1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 2003 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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, 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 version of this package
29 with Ada.Exceptions; use Ada.Exceptions;
30 with Ada.Sequential_IO;
31 with Ada.Text_IO; use Ada.Text_IO;
33 package body Symbols is
35 Case_Sensitive : constant String := "case_sensitive=";
36 Symbol_Vector : constant String := "SYMBOL_VECTOR=(";
37 Equal_Data : constant String := "=DATA)";
38 Equal_Procedure : constant String := "=PROCEDURE)";
39 Gsmatch : constant String := "gsmatch=equal,";
41 Symbol_File_Name : String_Access := null;
42 -- Name of the symbol file
44 Sym_Policy : Policy := Autonomous;
45 -- The symbol policy. Set by Initialize
47 Major_ID : Integer := 1;
48 -- The Major ID. May be modified by Initialize if Library_Version is
49 -- specified or if it is read from the reference symbol file.
51 Soft_Major_ID : Boolean := True;
52 -- False if library version is specified in procedure Initialize.
53 -- When True, Major_ID may be modified if found in the reference symbol
56 Minor_ID : Natural := 0;
57 -- The Minor ID. May be modified if read from the reference symbol file
59 Soft_Minor_ID : Boolean := True;
60 -- False if symbol policy is Autonomous, if library version is specified
61 -- in procedure Initialize and is not the same as the major ID read from
62 -- the reference symbol file. When True, Minor_ID may be increased in
63 -- Compliant symbol policy.
65 subtype Byte is Character;
66 -- Object files are stream of bytes, but some of these bytes, those for
67 -- the names of the symbols, are ASCII characters.
69 package Byte_IO is new Ada.Sequential_IO (Byte);
72 type Number is mod 2**16;
73 -- 16 bits unsigned number for number of characters
75 GSD : constant Number := 10;
76 -- Code for the Global Symbol Definition section
78 C_SYM : constant Number := 1;
79 -- Code for a Symbol subsection
81 V_DEF_Mask : constant Number := 2**1;
82 V_NORM_Mask : constant Number := 2**6;
84 File : Byte_IO.File_Type;
85 -- Each object file is read as a stream of bytes (characters)
89 Number_Of_Characters : Natural := 0;
90 -- The number of characters of each section
92 -- The following variables are used by procedure Process when reading an
96 Length : Natural := 0;
100 Nchars : Natural := 0;
103 Symbol : String (1 .. 255);
106 function Equal (Left, Right : Symbol_Data) return Boolean;
107 -- Test for equality of symbols
109 procedure Get (N : out Number);
110 -- Read two bytes from the object file LSB first as unsigned 16 bit number
112 procedure Get (N : out Natural);
113 -- Read two bytes from the object file, LSByte first, as a Natural
116 function Image (N : Integer) return String;
117 -- Returns the image of N, without the initial space
123 function Equal (Left, Right : Symbol_Data) return Boolean is
125 return Left.Name /= null and then
126 Right.Name /= null and then
127 Left.Name.all = Right.Name.all and then
128 Left.Kind = Right.Kind and then
129 Left.Present = Right.Present;
136 procedure Get (N : out Number) is
141 LSByte := Byte'Pos (C);
143 N := LSByte + (256 * Byte'Pos (C));
146 procedure Get (N : out Natural) is
150 N := Natural (Result);
157 function Image (N : Integer) return String is
158 Result : constant String := N'Img;
160 if Result (Result'First) = ' ' then
161 return Result (Result'First + 1 .. Result'Last);
173 (Symbol_File : String;
175 Symbol_Policy : Policy;
178 Success : out Boolean)
180 File : Ada.Text_IO.File_Type;
181 Line : String (1 .. 1_000);
185 -- Record the symbol file name
187 Symbol_File_Name := new String'(Symbol_File);
191 Sym_Policy := Symbol_Policy;
193 -- Record the version (Major ID)
197 Soft_Major_ID := True;
201 Major_ID := Integer'Value (Version);
202 Soft_Major_ID := False;
204 if Major_ID <= 0 then
205 raise Constraint_Error;
209 when Constraint_Error =>
211 Put_Line ("Version """ & Version & """ is illegal.");
212 Put_Line ("On VMS, version must be a positive number");
221 Soft_Minor_ID := Sym_Policy /= Autonomous;
223 -- Empty the symbol tables
225 Symbol_Table.Set_Last (Original_Symbols, 0);
226 Symbol_Table.Set_Last (Complete_Symbols, 0);
228 -- Assume that everything will be fine
232 -- If policy is not autonomous, attempt to read the reference file
234 if Sym_Policy /= Autonomous then
236 Open (File, In_File, Reference);
239 when Ada.Text_IO.Name_Error =>
244 Put_Line ("could not open """ & Reference & """");
245 Put_Line (Exception_Message (X));
254 while not End_Of_File (File) loop
255 Get_Line (File, Line, Last);
257 -- Ignore empty lines
262 -- Ignore lines starting with "case_sensitive="
264 elsif Last > Case_Sensitive'Length
265 and then Line (1 .. Case_Sensitive'Length) = Case_Sensitive
269 -- Line starting with "SYMBOL_VECTOR=("
271 elsif Last > Symbol_Vector'Length
272 and then Line (1 .. Symbol_Vector'Length) = Symbol_Vector
275 -- SYMBOL_VECTOR=(<symbol>=DATA)
277 if Last > Symbol_Vector'Length + Equal_Data'Length and then
278 Line (Last - Equal_Data'Length + 1 .. Last) = Equal_Data
280 Symbol_Table.Increment_Last (Original_Symbols);
281 Original_Symbols.Table
282 (Symbol_Table.Last (Original_Symbols)) :=
284 new String'(Line (Symbol_Vector'Length + 1 ..
