2 -- | Converts C-- with full proceedures and parameters
3 -- to a CPS transformed C-- with the stack made manifest.
9 import CmmCommonBlockElimZ
22 -----------------------------------------------------------------------------
23 -- |Top level driver for the CPS pass
24 -----------------------------------------------------------------------------
25 protoCmmCPSZ :: HscEnv -- Compilation env including
26 -- dynamic flags: -dcmm-lint -ddump-cps-cmm
27 -> CmmZ -- Input C-- with Proceedures
28 -> IO CmmZ -- Output CPS transformed C--
29 protoCmmCPSZ hsc_env (Cmm tops)
30 | not (dopt Opt_RunCPSZ (hsc_dflags hsc_env))
31 = return (Cmm tops) -- Only if -frun-cps
33 = do let dflags = hsc_dflags hsc_env
34 showPass dflags "CPSZ"
35 tops <- liftM concat $ mapM (cpsTop hsc_env) tops
36 dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "Post CPS Cmm" (ppr (Cmm tops))
41 The identity and the last pass are stored in
42 mutable reference cells in an 'HscEnv' and are
43 global to one compiler session.
46 cpsTop :: HscEnv -> CmmTopZ -> IO [CmmTopZ]
47 cpsTop _ p@(CmmData {}) = return [p]
48 cpsTop hsc_env (CmmProc h l args g) =
49 do dump Opt_D_dump_cmmz "Pre Proc Points Added" g
50 let callPPs = callProcPoints g
51 g <- dual_rewrite Opt_D_dump_cmmz "spills and reloads"
52 (dualLivenessWithInsertion callPPs) g
53 dump Opt_D_dump_cmmz "Pre common block elimination" g
54 g <- return $ elimCommonBlocks g
55 dump Opt_D_dump_cmmz "Post common block elimination" g
56 procPoints <- run $ minimalProcPointSet callPPs g
57 print $ "call procPoints: " ++ (showSDoc $ ppr procPoints)
58 g <- run $ addProcPointProtocols callPPs procPoints g
59 dump Opt_D_dump_cmmz "Post Proc Points Added" g
60 g <- dual_rewrite Opt_D_dump_cmmz "spills and reloads"
61 (dualLivenessWithInsertion procPoints) g
62 -- Insert spills at defns; reloads at return points
63 g <- run $ insertLateReloads' g -- Duplicate reloads just before uses
64 dump Opt_D_dump_cmmz "Post late reloads" g
65 g <- dual_rewrite Opt_D_dump_cmmz "Dead Assignment Elimination"
66 (removeDeadAssignmentsAndReloads procPoints) g
67 -- Remove redundant reloads (and any other redundant asst)
68 slotEnv <- run $ liveSlotAnal g
69 print $ "live slot analysis results: " ++ (showSDoc $ ppr slotEnv)
70 cafEnv <- run $ cafAnal g
71 print $ "live CAF analysis results: " ++ (showSDoc $ ppr cafEnv)
72 slotIGraph <- return $ igraph areaBuilder slotEnv g
73 print $ "slot IGraph: " ++ (showSDoc $ ppr slotIGraph)
74 print $ "graph before procPointMap: " ++ (showSDoc $ ppr g)
75 procPointMap <- run $ procPointAnalysis procPoints g
76 let areaMap = layout procPoints slotEnv g
77 g <- run $ manifestSP procPoints procPointMap areaMap g
78 procPointMap <- run $ procPointAnalysis procPoints g
79 gs <- run $ splitAtProcPoints l callPPs procPoints procPointMap slotEnv areaMap
82 --return $ [CmmProc h l args (runTx cmmCfgOptsZ g)]
83 where dflags = hsc_dflags hsc_env
84 dump f txt g = dumpIfSet_dyn dflags f txt (ppr g)
85 run = runFuelIO (hsc_OptFuel hsc_env)
86 dual_rewrite flag txt pass g =
87 do dump flag ("Pre " ++ txt) g
89 dump flag ("Post " ++ txt) $ g