gcc/ada/s-addima.adb

   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) 1992-2009, 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 with Ada.Unchecked_Conversion;
  33
  34 function 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
  62 begin
  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
  72 end System.Address_Image;