ghc-8.2.2: The GHC API

Safe HaskellNone
LanguageHaskell2010

GHC

Contents

Synopsis

Initialisation

defaultErrorHandler :: ExceptionMonad m => FatalMessager -> FlushOut -> 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 => DynFlags -> m a -> m a #

Deprecated: Cleanup is now done by runGhc/runGhcT

This function is no longer necessary, cleanup is now done by runGhc/runGhcT.

withSignalHandlers :: (ExceptionMonad m, MonadIO m) => m a -> m a #

Temporarily install standard signal handlers for catching ^C, which just throw an exception in the current thread.

withCleanupSession :: GhcMonad m => m a -> m a #

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.

Instances

Monad Ghc # 

Methods

(>>=) :: Ghc a -> (a -> Ghc b) -> Ghc b Source #

(>>) :: Ghc a -> Ghc b -> Ghc b Source #

return :: a -> Ghc a Source #

fail :: String -> Ghc a Source #

Functor Ghc # 

Methods

fmap :: (a -> b) -> Ghc a -> Ghc b Source #

(<$) :: a -> Ghc b -> Ghc a Source #

MonadFix Ghc # 

Methods

mfix :: (a -> Ghc a) -> Ghc a Source #

Applicative Ghc # 

Methods

pure :: a -> Ghc a Source #

(<*>) :: Ghc (a -> b) -> Ghc a -> Ghc b Source #

liftA2 :: (a -> b -> c) -> Ghc a -> Ghc b -> Ghc c Source #

(*>) :: Ghc a -> Ghc b -> Ghc b Source #

(<*) :: Ghc a -> Ghc b -> Ghc a Source #

MonadIO Ghc # 

Methods

liftIO :: IO a -> Ghc a Source #

ExceptionMonad Ghc # 

Methods

gcatch :: Exception e => Ghc a -> (e -> Ghc a) -> Ghc a #

gmask :: ((Ghc a -> Ghc a) -> Ghc b) -> Ghc b #

gbracket :: Ghc a -> (a -> Ghc b) -> (a -> Ghc c) -> Ghc c #

gfinally :: Ghc a -> Ghc b -> Ghc a #

HasDynFlags Ghc # 
GhcMonad Ghc # 

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.

Instances

Monad m => Monad (GhcT m) # 

Methods

(>>=) :: GhcT m a -> (a -> GhcT m b) -> GhcT m b Source #

(>>) :: GhcT m a -> GhcT m b -> GhcT m b Source #

return :: a -> GhcT m a Source #

fail :: String -> GhcT m a Source #

Functor m => Functor (GhcT m) # 

Methods

fmap :: (a -> b) -> GhcT m a -> GhcT m b Source #

(<$) :: a -> GhcT m b -> GhcT m a Source #

Applicative m => Applicative (GhcT m) # 

Methods

pure :: a -> GhcT m a Source #

(<*>) :: GhcT m (a -> b) -> GhcT m a -> GhcT m b Source #

liftA2 :: (a -> b -> c) -> GhcT m a -> GhcT m b -> GhcT m c Source #

(*>) :: GhcT m a -> GhcT m b -> GhcT m b Source #

(<*) :: GhcT m a -> GhcT m b -> GhcT m a Source #

MonadIO m => MonadIO (GhcT m) # 

Methods

liftIO :: IO a -> GhcT m a Source #

ExceptionMonad m => ExceptionMonad (GhcT m) # 

Methods

gcatch :: Exception e => GhcT m a -> (e -> GhcT m a) -> GhcT m a #

gmask :: ((GhcT m a -> GhcT m a) -> GhcT m b) -> GhcT m b #

gbracket :: GhcT m a -> (a -> GhcT m b) -> (a -> GhcT m c) -> GhcT m c #

gfinally :: GhcT m a -> GhcT m b -> GhcT m a #

MonadIO m => HasDynFlags (GhcT m) # 
ExceptionMonad m => GhcMonad (GhcT m) # 

Methods

getSession :: GhcT m HscEnv #

setSession :: HscEnv -> GhcT m () #

class (Functor m, MonadIO m, ExceptionMonad m, HasDynFlags 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 initGhcMonad before any call to the GHC API functions can occur.

Minimal complete definition

getSession, setSession

Methods

getSession :: m HscEnv #

setSession :: HscEnv -> m () #

Instances

data HscEnv #

HscEnv is like Session, except that some of the fields are immutable. An HscEnv is used to compile a single module from plain Haskell source code (after preprocessing) to either C, assembly or C--. Things like the module graph don't change during a single compilation.

Historical note: "hsc" used to be the name of the compiler binary, when there was a separate driver and compiler. To compile a single module, the driver would invoke hsc on the source code... so nowadays we think of hsc as the layer of the compiler that deals with compiling a single module.

runGhc #

Arguments

:: Maybe FilePath

See argument to initGhcMonad.

-> Ghc a

The 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 #

Arguments

:: ExceptionMonad m 
=> Maybe FilePath

See argument to initGhcMonad.

-> GhcT m a

The 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/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.

printException :: GhcMonad m => SourceError -> m () #

Print the error message and all warnings. Useful inside exception handlers. Clears warnings after printing.

handleSourceError #

Arguments

:: ExceptionMonad m 
=> (SourceError -> m a)

exception handler

-> m a

action to perform

-> m a 

Perform the given action and call the exception handler if the action throws a SourceError. See SourceError for more information.

needsTemplateHaskell :: ModuleGraph -> Bool #

Determines whether a set of modules requires Template Haskell.

Note that if the session's DynFlags enabled Template Haskell when depanal was called, then each module in the returned module graph will have Template Haskell enabled whether it is actually needed or not.

Flags and settings

data DynFlags #

Contains not only a collection of GeneralFlags but also a plethora of information relating to the compilation of a single file or GHC session

Constructors

DynFlags 

Fields

data GeneralFlag #

Enumerates the simple on-or-off dynamic flags

Constructors

Opt_DumpToFile

Append dump output to files instead of stdout.

