ghc-6.10.2: The GHC APIContentsIndex
GHC
Contents
Initialisation
GHC Monad
Flags and settings
Targets
Extending the program scope
Loading/compiling the program
Parsing Haddock comments
Inspecting the module structure of the program
Inspecting modules
Querying the environment
Printing
Interactive evaluation
Abstract syntax elements
Packages
Modules
Names
Identifiers
Type constructors
Type variables
Data constructors
Classes
Instances
Types and Kinds
Entities
Syntax
Fixities
Source locations
Located
Constructing Located
Deconstructing Located
Combining and comparing Located values
Exceptions
Token stream manipulations
Miscellaneous
Synopsis
defaultErrorHandler :: (ExceptionMonad m, MonadIO m) => DynFlags -> m a -> m a
defaultCleanupHandler :: (ExceptionMonad m, MonadIO m) => DynFlags -> m a -> m a
data Ghc a
data GhcT m a
class (Functor m, MonadIO m, WarnLogMonad m, ExceptionMonad m) => GhcMonad m where
getSession :: m HscEnv
setSession :: HscEnv -> m ()
runGhc :: Maybe FilePath -> Ghc a -> IO a
runGhcT :: (ExceptionMonad m, Functor m, MonadIO m) => Maybe FilePath -> GhcT m a -> m a
initGhcMonad :: GhcMonad m => Maybe FilePath -> m ()
gcatch :: (ExceptionMonad m, Exception e) => m a -> (e -> m a) -> m a
gbracket :: ExceptionMonad m => m a -> (a -> m b) -> (a -> m c) -> m c
gfinally :: ExceptionMonad m => m a -> m b -> m a
clearWarnings :: WarnLogMonad m => m ()
getWarnings :: WarnLogMonad m => m WarningMessages
hasWarnings :: WarnLogMonad m => m Bool
printExceptionAndWarnings :: GhcMonad m => SourceError -> m ()
printWarnings :: GhcMonad m => m ()
handleSourceError :: ExceptionMonad m => (SourceError -> m a) -> m a -> m a
data DynFlags = DynFlags {
ghcMode :: GhcMode
ghcLink :: GhcLink
coreToDo :: Maybe [CoreToDo]
stgToDo :: Maybe [StgToDo]
hscTarget :: HscTarget
hscOutName :: String
extCoreName :: String
verbosity :: Int
optLevel :: Int
simplPhases :: Int
maxSimplIterations :: Int
shouldDumpSimplPhase :: SimplifierMode -> Bool
ruleCheck :: Maybe String
specConstrThreshold :: Maybe Int
specConstrCount :: Maybe Int
liberateCaseThreshold :: Maybe Int
stolen_x86_regs :: Int
cmdlineHcIncludes :: [String]
importPaths :: [FilePath]
mainModIs :: Module
mainFunIs :: Maybe String
ctxtStkDepth :: Int
dphBackend :: DPHBackend
thisPackage :: PackageId
wayNames :: [WayName]
buildTag :: String
rtsBuildTag :: String
objectDir :: Maybe String
hiDir :: Maybe String
stubDir :: Maybe String
objectSuf :: String
hcSuf :: String
hiSuf :: String
outputFile :: Maybe String
outputHi :: Maybe String
dynLibLoader :: DynLibLoader
dumpPrefix :: Maybe FilePath
dumpPrefixForce :: Maybe FilePath
includePaths :: [String]
libraryPaths :: [String]
frameworkPaths :: [String]
cmdlineFrameworks :: [String]
tmpDir :: String
ghcUsagePath :: FilePath
ghciUsagePath :: FilePath
hpcDir :: String
opt_L :: [String]
opt_P :: [String]
opt_F :: [String]
opt_c :: [String]
opt_m :: [String]
opt_a :: [String]
opt_l :: [String]
opt_windres :: [String]
pgm_L :: String
pgm_P :: (String, [Option])
pgm_F :: String
pgm_c :: (String, [Option])
pgm_m :: (String, [Option])
pgm_s :: (String, [Option])
pgm_a :: (String, [Option])
pgm_l :: (String, [Option])
pgm_dll :: (String, [Option])
pgm_T :: String
pgm_sysman :: String
pgm_windres :: String
depMakefile :: FilePath
depIncludePkgDeps :: Bool
depExcludeMods :: [ModuleName]
depSuffixes :: [String]
extraPkgConfs :: [FilePath]
topDir :: FilePath
systemPackageConfig :: FilePath
packageFlags :: [PackageFlag]
pkgDatabase :: Maybe (UniqFM PackageConfig)
pkgState :: PackageState
flags :: [DynFlag]
log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO ()
haddockOptions :: Maybe String
}
data DynFlag
= Opt_D_dump_cmm
| Opt_D_dump_cmmz
| Opt_D_dump_cmmz_pretty
| Opt_D_dump_cps_cmm
| Opt_D_dump_cvt_cmm
| Opt_D_dump_asm
| Opt_D_dump_asm_native
| Opt_D_dump_asm_liveness
| Opt_D_dump_asm_coalesce
| Opt_D_dump_asm_regalloc
| Opt_D_dump_asm_regalloc_stages
| Opt_D_dump_asm_conflicts
| Opt_D_dump_asm_stats
| Opt_D_dump_cpranal
| Opt_D_dump_deriv
| Opt_D_dump_ds
| Opt_D_dump_flatC
| Opt_D_dump_foreign
| Opt_D_dump_inlinings
| Opt_D_dump_rule_firings
| Opt_D_dump_occur_anal
| Opt_D_dump_parsed
| Opt_D_dump_rn
| Opt_D_dump_simpl
| Opt_D_dump_simpl_iterations
| Opt_D_dump_simpl_phases
| Opt_D_dump_spec
| Opt_D_dump_prep
| Opt_D_dump_stg
| Opt_D_dump_stranal
| Opt_D_dump_tc
| Opt_D_dump_types
| Opt_D_dump_rules
| Opt_D_dump_cse
| Opt_D_dump_worker_wrapper
| Opt_D_dump_rn_trace
| Opt_D_dump_rn_stats
| Opt_D_dump_opt_cmm
| Opt_D_dump_simpl_stats
| Opt_D_dump_tc_trace
| Opt_D_dump_if_trace
| Opt_D_dump_splices
| Opt_D_dump_BCOs
| Opt_D_dump_vect
| Opt_D_dump_hpc
| Opt_D_dump_rtti
| Opt_D_source_stats
| Opt_D_verbose_core2core
| Opt_D_verbose_stg2stg
| Opt_D_dump_hi
| Opt_D_dump_hi_diffs
| Opt_D_dump_minimal_imports
| Opt_D_dump_mod_cycles
| Opt_D_dump_view_pattern_commoning
| Opt_D_faststring_stats
| Opt_DumpToFile
| Opt_D_no_debug_output
| Opt_DoCoreLinting
| Opt_DoStgLinting
| Opt_DoCmmLinting
| Opt_DoAsmLinting
| Opt_WarnIsError
| Opt_WarnDuplicateExports
| Opt_WarnHiShadows
| Opt_WarnImplicitPrelude
| Opt_WarnIncompletePatterns
| Opt_WarnIncompletePatternsRecUpd
| Opt_WarnMissingFields
| Opt_WarnMissingMethods
| Opt_WarnMissingSigs
| Opt_WarnNameShadowing
| Opt_WarnOverlappingPatterns
| Opt_WarnSimplePatterns
| Opt_WarnTypeDefaults
| Opt_WarnMonomorphism
| Opt_WarnUnusedBinds
| Opt_WarnUnusedImports
| Opt_WarnUnusedMatches
| Opt_WarnWarningsDeprecations
| Opt_WarnDeprecatedFlags
| Opt_WarnDodgyImports
| Opt_WarnOrphans
| Opt_WarnTabs
| Opt_WarnUnrecognisedPragmas
| Opt_WarnDodgyForeignImports
| Opt_OverlappingInstances
| Opt_UndecidableInstances
| Opt_IncoherentInstances
| Opt_MonomorphismRestriction
| Opt_MonoPatBinds
| Opt_ExtendedDefaultRules
| Opt_ForeignFunctionInterface
| Opt_UnliftedFFITypes
| Opt_PArr
| Opt_Arrows
| Opt_TemplateHaskell
| Opt_QuasiQuotes
| Opt_ImplicitParams
| Opt_Generics
| Opt_ImplicitPrelude
| Opt_ScopedTypeVariables
| Opt_UnboxedTuples
| Opt_BangPatterns
| Opt_TypeFamilies
| Opt_OverloadedStrings
| Opt_DisambiguateRecordFields
| Opt_RecordWildCards
| Opt_RecordPuns
| Opt_ViewPatterns
| Opt_GADTs
| Opt_RelaxedPolyRec
| Opt_StandaloneDeriving
| Opt_DeriveDataTypeable
| Opt_TypeSynonymInstances
| Opt_FlexibleContexts
| Opt_FlexibleInstances
| Opt_ConstrainedClassMethods
| Opt_MultiParamTypeClasses
| Opt_FunctionalDependencies
| Opt_UnicodeSyntax
| Opt_PolymorphicComponents
| Opt_ExistentialQuantification
| Opt_MagicHash
| Opt_EmptyDataDecls
| Opt_KindSignatures
