1 % -----------------------------------------------------------------------------
2 % $Id: PrelStorable.lhs,v 1.3 2001/02/28 00:01:03 qrczak 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 ()
26 import Char ( chr, ord )
27 import Monad ( liftM )
29 #ifdef __GLASGOW_HASKELL__
30 import PrelStable ( StablePtr )
45 Minimal complete definition: sizeOf, alignment, and one definition
46 in each of the peek/poke families.
49 class Storable a where
51 -- sizeOf/alignment *never* use their first argument
55 -- replacement for read-/write???OffAddr
56 peekElemOff :: Ptr a -> Int -> IO a
57 pokeElemOff :: Ptr a -> Int -> a -> IO ()
59 -- the same with *byte* offsets
60 peekByteOff :: Ptr b -> Int -> IO a
61 pokeByteOff :: Ptr b -> Int -> a -> IO ()
63 -- ... and with no offsets at all
65 poke :: Ptr a -> a -> IO ()
67 -- circular default instances
68 peekElemOff = peekElemOff_ undefined
69 where peekElemOff_ :: a -> Ptr a -> Int -> IO a
70 peekElemOff_ undef ptr off = peekByteOff ptr (off * sizeOf undef)
71 pokeElemOff ptr off val = pokeByteOff ptr (off * sizeOf val) val
73 peekByteOff ptr off = peek (ptr `plusPtr` off)
74 pokeByteOff ptr off = poke (ptr `plusPtr` off)
76 peek ptr = peekElemOff ptr 0
77 poke ptr = pokeElemOff ptr 0
80 System-dependent, but rather obvious instances
83 instance Storable Bool where
84 sizeOf _ = sizeOf (undefined::CInt)
85 alignment _ = alignment (undefined::CInt)
86 peekElemOff p i = liftM (/= (0::CInt)) $ peekElemOff (castPtr p) i
87 pokeElemOff p i x = pokeElemOff (castPtr p) i (if x then 1 else 0::CInt)
89 instance Storable (FunPtr a) where
90 sizeOf (FunPtr x) = sizeOf x
91 alignment (FunPtr x) = alignment x
92 peekElemOff p i = liftM FunPtr $ peekElemOff (castPtr p) i
93 pokeElemOff p i (FunPtr x) = pokeElemOff (castPtr p) i x
95 #define STORABLE(T,size,align,read,write) \
96 instance Storable (T) where { \
98 alignment _ = align; \
100 pokeElemOff = write }
102 STORABLE(Char,SIZEOF_INT32,ALIGNMENT_INT32,
103 readWideCharOffPtr,writeWideCharOffPtr)
105 STORABLE(Int,SIZEOF_LONG,ALIGNMENT_LONG,
106 readIntOffPtr,writeIntOffPtr)
108 STORABLE(Word,SIZEOF_LONG,ALIGNMENT_LONG,
109 readWordOffPtr,writeWordOffPtr)
111 STORABLE((Ptr a),SIZEOF_VOID_P,ALIGNMENT_VOID_P,
112 readPtrOffPtr,writePtrOffPtr)
114 STORABLE((StablePtr a),SIZEOF_VOID_P,ALIGNMENT_VOID_P,
115 readStablePtrOffPtr,writeStablePtrOffPtr)
117 STORABLE(Float,SIZEOF_FLOAT,ALIGNMENT_FLOAT,
118 readFloatOffPtr,writeFloatOffPtr)
120 STORABLE(Double,SIZEOF_DOUBLE,ALIGNMENT_DOUBLE,
121 readDoubleOffPtr,writeDoubleOffPtr)
123 STORABLE(Word8,SIZEOF_WORD8,ALIGNMENT_WORD8,
124 readWord8OffPtr,writeWord8OffPtr)
126 STORABLE(Word16,SIZEOF_WORD16,ALIGNMENT_WORD16,
127 readWord16OffPtr,writeWord16OffPtr)
129 STORABLE(Word32,SIZEOF_WORD32,ALIGNMENT_WORD32,
130 readWord32OffPtr,writeWord32OffPtr)
132 STORABLE(Word64,SIZEOF_WORD64,ALIGNMENT_WORD64,
133 readWord64OffPtr,writeWord64OffPtr)
