2 {-# LANGUAGE OverloadedStrings #-}
3 {-# LANGUAGE ForeignFunctionInterface #-}
5 module Mate.ClassPool (
13 getInterfaceMethodOffset
19 import qualified Data.Map as M
20 import qualified Data.Set as S
21 import qualified Data.ByteString.Lazy as B
32 import Foreign.C.Types
33 import Foreign.Storable
38 import Mate.BasicBlocks
39 import {-# SOURCE #-} Mate.MethodPool
43 import Mate.GarbageAlloc
45 getClassInfo :: B.ByteString -> IO ClassInfo
46 getClassInfo path = do
47 class_map <- getClassMap
48 case M.lookup path class_map of
49 Nothing -> loadAndInitClass path
52 getClassFile :: B.ByteString -> IO (Class Resolved)
53 getClassFile path = do
54 ci <- getClassInfo path
57 getStaticFieldOffset :: B.ByteString -> B.ByteString -> IO CUInt
58 getStaticFieldOffset path field = do
59 ci <- getClassInfo path
60 return $ fromIntegral $ ciStaticMap ci M.! field
62 getFieldOffset :: B.ByteString -> B.ByteString -> IO Int32
63 getFieldOffset path field = do
64 ci <- getClassInfo path
65 return $ ciFieldMap ci M.! field
67 -- method + signature plz!
68 getMethodOffset :: B.ByteString -> B.ByteString -> IO Word32
69 getMethodOffset path method = do
70 ci <- getClassInfo path
71 -- (4+) one slot for "interface-table-ptr"
72 return $ (+4) $ fromIntegral $ ciMethodMap ci M.! method
74 getMethodTable :: B.ByteString -> IO Word32
75 getMethodTable path = do
76 ci <- getClassInfo path
77 return $ ciMethodBase ci
79 getObjectSize :: B.ByteString -> IO Word32
80 getObjectSize path = do
81 ci <- getClassInfo path
82 -- TODO(bernhard): correct sizes for different types...
83 let fsize = fromIntegral $ M.size $ ciFieldMap ci
84 -- one slot for "method-table-ptr"
85 return $ (1 + fsize) * 4
87 getStaticFieldAddr :: CUInt -> IO CUInt
88 getStaticFieldAddr from = do
90 let w32_from = fromIntegral from
91 let sfi = trapmap M.! w32_from
93 (SFI (StaticFieldInfo cls field)) -> getStaticFieldOffset cls field
94 _ -> error "getFieldAddr: no trapInfo. abort"
96 -- interface + method + signature plz!
97 getInterfaceMethodOffset :: B.ByteString -> B.ByteString -> B.ByteString -> IO Word32
98 getInterfaceMethodOffset ifname meth sig = do
100 ifmmap <- getInterfaceMethodMap
101 let k = ifname `B.append` meth `B.append` sig
102 case M.lookup k ifmmap of
103 Just w32 -> return $ w32 + 4
104 Nothing -> error "getInterfaceMethodOffset: no offset set"
107 loadClass :: B.ByteString -> IO ClassInfo
109 let rpath = toString $ path `B.append` ".class"
110 cfile <- parseClassFile rpath
114 -- load all interfaces, which are implemented by this class
115 sequence_ [ loadInterface i | i <- interfaces cfile ]
116 superclass <- if path /= "java/lang/Object"
118 sc <- loadClass $ superClass cfile
122 (staticmap, fieldmap) <- calculateFields cfile superclass
123 (methodmap, mbase) <- calculateMethodMap cfile superclass
124 immap <- getInterfaceMethodMap
126 -- allocate interface offset table for this class
127 -- TODO(bernhard): we have some duplicates in immap (i.e. some
128 -- entries have the same offset), so we could
129 -- save some memory here.
130 iftable <- mallocClassData ((4*) $ M.size immap)
131 let w32_iftable = fromIntegral $ ptrToIntPtr iftable :: Word32
132 -- store interface-table at offset 0 in method-table
133 pokeElemOff (intPtrToPtr $ fromIntegral mbase) 0 w32_iftable
134 printfCp "staticmap: %s @ %s\n" (show staticmap) (toString path)
135 printfCp "fieldmap: %s @ %s\n" (show fieldmap) (toString path)
136 printfCp "methodmap: %s @ %s\n" (show methodmap) (toString path)
137 printfCp "mbase: 0x%08x\n" mbase
138 printfCp "interfacemethod: %s @ %s\n" (show immap) (toString path)
139 printfCp "iftable: 0x%08x\n" w32_iftable
140 virtual_map <- getVirtualMap
141 setVirtualMap $ M.insert mbase path virtual_map
143 class_map <- getClassMap
144 let new_ci = ClassInfo path cfile staticmap fieldmap methodmap mbase False
145 setClassMap $ M.insert path new_ci class_map
149 loadInterface :: B.ByteString -> IO ()
150 loadInterface path = do
151 imap <- getInterfaceMap
152 -- interface already loaded?
