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annotate test/runtime/contended/Basic.java @ 12235:d6c266999345

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8023476: Metaspace capacity > reserved Reviewed-by: stefank, hseigel, mgerdin
author ehelin
date Thu, 12 Sep 2013 10:15:30 +0200
parents 5e3573e08a83
children
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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 8003985
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44 * @summary Support Contended Annotation - JEP 142
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45 *
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46 * @run main/othervm -XX:-RestrictContended Basic
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47 */
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48 public class Basic {
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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.getDeclaredField(field1);
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84 Field f2 = klass.getDeclaredField(field2);
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85
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86 if (isStatic(f1) != isStatic(f2)) {
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87 return true; // these guys are in naturally disjoint locations
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88 }
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89
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90 int diff = offset(f1) - offset(f2);
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91 if (diff < 0) {
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92 // f1 is first
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93 return (offset(f2) - (offset(f1) + getSize(f1))) > 64;
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94 } else {
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95 // f2 is first
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96 return (offset(f1) - (offset(f2) + getSize(f2))) > 64;
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97 }
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98 }
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99
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100 public static boolean isPadded(Class klass, String field1) throws Exception {
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101 Field f1 = klass.getDeclaredField(field1);
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102
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103 if (isStatic(f1)) {
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104 return offset(f1) > 128 + 64;
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105 }
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106
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107 return offset(f1) > 64;
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108 }
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109
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110 public static boolean sameLayout(Class klass1, Class klass2) throws Exception {
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111 for (Field f1 : klass1.getDeclaredFields()) {
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112 Field f2 = klass2.getDeclaredField(f1.getName());
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113 if (offset(f1) != offset(f2)) {
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114 return false;
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115 }
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116 }
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117
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118 for (Field f2 : klass1.getDeclaredFields()) {
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119 Field f1 = klass2.getDeclaredField(f2.getName());
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120 if (offset(f1) != offset(f2)) {
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121 return false;
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122 }
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123 }
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124
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125 return true;
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126 }
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127
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128 public static boolean isStatic(Field field) {
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129 return Modifier.isStatic(field.getModifiers());
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130 }
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131
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132 public static int offset(Field field) {
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133 if (isStatic(field)) {
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134 return (int) U.staticFieldOffset(field);
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135 } else {
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136 return (int) U.objectFieldOffset(field);
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137 }
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138 }
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139
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140 public static int getSize(Field field) {
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141 Class type = field.getType();
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142 if (type == byte.class) { return 1; }
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143 if (type == boolean.class) { return 1; }
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144 if (type == short.class) { return 2; }
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145 if (type == char.class) { return 2; }
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146 if (type == int.class) { return 4; }
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147 if (type == float.class) { return 4; }
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148 if (type == long.class) { return 8; }
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149 if (type == double.class) { return 8; }
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150 return ADDRESS_SIZE;
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151 }
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152
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153 public static void main(String[] args) throws Exception {
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154 boolean endResult = true;
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155
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156 // --------------- INSTANCE FIELDS ---------------------
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157
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158 if (arePaddedPairwise(Test1.class, "int1", "int2") ||
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159 isPadded(Test1.class, "int1") ||
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160 isPadded(Test1.class, "int2")) {
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161 System.err.println("Test1 failed");
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162 endResult &= false;
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163 }
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164
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165 if (!arePaddedPairwise(Test2.class, "int1", "int2") ||
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166 !isPadded(Test2.class, "int1") ||
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167 isPadded(Test2.class, "int2")) {
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168 System.err.println("Test2 failed");
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169 endResult &= false;
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170 }
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171
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172 if (!arePaddedPairwise(Test3.class, "int1", "int2") ||
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173 !isPadded(Test3.class, "int1") ||
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174 !isPadded(Test3.class, "int2")) {
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175 System.err.println("Test3 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(Test4.class, "int1", "int2") ||
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180 !isPadded(Test4.class, "int1") ||
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181 !isPadded(Test4.class, "int2")) {
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182 System.err.println("Test4 failed");
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183 endResult &= false;
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184 }
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185
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186 if (!arePaddedPairwise(Test5.class, "int1", "int2") ||
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187 !isPadded(Test5.class, "int1") ||
