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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/profiles/ValueProfile.java @ 22501:a63bda98cfdb

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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
author Christian Humer <christian.humer@oracle.com>
date Wed, 16 Dec 2015 16:38:13 +0100
parents truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ValueProfile.java@71c7a1ae8829
children
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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 import com.oracle.truffle.api.Truffle;
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32
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33 /**
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34 * <p>
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35 * Specialized value profile to capture certain properties of <code>Object</code> runtime values.
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36 * Value profiles require a runtime check in their initialized state to verify their profiled
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37 * assumption. Value profiles are limited to capture monomorphic profiles only. This means that if
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38 * two or more identities or classes are profiles within a single profile then the profile has no
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39 * effect and no overhead after compilation. There are specialized versions of this profile with
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40 * less interpreter footprint for {@link ConditionProfile boolean}, {@link ByteValueProfile byte},
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41 * {@link IntValueProfile int}, {@link LongValueProfile long}, {@link FloatValueProfile float} and
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42 * {@link DoubleValueProfile double} values.
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43 * </p>
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44 *
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45 * <p>
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46 * <b> Usage example: </b>
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47 *
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48 * <pre>
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49 * class SampleNode extends Node {
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50 *
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51 * final ValueProfile profile = ValueProfile.create{Identity,Class}Profile();
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52 *
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53 * Object execute(Object input) {
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54 * Object profiledValue = profile.profile(input);
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55 * // compiler may know now more about profiledValue
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56 * return profieldValue;
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57 * }
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58 * }
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59 * </pre>
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60 * <p>
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61 *
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62 *
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63 * {@inheritDoc}
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64 *
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65 * @see #createIdentityProfile()
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66 * @see #createClassProfile()
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67 */
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68 public abstract class ValueProfile extends Profile {
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69
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70 ValueProfile() {
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71 }
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73 public abstract <T> T profile(T value);
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75 /**
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76 * <p>
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77 * Returns a value profile that profiles the exact class of a value. It will check the class of
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78 * the profiled value and provide additional information to the compiler if only non-null values
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79 * of exactly one concrete Java class are passed as a parameter to the
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80 * {@link ValueProfile#profile} method. This can be beneficial if subsequent code can take
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81 * advantage of knowing the concrete class of the value. The profile will degrade to the generic
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82 * case if a null value or if at least two instances of two different Java classes are
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83 * registered.
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84 * </p>
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85 *
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86 * <p>
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87 * <b>Compilation notes:</b> Value profiles require a runtime check in their initialized state
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88 * to verify their profiled class. If two classes have been seen on a single profile instance
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89 * then this profile will transition to a generic state with no overhead.
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90 * </P>
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91 *
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92 * @see ValueProfile usage example
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93 */
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94 public static ValueProfile createClassProfile() {
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95 if (Truffle.getRuntime().isProfilingEnabled()) {
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96 return ExactClass.create();
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97 } else {
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98 return Disabled.INSTANCE;
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99 }
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100 }
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101
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102 /**
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103 * <p>
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104 * Returns a value profile that profiles the object identity of a value. A single instance can
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105 * only profile one particular instance.
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106 * </p>
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107 *
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108 * <p>
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109 * <b>Compilation notes:</b> Identity profiles require a runtime check to verify their profiled
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110 * object identity. If two identities have been seen on a single profile instance then this
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111 * profile will transition to a generic state with no overhead.
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112 * </p>
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113 */
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114 public static ValueProfile createIdentityProfile() {
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115 if (Truffle.getRuntime().isProfilingEnabled()) {
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116 return Identity.create();
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117 } else {
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118 return Disabled.INSTANCE;
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119 }
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120 }
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121
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122 /**
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123 * <p>
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124 * Returns a value profile that profiles the object equality of a value. A single instance can
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125 * only profile one set of equal values.
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126 * </p>
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127 *
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128 * <p>
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129 * <b>Compilation notes:</b> Equality profiles inline the body of the equal method of the first
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130 * profiled value in order to verify its assumption. Please take care that you do this only for
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131 * equals implementations that your guest language actually has control over otherwise your
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132 * compiled code might contain recursions or too much code. If two non equal objects have been
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133 * seen on a single profile instance then this profile will transition to a generic state with
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134 * no overhead.
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135 * </p>
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136 */
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137 public static ValueProfile createEqualityProfile() {
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138 if (Truffle.getRuntime().isProfilingEnabled()) {
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139 return Equality.create();
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140 } else {
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141 return Disabled.INSTANCE;
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142 }
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143 }
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144
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145 static final class Disabled extends ValueProfile {
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146
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147 static final ValueProfile INSTANCE = new Disabled();
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148
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149 @Override
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150 protected Object clone() {
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151 return INSTANCE;
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152 }
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153
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154 @Override
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155 public <T> T profile(T value) {
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156 return value;
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157 }
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158
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159 @Override
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160 public String toString() {
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161 return toStringDisabled(ValueProfile.class);
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162 }
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163
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164 }
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165
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166 static final class Equality extends ValueProfile {
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167
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168 private static final Object GENERIC = new Object();
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169
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170 @CompilationFinal protected Object cachedValue = null;
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171
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172 Equality() {
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173 }
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174
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175 @Override
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176 @SuppressWarnings("unchecked")
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177 public <T> T profile(T newValue) {
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178 // Field needs to be cached in local variable for thread safety and startup speed.