Opt_D_faststring_stats 
Opt_D_dump_minimal_imports 
Opt_DoCoreLinting 
Opt_DoStgLinting 
Opt_DoCmmLinting 
Opt_DoAsmLinting 
Opt_DoAnnotationLinting 
Opt_NoLlvmMangler 
Opt_WarnIsError 
Opt_ShowWarnGroups 
Opt_HideSourcePaths 
Opt_PrintExplicitForalls 
Opt_PrintExplicitKinds 
Opt_PrintExplicitCoercions 
Opt_PrintExplicitRuntimeReps 
Opt_PrintEqualityRelations 
Opt_PrintUnicodeSyntax 
Opt_PrintExpandedSynonyms 
Opt_PrintPotentialInstances 
Opt_PrintTypecheckerElaboration 
Opt_CallArity 
Opt_Strictness 
Opt_LateDmdAnal 
Opt_KillAbsence 
Opt_KillOneShot 
Opt_FullLaziness 
Opt_FloatIn 
Opt_Specialise 
Opt_SpecialiseAggressively 
Opt_CrossModuleSpecialise 
Opt_StaticArgumentTransformation 
Opt_CSE 
Opt_StgCSE 
Opt_LiberateCase 
Opt_SpecConstr 
Opt_SpecConstrKeen 
Opt_DoLambdaEtaExpansion 
Opt_IgnoreAsserts 
Opt_DoEtaReduction 
Opt_CaseMerge 
Opt_CaseFolding 
Opt_UnboxStrictFields 
Opt_UnboxSmallStrictFields 
Opt_DictsCheap 
Opt_EnableRewriteRules 
Opt_Vectorise 
Opt_VectorisationAvoidance 
Opt_RegsGraph 
Opt_RegsIterative 
Opt_PedanticBottoms 
Opt_LlvmTBAA 
Opt_LlvmPassVectorsInRegisters 
Opt_LlvmFillUndefWithGarbage 
Opt_IrrefutableTuples 
Opt_CmmSink 
Opt_CmmElimCommonBlocks 
Opt_OmitYields 
Opt_FunToThunk 
Opt_DictsStrict 
Opt_DmdTxDictSel 
Opt_Loopification 
Opt_CprAnal 
Opt_WorkerWrapper 
Opt_SolveConstantDicts 
Opt_IgnoreInterfacePragmas 
Opt_OmitInterfacePragmas 
Opt_ExposeAllUnfoldings 
Opt_WriteInterface 
Opt_AutoSccsOnIndividualCafs 
Opt_ProfCountEntries 
Opt_Pp 
Opt_ForceRecomp 
Opt_ExcessPrecision 
Opt_EagerBlackHoling 
Opt_NoHsMain 
Opt_SplitObjs 
Opt_SplitSections 
Opt_StgStats 
Opt_HideAllPackages 
Opt_HideAllPluginPackages 
Opt_PrintBindResult 
Opt_Haddock 
Opt_HaddockOptions 
Opt_BreakOnException 
Opt_BreakOnError 
Opt_PrintEvldWithShow 
Opt_PrintBindContents 
Opt_GenManifest 
Opt_EmbedManifest 
Opt_SharedImplib 
Opt_BuildingCabalPackage 
Opt_IgnoreDotGhci 
Opt_GhciSandbox 
Opt_GhciHistory 
Opt_LocalGhciHistory 
Opt_HelpfulErrors 
Opt_DeferTypeErrors 
Opt_DeferTypedHoles 
Opt_DeferOutOfScopeVariables 
Opt_PIC
-fPIC
Opt_PIE
-fPIE
Opt_PICExecutable
-pie
Opt_SccProfilingOn 
Opt_Ticky 
Opt_Ticky_Allocd 
Opt_Ticky_LNE 
Opt_Ticky_Dyn_Thunk 
Opt_RPath 
Opt_RelativeDynlibPaths 
Opt_Hpc 
Opt_FlatCache 
Opt_ExternalInterpreter 
Opt_OptimalApplicativeDo 
Opt_VersionMacros 
Opt_WholeArchiveHsLibs 
Opt_SimplPreInlining 
Opt_ErrorSpans 
Opt_DiagnosticsShowCaret 
Opt_PprCaseAsLet 
Opt_PprShowTicks 
Opt_ShowHoleConstraints 
Opt_ShowLoadedModules 
Opt_SuppressCoercions 
Opt_SuppressVarKinds 
Opt_SuppressModulePrefixes 
Opt_SuppressTypeApplications 
Opt_SuppressIdInfo 
Opt_SuppressUnfoldings 
Opt_SuppressTypeSignatures 
Opt_SuppressUniques 
Opt_SuppressTicks 
Opt_AutoLinkPackages 
Opt_ImplicitImportQualified 
Opt_KeepHiDiffs 
Opt_KeepHcFiles 
Opt_KeepSFiles 
Opt_KeepTmpFiles 
Opt_KeepRawTokenStream 
Opt_KeepLlvmFiles 
Opt_KeepHiFiles 
Opt_KeepOFiles 
Opt_BuildDynamicToo 
Opt_DistrustAllPackages 
Opt_PackageTrust 
Opt_G_NoStateHack 
Opt_G_NoOptCoercion 

data Severity #

Constructors

SevOutput 
SevFatal 
SevInteractive 
SevDump

Log messagse intended for compiler developers No filelinecolumn stuff

SevInfo

Log messages intended for end users. No filelinecolumn stuff.

SevWarning 
SevError

SevWarning and SevError are used for warnings and errors o The message has a filelinecolumn heading, plus "warning:" or "error:", added by mkLocMessags o Output is intended for end users

data HscTarget #

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

Whenever you change the target, also make sure to set ghcLink to something sensible.

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

  • If a program uses Template Haskell the typechecker may try to run code from an imported module. This will fail if no code has been generated for this module. You can use needsTemplateHaskell to detect whether this might be the case and choose to either switch to a different target or avoid typechecking such modules. (The latter may be preferable for security reasons.)

Constructors

HscC

Generate C code.

HscAsm

Generate assembly using the native code generator.

HscLlvm

Generate assembly using the llvm code generator.

HscInterpreted

Generate bytecode. (Requires LinkInMemory)

HscNothing

Don't generate any code. See notes above.

gopt :: GeneralFlag -> DynFlags -> Bool #

Test whether a GeneralFlag 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
MkDepend

ghc -M, see Finder for why we need this

Instances

data GhcLink #

What to do in the link step, if there is one.

Constructors

NoLink

Don't link at all

LinkBinary

Link object code into a binary

LinkInMemory

Use the in-memory dynamic linker (works for both bytecode and object code).

LinkDynLib

Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)

LinkStaticLib

Link objects into a static lib

defaultObjectTarget :: Platform -> HscTarget #

The HscTarget value corresponding to the default way to create object files on the current platform.

getSessionDynFlags :: GhcMonad m => m DynFlags #

Grabs the DynFlags from the Session

setSessionDynFlags :: GhcMonad m => DynFlags -> m [InstalledUnitId] #

Updates both the interactive and program 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.

getProgramDynFlags :: GhcMonad m => m DynFlags #

Returns the program DynFlags.

setProgramDynFlags :: GhcMonad m => DynFlags -> m [InstalledUnitId] #

Sets the program DynFlags. Note: this invalidates the internal cached module graph, causing more work to be done the next time load is called.

setLogAction :: GhcMonad m => LogAction -> LogFinaliser -> m () #

Set the action taken when the compiler produces a message. This can also be accomplished using setProgramDynFlags, but using setLogAction avoids invalidating the cached module graph.

getInteractiveDynFlags :: GhcMonad m => m DynFlags #

Get the DynFlags used to evaluate interactive expressions.

setInteractiveDynFlags :: GhcMonad m => DynFlags -> m () #

Set the DynFlags used to evaluate interactive expressions. Note: this cannot be used for changes to packages. Use setSessionDynFlags, or setProgramDynFlags and then copy the pkgState into the interactive DynFlags.

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 

Fields

Instances

data TargetId #

Constructors

TargetModule ModuleName

A 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.

data Phase #

Instances

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

Loading/compiling the program

depanal #

Arguments

:: GhcMonad m 
=> [ModuleName]

excluded modules

-> Bool

allow duplicate roots

-> m ModuleGraph 

Perform a dependency analysis starting from the current targets and update the session with the new module graph.

Dependency analysis entails parsing the import directives and may therefore require running certain preprocessors.

Note that each ModSummary in the module graph caches its DynFlags. These DynFlags are determined by the current session DynFlags and the OPTIONS and LANGUAGE pragmas of the parsed module. Thus if you want changes to the DynFlags to take effect you need to call this function again.

load :: GhcMonad m => LoadHowMuch -> m SuccessFlag #

Try to load the program. See LoadHowMuch for the different modes.

This function implements the core of GHC's --make mode. It preprocesses, compiles and loads the specified modules, avoiding re-compilation wherever possible. Depending on the target (see hscTarget) compiling and loading may result in files being created on disk.

