -fforce-recomp.
+ cp A/Types2.hs A/Types.hs
+ (cd A; $(SETUP) build)
+ (cd A; $(SETUP) copy)
+ (cd A; $(SETUP) register)
+ (cd B; $(SETUP) build)
+ (cd B; $(SETUP) copy)
+ (cd B; $(SETUP) register)
+ ./inst/bin/B > out2
+ grep -q Baz out2
=====================================
testsuite/tests/driver/T13729/Setup.hs
=====================================
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
=====================================
testsuite/tests/driver/T13729/all.T
=====================================
@@ -0,0 +1,19 @@
+if config.have_vanilla:
+ vanilla = '--enable-library-vanilla'
+else:
+ vanilla = '--disable-library-vanilla'
+
+if config.have_profiling:
+ prof = '--enable-library-profiling'
+else:
+ prof = '--disable-library-profiling'
+
+if not config.compiler_profiled and config.have_dynamic:
+ dyn = '--enable-shared'
+else:
+ dyn = '--disable-shared'
+
+test('T13729', [extra_files(['A', 'B', 'Setup.hs']),
+ when(fast(), skip)],
+ run_command,
+ ['$MAKE -s --no-print-directory T13729 VANILLA=' + vanilla + ' PROF=' + prof + ' DYN=' + dyn])
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[Git][ghc/ghc][ghc-9.12] 25 commits: OccAnal: Be stricter for better compiler perf.
by Zubin (＠wz1000) 12 Mar '26
by Zubin (＠wz1000) 12 Mar '26
12 Mar '26
Zubin pushed to branch ghc-9.12 at Glasgow Haskell Compiler / GHC
Commits:
22334776 by Andreas Klebinger at 2026-03-11T11:04:15+05:30
OccAnal: Be stricter for better compiler perf.
In particular we are now stricter:
* When combining usageDetails.
* When computing binder info.
In combineUsageDetails when combining the underlying adds we compute a
new `LocalOcc` for each entry by combining the two existing ones.
Rather than wait for those entries to be forced down the road we now
force them immediately. Speeding up T26425 by about 10% with little
effect on the common case.
We also force binders we put into the Core AST everywhere now.
Failure to do so risks leaking the occ env used to set the binders
OccInfo.
For T26425 compiler residency went down by a factor of ~10x.
Compile time also improved by a factor of ~1.6.
-------------------------
Metric Decrease:
T18698a
T26425
T9233
-------------------------
(cherry picked from commit f997618e08ce5aad8b7564b8073889b52bc18700)
- - - - -
69cdf81a by Andreas Klebinger at 2026-03-11T11:04:24+05:30
Add a perf test for #26425
(cherry picked from commit 4038a28b8594ae91c000d5bc7fceed4815eb4826)
- - - - -
56a259ec by sheaf at 2026-03-11T11:05:48+05:30
Update assigned register format when spilling
When we come to spilling a register to put new data into it, in
GHC.CmmToAsm.Reg.Linear.allocRegsAndSpill_spill, we need to:
1. Spill the data currently in the register. That is, do a spill
with a format that matches what's currently in the register.
2. Update the register assignment, allocating a virtual register to
this real register, but crucially **updating the format** of this
assignment.
Due to shadowing in the Haskell code for allocRegsAndSpill_spill, we
were mistakenly re-using the old format. This could lead to a situation
where:
a. We were using xmm6 to store a Double#.
b. We want to store a DoubleX2# into xmm6, so we spill the current
content of xmm6 to the stack using a scalar move (correct).
c. We update the register assignment, but we fail to update the format
of the assignment, so we continue to think that xmm6 stores a
Double# and not a DoubleX2#.
d. Later on, we need to spill xmm6 because it is getting clobbered by
another instruction. We then decide to only spill the lower 64 bits
of the register, because we still think that xmm6 only stores a
Double# and not a DoubleX2#.
Fixes #26542
(cherry picked from commit 79dfcfe008af5e04c0f51cc2a3709ee08aebd59b)
- - - - -
48836e62 by sheaf at 2026-03-11T11:06:00+05:30
localRegistersConflict: account for assignment LHS
This commit fixes a serious oversight in GHC.Cmm.Sink.conflicts,
specifically the code that computes which local registers conflict
between an assignment and a Cmm statement.
If we have:
assignment: <local_reg> = <expr>
node: <local_reg> = <other_expr>
then clearly the two conflict, because we cannot move one statement past
the other, as they assign two different values to the same local
register. (Recall that 'conflicts (local_reg,expr) node' is False if and
only if the assignment 'local_reg = expr' can be safely commuted past
the statement 'node'.)
The fix is to update 'GHC.Cmm.Sink.localRegistersConflict' to take into
account the following two situations:
(1) 'node' defines the LHS local register of the assignment,
(2) 'node' defines a local register used in the RHS of the assignment.
The bug is precisely that we were previously missing condition (1).
Fixes #26550
(cherry picked from commit 43fa8be89bdccbbe730daf0be7bdae8dde99ce44)
- - - - -
046d8a80 by ARATA Mizuki at 2026-03-11T11:06:12+05:30
Fix the order of spill/reload instructions
The AArch64 NCG could emit multiple instructions for a single spill/reload,
but their order was not consistent between the definition and a use.
Fixes #26537
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
(cherry picked from commit aada5db93a2f0fd00c0715ad9ca4f666ffb3d9d8)
- - - - -
f538aea7 by Luite Stegeman at 2026-03-11T11:07:02+05:30
rts: Handle overflow of ELF section header string table
If the section header string table is stored in a section greater
than or equal to SHN_LORESERVE (0xff00), the 16-bit field e_shstrndx
in the ELF header does not contain the section number, but rather
an overflow value SHN_XINDEX (0xffff) indicating that we need to look
elsewhere.
This fixes the linker by not using e_shstrndx directly but calling
elf_shstrndx, which correctly handles the SHN_XINDEX value.
Fixes #26603
(cherry picked from commit c71faa7697f2d0bc8b92173aeb1f063ca8ed235a)
- - - - -
3081de58 by Peter Trommler at 2026-03-11T11:07:13+05:30
PPC NCG: Fix shift right MO code
The shift amount in shift right [arithmetic] MOs is machine word
width. Therefore remove unnecessary zero- or sign-extending of
shift amount.
It looks harmless to extend the shift amount argument because the
shift right instruction uses only the seven lowest bits (i. e. mod 128).
But now we have a conversion operation from a smaller type to word width
around a memory load at word width. The types are not matching up but
there is no check done in CodeGen. The necessary conversion from word
width down to the smaller width would be translated into a no-op on
PowerPC anyway. So all seems harmless if it was not for a small
optimisation in getRegister'.
In getRegister' a load instruction with the smaller width of the
conversion operation was generated. This loaded the most significant
bits of the word in memory on a big-endian platform. These bits were
zero and hence shift right was used with shift amount zero and not one
as required in test Sized.
Fixes #26519
(cherry picked from commit c1fe009739da8b368e59b87b00d7c568ab571643)
- - - - -
d3c9cd0f by Aaron Allen at 2026-03-11T11:10:02+05:30
[#26183] Associated Type Iface Fix
When determining "extras" for class decl interface entries, axioms for
the associated types need to included so that dependent modules will be
recompiled if those axioms change.
resolves #26183
(cherry picked from commit 8a317b6f6d007b7cb5f2d661849383042892b3d8)
- - - - -
00ad5059 by Aaron Allen at 2026-03-11T11:11:02+05:30
[26705] Include TyCl instances in data fam iface entry
Ensures dependent modules are recompiled when the class instances for a
data family instance change.
resolves #26705
(cherry picked from commit 8a3900a325a8f476d1e31a84deeab934b9161801)
- - - - -
9a3dc83e by Vladislav Zavialov at 2026-03-11T11:11:45+05:30
Check for negative type literals in the type checker (#26861)
GHC disallows negative type literals (e.g., -1), as tested by T8306 and
T8412. This check is currently performed in the renamer:
rnHsTyLit tyLit@(HsNumTy x i) = do
when (i < 0) $
addErr $ TcRnNegativeNumTypeLiteral tyLit
However, this check can be bypassed using RequiredTypeArguments
(see the new test case T26861). Prior to this patch, such programs
caused the compiler to hang instead of reporting a proper error.
This patch addresses the issue by adding an equivalent check in
the type checker, namely in tcHsType.
The diff is deliberately minimal to facilitate backporting. A more
comprehensive rework of HsTyLit is planned for a separate commit.
(cherry picked from commit bd3eba86180083a3bd1633994b9e6cd3be501a1d)
- - - - -
1945b61d by Sylvain Henry at 2026-03-11T11:13:17+05:30
Linker: implement support for COMMON symbols (#6107)
Add some support for COMMON symbols. We don't support common symbols
having different sizes where the larger one is allocated after the
smaller one. The linker will fail with an appropriate error message if
it happens.
