X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=Mate%2FBasicBlocks.hs;h=fbb61f7a06ecf6a471d5b33385953f58228ee19b;hb=f82dbecc763818452667ac568da96b7c5dd7cc97;hp=fdb6b22ab02994a1fa43ad03a236258c23796e6e;hpb=b35a0fda794488560aa723397dd5c5bfdd2dca95;p=mate.git diff --git a/Mate/BasicBlocks.hs b/Mate/BasicBlocks.hs index fdb6b22..fbb61f7 100644 --- a/Mate/BasicBlocks.hs +++ b/Mate/BasicBlocks.hs @@ -1,137 +1,177 @@ +{-# LANGUAGE CPP #-} {-# LANGUAGE OverloadedStrings #-} +#include "debug.h" module Mate.BasicBlocks( BlockID, BasicBlock (..), BBEnd (..), MapBB, +#ifdef DBG_BB printMapBB, - parseMethod +#endif + parseMethod, + testCFG -- added by hs to perform benches from outside )where import Data.Binary import Data.Int -import qualified Data.Map as H -import System.Environment +import Data.List import qualified Data.Map as M import qualified Data.ByteString.Lazy as B -import JVM.Common import JVM.ClassFile import JVM.Converter -import JVM.Dump import JVM.Assembler -import Debug.Trace - +import Mate.Types +import Mate.Debug import Mate.Utilities -type Name = String -- use "virtual register id" instead? -data Type = JInt | JFloat -- add more -type Variable = (Type,Name) - -type BlockID = Int --- Represents a CFG node -data BasicBlock = BasicBlock { - -- inputs :: [Variable], - -- outputs :: [Variable], - code :: [Instruction], - successor :: BBEnd } - --- describes (leaving) edges of a CFG node -data BBEnd = Return | OneTarget BlockID | TwoTarget BlockID BlockID deriving Show - -type MapBB = H.Map BlockID BasicBlock +#ifdef DEBUG +import Text.Printf +#endif --- for immediate representation for determine BBs +-- for immediate representation to determine BBs type Offset = (Int, Maybe BBEnd) -- (offset in bytecode, offset to jump target) type OffIns = (Offset, Instruction) +#ifdef DBG_BB printMapBB :: Maybe MapBB -> IO () printMapBB Nothing = putStrLn "No BasicBlock" printMapBB (Just hmap) = do putStr "BlockIDs: " - let keys = fst $ unzip $ H.toList hmap + let keys = M.keys hmap mapM_ (putStr . (flip (++)) ", " . show) keys putStrLn "\n\nBasicBlocks:" printMapBB' keys hmap where printMapBB' :: [BlockID] -> MapBB -> IO () printMapBB' [] _ = return () - printMapBB' (i:is) hmap = case H.lookup i hmap of + printMapBB' (i:is) hmap' = case M.lookup i hmap' of Just bb -> do putStrLn $ "Block " ++ (show i) mapM_ putStrLn (map ((++) "\t" . show) $ code bb) case successor bb of Return -> putStrLn "" + FallThrough t1 -> putStrLn $ "Sucessor: " ++ (show t1) ++ "\n" OneTarget t1 -> putStrLn $ "Sucessor: " ++ (show t1) ++ "\n" TwoTarget t1 t2 -> putStrLn $ "Sucessor: " ++ (show t1) ++ ", " ++ (show t2) ++ "\n" printMapBB' is hmap Nothing -> error $ "BlockID " ++ show i ++ " not found." - -testInstance :: String -> B.ByteString -> IO () -testInstance cf method = do - hmap <- parseMethod cf method +#endif + +#if 0 +#ifdef DBG_BB +testInstance :: String -> B.ByteString -> MethodSignature -> IO () +testInstance cf method sig = do + cls <- parseClassFile cf + hmap <- parseMethod cls method sig printMapBB hmap +#endif + +#ifdef DBG_BB +test_main :: IO () +test_main = do + test_01 + test_02 + test_03 + test_04 +test_01, test_02, test_03, test_04 :: IO () test_01 = testInstance "./tests/Fib.class" "fib" test_02 = testInstance "./tests/While.class" "f" test_03 = testInstance "./tests/While.class" "g" - - -parseMethod :: String -> B.ByteString -> IO (Maybe MapBB) -parseMethod clspath method = do - cls <- parseClassFile clspath - return $ testCFG $ lookupMethod method cls - - -testCFG :: Maybe (Method Resolved) -> Maybe MapBB -testCFG (Just m) = case attrByName m "Code" of - Nothing -> Nothing - Just bytecode -> let code = decodeMethod bytecode - instructions = codeInstructions code - in Just $ buildCFG instructions -testCFG _ = Nothing +test_04 = testInstance "./tests/Fac.class" "fac" +#endif +#endif + + +parseMethod :: Class Direct -> B.ByteString -> MethodSignature -> IO (Maybe MapBB) +parseMethod cls method sig = do + let maybe_bb = testCFG $ lookupMethodSig method sig cls + let msig = methodSignature $ classMethods cls !! 