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1   /*
2    * @(#) LUSHR.java Jan 8, 2004
3    * 
4    * Copyright (c) 2003 Delft University of Technology Jaffalaan 5, 2628 BX Delft,
5    * the Netherlands All rights reserved.
6    * 
7    * This software is proprietary information of Delft University of Technology
8    * The code is published under the General Public License
9    */
10  package nl.tudelft.simulation.dsol.interpreter.operations;
11  
12  import nl.tudelft.simulation.dsol.interpreter.LocalVariable;
13  import nl.tudelft.simulation.dsol.interpreter.OperandStack;
14  import nl.tudelft.simulation.dsol.interpreter.classfile.Constant;
15  import nl.tudelft.simulation.language.primitives.Primitive;
16  
17  /***
18   * The LUSHR operation as defined in <a
19   * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc8.html">
20   * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc8.html
21   * </a>.
22   * <p>
23   * (c) copyright 2003 <a href="http://www.simulation.tudelft.nl">Delft
24   * University of Technology </a>, the Netherlands. <br>
25   * See for project information <a
26   * href="http://www.simulation.tudelft.nl">www.simulation.tudelft.nl </a> <br>
27   * License of use: <a href="http://www.gnu.org/copyleft/gpl.html">General Public
28   * License (GPL) </a>, no warranty <br>
29   * 
30   * @author <a href="http://www.tbm.tudelft.nl/webstaf/peterja/index.htm">Peter
31   *         Jacobs </a><a
32   *         href="http://www.tbm.tudelft.nl/webstaf/alexandv/index.htm">Alexander
33   *         Verbraeck </a>
34   * @version 1.3 Apr 6, 2004
35   * @since 1.4
36   */
37  public class LUSHR extends VoidOperation
38  {
39  	/*** OP refers to the operand code */
40  	public static final int OP = 125;
41  
42  	/***
43  	 * constructs a new LUSHR
44  	 */
45  	public LUSHR()
46  	{
47  		super();
48  	}
49  
50  	/***
51  	 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation#execute(
52  	 *      nl.tudelft.simulation.dsol.interpreter.OperandStack,
53  	 *      nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
54  	 *      nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
55  	 */
56  	public void execute(final OperandStack stack,
57  			final Constant[] constantPool, final LocalVariable[] localVariables)
58  	{
59  		long l2 = Primitive.toLong(stack.pop()).longValue();
60  		long l1 = Primitive.toLong(stack.pop()).longValue();
61  		stack.push(new Long(l1 >>> l2));
62  	}
63  
64  	/***
65  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
66  	 */
67  	public int getByteLength()
68  	{
69  		return OPCODE_BYTE_LENGTH;
70  	}
71  
72  	/***
73  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
74  	 */
75  	public int getOpcode()
76  	{
77  		return LUSHR.OP;
78  	}
79  }