codegen: handle exceptions of a method

[mate.git] / Mate / BasicBlocks.hs

diff --git a/Mate/BasicBlocks.hs b/Mate/BasicBlocks.hs
index 179560087db79b55ece4054dec80f1369921fcd1..2f96a40fe66ee6ce5b86b644141b3e3cf269b964 100644 (file)
--- a/Mate/BasicBlocks.hs
+++ b/Mate/BasicBlocks.hs
@@ -36,13 +36,10 @@ type BBState = S.Set Target
 type AnalyseState = State BBState [OffIns]
 
 
-noException :: B.ByteString
-noException = B.empty
-
 emptyBasicBlock :: BasicBlock
 emptyBasicBlock = BasicBlock
                     { code = []
-                    , exception = noException
+                    , bblength = 0
                     , successor = Return }
 
 printMapBB :: MapBB -> IO ()
@@ -57,7 +54,7 @@ printMapBB hmap = do
       printMapBB' [] _ = return ()
       printMapBB' (i:is) hmap' = case M.lookup i hmap' of
         Just bb -> do
-          printfBb $ "Block " ++ show i ++ "\n"
+          printfBb $ "Block " ++ show i ++ ". len: " ++ (show $ bblength bb) ++ "\n"
           mapM_ (printfBb . flip (++) "\n" . (++) "\t" . show) $ code bb
           printfBb $ case successor bb of
             Return -> ""
@@ -107,44 +104,52 @@ parseMethod cls methodname sig = do
   let nametype = methodNameType methoddirect
   let argscount = methodGetArgsCount nametype + (if isStatic then 0 else 1)
 
-  -- TODO: remove ;-)
-  -- small example how to get information about
-  -- exceptions of a method
-  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 exceptionMap :: ExceptionMap
+      exceptionMap = foldl f M.empty $ codeExceptions decoded
+        where
+          f emap ce =
+            if M.member key emap
+              then M.adjust (value:) key emap
+              else M.insert key [value] emap
+              where
+                key = (&&&) eStartPC eEndPC ce
+                value = (&&&) g eHandlerPC ce
+                  where
+                    g ce' = case eCatchType ce' of
+                        0 -> B.empty
+                        x -> buildClassID cls x
+
   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
+  return $ RawMethod mapbb exceptionMap locals stacks argscount codelen
 
 
 testCFG :: Code -> MapBB
 testCFG c = buildCFG (codeInstructions c) (codeExceptions c)
-
-buildCFG :: [Instruction] -> [CodeException] -> MapBB
-buildCFG xs excps = execState (mapM (buildCFG' offins) $ alltargets ++ handlerEntries) M.empty
   where
-  (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 :: [Instruction] -> [CodeException] -> MapBB
+    buildCFG xs excps = execState (mapM buildCFG' $ alltargets ++ handlerEntries) M.empty
+      where
+      (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
-  let value = parseBasicBlock off insns
-  modify (M.insert off value)
+      buildCFG' :: Int -> State MapBB ()
+      buildCFG' off = do
+        let value = parseBasicBlock off offins
+        modify (M.insert off value)
 
 parseBasicBlock :: Int -> [OffIns] -> BasicBlock
-parseBasicBlock i insns = emptyBasicBlock { code = insonly, successor = endblock }
+parseBasicBlock i insns = emptyBasicBlock
+          { code = zip offsets insonly
+          , bblength = lastoff - i + (insnLength lastins)
+          , successor = endblock }
   where
     (lastblock, is) = takeWhilePlusOne validins omitins insns
-    (_, _, insonly) = unzip3 is
-    (_, Just endblock, _) = fromJust lastblock
+    (offsets, _, insonly) = unzip3 is
+    (lastoff, Just endblock, lastins) = fromJust lastblock
 
     -- also take last (non-matched) element and return it
     takeWhilePlusOne :: (a -> Bool) -> (a -> Bool) -> [a] -> (Maybe a, [a])