#include "HsVersions.h"
import HsSyn ( HsDecl(..), ForeignDecl(..), HsExpr(..),
- ExtName(Dynamic), isDynamicExtName, MonoBinds(..),
- ForKind(..)
+ MonoBinds(..), FoImport(..), FoExport(..)
)
import RnHsSyn ( RenamedHsDecl, RenamedForeignDecl )
import TcMonad
import TcEnv ( newLocalId )
-import TcMonoType ( tcHsLiftedSigType )
-import TcHsSyn ( TcMonoBinds, TypecheckedForeignDecl,
- TcForeignExportDecl )
+import TcMonoType ( tcHsSigType, UserTypeCtxt(..) )
+import TcHsSyn ( TcMonoBinds, TypecheckedForeignDecl, TcForeignExportDecl )
import TcExpr ( tcPolyExpr )
import Inst ( emptyLIE, LIE, plusLIE )
import ErrUtils ( Message )
import Id ( Id, mkLocalId )
import Name ( nameOccName )
-import Type ( splitFunTys
- , splitTyConApp_maybe
- , splitForAllTys
+import PrimRep ( getPrimRepSize )
+import Type ( typePrimRep )
+import TcType ( Type, tcSplitFunTys, tcSplitTyConApp_maybe, tcSplitForAllTys,
+ isFFIArgumentTy, isFFIImportResultTy,
+ isFFIExportResultTy, isFFILabelTy,
+ isFFIExternalTy, isFFIDynArgumentTy, isFFIDynResultTy
)
-import TysWiredIn ( isFFIArgumentTy, isFFIImportResultTy,
- isFFIExportResultTy,
- isFFIExternalTy, isFFIDynArgumentTy, isFFIDynResultTy,
- isFFILabelTy
- )
-import Type ( Type )
+import ForeignCall ( CCallSpec(..), CExportSpec(..), CCallTarget(..), isDynamicTarget, isCasmTarget )
+import CStrings ( CLabelString, isCLabelString )
import PrelNames ( hasKey, ioTyConKey )
+import CmdLineOpts ( dopt_HscLang, HscLang(..) )
import Outputable
\end{code}
\begin{code}
+-- Defines a binding
+isForeignImport :: ForeignDecl name -> Bool
+isForeignImport (ForeignImport _ _ _ _) = True
+isForeignImport _ = False
+
+-- Exports a binding
+isForeignExport :: ForeignDecl name -> Bool
+isForeignExport (ForeignExport _ _ _ _) = True
+isForeignExport _ = False
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Imports}
+%* *
+%************************************************************************
+
+\begin{code}
tcForeignImports :: [RenamedHsDecl] -> TcM ([Id], [TypecheckedForeignDecl])
tcForeignImports decls =
mapAndUnzipTc tcFImport [ foreign_decl | ForD foreign_decl <- decls, isForeignImport foreign_decl]
+tcFImport :: RenamedForeignDecl -> TcM (Id, TypecheckedForeignDecl)
+tcFImport fo@(ForeignImport nm hs_ty imp_decl src_loc)
+ = tcAddSrcLoc src_loc $
+ tcAddErrCtxt (foreignDeclCtxt fo) $
+ tcHsSigType (ForSigCtxt nm) hs_ty `thenTc` \ sig_ty ->
+ let
+ -- drop the foralls before inspecting the structure
+ -- of the foreign type.