Calls the defaultWarnErrLogger after each compiling each module, whether successful or not.

Throw a SourceError if errors are encountered before the actual compilation starts (e.g., during dependency analysis). All other errors are reported using the defaultWarnErrLogger.

data LoadHowMuch #

Describes which modules of the module graph need to be loaded.

Constructors

LoadAllTargets

Load all targets and its dependencies.

LoadUpTo ModuleName

Load only the given module and its dependencies.

LoadDependenciesOf ModuleName

Load only the dependencies of the given module, but not the module itself.

data InteractiveImport #

Constructors

IIDecl (ImportDecl RdrName)

Bring the exports of a particular module (filtered by an import decl) into scope

IIModule ModuleName

Bring into scope the entire top-level envt of of this module, including the things imported into it.

type WarnErrLogger = forall m. 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: Before changing the working directory make sure all threads running in the same session have stopped. 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.

A module must be loaded before dependent modules can be typechecked. This always includes generating a ModIface and, depending on the hscTarget, may also include code generation.

This function will always cause recompilation and will always overwrite previous compilation results (potentially files on disk).

coreModule :: DesugaredMod m => m -> ModGuts #

Compiling to Core

data CoreModule #

A CoreModule consists of just the fields of a ModGuts that are needed for the compileToCoreModule interface.

Constructors

CoreModule 

Fields

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.

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. Use topSortModuleGraph and flattenSCC to achieve this.

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

Constructors

ModSummary 

Fields

data ModLocation #

Module Location

Where a module lives on the file system: the actual locations of the .hs, .hi and .o files, if we have them

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.

getModuleGraph :: GhcMonad m => m ModuleGraph #

Get the module dependency graph.

isLoaded :: GhcMonad m => ModuleName -> m Bool #

Return True == module is loaded.

topSortModuleGraph #

Arguments

:: Bool

Drop hi-boot nodes? (see below)

-> [ModSummary] 
-> Maybe ModuleName

Root module name. If Nothing, use the full graph.

-> [SCC ModSummary] 

Topological sort of the module graph

Calculate SCCs of the module graph, possibly dropping the hi-boot nodes The resulting list of strongly-connected-components is in topologically sorted order, starting with the module(s) at the bottom of the dependency graph (ie compile them first) and ending with the ones at the top.

Drop hi-boot nodes (first boolean arg)?

  • False: treat the hi-boot summaries as nodes of the graph, so the graph must be acyclic
  • True: eliminate the hi-boot nodes, and instead pretend the a source-import of Foo is an import of Foo The resulting graph has no hi-boot nodes, but can be cyclic

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

modInfoInstances :: ModuleInfo -> [ClsInst] #

Returns the instances defined by the specified module. Warning: currently unimplemented for package modules.

modInfoSafe :: ModuleInfo -> SafeHaskellMode #

Retrieve module safe haskell mode

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.

findGlobalAnns :: (GhcMonad m, Typeable a) => ([Word8] -> a) -> AnnTarget Name -> m [a] #

data ModIface #

A ModIface plus a ModDetails summarises everything we know about a compiled module. The ModIface is the stuff *before* linking, and can be written out to an interface file. The 'ModDetails is after linking and can be completely recovered from just the ModIface.

When we read an interface file, we also construct a ModIface from it, except that we explicitly make the mi_decls and a few other fields empty; as when reading we consolidate the declarations etc. into a number of indexed maps and environments in the ExternalPackageState.

Constructors

ModIface 

Fields

  • mi_module :: !Module

    Name of the module we are for

  • mi_sig_of :: !(Maybe Module)

    Are we a sig of another mod?

  • mi_iface_hash :: !Fingerprint

    Hash of the whole interface

  • mi_mod_hash :: !Fingerprint

    Hash of the ABI only

  • mi_flag_hash :: !Fingerprint

    Hash of the important flags used when compiling this module

  • mi_orphan :: !WhetherHasOrphans

    Whether this module has orphans

  • mi_finsts :: !WhetherHasFamInst

    Whether this module has family instances. See Note [The type family instance consistency story].

  • mi_hsc_src :: !HscSource

    Boot? Signature?

  • mi_deps :: Dependencies

    The dependencies of the module. This is consulted for directly-imported modules, but not for anything else (hence lazy)

  • mi_usages :: [Usage]

    Usages; kept sorted so that it's easy to decide whether to write a new iface file (changing usages doesn't affect the hash of this module) NOT STRICT! we read this field lazily from the interface file It is *only* consulted by the recompilation checker

  • mi_exports :: ![IfaceExport]

    Exports Kept sorted by (mod,occ), to make version comparisons easier Records the modules that are the declaration points for things exported by this module, and the OccNames of those things

  • mi_exp_hash :: !Fingerprint

    Hash of export list

  • mi_used_th :: !Bool

    Module required TH splices when it was compiled. This disables recompilation avoidance (see #481).

  • mi_fixities :: [(OccName, Fixity)]

    Fixities NOT STRICT! we read this field lazily from the interface file

  • mi_warns :: Warnings

    Warnings NOT STRICT! we read this field lazily from the interface file

  • mi_anns :: [IfaceAnnotation]

    Annotations NOT STRICT! we read this field lazily from the interface file

  • mi_decls :: [(Fingerprint, IfaceDecl)]

    Type, class and variable declarations The hash of an Id changes if its fixity or deprecations change (as well as its type of course) Ditto data constructors, class operations, except that the hash of the parent class/tycon changes

  • mi_globals :: !(Maybe GlobalRdrEnv)

    Binds all the things defined at the top level in the original source code for this module. which is NOT the same as mi_exports, nor mi_decls (which may contains declarations for things not actually defined by the user). Used for GHCi and for inspecting the contents of modules via the GHC API only.

    (We need the source file to figure out the top-level environment, if we didn't compile this module from source then this field contains Nothing).

    Strictly speaking this field should live in the HomeModInfo, but that leads to more plumbing.

  • mi_insts :: [IfaceClsInst]

    Sorted class instance

  • mi_fam_insts :: [IfaceFamInst]

    Sorted family instances

  • mi_rules :: [IfaceRule]

    Sorted rules

  • mi_orphan_hash :: !Fingerprint

    Hash for orphan rules, class and family instances, and vectorise pragmas combined

  • mi_vect_info :: !IfaceVectInfo

    Vectorisation information

  • mi_warn_fn :: OccName -> Maybe WarningTxt

    Cached lookup for mi_warns

  • mi_fix_fn :: OccName -> Maybe Fixity

    Cached lookup for mi_fixities

  • mi_hash_fn :: OccName -> Maybe (OccName, Fingerprint)

    Cached lookup for mi_decls. The Nothing in mi_hash_fn means that the thing isn't in decls. It's useful to know that when seeing if we are up to date wrt. the old interface. The OccName is the parent of the name, if it has one.

  • mi_hpc :: !AnyHpcUsage

    True if this program uses Hpc at any point in the program.

  • mi_trust :: !IfaceTrustInfo

    Safe Haskell Trust information for this module.

  • mi_trust_pkg :: !Bool

    Do we require the package this module resides in be trusted to trust this module? This is used for the situation where a module is Safe (so doesn't require the package be trusted itself) but imports some trustworthy modules from its own package (which does require its own package be trusted). See Note [RnNames . Trust Own Package]

  • mi_complete_sigs :: [IfaceCompleteMatch]
     

Instances

Querying the environment

Printing

data PrintUnqualified #

When printing code that contains original names, we need to map the original names back to something the user understands. This is the purpose of the triple of functions that gets passed around when rendering SDoc.

