X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FdeSugar%2FDsCCall.lhs;h=35722fae20d7407dfe710a2f2575addfdd970e9e;hb=783e505e2d884f94d30ec8074e590507f2561c49;hp=bac1e98a6927848da6a02b54df8942f09cba48ef;hpb=2c8f04b5b883db74f449dfc8c224929fe28b027d;p=ghc-hetmet.git diff --git a/ghc/compiler/deSugar/DsCCall.lhs b/ghc/compiler/deSugar/DsCCall.lhs index bac1e98..35722fa 100644 --- a/ghc/compiler/deSugar/DsCCall.lhs +++ b/ghc/compiler/deSugar/DsCCall.lhs @@ -1,10 +1,18 @@ % -% (c) The AQUA Project, Glasgow University, 1994-1996 +% (c) The AQUA Project, Glasgow University, 1994-1998 % \section[DsCCall]{Desugaring \tr{_ccall_}s and \tr{_casm_}s} \begin{code} -module DsCCall ( dsCCall ) where +module DsCCall + ( dsCCall + , mkCCall + , unboxArg + , boxResult + , wrapUnboxedValue + , can'tSeeDataConsPanic + + ) where #include "HsVersions.h" @@ -14,22 +22,25 @@ import DsMonad import DsUtils import TcHsSyn ( maybeBoxedPrimType ) -import CoreUtils ( coreExprType ) -import Id ( Id(..), dataConArgTys, idType ) +import CoreUtils ( exprType ) +import Id ( Id, mkWildId ) +import MkId ( mkCCallOpId ) import Maybes ( maybeToBool ) -import PrelVals ( packStringForCId ) -import PrimOp ( PrimOp(..) ) -import Type ( isUnpointedType, splitAlgTyConApp_maybe, - splitTyConApp_maybe, splitFunTys, splitForAllTys, - Type +import PrelInfo ( packStringForCId ) +import PrimOp ( PrimOp(..), CCall(..), CCallTarget(..) ) +import DataCon ( DataCon, splitProductType_maybe ) +import CallConv +import Type ( isUnLiftedType, splitAlgTyConApp_maybe, mkFunTys, + splitTyConApp_maybe, tyVarsOfType, mkForAllTys, Type ) -import TyCon ( tyConDataCons ) import TysPrim ( byteArrayPrimTy, realWorldStatePrimTy, byteArrayPrimTyCon, mutableByteArrayPrimTyCon ) -import TysWiredIn ( getStatePairingConInfo, - unitDataCon, stringTy, - realWorldStateTy, stateDataCon +import TysWiredIn ( unitDataConId, stringTy, + unboxedPairDataCon, + mkUnboxedTupleTy, unboxedTupleCon ) +import Unique ( Unique ) +import VarSet ( varSetElems ) import Outputable \end{code} @@ -76,27 +87,41 @@ dsCCall :: FAST_STRING -- C routine to invoke -> Type -- Type of the result (a boxed-prim IO type) -> DsM CoreExpr -dsCCall label args may_gc is_asm io_result_ty +dsCCall lbl args may_gc is_asm result_ty = newSysLocalDs realWorldStatePrimTy `thenDs` \ old_s -> mapAndUnzipDs unboxArg args `thenDs` \ (unboxed_args, arg_wrappers) -> + boxResult result_ty `thenDs` \ (final_result_ty, res_wrapper) -> + getUniqueDs `thenDs` \ uniq -> let - final_args = Var old_s : unboxed_args - (ioOkDataCon, result_ty) = getIoOkDataCon io_result_ty + val_args = Var old_s : unboxed_args + the_ccall = CCall (StaticTarget lbl) is_asm may_gc cCallConv + the_prim_app = mkCCall uniq the_ccall val_args final_result_ty + the_body = foldr ($) (res_wrapper the_prim_app) arg_wrappers in - - boxResult ioOkDataCon result_ty `thenDs` \ (final_result_ty, res_wrapper) -> - - let - the_ccall_op = CCallOp label is_asm may_gc - (map coreExprType final_args) - final_result_ty - in - mkPrimDs the_ccall_op (map VarArg final_args) `thenDs` \ the_prim_app -> - let - the_body = foldr ($) (res_wrapper the_prim_app) arg_wrappers - in - returnDs (Lam (ValBinder old_s) the_body) + returnDs (Lam old_s the_body) + +mkCCall :: Unique -> CCall + -> [CoreExpr] -- Args + -> Type -- Result type + -> CoreExpr +-- Construct the ccall. The only tricky bit is that the ccall Id should have +-- no free