+ (_, t_ty) = tcSplitForAllTys sig_ty
+ (arg_tys, res_ty) = tcSplitFunTys t_ty
+ id = mkLocalId nm sig_ty
+ in
+ tcCheckFIType sig_ty arg_tys res_ty imp_decl `thenNF_Tc_`
+ returnTc (id, ForeignImport id undefined imp_decl src_loc)
+\end{code}
+
+
+------------ Checking types for foreign import ----------------------
+\begin{code}
+tcCheckFIType _ _ _ (DNImport _)
+ = checkCg checkDotNet
+
+tcCheckFIType sig_ty arg_tys res_ty (LblImport _)
+ = checkCg checkCOrAsm `thenNF_Tc_`
+ check (isFFILabelTy sig_ty) (illegalForeignTyErr empty sig_ty)
+
+tcCheckFIType sig_ty arg_tys res_ty (CDynImport _)
+ = -- Foreign export dynamic
+ -- The first (and only!) arg has got to be a function type
+ -- and it must return IO t; result type is IO Addr
+ checkCg checkCOrAsm `thenNF_Tc_`
+ case arg_tys of
+ [arg1_ty] -> checkForeignArgs isFFIExternalTy arg1_tys `thenNF_Tc_`
+ checkForeignRes nonIOok isFFIExportResultTy res1_ty `thenNF_Tc_`
+ checkForeignRes mustBeIO isFFIDynResultTy res_ty `thenNF_Tc_`
+ checkFEDArgs arg1_tys
+ where
+ (arg1_tys, res1_ty) = tcSplitFunTys arg1_ty
+ other -> addErrTc (illegalForeignTyErr empty sig_ty)
+
+tcCheckFIType sig_ty arg_tys res_ty (CImport (CCallSpec target _ safety))
+ | isDynamicTarget target -- Foreign import dynamic
+ = checkCg checkCOrAsmOrInterp `thenNF_Tc_`
+ case arg_tys of -- The first arg must be Addr
+ [] -> check False (illegalForeignTyErr empty sig_ty)
+ (arg1_ty:arg_tys) -> getDOptsTc `thenNF_Tc` \ dflags ->
+ check (isFFIDynArgumentTy arg1_ty)
+ (illegalForeignTyErr argument arg1_ty) `thenNF_Tc_`
+ checkForeignArgs (isFFIArgumentTy dflags safety) arg_tys `thenNF_Tc_`
+ checkForeignRes nonIOok (isFFIImportResultTy dflags) res_ty
+
+ | otherwise -- Normal foreign import
+ = checkCg (if isCasmTarget target
+ then checkC else checkCOrAsmOrDotNetOrInterp) `thenNF_Tc_`
+ checkCTarget target `thenNF_Tc_`
+ getDOptsTc `thenNF_Tc` \ dflags ->
+ checkForeignArgs (isFFIArgumentTy dflags safety) arg_tys `thenNF_Tc_`
+ checkForeignRes nonIOok (isFFIImportResultTy dflags) res_ty
+
+-- This makes a convenient place to check
+-- that the C identifier is valid for C
+checkCTarget (StaticTarget str)
+ = checkCg checkCOrAsmOrDotNetOrInterp `thenNF_Tc_`
+ check (isCLabelString str) (badCName str)
+
+checkCTarget (CasmTarget _)
+ = checkCg checkC
+\end{code}
+
+On a SPARC, with foreign export dynamic, due to a giant hack when building
+adjustor thunks, we only allow 16 bytes of arguments!
+
+So for example, args (Int,Double,Int) would be OK (1+2+1)
+as would (Int,Int,Int,Int) (1+1+1+1) but not (Int,Double,Double) (1+2+2).
+
+On an Alpha, due to a similar hack, we only allow 4 integer arguments with
+foreign export dynamic (i.e., 32 bytes of arguments after padding each
+argument to a quadword, excluding floating-point arguments).
+
+The check is needed for both via-C and native-code routes
+
+\begin{code}
+#include "nativeGen/NCG.h"
+#if sparc_TARGET_ARCH
+checkFEDArgs arg_tys
+ = check (words_of_args <= 4) err
+ where
+ words_of_args = sum (map (getPrimRepSize . typePrimRep) arg_tys)
+ err = ptext SLIT("On SPARC, I can only handle 4 words of arguments to foreign export dynamic")
+#elsif alpha_TARGET_ARCH
+checkFEDArgs arg_tys
+ = check (integral_args <= 4) err
+ where
+ integral_args = sum (map (getPrimRepSize . filter (not . isFloatingRep)
+ . typePrimRep) arg_tys)
+ err = ptext SLIT("On Alpha, I can only handle 4 non-floating-point arguments to foreign export dynamic")
+#else
+checkFEDArgs arg_tys = returnNF_Tc ()
+#endif
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Exports}
+%* *
+%************************************************************************
+
+\begin{code}
tcForeignExports :: [RenamedHsDecl] -> TcM (LIE, TcMonoBinds, [TcForeignExportDecl])
tcForeignExports decls =
foldlTc combine (emptyLIE, EmptyMonoBinds, [])
tcFExport fe `thenTc ` \ (a_lie, b, f) ->
returnTc (lie `plusLIE` a_lie, b `AndMonoBinds` binds, f:fs)
--- defines a binding
-isForeignImport :: ForeignDecl name -> Bool
-isForeignImport (ForeignDecl _ k _ dyn _ _) =
- case k of
- FoImport _ -> True
- FoExport -> case dyn of { Dynamic -> True ; _ -> False }
- FoLabel -> True
-
--- exports a binding
-isForeignExport :: ForeignDecl name -> Bool
-isForeignExport (ForeignDecl _ FoExport _ ext_nm _ _) = not (isDynamicExtName ext_nm)
-isForeignExport _ = False
-
-\end{code}
-
-\begin{code}
-tcFImport :: RenamedForeignDecl -> TcM (Id, TypecheckedForeignDecl)
-tcFImport fo@(ForeignDecl nm FoExport hs_ty Dynamic cconv src_loc) =
- tcAddSrcLoc src_loc $
- tcAddErrCtxt (foreignDeclCtxt fo) $
- tcHsLiftedSigType hs_ty `thenTc` \ sig_ty ->
- let
- -- drop the foralls before inspecting the structure
- -- of the foreign type.
