17 Jun '25
Rodrigo Mesquita pushed new branch wip/romes/24098 at Glasgow Haskell Compiler / GHC
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/romes/24098
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[Git][ghc/ghc][wip/T26118-remove-hptallfaminstances-usage-during-upsweep] Remove hptAllFamInstances usage during upsweep
by Patrick (＠soulomoon) 17 Jun '25
by Patrick (＠soulomoon) 17 Jun '25
17 Jun '25
Patrick pushed to branch wip/T26118-remove-hptallfaminstances-usage-during-upsweep at Glasgow Haskell Compiler / GHC
Commits:
bbbbc7ef by soulomoon at 2025-06-17T18:25:05+08:00
Remove hptAllFamInstances usage during upsweep
Fixes #26118
This change eliminates the use of hptAllFamInstances during the upsweep phase,
as it could access non-below modules from the home package table.
The following updates were made:
* Updated checkFamInstConsistency to accept an explicit ModuleEnv FamInstEnv
parameter and removed the call to hptAllFamInstances.
* Adjusted hugInstancesBelow so we can construct ModuleEnv FamInstEnv
from its result,
* hptAllFamInstances and allFamInstances functions are removed.
- - - - -
5 changed files:
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Unit/Home/Graph.hs
- compiler/GHC/Unit/Home/PackageTable.hs
Changes:
=====================================
compiler/GHC/Driver/Env.hs
=====================================
@@ -237,7 +237,7 @@ hugCompleteSigsBelow hsc uid mn = foldr (++) [] <$>
hugSomeThingsBelowUs (md_complete_matches . hm_details) False hsc uid mn
-- | Find instances visible from the given set of imports
-hugInstancesBelow :: HscEnv -> UnitId -> ModuleNameWithIsBoot -> IO (InstEnv, [FamInst])
+hugInstancesBelow :: HscEnv -> UnitId -> ModuleNameWithIsBoot -> IO (InstEnv, [(Module, FamInstEnv)])
hugInstancesBelow hsc_env uid mnwib = do
let mn = gwib_mod mnwib
(insts, famInsts) <-
@@ -247,7 +247,7 @@ hugInstancesBelow hsc_env uid mnwib = do
-- Don't include instances for the current module
in if moduleName (mi_module (hm_iface mod_info)) == mn
then []
- else [(md_insts details, md_fam_insts details)])
+ else [(md_insts details, [(mi_module $ hm_iface mod_info, extendFamInstEnvList emptyFamInstEnv $ md_fam_insts details)])])
True -- Include -hi-boot
hsc_env
uid
=====================================
compiler/GHC/Tc/Instance/Family.hs
=====================================
@@ -286,8 +286,8 @@ why we still do redundant checks.
-- We don't need to check the current module, this is done in
-- tcExtendLocalFamInstEnv.
-- See Note [The type family instance consistency story].
-checkFamInstConsistency :: [Module] -> TcM ()
-checkFamInstConsistency directlyImpMods
+checkFamInstConsistency :: ModuleEnv FamInstEnv -> [Module] -> TcM ()
+checkFamInstConsistency hpt_fam_insts directlyImpMods
= do { (eps, hug) <- getEpsAndHug
; traceTc "checkFamInstConsistency" (ppr directlyImpMods)
; let { -- Fetch the iface of a given module. Must succeed as
@@ -317,7 +317,6 @@ checkFamInstConsistency directlyImpMods
-- See Note [Order of type family consistency checks]
}
- ; hpt_fam_insts <- liftIO $ HUG.allFamInstances hug
; debug_consistent_set <- mapM (\x -> (\y -> (x, length y)) <$> modConsistent x) directlyImpMods
; traceTc "init_consistent_set" (ppr debug_consistent_set)
; let init_consistent_set = map fst (reverse (sortOn snd debug_consistent_set))
=====================================
compiler/GHC/Tc/Module.hs
=====================================
@@ -120,7 +120,7 @@ import GHC.Core.TyCo.Ppr( debugPprType )
import GHC.Core.TyCo.Tidy( tidyTopType )
import GHC.Core.FamInstEnv
( FamInst, pprFamInst, famInstsRepTyCons, orphNamesOfFamInst
- , famInstEnvElts, extendFamInstEnvList, normaliseType )
+ , famInstEnvElts, extendFamInstEnvList, normaliseType, emptyFamInstEnv, unionFamInstEnv )
import GHC.Parser.Header ( mkPrelImports )
@@ -467,8 +467,8 @@ tcRnImports hsc_env import_decls
= do { (rn_imports, imp_user_spec, rdr_env, imports) <- rnImports import_decls
-- Get the default declarations for the classes imported by this module
-- and group them by class.
- ; tc_defaults <-(NE.groupBy ((==) `on` cd_class) . (concatMap defaultList))
- <$> tcGetClsDefaults (M.keys $ imp_mods imports)
+ ; tc_defaults <- NE.groupBy ((==) `on` cd_class) . (concatMap defaultList)
+ <$> tcGetClsDefaults (M.keys $ imp_mods imports)
; this_mod <- getModule
; gbl_env <- getGblEnv
; let unitId = homeUnitId $ hsc_home_unit hsc_env
@@ -480,8 +480,10 @@ tcRnImports hsc_env import_decls
-- filtering also ensures that we don't see instances from
-- modules batch (@--make@) compiled before this one, but
-- which are not below this one.
- ; (home_insts, home_fam_insts) <- liftIO $
+ ; (home_insts, home_mod_fam_inst_env) <- liftIO $
hugInstancesBelow hsc_env unitId mnwib
+ ; let home_fam_inst_env = foldl' unionFamInstEnv emptyFamInstEnv $ snd <$> home_mod_fam_inst_env
+ ; let hpt_fam_insts = mkModuleEnv home_mod_fam_inst_env
-- We use 'unsafeInterleaveIO' to avoid redundant memory allocations
-- See Note [Lazily loading COMPLETE pragmas] from GHC.HsToCore.Monad
@@ -507,8 +509,7 @@ tcRnImports hsc_env import_decls
tcg_rn_imports = rn_imports,
tcg_default = foldMap subsume tc_defaults,
tcg_inst_env = tcg_inst_env gbl `unionInstEnv` home_insts,
- tcg_fam_inst_env = extendFamInstEnvList (tcg_fam_inst_env gbl)
- home_fam_insts
+ tcg_fam_inst_env = unionFamInstEnv (tcg_fam_inst_env gbl) home_fam_inst_env
}) $ do {
; traceRn "rn1" (ppr (imp_direct_dep_mods imports))
@@ -538,7 +539,7 @@ tcRnImports hsc_env import_decls
$ imports }
; logger <- getLogger
; withTiming logger (text "ConsistencyCheck"<+>brackets (ppr this_mod)) (const ())
- $ checkFamInstConsistency dir_imp_mods
+ $ checkFamInstConsistency hpt_fam_insts dir_imp_mods
; traceRn "rn1: } checking family instance consistency" empty
; gbl_env <- getGblEnv
=====================================
compiler/GHC/Unit/Home/Graph.hs
=====================================
@@ -43,7 +43,6 @@ module GHC.Unit.Home.Graph
-- * Very important queries
, allInstances
- , allFamInstances
, allAnns
, allCompleteSigs
@@ -110,10 +109,6 @@ allInstances hug = foldr go (pure (emptyInstEnv, [])) hug where
go hue = liftA2 (\(a,b) (a',b') -> (a `unionInstEnv` a', b ++ b'))
(hptAllInstances (homeUnitEnv_hpt hue))
-allFamInstances :: HomeUnitGraph -> IO (ModuleEnv FamInstEnv)
-allFamInstances hug = foldr go (pure emptyModuleEnv) hug where
- go hue = liftA2 plusModuleEnv (hptAllFamInstances (homeUnitEnv_hpt hue))
-
allAnns :: HomeUnitGraph -> IO AnnEnv
allAnns hug = foldr go (pure emptyAnnEnv) hug where
go hue = liftA2 plusAnnEnv (hptAllAnnotations (homeUnitEnv_hpt hue))
=====================================
compiler/GHC/Unit/Home/PackageTable.hs
=====================================
@@ -41,7 +41,6 @@ module GHC.Unit.Home.PackageTable
-- * Queries about home modules
, hptCompleteSigs
, hptAllInstances
- , hptAllFamInstances
, hptAllAnnotations
-- ** More Traversal-based queries
@@ -208,14 +207,6 @@ hptAllInstances hpt = do
let (insts, famInsts) = unzip hits
return (foldl' unionInstEnv emptyInstEnv insts, concat famInsts)
--- | Find all the family instance declarations from the HPT
-hptAllFamInstances :: HomePackageTable -> IO (ModuleEnv FamInstEnv)
-hptAllFamInstances = fmap mkModuleEnv . concatHpt (\hmi -> [(hmiModule hmi, hmiFamInstEnv hmi)])
- where
- hmiModule = mi_module . hm_iface
- hmiFamInstEnv = extendFamInstEnvList emptyFamInstEnv
- . md_fam_insts . hm_details
-
-- | All annotations from the HPT
hptAllAnnotations :: HomePackageTable -> IO AnnEnv
hptAllAnnotations = fmap mkAnnEnv . concatHpt (md_anns . hm_details)
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/bbbbc7ef2731b50fb5f1442ba4acfa2…
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[Git][ghc/ghc][wip/T23675] hadrian: Use settings-use-distro-mingw directly
by Rodrigo Mesquita (＠alt-romes) 17 Jun '25
by Rodrigo Mesquita (＠alt-romes) 17 Jun '25
17 Jun '25
Rodrigo Mesquita pushed to branch wip/T23675 at Glasgow Haskell Compiler / GHC
Commits:
51837035 by Rodrigo Mesquita at 2025-06-17T11:26:31+01:00
hadrian: Use settings-use-distro-mingw directly
The type `ToolchainSetting` only made sense when we had more settings to
fetch from the system config file. Even then "settings-use-distro-mingw"
is arguably not a toolchain setting.
With the fix for #23675, all toolchain tools were moved to the
`ghc-toolchain` `Toolchain` format. Therefore, we can inline
`settings-use-distro-mingw` accesses and delete `ToolchainSetting`.
- - - - -
3 changed files:
- hadrian/src/Builder.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Rules/Generate.hs
Changes:
=====================================
hadrian/src/Builder.hs
=====================================
@@ -34,7 +34,6 @@ import Base
import Context
import Oracles.Flag
import Oracles.Setting (setting, Setting(..))
-import Oracles.Setting (settingsFileSetting, ToolchainSetting(..))
import Packages
import GHC.IO.Encoding (getFileSystemEncoding)
@@ -240,7 +239,7 @@ instance H.Builder Builder where
Ghc _ st -> do
root <- buildRoot
unlitPath <- builderPath Unlit
- distro_mingw <- settingsFileSetting ToolchainSetting_DistroMinGW
+ distro_mingw <- lookupSystemConfig "settings-use-distro-mingw"
libffi_adjustors <- useLibffiForAdjustors
use_system_ffi <- flag UseSystemFfi
=====================================
hadrian/src/Oracles/Setting.hs
=====================================
@@ -75,19 +75,6 @@ data Setting = CursesIncludeDir
| BourneShell
| EmsdkVersion
--- TODO compute solely in Hadrian, removing these variables' definitions
--- from aclocal.m4 whenever they can be calculated from other variables
--- already fed into Hadrian.
-
--- | All 'ToolchainSetting's are computed by the ghc-toolchain utility for configuring toolchains.
--- This used to be defined by 'FP_SETTINGS' in aclocal.m4.
---
--- TODO: We should be able to drop this completely, after moving all the toolchain settings to ghc-toolchain
--- Move to ghc-toolchain and to the Target files generated by configure and ghc-toolchain
--- * First we will get rid of DistroMinGW when we fix the windows build
-data ToolchainSetting
- = ToolchainSetting_DistroMinGW
-
-- | Look up the value of a 'Setting' in @cfg/system.config@, tracking the
-- result.
setting :: Setting -> Action String
@@ -128,14 +115,6 @@ setting key = lookupSystemConfig $ case key of
BourneShell -> "bourne-shell"
EmsdkVersion -> "emsdk-version"
--- | Look up the value of a 'SettingList' in @cfg/system.config@, tracking the
--- result.
--- See Note [tooldir: How GHC finds mingw on Windows]
--- ROMES:TODO: This should be queryTargetTargetConfig
-settingsFileSetting :: ToolchainSetting -> Action String
-settingsFileSetting key = lookupSystemConfig $ case key of
- ToolchainSetting_DistroMinGW -> "settings-use-distro-mingw" -- ROMES:TODO: This option doesn't seem to be in ghc-toolchain yet. It corresponds to EnableDistroToolchain
-
-- | An expression that looks up the value of a 'Setting' in @cfg/system.config@,
-- tracking the result.
getSetting :: Setting -> Expr c b String
=====================================
hadrian/src/Rules/Generate.hs
=====================================
@@ -424,7 +424,7 @@ bindistRules = do
, interpolateSetting "LlvmMinVersion" LlvmMinVersion
, interpolateVar "LlvmTarget" $ getTarget tgtLlvmTarget
, interpolateSetting "ProjectVersion" ProjectVersion
- , interpolateVar "SettingsUseDistroMINGW" $ settingsFileSetting ToolchainSetting_DistroMinGW
+ , interpolateVar "SettingsUseDistroMINGW" $ lookupSystemConfig "settings-use-distro-mingw"
, interpolateVar "TablesNextToCode" $ yesNo <$> getTarget tgtTablesNextToCode
, interpolateVar "TargetHasLibm" $ lookupSystemConfig "target-has-libm"
, interpolateVar "TargetPlatform" $ getTarget targetPlatformTriple
@@ -529,7 +529,7 @@ generateSettings settingsFile = do
, ("LLVM opt command", queryTarget optPath)
, ("LLVM llvm-as command", queryTarget llvmAsPath)
, ("LLVM llvm-as flags", queryTarget llvmAsFlags)
- , ("Use inplace MinGW toolchain", expr $ settingsFileSetting ToolchainSetting_DistroMinGW)
+ , ("Use inplace MinGW toolchain", expr $ lookupSystemConfig "settings-use-distro-mingw")
, ("target RTS linker only supports shared libraries", expr $ yesNo <$> targetRTSLinkerOnlySupportsSharedLibs)
, ("Use interpreter", expr $ yesNo <$> ghcWithInterpreter (predStage stage))
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/51837035fea664eb77e5f699b384a82…
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[Git][ghc/ghc][wip/T23675] 243 commits: We can't UNPACK multi-constructor GADTs
by Rodrigo Mesquita (＠alt-romes) 17 Jun '25
by Rodrigo Mesquita (＠alt-romes) 17 Jun '25
17 Jun '25
Rodrigo Mesquita pushed to branch wip/T23675 at Glasgow Haskell Compiler / GHC
Commits:
b6d5b091 by Simon Peyton Jones at 2025-03-11T22:39:23-04:00
We can't UNPACK multi-constructor GADTs
This MR fixes #25672
See Note [Unpacking GADTs and existentials] in GHC.Types.Id.Make
- - - - -
8eae151d by Teo Camarasu at 2025-03-11T22:40:00-04:00
template-haskell: Add explicit exports lists to all remaining modules
- - - - -
db621b58 by Teo Camarasu at 2025-03-11T22:40:00-04:00
template-haskell: fix haddocks
It seems that we need a direct dependency on ghc-internal, otherwise
Haddock cannot find our haddocks
The bug seems to be caused by Hadrian because if I rebuild with
cabal-install (without this extra dependency) then I get accurate
Haddocks.
Resolves #25705
- - - - -
64ea68d9 by Ben Gamari at 2025-03-12T07:11:51-04:00
mk-ghcup-metadata: Clean up and add type annotations
Getting this file right has historically been quite painful as it is a
dynamically-typed script running only late in the release pipeline.
- - - - -
b3f80b07 by Ben Gamari at 2025-03-12T07:12:27-04:00
rts: Drop imports of pthreads functions in cmm sources
These are no longer used. I noticed these while looking for uses of
__PIC__ in Cmm sources.
- - - - -
915a6781 by Matthew Pickering at 2025-03-13T01:46:41-04:00
interfaces: Ensure that forceModIface deeply forces a ModIface
A ModIface is the result of compilation that we keep for a long time in
memory. Therefore, it's very important to manage what we are going to
retain and remove any external references to things which we might have
captured compilation.
If storing your ModIface in memory uses too much space, then store
less things or make it use a more efficient representation.
In the past there have been many space leak bugs by not sufficiently
forcing a ModIface (#15111)
This patch adds all the missing NFData instances for all the places I
could find where we weren't deeply forcing the structure.
- - - - -
24d373a6 by Matthew Craven at 2025-03-13T01:47:18-04:00
Add interface-stability test for ghc-prim
- - - - -
0cb1db92 by sheaf at 2025-03-14T13:11:44-04:00
Don't report used duplicate record fields as unused
This commit fixes the bug reported in #24035 in which the import of a
duplicate record field could be erroneously reported as unused.
The issue is that an import of the form "import M (fld)" can import
several different 'Name's, and we should only report an error if ALL
of those 'Name's are unused, not if ANY are.
Note [Reporting unused imported duplicate record fields]
in GHC.Rename.Names explains the solution to this problem.
Fixes #24035
- - - - -
f1830d74 by Matthew Pickering at 2025-03-14T13:12:21-04:00
binary: Directly copy ShortByteString to buffer rather than go via ByteString
This avoids allocating an intermediate bytestring. I just noticed on a
profile that `putFS` was allocating, and it seemed strange to me why
since it should just copy the contents of the FastString into the
already allocated buffer. It turned out we were going indirectly via a
ByteString.
Fixes #25861
- - - - -
b15fca2b by Matthew Pickering at 2025-03-15T05:36:40-04:00
iface: Store logical parts of ModIface together
The ModIface structure is divided into several logical parts:
1. mi_mod_info: Basic module metadata (name, version, etc.)
2. mi_public: The public interface of the module (the ABI), which includes:
- Exports, declarations, fixities, warnings, annotations
- Class and type family instances
- Rewrite rules and COMPLETE pragmas
- Safe Haskell and package trust information
- ABI hashes for recompilation checking
4. mi_self_recomp: Information needed for self-recompilation checking
(see Note [Self recompilation information in interface files])
5. mi_simplified_core: Optional simplified Core for bytecode generation
(only present when -fwrite-if-simplified-core is enabled)
6. mi_docs: Optional documentation (only present when -haddock is enabled)
7. mi_top_env: Information about the top-level environment of the original source
8. mi_ext_fields: Additional fields for extensibility
This structure helps organize the interface data according to its purpose and usage
patterns. Different parts of the compiler use different fields. By separating them
logically in the interface we can arrange to only deserialize the fields that are needed.
This patch also enforces the invariant that the fields of ModIface are
lazy. If you are keeping a ModIface on disk, then force it using
`forceModIface`. Otherwise, when the `ModIface` is read from disk, only
the parts which are needed from the interface will be deserialised.
