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annotate jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/AbstractJavaProfile.java @ 24151:26a414946c56 jvmci-0.29

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Get host class of VM anonymous class (JDK-8182310)
author Doug Simon <doug.simon@oracle.com>
date Fri, 30 Jun 2017 17:09:57 +0200
parents 9e1235406b59
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 package jdk.vm.ci.meta;
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24
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25 /**
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26 * This object holds probability information for a set of items that were profiled at a specific
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27 * BCI. The precision of the supplied values may vary, but a runtime that provides this information
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28 * should be aware that it will be used to guide performance-critical decisions like speculative
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29 * inlining, etc.
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30 *
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31 * @param <T> a subclass of AbstractProfiledItem
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32 * @param <U> the class of the items that are profiled at the specific BCI and for which
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33 * probabilities are stored. E.g., a ResolvedJavaType or a ResolvedJavaMethod.
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34 */
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35 public abstract class AbstractJavaProfile<T extends AbstractProfiledItem<U>, U> {
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36
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37 private final double notRecordedProbability;
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38 private final T[] pitems;
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39
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40 /**
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41 *
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42 * @param notRecordedProbability
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43 * @param pitems
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44 */
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45 @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of the `pitems` array parameter")
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46 public AbstractJavaProfile(double notRecordedProbability, T[] pitems) {
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47 this.pitems = pitems;
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48 assert !Double.isNaN(notRecordedProbability);
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49 this.notRecordedProbability = notRecordedProbability;
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50 assert isSorted();
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51 assert totalProbablility() >= 0 && totalProbablility() <= 1.0001 : totalProbablility() + " " + this;
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52 }
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53
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54 private double totalProbablility() {
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55 double total = notRecordedProbability;
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56 for (T item : pitems) {
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57 total += item.probability;
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58 }
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59 return total;
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60 }
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61
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62 /**
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63 * Determines if an array of profiled items are sorted in descending order of their
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64 * probabilities.
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65 */
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66 private boolean isSorted() {
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67 for (int i = 1; i < pitems.length; i++) {
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68 if (pitems[i - 1].getProbability() < pitems[i].getProbability()) {
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69 return false;
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70 }
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71 }
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72 return true;
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73 }
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74
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75 /**
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76 * Returns the estimated probability of all types that could not be recorded due to profiling
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77 * limitations.
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78 *
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79 * @return double value &ge; 0.0 and &le; 1.0
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80 */
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81 public double getNotRecordedProbability() {
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82 return notRecordedProbability;
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83 }
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84
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85 protected T[] getItems() {
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86 return pitems;
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87 }
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88
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89 /**
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90 * Searches for an entry of a given resolved Java type.
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91 *
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92 * @param type the type for which an entry should be searched
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93 * @return the entry or null if no entry for this type can be found
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94 */
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95 public T findEntry(ResolvedJavaType type) {
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96 if (pitems != null) {
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97 for (T pt : pitems) {
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98 if (pt.getItem().equals(type)) {
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99 return pt;
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100 }
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101 }
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102 }
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103 return null;
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104 }
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105
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106 @Override
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107 public String toString() {
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108 StringBuilder builder = new StringBuilder();
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109 builder.append(this.getClass().getName());
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110 builder.append("[");
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111 if (pitems != null) {
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112 for (T pt : pitems) {
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113 builder.append(pt.toString());
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114 builder.append(", ");
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115 }
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116 }
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117 builder.append(this.notRecordedProbability);
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118 builder.append("]");
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119 return builder.toString();
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120 }
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121
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122 public boolean isIncluded(U item) {
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123 if (this.getNotRecordedProbability() > 0.0) {
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124 return true;
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125 } else {
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126 for (int i = 0; i < getItems().length; i++) {
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127 T pitem = getItems()[i];
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128 U curType = pitem.getItem();
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129 if (curType == item) {
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130 return true;
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131 }
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132 }
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133 }
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134 return false;
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135 }
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136
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137 @Override
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138 public boolean equals(Object obj) {
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139 if (obj == this) {
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140 return true;
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141 }
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142 if (!(obj instanceof AbstractJavaProfile)) {
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143 return false;
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144 }
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145 AbstractJavaProfile<?, ?> that = (AbstractJavaProfile<?, ?>) obj;
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146 if (that.notRecordedProbability != notRecordedProbability) {
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147 return false;
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148 }
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149 if (that.pitems.length != pitems.length) {
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150 return false;
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151 }
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152 for (int i = 0; i < pitems.length; ++i) {
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153 if (!pitems[i].equals(that.pitems[i])) {
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154 return false;
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155 }
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156 }
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157 return true;
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158 }
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159
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160 @Override
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161 public int hashCode() {
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162 return (int) Double.doubleToLongBits(notRecordedProbability) + pitems.length * 13;
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163 }
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164 }