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Java > Open Source Codes > org > eclipse > jdt > internal > debug > eval > ast > instructions > Dup


1 /*******************************************************************************
2  * Copyright (c) 2005 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.jdt.internal.debug.eval.ast.instructions;
12
13 import org.eclipse.core.runtime.CoreException;
14
15 /**
16  * Duplicate the top element of the stack
17  *
18  * Element
19  * ...
20  *
21  * ->
22  *
23  * Element
24  * Element
25  * ...
26  *
27  */
28 public class Dup extends SimpleInstruction {
29
30     /* (non-Javadoc)
31      * @see org.eclipse.jdt.internal.debug.eval.ast.instructions.Instruction#execute()
32      */
33     public void execute() throws CoreException {
34         Object JavaDoc element= pop();
35         push(element);
36         push(element);
37     }
38     
39     public String JavaDoc toString() {
40         return "Dup"; //$NON-NLS-1$
41 }
42
43 }
44
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