GHC.Tc.Module

Typechecking a whole module

https://gitlab.haskell.org/ghc/ghc/wikis/commentary/compiler/type-checker

Documentation

tcRnStmt :: HscEnv -> GhciLStmt GhcPs -> IO (Messages TcRnMessage, Maybe ([Id], LHsExpr GhcTc, FixityEnv))

The returned [Id] is the list of new Ids bound by this statement. It can be used to extend the InteractiveContext via extendInteractiveContext.

The returned TypecheckedHsExpr is of type IO [ () ], a list of the bound values, coerced to ().

tcRnExpr :: HscEnv -> TcRnExprMode -> LHsExpr GhcPs -> IO (Messages TcRnMessage, Maybe Type)

tcRnExpr just finds the type of an expression for :type

data TcRnExprMode

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

Constructors

TM_Inst

Instantiate inferred quantifiers only (:type)

TM_Default

Instantiate all quantifiers, and do eager defaulting (:type +d)

tcRnType :: HscEnv -> ZonkFlexi -> Bool -> LHsType GhcPs -> IO (Messages TcRnMessage, Maybe (Type, Kind))

tcRnImportDecls :: HscEnv -> [LImportDecl GhcPs] -> IO (Messages TcRnMessage, Maybe GlobalRdrEnv)

tcRnLookupRdrName :: HscEnv -> LocatedN RdrName -> IO (Messages TcRnMessage, Maybe [Name])

Find all the Names that this RdrName could mean, in GHCi

getModuleInterface :: HscEnv -> Module -> IO (Messages TcRnMessage, Maybe ModIface)

ASSUMES that the module is either in the HomePackageTable or is a package module with an interface on disk. If neither of these is true, then the result will be an error indicating the interface could not be found.

tcRnDeclsi :: HscEnv -> [LHsDecl GhcPs] -> IO (Messages TcRnMessage, Maybe TcGblEnv)

isGHCiMonad :: HscEnv -> String -> IO (Messages TcRnMessage, Maybe Name)

runTcInteractive :: HscEnv -> TcRn a -> IO (Messages TcRnMessage, Maybe a)

withTcPlugins :: HscEnv -> TcM a -> TcM a

withHoleFitPlugins :: HscEnv -> TcM a -> TcM a

tcRnLookupName :: HscEnv -> Name -> IO (Messages TcRnMessage, Maybe TyThing)

tcRnGetInfo :: HscEnv -> Name -> IO (Messages TcRnMessage, Maybe (TyThing, Fixity, [ClsInst], [FamInst], SDoc))

tcRnModule :: HscEnv -> ModSummary -> Bool -> HsParsedModule -> IO (Messages TcRnMessage, Maybe TcGblEnv)

Top level entry point for typechecker and renamer

tcRnModuleTcRnM :: HscEnv -> ModSummary -> HsParsedModule -> (Module, SrcSpan) -> TcRn TcGblEnv

tcTopSrcDecls :: HsGroup GhcRn -> TcM (TcGblEnv, TcLclEnv)

rnTopSrcDecls :: HsGroup GhcPs -> TcM (TcGblEnv, HsGroup GhcRn)

checkBootDecl :: Bool -> TyThing -> TyThing -> Maybe SDoc

Compares the two things for equivalence between boot-file and normal code. Returns Nothing on success or Just "some helpful info for user" failure. If the difference will be apparent to the user, Just empty is perfectly suitable.

checkHiBootIface' :: [ClsInst] -> TypeEnv -> [AvailInfo] -> ModDetails -> TcM [(Id, Id)]

findExtraSigImports :: HscEnv -> HscSource -> ModuleName -> IO [ModuleName]

For a module modname of type HscSource, determine the list of extra "imports" of other requirements which should be considered part of the import of the requirement, because it transitively depends on those requirements by imports of modules from other packages. The situation is something like this:

unit p where signature X signature Y import X

unit q where dependency p[X=<A>,Y=<B>] signature A signature B

Although q's B does not directly import A, we still have to make sure we process A first, because the merging process will cause B to indirectly import A. This function finds the TRANSITIVE closure of all such imports we need to make.

implicitRequirements :: HscEnv -> [(PkgQual, Located ModuleName)] -> IO [ModuleName]

checkUnit :: Unit -> TcM ()

Given a Unit, make sure it is well typed. This is because unit IDs come from Cabal, which does not know if things are well-typed or not; a component may have been filled with implementations for the holes that don't actually fulfill the requirements.

mergeSignatures :: HsParsedModule -> TcGblEnv -> ModIface -> TcRn TcGblEnv

Given a local ModIface, merge all inherited requirements from requirementMerges into this signature, producing a final TcGblEnv that matches the local signature and all required signatures.

tcRnMergeSignatures :: HscEnv -> HsParsedModule -> TcGblEnv -> ModIface -> IO (Messages TcRnMessage, Maybe TcGblEnv)

Top-level driver for signature merging (run after typechecking an hsig file).

instantiateSignature :: TcRn TcGblEnv

Given tcg_mod, instantiate a ModIface from the indefinite library to use the actual implementations of the relevant entities, checking that the implementation matches the signature.

tcRnInstantiateSignature :: HscEnv -> Module -> RealSrcSpan -> IO (Messages TcRnMessage, Maybe TcGblEnv)

Top-level driver for signature instantiation (run when compiling an hsig file.)

loadUnqualIfaces :: HscEnv -> InteractiveContext -> TcM ()

badReexportedBootThing :: Bool -> Name -> Name -> TcRnMessage

checkBootDeclM

Arguments

:: Bool

True = an hs-boot file (could also be a sig)

-> TyThing

-> TyThing

-> TcM ()

Compares two things for equivalence between boot-file and normal code, reporting an error if they don't match up.

missingBootThing :: Bool -> Name -> String -> TcRnMessage

getRenamedStuff :: TcGblEnv -> RenamedStuff

Extract the renamed information from TcGblEnv.

type RenamedStuff = Maybe (HsGroup GhcRn, [LImportDecl GhcRn], Maybe [(LIE GhcRn, Avails)], Maybe (LHsDoc GhcRn))