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annotate truffle/com.oracle.truffle.api.profiles/src/com/oracle/truffle/api/profiles/BranchProfile.java @ 22526:a5e58793bbca

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BranchProfile Javadoc sample was uncompilable. Fixed with the help of codesnippet tag.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 30 Dec 2015 11:06:33 +0100
parents d80a5ff56f51
children
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> {@codesnippet BranchProfileSample}
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40 *
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41 * {@inheritDoc}
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42 *
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43 * @see BranchProfile#enter()
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44 */
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45 public abstract class BranchProfile extends Profile {
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46
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47 BranchProfile() {
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48 }
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49
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50 /**
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51 * Call when an unlikely branch is entered.
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52 */
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53 public abstract void enter();
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54
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55 /**
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56 * @deprecated it is not reliable when profiling is turned off.
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57 */
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58 @Deprecated
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59 public abstract boolean isVisited();
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60
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61 /**
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62 * Call to create a new instance of a branch profile.
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63 */
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64 public static BranchProfile create() {
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65 if (Profile.isProfilingEnabled()) {
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66 return Enabled.create0();
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67 } else {
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68 return Disabled.INSTANCE;
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69 }
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70 }
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71
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72 static final class Enabled extends BranchProfile {
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74 @CompilationFinal private boolean visited;
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75
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76 @Override
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77 public void enter() {
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78 if (!visited) {
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79 CompilerDirectives.transferToInterpreterAndInvalidate();
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80 visited = true;
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81 }
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82 }
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83
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84 @SuppressWarnings("deprecation")
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85 @Override
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86 public boolean isVisited() {
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87 return visited;
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88 }
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89
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90 @Override
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91 public String toString() {
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92 return toString(BranchProfile.class, !visited, false, "VISITED");
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93 }
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94
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95 /* Needed for lazy class loading. */
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96 static BranchProfile create0() {
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97 return new Enabled();
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98 }
16747
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99 }
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100
22501
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101 static final class Disabled extends BranchProfile {
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102
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103 static final BranchProfile INSTANCE = new Disabled();
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104
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105 @Override
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106 protected Object clone() {
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107 return INSTANCE;
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108 }
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109
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110 @Override
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111 public void enter() {
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112 }
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113
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114 @SuppressWarnings("deprecation")
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115 @Override
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116 public boolean isVisited() {
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117 return true;
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118 }
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119
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120 @Override
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121 public String toString() {
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122 return toStringDisabled(BranchProfile.class);
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123 }
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124
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125 }
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126
13335
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127 }