1 {-# LANGUAGE TypeFamilies, StandaloneDeriving, FlexibleInstances, FlexibleContexts, UndecidableInstances, RecordWildCards, OverloadedStrings #-}
2 -- | Functions to convert from low-level .class format representation and
3 -- high-level Java classes, methods etc representation
5 (parseClass, parseClassFile,
6 convertClass, classFile,
14 import Control.Monad.Exception
19 import qualified Data.ByteString.Lazy as B
20 import qualified Data.Set as S
21 import qualified Data.Map as M
27 -- | Parse .class file data
28 parseClass :: B.ByteString -> Class Resolved
29 parseClass bstr = convertClass $ decode bstr
31 -- | Parse class data from file
32 parseClassFile :: FilePath -> IO (Class Resolved)
33 parseClassFile path = convertClass `fmap` decodeFile path
35 encodeClass :: (Class Resolved) -> B.ByteString
36 encodeClass cls = encode $ classFile cls
38 convertClass :: Class Pointers -> Class Resolved
39 convertClass (Class {..}) =
40 let pool = constantPoolArray constsPool
41 superName = className $ pool ! superClass
46 constsPoolSize = fromIntegral (M.size pool),
48 accessFlags = convertAccess accessFlags,
49 thisClass = className $ pool ! thisClass,
50 superClass = if superClass == 0 then "" else superName,
51 interfacesCount = interfacesCount,
52 interfaces = map (\i -> className $ pool ! i) interfaces,
53 classFieldsCount = classFieldsCount,
54 classFields = map (convertField pool) classFields,
55 classMethodsCount = classMethodsCount,
56 classMethods = map (convertMethod pool) classMethods,
57 classAttributesCount = classAttributesCount,
58 classAttributes = convertAttrs pool classAttributes }
60 classFile :: Class Resolved -> Class Pointers
61 classFile (Class {..}) = Class {
65 constsPoolSize = fromIntegral (M.size poolInfo + 1),
66 constsPool = poolInfo,
67 accessFlags = access2word16 accessFlags,
68 thisClass = force "this" $ poolClassIndex poolInfo thisClass,
69 superClass = force "super" $ poolClassIndex poolInfo superClass,
70 interfacesCount = fromIntegral (length interfaces),
71 interfaces = map (force "ifaces" . poolIndex poolInfo) interfaces,
72 classFieldsCount = fromIntegral (length classFields),
73 classFields = map (fieldInfo poolInfo) classFields,
74 classMethodsCount = fromIntegral (length classMethods),
75 classMethods = map (methodInfo poolInfo) classMethods,
76 classAttributesCount = fromIntegral (M.size classAttributes),
77 classAttributes = map (attrInfo poolInfo) (M.assocs classAttributes) }
79 poolInfo = toCPInfo constsPool
81 toCPInfo :: Pool Resolved -> Pool Pointers
82 toCPInfo pool = result
84 result = M.map cpInfo pool
86 cpInfo :: Constant Resolved -> Constant Pointers
87 cpInfo (CClass name) = CClass (force "class" $ poolIndex result name)
88 cpInfo (CField cls name) =
89 CField (force "field a" $ poolClassIndex result cls) (force "field b" $ poolNTIndex result name)
90 cpInfo (CMethod cls name) =
91 CMethod (force "method a" $ poolClassIndex result cls) (force ("method b: " ++ show name) $ poolNTIndex result name)
92 cpInfo (CIfaceMethod cls name) =
93 CIfaceMethod (force "iface method a" $ poolIndex result cls) (force "iface method b" $ poolNTIndex result name)
94 cpInfo (CString s) = CString (force "string" $ poolIndex result s)
95 cpInfo (CInteger x) = CInteger x
96 cpInfo (CFloat x) = CFloat x
97 cpInfo (CLong x) = CLong (fromIntegral x)
98 cpInfo (CDouble x) = CDouble x
99 cpInfo (CNameType n t) =
100 CNameType (force "name" $ poolIndex result n) (force "type" $ poolIndex result t)
101 cpInfo (CUTF8 s) = CUTF8 (fromIntegral $ B.length s) s
102 cpInfo (CUnicode s) = CUnicode (fromIntegral $ B.length s) s
104 -- | Find index of given string in the list of constants
105 poolIndex :: (Throws NoItemInPool e) => Pool Pointers -> B.ByteString -> EM e Word16
106 poolIndex list name = case findIndex test list of
107 Nothing -> throw (NoItemInPool name)
108 Just i -> return $ fromIntegral $ i+1
110 test (CUTF8 s) | s == name = True
111 test (CUnicode s) | s == name = True
114 -- | Find index of given string in the list of constants
115 poolClassIndex :: (Throws NoItemInPool e) => Pool Pointers -> B.ByteString -> EM e Word16
116 poolClassIndex list name = case findIndex checkString list of
117 Nothing -> throw (NoItemInPool name)
118 Just i -> case findIndex (checkClass $ fromIntegral $ i+1) list of
119 Nothing -> throw (NoItemInPool $ i+1)
120 Just j -> return $ fromIntegral $ j+1
122 checkString (CUTF8 s) | s == name = True
123 checkString (CUnicode s) | s == name = True