vars, so if any of the arg tys do we must give it a polymorphic type. +-- [I forget *why* it should have no free vars!] +-- For example: +-- mkCCall ... [s::StablePtr (a->b), x::Addr, c::Char] +-- +-- Here we build a ccall thus +-- (ccallid::(forall a b. StablePtr (a -> b) -> Addr -> Char -> IO Addr)) +-- a b s x c +mkCCall uniq the_ccall val_args res_ty + = mkApps (mkVarApps (Var the_ccall_id) tyvars) val_args + where + arg_tys = map exprType val_args + body_ty = (mkFunTys arg_tys res_ty) + tyvars = varSetElems (tyVarsOfType body_ty) + ty = mkForAllTys tyvars body_ty + the_ccall_id = mkCCallOpId uniq the_ccall ty \end{code} \begin{code} @@ -116,169 +141,148 @@ unboxArg arg -- which generates the boiler-plate box-unbox code for you, i.e., it may help -- us nuke this very module :-) -- - | isUnpointedType arg_ty + | isUnLiftedType arg_ty = returnDs (arg, \body -> body) -- Strings | arg_ty == stringTy -- ToDo (ADR): - allow synonyms of Strings too? = newSysLocalDs byteArrayPrimTy `thenDs` \ prim_arg -> - mkAppDs (Var packStringForCId) [VarArg arg] `thenDs` \ pack_appn -> returnDs (Var prim_arg, - \body -> Case pack_appn (PrimAlts [] - (BindDefault prim_arg body)) - ) - - | null data_cons - -- oops: we can't see the data constructors!!! - = can't_see_datacons_error "argument" arg_ty + \body -> Case (App (Var packStringForCId) arg) + prim_arg [(DEFAULT,[],body)]) -- Byte-arrays, both mutable and otherwise; hack warning - | is_data_type && - length data_con_arg_tys == 2 && - maybeToBool maybe_arg2_tycon && - (arg2_tycon == byteArrayPrimTyCon || - arg2_tycon == mutableByteArrayPrimTyCon) + | is_product_type && + length data_con_arg_tys == 3 && + maybeToBool maybe_arg3_tycon && + (arg3_tycon == byteArrayPrimTyCon || + arg3_tycon == mutableByteArrayPrimTyCon) -- and, of course, it is an instance of CCallable - = newSysLocalsDs data_con_arg_tys `thenDs` \ vars@[ixs_var, arr_cts_var] -> + = 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 (AlgAlts [(the_data_con,vars,body)] - NoDefault) + \ body -> Case arg case_bndr [(DataAlt data_con,vars,body)] ) -- Data types with a single constructor, which has a single, primitive-typed arg | maybeToBool maybe_boxed_prim_arg_ty - = newSysLocalDs the_prim_arg_ty `thenDs` \ prim_arg -> + = newSysLocalDs arg_ty `thenDs` \ case_bndr -> + newSysLocalDs the_prim_arg_ty `thenDs` \ prim_arg -> returnDs (Var prim_arg, - \ body -> Case arg (AlgAlts [(box_data_con,[prim_arg],body)] - NoDefault) + \ body -> Case arg case_bndr [(DataAlt box_data_con,[prim_arg],body)] ) | otherwise = getSrcLocDs `thenDs` \ l -> pprPanic "unboxArg: " (ppr l <+> ppr arg_ty) where - arg_ty = coreExprType arg + arg_ty = exprType arg maybe_boxed_prim_arg_ty = maybeBoxedPrimType arg_ty (Just (box_data_con, the_prim_arg_ty)) = maybe_boxed_prim_arg_ty - maybe_data_type = splitAlgTyConApp_maybe arg_ty - is_data_type = maybeToBool maybe_data_type - (Just (tycon, tycon_arg_tys, data_cons)) = maybe_data_type - (the_data_con : other_data_cons) = data_cons + maybe_product_type = splitProductType_maybe arg_ty + is_product_type = maybeToBool maybe_product_type + Just (tycon, _, data_con, data_con_arg_tys) = maybe_product_type + (data_con_arg_ty1 : data_con_arg_ty2 : data_con_arg_ty3 :_) + = data_con_arg_tys - data_con_arg_tys = dataConArgTys the_data_con tycon_arg_tys - (data_con_arg_ty1 : data_con_arg_ty2 : _) = data_con_arg_tys + maybe_arg3_tycon = splitTyConApp_maybe data_con_arg_ty3 + Just (arg3_tycon,_) = maybe_arg3_tycon - maybe_arg2_tycon = splitTyConApp_maybe data_con_arg_ty2 - Just (arg2_tycon,_) = maybe_arg2_tycon - -can't_see_datacons_error thing ty - = pprPanic "ERROR: Can't see the data constructor(s) for _ccall_/_casm_ " - (hcat [text thing, text "; type: ", ppr ty, text "(try compiling with -fno-prune-tydecls ..)