{-# LANGUAGE OverloadedStrings #-}
-module Mate.BasicBlocks where
+module Mate.BasicBlocks(
+ BlockID,
+ BasicBlock (..),
+ BBEnd (..),
+ MapBB,
+ printMapBB,
+ parseMethod
+ )where
import Data.Binary
+import Data.Int
+import qualified Data.Map as H
import System.Environment
import qualified Data.Map as M
import qualified Data.ByteString.Lazy as B
import JVM.Dump
import JVM.Assembler
+import Debug.Trace
+
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] }
+ -- inputs :: [Variable],
+ -- outputs :: [Variable],
+ code :: [Instruction],
+ successor :: BBEnd }
--- Represents a Control-Flow-Graph as
--- Adjacency list (add matrix representation if appropriate)
-type CFList = [(BasicBlock, [BasicBlock])]
+-- describes (leaving) edges of a CFG node
+data BBEnd = Return | OneTarget BlockID | TwoTarget BlockID BlockID deriving Show
+type MapBB = H.Map BlockID BasicBlock
-main = do
- args <- getArgs
- case args of
- [clspath] -> parseFile clspath "fib" -- TODO
- _ -> error "Synopsis: dump-class File.class"
+-- for immediate representation for determine BBs
+type Offset = (Int, Maybe BBEnd) -- (offset in bytecode, offset to jump target)
+type OffIns = (Offset, Instruction)
-parseFile :: String -> B.ByteString -> IO ()
-parseFile clspath method = do
- --clsFile <- decodeFile clspath
- --putStrLn $ showListIx $ M.assocs $ constsPool (clsFile :: Class Pointers)
+printMapBB :: Maybe MapBB -> IO ()
+printMapBB Nothing = putStrLn "No BasicBlock"
+printMapBB (Just hmap) = do
+ putStr "BlockIDs: "
+ let keys = fst $ unzip $ H.toList 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
+ Just bb -> do
+ putStrLn $ "Block " ++ (show i)
+ mapM_ putStrLn (map ((++) "\t" . show) $ code bb)
+ case successor bb of
+ Return -> putStrLn ""
+ 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
+ printMapBB hmap
+
+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
- --dumpClass cls
- let mainmethod = lookupMethod method cls -- "main|([Ljava/lang/String;)V" cf
- mapM_ putStrLn (testCFG mainmethod)
-
-test_01 = parseFile "./tests/Fib.class" "fib"
-test_02 = parseFile "./tests/While.class" "f"
-test_03 = parseFile "./tests/While.class" "g"
+ return $ testCFG $ lookupMethod method cls
-testCFG :: Maybe (Method Resolved) -> [String]
+testCFG :: Maybe (Method Resolved) -> Maybe MapBB
testCFG (Just m) = case attrByName m "Code" of
- Nothing -> error "no code"
+ Nothing -> Nothing
Just bytecode -> let code = decodeMethod bytecode
instructions = codeInstructions code
- in buildCFG instructions
-testCFG _ = error "no method to build cfg"
+ in Just $ buildCFG instructions
+testCFG _ = Nothing
-buildCFG :: [Instruction] -> [String]
-buildCFG xs = map (\(x,y) -> show x ++ ", " ++ show y) xs'
+buildCFG :: [Instruction] -> MapBB
+buildCFG xs = buildCFG' H.empty xs' xs'
where
+ xs' :: [OffIns]
xs' = calculateInstructionOffset xs
-type Offset = Int
-calculateInstructionOffset :: [Instruction] -> [(Offset, Instruction)]
-calculateInstructionOffset = cio' 0
+buildCFG' :: MapBB -> [OffIns] -> [OffIns] -> MapBB
+buildCFG' hmap [] _ = hmap
+buildCFG' hmap (((off, entry), _):xs) insns = buildCFG' (insertlist entryi hmap) xs insns
where
- cio' :: Offset -> [Instruction] -> [(Offset, Instruction)]
+ insertlist :: [BlockID] -> MapBB -> MapBB
+ insertlist [] hmap = hmap
+ insertlist (x:xs) hmap = insertlist xs newhmap
+ where
+ newhmap = if H.member x hmap then hmap else H.insert x value hmap
+ value = parseBasicBlock x 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 -> []
+
+
+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
+
+ -- 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])
+
+ validins :: ((Int, Maybe BBEnd), Instruction) -> Bool
+ validins ((_,x),_) = case x of Just _ -> False; Nothing -> True
+
+
+calculateInstructionOffset :: [Instruction] -> [OffIns]
+calculateInstructionOffset = cio' (0, Nothing)
+ where
+ newoffset :: Instruction -> Int -> Offset
+ 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
+
+ cio' :: Offset -> [Instruction] -> [OffIns]
cio' _ [] = []
- cio' off (x:xs) = (off,x):(cio' newoffset xs)
- where newoffset = off + (fromIntegral $ B.length $ encodeInstructions [x])
+ -- TODO(bernhard): add more instruction with offset (IF_ACMP, JSR, ...)
+ cio' (off,_) (x:xs) = case x of
+ IF _ w16 -> twotargets w16
+ IF_ICMP _ w16 -> twotargets w16
+ GOTO w16 -> onetarget w16
+ IRETURN -> 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
+ next = cio' (newoffset x off) xs
projects / mate.git / blobdiff