1 % -----------------------------------------------------------------------------
2 % $Id: PrelStorable.lhs,v 1.5 2001/04/13 21:37:43 panne Exp $
4 % (c) The FFI task force, 2000
7 A class for primitive marshaling
14 sizeOf, -- :: a -> Int
15 alignment, -- :: a -> Int
16 peekElemOff, -- :: Ptr a -> Int -> IO a
17 pokeElemOff, -- :: Ptr a -> Int -> a -> IO ()
18 peekByteOff, -- :: Ptr b -> Int -> IO a
19 pokeByteOff, -- :: Ptr b -> Int -> a -> IO ()
20 peek, -- :: Ptr a -> IO a
21 poke, -- :: Ptr a -> a -> IO ()
22 destruct) -- :: Ptr a -> IO ()
27 import Char ( chr, ord )
28 import Monad ( liftM )
30 #ifdef __GLASGOW_HASKELL__
31 import PrelStable ( StablePtr )
46 Minimal complete definition: sizeOf, alignment, and one definition
47 in each of the peek/poke families.
50 class Storable a where
52 -- sizeOf/alignment *never* use their first argument
56 -- replacement for read-/write???OffAddr
57 peekElemOff :: Ptr a -> Int -> IO a
58 pokeElemOff :: Ptr a -> Int -> a -> IO ()
60 -- the same with *byte* offsets
61 peekByteOff :: Ptr b -> Int -> IO a
62 pokeByteOff :: Ptr b -> Int -> a -> IO ()
64 -- ... and with no offsets at all
66 poke :: Ptr a -> a -> IO ()
68 -- free memory associated with the object
69 -- (except the object pointer itself)
70 destruct :: Ptr a -> IO ()
72 -- circular default instances
73 peekElemOff = peekElemOff_ undefined
74 where peekElemOff_ :: a -> Ptr a -> Int -> IO a
75 peekElemOff_ undef ptr off = peekByteOff ptr (off * sizeOf undef)
76 pokeElemOff ptr off val = pokeByteOff ptr (off * sizeOf val) val
78 peekByteOff ptr off = peek (ptr `plusPtr` off)
79 pokeByteOff ptr off = poke (ptr `plusPtr` off)
81 peek ptr = peekElemOff ptr 0
82 poke ptr = pokeElemOff ptr 0
84 destruct _ = return ()
87 System-dependent, but rather obvious instances
90 instance Storable Bool where
91 sizeOf _ = sizeOf (undefined::CInt)
92 alignment _ = alignment (undefined::CInt)
93 peekElemOff p i = liftM (/= (0::CInt)) $ peekElemOff (castPtr p) i
94 pokeElemOff p i x = pokeElemOff (castPtr p) i (if x then 1 else 0::CInt)
96 #define STORABLE(T,size,align,read,write) \
97 instance Storable (T) where { \
99 alignment _ = align; \
100 peekElemOff = read; \
101 pokeElemOff = write }
103 STORABLE(Char,SIZEOF_INT32,ALIGNMENT_INT32,
104 readWideCharOffPtr,writeWideCharOffPtr)
106 STORABLE(Int,SIZEOF_LONG,ALIGNMENT_LONG,
107 readIntOffPtr,writeIntOffPtr)
109 STORABLE(Word,SIZEOF_LONG,ALIGNMENT_LONG,
110 readWordOffPtr,writeWordOffPtr)
112 STORABLE((Ptr a),SIZEOF_VOID_P,ALIGNMENT_VOID_P,
113 readPtrOffPtr,writePtrOffPtr)
115 STORABLE((FunPtr a),SIZEOF_VOID_P,ALIGNMENT_VOID_P,
116 readFunPtrOffPtr,writeFunPtrOffPtr)
118 STORABLE((StablePtr a),SIZEOF_VOID_P,ALIGNMENT_VOID_P,
119 readStablePtrOffPtr,writeStablePtrOffPtr)
121 STORABLE(Float,SIZEOF_FLOAT,ALIGNMENT_FLOAT,
122 readFloatOffPtr,writeFloatOffPtr)
124 STORABLE(Double,SIZEOF_DOUBLE,ALIGNMENT_DOUBLE,
125 readDoubleOffPtr,writeDoubleOffPtr)
127 STORABLE(Word8,SIZEOF_WORD8,ALIGNMENT_WORD8,
128 readWord8OffPtr,writeWord8OffPtr)
130 STORABLE(Word16,SIZEOF_WORD16,ALIGNMENT_WORD16,
131 readWord16OffPtr,writeWord16OffPtr)
133 STORABLE(Word32,SIZEOF_WORD32,ALIGNMENT_WORD32,
