--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/gnatxref.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,338 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                             G N A T X R E F                              --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          Copyright (C) 1998-2017, 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Opt;
+with Osint;    use Osint;
+with Types;    use Types;
+with Switch;   use Switch;
+with Xr_Tabls;
+with Xref_Lib; use Xref_Lib;
+
+with Ada.Command_Line;  use Ada.Command_Line;
+with Ada.Strings.Fixed;
+with Ada.Text_IO;       use Ada.Text_IO;
+
+with GNAT.Command_Line; use GNAT.Command_Line;
+
+with System.Strings;    use System.Strings;
+
+procedure Gnatxref is
+   Search_Unused   : Boolean := False;
+   Local_Symbols   : Boolean := True;
+   Prj_File        : File_Name_String;
+   Prj_File_Length : Natural := 0;
+   Usage_Error     : exception;
+   Full_Path_Name  : Boolean := False;
+   Vi_Mode         : Boolean := False;
+   Read_Only       : Boolean := False;
+   Have_File       : Boolean := False;
+   Der_Info        : Boolean := False;
+
+   RTS_Specified : String_Access := null;
+   --  Used to detect multiple use of --RTS= switch
+
+   EXT_Specified : String_Access := null;
+   --  Used to detect multiple use of --ext= switch
+
+   procedure Parse_Cmd_Line;
+   --  Parse every switch on the command line
+
+   procedure Usage;
+   --  Display the usage
+
+   procedure Write_Usage;
+   --  Print a small help page for program usage
+
+   --------------------
+   -- Parse_Cmd_Line --
+   --------------------
+
+   procedure Parse_Cmd_Line is
+
+      procedure Check_Version_And_Help is new Check_Version_And_Help_G (Usage);
+
+      --  Start of processing for Parse_Cmd_Line
+
+   begin
+      --  First check for --version or --help
+
+      Check_Version_And_Help ("GNATXREF", "1998");
+
+      loop
+         case
+           GNAT.Command_Line.Getopt
+             ("a aI: aO: d f g h I: nostdinc nostdlib p: u v -RTS= -ext=")
+         is
+            when ASCII.NUL =>
+               exit;
+
+            when 'a' =>
+               if GNAT.Command_Line.Full_Switch = "a" then
+                  Read_Only := True;
+
+               elsif GNAT.Command_Line.Full_Switch = "aI" then
+                  Osint.Add_Src_Search_Dir (GNAT.Command_Line.Parameter);
+
+               else
+                  Osint.Add_Lib_Search_Dir (GNAT.Command_Line.Parameter);
+               end if;
+
+            when 'd' =>
+               Der_Info := True;
+
+            when 'f' =>
+               Full_Path_Name := True;
+
+            when 'g' =>
+               Local_Symbols := False;
+
+            when 'h' =>
+               Write_Usage;
+
+            when 'I' =>
+               Osint.Add_Src_Search_Dir (GNAT.Command_Line.Parameter);
+               Osint.Add_Lib_Search_Dir (GNAT.Command_Line.Parameter);
+
+            when 'n' =>
+               if GNAT.Command_Line.Full_Switch = "nostdinc" then
+                  Opt.No_Stdinc := True;
+               elsif GNAT.Command_Line.Full_Switch = "nostdlib" then
+                  Opt.No_Stdlib := True;
+               end if;
+
+            when 'p' =>
+               declare
+                  S : constant String := GNAT.Command_Line.Parameter;
+               begin
+                  Prj_File_Length := S'Length;
+                  Prj_File (1 .. Prj_File_Length) := S;
+               end;
+
+            when 'u' =>
+               Search_Unused := True;
+               Vi_Mode := False;
+
+            when 'v' =>
+               Vi_Mode := True;
+               Search_Unused := False;
+
+            --  The only switch starting with -- recognized is --RTS
+
+            when '-' =>
+
+               --  Check that it is the first time we see this switch
+
+               if Full_Switch = "-RTS" then
+                  if RTS_Specified = null then
+                     RTS_Specified := new String'(GNAT.Command_Line.Parameter);
+
+                  elsif RTS_Specified.all /= GNAT.Command_Line.Parameter then
+                     Osint.Fail ("--RTS cannot be specified multiple times");
+                  end if;
+
+                  Opt.No_Stdinc  := True;
+                  Opt.RTS_Switch := True;
+
+                  declare
+                     Src_Path_Name : constant String_Ptr :=
+                                       Get_RTS_Search_Dir
+                                         (GNAT.Command_Line.Parameter,
+                                          Include);
+
+                     Lib_Path_Name : constant String_Ptr :=
+                                       Get_RTS_Search_Dir
+                                         (GNAT.Command_Line.Parameter,
+                                          Objects);
+
+                  begin
+                     if Src_Path_Name /= null
+                       and then Lib_Path_Name /= null
+                     then
+                        Add_Search_Dirs (Src_Path_Name, Include);
+                        Add_Search_Dirs (Lib_Path_Name, Objects);
+
+                     elsif Src_Path_Name = null
