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, 2008, 2010, 2011 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 "obstack.h"
  31 #include "jcf.h"
  32 #include "tree.h"
  33 #include "java-tree.h"
  34 #include "intl.h"
  35 #include "diagnostic.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   p = argv[0] + strlen (argv[0]);
  63   while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
  64     --p;
  65   progname = p;
  66
  67   xmalloc_set_program_name (progname);
  68
  69   /* Unlock the stdio streams.  */
  70   unlock_std_streams ();
  71
  72   gcc_init_libintl ();
  73
  74   diagnostic_initialize (global_dc, 0);
  75
  76   if (argc > 1 && ! strcmp (argv[1], "-findirect-dispatch"))
  77     {
  78       indirect = 1;
  79       ++argv;
  80       --argc;
  81     }
  82
  83   if (argc < 2)
  84     usage (prog_name);
  85
  86   for (i = 1; i < argc; ++i)
  87     {
  88       if (! strncmp (argv[i], "-D", 2))
  89         {
  90           /* Handled later.  Check "-D XXX=YYY".  */
  91           if (argv[i][2] == '\0')
  92             i++;
  93         }
  94       else
  95         break;
  96     }
  97
  98   if (i < argc - 2 || i == argc)
  99     usage (prog_name);
 100   last_arg = i;
 101
 102   classname = argv[i];
 103
 104   /* gcj always appends `main' to classname.  We need to strip this here.  */
 105   p = strrchr (classname, 'm');
 106   if (p == NULL || p == classname || strcmp (p, "main") != 0)
 107     usage (prog_name);
 108   else
 109     *p = '\0';
 110
 111   gcc_obstack_init (mangle_obstack);
 112   mangled_classname = do_mangle_classname (classname);
 113
 114   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 115     {
 116       const char *outfile = argv[i + 1];
 117       stream = fopen (outfile, "w");
 118       if (stream == NULL)
 119         {
 120           fprintf (stderr, _("%s: Cannot open output file: %s\n"),
 121                    prog_name, outfile);
 122           exit (1);
 123         }
 124     }
 125   else
 126     stream = stdout;
 127
 128   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 129      option.  Process them appropriately.  */
 130   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 131   fprintf (stream, "static const char *props[] =\n{\n");
 132   for (i = 1; i < last_arg; ++i)
 133     {
 134       const char *p;
 135
 136       if (strcmp (argv[i], "-D") == 0)
 137         continue;
 138
 139       fprintf (stream, "  \"");
 140       for (p = argv[i]; *p; ++p)
 141         {
 142           if (! ISPRINT (*p))
 143             fprintf (stream, "\\%o", *p);
 144           else if (*p == '\\' || *p == '"')
 145             fprintf (stream, "\\%c", *p);
 146           else
 147             putc (*p, stream);
 148         }
 149       fprintf (stream, "\",\n");
 150     }
 151   fprintf (stream, "  0\n};\n\n");
 152
 153   fprintf (stream, "int main (int argc, const char **argv)\n");
 154   fprintf (stream, "{\n");
 155   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 156   if (indirect)
 157     fprintf (stream, "   JvRunMainName (\"%s\", argc, argv);\n", classname);
 158   else
 159     {
 160       fprintf (stream, "   extern char %s;\n", mangled_classname);
 161       fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 162     }
 163   fprintf (stream, "}\n");
 164   if (stream != stdout && fclose (stream) != 0)
 165     {
 166       fprintf (stderr, _("%s: Failed to close output file %s\n"),
 167                prog_name, argv[2]);
 168       exit (1);
 169     }
 170   return 0;
 171 }
 172
 173
 174 static char *
 175 do_mangle_classname (const char *string)
 176 {
 177   const char *ptr;
 178   int count = 0;
 179
 180   obstack_grow (&name_obstack, "_ZN", 3);
 181
 182   for (ptr = string; *ptr; ptr++ )
 183     {
 184       if (*ptr == '.')
 185         {
 186           append_gpp_mangled_name (ptr - count, count);
 187           count = 0;
 188         }
 189       else
 190         count++;
 191     }
 192   append_gpp_mangled_name (&ptr [-count], count);
 193   obstack_grow (mangle_obstack, "6class$E", strlen ("6class$E"));
 194   obstack_1grow (mangle_obstack, '\0');
 195   return XOBFINISH (mangle_obstack, char *);
 196 }