X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FdeSugar%2FDsCCall.lhs;h=576c72160895a2824adda74a073e5bd1e78cd9d3;hb=6b4e00e082b0f4f2445fabbfacae730576adfa2c;hp=e27f2615b38c74d0dcfaa5a90a51b7a50c181f2d;hpb=b0604aad2c311d8713c2497afa6373bd938d501b;p=ghc-hetmet.git diff --git a/ghc/compiler/deSugar/DsCCall.lhs b/ghc/compiler/deSugar/DsCCall.lhs index e27f261..576c721 100644 --- 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 @@ -14,41 +14,60 @@ module DsCCall #include "HsVersions.h" + import CoreSyn import DsMonad -import CoreUtils ( exprType ) -import Id ( Id, mkWildId, idType ) +import CoreUtils ( exprType, coreAltType, 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(..) ) -import TcType ( Type, isUnLiftedType, mkFunTys, mkFunTy, +import TcType ( tcSplitTyConApp_maybe ) +import Type ( Type, isUnLiftedType, mkFunTys, mkFunTy, tyVarsOfType, mkForAllTys, mkTyConApp, - isBoolTy, isUnitTy, isPrimitiveType, - tcSplitTyConApp_maybe + isPrimitiveType, splitTyConApp_maybe, + splitRecNewType_maybe, splitForAllTy_maybe, + isUnboxedTupleType ) -import Type ( repType, eqType ) -- Sees the representation type -import PrimOp ( PrimOp(TouchOp) ) -import TysPrim ( realWorldStatePrimTy, + +import PrimOp ( PrimOp(..) ) +import TysPrim ( realWorldStatePrimTy, intPrimTy, byteArrayPrimTyCon, mutableByteArrayPrimTyCon, - intPrimTy, foreignObjPrimTy + addrPrimTy ) -import TyCon ( tyConDataCons ) +import TyCon ( TyCon, tyConDataCons, tyConName ) import TysWiredIn ( unitDataConId, unboxedSingletonDataCon, unboxedPairDataCon, unboxedSingletonTyCon, unboxedPairTyCon, trueDataCon, falseDataCon, - trueDataConId, falseDataConId + trueDataConId, falseDataConId, + listTyCon, charTyCon, boolTy, + tupleTyCon, tupleCon ) +import BasicTypes ( Boxity(..) ) import Literal ( mkMachInt ) -import CStrings ( CLabelString ) -import PrelNames ( Unique, hasKey, ioTyConKey ) +import PrelNames ( Unique, hasKey, ioTyConKey, boolTyConKey, unitTyConKey, + int8TyConKey, int16TyConKey, int32TyConKey, + word8TyConKey, word16TyConKey, word32TyConKey + -- dotnet interop + , marshalStringName, unmarshalStringName + , marshalObjectName, unmarshalObjectName + , objectTyConName + ) 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, @@ -90,17 +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 - = mapAndUnzipDs unboxArg args `thenDs` \ (unboxed_args, arg_wrappers) -> - boxResult [] ({-repType-} result_ty) `thenDs` \ (ccall_result_ty, res_wrapper) -> - getUniqueDs `thenDs` \ uniq -> +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) -> + 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 @@ -143,24 +160,32 @@ unboxArg arg | isPrimitiveType arg_ty = returnDs (arg, \body -> body) + -- Recursive newtypes + | Just rep_ty <- splitRecNewType_maybe arg_ty + = unboxArg (mkCoerce2 rep_ty arg_ty arg) + -- Booleans - | isBoolTy arg_ty + | Just (tc,_) <- splitTyConApp_maybe arg_ty, + tc `hasKey` boolTyConKey = newSysLocalDs intPrimTy `thenDs` \ prim_arg -> returnDs (Var prim_arg, - \ body -> Case (Case arg (mkWildId arg_ty) + \ body -> Case (Case arg (mkWildId arg_ty) intPrimTy [(DataAlt falseDataCon,[],mkIntLit 0), (DataAlt trueDataCon, [],mkIntLit 1)]) - prim_arg + -- In increasing tag order! + prim_arg + (exprType body) [(DEFAULT,[],body)]) -- Data types with a single constructor, which has a single, primitive-typed arg - -- This deals with Int, Float etc + -- 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, - \ body -> Case arg case_bndr [(DataAlt data_con,[prim_arg],body)] + \ body -> Case arg case_bndr (exprType body) [(DataAlt data_con,[prim_arg],body)] ) -- Byte-arrays, both mutable and otherwise; hack