X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FcodeGen%2FCgForeignCall.hs;h=901dd96502e71f3c94f00272409dd54f19d3d154;hp=10f41bdf8bc1ae70297d96c8b322daba4545d8d9;hb=6e9c0431a7cf2bf1a48f01db48c6a1d41fe15a09;hpb=0065d5ab628975892cea1ec7303f968c3338cbe1 diff --git a/compiler/codeGen/CgForeignCall.hs b/compiler/codeGen/CgForeignCall.hs index 10f41bd..901dd96 100644 --- a/compiler/codeGen/CgForeignCall.hs +++ b/compiler/codeGen/CgForeignCall.hs @@ -2,7 +2,7 @@ -- -- Code generation for foreign calls. -- --- (c) The University of Glasgow 2004 +-- (c) The University of Glasgow 2004-2006 -- ----------------------------------------------------------------------------- @@ -17,33 +17,33 @@ module CgForeignCall ( emitOpenNursery, ) where -#include "HsVersions.h" - -import StgSyn ( StgLiveVars, StgArg, stgArgType ) -import CgProf ( curCCS, curCCSAddr ) -import CgBindery ( getVolatileRegs, getArgAmodes ) +import StgSyn +import CgProf +import CgBindery import CgMonad -import CgUtils ( cmmOffsetW, cmmOffsetB, cmmLoadIndexW, newTemp, - assignTemp ) -import Type ( tyConAppTyCon, repType ) +import CgUtils +import Type import TysPrim -import CLabel ( mkForeignLabel, mkRtsCodeLabel ) +import CLabel import Cmm import CmmUtils -import MachOp import SMRep import ForeignCall +import ClosureInfo import Constants -import StaticFlags ( opt_SccProfilingOn ) +import StaticFlags import Outputable +import Module +import FastString +import BasicTypes -import Monad ( when ) +import Control.Monad -- ----------------------------------------------------------------------------- -- Code generation for Foreign Calls cgForeignCall - :: [(CmmReg,MachHint)] -- where to put the results + :: HintedCmmFormals -- where to put the results -> ForeignCall -- the op -> [StgArg] -- arguments -> StgLiveVars -- live vars, in case we need to save them @@ -57,80 +57,108 @@ cgForeignCall results fcall stg_args live | (stg_arg, (rep,expr)) <- stg_args `zip` reps_n_amodes, nonVoidArg rep] - arg_hints = zip arg_exprs (map (typeHint.stgArgType) stg_args) + arg_hints = zipWith CmmHinted + arg_exprs (map (typeForeignHint.stgArgType) stg_args) -- in emitForeignCall results fcall arg_hints live emitForeignCall - :: [(CmmReg,MachHint)] -- where to put the results + :: HintedCmmFormals -- where to put the results -> ForeignCall -- the op - -> [(CmmExpr,MachHint)] -- arguments + -> [CmmHinted CmmExpr] -- arguments -> StgLiveVars -- live vars, in case we need to save them -> Code emitForeignCall results (CCall (CCallSpec target cconv safety)) args live = do vols <- getVolatileRegs live + srt <- getSRTInfo emitForeignCall' safety results - (CmmForeignCall cmm_target cconv) call_args (Just vols) + (CmmCallee cmm_target cconv) call_args (Just vols) srt CmmMayReturn where (call_args, cmm_target) = case target of - StaticTarget lbl -> (args, CmmLit (CmmLabel - (mkForeignLabel lbl call_size False))) - DynamicTarget -> case args of (fn,_):rest -> (rest, fn) + -- If the packageId is Nothing then the label is taken to be in the + -- package currently being compiled. + StaticTarget lbl mPkgId + -> let labelSource + = case mPkgId of + Nothing -> ForeignLabelInThisPackage + Just pkgId -> ForeignLabelInPackage pkgId + in ( args + , CmmLit (CmmLabel + (mkForeignLabel lbl call_size labelSource IsFunction))) + + -- A label imported with "foreign import ccall "dynamic" ..." + -- Note: "dynamic" here doesn't mean "dynamic library". + -- Read the FFI spec for details. + DynamicTarget -> case args of + (CmmHinted fn _):rest -> (rest, fn) + [] -> panic "emitForeignCall: DynamicTarget []" -- in the stdcall calling convention, the symbol needs @size appended -- to it, where size is the total number of bytes of arguments. We -- attach this info to the CLabel here, and the CLabel pretty printer -- will generate the suffix when the label is printed. call_size - | StdCallConv <- cconv = Just (sum (map (arg_size.cmmExprRep.fst) args)) + | StdCallConv <- cconv = Just (sum (map (arg_size.cmmExprType.hintlessCmm) args)) | otherwise = Nothing -- ToDo: