X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2FCmmBuildInfoTables.hs;h=3d0d6fb426d557d2bf5091e69e506b098ddc7f79;hp=4e3879f6be471080b6bd5387bc1d34d5abeb51c4;hb=889c084e943779e76d19f2ef5e970ff655f511eb;hpb=f1a90f54590e5a7a32a9c3ef2950740922b1f425 diff --git a/compiler/cmm/CmmBuildInfoTables.hs b/compiler/cmm/CmmBuildInfoTables.hs index 4e3879f..3d0d6fb 100644 --- a/compiler/cmm/CmmBuildInfoTables.hs +++ b/compiler/cmm/CmmBuildInfoTables.hs @@ -1,15 +1,17 @@ -{-# OPTIONS_GHC -XNoMonoLocalBinds #-} +{-# OPTIONS_GHC -XGADTs -XNoMonoLocalBinds #-} -- Norman likes local bindings -- If this module lives on I'd like to get rid of this flag in due course +-- Todo: remove + +{-# OPTIONS_GHC -fno-warn-warnings-deprecations #-} module CmmBuildInfoTables - ( CAFSet, CAFEnv, CmmTopForInfoTables(..), cafAnal, localCAFInfo, mkTopCAFInfo + ( CAFSet, CAFEnv, cafAnal, localCAFInfo, mkTopCAFInfo , setInfoTableSRT, setInfoTableStackMap , TopSRT, emptySRT, srtToData , bundleCAFs - , finishInfoTables, lowerSafeForeignCalls - , cafTransfers, liveSlotTransfers - , extendEnvWithSafeForeignCalls, extendEnvsForSafeForeignCalls ) + , lowerSafeForeignCalls + , cafTransfers, liveSlotTransfers) where #include "HsVersions.h" @@ -17,39 +19,34 @@ where import Constants import Digraph import qualified Prelude as P -import Prelude +import Prelude hiding (succ) import Util (sortLe) import BlockId import Bitmap import CLabel -import Cmm hiding (blockId) -import CmmInfo -import CmmProcPointZ +import Cmm +import CmmDecl +import CmmExpr import CmmStackLayout -import CmmTx -import DFMonad import Module import FastString import ForeignCall import IdInfo import Data.List import Maybes -import MkZipCfg -import MkZipCfgCmm hiding (CmmAGraph, CmmBlock, CmmTopZ, CmmZ, CmmGraph) +import MkGraph as M import Control.Monad import Name +import OptimizationFuel import Outputable import SMRep import StgCmmClosure import StgCmmForeign --- import StgCmmMonad import StgCmmUtils import UniqSupply -import ZipCfg hiding (zip, unzip, last) -import qualified ZipCfg as G -import ZipCfgCmmRep -import ZipDataflow + +import Compiler.Hoopl import Data.Map (Map) import qualified Data.Map as Map @@ -155,21 +152,17 @@ live_ptrs oldByte slotEnv areaMap bid = -- pprPanic "CallAreas must not be live across function calls" (ppr bid <+> ppr c) slots :: SubAreaSet -- The SubAreaSet for 'bid' - slots = expectJust "live_ptrs slots" $ lookupBlockEnv slotEnv bid + slots = expectJust "live_ptrs slots" $ mapLookup bid slotEnv youngByte = expectJust "live_ptrs bid_pos" $ Map.lookup (CallArea (Young bid)) areaMap --- Construct the stack maps for the given procedure. -setInfoTableStackMap :: SlotEnv -> AreaMap -> CmmTopForInfoTables -> CmmTopForInfoTables -setInfoTableStackMap _ _ t@(NoInfoTable _) = t -setInfoTableStackMap slotEnv areaMap t@(FloatingInfoTable _ bid updfr_off) = - updInfo (const (live_ptrs updfr_off slotEnv areaMap bid)) id t +-- Construct the stack maps for a procedure _if_ it needs an infotable. +-- When wouldn't a procedure need an infotable? If it is a procpoint that +-- is not the successor of a call. +setInfoTableStackMap :: SlotEnv -> AreaMap -> CmmTop -> CmmTop setInfoTableStackMap