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 let imm8 = is8BitOffset offset
143 return $ Just (calladdr + (if imm8 then 3 else 6), II imm8 mi)
144 emit' (INVOKEVIRTUAL cpidx) = do
145 -- get methodInfo entry
146 let mi@(MethodInfo methodname objname msig@(MethodSignature args _)) = buildMethodID cls cpidx
147 newNamedLabel (show mi) >>= defineLabel
148 -- objref lives somewhere on the argument stack
149 mov eax (Disp ((*4) $ fromIntegral $ length args), esp)
150 -- get method-table-ptr
151 mov eax (Disp 0, eax)
153 let nameAndSig = methodname `B.append` encode msig
154 offset <- liftIO $ getMethodOffset objname nameAndSig
155 -- make actual (indirect) call
156 calladdr <- getCurrentOffset
157 call (Disp offset, eax)
158 -- discard arguments on stack (+4 for "this")
159 let argcnt = 4 + 4 * methodGetArgsCount cls cpidx
160 when (argcnt > 0) (add esp argcnt)
161 -- push result on stack if method has a return value
162 when (methodHaveReturnValue cls cpidx) (push eax)
163 -- note, the "mi" has the wrong class reference here.
164 -- we figure that out at run-time, in the methodpool,
165 -- depending on the method-table-ptr
166 let imm8 = is8BitOffset offset
167 return $ Just (calladdr + (if imm8 then 3 else 6), VI imm8 mi)
168 emit' (PUTSTATIC cpidx) = do
170 trapaddr <- getCurrentOffset
171 mov (Addr 0x00000000) eax -- it's a trap
172 return $ Just (trapaddr, SFI $ buildStaticFieldID cls cpidx)
173 emit' (GETSTATIC cpidx) = do
174 trapaddr <- getCurrentOffset
175 mov eax (Addr 0x00000000) -- it's a trap
177 return $ Just (trapaddr, SFI $ buildStaticFieldID cls cpidx)
178 emit' insn = emit insn >> return Nothing
180 emit :: J.Instruction -> CodeGen e s ()
181 emit POP = add esp (4 :: Word32) -- drop value
182 emit DUP = push (Disp 0, esp)
183 emit DUP_X1 = do pop eax; pop ebx; push eax; push ebx; push eax
184 emit AASTORE = emit IASTORE
188 add ebx (1 :: Word32)
190 mov (ecx, ebx, S4) eax
194 add ebx (1 :: Word32)
196 mov (ecx, ebx, S1) eax -- TODO(bernhard): char is two byte
197 emit AALOAD = emit IALOAD
200 add ebx (1 :: Word32)
205 add ebx (1 :: Word32)
207 push (ecx, ebx, S1) -- TODO(bernhard): char is two byte
208 emit ARRAYLENGTH = do
211 emit (ANEWARRAY _) = emit (NEWARRAY 10) -- 10 == T_INT
212 emit (NEWARRAY typ) = do
213 let tsize = case decodeS (0 :: Integer) (B.pack [typ]) of
216 _ -> error "newarray: type not implemented yet"
217 -- get length from stack, but leave it there
218 mov eax (Disp 0, esp)
219 mov ebx (tsize :: Word32)
220 -- multiple amount with native size of one element
221 mul ebx -- result is in eax
222 add eax (4 :: Word32) -- for "length" entry
223 -- push amount of bytes to allocate
226 pop eax -- ref to arraymemory
228 mov (Disp 0, eax) ebx -- store length at offset 0
229 push eax -- push ref again
230 emit (NEW objidx) = do
231 let objname = buildClassID cls objidx
232 amount <- liftIO $ getObjectSize objname
233 push (amount :: Word32)
235 -- TODO(bernhard): save reference somewhere for GC
236 -- set method table pointer
237 mtable <- liftIO $ getMethodTable objname
238 mov (Disp 0, eax) mtable
239 emit (CHECKCAST _) = nop -- TODO(bernhard): ...
240 emit ATHROW = nop -- TODO(bernhard): ...
