gcc/java/jvgenmain.c

   1 /* Program to generate "main" a Java(TM) class containing a main method.
   2    Copyright (C) 1998-2016 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 "tree.h"
  30 #include "diagnostic.h"
  31 #include "java-tree.h"
  32 #include "intl.h"
  33
  34 static char * do_mangle_classname (const char *string);
  35
  36 struct obstack  name_obstack;
  37 struct obstack *mangle_obstack = &name_obstack;
  38
  39 static void usage (const char *) ATTRIBUTE_NORETURN;
  40
  41 static void
  42 usage (const char *name)
  43 {
  44   fprintf (stderr, _("Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n"),
  45            name);
  46   exit (1);
  47 }
  48
  49 int
  50 main (int argc, char **argv)
  51 {
  52   char *classname, *p;
  53   FILE *stream;
  54   const char *mangled_classname;
  55   int i, last_arg;
  56   int indirect = 0;
  57   char *prog_name = argv[0];
  58
  59   p = argv[0] + strlen (argv[0]);
  60   while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
  61     --p;
  62   progname = p;
  63
  64   xmalloc_set_program_name (progname);
  65
  66   /* Unlock the stdio streams.  */
  67   unlock_std_streams ();
  68
  69   gcc_init_libintl ();
  70
  71   diagnostic_initialize (global_dc, 0);
  72
  73   if (argc > 1 && ! strcmp (argv[1], "-findirect-dispatch"))
  74     {
  75       indirect = 1;
  76       ++argv;
  77       --argc;
  78     }
  79
  80   if (argc < 2)
  81     usage (prog_name);
  82
  83   for (i = 1; i < argc; ++i)
  84     {
  85       if (! strncmp (argv[i], "-D", 2))
  86         {
  87           /* Handled later.  Check "-D XXX=YYY".  */
  88           if (argv[i][2] == '\0')
  89             i++;
  90         }
  91       else
  92         break;
  93     }
  94
  95   if (i < argc - 2 || i == argc)
  96     usage (prog_name);
  97   last_arg = i;
  98
  99   classname = argv[i];
 100
 101   /* gcj always appends `main' to classname.  We need to strip this here.  */
 102   p = strrchr (classname, 'm');
 103   if (p == NULL || p == classname || strcmp (p, "main") != 0)
 104     usage (prog_name);
 105   else
 106     *p = '\0';
 107
 108   gcc_obstack_init (mangle_obstack);
 109   mangled_classname = do_mangle_classname (classname);
 110
 111   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 112     {
 113       const char *outfile = argv[i + 1];
 114       stream = fopen (outfile, "w");
 115       if (stream == NULL)
 116         {
 117           fprintf (stderr, _("%s: Cannot open output file: %s\n"),
 118                    prog_name, outfile);
 119           exit (1);
 120         }
 121     }
 122   else
 123     stream = stdout;
 124
 125   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 126      option.  Process them appropriately.  */
 127   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 128   if (indirect)
 129     fprintf (stream, "extern void JvRunMainName ();\n");
 130   else
 131     fprintf (stream, "extern void JvRunMain ();\n");
 132   fprintf (stream, "static const char *props[] =\n{\n");
 133   for (i = 1; i < last_arg; ++i)
 134     {
 135       const char *p;
 136
 137       if (strcmp (argv[i], "-D") == 0)
 138         continue;
 139
 140       fprintf (stream, "  \"");
 141       for (p = argv[i]; *p; ++p)
 142         {
 143           if (! ISPRINT (*p))
 144             fprintf (stream, "\\%o", *p);
 145           else if (*p == '\\' || *p == '"')
 146             fprintf (stream, "\\%c", *p);
 147           else
 148             putc (*p, stream);
 149         }
 150       fprintf (stream, "\",\n");
 151     }
 152   fprintf (stream, "  0\n};\n\n");
 153
 154   fprintf (stream, "int main (int argc, const char **argv)\n");
 155   fprintf (stream, "{\n");
 156   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 157   if (indirect)
 158     fprintf (stream, "   JvRunMainName (\"%s\", argc, argv);\n", classname);
 159   else
 160     {
 161       fprintf (stream, "   extern char %s;\n", mangled_classname);
 162       fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 163     }
 164   fprintf (stream, "}\n");
 165   if (stream != stdout && fclose (stream) != 0)
 166     {
 167       fprintf (stderr, _("%s: Failed to close output file %s\n"),
 168                prog_name, argv[2]);
 169       exit (1);
 170     }
 171   return 0;
 172 }
 173
 174
 175 static char *
 176 do_mangle_classname (const char *string)
 177 {
 178   const char *ptr;
 179   int count = 0;
 180
 181   obstack_grow (&name_obstack, "_ZN", 3);
 182
 183   for (ptr = string; *ptr; ptr++ )
 184     {
 185       if (*ptr == '.')
 186         {
 187           append_gpp_mangled_name (ptr - count, count);
 188           count = 0;
 189         }
 190       else
 191         count++;
 192     }
 193   append_gpp_mangled_name (&ptr [-count], count);
 194   obstack_grow (mangle_obstack, "6class$E", strlen ("6class$E"));
 195   obstack_1grow (mangle_obstack, '\0');
 196   return XOBFINISH (mangle_obstack, char *);
 197 }