| Opt_ParallelListComp
| Opt_TransformListComp
| Opt_GeneralizedNewtypeDeriving
| Opt_RecursiveDo
| Opt_PostfixOperators
| Opt_PatternGuards
| Opt_LiberalTypeSynonyms
| Opt_Rank2Types
| Opt_RankNTypes
| Opt_ImpredicativeTypes
| Opt_TypeOperators
| Opt_PackageImports
| Opt_NewQualifiedOperators
| Opt_PrintExplicitForalls
| Opt_Strictness
| Opt_FullLaziness
| Opt_StaticArgumentTransformation
| Opt_CSE
| Opt_LiberateCase
| Opt_SpecConstr
| Opt_IgnoreInterfacePragmas
| Opt_OmitInterfacePragmas
| Opt_DoLambdaEtaExpansion
| Opt_IgnoreAsserts
| Opt_DoEtaReduction
| Opt_CaseMerge
| Opt_UnboxStrictFields
| Opt_MethodSharing
| Opt_DictsCheap
| Opt_InlineIfEnoughArgs
| Opt_EnableRewriteRules
| Opt_Vectorise
| Opt_RegsGraph
| Opt_RegsIterative
| Opt_Cpp
| Opt_Pp
| Opt_ForceRecomp
| Opt_DryRun
| Opt_DoAsmMangling
| Opt_ExcessPrecision
| Opt_ReadUserPackageConf
| Opt_NoHsMain
| Opt_SplitObjs
| Opt_StgStats
| Opt_HideAllPackages
| Opt_PrintBindResult
| Opt_Haddock
| Opt_HaddockOptions
| Opt_Hpc_No_Auto
| Opt_BreakOnException
| Opt_BreakOnError
| Opt_PrintEvldWithShow
| Opt_PrintBindContents
| Opt_GenManifest
| Opt_EmbedManifest
| Opt_RunCPSZ
| Opt_ConvertToZipCfgAndBack
| Opt_AutoLinkPackages
| Opt_ImplicitImportQualified
| Opt_KeepHiDiffs
| Opt_KeepHcFiles
| Opt_KeepSFiles
| Opt_KeepRawSFiles
| Opt_KeepTmpFiles
| Opt_KeepRawTokenStream
data Severity
= SevInfo
| SevWarning
| SevError
| SevFatal
data HscTarget
= HscC
| HscAsm
| HscJava
| HscInterpreted
| HscNothing
dopt :: DynFlag -> DynFlags -> Bool
data GhcMode
= CompManager
| OneShot
| MkDepend
data GhcLink
= NoLink
| LinkBinary
| LinkInMemory
| LinkDynLib
defaultObjectTarget :: HscTarget
parseDynamicFlags :: Monad m => DynFlags -> [Located String] -> m (DynFlags, [Located String], [Located String])
getSessionDynFlags :: GhcMonad m => m DynFlags
setSessionDynFlags :: GhcMonad m => DynFlags -> m [PackageId]
parseStaticFlags :: [Located String] -> IO ([Located String], [Located String])
data Target = Target {
targetId :: TargetId
targetAllowObjCode :: Bool
targetContents :: Maybe (StringBuffer, ClockTime)
}
data TargetId
= TargetModule ModuleName
| TargetFile FilePath (Maybe Phase)
data Phase
setTargets :: GhcMonad m => [Target] -> m ()
getTargets :: GhcMonad m => m [Target]
addTarget :: GhcMonad m => Target -> m ()
removeTarget :: GhcMonad m => TargetId -> m ()
guessTarget :: GhcMonad m => String -> Maybe Phase -> m Target
extendGlobalRdrScope :: GhcMonad m => [GlobalRdrElt] -> m ()
setGlobalRdrScope :: GhcMonad m => [GlobalRdrElt] -> m ()
extendGlobalTypeScope :: GhcMonad m => [Id] -> m ()
setGlobalTypeScope :: GhcMonad m => [Id] -> m ()
depanal :: GhcMonad m => [ModuleName] -> Bool -> m ModuleGraph
load :: GhcMonad m => LoadHowMuch -> m SuccessFlag
loadWithLogger :: GhcMonad m => WarnErrLogger -> LoadHowMuch -> m SuccessFlag
data LoadHowMuch
= LoadAllTargets
| LoadUpTo ModuleName
| LoadDependenciesOf ModuleName
data SuccessFlag
= Succeeded
| Failed
defaultWarnErrLogger :: WarnErrLogger
type WarnErrLogger = GhcMonad m => Maybe SourceError -> m ()
workingDirectoryChanged :: GhcMonad m => m ()
parseModule :: GhcMonad m => ModSummary -> m ParsedModule
typecheckModule :: GhcMonad m => ParsedModule -> m TypecheckedModule
desugarModule :: GhcMonad m => TypecheckedModule -> m DesugaredModule
loadModule :: (TypecheckedMod mod, GhcMonad m) => mod -> m mod
data ParsedModule
data TypecheckedModule
data DesugaredModule
type TypecheckedSource = LHsBinds Id
type ParsedSource = Located (HsModule RdrName)
type RenamedSource = (HsGroup Name, [LImportDecl Name], Maybe [LIE Name], Maybe (HsDoc Name), HaddockModInfo Name)
class ParsedMod m => TypecheckedMod m where
renamedSource :: m -> Maybe RenamedSource
typecheckedSource :: m -> TypecheckedSource
moduleInfo :: m -> ModuleInfo
class ParsedMod m where
parsedSource :: m -> ParsedSource
coreModule :: DesugaredMod m => m -> ModGuts
compileToCoreModule :: GhcMonad m => FilePath -> m CoreModule
compileToCoreSimplified :: GhcMonad m => FilePath -> m CoreModule
compileCoreToObj :: GhcMonad m => Bool -> CoreModule -> m ()
getModSummary :: GhcMonad m => ModuleName -> m ModSummary
parseHaddockComment :: String -> Either String (HsDoc RdrName)
type ModuleGraph = [ModSummary]
data ModSummary = ModSummary {
ms_mod :: Module
ms_hsc_src :: HscSource
ms_location :: ModLocation
ms_hs_date :: ClockTime
ms_obj_date :: Maybe ClockTime
ms_srcimps :: [Located ModuleName]
ms_imps :: [Located ModuleName]
ms_hspp_file :: FilePath
ms_hspp_opts :: DynFlags
ms_hspp_buf :: Maybe StringBuffer
}
ms_mod_name :: ModSummary -> ModuleName
data ModLocation = ModLocation {
ml_hs_file :: Maybe FilePath
ml_hi_file :: FilePath
ml_obj_file :: FilePath
}
getModuleGraph :: GhcMonad m => m ModuleGraph
isLoaded :: GhcMonad m => ModuleName -> m Bool
topSortModuleGraph :: Bool -> [ModSummary] -> Maybe ModuleName -> [SCC ModSummary]
data ModuleInfo
getModuleInfo :: GhcMonad m => Module -> m (Maybe ModuleInfo)
modInfoTyThings :: ModuleInfo -> [TyThing]
modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
modInfoExports :: ModuleInfo -> [Name]
modInfoInstances :: ModuleInfo -> [Instance]
modInfoIsExportedName :: ModuleInfo -> Name -> Bool
modInfoLookupName :: GhcMonad m => ModuleInfo -> Name -> m (Maybe TyThing)
lookupGlobalName :: GhcMonad m => Name -> m (Maybe TyThing)
mkPrintUnqualifiedForModule :: GhcMonad m => ModuleInfo -> m (Maybe PrintUnqualified)
packageDbModules :: GhcMonad m => Bool -> m [Module]
type PrintUnqualified = (QueryQualifyName, QueryQualifyModule)
alwaysQualify :: PrintUnqualified
getBindings :: GhcMonad m => m [TyThing]
getPrintUnqual :: GhcMonad m => m PrintUnqualified
findModule :: GhcMonad m => ModuleName -> Maybe FastString -> m Module
setContext :: GhcMonad m => [Module] -> [Module] -> m ()
getContext :: GhcMonad m => m ([Module], [Module])
getNamesInScope :: GhcMonad m => m [Name]
getRdrNamesInScope :: GhcMonad m => m [RdrName]
getGRE :: GhcMonad m => m GlobalRdrEnv
moduleIsInterpreted :: GhcMonad m => Module -> m Bool
getInfo :: GhcMonad m => Name -> m (Maybe (TyThing, Fixity, [Instance]))
exprType :: GhcMonad m => String -> m Type
typeKind :: GhcMonad m => String -> m Kind
parseName :: GhcMonad m => String -> m [Name]
data RunResult
= RunOk [Name]
| RunFailed
| RunException SomeException
| RunBreak ThreadId [Name] (Maybe BreakInfo)
runStmt :: GhcMonad m => String -> SingleStep -> m RunResult
data SingleStep
= RunToCompletion
| SingleStep
| RunAndLogSteps
