%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[SCCfinal]{Modify and collect code generation for final STG program}
* "Distributes" given cost-centres to all as-yet-unmarked RHSs.
\begin{code}
-#include "HsVersions.h"
-
module SCCfinal ( stgMassageForProfiling ) where
-IMP_Ubiq(){-uitous-}
+#include "HsVersions.h"
import StgSyn
-import CmdLineOpts ( opt_AutoSccsOnIndividualCafs,
- opt_CompilingPrelude
- )
+import CmdLineOpts ( opt_AutoSccsOnIndividualCafs )
import CostCentre -- lots of things
-import Id ( idType, mkSysLocal, emptyIdSet )
-import Maybes ( maybeToBool )
-import SrcLoc ( mkUnknownSrcLoc )
-import Type ( splitSigmaTy, getFunTy_maybe )
-import UniqSupply ( getUnique, splitUniqSupply )
-import Util ( removeDups, assertPanic )
+import Id ( Id )
+import Module ( Module )
+import UniqSupply ( uniqFromSupply, splitUniqSupply, UniqSupply )
+import Unique ( Unique )
+import VarSet
+import ListSetOps ( removeDups )
+import Outputable
infixr 9 `thenMM`, `thenMM_`
\end{code}
\begin{code}
-type CollectedCCs = ([CostCentre], -- locally defined ones
- [CostCentre]) -- ones needing "extern" decls
-
stgMassageForProfiling
- :: FAST_STRING -> FAST_STRING -- module name, group name
+ :: Module -- module name
-> UniqSupply -- unique supply
-> [StgBinding] -- input
-> (CollectedCCs, [StgBinding])
-stgMassageForProfiling mod_name grp_name us stg_binds
+stgMassageForProfiling mod_name us stg_binds
= let
- ((local_ccs, extern_ccs),
+ ((local_ccs, extern_ccs, cc_stacks),
stg_binds2)
- = initMM mod_name us (mapMM do_top_binding stg_binds)
+ = initMM mod_name us (do_top_bindings stg_binds)
- fixed_ccs
- = if do_auto_sccs_on_cafs || doing_prelude
- then [] -- don't need "all CAFs" CC (for Prelude, we use PreludeCC)
- else [all_cafs_cc]
+ (fixed_ccs, fixed_cc_stacks)
+ = if opt_AutoSccsOnIndividualCafs
+ then ([],[]) -- don't need "all CAFs" CC
+ -- (for Prelude, we use PreludeCC)
+ else ([all_cafs_cc], [all_cafs_ccs])
local_ccs_no_dups = fst (removeDups cmpCostCentre local_ccs)
extern_ccs_no_dups = fst (removeDups cmpCostCentre extern_ccs)
in
- ((fixed_ccs ++ local_ccs_no_dups, extern_ccs_no_dups), stg_binds2)
+ ((fixed_ccs ++ local_ccs_no_dups,
+ extern_ccs_no_dups,
+ fixed_cc_stacks ++ cc_stacks), stg_binds2)
where
- do_auto_sccs_on_cafs = opt_AutoSccsOnIndividualCafs -- only use!
