X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=compiler%2FcodeGen%2FCgForeignCall.hs;h=23b68d867f1364f0dca847a1652f3ef5f71e5a29;hb=17b297d97d327620ed6bfab942f8992b2446f1bf;hp=10f41bdf8bc1ae70297d96c8b322daba4545d8d9;hpb=0065d5ab628975892cea1ec7303f968c3338cbe1;p=ghc-hetmet.git diff --git a/compiler/codeGen/CgForeignCall.hs b/compiler/codeGen/CgForeignCall.hs index 10f41bd..23b68d8 100644 --- a/compiler/codeGen/CgForeignCall.hs +++ b/compiler/codeGen/CgForeignCall.hs @@ -2,10 +2,17 @@ -- -- Code generation for foreign calls. -- --- (c) The University of Glasgow 2004 +-- (c) The University of Glasgow 2004-2006 -- ----------------------------------------------------------------------------- +{-# OPTIONS_GHC -w #-} +-- The above warning supression flag is a temporary kludge. +-- While working on this module you are encouraged to remove it and fix +-- any warnings in the module. See +-- http://hackage.haskell.org/trac/ghc/wiki/WorkingConventions#Warnings +-- for details + module CgForeignCall ( cgForeignCall, emitForeignCall, @@ -19,31 +26,31 @@ module CgForeignCall ( #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 Monad ( when ) +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 @@ -63,7 +70,7 @@ 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 @@ -71,8 +78,9 @@ 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) + (CmmCallee cmm_target cconv) call_args (Just vols) srt CmmMayReturn where (call_args, cmm_target) = case target of @@ -91,44 +99,58 @@ 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 + -> 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 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 - stmtC (CmmCall (CmmForeignCall suspendThread CCallConv) - [(id,PtrHint)] + 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 (CmmCallee 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 - ) + CmmUnsafe ret) + stmtC (CmmCall temp_target results temp_args CmmUnsafe ret) + stmtC (CmmCall (CmmCallee resumeThread CCallConv) + [ (new_base, PtrHint) ] + [ (CmmReg (CmmLocal id), PtrHint) ] + 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"))) @@ -140,16 +162,26 @@ 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 = mapM arg_assign_temp + where arg_assign_temp (e,hint) = do + tmp <- maybe_assign_temp e + return (tmp,hint) -maybe_assignTemp (e, hint) - | hasNoGlobalRegs e = return (e, hint) +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 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 <- newNonPtrTemp (cmmExprRep e) --TODO FIXME NOW + stmtC (CmmAssign (CmmLocal reg) e) + return (CmmReg (CmmLocal reg)) -- ----------------------------------------------------------------------------- -- Save/restore the thread state in the TSO @@ -169,22 +201,22 @@ 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;