resume :: GhcMonad m => (SrcSpan -> Bool) -> SingleStep -> m RunResult
data Resume
data History
getHistorySpan :: GhcMonad m => History -> m SrcSpan
getHistoryModule :: History -> Module
getResumeContext :: GhcMonad m => m [Resume]
abandon :: GhcMonad m => m Bool
abandonAll :: GhcMonad m => m Bool
back :: GhcMonad m => m ([Name], Int, SrcSpan)
forward :: GhcMonad m => m ([Name], Int, SrcSpan)
showModule :: GhcMonad m => ModSummary -> m String
isModuleInterpreted :: GhcMonad m => ModSummary -> m Bool
compileExpr :: GhcMonad m => String -> m HValue
data HValue
dynCompileExpr :: GhcMonad m => String -> m Dynamic
lookupName :: GhcMonad m => Name -> m (Maybe TyThing)
obtainTermFromId :: GhcMonad m => Int -> Bool -> Id -> m Term
obtainTermFromVal :: GhcMonad m => Int -> Bool -> Type -> a -> m Term
reconstructType :: HscEnv -> Int -> Id -> IO (Maybe Type)
modInfoModBreaks :: ModuleInfo -> ModBreaks
data ModBreaks = ModBreaks {
modBreaks_flags :: BreakArray
modBreaks_locs :: !(Array BreakIndex SrcSpan)
modBreaks_vars :: !(Array BreakIndex [OccName])
}
type BreakIndex = Int
data BreakInfo
data BreakArray
setBreakOn :: BreakArray -> Int -> IO Bool
setBreakOff :: BreakArray -> Int -> IO Bool
getBreak :: BreakArray -> Int -> IO (Maybe Word)
data PackageId
data Module
mkModule :: PackageId -> ModuleName -> Module
pprModule :: Module -> SDoc
moduleName :: Module -> ModuleName
modulePackageId :: Module -> PackageId
data ModuleName
mkModuleName :: String -> ModuleName
moduleNameString :: ModuleName -> String
data Name
isExternalName :: Name -> Bool
nameModule :: Name -> Module
pprParenSymName :: NamedThing a => a -> SDoc
nameSrcSpan :: Name -> SrcSpan
class NamedThing a where
getOccName :: a -> OccName
getName :: a -> Name
data RdrName
= Unqual OccName
| Qual ModuleName OccName
type Id = Var
idType :: Id -> Kind
isImplicitId :: Id -> Bool
isDeadBinder :: Id -> Bool
isExportedId :: Id -> Bool
isLocalId :: Id -> Bool
isGlobalId :: Id -> Bool
isRecordSelector :: Id -> Bool
isPrimOpId :: Id -> Bool
isFCallId :: Id -> Bool
isClassOpId_maybe :: Id -> Maybe Class
isDataConWorkId :: Id -> Bool
idDataCon :: Id -> DataCon
isBottomingId :: Id -> Bool
isDictonaryId :: Id -> Bool
recordSelectorFieldLabel :: Id -> (TyCon, FieldLabel)
data TyCon
tyConTyVars :: TyCon -> [TyVar]
tyConDataCons :: TyCon -> [DataCon]
tyConArity :: TyCon -> Arity
isClassTyCon :: TyCon -> Bool
isSynTyCon :: TyCon -> Bool
isNewTyCon :: TyCon -> Bool
isPrimTyCon :: TyCon -> Bool
isFunTyCon :: TyCon -> Bool
isOpenTyCon :: TyCon -> Bool
synTyConDefn :: TyCon -> ([TyVar], Type)
synTyConType :: TyCon -> Type
synTyConResKind :: TyCon -> Kind
type TyVar = Var
alphaTyVars :: [TyVar]
data DataCon
dataConSig :: DataCon -> ([TyVar], ThetaType, [Type], Type)
dataConType :: DataCon -> Type
dataConTyCon :: DataCon -> TyCon
dataConFieldLabels :: DataCon -> [FieldLabel]
dataConIsInfix :: DataCon -> Bool
isVanillaDataCon :: DataCon -> Bool
dataConStrictMarks :: DataCon -> [StrictnessMark]
data StrictnessMark
= MarkedStrict
| MarkedUnboxed
| NotMarkedStrict
isMarkedStrict :: StrictnessMark -> Bool
data Class
classMethods :: Class -> [Id]
classSCTheta :: Class -> [PredType]
classTvsFds :: Class -> ([TyVar], [FunDep TyVar])
pprFundeps :: Outputable a => [FunDep a] -> SDoc
data Instance
instanceDFunId :: Instance -> DFunId
pprInstance :: Instance -> SDoc
pprInstanceHdr :: Instance -> SDoc
data Type
splitForAllTys :: Type -> ([TyVar], Type)
funResultTy :: Type -> Type
pprParendType :: Type -> SDoc
pprTypeApp :: NamedThing a => a -> [Type] -> SDoc
type Kind = Type
data PredType
type ThetaType = [PredType]
pprThetaArrow :: ThetaType -> SDoc
data TyThing
= AnId Id
| ADataCon DataCon
| ATyCon TyCon
| AClass Class
module HsSyn
data FixityDirection
= InfixL
| InfixR
| InfixN
defaultFixity :: Fixity
maxPrecedence :: Int
negateFixity :: Fixity
compareFixity :: Fixity -> Fixity -> (Bool, Bool)
data SrcLoc
pprDefnLoc :: SrcSpan -> SDoc
mkSrcLoc :: FastString -> Int -> Int -> SrcLoc
isGoodSrcLoc :: SrcLoc -> Bool
noSrcLoc :: SrcLoc
srcLocFile :: SrcLoc -> FastString
srcLocLine :: SrcLoc -> Int
srcLocCol :: SrcLoc -> Int
data SrcSpan
mkSrcSpan :: SrcLoc -> SrcLoc -> SrcSpan
srcLocSpan :: SrcLoc -> SrcSpan
isGoodSrcSpan :: SrcSpan -> Bool
noSrcSpan :: SrcSpan
srcSpanStart :: SrcSpan -> SrcLoc
srcSpanEnd :: SrcSpan -> SrcLoc
srcSpanFile :: SrcSpan -> FastString
srcSpanStartLine :: SrcSpan -> Int
srcSpanEndLine :: SrcSpan -> Int
srcSpanStartCol :: SrcSpan -> Int
srcSpanEndCol :: SrcSpan -> Int
data Located e = L SrcSpan e
noLoc :: e -> Located e
mkGeneralLocated :: String -> e -> Located e
getLoc :: Located e -> SrcSpan
unLoc :: Located e -> e
eqLocated :: Eq a => Located a -> Located a -> Bool
cmpLocated :: Ord a => Located a -> Located a -> Ordering
combineLocs :: Located a -> Located b -> SrcSpan
addCLoc :: Located a -> Located b -> c -> Located c
leftmost_smallest :: SrcSpan -> SrcSpan -> Ordering
leftmost_largest :: SrcSpan -> SrcSpan -> Ordering
rightmost :: SrcSpan -> SrcSpan -> Ordering
spans :: SrcSpan -> (Int, Int) -> Bool
isSubspanOf :: SrcSpan -> SrcSpan -> Bool
data GhcException
= PhaseFailed String ExitCode
| Interrupted
| UsageError String
| CmdLineError String
| Panic String
| InstallationError String
| ProgramError String
showGhcException :: GhcException -> String -> String
data Token
getTokenStream :: GhcMonad m => Module -> m [Located Token]
getRichTokenStream :: GhcMonad m => Module -> m [(Located Token, String)]
showRichTokenStream :: [(Located Token, String)] -> String
addSourceToTokens :: SrcLoc -> StringBuffer -> [Located Token] -> [(Located Token, String)]
cyclicModuleErr :: [ModSummary] -> SDoc
Initialisation
defaultErrorHandler :: (ExceptionMonad m, MonadIO m) => DynFlags -> m a -> m a
Install some default exception handlers and run the inner computation. Unless you want to handle exceptions yourself, you should wrap this around the top level of your program. The default handlers output the error message(s) to stderr and exit cleanly.
defaultCleanupHandler :: (ExceptionMonad m, MonadIO m) => DynFlags -> m a -> m a
Install a default cleanup handler to remove temporary files deposited by a GHC run. This is seperate from defaultErrorHandler, because you might want to override the error handling, but still get the ordinary cleanup behaviour.
GHC Monad
data Ghc a
A minimal implementation of a GhcMonad. If you need a custom monad, e.g., to maintain additional state consider wrapping this monad or using GhcT.
show/hide Instances
data GhcT m a

