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annotate truffle/com.oracle.truffle.api.profiles/src/com/oracle/truffle/api/profiles/BranchProfile.java @ 22504:d80a5ff56f51

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Storing the profiling enabled information in a static field; checking it only once; shielding against missing method in the TruffleRuntime interface
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 17 Dec 2015 13:45:37 +0100
parents 828c67903db2
children a5e58793bbca
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2013, 2015, 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.profiles;
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26
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27 import com.oracle.truffle.api.CompilerDirectives;
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28 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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29
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30 /**
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31 * <p>
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32 * BranchProfiles are profiles to speculate on branches that are unlikely to be visited. If the
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33 * {@link #enter()} method is invoked first the optimized code is invalidated and the branch where
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34 * {@link #enter()} is invoked is enabled for compilation. Otherwise if the {@link #enter()} method
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35 * was never invoked the branch will not get compiled.
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36 * </p>
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37 *
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38 * <p>
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39 * <b> Usage example: </b>
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40 *
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41 * <pre>
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42 * class SampleNode extends Node {
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43 *
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44 * final BranchProfile errorProfile = BranchProfile.create();
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45 *
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46 * void execute(int value) {
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47 * if (value == Integer.MAX_VALUE) {
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48 * errorProfile.enter();
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49 * throw new Error(&quot;Invalid input value&quot;)
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50 * }
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51 * return value;
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52 * }
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53 * }
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54 * </pre>
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55 *
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56 * {@inheritDoc}
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57 *
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58 * @see BranchProfile#enter()
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59 */
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60 public abstract class BranchProfile extends Profile {
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61
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62 BranchProfile() {
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63 }
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64
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65 /**
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66 * Call when an unlikely branch is entered.
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67 */
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68 public abstract void enter();
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69
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70 /**
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71 * @deprecated it is not reliable when profiling is turned off.
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72 */
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73 @Deprecated
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74 public abstract boolean isVisited();
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75
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76 /**
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77 * Call to create a new instance of a branch profile.
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78 */
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79 public static BranchProfile create() {
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80 if (Profile.isProfilingEnabled()) {
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81 return Enabled.create0();
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82 } else {
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83 return Disabled.INSTANCE;
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84 }
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85 }
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86
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87 static final class Enabled extends BranchProfile {
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88
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89 @CompilationFinal private boolean visited;
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90
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91 @Override
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92 public void enter() {
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93 if (!visited) {
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94 CompilerDirectives.transferToInterpreterAndInvalidate();
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95 visited = true;
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96 }
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97 }
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98
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99 @SuppressWarnings("deprecation")
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100 @Override
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101 public boolean isVisited() {
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102 return visited;
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103 }
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104
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105 @Override
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106 public String toString() {
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107 return toString(BranchProfile.class, !visited, false, "VISITED");
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108 }
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109
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110 /* Needed for lazy class loading. */
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111 static BranchProfile create0() {
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112 return new Enabled();
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113 }
16747
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114 }
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115
22501
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116 static final class Disabled extends BranchProfile {
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117
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118 static final BranchProfile INSTANCE = new Disabled();
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119
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120 @Override
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121 protected Object clone() {
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122 return INSTANCE;
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123 }
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124
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125 @Override
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126 public void enter() {
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127 }
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128
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129 @SuppressWarnings("deprecation")
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130 @Override
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131 public boolean isVisited() {
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132 return true;
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133 }
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134
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135 @Override
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136 public String toString() {
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137 return toStringDisabled(BranchProfile.class);
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138 }
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139
17421
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140 }
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141
13335
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parents:
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142 }