1 {-# LANGUAGE OverloadedStrings #-}
2 {-# LANGUAGE ForeignFunctionInterface #-}
3 module Mate.X86CodeGen where
5 import Prelude hiding (and, div)
7 import Data.BinaryState
10 import Data.List (genericLength)
11 import qualified Data.Map as M
12 import qualified Data.ByteString.Lazy as B
14 import Control.Applicative
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
27 import Mate.NativeSizes
31 import Mate.ClassHierarchy
32 import {-# SOURCE #-} Mate.MethodPool
36 foreign import ccall "&mallocObjectGC"
37 mallocObjectAddr :: FunPtr (Int -> IO CPtrdiff)
39 type EntryPoint = Ptr Word8
40 type EntryPointOffset = Int
41 type PatchInfo = (BlockID, EntryPointOffset)
43 type BBStarts = M.Map BlockID Int
45 type CompileInfo = (EntryPoint, BBStarts, Int, TrapMap)
48 emitFromBB :: Class Direct -> RawMethod -> CodeGen e s (CompileInfo, [Instruction])
49 emitFromBB cls method = do
50 let keys = M.keys hmap
51 llmap <- mapM (newNamedLabel . (++) "bb_" . show) keys
52 let lmap = zip keys llmap
56 sub esp (fromIntegral (rawLocals method) * ptrSize :: Word32)
58 (calls, bbstarts) <- efBB (0, hmap M.! 0) M.empty M.empty lmap
61 return ((ep, bbstarts, end, calls), d)
63 hmap = rawMapBB method
65 getLabel :: BlockID -> [(BlockID, Label)] -> Label
66 getLabel bid [] = error $ "label " ++ show bid ++ " not found"
67 getLabel i ((x,l):xs) = if i==x then l else getLabel i xs
69 efBB :: (BlockID, BasicBlock) -> TrapMap -> BBStarts -> [(BlockID, Label)] -> CodeGen e s (TrapMap, BBStarts)
70 efBB (bid, bb) calls bbstarts lmap =
71 if M.member bid bbstarts then
72 return (calls, bbstarts)
74 bb_offset <- getCodeOffset
75 let bbstarts' = M.insert bid bb_offset bbstarts
76 defineLabel $ getLabel bid lmap
77 cs <- mapM emit'' $ code bb
78 let calls' = calls `M.union` M.fromList (catMaybes cs)
80 Return -> return (calls', bbstarts')
82 -- TODO(bernhard): le dirty hax. see java/lang/Integer.toString(int, int)
84 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 forceRegDump :: CodeGen e s ()
96 mov esi (0x13371234 :: Word32)
100 getCurrentOffset :: CodeGen e s Word32
101 getCurrentOffset = do
102 ep <- (fromIntegral . ptrToIntPtr) `liftM` getEntryPoint
103 offset <- fromIntegral `liftM` getCodeOffset
106 emitInvoke :: Word16 -> Bool -> CodeGen e s (Maybe (Word32, TrapCause))
107 emitInvoke cpidx hasThis = do
108 let l = buildMethodID cls cpidx
109 newNamedLabel (show l) >>= defineLabel
110 -- like: call $0x01234567
111 calladdr <- emitSigIllTrap 5
112 let patcher reip = do
113 entryAddr <- liftIO $ getMethodEntry l
114 call (fromIntegral (entryAddr - (reip + 5)) :: NativeWord)
116 -- discard arguments on stack
117 let argcnt = ((if hasThis then 1 else 0) + methodGetArgsCount (methodNameTypeByIdx cls cpidx)) * ptrSize
118 when (argcnt > 0) (add esp argcnt)
119 -- push result on stack if method has a return value
120 when (methodHaveReturnValue cls cpidx) (push eax)
121 return $ Just (calladdr, StaticMethod patcher)
123 virtualCall :: Word16 -> Bool -> CodeGen e s (Maybe (Word32, TrapCause))
124 virtualCall cpidx isInterface = do
125 let mi@(MethodInfo methodname objname msig@(MethodSignature args _)) = buildMethodID cls cpidx
126 newNamedLabel (show mi) >>= defineLabel
127 -- get method offset for call @ runtime
128 let offset = if isInterface
129 then getInterfaceMethodOffset objname methodname (encode msig)
130 else getMethodOffset objname (methodname `B.append` encode msig)
131 let argsLen = genericLength args
132 -- objref lives somewhere on the argument stack
133 mov ebx (Disp (argsLen * ptrSize), esp)
135 mov ebx (Disp 0, ebx) -- get method-table-ptr, keep it in ebx
136 -- get method-table-ptr (or interface-table-ptr)
137 mov eax (Disp 0, ebx)
138 -- make actual (indirect) call
139 calladdr <- getCurrentOffset
140 -- will be patched to this: call (Disp 0xXXXXXXXX, eax)
142 -- discard arguments on stack (`+1' for "this")
143 let argcnt = ptrSize * (1 + methodGetArgsCount (methodNameTypeByIdx cls cpidx))
144 when (argcnt > 0) (add esp argcnt)
145 -- push result on stack if method has a return value
146 when (methodHaveReturnValue cls cpidx) (push eax)
147 -- note, that "mi" has the wrong class reference here.
