Mercurial > hg > blitz_stable

annotate src/com/go/trove/classfile/ExceptionHandler.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
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0
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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.io.*;
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56
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57 /******************************************************************************
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58 * This class corresponds to the exception_table structure as defined in
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59 * section 4.7.4 of <i>The Java Virtual Machine Specification</i>.
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60 *
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61 * @author Brian S O'Neill
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62 * @version
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63 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
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64 */
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65 public class ExceptionHandler implements LocationRange {
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66 private Location mStart;
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67 private Location mEnd;
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68 private Location mCatch;
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69 private ConstantClassInfo mCatchType;
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70
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71 /**
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72 * @param startLocation
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73 * @param endLocation
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74 * @param catchLocation
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75 * @param catchType if null, then catch every object.
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76 */
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77 public ExceptionHandler(Location startLocation,
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78 Location endLocation,
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79 Location catchLocation,
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80 ConstantClassInfo catchType) {
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81 mStart = startLocation;
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82 mEnd = endLocation;
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83 mCatch = catchLocation;
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84 mCatchType = catchType;
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85 }
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86
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87 public Location getStartLocation() {
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88 return mStart;
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89 }
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90
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91 public Location getEndLocation() {
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92 return mEnd;
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93 }
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94
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95 public Location getCatchLocation() {
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96 return mCatch;
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97 }
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98
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99 /**
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100 * Returns null if every object is caught by this handler.
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101 */
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102 public ConstantClassInfo getCatchType() {
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103 return mCatchType;
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104 }
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105
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106 public int compareTo(Object obj) {
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107 if (this == obj) {
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108 return 0;
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109 }
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110
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111 LocationRange other = (LocationRange)obj;
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112
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113 int result = getStartLocation().compareTo(other.getStartLocation());
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114
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115 if (result == 0) {
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116 result = getEndLocation().compareTo(other.getEndLocation());
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117 }
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118
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119 if (result == 0 && obj instanceof ExceptionHandler) {
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120 result = getCatchLocation().compareTo
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121 (((ExceptionHandler)other).getCatchLocation());
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122 }
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123
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124 return result;
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125 }
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126
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127 public void writeTo(DataOutput dout) throws IOException {
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128 int start_pc = getStartLocation().getLocation();
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129 int end_pc = getEndLocation().getLocation();
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130 int handler_pc = getCatchLocation().getLocation();
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131 int catch_type;
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132 ConstantClassInfo catchType = getCatchType();
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133 if (catchType == null) {
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134 catch_type = 0;
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135 }
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136 else {
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137 catch_type = catchType.getIndex();
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138 }
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139
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140 check("exception start PC", start_pc);
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141 check("exception end PC", end_pc);
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142 check("exception handler PC", handler_pc);
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143
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144 dout.writeShort(start_pc);
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145 dout.writeShort(end_pc);
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146 dout.writeShort(handler_pc);
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147 dout.writeShort(catch_type);
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148 }
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149
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150 private void check(String type, int addr) throws RuntimeException {
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151 if (addr < 0 || addr > 65535) {
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152 throw new RuntimeException("Value for " + type + " out of " +
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153 "valid range: " + addr);
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154
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155 }
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156 }
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157
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158 static ExceptionHandler readFrom(ConstantPool cp,
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159 DataInput din) throws IOException {
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160 int start_pc = din.readUnsignedShort();
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161 int end_pc = din.readUnsignedShort();
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162 int handler_pc = din.readUnsignedShort();
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163 int catch_type = din.readUnsignedShort();
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164
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165 ConstantClassInfo catchTypeConstant;
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166 if (catch_type == 0) {
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167 catchTypeConstant = null;
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168 }
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169 else {
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170 catchTypeConstant = (ConstantClassInfo)cp.getConstant(catch_type);
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171 }
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172
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173 return new ExceptionHandler(new FixedLocation(start_pc),
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174 new FixedLocation(end_pc),
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175 new FixedLocation(handler_pc),
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176 catchTypeConstant);
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177 }
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178 }