1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                  S Y S T E M . A D D R E S S _ I M A G E                 --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2018, 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
32with Ada.Unchecked_Conversion;
33
34function System.Address_Image (A : Address) return String is
35
36   Result  : String (1 .. 2 * Address'Size / Storage_Unit);
37
38   type Byte is mod 2 ** 8;
39   for Byte'Size use 8;
40
41   Hexdigs :
42     constant array (Byte range 0 .. 15) of Character := "0123456789ABCDEF";
43
44   type Bytes is array (1 .. Address'Size / Storage_Unit) of Byte;
45   for Bytes'Size use Address'Size;
46
47   function To_Bytes is new Ada.Unchecked_Conversion (Address, Bytes);
48
49   Byte_Sequence : constant Bytes := To_Bytes (A);
50
51   LE : constant := Standard'Default_Bit_Order;
52   BE : constant := 1 - LE;
53   --  Set to 1/0 for True/False for Little-Endian/Big-Endian
54
55   Start : constant Natural := BE * (1) + LE * (Bytes'Length);
56   Incr  : constant Integer := BE * (1) + LE * (-1);
57   --  Start and increment for accessing characters of address string
58
59   Ptr : Natural;
60   --  Scan address string
61
62begin
63   Ptr := Start;
64   for N in Bytes'Range loop
65      Result (2 * N - 1) := Hexdigs (Byte_Sequence (Ptr) / 16);
66      Result (2 * N)     := Hexdigs (Byte_Sequence (Ptr) mod 16);
67      Ptr := Ptr + Incr;
68   end loop;
69
70   return Result;
71
72end System.Address_Image;
73