(cherry picked from commit ad25af90bdbf1269ff9febbcbc9fffa804b11bda)
- - - - -
40f0623b by sheaf at 2026-03-11T11:13:35+05:30
System.Info.fullCompilerVersion: add 'since' annot
Fixes #26973
(cherry picked from commit fc8b8e27398b4d9d901fb65d15a7d8b23df428b8)
- - - - -
02a98d4a by sheaf at 2026-03-11T12:29:53+05:30
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
(cherry picked from commit d99eb7cd157e0d8e1dedfa862161502755c26e5b)
- - - - -
f0244f6a by Recursion Ninja at 2026-03-11T13:45:10+05:30
Resolving issues #20645 and #26109
Correctly sign extending and casting smaller bit width types for LLVM operations:
- bitReverse8#
- bitReverse16#
- bitReverse32#
- byteSwap16#
- byteSwap32#
- pdep8#
- pdep16#
- pext8#
- pext16#
(cherry picked from commit 706d33e38fbdcea3f84c34c727c55cfb98c74990)
- - - - -
062de3a5 by Alex Washburn at 2026-03-11T13:56:36+05:30
Correcting LLVM linking of Intel BMI intrinsics pdep{8,16} and pext{8,16}.
This patch fixes #26065.
The LLVM interface does not expose bindings to:
- llvm.x86.bmi.pdep.8
- llvm.x86.bmi.pdep.16
- llvm.x86.bmi.pext.8
- llvm.x86.bmi.pext.16
So calls are instead made to llvm.x86.bmi.{pdep,pext}.32 in these cases,
with pre/post-operation truncation to constrain the logical value range.
(cherry picked from commit 0a601c30d5e885d9b15b202f1fce55ca263315fb)
- - - - -
c1883c7e by Zubin Duggal at 2026-03-11T14:25:36+05:30
Revert "Don't re-use stack slots for growing registers"
This reverts commit 59cc8e6823e7ebe13525fe47b57967b19fc6ff41.
- - - - -
01e4bbdb by sheaf at 2026-03-11T14:26:11+05:30
X86 CodeGen: fix assign_eax_sse_regs
We must set %al to the number of SSE2 registers that contain arguments
(in case we are dealing with a varargs function). The logic for counting
how many arguments reside in SSE2 registers was incorrect, as it used
'isFloatFormat', which incorrectly ignores vector registers.
We now instead do case analysis on the register class:
is_sse_reg r =
case targetClassOfReg platform r of
RcFloatOrVector -> True
RcInteger -> False
This change is necessary to prevent segfaults in T20030_test1j, because
subsequent commits change the format calculations, resulting in vector
formats more often.
(cherry picked from commit fca9cd7ce4abc4320c66f6a619063b2c66890504)
- - - - -
bf3aa49f by sheaf at 2026-03-11T14:26:24+05:30
X86 regUsageOfInstr: fix format for IMUL
When used with 8-bit operands, the IMUL instruction returns the result
in the lower 16 bits of %rax (also known as %ax). This is different
than for the other sizes, where an input at 16, 32 or 64 bits will
result in 16, 32 or 64 bits of output in both %rax and %rdx.
This doesn't affect the behaviour of the compiler, because we don't
allow partial writes at sub-word sizes. The rationale is explained
in Wrinkle [Don't allow scalar partial writes] in Note [Register formats in liveness analysis],
in GHC.CmmToAsm.Reg.Liveness.
(cherry picked from commit 53150617c8648635b0fbfc4144f04c53e7180a60)
- - - - -
d999d711 by sheaf at 2026-03-11T15:00:34+05:30
Liveness analysis: consider register formats
This commit updates the register allocator to be a bit more careful in
situations in which a single register is used at multiple different
formats, e.g. when xmm1 is used both to store a Double# and a DoubleX2#.
This is done by introducing the 'Regs' newtype around 'UniqSet RegWithFormat',
for which the combining operations take the larger of the two formats
instead of overriding the format.
Operations on 'Regs' are defined in 'GHC.CmmToAsm.Reg.Regs'. There is
a modest compile-time cost for the additional overhead for tracking
register formats, which causes the metric increases of this commit.
The subtle aspects of the implementation are outlined in
Note [Register formats in liveness analysis] in GHC.CmmToAsm.Reg.Liveness.
Fixes #26411 #26611
-------------------------
Metric Increase:
T12707
T26425
T3294
-------------------------
(cherry picked from commit c7a56dd1ea2b8bd4cd9dc4a46e07c589db559383)
- - - - -
38e53aea by sheaf at 2026-03-11T15:03:55+05:30
Register allocator: reload at same format as spill
This commit ensures that if we spill a register onto the stack at a
given format, we then always reload the register at this same format.
This ensures we don't end up in a situation where we spill F64x2 but end
up only reloading the lower F64. This first reload would make us believe
the whole data is in a register, thus silently losing the upper 64 bits
of the spilled register's contents.
Fixes #26526
(cherry picked from commit c2e83339593bc31a82a0fdb7f11fa693324f9804)
- - - - -
254008d7 by sheaf at 2026-03-11T15:04:06+05:30
Register allocation: writes redefine format
As explained in Note [Allocated register formats] in GHC.CmmToAsm.Reg.Linear,
we consider all writes to redefine the format of the register.
This ensures that in a situation such as
movsd .Ln6m(%rip),%v1
shufpd $0,%v1,%v1
we properly consider the broadcast operation to change the format of %v1
from F64 to F64x2.
This completes the fix to #26411 (test in T26411b).
(cherry picked from commit 55ab583b40ecdc1abc3307cea1d6a2c958a5ed29)
- - - - -
5f311f5e by sheaf at 2026-03-11T15:04:18+05:30
Don't re-use stack slots for growing registers
This commit avoids re-using a stack slot for a register that has grown
but already had a stack slot.
For example, suppose we have stack slot assigments
%v1 :: FF64 |-> StackSlot 0
%v2 :: FF64 |-> StackSlot 1
Later, we start using %v1 at a larger format (e.g. F64x2) and we need
to spill it again. Then we **must not** use StackSlot 0, as a spill
at format F64x2 would clobber the data in StackSlot 1.
This can cause some fragmentation of the `StackMap`, but that's probably
OK.
Fixes #26668
(cherry picked from commit 023c301c51e7346af3d4d773c448277ad3645ad2)
- - - - -
11be0bb5 by Simon Peyton Jones at 2026-03-11T15:27:16+05:30
Fix scoping errors in specialisation
Using -fspecialise-aggressively in #26682 showed up a couple of
subtle errors in the type-class specialiser.
* dumpBindUDs failed to call `deleteCallsMentioning`, resulting in a
call that mentioned a dictionary that was not in scope. This call
has been missing since 2009!
commit c43c981705ec33da92a9ce91eb90f2ecf00be9fe
Author: Simon Peyton Jones <simonpj(a)microsoft.com>
Date: Fri Oct 23 16:15:51 2009 +0000
Fixed by re-combining `dumpBindUDs` and `dumpUDs`.
* I think there was another bug involving the quantified type
variables in polymorphic specialisation. In any case I refactored
`specHeader` and `spec_call` so that the former looks for the
extra quantified type variables rather than the latter. This
is quite a worthwhile simplification: less code, easier to grok.
Test case in simplCore/should_compile/T26682,
brilliantly minimised by @sheaf.
(cherry picked from commit 641ec3f01974dff9dfd756f3f0499796c8df1a8b)
- - - - -
2f5da16e by Zubin Duggal at 2026-03-11T15:30:20+05:30
Revert "rts: fix eager black holes: record mutated closure and fix assertion"
This reverts commit f162eb8f08fa661183c5168cce077d5e9b4ebc03.