\n"]) +can'tSeeDataConsPanic thing ty + = pprPanic + "ERROR: Can't see the data constructor(s) for _ccall_/_casm_/foreign declaration" + (hcat [ text thing, text "; type: ", ppr ty + , text "(try compiling with -fno-prune-tydecls ..)\n"]) \end{code} \begin{code} -boxResult :: Id -- IOok constructor - -> Type -- Type of desired result +boxResult :: Type -- Type of desired result -> DsM (Type, -- Type of the result of the ccall itself CoreExpr -> CoreExpr) -- Wrapper for the ccall -- to box the result -boxResult ioOkDataCon result_ty - | null data_cons - -- oops! can't see the data constructors - = can't_see_datacons_error "result" result_ty - - -- Data types with a single constructor, which has a single, primitive-typed arg - | (maybeToBool maybe_data_type) && -- Data type - (null other_data_cons) && -- Just one constr - not (null data_con_arg_tys) && null other_args_tys && -- Just one arg - isUnpointedType the_prim_result_ty -- of primitive type +boxResult result_ty + -- Data types with a single nullary constructor + | (maybeToBool maybe_product_type) && -- Data type + (null data_con_arg_tys) = newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id -> - newSysLocalDs the_prim_result_ty `thenDs` \ prim_result_id -> - - mkConDs the_data_con (map TyArg tycon_arg_tys ++ [VarArg (Var prim_result_id)]) `thenDs` \ the_result -> - +{- + wrapUnboxedValue result_ty `thenDs` \ (state_and_prim_datacon, + state_and_prim_ty, prim_result_id, the_result) -> mkConDs ioOkDataCon [TyArg result_ty, VarArg (Var prim_state_id), VarArg the_result] `thenDs` \ the_pair -> +-} let - the_alt = (state_and_prim_datacon, [prim_state_id, prim_result_id], the_pair) + the_pair = mkConApp unboxedPairDataCon + [Type realWorldStatePrimTy, Type result_ty, + Var prim_state_id, + Var unitDataConId] + the_alt = (DataAlt (unboxedTupleCon 1), [prim_state_id], the_pair) + scrut_ty = mkUnboxedTupleTy 1 [realWorldStatePrimTy] in - returnDs (state_and_prim_ty, - \prim_app -> Case prim_app (AlgAlts [the_alt] NoDefault) + returnDs (scrut_ty, \prim_app -> Case prim_app (mkWildId scrut_ty) [the_alt] ) - -- Data types with a single nullary constructor - | (maybeToBool maybe_data_type) && -- Data type - (null other_data_cons) && -- Just one constr - (null data_con_arg_tys) + -- Data types with a single constructor, which has a single, primitive-typed arg + | (maybeToBool maybe_product_type) && -- Data type + not (null data_con_arg_tys) && null other_args_tys && -- Just one arg + isUnLiftedType the_prim_result_ty -- of primitive type = newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id -> - - mkConDs ioOkDataCon - [TyArg result_ty, VarArg (Var prim_state_id), VarArg (Var unitDataCon)] - `thenDs` \ the_pair -> + newSysLocalDs the_prim_result_ty `thenDs` \ prim_result_id -> + newSysLocalDs ccall_res_type `thenDs` \ case_bndr -> let - the_alt = (stateDataCon, [prim_state_id], the_pair) + the_result = mkConApp data_con (map Type tycon_arg_tys ++ [Var prim_result_id]) + the_pair = mkConApp unboxedPairDataCon + [Type realWorldStatePrimTy, Type