asm: `if<cond>' has also an word16 immediate

[hs-java.git] / JVM / Assembler.hs

diff --git a/JVM/Assembler.hs b/JVM/Assembler.hs
index a3162c0296b02dd2a685364ffecbb454b7faf2a9..6a10b3c0b626637a88f05ca9671ced7cd97de9ef 100644 (file)
--- a/JVM/Assembler.hs
+++ b/JVM/Assembler.hs
@@ -9,16 +9,20 @@ module JVM.Assembler
    CodeException (..),
    Code (..),
    IMM (..),
-   CMP (..)
+   CMP (..),
+   atype2byte,
+   encodeInstructions,
+   encodeMethod,
+   decodeMethod
   )
   where
 
 import Control.Monad
 import Control.Applicative
+import Data.Ix (inRange)
 import Data.Word
 import qualified Data.Binary as Binary
 import qualified Data.ByteString.Lazy as B
-import Data.Array
 
 import Data.BinaryState
 import JVM.ClassFile
@@ -50,7 +54,7 @@ data Code = Code {
     codeExceptionsN :: Word16,
     codeExceptions :: [CodeException],
     codeAttrsN :: Word16,
-    codeAttributes :: [AttributeInfo] }
+    codeAttributes :: Attributes File }
   deriving (Eq, Show)
 
 -- | Exception descriptor
@@ -70,7 +74,7 @@ instance BinaryState Integer CodeException where
 
   get = CodeException <$> get <*> get <*> get <*> get
 
-instance BinaryState Integer AttributeInfo where
+instance BinaryState Integer Attribute where
   put a = do
     let sz = 6 + attributeLength a      -- full size of AttributeInfo structure
     liftOffset (fromIntegral sz) Binary.put a
@@ -86,7 +90,7 @@ instance BinaryState Integer Code where
     put codeExceptionsN
     forM_ codeExceptions put
     put codeAttrsN
-    forM_ codeAttributes put
+    forM_ (attributesList codeAttributes) put
 
   get = do
     stackSz <- get
@@ -99,7 +103,7 @@ instance BinaryState Integer Code where
     excs <- replicateM (fromIntegral excn) get
     nAttrs <- get
     attrs <- replicateM (fromIntegral nAttrs) get
-    return $ Code stackSz locals len code excn excs nAttrs attrs
+    return $ Code stackSz locals len code excn excs nAttrs (AP attrs)
 
 -- | Read sequence of instructions (to end of stream)
 readInstructions :: GetState Integer [Instruction]
@@ -112,7 +116,7 @@ readInstructions = do
           next <- readInstructions
           return (x: next)
 
--- | JVM instruction set
+-- | JVM instruction set. For comments, see JVM specification.
 data Instruction =
     NOP            -- ^ 0
   | ACONST_NULL    -- ^ 1
@@ -235,10 +239,10 @@ data Instruction =
   | LCMP                   -- ^ 148
   | FCMP CMP               -- ^ 149, 150
   | DCMP CMP               -- ^ 151, 152
-  | IF CMP                 -- ^ 153, 154, 155, 156, 157, 158
+  | IF CMP Word16          -- ^ 153, 154, 155, 156, 157, 158
   | IF_ICMP CMP Word16     -- ^ 159, 160, 161, 162, 163, 164
   | IF_ACMP CMP Word16     -- ^ 165, 166
-  | GOTO                   -- ^ 167
+  | GOTO Word16            -- ^ 167
   | JSR Word16             -- ^ 168
   | RET                    -- ^ 169
   | TABLESWITCH Word32 Word32 Word32 [Word32]     -- ^ 170
@@ -471,12 +475,12 @@ instance BinaryState Integer Instruction where
   put (DCMP C_LT)     = putByte 151
   put (DCMP C_GT)     = putByte 152
   put (DCMP c)        = fail $ "No such instruction: DCMP " ++ show c
-  put (IF c)          = putByte (fromIntegral $ 153 + fromEnum c)
+  put (IF c x)        = putByte (fromIntegral $ 153 + fromEnum c) >> put x
   put (IF_ACMP C_EQ x) = put1 165 x
   put (IF_ACMP C_NE x) = put1 166 x
   put (IF_ACMP c _)   = fail $ "No such instruction: IF_ACMP " ++ show c
   put (IF_ICMP c x)   = putByte (fromIntegral $ 159 + fromEnum c) >> put x
-  put  GOTO           = putByte 167
+  put (GOTO x)        = put1 167 x
   put (JSR x)         = put1 168 x
   put  RET            = putByte 169
   put (TABLESWITCH def low high offs) = do
@@ -642,7 +646,7 @@ instance BinaryState Integer Instruction where
       152 -> return $ DCMP C_GT
       165 -> IF_ACMP C_EQ <$> get
       166 -> IF_ACMP C_NE <$> get
-      167 -> return GOTO
+      167 -> GOTO <$> get
       168 -> JSR <$> get
       169 -> return RET
       170 -> do
@@ -700,7 +704,21 @@ instance BinaryState Integer Instruction where
         | inRange (34, 37) c -> imm 34 FLOAD_ c
         | inRange (38, 41) c -> imm 38 DLOAD_ c
         | inRange (42, 45) c -> imm 42 ALOAD_ c
-        | inRange (153, 158) c -> return $ IF (toEnum $ fromIntegral $ c-153)
+        | inRange (153, 158) c -> IF (toEnum $ fromIntegral $ c-153) <$> get
         | inRange (159, 164) c -> IF_ICMP (toEnum $ fromIntegral $ c-159) <$> get
         | otherwise -> fail $ "Unknown instruction byte code: " ++ show c
+
+-- | Encode list of instructions
+encodeInstructions :: [Instruction] -> B.ByteString
+encodeInstructions code =
+  let p list = forM_ list put
+  in  encodeWith p (0 :: Integer) code
   
+-- | Decode Java method
+decodeMethod :: B.ByteString -> Code
+decodeMethod str = decodeS (0 :: Integer) str
+
+-- | Encode Java method
+encodeMethod :: Code -> B.ByteString
+encodeMethod code = encodeS (0 :: Integer) code
+