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) 1992,1993,1994,1995,1996 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with Unchecked_Conversion;
  35
  36 function System.Address_Image (A : Address) return String is
  37
  38    Result  : String (1 .. 2 * Address'Size / Storage_Unit);
  39
  40    type Byte is mod 2 ** 8;
  41    for Byte'Size use 8;
  42
  43    Hexdigs :
  44      constant array (Byte range 0 .. 15) of Character := "0123456789ABCDEF";
  45
  46    type Bytes is array (1 .. Address'Size / Storage_Unit) of Byte;
  47    for Bytes'Size use Address'Size;
  48
  49    function To_Bytes is new Unchecked_Conversion (Address, Bytes);
  50
  51    Byte_Sequence : constant Bytes := To_Bytes (A);
  52
  53    LE : constant := Standard'Default_Bit_Order;
  54    BE : constant := 1 - LE;
  55    --  Set to 1/0 for True/False for Little-Endian/Big-Endian
  56
  57    Start : constant Natural := BE * (1) + LE * (Bytes'Length);
  58    Incr  : constant Integer := BE * (1) + LE * (-1);
  59    --  Start and increment for accessing characters of address string
  60
  61    Ptr : Natural;
  62    --  Scan address string
  63
  64 begin
  65    Ptr := Start;
  66    for N in Bytes'Range loop
  67       Result (2 * N - 1) := Hexdigs (Byte_Sequence (Ptr) / 16);
  68       Result (2 * N)     := Hexdigs (Byte_Sequence (Ptr) mod 16);
  69       Ptr := Ptr + Incr;
  70    end loop;
  71
  72    return Result;
  73
  74 end System.Address_Image;