- - - - -
097556ce by Zubin Duggal at 2026-03-12T00:21:29+05:30
Release notes for 9.12.4
Metric Increase:
T4801
- - - - -
94 changed files:
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/Cmm/Sink.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/Reg/Graph.hs
- compiler/GHC/CmmToAsm/Reg/Graph/Coalesce.hs
- compiler/GHC/CmmToAsm/Reg/Graph/Spill.hs
- compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs
- compiler/GHC/CmmToAsm/Reg/Linear.hs
- compiler/GHC/CmmToAsm/Reg/Linear/Base.hs
- compiler/GHC/CmmToAsm/Reg/Linear/JoinToTargets.hs
- compiler/GHC/CmmToAsm/Reg/Liveness.hs
- + compiler/GHC/CmmToAsm/Reg/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Target.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Types/Unique/FM.hs
- compiler/GHC/Types/Unique/Set.hs
- compiler/GHC/Types/Var/Env.hs
- compiler/ghc.cabal.in
- docs/users_guide/9.12.4-notes.rst
- docs/users_guide/exts/named_defaults.rst
- libraries/base/src/System/Info.hs
- rts/Linker.c
- rts/LinkerInternals.h
- rts/ThreadPaused.c
- rts/linker/Elf.c
- rts/linker/MachO.c
- rts/linker/PEi386.c
- rts/prim/pdep.c
- + testsuite/tests/codeGen/should_run/T26537.hs
- + testsuite/tests/codeGen/should_run/T26537.stdout
- testsuite/tests/codeGen/should_run/all.T
- + testsuite/tests/default/T25882.hs
- testsuite/tests/default/all.T
- testsuite/tests/default/default-fail01.stderr
- testsuite/tests/default/default-fail02.stderr
- testsuite/tests/default/default-fail04.stderr
- testsuite/tests/default/default-fail08.stderr
- + testsuite/tests/driver/recomp26183/M.hs
- + testsuite/tests/driver/recomp26183/M2A.hs
- + testsuite/tests/driver/recomp26183/M2B.hs
- + testsuite/tests/driver/recomp26183/Makefile
- + testsuite/tests/driver/recomp26183/all.T
- + testsuite/tests/driver/recomp26183/recomp26183.stderr
- + testsuite/tests/driver/recomp26705/M.hs
- + testsuite/tests/driver/recomp26705/M2A.hs
- + testsuite/tests/driver/recomp26705/M2B.hs
- + testsuite/tests/driver/recomp26705/Makefile
- + testsuite/tests/driver/recomp26705/all.T
- + testsuite/tests/driver/recomp26705/recomp26705.stderr
- + testsuite/tests/llvm/should_run/T20645.hs
- + testsuite/tests/llvm/should_run/T20645.stdout
- + testsuite/tests/llvm/should_run/T26065.hs
- + testsuite/tests/llvm/should_run/T26065.stdout
- testsuite/tests/llvm/should_run/all.T
- testsuite/tests/numeric/should_run/foundation.hs
- + testsuite/tests/perf/compiler/T26425.hs
- testsuite/tests/perf/compiler/all.T
- testsuite/tests/rts/linker/Makefile
- + testsuite/tests/rts/linker/T6107.hs
- + testsuite/tests/rts/linker/T6107.stdout
- + testsuite/tests/rts/linker/T6107_sym1.s
- + testsuite/tests/rts/linker/T6107_sym2.s
- testsuite/tests/rts/linker/all.T
- + testsuite/tests/simd/should_run/T26411.hs
- + testsuite/tests/simd/should_run/T26411.stdout
- + testsuite/tests/simd/should_run/T26411b.hs
- + testsuite/tests/simd/should_run/T26411b.stdout
- + testsuite/tests/simd/should_run/T26542.hs
- + testsuite/tests/simd/should_run/T26542.stdout
- + testsuite/tests/simd/should_run/T26550.hs
- + testsuite/tests/simd/should_run/T26550.stdout
- testsuite/tests/simd/should_run/all.T
- + testsuite/tests/simplCore/should_compile/T26682.hs
- + testsuite/tests/simplCore/should_compile/T26682a.hs
- testsuite/tests/simplCore/should_compile/all.T
- + testsuite/tests/typecheck/should_fail/T26861.hs
- + testsuite/tests/typecheck/should_fail/T26861.stderr
- testsuite/tests/typecheck/should_fail/all.T
- utils/genprimopcode/Lexer.x
- utils/genprimopcode/Main.hs
- utils/genprimopcode/Parser.y
- utils/genprimopcode/ParserM.hs
- utils/genprimopcode/Syntax.hs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/1070cf051bc110175dd29bc142d4fe…
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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 5 commits: ghc-internal: move bits Weak of finalizer interface to base
by Marge Bot (＠marge-bot) 11 Mar '26
by Marge Bot (＠marge-bot) 11 Mar '26
11 Mar '26
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
f8c24b51 by Teo Camarasu at 2026-03-12T01:26:31-04:00
ghc-internal: move bits Weak of finalizer interface to base
We move parts of the Weak finalizer interface to `base` only the parts
that the RTS needs to know about are kept in `ghc-internal`.
This lets us then prune our imports somewhat and get rid of some SOURCE imports.
Resolves #26985
- - - - -
e1b8e539 by Sylvain Henry at 2026-03-12T01:27:01-04:00
Stg/Unarise: constant-folding during unarisation (#25650)
When building an unboxed sum from a literal argument, mkUbxSum
previously emitted a runtime cast via `case primop [lit] of var -> ...`.
This wrapper prevented GHC from recognising the result as a static
StgRhsCon, causing top-level closures to be allocated as thunks instead
of being statically allocated.
Fix: try to perform the numeric literal cast at compile time using
mkLitNumberWrap (wrapping semantics). If successful, return the cast
literal directly with an identity wrapper (no case expression). The
runtime cast path is kept as fallback for non-literal arguments.
Test: codeGen/should_compile/T25650
- - - - -
25ae85a8 by Sylvain Henry at 2026-03-12T01:27:07-04:00
T17912: wait for opener thread to block before killing it (#24739)
Instead of a fixed 1000ms delay, poll threadStatus until the opener
thread is in BlockedOnForeignCall, ensuring killThread only fires once
the thread is provably inside the blocking open() syscall. This prevents
the test from accidentally passing on Windows due to scheduling races.
- - - - -
62fe65ba by Cheng Shao at 2026-03-12T01:27:07-04:00
template-haskell: fix redundant import in Language.Haskell.TH.Quote
This patch fixes a redundant import in `Language.Haskell.TH.Quote`
that causes a ghc build failure when bootstrapping from 9.14 with
validate flavours. Fixes #27014.
- - - - -
6af6ba92 by Brandon Simmons at 2026-03-12T01:27:19-04:00
Add a cumulative gc_sync_elapsed_ns counter to GHC.Internal.Stats
This makes it possible to get an accurate view of time spent in sync
phase when using prometheus-style sampling. Previously this was only
available for the most recent GC.
This intentionally leaves GHC.Stats API unchanged since it is marked as
deprecated, and API changes there require CLC approval.
Fixes #26944
- - - - -
25 changed files:
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Unarise.hs
- libraries/base/src/GHC/Stats.hs
- libraries/base/src/GHC/Weak.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- − libraries/base/src/GHC/Weak/Finalizehs
- libraries/base/src/System/Mem/Weak.hs
- libraries/base/tests/IO/T17912.hs
- libraries/base/tests/IO/all.T
- libraries/ghc-internal/CHANGELOG.md
- − libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs-boot
- − libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Stats.hsc
- libraries/ghc-internal/src/GHC/Internal/TopHandler.hs
- libraries/ghc-internal/src/GHC/Internal/Weak.hs
- libraries/ghc-internal/src/GHC/Internal/Weak/Finalize.hs
- libraries/template-haskell/Language/Haskell/TH/Quote.hs
- rts/Stats.c
- rts/include/RtsAPI.h
- testsuite/tests/codeGen/should_compile/Makefile
- + testsuite/tests/codeGen/should_compile/T25650.hs
- + testsuite/tests/codeGen/should_compile/T25650.stdout
- testsuite/tests/codeGen/should_compile/all.T
- testsuite/tests/interface-stability/ghc-experimental-exports.stdout
- testsuite/tests/interface-stability/ghc-experimental-exports.stdout-mingw32
Changes:
=====================================
compiler/GHC/Stg/Pipeline.hs
=====================================
@@ -143,7 +143,7 @@ stg2stg logger extra_vars opts this_mod binds
StgUnarise -> do
us <- getUniqueSupplyM
liftIO (stg_linter False "Pre-unarise" binds)
- let binds' = {-# SCC "StgUnarise" #-} unarise us (stgPipeline_allowTopLevelConApp opts this_mod) binds
+ let binds' = {-# SCC "StgUnarise" #-} unarise (stgPlatform opts) us (stgPipeline_allowTopLevelConApp opts this_mod) binds
liftIO (dump_when Opt_D_dump_stg_unarised "Unarised STG:" binds')
liftIO (stg_linter True "Unarise" binds')
return binds'
=====================================
compiler/GHC/Stg/Unarise.hs
=====================================
@@ -413,6 +413,7 @@ import Data.Maybe (mapMaybe)
import qualified Data.IntMap as IM
import GHC.Builtin.PrimOps
import GHC.Builtin.PrimOps.Casts
+import GHC.Platform
import Data.List (mapAccumL)
-- import GHC.Utils.Trace
@@ -441,12 +442,13 @@ import Data.List (mapAccumL)
-- (i.e. no unboxed tuples, sums or voids)
--
data UnariseEnv = UnariseEnv
- { ue_rho :: (VarEnv UnariseVal)
+ { ue_platform :: !Platform
+ , ue_rho :: VarEnv UnariseVal
, ue_allow_static_conapp :: DataCon -> [StgArg] -> Bool
}
-initUnariseEnv :: VarEnv UnariseVal -> (DataCon -> [StgArg] -> Bool) -> UnariseEnv
-initUnariseEnv = UnariseEnv
+initUnariseEnv :: Platform -> VarEnv UnariseVal -> (DataCon -> [StgArg] -> Bool) -> UnariseEnv
+initUnariseEnv platform rho is_dll = UnariseEnv platform rho is_dll
data UnariseVal
= MultiVal [OutStgArg] -- MultiVal to tuple. Can be empty list (void).