148 -- we figure that out at run-time, in the methodpool,
149 -- depending on the method-table-ptr
150 return $ Just (calladdr, VirtualCall isInterface mi offset)
152 emit'' :: J.Instruction -> CodeGen e s (Maybe (Word32, TrapCause))
153 emit'' insn = newNamedLabel ("jvm_insn: " ++ show insn) >>= defineLabel >> emit' insn
155 emit' :: J.Instruction -> CodeGen e s (Maybe (Word32, TrapCause))
156 emit' (INVOKESPECIAL cpidx) = emitInvoke cpidx True
157 emit' (INVOKESTATIC cpidx) = emitInvoke cpidx False
158 emit' (INVOKEINTERFACE cpidx _) = virtualCall cpidx True
159 emit' (INVOKEVIRTUAL cpidx) = virtualCall cpidx False
161 emit' (PUTSTATIC cpidx) = do
163 trapaddr <- getCurrentOffset
164 mov (Addr 0x00000000) eax -- it's a trap
165 return $ Just (trapaddr, StaticField $ buildStaticFieldID cls cpidx)
166 emit' (GETSTATIC cpidx) = do
167 trapaddr <- getCurrentOffset
168 mov eax (Addr 0x00000000) -- it's a trap
170 return $ Just (trapaddr, StaticField $ buildStaticFieldID cls cpidx)
172 emit' (GETFIELD x) = do
173 pop eax -- this pointer
174 -- like: 099db064 ff b0 e4 14 00 00 pushl 5348(%eax)
175 trapaddr <- emitSigIllTrap 6
176 let patcher reip = do
177 let (cname, fname) = buildFieldOffset cls x
178 offset <- liftIO $ fromIntegral <$> getFieldOffset cname fname
179 push32RelEax (Disp offset) -- get field
181 return $ Just (trapaddr, ObjectField patcher)
182 emit' (PUTFIELD x) = do
183 pop ebx -- value to write
184 pop eax -- this pointer
185 -- like: 4581fc6b 89 98 30 7b 00 00 movl %ebx,31536(%eax)
186 trapaddr <- emitSigIllTrap 6
187 let patcher reip = do
188 let (cname, fname) = buildFieldOffset cls x
189 offset <- liftIO $ fromIntegral <$> getFieldOffset cname fname
190 mov32RelEbxEax (Disp offset) -- set field
192 return $ Just (trapaddr, ObjectField patcher)
194 emit' (INSTANCEOF cpidx) = do
196 -- place something like `mov edx $mtable_of_objref' instead
197 trapaddr <- emitSigIllTrap 4
199 let patcher reax reip = do
201 let classname = buildClassID cls cpidx
202 check <- liftIO $ isInstanceOf (fromIntegral reax) classname
204 then push (1 :: Word32)
205 else push (0 :: Word32)
207 return $ Just (trapaddr, InstanceOf patcher)
208 emit' (NEW objidx) = do
209 let objname = buildClassID cls objidx
210 -- place something like `push $objsize' instead
211 trapaddr <- emitSigIllTrap 5
213 -- 0x13371337 is just a placeholder; will be replaced with mtable ptr
214 mov (Disp 0, eax) (0x13371337 :: Word32)
215 mov (Disp 4, eax) (0x1337babe :: Word32)
216 let patcher reip = do
217 objsize <- liftIO $ getObjectSize objname
220 mtable <- liftIO $ getMethodTable objname
221 mov (Disp 0, eax) mtable
222 mov (Disp 4, eax) (0x1337babe :: Word32)
224 return $ Just (trapaddr, NewObject patcher)
227 trapaddr <- emitSigIllTrap 2
228 let patcher resp reip = do
