Package Name: interfaces

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------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                           I N T E R F A C E S                            --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--                            $Revision: 1.11 $                             --
--                                                                          --
-- This specification is adapted from the Ada Reference Manual for use with --
-- GNAT.  In accordance with the copyright of that document, you can freely --
-- copy and modify this specification,  provided that if you redistribute a --
-- modified version,  any changes that you have made are clearly indicated. --
--                                                                          --

------------------------------------------------------------------------------
--  At the moment there is only one version of this source package available.
--  It assumes integer sizes of 8, 16, 32 and 64 are available, and that the
--  floating-point formats are IEEE compatible. Specialization of this file

--  may be required later if these assumptions are not correct for some target.
package Interfaces is

pragma Pure (Interfaces);
   type Integer_8  is range -2 **  7 .. 2 **  7 - 1;

   for Integer_8'Size use  8;
   type Integer_16 is range -2 ** 15 .. 2 ** 15 - 1;

   for Integer_16'Size use 16;
   type Integer_32 is range -2 ** 31 .. 2 ** 31 - 1;

   for Integer_32'Size use 32;
   type Integer_64 is range -2 ** 63 .. 2 ** 63 - 1;

   for Integer_64'Size use 64;
   type Unsigned_8  is mod 2 **  8;

   for Unsigned_8'Size use  8;
   type Unsigned_16 is mod 2 ** 16;

   for Unsigned_16'Size use 16;
   type Unsigned_32 is mod 2 ** 32;

   for Unsigned_32'Size use 32;
   type Unsigned_64 is mod 2 ** 64;

   for Unsigned_64'Size use 64;
   function Shift_Left
     (Value  : Unsigned_8;
      Amount : Natural)

     return    Unsigned_8;
   function Shift_Right
     (Value  : Unsigned_8;
      Amount : Natural)

      return   Unsigned_8;
   function Shift_Right_Arithmetic
     (Value  : Unsigned_8;
      Amount : Natural)

      return   Unsigned_8;
   function Rotate_Left
     (Value  : Unsigned_8;
      Amount : Natural)

      return   Unsigned_8;
   function Rotate_Right
     (Value  : Unsigned_8;
      Amount : Natural)

      return   Unsigned_8;
   function Shift_Left
     (Value  : Unsigned_16;
      Amount : Natural)

     return    Unsigned_16;
   function Shift_Right
     (Value  : Unsigned_16;
      Amount : Natural)

      return   Unsigned_16;
   function Shift_Right_Arithmetic
     (Value  : Unsigned_16;
      Amount : Natural)

      return   Unsigned_16;
   function Rotate_Left
     (Value  : Unsigned_16;
      Amount : Natural)

      return   Unsigned_16;
   function Rotate_Right
     (Value  : Unsigned_16;
      Amount : Natural)

      return   Unsigned_16;
   function Shift_Left
     (Value  : Unsigned_32;
      Amount : Natural)

     return    Unsigned_32;
   function Shift_Right
     (Value  : Unsigned_32;
      Amount : Natural)

      return   Unsigned_32;
   function Shift_Right_Arithmetic
     (Value  : Unsigned_32;
      Amount : Natural)

      return   Unsigned_32;
   function Rotate_Left
     (Value  : Unsigned_32;
      Amount : Natural)

      return   Unsigned_32;
   function Rotate_Right
     (Value  : Unsigned_32;
      Amount : Natural)

      return   Unsigned_32;
   function Shift_Left
     (Value  : Unsigned_64;
      Amount : Natural)

     return    Unsigned_64;
   function Shift_Right
     (Value  : Unsigned_64;
      Amount : Natural)

      return   Unsigned_64;
   function Shift_Right_Arithmetic
     (Value  : Unsigned_64;
      Amount : Natural)

      return   Unsigned_64;
   function Rotate_Left
     (Value  : Unsigned_64;
      Amount : Natural)

      return   Unsigned_64;
   function Rotate_Right
     (Value  : Unsigned_64;
      Amount : Natural)

      return   Unsigned_64;
   pragma Import (Intrinsic, Shift_Left);
   pragma Import (Intrinsic, Shift_Right);
   pragma Import (Intrinsic, Shift_Right_Arithmetic);
   pragma Import (Intrinsic, Rotate_Left);

   pragma Import (Intrinsic, Rotate_Right);
   --  Floating point types. We assume that we are on an IEEE machine, and
   --  that the types Short_Float and Long_Float in Standard refer to the
   --  32-bit short and 64-bit long IEEE forms. Furthermore, if there is
   --  an extended float, we assume that it is available as Long_Long_Float.
   --  Note: it is harmless, and explicitly permitted, to include additional
   --  types in interfaces, so it is not wrong to have IEEE_Extended_Float

   --  defined even if the extended format is not available.
   type IEEE_Float_32       is new Short_Float;
   type IEEE_Float_64       is new Long_Float;

   type IEEE_Extended_Float is new Long_Long_Float;
end Interfaces;