%
-% (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,
+import CmdLineOpts ( opt_SccGroup,
opt_StgDoLetNoEscapes, opt_D_verbose_stg2stg,
+ opt_DoStgLinting, opt_D_dump_stg,
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, moduleString )
+import VarEnv
+import ErrUtils ( doIfSet, dumpIfSet )
+import UniqSupply ( splitUniqSupply, UniqSupply )
+import IO ( hPutStr, stderr )
+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)
+ -> Module -- 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
+ ([(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 stg_todos module_name ppr_style us binds
+stg2stg stg_todos module_name 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 ()) >>
+ doIfSet opt_D_verbose_stg2stg (printErrs (text "VERBOSE STG-TO-STG:")) >>
+
+ end_pass us4now "Core2Stg" ([],[],[]) binds
+ >>= \ (binds', us, ccs) ->
-- Do the main business!
- foldl_mn do_stg_pass (binds, us4now, ([],[])) stg_todos
+ foldl_mn do_stg_pass (binds', us, ccs) 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.
-- 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)
+ annotated_binds = setStgVarInfo opt_StgDoLetNoEscapes processed_binds
+ srt_binds = computeSRTs annotated_binds
in
--}
- return (setStgVarInfo do_let_no_escapes processed_binds, cost_centres)
+ dumpIfSet 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
+ where
grp_name = case (opt_SccGroup) of
Just xx -> _PK_ xx
- Nothing -> module_name -- default: module name
+ Nothing -> _PK_ (moduleString module_name) -- default: module name
-------------
- stg_linter = if False -- LATER: switch_is_on DoCoreLinting -- ToDo: DoStgLinting flag
- then lintStgBindings ppr_style
+ stg_linter = if opt_DoStgLinting
+ then lintStgBindings
else ( \ whodunnit binds -> binds )
-------------------------------------------
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,
_scc_ "StgLambdaLift"
-- NB We have to do setStgVarInfo first!
let
- binds3 = liftProgram us1 (setStgVarInfo do_let_no_escapes binds)
+ binds3 = liftProgram module_name us1 (setStgVarInfo opt_StgDoLetNoEscapes binds)
in
end_pass us2 "LambdaLift" 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))
+ (if opt_D_verbose_stg2stg then
+ hPutStr stderr (showSDoc
+ (text ("*** "++what++":") $$ vcat (map ppr binds2)
))
else return ()) >>
let
foldl_mn f z (x:xs) = f z x >>= \ zz ->
foldl_mn f zz xs
\end{code}
-
-
projects / ghc-hetmet.git / blobdiff