X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcType.lhs;h=4ebeeb726cc0bcd2037676722d34bdb948a715cb;hb=36b27193c994b4a267c8dfdbf833d73b455130aa;hp=4b6e7b814e0b46d4698f1f4b8b8317bf3ece7adc;hpb=0065d5ab628975892cea1ec7303f968c3338cbe1;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcType.lhs b/compiler/typecheck/TcType.lhs
index 4b6e7b8..4ebeeb7 100644
--- a/compiler/typecheck/TcType.lhs
+++ b/compiler/typecheck/TcType.lhs
@@ -82,7 +82,7 @@ module TcType (
   isFFIDotnetTy,       -- :: DynFlags -> Type -> Bool
   isFFIDotnetObjTy,    -- :: Type -> Bool
   isFFITy,	       -- :: Type -> Bool
-  
+  tcSplitIOType_maybe, -- :: Type -> Maybe Type  
   toDNType,            -- :: Type -> DNType
 
   --------------------------------
@@ -160,7 +160,7 @@ import Type		(	-- Re-exports
 		  	  substTy, substTys, substTyWith, substTheta, 
 			  substTyVar, substTyVarBndr, substPred, lookupTyVar,
 
-			  typeKind, repType,
+			  typeKind, repType, coreView,
 			  pprKind, pprParendKind,
 			  pprType, pprParendType, pprTyThingCategory,
 			  pprPred, pprTheta, pprThetaArrow, pprClassPred
@@ -1029,6 +1029,23 @@ restricted set of types as arguments and results (the restricting factor
 being the )
 
 \begin{code}
+tcSplitIOType_maybe :: Type -> Maybe (TyCon, Type)
+-- (isIOType t) returns (Just (IO,t')) if t is of the form (IO t'), or
+--				       some newtype wrapping thereof
+--		returns Nothing otherwise
+tcSplitIOType_maybe ty 
+  | Just (io_tycon, [io_res_ty]) <- tcSplitTyConApp_maybe ty,
+	-- This split absolutely has to be a tcSplit, because we must
+	-- see the IO type; and it's a newtype which is transparent to splitTyConApp.
+    io_tycon `hasKey` ioTyConKey
+  = Just (io_tycon, io_res_ty)
+
+  | Just ty' <- coreView ty	-- Look through non-recursive newtypes
+  = tcSplitIOType_maybe ty'
+
+  | otherwise
+  = Nothing
+
 isFFITy :: Type -> Bool
 -- True for any TyCon that can possibly be an arg or result of an FFI call
 isFFITy ty = checkRepTyCon legalFFITyCon ty
@@ -1066,8 +1083,7 @@ isFFILabelTy = checkRepTyConKey [ptrTyConKey, funPtrTyConKey, addrTyConKey]
 
 isFFIDotnetTy :: DynFlags -> Type -> Bool
 isFFIDotnetTy dflags ty
-  = checkRepTyCon (\ tc -> not (isByteArrayLikeTyCon tc) &&
-  			   (legalFIResultTyCon dflags tc || 
+  = checkRepTyCon (\ tc -> (legalFIResultTyCon dflags tc || 
 			   isFFIDotnetObjTy ty || isStringTy ty)) ty
 
 -- Support String as an argument or result from a .NET FFI call.
@@ -1143,35 +1159,24 @@ These chaps do the work; they are not exported
 
 \begin{code}
 legalFEArgTyCon :: TyCon -> Bool
--- It's illegal to return foreign objects and (mutable)
--- bytearrays from a _ccall_ / foreign declaration
--- (or be passed them as arguments in foreign exported functions).
 legalFEArgTyCon tc
-  | isByteArrayLikeTyCon tc
-  = False
-  -- It's also illegal to make foreign exports that take unboxed
+  -- It's illegal to make foreign exports that take unboxed
   -- arguments.  The RTS API currently can't invoke such things.  --SDM 7/2000
-  | otherwise
   = boxedMarshalableTyCon tc
 
 legalFIResultTyCon :: DynFlags -> TyCon -> Bool
 legalFIResultTyCon dflags tc
-  | isByteArrayLikeTyCon tc = False
   | tc == unitTyCon         = True
   | otherwise	            = marshalableTyCon dflags tc
 
 legalFEResultTyCon :: TyCon -> Bool
 legalFEResultTyCon tc
-  | isByteArrayLikeTyCon tc = False
   | tc == unitTyCon         = True
   | otherwise               = boxedMarshalableTyCon tc
 
 legalOutgoingTyCon :: DynFlags -> Safety -> TyCon -> Bool
 -- Checks validity of types going from Haskell -> external world
 legalOutgoingTyCon dflags safety tc
-  | playSafe safety && isByteArrayLikeTyCon tc
-  = False
-  | otherwise
   = marshalableTyCon dflags tc
 
 legalFFITyCon :: TyCon -> Bool
@@ -1192,11 +1197,6 @@ boxedMarshalableTyCon tc
 			 , addrTyConKey, ptrTyConKey, funPtrTyConKey
 			 , charTyConKey
 			 , stablePtrTyConKey
-			 , byteArrayTyConKey, mutableByteArrayTyConKey
 			 , boolTyConKey
 			 ]
-
-isByteArrayLikeTyCon :: TyCon -> Bool
-isByteArrayLikeTyCon tc = 
-  getUnique tc `elem` [byteArrayTyConKey, mutableByteArrayTyConKey]
 \end{code}