protoCmmCPSZ
) where
+import CLabel
import Cmm
+import CmmBuildInfoTables
import CmmCommonBlockElimZ
import CmmProcPointZ
import CmmSpillReload
+import CmmStackLayout
import DFMonad
import PprCmmZ()
import ZipCfgCmmRep
import DynFlags
import ErrUtils
+import FiniteMap
import HscTypes
+import Maybe
import Monad
import Outputable
+import StaticFlags
-----------------------------------------------------------------------------
-- |Top level driver for the CPS pass
-----------------------------------------------------------------------------
+-- There are two complications here:
+-- 1. We need to compile the procedures in two stages because we need
+-- an analysis of the procedures to tell us what CAFs they use.
+-- The first stage returns a map from procedure labels to CAFs,
+-- along with a closure that will compute SRTs and attach them to
+-- the compiled procedures.
+-- The second stage is to combine the CAF information into a top-level
+-- CAF environment mapping non-static closures to the CAFs they keep live,
+-- then pass that environment to the closures returned in the first
+-- stage of compilation.
+-- 2. We need to thread the module's SRT around when the SRT tables
+-- are computed for each procedure.
+-- The SRT needs to be threaded because it is grown lazily.
protoCmmCPSZ :: HscEnv -- Compilation env including
-- dynamic flags: -dcmm-lint -ddump-cps-cmm
- -> CmmZ -- Input C-- with Proceedures
- -> IO CmmZ -- Output CPS transformed C--
-protoCmmCPSZ hsc_env (Cmm tops)
+ -> (TopSRT, [CmmZ]) -- SRT table and
+ -> CmmZ -- Input C-- with Procedures
+ -> IO (TopSRT, [CmmZ]) -- Output CPS transformed C--
+protoCmmCPSZ hsc_env (topSRT, rst) (Cmm tops)
| not (dopt Opt_RunCPSZ (hsc_dflags hsc_env))
- = return (Cmm tops) -- Only if -frun-cps
+ = return (topSRT, Cmm tops : rst) -- Only if -frun-cps
| otherwise
= do let dflags = hsc_dflags hsc_env
showPass dflags "CPSZ"
- tops <- liftM concat $ mapM (cpsTop hsc_env) tops
- dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "Post CPS Cmm" (ppr (Cmm tops))
- return $ Cmm tops
+ (cafEnvs, toTops) <- liftM unzip $ mapM (cpsTop hsc_env) tops
+ let topCAFEnv = mkTopCAFInfo (concat cafEnvs)
+ (topSRT, tops) <- foldM (\ z f -> f topCAFEnv z) (topSRT, []) toTops
+ let cmms = Cmm (reverse (concat tops))
+ dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "Post CPS Cmm" (ppr cmms)
+ return (topSRT, cmms : rst)
{- [Note global fuel]
~~~~~~~~~~~~~~~~~~~~~
global to one compiler session.
-}
-cpsTop :: HscEnv -> CmmTopZ -> IO [CmmTopZ]
-cpsTop _ p@(CmmData {}) = return [p]
+cpsTop :: HscEnv -> CmmTopZ ->
+ IO ([(CLabel, CAFSet)],
+ (FiniteMap CLabel CAFSet -> (TopSRT, [[CmmTopZ]]) -> IO (TopSRT, [[CmmTopZ]])))
+cpsTop _ p@(CmmData {}) =
+ return ([], (\ _ (topSRT, tops) -> return (topSRT, [p] : tops)))
cpsTop hsc_env (CmmProc h l args g) =
- do dump Opt_D_dump_cmmz "Pre Proc Points Added" g
+ do
+ dump Opt_D_dump_cmmz "Pre Proc Points Added" g
let callPPs = callProcPoints g
g <- dual_rewrite Opt_D_dump_cmmz "spills and reloads"
(dualLivenessWithInsertion callPPs) g
+ g <- dual_rewrite Opt_D_dump_cmmz "Dead Assignment Elimination"
+ (removeDeadAssignmentsAndReloads callPPs) g
dump Opt_D_dump_cmmz "Pre common block elimination" g
g <- return $ elimCommonBlocks g
dump Opt_D_dump_cmmz "Post common block elimination" g
procPoints <- run $ minimalProcPointSet callPPs g
- print $ "call procPoints: " ++ (showSDoc $ ppr procPoints)
+ -- print $ "call procPoints: " ++ (showSDoc $ ppr procPoints)
