1 {-# OPTIONS -fno-implicit-prelude #-}
2 -----------------------------------------------------------------------------
4 -- Module : Foreign.C.Types
5 -- Copyright : (c) The FFI task force 2001
6 -- License : BSD-style (see the file libraries/base/LICENSE)
8 -- Maintainer : ffi@haskell.org
9 -- Stability : provisional
10 -- Portability : portable
12 -- Mapping of C types to corresponding Haskell types.
14 -----------------------------------------------------------------------------
16 module Foreign.C.Types
17 ( -- * Representations of C types
22 -- | These types are are represented as @newtype@s of types in
23 -- "Data.Int" and "Data.Word", and are instances of
24 -- 'Eq', 'Ord', 'Num', 'Read', 'Show', 'Enum', 'Typeable',
25 -- 'Storable', 'Bounded', 'Real', 'Integral' and 'Bits'.
27 , CShort, CUShort, CInt, CUInt
29 , CPtrdiff, CSize, CWchar, CSigAtomic
33 -- | These types are are represented as @newtype@s of basic
34 -- foreign types, and are instances of
35 -- 'Eq', 'Ord', 'Num', 'Read', 'Show', 'Enum', 'Typeable' and
40 -- | These types are are represented as @newtype@s of 'Float'
41 -- and 'Double', and are instances of
42 -- 'Eq', 'Ord', 'Num', 'Read', 'Show', 'Enum', 'Typeable',
43 -- 'Storable', 'Real', 'Fractional', 'Floating', 'RealFrac'
45 , CFloat, CDouble, CLDouble
47 -- Exported non-abstractly in nhc98 to fix an interface file problem.
48 CChar(..), CSChar(..), CUChar(..)
49 , CShort(..), CUShort(..), CInt(..), CUInt(..)
50 , CLong(..), CULong(..)
51 , CPtrdiff(..), CSize(..), CWchar(..), CSigAtomic(..)
52 , CLLong(..), CULLong(..)
53 , CClock(..), CTime(..)
54 , CFloat(..), CDouble(..), CLDouble(..)
58 -- Instances of: Eq and Storable
59 , CFile, CFpos, CJmpBuf
64 import Foreign.Storable
65 import Data.Bits ( Bits(..) )
66 import Data.Int ( Int8, Int16, Int32, Int64 )
67 import Data.Word ( Word8, Word16, Word32, Word64 )
70 #ifdef __GLASGOW_HASKELL__
86 -- | Haskell type representing the C @char@ type.
87 INTEGRAL_TYPE(CChar,tyConCChar,"CChar",HTYPE_CHAR)
88 -- | Haskell type representing the C @signed char@ type.
89 INTEGRAL_TYPE(CSChar,tyConCSChar,"CSChar",HTYPE_SIGNED_CHAR)
90 -- | Haskell type representing the C @unsigned char@ type.
91 INTEGRAL_TYPE(CUChar,tyConCUChar,"CUChar",HTYPE_UNSIGNED_CHAR)
93 -- | Haskell type representing the C @short@ type.
94 INTEGRAL_TYPE(CShort,tyConCShort,"CShort",HTYPE_SHORT)
95 -- | Haskell type representing the C @unsigned short@ type.
96 INTEGRAL_TYPE(CUShort,tyConCUShort,"CUShort",HTYPE_UNSIGNED_SHORT)
98 -- | Haskell type representing the C @int@ type.
99 INTEGRAL_TYPE(CInt,tyConCInt,"CInt",HTYPE_INT)
100 -- | Haskell type representing the C @unsigned int@ type.
101 INTEGRAL_TYPE(CUInt,tyConCUInt,"CUInt",HTYPE_UNSIGNED_INT)
103 -- | Haskell type representing the C @long@ type.
104 INTEGRAL_TYPE(CLong,tyConCLong,"CLong",HTYPE_LONG)
105 -- | Haskell type representing the C @unsigned long@ type.
106 INTEGRAL_TYPE(CULong,tyConCULong,"CULong",HTYPE_UNSIGNED_LONG)
108 -- | Haskell type representing the C @long long@ type.
109 INTEGRAL_TYPE(CLLong,tyConCLLong,"CLLong",HTYPE_LONG_LONG)
110 -- | Haskell type representing the C @unsigned long long@ type.