@@ -479,8 +481,8 @@ lookupRho env v = lookupVarEnv (ue_rho env) v
--------------------------------------------------------------------------------
-unarise :: UniqSupply -> (DataCon -> [StgArg] -> Bool) -> [StgTopBinding] -> [StgTopBinding]
-unarise us is_dll_con_app binds = initUs_ us (mapM (unariseTopBinding (initUnariseEnv emptyVarEnv is_dll_con_app)) binds)
+unarise :: Platform -> UniqSupply -> (DataCon -> [StgArg] -> Bool) -> [StgTopBinding] -> [StgTopBinding]
+unarise platform us is_dll_con_app binds = initUs_ us (mapM (unariseTopBinding (initUnariseEnv platform emptyVarEnv is_dll_con_app)) binds)
unariseTopBinding :: UnariseEnv -> StgTopBinding -> UniqSM StgTopBinding
unariseTopBinding rho (StgTopLifted bind)
@@ -627,7 +629,7 @@ unariseUbxSumOrTupleArgs rho us dc args ty_args
| isUnboxedSumDataCon dc
, let args1 = assert (isSingleton args) (unariseConArgs rho args)
- = let (args2, cast_wrapper) = mkUbxSum dc ty_args args1 us
+ = let (args2, cast_wrapper) = mkUbxSum (ue_platform rho) dc ty_args args1 us
in (args2, Just cast_wrapper)
| otherwise
@@ -848,29 +850,29 @@ mapSumIdBinders alt_bndr args rhs rho0
-- right type.
-- Select only the args which contain parts of the current field.
id_arg_exprs = [ args !! i | i <- layout1 ]
- id_vars = [v | StgVarArg v <- id_arg_exprs]
- typed_id_arg_input = assert (equalLength id_vars fld_reps) $
- zip3 id_vars fld_reps uss
-
- mkCastInput :: (Id,PrimRep,UniqSupply) -> ([(PrimOp,Type,Unique)],Id,Id)
- mkCastInput (id,rep,bndr_us) =
- let (ops,types) = unzip $ getCasts (typePrimRepU $ idType id) rep
+ typed_id_arg_input = assert (equalLength id_arg_exprs fld_reps) $
+ zip3 id_arg_exprs fld_reps uss
+
+ -- Process each (arg, target rep, unique supply) to produce
+ -- (rhs wrapper, typed arg). Handles both literal and variable args.
+ -- Literal args can arise after constant-folding in mkUbxSum
+ -- (see Note [Constant-folding during unarisation]).
+ mkCastArg :: (StgArg, PrimRep, UniqSupply) -> (StgExpr -> StgExpr, StgArg)
+ mkCastArg (StgLitArg lit, rep, _us)
+ | Just lit' <- castLiteralArg (ue_platform rho0) rep lit
+ = (id, StgLitArg lit')
+ | otherwise = pprPanic "mapSumIdBinders: cannot cast literal" (ppr lit $$ ppr rep)
+ mkCastArg (StgVarArg v, rep, bndr_us) =
+ let (ops,types) = unzip $ getCasts (typePrimRepU $ idType v) rep
cst_opts = zip3 ops types $ uniqsFromSupply bndr_us
out_id = case cst_opts of
- [] -> id
- _ -> let (_,ty,uq) = last cst_opts
- in mkCastVar uq ty
- in (cst_opts,id,out_id)
-
- cast_inputs = map mkCastInput typed_id_arg_input
- (rhs_with_casts,typed_ids) = mapAccumL cast_arg (\x->x) cast_inputs
- where
- cast_arg rhs_in (cast_ops,in_id,out_id) =
- let rhs_out = castArgRename cast_ops (StgVarArg in_id)
- in (rhs_in . rhs_out, out_id)
+ [] -> v
+ _ -> let (_,ty,uq) = last cst_opts in mkCastVar uq ty
+ in (castArgRename cst_opts (StgVarArg v), StgVarArg out_id)
- typed_id_args = map StgVarArg typed_ids
+ (wrappers, typed_id_args) = unzip $ map mkCastArg typed_id_arg_input
+ rhs_with_casts = foldr (.) id wrappers
if isMultiValBndr alt_bndr
then return (extendRho rho0 alt_bndr (MultiVal typed_id_args), rhs_with_casts rhs)
@@ -913,14 +915,15 @@ mkCast arg_in cast_op out_id out_ty in_rhs =
--
mkUbxSum
:: HasDebugCallStack
- => DataCon -- Sum data con
+ => Platform -- For compile-time constant-folding
+ -> DataCon -- Sum data con
-> [[PrimRep]] -- Representations of type arguments of the sum data con
-> [OutStgArg] -- Actual arguments of the alternative.
-> UniqSupply
-> ([OutStgArg] -- Final tuple arguments
,(StgExpr->StgExpr) -- We might need to cast the args first
)
-mkUbxSum dc ty_args args0 us
+mkUbxSum platform dc ty_args args0 us
= let
tag_slot :| sum_slots = ubxSumRepType ty_args
-- drop tag slot
@@ -961,6 +964,11 @@ mkUbxSum dc ty_args args0 us
, ubxSumRubbishArg slot)
castArg :: UniqSupply -> SlotTy -> StgArg -> Maybe (StgArg,UniqSupply,StgExpr -> StgExpr)
+ castArg us slot_ty arg@(StgLitArg lit)
+ -- See Note [Constant-folding during unarisation]
+ | slotPrimRep slot_ty /= stgArgRepU arg
+ , Just lit' <- castLiteralArg platform (slotPrimRep slot_ty) lit
+ = Just (StgLitArg lit', us, id)
castArg us slot_ty arg
-- Cast the argument to the type of the slot if required
| slotPrimRep slot_ty /= stgArgRepU arg
@@ -1006,6 +1014,101 @@ ubxSumRubbishArg DoubleSlot = StgLitArg (LitDouble 0)
ubxSumRubbishArg (VecSlot n e) = StgLitArg (LitRubbish TypeLike vec_rep)
where vec_rep = primRepToRuntimeRep (VecRep n e)
+{-
+Note [Constant-folding during unarisation]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+See #25650.
+
+Goal: ensure that top-level bindings whose unboxed-sum fields are literals
+become statically allocated closures (i.e. compile-time constants in the
+object file) rather than CAFs.
+
+Background: A top-level RHS is statically allocated when it is a plain
+`StgRhsCon`: a data constructor applied to arguments with no surrounding
+expression. Any `StgCase` wrapper, even one that is a no-op at runtime, turns
+the RHS into a CAF.
+
+The problem: When `mkUbxSum` builds an unboxed sum whose argument PrimRep does
+not match the slot PrimRep, the general `castArg` path emits a runtime conversion
+wrapper:
+
+ case <conversion_primop> arg of x' -> <rhs using x'>
+
+For a *variable* argument this is unavoidable, the value is not known at
+compile time. For a *literal* argument, however, the conversion can be performed
+at compile time, avoiding the `StgCase` wrapper entirely.
+
+Example
+~~~~~~~
+Consider:
+
+ data A = MkA (# Int16# | Int32# #)
+ foo = MkA (# 10#Int16 | #)
+
+By the time this gets to the end of the Simplifier pipeline, this still looks
+like:
+ foo = MkA (# 10#Int16 | #)
+That is: the worker for the data constructor takes an unboxed sum as its
+argument.
+
+The Unarise pass, which works on STG, decides that
+ (# 10#Int16 | #) :: (# Int16# | Int32# #)
+should be represented as an pair of an integer tag (of type `Int8#`) and a payload
+value (of type `Word32#`). But to do that it has to convert `10#Int16` into
+`Word32#`, and that conversion is not a no-op. So without constant-folding we
+get:
+
+ foo =
+ \u []
+ case int16ToWord16# [10#Int16] of cst_sum_gio {
+ __DEFAULT ->
+ case word16ToWord# [cst_sum_gio] of cst_sum_gip {
+ __DEFAULT -> MkA [1# cst_sum_gip];
+ };
+ };
+
+Note that in the output of the unarise pass, the worker `MkA` takes two
+arguments: the tag and the payload of our unboxed sum..
