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 TysWiredIn ( isFFIArgumentTy, isFFIImportResultTy,
- isFFIExportResultTy,
- isFFIExternalTy, isFFIDynArgumentTy, isFFIDynResultTy,
- isFFILabelTy
+import PrimRep ( getPrimRepSize )
+import Type ( typePrimRep )
+import TcType ( Type, tcSplitFunTys, tcSplitTyConApp_maybe, tcSplitForAllTys,
+ isFFIArgumentTy, isFFIImportResultTy,
+ isFFIExportResultTy, isFFILabelTy,
+ isFFIExternalTy, isFFIDynArgumentTy, isFFIDynResultTy
)
-import TcType ( Type, tcSplitFunTys, tcSplitTyConApp_maybe, tcSplitForAllTys )
import ForeignCall ( CCallSpec(..), CExportSpec(..), CCallTarget(..), isDynamicTarget, isCasmTarget )
import CStrings ( CLabelString, isCLabelString )
import PrelNames ( hasKey, ioTyConKey )
tcFImport fo@(ForeignImport nm hs_ty imp_decl src_loc)
= tcAddSrcLoc src_loc $
tcAddErrCtxt (foreignDeclCtxt fo) $
- tcHsLiftedSigType hs_ty `thenTc` \ sig_ty ->
+ tcHsSigType (ForSigCtxt nm) hs_ty `thenTc` \ sig_ty ->
let
-- drop the foralls before inspecting the structure
-- of the foreign type.
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)
= 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}
+
%************************************************************************
%* *
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_`
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}
+