%
-% (c) The GRASP/AQUA Project, Glasgow University, 1993-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
%
\section[WwLib]{A library for the ``worker/wrapper'' back-end to the strictness analyser}
#include "HsVersions.h"
import CoreSyn
-import MkId ( mkSysLocal )
-import Id ( idType, dataConArgTys, isDataCon, isNewCon, Id )
-import IdInfo ( Demand(..) )
-import PrelVals ( aBSENT_ERROR_ID, voidId )
-import TysPrim ( voidTy )
-import SrcLoc ( noSrcLoc )
-import Type ( isUnpointedType, mkTyVarTys, mkFunTys,
+import Id ( Id, idType, mkSysLocal, getIdDemandInfo, setIdDemandInfo )
+import Const ( Con(..) )
+import DataCon ( dataConArgTys )
+import Demand ( Demand(..) )
+import PrelVals ( aBSENT_ERROR_ID )
+import TysWiredIn ( unitTy, unitDataCon )
+import Type ( isUnLiftedType, mkTyVarTys, mkTyVarTy, mkFunTys,
splitForAllTys, splitFunTys,
splitAlgTyConApp_maybe,
Type
)
-import TyCon ( isNewTyCon, isDataTyCon )
import BasicTypes ( NewOrData(..) )
-import TyVar ( TyVar )
-import UniqSupply ( returnUs, thenUs, getUniques, getUnique, UniqSM )
-import Util ( zipEqual, zipWithEqual )
+import Var ( TyVar )
+import UniqSupply ( returnUs, thenUs, getUniqueUs, getUniquesUs, UniqSM )
+import Util ( zipWithEqual )
import Outputable
\end{code}
\begin{code}
data WwBinding
- = WwLet [CoreBinding]
+ = WwLet [CoreBind]
| WwCase (CoreExpr -> CoreExpr)
-- the "case" will be a "strict let" of the form:
--
nonAbsentArgs (d : ds) = 1 + nonAbsentArgs ds
worthSplitting :: [Demand] -> Bool -- True <=> the wrapper would not be an identity function
-worthSplitting [] = False
-worthSplitting (WwLazy True : ds) = True -- Absent arg
-worthSplitting (WwUnpack _ True _ : ds) = True -- Arg to unpack
-worthSplitting (d : ds) = worthSplitting ds
+worthSplitting ds = any worth_it ds
+ where
+ worth_it (WwLazy True) = True -- Absent arg
+ worth_it (WwUnpack _ True _) = True -- Arg to unpack
+ worth_it WwStrict = True
+ worth_it other = False
allAbsent :: [Demand] -> Bool
-allAbsent (WwLazy True : ds) = allAbsent ds
-allAbsent (WwUnpack _ True cs : ds) = allAbsent cs && allAbsent ds
-allAbsent (d : ds) = False
-allAbsent [] = True
+allAbsent ds = all absent ds
+ where
+ absent (WwLazy is_absent) = is_absent
+ absent (WwUnpack _ True cs) = allAbsent cs
+ absent other = False
\end{code}
= let
n_wrap_args = length demands
in
- getUniques n_wrap_args `thenUs` \ wrap_uniqs ->
+ getUniquesUs n_wrap_args `thenUs` \ wrap_uniqs ->
let
(tyvars, tau_ty) = splitForAllTys fun_ty
(arg_tys, body_ty) = splitFunTys tau_ty
mkWwBodies tyvars args body_ty demands
| allAbsent demands &&
- isUnpointedType body_ty
+ isUnLiftedType body_ty
= -- Horrid special case. If the worker would have no arguments, and the
-- function returns a primitive type value, that would make the worker into
-- an unboxed value. We box it by passing a dummy void argument, thus:
-- f = /\abc. \xyz. fw abc void
-- fw = /\abc. \v. body
--
- getUnique `thenUs` \ void_arg_uniq ->
+ getUniqueUs `thenUs` \ void_arg_uniq ->
let
- void_arg = mk_ww_local void_arg_uniq voidTy
+ void_arg = mk_ww_local void_arg_uniq unitTy
in
- returnUs (\ work_id -> mkLam tyvars args (App (mkTyApp (Var work_id) (mkTyVarTys tyvars)) (VarArg voidId)),
- \ body -> mkLam tyvars [void_arg] body,
+ returnUs (\ work_id -> mkLams tyvars $ mkLams args $
+ mkApps (Var work_id)
+ (map (Type . mkTyVarTy) tyvars ++ [mkConApp unitDataCon []]),
+ \ body -> mkLams (tyvars ++ [void_arg]) body,
[WwLazy True])
-mkWwBodies tyvars args body_ty demands
+mkWwBodies tyvars wrap_args body_ty demands
| otherwise
= let
- args_w_demands = zipEqual "mkWwBodies" args demands
- in