- doing_prelude = opt_CompilingPrelude
- all_cafs_cc = if doing_prelude
- then preludeCafsCostCentre
- else mkAllCafsCC mod_name grp_name
+ all_cafs_cc = mkAllCafsCC mod_name
+ all_cafs_ccs = mkSingletonCCS all_cafs_cc
----------
- do_top_binding :: StgBinding -> MassageM StgBinding
+ do_top_bindings :: [StgBinding] -> MassageM [StgBinding]
- do_top_binding (StgNonRec b rhs)
- = do_top_rhs b rhs `thenMM` \ rhs' ->
- returnMM (StgNonRec b rhs')
+ do_top_bindings [] = returnMM []
- do_top_binding (StgRec pairs)
- = mapMM do_pair pairs `thenMM` \ pairs2 ->
- returnMM (StgRec pairs2)
+ do_top_bindings (StgNonRec b rhs : bs)
+ = do_top_rhs b rhs `thenMM` \ rhs' ->
+ addTopLevelIshId b (
+ do_top_bindings bs `thenMM` \bs' ->
+ returnMM (StgNonRec b rhs' : bs')
+ )
+
+ do_top_bindings (StgRec pairs : bs)
+ = addTopLevelIshIds binders (
+ mapMM do_pair pairs `thenMM` \ pairs2 ->
+ do_top_bindings bs `thenMM` \ bs' ->
+ returnMM (StgRec pairs2 : bs')
+ )
where
- do_pair (b, rhs)
+ binders = map fst pairs
+ do_pair (b, rhs)
= do_top_rhs b rhs `thenMM` \ rhs2 ->
returnMM (b, rhs2)
----------
do_top_rhs :: Id -> StgRhs -> MassageM StgRhs
- do_top_rhs binder (StgRhsClosure rhs_cc bi fv u [] (StgSCC ty cc (StgCon con args lvs)))
- -- top-level _scc_ around nothing but static data; toss it -- it's pointless
- = returnMM (StgRhsCon dontCareCostCentre con args)
-
- do_top_rhs binder (StgRhsClosure rhs_cc bi fv u [] (StgSCC ty cc expr))
- -- Top level CAF with explicit scc expression. Attach CAF
- -- cost centre to StgRhsClosure and collect.
- = let
- calved_cc = cafifyCC cc
- in
- collectCC calved_cc `thenMM_`
- set_prevailing_cc calved_cc (
- do_expr expr
- ) `thenMM` \ expr' ->
- returnMM (StgRhsClosure calved_cc bi fv u [] expr')
-
- do_top_rhs binder (StgRhsClosure cc bi fv u [] body)
- | noCostCentreAttached cc || currentOrSubsumedCosts cc
- -- Top level CAF without a cost centre attached: Collect
- -- cost centre with binder name, if collecting CAFs.
- = let
- (did_something, cc2)
- = if do_auto_sccs_on_cafs then
- (True, mkAutoCC binder mod_name grp_name IsCafCC)
- else
- (False, all_cafs_cc)
- in
- (if did_something
- then collectCC cc2
- else nopMM) `thenMM_`
- set_prevailing_cc cc2 (
- do_expr body
- ) `thenMM` \body2 ->
- returnMM (StgRhsClosure cc2 bi fv u [] body2)
-
- do_top_rhs binder (StgRhsClosure _ bi fv u args body@(StgSCC ty cc expr))
- -- We blindly use the cc off the _scc_
- = set_prevailing_cc cc (
- do_expr body
- ) `thenMM` \ body2 ->
- returnMM (StgRhsClosure cc bi fv u args body2)
-
- do_top_rhs binder (StgRhsClosure cc bi fv u args body)
- = let
- cc2 = if noCostCentreAttached cc
- then subsumedCosts -- it's not a thunk; it is top-level & arity > 0
- else cc
- in
- set_prevailing_cc cc2 (
- do_expr body
- ) `thenMM` \ body' ->
- returnMM (StgRhsClosure cc2 bi fv u args body')
+ do_top_rhs binder (StgRhsClosure _ bi fv u srt [] (StgSCC cc (StgConApp con args)))
+ | not (isSccCountCostCentre cc) && not (isDllConApp con args)
+ -- Trivial _scc_ around nothing but static data
+ -- Eliminate _scc_ ... and turn into StgRhsCon
+
+ -- isDllConApp checks for LitLit args too
+ = returnMM (StgRhsCon dontCareCCS con args)
+
+{- Can't do this one with cost-centre stacks: --SDM
+ do_top_rhs binder (StgRhsClosure no_cc bi fv u [] (StgSCC ty cc expr))
+ | (noCCSAttached no_cc || currentOrSubsumedCCS no_cc)
+ && not (isSccCountCostCentre cc)
+ -- Top level CAF without a cost centre attached
+ -- Attach and collect cc of trivial _scc_ in body
+ = collectCC cc `thenMM_`
+ set_prevailing_cc cc (do_expr expr) `thenMM` \ expr' ->
+ returnMM (StgRhsClosure cc bi fv u [] expr')
+-}
- do_top_rhs binder (StgRhsCon cc con args)
- = returnMM (StgRhsCon dontCareCostCentre con args)
+ do_top_rhs binder (StgRhsClosure no_cc bi fv u srt [] body)
+ | noCCSAttached no_cc || currentOrSubsumedCCS no_cc
+ -- Top level CAF without a cost centre attached
+ -- Attach CAF cc (collect if individual CAF ccs)
+ = (if opt_AutoSccsOnIndividualCafs
+ then let cc = mkAutoCC binder mod_name CafCC
+ ccs = mkSingletonCCS cc
+ in
+ collectCC cc `thenMM_`
+ collectCCS ccs `thenMM_`
+ returnMM ccs
+ else
+ returnMM all_cafs_ccs) `thenMM` \ caf_ccs ->
+ set_prevailing_cc caf_ccs (do_expr body) `thenMM` \ body' ->
+ returnMM (StgRhsClosure caf_ccs bi fv u srt [] body')
+
+ do_top_rhs binder (StgRhsClosure cc bi fv u srt [] body)
+ -- Top level CAF with cost centre attached
+ -- Should this be a CAF cc ??? Does this ever occur ???
