X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2FMkZipCfgCmm.hs;h=1d806508586dfc2caf194ef1741041bdd50afb57;hp=f83444922b1e3fb045df1c8efc79d3eaf1534279;hb=176fa33f17dd78355cc572e006d2ab26898e2c69;hpb=09a416591da9ad89e0e6ca85e5093b6eb629a98e diff --git a/compiler/cmm/MkZipCfgCmm.hs b/compiler/cmm/MkZipCfgCmm.hs index f834449..1d80650 100644 --- a/compiler/cmm/MkZipCfgCmm.hs +++ b/compiler/cmm/MkZipCfgCmm.hs @@ -7,31 +7,36 @@ module MkZipCfgCmm ( mkNop, mkAssign, mkStore, mkCall, mkCmmCall, mkUnsafeCall, mkFinalCall - , mkJump, mkCbranch, mkSwitch, mkReturn, mkComment, mkCmmIfThenElse - , mkCmmWhileDo - , (<*>), sequence, mkLabel, mkBranch + , mkJump, mkCbranch, mkSwitch, mkReturn, mkComment, copyIn, copyOut, mkEntry + , mkCmmIfThenElse, mkCmmIfThen, mkCmmWhileDo + , mkAddToContext + , (<*>), 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(..) ) 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 Prelude hiding( sequence ) +import Panic +import ZipCfg type CmmGraph = LGraph Middle Last type CmmAGraph = AGraph Middle Last @@ -39,6 +44,8 @@ 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 @@ -51,59 +58,134 @@ mkStore :: CmmExpr -> CmmExpr -> CmmAGraph mkCall :: CmmExpr -> CCallConv -> CmmFormals -> CmmActuals -> C_SRT -> CmmAGraph mkCmmCall :: CmmExpr -> CmmFormals -> CmmActuals -> C_SRT -> CmmAGraph -- Native C-- calling convention -mkUnsafeCall :: CmmCallTarget -> CmmFormals -> CmmActuals -> CmmAGraph +mkUnsafeCall :: MidCallTarget -> CmmFormals -> CmmActuals -> CmmAGraph mkFinalCall :: CmmExpr -> CCallConv -> CmmActuals -> CmmAGraph -- Never returns; like exit() or barf() +---------- Context manipulation ("return via") +mkAddToContext :: CmmExpr -> [CmmExpr] -> CmmAGraph + ---------- Control transfer mkJump :: CmmExpr -> CmmActuals -> CmmAGraph -mkCbranch :: CmmExpr -> BlockId -> BlockId -> CmmAGraph -mkSwitch :: CmmExpr -> [Maybe BlockId] -> CmmAGraph +mkCbranch :: CmmExpr -> BlockId -> BlockId -> CmmAGraph +mkSwitch :: CmmExpr -> [Maybe BlockId] -> CmmAGraph mkReturn :: CmmActuals -> 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 -> 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 Nothing <*> tbranch <*> mkBranch endif <*> + mkLabel endif Nothing + -- ================ IMPLEMENTATION ================-- -mkNop = emptyAgraph +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 + +-- 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 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) +mkAddToContext ra actuals = mkMiddle $ MidAddToContext ra actuals + +cmmResConv :: Convention +cmmResConv = Native + +-- Return the number of bytes used for copying arguments, as well as the +-- instructions to copy the arguments. +copyIn :: Convention -> Bool -> Area -> CmmFormals -> (Int, [Middle]) +copyIn _ isCall area formals = + foldr ci (init_offset, []) $ assignArgumentsPos isCall localRegType formals + where ci (reg, RegisterParam r) (n, ms) = + (n, MidAssign (CmmLocal reg) (CmmReg $ CmmGlobal r) : ms) + ci (reg, StackParam off) (n, ms) = + let ty = localRegType reg + off' = off + init_offset + in (max n off', + MidAssign (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 -> (Int, [Middle]) +copyOut _ transfer area@(CallArea a) actuals = + foldr co (init_offset, []) args' + where args = assignArgumentsPos skip_node cmmExprType actuals + skip_node = transfer /= Ret + (setRA, init_offset) = + case a of Young id -> -- set RA if making a call + if transfer == Call then + ([(CmmLit (CmmLabel (infoTblLbl id)), + StackParam init_offset)], ra_width) + else ([], 0) + Old -> ([], ra_width) + 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 = + let (off, copies) = copyIn conv False (CallArea Old) formals in + (off, mkMiddles copies) + +-- I'm not sure how to get the calling conventions right yet, +-- and I suspect this should not be resolved until sometime after +-- Simon's patch is applied. +-- For now, I apply a bogus calling convention: all arguments go on the +-- stack, using the same amount of stack space. + +lastWithArgs :: Transfer -> Area -> Convention -> CmmActuals -> (Int -> Last) -> CmmAGraph +lastWithArgs transfer area conv actuals last = + let (outArgs, copies) = copyOut conv transfer area actuals in + mkMiddles copies <*> mkLast (last outArgs) + +-- The area created for the jump and return arguments is the same area as the +-- procedure entry. +mkJump e actuals = lastWithArgs Jump (CallArea Old) cmmResConv actuals $ LastJump e +mkReturn actuals = lastWithArgs Ret (CallArea Old) cmmResConv actuals $ LastJump e + where e = CmmStackSlot (CallArea Old) (widthInBytes wordWidth) + +mkFinalCall f _ actuals = + lastWithArgs Call (CallArea Old) Native actuals $ LastCall f Nothing mkCmmCall f results actuals srt = mkCall f CmmCallConv results actuals srt -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) +-- I'm dropping the SRT, but that should be okay: we plan to reconstruct it later. +mkCall f _ results actuals _ = + withFreshLabel "call successor" $ \k -> + let area = CallArea $ Young k + (off, copyin) = copyIn Native False area results + copyout = lastWithArgs Call area Native actuals $ LastCall f (Just k) + in copyout <*> mkLabel k (Just off) <*> (mkMiddles copyin)