gcc/java/jvgenmain.c

/* Program to generate "main" a Java(TM) class containing a main method.
   Copyright (C) 1998-2013 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 *);
}