1 package org.apache.bcel.generic;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache BCEL" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache BCEL", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import org.apache.bcel.Constants;
58 import org.apache.bcel.classfile.*;
59
60 /***
61 * This class represents a line number within a method, i.e., give an instruction
62 * a line number corresponding to the source code line.
63 *
64 * @version $Id: LineNumberGen.java,v 1.3 2002/07/11 19:39:04 mdahm Exp $
65 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
66 * @see LineNumber
67 * @see MethodGen
68 */
69 public class LineNumberGen
70 implements InstructionTargeter, Cloneable, java.io.Serializable
71 {
72 private InstructionHandle ih;
73 private int src_line;
74
75 /***
76 * Create a line number.
77 *
78 * @param ih instruction handle to reference
79 */
80 public LineNumberGen(InstructionHandle ih, int src_line) {
81 setInstruction(ih);
82 setSourceLine(src_line);
83 }
84
85 /***
86 * @return true, if ih is target of this line number
87 */
88 public boolean containsTarget(InstructionHandle ih) {
89 return this.ih == ih;
90 }
91
92 /***
93 * @param old_ih old target
94 * @param new_ih new target
95 */
96 public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
97 if(old_ih != ih)
98 throw new ClassGenException("Not targeting " + old_ih + ", but " + ih + "}");
99 else
100 setInstruction(new_ih);
101 }
102
103 /***
104 * Get LineNumber attribute .
105 *
106 * This relies on that the instruction list has already been dumped to byte code or
107 * or that the `setPositions' methods has been called for the instruction list.
108 */
109 public LineNumber getLineNumber() {
110 return new LineNumber(ih.getPosition(), src_line);
111 }
112
113 public void setInstruction(InstructionHandle ih) {
114 BranchInstruction.notifyTarget(this.ih, ih, this);
115
116 this.ih = ih;
117 }
118
119 public Object clone() {
120 try {
121 return super.clone();
122 } catch(CloneNotSupportedException e) {
123 System.err.println(e);
124 return null;
125 }
126 }
127
128 public InstructionHandle getInstruction() { return ih; }
129 public void setSourceLine(int src_line) { this.src_line = src_line; }
130 public int getSourceLine() { return src_line; }
131 }
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