- (_, t_ty) = splitForAllTys sig_ty
- in
- case splitFunTys t_ty of
- (arg_tys, res_ty) ->
- checkForeignExport True t_ty arg_tys res_ty `thenTc_`
- let i = (mkLocalId nm sig_ty) in
- returnTc (i, (ForeignDecl i FoExport undefined Dynamic cconv src_loc))
-
-tcFImport fo@(ForeignDecl nm FoLabel hs_ty ext_nm cconv src_loc) =
- tcAddSrcLoc src_loc $
- tcAddErrCtxt (foreignDeclCtxt fo) $
- tcHsLiftedSigType hs_ty `thenTc` \ sig_ty ->
- let
- -- drop the foralls before inspecting the structure
- -- of the foreign type.
- (_, t_ty) = splitForAllTys sig_ty
- in
- check (isFFILabelTy t_ty)
- (illegalForeignTyErr False{-result-} sig_ty) `thenTc_`
- let i = (mkLocalId nm sig_ty) in
- returnTc (i, (ForeignDecl i FoLabel undefined ext_nm cconv src_loc))
-
-tcFImport fo@(ForeignDecl nm imp_exp@(FoImport isUnsafe) hs_ty ext_nm cconv src_loc) =
- tcAddSrcLoc src_loc $
- tcAddErrCtxt (foreignDeclCtxt fo) $
-
- tcHsLiftedSigType hs_ty `thenTc` \ ty ->
- -- Check that the type has the right shape
- -- and that the argument and result types are acceptable.
- let
- -- drop the foralls before inspecting the structure
- -- of the foreign type.
- (_, t_ty) = splitForAllTys ty
- in
- case splitFunTys t_ty of
- (arg_tys, res_ty) ->
- checkForeignImport (isDynamicExtName ext_nm) (not isUnsafe) ty arg_tys res_ty `thenTc_`
- let i = (mkLocalId nm ty) in
- returnTc (i, (ForeignDecl i imp_exp undefined ext_nm cconv src_loc))
-
tcFExport :: RenamedForeignDecl -> TcM (LIE, TcMonoBinds, TcForeignExportDecl)
-tcFExport fo@(ForeignDecl nm imp_exp hs_ty ext_nm cconv src_loc) =
- tcAddSrcLoc src_loc $
- tcAddErrCtxt (foreignDeclCtxt fo) $
+tcFExport fo@(ForeignExport nm hs_ty spec src_loc) =
+ tcAddSrcLoc src_loc $
+ tcAddErrCtxt (foreignDeclCtxt fo) $
- tcHsLiftedSigType hs_ty `thenTc` \ sig_ty ->
- tcPolyExpr (HsVar nm) sig_ty `thenTc` \ (rhs, lie, _, _, _) ->
+ tcHsSigType (ForSigCtxt nm) hs_ty `thenTc` \ sig_ty ->
+ tcPolyExpr (HsVar nm) sig_ty `thenTc` \ (rhs, lie, _, _, _) ->
+
+ tcCheckFEType sig_ty spec `thenTc_`
- let
- -- drop the foralls before inspecting the structure
- -- of the foreign type.
