let nametype = methodNameType methoddirect
let argscount = methodGetArgsCount nametype + (if isStatic then 0 else 1)
- let msig = methodSignature method
- printfBb $ printf "BB: analysing \"%s\"\n" $ toString (methodname `B.append` ": " `B.append` encode msig)
- printMapBB mapbb
+ -- TODO: remove ;-)
-- 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 $ printf "exception: no handler for this method\n"
Just exceptionstream ->
printfBb $ printf "exception: \"%s\"\n" (show $ codeExceptions $ decodeMethod exceptionstream)
+ -- [/remove]
+ let msig = methodSignature method
+ printfBb $ printf "BB: analysing \"%s\"\n" $ toString (methodname `B.append` ": " `B.append` encode msig)
+ printMapBB mapbb
return $ RawMethod mapbb locals stacks argscount codelen
testCFG :: Code -> MapBB
-testCFG = buildCFG . codeInstructions
+testCFG c = buildCFG (codeInstructions c) (codeExceptions c)
-buildCFG :: [Instruction] -> MapBB
-buildCFG xs = execState (mapM (buildCFG' offins) alltargets) M.empty
+buildCFG :: [Instruction] -> [CodeException] -> MapBB
+buildCFG xs excps = execState (mapM (buildCFG' offins) $ alltargets ++ handlerEntries) M.empty
where
- (offins, targets) = runState (calculateInstructionOffset xs) S.empty
+ (offins, targets) = runState (calculateInstructionOffset tryBlocks xs) S.empty
alltargets = S.toList $ S.insert 0 targets
+ tryBlocks = map (fromIntegral . eStartPC) excps
+ handlerEntries = map (fromIntegral . eHandlerPC) excps
buildCFG' :: [OffIns] -> Int -> State MapBB ()
buildCFG' insns off = do
omitins (off, _, _) = off < i
-calculateInstructionOffset :: [Instruction] -> AnalyseState
-calculateInstructionOffset = cio' (0, Nothing, NOP)
+calculateInstructionOffset :: [BlockID] -> [Instruction] -> AnalyseState
+calculateInstructionOffset exstarts = cio' 0
where
- addW16Signed :: Int -> Word16 -> Int
addW16Signed i w16 = i + fromIntegral s16
where s16 = fromIntegral w16 :: Int16
- cio' :: OffIns -> [Instruction] -> AnalyseState
+ cio' :: Int -> [Instruction] -> AnalyseState
cio' _ [] = return $ []
- cio' (off,_,_) (x:xs) = case x of
+ 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
+ ATHROW -> notarget
IRETURN -> notarget
ARETURN -> notarget
RETURN -> notarget
- _ -> normalins
+ _ -> if newoffset `elem` exstarts
+ then do
+ modify (S.insert newoffset)
+ ((off, Just $ OneTarget newoffset, x):) <$> next
+ else normalins
where
normalins = do
tailinsns <- next -- eval remaining instructions
let jump = off `addW16Signed` w16
modify (S.insert jump)
((off, Just $ TwoTarget nojump jump, x):) <$> next
- next = cio' nextins xs
- nextins = (newoffset, Nothing, NOP)
- newoffset = off + insnLength x
+ next = cio' newoffset xs
+ newoffset = off + insLen
+ insLen = insnLength x
-- TODO(bernhard): does GHC memomize results? i.e. does it calculate the size
-- of `NOP' only once?