In a follow-up patch I will tackle follow-up issues:
* Recompilation checking doesn't take into account exported named defaults (#25855)
* Recompilation checking does not take into account COMPLETE pragmas (#25854)
* mi_deps_ field in an interface is confused about whether the
information is for self-recompilation checking or part of the ABI
(#25844)
Fixes #25845
-------------------------
Metric Decrease:
MultiLayerModulesDefsGhciWithCore
-------------------------
- - - - -
c758cb71 by Ben Gamari at 2025-03-15T05:37:17-04:00
configure: Fix incorrect SettingsLlvmAsFlags value
Previously this was set to `LlvmAsCmd` rather than `LlvmAsFlags`,
resulting in #25856.
- - - - -
cfaaca14 by sheaf at 2025-03-18T20:05:03-04:00
Fix buglet in isEmptyWorkList
There was a missing case in GHC.Tc.Solver.InertSet.isEmptyWorkList; it
mistakenly ignored the 'wl_rw_eqs' field. This commit simply fixes that.
No test case.
- - - - -
9f9fe0b3 by sheaf at 2025-03-18T20:05:03-04:00
Add mapMaybeTM method to TrieMap class
This commit adds a new method to the TrieMap class, mapMaybeTM, and
adds implementations to all the instances.
mapMaybeTM is useful when filtering containers that contain other
containers.
- - - - -
393531ff by Simon Peyton Jones at 2025-03-18T20:05:03-04:00
Specialising expressions -- at last
This MR addresses #24359, which implements the GHC proposal 493 on SPECIALISE pragmas.
* The old code path (using SpecSig and SpecPrag) still exists.
* The new code path (using SpecSigE and SpecPragE) runs alongside it.
* All SPECIALISE pragmas are routed through the new code path, except
if you give multiple type sigs, when the old code path is still used.
* Main documentation: Note [Handling new-form SPECIALISE pragmas] in
GHC.Tc.Gen.Sig`
Thanks to @sheaf for helping with this MR.
The Big Thing is to introduce
{-# SPECIALISE forall x. f @Int x True #-}
where you can give type arguments and value argument to specialise; and
you can quantify them with forall, just as in Rules.
I thought it was going to be pretty simple, but it was a Long, Long Saga.
Highlights
* Overview Note [Handling new-form SPECIALISE pragmas] in GHC.Tc.Gen.Sig
- New data constructor `SpecSigE` in data type `L.H.S.Binds.Sig`
- New data construtor `SpecPragE` in data type `GHC.Hs.Binds.TcSpecPrag`
- Renamer: uses `checkSpecESigShape` to decide which function to assocate the
SPECIALISE pragma with
- Some of the action is in `GHC.Tc.Gen.Sig.tcSpecPrag`
- The rest is in `GHC.HsToCore.Binds.dsSpec`
* We use a new TcS mode, TcSFullySolve, when simplifying the Wanteds
that arise from the specialise expression. The mechanism is explained
in Note [TcSFullySolve] in GHC.Tc.Solver.Monad. The reason why we need
to do this is explained in Note [Fully solving constraints for specialisation]
in GHC.Tc.Gen.Sig.
* All of GHC.Tc.Gen.Rule is moved into GHC.Tc.Gen.Sig, because the code is
very closely related.
* The forall'd binders for SPECIALISE are the same as those for a RULE, so I
refactored, introducing data type `L.H.S.Binds.RuleBndrs`, with functions
to rename, zonk, typecheck it. I refactored this data type a bit; nicer now.
* On the LHS of RULES, or SPECIALISE, we want to disable the tricky mechanims
described in Note [Desugaring non-canonical evidence] in GHC.HsToCore.Expr.
Previously it wasn't fully disabled (just set to the empty set), and that
didn't quite work in the new regime.
* There are knock-on changes to Template Haskell.
* For the LHS of a RULE and a SPECIALISE expression, I wanted to simplify
it /without/ inlining the let-bindings for evidence variables. I added
a flag `so_inline` to the SimpleOpt optimiser to support this. The
entry point is `GHC.Core.SimpleOpt.simpleOptExprNoInline`
* Since forever we have had a hack for type variables on the LHS of
RULES. I took the opportunity to tidy this up. The main action is
in the zonker. See GHC.Tc.Zonk.Type Note [Free tyvars on rule LHS],
and especially data construtor `SkolemiseFlexi`
in data type `GHC.Tc.Zonk.Env.ZonkFlexi`
* Move `scopedSort` from GHC.Core.TyCo.FVs to GHC.Core.Predicate
Reason: it now works for Ids as well, and I wanted to use isEvVar,
which is defined in GHC.Core.Predicate
Avoiding module loops meant that instead of exporting GHC.Core.TyCo.Tidy
from GHC.Core.Type, modules now import the former directly.
I also took the opportunity to remove unused exports
from GHC.Core.Type.hs-boot
* Flag stuff:
- Add flag `-Wdeprecated-pragmas` and use it to control the warning when
using old-style SPECIALISE pragmas with multiple type ascriptions,
- Add flag `-Wuseless-specialisations` and use it to control the warning emitted
when GHC determines that a SPECIALISE pragma would have no effect. Don't
want if the SPECIALISE is SPECIALISE INLINE (#4444)
In response to #25389, we continue to generate these seemingly code for these
seemingly useless SPECIALISE pragmas
- Adds deprecations to Template Haskell `pragSpecD` and `pracSpecInlD`,
* Split up old-style SPECIALISE pragmas in GHC.Internal.Float,
GHC.Internal.Numeric, GHC.Internal.Real
* Remove useless SPECIALISE pragmas in Data.Array (updating the array submodule)
Smaller things:
- Update the Users Guide
- Add mention of the changes to the 9.14 release notes as well as
the Template Haskell changelog,
- - - - -
1884dd1a by Simon Peyton Jones at 2025-03-18T20:05:03-04:00
Add -Wrule-lhs-equalities warning
This commit adds a new warning, controlled by the warning flag,
-Wrule-lhs-equalities, which is emitted when the LHS of a RULE gives
rise to equality constraints that previous GHC versions would have
quantified over.
GHC instead discards such RULES, as GHC was never able to generate
a rule template that would ever fire; it's better to be explicit about
the fact that the RULE doesn't work.
- - - - -
b00b3ef0 by Ben Gamari at 2025-03-18T20:05:41-04:00
compiler: Add export list to GHC.SysTools.Process
This also revealed that `readProcessEnvWithExitCode` and its local
helpers were dead code.
- - - - -
25850b22 by ARATA Mizuki at 2025-03-18T20:06:25-04:00
Fix code generation for SSE vector operations
The new implementation generates correct code
even if the registers overlap.
Closes #25859
- - - - -
e576468c by Andreas Klebinger at 2025-03-18T20:07:02-04:00
Bump nofib submodule.
Fixes #25867. (Ben-raytrace being broken by library changes)
- - - - -
443fc8b1 by Sjoerd Visscher at 2025-03-19T12:01:04-04:00
Multiplicity annotation on records
Needing to store multiplicity annotations on records triggered a refactoring of AST of data declarations:
Moved HsBangTy and HsRecTy from HsType to HsTypeGhcPsExt, the extension of HsType during parsing, since they are only needed during parsing.
New HsConDeclField that stores all source data shared by all constructor declaration fields: unpackedness, strictness, multiplicity, documentation and the type of the field.
Merged HsMultAnn and HsArrowOf, so all multiplicity annotations share the same data type.
HsBang was no longer needed as a separate type, and was inlined into HsSrcBang.
- - - - -
313cf271 by Ben Gamari at 2025-03-19T12:01:43-04:00
gitlab-ci: Drop CentOS 7 binary distributions
CentOS 7 is EoL and moreover we cannot even build images for it.
See #25061.
- - - - -
5b94f99f by Ben Gamari at 2025-03-19T12:02:21-04:00
rts: Ensure that WinIO flag is set when --io-manager=auto
As noted in #25838, previously `selectIOManager` failed to set
`rts_IOManagerIsWin32Native` in its `IO_MNGR_FLAG_AUTO`. This meant
that the MIO path was taken when WinIO was supposedly selected,
resulting in chaos.
Fixes #25838.
- - - - -
1a3f1131 by Peng Fan at 2025-03-19T12:03:10-04:00
Pass the mcmodel=medium parameter to CC via GHC
Ensure that GHC-driver builds default to mcmodel=medium, so that GHC
passes this default parameter to CC without having to add it to the
compiled project.
Commit e70d41406b5d5638b42c4d8222cd03e76bbfeb86 does not ensure that all
GHC-built object files have a default model of medium, and will raise an
R_LARCH_B26 overflow error.
- - - - -
27cf7361 by Matthew Craven at 2025-03-19T12:03:48-04:00
Add interface-stability test for ghc-bignum
As with ghc-prim, it makes sense to have some protection against
accidental interface changes to this package caused by changes
in ghc-internal.
- - - - -
25d46547 by Matthew Craven at 2025-03-19T12:03:48-04:00
Add README reference for the interface-stability tests
- - - - -
5d65393e by Simon Peyton Jones at 2025-03-20T05:41:24-04:00
Remove the Core flattener
This big MR entirely removes the "flattener" that took a type and
replaced each type-family application with a fresh type variable.
The flattener had its origin in the paper
Injective type families for Haskell
But (a) #25657 showed that flattening doesn't really work.
(b) since we wrote the paper we have introduced the so-called
"fine-grained" unifier GHC.Core.Unify, which can return
* SurelyApart
* Unifiable subst
* MaybeApart subst
where the MaybeApart says that the two types are not unifiable by a
substitution, but could (perhaps) be unified "later" after some type
family reductions. This turns out to subsume flattening.
This MR does a major refactor of GHC.Core.Unify to make it capable of
subsuming flattening. The main payload is described in
Note [Apartness and type families]
and its many wrinkles.
The key (non-refactoring) implementation change is to add `um_fam_env`
to the `UMState` in the unification monad.
Careful review with Richard revealed various bugs in the treament of
`kco`, the kind coercion carried around by the unifier, so that is
substantially fixed too: see Note [Kind coercions in Unify].
Compile-time performance is improved by 0.1% with a few improvements over
1% and one worsening by 1.3% namely T9872a. (I have not investigated the
latter.)
Metric Decrease:
T9872b
T9872c
TcPlugin_RewritePerf
Metric Increase:
T9872a
- - - - -
9003ef0a by sheaf at 2025-03-20T05:42:08-04:00
Remove SDoc from UnknownSubordinate/MissingBinding
This commit replaces unstructured SDoc arguments in error message constructors
with uses of the following two datatypes:
- SigLike: for different kinds of signatures (e.g. standalone kind signatures,
fixity signatures, COMPLETE pragmas, etc)
- Subordinate: for class methods, associated types, and record fields
The following error message constructors now no longer have any SDocs in them:
- TcRnIllegalBuiltinSyntax: SDoc -> SigLike
- MissingBinding: SDoc -> SigLike
- UnknownSubordinate: SDoc -> (Name, Subordinate)
- SuggestMoveToDeclarationSite: SDoc -> SigLike
- - - - -
4329f3b6 by sheaf at 2025-03-20T05:42:08-04:00
Remove SDocs from HsDocContext
This commit removes the remaining SDocs from the HsDocContext data type.
It adds the following constructors:
ClassInstanceCtx -- Class instances
ClassMethodSigCtx -- Class method signatures
SpecialiseSigCtx -- SPECIALISE pragmas
PatSynSigCtx -- Pattern synonym signatures
We now report a bit more information for errors while renaming class instances,
which slightly improves renamer-emitted error messages.
- - - - -
75c29aa1 by sheaf at 2025-03-20T05:42:08-04:00
Reject instance with non-class head in renamer
This commit modifies rnClsInstDecl so that, when renaming, we reject a class
instance declaration in which the head is not a class. Before this change, it
would get rejected in the type-checker, but that meant that the renamer could
emit unhelpful error messages, e.g.:
data Foo m a
instance Foo m where
fmap _ x = case x of
would rather unhelpfully say:
‘fmap’ is not a (visible) method of class ‘Foo’
when of course 'Foo' is not even a class. We now reject the above program
with the following error message:
Illegal instance for data type ‘Foo’.
Instance heads must be of the form
C ty_1 ... ty_n
where ‘C’ is a class.
Fixes #22688
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a8f543a9 by Cheng Shao at 2025-03-20T18:47:19-04:00
testsuite: mark T7919 as fragile on i386 as well
T7919 may also fail i386 CI jobs with test timeout.
- - - - -
256ac29c by sheaf at 2025-03-20T18:48:07-04:00
Don't cache solved [W] HasCallStack constraints
This commit ensures we do not add solved Wanted constraints that mention
HasCallStack or HasExceptionContext constraints to the set of solved
Wanted dictionary constraints: caching them is invalid, because re-using
such cached dictionaries means using an old call-stack instead of
constructing a new one, as was reported in #25529.
Fixes #25529.
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47646ce2 by Andrew Lelechenko at 2025-03-20T18:48:43-04:00
Improve haddock-visible documentation for GHC.Driver.Flags
- - - - -
2e4e15ed by Sylvain Henry at 2025-03-21T17:49:36-04:00
Document -fnum-constant-folding (#25862)
- - - - -
044a6e08 by sheaf at 2025-03-21T17:50:24-04:00
LLVM: fix typo in padLiveArgs
This commit fixes a serious bug in the padLiveArgs function, which
was incorrectly computing too many padding registers. This caused
segfaults, e.g. in the UnboxedTuples test.
Fixes #25770
Fixes #25773
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1745c749 by Teo Camarasu at 2025-03-22T18:42:37-04:00
template-haskell: remove Language.Haskell.TH.Lib.Internal
This module is purely used for the implementation of TH quote
desugarring.
Historically this needed to be exposed from `template-haskell`, since
that's the package that the desugarred expressions referenced but since
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12479, this is no
longer the case.
Now these identifiers are in `ghc-internal`.
Note that this module has carried the following warning for a long time:
> This is not a part of the public API, and as such, there are no API guarantees for this
module from version to version.
Resolves #24766
- - - - -
3bc507db by Alan Zimmerman at 2025-03-22T18:43:13-04:00
EPA: Fix exact printing of SPECIALISE pragma
This commit fixes two minor issues with exactprinting of the
SPECIALISE pragma after !12319 landed
- The span for the RHS did not include the optional signature type
- The `::` was printed twice when the legacy path was used
Closes #25885
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bdf93da8 by sheaf at 2025-03-24T11:25:12+01:00
Renamer: improve handling of export children
This commit refactors the 'childGREPriority' function which is used when
renaming subordinate items in export lists and class declarations.
Instead of having a complicated LookupChild parameter, we now simply pass the
GREInfo of the parent, which allows us to decide what is a valid child:
- classes can have children that are in the type constructor namespace,
- promoted data constructors should be treated the same as normal data
constructors.
Fixes #24027
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1dbc7846 by Matthew Pickering at 2025-03-24T15:35:17-04:00
Revert "mk-ghcup-metadata: Clean up and add type annotations"
This reverts commit 64ea68d9a206ec4db5020b0a3fc563199ab18be3.
See #25889
- - - - -
6941c825 by doyougnu at 2025-03-25T10:05:58-04:00
base: construct compat RTSFlags
-- see CLC #289
- - - - -
730e6f77 by doyougnu at 2025-03-25T10:06:02-04:00
base: construct compat GHC.Stats
-- see CLC #289
- - - - -
cd9e6605 by Ben Gamari at 2025-03-25T17:59:52-04:00
rel_eng/upload: Clarify usage directions
Previously it was not made clear that the directory name is significant.
- - - - -
7d18c19b by Cheng Shao at 2025-03-25T22:00:56+00:00
ghci: make the Pipe type opaque
This commit makes the Pipe type in ghci opaque, and introduce the
mkPipeFromHandles constructor for creating a Pipe from a pair of
Handles. Pipe is now just a pair of receiver/sender continuations
under the hood. This allows a Pipe to be potentially backed by other
IPC mechanisms (e.g. WebSockets) which is essential for wasm ghci
browser mode.
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a2103fd2 by Cheng Shao at 2025-03-25T22:00:56+00:00
ghci: use improved Pipe logic for wasm iserv
This commit makes wasm iserv take advantage of the Pipe refactoring by
passing binary receiver/sender js callbacks from the dyld script. This
paves the way for piping the binary messages through WebSockets in
order to run wasm iserv in the browser, but more importantly, it
allows us to get rid of a horrible hack in the dyld script: we no
longer have to fake magical wasi file descriptors that are backed by
nodejs blocking I/O! The legacy hack was due to these facts:
- iserv only supported exchanging binary messages via handles backed
by file descriptors
- In wasi you can't access host file descriptors passed by host ghc
- The nodejs wasi implementation only allows mapping host directories
into the wasi vfs, not host file descriptors
- Named pipes with file paths (mkfifo) doesn't work well with nodejs
wasi implementation, causes spurious testsuite failures on macos
But starting from this point, we can fully take advantage of
non-blocking I/O on the js side.
- - - - -
fa2fbd2b by Cheng Shao at 2025-03-25T22:00:56+00:00
ghci: fix ^C handling for wasm iserv
This commit fixes ^C handling for wasm iserv. Previously we didn't
handle it at all, so ^C would kill the node process and host ghc would
then crash as well. But native ghc with external interpreter can
handle ^C just fine and wasm should be no different. Hence the fix:
wasm iserv exports its signal handler as a js callback to be handled
by the dyld script. Also see added note for details.
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efcebed6 by Cheng Shao at 2025-03-25T22:00:56+00:00
wasm: fix post-link.mjs for browser
The wasm ghci browser mode needs to run dyld.mjs in the browser which
imports post-link.mjs. This script makes post-link.mjs runnable in the
browser by deferring node-specific module imports to their actual use
sites.
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27bb73c6 by Cheng Shao at 2025-03-25T22:00:56+00:00
wasm: use console.assert in dyld script
This commit uses console.assert() instead of node-specific strict
assert in the dyld script, in order to make it runnable in the
browser. console.assert() only warns and doesn't crash upon assertion
failure, but this is fine; we can always trivially define a strict
assert function shall it be necessary when debugging, and there hasn't
been such an assertion failure seen in the wild for long enough.
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929df0ba by Cheng Shao at 2025-03-25T22:00:56+00:00
wasm: asyncify the dylink.0 custom section parser
This commit refactors the simple binary parser in the dyld script in
charge of parsing the dylink.0 custom section. Previously the parser
was synchronous and operated on the entire input buffer; this was
simple and easy and worked well enough when the input wasm modules are
instantly read from local filesystem.
However, when running dyld in the browser, the wasm modules are
transferred via fetch() requests. The host ghc and the browser might
not be on the same machine, so slow network uplink does need to be
considered. We only need to parse dylink.0 custom section to extract
dependency info, and dylink.0 is the very first custom section in the
wasm shared library binary payload, so the parsing process should not
require fetch() to complete and should return the parsing result asap.
Hence the refactorings in this commit: asyncify the parser, make it
only consume as many bytes as needed by invoking an async consumer
callback. The input is a readable stream from the fetch() response;
once the response is available, the async wasm compilation can start
in the background, and dylink.0 parsing shall end asap which results
in more wasm shared libraries to be loaded earlier. Profit.
- - - - -
9a697181 by Cheng Shao at 2025-03-25T22:00:56+00:00
wasm: fix dyld setImmediate usage in browser
The wasm dyld script used to only run in node and directly uses
setImmediate in globalThis. In case of browsers, it needs to import
setImmediate from the prelude, hence this commit.