- (_, t_ty) = splitForAllTys sig_ty
- in
- case splitFunTys t_ty of
- (arg_tys, res_ty) ->
- checkForeignExport False t_ty arg_tys res_ty `thenTc_`
-- we're exporting a function, but at a type possibly more constrained
-- than its declared/inferred type. Hence the need
-- to create a local binding which will call the exported function
-- at a particular type (and, maybe, overloading).
- newLocalId (nameOccName nm) sig_ty src_loc `thenNF_Tc` \ i ->
- let
- bind = VarMonoBind i rhs
- in
- returnTc (lie, bind, ForeignDecl i imp_exp undefined ext_nm cconv src_loc)
- -- ^^^^^^^^^
- -- ToDo: fill the type field in with something sensible.
+ newLocalId (nameOccName nm) sig_ty src_loc `thenNF_Tc` \ id ->
+ let
+ bind = VarMonoBind id rhs
+ in
+ returnTc (lie, bind, ForeignExport id undefined spec src_loc)
+\end{code}
+
+------------ Checking argument types for foreign export ----------------------
+\begin{code}
+tcCheckFEType sig_ty (CExport (CExportStatic str _))
+ = check (isCLabelString str) (badCName str) `thenNF_Tc_`
+ checkForeignArgs isFFIExternalTy arg_tys `thenNF_Tc_`
+ checkForeignRes nonIOok isFFIExportResultTy res_ty
+ where
+ -- Drop the foralls before inspecting n
+ -- the structure of the foreign type.
+ (_, t_ty) = tcSplitForAllTys sig_ty
+ (arg_tys, res_ty) = tcSplitFunTys t_ty
\end{code}
+
+%************************************************************************
+%* *
+\subsection{Miscellaneous}
+%* *
+%************************************************************************
+
\begin{code}
-checkForeignImport :: Bool -> Bool -> Type -> [Type] -> Type -> TcM ()
-checkForeignImport is_dynamic is_safe ty args res
- | is_dynamic =
- -- * first arg has got to be an Addr
- case args of
- [] -> check False (illegalForeignTyErr True{-Arg-} ty)
- (x:xs) ->
- getDOptsTc `thenTc` \ dflags ->
- check (isFFIDynArgumentTy x) (illegalForeignTyErr True{-Arg-} ty) `thenTc_`
- mapTc (checkForeignArg (isFFIArgumentTy dflags is_safe)) xs `thenTc_`
- checkForeignRes True {-NonIO ok-} (isFFIImportResultTy dflags) res
- | otherwise =
- getDOptsTc `thenTc` \ dflags ->
- mapTc (checkForeignArg (isFFIArgumentTy dflags is_safe)) args `thenTc_`
- checkForeignRes True {-NonIO ok-} (isFFIImportResultTy dflags) res
-
-checkForeignExport :: Bool -> Type -> [Type] -> Type -> TcM ()
-checkForeignExport is_dynamic ty args res
- | is_dynamic =
- -- * the first (and only!) arg has got to be a function type
- -- and it must return IO t
- -- * result type is IO Addr
- case args of
- [arg] ->
- case splitFunTys arg of
- (arg_tys, res_ty) ->
- mapTc (checkForeignArg isFFIExternalTy) arg_tys `thenTc_`
- checkForeignRes True {-NonIO ok-} isFFIExportResultTy res_ty
- `thenTc_`
- checkForeignRes False {-Must be IO-} isFFIDynResultTy res
- _ -> check False (illegalForeignTyErr True{-Arg-} ty)
- | otherwise =
- mapTc (checkForeignArg isFFIExternalTy) args `thenTc_`
- checkForeignRes True {-NonIO ok-} isFFIExportResultTy res
-
-checkForeignArg :: (Type -> Bool) -> Type -> TcM ()
-checkForeignArg pred ty = check (pred ty) (illegalForeignTyErr True{-Arg-} ty)
+------------ Checking argument types for foreign import ----------------------
+checkForeignArgs :: (Type -> Bool) -> [Type] -> NF_TcM ()
+checkForeignArgs pred tys
+ = mapNF_Tc go tys `thenNF_Tc_` returnNF_Tc ()
+ where
+ go ty = check (pred ty) (illegalForeignTyErr argument ty)
+
+------------ Checking result types for foreign calls ----------------------
-- Check that the type has the form
-- (IO t) or (t) , and that t satisfies the given predicate.