+
+However it's a bit silly to generate a CAF here because with some
+constant-folding we can easily avoid this thunk and generate a static datacon
+instead. That's why the literal clause of `castArg` intercepts `Int16# 10`,
+calls `castLiteralArg` to compute `Word32# 10` at compile time, and returns the
+identity wrapper. The result is:
+
+ foo = MkA! [1#Word8 10#Word32];
+
+
+Note that `castLiteralArg` uses `mkLitNumberWrap`, which matches the
+semantics of GHC's integer-conversion primops (zero/sign extension to the target
+width) — exactly the same transformation the runtime conversion would have
+performed.
+
+-}
+
+-- | Try to convert a numeric literal to a new PrimRep at compile time.
+-- Uses wrapping semantics (same as GHC's integer conversion primops).
+-- Returns Nothing for non-numeric literals or unsupported PrimReps.
+-- See Note [Constant-folding during unarisation].
+castLiteralArg :: Platform -> PrimRep -> Literal -> Maybe Literal
+castLiteralArg platform to_rep (LitNumber _ n)
+ | Just to_ty <- litNumTypeFromPrimRep to_rep
+ = Just (mkLitNumberWrap platform to_ty n)
+castLiteralArg _ _ _ = Nothing
+
+litNumTypeFromPrimRep :: PrimRep -> Maybe LitNumType
+litNumTypeFromPrimRep WordRep = Just LitNumWord
+litNumTypeFromPrimRep Word8Rep = Just LitNumWord8
+litNumTypeFromPrimRep Word16Rep = Just LitNumWord16
+litNumTypeFromPrimRep Word32Rep = Just LitNumWord32
+litNumTypeFromPrimRep Word64Rep = Just LitNumWord64
+litNumTypeFromPrimRep IntRep = Just LitNumInt
+litNumTypeFromPrimRep Int8Rep = Just LitNumInt8
+litNumTypeFromPrimRep Int16Rep = Just LitNumInt16
+litNumTypeFromPrimRep Int32Rep = Just LitNumInt32
+litNumTypeFromPrimRep Int64Rep = Just LitNumInt64
+litNumTypeFromPrimRep _ = Nothing
+
--------------------------------------------------------------------------------
{-
=====================================
libraries/base/src/GHC/Stats.hs
=====================================
@@ -26,6 +26,7 @@
-- proposal
-- #289](https://github.com/haskell/core-libraries-committee/issues/289). These
-- declarations are now instead available from the @ghc-experimental@ package.
+-- @ghc-experimental@ contains additional metrics not added to the API here.
module GHC.Stats
( -- * Runtime statistics
=====================================
libraries/base/src/GHC/Weak.hs
=====================================
@@ -29,3 +29,5 @@ module GHC.Weak
) where
import GHC.Internal.Weak
+import GHC.Internal.Weak.Finalize
+import GHC.Weak.Finalize
=====================================
libraries/base/src/GHC/Weak/Finalize.hs
=====================================
@@ -14,9 +14,14 @@ module GHC.Weak.Finalize
import GHC.Internal.Weak.Finalize
--- These imports can be removed once runFinalizerBatch is removed,
--- as can MagicHash above.
-import GHC.Internal.Base (Int, Array#, IO, State#, RealWorld)
+import GHC.Internal.Base
+import GHC.Internal.Exception
+import GHC.Internal.IORef
+import GHC.Internal.Conc.Sync (labelThreadByteArray#, myThreadId)
+import GHC.Internal.IO (catchException, unsafePerformIO)
+import GHC.Internal.IO.Handle.Types (Handle)
+import GHC.Internal.IO.Handle.Text (hPutStrLn)
+import GHC.Internal.Encoding.UTF8 (utf8EncodeByteArray#)
{-# DEPRECATED runFinalizerBatch
@@ -36,3 +41,13 @@ runFinalizerBatch :: Int
-> Array# (State# RealWorld -> State# RealWorld)
-> IO ()
runFinalizerBatch = GHC.Internal.Weak.Finalize.runFinalizerBatch
+
+-- | An exception handler for 'Handle' finalization that prints the error to
+-- the given 'Handle', but doesn't rethrow it.
+--
+-- @since base-4.18.0.0
+printToHandleFinalizerExceptionHandler :: Handle -> SomeException -> IO ()
+printToHandleFinalizerExceptionHandler hdl se =
+ hPutStrLn hdl msg `catchException` (\(SomeException _) -> return ())
+ where
+ msg = "Exception during weak pointer finalization (ignored): " ++ displayException se ++ "\n"
=====================================
libraries/base/src/GHC/Weak/Finalizehs deleted
=====================================
=====================================
libraries/base/src/System/Mem/Weak.hs
=====================================
@@ -91,6 +91,7 @@ module System.Mem.Weak (
import Prelude
import GHC.Internal.Weak
+import GHC.Weak
-- | A specialised version of 'mkWeak', where the key and the value are
-- the same object:
=====================================
libraries/base/tests/IO/T17912.hs
=====================================
@@ -6,6 +6,7 @@ import Control.Exception
import System.IO
import System.Exit
import System.Process
+import GHC.Conc (threadStatus, ThreadStatus(..), BlockReason(..))
import GHC.IO.Handle.FD
main = do
@@ -22,7 +23,14 @@ main = do
putMVar passed True
else print e
throwIO e
- threadDelay 1000
+ let waitUntilBlocked = do
+ st <- threadStatus opener
+ case st of
+ ThreadBlocked BlockedOnForeignCall -> return ()
+ ThreadFinished -> return ()
+ ThreadDied -> return ()
+ _ -> threadDelay 100 >> waitUntilBlocked
+ waitUntilBlocked
forkIO $ killThread opener
forkIO $ do
threadDelay (10^6)
=====================================
libraries/base/tests/IO/all.T
=====================================
@@ -182,7 +182,7 @@ test('T17414',
compile_and_run, [''])
test('T17510', expect_broken(17510), compile_and_run, [''])
test('bytestringread001', extra_run_opts('test.data'), compile_and_run, [''])
-test('T17912', [only_ways(['threaded1']), when(opsys('mingw32'),expect_broken(1))], compile_and_run, [''])
+test('T17912', [only_ways(['threaded1']), when(opsys('mingw32'),expect_broken(17912))], compile_and_run, [''])
test('T18832', only_ways(['threaded1']), compile_and_run, [''])
test('mkdirExists', [exit_code(1), when(opsys('mingw32'), ignore_stderr)], compile_and_run, [''])
=====================================
libraries/ghc-internal/CHANGELOG.md
=====================================
@@ -3,6 +3,7 @@
## 9.1401.0 -- yyyy-mm-dd
* Introduce `dataToCodeQ` and `liftDataTyped`, typed variants of `dataToExpQ` and `liftData` respectively.
+* Add new `gc_sync_elapsed_ns` counter to GHC.Internal.Stats
## 9.1001.0 -- 2024-05-01
=====================================
libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs-boot deleted
=====================================
@@ -1,70 +0,0 @@
-{-# LANGUAGE MagicHash, NoImplicitPrelude #-}
-{-# OPTIONS_HADDOCK not-home #-}
-
------------------------------------------------------------------------------
--- |
--- Module : GHC.Internal.Conc.Sync [boot]
--- Copyright : (c) The University of Glasgow, 1994-2002
--- License : see libraries/base/LICENSE
---
--- Maintainer : ghc-devs(a)haskell.org
--- Stability : internal
--- Portability : non-portable (GHC extensions)
---
--- Basic concurrency stuff.
---
------------------------------------------------------------------------------
-
-module GHC.Internal.Conc.Sync
- ( forkIO,
- ThreadId(..),
- myThreadId,
- showThreadId,
- ThreadStatus(..),
- threadStatus,
- sharedCAF,
- labelThreadByteArray#
- ) where
-
-import GHC.Internal.Base
-import GHC.Internal.Ptr
-
-forkIO :: IO () -> IO ThreadId
-
-data ThreadId = ThreadId ThreadId#
-
-data BlockReason
- = BlockedOnMVar
- -- ^blocked on 'MVar'
- {- possibly (see 'threadstatus' below):
- | BlockedOnMVarRead
- -- ^blocked on reading an empty 'MVar'
- -}
- | BlockedOnBlackHole
- -- ^blocked on a computation in progress by another thread
- | BlockedOnException
- -- ^blocked in 'throwTo'
- | BlockedOnSTM
- -- ^blocked in 'retry' in an STM transaction
- | BlockedOnForeignCall
- -- ^currently in a foreign call
- | BlockedOnOther
- -- ^blocked on some other resource. Without @-threaded@,
- -- I\/O and 'threadDelay' show up as 'BlockedOnOther', with @-threaded@
- -- they show up as 'BlockedOnMVar'.
