#include "HsVersions.h"
import HsSyn ( HsDecl(..), ForeignDecl(..), HsExpr(..),
- MonoBinds(..), FoImport(..), FoExport(..)
+ MonoBinds(..), ForeignImport(..), ForeignExport(..),
+ CImportSpec(..)
)
import RnHsSyn ( RenamedHsDecl, RenamedForeignDecl )
import TcMonad
-import TcEnv ( newLocalId )
import TcMonoType ( tcHsSigType, UserTypeCtxt(..) )
import TcHsSyn ( TcMonoBinds, TypecheckedForeignDecl, TcForeignExportDecl )
-import TcExpr ( tcPolyExpr )
+import TcExpr ( tcExpr )
import Inst ( emptyLIE, LIE, plusLIE )
import ErrUtils ( Message )
-import Id ( Id, mkLocalId )
-import Name ( nameOccName )
-import TysWiredIn ( isFFIArgumentTy, isFFIImportResultTy,
- isFFIExportResultTy,
- isFFIExternalTy, isFFIDynArgumentTy, isFFIDynResultTy,
- isFFILabelTy
+import Id ( Id, mkLocalId, setIdLocalExported )
+import PrimRep ( getPrimRepSize, isFloatingRep )
+import Module ( Module )
+import Type ( typePrimRep )
+import OccName ( mkForeignExportOcc )
+import Name ( NamedThing(..), mkExternalName )
+import TcType ( Type, tcSplitFunTys, tcSplitTyConApp_maybe,
+ tcSplitForAllTys,
+ isFFIArgumentTy, isFFIImportResultTy,
+ isFFIExportResultTy, isFFILabelTy,
+ isFFIExternalTy, isFFIDynArgumentTy,
+ isFFIDynResultTy, isForeignPtrTy
)
-import TcType ( Type, tcSplitFunTys, tcSplitTyConApp_maybe, tcSplitForAllTys )
-import ForeignCall ( CCallSpec(..), CExportSpec(..), CCallTarget(..), isDynamicTarget, isCasmTarget )
+import ForeignCall ( CExportSpec(..), CCallTarget(..),
+ isDynamicTarget, isCasmTarget )
import CStrings ( CLabelString, isCLabelString )
import PrelNames ( hasKey, ioTyConKey )
import CmdLineOpts ( dopt_HscLang, HscLang(..) )
\begin{code}
-- Defines a binding
isForeignImport :: ForeignDecl name -> Bool
-isForeignImport (ForeignImport _ _ _ _) = True
-isForeignImport _ = False
+isForeignImport (ForeignImport _ _ _ _ _) = True
+isForeignImport _ = False
-- Exports a binding
isForeignExport :: ForeignDecl name -> Bool
-isForeignExport (ForeignExport _ _ _ _) = True
-isForeignExport _ = False
+isForeignExport (ForeignExport _ _ _ _ _) = True
+isForeignExport _ = False
\end{code}
%************************************************************************
\begin{code}
tcForeignImports :: [RenamedHsDecl] -> TcM ([Id], [TypecheckedForeignDecl])
tcForeignImports decls =
- mapAndUnzipTc tcFImport [ foreign_decl | ForD foreign_decl <- decls, isForeignImport foreign_decl]
+ 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)
+tcFImport fo@(ForeignImport nm hs_ty imp_decl isDeprec src_loc)
= tcAddSrcLoc src_loc $
tcAddErrCtxt (foreignDeclCtxt fo) $
tcHsSigType (ForSigCtxt nm) hs_ty `thenTc` \ sig_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)
+ -- can't use sig_ty here because it :: Type and we need HsType Id
+ -- hence the undefined
+ returnTc (id, ForeignImport id undefined imp_decl isDeprec src_loc)
\end{code}
tcCheckFIType _ _ _ (DNImport _)
= checkCg checkDotNet
-tcCheckFIType sig_ty arg_tys res_ty (LblImport _)
+tcCheckFIType sig_ty arg_tys res_ty (CImport _ _ _ _ (CLabel _))
= 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_`
+tcCheckFIType sig_ty arg_tys res_ty (CImport _ _ _ _ CWrapper)
+ = -- Foreign wrapper (former f.e.d.)
+ -- The type must be of the form ft -> IO (FunPtr ft), where ft is a
+ -- valid foreign type. For legacy reasons ft -> IO (Ptr ft) as well
+ -- as ft -> IO Addr is accepted, too. The use of the latter two forms
+ -- is DEPRECATED, though.