231 return $ Just (trapaddr, ThrowException patcher)
233 emit' insn = emit insn >> return Nothing
235 emit :: J.Instruction -> CodeGen e s ()
236 emit POP = add esp (ptrSize :: Word32) -- drop value
237 emit DUP = push (Disp 0, esp)
238 emit DUP_X1 = do pop eax; pop ebx; push eax; push ebx; push eax
239 emit DUP_X2 = do pop eax; pop ebx; pop ecx; push eax; push ecx; push ebx; push eax
240 emit AASTORE = emit IASTORE
244 add ebx (1 :: Word32)
246 mov (ecx, ebx, S4) eax
250 add ebx (1 :: Word32)
252 mov (ecx, ebx, S1) eax -- TODO(bernhard): char is two byte
253 emit AALOAD = emit IALOAD
256 add ebx (1 :: Word32)
261 add ebx (1 :: Word32)
263 push (ecx, ebx, S1) -- TODO(bernhard): char is two byte
264 emit ARRAYLENGTH = do
267 emit (ANEWARRAY _) = emit (NEWARRAY 10) -- 10 == T_INT
268 emit (NEWARRAY typ) = do
269 let tsize = case decodeS (0 :: Integer) (B.pack [typ]) of
272 _ -> error "newarray: type not implemented yet"
273 -- get length from stack, but leave it there
274 mov eax (Disp 0, esp)
275 mov ebx (tsize :: Word32)
276 -- multiple amount with native size of one element
277 mul ebx -- result is in eax
278 add eax (ptrSize :: Word32) -- for "length" entry
279 -- push amount of bytes to allocate
282 pop eax -- ref to arraymemory
284 mov (Disp 0, eax) ebx -- store length at offset 0
285 push eax -- push ref again
287 emit (CHECKCAST _) = nop -- TODO(bernhard): ...
290 and eax (0x000000ff :: Word32)
292 emit (BIPUSH val) = push (fromIntegral val :: Word32)
293 emit (SIPUSH val) = push (fromIntegral (fromIntegral val :: Int16) :: Word32)
294 emit ACONST_NULL = push (0 :: Word32)
295 emit (ICONST_M1) = push ((-1) :: Word32)
296 emit (ICONST_0) = push (0 :: Word32)
297 emit (ICONST_1) = push (1 :: Word32)
298 emit (ICONST_2) = push (2 :: Word32)
299 emit (ICONST_3) = push (3 :: Word32)
300 emit (ICONST_4) = push (4 :: Word32)
301 emit (ICONST_5) = push (5 :: Word32)
303 emit (ALOAD_ x) = emit (ILOAD_ x)
304 emit (ILOAD_ x) = emit (ILOAD $ cArgs_ x)
305 emit (ALOAD x) = emit (ILOAD x)
306 emit (ILOAD x) = push (Disp (cArgs x), ebp)
308 emit (ASTORE_ x) = emit (ISTORE_ x)
309 emit (ISTORE_ x) = emit (ISTORE $ cArgs_ x)
310 emit (ASTORE x) = emit (ISTORE x)
313 mov (Disp (cArgs x), ebp) eax
315 emit (LDC1 x) = emit (LDC2 $ fromIntegral x)
317 value <- case constsPool cls M.! x of
318 (CString s) -> liftIO $ getUniqueStringAddr s
319 (CInteger i) -> liftIO $ return i
320 e -> error $ "LDCI... missing impl.: " ++ show e
323 emit IADD = do pop ebx; pop eax; add eax ebx; push eax
324 emit ISUB = do pop ebx; pop eax; sub eax ebx; push eax
325 emit IMUL = do pop ebx; pop eax; mul ebx; push eax
326 emit IDIV = do pop ebx; pop eax; xor edx edx; div ebx; push eax
327 emit IREM = do pop ebx; pop eax; xor edx edx; div ebx; push edx
328 emit IXOR = do pop ebx; pop eax; xor eax ebx; push eax
