X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FdeSugar%2FDsCCall.lhs;h=08fa624be7f7892d0a8c0ff824e542a5300b0750;hb=438596897ebbe25a07e1c82085cfbc5bdb00f09e;hp=e19eddf902538c3e2e1bcc1c2301cd761f7c5a60;hpb=7b0181919416d8f04324575b7e17031ca692f5b0;p=ghc-hetmet.git diff --git a/ghc/compiler/deSugar/DsCCall.lhs b/ghc/compiler/deSugar/DsCCall.lhs index e19eddf..08fa624 100644 --- a/ghc/compiler/deSugar/DsCCall.lhs +++ b/ghc/compiler/deSugar/DsCCall.lhs @@ -1,35 +1,44 @@ % -% (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} -#include "HsVersions.h" - -module DsCCall ( dsCCall ) where +module DsCCall + ( dsCCall + , unboxArg + , boxResult + , wrapUnboxedValue + , can'tSeeDataConsPanic + + ) where -import Ubiq +#include "HsVersions.h" import CoreSyn import DsMonad import DsUtils +import TcHsSyn ( maybeBoxedPrimType ) import CoreUtils ( coreExprType ) -import Id ( dataConArgTys, mkTupleCon ) +import Id ( Id, mkWildId ) +import Const ( Con(..) ) import Maybes ( maybeToBool ) -import PprStyle ( PprStyle(..) ) -import PprType ( GenType{-instances-} ) -import PrelInfo ( byteArrayPrimTy, getStatePairingConInfo, - packStringForCId, realWorldStatePrimTy, - realWorldStateTy, realWorldTy, stateDataCon, - stringTy ) -import Pretty +import PrelInfo ( packStringForCId ) import PrimOp ( PrimOp(..) ) -import Type ( isPrimType, maybeAppDataTyCon, eqTy ) -import Util ( pprPanic, pprError, panic ) - -maybeBoxedPrimType = panic "DsCCall.maybeBoxedPrimType" +import DataCon ( DataCon, dataConId, dataConArgTys ) +import CallConv +import Type ( isUnLiftedType, splitAlgTyConApp_maybe, mkFunTys, + splitTyConApp_maybe, Type + ) +import TysPrim ( byteArrayPrimTy, realWorldStatePrimTy, + byteArrayPrimTyCon, mutableByteArrayPrimTyCon ) +import TysWiredIn ( unitDataCon, stringTy, + mkUnboxedTupleTy, unboxedPairDataCon, + mkUnboxedTupleTy, unboxedTupleCon + ) +import Outputable \end{code} Desugaring of @ccall@s consists of adding some state manipulation, @@ -37,7 +46,7 @@ unboxing any boxed primitive arguments and boxing the result if desired. The state stuff just consists of adding in -@\ s -> case s of { S# s# -> ... }@ in an appropriate place. +@PrimIO (\ s -> case s of { S# s# -> ... })@ in an appropriate place. The unboxing is straightforward, as all information needed to unbox is available from the type. For each boxed-primitive argument, we @@ -68,126 +77,98 @@ follows: \end{verbatim} \begin{code} -dsCCall :: FAST_STRING -- C routine to invoke +dsCCall :: FAST_STRING -- C routine to invoke -> [CoreExpr] -- Arguments (desugared) - -> Bool -- True <=> might cause Haskell GC - -> Bool -- True <=> really a "_casm_" - -> Type -- Type of the result (a boxed-prim type) + -> Bool -- True <=> might cause Haskell GC + -> Bool -- True <=> really a "_casm_" + -> Type -- Type of the result (a boxed-prim IO type) -> DsM CoreExpr dsCCall label args may_gc is_asm result_ty - = newSysLocalDs realWorldStateTy `thenDs` \ old_s -> - - mapAndUnzipDs unboxArg (Var old_s : args) `thenDs` \ (final_args, arg_wrappers) -> + = newSysLocalDs realWorldStatePrimTy `thenDs` \ old_s -> - boxResult result_ty `thenDs` \ (final_result_ty, res_wrapper) -> + mapAndUnzipDs unboxArg args `thenDs` \ (unboxed_args, arg_wrappers) -> + boxResult 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 - [] -- ***NOTE*** no ty apps; the types are inside the_ccall_op. - final_args `thenDs` \ the_prim_app -> - let - the_body = foldr apply (res_wrapper the_prim_app) arg_wrappers + val_args = Var old_s : unboxed_args + final_args = Type inst_ty : val_args + + -- A CCallOp has type (forall a. a), so we must instantiate + -- it at the full type, including the state argument + inst_ty = mkFunTys (map coreExprType val_args) final_result_ty + + the_ccall_op = CCallOp (Left label) is_asm may_gc cCallConv + the_prim_app = mkPrimApp the_ccall_op final_args + + the_body = foldr ($) (res_wrapper the_prim_app) arg_wrappers in - returnDs (Lam (ValBinder old_s) the_body) - where - apply f x = f x + returnDs (Lam old_s the_body) \end{code} \begin{code} unboxArg :: CoreExpr -- The supplied argument - -> DsM (CoreExpr, -- To pass as the actual argument + -> DsM (CoreExpr, -- To pass as the actual argument CoreExpr -> CoreExpr -- Wrapper to unbox the arg ) unboxArg arg -- Primitive