1 {-# OPTIONS_GHC -XNoImplicitPrelude #-}
2 {-# OPTIONS_GHC -fno-warn-unused-binds #-}
3 -- XXX -fno-warn-unused-binds stops us warning about unused constructors,
4 -- but really we should just remove them if we don't want them
5 -----------------------------------------------------------------------------
7 -- Module : Foreign.C.Types
8 -- Copyright : (c) The FFI task force 2001
9 -- License : BSD-style (see the file libraries/base/LICENSE)
11 -- Maintainer : ffi@haskell.org
12 -- Stability : provisional
13 -- Portability : portable
15 -- Mapping of C types to corresponding Haskell types.
17 -----------------------------------------------------------------------------
19 module Foreign.C.Types
20 ( -- * Representations of C types
25 -- | These types are are represented as @newtype@s of
26 -- types in "Data.Int" and "Data.Word", and are instances of
27 -- 'Prelude.Eq', 'Prelude.Ord', 'Prelude.Num', 'Prelude.Read',
28 -- 'Prelude.Show', 'Prelude.Enum', 'Typeable', 'Storable',
29 -- 'Prelude.Bounded', 'Prelude.Real', 'Prelude.Integral' and
32 , CShort, CUShort, CInt, CUInt
34 , CPtrdiff, CSize, CWchar, CSigAtomic
40 -- | These types are are represented as @newtype@s of basic
41 -- foreign types, and are instances of
42 -- 'Prelude.Eq', 'Prelude.Ord', 'Prelude.Num', 'Prelude.Read',
43 -- 'Prelude.Show', 'Prelude.Enum', 'Typeable' and 'Storable'.
46 -- extracted from CTime, because we don't want this comment in
47 -- the Haskell 2010 report:
49 -- | To convert 'CTime' to 'Data.Time.UTCTime', use the following formula:
51 -- > posixSecondsToUTCTime (realToFrac :: POSIXTime)
55 -- | These types are are represented as @newtype@s of
56 -- 'Prelude.Float' and 'Prelude.Double', and are instances of
57 -- 'Prelude.Eq', 'Prelude.Ord', 'Prelude.Num', 'Prelude.Read',
58 -- 'Prelude.Show', 'Prelude.Enum', 'Typeable', 'Storable',
59 -- 'Prelude.Real', 'Prelude.Fractional', 'Prelude.Floating',
60 -- 'Prelude.RealFrac' and 'Prelude.RealFloat'.
62 -- GHC doesn't support CLDouble yet
63 #ifndef __GLASGOW_HASKELL__
67 -- Exported non-abstractly in nhc98 to fix an interface file problem.
68 CChar(..), CSChar(..), CUChar(..)
69 , CShort(..), CUShort(..), CInt(..), CUInt(..)
70 , CLong(..), CULong(..)
71 , CPtrdiff(..), CSize(..), CWchar(..), CSigAtomic(..)
72 , CLLong(..), CULLong(..)
73 , CClock(..), CTime(..)
74 , CFloat(..), CDouble(..), CLDouble(..)
78 -- Instances of: Eq and Storable
79 , CFile, CFpos, CJmpBuf
84 import Foreign.Storable
85 import Data.Bits ( Bits(..) )
86 import Data.Int ( Int8, Int16, Int32, Int64 )
87 import Data.Word ( Word8, Word16, Word32, Word64 )
88 import {-# SOURCE #-} Data.Typeable (Typeable(typeOf), TyCon, mkTyCon, mkTyConApp)
90 #ifdef __GLASGOW_HASKELL__
99 import Control.Monad ( liftM )
103 import Hugs.Ptr ( castPtr )
106 #include "HsBaseConfig.h"
109 -- | Haskell type representing the C @char@ type.
110 INTEGRAL_TYPE(CChar,tyConCChar,"CChar",HTYPE_CHAR)
111 -- | Haskell type representing the C @signed char@ type.
112 INTEGRAL_TYPE(CSChar,tyConCSChar,"CSChar",HTYPE_SIGNED_CHAR)
113 -- | Haskell type representing the C @unsigned char@ type.
