/*******************************************************************************
 * Copyright (c) 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.debug.eval.ast.instructions;

import org.eclipse.core.runtime.CoreException;

/**
 * Duplicate the top element of the stack and put in it behind
 *  the second element of the stack.
 * 
 * Element1
 * Element2
 * ...
 * 
 * ->
 * 
 * Element1
 * Element2
 * Element3
 * ...
 * 
 */
public class DupX1 extends SimpleInstruction {

	/* (non-Javadoc)
	 * @see org.eclipse.jdt.internal.debug.eval.ast.instructions.Instruction#execute()
	 */
	public void execute() throws CoreException {
		Object element1= pop();
		Object element2= pop();
		push(element1);
		push(element2);
		push(element1);
	}

}