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d9b71e82 by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: fix dyld downsweep filepath handling in browser
The wasm dyld downsweep logic used to rely on nodejs path module to
handle filepaths. That's not available in browsers, so this commit
implements poor man's filepath handling in js, which is not elegant
for sure but works for both nodejs and the browser.
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7003a399 by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: isolate nodejs-specific logic with the isNode flag in dyld
As we move towards supporting running the dyld script in the browser,
this commit implements the isNode module-level binding which is true
if dyld is running in nodejs. The nodejs-specific bits are gated under
isNode.
For the browser case, this commit introduces @bjorn3/browser_wasi_shim
as the wasi implementation; we already use it in quite a few projects
and it simply works.
- - - - -
22ba2a78 by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: isolate dyld side effects that might require IPC
This commit spins out a DyLDHost class from DyLD that handles side
effects that must be run in the same host environment that runs
wasm32-wasi-ghc. When the dyld script runs in the browser, it'll need
to do IPC to find libraries, fetch wasm library, etc, and the other
side of dyld that runs on nodejs would simply expose the DyLDHost
methods as endpoints for WebSockets/HTTP.
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e93fc33d by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: implement wasm ghci browser mode
This commit implements the rest of dyld logic that delivers the ghci
browser mode:
- The dyld script can now fully run in the browser. It communicates
back with dyld-on-nodejs via WebSockets and also plain HTTP 1.1
requests.
- The host dyld starts a server and acts as a broker between the GHC
process and the browser side. GHC doesn't need to know anything
about the browser mode; no driver flags need to be added and no
recompilation needs to happen, the GHC driver continues to use the
original iserv binary messages protocol.
- The dyld broker doesn't need to parse any message between the
browser dyld and GHC; it merely sets up WebSockets connections to
redirect these messages as well as ^C signals.
- Plain HTTP 1.1 is used for IPC requests (e.g. downloading a wasm
module).
- The dyld broker serves a main.js script that bootstraps iserv in the
browser, and a main.html empty page playground for testing. CORS is
enabled so it could be possible to inject iserv into other websites
and use ghci to play with them.
- All the RPC logic is opaque to the DyLD class, the majority of the
wasm dynamic linker code is already portable and runs fine in
firefox/chrome/webkit.
Closes #25399.
- - - - -
fc576798 by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: add puppeteer/playwright support for ghci browser mode
This commit adds support for using puppeteer/playwright for
automatically launching a headless browser that backs the ghci browser
mode. This is useful for testing the ghci browser mode as a part of
GHC testsuite, and it's also convenient for local development since
the step to start iserv can be automated away.
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ad7e271d by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: support wasi console redirect for the ghci browser mode
This commit adds optional support for redirecting wasi console
stdout/stderr back to the host when running wasm ghci browser mode. By
default, the wasi console outputs are only available under F12
devtools console, but in case of testing against a mobile browser, the
devtools console may not be readily available, and it would be more
convenient to at least get wasi console output on the host side.
The redirection logic is simple, just adding another two WebSockets
connections that pump the line-buffered textual messages back to
host.
- - - - -
731217ce by Cheng Shao at 2025-03-25T22:00:57+00:00
wasm: add brotli compression for ghci browser mode
This commit adds brotli compression for wasm shared libraries for ghci
browser mode. With BROTLI_MIN_QUALITY, the overhead is negligible, and
it helps reducing amount of transferred data when the browser connects
to the server over a slow connection.
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ac70e643 by Cheng Shao at 2025-03-26T13:37:19+00:00
testsuite: add browser001 test for wasm ghci browser mode
This commit adds support for testing the wasm ghci browser mode in the
testsuite, as well as a simple first test case browser001 that makes
use of TH, JSFFI and browser-specific DOM API. See added note and
comments for details.
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6ef5c0d2 by Cheng Shao at 2025-03-26T13:37:24+00:00
docs: add wasm ghci subsection in user manual
This commit updates the user manual to add wasm ghci subsection.
- - - - -
37381bcf by Cheng Shao at 2025-03-26T13:37:24+00:00
docs: update Note [The Wasm Dynamic Linker]
This commit updates Note [The Wasm Dynamic Linker] to reflect recent
developments, in particular the wasm ghci browser mode.
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4b5a0f61 by Cheng Shao at 2025-03-26T13:37:24+00:00
ci: bump DOCKER_REV and test wasm ghci browser mode
This commit bumps the ci-images revision for updated wasm toolchain,
and adds the launch options required to test wasm ghci browser mode.
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c6a3bc8f by Cheng Shao at 2025-03-26T13:37:24+00:00
driver: implement wasm ghci browser mode flags
This commit implements GHC driver flags that enable the wasm ghci
browser mode.
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f75e823e by Cheng Shao at 2025-03-26T18:01:54-04:00
rts: add hs_try_putmvar_with_value to RTS API
This commit adds hs_try_putmvar_with_value to rts. It allows more
flexibility than hs_try_putmvar by taking an additional value argument
as a closure to be put into the MVar. This function is used & tested
by the wasm backend runtime, though it makes sense to expose it as a
public facing RTS API function as well.
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9cd9f347 by Cheng Shao at 2025-03-26T18:01:54-04:00
wasm: use MVar as JSFFI import blocking mechanism
Previously, when blocking on a JSFFI import, we push a custom
stg_jsffi_block stack frame and arrange the `promise.then` callback to
write to that stack frame. It turns out we can simply use the good old
MVar to implement the blocking logic, with a few benefits:
- Less maintenance burden. We can drop the stg_jsffi_block related Cmm
code without loss of functionality.
- It interacts better with existing async exception mechanism. throwTo
would properly block the caller if the target thread is masking
async exceptions.
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da34f0aa by Cheng Shao at 2025-03-26T18:01:54-04:00
wasm: properly pin the raiseJSException closure
We used to use keepAlive# to pin the raiseJSException closure when
blocking on a JSFFI import thunk, since it can potentially be used by
RTS. But raiseJSException may be used in other places as well (e.g.
the promise.throwTo logic), and it's better to simply unconditionally
pin it in the JSFFI initialization logic.
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dc904bfd by Cheng Shao at 2025-03-26T18:01:54-04:00
wasm: implement promise.throwTo() for async JSFFI exports
This commit implements promise.throwTo() for wasm backend JSFFI
exports. This allows the JavaScript side to interrupt Haskell
computation by raising an async exception. See subsequent docs/test
commits for more details.
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7f80455e by Cheng Shao at 2025-03-26T18:01:55-04:00
testsuite: add test for wasm promise.throwTo() logic
This commit adds a test case to test the wasm backend
promise.throwTo() logic.
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afdd3fe7 by Cheng Shao at 2025-03-26T18:01:55-04:00
docs: document the wasm backend promise.throwTo() feature
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65dc65dc by sheaf at 2025-03-26T18:02:43-04:00
Refactor CtEvidence into Given/Wanted
This commit is a simple refactoring which splits up the CtEvidence,
giving each constructor its own datatype:
data CtEvidence
= CtGiven GivenCtEvidence
| CtWanted WantedCtEvidence
data GivenCtEvidence =
GivenCt
{ ctev_pred :: TcPredType
, ctev_evar :: EvVar
, ctev_loc :: CtLoc }
data WantedCtEvidence =
WantedCt
{ ctev_pred :: TcPredType
, ctev_dest :: TcEvDest
, ctev_loc :: CtLoc
, ctev_rewriters :: RewriterSet }
This enables a few minor simplifications in the code, notably removing
a panic from GHC.Tc.Solver.Solve.solveWantedForAll_implic.
Fixes #25848
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ada04031 by sheaf at 2025-03-26T18:03:27-04:00
Export lists: same prio for NoParent & RightParent
This commit ensures that, when we are renaming children in an export
list item such as
module M ( P(A,B,C) )
we consider children with NoParent to have the same priority as children
which have the correct parent (P in this case). This is because we
should **not** prioritise a data constructor (with the right parent)
over a pattern synonym we are bundling (which, before bundling, has
no parent).
Fixes #25892
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721628a0 by Adriaan Leijnse at 2025-03-27T09:10:10-04:00
TTG: Replace HsUnboundVar with HsHole
Context:
The HsUnboundVar constructor in Language.Haskell.Syntax.Expr contained a
RdrName, which stood in the way of the work towards a dedicated
haskell-syntax library. The constructor was overloaded for unbound
variables, anonymous and named holes, and parse errors.
This commit:
Replaces HsUnboundVar with HsHole. In the surface syntax HsHole only
represents an anonymous expression hole ("_"). It is extended with the
XHole type family.
In the concrete GHC implementation of the language on the other hand,
HsHole is used for "any thing which is not necessarily a valid or fully
defined program fragment, but for which a type can be derived". This use
is similar to how HsUnboundVar was used, but the parse error case is now
made explicit with a ParseError case for XHole. This is in anticipation
of future work on a fault tolerant compilation pipeline.
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dbd852f5 by Ben Gamari at 2025-03-27T09:10:48-04:00
rel_eng: Finish removal of CentOS jobs
Remove centos7 from release fetch and ghcup metadata generation scripts.
Closes #25893.
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0e0231e7 by Matthew Pickering at 2025-03-28T18:36:33-04:00
hadrian: Make hash_unit_ids into a flavour transformer (and enable for release flavour)
The primary reason for this change is to make the `release` flavour
enable `--hash-unit-ids` by default without any further user intervention.
* Packagers don't have to be aware of this special flag they should be
using.
* release builds on CI are uniformly testing with hashes (see !13418)
Fixes #25379
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9fc54c12 by Rodrigo Mesquita at 2025-03-28T18:37:10-04:00
driver: Move DynFlags consistency fixes off Main
These consistency fixes found in Main.hs are required for the proper
functioning of the compiler and should live together with all remaining
fixes in `makeDynFlagsConsistent`.
This is especially relevant to GHC applications that shouldn't have to
copy/fix themselves possibly inconsistent DynFlags.
Additionally, outputs information when verbosity is high about these
consistency fixes that were previously quiet, adds information to the
Note on consistency of DynFlags, and improves one of the fixes that
incorrectly used `dynNow`.
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2fdd0be9 by sheaf at 2025-03-28T18:37:53-04:00
Remove GhcHint from TcRnNotInScope constructor
This is a tiny refactoring which:
- removes GhcHint/ImportError fields from some constructors of
TcRnMessage, using the TcRnMessageDetailed mechanism instead to
report this informaiton:
- removes the GhcHint and ImportErrors fields from TcRnNotInScope
- removes the GhcHint field from TcRnTermNameInType
- ensures that we only include these hints and import errors when the
-fhelpful-errors flag is turned on
Fixes #25874
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9e5cd064 by ARATA Mizuki at 2025-03-31T14:53:34-04:00
Better support for SSE3 and SSE4.1
In particular:
* Pass appropriate attributes to LLVM
* Define preprocessor macros for them
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c2c7dd51 by ARATA Mizuki at 2025-03-31T14:53:34-04:00
x86: Add support for SSSE3
This commit adds the `-mssse3` flag, which controls usage of SSSE3 instructions in x86 code generation.
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d7c62580 by ARATA Mizuki at 2025-03-31T14:53:34-04:00
x86 NCG SIMD: Implement 128-bit integer vector arithmetics
This commit implements the following operations on integer vectors:
* negateIntNXM#
* plus{Int,Word}NXM#
* minus{Int,Word}NXM#
* times{Int,Word}NXM#
* quot{Int,Word}NXM#
* rem{Int,Word}NXM#
* min{Int,Word}NXM#
* max{Int,Word}NXM#
where (N,M) is one of (8,16), (16,8), (32,4), or (64,2).
Closes #25643
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f5ea4e7e by ARATA Mizuki at 2025-03-31T14:53:34-04:00
x86 NCG SIMD: Implement 128-bit integer vector shuffle
This commit implements the following operations:
* shuffle{Int,Word}8X16#
* shuffle{Int,Word}16X8#
* shuffle{Int,Word}32X4#
* shuffle{Int,Word}64X2#
See #25643
- - - - -
5eeb6645 by Simon Peyton Jones at 2025-03-31T14:54:16-04:00
Re-jig the way that the Simplifier tries RULES
As #25170 showed, if a new RULE appears, it could change the simplifier's
behaviour a bit, even if it never fires; and that messes up deterministic
compilation. (This was particularly nasty if the rule wasn't even transitively
below the module being compiled.)
This MR rejigs the use of `tryRules` so that behaviour does not change
when a new, unrelated RULE is added. It's described in
* Note [When to apply rewrite rules]
* Note [tryRules: plan (BEFORE)]
* Note [tryRules: plan (AFTER)]
The main change is in the refactored version of
* simplOutId
* rebuildCall
The little state machine that was embedded in ArgInfo is gone.
As I wandered around the Simplifier I also found opportunities for
some loosely-related refactoring:
* In several places, the /substitution/ in the SimpleEnv is empty;
all we care about is the in-scope set and the flags. So
- I made a synonym `SimplEnvIS` that embodies that invariant,
- used it in a number of type signatures (notably `rebuild`)
- added some assertion checks (via `checkSimlEnvIS`)
* I moved the hanlding of `runRW` out of `rebuildCall` (where we
would have to test repeatedly) and into the new `simplOutId`, which
fires up `rebuildCall`. Now it is only tested once.
-------------------------
Metric Decrease:
T9020
T9961
-------------------------
- - - - -
f534474a by sheaf at 2025-03-31T14:54:59-04:00
Add comment: no qualified Names in the LocalRdrEnv
This commit adds a reference to section 5.5.1 of the Haskell 2010 report,
to explain that qualified names can't occur in the LocalRdrEnv.
Fixes #25875
- - - - -
d5ea80c6 by Patrick at 2025-03-31T14:55:42-04:00
Fix deadlock/loop in interface rehydration (#25858)
In #25858, GHC hangs when processing modules with class defaults due to a
circular dependency in the interface rehydration process. The deadlock/loop
occurred when eager class defaults rehydration accessed not-yet-complete module details.
To fix the immediate deadlock/loop.
`tcIfaceDefaults` is refactored, we use the class name directly from the iface
and use `forM` for lazy loading the class, which algins with the handling of other fields
of ModDetails. This laziness ensure rehydration waits for HomePackageTable (HPT) to
be updated and prevent premature evaluation of ModDetails inside `fixIO``.
As suggested by Matthew, class defaults importing is also refactored
to align with the compiler's established interface loading conventions.
- add class defaults field to ExternalPackageState (EPS).
- rehydrate and store class defaults in EPS at `loadInterface`.
- Instead of using `tcIfaceDefaults` in `tcRnImports`, we add and use
`tcGetClsDefaults` to read defaults directly from HPT or EPS
when importing modules.
Tests:
- T25858, T25858v1-2: Test class hydration in defaults
- T25858v3-4: Test type list hydration in defaults
New Note [Tricky rehydrating IfaceDefaults loop] is added.
Thanks to @sheaf (Sam), @mpickering (Matthew), and @simonpj (Simon) for their
valuable input and analysis.
Fixes #25858.
- - - - -
2d419d8d by Matthew Pickering at 2025-04-02T16:12:36-04:00
Use unsafePerformIO in definition of computeFingerprint
computeFingerprint is morally a pure function, which is implemented by
mutating a buffer. Using unsafePerformIO inside the definition allows it
to be used in pure contexts, fixing one place where an ad-hoc call to
unsafePerformIO is already needed.
- - - - -
ccdf979b by Matthew Pickering at 2025-04-02T16:12:37-04:00
driver: Fix recompilation checking for exported defaults
Since the exported defaults are not associated with any identifier from
the module, they are just added to the export hash rather than
the fine-grained recompilation logic.
Fixes #25855
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c5bf9892 by Matthew Pickering at 2025-04-02T16:12:37-04:00
driver: Fix recompilation checking for COMPLETE pragmas
A {-# COMPLETE P, Q #-} pragma is associated with the pattern synonyms P
and Q during recompilation checking. Therefore, the existence of a
pattern synonym becomes part of the ABI hash for P and Q.
Then if a module uses these pattern synonyms and a complete pragma
changes, it will trigger recompilation in that module.
Fixes #25854
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d0fd9370 by sheaf at 2025-04-02T16:14:05-04:00
Handle named default exports separately
This commit changes the way we check for duplicate exports of named
default declarations. They are now treated entirely separately from
other exports, because in an export list of the form
module M ( default Cls, Cls )
the default declaration does not export the class 'Cls', but only its
default declarations.
Also fixes a bug in Backpack where named default exports were getting
dropped entirely. No test for that.
Fixes #25857
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62d04494 by Cheng Shao at 2025-04-03T05:56:17-04:00
ci: add x86_64-linux-ubuntu24_04 nightly/release jobs
- - - - -
327952e4 by Cheng Shao at 2025-04-03T05:56:17-04:00
rel-eng: add ubuntu24_04 bindists to ghcup metadata and fetch gitlab scripts
- - - - -
aa1e3b8b by sheaf at 2025-04-03T05:57:24-04:00
GHC settings: always unescape escaped spaces
In #25204, it was noted that GHC didn't properly deal with having
spaces in its executable path, as it would compute an invalid path
for the C compiler.
The original fix in 31bf85ee49fe2ca0b17eaee0774e395f017a9373 used a
trick: escape spaces before splitting up flags into a list. This fixed
the behaviour with extra flags (e.g. -I), but forgot to also unescape
for non-flags, e.g. for an executable path (such as the C compiler).
This commit rectifies this oversight by consistently unescaping the
spaces that were introduced in order to split up argument lists.
Fixes #25204
- - - - -
34a9b55d by lazyLambda at 2025-04-04T06:22:26-04:00
Driver: make MonadComprehensions imply ParallelListComp
This commit changes GHC.Driver.Flags.impliedXFlags to make the
MonadComprehensions extension enable the ParallelListComp extension.
Fixes #25645
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d99eb7cd by sheaf at 2025-04-04T06:23:28-04:00
NamedDefaults: handle poly-kinded unary classes
With this commit, we accept named default declarations for poly-kinded
classes such as Typeable, e.g.
default Typeable (Char)
This used to fail because we assumed the kind of the class was monomorphic,
e.g.
Type -> Constraint
(Type -> Type) -> Constraint
Nat -> Constraint
Now, we can handle a simple polymorphic class such as
Typeable :: forall k. k -> Constraint
Note that we keep the restriction that the class must only have
one visible argument.
This is all explained in the new Note [Instance check for default declarations]
in GHC.Tc.Gen.Default.
Fixes #25882
- - - - -
4cbc90de by sheaf at 2025-04-04T11:39:05-04:00
LLVM: add type annotations to AtomicFetch_cmm.cmm
- - - - -
e2237305 by sheaf at 2025-04-04T11:39:05-04:00
Cmm lint: lint argument types of CallishMachOps
This commit adds a new check to Cmm lint to ensure that the argument
types to a CallishMachOp are correct. The lack of this check was
detected in the AtomicFetch test: the literals being passed as the
second arguments to operations such as 'fetch_add', 'fetch_and'... were
of the wrong width, which tripped up the LLVM backend.