114 INTEGRAL_TYPE(CUChar,tyConCUChar,"CUChar",HTYPE_UNSIGNED_CHAR)
116 -- | Haskell type representing the C @short@ type.
117 INTEGRAL_TYPE(CShort,tyConCShort,"CShort",HTYPE_SHORT)
118 -- | Haskell type representing the C @unsigned short@ type.
119 INTEGRAL_TYPE(CUShort,tyConCUShort,"CUShort",HTYPE_UNSIGNED_SHORT)
121 -- | Haskell type representing the C @int@ type.
122 INTEGRAL_TYPE(CInt,tyConCInt,"CInt",HTYPE_INT)
123 -- | Haskell type representing the C @unsigned int@ type.
124 INTEGRAL_TYPE(CUInt,tyConCUInt,"CUInt",HTYPE_UNSIGNED_INT)
126 -- | Haskell type representing the C @long@ type.
127 INTEGRAL_TYPE(CLong,tyConCLong,"CLong",HTYPE_LONG)
128 -- | Haskell type representing the C @unsigned long@ type.
129 INTEGRAL_TYPE(CULong,tyConCULong,"CULong",HTYPE_UNSIGNED_LONG)
131 -- | Haskell type representing the C @long long@ type.
132 INTEGRAL_TYPE(CLLong,tyConCLLong,"CLLong",HTYPE_LONG_LONG)
133 -- | Haskell type representing the C @unsigned long long@ type.
134 INTEGRAL_TYPE(CULLong,tyConCULLong,"CULLong",HTYPE_UNSIGNED_LONG_LONG)
137 "fromIntegral/a->CChar" fromIntegral = \x -> CChar (fromIntegral x)
138 "fromIntegral/a->CSChar" fromIntegral = \x -> CSChar (fromIntegral x)
139 "fromIntegral/a->CUChar" fromIntegral = \x -> CUChar (fromIntegral x)
140 "fromIntegral/a->CShort" fromIntegral = \x -> CShort (fromIntegral x)
141 "fromIntegral/a->CUShort" fromIntegral = \x -> CUShort (fromIntegral x)
142 "fromIntegral/a->CInt" fromIntegral = \x -> CInt (fromIntegral x)
143 "fromIntegral/a->CUInt" fromIntegral = \x -> CUInt (fromIntegral x)
144 "fromIntegral/a->CLong" fromIntegral = \x -> CLong (fromIntegral x)
145 "fromIntegral/a->CULong" fromIntegral = \x -> CULong (fromIntegral x)
146 "fromIntegral/a->CLLong" fromIntegral = \x -> CLLong (fromIntegral x)
147 "fromIntegral/a->CULLong" fromIntegral = \x -> CULLong (fromIntegral x)
149 "fromIntegral/CChar->a" fromIntegral = \(CChar x) -> fromIntegral x
150 "fromIntegral/CSChar->a" fromIntegral = \(CSChar x) -> fromIntegral x
151 "fromIntegral/CUChar->a" fromIntegral = \(CUChar x) -> fromIntegral x
152 "fromIntegral/CShort->a" fromIntegral = \(CShort x) -> fromIntegral x
153 "fromIntegral/CUShort->a" fromIntegral = \(CUShort x) -> fromIntegral x
154 "fromIntegral/CInt->a" fromIntegral = \(CInt x) -> fromIntegral x
155 "fromIntegral/CUInt->a" fromIntegral = \(CUInt x) -> fromIntegral x
156 "fromIntegral/CLong->a" fromIntegral = \(CLong x) -> fromIntegral x
157 "fromIntegral/CULong->a" fromIntegral = \(CULong x) -> fromIntegral x
158 "fromIntegral/CLLong->a" fromIntegral = \(CLLong x) -> fromIntegral x
159 "fromIntegral/CULLong->a" fromIntegral = \(CULLong x) -> fromIntegral x
162 -- | Haskell type representing the C @float@ type.
163 FLOATING_TYPE(CFloat,tyConCFloat,"CFloat",HTYPE_FLOAT)
164 -- | Haskell type representing the C @double@ type.