-
-data ThreadStatus
- = ThreadRunning
- -- ^the thread is currently runnable or running
- | ThreadFinished
- -- ^the thread has finished
- | ThreadBlocked BlockReason
- -- ^the thread is blocked on some resource
- | ThreadDied
- -- ^the thread received an uncaught exception
-
-myThreadId :: IO ThreadId
-showThreadId :: ThreadId -> String
-threadStatus :: ThreadId -> IO ThreadStatus
-sharedCAF :: a -> (Ptr a -> IO (Ptr a)) -> IO a
-labelThreadByteArray# :: ThreadId -> ByteArray# -> IO ()
=====================================
libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs-boot deleted
=====================================
@@ -1,8 +0,0 @@
-{-# LANGUAGE NoImplicitPrelude #-}
-
-module GHC.Internal.IO.Handle.Text ( hPutStrLn ) where
-
-import GHC.Internal.Base (String, IO)
-import {-# SOURCE #-} GHC.Internal.IO.Handle.Types (Handle)
-
-hPutStrLn :: Handle -> String -> IO ()
=====================================
libraries/ghc-internal/src/GHC/Internal/Stats.hsc
=====================================
@@ -111,6 +111,8 @@ data RTSStats = RTSStats {
, gc_cpu_ns :: RtsTime
-- | Total elapsed time used by the GC
, gc_elapsed_ns :: RtsTime
+ -- | Total elapsed time used during GC synchronization
+ , gc_sync_elapsed_ns :: RtsTime
-- | Total CPU time (at the previous GC)
, cpu_ns :: RtsTime
-- | Total elapsed time (at the previous GC)
@@ -234,6 +236,7 @@ getRTSStats = do
mutator_elapsed_ns <- (# peek RTSStats, mutator_elapsed_ns) p
gc_cpu_ns <- (# peek RTSStats, gc_cpu_ns) p
gc_elapsed_ns <- (# peek RTSStats, gc_elapsed_ns) p
+ gc_sync_elapsed_ns <- (# peek RTSStats, gc_sync_elapsed_ns) p
cpu_ns <- (# peek RTSStats, cpu_ns) p
elapsed_ns <- (# peek RTSStats, elapsed_ns) p
nonmoving_gc_sync_cpu_ns <- (# peek RTSStats, nonmoving_gc_sync_cpu_ns) p
=====================================
libraries/ghc-internal/src/GHC/Internal/TopHandler.hs
=====================================
@@ -50,6 +50,8 @@ import GHC.Internal.IO.Handle
import GHC.Internal.IO.StdHandles
import GHC.Internal.IO.Exception
import GHC.Internal.Weak
+import GHC.Internal.Weak.Finalize
+import GHC.Internal.IO.Handle.Types ()
#if defined(mingw32_HOST_OS)
import GHC.Internal.ConsoleHandler as GHC.ConsoleHandler
=====================================
libraries/ghc-internal/src/GHC/Internal/Weak.hs
=====================================
@@ -24,19 +24,9 @@ module GHC.Internal.Weak (
mkWeak,
deRefWeak,
finalize,
-
- -- * Handling exceptions
- -- | When an exception is thrown by a finalizer called by the
- -- garbage collector, GHC calls a global handler which can be set with
- -- 'setFinalizerExceptionHandler'. Note that any exceptions thrown by
- -- this handler will be ignored.
- setFinalizerExceptionHandler,
- getFinalizerExceptionHandler,
- printToHandleFinalizerExceptionHandler
) where
import GHC.Internal.Base
-import GHC.Internal.Weak.Finalize
{-|
A weak pointer object with a key and a value. The value has type @v@.
=====================================
libraries/ghc-internal/src/GHC/Internal/Weak/Finalize.hs
=====================================
@@ -4,26 +4,17 @@
{-# LANGUAGE Unsafe #-}
module GHC.Internal.Weak.Finalize
- ( -- * Handling exceptions
- -- | When an exception is thrown by a finalizer called by the
- -- garbage collector, GHC calls a global handler which can be set with
- -- 'setFinalizerExceptionHandler'. Note that any exceptions thrown by
- -- this handler will be ignored.
- setFinalizerExceptionHandler
- , getFinalizerExceptionHandler
- , printToHandleFinalizerExceptionHandler
- -- * Internal
+ ( getFinalizerExceptionHandler
+ , setFinalizerExceptionHandler
, runFinalizerBatch
) where
import GHC.Internal.Base
-import GHC.Internal.Exception
-import GHC.Internal.IORef
-import {-# SOURCE #-} GHC.Internal.Conc.Sync (labelThreadByteArray#, myThreadId)
-import GHC.Internal.IO (catchException, unsafePerformIO)
-import {-# SOURCE #-} GHC.Internal.IO.Handle.Types (Handle)
-import {-# SOURCE #-} GHC.Internal.IO.Handle.Text (hPutStrLn)
-import GHC.Internal.Encoding.UTF8 (utf8EncodeByteArray#)
+import GHC.Internal.Conc.Sync ( labelThreadByteArray#, myThreadId )
+import GHC.Internal.Encoding.UTF8 ( utf8EncodeByteArray# )
+import GHC.Internal.Exception ( SomeException(..) )
+import GHC.Internal.IO ( catchException, unsafePerformIO )
+import GHC.Internal.IORef ( IORef, newIORef, readIORef, writeIORef )
data ByteArray = ByteArray ByteArray#
@@ -82,13 +73,3 @@ getFinalizerExceptionHandler = readIORef finalizerExceptionHandler
-- @since base-4.18.0.0
setFinalizerExceptionHandler :: (SomeException -> IO ()) -> IO ()
setFinalizerExceptionHandler = writeIORef finalizerExceptionHandler
-
--- | An exception handler for 'Handle' finalization that prints the error to
--- the given 'Handle', but doesn't rethrow it.
---
--- @since base-4.18.0.0
-printToHandleFinalizerExceptionHandler :: Handle -> SomeException -> IO ()
-printToHandleFinalizerExceptionHandler hdl se =
- hPutStrLn hdl msg `catchException` (\(SomeException _) -> return ())
- where
- msg = "Exception during weak pointer finalization (ignored): " ++ displayException se ++ "\n"
=====================================
libraries/template-haskell/Language/Haskell/TH/Quote.hs
=====================================
@@ -23,7 +23,6 @@ module Language.Haskell.TH.Quote
) where
import GHC.Boot.TH.Monad
-import GHC.Boot.TH.Quote
import Language.Haskell.TH.Syntax (dataToQa, dataToExpQ, dataToPatQ)
=====================================
rts/Stats.c
=====================================
@@ -163,6 +163,7 @@ initStats0(void)
.mutator_elapsed_ns = 0,
.gc_cpu_ns = 0,
.gc_elapsed_ns = 0,
+ .gc_sync_elapsed_ns = 0,
.cpu_ns = 0,
.elapsed_ns = 0,
.nonmoving_gc_cpu_ns = 0,
@@ -288,6 +289,8 @@ stat_endExit(void)
RELEASE_LOCK(&stats_mutex);
}
+// This is only called in the threaded RTS. On non-threaded RTS `gc_sync_start_elapsed`
+// is conditonally set in `stat_startGC`.
void
stat_startGCSync (gc_thread *gct)
{
@@ -433,6 +436,11 @@ stat_startGC (Capability *cap, gc_thread *gct)
}
gct->gc_start_elapsed = getProcessElapsedTime();
+#if !defined(THREADED_RTS)
+ // Non-threaded RTS has no sync phase. Initializing in this way makes the
+ // calculated statistics correctly read zero.
+ gct->gc_sync_start_elapsed = gct->gc_start_elapsed;
+#endif
// Post EVENT_GC_START with the same timestamp as used for stats
// (though converted from Time=StgInt64 to EventTimestamp=StgWord64).