- - - - -
9363e547 by Cheng Shao at 2025-04-04T11:39:50-04:00
ci: add ghc-wasm-meta integration testing jobs
This patch adds ghc-wasm-meta integration testing jobs to the CI
pipeline, which are only triggered via the `test-wasm` MR label or
manually when the `wasm` label is set.
These jobs will fetch the wasm bindists and test them against a
variety of downstream projects, similarly to head.hackage jobs for
native bindists, offering a convenient way to catch potential
downstream breakage while refactoring the wasm backend.
- - - - -
27029e60 by Adam Gundry at 2025-04-04T11:40:36-04:00
base: Minor fixes to GHC.Records haddocks
This corrects a stale reference to OverloadedRecordFields (which should
be OverloadedRecordDot), fixes the haddock link syntax and adds an
@since pragma.
- - - - -
f827c4c6 by Rodrigo Mesquita at 2025-04-07T11:22:10-04:00
Parametrize default logger action with Handles
Introduce `defaultLogActionWithHandles` to allow GHC applications to use
GHC's formatting but using custom handles.
`defaultLogAction` is then trivially reimplemented as
```
defaultLogActionWithHandles stdout stderr
```
- - - - -
5dade5fd by sheaf at 2025-04-07T11:23:02-04:00
Finer-grained recompilation checking for exports
This commit refines the recompilation checking logic, to avoid
recompiling modules with an explicit import list when the modules they
import start exporting new items.
More specifically, when:
1. module N imports module M,
2. M is changed, but in a way that:
a. preserves the exports that N imports
b. does not introduce anything that forces recompilation downstream,
such as orphan instances
then we no longer require recompilation of N.
Note that there is more to (2a) as initially meets the eye:
- if N includes a whole module or "import hiding" import of M,
then we require that the export list of M does not change,
- if N only includes explicit imports, we check that the imported
items don't change, e.g.
- if we have @import M(T(K, f), g)@, we must check that N
continues to export all these identifiers, with the same Avail
structure (i.e. we should error if N stops bundling K or f with
T)
- if we have @import M(T(..))@, we must check that the children
of T have not changed
See Note [When to recompile when export lists change?] in GHC.Iface.Recomp.
This is all tested in the new tests RecompExports{1,2,3,4,5}
Fixes #25881
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f32d6c2b by Andreas Klebinger at 2025-04-07T22:01:25-04:00
NCG: AArch64 - Add -finter-module-far-jumps.
When enabled the arm backend will assume jumps to targets outside of the
current module are further than 128MB away.
This will allow for code to work if:
* The current module results in less than 128MB of code.
* The whole program is loaded within a 4GB memory region.
We have seen a few reports of broken linkers (#24648) where this flag might allow
a program to compile/run successfully at a very small performance cost.
-------------------------
Metric Increase:
T783
-------------------------
- - - - -
553c280b by Andreas Klebinger at 2025-04-07T22:02:11-04:00
Revert "rts: fix small argument passing on big-endian arch (fix #23387)"
Based on analysis documented in #25791 this doesn't fully fix the big
while introducing new bugs on little endian architectures.
A more complete fix will have to be implemented to fix #23387
This reverts commit 4f02d3c1a7b707e609bb3aea1dc6324fa19a5c39.
- - - - -
b0dc6599 by Andreas Klebinger at 2025-04-07T22:02:11-04:00
Interpreter: Fixes to handling of subword value reads/writes.
Load subword values as full words from the stack truncating/expanding as
neccesary when dealing with subwords. This way byte order is implicitly
correct.
This commit also fixes the order in which we are pushing literals onto
the stack on big endian archs.
Last but not least we enable a test for ghci which actually tests these
subword operations.
- - - - -
ed38c09b by Cheng Shao at 2025-04-07T22:02:53-04:00
testsuite: don't test WasmControlFlow stdout
This patch solves a potential test flakiness in `WasmControlFlow` by
removing `WasmControlFlow.stdout` which is not so portable/stable as
it seems. See added `Note [WasmControlFlow]` for more detailed
explanation.
- - - - -
f807c590 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
debugger: Add docs to obtainTermFromId
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5dba052d by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
Move logic to find and set Breakpoint to GHC
Breakpoints are uniquely identified by a module and an index unique
within that module. `ModBreaks` of a Module contains arrays mapping from
this unique breakpoint index to information about each breakpoint. For
instance, `modBreaks_locs` stores the `SrcSpan` for each breakpoint.
To find a breakpoint using the line number you need to go through all
breakpoints in the array for a given module and look at the line and
column stored in the `SrcSpan`s. Similarly for columns and finding
breakpoints by name.
This logic previously lived within the `GHCi` application sources,
however, it is common to any GHC applications wanting to set
breakpoints, like the upcoming `ghc-debugger`.
This commit moves this logic for finding and setting breakpoints to the
GHC library so it can be used by both `ghci` and `ghc-debugger`.
- - - - -
bc0b9f73 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
Refactor and move logic for identifier breakpoints
Breakpoints can be set on functions using syntax of the form
`[Module.]function`. The parsing, resolution (e.g. inferring implicit
module), and validation of this syntax for referring to functions was
tightly coupled with its GHCi use.
This commit extracts the general purpose bits of resolving this syntax
into `GHC.Runtime.Debugger.Breakpoints` so it can be further used by
other GHC applications and to improve the code structure of GHCi.
Moreover, a few utilities that do splitting and joining of identifiers
as strings were moved to `GHC.Runtime.Eval.Utils`, which also can be
used in the future to clean up `GHC.Runtime.Eval` a bit.
- - - - -
4f728d21 by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
debugger: derive Ord for BreakpointIds
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5528771c by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00
debugger: Move context utils from GHCi to GHC
Moves `enclosingTickSpan`, `getCurrentBreakSpan`, and
`getCurrentBreakModule`, general utilities on the internal debugger
state, into the GHC library.
- - - - -
4871f543 by sheaf at 2025-04-08T17:42:43-04:00
Implicit quantification in type synonyms: add test
This adds a test for ticket #24090, which involves implicit
quantification in type synonyms.
The underlying issue was fixed in 0d4ee209dfe53e5074d786487f531dabc36d561c.
- - - - -
48917d3c by sheaf at 2025-04-08T17:42:44-04:00
Turn on implicit-rhs-quantification by default
This flag was added to GHC 9.8, and will be removed in a future GHC
release. In preparation, this commit adds it to the default warning
flags.
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629be068 by Rodrigo Mesquita at 2025-04-08T17:43:26-04:00
debugger: Add breakpoints to every Stmt
While single-stepping through a Haskell program we stop at every
breakpoint. However, we don't introduce breakpoints at every single
expression (e.g. single variables) because they would be too many and
uninteresting.
That said, in a do-block, it is expected that stepping over would break
at every line, even if it isn't particularly interesting (e.g. a single
arg like getArgs). Moreover, let-statements in do-blocks, despite only
being evaluated once needed, lead to surprising jumps while stepping
through because some have outermost (outside the let) breakpoints
while others don't.
This commit makes every statement in a do-block have a breakpoint.
This leads to predictable stepping through in a do-block.
Duplicate breakpoints in the same location are avoided using the
existing blacklist mechanism, which was missing a check in one relevant place.
Fixes #25932
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99a3affd by Matthew Pickering at 2025-04-08T17:44:08-04:00
driver: refactor: Split downsweep and MakeAction into separate modules.
This will facilitate using the downsweep functions in other parts of
the compiler than just --make mode.
Also, the GHC.Driver.Make module was huge. Now it's still huge but
slightly smaller!
- - - - -
ecfec4df by sheaf at 2025-04-09T14:13:12-04:00
Store user-written qualification in the GhcRn AST
This commit ensures we store the original user-written module
qualification in the renamed AST. This allows us to take into account
the user-written qualification in error messages.
Fixes #25877
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97c884e2 by sheaf at 2025-04-09T14:13:12-04:00
TcRnIllegalTermLevelUse: simpler error when possible
This commit makes GHC emit a simple error message in the case of an
illegal term-level use of a data constructor: we will try to report an
out-of-scope error instead of a "Illegal term level use" error, as the
latter might be a bit overwhelming for newcomers.
We do this when we have a data constructor import suggestion to provide
to the user. For example:
module M where { data A = A }
module N where
import M(A)
x = Bool
-- Illegal term-level use of Bool
y = A
-- Data constructor not in scope: A.
-- Perhaps add 'A' to the import list of 'M'.
This commit also revamps the "similar names" suggestion mechanism,
and in particular its treatment of name spaces. Now, which name spaces
we suggest is based solely on what we are looking for, and no longer on
the NameSpace of the Name we have. This is because, for illegal term-level
use errors, it doesn't make much sense to change the suggestions based
on the fact that we resolved to e.g. a type constructor/class; what
matters is what we were expecting to see in this position.
See GHC.Rename.Unbound.{suggestionIsRelevant,relevantNameSpace} as well
as the new constructors to GHC.Tc.Errors.Types.WhatLooking.
Fixes #23982
- - - - -
bff645ab by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00
driver: Split Session functions out of Main
This commit moves out functions that help in creating and validating a
GHC multi session from Main into the ghc library where they can be used by
other GHC applications.
Moreover, `Mode` processing and `checkOptions` linting were moved to
separate modules within the ghc-bin executable package.
In particular:
- Move `Mode` types and functions (referring to the mode GHC is running
on) to `ghc-bin:GHC.Driver.Session.Mode`
- Move `checkOptions` and aux functions, which validates GHC DynFlags
based on the mode, to `ghc-bin:GHC.Driver.Session.Lint`
- Moves `initMulti`, `initMake`, and aux functions, which initializes a make/multi-unit
session, into `ghc:GHC.Driver.Session.Units`.
- - - - -
501b015e by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00
docs: Improve haddock of ExecComplete
- - - - -
dea98988 by Andreas Klebinger at 2025-04-09T19:23:57-04:00
Avoid oversaturing constructor workers.
Constructor applications always need to take the exact number of
arguments. If we can't ensure that instead apply the constructor worker
like a regular function.
Fixes #23865
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f1acdd2c by sheaf at 2025-04-09T19:25:41-04:00
NamedDefaults: require the class to be standard
We now only default type variables if they only appear in constraints
of the form `C v`, where `C` is either a standard class or a class with
an in-scope default declaration.
This rectifies an oversight in the original implementation of the
NamedDefault extensions that was remarked in #25775; that implementation
allowed type variables to appear in unary constraints which had arbitrary
classes at the head.
See the rewritten Note [How type-class constraints are defaulted] for
details of the implementation.
Fixes #25775
Fixes #25778
- - - - -
5712e0d6 by Vladislav Zavialov at 2025-04-10T05:17:38+00:00
Retry type/class declarations and instances (#12088)
Retry type/class declarations and instances to account for non-lexical
dependencies arising from type/data family instances.
This patch improves the kind checker's ability to use type instances in kind
checking of other declarations in the same module.
* Key change: tcTyAndClassDecls now does multiple passes over the TyClGroups,
as long as it is able to make progress.
See the new Note [Retrying TyClGroups] in GHC.Tc.TyCl
* Supporting change: FVs of a TyClGroup are now recorded in its extension
field, namely XCTyClGroup.
See the new Note [Prepare TyClGroup FVs] in GHC.Rename.Module
* Instances are no longer inserted at the earliest positions where their FVs
are bound. This is a simplification.
See the new Note [Put instances at the end] in GHC.Rename.Module
* Automatic unpacking is now more predictable, but fewer fields get unpacked
by default. Use explicit {-# UNPACK #-} pragmas instead.
See the new Note [Flaky -funbox-strict-fields with type/data families]
For the wide range of newly accepted programs, consult the added test cases.
Fixed tickets:
#12088, #12239, #14668, #15561, #16410, #16448, #16693,
#19611, #20875, #21172, #22257, #25238, #25834
Metric Decrease:
T8095
- - - - -
bc73a78d by sheaf at 2025-04-10T15:07:24-04:00
checkFamApp: don't be so eager to cycle break
As remarked in #25933, a pure refactoring of checkTyEqRhs in
ab77fc8c7adebd610aa0bd99d653f9a6cc78a374 inadvertently changed behaviour,
as it caused GHC to introduce cycle-breaker variables in some
unnecessary circumstances.
This commit refactors 'GHC.Tc.Utils.Unify.checkFamApp' in a way that
should restore the old behaviour, so that, when possible, we first
recur into the arguments and only introduce a cycle breaker if this
recursion fails (e.g. due to an occurs check failure).
Fixes #25933
- - - - -
3acd8182 by Andreas Klebinger at 2025-04-10T22:32:12-04:00
Expand docs for RTS flag `-M`.
The behaviour of how/when exceptions are raised was not really covered
in the docs.
- - - - -
026c1a39 by Adam Sandberg Ericsson at 2025-04-10T22:32:56-04:00
add cases for more SchedulerStatus codes in rts_checkSchedStatus
- - - - -
5977c6a1 by sheaf at 2025-04-10T22:33:46-04:00
Squash warnings in GHC.Runtime.Heap.Inspect
There were incomplete record selector warnings in GHC.Runtime.Heap.Inspect
due to the use of the partial 'dataArgs' record selector. This is fixed
by passing the fields to the 'extractSubTerms' function directly,
rather than passing a value of the parent data type.
- - - - -
6a3e38f5 by Andreas Klebinger at 2025-04-11T15:13:53-04:00
hadrian: Make ghcWithInterpreter the universal source of truth about availability of the interpreter
We were doing some ad-hoc checks in different places in hadrian to
determine whether we supported the interprter or not. Now this check if
confined to one function, `ghcWithInterpreter`, and all the places which
use this information consult `ghcWithInterpreter` to determine what to
do.
Fixes #25533.
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207de6f1 by Matthew Pickering at 2025-04-11T15:14:37-04:00
testsuite: Fix running TH tests with profiled dynamic compiler
Previously, I had failed to update the ghc_th_way_flags logic for the
profiled dynamic compiler.
In addition to this `ghc_dynamic` was incorrectly set for profiled
dynamic compiler.
I also updated MultiLayerModulesTH_OneShot test to work for any compiler
linkage rather than just dynamic.
Fixes #25947
-------------------------
Metric Decrease:
MultiLayerModulesTH_Make
-------------------------
- - - - -
5455f2b9 by Matthew Pickering at 2025-04-12T08:31:36-04:00
driver: Add support for "Fixed" nodes in the ModuleGraph
A fixed node in the module graph is one which we presume is already
built. It's therefore up to the user to make sure that the interface
file and any relevant artifacts are available for a fixed node.
Fixed/Compile nodes are represented by the ModuleNodeInfo type, which
abstracts the common parts of Fixed/Compile nodes with accessor
functions of type `ModuleNodeInfo -> ...`.
Fixed nodes can only depend on other fixed nodes. This invariant can be
checked by the function `checkModuleGraph` or `mkModuleGraphChecked`.
--make mode is modified to work with fixed mode. In order to "compile" a
fixed node, the artifacts are just loaded into the HomePackageTable.
Currently nothing in the compiler will produce Fixed nodes but this is
tested with the FixedNodes GHC API test.
In subsequent patches we are going to remove the ExternalModuleGraph and
use Fixed nodes for modules in the module graph in oneshot mode.
Fixes #25920
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ad64d5c2 by Cheng Shao at 2025-04-12T08:32:19-04:00
ci: remove manual case of ghc-wasm-meta downstream testing jobs
This patch removes the manual case of ghc-wasm-meta downstream testing
jobs; now the only way of including them in the pipeline and running
them is via the test-wasm label.
The reason of the removal is it proves to be problematic for MRs with
only the wasm label; the wasm job would succeed, then the pipeline
status would be waiting for manual action instead of succeeding. There
needs to be separate jobs for the label-triggered and manual-triggered
cases, but I don't think it's worth that extra complexity, the
label-triggered case is already sufficient.
- - - - -
b34890c7 by Vladislav Zavialov at 2025-04-13T01:08:21+03:00
Fix EmptyCase panic in tcMatches (#25960)
Due to faulty reasoning in Note [Pattern types for EmptyCase],
tcMatches was too keen to panic.
* Old (incorrect) assumption: pat_tys is a singleton list.
This does not hold when \case{} is checked against a function type
preceded by invisible forall. See the new T25960 test case.
* New (hopefully correct) assumption: vis_pat_tys is a singleton list.
This should follow from:
checkArgCounts :: MatchGroup GhcRn ... -> TcM VisArity
checkArgCounts (MG { mg_alts = L _ [] })
= return 1
...
- - - - -
84806ebc by Vladislav Zavialov at 2025-04-13T11:40:08-04:00
Remove unused type: TokenLocation
- - - - -
05eb50df by Vladislav Zavialov at 2025-04-13T19:16:38-04:00
Register EpToken in Parser.PostProcess.Haddock (#22558)
This change allows us to reject more badly placed Haddock comments.
Examples:
module
-- | Bad comment for the module
T17544_kw where
data Foo -- | Bad comment for MkFoo
where MkFoo :: Foo
newtype Bar -- | Bad comment for MkBar
where MkBar :: () -> Bar
class Cls a
-- | Bad comment for clsmethod
where
clsmethod :: a
- - - - -
01944e5e by Vladislav Zavialov at 2025-04-13T19:17:21-04:00
Reject puns in T2T (#24153)
This patch implements pun detection in T2T. Consider:
x = 42
f, g :: forall a -> ...
f (type x) = g x
In accordance with the specification, the `g x` function call is renamed
as a term, so `x` refers to the top-level binding `x = 42`, not to the
type variable binding `type x` as one might expect.
This is somewhat counterintuitive because `g` expects a type argument.
Forbidding puns in T2T allows us to produce a helpful error message:
Test.hs:5:16: error: [GHC-09591]
Illegal punned variable occurrence in a required type argument.
The name ‘x’ could refer to:
‘x’ defined at Test.hs:3:1
‘x’ bound at Test.hs:5:9
This commit is a follow up to 0dfb1fa799af254c8a1e1045fc3996af2d57a613
where checking for puns was left as future work.
- - - - -
cc580552 by Vladislav Zavialov at 2025-04-13T19:18:02-04:00
Additional test cases for #12088, #13790
Extract more test cases from ticket discussions, including multi-module
examples. Follow up to 5712e0d646f611dfbfedfd7ef6dff3a18c016edb
- - - - -
d47bf776 by Matthew Pickering at 2025-04-14T16:44:41+01:00
driver: Use ModuleGraph for oneshot and --make mode
This patch uses the `hsc_mod_graph` field for both oneshot and --make
mode. Therefore, if part of the compiler requires usage of the module
graph, you do so in a uniform way for the two different modes.
The `ModuleGraph` describes the relationship between the modules in the
home package and units in external packages. The `ModuleGraph` can be
queried when information about the transitive closure of a package is
needed. For example, the primary use of the ModuleGraph from within the
compiler is in the loader, which needs to know the transitive closure of
a module so it can load all the relevant objects for evaluation.
In --make mode, downsweep computes the ModuleGraph before any
compilation starts.
In oneshot mode, a thunk is created at the start of compilation, which
when forced will compute the module graph beneath the current module.
The thunk is only forced at the moment when the user uses Template
Haskell.
Finally, there are some situations where we need to discover what
dependencies to load but haven't loaded a module graph at all. In this
case, there is a fallback which computes the transitive closure on the
fly and doesn't cache the result. Presumably if you are going to call
getLinkDeps a lot, you would compute the right ModuleGraph before you
started.
