gcc/java/jvgenmain.c

   1 /* Program to generate "main" a Java(TM) class containing a main method.
   2    Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC 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 2, or (at your option)
   9 any later version.
  10
  11 GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.
  20
  21 Java and all Java-based marks are trademarks or registered trademarks
  22 of Sun Microsystems, Inc. in the United States and other countries.
  23 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  24
  25 /* Written by Per Bothner <bothner@cygnus.com> */
  26
  27 #include "config.h"
  28 #include "system.h"
  29 #include "obstack.h"
  30 #include "jcf.h"
  31 #include "tree.h"
  32 #include "java-tree.h"
  33
  34 static char * do_mangle_classname PARAMS ((const char *string));
  35
  36 struct obstack  name_obstack;
  37 struct obstack *mangle_obstack = &name_obstack;
  38
  39 void
  40 gcc_obstack_init (obstack)
  41      struct obstack *obstack;
  42 {
  43   /* Let particular systems override the size of a chunk.  */
  44 #ifndef OBSTACK_CHUNK_SIZE
  45 #define OBSTACK_CHUNK_SIZE 0
  46 #endif
  47   /* Let them override the alloc and free routines too.  */
  48 #ifndef OBSTACK_CHUNK_ALLOC
  49 #define OBSTACK_CHUNK_ALLOC xmalloc
  50 #endif
  51 #ifndef OBSTACK_CHUNK_FREE
  52 #define OBSTACK_CHUNK_FREE free
  53 #endif
  54   _obstack_begin (obstack, OBSTACK_CHUNK_SIZE, 0,
  55                   (void *(*) PARAMS ((long))) OBSTACK_CHUNK_ALLOC,
  56                   (void (*) PARAMS ((void *))) OBSTACK_CHUNK_FREE);
  57 }
  58
  59 static void usage (const char *) ATTRIBUTE_NORETURN;
  60
  61 static void
  62 usage (const char *name)
  63 {
  64   fprintf (stderr, "Usage: %s [OPTIONS]... CLASSNAMEmain [OUTFILE]\n", name);
  65   exit (1);
  66 }
  67
  68 int
  69 main (int argc, char **argv)
  70 {
  71   char *classname, *p;
  72   FILE *stream;
  73   const char *mangled_classname;
  74   int i, last_arg;
  75
  76   if (argc < 2)
  77     usage (argv[0]);
  78
  79   for (i = 1; i < argc; ++i)
  80     {
  81       if (! strncmp (argv[i], "-D", 2))
  82         {
  83           /* Handled later.  */
  84         }
  85       else
  86         break;
  87     }
  88
  89   if (i < argc - 2 || i == argc)
  90     usage (argv[0]);
  91   last_arg = i;
  92
  93   classname = argv[i];
  94
  95   /* gcj always appends `main' to classname.  We need to strip this here.  */
  96   p = strrchr (classname, 'm');
  97   if (p == NULL || p == classname || strcmp (p, "main") != 0)
  98     usage (argv[0]);
  99   else
 100     *p = '\0';
 101
 102   gcc_obstack_init (mangle_obstack);
 103   mangled_classname = do_mangle_classname (classname);
 104
 105   if (i < argc - 1 && strcmp (argv[i + 1], "-") != 0)
 106     {
 107       const char *outfile = argv[i + 1];
 108       stream = fopen (outfile, "w");
 109       if (stream == NULL)
 110         {
 111           fprintf (stderr, "%s: Cannot open output file: %s\n",
 112                    argv[0], outfile);
 113           exit (1);
 114         }
 115     }
 116   else
 117     stream = stdout;
 118
 119   /* At this point every element of ARGV from 1 to LAST_ARG is a `-D'
 120      option.  Process them appropriately.  */
 121   fprintf (stream, "extern const char **_Jv_Compiler_Properties;\n");
 122   fprintf (stream, "static const char *props[] =\n{\n");
 123   for (i = 1; i < last_arg; ++i)
 124     {
 125       const char *p;
 126       fprintf (stream, "  \"");
 127       for (p = &argv[i][2]; *p; ++p)
 128         {
 129           if (! ISPRINT (*p))
 130             fprintf (stream, "\\%o", *p);
 131           else if (*p == '\\' || *p == '"')
 132             fprintf (stream, "\\%c", *p);
 133           else
 134             putc (*p, stream);
 135         }
 136       fprintf (stream, "\",\n");
 137     }
 138   fprintf (stream, "  0\n};\n\n");
 139
 140   fprintf (stream, "extern int %s;\n", mangled_classname);
 141   fprintf (stream, "int main (int argc, const char **argv)\n");
 142   fprintf (stream, "{\n");
 143   fprintf (stream, "   _Jv_Compiler_Properties = props;\n");
 144   fprintf (stream, "   JvRunMain (&%s, argc, argv);\n", mangled_classname);
 145   fprintf (stream, "}\n");
 146   if (stream != stdout && fclose (stream) != 0)
 147     {
 148       fprintf (stderr, "%s: Failed to close output file %s\n",
 149                argv[0], argv[2]);
 150       exit (1);
 151     }
 152   return 0;
 153 }
 154
 155
 156 static char *
 157 do_mangle_classname (string)
 158      const char *string;
 159 {
 160   const char *ptr;
 161   int count = 0;
 162
 163   obstack_grow (&name_obstack, "_ZN", 3);
 164
 165   for (ptr = string; *ptr; ptr++ )
 166     {
 167       if (ptr[0] == '.')
 168         {
 169           append_gpp_mangled_name (&ptr [-count], count);
 170           count = 0;
 171         }
 172       else
 173         count++;
 174     }
 175   append_gpp_mangled_name (&ptr [-count], count);
 176   obstack_grow (mangle_obstack, "6class$E", 8);
 177   obstack_1grow (mangle_obstack, '\0');
 178   return obstack_finish (mangle_obstack);
 179 }