warning @@ -176,18 +201,50 @@ unboxArg arg = newSysLocalDs arg_ty `thenDs` \ case_bndr -> newSysLocalsDs data_con_arg_tys `thenDs` \ vars@[l_var, r_var, arr_cts_var] -> returnDs (Var arr_cts_var, - \ body -> Case arg case_bndr [(DataAlt data_con,vars,body)] + \ body -> Case arg case_bndr (exprType body) [(DataAlt data_con,vars,body)] + ) + | Just (tc, [arg_ty]) <- splitTyConApp_maybe arg_ty, + tc == listTyCon, + Just (cc,[]) <- splitTyConApp_maybe arg_ty, + cc == charTyCon + -- String; dotnet only + = dsLookupGlobalId marshalStringName `thenDs` \ unpack_id -> + newSysLocalDs addrPrimTy `thenDs` \ prim_string -> + returnDs (Var prim_string, + \ body -> + let + io_ty = exprType body + (Just (_,[io_arg])) = tcSplitTyConApp_maybe io_ty + in + mkApps (Var unpack_id) + [ Type io_arg + , arg + , Lam prim_string body + ]) + | Just (tc, [arg_ty]) <- splitTyConApp_maybe arg_ty, + tyConName tc == objectTyConName + -- Object; dotnet only + = dsLookupGlobalId marshalObjectName `thenDs` \ unpack_id -> + newSysLocalDs addrPrimTy `thenDs` \ prim_obj -> + returnDs (Var prim_obj, + \ body -> + let + io_ty = exprType body + (Just (_,[io_arg])) = tcSplitTyConApp_maybe io_ty + in + mkApps (Var unpack_id) + [ Type io_arg + , arg + , Lam prim_obj body + ]) + | otherwise - = getSrcLocDs `thenDs` \ l -> + = getSrcSpanDs `thenDs` \ l -> pprPanic "unboxArg: " (ppr l <+> ppr arg_ty) where - arg_ty = repType (exprType arg) - -- The repType looks through any newtype or - -- implicit-parameter wrappings on the argument; - -- this is necessary, because isBoolTy (in particular) does not. - + arg_ty = exprType arg maybe_product_type = splitProductType_maybe arg_ty is_product_type = maybeToBool maybe_product_type Just (_, _, data_con, data_con_arg_tys) = maybe_product_type @@ -195,13 +252,17 @@ unboxArg arg (data_con_arg_ty1 : _) = data_con_arg_tys (_ : _ : data_con_arg_ty3 : _) = data_con_arg_tys - maybe_arg3_tycon = tcSplitTyConApp_maybe data_con_arg_ty3 + maybe_arg3_tycon = splitTyConApp_maybe data_con_arg_ty3 Just (arg3_tycon,_) = maybe_arg3_tycon \end{code} \begin{code} -boxResult :: [Id] -> Type -> DsM (Type, CoreExpr -> CoreExpr) +boxResult :: [Id] + -> ((Maybe Type, CoreExpr -> CoreExpr) -> (Maybe Type, CoreExpr -> CoreExpr)) + -> Maybe Id + -> Type + -> DsM (Type, CoreExpr -> CoreExpr) -- Takes the result of the user-level ccall: -- either (IO t), @@ -214,121 +275,185 @@ boxResult :: [Id] -> Type -> DsM (Type, CoreExpr -> CoreExpr) -- the result type will be -- State# RealWorld -> (# State# RealWorld #) --- Here is where we arrange that ForeignPtrs which are passed to a 'safe' --- foreign import don't get finalized until the call returns. For each --- argument of type ForeignObj# we arrange to touch# the argument after --- the call. The arg_ids passed in are the Ids passed to the actual ccall. - -boxResult arg_ids result_ty +boxResult arg_ids augment mbTopCon result_ty = case tcSplitTyConApp_maybe result_ty of -- 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. -- The result is IO t, so wrap the result in an IO constructor Just (io_tycon, [io_res_ty]) | io_tycon `hasKey` ioTyConKey - -> mk_alt return_result - (resultWrapper io_res_ty) `thenDs` \ (ccall_res_ty, the_alt) -> - newSysLocalDs realWorldStatePrimTy `thenDs` \ state_id -> + -> resultWrapper io_res_ty `thenDs` \ res -> + let aug_res = augment res + extra_result_tys = + case aug_res of + (Just ty,_) + | isUnboxedTupleType ty -> + let (Just (_, ls)) = splitTyConApp_maybe ty in tail ls + _ -> [] + in + mk_alt (return_result extra_result_tys) aug_res + `thenDs` \ (ccall_res_ty, the_alt) -> + newSysLocalDs realWorldStatePrimTy `thenDs` \ state_id -> let io_data_con = head (tyConDataCons io_tycon) + toIOCon = + case mbTopCon of + Nothing -> dataConWrapId io_data_con + Just x -> x wrap = \ the_call -> - mkApps (Var (dataConWrapId io_data_con)) + mkApps (Var toIOCon) [ Type io_res_ty, Lam state_id $ Case (App the_call (Var state_id)) (mkWildId ccall_res_ty) + (coreAltType the_alt) [the_alt] ] in returnDs (realWorldStatePrimTy `mkFunTy` ccall_res_ty, wrap) where - return_result state ans = mkConApp unboxedPairDataCon - [Type realWorldStatePrimTy, Type io_res_ty, - state, ans] - + return_result ts state anss + = mkConApp (tupleCon Unboxed (2 + length ts)) + (Type realWorldStatePrimTy : Type io_res_ty : map Type ts ++ + state : anss) -- It isn't, so do unsafePerformIO -- It's not conveniently available, so we inline it - other -> mk_alt return_result - (resultWrapper result_ty) `thenDs` \ (ccall_res_ty, the_alt) -> + other -> resultWrapper result_ty `thenDs` \ res -> + mk_alt return_result (augment res) `thenDs` \ (ccall_res_ty, the_alt) -> let wrap = \ the_call -> Case (App the_call (Var realWorldPrimId)) (mkWildId ccall_res_ty) + (coreAltType the_alt) [the_alt] in returnDs (realWorldStatePrimTy `mkFunTy` ccall_res_ty, wrap) where - return_result state ans = ans + return_result state [ans] = ans + return_result _ _ = panic "return_result: expected single result" where mk_alt return_result (Nothing, wrap_result) = -- The ccall returns () - let - rhs_fun state_id = return_result (Var state_id) - (wrap_result (panic "boxResult")) - in newSysLocalDs realWorldStatePrimTy `thenDs` \ state_id -> - mkTouches arg_ids state_id rhs_fun `thenDs` \ the_rhs -> let + the_rhs = return_result (Var state_id) + [wrap_result (panic "boxResult")] + ccall_res_ty = mkTyConApp unboxedSingletonTyCon [realWorldStatePrimTy] the_alt = (DataAlt unboxedSingletonDataCon, [state_id], the_rhs) in returnDs (ccall_res_ty, the_alt) mk_alt return_result (Just prim_res_ty, wrap_result) - = -- The ccall returns a non-() value - newSysLocalDs prim_res_ty `thenDs` \ result_id -> + -- The ccall returns a non-() value + | isUnboxedTupleType prim_res_ty + = let + Just (_, ls) = splitTyConApp_maybe prim_res_ty + arity = 1 + length ls + in + mappM newSysLocalDs ls `thenDs` \ args_ids@(result_id:as) -> + newSysLocalDs realWorldStatePrimTy `thenDs` \ state_id -> let - rhs_fun state_id = return_result (Var state_id) - (wrap_result (Var result_id)) + the_rhs = return_result (Var state_id) + (wrap_result (Var result_id) : map Var as) + ccall_res_ty = mkTyConApp (tupleTyCon Unboxed arity) + (realWorldStatePrimTy : ls) + the_alt = ( DataAlt (tupleCon Unboxed arity) + , (state_id : args_ids) + , the_rhs + ) in + returnDs (ccall_res_ty, the_alt) + | otherwise + = newSysLocalDs prim_res_ty `thenDs` \ result_id -> newSysLocalDs realWorldStatePrimTy `thenDs` \ state_id -> - mkTouches arg_ids state_id rhs_fun `thenDs` \ the_rhs -> let + the_rhs = return_result (Var state_id) + [wrap_result (Var result_id)] + ccall_res_ty = mkTyConApp unboxedPairTyCon [realWorldStatePrimTy, prim_res_ty] the_alt = (DataAlt unboxedPairDataCon, [state_id, result_id], the_rhs) in returnDs (ccall_res_ty, the_alt) -touchzh = mkPrimOpId TouchOp - -mkTouches [] s cont = returnDs (cont s) -mkTouches (v:vs) s cont - | not (idType v `eqType` foreignObjPrimTy) = mkTouches vs s cont - | otherwise = newSysLocalDs realWorldStatePrimTy `thenDs` \s' -> - mkTouches vs s' cont `thenDs` \ rest -> - returnDs (Case (mkApps (Var touchzh) [Type foreignObjPrimTy, - Var v, Var s]) s' - [(DEFAULT, [], rest)]) resultWrapper :: Type - -> (Maybe Type, -- Type of the expected result, if any - CoreExpr -> CoreExpr) -- Wrapper