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 "symtab.h"
  33 #include "options.h"
  34 #include "tree.h"
  35 #include "java-tree.h"
  36 #include "intl.h"
  37 #include "diagnostic.h"
  38
  39 static char * do_mangle_classname (const char *string);
  40
  41 struct obstack  name_obstack;
  42 struct obstack *mangle_obstack = &name_obstack;
  43
  44 static void usage (const char *) ATTRIBUTE_NORETURN;
  45
  46 static void
  47 usage (const char *name)
  48 {
  49   fprintf (stderr, _("Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n"),
  50            name);
  51   exit (1);
  52 }
  53
  54 int
  55 main (int argc, char **argv)
  56 {
  57   char *classname, *p;
  58   FILE *stream;
  59   const char *mangled_classname;
  60   int i, last_arg;
  61   int indirect = 0;
  62   char *prog_name = argv[0];
  63
  64   p = argv[0] + strlen (argv[0]);
  65   while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
  66     --p;
  67   progname = p;
  68
  69   xmalloc_set_program_name (progname);
  70
  71   /* Unlock the stdio streams.  */
  72   unlock_std_streams ();
  73
  74   gcc_init_libintl ();
  75
  76   diagnostic_initialize (global_dc, 0);
  77
  78   if (argc > 1 && ! strcmp (argv[1], "-findirect-dispatch"))
  79     {
  80       indirect = 1;
  81       ++argv;
  82       --argc;
  83     }
  84
  85   if (argc < 2)
  86     usage (prog_name);
  87
  88   for (i = 1; i < argc; ++i)
  89     {
  90       if (! strncmp (argv[i], "-D", 2))
  91         {
  92           /* Handled later.  Check "-D XXX=YYY".  */
  93           if (argv[i][2] == '\0')
  94             i++;
  95         }
  96       else
  97         break;
  98     }
  99
 100   if (i < argc - 2 || i == argc)
 101     usage (prog_name);
 102   last_arg = i;
 103
 104   classname = argv[i];
 105
 106   /* gcj always appends `main' to classname.  We need to strip this here.  */
 107   p = strrchr (classname, 'm');
 108   if (p == NULL || p == classname || strcmp (p, "main") != 0)
 109     usage (prog_name);
 110   else
 111     *p = '\0';
 112
 113   gcc_obstack_init (mangle_obstack);
 114   mangled_classname = do_mangle_classname (classname);
 115
 116   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 117     {
 118       const char *outfile = argv[i + 1];
 119       stream = fopen (outfile, "w");
 120       if (stream == NULL)
 121         {
 122           fprintf (stderr, _("%s: Cannot open output file: %s\n"),
 123                    prog_name, outfile);
 124           exit (1);
 125         }
 126     }
 127   else
 128     stream = stdout;
 129
 130   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 131      option.  Process them appropriately.  */
 132   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 133   if (indirect)
 134     fprintf (stream, "extern void JvRunMainName ();\n");
 135   else
 136     fprintf (stream, "extern void JvRunMain ();\n");
 137   fprintf (stream, "static const char *props[] =\n{\n");
 138   for (i = 1; i < last_arg; ++i)
 139     {
 140       const char *p;
 141
 142       if (strcmp (argv[i], "-D") == 0)
 143         continue;
 144
 145       fprintf (stream, "  \"");
 146       for (p = argv[i]; *p; ++p)
 147         {
 148           if (! ISPRINT (*p))
 149             fprintf (stream, "\\%o", *p);
 150           else if (*p == '\\' || *p == '"')
 151             fprintf (stream, "\\%c", *p);
 152           else
 153             putc (*p, stream);
 154         }
 155       fprintf (stream, "\",\n");
 156     }
 157   fprintf (stream, "  0\n};\n\n");
 158
 159   fprintf (stream, "int main (int argc, const char **argv)\n");
 160   fprintf (stream, "{\n");
 161   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 162   if (indirect)
 163     fprintf (stream, "   JvRunMainName (\"%s\", argc, argv);\n", classname);
 164   else
 165     {
 166       fprintf (stream, "   extern char %s;\n", mangled_classname);
 167       fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 168     }
 169   fprintf (stream, "}\n");
 170   if (stream != stdout && fclose (stream) != 0)
 171     {
 172       fprintf (stderr, _("%s: Failed to close output file %s\n"),
 173                prog_name, argv[2]);
 174       exit (1);
 175     }
 176   return 0;
 177 }
 178
 179
 180 static char *
 181 do_mangle_classname (const char *string)
 182 {
 183   const char *ptr;
 184   int count = 0;
 185
 186   obstack_grow (&name_obstack, "_ZN", 3);
 187
 188   for (ptr = string; *ptr; ptr++ )
 189     {
 190       if (*ptr == '.')
 191         {
 192           append_gpp_mangled_name (ptr - count, count);
 193           count = 0;
 194         }
 195       else
 196         count++;
 197     }
 198   append_gpp_mangled_name (&ptr [-count], count);
 199   obstack_grow (mangle_obstack, "6class$E", strlen ("6class$E"));
 200   obstack_1grow (mangle_obstack, '\0');
 201   return XOBFINISH (mangle_obstack, char *);
 202 }