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 "hash-set.h"
  32 #include "machmode.h"
  33 #include "vec.h"
  34 #include "double-int.h"
  35 #include "input.h"
  36 #include "alias.h"
  37 #include "symtab.h"
  38 #include "options.h"
  39 #include "wide-int.h"
  40 #include "inchash.h"
  41 #include "tree.h"
  42 #include "java-tree.h"
  43 #include "intl.h"
  44 #include "diagnostic.h"
  45
  46 static char * do_mangle_classname (const char *string);
  47
  48 struct obstack  name_obstack;
  49 struct obstack *mangle_obstack = &name_obstack;
  50
  51 static void usage (const char *) ATTRIBUTE_NORETURN;
  52
  53 static void
  54 usage (const char *name)
  55 {
  56   fprintf (stderr, _("Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n"),
  57            name);
  58   exit (1);
  59 }
  60
  61 int
  62 main (int argc, char **argv)
  63 {
  64   char *classname, *p;
  65   FILE *stream;
  66   const char *mangled_classname;
  67   int i, last_arg;
  68   int indirect = 0;
  69   char *prog_name = argv[0];
  70
  71   p = argv[0] + strlen (argv[0]);
  72   while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
  73     --p;
  74   progname = p;
  75
  76   xmalloc_set_program_name (progname);
  77
  78   /* Unlock the stdio streams.  */
  79   unlock_std_streams ();
  80
  81   gcc_init_libintl ();
  82
  83   diagnostic_initialize (global_dc, 0);
  84
  85   if (argc > 1 && ! strcmp (argv[1], "-findirect-dispatch"))
  86     {
  87       indirect = 1;
  88       ++argv;
  89       --argc;
  90     }
  91
  92   if (argc < 2)
  93     usage (prog_name);
  94
  95   for (i = 1; i < argc; ++i)
  96     {
  97       if (! strncmp (argv[i], "-D", 2))
  98         {
  99           /* Handled later.  Check "-D XXX=YYY".  */
 100           if (argv[i][2] == '\0')
 101             i++;
 102         }
 103       else
 104         break;
 105     }
 106
 107   if (i < argc - 2 || i == argc)
 108     usage (prog_name);
 109   last_arg = i;
 110
 111   classname = argv[i];
 112
 113   /* gcj always appends `main' to classname.  We need to strip this here.  */
 114   p = strrchr (classname, 'm');
 115   if (p == NULL || p == classname || strcmp (p, "main") != 0)
 116     usage (prog_name);
 117   else
 118     *p = '\0';
 119
 120   gcc_obstack_init (mangle_obstack);
 121   mangled_classname = do_mangle_classname (classname);
 122
 123   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 124     {
 125       const char *outfile = argv[i + 1];
 126       stream = fopen (outfile, "w");
 127       if (stream == NULL)
 128         {
 129           fprintf (stderr, _("%s: Cannot open output file: %s\n"),
 130                    prog_name, outfile);
 131           exit (1);
 132         }
 133     }
 134   else
 135     stream = stdout;
 136
 137   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 138      option.  Process them appropriately.  */
 139   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 140   if (indirect)
 141     fprintf (stream, "extern void JvRunMainName ();\n");
 142   else
 143     fprintf (stream, "extern void JvRunMain ();\n");
 144   fprintf (stream, "static const char *props[] =\n{\n");
 145   for (i = 1; i < last_arg; ++i)
 146     {
 147       const char *p;
 148
 149       if (strcmp (argv[i], "-D") == 0)
 150         continue;
 151
 152       fprintf (stream, "  \"");
 153       for (p = argv[i]; *p; ++p)
 154         {
 155           if (! ISPRINT (*p))
 156             fprintf (stream, "\\%o", *p);
 157           else if (*p == '\\' || *p == '"')
 158             fprintf (stream, "\\%c", *p);
 159           else
 160             putc (*p, stream);
 161         }
 162       fprintf (stream, "\",\n");
 163     }
 164   fprintf (stream, "  0\n};\n\n");
 165
 166   fprintf (stream, "int main (int argc, const char **argv)\n");
 167   fprintf (stream, "{\n");
 168   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 169   if (indirect)
 170     fprintf (stream, "   JvRunMainName (\"%s\", argc, argv);\n", classname);
 171   else
 172     {
 173       fprintf (stream, "   extern char %s;\n", mangled_classname);
 174       fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 175     }
 176   fprintf (stream, "}\n");
 177   if (stream != stdout && fclose (stream) != 0)
 178     {
 179       fprintf (stderr, _("%s: Failed to close output file %s\n"),
 180                prog_name, argv[2]);
 181       exit (1);
 182     }
 183   return 0;
 184 }
 185
 186
 187 static char *
 188 do_mangle_classname (const char *string)
 189 {
 190   const char *ptr;
 191   int count = 0;
 192
 193   obstack_grow (&name_obstack, "_ZN", 3);
 194
 195   for (ptr = string; *ptr; ptr++ )
 196     {
 197       if (*ptr == '.')
 198         {
 199           append_gpp_mangled_name (ptr - count, count);
 200           count = 0;
 201         }
 202       else
 203         count++;
 204     }
 205   append_gpp_mangled_name (&ptr [-count], count);
 206   obstack_grow (mangle_obstack, "6class$E", strlen ("6class$E"));
 207   obstack_1grow (mangle_obstack, '\0');
 208   return XOBFINISH (mangle_obstack, char *);
 209 }