Mercurial > hg > blitz_condensed
annotate src/com/go/trove/classfile/CodeAttr.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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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 Code_attribute structure as defined in |
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60 * section 4.7.4 of <i>The Java Virtual Machine Specification</i>. |
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61 * To make it easier to create bytecode for the CodeAttr, use the |
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62 * CodeBuilder. |
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63 * |
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64 * @author Brian S O'Neill |
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65 * @version |
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66 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/01/02 <!-- $--> |
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67 * @see Opcode |
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68 * @see CodeBuilder |
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69 */ |
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70 public class CodeAttr extends Attribute { |
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71 private CodeBuffer mCodeBuffer; |
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72 private List mAttributes = new ArrayList(2); |
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73 |
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74 private LineNumberTableAttr mLineNumberTable; |
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75 private LocalVariableTableAttr mLocalVariableTable; |
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76 |
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77 CodeAttr(ConstantPool cp) { |
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78 super(cp, CODE); |
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79 } |
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80 |
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81 /** |
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82 * Returns null if no CodeBuffer is defined for this CodeAttr. |
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83 */ |
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84 public CodeBuffer getCodeBuffer() { |
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85 return mCodeBuffer; |
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86 } |
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87 |
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88 public void setCodeBuffer(CodeBuffer code) { |
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89 mCodeBuffer = code; |
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90 } |
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91 |
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92 /** |
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93 * Returns the line number in the source code from the given bytecode |
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94 * address (start_pc). |
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95 * |
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96 * @return -1 if no line number is mapped for the start_pc. |
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97 */ |
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98 public int getLineNumber(Location start) { |
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99 if (mLineNumberTable == null || start.getLocation() < 0) { |
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100 return -1; |
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101 } |
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102 else { |
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103 return mLineNumberTable.getLineNumber(start); |
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104 } |
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105 } |
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106 |
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107 /** |
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108 * Map a bytecode address (start_pc) to a line number in the source code |
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109 * as a debugging aid. |
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110 */ |
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111 public void mapLineNumber(Location start, int line_number) { |
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112 if (mLineNumberTable == null) { |
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113 addAttribute(new LineNumberTableAttr(mCp)); |
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114 } |
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115 |
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116 mLineNumberTable.addEntry(start, line_number); |
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117 } |
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118 |
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119 /** |
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120 * Indicate a local variable's use information be recorded in the |
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121 * ClassFile as a debugging aid. If the LocalVariable doesn't provide |
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122 * both a start and end location, then its information is not recorded. |
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123 * This method should be called at most once per LocalVariable instance. |
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124 */ |
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125 public void localVariableUse(LocalVariable localVar) { |
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126 if (mLocalVariableTable == null) { |
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127 addAttribute(new LocalVariableTableAttr(mCp)); |
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128 } |
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129 |
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130 mLocalVariableTable.addEntry(localVar); |
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131 } |
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132 |
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133 public void addAttribute(Attribute attr) { |
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134 if (attr instanceof LineNumberTableAttr) { |
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135 if (mLineNumberTable != null) { |
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136 mAttributes.remove(mLineNumberTable); |
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137 } |
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138 mLineNumberTable = (LineNumberTableAttr)attr; |
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139 } |
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140 else if (attr instanceof LocalVariableTableAttr) { |
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141 if (mLocalVariableTable != null) { |
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142 mAttributes.remove(mLocalVariableTable); |
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143 } |
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144 mLocalVariableTable = (LocalVariableTableAttr)attr; |
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145 } |
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146 |
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147 mAttributes.add(attr); |
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148 } |
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149 |
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150 public Attribute[] getAttributes() { |
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151 Attribute[] attrs = new Attribute[mAttributes.size()]; |
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152 return (Attribute[])mAttributes.toArray(attrs); |
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153 } |
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154 |
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155 /** |
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156 * Returns the length (in bytes) of this object in the class file. |
