1 {-# LANGUAGE OverloadedStrings #-}
2 {-# LANGUAGE ForeignFunctionInterface #-}
3 module Mate.X86CodeGen where
8 import qualified Data.Map as M
9 import qualified Data.ByteString.Lazy as B
13 import Foreign.C.Types
17 import qualified JVM.Assembler as J
18 import JVM.Assembler hiding (Instruction)
23 import Harpy.X86Disassembler
25 import Mate.BasicBlocks
28 foreign import ccall "dynamic"
29 code_int :: FunPtr (CInt -> CInt -> IO CInt) -> (CInt -> CInt -> IO CInt)
31 foreign import ccall "getaddr"
34 foreign import ccall "callertrap"
37 foreign import ccall "register_signal"
38 register_signal :: IO ()
40 foreign import ccall "get_cmap"
41 get_cmap :: IO (Ptr ())
43 foreign import ccall "set_cmap"
44 set_cmap :: Ptr () -> IO ()
46 test_01, test_02, test_03 :: IO ()
49 (entry, end) <- testCase "./tests/Fib.class" "fib"
50 let entryFuncPtr = ((castPtrToFunPtr entry) :: FunPtr (CInt -> CInt -> IO CInt))
53 result <- code_int entryFuncPtr x 0
54 let iresult :: Int; iresult = fromIntegral result
55 let kk :: String; kk = if iresult == (fib x) then "OK" else "FAIL (" ++ (show (fib x)) ++ ")"
56 printf "result of fib(%2d): %3d\t\t%s\n" (fromIntegral x :: Int) iresult kk
57 ) $ ([0..10] :: [CInt])
58 printf "patched disasm:\n"
59 Right newdisasm <- disassembleBlock entry end
60 mapM_ (putStrLn . showAtt) newdisasm
65 | otherwise = (fib (n - 1)) + (fib (n - 2))
69 (entry,_) <- testCase "./tests/While.class" "f"
70 let entryFuncPtr = ((castPtrToFunPtr entry) :: FunPtr (CInt -> CInt -> IO CInt))
71 result <- code_int entryFuncPtr 5 4
72 let iresult :: Int; iresult = fromIntegral result
73 let kk :: String; kk = if iresult == 15 then "OK" else "FAIL"
74 printf "result of f(5,4): %3d\t\t%s\n" iresult kk
76 result2 <- code_int entryFuncPtr 4 3
77 let iresult2 :: Int; iresult2 = fromIntegral result2
78 let kk2 :: String; kk2 = if iresult2 == 10 then "OK" else "FAIL"
79 printf "result of f(4,3): %3d\t\t%s\n" iresult2 kk2
83 (entry,_) <- testCase "./tests/While.class" "g"
84 let entryFuncPtr = ((castPtrToFunPtr entry) :: FunPtr (CInt -> CInt -> IO CInt))
85 result <- code_int entryFuncPtr 5 4
86 let iresult :: Int; iresult = fromIntegral result
87 let kk :: String; kk = if iresult == 15 then "OK" else "FAIL"
88 printf "result of g(5,4): %3d\t\t%s\n" iresult kk
90 result2 <- code_int entryFuncPtr 4 3
91 let iresult2 :: Int; iresult2 = fromIntegral result2
92 let kk2 :: String; kk2 = if iresult2 == 10 then "OK" else "FAIL"
93 printf "result of g(4,3): %3d\t\t%s\n" iresult2 kk2
96 testCase :: String -> B.ByteString -> IO (Ptr Word8, Int)
97 testCase cf method = do
98 cls <- parseClassFile cf
99 hmap <- parseMethod cls method
102 Nothing -> error "sorry, no code generation"
104 let ebb = emitFromBB cls hmap'
105 (_, Right ((entry, bbstarts, end, _), disasm)) <- runCodeGen ebb () ()
106 let int_entry = ((fromIntegral $ ptrToIntPtr entry) :: Int)
108 mapM_ (putStrLn . showAtt) disasm
109 printf "basicblocks addresses:\n"
110 let b = map (\(x,y) -> (x,y + int_entry)) $ M.toList bbstarts
111 mapM_ (\(x,y) -> printf "\tBasicBlock %2d starts at 0x%08x\n" x y) b
114 type EntryPoint = Ptr Word8
115 type EntryPointOffset = Int
116 type PatchInfo = (BlockID, EntryPointOffset)
118 type BBStarts = M.Map BlockID Int
120 type CompileInfo = (EntryPoint, BBStarts, Int, CMap)
122 -- B.ByteString: encoded name: <Class>.<methodname><signature>
123 -- Class Resolved: classfile
124 -- Word16: index of invoke-instruction
125 type MethodInfo = (B.ByteString, Class Resolved, Word16)
127 -- Word32 = point of method call in generated code
128 -- MethodInfo = relevant information about callee
129 type CMap = M.Map Word32 MethodInfo
132 emitFromBB :: Class Resolved -> MapBB -> CodeGen e s (CompileInfo, [Instruction])
133 emitFromBB cls hmap = do
134 llmap <- sequence [newNamedLabel ("bb_" ++ show x) | (x,_) <- M.toList hmap]
135 let lmap = zip (Prelude.fst $ unzip $ M.toList hmap) llmap
140 (calls, bbstarts) <- efBB (0,(hmap M.! 0)) M.empty M.empty lmap
143 return ((ep, bbstarts, end, calls), d)
145 getLabel :: BlockID -> [(BlockID, Label)] -> Label
146 getLabel _ [] = error "label not found!"
