2 {-# LANGUAGE OverloadedStrings #-}
3 {-# LANGUAGE ForeignFunctionInterface #-}
5 module Mate.X86CodeGen where
8 import Data.BinaryState
11 import qualified Data.Map as M
12 import qualified Data.Set as S
13 import qualified Data.ByteString.Lazy as B
16 import Foreign hiding (xor)
17 import Foreign.C.Types
19 import qualified JVM.Assembler as J
20 import JVM.Assembler hiding (Instruction)
24 import Harpy.X86Disassembler
26 import Mate.BasicBlocks
33 foreign import ccall "dynamic"
34 code_int :: FunPtr (CInt -> CInt -> IO CInt) -> CInt -> CInt -> IO CInt
36 foreign import ccall "getMallocObjectAddr"
37 getMallocObjectAddr :: CUInt
39 foreign import ccall "register_signal"
40 register_signal :: IO ()
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 -> Class Resolved -> MapBB -> CodeGen e s (CompileInfo, [Instruction])
53 emitFromBB method 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 return $ Just (calladdr, MI l)
115 emit' :: J.Instruction -> CodeGen e s (Maybe (Word32, TrapInfo))
116 emit' (INVOKESPECIAL cpidx) = emitInvoke cpidx True
117 emit' (INVOKESTATIC cpidx) = emitInvoke cpidx False
118 emit' (INVOKEINTERFACE cpidx _) = do
119 -- get methodInfo entry
120 let mi@(MethodInfo methodname ifacename msig@(MethodSignature args _)) = buildMethodID cls cpidx
121 newNamedLabel (show mi) >>= defineLabel
122 -- objref lives somewhere on the argument stack
123 mov eax (Disp ((*4) $ fromIntegral $ length args), esp)
124 -- get method-table-ptr, keep it in eax (for trap handling)
125 mov eax (Disp 0, eax)
126 -- get interface-table-ptr
127 mov ebx (Disp 0, eax)
129 offset <- liftIO $ getInterfaceMethodOffset ifacename methodname (encode msig)
130 -- make actual (indirect) call
131 calladdr <- getCurrentOffset
132 call (Disp offset, ebx)
133 -- discard arguments on stack (+4 for "this")
134 let argcnt = 4 + 4 * methodGetArgsCount cls cpidx
135 when (argcnt > 0) (add esp argcnt)
136 -- push result on stack if method has a return value
137 when (methodHaveReturnValue cls cpidx) (push eax)
138 -- note, the "mi" has the wrong class reference here.
139 -- we figure that out at run-time, in the methodpool,
140 -- depending on the method-table-ptr
141 return $ Just (calladdr, II mi)
142 emit' (INVOKEVIRTUAL cpidx) = do
143 -- get methodInfo entry
144 let mi@(MethodInfo methodname objname msig@(MethodSignature args _)) = buildMethodID cls cpidx
145 newNamedLabel (show mi) >>= defineLabel
146 -- objref lives somewhere on the argument stack
147 mov eax (Disp ((*4) $ fromIntegral $ length args), esp)
148 -- get method-table-ptr
149 mov eax (Disp 0, eax)
151 let nameAndSig = methodname `B.append` encode msig
152 offset <- liftIO $ getMethodOffset objname nameAndSig
153 -- make actual (indirect) call
154 calladdr <- getCurrentOffset
155 call (Disp offset, eax)
156 -- discard arguments on stack (+4 for "this")
157 let argcnt = 4 + 4 * methodGetArgsCount cls cpidx
158 when (argcnt > 0) (add esp argcnt)
159 -- push result on stack if method has a return value
160 when (methodHaveReturnValue cls cpidx) (push eax)
161 -- note, the "mi" has the wrong class reference here.
162 -- we figure that out at run-time, in the methodpool,
163 -- depending on the method-table-ptr
164 return $ Just (calladdr, VI mi)
165 emit' (PUTSTATIC cpidx) = do
167 trapaddr <- getCurrentOffset
168 mov (Addr 0x00000000) eax -- it's a trap
169 return $ Just (trapaddr, SFI $ buildStaticFieldID cls cpidx)
170 emit' (GETSTATIC cpidx) = do
171 trapaddr <- getCurrentOffset
172 mov eax (Addr 0x00000000) -- it's a trap
174 return $ Just (trapaddr, SFI $ buildStaticFieldID cls cpidx)
175 emit' insn = emit insn >> return Nothing
177 emit :: J.Instruction -> CodeGen e s ()
178 emit POP = add esp (4 :: Word32) -- drop value
179 emit DUP = push (Disp 0, esp)
180 emit AASTORE = emit IASTORE
184 add ebx (1 :: Word32)
186 mov (ecx, ebx, S4) eax
187 emit AALOAD = emit IALOAD
190 add ebx (1 :: Word32)
193 emit ARRAYLENGTH = do
196 emit (ANEWARRAY _) = emit (NEWARRAY 10) -- 10 == T_INT
197 emit (NEWARRAY typ) = do
198 let tsize = case decodeS (0 :: Integer) (B.pack [typ]) of
200 _ -> error "newarray: type not implemented yet"
201 -- get length from stack, but leave it there
202 mov eax (Disp 0, esp)
203 mov ebx (tsize :: Word32)
204 -- multiple amount with native size of one element
205 mul ebx -- result is in eax
206 add eax (4 :: Word32) -- for "length" entry
207 -- push amount of bytes to allocate
210 pop eax -- ref to arraymemory
212 mov (Disp 0, eax) ebx -- store length at offset 0
213 push eax -- push ref again
214 emit (NEW objidx) = do
215 let objname = buildClassID cls objidx
216 amount <- liftIO $ getObjectSize objname
217 push (amount :: Word32)
219 -- TODO(bernhard): save reference somewhere for GC
220 -- set method table pointer
221 mtable <- liftIO $ getMethodTable objname
222 mov (Disp 0, eax) mtable
223 emit (CHECKCAST _) = nop -- TODO(bernhard): ...