result_ty, + Var prim_state_id, the_result] + the_alt = (DataAlt unboxedPairDataCon, [prim_state_id, prim_result_id], the_pair) in - returnDs (realWorldStateTy, - \prim_app -> Case prim_app (AlgAlts [the_alt] NoDefault) + returnDs (ccall_res_type, \prim_app -> Case prim_app case_bndr [the_alt] ) | otherwise = pprPanic "boxResult: " (ppr result_ty) - where - maybe_data_type = splitAlgTyConApp_maybe result_ty - Just (tycon, tycon_arg_tys, data_cons) = maybe_data_type - (the_data_con : other_data_cons) = data_cons - - data_con_arg_tys = dataConArgTys the_data_con tycon_arg_tys - (the_prim_result_ty : other_args_tys) = data_con_arg_tys + maybe_product_type = splitProductType_maybe result_ty + Just (tycon, tycon_arg_tys, data_con, data_con_arg_tys) = maybe_product_type + (the_prim_result_ty : other_args_tys) = data_con_arg_tys - (state_and_prim_datacon, state_and_prim_ty) = getStatePairingConInfo the_prim_result_ty -\end{code} + ccall_res_type = mkUnboxedTupleTy 2 [realWorldStatePrimTy, the_prim_result_ty] -This grimy bit of code is for digging out the IOok constructor from an -application of the the IO type. The constructor is needed for -wrapping the result of a _ccall_. The alternative is to wire-in IO, -which brings a whole heap of junk with it. - -If the representation of IO changes, this will probably have to be -brought in line with the new definition. - -newtype IO a = IO (State# RealWorld -> IOResult a) - -the constructor IO has type (State# RealWorld -> IOResult a) -> IO a - -\begin{code} -getIoOkDataCon :: Type -- IO t - -> (Id,Type) -- Returns (IOok, t) - -getIoOkDataCon io_ty - = let - Just (ioTyCon, [t]) = splitTyConApp_maybe io_ty - [ioDataCon] = tyConDataCons ioTyCon - ioDataConTy = idType ioDataCon - (_, ioDataConTy') = splitForAllTys ioDataConTy - ([arg_ty], _) = splitFunTys ioDataConTy' - (_, io_result_ty) = splitFunTys arg_ty - Just (io_result_tycon, _) = splitTyConApp_maybe io_result_ty - [ioOkDataCon,ioFailDataCon] = tyConDataCons io_result_tycon +-- wrap up an unboxed value. +wrapUnboxedValue :: Type -> DsM (Type, Id, CoreExpr) +wrapUnboxedValue ty + | (maybeToBool maybe_product_type) && -- Data type + not (null data_con_arg_tys) && null other_args_tys && -- Just one arg + isUnLiftedType the_prim_result_ty -- of primitive type + = + newSysLocalDs the_prim_result_ty `thenDs` \ prim_result_id -> + let + the_result = mkConApp data_con (map Type tycon_arg_tys ++ [Var prim_result_id]) in - (ioOkDataCon, t) -\end{code} + returnDs (ccall_res_type, prim_result_id, the_result) -Another way to do it, more sensitive: + -- Data types with a single nullary constructor + | (maybeToBool maybe_product_type) && -- Data type + (null data_con_arg_tys) + = + let + scrut_ty = mkUnboxedTupleTy 1 [realWorldStatePrimTy] + in + returnDs (scrut_ty, unitDataConId, Var unitDataConId) - case ioDataConTy of - ForAll _ (FunTy (FunTy _ (AppTy (TyConTy ioResultTyCon _) _)) _) -> - let [ioOkDataCon,ioFailDataCon] = tyConDataCons ioResultTyCon - in - (ioOkDataCon, result_ty) - _ -> pprPanic "getIoOkDataCon: " (ppr PprDebug ioDataConTy) + | otherwise + = pprPanic "boxResult: " (ppr ty) + where + maybe_product_type = splitProductType_maybe ty + Just (tycon, tycon_arg_tys, data_con, data_con_arg_tys) = maybe_product_type + (the_prim_result_ty : other_args_tys) = data_con_arg_tys + ccall_res_type = mkUnboxedTupleTy 2 [realWorldStatePrimTy, the_prim_result_ty] +\end{code}