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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . A D D R E S S _ I M A G E --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with Ada.Unchecked_Conversion;
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33
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34 function System.Address_Image (A : Address) return String is
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35
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36 Result : String (1 .. 2 * Address'Size / Storage_Unit);
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37
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38 type Byte is mod 2 ** 8;
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39 for Byte'Size use 8;
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40
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41 Hexdigs :
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42 constant array (Byte range 0 .. 15) of Character := "0123456789ABCDEF";
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43
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44 type Bytes is array (1 .. Address'Size / Storage_Unit) of Byte;
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45 for Bytes'Size use Address'Size;
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46
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47 function To_Bytes is new Ada.Unchecked_Conversion (Address, Bytes);
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48
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49 Byte_Sequence : constant Bytes := To_Bytes (A);
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50
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51 LE : constant := Standard'Default_Bit_Order;
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52 BE : constant := 1 - LE;
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53 -- Set to 1/0 for True/False for Little-Endian/Big-Endian
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54
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55 Start : constant Natural := BE * (1) + LE * (Bytes'Length);
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56 Incr : constant Integer := BE * (1) + LE * (-1);
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57 -- Start and increment for accessing characters of address string
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58
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59 Ptr : Natural;
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60 -- Scan address string
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61
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62 begin
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63 Ptr := Start;
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64 for N in Bytes'Range loop
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65 Result (2 * N - 1) := Hexdigs (Byte_Sequence (Ptr) / 16);
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66 Result (2 * N) := Hexdigs (Byte_Sequence (Ptr) mod 16);
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67 Ptr := Ptr + Incr;
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68 end loop;
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69
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70 return Result;
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71
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72 end System.Address_Image;
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