X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FstgSyn%2FCoreToStg.lhs;h=64f9fe3ad3b5f153ec6b5bfb23b58f682f46e8f5;hp=bdb3a6622d7edfcafb47cd9dca5d3649cd50d6ce;hb=6ef2fc2ebf11755a54386f8e317d83cb19913be1;hpb=d5934bbb856aa0aa620c9b2e0fa51c90a1a5a048

diff --git a/compiler/stgSyn/CoreToStg.lhs b/compiler/stgSyn/CoreToStg.lhs
index bdb3a66..64f9fe3 100644
--- a/compiler/stgSyn/CoreToStg.lhs
+++ b/compiler/stgSyn/CoreToStg.lhs
@@ -16,7 +16,6 @@ import CoreUtils	( rhsIsStatic, manifestArity, exprType, findDefault )
 import StgSyn
 
 import Type
-import Coercion         ( mkUnsafeCoercion )
 import TyCon		( isAlgTyCon )
 import Id
 import Var		( Var, globalIdDetails, idType )
@@ -505,8 +504,8 @@ coreToStgApp maybe_thunk_body f args
 	res_ty = exprType (mkApps (Var f) args)
 	app = case globalIdDetails f of
       		DataConWorkId dc | saturated -> StgConApp dc args'
-	        PrimOpId op  		     -> ASSERT( saturated )
-					        StgOpApp (StgPrimOp op) args' res_ty
+	        PrimOpId op  	 -> ASSERT( saturated )
+				    StgOpApp (StgPrimOp op) args' res_ty
 		FCallId call	 -> ASSERT( saturated )
 				    StgOpApp (StgFCallOp call (idUnique f)) args' res_ty
 		_other      	 -> StgApp f args'
@@ -549,6 +548,21 @@ coreToStgArgs (arg : args)	-- Non-type argument
 		       StgLit lit       -> StgLitArg lit
 		       _ 		-> pprPanic "coreToStgArgs" (ppr arg)
     in
+	-- WARNING: what if we have an argument like (v `cast` co)
+	-- 	    where 'co' changes the representation type?
+	--	    (This really only happens if co is unsafe.)
+	-- Then all the getArgAmode stuff in CgBindery will set the
+	-- cg_rep of the CgIdInfo based on the type of v, rather
+	-- than the type of 'co'.
+	-- This matters particularly when the function is a primop
+	-- or foreign call.
+	-- Wanted: a better solution than this hacky warning
+    let
+	arg_ty = exprType arg
+	stg_arg_ty = stgArgType stg_arg
+    in
+    WARN( isUnLiftedType arg_ty /= isUnLiftedType stg_arg_ty, 
+	  ptext SLIT("Dangerous-looking argument. Probable cause: bad unsafeCoerce#") $$ ppr arg)
     returnLne (stg_arg : stg_args, fvs)