- mkWW args_w_demands `thenUs` \ (wrap_fn, work_args_w_demands, work_fn) ->
- let
- (work_args, work_demands) = unzip work_args_w_demands
+ wrap_args_w_demands = zipWithEqual "mkWwBodies" setIdDemandInfo wrap_args demands
in
- returnUs (\ work_id -> mkLam tyvars args (wrap_fn (mkTyApp (Var work_id) (mkTyVarTys tyvars))),
- \ body -> mkLam tyvars work_args (work_fn body),
- work_demands)
+ mkWW wrap_args_w_demands `thenUs` \ (wrap_fn, work_args_w_demands, work_fn) ->
+ returnUs (\ work_id -> mkLams tyvars $ mkLams wrap_args_w_demands $
+ wrap_fn (mkTyApps (Var work_id) (mkTyVarTys tyvars)),
+
+ \ body -> mkLams tyvars $ mkLams work_args_w_demands $
+ work_fn body,
+
+ map getIdDemandInfo work_args_w_demands)
\end{code}
\begin{code}
-mkWW :: [(Id,Demand)]
+mkWW :: [Id] -- Wrapper args; have their demand info on them
-> UniqSM (CoreExpr -> CoreExpr, -- Wrapper body, lacking the inner call to the worker
-- and without its lambdas
- [(Id,Demand)], -- Worker args and their demand infos
+ [Id], -- Worker args; have their demand info on them
CoreExpr -> CoreExpr) -- Worker body, lacking the original body of the function
\ worker_body -> worker_body)
+mkWW (arg : ds)
+ = case getIdDemandInfo arg of
+
-- Absent case
-mkWW ((arg,WwLazy True) : ds)
- = mkWW ds `thenUs` \ (wrap_fn, worker_args, work_fn) ->
- returnUs (\ wrapper_body -> wrap_fn wrapper_body,
- worker_args,
- \ worker_body -> mk_absent_let arg (work_fn worker_body))
+ WwLazy True ->
+ mkWW ds `thenUs` \ (wrap_fn, worker_args, work_fn) ->
+ returnUs (\ wrapper_body -> wrap_fn wrapper_body,
+ worker_args,
+ \ worker_body -> mk_absent_let arg (work_fn worker_body))
-- Unpack case
-mkWW ((arg,WwUnpack new_or_data True cs) : ds)
- = getUniques (length inst_con_arg_tys) `thenUs` \ uniqs ->
- let
- unpk_args = zipWith mk_ww_local uniqs inst_con_arg_tys
- unpk_args_w_ds = zipEqual "mkWW" unpk_args cs
- in
- mkWW (unpk_args_w_ds ++ ds) `thenUs` \ (wrap_fn, worker_args, work_fn) ->
- returnUs (\ wrapper_body -> mk_unpk_case new_or_data arg unpk_args data_con arg_tycon
- (wrap_fn wrapper_body),
- worker_args,
- \ worker_body -> work_fn (mk_pk_let new_or_data arg data_con
- tycon_arg_tys unpk_args worker_body))
- where
- inst_con_arg_tys = dataConArgTys data_con tycon_arg_tys
- (arg_tycon, tycon_arg_tys, data_con)
- = case (splitAlgTyConApp_maybe (idType arg)) of
-
- Just (arg_tycon, tycon_arg_tys, [data_con]) ->
- -- The main event: a single-constructor data type
- (arg_tycon, tycon_arg_tys, data_con)
-
- Just (_, _, data_cons) -> pprPanic "mk_ww_arg_processing: not one constr (interface files not consistent/up to date ?)" ((ppr arg) <+> (ppr (idType arg)))
- Nothing -> panic "mk_ww_arg_processing: not datatype"
+ WwUnpack new_or_data True cs ->
+ getUniquesUs (length inst_con_arg_tys) `thenUs` \ uniqs ->
+ let
+ unpk_args = zipWith mk_ww_local uniqs inst_con_arg_tys
+ unpk_args_w_ds = zipWithEqual "mkWW" setIdDemandInfo unpk_args cs
+ in
+ mkWW (unpk_args_w_ds ++ ds) `thenUs` \ (wrap_fn, worker_args, work_fn) ->
+ returnUs (\ wrapper_body -> mk_unpk_case new_or_data arg unpk_args data_con arg_tycon
+ (wrap_fn wrapper_body),
+ worker_args,
+ \ worker_body -> work_fn (mk_pk_let new_or_data arg data_con
+ tycon_arg_tys unpk_args worker_body))
+ where
+ inst_con_arg_tys = dataConArgTys data_con tycon_arg_tys
+ (arg_tycon, tycon_arg_tys, data_con)
+ = case (splitAlgTyConApp_maybe (idType arg)) of
+
+ Just (arg_tycon, tycon_arg_tys, [data_con]) ->
+ -- The main event: a single-constructor data type
+ (arg_tycon, tycon_arg_tys, data_con)
+
+ Just (_, _, data_cons) ->
+ pprPanic "mk_ww_arg_processing:"
+ (text "not one constr (interface files not consistent/up to date?)"
