1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y M B O L S . P R O C E S S I N G --
9 -- Copyright (C) 2003-2006, Free Software Foundation, Inc. --
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. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 -- This is the VMS Alpha version of this package
30 package body Processing is
32 type Number is mod 2**16;
33 -- 16 bits unsigned number for number of characters
35 GSD : constant Number := 10;
36 -- Code for the Global Symbol Definition section
38 C_SYM : constant Number := 1;
39 -- Code for a Symbol subsection
41 V_DEF_Mask : constant Number := 2**1;
42 V_NORM_Mask : constant Number := 2**6;
46 Number_Of_Characters : Natural := 0;
47 -- The number of characters of each section
49 -- The following variables are used by procedure Process when reading an
53 Length : Natural := 0;
57 Nchars : Natural := 0;
60 Symbol : String (1 .. 255);
63 procedure Get (N : out Number);
64 -- Read two bytes from the object file LSB first as unsigned 16 bit number
66 procedure Get (N : out Natural);
67 -- Read two bytes from the object file, LSByte first, as a Natural
73 procedure Get (N : out Number) is
78 LSByte := Byte'Pos (C);
80 N := LSByte + (256 * Byte'Pos (C));
83 procedure Get (N : out Natural) is
87 N := Natural (Result);
95 (Object_File : String;
96 Success : out Boolean)
101 -- Open the object file with Byte_IO. Return with Success = False if
105 Open (File, In_File, Object_File);
109 ("*** Unable to open object file """ & Object_File & """");
114 -- Assume that the object file has a correct format
118 -- Get the different sections one by one from the object file
120 while not End_Of_File (File) loop
123 Get (Number_Of_Characters);
124 Number_Of_Characters := Number_Of_Characters - 4;
126 -- If this is not a Global Symbol Definition section, skip to the
131 for J in 1 .. Number_Of_Characters loop
137 -- Skip over the next 4 bytes
141 Number_Of_Characters := Number_Of_Characters - 4;
143 -- Get each subsection in turn
150 Number_Of_Characters := Number_Of_Characters - 8;
151 Nchars := Nchars - 8;
153 -- If this is a symbol and the V_DEF flag is set, get the
156 if Code = C_SYM and then ((Flags and V_DEF_Mask) /= 0) then
157 -- First, reach the symbol length
159 for J in 1 .. 25 loop
161 Nchars := Nchars - 1;
162 Number_Of_Characters := Number_Of_Characters - 1;
165 Length := Byte'Pos (B);
168 -- Get the symbol characters
170 for J in 1 .. Nchars loop
172 Number_Of_Characters := Number_Of_Characters - 1;
176 Length := Length - 1;
180 -- Check if it is a symbol from a generic body
184 for J in 1 .. LSymb - 2 loop
185 if Symbol (J) = 'G' and then Symbol (J + 1) = 'P'
186 and then Symbol (J + 2) in '0' .. '9'
195 -- Create the new Symbol
198 S_Data : Symbol_Data;
201 S_Data.Name := new String'(Symbol (1 .. LSymb));
203 -- The symbol kind (Data or Procedure) depends on the
206 if (Flags and V_NORM_Mask) = 0 then
213 -- Put the new symbol in the table
215 Symbol_Table.Increment_Last (Complete_Symbols);
216 Complete_Symbols.Table
217 (Symbol_Table.Last (Complete_Symbols)) := S_Data;
222 -- As it is not a symbol subsection, skip to the next
225 for J in 1 .. Nchars loop
227 Number_Of_Characters := Number_Of_Characters - 1;
231 -- Exit the GSD section when number of characters reaches 0
233 exit when Number_Of_Characters = 0;
238 -- The object file has been processed, close it
243 -- For any exception, output an error message, close the object file
244 -- and return with Success = False.
247 Put_Line ("unexpected exception raised while processing """
248 & Object_File & """");
249 Put_Line (Exception_Information (X));