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
38 foreign import ccall "dynamic"
39 code_int :: FunPtr (CInt -> CInt -> IO CInt) -> CInt -> CInt -> IO CInt
41 foreign import ccall "getMallocObjectAddr"
42 getMallocObjectAddr :: CUInt
44 type EntryPoint = Ptr Word8
45 type EntryPointOffset = Int
46 type PatchInfo = (BlockID, EntryPointOffset)
48 type BBStarts = M.Map BlockID Int
50 type CompileInfo = (EntryPoint, BBStarts, Int, TrapMap)
53 emitFromBB :: B.ByteString -> MethodSignature -> Class Direct -> MapBB -> CodeGen e s (CompileInfo, [Instruction])
54 emitFromBB method sig cls hmap = do
55 llmap <- sequence [newNamedLabel ("bb_" ++ show x) | (x,_) <- M.toList hmap]
56 let lmap = zip (Prelude.fst $ unzip $ M.toList hmap) llmap
60 -- TODO(bernhard): determine a reasonable value.
61 -- e.g. (locals used) * 4
62 sub esp (0x60 :: Word32)
64 (calls, bbstarts) <- efBB (0, hmap M.! 0) M.empty M.empty lmap
67 return ((ep, bbstarts, end, calls), d)
69 getLabel :: BlockID -> [(BlockID, Label)] -> Label
70 getLabel _ [] = error "label not found!"
71 getLabel i ((x,l):xs) = if i==x then l else getLabel i xs
73 efBB :: (BlockID, BasicBlock) -> TrapMap -> BBStarts -> [(BlockID, Label)] -> CodeGen e s (TrapMap, BBStarts)
74 efBB (bid, bb) calls bbstarts lmap =
75 if M.member bid bbstarts then
76 return (calls, bbstarts)
78 bb_offset <- getCodeOffset
79 let bbstarts' = M.insert bid bb_offset bbstarts
80 defineLabel $ getLabel bid lmap
81 cs <- mapM emit' $ code bb
82 let calls' = calls `M.union` M.fromList (catMaybes cs)
84 Return -> return (calls', bbstarts')
85 FallThrough t -> efBB (t, hmap M.! t) calls' bbstarts' lmap
86 OneTarget t -> efBB (t, hmap M.! t) calls' bbstarts' lmap
88 (calls'', bbstarts'') <- efBB (t1, hmap M.! t1) calls' bbstarts' lmap
89 efBB (t2, hmap M.! t2) calls'' bbstarts'' lmap
90 -- TODO(bernhard): also use metainformation
91 -- TODO(bernhard): implement `emit' as function which accepts a list of
92 -- instructions, so we can use patterns for optimizations
94 getCurrentOffset :: CodeGen e s Word32
97 let w32_ep = (fromIntegral $ ptrToIntPtr ep) :: Word32
98 offset <- getCodeOffset
99 return $ w32_ep + fromIntegral offset
101 emitInvoke :: Word16 -> Bool -> CodeGen e s (Maybe (Word32, TrapInfo))
102 emitInvoke cpidx hasThis = do
103 let l = buildMethodID cls cpidx
104 calladdr <- getCurrentOffset
105 newNamedLabel (show l) >>= defineLabel
106 -- causes SIGILL. in the signal handler we patch it to the acutal call.
107 -- place a nop at the end, therefore the disasm doesn't screw up
108 emit32 (0xffff9090 :: Word32) >> emit8 (0x90 :: Word8)
109 -- discard arguments on stack
110 let argcnt = ((if hasThis then 1 else 0) + methodGetArgsCount cls cpidx) * 4
111 when (argcnt > 0) (add esp argcnt)
112 -- push result on stack if method has a return value
113 when (methodHaveReturnValue cls cpidx) (push eax)
114 -- +2 is for correcting eip in trap context
115 return $ Just (calladdr + 2, MI l)
117 emit' :: J.Instruction -> CodeGen e s (Maybe (Word32, TrapInfo))
118 emit' (INVOKESPECIAL cpidx) = emitInvoke cpidx True
119 emit' (INVOKESTATIC cpidx) = emitInvoke cpidx False
120 emit' (INVOKEINTERFACE cpidx _) = do
121 -- get methodInfo entry
122 let mi@(MethodInfo methodname ifacename msig@(MethodSignature args _)) = buildMethodID cls cpidx
123 newNamedLabel (show mi) >>= defineLabel
124 -- objref lives somewhere on the argument stack
125 mov eax (Disp ((*4) $ fromIntegral $ length args), esp)
126 -- get method-table-ptr, keep it in eax (for trap handling)
127 mov eax (Disp 0, eax)
128 -- get interface-table-ptr
129 mov ebx (Disp 0, eax)
131 offset <- liftIO $ getInterfaceMethodOffset ifacename methodname (encode msig)
132 -- make actual (indirect) call
133 calladdr <- getCurrentOffset
134 call (Disp offset, ebx)
135 -- discard arguments on stack (+4 for "this")
136 let argcnt = 4 + 4 * methodGetArgsCount cls cpidx
137 when (argcnt > 0) (add esp argcnt)
138 -- push result on stack if method has a return value
139 when (methodHaveReturnValue cls cpidx) (push eax)
140 -- note, the "mi" has the wrong class reference here.