285 Last - Equal_Data'Length)),
289 -- SYMBOL_VECTOR=(<symbol>=PROCEDURE)
291 elsif Last > Symbol_Vector'Length + Equal_Procedure'Length
293 Line (Last - Equal_Procedure'Length + 1 .. Last) =
296 Symbol_Table.Increment_Last (Original_Symbols);
297 Original_Symbols.Table
298 (Symbol_Table.Last (Original_Symbols)) :=
300 new String'(Line (Symbol_Vector'Length + 1 ..
301 Last - Equal_Procedure'Length)),
305 -- Anything else is incorrectly formatted
309 Put_Line ("symbol file """ & Reference &
310 """ is incorrectly formatted:");
311 Put_Line ("""" & Line (1 .. Last) & """");
319 -- Lines with "gsmatch=equal,<Major_ID>,<Minor_Id>
321 elsif Last > Gsmatch'Length
322 and then Line (1 .. Gsmatch'Length) = Gsmatch
325 Start : Positive := Gsmatch'Length + 1;
326 Finish : Positive := Start;
327 OK : Boolean := True;
332 if Line (Finish) not in '0' .. '9'
333 or else Finish >= Last - 1
339 exit when Line (Finish + 1) = ',';
341 Finish := Finish + 1;
345 ID := Integer'Value (Line (Start .. Finish));
348 -- If Soft_Major_ID is True, it means that
349 -- Library_Version was not specified.
351 if Soft_Major_ID then
354 -- If the Major ID in the reference file is different
355 -- from the Library_Version, then the Minor ID will be 0
356 -- because there is no point in taking the Minor ID in
357 -- the reference file, or incrementing it. So, we set
358 -- Soft_Minor_ID to False, so that we don't modify
359 -- the Minor_ID later.
361 elsif Major_ID /= ID then
362 Soft_Minor_ID := False;
369 if Line (Finish) not in '0' .. '9' then
374 exit when Finish = Last;
376 Finish := Finish + 1;
379 -- Only set Minor_ID if Soft_Minor_ID is True (see above)
381 if OK and then Soft_Minor_ID then
382 Minor_ID := Integer'Value (Line (Start .. Finish));
386 -- If OK is not True, that means the line is not correctly
391 Put_Line ("symbol file """ & Reference &
392 """ is incorrectly formatted");
393 Put_Line ("""" & Line (1 .. Last) & """");
402 -- Anything else is incorrectly formatted
406 Put_Line ("unexpected line in symbol file """ &
408 Put_Line ("""" & Line (1 .. Last) & """");
426 (Object_File : String;
427 Success : out Boolean)
430 -- Open the object file with Byte_IO. Return with Success = False if
434 Open (File, In_File, Object_File);
438 ("*** Unable to open object file """ & Object_File & """");
443 -- Assume that the object file has a correct format
447 -- Get the different sections one by one from the object file
449 while not End_Of_File (File) loop
452 Get (Number_Of_Characters);
453 Number_Of_Characters := Number_Of_Characters - 4;
455 -- If this is not a Global Symbol Definition section, skip to the
460 for J in 1 .. Number_Of_Characters loop
466 -- Skip over the next 4 bytes
470 Number_Of_Characters := Number_Of_Characters - 4;
472 -- Get each subsection in turn
479 Number_Of_Characters := Number_Of_Characters - 8;
480 Nchars := Nchars - 8;
482 -- If this is a symbol and the V_DEF flag is set, get the
485 if Code = C_SYM and then ((Flags and V_DEF_Mask) /= 0) then
486 -- First, reach the symbol length
488 for J in 1 .. 25 loop
490 Nchars := Nchars - 1;
491 Number_Of_Characters := Number_Of_Characters - 1;
494 Length := Byte'Pos (B);
497 -- Get the symbol characters
499 for J in 1 .. Nchars loop
501 Number_Of_Characters := Number_Of_Characters - 1;
505 Length := Length - 1;
509 -- Create the new Symbol
512 S_Data : Symbol_Data;
514 S_Data.Name := new String'(Symbol (1 .. LSymb));
516 -- The symbol kind (Data or Procedure) depends on the
519 if (Flags and V_NORM_Mask) = 0 then
526 -- Put the new symbol in the table
528 Symbol_Table.Increment_Last (Complete_Symbols);
529 Complete_Symbols.Table
530 (Symbol_Table.Last (Complete_Symbols)) := S_Data;
534 -- As it is not a symbol subsection, skip to the next
537 for J in 1 .. Nchars loop
539 Number_Of_Characters := Number_Of_Characters - 1;
543 -- Exit the GSD section when number of characters reaches 0
545 exit when Number_Of_Characters = 0;
550 -- The object file has been processed, close it
555 -- For any exception, output an error message, close the object file
556 -- and return with Success = False.