slotEnv areaMap - t@(ProcInfoTable (CmmProc (CmmInfo _ _ _) _ _ ((_, Just updfr_off), _)) procpoints) = - case blockSetToList procpoints of - [bid] -> updInfo (const (live_ptrs updfr_off slotEnv areaMap bid)) id t - _ -> panic "setInfoTableStackMap: unexpected number of procpoints" - -- until we stop splitting the graphs at procpoints in the native path -setInfoTableStackMap _ _ t = pprPanic "unexpected case for setInfoTableStackMap" (ppr t) + t@(CmmProc (TopInfo {stack_info=StackInfo {updfr_space = Just updfr_off}}) _ (CmmGraph {g_entry = eid})) = + updInfo (const (live_ptrs updfr_off slotEnv areaMap eid)) id t +setInfoTableStackMap _ _ t = t @@ -193,17 +186,15 @@ type CAFEnv = BlockEnv CAFSet -- First, an analysis to find live CAFs. cafLattice :: DataflowLattice CAFSet -cafLattice = DataflowLattice "live cafs" Map.empty add False - where add new old = if Map.size new' > Map.size old - then aTx new' - else noTx new' - where new' = new `Map.union` old - -cafTransfers :: BackwardTransfers Middle Last CAFSet -cafTransfers = BackwardTransfers first middle last +cafLattice = DataflowLattice "live cafs" Map.empty add + where add _ (OldFact old) (NewFact new) = case old `Map.union` new of + new' -> (changeIf $ Map.size new' > Map.size old, new') + +cafTransfers :: BwdTransfer CmmNode CAFSet +cafTransfers = mkBTransfer3 first middle last where first _ live = live - middle m live = foldExpDeepMiddle addCaf m live - last l env = foldExpDeepLast addCaf l (joinOuts cafLattice env l) + middle m live = foldExpDeep addCaf m live + last l live = foldExpDeep addCaf l (joinOutFacts cafLattice l live) addCaf e set = case e of CmmLit (CmmLabel c) -> add c set CmmLit (CmmLabelOff c _) -> add c set @@ -211,11 +202,8 @@ cafTransfers = BackwardTransfers first middle last _ -> set add l s = if hasCAF l then Map.insert (cvtToClosureLbl l) () s else s -type CafFix a = FuelMonad (BackwardFixedPoint Middle Last CAFSet a) -cafAnal :: LGraph Middle Last -> FuelMonad CAFEnv -cafAnal g = liftM zdfFpFacts (res :: CafFix ()) - where res = zdfSolveFromL emptyBlockEnv "live CAF analysis" cafLattice - cafTransfers (fact_bot cafLattice) g +cafAnal :: CmmGraph -> FuelUniqSM CAFEnv +cafAnal g = liftM snd $ dataflowPassBwd g [] $ analBwd cafLattice cafTransfers ----------------------------------------------------------------------- -- Building the SRTs @@ -249,7 +237,7 @@ addCAF caf srt = , elt_map = Map.insert caf last (elt_map srt) } where last = next_elt srt -srtToData :: TopSRT -> CmmZ +srtToData :: TopSRT -> Cmm srtToData srt = Cmm [CmmData RelocatableReadOnlyData (CmmDataLabel (lbl srt) : tbl)] where tbl = map (CmmStaticLit . CmmLabel) (reverse (rev_elts srt)) @@ -262,7 +250,7 @@ srtToData srt = Cmm [CmmData RelocatableReadOnlyData (CmmDataLabel (lbl srt) : t -- we make sure they're all close enough to the bottom of the table that the -- bitmap will be able to cover all of them. buildSRTs :: TopSRT -> Map CLabel CAFSet -> CAFSet -> - FuelMonad (TopSRT, Maybe CmmTopZ, C_SRT) + FuelUniqSM (TopSRT, Maybe CmmTop, C_SRT) buildSRTs topSRT topCAFMap cafs = do let liftCAF lbl () z = -- get CAFs for functions without static closures case Map.lookup lbl topCAFMap of Just cafs -> z `Map.union` cafs @@ -305,7 +293,7 @@ buildSRTs topSRT topCAFMap cafs = -- Construct an SRT bitmap. -- Adapted from simpleStg/SRT.lhs, which expects Id's. procpointSRT :: CLabel -> Map CLabel Int -> [CLabel] -> - FuelMonad (Maybe CmmTopZ, C_SRT) + FuelUniqSM (Maybe CmmTop, C_SRT) procpointSRT _ _ [] = return (Nothing, NoC_SRT) procpointSRT top_srt top_table entries = @@ -323,7 +311,7 @@ maxBmpSize :: Int maxBmpSize = widthInBits wordWidth `div` 2 -- Adapted from codeGen/StgCmmUtils, which converts from SRT to C_SRT. -to_SRT :: CLabel -> Int -> Int -> Bitmap -> FuelMonad (Maybe CmmTopZ, C_SRT) +to_SRT :: CLabel -> Int -> Int -> Bitmap -> FuelUniqSM (Maybe CmmTop, C_SRT) to_SRT top_srt off len bmp | len > maxBmpSize || bmp == [fromIntegral srt_escape] = do id <- getUniqueM @@ -344,13 +332,13 @@ to_SRT top_srt off len bmp -- keep its CAFs live.) -- Any procedure referring to a non-static CAF c must keep live -- any CAF that is reachable from c. -localCAFInfo :: CAFEnv -> CmmTopZ -> Maybe (CLabel, CAFSet) +localCAFInfo :: CAFEnv -> CmmTop -> Maybe (CLabel, CAFSet) localCAFInfo _ (CmmData _ _) = Nothing -localCAFInfo cafEnv (CmmProc (CmmInfo _ _ infoTbl) top_l _ (_, LGraph entry _)) = - case infoTbl of +localCAFInfo cafEnv (CmmProc top_info top_l (CmmGraph {g_entry=entry})) = + case info_tbl top_info of CmmInfoTable False _ _ _ -> Just (cvtToClosureLbl top_l, - expectJust "maybeBindCAFs" $ lookupBlockEnv cafEnv entry) + expectJust "maybeBindCAFs" $ mapLookup entry cafEnv) _ -> Nothing -- Once we have the local CAF sets for some (possibly) mutually @@ -383,109 +371,43 @@ mkTopCAFInfo localCAFs = foldl addToTop Map.empty g type StackLayout = [Maybe LocalReg] -- Bundle the CAFs used at a procpoint. -bundleCAFs :: CAFEnv -> CmmTopForInfoTables -> (CAFSet, CmmTopForInfoTables) -bundleCAFs cafEnv t@(ProcInfoTable _ procpoints) = - case blockSetToList procpoints of - [bid] -> (expectJust "bundleCAFs" (lookupBlockEnv cafEnv bid), t) - _ -> panic "setInfoTableStackMap: unexpect number of procpoints" - -- until we stop splitting the graphs at procpoints in the native path -bundleCAFs cafEnv t@(FloatingInfoTable _ bid _) = - (expectJust "bundleCAFs " (lookupBlockEnv cafEnv bid), t) -bundleCAFs _ t@(NoInfoTable _) = (Map.empty, t) +bundleCAFs :: CAFEnv -> CmmTop -> (CAFSet, CmmTop) +bundleCAFs cafEnv t@(CmmProc _ _ (CmmGraph {g_entry=entry})) = + (expectJust "bundleCAFs" (mapLookup entry cafEnv), t) +bundleCAFs _ t = (Map.empty, t) -- Construct the SRTs for the given procedure. -setInfoTableSRT :: Map CLabel CAFSet -> TopSRT -> (CAFSet, CmmTopForInfoTables) -> - FuelMonad (TopSRT, [CmmTopForInfoTables]) -setInfoTableSRT topCAFMap topSRT (cafs, t@(ProcInfoTable _ procpoints)) = - case blockSetToList procpoints of - [_] -> setSRT cafs topCAFMap topSRT t - _ -> panic "setInfoTableStackMap: unexpect number of procpoints" - -- until we stop splitting the graphs at procpoints in the native path -setInfoTableSRT topCAFMap topSRT (cafs, t@(FloatingInfoTable _ _ _)) = +setInfoTableSRT :: Map CLabel CAFSet -> TopSRT -> (CAFSet, CmmTop) -> + FuelUniqSM (TopSRT, [CmmTop]) +setInfoTableSRT topCAFMap topSRT (cafs, t) = setSRT cafs topCAFMap topSRT t -setInfoTableSRT _ topSRT (_, t@(NoInfoTable _)) = return (topSRT, [t]) setSRT :: CAFSet -> Map CLabel CAFSet -> TopSRT -> - CmmTopForInfoTables -> FuelMonad (TopSRT, [CmmTopForInfoTables]) + CmmTop -> FuelUniqSM (TopSRT, [CmmTop]) setSRT cafs topCAFMap topSRT t = do (topSRT, cafTable, srt) <- buildSRTs topSRT topCAFMap cafs let t' = updInfo id (const srt) t case cafTable of - Just tbl -> return (topSRT, [t', NoInfoTable tbl]) + Just tbl -> return (topSRT, [t', tbl]) Nothing -> return (topSRT, [t']) -updInfo :: (StackLayout -> StackLayout) -> (C_SRT -> C_SRT) -> - CmmTopForInfoTables -> CmmTopForInfoTables -updInfo toVars toSrt (ProcInfoTable (CmmProc info top_l top_args g) procpoints) = - ProcInfoTable (CmmProc (updInfoTbl toVars toSrt info) top_l top_args g) procpoints -updInfo toVars toSrt (FloatingInfoTable info bid updfr_off) = - FloatingInfoTable (updInfoTbl toVars toSrt info) bid updfr_off -updInfo _ _ (NoInfoTable _) = panic "can't update NoInfoTable" -updInfo _ _ _ = panic "unexpected arg to updInfo" - -updInfoTbl :: (StackLayout -> StackLayout) -> (C_SRT -> C_SRT) -> CmmInfo -> CmmInfo -updInfoTbl toVars toSrt (CmmInfo gc upd_fr (CmmInfoTable s p t typeinfo)) - = CmmInfo gc upd_fr (CmmInfoTable s p t typeinfo') +updInfo :: (StackLayout -> StackLayout) -> (C_SRT -> C_SRT) -> CmmTop -> CmmTop +updInfo toVars toSrt (CmmProc top_info top_l g) = + CmmProc (top_info {info_tbl=updInfoTbl toVars toSrt (info_tbl top_info)}) top_l g +updInfo _ _ t = t + +updInfoTbl :: (StackLayout -> StackLayout) -> (C_SRT -> C_SRT) -> CmmInfoTable -> CmmInfoTable +updInfoTbl toVars toSrt (CmmInfoTable s p t typeinfo) + = CmmInfoTable s p t typeinfo' where typeinfo' = case typeinfo of t@(ConstrInfo _ _ _) -> t (FunInfo c s a d e) -> FunInfo c (toSrt s) a d e (ThunkInfo c s) -> ThunkInfo c (toSrt s) (ThunkSelectorInfo x s) -> ThunkSelectorInfo x (toSrt s) (ContInfo v s) -> ContInfo (toVars v) (toSrt s) -updInfoTbl _ _ t@(CmmInfo _ _ CmmNonInfoTable) = t +updInfoTbl _ _ t@CmmNonInfoTable = t --- Lower the CmmTopForInfoTables type down to good old CmmTopZ --- by emitting info tables as data where necessary. -finishInfoTables :: CmmTopForInfoTables -> IO [CmmTopZ] -finishInfoTables (NoInfoTable t) = return [t] -finishInfoTables (ProcInfoTable p _) = return [p] -finishInfoTables (FloatingInfoTable (CmmInfo _ _ infotbl) bid _) = - do uniq_supply <- mkSplitUniqSupply 'i' - return $ mkBareInfoTable (retPtLbl bid) (uniqFromSupply uniq_supply) infotbl - ---------------------------------------------------------------- --- Safe foreign calls: --- Our analyses capture the dataflow facts at block boundaries, but we need --- to extend the CAF and live-slot analyses to safe foreign calls as well, --- which show up as middle nodes. -extendEnvWithSafeForeignCalls :: - BackwardTransfers Middle Last a -> BlockEnv a -> CmmGraph -> BlockEnv a -extendEnvWithSafeForeignCalls transfers env g = fold_blocks block env g - where block b z = - tail (bt_last_in transfers l (lookup env)) z head - where (head, last) = goto_end (G.unzip b) - l = case last of LastOther l -> l - LastExit -> panic "extendEnvs lastExit" - tail _ z (ZFirst _) = z - tail fact env (ZHead h m@(MidForeignCall (Safe bid _ _) _ _ _)) = - tail (mid m fact) (extendBlockEnv env bid fact) h - tail fact env (ZHead h m) = tail (mid m fact) env h - lookup map k = expectJust "extendEnvWithSafeFCalls" $ lookupBlockEnv map k - mid = bt_middle_in transfers - - -extendEnvsForSafeForeignCalls :: CAFEnv -> SlotEnv -> CmmGraph -> (CAFEnv, SlotEnv) -extendEnvsForSafeForeignCalls cafEnv slotEnv g = - fold_blocks block (cafEnv, slotEnv) g - where block b z = - tail ( bt_last_in cafTransfers l (lookupFn cafEnv) - , bt_last_in liveSlotTransfers l (lookupFn slotEnv)) - z head - where (head, last) = goto_end (G.unzip b) - l = case last of LastOther l -> l - LastExit -> panic "extendEnvs lastExit" - tail _ z (ZFirst _) = z - tail lives@(cafs, slots) (cafEnv, slotEnv) - (ZHead h m@(MidForeignCall (Safe bid _ _) _ _ _)) = - let slots' = removeLiveSlotDefs slots m - slotEnv' = extendBlockEnv slotEnv bid slots' - cafEnv' = extendBlockEnv cafEnv bid cafs - in tail (upd lives m) (cafEnv', slotEnv') h - tail lives z (ZHead h m) = tail (upd lives m) z h - lookupFn map k = expectJust "extendEnvsForSafeFCalls" $ lookupBlockEnv map k - upd (cafs, slots) m = - (bt_middle_in cafTransfers m cafs, bt_middle_in liveSlotTransfers m slots) - -- Safe foreign calls: We need to insert the code that suspends and resumes -- the thread before and after a safe foreign call. -- Why do we do this so late in the pipeline? @@ -502,96 +424,72 @@ extendEnvsForSafeForeignCalls cafEnv slotEnv g = -- a procpoint. The following datatype captures the information -- needed to generate the infotables along with the Cmm data and procedures. -data CmmTopForInfoTables - = NoInfoTable CmmTopZ -- must be CmmData - | ProcInfoTable CmmTopZ BlockSet -- CmmProc; argument is its set of procpoints - | FloatingInfoTable CmmInfo BlockId UpdFrameOffset -instance Outputable CmmTopForInfoTables where - ppr (NoInfoTable t) = text "NoInfoTable: " <+> ppr t - ppr (ProcInfoTable t bids) = text "ProcInfoTable: " <+> ppr t <+> ppr bids - ppr (FloatingInfoTable info bid upd) = - text "FloatingInfoTable: " <+> ppr info <+> ppr bid <+> ppr upd - --- The `safeState' record collects the info we update while lowering the --- safe foreign calls in the graph. -data SafeState = State { s_blocks :: BlockEnv CmmBlock - , s_pps :: ProcPointSet - , s_safeCalls :: [CmmTopForInfoTables]} - -lowerSafeForeignCalls - :: [[CmmTopForInfoTables]] -> CmmTopZ -> FuelMonad [[CmmTopForInfoTables]] -lowerSafeForeignCalls rst t@(CmmData _ _) = return $ [NoInfoTable t] : rst -lowerSafeForeignCalls rst (CmmProc info l args (off, g@(LGraph entry _))) = do - let init = return $ State emptyBlockEnv emptyBlockSet [] - let block b@(Block bid _) z = do - state@(State {s_pps = ppset, s_blocks = blocks}) <- z - let ppset' = if bid == entry then extendBlockSet ppset bid else ppset - state' = state { s_pps = ppset' } - if hasSafeForeignCall b - then lowerSafeCallBlock state' b - else return (state' { s_blocks = insertBlock b blocks }) - State blocks' g_procpoints safeCalls <- fold_blocks block init g - let proc = (CmmProc info l args (off, LGraph entry blocks')) - procTable = case off of - (_, Just _) -> [ProcInfoTable proc g_procpoints] - _ -> [NoInfoTable proc] -- not