%
-% (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}
\begin{code}
module WwLib (
- WwBinding(..),
-
- worthSplitting, setUnpackStrategy,
- mkWwBodies, mkWrapper
+ mkWwBodies,
+ worthSplitting, setUnpackStrategy
) where
#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,
- splitForAllTys, splitFunTys,
- splitAlgTyConApp_maybe,
+import CoreUtils ( coreExprType )
+import Id ( Id, idType, mkSysLocal, getIdDemandInfo, setIdDemandInfo,
+ mkWildId, setIdInfo
+ )
+import IdInfo ( CprInfo(..), noCprInfo, vanillaIdInfo )
+import Const ( Con(..), DataCon )
+import DataCon ( isExistentialDataCon, dataConArgTys )
+import Demand ( Demand(..) )
+import PrelInfo ( realWorldPrimId, aBSENT_ERROR_ID )
+import TysPrim ( realWorldStatePrimTy )
+import TysWiredIn ( unboxedTupleCon, unboxedTupleTyCon )
+import Type ( isUnLiftedType,
+ splitForAllTys, splitFunTys,
+ splitAlgTyConApp_maybe, splitNewType_maybe,
+ mkTyConApp, mkFunTys,
Type
)
-import TyCon ( isNewTyCon, isDataTyCon )
-import BasicTypes ( NewOrData(..) )
-import TyVar ( TyVar )
-import UniqSupply ( returnUs, thenUs, getUniques, getUnique, UniqSM )
-import Util ( zipEqual, zipWithEqual )
+import TyCon ( isNewTyCon, isProductTyCon, TyCon )
+import BasicTypes ( NewOrData(..), Arity )
+import Var ( TyVar, IdOrTyVar )
+import UniqSupply ( returnUs, thenUs, getUniqueUs, getUniquesUs,
+ mapUs, UniqSM )
+import Util ( zipWithEqual, zipEqual )
import Outputable
\end{code}
-%************************************************************************
-%* *
-\subsection[datatype-WwLib]{@WwBinding@: a datatype for worker/wrapper-ing}
-%* *
-%************************************************************************
-
-In the worker/wrapper stuff, we want to carry around @CoreBindings@ in
-an ``intermediate form'' that can later be turned into a \tr{let} or
-\tr{case} (depending on strictness info).
-
-\begin{code}
-data WwBinding
- = WwLet [CoreBinding]
- | WwCase (CoreExpr -> CoreExpr)
- -- the "case" will be a "strict let" of the form:
- --
- -- case rhs of
- -- <blah> -> body
- --
- -- (instead of "let <blah> = rhs in body")
- --
- -- The expr you pass to the function is "body" (the
- -- expression that goes "in the corner").
-\end{code}
%************************************************************************
%* *
nonAbsentArgs (WwLazy True : ds) = nonAbsentArgs ds
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 :: [Demand]
+ -> Bool -- Result is bottom
+ -> Bool -- True <=> the wrapper would not be an identity function
+worthSplitting ds result_bot = any worth_it ds
+ -- We used not to split if the result is bottom.
+ -- [Justification: there's no efficiency to be gained,
+ -- and (worse) the wrapper body may not look like a wrapper
+ -- body to getWorkerIdAndCons]
+ -- But now (a) we don't have getWorkerIdAndCons, and
+ -- (b) it's sometimes bad not to make a wrapper. Consider
+ -- fw = \x# -> let x = I# x# in case e of
+ -- p1 -> error_fn x
+ -- p2 -> error_fn x
+ -- p3 -> the real stuff
+ -- The re-boxing code won't go away unless error_fn gets a wrapper too.
+
+ where
+ worth_it (WwLazy True) = True -- Absent arg
+ worth_it (WwUnpack _ True _) = True -- Arg to unpack
+ worth_it WwStrict = False -- Don't w/w just because of strictness
+ 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}
%* *
%************************************************************************
-@mkWrapper@ is called when importing a function. We have the type of
-the function and the name of its worker, and we want to make its body (the wrapper).
