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1   /*
2    * @(#) AALOAD.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.lang.reflect.Array;
13  
14  import nl.tudelft.simulation.dsol.interpreter.LocalVariable;
15  import nl.tudelft.simulation.dsol.interpreter.OperandStack;
16  import nl.tudelft.simulation.dsol.interpreter.classfile.Constant;
17  import nl.tudelft.simulation.language.primitives.Primitive;
18  
19  
20  
21  /***
22   * The AALOAD operation as defined in <a
23   * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc.html">
24   * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc.html
25   * </a>.
26   * <p>
27   * (c) copyright 2003 <a href="http://www.simulation.tudelft.nl">Delft
28   * University of Technology </a>, the Netherlands. <br>
29   * See for project information <a
30   * href="http://www.simulation.tudelft.nl">www.simulation.tudelft.nl </a> <br>
31   * License of use: <a href="http://www.gnu.org/copyleft/gpl.html">General Public
32   * License (GPL) </a>, no warranty <br>
33   * 
34   * @author <a href="http://www.tbm.tudelft.nl/webstaf/peterja/index.htm">Peter
35   *         Jacobs </a><a
36   *         href="http://www.tbm.tudelft.nl/webstaf/alexandv/index.htm">Alexander
37   *         Verbraeck </a>
38   * @version 1.3 Apr 6, 2004
39   * @since 1.4
40   */
41  public class AALOAD extends VoidOperation
42  {
43  	/*** OP refers to the operand code */
44  	public static final int OP = 50;
45  
46  	/***
47  	 * constructs a new AALOAD
48  	 */
49  	public AALOAD()
50  	{
51  		super();
52  	}
53  
54  	/***
55  	 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation
56  	 *      #execute(nl.tudelft.simulation.dsol.interpreter.OperandStack,
57  	 *      nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
58  	 *      nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
59  	 */
60  	public void execute(final OperandStack stack,
61  			final Constant[] constantPool, final LocalVariable[] localVariables)
62  	{
63  		int index = Primitive.toInteger(stack.pop()).intValue();
64  		Object arrayref = stack.pop();
65  		stack.push(Array.get(arrayref, index));
66  	}
67  
68  	/***
69  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
70  	 */
71  	public int getByteLength()
72  	{
73  		return OPCODE_BYTE_LENGTH;
74  	}
75  
76  	/***
77  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
78  	 */
79  	public int getOpcode()
80  	{
81  		return AALOAD.OP;
82  	}
83  }