-{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedStrings #-}
-#include "debug.h"
module Mate.BasicBlocks(
BlockID,
BasicBlock,
BBEnd,
MapBB,
Method,
-#ifdef DBG_BB
printMapBB,
-#endif
parseMethod,
testCFG -- added by hs to perform benches from outside
)where
-import Data.Binary
+import Data.Binary hiding (get)
import Data.Int
-import Data.List
import qualified Data.Map as M
import qualified Data.ByteString.Lazy as B
import Data.Maybe
+import Control.Monad.State
+import Control.Applicative
+import Control.Arrow
import JVM.ClassFile
import JVM.Converter
import Mate.Debug
import Mate.Utilities
-#ifdef DEBUG
-import Text.Printf
-#endif
+-- (offset in bytecode, offset to jump target, ins)
+type OffIns = (Int, Maybe BBEnd, Instruction)
--- for immediate representation to determine BBs
-type Offset = (Int, Maybe BBEnd) -- (offset in bytecode, offset to jump target)
-type OffIns = (Offset, Instruction)
+type Targets = [BlockID]
+type BBState = Targets
+type AnalyseState = State BBState [OffIns]
-#ifdef DBG_BB
printMapBB :: MapBB -> IO ()
printMapBB hmap = do
- putStr "BlockIDs: "
+ printfBb "BlockIDs: "
let keys = M.keys hmap
- mapM_ (putStr . (flip (++)) ", " . show) keys
- putStrLn "\n\nBasicBlocks:"
+ mapM_ (printfBb . flip (++) ", " . show) keys
+ printfBb "\n\nBasicBlocks:\n"
printMapBB' keys hmap
where
printMapBB' :: [BlockID] -> MapBB -> IO ()
printMapBB' [] _ = return ()
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"
+ printfBb $ "Block " ++ show i ++ "\n"
+ mapM_ (printfBb . flip (++) "\n" . (++) "\t" . show) $ code bb
+ printfBb $ case successor bb of
+ Return -> ""
+ FallThrough t1 -> "Sucessor: " ++ show t1 ++ "\n"
+ OneTarget t1 -> "Sucessor: " ++ show t1 ++ "\n"
+ TwoTarget t1 t2 -> "Sucessor: " ++ show t1 ++ ", " ++ show t2 ++ "\n"
printMapBB' is hmap
Nothing -> error $ "BlockID " ++ show i ++ " not found."
-#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 = testInstance "./tests/While.class" "f"
test_03 = testInstance "./tests/While.class" "g"
test_04 = testInstance "./tests/Fac.class" "fac"
-#endif
-#endif
+-}
parseMethod :: Class Direct -> B.ByteString -> MethodSignature -> IO RawMethod
let mapbb = testCFG decoded
let locals = fromIntegral (codeMaxLocals decoded)
let stacks = fromIntegral (codeStackSize decoded)
+ let codelen = fromIntegral (codeLength decoded)
let methoddirect = methodInfoToMethod (MethodInfo methodname "" sig) cls
let isStatic = methodIsStatic methoddirect
let nametype = methodNameType methoddirect
let argscount = methodGetArgsCount nametype + (if isStatic then 0 else 1)
- let msig = methodSignature $ classMethods cls !! 1
- printfBb "BB: analysing \"%s\"\n" $ toString (methodname `B.append` ": " `B.append` encode msig)
-#ifdef DBG_BB
- case maybe_bb of
- Just m -> printMapBB $ rawMapBB m
- Nothing -> return ()
-#endif
+ let msig = methodSignature method
+ printfBb $ printf "BB: analysing \"%s\"\n" $ toString (methodname `B.append` ": " `B.append` encode msig)
+ printMapBB mapbb
-- small example how to get information about
-- exceptions of a method
-- TODO: remove ;-)
let (Just m) = lookupMethodSig methodname sig cls
case attrByName m "Code" of
Nothing ->
- printfBb "exception: no handler for this method\n"
+ printfBb $ printf "exception: no handler for this method\n"
Just exceptionstream ->
- printfBb "exception: \"%s\"\n" (show $ codeExceptions $ decodeMethod exceptionstream)
- return $ RawMethod mapbb locals stacks argscount
+ printfBb $ printf "exception: \"%s\"\n" (show $ codeExceptions $ decodeMethod exceptionstream)
+ return $ RawMethod mapbb locals stacks argscount codelen
testCFG :: Code -> MapBB
buildCFG xs = buildCFG' M.empty xs' xs'
where
xs' :: [OffIns]
- xs' = markBackwardTargets $ calculateInstructionOffset xs