+@mkWwBodies@ is called when doing the worker/wrapper split inside a module.
\begin{code}
-mkWrapper :: Type -- Wrapper type
- -> [Demand] -- Wrapper strictness info
- -> UniqSM (Id -> CoreExpr) -- Wrapper body, missing worker Id
+mkWwBodies :: Type -- Type of original function
+ -> Arity -- Arity of original function
+ -> [Demand] -- Strictness of original function
+ -> CprInfo -- Result of CPR analysis
+ -> UniqSM ([IdOrTyVar], -- Worker args
+ Id -> CoreExpr, -- Wrapper body, lacking only the worker Id
+ CoreExpr -> CoreExpr) -- Worker body, lacking the original function rhs
+
+mkWwBodies fun_ty arity demands cpr_info
+ = WARN( arity /= length demands, text "mkWrapper" <+> ppr fun_ty <+> ppr arity <+> ppr demands )
+ mkWWargs fun_ty arity demands `thenUs` \ (wrap_args, wrap_fn_args, work_fn_args, res_ty) ->
+ mkWWstr wrap_args `thenUs` \ (work_args, wrap_fn_str, work_fn_str) ->
+ mkWWcpr res_ty cpr_info `thenUs` \ (wrap_fn_cpr, work_fn_cpr, cpr_res_ty) ->
+ mkWWfixup cpr_res_ty work_args `thenUs` \ (wrap_fn_fixup, work_fn_fixup) ->
+
+ returnUs (work_args,
+ Note InlineMe . wrap_fn_args . wrap_fn_cpr . wrap_fn_str . wrap_fn_fixup . Var,
+ work_fn_fixup . work_fn_str . work_fn_cpr . work_fn_args)
+\end{code}
-mkWrapper fun_ty demands
- = let
- n_wrap_args = length demands
- in
- getUniques n_wrap_args `thenUs` \ wrap_uniqs ->
+
+%************************************************************************
+%* *
+\subsection{Coercion stuff}
+%* *
+%************************************************************************
+
+
+We really want to "look through" coerces.
+Reason: I've seen this situation:
+
+ let f = coerce T (\s -> E)
+ in \x -> case x of
+ p -> coerce T' f
+ q -> \s -> E2
+ r -> coerce T' f
+
+If only we w/w'd f, we'd get
+ let f = coerce T (\s -> fw s)
+ fw = \s -> E
+ in ...
+
+Now we'll inline f to get
+
+ let fw = \s -> E
+ in \x -> case x of
+ p -> fw
+ q -> \s -> E2
+ r -> fw
+
+Now we'll see that fw has arity 1, and will arity expand
+the \x to get what we want.
+
+\begin{code}
+-- mkWWargs is driven off the function type.
+-- It chomps bites off foralls, arrows, newtypes
+-- and keeps repeating that until it's satisfied the supplied arity
+
+mkWWargs :: Type -> Int -> [Demand]
+ -> UniqSM ([IdOrTyVar], -- Wrapper args
+ CoreExpr -> CoreExpr, -- Wrapper fn
+ CoreExpr -> CoreExpr, -- Worker fn
+ Type) -- Type of wrapper body
+
+mkWWargs fun_ty arity demands
+ | arity == 0
+ = returnUs ([], id, id, fun_ty)
+
+ | otherwise
+ = getUniquesUs n_args `thenUs` \ wrap_uniqs ->
let
- (tyvars, tau_ty) = splitForAllTys fun_ty
- (arg_tys, body_ty) = splitFunTys tau_ty
- -- The "expanding dicts" part here is important, even for the splitForAll
- -- The imported thing might be a dictionary, such as Functor Foo
- -- But Functor Foo = forall a b. (a->b) -> Foo a -> Foo b
- -- and as such might have some strictness info attached.
