[Git][ghc/ghc][wip/romes/27401-2] 3 commits: TTG: Add extension points to HsConDetails
by Rodrigo Mesquita (＠alt-romes) 18 Jun '26
by Rodrigo Mesquita (＠alt-romes) 18 Jun '26
18 Jun '26
Rodrigo Mesquita pushed to branch wip/romes/27401-2 at Glasgow Haskell Compiler / GHC
Commits:
4efb4a66 by Alan Zimmerman at 2026-06-18T14:41:14-04:00
TTG: Add extension points to HsConDetails
Extend HsConDetails as
data HsConDetails p arg rec
= PrefixCon !(XPrefixCon p) [arg] -- C @t1 @t2 p1 p2 p3
| RecCon !(XRecCon p) rec -- C { x = p1, y = p2 }
| InfixCon !(XInfixCon p) arg arg -- p1 `C` p2
| XHsConDetails !(XXHsConDetails p)
type family XPrefixCon p
type family XRecCon p
type family XInfixCon p
type family XXHsConDetails p
- - - - -
c8d27dd4 by Simon Jakobi at 2026-06-18T14:41:59-04:00
CI: quiet submodule clean output in after_script and setup
The clean and cleanup_submodules functions ran 'git submodule foreach
git clean -xdf', flooding the job log with 'Entering ...' and
'Removing ...' lines. Pass --quiet to 'git submodule' and -q to 'git
clean' to drop the success output; errors are still reported.
Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com>
- - - - -
90fbaf5c by Rodrigo Mesquita at 2026-06-18T19:56:21+01:00
perf: Share Module in Iface Symbol Table
This commit modifies the structure of the serialized `SymbolTable Name`
to then re-use and share the `Module` (both on disk and in memory) across
all `Name`s from the same module.
The new structure looks like:
<total name count>
$modules.size
for (mod, names) in $modules:
$mod
$names.size
for table_ix, occ in $names
$table_ix
$occ
i.e. we put the module just once, followed by all names in that module.
When deserializing, we deserialize the module just once, and all the
following `Name`s are constructed with a pointer to that same decoded
`Module`.
Fixes #27401
- - - - -
53 changed files:
- .gitlab/ci.sh
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Constructor.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Unit/Module/Env.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Type.hs
- testsuite/tests/ghc-api/exactprint/Test20239.stderr
- testsuite/tests/haddock/should_compile_flag_haddock/T24221.stderr
- testsuite/tests/parser/should_compile/DumpParsedAst.stderr
- testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
- testsuite/tests/parser/should_compile/T14189.stderr
- testsuite/tests/parser/should_compile/T20452.stderr
- testsuite/tests/printer/Test24533.stdout
- utils/check-exact/ExactPrint.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
- utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
- utils/haddock/haddock-api/src/Haddock/Convert.hs
- utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
- utils/haddock/haddock-api/src/Haddock/Interface/LexParseRn.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
- utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
- utils/haddock/haddock-api/src/Haddock/Types.hs
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[Git][ghc/ghc][master] CI: quiet submodule clean output in after_script and setup
by Marge Bot (＠marge-bot) 18 Jun '26
by Marge Bot (＠marge-bot) 18 Jun '26
18 Jun '26
Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC
Commits:
c8d27dd4 by Simon Jakobi at 2026-06-18T14:41:59-04:00
CI: quiet submodule clean output in after_script and setup
The clean and cleanup_submodules functions ran 'git submodule foreach
git clean -xdf', flooding the job log with 'Entering ...' and
'Removing ...' lines. Pass --quiet to 'git submodule' and -q to 'git
clean' to drop the success output; errors are still reported.
Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com>
- - - - -
1 changed file:
- .gitlab/ci.sh
Changes:
=====================================
.gitlab/ci.sh
=====================================
@@ -441,7 +441,7 @@ function cleanup_submodules() {
# is not valid. Avoid failing in this case with the following insanity.
git submodule sync || git submodule deinit --force --all
git submodule update --init
- git submodule foreach git clean -xdf
+ git submodule --quiet foreach git clean -xdfq
else
info "Not cleaning submodules, not in a git repo"
fi;
@@ -934,8 +934,8 @@ function clean() {
# uploaded. Keep in sync with `jobArtifacts` in
# `.gitlab/generate-ci/gen_ci.hs`!
if [[ "${CI_DISPOSABLE_ENVIRONMENT:-}" != true ]]; then
- git submodule foreach --recursive git clean -xdf
- git clean -xdf \
+ git submodule --quiet foreach --recursive git clean -xdfq
+ git clean -xdfq \
--exclude=ci_timings.txt \
--exclude=ghc-*.tar.xz \
--exclude=junit.xml \
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c8d27dd428e961a16fde9b2940c9e4a…
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[Git][ghc/ghc][master] TTG: Add extension points to HsConDetails
by Marge Bot (＠marge-bot) 18 Jun '26
by Marge Bot (＠marge-bot) 18 Jun '26
18 Jun '26
Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC
Commits:
4efb4a66 by Alan Zimmerman at 2026-06-18T14:41:14-04:00
TTG: Add extension points to HsConDetails
Extend HsConDetails as
data HsConDetails p arg rec
= PrefixCon !(XPrefixCon p) [arg] -- C @t1 @t2 p1 p2 p3
| RecCon !(XRecCon p) rec -- C { x = p1, y = p2 }
| InfixCon !(XInfixCon p) arg arg -- p1 `C` p2
| XHsConDetails !(XXHsConDetails p)
type family XPrefixCon p
type family XRecCon p
type family XInfixCon p
type family XXHsConDetails p
- - - - -
49 changed files:
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Constructor.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Type.hs
- testsuite/tests/ghc-api/exactprint/Test20239.stderr
- testsuite/tests/haddock/should_compile_flag_haddock/T24221.stderr
- testsuite/tests/parser/should_compile/DumpParsedAst.stderr
- testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
- testsuite/tests/parser/should_compile/T14189.stderr
- testsuite/tests/parser/should_compile/T20452.stderr
- testsuite/tests/printer/Test24533.stdout
- utils/check-exact/ExactPrint.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
- utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
- utils/haddock/haddock-api/src/Haddock/Convert.hs
- utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
- utils/haddock/haddock-api/src/Haddock/Interface/LexParseRn.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
- utils/haddock/haddock-api/src/Haddock/Types.hs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/4efb4a66de6bc32feafdc85383488a5…
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[Git][ghc/ghc][wip/sg/first-class-strict] 2 commits: Strict: STG representation and code generation
by Sebastian Graf (＠sgraf812) 18 Jun '26
by Sebastian Graf (＠sgraf812) 18 Jun '26
18 Jun '26
Sebastian Graf pushed to branch wip/sg/first-class-strict at Glasgow Haskell Compiler / GHC
Commits:
1485c1ae by I-Al-Istannen at 2026-06-18T20:37:14+02:00
Strict: STG representation and code generation
Treats Strict a as a single unlifted heap pointer through RepType,
unarisation, STG lint, tag inference and StgToCmm: an unlifted box is already
evaluated and properly tagged, so it is returned directly unless applied as a
function. An STG Lint check flags an evaluated binder lowered to an updatable
indirection.
Co-authored-by: Sebastian Graf <sgraf1337(a)gmail.com>
- - - - -
1ca509da by Sebastian Graf at 2026-06-18T20:37:14+02:00
Strict: add a should_run test for the strict-field machinery
StrictBox exercises a strict value field built from a thunk (forced to an
evaluated, properly-tagged value), a strict field of function type that is
applied, worker/wrapper unboxing of a strict argument, and a strict field
holding another boxed value. Run with -dtag-inference-checks so that a strict
field that is not properly tagged aborts at runtime.
- - - - -
15 changed files:
- compiler/GHC/Builtin/PrimOps/Casts.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToCmm/Closure.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/TagCheck.hs
- compiler/GHC/Types/RepType.hs
- + testsuite/tests/codeGen/should_run/StrictBox.hs
- + testsuite/tests/codeGen/should_run/StrictBox.stdout
- testsuite/tests/codeGen/should_run/all.T
- testsuite/tests/core-to-stg/T24124.stderr
- testsuite/tests/ghci.debugger/scripts/T13825-debugger.stdout
- testsuite/tests/ghci.debugger/scripts/print007.stdout
- testsuite/tests/ghci.debugger/scripts/print022.stdout
- testsuite/tests/simplStg/should_compile/T15226b.stderr
Changes:
=====================================
compiler/GHC/Builtin/PrimOps/Casts.hs
=====================================
@@ -53,6 +53,10 @@ getCasts from_rep to_rep
| -- pprTrace "getCasts" (ppr (from_rep,to_rep)) $
to_rep == from_rep
= []
+ | from_rep == BoxedRep (Just Lifted) && to_rep == BoxedRep (Just Unlifted)
+ = []
+ | to_rep == BoxedRep (Just Lifted) && from_rep == BoxedRep (Just Unlifted)
+ = []
-- Float <-> Double
| to_rep == FloatRep =
=====================================
compiler/GHC/Stg/Lint.hs
=====================================
@@ -101,7 +101,7 @@ import GHC.Stg.Syntax
import GHC.Stg.Utils
import GHC.Core.DataCon
-import GHC.Core ( AltCon(..) )
+import GHC.Core ( AltCon(..), isEvaldUnfolding )
import GHC.Core.Type
import GHC.Core.Lint ( lintMessage )
@@ -126,6 +126,7 @@ import Control.Monad
import GHC.Core.Multiplicity (scaledThing)
import GHC.Settings (Platform)
import GHC.Core.TyCon (primRepCompatible, primRepsCompatible)
+import GHC.Builtin.Types (isStrictTy)
lintStgTopBindings :: forall a . (OutputablePass a, BinderP a ~ Id)
=> Platform
@@ -230,8 +231,23 @@ lint_binds_help top_lvl (binder, rhs)
-- Check binder doesn't have unlifted type or it's a join point
checkL ( isJoinId binder
|| not (isUnliftedType (idType binder))
+ || isNiceStrict -- Allow Strict bindings for now. They should be in HNF.
|| isDataConWorkId binder || isDataConWrapId binder) -- until #17521 is fixed
(mkUnliftedTyMsg opts binder rhs)
+ -- See Note [The Strict type] in GHC.Builtin.Types: a binder known to be
+ -- evaluated (an evald unfolding) must not be lowered to an updatable
+ -- indirection, which would turn an EPT value into a non-EPT thunk. An
+ -- evaluated indirection should have been shortened away instead.
+ when (not (isTopLevel top_lvl)) $
+ checkL (not (isEvaldUnfolding (idUnfolding binder)) || not (isUpdatableIndirection rhs))
+ (mkEvaldUpdatableMsg opts binder rhs)
+ where
+ isNiceStrict = isStrictTy (idType binder) && not (isRhsUpdatable rhs)
+ isRhsUpdatable (StgRhsClosure _ _ flag _ _ _) = isUpdatable flag
+ isRhsUpdatable (StgRhsCon {}) = False
+ -- An updatable thunk whose body is just a reference to another variable.
+ isUpdatableIndirection (StgRhsClosure _ _ flag [] (StgApp _ []) _) = isUpdatable flag
+ isUpdatableIndirection _ = False
-- | Top-level bindings can't inherit the cost centre stack from their
-- (static) allocation site.
@@ -566,3 +582,10 @@ mkUnliftedTyMsg opts binder rhs
text "has unlifted type" <+> quotes (ppr (idType binder)))
$$
(text "RHS:" <+> pprStgRhs opts rhs)
+
+mkEvaldUpdatableMsg :: OutputablePass a => StgPprOpts -> Id -> GenStgRhs a -> SDoc
+mkEvaldUpdatableMsg opts binder rhs
+ = (text "Let binder" <+> quotes (ppr binder) <+>
+ text "has an evaluated unfolding but an updatable indirection RHS")
+ $$
+ (text "RHS:" <+> pprStgRhs opts rhs)
=====================================
compiler/GHC/Stg/Unarise.hs
=====================================
@@ -416,7 +416,6 @@ import GHC.Builtin.PrimOps.Casts
import GHC.Platform
import Data.List (mapAccumL)
--- import GHC.Utils.Trace
--------------------------------------------------------------------------------
-- | A mapping from binders to the Ids they were expanded/renamed to.
@@ -843,7 +842,7 @@ mapSumIdBinders alt_bndr args rhs rho0
arg_slots = map primRepSlot $ concatMap stgArgRep args
-- The slots representing the field of the sum we bind.
id_slots = map primRepSlot $ fld_reps
- layout1 = layoutUbxSum arg_slots id_slots
+ layout1 = layoutUbxSum arg_slots (map (\s -> (s, True)) id_slots)
-- See Note [Casting slot arguments]
-- Most of the code here is just to make sure our binders are of the
@@ -927,7 +926,7 @@ mkUbxSum platform dc ty_args args0 us
= let
tag_slot :| sum_slots = ubxSumRepType ty_args
-- drop tag slot
- field_slots = (mapMaybe (repSlotTy . stgArgRep) args0)
+ field_slots = mapMaybe argToSlotTy args0
tag = dataConTag dc
layout' = layoutUbxSum sum_slots field_slots
@@ -970,6 +969,10 @@ mkUbxSum platform dc ty_args args0 us
, Just lit' <- castLiteralArg platform (slotPrimRep slot_ty) lit
= Just (StgLitArg lit', us, id)
castArg us slot_ty arg
+ -- A lifted pointer stored in an unlifted slot needs no conversion; both
+ -- are heap pointers.
+ | slot_ty == PtrUnliftedSlot && stgArgRepU arg == BoxedRep (Just Lifted)
+ = Nothing
-- Cast the argument to the type of the slot if required
| slotPrimRep slot_ty /= stgArgRepU arg
, (ops,types) <- unzip $ getCasts (stgArgRepU arg) $ slotPrimRep slot_ty
@@ -985,12 +988,17 @@ mkUbxSum platform dc ty_args args0 us
tup_args = tag_arg : slot_args
in
- -- pprTrace "mkUbxSum" (
- -- text "ty_args (slots)" <+> ppr ty_args $$
- -- text "args0" <+> ppr args0 $$
- -- text "wrapper" <+>
- -- (ppr $ wrapper $ StgLit $ LitChar '_'))
(tup_args, wrapper)
+ where
+ -- The Bool says whether a lifted pointer may occupy an unlifted slot; we
+ -- conservatively allow it for any pointer. Pointer slots are handled
+ -- loosely: this is sound only because 'fitsIn' keeps the lifted and unlifted
+ -- pointer slots separate, so an unlifted argument falls back to a lifted slot
+ -- (see 'layoutUbxSum') rather than the two being merged.
+ argToSlotTy :: StgArg -> Maybe (SlotTy, Bool)
+ argToSlotTy arg = do
+ ty <- repSlotTy (stgArgRep arg)
+ return (ty, True)
-- | Return a rubbish value for the given slot type.
=====================================
compiler/GHC/StgToCmm/Closure.hs
=====================================
@@ -95,6 +95,7 @@ import Data.Coerce (coerce)
import qualified Data.ByteString.Char8 as BS8
import GHC.StgToCmm.Config
import GHC.Stg.EnforceEpt.TagSig (isTaggedSig)
+import GHC.Builtin.Types (isStrictTy)
-----------------------------------------------------------------------------
-- Data types and synonyms
@@ -199,9 +200,9 @@ addArgReps = map (\arg -> let arg' = fromNonVoid arg
mkLFArgument :: Id -> LambdaFormInfo
mkLFArgument id
- | isUnliftedType ty = LFUnlifted
- | mightBeFunTy ty = LFUnknown True
- | otherwise = LFUnknown False
+ | isUnliftedType ty = LFUnlifted
+ | mightBeFunTy ty = LFUnknown True
+ | otherwise = LFUnknown False
where
ty = idType id
@@ -224,7 +225,10 @@ mkLFReEntrant top fvs args arg_descr
-------------
mkLFThunk :: Type -> TopLevelFlag -> [Id] -> UpdateFlag -> LambdaFormInfo
mkLFThunk thunk_ty top fvs upd_flag
- = assert (not (isUpdatable upd_flag) || not (isUnliftedType thunk_ty)) $
+ | isUpdatable upd_flag && isUnliftedType thunk_ty && not (isStrictTy thunk_ty)
+ = pprPanic "mkLFThunk" (ppr thunk_ty <+> ppr top <+> ppr fvs <+> ppr upd_flag)
+mkLFThunk thunk_ty top fvs upd_flag
+ = assert (not (isUpdatable upd_flag) || not (isUnliftedType thunk_ty) || (isStrictTy thunk_ty)) $
LFThunk top (null fvs)
(isUpdatable upd_flag)
NonStandardThunk
@@ -542,8 +546,12 @@ getCallMethod cfg name id (LFReEntrant _ arity _ _) n_args _cg_loc _self_loop_in
| n_args < arity = SlowCall -- Not enough args
| otherwise = DirectEntry (enterIdLabel (stgToCmmPlatform cfg) name (idCafInfo id)) arity
-getCallMethod _ _name _ LFUnlifted n_args _cg_loc _self_loop_info
- = assert (n_args == 0) ReturnIt
+getCallMethod cfg name id LFUnlifted n_args cg_loc self_loop_info
+ -- A value of unlifted type is already evaluated, so we can just return it,
+ -- unless it is also a function (e.g. @Strict (a -> b)@) that is being
+ -- applied, in which case we must call it.
+ | n_args > 0 = getCallMethod cfg name id (LFUnknown True) n_args cg_loc self_loop_info
+ | otherwise = ReturnIt
getCallMethod _ _name _ (LFCon _) n_args _cg_loc _self_loop_info
= assert (n_args == 0) ReturnIt
@@ -552,7 +560,6 @@ getCallMethod _ _name _ (LFCon _) n_args _cg_loc _self_loop_info
getCallMethod cfg name id (LFThunk _ _ updatable std_form_info is_fun)
n_args _cg_loc _self_loop_info
-
| Just sig <- idTagSig_maybe id
, isTaggedSig sig -- Infered to be already evaluated by EPT analysis
, n_args == 0 -- See Note [EPT enforcement]
=====================================
compiler/GHC/StgToCmm/Expr.hs
=====================================
@@ -41,9 +41,10 @@ import GHC.Core
import GHC.Core.DataCon
import GHC.Types.ForeignCall
import GHC.Types.Id
+import GHC.Types.Unique ( hasKey )
import GHC.Builtin.PrimOps
import GHC.Core.TyCon
-import GHC.Core.Type ( isUnliftedType )
+import GHC.Core.Type ( isUnliftedType, splitTyConApp_maybe )
import GHC.Types.RepType ( isZeroBitTy, countConRepArgs, mightBeFunTy )
import GHC.Types.CostCentre ( CostCentreStack, currentCCS )
import GHC.Types.Tickish
@@ -58,6 +59,8 @@ import Control.Arrow ( first )
import Data.List ( partition )
import GHC.Stg.EnforceEpt.TagSig (isTaggedSig)
import GHC.Platform.Profile (profileIsProfiling)
+import GHC.Builtin.Names (strictTyConKey, strictDataConKey)
+import GHC.Plugins (varUnique)
------------------------------------------------------------------------
-- cgExpr: the main function
@@ -1037,6 +1040,10 @@ cgConApp con mn stg_args
; emitReturn [idInfoToAmode idinfo] }
cgIdApp :: Id -> [StgArg] -> FCode ReturnKind
+cgIdApp fun_id _
+ -- MkStrict is erased in CorePrep, so it must never reach the code generator.
+ | varUnique fun_id == strictDataConKey
+ = pprPanic "cgIdApp: MkStrict survived to StgToCmm" (ppr fun_id)
cgIdApp fun_id args = do
platform <- getPlatform
fun_info <- getCgIdInfo fun_id
@@ -1051,15 +1058,32 @@ cgIdApp fun_id args = do
case getCallMethod cfg fun_name fun_id lf_info n_args (cg_loc fun_info) self_loop of
-- A value in WHNF, so we can just return it.
ReturnIt
- | isZeroBitTy (idType fun_id) -> emitReturn []
- | otherwise -> emitReturn [fun]
+ | isZeroBitTy (idType fun_id) -> do
+ emitReturn []
+ | otherwise -> do
+ if strict then
+ assertTag >> emitReturn [fun]
+ else
+ emitReturn [fun]
+ where
+ tcSplitMaybe = splitTyConApp_maybe (idType fun_id)
+ strict = case tcSplitMaybe of
+ Nothing -> False
+ Just (tc, _) -> tc `hasKey` strictTyConKey
+ assertTag = whenCheckTags $ do
+ mod <- getModuleName
+ emitTagAssertionStrict (showPprUnsafe
+ (text "TagCheck failed on entry in" <+> ppr mod <+> text "- value:" <> ppr fun_id <+> pdoc platform fun))
+ fun
-- A value infered to be in WHNF, so we can just return it.
-- See (EPT-codegen) in Note [EPT enforcement] in GHC.Stg.EnforceEpt
InferedReturnIt
- | isZeroBitTy (idType fun_id) -> trace >> emitReturn []
- | otherwise -> trace >> assertTag >>
- emitReturn [fun]
+ | isZeroBitTy (idType fun_id) -> do
+ trace >> emitReturn []
+ | otherwise -> do
+ trace >> assertTag >>
+ emitReturn [fun]
where
trace = do
tickyTagged
@@ -1074,12 +1098,11 @@ cgIdApp fun_id args = do
(text "TagCheck failed on entry in" <+> ppr mod <+> text "- value:" <> ppr fun_id <+> pdoc platform fun))
fun
- EnterIt -> assertPpr (null args) (ppr fun_id $$ ppr args) $ -- Discarding arguments
+ EnterIt -> assertPpr (null args) (ppr fun_id $$ ppr args) $ do -- Discarding arguments
emitEnter fun
SlowCall -> do -- A slow function call via the RTS apply routines
{ tickySlowCall lf_info args
- ; emitComment $ mkFastString "slowCall"
; slowCall fun args }
-- A direct function call (possibly with some left-over arguments)
=====================================
compiler/GHC/StgToCmm/TagCheck.hs
=====================================
@@ -10,7 +10,8 @@
module GHC.StgToCmm.TagCheck
( emitTagAssertion, emitArgTagCheck, checkArg, whenCheckTags,
- checkArgStatic, checkFunctionArgTags,checkConArgsStatic,checkConArgsDyn) where
+ checkArgStatic, checkFunctionArgTags,checkConArgsStatic,checkConArgsDyn
+ , emitTagAssertionStrict) where
#include "ClosureTypes.h"
@@ -71,6 +72,51 @@ whenCheckTags act = do
check_tags <- stgToCmmDoTagCheck <$> getStgToCmmConfig
when check_tags act
+emitTagAssertionStrict :: String -> CmmExpr -> FCode ()
+emitTagAssertionStrict onWhat fun = do
+ { platform <- getPlatform
+ ; lret <- newBlockId
+ ; lno_tag <- newBlockId
+ ; lbarf <- newBlockId
+ -- Check for presence of any tag.
+ ; emit $ mkCbranch (cmmIsTagged platform fun)
+ lret lno_tag (Just True)
+ -- If there is no tag check if we are dealing with an untagged object
+ ; emitLabel lno_tag
+ ; needsTaggedPointer fun lbarf lret
+
+ ; emitLabel lbarf
+ ; emitBarf ("Tag eval failed on:" ++ onWhat)
+ ; emitLabel lret
+ }
+
+-- | Jump to the first block if the argument is subject
+-- to tagging requirements. Otherwise jump to the 2nd one.
+needsTaggedPointer :: CmmExpr -> BlockId -> BlockId -> FCode ()
+needsTaggedPointer val fail lpass = do
+ profile <- getProfile
+ align_check <- stgToCmmAlignCheck <$> getStgToCmmConfig
+ let clo_ty_e = cmmGetClosureType profile align_check val
+ -- The ENTER macro doesn't evaluate FUN/PAP/BCO objects. So we
+ -- have to accept them not being tagged. See #21193
+ -- See Note [TagInfo of functions]
+ let targets = mkSwitchTargets
+ False
+ (INVALID_OBJECT, N_CLOSURE_TYPES)
+ (Just lpass)
+ (M.fromList [(THUNK, fail),
+ (THUNK_1_0, fail),
+ (THUNK_0_1, fail),
+ (THUNK_2_0, fail),
+ (THUNK_1_1, fail),
+ (THUNK_0_2, fail),
+ (THUNK_STATIC, fail),
+ (THUNK_SELECTOR, fail)])
+
+ emit $ mkSwitch clo_ty_e targets
+
+ emit $ mkBranch lpass
+
-- | Call barf if we failed to predict a tag correctly.
-- This is immensely useful when debugging issues in tag inference
-- as it will result in a program abort when we encounter an invalid
@@ -112,15 +158,15 @@ needsArgTag closure fail lpass = do
False
(INVALID_OBJECT, N_CLOSURE_TYPES)
(Just fail)
- (M.fromList [(PAP,lpass)
- ,(BCO,lpass)
- ,(FUN,lpass)
- ,(FUN_1_0,lpass)
- ,(FUN_0_1,lpass)
- ,(FUN_2_0,lpass)
- ,(FUN_1_1,lpass)
- ,(FUN_0_2,lpass)
- ,(FUN_STATIC,lpass)
+ (M.fromList [(PAP,lpass) -- 25
+ ,(BCO,lpass) -- 23
+ ,(FUN,lpass) -- 8
+ ,(FUN_1_0,lpass) -- 9
+ ,(FUN_0_1,lpass) -- 10
+ ,(FUN_2_0,lpass) -- 11
+ ,(FUN_1_1,lpass) -- 12
+ ,(FUN_0_2,lpass) -- 13
+ ,(FUN_STATIC,lpass) -- 14
])
emit $ mkSwitch clo_ty_e targets
=====================================
compiler/GHC/Types/RepType.hs
=====================================
@@ -29,6 +29,7 @@ module GHC.Types.RepType
import GHC.Prelude
import GHC.Types.Basic (Arity, RepArity)
+import GHC.Builtin.Names (strictTyConKey)
import GHC.Core.DataCon
import GHC.Core.Coercion
import GHC.Core.TyCon
@@ -100,6 +101,10 @@ unwrapType ty
go t | Just t' <- coreView t = go t'
go (ForAllTy _ t) = go t
go (CastTy t _) = go t
+ -- Look through Strict types
+ go (TyConApp tc [t])
+ | tyConUnique tc == strictTyConKey
+ = go t
go t = t
-- cf. GHC.Core.Coercion.unwrapNewTypeStepper
@@ -248,29 +253,46 @@ ubxSumRepType constrs0
layoutUbxSum :: HasDebugCallStack
=> SortedSlotTys -- Layout of sum. Does not include tag.
-- We assume that they are in increasing order
- -> [SlotTy] -- Slot types of things we want to map to locations in the
- -- sum layout
+ -> [(SlotTy, Bool)] -- Slot types of things we want to map to locations in
+ -- the sum layout. The Bool says whether a lifted
+ -- pointer may occupy an unlifted slot, i.e. it is
+ -- already evaluated.
-> [Int] -- Where to map 'things' in the sum layout
layoutUbxSum sum_slots0 arg_slots0 =
go arg_slots0 IS.empty
where
- go :: [SlotTy] -> IS.IntSet -> [Int]
+ go :: [(SlotTy, Bool)] -> IS.IntSet -> [Int]
go [] _
= []
go (arg : args) used
- = let slot_idx = findSlot arg 0 sum_slots0 used
- in slot_idx : go args (IS.insert slot_idx used)
-
- findSlot :: SlotTy -> Int -> SortedSlotTys -> IS.IntSet -> Int
+ = let slot_idx
+ | Just slot_idx <- findSlot (fst arg) 0 sum_slots0 used
+ = Just slot_idx
+ -- All pointer slots hold a heap pointer, so an unlifted pointer can
+ -- occupy a lifted slot. This bridges the gap left by 'unwrapType'
+ -- looking through Strict: the sum layout may have a lifted slot
+ -- where the argument is an (unlifted) Strict box.
+ | PtrUnliftedSlot <- fst arg
+ = findSlot PtrLiftedSlot 0 sum_slots0 used
+ -- An already-evaluated lifted pointer can occupy an unlifted slot.
+ | PtrLiftedSlot <- fst arg, snd arg
+ = findSlot PtrUnliftedSlot 0 sum_slots0 used
+ | otherwise
+ = Nothing
+ in case slot_idx of
+ Just slot_idx -> slot_idx : go args (IS.insert slot_idx used)
+ Nothing -> pprPanic "layoutUbxSum" ( text "Can't find slot for arg" <+> ppr arg
+ $$ text "sum_slots:" <> ppr sum_slots0
+ $$ text "arg_slots:" <> ppr arg_slots0)
+
+ findSlot :: SlotTy -> Int -> SortedSlotTys -> IS.IntSet -> Maybe Int
findSlot arg slot_idx (slot : slots) useds
| not (IS.member slot_idx useds)
, Just slot == arg `fitsIn` slot
- = slot_idx
+ = Just slot_idx
| otherwise
= findSlot arg (slot_idx + 1) slots useds
- findSlot _ _ [] _
- = pprPanic "findSlot" (text "Can't find slot" $$ text "sum_slots:" <> ppr sum_slots0
- $$ text "arg_slots:" <> ppr arg_slots0 )
+ findSlot _ _ [] _ = Nothing
--------------------------------------------------------------------------------
@@ -730,10 +752,6 @@ mightBeFunTy :: Type -> Bool
-- In particular, 'isFunTy' returns @False@ for @IO ()@ as well as for all
-- type family applications.
mightBeFunTy ty
- -- GHC (currently) has no unlifted functions, so an unlifted type is
- -- definitely not a function type.
- | definitelyUnliftedType ty
- = False
| Just tc <- tyConAppTyCon_maybe (unwrap_type ty)
-- A proper datatype (such as 'Int' or 'Maybe Bool') is definitely not
-- a function type. (This does not include newtypes nor type families.)
=====================================
testsuite/tests/codeGen/should_run/StrictBox.hs
=====================================
@@ -0,0 +1,44 @@
+{-# LANGUAGE BangPatterns #-}
+
+-- | Exercises the strict-field/Strict# machinery end to end:
+--
+-- * a strict value field built from a thunk, which must be forced to a
+-- properly-tagged value (EPT) when the constructor is built;
+-- * a strict field of /function/ type, whose box is unlifted but is applied
+-- as a function (the "might be a function" call path);
+-- * worker/wrapper unboxing a strict argument through Strict#;
+-- * a strict field holding another boxed value, passed around by value.
+--
+-- Run with -dtag-inference-checks so that any strict field that is not
+-- evaluated-and-properly-tagged aborts at runtime.
+module Main (main) where
+
+-- Strict value field + strict function field
+data Box a = Box !a !(Int -> Int)
+
+{-# NOINLINE mkBox #-}
+mkBox :: Int -> Box Int
+mkBox n = Box (sum [1..n]) (\x -> x + n) -- field 1 from a thunk; field 2 a closure
+
+{-# NOINLINE useBox #-}
+useBox :: Box Int -> Int
+useBox (Box a f) = a + f 100 -- applies the strict function field
+
+-- A strict field holding another boxed value
+data Wrap = Wrap !(Box Int)
+
+{-# NOINLINE useWrap #-}
+useWrap :: Wrap -> Int
+useWrap (Wrap b) = useBox b
+
+-- Worker/wrapper unboxes the strict argument through Strict#
+{-# NOINLINE strictArg #-}
+strictArg :: Int -> Int -> Int
+strictArg !x y = x * 1000 + y
+
+main :: IO ()
+main = do
+ print (useBox (mkBox 5)) -- 15 + (100+5) = 120
+ print (strictArg (3 + 4) 9) -- 7*1000 + 9 = 7009
+ print (useWrap (Wrap (mkBox 3))) -- 6 + (100+3) = 109
+ print (map (useBox . mkBox) [1, 2, 3]) -- [102, 105, 109]
=====================================
testsuite/tests/codeGen/should_run/StrictBox.stdout
=====================================
@@ -0,0 +1,4 @@
+120
+7009
+109
+[102,105,109]
=====================================
testsuite/tests/codeGen/should_run/all.T
=====================================
@@ -289,3 +289,7 @@ test('T27072w', [req_c, js_skip, when(opsys('darwin'), skip)],
# AArch64-specific runtime tests
test('aarch64-ushr-subword-run', [unless(arch('aarch64'), skip)], compile_and_run, ['-O'])
test('aarch64-subword-ops', [unless(arch('aarch64'), skip)], compile_and_run, ['-O'])
+
+# Strict# / strict-field machinery, with runtime tag-inference checks
+test('StrictBox', normal, compile_and_run,
+ ['-O -dtag-inference-checks -fmax-simplifier-iterations=20'])
=====================================
testsuite/tests/core-to-stg/T24124.stderr
=====================================
@@ -1,17 +1,36 @@
==================== Final STG: ====================
-T24124.MkStrictPair [InlPrag=CONLIKE]
+T24124.$WMkStrictPair [InlPrag=INLINE[final] CONLIKE]
:: forall a b. a %1 -> b %1 -> T24124.StrictPair a b
-[GblId[DataCon],
+[GblId[DataConWrapper],
Arity=2,
Caf=NoCafRefs,
Str=<SL><SL>,
Unf=OtherCon []] =
- {} \r [eta eta]
- case eta of eta {
+ {} \r [conrep conrep]
+ case conrep of $WMkStrictPair_sat {
+ __DEFAULT ->
+ case $WMkStrictPair_sat<TagProper> of conrep_ubx {
+ __DEFAULT ->
+ case conrep of $WMkStrictPair_sat {
__DEFAULT ->
- case eta of eta { __DEFAULT -> T24124.MkStrictPair [eta eta]; };
+ case $WMkStrictPair_sat<TagProper> of conrep_ubx {
+ __DEFAULT -> T24124.MkStrictPair [conrep_ubx conrep_ubx];
};
+ };
+ };
+ };
+
+T24124.MkStrictPair [InlPrag=CONLIKE]
+ :: forall {a} {b}.
+ GHC.Internal.Types.Strict# a
+ %1 -> GHC.Internal.Types.Strict# b %1 -> T24124.StrictPair a b
+[GblId[DataCon],
+ Arity=2,
+ Caf=NoCafRefs,
+ Str=<SL><SL>,
+ Unf=OtherCon []] =
+ {} \r [eta eta] T24124.MkStrictPair [eta eta];
T24124.testFun1
:: forall a b.
@@ -20,13 +39,18 @@ T24124.testFun1
-> GHC.Internal.Prim.State# GHC.Internal.Prim.RealWorld
-> (# GHC.Internal.Prim.State# GHC.Internal.Prim.RealWorld,
T24124.StrictPair a b #)
-[GblId, Arity=3, Str=<L><L><L>, Cpr=1, Unf=OtherCon []] =
+[GblId, Arity=3, Str=<L><ML><L>, Cpr=1, Unf=OtherCon []] =
{} \r [x y void]
case x of testFun1_sat {
__DEFAULT ->
+ case y of wild {
+ __DEFAULT ->
case
- case y of y [OS=OneShot] {
- __DEFAULT -> T24124.MkStrictPair [testFun1_sat y];
+ case wild<TagProper> of testFun1_sat {
+ __DEFAULT ->
+ case testFun1_sat<TagProper> of testFun1_sat {
+ __DEFAULT -> T24124.MkStrictPair [testFun1_sat testFun1_sat];
+ };
}
of
testFun1_sat
@@ -34,11 +58,12 @@ T24124.testFun1
__DEFAULT -> GHC.Internal.Types.MkSolo# [testFun1_sat];
};
};
+ };
T24124.testFun
:: forall a b.
a -> b -> GHC.Internal.Types.IO (T24124.StrictPair a b)
-[GblId, Arity=3, Str=<L><L><L>, Cpr=1, Unf=OtherCon []] =
+[GblId, Arity=3, Str=<L><ML><L>, Cpr=1, Unf=OtherCon []] =
{} \r [eta eta void]
T24124.testFun1 eta eta GHC.Internal.Prim.void#;
=====================================
testsuite/tests/ghci.debugger/scripts/T13825-debugger.stdout
=====================================
@@ -1,9 +1,10 @@
Packed1 12.34# 56.78# 42# 99.99#
packed1 = Packed1 12.34 56.78 42 99.99
Packed2 12.34 56.78 42 99.99
-packed2 = Packed2 12.34 56.78 42 99.99
+packed2 = Packed2 (F# 12.34) (F# 56.78) (I# 42) (F# 99.99)
Packed3 1 2 3 4 5 6 7.8 9.0
packed3 = Packed3
(GHC.Internal.Word.W8# 1) (GHC.Internal.Int.I8# 2)
(GHC.Internal.Int.I64# 3) (GHC.Internal.Word.W16# 4)
- (GHC.Internal.Word.W64# 5) (GHC.Internal.Word.W32# 6) 7.8 9.0
+ (GHC.Internal.Word.W64# 5) (GHC.Internal.Word.W32# 6) (F# 7.8)
+ (D# 9.0)
=====================================
testsuite/tests/ghci.debugger/scripts/print007.stdout
=====================================
@@ -1,6 +1,6 @@
()
-s = S2 'a' 'b'
+s = S2 'a' (GHC.Internal.Types.C# 'b')
()
-s = S2 'a' 'b'
+s = S2 'a' (GHC.Internal.Types.C# 'b')
()
s = S2 'a' 'b'
=====================================
testsuite/tests/ghci.debugger/scripts/print022.stdout
=====================================
@@ -4,5 +4,5 @@ Breakpoint 0 activated at print022.hs:11:7
Stopped in Main.f, print022.hs:11:7
_result :: p = _
x :: p = _
-x = C2 1 (W# 32) (TwoFields 'a' 3)
+x = C2 (I# 1) (W# 32) (TwoFields 'a' 3)
x :: T2
=====================================
testsuite/tests/simplStg/should_compile/T15226b.stderr
=====================================
@@ -1,12 +1,28 @@
==================== Final STG: ====================
-T15226b.Str [InlPrag=CONLIKE] :: forall a. a %1 -> T15226b.Str a
+T15226b.$WStr [InlPrag=INLINE[final] CONLIKE]
+ :: forall a. a %1 -> T15226b.Str a
+[GblId[DataConWrapper],
+ Arity=1,
+ Caf=NoCafRefs,
+ Str=<SL>,
+ Unf=OtherCon []] =
+ {} \r [conrep]
+ case conrep of $WStr_sat {
+ __DEFAULT ->
+ case $WStr_sat<TagProper> of conrep_ubx {
+ __DEFAULT -> T15226b.Str [conrep_ubx];
+ };
+ };
+
+T15226b.Str [InlPrag=CONLIKE]
+ :: forall {a}. GHC.Internal.Types.Strict# a %1 -> T15226b.Str a
[GblId[DataCon],
Arity=1,
Caf=NoCafRefs,
Str=<SL>,
Unf=OtherCon []] =
- {} \r [eta] case eta of eta { __DEFAULT -> T15226b.Str [eta]; };
+ {} \r [eta] T15226b.Str [eta];
T15226b.bar1
:: forall a.
@@ -20,8 +36,11 @@ T15226b.bar1
__DEFAULT ->
let {
bar1_sat [Occ=Once1] :: T15226b.Str (GHC.Internal.Maybe.Maybe a)
- [LclId, Unf=OtherCon []] =
- T15226b.Str! [bar1_sat];
+ [LclId] =
+ {bar1_sat} \u []
+ case bar1_sat<TagProper> of bar1_sat {
+ __DEFAULT -> T15226b.Str [bar1_sat];
+ };
} in GHC.Internal.Types.MkSolo# [bar1_sat];
};
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/c40b14f19b8f02a50a1420a525b843…
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Teo Camarasu pushed to branch wip/abstract-q at Glasgow Haskell Compiler / GHC
Commits:
d6f6f5c7 by Teo Camarasu at 2026-06-18T19:36:14+01:00
Make Q abstract
This patch aims to clearly demarcate the internal and external interfaces
of Q.
In the past the `Quasi` typeclass was both part of the external,
public-facing interface, and was used to give the implementation of `Q`.
Now we separate out these two distinct roles. `Quasi` continues to exist
in the public interface, but we introduce a new `MetaHandlers` type,
which is equivalent to `Dict Quasi`.
`Q a` is now defined to be `MetaHandlers -> IO a`, and, crucially,
the constructor and the new `MetaHandlers` type are not exposed from the
public interface.
This gives us the ability to vary the interface on the GHC side without
forcing a breaking change on the `template-haskell` side.
Similarly `template-haskell` has more freedom to change the `Quasi`
typeclass without needing any changes in `lib:ghc`.
Implements https://github.com/ghc-proposals/ghc-proposals/pull/70
Resolves #27341
- - - - -
9 changed files:
- + changelog.d/AbstractQ
- compiler/GHC/Data/IOEnv.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Gen/Splice.hs-boot
- libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
- libraries/ghci/GHCi/TH.hs
- libraries/template-haskell/Language/Haskell/TH/Syntax.hs
- testsuite/tests/interface-stability/template-haskell-exports.stdout
Changes:
=====================================
changelog.d/AbstractQ
=====================================
@@ -0,0 +1,9 @@
+section: template-haskell
+synopsis: Hide the implementation of Q
+description: The constructor of Q is now hidden.
+ This is done to improve the stability of ``template-haskell``.
+ To minimize breakage, we have added a new ``qRunQ`` operation to ``Quasi``.
+ The ``Quasi TcM`` instance is no longer exposed from the ``ghc`` API.
+ See the `GHC proposal <https://github.com/ghc-proposals/ghc-proposals/pull/700>`_ for more details.
+mrs: !15696
+issues: #27341
=====================================
compiler/GHC/Data/IOEnv.hs
=====================================
@@ -22,7 +22,7 @@ module GHC.Data.IOEnv (
IOEnvFailure(..),
-- Getting at the environment
- getEnv, setEnv, updEnv, updEnvIO,
+ getEnv, setEnv, updEnv, updEnvIO, withRunInIO,
runIOEnv, unsafeInterleaveM, uninterruptibleMaskM_,
tryM, tryAllM, tryMostM, fixM,
@@ -258,3 +258,12 @@ updEnv upd (IOEnv m) = IOEnv (\ env -> m (upd env))
updEnvIO :: (env -> IO env') -> IOEnv env' a -> IOEnv env a
{-# INLINE updEnvIO #-}
updEnvIO upd (IOEnv m) = IOEnv (\ env -> m =<< upd env)
+
+-- | 'withRunInIO' specialised to `IOEnv`.
+-- See https://hackage.haskell.org/package/unliftio-core/docs/Control-Monad-IO-Unl… for an explanation.
+withRunInIO:: forall env b. ((forall a. IOEnv env a -> IO a) -> IO b) -> IOEnv env b
+withRunInIO k = IOEnv $ \env ->
+ let
+ unlift :: forall a. IOEnv env a -> IO a
+ unlift (IOEnv m) = m env
+ in k unlift
=====================================
compiler/GHC/Tc/Gen/Splice.hs
=====================================
@@ -25,7 +25,7 @@ module GHC.Tc.Gen.Splice(
tcTypedSplice, tcTypedBracket, tcUntypedBracket,
runAnnotation, getUntypedSpliceBody,
- runMetaE, runMetaP, runMetaT, runMetaD, runQuasi,
+ runMetaE, runMetaP, runMetaT, runMetaD, runQinTcM,
tcTopSpliceExpr, lookupThName_maybe,
defaultRunMeta, runMeta', runRemoteModFinalizers,
finishTH, runTopSplice
@@ -138,6 +138,7 @@ import qualified GHC.LanguageExtensions as LangExt
-- THSyntax gives access to internal functions and data types
import qualified GHC.Boot.TH.Syntax as TH
import qualified GHC.Boot.TH.Monad as TH
+import GHC.Boot.TH.Monad (MetaHandlers(..))
import qualified GHC.Boot.TH.Ppr as TH
#if defined(HAVE_INTERNAL_INTERPRETER)
@@ -1138,8 +1139,8 @@ convertAnnotationWrapper fhv = do
************************************************************************
-}
-runQuasi :: TH.Q a -> TcM a
-runQuasi act = TH.runQ act
+runQinTcM :: TH.Q a -> TcM a
+runQinTcM (TH.Q act) = withRunInIO $ \runInIO -> act (metaHandlersTcM runInIO)
runRemoteModFinalizers :: ThModFinalizers -> TcM ()
runRemoteModFinalizers (ThModFinalizers finRefs) = do
@@ -1152,7 +1153,7 @@ runRemoteModFinalizers (ThModFinalizers finRefs) = do
#if defined(HAVE_INTERNAL_INTERPRETER)
InternalInterp -> do
qs <- liftIO (withForeignRefs finRefs $ mapM localRef)
- runQuasi $ sequence_ qs
+ runQinTcM $ sequence_ qs
#endif
ExternalInterp ext -> withExtInterp ext $ \inst -> do
@@ -1466,70 +1467,14 @@ when showing an error message.
To call runQ in the Tc monad, we need to make TcM an instance of Quasi:
-}
-instance TH.Quasi TcM where
- qNewName s = do { u <- newUnique
- ; let i = toInteger (getKey u)
- ; return (TH.mkNameU s i) }
+-- 'msg' is forced to ensure exceptions don't escape,
+-- see Note [Exceptions in TH]
+report :: Bool -> [Char] -> TcM ()
+report True msg = seqList msg $ addErr $ TcRnTHError $ ReportCustomQuasiError True msg
+report False msg = seqList msg $ addDiagnostic $ TcRnTHError $ ReportCustomQuasiError False msg
- -- 'msg' is forced to ensure exceptions don't escape,
- -- see Note [Exceptions in TH]
- qReport True msg = seqList msg $ addErr $ TcRnTHError $ ReportCustomQuasiError True msg
- qReport False msg = seqList msg $ addDiagnostic $ TcRnTHError $ ReportCustomQuasiError False msg
-
- qLocation :: TcM TH.Loc
- qLocation = do { m <- getModule
- ; l <- getSrcSpanM
- ; r <- case l of
- RealSrcSpan s _ -> return s
- GeneratedSrcSpan{} -> pprPanic "qLocation: generatedSrcSpan"
- (pprGeneratedSrcSpanDetails)
- UnhelpfulSpan _ -> pprPanic "qLocation: Unhelpful location"
- (ppr l)
- ; return (TH.Loc { TH.loc_filename = unpackFS (srcSpanFile r)
- , TH.loc_module = moduleNameString (moduleName m)
- , TH.loc_package = unitString (moduleUnit m)
- , TH.loc_start = (srcSpanStartLine r, srcSpanStartCol r)
- , TH.loc_end = (srcSpanEndLine r, srcSpanEndCol r) }) }
-
- qLookupName = lookupName
- qReify = reify
- qReifyFixity nm = lookupThName nm >>= reifyFixity
- qReifyType = reifyTypeOfThing
- qReifyInstances = reifyInstances
- qReifyRoles = reifyRoles
- qReifyAnnotations = reifyAnnotations
- qReifyModule = reifyModule
- qReifyConStrictness nm = do { nm' <- lookupThName nm
- ; dc <- tcLookupDataCon nm'
- ; let bangs = dataConImplBangs dc
- ; return (map reifyDecidedStrictness bangs) }
-
- -- For qRecover, discard error messages if
- -- the recovery action is chosen. Otherwise
- -- we'll only fail higher up.
- qRecover recover main = tryTcDiscardingErrs recover main
-
- qGetPackageRoot = do
- dflags <- getDynFlags
- return $ fromMaybe "." (workingDirectory dflags)
-
- qAddDependentFile fp = do
- ref <- fmap tcg_dependent_files getGblEnv
- dep_files <- readTcRef ref
- writeTcRef ref (fp:dep_files)
-
- qAddDependentDirectory dp = do
- ref <- fmap tcg_dependent_dirs getGblEnv
- dep_dirs <- readTcRef ref
- writeTcRef ref (dp:dep_dirs)
-
- qAddTempFile suffix = do
- dflags <- getDynFlags
- logger <- getLogger
- tmpfs <- hsc_tmpfs <$> getTopEnv
- liftIO $ newTempName logger tmpfs (tmpDir dflags) TFL_GhcSession suffix
-
- qAddTopDecls thds = do
+addTopDecls :: [TH.Dec] -> TcM ()
+addTopDecls thds = do
exts <- fmap extensionFlags getDynFlags
l <- getSrcSpanM
th_origin <- getThSpliceOrigin
@@ -1557,52 +1502,13 @@ instance TH.Quasi TcM where
bindName :: RdrName -> TcM ()
bindName (Exact n)
= do { th_topnames_var <- fmap tcg_th_topnames getGblEnv
- ; updTcRef th_topnames_var (\ns -> extendNameSet ns n)
- }
+ ; updTcRef th_topnames_var (\ns -> extendNameSet ns n)
+ }
bindName name = addErr $ TcRnTHError $ THNameError $ NonExactName name
- qAddForeignFilePath lang fp = do
- var <- fmap tcg_th_foreign_files getGblEnv
- updTcRef var ((lang, fp) :)
-
- qAddModFinalizer fin = do
- r <- liftIO $ mkRemoteRef fin
- fref <- liftIO $ mkForeignRef r (freeRemoteRef r)
- addModFinalizerRef fref
-
- qAddCorePlugin plugin = do
- hsc_env <- getTopEnv
- let fc = hsc_FC hsc_env
- let home_unit = hsc_home_unit hsc_env
- let dflags = hsc_dflags hsc_env
- let fopts = initFinderOpts dflags
- r <- liftIO $ findHomeModule fc fopts home_unit (mkModuleName plugin)
- let err = TcRnTHError $ AddInvalidCorePlugin plugin
- case r of
- Found {} -> addErr err
- FoundMultiple {} -> addErr err
- _ -> return ()
- th_coreplugins_var <- tcg_th_coreplugins <$> getGblEnv
- updTcRef th_coreplugins_var (plugin:)
-
- qGetQ :: forall a. Typeable a => TcM (Maybe a)
- qGetQ = do
- th_state_var <- fmap tcg_th_state getGblEnv
- th_state <- readTcRef th_state_var
- -- See #10596 for why we use a scoped type variable here.
