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annotate agent/src/share/classes/sun/jvm/hotspot/code/ScopeDesc.java @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents c18cbe5936b8
children
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1 /*
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.code;
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26
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27 import java.io.*;
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28 import java.util.*;
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29
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.oops.*;
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32 import sun.jvm.hotspot.runtime.*;
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33 import sun.jvm.hotspot.utilities.*;
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34
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35 /** ScopeDescs contain the information that makes source-level
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36 debugging of nmethods possible; each scopeDesc describes a method
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37 activation */
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38
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39 public class ScopeDesc {
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40 /** NMethod information */
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41 private NMethod code;
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42 private Method method;
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43 private int bci;
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44 private boolean reexecute;
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45 /** Decoding offsets */
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46 private int decodeOffset;
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47 private int senderDecodeOffset;
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48 private int localsDecodeOffset;
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49 private int expressionsDecodeOffset;
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50 private int monitorsDecodeOffset;
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51 /** Scalar replaced bjects pool */
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52 private List objects; // ArrayList<ScopeValue>
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53
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54 private ScopeDesc(NMethod code, int decodeOffset, List objects, boolean reexecute) {
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55 this.code = code;
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56 this.decodeOffset = decodeOffset;
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57 this.objects = objects;
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58 this.reexecute = reexecute;
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59
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60 // Decode header
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61 DebugInfoReadStream stream = streamAt(decodeOffset);
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62
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63 senderDecodeOffset = stream.readInt();
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64 method = stream.readMethod();
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65 bci = stream.readBCI();
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66 // Decode offsets for body and sender
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67 localsDecodeOffset = stream.readInt();
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68 expressionsDecodeOffset = stream.readInt();
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69 monitorsDecodeOffset = stream.readInt();
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70 }
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71
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72 public ScopeDesc(NMethod code, int decodeOffset, int objectDecodeOffset, boolean reexecute) {
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73 this.code = code;
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74 this.decodeOffset = decodeOffset;
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75 this.objects = decodeObjectValues(objectDecodeOffset);
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76 this.reexecute = reexecute;
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77
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78 // Decode header
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79 DebugInfoReadStream stream = streamAt(decodeOffset);
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80
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81 senderDecodeOffset = stream.readInt();
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82 method = stream.readMethod();
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83 bci = stream.readBCI();
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84 // Decode offsets for body and sender
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85 localsDecodeOffset = stream.readInt();
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86 expressionsDecodeOffset = stream.readInt();
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87 monitorsDecodeOffset = stream.readInt();
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88 }
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89
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90 public NMethod getNMethod() { return code; }
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91 public Method getMethod() { return method; }
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92 public int getBCI() { return bci; }
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93 public boolean getReexecute() { return reexecute;}
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94
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95 /** Returns a List&lt;ScopeValue&gt; */
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96 public List getLocals() {
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97 return decodeScopeValues(localsDecodeOffset);
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98 }
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99
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100 /** Returns a List&lt;ScopeValue&gt; */
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101 public List getExpressions() {
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102 return decodeScopeValues(expressionsDecodeOffset);
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103 }
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104
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105 /** Returns a List&lt;MonitorValue&gt; */
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106 public List getMonitors() {
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107 return decodeMonitorValues(monitorsDecodeOffset);
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108 }
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109
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110 /** Returns a List&lt;ObjectValue&gt; */
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111 public List getObjects() {
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112 return objects;
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113 }
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114
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115 /** Stack walking. Returns null if this is the outermost scope. */
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116 public ScopeDesc sender() {
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117 if (isTop()) {
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118 return null;
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119 }
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120
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121 return new ScopeDesc(code, senderDecodeOffset, objects, false);
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122 }
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123
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124 /** Returns where the scope was decoded */
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125 public int getDecodeOffset() {
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126 return decodeOffset;
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127 }
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128
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129 /** Tells whether sender() returns null */
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130 public boolean isTop() {
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131 return (senderDecodeOffset == DebugInformationRecorder.SERIALIZED_NULL);
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132 }
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133
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134 public boolean equals(Object arg) {
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135 if (arg == null) {
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136 return false;
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137 }
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138
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139 if (!(arg instanceof ScopeDesc)) {
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140 return false;
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141 }
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142
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143 ScopeDesc sd = (ScopeDesc) arg;
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144
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145 return (sd.method.equals(method) && (sd.bci == bci));
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146 }
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147
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148 public void printValue() {
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149 printValueOn(System.out);
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150 }
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151
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152 public void printValueOn(PrintStream tty) {
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153 tty.print("ScopeDesc for ");
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154 method.printValueOn(tty);
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155 tty.print(" @bci " + bci);
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156 tty.println(" reexecute=" + reexecute);
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157 }
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158
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159 // FIXME: add more accessors
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160
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161 //--------------------------------------------------------------------------------
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162 // Internals only below this point
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163 //
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164 private DebugInfoReadStream streamAt(int decodeOffset) {
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165 return new DebugInfoReadStream(code, decodeOffset, objects);
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166 }
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167
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168 /** Returns a List&lt;ScopeValue&gt; or null if no values were present */
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169 private List decodeScopeValues(int decodeOffset) {
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170 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) {
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171 return null;
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172 }
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173 DebugInfoReadStream stream = streamAt(decodeOffset);
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174 int length = stream.readInt();
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175 List res = new ArrayList(length);
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176 for (int i = 0; i < length; i++) {
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177 res.add(ScopeValue.readFrom(stream));
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178 }
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179 return res;
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180 }
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181
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182 /** Returns a List&lt;MonitorValue&gt; or null if no values were present */
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183 private List decodeMonitorValues(int decodeOffset) {
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184 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) {
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185 return null;
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186 }
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187 DebugInfoReadStream stream = streamAt(decodeOffset);
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188 int length = stream.readInt();
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189 List res = new ArrayList(length);
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190 for (int i = 0; i < length; i++) {
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191 res.add(new MonitorValue(stream));
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192 }
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193 return res;
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194 }
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195
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196 /** Returns a List&lt;ObjectValue&gt; or null if no values were present */
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197 private List decodeObjectValues(int decodeOffset) {
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198 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) {
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199 return null;
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200 }
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201 List res = new ArrayList();
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202 DebugInfoReadStream stream = new DebugInfoReadStream(code, decodeOffset, res);
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203 int length = stream.readInt();
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204 for (int i = 0; i < length; i++) {
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205 // Objects values are pushed to 'res' array during read so that
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206 // object's fields could reference it (OBJECT_ID_CODE).
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207 ScopeValue.readFrom(stream);
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208 // res.add(ScopeValue.readFrom(stream));
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209 }
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210 Assert.that(res.size() == length, "inconsistent debug information");
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211 return res;
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212 }
0
a61af66fc99e Initial load
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213 }