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
   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
  37 static char * do_mangle_classname (const char *string);
  38
  39 struct obstack  name_obstack;
  40 struct obstack *mangle_obstack = &name_obstack;
  41
  42 void
  43 gcc_obstack_init (struct obstack *obstack)
  44 {
  45   /* Let particular systems override the size of a chunk.  */
  46 #ifndef OBSTACK_CHUNK_SIZE
  47 #define OBSTACK_CHUNK_SIZE 0
  48 #endif
  49   /* Let them override the alloc and free routines too.  */
  50 #ifndef OBSTACK_CHUNK_ALLOC
  51 #define OBSTACK_CHUNK_ALLOC xmalloc
  52 #endif
  53 #ifndef OBSTACK_CHUNK_FREE
  54 #define OBSTACK_CHUNK_FREE free
  55 #endif
  56   _obstack_begin (obstack, OBSTACK_CHUNK_SIZE, 0,
  57                   (void *(*) (long)) OBSTACK_CHUNK_ALLOC,
  58                   (void (*) (void *)) OBSTACK_CHUNK_FREE);
  59 }
  60
  61 static void usage (const char *) ATTRIBUTE_NORETURN;
  62
  63 static void
  64 usage (const char *name)
  65 {
  66   fprintf (stderr, "Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n", name);
  67   exit (1);
  68 }
  69
  70 int
  71 main (int argc, char **argv)
  72 {
  73   char *classname, *p;
  74   FILE *stream;
  75   const char *mangled_classname;
  76   int i, last_arg;
  77
  78   if (argc < 2)
  79     usage (argv[0]);
  80
  81   for (i = 1; i < argc; ++i)
  82     {
  83       if (! strncmp (argv[i], "-D", 2))
  84         {
  85           /* Handled later.  */
  86         }
  87       else
  88         break;
  89     }
  90
  91   if (i < argc - 2 || i == argc)
  92     usage (argv[0]);
  93   last_arg = i;
  94
  95   classname = argv[i];
  96
  97   /* gcj always appends `main' to classname.  We need to strip this here.  */
  98   p = strrchr (classname, 'm');
  99   if (p == NULL || p == classname || strcmp (p, "main") != 0)
 100     usage (argv[0]);
 101   else
 102     *p = '\0';
 103
 104   gcc_obstack_init (mangle_obstack);
 105   mangled_classname = do_mangle_classname (classname);
 106
 107   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 108     {
 109       const char *outfile = argv[i + 1];
 110       stream = fopen (outfile, "w");
 111       if (stream == NULL)
 112         {
 113           fprintf (stderr, "%s: Cannot open output file: %s\n",
 114                    argv[0], outfile);
 115           exit (1);
 116         }
 117     }
 118   else
 119     stream = stdout;
 120
 121   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 122      option.  Process them appropriately.  */
 123   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 124   fprintf (stream, "static const char *props[] =\n{\n");
 125   for (i = 1; i < last_arg; ++i)
 126     {
 127       const char *p;
 128       fprintf (stream, "  \"");
 129       for (p = &argv[i][2]; *p; ++p)
 130         {
 131           if (! ISPRINT (*p))
 132             fprintf (stream, "\\%o", *p);
 133           else if (*p == '\\' || *p == '"')
 134             fprintf (stream, "\\%c", *p);
 135           else
 136             putc (*p, stream);
 137         }
 138       fprintf (stream, "\",\n");
 139     }
 140   fprintf (stream, "  0\n};\n\n");
 141
 142   fprintf (stream, "extern int %s;\n", mangled_classname);
 143   fprintf (stream, "int main (int argc, const char **argv)\n");
 144   fprintf (stream, "{\n");
 145   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 146   fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 147   fprintf (stream, "}\n");
 148   if (stream != stdout && fclose (stream) != 0)
 149     {
 150       fprintf (stderr, "%s: Failed to close output file %s\n",
 151                argv[0], argv[2]);
 152       exit (1);
 153     }
 154   return 0;
 155 }
 156
 157
 158 static char *
 159 do_mangle_classname (const char *string)
 160 {
 161   const char *ptr;
 162   int count = 0;
 163
 164   obstack_grow (&name_obstack, "_ZN", 3);
 165
 166   for (ptr = string; *ptr; ptr++ )
 167     {
 168       if (ptr[0] == '.')
 169         {
 170           append_gpp_mangled_name (&ptr [-count], count);
 171           count = 0;
 172         }
 173       else
 174         count++;
 175     }
 176   append_gpp_mangled_name (&ptr [-count], count);
 177   obstack_grow (mangle_obstack, "6class$E", 8);
 178   obstack_1grow (mangle_obstack, '\0');
 179   return obstack_finish (mangle_obstack);
 180 }