%
-% (c) The GRASP/AQUA Project, Glasgow University, 1993-1995
+% (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
%
\section[SimplStg]{Driver for simplifying @STG@ programs}
import StgSyn
-import LambdaLift ( liftProgram )
-import Name ( isLocallyDefined )
-import UniqSet ( UniqSet(..), mapUniqSet )
-import CostCentre ( CostCentre )
+import CostCentre ( CollectedCCs )
import SCCfinal ( stgMassageForProfiling )
import StgLint ( lintStgBindings )
import StgStats ( showStgStats )
-import StgVarInfo ( setStgVarInfo )
-import UpdAnal ( updateAnalyse )
+import SRT ( computeSRTs )
-import CmdLineOpts ( opt_SccGroup, --Not used:opt_EnsureSplittableC,
- opt_StgDoLetNoEscapes, opt_D_verbose_stg2stg,
- opt_DoStgLinting,
- StgToDo(..)
+import CmdLineOpts ( DynFlags, DynFlag(..), dopt,
+ StgToDo(..), dopt_StgToDo
)
-import Id ( nullIdEnv, lookupIdEnv, addOneToIdEnv,
- growIdEnvList, isNullIdEnv, IdEnv,
- GenId{-instance Eq/Outputable -}, Id
- )
-import Maybes ( maybeToBool )
-import PprType ( GenType{-instance Outputable-} )
-import ErrUtils ( doIfSet )
-import UniqSupply ( splitUniqSupply, UniqSupply )
-import Util ( mapAccumL, panic, assertPanic )
-import IO ( hPutStr, stderr )
+import Id ( Id )
+import Module ( Module )
+import ErrUtils ( doIfSet_dyn, dumpIfSet_dyn, showPass )
+import UniqSupply ( mkSplitUniqSupply, splitUniqSupply )
import Outputable
-import GlaExts ( trace )
\end{code}
\begin{code}
-stg2stg :: [StgToDo] -- spec of what stg-to-stg passes to do
- -> FAST_STRING -- module name (profiling only)
- -> UniqSupply -- a name supply
- -> [StgBinding] -- input...
- -> IO
- ([StgBinding], -- output program...
- ([CostCentre], -- local cost-centres that need to be decl'd
- [CostCentre])) -- "extern" cost-centres
-
-stg2stg stg_todos module_name us binds
- = case (splitUniqSupply us) of { (us4now, us4later) ->
-
- doIfSet do_verbose_stg2stg
- (printErrs (text "VERBOSE STG-TO-STG:" $$
- text "*** Core2Stg:" $$
- vcat (map ppr (setStgVarInfo False binds)))) >>
-
- -- Do the main business!
- foldl_mn do_stg_pass (binds, us4now, ([],[])) stg_todos
- >>= \ (processed_binds, _, cost_centres) ->
-
- -- Do essential wind-up
-
-{- Nuked for now SLPJ Dec 96
-
- -- Essential wind-up: part (a), saturate RHSs
- -- This must occur *after* elimIndirections, because elimIndirections
- -- can change things' arities. Consider:
- -- x_local = f x
- -- x_global = \a -> x_local a
- -- Then elimIndirections will change the program to
- -- x_global = f x
- -- and lo and behold x_global's arity has changed!
- case (satStgRhs processed_binds us4later) of { saturated_binds ->
--}
-
- -- Essential wind-up: part (b), do setStgVarInfo. It has to
- -- happen regardless, because the code generator uses its
- -- decorations.
- --
- -- Why does it have to happen last? Because earlier passes
- -- may move things around, which would change the live-var
- -- info. Also, setStgVarInfo decides about let-no-escape
- -- things, which in turn do a better job if arities are
- -- correct, which is done by satStgRhs.
- --
-
- return (setStgVarInfo do_let_no_escapes processed_binds, cost_centres)
+stg2stg :: DynFlags -- includes spec of what stg-to-stg passes to do
+ -> Module -- module name (profiling only)
+ -> [StgBinding] -- input...
+ -> IO ( [(StgBinding,[(Id,[Id])])] -- output program...
+ , CollectedCCs) -- cost centre information (declared and used)
+
+stg2stg dflags module_name binds
+ = do { showPass dflags "Stg2Stg"
+ ; us <- mkSplitUniqSupply 'g'
+
+ ; doIfSet_dyn dflags Opt_D_verbose_stg2stg
+ (printDump (text "VERBOSE STG-TO-STG:"))
+
+ ; (binds', us', ccs) <- end_pass us "Stg2Stg" ([],[],[]) binds
+
+ -- Do the main business!
+ ; (processed_binds, _, cost_centres)
+ <- foldl_mn do_stg_pass (binds', us', ccs)
+ (dopt_StgToDo dflags)
+
+ ; let srt_binds = computeSRTs processed_binds
+
+ ; dumpIfSet_dyn dflags Opt_D_dump_stg "STG syntax:"
+ (pprStgBindingsWithSRTs srt_binds)
+
+ ; return (srt_binds, cost_centres)
}
+
where
- do_let_no_escapes = opt_StgDoLetNoEscapes
- do_verbose_stg2stg = opt_D_verbose_stg2stg
-
-{-
- (do_unlocalising, unlocal_tag)
- = case opt_EnsureSplittableC of
- Just tag -> (True, _PK_ tag)
- Nothing -> (False, panic "tag")
--}
- grp_name = case (opt_SccGroup) of
- Just xx -> _PK_ xx
- Nothing -> module_name -- default: module name
-
- -------------
- stg_linter = if False --LATER: opt_DoStgLinting (ToDo)
+ stg_linter = if dopt Opt_DoStgLinting dflags
then lintStgBindings
else ( \ whodunnit binds -> binds )
(us1, us2) = splitUniqSupply us
in
case to_do of
- StgDoStaticArgs -> panic "STG static argument transformation deleted"
-
- StgDoUpdateAnalysis ->
- ASSERT(null (fst ccs) && null (snd ccs))
- _scc_ "StgUpdAnal"
- -- NB We have to do setStgVarInfo first! (There's one
- -- place free-var info is used) But no let-no-escapes,
- -- because update analysis doesn't care.
- end_pass us2 "UpdAnal" ccs (updateAnalyse (setStgVarInfo False binds))
-
D_stg_stats ->
trace (showStgStats binds)
end_pass us2 "StgStats" ccs binds
- StgDoLambdaLift ->
- _scc_ "StgLambdaLift"
- -- NB We have to do setStgVarInfo first!
- let
- binds3 = liftProgram module_name us1 (setStgVarInfo do_let_no_escapes binds)
- in
- end_pass us2 "LambdaLift" ccs binds3
-
StgDoMassageForProfiling ->
_scc_ "ProfMassage"
let
(collected_CCs, binds3)
- = stgMassageForProfiling module_name grp_name us1 binds
+ = stgMassageForProfiling module_name us1 binds
in
end_pass us2 "ProfMassage" collected_CCs binds3
end_pass us2 what ccs binds2
- = -- report verbosely, if required
- (if do_verbose_stg2stg then
- hPutStr stderr (showSDoc
- (text ("*** "++what++":") $$ vcat (map ppr binds2)
- ))
- else return ()) >>
- let
- linted_binds = stg_linter what binds2
- in
- return (linted_binds, us2, ccs)
+ = do -- report verbosely, if required
+ dumpIfSet_dyn dflags Opt_D_verbose_stg2stg what
+ (vcat (map ppr binds2))
+ let linted_binds = stg_linter what binds2
+ return (linted_binds, us2, ccs)
-- return: processed binds
-- UniqueSupply for the next guy to use
-- cost-centres to be declared/registered (specialised)
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