+ = pprPanic "SCCfinal: CAF with cc:" (ppr cc)
+
+ do_top_rhs binder (StgRhsClosure no_ccs bi fv u srt args body)
+ -- Top level function, probably subsumed
+ | noCCSAttached no_ccs
+ = set_lambda_cc (do_expr body) `thenMM` \ body' ->
+ returnMM (StgRhsClosure subsumedCCS bi fv u srt args body')
+
+ | otherwise
+ = pprPanic "SCCfinal: CAF with cc:" (ppr no_ccs)
+
+ do_top_rhs binder (StgRhsCon ccs con args)
-- Top-level (static) data is not counted in heap
- -- profiles; nor do we set CCC from it; so we
+ -- profiles; nor do we set CCCS from it; so we
-- just slam in dontCareCostCentre
+ = returnMM (StgRhsCon dontCareCCS con args)
------
do_expr :: StgExpr -> MassageM StgExpr
- do_expr (StgApp fn args lvs)
- = boxHigherOrderArgs (StgApp fn) args lvs
+ do_expr (StgLit l) = returnMM (StgLit l)
- do_expr (StgCon con args lvs)
- = boxHigherOrderArgs (StgCon con) args lvs
+ do_expr (StgApp fn args)
+ = boxHigherOrderArgs (StgApp fn) args
- do_expr (StgPrim op args lvs)
- = boxHigherOrderArgs (StgPrim op) args lvs
+ do_expr (StgConApp con args)
+ = boxHigherOrderArgs (\args -> StgConApp con args) args
- do_expr (StgSCC ty cc expr) -- Ha, we found a cost centre!
+ do_expr (StgOpApp con args res_ty)
+ = boxHigherOrderArgs (\args -> StgOpApp con args res_ty) args
+
+ do_expr (StgSCC cc expr) -- Ha, we found a cost centre!