--
-checkForeignRes :: Bool -> (Type -> Bool) -> Type -> TcM ()
-checkForeignRes non_io_result_ok pred_res_ty ty =
- case (splitTyConApp_maybe ty) of
- Just (io, [res_ty])
+checkForeignRes :: Bool -> (Type -> Bool) -> Type -> NF_TcM ()
+
+nonIOok = True
+mustBeIO = False
+
+checkForeignRes non_io_result_ok pred_res_ty ty
+ = case tcSplitTyConApp_maybe ty of
+ Just (io, [res_ty])
| io `hasKey` ioTyConKey && pred_res_ty res_ty
- -> returnTc ()
- _
+ -> returnNF_Tc ()
+ _
-> check (non_io_result_ok && pred_res_ty ty)
- (illegalForeignTyErr False{-Res-} ty)
+ (illegalForeignTyErr result ty)
\end{code}
+\begin{code}
+checkDotNet HscILX = Nothing
+checkDotNet other = Just (text "requires .NET code generation (-filx)")
+
+checkC HscC = Nothing
+checkC other = Just (text "requires C code generation (-fvia-C)")
+
+checkCOrAsm HscC = Nothing
+checkCOrAsm HscAsm = Nothing
+checkCOrAsm other
+ = Just (text "requires via-C or native code generation (-fvia-C)")
+
+checkCOrAsmOrInterp HscC = Nothing
+checkCOrAsmOrInterp HscAsm = Nothing
+checkCOrAsmOrInterp HscInterpreted = Nothing
+checkCOrAsmOrInterp other
+ = Just (text "requires interpreted, C or native code generation")
+
+checkCOrAsmOrDotNet HscC = Nothing
+checkCOrAsmOrDotNet HscAsm = Nothing
+checkCOrAsmOrDotNet HscILX = Nothing
+checkCOrAsmOrDotNet other
+ = Just (text "requires C, native or .NET ILX code generation")
+
+checkCOrAsmOrDotNetOrInterp HscC = Nothing
+checkCOrAsmOrDotNetOrInterp HscAsm = Nothing
+checkCOrAsmOrDotNetOrInterp HscILX = Nothing
+checkCOrAsmOrDotNetOrInterp HscInterpreted = Nothing
+checkCOrAsmOrDotNetOrInterp other
+ = Just (text "requires interpreted, C, native or .NET ILX code generation")
+
+checkCg check
+ = getDOptsTc `thenNF_Tc` \ dflags ->
+ let hscLang = dopt_HscLang dflags in
+ case hscLang of
+ HscNothing -> returnNF_Tc ()
+ otherwise ->
+ case check hscLang of
+ Nothing -> returnNF_Tc ()
+ Just err -> addErrTc (text "Illegal foreign declaration:" <+> err)
+\end{code}
+
Warnings
\begin{code}
-check :: Bool -> Message -> TcM ()
+check :: Bool -> Message -> NF_TcM ()
check True _ = returnTc ()
-check _ the_err = addErrTc the_err `thenNF_Tc_` returnTc ()
+check _ the_err = addErrTc the_err
-illegalForeignTyErr isArg ty
- = hang (hsep [ptext SLIT("Unacceptable"), arg_or_res, ptext SLIT("type in foreign declaration:")])
+illegalForeignTyErr arg_or_res ty
+ = hang (hsep [ptext SLIT("Unacceptable"), arg_or_res,
+ ptext SLIT("type in foreign declaration:")])
4 (hsep [ppr ty])
- where
- arg_or_res
- | isArg = ptext SLIT("argument")
- | otherwise = ptext SLIT("result")
-foreignDeclCtxt fo =
- hang (ptext SLIT("When checking declaration:"))
- 4 (ppr fo)
+-- Used for 'arg_or_res' argument to illegalForeignTyErr
+argument = text "argument"
+result = text "result"
+
+badCName :: CLabelString -> Message
+badCName target
+ = sep [quotes (ppr target) <+> ptext SLIT("is not a valid C identifier")]
+
+foreignDeclCtxt fo
+ = hang (ptext SLIT("When checking declaration:"))
+ 4 (ppr fo)
\end{code}
+
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