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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              G N A T S Y M                               --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 2003-2008, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This utility application creates symbol files in a format that is

--  platform-dependent.

--  A symbol file is a text file that lists the symbols to be exported from

--  a shared library. The format of a symbol file depends on the platform;

--  it may be a simple enumeration of the symbol (one per line) or a more

--  elaborate format (on VMS, for example). A symbol file may be used as an

--  input to the platform linker when building a shared library.

--  This utility is not available on all platforms. It is currently supported

--  only on OpenVMS.

--  gnatsym takes as parameters:

--    - the name of the symbol file to create

--    - (optional) the policy to create the symbol file

--    - (optional) the name of the reference symbol file

--    - the names of one or more object files where the symbols are found

with Ada.Exceptions; use Ada.Exceptions;

with Ada.Text_IO;    use Ada.Text_IO;

with GNAT.Command_Line; use GNAT.Command_Line;

with GNAT.OS_Lib;       use GNAT.OS_Lib;

with Gnatvsn; use Gnatvsn;

with Osint;   use Osint;

with Output;  use Output;

with Symbols; use Symbols;

with Table;

procedure Gnatsym is

   Empty_String : aliased String := "";

   Empty        : constant String_Access := Empty_String'Unchecked_Access;

   --  To initialize variables Reference and Version_String

   Copyright_Displayed : Boolean := False;

   --  A flag to prevent multiple display of the Copyright notice

   Success : Boolean := True;

   Symbol_Policy : Policy := Autonomous;

   Verbose : Boolean := False;

   --  True when -v switch is used

   Quiet : Boolean := False;

   --  True when -q switch is used

   Symbol_File_Name : String_Access := null;

   --  The name of the symbol file

   Reference_Symbol_File_Name : String_Access := Empty;

   --  The name of the reference symbol file

   Version_String : String_Access := Empty;

   --  The version of the library (used on VMS)

   package Object_Files is new Table.Table

     (Table_Component_Type => String_Access,

      Table_Index_Type     => Natural,

      Table_Low_Bound      => 0,

      Table_Initial        => 10,

      Table_Increment      => 100,

      Table_Name           => "Gnatsymb.Object_Files");

   --  A table to store the object file names

   Object_File : Natural := 0;

   --  An index to traverse the Object_Files table

   procedure Display_Copyright;

   --  Display Copyright notice

   procedure Parse_Cmd_Line;

   --  Parse the command line switches and file names

   procedure Usage;

   --  Display the usage

   -----------------------

   -- Display_Copyright --

   -----------------------

   procedure Display_Copyright is

   begin

      if not Copyright_Displayed then

         Write_Eol;

         Write_Str ("GNATSYMB ");

         Write_Str (Gnat_Version_String);

         Write_Eol;

         Write_Str ("Copyright 2003-2004 Free Software Foundation, Inc");

         Write_Eol;

         Copyright_Displayed := True;

      end if;

   end Display_Copyright;

   --------------------

   -- Parse_Cmd_Line --

   --------------------

   procedure Parse_Cmd_Line is

   begin

      loop

         case GNAT.Command_Line.Getopt ("c C D q r: R s: v V:") is

            when ASCII.NUL =>

               exit;

            when 'c' =>

               Symbol_Policy := Compliant;

            when 'C' =>

               Symbol_Policy := Controlled;

            when 'D' =>

               Symbol_Policy := Direct;

            when 'q' =>

               Quiet := True;

            when 'r' =>

               Reference_Symbol_File_Name :=

                 new String'(GNAT.Command_Line.Parameter);

            when 'R' =>

               Symbol_Policy := Restricted;

            when 's' =>

               Symbol_File_Name := new String'(GNAT.Command_Line.Parameter);

            when 'v' =>

               Verbose := True;

            when 'V' =>

               Version_String := new String'(GNAT.Command_Line.Parameter);

            when others =>

               Fail ("invalid switch: " & Full_Switch);

         end case;

      end loop;

      --  Get the file names

      loop

         declare

            S : constant String_Access :=

                           new String'(GNAT.Command_Line.Get_Argument);

         begin

            exit when S'Length = 0;

