[project @ 2004-08-13 13:04:50 by simonmar]

[ghc-hetmet.git] / ghc / compiler / deSugar / DsCCall.lhs

diff --git a/ghc/compiler/deSugar/DsCCall.lhs b/ghc/compiler/deSugar/DsCCall.lhs
index f2fdc28..57bace2 100644 (file)
--- a/ghc/compiler/deSugar/DsCCall.lhs
+++ b/ghc/compiler/deSugar/DsCCall.lhs
@@ -1,7 +1,7 @@
 %
 % (c) The AQUA Project, Glasgow University, 1994-1998
 %
-\section[DsCCall]{Desugaring \tr{_ccall_}s and \tr{_casm_}s}
+\section[DsCCall]{Desugaring C calls}
 
 \begin{code}
 module DsCCall 
@@ -14,6 +14,7 @@ module DsCCall
 
 #include "HsVersions.h"
 
+
 import CoreSyn
 
 import DsMonad
@@ -22,7 +23,8 @@ import CoreUtils      ( exprType, mkCoerce2 )
 import Id              ( Id, mkWildId )
 import MkId            ( mkFCallId, realWorldPrimId, mkPrimOpId )
 import Maybes          ( maybeToBool )
-import ForeignCall     ( ForeignCall(..), CCallSpec(..), CCallTarget(..), Safety, CCallConv(..) )
+import ForeignCall     ( ForeignCall(..), CCallSpec(..), CCallTarget(..), Safety, 
+                         CCallConv(..), CLabelString )
 import DataCon         ( splitProductType_maybe, dataConSourceArity, dataConWrapId )
 import ForeignCall     ( ForeignCall, CCallTarget(..) )
 
@@ -30,7 +32,7 @@ import TcType         ( tcSplitTyConApp_maybe )
 import Type            ( Type, isUnLiftedType, mkFunTys, mkFunTy,
                          tyVarsOfType, mkForAllTys, mkTyConApp, 
                          isPrimitiveType, splitTyConApp_maybe, 
-                         splitNewType_maybe, splitForAllTy_maybe,
+                         splitRecNewType_maybe, splitForAllTy_maybe,
                          isUnboxedTupleType
                        )
 
@@ -50,7 +52,6 @@ import TysWiredIn     ( unitDataConId,
                        )
 import BasicTypes       ( Boxity(..) )
 import Literal         ( mkMachInt )
-import CStrings                ( CLabelString )
 import PrelNames       ( Unique, hasKey, ioTyConKey, boolTyConKey, unitTyConKey,
                          int8TyConKey, int16TyConKey, int32TyConKey,
                          word8TyConKey, word16TyConKey, word32TyConKey
@@ -62,6 +63,11 @@ import PrelNames     ( Unique, hasKey, ioTyConKey, boolTyConKey, unitTyConKey,
 import VarSet          ( varSetElems )
 import Constants       ( wORD_SIZE)
 import Outputable
+
+#ifdef DEBUG
+import TypeRep
+#endif
+
 \end{code}
 
 Desugaring of @ccall@s consists of adding some state manipulation,
@@ -103,17 +109,15 @@ follows:
 dsCCall :: CLabelString        -- C routine to invoke
        -> [CoreExpr]   -- Arguments (desugared)
        -> Safety       -- Safety of the call
-       -> Bool         -- True <=> really a "_casm_"
        -> Type         -- Type of the result: IO t
        -> DsM CoreExpr
 
-dsCCall lbl args may_gc is_asm result_ty
+dsCCall lbl args may_gc result_ty
   = mapAndUnzipDs unboxArg args               `thenDs` \ (unboxed_args, arg_wrappers) ->
     boxResult [] id Nothing result_ty  `thenDs` \ (ccall_result_ty, res_wrapper) ->
-    getUniqueDs                               `thenDs` \ uniq ->
+    newUnique                         `thenDs` \ uniq ->
     let
-       target | is_asm    = CasmTarget lbl
-              | otherwise = StaticTarget lbl
+       target = StaticTarget lbl
        the_fcall    = CCall (CCallSpec target CCallConv may_gc)
        the_prim_app = mkFCall uniq the_fcall unboxed_args ccall_result_ty
     in
@@ -157,7 +161,7 @@ unboxArg arg
   = returnDs (arg, \body -> body)
 
   -- Recursive newtypes
-  | Just rep_ty <- splitNewType_maybe arg_ty
+  | Just rep_ty <- splitRecNewType_maybe arg_ty
   = unboxArg (mkCoerce2 rep_ty arg_ty arg)
       
   -- Booleans
@@ -174,7 +178,8 @@ unboxArg arg
   -- Data types with a single constructor, which has a single, primitive-typed arg
   -- This deals with Int, Float etc; also Ptr, ForeignPtr
   | is_product_type && data_con_arity == 1 
-  = ASSERT(isUnLiftedType data_con_arg_ty1 )   -- Typechecker ensures this
+  = ASSERT2(isUnLiftedType data_con_arg_ty1, pprType arg_ty)
+                       -- Typechecker ensures this
     newSysLocalDs arg_ty               `thenDs` \ case_bndr ->
     newSysLocalDs data_con_arg_ty1     `thenDs` \ prim_arg ->
     returnDs (Var prim_arg,
@@ -233,7 +238,7 @@ unboxArg arg
                       ])
 
   | otherwise
-  = getSrcLocDs `thenDs` \ l ->
+  = getSrcSpanDs `thenDs` \ l ->
     pprPanic "unboxArg: " (ppr l <+> ppr arg_ty)
   where
     arg_ty                                     = exprType arg
@@ -337,10 +342,10 @@ boxResult arg_ids augment mbTopCon result_ty
                -- The ccall returns a non-() value
         | isUnboxedTupleType prim_res_ty
         = let
-               (Just (_, ls@(prim_res_ty1:extras))) = splitTyConApp_maybe prim_res_ty
+               Just (_, ls) = splitTyConApp_maybe prim_res_ty
                arity = 1 + length ls
          in
-         mapDs newSysLocalDs ls                `thenDs` \ args_ids@(result_id:as) ->
+         mappM newSysLocalDs ls                `thenDs` \ args_ids@(result_id:as) ->
          newSysLocalDs realWorldStatePrimTy    `thenDs` \ state_id ->
          let
                the_rhs = return_result (Var state_id) 
@@ -354,8 +359,7 @@ boxResult arg_ids augment mbTopCon result_ty
          in
          returnDs (ccall_res_ty, the_alt)
        | otherwise
-       =       
-         newSysLocalDs prim_res_ty             `thenDs` \ result_id ->
+       = newSysLocalDs prim_res_ty             `thenDs` \ result_id ->
          newSysLocalDs realWorldStatePrimTy    `thenDs` \ state_id ->
          let
                the_rhs = return_result (Var state_id) 
@@ -387,7 +391,7 @@ resultWrapper result_ty
                                    (LitAlt (mkMachInt 0),[],Var falseDataConId)])
 
   -- Recursive newtypes
-  | Just rep_ty <- splitNewType_maybe result_ty
+  | Just rep_ty <- splitRecNewType_maybe result_ty
   = resultWrapper rep_ty `thenDs` \ (maybe_ty, wrapper) ->
     returnDs (maybe_ty, \e -> mkCoerce2 result_ty rep_ty (wrapper e))