1 + printfBb "BB: analysing \"%s\"\n" $ toString (method `B.append` ": " `B.append` encode msig) +#ifdef DBG_BB + printMapBB maybe_bb +#endif + -- small example how to get information about + -- exceptions of a method + -- TODO: remove ;-) + let (Just m) = lookupMethodSig method sig cls + case attrByName m "Code" of + Nothing -> printfBb "exception: no handler for this method\n" + Just exceptionstream -> printfBb "exception: \"%s\"\n" (show $ codeExceptions $ decodeMethod exceptionstream) + return maybe_bb + + +testCFG :: Maybe (Method Direct) -> Maybe MapBB +testCFG m = do + m' <- m + bytecode <- attrByName m' "Code" + return $ buildCFG $ codeInstructions $ decodeMethod bytecode buildCFG :: [Instruction] -> MapBB -buildCFG xs = buildCFG' H.empty xs' xs' +buildCFG xs = buildCFG' M.empty xs' xs' where xs' :: [OffIns] - xs' = calculateInstructionOffset xs + xs' = markBackwardTargets $ calculateInstructionOffset xs + +-- get already calculated jmp-targets and mark the predecessor of the +-- target-instruction as "FallThrough". we just care about backwards +-- jumps here (forward jumps are handled in buildCFG') +markBackwardTargets :: [OffIns] -> [OffIns] +markBackwardTargets [] = [] +markBackwardTargets (x:[]) = [x] +markBackwardTargets insns@(x@((x_off,x_bbend),x_ins):y@((y_off,_),_):xs) = + x_new:markBackwardTargets (y:xs) + where + x_new = if isTarget then checkX y_off else x + checkX w16 = case x_bbend of + Just _ -> x -- already marked, don't change + Nothing -> ((x_off, Just $ FallThrough w16), x_ins) -- mark previous insn + + -- look through all remaining insns in the stream if there is a jmp to `y' + isTarget = case find cmpOffset insns of Just _ -> True; Nothing -> False + cmpOffset ((_,Just (OneTarget w16)),_) = w16 == y_off + cmpOffset ((_,Just (TwoTarget _ w16)),_) = w16 == y_off + cmpOffset _ = False + buildCFG' :: MapBB -> [OffIns] -> [OffIns] -> MapBB buildCFG' hmap [] _ = hmap buildCFG' hmap (((off, entry), _):xs) insns = buildCFG' (insertlist entryi hmap) xs insns where insertlist :: [BlockID] -> MapBB -> MapBB - insertlist [] hmap = hmap - insertlist (x:xs) hmap = insertlist xs newhmap + insertlist [] hmap' = hmap' + insertlist (y:ys) hmap' = insertlist ys newhmap where - newhmap = if H.member x hmap then hmap else H.insert x value hmap - value = parseBasicBlock x insns + newhmap = if M.member y hmap' then hmap' else M.insert y value hmap' + value = parseBasicBlock y insns entryi :: [BlockID] - entryi = (if off == 0 then [0] else []) ++ -- also consider the entrypoint - case entry of - Just (TwoTarget t1 t2) -> [t1, t2] - Just (OneTarget t) -> [t] - Just (Return) -> [] - Nothing -> [] + entryi = if off == 0 then 0:ys else ys -- also consider the entrypoint + where ys = case entry of + Just (TwoTarget t1 t2) -> [t1, t2] + Just (OneTarget t) -> [t] + Just (FallThrough t) -> [t] + Just Return -> [] + Nothing -> [] parseBasicBlock :: Int -> [OffIns] -> BasicBlock parseBasicBlock i insns = BasicBlock insonly endblock where startlist = dropWhile (\((x,_),_) -> x < i) insns - (Just ((_,(Just endblock)),_), is) = takeWhilePlusOne validins startlist + (Just ((_, Just endblock),_), is) = takeWhilePlusOne validins startlist insonly = snd $ unzip is -- also take last (non-matched) element and return it takeWhilePlusOne :: (a -> Bool) -> [a] -> (Maybe a,[a]) takeWhilePlusOne _ [] = (Nothing,[]) takeWhilePlusOne p (x:xs) - | p x = let (lastins, list) = takeWhilePlusOne p xs in (lastins, (x:list)) + | p x = let (lastins, list) = takeWhilePlusOne p xs in (lastins, x:list) | otherwise = (Just x,[x]) validins :: ((Int, Maybe BBEnd), Instruction) -> Bool @@ -142,11 +182,11 @@ calculateInstructionOffset :: [Instruction] -> [OffIns] calculateInstructionOffset = cio' (0, Nothing) where newoffset :: Instruction -> Int -> Offset - newoffset x off = (off + (fromIntegral $ B.length $ encodeInstructions [x]), Nothing) + newoffset x off = (off + fromIntegral (B.length $ encodeInstructions [x]), Nothing) addW16Signed :: Int -> Word16 -> Int - addW16Signed i w16 = i + (fromIntegral s16) - where s16 = (fromIntegral w16) :: Int16 + addW16Signed i w16 = i + fromIntegral s16 + where s16 = fromIntegral w16 :: Int16 cio' :: Offset -> [Instruction] -> [OffIns] cio' _ [] = [] @@ -154,11 +194,16 @@ calculateInstructionOffset = cio' (0, Nothing) cio' (off,_) (x:xs) = case x of IF _ w16 -> twotargets w16 IF_ICMP _ w16 -> twotargets w16 + IF_ACMP _ w16 -> twotargets w16 + IFNONNULL w16 -> twotargets w16 + IFNULL w16 -> twotargets w16 GOTO w16 -> onetarget w16 IRETURN -> notarget + ARETURN -> notarget + RETURN -> notarget _ -> ((off, Nothing), x):next where notarget = ((off, Just Return), x):next - onetarget w16 = ((off, Just $ OneTarget $ (off `addW16Signed` w16)), x):next - twotargets w16 = ((off, Just $ TwoTarget (off `addW16Signed` w16) (off + 3)), x):next + onetarget w16 = ((off, Just $ OneTarget (off `addW16Signed` w16)), x):next + twotargets w16 = ((off, Just $ TwoTarget (off + 3) (off `addW16Signed` w16)), x):next next = cio' (newoffset x off) xs