/* Program to generate "main" a Java(TM) class containing a main method.
   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   2007, 2008, 2010, 2011 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT 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
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>. 

Java and all Java-based marks are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries.
The Free Software Foundation is independent of Sun Microsystems, Inc.  */

/* Written by Per Bothner <bothner@cygnus.com> */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "obstack.h"
#include "jcf.h"
#include "tree.h"
#include "java-tree.h"
#include "intl.h"
#include "diagnostic.h"

static char * do_mangle_classname (const char *string);

struct obstack  name_obstack;
struct obstack *mangle_obstack = &name_obstack;

static void usage (const char *) ATTRIBUTE_NORETURN;

static void
usage (const char *name)
{
  fprintf (stderr, _("Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n"),
	   name);
  exit (1);
}

int
main (int argc, char **argv)
{
  char *classname, *p;
  FILE *stream;
  const char *mangled_classname;
  int i, last_arg;
  int indirect = 0;
  char *prog_name = argv[0];

  p = argv[0] + strlen (argv[0]);
  while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
    --p;
  progname = p;

  xmalloc_set_program_name (progname);

  /* Unlock the stdio streams.  */
  unlock_std_streams ();

  gcc_init_libintl ();

  diagnostic_initialize (global_dc, 0);

  if (argc > 1 && ! strcmp (argv[1], "-findirect-dispatch"))
    {
      indirect = 1;
      ++argv;
      --argc;
    }

  if (argc < 2)
    usage (prog_name);

  for (i = 1; i < argc; ++i)
    {
      if (! strncmp (argv[i], "-D", 2))
	{
	  /* Handled later.  Check "-D XXX=YYY".  */
	  if (argv[i][2] == '\0')
	    i++;
	}
      else
	break;
    }

  if (i < argc - 2 || i == argc)
    usage (prog_name);
  last_arg = i;

  classname = argv[i];

  /* gcj always appends `main' to classname.  We need to strip this here.  */
  p = strrchr (classname, 'm');
  if (p == NULL || p == classname || strcmp (p, "main") != 0)
    usage (prog_name);
  else
    *p = '\0';

  gcc_obstack_init (mangle_obstack);
  mangled_classname = do_mangle_classname (classname);

  if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
    {
      const char *outfile = argv[i + 1];
      stream = fopen (outfile, "w");
      if (stream == NULL)
	{
	  fprintf (stderr, _("%s: Cannot open output file: %s\n"),
		   prog_name, outfile);
	  exit (1);
	}
    }
  else
    stream = stdout;

  /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
     option.  Process them appropriately.  */
  fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
  fprintf (stream, "static const char *props[] =\n{\n");
  for (i = 1; i < last_arg; ++i)
    {
      const char *p;

      if (strcmp (argv[i], "-D") == 0)
	continue;

      fprintf (stream, "  \"");
      for (p = argv[i]; *p; ++p)
	{
	  if (! ISPRINT (*p))
	    fprintf (stream, "\\%o", *p);
	  else if (*p == '\\' || *p == '"')
	    fprintf (stream, "\\%c", *p);
	  else
	    putc (*p, stream);
	}
      fprintf (stream, "\",\n");
    }
  fprintf (stream, "  0\n};\n\n");

  fprintf (stream, "int main (int argc, const char **argv)\n");
  fprintf (stream, "{\n");
  fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
  if (indirect)
    fprintf (stream, "   JvRunMainName (\"%s\", argc, argv);\n", classname);
  else
    {
      fprintf (stream, "   extern char %s;\n", mangled_classname);
      fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
    }
  fprintf (stream, "}\n");
  if (stream != stdout && fclose (stream) != 0)
    {
      fprintf (stderr, _("%s: Failed to close output file %s\n"),
	       prog_name, argv[2]);
      exit (1);
    }
  return 0;
}


static char *
do_mangle_classname (const char *string)
{
  const char *ptr;
  int count = 0;

  obstack_grow (&name_obstack, "_ZN", 3);

  for (ptr = string; *ptr; ptr++ )
    {
      if (*ptr == '.')
	{
	  append_gpp_mangled_name (ptr - count, count);
	  count = 0;
	}
      else
	count++;
    }
  append_gpp_mangled_name (&ptr [-count], count);
  obstack_grow (mangle_obstack, "6class$E", strlen ("6class$E"));
  obstack_1grow (mangle_obstack, '\0');
  return XOBFINISH (mangle_obstack, char *);
}