- -- Then we need to have enough args to zip to the strictness info
-
- wrap_args = ASSERT( n_wrap_args <= length arg_tys )
- zipWith mk_ww_local wrap_uniqs arg_tys
-
- leftover_arg_tys = drop n_wrap_args arg_tys
- final_body_ty = mkFunTys leftover_arg_tys body_ty
+ val_args = zipWith3 mk_wrap_arg wrap_uniqs arg_tys demands
+ wrap_args = tyvars ++ val_args
in
- mkWwBodies tyvars wrap_args final_body_ty demands `thenUs` \ (wrap_fn, _, _) ->
- returnUs wrap_fn
+ mkWWargs body_rep_ty
+ (arity - n_args)
+ (drop n_args demands) `thenUs` \ (more_wrap_args, wrap_fn_args, work_fn_args, res_ty) ->
+
+ returnUs (wrap_args ++ more_wrap_args,
+ mkLams wrap_args . wrap_coerce_fn . wrap_fn_args,
+ work_fn_args . work_coerce_fn . applyToVars wrap_args,
+ res_ty)
+ where
+ (tyvars, tau) = splitForAllTys fun_ty
+ (arg_tys, body_ty) = splitFunTys tau
+ n_arg_tys = length arg_tys
+ n_args = arity `min` n_arg_tys
+ (wrap_coerce_fn, work_coerce_fn, body_rep_ty)
+ | n_arg_tys == n_args -- All arg_tys used up
+ = case splitNewType_maybe body_ty of
+ Just rep_ty -> (Note (Coerce body_ty rep_ty), Note (Coerce rep_ty body_ty), rep_ty)
+ Nothing -> ASSERT2( n_args /= 0, text "mkWWargs" <+> ppr arity <+> ppr fun_ty )
+ (id, id, body_ty)
+ | otherwise -- Leftover arg-tys
+ = (id, id, mkFunTys (drop n_args arg_tys) body_ty)
+
+applyToVars :: [IdOrTyVar] -> CoreExpr -> CoreExpr
+applyToVars vars fn = mkVarApps fn vars
+
+mk_wrap_arg uniq ty dmd = setIdDemandInfo (mkSysLocal SLIT("w") uniq ty) dmd
\end{code}
-@mkWwBodies@ is called when doing the worker/wrapper split inside a module.
+
+%************************************************************************
+%* *
+\subsection{Fixup stuff}
+%* *
+%************************************************************************
\begin{code}
-mkWwBodies :: [TyVar] -> [Id] -> Type -- Original fn args and body type
- -> [Demand] -- Strictness info for original fn; corresp 1-1 with args
- -> UniqSM (Id -> CoreExpr, -- Wrapper body, lacking only the worker Id
- CoreExpr -> CoreExpr, -- Worker body, lacking the original function body
- [Demand]) -- Strictness info for worker
-
-mkWwBodies tyvars args body_ty demands
- | allAbsent demands &&
- isUnpointedType body_ty
- = -- Horrid special case. If the worker would have no arguments, and the
+mkWWfixup res_ty work_args
+ | null work_args && isUnLiftedType res_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 ->
+ -- We use the state-token type which generates no code
+ = getUniqueUs `thenUs` \ void_arg_uniq ->
let
- void_arg = mk_ww_local void_arg_uniq voidTy
+ void_arg = mk_ww_local void_arg_uniq realWorldStatePrimTy
in
- returnUs (\ work_id -> mkLam tyvars args (App (mkTyApp (Var work_id) (mkTyVarTys tyvars)) (VarArg voidId)),
- \ body -> mkLam tyvars [void_arg] body,
- [WwLazy True])
+ returnUs (\ call_to_worker -> App call_to_worker (Var realWorldPrimId),
+ \ worker_body -> Lam void_arg worker_body)
-mkWwBodies tyvars 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
- 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)
-\end{code}
+ = returnUs (id, id)
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Strictness stuff}
+%* *
+%************************************************************************
\begin{code}
-mkWW :: [(Id,Demand)]
