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annotate test/runtime/contended/Inheritance1.java @ 10374:87c64c0438fb

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6976350: G1: deal with fragmentation while copying objects during GC Summary: Create G1ParGCAllocBufferContainer to contain two buffers instead of previously using one buffer, in order to hold the first priority buffer longer. Thus, when some large objects hits the value of free space left in the first priority buffer it has an alternative to fit in the second priority buffer while the first priority buffer is given more chances to try allocating smaller objects. Overall, it will improve heap space efficiency. Reviewed-by: johnc, jmasa, brutisso Contributed-by: tamao <tao.mao@oracle.com>
author tamao
date Mon, 03 Jun 2013 14:37:13 -0700
parents 205dd30230e1
children
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10303
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1 /*
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2 * Copyright (c) 2013, 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 import java.io.BufferedReader;
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25 import java.io.InputStreamReader;
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26 import java.lang.Class;
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27 import java.lang.String;
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28 import java.lang.System;
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29 import java.lang.management.ManagementFactory;
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30 import java.lang.management.RuntimeMXBean;
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31 import java.util.ArrayList;
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32 import java.util.List;
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33 import java.util.concurrent.CyclicBarrier;
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34 import java.util.regex.Matcher;
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35 import java.util.regex.Pattern;
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36 import java.lang.reflect.Field;
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37 import java.lang.reflect.Modifier;
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38 import sun.misc.Unsafe;
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39 import sun.misc.Contended;
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40
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41 /*
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42 * @test
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43 * @bug 8012939
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44 * @summary \@Contended doesn't work correctly with inheritance
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45 *
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46 * @run main/othervm -XX:-RestrictContended Inheritance1
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47 */
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48 public class Inheritance1 {
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49
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50 private static final Unsafe U;
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51 private static int ADDRESS_SIZE;
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52 private static int HEADER_SIZE;
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53
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54 static {
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55 // steal Unsafe
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56 try {
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57 Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");
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58 unsafe.setAccessible(true);
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59 U = (Unsafe) unsafe.get(null);
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60 } catch (NoSuchFieldException | IllegalAccessException e) {
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61 throw new IllegalStateException(e);
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62 }
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63
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64 // When running with CompressedOops on 64-bit platform, the address size
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65 // reported by Unsafe is still 8, while the real reference fields are 4 bytes long.
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66 // Try to guess the reference field size with this naive trick.
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67 try {
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68 long off1 = U.objectFieldOffset(CompressedOopsClass.class.getField("obj1"));
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69 long off2 = U.objectFieldOffset(CompressedOopsClass.class.getField("obj2"));
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70 ADDRESS_SIZE = (int) Math.abs(off2 - off1);
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71 HEADER_SIZE = (int) Math.min(off1, off2);
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72 } catch (NoSuchFieldException e) {
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73 ADDRESS_SIZE = -1;
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74 }
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75 }
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76
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77 static class CompressedOopsClass {
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78 public Object obj1;
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79 public Object obj2;
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80 }
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81
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82 public static boolean arePaddedPairwise(Class klass, String field1, String field2) throws Exception {
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83 Field f1 = klass.getField(field1);
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84 Field f2 = klass.getField(field2);
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85
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86 int diff = offset(f1) - offset(f2);
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87 if (diff < 0) {
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88 // f1 is first
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89 return (offset(f2) - (offset(f1) + getSize(f1))) > 64;
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90 } else {
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91 // f2 is first
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92 return (offset(f1) - (offset(f2) + getSize(f2))) > 64;
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93 }
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94 }
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95
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96 public static boolean sameLayout(Class klass1, Class klass2) throws Exception {
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97 for (Field f1 : klass1.getDeclaredFields()) {
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98 Field f2 = klass2.getDeclaredField(f1.getName());
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99 if (offset(f1) != offset(f2)) {
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100 return false;
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101 }
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102 }
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103
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104 for (Field f2 : klass1.getDeclaredFields()) {
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105 Field f1 = klass2.getDeclaredField(f2.getName());
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106 if (offset(f1) != offset(f2)) {
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107 return false;
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108 }
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109 }
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110
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111 return true;
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112 }
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113
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114 public static boolean isStatic(Field field) {
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115 return Modifier.isStatic(field.getModifiers());
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116 }
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117
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118 public static int offset(Field field) {
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119 if (isStatic(field)) {
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120 return (int) U.staticFieldOffset(field);
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121 } else {
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122 return (int) U.objectFieldOffset(field);
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123 }
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124 }