243 and eax (0x000000ff :: Word32)
245 emit (BIPUSH val) = push (fromIntegral val :: Word32)
246 emit (SIPUSH val) = push (fromIntegral (fromIntegral val :: Int16) :: Word32)
247 emit ACONST_NULL = push (0 :: Word32)
248 emit (ICONST_M1) = push ((-1) :: Word32)
249 emit (ICONST_0) = push (0 :: Word32)
250 emit (ICONST_1) = push (1 :: Word32)
251 emit (ICONST_2) = push (2 :: Word32)
252 emit (ICONST_3) = push (3 :: Word32)
253 emit (ICONST_4) = push (4 :: Word32)
254 emit (ICONST_5) = push (5 :: Word32)
255 emit (ALOAD_ x) = emit (ILOAD_ x)
256 emit (ILOAD_ x) = push (Disp (cArgs_ x), ebp)
257 emit (ALOAD x) = emit (ILOAD x)
258 emit (ILOAD x) = push (Disp (cArgs x), ebp)
259 emit (ASTORE_ x) = emit (ISTORE_ x)
260 emit (ISTORE_ x) = do
262 mov (Disp (cArgs_ x), ebp) eax
263 emit (ASTORE x) = emit (ISTORE x)
266 mov (Disp (cArgs x), ebp) eax
268 emit (LDC1 x) = emit (LDC2 $ fromIntegral x)
270 value <- case constsPool cls M.! x of
271 (CString s) -> liftIO $ getUniqueStringAddr s
272 e -> error $ "LDCI... missing impl.: " ++ show e
274 emit (GETFIELD x) = do
275 offset <- emitFieldOffset x
276 push (Disp (fromIntegral offset), eax) -- get field
277 emit (PUTFIELD x) = do
278 pop ebx -- value to write
279 offset <- emitFieldOffset x
280 mov (Disp (fromIntegral offset), eax) ebx -- set field
282 emit IADD = do pop ebx; pop eax; add eax ebx; push eax
283 emit ISUB = do pop ebx; pop eax; sub eax ebx; push eax
284 emit IMUL = do pop ebx; pop eax; mul ebx; push eax
285 emit IDIV = do pop ebx; pop eax; xor edx edx; div ebx; push eax
286 emit IREM = do pop ebx; pop eax; xor edx edx; div ebx; push edx
287 emit IXOR = do pop ebx; pop eax; xor eax ebx; push eax
288 emit INEG = do pop eax; neg eax; push eax
290 add (Disp (cArgs x), ebp) (s8_w32 imm)
292 emit (IFNONNULL x) = emit (IF C_NE x)
293 emit (IFNULL x) = emit (IF C_EQ x)
294 emit (IF_ACMP cond x) = emit (IF_ICMP cond x)
295 emit (IF_ICMP cond _) = do
298 cmp ebx eax -- intel syntax is swapped (TODO(bernhard): test that plz)
301 emit (IF cond _) = do
303 cmp eax (0 :: Word32) -- TODO(bernhard): test that plz
307 let sid = case successor bb of OneTarget t -> t; _ -> error "bad"
308 jmp $ getLabel sid lmap
310 emit RETURN = do mov esp ebp; pop ebp; ret
311 emit ARETURN = emit IRETURN
312 emit IRETURN = do pop eax; emit RETURN
313 emit invalid = error $ "insn not implemented yet: " ++ show invalid
315 emitFieldOffset :: Word16 -> CodeGen e s Int32
316 emitFieldOffset x = do
317 pop eax -- this pointer
318 let (cname, fname) = buildFieldOffset cls x
319 liftIO $ getFieldOffset cname fname
321 emitIF :: CMP -> CodeGen e s ()
323 sid = case successor bb of TwoTarget _ t -> t; _ -> error "bad"
324 l = getLabel sid lmap
326 C_EQ -> je l; C_NE -> jne l
327 C_LT -> jl l; C_GT -> jg l
328 C_GE -> jge l; C_LE -> jle l
330 callMalloc :: CodeGen e s ()
332 calladdr <- getCurrentOffset
333 let w32_calladdr = 5 + calladdr
334 let malloaddr = fromIntegral getMallocObjectAddr :: Word32
335 call (malloaddr - w32_calladdr)
336 add esp (4 :: Word32)
339 -- for locals we use a different storage
340 cArgs :: Word8 -> Word32
341 cArgs x = if x' >= thisMethodArgCnt
342 -- TODO(bernhard): maybe s/(-4)/(-8)/
343 then fromIntegral $ (-4) * (x' - thisMethodArgCnt + 1)
344 else 4 + (thisMethodArgCnt * 4) - (4 * x')
345 where x' = fromIntegral x
347 cArgs_ :: IMM -> Word32
348 cArgs_ x = cArgs $ case x of I0 -> 0; I1 -> 1; I2 -> 2; I3 -> 3
350 thisMethodArgCnt :: Word32
351 thisMethodArgCnt = isNonStatic + fromIntegral (length args)
353 (Just m) = lookupMethodSig method sig cls
354 (MethodSignature args _) = sig
355 isNonStatic = if S.member ACC_STATIC (methodAccessFlags m)
356 then 0 else 1 -- one argument for the this pointer
359 -- sign extension from w8 to w32 (over s8)
360 -- unfortunately, hs-java is using Word8 everywhere (while
361 -- it should be Int8 actually)
362 s8_w32 :: Word8 -> Word32
363 s8_w32 w8 = fromIntegral s8
364 where s8 = fromIntegral w8 :: Int8
366 is8BitOffset :: Word32 -> Bool
367 is8BitOffset w32 = s32 < 128 && s32 > (-127)
368 where s32 = fromIntegral w32 :: Int32