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10 package nl.tudelft.simulation.dsol.interpreter.operations;
11
12 import java.io.DataInput;
13 import java.io.IOException;
14 import java.lang.reflect.Field;
15
16 import nl.tudelft.simulation.dsol.interpreter.InterpreterException;
17 import nl.tudelft.simulation.dsol.interpreter.LocalVariable;
18 import nl.tudelft.simulation.dsol.interpreter.OperandStack;
19 import nl.tudelft.simulation.dsol.interpreter.classfile.Constant;
20 import nl.tudelft.simulation.dsol.interpreter.classfile.ConstantFieldref;
21 import nl.tudelft.simulation.language.primitives.Primitive;
22 import nl.tudelft.simulation.language.reflection.ClassUtil;
23
24 /***
25 * The PUTFIELD operation as defined in <a
26 * href="http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc11.html">
27 * http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc11.html
28 * </a>.
29 * <p>
30 * (c) copyright 2003 <a href="http://www.simulation.tudelft.nl">Delft
31 * University of Technology </a>, the Netherlands. <br>
32 * See for project information <a
33 * href="http://www.simulation.tudelft.nl">www.simulation.tudelft.nl </a> <br>
34 * License of use: <a href="http://www.gnu.org/copyleft/gpl.html">General Public
35 * License (GPL) </a>, no warranty <br>
36 *
37 * @author <a href="http://www.tbm.tudelft.nl/webstaf/peterja/index.htm">Peter
38 * Jacobs </a><a
39 * href="http://www.tbm.tudelft.nl/webstaf/alexandv/index.htm">Alexander
40 * Verbraeck </a>
41 * @version 1.3 Apr 6, 2004
42 * @since 1.4
43 */
44
45 public class PUTFIELD extends VoidOperation
46 {
47 /*** OP refers to the operand code */
48 public static final int OP = 181;
49
50 /*** the index to load */
51 private int index = -1;
52
53 /***
54 * constructs a new PUTFIELD
55 *
56 * @param dataInput the dataInput
57 * @throws IOException on IOfailure
58 */
59 public PUTFIELD(final DataInput dataInput) throws IOException
60 {
61 super();
62 this.index = dataInput.readUnsignedShort();
63 }
64
65 /***
66 * @see nl.tudelft.simulation.dsol.interpreter.operations.VoidOperation#execute(
67 * nl.tudelft.simulation.dsol.interpreter.OperandStack,
68 * nl.tudelft.simulation.dsol.interpreter.classfile.Constant[],
69 * nl.tudelft.simulation.dsol.interpreter.LocalVariable[])
70 */
71 public void execute(final OperandStack stack,
72 final Constant[] constantPool, final LocalVariable[] localVariables)
73 {
74 try
75 {
76 ConstantFieldref constantFieldref = (ConstantFieldref) constantPool[this.index];
77 Object value = stack.pop();
78 Object target = stack.pop();
79 Field field = ClassUtil.resolveField(target, constantFieldref
80 .getConstantNameAndType().getName());
81 field.setAccessible(true);
82 if (!field.getType().isPrimitive())
83 {
84 field.set(target, value);
85 return;
86 }
87 field.set(target, (Primitive.cast(field.getType(), value)));
88 } catch (Exception exception)
89 {
90 throw new InterpreterException(exception);
91 }
92 }
93
94 /***
95 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getByteLength()
96 */
97 public int getByteLength()
98 {
99 return OPCODE_BYTE_LENGTH + 2;
100 }
101
102 /***
103 * @see nl.tudelft.simulation.dsol.interpreter.Operation#getOpcode()
104 */
105 public int getOpcode()
106 {
107 return PUTFIELD.OP;
108 }
109 }