- return (Map.lookup (typeRep (Proxy :: Proxy a)) th_state >>= fromDynamic)
-
- qPutQ x = do
- th_state_var <- fmap tcg_th_state getGblEnv
- updTcRef th_state_var (\m -> Map.insert (typeOf x) (toDyn x) m)
-
- qIsExtEnabled = xoptM
-
- qExtsEnabled =
- EnumSet.toList . extensionFlags . hsc_dflags <$> getTopEnv
-
- qPutDoc doc_loc s = do
+putDoc :: TH.DocLoc -> String -> TcM ()
+putDoc doc_loc s = do
th_doc_var <- tcg_th_docs <$> getGblEnv
resolved_doc_loc <- resolve_loc doc_loc
is_local <- checkLocalName resolved_doc_loc
@@ -1624,15 +1530,131 @@ instance TH.Quasi TcM where
checkLocalName (InstDoc n) = nameIsLocalOrFrom <$> getModule <*> pure n
checkLocalName ModuleDoc = pure True
-
- qGetDoc (TH.DeclDoc n) = lookupThName n >>= lookupDeclDoc
- qGetDoc (TH.InstDoc t) = lookupThInstName t >>= lookupDeclDoc
- qGetDoc (TH.ArgDoc n i) = lookupThName n >>= lookupArgDoc i
- qGetDoc TH.ModuleDoc = do
+getDoc :: TH.DocLoc -> TcM (Maybe String)
+getDoc (TH.DeclDoc n) = lookupThName n >>= lookupDeclDoc
+getDoc (TH.InstDoc t) = lookupThInstName t >>= lookupDeclDoc
+getDoc (TH.ArgDoc n i) = lookupThName n >>= lookupArgDoc i
+getDoc TH.ModuleDoc = do
df <- getDynFlags
docs <- getGblEnv >>= extractDocs df
return (renderHsDocString . hsDocString <$> (docs_mod_hdr =<< docs))
+getQ :: forall a. Typeable a => TcM (Maybe a)
+getQ = do
+ th_state_var <- fmap tcg_th_state getGblEnv
+ th_state <- readTcRef th_state_var
+ -- See #10596 for why we use a scoped type variable here.
+ return (Map.lookup (typeRep (Proxy :: Proxy a)) th_state >>= fromDynamic)
+
+location :: TcM TH.Loc
+location = do { m <- getModule
+ ; l <- getSrcSpanM
+ ; r <- case l of
+ RealSrcSpan s _ -> return s
+ GeneratedSrcSpan{} -> pprPanic "qLocation: generatedSrcSpan"
+ (pprGeneratedSrcSpanDetails)
+ UnhelpfulSpan _ -> pprPanic "qLocation: Unhelpful location"
+ (ppr l)
+ ; return (TH.Loc { TH.loc_filename = unpackFS (srcSpanFile r)
+ , TH.loc_module = moduleNameString (moduleName m)
+ , TH.loc_package = unitString (moduleUnit m)
+ , TH.loc_start = (srcSpanStartLine r, srcSpanStartCol r)
+ , TH.loc_end = (srcSpanEndLine r, srcSpanEndCol r) }) }
+
+metaHandlersTcM :: (forall x. TcM x -> IO x) -> TH.MetaHandlers
+metaHandlersTcM runInIO = TH.MetaHandlers {
+ mLiftIO = id
+ -- We are careful to use the TcM instance not the one for IO, since that would lead to a different error.
+ , mFail = \s -> runInIO $ fail @TcM s
+ , mNewName = \s -> runInIO $ do { u <- newUnique
+ ; let i = toInteger (getKey u)
+ ; return (TH.mkNameU s i) }
+
+ , mReport = fmap runInIO . report
+
+ , mLocation = runInIO location
+
+ , mLookupName = fmap runInIO . lookupName
+ , mReify = runInIO . reify
+ , mReifyFixity = \nm -> runInIO $ lookupThName nm >>= reifyFixity
+ , mReifyType = runInIO . reifyTypeOfThing
+ , mReifyInstances = fmap runInIO . reifyInstances
+ , mReifyRoles = runInIO . reifyRoles
+ , mReifyAnnotations = runInIO . reifyAnnotations
+ , mReifyModule = runInIO . reifyModule
+ , mReifyConStrictness = \nm -> runInIO $ do
+ { nm' <- lookupThName nm
+ ; dc <- tcLookupDataCon nm'
+ ; let bangs = dataConImplBangs dc
+ ; return (map reifyDecidedStrictness bangs) }
+
+ -- For qRecover, discard error messages if
+ -- the recovery action is chosen. Otherwise
+ -- we'll only fail higher up.
+ , mRecover = \recover main -> runInIO $ tryTcDiscardingErrs (runQinTcM recover) (runQinTcM main)
+
+ , mGetPackageRoot = runInIO $ do
+ dflags <- getDynFlags
+ return $ fromMaybe "." (workingDirectory dflags)
+
+ , mAddDependentFile = \fp -> runInIO $ do
+ ref <- fmap tcg_dependent_files getGblEnv
+ dep_files <- readTcRef ref
+ writeTcRef ref (fp:dep_files)
+
+ , mAddDependentDirectory = \dp -> runInIO $ do
+ ref <- fmap tcg_dependent_dirs getGblEnv
+ dep_dirs <- readTcRef ref
+ writeTcRef ref (dp:dep_dirs)
+
+ , mAddTempFile = \suffix -> runInIO $ do
+ dflags <- getDynFlags
+ logger <- getLogger
+ tmpfs <- hsc_tmpfs <$> getTopEnv
+ liftIO $ newTempName logger tmpfs (tmpDir dflags) TFL_GhcSession suffix
+
+ , mAddTopDecls = runInIO . addTopDecls
+
+ , mAddForeignFilePath = \lang fp -> runInIO $ do
+ var <- fmap tcg_th_foreign_files getGblEnv
+ updTcRef var ((lang, fp) :)
+
+ , mAddModFinalizer = \fin -> runInIO $ do
+ r <- liftIO $ mkRemoteRef fin
+ fref <- liftIO $ mkForeignRef r (freeRemoteRef r)
+ addModFinalizerRef fref
+
+ , mAddCorePlugin = \plugin -> runInIO $ do
+ hsc_env <- getTopEnv
+ let fc = hsc_FC hsc_env
+ let home_unit = hsc_home_unit hsc_env
+ let dflags = hsc_dflags hsc_env
+ let fopts = initFinderOpts dflags
+ r <- liftIO $ findHomeModule fc fopts home_unit (mkModuleName plugin)
+ let err = TcRnTHError $ AddInvalidCorePlugin plugin
+ case r of
+ Found {} -> addErr err
+ FoundMultiple {} -> addErr err
+ _ -> return ()
+ th_coreplugins_var <- tcg_th_coreplugins <$> getGblEnv
+ updTcRef th_coreplugins_var (plugin:)
+
+ , mGetQ = runInIO getQ
+
+ , mPutQ = \x -> runInIO $ do
+ th_state_var <- fmap tcg_th_state getGblEnv
+ updTcRef th_state_var (\m -> Map.insert (typeOf x) (toDyn x) m)
+
+ , mIsExtEnabled = runInIO . xoptM
+
+ , mExtsEnabled = runInIO $
+ EnumSet.toList . extensionFlags . hsc_dflags <$> getTopEnv
+
+ , mPutDoc = fmap runInIO . putDoc
+
+ , mGetDoc = runInIO . getDoc
+ }
+
-- | Looks up documentation for a declaration in first the current module,
-- otherwise tries to find it in another module via 'hscGetModuleInterface'.
lookupDeclDoc :: Name -> TcM (Maybe String)
@@ -1788,7 +1810,7 @@ runTH ty fhv = do
InternalInterp -> do
-- Run it in the local TcM
hv <- liftIO $ wormhole interp fhv
- r <- runQuasi (unsafeCoerce hv :: TH.Q a)
+ r <- runQinTcM (unsafeCoerce hv :: TH.Q a)
return r
#endif
@@ -1797,7 +1819,7 @@ runTH ty fhv = do
-- Remote GHCi, see Note [Remote Template Haskell] in
-- libraries/ghci/GHCi/TH.hs.
rstate <- getTHState inst
- loc <- TH.qLocation
+ loc <- location
-- run a remote TH request
r <- liftIO $
withForeignRef rstate $ \state_hv ->
@@ -1913,32 +1935,32 @@ wrapTHResult tcm = do
handleTHMessage :: THMessage a -> TcM a
handleTHMessage msg = case msg of
- NewName a -> wrapTHResult $ TH.qNewName a
- Report b str -> wrapTHResult $ TH.qReport b str
- LookupName b str -> wrapTHResult $ TH.qLookupName b str
- Reify n -> wrapTHResult $ TH.qReify n
- ReifyFixity n -> wrapTHResult $ TH.qReifyFixity n
- ReifyType n -> wrapTHResult $ TH.qReifyType n
- ReifyInstances n ts -> wrapTHResult $ TH.qReifyInstances n ts
- ReifyRoles n -> wrapTHResult $ TH.qReifyRoles n
+ NewName a -> wrapTHResult $ runQinTcM $ TH.newName a
+ Report b str -> wrapTHResult $ runQinTcM $ TH.report b str
+ LookupName b str -> wrapTHResult $ runQinTcM $ TH.lookupName b str
+ Reify n -> wrapTHResult $ runQinTcM $ TH.reify n
+ ReifyFixity n -> wrapTHResult $ runQinTcM $ TH.reifyFixity n
+ ReifyType n -> wrapTHResult $ runQinTcM $ TH.reifyType n
+ ReifyInstances n ts -> wrapTHResult $ runQinTcM $ TH.reifyInstances n ts
+ ReifyRoles n -> wrapTHResult $ runQinTcM $ TH.reifyRoles n
ReifyAnnotations lookup tyrep ->
wrapTHResult $ (map B.pack <$> getAnnotationsByTypeRep lookup tyrep)
- ReifyModule m -> wrapTHResult $ TH.qReifyModule m
- ReifyConStrictness nm -> wrapTHResult $ TH.qReifyConStrictness nm
- GetPackageRoot -> wrapTHResult $ TH.qGetPackageRoot
- AddDependentFile f -> wrapTHResult $ TH.qAddDependentFile f
- AddDependentDirectory d -> wrapTHResult $ TH.qAddDependentDirectory d
- AddTempFile s -> wrapTHResult $ TH.qAddTempFile s
+ ReifyModule m -> wrapTHResult $ runQinTcM $ TH.reifyModule m
+ ReifyConStrictness nm -> wrapTHResult $ runQinTcM $ TH.reifyConStrictness nm
+ GetPackageRoot -> wrapTHResult $ runQinTcM $ TH.getPackageRoot
+ AddDependentFile f -> wrapTHResult $ runQinTcM $ TH.addDependentFile f
+ AddDependentDirectory d -> wrapTHResult $ runQinTcM $ TH.addDependentDirectory d
+ AddTempFile s -> wrapTHResult $ runQinTcM $ TH.addTempFile s
AddModFinalizer r -> do
interp <- hscInterp <$> getTopEnv
wrapTHResult $ liftIO (mkFinalizedHValue interp r) >>= addModFinalizerRef
- AddCorePlugin str -> wrapTHResult $ TH.qAddCorePlugin str
- AddTopDecls decs -> wrapTHResult $ TH.qAddTopDecls decs
- AddForeignFilePath lang str -> wrapTHResult $ TH.qAddForeignFilePath lang str
- IsExtEnabled ext -> wrapTHResult $ TH.qIsExtEnabled ext
- ExtsEnabled -> wrapTHResult $ TH.qExtsEnabled
- PutDoc l s -> wrapTHResult $ TH.qPutDoc l s
- GetDoc l -> wrapTHResult $ TH.qGetDoc l
+ AddCorePlugin str -> wrapTHResult $ runQinTcM $ TH.addCorePlugin str
+ AddTopDecls decs -> wrapTHResult $ runQinTcM $ TH.addTopDecls decs
+ AddForeignFilePath lang str -> wrapTHResult $ runQinTcM $ TH.addForeignFilePath lang str
+ IsExtEnabled ext -> wrapTHResult $ runQinTcM $ TH.isExtEnabled ext
+ ExtsEnabled -> wrapTHResult $ runQinTcM $ TH.extsEnabled
+ PutDoc l s -> wrapTHResult $ runQinTcM $ TH.putDoc l s
+ GetDoc l -> wrapTHResult $ runQinTcM $ TH.getDoc l
FailIfErrs -> wrapTHResult failIfErrsM
_ -> panic ("handleTHMessage: unexpected message " ++ show msg)
=====================================
compiler/GHC/Tc/Gen/Splice.hs-boot
=====================================
@@ -42,6 +42,6 @@ runMetaT :: LHsExpr GhcTc -> TcM (LHsType GhcPs)
runMetaD :: LHsExpr GhcTc -> TcM [LHsDecl GhcPs]
lookupThName_maybe :: TH.Name -> TcM (Maybe Name)
-runQuasi :: TH.Q a -> TcM a
+runQinTcM :: TH.Q a -> TcM a
runRemoteModFinalizers :: ThModFinalizers -> TcM ()
finishTH :: TcM ()
=====================================
libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
=====================================
@@ -1079,7 +1079,7 @@ withDecDoc :: String -> Q Dec -> Q Dec
withDecDoc doc dec = do
dec' <- dec
case doc_loc dec' of
- Just loc -> qAddModFinalizer $ qPutDoc loc doc
+ Just loc -> addModFinalizer $ putDoc loc doc
Nothing -> pure ()
pure dec'
where
@@ -1128,7 +1128,7 @@ funD_doc :: Name -> [Q Clause]
-> [Maybe String] -- ^ Documentation to attach to arguments
-> Q Dec
funD_doc nm cs mfun_doc arg_docs = do
- qAddModFinalizer $ sequence_
+ addModFinalizer $ sequence_
[putDoc (ArgDoc nm i) s | (i, Just s) <- zip [0..] arg_docs]
let dec = funD nm cs
case mfun_doc of
@@ -1145,7 +1145,7 @@ dataD_doc :: Q Cxt -> Name -> [Q (TyVarBndr BndrVis)] -> Maybe (Q Kind)
-- ^ Documentation to attach to the data declaration
-> Q Dec
dataD_doc ctxt tc tvs ksig cons_with_docs derivs mdoc = do
- qAddModFinalizer $ mapM_ docCons cons_with_docs
+ addModFinalizer $ mapM_ docCons cons_with_docs
let dec = dataD ctxt tc tvs ksig (map (\(con, _, _) -> con) cons_with_docs) derivs
maybe dec (flip withDecDoc dec) mdoc
@@ -1159,7 +1159,7 @@ newtypeD_doc :: Q Cxt -> Name -> [Q (TyVarBndr BndrVis)] -> Maybe (Q Kind)
-- ^ Documentation to attach to the newtype declaration
-> Q Dec
newtypeD_doc ctxt tc tvs ksig con_with_docs@(con, _, _) derivs mdoc = do
- qAddModFinalizer $ docCons con_with_docs
+ addModFinalizer $ docCons con_with_docs
let dec = newtypeD ctxt tc tvs ksig con derivs
maybe dec (flip withDecDoc dec) mdoc
@@ -1172,7 +1172,7 @@ typeDataD_doc :: Name -> [Q (TyVarBndr BndrVis)] -> Maybe (Q Kind)
-- ^ Documentation to attach to the data declaration
-> Q Dec
typeDataD_doc tc tvs ksig cons_with_docs mdoc = do
- qAddModFinalizer $ mapM_ docCons cons_with_docs
+ addModFinalizer $ mapM_ docCons cons_with_docs
let dec = typeDataD tc tvs ksig (map (\(con, _, _) -> con) cons_with_docs)
maybe dec (flip withDecDoc dec) mdoc
@@ -1186,7 +1186,7 @@ dataInstD_doc :: Q Cxt -> (Maybe [Q (TyVarBndr ())]) -> Q Type -> Maybe (Q Kind)
-- ^ Documentation to attach to the instance declaration
-> Q Dec
dataInstD_doc ctxt mb_bndrs ty ksig cons_with_docs derivs mdoc = do
- qAddModFinalizer $ mapM_ docCons cons_with_docs
+ addModFinalizer $ mapM_ docCons cons_with_docs
let dec = dataInstD ctxt mb_bndrs ty ksig (map (\(con, _, _) -> con) cons_with_docs)
derivs
maybe dec (flip withDecDoc dec) mdoc
@@ -1202,7 +1202,7 @@ newtypeInstD_doc :: Q Cxt -> (Maybe [Q (TyVarBndr ())]) -> Q Type
-- ^ Documentation to attach to the instance declaration
-> Q Dec
newtypeInstD_doc ctxt mb_bndrs ty ksig con_with_docs@(con, _, _) derivs mdoc = do
- qAddModFinalizer $ docCons con_with_docs
+ addModFinalizer $ docCons con_with_docs
let dec = newtypeInstD ctxt mb_bndrs ty ksig con derivs
maybe dec (flip withDecDoc dec) mdoc
@@ -1212,7 +1212,7 @@ patSynD_doc :: Name -> Q PatSynArgs -> Q PatSynDir -> Q Pat
-> [Maybe String] -- ^ Documentation to attach to the pattern arguments
-> Q Dec
patSynD_doc name args dir pat mdoc arg_docs = do
- qAddModFinalizer $ sequence_
+ addModFinalizer $ sequence_
[putDoc (ArgDoc name i) s | (i, Just s) <- zip [0..] arg_docs]
let dec = patSynD name args dir pat
maybe dec (flip withDecDoc dec) mdoc
=====================================
libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
=====================================
@@ -29,13 +29,13 @@ import Data.Data hiding (Fixity(..))
import Data.IORef
import System.IO.Unsafe (unsafePerformIO)
import Control.Monad.IO.Class (MonadIO (..))
-import System.IO (FilePath, hPutStrLn, stderr)
+import System.IO (hPutStrLn, stderr)
import qualified Data.Kind as Kind (Type)
import GHC.Types (TYPE, RuntimeRep(..))
#else
import GHC.Internal.Base (
Applicative(..), Functor(..), Monad(..), Monoid(..), Semigroup(..), String,
- flip, id, (.), (++),
+ flip, id, (.), (++), ($),
)
import GHC.Internal.Classes (not)
import GHC.Internal.Data.Data hiding (Fixity(..))
@@ -59,145 +59,150 @@ import GHC.Internal.ForeignSrcLang
import GHC.Internal.LanguageExtensions
import GHC.Internal.TH.Syntax
------------------------------------------------------
---
--- The Quasi class
---
------------------------------------------------------
-
-class (MonadIO m, MonadFail m) => Quasi m where
- -- | Fresh names. See 'newName'.
- qNewName :: String -> m Name
-
- ------- Error reporting and recovery -------
- -- | Report an error (True) or warning (False)
- -- ...but carry on; use 'fail' to stop. See 'report'.
- qReport :: Bool -> String -> m ()
-
- -- | See 'recover'.
- qRecover :: m a -- ^ the error handler
- -> m a -- ^ action which may fail
- -> m a -- ^ Recover from the monadic 'fail'
-
- ------- Inspect the type-checker's environment -------
- -- | True <=> type namespace, False <=> value namespace. See 'lookupName'.
- qLookupName :: Bool -> String -> m (Maybe Name)
- -- | See 'reify'.
- qReify :: Name -> m Info
- -- | See 'reifyFixity'.
- qReifyFixity :: Name -> m (Maybe Fixity)
- -- | See 'reifyType'.
- qReifyType :: Name -> m Type
- -- | Is (n tys) an instance? Returns list of matching instance Decs (with
- -- empty sub-Decs) Works for classes and type functions. See 'reifyInstances'.
- qReifyInstances :: Name -> [Type] -> m [Dec]
- -- | See 'reifyRoles'.
- qReifyRoles :: Name -> m [Role]
- -- | See 'reifyAnnotations'.
- qReifyAnnotations :: Data a => AnnLookup -> m [a]
- -- | See 'reifyModule'.
- qReifyModule :: Module -> m ModuleInfo
- -- | See 'reifyConStrictness'.
- qReifyConStrictness :: Name -> m [DecidedStrictness]
-
- -- | See 'location'.
- qLocation :: m Loc
-
- -- | Input/output (dangerous). See 'runIO'.
- qRunIO :: IO a -> m a
- qRunIO = liftIO
- -- | See 'getPackageRoot'.
- qGetPackageRoot :: m FilePath
-
- -- | See 'addDependentFile'.
- qAddDependentFile :: FilePath -> m ()
-
- -- | See 'addDependentDirectory'.
- qAddDependentDirectory :: FilePath -> m ()
-
- -- | See 'addTempFile'.
- qAddTempFile :: String -> m FilePath
-
- -- | See 'addTopDecls'.
- qAddTopDecls :: [Dec] -> m ()
-
- -- | See 'addForeignFilePath'.
- qAddForeignFilePath :: ForeignSrcLang -> String -> m ()
-
- -- | See 'addModFinalizer'.
- qAddModFinalizer :: Q () -> m ()
-
- -- | See 'addCorePlugin'.
- qAddCorePlugin :: String -> m ()
-
- -- | See 'getQ'.
- qGetQ :: Typeable a => m (Maybe a)
-
- -- | See 'putQ'.
- qPutQ :: Typeable a => a -> m ()
-
- -- | See 'isExtEnabled'.
- qIsExtEnabled :: Extension -> m Bool
- -- | See 'extsEnabled'.
- qExtsEnabled :: m [Extension]
-
- -- | See 'putDoc'.
- qPutDoc :: DocLoc -> String -> m ()
- -- | See 'getDoc'.
- qGetDoc :: DocLoc -> m (Maybe String)
+-- | 'MetaHandlers' defines the interface between GHC and TH splices.
+-- This is an internal interface between two parts of the compiler,
+-- and should never be directly exposed to users.
+--
+-- It mirrors the 'Quasi' typeclass, which is part of the public facing interface of TH.
+-- With time the two interfaces may drift apart.
+--
+-- This type is defined in `ghc-internal` rather than `lib:ghc` to avoid
+-- `template-haskell` having to depend on GHC, ie, it implements dependency inversion.
+--
+-- For more information about the historical design of this interface,
+-- see: https://github.com/ghc-proposals/ghc-proposals/pull/700
+data MetaHandlers = MetaHandlers {
+ -- | We have an explicit handler for liftIO to allow users to forbid lifting into 'IO'
+ mLiftIO :: forall a. IO a -> IO a
+ , mFail :: forall a. String -> IO a
+ -- | Fresh names. See 'newName'.
+ , mNewName :: String -> IO Name
+
+ ------- Error reporting and recovery -------
+ -- | Report an error (True) or warning (False)
+ -- ...but carry on; use 'fail' to stop. See 'report'.
+ , mReport :: Bool -> String -> IO ()
+
+ -- | See 'recover'.
+ , mRecover :: forall a. Q a -- ^ the error handler
+ -> Q a -- ^ action which may fail
+ -> IO a -- ^ Recover from the monadic 'fail'
+
+ ------- Inspect the type-checker's environment -------
+ -- | True <=> type namespace, False <=> value namespace. See 'lookupName'.
+ , mLookupName :: Bool -> String -> IO (Maybe Name)
+ -- | See 'reify'.
+ , mReify :: Name -> IO Info
+ -- | See 'reifyFixity'.
+ , mReifyFixity :: Name -> IO (Maybe Fixity)
+ -- | See 'reifyType'.
+ , mReifyType :: Name -> IO Type
+ -- | Is (n tys) an instance? Returns list of matching instance Decs (with
+ -- empty sub-Decs) Works for classes and type functions. See 'reifyInstances'.
+ , mReifyInstances :: Name -> [Type] -> IO [Dec]
+ -- | See 'reifyRoles'.
+ , mReifyRoles :: Name -> IO [Role]
+ -- | See 'reifyAnnotations'.
+ , mReifyAnnotations :: forall a. Data a => AnnLookup -> IO [a]
+ -- | See 'reifyModule'.
+ , mReifyModule :: Module -> IO ModuleInfo
+ -- | See 'reifyConStrictness'.
+ , mReifyConStrictness :: Name -> IO [DecidedStrictness]
+
+ -- | See 'location'.
+ , mLocation :: IO Loc
+
+ -- | See 'getPackageRoot'.
+ , mGetPackageRoot :: IO FilePath
+
+ -- | See 'addDependentFile'.
+ , mAddDependentFile :: FilePath -> IO ()
+
+ -- | See 'addDependentDirectory'.
+ , mAddDependentDirectory :: FilePath -> IO ()
+
+ -- | See 'addTempFile'.
+ , mAddTempFile :: String -> IO FilePath
+
+ -- | See 'addTopDecls'.
+ , mAddTopDecls :: [Dec] -> IO ()
+
+ -- | See 'addForeignFilePath'.
+ , mAddForeignFilePath :: ForeignSrcLang -> String -> IO ()
+
+ -- | See 'addModFinalizer'.
+ , mAddModFinalizer :: Q () -> IO ()
+
+ -- | See 'addCorePlugin'.
+ , mAddCorePlugin :: String -> IO ()
+
+ -- | See 'getQ'.
+ , mGetQ :: forall a. Typeable a => IO (Maybe a)
+
+ -- | See 'putQ'.
+ , mPutQ :: forall a. Typeable a => a -> IO ()
+
+ -- | See 'isExtEnabled'.
+ , mIsExtEnabled :: Extension -> IO Bool
+ -- | See 'extsEnabled'.
+ , mExtsEnabled :: IO [Extension]
+
+ -- | See 'putDoc'.
+ , mPutDoc :: DocLoc -> String -> IO ()
+ -- | See 'getDoc'.
+ , mGetDoc :: DocLoc -> IO (Maybe String)
+ }
------------------------------------------------------
--- The IO instance of Quasi
------------------------------------------------------
+badIO :: String -> IO a
+badIO op = do { hPutStrLn stderr ("Can't do `" ++ op ++ "' in the IO monad")
+ ; fail "Template Haskell failure" }
--- | This instance is used only when running a Q
--- computation in the IO monad, usually just to
--- print the result. There is no interesting
--- type environment, so reification isn't going to
--- work.
-instance Quasi IO where
- qNewName = newNameIO
-
- qReport True msg = hPutStrLn stderr ("Template Haskell error: " ++ msg)
- qReport False msg = hPutStrLn stderr ("Template Haskell error: " ++ msg)
-
- qLookupName _ _ = badIO "lookupName"
- qReify _ = badIO "reify"
- qReifyFixity _ = badIO "reifyFixity"
- qReifyType _ = badIO "reifyFixity"
- qReifyInstances _ _ = badIO "reifyInstances"
- qReifyRoles _ = badIO "reifyRoles"
- qReifyAnnotations _ = badIO "reifyAnnotations"
- qReifyModule _ = badIO "reifyModule"
- qReifyConStrictness _ = badIO "reifyConStrictness"
- qLocation = badIO "currentLocation"
- qRecover _ _ = badIO "recover" -- Maybe we could fix this?
- qGetPackageRoot = badIO "getProjectRoot"
- qAddDependentFile _ = badIO "addDependentFile"
- qAddTempFile _ = badIO "addTempFile"
- qAddTopDecls _ = badIO "addTopDecls"
- qAddForeignFilePath _ _ = badIO "addForeignFilePath"
- qAddModFinalizer _ = badIO "addModFinalizer"
- qAddCorePlugin _ = badIO "addCorePlugin"
- qGetQ = badIO "getQ"
- qPutQ _ = badIO "putQ"
- qIsExtEnabled _ = badIO "isExtEnabled"
- qExtsEnabled = badIO "extsEnabled"
- qPutDoc _ _ = badIO "putDoc"
- qGetDoc _ = badIO "getDoc"
- qAddDependentDirectory _ = badIO "AddDependentDirectory"
+metaHandlersIO :: MetaHandlers
+metaHandlersIO = MetaHandlers {
+ mLiftIO = id
+ , mFail = fail
+ , mNewName = newNameIO
+ , mReport = \b msg ->
+ if b then
+ hPutStrLn stderr ("Template Haskell error: " ++ msg)
+ else
+ hPutStrLn stderr ("Template Haskell error: " ++ msg) -- TODO: should this be different from above?
+ , mLookupName = \ _ _ -> badIO "lookupName"
+ , mReify = \_ -> badIO "reify"
+ , mReifyFixity = \_ -> badIO "reifyFixity"
+ , mReifyType = \_ -> badIO "reifyFixity"
+ , mReifyInstances = \_ _ -> badIO "reifyInstances"
+ , mReifyRoles = \_ -> badIO "reifyRoles"
+ , mReifyAnnotations = \_ -> badIO "reifyAnnotations"
+ , mReifyModule = \_ -> badIO "reifyModule"
+ , mReifyConStrictness = \_ -> badIO "reifyConStrictness"
+ , mLocation = badIO "currentLocation"
+ , mRecover = \_ _ -> badIO "recover" -- Maybe we could fix this?
+ , mGetPackageRoot = badIO "getProjectRoot"
+ , mAddDependentFile = \_ -> badIO "addDependentFile"
+ , mAddTempFile = \_ -> badIO "addTempFile"
+ , mAddTopDecls = \_ -> badIO "addTopDecls"
+ , mAddForeignFilePath = \_ _ -> badIO "addForeignFilePath"
+ , mAddModFinalizer = \_ -> badIO "addModFinalizer"
+ , mAddCorePlugin = \_ -> badIO "addCorePlugin"
+ , mGetQ = badIO "getQ"
+ , mPutQ = \_ -> badIO "putQ"
+ , mIsExtEnabled = \_ -> badIO "isExtEnabled"
+ , mExtsEnabled = badIO "extsEnabled"
+ , mPutDoc = \_ _ -> badIO "putDoc"
+ , mGetDoc = \_ -> badIO "getDoc"
+ , mAddDependentDirectory = \_ -> badIO "AddDependentDirectory"
+ }
instance Quote IO where
newName = newNameIO
+
+
newNameIO :: String -> IO Name
newNameIO s = do { n <- atomicModifyIORef' counter (\x -> (x + 1, x))
; pure (mkNameU s n) }
-badIO :: String -> IO a
-badIO op = do { qReport True ("Can't do `" ++ op ++ "' in the IO monad")
- ; fail "Template Haskell failure" }
-
-- Global variable to generate unique symbols
counter :: IORef Uniq
{-# NOINLINE counter #-}
@@ -210,46 +215,24 @@ counter = unsafePerformIO (newIORef 0)
--
-----------------------------------------------------
--- | In short, 'Q' provides the 'Quasi' operations in one neat monad for the
--- user.
---
--- The longer story, is that 'Q' wraps an arbitrary 'Quasi'-able monad.
--- The perceptive reader notices that 'Quasi' has only two instances, 'Q'
--- itself and 'IO', neither of which have concrete implementations.'Q' plays
--- the trick of [dependency
--- inversion](https://en.wikipedia.org/wiki/Dependency_inversion_principle),
--- providing an abstract interface for the user which is later concretely
--- fufilled by an concrete 'Quasi' instance, internal to GHC.
-newtype Q a = Q { unQ :: forall m. Quasi m => m a }
-
--- | \"Runs\" the 'Q' monad. Normal users of Template Haskell
--- should not need this function, as the splice brackets @$( ... )@
--- are the usual way of running a 'Q' computation.
---
--- This function is primarily used in GHC internals, and for debugging
--- splices by running them in 'IO'.
---
--- Note that many functions in 'Q', such as 'reify' and other compiler
--- queries, are not supported when running 'Q' in 'IO'; these operations
--- simply fail at runtime. Indeed, the only operations guaranteed to succeed
--- are 'newName', 'runIO', 'reportError' and 'reportWarning'.
-runQ :: Quasi m => Q a -> m a
-runQ (Q m) = m
+-- | 'Q' is the base 'Monad' for TemplateHaskell splices,
+-- similar to how 'IO' is the base 'Monad' for normal Haskell programs.
+newtype Q a = Q { unQ :: MetaHandlers -> IO a }
instance Monad Q where
- Q m >>= k = Q (m >>= \x -> unQ (k x))
+ Q m >>= k = Q $ \h -> (m h >>= \x -> unQ (k x) h)
(>>) = (*>)
instance MonadFail Q where
- fail s = report True s >> Q (fail "Q monad failure")
+ fail s = report True s >> Q (\h -> mFail h "Q monad failure")
instance Functor Q where
- fmap f (Q x) = Q (fmap f x)
+ fmap f (Q x) = Q $ \h -> fmap f (x h)
instance Applicative Q where
- pure x = Q (pure x)
- Q f <*> Q x = Q (f <*> x)
- Q m *> Q n = Q (m *> n)
+ pure x = Q $ \_ -> pure x
+ Q f <*> Q x = Q $ \h -> (f h <*> x h)
+ Q m *> Q n = Q $ \h -> (m h *> n h)
-- | @since 2.17.0.0
instance Semigroup a => Semigroup (Q a) where
@@ -319,7 +302,7 @@ class Monad m => Quote m where
newName :: String -> m Name
instance Quote Q where
- newName s = Q (qNewName s)
+ newName s = Q $ \h -> mNewName h s
-----------------------------------------------------
--
@@ -517,35 +500,26 @@ joinCode = flip bindCode id
-- | Report an error (True) or warning (False),
-- but carry on; use 'fail' to stop.
report :: Bool -> String -> Q ()
-report b s = Q (qReport b s)
-{-# DEPRECATED report "Use reportError or reportWarning instead" #-} -- deprecated in 7.6
-
--- | Report an error to the user, but allow the current splice's computation to carry on. To abort the computation, use 'fail'.
-reportError :: String -> Q ()
-reportError = report True
-
--- | Report a warning to the user, and carry on.
-reportWarning :: String -> Q ()
-reportWarning = report False
+report b s = Q $ \h -> mReport h b s
-- | Recover from errors raised by 'reportError' or 'fail'.
recover :: Q a -- ^ handler to invoke on failure
-> Q a -- ^ computation to run
-> Q a
-recover (Q r) (Q m) = Q (qRecover r m)
+recover rec main = Q $ \h -> mRecover h rec main
-- We don't export lookupName; the Bool isn't a great API
-- Instead we export lookupTypeName, lookupValueName
lookupName :: Bool -> String -> Q (Maybe Name)
-lookupName ns s = Q (qLookupName ns s)
+lookupName ns s = Q $ \h -> mLookupName h ns s
-- | Look up the given name in the (type namespace of the) current splice's scope. See "Language.Haskell.TH.Syntax#namelookup" for more details.
lookupTypeName :: String -> Q (Maybe Name)
-lookupTypeName s = Q (qLookupName True s)
+lookupTypeName s = Q $ \h -> mLookupName h True s
-- | Look up the given name in the (value namespace of the) current splice's scope. See "Language.Haskell.TH.Syntax#namelookup" for more details.
lookupValueName :: String -> Q (Maybe Name)
-lookupValueName s = Q (qLookupName False s)
+lookupValueName s = Q $ \h -> mLookupName h False s
{-
Note [Name lookup]
@@ -620,7 +594,7 @@ To ensure we get information about @D@-the-value, use 'lookupValueName':
and to get information about @D@-the-type, use 'lookupTypeName'.
-}
reify :: Name -> Q Info
-reify v = Q (qReify v)
+reify v = Q $ \h -> mReify h v
{- | @reifyFixity nm@ attempts to find a fixity declaration for @nm@. For
example, if the function @foo@ has the fixity declaration @infixr 7 foo@, then
@@ -629,7 +603,7 @@ example, if the function @foo@ has the fixity declaration @infixr 7 foo@, then
'Nothing', so you may assume @bar@ has 'defaultFixity'.
-}
reifyFixity :: Name -> Q (Maybe Fixity)
-reifyFixity nm = Q (qReifyFixity nm)
+reifyFixity nm = Q $ \h -> mReifyFixity h nm
{- | @reifyType nm@ attempts to find the type or kind of @nm@. For example,
@reifyType 'not@ returns @Bool -> Bool@, and
@@ -637,7 +611,7 @@ reifyFixity nm = Q (qReifyFixity nm)
This works even if there's no explicit signature and the type or kind is inferred.
-}
reifyType :: Name -> Q Type
-reifyType nm = Q (qReifyType nm)
+reifyType nm = Q $ \h -> mReifyType h nm
{- | Template Haskell is capable of reifying information about types and
terms defined in previous declaration groups. Top-level declaration splices break up
@@ -729,7 +703,7 @@ has some discussion around this.
-}
reifyInstances :: Name -> [Type] -> Q [InstanceDec]
-reifyInstances cls tys = Q (qReifyInstances cls tys)
+reifyInstances cls tys = Q $ \h -> mReifyInstances h cls tys
{- | @reifyRoles nm@ returns the list of roles associated with the parameters
(both visible and invisible) of
@@ -748,20 +722,20 @@ and @reifyRoles Proxy@, we will get @['NominalR', 'PhantomR']@. The 'NominalR' i
the role of the invisible @k@ parameter. Kind parameters are always nominal.
-}
reifyRoles :: Name -> Q [Role]
-reifyRoles nm = Q (qReifyRoles nm)
+reifyRoles nm = Q $ \h -> mReifyRoles h nm
-- | @reifyAnnotations target@ returns the list of annotations
-- associated with @target@. Only the annotations that are
-- appropriately typed is returned. So if you have @Int@ and @String@
-- annotations for the same target, you have to call this function twice.
reifyAnnotations :: Data a => AnnLookup -> Q [a]
-reifyAnnotations an = Q (qReifyAnnotations an)
+reifyAnnotations an = Q $ \h -> mReifyAnnotations h an
-- | @reifyModule mod@ looks up information about module @mod@. To
-- look up the current module, call this function with the return
-- value of 'Language.Haskell.TH.Lib.thisModule'.
reifyModule :: Module -> Q ModuleInfo
-reifyModule m = Q (qReifyModule m)
+reifyModule m = Q $ \h -> mReifyModule h m
-- | @reifyConStrictness nm@ looks up the strictness information for the fields
-- of the constructor with the name @nm@. Note that the strictness information
@@ -776,7 +750,7 @@ reifyModule m = Q (qReifyModule m)
-- circumstances, but it would return @['DecidedStrict', DecidedStrict]@ if the
-- @-XStrictData@ language extension was enabled.
reifyConStrictness :: Name -> Q [DecidedStrictness]
-reifyConStrictness n = Q (qReifyConStrictness n)
+reifyConStrictness n = Q $ \h -> mReifyConStrictness h n
-- | Is the list of instances returned by 'reifyInstances' nonempty?
--
@@ -789,7 +763,7 @@ isInstance nm tys = do { decs <- reifyInstances nm tys
-- | The location at which this computation is spliced.
location :: Q Loc
-location = Q qLocation
+location = Q mLocation
-- |The 'runIO' function lets you run an I\/O computation in the 'Q' monad.
-- Take care: you are guaranteed the ordering of calls to 'runIO' within
@@ -799,7 +773,7 @@ location = Q qLocation
-- necessarily flushed when the compiler finishes running, so you should
-- flush them yourself.
runIO :: IO a -> Q a
-runIO m = Q (qRunIO m)
+runIO m = Q $ \h -> mLiftIO h m
-- | Get the package root for the current package which is being compiled.
-- This can be set explicitly with the -package-root flag but is normally
@@ -811,7 +785,7 @@ runIO m = Q (qRunIO m)
-- change directory when compiling files but instead set the -package-root flag
-- appropriately.
getPackageRoot :: Q FilePath
-getPackageRoot = Q qGetPackageRoot
+getPackageRoot = Q mGetPackageRoot
-- | Record external directories that runIO is using (dependent upon).
-- The compiler can then recognize that it should re-compile the Haskell file
@@ -830,7 +804,7 @@ getPackageRoot = Q qGetPackageRoot
-- * The state of the directory is read at the interface generation time,
-- not at the time of the function call.
addDependentDirectory :: FilePath -> Q ()
-addDependentDirectory dp = Q (qAddDependentDirectory dp)
+addDependentDirectory dp = Q $ \h -> mAddDependentDirectory h dp
-- | Record external files that runIO is using (dependent upon).
-- The compiler can then recognize that it should re-compile the Haskell file
@@ -844,17 +818,17 @@ addDependentDirectory dp = Q (qAddDependentDirectory dp)
--
-- * The dependency is based on file content, not a modification time
addDependentFile :: FilePath -> Q ()
-addDependentFile fp = Q (qAddDependentFile fp)
+addDependentFile fp = Q $ \h -> mAddDependentFile h fp
-- | Obtain a temporary file path with the given suffix. The compiler will
-- delete this file after compilation.
addTempFile :: String -> Q FilePath
-addTempFile suffix = Q (qAddTempFile suffix)
+addTempFile suffix = Q $ \h -> mAddTempFile h suffix
-- | Add additional top-level declarations. The added declarations will be type
-- checked along with the current declaration group.
addTopDecls :: [Dec] -> Q ()
-addTopDecls ds = Q (qAddTopDecls ds)
+addTopDecls ds = Q $ \h -> mAddTopDecls h ds
-- | Same as 'addForeignSource', but expects to receive a path pointing to the
-- foreign file instead of a 'String' of its contents. Consider using this in
@@ -863,7 +837,7 @@ addTopDecls ds = Q (qAddTopDecls ds)
-- This is a good alternative to 'addForeignSource' when you are trying to
-- directly link in an object file.
addForeignFilePath :: ForeignSrcLang -> FilePath -> Q ()
-addForeignFilePath lang fp = Q (qAddForeignFilePath lang fp)
+addForeignFilePath lang fp = Q $ \h -> mAddForeignFilePath h lang fp
-- | Add a finalizer that will run in the Q monad after the current module has
-- been type checked. This only makes sense when run within a top-level splice.
@@ -872,7 +846,7 @@ addForeignFilePath lang fp = Q (qAddForeignFilePath lang fp)
-- 'reify' is able to find the local definitions when executed inside the
-- finalizer.
addModFinalizer :: Q () -> Q ()
-addModFinalizer act = Q (qAddModFinalizer (unQ act))
+addModFinalizer act = Q $ \h -> mAddModFinalizer h act
-- | Adds a core plugin to the compilation pipeline.
--
@@ -882,7 +856,7 @@ addModFinalizer act = Q (qAddModFinalizer (unQ act))
-- to tell the compiler that we needed to compile first a plugin module in the
-- current package.
addCorePlugin :: String -> Q ()
-addCorePlugin plugin = Q (qAddCorePlugin plugin)
+addCorePlugin plugin = Q $ \h -> mAddCorePlugin h plugin
-- | Get state from the 'Q' monad. The state maintained by 'Q' is isomorphic to
-- a type-indexed finite map. That is,
@@ -896,20 +870,20 @@ addCorePlugin plugin = Q (qAddCorePlugin plugin)
-- Note that the state is local to the Haskell module in which the Template
-- Haskell expression is executed.
getQ :: Typeable a => Q (Maybe a)
-getQ = Q qGetQ
+getQ = Q mGetQ
-- | Replace the state in the 'Q' monad. Note that the state is local to the
-- Haskell module in which the Template Haskell expression is executed.
putQ :: Typeable a => a -> Q ()
-putQ x = Q (qPutQ x)
+putQ x = Q $ \h -> mPutQ h x
-- | Determine whether the given language extension is enabled in the 'Q' monad.
isExtEnabled :: Extension -> Q Bool
-isExtEnabled ext = Q (qIsExtEnabled ext)
+isExtEnabled ext = Q $ \h -> mIsExtEnabled h ext
-- | List all enabled language extensions.
extsEnabled :: Q [Extension]
-extsEnabled = Q qExtsEnabled
+extsEnabled = Q mExtsEnabled
-- | Add Haddock documentation to the specified location. This will overwrite
-- any documentation at the location if it already exists. This will reify the
@@ -928,48 +902,18 @@ extsEnabled = Q qExtsEnabled
-- Adding documentation to anything outside of the current module will cause an
-- error.
putDoc :: DocLoc -> String -> Q ()
-putDoc t s = Q (qPutDoc t s)
+putDoc t s = Q $ \h -> mPutDoc h t s
-- | Retrieves the Haddock documentation at the specified location, if one
-- exists.
-- It can be used to read documentation on things defined outside of the current
-- module, provided that those modules were compiled with the @-haddock@ flag.
getDoc :: DocLoc -> Q (Maybe String)
-getDoc n = Q (qGetDoc n)
+getDoc n = Q $ \h -> mGetDoc h n
instance MonadIO Q where
liftIO = runIO
-instance Quasi Q where
- qNewName = newName
- qReport = report
- qRecover = recover
- qReify = reify
- qReifyFixity = reifyFixity
- qReifyType = reifyType
- qReifyInstances = reifyInstances
- qReifyRoles = reifyRoles
- qReifyAnnotations = reifyAnnotations
- qReifyModule = reifyModule
- qReifyConStrictness = reifyConStrictness
- qLookupName = lookupName
- qLocation = location
- qGetPackageRoot = getPackageRoot
- qAddDependentFile = addDependentFile
- qAddDependentDirectory = addDependentDirectory
- qAddTempFile = addTempFile
- qAddTopDecls = addTopDecls
- qAddForeignFilePath = addForeignFilePath
- qAddModFinalizer = addModFinalizer
- qAddCorePlugin = addCorePlugin
- qGetQ = getQ
- qPutQ = putQ
- qIsExtEnabled = isExtEnabled
- qExtsEnabled = extsEnabled
- qPutDoc = putDoc
- qGetDoc = getDoc
-
-
----------------------------------------------------
-- The following operations are used solely in GHC.HsToCore.Quote when
-- desugaring brackets. They are not necessary for the user, who can use
=====================================
libraries/ghci/GHCi/TH.hs
=====================================
@@ -1,5 +1,5 @@
{-# LANGUAGE ScopedTypeVariables, StandaloneDeriving, DeriveGeneric,
- TupleSections, RecordWildCards, InstanceSigs, CPP #-}
+ TupleSections, RecordWildCards, InstanceSigs, CPP, RankNTypes #-}
{-# OPTIONS_GHC -fno-warn-name-shadowing #-}
-- |
@@ -164,58 +164,70 @@ ghcCmd m = GHCiQ $ \sRef -> do
instance MonadIO GHCiQ where
liftIO m = GHCiQ $ \_ -> m
-instance TH.Quasi GHCiQ where
- qNewName str = ghcCmd (NewName str)
- qReport isError msg = ghcCmd (Report isError msg)
-
- -- See Note [TH recover with -fexternal-interpreter] in GHC.Tc.Gen.Splice
- qRecover (GHCiQ h) a = GHCiQ $ \sRef -> mask $ \unmask -> do
- s <- readIORef sRef
- remoteTHCall (qsPipe s) StartRecover
- e <- try $ unmask $ runGHCiQ (a <* ghcCmd FailIfErrs) sRef
- remoteTHCall (qsPipe s) (EndRecover (isLeft e))
- case e of
- Left GHCiQException{} -> h sRef
- Right r -> return r
- qLookupName isType occ = ghcCmd (LookupName isType occ)
- qReify name = ghcCmd (Reify name)
- qReifyFixity name = ghcCmd (ReifyFixity name)
- qReifyType name = ghcCmd (ReifyType name)
- qReifyInstances name tys = ghcCmd (ReifyInstances name tys)
- qReifyRoles name = ghcCmd (ReifyRoles name)
-
-- To reify annotations, we send GHC the AnnLookup and also the
-- TypeRep of the thing we're looking for, to avoid needing to
-- serialize irrelevant annotations.
- qReifyAnnotations :: forall a . Data a => TH.AnnLookup -> GHCiQ [a]
- qReifyAnnotations lookup =
+reifyAnnotations :: forall a . Data a => TH.AnnLookup -> GHCiQ [a]
+reifyAnnotations lookup =
map (deserializeWithData . B.unpack) <$>
ghcCmd (ReifyAnnotations lookup typerep)
where typerep = typeOf (undefined :: a)
- qReifyModule m = ghcCmd (ReifyModule m)
- qReifyConStrictness name = ghcCmd (ReifyConStrictness name)
- qLocation = fromMaybe noLoc . qsLocation <$> getState
- qGetPackageRoot = ghcCmd GetPackageRoot
- qAddDependentFile file = ghcCmd (AddDependentFile file)
- qAddDependentDirectory dir = ghcCmd (AddDependentDirectory dir)
- qAddTempFile suffix = ghcCmd (AddTempFile suffix)
- qAddTopDecls decls = ghcCmd (AddTopDecls decls)
- qAddForeignFilePath lang fp = ghcCmd (AddForeignFilePath lang fp)
- qAddModFinalizer fin = GHCiQ (\_ -> mkRemoteRef fin) >>=
+runQinGHCiQ :: TH.Q a -> GHCiQ a
+runQinGHCiQ (TH.Q m) = GHCiQ $ \sRef -> m (metaHandlersGHCiQ (runInIO sRef))
+ where
+ runInIO :: IORef QState -> GHCiQ a -> IO a
+ runInIO sRef (GHCiQ m) = m sRef
+
+metaHandlersGHCiQ :: (forall x. GHCiQ x -> IO x) -> TH.MetaHandlers
+metaHandlersGHCiQ runInIO = TH.MetaHandlers {
+ mLiftIO = id
+ , mFail = runInIO . fail
+ , mNewName = \str -> runInIO $ ghcCmd (NewName str)
+ , mReport = \isError msg -> runInIO $ ghcCmd (Report isError msg)
+
+ -- See Note [TH recover with -fexternal-interpreter] in GHC.Tc.Gen.Splice
+ , mRecover = \h a -> runInIO $ GHCiQ $ \sRef -> mask $ \unmask -> do
+ s <- readIORef sRef
+ remoteTHCall (qsPipe s) StartRecover
+ e <- try $ unmask $ runGHCiQ (runQinGHCiQ a <* ghcCmd FailIfErrs) sRef
+ remoteTHCall (qsPipe s) (EndRecover (isLeft e))
+ case e of
+ Left GHCiQException{} ->
+ runGHCiQ (runQinGHCiQ h) sRef
+ Right r -> return r
+ , mLookupName = \isType occ -> runInIO $ ghcCmd (LookupName isType occ)
+ , mReify = \name ->runInIO $ ghcCmd (Reify name)
+ , mReifyFixity = \name ->runInIO $ ghcCmd (ReifyFixity name)
+ , mReifyType = \name -> runInIO $ ghcCmd (ReifyType name)
+ , mReifyInstances = \name tys -> runInIO $ ghcCmd (ReifyInstances name tys)
+ , mReifyRoles = \name -> runInIO $ ghcCmd (ReifyRoles name)
+
+ , mReifyAnnotations = runInIO . reifyAnnotations
+ , mReifyModule = \m -> runInIO $ ghcCmd (ReifyModule m)
+ , mReifyConStrictness = \name -> runInIO $ ghcCmd (ReifyConStrictness name)
+ , mLocation = runInIO $ fromMaybe noLoc . qsLocation <$> getState
+ , mGetPackageRoot = runInIO $ ghcCmd GetPackageRoot
+ , mAddDependentFile = \file -> runInIO $ ghcCmd (AddDependentFile file)
+ , mAddDependentDirectory = \dir -> runInIO $ ghcCmd (AddDependentDirectory dir)
+ , mAddTempFile = \suffix -> runInIO $ ghcCmd (AddTempFile suffix)
+ , mAddTopDecls = \decls -> runInIO $ ghcCmd (AddTopDecls decls)
+ , mAddForeignFilePath = \lang fp -> runInIO $ ghcCmd (AddForeignFilePath lang fp)
+ , mAddModFinalizer = \fin -> runInIO $ GHCiQ (\_ -> mkRemoteRef fin) >>=
ghcCmd . AddModFinalizer
- qAddCorePlugin str = ghcCmd (AddCorePlugin str)
- qGetQ = do
+ , mAddCorePlugin = \str -> runInIO $ ghcCmd (AddCorePlugin str)
+ , mGetQ = runInIO $ do
s <- getState
let lookup :: forall a. Typeable a => Map TypeRep Dynamic -> Maybe a
lookup m = fromDynamic =<< M.lookup (typeOf (undefined::a)) m
return $ lookup (qsMap s)
- qPutQ k = GHCiQ $ \sRef ->
- modifyIORef' sRef (\s -> s { qsMap = M.insert (typeOf k) (toDyn k) (qsMap s) })
- qIsExtEnabled x = ghcCmd (IsExtEnabled x)
- qExtsEnabled = ghcCmd ExtsEnabled
- qPutDoc l s = ghcCmd (PutDoc l s)
- qGetDoc l = ghcCmd (GetDoc l)
+ , mPutQ = \k -> runInIO $ GHCiQ $ \sRef ->
+ modifyIORef' sRef (\s -> s { qsMap = M.insert (typeOf k) (toDyn k) (qsMap s) })
+ , mIsExtEnabled = \x -> runInIO $ ghcCmd (IsExtEnabled x)
+ , mExtsEnabled = runInIO $ ghcCmd ExtsEnabled
+ , mPutDoc = \l s -> runInIO $ ghcCmd (PutDoc l s)
+ , mGetDoc = \l -> runInIO $ ghcCmd (GetDoc l)
+}
-- | The implementation of the 'StartTH' message: create
-- a new IORef QState, and return a RemoteRef to it.