559 Put_Line ("unexpected exception raised while processing """
560 & Object_File & """");
561 Put_Line (Exception_Information (X));
572 Success : out Boolean)
574 File : Ada.Text_IO.File_Type;
577 S_Data : Symbol_Data;
581 -- Most probable index in the Complete_Symbols of the current symbol
582 -- in Original_Symbol.
587 -- Nothing to be done if Initialize has never been called
589 if Symbol_File_Name = null then
594 -- First find if the symbols in the reference symbol file are also
595 -- in the object files. Note that this is not done if the policy is
596 -- Autonomous, because no reference symbol file has been read.
598 -- Expect the first symbol in the symbol file to also be the first
599 -- in Complete_Symbols.
603 for Index_1 in 1 .. Symbol_Table.Last (Original_Symbols) loop
604 S_Data := Original_Symbols.Table (Index_1);
608 for Index_2 in Cur .. Symbol_Table.Last (Complete_Symbols) loop
609 if Equal (S_Data, Complete_Symbols.Table (Index_2)) then
611 Complete_Symbols.Table (Index_2).Present := False;
613 exit First_Object_Loop;
615 end loop First_Object_Loop;
617 -- If the symbol could not be found between Cur and Last, try
622 for Index_2 in 1 .. Cur - 1 loop
623 if Equal (S_Data, Complete_Symbols.Table (Index_2)) then
625 Complete_Symbols.Table (Index_2).Present := False;
627 exit Second_Object_Loop;
629 end loop Second_Object_Loop;
632 -- If the symbol is not found, mark it as such in the table
635 if (not Quiet) or else Sym_Policy = Controlled then
636 Put_Line ("symbol """ & S_Data.Name.all &
637 """ is no longer present in the object files");
640 if Sym_Policy = Controlled then
644 elsif Soft_Minor_ID then
645 Minor_ID := Minor_ID + 1;
646 Soft_Minor_ID := False;
649 Original_Symbols.Table (Index_1).Present := False;
650 Free (Original_Symbols.Table (Index_1).Name);
652 if Soft_Minor_ID then
653 Minor_ID := Minor_ID + 1;
654 Soft_Minor_ID := False;
659 -- Append additional symbols, if any, to the Original_Symbols table
661 for Index in 1 .. Symbol_Table.Last (Complete_Symbols) loop
662 S_Data := Complete_Symbols.Table (Index);
664 if S_Data.Present then
666 if Sym_Policy = Controlled then
667 Put_Line ("symbol """ & S_Data.Name.all &
668 """ is not in the reference symbol file");
672 elsif Soft_Minor_ID then
673 Minor_ID := Minor_ID + 1;
674 Soft_Minor_ID := False;
677 Symbol_Table.Increment_Last (Original_Symbols);
678 Original_Symbols.Table (Symbol_Table.Last (Original_Symbols)) :=
680 Complete_Symbols.Table (Index).Present := False;
684 -- Create the symbol file
686 Create (File, Ada.Text_IO.Out_File, Symbol_File_Name.all);
688 Put (File, Case_Sensitive);
689 Put_Line (File, "yes");
691 -- Put a line in the symbol file for each symbol in the symbol table
693 for Index in 1 .. Symbol_Table.Last (Original_Symbols) loop
694 if Original_Symbols.Table (Index).Present then
695 Put (File, Symbol_Vector);
696 Put (File, Original_Symbols.Table (Index).Name.all);
698 if Original_Symbols.Table (Index).Kind = Data then
699 Put_Line (File, Equal_Data);
702 Put_Line (File, Equal_Procedure);
705 Free (Original_Symbols.Table (Index).Name);
709 Put (File, Case_Sensitive);
710 Put_Line (File, "NO");
712 -- Put the version IDs
715 Put (File, Image (Major_ID));
717 Put_Line (File, Image (Minor_ID));
725 Symbol_Table.Set_Last (Original_Symbols, 0);
726 Symbol_Table.Set_Last (Complete_Symbols, 0);
728 -- Clear the symbol file name
730 Free (Symbol_File_Name);
737 Put_Line ("unexpected exception raised while finalizing """
738 & Symbol_File_Name.all & """");
739 Put_Line (Exception_Information (X));