Interactive evaluation

Executing statements

execStmt #

Arguments

:: GhcMonad m 
=> String

a statement (bind or expression)

-> ExecOptions 
-> m ExecResult 

Run a statement in the current interactive context.

data ExecOptions #

Constructors

ExecOptions 

Fields

execOptions :: ExecOptions #

default ExecOptions

Adding new declarations

runDecls :: GhcMonad m => String -> m [Name] #

runDeclsWithLocation :: GhcMonad m => String -> Int -> String -> m [Name] #

Run some declarations and return any user-visible names that were brought into scope.

Get/set the current context

setContext :: GhcMonad m => [InteractiveImport] -> m () #

Set the interactive evaluation context.

(setContext imports) sets the ic_imports field (which in turn determines what is in scope at the prompt) to imports, and constructs the ic_rn_glb_env environment to reflect it.

We retain in scope all the things defined at the prompt, and kept in ic_tythings. (Indeed, they shadow stuff from ic_imports.)

getContext :: GhcMonad m => m [InteractiveImport] #

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.

setGHCiMonad :: GhcMonad m => String -> m () #

Set the monad GHCi lifts user statements into.

Checks that a type (in string form) is an instance of the GHC.GHCi.GHCiSandboxIO type class. Sets it to be the GHCi monad if it is, throws an error otherwise.

getGHCiMonad :: GhcMonad m => m Name #

Get the monad GHCi lifts user statements into.

Inspecting the current context

getBindings :: GhcMonad m => m [TyThing] #

Return the bindings for the current interactive session.

getInsts :: GhcMonad m => m ([ClsInst], [FamInst]) #

Return the instances for the current interactive session.

findModule :: GhcMonad m => ModuleName -> Maybe FastString -> m Module #

Takes a ModuleName and possibly a UnitId, and consults the filesystem and package database to find the corresponding Module, using the algorithm that is used for an import declaration.

lookupModule :: GhcMonad m => ModuleName -> Maybe FastString -> m Module #

Like findModule, but differs slightly when the module refers to a source file, and the file has not been loaded via load. In this case, findModule will throw an error (module not loaded), but lookupModule will check to see whether the module can also be found in a package, and if so, that package Module will be returned. If not, the usual module-not-found error will be thrown.

isModuleTrusted :: GhcMonad m => Module -> m Bool #

Check that a module is safe to import (according to Safe Haskell).

We return True to indicate the import is safe and False otherwise although in the False case an error may be thrown first.

moduleTrustReqs :: GhcMonad m => Module -> m (Bool, Set InstalledUnitId) #

Return if a module is trusted and the pkgs it depends on to be trusted.

getNamesInScope :: GhcMonad m => m [Name] #

Returns all names in scope in the current interactive context

getRdrNamesInScope :: GhcMonad m => m [RdrName] #

Returns all RdrNames in scope in the current interactive context, excluding any that are internally-generated.

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 => Bool -> Name -> m (Maybe (TyThing, Fixity, [ClsInst], [FamInst])) #

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)

getNameToInstancesIndex :: GhcMonad m => m (Messages, Maybe (NameEnv ([ClsInst], [FamInst]))) #

Retrieve all type and family instances in the environment, indexed by Name. Each name's lists will contain every instance in which that name is mentioned in the instance head.

Inspecting types and kinds

exprType :: GhcMonad m => TcRnExprMode -> String -> m Type #

Get the type of an expression Returns the type as described by TcRnExprMode

data TcRnExprMode #

How should we infer a type? See Note [TcRnExprMode]

Constructors

TM_Inst

Instantiate the type fully (:type)

TM_NoInst

Do not instantiate the type (:type +v)

TM_Default

Default the type eagerly (:type +d)

typeKind :: GhcMonad m => Bool -> String -> m (Type, Kind) #

Get the kind of a type

Looking up a Name

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.

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.

Compiling expressions

parseExpr :: GhcMonad m => String -> m (LHsExpr RdrName) #

Parse an expression, the parsed expression can be further processed and passed to compileParsedExpr.

compileExpr :: GhcMonad m => String -> m HValue #

Compile an expression, run it and deliver the resulting HValue.

dynCompileExpr :: GhcMonad m => String -> m Dynamic #

Compile an expression, run it and return the result as a Dynamic.

compileExprRemote :: GhcMonad m => String -> m ForeignHValue #

Compile an expression, run it and deliver the resulting HValue.

compileParsedExprRemote :: GhcMonad m => LHsExpr RdrName -> m ForeignHValue #

Compile an parsed expression (before renaming), run it and deliver the resulting HValue.

Other

isStmt :: DynFlags -> String -> Bool #

Returns True if passed string is a statement.

hasImport :: DynFlags -> String -> Bool #

Returns True if passed string has an import declaration.

isImport :: DynFlags -> String -> Bool #

Returns True if passed string is an import declaration.

isDecl :: DynFlags -> String -> Bool #

Returns True if passed string is a declaration but not a splice.

The debugger

data History #

obtainTermFromVal :: GhcMonad m => Int -> Bool -> Type -> a -> m Term #

data ModBreaks #

All the information about the breakpoints for a module

Constructors

ModBreaks 

Fields

type BreakIndex = Int #

Breakpoint index

back :: GhcMonad m => Int -> m ([Name], Int, SrcSpan, String) #

forward :: GhcMonad m => Int -> m ([Name], Int, SrcSpan, String) #

Abstract syntax elements

Packages

data UnitId #

A unit identifier identifies a (possibly partially) instantiated library. It is primarily used as part of Module, which in turn is used in Name, which is used to give names to entities when typechecking.

There are two possible forms for a UnitId. It can be a DefiniteUnitId, in which case we just have a string that uniquely identifies some fully compiled, installed library we have on disk. However, when we are typechecking a library with missing holes, we may need to instantiate a library on the fly (in which case we don't have any on-disk representation.) In that case, you have an IndefiniteUnitId, which explicitly records the instantiation, so that we can substitute over it.

Instances

Eq UnitId # 

Methods

(==) :: UnitId -> UnitId -> Bool #

(/=) :: UnitId -> UnitId -> Bool #

Data UnitId # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UnitId -> c UnitId Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c UnitId Source #

toConstr :: UnitId -> Constr Source #

dataTypeOf :: UnitId -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c UnitId) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c UnitId) Source #

gmapT :: (forall b. Data b => b -> b) -> UnitId -> UnitId Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UnitId -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UnitId -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> UnitId -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> UnitId -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> UnitId -> m UnitId Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UnitId -> m UnitId Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UnitId -> m UnitId Source #

Ord UnitId # 
Show UnitId # 
NFData UnitId # 

Methods

rnf :: UnitId -> () Source #

Outputable UnitId # 

Methods

ppr :: UnitId -> SDoc #

pprPrec :: Rational -> UnitId -> SDoc #

Uniquable UnitId # 

Methods

getUnique :: UnitId -> Unique #

Binary UnitId # 

Methods

put_ :: BinHandle -> UnitId -> IO () #

put :: BinHandle -> UnitId -> IO (Bin * UnitId) #

get :: BinHandle -> IO UnitId #

DbUnitIdModuleRep InstalledUnitId ComponentId UnitId ModuleName Module # 

Modules

data Module #

A Module is a pair of a UnitId and a ModuleName.

Module variables (i.e. H) which can be instantiated to a specific module at some later point in time are represented with moduleUnitId set to holeUnitId (this allows us to avoid having to make moduleUnitId a partial operation.)