111 INTEGRAL_TYPE(CULLong,tyConCULLong,"CULLong",HTYPE_UNSIGNED_LONG_LONG)
114 "fromIntegral/a->CChar" fromIntegral = \x -> CChar (fromIntegral x)
115 "fromIntegral/a->CSChar" fromIntegral = \x -> CSChar (fromIntegral x)
116 "fromIntegral/a->CUChar" fromIntegral = \x -> CUChar (fromIntegral x)
117 "fromIntegral/a->CShort" fromIntegral = \x -> CShort (fromIntegral x)
118 "fromIntegral/a->CUShort" fromIntegral = \x -> CUShort (fromIntegral x)
119 "fromIntegral/a->CInt" fromIntegral = \x -> CInt (fromIntegral x)
120 "fromIntegral/a->CUInt" fromIntegral = \x -> CUInt (fromIntegral x)
121 "fromIntegral/a->CLong" fromIntegral = \x -> CLong (fromIntegral x)
122 "fromIntegral/a->CULong" fromIntegral = \x -> CULong (fromIntegral x)
123 "fromIntegral/a->CLLong" fromIntegral = \x -> CLLong (fromIntegral x)
124 "fromIntegral/a->CULLong" fromIntegral = \x -> CULLong (fromIntegral x)
126 "fromIntegral/CChar->a" fromIntegral = \(CChar x) -> fromIntegral x
127 "fromIntegral/CSChar->a" fromIntegral = \(CSChar x) -> fromIntegral x
128 "fromIntegral/CUChar->a" fromIntegral = \(CUChar x) -> fromIntegral x
129 "fromIntegral/CShort->a" fromIntegral = \(CShort x) -> fromIntegral x
130 "fromIntegral/CUShort->a" fromIntegral = \(CUShort x) -> fromIntegral x
131 "fromIntegral/CInt->a" fromIntegral = \(CInt x) -> fromIntegral x
132 "fromIntegral/CUInt->a" fromIntegral = \(CUInt x) -> fromIntegral x
133 "fromIntegral/CLong->a" fromIntegral = \(CLong x) -> fromIntegral x
134 "fromIntegral/CULong->a" fromIntegral = \(CULong x) -> fromIntegral x
135 "fromIntegral/CLLong->a" fromIntegral = \(CLLong x) -> fromIntegral x
136 "fromIntegral/CULLong->a" fromIntegral = \(CULLong x) -> fromIntegral x
139 -- | Haskell type representing the C @float@ type.
140 FLOATING_TYPE(CFloat,tyConCFloat,"CFloat",HTYPE_FLOAT)
141 -- | Haskell type representing the C @double@ type.
142 FLOATING_TYPE(CDouble,tyConCDouble,"CDouble",HTYPE_DOUBLE)
143 -- HACK: Currently no long double in the FFI, so we simply re-use double
144 -- | Haskell type representing the C @long double@ type.
145 FLOATING_TYPE(CLDouble,tyConCLDouble,"CLDouble",HTYPE_DOUBLE)
148 "realToFrac/a->CFloat" realToFrac = \x -> CFloat (realToFrac x)
149 "realToFrac/a->CDouble" realToFrac = \x -> CDouble (realToFrac x)
150 "realToFrac/a->CLDouble" realToFrac = \x -> CLDouble (realToFrac x)
152 "realToFrac/CFloat->a" realToFrac = \(CFloat x) -> realToFrac x
153 "realToFrac/CDouble->a" realToFrac = \(CDouble x) -> realToFrac x
154 "realToFrac/CLDouble->a" realToFrac = \(CLDouble x) -> realToFrac x
157 -- | Haskell type representing the C @ptrdiff_t@ type.
158 INTEGRAL_TYPE(CPtrdiff,tyConCPtrdiff,"CPtrdiff",HTYPE_PTRDIFF_T)
159 -- | Haskell type representing the C @size_t@ type.
160 INTEGRAL_TYPE(CSize,tyConCSize,"CSize",HTYPE_SIZE_T)
161 -- | Haskell type representing the C @wchar_t@ type.
162 INTEGRAL_TYPE(CWchar,tyConCWchar,"CWchar",HTYPE_WCHAR_T)
163 -- | Haskell type representing the C @sig_atomic_t@ type.
164 INTEGRAL_TYPE(CSigAtomic,tyConCSigAtomic,"CSigAtomic",HTYPE_SIG_ATOMIC_T)
167 "fromIntegral/a->CPtrdiff" fromIntegral = \x -> CPtrdiff (fromIntegral x)
168 "fromIntegral/a->CSize" fromIntegral = \x -> CSize (fromIntegral x)
169 "fromIntegral/a->CWchar" fromIntegral = \x -> CWchar (fromIntegral x)
170 "fromIntegral/a->CSigAtomic" fromIntegral = \x -> CSigAtomic (fromIntegral x)
172 "fromIntegral/CPtrdiff->a" fromIntegral = \(CPtrdiff x) -> fromIntegral x
173 "fromIntegral/CSize->a" fromIntegral = \(CSize x) -> fromIntegral x
174 "fromIntegral/CWchar->a" fromIntegral = \(CWchar x) -> fromIntegral x
175 "fromIntegral/CSigAtomic->a" fromIntegral = \(CSigAtomic x) -> fromIntegral x
178 -- | Haskell type representing the C @clock_t@ type.
