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) 2004-2009, 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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 pragma Compiler_Unit;
  33
  34 with Ada.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 Ada.Unchecked_Conversion (Address, IA);
  42    function A is new Ada.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;