@@ -235,7 +247,7 @@ runModFinalizerRefs pipe rstate qrefs = do
qstateref <- localRef rstate
qstate <- readIORef qstateref
qstate' <- newIORef $ qstate { qsPipe = pipe }
- _ <- runGHCiQ (TH.runQ $ sequence_ qs) qstate'
+ _ <- runGHCiQ (runQinGHCiQ $ sequence_ qs) qstate'
return ()
-- | The implementation of the 'RunTH' message
@@ -272,5 +284,5 @@ runTHQ
runTHQ pipe rstate mb_loc ghciq = do
qstateref <- localRef rstate
modifyIORef' qstateref (\qstate -> qstate { qsLocation = mb_loc, qsPipe = pipe })
- r <- runGHCiQ (TH.runQ ghciq) qstateref
+ r <- runGHCiQ (runQinGHCiQ ghciq) qstateref
return $! LB.toStrict (runPut (put r))
=====================================
libraries/template-haskell/Language/Haskell/TH/Syntax.hs
=====================================
@@ -5,13 +5,17 @@
{-# LANGUAGE TemplateHaskellQuotes #-}
{-# LANGUAGE Trustworthy #-}
{-# LANGUAGE UnboxedTuples #-}
+-- Don't warn for using 'report' from ghc-internal
+{-# OPTIONS_GHC -Wno-warnings-deprecations #-}
module Language.Haskell.TH.Syntax (
Quote (..),
Exp (..),
Match (..),
Clause (..),
- Q (..),
+ Q,
+ -- backwards compatibility
+ Language.Haskell.TH.Syntax.unQ,
Pat (..),
Stmt (..),
Con (..),
@@ -202,11 +206,14 @@ where
import GHC.Boot.TH.Lift
import GHC.Boot.TH.Syntax
-import GHC.Boot.TH.Monad
+import GHC.Boot.TH.Monad hiding (report)
+import qualified GHC.Boot.TH.Monad as Internal
import System.FilePath
import Data.Data hiding (Fixity(..))
import Data.List.NonEmpty (NonEmpty(..))
import GHC.Lexeme ( startsVarSym, startsVarId )
+import Control.Monad.IO.Class (MonadIO, liftIO)
+import System.IO (hPutStrLn, stderr)
-- This module completely re-exports 'GHC.Boot.TH.Syntax',
-- and exports additionally functions that depend on @filepath@ or @System.IO@.
@@ -499,3 +506,170 @@ reassociate the tree as necessary.
-- Subsumed by the more general 'SpecialiseEP' constructor.
pattern SpecialiseP :: Name -> Type -> (Maybe Inline) -> Phases -> Pragma
pattern SpecialiseP nm ty inl phases = SpecialiseEP Nothing [] (SigE (VarE nm) ty) inl phases
+
+unQ :: Q a -> (forall m. Quasi m => m a)
+unQ m = runQ m
+
+-----------------------------------------------------
+--
+-- The Quasi class
+--
+-----------------------------------------------------
+
+class (MonadIO m, MonadFail m) => Quasi m where
+ qRunQ :: Q a -> m a
+ -- | Fresh names. See 'newName'.
+ qNewName :: String -> m Name
+ qNewName = qRunQ . newName
+
+ ------- Error reporting and recovery -------
+ -- | Report an error (True) or warning (False)
+ -- ...but carry on; use 'fail' to stop. See 'report'.
+ qReport :: Bool -> String -> m ()
+ qReport b s = qRunQ $ report b s
+
+ -- | See 'recover'.
+ qRecover :: m a -- ^ the error handler
+ -> m a -- ^ action which may fail
+ -> m a -- ^ Recover from the monadic 'fail'
+
+ ------- Inspect the type-checker's environment -------
+ -- | True <=> type namespace, False <=> value namespace. See 'lookupName'.
+ qLookupName :: Bool -> String -> m (Maybe Name)
+ qLookupName ns s = qRunQ $ lookupName ns s
+ -- | See 'reify'.
+ qReify :: Name -> m Info
+ qReify v = qRunQ $ reify v
+ -- | See 'reifyFixity'.
+ qReifyFixity :: Name -> m (Maybe Fixity)
+ qReifyFixity v = qRunQ $ reifyFixity v
+ -- | See 'reifyType'.
+ qReifyType :: Name -> m Type
+ qReifyType v = qRunQ $ reifyType v
+ -- | Is (n tys) an instance? Returns list of matching instance Decs (with
+ -- empty sub-Decs) Works for classes and type functions. See 'reifyInstances'.
+ qReifyInstances :: Name -> [Type] -> m [Dec]
+ qReifyInstances cls tys = qRunQ $ reifyInstances cls tys
+ -- | See 'reifyRoles'.
+ qReifyRoles :: Name -> m [Role]
+ qReifyRoles nm = qRunQ $ reifyRoles nm
+ -- | See 'reifyAnnotations'.
+ qReifyAnnotations :: Data a => AnnLookup -> m [a]
+ qReifyAnnotations an = qRunQ $ reifyAnnotations an
+ -- | See 'reifyModule'.
+ qReifyModule :: Module -> m ModuleInfo
+ qReifyModule m = qRunQ $ reifyModule m
+ -- | See 'reifyConStrictness'.
+ qReifyConStrictness :: Name -> m [DecidedStrictness]
+ qReifyConStrictness nm = qRunQ $ qReifyConStrictness nm
+
+ -- | See 'location'.
+ qLocation :: m Loc
+ qLocation = qRunQ location
+
+ -- | Input/output (dangerous). See 'runIO'.
+ qRunIO :: IO a -> m a
+ qRunIO = liftIO
+ -- | See 'getPackageRoot'.
+ qGetPackageRoot :: m FilePath
+ qGetPackageRoot = qRunQ getPackageRoot
+
+ -- | See 'addDependentFile'.
+ qAddDependentFile :: FilePath -> m ()
+ qAddDependentFile p = qRunQ $ qAddDependentFile p
+
+ -- | See 'addDependentDirectory'.
+ qAddDependentDirectory :: FilePath -> m ()
+ qAddDependentDirectory p = qRunQ $ qAddDependentDirectory p
+
+ -- | See 'addTempFile'.
+ qAddTempFile :: String -> m FilePath
+ qAddTempFile p = qRunQ $ qAddTempFile p
+
+ -- | See 'addTopDecls'.
+ qAddTopDecls :: [Dec] -> m ()
+ qAddTopDecls decls = qRunQ $ qAddTopDecls decls
+
+ -- | See 'addForeignFilePath'.
+ qAddForeignFilePath :: ForeignSrcLang -> String -> m ()
+ qAddForeignFilePath lang fp = qRunQ $ addForeignFilePath lang fp
+
+ -- | See 'addModFinalizer'.
+ qAddModFinalizer :: Q () -> m ()
+ qAddModFinalizer fin = qRunQ $ addModFinalizer fin
+
+ -- | See 'addCorePlugin'.
+ qAddCorePlugin :: String -> m ()
+ qAddCorePlugin nm = qRunQ $ addCorePlugin nm
+
+ -- | See 'getQ'.
+ qGetQ :: Typeable a => m (Maybe a)
+ qGetQ = qRunQ getQ
+
+ -- | See 'putQ'.
+ qPutQ :: Typeable a => a -> m ()
+ qPutQ x = qRunQ $ putQ x
+
+ -- | See 'isExtEnabled'.
+ qIsExtEnabled :: Extension -> m Bool
+ qIsExtEnabled ext = qRunQ $ isExtEnabled ext
+ -- | See 'extsEnabled'.
+ qExtsEnabled :: m [Extension]
+ qExtsEnabled = qRunQ extsEnabled
+
+ -- | See 'putDoc'.
+ qPutDoc :: DocLoc -> String -> m ()
+ qPutDoc l s = qRunQ $ putDoc l s
+ -- | See 'getDoc'.
+ qGetDoc :: DocLoc -> m (Maybe String)
+ qGetDoc l = qRunQ $ getDoc l
+
+-- | \"Runs\" the 'Q' monad. Normal users of Template Haskell
+-- should not need this function, as the splice brackets @$( ... )@
+-- are the usual way of running a 'Q' computation.
+--
+-- This function is primarily used in GHC internals, and for debugging
+-- splices by running them in 'IO'.
+--
+-- Note that many functions in 'Q', such as 'reify' and other compiler
+-- queries, are not supported when running 'Q' in 'IO'; these operations
+-- simply fail at runtime. Indeed, the only operations guaranteed to succeed
+-- are 'newName', 'runIO', 'reportError' and 'reportWarning'.
+runQ :: Quasi m => Q a -> m a
+runQ = qRunQ
+
+-----------------------------------------------------
+-- The IO instance of Quasi
+-----------------------------------------------------
+
+-- | This instance is used only when running a Q
+-- computation in the IO monad, usually just to
+-- print the result. There is no interesting
+-- type environment, so reification isn't going to
+-- work.
+instance Quasi IO where
+ qRunQ (Q m) = m metaHandlersIO
+ qNewName = newNameIO
+
+ qReport True msg = hPutStrLn stderr ("Template Haskell error: " ++ msg)
+ qReport False msg = hPutStrLn stderr ("Template Haskell error: " ++ msg)
+ qRecover _ _ = badIO "recover" -- Maybe we could fix this?
+
+instance Quasi Q where
+ qRunQ = id
+ qRecover = recover
+
+
+-- | Report an error (True) or warning (False),
+-- but carry on; use 'fail' to stop.
+report :: Bool -> String -> Q ()
+report = Internal.report
+{-# DEPRECATED report "Use reportError or reportWarning instead" #-} -- deprecated in 7.6
+
+-- | Report an error to the user, but allow the current splice's computation to carry on. To abort the computation, use 'fail'.
+reportError :: String -> Q ()
+reportError = report True
+
+-- | Report a warning to the user, and carry on.
+reportWarning :: String -> Q ()
+reportWarning = report False
=====================================
testsuite/tests/interface-stability/template-haskell-exports.stdout
=====================================
@@ -354,7 +354,6 @@ module Language.Haskell.TH where
type Pred = Type
type PredQ :: *
type PredQ = Q Pred
- type role Q nominal
type Q :: * -> *
newtype Q a = ...
type Quote :: (* -> *) -> Constraint
@@ -655,7 +654,7 @@ module Language.Haskell.TH where
roleAnnotD :: forall (m :: * -> *). Quote m => Name -> [GHC.Internal.TH.Lib.Role] -> m Dec
ruleVar :: forall (m :: * -> *). Quote m => Name -> m RuleBndr
runIO :: forall a. GHC.Internal.Types.IO a -> Q a
- runQ :: forall (m :: * -> *) a. GHC.Internal.TH.Monad.Quasi m => Q a -> m a
+ runQ :: forall (m :: * -> *) a. Language.Haskell.TH.Syntax.Quasi m => Q a -> m a
safe :: Safety
sectionL :: forall (m :: * -> *). Quote m => m Exp -> m Exp -> m Exp
sectionR :: forall (m :: * -> *). Quote m => m Exp -> m Exp -> m Exp
@@ -1703,11 +1702,11 @@ module Language.Haskell.TH.Syntax where
data Pragma = InlineP Name Inline RuleMatch Phases | OpaqueP Name | SpecialiseEP (GHC.Internal.Maybe.Maybe [TyVarBndr ()]) [RuleBndr] Exp (GHC.Internal.Maybe.Maybe Inline) Phases | SpecialiseInstP Type | RuleP GHC.Internal.Base.String (GHC.Internal.Maybe.Maybe [TyVarBndr ()]) [RuleBndr] Exp Exp Phases | AnnP AnnTarget Exp | LineP GHC.Internal.Types.Int GHC.Internal.Base.String | CompleteP [Name] (GHC.Internal.Maybe.Maybe Name) | SCCP Name (GHC.Internal.Maybe.Maybe GHC.Internal.Base.String)
type Pred :: *
type Pred = Type
- type role Q nominal
type Q :: * -> *
- newtype Q a = Q {unQ :: forall (m :: * -> *). Quasi m => m a}
+ newtype Q a = ...
type Quasi :: (* -> *) -> Constraint
class (GHC.Internal.Control.Monad.IO.Class.MonadIO m, GHC.Internal.Control.Monad.Fail.MonadFail m) => Quasi m where
+ qRunQ :: forall a. Q a -> m a
qNewName :: GHC.Internal.Base.String -> m Name
qReport :: GHC.Internal.Types.Bool -> GHC.Internal.Base.String -> m ()
qRecover :: forall a. m a -> m a -> m a
@@ -1730,13 +1729,13 @@ module Language.Haskell.TH.Syntax where
qAddForeignFilePath :: ForeignSrcLang -> GHC.Internal.Base.String -> m ()
qAddModFinalizer :: Q () -> m ()
qAddCorePlugin :: GHC.Internal.Base.String -> m ()
- qGetQ :: forall a. ghc-internal-9.1500.0:GHC.Internal.Data.Typeable.Internal.Typeable a => m (GHC.Internal.Maybe.Maybe a)
- qPutQ :: forall a. ghc-internal-9.1500.0:GHC.Internal.Data.Typeable.Internal.Typeable a => a -> m ()
+ qGetQ :: forall a. ghc-internal-10.100.0:GHC.Internal.Data.Typeable.Internal.Typeable a => m (GHC.Internal.Maybe.Maybe a)
+ qPutQ :: forall a. ghc-internal-10.100.0:GHC.Internal.Data.Typeable.Internal.Typeable a => a -> m ()
qIsExtEnabled :: Extension -> m GHC.Internal.Types.Bool
qExtsEnabled :: m [Extension]
qPutDoc :: DocLoc -> GHC.Internal.Base.String -> m ()
qGetDoc :: DocLoc -> m (GHC.Internal.Maybe.Maybe GHC.Internal.Base.String)
- {-# MINIMAL qNewName, qReport, qRecover, qLookupName, qReify, qReifyFixity, qReifyType, qReifyInstances, qReifyRoles, qReifyAnnotations, qReifyModule, qReifyConStrictness, qLocation, qGetPackageRoot, qAddDependentFile, qAddDependentDirectory, qAddTempFile, qAddTopDecls, qAddForeignFilePath, qAddModFinalizer, qAddCorePlugin, qGetQ, qPutQ, qIsExtEnabled, qExtsEnabled, qPutDoc, qGetDoc #-}
+ {-# MINIMAL qRunQ, qRecover #-}
type Quote :: (* -> *) -> Constraint
class GHC.Internal.Base.Monad m => Quote m where
newName :: GHC.Internal.Base.String -> m Name
@@ -1814,7 +1813,7 @@ module Language.Haskell.TH.Syntax where
falseName :: Name
getDoc :: DocLoc -> Q (GHC.Internal.Maybe.Maybe GHC.Internal.Base.String)
getPackageRoot :: Q GHC.Internal.IO.FilePath
- getQ :: forall a. ghc-internal-9.1500.0:GHC.Internal.Data.Typeable.Internal.Typeable a => Q (GHC.Internal.Maybe.Maybe a)
+ getQ :: forall a. ghc-internal-10.100.0:GHC.Internal.Data.Typeable.Internal.Typeable a => Q (GHC.Internal.Maybe.Maybe a)
get_cons_names :: Con -> [Name]
hoistCode :: forall (m :: * -> *) (n :: * -> *) (r :: GHC.Internal.Types.RuntimeRep) (a :: TYPE r). GHC.Internal.Base.Monad m => (forall x. m x -> n x) -> Code m a -> Code n a
isExtEnabled :: Extension -> Q GHC.Internal.Types.Bool
@@ -1861,7 +1860,7 @@ module Language.Haskell.TH.Syntax where
oneName :: Name
pkgString :: PkgName -> GHC.Internal.Base.String
putDoc :: DocLoc -> GHC.Internal.Base.String -> Q ()
- putQ :: forall a. ghc-internal-9.1500.0:GHC.Internal.Data.Typeable.Internal.Typeable a => a -> Q ()
+ putQ :: forall a. ghc-internal-10.100.0:GHC.Internal.Data.Typeable.Internal.Typeable a => a -> Q ()
recover :: forall a. Q a -> Q a -> Q a
reify :: Name -> Q Info
reifyAnnotations :: forall a. GHC.Internal.Data.Data.Data a => AnnLookup -> Q [a]
@@ -1884,6 +1883,7 @@ module Language.Haskell.TH.Syntax where
trueName :: Name
tupleDataName :: GHC.Internal.Types.Int -> Name
tupleTypeName :: GHC.Internal.Types.Int -> Name
+ unQ :: forall a. Q a -> forall (m :: * -> *). Quasi m => m a
unTypeCode :: forall (r :: GHC.Internal.Types.RuntimeRep) (a :: TYPE r) (m :: * -> *). Quote m => Code m a -> m Exp
unTypeQ :: forall (r :: GHC.Internal.Types.RuntimeRep) (a :: TYPE r) (m :: * -> *). Quote m => m (TExp a) -> m Exp
unboxedSumDataName :: SumAlt -> SumArity -> Name
@@ -2289,10 +2289,10 @@ instance forall a b c d e f g. (GHC.Internal.TH.Lift.Lift a, GHC.Internal.TH.Lif
instance GHC.Internal.TH.Lift.Lift (# #) -- Defined in ‘GHC.Internal.TH.Lift’
instance GHC.Internal.TH.Lift.Lift GHC.Internal.Prim.Char# -- Defined in ‘GHC.Internal.TH.Lift’
instance GHC.Internal.TH.Lift.Lift GHC.Internal.Prim.Word# -- Defined in ‘GHC.Internal.TH.Lift’
-instance GHC.Internal.TH.Monad.Quasi GHC.Internal.Types.IO -- Defined in ‘GHC.Internal.TH.Monad’
-instance GHC.Internal.TH.Monad.Quasi GHC.Internal.TH.Monad.Q -- Defined in ‘GHC.Internal.TH.Monad’
instance GHC.Internal.TH.Monad.Quote GHC.Internal.Types.IO -- Defined in ‘GHC.Internal.TH.Monad’
instance GHC.Internal.TH.Monad.Quote GHC.Internal.TH.Monad.Q -- Defined in ‘GHC.Internal.TH.Monad’
instance [safe] Language.Haskell.TH.Lib.DefaultBndrFlag GHC.Internal.TH.Syntax.BndrVis -- Defined in ‘Language.Haskell.TH.Lib’
instance [safe] Language.Haskell.TH.Lib.DefaultBndrFlag GHC.Internal.TH.Syntax.Specificity -- Defined in ‘Language.Haskell.TH.Lib’
instance [safe] Language.Haskell.TH.Lib.DefaultBndrFlag () -- Defined in ‘Language.Haskell.TH.Lib’
+instance Language.Haskell.TH.Syntax.Quasi GHC.Internal.Types.IO -- Defined in ‘Language.Haskell.TH.Syntax’
+instance Language.Haskell.TH.Syntax.Quasi GHC.Internal.TH.Monad.Q -- Defined in ‘Language.Haskell.TH.Syntax’
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d6f6f5c704c94d865b95cb73b2abba6…
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d6f6f5c704c94d865b95cb73b2abba6…
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[Git][ghc/ghc][wip/io-manager-deadlock-detection] 460 commits: Simplify the treatment of static forms
by Duncan Coutts (＠dcoutts) 18 Jun '26
by Duncan Coutts (＠dcoutts) 18 Jun '26
18 Jun '26
Duncan Coutts pushed to branch wip/io-manager-deadlock-detection at Glasgow Haskell Compiler / GHC
Commits:
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.
- - - - -
870243e4 by Zubin Duggal at 2026-03-12T17:33:28+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.
- - - - -
669d09f9 by Cheng Shao at 2026-03-13T15:06:07-04:00
hadrian: remove redundant library/rts ways definitions from stock flavours
This patch removes redundant library/rts ways definitions from stock
flavours in hadrian; they can be replaced by applying appropriate
filters on `defaultFlavour`.
- - - - -
a27dc081 by Teo Camarasu at 2026-03-13T15:06:51-04:00
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
- - - - -
6eef855b by Sylvain Henry at 2026-03-13T15:08:18-04:00
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
- - - - -
905f8723 by Simon Jakobi at 2026-03-13T15:09:09-04:00
Add regression test for #2057
Test that GHC stops after an interface-file error instead of
continuing into the linker.
The test constructs a stale package dependency on purpose. `pkgB` is compiled
against one version of package `A`, then the same unit id is replaced by an
incompatible build of `A`. When `Main` imports `B`, GHC has to read `B.hi`,
finds an unfolding that still mentions the old `A`, and should fail while
loading interfaces.
Closes #2057.
Assisted-by: Codex
- - - - -
a13245a9 by Sylvain Henry at 2026-03-13T15:10:06-04:00
JS: fix recompilation avoidance (#23013)
- we were checking the mtime of the *.jsexe directory, not of a file
- we were not computing the PkgsLoaded at all
- - - - -
07442653 by Cheng Shao at 2026-03-13T15:10:51-04:00
hadrian: bump index state & bootstrap plans
This patch bumps hadrian index state & bootstrap plans:
- The updated index state allows bootstrapping from 9.14 without cabal
allow-newer hacks
- The updated bootstrap plans all contain shake-0.19.9 containing
important bugfix, allowing a subsequent patch to bump shake bound to
ensure the bugfix is included
- ghc 9.14.1 bootstrap plan is added
- - - - -
fdc1dbad by Cheng Shao at 2026-03-13T15:10:51-04:00
ci: add ghc 9.14.1 to bootstrap matrix
This patch adds ghc 9.14.1 to bootstrap matrix, so that we test
bootstrapping from ghc 9.14.1.
- - - - -
91916079 by Sylvain Henry at 2026-03-13T15:11:43-04:00
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.
- - - - -
baa4ebb4 by Cheng Shao at 2026-03-13T15:12:26-04:00
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.
- - - - -
02e68a86 by Brandon Simmons at 2026-03-13T15:13:19-04:00
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
- - - - -
a18fa3c1 by Cheng Shao at 2026-03-14T05:12:14-04:00
configure: make $LLVMAS default to $CC when $CcLlvmBackend is YES
This patch changes the $LLVMAS detection logic in configure so that
when it's not manually specified by the user, it defaults to $CC if
$CcLlvmBackend is YES. It's a more sensible default than auto-detected
clang from the environment, especially when cross-compiling, $CC as
the cross target's LLVM assembler is more compatible with the use case
than the system-wide clang. Fixes #26769.
- - - - -
3774086e by Matthew Pickering at 2026-03-14T05:13:00-04:00
exceptions: annotate onException continuation with WhileHandling
Before this patch, an exception thrown in the `onException` handler
would loose track of where the original exception was thrown.
```
import Control.Exception
main :: IO ()
main = failingAction `onException` failingCleanup
where
failingAction = throwIO (ErrorCall "outer failure")
failingCleanup = throwIO (ErrorCall "cleanup failure")
```
would report
```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
cleanup failure
HasCallStack backtrace:
throwIO, called at T28399.hs:<line>:<column> in <package-id>:Main
```
notice that the "outer failure" exception is not present in the error
message.
With this patch, any exception thrown is in the handler is annotated
with WhileHandling. The resulting message looks like
```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
cleanup failure
While handling outer failure
HasCallStack backtrace:
throwIO, called at T28399.hs:7:22 in main:Main
```
CLC Proposal: https://github.com/haskell/core-libraries-committee/issues/397
Fixes #26759
- - - - -
63ae8eb3 by Andreas Klebinger at 2026-03-14T05:13:43-04:00
Fix missing profiling header for origin_thunk frame.
Fixes #27007
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213d2c0e by Cheng Shao at 2026-03-14T05:14:28-04:00
ci: fix ci-images revision
The current ci-images revision was a commit on the WIP branch of
https://gitlab.haskell.org/ghc/ci-images/-/merge_requests/183, and
it's not on the current ci-images master branch. This patch fixes the
image revision to use the current tip of ci-images master.
- - - - -
fc2b083f by Andreas Klebinger at 2026-03-14T05:15:14-04:00
Revert "hadrian/build-cabal: Better respect and utilize -j"
This reverts commit eab3dbba79650e6046efca79133b4c0a5257613d.
While it's neat this currently isn't well supported on all platforms.
It's time will come, but for now I'm reverting this to avoid issues for
users on slightly unconvential platforms.
This will be tracked at #26977.
- - - - -
12a706cf by Cheng Shao at 2026-03-14T16:37:54-04:00
base: fix redundant imports in GHC.Internal.Weak.Finalize
This patch fixes redundant imports in GHC.Internal.Weak.Finalize that
causes a regression in bootstrapping head from 9.14 with validate
flavours. Fixes #27026.
- - - - -
b5d39cad by Matthew Pickering at 2026-03-14T16:38:37-04:00
Use explicit syntax rather than pure
- - - - -
43638643 by Andreas Klebinger at 2026-03-15T18:15:48-04:00
Configure: Fix check for --target support in stage0 CC
The check FP_PROG_CC_LINKER_TARGET used $CC unconditionally to check for
--target support. However this fails for the stage0 config where the C
compiler used is not $CC but $CC_STAGE0.
Since we already pass the compiler under test into the macro I simply
changed it to use that instead.
Fixes #26999
- - - - -
18fd0df6 by Simon Hengel at 2026-03-15T18:16:33-04:00
Fix typo in recursive_do.rst
- - - - -
86bd9bfc by fendor at 2026-03-17T23:46:09-04:00
Introduce `-fimport-loaded-targets` GHCi flag
This new flag automatically adds all loaded targets to the GHCi session
by adding an `InteractiveImport` for the loaded targets.
By default, this flag is disabled, as it potentially increases memory-usage.
This interacts with the flag `-fno-load-initial-targets` as follows:
* If no module is loaded, no module is added as an interactive import.
* If a reload loads up to a module, all loaded modules are added as
interactive imports.
* Unloading modules removes them from the interactive context.
Fixes #26866 by rendering the use of a `-ghci-script` to achieve the
same thing redundant.
- - - - -
e3d4c1bb by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Remove GHC.Internal.Data.Eq
It served no purpose other than being a re-export.
- - - - -
6f4f6cf0 by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Refine GHC.Internal.Base imports
Removed re-exports from GHC.Internal.Base. This reveals some modules
that don't actually use anything *defined* in GHC.Internal.Base, and
that can be pushed down a little in the import graph.
Replaced most imports of GHC.Internal.Base with non-wildcard imports
from modules where the identifiers are actually defined.
Part of #26834
Metric Decrease:
T5321FD
- - - - -
7fb51f54 by mangoiv at 2026-03-17T23:48:00-04:00
ci: clone, don't copy when creating the cabal cache
Also removed WINDOWS_HOST variable detected via uname - we now just
check whether the CI job has windows in its name. This works because we
only ever care about it if the respective job is not a cross job. We
also statically detect darwin cross jobs in the same way. We only ever have
darwin -> darwin cross jobs so this is enough to detect the host
reliably.
- - - - -
f8817879 by mangoiv at 2026-03-17T23:48:44-04:00
ci: mark size_hello_artifact fragile on darwin x86
The size of the x86_64 hello artifact is not stable which results in flaky testruns.
Resolves #26814
- - - - -
e34cb6da by Adam Gundry at 2026-03-20T12:20:00-04:00
ghci: Mention active language edition in startup banner
Per GHC proposal 632, this makes the GHCi startup banner include
the active language edition, plus an indication of whether this
was the default (as opposed to being explicitly selected via an
option such as `-XGHC2024`). For example:
```
$ ghci
GHCi, version 9.14.1: https://www.haskell.org/ghc/ :? for help
Using default language edition: GHC2024
ghci>
```
Fixes #26037.
- - - - -
52c3e6ba by sheaf at 2026-03-20T12:21:09-04:00
Improve incomplete record selector warnings
This commit stops GHC from emitting spurious incomplete record selector
warnings for bare selectors/projections such as .fld
There are two places we currently emit incomplete record selector
warnings:
1. In the desugarer, when we see a record selector or an occurrence
of 'getField'. Here, we can use pattern matching information to
ensure we don't give false positives.
2. In the typechecker, which might sometimes give false positives but
can emit warnings in cases that the pattern match checker would
otherwise miss.
This is explained in Note [Detecting incomplete record selectors]
in GHC.HsToCore.Pmc.
Now, we obviously don't want to emit the same error twice, and generally
we prefer (1), as those messages contain fewer false positives. So we
suppress (2) when we are sure we are going to emit (1); the logic for
doing so is in GHC.Tc.Instance.Class.warnIncompleteRecSel,
and works by looking at the CtOrigin.
Now, the issue was that this logic handled explicit record selectors as
well as overloaded record field selectors such as "x.r" (which turns
into a simple GetFieldOrigin CtOrigin), but it didn't properly handle
record projectors like ".fld" or ".fld1.fld2" (which result in other
CtOrigins such as 'RecordFieldProjectionOrigin').
To solve this problem, we re-use the 'isHasFieldOrigin' introduced in
fbdc623a (slightly adjusted).
On the way, we also had to update the desugarer with special handling
for the 'ExpandedThingTc' case in 'ds_app', to make sure that
'ds_app_var' sees all the type arguments to 'getField' in order for it
to indeed emit warnings like in (1).
Fixes #26686
- - - - -
309d7e87 by Cheng Shao at 2026-03-20T12:21:53-04:00
rts: opportunistically grow the MutableByteArray# in-place in resizeMutableByteArray#
Following !15234, this patch improves `resizeMutableByteArray#` memory
efficiency by growing the `MutableByteArray#` in-place if possible,
addressing an old todo comment here. Also adds a new test case
`resizeMutableByteArrayInPlace` that stresses this behavior.
- - - - -
7d4ef162 by Matthew Craven at 2026-03-20T12:22:47-04:00
Change representation of floating point literals
This commit changes the representation of floating point literals
throughough the compiler, in particular in Core and Cmm.
The Rational type is deficient for this purpose, dealing poorly
with NaN, +/-Infinity, and negative zero. Instead, the new module
GHC.Types.Literal.Floating uses the host Float/Double type to represent
NaNs, infinities and negative zero. It also contains a Rational
constructor, for the benefit of -fexcess-precision.
Other changes:
- Remove Note [negative zero] and related code
This also removes the restrictions on constant-folding of division
by zero, and should make any problems with NaN/Infinity more obvious.
- Use -0.0 as the additive identity for Core constant folding rules
for floating-point addition, fixing #21227.
- Manual worker-wrapper for GHC.Float.rationalToDouble. This is
intended to prevent the compiler's WW on this function from
interfering with constant-folding. This change means that we now
avoid allocating a box for the result of a 'realToFrac' call in
T10359.
- Combine floatDecodeOp and doubleDecodeOp.
This change also fixes a bug in doubleDecodeOp wherein it
would incorrectly produce an Int# instead of an Int64#
literal for the mantissa component with 64-bit targets.
- Use Float/Double for assembly immediates, and update the X86 and
PowerPC backends to properly handle special values such as NaN and
infinity.
- Allow 'rational_to' to handle zero denominators, fixing a
TODO in GHC.Core.Opt.ConstantFold.
Fixes #8364 #9811 #18897 #21227
Progress towards #26919
Metric Decrease:
T10359
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
-------------------------
Metric Decrease:
T1969
T5321FD
-------------------------
- - - - -
80e2dd4f by Zubin Duggal at 2026-03-20T12:23:33-04:00
compiler/ffi: Collapse void pointer chains in capi wrappers
New gcc/clang treat -Wincompatible-pointer-types as an error by
default. Since C only allows implicit conversion from void*, not void**,
capi wrappers for functions taking e.g. abstract** would fail to compile
when the Haskell type Ptr (Ptr Abstract) was naively translated to void**.
Collapse nested void pointers to a single void* when the pointee type
has no known C representation.
Fixes #26852
- - - - -
1c50bd7b by Luite Stegeman at 2026-03-20T12:24:37-04:00
Move some functions related to pointer tagging to a separate module
- - - - -
bfd7aafd by Luite Stegeman at 2026-03-20T12:24:37-04:00
Branchless unpacking for enumeration types
Change unpacking for enumeration types to go to Word8#/Word16#/Word#
directly instead of going through an intermediate unboxed sum. This
allows us to do a branchless conversion using DataToTag and TagToEnum.
Fixes #26970
- - - - -
72b20fc0 by Luite Stegeman at 2026-03-20T12:25:30-04:00
bytecode: Carefully SLIDE off the end of a stack chunk
The SLIDE bytecode instruction was not checking for stack chunk
boundaries and could corrupt the stack underflow frame, leading
to crashes.
We add a check to use safe writes if we cross the chunk boundary
and also handle stack underflow if Sp is advanced past the underflow
frame.
fix #27001
- - - - -
2e22b43c by Cheng Shao at 2026-03-20T12:26:14-04:00
ghci: serialize BCOByteArray buffer directly when possible
This patch changes the `Binary` instances of `BCOByteArray` to
directly serialize the underlying buffer when possible, while also
taking into account the issue of host-dependent `Word` width. See
added comments and amended `Note [BCOByteArray serialization]` for
detailed explanation. Closes #27020.
- - - - -
89d9ba37 by Sylvain Henry at 2026-03-20T12:27:34-04:00
JS: replace BigInt with Number arithmetic for 32/64-bit quot/rem (#23597)
Replace BigInt-based implementations of quotWord32, remWord32,
quotRemWord32, quotRem2Word32, quotWord64, remWord64, quotInt64, and
remInt64 with pure Number (double/integer) arithmetic to avoid the
overhead of BigInt promotion.
- - - - -
ae4ddd60 by Sylvain Henry at 2026-03-20T12:28:28-04:00
Core: add constant-folding rules for Addr# eq/ne (#18032)
- - - - -
3e767f98 by Matthew Pickering at 2026-03-20T12:29:11-04:00
Use OsPath rather than FilePath in Downsweep cache
This gets us one step closure to uniformly using `OsPath` in the
compiler.
- - - - -
2c57de29 by Cheng Shao at 2026-03-20T12:29:55-04:00
hadrian: fix ghc-in-ghci flavour stage0 shared libraries
This patch fixes missing stage0 shared libraries in hadrian
ghc-in-ghci flavour, which was accidentally dropped in
669d09f950a6e88b903d9fd8a7571531774d4d5d and resulted in a regression
in HLS support on linux/macos. Fixes #27057.
- - - - -
5b1be555 by Sylvain Henry at 2026-03-20T12:30:48-04:00
JS: install rts/Types.h header file (#27033)
It was an omission, making HsFFI.h not usable with GHC using the JS
backend.
- - - - -
b883f08f by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: don't compile RTS with -Winline
This patch removes `-Winline` from cflags when compiling the RTS,
given that:
1. It generates a huge pile of spam and hurts developer experience
2. Whether inlining happens is highly dependent on toolchains,
flavours, etc, and it's not really an issue to fix if inlining
doesn't happen; it's a hint to the C compiler anyway.
Fixes #27060.
- - - - -
333387d6 by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: compile libffi-clib with -Wno-deprecated-declarations
This patch adds `-Wno-deprecated-declarations` to cflags of
`libffi-clib`, given that it produces noise at compile-time that
aren't really our issue to fix anyway, it's from vendored libffi
source code.
- - - - -
67c47771 by Rodrigo Mesquita at 2026-03-20T12:32:17-04:00
Expose decodeStackWithIpe from ghc-experimental
This decoding is useful to the debugger and it wasn't originally
exported as an oversight.
- - - - -
18513365 by Matthew Pickering at 2026-03-21T04:43:26-04:00
Add support for custom external interpreter commands
It can be useful for GHC API clients to implement their own external
interpreter commands.
For example, the debugger may want an efficient way to inspect the
stacks of the running threads in the external interpreter.
- - - - -
4636d906 by mangoiv at 2026-03-21T04:44:10-04:00
ci: remove obsolete fallback for old debian and ubuntu versions
- - - - -
2e3a2805 by mangoiv at 2026-03-21T04:44:10-04:00
ci: drop ubuntu 18 and 20
Ubuntu 18 EOL: May 2023
Ubuntu 20 EOL: May 2025
We should probably not make another major release supporting these platforms.
Also updates the generator script.
Resolves #25876
- - - - -
de54e264 by Cheng Shao at 2026-03-21T17:52:08+01:00
rts: fix -Wcompare-distinct-pointer-types errors
This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS
which should have been caught by the `validate` flavour but was
warnings in CI due to the recent `+werror` regression.
- - - - -
b9bd73de by Cheng Shao at 2026-03-21T17:52:08+01:00
ghc-internal: fix unused imports
This commit fixes unused imports in `ghc-internal` which should have
been caught by the `validate` flavour but was warnings in CI due to
the recent `+werror` regression. Fixes #26987 #27059.
- - - - -
da946a16 by Cheng Shao at 2026-03-21T17:03:51+00:00
ghci: fix unused imports
This commit fixes unused imports in `ghci` which should have been
caught by the `validate` flavour but was warnings in CI due to the
recent `+werror` regression. Fixes #26987 #27059.
- - - - -
955b1cf8 by Cheng Shao at 2026-03-21T17:03:51+00:00
compiler: fix unused imports in GHC.Tc.Types.Origin
This commit fixes unused imports in `GHC.Tc.Types.Origin` which should
have been caught by the `validate` flavour but was warnings in CI due
to the recent `+werror` regression. Fixes #27059.
- - - - -
3b1aeb50 by Cheng Shao at 2026-03-21T17:03:51+00:00
hadrian: fix missing +werror in validate flavour
This patch fixes missing `+werror` in validate flavour, which was an
oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066.
- - - - -
44f118f0 by Cheng Shao at 2026-03-22T04:54:01-04:00
ci: bump CACHE_REV and add the missing reminder
This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI
errors due to stale cabal cache on some runners, and also adds a
reminder to remind future maintainers. Fixes #27075.
- - - - -
2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
Add 128-bit SIMD support to AArch64 NCG
Changes:
- Add `Format` field to vector-capable instructions.
These instructions will emit `vN.4s` (for example) as a operand.
- Additional constructors for `Operand`:
`OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example).
`OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example).
- Integer quot/rem are implemented in C, like x86.
Closes #26536
Metric Increase:
T3294
- - - - -
5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
AArch64 NCG: Improve code generation for floating-point and vector constants
Some floating-point constants can be directly encoded using the FMOV instruction.
Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI.
- - - - -
c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00
Add regression test for #13729
Closes #13729.
- - - - -
aa5dfe67 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Check that shift values are valid
In GHC's codebase in non-DEBUG builds we silently substitute shiftL/R
with unsafeShiftL/R for performance reasons. However we were not
checking that the shift value was valid for unsafeShiftL/R, leading to
wrong computations, but only in non-DEBUG builds.
This patch adds the necessary checks and reports an error when a wrong
shift value is passed.
- - - - -
c8a7b588 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Implement basic value range analysis (#25718)
Perform basic value range analysis to try to determine at compile time
the result of the application of some comparison primops (ltWord#, etc.).
This subsumes the built-in rewrite rules used previously to check if one
of the comparison argument was a bound (e.g. (x :: Word8) <= 255 is
always True). Our analysis is more powerful and handles type
conversions: e.g. word8ToWord x <= 255 is now detected as always True too.
We also use value range analysis to filter unreachable alternatives in
case-expressions. To support this, we had to allow case-expressions for
primitive types to not have a DEFAULT alternative (as was assumed before
and checked in Core lint).
- - - - -
a5ec467e by ARATA Mizuki at 2026-03-26T03:49:49-04:00
rts: Align stack to 64-byte boundary in StgRun on x86
When LLVM spills AVX/AVX-512 vector registers to the stack, it requires
32-byte (__m256) or 64-byte (__m512) alignment. If the stack is not
sufficiently aligned, LLVM inserts a realignment prologue that reserves
%rbp as a frame pointer, conflicting with GHC's use of %rbp as an STG
callee-saved register and breaking the tail-call-based calling convention.
Previously, GHC worked around this by lying to LLVM about the stack
alignment and rewriting aligned vector loads/stores (VMOVDQA, VMOVAPS)
to unaligned ones (VMOVDQU, VMOVUPS) in the LLVM Mangler. This had two
problems:
- It did not extend to AVX-512, which requires 64-byte alignment. (#26595)
- When Haskell calls a C function that takes __m256/__m512 arguments on
the stack, the callee requires genuine alignment, which could cause a
segfault. (#26822)
This patch genuinely aligns the stack to 64 bytes in StgRun by saving
the original stack pointer before alignment and restoring it in
StgReturn. We now unconditionally advertise 64-byte stack alignment to
LLVM for all x86 targets, making rewriteAVX in the LLVM Mangler
unnecessary. STG_RUN_STACK_FRAME_SIZE is increased from 48 to 56 bytes
on non-Windows x86-64 to store the saved stack pointer.
Closes #26595 and #26822
Co-Authored-By: Claude Opus 4.5 <noreply(a)anthropic.com>
- - - - -
661da815 by Teo Camarasu at 2026-03-26T03:50:33-04:00
ghc-internal: Float Generics to near top of module graph
We remove GHC.Internal.Generics from the critical path of the
`ghc-internal` module graph. GHC.Internal.Generics used to be in the
middle of the module graph, but now it is nearer the top (built later).
This change thins out the module graph and allows us to get rid of the
ByteOrder hs-boot file.
We implement this by moving Generics instances from the module where the
datatype is defined to the GHC.Internal.Generics module. This trades off
increasing the compiled size of GHC.Internal.Generics with reducing the
dependency footprint of datatype modules.
Not all instances are moved to GHC.Internal.Generics. For instance,
`GHC.Internal.Control.Monad.Fix` keeps its instance as it is one of the
very last modules compiled in `ghc-internal` and so inverting the
relationship here would risk adding GHC.Internal.Generics back onto the
critical path.
We also don't change modules that are re-exported from the `template-haskell` or `ghc-heap`.
This is done to make it easy to eventually move `Generics` to `base`
once something like #26657 is implemented.
Resolves #26930
Metric Decrease:
T21839c
- - - - -
45428f88 by sheaf at 2026-03-26T03:51:31-04:00
Avoid infinite loop in deep subsumption
This commit ensures we only unify after we recur in the deep subsumption
code in the FunTy vs non-FunTy case of GHC.Tc.Utils.Unify.tc_sub_type_deep,
to avoid falling into an infinite loop.
See the new Wrinkle [Avoiding a loop in tc_sub_type_deep] in
Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.
Fixes #26823
Co-authored-by: simonpj <simon.peytonjones(a)gmail.com>
- - - - -
2823b039 by Ian Duncan at 2026-03-26T03:52:21-04:00
AArch64: fix MOVK regUsageOfInstr to mark dst as both read and written
MOVK (move with keep) modifies only a 16-bit slice of the destination
register, so the destination is both read and written. The register
allocator must know this to avoid clobbering live values. Update
regUsageOfInstr to list the destination in both src and dst sets.
No regression test: triggering the misallocation requires specific
register pressure around a MOVK sequence, which is difficult to
reliably provoke from Haskell source.
- - - - -
57b7878d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12002
Closes #12002.
- - - - -
c8f9df2d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12046
Closes #12046.
Co-authored-by: Andreas Klebinger <klebinger.andreas(a)gmx.at>
- - - - -
615d72ac by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #13180
Closes #13180.
- - - - -
423eebcf by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11141
Closes #11141.
- - - - -
286849a4 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11505
Closes #11505.
- - - - -
7db149d9 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression perf test for #13820
Closes #13820.
- - - - -
e73c4adb by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #10381
Closes #10381.
- - - - -
5ebcfb57 by Benjamin Maurer at 2026-03-26T03:54:02-04:00
Generate assembly on x86 for word2float (#22252)
We used to emit C function call for MO_UF_Conv primitive.
Now emits direct assembly instead.
Co-Authored-By: Sylvain Henry <sylvain(a)haskus.fr>
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
- - - - -
5b550754 by Matthew Pickering at 2026-03-26T03:54:51-04:00
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
- - - - -
ef0a1bd2 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: adopt release tracking ticket from #16816
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a7f40fd9 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: add a release tracking ticket
Brings the information in the release tracking ticket up to date with
https://gitlab.haskell.org/ghc/ghc-hq/-/blob/main/release-management.mkd
Resolves #26691
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161d3285 by Teo Camarasu at 2026-03-26T03:56:18-04:00
Revert "Set default eventlog-flush-interval to 5s"
Flushing the eventlog forces a synchronisation of all the capabilities
and there was a worry that this might lead to a performance cost for
some highly parallel workloads.
This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2.
- - - - -
36eed985 by Cheng Shao at 2026-03-26T03:57:03-04:00
ghc-boot: move GHC.Data.SmallArray to ghc-boot
This commit moves `GHC.Data.SmallArray` from the `ghc` library to
`ghc-boot`, so that it can be used by `ghci` as well:
- The `Binary` (from `ghc`) instance of `SmallArray` is moved to
`GHC.Utils.Binary`
- Util functions `replicateSmallArrayIO`, `mapSmallArrayIO`,
`mapSmallArrayM_`, `imapSmallArrayM_` , `smallArrayFromList` and
`smallArrayToList` are added
- The `Show` instance is added
- The `Binary` (from `binary`) instance is added
- - - - -
fdf828ae by Cheng Shao at 2026-03-26T03:57:03-04:00
compiler: use `Binary` instance of `BCOByteArray` for bytecode objects
This commit defines `Binary` (from `compiler`) instance of
`BCOByteArray` which serializes the underlying buffer directly, and
uses it directly in bytecode object serialization. Previously we reuse
the `Binary` (from `binary`) instance, and this change allows us to
avoid double-copying via an intermediate `ByteString` when using
`put`/`get` in `binnary`. Also see added comment for explanation.
- - - - -
3bf62d0a by Cheng Shao at 2026-03-26T03:57:03-04:00
ghci: use SmallArray directly in ResolvedBCO
This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when
applicable, making the memory representation more compact and reducing
marshaling overhead. Closes #27058.
- - - - -
3d6492ce by Wen Kokke at 2026-03-26T03:57:53-04:00
Fix race condition between flushEventLog and start/endEventLogging.
This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving:
- `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`.
- `flushEventLog` flushes some events to `event_log_writer`.
- `startEventLogging` writes the eventlog header to `event_log_writer`.
This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header.
This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as:
```c
void flushEventLog(Capability **cap USED_IF_THREADS)
{
ACQUIRE_LOCK(&state_change_mutex);
flushEventLog_(cap);
RELEASE_LOCK(&state_change_mutex);
}
```
The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable.
I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours.
- - - - -
7b9a75f0 by Phil Hazelden at 2026-03-26T03:58:37-04:00
Fix build with werror on glibc 2.43.
We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same
values as defined in glibc prior to 2.43. But in 2.43, glibc changes
them to new values, which means we get a warning when redefining them.
By `#undef`ing them first, we no longer get a warning.
Closes #27076.
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fe6e76c5 by Tobias Haslop at 2026-03-26T03:59:30-04:00
Fix broken Haddock link to Bifunctor class in description of Functor class
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404b71c1 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Fix assert in Interpreter.c
If we skip exactly the number of words on the stack we end up on
the first word in the next chunk.
- - - - -
a85bd503 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Support arbitrary size unboxed tuples in bytecode
This stores the size (number of words on the stack) of the next
expected tuple in the TSO, ctoi_spill_size field, eliminating
the need of stg_ctoi_tN frames for each size.
Note: On 32 bit platform there is still a bytecode tuple size
limit of 255 words on the stack.
Fixes #26946
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e2209031 by Luite Stegeman at 2026-03-27T04:40:49-04:00
Add specialized frames for small tuples
Small tuples are now returned more efficiently to the interpreter.
They use one less word of stack space and don't need manipulation
of the TSO anymore.
- - - - -
b26bb2ea by VeryMilkyJoe at 2026-03-27T04:41:38-04:00
Remove backwards compatibility pattern synonym `ModLocation`
Fixes #24932
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66e5e324 by Vladislav Zavialov at 2026-03-27T04:42:25-04:00
Extend HsExpr with the StarIsType syntax (#26587, #26967)
This patch allows kinds of the form `k -> *` and `* -> k` to occur in
expression syntax, i.e. to be used as required type arguments.