= collectCC cc `thenMM_`
- set_prevailing_cc cc (
- do_expr expr
- ) `thenMM` \ expr' ->
- returnMM (StgSCC ty cc expr')
+ do_expr expr `thenMM` \ expr' ->
+ returnMM (StgSCC cc expr')
- do_expr (StgCase expr fv1 fv2 uniq alts)
+ do_expr (StgCase expr fv1 fv2 bndr srt alt_type alts)
= do_expr expr `thenMM` \ expr' ->
- do_alts alts `thenMM` \ alts' ->
- returnMM (StgCase expr' fv1 fv2 uniq alts')
+ mapMM do_alt alts `thenMM` \ alts' ->
+ returnMM (StgCase expr' fv1 fv2 bndr srt alt_type alts')
where
- do_alts (StgAlgAlts ty alts def)
- = mapMM do_alt alts `thenMM` \ alts' ->
- do_deflt def `thenMM` \ def' ->
- returnMM (StgAlgAlts ty alts' def')
- where
- do_alt (id, bs, use_mask, e)
- = do_expr e `thenMM` \ e' ->
- returnMM (id, bs, use_mask, e')
-
- do_alts (StgPrimAlts ty alts def)
- = mapMM do_alt alts `thenMM` \ alts' ->
- do_deflt def `thenMM` \ def' ->
- returnMM (StgPrimAlts ty alts' def')
- where
- do_alt (l,e)
- = do_expr e `thenMM` \ e' ->
- returnMM (l,e')
-
- do_deflt StgNoDefault = returnMM StgNoDefault
- do_deflt (StgBindDefault b is_used e)
- = do_expr e `thenMM` \ e' ->
- returnMM (StgBindDefault b is_used e')
+ do_alt (id, bs, use_mask, e)
+ = do_expr e `thenMM` \ e' ->
+ returnMM (id, bs, use_mask, e')
do_expr (StgLet b e)
- = set_prevailing_cc_maybe useCurrentCostCentre (
- do_binding b `thenMM` \ b' ->
- do_expr e `thenMM` \ e' ->
- returnMM (StgLet b' e') )
-
- do_expr (StgLetNoEscape lvs1 lvs2 rhs body)
- = set_prevailing_cc_maybe useCurrentCostCentre (
- do_binding rhs `thenMM` \ rhs' ->
- do_expr body `thenMM` \ body' ->
- returnMM (StgLetNoEscape lvs1 lvs2 rhs' body') )
-
- ----------
- do_binding :: StgBinding -> MassageM StgBinding
-
- do_binding (StgNonRec b rhs)
- = do_rhs rhs `thenMM` \ rhs' ->
- returnMM (StgNonRec b rhs')
-
- do_binding (StgRec pairs)
- = mapMM do_pair pairs `thenMM` \ new_pairs ->
- returnMM (StgRec new_pairs)
+ = do_let b e `thenMM` \ (b,e) ->
+ returnMM (StgLet b e)
+
+ do_expr (StgLetNoEscape lvs1 lvs2 b e)
+ = do_let b e `thenMM` \ (b,e) ->
+ returnMM (StgLetNoEscape lvs1 lvs2 b e)
+
+#ifdef DEBUG
+ do_expr other = pprPanic "SCCfinal.do_expr" (ppr other)
+#endif
+
+ ----------------------------------
+
+ do_let (StgNonRec b rhs) e
+ = do_rhs rhs `thenMM` \ rhs' ->
+ addTopLevelIshId b (
+ do_expr e `thenMM` \ e' ->
+ returnMM (StgNonRec b rhs',e')
+ )
+
+ do_let (StgRec pairs) e
+ = addTopLevelIshIds binders (
+ mapMM do_pair pairs `thenMM` \ pairs' ->
+ do_expr e `thenMM` \ e' ->
+ returnMM (StgRec pairs', e')
+ )
where
- do_pair (b, rhs)
- = do_rhs rhs `thenMM` \ rhs' ->
- returnMM (b, rhs')
+ binders = map fst pairs
+ do_pair (b, rhs)
+ = do_rhs rhs `thenMM` \ rhs2 ->
+ returnMM (b, rhs2)
+ ----------------------------------
do_rhs :: StgRhs -> MassageM StgRhs
-- We play much the same game as we did in do_top_rhs above;
- -- but we don't have to worry about cafifying, etc.
- -- (ToDo: consolidate??)
+ -- but we don't have to worry about cafs etc.