Importantly, this removes the ExternalModuleGraph abstraction. This was quite
awkward to work with since it stored information about the home package
inside the EPS.
This patch will also be very useful when implementing explicit level
imports, which requires more significant use of the module graph in
order to determine which level instances are available at.
Towards #25795
-------------------------
Metric Decrease:
MultiLayerModulesTH_Make
MultiLayerModulesTH_OneShot
-------------------------
- - - - -
395e0ad1 by sheaf at 2025-04-16T12:33:26-04:00
base: remove .Internal modules (e.g. GHC.TypeLits)
This commit removes the following internal modules from base,
as per CLC proposal 217:
- GHC.TypeNats.Internal
- GHC.TypeLits.Internal
- GHC.ExecutionStack.Internal
Fixes #25007
- - - - -
e0f3ff11 by Patrick at 2025-04-17T04:31:12-04:00
Refactor Handling of Multiple Default Declarations
Fixes: #25912, #25914, #25934
Previously, GHC discarded all loaded defaults (tcg_default) when local
defaults were encountered during typechecking. According to the
exportable-named-default proposal (sections 2.4.2 and 2.4.3), local
defaults should be merged into tcg_default, retaining any defaults
already present while overriding where necessary.
Key Changes:
* Introduce DefaultProvenance to track the origin of default declarations
(local, imported, or built-in), replacing the original cd_module
in ClassDefaults with cd_provenance :: DefaultProvenance.
* Rename tcDefaults to tcDefaultDecls, limiting its responsibility to only
converting renamed class defaults into ClassDefaults.
* Add extendDefaultEnvWithLocalDefaults to merge local defaults into the
environment, with proper duplication checks:
- Duplicate local defaults for a class trigger an error.
- Local defaults override imported or built-in defaults.
* Update and add related notes: Note [Builtin class defaults],
Note [DefaultProvenance].
* Add regression tests: T25912, T25914, T25934.
Thanks sam and simon for the help on this patch.
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
- - - - -
386f1854 by Teo Camarasu at 2025-04-17T04:31:55-04:00
template-haskell: Remove `addrToByteArrayName` and `addrToByteArray`
These were part of the implementation of the `Lift ByteArray` instance and were errornously exported because this module lacked an explicit export list. They have no usages on Hackage.
Resolves #24782
- - - - -
b96e2f77 by Sylvain Henry at 2025-04-18T20:46:33-04:00
RTS: remove target info and fix host info (#24058)
The RTS isn't a compiler, hence it doesn't have a target and we remove
the reported target info displayed by "+RTS --info". We also fix the
host info displayed by "+RTS --info": the host of the RTS is the
RTS-building compiler's target, not the compiler's host (wrong when
doing cross-compilation).
- - - - -
6d9965f4 by Sylvain Henry at 2025-04-18T20:46:33-04:00
RTS: remove build info
As per the discussion in !13967, there is no reason to tag the RTS with
information about the build platform.
- - - - -
d52e9b3f by Vladislav Zavialov at 2025-04-18T20:47:15-04:00
Diagnostics: remove the KindMismatch constructor (#25957)
The KindMismatch constructor was only used as an intermediate
representation in pretty-printing.
Its removal addresses a problem detected by the "codes" test case:
[GHC-89223] is untested (constructor = KindMismatch)
In a concious deviation from the usual procedure, the error code
GHC-89223 is removed entirely rather than marked as Outdated.
The reason is that it never was user-facing in the first place.
- - - - -
e2f2f9d0 by Vladislav Zavialov at 2025-04-20T10:53:39-04:00
Add name for -Wunusable-unpack-pragmas
This warning had no name or flag and was triggered unconditionally.
Now it is part of -Wdefault.
In GHC.Tc.TyCl.tcTyClGroupsPass's strict mode, we now have to
force-enable this warning to ensure that detection of flawed groups
continues to work even if the user disables the warning with the
-Wno-unusable-unpack-pragmas option. Test case: T3990c
Also, the misnamed BackpackUnpackAbstractType is now called
UnusableUnpackPragma.
- - - - -
6caa6508 by Adam Gundry at 2025-04-20T10:54:22-04:00
Fix specialisation of incoherent instances (fixes #25883)
GHC normally assumes that class constraints are canonical, meaning that
the specialiser is allowed to replace one dictionary argument with another
provided that they have the same type. The `-fno-specialise-incoherents`
flag alters INCOHERENT instance definitions so that they will prevent
specialisation in some cases, by inserting `nospec`.
This commit fixes a bug in 7124e4ad76d98f1fc246ada4fd7bf64413ff2f2e, which
treated some INCOHERENT instance matches as if `-fno-specialise-incoherents`
was in effect, thereby unnecessarily preventing specialisation. In addition
it updates the relevant `Note [Rules for instance lookup]` and adds a new
`Note [Canonicity for incoherent matches]`.
- - - - -
0426fd6c by Adam Gundry at 2025-04-20T10:54:23-04:00
Add regression test for #23429
- - - - -
eec96527 by Adam Gundry at 2025-04-20T10:54:23-04:00
user's guide: update specification of overlapping/incoherent instances
The description of the instance resolution algorithm in the user's
guide was slightly out of date, because it mentioned in-scope given
constraints only at the end, whereas the implementation checks for
their presence before any of the other steps.
This also adds a warning to the user's guide about the impact of
incoherent instances on specialisation, and more clearly documents
some of the other effects of `-XIncoherentInstances`.
- - - - -
a00eeaec by Matthew Craven at 2025-04-20T10:55:03-04:00
Fix bytecode generation for `tagToEnum# <LITERAL>`
Fixes #25975.
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2e204269 by Andreas Klebinger at 2025-04-22T12:20:41+02:00
Simplifier: Constant fold invald tagToEnum# calls to bottom expr.
When applying tagToEnum# to a out-of-range value it's best to simply
constant fold it to a bottom expression. That potentially allows more
dead code elimination and makes debugging easier.
Fixes #25976
- - - - -
7250fc0c by Matthew Pickering at 2025-04-22T16:24:04-04:00
Move -fno-code note into Downsweep module
This note was left behind when all the code which referred to it was
moved into the GHC.Driver.Downsweep module
- - - - -
d2dc89b4 by Matthew Pickering at 2025-04-22T16:24:04-04:00
Apply editing notes to Note [-fno-code mode] suggested by sheaf
These notes were suggested in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14241
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91564daf by Matthew Pickering at 2025-04-24T00:29:02-04:00
ghci: Use loadInterfaceForModule rather than loadSrcInterface in mkTopLevEnv
loadSrcInterface takes a user given `ModuleName` and resolves it to the
module which needs to be loaded (taking into account module
renaming/visibility etc).
loadInterfaceForModule takes a specific module and loads it.
The modules in `ImpDeclSpec` have already been resolved to the actual
module to get the information from during renaming. Therefore we just
need to fetch the precise interface from disk (and not attempt to rename
it again).
Fixes #25951
- - - - -
2e0c07ab by Simon Peyton Jones at 2025-04-24T00:29:43-04:00
Test for #23298
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0eef99b0 by Sven Tennie at 2025-04-24T07:34:36-04:00
RV64: Introduce J instruction (non-local jumps) and don't deallocate stack slots for J_TBL (#25738)
J_TBL result in local jumps, there should not deallocate stack slots
(see Note [extra spill slots].)
J is for non-local jumps, these may need to deallocate stack slots.
- - - - -
1bd3d13e by fendor at 2025-04-24T07:35:17-04:00
Add `UnitId` to `EvalBreakpoint`
The `EvalBreakpoint` is used to communicate that a breakpoint was
encountered during code evaluation.
This `EvalBreakpoint` needs to be converted to an `InternalBreakpointId`
which stores a `Module` to uniquely find the correct `Module` in the
Home Package Table.
The `EvalBreakpoint` used to store only a `ModuleName` which is then
converted to a `Module` based on the currently active home unit.
This is incorrect in the face of multiple home units, the break point
could be in an entirely other home unit!
To fix this, we additionally store the `UnitId` of the `Module` in
`EvalBreakpoint` to later reconstruct the correct `Module`
All of the changes are the consequence of extending `EvalBreakpoint`
with the additional `ShortByteString` of the `UnitId`.
For performance reasons, we store the `ShortByteString` backing the
`UnitId` directly, avoiding marshalling overhead.
- - - - -
fe6ed8d9 by Sylvain Henry at 2025-04-24T18:04:12-04:00
Doc: add doc for JS interruptible calling convention (#24444)
- - - - -
6111c5e4 by Ben Gamari at 2025-04-24T18:04:53-04:00
compiler: Ensure that Panic.Plain.assertPanic' provides callstack
In 36cddd2ce1a3bc62ea8a1307d8bc6006d54109cf @alt-romes removed CallStack
output from `GHC.Utils.Panic.Plain.assertPanic'`. While this output is
redundant due to the exception backtrace proposal, we may be
bootstrapping with a compiler which does not yet include this machinery.
Reintroduce the output for now.
Fixes #25898.
- - - - -
217caad1 by Matthew Pickering at 2025-04-25T18:58:42+01:00
Implement Explicit Level Imports for Template Haskell
This commit introduces the `ExplicitLevelImports` and
`ImplicitStagePersistence` language extensions as proposed in GHC
Proposal #682.
Key Features
------------
- `ExplicitLevelImports` adds two new import modifiers - `splice` and
`quote` - allowing precise control over the level at which imported
identifiers are available
- `ImplicitStagePersistence` (enabled by default) preserves existing
path-based cross-stage persistence behavior
- `NoImplicitStagePersistence` disables implicit cross-stage
persistence, requiring explicit level imports
Benefits
--------
- Improved compilation performance by reducing unnecessary code generation
- Enhanced IDE experience with faster feedback in `-fno-code` mode
- Better dependency tracking by distinguishing compile-time and runtime dependencies
- Foundation for future cross-compilation improvements
This implementation enables the separation of modules needed at
compile-time from those needed at runtime, allowing for more efficient
compilation pipelines and clearer code organization in projects using
Template Haskell.
Implementation Notes
--------------------
The level which a name is availble at is stored in the 'GRE', in the normal
GlobalRdrEnv. The function `greLevels` returns the levels which a specific GRE
is imported at. The level information for a 'Name' is computed by `getCurrentAndBindLevel`.
The level validity is checked by `checkCrossLevelLifting`.
Instances are checked by `checkWellLevelledDFun`, which computes the level an
instance by calling `checkWellLevelledInstanceWhat`, which sees what is
available at by looking at the module graph.
Modifications to downsweep
--------------------------
Code generation is now only enabled for modules which are needed at
compile time.
See the Note [-fno-code mode] for more information.
Uniform error messages for level errors
---------------------------------------
All error messages to do with levels are now reported uniformly using
the `TcRnBadlyStaged` constructor.
Error messages are uniformly reported in terms of levels.
0 - top-level
1 - quote level
-1 - splice level
The only level hard-coded into the compiler is the top-level in
GHC.Types.ThLevelIndex.topLevelIndex.
Uniformly refer to levels and stages
------------------------------------
There was much confusion about levels vs stages in the compiler.
A level is a semantic concept, used by the typechecker to ensure a
program can be evaluated in a well-staged manner.
A stage is an operational construct, program evaluation proceeds in
stages.
Deprecate -Wbadly-staged-types
------------------------------
`-Wbadly-staged-types` is deprecated in favour of `-Wbadly-levelled-types`.
Lift derivation changed
-----------------------
Derived lift instances will now not generate code with expression
quotations.
Before:
```
data A = A Int deriving Lift
=>
lift (A x) = [| A $(lift x) |]
```
After:
```
lift (A x) = conE 'A `appE` (lift x)
```
This is because if you attempt to derive `Lift` in a module where
`NoImplicitStagePersistence` is enabled, you would get an infinite loop
where a constructor was attempted to be persisted using the instance you
are currently defining.
GHC API Changes
---------------
The ModuleGraph now contains additional information about the type of
the edges (normal, quote or splice) between modules. This is abstracted
using the `ModuleGraphEdge` data type.
Fixes #25828
-------------------------
Metric Increase:
MultiLayerModulesTH_Make
-------------------------
- - - - -
7641a74a by Simon Peyton Jones at 2025-04-26T22:05:19-04:00
Get a decent MatchContext for pattern synonym bindings
In particular when we have a pattern binding
K p1 .. pn = rhs
where K is a pattern synonym. (It might be nested.)
This small MR fixes #25995. It's a tiny fix, to an error message,
removing an always-dubious `unkSkol`.
The bug report was in the context of horde-ad, a big program,
and I didn't manage to make a small repro case quickly. I decided
not to bother further.
- - - - -
ce616f49 by Simon Peyton Jones at 2025-04-27T21:10:25+01:00
Fix infelicities in the Specialiser
On the way to #23109 (unary classes) I discovered some infelicities
(or maybe tiny bugs, I forget) in the type-class specialiser.
I also tripped over #25965, an outright bug in the rule matcher
Specifically:
* Refactor: I enhanced `wantCallsFor`, whih previously always said
`True`, to discard calls of class-ops, data constructors etc. This is
a bit more efficient; and it means we don't need to worry about
filtering them out later.
* Fix: I tidied up some tricky logic that eliminated redundant
specialisations. It wasn't working correctly. See the expanded
Note [Specialisations already covered], and
(MP3) in Note [Specialising polymorphic dictionaries].
See also the new top-level `alreadyCovered`
function, which now goes via `GHC.Core.Rules.ruleLhsIsMoreSpecific`
I also added a useful Note [The (CI-KEY) invariant]
* Fix #25965: fixed a tricky bug in the `go_fam_fam` in
`GHC.Core.Unify.uVarOrFam`, which allows matching to succeed
without binding all type varibles.
I enhanced Note [Apartness and type families] some more
* #25703. This ticket "just works" with -fpolymorphic-specialisation;
but I was surprised that it worked! In this MR I added documentation
to Note [Interesting dictionary arguments] to explain; and tests to
ensure it stays fixed.
- - - - -
22d11fa8 by Simon Peyton Jones at 2025-04-28T18:05:19-04:00
Track rewriter sets more accurately in constraint solving
The key change, which fixed #25440, is to call `recordRewriter` in
GHC.Tc.Solver.Rewrite.rewrite_exact_fam_app. This missing call meant
that we were secretly rewriting a Wanted with a Wanted, but not really
noticing; and that led to a very bad error message, as you can see
in the ticket.
But of course that led me into rabbit hole of other refactoring around
the RewriteSet code:
* Improve Notes [Wanteds rewrite Wanteds]
* Zonk the RewriterSet in `zonkCtEvidence` rather than only in GHC.Tc.Errors.
This is tidier anyway (e.g. de-clutters debug output), and helps with the
next point.
* In GHC.Tc.Solver.Equality.inertsCanDischarge, don't replace a constraint
with no rewriters with an equal constraint that has many. See
See (CE4) in Note [Combining equalities]
* Move zonkRewriterSet and friends from GHC.Tc.Zonk.Type into
GHC.Tc.Zonk.TcType, where they properly belong.
A handful of tests get better error messages.
For some reason T24984 gets 12% less compiler allocation -- good
Metric Decrease:
T24984
- - - - -
6467d61e by Brandon Chinn at 2025-04-29T18:36:03-04:00
Fix lexing "\^\" (#25937)
This broke in the refactor in !13128, where the old code parsed escape
codes and collapsed string gaps at the same time, but the new code
collapsed gaps first, then resolved escape codes. The new code used a
naive heuristic to skip escaped backslashes, but didn't account for
"\^\".
- - - - -
99868a86 by Jens Petersen at 2025-04-29T18:36:44-04:00
hadrian: default selftest to disabled
- - - - -
aba2a4a5 by Zubin Duggal at 2025-04-30T06:35:59-04:00
get-win32-tarballs.py: List tarball files to be downloaded if we cannot find them
Fixes #25929
- - - - -
d99a617b by Ben Gamari at 2025-04-30T06:36:40-04:00
Move Data ModuleName instance to Language.Haskell.Syntax.Module.Name
Fixes #25968.
- - - - -
9995c2b7 by Serge S. Gulin at 2025-05-04T17:13:36+03:00
Support for ARM64 Windows (LLVM-enabled) (fixes #24603)
1. Add Windows AArch64 cross-compilation support via CI jobs
Introduce new CI configurations for cross-compiling to Windows ARM64 using Debian12Wine, FEX, and MSYS2.
Configure toolchain variables for LLVM MinGW and Wine emulation in CI pipelines.
2. Adjust compiler and RTS for AArch64 Windows compatibility
Reserve register `x18` on Windows and Darwin platforms in AArch64 codegen.
Handle Windows-specific relocations and data sections in AArch64 assembler.
Update PEi386 linker to recognize ARM64 binaries and support exception handling.
Adjust LLVM target definitions and data layouts for new architectures.
Update `ghc-toolchain` and build scripts to handle `TablesNextToCode` on Windows ARM64.
3. Enhance CI scripts and stability
Modify `ci.sh` to handle mingw cross-targets, fixing GHC executable paths and test execution.
Use `diff -w` in tests to ignore whitespace differences, improving cross-platform consistency.
4. Refactor and clean up code
Remove redundant imports in hello.hs test.
Improve error messages and checks for unsupported configurations in the driver.
Add `EXDEV` error code to `errno.js`.
Add async/sync flags to IO logs at `base.js`.
Improve POSIX compatibility for file close at `base.js`: decrease indeterminism for mixed cases of async and sync code.
5. Update dependencies: `Cabal`, `Win32`, `directory`, `process`, `haskeline`, and `unix`.
submodule
Co-authored-by: Cheng Shao <terrorjack(a)type.dance>
Co-authored-by: Dmitrii Egorov <egorov.d.i(a)icloud.com>
Co-authored-by: Andrei Borzenkov <root(a)sandwitch.dev>
- - - - -
50fa8165 by Javran Cheng at 2025-05-05T05:55:39-04:00
Suppress unused do-binding if discarded variable is Any or ZonkAny.
Consider example (#25895):
> do { forever (return ()); blah }
where `forever :: forall a b. IO a -> IO b`.
Nothing constrains `b`, so it will be instantiates with `Any` or
`ZonkAny`.
But we certainly don't want to complain about a discarded do-binding.
Fixes #25895
- - - - -
e46c6b18 by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00
Refactor mkTopLevImportedEnv out of mkTopLevEnv
This makes the code clearer and allows the top-level import context to
be fetched directly from the HomeModInfo through the API (e.g. useful
for the debugger).
- - - - -
0ce0d263 by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00
Export sizeOccEnv from GHC.Types.Name.Occurrence
Counts the number of OccNames in an OccEnv
- - - - -
165f98d8 by Simon Peyton Jones at 2025-05-06T09:02:39-04:00
Fix a bad untouchability bug im simplifyInfer
This patch addresses #26004. The root cause was that simplifyInfer
was willing to unify variables "far out". The fix, in
runTcSWithEvBinds', is to initialise the inert set given-eq level with
the current level. See
(TGE6) in Note [Tracking Given equalities]
in GHC.Tc.Solver.InertSet
Two loosely related refactors:
* Refactored approximateWCX to return just the free type
variables of the un-quantified constraints. That avoids duplication
of work (these free vars are needed in simplifyInfer) and makes it
clearer that the constraints themselves are irrelevant.