+ checkCg checkCOrAsmOrInterp `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
+ 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))
+tcCheckFIType sig_ty arg_tys res_ty (CImport _ safety _ _ (CFunction target))
| isDynamicTarget target -- Foreign import dynamic
= checkCg checkCOrAsmOrInterp `thenNF_Tc_`
- case arg_tys of -- The first arg must be Addr
+ case arg_tys of -- The first arg must be Ptr, FunPtr, or Addr
[] -> check False (illegalForeignTyErr empty sig_ty)
(arg1_ty:arg_tys) -> getDOptsTc `thenNF_Tc` \ dflags ->
check (isFFIDynArgumentTy arg1_ty)
= 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")
+#else
+#if alpha_TARGET_ARCH
+checkFEDArgs arg_tys
+ = check (integral_args <= 4) err
+ where
+ integral_args = sum (map getPrimRepSize $
+ filter (not . isFloatingRep) $
+ map 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
+#endif
+\end{code}
+
%************************************************************************
%* *
%************************************************************************
\begin{code}
-tcForeignExports :: [RenamedHsDecl] -> TcM (LIE, TcMonoBinds, [TcForeignExportDecl])
-tcForeignExports decls =
+tcForeignExports :: Module -> [RenamedHsDecl]
+ -> TcM (LIE, TcMonoBinds, [TcForeignExportDecl])
+tcForeignExports mod decls =
foldlTc combine (emptyLIE, EmptyMonoBinds, [])
- [ foreign_decl | ForD foreign_decl <- decls, isForeignExport foreign_decl]
+ [foreign_decl | ForD foreign_decl <- decls, isForeignExport foreign_decl]
where
combine (lie, binds, fs) fe =
- tcFExport fe `thenTc ` \ (a_lie, b, f) ->
+ tcFExport mod fe `thenTc ` \ (a_lie, b, f) ->
returnTc (lie `plusLIE` a_lie, b `AndMonoBinds` binds, f:fs)
-tcFExport :: RenamedForeignDecl -> TcM (LIE, TcMonoBinds, TcForeignExportDecl)
-tcFExport fo@(ForeignExport nm hs_ty spec src_loc) =
+tcFExport :: Module -> RenamedForeignDecl -> TcM (LIE, TcMonoBinds, TcForeignExportDecl)
+tcFExport mod fo@(ForeignExport nm hs_ty spec isDeprec src_loc) =
tcAddSrcLoc src_loc $
tcAddErrCtxt (foreignDeclCtxt fo) $
tcHsSigType (ForSigCtxt nm) hs_ty `thenTc` \ sig_ty ->
- tcPolyExpr (HsVar nm) sig_ty `thenTc` \ (rhs, lie, _, _, _) ->
+ tcExpr (HsVar nm) sig_ty `thenTc` \ (rhs, lie) ->
tcCheckFEType sig_ty spec `thenTc_`
- -- we're exporting a function, but at a type possibly more constrained
- -- than its declared/inferred type. Hence the need
+ -- 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` \ id ->
+
+ tcGetUnique `thenNF_Tc` \ uniq ->
let
- bind = VarMonoBind id rhs
+ gnm = mkExternalName uniq mod (mkForeignExportOcc (getOccName nm)) src_loc
+ id = setIdLocalExported (mkLocalId gnm sig_ty)
+ bind = VarMonoBind id rhs
in
- returnTc (lie, bind, ForeignExport id undefined spec src_loc)
+ returnTc (lie, bind, ForeignExport id undefined spec isDeprec src_loc)
\end{code}
------------ Checking argument types for foreign export ----------------------
------------ Checking argument types for foreign import ----------------------
checkForeignArgs :: (Type -> Bool) -> [Type] -> NF_TcM ()
checkForeignArgs pred tys
- = mapNF_Tc go tys `thenNF_Tc_` returnNF_Tc ()
+ = mapNF_Tc go tys `thenNF_Tc_`
+ returnNF_Tc ()
where
- go ty = check (pred ty) (illegalForeignTyErr argument ty)
-
+ go ty = check (pred ty) (illegalForeignTyErr argument ty) `thenNF_Tc_`
+ warnTc (isForeignPtrTy ty) foreignPtrWarn
+ --
+ foreignPtrWarn =
+ text "`ForeignPtr' as argument type in a foreign import is deprecated"
------------ Checking result types for foreign calls ----------------------
-- Check that the type has the form
checkCg check
= getDOptsTc `thenNF_Tc` \ dflags ->
- case check (dopt_HscLang dflags) of
- Nothing -> returnNF_Tc ()
- Just err -> addErrTc (text "Illegal foreign declaration:" <+> err)
+ 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
= hang (ptext SLIT("When checking declaration:"))
4 (ppr fo)
\end{code}
+
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