134 readWord32OffPtr,writeWord32OffPtr)
136 STORABLE(Word64,SIZEOF_WORD64,ALIGNMENT_WORD64,
137 readWord64OffPtr,writeWord64OffPtr)
139 STORABLE(Int8,SIZEOF_INT8,ALIGNMENT_INT8,
140 readInt8OffPtr,writeInt8OffPtr)
142 STORABLE(Int16,SIZEOF_INT16,ALIGNMENT_INT16,
143 readInt16OffPtr,writeInt16OffPtr)
145 STORABLE(Int32,SIZEOF_INT32,ALIGNMENT_INT32,
146 readInt32OffPtr,writeInt32OffPtr)
148 STORABLE(Int64,SIZEOF_INT64,ALIGNMENT_INT64,
149 readInt64OffPtr,writeInt64OffPtr)
151 #define NSTORABLE(T) \
152 instance Storable T where { \
153 sizeOf (T x) = sizeOf x ; \
154 alignment (T x) = alignment x ; \
155 peekElemOff a i = liftM T (peekElemOff (castPtr a) i) ; \
156 pokeElemOff a i (T x) = pokeElemOff (castPtr a) i x }
175 NSTORABLE(CSigAtomic)
183 #ifdef __GLASGOW_HASKELL__
185 readWideCharOffPtr :: Ptr Char -> Int -> IO Char
186 readIntOffPtr :: Ptr Int -> Int -> IO Int
187 readWordOffPtr :: Ptr Word -> Int -> IO Word
188 readPtrOffPtr :: Ptr (Ptr a) -> Int -> IO (Ptr a)
189 readFunPtrOffPtr :: Ptr (FunPtr a) -> Int -> IO (FunPtr a)
190 readFloatOffPtr :: Ptr Float -> Int -> IO Float
191 readDoubleOffPtr :: Ptr Double -> Int -> IO Double
192 readStablePtrOffPtr :: Ptr (StablePtr a) -> Int -> IO (StablePtr a)
193 readInt8OffPtr :: Ptr Int8 -> Int -> IO Int8
194 readInt16OffPtr :: Ptr Int16 -> Int -> IO Int16
195 readInt32OffPtr :: Ptr Int32 -> Int -> IO Int32
196 readInt64OffPtr :: Ptr Int64 -> Int -> IO Int64
197 readWord8OffPtr :: Ptr Word8 -> Int -> IO Word8
198 readWord16OffPtr :: Ptr Word16 -> Int -> IO Word16
199 readWord32OffPtr :: Ptr Word32 -> Int -> IO Word32
200 readWord64OffPtr :: Ptr Word64 -> Int -> IO Word64
202 readWideCharOffPtr (Ptr a) (I# i)
203 = IO $ \s -> case readWideCharOffAddr# a i s of (# s2, x #) -> (# s2, C# x #)
204 readIntOffPtr (Ptr a) (I# i)
205 = IO $ \s -> case readIntOffAddr# a i s of (# s2, x #) -> (# s2, I# x #)
206 readWordOffPtr (Ptr a) (I# i)
207 = IO $ \s -> case readWordOffAddr# a i s of (# s2, x #) -> (# s2, W# x #)
208 readPtrOffPtr (Ptr a) (I# i)
209 = IO $ \s -> case readAddrOffAddr# a i s of (# s2, x #) -> (# s2, Ptr x #)
210 readFunPtrOffPtr (Ptr a) (I# i)
211 = IO $ \s -> case readAddrOffAddr# a i s of (# s2, x #) -> (# s2, FunPtr x #)
212 readFloatOffPtr (Ptr a) (I# i)
213 = IO $ \s -> case readFloatOffAddr# a i s of (# s2, x #) -> (# s2, F# x #)
214 readDoubleOffPtr (Ptr a) (I# i)
215 = IO $ \s -> case readDoubleOffAddr# a i s of (# s2, x #) -> (# s2, D# x #)
216 readStablePtrOffPtr (Ptr a) (I# i)
217 = IO $ \s -> case readStablePtrOffAddr# a i s of (# s2, x #) -> (# s2, StablePtr x #)
218 readInt8OffPtr (Ptr a) (I# i)
219 = IO $ \s -> case readInt8OffAddr# a i s of (# s2, x #) -> (# s2, I8# x #)
220 readInt16OffPtr (Ptr a) (I# i)
221 = IO $ \s -> case readInt16OffAddr# a i s of (# s2, x #) -> (# s2, I16# x #)
222 readInt32OffPtr (Ptr a) (I# i)
223 = IO $ \s -> case readInt32OffAddr# a i s of (# s2, x #) -> (# s2, I32# x #)
224 readInt64OffPtr (Ptr a) (I# i)
225 = IO $ \s -> case readInt64OffAddr# a i s of (# s2, x #) -> (# s2, I64# x #)
226 readWord8OffPtr (Ptr a) (I# i)
227 = IO $ \s -> case readWord8OffAddr# a i s of (# s2, x #) -> (# s2, W8# x #)
228 readWord16OffPtr (Ptr a) (I# i)
