X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fcmm%2FMkZipCfgCmm.hs;h=06830581ad1ca66dc0ae8cc691e0dfbfc2d9e7d0;hb=8a9eb3cd35117c62ac9758d118c6f4109b7330cb;hp=1d806508586dfc2caf194ef1741041bdd50afb57;hpb=176fa33f17dd78355cc572e006d2ab26898e2c69;p=ghc-hetmet.git diff --git a/compiler/cmm/MkZipCfgCmm.hs b/compiler/cmm/MkZipCfgCmm.hs index 1d80650..0683058 100644 --- a/compiler/cmm/MkZipCfgCmm.hs +++ b/compiler/cmm/MkZipCfgCmm.hs @@ -6,15 +6,16 @@ -- complain to Norman Ramsey. module MkZipCfgCmm - ( mkNop, mkAssign, mkStore, mkCall, mkCmmCall, mkUnsafeCall, mkFinalCall - , mkJump, mkCbranch, mkSwitch, mkReturn, mkComment, copyIn, copyOut, mkEntry - , mkCmmIfThenElse, mkCmmIfThen, mkCmmWhileDo - , mkAddToContext + ( mkNop, mkAssign, mkStore, mkCall, mkCmmCall, mkSafeCall, mkUnsafeCall, mkFinalCall + , mkJump, mkForeignJump, mkJumpGC, mkCbranch, mkSwitch, mkReturn + , mkReturnSimple, mkComment, copyInOflow, copyInSlot, copyOutOflow, copyOutSlot + , mkEntry, mkCmmIfThenElse, mkCmmIfThen, mkCmmWhileDo , (<*>), catAGraphs, mkLabel, mkBranch , emptyAGraph, withFreshLabel, withUnique, outOfLine , lgraphOfAGraph, graphOfAGraph, labelAGraph - , CmmZ, CmmTopZ, CmmGraph, CmmBlock, CmmAGraph + , CmmZ, CmmTopZ, CmmGraph, CmmBlock, CmmAGraph, CmmStackInfo , Middle, Last, Convention(..), ForeignConvention(..), MidCallTarget(..), Transfer(..) + , stackStubExpr, pprAGraph ) where @@ -31,18 +32,21 @@ import ZipCfgCmmRep hiding (CmmGraph, CmmAGraph, CmmBlock, CmmZ, CmmTopZ) -- duplicated below import PprCmm() -import ClosureInfo import FastString import ForeignCall import MkZipCfg import Panic +import SMRep (ByteOff) +import StaticFlags import ZipCfg type CmmGraph = LGraph Middle Last type CmmAGraph = AGraph Middle Last type CmmBlock = Block Middle Last -type CmmZ = GenCmm CmmStatic CmmInfo CmmGraph -type CmmTopZ = GenCmmTop CmmStatic CmmInfo CmmGraph +type CmmStackInfo = (ByteOff, Maybe ByteOff) + -- probably want a record; (SP offset on entry, update frame space) +type CmmZ = GenCmm CmmStatic CmmInfo (CmmStackInfo, CmmGraph) +type CmmTopZ = GenCmmTop CmmStatic CmmInfo (CmmStackInfo, CmmGraph) data Transfer = Call | Jump | Ret deriving Eq @@ -55,21 +59,24 @@ mkAssign :: CmmReg -> CmmExpr -> CmmAGraph mkStore :: CmmExpr -> CmmExpr -> CmmAGraph ---------- Calls -mkCall :: CmmExpr -> CCallConv -> CmmFormals -> CmmActuals -> C_SRT -> CmmAGraph -mkCmmCall :: CmmExpr -> CmmFormals -> CmmActuals -> C_SRT -> CmmAGraph - -- Native C-- calling convention -mkUnsafeCall :: MidCallTarget -> CmmFormals -> CmmActuals -> CmmAGraph -mkFinalCall :: CmmExpr -> CCallConv -> CmmActuals -> CmmAGraph - -- Never returns; like exit() or barf() - ----------- Context manipulation ("return via") -mkAddToContext :: CmmExpr -> [CmmExpr] -> CmmAGraph +mkCall :: CmmExpr -> (Convention, 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 -> CmmAGraph +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 :: CmmActuals -> CmmAGraph +mkReturn :: CmmExpr -> CmmActuals -> UpdFrameOffset -> CmmAGraph +mkReturnSimple :: CmmActuals -> UpdFrameOffset -> CmmAGraph mkCmmIfThenElse :: CmmExpr -> CmmAGraph -> CmmAGraph -> CmmAGraph mkCmmIfThen :: CmmExpr -> CmmAGraph -> CmmAGraph @@ -91,8 +98,8 @@ 