Safe Haskell	None
Language	Haskell2010

GHC.Tc.Gen.Foreign

Description

Typechecking foreign declarations

A foreign declaration is used to either give an externally implemented function a Haskell type (and calling interface) or give a Haskell function an external calling interface. Either way, the range of argument and result types these functions can accommodate is restricted to what the outside world understands (read C), and this module checks to see if a foreign declaration has got a legal type.

Synopsis

tcForeignImports :: [LForeignDecl GhcRn] -> TcM ([Id], [LForeignDecl GhcTc], Bag GlobalRdrElt)
tcForeignExports :: [LForeignDecl GhcRn] -> TcM (LHsBinds GhcTc, [LForeignDecl GhcTc], Bag GlobalRdrElt)
isForeignImport :: forall name. UnXRec name => LForeignDecl name -> Bool
isForeignExport :: forall name. UnXRec name => LForeignDecl name -> Bool
tcFImport :: LForeignDecl GhcRn -> TcM (Id, LForeignDecl GhcTc, Bag GlobalRdrElt)
tcFExport :: ForeignDecl GhcRn -> TcM (LHsBind GhcTc, ForeignDecl GhcTc, Bag GlobalRdrElt)
tcForeignImports' :: [LForeignDecl GhcRn] -> TcM ([Id], [LForeignDecl GhcTc], Bag GlobalRdrElt)
tcCheckFIType :: [Scaled Type] -> Type -> ForeignImport -> TcM ForeignImport
checkCTarget :: CCallTarget -> TcM ()
checkForeignArgs :: (Type -> Validity) -> [Scaled Type] -> TcM ()
checkForeignRes :: Bool -> Bool -> (Type -> Validity) -> Type -> TcM ()
normaliseFfiType :: Type -> TcM (Coercion, Type, Bag GlobalRdrElt)
nonIOok :: Bool
mustBeIO :: Bool
checkSafe :: Bool
noCheckSafe :: Bool
tcForeignExports' :: [LForeignDecl GhcRn] -> TcM (LHsBinds GhcTc, [LForeignDecl GhcTc], Bag GlobalRdrElt)
tcCheckFEType :: Type -> ForeignExport -> TcM ForeignExport

Documentation

tcForeignImports :: [LForeignDecl GhcRn] -> TcM ([Id], [LForeignDecl GhcTc], Bag GlobalRdrElt) Source #

tcForeignExports :: [LForeignDecl GhcRn] -> TcM (LHsBinds GhcTc, [LForeignDecl GhcTc], Bag GlobalRdrElt) Source #

isForeignImport :: forall name. UnXRec name => LForeignDecl name -> Bool Source #

isForeignExport :: forall name. UnXRec name => LForeignDecl name -> Bool Source #

tcFImport :: LForeignDecl GhcRn -> TcM (Id, LForeignDecl GhcTc, Bag GlobalRdrElt) Source #

tcFExport :: ForeignDecl GhcRn -> TcM (LHsBind GhcTc, ForeignDecl GhcTc, Bag GlobalRdrElt) Source #

tcForeignImports' :: [LForeignDecl GhcRn] -> TcM ([Id], [LForeignDecl GhcTc], Bag GlobalRdrElt) Source #

tcCheckFIType :: [Scaled Type] -> Type -> ForeignImport -> TcM ForeignImport Source #

checkCTarget :: CCallTarget -> TcM () Source #

checkForeignArgs :: (Type -> Validity) -> [Scaled Type] -> TcM () Source #

checkForeignRes :: Bool -> Bool -> (Type -> Validity) -> Type -> TcM () Source #

Check that the type has the form (IO t) or (t) , and that t satisfies the given predicate. When calling this function, any newtype wrappers (should) have been already dealt with by normaliseFfiType.

We also check that the Safe Haskell condition of FFI imports having results in the IO monad holds.

normaliseFfiType :: Type -> TcM (Coercion, Type, Bag GlobalRdrElt) Source #

nonIOok :: Bool Source #

mustBeIO :: Bool Source #

checkSafe :: Bool Source #

noCheckSafe :: Bool Source #

tcForeignExports' :: [LForeignDecl GhcRn] -> TcM (LHsBinds GhcTc, [LForeignDecl GhcTc], Bag GlobalRdrElt) Source #

tcCheckFEType :: Type -> ForeignExport -> TcM ForeignExport Source #