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 GHC.Exts ( Int(I#), addr2Int# )
31 import GHC.Ptr ( Ptr(..) )
34 %************************************************************************
36 \subsection{Manufacturing of info tables for DataCons}
38 %************************************************************************
42 type ItblPtr = Ptr StgInfoTable
43 type ItblEnv = FiniteMap Name ItblPtr
46 -- Make info tables for the data decls in this module
47 mkITbls :: [TyCon] -> IO ItblEnv
48 mkITbls [] = return emptyFM
49 mkITbls (tc:tcs) = do itbls <- mkITbl tc
51 return (itbls `plusFM` itbls2)
53 mkITbl :: TyCon -> IO ItblEnv
55 | not (isDataTyCon tc)
57 | dcs `lengthIs` n -- paranoia; this is an assertion.
58 = make_constr_itbls dcs
60 dcs = tyConDataCons tc
61 n = tyConFamilySize tc
64 cONSTR = 1 -- as defined in ghc/includes/ClosureTypes.h
66 -- Assumes constructors are numbered from zero, not one
67 make_constr_itbls :: [DataCon] -> IO ItblEnv
68 make_constr_itbls cons
69 | listLengthCmp cons 8 /= GT -- <= 8 elements in the list
70 = do is <- mapM mk_vecret_itbl (zip cons [0..])
73 = do is <- mapM mk_dirret_itbl (zip cons [0..])
76 mk_vecret_itbl (dcon, conNo)
77 = mk_itbl dcon conNo (vecret_entry conNo)
78 mk_dirret_itbl (dcon, conNo)
79 = mk_itbl dcon conNo stg_interp_constr_entry
81 mk_itbl :: DataCon -> Int -> Ptr () -> IO (Name,ItblPtr)
82 mk_itbl dcon conNo entry_addr
83 = let (tot_wds, ptr_wds, _)
84 = mkVirtHeapOffsets typePrimRep (dataConRepArgTys dcon)
86 nptrs = tot_wds - ptr_wds
88 | ptrs + nptrs >= mIN_SIZE_NonUpdHeapObject = nptrs
89 | otherwise = mIN_SIZE_NonUpdHeapObject - ptrs
91 ptrs = fromIntegral ptrs,
92 nptrs = fromIntegral nptrs_really,
93 tipe = fromIntegral cONSTR,
94 srtlen = fromIntegral conNo,
97 -- Make a piece of code to jump to "entry_label".
98 -- This is the only arch-dependent bit.
99 code = mkJumpToAddr entry_addr
102 --putStrLn ("SIZE of itbl is " ++ show (sizeOf itbl))
103 --putStrLn ("# ptrs of itbl is " ++ show ptrs)
104 --putStrLn ("# nptrs of itbl is " ++ show nptrs_really)
106 return (getName dcon, addr `plusPtr` 8)
109 -- Make code which causes a jump to the given address. This is the
110 -- only arch-dependent bit of the itbl story. The returned list is
111 -- itblCodeLength elements (bytes) long.
113 -- For sparc_TARGET_ARCH, i386_TARGET_ARCH, etc.
114 #include "nativeGen/NCG.h"
116 itblCodeLength :: Int
117 itblCodeLength = length (mkJumpToAddr undefined)
119 mkJumpToAddr :: Ptr () -> [ItblCode]
121 ptrToInt (Ptr a#) = I# (addr2Int# a#)
123 #if sparc_TARGET_ARCH
124 -- After some consideration, we'll try this, where
125 -- 0x55555555 stands in for the address to jump to.
126 -- According to ghc/includes/MachRegs.h, %g3 is very
127 -- likely indeed to be baggable.
129 -- 0000 07155555 sethi %hi(0x55555555), %g3
130 -- 0004 8610E155 or %g3, %lo(0x55555555), %g3
131 -- 0008 81C0C000 jmp %g3
134 type ItblCode = Word32
136 = let w32 = fromIntegral (ptrToInt a)
138 hi22, lo10 :: Word32 -> Word32
140 hi22 x = (x `shiftR` 10) .&. 0x3FFFF
142 in [ 0x07000000 .|. (hi22 w32),
143 0x8610E000 .|. (lo10 w32),
147 #elif powerpc_TARGET_ARCH
148 -- We'll use r12, for no particular reason.
149 -- 0xDEADBEEF stands for the adress:
150 -- 3D80DEAD lis r12,0xDEAD
151 -- 618CBEEF ori r12,r12,0xBEEF
152 -- 7D8903A6 mtctr r12
155 type ItblCode = Word32
157 let w32 = fromIntegral (ptrToInt a)
158 hi16 x = (x `shiftR` 16) .&. 0xFFFF
159 lo16 x = x .&. 0xFFFF
161 0x3D800000 .|. hi16 w32,
162 0x618C0000 .|. lo16 w32,
163 0x7D8903A6, 0x4E800420
166 #elif i386_TARGET_ARCH
167 -- Let the address to jump to be 0xWWXXYYZZ.
