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annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/AbstractJavaProfile.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/AbstractJavaProfile.java@082417ac43e4
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 com.oracle.jvmci.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 public AbstractJavaProfile(double notRecordedProbability, T[] pitems) {
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41 this.pitems = pitems;
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42 assert !Double.isNaN(notRecordedProbability);
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43 this.notRecordedProbability = notRecordedProbability;
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44 assert isSorted();
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45 assert totalProbablility() >= 0 && totalProbablility() <= 1.0001 : totalProbablility() + " " + this;
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46 }
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47
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48 private double totalProbablility() {
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49 double total = notRecordedProbability;
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50 for (T item : pitems) {
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51 total += item.probability;
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52 }
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53 return total;
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54 }
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55
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56 /**
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57 * Determines if an array of profiled items are sorted in descending order of their
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58 * probabilities.
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59 */
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60 private boolean isSorted() {
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61 for (int i = 1; i < pitems.length; i++) {
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62 if (pitems[i - 1].getProbability() < pitems[i].getProbability()) {
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63 return false;
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64 }
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65 }
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66 return true;
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67 }
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68
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69 /**
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70 * Returns the estimated probability of all types that could not be recorded due to profiling
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71 * limitations.
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72 *
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73 * @return double value &ge; 0.0 and &le; 1.0
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74 */
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75 public double getNotRecordedProbability() {
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76 return notRecordedProbability;
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77 }
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78
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79 protected T[] getItems() {
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80 return pitems;
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81 }
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82
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83 /**
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84 * Searches for an entry of a given resolved Java type.
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85 *
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86 * @param type the type for which an entry should be searched
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87 * @return the entry or null if no entry for this type can be found
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88 */
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89 public T findEntry(ResolvedJavaType type) {
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90 if (pitems != null) {
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91 for (T pt : pitems) {
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92 if (pt.getItem().equals(type)) {
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93 return pt;
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94 }
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95 }
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96 }
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97 return null;
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98 }
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99
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100 @Override
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101 public String toString() {
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102 StringBuilder builder = new StringBuilder();
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103 builder.append(this.getClass().getName());
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104 builder.append("[");
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105 if (pitems != null) {
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106 for (T pt : pitems) {
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107 builder.append(pt.toString());
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108 builder.append(", ");
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109 }
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110 }
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111 builder.append(this.notRecordedProbability);
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112 builder.append("]");
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113 return builder.toString();
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114 }
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115
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116 public boolean isIncluded(U item) {
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117 if (this.getNotRecordedProbability() > 0.0) {
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118 return true;
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119 } else {
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120 for (int i = 0; i < getItems().length; i++) {
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121 T pitem = getItems()[i];
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122 U curType = pitem.getItem();
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123 if (curType == item) {
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124 return true;
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125 }
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126 }
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127 }
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128 return false;
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129 }
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130
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131 @Override
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132 public boolean equals(Object obj) {
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133 if (obj == this) {
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134 return true;
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135 }
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136 if (!(obj instanceof AbstractJavaProfile)) {
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137 return false;
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138 }
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139 AbstractJavaProfile<?, ?> that = (AbstractJavaProfile<?, ?>) obj;
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140 if (that.notRecordedProbability != notRecordedProbability) {
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141 return false;
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142 }
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143 if (that.pitems.length != pitems.length) {
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144 return false;
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145 }
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146 for (int i = 0; i < pitems.length; ++i) {
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147 if (!pitems[i].equals(that.pitems[i])) {
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148 return false;
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149 }
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150 }
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151 return true;
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152 }
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153
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154 @Override
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155 public int hashCode() {
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156 return (int) Double.doubleToLongBits(notRecordedProbability) + pitems.length * 13;
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157 }
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158 }