1 /*
2 * Copyright (c) 2001, Zoltan Farkas All Rights Reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 package net.sf.zel.instr;
20
21 import net.sf.zel.vm.*;
22
23 /**
24 * @author zoly
25 * @version 1.0
26 */
27 public final class DUP extends Instruction
28 {
29 private static final long serialVersionUID = -5165232100964035429L;
30
31 private DUP(){};
32
33 /**
34 * DUP Instruction microcode
35 * @param context ExecutionContext
36 * @throws VMException
37 */
38 public void execute(ExecutionContext context)
39 {
40 context.stack.push(context.stack.peek());
41 context.ip++;
42 }
43 /**
44 * instance
45 */
46 public static final Instruction instance = new DUP();
47 }