135 STORABLE(Int8,SIZEOF_INT8,ALIGNMENT_INT8,
136 readInt8OffPtr,writeInt8OffPtr)
138 STORABLE(Int16,SIZEOF_INT16,ALIGNMENT_INT16,
139 readInt16OffPtr,writeInt16OffPtr)
141 STORABLE(Int32,SIZEOF_INT32,ALIGNMENT_INT32,
142 readInt32OffPtr,writeInt32OffPtr)
144 STORABLE(Int64,SIZEOF_INT64,ALIGNMENT_INT64,
145 readInt64OffPtr,writeInt64OffPtr)
147 #define NSTORABLE(T) \
148 instance Storable T where { \
149 sizeOf (T x) = sizeOf x ; \
150 alignment (T x) = alignment x ; \
151 peekElemOff a i = liftM T (peekElemOff (castPtr a) i) ; \
152 pokeElemOff a i (T x) = pokeElemOff (castPtr a) i x }
171 NSTORABLE(CSigAtomic)
179 #ifdef __GLASGOW_HASKELL__
181 readWideCharOffPtr :: Ptr Char -> Int -> IO Char
182 readIntOffPtr :: Ptr Int -> Int -> IO Int
183 readWordOffPtr :: Ptr Word -> Int -> IO Word
184 readPtrOffPtr :: Ptr (Ptr a) -> Int -> IO (Ptr a)
185 readFloatOffPtr :: Ptr Float -> Int -> IO Float
186 readDoubleOffPtr :: Ptr Double -> Int -> IO Double
187 readStablePtrOffPtr :: Ptr (StablePtr a) -> Int -> IO (StablePtr a)
188 readInt8OffPtr :: Ptr Int8 -> Int -> IO Int8
189 readInt16OffPtr :: Ptr Int16 -> Int -> IO Int16
190 readInt32OffPtr :: Ptr Int32 -> Int -> IO Int32
191 readInt64OffPtr :: Ptr Int64 -> Int -> IO Int64
192 readWord8OffPtr :: Ptr Word8 -> Int -> IO Word8
193 readWord16OffPtr :: Ptr Word16 -> Int -> IO Word16
194 readWord32OffPtr :: Ptr Word32 -> Int -> IO Word32
195 readWord64OffPtr :: Ptr Word64 -> Int -> IO Word64
197 readWideCharOffPtr (Ptr a) (I# i)
198 = IO $ \s -> case readWideCharOffAddr# a i s of (# s2, x #) -> (# s2, C# x #)
199 readIntOffPtr (Ptr a) (I# i)
200 = IO $ \s -> case readIntOffAddr# a i s of (# s2, x #) -> (# s2, I# x #)
201 readWordOffPtr (Ptr a) (I# i)
202 = IO $ \s -> case readWordOffAddr# a i s of (# s2, x #) -> (# s2, W# x #)
203 readPtrOffPtr (Ptr a) (I# i)
204 = IO $ \s -> case readAddrOffAddr# a i s of (# s2, x #) -> (# s2, Ptr x #)
205 readFloatOffPtr (Ptr a) (I# i)
206 = IO $ \s -> case readFloatOffAddr# a i s of (# s2, x #) -> (# s2, F# x #)
207 readDoubleOffPtr (Ptr a) (I# i)
208 = IO $ \s -> case readDoubleOffAddr# a i s of (# s2, x #) -> (# s2, D# x #)
209 readStablePtrOffPtr (Ptr a) (I# i)
210 = IO $ \s -> case readStablePtrOffAddr# a i s of (# s2, x #) -> (# s2, StablePtr x #)
211 readInt8OffPtr (Ptr a) (I# i)
212 = IO $ \s -> case readInt8OffAddr# a i s of (# s2, x #) -> (# s2, I8# x #)
213 readInt16OffPtr (Ptr a) (I# i)
214 = IO $ \s -> case readInt16OffAddr# a i s of (# s2, x #) -> (# s2, I16# x #)
215 readInt32OffPtr (Ptr a) (I# i)
216 = IO $ \s -> case readInt32OffAddr# a i s of (# s2, x #) -> (# s2, I32# x #)
217 readInt64OffPtr (Ptr a) (I# i)
218 = IO $ \s -> case readInt64OffAddr# a i s of (# s2, x #) -> (# s2, I64# x #)
219 readWord8OffPtr (Ptr a) (I# i)
220 = IO $ \s -> case readWord8OffAddr# a i s of (# s2, x #) -> (# s2, W8# x #)
221 readWord16OffPtr (Ptr a) (I# i)
222 = IO $ \s -> case readWord16OffAddr# a i s of (# s2, x #) -> (# s2, W16# x #)
