2 {-# LANGUAGE OverloadedStrings #-}
3 {-# LANGUAGE ForeignFunctionInterface #-}
5 module Mate.X86CodeGen where
7 import Prelude hiding (and, div)
9 import Data.BinaryState
12 import qualified Data.Map as M
13 import qualified Data.Set as S
14 import qualified Data.ByteString.Lazy as B
17 import Foreign hiding (xor)
18 import Foreign.C.Types
20 import qualified JVM.Assembler as J
21 import JVM.Assembler hiding (Instruction)
25 import Harpy.X86Disassembler
27 import Mate.BasicBlocks
37 foreign import ccall "dynamic"
38 code_int :: FunPtr (CInt -> CInt -> IO CInt) -> CInt -> CInt -> IO CInt
40 foreign import ccall "getMallocObjectAddr"
41 getMallocObjectAddr :: CUInt
43 type EntryPoint = Ptr Word8
44 type EntryPointOffset = Int
45 type PatchInfo = (BlockID, EntryPointOffset)
47 type BBStarts = M.Map BlockID Int
49 type CompileInfo = (EntryPoint, BBStarts, Int, TrapMap)
52 emitFromBB :: B.ByteString -> MethodSignature -> Class Direct -> MapBB -> CodeGen e s (CompileInfo, [Instruction])
53 emitFromBB method sig cls hmap = do
54 llmap <- sequence [newNamedLabel ("bb_" ++ show x) | (x,_) <- M.toList hmap]
55 let lmap = zip (Prelude.fst $ unzip $ M.toList hmap) llmap
59 -- TODO(bernhard): determine a reasonable value.
60 -- e.g. (locals used) * 4
61 sub esp (0x60 :: Word32)
63 (calls, bbstarts) <- efBB (0, hmap M.! 0) M.empty M.empty lmap
66 return ((ep, bbstarts, end, calls), d)
68 getLabel :: BlockID -> [(BlockID, Label)] -> Label
69 getLabel _ [] = error "label not found!"
70 getLabel i ((x,l):xs) = if i==x then l else getLabel i xs
72 efBB :: (BlockID, BasicBlock) -> TrapMap -> BBStarts -> [(BlockID, Label)] -> CodeGen e s (TrapMap, BBStarts)
73 efBB (bid, bb) calls bbstarts lmap =
74 if M.member bid bbstarts then
75 return (calls, bbstarts)
77 bb_offset <- getCodeOffset
78 let bbstarts' = M.insert bid bb_offset bbstarts
79 defineLabel $ getLabel bid lmap
80 cs <- mapM emit' $ code bb
81 let calls' = calls `M.union` M.fromList (catMaybes cs)
83 Return -> return (calls', bbstarts')
84 FallThrough t -> efBB (t, hmap M.! t) calls' bbstarts' lmap
85 OneTarget t -> efBB (t, hmap M.! t) calls' bbstarts' lmap
87 (calls'', bbstarts'') <- efBB (t1, hmap M.! t1) calls' bbstarts' lmap
88 efBB (t2, hmap M.! t2) calls'' bbstarts'' lmap
89 -- TODO(bernhard): also use metainformation
90 -- TODO(bernhard): implement `emit' as function which accepts a list of
91 -- instructions, so we can use patterns for optimizations
93 getCurrentOffset :: CodeGen e s Word32
96 let w32_ep = (fromIntegral $ ptrToIntPtr ep) :: Word32
97 offset <- getCodeOffset
98 return $ w32_ep + fromIntegral offset
100 emitInvoke :: Word16 -> Bool -> CodeGen e s (Maybe (Word32, TrapInfo))
101 emitInvoke cpidx hasThis = do
102 let l = buildMethodID cls cpidx
103 calladdr <- getCurrentOffset
104 newNamedLabel (show l) >>= defineLabel
105 -- causes SIGILL. in the signal handler we patch it to the acutal call.
106 -- place a nop at the end, therefore the disasm doesn't screw up
107 emit32 (0xffff9090 :: Word32) >> emit8 (0x90 :: Word8)
108 -- discard arguments on stack
109 let argcnt = ((if hasThis then 1 else 0) + methodGetArgsCount cls cpidx) * 4
110 when (argcnt > 0) (add esp argcnt)
111 -- push result on stack if method has a return value
112 when (methodHaveReturnValue cls cpidx) (push eax)
113 -- +2 is for correcting eip in trap context
114 return $ Just (calladdr + 2, MI l)
116 emit' :: J.Instruction -> CodeGen e s (Maybe (Word32, TrapInfo))
117 emit' (INVOKESPECIAL cpidx) = emitInvoke cpidx True
118 emit' (INVOKESTATIC cpidx) = emitInvoke cpidx False
119 emit' (INVOKEINTERFACE cpidx _) = do
120 -- get methodInfo entry
121 let mi@(MethodInfo methodname ifacename msig@(MethodSignature args _)) = buildMethodID cls cpidx
122 newNamedLabel (show mi) >>= defineLabel
123 -- objref lives somewhere on the argument stack
124 mov eax (Disp ((*4) $ fromIntegral $ length args), esp)
125 -- get method-table-ptr, keep it in eax (for trap handling)
126 mov eax (Disp 0, eax)
127 -- get interface-table-ptr
128 mov ebx (Disp 0, eax)
130 offset <- liftIO $ getInterfaceMethodOffset ifacename methodname (encode msig)
131 -- make actual (indirect) call
132 calladdr <- getCurrentOffset
133 call (Disp offset, ebx)
134 -- discard arguments on stack (+4 for "this")
135 let argcnt = 4 + 4 * methodGetArgsCount cls cpidx
136 when (argcnt > 0) (add esp argcnt)
137 -- push result on stack if method has a return value
138 when (methodHaveReturnValue cls cpidx) (push eax)
139 -- note, the "mi" has the wrong class reference here.
