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annotate truffle/com.oracle.truffle.api.profiles/src/com/oracle/truffle/api/profiles/ValueProfile.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2014, 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 java.util.Objects;
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28
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29 import com.oracle.truffle.api.CompilerDirectives;
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30 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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31
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32 /**
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33 * <p>
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34 * Specialized value profile to capture certain properties of <code>Object</code> runtime values.
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35 * Value profiles require a runtime check in their initialized state to verify their profiled
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36 * assumption. Value profiles are limited to capture monomorphic profiles only. This means that if
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37 * two or more identities or classes are profiles within a single profile then the profile has no
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38 * effect and no overhead after compilation. There are specialized versions of this profile with
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39 * less interpreter footprint for {@link ConditionProfile boolean}, {@link ByteValueProfile byte},
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40 * {@link IntValueProfile int}, {@link LongValueProfile long}, {@link FloatValueProfile float} and
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41 * {@link DoubleValueProfile double} values.
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42 * </p>
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43 *
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44 * <p>
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45 * <b> Usage example: </b>
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46 *
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47 * <pre>
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48 * class SampleNode extends Node {
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49 *
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50 * final ValueProfile profile = ValueProfile.create{Identity,Class}Profile();
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51 *
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52 * Object execute(Object input) {
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53 * Object profiledValue = profile.profile(input);
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54 * // compiler may know now more about profiledValue
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55 * return profieldValue;
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56 * }
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57 * }
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58 * </pre>
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59 * <p>
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60 *
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61 *
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62 * {@inheritDoc}
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63 *
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64 * @see #createIdentityProfile()
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65 * @see #createClassProfile()
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66 */
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67 public abstract class ValueProfile extends Profile {
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68
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69 ValueProfile() {
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70 }
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72 public abstract <T> T profile(T value);
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74 /**
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75 * <p>
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76 * Returns a value profile that profiles the exact class of a value. It will check the class of
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77 * the profiled value and provide additional information to the compiler if only non-null values
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78 * of exactly one concrete Java class are passed as a parameter to the
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79 * {@link ValueProfile#profile} method. This can be beneficial if subsequent code can take
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80 * advantage of knowing the concrete class of the value. The profile will degrade to the generic
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81 * case if a null value or if at least two instances of two different Java classes are
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82 * registered.
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83 * </p>
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84 *
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85 * <p>
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86 * <b>Compilation notes:</b> Value profiles require a runtime check in their initialized state
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87 * to verify their profiled class. If two classes have been seen on a single profile instance
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88 * then this profile will transition to a generic state with no overhead.
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89 * </P>
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90 *
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91 * @see ValueProfile usage example
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92 */
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93 public static ValueProfile createClassProfile() {
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94 if (Profile.isProfilingEnabled()) {
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95 return ExactClass.create();
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96 } else {
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97 return Disabled.INSTANCE;
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98 }
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99 }
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100
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101 /**
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102 * <p>
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103 * Returns a value profile that profiles the object identity of a value. A single instance can
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104 * only profile one particular instance.
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105 * </p>
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106 *
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107 * <p>
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108 * <b>Compilation notes:</b> Identity profiles require a runtime check to verify their profiled
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109 * object identity. If two identities have been seen on a single profile instance then this
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110 * profile will transition to a generic state with no overhead.
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111 * </p>
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112 */
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113 public static ValueProfile createIdentityProfile() {
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114 if (Profile.isProfilingEnabled()) {
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115 return Identity.create();
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116 } else {
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117 return Disabled.INSTANCE;
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118 }
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119 }
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120
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121 /**
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122 * <p>
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123 * Returns a value profile that profiles the object equality of a value. A single instance can
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124 * only profile one set of equal values.
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125 * </p>
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126 *
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127 * <p>
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128 * <b>Compilation notes:</b> Equality profiles inline the body of the equal method of the first
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129 * profiled value in order to verify its assumption. Please take care that you do this only for
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130 * equals implementations that your guest language actually has control over otherwise your
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131 * compiled code might contain recursions or too much code. If two non equal objects have been
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132 * seen on a single profile instance then this profile will transition to a generic state with
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133 * no overhead.
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134 * </p>
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135 */
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136 public static ValueProfile createEqualityProfile() {
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137 if (Profile.isProfilingEnabled()) {
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138 return Equality.create();
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139 } else {
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140 return Disabled.INSTANCE;
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141 }
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142 }
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143
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144 static final class Disabled extends ValueProfile {
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145
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146 static final ValueProfile INSTANCE = new Disabled();
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147
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148 @Override
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149 protected Object clone() {
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150 return INSTANCE;
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151 }
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152
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153 @Override
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154 public <T> T profile(T value) {
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155 return value;
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156 }
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157
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158 @Override
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159 public String toString() {
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160 return toStringDisabled(ValueProfile.class);
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161 }
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162
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163 }
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164
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165 static final class Equality extends ValueProfile {
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166
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167 private static final Object GENERIC = new Object();
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168
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169 @CompilationFinal protected Object cachedValue = null;
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170
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171 Equality() {
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172 }
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173
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174 @Override
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175 @SuppressWarnings("unchecked")
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176 public <T> T profile(T newValue) {
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177 // Field needs to be cached in local variable for thread safety and startup speed.
