gcc/java/jvgenmain.c

   1 /* Program to generate "main" a Java(TM) class containing a main method.
   2    Copyright (C) 1998-2014 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 "tree.h"
  32 #include "java-tree.h"
  33 #include "intl.h"
  34 #include "diagnostic.h"
  35
  36 static char * do_mangle_classname (const char *string);
  37
  38 struct obstack  name_obstack;
  39 struct obstack *mangle_obstack = &name_obstack;
  40
  41 static void usage (const char *) ATTRIBUTE_NORETURN;
  42
  43 static void
  44 usage (const char *name)
  45 {
  46   fprintf (stderr, _("Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n"),
  47            name);
  48   exit (1);
  49 }
  50
  51 int
  52 main (int argc, char **argv)
  53 {
  54   char *classname, *p;
  55   FILE *stream;
  56   const char *mangled_classname;
  57   int i, last_arg;
  58   int indirect = 0;
  59   char *prog_name = argv[0];
  60
  61   p = argv[0] + strlen (argv[0]);
  62   while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
  63     --p;
  64   progname = p;
  65
  66   xmalloc_set_program_name (progname);
  67
  68   /* Unlock the stdio streams.  */
  69   unlock_std_streams ();
  70
  71   gcc_init_libintl ();
  72
  73   diagnostic_initialize (global_dc, 0);
  74
  75   if (argc > 1 && ! strcmp (argv[1], "-findirect-dispatch"))
  76     {
  77       indirect = 1;
  78       ++argv;
  79       --argc;
  80     }
  81
  82   if (argc < 2)
  83     usage (prog_name);
  84
  85   for (i = 1; i < argc; ++i)
  86     {
  87       if (! strncmp (argv[i], "-D", 2))
  88         {
  89           /* Handled later.  Check "-D XXX=YYY".  */
  90           if (argv[i][2] == '\0')
  91             i++;
  92         }
  93       else
  94         break;
  95     }
  96
  97   if (i < argc - 2 || i == argc)
  98     usage (prog_name);
  99   last_arg = i;
 100
 101   classname = argv[i];
 102
 103   /* gcj always appends `main' to classname.  We need to strip this here.  */
 104   p = strrchr (classname, 'm');
 105   if (p == NULL || p == classname || strcmp (p, "main") != 0)
 106     usage (prog_name);
 107   else
 108     *p = '\0';
 109
 110   gcc_obstack_init (mangle_obstack);
 111   mangled_classname = do_mangle_classname (classname);
 112
 113   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 114     {
 115       const char *outfile = argv[i + 1];
 116       stream = fopen (outfile, "w");
 117       if (stream == NULL)
 118         {
 119           fprintf (stderr, _("%s: Cannot open output file: %s\n"),
 120                    prog_name, outfile);
 121           exit (1);
 122         }
 123     }
 124   else
 125     stream = stdout;
 126
 127   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 128      option.  Process them appropriately.  */
 129   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 130   if (indirect)
 131     fprintf (stream, "extern void JvRunMainName ();\n");
 132   else
 133     fprintf (stream, "extern void JvRunMain ();\n");
 134   fprintf (stream, "static const char *props[] =\n{\n");
 135   for (i = 1; i < last_arg; ++i)
 136     {
 137       const char *p;
 138
 139       if (strcmp (argv[i], "-D") == 0)
 140         continue;
 141
 142       fprintf (stream, "  \"");
 143       for (p = argv[i]; *p; ++p)
 144         {
 145           if (! ISPRINT (*p))
 146             fprintf (stream, "\\%o", *p);
 147           else if (*p == '\\' || *p == '"')
 148             fprintf (stream, "\\%c", *p);
 149           else
 150             putc (*p, stream);
 151         }
 152       fprintf (stream, "\",\n");
 153     }
 154   fprintf (stream, "  0\n};\n\n");
 155
 156   fprintf (stream, "int main (int argc, const char **argv)\n");
 157   fprintf (stream, "{\n");
 158   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 159   if (indirect)
 160     fprintf (stream, "   JvRunMainName (\"%s\", argc, argv);\n", classname);
 161   else
 162     {
 163       fprintf (stream, "   extern char %s;\n", mangled_classname);
 164       fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 165     }
 166   fprintf (stream, "}\n");
 167   if (stream != stdout && fclose (stream) != 0)
 168     {
 169       fprintf (stderr, _("%s: Failed to close output file %s\n"),
 170                prog_name, argv[2]);
 171       exit (1);
 172     }
 173   return 0;
 174 }
 175
 176
 177 static char *
 178 do_mangle_classname (const char *string)
 179 {
 180   const char *ptr;
 181   int count = 0;
 182
 183   obstack_grow (&name_obstack, "_ZN", 3);
 184
 185   for (ptr = string; *ptr; ptr++ )
 186     {
 187       if (*ptr == '.')
 188         {
 189           append_gpp_mangled_name (ptr - count, count);
 190           count = 0;
 191         }
 192       else
 193         count++;
 194     }
 195   append_gpp_mangled_name (&ptr [-count], count);
 196   obstack_grow (mangle_obstack, "6class$E", strlen ("6class$E"));
 197   obstack_1grow (mangle_obstack, '\0');
 198   return XOBFINISH (mangle_obstack, char *);
 199 }