Mercurial > hg > blitz_condensed
annotate src/com/go/trove/classfile/LineNumberTableAttr.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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rev | line source |
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1 /* ==================================================================== |
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group |
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3 * ==================================================================== |
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4 * The Tea Software License, Version 1.1 |
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5 * |
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. |
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7 * |
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8 * Redistribution and use in source and binary forms, with or without |
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9 * modification, are permitted provided that the following conditions |
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10 * are met: |
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11 * |
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12 * 1. Redistributions of source code must retain the above copyright |
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13 * notice, this list of conditions and the following disclaimer. |
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14 * |
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15 * 2. Redistributions in binary form must reproduce the above copyright |
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16 * notice, this list of conditions and the following disclaimer in |
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17 * the documentation and/or other materials provided with the |
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18 * distribution. |
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19 * |
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20 * 3. The end-user documentation included with the redistribution, |
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21 * if any, must include the following acknowledgment: |
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22 * "This product includes software developed by the |
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23 * Walt Disney Internet Group (http://opensource.go.com/)." |
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24 * Alternately, this acknowledgment may appear in the software itself, |
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25 * if and wherever such third-party acknowledgments normally appear. |
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26 * |
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must |
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28 * not be used to endorse or promote products derived from this |
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29 * software without prior written permission. For written |
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30 * permission, please contact opensource@dig.com. |
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31 * |
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32 * 5. Products derived from this software may not be called "Tea", |
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", |
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior |
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35 * written permission of the Walt Disney Internet Group. |
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36 * |
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS |
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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48 * ==================================================================== |
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49 * |
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50 * For more information about Tea, please see http://opensource.go.com/. |
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51 */ |
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52 |
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53 package com.go.trove.classfile; |
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54 |
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55 import java.util.*; |
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56 import java.io.*; |
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57 |
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58 /****************************************************************************** |
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59 * This class corresponds to the LineNumberTable_attribute structure as |
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60 * defined in section 4.7.6 of <i>The Java Virtual Machine Specification</i>. |
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61 * |
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62 * @author Brian S O'Neill |
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63 * @version |
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64 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $--> |
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65 */ |
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66 class LineNumberTableAttr extends Attribute { |
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67 private List mEntries = new ArrayList(); |
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68 private boolean mClean = false; |
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69 |
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70 public LineNumberTableAttr(ConstantPool cp) { |
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71 super(cp, LINE_NUMBER_TABLE); |
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72 } |
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73 |
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74 public int getLineNumber(Location start) { |
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75 clean(); |
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76 int index = Collections.binarySearch(mEntries, new Entry(start, 0)); |
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77 if (index < 0) { |
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78 if ((index = -index - 2) < 0) { |
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79 return -1; |
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80 } |
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81 } |
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82 return ((Entry)mEntries.get(index)).mLineNumber; |
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83 } |
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84 |
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85 public void addEntry(Location start, int line_number) { |
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86 check("line number", line_number); |
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87 mEntries.add(new Entry(start, line_number)); |
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88 mClean = false; |
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89 } |
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90 |
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91 public int getLength() { |
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92 clean(); |
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93 return 2 + 4 * mEntries.size(); |
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94 } |
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95 |
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96 public void writeDataTo(DataOutput dout) throws IOException { |
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97 int size = mEntries.size(); |
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98 dout.writeShort(size); |
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99 for (int i=0; i<size; i++) { |
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100 Entry entry = (Entry)mEntries.get(i); |
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101 |
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102 int start_pc = entry.mStart.getLocation(); |
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103 |
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104 check("line number table entry start PC", start_pc); |
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105 |
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106 dout.writeShort(start_pc); |
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107 dout.writeShort(entry.mLineNumber); |
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108 } |
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109 } |
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110 |
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111 private void check(String type, int addr) throws RuntimeException { |
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112 if (addr < 0 || addr > 65535) { |
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113 throw new RuntimeException("Value for " + type + " out of " + |
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114 "valid range: " + addr); |
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115 |
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116 } |
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117 } |
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118 |
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119 private void clean() { |
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120 if (!mClean) { |
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121 mClean = true; |
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122 |
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123 // Clean things up by removing multiple mappings of the same |
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124 // start_pc to line numbers. Only keep the last one. |
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125 // This has to be performed now because the Labels should have |
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126 // a pc location, but before they did not. Since entries must be |
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127 // sorted ascending by start_pc, use a sorted set. |
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128 |
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129 Set reduced = new TreeSet(); |
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130 for (int i = mEntries.size(); --i >= 0; ) { |
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131 reduced.add(mEntries.get(i)); |
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132 } |
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133 |
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134 mEntries = new ArrayList(reduced); |
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135 } |
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136 } |
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137 |
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138 static Attribute define(ConstantPool cp, |
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139 String name, |
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140 int length, |
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141 DataInput din) throws IOException { |
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142 |
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143 LineNumberTableAttr lineNumbers = new LineNumberTableAttr(cp); |
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144 |
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145 int size = din.readUnsignedShort(); |
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146 for (int i=0; i<size; i++) { |
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147 int start_pc = din.readUnsignedShort(); |
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148 int line_number = din.readUnsignedShort(); |
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149 |
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150 lineNumbers.addEntry(new FixedLocation(start_pc), line_number); |
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151 } |
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152 |
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153 return lineNumbers; |
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154 } |
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155 |
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156 private static class Entry implements Comparable { |
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157 public final Location mStart; |
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158 public final int mLineNumber; |
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159 |
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160 public Entry(Location start, int line_number) { |
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161 mStart = start; |
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162 mLineNumber = line_number; |
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163 } |
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164 |
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165 public int compareTo(Object other) { |
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166 int thisLoc = mStart.getLocation(); |
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167 int thatLoc = ((Entry)other).mStart.getLocation(); |
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168 |
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169 if (thisLoc < thatLoc) { |
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170 return -1; |
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171 } |
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172 else if (thisLoc > thatLoc) { |
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173 return 1; |
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174 } |
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175 else { |
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176 return 0; |
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177 } |
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178 } |
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179 |
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180 public boolean equals(Object other) { |
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181 if (other instanceof Entry) { |
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182 return mStart.getLocation() == |
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183 ((Entry)other).mStart.getLocation(); |
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184 } |
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185 return false; |
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186 } |
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187 |
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188 public String toString() { |
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189 return "start_pc=" + mStart.getLocation() + " => " + |
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190 "line_number=" + mLineNumber; |
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191 } |
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192 } |
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193 } |