Instances

Eq Module # 

Methods

(==) :: Module -> Module -> Bool #

(/=) :: Module -> Module -> Bool #

Data Module # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Module -> c Module Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Module Source #

toConstr :: Module -> Constr Source #

dataTypeOf :: Module -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c Module) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Module) Source #

gmapT :: (forall b. Data b => b -> b) -> Module -> Module Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Module -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Module -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Module -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Module -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Module -> m Module Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Module -> m Module Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Module -> m Module Source #

Ord Module # 
NFData Module # 

Methods

rnf :: Module -> () Source #

Outputable Module # 

Methods

ppr :: Module -> SDoc #

pprPrec :: Rational -> Module -> SDoc #

Uniquable Module # 

Methods

getUnique :: Module -> Unique #

Binary Module # 

Methods

put_ :: BinHandle -> Module -> IO () #

put :: BinHandle -> Module -> IO (Bin * Module) #

get :: BinHandle -> IO Module #

DbUnitIdModuleRep InstalledUnitId ComponentId UnitId ModuleName Module # 

data ModuleName #

A ModuleName is essentially a simple string, e.g. Data.List.

Instances

Eq ModuleName # 
Data ModuleName # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> ModuleName -> c ModuleName Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c ModuleName Source #

toConstr :: ModuleName -> Constr Source #

dataTypeOf :: ModuleName -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c ModuleName) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c ModuleName) Source #

gmapT :: (forall b. Data b => b -> b) -> ModuleName -> ModuleName Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> ModuleName -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> ModuleName -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> ModuleName -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> ModuleName -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> ModuleName -> m ModuleName Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> ModuleName -> m ModuleName Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> ModuleName -> m ModuleName Source #

Ord ModuleName # 
NFData ModuleName # 

Methods

rnf :: ModuleName -> () Source #

BinaryStringRep ModuleName # 
Outputable ModuleName # 
Uniquable ModuleName # 
Binary ModuleName # 
DbUnitIdModuleRep InstalledUnitId ComponentId UnitId ModuleName Module # 

Names

data Name #

A unique, unambiguous name for something, containing information about where that thing originated.

Instances

Eq Name # 

Methods

(==) :: Name -> Name -> Bool #

(/=) :: Name -> Name -> Bool #

Data Name # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Name -> c Name Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Name Source #

toConstr :: Name -> Constr Source #

dataTypeOf :: Name -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c Name) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Name) Source #

gmapT :: (forall b. Data b => b -> b) -> Name -> Name Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Name -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Name -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Name -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Name -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Name -> m Name Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Name -> m Name Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Name -> m Name Source #

Ord Name # 

Methods

compare :: Name -> Name -> Ordering #

(<) :: Name -> Name -> Bool #

(<=) :: Name -> Name -> Bool #

(>) :: Name -> Name -> Bool #

(>=) :: Name -> Name -> Bool #

max :: Name -> Name -> Name #

min :: Name -> Name -> Name #

NFData Name # 

Methods

rnf :: Name -> () Source #

OutputableBndr Name # 
Outputable Name # 

Methods

ppr :: Name -> SDoc #

pprPrec :: Rational -> Name -> SDoc #

Uniquable Name # 

Methods

getUnique :: Name -> Unique #

Binary Name #

Assumes that the Name is a non-binding one. See putIfaceTopBndr and getIfaceTopBndr for serializing binding Names. See UserData for the rationale for this distinction.

Methods

put_ :: BinHandle -> Name -> IO () #

put :: BinHandle -> Name -> IO (Bin * Name) #

get :: BinHandle -> IO Name #

HasOccName Name # 

Methods

occName :: Name -> OccName #

NamedThing Name # 
type PostRn Name ty # 
type PostRn Name ty = ty
type PostTc Name ty # 

pprParenSymName :: NamedThing a => a -> SDoc #

print a NamedThing, adding parentheses if the name is an operator.

class NamedThing a where #

A class allowing convenient access to the Name of various datatypes

Minimal complete definition

getName

Methods

getOccName :: a -> OccName #

getName :: a -> Name #

data RdrName #

Reader Name

Do not use the data constructors of RdrName directly: prefer the family of functions that creates them, such as mkRdrUnqual

  • Note: A Located RdrName will only have API Annotations if it is a compound one, e.g.
`bar`
( ~ )

Constructors

Unqual OccName

Unqualified name

Used for ordinary, unqualified occurrences, e.g. x, y or Foo. Create such a RdrName with mkRdrUnqual

Qual ModuleName OccName

Qualified name

A 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

Instances

Eq RdrName # 

Methods

(==) :: RdrName -> RdrName -> Bool #

(/=) :: RdrName -> RdrName -> Bool #

Data RdrName # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> RdrName -> c RdrName Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c RdrName Source #

toConstr :: RdrName -> Constr Source #

dataTypeOf :: RdrName -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c RdrName) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c RdrName) Source #

gmapT :: (forall b. Data b => b -> b) -> RdrName -> RdrName Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> RdrName -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> RdrName -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> RdrName -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> RdrName -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> RdrName -> m RdrName Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> RdrName -> m RdrName Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> RdrName -> m RdrName Source #

Ord RdrName # 
OutputableBndr RdrName # 
Outputable RdrName # 

Methods

ppr :: RdrName -> SDoc #

pprPrec :: Rational -> RdrName -> SDoc #

HasOccName RdrName # 

Methods

occName :: RdrName -> OccName #

type PostRn RdrName ty # 
type PostTc RdrName ty # 

Identifiers

type Id = Var #

Identifier

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.

isExportedId :: Var -> Bool #

isExportedIdVar means "don't throw this away"

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 :: Var -> Bool #

Returns true if an application to n args would diverge

recordSelectorTyCon :: Id -> RecSelParent #

If the Id is that for a record selector, extract the sel_tycon. Panic otherwise.

Type constructors

data TyCon #

TyCons represent 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 *

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

Instances

Eq TyCon # 

Methods

(==) :: TyCon -> TyCon -> Bool #

(/=) :: TyCon -> TyCon -> Bool #

Data TyCon # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> TyCon -> c TyCon Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c TyCon Source #

toConstr :: TyCon -> Constr Source #

dataTypeOf :: TyCon -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c TyCon) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c TyCon) Source #

gmapT :: (forall b. Data b => b -> b) -> TyCon -> TyCon Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> TyCon -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> TyCon -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> TyCon -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> TyCon -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> TyCon -> m TyCon Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> TyCon -> m TyCon Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> TyCon -> m TyCon Source #

Outputable TyCon # 

Methods

ppr :: TyCon -> SDoc #

pprPrec :: Rational -> TyCon -> SDoc #

Uniquable TyCon # 

Methods

getUnique :: TyCon -> Unique #

NamedThing TyCon # 

tyConTyVars :: TyCon -> [TyVar] #

TyVar binders

tyConDataCons :: TyCon -> [DataCon] #

As tyConDataCons_maybe, but returns the empty list of constructors if no constructors could be found

tyConArity :: TyCon -> Arity #

Arity

isClassTyCon :: TyCon -> Bool #

Is this TyCon that for a class instance?

isTypeSynonymTyCon :: TyCon -> Bool #

Is this a TyCon representing a regular H98 type synonym (type)?

isTypeFamilyTyCon :: TyCon -> Bool #

Is this a synonym TyCon that can have may have further instances appear?

isNewTyCon :: TyCon -> Bool #

Is this TyCon that for a newtype

isPrimTyCon :: TyCon -> Bool #

Does this TyCon represent something that cannot be defined in Haskell?

