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annotate test/runtime/contended/DefaultValue.java @ 20074:a7ee2e1f0d4e

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remove UnboxNodes without usages (if object is non-null)
author Lukas Stadler <lukas.stadler@oracle.com>
date Mon, 30 Mar 2015 13:59:59 +0200
parents 50e9396d5257
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 8014509
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44 * @summary \@Contended: explicit default value behaves differently from the implicit value
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45 *
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46 * @run main/othervm -XX:-RestrictContended DefaultValue
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47 */
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48 public class DefaultValue {
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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 if (!arePaddedPairwise(R1.class, "int1", "int2")) {
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143 System.err.println("R1 failed");
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144 endResult &= false;
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145 }
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146
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147 if (!arePaddedPairwise(R2.class, "int1", "int2")) {
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148 System.err.println("R2 failed");
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149 endResult &= false;
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150 }
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151
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152 if (!arePaddedPairwise(R3.class, "int1", "int2")) {
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153 System.err.println("R3 failed");
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154 endResult &= false;
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155 }
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156
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157 System.out.println(endResult ? "Test PASSES" : "Test FAILS");
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158 if (!endResult) {
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159 throw new Error("Test failed");
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160 }
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161 }
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162
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163 public static class R1 {
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164 @Contended
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165 public int int1;
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166 @Contended
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167 public int int2;
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168 }
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169
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170 public static class R2 {
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171 @Contended("")
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172 public int int1;
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173 @Contended("")
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174 public int int2;
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175 }
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176
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177 public static class R3 {
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178 @Contended()
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179 public int int1;
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180 @Contended()
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181 public int int2;
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182 }
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183
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184 }
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185