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 + mkLabel tid <*> tbranch <*> mkBranch endif <*> + mkLabel endif @@ -100,92 +107,163 @@ mkCmmIfThen e tbranch mkNop = emptyAGraph mkComment fs = mkMiddle $ MidComment fs -mkAssign l r = mkMiddle $ MidAssign l r mkStore l r = mkMiddle $ MidStore l r +-- 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 - -mkUnsafeCall tgt results actuals = mkMiddle $ MidUnsafeCall tgt results actuals -mkAddToContext ra actuals = mkMiddle $ MidAddToContext ra actuals - -cmmResConv :: Convention -cmmResConv = Native +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) + +-- When we copy in parameters, we usually want to put overflow +-- parameters on the stack, but sometimes we want to pass +-- the variables in their spill slots. +-- Therefore, for copying arguments and results, we provide different +-- functions to pass the arguments in an overflow area and to pass them in spill slots. +copyInOflow :: Convention -> Area -> CmmFormals -> (Int, CmmAGraph) +copyInSlot :: Convention -> CmmFormals -> CmmAGraph +copyOutOflow :: Convention -> Transfer -> Area -> CmmActuals -> UpdFrameOffset -> + (Int, [Middle]) +copyOutSlot :: Convention -> [LocalReg] -> [Middle] + -- why a list of middles here instead of an AGraph? + +copyInOflow = copyIn oneCopyOflowI +copyInSlot c f = snd $ copyIn oneCopySlotI c (panic "no area for copying to slots") f + +type SlotCopier = Area -> (LocalReg, ByteOff) -> (ByteOff, CmmAGraph) -> + (ByteOff, CmmAGraph) +type CopyIn = SlotCopier -> Convention -> Area -> CmmFormals -> (ByteOff, CmmAGraph) -- 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 +copyIn :: CopyIn +copyIn oflow conv area formals = + foldr ci (init_offset, mkNop) args' 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 + (n, mkAssign (CmmLocal reg) (CmmReg $ CmmGlobal r) <*> ms) + ci (r, StackParam off) (n, ms) = oflow area (r, off) (n, ms) + init_offset = widthInBytes wordWidth -- infotable + args = assignArgumentsPos conv localRegType formals + args' = foldl adjust [] args + where adjust rst (v, StackParam off) = (v, StackParam (off + init_offset)) : rst + adjust rst x@(_, RegisterParam _) = x : rst + +-- Copy-in one arg, using overflow space if needed. +oneCopyOflowI, oneCopySlotI :: SlotCopier +oneCopyOflowI area (reg, off) (n, ms) = + (max n off, mkAssign (CmmLocal reg) (CmmLoad (CmmStackSlot area off) ty) <*> ms) + where ty = localRegType reg + +-- Copy-in one arg, using spill slots if needed -- used for calling conventions at +-- a procpoint that is not a return point. The offset is irrelevant here... +oneCopySlotI _ (reg, _) (n, ms) = + (n, mkAssign (CmmLocal reg) (CmmLoad (CmmStackSlot (RegSlot reg) w) ty) <*> ms) + where ty = localRegType reg + w = widthInBytes (typeWidth ty) + + +-- Factoring out the common parts of the copyout functions yielded something +-- more complicated: -- 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 = +copyOutOflow conv transfer area@(CallArea a) actuals updfr_off = foldr co (init_offset, []) args' - where args = assignArgumentsPos skip_node cmmExprType actuals - skip_node = transfer /= Ret + where 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) (setRA, init_offset) = - case