-{- Patrick says NO: it will mess up our counts (WDP 95/07)
- do_rhs (StgRhsClosure _ bi fv u [] (StgSCC _ cc (StgCon con args lvs)))
+{-
+ do_rhs (StgRhsClosure closure_cc bi fv u [] (StgSCC ty cc (StgCon (DataCon con) args _)))
+ | not (isSccCountCostCentre cc)
= collectCC cc `thenMM_`
returnMM (StgRhsCon cc con args)
-}
- do_rhs (StgRhsClosure _ bi fv u args body@(StgSCC _ cc _))
- = set_prevailing_cc cc (
- do_expr body
- ) `thenMM` \ body' ->
- returnMM (StgRhsClosure cc bi fv u args body')
-
- do_rhs (StgRhsClosure cc bi fv u args body)
- = use_prevailing_cc_maybe cc `thenMM` \ cc2 ->
- set_prevailing_cc cc2 (
- do_expr body
- ) `thenMM` \ body' ->
- returnMM (StgRhsClosure cc2 bi fv u args body')
+ do_rhs (StgRhsClosure _ bi fv u srt args expr)
+ = slurpSCCs currentCCS expr `thenMM` \ (expr', ccs) ->
+ do_expr expr' `thenMM` \ expr'' ->
+ returnMM (StgRhsClosure ccs bi fv u srt args expr'')
+ where
+ slurpSCCs ccs (StgSCC cc e)
+ = collectCC cc `thenMM_`
+ slurpSCCs ccs e `thenMM` \ (e', ccs') ->
+ returnMM (e', pushCCOnCCS cc ccs')
+ slurpSCCs ccs e
+ = returnMM (e, ccs)
do_rhs (StgRhsCon cc con args)
- = use_prevailing_cc_maybe cc `thenMM` \ cc2 ->
- returnMM (StgRhsCon cc2 con args)
- -- ToDo: Box args (if lex) Pass back let binding???
- -- Nope: maybe later? WDP 94/06
+ = returnMM (StgRhsCon currentCCS con args)
\end{code}
%************************************************************************
%* *
%************************************************************************
+Boxing is *turned off* at the moment, until we can figure out how to
+do it properly in general.
+
\begin{code}
boxHigherOrderArgs
- :: ([StgArg] -> StgLiveVars -> StgExpr)
- -- An application lacking its arguments and live-var info
- -> [StgArg] -- arguments which we might box
- -> StgLiveVars -- live var info, which we do *not* try
- -- to maintain/update (setStgVarInfo will
- -- do that)
+ :: ([StgArg] -> StgExpr)
+ -- An application lacking its arguments
+ -> [StgArg] -- arguments which we might box
-> MassageM StgExpr
-boxHigherOrderArgs almost_expr args live_vars
- = mapAccumMM do_arg [] args `thenMM` \ (let_bindings, new_args) ->
- get_prevailing_cc `thenMM` \ cc ->
- returnMM (foldr (mk_stg_let cc) (almost_expr new_args live_vars) let_bindings)
+#ifndef PROF_DO_BOXING
+boxHigherOrderArgs almost_expr args
+ = returnMM (almost_expr args)
+#else
+boxHigherOrderArgs almost_expr args
+ = getTopLevelIshIds `thenMM` \ ids ->
+ mapAccumMM (do_arg ids) [] args `thenMM` \ (let_bindings, new_args) ->
+ returnMM (foldr (mk_stg_let currentCCS) (almost_expr new_args) let_bindings)
where
---------------
- do_arg bindings atom@(StgLitArg _) = returnMM (bindings, atom)
- do_arg bindings atom@(StgVarArg old_var)
- = let
- var_type = idType old_var
+ do_arg ids bindings arg@(StgVarArg old_var)
+ | (not (isLocalVar old_var) || elemVarSet old_var ids)
+ && isFunTy (dropForAlls var_type)
+ = -- make a trivial let-binding for the top-level function
+ getUniqueMM `thenMM` \ uniq ->
+ let
+ new_var = mkSysLocal FSLIT("sf") uniq var_type
in
- if not (is_fun_type var_type) then
- returnMM (bindings, atom) -- easy
- else
- -- make a trivial let-binding for the higher-order guy
- getUniqueMM `thenMM` \ uniq ->
- let
- new_var = mkSysLocal SLIT("ho") uniq var_type mkUnknownSrcLoc
- in
- returnMM ( (new_var, old_var) : bindings, StgVarArg new_var )
+ returnMM ( (new_var, old_var) : bindings, StgVarArg new_var )
where
- is_fun_type ty
- = case (splitSigmaTy ty) of { (_, _, tau_ty) ->
- maybeToBool (getFunTy_maybe tau_ty) }
+ var_type = idType old_var
+
+ do_arg ids bindings arg = returnMM (bindings, arg)
---------------
- mk_stg_let :: CostCentre -> (Id, Id) -> StgExpr -> StgExpr
+ mk_stg_let :: CostCentreStack -> (Id, Id) -> StgExpr -> StgExpr
mk_stg_let cc (new_var, old_var) body
= let
- rhs_body = StgApp (StgVarArg old_var) [{-no args-}] bOGUS_LVs
-
- rhs = StgRhsClosure cc
- stgArgOcc -- safe...