this might not be correct for 64-bit API - arg_size rep = max (machRepByteWidth rep) wORD_SIZE - -emitForeignCall results (DNCall _) args live - = panic "emitForeignCall: DNCall" + arg_size rep = max (widthInBytes (typeWidth rep)) wORD_SIZE -- alternative entry point, used by CmmParse emitForeignCall' :: Safety - -> [(CmmReg,MachHint)] -- where to put the results + -> HintedCmmFormals -- where to put the results -> CmmCallTarget -- the op - -> [(CmmExpr,MachHint)] -- arguments + -> [CmmHinted CmmExpr] -- arguments -> Maybe [GlobalReg] -- live vars, in case we need to save them + -> C_SRT -- the SRT of the calls continuation + -> CmmReturnInfo -> Code -emitForeignCall' safety results target args vols +emitForeignCall' safety results target args vols _srt ret | not (playSafe safety) = do temp_args <- load_args_into_temps args - stmtC (CmmCall target results temp_args vols) + let (caller_save, caller_load) = callerSaveVolatileRegs vols + stmtsC caller_save + stmtC (CmmCall target results temp_args CmmUnsafe ret) + stmtsC caller_load | otherwise = do - id <- newTemp wordRep + -- Both 'id' and 'new_base' are GCKindNonPtr because they're + -- RTS only objects and are not subject to garbage collection + id <- newTemp bWord + new_base <- newTemp (cmmRegType (CmmGlobal BaseReg)) temp_args <- load_args_into_temps args + temp_target <- load_target_into_temp target + let (caller_save, caller_load) = callerSaveVolatileRegs vols emitSaveThreadState - stmtC (CmmCall (CmmForeignCall suspendThread CCallConv) - [(id,PtrHint)] - [ (CmmReg (CmmGlobal BaseReg), PtrHint) ] - vols - ) - stmtC (CmmCall target results temp_args vols) - stmtC (CmmCall (CmmForeignCall resumeThread CCallConv) - [ (CmmGlobal BaseReg, PtrHint) ] - -- Assign the result to BaseReg: we - -- might now have a different - -- Capability! - [ (CmmReg id, PtrHint) ] - vols - ) + stmtsC caller_save + -- The CmmUnsafe arguments are only correct because this part + -- of the code hasn't been moved into the CPS pass yet. + -- Once that happens, this function will just emit a (CmmSafe srt) call, + -- and the CPS will be the one to convert that + -- to this sequence of three CmmUnsafe calls. + stmtC (CmmCall (CmmCallee suspendThread CCallConv) + [ CmmHinted id AddrHint ] + [ CmmHinted (CmmReg (CmmGlobal BaseReg)) AddrHint ] + CmmUnsafe ret) + stmtC (CmmCall temp_target results temp_args CmmUnsafe ret) + stmtC (CmmCall (CmmCallee resumeThread CCallConv) + [ CmmHinted new_base AddrHint ] + [ CmmHinted (CmmReg (CmmLocal id)) AddrHint ] + CmmUnsafe ret) + -- Assign the result to BaseReg: we + -- might now have a different Capability! + stmtC (CmmAssign (CmmGlobal BaseReg) (CmmReg (CmmLocal new_base))) + stmtsC caller_load emitLoadThreadState - -suspendThread = CmmLit (CmmLabel (mkRtsCodeLabel SLIT("suspendThread"))) -resumeThread = CmmLit (CmmLabel (mkRtsCodeLabel SLIT("resumeThread"))) +suspendThread, resumeThread :: CmmExpr +suspendThread = CmmLit (CmmLabel (mkCmmCodeLabel rtsPackageId (fsLit "suspendThread"))) +resumeThread = CmmLit (CmmLabel (mkCmmCodeLabel rtsPackageId (fsLit "resumeThread"))) -- we might need to load arguments into temporaries before @@ -140,16 +168,29 @@ resumeThread = CmmLit (CmmLabel (mkRtsCodeLabel SLIT("resumeThread"))) -- -- This is a HACK; really it should be done in the back end, but -- it's easier to generate the temporaries here. -load_args_into_temps args = mapM maybe_assignTemp args +load_args_into_temps :: [CmmHinted CmmExpr] -> FCode [CmmHinted CmmExpr] +load_args_into_temps = mapM arg_assign_temp + where arg_assign_temp (CmmHinted e hint) = do + tmp <- maybe_assign_temp e + return (CmmHinted tmp hint) -maybe_assignTemp (e, hint) - | hasNoGlobalRegs e = return (e, hint) +load_target_into_temp :: CmmCallTarget -> FCode CmmCallTarget +load_target_into_temp (CmmCallee expr conv) = do + tmp <- maybe_assign_temp expr + return (CmmCallee tmp conv) +load_target_into_temp other_target = + return other_target + +maybe_assign_temp :: CmmExpr -> FCode CmmExpr +maybe_assign_temp e + | hasNoGlobalRegs