@@ -548,6 +556,7 @@ stat_endGC (Capability *cap, gc_thread *initiating_gct, W_ live, W_ copied, W_ s
}
stats.gc_cpu_ns += stats.gc.cpu_ns;
stats.gc_elapsed_ns += stats.gc.elapsed_ns;
+ stats.gc_sync_elapsed_ns += stats.gc.sync_elapsed_ns;
if (gen == RtsFlags.GcFlags.generations-1) { // major GC?
stats.major_gcs++;
@@ -915,6 +924,8 @@ static void report_summary(const RTSSummaryStats* sum)
statsPrintf(" GC time %7.3fs (%7.3fs elapsed)\n",
TimeToSecondsDbl(stats.gc_cpu_ns),
TimeToSecondsDbl(stats.gc_elapsed_ns));
+ statsPrintf(" GC SYNC time (%7.3fs elapsed)\n",
+ TimeToSecondsDbl(stats.gc_sync_elapsed_ns));
if (RtsFlags.GcFlags.useNonmoving) {
statsPrintf(
" CONC GC time %7.3fs (%7.3fs elapsed)\n",
@@ -1069,6 +1080,7 @@ static void report_machine_readable (const RTSSummaryStats * sum)
TimeToSecondsDbl(stats.mutator_elapsed_ns));
MR_STAT("GC_cpu_seconds", "f", TimeToSecondsDbl(stats.gc_cpu_ns));
MR_STAT("GC_wall_seconds", "f", TimeToSecondsDbl(stats.gc_elapsed_ns));
+ MR_STAT("GC_sync_wall_seconds", "f", TimeToSecondsDbl(stats.gc_sync_elapsed_ns));
// end backward compatibility
=====================================
rts/include/RtsAPI.h
=====================================
@@ -240,6 +240,8 @@ typedef struct _RTSStats {
Time gc_cpu_ns;
// Total elapsed time used by the GC
Time gc_elapsed_ns;
+ // Total elapsed time used during GC synchronization
+ Time gc_sync_elapsed_ns;
// Total CPU time (at the previous GC)
Time cpu_ns;
// Total elapsed time (at the previous GC)
=====================================
testsuite/tests/codeGen/should_compile/Makefile
=====================================
@@ -80,3 +80,6 @@ T17648:
T25166:
'$(TEST_HC)' $(TEST_HC_OPTS) -O2 -dno-typeable-binds -ddump-cmm T25166.hs | awk '/foo_closure/{flag=1}/}]/{flag=0}flag'
+
+T25650:
+ '$(TEST_HC)' $(TEST_HC_OPTS) -O2 -dno-typeable-binds -ddump-cmm T25650.hs | awk '/baz_foo_closure|baz_bar_closure/{flag=1}/}]/{flag=0}flag'
=====================================
testsuite/tests/codeGen/should_compile/T25650.hs
=====================================
@@ -0,0 +1,17 @@
+module T25650 (baz_foo, baz_bar) where
+
+import Data.Word
+
+data A
+ = A1 {-# UNPACK #-} !Word32
+ | A2 {-# UNPACK #-} !B
+
+data B = B1 | B2
+
+foo = A1 10
+bar = A2 B2
+
+data C = C {-# UNPACK #-} !A
+
+baz_foo = C foo
+baz_bar = C bar
=====================================
testsuite/tests/codeGen/should_compile/T25650.stdout
=====================================
@@ -0,0 +1,14 @@
+[section ""data" . T25650.baz_foo_closure" {
+ T25650.baz_foo_closure:
+ const T25650.C_con_info;
+ const 10 :: W32;
+ const 1 :: W8;
+ const 0 :: W8;
+ const 0 :: W16;
+[section ""data" . T25650.baz_bar_closure" {
+ T25650.baz_bar_closure:
+ const T25650.C_con_info;
+ const 2 :: W32;
+ const 2 :: W8;
+ const 0 :: W8;
+ const 0 :: W16;
=====================================
testsuite/tests/codeGen/should_compile/all.T
=====================================
@@ -140,6 +140,7 @@ test('callee-no-local', [
)
test('T25166', [req_cmm], makefile_test, [])
+test('T25650', [req_cmm], makefile_test, [])
# dump Core to ensure that d is defined as: d = D 10## RUBBISH(IntRep)
test('T25177', normal, compile, ['-O2 -dno-typeable-binds -ddump-simpl -dsuppress-all -dsuppress-uniques -v0'])
=====================================
testsuite/tests/interface-stability/ghc-experimental-exports.stdout
=====================================
@@ -6587,6 +6587,7 @@ module GHC.Stats.Experimental where
mutator_elapsed_ns :: RtsTime,
gc_cpu_ns :: RtsTime,
gc_elapsed_ns :: RtsTime,
+ gc_sync_elapsed_ns :: RtsTime,
cpu_ns :: RtsTime,
elapsed_ns :: RtsTime,
nonmoving_gc_sync_cpu_ns :: RtsTime,
=====================================
testsuite/tests/interface-stability/ghc-experimental-exports.stdout-mingw32
=====================================
@@ -6590,6 +6590,7 @@ module GHC.Stats.Experimental where
mutator_elapsed_ns :: RtsTime,
gc_cpu_ns :: RtsTime,
gc_elapsed_ns :: RtsTime,
+ gc_sync_elapsed_ns :: RtsTime,
cpu_ns :: RtsTime,
elapsed_ns :: RtsTime,
nonmoving_gc_sync_cpu_ns :: RtsTime,
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5cba550060ae73e5abfd6ab03c9402…
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11 Mar '26
Apoorv Ingle pushed new branch wip/ani/kill-CodeSrcFlag at Glasgow Haskell Compiler / GHC
--
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[Git][ghc/ghc][wip/ani/kill-SrcCodeOrigin] make Data instance for ErrCtxtMsg, accept test cases
by Apoorv Ingle (＠ani) 11 Mar '26
by Apoorv Ingle (＠ani) 11 Mar '26
11 Mar '26
Apoorv Ingle pushed to branch wip/ani/kill-SrcCodeOrigin at Glasgow Haskell Compiler / GHC
Commits:
dd34f3ec by Apoorv Ingle at 2026-03-11T17:23:53-05:00
make Data instance for ErrCtxtMsg, accept test cases
- - - - -
5 changed files:
- compiler/GHC/Hs/Instances.hs
- testsuite/tests/count-deps/CountDepsAst.stdout
- testsuite/tests/count-deps/CountDepsParser.stdout
- testsuite/tests/monadfail/MonadFailErrors.stderr
- testsuite/tests/parser/should_fail/RecordDotSyntaxFail9.stderr
Changes:
=====================================
compiler/GHC/Hs/Instances.hs
=====================================
@@ -642,7 +642,7 @@ deriving instance Eq (IE GhcTc)
-- TODO: I think we still need instances for StmtCtxt, ExprCtxt and PatCtxt ctors of ErrCtxtMsg
instance Data ErrCtxtMsg where
gunfold _ _ _ = error "no gunfold for ErrCtxtMsg"
- gfoldl _ _ _ = error "no gfoldl for ErrCtxtMsg"
+ gfoldl _ k z = k z
toConstr = error "no toConstr for ErrCtxtMsg"
dataTypeOf = error "no dataTypeOf for ErrCtxtMsg"
=====================================
testsuite/tests/count-deps/CountDepsAst.stdout
=====================================
@@ -143,7 +143,6 @@ GHC.Tc.Types.Rank
GHC.Tc.Types.TH
GHC.Tc.Types.TcRef
GHC.Tc.Utils.TcType
-GHC.Tc.Zonk.Monad
GHC.Types.Annotations
GHC.Types.Arity
GHC.Types.Avail
=====================================
testsuite/tests/count-deps/CountDepsParser.stdout
=====================================
@@ -164,7 +164,6 @@ GHC.Tc.Types.Rank
GHC.Tc.Types.TH
GHC.Tc.Types.TcRef
GHC.Tc.Utils.TcType
-GHC.Tc.Zonk.Monad
GHC.Types.Annotations
GHC.Types.Arity
GHC.Types.Avail
=====================================
testsuite/tests/monadfail/MonadFailErrors.stderr
=====================================
@@ -1,4 +1,3 @@
-
MonadFailErrors.hs:14:5: error: [GHC-39999]
• Could not deduce ‘MonadFail m’
arising from a do statement
@@ -15,10 +14,6 @@ MonadFailErrors.hs:14:5: error: [GHC-39999]
In the expression:
do Just x <- undefined
undefined
- In an equation for ‘general’:
- general
- = do Just x <- undefined
- undefined
MonadFailErrors.hs:28:5: error: [GHC-39999]
• No instance for ‘MonadFail Identity’
@@ -28,10 +23,6 @@ MonadFailErrors.hs:28:5: error: [GHC-39999]
In the expression:
do Just x <- undefined
undefined
- In an equation for ‘identity’:
- identity
- = do Just x <- undefined
- undefined
MonadFailErrors.hs:42:5: error: [GHC-39999]
• No instance for ‘MonadFail ((->) r)’
@@ -41,7 +32,4 @@ MonadFailErrors.hs:42:5: error: [GHC-39999]
In the expression:
do Just x <- undefined
undefined
- In an equation for ‘reader’:
- reader
- = do Just x <- undefined
- undefined
+
=====================================
testsuite/tests/parser/should_fail/RecordDotSyntaxFail9.stderr
=====================================
@@ -1,7 +1,7 @@
-
RecordDotSyntaxFail9.hs:7:11: error: [GHC-18872]
• Couldn't match type ‘Int’ with ‘[Char]’
arising from selecting the field ‘foo’
- • In the expression: a.foo :: String
+ • In the expression: a.foo
In a pattern binding: _ = a.foo :: String
In a stmt of a 'do' block: let _ = a.foo :: String
+
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/dd34f3ec3d1149030566260c30b0a11…
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[Git][ghc/ghc][wip/stack-cloning-segfault] 24 commits: chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad
by Matthew Pickering (＠mpickering) 11 Mar '26
by Matthew Pickering (＠mpickering) 11 Mar '26
11 Mar '26
Matthew Pickering pushed to branch wip/stack-cloning-segfault at Glasgow Haskell Compiler / GHC
Commits:
23a50772 by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00
chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad
Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to
GHC.Internal.TH.Monad and delete the Quote module.