A monad transformer to add GHC specific features to another monad.

Note that the wrapped monad must support IO and handling of exceptions.

show/hide Instances
class (Functor m, MonadIO m, WarnLogMonad m, ExceptionMonad m) => GhcMonad m where

A monad that has all the features needed by GHC API calls.

In short, a GHC monad

  • allows embedding of IO actions,
  • can log warnings,
  • allows handling of (extensible) exceptions, and
  • maintains a current session.

If you do not use Ghc or GhcT, make sure to call GHC.initGhcMonad before any call to the GHC API functions can occur.

Methods
getSession :: m HscEnv
setSession :: HscEnv -> m ()
show/hide Instances
runGhc
::
=> Maybe FilePathSee argument to initGhcMonad.
-> Ghc aThe action to perform.
-> IO a

Run function for the Ghc monad.

It initialises the GHC session and warnings via initGhcMonad. Each call to this function will create a new session which should not be shared among several threads.

Any errors not handled inside the Ghc action are propagated as IO exceptions.

runGhcT
:: (ExceptionMonad m, Functor m, MonadIO m)
=> Maybe FilePathSee argument to initGhcMonad.
-> GhcT m aThe action to perform.
-> m a

Run function for GhcT monad transformer.

It initialises the GHC session and warnings via initGhcMonad. Each call to this function will create a new session which should not be shared among several threads.

initGhcMonad :: GhcMonad m => Maybe FilePath -> m ()

Initialise a GHC session.

If you implement a custom GhcMonad you must call this function in the monad run function. It will initialise the session variable and clear all warnings.

The first argument should point to the directory where GHC's library files reside. More precisely, this should be the output of ghc --print-libdir of the version of GHC the module using this API is compiled with. For portability, you should use the ghc-paths package, available at http://hackage.haskell.org/cgi-bin/hackage-scripts/package/ghc-paths.

gcatch :: (ExceptionMonad m, Exception e) => m a -> (e -> m a) -> m a
Generalised version of catch, allowing an arbitrary exception handling monad instead of just IO.
gbracket :: ExceptionMonad m => m a -> (a -> m b) -> (a -> m c) -> m c
Generalised version of bracket, allowing an arbitrary exception handling monad instead of just IO.
gfinally :: ExceptionMonad m => m a -> m b -> m a
Generalised version of finally, allowing an arbitrary exception handling monad instead of just IO.
clearWarnings :: WarnLogMonad m => m ()
Clear the log of Warnings.
getWarnings :: WarnLogMonad m => m WarningMessages
hasWarnings :: WarnLogMonad m => m Bool
Returns true if there were any warnings.
printExceptionAndWarnings :: GhcMonad m => SourceError -> m ()
Print the error message and all warnings. Useful inside exception handlers. Clears warnings after printing.
printWarnings :: GhcMonad m => m ()
Print all accumulated warnings using log_action.
handleSourceError
:: ExceptionMonad m
=> SourceError -> m aexception handler
-> m aaction to perform
-> m a
Perform the given action and call the exception handler if the action throws a SourceError. See SourceError for more information.
Flags and settings
data DynFlags
Contains not only a collection of DynFlags but also a plethora of information relating to the compilation of a single file or GHC session
Constructors
DynFlags
ghcMode :: GhcMode
ghcLink :: GhcLink
coreToDo :: Maybe [CoreToDo]
stgToDo :: Maybe [StgToDo]
hscTarget :: HscTarget
hscOutName :: StringName of the output file
extCoreName :: StringName of the .hcr output file
verbosity :: IntVerbosity level: see DynFlags
optLevel :: IntOptimisation level
simplPhases :: IntNumber of simplifier phases
maxSimplIterations :: IntMax simplifier iterations
shouldDumpSimplPhase :: SimplifierMode -> Bool
ruleCheck :: Maybe String
specConstrThreshold :: Maybe IntThreshold for SpecConstr
specConstrCount :: Maybe IntMax number of specialisations for any one function
liberateCaseThreshold :: Maybe IntThreshold for LiberateCase
stolen_x86_regs :: Int
cmdlineHcIncludes :: [String]
-#includes
importPaths :: [FilePath]
mainModIs :: Module
mainFunIs :: Maybe String
ctxtStkDepth :: IntTypechecker context stack depth
dphBackend :: DPHBackend
thisPackage :: PackageIdname of package currently being compiled
wayNames :: [WayName]Way flags from the command line
buildTag :: StringThe global "way" (e.g. "p" for prof)
rtsBuildTag :: StringThe RTS "way"
objectDir :: Maybe String
hiDir :: Maybe String
stubDir :: Maybe String
objectSuf :: String
hcSuf :: String
hiSuf :: String
outputFile :: Maybe String
outputHi :: Maybe String
dynLibLoader :: DynLibLoader
dumpPrefix :: Maybe FilePathThis is set by DriverPipeline.runPipeline based on where its output is going.
dumpPrefixForce :: Maybe FilePathOverride the dumpPrefix set by DriverPipeline.runPipeline. Set by -ddump-file-prefix
includePaths :: [String]
libraryPaths :: [String]
frameworkPaths :: [String]
cmdlineFrameworks :: [String]
tmpDir :: String
ghcUsagePath :: FilePath
ghciUsagePath :: FilePath
hpcDir :: StringPath to store the .mix files
opt_L :: [String]
opt_P :: [String]
opt_F :: [String]
opt_c :: [String]
opt_m :: [String]
opt_a :: [String]
opt_l :: [String]
opt_windres :: [String]
pgm_L :: String
pgm_P :: (String, [Option])
pgm_F :: String
pgm_c :: (String, [Option])
pgm_m :: (String, [Option])
pgm_s :: (String, [Option])
pgm_a :: (String, [Option])
pgm_l :: (String, [Option])
pgm_dll :: (String, [Option])
pgm_T :: String
pgm_sysman :: String
pgm_windres :: String
depMakefile :: FilePath
depIncludePkgDeps :: Bool
depExcludeMods :: [ModuleName]
depSuffixes :: [String]
extraPkgConfs :: [FilePath]
topDir :: FilePath
systemPackageConfig :: FilePathThe -package-conf flags given on the command line, in the order they appeared.
packageFlags :: [PackageFlag]The -package and -hide-package flags from the command-line
pkgDatabase :: Maybe (UniqFM PackageConfig)
pkgState :: PackageState
flags :: [DynFlag]
log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO ()Message output action: use ErrUtils instead of this if you can
haddockOptions :: Maybe String
data DynFlag
Enumerates the simple on-or-off dynamic flags
Constructors
Opt_D_dump_cmm
Opt_D_dump_cmmz
Opt_D_dump_cmmz_pretty
Opt_D_dump_cps_cmm
Opt_D_dump_cvt_cmm
Opt_D_dump_asm
Opt_D_dump_asm_native
Opt_D_dump_asm_liveness
Opt_D_dump_asm_coalesce
Opt_D_dump_asm_regalloc
Opt_D_dump_asm_regalloc_stages
Opt_D_dump_asm_conflicts
Opt_D_dump_asm_stats
Opt_D_dump_cpranal
Opt_D_dump_deriv
Opt_D_dump_ds
Opt_D_dump_flatC
Opt_D_dump_foreign
Opt_D_dump_inlinings
Opt_D_dump_rule_firings
Opt_D_dump_occur_anal
Opt_D_dump_parsed
Opt_D_dump_rn
Opt_D_dump_simpl
Opt_D_dump_simpl_iterations
Opt_D_dump_simpl_phases
Opt_D_dump_spec
Opt_D_dump_prep
Opt_D_dump_stg
Opt_D_dump_stranal
Opt_D_dump_tc
Opt_D_dump_types
Opt_D_dump_rules
Opt_D_dump_cse
Opt_D_dump_worker_wrapper
Opt_D_dump_rn_trace
Opt_D_dump_rn_stats
Opt_D_dump_opt_cmm
Opt_D_dump_simpl_stats
Opt_D_dump_tc_trace
Opt_D_dump_if_trace
Opt_D_dump_splices
Opt_D_dump_BCOs
Opt_D_dump_vect
Opt_D_dump_hpc
Opt_D_dump_rtti
Opt_D_source_stats
Opt_D_verbose_core2core
Opt_D_verbose_stg2stg
Opt_D_dump_hi
Opt_D_dump_hi_diffs
Opt_D_dump_minimal_imports
Opt_D_dump_mod_cycles
Opt_D_dump_view_pattern_commoning
Opt_D_faststring_stats
Opt_DumpToFileAppend dump output to files instead of stdout.
Opt_D_no_debug_output
Opt_DoCoreLinting
Opt_DoStgLinting
Opt_DoCmmLinting
Opt_DoAsmLinting
Opt_WarnIsError
Opt_WarnDuplicateExports
Opt_WarnHiShadows
Opt_WarnImplicitPrelude
Opt_WarnIncompletePatterns
Opt_WarnIncompletePatternsRecUpd
Opt_WarnMissingFields
Opt_WarnMissingMethods
Opt_WarnMissingSigs
Opt_WarnNameShadowing
Opt_WarnOverlappingPatterns
Opt_WarnSimplePatterns
Opt_WarnTypeDefaults
Opt_WarnMonomorphism
Opt_WarnUnusedBinds
Opt_WarnUnusedImports
Opt_WarnUnusedMatches
Opt_WarnWarningsDeprecations
Opt_WarnDeprecatedFlags
Opt_WarnDodgyImports
Opt_WarnOrphans
Opt_WarnTabs
Opt_WarnUnrecognisedPragmas
Opt_WarnDodgyForeignImports
Opt_OverlappingInstances
Opt_UndecidableInstances
Opt_IncoherentInstances
Opt_MonomorphismRestriction
Opt_MonoPatBinds
Opt_ExtendedDefaultRules
Opt_ForeignFunctionInterface
Opt_UnliftedFFITypes
Opt_PArr
Opt_Arrows
Opt_TemplateHaskell
Opt_QuasiQuotes
Opt_ImplicitParams
Opt_Generics
Opt_ImplicitPrelude
Opt_ScopedTypeVariables
Opt_UnboxedTuples
Opt_BangPatterns
Opt_TypeFamilies
Opt_OverloadedStrings
Opt_DisambiguateRecordFields
Opt_RecordWildCards
Opt_RecordPuns
Opt_ViewPatterns
Opt_GADTs
Opt_RelaxedPolyRec
Opt_StandaloneDeriving
Opt_DeriveDataTypeable
Opt_TypeSynonymInstances
Opt_FlexibleContexts
Opt_FlexibleInstances
Opt_ConstrainedClassMethods
Opt_MultiParamTypeClasses
Opt_FunctionalDependencies
Opt_UnicodeSyntax
Opt_PolymorphicComponents
Opt_ExistentialQuantification
Opt_MagicHash
Opt_EmptyDataDecls
Opt_KindSignatures
Opt_ParallelListComp
Opt_TransformListComp
Opt_GeneralizedNewtypeDeriving
Opt_RecursiveDo
Opt_PostfixOperators
Opt_PatternGuards
Opt_LiberalTypeSynonyms
Opt_Rank2Types
Opt_RankNTypes
Opt_ImpredicativeTypes
Opt_TypeOperators
Opt_PackageImports
Opt_NewQualifiedOperators
Opt_PrintExplicitForalls
Opt_Strictness
Opt_FullLaziness
Opt_StaticArgumentTransformation
Opt_CSE
Opt_LiberateCase
Opt_SpecConstr
Opt_IgnoreInterfacePragmas
Opt_OmitInterfacePragmas
Opt_DoLambdaEtaExpansion
Opt_IgnoreAsserts
Opt_DoEtaReduction
Opt_CaseMerge
Opt_UnboxStrictFields
Opt_MethodSharing
Opt_DictsCheap
Opt_InlineIfEnoughArgs
Opt_EnableRewriteRules
Opt_Vectorise
Opt_RegsGraph
Opt_RegsIterative
Opt_Cpp
Opt_Pp
Opt_ForceRecomp
Opt_DryRun
Opt_DoAsmMangling
Opt_ExcessPrecision
Opt_ReadUserPackageConf
Opt_NoHsMain
Opt_SplitObjs
Opt_StgStats
Opt_HideAllPackages
Opt_PrintBindResult
Opt_Haddock
Opt_HaddockOptions
Opt_Hpc_No_Auto
Opt_BreakOnException
Opt_BreakOnError
Opt_PrintEvldWithShow
Opt_PrintBindContents
Opt_GenManifest
Opt_EmbedManifest
Opt_RunCPSZ
Opt_ConvertToZipCfgAndBack
Opt_AutoLinkPackages
Opt_ImplicitImportQualified
Opt_KeepHiDiffs
Opt_KeepHcFiles
Opt_KeepSFiles
Opt_KeepRawSFiles
Opt_KeepTmpFiles
Opt_KeepRawTokenStream
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data Severity
Constructors
SevInfo
SevWarning
SevError
SevFatal
data HscTarget