153 case M.lookup path imap of
156 printfCp "interface: loading \"%s\"\n" $ toString path
157 let ifpath = toString $ path `B.append` ".class"
158 cfile <- parseClassFile ifpath
159 -- load "superinterfaces" first
160 sequence_ [ loadInterface i | i <- interfaces cfile ]
161 immap <- getInterfaceMethodMap
163 -- load map again, because there could be new entries now
164 -- due to loading superinterfaces
165 imap' <- getInterfaceMap
166 let max_off = fromIntegral $ M.size immap * 4
167 -- create index of methods by this interface
168 let mm = zipbase max_off (classMethods cfile)
170 -- create for each method from *every* superinterface a entry to,
171 -- but just put in the same offset as it is already in the map
172 let (ifnames, methodnames) = unzip $ concat
173 [ zip (repeat ifname) (classMethods $ imap' M.! ifname)
174 | ifname <- interfaces cfile ]
175 let sm = zipWith (\x y -> (entry y, immap M.! getname x y)) ifnames methodnames
177 -- merge all offset tables
178 setInterfaceMethodMap $ M.fromList sm `M.union` M.fromList mm `M.union` immap
179 setInterfaceMap $ M.insert path cfile imap'
181 zipbase base = zipWith (\x y -> (entry y, x + base)) [0,4..]
183 getname p y = p `B.append` methodName y `B.append` encode (methodSignature y)
186 calculateFields :: Class Resolved -> Maybe ClassInfo -> IO (FieldMap, FieldMap)
187 calculateFields cf superclass = do
188 -- TODO(bernhard): correct sizes. int only atm
190 let (sfields, ifields) = span (S.member ACC_STATIC . fieldAccessFlags) (classFields cf)
192 staticbase <- mallocClassData $ fromIntegral (length sfields) * 4
193 let i_sb = fromIntegral $ ptrToIntPtr staticbase
194 let sm = zipbase i_sb sfields
195 let sc_sm = getsupermap superclass ciStaticMap
196 -- new fields "overwrite" old ones, if they have the same name
197 let staticmap = M.fromList sm `M.union` sc_sm
199 let sc_im = getsupermap superclass ciFieldMap
200 -- "+ 4" for the method table pointer
201 let max_off = (4+) $ fromIntegral $ M.size sc_im * 4
202 let im = zipbase max_off ifields
203 -- new fields "overwrite" old ones, if they have the same name
204 let fieldmap = M.fromList im `M.union` sc_im
206 return (staticmap, fieldmap)
208 zipbase base = zipWith (\x y -> (fieldName y, x + base)) [0,4..]
211 getsupermap :: Maybe ClassInfo -> (ClassInfo -> FieldMap) -> FieldMap
212 getsupermap superclass getter = case superclass of Just x -> getter x; Nothing -> M.empty
215 calculateMethodMap :: Class Resolved -> Maybe ClassInfo -> IO (FieldMap, Word32)
216 calculateMethodMap cf superclass = do
218 (\x -> (not . S.member ACC_STATIC . methodAccessFlags) x &&
219 ((/=) "<init>" . methodName) x)
221 let sc_mm = getsupermap superclass ciMethodMap
222 let max_off = fromIntegral $ M.size sc_mm * 4
223 let mm = zipbase max_off methods
224 let methodmap = M.fromList mm `M.union` sc_mm
226 -- (+1): one slot for the interface-table-ptr
227 methodbase <- mallocClassData (((+1) $ fromIntegral $ M.size methodmap) * 4)
228 return (methodmap, fromIntegral $ ptrToIntPtr methodbase)
229 where zipbase base = zipWith (\x y -> (entry y, x + base)) [0,4..]
230 where entry y = methodName y `B.append` encode (methodSignature y)
233 loadAndInitClass :: B.ByteString -> IO ClassInfo
234 loadAndInitClass path = do
235 class_map <- getClassMap
236 ci <- case M.lookup path class_map of
237 Nothing -> loadClass path
240 -- first try to execute class initializer of superclass
241 when (path /= "java/lang/Object") (void $ loadAndInitClass $ superClass $ ciFile ci)
243 -- execute class initializer
244 case lookupMethod "<clinit>" (ciFile ci) of
246 hmap <- parseMethod (ciFile ci) "<clinit>"
249 let mi = MethodInfo "<clinit>" path (methodSignature m)
250 entry <- compileBB hmap' mi
251 addMethodRef entry mi [path]
252 printfCp "executing static initializer from %s now\n" (toString path)
254 printfCp "static initializer from %s done\n" (toString path)
255 Nothing -> error "loadClass: static initializer not found (WTF?). abort"
258 class_map' <- getClassMap
259 let new_ci = ci { ciInitDone = True }
260 setClassMap $ M.insert path new_ci class_map'