141 -- we figure that out at run-time, in the methodpool,
142 -- depending on the method-table-ptr
143 return $ Just (calladdr, II 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 return $ Just (calladdr, VI mi)
167 emit' (PUTSTATIC cpidx) = do
169 trapaddr <- getCurrentOffset
170 mov (Addr 0x00000000) eax -- it's a trap
171 return $ Just (trapaddr, SFI $ buildStaticFieldID cls cpidx)
172 emit' (GETSTATIC cpidx) = do
173 trapaddr <- getCurrentOffset
174 mov eax (Addr 0x00000000) -- it's a trap
176 return $ Just (trapaddr, SFI $ buildStaticFieldID cls cpidx)
177 emit' insn = emit insn >> return Nothing
179 emit :: J.Instruction -> CodeGen e s ()
180 emit POP = add esp (4 :: Word32) -- drop value
181 emit DUP = push (Disp 0, esp)
182 emit DUP_X1 = do pop eax; pop ebx; push eax; push ebx; push eax
183 emit AASTORE = emit IASTORE
187 add ebx (1 :: Word32)
189 mov (ecx, ebx, S4) eax
193 add ebx (1 :: Word32)
195 mov (ecx, ebx, S1) eax -- TODO(bernhard): char is two byte
196 emit AALOAD = emit IALOAD
199 add ebx (1 :: Word32)
204 add ebx (1 :: Word32)
206 push (ecx, ebx, S1) -- TODO(bernhard): char is two byte
207 emit ARRAYLENGTH = do
210 emit (ANEWARRAY _) = emit (NEWARRAY 10) -- 10 == T_INT
211 emit (NEWARRAY typ) = do
212 let tsize = case decodeS (0 :: Integer) (B.pack [typ]) of
215 _ -> error "newarray: type not implemented yet"
216 -- get length from stack, but leave it there
217 mov eax (Disp 0, esp)
218 mov ebx (tsize :: Word32)
219 -- multiple amount with native size of one element
220 mul ebx -- result is in eax
221 add eax (4 :: Word32) -- for "length" entry
222 -- push amount of bytes to allocate
225 pop eax -- ref to arraymemory
227 mov (Disp 0, eax) ebx -- store length at offset 0
228 push eax -- push ref again
229 emit (NEW objidx) = do
230 let objname = buildClassID cls objidx
231 amount <- liftIO $ getObjectSize objname
232 push (amount :: Word32)
234 -- TODO(bernhard): save reference somewhere for GC
235 -- set method table pointer
236 mtable <- liftIO $ getMethodTable objname
237 mov (Disp 0, eax) mtable
238 emit (CHECKCAST _) = nop -- TODO(bernhard): ...
239 emit ATHROW = nop -- TODO(bernhard): ...
242 and eax (0x000000ff :: Word32)
244 emit (BIPUSH val) = push (fromIntegral val :: Word32)
245 emit (SIPUSH val) = push (fromIntegral (fromIntegral val :: Int16) :: Word32)
246 emit ACONST_NULL = push (0 :: Word32)
247 emit (ICONST_M1) = push ((-1) :: Word32)
248 emit (ICONST_0) = push (0 :: Word32)
249 emit (ICONST_1) = push (1 :: Word32)
250 emit (ICONST_2) = push (2 :: Word32)
251 emit (ICONST_3) = push (3 :: Word32)
252 emit (ICONST_4) = push (4 :: Word32)
253 emit (ICONST_5) = push (5 :: Word32)
254 emit (ALOAD_ x) = emit (ILOAD_ x)
255 emit (ILOAD_ x) = push (Disp (cArgs_ x), ebp)
256 emit (ALOAD x) = emit (ILOAD x)
257 emit (ILOAD x) = push (Disp (cArgs x), ebp)
258 emit (ASTORE_ x) = emit (ISTORE_ x)
259 emit (ISTORE_ x) = do
261 mov (Disp (cArgs_ x), ebp) eax
262 emit (ASTORE x) = emit (ISTORE x)
265 mov (Disp (cArgs x), ebp) eax
267 emit (LDC1 x) = emit (LDC2 $ fromIntegral x)
269 value <- case constsPool cls M.! x of
270 (CString s) -> liftIO $ getUniqueStringAddr s
271 _ -> error "LDCI... missing impl."