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188 !isPadded(Test5.class, "int2")) {
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189 System.err.println("Test5 failed");
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190 endResult &= false;
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191 }
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192
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193 if (!arePaddedPairwise(Test6.class, "int1", "int2") ||
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194 !isPadded(Test6.class, "int1") ||
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195 !isPadded(Test6.class, "int2")) {
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196 System.err.println("Test6 failed");
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197 endResult &= false;
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198 }
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199
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200 if (arePaddedPairwise(Test7.class, "int1", "int2") ||
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201 !isPadded(Test7.class, "int1") ||
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202 !isPadded(Test7.class, "int2")) {
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203 System.err.println("Test7 failed");
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204 endResult &= false;
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205 }
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206
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207 if (!arePaddedPairwise(Test8.class, "int1", "int2") ||
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208 !isPadded(Test8.class, "int1") ||
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209 !isPadded(Test8.class, "int2")) {
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210 System.err.println("Test8 failed");
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211 endResult &= false;
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212 }
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213
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214 if (!arePaddedPairwise(Test9.class, "int1", "int2") ||
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215 !isPadded(Test9.class, "int1") ||
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216 !isPadded(Test9.class, "int2")) {
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217 System.err.println("Test9 failed");
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218 endResult &= false;
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219 }
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220
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221 if (!sameLayout(Test4.class, Test7.class)) {
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222 System.err.println("Test4 and Test7 have different layouts");
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223 endResult &= false;
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224 }
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225
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226 if (!sameLayout(Test5.class, Test6.class)) {
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227 System.err.println("Test5 and Test6 have different layouts");
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228 endResult &= false;
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229 }
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230
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231 if (!sameLayout(Test8.class, Test9.class)) {
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232 System.err.println("Test8 and Test9 have different layouts");
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233 endResult &= false;
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234 }
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235
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236 System.out.println(endResult ? "Test PASSES" : "Test FAILS");
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237 if (!endResult) {
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238 throw new Error("Test failed");
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239 }
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240 }
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241
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242 // ----------------------------------- INSTANCE FIELDS -----------------------------------------
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243
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244 // naturally packed
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245 public static class Test1 {
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246 private int int1;
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247 private int int2;
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248 }
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249
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250 // int1 is padded
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251 public static class Test2 {
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252 @Contended private int int1;
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253 private int int2;
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254 }
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255
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256 // both fields are padded
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257 public static class Test3 {
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258 @Contended private int int1;
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259 @Contended private int int2;
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260 }
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261
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262 // fields are padded in the singular group
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263 public static class Test4 {
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264 @Contended("sameGroup") private int int1;
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265 @Contended("sameGroup") private int int2;
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266 }
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267
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268 // fields are padded in disjoint groups
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269 public static class Test5 {
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270 @Contended("diffGroup1") private int int1;
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271 @Contended("diffGroup2") private int int2;
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272 }
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273
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274 // fields are padded in disjoint groups
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275 public static class Test6 {
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276 @Contended private int int1;
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277 @Contended("diffGroup2") private int int2;
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278 }
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279
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280 // fields are padded in the singular group
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281 @Contended
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282 public static class Test7 {
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283 private int int1;
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284 private int int2;
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285 }
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286
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287 // all fields are padded as the group, and one field is padded specifically
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288 @Contended
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289 public static class Test8 {
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290 @Contended private int int1;
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291 private int int2;
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292 }
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293
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294 // all fields are padded as the group, and one field is padded specifically
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295 @Contended
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296 public static class Test9 {
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297 @Contended("group") private int int1;
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298 private int int2;
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299 }
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300
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301 }
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302