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178 Object cached = this.cachedValue;
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179 if (cached != GENERIC) {
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180 if (cached != null && cached.equals(newValue)) {
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181 return (T) cached;
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182 } else {
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183 CompilerDirectives.transferToInterpreterAndInvalidate();
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184 if (cached == null && newValue != null) {
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185 cachedValue = newValue;
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186 } else {
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187 cachedValue = GENERIC;
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188 }
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189 }
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190 }
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191 return newValue;
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192 }
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193
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194 public boolean isGeneric() {
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195 return getCachedValue() == GENERIC;
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196 }
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197
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198 public boolean isUninitialized() {
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199 return getCachedValue() == null;
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200 }
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201
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202 public Object getCachedValue() {
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203 return cachedValue;
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204 }
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205
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206 @Override
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207 public String toString() {
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208 return toString(ValueProfile.class, isUninitialized(), isGeneric(), //
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209 String.format("value == %s@%x", cachedValue != null ? cachedValue.getClass().getSimpleName() : "null", Objects.hash(cachedValue)));
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210 }
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211
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212 /* Needed for lazy class loading. */
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213 static ValueProfile create() {
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214 return new Equality();
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215 }
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216
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217 }
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218
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219 static final class Identity extends ValueProfile {
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220
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221 private static final Object UNINITIALIZED = new Object();
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222 private static final Object GENERIC = new Object();
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223
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224 @CompilationFinal protected Object cachedValue = UNINITIALIZED;
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225
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226 Identity() {
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227 }
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228
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229 @Override
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230 @SuppressWarnings("unchecked")
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231 public <T> T profile(T newValue) {
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232 // Field needs to be cached in local variable for thread safety and startup speed.
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233 Object cached = this.cachedValue;
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234 if (cached != GENERIC) {
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235 if (cached == newValue) {
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236 return (T) cached;
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237 } else {
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238 CompilerDirectives.transferToInterpreterAndInvalidate();
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239 if (cachedValue == UNINITIALIZED) {
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240 cachedValue = newValue;
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241 } else {
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242 cachedValue = GENERIC;
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243 }
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244 }
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245 }
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246 return newValue;
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247 }
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248
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249 public boolean isGeneric() {
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250 return getCachedValue() == GENERIC;
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251 }
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252
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253 public boolean isUninitialized() {
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254 return getCachedValue() == UNINITIALIZED;
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255 }
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256
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257 public Object getCachedValue() {
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258 return cachedValue;
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259 }
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260
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261 @Override
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262 public String toString() {
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263 return toString(ValueProfile.class, isUninitialized(), isGeneric(), //
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264 String.format("value == %s@%x", cachedValue != null ? cachedValue.getClass().getSimpleName() : "null", Objects.hash(cachedValue)));
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265 }
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266
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267 /* Needed for lazy class loading. */
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268 static ValueProfile create() {
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269 return new Identity();
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270 }
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271
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272 }
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273
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274 static final class ExactClass extends ValueProfile {
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275
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276 @CompilationFinal protected Class<?> cachedClass;
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277
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278 ExactClass() {
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279 }
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280
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281 public static ValueProfile create() {
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282 return new ExactClass();
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283 }
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284
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285 @SuppressWarnings("unchecked")
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286 @Override
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287 public <T> T profile(T value) {
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288 // Field needs to be cached in local variable for thread safety and startup speed.
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289 Class<?> clazz = cachedClass;
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290 if (clazz != Object.class) {
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291 if (clazz != null && value != null && clazz == value.getClass()) {
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292 /*
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293 * The cast is really only for the compiler relevant. It does not perform any
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294 * useful action in the interpreter and only takes time.
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295 */
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296 if (CompilerDirectives.inInterpreter()) {
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297 return value;
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298 } else {
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299 return (T) clazz.cast(value);
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300 }
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301 } else {
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302 CompilerDirectives.transferToInterpreterAndInvalidate();
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303 if (clazz == null && value != null) {
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304 cachedClass = value.getClass();
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305 } else {
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306 cachedClass = Object.class;
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307 }
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308 }
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309 }
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310 return value;
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311 }
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312
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313 boolean isGeneric() {
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314 return cachedClass == Object.class;
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315 }
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316
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317 boolean isUninitialized() {
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318 return cachedClass == null;
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319 }
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320
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321 Class<?> getCachedClass() {
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322 return cachedClass;
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323 }
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324
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325 @Override
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326 public String toString() {
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327 return toString(ValueProfile.class, cachedClass == null, cachedClass == Object.class, //
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328 String.format("value.getClass() == %s.class", cachedClass != null ? cachedClass.getSimpleName() : "null"));
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329 }
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330
17039
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331 }
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332
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333 }