import qualified Data.Map as M
import qualified Data.ByteString.Lazy as B
import Data.Maybe
+import Control.Monad.State
import JVM.ClassFile
import JVM.Converter
import Mate.Debug
import Mate.Utilities
--- for immediate representation to determine BBs
-type Offset = (Int, Maybe BBEnd) -- (offset in bytecode, offset to jump target)
-type OffIns = (Offset, Instruction)
+-- (offset in bytecode, offset to jump target, ins)
+type OffIns = (Int, Maybe BBEnd, Instruction)
+
+type Targets = [BlockID]
+type BBState = Targets
+type AnalyseState = State BBState [OffIns]
printMapBB :: MapBB -> IO ()
markBackwardTargets :: [OffIns] -> [OffIns]
markBackwardTargets [] = []
markBackwardTargets (x:[]) = [x]
-markBackwardTargets insns@(x@((x_off,x_bbend),x_ins):y@((y_off,_),_):xs) =
+markBackwardTargets insns@(x@(x_off,x_bbend,x_ins):y@(y_off,_,_):xs) =
x_new:markBackwardTargets (y:xs)
where
x_new = case x_bbend of
Just _ -> x -- already marked, don't change
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
+ Nothing -> (x_off, Just $ FallThrough w16, x_ins) -- mark previous insn
_ -> error "basicblock: something is wrong"
-- 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 (_,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
+ startlist = dropWhile (\(x,_,_) -> x < i) insns
+ (Just (_, Just endblock, _), is) = takeWhilePlusOne validins startlist
+ (_, _, insonly) = unzip3 is
-- also take last (non-matched) element and return it
takeWhilePlusOne :: (a -> Bool) -> [a] -> (Maybe a,[a])
| p x = let (lastins, list) = takeWhilePlusOne p xs in (lastins, x:list)
| otherwise = (Just x,[x])
- validins :: ((Int, Maybe BBEnd), Instruction) -> Bool
- validins ((_,x),_) = case x of Just _ -> False; Nothing -> True
+ validins :: (Int, Maybe BBEnd, Instruction) -> Bool
+ validins (_,x,_) = case x of Just _ -> False; Nothing -> True
calculateInstructionOffset :: [Instruction] -> [OffIns]
-calculateInstructionOffset = cio' (0, Nothing)
+calculateInstructionOffset = cio' (0, Nothing, NOP)
where
- newoffset :: Instruction -> Int -> Offset
- newoffset x off = (off + fromIntegral (B.length $ encodeInstructions [x]), Nothing)
+ newoffset :: Instruction -> Int -> OffIns
+ newoffset x off = (off + fromIntegral (B.length $ encodeInstructions [x]), Nothing, NOP)
addW16Signed :: Int -> Word16 -> Int
addW16Signed i w16 = i + fromIntegral s16
where s16 = fromIntegral w16 :: Int16
- cio' :: Offset -> [Instruction] -> [OffIns]
+ cio' :: OffIns -> [Instruction] -> [OffIns]
cio' _ [] = []
-- TODO(bernhard): add more instruction with offset (IF_ACMP, JSR, ...)
- 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
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
+ 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