For example:
{-# LANGUAGE RequiredTypeArguments, StarIsType #-}
x1 = f (* -> * -> *)
x2 = f (forall k. k -> *)
x3 = f ((* -> *) -> Constraint)
Summary of the changes:
* Introduce the HsStar constructor of HsExpr and its extension field XStar.
It is analogous to HsStarTy in HsType.
* Refactor HsStarTy to store the unicode flag as TokStar, defined as
type TokStar = EpUniToken "*" "★" -- similar to TokForall, TokRArrow, etc.
The token is stored in the extension field and replaces the Bool field.
* Extend the `infixexp2` nonterminal to parse `*` as a direct argument of `->`.
This is more limited than the full StarIsType syntax, but has the nice
property of not conflicting with the multiplication operator `a * b`.
Test case: T26967 T26967_tyop
- - - - -
f8de456f by Sylvain Henry at 2026-03-27T04:43:22-04:00
STM: don't create a transaction in the rhs of catchRetry# (#26028)
We don't need to create a transaction for the rhs of (catchRetry#)
because contrary to the lhs we don't need to abort it on retry. Moreover
it is particularly harmful if we have code such as (#26028):
let cN = readTVar vN >> retry
tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
atomically tree
Because it will stack transactions for the rhss and the read-sets of all
the transactions will be iteratively merged in O(n^2) after the
execution of the most nested retry.
This is the second attempt at implementing this. The first attempt
triggered segfaults (#26291) and has been reverted.
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
- - - - -
fcf092dd by Luite Stegeman at 2026-03-27T04:44:17-04:00
Windows: remove StgAsyncIOResult and fix crash/leaks
In stg_block_async{_void}, a stack slot was reserved for
an StgAsyncIOResult. This slot would be filled by the IO
manager upon completion of the async call.
However, if the blocked thread was interrupted by an async
exception, we would end up in an invalid state:
- If the blocked computation was never re-entered, the
StgAsyncIOResult would never be freed.
- If the blocked computation was re-entered, the thread would
find an unitialized stack slot for the StgAsyncIOResult,
leading to a crash reading its fields, or freeing the pointer.
We fix this by removing the StgAsyncIOResult altogether and writing
the result directly to the stack.
Fixes #26341
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05094993 by Luite Stegeman at 2026-03-27T04:45:12-04:00
Don't refine DEFAULT alt for unary typeclasses
A non-DEFAULT data alt for a unary typeclass dictionary would
interfere with Unary Class Magic, leading to segfaults.
fixes #27071
- - - - -
4ee260cf by sheaf at 2026-03-27T04:46:06-04:00
Fix several oversights in hsExprType
This commit fixes several oversights in GHC.Hs.Syn.Type.hsExprType:
- The 'RecordCon' case was returning the type of the constructor,
instead of the constructor application. This is fixed by using
'splitFunTys'.
- The 'ExplicitTuple' case failed to take into account tuple sections,
and was also incorrectly handling 1-tuples (e.g. 'Solo') which can
be constructed using Template Haskell.
- The 'NegApp' case was returning the type of the negation operator,
again failing to apply it to the argument. Fixed by using
'funResultTy'.
- The 'HsProc' case was computing the result type of the arrow proc
block, without taking into account the argument type. Fix that by
adding a new field to 'CmdTopTc' that stores the arrow type, so that
we can construct the correct result type `arr a b` for
`proc (pat :: a) -> (cmd :: b)`.
- The 'ArithSeq' and 'NegApp' cases were failing to take into account
the result 'HsWrapper', which could e.g. silently drop casts.
This is fixed by introducing 'syntaxExpr_wrappedFunResTy' which, on
top of taking the result type, applies the result 'HsWrapper'.
These fixes are validated by the new GHC API test T26910.
Fixes #26910
- - - - -
e97232ce by Hai at 2026-03-27T04:47:04-04:00
Parser.y: avoid looking at token with QualifiedDo
This changes the behavior of 'hintQualifiedDo' so that the supplied
token is not inspected when the QualifiedDo language extension bit is
set.
- - - - -
9831385b by Vladislav Zavialov at 2026-03-27T17:22:30-04:00
Infix holes in types (#11107)
This patch introduces several improvements that follow naturally from
refactoring HsOpTy to represent the operator as an HsType, aligning it
with the approach taken by OpApp and HsExpr.
User-facing changes:
1. Infix holes (t1 `_` t2) are now permitted in types, following the
precedent set by term-level expressions.
Test case: T11107
2. Error messages for illegal promotion ticks are now reported at more
precise source locations.
Test case: T17865
Internal changes:
* The definition of HsOpTy now mirrors that of OpApp:
| HsOpTy (XOpTy p) (LHsType p) (LHsType p) (LHsType p)
| OpApp (XOpApp p) (LHsExpr p) (LHsExpr p) (LHsExpr p)
This moves us one step closer to unifying HsType and HsExpr.
* Ignoring locations,
the old pattern match (HsOpTy x prom lhs op rhs)
is now written as (HsOpTy x lhs (HsTyVar x' prom op) rhs)
but we also handle (HsOpTy x lhs (HsWildCardTy x') rhs)
Constructors other than HsTyVar and HsWildCardTy never appear
in the operator position.
* The various definitions across the compiler have been updated to work
with the new representation, drawing inspiration from the term-level
pipeline where appropriate. For example,
ppr_infix_ty <=> ppr_infix_expr
get_tyop <=> get_op
lookupTypeFixityRn <=> lookupExprFixityRn
(the latter is factored out from rnExpr)
Test cases: T11107 T17865
- - - - -
5b6757d7 by mangoiv at 2026-03-27T17:23:19-04:00
ci: build i386 non-validate for deb12
This is a small fix that will unlock ghcup metadata to run, i386 debian
12 was missing as a job.
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cf942119 by Cheng Shao at 2026-03-30T15:24:37-04:00
ghc-boot: remove unused SizedSeq instances and functions
This commit removes unused `SizedSeq` instances and functions, only
keeping the bits we need for hpc tick sequence for now.
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22c5b7cc by Cheng Shao at 2026-03-30T15:24:38-04:00
ghci: remove unused GHCi.BinaryArray
This patch removes the unused `GHCi.BinaryArray` module from `ghci`.
Closes #27108.
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77abb4ab by Cheng Shao at 2026-03-30T15:25:21-04:00
testsuite: mark T17912 as fragile on Windows
T17912 is still fragile on Windows, it sometimes unexpectedly pass in
CI. This especially strains our already scarce Windows CI runner
resources. Mark it as fragile on Windows for the time being.
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d741a6cc by Andreas Klebinger at 2026-03-31T04:39:33-04:00
Bump minimum shake version for hadrian.
We also add the shake version we want to stack.yaml
Fixes #26884
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5e556f9e by Vladislav Zavialov at 2026-03-31T04:40:16-04:00
Status check for the HsType~HsExpr refactoring (#25121)
Add a test case to track the status of a refactoring project within GHC
whose goal is to arrive at the following declaration:
type HsType = HsExpr
The rationale for this is to increase code reuse between the term- and
type-level code in the compiler front-end (AST, parser, renamer, type checker).
The status report is saved to testsuite/tests/ghc-api/T25121_status.stdout
and provides useful insights into what needs to happen to make progress on
the ticket.
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acffb1b1 by fendor at 2026-03-31T04:41:02-04:00
Extract Binary instances to `GHC.ByteCode.Binary`
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e2ea8e25 by fendor at 2026-03-31T04:41:02-04:00
Add `seqNonEmpty` for evaluating `NonEmpty a`
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048b00b7 by fendor at 2026-03-31T04:41:02-04:00
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.
We introduce the `linkable-space` test which makes sure that after
loading, no `DotGBC` or `UnlinkedBCO` is retained.
-------------------------
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.
- - - - -
2d1c1997 by Simon Jakobi at 2026-03-31T04:41:46-04:00
Eliminate dictionary-passing in ListMap operations
Mark the ListMap helpers 'INLINABLE' so importing modules can specialise
the 'TrieMap (ListMap m)' methods and avoid recursive dictionary-passing.
See Note [Making ListMap operations specialisable].
Fixes #27097
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ed2c6570 by Cheng Shao at 2026-03-31T04:42:33-04:00
testsuite: fix testdir cleanup logic on Windows
testdir cleanup is unreliable on Windows (#13162) and despite existing
hacks in the driver, new failure mode has occurred. This patch makes
it print the warning and carry on when failed to clean up a testdir,
instead of reporting a spurious framework failure. See added comment
for detailed explanation.
- - - - -
d9388e29 by Simon Jakobi at 2026-03-31T13:14:59-04:00
Add regression test for #18177
Closes #18177.
Assisted-by: Codex
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6a10045c by mangoiv at 2026-03-31T13:15:43-04:00
ci: allow metric decrease for two tests on i386
There has been a nightly failure on i386 due to a compiler runtime
improvement on i386 debian 12. We allow that.
Metric Decrease (test_env='i386-linux-deb12'):
T12707 T8095
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7fbb4fcb by Rodrigo Mesquita at 2026-04-01T12:16:33+00:00
Bump default language edition to GHC2024
As per the accepted ghc-proposal#632
Fixes #26039
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5ae43275 by Peng Fan at 2026-04-01T19:01:06-04:00
NCG/LA64: add cmpxchg and xchg primops
And append some new instructions for LA664 uarch.
Apply fix to cmpxchg-prim by Andreas Klebinger.
Suggestions in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15515
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8f95534a by Duncan Coutts at 2026-04-01T19:01:52-04:00
Remove signal-based ticker implementations
Fixes issue #27073
All supported platforms should work with the pthreads + nanosleep based
ticker implementation. This avoids all the problems with using signals.
In practice, all supported platforms were probably using the non-signal
tickers already, which is probably why we do not get lots of reports
about deadlocks and other weirdness: we were definately using functions
that are not async signal safe in the tick handler (such as fflush to
flussh the eventlog).
Only Solaris was explicitly using the timer_create ticker impl, and even
Solaris could probably use the pthreads one (if anyone cared: Solaris is
no longer a Teir 3 supported platform).
Plausibly the only supported platform that this will change will be AIX,
which should now use the pthreads impl.
- - - - -
51b32b0d by Duncan Coutts at 2026-04-01T19:01:52-04:00
Tidy up some timer/ticker comments elsewhere
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7562bcd7 by Duncan Coutts at 2026-04-01T19:01:52-04:00
Remove now-unused install_vtalrm_handler
Support function used by both of the signal-based ticker
implementations.
- - - - -
6da127c7 by Duncan Coutts at 2026-04-01T19:01:52-04:00
No longer probe for timer_create in rts/configure
It was only used by the TimerCreate.c ticker impl.
- - - - -
3fd490fa by Duncan Coutts at 2026-04-01T19:01:53-04:00
Note that rtsTimerSignal is deprecated.
- - - - -
63099b0f by Simon Jakobi at 2026-04-01T19:02:39-04:00
Add perf test for #13960
Closes #13960.
- - - - -
58009c14 by Apoorv Ingle at 2026-04-02T09:51:24+01:00
Streamline expansions using HsExpansion (#25001)
Notes added [Error Context Stack] [Typechecking by expansion: overview]
Notes updated Note [Expanding HsDo with XXExprGhcRn] [tcApp: typechecking applications]
-------------------------
Metric Decrease:
T9020
-------------------------
There are 2 key changes:
1. `HsExpand` datatype mediates between expansions
2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv`
This has some consequences detailed below:
1. `HsExpand` datatype mediates between expansions
* Simplifies the implementations of `tcExpr` to work on `XExpr`
* Removes `VACtxt` (and its associated `VAExpansion` and `VACall`) datatype, it is subsumed by simply a `SrcSpan`.
* Removes the function `addHeadCtxt` as it is now mearly setting a location
* The function `tcValArgs` does its own argument number management
* move `splitHsTypes` out of `tcApp`
* Removes special case of tcBody from `tcLambdaMatches`
* Removes special case of `dsExpr` for `ExpandedThingTc`
* Renames `tcMonoExpr` -> `tcMonoLExpr`, `tcMonoExprNC` -> `tcMonoLExpr`
* Renames `EValArg`, `EValArgQL` fields: `ea_ctxt` -> `ea_loc_span` and `eaql_ctx` -> `eaql_loc_span`
* Remove `PopErrCtxt` from `XXExprGhcRn`
* `fun_orig` in tcInstFun depends on the SrcSpan of the head of the application chain (similar to addArgCtxt)
- it references the application chain head if it is user located, or
uses the error context stack as a fallback if it's a generated
location
* Make a new variant `GeneratedSrcSpan` in `SrcSpan` for HIEAst Nodes
- Expressions wrapped around `GeneratedSrcSpan` are ignored and never added to the error context stack
- In Explicit list expansion `fromListN` is wrapped with a `GeneratedSrcSpan` with `GeneratedSrcSpanDetails` field to store the original srcspan
2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv`
* Merge `HsThingRn` to `HsCtxt`
* Landmark Error messages are now just computed on the fly
* Make HsExpandedRn and HsExpandedTc payload a located HsExpr GhcRn
* `HsCtxt` are tidied and zonked at the end right before printing
Co-authored-by: simonpj <simon.peytonjones(a)gmail.com>
- - - - -
bc4b4487 by Zubin Duggal at 2026-04-03T14:22:27-04:00
driver: recognise .dyn_o as a valid object file to link if passed on the command line.
This allows plugins compiled with this suffix to run.
Fixes #24486
- - - - -
5ebb9121 by Simon Jakobi at 2026-04-03T14:23:11-04:00
Add regression test for #16145
Closes #16145.
- - - - -
c1fc1c44 by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Refactor eta-expansion in Prep
The Prep pass does eta-expansion but I found cases where it was
doing bad things. So I refactored and simplified it quite a bit.
In the new design
* There is no distinction between `rhs` and `body`; in particular,
lambdas can now appear anywhere, rather than just as the RHS of
a let-binding.
* This change led to a significant simplification of Prep, and
a more straightforward explanation of eta-expansion. See the new
Note [Eta expansion]
* The consequences is that CoreToStg needs to handle naked lambdas.
This is very easy; but it does need a unique supply, which forces
some simple refactoring. Having a unique supply to hand is probably
a good thing anyway.
- - - - -
21beda2c by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Clarify Note [Interesting dictionary arguments]
Ticket #26831 ended up concluding that the code for
GHC.Core.Opt.Specialise.interestingDict was good, but the
commments were a bit inadequate.
This commit improves the comments slightly.
- - - - -
3eaac1f2 by Simon Peyton Jones at 2026-04-03T19:56:07-04:00
Make inlining a bit more eager for overloaded functions
If we have
f d = ... (class-op d x y) ...
we should be eager to inline `f`, because that may change the
higher order call (class-op d x y) into a call to a statically
known function.
See the discussion on #26831.
Even though this does a bit /more/ inlining, compile times
decrease by an average of 0.4%.
Compile time changes:
DsIncompleteRecSel3(normal) 431,786,104 -2.2%
ManyAlternatives(normal) 670,883,768 -1.6%
ManyConstructors(normal) 3,758,493,832 -2.6% GOOD
MultilineStringsPerf(normal) 29,900,576 -2.8%
T14052Type(ghci) 1,047,600,848 -1.2%
T17836(normal) 392,852,328 -5.2%
T18478(normal) 442,785,768 -1.4%
T21839c(normal) 341,536,992 -14.1% GOOD
T3064(normal) 174,086,152 +5.3% BAD
T5631(normal) 506,867,800 +1.0%
hard_hole_fits(normal) 209,530,736 -1.3%
info_table_map_perf(normal) 19,523,093,184 -1.2%
parsing001(normal) 377,810,528 -1.1%
pmcOrPats(normal) 60,075,264 -0.5%
geo. mean -0.4%
minimum -14.1%
maximum +5.3%
Runtime changes
haddock.Cabal(normal) 27,351,988,792 -0.7%
haddock.base(normal) 26,997,212,560 -0.6%
haddock.compiler(normal) 219,531,332,960 -1.0%
Metric Decrease:
LinkableUsage01
ManyConstructors
T17949
T21839c
T13035
TcPlugin_RewritePerf
hard_hole_fits
Metric Increase:
T3064
- - - - -
5cbc2c82 by Matthew Pickering at 2026-04-03T19:57:02-04:00
bytecode: Add magic header/version to bytecode files
In order to avoid confusing errors when using stale interface files (ie
from an older compiler version), we add a simple header/version check
like the one for interface files.
Fixes #27068
- - - - -
d95a1936 by fendor at 2026-04-03T19:57:02-04:00
Add constants for bytecode in-memory buffer size
Introduce a common constant for the default size of the .gbc and
.bytecodelib binary buffer.
The buffer is by default set to 1 MB.
- - - - -
b822c30a by mangoiv at 2026-04-03T19:57:49-04:00
testsuite: filter stderr for static001 on darwin
This reactivates the test on x86_64 darwin as this should have been done
long ago and ignores warnings emitted by ranlib on newer version of the
darwin toolchain since they are benign. (no symbols for stub libraries)
Fixes #27116
- - - - -
28ce1f8a by Andreas Klebinger at 2026-04-03T19:58:44-04:00
Give the Data instance for ModuleName a non-bottom toConstr implementation.
I've also taken the liberty to add Note [Data.Data instances for GHC AST Types]
describing some of the uses of Data.Data I could find.
Fixes #27129
- - - - -
8ca41ffe by mangoiv at 2026-04-03T19:59:30-04:00
issue template: fix add bug label
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3981db0c by Sylvain Henry at 2026-04-03T20:00:33-04:00
Add more canned GC functions for common register patterns (#27142)
Based on analysis of heap-check sites across the GHC compiler and Cabal,
the following patterns were not covered by existing canned GC functions
but occurred frequently enough to warrant specialisation:
stg_gc_ppppp -- 5 GC pointers
stg_gc_ip -- unboxed word + GC pointer
stg_gc_pi -- GC pointer + unboxed word
stg_gc_ii -- two unboxed words
stg_gc_bpp -- byte (I8) + two GC pointers
Adding these reduces the fraction of heap-check sites falling back to
the generic GC path from ~1.4% to ~0.4% when compiling GHC itself.
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
- - - - -
d17d1435 by Matthew Pickering at 2026-04-03T20:01:19-04:00
Make home unit dependencies stored as sets
Co-authored-by: Wolfgang Jeltsch <wolfgang(a)well-typed.com>
- - - - -
92a97015 by Simon Peyton Jones at 2026-04-05T00:58:57+01:00
Add Invariant (NoTypeShadowing) to Core
This commit addresses #26868, by adding
a new invariant (NoTypeShadowing) to Core.
See Note [No type-shadowing in Core] in GHC.Core
- - - - -
8b5a5020 by Simon Peyton Jones at 2026-04-05T00:58:57+01:00
Major refactor of free-variable functions
For some time we have had two free-variable mechanims for types:
* The "FV" mechanism, embodied in GHC.Utils.FV, which worked OK, but
was fragile where eta-expansion was concerned.
* The TyCoFolder mechanism, using a one-shot EndoOS accumulator
I finally got tired of this and refactored the whole thing, thereby
addressing #27080. Now we have
* `GHC.Types.Var.FV`, which has a composable free-variable result type,
very much in the spirit of the old `FV`, but much more robust.
(It uses the "one shot trick".)
* GHC.Core.TyCo.FVs now has just one technology for free variables.
All this led to a lot of renaming.
There are couple of error-message changes. The change in T18451
makes an already-poor error message even more mysterious. But
it really needs a separate look.
We also now traverse the AST in a different order leading to a different
but still deterministic order for FVs and test output has been adjusted
accordingly.
- - - - -
4bf040c6 by sheaf at 2026-04-05T14:56:29-04:00
Add utility pprTrace_ function
This function is useful for quick debugging, as it can be added to a
where clause to pretty-print debugging information:
fooBar x y
| cond = body1
| otherwise = body2
where
!_ = pprTrace_ "fooBar" $
vcat [ text "x:" <+> ppr x
, text "y:" <+> ppr y
, text "cond:" <+> ppr cond
]
- - - - -
502e6ffe by Andrew Lelechenko at 2026-04-07T04:47:21-04:00
base: improve error message for Data.Char.chr
As per https://github.com/haskell/core-libraries-committee/issues/384
- - - - -
b21bd52e by Simon Peyton Jones at 2026-04-07T04:48:07-04:00
Refactor FunResCtxt a bit
Fixes #27154
- - - - -
7fe84ea5 by Zubin Duggal at 2026-04-07T19:11:52+05:30
compiler: Warn when -finfo-table-map is used with -fllvm
These are currently not supported together.
Fixes #26435
- - - - -
4a45a7da by Matthew Pickering at 2026-04-08T04:37:29-04:00
packaging: correctly propagate build/host/target to bindist configure script
At the moment the host and target which we will produce a compiler for
is fixed at the initial configure time. Therefore we need to persist
the choice made at this time into the installation bindist as well so we
look for the right tools, with the right prefixes at install time.
In the future, we want to provide a bit more control about what kind of
bindist we produce so the logic about what the host/target will have to
be written by hadrian rather than persisted by the configure script. In
particular with cross compilers we want to either build a normal stage 2
cross bindist or a stage 3 bindist, which creates a bindist which has a
native compiler for the target platform.
Fixes #21970
Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com>
- - - - -
b0950df6 by Sven Tennie at 2026-04-08T04:37:29-04:00
Cross --host and --target no longer required for cross (#21970)
We set sane defaults in the configure script. Thus, these paramenters
aren't required any longer.
- - - - -
fef35216 by Sven Tennie at 2026-04-08T04:37:30-04:00
ci: Define USER_CONF_CC_OPTS_STAGE2 for aarch64/mingw
ghc-toolchain doesn't see $CONF_CC_OPTS_STAGE2 when the bindist gets
configured. So, the hack to override the compiler gets lost.
- - - - -
8dd6f453 by Cheng Shao at 2026-04-08T04:38:11-04:00
ghci: use ShortByteString for LookupSymbol/LookupSymbolInDLL/LookupClosure messages
This patch refactors ghci to use `ShortByteString` for
`LookupSymbol`/`LookupSymbolInDLL`/`LookupClosure` messages as the
first part of #27147.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
371ef200 by Cheng Shao at 2026-04-08T04:38:11-04:00
ghci: use ShortByteString for MkCostCentres message
This patch refactors ghci to use `ShortByteString` for `MkCostCentres`
messages as a first part of #27147. This also considerably lowers the
memory overhead of breakpoints when cost center profiling is enabled.
-------------------------
Metric Decrease:
interpreter_steplocal
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
4a122bb6 by Phil Hazelden at 2026-04-08T20:49:42-04:00
Implement modifiers syntax.
The `%m` syntax of linear types is now accepted in more places, to allow
use by future extensions, though so far linear types is still the only
consumer.
This may break existing code where it
* Uses -XLinearTypes.
* Has code of the form `a %m -> b`, where `m` can't be inferred to be
kind Multiplicity.
The code can be fixed either by adding a kind annotation, or by setting
`-XLinearTypes -XNoModifiers`.
Proposal:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0370-m…
- - - - -
07267f79 by Zubin Duggal at 2026-04-08T20:50:25-04:00
hadrian: Don't include the package hash in the haddock directory
Since GHC 9.8 and hash_unit_ids, haddock urls have looked like`ghc-9.10.3/doc/html/libraries/base-4.20.2.0-39f9/**/*.html`
The inclusion of the hash makes it hard for downstream non-boot packages to properly link to these files, as the hash is not
part of a standard cabal substitution.
Since we only build one version of each package, we don't need the hash to disambiguate anything, we can just remove it.
Fixes #26635
- - - - -
0a83b95b by ARATA Mizuki at 2026-04-08T20:51:18-04:00
testsuite: Allow multiple ways to be run by setting multiple command-line options
This patch allows multiple `--test-way`s to take effect, like:
$ hadrian/build test --test-way=normal --test-way=llvm
Previously, only one way was run if the test speed was 'normal' or 'fast'.
Closes #26926
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
- - - - -
e841931c by Teo Camarasu at 2026-04-08T20:52:00-04:00
doc: improve eventlog-flush-interval flag documentation
We mention the performance cost and how this flag can be turned off.
Resolves #27056
- - - - -
e332db25 by Teo Camarasu at 2026-04-08T20:52:01-04:00
docs/user_guide: fix typo
- - - - -
5b82080a by Simon Jakobi at 2026-04-08T20:52:44-04:00
Fix -dsuppress-uniques for free variables in demand signatures
Before: Str=b{sXyZ->S}
With this patch: Str=b{S}
T13143.stderr is updated accordingly.
Fixes #27106.
- - - - -
b7a084cc by Simon Jakobi at 2026-04-08T20:53:27-04:00
Documentation fixes for demand signature notation
Fixes #27115.
- - - - -
59391132 by Simon Jakobi at 2026-04-08T20:54:08-04:00
Use upsert for non-deleting map updates
Some compiler functions were using `alter`, despite never removing
any entries: they only update an existing entry or insert a new one.
These functions are converted to using `upsert`:
alter :: (Maybe a -> Maybe a) -> Key -> Map a -> Map a
upsert :: (Maybe a -> a) -> Key -> Map a -> Map a
`upsert` variants are also added to APIs of the various Word64Map
wrapper types.
The precedent for this `upsert` operation is in the containers library:
see https://github.com/haskell/containers/pull/1145
Metrics: compile_time/bytes allocated
-------------------------------------
geo. mean: -0.1%
minimum: -0.5%
maximum: +0.0%
Resolves #27140.
- - - - -
da7e82f4 by Cheng Shao at 2026-04-08T20:54:49-04:00
testsuite: fix testsuite run for +ipe again
This patch makes the +ipe flavour transformer pass the entire
testsuite again by dropping stdout/stderr checks of certain tests that
are sensitive to stack layout changes with `+ipe`. Related: #26799.
- - - - -
b135a87d by Zubin Duggal at 2026-04-09T19:36:50+05:30
Bump directory submodule to 1.3.11.0 (unreleased)
- - - - -
3a291d07 by Zubin Duggal at 2026-04-09T19:36:50+05:30
Bump file-io submodule to 0.2.0
- - - - -
e0ab606d by Zubin Duggal at 2026-04-10T18:40:20+05:30
Release notes for GHC 10.0
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e08b9b34 by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump ghc-prim version to 0.14.0
- - - - -
a92aac6e by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump template-haskell to 2.25.0.0; update submodule exceptions for TH 2.25
- - - - -
f254d9e8 by Zubin Duggal at 2026-04-10T18:40:20+05:30
Bump GHC version to 10.0
- - - - -
6ce0368a by Zubin Duggal at 2026-04-10T18:40:28+05:30
Bump base to 4.23.0.0; update submodules for base 4.24 upper bound
- - - - -
702fb8a5 by Zubin Duggal at 2026-04-10T18:40:28+05:30
Bump GHC version to 10.1; update submodules template-haskell-lift and template-haskell-quasiquoter for ghc-internal 10.200
- - - - -
75df1ca4 by Zubin Duggal at 2026-04-10T18:40:28+05:30
Use changelog.d for release notes (#26002)
GHC now uses a fragment-based changelog workflow using a custom script adapted from https://codeberg.org/fgaz/changelog-d.
Contributors add a file in changelog.d/ for each user-facing change.
At release time, these are assembled into release notes for sphinx (in RST) format, using
the tool.
New hadrian `changelog` target to generate changelogs
CI job to validate changelog entries for MRs unless skipped with ~"no-changelog" label
Teach sphinx about ghc-mr: extlink to link to MRs
Remove `ghc-package-list` from sphinx, and implement it in changelog-d instead (Fixes #26476).
(cherry picked from commit 989c07249978f418dfde1353abfad453f024d61a)
- - - - -
585d7450 by Luite Stegeman at 2026-04-11T02:17:13-04:00
tc: discard warnings in tcUserStmt Plan C
We typecheck let_stmt twice, but we don't want the warnings twice!
see #26233
- - - - -
2df604e9 by Sylvain Henry at 2026-04-11T02:19:30-04:00
Introduce TargetInt to represent target's Int (#15973)
GHC was using host 'Int' in several places to represent values that
live in the target machine's 'Int' type. This is silently wrong when
cross-compiling from a 32-bit host to a 64-bit target: the host Int
is 32 bits while the target Int is 64 bits.
See Note [TargetInt] in GHC.Platform.
Also used the opportunity to make DynTag = Word8.
Fixes #15973
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
- - - - -
d419e972 by Luite Stegeman at 2026-04-13T15:16:04-04:00
Suppress desugaring warnings in the pattern match checker
Avoid duplicating warnings from the actual desugaring pass.
fixes #25996
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c5b80dd0 by Phil de Joux at 2026-04-13T15:16:51-04:00
Typo ~/ghc/arch-os-version/environments
- - - - -
71462fff by Luite Stegeman at 2026-04-13T15:17:38-04:00
add changelog entry for #26233
- - - - -
d1ddfd4b by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Add test for #25636
The existing test behaviour of "T23146_liftedeq" changed because the
simplifier now does a bit more inlining. We can restore the previous bad
behavior by using an OPAQUE pragma.
This test doubles as a test for #25636 when run in ghci, so we add it as
such.
- - - - -
b9df40ee by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
refactor: protoBCOName is always a Name
Simplifies the code by removing the unnecessary type argument to
ProtoBCO which was always 'Name'
- - - - -
5c2a179e by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Allocate static constructors for bytecode
This commit adds support for static constructors when compiling and
linking ByteCode objects.
Top-level StgRhsCon get lowered to ProtoStaticCons rather than to
ProtoBCOs. A ProtoStaticCon gets allocated directly as a data con
application on the heap (using the new primop newConApp#).
Previously, we would allocate a ProtoBCO which, when evaluated, would
PACK and return the constructor.
A few more details are given in Note [Static constructors in Bytecode].
Secondly, this commit also fixes issue #25636 which was caused by
linking *unlifted* constructors in BCO instructions as
- (1) a thunk indexing the array of BCOs in a module
- (2) which evaluated to a BCO which still had to be evaluated to
return the unlifted constructor proper.
The (2) issue has been resolved by allocating the static constructors
directly. The (1) issue can be resolved by ensuring that we allocate all
unlifted top-level constructors eagerly, and leave the knot-tying for
the lifted BCOs and top-level constructors only.
The top-level unlifted constructors are never mutually recursive, so we
can allocate them all in one go as long as we do it in topological
order. Lifted fields of unlifted constructors can still be filled by the
knot-tied lifted variables since in those fields it is fine to keep
those thunks. See Note [Tying the knot in createBCOs] for more details.
Fixes #25636
-------------------------
Metric Decrease:
LinkableUsage01
-------------------------
- - - - -
cde47053 by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Revert "StgToByteCode: Assert that PUSH_G'd values are lifted"
This reverts commit ec26c54d818e0cd328276196930313f66b780905.
Ever since f7a22c0f4e9ae0dc767115d4c53fddbd8372b777, we now do support
and will link top-level unlifted constructors into evaluated and
properly tagged values which we can reference with PUSH_G.
This assertion is no longer true and triggered a failure in T25636
- - - - -
c7a7e5b8 by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
refactor: Tag more remote Ptrs as RemotePtr
Pure refactor which improves the API of
- GHC.ByteCode.Linker
- GHC.Runtime.Interpreter
- GHC.Runtime.Interpreter.Types.SymbolCache
by using `RemotePtr` for more functions which used to return `Ptr`s that
could potentially be in a foreign process. E.g. `lookupIE`,
`lookupStaticPtr`, etc...
- - - - -
fc59494c by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
Add float# and subword tests for #25636
These tests cover that static constructors in bytecode work correctly
for Float# and subword values (Word8#, Word16#)
- - - - -
477f521b by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00
test: Validate topoSort logic in createBCOs
This test validates that the topological sorting and ordering of the
unlifted constructors and lifted constructors in `createBCOs` is
correct.
See `Note [Tying the knot in createBCOs]` for why tying the knot for the
created BCOs is slightly difficult and why the topological sorting is
necessary.
This test fails when `let topoSortedObjs = topSortObjs objs` is
substituted by `let topoSortedObjs = zip [0..] objs`, thus witnessing
the toposort logic is correct and necessary.
The test calls the ghci `createBCOs` directly because it is currently
impossible to construct in Source Haskell a situation where a top-level
static unlifted constructor depends on another (we don't have top-level
unlifted constructors except for nullary constructors like `Leaf ::
(UTree :: UnliftedType)`).
This is another test for fix for #25636
- - - - -
2d9c30be by Simon Jakobi at 2026-04-14T18:42:00-04:00
Improve tests for `elem`
...in order to simplify the work on #27096.
* Improve T17752 by including the Core output in golden files, checking
both -O1 and -O2.
* Add tests for fusion and no-fusion cases.
Fixes #27101.
- - - - -
2dadf3b0 by sheaf at 2026-04-16T13:28:39-04:00
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.
The most important change is that we revert the logic (added in 85b0aae2)
that allowed ticks to be placed around coercions, which caused serious
issues (e.g. #27121). It was just a mistake, as it doesn't make sense
to put a tick around a coercion.
Also adds Note [Pushing SCCs inwards] which clarifies the logic for
pushing SCCs into lambdas, constructor applications, and dropping SCCs
around non-function variables (in particular the treatment of splittable
ticks).
A few other changes are also implemented:
- simplify 'can_split' predicate (no functional change)
- combine profiling ticks into one when possible
Fixes #26878, #26941 and #27121
Co-authored-by: simonpj <simon.peytonjones(a)gmail.com>
- - - - -
a0d6f1f4 by Simon Jakobi at 2026-04-16T13:29:28-04:00
Add regression test for #9074
Closes #9074.
- - - - -
d178ee89 by Sylvain Henry at 2026-04-16T13:30:25-04:00
Add changelog for #15973
- - - - -
e8a196c6 by sheaf at 2026-04-16T13:31:19-04:00
Deal with 'noSpec' in 'coreExprToPmLit'
This commit makes two separate changes relating to
'GHC.HsToCore.Pmc.Solver.Types.coreExprAsPmLit':
1. Commit 7124e4ad mistakenly marked deferred errors as non-canonical,
which led to the introduction of 'nospec' wrappers in the
generated Core. This reverts that accident by declaring deferred
errors as being canonical, avoiding spurious 'nospec' wrapping.
2. Look through magic identity-like Ids such as 'nospec', 'inline' and
'lazy' in 'coreExprAsPmLit', just like Core Prep does.
There might genuinely be incoherent evidence, but that shouldn't
obstruct the pattern match checker. See test T27124a.
Fixes #25926 #27124
-------------------------
Metric Decrease:
T3294
-------------------------
- - - - -
8cb99552 by Sylvain Henry at 2026-04-16T19:22:43-04:00
hadrian: warn when package index is missing (#16484)
Since cabal-install 3.0 we can query the path of remote-repo-cache and
check if hackage package index is present.
Fixes #16484
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d6ce7477 by Richard Eisenberg at 2026-04-16T19:23:25-04:00
Teach hadrian to --skip-test.
Fixes #27188.
This adds the --skip-test flag to `hadrian build`, as documented in the
patch.
- - - - -
7666f4a9 by Fendor at 2026-04-17T22:29:51-04:00
Migrate `ghc-pkg` to use `OsPath` and `file-io`
`ghc-pkg` should use UNC paths as much as possible to avoid MAX_PATH
issues on windows.
`file-io` uses UNC Paths by default on windows, ensuring we use the
correct APIs and that we finally are no longer plagued by MAX_PATH
issues in CI and private machines.
On top of it, the higher correctness of `OsPath` is appreciated in this
small codebase. Also, we improve memory usage very slightly, due to the
more efficient memory representation of `OsPath` over `FilePath`
Adds `ghc-pkg` regression test for MAX_PATH on windows
Make sure `ghc-pkg` behaves as expected when long paths (> 255) are
involved on windows.
Let's generate a testcase where we can actually observe that `ghc-pkg`
behaves as epxected.
See the documentation for windows on Maximum Path Length Limitation:
* `https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation`
Adds changelog entry for long path support in ghc-pkg.
- - - - -
78434e8c by Simon Peyton Jones at 2026-04-17T22:30:38-04:00
Kill off the substitution in Lint
Now that we have invariant (NoTypeShadowing) we no longer
need Lint to carry an ambient substitution. This makes it
simpler and faster. A really worthwhile refactor.
There are some knock-on effects
* Linting join points after worker/wrapper. See
Note [Join points and beta redexes]
* Running a type substitution after the desugarer.
See Note [Substituting type-lets] in
the new module GHC.Core.SubstTypeLets
Implements #27078
Most perf tests don't use Lint so we won't see a perf incresae.
But T1969, which uses -O0 and Lint, gets 1.3% worse because it has
to run the SubstTypeLets pass which is a somewhat expensive no-op
Overall though compile-time allocations are down 0.1%.
Metric Increase:
T1969
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86ca6c2c by mangoiv at 2026-04-17T22:31:22-04:00
testsuite: inline elemCoreTest
Some weird (probably python scoping) rule caused elemCoreTest, a regex
being out of scope on ubuntu, presumably because of a newer python version.
This patch just inlines the regex, which fixes the issue.
Fixes #27193
- - - - -
72d6dc74 by aparker at 2026-04-20T20:15:44-04:00
NCG: Implement constant folding for vector simd ops (Issue #25030)
- - - - -
b9cab907 by sheaf at 2026-04-20T20:15:44-04:00
Mark some SIMD tests as broken on i386 optllvm
As seen in #25498, several SIMD tests are broken on i386 in the optllvm
way. This commit marks them as "expect_broken".
- - - - -
76528cc3 by Wolfgang Jeltsch at 2026-04-20T20:16:25-04:00
Move most of the `System.IO` implementation into `base`
This involves a rewrite of the `combine` helper function to avoid the
use of `last`, which would now be flagged as an error.
Metric Decrease:
LinkableUsage01
T3294
Metric Increase:
T12227
T12707
T5642
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04d143c0 by Luite Stegeman at 2026-04-21T14:05:33-04:00
rts: add a few missing i386 relocations in the rts linker
- - - - -
014087e7 by Luite Stegeman at 2026-04-21T14:05:34-04:00
CodeOutput: Fix finalizers on multiple platforms
- ELF platforms: emit .fini_array section
- wasm32/Darwin: emit initializer with __cxa_atexit call
- Windows: use -Wl,--whole-archive to prevent dropping finalizer symbols
- rts linker: fix crash/assertion failure unloading objects with finalizers
fixes #27072
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915bba6f by Simon Jakobi at 2026-04-21T14:06:16-04:00
Add regression test for #10531
Closes #10531.
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86a646a6 by Andreas Klebinger at 2026-04-22T13:00:05-04:00
Revert use of generic instances for compiler time perf reasons.
Revert "Derive Semigroup/Monoid for instances believed could be derived in #25871"
This reverts commit 11a04cbb221cc404fe00d65d7c951558ede4caa9.
Revert "add Ghc.Data.Pair deriving"
This reverts commit 15d9ce449e1be8c01b89fd39bdf1e700ea7d1dce.
- - - - -
bc9ee1cf by Wen Kokke at 2026-04-22T13:00:51-04:00
hadrian: Fix docs to remove static flavour
In 638f6548, the static flavour was turned into into the fully_static
flavour transformer. However, this commit did not update flavours.md.
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cc9cc6d5 by Cheng Shao at 2026-04-23T09:40:46+00:00
configure: bump LlvmMaxVersion to 23
This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases.
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2ea7ef8e by Cheng Shao at 2026-04-23T09:46:26+00:00
changelog: add llvm 22.x support
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5574ee10 by Cheng Shao at 2026-04-24T08:24:30-04:00
compiler: avoid unused temporary `appendFS` operands
This patch fixes unused temporary `appendFS` operands in the codebase
that are retained in the `FastString` table after concatenation.
Rewrite rules are added so that if an operand is
`fsLit`/`mkFastString`, the `appendFS` application is rewritten to
append the `ShortByteString` operands first. The patch also fixes
`sconcat` behavior to align with `mconcat` for the same reason. Fixes #27205.
- - - - -
4ed78760 by mangoiv at 2026-04-24T08:25:13-04:00
contributing: adjust MR template to be less verbose
- MR template only shows text that is relevant for submissiong
- MR template was rewritten so it's readable from a user's and reviewer's
perspective
Resolves #27165
Co-Authored-By: @sheaf
- - - - -
87db83e2 by Cheng Shao at 2026-04-24T14:37:21-04:00
ci: bump freebsd boot ghc to 9.10.3
This commit bumps freebsd boot ghc to 9.10.3 to align with other
platforms and prevent outdated boot libs in boot ghc to block the
freebsd job.
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17e3a0b7 by Cheng Shao at 2026-04-24T14:37:21-04:00
compiler: improve Binary instance of Array
This patch improves the `Binary` instance of `Array`:
- We no longer allocate intermediate lists. When serializing an
`Array`, we iterate over the elements directly; when deserializing
it, we allocate the result `Array` and fill it in a loop.
- Now we only serialize the array bounds tuple; the length field is
not needed.
Closes #27109.
- - - - -
2d30f7d3 by sheaf at 2026-04-24T14:38:23-04:00
Vendor mini-QuickCheck for testsuite
This commit extracts the vendored QuickCheck implementation from the
foundation testsuite to make it more broadly available in the GHC
testsuite, and makes use of it in the simd006 test (which also used
a vendored QuickCheck implementation).
On the way, we update the linear congruential generator to avoid the
shortcoming of only generating 31 bit large numbers.
Fixes #25990 and #25969.
- - - - -
1350271b by sheaf at 2026-04-27T09:32:53-04:00
Ensure TcM plugins are only initialised once
This commit ensures we keep TcM plugins (typechecker plugins,
defaulting plugins and hole fit plugins) running all the way through
desugaring, instead of stopping them at the end of typechecking.
To do this, the "stop" actions of TcPlugin and DefaultingPlugin are
split into two: one for the "post-typecheck" action, and one for the
final shutdown action (after desugaring).
This allows the plugins to be invoked by the pattern match checker
(during desugaring) without having to be repeatedly re-initialised and
stopped, fixing #26839.
In the process, this commit modifies 'initTc' and 'initTcInteractive',
adding an extra argument that describes whether to start/stop the 'TcM'
plugins.
See Note [Stop TcM plugins after desugaring] for an overview.
- - - - -
42549222 by sheaf at 2026-04-27T09:33:50-04:00
Hadrian: add --keep-response-files
This commit adds a Hadrian flag that allows response files to be
retained. This is useful for debugging a failing Hadrian command line.
- - - - -
40564e8d by sheaf at 2026-04-27T09:34:46-04:00
hadrian/build-cabal.bat: fix build on Windows
Commit 8cb99552f6 introduced a warning for a missing package index.
However, the logic was faulty on Windows: the piping was broken, and
"remote-repo-cache:" was being interpreted as a (malformed) drive letter,
leading to the error:
The filename, directory name, or volume label syntax is incorrect.
This commit fixes that by using a temporary file instead of piping.
- - - - -
14bc71e4 by Sven Tennie at 2026-04-28T13:22:47-04:00
ghc: Distinguish between having an interpreter and having an internal one
Actually, these are related but different things:
- ghc can run an interpreter (either internal or external)
- ghc is compiled with an internal interpreter
Splitting the logic solves compiler warnings and expresses the intent
better.
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df691563 by Vladislav Zavialov at 2026-04-28T13:23:29-04:00
Refactor HsWildCardTy to use HoleKind (#27111)
The payload of this patch is that the extension fields of HsWildCardTy
and HsHole now match:
type instance XWildCardTy Ghc{Ps,Rn} = HoleKind
type instance XHole Ghc{Ps,Rn} = HoleKind
This is progress towards unification of HsExpr and HsType.
Test case: T25121_status
In addition to that, exact-printing of infix holes is fixed.
Test case: PprInfixHole
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f3485446 by fendor at 2026-04-28T13:24:12-04:00
Expose startupHpc as an rts symbol
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28f07d70 by fendor at 2026-04-28T13:24:12-04:00
Make HPC work with bytecode interpreter
Add support to generate .tix files from bytecode objects and the
bytecode interpreter.
Conceptually, we insert HPC ticks into the bytecode similar to how we insert
breakpoints.
HPC and breakpoints do not share the same tick array but we use a separate
tick-array for hpc/breakpoint ticks during bytecode generation.
We teach the bytecode interpreter to handle hpc ticks.
The implementation is quite trivial, simply increment the counter in the
global hpc_ticks array for the respective module.
This hpc_ticks array is generated as part of the `CStub`, so we can rely
on it existing.
A tricky bit is "registering" a bytecode object for HPC instrumentation.
In the compiled case, this is achieved via CStub and initializer/finalizers
`.init` sections which are called when the executable is run.
After the initializers have been invoked, which is before `hs_init_ghc`,
we then call `startup_hpc` in `hs_init_ghc` iff any modules were "registered"
for hpc instrumentation via `hs_hpc_module`.
Since bytecode objects are loaded after starting up GHCi, this workflow
doesn't work for supporting `hpc` and the `hpc` run-time is never
started, even if a module is added for instrumentation.
We fix this issue by employing the same technique as is for `SptEntry`s:
* We introduce a new field to `CompiledByteCode`, called `ByteCodeHpcInfo`
which contains enough information to call `hs_hpc_module`, allowing us to
register the module for `hpc` instrumentation`.
* After registering the module, we unconditionally call `startupHpc`, to make
sure the .tix file is written.
Calling `startupHpc` multiple times is safe.
Calling `hs_hpc_module` multiple times for the same module is also safe.
If we didn't register the hpc module in this way, evaluating a bytecode object
instrumented with `-fhpc` without registering it in the `hpc` run-time will
simply not generate any `.tix` files for this bytecode object.
However, this shouldn't happen if everything is set up correctly.
Closes #27036
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950879f0 by Vladislav Zavialov at 2026-04-28T13:24:55-04:00
Move NamespaceSpecifier from x-fields into the AST proper (#26678)
This refactoring moves NamespaceSpecifier out of extension fields and into the
AST proper, as it is part of the user-written source, and is not pass-specific.
Summary of changes:
* Move NamespaceSpecifier from GHC/Hs/Basic.hs to Language/Haskell/Syntax/ImpExp.hs
and parameterise it by the compiler pass, creating the necessary extension points
* Move NamespaceSpecifier out of XFixitySig into FixitySig
* Move NamespaceSpecifier out of XIEThingAll (IEThingAllExt) into IEThingAll
* Move NamespaceSpecifier out of XIEWholeNamespace (IEWholeNamespaceExt) into IEWholeNamespace
This is a pure refactoring with no change in behaviour.
- - - - -
9797052b by Simon Peyton Jones at 2026-04-28T13:25:37-04:00
Fix assertion check in checkResultTy
As #27210 shows, the assertion was a little bit too eager.
I refactored a bit by moving some code from GHC.Tc.Gen.App
to GHC.Tc.Utils.Unify; see the new function tcSubTypeApp,
which replaces tcSubTypeDS
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9f85f034 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Make cmm 'import "package" name;' syntax use consistent label types
There is a little-used syntactic form in cmm imports:
import "package" foo;
Which means to import foo from the given package (unit id, specified as
a string). This syntax is somewhat reminiscent of GHC's package import
extension.
This syntax form is not used in the rts cmm code, nor any of the boot
libraries. It may not be used at all. Unclear.
Change the kind of CLabel this syntax generates to be consistent with
the others. The other cmm imports use ForeignLabel with
ForeignLabelInExternalPackage. For some reason this form was using
CmmLabel. Change that to also be ForeignLabel but with
ForeignLabelInPackage. This specifies a specific package, rather
than an unnamed external package.
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a811f68f by Duncan Coutts at 2026-04-30T04:52:42-04:00
Change default cmm import statements to be internal
Previously a cmm statement like:
import foo;
meant to expect the symbol from a different shared library than the
current one.
Now it means to expect the symbol from the same shared library as the
current one. We'll add explicit syntax to indicate that it's a foreign
import. Most existing uses are in fact intenal (rts to rts), so few
imports will need to be annotated foreign. Examples would include cmm
code in libraries (other than the rts) that need to access RTS APIs.
In practice, this makes no difference whatsoever at the moment on any
platform other than windows (where building Haskell libs as shared libs
does not fully work yet), since the 'labelDynamic' treats all such
labels as foreign, irrespective of the foreign label source.
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17fe5d1d by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm import syntax 'import DATA foo;' as better name for CLOSURE
The existing syntax is:
import CLOSURE foo;
The new syntax is
import DATA foo;
This means to interpret the symbol foo as refering to data (i.e. a
global constant or variable) rather than to code (a function). The
historical syntax for this uses CLOSURE, which is rather misleading.
Presumably this was done to avoid introducing new reserved words.
Be less squemish about new reserved words and add DATA and use that.
Keep the existing CLOSURE syntax as an alias for compatibility.
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3a530d68 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm 'import extern name;' syntax
Since the default for cmm imports is now for symbols within the same
shared object, we need a way to indicate we want a symbol from an
external shared object:
import extern foo; -- for a function
import extern DATA foo; -- for data
This adds a new reserved word 'extern'.
We don't expect to have to use this much. Most cmm imports are
intra-DSO.
This makes no difference currently on ELF and MachO platforms, but does
make a difference to the linking conventions on PE (Windows).
In future it's plausible we could take make distinctions on ELF or
MachO, so it's worth trying to get it right. Windows can be the guinea
pig.
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2b8e44c7 by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add cmm syntax 'import "package" DATA foo;' for completeness
We already have:
import DATA foo; -- for data imports
import "package" foo; -- for imports from a given unitid
There's no reason not to have both at once:
import "package" DATA foo;
So add that.
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ee05e5cc by Duncan Coutts at 2026-04-30T04:52:42-04:00
Improve the commentary for the cmm import grammar.
AFAIK, this is the only place where GHC-style Cmm syntax is documented.
- - - - -
b35946ad by Duncan Coutts at 2026-04-30T04:52:42-04:00
Add a changelog.d entry for the .cmm import syntax changes
- - - - -
d59b7c71 by Wolfgang Jeltsch at 2026-04-30T04:53:25-04:00
Move code that uses `GHC.Internal.Text.Read` into `base`
This contribution serves to remove all dependencies on
`GHC.Internal.Text.Read` from within `ghc-internal`, so that the
implementation of `Text.Read` and ultimately more reading-related code
can be moved to `base` as well.
