gcc/java/jvgenmain.c

   1 /* Program to generate "main" a Java(TM) class containing a main method.
   2    Copyright (C) 1998-2015 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.
  19
  20 Java and all Java-based marks are trademarks or registered trademarks
  21 of Sun Microsystems, Inc. in the United States and other countries.
  22 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  23
  24 /* Written by Per Bothner <bothner@cygnus.com> */
  25
  26 #include "config.h"
  27 #include "system.h"
  28 #include "coretypes.h"
  29 #include "obstack.h"
  30 #include "jcf.h"
  31 #include "alias.h"
  32 #include "tree.h"
  33 #include "options.h"
  34 #include "java-tree.h"
  35 #include "intl.h"
  36 #include "diagnostic.h"
  37
  38 static char * do_mangle_classname (const char *string);
  39
  40 struct obstack  name_obstack;
  41 struct obstack *mangle_obstack = &name_obstack;
  42
  43 static void usage (const char *) ATTRIBUTE_NORETURN;
  44
  45 static void
  46 usage (const char *name)
  47 {
  48   fprintf (stderr, _("Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n"),
  49            name);
  50   exit (1);
  51 }
  52
  53 int
  54 main (int argc, char **argv)
  55 {
  56   char *classname, *p;
  57   FILE *stream;
  58   const char *mangled_classname;
  59   int i, last_arg;
  60   int indirect = 0;
  61   char *prog_name = argv[0];
  62
  63   p = argv[0] + strlen (argv[0]);
  64   while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
  65     --p;
  66   progname = p;
  67
  68   xmalloc_set_program_name (progname);
  69
  70   /* Unlock the stdio streams.  */
  71   unlock_std_streams ();
  72
  73   gcc_init_libintl ();
  74
  75   diagnostic_initialize (global_dc, 0);
  76
  77   if (argc > 1 && ! strcmp (argv[1], "-findirect-dispatch"))
  78     {
  79       indirect = 1;
  80       ++argv;
  81       --argc;
  82     }
  83
  84   if (argc < 2)
  85     usage (prog_name);
  86
  87   for (i = 1; i < argc; ++i)
  88     {
  89       if (! strncmp (argv[i], "-D", 2))
  90         {
  91           /* Handled later.  Check "-D XXX=YYY".  */
  92           if (argv[i][2] == '\0')
  93             i++;
  94         }
  95       else
  96         break;
  97     }
  98
  99   if (i < argc - 2 || i == argc)
 100     usage (prog_name);
 101   last_arg = i;
 102
 103   classname = argv[i];
 104
 105   /* gcj always appends `main' to classname.  We need to strip this here.  */
 106   p = strrchr (classname, 'm');
 107   if (p == NULL || p == classname || strcmp (p, "main") != 0)
 108     usage (prog_name);
 109   else
 110     *p = '\0';
 111
 112   gcc_obstack_init (mangle_obstack);
 113   mangled_classname = do_mangle_classname (classname);
 114
 115   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 116     {
 117       const char *outfile = argv[i + 1];
 118       stream = fopen (outfile, "w");
 119       if (stream == NULL)
 120         {
 121           fprintf (stderr, _("%s: Cannot open output file: %s\n"),
 122                    prog_name, outfile);
 123           exit (1);
 124         }
 125     }
 126   else
 127     stream = stdout;
 128
 129   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 130      option.  Process them appropriately.  */
 131   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 132   if (indirect)
 133     fprintf (stream, "extern void JvRunMainName ();\n");
 134   else
 135     fprintf (stream, "extern void JvRunMain ();\n");
 136   fprintf (stream, "static const char *props[] =\n{\n");
 137   for (i = 1; i < last_arg; ++i)
 138     {
 139       const char *p;
 140
 141       if (strcmp (argv[i], "-D") == 0)
 142         continue;
 143
 144       fprintf (stream, "  \"");
 145       for (p = argv[i]; *p; ++p)
 146         {
 147           if (! ISPRINT (*p))
 148             fprintf (stream, "\\%o", *p);
 149           else if (*p == '\\' || *p == '"')
 150             fprintf (stream, "\\%c", *p);
 151           else
 152             putc (*p, stream);
 153         }
 154       fprintf (stream, "\",\n");
 155     }
 156   fprintf (stream, "  0\n};\n\n");
 157
 158   fprintf (stream, "int main (int argc, const char **argv)\n");
 159   fprintf (stream, "{\n");
 160   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 161   if (indirect)
 162     fprintf (stream, "   JvRunMainName (\"%s\", argc, argv);\n", classname);
 163   else
 164     {
 165       fprintf (stream, "   extern char %s;\n", mangled_classname);
 166       fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 167     }
 168   fprintf (stream, "}\n");
 169   if (stream != stdout && fclose (stream) != 0)
 170     {
 171       fprintf (stderr, _("%s: Failed to close output file %s\n"),
 172                prog_name, argv[2]);
 173       exit (1);
 174     }
 175   return 0;
 176 }
 177
 178
 179 static char *
 180 do_mangle_classname (const char *string)
 181 {
 182   const char *ptr;
 183   int count = 0;
 184
 185   obstack_grow (&name_obstack, "_ZN", 3);
 186
 187   for (ptr = string; *ptr; ptr++ )
 188     {
 189       if (*ptr == '.')
 190         {
 191           append_gpp_mangled_name (ptr - count, count);
 192           count = 0;
 193         }
 194       else
 195         count++;
 196     }
 197   append_gpp_mangled_name (&ptr [-count], count);
 198   obstack_grow (mangle_obstack, "6class$E", strlen ("6class$E"));
 199   obstack_1grow (mangle_obstack, '\0');
 200   return XOBFINISH (mangle_obstack, char *);
 201 }