165 FLOATING_TYPE(CDouble,tyConCDouble,"CDouble",HTYPE_DOUBLE)
166 -- GHC doesn't support CLDouble yet
167 #ifndef __GLASGOW_HASKELL__
168 -- HACK: Currently no long double in the FFI, so we simply re-use double
169 -- | Haskell type representing the C @long double@ type.
170 FLOATING_TYPE(CLDouble,tyConCLDouble,"CLDouble",HTYPE_DOUBLE)
174 "realToFrac/a->CFloat" realToFrac = \x -> CFloat (realToFrac x)
175 "realToFrac/a->CDouble" realToFrac = \x -> CDouble (realToFrac x)
177 "realToFrac/CFloat->a" realToFrac = \(CFloat x) -> realToFrac x
178 "realToFrac/CDouble->a" realToFrac = \(CDouble x) -> realToFrac x
181 -- GHC doesn't support CLDouble yet
182 -- "realToFrac/a->CLDouble" realToFrac = \x -> CLDouble (realToFrac x)
183 -- "realToFrac/CLDouble->a" realToFrac = \(CLDouble x) -> realToFrac x
185 -- | Haskell type representing the C @ptrdiff_t@ type.
186 INTEGRAL_TYPE(CPtrdiff,tyConCPtrdiff,"CPtrdiff",HTYPE_PTRDIFF_T)
187 -- | Haskell type representing the C @size_t@ type.
188 INTEGRAL_TYPE(CSize,tyConCSize,"CSize",HTYPE_SIZE_T)
189 -- | Haskell type representing the C @wchar_t@ type.
190 INTEGRAL_TYPE(CWchar,tyConCWchar,"CWchar",HTYPE_WCHAR_T)
191 -- | Haskell type representing the C @sig_atomic_t@ type.
192 INTEGRAL_TYPE(CSigAtomic,tyConCSigAtomic,"CSigAtomic",HTYPE_SIG_ATOMIC_T)
195 "fromIntegral/a->CPtrdiff" fromIntegral = \x -> CPtrdiff (fromIntegral x)
196 "fromIntegral/a->CSize" fromIntegral = \x -> CSize (fromIntegral x)
197 "fromIntegral/a->CWchar" fromIntegral = \x -> CWchar (fromIntegral x)
198 "fromIntegral/a->CSigAtomic" fromIntegral = \x -> CSigAtomic (fromIntegral x)
200 "fromIntegral/CPtrdiff->a" fromIntegral = \(CPtrdiff x) -> fromIntegral x
201 "fromIntegral/CSize->a" fromIntegral = \(CSize x) -> fromIntegral x
202 "fromIntegral/CWchar->a" fromIntegral = \(CWchar x) -> fromIntegral x
203 "fromIntegral/CSigAtomic->a" fromIntegral = \(CSigAtomic x) -> fromIntegral x
206 -- | Haskell type representing the C @clock_t@ type.
207 ARITHMETIC_TYPE(CClock,tyConCClock,"CClock",HTYPE_CLOCK_T)
208 -- | Haskell type representing the C @time_t@ type.
210 ARITHMETIC_TYPE(CTime,tyConCTime,"CTime",HTYPE_TIME_T)
212 -- FIXME: Implement and provide instances for Eq and Storable
213 -- | Haskell type representing the C @FILE@ type.
215 -- | Haskell type representing the C @fpos_t@ type.
217 -- | Haskell type representing the C @jmp_buf@ type.
