%
-% (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}
\begin{code}
-#include "HsVersions.h"
-
module SimplStg ( stg2stg ) where
-IMP_Ubiq(){-uitous-}
-IMPORT_1_3(IO(hPutStr,stderr))
+#include "HsVersions.h"
import StgSyn
-import LambdaLift ( liftProgram )
-import Name ( isLocallyDefined )
+import CostCentre ( CostCentre, CostCentreStack )
import SCCfinal ( stgMassageForProfiling )
import StgLint ( lintStgBindings )
import StgStats ( showStgStats )
-import StgVarInfo ( setStgVarInfo )
-import UpdAnal ( updateAnalyse )
+import SRT ( computeSRTs )
-import CmdLineOpts ( opt_EnsureSplittableC, opt_SccGroup,
- opt_StgDoLetNoEscapes, opt_D_verbose_stg2stg,
- StgToDo(..)
+import CmdLineOpts ( DynFlags, DynFlag(..), dopt,
+ StgToDo(..), dopt_StgToDo
)
-import Id ( nullIdEnv, lookupIdEnv, addOneToIdEnv,
- growIdEnvList, isNullIdEnv, SYN_IE(IdEnv),
- GenId{-instance Eq/Outputable -}
- )
-import Maybes ( maybeToBool )
-import PprType ( GenType{-instance Outputable-} )
-import Pretty ( ppShow, ppAbove, ppAboves, ppStr )
-import UniqSupply ( splitUniqSupply )
-import Util ( mapAccumL, panic, assertPanic )
-
+import Id ( Id )
+import Module ( Module )
+import ErrUtils ( doIfSet_dyn, dumpIfSet_dyn, showPass )
+import UniqSupply ( mkSplitUniqSupply, splitUniqSupply )
+import Outputable
\end{code}
\begin{code}
-stg2stg :: [StgToDo] -- spec of what stg-to-stg passes to do
- -> FAST_STRING -- module name (profiling only)
- -> PprStyle -- printing style (for debugging only)
- -> UniqSupply -- a name supply
+stg2stg :: DynFlags -- includes spec of what stg-to-stg passes to do
+ -> Module -- module name (profiling only)
-> [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 ppr_style us binds
- = case (splitUniqSupply us) of { (us4now, us4later) ->
-
- (if do_verbose_stg2stg then
- hPutStr stderr "VERBOSE STG-TO-STG:\n" >>
- hPutStr stderr (ppShow 1000
- (ppAbove (ppStr ("*** Core2Stg:"))
- (ppAboves (map (ppr ppr_style) (setStgVarInfo False binds)))
- ))
- else return ()) >>
-
- -- 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.
- --
-
-{- Done in Core now. Nuke soon. SLPJ Nov 96
- let
- -- ToDo: provide proper flag control!
- binds_to_mangle
- = if not do_unlocalising
- then saturated_binds
- else snd (unlocaliseStgBinds unlocal_tag nullIdEnv no_ind_binds)
- in
--}
-
- return (setStgVarInfo do_let_no_escapes processed_binds, cost_centres)
- }
- where
- do_let_no_escapes = opt_StgDoLetNoEscapes
- do_verbose_stg2stg = opt_D_verbose_stg2stg
+ ([(StgBinding,[Id])], -- output program...
+ ([CostCentre], -- local cost-centres that need to be decl'd
+ [CostCentre], -- "extern" cost-centres
+ [CostCentreStack])) -- pre-defined "singleton" cost centre stacks
+
+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
- grp_name = case (opt_SccGroup) of
- Just xx -> _PK_ xx
- Nothing -> module_name -- default: module name
+ ; dumpIfSet_dyn dflags Opt_D_dump_stg "STG syntax:"
+ (pprStgBindingsWithSRTs srt_binds)
- -------------
- stg_linter = if False -- LATER: switch_is_on DoCoreLinting -- ToDo: DoStgLinting flag
- then lintStgBindings ppr_style
+ ; return (srt_binds, cost_centres)
+ }
+
+ where
+ 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 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 (ppShow 1000
- (ppAbove (ppStr ("*** "++what++":"))
- (ppAboves (map (ppr ppr_style) 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)
foldl_mn f z (x:xs) = f z x >>= \ zz ->
foldl_mn f zz xs
\end{code}
-
-
projects / ghc-hetmet.git / blobdiff