+ $$ (ppr arg <+> ppr (idType arg)))
+
+ Nothing ->
+ panic "mk_ww_arg_processing: not datatype"
-- Other cases
-mkWW ((arg,other_demand) : ds)
- = mkWW ds `thenUs` \ (wrap_fn, worker_args, work_fn) ->
- returnUs (\ wrapper_body -> wrap_fn (App wrapper_body (VarArg arg)),
- (arg,other_demand) : worker_args,
- work_fn)
+ other_demand ->
+ mkWW ds `thenUs` \ (wrap_fn, worker_args, work_fn) ->
+ returnUs (\ wrapper_body -> wrap_fn (App wrapper_body (Var arg)),
+ arg : worker_args,
+ work_fn)
\end{code}
\begin{code}
mk_absent_let arg body
- | not (isUnpointedType arg_ty)
- = Let (NonRec arg (mkTyApp (Var aBSENT_ERROR_ID) [arg_ty])) body
+ | not (isUnLiftedType arg_ty)
+ = Let (NonRec arg (mkTyApps (Var aBSENT_ERROR_ID) [arg_ty])) body
| otherwise
= panic "WwLib: haven't done mk_absent_let for primitives yet"
where
mk_unpk_case NewType arg unpk_args boxing_con boxing_tycon body
-- A newtype! Use a coercion not a case
- = ASSERT( null other_args && isNewTyCon boxing_tycon )
- Let (NonRec unpk_arg (Note (Coerce (idType unpk_arg) (idType arg)) (Var arg)))
- body
+ = ASSERT( null other_args )
+ Case (Note (Coerce (idType unpk_arg) (idType arg)) (Var arg))
+ unpk_arg
+ [(DEFAULT,[],body)]
where
(unpk_arg:other_args) = unpk_args
mk_unpk_case DataType arg unpk_args boxing_con boxing_tycon body
-- A data type
- = ASSERT( isDataTyCon boxing_tycon )
- Case (Var arg)
- (AlgAlts [(boxing_con, unpk_args, body)]
- NoDefault
- )
+ = Case (Var arg) arg [(DataCon boxing_con, unpk_args, body)]
mk_pk_let NewType arg boxing_con con_tys unpk_args body
- = ASSERT( null other_args && isNewCon boxing_con )
+ = ASSERT( null other_args )
Let (NonRec arg (Note (Coerce (idType arg) (idType unpk_arg)) (Var unpk_arg))) body
where
(unpk_arg:other_args) = unpk_args
mk_pk_let DataType arg boxing_con con_tys unpk_args body
- = ASSERT( isDataCon boxing_con )
- Let (NonRec arg (Con boxing_con con_args)) body
+ = Let (NonRec arg (Con (DataCon boxing_con) con_args)) body
where
- con_args = map TyArg con_tys ++ map VarArg unpk_args
+ con_args = map Type con_tys ++ map Var unpk_args
-mk_ww_local uniq ty
- = mkSysLocal SLIT("ww") uniq ty noSrcLoc
+mk_ww_local uniq ty = mkSysLocal uniq ty
\end{code}
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