1 {-# LANGUAGE OverloadedStrings #-}
2 module Mate.Utilities where
5 import qualified Data.Map as M
6 import qualified Data.ByteString.Lazy as B
13 -- TODO: actually this function already exists in hs-java-0.3!
14 lookupMethod :: B.ByteString -> Class Resolved -> Maybe (Method Resolved)
15 lookupMethod name cls = look (classMethods cls)
19 | methodName f == name = Just f
22 buildMethodID :: Class Resolved -> Word16 -> MethodInfo
23 buildMethodID cls idx = MethodInfo (ntName nt) rc (ntSignature nt)
25 (CMethod rc nt) = (constsPool cls) M.! idx
27 buildStaticFieldID :: Class Resolved -> Word16 -> StaticFieldInfo
28 buildStaticFieldID cls idx = StaticFieldInfo rc (ntName fnt)
29 where (CField rc fnt) = (constsPool cls) M.! idx
31 buildFieldOffset :: Class Resolved -> Word16 -> (B.ByteString, B.ByteString)
32 buildFieldOffset cls idx = (rc, ntName fnt)
33 where (CField rc fnt) = (constsPool cls) M.! idx
35 buildClassID :: Class Resolved -> Word16 -> B.ByteString
36 buildClassID cls idx = cl
37 where (CClass cl) = (constsPool cls) M.! idx
39 methodGetArgsCount :: Class Resolved -> Word16 -> Word32
40 methodGetArgsCount cls idx = fromIntegral $ length args
42 (CMethod _ nt) = (constsPool cls) M.! idx
43 (MethodSignature args _) = ntSignature nt
45 -- TODO(bernhard): Extend it to more than just int, and provide typeinformation
46 methodHaveReturnValue :: Class Resolved -> Word16 -> Bool
47 methodHaveReturnValue cls idx = case ret of
49 (Returns IntType) -> True;
50 _ -> error "methodHaveReturnValue: todo"
52 (CMethod _ nt) = (constsPool cls) M.! idx
53 (MethodSignature _ ret) = ntSignature nt