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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMethodDataAccessor.java @ 24167:ac6f03d5b89e

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Added tag jvmci-0.32 for changeset dad95e57f1de
author Doug Simon <doug.simon@oracle.com>
date Mon, 14 Aug 2017 21:19:49 +0200
parents a52d7039723b
children
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1 /*
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2 * Copyright (c) 2012, 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.hotspot;
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24
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25 import jdk.vm.ci.meta.JavaMethodProfile;
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26 import jdk.vm.ci.meta.JavaTypeProfile;
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27 import jdk.vm.ci.meta.ProfilingInfo;
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28 import jdk.vm.ci.meta.TriState;
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29
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30 /**
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31 * Base class for accessing the different kinds of data in a HotSpot {@code MethodData}. This is
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32 * similar to {@link ProfilingInfo}, but most methods require a {@link HotSpotMethodData} and the
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33 * exact position within the method data.
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34 */
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35 abstract class HotSpotMethodDataAccessor {
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36
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37 final int tag;
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38 final int staticSize;
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39 final HotSpotVMConfig config;
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40
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41 protected HotSpotMethodDataAccessor(HotSpotVMConfig config, int tag, int staticSize) {
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42 this.config = config;
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43 this.tag = tag;
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44 this.staticSize = staticSize;
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45 }
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46
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47 /**
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48 * Returns the tag stored in the LayoutData header.
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49 *
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50 * @return tag stored in the LayoutData header
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51 */
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52 int getTag() {
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53 return tag;
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54 }
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55
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56 static int readTag(HotSpotVMConfig config, HotSpotMethodData data, int position) {
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57 final int tag = data.readUnsignedByte(position, config.dataLayoutTagOffset);
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58 assert tag >= config.dataLayoutNoTag && tag <= config.dataLayoutSpeculativeTrapDataTag : "profile data tag out of bounds: " + tag;
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59 return tag;
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60 }
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61
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62 /**
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63 * Returns the BCI stored in the LayoutData header.
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64 *
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65 * @return an integer between 0 and {@link Short#MAX_VALUE} inclusive, or -1 if not supported
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66 */
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67 int getBCI(HotSpotMethodData data, int position) {
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68 return data.readUnsignedShort(position, config.dataLayoutBCIOffset);
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69 }
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70
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71 /**
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72 * Computes the size for the specific data at the given position.
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73 *
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74 * @return a value greater than 0
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75 */
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76 final int getSize(HotSpotMethodData data, int position) {
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77 int size = staticSize + getDynamicSize(data, position);
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78 // Sanity check against VM
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79 int vmSize = HotSpotJVMCIRuntime.runtime().compilerToVm.methodDataProfileDataSize(data.metaspaceMethodData, position);
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80 assert size == vmSize : size + " != " + vmSize;
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81 return size;
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82 }
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83
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84 TriState getExceptionSeen(HotSpotMethodData data, int position) {
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85 final int exceptionsMask = 1 << config.bitDataExceptionSeenFlag;
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86 return TriState.get((getFlags(data, position) & exceptionsMask) != 0);
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87 }
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88
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89 /**
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90 * @param data
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91 * @param position
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92 */
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93 JavaTypeProfile getTypeProfile(HotSpotMethodData data, int position) {
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94 return null;
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95 }
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96
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97 /**
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98 * @param data
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99 * @param position
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100 */
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101 JavaMethodProfile getMethodProfile(HotSpotMethodData data, int position) {
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102 return null;
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103 }
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104
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105 /**
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106 * @param data
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107 * @param position
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108 */
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109 double getBranchTakenProbability(HotSpotMethodData data, int position) {
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110 return -1;
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111 }
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112
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113 /**
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114 * @param data
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115 * @param position
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116 */
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117 double[] getSwitchProbabilities(HotSpotMethodData data, int position) {
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118 return null;
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119 }
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120
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121 /**
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122 * @param data
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123 * @param position
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124 */
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125 int getExecutionCount(HotSpotMethodData data, int position) {
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126 return -1;
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127 }
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128
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129 /**
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130 * @param data
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131 * @param position
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132 */
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133 TriState getNullSeen(HotSpotMethodData data, int position) {
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134 return TriState.UNKNOWN;
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135 }
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136
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137 protected int getFlags(HotSpotMethodData data, int position) {
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138 return data.readUnsignedByte(position, config.dataLayoutFlagsOffset);
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139 }
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140
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141 /**
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142 * @param data
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143 * @param position
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144 */
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145 protected int getDynamicSize(HotSpotMethodData data, int position) {
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146 return 0;
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147 }
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148
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149 abstract StringBuilder appendTo(StringBuilder sb, HotSpotMethodData data, int pos);
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150
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151 }