+++ /dev/null
-{-# 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 CmmCPS (
- -- | Converts C-- with an implicit stack and native C-- calls into
- -- optimized, CPS converted and native-call-less C--. The latter
- -- C-- can be used to generate assembly.
- cmmPipeline
-) where
-
-import CLabel
-import Cmm
-import CmmDecl
-import CmmBuildInfoTables
-import CmmCommonBlockElim
-import CmmProcPoint
-import CmmSpillReload
-import CmmStackLayout
-import CmmContFlowOpt
-import OptimizationFuel
-
-import DynFlags
-import ErrUtils
-import HscTypes
-import Data.Maybe
-import Control.Monad
-import Data.Map (Map)
-import qualified Data.Map as Map
-import Outputable
-import StaticFlags
-
------------------------------------------------------------------------------
--- | Top level driver for C-- pipeline
------------------------------------------------------------------------------
--- 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.
--- 3. We run control flow optimizations twice, once before any pipeline
--- work is done, and once again at the very end on all of the
--- resulting C-- blocks. EZY: It's unclear whether or not whether
--- we actually need to do the initial pass.
-cmmPipeline :: HscEnv -- Compilation env including
- -- dynamic flags: -dcmm-lint -ddump-cps-cmm
- -> (TopSRT, [Cmm]) -- SRT table and accumulating list of compiled procs
- -> Cmm -- Input C-- with Procedures
- -> IO (TopSRT, [Cmm]) -- Output CPS transformed C--
-cmmPipeline hsc_env (topSRT, rst) prog =
- do let dflags = hsc_dflags hsc_env
- (Cmm tops) = runCmmContFlowOpts prog
- 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
- let cmms = Cmm (reverse (concat tops))
- dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "Post CPS Cmm" (ppr cmms)
- -- SRT is not affected by control flow optimization pass
- let prog' = map runCmmContFlowOpts (cmms : rst)
- return (topSRT, prog')
-
-{- [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.
--}
-
--- EZY: It might be helpful to have an easy way of dumping the "pre"
--- input for any given phase, besides just turning it all on with
--- -ddump-cmmz
-
-cpsTop :: HscEnv -> CmmTop -> IO ([(CLabel, CAFSet)], [(CAFSet, CmmTop)])
-cpsTop _ p@(CmmData {}) = return ([], [(Map.empty, p)])
-cpsTop hsc_env (CmmProc h@(TopInfo {stack_info=StackInfo {arg_space=entry_off}}) l g) =
- do
- -- Why bother doing these early: dualLivenessWithInsertion,
- -- insertLateReloads, rewriteAssignments?
-
- ----------- Eliminate common blocks -------------------
- g <- return $ elimCommonBlocks g
- dump Opt_D_dump_cmmz_cbe "Post common block elimination" g
- -- Any work storing block Labels must be performed _after_ elimCommonBlocks
-
- ----------- Proc points -------------------
- let callPPs = callProcPoints g
- procPoints <- run $ minimalProcPointSet callPPs g
- g <- run $ addProcPointProtocols callPPs procPoints g
- dump Opt_D_dump_cmmz_proc "Post Proc Points Added" g
-
- ----------- Spills and reloads -------------------
- g <- run $ dualLivenessWithInsertion procPoints g
- dump Opt_D_dump_cmmz_spills "Post spills and reloads" g
-
- ----------- Sink and inline assignments -------------------
- g <- runOptimization $ rewriteAssignments g
- dump Opt_D_dump_cmmz_rewrite "Post rewrite assignments" g
-
- ----------- Eliminate dead assignments -------------------
- -- Remove redundant reloads (and any other redundant asst)
- g <- runOptimization $ removeDeadAssignmentsAndReloads procPoints g
- dump Opt_D_dump_cmmz_dead "Post Dead Assignment Elimination" g
-
- ----------- Zero dead stack slots (Debug only) ---------------
- -- Debugging: stubbing slots on death can cause crashes early
- g <- if opt_StubDeadValues
- then run $ stubSlotsOnDeath g
- else return g
- dump Opt_D_dump_cmmz_stub "Post stub dead stack slots" g
-
- --------------- Stack layout ----------------
- slotEnv <- run $ liveSlotAnal g
- let spEntryMap = getSpEntryMap entry_off g
- mbpprTrace "live slot analysis results: " (ppr slotEnv) $ return ()
- let areaMap = layout procPoints spEntryMap slotEnv entry_off g
- mbpprTrace "areaMap" (ppr areaMap) $ return ()
-
- ------------ Manifest the stack pointer --------
- g <- run $ manifestSP spEntryMap areaMap entry_off g
- dump Opt_D_dump_cmmz_sp "Post 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_procmap "procpoint map" procPointMap
- gs <- run $ splitAtProcPoints l callPPs procPoints procPointMap
- (CmmProc h l g)
- mapM_ (dump Opt_D_dump_cmmz_split "Post splitting") gs
-
- ------------- More CAFs and foreign calls ------------
- cafEnv <- run $ cafAnal g
- let localCAFs = catMaybes $ map (localCAFInfo cafEnv) gs
- mbpprTrace "localCAFs" (ppr localCAFs) $ return ()
-
- gs <- run $ mapM (lowerSafeForeignCalls areaMap) gs
- mapM_ (dump Opt_D_dump_cmmz_lower "Post lowerSafeForeignCalls") gs
-
- -- NO MORE GRAPH TRANSFORMATION AFTER HERE -- JUST MAKING INFOTABLES
- gs <- return $ map (setInfoTableStackMap slotEnv areaMap) gs
- mapM_ (dump Opt_D_dump_cmmz_info "after setInfoTableStackMap") gs
- gs <- return $ map (bundleCAFs cafEnv) gs
- mapM_ (dump Opt_D_dump_cmmz_cafs "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 = do
- -- ToDo: No easy way of say "dump all the cmmz, *and* split
- -- them into files." Also, -ddump-cmmz doesn't play nicely
- -- with -ddump-to-file, since the headers get omitted.
- dumpIfSet_dyn dflags f txt (ppr g)
- when (not (dopt f dflags)) $
- dumpIfSet_dyn dflags Opt_D_dump_cmmz txt (ppr g)
- -- Runs a required transformation/analysis
- run = runInfiniteFuelIO (hsc_OptFuel hsc_env)
- -- Runs an optional transformation/analysis (and should
- -- thus be subject to optimization fuel)
- runOptimization = runFuelIO (hsc_OptFuel hsc_env)
-
--- 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, [[CmmTop]])
- -> [(CAFSet, CmmTop)] -> IO (TopSRT, [[CmmTop]])
-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
- return (topSRT, concat gs' : tops)
projects / ghc-hetmet.git / blobdiff