- -> UniqSM (CoreExpr -> CoreExpr, -- Wrapper body, lacking the inner call to the worker
- -- and without its lambdas
- [(Id,Demand)], -- Worker args and their demand infos
- CoreExpr -> CoreExpr) -- Worker body, lacking the original body of the function
+mkWWstr :: [IdOrTyVar] -- Wrapper args; have their demand info on them
+ -- *Includes type variables*
+ -> UniqSM ([IdOrTyVar], -- Worker args
+ CoreExpr -> CoreExpr, -- Wrapper body, lacking the worker call
+ -- and without its lambdas
+ -- This fn adds the unboxing, and makes the
+ -- call passing the unboxed things
+
+ CoreExpr -> CoreExpr) -- Worker body, lacking the original body of the function,
+ -- but *with* lambdas
+mkWWstr wrap_args
+ = mk_ww_str wrap_args `thenUs` \ (work_args, wrap_fn, work_fn) ->
+ returnUs ( work_args,
+ \ wrapper_body -> wrap_fn (mkVarApps wrapper_body work_args),
+ \ worker_body -> mkLams work_args (work_fn worker_body))
-- Empty case
-mkWW []
- = returnUs (\ wrapper_body -> wrapper_body,
- [],
+mk_ww_str []
+ = returnUs ([],
+ \ wrapper_body -> wrapper_body,
\ worker_body -> worker_body)
- -- 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))
+mk_ww_str (arg : ds)
+ | isTyVar arg
+ = mk_ww_str ds `thenUs` \ (worker_args, wrap_fn, work_fn) ->
+ returnUs (arg : worker_args, wrap_fn, work_fn)
+
+ | otherwise
+ = case getIdDemandInfo arg of
+ -- Absent case
+ WwLazy True ->
+ mk_ww_str ds `thenUs` \ (worker_args, wrap_fn, work_fn) ->
+ returnUs (worker_args, wrap_fn, mk_absent_let arg . work_fn)
-- 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
+ 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 "mk_ww_str" setIdDemandInfo unpk_args cs
+ in
+ mk_ww_str (unpk_args_w_ds ++ ds) `thenUs` \ (worker_args, wrap_fn, work_fn) ->
+ returnUs (worker_args,
+ mk_unpk_case new_or_data arg unpk_args data_con arg_tycon . wrap_fn,
+ work_fn . mk_pk_let new_or_data arg data_con tycon_arg_tys unpk_args)
+ where
+ (arg_tycon, tycon_arg_tys, data_con, inst_con_arg_tys) = splitProductType "mk_ww_str" (idType arg)
+
+ -- Other cases
+ other_demand ->
+ mk_ww_str ds `thenUs` \ (worker_args, wrap_fn, work_fn) ->
+ returnUs (arg : worker_args, wrap_fn, work_fn)
+\end{code}
+
- Just (arg_tycon, tycon_arg_tys, [data_con]) ->
- -- The main event: a single-constructor data type
- (arg_tycon, tycon_arg_tys, data_con)
+%************************************************************************
+%* *
+\subsection{CPR stuff}
+%* *
+%************************************************************************
- 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"
+@mkWWcpr@ takes the worker/wrapper pair produced from the strictness
+info and adds in the CPR transformation. The worker returns an
+unboxed tuple containing non-CPR components. The wrapper takes this
+tuple and re-produces the correct structured output.
- -- 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)
+The non-CPR results appear ordered in the unboxed tuple as if by a
+left-to-right traversal of the result structure.
+
+
+\begin{code}
+mkWWcpr :: Type -- function body type
+ -> CprInfo -- CPR analysis results
+ -> UniqSM (CoreExpr -> CoreExpr, -- New wrapper
+ CoreExpr -> CoreExpr, -- New worker
+ Type) -- Type of worker's body
+
+mkWWcpr body_ty NoCPRInfo
+ = returnUs (id, id, body_ty) -- Must be just the strictness transf.
