X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FcodeGen%2FCgForeignCall.hs;h=5d84da773c2d9757304409a0c85ee27c20669ecb;hb=d9e8e6f9538b095e933ce2280073548b179b6765;hp=da52bd09d1ddfe091b48807905b9ac021289442c;hpb=49c98d143c382a1341e1046f5ca00819a25691ba;p=ghc-hetmet.git diff --git a/compiler/codeGen/CgForeignCall.hs b/compiler/codeGen/CgForeignCall.hs index da52bd0..5d84da7 100644 --- a/compiler/codeGen/CgForeignCall.hs +++ b/compiler/codeGen/CgForeignCall.hs @@ -32,17 +32,24 @@ import CmmUtils import MachOp import SMRep import ForeignCall +import ClosureInfo import Constants import StaticFlags import Outputable +import MachRegs (callerSaveVolatileRegs) + -- HACK: this is part of the NCG so we shouldn't use this, but we need + -- it for now to eliminate the need for saved regs to be in CmmCall. + -- The long term solution is to factor callerSaveVolatileRegs + -- from nativeGen into codeGen + import Control.Monad -- ----------------------------------------------------------------------------- -- Code generation for Foreign Calls cgForeignCall - :: [(CmmReg,MachHint)] -- where to put the results + :: CmmHintFormals -- where to put the results -> ForeignCall -- the op -> [StgArg] -- arguments -> StgLiveVars -- live vars, in case we need to save them @@ -62,7 +69,7 @@ cgForeignCall results fcall stg_args live emitForeignCall - :: [(CmmReg,MachHint)] -- where to put the results + :: CmmHintFormals -- where to put the results -> ForeignCall -- the op -> [(CmmExpr,MachHint)] -- arguments -> StgLiveVars -- live vars, in case we need to save them @@ -70,8 +77,9 @@ emitForeignCall 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) + (CmmForeignCall cmm_target cconv) call_args (Just vols) srt where (call_args, cmm_target) = case target of @@ -90,45 +98,57 @@ emitForeignCall results (CCall (CCallSpec target cconv safety)) args live -- ToDo: this might not be correct for 64-bit API arg_size rep = max (machRepByteWidth rep) wORD_SIZE -emitForeignCall results (DNCall _) args live +emitForeignCall _ (DNCall _) _ _ = panic "emitForeignCall: DNCall" -- alternative entry point, used by CmmParse emitForeignCall' :: Safety - -> [(CmmReg,MachHint)] -- where to put the results + -> CmmHintFormals -- where to put the results -> CmmCallTarget -- the op -> [(CmmExpr,MachHint)] -- arguments -> Maybe [GlobalReg] -- live vars, in case we need to save them + -> C_SRT -- the SRT of the calls continuation -> Code -emitForeignCall' safety results target args vols +emitForeignCall' safety results target args vols srt | 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) + stmtsC caller_load | otherwise = do - id <- newTemp wordRep + -- Both 'id' and 'new_base' are KindNonPtr because they're + -- RTS only objects and are not subject to garbage collection + id <- newNonPtrTemp wordRep + new_base <- newNonPtrTemp (cmmRegRep (CmmGlobal BaseReg)) temp_args <- load_args_into_temps args temp_target <- load_target_into_temp target + let (caller_save, caller_load) = callerSaveVolatileRegs vols emitSaveThreadState + 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 will be the one to convert that + -- to this sequence of three CmmUnsafe calls. stmtC (CmmCall (CmmForeignCall suspendThread CCallConv) - [(id,PtrHint)] + [ (id,PtrHint) ] [ (CmmReg (CmmGlobal BaseReg), PtrHint) ] - vols - ) - stmtC (CmmCall temp_target results temp_args vols) + CmmUnsafe) + stmtC (CmmCall temp_target results temp_args CmmUnsafe) stmtC (CmmCall (CmmForeignCall resumeThread CCallConv) - [ (CmmGlobal BaseReg, PtrHint) ] - -- Assign the result to BaseReg: we - -- might now have a different - -- Capability! - [ (CmmReg id, PtrHint) ] - vols - ) + [ (new_base, PtrHint) ] + [ (CmmReg (CmmLocal id), PtrHint) ] + CmmUnsafe) + -- 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"))) @@ -148,17 +168,18 @@ load_args_into_temps = mapM arg_assign_temp load_target_into_temp (CmmForeignCall expr conv) = do tmp <- maybe_assign_temp expr return (CmmForeignCall tmp conv) -load_target_info_temp other_target = +load_target_into_temp other_target = return other_target 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) + -- expressions, which are wrong here. + -- this is a NonPtr because it only duplicates an existing + reg <- newNonPtrTemp (cmmExprRep e) --TODO FIXME NOW + stmtC (CmmAssign (CmmLocal reg) e) + return (CmmReg (CmmLocal reg)) -- ----------------------------------------------------------------------------- -- Save/restore the thread state in the TSO @@ -178,22 +199,22 @@ emitSaveThreadState = do emitCloseNursery = stmtC $ CmmStore nursery_bdescr_free (cmmOffsetW stgHp 1) emitLoadThreadState = do - tso <- newTemp wordRep + tso <- newNonPtrTemp wordRep -- TODO FIXME NOW stmtsC [ -- tso = CurrentTSO; - CmmAssign tso stgCurrentTSO, + CmmAssign (CmmLocal tso) stgCurrentTSO, -- Sp = tso->sp; - CmmAssign sp (CmmLoad (cmmOffset (CmmReg tso) tso_SP) + CmmAssign sp (CmmLoad (cmmOffset (CmmReg (CmmLocal tso)) tso_SP) wordRep), -- SpLim = tso->stack + RESERVED_STACK_WORDS; - CmmAssign spLim (cmmOffsetW (cmmOffset (CmmReg tso) tso_STACK) + CmmAssign spLim (cmmOffsetW (cmmOffset (CmmReg (CmmLocal tso)) tso_STACK) rESERVED_STACK_WORDS) ] 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) wordRep)) emitOpenNursery = stmtsC [ -- Hp = CurrentNursery->free - 1;