ghc/lib/std/PrelCTypes.lhs

   1 % -----------------------------------------------------------------------------
   2 % $Id: PrelCTypes.lhs,v 1.5 2002/02/04 09:05:46 chak Exp $
   3 %
   4 % (c) The FFI task force, 2000
   5 %
   6
   7 A mapping of C types to corresponding Haskell types. A cool hack...
   8
   9 #include "cbits/CTypes.h"
  10
  11 \begin{code}
  12 {-# OPTIONS -fno-implicit-prelude #-}
  13
  14 module PrelCTypes
  15         ( -- Integral types, instances of: Eq, Ord, Num, Read, Show, Enum,
  16           -- Typeable, Storable, Bounded, Real, Integral, Bits
  17           CChar(..),  CSChar(..),  CUChar(..)
  18         , CShort(..), CUShort(..), CInt(..),   CUInt(..)
  19         , CLong(..),  CULong(..),  CLLong(..), CULLong(..)
  20
  21           -- Floating types, instances of: Eq, Ord, Num, Read, Show, Enum,
  22           -- Typeable, Storable, Real, Fractional, Floating, RealFrac,
  23           -- RealFloat
  24         , CFloat(..),  CDouble(..), CLDouble(..)
  25         ) where
  26 \end{code}
  27
  28 \begin{code}
  29 import PrelBase
  30 import PrelFloat
  31 import PrelEnum
  32 import PrelReal
  33 import PrelShow
  34 import PrelRead
  35 import PrelNum
  36 import PrelBits ( Bits(..) )
  37 import PrelInt  ( Int8,  Int16,  Int32,  Int64  )
  38 import PrelWord ( Word8, Word16, Word32, Word64 )
  39 \end{code}
  40
  41 \begin{code}
  42 INTEGRAL_TYPE(CChar,tyConCChar,"CChar",HTYPE_CHAR)
  43 INTEGRAL_TYPE(CSChar,tyConCSChar,"CSChar",HTYPE_SIGNED_CHAR)
  44 INTEGRAL_TYPE(CUChar,tyConCUChar,"CUChar",HTYPE_UNSIGNED_CHAR)
  45
  46 INTEGRAL_TYPE(CShort,tyConCShort,"CShort",HTYPE_SHORT)
  47 INTEGRAL_TYPE(CUShort,tyConCUShort,"CUShort",HTYPE_UNSIGNED_SHORT)
  48
  49 INTEGRAL_TYPE(CInt,tyConCInt,"CInt",HTYPE_INT)
  50 INTEGRAL_TYPE(CUInt,tyConCUInt,"CUInt",HTYPE_UNSIGNED_INT)
  51
  52 INTEGRAL_TYPE(CLong,tyConCLong,"CLong",HTYPE_LONG)
  53 INTEGRAL_TYPE(CULong,tyConCULong,"CULong",HTYPE_UNSIGNED_LONG)
  54
  55 INTEGRAL_TYPE(CLLong,tyConCLLong,"CLLong",HTYPE_LONG_LONG)
  56 INTEGRAL_TYPE(CULLong,tyConCULLong,"CULLong",HTYPE_UNSIGNED_LONG_LONG)
  57
  58 {-# RULES
  59 "fromIntegral/a->CChar"   fromIntegral = \x -> CChar   (fromIntegral x)
  60 "fromIntegral/a->CSChar"  fromIntegral = \x -> CSChar  (fromIntegral x)
  61 "fromIntegral/a->CUChar"  fromIntegral = \x -> CUChar  (fromIntegral x)
  62 "fromIntegral/a->CShort"  fromIntegral = \x -> CShort  (fromIntegral x)
  63 "fromIntegral/a->CUShort" fromIntegral = \x -> CUShort (fromIntegral x)
  64 "fromIntegral/a->CInt"    fromIntegral = \x -> CInt    (fromIntegral x)
  65 "fromIntegral/a->CUInt"   fromIntegral = \x -> CUInt   (fromIntegral x)
  66 "fromIntegral/a->CLong"   fromIntegral = \x -> CLong   (fromIntegral x)
  67 "fromIntegral/a->CULong"  fromIntegral = \x -> CULong  (fromIntegral x)
  68 "fromIntegral/a->CLLong"  fromIntegral = \x -> CLLong  (fromIntegral x)
  69 "fromIntegral/a->CULLong" fromIntegral = \x -> CULLong (fromIntegral x)
  70
  71 "fromIntegral/CChar->a"   fromIntegral = \(CChar   x) -> fromIntegral x
  72 "fromIntegral/CSChar->a"  fromIntegral = \(CSChar  x) -> fromIntegral x
  73 "fromIntegral/CUChar->a"  fromIntegral = \(CUChar  x) -> fromIntegral x
  74 "fromIntegral/CShort->a"  fromIntegral = \(CShort  x) -> fromIntegral x
  75 "fromIntegral/CUShort->a" fromIntegral = \(CUShort x) -> fromIntegral x
  76 "fromIntegral/CInt->a"    fromIntegral = \(CInt    x) -> fromIntegral x
  77 "fromIntegral/CUInt->a"   fromIntegral = \(CUInt   x) -> fromIntegral x
  78 "fromIntegral/CLong->a"   fromIntegral = \(CLong   x) -> fromIntegral x
  79 "fromIntegral/CULong->a"  fromIntegral = \(CULong  x) -> fromIntegral x
  80 "fromIntegral/CLLong->a"  fromIntegral = \(CLLong  x) -> fromIntegral x
  81 "fromIntegral/CULLong->a" fromIntegral = \(CULLong x) -> fromIntegral x
  82  #-}
  83
  84 FLOATING_TYPE(CFloat,tyConCFloat,"CFloat",HTYPE_FLOAT)
  85 FLOATING_TYPE(CDouble,tyConCDouble,"CDouble",HTYPE_DOUBLE)
  86 -- HACK: Currently no long double in the FFI, so we simply re-use double
  87 FLOATING_TYPE(CLDouble,tyConCLDouble,"CLDouble",HTYPE_DOUBLE)
  88 \end{code}