X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2FMkZipCfgCmm.hs;h=29d8daf4c9a832b1cfe2f462795cb1fb4699b008;hp=34e7dff69c06820ab2d31a749aa9fba13a2a17ce;hb=e239aa2329416a2822fcc03c4ed486c7d28739e1;hpb=03637b410406930a46344b913a8a1b7232bf840e diff --git a/compiler/cmm/MkZipCfgCmm.hs b/compiler/cmm/MkZipCfgCmm.hs index 34e7dff..29d8daf 100644 --- a/compiler/cmm/MkZipCfgCmm.hs +++ b/compiler/cmm/MkZipCfgCmm.hs @@ -6,38 +6,50 @@ -- complain to Norman Ramsey. module MkZipCfgCmm - ( mkNop, mkAssign, mkStore, mkCall, mkCmmCall, mkUnsafeCall, mkFinalCall - , mkJump, mkCbranch, mkSwitch, mkReturn, mkComment, mkCmmIfThenElse - , mkCmmWhileDo - , (<*>), sequence, mkLabel, mkBranch + ( 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, Middle, Last, Convention(..) + , CmmZ, CmmTopZ, CmmGraph, CmmBlock, CmmAGraph, CmmStackInfo + , Middle, Last, Convention(..), ForeignConvention(..), MidCallTarget(..), Transfer(..) + , 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 Prelude hiding( sequence ) +import Outputable +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 ---------- No-ops mkNop :: CmmAGraph @@ -48,62 +60,213 @@ mkAssign :: CmmReg -> CmmExpr -> CmmAGraph mkStore :: CmmExpr -> CmmExpr -> CmmAGraph ---------- Calls -mkCall :: CmmExpr -> CCallConv -> CmmFormals -> CmmActuals -> C_SRT -> CmmAGraph -mkCmmCall :: CmmExpr -> CmmFormals -> CmmActuals -> C_SRT -> CmmAGraph +mkCall :: CmmExpr -> Convention -> CmmFormals -> CmmActuals -> + UpdFrameOffset -> CmmAGraph +mkCmmCall :: CmmExpr -> CmmFormals -> CmmActuals -> + UpdFrameOffset -> CmmAGraph -- Native C-- calling convention -mkUnsafeCall :: CmmCallTarget -> CmmFormals -> CmmActuals -> CmmAGraph -mkFinalCall :: CmmExpr -> CCallConv -> CmmActuals -> CmmAGraph +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 -mkCbranch :: CmmExpr -> BlockId -> BlockId -> CmmAGraph -mkSwitch :: CmmExpr -> [Maybe BlockId] -> CmmAGraph -mkReturn :: 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 :: 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 -> 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 <*> tbranch <*> mkBranch endif <*> + mkLabel endif + -- ================ IMPLEMENTATION ================-- 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 +-- 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) + +-- 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 -> Bool -> Area -> CmmFormals -> (Int, CmmAGraph) +copyInSlot :: Convention -> Bool -> CmmFormals -> CmmAGraph +copyOutOflow :: Convention -> Transfer -> Area -> CmmActuals -> UpdFrameOffset -> + (Int, [Middle]) +copyOutSlot :: Convention -> Transfer -> [LocalReg] -> [Middle] + -- why a list of middles here instead of an AGraph? + +copyInOflow = copyIn oneCopyOflowI +copyInSlot c i f = snd $ copyIn oneCopySlotI c i (panic "no area for copying to slots") f + +type SlotCopier = Area -> (LocalReg, ByteOff) -> (ByteOff, CmmAGraph) -> + (ByteOff, CmmAGraph) +type CopyIn = SlotCopier -> Convention -> Bool -> Area -> CmmFormals -> + (ByteOff, CmmAGraph) + +-- Return the number of bytes used for copying arguments, as well as the +-- instructions to copy the arguments. +copyIn :: CopyIn +copyIn oflow conv isCall area formals = + foldr ci (init_offset, mkNop) args' + where ci (reg, RegisterParam r) (n, ms) = + (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 isCall 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. +copyOutOflow conv transfer area@(CallArea a) actuals updfr_off = + foldr co (init_offset, []) args' + 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@(BlockId _) -> -- set RA if making a call + if transfer == Call then + ([(CmmLit (CmmBlock id), StackParam init_offset)], + widthInBytes wordWidth) + else ([], 0) + Old -> ([], updfr_off) + args = assignArgumentsPos conv (transfer /= Ret) 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 +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 transfer 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 (transfer /= Ret) localRegType actuals + +-- oneCopySlotO _ (reg, _) (n, ms) = +-- (n, MidStore (CmmStackSlot (RegSlot reg) w) reg : ms) +-- where w = widthInBytes (typeWidth (localRegType reg)) -mkUnsafeCall tgt results actuals = mkMiddle $ MidUnsafeCall tgt results actuals +mkEntry :: BlockId -> Convention -> CmmFormals -> (Int, CmmAGraph) +mkEntry _ conv formals = copyInOflow conv False (CallArea Old) formals -cmmArgConv, cmmResConv :: Convention -cmmArgConv = ConventionStandard CmmCallConv Arguments -cmmResConv = ConventionStandard CmmCallConv Arguments +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) -mkJump e actuals = mkMiddle (CopyOut cmmArgConv actuals) <*> mkLast (LastJump e) -mkReturn actuals = mkMiddle (CopyOut cmmResConv actuals) <*> mkLast LastReturn +-- 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 -> 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 NativeCall 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 conv actuals = - mkMiddle (CopyOut (ConventionStandard conv Arguments) actuals) <*> - mkLast (LastCall f Nothing) +mkFinalCall f _ actuals updfr_off = + lastWithArgs Call old NativeCall actuals updfr_off $ toCall f Nothing updfr_off 0 -mkCmmCall f results actuals srt = mkCall f CmmCallConv results actuals srt +mkCmmCall f results actuals = mkCall f NativeCall results actuals -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 conv results actuals updfr_off = + pprTrace "mkCall" (ppr f <+> ppr actuals <+> ppr results <+> ppr conv) $ + withFreshLabel "call successor" $ \k -> + let area = CallArea $ Young k + (off, copyin) = copyInOflow conv False area results + copyout = lastWithArgs Call area conv actuals updfr_off + (toCall f (Just k) updfr_off off) + in (copyout <*> mkLabel k <*> copyin)