gcc/ada/libgnat/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) 2004-2024, 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 with Ada.Unchecked_Conversion;
  33
  34 package body System.Address_Operations is
  35
  36    type IA is mod 2 ** Address'Size;
  37    --  The type used to provide the actual desired operations
  38
  39    function I is new Ada.Unchecked_Conversion (Address, IA);
  40    function A is new Ada.Unchecked_Conversion (IA, Address);
  41    --  The operations are implemented by unchecked conversion to type IA,
  42    --  followed by doing the intrinsic operation on the IA values, followed
  43    --  by converting the result back to type Address.
  44
  45    ----------
  46    -- AddA --
  47    ----------
  48
  49    function AddA (Left, Right : Address) return Address is
  50    begin
  51       return A (I (Left) + I (Right));
  52    end AddA;
  53
  54    ----------
  55    -- AndA --
  56    ----------
  57
  58    function AndA (Left, Right : Address) return Address is
  59    begin
  60       return A (I (Left) and I (Right));
  61    end AndA;
  62
  63    ----------
  64    -- DivA --
  65    ----------
  66
  67    function DivA (Left, Right : Address) return Address is
  68    begin
  69       return A (I (Left) / I (Right));
  70    end DivA;
  71
  72    ----------
  73    -- ModA --
  74    ----------
  75
  76    function ModA (Left, Right : Address) return Address is
  77    begin
  78       return A (I (Left) mod I (Right));
  79    end ModA;
  80
  81    ---------
  82    -- MulA --
  83    ---------
  84
  85    function MulA (Left, Right : Address) return Address is
  86    begin
  87       return A (I (Left) * I (Right));
  88    end MulA;
  89
  90    ---------
  91    -- OrA --
  92    ---------
  93
  94    function OrA (Left, Right : Address) return Address is
  95    begin
  96       return A (I (Left) or I (Right));
  97    end OrA;
  98
  99    ----------
 100    -- SubA --
 101    ----------
 102
 103    function SubA (Left, Right : Address) return Address is
 104    begin
 105       return A (I (Left) - I (Right));
 106    end SubA;
 107
 108 end System.Address_Operations;