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179 Object cached = this.cachedValue;
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180 if (cached != GENERIC) {
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181 if (cached != null && cached.equals(newValue)) {
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182 return (T) cached;
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183 } else {
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184 CompilerDirectives.transferToInterpreterAndInvalidate();
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185 if (cached == null && newValue != null) {
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186 cachedValue = newValue;
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187 } else {
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188 cachedValue = GENERIC;
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189 }
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190 }
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191 }
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192 return newValue;
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193 }
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194
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195 public boolean isGeneric() {
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196 return getCachedValue() == GENERIC;
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197 }
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198
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199 public boolean isUninitialized() {
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200 return getCachedValue() == null;
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201 }
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202
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203 public Object getCachedValue() {
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204 return cachedValue;
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205 }
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206
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207 @Override
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208 public String toString() {
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209 return toString(ValueProfile.class, isUninitialized(), isGeneric(), //
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210 String.format("value == %s@%x", cachedValue != null ? cachedValue.getClass().getSimpleName() : "null", Objects.hash(cachedValue)));
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211 }
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212
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213 /* Needed for lazy class loading. */
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214 static ValueProfile create() {
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215 return new Equality();
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216 }
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217
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218 }
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219
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220 static final class Identity extends ValueProfile {
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221
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222 private static final Object UNINITIALIZED = new Object();
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223 private static final Object GENERIC = new Object();
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224
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225 @CompilationFinal protected Object cachedValue = UNINITIALIZED;
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226
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227 Identity() {
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228 }
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229
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230 @Override
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231 @SuppressWarnings("unchecked")
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232 public <T> T profile(T newValue) {
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233 // Field needs to be cached in local variable for thread safety and startup speed.
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234 Object cached = this.cachedValue;
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235 if (cached != GENERIC) {
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236 if (cached == newValue) {
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237 return (T) cached;
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238 } else {
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239 CompilerDirectives.transferToInterpreterAndInvalidate();
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240 if (cachedValue == UNINITIALIZED) {
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241 cachedValue = newValue;
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242 } else {
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243 cachedValue = GENERIC;
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244 }
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245 }
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246 }
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247 return newValue;
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248 }
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249
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250 public boolean isGeneric() {
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251 return getCachedValue() == GENERIC;
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252 }
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253
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254 public boolean isUninitialized() {
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255 return getCachedValue() == UNINITIALIZED;
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256 }
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257
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258 public Object getCachedValue() {
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259 return cachedValue;
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260 }
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261
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262 @Override
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263 public String toString() {
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264 return toString(ValueProfile.class, isUninitialized(), isGeneric(), //
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265 String.format("value == %s@%x", cachedValue != null ? cachedValue.getClass().getSimpleName() : "null", Objects.hash(cachedValue)));
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266 }
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267
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268 /* Needed for lazy class loading. */
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269 static ValueProfile create() {
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270 return new Identity();
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271 }
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272
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273 }
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274
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275 static final class ExactClass extends ValueProfile {
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276
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277 @CompilationFinal protected Class<?> cachedClass;
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278
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279 ExactClass() {
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280 }
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281
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282 public static ValueProfile create() {
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283 return new ExactClass();
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284 }
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285
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286 @SuppressWarnings("unchecked")
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287 @Override
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288 public <T> T profile(T value) {
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289 // Field needs to be cached in local variable for thread safety and startup speed.
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290 Class<?> clazz = cachedClass;
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291 if (clazz != Object.class) {
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292 if (clazz != null && value != null && clazz == value.getClass()) {
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293 /*
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294 * The cast is really only for the compiler relevant. It does not perform any
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295 * useful action in the interpreter and only takes time.
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296 */
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297 if (CompilerDirectives.inInterpreter()) {
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298 return value;
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299 } else {
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300 return (T) clazz.cast(value);
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301 }
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302 } else {
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303 CompilerDirectives.transferToInterpreterAndInvalidate();
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304 if (clazz == null && value != null) {
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305 cachedClass = value.getClass();
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306 } else {
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307 cachedClass = Object.class;
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308 }
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309 }
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310 }
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311 return value;
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312 }
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313
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314 boolean isGeneric() {
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315 return cachedClass == Object.class;
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316 }
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317
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318 boolean isUninitialized() {
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319 return cachedClass == null;
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320 }
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321
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322 Class<?> getCachedClass() {
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323 return cachedClass;
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324 }
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325
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326 @Override
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327 public String toString() {
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328 return toString(ValueProfile.class, cachedClass == null, cachedClass == Object.class, //
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329 String.format("value.getClass() == %s.class", cachedClass != null ? cachedClass.getSimpleName() : "null"));
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330 }
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331
17039
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332 }
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333
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334 }