g <- run $ addProcPointProtocols callPPs procPoints g
dump Opt_D_dump_cmmz "Post Proc Points Added" g
g <- dual_rewrite Opt_D_dump_cmmz "spills and reloads"
(dualLivenessWithInsertion procPoints) g
-- Insert spills at defns; reloads at return points
- g <- run $ insertLateReloads' g -- Duplicate reloads just before uses
+ g <- run $ insertLateReloads g -- Duplicate reloads just before uses
dump Opt_D_dump_cmmz "Post late reloads" g
g <- dual_rewrite Opt_D_dump_cmmz "Dead Assignment Elimination"
(removeDeadAssignmentsAndReloads procPoints) g
-- Remove redundant reloads (and any other redundant asst)
+ -- Debugging: stubbing slots on death can cause crashes early
+ g <- if opt_StubDeadValues then run $ stubSlotsOnDeath g else return g
+ mbpprTrace "graph before procPointMap: " (ppr g) $ return ()
+ procPointMap <- run $ procPointAnalysis procPoints g
slotEnv <- run $ liveSlotAnal g
- print $ "live slot analysis results: " ++ (showSDoc $ ppr slotEnv)
+ mbpprTrace "live slot analysis results: " (ppr slotEnv) $ return ()
cafEnv <- run $ cafAnal g
- print $ "live CAF analysis results: " ++ (showSDoc $ ppr cafEnv)
- slotIGraph <- return $ igraph areaBuilder slotEnv g
- print $ "slot IGraph: " ++ (showSDoc $ ppr slotIGraph)
- print $ "graph before procPointMap: " ++ (showSDoc $ ppr g)
- procPointMap <- run $ procPointAnalysis procPoints g
+ (cafEnv, slotEnv) <- return $ extendEnvsForSafeForeignCalls cafEnv slotEnv g
+ mbpprTrace "slotEnv extended for safe foreign calls: " (ppr slotEnv) $ return ()
let areaMap = layout procPoints slotEnv g
+ mbpprTrace "areaMap" (ppr areaMap) $ return ()
g <- run $ manifestSP procPoints procPointMap areaMap g
- procPointMap <- run $ procPointAnalysis procPoints g
- gs <- run $ splitAtProcPoints l callPPs procPoints procPointMap slotEnv areaMap
- (CmmProc h l args g)
- return gs
- --return $ [CmmProc h l args (runTx cmmCfgOptsZ g)]
+ dump Opt_D_dump_cmmz "after manifestSP" g
+ -- UGH... manifestSP can require updates to the procPointMap.
+ -- We can probably do something quicker here for the update...
+ procPointMap <- run $ procPointAnalysis procPoints g
+ gs <- pprTrace "procPointMap" (ppr procPointMap) $
+ run $ splitAtProcPoints l callPPs procPoints procPointMap areaMap
+ (CmmProc h l args g)
+ mapM (dump Opt_D_dump_cmmz "after splitting") gs
+ let localCAFs = catMaybes $ map (localCAFInfo cafEnv) gs
+ mbpprTrace "localCAFs" (ppr localCAFs) $ return ()
+ gs <- liftM concat $ run $ foldM (lowerSafeForeignCalls procPoints) [] gs
+ mapM (dump Opt_D_dump_cmmz "after lowerSafeForeignCalls") gs
+
+ -- NO MORE GRAPH TRANSFORMATION AFTER HERE -- JUST MAKING INFOTABLES
+ let gs' = map (setInfoTableStackMap slotEnv areaMap) gs
+ mapM (dump Opt_D_dump_cmmz "after setInfoTableStackMap") gs'
+ -- Return: (a) CAFs used by this proc (b) a closure that will compute
+ -- a new SRT for the procedure.
+ let toTops topCAFEnv (topSRT, tops) =
+ do let setSRT (topSRT, rst) g =
+ do (topSRT, gs) <- setInfoTableSRT cafEnv topCAFEnv topSRT g
+ return (topSRT, gs : rst)
+ (topSRT, gs') <- run $ foldM setSRT (topSRT, []) gs'
+ gs' <- mapM finishInfoTables (concat gs')
+ pprTrace "localCAFs" (ppr localCAFs <+> ppr topSRT) $
+ return (topSRT, concat gs' : tops)
+ return (localCAFs, toTops)
where dflags = hsc_dflags hsc_env
+ mbpprTrace x y z = if dopt Opt_D_dump_cmmz dflags then pprTrace x y z else z
dump f txt g = dumpIfSet_dyn dflags f txt (ppr g)
run = runFuelIO (hsc_OptFuel hsc_env)
dual_rewrite flag txt pass g =
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