The target code type of the compilation (if any).

HscNothing can be used to avoid generating any output, however, note that:

  • This will not run the desugaring step, thus no warnings generated in this step will be output. In particular, this includes warnings related to pattern matching.
  • At the moment switching from HscNothing to HscInterpreted without unloading first is not safe. To unload use GHC.setTargets [] >> GHC.load LoadAllTargets.
Constructors
HscC
HscAsm
HscJava
HscInterpreted
HscNothing
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dopt :: DynFlag -> DynFlags -> Bool
Test whether a DynFlag is set
data GhcMode
The GhcMode tells us whether we're doing multi-module compilation (controlled via the GHC API) or one-shot (single-module) compilation. This makes a difference primarily to the Finder: in one-shot mode we look for interface files for imported modules, but in multi-module mode we look for source files in order to check whether they need to be recompiled.
Constructors
CompManager--make, GHCi, etc.
OneShot
ghc -c Foo.hs
MkDependghc -M, see Finder for why we need this
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data GhcLink
What to do in the link step, if there is one.
Constructors
NoLinkDon't link at all
LinkBinaryLink object code into a binary
LinkInMemoryUse the in-memory dynamic linker
LinkDynLibLink objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
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defaultObjectTarget :: HscTarget
The HscTarget value corresponding to the default way to create object files on the current platform.
parseDynamicFlags
:: Monad m
=> DynFlags
-> [Located String]
-> m (DynFlags, [Located String], [Located String])Updated DynFlags, left-over arguments, and list of warnings.
Parse dynamic flags from a list of command line arguments. Returns the the parsed DynFlags, the left-over arguments, and a list of warnings. Throws a UsageError if errors occurred during parsing (such as unknown flags or missing arguments).
getSessionDynFlags :: GhcMonad m => m DynFlags
Grabs the DynFlags from the Session
setSessionDynFlags :: GhcMonad m => DynFlags -> m [PackageId]

Updates the DynFlags in a Session. This also reads the package database (unless it has already been read), and prepares the compilers knowledge about packages. It can be called again to load new packages: just add new package flags to (packageFlags dflags).

Returns a list of new packages that may need to be linked in using the dynamic linker (see linkPackages) as a result of new package flags. If you are not doing linking or doing static linking, you can ignore the list of packages returned.

parseStaticFlags :: [Located String] -> IO ([Located String], [Located String])

Parses GHC's static flags from a list of command line arguments.

These flags are static in the sense that they can be set only once and they are global, meaning that they affect every instance of GHC running; multiple GHC threads will use the same flags.

This function must be called before any session is started, i.e., before the first call to GHC.withGhc.

Static flags are more of a hack and are static for more or less historical reasons. In the long run, most static flags should eventually become dynamic flags.

XXX: can we add an auto-generated list of static flags here?

Targets
data Target

A compilation target.

A target may be supplied with the actual text of the module. If so, use this instead of the file contents (this is for use in an IDE where the file hasn't been saved by the user yet).

