Desugaring foreign calls
\begin{code}
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
module DsCCall
( dsCCall
, mkFCall
import DsMonad
import CoreUtils
-import Id
+import MkCore
+import Var
import MkId
import Maybes
import ForeignCall
dsCCall lbl args may_gc result_ty
= do (unboxed_args, arg_wrappers) <- mapAndUnzipM unboxArg args
- (ccall_result_ty, res_wrapper) <- boxResult id Nothing result_ty
+ (ccall_result_ty, res_wrapper) <- boxResult result_ty
uniq <- newUnique
let
- target = StaticTarget lbl
+ target = StaticTarget lbl Nothing
the_fcall = CCall (CCallSpec target CCallConv may_gc)
the_prim_app = mkFCall uniq the_fcall unboxed_args ccall_result_ty
return (foldr ($) (res_wrapper the_prim_app) arg_wrappers)
= return (arg, \body -> body)
-- Recursive newtypes
- | Just(rep_ty, co) <- splitNewTypeRepCo_maybe arg_ty
+ | Just(_rep_ty, co) <- splitNewTypeRepCo_maybe arg_ty
= unboxArg (mkCoerce co arg)
-- Booleans
tc `hasKey` boolTyConKey
= do prim_arg <- newSysLocalDs intPrimTy
return (Var prim_arg,
- \ body -> Case (Case arg (mkWildId arg_ty) intPrimTy
+ \ body -> Case (mkWildCase arg arg_ty intPrimTy
[(DataAlt falseDataCon,[],mkIntLit 0),
(DataAlt trueDataCon, [],mkIntLit 1)])
-- In increasing tag order!
(arg3_tycon == byteArrayPrimTyCon ||
arg3_tycon == mutableByteArrayPrimTyCon)
= do case_bndr <- newSysLocalDs arg_ty
- vars@[l_var, r_var, arr_cts_var] <- newSysLocalsDs data_con_arg_tys
+ vars@[_l_var, _r_var, arr_cts_var] <- newSysLocalsDs data_con_arg_tys
return (Var arr_cts_var,
\ body -> Case arg case_bndr (exprType body) [(DataAlt data_con,vars,body)]
)
, arg
, Lam prim_string body
])
- | Just (tc, [arg_ty]) <- splitTyConApp_maybe arg_ty,
+ | Just (tc, [_]) <- splitTyConApp_maybe arg_ty,
tyConName tc == objectTyConName
-- Object; dotnet only
= do unpack_id <- dsLookupGlobalId marshalObjectName
\begin{code}
-boxResult :: ((Maybe Type, CoreExpr -> CoreExpr)
- -> (Maybe Type, CoreExpr -> CoreExpr))
- -> Maybe Id
- -> Type
+boxResult :: Type
-> DsM (Type, CoreExpr -> CoreExpr)
-- Takes the result of the user-level ccall:
-- where t' is the unwrapped form of t. If t is simply (), then
-- the result type will be
-- State# RealWorld -> (# State# RealWorld #)
---
--- The gruesome 'augment' and 'mbTopCon' are to do with .NET foreign calls
--- It looks a mess: I wonder if it could be refactored.
-boxResult augment mbTopCon result_ty
+boxResult result_ty
| Just (io_tycon, io_res_ty, co) <- tcSplitIOType_maybe result_ty
-- isIOType_maybe handles the case where the type is a
-- simple wrapping of IO. E.g.
-- another case, and a coercion.)
-- The result is IO t, so wrap the result in an IO constructor
= do { res <- resultWrapper io_res_ty
- ; let aug_res = augment res
- extra_result_tys
- = case aug_res of
+ ; let extra_result_tys
+ = case res of
(Just ty,_)
| isUnboxedTupleType ty
-> let (Just (_, ls)) = splitTyConApp_maybe ty in tail ls
(map Type (realWorldStatePrimTy : io_res_ty : extra_result_tys)
++ (state : anss))
- ; (ccall_res_ty, the_alt) <- mk_alt return_result aug_res
+ ; (ccall_res_ty, the_alt) <- mk_alt return_result res
; state_id <- newSysLocalDs realWorldStatePrimTy
; let io_data_con = head (tyConDataCons io_tycon)
- toIOCon = mbTopCon `orElse` dataConWrapId io_data_con
+ toIOCon = dataConWrapId io_data_con
wrap the_call = mkCoerceI (mkSymCoI co) $
mkApps (Var toIOCon)
[ Type io_res_ty,
Lam state_id $
- Case (App the_call (Var state_id))
- (mkWildId ccall_res_ty)
+ mkWildCase (App the_call (Var state_id))
+ ccall_res_ty
(coreAltType the_alt)
[the_alt]
]
; return (realWorldStatePrimTy `mkFunTy` ccall_res_ty, wrap) }
-boxResult augment mbTopCon result_ty
+boxResult result_ty
= do -- It isn't IO, so do unsafePerformIO
-- It's not conveniently available, so we inline it
res <- resultWrapper result_ty
- (ccall_res_ty, the_alt) <- mk_alt return_result (augment res)
+ (ccall_res_ty, the_alt) <- mk_alt return_result res
let
- wrap = \ the_call -> Case (App the_call (Var realWorldPrimId))
- (mkWildId ccall_res_ty)
- (coreAltType the_alt)
- [the_alt]
+ wrap = \ the_call -> mkWildCase (App the_call (Var realWorldPrimId))
+ ccall_res_ty
+ (coreAltType the_alt)
+ [the_alt]
return (realWorldStatePrimTy `mkFunTy` ccall_res_ty, wrap)
where
- return_result state [ans] = ans
- return_result _ _ = panic "return_result: expected single result"
+ return_result _ [ans] = ans
+ return_result _ _ = panic "return_result: expected single result"
+mk_alt :: (Expr Var -> [Expr Var] -> Expr Var)
+ -> (Maybe Type, Expr Var -> Expr Var)
+ -> DsM (Type, (AltCon, [Id], Expr Var))
mk_alt return_result (Nothing, wrap_result)
= do -- The ccall returns ()
state_id <- newSysLocalDs realWorldStatePrimTy
-- Base case 2: the unit type ()
| Just (tc,_) <- maybe_tc_app, tc `hasKey` unitTyConKey
- = return (Nothing, \e -> Var unitDataConId)
+ = return (Nothing, \_ -> Var unitDataConId)
-- Base case 3: the boolean type
| Just (tc,_) <- maybe_tc_app, tc `hasKey` boolTyConKey
= return
- (Just intPrimTy, \e -> Case e (mkWildId intPrimTy)
+ (Just intPrimTy, \e -> mkWildCase e intPrimTy
boolTy
[(DEFAULT ,[],Var trueDataConId ),
(LitAlt (mkMachInt 0),[],Var falseDataConId)])
\ e -> App (Var pack_id) e)
-- Objects; 'dotnet' only.
- | Just (tc, [arg_ty]) <- maybe_tc_app,
+ | Just (tc, [_]) <- maybe_tc_app,
tyConName tc == objectTyConName
= do pack_id <- dsLookupGlobalId unmarshalObjectName
return (Just addrPrimTy,
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