types -- ADR Question: can this ever be used? None of the PrimTypes are - -- instances of the _CCallable class. - | isPrimType arg_ty + -- instances of the CCallable class. + -- + -- SOF response: + -- Oh yes they are, I've just added them :-) Having _ccall_ and _casm_ + -- that accept unboxed arguments is a Good Thing if you have a stub generator + -- which generates the boiler-plate box-unbox code for you, i.e., it may help + -- us nuke this very module :-) + -- + | isUnLiftedType arg_ty = returnDs (arg, \body -> body) -- Strings - | arg_ty `eqTy` stringTy + | arg_ty == stringTy -- ToDo (ADR): - allow synonyms of Strings too? = newSysLocalDs byteArrayPrimTy `thenDs` \ prim_arg -> - mkAppDs (Var packStringForCId) [] [arg] `thenDs` \ pack_appn -> returnDs (Var prim_arg, - \body -> Case pack_appn (PrimAlts [] - (BindDefault prim_arg body)) - ) + \body -> Case (App (Var packStringForCId) arg) + prim_arg [(DEFAULT,[],body)]) | null data_cons -- oops: we can't see the data constructors!!! - = can't_see_datacons_error "argument" arg_ty + = can'tSeeDataConsPanic "argument" arg_ty - -- Byte-arrays, both mutable and otherwise - -- (HACKy method -- but we really don't want the TyCons wired-in...) [WDP 94/10] + -- Byte-arrays, both mutable and otherwise; hack warning | is_data_type && length data_con_arg_tys == 2 && - not (isPrimType data_con_arg_ty1) && - isPrimType data_con_arg_ty2 - -- and, of course, it is an instance of _CCallable --- ( tycon == byteArrayTyCon || --- tycon == mutableByteArrayTyCon ) - = newSysLocalsDs data_con_arg_tys `thenDs` \ vars@[ixs_var, arr_cts_var] -> + maybeToBool maybe_arg2_tycon && + (arg2_tycon == byteArrayPrimTyCon || + arg2_tycon == mutableByteArrayPrimTyCon) + -- and, of course, it is an instance of CCallable + = newSysLocalDs arg_ty `thenDs` \ case_bndr -> + newSysLocalsDs data_con_arg_tys `thenDs` \ vars@[ixs_var, arr_cts_var] -> returnDs (Var arr_cts_var, - \ body -> Case arg (AlgAlts [(the_data_con,vars,body)] - NoDefault) + \ body -> Case arg case_bndr [(DataCon the_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 -> - returnDs (Var prim_arg, - \ body -> Case arg (AlgAlts [(box_data_con,[prim_arg],body)] - NoDefault) - ) - -- ... continued below .... -\end{code} - -As an experiment, I'm going to unpack any "acceptably small" -enumeration. This code will never get used in the main version -because enumerations would have triggered type errors but I've -disabled type-checking in my version. ADR - -To Will: It might be worth leaving this in (but commented out) until -we decide what's happening with enumerations. ADR - -\begin{code} -#if 0 - -- MAYBE LATER: - -- Data types with a nullary constructors (enumeration) - | isEnumerationType arg_ty && -- enumeration - (length data_cons) <= 5 -- "acceptably short" - = newSysLocalDs the_prim_arg_ty `thenDs` \ prim_arg -> - - let - alts = [ (con, [], mkMachInt i) | (con,i) <- data_cons `zip` [0..] ] - arg_tag = Case arg (AlgAlts alts) NoDefault - in - + = newSysLocalDs arg_ty `thenDs` \ case_bndr -> + newSysLocalDs the_prim_arg_ty `thenDs` \ prim_arg -> returnDs (Var prim_arg, - \ body -> Case arg_tag (PrimAlts [(prim_arg, body)] NoDefault) + \ body -> Case arg case_bndr [(DataCon box_data_con,[prim_arg],body)] ) -#endif -\end{code} -\begin{code} - -- ... continued from above .... | otherwise - = pprPanic "unboxArg: " (ppr PprDebug arg_ty) + = getSrcLocDs `thenDs` \ l -> + pprPanic "unboxArg: " (ppr l <+> ppr arg_ty) where arg_ty = coreExprType 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 = maybeAppDataTyCon 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 @@ -195,106 +176,119 @@ we decide what's happening with enumerations. ADR data_con_arg_tys = dataConArgTys the_data_con tycon_arg_tys (data_con_arg_ty1 : data_con_arg_ty2 : _) = data_con_arg_tys -can't_see_datacons_error thing ty - = pprError "ERROR: Can't see the data constructor(s) for _ccall_/_casm_ " - (ppBesides [ppStr thing, ppStr "; type: ", ppr PprForUser ty]) + maybe_arg2_tycon = splitTyConApp_maybe data_con_arg_ty2 + Just (arg2_tycon,_) = maybe_arg2_tycon + +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} -tuple_con_2 = mkTupleCon 2 -- out here to avoid CAF (sigh) -covar_tuple_con_0 = Var (mkTupleCon 0) -- ditto - -boxResult :: 