X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2FCmmCPSZ.hs;h=23e57d72b6c453f890b21949c821f2c4e12bbaeb;hp=b6b77f0f10b75ceb39510cb7807ab50c0b69716f;hb=edc0bafd3fcd01b85a2e8894e5dfe149eb0e0857;hpb=0d80489c9b9f2421f65d8dd86c1e50c6bb429715 diff --git a/compiler/cmm/CmmCPSZ.hs b/compiler/cmm/CmmCPSZ.hs index b6b77f0..23e57d7 100644 --- a/compiler/cmm/CmmCPSZ.hs +++ b/compiler/cmm/CmmCPSZ.hs @@ -1,3 +1,7 @@ +{-# OPTIONS_GHC -XNoMonoLocalBinds #-} +-- Norman likes local bindings +-- If this module lives on I'd like to get rid of this flag in due course + module CmmCPSZ ( -- | Converts C-- with full proceedures and parameters -- to a CPS transformed C-- with the stack made manifest. @@ -5,42 +9,58 @@ module CmmCPSZ ( protoCmmCPSZ ) where -import BlockId +import CLabel import Cmm +import CmmBuildInfoTables import CmmCommonBlockElimZ -import CmmContFlowOpt import CmmProcPointZ import CmmSpillReload -import CmmTx +import CmmStackLayout import DFMonad import PprCmmZ() -import ZipCfg hiding (zip, unzip) import ZipCfgCmmRep import DynFlags import ErrUtils -import FiniteMap import HscTypes -import Monad +import Data.Maybe +import Control.Monad +import Data.Map (Map) +import qualified Data.Map as Map import Outputable -import UniqSupply +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) - | not (dopt Opt_RunCPSZ (hsc_dflags hsc_env)) - = return (Cmm tops) -- Only if -frun-cps - | otherwise - = do let dflags = hsc_dflags hsc_env - showPass dflags "CPSZ" - tops <- mapM (cpsTop hsc_env) tops - dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "Post CPS Cmm" (ppr (Cmm tops)) - return $ Cmm tops + -> (TopSRT, [CmmZ]) -- SRT table and accumulating list of compiled procs + -> CmmZ -- Input C-- with Procedures + -> IO (TopSRT, [CmmZ]) -- Output CPS transformed C-- +protoCmmCPSZ hsc_env (topSRT, rst) (Cmm tops) = + do let dflags = hsc_dflags hsc_env + showPass dflags "CPSZ" + (cafEnvs, tops) <- liftM unzip $ mapM (cpsTop hsc_env) tops + let topCAFEnv = mkTopCAFInfo (concat cafEnvs) + (topSRT, tops) <- foldM (toTops hsc_env topCAFEnv) (topSRT, []) tops + -- (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] ~~~~~~~~~~~~~~~~~~~~~ @@ -49,44 +69,115 @@ mutable reference cells in an 'HscEnv' and are global to one compiler session. -} -cpsTop :: HscEnv -> CmmTopZ -> IO CmmTopZ -cpsTop _ p@(CmmData {}) = return p -cpsTop hsc_env (CmmProc h l args g) = - do dump Opt_D_dump_cmmz "Pre Proc Points Added" g +cpsTop :: HscEnv -> CmmTopZ -> + IO ([(CLabel, CAFSet)], + [(CAFSet, CmmTopForInfoTables)]) +cpsTop _ p@(CmmData {}) = return ([], [(Map.empty, NoInfoTable p)]) +cpsTop hsc_env (CmmProc h l args (stackInfo@(entry_off, _), g)) = + do + dump Opt_D_dump_cmmz "Pre Proc Points Added" g let callPPs = callProcPoints g - g <- return $ map_nodes id NotSpillOrReload id g - -- Change types of middle nodes to allow spill/reload - g <- dual_rewrite Opt_D_dump_cmmz "spills and reloads" - (dualLivenessWithInsertion callPPs) g - (varSlots, g) <- trim g >>= return . elimSpillAndReload emptyFM - procPoints <- run $ minimalProcPointSet callPPs (runTx cmmCfgOptsZ g) + -- Why bother doing it this early? + -- g <- dual_rewrite Opt_D_dump_cmmz "spills and reloads" + -- (dualLivenessWithInsertion callPPs) g + -- g <- run $ insertLateReloads g -- Duplicate reloads just before uses + -- 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 + + ----------- Proc points ------------------- + procPoints <- run $ minimalProcPointSet callPPs g g <- run $ addProcPointProtocols callPPs procPoints g dump Opt_D_dump_cmmz "Post Proc Points Added" g - g <- return $ map_nodes id NotSpillOrReload id g - -- Change types of middle nodes to allow spill/reload - g <- dual_rewrite Opt_D_dump_cmmz "spills and reloads" + + ----------- Spills and reloads ------------------- + g <- + -- pprTrace "pre Spills" (ppr 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 <- + -- pprTrace "pre insertLateReloads" (ppr g) $ + run $ insertLateReloads g -- Duplicate reloads just before uses dump Opt_D_dump_cmmz "Post late reloads" g - g <- trim g >>= dual_rewrite Opt_D_dump_cmmz "Dead Assignment Elimination" - (removeDeadAssignmentsAndReloads procPoints) + g <- + -- pprTrace "post insertLateReloads" (ppr g) $ + dual_rewrite Opt_D_dump_cmmz "Dead Assignment Elimination" + (removeDeadAssignmentsAndReloads procPoints) g -- Remove redundant reloads (and any other redundant asst) - (_, g) <- trim g >>= return . elimSpillAndReload varSlots - gs <- run $ splitAtProcPoints args l procPoints g - gs `seq` dump Opt_D_dump_cmmz "Pre common block elimination" g - g <- return $ elimCommonBlocks g - dump Opt_D_dump_cmmz "Post common block elimination" g - return $ CmmProc h l args (runTx cmmCfgOptsZ g) + + ----------- Debug only: add code to put zero in dead stack slots---- + -- Debugging: stubbing slots on death can cause crashes early + g <- + -- trace "post dead-assign elim" $ + if opt_StubDeadValues then run $ stubSlotsOnDeath g else return g + + + --------------- Stack layout ---------------- + slotEnv <- run $ liveSlotAnal g + mbpprTrace "live slot analysis results: " (ppr slotEnv) $ return () + -- cafEnv <- -- trace "post liveSlotAnal" $ run $ cafAnal g + -- (cafEnv, slotEnv) <- + -- -- trace "post print cafAnal" $ + -- return $ extendEnvsForSafeForeignCalls cafEnv slotEnv g + slotEnv <- return $ extendEnvWithSafeForeignCalls liveSlotTransfers slotEnv g + mbpprTrace "slotEnv extended for safe foreign calls: " (ppr slotEnv) $ return () + let areaMap = layout procPoints slotEnv entry_off g + mbpprTrace "areaMap" (ppr areaMap) $ return () + + ------------ Manifest the the stack pointer -------- + g <- run $ manifestSP areaMap entry_off 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... + + ------------- Split into separate procedures ------------ + procPointMap <- run $ procPointAnalysis procPoints g + dump Opt_D_dump_cmmz "procpoint map" procPointMap + gs <- run $ splitAtProcPoints l callPPs procPoints procPointMap + (CmmProc h l args (stackInfo, g)) + mapM_ (dump Opt_D_dump_cmmz "after splitting") gs + + ------------- More CAFs and foreign calls ------------ + cafEnv <- run $ cafAnal g + cafEnv <- return $ extendEnvWithSafeForeignCalls cafTransfers cafEnv g + let localCAFs = catMaybes $ map (localCAFInfo cafEnv) gs + mbpprTrace "localCAFs" (ppr localCAFs) $ return () + + gs <- liftM concat $ run $ foldM lowerSafeForeignCalls [] 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' + let gs'' = map (bundleCAFs cafEnv) gs' + mapM_ (dump Opt_D_dump_cmmz "after bundleCAFs") gs'' + return (localCAFs, gs'') 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 :: FuelMonad a -> IO a run = runFuelIO (hsc_OptFuel hsc_env) + dual_rewrite flag txt pass g = do dump flag ("Pre " ++ txt) g - g <- run $ pass (graphOfLGraph g) >>= lGraphOfGraph + g <- run $ pass g dump flag ("Post " ++ txt) $ g - return $ graphOfLGraph g - trim (Graph (ZLast (LastOther (LastBranch id))) blocks) = return $ LGraph id blocks - trim (Graph tail blocks) = - do entry <- liftM BlockId $ run $ getUniqueM - return $ LGraph entry (insertBlock (Block entry tail) blocks) + return g + +-- This probably belongs in CmmBuildInfoTables? +-- We're just finishing the job here: once we know what CAFs are defined +-- in non-static closures, we can build the SRTs. +toTops :: HscEnv -> Map CLabel CAFSet -> (TopSRT, [[CmmTopZ]]) + -> [(CAFSet, CmmTopForInfoTables)] -> IO (TopSRT, [[CmmTopZ]]) + +toTops hsc_env topCAFEnv (topSRT, tops) gs = + do let setSRT (topSRT, rst) g = + do (topSRT, gs) <- setInfoTableSRT topCAFEnv topSRT g + return (topSRT, gs : rst) + (topSRT, gs') <- runFuelIO (hsc_OptFuel hsc_env) $ foldM setSRT (topSRT, []) gs + gs' <- mapM finishInfoTables (concat gs') + return (topSRT, concat gs' : tops)