The following things are moved from `ghc-internal` to `base`:
* I/O-related `Read` instances
* Most of the `Numeric` implementation
* The instance `Read ByteOrder`
* The `parseVersion` operation
* The `readConstr` operation
Metric Increase:
LinkableUsage01
T9198
T12425
T13035
T13820
T18140
- - - - -
5bd6a964 by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00
New rts Message to {set,unset} TSO flags
This commit introduces stg_MSG_SET_TSO_FLAG_info and
stg_MSG_UNSET_TSO_FLAG_info, which allows setting flags of a TSO other
than yourself.
This is especially useful/necessary to set breakpoints and toggle
breakpoints of different threads, which is needed to safely implement
features like pausing, toggling step-out, toggling step-in per thread,
etc.
Fixes #27131
-------------------------
Metric Decrease:
T3294
-------------------------
- - - - -
ce97fd3e by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00
test: Add test setting another TSO's flags
Introduces a test that runs on two capabilities. The main thread running
on Capability 0 sets the flags on a TSO running on Capability 1.
The TSO from Capability 1 itself checks whether its flags were set and
reports that back.
This validates that the RTS messages for setting TSO flags work, even if
it doesn't test a harsher scenario with race conditions to exercise why
the message passing is necessary for safely setting another TSO's flags.
Part of #27131
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a4ff6315 by David Eichmann at 2026-04-30T04:54:51-04:00
Hadrian: withResponseFile outputs response file when verbodity is Verbose
At the Verbose verbosity, shake will display full commandlines. With the
use of response files, the full command is hidden. That makes it hard to run
the command manually. This commit outputs the contents of the response
file so that that full command can be recreated and also hints at the
use of the --keep-response-files hadrian flag.
- - - - -
cd732ee3 by Duncan Coutts at 2026-04-30T04:54:51-04:00
Use response files for hadrian linking with ghc (support long command lines)
In future support for windows dynamic linking, we expect long command
lines for linking dll files with ghc. Experiments with dynamic linking the
ghc-internal library yielded a link command well over 32kb. We did not
encounter this before for static libs, since we already use ar's @file
feature (if available, which it is for the llvm toolchain).
Co-authored-by: David Eichmann <davide(a)well-typed.com>
- - - - -
3d41368f by Andreas Klebinger at 2026-04-30T04:55:32-04:00
Split GHC.Driver.Main.hs up into multiple components.
This commit splits GHC.Driver.Main into four components:
* GHC.Driver.Main.Compile
* GHC.Driver.Main.Hsc
* GHC.Driver.Main.Interactive
* GHC.Driver.Main.Passes
We might improve that separation further in the future but this should
hopefully make it easier to reason about and work with this part of the
code.
- - - - -
2128ba85 by Cheng Shao at 2026-04-30T04:56:14-04:00
compiler: avoid unique OccNames for internal Names in bytecode objects
This patch improves bytecode object serialization logic by avoiding
the construction of unique `OccName`s when serializing/deserializing
internal `Name`s. Closes #27213.
-------------------------
Metric Decrease:
LinkableUsage01
-------------------------
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e16854c3 by Vladislav Zavialov at 2026-04-30T04:56:57-04:00
Replace GHC 9.16 references with GHC 10.0
- - - - -
39141343 by Alice Rixte at 2026-05-01T14:09:32+02:00
Add Bounded instances for Double, Float, CDouble and CFloat
- - - - -
5c4c3bf4 by Sylvain Henry at 2026-05-02T03:39:28-04:00
testsuite: fix flaky foundation Divisible / mulIntMayOflo# tests (#27222)
Since the LCG was widened to 64 bits and the seed randomised per CI run
(commit 2d30f7d3400 "Vendor mini-QuickCheck for testsuite"), two latent
bugs in the foundation test surface stochastically:
* The Divisible property `(x `div` y) * y + (x `mod` y) == x` raises
ArithException(Overflow) when (a, b) = (minBound, -1) for fixed-width
signed Integral types. Split testNumber/testDivisible into Bounded and
unbounded variants and skip just that one pair, gated by
`(minBound :: a) < 0` so unsigned types lose no coverage.
* The `mulIntMayOflo#` test compared raw Int# bit-for-bit, but the primop
is only specified to return 0/non-zero -- the exact non-zero indicator
legitimately differs between backends and inlining choices. Add a
dedicated `testPrimopMayOflo` helper that only compares zero / non-zero.
Also fix the long-standing typo "Dividible" -> "Divisible" in identifiers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
e242ce4f by Sylvain Henry at 2026-05-02T03:39:28-04:00
testsuite: catch and display exceptions in MiniQuickCheck
Exceptions raised while evaluating a property are now caught and reported
as a normal failure (with arguments and seed), instead of aborting the
test.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
3b75cccd by fendor at 2026-05-02T03:40:14-04:00
Fix name of Note [Structure of dep_boot_mods]
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9a9ae4df by Duncan Coutts at 2026-05-05T14:44:37-04:00
Use __attribute__((dllimport)) for external RTS symbol declarations
This is needed to be hygenic about DLL symbol imports and exports.
The attribute is ignored on platforms other than Windows.
Use of the attribute however means that external data symbols do not
have a compile-time constant address (they are loaded using an
indirection). This means we have to adjust the rtsSyms initial linker
table so that it is a local constant in a function, rather than a global
constant. We now define it within a function that pre-populates the
symbol table with the RTS symbols.
- - - - -
2ad3e01e by Duncan Coutts at 2026-05-05T14:44:37-04:00
Fix the rts linker declarations for a few data symbols
and ensure that the (windows only) rts_IOManagerIsWin32Native data
symbol is marked as externally visible.
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8ff4fdb5 by David Eichmann at 2026-05-05T14:44:37-04:00
Hadrian: Disable runtime pseudo relocations for RTS on windows hosts
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96974723 by Teo Camarasu at 2026-05-05T14:45:20-04:00
ghci/TH: refactor to use IORef QState
This is a pure refactor and shouldn't modify semantics at all
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eff6bfaf by Teo Camarasu at 2026-05-05T14:45:20-04:00
iserv: recover/getQ/putQ should behave same as internal interpreter
The internal and external interpreter should behave the same when
handling `recover`, the exeception recovery method of Q.
In practice, they diverge. In case of failure, the internal interpreter
only restores error message state to before the computation, wheras the
external interperter restores error message state *and* the state of putQ/getQ.
As far as I can tell this is a simple mistake in the implementation.
Note [TH recover with -fexternal-interpreter] describes the correct
behaviour but the implementation doesn't mirror this.
This change restores the correct behaviour by keeping the effects of
putQ in the erroring computation.
This is a breaking change since it modifies the behaviour of programs
that rely on recover ignoring putQ from failling computations when used
with the external interpreter. Although I highly doubt anyone relies on
this behaviour.
This divergence was first introduced in d00c308633fe7d216d31a1087e00e63532d87d6d.
As far as I can tell this was unintentional and tha commit was trying to solve a different bug.
Resolves #27022
- - - - -
1cb1d672 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add dynamic trace flags API
This commit adds an API to the RTS (exposed via Rts.h) that allows users to dynamically change the trace flags.
Prior to this commit, users were able to stop and start the profiling and heap profiling timers (via startProfTimer/stopProfTimer and startHeapProfTimer/stopHeapProfTimer).
This extends that functionality to also cover the core event types.
The getTraceFlag/setTraceFlag functions read and write the values of the trace flag cache, which is allocated by Trace.c, rather than modifying the members of RtsFlags.TraceFlags.
This is done under the assumption that the members of RtsFlags should not be modified after RTS initialisation.
Consequently, if the user modifies the trace flags using setTraceFlag, the object returned by getTraceFlags (from base) will not reflect these changes.
The trace flags are not protected by locks of any sort.
Hence, these functions are not thread-safe.
However, the trace flags are not modified by the RTS after initialisation, only read, so the race conditions introduced by one user modifying them are most likely benign.
This PR also puts the trace flag cache in a single global struct, as opposed to a collection of global variables, and changes the types of the individual flags from uint8_t to bool, as these have the same size on both Clang and GCC and are a better semantic match.
Prior to the change to uint8_t, they had type int, see 42c47cd6.
Even with its deprecation in C23, I don't think there should be any issue depending on stdbool.h.
The TRACE_X macros are redefined to access the global struct, with values cast to const bool to ensure they are read-only.
- - - - -
9d54dc94 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Ensure TRACE_X values are used in place of RtsFlags.TraceFlags.X
- - - - -
418d737b by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Fix nonmoving-GC tracing
The current nonmoving-GC tracing functions were written in a different
style from the other tracing functions. They were directly implemented
as, e.g., a traceConcMarkEnd function that called postConcMarkEnd.
The other tracing functions are implemented as, e.g., traceThreadLabel_,
a function that posts the thread label event, and traceThreadLabel, a
macro that checks whether TRACE_scheduler is set. This commit fixes that
implementation, and ensures that the nonmoving-GC tracing functions only
emit events if nonmoving-GC tracing is enabled.
- - - - -
99f4afa4 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add SymI_HasProto for get/setTraceFlag
- - - - -
7e9eb8b9 by Wen Kokke at 2026-05-06T09:53:40-04:00
rts: Add SymI_HasProto for start/endEventLogging
- - - - -
3a3045fb by Wen Kokke at 2026-05-06T09:53:41-04:00
rts: Add changelog entry
- - - - -
a3b339a4 by Teo Camarasu at 2026-05-06T09:54:25-04:00
interface-stability/base: don't distinguish ws-32
The interface of base is identical when the Word size is 32bits.
Therefore, there is no need to have another file for this case.
So, we delete it.
Step towards: #26752
- - - - -
eb922183 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Add a rts posix FdWakup utility module
This will be used to implement wakeupIOManager for in-RTS I/O managers.
It provides a notification/wakeup mechanism using FDs, suitable for
situations when a thread is blocked on a set of fds anyway. It uses the
classic self-pipe trick, or equivalently eventfd on supported platforms.
This will initially be used to implement prompt interrupt or shutdown of
the posix ticker thread.
- - - - -
01b0e233 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Add prompt shutdown to the pthread ticker implementation.
The Linux timerfd ticker monitors a pipe which is used by exitTicker to
ensure a prompt wakeup and shutdown. The pthread ticker lacked this and
so would only exit at the next ticker wakeup (10ms by default).
This patch adds the same mechanism to the pthread ticker.
This changes the pthread ticker from waiting by using nanosleep() to
waiting using either ppoll() or select(), so that it can wait on both
a time and a file descriptor. On Linux at least, a test program to
compare the timing jitter of these APIs shows that using nanpsleep,
ppoll or select makes no statistical difference to the maximum or
average jitter.
This is a step towards unifying the posix ticker implementations, so
that we can have just one portable one (albeit with some limited cpp).
It is also a step towards using the ticker as part of a more general
implementation of wakeUpRts, since this will require a method to wake
the rts from a signal handler context (ctl-c handler).
- - - - -
bc41d646 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Update ticker header commentary
It was antique and didn't apply even to the previous implementation, and
certainly not to the updated one.
- - - - -
4ed9a386 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Remove the timerfd-based ticker implementation
There does not appear to be any remaining advantage on Linux to using
the timerfd ticker implementation over the portable one (using ppoll on
Linux for precise timing).
The eventfd implementation was originally added at a time when Linux was
still using a signal based implementation. So it made sense at the time.
See (closed) issue #10840.
- - - - -
97504fa6 by Duncan Coutts at 2026-05-07T14:28:50+01:00
Consolidate to a single posix ticker implementation
Previously we had four implementations, two using signals and two using
threads. Having just one should make behaviour more consistent between
platforms, and should make maintenance easier.
- - - - -
1e60023b by Facundo Domínguez at 2026-05-07T18:01:16-04:00
Generalize so_inline to specify which bindings should be preserved
This commit generalizes the so_inline option of the simple optimizer
so we can indicate with a predicate the specific bindings that should
be kept.
This feature is important for the LiquidHaskell plugin, which relies on the
simple optimizer to make core programs easier to read, but needs to preserve
bindings that are relevant for verification.
See https://gitlab.haskell.org/ghc/ghc/-/issues/24386 for the full discussion.
- - - - -
44cf9cd7 by Wolfgang Jeltsch at 2026-05-12T09:48:18-04:00
Move the `Text.Read` implementation into `base`
- - - - -
4ac3f7d6 by Vladislav Zavialov at 2026-05-12T09:49:03-04:00
EPA: Use AnnParen for tuples and sums
Summary of changes
* Do not use AnnParen in XListTy, replace it with EpToken "[" and "]"
* Specialise AnnParen to tuple/sums by dropping the AnnParensSquare
and keeping only AnnParens and AnnParensHash
* Use AnnParen in XExplicitTuple
* Use AnnParen in XExplicitTupleTy
* Use AnnParen in XTuplePat
* Use AnnParen in XExplicitSum (via AnnExplicitSum)
* Use AnnParen in XSumPat (via EpAnnSumPat)
This is a refactoring with no user-facing changes.
- - - - -
1bdcddec by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add minimal dlltool support to ghc-toolchain
The dlltool is a tool that can create dll import libraries from .def
files. These .def files list the exported symbols of dlls. Its somewhat
like gnu linker scripts, but more limited.
We will need dlltool to build the rts and ghc-internal libraries as DLLs
on Windows. The rts and ghc-internal libraries have a recursive
dependency on each other. Import libraries can be used to resolve
recursive dependencies between dlls. We will use an import library for
the rts when linking the ghc-internal library.
- - - - -
f7fc3770 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add minimal dlltool support into ./configure
Find dlltool, and hopefully support finding it within the bundled llvm
toolchain on windows.
- - - - -
e4e22bfb by Duncan Coutts at 2026-05-12T09:49:48-04:00
Update the default host and target files for dlltool support
- - - - -
5666c8f9 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add dlltool as a hadrian builder
Optional except on windows.
- - - - -
5e14fe3f by Duncan Coutts at 2026-05-12T09:49:48-04:00
Update and generate libHSghc-internal.def from .def.in file
The only symbol that the rts imports from the ghc-internal package now
is init_ghc_hs_iface. So the rts only needs an import lib that defines
that one symbol.
Also, remove the libHSghc-prim.def because it is redundant. The rts no
longer imports anything from ghc-prim.
Keep libHSffi.def for now. We may yet need it once it is clear how
libffi is going to be built/used for ghc.
- - - - -
3d91e4a6 by Duncan Coutts at 2026-05-12T09:49:48-04:00
Add rule to build libHSghc-internal.dll.a and link into the rts
On windows only, with dynamic linking.
This is needed because on windows, all symbols in dlls must be resolved.
No dangling symbols allowed. References to external symbols must be
explicit. We resolve this with an import library. We create an import
library for ghc-internal, a .dll.a file. This is a static archive
containing .o files that define the symbols we need, and crucially have
".idata" sections that specifies the symbols the dll imports and from
where.
Note that we do not install this libHSghc-internal.dll.a, and it does
not need to list all the symbols exported by that package. We create a
special purpose import lib and only use it when linking the rts dll, so
it only has to list the symbols that the rts uses from ghc-internal
(which is exactly one symbol: init_ghc_hs_iface).
- - - - -
c8dae539 by Alice Rixte at 2026-05-12T09:50:52-04:00
Script for downloading and copying `base-exports` file
- - - - -
5fab2238 by Wolfgang Jeltsch at 2026-05-12T21:24:27+03:00
Introduce a cache of home module name providers
This contribution introduces to the module graph a cache that maps home
module names to sets of units providing them and changes the finder to
use that cache. This is a performance optimization, especially for
multi-home-unit builds.
The particular changes are as follows:
* In `GHC.Unit.Module.Graph`, `ModuleGraph` is extended with a new
field `mg_home_module_name_providers_map`, exposed as
`mgHomeModuleNameProvidersMap`. This is a cache that assigns to each
home module name the set of IDs of home units that define it.
Operations that construct module graphs are updated such that this
cache stays synchronized.
* In `GHC.Unit.Finder`, `findImportedModule` is changed to pull
`mgHomeModuleNameProvidersMap` from `hsc_mod_graph` and pass it to
`findImportedModuleNoHsc`, which now does not search home units in
arbitrary order but prioritizes those units that the cache mentions
as potential providers of the requested module.
In addition, this contribution adds variants of the two multi-component
compiler performance tests that use 100 units instead of 20, because
with just 20 units the benefits from caching of home module name
providers are still negligible.
The following table shows the total time needed for running both
multi-component tests before and after this contribution and with
different numbers of units:
| # of units | Before | After |
|-----------:|-------:|------:|
| 20 | 0:12 | 0:12 |
| 100 | 0:47 | 0:42 |
| 200 | 3:05 | 2:08 |
Note that there seems to be a general overhead of 12 seconds that is not
attributable to the actual tests, so that the real running times should
be 12 seconds smaller than shown above.
Resolves #27055.
Metric Decrease:
MultiComponentModules
MultiComponentModulesRecomp
Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com>
Co-authored-by: Fendor <fendor(a)posteo.de>
- - - - -
38b76b2f by Cheng Shao at 2026-05-13T17:48:48-04:00
testsuite: mark T22159 as fragile
This patch marks T22159 as fragile on Windows for issue described in #27248.
Before we get to the bottom of those failures, this unblocks newer
Windows runners.
- - - - -
50188615 by Ian Duncan at 2026-05-14T13:45:07+02:00
AArch64: use ASR not LSR for MO_U_Shr at W8/W16
The unsigned right shift (MO_U_Shr) for sub-word widths (W8, W16)
with a variable shift amount was emitting ASR (arithmetic/signed shift
right) after zero-extending with UXTB/UXTH. This should be LSR
(logical/unsigned shift right). After zero-extension the upper bits
happen to be 0 so ASR produces the same result, but it is semantically
wrong and would break if the zero-extension were ever optimized away.
Includes assembly output test (grep for lsr) and runtime test
verifying unsigned right shift of Word8 and Word16 values.
- - - - -
28666fbf by Vladislav Zavialov at 2026-05-19T12:44:05-04:00
Add type families: Tuple, Constraints, Tuple#, Sum# (#27179)
These type families map tuples of types to the corresponding Tuple<N>,
Tuple<N>#, CTuple<N>, and Sum<N># types. Some examples at N=2:
Tuple (Int, Bool) = Tuple2 Int Bool
Constraints (Show a, Eq a) = CTuple2 (Show a) (Eq a)
Tuple# (Int#, Float#) = Tuple2# Int# Float#
Sum# (Int#, Float#) = Sum2# Int# Float#
See GHC Proposal #145 "Non-punning list and tuple syntax".
To make the Sum# instance at N=64 possible, this patch also introduces
the Sum64# constructor declaration and bumps mAX_SUM_SIZE from 63 to 64.
Metric Increase:
ghc_experimental_dir
- - - - -
41c2448b by Wen Kokke at 2026-05-19T12:44:53-04:00
rts: Add IPE event class for -l
This commit adds a new IPE event class to the -l RTS flag.
Previously, IPE events were enabled unconditionally.
However, the IPE events can easily grow to hundreds or thousands of megabytes.
With the new event class you can pass, e.g., -l-I to disable IPE events.
- - - - -
62536551 by Wen Kokke at 2026-05-19T12:44:53-04:00
ghc-internal: Add TraceFlags.traceIPE
- - - - -
e45312d1 by Wen Kokke at 2026-05-19T12:44:53-04:00
testsuite: Add test for TraceFlags.traceIpe
- - - - -
4768d9aa by Wen Kokke at 2026-05-19T12:44:53-04:00
ghc-internal: Add DebugFlags.ipe
- - - - -
bc1b5c69 by Wen Kokke at 2026-05-19T12:44:53-04:00
testsuite: Add test for DebugFlags.ipe
- - - - -
0da1543f by Duncan Coutts at 2026-05-19T12:45:37-04:00
Document removal of the signal-based interval timer
Update mentions within the RTS section of the users guide.
Add a changelog entry.
- - - - -
b2911514 by Duncan Coutts at 2026-05-19T12:45:37-04:00
Fix section for an recent changelog entry
- - - - -
d6d76a7a by David Eichmann at 2026-05-19T12:46:19-04:00
ghc-toolchain: implement llvm program versioning logic
- - - - -
2dd36fa3 by Wolfgang Jeltsch at 2026-05-20T04:49:52-04:00
Turn `Trustworthy` into `Safe` in `base` where possible
- - - - -
f4399dd1 by Wolfgang Jeltsch at 2026-05-20T04:50:37-04:00
Make the current `base` buildable with GHC 10.0
- - - - -
1a7de232 by Duncan Coutts at 2026-05-20T12:26:25-04:00
Hadrian: remove legacy rts .so symlinks
For compatibility with the old makefile based build system, hadrian had
rules to generate symlinks from unversioned to versioned names for the
rts .so/.dynlib file, like libHSrts-ghcx.y.so -> libHSrts-1.0.3-ghcx.y.so
We no longer need these symlinks since the makefile build system has
been retired some time ago. The need for these symlinks is awkward on
windows where we cannot (in practice) create symlinks. So rather than
make them conditional (non-windows), just remove them entirely.
- - - - -
286f1adf by fendor at 2026-05-20T12:27:09-04:00
Fix regression T27202: `:load` and `:add` work in GHCi
To fix the regression there are conceptually two major things that we
fix:
* We don't remove the `importDirs` from `interactive-session`
* When `:add`ing a module, we don't try to find them via PackageImports
* The PackageImport is wrong as we can't know the package-name at
this stage in ghc/UI.hs
What does it mean to not remove the `importDirs` from
`interactive-session`?
It means that, given some initial `DynFlags`, we will use those
`importDirs` in `interactive-session`.
The initial `DynFlags`, however, depend on how you initialise the GHC
session.
For a simple session, initialised by
ghc -isrc -this-unit-id main
It is simple, just use the `DynFlags` given on the cli.
Thus, `main` and `interactive-session` will have the same `DynFlags`,
except for the `homeUnitId` and `interactive-session` depends on `main`
by construction of the GHCi session.
What about a multiple home unit session, though?
ghc -unit @unit1 -unit @unit2
What are the `DynFlags` in this cli invocation? It shouldn't be either
`@unti1` nor `@unit2`, as the order shouldn't matter or any other
implicit condition.
For consistency, we decide that the initial `DynFlags` are the top
`DynFlags` on the cli, ignoring `-unit` flags.
Thus, in this example, there are no `importsDirs` regardless of what we
might find in `@unit1` and `@unit2`.
But in this invocation:
ghc -isrc -unit @unit1 -unit @unit2
The `interactive-session` will have the `importsDirs` `src`.
Note, `-isrc` will be inherited in `@unit1` and `@unit2`, so you need to
explicitly use `-i` to clear the `importsDirs`, in order to avoid
accidentally adding `src` as an import directory to all other home
units.
This fix has been made possible by the improvements introduced in
!15888, which avoids ambiguity when a home unit shares the `importsDirs`
with the `interactive-session`, on top of being much faster for multiple
home units.
Adds regression tests for T27202 for `:load`ing and `:add`ing modules
that are located in import directories.
- - - - -
728662de by fendor at 2026-05-20T12:27:09-04:00
Use home unit package db stacks in GHCi prompt and session unit
In order to import modules from home unit dependencies (e.g., `Data.Map`),
the ghci prompt unit needs to populate its `UnitState`.
This is tricky to handle correctly, which `PackageDBFlag`s should we use
to populate the `UnitState`?
We decide, the most intuitive solution for users is to depend on all
`PackageDBFlag`s, so that any dependency can be imported in GHCi.
This assumes consistency in the `PackageDBFlag`s, so no two home units
specify `PackageDBFlag`s that are inconsistent with each other.
We could simply concat all the `PackageDBFlag`s of the existing home
units, but later `PackageDBFlag`s shadow earlier ones, leading to the
last processed home units' `PackageDBFlag`s to shadow the earlier ones.
This is hard to fix, we need to give users the capability to provide ghc
options for the ghci prompt home unit.
However, as this is considerably more work, we decided on an
approximation that should work out most of the time.
Package Db stacks in cabal and stack follow a certain structure:
-no-user-package-db > -package-db $cabal-store > -package-db $local-db
The first two arguments are always the same, namely the
`-no-user-package-db` and `-package-db`.
We compute the longest common prefix over all home units, and use that
as the start of the package db stack. Then, over the rest of the
`PackageDBFlag`s, we simply take the union and append them to our
initial stack.
We assume, that the rest of package dbs only defines very few, "local"
units that are usually not shadowing each other.
This allows us to get a relatively consistent package database stack for
the ghci prompt home unit.
Similar reasoning applies to the session unit in order to add modules to
the session and have dependencies available in the module.
We do something similar for `-package` flags, to make sure only the
correct units are actually visible in the ghci session.
This time, we simply take the union of all `PackageFlag`s, allowing us
to import modules from the home unit dependencies.
In the future, it would be beneficial to allow the user to provide the
exact ghc options to control the visibilities. For now, this will have
to do.
- - - - -
740d89a0 by Simon Peyton Jones at 2026-05-20T17:20:44-04:00
Do not use mkCast during typechecking
This commit fixes #27219. The problem was that the typechecker was using
`mkCast`, whose assertion checks legitimately fail when applied to types
that contain unification variables.
- - - - -
a50fdb06 by Simon Peyton Jones at 2026-05-20T17:20:45-04:00
Major refactor of the Simplifier
The main payload of this patch is to refactor the Simplifer to avoid
repeated simplification when using Plan (AFTER) for rule rewrites.
The need for this was shown up by #26989.
See Note [Avoid repeated simplification] in GHC.Core.Opt.Simplify.Iteration.
Related refactoring:
* Refactor the two fields `sc_dup` and `sc_env` in `ApplyToVal` into one, `sc_env`.
Reason: the envt is irrelevant in the "simplified" case, so the data type describes
the possiblitiies much more accurately now.
* Some refactoring in `knownCon` to split off `wrapDataConFloats`.
* Refactor `lookupRule` and its auxiliary functions to return `RuleMatch`,
a new data type. See Note [data RuleMatch] in GHC.Core. Ditto for BuiltinRule.
This RuleMatch returns fragments of the target in rm_args and rm_floats,
leaving `rm_rhs` to be the stuff from the RULE itself.
Doing this has routine consequences in GHC.Core.Opt.ConstantFold. Many changes
there but all routine.
* When doing occurrence analysis on RULEs, make the occ-info on the rule
binders relate just to the RHS, not the LHS. See (OUR1) in
Note Note [OccInfo in unfoldings and rules]
This means that Lint must not complain about the fact that the patterns
in the RULE mentions binders that are marked dead.
See Note [Dead occurrences] in GHC.Core.Lint.
I changed the Core pretty-printer so that it didn't suppress dead binders,
else I can't see those binders in RULEs. That led to quite a lot of testsuite wibbles.
* Refactor FloatBinds, so that it is used both by
`exprIsConApp_mabye` and by `lookupRule`
* Move the definition of FloatBinds out of GHc.Core.Make, into GHC.Core.
* Add FloatTick as an extra constructor.
* Refactor `lookupRule` to use `FloatBinds` instead of `BindWrapper`.
This refactor just shares more code.
(Rename GHC.Core.Opt.FloatOut.FloatBinds to FloatLets, to avoid gratuitious
name clash with GHC.Core.FloatBinds.)
Corecion optimisation
* In simpleOpt, when composing coercions, call new function `optTransCo`.
This is much lighter weight than full blown coercion optimisation.
* Make `GHC.Core.Opt.Arity.pushCoValArg` and `pushCoTyArg` return the
coercionLKind of the coercion. This saves recomputing that coercionLKind
at the key call sites in GHC.Core.Opt.Simplify.Iteration.pushCast.
* Rename `addCoerce` in GHC.Core.Simplify.Iteration to become `pushCast`.
* In the `ApplyToVal` case of `pushCast` we had a very unsavoury call to `simplArg`.
I eliminated it by adding a field `sc_cast` to `ApplyToVal` that records any
pending casts. Much nicer now. See Note [The sc_cast field of ApplyToVal].
* Don't optimise coercions if the type-substitution is empty.
See Note [Optimising coercions] in GHC.Core.Opt.Simplify.Iteration.
The fix for #26838 is dramatic. For the test in perf/compiler/T26839 we have
Compiler allocs: Before: 7,363M
After: 688M
Compile time goes down generally. Here are compiler-alloc changes
over 0.5%:
CoOpt_Read(normal) 729,184,920 -0.7%
CoOpt_Singletons(normal) 666,916,960 -4.6% GOOD
LargeRecord(normal) 1,227,056,876 +1.1%
T12227(normal) 256,827,604 -4.6% GOOD
T12425(optasm) 76,879,410 -0.8%
T12545(normal) 787,826,918 -10.8% GOOD
T12707(normal) 775,186,464 -0.9%
T13253(normal) 318,599,596 -0.8%
T14766(normal) 685,857,320 -1.0%
T15304(normal) 1,123,333,422 -2.2%
T15630(normal) 123,142,330 -2.6%
T15630a(normal) 123,092,100 -2.6%
T15703(normal) 299,751,682 -2.9% GOOD
T17516(normal) 964,072,280 +1.0%
T18223(normal) 367,016,820 -6.2% GOOD
T18730(optasm) 130,643,770 -3.3% GOOD
T20261(normal) 535,608,584 -0.7%
T21839c(normal) 340,340,436 -0.9%
T24984(normal) 85,568,392 -1.9%
T3064(normal) 174,631,992 -1.2%
T3294(normal) 1,215,886,432 -0.7%
T5030(normal) 141,449,704 -17.2% GOOD
T5321Fun(normal) 258,484,744 -1.9%
T8095(normal) 770,532,232 -2.7%
T9630(normal) 858,423,408 -14.5% GOOD
T9872c(normal) 1,591,709,448 +0.7%
info_table_map_perf(normal) 19,700,614,458 -1.3%
geo. mean -0.7%
minimum -17.2%
maximum +1.1%
However, strangely there seems to be a 5.0% increase in CoOpt_Read in
the x86_64-linux-fedora43-validate+debug_info+ubsan job, although
there generally a /decrease/ in this test in other builds. The baseline
value looks strange. Anyway I'll just accept it.
Metric Decrease:
CoOpt_Singletons
T12227
T12545
T12707
T15703
T18223
T18730
T21839c
T5030
T9630
Metric Increase:
CoOpt_Read
- - - - -
834623d4 by Mrjtjmn at 2026-05-20T17:21:41-04:00
users-guide: Fix weird notation in "Summary of stolen syntax"
- - - - -
6f9d7c71 by Markus Läll at 2026-05-21T15:25:34-04:00
Use "grimily" instead of "grimly"
Fixes https://gitlab.haskell.org/ghc/ghc/-/issues/27221
- - - - -
50e999ca by fendor at 2026-05-21T15:26:18-04:00
Speed up 'closure' computation in `ghc-pkg`
Cache the set of already seen `UnitId`s and use `Set` operations to
speed up 'closure' computation.
Further simplify the implementation of 'closure' to account for the
actual usage.
As a consequence, we rename 'closure' to 'brokenPackages' to reflect its
purpose better after the simplification.
- - - - -
7ecc6184 by sheaf at 2026-05-21T15:27:10-04:00
TcMPluginHandling: be more lenient when no plugins
This change ensures that, if a function such as 'typecheckModule' was
invoked with 'NoTcMPlugins', GHC doesn't spuriously complain about TcM
plugins having already been stopped, as there were none to start with.
- - - - -
72c8de5c by Simon Jakobi at 2026-05-23T18:41:42-04:00
Implement List.elem via foldr
...in order to allow specialization to Eq instances.
The implementation of notElem is updated for consistency.`
Corresponding CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/412
Addresses #27096.
- - - - -
3268c610 by Alan Zimmerman at 2026-05-23T18:42:30-04:00
EPA: Fix span for qualified multiline string
Fix the span for a qualified multiline string like
Text."""
I'm a multiline
Text value
!
"""
to extend to the end of the entire string, not just the first line.
Closes #27274
- - - - -
1f096790 by Alan Zimmerman at 2026-05-23T18:43:20-04:00
EPA: Fix exact printing namespace-specified wildcards
Ensures correct printing of imports of the form
import Data.Bool (data True(data ..))
import Data.Bool (data True(type ..))
Closes #27291
- - - - -
56ada7c0 by Mrjtjmn at 2026-05-23T18:44:19-04:00
Fix ambiguous syntax of BangPatterns in users guide
Update documentation for the BangPatterns extension to specify
how surrounding whitespace affects interpretation of `!`.
* Only when there is whitespace before `!` and no whitespace after,
it is recognized as a BangPattern.
* Other cases `⟨varid⟩!⟨varid⟩`, `⟨varid⟩ ! ⟨varid⟩`, `⟨varid⟩! ⟨varid⟩`
are treated as infix operators.
- - - - -
579aa0b7 by Simon Jakobi at 2026-05-25T16:31:26-04:00
Ensure that SetOps.{minusList,unionListsOrd} can be specialized
...by marking them INLINABLE. Haddock allocates 0.1–0.3% less as a
result.
This also removes some redundant constraints on unionListsOrd.
- - - - -
cccf45da by Cheng Shao at 2026-05-25T16:32:13-04:00
wasm: ensure post-linker output is synchronous ESM
This patch fixes wasm backend's post-linker output script to ensure
it's synchronous ESM and doesn't use top-level await, which doesn't
work in ServiceWorkers. Fixes #27257.
- - - - -
8db331a3 by Zubin Duggal at 2026-05-26T04:54:03-04:00
Update to semaphore-compat 2.0.0 using v2 of the protocol
On Linux and other POSIX platforms, GHC's -jsem jobserver client now
speaks v2 of the semaphore-compat protocol, which uses Unix domain
sockets in place of POSIX named semaphores. This avoids the libc-ABI
issues that affected the old implementation. Windows is unaffected
and continues to use the v1 protocol (Win32 named semaphores); its
reported protocol version remains v1.
When GHC receives a -jsem name whose protocol version it does not
support, it emits a -Wsemaphore-version-mismatch warning and falls
back to -j<N> rather than crashing. ghc --info exposes the supported
version in a new "Semaphore version" entry so cabal-install can detect
a mismatch before invoking GHC.
Users on a cabal-install that predates the v2 update will continue to
build successfully on Linux/POSIX, but will lose the cross-process
-jsem coordination and fall back to -j<N> per GHC invocation. Users
must upgrade to a cabal-install that supports protocol v2 to recover
full parallelism.
Also fix a leak in cleanupSem (#27253): cleanupSem used to snapshot
heldTokens and release them before killing the loop, while the loop's
in-flight acquire/release children could still be mutating it.
Cleanup now runs inside the loop's own exit handler, after draining
the active child via a new activeChild TVar, so the snapshot has no
concurrent mutator.
See also:
- GHC proposal amendment: https://github.com/ghc-proposals/ghc-proposals/pull/673
- cabal-install patch: https://github.com/haskell/cabal/pull/11628
- semaphore-compat MR: https://gitlab.haskell.org/ghc/semaphore-compat/-/merge_requests/8
Bump semaphore-compat submodule to 2.0.0
Fixes #25087 and #27253
- - - - -
17be4f1f by Alan Zimmerman at 2026-05-26T04:54:52-04:00
EPA: Record semicolons in HsModifier
Ensure the semi colons are captured in the ParsedSource for code like
%True;; %False;
instance C D
It makes HsModifier (and hence HsModifierOf) LocatedA, so the semi
colons can be recorded as [TrailingAnn]
Also rename pprHsModifiers to pprLHsModifiers to match.
Closes #27294
- - - - -
8f991755 by fendor at 2026-05-26T11:02:52-04:00
Revert prog003 acceptance
We thought the commit 286f1adff3e78d775ff325caff71d0cee25d710b fixed the
test, but due to changes to ghci, modules loaded during the GHCi
session, the test was actually no longer testing what it set out to do,
"fixing" the broken test.
As modules are added to the `interactive-session` home unit, the object code needs
to be compiled with `-this-unit-id interactive-session`, otherwise the
object code won't be used.
Once this has been fixed in the test, the test fails as expected again.
- - - - -
277a3687 by mangoiv at 2026-05-26T11:03:40-04:00
libraries/process: bump submodule to v1.6.29.0
This submodule bump resolves a segfault on macos 15.
Fixes #27144
- - - - -
6779bb0c by mangoiv at 2026-05-26T11:03:40-04:00
libraries/unix: in submodule, don't pick branch 2.7
The 2.7 branch is outdated and the module has been advanced far beyond
it anyway, so remove that line.
- - - - -
4a645683 by Simon Peyton Jones at 2026-05-27T21:41:59-04:00
Trim the continuation in mkDupableContWithDmds
When there are no remaining argument demands, it means the application
is bottoming. In this case, we can trim the continuation to avoid the
panic that was observed in #27261.
See Note [Trimming the continuation for bottoming functions] in
GHC.Core.Opt.Simplify.Iteration.
- - - - -
8ab506ff by Cheng Shao at 2026-05-27T21:42:47-04:00
ghci: fix module name string lifetime in hs_hpc_module invocation
This patch makes hpcAddModule pass a properly malloced module name
string to hs_hpc_module, instead of using useAsCString which causes
use-after-free of module name string. Fixes #27297.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
b0233814 by sheaf at 2026-05-27T21:43:31-04:00
Relax acceptance threshold for T10421
As seen in #27289, the 1% acceptance threshold for this text was
overly narrow, resulting in spurious test failures. This commit widens
the acceptance threshold to 2%. Fixes #27289.
- - - - -
63ce5770 by Luite Stegeman at 2026-05-28T12:23:35-04:00
Fixes for black holes
- suspend duplicate work for eager black holes
- detect eager black holes in checkBlockingQueues
- don't overwrite existing black holes even if they're not
in an eager blackhole frame
- don't deadlock on self when thunk is already blackholed
Fixes #26936
- - - - -
037a80dc by Tom McLaughlin at 2026-05-28T12:24:36-04:00
Event/Windows.hsc: rethrow exceptions in overlapped IO
This prevents the WinIO manager from swallowing exceptions in overlapped IO. It
was added to make WinIO support possible in the `network` library. See
https://gitlab.haskell.org/ghc/ghc/-/issues/27283.
We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP.
- - - - -
2d53bcdb by Wolfgang Jeltsch at 2026-05-28T12:25:21-04:00
Allow `downsweep` to use nodes of an existing module graph
To this end, `downsweep` has not been able to use the nodes of a module
graph obtained from a previous downsweeping round. In some GHC API
applications, downsweeping is performed somewhat incrementally and
therefore could profit from reusing such existing results. This
contribution makes this possible.
Resolves #27054.
Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com>
- - - - -
f4fbb583 by Simon Jakobi at 2026-05-28T12:26:04-04:00
Add regression test for T11226
Closes #11226.
- - - - -
ed29a5e6 by Sven Tennie at 2026-05-28T17:30:36-04:00
Add optional config setting for LibDir (#19174)
Previously, the `libDir` was derived from `topDir`. This won't work for
inplace stage2 cross-compilers where binaries and libraries are in
different stage dirs (`_build/stage1/` for executables and
`_build/stage2` for libraries).
`LibDir` is set in the inplace `settings` files. For bindists, we
generate a new `settings` file with no `LibDir` entry. GHC then defaults
to use `topDir` as `libDir` again. This keeps the bindist relocatable.
If `LibDir` is a relative path, it is interpreted relatively to
`topDir`.
The global package db is part of the `lib/` folder. If we want to point
for inplace cross-compilers to the succeeding stage's folder, this is
done by setting `LibDir`. Thus, the global package db must be found
relative to `libDir`` (which may default to `topDir` or be set by
`LibDir`).
The complexity of settings becomes scary. So, add a test to ensure
`LibDir` works as expected.
- - - - -
8339cf8f by Sven Tennie at 2026-05-28T17:30:36-04:00
Add Haddock to FileSettings
Helping to understand the fields' meanings without deeper analyses.
- - - - -
4ce251e4 by Sylvain Henry at 2026-05-28T17:31:39-04:00
foundation test: skip signed minBound `quot` (-1) (#27222)
`minBound `quot` (-1)` for fixed-width signed integers is platform
dependent: the mathematical result -minBound is not representable in
the type. On x86, IDIV traps; LLVM's sdiv is undefined behaviour in
this case; on AArch64/RISC-V, SDIV wraps to minBound.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
b8ba7e61 by Simon Jakobi at 2026-05-28T17:32:23-04:00
Prevent dictionary-passing in checkTyEqRhs
...by pre-specializing it to TcM.
Previously, wherever checkTyEqRhs was used in other modules, the
Core showed dictionary passing ($fMonadIOEnv). The added SPECIALIZE
pragma prevents this.
- - - - -
d603477f by David Eichmann at 2026-05-29T13:17:12-04:00
Hadrian: create a ghc-internal .def file per ghc-internal dll
The .def file generated from rts/win32/libHSghc-internal.def.in contains
the name of the ghc-internal dll. The correct dll name differs based
on if the dll is inplace/final and if using the Dynamic way. Previously,
this was not accounted for and inconsistent dlls names where used. That
led to failure when loading dlls at runtime in experiments with windows
dynamic linking.
- - - - -
1fc21753 by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: copy backend interface haddocks to Native backend (#27305)
The haddock comments documenting the BigNat backend interface (function
contracts, expected MutableWordArray# sizes, return-value semantics, etc.)
were attached to the FFI backend module. Copy them to the Native backend
so they remain in tree once the FFI backend is removed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
717059df by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: remove FFI backend (#27305)
The FFI backend of ghc-bignum (now part of ghc-internal) had no known
users and is easy to recreate by relinking ghc-internal with a custom
backend. Remove the backend module, the bignum-ffi cabal flag, and the
ffi option from Hadrian's --bignum selector. The backend interface
documentation now lives in the Native backend module.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
4bb3b1d8 by Sylvain Henry at 2026-05-29T13:18:14-04:00
ghc-bignum: remove Check backend (#27305)
The Check backend of ghc-bignum (now part of ghc-internal) compared the
selected backend's output against the Native backend for validation.
It had no known users. Remove the backend module, the bignum-check
cabal flag, the bignumCheck Hadrian flavour field, and the check-
prefix in Hadrian's --bignum selector.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com>
- - - - -
6b3044a0 by David Eichmann at 2026-05-30T11:58:48-04:00
Add code comments to allocator code
- - - - -
f4e04210 by Matthew Pickering at 2026-05-30T11:59:34-04:00
hadrian: Refactor system-cxx-std-lib rules
I noticed a few things wrong with the hadrian rules for
`system-cxx-std-lib` rules.
* For `text` there is an ad-hoc check to depend on `system-cxx-std-lib`
outside of `configurePackage`.
* The `system-cxx-std-lib` dependency is not read from cabal files.
* Recache is not called on the packge database after the `.conf` file is
generated, a more natural place for this rule is `registerRules`.
Treating this uniformly like other packages is complicated by it not
having any source code or a cabal file. However we can do a bit better
by reporting the dependency firstly in `PackageData` and then needing
the `.conf` file in the same place as every other package in
`configurePackage`.
This commit increases the `shakeVersion`, to provide backwards
compatibility to previous builds with different PackageData.
Fixes #25303
Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com>
- - - - -
576987d0 by Simon Jakobi at 2026-06-02T04:53:36-04:00
compiler: use nubOrd from containers
Address #27103 by replacing GHC.Utils.Misc.ordNub[On] with
Data.Containers.ListUtils.nubOrd[On].
Note that nubOrd suffers from a small inefficiency, a fix for which
will be included in the next containers release:
https://github.com/haskell/containers/issues/1202
- - - - -
deea53c3 by David Eichmann at 2026-06-02T04:54:22-04:00
Hadrian: disable response files for GHC/Haddock builders on non-Windows
This makes debugging build errors easier on non-windows hosts.
See issue #27230
- - - - -
f2f5c6ba by Nikita Efremov at 2026-06-02T16:04:54+00:00
fix typo : compete with performance, not complete
- - - - -
5524ea0e by Wolfgang Jeltsch at 2026-06-03T08:01:26-04:00
Make the current `base` buildable with GHC 9.14
This comprises the following changes:
* Disable some imports into `GHC.Base` for GHC 9.14
* Disable some imports into `Prelude` for GHC 9.14
* Disable separate `ArrowLoop` import for GHC 9.14
* Disable `GHC.Internal.STM` import for GHC 9.14
* Disable `GHC.Internal.Unicode.Version` import for GHC 9.14
* Disable `GHC.Internal.TH.Monad` import for GHC 9.14
* Add alternative `fixIO` import for GHC 9.14
* Add alternative `unsafeCodeCoerce` import for GHC 9.14
* Disable hiding of imported SIMD operations for GHC 9.14
* Disable use of GHC 9.14’s `printToHandleFinalizerExceptionHandler`
* Enable use of `getFileHash` from `ghc-internal` for GHC 9.14
* Make `thenA` available for GHC 9.14
* Make `thenM` available for GHC 9.14
* Disable translation of `IoManagerFlagPoll` for GHC 9.14
* Add `hGetNewlineMode` for GHC 9.14
- - - - -
d3438055 by Enrico Maria De Angelis at 2026-06-03T08:02:17-04:00
Fix #27067 - Clarify haddocks on `minusNaturalMaybe`
- - - - -
f9bcfac2 by sheaf at 2026-06-03T14:47:19-04:00
Avoid mkTick in Core Prep breaking ANF
As discovered in #27182, mkTick can break ANF. This patch introduces a
variant of mkTick that skips the single optimisation that could break
ANF. This is preferrable over switching to the raw Tick constructor,
as the latter may introduce spurious cost centres in profiling reports.
This is a temporary measure until we more thoroughly refactor how
mkTick works (see #27141).
See Note [mkTick breaks ANF] in GHC.CoreToStg.Prep.
Fixes #27182
- - - - -
cf1fd661 by Artem Pelenitsyn at 2026-06-03T14:48:09-04:00
clarify comment for getSizeofMutableByteArray#: we get the size in bytes, not "elements"
- - - - -
a3b431f3 by David Eichmann at 2026-06-04T10:10:19+00:00
Hadrian: convert env variable ACLOCAL_PATH to unix paths.
Convert ACLOCAL_PATH to a unix style path when invoking autoreconf.
Autoreconf doesn't handle windows paths.
See Note [Autoreconf unix paths from ACLOCAL_PATH].
Fixes #27311
- - - - -
18f6138a by Simon Jakobi at 2026-06-04T20:20:31-04:00
testsuite: Deduplicate --only test names
config.only is assumed to be a set, but supplying --only overwrote it
with the (list) argparse result, which can contain duplicates. When a
test ran, config.only.remove(name) dropped only the first occurrence,
so a duplicated name lingered and was later misreported as a
"test not found" framework failure. Store it as a set instead.
Fixes #27322
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
2f3cc9ff by Simon Jakobi at 2026-06-08T07:55:49-04:00
testsuite: detect fast bignum via ghc-internal, not removed ghc-bignum
The ghc-bignum package was merged into ghc-internal, so the BIGNUM_GMP
probe in test.mk ran `ghc-pkg field ghc-bignum exposed-modules`, which
fails with "cannot find package ghc-bignum". That error went to stderr
and leaked into the captured stderr of every makefile_test, causing
spurious [bad stderr] failures across the suite. The probe also silently
returned empty, so config.have_fast_bignum was wrongly False even on GMP
builds.
Probe ghc-internal's extra-libraries for the gmp library instead: the
GMP backend module is an other-module (not exposed), but GMP_LIBS adds
gmp to extra-libraries only on a GMP build, so this distinguishes the
backends. Redirect stderr to keep any future missing-package error off
the harness's stderr.
This also removes a stale comment as per suggestion from hsyl20.
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
eb3bf6e7 by Alan Zimmerman at 2026-06-08T07:56:32-04:00
EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas
This now matches what it actually does.
- - - - -
498bb21a by David Eichmann at 2026-06-09T18:02:39-04:00
Hadrian: avoid response files when command line is short enough
This replaces the logic of always using response files on Windows.
With the new condition based on command line lenght, reponse files
can be avoided in many more cases (on windows).
Now that response files are only used in a small number of cases,
response files are always kept and the -r / --keep-response-files
command line options have been removed
The response file paths are nolonger randomized. They are placed in the
`_build/rsp` directory. This ensures they are ignored by git and we
that Hadrian reuses response file paths when rebuilding rather than
leaving stale response files around.
Update user guide putting response files in its own section
- - - - -
87f510a5 by Simon Hengel at 2026-06-09T18:03:25-04:00
Don't use non-breaking spaces
- - - - -
41a19379 by David Eichmann at 2026-06-09T18:04:11-04:00
Hadrian: remove unused wrapper scripts from windows bindist
These wrapper scripts are only installed on non-relocatable builds
which are not generally supported on windows.
- - - - -
ce01ccb6 by sheaf at 2026-06-10T05:08:48-04:00
Don't drop ticks around variables of type `IO ()`
GHC.Core.Utils.mkTick is responsible for placing a tick on a Core
expression. It contains logic for dropping SCCs (non-counting profiling
ticks) around non-function variables, as such variables cannot
meaningfully contribute to profiles. However, the logic for what counts
as a function was incorrect: it used `isFunTy` which returns 'False' for
types such as 'IO ()' where the function arrow is hidden under a
newtype.
We now use 'mightBeFunTy' instead of 'isFunTy'. This ensures we don't
drop ticks in cases we aren't sure.
On the way, we improve the documentation of 'isFunTy', 'isPiTy' and
'mightBeFunTy', and update the latter's implementation to consistently
handle unary classes.
Fixes #27225
-------------------------
Metric Decrease:
T5642
-------------------------
- - - - -
d311c4f1 by Simon Jakobi at 2026-06-10T05:09:32-04:00
testsuite: Add regression test for #4081
Check that a strict constructor field is unboxed once outside an
enclosing loop, not re-inspected each iteration (the float-out
case-floating from 9cb20b488). Uses simonpj's `data T a = T !a` example
from the ticket; T4081.stderr captures the expected Core.
Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com>
- - - - -
333df444 by sheaf at 2026-06-10T05:10:25-04:00
Check for cabal-install >= 3.12 upfront
Starting with commit 8cb99552f607f6bc4000e45ab32532d50c8bb996, Hadrian
requires cabal-install >= 3.12 in order to use the 'cabal path' command
that was introduced in version 3.12, as per
https://github.com/haskell/cabal/blob/a51c4ee1556d816ad86e90db7e6330dd51b0b…
This was not reflected in the Hadrian build script, causing a delayed
build failure instead of enforcing the version requirement upfront,
which this patch does.