147 getLabel i ((x,l):xs) = if i==x then l else getLabel i xs
149 efBB :: (BlockID, BasicBlock) -> CMap -> BBStarts -> [(BlockID, Label)] -> CodeGen e s (CMap, BBStarts)
150 efBB (bid, bb) calls bbstarts lmap =
151 if M.member bid bbstarts then
152 return (calls, bbstarts)
154 bb_offset <- getCodeOffset
155 let bbstarts' = M.insert bid bb_offset bbstarts
156 defineLabel $ getLabel bid lmap
157 cs <- mapM emit' $ code bb
158 let calls' = calls `M.union` (M.fromList $ catMaybes cs)
160 Return -> return (calls', bbstarts')
162 efBB (t, hmap M.! t) calls' bbstarts' lmap
164 efBB (t, hmap M.! t) calls' bbstarts' lmap
165 TwoTarget t1 t2 -> do
166 (calls'', bbstarts'') <- efBB (t1, hmap M.! t1) calls' bbstarts' lmap
167 efBB (t2, hmap M.! t2) calls'' bbstarts'' lmap
168 -- TODO(bernhard): also use metainformation
169 -- TODO(bernhard): implement `emit' as function which accepts a list of
170 -- instructions, so we can use patterns for optimizations
172 emit' :: J.Instruction -> CodeGen e s (Maybe (Word32, MethodInfo))
173 emit' (INVOKESTATIC cpidx) = do
175 let w32_ep = (fromIntegral $ ptrToIntPtr ep) :: Word32
176 let l = buildMethodID cls cpidx
177 calladdr <- getCodeOffset
178 let w32_calladdr = w32_ep + (fromIntegral calladdr) :: Word32
179 newNamedLabel (toString l) >>= defineLabel
180 -- causes SIGILL. in the signal handler we patch it to the acutal call.
181 -- place a nop at the end, therefore the disasm doesn't screw up
182 emit32 (0xffff9090 :: Word32) >> emit8 (0x90 :: Word8)
183 -- discard arguments on stack
184 let argcnt = (methodGetArgsCount cls cpidx) * 4
185 when (argcnt > 0) (add esp argcnt)
186 -- push result on stack if method has a return value
187 when (methodHaveReturnValue cls cpidx) (push eax)
188 return $ Just $ (w32_calladdr, (l, cls, cpidx))
189 emit' insn = emit insn >> return Nothing
191 emit :: J.Instruction -> CodeGen e s ()
192 emit POP = do -- print dropped value
194 let w32_ep = (fromIntegral $ ptrToIntPtr ep) :: Word32
195 -- '5' is the size of the `call' instruction ( + immediate)
196 calladdr <- getCodeOffset
197 let w32_calladdr = 5 + w32_ep + (fromIntegral calladdr) :: Word32
198 let trapaddr = (fromIntegral getaddr :: Word32)
199 call (trapaddr - w32_calladdr)
200 add esp (4 :: Word32)
201 emit (BIPUSH val) = push ((fromIntegral val) :: Word32)
202 emit (SIPUSH val) = push ((fromIntegral $ ((fromIntegral val) :: Int16)) :: Word32)
203 emit (ICONST_0) = push (0 :: Word32)
204 emit (ICONST_1) = push (1 :: Word32)
205 emit (ICONST_2) = push (2 :: Word32)
206 emit (ICONST_4) = push (4 :: Word32)
207 emit (ICONST_5) = push (5 :: Word32)
209 push (Disp (cArgs_ x), ebp)
210 emit (ISTORE_ x) = do
212 mov (Disp (cArgs_ x), ebp) eax
213 emit IADD = do pop ebx; pop eax; add eax ebx; push eax
214 emit ISUB = do pop ebx; pop eax; sub eax ebx; push eax
215 emit IMUL = do pop ebx; pop eax; mul ebx; push eax
216 emit (IINC x imm) = do
217 add (Disp (cArgs x), ebp) (s8_w32 imm)
219 emit (IF_ICMP cond _) = do
222 cmp ebx eax -- intel syntax is swapped (TODO(bernhard): test that plz)
223 let sid = case successor bb of TwoTarget _ t -> t; _ -> error "bad"
224 let l = getLabel sid lmap
226 C_EQ -> je l; C_NE -> jne l
227 C_LT -> jl l; C_GT -> jg l
228 C_GE -> jge l; C_LE -> jle l
230 emit (IF cond _) = do
232 cmp eax (0 :: Word32) -- TODO(bernhard): test that plz
233 let sid = case successor bb of TwoTarget _ t -> t; _ -> error "bad"
234 let l = getLabel sid lmap
236 C_EQ -> je l; C_NE -> jne l
237 C_LT -> jl l; C_GT -> jg l
238 C_GE -> jge l; C_LE -> jle l
241 let sid = case successor bb of OneTarget t -> t; _ -> error "bad"
242 jmp $ getLabel sid lmap
244 emit RETURN = do mov esp ebp; pop ebp; ret
250 emit _ = do cmovbe eax eax -- dummy
252 cArgs x = (8 + 4 * (fromIntegral x))
253 cArgs_ x = (8 + 4 * case x of I0 -> 0; I1 -> 1; I2 -> 2; I3 -> 3)
255 -- sign extension from w8 to w32 (over s8)
256 -- unfortunately, hs-java is using Word8 everywhere (while
257 -- it should be Int8 actually)
258 s8_w32 :: Word8 -> Word32
259 s8_w32 w8 = fromIntegral s8
260 where s8 = (fromIntegral w8) :: Int8