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Java > Open Source Codes > com > go > trove > classfile > Label


1 /* ====================================================================
2  * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
3  * ====================================================================
4  * The Tea Software License, Version 1.1
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9  * modification, are permitted provided that the following conditions
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12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
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15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
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20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
22  * "This product includes software developed by the
23  * Walt Disney Internet Group (http://opensource.go.com/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
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27  * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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51  */
52
53 package com.go.trove.classfile;
54
55 /******************************************************************************
56  * A label is used to manipulate a branch instruction's branch location. A
57  * label has a location address. Branch instructions have origin addresses,
58  * which contain the address of the opcode that performs the conditional or
59  * unconditional branch.
60  *
61  * <p>Labels are generated by factory methods in the CodeBuilder class.
62  * If a label has any origin addresses, its location address must be set by
63  * the time the CodeBuilder's class file is output.
64  *
65  * @author Brian S O'Neill
66  * @version
67  * <!--$$Revision:--> 22 <!-- $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
68  * @see CodeBuilder
69  */
70 public interface Label extends Location {
71     /**
72      * Sets the location of a label to be at the current postion in the
73      * code being generated.
74      *
75      * @return the Label itself.
76      */
77     public Label setLocation();
78
79     /**
80      * Returns -1 if the location isn't yet fully resolved.
81      *
82      * @exception IllegalStateException when the location is unknown because
83      * the setLocation method was never called.
84      */
85     public int getLocation() throws IllegalStateException JavaDoc;
86 }
87
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