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1   /*
2    * @(#) LSTORE.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 java.io.DataInput;
13  import java.io.IOException;
14  
15  import nl.tudelft.simulation.dsol.interpreter.LocalVariable;
16  import nl.tudelft.simulation.dsol.interpreter.OperandStack;
17  import nl.tudelft.simulation.dsol.interpreter.classfile.Constant;
18  
19  /***
20   * The LSTORE operation as defined in <a
21   * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc8.html">
22   * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc8.html
23   * </a>.
24   * <p>
25   * (c) copyright 2003 <a href="http://www.simulation.tudelft.nl">Delft
26   * University of Technology </a>, the Netherlands. <br>
27   * See for project information <a
28   * href="http://www.simulation.tudelft.nl">www.simulation.tudelft.nl </a> <br>
29   * License of use: <a href="http://www.gnu.org/copyleft/gpl.html">General Public
30   * License (GPL) </a>, no warranty <br>
31   * 
32   * @author <a href="http://www.tbm.tudelft.nl/webstaf/peterja/index.htm">Peter
33   *         Jacobs </a><a
34   *         href="http://www.tbm.tudelft.nl/webstaf/alexandv/index.htm">Alexander
35   *         Verbraeck </a>
36   * @version 1.3 Apr 6, 2004
37   * @since 1.4
38   */
39  public class LSTORE extends VoidOperation
40  {
41  	/*** OP refers to the operand code */
42  	public static final int OP = 55;
43  
44  	/*** the index to load */
45  	private int index = -1;
46  
47  	/*** see the wide statement */
48  	private boolean widened = false;
49  
50  	/***
51  	 * constructs a new LSTORE
52  	 * 
53  	 * @param dataInput the dataInput
54  	 * @throws IOException on IOfailure
55  	 */
56  	public LSTORE(final DataInput dataInput) throws IOException
57  	{
58  		this(dataInput, false);
59  	}
60  
61  	/***
62  	 * constructs a new LSTORE
63  	 * 
64  	 * @param dataInput the dataInput
65  	 * @param widened whether or not to widen
66  	 * @throws IOException on IOfailure
67  	 */
68  	public LSTORE(final DataInput dataInput, final boolean widened)
69  			throws IOException
70  	{
71  		super();
72  		this.widened = widened;
73  		if (widened)
74  		{
75  			this.index = dataInput.readUnsignedShort();
76  		} else
77  		{
78  			this.index = dataInput.readUnsignedByte();
79  		}
80  	}
81  
82  	/***
83  	 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation#execute(
84  	 *      nl.tudelft.simulation.dsol.interpreter.OperandStack,
85  	 *      nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
86  	 *      nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
87  	 */
88  	public void execute(final OperandStack stack,
89  			final Constant[] constantPool, final LocalVariable[] localVariables)
90  	{
91  		localVariables[this.index].setValue(stack.pop());
92  	}
93  
94  	/***
95  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
96  	 */
97  	public int getByteLength()
98  	{
99  		int result = OPCODE_BYTE_LENGTH + 1;
100 		if (this.widened)
101 		{
102 			result++;
103 		}
104 		return result;
105 
106 	}
107 
108 	/***
109 	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
110 	 */
111 	public int getOpcode()
112 	{
113 		return LSTORE.OP;
114 	}
115 }