ghc/lib/std/PrelCTypes.lhs

   1 % -----------------------------------------------------------------------------
   2 % $Id: PrelCTypes.lhs,v 1.3 2001/02/22 16:48:24 qrczak 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 module PrelCTypes
  13         ( -- Integral types, instances of: Eq, Ord, Num, Read, Show, Enum,
  14           -- Typeable, Storable, Bounded, Real, Integral, Bits
  15           CChar(..),    CSChar(..),  CUChar(..)
  16         , CShort(..),   CUShort(..), CInt(..),    CUInt(..)
  17         , CLong(..),    CULong(..),  CLLong(..),  CULLong(..)
  18
  19           -- Floating types, instances of: Eq, Ord, Num, Read, Show, Enum,
  20           -- Typeable, Storable, Real, Fractional, Floating, RealFrac, RealFloat
  21         , CFloat(..),   CDouble(..), CLDouble(..)
  22         ) where
  23 \end{code}
  24
  25 \begin{code}
  26 import PrelBase ( unsafeCoerce# )
  27 import PrelBits ( Bits(..) )
  28 import PrelInt  ( Int8,  Int16,  Int32,  Int64  )
  29 import PrelWord ( Word8, Word16, Word32, Word64 )
  30 \end{code}
  31
  32 \begin{code}
  33 INTEGRAL_TYPE(CChar,tyConCChar,"CChar",HTYPE_CHAR)
  34 INTEGRAL_TYPE(CSChar,tyConCSChar,"CSChar",HTYPE_SIGNED_CHAR)
  35 INTEGRAL_TYPE(CUChar,tyConCUChar,"CUChar",HTYPE_UNSIGNED_CHAR)
  36
  37 INTEGRAL_TYPE(CShort,tyConCShort,"CShort",HTYPE_SHORT)
  38 INTEGRAL_TYPE(CUShort,tyConCUShort,"CUShort",HTYPE_UNSIGNED_SHORT)
  39
  40 INTEGRAL_TYPE(CInt,tyConCInt,"CInt",HTYPE_INT)
  41 INTEGRAL_TYPE(CUInt,tyConCUInt,"CUInt",HTYPE_UNSIGNED_INT)
  42
  43 INTEGRAL_TYPE(CLong,tyConCLong,"CLong",HTYPE_LONG)
  44 INTEGRAL_TYPE(CULong,tyConCULong,"CULong",HTYPE_UNSIGNED_LONG)
  45
  46 INTEGRAL_TYPE(CLLong,tyConCLLong,"CLLong",HTYPE_LONG_LONG)
  47 INTEGRAL_TYPE(CULLong,tyConCULLong,"CULLong",HTYPE_UNSIGNED_LONG_LONG)
  48
  49 {-# RULES
  50 "fromIntegral/a->CChar"   fromIntegral = \x -> CChar   (fromIntegral x)
  51 "fromIntegral/a->CSChar"  fromIntegral = \x -> CSChar  (fromIntegral x)
  52 "fromIntegral/a->CUChar"  fromIntegral = \x -> CUChar  (fromIntegral x)
  53 "fromIntegral/a->CShort"  fromIntegral = \x -> CShort  (fromIntegral x)
  54 "fromIntegral/a->CUShort" fromIntegral = \x -> CUShort (fromIntegral x)
  55 "fromIntegral/a->CInt"    fromIntegral = \x -> CInt    (fromIntegral x)
  56 "fromIntegral/a->CUInt"   fromIntegral = \x -> CUInt   (fromIntegral x)
  57 "fromIntegral/a->CLong"   fromIntegral = \x -> CLong   (fromIntegral x)
  58 "fromIntegral/a->CULong"  fromIntegral = \x -> CULong  (fromIntegral x)
  59 "fromIntegral/a->CLLong"  fromIntegral = \x -> CLLong  (fromIntegral x)
  60 "fromIntegral/a->CULLong" fromIntegral = \x -> CULLong (fromIntegral x)
  61
  62 "fromIntegral/CChar->a"   fromIntegral = \(CChar   x) -> fromIntegral x
  63 "fromIntegral/CSChar->a"  fromIntegral = \(CSChar  x) -> fromIntegral x
  64 "fromIntegral/CUChar->a"  fromIntegral = \(CUChar  x) -> fromIntegral x
  65 "fromIntegral/CShort->a"  fromIntegral = \(CShort  x) -> fromIntegral x
  66 "fromIntegral/CUShort->a" fromIntegral = \(CUShort x) -> fromIntegral x
  67 "fromIntegral/CInt->a"    fromIntegral = \(CInt    x) -> fromIntegral x
  68 "fromIntegral/CUInt->a"   fromIntegral = \(CUInt   x) -> fromIntegral x
  69 "fromIntegral/CLong->a"   fromIntegral = \(CLong   x) -> fromIntegral x
  70 "fromIntegral/CULong->a"  fromIntegral = \(CULong  x) -> fromIntegral x
  71 "fromIntegral/CLLong->a"  fromIntegral = \(CLLong  x) -> fromIntegral x
  72 "fromIntegral/CULLong->a" fromIntegral = \(CULLong x) -> fromIntegral x
  73  #-}
  74
  75 FLOATING_TYPE(CFloat,tyConCFloat,"CFloat",HTYPE_FLOAT)
  76 FLOATING_TYPE(CDouble,tyConCDouble,"CDouble",HTYPE_DOUBLE)
  77 -- HACK: Currently no long double in the FFI, so we simply re-use double
  78 FLOATING_TYPE(CLDouble,tyConCLDouble,"CLDouble",HTYPE_DOUBLE)
  79 \end{code}