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) 2004-2006, 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/IA64 version of this package
29 with Ada.IO_Exceptions;
31 with Ada.Unchecked_Deallocation;
34 package body Processing is
36 type String_Array is array (Positive range <>) of String_Access;
37 type Strings_Ptr is access String_Array;
40 new Ada.Unchecked_Deallocation (String_Array, Strings_Ptr);
42 type Section_Header is record
50 type Section_Header_Array is array (Natural range <>) of Section_Header;
51 type Section_Header_Ptr is access Section_Header_Array;
54 new Ada.Unchecked_Deallocation (Section_Header_Array, Section_Header_Ptr);
61 (Object_File : String;
62 Success : out Boolean)
68 Str : String (1 .. 1000) := (others => ' ');
71 Strings : Strings_Ptr;
83 Symtab_Index : Natural := 0;
84 String_Table_Index : Natural := 0;
94 Section_Headers : Section_Header_Ptr;
96 Offset : Natural := 0;
99 procedure Get_Byte (B : out Byte);
100 procedure Get_Half (H : out Integer);
101 procedure Get_Word (W : out Integer);
103 -- All the above require comments ???
109 procedure Get_Byte (B : out Byte) is
111 Byte_IO.Read (File, B);
112 Offset := Offset + 1;
119 procedure Get_Half (H : out Integer) is
122 Get_Byte (C1); Get_Byte (C2);
124 Integer'(Character'Pos (C2)) * 256 + Integer'(Character'Pos (C1));
131 procedure Get_Word (W : out Integer) is
134 Get_Half (H1); Get_Half (H2);
135 W := H2 * 256 * 256 + H1;
145 Byte_IO.Reset (File);
148 -- Start of processing for Process
151 -- Open the object file with Byte_IO. Return with Success = False if
155 Open (File, In_File, Object_File);
159 ("*** Unable to open object file """ & Object_File & """");
164 -- Assume that the object file has a correct format
168 -- Skip ELF identification
170 while Offset < 16 loop
200 -- Skip upper half of Shoff
222 Get_Half (Shentsize);
226 Section_Headers := new Section_Header_Array (0 .. Shnum - 1);
228 -- Go to Section Headers
230 while Offset < Shoff loop
234 -- Reset Symtab_Index
238 for J in Section_Headers'Range loop
240 -- Get the data for each Section Header
245 for K in 1 .. 16 loop
257 while (Offset - Shoff) mod Shentsize /= 0 loop
261 -- If this is the Symbol Table Section Header, record its index
267 Section_Headers (J) := (Shname, Shtype, Shoffset, Shsize, Shlink);
270 if Symtab_Index = 0 then
276 Section_Headers (Symtab_Index).Shoffset +
277 Section_Headers (Symtab_Index).Shsize;
279 String_Table_Index := Section_Headers (Symtab_Index).Shlink;
281 new String_Array (1 .. Section_Headers (String_Table_Index).Shsize);
283 -- Go get the String Table section for the Symbol Table
287 while Offset < Section_Headers (String_Table_Index).Shoffset loop
293 Get_Byte (B); -- zero
295 while Offset < Section_Headers (String_Table_Index).Shsize loop
300 if B /= ASCII.NUL then
301 Str_Last := Str_Last + 1;
305 Strings (Offset - Str_Last - 1) :=
306 new String'(Str (1 .. Str_Last));
312 -- Go get the Symbol Table
316 while Offset < Section_Headers (Symtab_Index).Shoffset loop
320 while Offset < End_Symtab loop
329 Sttype := Integer'(Character'Pos (Stinfo)) mod 16;
330 Stbind := Integer'(Character'Pos (Stinfo)) / 16;
332 if (Sttype = 1 or else Sttype = 2)
334 and then Stshndx /= 0
336 -- Check if this is a symbol from a generic body
340 for J in Strings (Stname)'First .. Strings (Stname)'Last - 2 loop
341 if Strings (Stname) (J) = 'G'
342 and then Strings (Stname) (J + 1) = 'P'
343 and then Strings (Stname) (J + 2) in '0' .. '9'
352 S_Data : Symbol_Data;
354 S_Data.Name := new String'(Strings (Stname).all);
363 -- Put the new symbol in the table
365 Symbol_Table.Increment_Last (Complete_Symbols);
366 Complete_Symbols.Table
367 (Symbol_Table.Last (Complete_Symbols)) := S_Data;
373 -- The object file has been processed, close it
377 -- Free the allocated memory
379 Free (Section_Headers);
381 for J in Strings'Range loop
382 if Strings (J) /= null then
390 -- For any exception, output an error message, close the object file
391 -- and return with Success = False.
393 when Ada.IO_Exceptions.End_Error =>
397 Put_Line ("unexpected exception raised while processing """
398 & Object_File & """");
399 Put_Line (Exception_Information (X));