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) 2004-2013, 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
32pragma Compiler_Unit_Warning;
33
34with Ada.Unchecked_Conversion;
35
36package 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
110end System.Address_Operations;
111