329 emit IUSHR = do pop ecx; pop eax; sar eax cl; push eax
330 emit INEG = do pop eax; neg eax; push eax
332 add (Disp (cArgs x), ebp) (s8_w32 imm)
334 emit (IFNONNULL x) = emit (IF C_NE x)
335 emit (IFNULL x) = emit (IF C_EQ x)
336 emit (IF_ACMP cond x) = emit (IF_ICMP cond x)
337 emit (IF_ICMP cond _) = do
340 cmp ebx eax -- intel syntax is swapped (TODO(bernhard): test that plz)
343 emit (IF cond _) = do
345 cmp eax (0 :: Word32) -- TODO(bernhard): test that plz
349 let sid = case successor bb of OneTarget t -> t; _ -> error "bad"
350 jmp $ getLabel sid lmap
352 emit RETURN = do mov esp ebp; pop ebp; ret
353 emit ARETURN = emit IRETURN
354 emit IRETURN = do pop eax; emit RETURN
355 emit invalid = error $ "insn not implemented yet: " ++ show invalid
357 emitIF :: CMP -> CodeGen e s ()
359 sid = case successor bb of TwoTarget _ t -> t; _ -> error "bad"
360 l = getLabel sid lmap
361 sid2 = case successor bb of TwoTarget t _ -> t; _ -> error "bad"
362 l2 = getLabel sid2 lmap
365 C_EQ -> je l; C_NE -> jne l
366 C_LT -> jl l; C_GT -> jg l
367 C_GE -> jge l; C_LE -> jle l
368 -- TODO(bernhard): ugly workaround, to get broken emitBB working
369 -- (it didn't work for gnu/classpath/SystemProperties.java)
372 emitSigIllTrap :: Int -> CodeGen e s NativeWord
373 emitSigIllTrap traplen = do
374 when (traplen < 2) (error "emitSigIllTrap: trap len too short")
375 trapaddr <- getCurrentOffset
376 -- 0xffff causes SIGILL
377 emit8 (0xff :: Word8); emit8 (0xff :: Word8)
378 -- fill rest up with NOPs
379 sequence_ [nop | _ <- [1 .. (traplen - 2)]]
383 -- for locals we use a different storage
384 cArgs :: Word8 -> Word32
385 cArgs x = ptrSize * (argcount - x' + isLocal)
388 argcount = rawArgCount method
389 isLocal = if x' >= argcount then (-1) else 1
391 cArgs_ :: IMM -> Word8
392 cArgs_ x = case x of I0 -> 0; I1 -> 1; I2 -> 2; I3 -> 3
395 -- sign extension from w8 to w32 (over s8)
396 -- unfortunately, hs-java is using Word8 everywhere (while
397 -- it should be Int8 actually)
398 s8_w32 :: Word8 -> Word32
399 s8_w32 w8 = fromIntegral s8
400 where s8 = fromIntegral w8 :: Int8
402 callMalloc :: CodeGen e s ()
404 call mallocObjectAddr
405 add esp (ptrSize :: Word32)
409 -- harpy tries to cut immediates (or displacements), if they fit in 8bit.
410 -- however, this is bad for patching so we want to put always 32bit.
413 push32 :: Word32 -> CodeGen e s ()
414 push32 imm32 = emit8 0x68 >> emit32 imm32
417 call32Eax :: Disp -> CodeGen e s ()
418 call32Eax (Disp disp32) = emit8 0xff >> emit8 0x90 >> emit32 disp32
421 push32RelEax :: Disp -> CodeGen e s ()
422 push32RelEax (Disp disp32) = emit8 0xff >> emit8 0xb0 >> emit32 disp32
424 -- mov %ebx, disp32(%eax)
425 mov32RelEbxEax :: Disp -> CodeGen e s ()
426 mov32RelEbxEax (Disp disp32) = emit8 0x89 >> emit8 0x98 >> emit32 disp32