- [{-junk-}] Updatable [{-no args-}] rhs_body
- in
- StgLet (StgNonRec new_var rhs) body
+ rhs_body = StgApp old_var [{-args-}]
+ rhs_closure = StgRhsClosure cc stgArgOcc [{-fvs-}] ReEntrant NoSRT{-eeek!!!-} [{-args-}] rhs_body
+ in
+ StgLet (StgNonRec new_var rhs_closure) body
where
- bOGUS_LVs = emptyIdSet -- easier to print than: panic "mk_stg_let: LVs"
+ bOGUS_LVs = emptyUniqSet -- easier to print than: panic "mk_stg_let: LVs"
+#endif
\end{code}
%************************************************************************
\begin{code}
type MassageM result
- = FAST_STRING -- module name
- -> CostCentre -- prevailing CostCentre
+ = Module -- module name
+ -> CostCentreStack -- prevailing CostCentre
-- if none, subsumedCosts at top-level
- -- useCurrentCostCentre at nested levels
+ -- currentCostCentre at nested levels
-> UniqSupply
+ -> VarSet -- toplevel-ish Ids for boxing
-> CollectedCCs
-> (CollectedCCs, result)
--- the initUs function also returns the final UniqueSupply and CollectedCCs
+-- the initMM function also returns the final CollectedCCs
-initMM :: FAST_STRING -- module name, which we may consult
+initMM :: Module -- module name, which we may consult
-> UniqSupply
-> MassageM a
-> (CollectedCCs, a)
-initMM mod_name init_us m = m mod_name subsumedCosts{-top-level-} init_us ([],[])
+initMM mod_name init_us m = m mod_name noCCS init_us emptyVarSet ([],[],[])
thenMM :: MassageM a -> (a -> MassageM b) -> MassageM b
thenMM_ :: MassageM a -> (MassageM b) -> MassageM b
-thenMM expr cont mod scope_cc us ccs
+thenMM expr cont mod scope_cc us ids ccs
= case splitUniqSupply us of { (s1, s2) ->
- case (expr mod scope_cc s1 ccs) of { (ccs2, result) ->
- cont result mod scope_cc s2 ccs2 }}
+ case (expr mod scope_cc s1 ids ccs) of { (ccs2, result) ->
+ cont result mod scope_cc s2 ids ccs2 }}
-thenMM_ expr cont mod scope_cc us ccs
+thenMM_ expr cont mod scope_cc us ids ccs
= case splitUniqSupply us of { (s1, s2) ->
- case (expr mod scope_cc s1 ccs) of { (ccs2, _) ->
- cont mod scope_cc s2 ccs2 }}
+ case (expr mod scope_cc s1 ids ccs) of { (ccs2, _) ->
+ cont mod scope_cc s2 ids ccs2 }}
returnMM :: a -> MassageM a
-returnMM result mod scope_cc us ccs = (ccs, result)
+returnMM result mod scope_cc us ids ccs = (ccs, result)
nopMM :: MassageM ()
-nopMM mod scope_cc us ccs = (ccs, ())
+nopMM mod scope_cc us ids ccs = (ccs, ())
mapMM :: (a -> MassageM b) -> [a] -> MassageM [b]
-
mapMM f [] = returnMM []
mapMM f (m:ms)
= f m `thenMM` \ r ->
returnMM (r:rs)
mapAccumMM :: (acc -> x -> MassageM (acc, y)) -> acc -> [x] -> MassageM (acc, [y])
-
mapAccumMM f b [] = returnMM (b, [])
mapAccumMM f b (m:ms)
= f b m `thenMM` \ (b2, r) ->
returnMM (b3, r:rs)
getUniqueMM :: MassageM Unique
-getUniqueMM mod scope_cc us ccs = (ccs, getUnique us)
-\end{code}
+getUniqueMM mod scope_cc us ids ccs = (ccs, uniqFromSupply us)
-\begin{code}
-set_prevailing_cc, set_prevailing_cc_maybe
- :: CostCentre -> MassageM a -> MassageM a
+addTopLevelIshId :: Id -> MassageM a -> MassageM a
+addTopLevelIshId id scope mod scope_cc us ids ccs
+ | isCurrentCCS scope_cc = scope mod scope_cc us ids ccs
+ | otherwise = scope mod scope_cc us (extendVarSet ids id) ccs
-set_prevailing_cc cc_to_set_to action mod scope_cc us ccs
- = action mod cc_to_set_to us ccs
- -- set unconditionally
+addTopLevelIshIds :: [Id] -> MassageM a -> MassageM a
+addTopLevelIshIds [] cont = cont
+addTopLevelIshIds (id:ids) cont
+ = addTopLevelIshId id (addTopLevelIshIds ids cont)
-set_prevailing_cc_maybe cc_to_set_to action mod scope_cc us ccs
- = let
- -- used when switching from top-level to nested
- -- scope; if we were chugging along as "subsumed",
- -- we change to the new thing; otherwise we
- -- keep what we had.