* A little local refactor of TcSMode, which reduces the number of
parameters to runTcSWithEvBinds
- - - - -
6e67fa08 by Ben Gamari at 2025-05-08T06:21:21-04:00
llvmGen: Fix built-in variable predicate
Previously the predicate to identify LLVM builtin global variables was
checking for `$llvm` rather than `@llvm` as it should.
- - - - -
a9d0a22c by Ben Gamari at 2025-05-08T06:21:22-04:00
llvmGen: Fix linkage of built-in arrays
LLVM now insists that built-in arrays use Appending linkage, not
Internal.
Fixes #25769.
- - - - -
9c6d2b1b by sheaf at 2025-05-08T06:22:11-04:00
Use mkTrAppChecked in ds_ev_typeable
This change avoids violating the invariant of mkTrApp according to which
the argument should not be a fully saturated function type.
This ensures we don't return false negatives for type equality
involving function types.
Fixes #25998
- - - - -
75cadf81 by Ryan Hendrickson at 2025-05-08T06:22:55-04:00
haddock: Preserve indentation in multiline examples
Intended for use with :{ :}, but doesn't look for those characters. Any
consecutive lines with birdtracks will only have initial whitespace
stripped up to the column of the first line.
- - - - -
fee9b351 by Cheng Shao at 2025-05-08T06:23:36-04:00
ci: re-enable chrome for wasm ghci browser tests
Currently only firefox is enabled for wasm ghci browser tests, for
some reason testing with chrome works on my machine but gets stuck on
gitlab instance runners. This patch re-enables testing with chrome by
passing `--no-sandbox`, since chrome sandboxing doesn't work in
containers without `--cap-add=SYS_ADMIN`.
- - - - -
282df905 by Vladislav Zavialov at 2025-05-09T03:18:25-04:00
Take subordinate 'type' specifiers into account
This patch fixes multiple bugs (#22581, #25983, #25984, #25991)
in name resolution of subordinate import lists.
Bug #22581
----------
In subordinate import lists, the use of the `type` namespace specifier
used to be ignored. For example, this import statement was incorrectly
accepted:
import Prelude (Bool(type True))
Now it results in an error message:
<interactive>:2:17: error: [GHC-51433]
In the import of ‘Prelude’:
a data type called ‘Bool’ is exported,
but its subordinate item ‘True’ is not in the type namespace.
Bug #25983
----------
In subordinate import lists within a `hiding` clause, non-existent
items led to a poor warning message with -Wdodgy-imports. Consider:
import Prelude hiding (Bool(X))
The warning message for this import statement used to misreport the
cause of the problem:
<interactive>:3:24: warning: [GHC-56449] [-Wdodgy-imports]
In the import of ‘Prelude’:
an item called ‘Bool’ is exported, but it is a type.
Now the warning message is correct:
<interactive>:2:24: warning: [GHC-10237] [-Wdodgy-imports]
In the import of ‘Prelude’:
a data type called ‘Bool’ is exported, but it does not export
any constructors or record fields called ‘X’.
Bug #25984
----------
In subordinate import lists within a `hiding` clause, non-existent
items resulted in the entire import declaration being discarded.
For example, this program was incorrectly accepted:
import Prelude hiding (Bool(True,X))
t = True
Now it results in an error message:
<interactive>:2:5: error: [GHC-88464]
Data constructor not in scope: True
Bug #25991
----------
In subordinate import lists, it was not possible to refer to a class
method if there was an associated type of the same name:
module M_helper where
class C a b where
type a # b
(#) :: a -> b -> ()
module M where
import M_helper (C((#)))
This import declaration failed with:
M.hs:2:28: error: [GHC-10237]
In the import of ‘M_helper’:
an item called ‘C’ is exported, but it does not export any children
(constructors, class methods or field names) called ‘#’.
Now it is accepted.
Summary
-------
The changes required to fix these bugs are almost entirely confined to
GHC.Rename.Names. Other than that, there is a new error constructor
BadImportNonTypeSubordinates with error code [GHC-51433].
Test cases:
T22581a T22581b T22581c T22581d
T25983a T25983b T25983c T25983d T25983e T25983f T25983g
T25984a T25984b
T25991a T25991b1 T25991b2
- - - - -
51b0ce8f by Simon Peyton Jones at 2025-05-09T03:19:07-04:00
Slighty improve `dropMisleading`
Fix #26105, by upgrading the (horrible, hacky) `dropMisleading`
function.
This fix makes things a bit better but does not cure the underlying
problem.
- - - - -
7b2d1e6d by Simon Peyton Jones at 2025-05-11T03:24:47-04:00
Refine `noGivenNewtypeReprEqs` to account for quantified constraints
This little MR fixes #26020. We are on the edge of completeness
for newtype equalities (that doesn't change) but this MR makes GHC
a bit more consistent -- and fixes the bug reported.
- - - - -
eaa8093b by Cheng Shao at 2025-05-11T03:25:28-04:00
wasm: mark freeJSVal as INLINE
This patch marks `freeJSVal` as `INLINE` for the wasm backend. I
noticed that the `freeJSVal` invocations are not inlined when
inspecting STG/Cmm dumps of downstream libraries that use release
build of the wasm backend. The performance benefit of inlining here is
very modest, but so is the cost anyway; if you are using `freeJSVal`
at all then you care about every potential chance to improve
performance :)
- - - - -
eac196df by Cheng Shao at 2025-05-11T03:25:28-04:00
wasm: add zero length fast path for fromJSString
This patch adds a zero length fast path for `fromJSString`; when
marshaling a zero-length `JSString` we don't need to allocate an empty
`ByteArray#` at all.
- - - - -
652cba7e by Peng Fan at 2025-05-14T04:24:35-04:00
Add LoongArch NCG support
Not supported before.
- - - - -
c01f4374 by Lin Runze at 2025-05-14T04:24:35-04:00
ci: Add LoongArch64 cross-compile CI for testing
- - - - -
ce6cf240 by Ben Gamari at 2025-05-14T04:25:18-04:00
rts/linker: Don't fail due to RTLD_NOW
In !12264 we started using the NativeObj machinery introduced some time
ago for loading of shared objects. One of the side-effects of this
change is shared objects are now loaded eagerly (i.e. with `RTLD_NOW`).
This is needed by NativeObj to ensure full visibility of the mappings of
the loaded object, which is in turn needed for safe shared object
unloading.
Unfortunately, this change subtly regressed, causing compilation
failures in some programs. Specifically, shared objects which refer to
undefined symbols (e.g. which may be usually provided by either the
executable image or libraries loaded via `dlopen`) will fail to load
with eager binding. This is problematic as GHC loads all package
dependencies while, e.g., evaluating TemplateHaskell splices. This
results in compilation failures in programs depending upon (but not
using at compile-time) packages with undefined symbol references.
To mitigate this NativeObj now first attempts to load an object via
eager binding, reverting to lazy binding (and disabling unloading) on
failure.
See Note [Don't fail due to RTLD_NOW].
Fixes #25943.
- - - - -
88ee8bb5 by Sylvain Henry at 2025-05-14T04:26:15-04:00
Deprecate GHC.JS.Prim.Internal.Build (#23432)
Deprecated as per CLC proposal 329 (https://github.com/haskell/core-libraries-committee/issues/329)
- - - - -
b4ed465b by Cheng Shao at 2025-05-14T04:26:57-04:00
libffi: update to 3.4.8
Bumps libffi submodule.
- - - - -
a3e71296 by Matthew Pickering at 2025-05-14T04:27:38-04:00
Remove leftover trace
- - - - -
2d0ecdc6 by Cheng Shao at 2025-05-14T04:28:19-04:00
Revert "ci: re-enable chrome for wasm ghci browser tests"
This reverts commit fee9b351fa5a35d5778d1252789eacaaf5663ae8.
Unfortunately the chrome test jobs may still timeout on certain
runners (e.g. OpenCape) for unknown reasons.
- - - - -
3b3a5dec by Ben Gamari at 2025-05-15T16:10:01-04:00
Don't emit unprintable characters when printing Uniques
When faced with an unprintable tag we now instead print the codepoint
number.
Fixes #25989.
(cherry picked from commit e832b1fadee66e8d6dd7b019368974756f8f8c46)
- - - - -
e1ef8974 by Mike Pilgrem at 2025-05-16T16:09:14-04:00
Translate iff in Haddock documentation into everyday English
- - - - -
fd64667d by Vladislav Zavialov at 2025-05-20T03:25:08-04:00
Allow the 'data' keyword in import/export lists (#25899)
This patch introduces the 'data' namespace specifier in import and
export lists. The intended use is to import data constructors without
their parent type constructors, e.g.
import Data.Proxy as D (data Proxy)
type DP = D.Proxy -- promoted data constructor
Additionally, it is possible to use 'data' to explicitly qualify any
data constructors or terms, incl. operators and field selectors
import Prelude (Semigroup(data (<>)))
import Data.Function (data (&))
import Data.Monoid (data Dual, data getDual)
x = Dual "Hello" <> Dual "World" & getDual
The implementation mostly builds on top of the existing logic for the
'type' and 'pattern' namespace specifiers, plus there are a few tweaks
to how we generate suggestions in error messages.
- - - - -
acc86753 by Ben Gamari at 2025-05-20T03:25:51-04:00
compiler: Use field selectors when creating BCOs
This makes it easier to grep for these fields.
- - - - -
60a55fd7 by Ben Gamari at 2025-05-20T03:25:51-04:00
compiler: Clarify BCO size
Previously the semantics and size of StgBCO was a bit unclear.
Specifically, the `size` field was documented to contain the size of the
bitmap whereas it was actually the size of the closure *and* bitmap.
Additionally, it was not as clear as it could be that the bitmap was a
full StgLargeBitmap with its own `size` field.
- - - - -
ac9fb269 by Simon Peyton Jones at 2025-05-20T09:19:04-04:00
Track rewriter sets more accurately in constraint solving
This MR addresses #26003, by refactoring the arcane
intricacies of Note [Equalities with incompatible kinds].
NB: now retitled to
Note [Equalities with heterogeneous kinds].
and the main Note for this MR.
In particular:
* Abandon invariant (COERCION-HOLE) in Note [Unification preconditions] in
GHC.Tc.Utils.Unify.
* Abandon invariant (TyEq:CH)) in Note [Canonical equalities] in
GHC.Tc.Types.Constraint.
* Instead: add invariant (REWRITERS) to Note [Unification preconditions]:
unify only if the constraint has an empty rewriter set.
Implementation:
* In canEqCanLHSFinish_try_unification, skip trying unification if there is a
non-empty rewriter set.
* To do this, make sure the rewriter set is zonked; do so in selectNextWorkItem,
which also deals with prioritisation.
* When a coercion hole is filled, kick out inert equalities that have that hole
as a rewriter. It might now be unlocked and available to unify.
* Remove the ad-hoc `ch_hetero_kind` field of `CoercionHole`.
* In `selectNextWorkItem`, priorities equalities withan empty rewriter set.
* Defaulting: see (DE6) in Note [Defaulting equalities]
and Note [Limited defaulting in the ambiguity check]
* Concreteness checks: there is some extra faff to try to get decent
error messages when the FRR (representation-polymorphism) checks
fail. In partiular, add a "When unifying..." explanation when the
representation-polymorphism check arose from another constraint.
- - - - -
86406f48 by Cheng Shao at 2025-05-20T09:19:47-04:00
rts: fix rts_clearMemory logic when sanity checks are enabled
This commit fixes an RTS assertion failure when invoking
rts_clearMemory with +RTS -DS. -DS implies -DZ which asserts that free
blocks contain 0xaa as the designated garbage value. Also adds the
sanity way to rts_clearMemory test to prevent future regression.
Closes #26011.
ChatGPT Codex automatically diagnosed the issue and proposed the
initial patch in a single shot, given a GHC checkout and the following
prompt:
---
Someone is reporting the following error when attempting to use `rts_clearMemory` with the RTS option `-DS`:
```
test.wasm: internal error: ASSERTION FAILED: file rts/sm/Storage.c, line 1216
(GHC version 9.12.2.20250327 for wasm32_unknown_wasi)
Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug
```
What's the culprit? How do I look into this issue?
---
I manually reviewed & revised the patch, tested and submitted it.
- - - - -
7147370b by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: do not allocate strings in bytecode assembler
This patch refactors the compiler to avoid allocating iserv buffers
for BCONPtrStr at assemble-time. Now BCONPtrStr ByteStrings are
recorded as a part of CompiledByteCode, and actual allocation only
happens at link-time. This refactoring is necessary for adding
bytecode serialization functionality, as explained by the revised
comments in this commit.
- - - - -
a67db612 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: make bc_strs serializable
This commit makes the bc_strs field in CompiledByteCode serializable;
similar to previous commit, we preserve the ByteString directly and
defer the actual allocation to link-time, as mentioned in updated
comment.
- - - - -
5faf34ef by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: make bc_itbls serializable
This commit makes bc_itbls in CompiledByteCode serializable. A
dedicated ConInfoTable datatype has been added in ghci which is the
recipe for dynamically making a datacon's info table, containing the
payload of the MkConInfoTable iserv message.
- - - - -
2abaf8c1 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: remove FFIInfo bookkeeping in BCO
This commit removes the bc_ffis field from CompiledByteCode
completely, as well as all the related bookkeeping logic in
GHC.StgToByteCode. bc_ffis is actually *unused* in the rest of GHC
codebase! It is merely a list of FFIInfo, which is just a remote
pointer of the libffi ffi_cif struct; once we allocate the ffi_cif
struct and put its pointer in a CCALL instruction, we'll never free it
anyway. So there is no point of bookkeeping.
- - - - -
adb9e4d2 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: make FFIInfo serializable in BCO
This commit makes all the FFIInfo needed in CCALL instructions
serializable. Previously, when doing STG to BCO lowering, we would
allocate a libffi ffi_cif struct and keep its remote pointer as
FFIInfo; but actually we can just keep the type signature as FFIInfo
and defer the actual allocation to link-time.
- - - - -
200f401b by Cheng Shao at 2025-05-20T17:22:19-04:00
ghci: remove redundant NewBreakModule message
This commit removes the redundant NewBreakModule message from ghci: it
just allocates two strings! This functionality can be implemented with
existing MallocStrings in one iserv call.
- - - - -
ddaadca6 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: make breakpoint module name and unit id serializable
This commit makes breakpoint module name and unit id serializable, in
BRK_FUN instructions as well as ModBreaks. We can simply keep the
module name and unit ids, and defer the buffer allocation to link
time.
- - - - -
a0fde202 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: remove unused newModule
This commit removes the now unused newModule function from GHC.
- - - - -
68c8f140 by Cheng Shao at 2025-05-20T17:22:19-04:00
compiler: add BCONPtrFS for interned top level string literals in BCO
This commit adds BCONPtrFS as a BCO non-pointer literal kind, which
has the same semantics of BCONPtrStr, except it contains a FastString
instead of a ByteString. By using BCONPtrFS to represent top level
string literals that are already FastString in the compilation
pipeline, we enjoy the FastString interning logic and avoid allocating
a bunch of redundant ByteStrings for the same FastStrings, especially
when we lower the BRK_FUN instruction.
- - - - -
f2b532bc by Peng Fan at 2025-05-20T17:23:15-04:00
hadrian: enable GHCi for loongarch64
- - - - -
8ded2330 by kwxm at 2025-05-20T17:24:07-04:00
Fix bugs in `integerRecipMod` and `integerPowMod`
This fixes #26017.
* `integerRecipMod x 1` now returns `(# 1 | #)` for all x; previously it
incorrectly returned `(# | () #)`, indicating failure.
* `integerPowMod 0 e m` now returns `(# | () #)` for e<0 and m>1, indicating
failure; previously it incorrectly returned `(# 0 | #)`.
- - - - -
c9abb87c by Andreas Klebinger at 2025-05-20T17:24:50-04:00
Specialise: Don't float out constraint components.
It was fairly complex to do so and it doesn't seem to improve anything.
Nofib allocations were unaffected as well.
See also Historical Note [Floating dictionaries out of cases]
- - - - -
202b201c by Andreas Klebinger at 2025-05-21T10:16:14-04:00
Interpreter: Add limited support for direct primop evaluation.
This commit adds support for a number of primops directly
to the interpreter. This avoids the indirection of going
through the primop wrapper for those primops speeding interpretation
of optimized code up massively.
Code involving IntSet runs about 25% faster with optimized core and these
changes. For core without breakpoints it's even more pronouced and I
saw reductions in runtime by up to 50%.
Running GHC itself in the interpreter was sped up by ~15% through this
change.
Additionally this comment does a few other related changes:
testsuite:
* Run foundation test in ghci and ghci-opt ways to test these
primops.
* Vastly expand the foundation test to cover all basic primops
by comparing result with the result of calling the wrapper.
Interpreter:
* When pushing arguments for interpreted primops extend each argument to
at least word with when pushing. This avoids some issues with big
endian. We can revisit this if it causes performance issues.
* Restructure the stack chunk check logic. There are now macros for
read accesses which might cross stack chunk boundries and macros which
omit the checks which are used when we statically know we access an
address in the current stack chunk.
- - - - -
67a177b4 by sheaf at 2025-05-21T10:17:04-04:00
QuickLook: do a shape test before unifying
This commit ensures we do a shape test before unifying. This ensures
we don't try to unify a TyVarTv with a non-tyvar, e.g.
alpha[tyv] := Int
On the way, we refactor simpleUnifyCheck:
1. Move the checkTopShape check into simpleUnifyCheck
2. Refactors simpleUnifyCheck to return a value of the new type
SimpleUnifyResult type. Now, simpleUnifyCheck returns "can unify",
"cannot unify" or "dunno" (with "cannot unify" being the new result
it can return). Now:
- touchabilityTest is included; it it fails we return "cannot unify"
- checkTopShape now returns "cannot unify" instead of "dunno" upon failure
3. Move the call to simpleUnifyCheck out of checkTouchableTyVarEq.
After that, checkTouchableTyVarEq becames a simple call to
checkTyEqRhs, so we inline it.
This allows the logic in canEqCanLHSFinish_try_unification to be simplified.
In particular, we now avoid calling 'checkTopShape' twice.
Two further changes suggested by Simon were also implemented:
- In canEqCanLHSFinish, if checkTyEqRhs returns PuFail with
'do_not_prevent_rewriting', we now **continue with this constraint**.
This allows us to use the constraint for rewriting.
- checkTyEqRhs now has a top-level check to avoid flattening a tyfam app
in a top-level equality of the form alpha ~ F tys, as this is
going around in circles. This simplifies the implementation without
any change in behaviour.
Fixes #25950
Fixes #26030
- - - - -
4020972c by sheaf at 2025-05-21T10:17:04-04:00
FixedRuntimeRepError: omit unhelpful explanation
This commit tweaks the FixedRuntimeRepError case of pprTcSolverReportMsg,
to avoid including an explanation which refers to a type variable that
appears nowhere else.
For example, the old error message could look like the following:
The pattern binding does not have a fixed runtime representation.
Its type is:
T :: TYPE R
Cannot unify ‘R’ with the type variable ‘c0’
because the former is not a concrete ‘RuntimeRep’.
