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
   3    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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.
  21
  22 Java and all Java-based marks are trademarks or registered trademarks
  23 of Sun Microsystems, Inc. in the United States and other countries.
  24 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  25
  26 /* Written by Per Bothner <bothner@cygnus.com> */
  27
  28 #include "config.h"
  29 #include "system.h"
  30 #include "coretypes.h"
  31 #include "tm.h"
  32 #include "obstack.h"
  33 #include "jcf.h"
  34 #include "tree.h"
  35 #include "java-tree.h"
  36 #include "intl.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
  61   gcc_init_libintl ();
  62
  63   if (argc < 2)
  64     usage (argv[0]);
  65
  66   for (i = 1; i < argc; ++i)
  67     {
  68       if (! strncmp (argv[i], "-D", 2))
  69         {
  70           /* Handled later.  */
  71         }
  72       else
  73         break;
  74     }
  75
  76   if (i < argc - 2 || i == argc)
  77     usage (argv[0]);
  78   last_arg = i;
  79
  80   classname = argv[i];
  81
  82   /* gcj always appends `main' to classname.  We need to strip this here.  */
  83   p = strrchr (classname, 'm');
  84   if (p == NULL || p == classname || strcmp (p, "main") != 0)
  85     usage (argv[0]);
  86   else
  87     *p = '\0';
  88
  89   gcc_obstack_init (mangle_obstack);
  90   mangled_classname = do_mangle_classname (classname);
  91
  92   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
  93     {
  94       const char *outfile = argv[i + 1];
  95       stream = fopen (outfile, "w");
  96       if (stream == NULL)
  97         {
  98           fprintf (stderr, _("%s: Cannot open output file: %s\n"),
  99                    argv[0], outfile);
 100           exit (1);
 101         }
 102     }
 103   else
 104     stream = stdout;
 105
 106   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 107      option.  Process them appropriately.  */
 108   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 109   fprintf (stream, "static const char *props[] =\n{\n");
 110   for (i = 1; i < last_arg; ++i)
 111     {
 112       const char *p;
 113       fprintf (stream, "  \"");
 114       for (p = &argv[i][2]; *p; ++p)
 115         {
 116           if (! ISPRINT (*p))
 117             fprintf (stream, "\\%o", *p);
 118           else if (*p == '\\' || *p == '"')
 119             fprintf (stream, "\\%c", *p);
 120           else
 121             putc (*p, stream);
 122         }
 123       fprintf (stream, "\",\n");
 124     }
 125   fprintf (stream, "  0\n};\n\n");
 126
 127   fprintf (stream, "extern int %s;\n", mangled_classname);
 128   fprintf (stream, "int main (int argc, const char **argv)\n");
 129   fprintf (stream, "{\n");
 130   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 131   fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 132   fprintf (stream, "}\n");
 133   if (stream != stdout && fclose (stream) != 0)
 134     {
 135       fprintf (stderr, _("%s: Failed to close output file %s\n"),
 136                argv[0], argv[2]);
 137       exit (1);
 138     }
 139   return 0;
 140 }
 141
 142
 143 static char *
 144 do_mangle_classname (const char *string)
 145 {
 146   const char *ptr;
 147   int count = 0;
 148
 149   obstack_grow (&name_obstack, "_ZN", 3);
 150
 151   for (ptr = string; *ptr; ptr++ )
 152     {
 153       if (ptr[0] == '.')
 154         {
 155           append_gpp_mangled_name (&ptr [-count], count);
 156           count = 0;
 157         }
 158       else
 159         count++;
 160     }
 161   append_gpp_mangled_name (&ptr [-count], count);
 162   obstack_grow (mangle_obstack, "6class$E", 8);
 163   obstack_1grow (mangle_obstack, '\0');
 164   return obstack_finish (mangle_obstack);
 165 }