179 ARITHMETIC_TYPE(CClock,tyConCClock,"CClock",HTYPE_CLOCK_T)
180 -- | Haskell type representing the C @time_t@ type.
181 ARITHMETIC_TYPE(CTime,tyConCTime,"CTime",HTYPE_TIME_T)
183 -- FIXME: Implement and provide instances for Eq and Storable
184 -- | Haskell type representing the C @FILE@ type.
186 -- | Haskell type representing the C @fpos_t@ type.
188 -- | Haskell type representing the C @jmp_buf@ type.
189 data CJmpBuf = CJmpBuf
191 -- C99 types which are still missing include:
192 -- intptr_t, uintptr_t, intmax_t, uintmax_t, wint_t, wctrans_t, wctype_t
196 These types are needed to accurately represent C function prototypes,
197 in order to access C library interfaces in Haskell. The Haskell system
198 is not required to represent those types exactly as C does, but the
199 following guarantees are provided concerning a Haskell type @CT@
200 representing a C type @t@:
202 * If a C function prototype has @t@ as an argument or result type,
203 the use of @CT@ in the corresponding position in a foreign declaration
204 permits the Haskell program to access the full range of values encoded by
205 the C type; and conversely, any Haskell value for @CT@ has a valid
208 * @'sizeOf' ('undefined' :: CT)@ will yield the same value as
211 * @'alignment' ('undefined' :: CT)@ matches the alignment constraint
212 enforced by the C implementation for @t@.
214 * The members 'peek' and 'poke' of the 'Storable' class map all values of
215 @CT@ to the corresponding value of @t@ and vice versa.
217 * When an instance of 'Bounded' is defined for @CT@, the values of
218 'minBound' and 'maxBound' coincide with @t_MIN@ and @t_MAX@ in C.
220 * When an instance of 'Eq' or 'Ord' is defined for @CT@, the predicates
221 defined by the type class implement the same relation as the
222 corresponding predicate in C on @t@.
224 * When an instance of 'Num', 'Read', 'Integral', 'Fractional', 'Floating',
225 'RealFrac', or 'RealFloat' is defined for @CT@, the arithmetic
226 operations defined by the type class implement the same function as
227 the corresponding arithmetic operations (if available) in C on @t@.
229 * When an instance of 'Bits' is defined for @CT@, the bitwise operation
230 defined by the type class implement the same function as the
231 corresponding bitwise operation in C on @t@.
238 ( CChar(..), CSChar(..), CUChar(..)
239 , CShort(..), CUShort(..), CInt(..), CUInt(..)
240 , CLong(..), CULong(..), CLLong(..), CULLong(..)
241 , CPtrdiff(..), CSize(..), CWchar(..), CSigAtomic(..)
242 , CClock(..), CTime(..)
243 , CFloat(..), CDouble(..), CLDouble(..)
244 , CFile, CFpos, CJmpBuf
248 import NHC.SizedTypes
250 #define INSTANCE_BITS(T) \
251 instance Bits T where { \
252 (T x) .&. (T y) = T (x .&. y) ; \
253 (T x) .|. (T y) = T (x .|. y) ; \
254 (T x) `xor` (T y) = T (x `xor` y) ; \
255 complement (T x) = T (complement x) ; \
256 shift (T x) n = T (shift x n) ; \
257 rotate (T x) n = T (rotate x n) ; \
258 bit n = T (bit n) ; \
259 setBit (T x) n = T (setBit x n) ; \
260 clearBit (T x) n = T (clearBit x n) ; \
261 complementBit (T x) n = T (complementBit x n) ; \
262 testBit (T x) n = testBit x n ; \
263 bitSize (T x) = bitSize x ; \
264 isSigned (T x) = isSigned x }
267 INSTANCE_BITS(CSChar)
268 INSTANCE_BITS(CUChar)
269 INSTANCE_BITS(CShort)
270 INSTANCE_BITS(CUShort)
274 INSTANCE_BITS(CULong)
275 INSTANCE_BITS(CLLong)
276 INSTANCE_BITS(CULLong)
277 INSTANCE_BITS(CPtrdiff)
278 INSTANCE_BITS(CWchar)
279 INSTANCE_BITS(CSigAtomic)