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1   /*
2    * @(#) MONITORENTER.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.concurrent.Monitor;
16  
17  /***
18   * The MONITORENTER operation as defined in <a
19   * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc9.html">
20   * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc9.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 MONITORENTER extends VoidOperation
38  {
39  	/*** OP refers to the operand code */
40  	public static final int OP = 194;
41  
42  	/***
43  	 * constructs a new MONITORENTER
44  	 */
45  	public MONITORENTER()
46  	{
47  		super();
48  	}
49  
50  	/***
51  	 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation
52  	 *      #execute(nl.tudelft.simulation.dsol.interpreter.OperandStack,
53  	 *      nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
54  	 *      nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
55  	 */
56  	public synchronized void execute(final OperandStack stack,
57  			final Constant[] constantPool, final LocalVariable[] localVariables)
58  	{
59  		Monitor.lock(stack.pop());
60  	}
61  
62  	/***
63  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
64  	 */
65  	public int getByteLength()
66  	{
67  		return OPCODE_BYTE_LENGTH;
68  	}
69  
70  	/***
71  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
72  	 */
73  	public int getOpcode()
74  	{
75  		return MONITORENTER.OP;
76  	}
77  }