Constructors
Target
targetId :: TargetIdmodule or filename
targetAllowObjCode :: Boolobject code allowed?
targetContents :: Maybe (StringBuffer, ClockTime)in-memory text buffer?
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data TargetId
Constructors
TargetModule ModuleNameA module name: search for the file
TargetFile FilePath (Maybe Phase)A filename: preprocess & parse it to find the module name. If specified, the Phase indicates how to compile this file (which phase to start from). Nothing indicates the starting phase should be determined from the suffix of the filename.
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data Phase
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setTargets :: GhcMonad m => [Target] -> m ()
Sets the targets for this session. Each target may be a module name or a filename. The targets correspond to the set of root modules for the program/library. Unloading the current program is achieved by setting the current set of targets to be empty, followed by load.
getTargets :: GhcMonad m => m [Target]
Returns the current set of targets
addTarget :: GhcMonad m => Target -> m ()
Add another target.
removeTarget :: GhcMonad m => TargetId -> m ()
Remove a target
guessTarget :: GhcMonad m => String -> Maybe Phase -> m Target

Attempts to guess what Target a string refers to. This function implements the --make/GHCi command-line syntax for filenames:

  • if the string looks like a Haskell source filename, then interpret it as such
  • if adding a .hs or .lhs suffix yields the name of an existing file, then use that
  • otherwise interpret the string as a module name
Extending the program scope
extendGlobalRdrScope :: GhcMonad m => [GlobalRdrElt] -> m ()
setGlobalRdrScope :: GhcMonad m => [GlobalRdrElt] -> m ()
extendGlobalTypeScope :: GhcMonad m => [Id] -> m ()
setGlobalTypeScope :: GhcMonad m => [Id] -> m ()
Loading/compiling the program
depanal
:: GhcMonad m
=> [ModuleName]excluded modules
-> Boolallow duplicate roots
-> m ModuleGraph
Perform a dependency analysis starting from the current targets and update the session with the new module graph.
load :: GhcMonad m => LoadHowMuch -> m SuccessFlag

Try to load the program. Calls loadWithLogger with the default compiler that just immediately logs all warnings and errors.

This function may throw a SourceError if errors are encountered before the actual compilation starts (e.g., during dependency analysis).

loadWithLogger :: GhcMonad m => WarnErrLogger -> LoadHowMuch -> m SuccessFlag

Try to load the program. If a Module is supplied, then just attempt to load up to this target. If no Module is supplied, then try to load all targets.

The first argument is a function that is called after compiling each module to print wanrings and errors.

While compiling a module, all SourceErrors are caught and passed to the logger, however, this function may still throw a SourceError if dependency analysis failed (e.g., due to a parse error).

data LoadHowMuch
Constructors
LoadAllTargets
LoadUpTo ModuleName
LoadDependenciesOf ModuleName
data SuccessFlag
Constructors
Succeeded
Failed
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defaultWarnErrLogger :: WarnErrLogger
type WarnErrLogger = GhcMonad m => Maybe SourceError -> m ()
A function called to log warnings and errors.
workingDirectoryChanged :: GhcMonad m => m ()
Inform GHC that the working directory has changed. GHC will flush its cache of module locations, since it may no longer be valid. Note: if you change the working directory, you should also unload the current program (set targets to empty, followed by load).
parseModule :: GhcMonad m => ModSummary -> m ParsedModule

Parse a module.

Throws a SourceError on parse error.

typecheckModule :: GhcMonad m => ParsedModule -> m TypecheckedModule

Typecheck and rename a parsed module.

Throws a SourceError if either fails.

desugarModule :: GhcMonad m => TypecheckedModule -> m DesugaredModule
Desugar a typechecked module.
loadModule :: (TypecheckedMod mod, GhcMonad m) => mod -> m mod

Load a module. Input doesn't need to be desugared.

XXX: Describe usage.

data ParsedModule
The result of successful parsing.
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data TypecheckedModule
The result of successful typechecking. It also contains the parser result.
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data DesugaredModule
The result of successful desugaring (i.e., translation to core). Also contains all the information of a typechecked module.
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type TypecheckedSource = LHsBinds Id
type ParsedSource = Located (HsModule RdrName)
type RenamedSource = (HsGroup Name, [LImportDecl Name], Maybe [LIE Name], Maybe (HsDoc Name), HaddockModInfo Name)
class ParsedMod m => TypecheckedMod m where
Methods
renamedSource :: m -> Maybe RenamedSource
typecheckedSource :: m -> TypecheckedSource
moduleInfo :: m -> ModuleInfo
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class ParsedMod m where
Methods
parsedSource :: m -> ParsedSource
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coreModule :: DesugaredMod m => m -> ModGuts
compileToCoreModule :: GhcMonad m => FilePath -> m CoreModule
This is the way to get access to the Core bindings corresponding to a module. compileToCore parses, typechecks, and desugars the module, then returns the resulting Core module (consisting of the module name, type declarations, and function declarations) if successful.
compileToCoreSimplified :: GhcMonad m => FilePath -> m CoreModule
Like compileToCoreModule, but invokes the simplifier, so as to return simplified and tidied Core.
compileCoreToObj :: GhcMonad m => Bool -> CoreModule -> m ()
Takes a CoreModule and compiles the bindings therein to object code. The first argument is a bool flag indicating whether to run the simplifier. The resulting .o, .hi, and executable files, if any, are stored in the current directory, and named according to the module name. Returns True iff compilation succeeded. This has only so far been tested with a single self-contained module.
getModSummary :: GhcMonad m => ModuleName -> m ModSummary

Return the ModSummary of a module with the given name.

The module must be part of the module graph (see hsc_mod_graph and ModuleGraph). If this is not the case, this function will throw a GhcApiError.

This function ignores boot modules and requires that there is only one non-boot module with the given name.

Parsing Haddock comments
parseHaddockComment :: String -> Either String (HsDoc RdrName)
Inspecting the module structure of the program
type ModuleGraph = [ModSummary]

A ModuleGraph contains all the nodes from the home package (only). There will be a node for each source module, plus a node for each hi-boot module.

The graph is not necessarily stored in topologically-sorted order.

data ModSummary

A single node in a 'ModuleGraph. The nodes of the module graph are one of:

  • A regular Haskell source module
  • A hi-boot source module
  • An external-core source module
Constructors
ModSummary
ms_mod :: ModuleIdentity of the module
ms_hsc_src :: HscSourceThe module source either plain Haskell, hs-boot or external core
ms_location :: ModLocationLocation of the various files belonging to the module
ms_hs_date :: ClockTimeTimestamp of source file
ms_obj_date :: Maybe ClockTimeTimestamp of object, if we have one
ms_srcimps :: [Located ModuleName]Source imports of the module
ms_imps :: [Located ModuleName]Non-source imports of the module
ms_hspp_file :: FilePathFilename of preprocessed source file
ms_hspp_opts :: DynFlagsCached flags from OPTIONS, INCLUDE and LANGUAGE pragmas in the modules source code
ms_hspp_buf :: Maybe StringBufferThe actual preprocessed source, if we have it
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ms_mod_name :: ModSummary -> ModuleName
data ModLocation
Where a module lives on the file system: the actual locations of the .hs, .hi and .o files, if we have them
Constructors
ModLocation
ml_hs_file :: Maybe FilePath
ml_hi_file :: FilePath
ml_obj_file :: FilePath
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getModuleGraph :: GhcMonad m => m ModuleGraph
Get the module dependency graph.
isLoaded :: GhcMonad m => ModuleName -> m Bool
Return True == module is loaded.
topSortModuleGraph :: Bool -> [ModSummary] -> Maybe ModuleName -> [SCC ModSummary]
Inspecting modules
data ModuleInfo
Container for information about a Module.
getModuleInfo :: GhcMonad m => Module -> m (Maybe ModuleInfo)
Request information about a loaded Module
modInfoTyThings :: ModuleInfo -> [TyThing]
The list of top-level entities defined in a module
modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
modInfoExports :: ModuleInfo -> [Name]
modInfoInstances :: ModuleInfo -> [Instance]
Returns the instances defined by the specified module. Warning: currently unimplemented for package modules.
modInfoIsExportedName :: ModuleInfo -> Name -> Bool
modInfoLookupName :: GhcMonad m => ModuleInfo -> Name -> m (Maybe TyThing)
lookupGlobalName :: GhcMonad m => Name -> m (Maybe TyThing)
Looks up a global name: that is, any top-level name in any visible module. Unlike lookupName, lookupGlobalName does not use the interactive context, and therefore does not require a preceding setContext.
mkPrintUnqualifiedForModule :: GhcMonad m => ModuleInfo -> m (Maybe PrintUnqualified)
Querying the environment
packageDbModules
:: GhcMonad m
=> BoolOnly consider exposed packages.
-> m [Module]
Return all external modules available in the package database. Modules from the current session (i.e., from the HomePackageTable) are not included.
Printing
type PrintUnqualified = (QueryQualifyName, QueryQualifyModule)
alwaysQualify :: PrintUnqualified
Interactive evaluation
getBindings :: GhcMonad m => m [TyThing]
Return the bindings for the current interactive session.
getPrintUnqual :: GhcMonad m => m PrintUnqualified
findModule :: GhcMonad m => ModuleName -> Maybe FastString -> m Module
Takes a ModuleName and possibly a PackageId, and consults the filesystem and package database to find the corresponding Module, using the algorithm that is used for an import declaration.
setContext
:: GhcMonad m
=> [Module]entire top level scope of these modules
-> [Module]exports only of these modules
-> m ()

Set the interactive evaluation context.

