X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fcmm%2FCmmBuildInfoTables.hs;h=0ba8cc0c514270cb0d22a8c9bb342a4157dbf10b;hb=7fc01c4671980ea3c66d549c0ece4d82fd3f5ade;hp=6b0df700c284b44a1aa489ef0bdf41295aea5fd4;hpb=984a288119983912d40a80845c674ee4b83a19ce;p=ghc-hetmet.git diff --git a/compiler/cmm/CmmBuildInfoTables.hs b/compiler/cmm/CmmBuildInfoTables.hs index 6b0df70..0ba8cc0 100644 --- a/compiler/cmm/CmmBuildInfoTables.hs +++ b/compiler/cmm/CmmBuildInfoTables.hs @@ -1,9 +1,17 @@ +#if __GLASGOW_HASKELL__ >= 611 +{-# OPTIONS_GHC -XNoMonoLocalBinds #-} +#endif +-- Norman likes local bindings +-- If this module lives on I'd like to get rid of this flag in due course + module CmmBuildInfoTables ( CAFSet, CAFEnv, CmmTopForInfoTables(..), cafAnal, localCAFInfo, mkTopCAFInfo , setInfoTableSRT, setInfoTableStackMap , TopSRT, emptySRT, srtToData , bundleCAFs - , finishInfoTables, lowerSafeForeignCalls, extendEnvsForSafeForeignCalls ) + , finishInfoTables, lowerSafeForeignCalls + , cafTransfers, liveSlotTransfers + , extendEnvWithSafeForeignCalls, extendEnvsForSafeForeignCalls ) where #include "HsVersions.h" @@ -23,6 +31,7 @@ import CmmProcPointZ import CmmStackLayout import CmmTx import DFMonad +import Module import FastString import FiniteMap import ForeignCall @@ -74,16 +83,35 @@ import ZipDataflow -- Also, don't forget to stop at the old end of the stack (oldByte), -- which may differ depending on whether there is an update frame. + +type RegSlotInfo + = ( Int -- Offset from oldest byte of Old area + , LocalReg -- The register + , Int) -- Width of the register + live_ptrs :: ByteOff -> BlockEnv SubAreaSet -> AreaMap -> BlockId -> [Maybe LocalReg] live_ptrs oldByte slotEnv areaMap bid = - -- pprTrace "live_ptrs for" (ppr bid <+> ppr youngByte <+> ppr liveSlots) $ - reverse $ slotsToList youngByte liveSlots [] - where slotsToList n [] results | n == oldByte = results -- at old end of stack frame + -- pprTrace "live_ptrs for" (ppr bid <+> text (show oldByte ++ "-" ++ show youngByte) <+> + -- ppr liveSlots) $ + -- pprTrace ("stack layout for " ++ show bid ++ ": ") (ppr res) $ res + res + where res = reverse $ slotsToList youngByte liveSlots [] + + slotsToList :: Int -> [RegSlotInfo] -> [Maybe LocalReg] -> [Maybe LocalReg] + -- n starts at youngByte and is decremented down to oldByte + -- Returns a list, one element per word, with + -- (Just r) meaning 'pointer register r is saved here', + -- Nothing meaning 'non-pointer or empty' + + slotsToList n [] results | n == oldByte = results -- at old end of stack frame + slotsToList n (s : _) _ | n == oldByte = pprPanic "slot left off live_ptrs" (ppr s <+> ppr oldByte <+> ppr n <+> ppr liveSlots <+> ppr youngByte) + slotsToList n _ _ | n < oldByte = panic "stack slots not allocated on word boundaries?" + slotsToList n l@((n', r, w) : rst) results = if n == (n' + w) then -- slot's young byte is at n ASSERT (not (isPtr r) || @@ -94,15 +122,20 @@ live_ptrs oldByte slotEnv areaMap bid = (Nothing : results) where next = n - wORD_SIZE stack_rep = if isPtr r then Just r else Nothing + slotsToList n [] results = slotsToList (n - wORD_SIZE) [] (Nothing : results) + non_ptr_younger_than next (n', r, w) = n' + w > next && ASSERT (not (isPtr r)) True isPtr = isGcPtrType . localRegType + + liveSlots :: [RegSlotInfo] liveSlots = sortBy (\ (off,_,_) (off',_,_) -> compare off' off) (foldFM (\_ -> flip $ foldl add_slot) [] slots) + add_slot :: [RegSlotInfo] -> SubArea -> [RegSlotInfo] add_slot rst (a@(RegSlot r@(LocalReg _ ty)), off, w) = if off == w && widthInBytes (typeWidth ty) == w then (expectJust "add_slot" (lookupFM areaMap a), r, w) : rst @@ -119,6 +152,8 @@ live_ptrs oldByte slotEnv areaMap bid = -- IN THE CALL NODES, WHICH SHOULD EVENTUALLY HAVE LIVE REGISTER AS WELL, -- SO IT'S ALL GOING IN THE SAME DIRECTION. -- 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 youngByte = expectJust "live_ptrs bid_pos" $ lookupFM areaMap (CallArea (Young bid)) @@ -229,6 +264,8 @@ buildSRTs topSRT topCAFMap cafs = do let liftCAF lbl () z = -- get CAFs for functions without static closures case lookupFM topCAFMap lbl of Just cafs -> z `plusFM` cafs Nothing -> addToFM z lbl () + -- For each label referring to a function f without a static closure, + -- replace it with the CAFs that are reachable from f. sub_srt topSRT localCafs = let cafs = keysFM (foldFM liftCAF emptyFM localCafs) mkSRT topSRT = @@ -302,7 +339,7 @@ to_SRT top_srt off len bmp -- doesn't have a static closure. -- (If it has a static closure, it will already have an SRT to -- keep its CAFs live.) --- Any procedure referring to a non-static CAF c must keep live the +-- 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 _ (CmmData _ _) = Nothing @@ -346,7 +383,7 @@ type StackLayout = [Maybe LocalReg] bundleCAFs :: CAFEnv -> CmmTopForInfoTables -> (CAFSet, CmmTopForInfoTables) bundleCAFs cafEnv t@(ProcInfoTable _ procpoints) = case blockSetToList procpoints of - [bid] -> (expectJust "bundleCAFs " (lookupBlockEnv cafEnv bid), t) + [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 _) = @@ -408,6 +445,22 @@ finishInfoTables (FloatingInfoTable (CmmInfo _ _ infotbl) bid _) = -- 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 @@ -496,7 +549,7 @@ lowerSafeCallBlock state b = tail (return state) (ZBlock head (ZLast last)) 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) = + 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 : @@ -518,8 +571,8 @@ lowerSafeForeignCall state m@(MidForeignCall (Safe infotable _) _ _ _) tail = do new_base <- newTemp (cmmRegType (CmmGlobal BaseReg)) let (caller_save, caller_load) = callerSaveVolatileRegs load_tso <- newTemp gcWord -- TODO FIXME NOW - let suspendThread = CmmLit (CmmLabel (mkRtsCodeLabel (fsLit "suspendThread"))) - resumeThread = CmmLit (CmmLabel (mkRtsCodeLabel (fsLit "resumeThread"))) + 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 <*>