168 -- Generate movl $0xWWXXYYZZ,%eax ; jmp *%eax
170 -- B8 ZZ YY XX WW FF E0
172 type ItblCode = Word8
174 = let w32 = fromIntegral (ptrToInt a)
177 = [0xB8, byte 0 w32, byte 1 w32,
178 byte 2 w32, byte 3 w32,
183 #elif alpha_TARGET_ARCH
184 type ItblCode = Word32
186 = [ 0xc3800000 -- br at, .+4
187 , 0xa79c000c -- ldq at, 12(at)
188 , 0x6bfc0000 -- jmp (at) # with zero hint -- oh well
190 , fromIntegral (w64 .&. 0x0000FFFF)
191 , fromIntegral ((w64 `shiftR` 32) .&. 0x0000FFFF) ]
192 where w64 = fromIntegral (ptrToInt a) :: Word64
195 type ItblCode = Word32
201 byte :: Int -> Word32 -> Word8
202 byte 0 w = fromIntegral (w .&. 0xFF)
203 byte 1 w = fromIntegral ((w `shiftR` 8) .&. 0xFF)
204 byte 2 w = fromIntegral ((w `shiftR` 16) .&. 0xFF)
205 byte 3 w = fromIntegral ((w `shiftR` 24) .&. 0xFF)
208 vecret_entry 0 = stg_interp_constr1_entry
209 vecret_entry 1 = stg_interp_constr2_entry
210 vecret_entry 2 = stg_interp_constr3_entry
211 vecret_entry 3 = stg_interp_constr4_entry
212 vecret_entry 4 = stg_interp_constr5_entry
213 vecret_entry 5 = stg_interp_constr6_entry
214 vecret_entry 6 = stg_interp_constr7_entry
215 vecret_entry 7 = stg_interp_constr8_entry
217 -- entry point for direct returns for created constr itbls
218 foreign label "stg_interp_constr_entry" stg_interp_constr_entry :: Ptr ()
219 -- and the 8 vectored ones
220 foreign label "stg_interp_constr1_entry" stg_interp_constr1_entry :: Ptr ()
221 foreign label "stg_interp_constr2_entry" stg_interp_constr2_entry :: Ptr ()
222 foreign label "stg_interp_constr3_entry" stg_interp_constr3_entry :: Ptr ()
223 foreign label "stg_interp_constr4_entry" stg_interp_constr4_entry :: Ptr ()
224 foreign label "stg_interp_constr5_entry" stg_interp_constr5_entry :: Ptr ()
225 foreign label "stg_interp_constr6_entry" stg_interp_constr6_entry :: Ptr ()
226 foreign label "stg_interp_constr7_entry" stg_interp_constr7_entry :: Ptr ()
227 foreign label "stg_interp_constr8_entry" stg_interp_constr8_entry :: Ptr ()
233 -- Ultra-minimalist version specially for constructors
234 #if SIZEOF_VOID_P == 8
235 type HalfWord = Word32
237 type HalfWord = Word16
240 data StgInfoTable = StgInfoTable {
248 instance Storable StgInfoTable where
256 fieldSz (head.code) itbl * itblCodeLength]
262 = runState (castPtr a0)
263 $ do store (ptrs itbl)
267 sequence_ (map store (code itbl))
270 = runState (castPtr a0)
275 code <- sequence (replicate itblCodeLength load)
285 fieldSz :: (Storable a, Storable b) => (a -> b) -> a -> Int
286 fieldSz sel x = sizeOf (sel x)
288 newtype State s m a = State (s -> m (s, a))
290 instance Monad m => Monad (State s m) where
291 return a = State (\s -> return (s, a))
292 State m >>= k = State (\s -> m s >>= \(s', a) -> case k a of State n -> n s')
293 fail str = State (\s -> fail str)
295 class (Monad m, Monad (t m)) => MonadT t m where
298 instance Monad m => MonadT (State s) m where
299 lift m = State (\s -> m >>= \a -> return (s, a))
301 runState :: (Monad m) => s -> State s m a -> m a
302 runState s (State m) = m s >>= return . snd
304 type PtrIO = State (Ptr Word8) IO
306 advance :: Storable a => PtrIO (Ptr a)
307 advance = State adv where
308 adv addr = case castPtr addr of { addrCast -> return
309 (addr `plusPtr` sizeOfPointee addrCast, addrCast) }
311 sizeOfPointee :: (Storable a) => Ptr a -> Int
312 sizeOfPointee addr = sizeOf (typeHack addr)
313 where typeHack = undefined :: Ptr a -> a
315 store :: Storable a => a -> PtrIO ()
316 store x = do addr <- advance
319 load :: Storable a => PtrIO a
320 load = do addr <- advance