With this commit, we now omit the last two lines, because the concrete
type variable (here 'c0') does not appear in the type displayed to the
user (here 'T :: TYPE R').
- - - - -
6d058a69 by Andrea Bedini at 2025-05-21T16:00:51-04:00
Don't fail when ghcversion.h can't be found (#26018)
If ghcversion.h can't be found, don't try to include it. This happens
when there is no rts package in the package db and when -ghcversion-file
argument isn't passed.
Co-authored-by: Syvlain Henry <sylvain(a)haskus.fr>
- - - - -
b1212fbf by Vladislav Zavialov at 2025-05-21T16:01:33-04:00
Implement -Wpattern-namespace-specifier (#25900)
In accordance with GHC Proposal #581 "Namespace-specified imports",
section 2.3 "Deprecate use of pattern in import/export lists", the
`pattern` namespace specifier is now deprecated.
Test cases: T25900 T25900_noext
- - - - -
e650ec3e by Ben Gamari at 2025-05-23T03:42:46-04:00
base: Forward port changelog language from 9.12
- - - - -
94cd9ca4 by Ben Gamari at 2025-05-23T03:42:46-04:00
base: Fix RestructuredText-isms in changelog
- - - - -
7722232c by Ben Gamari at 2025-05-23T03:42:46-04:00
base: Note strictness changes made in 4.16.0.0
Addresses #25886.
- - - - -
3f4b823c by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker: Factor out ProddableBlocks machinery
- - - - -
6e23fef2 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker: Improve efficiency of proddable blocks structure
Previously the linker's "proddable blocks" check relied on a simple
linked list of spans. This resulted in extremely poor complexity while
linking objects with lots of small sections (e.g. objects built with
split sections).
Rework the mechanism to instead use a simple interval set implemented
via binary search.
Fixes #26009.
- - - - -
ea74860c by Ben Gamari at 2025-05-23T03:43:28-04:00
testsuite: Add simple functional test for ProddableBlockSet
- - - - -
74c4db46 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker/PEi386: Drop check for LOAD_LIBRARY_SEARCH_*_DIRS
The `LOAD_LIBRARY_SEARCH_USER_DIRS` and
`LOAD_LIBRARY_SEARCH_DEFAULT_DIRS` were introduced in Windows Vista and
have been available every since. As we no longer support Windows XP we
can drop this check.
Addresses #26009.
- - - - -
972d81d6 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker/PEi386: Clean up code style
- - - - -
8a1073a5 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/Hash: Factor out hashBuffer
This is a useful helper which can be used for non-strings as well.
- - - - -
44f509f2 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker/PEi386: Fix incorrect use of break in nested for
Previously the happy path of PEi386 used `break` in a double-`for` loop
resulting in redundant calls to `LoadLibraryEx`.
Fixes #26052.
- - - - -
bfb12783 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts: Correctly mark const arguments
- - - - -
08469ff8 by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker/PEi386: Don't repeatedly load DLLs
Previously every DLL-imported symbol would result in a call to
`LoadLibraryEx`. This ended up constituting over 40% of the runtime of
`ghc --interactive -e 42` on Windows. Avoid this by maintaining a
hash-set of loaded DLL names, skipping the call if we have already
loaded the requested DLL.
Addresses #26009.
- - - - -
823d1ccf by Ben Gamari at 2025-05-23T03:43:28-04:00
rts/linker: Expand comment describing ProddableBlockSet
- - - - -
e9de9e0b by Sylvain Henry at 2025-05-23T15:12:34-04:00
Remove emptyModBreaks
Remove emptyModBreaks and track the absence of ModBreaks with `Maybe
ModBreaks`. It avoids testing for null pointers...
- - - - -
17db44c5 by Ben Gamari at 2025-05-23T15:13:16-04:00
base: Expose Backtraces constructor and fields
This was specified in the proposal (CLC #199) yet somehow didn't make it
into the implementation.
Fixes #26049.
- - - - -
b08c08ae by soulomoon at 2025-05-28T01:57:23+08:00
Refactor handling of imported COMPLETE pragmas
from the HPT
Previously, we imported COMPLETE pragmas from all modules in the Home
Package Table (HPT) during type checking. However, since !13675, there
may be non-below modules in the HPT from the dependency tree that we do
not want to import COMPLETE pragmas from. This refactor changes the way
we handle COMPLETE pragmas from the HPT to only import them from modules
that are "below" the current module in the HPT.
- Add hugCompleteSigsBelow to filter COMPLETE pragmas from "below"
modules in the HPT, mirroring hugRulesBelow.
- Move responsibility for calling hugCompleteSigsBelow to tcRnImports,
storing the result in the new tcg_complete_match_env field of TcGblEnv.
- Update getCompleteMatchesTcM to use tcg_complete_match_env.
This refactor only affects how COMPLETE pragmas are imported from the
HPT, imports from external packages are unchanged.
- - - - -
16014bf8 by Hécate Kleidukos at 2025-05-28T20:09:34-04:00
Expose all of Backtraces' internals for ghc-internal
Closes #26049
- - - - -
a0adc30d by Ryan Hendrickson at 2025-05-30T14:12:52-04:00
haddock: Fix links to type operators
- - - - -
7b64697c by Mario Blažević at 2025-05-30T14:13:41-04:00
Introduce parenBreakableList and use it in ppHsContext
- - - - -
5f213bff by fendor at 2025-06-02T09:16:24+02:00
Make GHCi commands compatible with multiple home units
=== Design
We enable all GHCi features that were previously guarded by the `inMulti`
option.
GHCi supported multiple home units up to a certain degree for quite a while now.
The supported feature set was limited, due to a design impasse:
One of the home units must be "active", e.g., there must be one `HomeUnit`
whose `UnitId` is "active" which is returned when calling
```haskell
do
hscActiveUnitId <$> getSession
```
This makes sense in a GHC session, since you are always compiling a particular
Module, but it makes less intuitive sense in an interactive session.
Given an expression to evaluate, we can't easily tell in which "context" the expression
should be parsed, typechecked and evaluated.
That's why initially, most of GHCi features, except for `:reload`ing were disabled
if the GHCi session had more than one `HomeUnitEnv`.
We lift this restriction, enabling all features of GHCi for the multiple home unit case.
To do this, we fundamentally change the `HomeUnitEnv` graph to be multiple home unit first.
Instead of differentiating the case were we have a single home unit and multiple,
we now always set up a multiple home unit session that scales seamlessly to an arbitrary
amount of home units.
We introduce two new `HomeUnitEnv`s that are always added to the `HomeUnitGraph`.
They are:
The "interactive-ghci", called the `interactiveGhciUnit`, contains the same
`DynFlags` that are used by the `InteractiveContext` for interactive evaluation
of expressions.
This `HomeUnitEnv` is only used on the prompt of GHCi, so we may refer to it as
"interactive-prompt" unit.
See Note [Relation between the `InteractiveContext` and `interactiveGhciUnitId`]
for discussing its role.
And the "interactive-session"", called `interactiveSessionUnit` or
`interactiveSessionUnitId`, which is used for loading Scripts into
GHCi that are not `Target`s of any home unit, via `:load` or `:add`.
Both of these "interactive" home units depend on all other `HomeUnitEnv`s that
are passed as arguments on the cli.
Additionally, the "interactive-ghci" unit depends on `interactive-session`.
We always evaluate expressions in the context of the
"interactive-ghci" session.
Since "interactive-ghci" depends on all home units, we can import any `Module`
from the other home units with ease.
As we have a clear `HomeUnitGraph` hierarchy, we can set `interactiveGhciUnitId`
as the active home unit for the full duration of the GHCi session.
In GHCi, we always set `interactiveGhciUnitId` to be the currently active home unit.
=== Implementation Details
Given this design idea, the implementation is relatively straight
forward.
The core insight is that a `ModuleName` is not sufficient to identify a
`Module` in the `HomeUnitGraph`. Thus, large parts of the PR is simply
about refactoring usages of `ModuleName` to prefer `Module`, which has a
`Unit` attached and is unique over the `HomeUnitGraph`.
Consequentially, most usages of `lookupHPT` are likely to be incorrect and have
been replaced by `lookupHugByModule` which is keyed by a `Module`.
In `GHCi/UI.hs`, we make sure there is only one location where we are
actually translating `ModuleName` to a `Module`:
* `lookupQualifiedModuleName`
If a `ModuleName` is ambiguous, we detect this and report it to the
user.
To avoid repeated lookups of `ModuleName`s, we store the `Module` in the
`InteractiveImport`, which additionally simplifies the interface
loading.
A subtle detail is that the `DynFlags` of the `InteractiveContext` are
now stored both in the `HomeUnitGraph` and in the `InteractiveContext`.
In UI.hs, there are multiple code paths where we are careful to update
the `DynFlags` in both locations.
Most importantly in `addToProgramDynFlags`.
---
There is one metric increase in this commit:
-------------------------
Metric Increase:
T4029
-------------------------
It is an increase from 14.4 MB to 16.1 MB (+11.8%) which sounds like a
pretty big regression at first.
However, we argue this increase is solely caused by using more data
structures for managing multiple home units in the GHCi session.
In particular, due to the design decision of using three home units, the
base memory usage increases... but by how much?
A big contributor is the `UnitState`, of which we have three now, which
on its own 260 KB per instance. That makes an additional memory usage of
520 KB, already explaining a third of the overall memory usage increase.
Then we store more elements in the `HomeUnitGraph`, we have more
`HomeUnitEnv` entries, etc...
While we didn't chase down each byte, we looked at the memory usage over time
for both `-hi` and `-hT` profiles and can say with confidence while the memory
usage increased slightly, we did not introduce any space leak, as
the graph looks almost identical as the memory usage graph of GHC HEAD.
---
Adds testcases for GHCi multiple home units session
* Test truly multiple home unit sessions, testing reload logic and code evaluation.
* Test that GHCi commands such as `:all-types`, `:browse`, etc., work
* Object code reloading for home modules
* GHCi debugger multiple home units session
- - - - -
de603d01 by fendor at 2025-06-02T09:16:24+02:00
Update "loading compiled code" GHCi documentation
To use object code in GHCi, the module needs to be compiled for use in
GHCi. To do that, users need to compile their modules with:
* `-dynamic`
* `-this-unit-id interactive-session`
Otherwise, the interface files will not match.
- - - - -
b255a8ca by Vladislav Zavialov at 2025-06-02T16:00:12-04:00
docs: Fix code example for NoListTuplePuns
Without the fix, the example produces an error:
Test.hs:11:3: error: [GHC-45219]
• Data constructor ‘Tuple’ returns type ‘Tuple2 a b’
instead of an instance of its parent type ‘Tuple a’
• In the definition of data constructor ‘Tuple’
In the data type declaration for ‘Tuple’
Fortunately, a one line change makes it compile.
- - - - -
6558467c by Ryan Hendrickson at 2025-06-06T05:46:58-04:00
haddock: Parse math even after ordinary characters
Fixes a bug where math sections were not recognized if preceded by a
character that isn't special (like space or a markup character).
- - - - -
265d0024 by ARATA Mizuki at 2025-06-06T05:47:48-04:00
AArch64 NCG: Fix sub-word arithmetic right shift
As noted in Note [Signed arithmetic on AArch64], we should zero-extend sub-word values.
Fixes #26061
- - - - -
05e9be18 by Simon Hengel at 2025-06-06T05:48:35-04:00
Allow Unicode in "message" and "hints" with -fdiagnostics-as-json
(fixes #26075)
- - - - -
bfa6b70f by ARATA Mizuki at 2025-06-06T05:49:24-04:00
x86 NCG: Fix code generation of bswap64 on i386
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
Fix #25601
- - - - -
35826d8b by Matthew Pickering at 2025-06-08T22:00:41+01:00
Hadrian: Add option to generate .hie files for stage1 libraries
The +hie_files flavour transformer can be enabled to produce hie files
for stage1 libraries. The hie files are produced in the
"extra-compilation-artifacts" folder and copied into the resulting
bindist.
At the moment the hie files are not produced for the release flavour,
they add about 170M to the final bindist.
Towards #16901
- - - - -
e2467dbd by Ryan Hendrickson at 2025-06-09T13:07:05-04:00
Fix various failures to -fprint-unicode-syntax
- - - - -
1d99d3e4 by maralorn at 2025-06-12T03:47:39-04:00
Add necessary flag for js linking
- - - - -
974d5734 by maralorn at 2025-06-12T03:47:39-04:00
Don’t use additional linker flags to detect presence of -fno-pie in configure.ac
This mirrors the behavior of ghc-toolchain
- - - - -
1e9eb118 by Andrew Lelechenko at 2025-06-12T03:48:21-04:00
Add HasCallStack to Control.Monad.Fail.fail
CLC proposal https://github.com/haskell/core-libraries-committee/issues/327
2% compile-time allocations increase in T3064, likely because `fail`
is now marginally more expensive to compile.
Metric Increase:
T3064
- - - - -
6d12060f by meooow25 at 2025-06-12T14:26:07-04:00
Bump containers submodule to 0.8
Also
* Disable -Wunused-imports for containers
* Allow containers-0.8 for in-tree packages
* Bump some submodules so that they allow containers-0.8. These are not
at any particular versions.
* Remove unused deps containers and split from ucd2haskell
* Fix tests affected by the new containers and hpc-bin
- - - - -
537bd233 by Peng Fan at 2025-06-12T14:27:02-04:00
NCG/LA64: Optimize code generation and reduce build-directory size.
1. makeFarBranches: Prioritize fewer instruction sequences.
2. Prefer instructions with immediate numbers to reduce register moves,
e.g. andi,ori,xori,addi.
3. Ppr: Remove unnecessary judgments.
4. genJump: Avoid "ld+jr" as much as possible.
5. BCOND and BCOND1: Implement conditional jumps with two jump ranges,
with limited choice of the shortest.
6. Implement FSQRT, CLT, CTZ.
7. Remove unnecessary code.
- - - - -
19f20861 by Simon Peyton Jones at 2025-06-13T09:51:11-04:00
Improve redundant constraints for instance decls
Addresses #25992, which showed that the default methods
of an instance decl could make GHC fail to report redundant
constraints.
Figuring out how to do this led me to refactor the computation
of redundant constraints. See the entirely rewritten
Note [Tracking redundant constraints]
in GHC.Tc.Solver.Solve
- - - - -
1d02798e by Matthew Pickering at 2025-06-13T09:51:54-04:00
Refactor the treatment of nested Template Haskell splices
* The difference between a normal splice, a quasiquoter and implicit
splice caused by lifting is stored in the AST after renaming.
* Information that the renamer learns about splices is stored in the
relevant splice extension points (XUntypedSpliceExpr, XQuasiQuote).
* Normal splices and quasi quotes record the flavour of splice
(exp/pat/dec etc)
* Implicit lifting stores information about why the lift was attempted,
so if it fails, that can be reported to the user.
* After renaming, the decision taken to attempt to implicitly lift a
variable is stored in the `XXUntypedSplice` extension field in the
`HsImplicitLiftSplice` constructor.
* Since all the information is stored in the AST, in `HsUntypedSplice`,
the type of `PendingRnSplice` now just stores a `HsUntypedSplice`.
* Error messages since the original program can be easily
printed, this is noticeable in the case of implicit lifting.
* The user-written syntax is directly type-checked. Before, some
desugaring took place in the
* Fixes .hie files to work better with nested splices (nested splices
are not indexed)
* The location of the quoter in a quasiquote is now located, so error
messages will precisely point to it (and again, it is indexed by hie
files)
In the future, the typechecked AST should also retain information about
the splices and the specific desugaring being left to the desugarer.
Also, `runRnSplice` should call `tcUntypedSplice`, otherwise the
typechecking logic is duplicated (see the `QQError` and `QQTopError`
tests for a difference caused by this).
- - - - -
f93798ba by Cheng Shao at 2025-06-13T09:52:35-04:00
libffi: update to 3.5.1
Bumps libffi submodule.
- - - - -
c7aa0c10 by Andreas Klebinger at 2025-06-15T05:47:24-04:00
Revert "Specialise: Don't float out constraint components."
This reverts commit c9abb87ccc0c91cd94f42b3e36270158398326ef.
Turns out two benchmarks from #19747 regresses by a factor of 7-8x if
we do not float those out.
- - - - -
fd998679 by Krzysztof Gogolewski at 2025-06-15T05:48:06-04:00
Fix EPT enforcement when mixing unboxed tuples and non-tuples
The code was assuming that an alternative cannot be returning a normal
datacon and an unboxed tuple at the same time. However, as seen in #26107,
this can happen when using a GADT to refine the representation type.
The solution is just to conservatively return TagDunno.
- - - - -
7048ed2e by Ben Gamari at 2025-06-17T10:56:43+01:00
configure: Don't force value of OTOOL, etc. if not present
Previously if `otool` and `install_name_tool` were not present they
would be overridden by `fp_settings.m4`. This logic was introduced in
4ff93292243888545da452ea4d4c1987f2343591 without explanation.
- - - - -
317bf5cd by Ben Gamari at 2025-06-17T10:56:43+01:00
ghc-toolchain: Add support for otool, install_name_tool
Fixes part of ghc#23675.
- - - - -
0587802e by Ben Gamari at 2025-06-17T11:10:27+01:00
ghc-toolchain: Add support for llc, opt, llvm-as
Fixes #23675.