+                       and then Lib_Path_Name = null
+                     then
+                        Osint.Fail
+                          ("RTS path not valid: missing adainclude and "
+                           & "adalib directories");
+
+                     elsif Src_Path_Name = null then
+                        Osint.Fail
+                          ("RTS path not valid: missing adainclude directory");
+
+                     elsif Lib_Path_Name = null then
+                        Osint.Fail
+                          ("RTS path not valid: missing adalib directory");
+                     end if;
+                  end;
+
+               elsif GNAT.Command_Line.Full_Switch = "-ext" then
+
+                  --  Check that it is the first time we see this switch
+
+                  if EXT_Specified = null then
+                     EXT_Specified := new String'(GNAT.Command_Line.Parameter);
+
+                  elsif EXT_Specified.all /= GNAT.Command_Line.Parameter then
+                     Osint.Fail ("--ext cannot be specified multiple times");
+                  end if;
+
+                  if EXT_Specified'Length = Osint.ALI_Default_Suffix'Length
+                  then
+                     Osint.ALI_Suffix := EXT_Specified.all'Access;
+                  else
+                     Osint.Fail ("--ext argument must have 3 characters");
+                  end if;
+               end if;
+
+            when others =>
+               Try_Help;
+               raise Usage_Error;
+         end case;
+      end loop;
+
+      --  Get the other arguments
+
+      loop
+         declare
+            S : constant String := GNAT.Command_Line.Get_Argument;
+
+         begin
+            exit when S'Length = 0;
+
+            if Ada.Strings.Fixed.Index (S, ":") /= 0 then
+               Ada.Text_IO.Put_Line
+                 ("Only file names are allowed on the command line");
+               Try_Help;
+               raise Usage_Error;
+            end if;
+
+            Add_Xref_File (S);
+            Have_File := True;
+         end;
+      end loop;
+
+   exception
+      when GNAT.Command_Line.Invalid_Switch =>
+         Ada.Text_IO.Put_Line ("Invalid switch : "
+                               & GNAT.Command_Line.Full_Switch);
+         Try_Help;
+         raise Usage_Error;
+
+      when GNAT.Command_Line.Invalid_Parameter =>
+         Ada.Text_IO.Put_Line ("Parameter missing for : "
+                               & GNAT.Command_Line.Full_Switch);
+         Try_Help;
+         raise Usage_Error;
+   end Parse_Cmd_Line;
+
+   -----------
+   -- Usage --
+   -----------
+
+   procedure Usage is
+   begin
+      Put_Line ("Usage: gnatxref [switches] file1 file2 ...");
+      New_Line;
+      Put_Line ("  file ... list of source files to xref, " &
+                "including with'ed units");
+      New_Line;
+      Put_Line ("gnatxref switches:");
+      Display_Usage_Version_And_Help;
+      Put_Line ("   -a        Consider all files, even when the ali file is"
+                & " readonly");
+      Put_Line ("   -aIdir    Specify source files search path");
+      Put_Line ("   -aOdir    Specify library/object files search path");
+      Put_Line ("   -d        Output derived type information");
+      Put_Line ("   -f        Output full path name");
+      Put_Line ("   -g        Output information only for global symbols");
+      Put_Line ("   -Idir     Like -aIdir -aOdir");
+      Put_Line ("   -nostdinc Don't look for sources in the system default"
+                & " directory");
+      Put_Line ("   -nostdlib Don't look for library files in the system"
+                & " default directory");
+      Put_Line ("   --ext=xxx Specify alternate ali file extension");
+      Put_Line ("   --RTS=dir specify the default source and object search"
+                & " path");
+      Put_Line ("   -p file   Use file as the configuration file");
+      Put_Line ("   -u        List unused entities");
+      Put_Line ("   -v        Print a 'tags' file for vi");
+      New_Line;
+
+   end Usage;
+
+   -----------------
+   -- Write_Usage --
+   -----------------
+
+   procedure Write_Usage is
+   begin
+      Display_Version ("GNATXREF", "1998");
+      New_Line;
+      Usage;
+      raise Usage_Error;
+   end Write_Usage;
+
+begin
+   Parse_Cmd_Line;
+
+   if not Have_File then
+      if Argument_Count = 0 then
+         Write_Usage;
+      else
+         Try_Help;
+         raise Usage_Error;
+      end if;
+   end if;
+
+   Xr_Tabls.Set_Default_Match (True);
+
+   --  Find the project file
+
+   if Prj_File_Length = 0 then
+      Xr_Tabls.Create_Project_File
+        (Default_Project_File (Osint.To_Host_Dir_Spec (".", False).all));
+   else
+      Xr_Tabls.Create_Project_File (Prj_File (1 .. Prj_File_Length));
+   end if;
+
+   --  Fill up the table
+
+   Search_Xref (Local_Symbols, Read_Only, Der_Info);
+
+   if Search_Unused then
+      Print_Unused (Full_Path_Name);
+   elsif Vi_Mode then
+      Print_Vi (Full_Path_Name);
+   else
+      Print_Xref (Full_Path_Name);
+   end if;
+
+exception
+   when Usage_Error =>
+      null;
+end Gnatxref;