a successor of a call - return $ safeCalls : procTable : rst - --- Check for foreign calls -- if none, then we can avoid copying the block. -hasSafeForeignCall :: CmmBlock -> Bool -hasSafeForeignCall (Block _ t) = tail t - where tail (ZTail (MidForeignCall (Safe _ _ _) _ _ _) _) = True - tail (ZTail _ t) = tail t - tail (ZLast _) = False - --- Lower each safe call in the block, update the CAF and slot environments --- to include each of those calls, and insert the new block in the blockEnv. -lowerSafeCallBlock :: SafeState-> CmmBlock -> FuelMonad SafeState -lowerSafeCallBlock state b = tail (return state) (ZBlock head (ZLast last)) - where (head, last) = goto_end (G.unzip b) - tail s b@(ZBlock (ZFirst _) _) = - do state <- s - return $ state { s_blocks = insertBlock (G.zip b) (s_blocks state) } - tail s (ZBlock (ZHead h m@(MidForeignCall (Safe bid updfr_off _) _ _ _)) t) = - do state <- s - let state' = state - { s_safeCalls = FloatingInfoTable emptyContInfoTable bid updfr_off : - s_safeCalls state } - (state'', t') <- lowerSafeForeignCall state' m t - tail (return state'') (ZBlock h t') - tail s (ZBlock (ZHead h m) t) = tail s (ZBlock h (ZTail m t)) - +-- JD: Why not do this while splitting procedures? +lowerSafeForeignCalls :: AreaMap -> CmmTop -> FuelUniqSM CmmTop +lowerSafeForeignCalls _ t@(CmmData _ _) = return t +lowerSafeForeignCalls areaMap (CmmProc info l g@(CmmGraph {g_entry=entry})) = do + let block b mblocks = mblocks >>= lowerSafeCallBlock entry areaMap b + blocks <- foldGraphBlocks block (return mapEmpty) g + return $ CmmProc info l (ofBlockMap entry blocks) + +-- If the block ends with a safe call in the block, lower it to an unsafe +-- call (with appropriate saves and restores before and after). +lowerSafeCallBlock :: BlockId -> AreaMap -> CmmBlock -> BlockEnv CmmBlock + -> FuelUniqSM (BlockEnv CmmBlock) +lowerSafeCallBlock entry areaMap b blocks = + case blockToNodeList b of + (JustC (CmmEntry id), m, JustC l@(CmmForeignCall {})) -> lowerSafeForeignCall entry areaMap blocks id m l + _ -> return $ insertBlock b blocks -- Late in the code generator, we want to insert the code necessary -- to lower a safe foreign call to a sequence of unsafe calls. -lowerSafeForeignCall :: - SafeState -> Middle -> ZTail Middle Last -> FuelMonad (SafeState, ZTail Middle Last) -lowerSafeForeignCall state m@(MidForeignCall (Safe infotable _ interruptible) _ _ _) tail = do - let newTemp rep = getUniqueM >>= \u -> return (LocalReg u rep) +lowerSafeForeignCall :: BlockId -> AreaMap -> BlockEnv CmmBlock -> BlockId -> [CmmNode O O] -> CmmNode O C + -> FuelUniqSM (BlockEnv CmmBlock) +lowerSafeForeignCall entry areaMap blocks bid m + (CmmForeignCall {tgt=tgt, res=rs, args=as, succ=succ, updfr = updfr_off, intrbl = intrbl}) = + do let newTemp rep = getUniqueM >>= \u -> return (LocalReg u rep) -- Both 'id' and 'new_base' are KindNonPtr because they're -- RTS-only objects and are not subject to garbage collection id <- newTemp bWord new_base <- newTemp (cmmRegType (CmmGlobal BaseReg)) - let (caller_save, caller_load) = callerSaveVolatileRegs + let (caller_save, caller_load) = callerSaveVolatileRegs load_tso <- newTemp gcWord -- TODO FIXME NOW - let suspendThread = CmmLit (CmmLabel (mkCmmCodeLabel rtsPackageId (fsLit "suspendThread"))) - resumeThread = CmmLit (CmmLabel (mkCmmCodeLabel rtsPackageId (fsLit "resumeThread"))) - suspend = mkStore (CmmReg spReg) (CmmLit (CmmBlock infotable)) <*> - saveThreadState <*> - caller_save <*> + load_stack <- newTemp gcWord -- TODO FIXME NOW + let (<**>) = (M.