Fixes #27317
- - - - -
98c20394 by sheaf at 2026-06-10T05:11:09-04:00
Fix crash in Data.Data instance for HsCtxt
The Data.Data instance for HsCtxt contained an error for the 'toConstr'
method, which could trigger for example when looking at -ddump-tc-ast
traces. Replace it with the 'abstractConstr' pattern used in the rest of
the codebase.
- - - - -
5ac9ce7d by Zubin Duggal at 2026-06-10T21:26:32+05:30
hadrian: Remove old package.conf files when generating new ones
Old package.conf files might exists with different hashes, causing issues like #26661
Fixes #26661
- - - - -
c9015f09 by sheaf at 2026-06-11T12:40:28-04:00
Fix AArch64 clobbering bug for MUL2
On AArch64, the code generator could clobber one of the input operands
when computing the lower bits of a MUL2 operation. This rendered invalid
the subsequent computation of the high bits.
This commit fixes that by using a temporary register. The register
allocator can remove the redundant move in the common case when the
registers do not conflict.
Fixes #27046
- - - - -
7ab90288 by Rodrigo Mesquita at 2026-06-11T12:41:11-04:00
fix: make T27131 less flaky
It seems that T27131 fails flakily in a race where we check the flag
before the capability had the chance to process the mailbox which sets
the flag. This seemingly should only happen if the capability ends up
being the same for setting and checking the flag.
- - - - -
8965cb76 by Marc Scholten at 2026-06-12T04:53:22-04:00
haddock: render modules concurrently
- - - - -
8cc0b64a by Duncan Coutts at 2026-06-12T04:54:06-04:00
Promote HAVE_PREEMPTION from Timer.c to OSThreads.h
We will want to know about HAVE_PREEMPTION in more places.
HAVE_PREEMPTION tells us that we do have OS threads available,
irrespective of whether THREADED is defined. In particular,
HAVE_PREEMPTION is defined on all proper OSs, but not on WASM (and
hyopthetically may not be true on some other platforms like
micro-controllers, RTOSs, VM hypervisors etc).
- - - - -
cce574ed by Duncan Coutts at 2026-06-12T04:54:06-04:00
Define ACQUIRE_LOCK_ALWAYS and friends
Fix issue #27335
Like the atomic _ALWAYS variants, these lock actions are always defined,
rather than being dependent on whether we are in the THREADED case. All
the "normal" LOCK macros are defined to be no-ops when !THREADED.
The use case for the _ALWAYS variants is where we are using OS threads
even in the non-threaded RTS. This includes everything to do with the
timer/ticker thread, which is used in the non-threaded RTS too.
In particular, we will want to use this for eventlog things, because the
timer thread performs eventlogging concurrently with the main
capability, even in the non-threaded RTS.
- - - - -
1f28d1f6 by Duncan Coutts at 2026-06-12T04:54:06-04:00
Use ACQUIRE/RELEASE_LOCK_ALWAYS with eventBufMutex
Even in the non-threaded RTS the eventBufMutex is needed by both the
main capability and the timer/ticker thread, so always use the mutex.
This should fix #25165 which is about the main capability and the timer
thread posting events to the eventlog buffer concurrently and thereby
corrupting the buffer data.
- - - - -
0ff29782 by Duncan Coutts at 2026-06-12T04:54:06-04:00
Expose eventBufMutex in the EventLog interface/header
We will need it in forkProcess to ensure we don't write to the global
eventlog buffer concurrently with trying to flush eventlog buffers and
do the fork().
- - - - -
7a688395 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Split flushAllCapsEventsBufs into safe and unlocked version
Following the convention that unlocked versions have a trailing _
underscore in their name. This one requires the caller to hold the
eventlog global buffer mutex. We will need this in forkProcess.
- - - - -
341ed474 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Remove redundant use of stopTimer in setNumCapabilities
Historically, the comment here was:
We must stop the interval timer while we are changing the
capabilities array lest handle_tick may try to context switch
an old capability. See #17289.
and
We must disable the timer while we do this since the tick handler may
call contextSwitchAllCapabilities, which may see the capabilities array
as we free it.
What this refers to is that historically, when changing the number of
capabilities, the array of capabilities was reallocated to a new size,
allocating new ones and freeing the old ones, thus invalidating all
existing capbility pointers.
Strangely, for good measure the code used to call stopTimer twice (hence
the two similar comments above).
However, since commit a3eccf06292dd666b24606251a52da2b466a9612, the
capabilities array is no longer reallocated. Instead the array is
allcoated once on RTS startup to the maximum size it could ever be
allowed to be, and then capabilities get enabled/disabled at runtime. So
the capability pointers never become invalid anymore. At worst, they may
point to capabilities that are disabled.
Thus we no longer need to stop the timer (twice) while we change the
number of enabled capabilities. This also partially solves issue #27105,
which notes that stopTimer is being used as if it were synchronous, when
it is not. At least for this case, the solution is that stopTimer is not
needed at all!
- - - - -
674858e3 by Duncan Coutts at 2026-06-12T04:54:07-04:00
Remove redundant use of stopTimer in forkProcess
but replace it with taking the eventlog buffer lock during the fork.
Fixes issue #27105
The original reason to block the timer during a fork was that
historically the timer was implemented using a periodic timer signal,
and the signal itself would interrupt the fork system call (returning
EINTR). For large processes (where fork() takes a while) this could
permanently livelock: the timer always would go off before the fork
could complete, which got retried in a loop forever.
The timer is no longer implemented as a unix signal, but uses threads.
Thus the original problem no longer exists. The only remaining reason to
block the timer tick is to prevent actions taken by the tick from
interfering with the delicate process involved in fork (taking a load of
locks and pausing everything).
The only thing we need to do is to prevent the eventlog from being
written to or flushed while the fork is taking place. To achieve this
all we need to do is hold the mutex for the global eventlog buffer.
This removes the last use of stopTimer that expects stopTimer to work
synchronously (which it was not) and thus solves issue #27105. To be
clear, we solve issue #27105 not by making stopTimer synchronous, but by
eliminating the use sites that expected it to be synchronous.
- - - - -
eb64f6fa by Duncan Coutts at 2026-06-12T13:37:09+01:00
Add a test for thread scheduler fairness
It also tests that the interval timer and context switching works.
We also test that fairness is lost when the context switching interval
is too coarse for the duration of the test.
We add this test before doing surgery on the interval timer, so we have
decent coverage.
- - - - -
b98680f0 by Duncan Coutts at 2026-06-12T13:37:09+01:00
Make exported stop/startTimer no-ops, and rename internal functions
Specifically, internally rename:
stop/startTimer to pause/unpauseTimer
stop/startTicker to pause/unpauseTicker
and keep stop/startTimer as exported functions, but now as no-ops.
In the past the stop/startTicker actions were used incorrectly as if
they were synchronous, which they are not. See issue #27105. We now
document pause/unpackTicker as being async and not to be used for the
purpose of concurrency safety.
The existing stop/startTimer (note Timer not Ticker, the Timer calls the
Ticker!) are also exported from the RTS as a public API. This was
historically because the ticker used signals and it was important to
suspend the timer signel over a process fork. So these functions were
exported to be used by the process and unix libraries.
We cannot just remove the RTS exports, but we now make them no-ops, and
they can be removed from the process and unix library later. This
was already documented in a changelog.d entry no-more-timer-signal but
due to changes during the MR process the change to make stop/startTicker
into no-ops didn't make it into the earlier MR.
- - - - -
c09e823b by Duncan Coutts at 2026-06-12T13:37:09+01:00
Make exitTicker/exitTimer unconditionally synchronous
We never use them asynchronously, and we should never need to do so.
And update some related comments.
- - - - -
1d60852d by Duncan Coutts at 2026-06-12T13:37:09+01:00
posix ticker: update and improve comments on (un)pause and exit
Clarify what is async vs sync.
- - - - -
7bcd9b93 by Duncan Coutts at 2026-06-13T21:56:25+01:00
posix ticker: split out ppoll/select helper functions
Move the #ifdefs out of the main code body by introducing local helper
functions and types, which themselves have two implementations (with a
common API) based on ppoll or select.
This helps improve clarity/readability.
- - - - -
de07e21c by Duncan Coutts at 2026-06-13T21:56:25+01:00
posix ticker: improve the implementation
The existing implementation supported pausing and exiting, with the
implementation of pausing reling on a mutex and condition variable.
It needed to check the pause and stop shared variables on every
iteration. It relies on ppoll or select, to wait on the timeout and also
wait on an interrupt fd. The interrupt fd was only used for prompt
exit/shutdown, and not for pausing or other notification. The pause only
needed a lock and a memory operation, but the pause was not prompt. The
resume used a lock, and signaling a cond var.
The new implementation uses a somewhat more regular design: every
notification is done by setting a shared variable and
interrupting/notifying the ticker via the fd. The ticker thread does not
need to check any shared variables on normal timer expiry, only when it
recevies notification. This may be a micro-optimisation, but the tick
occurs 100 times a second by default so any improvements in the hot path
are amplified. When the ticker thread does receive notification it can
check the various shared variables and update its local state. The
blocking relies on using ppoll/select but without a timeout. This avoids
the condition var and also allows further notifications when paused
(also used for unpausing).
This design can be extended with further notification types if needed by
using and checking further shared vars (or making existing shared vars
an enum or counter). This may be used in future for additional
notifications to the ticker thread. This will likely be used to proxy
wakeUpRts from a single handler context for example. And this approach,
avoiding mutexes, is compatible with use from signal handlers.
So overall, it's:
* slightly simpler / more regular;
* easier to extend with additional notifications;
* probably slightly more efficient (but a micro-optimisation);
* and supports calling notification from signal handlers
- - - - -
3252c63e by Duncan Coutts at 2026-06-13T21:56:25+01:00
posix ticker: further minor local renaming for code clarity
Improve the clarity with better choice of names for several local vars
and function.
- - - - -
c91e49b5 by Duncan Coutts at 2026-06-13T21:56:25+01:00
win32 ticker: split out local helper functions
- - - - -
6a01ae12 by Duncan Coutts at 2026-06-13T21:56:25+01:00
win32 ticker: provide guarantee about concurrency and idempotency
Use a lock to ensure pause/unpause can be used concurrently. Use a
paused variable, protected by the lock, to ensure that pause and unpause
are both idempotent. This is what the portable API expects.
- - - - -
6b243d4d by Duncan Coutts at 2026-06-13T21:56:25+01:00
win32 ticker: make the initial tick be after one wait interval
There is no need to tick immediately. This is consistent with the
posix implementation.
- - - - -
3d9758af by Duncan Coutts at 2026-06-13T21:56:25+01:00
ticker: remove now-unnecessary layer of enable/disable
There was an atomic variable used to block *part* of the actions of the
tick handler. This still did not make stopTimer synchronous, even for
the part of the the handle_tick actions it covered. It also added a more
expensive (sequentuially consistent) atomic operation in the hot path
for the handle_tick action, whereas our new design requires no atomic
ops at all.
Now that we have eliminate the need for synchronous stop/startTicker,
we don't need this not-quite-working-anyway atomic protocol. The new
pause/unpauseTicker is explicitly asynchronous and idempotent.
- - - - -
c52752fb by Duncan Coutts at 2026-06-13T21:56:25+01:00
ticker: add TODOs about issue #27250: too much being done from handle_tick
The handle_tick should not perform I/O, block, perform long-running
operations or call arbitrary user code. Unfortunately, everything to
do with the eventlog (at the moment) falls into all those categories.
- - - - -
0e973ba6 by Duncan Coutts at 2026-06-13T21:57:31+01:00
Adjust releaseCapability_ precondition to allow cap->running_task == NULL
There are two use cases for releaseCapability_:
1. The current Task (cap->running_task) releases the Capability.
The Capability is marked free, and if there is any work to do,
an appropriate Task is woken up.
2. There is no current task (cap->task == NULL), and thus the
Capability is idle, and we want to wake up an idle Task to animate
the Capability. This case uses always_wakeup.
Currently, the precondition for releaseCapability_ is
cap->running_task != NULL
and so the 2nd use cases have to set cap->running_task (which is then
immediately overwritten) just to satisfy the precondition. See the
use cases in sendMessage and prodCapability.
So we can relax the precondition to be:
cap->running_task != NULL || always_wakeup
so that in the always_wakeup case, we say it is ok for the
cap->running_task to be NULL.
This lets us simplify sendMessage and prodCapability. In particular it
will allow prodCapability to not need a Task parameter.
The ulterior motive for all this is that I want to be able to call
prodCapability from an OS thread that is not itself a Task, in persuit
of issue #27086: disentangle I/O managers from wakeUpRts. The most
straightforward way to wake the RTS is using prodCapability, but the
context in which we will need to do that are threads that are not Tasks.
- - - - -
34690658 by Duncan Coutts at 2026-06-13T21:57:31+01:00
prodCapability no longer needs to take a Task param
Now that releaseCapability_ can accept cap->running_task == NULL then it
is no longer necessary for prodCapability to require a Task.
- - - - -
f44938eb by Duncan Coutts at 2026-06-13T21:57:32+01:00
Define prodOneCapability
There was an existing declaration for this in the header file, but no
definition.
Similarly, there is a declaration for prodAllCapabilities but no
definition, and we don't need it, so remove the declaration.
- - - - -
896ff620 by Duncan Coutts at 2026-06-13T21:57:32+01:00
Add a wakeUpRtsViaTicker feature to the posix ticker
It proxies a call to wakeUpRts, but crucially, this can be called from
a signal handler context. It will be used for ctl-c handling.
- - - - -
dae1d880 by Duncan Coutts at 2026-06-13T21:57:32+01:00
Change how wakeUpRts works
Previously it would call wakeupIOManager to get a capability to wake up
and run. This works but it entangles the I/O managers with unrelated
features: ctl-c handling and idle gc (the two features that use wakeUpRts).
The reason it used wakeupIOManager is that this action is safe to use
from a posix signal handler, since it just posts bytes to a pipe.
Otherwise the more direct approach (used e.g. by sendMessage when the
target capability is idle) is to use releaseCapability. But that uses
condition variables and mutexes, which are not safe to use from within a
signal handler.
So instead of entangling the (multiple) I/O managers with this, we make
wakeUpRts use the direct approach (using prodOneCapability). On win32
the ctl-c console handler can call wakeUpRts directly, since it is
called in a proper thread. On posix, to deal with the signal handler
problem, we make the signal handler ask the ticker thread to proxy the
call to wakeUpRts, since the ticker thread is also a proper thread.
This will allow the I/O managers to no longer be concerned with this.
This is good because there are many I/O managers (and they're
complicated), but there is (on posix) only one ticker implementation. So
this is an overall reduction in coupling and complexity.
Fixes issue #27086
- - - - -
3f9e3c9d by Duncan Coutts at 2026-06-15T15:11:35+01:00
Move THREADED_RTS-conditional struct members to end of Capability
Accessing members of the Capability struct from CMM code rely on
accessor macros. (The macros are generated by deriveConstants).
These macros have a single definition. This means that the offsets of
all struct members must *not* vary based on THREADED_RTS vs
!THREADED_RTS. This requires that any struct members that are
conditional on THREADED_RTS must occur after the unconditional struct
members. Hence we move all the ones that are conditional on
THREADED_RTS to the end.
Add a deriveConstants entry for the iomgr member of the Capability
struct, which was the motivation for this change.
Add warning messages to help our future selves. Debugging this took me
a couple hours in gdb!
- - - - -
a3157514 by Duncan Coutts at 2026-06-15T15:11:37+01:00
Make the IOManager API use CapIOManager rather than Capability
This makes the API somewhat more self-contained and more consistent.
Now the IOManager API and each of the backends takes just the I/O
manager structure. Previously we had a bit of a mixture, depending on
whether the function needed access to the Capability or just the
CapIOManager.
We still need access to the cap, so we introduce a back reference to
reach the capability, via iomgr->cap.
Convert all uses in select and poll backends, but not win32 ones.
Convert callers in the scheduler and elsewhere.
Also convert the three CMM primops that call IOManager APIs. They just
need to use Capability_iomgr(MyCapability()).
- - - - -
e625d3c9 by Duncan Coutts at 2026-06-15T15:19:41+01:00
Split posix/MIO.c out of posix/Signals.c
The MIO I/O manager was secretly living inside the Signals file.
Now it gets its own file, like any other self-respecting I/O manager.
- - - - -
170869bf by Duncan Coutts at 2026-06-15T15:19:44+01:00
Rationalise some scheduler run queue utilities
Move them all to the same place in the file.
Make some static that were used only internally.
Also remove a redundant assignment after calling truncateRunQueue that
is already done within truncateRunQueue.
- - - - -
4c713d6d by Duncan Coutts at 2026-06-15T15:19:44+01:00
Rename initIOManager{AfterFork} to {re}startIOManager
These are more accurate names, since these actions happen after
initialisation and are really about starting (or restarting) background
threads.
- - - - -
ced4bf6f by Duncan Coutts at 2026-06-15T15:19:44+01:00
Add a TODO to the MIO I/O manager
The direction of travel is to make I/O managers per-capability and have
all their state live in the struct CapIOManager. The MIO I/O manager
however still has a number of global variables.
It's not obvious how handle these globals however.
- - - - -
be706782 by Duncan Coutts at 2026-06-15T15:19:44+01:00
Free per-cap I/O managers during shutdown and forkProcess
Historically this was not strictly necessary. The select and win32
legacy I/O managers did not maintain any dynamically allocated
resources. The new poll one does (an auxillary table), and so this
should be freed.
After forkProcess, all threads get deleted. This includes threads
waiting on I/O or timers. So as of this patch, resetting the I/O
manager is just about tidying things up. For example, for the poll
I/O manager this will reset the size of the AIOP table (which
otherwise grows but never shrinks).
In future however the re-initialising will become neeecessary for
functionality, since some I/O managers will need to re-initialise
wakeup fds that are set CLOEXEC.
- - - - -
1d310e81 by Duncan Coutts at 2026-06-15T15:39:21+01:00
Add a FIXME note in the Poll I/O manager
- - - - -
0fb60b2e by Duncan Coutts at 2026-06-15T15:39:24+01:00
Minor doc improvement to struct StgAsyncIOOp member outcome
Mention the enumeration names, as well as their numeric values. The rest
of the code uses the enum names.
- - - - -
213b091d by Duncan Coutts at 2026-06-15T15:39:24+01:00
Avoid exporting various win32-specific rts symbols
The BeginPrivate.h / EndPrivate.h scheme works perfectly well on
Windows, but all of the rts/win32/*.h files were not using it.
- - - - -
e3bfb1a9 by Duncan Coutts at 2026-06-16T10:40:37+01:00
Remove wakeupIOManager, ioManagerWakeup and setIOManagerWakeupFd
We no longer need wakeupIOManager for the threaded RTS case, so we can
remove it and the bits only needed to support it. This includes the
pipe/eventfd fd shared between the RTS and the in-library I/O manager
used for waking up the I/O manager thread. The pipe/eventfd still
exists, but it no longer has to be communicated to the RTS, since the
RTS no longer needs to use it.
So we remove the RTS API export setIOManagerWakeupFd, and remove uses of
it within the I/O managers in ghc-internal.
- - - - -
934f0cc3 by Duncan Coutts at 2026-06-16T15:07:26+01:00
Add a new interruptIOManager API for the I/O managers
It will be used to interrupt awaitCompletedTimeoutsOrIO. Also update the
return type and docs for awaitCompletedTimeoutsOrIO to have it return
false when it gets interrupted, and have no useful post condition in
that case.
- - - - -
0dbb8e1d by Duncan Coutts at 2026-06-16T15:17:57+01:00
Add interruptIOManager support for select I/O manager
Uses the FdWakup mechanism.
- - - - -
cc296433 by Duncan Coutts at 2026-06-16T15:24:32+01:00
Add interruptIOManager support for poll I/O manager
Uses the FdWakup mechanism.
A quirk we have to cope with is that we now need to poll one more fd --
the wakeup_fd_r -- but this fd has no corresponding entry in the
aiop_table. This is awkward since we have set up our aiop_poll_table to
be an auxilliary table with matching indicies.
The solution this patch uses (and described in the comments) is to have
two tables: struct pollfd *aiop_poll_table, *full_poll_table;
and to have the aiop_poll_table alias the tail of the full_poll_table.
The head entry in the full_poll_table is the extra fd. So we poll the
full_poll_table, while the aiop_poll_table still has matching indicies
with the aiop_table.
Hurrah for C aliasing rules.
- - - - -
7027b6ec by Duncan Coutts at 2026-06-18T12:51:18+01:00
Add interruptIOManager support for win32 legacy I/O manager
And remove unused related helper resetAbandonRequestWait. It is not
called because the event is created in auto-reset mode, so never needs
to be reset manually.
- - - - -
8b105ca9 by Duncan Coutts at 2026-06-18T12:52:31+01:00
Note lack of interruptIOManager support for WinIO I/O manager
Though there's a plausible design, we can't sanely test it at the moment
due to related WinIO bugs. Filed as issue #27403.
- - - - -
9081d392 by Duncan Coutts at 2026-06-18T14:58:54+01:00
Make signal handling be a respondibility of the I/O manager(s)
Previously it was scattered between I/O managers and the scheduler, and
especially the scheduler's deadlock detection.
Previously the scheduler would poll for pending signals each iteration
of the scheduler loop. The scheduler also had some hairy signal
functionality in the deadlock detection: in the non-threaded RTS (only)
if there were still no threads running after deadlock detection then it
would block waiting for signals.
But signals can and (in my opinion) should be thought of as just a funny
kind of I/O, and thus should be a responsibility of the I/O manager.
So now we have the I/O managers poll for signals when they are polling
for I/O completion (and removing the separate poll in the scheduler).
And when I/O managers block waiting for I/O then they now also start
signal handlers if they get interrupted by a signal. Crucially, if there
is no pending I/O or timers, the awaitCompletedTimeoutsOrIO will still
block waiting for signals.
This patch puts us into an intermediate state: it temporarily breaks
deadlock detection in the non-threaded RTS. The waiting on I/O currently
happens before deadlock detection. This means we'll now wait forever on
signals before doing deadlock detection. We need to move waiting after
deadlock detection. We'll do that in a later patch.
- - - - -
bd5e074a by Duncan Coutts at 2026-06-18T15:07:04+01:00
Clean up the RTS internal signal handling API
Now that the I/O manager is responsible for signals, we can simplify the
API we present for signal handling.
We now just need startPendingSignalHandlers, which is called from the
I/O managers. We can get rid of awaitUserSignals. We also don't need
RtsSignals.h to re-export the platform-specific posix/Signals.h or
win32/ConsoleHandler.h
We can also hide more of the implementation of signals. Less has to be
exposed in posix/Signals.h or win32/ConsoleHandler.h. Indeed,
posix/Signals.h becomes empty and we remove it. Partly this is because
we don't need inline functions (or macros) in the interface.
Also remove signal_handlers from RTS ABI exported symbols list. It does
not appear to have any users in the core libs, and its really an
internal implementation detail. It should not be exposed unless it's
really necessary.
- - - - -
638e6633 by Duncan Coutts at 2026-06-18T15:07:52+01:00
In the scheduler, move I/O blocking after deadlock detection
To make deadlock detection effective in the non-threaded RTS when there
are deadlocked threads and other unrelated threads waiting on I/O, we
need to arrange to do deadlock detection before we block in scheduler
to wait on I/O.
The solution is to:
1. adjust scheduleFindWork, which runs before deadlock detection, to
only poll for I/O and not block; and
2. add a step after deadlock detection to wait on I/O if there are
still no threads to run (and there's any I/O or timeouts outstanding)
The scheduleCheckBlockedThreads is now so simple that it made more sense
to inline it into scheduleFindWork.
- - - - -
e466337a by Duncan Coutts at 2026-06-18T15:07:52+01:00
Remove bogus anyPendingTimeoutsOrIO guard from scheduleDetectDeadlock
The deadlock detection was only invoked if both of these conditions
hold:
1. the run queue is empty
2. there is no pending I/O or timeouts
The second condition is unnecessary. The deadlock detection mechanism
can find deadlocks even if there are other threads waiting on I/O or
timers. Having this extra condition means that we fail to detect
blocked threads if there are any threads waiting on I/O or timers.
Part of fixing issue #26408
- - - - -
6ffecbb5 by Duncan Coutts at 2026-06-18T15:07:53+01:00
Don't consider pending I/O for early context switch optimisation
Context switches are normally initiated by the timer signal. If however
the user specifies "context switch as often as possible", with +RTS -C0
then the scheduler arranges for an early context switch (when it's just
about to run a Haskell thread).
Context switching very often is expensive, so as an optimisation there
cases where we do not arrange an early context switch:
1. if there's no other threads to run
2. if there is no pending I/O or timers
This patch eliminates case 2, leaving only case 1.
The rationale is as follows. The use of this was inconsistent across
platforms and threaded/non-threaded RTS ways. It only worked on the
non-threaded RTS and on Windows only worked for the win32-legacy I/O
manager. On all other combinations anyPendingTimeoutsOrIO would always
return false. The fact that nobody noticed and complained about this
inconsistency suggests that the feature is not relied upon.
If however it turns out that applications do rely on this, then the
proper thing to do is not to restore this check, but to add a new I/O
manager hint function that returns if there is any pending events that
are likely to happen *soon*: for example timeouts expiring within one
timeslice, or I/O waits on things likely to complete soon like disk I/O,
but not for example socket/pipe I/O.
The motivation to avoid this use of anyPendingTimeoutsOrIO is to
allow us to eliminate anyPendingTimeoutsOrIO entirely. All other uses
of this are just guards on {await,poll}CompletedTimeoutsOrIO and
the guards can safely be folded into those functions. This will better
cope with some I/O managers having no proper implementation of
anyPendingTimeoutsOrIO.
Ultimately this will let us simplify the scheduler which currently has
to have special #ifdef mingw32_HOST_OS cases to cope with the lack of a
working anyPendingTimeoutsOrIO for some Windows I/O managers
- - - - -
5e672033 by Duncan Coutts at 2026-06-18T15:07:53+01:00
Remove anyPendingTimeoutsOrIO guarding {poll,await}CompletedTimeoutsOrIO
Previously the API of the I/O manager used a two step process: check
anyPendingTimeoutsOrIO and then call {poll,await}CompletedTimeoutsOrIO.
This was primarily there as a performance thing, to cheaply check if we
need to do anything.
And then because anyPendingTimeoutsOrIO existed, it was used for other
things too. We have now eliminated the other uses, and are just left
with the performance pattern.
But this was problematic because not all I/O managers correctly
implement anyPendingTimeoutsOrIO (specifically the win32 ones), and now
that we also make I/O managers responsible for signals then we need to
poll/await even if there is no pending I/O or timeouts. If there is no
pending I/O or timeouts then poll/await needs to degenerate to just
waiting forever for any signals.
- - - - -
a2d9bd5b by Duncan Coutts at 2026-06-18T15:10:10+01:00
Remove anyPendingTimeoutsOrIO, it is no longer used
And this avoids the problems arising from the win32 I/O managers having
had a bogus implementation.
- - - - -
41be6fb5 by Duncan Coutts at 2026-06-18T15:10:14+01:00
Remove second scheduler call to awaitCompletedTimeoutsOrIO
Previously awaitCompletedTimeoutsOrIO was called both before and after
deadlock detection in the scheduler. The reason for that was that the
win32 I/O managers had a bogus implementation of anyPendingTimeoutsOrIO
and this was used to guard the call of awaitCompletedTimeoutsOrIO prior
to deadlock detection. This meant the first call site was never actually
called when using the win32 I/O managers. This was the reason for the
second call: the first one was never used. What a mess.
So now we have a simple design in the scheduler:
1. poll for completed I/O, timers or signals
2. if no runnable threads: do deadlock detection
3. if still no runnable threads: block waiting for I/O, timers or
signals.
- - - - -
74eedbbe by Duncan Coutts at 2026-06-18T15:10:14+01:00
Lift emptyRunQueue guard out of scheduleDetectDeadlock
this improved the clarity of the logic when reading the scheduler code.
- - - - -
e18378ae by Duncan Coutts at 2026-06-18T15:10:14+01:00
Make non-threaded deadlock detection also rely on idle GC
Only do deadlock detection GC when idle GC kicks in. This also relies on
using wakeUpRts, so now do this unconditionally. Previously wakeUpRts
was for the threaded rts only.
- - - - -
751abd40 by Duncan Coutts at 2026-06-18T15:10:15+01:00
Enable idle GC by default on non-threaded RTS.
The behaviour is now uniform between threaded and non-threaded. The
deadlock detection now relies on idle GC for both threaded and
non-threaded ways. Previously deadlock detection did not rely on idle
GC for the non-threaded way.
- - - - -
c5d3f352 by Duncan Coutts at 2026-06-18T15:10:15+01:00
Add a long Note [Deadlock detection]
It describes the historical and modern designs and their trade-offs.
The point is we've now unified the code for deadlock detection between
the threaded and non-threaded ways, by changing the non-threaded to
follow the same design as the threaded.
- - - - -
ed652fcb by Duncan Coutts at 2026-06-18T15:10:15+01:00
Add a test for deadlock detection, issue #26408
- - - - -
e248df7a by Duncan Coutts at 2026-06-18T15:10:15+01:00
Update the user guide with the revised idle GC behaviour
i.e. it's now not just for the threaded RTS, but general.
Also document the fact that disabling idle GC also disables deadlock
detection.
- - - - -
2255 changed files:
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/generate-ci/flake.lock
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/issue_templates/default.md
- + .gitlab/issue_templates/release_tracking.md
- .gitlab/jobs.yaml
- .gitlab/merge_request_templates/Default.md
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- .gitmodules
- boot
- + changelog.d/T15973
- + changelog.d/T19174.md
- + changelog.d/T25636
- + changelog.d/T26979
- + changelog.d/T27022
- + changelog.d/T27046
- + changelog.d/T27121.md
- + changelog.d/T27124.md
- + changelog.d/T27131
- + changelog.d/T27182.md
- + changelog.d/T27202
- + changelog.d/T27225
- + changelog.d/T27261
- + changelog.d/T27317
- + changelog.d/T27359
- + changelog.d/binary-array-no-list
- + changelog.d/bump-process
- + changelog.d/bytecode-interpreter-hpc-support
- + changelog.d/changelog-entries
- + changelog.d/cmm-import-syntax-changes
- + changelog.d/config
- + changelog.d/dynamic-trace-flags
- + changelog.d/elem-via-foldr-27096
- + changelog.d/fix-blackhole-handling
- + changelog.d/fix-duplicate-pmc-warnings
- + changelog.d/fix-finalizers-27072
- + changelog.d/fix-ghci-duplicate-warnings-26233
- + changelog.d/ghc-api-epa-parens
- + changelog.d/ghc-api-holes-ast-27111
- + changelog.d/ghc-api-namespace-specifier-26678
- + changelog.d/ghc-pkg-faster-closure
- + changelog.d/ghc-pkg-long-path-support
- + changelog.d/hadrian-response-files.md
- + changelog.d/hadrian-stale-package-confs-26661
- + changelog.d/hadrian-system-cxx-std-lib-25303
- + changelog.d/hadrian-warn-missing-package-index-16484
- + changelog.d/ipe-event-class
- + changelog.d/jobserver-leak-fix
- + changelog.d/lib-add-tuple-tyfam-27179
- + changelog.d/libdir-setting
- + changelog.d/llvm-22
- + changelog.d/module-graph-reuse-in-downsweep
- + changelog.d/more-efficient-home-unit-imports-finding
- + changelog.d/no-more-timer-signal
- + changelog.d/remove-bignum-check-backend
- + changelog.d/remove-bignum-ffi-backend
- + changelog.d/rts_symlinks.md
- + changelog.d/semaphore-v2
- + changelog.d/simd_constant_folding
- + changelog.d/skip-test
- + changelog.d/so_inline_is_a_predicate
- + changelog.d/tcplugin_init.md
- + changelog.d/tcplugins-pmc.md
- + changelog.d/typecheckModule-API.md
- + changelog.d/wasm-fix-serviceworker
- + changelog.d/windows-rethrow-overlapped-exception
- + changelog.d/withTcPlugins.md
- compiler/CodeGen.Platform.h
- compiler/GHC.hs
- compiler/GHC/Builtin/Names.hs
- compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- + compiler/GHC/ByteCode/Binary.hs
- compiler/GHC/ByteCode/Breakpoints.hs
- compiler/GHC/ByteCode/InfoTable.hs
- compiler/GHC/ByteCode/Instr.hs
- compiler/GHC/ByteCode/Linker.hs
- + compiler/GHC/ByteCode/Recomp/Binary.hs
- compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/Cmm/Dataflow/Graph.hs
- compiler/GHC/Cmm/Dataflow/Label.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/LayoutStack.hs
- compiler/GHC/Cmm/Lexer.x
- compiler/GHC/Cmm/Liveness.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Node.hs
- compiler/GHC/Cmm/Opt.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Type.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/AArch64/Regs.hs
- compiler/GHC/CmmToAsm/BlockLayout.hs
- compiler/GHC/CmmToAsm/CFG.hs
- compiler/GHC/CmmToAsm/Config.hs
- compiler/GHC/CmmToAsm/LA64/CodeGen.hs
- compiler/GHC/CmmToAsm/LA64/Instr.hs
- compiler/GHC/CmmToAsm/LA64/Ppr.hs
- compiler/GHC/CmmToAsm/LA64/Regs.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/Ppr.hs
- compiler/GHC/CmmToAsm/PPC/Regs.hs
- compiler/GHC/CmmToAsm/RV64/CodeGen.hs
- compiler/GHC/CmmToAsm/RV64/Ppr.hs
- compiler/GHC/CmmToAsm/RV64/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.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/CmmToAsm/X86/Regs.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm.hs
- compiler/GHC/CmmToLlvm/Base.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/CmmToLlvm/Config.hs
- compiler/GHC/CmmToLlvm/Data.hs
- compiler/GHC/CmmToLlvm/Mangler.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/Lint.hs
- + compiler/GHC/Core/Lint/SubstTypeLets.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/FloatIn.hs
- compiler/GHC/Core/Opt/FloatOut.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Pipeline.hs
- + compiler/GHC/Core/Opt/Range.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/WorkWrap.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/Ppr.hs
- compiler/GHC/Core/RoughMap.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/Tidy.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/Ppr.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/TyCon/Env.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/AddImplicitBinds.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Data/FastString/Env.hs
- compiler/GHC/Data/List/SetOps.hs
- compiler/GHC/Data/Pair.hs
- compiler/GHC/Data/TrieMap.hs
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Map/Lazy.hs
- compiler/GHC/Data/Word64Map/Strict.hs
- compiler/GHC/Data/Word64Map/Strict/Internal.hs
- compiler/GHC/Driver/Backend.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/CodeOutput.hs
- compiler/GHC/Driver/Config.hs
- compiler/GHC/Driver/Config/CmmToAsm.hs
- compiler/GHC/Driver/Config/CmmToLlvm.hs
- compiler/GHC/Driver/Config/Core/Lint.hs
- compiler/GHC/Driver/Config/Interpreter.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env/Types.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Hooks.hs
- compiler/GHC/Driver/Main.hs
- + compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot
- + compiler/GHC/Driver/Main/Hsc.hs
- + compiler/GHC/Driver/Main/Interactive.hs
- + compiler/GHC/Driver/Main/Passes.hs
- + compiler/GHC/Driver/Main/Passes.hs-boot
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeAction.hs
- compiler/GHC/Driver/MakeSem.hs
- compiler/GHC/Driver/Phases.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Pipeline/Monad.hs
- compiler/GHC/Driver/Pipeline/Phases.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs/Basic.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/DocString.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Expr.hs-boot
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Arrows.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Breakpoints.hs
- compiler/GHC/HsToCore/Coverage.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Errors/Ppr.hs
- compiler/GHC/HsToCore/Errors/Types.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Foreign/C.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.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/HsToCore/Usage.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Recomp/Types.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/Linker/ByteCode.hs
- compiler/GHC/Linker/Deps.hs
- compiler/GHC/Linker/Dynamic.hs
- compiler/GHC/Linker/Executable.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Linker/Types.hs
- compiler/GHC/Linker/Unit.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/HaddockLex.x
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Parser/String.hs
- compiler/GHC/Parser/Types.hs
- compiler/GHC/Platform.hs
- + compiler/GHC/Platform/Tag.hs
- compiler/GHC/Prelude/Basic.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/Expr.hs-boot
- compiler/GHC/Rename/Fixity.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/Utils.hs
- compiler/GHC/Runtime/Debugger/Breakpoints.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Eval/Types.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Interpreter/Types/SymbolCache.hs
- compiler/GHC/Runtime/Interpreter/Wasm.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Settings.hs
- compiler/GHC/Settings/Constants.hs
- compiler/GHC/Settings/IO.hs
- compiler/GHC/Stg/Debug.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm.hs
- compiler/GHC/StgToCmm/Bind.hs
- compiler/GHC/StgToCmm/Closure.hs
- compiler/GHC/StgToCmm/DataCon.hs
- compiler/GHC/StgToCmm/Env.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Heap.hs
- compiler/GHC/StgToCmm/InfoTableProv.hs
- compiler/GHC/StgToCmm/Layout.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToCmm/Prof.hs
- compiler/GHC/StgToCmm/Ticky.hs
- compiler/GHC/StgToCmm/Utils.hs
- compiler/GHC/StgToJS/Ids.hs
- compiler/GHC/StgToJS/Literal.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Infer.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Hole.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/Do.hs
- + compiler/GHC/Tc/Gen/Expand.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Expr.hs-boot
- 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/Match.hs-boot
- 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/FunDeps.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/Monad.hs
- compiler/GHC/Tc/Solver/Rewrite.hs
- compiler/GHC/Tc/Solver/Solve.hs
- compiler/GHC/Tc/Solver/Types.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/TyCl/Class.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/LclEnv.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Types/Origin.hs-boot
- compiler/GHC/Tc/Utils/Backpack.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/TcType.hs
- compiler/GHC/Tc/Utils/TcType.hs-boot
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Validity.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Error.hs
- + compiler/GHC/Types/Error.hs-boot
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/ForeignStubs.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/HpcInfo.hs
- compiler/GHC/Types/Id.hs
- compiler/GHC/Types/Id/Info.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/Literal.hs
- + compiler/GHC/Types/Literal/Floating.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Env.hs
- compiler/GHC/Types/Name/Occurrence.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/Name/Set.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/SourceText.hs
- compiler/GHC/Types/SrcLoc.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Types/Unique/DSet.hs
- compiler/GHC/Types/Unique/FM.hs
- compiler/GHC/Types/Unique/Supply.hs
- compiler/GHC/Types/Var/Env.hs
- + compiler/GHC/Types/Var/FV.hs
- compiler/GHC/Types/Var/Set.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Home/Graph.hs
- compiler/GHC/Unit/Home/ModInfo.hs
- compiler/GHC/Unit/Info.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/Graph.hs
- compiler/GHC/Unit/Module/Location.hs
- compiler/GHC/Unit/Module/ModGuts.hs
- compiler/GHC/Unit/Module/Status.hs
- compiler/GHC/Unit/State.hs
- + compiler/GHC/Unit/State.hs-boot
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/EndoOS.hs
- compiler/GHC/Utils/Error.hs
- − compiler/GHC/Utils/FV.hs
- compiler/GHC/Utils/Logger.hs
- compiler/GHC/Utils/Misc.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/GHC/Utils/Ppr/Colour.hs
- compiler/GHC/Utils/Trace.hs
- compiler/GHC/Wasm/ControlFlow/FromCmm.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Decls/Foreign.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/ImpExp.hs
- compiler/Language/Haskell/Syntax/Lit.hs
- compiler/Language/Haskell/Syntax/Module/Name.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Type.hs
- compiler/ghc.cabal.in
- configure.ac
- distrib/configure.ac.in
- + docs/users_guide/10.2.1-notes.rst
- − docs/users_guide/9.16.1-notes.rst
- docs/users_guide/conf.py
- docs/users_guide/debug-info.rst
- docs/users_guide/eventlog-formats.rst
- docs/users_guide/extending_ghc.rst
- docs/users_guide/exts/control.rst
- docs/users_guide/exts/explicit_namespaces.rst
- docs/users_guide/exts/linear_types.rst
- + docs/users_guide/exts/modifiers.rst
- docs/users_guide/exts/pragmas.rst
- + docs/users_guide/exts/qualified_strings.rst
- docs/users_guide/exts/recursive_do.rst
- docs/users_guide/exts/required_type_arguments.rst
- docs/users_guide/exts/rewrite_rules.rst
- docs/users_guide/exts/stolen_syntax.rst
- docs/users_guide/exts/syntax.rst
- docs/users_guide/exts/template_haskell.rst
- docs/users_guide/ghc_config.py.in
- − docs/users_guide/ghc_packages.py
- docs/users_guide/ghci.rst
- docs/users_guide/javascript.rst
- docs/users_guide/packages.rst
- docs/users_guide/phases.rst
- docs/users_guide/profiling.rst
- docs/users_guide/release-notes.rst
- docs/users_guide/runtime_control.rst
- docs/users_guide/using-optimisation.rst
- docs/users_guide/using-warnings.rst
- docs/users_guide/using.rst
- docs/users_guide/utils.py
- docs/users_guide/wasm.rst
- ghc/GHC/Driver/Session/Mode.hs
- ghc/GHCi/Leak.hs
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Info.hs
- ghc/Main.hs
- ghc/ghc-bin.cabal.in
- hadrian/README.md
- hadrian/bindist/Makefile
- 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-9_12_1.json
- hadrian/bootstrap/plan-9_12_2.json
- + hadrian/bootstrap/plan-9_14_1.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/bootstrap/plan-bootstrap-9_12_1.json
- hadrian/bootstrap/plan-bootstrap-9_12_2.json
- + hadrian/bootstrap/plan-bootstrap-9_14_1.json
- hadrian/build-cabal
- hadrian/build-cabal.bat
- hadrian/cabal.project
- hadrian/cfg/default.host.target.in
- hadrian/cfg/default.target.in
- hadrian/cfg/system.config.in
- hadrian/doc/flavours.md
- hadrian/doc/make.md
- hadrian/doc/testsuite.md
- hadrian/doc/user-settings.md
- hadrian/hadrian.cabal
- hadrian/src/Builder.hs
- hadrian/src/CommandLine.hs
- hadrian/src/Context.hs
- hadrian/src/Flavour.hs
- hadrian/src/Flavour/Type.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Builder/Ar.hs
- hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
- hadrian/src/Hadrian/Haskell/Cabal/Type.hs
- hadrian/src/Hadrian/Oracles/Path.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Main.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Packages.hs
- hadrian/src/Rules/BinaryDist.hs
- + hadrian/src/Rules/Changelog.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cabal.hs
- hadrian/src/Settings/Builders/GenPrimopCode.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/RunTest.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/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/stack.yaml
- libraries/array
- libraries/base/base.cabal.in
- libraries/base/changelog.md
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Arrow.hs
- libraries/base/src/Control/Concurrent.hs
- libraries/base/src/Control/Exception.hs
- libraries/base/src/Control/Monad.hs
- libraries/base/src/Control/Monad/IO/Class.hs
- libraries/base/src/Data/Array/Byte.hs
- libraries/base/src/Data/Bool.hs
- libraries/base/src/Data/Char.hs
- libraries/base/src/Data/Data.hs
- libraries/base/src/Data/Eq.hs
- libraries/base/src/Data/Fixed.hs
- libraries/base/src/Data/Functor/Classes.hs
- libraries/base/src/Data/Functor/Compose.hs
- libraries/base/src/Data/List.hs
- libraries/base/src/Data/List/NonEmpty.hs
- libraries/base/src/Data/List/NubOrdSet.hs
- libraries/base/src/Data/Semigroup.hs
- libraries/base/src/Data/Version.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/ByteOrder.hs
- libraries/base/src/GHC/Conc.hs
- libraries/base/src/GHC/Conc/Sync.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- libraries/base/src/GHC/IO/Handle.hs
- libraries/base/src/GHC/RTS/Flags.hs
- libraries/base/src/GHC/ResponseFile.hs
- libraries/base/src/GHC/Stats.hs
- libraries/base/src/GHC/Unicode.hs
- libraries/base/src/GHC/Weak.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- libraries/base/src/Numeric.hs
- libraries/base/src/Prelude.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/Mem/Weak.hs
- libraries/base/src/System/Timeout.hs
- libraries/base/src/Text/Printf.hs
- libraries/base/src/Text/Read.hs
- libraries/base/tests/IO/T17912.hs
- libraries/base/tests/IO/T18832.hs
- libraries/base/tests/IO/all.T
- libraries/base/tests/enum01.stdout
- libraries/base/tests/enum01.stdout-alpha-dec-osf3
- libraries/base/tests/enum01.stdout-ws-64
- + libraries/base/tests/perf/ElemFusionUnknownList.hs
- + libraries/base/tests/perf/ElemFusionUnknownList_O1.stderr
- + libraries/base/tests/perf/ElemFusionUnknownList_O2.stderr
- + libraries/base/tests/perf/ElemNoFusion.hs
- + libraries/base/tests/perf/ElemNoFusion_O1.stderr
- + libraries/base/tests/perf/ElemNoFusion_O2.stderr
- libraries/base/tests/perf/T17752.hs
- − libraries/base/tests/perf/T17752.stdout
- + libraries/base/tests/perf/T17752_O1.stderr
- + libraries/base/tests/perf/T17752_O2.stderr
- libraries/base/tests/perf/all.T
- libraries/deepseq
- libraries/directory
- libraries/exceptions
- libraries/file-io
- libraries/filepath
- libraries/ghc-bignum/ghc-bignum.cabal
- libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
- libraries/ghc-boot-th/ghc-boot-th.cabal.in
- + libraries/ghc-boot/GHC/Data/ShortByteString.hs
- libraries/ghc-boot/GHC/Data/SizedSeq.hs
- compiler/GHC/Data/SmallArray.hs → libraries/ghc-boot/GHC/Data/SmallArray.hs
- libraries/ghc-boot/GHC/Settings/Utils.hs
- libraries/ghc-boot/GHC/Unit/Database.hs
- libraries/ghc-boot/ghc-boot.cabal.in
- libraries/ghc-compact/ghc-compact.cabal
- libraries/ghc-experimental/CHANGELOG.md
- libraries/ghc-experimental/ghc-experimental.cabal.in
- libraries/ghc-experimental/src/Data/Sum/Experimental.hs
- libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
- libraries/ghc-experimental/src/GHC/Profiling/Eras.hs
- libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs
- + libraries/ghc-experimental/src/GHC/Stack/Decode/Experimental.hs
- + libraries/ghc-experimental/tests/Makefile
- libraries/base/src/GHC/Weak/Finalizehs → libraries/ghc-experimental/tests/all.T
- libraries/base/tests/perf/Makefile → 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-heap/tests/tso_and_stack_closures.hs
- libraries/ghc-internal/CHANGELOG.md
- libraries/ghc-internal/bignum-backend.rst
- libraries/ghc-internal/cbits/Stack.cmm
- libraries/ghc-internal/codepages/MakeTable.hs
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/include/CTypes.h
- libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
- libraries/ghc-internal/src/GHC/Internal/Arr.hs
- libraries/ghc-internal/src/GHC/Internal/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Check.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/FFI.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
- − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Selected.hs
- libraries/ghc-internal/src/GHC/Internal/Bits.hs
- libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs
- − libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Char.hs
- libraries/ghc-internal/src/GHC/Internal/Clock.hsc
- libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Bound.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/Signal.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
- libraries/ghc-internal/src/GHC/Internal/Control/Concurrent/MVar.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fail.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fix.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/IO/Class.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Bits.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/Dynamic.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Either.hs
- − libraries/ghc-internal/src/GHC/Internal/Data/Eq.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/Const.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Utils.hs
- libraries/ghc-internal/src/GHC/Internal/Data/IORef.hs
- libraries/ghc-internal/src/GHC/Internal/Data/List.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Monoid.hs
- libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Ord.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Proxy.hs
- libraries/ghc-internal/src/GHC/Internal/Data/STRef.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Semigroup/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Data/String.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Traversable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Bool.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Coercion.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Equality.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Typeable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Typeable/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Unique.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/Debug/Trace.hs
- libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Encoding/UTF8.hs
- libraries/ghc-internal/src/GHC/Internal/Enum.hs
- libraries/ghc-internal/src/GHC/Internal/Environment.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Array.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Control.hs
- libraries/ghc-internal/src/GHC/Internal/Event/EPoll.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/IntVar.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Internal/Types.hs
- libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Manager.hs
- libraries/ghc-internal/src/GHC/Internal/Event/PSQ.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Poll.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
- libraries/ghc-internal/src/GHC/Internal/Event/TimeOut.hs
- libraries/ghc-internal/src/GHC/Internal/Event/TimerManager.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Unique.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/Clock.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/ConsoleEvent.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/FFI.hsc
- 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
- libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
- libraries/ghc-internal/src/GHC/Internal/ExecutionStack.hs
- libraries/ghc-internal/src/GHC/Internal/ExecutionStack/Internal.hsc
- libraries/ghc-internal/src/GHC/Internal/Exts.hs
- libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs
- libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Fingerprint/Type.hs
- libraries/ghc-internal/src/GHC/Internal/Float.hs
- libraries/ghc-internal/src/GHC/Internal/Float/ConversionUtils.hs
- libraries/ghc-internal/src/GHC/Internal/Float/RealFracMethods.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/ConstPtr.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/Error.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/String.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/String/Encoding.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/C/Types.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/ForeignPtr/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Alloc.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Array.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Error.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Pool.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Utils.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Ptr.hs
- libraries/ghc-internal/src/GHC/Internal/Foreign/Storable.hs
- libraries/ghc-internal/src/GHC/Internal/ForeignPtr.hs
- libraries/ghc-internal/src/GHC/Internal/ForeignSrcLang.hs
- libraries/ghc-internal/src/GHC/Internal/Functor/ZipList.hs
- libraries/ghc-internal/src/GHC/Internal/GHCi.hs
- libraries/ghc-internal/src/GHC/Internal/GHCi/Helpers.hs
- libraries/ghc-internal/src/GHC/Internal/Generics.hs
- libraries/ghc-internal/src/GHC/Internal/Heap/Closures.hs
- libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable.hsc
- libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable/Types.hsc
- libraries/ghc-internal/src/GHC/Internal/Heap/InfoTableProf.hsc
- libraries/ghc-internal/src/GHC/Internal/Heap/ProfInfo/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Buffer.hs
- libraries/ghc-internal/src/GHC/Internal/IO/BufferedIO.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Device.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/API.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/Table.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Failure.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Iconv.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Latin1.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF16.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF32.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF8.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs-boot
- libraries/ghc-internal/src/GHC/Internal/IO/FD.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/FD.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Internals.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Flock.hsc
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/LinuxOFD.hsc
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/NoOp.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs
- − libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs-boot
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Windows.hs
- libraries/ghc-internal/src/GHC/Internal/IO/IOMode.hs
- libraries/ghc-internal/src/GHC/Internal/IO/SubSystem.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Unsafe.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Windows/Encoding.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
- libraries/ghc-internal/src/GHC/Internal/IOArray.hs
- libraries/ghc-internal/src/GHC/Internal/IORef.hs
- libraries/ghc-internal/src/GHC/Internal/InfoProv.hs
- libraries/ghc-internal/src/GHC/Internal/InfoProv/Types.hsc
- libraries/ghc-internal/src/GHC/Internal/Int.hs
- libraries/ghc-internal/src/GHC/Internal/IsList.hs
- libraries/ghc-internal/src/GHC/Internal/Ix.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Foreign/Callback.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Prim.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal/Build.hs
- libraries/ghc-internal/src/GHC/Internal/LanguageExtensions.hs
- libraries/ghc-internal/src/GHC/Internal/Lexeme.hs
- libraries/ghc-internal/src/GHC/Internal/List.hs
- libraries/ghc-internal/src/GHC/Internal/MVar.hs
- libraries/ghc-internal/src/GHC/Internal/Magic.hs
- libraries/ghc-internal/src/GHC/Internal/Natural.hs
- libraries/ghc-internal/src/GHC/Internal/Num.hs
- libraries/ghc-internal/src/GHC/Internal/Numeric.hs
- libraries/ghc-internal/src/GHC/Internal/OverloadedLabels.hs
- libraries/ghc-internal/src/GHC/Internal/Pack.hs
- + libraries/ghc-internal/src/GHC/Internal/Prim.hs
- libraries/ghc-internal/src/GHC/Internal/Profiling.hs
- libraries/ghc-internal/src/GHC/Internal/Ptr.hs
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags/Test.hsc
- libraries/ghc-internal/src/GHC/Internal/Read.hs
- libraries/ghc-internal/src/GHC/Internal/Real.hs
- − libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs
- libraries/ghc-internal/src/GHC/Internal/ST.hs
- libraries/ghc-internal/src/GHC/Internal/STM.hs
- libraries/ghc-internal/src/GHC/Internal/STRef.hs
- libraries/ghc-internal/src/GHC/Internal/Show.hs
- libraries/ghc-internal/src/GHC/Internal/Stable.hs
- libraries/ghc-internal/src/GHC/Internal/StableName.hs
- libraries/ghc-internal/src/GHC/Internal/Stack.hs
- libraries/ghc-internal/src/GHC/Internal/Stack.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Stack/Annotation.hs
- libraries/ghc-internal/src/GHC/Internal/Stack/CCS.hsc
- libraries/ghc-internal/src/GHC/Internal/Stack/CloneStack.hs
- libraries/ghc-internal/src/GHC/Internal/Stack/Constants.hsc
- libraries/ghc-internal/src/GHC/Internal/Stack/ConstantsProf.hsc
- libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
- libraries/ghc-internal/src/GHC/Internal/StaticPtr.hs
- libraries/ghc-internal/src/GHC/Internal/StaticPtr/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Stats.hsc
- libraries/ghc-internal/src/GHC/Internal/Storable.hs
- libraries/ghc-internal/src/GHC/Internal/System/Environment.hs
- libraries/ghc-internal/src/GHC/Internal/System/Environment/Blank.hsc
- libraries/ghc-internal/src/GHC/Internal/System/Environment/ExecutablePath.hsc
- − libraries/ghc-internal/src/GHC/Internal/System/Exit.hs
- libraries/ghc-internal/src/GHC/Internal/System/IO.hs
- libraries/ghc-internal/src/GHC/Internal/System/IO/Error.hs
- − libraries/ghc-internal/src/GHC/Internal/System/IO/OS.hs
- libraries/ghc-internal/src/GHC/Internal/System/Mem.hs
- libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
- libraries/ghc-internal/src/GHC/Internal/System/Posix/Types.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/TH/Syntax.hs
- libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadP.hs
- libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadPrec.hs
- − libraries/ghc-internal/src/GHC/Internal/Text/Read.hs
- libraries/ghc-internal/src/GHC/Internal/Text/Read/Lex.hs
- libraries/ghc-internal/src/GHC/Internal/TopHandler.hs
- libraries/ghc-internal/src/GHC/Internal/Tuple.hs
- libraries/ghc-internal/src/GHC/Internal/TypeError.hs
- libraries/ghc-internal/src/GHC/Internal/TypeLits.hs
- libraries/ghc-internal/src/GHC/Internal/TypeLits/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/TypeNats.hs
- libraries/ghc-internal/src/GHC/Internal/TypeNats/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Types.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Bits.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/DerivedCoreProperties.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/GeneralCategory.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleLowerCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleTitleCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleUpperCaseMapping.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Version.hs
- libraries/ghc-internal/src/GHC/Internal/Unsafe/Coerce.hs
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- + testsuite/tests/typecheck/should_run/T16981.hs
- + testsuite/tests/typecheck/should_run/T16981.stdout
- testsuite/tests/typecheck/should_run/T1735.hs
- testsuite/tests/typecheck/should_run/T1735_Help/Basics.hs
- + testsuite/tests/typecheck/should_run/T24773.hs
- + testsuite/tests/typecheck/should_run/T24773.stdout
- testsuite/tests/typecheck/should_run/T3731.hs
- testsuite/tests/typecheck/should_run/T9497a-run.stderr
- testsuite/tests/typecheck/should_run/T9497b-run.stderr
- testsuite/tests/typecheck/should_run/T9497c-run.stderr
- testsuite/tests/typecheck/should_run/all.T
- testsuite/tests/unboxedsums/all.T
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- + testsuite/tests/unboxedsums/unboxedsums4p.stderr
- testsuite/tests/unsatisfiable/T23816.stderr
- testsuite/tests/unsatisfiable/UnsatDefer.stderr
- + testsuite/tests/vdq-rta/should_compile/T26967.hs
- + testsuite/tests/vdq-rta/should_compile/T26967.stderr
- + testsuite/tests/vdq-rta/should_compile/T26967_tyop.hs
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- testsuite/tests/vdq-rta/should_compile/all.T
- testsuite/tests/vdq-rta/should_fail/T24159_type_syntax_th_fail.script
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- testsuite/tests/warnings/should_compile/all.T
- testsuite/tests/warnings/should_fail/CaretDiagnostics1.hs
- testsuite/tests/warnings/should_fail/CaretDiagnostics1.stderr
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- testsuite/tests/warnings/should_fail/T24396c.stderr
- testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs
- + utils/changelog-d/ChangelogD.hs
- + utils/changelog-d/LICENSE
- + utils/changelog-d/README.md
- + utils/changelog-d/changelog-d.cabal
- utils/check-exact/ExactPrint.hs
- utils/check-exact/Main.hs
- utils/check-exact/Parsers.hs
- utils/check-exact/Transform.hs
- utils/check-exact/Utils.hs
- utils/deriveConstants/Main.hs
- utils/genprimopcode/Main.hs
- utils/ghc-pkg/Main.hs
- utils/ghc-pkg/ghc-pkg.cabal.in
- utils/ghc-toolchain/exe/Main.hs
- utils/ghc-toolchain/src/GHC/Toolchain/Program.hs
- utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
- utils/haddock/doc/.gitignore
- utils/haddock/doc/Makefile
- + utils/haddock/doc/_static/haddock-custom.css
- utils/haddock/doc/conf.py
- utils/haddock/doc/markup.rst
- + utils/haddock/doc/snippets/.gitignore
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- + utils/haddock/doc/snippets/Makefile
- + utils/haddock/doc/snippets/Snippet-List-Bulleted.html
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- utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
- utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml.hs
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- utils/haddock/haddock-api/src/Haddock/Convert.hs
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- utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
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- utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
- utils/haddock/haddock-api/src/Haddock/Options.hs
- utils/haddock/haddock-api/src/Haddock/Types.hs
- utils/haddock/haddock-api/src/Haddock/Utils.hs
- utils/haddock/haddock-library/haddock-library.cabal
- utils/haddock/haddock-test/haddock-test.cabal
- utils/haddock/haddock.cabal
- utils/haddock/html-test/ref/A.html
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Teo Camarasu pushed to branch wip/abstract-q at Glasgow Haskell Compiler / GHC
Commits:
d9eda513 by Teo Camarasu at 2026-06-18T17:34:46+01:00
Make Q abstract
This patch aims to clearly demarcate the internal and external interfaces
of Q.
