X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FnativeGen%2FAsmCodeGen.lhs;h=a5988fc62bab8bde97543026ab390bb18aababc3;hp=ec022042c3ec823d5b94c346c5b422552b7be8c5;hb=8133a9f47b99f4e65ed30551de32ad72c6b61b27;hpb=0f7d268d00795a58a06ae3c92ebbd14571295b84 diff --git a/compiler/nativeGen/AsmCodeGen.lhs b/compiler/nativeGen/AsmCodeGen.lhs index ec02204..a5988fc 100644 --- a/compiler/nativeGen/AsmCodeGen.lhs +++ b/compiler/nativeGen/AsmCodeGen.lhs @@ -12,54 +12,73 @@ module AsmCodeGen ( nativeCodeGen ) where #include "HsVersions.h" #include "nativeGen/NCG.h" -import MachInstrs -import MachRegs -import MachCodeGen -import PprMach -import RegAllocInfo + +import qualified X86.CodeGen +import qualified X86.Regs +import qualified X86.Instr +import qualified X86.Ppr + +import qualified SPARC.CodeGen +import qualified SPARC.Regs +import qualified SPARC.Instr +import qualified SPARC.Ppr +import qualified SPARC.ShortcutJump +import qualified SPARC.CodeGen.Expand + +import qualified PPC.CodeGen +import qualified PPC.Cond +import qualified PPC.Regs +import qualified PPC.RegInfo +import qualified PPC.Instr +import qualified PPC.Ppr + +import RegAlloc.Liveness +import qualified RegAlloc.Linear.Main as Linear + +import qualified GraphColor as Color +import qualified RegAlloc.Graph.Main as Color +import qualified RegAlloc.Graph.Stats as Color +import qualified RegAlloc.Graph.TrivColorable as Color + +import TargetReg +import Platform +import Config +import Instruction +import PIC +import Reg import NCGMonad -import PositionIndependentCode -import RegAllocLinear -import RegLiveness -import RegCoalesce -import qualified RegAllocColor as Color -import qualified GraphColor as Color - -import Cmm -import CmmOpt ( cmmMiniInline, cmmMachOpFold ) -import PprCmm ( pprStmt, pprCmms, pprCmm ) -import MachOp + +import BlockId +import CgUtils ( fixStgRegisters ) +import OldCmm +import CmmOpt ( cmmEliminateDeadBlocks, cmmMiniInline, cmmMachOpFold ) +import OldPprCmm import CLabel import UniqFM import Unique ( Unique, getUnique ) import UniqSupply -import FastTypes -import List ( groupBy, sortBy ) -import ErrUtils ( dumpIfSet_dyn ) import DynFlags -import StaticFlags ( opt_Static, opt_PIC ) +import StaticFlags import Util -import Config ( cProjectVersion ) import Digraph +import Pretty (Doc) import qualified Pretty +import BufWrite import Outputable import FastString import UniqSet +import ErrUtils +import Module -- DEBUGGING ONLY --import OrdList -#ifdef NCG_DEBUG -import List ( intersperse ) -#endif - -import Data.Int -import Data.Word -import Data.Bits +import Data.List import Data.Maybe -import GHC.Exts +import Control.Monad +import System.IO {- The native-code generator has machine-independent and @@ -112,69 +131,367 @@ The machine-dependent bits break down as follows: -- ----------------------------------------------------------------------------- -- Top-level of the native codegen --- NB. We *lazilly* compile each block of code for space reasons. +data NcgImpl instr jumpDest = NcgImpl { + cmmTopCodeGen :: RawCmmTop -> NatM [NatCmmTop instr], + generateJumpTableForInstr :: instr -> Maybe (NatCmmTop instr), + getJumpDestBlockId :: jumpDest -> Maybe BlockId, + canShortcut :: instr -> Maybe jumpDest, + shortcutStatic :: (BlockId -> Maybe jumpDest) -> CmmStatic -> CmmStatic, + shortcutJump :: (BlockId -> Maybe jumpDest) -> instr -> instr, + pprNatCmmTop :: NatCmmTop instr -> Doc, + maxSpillSlots :: Int, + allocatableRegs :: [RealReg], + ncg_x86fp_kludge :: [NatCmmTop instr] -> [NatCmmTop instr], + ncgExpandTop :: [NatCmmTop instr] -> [NatCmmTop instr], + ncgMakeFarBranches :: [NatBasicBlock instr] -> [NatBasicBlock instr] + } -------------------- -nativeCodeGen :: DynFlags -> [RawCmm] -> UniqSupply -> IO Pretty.Doc -nativeCodeGen dflags cmms us - = let (res, _) = initUs us $ - cgCmm (concat (map add_split cmms)) - - cgCmm :: [RawCmmTop] -> UniqSM ( [CmmNativeGenDump], Pretty.Doc, [CLabel]) - cgCmm tops = - lazyMapUs (cmmNativeGen dflags) tops `thenUs` \ results -> - case unzip3 results of { (dump,docs,imps) -> - returnUs (dump, my_vcat docs, concat imps) - } - in - case res of { (dump, insn_sdoc, imports) -> do - - -- stripe across the outputs for each block so all the information for a - -- certain stage is concurrent in the dumps. - - dumpIfSet_dyn dflags - Opt_D_dump_opt_cmm "Optimised Cmm" - (pprCmm $ Cmm $ map cdCmmOpt dump) - - dumpIfSet_dyn dflags - Opt_D_dump_asm_native "(asm-native) Native code" - (vcat $ map (docToSDoc . pprNatCmmTop) $ concatMap cdNative dump) - - dumpIfSet_dyn dflags - Opt_D_dump_asm_liveness "(asm-liveness) Liveness info added" - (vcat $ map (ppr . cdLiveness) dump) - - dumpIfSet_dyn dflags - Opt_D_dump_asm_coalesce "(asm-coalesce) Register moves coalesced." - (vcat $ map (ppr . cdCoalesce) dump) - - dumpIfSet_dyn dflags - Opt_D_dump_asm_regalloc "(asm-regalloc) Registers allocated" - (vcat $ map (docToSDoc . pprNatCmmTop) $ concatMap cdAlloced dump) - - -- with the graph coloring allocator, show the result of each build/spill stage - -- for each block in turn. - mapM_ (\codeGraphs - -> dumpIfSet_dyn dflags - Opt_D_dump_asm_regalloc_stages - "(asm-regalloc-stages)" - (vcat $ map (\(stage, (code, graph)) -> - ( text "-- Stage " <> int stage - $$ ppr code - $$ Color.dotGraph Color.regDotColor trivColorable graph)) - (zip [0..] codeGraphs))) - $ map cdCodeGraphs dump - - -- Build a global register conflict graph. - -- If you want to see the graph for just one basic block then use asm-regalloc-stages instead. - dumpIfSet_dyn dflags - Opt_D_dump_asm_conflicts "(asm-conflicts) Register conflict graph" - $ Color.dotGraph Color.regDotColor trivColorable - $ foldl Color.union Color.initGraph - $ catMaybes $ map cdColoredGraph dump - - - return (insn_sdoc Pretty.$$ dyld_stubs imports +nativeCodeGen :: DynFlags -> Handle -> UniqSupply -> [RawCmm] -> IO () +nativeCodeGen dflags h us cmms + = let nCG' ncgImpl = nativeCodeGen' dflags ncgImpl h us cmms + x86NcgImpl = NcgImpl { + cmmTopCodeGen = X86.CodeGen.cmmTopCodeGen + ,generateJumpTableForInstr = X86.CodeGen.generateJumpTableForInstr + ,getJumpDestBlockId = X86.Instr.getJumpDestBlockId + ,canShortcut = X86.Instr.canShortcut + ,shortcutStatic = X86.Instr.shortcutStatic + ,shortcutJump = X86.Instr.shortcutJump + ,pprNatCmmTop = X86.Ppr.pprNatCmmTop + ,maxSpillSlots = X86.Instr.maxSpillSlots + ,allocatableRegs = X86.Regs.allocatableRegs + ,ncg_x86fp_kludge = id + ,ncgExpandTop = id + ,ncgMakeFarBranches = id + } + in case platformArch $ targetPlatform dflags of + ArchX86 -> nCG' (x86NcgImpl { ncg_x86fp_kludge = map x86fp_kludge }) + ArchX86_64 -> nCG' x86NcgImpl + ArchPPC -> + nCG' $ NcgImpl { + cmmTopCodeGen = PPC.CodeGen.cmmTopCodeGen + ,generateJumpTableForInstr = PPC.CodeGen.generateJumpTableForInstr + ,getJumpDestBlockId = PPC.RegInfo.getJumpDestBlockId + ,canShortcut = PPC.RegInfo.canShortcut + ,shortcutStatic = PPC.RegInfo.shortcutStatic + ,shortcutJump = PPC.RegInfo.shortcutJump + ,pprNatCmmTop = PPC.Ppr.pprNatCmmTop + ,maxSpillSlots = PPC.Instr.maxSpillSlots + ,allocatableRegs = PPC.Regs.allocatableRegs + ,ncg_x86fp_kludge = id + ,ncgExpandTop = id + ,ncgMakeFarBranches = makeFarBranches + } + ArchSPARC -> + nCG' $ NcgImpl { + cmmTopCodeGen = SPARC.CodeGen.cmmTopCodeGen + ,generateJumpTableForInstr = SPARC.CodeGen.generateJumpTableForInstr + ,getJumpDestBlockId = SPARC.ShortcutJump.getJumpDestBlockId + ,canShortcut = SPARC.ShortcutJump.canShortcut + ,shortcutStatic = SPARC.ShortcutJump.shortcutStatic + ,shortcutJump = SPARC.ShortcutJump.shortcutJump + ,pprNatCmmTop = SPARC.Ppr.pprNatCmmTop + ,maxSpillSlots = SPARC.Instr.maxSpillSlots + ,allocatableRegs = SPARC.Regs.allocatableRegs + ,ncg_x86fp_kludge = id + ,ncgExpandTop = map SPARC.CodeGen.Expand.expandTop + ,ncgMakeFarBranches = id + } + ArchPPC_64 -> + panic "nativeCodeGen: No NCG for PPC 64" + ArchUnknown -> + panic "nativeCodeGen: No NCG for unknown arch" + +nativeCodeGen' :: (Instruction instr, Outputable instr) + => DynFlags + -> NcgImpl instr jumpDest + -> Handle -> UniqSupply -> [RawCmm] -> IO () +nativeCodeGen' dflags ncgImpl h us cmms + = do + let split_cmms = concat $ map add_split cmms + -- BufHandle is a performance hack. We could hide it inside + -- Pretty if it weren't for the fact that we do lots of little + -- printDocs here (in order to do codegen in constant space). + bufh <- newBufHandle h + (imports, prof) <- cmmNativeGens dflags ncgImpl bufh us split_cmms [] [] 0 + bFlush bufh + + let (native, colorStats, linearStats) + = unzip3 prof + + -- dump native code + dumpIfSet_dyn dflags + Opt_D_dump_asm "Asm code" + (vcat $ map (docToSDoc . pprNatCmmTop ncgImpl) $ concat native) + + -- dump global NCG stats for graph coloring allocator + (case concat $ catMaybes colorStats of + [] -> return () + stats -> do + -- build the global register conflict graph + let graphGlobal + = foldl Color.union Color.initGraph + $ [ Color.raGraph stat + | stat@Color.RegAllocStatsStart{} <- stats] + + dumpSDoc dflags Opt_D_dump_asm_stats "NCG stats" + $ Color.pprStats stats graphGlobal + + dumpIfSet_dyn dflags + Opt_D_dump_asm_conflicts "Register conflict graph" + $ Color.dotGraph + targetRegDotColor + (Color.trivColorable + targetVirtualRegSqueeze + targetRealRegSqueeze) + $ graphGlobal) + + + -- dump global NCG stats for linear allocator + (case concat $ catMaybes linearStats of + [] -> return () + stats -> dumpSDoc dflags Opt_D_dump_asm_stats "NCG stats" + $ Linear.pprStats (concat native) stats) + + -- write out the imports + Pretty.printDoc Pretty.LeftMode h + $ makeImportsDoc dflags (concat imports) + + return () + + where add_split (Cmm tops) + | dopt Opt_SplitObjs dflags = split_marker : tops + | otherwise = tops + + split_marker = CmmProc [] mkSplitMarkerLabel (ListGraph []) + + +-- | Do native code generation on all these cmms. +-- +cmmNativeGens :: (Instruction instr, Outputable instr) + => DynFlags + -> NcgImpl instr jumpDest + -> BufHandle + -> UniqSupply + -> [RawCmmTop] + -> [[CLabel]] + -> [ ([NatCmmTop instr], + Maybe [Color.RegAllocStats instr], + Maybe [Linear.RegAllocStats]) ] + -> Int + -> IO ( [[CLabel]], + [([NatCmmTop instr], + Maybe [Color.RegAllocStats instr], + Maybe [Linear.RegAllocStats])] ) + +cmmNativeGens _ _ _ _ [] impAcc profAcc _ + = return (reverse impAcc, reverse profAcc) + +cmmNativeGens dflags ncgImpl h us (cmm : cmms) impAcc profAcc count + = do + (us', native, imports, colorStats, linearStats) + <- cmmNativeGen dflags ncgImpl us cmm count + + Pretty.bufLeftRender h + $ {-# SCC "pprNativeCode" #-} Pretty.vcat $ map (pprNatCmmTop ncgImpl) native + + -- carefully evaluate this strictly. Binding it with 'let' + -- and then using 'seq' doesn't work, because the let + -- apparently gets inlined first. + lsPprNative <- return $! + if dopt Opt_D_dump_asm dflags + || dopt Opt_D_dump_asm_stats dflags + then native + else [] + + count' <- return $! count + 1; + + -- force evaulation all this stuff to avoid space leaks + seqString (showSDoc $ vcat $ map ppr imports) `seq` return () + + cmmNativeGens dflags ncgImpl + h us' cmms + (imports : impAcc) + ((lsPprNative, colorStats, linearStats) : profAcc) + count' + + where seqString [] = () + seqString (x:xs) = x `seq` seqString xs `seq` () + + +-- | Complete native code generation phase for a single top-level chunk of Cmm. +-- Dumping the output of each stage along the way. +-- Global conflict graph and NGC stats +cmmNativeGen + :: (Instruction instr, Outputable instr) + => DynFlags + -> NcgImpl instr jumpDest + -> UniqSupply + -> RawCmmTop -- ^ the cmm to generate code for + -> Int -- ^ sequence number of this top thing + -> IO ( UniqSupply + , [NatCmmTop instr] -- native code + , [CLabel] -- things imported by this cmm + , Maybe [Color.RegAllocStats instr] -- stats for the coloring register allocator + , Maybe [Linear.RegAllocStats]) -- stats for the linear register allocators + +cmmNativeGen dflags ncgImpl us cmm count + = do + + -- rewrite assignments to global regs + let fixed_cmm = + {-# SCC "fixStgRegisters" #-} + fixStgRegisters cmm + + -- cmm to cmm optimisations + let (opt_cmm, imports) = + {-# SCC "cmmToCmm" #-} + cmmToCmm dflags fixed_cmm + + dumpIfSet_dyn dflags + Opt_D_dump_opt_cmm "Optimised Cmm" + (pprCmm $ Cmm [opt_cmm]) + + -- generate native code from cmm + let ((native, lastMinuteImports), usGen) = + {-# SCC "genMachCode" #-} + initUs us $ genMachCode dflags (cmmTopCodeGen ncgImpl) opt_cmm + + dumpIfSet_dyn dflags + Opt_D_dump_asm_native "Native code" + (vcat $ map (docToSDoc . pprNatCmmTop ncgImpl) native) + + -- tag instructions with register liveness information + let (withLiveness, usLive) = + {-# SCC "regLiveness" #-} + initUs usGen + $ mapUs regLiveness + $ map natCmmTopToLive native + + dumpIfSet_dyn dflags + Opt_D_dump_asm_liveness "Liveness annotations added" + (vcat $ map ppr withLiveness) + + -- allocate registers + (alloced, usAlloc, ppr_raStatsColor, ppr_raStatsLinear) <- + if ( dopt Opt_RegsGraph dflags + || dopt Opt_RegsIterative dflags) + then do + -- the regs usable for allocation + let (alloc_regs :: UniqFM (UniqSet RealReg)) + = foldr (\r -> plusUFM_C unionUniqSets + $ unitUFM (targetClassOfRealReg r) (unitUniqSet r)) + emptyUFM + $ allocatableRegs ncgImpl + + -- do the graph coloring register allocation + let ((alloced, regAllocStats), usAlloc) + = {-# SCC "RegAlloc" #-} + initUs usLive + $ Color.regAlloc + dflags + alloc_regs + (mkUniqSet [0 .. maxSpillSlots ncgImpl]) + withLiveness + + -- dump out what happened during register allocation + dumpIfSet_dyn dflags + Opt_D_dump_asm_regalloc "Registers allocated" + (vcat $ map (docToSDoc . pprNatCmmTop ncgImpl) alloced) + + dumpIfSet_dyn dflags + Opt_D_dump_asm_regalloc_stages "Build/spill stages" + (vcat $ map (\(stage, stats) + -> text "# --------------------------" + $$ text "# cmm " <> int count <> text " Stage " <> int stage + $$ ppr stats) + $ zip [0..] regAllocStats) + + let mPprStats = + if dopt Opt_D_dump_asm_stats dflags + then Just regAllocStats else Nothing + + -- force evaluation of the Maybe to avoid space leak + mPprStats `seq` return () + + return ( alloced, usAlloc + , mPprStats + , Nothing) + + else do + -- do linear register allocation + let ((alloced, regAllocStats), usAlloc) + = {-# SCC "RegAlloc" #-} + initUs usLive + $ liftM unzip + $ mapUs (Linear.regAlloc dflags) withLiveness + + dumpIfSet_dyn dflags + Opt_D_dump_asm_regalloc "Registers allocated" + (vcat $ map (docToSDoc . pprNatCmmTop ncgImpl) alloced) + + let mPprStats = + if dopt Opt_D_dump_asm_stats dflags + then Just (catMaybes regAllocStats) else Nothing + + -- force evaluation of the Maybe to avoid space leak + mPprStats `seq` return () + + return ( alloced, usAlloc + , Nothing + , mPprStats) + + ---- x86fp_kludge. This pass inserts ffree