1 /*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5 package com.sun.org.apache.bcel.internal.generic;
6
7 /* ====================================================================
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 2001 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution,
26 * if any, must include the following acknowledgment:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowledgment may appear in the software itself,
30 * if and wherever such third-party acknowledgments normally appear.
31 *
32 * 4. The names "Apache" and "Apache Software Foundation" and
33 * "Apache BCEL" must not be used to endorse or promote products
34 * derived from this software without prior written permission. For
35 * written permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache",
38 * "Apache BCEL", nor may "Apache" appear in their name, without
39 * prior written permission of the Apache Software Foundation.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
57 * information on the Apache Software Foundation, please see
58 * <http://www.apache.org/>.
59 */
60
61 import com.sun.org.apache.bcel.internal.Constants;
62 import com.sun.org.apache.bcel.internal.classfile.*;
63
64 /**
65 * This class represents a line number within a method, i.e., give an instruction
66 * a line number corresponding to the source code line.
67 *
68 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
69 * @see LineNumber
70 * @see MethodGen
71 */
72 public class LineNumberGen
73 implements InstructionTargeter, Cloneable, java.io.Serializable
74 {
75 private InstructionHandle ih;
76 private int src_line;
77
78 /**
79 * Create a line number.
80 *
81 * @param ih instruction handle to reference
82 */
83 public LineNumberGen(InstructionHandle ih, int src_line) {
84 setInstruction(ih);
85 setSourceLine(src_line);
86 }
87
88 /**
89 * @return true, if ih is target of this line number
90 */
91 public boolean containsTarget(InstructionHandle ih) {
92 return this.ih == ih;
93 }
94
95 /**
96 * @param old_ih old target
97 * @param new_ih new target
98 */
99 public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
100 if(old_ih != ih)
101 throw new ClassGenException("Not targeting " + old_ih + ", but " + ih + "}");
102 else
103 setInstruction(new_ih);
104 }
105
106 /**
107 * Get LineNumber attribute .
108 *
109 * This relies on that the instruction list has already been dumped to byte code or
110 * or that the `setPositions' methods has been called for the instruction list.
111 */
112 public LineNumber getLineNumber() {
113 return new LineNumber(ih.getPosition(), src_line);
114 }
115
116 public void setInstruction(InstructionHandle ih) {
117 BranchInstruction.notifyTarget(this.ih, ih, this);
118
119 this.ih = ih;
120 }
121
122 public Object clone() {
123 try {
124 return super.clone();
125 } catch(CloneNotSupportedException e) {
126 System.err.println(e);
127 return null;
128 }
129 }
130
131 public InstructionHandle getInstruction() { return ih; }
132 public void setSourceLine(int src_line) { this.src_line = src_line; }
133 public int getSourceLine() { return src_line; }
134 }