gcc/ada/s-addope.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --             S Y S T E M . A D D R E S S _ O P E R A T I O N S            --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2004-2006 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with Unchecked_Conversion;
  35
  36 package body System.Address_Operations is
  37
  38    type IA is mod 2 ** Address'Size;
  39    --  The type used to provide the actual desired operations
  40
  41    function I is new Unchecked_Conversion (Address, IA);
  42    function A is new Unchecked_Conversion (IA, Address);
  43    --  The operations are implemented by unchecked conversion to type IA,
  44    --  followed by doing the intrinsic operation on the IA values, followed
  45    --  by converting the result back to type Address.
  46
  47    ----------
  48    -- AddA --
  49    ----------
  50
  51    function AddA (Left, Right : Address) return Address is
  52    begin
  53       return A (I (Left) + I (Right));
  54    end AddA;
  55
  56    ----------
  57    -- AndA --
  58    ----------
  59
  60    function AndA (Left, Right : Address) return Address is
  61    begin
  62       return A (I (Left) and I (Right));
  63    end AndA;
  64
  65    ----------
  66    -- DivA --
  67    ----------
  68
  69    function DivA (Left, Right : Address) return Address is
  70    begin
  71       return A (I (Left) / I (Right));
  72    end DivA;
  73
  74    ----------
  75    -- ModA --
  76    ----------
  77
  78    function ModA (Left, Right : Address) return Address is
  79    begin
  80       return A (I (Left) mod I (Right));
  81    end ModA;
  82
  83    ---------
  84    -- MulA --
  85    ---------
  86
  87    function MulA (Left, Right : Address) return Address is
  88    begin
  89       return A (I (Left) * I (Right));
  90    end MulA;
  91
  92    ---------
  93    -- OrA --
  94    ---------
  95
  96    function OrA (Left, Right : Address) return Address is
  97    begin
  98       return A (I (Left) or I (Right));
  99    end OrA;
 100
 101    ----------
 102    -- SubA --
 103    ----------
 104
 105    function SubA (Left, Right : Address) return Address is
 106    begin
 107       return A (I (Left) - I (Right));
 108    end SubA;
 109
 110 end System.Address_Operations;