instructions to clear + ---- the FPU stack on x86. The x86 ABI requires that the FPU stack + ---- is clear, and library functions can return odd results if it + ---- isn't. + ---- + ---- NB. must happen before shortcutBranches, because that + ---- generates JXX_GBLs which we can't fix up in x86fp_kludge. + let kludged = {-# SCC "x86fp_kludge" #-} ncg_x86fp_kludge ncgImpl alloced + + ---- generate jump tables + let tabled = + {-# SCC "generateJumpTables" #-} + generateJumpTables ncgImpl kludged + + ---- shortcut branches + let shorted = + {-# SCC "shortcutBranches" #-} + shortcutBranches dflags ncgImpl tabled + + ---- sequence blocks + let sequenced = + {-# SCC "sequenceBlocks" #-} + map (sequenceTop ncgImpl) shorted + + ---- expansion of SPARC synthetic instrs + let expanded = + {-# SCC "sparc_expand" #-} + ncgExpandTop ncgImpl sequenced + + dumpIfSet_dyn dflags + Opt_D_dump_asm_expanded "Synthetic instructions expanded" + (vcat $ map (docToSDoc . pprNatCmmTop ncgImpl) expanded) + + return ( usAlloc + , expanded + , lastMinuteImports ++ imports + , ppr_raStatsColor + , ppr_raStatsLinear) + + +x86fp_kludge :: NatCmmTop X86.Instr.Instr -> NatCmmTop X86.Instr.Instr +x86fp_kludge top@(CmmData _ _) = top +x86fp_kludge (CmmProc info lbl (ListGraph code)) = + CmmProc info lbl (ListGraph $ X86.Instr.i386_insert_ffrees code) + + +-- | Build a doc for all the imports. +-- +makeImportsDoc :: DynFlags -> [CLabel] -> Pretty.Doc +makeImportsDoc dflags imports + = dyld_stubs imports #if HAVE_SUBSECTIONS_VIA_SYMBOLS -- On recent versions of Darwin, the linker supports @@ -191,214 +508,39 @@ nativeCodeGen dflags cmms us -- stack so add the note in: Pretty.$$ Pretty.text ".section .note.GNU-stack,\"\",@progbits" #endif -#if !defined(darwin_TARGET_OS) -- And just because every other compiler does, lets stick in -- an identifier directive: .ident "GHC x.y.z" - Pretty.$$ let compilerIdent = Pretty.text "GHC" Pretty.<+> + Pretty.$$ let compilerIdent = Pretty.text "GHC" Pretty.<+> Pretty.text cProjectVersion in Pretty.text ".ident" Pretty.<+> Pretty.doubleQuotes compilerIdent -#endif - ) - } - where - - add_split (Cmm tops) - | dopt Opt_SplitObjs dflags = split_marker : tops - | otherwise = tops - - split_marker = CmmProc [] mkSplitMarkerLabel [] [] - - -- Generate "symbol stubs" for all external symbols that might - -- come from a dynamic library. -{- dyld_stubs imps = Pretty.vcat $ map pprDyldSymbolStub $ + where + -- Generate "symbol stubs" for all external symbols that might + -- come from a dynamic library. + dyld_stubs :: [CLabel] -> Pretty.Doc +{- dyld_stubs imps = Pretty.vcat $ map pprDyldSymbolStub $ map head $ group $ sort imps-} - + + arch = platformArch $ targetPlatform dflags + os = platformOS $ targetPlatform dflags + -- (Hack) sometimes two Labels pretty-print the same, but have -- different uniques; so we compare their text versions... - dyld_stubs imps - | needImportedSymbols - = Pretty.vcat $ - (pprGotDeclaration :) $ - map (pprImportedSymbol . fst . head) $ - groupBy (\(_,a) (_,b) -> a == b) $ - sortBy (\(_,a) (_,b) -> compare a b) $ - map doPpr $ - imps - | otherwise - = Pretty.empty - - where doPpr lbl = (lbl, Pretty.render $ pprCLabel lbl astyle) - astyle = mkCodeStyle AsmStyle - -#ifndef NCG_DEBUG - my_vcat sds = Pretty.vcat sds -#else - my_vcat sds = Pretty.vcat ( - intersperse ( - Pretty.char ' ' - Pretty.$$ Pretty.ptext SLIT("# ___ncg_debug_marker") - Pretty.$$ Pretty.char ' ' - ) - sds - ) -#endif - - --- Carries output of the code generator passes, for dumping. --- Make sure to only fill the one's we're interested in to avoid --- creating space leaks. - -data CmmNativeGenDump - = CmmNativeGenDump - { cdCmmOpt :: RawCmmTop - , cdNative :: [NatCmmTop] - , cdLiveness :: [LiveCmmTop] - , cdCoalesce :: [LiveCmmTop] - , cdCodeGraphs :: [([LiveCmmTop], Color.Graph Reg RegClass Reg)] - , cdColoredGraph :: Maybe (Color.Graph Reg RegClass Reg) - , cdAlloced :: [NatCmmTop] } - -dchoose dflags opt a b - | dopt opt dflags = a - | otherwise = b - - --- | Complete native code generation phase for a single top-level chunk of Cmm. --- Unless they're being dumped, intermediate data structures are squashed after --- every stage to avoid creating space leaks. --- -cmmNativeGen :: DynFlags -> RawCmmTop -> UniqSM (CmmNativeGenDump, Pretty.Doc, [CLabel]) -cmmNativeGen dflags cmm - = do - -- - fixed_cmm - <- {-# SCC "fixAssigns" #-} - fixAssignsTop cmm - - ---- cmm to cmm optimisations - (cmm, imports, ppr_cmm) - <- (\fixed_cmm - -> {-# SCC "genericOpt" #-} - do let (cmm, imports) = cmmToCmm dflags fixed_cmm - - return ( cmm - , imports - , dchoose dflags Opt_D_dump_cmm cmm (CmmData Text [])) - ) fixed_cmm - - - ---- generate native code from cmm - (native, lastMinuteImports, ppr_native) - <- (\cmm - -> {-# SCC "genMachCode" #-} - do (machCode, lastMinuteImports) - <- genMachCode dflags cmm - - return ( machCode - , lastMinuteImports - , dchoose