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125
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126 public static int getSize(Field field) {
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127 Class type = field.getType();
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128 if (type == byte.class) { return 1; }
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129 if (type == boolean.class) { return 1; }
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130 if (type == short.class) { return 2; }
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131 if (type == char.class) { return 2; }
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132 if (type == int.class) { return 4; }
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133 if (type == float.class) { return 4; }
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134 if (type == long.class) { return 8; }
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135 if (type == double.class) { return 8; }
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136 return ADDRESS_SIZE;
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137 }
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138
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139 public static void main(String[] args) throws Exception {
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140 boolean endResult = true;
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141
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142 // --------------- INSTANCE FIELDS ---------------------
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143
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144 if (!arePaddedPairwise(A2_R1.class, "int1", "int2")) {
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145 System.err.println("A2_R1 failed");
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146 endResult &= false;
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147 }
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148
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149 if (!arePaddedPairwise(A3_R1.class, "int1", "int2")) {
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150 System.err.println("A3_R1 failed");
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151 endResult &= false;
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152 }
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153
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154 if (!arePaddedPairwise(A1_R2.class, "int1", "int2")) {
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155 System.err.println("A1_R2 failed");
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156 endResult &= false;
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157 }
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158
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159 if (!arePaddedPairwise(A2_R2.class, "int1", "int2")) {
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160 System.err.println("A2_R2 failed");
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161 endResult &= false;
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162 }
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163
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164 if (!arePaddedPairwise(A3_R2.class, "int1", "int2")) {
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165 System.err.println("A3_R2 failed");
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166 endResult &= false;
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167 }
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168
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169 if (!arePaddedPairwise(A1_R3.class, "int1", "int2")) {
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170 System.err.println("A1_R3 failed");
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171 endResult &= false;
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172 }
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173
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174 if (!arePaddedPairwise(A2_R3.class, "int1", "int2")) {
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175 System.err.println("A2_R3 failed");
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176 endResult &= false;
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177 }
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178
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179 if (!arePaddedPairwise(A3_R3.class, "int1", "int2")) {
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180 System.err.println("A3_R3 failed");
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181 endResult &= false;
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182 }
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183
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184 System.out.println(endResult ? "Test PASSES" : "Test FAILS");
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185 if (!endResult) {
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186 throw new Error("Test failed");
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187 }
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188 }
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189
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190 public static class R1 {
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191 public int int1;
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192 }
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193
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194 public static class R2 {
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195 @Contended
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196 public int int1;
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197 }
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198
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199 @Contended
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200 public static class R3 {
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201 public int int1;
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202 }
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203
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204 public static class A1_R1 extends R1 {
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205 public int int2;
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206 }
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207
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208 public static class A2_R1 extends R1 {
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209 @Contended
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210 public int int2;
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211 }
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212
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213 @Contended
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214 public static class A3_R1 extends R1 {
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215 public int int2;
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216 }
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217
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218 public static class A1_R2 extends R2 {
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219 public int int2;
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220 }
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221
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222 public static class A2_R2 extends R2 {
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223 @Contended
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224 public int int2;
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225 }
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226
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227 @Contended
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228 public static class A3_R2 extends R2 {
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229 public int int2;
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230 }
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231
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232 public static class A1_R3 extends R3 {
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233 public int int2;
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234 }
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235
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236 public static class A2_R3 extends R3 {
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237 @Contended
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238 public int int2;
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239 }
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240
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241 @Contended
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242 public static class A3_R3 extends R3 {
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243 public int int2;
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244 }
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245
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246
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247 }
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248