273 emit (GETFIELD x) = do
274 offset <- emitFieldOffset x
275 push (Disp (fromIntegral offset), eax) -- get field
276 emit (PUTFIELD x) = do
277 pop ebx -- value to write
278 offset <- emitFieldOffset x
279 mov (Disp (fromIntegral offset), eax) ebx -- set field
281 emit IADD = do pop ebx; pop eax; add eax ebx; push eax
282 emit ISUB = do pop ebx; pop eax; sub eax ebx; push eax
283 emit IMUL = do pop ebx; pop eax; mul ebx; push eax
284 emit IDIV = do pop ebx; pop eax; div ebx; push eax
285 emit IREM = do pop ebx; pop eax; div ebx; push edx
286 emit IXOR = do pop ebx; pop eax; xor eax ebx; push eax
287 emit INEG = do pop eax; neg eax; push eax
289 add (Disp (cArgs x), ebp) (s8_w32 imm)
291 emit (IFNONNULL x) = emit (IF C_NE x)
292 emit (IFNULL x) = emit (IF C_EQ x)
293 emit (IF_ACMP cond x) = emit (IF_ICMP cond x)
294 emit (IF_ICMP cond _) = do
297 cmp ebx eax -- intel syntax is swapped (TODO(bernhard): test that plz)
300 emit (IF cond _) = do
302 cmp eax (0 :: Word32) -- TODO(bernhard): test that plz
306 let sid = case successor bb of OneTarget t -> t; _ -> error "bad"
307 jmp $ getLabel sid lmap
309 emit RETURN = do mov esp ebp; pop ebp; ret
310 emit ARETURN = emit IRETURN
311 emit IRETURN = do pop eax; emit RETURN
312 emit invalid = error $ "insn not implemented yet: " ++ show invalid
314 emitFieldOffset :: Word16 -> CodeGen e s Int32
315 emitFieldOffset x = do
316 pop eax -- this pointer
317 let (cname, fname) = buildFieldOffset cls x
318 liftIO $ getFieldOffset cname fname
320 emitIF :: CMP -> CodeGen e s ()
322 sid = case successor bb of TwoTarget _ t -> t; _ -> error "bad"
323 l = getLabel sid lmap
325 C_EQ -> je l; C_NE -> jne l
326 C_LT -> jl l; C_GT -> jg l
327 C_GE -> jge l; C_LE -> jle l
329 callMalloc :: CodeGen e s ()
331 calladdr <- getCurrentOffset
332 let w32_calladdr = 5 + calladdr
333 let malloaddr = fromIntegral getMallocObjectAddr :: Word32
334 call (malloaddr - w32_calladdr)
335 add esp (4 :: Word32)
338 -- for locals we use a different storage
339 cArgs :: Word8 -> Word32
340 cArgs x = if x' >= thisMethodArgCnt
341 -- TODO(bernhard): maybe s/(-4)/(-8)/
342 then fromIntegral $ (-4) * (x' - thisMethodArgCnt + 1)
343 else 4 + (thisMethodArgCnt * 4) - (4 * x')
344 where x' = fromIntegral x
346 cArgs_ :: IMM -> Word32
347 cArgs_ x = cArgs $ case x of I0 -> 0; I1 -> 1; I2 -> 2; I3 -> 3
349 thisMethodArgCnt :: Word32
350 thisMethodArgCnt = isNonStatic + fromIntegral (length args)
352 (Just m) = lookupMethodSig method sig cls
353 (MethodSignature args _) = sig
354 isNonStatic = if S.member ACC_STATIC (methodAccessFlags m)
355 then 0 else 1 -- one argument for the this pointer
358 -- sign extension from w8 to w32 (over s8)
359 -- unfortunately, hs-java is using Word8 everywhere (while
360 -- it should be Int8 actually)
361 s8_w32 :: Word8 -> Word32
362 s8_w32 w8 = fromIntegral s8
363 where s8 = fromIntegral w8 :: Int8