140 -- we figure that out at run-time, in the methodpool,
141 -- depending on the method-table-ptr
142 return $ Just (calladdr, II mi)
143 emit' (INVOKEVIRTUAL cpidx) = do
144 -- get methodInfo entry
145 let mi@(MethodInfo methodname objname msig@(MethodSignature args _)) = buildMethodID cls cpidx
146 newNamedLabel (show mi) >>= defineLabel
147 -- objref lives somewhere on the argument stack
148 mov eax (Disp ((*4) $ fromIntegral $ length args), esp)
149 -- get method-table-ptr
150 mov eax (Disp 0, eax)
152 let nameAndSig = methodname `B.append` encode msig
153 offset <- liftIO $ getMethodOffset objname nameAndSig
154 -- make actual (indirect) call
155 calladdr <- getCurrentOffset
156 call (Disp offset, eax)
157 -- discard arguments on stack (+4 for "this")
158 let argcnt = 4 + 4 * methodGetArgsCount cls cpidx
159 when (argcnt > 0) (add esp argcnt)
160 -- push result on stack if method has a return value
161 when (methodHaveReturnValue cls cpidx) (push eax)
162 -- note, the "mi" has the wrong class reference here.
163 -- we figure that out at run-time, in the methodpool,
164 -- depending on the method-table-ptr
165 return $ Just (calladdr, VI mi)
166 emit' (PUTSTATIC cpidx) = do
168 trapaddr <- getCurrentOffset
169 mov (Addr 0x00000000) eax -- it's a trap
170 return $ Just (trapaddr, SFI $ buildStaticFieldID cls cpidx)
171 emit' (GETSTATIC cpidx) = do
172 trapaddr <- getCurrentOffset
173 mov eax (Addr 0x00000000) -- it's a trap
175 return $ Just (trapaddr, SFI $ buildStaticFieldID cls cpidx)
176 emit' insn = emit insn >> return Nothing
178 emit :: J.Instruction -> CodeGen e s ()
179 emit POP = add esp (4 :: Word32) -- drop value
180 emit DUP = push (Disp 0, esp)
181 emit DUP_X1 = do pop eax; pop ebx; push eax; push ebx; push eax
182 emit AASTORE = emit IASTORE
186 add ebx (1 :: Word32)
188 mov (ecx, ebx, S4) eax
192 add ebx (1 :: Word32)
194 mov (ecx, ebx, S1) eax -- TODO(bernhard): char is two byte
195 emit AALOAD = emit IALOAD
198 add ebx (1 :: Word32)
203 add ebx (1 :: Word32)
205 push (ecx, ebx, S1) -- TODO(bernhard): char is two byte
206 emit ARRAYLENGTH = do
209 emit (ANEWARRAY _) = emit (NEWARRAY 10) -- 10 == T_INT
210 emit (NEWARRAY typ) = do
211 let tsize = case decodeS (0 :: Integer) (B.pack [typ]) of
214 _ -> error "newarray: type not implemented yet"
215 -- get length from stack, but leave it there
216 mov eax (Disp 0, esp)
217 mov ebx (tsize :: Word32)
218 -- multiple amount with native size of one element
219 mul ebx -- result is in eax
220 add eax (4 :: Word32) -- for "length" entry
221 -- push amount of bytes to allocate
224 pop eax -- ref to arraymemory
226 mov (Disp 0, eax) ebx -- store length at offset 0
227 push eax -- push ref again
228 emit (NEW objidx) = do
229 let objname = buildClassID cls objidx
230 amount <- liftIO $ getObjectSize objname
231 push (amount :: Word32)
233 -- TODO(bernhard): save reference somewhere for GC
234 -- set method table pointer
235 mtable <- liftIO $ getMethodTable objname
236 mov (Disp 0, eax) mtable
237 emit (CHECKCAST _) = nop -- TODO(bernhard): ...
238 emit ATHROW = nop -- TODO(bernhard): ...