Update submodule template-haskell-quasiquoter to use the merged
upstream version that imports from the correct module.
Co-authored-by: Cursor <cursoragent(a)cursor.com>
- - - - -
a2bb6fc3 by Simon Jakobi at 2026-03-10T14:12:23-04:00
Add regression test for #16122
- - - - -
604e1180 by Cheng Shao at 2026-03-11T15:00:42-04:00
hadrian: remove the broken bench flavour
This patch removes the bench flavour from hadrian which has been
broken for years and not used for actual benchmarking (for which
`perf`/`release` is used instead). Closes #26825.
- - - - -
c3e64915 by Simon Jakobi at 2026-03-11T15:01:31-04:00
Add regression test for #18186
The original TypeInType language extension is replaced with
DataKinds+PolyKinds for compatibility.
Closes #18186.
- - - - -
664996c7 by Andreas Klebinger at 2026-03-11T15:02:16-04:00
Bump nofib submodule.
We accrued a number of nofib fixes we want to have here.
- - - - -
517cf64e by Simon Jakobi at 2026-03-11T15:03:03-04:00
Add regression test for #15907
Closes #15907.
- - - - -
fff362cf by Simon Jakobi at 2026-03-11T15:03:49-04:00
Ensure T14272 is run in optasm way
Closes #16539.
- - - - -
ec81ec2c by Simon Jakobi at 2026-03-11T15:03:49-04:00
Add regression test for #24632
Closes #24632.
- - - - -
cefec47b by Simon Jakobi at 2026-03-11T15:03:50-04:00
Fix module name of T9675: T6975 -> T9675
- - - - -
d3690ae8 by Andreas Klebinger at 2026-03-11T15:04:31-04:00
User guide: Clarify phase control on INLINEABLE[foo] pragmas.
Fixes #26851
- - - - -
e7054934 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12694
Closes #12694.
- - - - -
4756d9f6 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #16275
Closes #16275.
- - - - -
34b7e2c1 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14908
Closes #14908.
- - - - -
4243db3d by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14151
Closes #14151.
- - - - -
0e9f1453 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12640
Closes #12640.
- - - - -
ae606c7f by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #15588
Closes #15588.
- - - - -
5a38ce4e by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #9445
Closes #9445.
- - - - -
d054b467 by Cheng Shao at 2026-03-11T15:05:59-04:00
compiler: implement string interning logic for BCONPtrFS
This patch adds a `FastStringEnv`-based cache of `MallocStrings`
requests to `Interp`, so that when we load bytecode with many
breakpoints that share the same module names & unit ids, we reuse the
allocated remote pointers instead of issuing duplicte `MallocStrings`
requests and bloating the C heap. Closes #26995.
- - - - -
b85a0293 by Simon Jakobi at 2026-03-11T15:06:41-04:00
Add perf test for #1216
Closes #1216.
- - - - -
cd7f7420 by Sylvain Henry at 2026-03-11T15:07:58-04:00
JS: check that tuple constructors are linked (#23709)
Test js-mk_tup was failing before because tuple constructors weren't
linked in. It's no longer an issue after the linker fixes.
- - - - -
d57f01a4 by Matthew Pickering at 2026-03-11T15:08:40-04:00
testsuite: Add test for foreign import prim with unboxed tuple return
This commit just adds a test that foreign import prim works with unboxed
sums.
- - - - -
23d111ce by Matthew Pickering at 2026-03-11T15:08:41-04:00
Return a valid pointer in advanceStackFrameLocationzh
When there is no next stack chunk, `advanceStackFrameLocationzh` used to
return NULL in the pointer-typed StackSnapshot# result slot.
Even though the caller treats that case as "no next frame", the result is
still materialized in a GC-visible pointer slot. If a GC observes the raw
NULL there, stack decoding can crash.
Fix this by ensuring the dead pointer slot contains a valid closure
pointer. Also make the optional result explicit by returning an unboxed
sum instead of a tuple with a separate tag.
Fixes #27009
- - - - -
4c58a3ae by Cheng Shao at 2026-03-11T15:09:22-04:00
hadrian: build profiled dynamic objects with -dynamic-too
This patch enables hadrian to build profiled dynamic objects with
`-dynamic-too`, addressing a build parallelism bottleneck in release
pipelines. Closes #27010.
- - - - -
59801927 by Matthew Pickering at 2026-03-11T21:40:55+00:00
rts: forward clone-stack messages after TSO migration
MSG_CLONE_STACK assumed that the target TSO was still owned by the
capability that received the message. This is not always true: the TSO
can migrate before the inbox entry is handled.
When that happened, handleCloneStackMessage could clone a live stack from
the wrong capability and use the wrong capability for allocation and
performTryPutMVar, leading to stack sanity failures such as
checkStackFrame: weird activation record found on stack.
Fix this by passing the current capability into
handleCloneStackMessage, rechecking msg->tso->cap at handling time, and
forwarding the message if the TSO has migrated. Once ownership matches,
use the executing capability consistently for cloneStack, rts_apply, and
performTryPutMVar.
Fixes #27008
- - - - -
70 changed files:
- compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/ByteCode/Linker.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- docs/users_guide/exts/pragmas.rst
- docs/users_guide/exts/rewrite_rules.rst
- hadrian/doc/flavours.md
- hadrian/hadrian.cabal
- hadrian/src/Rules/Compile.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Ghc.hs
- − hadrian/src/Settings/Flavours/Benchmark.hs
- libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
- libraries/ghc-internal/cbits/Stack.cmm
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
- − libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
- libraries/template-haskell-quasiquoter
- nofib
- rts/CloneStack.c
- rts/CloneStack.h
- rts/Messages.c
- + testsuite/tests/corelint/T15907.hs
- + testsuite/tests/corelint/T15907A.hs
- testsuite/tests/corelint/all.T
- + testsuite/tests/dependent/should_fail/T15588.hs
- + testsuite/tests/dependent/should_fail/T15588.stderr
- testsuite/tests/dependent/should_fail/all.T
- + testsuite/tests/ffi/should_run/PrimFFIUnboxedSum.hs
- + testsuite/tests/ffi/should_run/PrimFFIUnboxedSum.stdout
- + testsuite/tests/ffi/should_run/PrimFFIUnboxedSum_cmm.cmm
- testsuite/tests/ffi/should_run/all.T
- + testsuite/tests/ghci/scripts/T24632.hs
- + testsuite/tests/ghci/scripts/T24632.script
- + testsuite/tests/ghci/scripts/T24632.stdout
- testsuite/tests/ghci/scripts/all.T
- testsuite/tests/javascript/js-mk_tup.hs
- testsuite/tests/javascript/js-mk_tup.stdout
- testsuite/tests/linters/Makefile
- testsuite/tests/perf/compiler/T9675.hs
- + testsuite/tests/perf/should_run/T1216.hs
- + testsuite/tests/perf/should_run/T1216.stdout
- testsuite/tests/perf/should_run/all.T
- testsuite/tests/plugins/plugins10.stdout
- + testsuite/tests/polykinds/T18186.hs
- + testsuite/tests/polykinds/T18186.stderr
- testsuite/tests/polykinds/all.T
- testsuite/tests/quotes/QQError.stderr
- testsuite/tests/rts/all.T
- + testsuite/tests/rts/cloneThreadStackMigrating.hs
- + testsuite/tests/simplCore/should_compile/T12640.hs
- + testsuite/tests/simplCore/should_compile/T12640.stderr
- + testsuite/tests/simplCore/should_compile/T14908.hs
- + testsuite/tests/simplCore/should_compile/T14908_Deps.hs
- + testsuite/tests/simplCore/should_compile/T16122.hs
- + testsuite/tests/simplCore/should_compile/T16122.stderr
- + testsuite/tests/simplCore/should_compile/T9445.hs
- testsuite/tests/simplCore/should_compile/all.T
- testsuite/tests/th/QQTopError.stderr
- + testsuite/tests/typecheck/should_compile/T14151.hs
- testsuite/tests/typecheck/should_compile/all.T
- + testsuite/tests/typecheck/should_fail/T12694.hs
- + testsuite/tests/typecheck/should_fail/T12694.stderr
- + testsuite/tests/typecheck/should_fail/T16275.stderr
- + testsuite/tests/typecheck/should_fail/T16275A.hs
- + testsuite/tests/typecheck/should_fail/T16275B.hs
- + testsuite/tests/typecheck/should_fail/T16275B.hs-boot
- testsuite/tests/typecheck/should_fail/all.T
The diff was not included because it is too large.
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