In the past the `Quasi` typeclass was both part of the external,
public-facing interface, and was used to give the implementation of `Q`.
Now we separate out these two distinct roles. `Quasi` continues to exist
in the public interface, but we introduce a new `MetaHandlers` type,
which is equivalent to `Dict Quasi`.
`Q a` is now defined to be `MetaHandlers -> IO a`, and, crucially,
the constructor and the new `MetaHandlers` type are not exposed from the
public interface.
This gives us the ability to vary the interface on the GHC side without
forcing a breaking change on the `template-haskell` side.
Similarly `template-haskell` has more freedom to change the `Quasi`
typeclass without needing any changes in `lib:ghc`.
Implements https://github.com/ghc-proposals/ghc-proposals/pull/70
Resolves #27341
- - - - -
9 changed files:
- + changelog.d/AbstractQ
- compiler/GHC/Data/IOEnv.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Gen/Splice.hs-boot
- libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
- libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
- libraries/ghci/GHCi/TH.hs
- libraries/template-haskell/Language/Haskell/TH/Syntax.hs
- testsuite/tests/interface-stability/template-haskell-exports.stdout
Changes:
=====================================
changelog.d/AbstractQ
=====================================
@@ -0,0 +1,9 @@
+section: template-haskell
+synopsis: Hide the implementation of Q
+description: The constructor of Q is now hidden.
+ This is done to improve the stability of ``template-haskell``.
+ To minimize breakage, we have added a new ``qRunQ`` operation to ``Quasi``.
+ The ``Quasi TcM`` instance is no longer exposed from the ``ghc`` API.
+ See the `GHC proposal <https://github.com/ghc-proposals/ghc-proposals/pull/700>`_ for more details.
+mrs: !15696
+issues: #27341
=====================================
compiler/GHC/Data/IOEnv.hs
=====================================
@@ -22,7 +22,7 @@ module GHC.Data.IOEnv (
IOEnvFailure(..),
-- Getting at the environment
- getEnv, setEnv, updEnv, updEnvIO,
+ getEnv, setEnv, updEnv, updEnvIO, withRunInIO,
runIOEnv, unsafeInterleaveM, uninterruptibleMaskM_,
tryM, tryAllM, tryMostM, fixM,
@@ -258,3 +258,12 @@ updEnv upd (IOEnv m) = IOEnv (\ env -> m (upd env))
updEnvIO :: (env -> IO env') -> IOEnv env' a -> IOEnv env a
{-# INLINE updEnvIO #-}
updEnvIO upd (IOEnv m) = IOEnv (\ env -> m =<< upd env)
+
+-- | 'withRunInIO' specialised to `IOEnv`.
+-- See https://hackage.haskell.org/package/unliftio-core/docs/Control-Monad-IO-Unl… for an explanation.
+withRunInIO:: forall env b. ((forall a. IOEnv env a -> IO a) -> IO b) -> IOEnv env b
+withRunInIO k = IOEnv $ \env ->
+ let
+ unlift :: forall a. IOEnv env a -> IO a
+ unlift (IOEnv m) = m env
+ in k unlift
=====================================
compiler/GHC/Tc/Gen/Splice.hs
=====================================
@@ -25,7 +25,7 @@ module GHC.Tc.Gen.Splice(
tcTypedSplice, tcTypedBracket, tcUntypedBracket,
runAnnotation, getUntypedSpliceBody,
- runMetaE, runMetaP, runMetaT, runMetaD, runQuasi,
+ runMetaE, runMetaP, runMetaT, runMetaD, runQinTcM,
tcTopSpliceExpr, lookupThName_maybe,
defaultRunMeta, runMeta', runRemoteModFinalizers,
finishTH, runTopSplice
@@ -138,6 +138,7 @@ import qualified GHC.LanguageExtensions as LangExt
-- THSyntax gives access to internal functions and data types
import qualified GHC.Boot.TH.Syntax as TH
import qualified GHC.Boot.TH.Monad as TH
+import GHC.Boot.TH.Monad (MetaHandlers(..))
import qualified GHC.Boot.TH.Ppr as TH
#if defined(HAVE_INTERNAL_INTERPRETER)
@@ -1138,8 +1139,8 @@ convertAnnotationWrapper fhv = do
************************************************************************
-}
-runQuasi :: TH.Q a -> TcM a
-runQuasi act = TH.runQ act
+runQinTcM :: TH.Q a -> TcM a
+runQinTcM (TH.Q act) = withRunInIO $ \runInIO -> act (metaHandlersTcM runInIO)
runRemoteModFinalizers :: ThModFinalizers -> TcM ()
runRemoteModFinalizers (ThModFinalizers finRefs) = do
@@ -1152,7 +1153,7 @@ runRemoteModFinalizers (ThModFinalizers finRefs) = do
#if defined(HAVE_INTERNAL_INTERPRETER)
InternalInterp -> do
qs <- liftIO (withForeignRefs finRefs $ mapM localRef)
- runQuasi $ sequence_ qs
+ runQinTcM $ sequence_ qs
#endif
ExternalInterp ext -> withExtInterp ext $ \inst -> do
@@ -1466,70 +1467,14 @@ when showing an error message.
To call runQ in the Tc monad, we need to make TcM an instance of Quasi:
-}
-instance TH.Quasi TcM where
- qNewName s = do { u <- newUnique
- ; let i = toInteger (getKey u)
- ; return (TH.mkNameU s i) }
+-- 'msg' is forced to ensure exceptions don't escape,
+-- see Note [Exceptions in TH]
+report :: Bool -> [Char] -> TcM ()
+report True msg = seqList msg $ addErr $ TcRnTHError $ ReportCustomQuasiError True msg
+report False msg = seqList msg $ addDiagnostic $ TcRnTHError $ ReportCustomQuasiError False msg
- -- 'msg' is forced to ensure exceptions don't escape,
- -- see Note [Exceptions in TH]
- qReport True msg = seqList msg $ addErr $ TcRnTHError $ ReportCustomQuasiError True msg
- qReport False msg = seqList msg $ addDiagnostic $ TcRnTHError $ ReportCustomQuasiError False msg
-
- qLocation :: TcM TH.Loc
- qLocation = do { m <- getModule
- ; l <- getSrcSpanM
- ; r <- case l of
- RealSrcSpan s _ -> return s
- GeneratedSrcSpan{} -> pprPanic "qLocation: generatedSrcSpan"
- (pprGeneratedSrcSpanDetails)
- UnhelpfulSpan _ -> pprPanic "qLocation: Unhelpful location"
- (ppr l)
- ; return (TH.Loc { TH.loc_filename = unpackFS (srcSpanFile r)
- , TH.loc_module = moduleNameString (moduleName m)
- , TH.loc_package = unitString (moduleUnit m)
- , TH.loc_start = (srcSpanStartLine r, srcSpanStartCol r)
- , TH.loc_end = (srcSpanEndLine r, srcSpanEndCol r) }) }
-
- qLookupName = lookupName
- qReify = reify
- qReifyFixity nm = lookupThName nm >>= reifyFixity
- qReifyType = reifyTypeOfThing
- qReifyInstances = reifyInstances
- qReifyRoles = reifyRoles
- qReifyAnnotations = reifyAnnotations
- qReifyModule = reifyModule
- qReifyConStrictness nm = do { nm' <- lookupThName nm
- ; dc <- tcLookupDataCon nm'
- ; let bangs = dataConImplBangs dc
- ; return (map reifyDecidedStrictness bangs) }
-
- -- For qRecover, discard error messages if
- -- the recovery action is chosen. Otherwise
- -- we'll only fail higher up.
- qRecover recover main = tryTcDiscardingErrs recover main
-
- qGetPackageRoot = do
- dflags <- getDynFlags
- return $ fromMaybe "." (workingDirectory dflags)
-
- qAddDependentFile fp = do
- ref <- fmap tcg_dependent_files getGblEnv
- dep_files <- readTcRef ref
- writeTcRef ref (fp:dep_files)
-
- qAddDependentDirectory dp = do
- ref <- fmap tcg_dependent_dirs getGblEnv
- dep_dirs <- readTcRef ref
- writeTcRef ref (dp:dep_dirs)
-
- qAddTempFile suffix = do
- dflags <- getDynFlags
- logger <- getLogger
- tmpfs <- hsc_tmpfs <$> getTopEnv
- liftIO $ newTempName logger tmpfs (tmpDir dflags) TFL_GhcSession suffix
-
- qAddTopDecls thds = do
+addTopDecls :: [TH.Dec] -> TcM ()
+addTopDecls thds = do
exts <- fmap extensionFlags getDynFlags
l <- getSrcSpanM
th_origin <- getThSpliceOrigin
@@ -1557,52 +1502,13 @@ instance TH.Quasi TcM where
bindName :: RdrName -> TcM ()
bindName (Exact n)
= do { th_topnames_var <- fmap tcg_th_topnames getGblEnv
- ; updTcRef th_topnames_var (\ns -> extendNameSet ns n)
- }
+ ; updTcRef th_topnames_var (\ns -> extendNameSet ns n)
+ }
bindName name = addErr $ TcRnTHError $ THNameError $ NonExactName name
- qAddForeignFilePath lang fp = do
- var <- fmap tcg_th_foreign_files getGblEnv
- updTcRef var ((lang, fp) :)
-
- qAddModFinalizer fin = do
- r <- liftIO $ mkRemoteRef fin
- fref <- liftIO $ mkForeignRef r (freeRemoteRef r)
- addModFinalizerRef fref
-
- qAddCorePlugin plugin = do
- hsc_env <- getTopEnv
- let fc = hsc_FC hsc_env
- let home_unit = hsc_home_unit hsc_env
- let dflags = hsc_dflags hsc_env
- let fopts = initFinderOpts dflags
- r <- liftIO $ findHomeModule fc fopts home_unit (mkModuleName plugin)
- let err = TcRnTHError $ AddInvalidCorePlugin plugin
- case r of
- Found {} -> addErr err
- FoundMultiple {} -> addErr err
- _ -> return ()
- th_coreplugins_var <- tcg_th_coreplugins <$> getGblEnv
- updTcRef th_coreplugins_var (plugin:)
-
- qGetQ :: forall a. Typeable a => TcM (Maybe a)
- qGetQ = do
- th_state_var <- fmap tcg_th_state getGblEnv
- th_state <- readTcRef th_state_var
- -- See #10596 for why we use a scoped type variable here.
- return (Map.lookup (typeRep (Proxy :: Proxy a)) th_state >>= fromDynamic)
-
- qPutQ x = do
- th_state_var <- fmap tcg_th_state getGblEnv
- updTcRef th_state_var (\m -> Map.insert (typeOf x) (toDyn x) m)
-
- qIsExtEnabled = xoptM
-
- qExtsEnabled =
- EnumSet.toList . extensionFlags . hsc_dflags <$> getTopEnv
-
- qPutDoc doc_loc s = do
+putDoc :: TH.DocLoc -> String -> TcM ()
+putDoc doc_loc s = do
th_doc_var <- tcg_th_docs <$> getGblEnv
resolved_doc_loc <- resolve_loc doc_loc
is_local <- checkLocalName resolved_doc_loc
@@ -1624,15 +1530,131 @@ instance TH.Quasi TcM where
checkLocalName (InstDoc n) = nameIsLocalOrFrom <$> getModule <*> pure n
checkLocalName ModuleDoc = pure True
-
- qGetDoc (TH.DeclDoc n) = lookupThName n >>= lookupDeclDoc
- qGetDoc (TH.InstDoc t) = lookupThInstName t >>= lookupDeclDoc
- qGetDoc (TH.ArgDoc n i) = lookupThName n >>= lookupArgDoc i
- qGetDoc TH.ModuleDoc = do
+getDoc :: TH.DocLoc -> TcM (Maybe String)
+getDoc (TH.DeclDoc n) = lookupThName n >>= lookupDeclDoc
+getDoc (TH.InstDoc t) = lookupThInstName t >>= lookupDeclDoc
+getDoc (TH.ArgDoc n i) = lookupThName n >>= lookupArgDoc i
+getDoc TH.ModuleDoc = do
df <- getDynFlags
docs <- getGblEnv >>= extractDocs df
return (renderHsDocString . hsDocString <$> (docs_mod_hdr =<< docs))
+getQ :: forall a. Typeable a => TcM (Maybe a)
+getQ = do
+ th_state_var <- fmap tcg_th_state getGblEnv
+ th_state <- readTcRef th_state_var
+ -- See #10596 for why we use a scoped type variable here.
+ return (Map.lookup (typeRep (Proxy :: Proxy a)) th_state >>= fromDynamic)
+
+location :: TcM TH.Loc
+location = do { m <- getModule
+ ; l <- getSrcSpanM
+ ; r <- case l of
+ RealSrcSpan s _ -> return s
+ GeneratedSrcSpan{} -> pprPanic "qLocation: generatedSrcSpan"
+ (pprGeneratedSrcSpanDetails)
+ UnhelpfulSpan _ -> pprPanic "qLocation: Unhelpful location"
+ (ppr l)
+ ; return (TH.Loc { TH.loc_filename = unpackFS (srcSpanFile r)
+ , TH.loc_module = moduleNameString (moduleName m)
+ , TH.loc_package = unitString (moduleUnit m)
+ , TH.loc_start = (srcSpanStartLine r, srcSpanStartCol r)
+ , TH.loc_end = (srcSpanEndLine r, srcSpanEndCol r) }) }
+
+metaHandlersTcM :: (forall x. TcM x -> IO x) -> TH.MetaHandlers
+metaHandlersTcM runInIO = TH.MetaHandlers {
+ mLiftIO = id
+ -- We are careful to use the TcM instance not the one for IO, since that would lead to a different error.
+ , mFail = \s -> runInIO $ fail @TcM s
+ , mNewName = \s -> runInIO $ do { u <- newUnique
+ ; let i = toInteger (getKey u)
+ ; return (TH.mkNameU s i) }
+
+ , mReport = fmap runInIO . report
+
+ , mLocation = runInIO location
+
+ , mLookupName = fmap runInIO . lookupName
+ , mReify = runInIO . reify
+ , mReifyFixity = \nm -> runInIO $ lookupThName nm >>= reifyFixity
+ , mReifyType = runInIO . reifyTypeOfThing
+ , mReifyInstances = fmap runInIO . reifyInstances
+ , mReifyRoles = runInIO . reifyRoles
+ , mReifyAnnotations = runInIO . reifyAnnotations
+ , mReifyModule = runInIO . reifyModule
+ , mReifyConStrictness = \nm -> runInIO $ do
+ { nm' <- lookupThName nm
+ ; dc <- tcLookupDataCon nm'
+ ; let bangs = dataConImplBangs dc
+ ; return (map reifyDecidedStrictness bangs) }
+
+ -- For qRecover, discard error messages if
+ -- the recovery action is chosen. Otherwise
+ -- we'll only fail higher up.
+ , mRecover = \recover main -> runInIO $ tryTcDiscardingErrs (runQinTcM recover) (runQinTcM main)
+
+ , mGetPackageRoot = runInIO $ do
+ dflags <- getDynFlags
+ return $ fromMaybe "." (workingDirectory dflags)
+
+ , mAddDependentFile = \fp -> runInIO $ do
+ ref <- fmap tcg_dependent_files getGblEnv
+ dep_files <- readTcRef ref
+ writeTcRef ref (fp:dep_files)
+
+ , mAddDependentDirectory = \dp -> runInIO $ do
+ ref <- fmap tcg_dependent_dirs getGblEnv
+ dep_dirs <- readTcRef ref
+ writeTcRef ref (dp:dep_dirs)
+
+ , mAddTempFile = \suffix -> runInIO $ do
+ dflags <- getDynFlags
+ logger <- getLogger
+ tmpfs <- hsc_tmpfs <$> getTopEnv
+ liftIO $ newTempName logger tmpfs (tmpDir dflags) TFL_GhcSession suffix
+
+ , mAddTopDecls = runInIO . addTopDecls
+
+ , mAddForeignFilePath = \lang fp -> runInIO $ do
+ var <- fmap tcg_th_foreign_files getGblEnv
+ updTcRef var ((lang, fp) :)
+
+ , mAddModFinalizer = \fin -> runInIO $ do
+ r <- liftIO $ mkRemoteRef fin
+ fref <- liftIO $ mkForeignRef r (freeRemoteRef r)
+ addModFinalizerRef fref
+
+ , mAddCorePlugin = \plugin -> runInIO $ do
+ hsc_env <- getTopEnv
+ let fc = hsc_FC hsc_env
+ let home_unit = hsc_home_unit hsc_env
+ let dflags = hsc_dflags hsc_env
+ let fopts = initFinderOpts dflags
+ r <- liftIO $ findHomeModule fc fopts home_unit (mkModuleName plugin)
+ let err = TcRnTHError $ AddInvalidCorePlugin plugin
+ case r of
+ Found {} -> addErr err
+ FoundMultiple {} -> addErr err
+ _ -> return ()
+ th_coreplugins_var <- tcg_th_coreplugins <$> getGblEnv
+ updTcRef th_coreplugins_var (plugin:)
+
+ , mGetQ = runInIO getQ
+
+ , mPutQ = \x -> runInIO $ do
+ th_state_var <- fmap tcg_th_state getGblEnv
+ updTcRef th_state_var (\m -> Map.insert (typeOf x) (toDyn x) m)
+
+ , mIsExtEnabled = runInIO . xoptM
+
+ , mExtsEnabled = runInIO $
+ EnumSet.toList . extensionFlags . hsc_dflags <$> getTopEnv
+
+ , mPutDoc = fmap runInIO . putDoc
+
+ , mGetDoc = runInIO . getDoc
+ }
+
-- | Looks up documentation for a declaration in first the current module,
-- otherwise tries to find it in another module via 'hscGetModuleInterface'.
lookupDeclDoc :: Name -> TcM (Maybe String)
@@ -1788,7 +1810,7 @@ runTH ty fhv = do
InternalInterp -> do
-- Run it in the local TcM
hv <- liftIO $ wormhole interp fhv
- r <- runQuasi (unsafeCoerce hv :: TH.Q a)
+ r <- runQinTcM (unsafeCoerce hv :: TH.Q a)
return r
#endif
@@ -1797,7 +1819,7 @@ runTH ty fhv = do
-- Remote GHCi, see Note [Remote Template Haskell] in
-- libraries/ghci/GHCi/TH.hs.
rstate <- getTHState inst
- loc <- TH.qLocation
+ loc <- location
-- run a remote TH request
r <- liftIO $
withForeignRef rstate $ \state_hv ->
@@ -1913,32 +1935,32 @@ wrapTHResult tcm = do
handleTHMessage :: THMessage a -> TcM a
handleTHMessage msg = case msg of
- NewName a -> wrapTHResult $ TH.qNewName a
- Report b str -> wrapTHResult $ TH.qReport b str
- LookupName b str -> wrapTHResult $ TH.qLookupName b str
- Reify n -> wrapTHResult $ TH.qReify n
- ReifyFixity n -> wrapTHResult $ TH.qReifyFixity n
- ReifyType n -> wrapTHResult $ TH.qReifyType n
- ReifyInstances n ts -> wrapTHResult $ TH.qReifyInstances n ts
- ReifyRoles n -> wrapTHResult $ TH.qReifyRoles n
+ NewName a -> wrapTHResult $ runQinTcM $ TH.newName a
+ Report b str -> wrapTHResult $ runQinTcM $ TH.report b str
+ LookupName b str -> wrapTHResult $ runQinTcM $ TH.lookupName b str
+ Reify n -> wrapTHResult $ runQinTcM $ TH.reify n
+ ReifyFixity n -> wrapTHResult $ runQinTcM $ TH.reifyFixity n
+ ReifyType n -> wrapTHResult $ runQinTcM $ TH.reifyType n
+ ReifyInstances n ts -> wrapTHResult $ runQinTcM $ TH.reifyInstances n ts
+ ReifyRoles n -> wrapTHResult $ runQinTcM $ TH.reifyRoles n
ReifyAnnotations lookup tyrep ->
wrapTHResult $ (map B.pack <$> getAnnotationsByTypeRep lookup tyrep)
- ReifyModule m -> wrapTHResult $ TH.qReifyModule m
- ReifyConStrictness nm -> wrapTHResult $ TH.qReifyConStrictness nm
- GetPackageRoot -> wrapTHResult $ TH.qGetPackageRoot
- AddDependentFile f -> wrapTHResult $ TH.qAddDependentFile f
- AddDependentDirectory d -> wrapTHResult $ TH.qAddDependentDirectory d
- AddTempFile s -> wrapTHResult $ TH.qAddTempFile s
+ ReifyModule m -> wrapTHResult $ runQinTcM $ TH.reifyModule m
+ ReifyConStrictness nm -> wrapTHResult $ runQinTcM $ TH.reifyConStrictness nm
+ GetPackageRoot -> wrapTHResult $ runQinTcM $ TH.getPackageRoot
+ AddDependentFile f -> wrapTHResult $ runQinTcM $ TH.addDependentFile f
+ AddDependentDirectory d -> wrapTHResult $ runQinTcM $ TH.addDependentDirectory d
+ AddTempFile s -> wrapTHResult $ runQinTcM $ TH.addTempFile s
AddModFinalizer r -> do
interp <- hscInterp <$> getTopEnv
wrapTHResult $ liftIO (mkFinalizedHValue interp r) >>= addModFinalizerRef
- AddCorePlugin str -> wrapTHResult $ TH.qAddCorePlugin str
- AddTopDecls decs -> wrapTHResult $ TH.qAddTopDecls decs
- AddForeignFilePath lang str -> wrapTHResult $ TH.qAddForeignFilePath lang str
- IsExtEnabled ext -> wrapTHResult $ TH.qIsExtEnabled ext
- ExtsEnabled -> wrapTHResult $ TH.qExtsEnabled
- PutDoc l s -> wrapTHResult $ TH.qPutDoc l s
- GetDoc l -> wrapTHResult $ TH.qGetDoc l
+ AddCorePlugin str -> wrapTHResult $ runQinTcM $ TH.addCorePlugin str
+ AddTopDecls decs -> wrapTHResult $ runQinTcM $ TH.addTopDecls decs
+ AddForeignFilePath lang str -> wrapTHResult $ runQinTcM $ TH.addForeignFilePath lang str
+ IsExtEnabled ext -> wrapTHResult $ runQinTcM $ TH.isExtEnabled ext
+ ExtsEnabled -> wrapTHResult $ runQinTcM $ TH.extsEnabled
+ PutDoc l s -> wrapTHResult $ runQinTcM $ TH.putDoc l s
+ GetDoc l -> wrapTHResult $ runQinTcM $ TH.getDoc l
FailIfErrs -> wrapTHResult failIfErrsM
_ -> panic ("handleTHMessage: unexpected message " ++ show msg)
=====================================
compiler/GHC/Tc/Gen/Splice.hs-boot
=====================================
@@ -42,6 +42,6 @@ runMetaT :: LHsExpr GhcTc -> TcM (LHsType GhcPs)
runMetaD :: LHsExpr GhcTc -> TcM [LHsDecl GhcPs]
lookupThName_maybe :: TH.Name -> TcM (Maybe Name)
-runQuasi :: TH.Q a -> TcM a
+runQinTcM :: TH.Q a -> TcM a
runRemoteModFinalizers :: ThModFinalizers -> TcM ()
finishTH :: TcM ()
=====================================
libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
=====================================
@@ -1079,7 +1079,7 @@ withDecDoc :: String -> Q Dec -> Q Dec
withDecDoc doc dec = do
dec' <- dec
case doc_loc dec' of
- Just loc -> qAddModFinalizer $ qPutDoc loc doc
+ Just loc -> addModFinalizer $ putDoc loc doc
Nothing -> pure ()
pure dec'
where
@@ -1128,7 +1128,7 @@ funD_doc :: Name -> [Q Clause]
-> [Maybe String] -- ^ Documentation to attach to arguments
-> Q Dec
funD_doc nm cs mfun_doc arg_docs = do
- qAddModFinalizer $ sequence_
+ addModFinalizer $ sequence_
[putDoc (ArgDoc nm i) s | (i, Just s) <- zip [0..] arg_docs]
let dec = funD nm cs
case mfun_doc of
@@ -1145,7 +1145,7 @@ dataD_doc :: Q Cxt -> Name -> [Q (TyVarBndr BndrVis)] -> Maybe (Q Kind)
-- ^ Documentation to attach to the data declaration
-> Q Dec
dataD_doc ctxt tc tvs ksig cons_with_docs derivs mdoc = do
- qAddModFinalizer $ mapM_ docCons cons_with_docs
+ addModFinalizer $ mapM_ docCons cons_with_docs
let dec = dataD ctxt tc tvs ksig (map (\(con, _, _) -> con) cons_with_docs) derivs
maybe dec (flip withDecDoc dec) mdoc
@@ -1159,7 +1159,7 @@ newtypeD_doc :: Q Cxt -> Name -> [Q (TyVarBndr BndrVis)] -> Maybe (Q Kind)
-- ^ Documentation to attach to the newtype declaration
-> Q Dec
newtypeD_doc ctxt tc tvs ksig con_with_docs@(con, _, _) derivs mdoc = do
- qAddModFinalizer $ docCons con_with_docs
+ addModFinalizer $ docCons con_with_docs
let dec = newtypeD ctxt tc tvs ksig con derivs
maybe dec (flip withDecDoc dec) mdoc
@@ -1172,7 +1172,7 @@ typeDataD_doc :: Name -> [Q (TyVarBndr BndrVis)] -> Maybe (Q Kind)
-- ^ Documentation to attach to the data declaration
-> Q Dec
typeDataD_doc tc tvs ksig cons_with_docs mdoc = do
- qAddModFinalizer $ mapM_ docCons cons_with_docs
+ addModFinalizer $ mapM_ docCons cons_with_docs
let dec = typeDataD tc tvs ksig (map (\(con, _, _) -> con) cons_with_docs)
maybe dec (flip withDecDoc dec) mdoc
@@ -1186,7 +1186,7 @@ dataInstD_doc :: Q Cxt -> (Maybe [Q (TyVarBndr ())]) -> Q Type -> Maybe (Q Kind)
-- ^ Documentation to attach to the instance declaration
-> Q Dec
dataInstD_doc ctxt mb_bndrs ty ksig cons_with_docs derivs mdoc = do
- qAddModFinalizer $ mapM_ docCons cons_with_docs
+ addModFinalizer $ mapM_ docCons cons_with_docs
let dec = dataInstD ctxt mb_bndrs ty ksig (map (\(con, _, _) -> con) cons_with_docs)
derivs
maybe dec (flip withDecDoc dec) mdoc
@@ -1202,7 +1202,7 @@ newtypeInstD_doc :: Q Cxt -> (Maybe [Q (TyVarBndr ())]) -> Q Type
-- ^ Documentation to attach to the instance declaration
-> Q Dec
newtypeInstD_doc ctxt mb_bndrs ty ksig con_with_docs@(con, _, _) derivs mdoc = do
- qAddModFinalizer $ docCons con_with_docs
+ addModFinalizer $ docCons con_with_docs
let dec = newtypeInstD ctxt mb_bndrs ty ksig con derivs
maybe dec (flip withDecDoc dec) mdoc
@@ -1212,7 +1212,7 @@ patSynD_doc :: Name -> Q PatSynArgs -> Q PatSynDir -> Q Pat
-> [Maybe String] -- ^ Documentation to attach to the pattern arguments
-> Q Dec
patSynD_doc name args dir pat mdoc arg_docs = do
- qAddModFinalizer $ sequence_
+ addModFinalizer $ sequence_
[putDoc (ArgDoc name i) s | (i, Just s) <- zip [0..] arg_docs]
let dec = patSynD name args dir pat
maybe dec (flip withDecDoc dec) mdoc
=====================================
libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
=====================================
@@ -29,13 +29,13 @@ import Data.Data hiding (Fixity(..))
import Data.IORef
import System.IO.Unsafe (unsafePerformIO)
import Control.Monad.IO.Class (MonadIO (..))
-import System.IO (FilePath, hPutStrLn, stderr)
+import System.IO (hPutStrLn, stderr)
import qualified Data.Kind as Kind (Type)
import GHC.Types (TYPE, RuntimeRep(..))
#else
import GHC.Internal.Base (
Applicative(..), Functor(..), Monad(..), Monoid(..), Semigroup(..), String,
- flip, id, (.), (++),
+ flip, id, (.), (++), ($),
)
import GHC.Internal.Classes (not)
import GHC.Internal.Data.Data hiding (Fixity(..))
@@ -59,145 +59,150 @@ import GHC.Internal.ForeignSrcLang
import GHC.Internal.LanguageExtensions
import GHC.Internal.TH.Syntax
------------------------------------------------------
---
--- The Quasi class
---
------------------------------------------------------
-
-class (MonadIO m, MonadFail m) => Quasi m where
- -- | Fresh names. See 'newName'.
- qNewName :: String -> m Name
-
- ------- Error reporting and recovery -------
- -- | Report an error (True) or warning (False)
- -- ...but carry on; use 'fail' to stop. See 'report'.
- qReport :: Bool -> String -> m ()
-
- -- | See 'recover'.
- qRecover :: m a -- ^ the error handler
- -> m a -- ^ action which may fail
- -> m a -- ^ Recover from the monadic 'fail'
-
- ------- Inspect the type-checker's environment -------
- -- | True <=> type namespace, False <=> value namespace. See 'lookupName'.
- qLookupName :: Bool -> String -> m (Maybe Name)
- -- | See 'reify'.
- qReify :: Name -> m Info
- -- | See 'reifyFixity'.
- qReifyFixity :: Name -> m (Maybe Fixity)
- -- | See 'reifyType'.
- qReifyType :: Name -> m Type
- -- | Is (n tys) an instance? Returns list of matching instance Decs (with
- -- empty sub-Decs) Works for classes and type functions. See 'reifyInstances'.
- qReifyInstances :: Name -> [Type] -> m [Dec]
- -- | See 'reifyRoles'.
- qReifyRoles :: Name -> m [Role]
- -- | See 'reifyAnnotations'.
- qReifyAnnotations :: Data a => AnnLookup -> m [a]
- -- | See 'reifyModule'.
- qReifyModule :: Module -> m ModuleInfo
- -- | See 'reifyConStrictness'.
- qReifyConStrictness :: Name -> m [DecidedStrictness]
-
- -- | See 'location'.
- qLocation :: m Loc
-
- -- | Input/output (dangerous). See 'runIO'.
- qRunIO :: IO a -> m a
- qRunIO = liftIO
- -- | See 'getPackageRoot'.
- qGetPackageRoot :: m FilePath
-
- -- | See 'addDependentFile'.
- qAddDependentFile :: FilePath -> m ()
-
- -- | See 'addDependentDirectory'.
- qAddDependentDirectory :: FilePath -> m ()
-
- -- | See 'addTempFile'.
- qAddTempFile :: String -> m FilePath
-
- -- | See 'addTopDecls'.
- qAddTopDecls :: [Dec] -> m ()
-
- -- | See 'addForeignFilePath'.
- qAddForeignFilePath :: ForeignSrcLang -> String -> m ()
-
- -- | See 'addModFinalizer'.
- qAddModFinalizer :: Q () -> m ()
-
- -- | See 'addCorePlugin'.
- qAddCorePlugin :: String -> m ()
-
- -- | See 'getQ'.
- qGetQ :: Typeable a => m (Maybe a)
-
- -- | See 'putQ'.
- qPutQ :: Typeable a => a -> m ()
-
- -- | See 'isExtEnabled'.
- qIsExtEnabled :: Extension -> m Bool
- -- | See 'extsEnabled'.
- qExtsEnabled :: m [Extension]
-
- -- | See 'putDoc'.
- qPutDoc :: DocLoc -> String -> m ()
- -- | See 'getDoc'.
- qGetDoc :: DocLoc -> m (Maybe String)
+-- | 'MetaHandlers' defines the interface between GHC and TH splices.
+-- This is an internal interface between two parts of the compiler,
+-- and should never be directly exposed to users.
+--
+-- It mirrors the 'Quasi' typeclass, which is part of the public facing interface of TH.
+-- With time the two interfaces may drift apart.
+--
+-- This type is defined in `ghc-internal` rather than `lib:ghc` to avoid
+-- `template-haskell` having to depend on GHC, ie, it implements dependency inversion.
+--
+-- For more information about the historical design of this interface,
+-- see: https://github.com/ghc-proposals/ghc-proposals/pull/700
+data MetaHandlers = MetaHandlers {
+ -- | We have an explicit handler for liftIO to allow users to forbid lifting into 'IO'
+ mLiftIO :: forall a. IO a -> IO a
+ , mFail :: forall a. String -> IO a
+ -- | Fresh names. See 'newName'.
+ , mNewName :: String -> IO Name
+
+ ------- Error reporting and recovery -------
+ -- | Report an error (True) or warning (False)
+ -- ...but carry on; use 'fail' to stop. See 'report'.
+ , mReport :: Bool -> String -> IO ()
+
+ -- | See 'recover'.
+ , mRecover :: forall a. Q a -- ^ the error handler
+ -> Q a -- ^ action which may fail
+ -> IO a -- ^ Recover from the monadic 'fail'
+
+ ------- Inspect the type-checker's environment -------
+ -- | True <=> type namespace, False <=> value namespace. See 'lookupName'.
+ , mLookupName :: Bool -> String -> IO (Maybe Name)
+ -- | See 'reify'.
+ , mReify :: Name -> IO Info
+ -- | See 'reifyFixity'.
+ , mReifyFixity :: Name -> IO (Maybe Fixity)
+ -- | See 'reifyType'.
+ , mReifyType :: Name -> IO Type
+ -- | Is (n tys) an instance? Returns list of matching instance Decs (with
+ -- empty sub-Decs) Works for classes and type functions. See 'reifyInstances'.
+ , mReifyInstances :: Name -> [Type] -> IO [Dec]
+ -- | See 'reifyRoles'.
+ , mReifyRoles :: Name -> IO [Role]
+ -- | See 'reifyAnnotations'.
+ , mReifyAnnotations :: forall a. Data a => AnnLookup -> IO [a]
+ -- | See 'reifyModule'.
+ , mReifyModule :: Module -> IO ModuleInfo
+ -- | See 'reifyConStrictness'.
+ , mReifyConStrictness :: Name -> IO [DecidedStrictness]
+
+ -- | See 'location'.
+ , mLocation :: IO Loc
+
+ -- | See 'getPackageRoot'.
+ , mGetPackageRoot :: IO FilePath
+
+ -- | See 'addDependentFile'.
+ , mAddDependentFile :: FilePath -> IO ()
+
+ -- | See 'addDependentDirectory'.
+ , mAddDependentDirectory :: FilePath -> IO ()
+
+ -- | See 'addTempFile'.
+ , mAddTempFile :: String -> IO FilePath
+
+ -- | See 'addTopDecls'.
+ , mAddTopDecls :: [Dec] -> IO ()
+
+ -- | See 'addForeignFilePath'.
+ , mAddForeignFilePath :: ForeignSrcLang -> String -> IO ()
+
+ -- | See 'addModFinalizer'.
+ , mAddModFinalizer :: Q () -> IO ()
+
+ -- | See 'addCorePlugin'.
+ , mAddCorePlugin :: String -> IO ()
+
+ -- | See 'getQ'.
+ , mGetQ :: forall a. Typeable a => IO (Maybe a)
+
+ -- | See 'putQ'.
+ , mPutQ :: forall a. Typeable a => a -> IO ()
+
+ -- | See 'isExtEnabled'.
+ , mIsExtEnabled :: Extension -> IO Bool
+ -- | See 'extsEnabled'.
+ , mExtsEnabled :: IO [Extension]
+
+ -- | See 'putDoc'.
+ , mPutDoc :: DocLoc -> String -> IO ()
+ -- | See 'getDoc'.
+ , mGetDoc :: DocLoc -> IO (Maybe String)
+ }
------------------------------------------------------
--- The IO instance of Quasi
------------------------------------------------------
+badIO :: String -> IO a
+badIO op = do { hPutStrLn stderr ("Can't do `" ++ op ++ "' in the IO monad")
+ ; fail "Template Haskell failure" }
--- | This instance is used only when running a Q
--- computation in the IO monad, usually just to
--- print the result. There is no interesting
--- type environment, so reification isn't going to
--- work.
-instance Quasi IO where
- qNewName = newNameIO
-
- qReport True msg = hPutStrLn stderr ("Template Haskell error: " ++ msg)
- qReport False msg = hPutStrLn stderr ("Template Haskell error: " ++ msg)
-
- qLookupName _ _ = badIO "lookupName"
- qReify _ = badIO "reify"
- qReifyFixity _ = badIO "reifyFixity"
- qReifyType _ = badIO "reifyFixity"
- qReifyInstances _ _ = badIO "reifyInstances"
- qReifyRoles _ = badIO "reifyRoles"
- qReifyAnnotations _ = badIO "reifyAnnotations"
- qReifyModule _ = badIO "reifyModule"
- qReifyConStrictness _ = badIO "reifyConStrictness"
- qLocation = badIO "currentLocation"
- qRecover _ _ = badIO "recover" -- Maybe we could fix this?
- qGetPackageRoot = badIO "getProjectRoot"
- qAddDependentFile _ = badIO "addDependentFile"
- qAddTempFile _ = badIO "addTempFile"
- qAddTopDecls _ = badIO "addTopDecls"
- qAddForeignFilePath _ _ = badIO "addForeignFilePath"
- qAddModFinalizer _ = badIO "addModFinalizer"
- qAddCorePlugin _ = badIO "addCorePlugin"
- qGetQ = badIO "getQ"
- qPutQ _ = badIO "putQ"
- qIsExtEnabled _ = badIO "isExtEnabled"
- qExtsEnabled = badIO "extsEnabled"
- qPutDoc _ _ = badIO "putDoc"
- qGetDoc _ = badIO "getDoc"
- qAddDependentDirectory _ = badIO "AddDependentDirectory"
+metaHandlersIO :: MetaHandlers
+metaHandlersIO = MetaHandlers {
+ mLiftIO = id
+ , mFail = fail
+ , mNewName = newNameIO
+ , mReport = \b msg ->
+ if b then
+ hPutStrLn stderr ("Template Haskell error: " ++ msg)
+ else
+ hPutStrLn stderr ("Template Haskell error: " ++ msg) -- TODO: should this be different from above?
+ , mLookupName = \ _ _ -> badIO "lookupName"
+ , mReify = \_ -> badIO "reify"
+ , mReifyFixity = \_ -> badIO "reifyFixity"
+ , mReifyType = \_ -> badIO "reifyFixity"
+ , mReifyInstances = \_ _ -> badIO "reifyInstances"
+ , mReifyRoles = \_ -> badIO "reifyRoles"
+ , mReifyAnnotations = \_ -> badIO "reifyAnnotations"
+ , mReifyModule = \_ -> badIO "reifyModule"
+ , mReifyConStrictness = \_ -> badIO "reifyConStrictness"
+ , mLocation = badIO "currentLocation"
+ , mRecover = \_ _ -> badIO "recover" -- Maybe we could fix this?
+ , mGetPackageRoot = badIO "getProjectRoot"
+ , mAddDependentFile = \_ -> badIO "addDependentFile"
+ , mAddTempFile = \_ -> badIO "addTempFile"
+ , mAddTopDecls = \_ -> badIO "addTopDecls"
+ , mAddForeignFilePath = \_ _ -> badIO "addForeignFilePath"
+ , mAddModFinalizer = \_ -> badIO "addModFinalizer"
+ , mAddCorePlugin = \_ -> badIO "addCorePlugin"
+ , mGetQ = badIO "getQ"
+ , mPutQ = \_ -> badIO "putQ"
+ , mIsExtEnabled = \_ -> badIO "isExtEnabled"
+ , mExtsEnabled = badIO "extsEnabled"
+ , mPutDoc = \_ _ -> badIO "putDoc"
+ , mGetDoc = \_ -> badIO "getDoc"
+ , mAddDependentDirectory = \_ -> badIO "AddDependentDirectory"
+ }
instance Quote IO where
newName = newNameIO
+
+
newNameIO :: String -> IO Name
newNameIO s = do { n <- atomicModifyIORef' counter (\x -> (x + 1, x))
; pure (mkNameU s n) }
-badIO :: String -> IO a
-badIO op = do { qReport True ("Can't do `" ++ op ++ "' in the IO monad")
- ; fail "Template Haskell failure" }
-
-- Global variable to generate unique symbols
counter :: IORef Uniq
{-# NOINLINE counter #-}
@@ -210,46 +215,24 @@ counter = unsafePerformIO (newIORef 0)
--
-----------------------------------------------------
--- | In short, 'Q' provides the 'Quasi' operations in one neat monad for the
--- user.
---
--- The longer story, is that 'Q' wraps an arbitrary 'Quasi'-able monad.
--- The perceptive reader notices that 'Quasi' has only two instances, 'Q'
--- itself and 'IO', neither of which have concrete implementations.'Q' plays
--- the trick of [dependency
--- inversion](https://en.wikipedia.org/wiki/Dependency_inversion_principle),
--- providing an abstract interface for the user which is later concretely
--- fufilled by an concrete 'Quasi' instance, internal to GHC.