dflags Opt_D_dump_asm_native machCode []) - ) cmm - - - ---- tag instructions with register liveness information - (withLiveness, ppr_withLiveness) - <- (\native - -> {-# SCC "regLiveness" #-} - do - withLiveness <- mapUs regLiveness native - - return ( withLiveness - , dchoose dflags Opt_D_dump_asm_liveness withLiveness [])) - native - - ---- allocate registers - (alloced, ppr_alloced, ppr_coalesce, ppr_codeGraphs, ppr_coloredGraph) - <- (\withLiveness - -> {-# SCC "regAlloc" #-} - do - if dopt Opt_RegsGraph dflags - then do - -- the regs usable for allocation - let alloc_regs - = foldr (\r -> plusUFM_C unionUniqSets - $ unitUFM (regClass r) (unitUniqSet r)) - emptyUFM - $ map RealReg allocatableRegs - - -- aggressively coalesce moves between virtual regs - coalesced <- regCoalesce withLiveness - - -- graph coloring register allocation - (alloced, codeGraphs) - <- Color.regAlloc - alloc_regs - (mkUniqSet [0..maxSpillSlots]) - coalesced - - return ( alloced - , dchoose dflags Opt_D_dump_asm_regalloc alloced [] - , dchoose dflags Opt_D_dump_asm_coalesce coalesced [] - , dchoose dflags Opt_D_dump_asm_regalloc_stages codeGraphs [] - , dchoose dflags Opt_D_dump_asm_conflicts Nothing Nothing) - - else do - -- do linear register allocation - alloced <- mapUs regAlloc withLiveness - return ( alloced - , dchoose dflags Opt_D_dump_asm_regalloc alloced [] - , [] - , [] - , Nothing )) - withLiveness - - - ---- shortcut branches - let shorted = - {-# SCC "shortcutBranches" #-} - shortcutBranches dflags alloced - - ---- sequence blocks - let sequenced = - {-# SCC "sequenceBlocks" #-} - map sequenceTop shorted - - ---- x86fp_kludge - let final_mach_code = -#if i386_TARGET_ARCH - {-# SCC "x86fp_kludge" #-} - map x86fp_kludge sequenced -#else - sequenced -#endif - - ---- vcat - let final_sdoc = - {-# SCC "vcat" #-} - Pretty.vcat (map pprNatCmmTop final_mach_code) - - let dump = - CmmNativeGenDump - { cdCmmOpt = ppr_cmm - , cdNative = ppr_native - , cdLiveness = ppr_withLiveness - , cdCoalesce = ppr_coalesce - , cdCodeGraphs = ppr_codeGraphs - , cdColoredGraph = ppr_coloredGraph - , cdAlloced = ppr_alloced } - - returnUs (dump, final_sdoc Pretty.$$ Pretty.text "", lastMinuteImports ++ imports) - -#if i386_TARGET_ARCH -x86fp_kludge :: NatCmmTop -> NatCmmTop -x86fp_kludge top@(CmmData _ _) = top -x86fp_kludge top@(CmmProc info lbl params code) = - CmmProc info lbl params (map bb_i386_insert_ffrees code) - where - bb_i386_insert_ffrees (BasicBlock id instrs) = - BasicBlock id (i386_insert_ffrees instrs) -#endif + dyld_stubs imps + | needImportedSymbols arch os + = Pretty.vcat $ + (pprGotDeclaration arch os :) $ + map ( pprImportedSymbol arch os . fst . head) $ + groupBy (\(_,a) (_,b) -> a == b) $ + sortBy (\(_,a) (_,b) -> compare a b) $ + map doPpr $ + imps + | otherwise + = Pretty.empty + + doPpr lbl = (lbl, renderWithStyle (pprCLabel lbl) astyle) + astyle = mkCodeStyle AsmStyle -- ----------------------------------------------------------------------------- @@ -410,10 +552,13 @@ x86fp_kludge top@(CmmProc info lbl params code) = -- such that as many of the local jumps as possible turn into -- fallthroughs. -sequenceTop :: NatCmmTop -> NatCmmTop -sequenceTop top@(CmmData _ _) = top -sequenceTop (CmmProc info lbl params blocks) = - CmmProc info lbl params (makeFarBranches $ sequenceBlocks blocks) +sequenceTop + :: Instruction instr + => NcgImpl instr jumpDest -> NatCmmTop instr -> NatCmmTop instr + +sequenceTop _ top@(CmmData _ _) = top +sequenceTop ncgImpl (CmmProc info lbl (ListGraph blocks)) = + CmmProc info lbl (ListGraph $ ncgMakeFarBranches ncgImpl $ sequenceBlocks blocks) -- The algorithm is very simple (and stupid): we make a graph out of -- the blocks where there is an edge from one block to another iff the @@ -422,24 +567,46 @@ sequenceTop (CmmProc info lbl params blocks) = -- output the block, then if it has an out edge, we move the -- destination of the out edge to the front of the list, and continue. -sequenceBlocks :: [NatBasicBlock] -> [NatBasicBlock] +-- FYI, the classic layout for basic blocks uses postorder DFS; this +-- algorithm is implemented in Hoopl. + +sequenceBlocks + :: Instruction instr + => [NatBasicBlock instr] + -> [NatBasicBlock instr] + sequenceBlocks [] = [] sequenceBlocks (entry:blocks) = seqBlocks (mkNode entry : reverse (flattenSCCs (sccBlocks blocks))) -- the first block is the entry point ==> it must remain at the start. -sccBlocks :: [NatBasicBlock] -> [SCC (NatBasicBlock,Unique,[Unique])] -sccBlocks blocks = stronglyConnCompR (map mkNode blocks) -getOutEdges :: [Instr] -> [Unique] -getOutEdges instrs = case jumpDests (last instrs) [] of - [one] -> [getUnique one] - _many -> [] - -- we're only interested in the last instruction of - -- the block, and only if it has a single destination. +sccBlocks + :: Instruction instr + => [NatBasicBlock instr] + -> [SCC ( NatBasicBlock instr + , Unique + , [Unique])] + +sccBlocks