+
+mkWWcpr body_ty (CPRInfo cpr_args)
+ | n_con_args == 1 && isUnLiftedType con_arg_ty1
+ -- Special case when there is a single result of unlifted type
+ = getUniquesUs 2 `thenUs` \ [work_uniq, arg_uniq] ->
+ let
+ work_wild = mk_ww_local work_uniq body_ty
+ arg = mk_ww_local arg_uniq con_arg_ty1
+ in
+ returnUs (\ wkr_call -> mkConApp data_con (map Type tycon_arg_tys ++ [wkr_call]),
+ \ body -> Case body work_wild [(DataCon data_con, [arg], Var arg)],
+ con_arg_ty1)
+
+ | otherwise -- The general case
+ = getUniquesUs (n_con_args + 2) `thenUs` \ uniqs ->
+ let
+ (wrap_wild : work_wild : args) = zipWith mk_ww_local uniqs (ubx_tup_ty : body_ty : con_arg_tys)
+ arg_vars = map Var args
+ ubx_tup_con = unboxedTupleCon n_con_args
+ ubx_tup_ty = coreExprType 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)
+ in
+ returnUs (\ wkr_call -> Case wkr_call wrap_wild [(DataCon ubx_tup_con, args, con_app)],
+ \ body -> Case body work_wild [(DataCon data_con, args, ubx_tup_app)],
+ ubx_tup_ty)
+ where
+ (tycon, tycon_arg_tys, data_con, con_arg_tys) = splitProductType "mkWWcpr" body_ty
+ n_con_args = length con_arg_tys
+ con_arg_ty1 = head con_arg_tys
+
+
+splitProductType :: String -> Type -> (TyCon, [Type], DataCon, [Type])
+ -- For a tiresome reason, the type might not look like a product type
+ -- This happens when compiling the compiler! The module Name
+ -- imports {-# SOURCE #-} TyCon and Id
+ -- data Name = Name NameSort Unique OccName Provenance
+ -- data NameSort = WiredInId Module Id | ...
+ -- So Name does not look recursive (because Id is imported via a hi-boot file,
+ -- which says nothing about Id's rep) but actually it is, because Ids have Names.
+ -- Modules that *import* Name have a more complete view, see that Name is recursive,
+ -- and therefore that it isn't a ProductType. This conflicts with the CPR info
+ -- in exports from Name that say "do CPR".
+ --
+ -- Arguably we should regard Name as a product anyway because it isn't recursive
+ -- via products all the way... but we don't have that info to hand, and even if
+ -- we did this case might *still* arise.
+
+ --
+ -- So we hack our way out for now, by trusting the pragma that said "do CPR"
+ -- that means we can't use splitProductType_maybe
+
+splitProductType fname ty
+ = case splitAlgTyConApp_maybe ty of
+ Just (tycon, tycon_args, (con:other_cons))
+ | null other_cons && not (isExistentialDataCon con)
+ -> WARN( not (isProductTyCon tycon),
+ text "splitProductType hack: I happened!" <+> ppr ty )
+ (tycon, tycon_args, con, dataConArgTys con tycon_args)
+
+ Nothing -> pprPanic (fname ++ ": not a product") (ppr ty)
\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))
+ (sanitiseCaseBndr 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)
+ (sanitiseCaseBndr arg)
+ [(DataCon boxing_con, unpk_args, body)]
+
+sanitiseCaseBndr :: Id -> Id
+-- The argument we are scrutinising has the right type to be
+-- a case binder, so it's convenient to re-use it for that purpose.
+-- But we *must* throw away all its IdInfo. In particular, the argument
+-- will have demand info on it, and that demand info may be incorrect for
+-- the case binder. e.g. case ww_arg of ww_arg { I# x -> ... }
+-- Quite likely ww_arg isn't used in '...'. The case may get discarded
+-- if the case binder says "I'm demanded". This happened in a situation
+-- like (x+y) `seq` ....
+sanitiseCaseBndr id = id `setIdInfo` vanillaIdInfo
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
-mk_ww_local uniq ty
- = mkSysLocal SLIT("ww") uniq ty noSrcLoc
\end{code}
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