-newtype Q a = Q { unQ :: forall m. Quasi m => m a }
-
--- | \"Runs\" the 'Q' monad. Normal users of Template Haskell
--- should not need this function, as the splice brackets @$( ... )@
--- are the usual way of running a 'Q' computation.
---
--- This function is primarily used in GHC internals, and for debugging
--- splices by running them in 'IO'.
---
--- Note that many functions in 'Q', such as 'reify' and other compiler
--- queries, are not supported when running 'Q' in 'IO'; these operations
--- simply fail at runtime. Indeed, the only operations guaranteed to succeed
--- are 'newName', 'runIO', 'reportError' and 'reportWarning'.
-runQ :: Quasi m => Q a -> m a
-runQ (Q m) = m
+-- | 'Q' is the base 'Monad' for TemplateHaskell splices,
+-- similar to how 'IO' is the base 'Monad' for normal Haskell programs.
+newtype Q a = Q { unQ :: MetaHandlers -> IO a }
instance Monad Q where
- Q m >>= k = Q (m >>= \x -> unQ (k x))
+ Q m >>= k = Q $ \h -> (m h >>= \x -> unQ (k x) h)
(>>) = (*>)
instance MonadFail Q where
- fail s = report True s >> Q (fail "Q monad failure")
+ fail s = report True s >> Q (\h -> mFail h "Q monad failure")
instance Functor Q where
- fmap f (Q x) = Q (fmap f x)
+ fmap f (Q x) = Q $ \h -> fmap f (x h)
instance Applicative Q where
- pure x = Q (pure x)
- Q f <*> Q x = Q (f <*> x)
- Q m *> Q n = Q (m *> n)
+ pure x = Q $ \_ -> pure x
+ Q f <*> Q x = Q $ \h -> (f h <*> x h)
+ Q m *> Q n = Q $ \h -> (m h *> n h)
-- | @since 2.17.0.0
instance Semigroup a => Semigroup (Q a) where
@@ -319,7 +302,7 @@ class Monad m => Quote m where
newName :: String -> m Name
instance Quote Q where
- newName s = Q (qNewName s)
+ newName s = Q $ \h -> mNewName h s
-----------------------------------------------------
--
@@ -517,35 +500,26 @@ joinCode = flip bindCode id
-- | Report an error (True) or warning (False),
-- but carry on; use 'fail' to stop.
report :: Bool -> String -> Q ()
-report b s = Q (qReport b s)
-{-# DEPRECATED report "Use reportError or reportWarning instead" #-} -- deprecated in 7.6
-
--- | Report an error to the user, but allow the current splice's computation to carry on. To abort the computation, use 'fail'.
-reportError :: String -> Q ()
-reportError = report True
-
--- | Report a warning to the user, and carry on.
-reportWarning :: String -> Q ()
-reportWarning = report False
+report b s = Q $ \h -> mReport h b s
-- | Recover from errors raised by 'reportError' or 'fail'.
recover :: Q a -- ^ handler to invoke on failure
-> Q a -- ^ computation to run
-> Q a
-recover (Q r) (Q m) = Q (qRecover r m)
+recover rec main = Q $ \h -> mRecover h rec main
-- We don't export lookupName; the Bool isn't a great API
-- Instead we export lookupTypeName, lookupValueName
lookupName :: Bool -> String -> Q (Maybe Name)
-lookupName ns s = Q (qLookupName ns s)
+lookupName ns s = Q $ \h -> mLookupName h ns s
-- | Look up the given name in the (type namespace of the) current splice's scope. See "Language.Haskell.TH.Syntax#namelookup" for more details.
lookupTypeName :: String -> Q (Maybe Name)
-lookupTypeName s = Q (qLookupName True s)
+lookupTypeName s = Q $ \h -> mLookupName h True s
-- | Look up the given name in the (value namespace of the) current splice's scope. See "Language.Haskell.TH.Syntax#namelookup" for more details.
lookupValueName :: String -> Q (Maybe Name)
-lookupValueName s = Q (qLookupName False s)
+lookupValueName s = Q $ \h -> mLookupName h False s
{-
Note [Name lookup]
@@ -620,7 +594,7 @@ To ensure we get information about @D@-the-value, use 'lookupValueName':
and to get information about @D@-the-type, use 'lookupTypeName'.
-}
reify :: Name -> Q Info
-reify v = Q (qReify v)
+reify v = Q $ \h -> mReify h v
{- | @reifyFixity nm@ attempts to find a fixity declaration for @nm@. For
example, if the function @foo@ has the fixity declaration @infixr 7 foo@, then
@@ -629,7 +603,7 @@ example, if the function @foo@ has the fixity declaration @infixr 7 foo@, then
'Nothing', so you may assume @bar@ has 'defaultFixity'.
-}
reifyFixity :: Name -> Q (Maybe Fixity)
-reifyFixity nm = Q (qReifyFixity nm)
+reifyFixity nm = Q $ \h -> mReifyFixity h nm
{- | @reifyType nm@ attempts to find the type or kind of @nm@. For example,
@reifyType 'not@ returns @Bool -> Bool@, and
@@ -637,7 +611,7 @@ reifyFixity nm = Q (qReifyFixity nm)
This works even if there's no explicit signature and the type or kind is inferred.
-}
reifyType :: Name -> Q Type
-reifyType nm = Q (qReifyType nm)
+reifyType nm = Q $ \h -> mReifyType h nm
{- | Template Haskell is capable of reifying information about types and
terms defined in previous declaration groups. Top-level declaration splices break up
@@ -729,7 +703,7 @@ has some discussion around this.
-}
reifyInstances :: Name -> [Type] -> Q [InstanceDec]
-reifyInstances cls tys = Q (qReifyInstances cls tys)
+reifyInstances cls tys = Q $ \h -> mReifyInstances h cls tys
{- | @reifyRoles nm@ returns the list of roles associated with the parameters
(both visible and invisible) of
@@ -748,20 +722,20 @@ and @reifyRoles Proxy@, we will get @['NominalR', 'PhantomR']@. The 'NominalR' i
the role of the invisible @k@ parameter. Kind parameters are always nominal.
-}
reifyRoles :: Name -> Q [Role]
-reifyRoles nm = Q (qReifyRoles nm)
+reifyRoles nm = Q $ \h -> mReifyRoles h nm
-- | @reifyAnnotations target@ returns the list of annotations
-- associated with @target@. Only the annotations that are
-- appropriately typed is returned. So if you have @Int@ and @String@
-- annotations for the same target, you have to call this function twice.
reifyAnnotations :: Data a => AnnLookup -> Q [a]
-reifyAnnotations an = Q (qReifyAnnotations an)
+reifyAnnotations an = Q $ \h -> mReifyAnnotations h an
-- | @reifyModule mod@ looks up information about module @mod@. To
-- look up the current module, call this function with the return
-- value of 'Language.Haskell.TH.Lib.thisModule'.
reifyModule :: Module -> Q ModuleInfo
-reifyModule m = Q (qReifyModule m)
+reifyModule m = Q $ \h -> mReifyModule h m
-- | @reifyConStrictness nm@ looks up the strictness information for the fields
-- of the constructor with the name @nm@. Note that the strictness information
@@ -776,7 +750,7 @@ reifyModule m = Q (qReifyModule m)
-- circumstances, but it would return @['DecidedStrict', DecidedStrict]@ if the
-- @-XStrictData@ language extension was enabled.
reifyConStrictness :: Name -> Q [DecidedStrictness]
-reifyConStrictness n = Q (qReifyConStrictness n)
+reifyConStrictness n = Q $ \h -> mReifyConStrictness h n
-- | Is the list of instances returned by 'reifyInstances' nonempty?
--
@@ -789,7 +763,7 @@ isInstance nm tys = do { decs <- reifyInstances nm tys
-- | The location at which this computation is spliced.
location :: Q Loc
-location = Q qLocation
+location = Q mLocation
-- |The 'runIO' function lets you run an I\/O computation in the 'Q' monad.
-- Take care: you are guaranteed the ordering of calls to 'runIO' within
@@ -799,7 +773,7 @@ location = Q qLocation
-- necessarily flushed when the compiler finishes running, so you should
-- flush them yourself.
runIO :: IO a -> Q a
-runIO m = Q (qRunIO m)
+runIO m = Q $ \h -> mLiftIO h m
-- | Get the package root for the current package which is being compiled.
-- This can be set explicitly with the -package-root flag but is normally
@@ -811,7 +785,7 @@ runIO m = Q (qRunIO m)
-- change directory when compiling files but instead set the -package-root flag
-- appropriately.
getPackageRoot :: Q FilePath
-getPackageRoot = Q qGetPackageRoot
+getPackageRoot = Q mGetPackageRoot
-- | Record external directories that runIO is using (dependent upon).
-- The compiler can then recognize that it should re-compile the Haskell file
@@ -830,7 +804,7 @@ getPackageRoot = Q qGetPackageRoot
-- * The state of the directory is read at the interface generation time,
-- not at the time of the function call.
addDependentDirectory :: FilePath -> Q ()
-addDependentDirectory dp = Q (qAddDependentDirectory dp)
+addDependentDirectory dp = Q $ \h -> mAddDependentDirectory h dp
-- | Record external files that runIO is using (dependent upon).
-- The compiler can then recognize that it should re-compile the Haskell file
@@ -844,17 +818,17 @@ addDependentDirectory dp = Q (qAddDependentDirectory dp)
--
-- * The dependency is based on file content, not a modification time
addDependentFile :: FilePath -> Q ()
-addDependentFile fp = Q (qAddDependentFile fp)
+addDependentFile fp = Q $ \h -> mAddDependentFile h fp
-- | Obtain a temporary file path with the given suffix. The compiler will
-- delete this file after compilation.
addTempFile :: String -> Q FilePath
-addTempFile suffix = Q (qAddTempFile suffix)
+addTempFile suffix = Q $ \h -> mAddTempFile h suffix
-- | Add additional top-level declarations. The added declarations will be type
-- checked along with the current declaration group.
addTopDecls :: [Dec] -> Q ()
-addTopDecls ds = Q (qAddTopDecls ds)
+addTopDecls ds = Q $ \h -> mAddTopDecls h ds
-- | Same as 'addForeignSource', but expects to receive a path pointing to the
-- foreign file instead of a 'String' of its contents. Consider using this in
@@ -863,7 +837,7 @@ addTopDecls ds = Q (qAddTopDecls ds)
-- This is a good alternative to 'addForeignSource' when you are trying to
-- directly link in an object file.
addForeignFilePath :: ForeignSrcLang -> FilePath -> Q ()
-addForeignFilePath lang fp = Q (qAddForeignFilePath lang fp)
+addForeignFilePath lang fp = Q $ \h -> mAddForeignFilePath h lang fp
-- | Add a finalizer that will run in the Q monad after the current module has
-- been type checked. This only makes sense when run within a top-level splice.
@@ -872,7 +846,7 @@ addForeignFilePath lang fp = Q (qAddForeignFilePath lang fp)
-- 'reify' is able to find the local definitions when executed inside the
-- finalizer.
addModFinalizer :: Q () -> Q ()
-addModFinalizer act = Q (qAddModFinalizer (unQ act))
+addModFinalizer act = Q $ \h -> mAddModFinalizer h act
-- | Adds a core plugin to the compilation pipeline.
--
@@ -882,7 +856,7 @@ addModFinalizer act = Q (qAddModFinalizer (unQ act))
-- to tell the compiler that we needed to compile first a plugin module in the
-- current package.
addCorePlugin :: String -> Q ()
-addCorePlugin plugin = Q (qAddCorePlugin plugin)
+addCorePlugin plugin = Q $ \h -> mAddCorePlugin h plugin
-- | Get state from the 'Q' monad. The state maintained by 'Q' is isomorphic to
-- a type-indexed finite map. That is,
@@ -896,20 +870,20 @@ addCorePlugin plugin = Q (qAddCorePlugin plugin)
-- Note that the state is local to the Haskell module in which the Template
-- Haskell expression is executed.
getQ :: Typeable a => Q (Maybe a)
-getQ = Q qGetQ
+getQ = Q mGetQ
-- | Replace the state in the 'Q' monad. Note that the state is local to the
-- Haskell module in which the Template Haskell expression is executed.
putQ :: Typeable a => a -> Q ()
-putQ x = Q (qPutQ x)
+putQ x = Q $ \h -> mPutQ h x
-- | Determine whether the given language extension is enabled in the 'Q' monad.
isExtEnabled :: Extension -> Q Bool
-isExtEnabled ext = Q (qIsExtEnabled ext)
+isExtEnabled ext = Q $ \h -> mIsExtEnabled h ext
-- | List all enabled language extensions.
extsEnabled :: Q [Extension]
-extsEnabled = Q qExtsEnabled
+extsEnabled = Q mExtsEnabled
-- | Add Haddock documentation to the specified location. This will overwrite
-- any documentation at the location if it already exists. This will reify the
@@ -928,48 +902,18 @@ extsEnabled = Q qExtsEnabled
-- Adding documentation to anything outside of the current module will cause an
-- error.
putDoc :: DocLoc -> String -> Q ()
-putDoc t s = Q (qPutDoc t s)
+putDoc t s = Q $ \h -> mPutDoc h t s
-- | Retrieves the Haddock documentation at the specified location, if one
-- exists.
-- It can be used to read documentation on things defined outside of the current
-- module, provided that those modules were compiled with the @-haddock@ flag.
getDoc :: DocLoc -> Q (Maybe String)
-getDoc n = Q (qGetDoc n)
+getDoc n = Q $ \h -> mGetDoc h n
instance MonadIO Q where
liftIO = runIO
-instance Quasi Q where
- qNewName = newName
- qReport = report
- qRecover = recover
- qReify = reify
- qReifyFixity = reifyFixity
- qReifyType = reifyType
- qReifyInstances = reifyInstances
- qReifyRoles = reifyRoles
- qReifyAnnotations = reifyAnnotations
- qReifyModule = reifyModule
- qReifyConStrictness = reifyConStrictness
- qLookupName = lookupName
- qLocation = location
- qGetPackageRoot = getPackageRoot
- qAddDependentFile = addDependentFile
- qAddDependentDirectory = addDependentDirectory
- qAddTempFile = addTempFile
- qAddTopDecls = addTopDecls
- qAddForeignFilePath = addForeignFilePath
- qAddModFinalizer = addModFinalizer
- qAddCorePlugin = addCorePlugin
- qGetQ = getQ
- qPutQ = putQ
- qIsExtEnabled = isExtEnabled
- qExtsEnabled = extsEnabled
- qPutDoc = putDoc
- qGetDoc = getDoc
-
-
----------------------------------------------------
-- The following operations are used solely in GHC.HsToCore.Quote when
-- desugaring brackets. They are not necessary for the user, who can use
=====================================
libraries/ghci/GHCi/TH.hs
=====================================
@@ -1,5 +1,5 @@
{-# LANGUAGE ScopedTypeVariables, StandaloneDeriving, DeriveGeneric,
- TupleSections, RecordWildCards, InstanceSigs, CPP #-}
+ TupleSections, RecordWildCards, InstanceSigs, CPP, RankNTypes #-}
{-# OPTIONS_GHC -fno-warn-name-shadowing #-}
-- |
@@ -164,58 +164,70 @@ ghcCmd m = GHCiQ $ \sRef -> do
instance MonadIO GHCiQ where
liftIO m = GHCiQ $ \_ -> m
-instance TH.Quasi GHCiQ where
- qNewName str = ghcCmd (NewName str)
- qReport isError msg = ghcCmd (Report isError msg)
-
- -- See Note [TH recover with -fexternal-interpreter] in GHC.Tc.Gen.Splice
- qRecover (GHCiQ h) a = GHCiQ $ \sRef -> mask $ \unmask -> do
- s <- readIORef sRef
- remoteTHCall (qsPipe s) StartRecover
- e <- try $ unmask $ runGHCiQ (a <* ghcCmd FailIfErrs) sRef
- remoteTHCall (qsPipe s) (EndRecover (isLeft e))
- case e of
- Left GHCiQException{} -> h sRef
- Right r -> return r
- qLookupName isType occ = ghcCmd (LookupName isType occ)
- qReify name = ghcCmd (Reify name)
- qReifyFixity name = ghcCmd (ReifyFixity name)
- qReifyType name = ghcCmd (ReifyType name)
- qReifyInstances name tys = ghcCmd (ReifyInstances name tys)
- qReifyRoles name = ghcCmd (ReifyRoles name)
-
-- To reify annotations, we send GHC the AnnLookup and also the
-- TypeRep of the thing we're looking for, to avoid needing to
-- serialize irrelevant annotations.
- qReifyAnnotations :: forall a . Data a => TH.AnnLookup -> GHCiQ [a]
- qReifyAnnotations lookup =
+reifyAnnotations :: forall a . Data a => TH.AnnLookup -> GHCiQ [a]
+reifyAnnotations lookup =
map (deserializeWithData . B.unpack) <$>
ghcCmd (ReifyAnnotations lookup typerep)
where typerep = typeOf (undefined :: a)
- qReifyModule m = ghcCmd (ReifyModule m)
- qReifyConStrictness name = ghcCmd (ReifyConStrictness name)
- qLocation = fromMaybe noLoc . qsLocation <$> getState
- qGetPackageRoot = ghcCmd GetPackageRoot
- qAddDependentFile file = ghcCmd (AddDependentFile file)
- qAddDependentDirectory dir = ghcCmd (AddDependentDirectory dir)
- qAddTempFile suffix = ghcCmd (AddTempFile suffix)
- qAddTopDecls decls = ghcCmd (AddTopDecls decls)
- qAddForeignFilePath lang fp = ghcCmd (AddForeignFilePath lang fp)
- qAddModFinalizer fin = GHCiQ (\_ -> mkRemoteRef fin) >>=
+runQinGHCiQ :: TH.Q a -> GHCiQ a
+runQinGHCiQ (TH.Q m) = GHCiQ $ \sRef -> m (metaHandlersGHCiQ (runInIO sRef))
+ where
+ runInIO :: IORef QState -> GHCiQ a -> IO a
+ runInIO sRef (GHCiQ m) = m sRef
+
+metaHandlersGHCiQ :: (forall x. GHCiQ x -> IO x) -> TH.MetaHandlers
+metaHandlersGHCiQ runInIO = TH.MetaHandlers {
+ mLiftIO = id
+ , mFail = runInIO . fail
+ , mNewName = \str -> runInIO $ ghcCmd (NewName str)
+ , mReport = \isError msg -> runInIO $ ghcCmd (Report isError msg)
+
+ -- See Note [TH recover with -fexternal-interpreter] in GHC.Tc.Gen.Splice
+ , mRecover = \h a -> runInIO $ GHCiQ $ \sRef -> mask $ \unmask -> do
+ s <- readIORef sRef
+ remoteTHCall (qsPipe s) StartRecover
+ e <- try $ unmask $ runGHCiQ (runQinGHCiQ a <* ghcCmd FailIfErrs) sRef
+ remoteTHCall (qsPipe s) (EndRecover (isLeft e))
+ case e of
+ Left GHCiQException{} ->
+ runGHCiQ (runQinGHCiQ h) sRef
+ Right r -> return r
+ , mLookupName = \isType occ -> runInIO $ ghcCmd (LookupName isType occ)
+ , mReify = \name ->runInIO $ ghcCmd (Reify name)
+ , mReifyFixity = \name ->runInIO $ ghcCmd (ReifyFixity name)
+ , mReifyType = \name -> runInIO $ ghcCmd (ReifyType name)
+ , mReifyInstances = \name tys -> runInIO $ ghcCmd (ReifyInstances name tys)
+ , mReifyRoles = \name -> runInIO $ ghcCmd (ReifyRoles name)
+
+ , mReifyAnnotations = runInIO . reifyAnnotations
+ , mReifyModule = \m -> runInIO $ ghcCmd (ReifyModule m)
+ , mReifyConStrictness = \name -> runInIO $ ghcCmd (ReifyConStrictness name)
+ , mLocation = runInIO $ fromMaybe noLoc . qsLocation <$> getState
+ , mGetPackageRoot = runInIO $ ghcCmd GetPackageRoot
+ , mAddDependentFile = \file -> runInIO $ ghcCmd (AddDependentFile file)
+ , mAddDependentDirectory = \dir -> runInIO $ ghcCmd (AddDependentDirectory dir)
+ , mAddTempFile = \suffix -> runInIO $ ghcCmd (AddTempFile suffix)
+ , mAddTopDecls = \decls -> runInIO $ ghcCmd (AddTopDecls decls)
+ , mAddForeignFilePath = \lang fp -> runInIO $ ghcCmd (AddForeignFilePath lang fp)
+ , mAddModFinalizer = \fin -> runInIO $ GHCiQ (\_ -> mkRemoteRef fin) >>=
ghcCmd . AddModFinalizer
- qAddCorePlugin str = ghcCmd (AddCorePlugin str)
- qGetQ = do
+ , mAddCorePlugin = \str -> runInIO $ ghcCmd (AddCorePlugin str)
+ , mGetQ = runInIO $ do
s <- getState
let lookup :: forall a. Typeable a => Map TypeRep Dynamic -> Maybe a
lookup m = fromDynamic =<< M.lookup (typeOf (undefined::a)) m
return $ lookup (qsMap s)
- qPutQ k = GHCiQ $ \sRef ->
- modifyIORef' sRef (\s -> s { qsMap = M.insert (typeOf k) (toDyn k) (qsMap s) })
- qIsExtEnabled x = ghcCmd (IsExtEnabled x)
- qExtsEnabled = ghcCmd ExtsEnabled
- qPutDoc l s = ghcCmd (PutDoc l s)
- qGetDoc l = ghcCmd (GetDoc l)
+ , mPutQ = \k -> runInIO $ GHCiQ $ \sRef ->
+ modifyIORef' sRef (\s -> s { qsMap = M.insert (typeOf k) (toDyn k) (qsMap s) })
+ , mIsExtEnabled = \x -> runInIO $ ghcCmd (IsExtEnabled x)
+ , mExtsEnabled = runInIO $ ghcCmd ExtsEnabled
+ , mPutDoc = \l s -> runInIO $ ghcCmd (PutDoc l s)
+ , mGetDoc = \l -> runInIO $ ghcCmd (GetDoc l)
+}
-- | The implementation of the 'StartTH' message: create
-- a new IORef QState, and return a RemoteRef to it.
@@ -235,7 +247,7 @@ runModFinalizerRefs pipe rstate qrefs = do
qstateref <- localRef rstate
qstate <- readIORef qstateref
qstate' <- newIORef $ qstate { qsPipe = pipe }
- _ <- runGHCiQ (TH.runQ $ sequence_ qs) qstate'
+ _ <- runGHCiQ (runQinGHCiQ $ sequence_ qs) qstate'
return ()
-- | The implementation of the 'RunTH' message
@@ -272,5 +284,5 @@ runTHQ
runTHQ pipe rstate mb_loc ghciq = do
qstateref <- localRef rstate
modifyIORef' qstateref (\qstate -> qstate { qsLocation = mb_loc, qsPipe = pipe })
- r <- runGHCiQ (TH.runQ ghciq) qstateref
+ r <- runGHCiQ (runQinGHCiQ ghciq) qstateref
return $! LB.toStrict (runPut (put r))
=====================================
libraries/template-haskell/Language/Haskell/TH/Syntax.hs
=====================================
@@ -5,13 +5,17 @@
{-# LANGUAGE TemplateHaskellQuotes #-}
{-# LANGUAGE Trustworthy #-}
{-# LANGUAGE UnboxedTuples #-}
+-- Don't warn for using 'report' from ghc-internal
+{-# OPTIONS_GHC -Wno-warnings-deprecations #-}
module Language.Haskell.TH.Syntax (
Quote (..),
Exp (..),
Match (..),
Clause (..),
- Q (..),
+ Q,
+ -- backwards compatibility
+ Language.Haskell.TH.Syntax.unQ,
Pat (..),
Stmt (..),
Con (..),
@@ -202,11 +206,14 @@ where
import GHC.Boot.TH.Lift
import GHC.Boot.TH.Syntax
-import GHC.Boot.TH.Monad
+import GHC.Boot.TH.Monad hiding (report)
+import qualified GHC.Boot.TH.Monad as Internal
import System.FilePath
import Data.Data hiding (Fixity(..))
import Data.List.NonEmpty (NonEmpty(..))
import GHC.Lexeme ( startsVarSym, startsVarId )
+import Control.Monad.IO.Class (MonadIO, liftIO)
+import System.IO (hPutStrLn, stderr)
-- This module completely re-exports 'GHC.Boot.TH.Syntax',
-- and exports additionally functions that depend on @filepath@ or @System.IO@.
@@ -499,3 +506,178 @@ reassociate the tree as necessary.
-- Subsumed by the more general 'SpecialiseEP' constructor.
pattern SpecialiseP :: Name -> Type -> (Maybe Inline) -> Phases -> Pragma
pattern SpecialiseP nm ty inl phases = SpecialiseEP Nothing [] (SigE (VarE nm) ty) inl phases
+
+unQ :: Q a -> (forall m. Quasi m => m a)
+unQ m = runQ m
+
+-----------------------------------------------------
+--
+-- The Quasi class
+--
+-----------------------------------------------------
+
+class (MonadIO m, MonadFail m) => Quasi m where
+ qRunQ :: Q a -> m a
+ -- | Fresh names. See 'newName'.
+ qNewName :: String -> m Name
+ qNewName = qRunQ . newName
+
+ ------- Error reporting and recovery -------
+ -- | Report an error (True) or warning (False)
+ -- ...but carry on; use 'fail' to stop. See 'report'.
+ qReport :: Bool -> String -> m ()
+ qReport b s = qRunQ $ report b s
+
+ -- | See 'recover'.
+ qRecover :: m a -- ^ the error handler
+ -> m a -- ^ action which may fail
+ -> m a -- ^ Recover from the monadic 'fail'
+
+ ------- Inspect the type-checker's environment -------
+ -- | True <=> type namespace, False <=> value namespace. See 'lookupName'.
+ qLookupName :: Bool -> String -> m (Maybe Name)
+ qLookupName ns s = qRunQ $ lookupName ns s
+ -- | See 'reify'.
+ qReify :: Name -> m Info
+ qReify v = qRunQ $ reify v
+ -- | See 'reifyFixity'.
+ qReifyFixity :: Name -> m (Maybe Fixity)
+ qReifyFixity v = qRunQ $ reifyFixity v
+ -- | See 'reifyType'.
+ qReifyType :: Name -> m Type
+ qReifyType v = qRunQ $ reifyType v
+ -- | Is (n tys) an instance? Returns list of matching instance Decs (with
+ -- empty sub-Decs) Works for classes and type functions. See 'reifyInstances'.
+ qReifyInstances :: Name -> [Type] -> m [Dec]
+ qReifyInstances cls tys = qRunQ $ reifyInstances cls tys
+ -- | See 'reifyRoles'.
+ qReifyRoles :: Name -> m [Role]
+ qReifyRoles nm = qRunQ $ reifyRoles nm
+ -- | See 'reifyAnnotations'.
+ qReifyAnnotations :: Data a => AnnLookup -> m [a]
+ qReifyAnnotations an = qRunQ $ reifyAnnotations an
+ -- | See 'reifyModule'.
+ qReifyModule :: Module -> m ModuleInfo
+ qReifyModule m = qRunQ $ reifyModule m
+ -- | See 'reifyConStrictness'.
+ qReifyConStrictness :: Name -> m [DecidedStrictness]
+ qReifyConStrictness nm = qRunQ $ qReifyConStrictness nm
+
+ -- | See 'location'.
+ qLocation :: m Loc
+ qLocation = qRunQ location
+
+ -- | Input/output (dangerous). See 'runIO'.
+ qRunIO :: IO a -> m a
+ qRunIO = liftIO
+ -- | See 'getPackageRoot'.
+ qGetPackageRoot :: m FilePath
+ qGetPackageRoot = qRunQ getPackageRoot
+
+ -- | See 'addDependentFile'.
+ qAddDependentFile :: FilePath -> m ()
+ qAddDependentFile p = qRunQ $ qAddDependentFile p
+
+ -- | See 'addDependentDirectory'.
+ qAddDependentDirectory :: FilePath -> m ()
+ qAddDependentDirectory p = qRunQ $ qAddDependentDirectory p
+
+ -- | See 'addTempFile'.
+ qAddTempFile :: String -> m FilePath
+ qAddTempFile p = qRunQ $ qAddTempFile p
+
+ -- | See 'addTopDecls'.
+ qAddTopDecls :: [Dec] -> m ()
+ qAddTopDecls decls = qRunQ $ qAddTopDecls decls
+
+ -- | See 'addForeignFilePath'.
+ qAddForeignFilePath :: ForeignSrcLang -> String -> m ()
+ qAddForeignFilePath lang fp = qRunQ $ addForeignFilePath lang fp
+
+ -- | See 'addModFinalizer'.
+ qAddModFinalizer :: Q () -> m ()
+ qAddModFinalizer fin = qRunQ $ addModFinalizer fin
+
+ -- | See 'addCorePlugin'.
+ qAddCorePlugin :: String -> m ()
+ qAddCorePlugin nm = qRunQ $ addCorePlugin nm
+
+ -- | See 'getQ'.
+ qGetQ :: Typeable a => m (Maybe a)
+ qGetQ = qRunQ getQ
+
+ -- | See 'putQ'.
+ qPutQ :: Typeable a => a -> m ()
+ qPutQ x = qRunQ $ putQ x
+
+ -- | See 'isExtEnabled'.
+ qIsExtEnabled :: Extension -> m Bool
+ qIsExtEnabled ext = qRunQ $ isExtEnabled ext
+ -- | See 'extsEnabled'.
+ qExtsEnabled :: m [Extension]
+ qExtsEnabled = qRunQ extsEnabled
+
+ -- | See 'putDoc'.
+ qPutDoc :: DocLoc -> String -> m ()
+ qPutDoc l s = qRunQ $ putDoc l s
+ -- | See 'getDoc'.
+ qGetDoc :: DocLoc -> m (Maybe String)
+ qGetDoc l = qRunQ $ getDoc l
+ {-# MINIMAL qRunQ, qRecover
+ | qRunQ, qNewName, qReport, qRecover, qLookupName, qReify, qReifyFixity,
+ qReifyType, qReifyInstances, qReifyRoles, qReifyAnnotations,
+ qReifyModule, qReifyConStrictness, qLocation, qGetPackageRoot,
+ qAddDependentFile, qAddDependentDirectory, qAddTempFile, qAddTopDecls,
+ qAddForeignFilePath, qAddModFinalizer, qAddCorePlugin, qGetQ, qPutQ,
+ qIsExtEnabled, qExtsEnabled, qPutDoc, qGetDoc
+ #-}
+
+-- | \"Runs\" the 'Q' monad. Normal users of Template Haskell
+-- should not need this function, as the splice brackets @$( ... )@
+-- are the usual way of running a 'Q' computation.
+--
+-- This function is primarily used in GHC internals, and for debugging
+-- splices by running them in 'IO'.
+--
+-- Note that many functions in 'Q', such as 'reify' and other compiler
+-- queries, are not supported when running 'Q' in 'IO'; these operations
+-- simply fail at runtime. Indeed, the only operations guaranteed to succeed
+-- are 'newName', 'runIO', 'reportError' and 'reportWarning'.
+runQ :: Quasi m => Q a -> m a
+runQ = qRunQ
+
+-----------------------------------------------------
+-- The IO instance of Quasi
+-----------------------------------------------------
+
+-- | This instance is used only when running a Q
+-- computation in the IO monad, usually just to
+-- print the result. There is no interesting
+-- type environment, so reification isn't going to
+-- work.
+instance Quasi IO where
+ qRunQ (Q m) = m metaHandlersIO
+ qNewName = newNameIO
+
+ qReport True msg = hPutStrLn stderr ("Template Haskell error: " ++ msg)
+ qReport False msg = hPutStrLn stderr ("Template Haskell error: " ++ msg)
+ qRecover _ _ = badIO "recover" -- Maybe we could fix this?
+
+instance Quasi Q where
+ qRunQ = id
+ qRecover = recover
+
+
+-- | Report an error (True) or warning (False),
+-- but carry on; use 'fail' to stop.
+report :: Bool -> String -> Q ()
+report = Internal.report
+{-# DEPRECATED report "Use reportError or reportWarning instead" #-} -- deprecated in 7.6
+
+-- | Report an error to the user, but allow the current splice's computation to carry on. To abort the computation, use 'fail'.
+reportError :: String -> Q ()
+reportError = report True
+
+-- | Report a warning to the user, and carry on.
+reportWarning :: String -> Q ()
+reportWarning = report False
=====================================
testsuite/tests/interface-stability/template-haskell-exports.stdout
=====================================
@@ -354,7 +354,6 @@ module Language.Haskell.TH where
type Pred = Type
type PredQ :: *
type PredQ = Q Pred
- type role Q nominal
type Q :: * -> *
newtype Q a = ...
type Quote :: (* -> *) -> Constraint
@@ -655,7 +654,7 @@ module Language.Haskell.TH where
roleAnnotD :: forall (m :: * -> *). Quote m => Name -> [GHC.Internal.TH.Lib.Role] -> m Dec
ruleVar :: forall (m :: * -> *). Quote m => Name -> m RuleBndr
runIO :: forall a. GHC.Internal.Types.IO a -> Q a
- runQ :: forall (m :: * -> *) a. GHC.Internal.TH.Monad.Quasi m => Q a -> m a
+ runQ :: forall (m :: * -> *) a. Language.Haskell.TH.Syntax.Quasi m => Q a -> m a
safe :: Safety
sectionL :: forall (m :: * -> *). Quote m => m Exp -> m Exp -> m Exp
sectionR :: forall (m :: * -> *). Quote m => m Exp -> m Exp -> m Exp
@@ -1703,11 +1702,11 @@ module Language.Haskell.TH.Syntax where
data Pragma = InlineP Name Inline RuleMatch Phases | OpaqueP Name | SpecialiseEP (GHC.Internal.Maybe.Maybe [TyVarBndr ()]) [RuleBndr] Exp (GHC.Internal.Maybe.Maybe Inline) Phases | SpecialiseInstP Type | RuleP GHC.Internal.Base.String (GHC.Internal.Maybe.Maybe [TyVarBndr ()]) [RuleBndr] Exp Exp Phases | AnnP AnnTarget Exp | LineP GHC.Internal.Types.Int GHC.Internal.Base.String | CompleteP [Name] (GHC.Internal.Maybe.Maybe Name) | SCCP Name (GHC.Internal.Maybe.Maybe GHC.Internal.Base.String)
type Pred :: *
type Pred = Type
- type role Q nominal
type Q :: * -> *
- newtype Q a = Q {unQ :: forall (m :: * -> *). Quasi m => m a}
+ newtype Q a = ...
type Quasi :: (* -> *) -> Constraint
class (GHC.Internal.Control.Monad.IO.Class.MonadIO m, GHC.Internal.Control.Monad.Fail.MonadFail m) => Quasi m where
+ qRunQ :: forall a. Q a -> m a
qNewName :: GHC.Internal.Base.String -> m Name
qReport :: GHC.Internal.Types.Bool -> GHC.Internal.Base.String -> m ()
qRecover :: forall a. m a -> m a -> m a
@@ -1730,13 +1729,13 @@ module Language.Haskell.TH.Syntax where
qAddForeignFilePath :: ForeignSrcLang -> GHC.Internal.Base.String -> m ()
qAddModFinalizer :: Q () -> m ()
qAddCorePlugin :: GHC.Internal.Base.String -> m ()
- qGetQ :: forall a. ghc-internal-9.1500.0:GHC.Internal.Data.Typeable.Internal.Typeable a => m (GHC.Internal.Maybe.Maybe a)
- qPutQ :: forall a. ghc-internal-9.1500.0:GHC.Internal.Data.Typeable.Internal.Typeable a => a -> m ()
+ qGetQ :: forall a. ghc-internal-10.100.0:GHC.Internal.Data.Typeable.Internal.Typeable a => m (GHC.Internal.Maybe.Maybe a)
+ qPutQ :: forall a. ghc-internal-10.100.0:GHC.Internal.Data.Typeable.Internal.Typeable a => a -> m ()
qIsExtEnabled :: Extension -> m GHC.Internal.Types.Bool
qExtsEnabled :: m [Extension]
qPutDoc :: DocLoc -> GHC.Internal.Base.String -> m ()
qGetDoc :: DocLoc -> m (GHC.Internal.Maybe.Maybe GHC.Internal.Base.String)
- {-# MINIMAL qNewName, qReport, qRecover, qLookupName, qReify, qReifyFixity, qReifyType, qReifyInstances, qReifyRoles, qReifyAnnotations, qReifyModule, qReifyConStrictness, qLocation, qGetPackageRoot, qAddDependentFile, qAddDependentDirectory, qAddTempFile, qAddTopDecls, qAddForeignFilePath, qAddModFinalizer, qAddCorePlugin, qGetQ, qPutQ, qIsExtEnabled, qExtsEnabled, qPutDoc, qGetDoc #-}
+ {-# MINIMAL qRunQ, qNewName, qReport, qRecover, qLookupName, qReify, qReifyFixity, qReifyType, qReifyInstances, qReifyRoles, qReifyAnnotations, qReifyModule, qReifyConStrictness, qLocation, qGetPackageRoot, qAddDependentFile, qAddDependentDirectory, qAddTempFile, qAddTopDecls, qAddForeignFilePath, qAddModFinalizer, qAddCorePlugin, qGetQ, qPutQ, qIsExtEnabled, qExtsEnabled, qPutDoc, qGetDoc #-}
type Quote :: (* -> *) -> Constraint
class GHC.Internal.Base.Monad m => Quote m where
newName :: GHC.Internal.Base.String -> m Name
@@ -1814,7 +1813,7 @@ module Language.Haskell.TH.Syntax where
falseName :: Name
getDoc :: DocLoc -> Q (GHC.Internal.Maybe.Maybe GHC.Internal.Base.String)
getPackageRoot :: Q GHC.Internal.IO.FilePath
- getQ :: forall a. ghc-internal-9.1500.0:GHC.Internal.Data.Typeable.Internal.Typeable a => Q (GHC.Internal.Maybe.Maybe a)
+ getQ :: forall a. ghc-internal-10.100.0:GHC.Internal.Data.Typeable.Internal.Typeable a => Q (GHC.Internal.Maybe.Maybe a)
get_cons_names :: Con -> [Name]
hoistCode :: forall (m :: * -> *) (n :: * -> *) (r :: GHC.Internal.Types.RuntimeRep) (a :: TYPE r). GHC.Internal.Base.Monad m => (forall x. m x -> n x) -> Code m a -> Code n a
isExtEnabled :: Extension -> Q GHC.Internal.Types.Bool
@@ -1861,7 +1860,7 @@ module Language.Haskell.TH.Syntax where
oneName :: Name
pkgString :: PkgName -> GHC.Internal.Base.String
putDoc :: DocLoc -> GHC.Internal.Base.String -> Q ()
- putQ :: forall a. ghc-internal-9.1500.0:GHC.Internal.Data.Typeable.Internal.Typeable a => a -> Q ()
+ putQ :: forall a. ghc-internal-10.100.0:GHC.Internal.Data.Typeable.Internal.Typeable a => a -> Q ()
recover :: forall a. Q a -> Q a -> Q a
reify :: Name -> Q Info
reifyAnnotations :: forall a. GHC.Internal.Data.Data.Data a => AnnLookup -> Q [a]
@@ -1884,6 +1883,7 @@ module Language.Haskell.TH.Syntax where
trueName :: Name
tupleDataName :: GHC.Internal.Types.Int -> Name
tupleTypeName :: GHC.Internal.Types.Int -> Name
+ unQ :: forall a. Q a -> forall (m :: * -> *). Quasi m => m a
unTypeCode :: forall (r :: GHC.Internal.Types.RuntimeRep) (a :: TYPE r) (m :: * -> *). Quote m => Code m a -> m Exp
unTypeQ :: forall (r :: GHC.Internal.Types.RuntimeRep) (a :: TYPE r) (m :: * -> *). Quote m => m (TExp a) -> m Exp
unboxedSumDataName :: SumAlt -> SumArity -> Name
@@ -2289,10 +2289,10 @@ instance forall a b c d e f g. (GHC.Internal.TH.Lift.Lift a, GHC.Internal.TH.Lif
instance GHC.Internal.TH.Lift.Lift (# #) -- Defined in ‘GHC.Internal.TH.Lift’
instance GHC.Internal.TH.Lift.Lift GHC.Internal.Prim.Char# -- Defined in ‘GHC.Internal.TH.Lift’
instance GHC.Internal.TH.Lift.Lift GHC.Internal.Prim.Word# -- Defined in ‘GHC.Internal.TH.Lift’
-instance GHC.Internal.TH.Monad.Quasi GHC.Internal.Types.IO -- Defined in ‘GHC.Internal.TH.Monad’
-instance GHC.Internal.TH.Monad.Quasi GHC.Internal.TH.Monad.Q -- Defined in ‘GHC.Internal.TH.Monad’
instance GHC.Internal.TH.Monad.Quote GHC.Internal.Types.IO -- Defined in ‘GHC.Internal.TH.Monad’
instance GHC.Internal.TH.Monad.Quote GHC.Internal.TH.Monad.Q -- Defined in ‘GHC.Internal.TH.Monad’
instance [safe] Language.Haskell.TH.Lib.DefaultBndrFlag GHC.Internal.TH.Syntax.BndrVis -- Defined in ‘Language.Haskell.TH.Lib’
instance [safe] Language.Haskell.TH.Lib.DefaultBndrFlag GHC.Internal.TH.Syntax.Specificity -- Defined in ‘Language.Haskell.TH.Lib’
instance [safe] Language.Haskell.TH.Lib.DefaultBndrFlag () -- Defined in ‘Language.Haskell.TH.Lib’
+instance Language.Haskell.TH.Syntax.Quasi GHC.Internal.Types.IO -- Defined in ‘Language.Haskell.TH.Syntax’
+instance Language.Haskell.TH.Syntax.Quasi GHC.Internal.TH.Monad.Q -- Defined in ‘Language.Haskell.TH.Syntax’
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/d9eda5131daeb8186ad1757b7b405c8…
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[Git][ghc/ghc][wip/romes/27401-2] perf: Share Module in Iface Symbol Table
by Rodrigo Mesquita (＠alt-romes) 18 Jun '26
by Rodrigo Mesquita (＠alt-romes) 18 Jun '26
18 Jun '26
Rodrigo Mesquita pushed to branch wip/romes/27401-2 at Glasgow Haskell Compiler / GHC
Commits:
c3b3affb by Rodrigo Mesquita at 2026-06-18T17:15:18+01:00
perf: Share Module in Iface Symbol Table
This commit modifies the structure of the serialized `SymbolTable Name`
to then re-use and share the `Module` (both on disk and in memory) across
all `Name`s from the same module.
The new structure looks like:
<total name count>
$modules.size
for (mod, names) in $modules:
$mod
$names.size
for table_ix, occ in $names
$table_ix
$occ
i.e. we put the module just once, followed by all names in that module.
When deserializing, we deserialize the module just once, and all the
following `Name`s are constructed with a pointer to that same decoded
`Module`.
Fixes #27401
- - - - -
1 changed file:
- utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
Changes:
=====================================
utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
=====================================
@@ -50,7 +50,9 @@ import GHC.Iface.Type (IfaceType, putIfaceType)
import GHC.Types.Name.Cache
import GHC.Types.Unique
import GHC.Types.Unique.FM
+import GHC.Types.Name.Env
import GHC.Unit.State
+import GHC.Unit.Module.Env
import GHC.Utils.Binary
import Haddock.Types
import Text.ParserCombinators.ReadP (readP_to_S)
@@ -139,7 +141,7 @@ binaryInterfaceMagic = 0xD0Cface
--
binaryInterfaceVersion :: Word16
#if MIN_VERSION_ghc(9,11,0) && !MIN_VERSION_ghc(10,2,0)
-binaryInterfaceVersion = 46
+binaryInterfaceVersion = 47
binaryInterfaceVersionCompatibility :: [Word16]
binaryInterfaceVersionCompatibility = [binaryInterfaceVersion]
@@ -170,7 +172,7 @@ writeInterfaceFile filename iface = do
-- Make some intial state
symtab_next <- newFastMutInt 0
- symtab_map <- newIORef emptyUFM
+ symtab_map <- newIORef emptyModuleEnv
let bin_symtab =
BinSymbolTable
{ bin_symtab_next = symtab_next
@@ -269,18 +271,31 @@ putName
name =
do
symtab_map <- readIORef symtab_map_ref
- case lookupUFM symtab_map name of
- Just (off, _) -> put_ bh (fromIntegral off :: Word32)
+ let mod' = nameModule name
+ case lookupModuleEnv symtab_map mod' of
+ Just nm_env ->
+ case lookupDNameEnv nm_env name of
+ Just (off, _) -> put_ bh (fromIntegral off :: Word32)
+ Nothing -> do
+ off <- freshIndex
+ writeIORef symtab_map_ref $!
+ extendModuleEnv symtab_map mod' (extendDNameEnv nm_env name (off, name))
+ put_ bh (fromIntegral off :: Word32)
Nothing -> do
- off <- readFastMutInt symtab_next
- writeFastMutInt symtab_next (off + 1)
+ off <- freshIndex
writeIORef symtab_map_ref $!
- addToUFM symtab_map name (off, name)
+ extendModuleEnv symtab_map mod' (extendDNameEnv emptyDNameEnv name (off, name))
put_ bh (fromIntegral off :: Word32)
+ where
+ freshIndex :: IO Int
+ freshIndex = do
+ off <- readFastMutInt symtab_next
+ writeFastMutInt symtab_next (off + 1)
+ return off
data BinSymbolTable = BinSymbolTable
{ bin_symtab_next :: !FastMutInt -- The next index to use
- , bin_symtab_map :: !(IORef (UniqFM Name (Int, Name)))
+ , bin_symtab_map :: !(IORef (ModuleEnv (DNameEnv (Int, Name))))
-- indexed by Name
}
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c3b3affb0427149846a0e979e1d7511…
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c3b3affb0427149846a0e979e1d7511…
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[Git][ghc/ghc][wip/romes/27401-2] perf: Share Module in Iface Symbol Table
by Rodrigo Mesquita (＠alt-romes) 18 Jun '26
by Rodrigo Mesquita (＠alt-romes) 18 Jun '26
18 Jun '26
Rodrigo Mesquita pushed to branch wip/romes/27401-2 at Glasgow Haskell Compiler / GHC
Commits:
3617315e by Rodrigo Mesquita at 2026-06-18T17:14:09+01:00
perf: Share Module in Iface Symbol Table
This commit modifies the structure of the serialized `SymbolTable Name`
to then re-use and share the `Module` (both on disk and in memory) across
all `Name`s from the same module.
The new structure looks like:
<total name count>
$modules.size
for (mod, names) in $modules:
$mod
$names.size
for table_ix, occ in $names
$table_ix
$occ
i.e. we put the module just once, followed by all names in that module.
When deserializing, we deserialize the module just once, and all the
following `Name`s are constructed with a pointer to that same decoded
`Module`.
Fixes #27401
- - - - -
1 changed file:
- utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
Changes:
=====================================
utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
=====================================
@@ -50,7 +50,9 @@ import GHC.Iface.Type (IfaceType, putIfaceType)
import GHC.Types.Name.Cache
import GHC.Types.Unique
import GHC.Types.Unique.FM
+import GHC.Types.Name.Env
import GHC.Unit.State
+import GHC.Unit.Module.Env
import GHC.Utils.Binary
import Haddock.Types
import Text.ParserCombinators.ReadP (readP_to_S)
@@ -139,7 +141,7 @@ binaryInterfaceMagic = 0xD0Cface
--
binaryInterfaceVersion :: Word16
#if MIN_VERSION_ghc(9,11,0) && !MIN_VERSION_ghc(10,2,0)
-binaryInterfaceVersion = 46
+binaryInterfaceVersion = 47
binaryInterfaceVersionCompatibility :: [Word16]
binaryInterfaceVersionCompatibility = [binaryInterfaceVersion]
@@ -170,7 +172,7 @@ writeInterfaceFile filename iface = do
-- Make some intial state
symtab_next <- newFastMutInt 0
- symtab_map <- newIORef emptyUFM
+ symtab_map <- newIORef emptyModuleEnv
let bin_symtab =
BinSymbolTable
{ bin_symtab_next = symtab_next
@@ -269,18 +271,31 @@ putName
name =
do
symtab_map <- readIORef symtab_map_ref
- case lookupUFM symtab_map name of
- Just (off, _) -> put_ bh (fromIntegral off :: Word32)
+ let mod' = nameModule name
+ case lookupModuleEnv symtab_map mod' of
+ Just nm_env ->
+ case lookupDNameEnv nm_env name of
+ Just (off, _) -> put_ bh (fromIntegral off :: Word32)
+ Nothing -> do
+ off <- freshIndex
+ writeIORef symtab_map_ref $!
+ extendModuleEnv symtab_map mod' (extendDNameEnv nm_env name (off, name))
+ put_ bh (fromIntegral off :: Word32)
Nothing -> do
- off <- readFastMutInt symtab_next
- writeFastMutInt symtab_next (off + 1)
+ off <- freshIndex
writeIORef symtab_map_ref $!
- addToUFM symtab_map name (off, name)
+ extendModuleEnv symtab_map mod' (extendDNameEnv emptyDNameEnv name (off, name))
put_ bh (fromIntegral off :: Word32)
+ where
+ freshIndex :: IO Int
+ freshIndex = do
+ off <- readFastMutInt symtab_next
+ writeFastMutInt symtab_next (off + 1)
+ return off
data BinSymbolTable = BinSymbolTable
{ bin_symtab_next :: !FastMutInt -- The next index to use
- , bin_symtab_map :: !(IORef (UniqFM Name (Int, Name)))
+ , bin_symtab_map :: !(IORef (ModuleEnv (DNameEnv (Int, Name))))
-- indexed by Name
}
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/3617315eb33127a6fdcc8c21021e92e…
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18 Jun '26
Rodrigo Mesquita pushed new branch wip/romes/27401-2 at Glasgow Haskell Compiler / GHC
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/romes/27401-2
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