gcc/java/jvgenmain.c

   1 /* Program to generate "main" a Java(TM) class containing a main method.
   2    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   3    2007 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.
  20
  21 Java and all Java-based marks are trademarks or registered trademarks
  22 of Sun Microsystems, Inc. in the United States and other countries.
  23 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  24
  25 /* Written by Per Bothner <bothner@cygnus.com> */
  26
  27 #include "config.h"
  28 #include "system.h"
  29 #include "coretypes.h"
  30 #include "tm.h"
  31 #include "obstack.h"
  32 #include "jcf.h"
  33 #include "tree.h"
  34 #include "java-tree.h"
  35 #include "intl.h"
  36
  37 static char * do_mangle_classname (const char *string);
  38
  39 struct obstack  name_obstack;
  40 struct obstack *mangle_obstack = &name_obstack;
  41
  42 static void usage (const char *) ATTRIBUTE_NORETURN;
  43
  44 static void
  45 usage (const char *name)
  46 {
  47   fprintf (stderr, _("Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n"),
  48            name);
  49   exit (1);
  50 }
  51
  52 int
  53 main (int argc, char **argv)
  54 {
  55   char *classname, *p;
  56   FILE *stream;
  57   const char *mangled_classname;
  58   int i, last_arg;
  59   int indirect = 0;
  60   char *prog_name = argv[0];
  61
  62   /* Unlock the stdio streams.  */
  63   unlock_std_streams ();
  64
  65   gcc_init_libintl ();
  66
  67   if (argc > 1 && ! strcmp (argv[1], "-findirect-dispatch"))
  68     {
  69       indirect = 1;
  70       ++argv;
  71       --argc;
  72     }
  73
  74   if (argc < 2)
  75     usage (prog_name);
  76
  77   for (i = 1; i < argc; ++i)
  78     {
  79       if (! strncmp (argv[i], "-D", 2))
  80         {
  81           /* Handled later.  */
  82         }
  83       else
  84         break;
  85     }
  86
  87   if (i < argc - 2 || i == argc)
  88     usage (prog_name);
  89   last_arg = i;
  90
  91   classname = argv[i];
  92
  93   /* gcj always appends `main' to classname.  We need to strip this here.  */
  94   p = strrchr (classname, 'm');
  95   if (p == NULL || p == classname || strcmp (p, "main") != 0)
  96     usage (prog_name);
  97   else
  98     *p = '\0';
  99
 100   gcc_obstack_init (mangle_obstack);
 101   mangled_classname = do_mangle_classname (classname);
 102
 103   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 104     {
 105       const char *outfile = argv[i + 1];
 106       stream = fopen (outfile, "w");
 107       if (stream == NULL)
 108         {
 109           fprintf (stderr, _("%s: Cannot open output file: %s\n"),
 110                    prog_name, outfile);
 111           exit (1);
 112         }
 113     }
 114   else
 115     stream = stdout;
 116
 117   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 118      option.  Process them appropriately.  */
 119   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 120   fprintf (stream, "static const char *props[] =\n{\n");
 121   for (i = 1; i < last_arg; ++i)
 122     {
 123       const char *p;
 124       fprintf (stream, "  \"");
 125       for (p = &argv[i][2]; *p; ++p)
 126         {
 127           if (! ISPRINT (*p))
 128             fprintf (stream, "\\%o", *p);
 129           else if (*p == '\\' || *p == '"')
 130             fprintf (stream, "\\%c", *p);
 131           else
 132             putc (*p, stream);
 133         }
 134       fprintf (stream, "\",\n");
 135     }
 136   fprintf (stream, "  0\n};\n\n");
 137
 138   fprintf (stream, "int main (int argc, const char **argv)\n");
 139   fprintf (stream, "{\n");
 140   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 141   if (indirect)
 142     fprintf (stream, "   JvRunMainName (\"%s\", argc, argv);\n", classname);
 143   else
 144     {
 145       fprintf (stream, "   extern char %s;\n", mangled_classname);
 146       fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 147     }
 148   fprintf (stream, "}\n");
 149   if (stream != stdout && fclose (stream) != 0)
 150     {
 151       fprintf (stderr, _("%s: Failed to close output file %s\n"),
 152                prog_name, argv[2]);
 153       exit (1);
 154     }
 155   return 0;
 156 }
 157
 158
 159 static char *
 160 do_mangle_classname (const char *string)
 161 {
 162   const char *ptr;
 163   int count = 0;
 164
 165   obstack_grow (&name_obstack, "_ZN", 3);
 166
 167   for (ptr = string; *ptr; ptr++ )
 168     {
 169       if (*ptr == '.')
 170         {
 171           append_gpp_mangled_name (ptr - count, count);
 172           count = 0;
 173         }
 174       else
 175         count++;
 176     }
 177   append_gpp_mangled_name (&ptr [-count], count);
 178   obstack_grow (mangle_obstack, "6class$E", strlen ("6class$E"));
 179   obstack_1grow (mangle_obstack, '\0');
 180   return obstack_finish (mangle_obstack);
 181 }