for the result + -> DsM (Maybe Type, -- Type of the expected result, if any + CoreExpr -> CoreExpr) -- Wrapper for the result resultWrapper result_ty -- Base case 1: primitive types - | isPrimitiveType result_ty_rep - = (Just result_ty, \e -> e) + | isPrimitiveType result_ty + = returnDs (Just result_ty, \e -> e) -- Base case 2: the unit type () - | isUnitTy result_ty_rep - = (Nothing, \e -> Var unitDataConId) + | Just (tc,_) <- maybe_tc_app, tc `hasKey` unitTyConKey + = returnDs (Nothing, \e -> Var unitDataConId) -- Base case 3: the boolean type - | isBoolTy result_ty_rep - = (Just intPrimTy, \e -> Case e (mkWildId intPrimTy) - [(DEFAULT ,[],Var trueDataConId ), - (LitAlt (mkMachInt 0),[],Var falseDataConId)]) + | Just (tc,_) <- maybe_tc_app, tc `hasKey` boolTyConKey + = returnDs + (Just intPrimTy, \e -> Case e (mkWildId intPrimTy) + boolTy + [(DEFAULT ,[],Var trueDataConId ), + (LitAlt (mkMachInt 0),[],Var falseDataConId)]) + + -- Recursive newtypes + | 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)) + + -- The type might contain foralls (eg. for dummy type arguments, + -- referring to 'Ptr a' is legal). + | Just (tyvar, rest) <- splitForAllTy_maybe result_ty + = resultWrapper rest `thenDs` \ (maybe_ty, wrapper) -> + returnDs (maybe_ty, \e -> Lam tyvar (wrapper e)) -- Data types with a single constructor, which has a single arg - | Just (_, tycon_arg_tys, data_con, data_con_arg_tys) <- splitProductType_maybe result_ty_rep, + -- This includes types like Ptr and ForeignPtr + | Just (tycon, tycon_arg_tys, data_con, data_con_arg_tys) <- splitProductType_maybe result_ty, dataConSourceArity data_con == 1 = let - (maybe_ty, wrapper) = resultWrapper unwrapped_res_ty (unwrapped_res_ty : _) = data_con_arg_tys + narrow_wrapper = maybeNarrow tycon in - (maybe_ty, \e -> mkApps (Var (dataConWrapId data_con)) - (map Type tycon_arg_tys ++ [wrapper e])) + resultWrapper unwrapped_res_ty `thenDs` \ (maybe_ty, wrapper) -> + returnDs + (maybe_ty, \e -> mkApps (Var (dataConWrapId data_con)) + (map Type tycon_arg_tys ++ [wrapper (narrow_wrapper e)])) + + -- Strings; 'dotnet' only. + | Just (tc, [arg_ty]) <- maybe_tc_app, tc == listTyCon, + Just (cc,[]) <- splitTyConApp_maybe arg_ty, cc == charTyCon + = dsLookupGlobalId unmarshalStringName `thenDs` \ pack_id -> + returnDs (Just addrPrimTy, + \ e -> App (Var pack_id) e) + + -- Objects; 'dotnet' only. + | Just (tc, [arg_ty]) <- maybe_tc_app, + tyConName tc == objectTyConName + = dsLookupGlobalId unmarshalObjectName `thenDs` \ pack_id -> + returnDs (Just addrPrimTy, + \ e -> App (Var pack_id) e) | otherwise = pprPanic "resultWrapper" (ppr result_ty) where - result_ty_rep = repType result_ty -- Look through any newtypes/implicit parameters + maybe_tc_app = splitTyConApp_maybe result_ty + +-- When the result of a foreign call is smaller than the word size, we +-- need to sign- or zero-extend the result up to the word size. The C +-- standard appears to say that this is the responsibility of the +-- caller, not the callee. + +maybeNarrow :: TyCon -> (CoreExpr -> CoreExpr) +maybeNarrow tycon + | tycon `hasKey` int8TyConKey = \e -> App (Var (mkPrimOpId Narrow8IntOp)) e + | tycon `hasKey` int16TyConKey = \e -> App (Var (mkPrimOpId Narrow16IntOp)) e + | tycon `hasKey` int32TyConKey + && wORD_SIZE > 4 = \e -> App (Var (mkPrimOpId Narrow32IntOp)) e + + | tycon `hasKey` word8TyConKey = \e -> App (Var (mkPrimOpId Narrow8WordOp)) e + | tycon `hasKey` word16TyConKey = \e -> App (Var (mkPrimOpId Narrow16WordOp)) e + | tycon `hasKey` word32TyConKey + && wORD_SIZE > 4 = \e -> App (Var (mkPrimOpId Narrow32WordOp)) e + | otherwise = id \end{code}