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