- - - - -
1528 changed files:
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/hello.hs
- .gitlab/jobs.yaml
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- .gitlab/rel_eng/upload.sh
- compiler/CodeGen.Platform.h
- compiler/GHC.hs
- compiler/GHC/Builtin/Names.hs
- compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps/Ids.hs
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/ByteCode/InfoTable.hs
- compiler/GHC/ByteCode/Instr.hs
- compiler/GHC/ByteCode/Linker.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Cmm/CLabel.hs
- compiler/GHC/Cmm/Dataflow/Label.hs
- compiler/GHC/Cmm/Lint.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Type.hs
- compiler/GHC/CmmToAsm.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/Config.hs
- compiler/GHC/CmmToAsm/Dwarf/Constants.hs
- + compiler/GHC/CmmToAsm/LA64.hs
- + compiler/GHC/CmmToAsm/LA64/CodeGen.hs
- + compiler/GHC/CmmToAsm/LA64/Cond.hs
- + compiler/GHC/CmmToAsm/LA64/Instr.hs
- + compiler/GHC/CmmToAsm/LA64/Ppr.hs
- + compiler/GHC/CmmToAsm/LA64/RegInfo.hs
- + compiler/GHC/CmmToAsm/LA64/Regs.hs
- compiler/GHC/CmmToAsm/PIC.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/RV64/CodeGen.hs
- compiler/GHC/CmmToAsm/RV64/Instr.hs
- compiler/GHC/CmmToAsm/RV64/Ppr.hs
- compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
- compiler/GHC/CmmToAsm/Reg/Linear.hs
- compiler/GHC/CmmToAsm/Reg/Linear/AArch64.hs
- compiler/GHC/CmmToAsm/Reg/Linear/FreeRegs.hs
- + compiler/GHC/CmmToAsm/Reg/Linear/LA64.hs
- compiler/GHC/CmmToAsm/Reg/Target.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToAsm/X86/Ppr.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm/Base.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/CmmToLlvm/Data.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion/Axiom.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/InstEnv.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Map/Expr.hs
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Opt/CSE.hs
- compiler/GHC/Core/Opt/ConstantFold.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/Predicate.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/Rules/Config.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/Tidy.hs
- compiler/GHC/Core/TyCo/Compare.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/TyCo/Tidy.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Type.hs-boot
- compiler/GHC/Core/Unify.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/Graph/Directed/Reachability.hs
- compiler/GHC/Data/Strict.hs
- compiler/GHC/Data/TrieMap.hs
- compiler/GHC/Driver/Backend.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/Config.hs
- compiler/GHC/Driver/Config/CmmToAsm.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- + compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.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/Main.hs
- compiler/GHC/Driver/Make.hs
- + compiler/GHC/Driver/MakeAction.hs
- compiler/GHC/Driver/MakeFile.hs
- + compiler/GHC/Driver/Messager.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline.hs-boot
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Session.hs
- + compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Expr.hs-boot
- compiler/GHC/Hs/Extension.hs
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Stats.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Breakpoints.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/Call.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Monad.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/Decl.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Flags.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Recomp/Binary.hs
- compiler/GHC/Iface/Recomp/Flags.hs
- compiler/GHC/Iface/Recomp/Types.hs
- compiler/GHC/Iface/Rename.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/IfaceToCore.hs-boot
- compiler/GHC/Linker/Deps.hs
- compiler/GHC/Linker/Loader.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/Header.hs
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Parser/String.hs
- compiler/GHC/Platform.hs
- compiler/GHC/Platform/LoongArch64.hs → compiler/GHC/Platform/LA64.hs
- compiler/GHC/Platform/Regs.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/Fixity.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Rename/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Context.hs
- compiler/GHC/Runtime/Debugger.hs
- + compiler/GHC/Runtime/Debugger/Breakpoints.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Eval/Types.hs
- + compiler/GHC/Runtime/Eval/Utils.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Interpreter/Wasm.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Settings/IO.hs
- compiler/GHC/Stg/CSE.hs
- compiler/GHC/Stg/EnforceEpt/Types.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm/Config.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToJS/Linker/Linker.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/GHC/SysTools/Process.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Pat.hs
- − compiler/GHC/Tc/Gen/Rule.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Gen/Splice.hs-boot
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Plugin.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/Equality.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Irred.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/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/Constraint.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/TH.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/Concrete.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/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Validity.hs
- compiler/GHC/Tc/Zonk/Env.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Annotations.hs
- compiler/GHC/Types/Avail.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/Breakpoint.hs
- compiler/GHC/Types/CostCentre.hs
- compiler/GHC/Types/CostCentre/State.hs
- compiler/GHC/Types/DefaultEnv.hs
- compiler/GHC/Types/Error.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/GREInfo.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/Literal.hs
- compiler/GHC/Types/Name.hs
- compiler/GHC/Types/Name/Occurrence.hs
- compiler/GHC/Types/Name/Ppr.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/SourceFile.hs
- compiler/GHC/Types/SrcLoc.hs
- + compiler/GHC/Types/ThLevelIndex.hs
- compiler/GHC/Types/TyThing/Ppr.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Types/Var/Env.hs
- compiler/GHC/Unit/Env.hs
- compiler/GHC/Unit/External.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Home/Graph.hs
- compiler/GHC/Unit/Home/PackageTable.hs
- compiler/GHC/Unit/Module/Deps.hs
- − compiler/GHC/Unit/Module/External/Graph.hs
- compiler/GHC/Unit/Module/Graph.hs
- compiler/GHC/Unit/Module/Imported.hs
- compiler/GHC/Unit/Module/ModDetails.hs
- compiler/GHC/Unit/Module/ModIface.hs
- compiler/GHC/Unit/Module/ModNodeKey.hs
- compiler/GHC/Unit/Module/ModSummary.hs
- + compiler/GHC/Unit/Module/Stage.hs
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Logger.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/GHC/Utils/Panic.hs
- compiler/GHC/Utils/Panic/Plain.hs
- compiler/Language/Haskell/Syntax/Basic.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/ImpExp.hs
- + compiler/Language/Haskell/Syntax/ImpExp/IsBoot.hs
- compiler/Language/Haskell/Syntax/Module/Name.hs
- compiler/Language/Haskell/Syntax/Type.hs
- compiler/Language/Haskell/Syntax/Type.hs-boot
- compiler/ghc.cabal.in
- configure.ac
- docs/users_guide/9.14.1-notes.rst
- docs/users_guide/expected-undocumented-flags.txt
- docs/users_guide/exts/control.rst
- docs/users_guide/exts/data_kinds.rst
- docs/users_guide/exts/explicit_namespaces.rst
- docs/users_guide/exts/ffi.rst
- docs/users_guide/exts/instances.rst
- docs/users_guide/exts/linear_types.rst
- docs/users_guide/exts/monad_comprehensions.rst
- docs/users_guide/exts/named_defaults.rst
- docs/users_guide/exts/parallel_list_comprehensions.rst
- docs/users_guide/exts/pattern_synonyms.rst
- docs/users_guide/exts/pragmas.rst
- docs/users_guide/exts/template_haskell.rst
- docs/users_guide/ghci.rst
- docs/users_guide/javascript.rst
- docs/users_guide/phases.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/wasm.rst
- + ghc/GHC/Driver/Session/Lint.hs
- + ghc/GHC/Driver/Session/Mode.hs
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Exception.hs
- ghc/GHCi/UI/Info.hs
- ghc/GHCi/UI/Monad.hs
- ghc/Main.hs
- ghc/ghc-bin.cabal.in
- hadrian/README.md
- hadrian/bindist/config.mk.in
- hadrian/cfg/default.host.target.in
- hadrian/cfg/default.target.in
- hadrian/cfg/system.config.in
- hadrian/doc/flavours.md
- hadrian/doc/user-settings.md
- hadrian/hadrian.cabal
- hadrian/src/CommandLine.hs
- hadrian/src/Context.hs
- hadrian/src/Context/Path.hs
- hadrian/src/Flavour.hs
- hadrian/src/Flavour/Type.hs
- hadrian/src/Hadrian/Haskell/Hash.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cabal.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/RunTest.hs
- hadrian/src/Settings/Default.hs
- hadrian/src/Settings/Flavours/Release.hs
- hadrian/src/Settings/Packages.hs
- hadrian/src/Settings/Warnings.hs
- libffi-tarballs
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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 4 commits: Revert "Specialise: Don't float out constraint components."
by Marge Bot (＠marge-bot) 17 Jun '25
by Marge Bot (＠marge-bot) 17 Jun '25
17 Jun '25
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
c7aa0c10 by Andreas Klebinger at 2025-06-15T05:47:24-04:00
Revert "Specialise: Don't float out constraint components."
This reverts commit c9abb87ccc0c91cd94f42b3e36270158398326ef.
Turns out two benchmarks from #19747 regresses by a factor of 7-8x if
we do not float those out.
- - - - -
fd998679 by Krzysztof Gogolewski at 2025-06-15T05:48:06-04:00
Fix EPT enforcement when mixing unboxed tuples and non-tuples
The code was assuming that an alternative cannot be returning a normal
datacon and an unboxed tuple at the same time. However, as seen in #26107,
this can happen when using a GADT to refine the representation type.
The solution is just to conservatively return TagDunno.
- - - - -
d9fb83b5 by Matthew Pickering at 2025-06-16T17:17:13+01:00
Improve error messages when implicit lifting fails
This patch concerns programs which automatically try to fix level errors
by inserting `Lift`. For example:
```
foo x = [| x |]
~>
foo x = [| $(lift x) |]
```
Before, there were two problems with the message.
1. (#26031), the location of the error was reported as the whole
quotation.
2. (#26035), the message just mentions there is no Lift instance, but
gives no indicate why the user program needed a Lift instance in the
first place.
This problem is especially bad when you disable
`ImplicitStagePersistence`, so you just end up with a confusing "No
instance for" message rather than an error message about levels
This patch fixes both these issues.
Firstly, `PendingRnSplice` differentiates between a user-written splice
and an implicit lift. Then, the Lift instance is precisely requested
with a specific origin in the typechecker. If the instance fails to be
solved, the message is reported using the `TcRnBadlyLevelled`
constructor (like a normal level error).
Fixes #26031, #26035
- - - - -
6c833f3e by Lauren Yim at 2025-06-17T05:43:22-04:00
fix some typos in the warnings page in the user guide
- - - - -
47 changed files:
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Stg/EnforceEpt/Types.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Types/Origin.hs
- docs/users_guide/using-warnings.rst
- testsuite/tests/annotations/should_fail/annfail03.stderr
- testsuite/tests/annotations/should_fail/annfail09.stderr
- testsuite/tests/quasiquotation/qq001/qq001.stderr
- testsuite/tests/quasiquotation/qq002/qq002.stderr
- testsuite/tests/quasiquotation/qq003/qq003.stderr
- testsuite/tests/quasiquotation/qq004/qq004.stderr
- + testsuite/tests/quotes/LiftErrMsg.hs
- + testsuite/tests/quotes/LiftErrMsg.stderr
- + testsuite/tests/quotes/LiftErrMsgDefer.hs
- + testsuite/tests/quotes/LiftErrMsgDefer.stderr
- + testsuite/tests/quotes/LiftErrMsgTyped.hs
- + testsuite/tests/quotes/LiftErrMsgTyped.stderr
- testsuite/tests/quotes/T10384.stderr
- testsuite/tests/quotes/TH_localname.stderr
- testsuite/tests/quotes/all.T
- + testsuite/tests/rep-poly/T26107.hs
- testsuite/tests/rep-poly/all.T
- testsuite/tests/splice-imports/SI03.stderr
- testsuite/tests/splice-imports/SI05.stderr
- testsuite/tests/splice-imports/SI16.stderr
- testsuite/tests/splice-imports/SI18.stderr
- testsuite/tests/splice-imports/SI20.stderr
- testsuite/tests/splice-imports/SI25.stderr
- testsuite/tests/splice-imports/SI28.stderr
- testsuite/tests/splice-imports/SI31.stderr
- testsuite/tests/th/T16976z.stderr
- testsuite/tests/th/T17820a.stderr
- testsuite/tests/th/T17820b.stderr
- testsuite/tests/th/T17820c.stderr
- testsuite/tests/th/T17820d.stderr
- testsuite/tests/th/T17820e.stderr
- testsuite/tests/th/T23829_hasty.stderr
- testsuite/tests/th/T23829_hasty_b.stderr
- testsuite/tests/th/T5795.stderr
The diff was not included because it is too large.
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17 Jun '25
Rodrigo Mesquita pushed new branch wip/romes/25956 at Glasgow Haskell Compiler / GHC
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17 Jun '25
Rodrigo Mesquita pushed new branch wip/romes/26039 at Glasgow Haskell Compiler / GHC
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[Git][ghc/ghc][wip/romes/26058] base: Export displayExceptionWithInfo
by Rodrigo Mesquita (＠alt-romes) 17 Jun '25
by Rodrigo Mesquita (＠alt-romes) 17 Jun '25
17 Jun '25
Rodrigo Mesquita pushed to branch wip/romes/26058 at Glasgow Haskell Compiler / GHC
Commits:
7d6de41d by Rodrigo Mesquita at 2025-06-17T09:27:40+01:00
base: Export displayExceptionWithInfo
This function should be exposed from base; follows from CLC#285
Fixes #26058
- - - - -
2 changed files:
- libraries/base/src/Control/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
Changes:
=====================================
libraries/base/src/Control/Exception.hs
=====================================
@@ -116,7 +116,9 @@ module Control.Exception
bracket_,
bracketOnError,
finally,
- onException
+ onException,
+ -- ** Printing
+ displayExceptionWithInfo
) where
=====================================
libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
=====================================
@@ -246,7 +246,7 @@ instance Exception SomeException where
-- * The exception context
--
-- By default, 'uncaughtExceptionHandler' uses 'displayExceptionWithInfo' to print uncaught exceptions.
--- This default can be overriden with 'setUncaughtExceptionHandler', for
+-- This default can be overridden with 'setUncaughtExceptionHandler', for
-- instance, to present custom error messages on exceptions to the user.
--
-- @since base-4.21
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17 Jun '25
Rodrigo Mesquita pushed new branch wip/romes/26058 at Glasgow Haskell Compiler / GHC
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Simon Peyton Jones pushed to branch wip/T26115 at Glasgow Haskell Compiler / GHC
Commits:
c4159435 by Simon Peyton Jones at 2025-06-16T23:45:25+01:00
More wibbles
Keep inert_solved
- - - - -
3 changed files:
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Monad.hs
Changes:
=====================================
compiler/GHC/Tc/Solver/Dict.hs
=====================================
@@ -767,93 +767,21 @@ tryShortCutSolver try_short_cut dict_w@(DictCt { di_ev = ev_w })
-- Enabled by the -fsolve-constant-dicts flag
-> tryTcS $ -- tryTcS tries to completely solve some contraints
- do { updInertSet zapInertSet -- Remove all Givens, solved dicts etc
+ do { updInertSet zap_cans
; solveSimpleWanteds (unitBag (CDictCan dict_w)) }
| otherwise
-> return False }
-{-
- = do { ev_binds_var <- getTcEvBindsVar
- ; ev_binds <- assertPpr (not (isCoEvBindsVar ev_binds_var )) (ppr ev_w) $
- getTcEvBindsMap ev_binds_var
- ; solved_dicts <- getSolvedDicts
-
- ; mb_stuff <- runMaybeT $
- try_solve_from_instance (ev_binds, solved_dicts) wanted
-
- ; case mb_stuff of
- Nothing -> return False
- Just (ev_binds', solved_dicts')
- -> do { setTcEvBindsMap ev_binds_var ev_binds'
- ; setSolvedDicts solved_dicts'
- ; return True } }
-
- | otherwise
- = return False
where
- -- This `CtLoc` is used only to check the well-staged condition of any
- -- candidate DFun. Our subgoals all have the same stage as our root
- -- [W] constraint so it is safe to use this while solving them.
- loc_w = ctEvLoc ev_w
-
- try_solve_from_instance -- See Note [Shortcut try_solve_from_instance]
- :: (EvBindMap, DictMap DictCt) -> WantedCtEvidence
- -> MaybeT TcS (EvBindMap, DictMap DictCt)
- try_solve_from_instance (ev_binds, solved_dicts) wtd@(WantedCt { ctev_loc = loc, ctev_pred = pred })
- | ClassPred cls tys <- classifyPredType pred
- = do { inst_res <- lift $ matchGlobalInst dflags True cls tys loc_w
- ; lift $ warn_custom_warn_instance inst_res loc_w
- -- See Note [Implementation of deprecated instances]
- ; case inst_res of
- OneInst { cir_new_theta = preds
- , cir_mk_ev = mk_ev
- , cir_canonical = canonical
- , cir_what = what }
- | safeOverlap what
- , all isTyFamFree preds -- Note [Shortcut solving: type families]
- -> do { let dict_ct = DictCt { di_ev = CtWanted wtd, di_cls = cls
- , di_tys = tys, di_pend_sc = doNotExpand }
- solved_dicts' = addSolvedDict dict_ct solved_dicts
- -- solved_dicts': it is important that we add our goal
- -- to the cache before we solve! Otherwise we may end
- -- up in a loop while solving recursive dictionaries.
-
- ; lift $ traceTcS "shortCutSolver: found instance" (ppr preds)
- ; loc' <- lift $ checkInstanceOK loc what pred
- ; lift $ checkReductionDepth loc' pred
-
-
- ; evc_vs <- mapM (new_wanted_cached wtd loc' solved_dicts') preds
- -- Emit work for subgoals but use our local cache
- -- so we can solve recursive dictionaries.
-
- ; let ev_tm = mk_ev (map getEvExpr evc_vs)
- ev_binds' = extendEvBinds ev_binds $
- mkWantedEvBind (wantedCtEvEvId wtd) canonical ev_tm
-
- ; foldlM try_solve_from_instance (ev_binds', solved_dicts') $
- freshGoals evc_vs }
-
- _ -> mzero }
+ zap_cans :: InertSet -> InertSet
+ -- Zap the inert Givens (so we don't try to use them for solving)
+ -- and any inert Wanteds (no harm but not much benefit either.
+ -- But preserve the current solved_dicts, so that one invocation of
+ -- tryShortCutSolver can benefit from the work of earlier invocations
+ zap_cans inerts@(IS { inert_cans = cans })
+ = inerts { inert_cans = emptyInertCans (inert_given_eq_lvl cans) }
- | otherwise
- = mzero
-
-
- -- Use a local cache of solved dicts while emitting EvVars for new work
- -- We bail out of the entire computation if we need to emit an EvVar for
- -- a subgoal that isn't a ClassPred.
- new_wanted_cached :: WantedCtEvidence -> CtLoc
- -> DictMap DictCt -> TcPredType -> MaybeT TcS MaybeNew
- new_wanted_cached (WantedCt { ctev_rewriters = rws }) loc cache pty
- | ClassPred cls tys <- classifyPredType pty
- = lift $ case findDict cache loc_w cls tys of
- Just dict_ct -> return $ Cached (ctEvExpr (dictCtEvidence dict_ct))
- Nothing -> Fresh <$> newWantedNC loc rws pty
- | otherwise = mzero
-
--}
{- *******************************************************************
* *
=====================================
compiler/GHC/Tc/Solver/InertSet.hs
=====================================
@@ -17,7 +17,7 @@ module GHC.Tc.Solver.InertSet (
-- * The inert set
InertSet(..),
InertCans(..),
- emptyInertSet, zapInertSet,
+ emptyInertSet, emptyInertCans,
noGivenNewtypeReprEqs, updGivenEqs,
prohibitedSuperClassSolve,
@@ -405,10 +405,6 @@ emptyInertSet given_eq_lvl
, inert_solved_dicts = emptyDictMap
, inert_safehask = emptyDictMap }
-zapInertSet :: InertSet -> InertSet
-zapInertSet (IS { inert_cans = cans })
- = emptyInertSet (inert_given_eq_lvl cans)
-
{- Note [Solved dictionaries]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When we apply a top-level instance declaration, we add the "solved"
=====================================
compiler/GHC/Tc/Solver/Monad.hs
=====================================
@@ -1360,7 +1360,9 @@ tryTcS (TcS thing_inside)
, tcs_inerts = new_inert_var
, tcs_worklist = new_wl_var }
+ ; TcM.traceTc "tryTcS {" (ppr old_inerts)
; wc <- thing_inside nest_env
+ ; TcM.traceTc "tryTcS }" (ppr wc)
; if not (isSolvedWC wc)
then return False
@@ -1373,6 +1375,8 @@ tryTcS (TcS thing_inside)
; new_inerts <- TcM.readTcRef new_inert_var
; TcM.updTcRef inerts_var (`updateInertsWith` new_inerts)
+ ; TcM.traceTc "tryTcS update" (ppr (inert_solved_dicts new_inerts))
+
-- We **must not** drop solved implications, due
-- to Note [Free vars of EvFun] in GHC.Tc.Types.Evidence;
-- so we re-emit them here.
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