e = return e | otherwise = do -- don't use assignTemp, it uses its own notion of "trivial" - -- expressions, which are wrong here - reg <- newTemp (cmmExprRep e) - stmtC (CmmAssign reg e) - return (CmmReg reg, hint) + -- expressions, which are wrong here. + -- this is a NonPtr because it only duplicates an existing + reg <- newTemp (cmmExprType e) --TODO FIXME NOW + stmtC (CmmAssign (CmmLocal reg) e) + return (CmmReg (CmmLocal reg)) -- ----------------------------------------------------------------------------- -- Save/restore the thread state in the TSO @@ -157,6 +198,7 @@ maybe_assignTemp (e, hint) -- This stuff can't be done in suspendThread/resumeThread, because it -- refers to global registers which aren't available in the C world. +emitSaveThreadState :: Code emitSaveThreadState = do -- CurrentTSO->sp = Sp; stmtC $ CmmStore (cmmOffset stgCurrentTSO tso_SP) stgSp @@ -166,39 +208,46 @@ emitSaveThreadState = do stmtC (CmmStore (cmmOffset stgCurrentTSO tso_CCCS) curCCS) -- CurrentNursery->free = Hp+1; +emitCloseNursery :: Code emitCloseNursery = stmtC $ CmmStore nursery_bdescr_free (cmmOffsetW stgHp 1) +emitLoadThreadState :: Code emitLoadThreadState = do - tso <- newTemp wordRep + tso <- newTemp bWord -- TODO FIXME NOW stmtsC [ -- tso = CurrentTSO; - CmmAssign tso stgCurrentTSO, + CmmAssign (CmmLocal tso) stgCurrentTSO, -- Sp = tso->sp; - CmmAssign sp (CmmLoad (cmmOffset (CmmReg tso) tso_SP) - wordRep), + CmmAssign sp (CmmLoad (cmmOffset (CmmReg (CmmLocal tso)) tso_SP) + bWord), -- SpLim = tso->stack + RESERVED_STACK_WORDS; - CmmAssign spLim (cmmOffsetW (cmmOffset (CmmReg tso) tso_STACK) - rESERVED_STACK_WORDS) + CmmAssign spLim (cmmOffsetW (cmmOffset (CmmReg (CmmLocal tso)) tso_STACK) + rESERVED_STACK_WORDS), + -- HpAlloc = 0; + -- HpAlloc is assumed to be set to non-zero only by a failed + -- a heap check, see HeapStackCheck.cmm:GC_GENERIC + CmmAssign hpAlloc (CmmLit zeroCLit) ] emitOpenNursery -- and load the current cost centre stack from the TSO when profiling: when opt_SccProfilingOn $ stmtC (CmmStore curCCSAddr - (CmmLoad (cmmOffset (CmmReg tso) tso_CCCS) wordRep)) + (CmmLoad (cmmOffset (CmmReg (CmmLocal tso)) tso_CCCS) bWord)) +emitOpenNursery :: Code emitOpenNursery = stmtsC [ -- Hp = CurrentNursery->free - 1; - CmmAssign hp (cmmOffsetW (CmmLoad nursery_bdescr_free wordRep) (-1)), + CmmAssign hp (cmmOffsetW (CmmLoad nursery_bdescr_free gcWord) (-1)), -- HpLim = CurrentNursery->start + -- CurrentNursery->blocks*BLOCK_SIZE_W - 1; CmmAssign hpLim (cmmOffsetExpr - (CmmLoad nursery_bdescr_start wordRep) + (CmmLoad nursery_bdescr_start bWord) (cmmOffset (CmmMachOp mo_wordMul [ - CmmMachOp (MO_S_Conv I32 wordRep) - [CmmLoad nursery_bdescr_blocks I32], + CmmMachOp (MO_SS_Conv W32 wordWidth) + [CmmLoad nursery_bdescr_blocks b32], CmmLit (mkIntCLit bLOCK_SIZE) ]) (-1) @@ -206,11 +255,12 @@ emitOpenNursery = stmtsC [ ) ] - +nursery_bdescr_free, nursery_bdescr_start, nursery_bdescr_blocks :: CmmExpr nursery_bdescr_free = cmmOffset stgCurrentNursery oFFSET_bdescr_free nursery_bdescr_start = cmmOffset stgCurrentNursery oFFSET_bdescr_start nursery_bdescr_blocks = cmmOffset stgCurrentNursery oFFSET_bdescr_blocks +tso_SP, tso_STACK, tso_CCCS :: ByteOff tso_SP = tsoFieldB oFFSET_StgTSO_sp tso_STACK = tsoFieldB oFFSET_StgTSO_stack tso_CCCS = tsoProfFieldB oFFSET_StgTSO_CCCS @@ -225,17 +275,20 @@ tsoFieldB off tsoProfFieldB :: ByteOff -> ByteOff tsoProfFieldB off = off + fixedHdrSize * wORD_SIZE +stgSp, stgHp, stgCurrentTSO, stgCurrentNursery :: CmmExpr stgSp = CmmReg sp stgHp = CmmReg hp stgCurrentTSO = CmmReg currentTSO stgCurrentNursery = CmmReg currentNursery +sp, spLim, hp, hpLim, currentTSO, currentNursery, hpAlloc :: CmmReg sp = CmmGlobal Sp spLim = CmmGlobal SpLim hp = CmmGlobal Hp hpLim = CmmGlobal HpLim currentTSO = CmmGlobal CurrentTSO currentNursery = CmmGlobal CurrentNursery +hpAlloc = CmmGlobal HpAlloc -- ----------------------------------------------------------------------------- -- For certain types passed to foreign calls, we adjust the actual