Mercurial > hg > blitz_condensed
annotate src/com/go/trove/classfile/LocalVariableTableAttr.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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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 LocalVariableTable_attribute structure as |
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60 * defined in section 4.7.7 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 LocalVariableTableAttr extends Attribute { |
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67 private List mEntries = new ArrayList(10); |
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68 private List mCleanEntries; |
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69 private int mRangeCount; |
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70 |
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71 public LocalVariableTableAttr(ConstantPool cp) { |
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72 super(cp, LOCAL_VARIABLE_TABLE); |
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73 } |
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74 |
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75 /** |
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76 * Add an entry into the LocalVariableTableAttr. |
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77 */ |
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78 public void addEntry(LocalVariable localVar) { |
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79 String varName = localVar.getName(); |
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80 if (varName != null) { |
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81 ConstantUTFInfo name = ConstantUTFInfo.make(mCp, varName); |
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82 ConstantUTFInfo descriptor = |
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83 ConstantUTFInfo.make(mCp, localVar.getType().toString()); |
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84 |
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85 mEntries.add(new Entry(localVar, name, descriptor)); |
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86 } |
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87 |
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88 mCleanEntries = null; |
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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 + 10 * mRangeCount; |
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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 dout.writeShort(mRangeCount); |
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98 |
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99 int size = mCleanEntries.size(); |
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100 for (int i=0; i<size; i++) { |
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101 Entry entry = (Entry)mEntries.get(i); |
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102 LocalVariable localVar = entry.mLocalVar; |
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103 |
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104 SortedSet ranges = localVar.getLocationRangeSet(); |
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105 |
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106 int name_index = entry.mName.getIndex(); |
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107 int descriptor_index = entry.mDescriptor.getIndex(); |
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108 int index = localVar.getNumber(); |
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109 |
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110 check("local variable table entry name index", name_index); |
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111 check("local variable table entry descriptor index", |
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112 descriptor_index); |
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113 check("local variable table entry index", index); |
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114 |
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115 Iterator it = ranges.iterator(); |
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116 while (it.hasNext()) { |
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117 LocationRange range = (LocationRange)it.next(); |
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118 |
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119 Location startLocation = range.getStartLocation(); |
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120 Location endLocation = range.getEndLocation(); |
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121 |
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122 int start_pc = startLocation.getLocation(); |
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123 int length = endLocation.getLocation() - start_pc - 1; |
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124 |
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125 check("local variable table entry start PC", start_pc); |
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126 |
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127 dout.writeShort(start_pc); |
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128 dout.writeShort(length); |
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129 dout.writeShort(name_index); |
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130 dout.writeShort(descriptor_index); |
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131 dout.writeShort(index); |
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132 } |
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133 } |
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134 } |
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135 |
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136 private void check(String type, int addr) throws RuntimeException { |
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137 if (addr < 0 || addr > 65535) { |
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138 throw new RuntimeException("Value for " + type + " out of " + |
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139 "valid range: " + addr); |
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140 } |
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141 } |
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142 |
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143 private void clean() { |
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144 if (mCleanEntries != null) { |
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145 return; |
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146 } |
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147 |
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148 // Clean out entries that are incomplete or bogus. |
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149 |
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150 int size = mEntries.size(); |
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151 mCleanEntries = new ArrayList(size); |
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152 mRangeCount = 0; |
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153 |
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154 outer: |
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155 for (int i=0; i<size; i++) { |
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156 Entry entry = (Entry)mEntries.get(i); |
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157 LocalVariable localVar = entry.mLocalVar; |
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158 |
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159 SortedSet ranges = localVar.getLocationRangeSet(); |
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160 if (ranges == null || ranges.size() == 0) { |
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161 continue; |
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162 } |
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163 |
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164 Iterator it = ranges.iterator(); |
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165 while (it.hasNext()) { |
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166 LocationRange range = (LocationRange)it.next(); |
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167 |
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168 Location startLocation = range.getStartLocation(); |
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169 Location endLocation = range.getEndLocation(); |
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170 |
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171 if (startLocation == null || endLocation == null) { |
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172 continue outer; |
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173 } |
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174 |
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175 int start_pc = startLocation.getLocation(); |
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176 int length = endLocation.getLocation() - start_pc - 1; |
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177 |
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178 if (length < 0) { |
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179 continue outer; |
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180 } |
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181 } |
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182 |
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183 mCleanEntries.add(entry); |
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184 mRangeCount += entry.getRangeCount(); |
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185 } |
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186 } |
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187 |
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188 static Attribute define(ConstantPool cp, |
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189 String name, |
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190 int length, |
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191 DataInput din) throws IOException { |
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192 |
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193 LocalVariableTableAttr locals = new LocalVariableTableAttr(cp); |
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194 |
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195 int size = din.readUnsignedShort(); |
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196 for (int i=0; i<size; i++) { |
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197 int start_pc = din.readUnsignedShort(); |
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198 int end_pc = start_pc + din.readUnsignedShort() + 1; |
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199 int name_index = din.readUnsignedShort(); |
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200 int descriptor_index = din.readUnsignedShort(); |
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201 final int index = din.readUnsignedShort(); |
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202 |
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203 final ConstantUTFInfo varName = |
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204 (ConstantUTFInfo)cp.getConstant(name_index); |
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205 final ConstantUTFInfo varDesc = |
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206 (ConstantUTFInfo)cp.getConstant(descriptor_index); |
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207 |
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208 final Location startLocation = new FixedLocation(start_pc); |
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209 final Location endLocation = new FixedLocation(end_pc); |
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210 |
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211 SortedSet ranges = new TreeSet(); |
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212 ranges.add(new LocationRangeImpl(startLocation, endLocation)); |
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213 final SortedSet fRanges = |
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214 Collections.unmodifiableSortedSet(ranges); |
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215 |
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216 LocalVariable localVar = new LocalVariable() { |
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217 private String mName; |
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218 private TypeDescriptor mType; |
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219 |
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220 { |
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221 mName = varName.getValue(); |
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222 mType = TypeDescriptor.parseTypeDesc(varDesc.getValue()); |
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223 } |
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224 |
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225 public String getName() { |
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226 return mName; |
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227 } |
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228 |
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229 public void setName(String name) { |
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230 mName = name; |
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231 } |
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232 |
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233 public TypeDescriptor getType() { |
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234 return mType; |
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235 } |
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236 |
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237 public boolean isDoubleWord() { |
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238 Class clazz = mType.getClassArg(); |
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239 return (clazz == double.class || clazz == long.class); |
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240 } |
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241 |
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242 public int getNumber() { |
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243 return index; |
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244 } |
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245 |
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246 public SortedSet getLocationRangeSet() { |
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247 return fRanges; |
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248 } |
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249 }; |
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250 |
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251 Entry entry = new Entry(localVar, varName, varDesc); |
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252 locals.mEntries.add(entry); |
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253 } |
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254 |
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255 return locals; |
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256 } |
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257 |
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258 private static class Entry { |
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259 public LocalVariable mLocalVar; |
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260 public ConstantUTFInfo mName; |
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261 public ConstantUTFInfo mDescriptor; |
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262 |
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263 public Entry(LocalVariable localVar, |
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264 ConstantUTFInfo name, ConstantUTFInfo descriptor) { |
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265 |
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266 mLocalVar = localVar; |
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267 mName = name; |
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268 mDescriptor = descriptor; |
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269 } |
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270 |
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271 public int getRangeCount() { |
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272 return mLocalVar.getLocationRangeSet().size(); |
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273 } |
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274 } |
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275 } |