241 and eax (0x000000ff :: Word32)
243 emit (BIPUSH val) = push (fromIntegral val :: Word32)
244 emit (SIPUSH val) = push (fromIntegral (fromIntegral val :: Int16) :: Word32)
245 emit ACONST_NULL = push (0 :: Word32)
246 emit (ICONST_M1) = push ((-1) :: Word32)
247 emit (ICONST_0) = push (0 :: Word32)
248 emit (ICONST_1) = push (1 :: Word32)
249 emit (ICONST_2) = push (2 :: Word32)
250 emit (ICONST_3) = push (3 :: Word32)
251 emit (ICONST_4) = push (4 :: Word32)
252 emit (ICONST_5) = push (5 :: Word32)
253 emit (ALOAD_ x) = emit (ILOAD_ x)
254 emit (ILOAD_ x) = push (Disp (cArgs_ x), ebp)
255 emit (ALOAD x) = emit (ILOAD x)
256 emit (ILOAD x) = push (Disp (cArgs x), ebp)
257 emit (ASTORE_ x) = emit (ISTORE_ x)
258 emit (ISTORE_ x) = do
260 mov (Disp (cArgs_ x), ebp) eax
261 emit (ASTORE x) = emit (ISTORE x)
264 mov (Disp (cArgs x), ebp) eax
266 emit (LDC1 x) = emit (LDC2 $ fromIntegral x)
268 value <- case constsPool cls M.! x of
269 (CString s) -> liftIO $ getUniqueStringAddr s
270 e -> error $ "LDCI... missing impl.: " ++ show e
272 emit (GETFIELD x) = do
273 offset <- emitFieldOffset x
274 push (Disp (fromIntegral offset), eax) -- get field
275 emit (PUTFIELD x) = do
276 pop ebx -- value to write
277 offset <- emitFieldOffset x
278 mov (Disp (fromIntegral offset), eax) ebx -- set field
280 emit IADD = do pop ebx; pop eax; add eax ebx; push eax
281 emit ISUB = do pop ebx; pop eax; sub eax ebx; push eax
282 emit IMUL = do pop ebx; pop eax; mul ebx; push eax
283 emit IDIV = do pop ebx; pop eax; xor edx edx; div ebx; push eax
284 emit IREM = do pop ebx; pop eax; xor edx edx; div ebx; push edx
285 emit IXOR = do pop ebx; pop eax; xor eax ebx; push eax
286 emit INEG = do pop eax; neg eax; push eax
288 add (Disp (cArgs x), ebp) (s8_w32 imm)
290 emit (IFNONNULL x) = emit (IF C_NE x)
291 emit (IFNULL x) = emit (IF C_EQ x)
292 emit (IF_ACMP cond x) = emit (IF_ICMP cond x)
293 emit (IF_ICMP cond _) = do
296 cmp ebx eax -- intel syntax is swapped (TODO(bernhard): test that plz)
299 emit (IF cond _) = do
301 cmp eax (0 :: Word32) -- TODO(bernhard): test that plz
305 let sid = case successor bb of OneTarget t -> t; _ -> error "bad"
306 jmp $ getLabel sid lmap
308 emit RETURN = do mov esp ebp; pop ebp; ret
309 emit ARETURN = emit IRETURN
310 emit IRETURN = do pop eax; emit RETURN
311 emit invalid = error $ "insn not implemented yet: " ++ show invalid
313 emitFieldOffset :: Word16 -> CodeGen e s Int32
314 emitFieldOffset x = do
315 pop eax -- this pointer
316 let (cname, fname) = buildFieldOffset cls x
317 liftIO $ getFieldOffset cname fname
319 emitIF :: CMP -> CodeGen e s ()
321 sid = case successor bb of TwoTarget _ t -> t; _ -> error "bad"
322 l = getLabel sid lmap
324 C_EQ -> je l; C_NE -> jne l
325 C_LT -> jl l; C_GT -> jg l
326 C_GE -> jge l; C_LE -> jle l
328 callMalloc :: CodeGen e s ()
330 calladdr <- getCurrentOffset
331 let w32_calladdr = 5 + calladdr
332 let malloaddr = fromIntegral getMallocObjectAddr :: Word32
333 call (malloaddr - w32_calladdr)
334 add esp (4 :: Word32)
337 -- for locals we use a different storage
338 cArgs :: Word8 -> Word32
339 cArgs x = if x' >= thisMethodArgCnt
340 -- TODO(bernhard): maybe s/(-4)/(-8)/
341 then fromIntegral $ (-4) * (x' - thisMethodArgCnt + 1)
342 else 4 + (thisMethodArgCnt * 4) - (4 * x')
343 where x' = fromIntegral x
345 cArgs_ :: IMM -> Word32
346 cArgs_ x = cArgs $ case x of I0 -> 0; I1 -> 1; I2 -> 2; I3 -> 3
348 thisMethodArgCnt :: Word32
349 thisMethodArgCnt = isNonStatic + fromIntegral (length args)
351 (Just m) = lookupMethodSig method sig cls
352 (MethodSignature args _) = sig
353 isNonStatic = if S.member ACC_STATIC (methodAccessFlags m)
354 then 0 else 1 -- one argument for the this pointer
357 -- sign extension from w8 to w32 (over s8)
358 -- unfortunately, hs-java is using Word8 everywhere (while
359 -- it should be Int8 actually)
360 s8_w32 :: Word8 -> Word32
361 s8_w32 w8 = fromIntegral s8
362 where s8 = fromIntegral w8 :: Int8