229 = IO $ \s -> case readWord16OffAddr# a i s of (# s2, x #) -> (# s2, W16# x #)
230 readWord32OffPtr (Ptr a) (I# i)
231 = IO $ \s -> case readWord32OffAddr# a i s of (# s2, x #) -> (# s2, W32# x #)
232 readWord64OffPtr (Ptr a) (I# i)
233 = IO $ \s -> case readWord64OffAddr# a i s of (# s2, x #) -> (# s2, W64# x #)
235 writeWideCharOffPtr :: Ptr Char -> Int -> Char -> IO ()
236 writeIntOffPtr :: Ptr Int -> Int -> Int -> IO ()
237 writeWordOffPtr :: Ptr Word -> Int -> Word -> IO ()
238 writePtrOffPtr :: Ptr (Ptr a) -> Int -> Ptr a -> IO ()
239 writeFunPtrOffPtr :: Ptr (FunPtr a) -> Int -> FunPtr a -> IO ()
240 writeFloatOffPtr :: Ptr Float -> Int -> Float -> IO ()
241 writeDoubleOffPtr :: Ptr Double -> Int -> Double -> IO ()
242 writeStablePtrOffPtr :: Ptr (StablePtr a) -> Int -> StablePtr a -> IO ()
243 writeInt8OffPtr :: Ptr Int8 -> Int -> Int8 -> IO ()
244 writeInt16OffPtr :: Ptr Int16 -> Int -> Int16 -> IO ()
245 writeInt32OffPtr :: Ptr Int32 -> Int -> Int32 -> IO ()
246 writeInt64OffPtr :: Ptr Int64 -> Int -> Int64 -> IO ()
247 writeWord8OffPtr :: Ptr Word8 -> Int -> Word8 -> IO ()
248 writeWord16OffPtr :: Ptr Word16 -> Int -> Word16 -> IO ()
249 writeWord32OffPtr :: Ptr Word32 -> Int -> Word32 -> IO ()
250 writeWord64OffPtr :: Ptr Word64 -> Int -> Word64 -> IO ()
252 writeWideCharOffPtr (Ptr a) (I# i) (C# x)
253 = IO $ \s -> case writeWideCharOffAddr# a i x s of s2 -> (# s2, () #)
254 writeIntOffPtr (Ptr a) (I# i) (I# x)
255 = IO $ \s -> case writeIntOffAddr# a i x s of s2 -> (# s2, () #)
256 writeWordOffPtr (Ptr a) (I# i) (W# x)
257 = IO $ \s -> case writeWordOffAddr# a i x s of s2 -> (# s2, () #)
258 writePtrOffPtr (Ptr a) (I# i) (Ptr x)
259 = IO $ \s -> case writeAddrOffAddr# a i x s of s2 -> (# s2, () #)
260 writeFunPtrOffPtr (Ptr a) (I# i) (FunPtr x)
261 = IO $ \s -> case writeAddrOffAddr# a i x s of s2 -> (# s2, () #)
262 writeFloatOffPtr (Ptr a) (I# i) (F# x)
263 = IO $ \s -> case writeFloatOffAddr# a i x s of s2 -> (# s2, () #)
264 writeDoubleOffPtr (Ptr a) (I# i) (D# x)
265 = IO $ \s -> case writeDoubleOffAddr# a i x s of s2 -> (# s2, () #)
266 writeStablePtrOffPtr (Ptr a) (I# i) (StablePtr x)
267 = IO $ \s -> case writeStablePtrOffAddr# a i x s of s2 -> (# s2 , () #)
268 writeInt8OffPtr (Ptr a) (I# i) (I8# x)
269 = IO $ \s -> case writeInt8OffAddr# a i x s of s2 -> (# s2, () #)
270 writeInt16OffPtr (Ptr a) (I# i) (I16# x)
271 = IO $ \s -> case writeInt16OffAddr# a i x s of s2 -> (# s2, () #)
272 writeInt32OffPtr (Ptr a) (I# i) (I32# x)
273 = IO $ \s -> case writeInt32OffAddr# a i x s of s2 -> (# s2, () #)
274 writeInt64OffPtr (Ptr a) (I# i) (I64# x)
275 = IO $ \s -> case writeInt64OffAddr# a i x s of s2 -> (# s2, () #)
276 writeWord8OffPtr (Ptr a) (I# i) (W8# x)
277 = IO $ \s -> case writeWord8OffAddr# a i x s of s2 -> (# s2, () #)
278 writeWord16OffPtr (Ptr a) (I# i) (W16# x)
279 = IO $ \s -> case writeWord16OffAddr# a i x s of s2 -> (# s2, () #)
280 writeWord32OffPtr (Ptr a) (I# i) (W32# x)
281 = IO $ \s -> case writeWord32OffAddr# a i x s of s2 -> (# s2, () #)
282 writeWord64OffPtr (Ptr a) (I# i) (W64# x)
283 = IO $ \s -> case writeWord64OffAddr# a i x s of s2 -> (# s2, () #)
285 #endif /* __GLASGOW_HASKELL__ */