isFamilyTyCon :: TyCon -> Bool #

Is this a TyCon, synonym or otherwise, that defines a family?

isOpenFamilyTyCon :: TyCon -> Bool #

Is this a TyCon, synonym or otherwise, that defines a family with instances?

isOpenTypeFamilyTyCon :: TyCon -> Bool #

Is this an open type family TyCon?

tyConClass_maybe :: TyCon -> Maybe Class #

If this TyCon is that for a class instance, return the class it is for. Otherwise returns Nothing

synTyConRhs_maybe :: TyCon -> Maybe Type #

Extract the information pertaining to the right hand side of a type synonym (type) declaration.

synTyConDefn_maybe :: TyCon -> Maybe ([TyVar], Type) #

Extract the TyVars bound by a vanilla type synonym and the corresponding (unsubstituted) right hand side.

tyConKind :: TyCon -> Kind #

Kind of this TyCon

Type variables

type TyVar = Var #

Type or kind Variable

Data constructors

data DataCon #

A data constructor

Instances

Eq DataCon # 

Methods

(==) :: DataCon -> DataCon -> Bool #

(/=) :: DataCon -> DataCon -> Bool #

Data DataCon # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> DataCon -> c DataCon Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c DataCon Source #

toConstr :: DataCon -> Constr Source #

dataTypeOf :: DataCon -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c DataCon) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c DataCon) Source #

gmapT :: (forall b. Data b => b -> b) -> DataCon -> DataCon Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> DataCon -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> DataCon -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> DataCon -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> DataCon -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> DataCon -> m DataCon Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> DataCon -> m DataCon Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> DataCon -> m DataCon Source #

OutputableBndr DataCon # 
Outputable DataCon # 

Methods

ppr :: DataCon -> SDoc #

pprPrec :: Rational -> DataCon -> SDoc #

Uniquable DataCon # 

Methods

getUnique :: DataCon -> Unique #

NamedThing DataCon # 

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

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

dataConUserType :: DataCon -> Type #

The user-declared type of the data constructor in the nice-to-read form:

T :: forall a b. a -> b -> T [a]

rather than:

T :: forall a c. forall b. (c~[a]) => a -> b -> T c

NB: If the constructor is part of a data instance, the result type mentions the family tycon, not the internal one.

dataConSrcBangs :: DataCon -> [HsSrcBang] #

Strictness/unpack annotations, from user; or, for imported DataCons, from the interface file The list is in one-to-one correspondence with the arity of the DataCon

Classes

data Class #

Instances

Eq Class # 

Methods

(==) :: Class -> Class -> Bool #

(/=) :: Class -> Class -> Bool #

Data Class # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Class -> c Class Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Class Source #

toConstr :: Class -> Constr Source #

dataTypeOf :: Class -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c Class) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Class) Source #

gmapT :: (forall b. Data b => b -> b) -> Class -> Class Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Class -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Class -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Class -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Class -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Class -> m Class Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Class -> m Class Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Class -> m Class Source #

Outputable Class # 

Methods

ppr :: Class -> SDoc #

pprPrec :: Rational -> Class -> SDoc #

Uniquable Class # 

Methods

getUnique :: Class -> Unique #

NamedThing Class # 

Instances

data ClsInst #

A type-class instance. Note that there is some tricky laziness at work here. See Note [ClsInst laziness and the rough-match fields] for more details.

Instances

Data ClsInst # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> ClsInst -> c ClsInst Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c ClsInst Source #

toConstr :: ClsInst -> Constr Source #

dataTypeOf :: ClsInst -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c ClsInst) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c ClsInst) Source #

gmapT :: (forall b. Data b => b -> b) -> ClsInst -> ClsInst Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> ClsInst -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> ClsInst -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> ClsInst -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> ClsInst -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> ClsInst -> m ClsInst Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> ClsInst -> m ClsInst Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> ClsInst -> m ClsInst Source #

Outputable ClsInst # 

Methods

ppr :: ClsInst -> SDoc #

pprPrec :: Rational -> ClsInst -> SDoc #

NamedThing ClsInst # 

pprFamInst :: FamInst -> SDoc #

Pretty-prints a FamInst (type/data family instance) with its defining location.

Types and Kinds

data Type #

Instances

Data Type # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Type -> c Type Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Type Source #

toConstr :: Type -> Constr Source #

dataTypeOf :: Type -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c Type) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Type) Source #

gmapT :: (forall b. Data b => b -> b) -> Type -> Type Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Type -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Type -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Type -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Type -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Type -> m Type Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Type -> m Type Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Type -> m Type Source #

Outputable Type # 

Methods

ppr :: Type -> SDoc #

pprPrec :: Rational -> Type -> SDoc #

splitForAllTys :: Type -> ([TyVar], Type) #

Take a ForAllTy apart, returning the list of tyvars and the result type. This always succeeds, even if it returns only an empty list. Note that the result type returned may have free variables that were bound by a forall.

funResultTy :: Type -> Type #

Extract the function result type and panic if that is not possible

type Kind = Type #

The key type representing kinds in the compiler.

type PredType = Type #

A type of the form p of kind Constraint represents a value whose type is the Haskell predicate p, where a predicate is what occurs before the => in a Haskell type.

We use PredType as documentation to mark those types that we guarantee to have this kind.

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"

type ThetaType = [PredType] #

A collection of PredTypes

Entities

data TyThing #

A global typecheckable-thing, essentially anything that has a name. Not to be confused with a TcTyThing, which is also a typecheckable thing but in the *local* context. See TcEnv for how to retrieve a TyThing given a Name.

Syntax

module HsSyn

Fixities

data FixityDirection #

Constructors

InfixL 
InfixR 
InfixN 

Instances

Eq FixityDirection # 
Data FixityDirection # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> FixityDirection -> c FixityDirection Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c FixityDirection Source #

toConstr :: FixityDirection -> Constr Source #

dataTypeOf :: FixityDirection -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c FixityDirection) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c FixityDirection) Source #

gmapT :: (forall b. Data b => b -> b) -> FixityDirection -> FixityDirection Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> FixityDirection -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> FixityDirection -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> FixityDirection -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> FixityDirection -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> FixityDirection -> m FixityDirection Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> FixityDirection -> m FixityDirection Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> FixityDirection -> m FixityDirection Source #

Outputable FixityDirection # 
Binary FixityDirection # 

data LexicalFixity #

Captures the fixity of declarations as they are parsed. This is not necessarily the same as the fixity declaration, as the normal fixity may be overridden using parens or backticks.

Constructors

Prefix 
Infix 

Instances

Eq LexicalFixity # 
Data LexicalFixity # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> LexicalFixity -> c LexicalFixity Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c LexicalFixity Source #

toConstr :: LexicalFixity -> Constr Source #

dataTypeOf :: LexicalFixity -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c LexicalFixity) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c LexicalFixity) Source #

gmapT :: (forall b. Data b => b -> b) -> LexicalFixity -> LexicalFixity Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> LexicalFixity -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> LexicalFixity -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> LexicalFixity -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> LexicalFixity -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> LexicalFixity -> m LexicalFixity Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> LexicalFixity -> m LexicalFixity Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> LexicalFixity -> m LexicalFixity Source #

Outputable LexicalFixity # 

Source locations

noSrcLoc :: SrcLoc #

Built-in "bad" SrcLoc values for particular locations

srcLocFile :: RealSrcLoc -> FastString #

Gives the filename of the RealSrcLoc

srcLocLine :: RealSrcLoc -> Int #

Raises an error when used on a "bad" SrcLoc

srcLocCol :: RealSrcLoc -> Int #

Raises an error when used on a "bad" SrcLoc

data SrcSpan #

Source Span

A SrcSpan identifies either a specific portion of a text file or a human-readable description of a location.

