\section[WwLib]{A library for the ``worker/wrapper'' back-end to the strictness analyser}
\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 WwLib ( mkWwBodies, mkWWstr, mkWorkerArgs ) where
#include "HsVersions.h"
setIdInfo
)
import IdInfo ( vanillaIdInfo )
-import DataCon ( splitProductType_maybe, splitProductType )
+import DataCon ( deepSplitProductType_maybe, deepSplitProductType )
import NewDemand ( Demand(..), DmdResult(..), Demands(..) )
-import MkId ( realWorldPrimId, voidArgId, mkRuntimeErrorApp, rUNTIME_ERROR_ID )
+import MkId ( realWorldPrimId, voidArgId, mkRuntimeErrorApp, rUNTIME_ERROR_ID,
+ mkUnpackCase, mkProductBox )
import TysWiredIn ( tupleCon )
import Type ( Type, isUnLiftedType, mkFunTys,
- splitForAllTys, splitFunTys, splitRecNewType_maybe, isAlgType
+ splitForAllTys, splitFunTys, isAlgType
)
+import Coercion ( mkSymCoercion, splitNewTypeRepCo_maybe )
import BasicTypes ( Boxity(..) )
import Var ( Var, isId )
import UniqSupply ( returnUs, thenUs, getUniquesUs, UniqSM )
mkWWcpr res_ty res_info
else
returnUs (id, id, res_ty)
- ) `thenUs` \ (wrap_fn_cpr, work_fn_cpr, cpr_res_ty) ->
+ ) `thenUs` \ (wrap_fn_cpr, work_fn_cpr, _cpr_res_ty) ->
- returnUs ([idNewDemandInfo v | v <- work_args, isId v],
+ returnUs ([idNewDemandInfo v | v <- work_call_args, isId v],
Note InlineMe . wrap_fn_args . wrap_fn_cpr . wrap_fn_str . applyToVars work_call_args . Var,
mkLams work_lam_args. work_fn_str . work_fn_cpr . work_fn_args)
-- We use an INLINE unconditionally, even if the wrapper turns out to be
Type) -- Type of wrapper body
mkWWargs fun_ty demands one_shots
- | Just rep_ty <- splitRecNewType_maybe fun_ty
+ | Just (rep_ty, co) <- splitNewTypeRepCo_maybe fun_ty
-- The newtype case is for when the function has
-- a recursive newtype after the arrow (rare)
-- We check for arity >= 0 to avoid looping in the case
-- simply coerces.
= mkWWargs rep_ty demands one_shots `thenUs` \ (wrap_args, wrap_fn_args, work_fn_args, res_ty) ->
returnUs (wrap_args,
- Note (Coerce fun_ty rep_ty) . wrap_fn_args,
- work_fn_args . Note (Coerce rep_ty fun_ty),
+ \ e -> Cast (wrap_fn_args e) (mkSymCoercion co),
+ \ e -> work_fn_args (Cast e co),
res_ty)
-
| notNull demands
= getUniquesUs `thenUs` \ wrap_uniqs ->
let
-- Unpack case
Eval (Prod cs)
- | Just (arg_tycon, tycon_arg_tys, data_con, inst_con_arg_tys)
- <- splitProductType_maybe (idType arg)
+ | Just (_arg_tycon, _tycon_arg_tys, data_con, inst_con_arg_tys)
+ <- deepSplitProductType_maybe (idType arg)
-> getUniquesUs `thenUs` \ uniqs ->
let
unpk_args = zipWith mk_ww_local uniqs inst_con_arg_tys
unpk_args_w_ds = zipWithEqual "mkWWstr" set_worker_arg_info unpk_args cs
- unbox_fn = mk_unpk_case arg unpk_args data_con arg_tycon
+ unbox_fn = mkUnpackCase (sanitiseCaseBndr arg) (Var arg) unpk_args data_con
rebox_fn = Let (NonRec arg con_app)
- con_app = mkConApp data_con (map Type tycon_arg_tys ++ map Var unpk_args)
+ con_app = mkProductBox unpk_args (idType arg)
in
mkWWstr unpk_args_w_ds `thenUs` \ (worker_args, wrap_fn, work_fn) ->
- returnUs (worker_args, unbox_fn . wrap_fn, work_fn . rebox_fn)
+ returnUs (worker_args, unbox_fn . wrap_fn, work_fn . rebox_fn)
-- Don't pass the arg, rebox instead
-- `seq` demand; evaluate in wrapper in the hope
let
work_wild = mk_ww_local work_uniq body_ty
arg = mk_ww_local arg_uniq con_arg_ty1
- con_app = mkConApp data_con (map Type tycon_arg_tys ++ [Var arg])
+ con_app = mkProductBox [arg] body_ty
in
- returnUs (\ wkr_call -> Case wkr_call arg (exprType con_app) [(DEFAULT, [], con_app)],
- \ body -> workerCase body work_wild con_arg_ty1 [(DataAlt data_con, [arg], Var arg)],
+ returnUs (\ wkr_call -> Case wkr_call (arg) (exprType con_app) [(DEFAULT, [], con_app)],
+ \ body -> workerCase (work_wild) body [arg] data_con (Var arg),
con_arg_ty1)
| otherwise -- The general case
ubx_tup_con = tupleCon Unboxed n_con_args
ubx_tup_ty = exprType ubx_tup_app
ubx_tup_app = mkConApp ubx_tup_con (map Type con_arg_tys ++ arg_vars)
- con_app = mkConApp data_con (map Type tycon_arg_tys ++ arg_vars)
+ con_app = mkProductBox args body_ty
in
- returnUs (\ wkr_call -> Case wkr_call wrap_wild (exprType con_app) [(DataAlt ubx_tup_con, args, con_app)],
- \ body -> workerCase body work_wild ubx_tup_ty [(DataAlt data_con, args, ubx_tup_app)],
+ returnUs (\ wkr_call -> Case wkr_call (wrap_wild) (exprType con_app) [(DataAlt ubx_tup_con, args, con_app)],
+ \ body -> workerCase (work_wild) body args data_con ubx_tup_app,
ubx_tup_ty)
where
- (_, tycon_arg_tys, data_con, con_arg_tys) = splitProductType "mkWWcpr" body_ty
+ (_arg_tycon, _tycon_arg_tys, data_con, con_arg_tys) = deepSplitProductType "mkWWcpr" body_ty
n_con_args = length con_arg_tys
con_arg_ty1 = head con_arg_tys
-- This transform doesn't move work or allocation
-- from one cost centre to another
-workerCase (Note (SCC cc) e) arg ty alts = Note (SCC cc) (Case e arg ty alts)
-workerCase e arg ty alts = Case e arg ty alts
+workerCase bndr (Note (SCC cc) e) args con body = Note (SCC cc) (mkUnpackCase bndr e args con body)
+workerCase bndr e args con body = mkUnpackCase bndr e args con body
\end{code}
abs_rhs = mkRuntimeErrorApp rUNTIME_ERROR_ID arg_ty msg
msg = "Oops! Entered absent arg " ++ showSDocDebug (ppr arg <+> ppr (idType arg))
-mk_unpk_case arg unpk_args boxing_con boxing_tycon body
- -- A data type
- = Case (Var arg)
- (sanitiseCaseBndr arg)
- (exprType body)
- [(DataAlt boxing_con, unpk_args, body)]
-
mk_seq_case arg body = Case (Var arg) (sanitiseCaseBndr arg) (exprType body) [(DEFAULT, [], body)]
sanitiseCaseBndr :: Id -> Id
projects / ghc-hetmet.git / blobdiff