Setting the context doesn't throw away any bindings; the bindings we've built up in the InteractiveContext simply move to the new module. They always shadow anything in scope in the current context.

getContext :: GhcMonad m => m ([Module], [Module])
Get the interactive evaluation context, consisting of a pair of the set of modules from which we take the full top-level scope, and the set of modules from which we take just the exports respectively.
getNamesInScope :: GhcMonad m => m [Name]
Returns all names in scope in the current interactive context
getRdrNamesInScope :: GhcMonad m => m [RdrName]
getGRE :: GhcMonad m => m GlobalRdrEnv
get the GlobalRdrEnv for a session
moduleIsInterpreted :: GhcMonad m => Module -> m Bool
Returns True if the specified module is interpreted, and hence has its full top-level scope available.
getInfo :: GhcMonad m => Name -> m (Maybe (TyThing, Fixity, [Instance]))
Looks up an identifier in the current interactive context (for :info) Filter the instances by the ones whose tycons (or clases resp) are in scope (qualified or otherwise). Otherwise we list a whole lot too many! The exact choice of which ones to show, and which to hide, is a judgement call. (see Trac #1581)
exprType :: GhcMonad m => String -> m Type
Get the type of an expression
typeKind :: GhcMonad m => String -> m Kind
Get the kind of a type
parseName :: GhcMonad m => String -> m [Name]
Parses a string as an identifier, and returns the list of Names that the identifier can refer to in the current interactive context.
data RunResult
Constructors
RunOk [Name]names bound by this evaluation
RunFailedstatement failed compilation
RunException SomeExceptionstatement raised an exception
RunBreak ThreadId [Name] (Maybe BreakInfo)
runStmt :: GhcMonad m => String -> SingleStep -> m RunResult
Run a statement in the current interactive context. Statement may bind multple values.
data SingleStep
Constructors
RunToCompletion
SingleStep
RunAndLogSteps
resume :: GhcMonad m => (SrcSpan -> Bool) -> SingleStep -> m RunResult
data Resume
data History
getHistorySpan :: GhcMonad m => History -> m SrcSpan
getHistoryModule :: History -> Module
getResumeContext :: GhcMonad m => m [Resume]
abandon :: GhcMonad m => m Bool
abandonAll :: GhcMonad m => m Bool
back :: GhcMonad m => m ([Name], Int, SrcSpan)
forward :: GhcMonad m => m ([Name], Int, SrcSpan)
showModule :: GhcMonad m => ModSummary -> m String
isModuleInterpreted :: GhcMonad m => ModSummary -> m Bool
compileExpr :: GhcMonad m => String -> m HValue
data HValue
dynCompileExpr :: GhcMonad m => String -> m Dynamic
lookupName :: GhcMonad m => Name -> m (Maybe TyThing)
Returns the TyThing for a Name. The Name may refer to any entity known to GHC, including Names defined using runStmt.
obtainTermFromId :: GhcMonad m => Int -> Bool -> Id -> m Term
obtainTermFromVal :: GhcMonad m => Int -> Bool -> Type -> a -> m Term
reconstructType :: HscEnv -> Int -> Id -> IO (Maybe Type)
modInfoModBreaks :: ModuleInfo -> ModBreaks
data ModBreaks
All the information about the breakpoints for a given module
Constructors
ModBreaks
modBreaks_flags :: BreakArrayThe array of flags, one per breakpoint, indicating which breakpoints are enabled.
modBreaks_locs :: !(Array BreakIndex SrcSpan)An array giving the source span of each breakpoint.
modBreaks_vars :: !(Array BreakIndex [OccName])An array giving the names of the free variables at each breakpoint.
type BreakIndex = Int
Breakpoint index
data BreakInfo
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data BreakArray
setBreakOn :: BreakArray -> Int -> IO Bool
setBreakOff :: BreakArray -> Int -> IO Bool
getBreak :: BreakArray -> Int -> IO (Maybe Word)
Abstract syntax elements
Packages
data PackageId
Essentially just a string identifying a package, including the version: e.g. parsec-1.0
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Modules
data Module
A Module is a pair of a PackageId and a ModuleName.
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mkModule :: PackageId -> ModuleName -> Module
pprModule :: Module -> SDoc
moduleName :: Module -> ModuleName
modulePackageId :: Module -> PackageId
data ModuleName
A ModuleName is essentially a simple string, e.g. Data.List.
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mkModuleName :: String -> ModuleName
moduleNameString :: ModuleName -> String
Names
data Name
A unique, unambigious name for something, containing information about where that thing originated.
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isExternalName :: Name -> Bool
nameModule :: Name -> Module
pprParenSymName :: NamedThing a => a -> SDoc
print a NamedThing, adding parentheses if the name is an operator.
nameSrcSpan :: Name -> SrcSpan
class NamedThing a where
A class allowing convenient access to the Name of various datatypes
Methods
getOccName :: a -> OccName
getName :: a -> Name
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data RdrName
Do not use the data constructors of RdrName directly: prefer the family of functions that creates them, such as mkRdrUnqual
Constructors
Unqual OccNameUsed for ordinary, unqualified occurrences, e.g. x, y or Foo. Create such a RdrName with mkRdrUnqual
Qual ModuleName OccNameA qualified name written by the user in source code. The module isn't necessarily the module where the thing is defined; just the one from which it is imported. Examples are Bar.x, Bar.y or Bar.Foo. Create such a RdrName with mkRdrQual
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Identifiers
type Id = Var
idType :: Id -> Kind
isImplicitId :: Id -> Bool
isImplicitId tells whether an Ids info is implied by other declarations, so we don't need to put its signature in an interface file, even if it's mentioned in some other interface unfolding.
isDeadBinder :: Id -> Bool
isExportedId :: Id -> Bool
Determines whether an Id is marked as exported and hence will not be considered dead code
isLocalId :: Id -> Bool
For an explanation of global vs. local Ids, see Var
isGlobalId :: Id -> Bool
For an explanation of global vs. local Ids, see Var
isRecordSelector :: Id -> Bool
isPrimOpId :: Id -> Bool
isFCallId :: Id -> Bool
isClassOpId_maybe :: Id -> Maybe Class
isDataConWorkId :: Id -> Bool
idDataCon :: Id -> DataCon

Get from either the worker or the wrapper Id to the DataCon. Currently used only in the desugarer.

INVARIANT: idDataCon (dataConWrapId d) = d: remember, dataConWrapId can return either the wrapper or the worker

isBottomingId :: Id -> Bool
Returns true if an application to n args would diverge
isDictonaryId :: Id -> Bool
recordSelectorFieldLabel :: Id -> (TyCon, FieldLabel)
If the Id is that for a record selector, extract the sel_tycon and label. Panic otherwise
Type constructors
data TyCon

Represents type constructors. Type constructors are introduced by things such as:

1) Data declarations: data Foo = ... creates the Foo type constructor of kind *

2) Type synonyms: type Foo = ... creates the Foo type constructor

3) Newtypes: newtype Foo a = MkFoo ... creates the Foo type constructor of kind * -> *

4) Class declarations: class Foo where creates the Foo type constructor of kind *

5) Type coercions! This is because we represent a coercion from t1 to t2 as a Type, where that type has kind t1 ~ t2. See Coercion for more on this

This data type also encodes a number of primitive, built in type constructors such as those for function and tuple types.

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tyConTyVars :: TyCon -> [TyVar]
tyConDataCons :: TyCon -> [DataCon]
As tyConDataCons_maybe, but returns the empty list of constructors if no constructors could be found
tyConArity :: TyCon -> Arity
isClassTyCon :: TyCon -> Bool
Is this TyCon that for a class instance?
isSynTyCon :: TyCon -> Bool

A product TyCon must both:

1. Have one constructor

2. Not be existential

However other than this there are few restrictions: they may be data or newtype TyCons of any boxity and may even be recursive.

