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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 import nl.tudelft.simulation.language.primitives.Primitive;
19
20 /***
21 * The IINC operation as defined in <a
22 * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc6.html">
23 * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc6.html
24 * </a>.
25 * <p>
26 * (c) copyright 2003 <a href="http://www.simulation.tudelft.nl">Delft
27 * University of Technology </a>, the Netherlands. <br>
28 * See for project information <a
29 * href="http://www.simulation.tudelft.nl">www.simulation.tudelft.nl </a> <br>
30 * License of use: <a href="http://www.gnu.org/copyleft/gpl.html">General Public
31 * License (GPL) </a>, no warranty <br>
32 *
33 * @author <a href="http://www.tbm.tudelft.nl/webstaf/peterja/index.htm">Peter
34 * Jacobs </a><a
35 * href="http://www.tbm.tudelft.nl/webstaf/alexandv/index.htm">Alexander
36 * Verbraeck </a>
37 * @version 1.3 Apr 6, 2004
38 * @since 1.4
39 */
40 public class IINC extends VoidOperation
41 {
42 /*** OP refers to the operand code */
43 public static final int OP = 132;
44
45 /*** the index to the localVariables */
46 private int index = -1;
47
48 /*** the constant */
49 private int constant = -1;
50
51 /*** see the wide statement */
52 private boolean widened = false;
53
54 /***
55 * constructs a new IINC
56 *
57 * @param dataInput the dataInput to read
58 * @throws IOException on IOException
59 */
60 public IINC(final DataInput dataInput) throws IOException
61 {
62 this(dataInput, false);
63 }
64
65 /***
66 * constructs a new IINC
67 *
68 * @param dataInput the dataInput to read
69 * @param widened is the operation widened
70 * @throws IOException on IOException
71 *
72 */
73 public IINC(final DataInput dataInput, final boolean widened)
74 throws IOException
75 {
76 super();
77 this.widened = widened;
78 if (widened)
79 {
80 this.index = dataInput.readUnsignedShort();
81 this.constant = dataInput.readShort();
82 } else
83 {
84 this.index = dataInput.readUnsignedByte();
85 this.constant = dataInput.readByte();
86 }
87 }
88
89 /***
90 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation#execute(
91 * nl.tudelft.simulation.dsol.interpreter.OperandStack,
92 * nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
93 * nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
94 */
95 public void execute(final OperandStack stack,
96 final Constant[] constantPool, final LocalVariable[] localVariables)
97 {
98 int oldValue = Primitive.toInteger(
99 localVariables[this.index].getValue()).intValue();
100 localVariables[this.index].setValue(new Integer(oldValue
101 + this.constant));
102 }
103
104 /***
105 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
106 */
107 public int getByteLength()
108 {
109 int result = OPCODE_BYTE_LENGTH + 2;
110 if (this.widened)
111 {
112 result = result + 2;
113 }
114 return result;
115 }
116
117 /***
118 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
119 */
120 public int getOpcode()
121 {
122 return IINC.OP;
123 }
124 }