Mercurial > hg > blitz_stable

annotate src/com/go/trove/classfile/LineNumberTableAttr.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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.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 }