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157 */ |
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158 public int getLength() { |
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159 int length = 12; |
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160 |
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161 if (mCodeBuffer != null) { |
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162 length += mCodeBuffer.getByteCodes().length; |
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163 ExceptionHandler[] handlers = mCodeBuffer.getExceptionHandlers(); |
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164 if (handlers != null) { |
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165 length += 8 * handlers.length; |
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166 } |
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167 } |
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168 |
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169 int size = mAttributes.size(); |
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170 for (int i=0; i<size; i++) { |
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171 length += ((Attribute)mAttributes.get(i)).getLength(); |
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172 length += 6; // attributes have an intial 6 byte length |
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173 } |
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174 |
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175 return length; |
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176 } |
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177 |
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178 public void writeDataTo(DataOutput dout) throws IOException { |
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179 if (mCodeBuffer == null) { |
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180 throw new NullPointerException("CodeAttr has no CodeBuffer set"); |
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181 } |
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182 |
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183 ExceptionHandler[] handlers = mCodeBuffer.getExceptionHandlers(); |
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184 |
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185 dout.writeShort(mCodeBuffer.getMaxStackDepth()); |
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186 dout.writeShort(mCodeBuffer.getMaxLocals()); |
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187 |
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188 byte[] byteCodes = mCodeBuffer.getByteCodes(); |
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189 dout.writeInt(byteCodes.length); |
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190 dout.write(byteCodes); |
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191 |
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192 if (handlers != null) { |
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193 int exceptionHandlerCount = handlers.length; |
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194 dout.writeShort(exceptionHandlerCount); |
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195 |
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196 for (int i=0; i<exceptionHandlerCount; i++) { |
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197 handlers[i].writeTo(dout); |
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198 } |
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199 } |
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200 else { |
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201 dout.writeShort(0); |
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202 } |
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203 |
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204 int size = mAttributes.size(); |
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205 dout.writeShort(size); |
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206 for (int i=0; i<size; i++) { |
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207 Attribute attr = (Attribute)mAttributes.get(i); |
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208 attr.writeTo(dout); |
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209 } |
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210 } |
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211 |
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212 static Attribute define(ConstantPool cp, |
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213 String name, |
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214 int length, |
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215 DataInput din, |
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216 AttributeFactory attrFactory) |
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217 throws IOException |
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218 { |
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219 CodeAttr code = new CodeAttr(cp); |
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220 |
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221 final int maxStackDepth = din.readUnsignedShort(); |
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222 final int maxLocals = din.readUnsignedShort(); |
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223 |
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224 final byte[] byteCodes = new byte[din.readInt()]; |
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225 din.readFully(byteCodes); |
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226 |
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227 int exceptionHandlerCount = din.readUnsignedShort(); |
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228 final ExceptionHandler[] handlers = |
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229 new ExceptionHandler[exceptionHandlerCount]; |
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230 |
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231 for (int i=0; i<exceptionHandlerCount; i++) { |
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232 handlers[i] = ExceptionHandler.readFrom(cp, din); |
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233 } |
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234 |
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235 code.mCodeBuffer = new CodeBuffer() { |
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236 public int getMaxStackDepth() { |
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237 return maxStackDepth; |
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238 } |
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239 |
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240 public int getMaxLocals() { |
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241 return maxLocals; |
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242 } |
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243 |
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244 public byte[] getByteCodes() { |
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245 return (byte[])byteCodes.clone(); |
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246 } |
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247 |
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248 public ExceptionHandler[] getExceptionHandlers() { |
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249 return (ExceptionHandler[])handlers.clone(); |
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250 } |
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251 }; |
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252 |
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253 int attributeCount = din.readUnsignedShort(); |
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254 for (int i=0; i<attributeCount; i++) { |
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255 code.addAttribute(Attribute.readFrom(cp, din, attrFactory)); |
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256 } |
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257 |
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258 return code; |
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259 } |
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260 } |