Is this a TyCon representing a type synonym (type)?

isNewTyCon :: TyCon -> Bool
Is this TyCon that for a newtype
isPrimTyCon :: TyCon -> Bool
Does this TyCon represent something that cannot be defined in Haskell?
isFunTyCon :: TyCon -> Bool
isOpenTyCon :: TyCon -> Bool
Is this a TyCon, synonym or otherwise, that may have further instances appear?
synTyConDefn :: TyCon -> ([TyVar], Type)
Extract the TyVars bound by a type synonym and the corresponding (unsubstituted) right hand side. If the given TyCon is not a type synonym, panics
synTyConType :: TyCon -> Type
Find the expansion of the type synonym represented by the given TyCon. The free variables of this type will typically include those TyVars bound by the TyCon. Panics if the TyCon is not that of a type synonym
synTyConResKind :: TyCon -> Kind
Find the Kind of an open type synonym. Panics if the TyCon is not an open type synonym
Type variables
type TyVar = Var
alphaTyVars :: [TyVar]
Data constructors
data DataCon
A data constructor
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dataConSig :: DataCon -> ([TyVar], ThetaType, [Type], Type)

The "signature" of the DataCon returns, in order:

1) The result of dataConAllTyVars,

2) All the ThetaTypes relating to the DataCon (coercion, dictionary, implicit parameter - whatever)

3) The type arguments to the constructor

4) The original result type of the DataCon

dataConType :: DataCon -> Type
dataConTyCon :: DataCon -> TyCon
The type constructor that we are building via this data constructor
dataConFieldLabels :: DataCon -> [FieldLabel]
The labels for the fields of this particular DataCon
dataConIsInfix :: DataCon -> Bool
Should the DataCon be presented infix?
isVanillaDataCon :: DataCon -> Bool
Vanilla DataCons are those that are nice boring Haskell 98 constructors
dataConStrictMarks :: DataCon -> [StrictnessMark]
The strictness markings decided on by the compiler. Does not include those for existential dictionaries. The list is in one-to-one correspondence with the arity of the DataCon
data StrictnessMark
Constructors
MarkedStrict
MarkedUnboxed
NotMarkedStrict
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isMarkedStrict :: StrictnessMark -> Bool
Classes
data Class
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classMethods :: Class -> [Id]
classSCTheta :: Class -> [PredType]
classTvsFds :: Class -> ([TyVar], [FunDep TyVar])
pprFundeps :: Outputable a => [FunDep a] -> SDoc
Instances
data Instance
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instanceDFunId :: Instance -> DFunId
pprInstance :: Instance -> SDoc
pprInstanceHdr :: Instance -> SDoc
Types and Kinds
data Type
The key representation of types within the compiler
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splitForAllTys :: Type -> ([TyVar], Type)
Attempts to take a forall type apart, returning all the immediate such bound type variables and the remainder of the type. Always suceeds, even if that means returning an empty list of TyVars
funResultTy :: Type -> Type
Extract the function result type and panic if that is not possible
pprParendType :: Type -> SDoc
pprTypeApp :: NamedThing a => a -> [Type] -> SDoc
type Kind = Type

The key type representing kinds in the compiler. Invariant: a kind is always in one of these forms:

 FunTy k1 k2
 TyConApp PrimTyCon [...]
 TyVar kv   -- (during inference only)
 ForAll ... -- (for top-level coercions)
data PredType

A type of the form PredTy p represents a value whose type is the Haskell predicate p, where a predicate is what occurs before the => in a Haskell type. It can be expanded into its representation, but:

  • The type checker must treat it as opaque
  • The rest of the compiler treats it as transparent

Consider these examples:

 f :: (Eq a) => a -> Int
 g :: (?x :: Int -> Int) => a -> Int
 h :: (r\l) => {r} => {l::Int | r}

Here the Eq a and ?x :: Int -> Int and rl are all called "predicates"

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type ThetaType = [PredType]
A collection of PredTypes
pprThetaArrow :: ThetaType -> SDoc
Entities
data TyThing
A typecheckable-thing, essentially anything that has a name
Constructors
AnId Id
ADataCon DataCon
ATyCon TyCon
AClass Class
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Syntax
module HsSyn
Fixities
data FixityDirection
Constructors
InfixL
InfixR
InfixN
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defaultFixity :: Fixity
maxPrecedence :: Int
negateFixity :: Fixity
compareFixity :: Fixity -> Fixity -> (Bool, Bool)
Source locations
data SrcLoc
Represents a single point within a file
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pprDefnLoc :: SrcSpan -> SDoc
Pretty prints information about the SrcSpan in the style defined at ...
mkSrcLoc :: FastString -> Int -> Int -> SrcLoc
isGoodSrcLoc :: SrcLoc -> Bool
Good SrcLocs have precise information about their location
noSrcLoc :: SrcLoc
srcLocFile :: SrcLoc -> FastString
Gives the filename of the SrcLoc if it is available, otherwise returns a dummy value
srcLocLine :: SrcLoc -> Int
Raises an error when used on a bad SrcLoc
srcLocCol :: SrcLoc -> Int
Raises an error when used on a bad SrcLoc
data SrcSpan

A SrcSpan delimits a portion of a text file. It could be represented by a pair of (line,column) coordinates, but in fact we optimise slightly by using more compact representations for single-line and zero-length spans, both of which are quite common.

The end position is defined to be the column after the end of the span. That is, a span of (1,1)-(1,2) is one character long, and a span of (1,1)-(1,1) is zero characters long.

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mkSrcSpan :: SrcLoc -> SrcLoc -> SrcSpan
Create a SrcSpan between two points in a file
srcLocSpan :: SrcLoc -> SrcSpan
Create a SrcSpan corresponding to a single point
isGoodSrcSpan :: SrcSpan -> Bool
Test if a SrcSpan is good, i.e. has precise location information
noSrcSpan :: SrcSpan
srcSpanStart :: SrcSpan -> SrcLoc
Returns the location at the start of the SrcSpan or a bad SrcSpan if that is unavailable
srcSpanEnd :: SrcSpan -> SrcLoc
Returns the location at the end of the SrcSpan or a bad SrcSpan if that is unavailable
srcSpanFile :: SrcSpan -> FastString
srcSpanStartLine :: SrcSpan -> Int
Raises an error when used on a bad SrcSpan
srcSpanEndLine :: SrcSpan -> Int
Raises an error when used on a bad SrcSpan
srcSpanStartCol :: SrcSpan -> Int
Raises an error when used on a bad SrcSpan
srcSpanEndCol :: SrcSpan -> Int
Raises an error when used on a bad SrcSpan
Located
data Located e
We attach SrcSpans to lots of things, so let's have a datatype for it.
Constructors
L SrcSpan e
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Constructing Located
noLoc :: e -> Located e
mkGeneralLocated :: String -> e -> Located e
Deconstructing Located
getLoc :: Located e -> SrcSpan
unLoc :: Located e -> e
Combining and comparing Located values
eqLocated :: Eq a => Located a -> Located a -> Bool
Tests whether the two located things are equal
cmpLocated :: Ord a => Located a -> Located a -> Ordering
Tests the ordering of the two located things
combineLocs :: Located a -> Located b -> SrcSpan
addCLoc :: Located a -> Located b -> c -> Located c
Combine locations from two Located things and add them to a third thing
leftmost_smallest :: SrcSpan -> SrcSpan -> Ordering
leftmost_largest :: SrcSpan -> SrcSpan -> Ordering
Alternative strategies for ordering SrcSpans
rightmost :: SrcSpan -> SrcSpan -> Ordering
spans :: SrcSpan -> (Int, Int) -> Bool
Determines whether a span encloses a given line and column index
isSubspanOf
:: SrcSpanThe span that may be enclosed by the other
-> SrcSpanThe span it may be enclosed by
-> Bool
Determines whether a span is enclosed by another one
Exceptions
data GhcException
Constructors
PhaseFailed String ExitCode
Interrupted
UsageError String
CmdLineError String
Panic String
InstallationError String
ProgramError String
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showGhcException :: GhcException -> String -> String
Token stream manipulations
data Token
getTokenStream :: GhcMonad m => Module -> m [Located Token]

Return module source as token stream, including comments.

The module must be in the module graph and its source must be available. Throws a SourceError on parse error.

getRichTokenStream :: GhcMonad m => Module -> m [(Located Token, String)]
Give even more information on the source than getTokenStream This function allows reconstructing the source completely with showRichTokenStream.
showRichTokenStream :: [(Located Token, String)] -> String
Take a rich token stream such as produced from getRichTokenStream and return source code almost identical to the original code (except for insignificant whitespace.)
addSourceToTokens :: SrcLoc -> StringBuffer -> [Located Token] -> [(Located Token, String)]
Given a source location and a StringBuffer corresponding to this location, return a rich token stream with the source associated to the tokens.
Miscellaneous
cyclicModuleErr :: [ModSummary] -> SDoc
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