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1 package org.apache.bcel.classfile; 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 java.io.*; 59 60 /*** 61 * This class represents a (PC offset, line number) pair, i.e., a line number in 62 * the source that corresponds to a relative address in the byte code. This 63 * is used for debugging purposes. 64 * 65 * @version $Id: LineNumber.java,v 1.3 2002/07/11 19:39:04 mdahm Exp $ 66 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 67 * @see LineNumberTable 68 */ 69 public final class LineNumber implements Cloneable, Node, Serializable { 70 private int start_pc; // Program Counter (PC) corresponds to line 71 private int line_number; // number in source file 72 73 /*** 74 * Initialize from another object. 75 */ 76 public LineNumber(LineNumber c) { 77 this(c.getStartPC(), c.getLineNumber()); 78 } 79 80 /*** 81 * Construct object from file stream. 82 * @param file Input stream 83 * @throws IOException 84 */ 85 LineNumber(DataInputStream file) throws IOException 86 { 87 this(file.readUnsignedShort(), file.readUnsignedShort()); 88 } 89 90 /*** 91 * @param start_pc Program Counter (PC) corresponds to 92 * @param line_number line number in source file 93 */ 94 public LineNumber(int start_pc, int line_number) 95 { 96 this.start_pc = start_pc; 97 this.line_number = line_number; 98 } 99 100 /*** 101 * Called by objects that are traversing the nodes of the tree implicitely 102 * defined by the contents of a Java class. I.e., the hierarchy of methods, 103 * fields, attributes, etc. spawns a tree of objects. 104 * 105 * @param v Visitor object 106 */ 107 public void accept(Visitor v) { 108 v.visitLineNumber(this); 109 } 110 111 /*** 112 * Dump line number/pc pair to file stream in binary format. 113 * 114 * @param file Output file stream 115 * @throws IOException 116 */ 117 public final void dump(DataOutputStream file) throws IOException 118 { 119 file.writeShort(start_pc); 120 file.writeShort(line_number); 121 122 } 123 /*** 124 * @return Corresponding source line 125 */ 126 public final int getLineNumber() { return line_number; } 127 128 /*** 129 * @return PC in code 130 */ 131 public final int getStartPC() { return start_pc; } 132 133 /*** 134 * @param line_number. 135 */ 136 public final void setLineNumber(int line_number) { 137 this.line_number = line_number; 138 } 139 140 /*** 141 * @param start_pc. 142 */ 143 public final void setStartPC(int start_pc) { 144 this.start_pc = start_pc; 145 } 146 147 /*** 148 * @return String representation 149 */ 150 public final String toString() { 151 return "LineNumber(" + start_pc + ", " + line_number + ")"; 152 } 153 154 /*** 155 * @return deep copy of this object 156 */ 157 public LineNumber copy() { 158 try { 159 return (LineNumber)clone(); 160 } catch(CloneNotSupportedException e) {} 161 162 return null; 163 } 164 }

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