223 readWord32OffPtr (Ptr a) (I# i)
224 = IO $ \s -> case readWord32OffAddr# a i s of (# s2, x #) -> (# s2, W32# x #)
225 readWord64OffPtr (Ptr a) (I# i)
226 = IO $ \s -> case readWord64OffAddr# a i s of (# s2, x #) -> (# s2, W64# x #)
228 writeWideCharOffPtr :: Ptr Char -> Int -> Char -> IO ()
229 writeIntOffPtr :: Ptr Int -> Int -> Int -> IO ()
230 writeWordOffPtr :: Ptr Word -> Int -> Word -> IO ()
231 writePtrOffPtr :: Ptr (Ptr a) -> Int -> Ptr a -> IO ()
232 writeFloatOffPtr :: Ptr Float -> Int -> Float -> IO ()
233 writeDoubleOffPtr :: Ptr Double -> Int -> Double -> IO ()
234 writeStablePtrOffPtr :: Ptr (StablePtr a) -> Int -> StablePtr a -> IO ()
235 writeInt8OffPtr :: Ptr Int8 -> Int -> Int8 -> IO ()
236 writeInt16OffPtr :: Ptr Int16 -> Int -> Int16 -> IO ()
237 writeInt32OffPtr :: Ptr Int32 -> Int -> Int32 -> IO ()
238 writeInt64OffPtr :: Ptr Int64 -> Int -> Int64 -> IO ()
239 writeWord8OffPtr :: Ptr Word8 -> Int -> Word8 -> IO ()
240 writeWord16OffPtr :: Ptr Word16 -> Int -> Word16 -> IO ()
241 writeWord32OffPtr :: Ptr Word32 -> Int -> Word32 -> IO ()
242 writeWord64OffPtr :: Ptr Word64 -> Int -> Word64 -> IO ()
244 writeWideCharOffPtr (Ptr a) (I# i) (C# x)
245 = IO $ \s -> case writeWideCharOffAddr# a i x s of s2 -> (# s2, () #)
246 writeIntOffPtr (Ptr a) (I# i) (I# x)
247 = IO $ \s -> case writeIntOffAddr# a i x s of s2 -> (# s2, () #)
248 writeWordOffPtr (Ptr a) (I# i) (W# x)
249 = IO $ \s -> case writeWordOffAddr# a i x s of s2 -> (# s2, () #)
250 writePtrOffPtr (Ptr a) (I# i) (Ptr x)
251 = IO $ \s -> case writeAddrOffAddr# a i x s of s2 -> (# s2, () #)
252 writeFloatOffPtr (Ptr a) (I# i) (F# x)
253 = IO $ \s -> case writeFloatOffAddr# a i x s of s2 -> (# s2, () #)
254 writeDoubleOffPtr (Ptr a) (I# i) (D# x)
255 = IO $ \s -> case writeDoubleOffAddr# a i x s of s2 -> (# s2, () #)
256 writeStablePtrOffPtr (Ptr a) (I# i) (StablePtr x)
257 = IO $ \s -> case writeStablePtrOffAddr# a i x s of s2 -> (# s2 , () #)
258 writeInt8OffPtr (Ptr a) (I# i) (I8# x)
259 = IO $ \s -> case writeInt8OffAddr# a i x s of s2 -> (# s2, () #)
260 writeInt16OffPtr (Ptr a) (I# i) (I16# x)
261 = IO $ \s -> case writeInt16OffAddr# a i x s of s2 -> (# s2, () #)
262 writeInt32OffPtr (Ptr a) (I# i) (I32# x)
263 = IO $ \s -> case writeInt32OffAddr# a i x s of s2 -> (# s2, () #)
264 writeInt64OffPtr (Ptr a) (I# i) (I64# x)
265 = IO $ \s -> case writeInt64OffAddr# a i x s of s2 -> (# s2, () #)
266 writeWord8OffPtr (Ptr a) (I# i) (W8# x)
267 = IO $ \s -> case writeWord8OffAddr# a i x s of s2 -> (# s2, () #)
268 writeWord16OffPtr (Ptr a) (I# i) (W16# x)
269 = IO $ \s -> case writeWord16OffAddr# a i x s of s2 -> (# s2, () #)
270 writeWord32OffPtr (Ptr a) (I# i) (W32# x)
271 = IO $ \s -> case writeWord32OffAddr# a i x s of s2 -> (# s2, () #)
272 writeWord64OffPtr (Ptr a) (I# i) (W64# x)
273 = IO $ \s -> case writeWord64OffAddr# a i x s of s2 -> (# s2, () #)
275 #endif /* __GLASGOW_HASKELL__ */