Instances

Eq SrcSpan # 

Methods

(==) :: SrcSpan -> SrcSpan -> Bool #

(/=) :: SrcSpan -> SrcSpan -> Bool #

Data SrcSpan # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> SrcSpan -> c SrcSpan Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c SrcSpan Source #

toConstr :: SrcSpan -> Constr Source #

dataTypeOf :: SrcSpan -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c SrcSpan) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c SrcSpan) Source #

gmapT :: (forall b. Data b => b -> b) -> SrcSpan -> SrcSpan Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> SrcSpan -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> SrcSpan -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> SrcSpan -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> SrcSpan -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> SrcSpan -> m SrcSpan Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> SrcSpan -> m SrcSpan Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> SrcSpan -> m SrcSpan Source #

Ord SrcSpan # 
Show SrcSpan # 
NFData SrcSpan # 

Methods

rnf :: SrcSpan -> () Source #

Outputable SrcSpan # 

Methods

ppr :: SrcSpan -> SDoc #

pprPrec :: Rational -> SrcSpan -> SDoc #

ToJson SrcSpan # 

Methods

json :: SrcSpan -> JsonDoc #

Binary SrcSpan # 
Binary a => Binary (GenLocated SrcSpan a) # 

data RealSrcSpan #

A RealSrcSpan 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.

Real Source Span

Instances

Eq RealSrcSpan # 
Data RealSrcSpan # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> RealSrcSpan -> c RealSrcSpan Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c RealSrcSpan Source #

toConstr :: RealSrcSpan -> Constr Source #

dataTypeOf :: RealSrcSpan -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c RealSrcSpan) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c RealSrcSpan) Source #

gmapT :: (forall b. Data b => b -> b) -> RealSrcSpan -> RealSrcSpan Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> RealSrcSpan -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> RealSrcSpan -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> RealSrcSpan -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> RealSrcSpan -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> RealSrcSpan -> m RealSrcSpan Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> RealSrcSpan -> m RealSrcSpan Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> RealSrcSpan -> m RealSrcSpan Source #

Ord RealSrcSpan # 
Show RealSrcSpan # 
Outputable RealSrcSpan # 
ToJson RealSrcSpan # 

Methods

json :: RealSrcSpan -> JsonDoc #

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 #

Built-in "bad" SrcSpans for common sources of location uncertainty

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

Located

data GenLocated l e #

We attach SrcSpans to lots of things, so let's have a datatype for it.

Constructors

L l e 

Instances

Functor (GenLocated l) # 

Methods

fmap :: (a -> b) -> GenLocated l a -> GenLocated l b Source #

(<$) :: a -> GenLocated l b -> GenLocated l a Source #

Foldable (GenLocated l) # 

Methods

fold :: Monoid m => GenLocated l m -> m Source #

foldMap :: Monoid m => (a -> m) -> GenLocated l a -> m Source #

foldr :: (a -> b -> b) -> b -> GenLocated l a -> b Source #

foldr' :: (a -> b -> b) -> b -> GenLocated l a -> b Source #

foldl :: (b -> a -> b) -> b -> GenLocated l a -> b Source #

foldl' :: (b -> a -> b) -> b -> GenLocated l a -> b Source #

foldr1 :: (a -> a -> a) -> GenLocated l a -> a Source #

foldl1 :: (a -> a -> a) -> GenLocated l a -> a Source #

toList :: GenLocated l a -> [a] Source #

null :: GenLocated l a -> Bool Source #

length :: GenLocated l a -> Int Source #

elem :: Eq a => a -> GenLocated l a -> Bool Source #

maximum :: Ord a => GenLocated l a -> a Source #

minimum :: Ord a => GenLocated l a -> a Source #

sum :: Num a => GenLocated l a -> a Source #

product :: Num a => GenLocated l a -> a Source #

Traversable (GenLocated l) # 

Methods

traverse :: Applicative f => (a -> f b) -> GenLocated l a -> f (GenLocated l b) Source #

sequenceA :: Applicative f => GenLocated l (f a) -> f (GenLocated l a) Source #

mapM :: Monad m => (a -> m b) -> GenLocated l a -> m (GenLocated l b) Source #

sequence :: Monad m => GenLocated l (m a) -> m (GenLocated l a) Source #

(Eq e, Eq l) => Eq (GenLocated l e) # 

Methods

(==) :: GenLocated l e -> GenLocated l e -> Bool #

(/=) :: GenLocated l e -> GenLocated l e -> Bool #

(Data e, Data l) => Data (GenLocated l e) # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> GenLocated l e -> c (GenLocated l e) Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (GenLocated l e) Source #

toConstr :: GenLocated l e -> Constr Source #

dataTypeOf :: GenLocated l e -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c (GenLocated l e)) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d a. (Data d, Data a) => c (t d a)) -> Maybe (c (GenLocated l e)) Source #

gmapT :: (forall b. Data b => b -> b) -> GenLocated l e -> GenLocated l e Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> GenLocated l e -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> GenLocated l e -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> GenLocated l e -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> GenLocated l e -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> GenLocated l e -> m (GenLocated l e) Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> GenLocated l e -> m (GenLocated l e) Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> GenLocated l e -> m (GenLocated l e) Source #

(Ord e, Ord l) => Ord (GenLocated l e) # 

Methods

compare :: GenLocated l e -> GenLocated l e -> Ordering #

(<) :: GenLocated l e -> GenLocated l e -> Bool #

(<=) :: GenLocated l e -> GenLocated l e -> Bool #

(>) :: GenLocated l e -> GenLocated l e -> Bool #

(>=) :: GenLocated l e -> GenLocated l e -> Bool #

max :: GenLocated l e -> GenLocated l e -> GenLocated l e #

min :: GenLocated l e -> GenLocated l e -> GenLocated l e #

(Outputable l, Outputable e) => Outputable (GenLocated l e) # 

Methods

ppr :: GenLocated l e -> SDoc #

pprPrec :: Rational -> GenLocated l e -> SDoc #

Binary a => Binary (GenLocated SrcSpan a) # 
NamedThing e => NamedThing (GenLocated l e) # 

Constructing Located

noLoc :: e -> Located e #

Deconstructing Located

getLoc :: GenLocated l e -> l #

unLoc :: GenLocated l 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

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 #

Alternative strategies for ordering SrcSpans

leftmost_largest :: SrcSpan -> SrcSpan -> Ordering #

Alternative strategies for ordering SrcSpans

rightmost :: SrcSpan -> SrcSpan -> Ordering #

Alternative strategies for ordering SrcSpans

spans :: SrcSpan -> (Int, Int) -> Bool #

Determines whether a span encloses a given line and column index

isSubspanOf #

Arguments

:: SrcSpan

The span that may be enclosed by the other

-> SrcSpan

The span it may be enclosed by

-> Bool 

Determines whether a span is enclosed by another one

Exceptions

data GhcException #

GHC's own exception type error messages all take the form:

     location: error
 

If the location is on the command line, or in GHC itself, then location="ghc". All of the error types below correspond to a location of "ghc", except for ProgramError (where the string is assumed to contain a location already, so we don't print one).

Constructors

Signal Int

Some other fatal signal (SIGHUP,SIGTERM)

UsageError String

Prints the short usage msg after the error

CmdLineError String

A problem with the command line arguments, but don't print usage.

Panic String

The impossible happened.

PprPanic String SDoc 
Sorry String

The user tickled something that's known not to work yet, but we're not counting it as a bug.