<*>) + let suspendThread = foreignLbl "suspendThread" + resumeThread = foreignLbl "resumeThread" + foreignLbl name = CmmLit (CmmLabel (mkCmmCodeLabel rtsPackageId (fsLit name))) + suspend = saveThreadState <**> + caller_save <**> mkUnsafeCall (ForeignTarget suspendThread - (ForeignConvention CCallConv [AddrHint, NoHint] [AddrHint])) - -- XXX Not sure if the size of the CmmInt is correct - [id] [CmmReg (CmmGlobal BaseReg), CmmLit (CmmInt (fromIntegral (fromEnum interruptible)) wordWidth)] - resume = mkUnsafeCall (ForeignTarget resumeThread - (ForeignConvention CCallConv [AddrHint] [AddrHint])) - [new_base] [CmmReg (CmmLocal id)] <*> - -- Assign the result to BaseReg: we - -- might now have a different Capability! - mkAssign (CmmGlobal BaseReg) (CmmReg (CmmLocal new_base)) <*> - caller_load <*> - loadThreadState load_tso - Graph tail' blocks' <- - liftUniq (graphOfAGraph (suspend <*> mkMiddle m <*> resume <*> mkZTail tail)) - return (state {s_blocks = s_blocks state `plusBlockEnv` blocks'}, tail') -lowerSafeForeignCall _ _ _ = panic "lowerSafeForeignCall was passed something else" + (ForeignConvention CCallConv [AddrHint, NoHint] [AddrHint])) + [id] [CmmReg (CmmGlobal BaseReg), CmmLit (CmmInt (fromIntegral (fromEnum intrbl)) wordWidth)] + midCall = mkUnsafeCall tgt rs as + resume = mkUnsafeCall (ForeignTarget resumeThread + (ForeignConvention CCallConv [AddrHint] [AddrHint])) + [new_base] [CmmReg (CmmLocal id)] <**> + -- Assign the result to BaseReg: we + -- might now have a different Capability! + mkAssign (CmmGlobal BaseReg) (CmmReg (CmmLocal new_base)) <**> + caller_load <**> + loadThreadState load_tso load_stack + -- We have to save the return value on the stack because its next use + -- may appear in a different procedure due to procpoint splitting... + saveRetVals = foldl (<**>) emptyAGraph $ map (M.mkMiddle . spill) rs + spill r = CmmStore (regSlot r) (CmmReg $ CmmLocal r) + regSlot r@(LocalReg _ _) = CmmRegOff (CmmGlobal Sp) (sp_off - offset) + where offset = w + expectJust "lowerForeign" (Map.lookup (RegSlot r) areaMap) + sp_off = wORD_SIZE + expectJust "lowerForeign" (Map.lookup (CallArea area) areaMap) + area = if succ == entry then Old else Young succ + w = widthInBytes $ typeWidth $ localRegType r + -- Note: The successor must be a procpoint, and we have already split, + -- so we use a jump, not a branch. + succLbl = CmmLit (CmmLabel (infoTblLbl succ)) + jump = CmmCall { cml_target = succLbl, cml_cont = Nothing + , cml_args = widthInBytes wordWidth ,cml_ret_args = 0 + , cml_ret_off = updfr_off} + graph' <- liftUniq $ labelAGraph bid $ catAGraphs (map M.mkMiddle m) <**> + suspend <**> midCall <**> + resume <**> saveRetVals <**> M.mkLast jump + return $ blocks `mapUnion` toBlockMap graph' +lowerSafeForeignCall _ _ _ _ _ _ = panic "lowerSafeForeignCall was passed something else"