View Javadoc

1   /*
2    * @(#) FCMPG.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  
16  /***
17   * The FCMPG operation as defined in <a
18   * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc4.html">
19   * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc4.html
20   * </a>.
21   * <p>
22   * (c) copyright 2003 <a href="http://www.simulation.tudelft.nl">Delft
23   * University of Technology </a>, the Netherlands. <br>
24   * See for project information <a
25   * href="http://www.simulation.tudelft.nl">www.simulation.tudelft.nl </a> <br>
26   * License of use: <a href="http://www.gnu.org/copyleft/gpl.html">General Public
27   * License (GPL) </a>, no warranty <br>
28   * 
29   * @author <a href="http://www.tbm.tudelft.nl/webstaf/peterja/index.htm">Peter
30   *         Jacobs </a><a
31   *         href="http://www.tbm.tudelft.nl/webstaf/alexandv/index.htm">Alexander
32   *         Verbraeck </a>
33   * @version 1.3 Apr 6, 2004
34   * @since 1.4
35   */
36  public class FCMPG extends VoidOperation
37  {
38  	/*** OP refers to the operand code */
39  	public static final int OP = 150;
40  
41  	/***
42  	 * constructs a new FCMPG
43  	 */
44  	public FCMPG()
45  	{
46  		super();
47  	}
48  
49  	/***
50  	 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation
51  	 *      #execute(nl.tudelft.simulation.dsol.interpreter.OperandStack,
52  	 *      nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
53  	 *      nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
54  	 */
55  	public void execute(final OperandStack stack,
56  			final Constant[] constantPool, final LocalVariable[] localVariables)
57  	{
58  		Float value2 = (Float) stack.pop();
59  		Float value1 = (Float) stack.pop();
60  		if (value1.isNaN() || value2.isNaN())
61  		{
62  			stack.push(new Integer(1));
63  		} else
64  		{
65  			stack.push(new Integer(value1.compareTo(value2)));
66  		}
67  	}
68  
69  	/***
70  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
71  	 */
72  	public int getByteLength()
73  	{
74  		return OPCODE_BYTE_LENGTH;
75  	}
76  
77  	/***
78  	 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
79  	 */
80  	public int getOpcode()
81  	{
82  		return FCMPG.OP;
83  	}
84  }