+ xs' = evalState (calculateInstructionOffset xs >>= markBackwardTargets) []
-- 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
+markBackwardTargets :: [OffIns] -> AnalyseState
+markBackwardTargets [] = return []
+markBackwardTargets (x:[]) = return [x]
+markBackwardTargets (x@(x_off,x_bbend,x_ins):y@(y_off,_,_):xs) = do
+ rest <- markBackwardTargets (y:xs)
+ targets <- get
+ let isTarget = y_off `elem` targets
+ x_new = case x_bbend of
Just _ -> x -- already marked, don't change
- Nothing -> ((x_off, Just $ FallThrough w16), x_ins) -- mark previous insn
+ Nothing -> if isTarget then checkX y_off else x
+ checkX w16 = case x_bbend of
+ Nothing -> (x_off, Just $ FallThrough w16, x_ins) -- mark previous insn
+ _ -> error "basicblock: something is wrong"
+ return $ x_new:rest
- -- 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
+buildCFG' hmap ((off, entry, _):xs) insns = buildCFG' (insertlist entryi hmap) xs insns
where
insertlist :: [BlockID] -> MapBB -> MapBB
insertlist [] hmap' = hmap'
parseBasicBlock :: Int -> [OffIns] -> BasicBlock
parseBasicBlock i insns = BasicBlock insonly endblock
where
- startlist = dropWhile (\((x,_),_) -> x < i) insns
- (Just ((_, Just endblock),_), is) = takeWhilePlusOne validins startlist
- insonly = snd $ unzip is
+ (lastblock, is) = takeWhilePlusOne validins omitins insns
+ (_, _, insonly) = unzip3 is
+ (_, Just endblock, _) = fromJust lastblock
-- 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)
- | otherwise = (Just x,[x])
+ takeWhilePlusOne :: (a -> Bool) -> (a -> Bool) -> [a] -> (Maybe a, [a])
+ takeWhilePlusOne _ _ [] = (Nothing, [])
+ takeWhilePlusOne p omit (x:xs)
+ | omit x = next
+ | p x = second (x:) next
+ | otherwise = (Just x, [x])
+ where
+ next = takeWhilePlusOne p omit xs
- validins :: ((Int, Maybe BBEnd), Instruction) -> Bool
- validins ((_,x),_) = case x of Just _ -> False; Nothing -> True
+ validins :: OffIns -> Bool
+ validins (_, x, _) = isNothing x
+ omitins :: OffIns -> Bool
+ omitins (off, _, _) = off < i
-calculateInstructionOffset :: [Instruction] -> [OffIns]
-calculateInstructionOffset = cio' (0, Nothing)
- where
- newoffset :: Instruction -> Int -> Offset
- newoffset x off = (off + fromIntegral (B.length $ encodeInstructions [x]), Nothing)
+calculateInstructionOffset :: [Instruction] -> AnalyseState
+calculateInstructionOffset = cio' (0, Nothing, NOP)
+ where
addW16Signed :: Int -> Word16 -> Int
addW16Signed i w16 = i + fromIntegral s16
where s16 = fromIntegral w16 :: Int16
- cio' :: Offset -> [Instruction] -> [OffIns]
- cio' _ [] = []
- -- TODO(bernhard): add more instruction with offset (IF_ACMP, JSR, ...)
- cio' (off,_) (x:xs) = case x of
+ cio' :: OffIns -> [Instruction] -> AnalyseState
+ cio' _ [] = return $ []
+ cio' (off,_,_) (x:xs) = case x of
IF _ w16 -> twotargets w16
IF_ICMP _ w16 -> twotargets w16
IF_ACMP _ w16 -> twotargets w16
IRETURN -> notarget
ARETURN -> notarget
RETURN -> notarget
- _ -> ((off, Nothing), x):next
+ _ -> ((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 + 3) (off `addW16Signed` w16)), x):next
- next = cio' (newoffset x off) xs
+ notarget = ((off, Just Return, x):) <$> next
+ onetarget w16 = do
+ let jump = off `addW16Signed` w16
+ modify (jump:)
+ ((off, Just $ OneTarget jump, x):) <$> next
+ twotargets w16 = do
+ let nojump = off + 3
+ modify (nojump:)
+ let jump = off `addW16Signed` w16
+ modify (jump:)
+ ((off, Just $ TwoTarget nojump jump, x):) <$> next
+ next = cio' newoffset xs
+ newoffset = (off + insnLength x, Nothing, NOP)
+
+-- TODO(bernhard): does GHC memomize results? i.e. does it calculate the size
+-- of `NOP' only once?
+insnLength :: Num a => Instruction -> a
+insnLength = fromIntegral . B.length . encodeInstructions . (:[])
projects / mate.git / blobdiff