2 % (c) The University of Glasgow 2000
4 \section[ByteCodeItbls]{Generate infotables for interpreter-made bytecodes}
8 {-# OPTIONS -optc-DNON_POSIX_SOURCE #-}
10 module ByteCodeItbls ( ItblEnv, ItblPtr, mkITbls ) where
12 #include "HsVersions.h"
14 import Name ( Name, getName )
15 import FiniteMap ( FiniteMap, listToFM, emptyFM, plusFM )
16 import Type ( typePrimRep )
17 import DataCon ( DataCon, dataConRepArgTys )
18 import TyCon ( TyCon, tyConFamilySize, isDataTyCon, tyConDataCons )
19 import Constants ( mIN_SIZE_NonUpdHeapObject )
20 import ClosureInfo ( mkVirtHeapOffsets )
21 import FastString ( FastString(..) )
22 import Util ( lengthIs, listLengthCmp )
24 import Foreign ( Storable(..), Word8, Word16, Word32, Word64,
25 malloc, castPtr, plusPtr )
26 import Bits ( Bits(..), shiftR )
28 import Monad ( liftM )
30 import GlaExts ( Int(I#), addr2Int# )
31 #if __GLASGOW_HASKELL__ < 503
32 import Ptr ( Ptr(..) )
34 import GHC.Ptr ( Ptr(..) )
38 %************************************************************************
40 \subsection{Manufacturing of info tables for DataCons}
42 %************************************************************************
46 type ItblPtr = Ptr StgInfoTable
47 type ItblEnv = FiniteMap Name ItblPtr
50 -- Make info tables for the data decls in this module
51 mkITbls :: [TyCon] -> IO ItblEnv
52 mkITbls [] = return emptyFM
53 mkITbls (tc:tcs) = do itbls <- mkITbl tc
55 return (itbls `plusFM` itbls2)
57 mkITbl :: TyCon -> IO ItblEnv
59 | not (isDataTyCon tc)
61 | dcs `lengthIs` n -- paranoia; this is an assertion.
62 = make_constr_itbls dcs
64 dcs = tyConDataCons tc
65 n = tyConFamilySize tc
68 cONSTR = 1 -- as defined in ghc/includes/ClosureTypes.h
70 -- Assumes constructors are numbered from zero, not one
71 make_constr_itbls :: [DataCon] -> IO ItblEnv
72 make_constr_itbls cons
73 | listLengthCmp cons 8 /= GT -- <= 8 elements in the list
74 = do is <- mapM mk_vecret_itbl (zip cons [0..])
77 = do is <- mapM mk_dirret_itbl (zip cons [0..])
80 mk_vecret_itbl (dcon, conNo)
81 = mk_itbl dcon conNo (vecret_entry conNo)
82 mk_dirret_itbl (dcon, conNo)
83 = mk_itbl dcon conNo stg_interp_constr_entry
85 mk_itbl :: DataCon -> Int -> Ptr () -> IO (Name,ItblPtr)
86 mk_itbl dcon conNo entry_addr
87 = let (tot_wds, ptr_wds, _)
88 = mkVirtHeapOffsets typePrimRep (dataConRepArgTys dcon)
90 nptrs = tot_wds - ptr_wds
92 | ptrs + nptrs >= mIN_SIZE_NonUpdHeapObject = nptrs
93 | otherwise = mIN_SIZE_NonUpdHeapObject - ptrs
95 ptrs = fromIntegral ptrs,
96 nptrs = fromIntegral nptrs_really,
97 tipe = fromIntegral cONSTR,
98 srtlen = fromIntegral conNo,
101 -- Make a piece of code to jump to "entry_label".
102 -- This is the only arch-dependent bit.
103 code = mkJumpToAddr entry_addr
106 --putStrLn ("SIZE of itbl is " ++ show (sizeOf itbl))
107 --putStrLn ("# ptrs of itbl is " ++ show ptrs)
108 --putStrLn ("# nptrs of itbl is " ++ show nptrs_really)
110 return (getName dcon, addr `plusPtr` 8)
113 -- Make code which causes a jump to the given address. This is the
114 -- only arch-dependent bit of the itbl story. The returned list is
115 -- itblCodeLength elements (bytes) long.
117 -- For sparc_TARGET_ARCH, i386_TARGET_ARCH, etc.
118 #include "nativeGen/NCG.h"
120 itblCodeLength :: Int
121 itblCodeLength = length (mkJumpToAddr undefined)
123 mkJumpToAddr :: Ptr () -> [ItblCode]
125 ptrToInt (Ptr a#) = I# (addr2Int# a#)
127 #if sparc_TARGET_ARCH
128 -- After some consideration, we'll try this, where
129 -- 0x55555555 stands in for the address to jump to.
130 -- According to ghc/includes/MachRegs.h, %g3 is very
131 -- likely indeed to be baggable.
133 -- 0000 07155555 sethi %hi(0x55555555), %g3
134 -- 0004 8610E155 or %g3, %lo(0x55555555), %g3
135 -- 0008 81C0C000 jmp %g3
138 type ItblCode = Word32
140 = let w32 = fromIntegral (ptrToInt a)
142 hi22, lo10 :: Word32 -> Word32
144 hi22 x = (x `shiftR` 10) .&. 0x3FFFF
146 in [ 0x07000000 .|. (hi22 w32),
147 0x8610E000 .|. (lo10 w32),
151 #elif powerpc_TARGET_ARCH
152 -- We'll use r12, for no particular reason.