            Object_Files.Increment_Last;

            Object_Files.Table (Object_Files.Last) := S;

         end;

      end loop;

   exception

      when Invalid_Switch =>

         Usage;

         Fail ("invalid switch : " & Full_Switch);

   end Parse_Cmd_Line;

   -----------

   -- Usage --

   -----------

   procedure Usage is

   begin

      Write_Line ("gnatsym [options] object_file {object_file}");

      Write_Eol;

      Write_Line ("   -c       Compliant symbol policy");

      Write_Line ("   -C       Controlled symbol policy");

      Write_Line ("   -q       Quiet mode");

      Write_Line ("   -r<ref>  Reference symbol file name");

      Write_Line ("   -R       Restricted symbol policy");

      Write_Line ("   -s<sym>  Symbol file name");

      Write_Line ("   -v       Verbose mode");

      Write_Line ("   -V<ver>  Version");

      Write_Eol;

      Write_Line ("Specifying a symbol file with -s<sym> is compulsory");

      Write_Eol;

   end Usage;

--  Start of processing of Gnatsym

begin

   --  Initialize Object_Files table

   Object_Files.Set_Last (0);

   --  Parse the command line

   Parse_Cmd_Line;

   if Verbose then

      Display_Copyright;

   end if;

   --  If there is no symbol file or no object files on the command line,

   --  display the usage and exit with an error status.

   if Symbol_File_Name = null or else Object_Files.Last = 0 then

      Usage;

      OS_Exit (1);

   --  When symbol policy is direct, simply copy the reference symbol file to

   --  the symbol file.

   elsif Symbol_Policy = Direct then

      declare

         File_In  : Ada.Text_IO.File_Type;

         File_Out : Ada.Text_IO.File_Type;

         Line     : String (1 .. 1_000);

         Last     : Natural;

      begin

         begin

            Open (File_In, In_File, Reference_Symbol_File_Name.all);

         exception

            when X : others =>

               if not Quiet then

                  Put_Line

                    ("could not open """ &

                     Reference_Symbol_File_Name.all

                     & """");

                  Put_Line (Exception_Message (X));

               end if;

               OS_Exit (1);

         end;

         begin

            Create (File_Out, Out_File, Symbol_File_Name.all);

         exception

            when X : others =>

               if not Quiet then

                  Put_Line

                    ("could not create """ & Symbol_File_Name.all & """");

                  Put_Line (Exception_Message (X));

               end if;

               OS_Exit (1);

         end;

         while not End_Of_File (File_In) loop

            Get_Line (File_In, Line, Last);

            Put_Line (File_Out, Line (1 .. Last));

         end loop;

         Close (File_In);

         Close (File_Out);

      end;

   else

      if Verbose then

         Write_Str ("Initializing symbol file """);

         Write_Str (Symbol_File_Name.all);

         Write_Line ("""");

      end if;

      --  Initialize symbol file and, if specified, read reference file

      Symbols.Initialize

        (Symbol_File   => Symbol_File_Name.all,

         Reference     => Reference_Symbol_File_Name.all,

         Symbol_Policy => Symbol_Policy,

         Quiet         => Quiet,

         Version       => Version_String.all,

         Success       => Success);

      --  Process the object files in order. Stop as soon as there is

      --  something wrong.

      Object_File := 0;

      while Success and then Object_File < Object_Files.Last loop

         Object_File := Object_File + 1;

         if Verbose then

            Write_Str ("Processing object file """);

            Write_Str (Object_Files.Table (Object_File).all);

            Write_Line ("""");

         end if;

         Processing.Process (Object_Files.Table (Object_File).all, Success);

      end loop;

      --  Finalize the object file

      if Success then

         if Verbose then

            Write_Str ("Finalizing """);

            Write_Str (Symbol_File_Name.all);

            Write_Line ("""");

         end if;

         Finalize (Quiet, Success);

      end if;

      --  Fail if there was anything wrong

      if not Success then

         Fail ("unable to build symbol file");

      end if;

   end if;

end Gnatsym;