224 emit (BIPUSH val) = push (fromIntegral val :: Word32)
225 emit (SIPUSH val) = push (fromIntegral (fromIntegral val :: Int16) :: Word32)
226 emit (ICONST_0) = push (0 :: Word32)
227 emit (ICONST_1) = push (1 :: Word32)
228 emit (ICONST_2) = push (2 :: Word32)
229 emit (ICONST_3) = push (3 :: Word32)
230 emit (ICONST_4) = push (4 :: Word32)
231 emit (ICONST_5) = push (5 :: Word32)
232 emit (ALOAD_ x) = emit (ILOAD_ x)
233 emit (ILOAD_ x) = push (Disp (cArgs_ x), ebp)
234 emit (ALOAD x) = emit (ILOAD x)
235 emit (ILOAD x) = push (Disp (cArgs x), ebp)
236 emit (ASTORE_ x) = emit (ISTORE_ x)
237 emit (ISTORE_ x) = do
239 mov (Disp (cArgs_ x), ebp) eax
240 emit (ASTORE x) = emit (ISTORE x)
243 mov (Disp (cArgs x), ebp) eax
245 emit (LDC1 x) = emit (LDC2 $ fromIntegral x)
247 value <- case constsPool cls M.! x of
248 (CString s) -> liftIO $ getUniqueStringAddr s
249 _ -> error "LDCI... missing impl."
251 emit (GETFIELD x) = do
252 offset <- emitFieldOffset x
253 push (Disp (fromIntegral offset), eax) -- get field
254 emit (PUTFIELD x) = do
255 pop ebx -- value to write
256 offset <- emitFieldOffset x
257 mov (Disp (fromIntegral offset), eax) ebx -- set field
259 emit IADD = do pop ebx; pop eax; add eax ebx; push eax
260 emit ISUB = do pop ebx; pop eax; sub eax ebx; push eax
261 emit IMUL = do pop ebx; pop eax; mul ebx; push eax
262 emit IXOR = do pop ebx; pop eax; xor eax ebx; push eax
264 add (Disp (cArgs x), ebp) (s8_w32 imm)
266 emit (IF_ACMP cond x) = emit (IF_ICMP cond x)
267 emit (IF_ICMP cond _) = do
270 cmp ebx eax -- intel syntax is swapped (TODO(bernhard): test that plz)
273 emit (IF cond _) = do
275 cmp eax (0 :: Word32) -- TODO(bernhard): test that plz
279 let sid = case successor bb of OneTarget t -> t; _ -> error "bad"
280 jmp $ getLabel sid lmap
282 emit RETURN = do mov esp ebp; pop ebp; ret
283 emit ARETURN = emit IRETURN
284 emit IRETURN = do pop eax; emit RETURN
285 emit invalid = error $ "insn not implemented yet: " ++ show invalid
287 emitFieldOffset :: Word16 -> CodeGen e s Int32
288 emitFieldOffset x = do
289 pop eax -- this pointer
290 let (cname, fname) = buildFieldOffset cls x
291 liftIO $ getFieldOffset cname fname
293 emitIF :: CMP -> CodeGen e s ()
295 sid = case successor bb of TwoTarget _ t -> t; _ -> error "bad"
296 l = getLabel sid lmap
298 C_EQ -> je l; C_NE -> jne l
299 C_LT -> jl l; C_GT -> jg l
300 C_GE -> jge l; C_LE -> jle l
302 callMalloc :: CodeGen e s ()
304 calladdr <- getCurrentOffset
305 let w32_calladdr = 5 + calladdr
306 let malloaddr = fromIntegral getMallocObjectAddr :: Word32
307 call (malloaddr - w32_calladdr)
308 add esp (4 :: Word32)
311 -- for locals we use a different storage
312 cArgs :: Word8 -> Word32
313 cArgs x = if x' >= thisMethodArgCnt
314 -- TODO(bernhard): maybe s/(-4)/(-8)/
315 then fromIntegral $ (-4) * (x' - thisMethodArgCnt + 1)
316 else 4 + (thisMethodArgCnt * 4) - (4 * x')
317 where x' = fromIntegral x
319 cArgs_ :: IMM -> Word32
320 cArgs_ x = cArgs $ case x of I0 -> 0; I1 -> 1; I2 -> 2; I3 -> 3
322 thisMethodArgCnt :: Word32
323 thisMethodArgCnt = isNonStatic + fromIntegral (length args)
325 (Just m) = lookupMethod method cls
326 (MethodSignature args _) = methodSignature m
327 isNonStatic = if S.member ACC_STATIC (methodAccessFlags m)
328 then 0 else 1 -- one argument for the this pointer
331 -- sign extension from w8 to w32 (over s8)
332 -- unfortunately, hs-java is using Word8 everywhere (while
333 -- it should be Int8 actually)
334 s8_w32 :: Word8 -> Word32
335 s8_w32 w8 = fromIntegral s8
336 where s8 = fromIntegral w8 :: Int8