a of Young id -> -- set RA if making a call + case a of Young id@(BlockId _) -> -- set RA if making a call if transfer == Call then - ([(CmmLit (CmmLabel (infoTblLbl id)), - StackParam init_offset)], ra_width) + ([(CmmLit (CmmBlock id), StackParam init_offset)], + widthInBytes wordWidth) else ([], 0) - Old -> ([], ra_width) - ra_width = widthInBytes wordWidth + Old -> ([], updfr_off) + args = assignArgumentsPos conv cmmExprType actuals 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" +copyOutOflow _ _ (RegSlot _) _ _ = panic "cannot copy arguments into a register slot" + +-- Args passed only in registers and stack slots; no overflow space. +-- No return address may apply! +copyOutSlot conv actuals = foldr co [] args + where co (v, RegisterParam r) ms = MidAssign (CmmGlobal r) (toExp v) : ms + co (v, StackParam off) ms = + MidStore (CmmStackSlot (RegSlot v) off) (toExp v) : ms + toExp r = CmmReg (CmmLocal r) + args = assignArgumentsPos conv localRegType actuals + +-- oneCopySlotO _ (reg, _) (n, ms) = +-- (n, MidStore (CmmStackSlot (RegSlot reg) w) reg : ms) +-- where w = widthInBytes (typeWidth (localRegType reg)) 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 +mkEntry _ conv formals = copyInOflow conv (CallArea Old) formals + +lastWithArgs :: Transfer -> Area -> Convention -> CmmActuals -> UpdFrameOffset -> + (ByteOff -> Last) -> CmmAGraph +lastWithArgs transfer area conv actuals updfr_off last = + let (outArgs, copies) = copyOutOflow 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. -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 +old :: Area +old = CallArea Old +toCall :: CmmExpr -> Maybe BlockId -> UpdFrameOffset -> ByteOff -> ByteOff -> Last +toCall e cont updfr_off res_space arg_space = + LastCall e cont arg_space res_space (Just updfr_off) +mkJump e actuals updfr_off = + lastWithArgs Jump old NativeNodeCall actuals updfr_off $ toCall e Nothing updfr_off 0 +mkJumpGC e actuals updfr_off = + lastWithArgs Jump old GC actuals updfr_off $ toCall e Nothing updfr_off 0 +mkForeignJump conv e actuals updfr_off = + lastWithArgs Jump old conv actuals updfr_off $ toCall e Nothing updfr_off 0 +mkReturn e actuals updfr_off = + lastWithArgs Ret old NativeReturn actuals updfr_off $ toCall e Nothing updfr_off 0 + -- where e = CmmLoad (CmmStackSlot (CallArea Old) updfr_off) gcWord +mkReturnSimple actuals updfr_off = + lastWithArgs Ret old NativeReturn actuals updfr_off $ toCall e Nothing updfr_off 0 + where e = CmmLoad (CmmStackSlot (CallArea Old) updfr_off) gcWord + +mkFinalCall f _ actuals updfr_off = + lastWithArgs Call old NativeDirectCall actuals updfr_off $ toCall f Nothing updfr_off 0 + +mkCmmCall f results actuals = mkCall f (NativeDirectCall, NativeReturn) results actuals -- I'm dropping the SRT, but that should be okay: we plan to reconstruct it later. -mkCall f _ results actuals _ = +mkCall f (callConv, retConv) results actuals updfr_off = 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) + let area = CallArea $ Young k + (off, copyin) = copyInOflow retConv area results + copyout = lastWithArgs Call area callConv actuals updfr_off + (toCall f (Just k) updfr_off off) + in (copyout <*> mkLabel k <*> copyin)