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1   /*
2    * @(#) IALOAD.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   * The IALOAD operation as defined in <a
21   * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc6.html">
22   * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc6.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 IALOAD extends VoidOperation
40  {
41  	/*** OP refers to the operand code */
42  	public static final int OP = 46;
43  
44  	/***
45  	 * constructs a new IALOAD
46  	 */
47  	public IALOAD()
48  	{
49  		super();
50  	}
51  
52  
53  	/***
54  	 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation
55  	 *      #execute(nl.tudelft.simulation.dsol.interpreter.OperandStack,
56  	 *      nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
57  	 *      nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
58  	 */
59  	public void execute(final OperandStack stack,
60  			final Constant[] constantPool, final LocalVariable[] localVariables)
61  	{
62  		int index = Primitive.toInteger(stack.pop()).intValue();
63  		Object arrayref = stack.pop();
64  		stack.push(new Integer(Array.getInt(arrayref, index)));
65  	}
66  
67  	/***
68  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
69  	 */
70  	public int getByteLength()
71  	{
72  		return OPCODE_BYTE_LENGTH;
73  	}
74  
75  	/***
76  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
77  	 */
78  	public int getOpcode()
79  	{
80  		return IALOAD.OP;
81  	}
82  }