DupX1


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 and put in it behind
17   *  the second element of the stack.
18   * 
19   * Element1
20   * Element2
21   * ...
22   * 
23   * ->
24   * 
25   * Element1
26   * Element2
27   * Element3
28   * ...
29   * 
30   */
31  public class DupX1 extends SimpleInstruction {
32  
33      /* (non-Javadoc)
34       * @see org.eclipse.jdt.internal.debug.eval.ast.instructions.Instruction#execute()
35       */
36      public void execute() throws CoreException {
37          Object   element1= pop();
38          Object   element2= pop();
39          push(element1);
40          push(element2);
41          push(element1);
42      }
43  
44  }
45

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