-
- cc_to_use
- = if (costsAreSubsumed scope_cc)
- then cc_to_set_to
- else scope_cc -- carry on as before
- in
- action mod cc_to_use us ccs
+getTopLevelIshIds :: MassageM VarSet
+getTopLevelIshIds mod scope_cc us ids ccs = (ccs, ids)
+\end{code}
-get_prevailing_cc :: MassageM CostCentre
-get_prevailing_cc mod scope_cc us ccs = (ccs, scope_cc)
+The prevailing CCS is used to tell whether we're in a top-levelish
+position, where top-levelish is defined as "not inside a lambda".
+Prevailing CCs used to be used for something much more complicated,
+I'm sure --SDM
-use_prevailing_cc_maybe :: CostCentre -> MassageM CostCentre
+\begin{code}
+set_lambda_cc :: MassageM a -> MassageM a
+set_lambda_cc action mod scope_cc us ids ccs
+ = action mod currentCCS us ids ccs
-use_prevailing_cc_maybe cc_to_try mod scope_cc us ccs
- = let
- cc_to_use
- = if not (noCostCentreAttached cc_to_try
- || currentOrSubsumedCosts cc_to_try) then
- cc_to_try
- else
- uncalved_scope_cc
- -- carry on as before, but be sure it
- -- isn't marked as CAFish (we're
- -- crossing a lambda...)
- in
- (ccs, cc_to_use)
- where
- uncalved_scope_cc = unCafifyCC scope_cc
+set_prevailing_cc :: CostCentreStack -> MassageM a -> MassageM a
+set_prevailing_cc cc_to_set_to action mod scope_cc us ids ccs
+ = action mod cc_to_set_to us ids ccs
+
+get_prevailing_cc :: MassageM CostCentreStack
+get_prevailing_cc mod scope_cc us ids ccs = (ccs, scope_cc)
\end{code}
\begin{code}
collectCC :: CostCentre -> MassageM ()
-collectCC cc mod_name scope_cc us (local_ccs, extern_ccs)
- = ASSERT(not (noCostCentreAttached cc))
- ASSERT(not (currentOrSubsumedCosts cc))
+collectCC cc mod_name scope_cc us ids (local_ccs, extern_ccs, ccss)
+ = ASSERT(not (noCCAttached cc))
if (cc `ccFromThisModule` mod_name) then
- ((cc : local_ccs, extern_ccs), ())
+ ((cc : local_ccs, extern_ccs, ccss), ())
else -- must declare it "extern"
- ((local_ccs, cc : extern_ccs), ())
+ ((local_ccs, cc : extern_ccs, ccss), ())
+
+collectCCS :: CostCentreStack -> MassageM ()
+
+collectCCS ccs mod_name scope_cc us ids (local_ccs, extern_ccs, ccss)
+ = ASSERT(not (noCCSAttached ccs))
+ ((local_ccs, extern_ccs, ccs : ccss), ())
\end{code}
projects / ghc-hetmet.git / blobdiff