X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fcmm%2FMkZipCfgCmm.hs;h=4b073e2abffbcf32e8925dfe4c53bb86fd1ff595;hb=e6243a818496aad82b6f47511d3bd9bc800f747d;hp=6ddec3d28deb57465791ed4e330a60d49d839a37;hpb=569348e87434f2a8d9e18dccac8b4a563b4eb363;p=ghc-hetmet.git diff --git a/compiler/cmm/MkZipCfgCmm.hs b/compiler/cmm/MkZipCfgCmm.hs index 6ddec3d..4b073e2 100644 --- a/compiler/cmm/MkZipCfgCmm.hs +++ b/compiler/cmm/MkZipCfgCmm.hs @@ -6,31 +6,38 @@ -- complain to Norman Ramsey. module MkZipCfgCmm - ( mkNop, mkAssign, mkStore, mkCall, mkUnsafeCall, mkFinalCall - , mkJump, mkCbranch, mkSwitch, mkReturn, mkComment, mkCmmIfThenElse - , mkCmmWhileDo - , (<*>), mkLabel, mkBranch + ( mkNop, mkAssign, mkStore, mkCall, mkCmmCall, mkSafeCall, mkUnsafeCall, mkFinalCall + , mkJump, mkForeignJump, mkJumpGC, mkCbranch, mkSwitch, mkReturn + , mkReturnSimple, mkComment, copyIn, copyOut + , mkEntry, mkCmmIfThenElse, mkCmmIfThen, mkCmmWhileDo + , (<*>), catAGraphs, mkLabel, mkBranch , emptyAGraph, withFreshLabel, withUnique, outOfLine , lgraphOfAGraph, graphOfAGraph, labelAGraph - , CmmZ, CmmTopZ, CmmGraph, CmmBlock, CmmAGraph, Middle, Last, Convention(..) + , CmmZ, CmmTopZ, CmmGraph, CmmBlock, CmmAGraph + , Middle, Last, Convention(..), ForeignConvention(..), MidCallTarget(..), Transfer(..) + , emptyStackInfo, stackStubExpr, pprAGraph ) where #include "HsVersions.h" +import BlockId import CmmExpr import Cmm ( GenCmm(..), GenCmmTop(..), CmmStatic, CmmInfo - , CmmCallTarget(..), CmmActuals, CmmFormals + , CmmActuals, CmmFormals ) +import CmmCallConv (assignArgumentsPos, ParamLocation(..)) import ZipCfgCmmRep hiding (CmmGraph, CmmAGraph, CmmBlock, CmmZ, CmmTopZ) - -- ^ to make this module more self-contained, these definitions are duplicated below + -- to make this module more self-contained, the above definitions are + -- duplicated below import PprCmm() -import ClosureInfo import FastString import ForeignCall -import ZipCfg import MkZipCfg +import Panic +import StaticFlags +import ZipCfg type CmmGraph = LGraph Middle Last type CmmAGraph = AGraph Middle Last @@ -38,56 +45,175 @@ type CmmBlock = Block Middle Last type CmmZ = GenCmm CmmStatic CmmInfo CmmGraph type CmmTopZ = GenCmmTop CmmStatic CmmInfo CmmGraph +data Transfer = Call | Jump | Ret deriving Eq + +---------- No-ops mkNop :: CmmAGraph +mkComment :: FastString -> CmmAGraph + +---------- Assignment and store mkAssign :: CmmReg -> CmmExpr -> CmmAGraph mkStore :: CmmExpr -> CmmExpr -> CmmAGraph -mkCall :: CmmExpr -> CCallConv -> CmmFormals -> CmmActuals -> C_SRT -> CmmAGraph -mkUnsafeCall :: CmmCallTarget -> CmmFormals -> CmmActuals -> CmmAGraph -mkFinalCall :: CmmExpr -> CCallConv -> CmmActuals -> CmmAGraph -- never returns -mkJump :: CmmExpr -> CmmActuals -> CmmAGraph -mkCbranch :: CmmExpr -> BlockId -> BlockId -> CmmAGraph -mkSwitch :: CmmExpr -> [Maybe BlockId] -> CmmAGraph -mkReturn :: CmmActuals -> CmmAGraph -mkComment :: FastString -> CmmAGraph --- Not to be forgotten, but exported by MkZipCfg: ---mkBranch :: BlockId -> CmmAGraph ---mkLabel :: BlockId -> CmmAGraph +---------- Calls +mkCall :: CmmExpr -> Convention -> CmmFormals -> CmmActuals -> + UpdFrameOffset -> CmmAGraph +mkCmmCall :: CmmExpr -> CmmFormals -> CmmActuals -> + UpdFrameOffset -> CmmAGraph + -- Native C-- calling convention +mkSafeCall :: MidCallTarget -> CmmFormals -> CmmActuals -> UpdFrameOffset -> CmmAGraph +mkUnsafeCall :: MidCallTarget -> CmmFormals -> CmmActuals -> CmmAGraph +mkFinalCall :: CmmExpr -> CCallConv -> CmmActuals -> UpdFrameOffset -> CmmAGraph + -- Never returns; like exit() or barf() + +---------- Control transfer +mkJump :: CmmExpr -> CmmActuals -> UpdFrameOffset -> CmmAGraph +mkJumpGC :: CmmExpr -> CmmActuals -> UpdFrameOffset -> CmmAGraph +mkForeignJump :: Convention -> CmmExpr -> CmmActuals -> UpdFrameOffset -> CmmAGraph +mkCbranch :: CmmExpr -> BlockId -> BlockId -> CmmAGraph +mkSwitch :: CmmExpr -> [Maybe BlockId] -> CmmAGraph +mkReturn :: CmmExpr -> CmmActuals -> UpdFrameOffset -> CmmAGraph +mkReturnSimple :: CmmActuals -> UpdFrameOffset -> CmmAGraph + mkCmmIfThenElse :: CmmExpr -> CmmAGraph -> CmmAGraph -> CmmAGraph -mkCmmWhileDo :: CmmExpr -> CmmAGraph -> CmmAGraph +mkCmmIfThen :: CmmExpr -> CmmAGraph -> CmmAGraph +mkCmmWhileDo :: CmmExpr -> CmmAGraph -> CmmAGraph + +-- Not to be forgotten, but exported by MkZipCfg: +-- mkBranch :: BlockId -> CmmAGraph +-- mkLabel :: BlockId -> Maybe Int -> CmmAGraph +-- outOfLine :: CmmAGraph -> CmmAGraph +-- withUnique :: (Unique -> CmmAGraph) -> CmmAGraph +-- withFreshLabel :: String -> (BlockId -> CmmAGraph) -> CmmAGraph -------------------------------------------------------------------------- +mkCmmWhileDo e = mkWhileDo (mkCbranch e) mkCmmIfThenElse e = mkIfThenElse (mkCbranch e) -mkCmmWhileDo e = mkWhileDo (mkCbranch e) + +mkCmmIfThen e tbranch + = withFreshLabel "end of if" $ \endif -> + withFreshLabel "start of then" $ \tid -> + mkCbranch e tid endif <*> + mkLabel tid emptyStackInfo <*> tbranch <*> mkBranch endif <*> + mkLabel endif emptyStackInfo + -- ================ IMPLEMENTATION ================-- -mkNop = mkMiddle $ MidNop +mkNop = emptyAGraph mkComment fs = mkMiddle $ MidComment fs -mkAssign l r = mkMiddle $ MidAssign l r mkStore l r = mkMiddle $ MidStore l r -mkCbranch pred ifso ifnot = mkLast $ LastCondBranch pred ifso ifnot -mkSwitch e tbl = mkLast $ LastSwitch e tbl - -mkUnsafeCall tgt results actuals = mkMiddle $ MidUnsafeCall tgt results actuals - -cmmArgConv, cmmResConv :: Convention -cmmArgConv = ConventionStandard CmmCallConv Arguments -cmmResConv = ConventionStandard CmmCallConv Arguments - -mkJump e actuals = mkMiddle (CopyOut cmmArgConv actuals) <*> mkLast (LastJump e) -mkReturn actuals = mkMiddle (CopyOut cmmResConv actuals) <*> mkLast LastReturn - -mkFinalCall f conv actuals = - mkMiddle (CopyOut (ConventionStandard conv Arguments) actuals) <*> - mkLast (LastCall f Nothing) - -mkCall f conv results actuals srt = - withFreshLabel "call successor" $ \k -> - mkMiddle (CopyOut (ConventionStandard conv Arguments) actuals) <*> - mkLast (LastCall f (Just k)) <*> - mkLabel k <*> - mkMiddle (CopyIn (ConventionStandard conv Results) results srt) +-- NEED A COMPILER-DEBUGGING FLAG HERE +-- Sanity check: any value assigned to a pointer must be non-zero. +-- If it's 0, cause a crash immediately. +mkAssign l r = if opt_StubDeadValues then assign l r <*> check l else assign l r + where assign l r = mkMiddle (MidAssign l r) + check (CmmGlobal _) = mkNop + check l@(CmmLocal reg) = -- if a ptr arg is NULL, cause a crash! + if isGcPtrType ty then + mkCmmIfThen (CmmMachOp (MO_Eq w) [r, stackStubExpr w]) + (assign l (CmmLoad (CmmLit (CmmInt 0 w)) ty)) + else mkNop + where ty = localRegType reg + w = typeWidth ty + r = CmmReg l + + +-- Why are we inserting extra blocks that simply branch to the successors? +-- Because in addition to the branch instruction, @mkBranch@ will insert +-- a necessary adjustment to the stack pointer. +mkCbranch pred ifso ifnot = mkLast (LastCondBranch pred ifso ifnot) +mkSwitch e tbl = mkLast $ LastSwitch e tbl + +mkSafeCall t fs as upd = + withFreshLabel "safe call" $ \k -> + mkMiddle $ MidForeignCall (Safe k upd) t fs as +mkUnsafeCall t fs as = mkMiddle $ MidForeignCall Unsafe t fs as + +-- For debugging purposes, we can stub out dead stack slots: +stackStubExpr :: Width -> CmmExpr +stackStubExpr w = CmmLit (CmmInt 0 w) + +-- Return the number of bytes used for copying arguments, as well as the +-- instructions to copy the arguments. +copyIn :: Convention -> Bool -> Area -> CmmFormals -> (Int, AGraph Middle Last) +copyIn conv isCall area formals = + foldr ci (init_offset, mkNop) $ assignArgumentsPos conv isCall localRegType formals + where ci (reg, RegisterParam r) (n, ms) = + (n, mkAssign (CmmLocal reg) (CmmReg $ CmmGlobal r) <*> ms) + ci (reg, StackParam off) (n, ms) = + let ty = localRegType reg + off' = off + init_offset + in (max n off', + mkAssign (CmmLocal reg) (CmmLoad (CmmStackSlot area off') ty) <*> ms) + init_offset = widthInBytes wordWidth + +-- The argument layout function ignores the pointer to the info table, so we slot that +-- in here. When copying-out to a young area, we set the info table for return +-- and adjust the offsets of the other parameters. +-- If this is a call instruction, we adjust the offsets of the other parameters. +copyOut :: Convention -> Transfer -> Area -> CmmActuals -> UpdFrameOffset -> (Int, [Middle]) +copyOut conv transfer area@(CallArea a) actuals updfr_off = + foldr co (init_offset, []) args' + where args = assignArgumentsPos conv skip_node cmmExprType actuals + skip_node = transfer /= Ret + (setRA, init_offset) = + case a of Young id@(BlockId _) -> -- set RA if making a call + if transfer == Call then + ([(CmmLit (CmmBlock id), StackParam init_offset)], ra_width) + else ([], 0) + Old -> ([], updfr_off) + ra_width = widthInBytes wordWidth + args' = foldl adjust setRA args + where adjust rst (v, StackParam off) = (v, StackParam (off + init_offset)) : rst + adjust rst x@(_, RegisterParam _) = x : rst + co (v, RegisterParam r) (n, ms) = (n, MidAssign (CmmGlobal r) v : ms) + co (v, StackParam off) (n, ms) = + (max n off, MidStore (CmmStackSlot area off) v : ms) +copyOut _ _ (RegSlot _) _ _ = panic "cannot copy arguments into a register slot" + +mkEntry :: BlockId -> Convention -> CmmFormals -> (Int, CmmAGraph) +mkEntry _ conv formals = copyIn conv False (CallArea Old) formals + +lastWithArgs :: Transfer -> Area -> Convention -> CmmActuals -> UpdFrameOffset -> + (Int -> Last) -> CmmAGraph +lastWithArgs transfer area conv actuals updfr_off last = + let (outArgs, copies) = copyOut conv transfer area actuals updfr_off in + mkMiddles copies <*> mkLast (last outArgs) + +-- The area created for the jump and return arguments is the same area as the +-- procedure entry. +old :: Area +old = CallArea Old +toCall :: CmmExpr -> Maybe BlockId -> UpdFrameOffset -> Int -> Last +toCall e cont updfr_off arg_space = LastCall e cont arg_space (Just updfr_off) +mkJump e actuals updfr_off = + lastWithArgs Jump old Native actuals updfr_off $ toCall e Nothing updfr_off +mkJumpGC e actuals updfr_off = + lastWithArgs Jump old GC actuals updfr_off $ toCall e Nothing updfr_off +mkForeignJump conv e actuals updfr_off = + lastWithArgs Jump old conv actuals updfr_off $ toCall e Nothing updfr_off +mkReturn e actuals updfr_off = + lastWithArgs Ret old Native actuals updfr_off $ toCall e Nothing updfr_off + -- where e = CmmLoad (CmmStackSlot (CallArea Old) updfr_off) gcWord +mkReturnSimple actuals updfr_off = + lastWithArgs Ret old Native actuals updfr_off $ toCall e Nothing updfr_off + where e = CmmLoad (CmmStackSlot (CallArea Old) updfr_off) gcWord + +mkFinalCall f _ actuals updfr_off = + lastWithArgs Call old Native actuals updfr_off $ toCall f Nothing updfr_off + +mkCmmCall f results actuals = mkCall f Native results actuals + +-- I'm dropping the SRT, but that should be okay: we plan to reconstruct it later. +mkCall f conv results actuals updfr_off = + withFreshLabel "call successor" $ \k -> + let area = CallArea $ Young k + (off, copyin) = copyIn conv False area results + copyout = lastWithArgs Call area conv actuals updfr_off + (toCall f (Just k) updfr_off) + in (copyout <*> mkLabel k (StackInfo (Just off) (Just updfr_off)) + <*> copyin)