-
module CmmCPSZ (
-- | Converts C-- with full proceedures and parameters
-- to a CPS transformed C-- with the stack made manifest.
protoCmmCPSZ
) where
+import CLabel
import Cmm
-import CmmContFlowOpt
+import CmmBuildInfoTables
+import CmmCommonBlockElimZ
import CmmProcPointZ
import CmmSpillReload
-import CmmTx
+import CmmStackLayout
import DFMonad
+import PprCmmZ()
+import ZipCfgCmmRep
+
import DynFlags
import ErrUtils
+import FiniteMap
+import HscTypes
+import Maybe
+import Monad
import Outputable
-import PprCmmZ()
-import UniqSupply
-import ZipCfg hiding (zip, unzip)
-import ZipCfgCmmRep
-import ZipDataflow
+import StaticFlags
-----------------------------------------------------------------------------
-- |Top level driver for the CPS pass
-----------------------------------------------------------------------------
-protoCmmCPSZ :: DynFlags -- ^ Dynamic flags: -dcmm-lint -ddump-cps-cmm
- -> CmmZ -- ^ Input C-- with Proceedures
- -> IO CmmZ -- ^ Output CPS transformed C--
-protoCmmCPSZ dflags (Cmm tops)
- = do { showPass dflags "CPSZ"
- ; u <- mkSplitUniqSupply 'p'
- ; let txtops = initUs_ u $ mapM cpsTop tops
- ; let pgm = Cmm $ runDFTx maxBound $ sequence txtops
- --- XXX calling runDFTx is totally bogus
- ; dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "CPS Cmm" (ppr pgm)
- ; return pgm
- }
+-- 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
+ -> (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 (topSRT, Cmm tops : rst) -- Only if -frun-cps
+ | otherwise
+ = do let dflags = hsc_dflags hsc_env
+ showPass dflags "CPSZ"
+ (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]
+~~~~~~~~~~~~~~~~~~~~~
+The identity and the last pass are stored in
+mutable reference cells in an 'HscEnv' and are
+global to one compiler session.
+-}
+
+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
+ 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)
+ 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
+ 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
+ mbpprTrace "live slot analysis results: " (ppr slotEnv) $ return ()
+ cafEnv <- run $ cafAnal 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
+ 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
-cpsTop :: CmmTopZ -> UniqSM (DFTx CmmTopZ)
-cpsTop p@(CmmData {}) = return $ return p
-cpsTop (CmmProc h l args g) =
- let procPoints = minimalProcPointSet (runTx cmmCfgOptsZ g)
- g' = addProcPointProtocols procPoints args g
- g'' = map_nodes id NotSpillOrReload id g'
- in do g <- dual_rewrite dualLivenessWithInsertion g''
- g <- return (g >>= insertLateReloads)
- u <- getUs
- let g' = g >>= (initUs_ u . dual_rewrite removeDeadAssignmentsAndReloads)
- return $ do g <- g' >>= return . map_nodes id spillAndReloadComments id
- return $ CmmProc h l args g
- where dual_rewrite pass g =
- do us <- getUs
- return $ runDFM us dualLiveLattice $ b_rewrite pass g
+ -- 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 =
+ do dump flag ("Pre " ++ txt) g
+ g <- run $ pass g
+ dump flag ("Post " ++ txt) $ g
+ return g
projects / ghc-hetmet.git / blobdiff