blocks = stronglyConnCompFromEdgedVerticesR (map mkNode blocks) + +-- we're only interested in the last instruction of +-- the block, and only if it has a single destination. +getOutEdges + :: Instruction instr + => [instr] -> [Unique] +getOutEdges instrs + = case jumpDestsOfInstr (last instrs) of + [one] -> [getUnique one] + _many -> [] + +mkNode :: (Instruction t) + => GenBasicBlock t + -> (GenBasicBlock t, Unique, [Unique]) mkNode block@(BasicBlock id instrs) = (block, getUnique id, getOutEdges instrs) +seqBlocks :: (Eq t) => [(GenBasicBlock t1, t, [t])] -> [GenBasicBlock t1] seqBlocks [] = [] seqBlocks ((block,_,[]) : rest) = block : seqBlocks rest @@ -452,7 +619,8 @@ seqBlocks ((block@(BasicBlock id instrs),_,[next]) : rest) -- fallthroughs within a loop. seqBlocks _ = panic "AsmCodegen:seqBlocks" -reorder id accum [] = (False, reverse accum) +reorder :: (Eq a) => a -> [(t, a, t1)] -> [(t, a, t1)] -> (Bool, [(t, a, t1)]) +reorder _ accum [] = (False, reverse accum) reorder id accum (b@(block,id',out) : rest) | id == id' = (True, (block,id,out) : reverse accum ++ rest) | otherwise = reorder id (b:accum) rest @@ -464,9 +632,9 @@ reorder id accum (b@(block,id',out) : rest) -- Conditional branches on PowerPC are limited to +-32KB; if our Procs get too -- big, we have to work around this limitation. -makeFarBranches :: [NatBasicBlock] -> [NatBasicBlock] - -#if powerpc_TARGET_ARCH +makeFarBranches + :: [NatBasicBlock PPC.Instr.Instr] + -> [NatBasicBlock PPC.Instr.Instr] makeFarBranches blocks | last blockAddresses < nearLimit = blocks | otherwise = zipWith handleBlock blockAddresses blocks @@ -477,14 +645,14 @@ makeFarBranches blocks handleBlock addr (BasicBlock id instrs) = BasicBlock id (zipWith makeFar [addr..] instrs) - makeFar addr (BCC ALWAYS tgt) = BCC ALWAYS tgt - makeFar addr (BCC cond tgt) + makeFar _ (PPC.Instr.BCC PPC.Cond.ALWAYS tgt) = PPC.Instr.BCC PPC.Cond.ALWAYS tgt + makeFar addr (PPC.Instr.BCC cond tgt) | abs (addr - targetAddr) >= nearLimit - = BCCFAR cond tgt + = PPC.Instr.BCCFAR cond tgt | otherwise - = BCC cond tgt + = PPC.Instr.BCC cond tgt where Just targetAddr = lookupUFM blockAddressMap tgt - makeFar addr other = other + makeFar _ other = other nearLimit = 7000 -- 8192 instructions are allowed; let's keep some -- distance, as we have a few pseudo-insns that are @@ -493,49 +661,79 @@ makeFarBranches blocks -- things exactly blockAddressMap = listToUFM $ zip (map blockId blocks) blockAddresses -#else -makeFarBranches = id -#endif + +-- ----------------------------------------------------------------------------- +-- Generate jump tables + +-- Analyzes all native code and generates data sections for all jump +-- table instructions. +generateJumpTables + :: NcgImpl instr jumpDest + -> [NatCmmTop instr] -> [NatCmmTop instr] +generateJumpTables ncgImpl xs = concatMap f xs + where f p@(CmmProc _ _ (ListGraph xs)) = p : concatMap g xs + f p = [p] + g (BasicBlock _ xs) = catMaybes (map (generateJumpTableForInstr ncgImpl) xs) -- ----------------------------------------------------------------------------- -- Shortcut branches -shortcutBranches :: DynFlags -> [NatCmmTop] -> [NatCmmTop] -shortcutBranches dflags tops +shortcutBranches + :: DynFlags + -> NcgImpl instr jumpDest + -> [NatCmmTop instr] + -> [NatCmmTop instr] + +shortcutBranches dflags ncgImpl tops | optLevel dflags < 1 = tops -- only with -O or higher - | otherwise = map (apply_mapping mapping) tops' + | otherwise = map (apply_mapping ncgImpl mapping) tops' where - (tops', mappings) = mapAndUnzip build_mapping tops + (tops', mappings) = mapAndUnzip (build_mapping ncgImpl) tops mapping = foldr plusUFM emptyUFM mappings -build_mapping top@(CmmData _ _) = (top, emptyUFM) -build_mapping (CmmProc info lbl params []) - = (CmmProc info lbl params [], emptyUFM) -build_mapping (CmmProc info lbl params (head:blocks)) - = (CmmProc info lbl params (head:others), mapping) +build_mapping :: NcgImpl instr jumpDest + -> GenCmmTop d t (ListGraph instr) + -> (GenCmmTop d t (ListGraph instr), UniqFM jumpDest) +build_mapping _ top@(CmmData _ _) = (top, emptyUFM) +build_mapping _ (CmmProc info lbl (ListGraph [])) + = (CmmProc info lbl (ListGraph []), emptyUFM) +build_mapping ncgImpl (CmmProc info lbl (ListGraph (head:blocks))) + = (CmmProc info lbl (ListGraph (head:others)), mapping) -- drop the shorted blocks, but don't ever drop the first one, -- because it is pointed to by a global label. where -- find all the blocks that just consist of a jump that can be -- shorted. - (shortcut_blocks, others) = partitionWith split blocks - split (BasicBlock id [insn]) | Just dest <- canShortcut insn - = Left (id,dest) - split other = Right other + -- Don't completely eliminate loops here -- that can leave a dangling jump! + (_, shortcut_blocks, others) = foldl split (emptyBlockSet, [], []) blocks + split (s, shortcut_blocks, others) b@(BasicBlock id [insn]) + | Just jd <- canShortcut ncgImpl insn, + Just dest <- getJumpDestBlockId ncgImpl jd, + (setMember dest s) || dest == id -- loop checks + = (s, shortcut_blocks, b : others) + split (s, shortcut_blocks, others) (BasicBlock id [insn]) + | Just dest <- canShortcut ncgImpl insn + = (setInsert id s, (id,dest) : shortcut_blocks, others) + split (s, shortcut_blocks, others) other = (s, shortcut_blocks, other : others) + -- build a mapping from BlockId to JumpDest for shorting branches mapping = foldl add emptyUFM shortcut_blocks add ufm (id,dest) = addToUFM ufm id dest -apply_mapping ufm (CmmData sec statics) - = CmmData sec (map (shortcutStatic (lookupUFM ufm)) statics) +apply_mapping :: NcgImpl instr jumpDest + -> UniqFM jumpDest + -> GenCmmTop CmmStatic h (ListGraph instr) + -> GenCmmTop CmmStatic h (ListGraph instr) +apply_mapping ncgImpl ufm (CmmData sec statics) + = CmmData sec (map (shortcutStatic ncgImpl (lookupUFM ufm)) statics) -- we need to get the jump tables, so apply the mapping to the entries -- of a CmmData too. -apply_mapping ufm (CmmProc info lbl params blocks) - = CmmProc info lbl params (map short_bb blocks) +apply_mapping ncgImpl ufm (CmmProc info lbl (ListGraph blocks)) + = CmmProc info lbl (ListGraph $ map short_bb blocks) where short_bb (BasicBlock id insns) = BasicBlock id $! map short_insn insns - short_insn i = shortcutJump (lookupUFM ufm) i + short_insn i = shortcutJump ncgImpl (lookupUFM ufm) i -- shortcutJump should apply the mapping repeatedly, -- just in case we can short multiple branches. @@ -559,9 +757,15 @@ apply_mapping ufm (CmmProc info lbl params blocks) -- Switching between the two monads whilst carrying along the same -- Unique supply breaks abstraction. Is that bad? -genMachCode :: DynFlags -> RawCmmTop -> UniqSM ([NatCmmTop], [CLabel]) +genMachCode + :: DynFlags + -> (RawCmmTop -> NatM [NatCmmTop instr]) + -> RawCmmTop + -> UniqSM + ( [NatCmmTop instr] + , [CLabel]) -genMachCode dflags cmm_top +genMachCode dflags cmmTopCodeGen cmm_top = do { initial_us <- getUs ; let initial_st = mkNatM_State initial_us 0 dflags (new_tops, final_st) = initNat initial_st (cmmTopCodeGen cmm_top) @@ -573,45 +777,6 @@ genMachCode dflags cmm_top } -- ----------------------------------------------------------------------------- --- Fixup assignments to global registers so that they assign to --- locations within the RegTable, if appropriate. - --- Note that we currently don't fixup reads here: they're done by --- the generic optimiser below, to avoid having two separate passes --- over the Cmm. - -fixAssignsTop :: RawCmmTop -> UniqSM RawCmmTop -fixAssignsTop top@(CmmData _ _) = returnUs top -fixAssignsTop (CmmProc info lbl params blocks) = - mapUs fixAssignsBlock blocks `thenUs` \ blocks' -> - returnUs (CmmProc info lbl params blocks') - -fixAssignsBlock :: CmmBasicBlock -> UniqSM CmmBasicBlock -fixAssignsBlock (BasicBlock id stmts) = - fixAssigns stmts `thenUs` \ stmts' -> - returnUs (BasicBlock id stmts') - -fixAssigns :: [CmmStmt] -> UniqSM [CmmStmt] -fixAssigns stmts = - mapUs fixAssign stmts `thenUs` \ stmtss -> - returnUs (concat stmtss) - -fixAssign :: CmmStmt -> UniqSM [CmmStmt] -fixAssign (CmmAssign (CmmGlobal reg) src) - | Left realreg <- reg_or_addr - = returnUs [CmmAssign (CmmGlobal reg) src] - | Right baseRegAddr <- reg_or_addr - = returnUs [CmmStore baseRegAddr src] - -- Replace register leaves with appropriate StixTrees for - -- the given target. GlobalRegs which map to a reg on this - -- arch are left unchanged. Assigning to BaseReg is always - -- illegal, so we check for that. - where - reg_or_addr = get_GlobalReg_reg_or_addr reg - -fixAssign other_stmt = returnUs [other_stmt] - --- ----------------------------------------------------------------------------- -- Generic Cmm optimiser {- @@ -620,18 +785,14 @@ Here we do: (a) Constant folding (b) Simple inlining: a temporary which is assigned to and then used, once, can be shorted. - (c) Replacement of references to GlobalRegs which do not have - machine registers by the appropriate memory load (eg. - Hp ==> *(BaseReg + 34) ). - (d) Position independent code and dynamic linking + (c) Position independent code and dynamic linking (i) introduce the appropriate indirections and position independent refs (ii) compile a list of imported symbols -Ideas for other things we could do (ToDo): +Ideas for other things we could do: - shortcut jumps-to-jumps - - eliminate dead code blocks - simple CSE: if an expr is assigned to a temp, then replace later occs of that expr with the temp, until the expr is no longer valid (can push through temp assignments, and certain assigns to mem...) @@ -639,9 +800,9 @@ Ideas for other things we could do (ToDo): cmmToCmm :: DynFlags -> RawCmmTop -> (RawCmmTop, [CLabel]) cmmToCmm _ top@(CmmData _ _) = (top, []) -cmmToCmm dflags (CmmProc info lbl params blocks) = runCmmOpt dflags $ do - blocks' <- mapM cmmBlockConFold (cmmMiniInline blocks) - return $ CmmProc info lbl params blocks' +cmmToCmm dflags (CmmProc info lbl (ListGraph blocks)) = runCmmOpt dflags $ do + blocks' <- mapM cmmBlockConFold (cmmMiniInline (cmmEliminateDeadBlocks blocks)) + return $ CmmProc info lbl (ListGraph blocks') newtype CmmOptM a = CmmOptM (([CLabel], DynFlags) -> (# a, [CLabel] #)) @@ -655,7 +816,7 @@ instance Monad CmmOptM where CmmOptM g' -> g' (imports', dflags) addImportCmmOpt :: CLabel -> CmmOptM () -addImportCmmOpt lbl = CmmOptM $ \(imports, dflags) -> (# (), lbl:imports #) +addImportCmmOpt lbl = CmmOptM $ \(imports, _dflags) -> (# (), lbl:imports #) getDynFlagsCmmOpt :: CmmOptM DynFlags getDynFlagsCmmOpt = CmmOptM $ \(imports, dflags) -> (# dflags, imports #) @@ -669,6 +830,7 @@ cmmBlockConFold (BasicBlock id stmts) = do stmts' <- mapM cmmStmtConFold stmts return $ BasicBlock id stmts' +cmmStmtConFold :: CmmStmt -> CmmOptM CmmStmt cmmStmtConFold stmt = case stmt of CmmAssign reg src @@ -692,9 +854,9 @@ cmmStmtConFold stmt e' <- cmmExprConFold CallReference e return $ CmmCallee e' conv other -> return other - args' <- mapM (\(arg, hint) -> do + args' <- mapM (\(CmmHinted arg hint) -> do arg' <- cmmExprConFold DataReference arg - return (arg', hint)) args + return (CmmHinted arg' hint)) args return $ CmmCall target' regs args' srt returns CmmCondBranch test dest @@ -704,8 +866,8 @@ cmmStmtConFold stmt CmmComment (mkFastString ("deleted: " ++ showSDoc (pprStmt stmt))) - CmmLit (CmmInt n _) -> CmmBranch dest - other -> CmmCondBranch test' dest + CmmLit (CmmInt _ _) -> CmmBranch dest + _other -> CmmCondBranch test' dest CmmSwitch expr ids -> do expr' <- cmmExprConFold DataReference expr @@ -715,8 +877,11 @@ cmmStmtConFold stmt -> return other -cmmExprConFold referenceKind expr - = case expr of +cmmExprConFold :: ReferenceKind -> CmmExpr -> CmmOptM CmmExpr +cmmExprConFold referenceKind expr = do + dflags <- getDynFlagsCmmOpt + let arch = platformArch (targetPlatform dflags) + case expr of CmmLoad addr rep -> do addr' <- cmmExprConFold DataReference addr return $ CmmLoad addr' rep @@ -729,67 +894,33 @@ cmmExprConFold referenceKind expr CmmLit (CmmLabel lbl) -> do - dflags <- getDynFlagsCmmOpt cmmMakeDynamicReference dflags addImportCmmOpt referenceKind lbl CmmLit (CmmLabelOff lbl off) -> do - dflags <- getDynFlagsCmmOpt dynRef <- cmmMakeDynamicReference dflags addImportCmmOpt referenceKind lbl - return $ cmmMachOpFold (MO_Add wordRep) [ + return $ cmmMachOpFold (MO_Add wordWidth) [ dynRef, - (CmmLit $ CmmInt (fromIntegral off) wordRep) + (CmmLit $ CmmInt (fromIntegral off) wordWidth) ] -#if powerpc_TARGET_ARCH - -- On powerpc (non-PIC), it's easier to jump directly to a label than - -- to use the register table, so we replace these registers - -- with the corresponding labels: + -- On powerpc (non-PIC), it's easier to jump directly to a label than + -- to use the register table, so we replace these registers + -- with the corresponding labels: + CmmReg (CmmGlobal EagerBlackholeInfo) + | arch == ArchPPC && not opt_PIC + -> cmmExprConFold referenceKind $ + CmmLit (CmmLabel (mkCmmCodeLabel rtsPackageId (fsLit "__stg_EAGER_BLACKHOLE_info"))) CmmReg (CmmGlobal GCEnter1) - | not opt_PIC + | arch == ArchPPC && not opt_PIC -> cmmExprConFold referenceKind $ - CmmLit (CmmLabel (mkRtsCodeLabel SLIT( "__stg_gc_enter_1"))) + CmmLit (CmmLabel (mkCmmCodeLabel rtsPackageId (fsLit "__stg_gc_enter_1"))) CmmReg (CmmGlobal GCFun) - | not opt_PIC + | arch == ArchPPC && not opt_PIC -> cmmExprConFold referenceKind $ - CmmLit (CmmLabel (mkRtsCodeLabel SLIT( "__stg_gc_fun"))) -#endif + CmmLit (CmmLabel (mkCmmCodeLabel rtsPackageId (fsLit "__stg_gc_fun"))) - CmmReg (CmmGlobal mid) - -- Replace register leaves with appropriate StixTrees for - -- the given target. MagicIds which map to a reg on this - -- arch are left unchanged. For the rest, BaseReg is taken - -- to mean the address of the reg table in MainCapability, - -- and for all others we generate an indirection to its - -- location in the register table. - -> case get_GlobalReg_reg_or_addr mid of - Left realreg -> return expr - Right baseRegAddr - -> case mid of - BaseReg -> cmmExprConFold DataReference baseRegAddr - other -> cmmExprConFold DataReference - (CmmLoad baseRegAddr (globalRegRep mid)) - -- eliminate zero offsets - CmmRegOff reg 0 - -> cmmExprConFold referenceKind (CmmReg reg) - - CmmRegOff (CmmGlobal mid) offset - -- RegOf leaves are just a shorthand form. If the reg maps - -- to a real reg, we keep the shorthand, otherwise, we just - -- expand it and defer to the above code. - -> case get_GlobalReg_reg_or_addr mid of - Left realreg -> return expr - Right baseRegAddr - -> cmmExprConFold DataReference (CmmMachOp (MO_Add wordRep) [ - CmmReg (CmmGlobal mid), - CmmLit (CmmInt (fromIntegral offset) - wordRep)]) other -> return other --- ----------------------------------------------------------------------------- --- Utils - -bind f x = x $! f - \end{code}