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 + -- to box the result boxResult result_ty | null data_cons -- oops! can't see the data constructors - = can't_see_datacons_error "result" result_ty + = can'tSeeDataConsPanic "result" result_ty - -- Data types with a single constructor, which has a single, primitive-typed arg + -- Data types with a single nullary constructor | (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 - isPrimType the_prim_result_ty -- of primitive type + (null data_con_arg_tys) = - newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id -> - newSysLocalDs the_prim_result_ty `thenDs` \ prim_result_id -> - - mkConDs stateDataCon [realWorldTy] [Var prim_state_id] `thenDs` \ new_state -> - mkConDs the_data_con tycon_arg_tys [Var prim_result_id] `thenDs` \ the_result -> - - mkConDs tuple_con_2 - [result_ty, realWorldStateTy] - [the_result, new_state] `thenDs` \ the_pair -> + newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id -> +{- + 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, + Con (DataCon unitDataCon) []] + the_alt = (DataCon (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 + -- 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 - (null data_con_arg_tys) + 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 stateDataCon [realWorldTy] [Var prim_state_id] `thenDs` \ new_state -> - - mkConDs tuple_con_2 - [result_ty, realWorldStateTy] - [covar_tuple_con_0, new_state] `thenDs` \ the_pair -> + newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id -> + 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 the_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 = (DataCon 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] ) -#if 0 - -- MAYBE LATER??? - - -- Data types with several nullary constructors (Enumerated types) - | isEnumerationType result_ty && -- Enumeration - (length data_cons) <= 5 -- fairly short - = - newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id -> - newSysLocalDs intPrimTy `thenDs` \ prim_result_id -> + | 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 + ccall_res_type = mkUnboxedTupleTy 2 + [realWorldStatePrimTy, the_prim_result_ty] - mkConDs stateDataCon [realWorldTy] [Var prim_state_id] `thenDs` \ new_state -> + data_con_arg_tys = dataConArgTys the_data_con tycon_arg_tys + (the_prim_result_ty : other_args_tys) = data_con_arg_tys +-- wrap up an unboxed value. +wrapUnboxedValue :: Type -> DsM (Type, Id, CoreExpr) +wrapUnboxedValue ty + | null data_cons + -- oops! can't see the data constructors + = can'tSeeDataConsPanic "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 + isUnLiftedType the_prim_result_ty -- of primitive type + = + newSysLocalDs the_prim_result_ty `thenDs` \ prim_result_id -> let - alts = [ (mkMachInt i, con) | (i, con) <- [0..] `zip` data_cons ] - the_result = Case prim_result_id (PrimAlts alts) NoDefault + the_result = mkConApp the_data_con (map Type tycon_arg_tys ++ [Var prim_result_id]) in + returnDs (ccall_res_type, prim_result_id, the_result) - mkConDs (mkTupleCon 2) - [result_ty, realWorldStateTy] - [the_result, new_state] `thenDs` \ the_pair -> - let - the_alt = (state_and_prim_datacon, [prim_state_id, prim_result_id], the_pair) + -- 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) + = + let unit = dataConId unitDataCon + scrut_ty = mkUnboxedTupleTy 1 [realWorldStatePrimTy] in - returnDs (state_and_prim_ty, - \prim_app -> Case prim_app (AlgAlts [the_alt] NoDefault) - ) -#endif - + returnDs (scrut_ty, unit, mkConApp unitDataCon []) | otherwise - = pprPanic "boxResult: " (ppr PprDebug result_ty) - - where - maybe_data_type = maybeAppDataTyCon result_ty - Just (tycon, tycon_arg_tys, data_cons) = maybe_data_type - (the_data_con : other_data_cons) = data_cons + = pprPanic "boxResult: " (ppr ty) + where + maybe_data_type = splitAlgTyConApp_maybe ty + Just (tycon, tycon_arg_tys, data_cons) = maybe_data_type + (the_data_con : other_data_cons) = data_cons + ccall_res_type = mkUnboxedTupleTy 2 + [realWorldStatePrimTy, the_prim_result_ty] - data_con_arg_tys = dataConArgTys the_data_con tycon_arg_tys - (the_prim_result_ty : other_args_tys) = data_con_arg_tys + data_con_arg_tys = dataConArgTys the_data_con tycon_arg_tys + (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} -