218 data CJmpBuf = CJmpBuf
220 INTEGRAL_TYPE(CIntPtr,tyConCIntPtr,"CIntPtr",HTYPE_INTPTR_T)
221 INTEGRAL_TYPE(CUIntPtr,tyConCUIntPtr,"CUIntPtr",HTYPE_UINTPTR_T)
222 INTEGRAL_TYPE(CIntMax,tyConCIntMax,"CIntMax",HTYPE_INTMAX_T)
223 INTEGRAL_TYPE(CUIntMax,tyConCUIntMax,"CUIntMax",HTYPE_UINTMAX_T)
226 "fromIntegral/a->CIntPtr" fromIntegral = \x -> CIntPtr (fromIntegral x)
227 "fromIntegral/a->CUIntPtr" fromIntegral = \x -> CUIntPtr (fromIntegral x)
228 "fromIntegral/a->CIntMax" fromIntegral = \x -> CIntMax (fromIntegral x)
229 "fromIntegral/a->CUIntMax" fromIntegral = \x -> CUIntMax (fromIntegral x)
232 -- C99 types which are still missing include:
233 -- wint_t, wctrans_t, wctype_t
237 These types are needed to accurately represent C function prototypes,
238 in order to access C library interfaces in Haskell. The Haskell system
239 is not required to represent those types exactly as C does, but the
240 following guarantees are provided concerning a Haskell type @CT@
241 representing a C type @t@:
243 * If a C function prototype has @t@ as an argument or result type, the
244 use of @CT@ in the corresponding position in a foreign declaration
245 permits the Haskell program to access the full range of values encoded
246 by the C type; and conversely, any Haskell value for @CT@ has a valid
249 * @'sizeOf' ('Prelude.undefined' :: CT)@ will yield the same value as
252 * @'alignment' ('Prelude.undefined' :: CT)@ matches the alignment
253 constraint enforced by the C implementation for @t@.
255 * The members 'peek' and 'poke' of the 'Storable' class map all values
256 of @CT@ to the corresponding value of @t@ and vice versa.
258 * When an instance of 'Prelude.Bounded' is defined for @CT@, the values
259 of 'Prelude.minBound' and 'Prelude.maxBound' coincide with @t_MIN@
262 * When an instance of 'Prelude.Eq' or 'Prelude.Ord' is defined for @CT@,
263 the predicates defined by the type class implement the same relation
264 as the corresponding predicate in C on @t@.
266 * When an instance of 'Prelude.Num', 'Prelude.Read', 'Prelude.Integral',
267 'Prelude.Fractional', 'Prelude.Floating', 'Prelude.RealFrac', or
268 'Prelude.RealFloat' is defined for @CT@, the arithmetic operations
269 defined by the type class implement the same function as the
270 corresponding arithmetic operations (if available) in C on @t@.
272 * When an instance of 'Bits' is defined for @CT@, the bitwise operation
273 defined by the type class implement the same function as the
274 corresponding bitwise operation in C on @t@.
281 ( CChar(..), CSChar(..), CUChar(..)
282 , CShort(..), CUShort(..), CInt(..), CUInt(..)
283 , CLong(..), CULong(..), CLLong(..), CULLong(..)
284 , CPtrdiff(..), CSize(..), CWchar(..), CSigAtomic(..)
285 , CClock(..), CTime(..)
286 , CFloat(..), CDouble(..), CLDouble(..)
287 , CFile, CFpos, CJmpBuf
291 import NHC.SizedTypes
293 #define INSTANCE_BITS(T) \
294 instance Bits T where { \
295 (T x) .&. (T y) = T (x .&. y) ; \
296 (T x) .|. (T y) = T (x .|. y) ; \
297 (T x) `xor` (T y) = T (x `xor` y) ; \
298 complement (T x) = T (complement x) ; \
299 shift (T x) n = T (shift x n) ; \
300 rotate (T x) n = T (rotate x n) ; \
301 bit n = T (bit n) ; \
302 setBit (T x) n = T (setBit x n) ; \
303 clearBit (T x) n = T (clearBit x n) ; \
304 complementBit (T x) n = T (complementBit x n) ; \
305 testBit (T x) n = testBit x n ; \
306 bitSize (T x) = bitSize x ; \
307 isSigned (T x) = isSigned x }
310 INSTANCE_BITS(CSChar)
311 INSTANCE_BITS(CUChar)
312 INSTANCE_BITS(CShort)
313 INSTANCE_BITS(CUShort)
317 INSTANCE_BITS(CULong)
318 INSTANCE_BITS(CLLong)
319 INSTANCE_BITS(CULLong)
320 INSTANCE_BITS(CPtrdiff)
321 INSTANCE_BITS(CWchar)
322 INSTANCE_BITS(CSigAtomic)