124 checkString _ = False
126 checkClass i (CClass x) | i == x = True
127 checkClass _ _ = False
129 poolNTIndex list x@(NameType n t) = do
130 ni <- poolIndex list n
131 ti <- poolIndex list (byteString t)
132 case findIndex (check ni ti) list of
133 Nothing -> throw (NoItemInPool x)
134 Just i -> return $ fromIntegral (i+1)
136 check ni ti (CNameType n' t')
137 | (ni == n') && (ti == t') = True
140 fieldInfo :: Pool Pointers -> Field Resolved -> Field Pointers
141 fieldInfo pool (Field {..}) = Field {
142 fieldAccessFlags = access2word16 fieldAccessFlags,
143 fieldName = force "field name" $ poolIndex pool fieldName,
144 fieldSignature = force "signature" $ poolIndex pool (encode fieldSignature),
145 fieldAttributesCount = fromIntegral (M.size fieldAttributes),
146 fieldAttributes = map (attrInfo pool) (M.assocs fieldAttributes) }
148 methodInfo :: Pool Pointers -> Method Resolved -> Method Pointers
149 methodInfo pool (Method {..}) = Method {
150 methodAccessFlags = access2word16 methodAccessFlags,
151 methodName = force "method name" $ poolIndex pool methodName,
152 methodSignature = force "method sig" $ poolIndex pool (encode methodSignature),
153 methodAttributesCount = fromIntegral (M.size methodAttributes),
154 methodAttributes = map (attrInfo pool) (M.assocs methodAttributes) }
156 attrInfo :: Pool Pointers -> (B.ByteString, B.ByteString) -> Attributes Pointers
157 attrInfo pool (name, value) = Attribute {
158 attributeName = force "attr name" $ poolIndex pool name,
159 attributeLength = fromIntegral (B.length value),
160 attributeValue = value }
162 constantPoolArray :: Pool Pointers -> Pool Resolved
163 constantPoolArray ps = pool
166 pool = M.map convert ps
168 n = fromIntegral $ length ps
170 convertNameType :: (HasSignature a, Binary (Signature a)) => Word16 -> NameType a
172 let (CNameType n s) = pool ! i
173 in NameType n (decode s)
175 convert (CClass i) = CClass $ getString $ pool ! i
176 convert (CField i j) = CField (className $ pool ! i) (convertNameType j)
177 convert (CMethod i j) = CMethod (className $ pool ! i) (convertNameType j)
178 convert (CIfaceMethod i j) = CIfaceMethod (className $ pool ! i) (convertNameType j)
179 convert (CString i) = CString $ getString $ pool ! i
180 convert (CInteger x) = CInteger x
181 convert (CFloat x) = CFloat x
182 convert (CLong x) = CLong (fromIntegral x)
183 convert (CDouble x) = CDouble x
184 convert (CNameType i j) = CNameType (getString $ pool ! i) (getString $ pool ! j)
185 convert (CUTF8 _ bs) = CUTF8 bs
186 convert (CUnicode _ bs) = CUnicode bs
188 convertAccess :: AccessFlags Pointers -> AccessFlags Resolved
189 convertAccess w = S.fromList $ concat $ zipWith (\i f -> if testBit w i then [f] else []) [0..] $ [
202 access2word16 :: AccessFlags Resolved -> AccessFlags Pointers
203 access2word16 fs = bitsOr $ map toBit $ S.toList fs
205 bitsOr = foldl (.|.) 0
206 toBit f = 1 `shiftL` (fromIntegral $ fromEnum f)
208 convertField :: Pool Resolved -> Field Pointers -> Field Resolved
209 convertField pool (Field {..}) = Field {
210 fieldAccessFlags = convertAccess fieldAccessFlags,
211 fieldName = getString $ pool ! fieldName,
212 fieldSignature = decode $ getString $ pool ! fieldSignature,
213 fieldAttributes = convertAttrs pool fieldAttributes }
215 convertMethod :: Pool Resolved -> Method Pointers -> Method Resolved
216 convertMethod pool (Method {..}) = Method {
217 methodAccessFlags = convertAccess methodAccessFlags,
218 methodName = getString $ pool ! methodName,
219 methodSignature = decode $ getString $ pool ! methodSignature,
220 methodAttributes = convertAttrs pool methodAttributes }
222 convertAttrs :: Pool Resolved -> Attributes Pointers -> Attributes Resolved
223 convertAttrs pool attrs = M.fromList $ map go attrs
225 go (Attribute {..}) = (getString $ pool ! attributeName,
228 -- | Try to get class method by name
229 methodByName :: Class Resolved -> B.ByteString -> Maybe (Method Resolved)
230 methodByName cls name =
231 find (\m -> methodName m == name) (classMethods cls)
233 -- | Try to get object attribute by name
234 attrByName :: (HasAttributes a) => a Resolved -> B.ByteString -> Maybe B.ByteString
235 attrByName x name = M.lookup name (attributes x)
237 -- | Try to get Code for class method (no Code for interface methods)
238 methodCode :: Class Resolved
239 -> B.ByteString -- ^ Method name
240 -> Maybe B.ByteString
241 methodCode cls name = do
242 method <- methodByName cls name
243 attrByName method "Code"