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 Free Software Foundation, Inc.            --
  10 --                                                                          --
  11 -- This specification is derived from the Ada Reference Manual for use with --
  12 -- GNAT. The copyright notice above, and the license provisions that follow --
  13 -- apply solely to the implementation dependent sections of this file.      --
  14 --                                                                          --
  15 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  16 -- terms of the  GNU General Public License as published  by the Free Soft- --
  17 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  18 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  19 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  20 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  21 -- for  more details.  You should have  received  a copy of the GNU General --
  22 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  23 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  24 -- MA 02111-1307, USA.                                                      --
  25 --                                                                          --
  26 -- As a special exception,  if other files  instantiate  generics from this --
  27 -- unit, or you link  this unit with other files  to produce an executable, --
  28 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  29 -- covered  by the  GNU  General  Public  License.  This exception does not --
  30 -- however invalidate  any other reasons why  the executable file  might be --
  31 -- covered by the  GNU Public License.                                      --
  32 --                                                                          --
  33 -- GNAT was originally developed  by the GNAT team at  New York University. --
  34 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  35 --                                                                          --
  36 ------------------------------------------------------------------------------
  37
  38 with Unchecked_Conversion;
  39
  40 package body System.Address_Operations is
  41
  42    type IA is mod 2 ** Address'Size;
  43    --  The type used to provide the actual desired operations
  44
  45    function I is new Unchecked_Conversion (Address, IA);
  46    function A is new Unchecked_Conversion (IA, Address);
  47    --  The operations are implemented by unchecked conversion to type IA,
  48    --  followed by doing the intrinsic operation on the IA values, followed
  49    --  by converting the result back to type Address.
  50
  51    ----------
  52    -- AddA --
  53    ----------
  54
  55    function AddA (Left, Right : Address) return Address is
  56    begin
  57       return A (I (Left) + I (Right));
  58    end AddA;
  59
  60    ----------
  61    -- AndA --
  62    ----------
  63
  64    function AndA (Left, Right : Address) return Address is
  65    begin
  66       return A (I (Left) and I (Right));
  67    end AndA;
  68
  69    ----------
  70    -- DivA --
  71    ----------
  72
  73    function DivA (Left, Right : Address) return Address is
  74    begin
  75       return A (I (Left) / I (Right));
  76    end DivA;
  77
  78    ----------
  79    -- ModA --
  80    ----------
  81
  82    function ModA (Left, Right : Address) return Address is
  83    begin
  84       return A (I (Left) mod I (Right));
  85    end ModA;
  86
  87    ---------
  88    -- MulA --
  89    ---------
  90
  91    function MulA (Left, Right : Address) return Address is
  92    begin
  93       return A (I (Left) * I (Right));
  94    end MulA;
  95
  96    ---------
  97    -- OrA --
  98    ---------
  99
 100    function OrA (Left, Right : Address) return Address is
 101    begin
 102       return A (I (Left) or I (Right));
 103    end OrA;
 104
 105    ----------
 106    -- SubA --
 107    ----------
 108
 109    function SubA (Left, Right : Address) return Address is
 110    begin
 111       return A (I (Left) - I (Right));
 112    end SubA;
 113
 114 end System.Address_Operations;