PprSorry String SDoc 
InstallationError String

An installation problem.

ProgramError String

An error in the user's code, probably.

PprProgramError String SDoc 

showGhcException :: GhcException -> ShowS #

Append a description of the given exception to this string.

Note that this uses unsafeGlobalDynFlags, which may have some uninitialized fields if invoked before initGhcMonad has been called. If the error message to be printed includes a pretty-printer document which forces one of these fields this call may bottom.

Token stream manipulations

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 :: RealSrcLoc -> 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.

Pure interface to the parser

parser #

Arguments

:: String

Haskell module source text (full Unicode is supported)

-> DynFlags

the flags

-> FilePath

the filename (for source locations)

-> Either ErrorMessages (WarningMessages, Located (HsModule RdrName)) 

A pure interface to the module parser.

API Annotations

data AnnKeywordId #

API Annotations exist so that tools can perform source to source conversions of Haskell code. They are used to keep track of the various syntactic keywords that are not captured in the existing AST.

The annotations, together with original source comments are made available in the pm_annotations field of ParsedModule. Comments are only retained if Opt_KeepRawTokenStream is set in DynFlags before parsing.

The wiki page describing this feature is https://ghc.haskell.org/trac/ghc/wiki/ApiAnnotations

Note: in general the names of these are taken from the corresponding token, unless otherwise noted See note [Api annotations] above for details of the usage

Constructors

AnnAnyclass 
AnnAs 
AnnAt 
AnnBang

!

AnnBackquote

'`'

AnnBy 
AnnCase

case or lambda case

AnnClass 
AnnClose

'#)' or '#-}' etc

AnnCloseB

'|)'

AnnCloseBU

'|)', unicode variant

AnnCloseC

'}'

AnnCloseQ

'|]'

AnnCloseQU

'|]', unicode variant

AnnCloseP

')'

AnnCloseS

']'

AnnColon 
AnnComma

as a list separator

AnnCommaTuple

in a RdrName for a tuple

AnnDarrow

'=>'

AnnDarrowU

'=>', unicode variant

AnnData 
AnnDcolon

'::'

AnnDcolonU

'::', unicode variant

AnnDefault 
AnnDeriving 
AnnDo 
AnnDot

.

AnnDotdot

'..'

AnnElse 
AnnEqual 
AnnExport 
AnnFamily 
AnnForall 
AnnForallU

Unicode variant

AnnForeign 
AnnFunId

for function name in matches where there are multiple equations for the function.

AnnGroup 
AnnHeader

for CType

AnnHiding 
AnnIf 
AnnImport 
AnnIn 
AnnInfix

'infix' or 'infixl' or 'infixr'

AnnInstance 
AnnLam 
AnnLarrow

'<-'

AnnLarrowU

'<-', unicode variant

AnnLet 
AnnMdo 
AnnMinus

-

AnnModule 
AnnNewtype 
AnnName

where a name loses its location in the AST, this carries it

AnnOf 
AnnOpen

'(#' or '{-# LANGUAGE' etc

AnnOpenB

'(|'

AnnOpenBU

'(|', unicode variant

AnnOpenC

'{'

AnnOpenE

'[e|' or '[e||'

AnnOpenEQ

'[|'

AnnOpenEQU

'[|', unicode variant

AnnOpenP

'('

AnnOpenPE

'$('

AnnOpenPTE

'$$('

AnnOpenS

'['

AnnPackageName 
AnnPattern 
AnnProc 
AnnQualified 
AnnRarrow

'->'

AnnRarrowU

'->', unicode variant

AnnRec 
AnnRole 
AnnSafe 
AnnSemi

';'

AnnSimpleQuote

'''

AnnSignature 
AnnStatic

static

AnnStock 
AnnThen 
AnnThIdSplice

$

AnnThIdTySplice

$$

AnnThTyQuote

double '''

AnnTilde

'~'

AnnTildehsh

~#

AnnType 
AnnUnit

'()' for types

AnnUsing 
AnnVal

e.g. INTEGER

AnnValStr

String value, will need quotes when output

AnnVbar

'|'

AnnWhere 
Annlarrowtail

-<

AnnlarrowtailU

-<, unicode variant

Annrarrowtail

'->'

AnnrarrowtailU

'->', unicode variant

AnnLarrowtail

-<<

AnnLarrowtailU

-<<, unicode variant

AnnRarrowtail

>>-

AnnRarrowtailU

>>-, unicode variant

AnnEofPos 

Instances

Eq AnnKeywordId # 
Data AnnKeywordId # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> AnnKeywordId -> c AnnKeywordId Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c AnnKeywordId Source #

toConstr :: AnnKeywordId -> Constr Source #

dataTypeOf :: AnnKeywordId -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c AnnKeywordId) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c AnnKeywordId) Source #

gmapT :: (forall b. Data b => b -> b) -> AnnKeywordId -> AnnKeywordId Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> AnnKeywordId -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> AnnKeywordId -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> AnnKeywordId -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> AnnKeywordId -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> AnnKeywordId -> m AnnKeywordId Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> AnnKeywordId -> m AnnKeywordId Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> AnnKeywordId -> m AnnKeywordId Source #

Ord AnnKeywordId # 
Show AnnKeywordId # 
Outputable AnnKeywordId # 

data AnnotationComment #

Constructors

AnnDocCommentNext String

something beginning '-- |'

AnnDocCommentPrev String

something beginning '-- ^'

AnnDocCommentNamed String

something beginning '-- $'

AnnDocSection Int String

a section heading

AnnDocOptions String

doc options (prune, ignore-exports, etc)

AnnLineComment String

comment starting by "--"

AnnBlockComment String

comment in {- -}

Instances

Eq AnnotationComment # 
Data AnnotationComment # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> AnnotationComment -> c AnnotationComment Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c AnnotationComment Source #

toConstr :: AnnotationComment -> Constr Source #

dataTypeOf :: AnnotationComment -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c AnnotationComment) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c AnnotationComment) Source #

gmapT :: (forall b. Data b => b -> b) -> AnnotationComment -> AnnotationComment Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> AnnotationComment -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> AnnotationComment -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> AnnotationComment -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> AnnotationComment -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> AnnotationComment -> m AnnotationComment Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> AnnotationComment -> m AnnotationComment Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> AnnotationComment -> m AnnotationComment Source #

Ord AnnotationComment # 
Show AnnotationComment # 
Outputable AnnotationComment # 

getAnnotation :: ApiAnns -> SrcSpan -> AnnKeywordId -> [SrcSpan] #

Retrieve a list of annotation SrcSpans based on the SrcSpan of the annotated AST element, and the known type of the annotation.

getAndRemoveAnnotation :: ApiAnns -> SrcSpan -> AnnKeywordId -> ([SrcSpan], ApiAnns) #

Retrieve a list of annotation SrcSpans based on the SrcSpan of the annotated AST element, and the known type of the annotation. The list is removed from the annotations.

getAnnotationComments :: ApiAnns -> SrcSpan -> [Located AnnotationComment] #

Retrieve the comments allocated to the current SrcSpan

Note: A given SrcSpan may appear in multiple AST elements, beware of duplicates

getAndRemoveAnnotationComments :: ApiAnns -> SrcSpan -> ([Located AnnotationComment], ApiAnns) #

Retrieve the comments allocated to the current SrcSpan, and remove them from the annotations

unicodeAnn :: AnnKeywordId -> AnnKeywordId #

Convert a normal annotation into its unicode equivalent one

Miscellaneous