153 -- 0xDEADBEEF stands for the adress:
154 -- 3D80DEAD lis r12,0xDEAD
155 -- 618CBEEF ori r12,r12,0xBEEF
156 -- 7D8903A6 mtctr r12
159 type ItblCode = Word32
161 let w32 = fromIntegral (ptrToInt a)
162 hi16 x = (x `shiftR` 16) .&. 0xFFFF
163 lo16 x = x .&. 0xFFFF
165 0x3D800000 .|. hi16 w32,
166 0x618C0000 .|. lo16 w32,
167 0x7D8903A6, 0x4E800420
170 #elif i386_TARGET_ARCH
171 -- Let the address to jump to be 0xWWXXYYZZ.
172 -- Generate movl $0xWWXXYYZZ,%eax ; jmp *%eax
174 -- B8 ZZ YY XX WW FF E0
176 type ItblCode = Word8
178 = let w32 = fromIntegral (ptrToInt a)
181 = [0xB8, byte 0 w32, byte 1 w32,
182 byte 2 w32, byte 3 w32,
187 #elif alpha_TARGET_ARCH
188 type ItblCode = Word32
190 = [ 0xc3800000 -- br at, .+4
191 , 0xa79c000c -- ldq at, 12(at)
192 , 0x6bfc0000 -- jmp (at) # with zero hint -- oh well
194 , fromIntegral (w64 .&. 0x0000FFFF)
195 , fromIntegral ((w64 `shiftR` 32) .&. 0x0000FFFF) ]
196 where w64 = fromIntegral (ptrToInt a) :: Word64
199 type ItblCode = Word32
205 byte :: Int -> Word32 -> Word8
206 byte 0 w = fromIntegral (w .&. 0xFF)
207 byte 1 w = fromIntegral ((w `shiftR` 8) .&. 0xFF)
208 byte 2 w = fromIntegral ((w `shiftR` 16) .&. 0xFF)
209 byte 3 w = fromIntegral ((w `shiftR` 24) .&. 0xFF)
212 vecret_entry 0 = stg_interp_constr1_entry
213 vecret_entry 1 = stg_interp_constr2_entry
214 vecret_entry 2 = stg_interp_constr3_entry
215 vecret_entry 3 = stg_interp_constr4_entry
216 vecret_entry 4 = stg_interp_constr5_entry
217 vecret_entry 5 = stg_interp_constr6_entry
218 vecret_entry 6 = stg_interp_constr7_entry
219 vecret_entry 7 = stg_interp_constr8_entry
221 -- entry point for direct returns for created constr itbls
222 foreign label "stg_interp_constr_entry" stg_interp_constr_entry :: Ptr ()
223 -- and the 8 vectored ones
224 foreign label "stg_interp_constr1_entry" stg_interp_constr1_entry :: Ptr ()
225 foreign label "stg_interp_constr2_entry" stg_interp_constr2_entry :: Ptr ()
226 foreign label "stg_interp_constr3_entry" stg_interp_constr3_entry :: Ptr ()
227 foreign label "stg_interp_constr4_entry" stg_interp_constr4_entry :: Ptr ()
228 foreign label "stg_interp_constr5_entry" stg_interp_constr5_entry :: Ptr ()
229 foreign label "stg_interp_constr6_entry" stg_interp_constr6_entry :: Ptr ()
230 foreign label "stg_interp_constr7_entry" stg_interp_constr7_entry :: Ptr ()
231 foreign label "stg_interp_constr8_entry" stg_interp_constr8_entry :: Ptr ()
237 -- Ultra-minimalist version specially for constructors
238 #if SIZEOF_VOID_P == 8
239 type HalfWord = Word32
241 type HalfWord = Word16
244 data StgInfoTable = StgInfoTable {
252 instance Storable StgInfoTable where
260 fieldSz (head.code) itbl * itblCodeLength]
266 = runState (castPtr a0)
267 $ do store (ptrs itbl)
271 sequence_ (map store (code itbl))
274 = runState (castPtr a0)
279 code <- sequence (replicate itblCodeLength load)
289 fieldSz :: (Storable a, Storable b) => (a -> b) -> a -> Int
290 fieldSz sel x = sizeOf (sel x)
292 newtype State s m a = State (s -> m (s, a))
294 instance Monad m => Monad (State s m) where
295 return a = State (\s -> return (s, a))
296 State m >>= k = State (\s -> m s >>= \(s', a) -> case k a of State n -> n s')
297 fail str = State (\s -> fail str)
299 class (Monad m, Monad (t m)) => MonadT t m where
302 instance Monad m => MonadT (State s) m where
303 lift m = State (\s -> m >>= \a -> return (s, a))
305 runState :: (Monad m) => s -> State s m a -> m a
306 runState s (State m) = m s >>= return . snd
308 type PtrIO = State (Ptr Word8) IO
310 advance :: Storable a => PtrIO (Ptr a)
311 advance = State adv where
312 adv addr = case castPtr addr of { addrCast -> return
313 (addr `plusPtr` sizeOfPointee addrCast, addrCast) }
315 sizeOfPointee :: (Storable a) => Ptr a -> Int
316 sizeOfPointee addr = sizeOf (typeHack addr)
317 where typeHack = undefined :: Ptr a -> a
319 store :: Storable a => a -> PtrIO ()
320 store x = do addr <- advance
323 load :: Storable a => PtrIO a
324 load = do addr <- advance