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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 // This code was auto-generated, is not intended to be edited, and is subject to | |
| 6 // significant change. Please see the README file for more information. | |
| 7 | |
| 8 library engine.utilities.general; | |
| 9 | |
| 10 import 'dart:profiler'; | |
| 11 | |
| 12 /** | |
| 13 * Jenkins hash function, optimized for small integers. | |
| 14 * Borrowed from sdk/lib/math/jenkins_smi_hash.dart. | |
| 15 */ | |
| 16 class JenkinsSmiHash { | |
| 17 static int combine(int hash, int value) { | |
| 18 hash = 0x1fffffff & (hash + value); | |
| 19 hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10)); | |
| 20 return hash ^ (hash >> 6); | |
| 21 } | |
| 22 | |
| 23 static int finish(int hash) { | |
| 24 hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3)); | |
| 25 hash = hash ^ (hash >> 11); | |
| 26 return 0x1fffffff & (hash + ((0x00003fff & hash) << 15)); | |
| 27 } | |
| 28 | |
| 29 static int hash2(a, b) => finish(combine(combine(0, a), b)); | |
| 30 | |
| 31 static int hash3(a, b, c) => finish(combine(combine(combine(0, a), b), c)); | |
| 32 | |
| 33 static int hash4(a, b, c, d) => | |
| 34 finish(combine(combine(combine(combine(0, a), b), c), d)); | |
| 35 } | |
| 36 | |
| 37 /** | |
| 38 * Helper class for gathering performance statistics. This class is modeled on | |
| 39 * the UserTag class in dart:profiler so that it can interoperate easily with | |
| 40 * it. | |
| 41 */ | |
| 42 abstract class PerformanceTag { | |
| 43 /** | |
| 44 * Return a list of all [PerformanceTag]s which have been created. | |
| 45 */ | |
| 46 static List<PerformanceTag> get all => _PerformanceTagImpl.all.toList(); | |
| 47 | |
| 48 /** | |
| 49 * Return the current [PerformanceTag] for the isolate. | |
| 50 */ | |
| 51 static PerformanceTag get current => _PerformanceTagImpl.current; | |
| 52 | |
| 53 /** | |
| 54 * Return the [PerformanceTag] that is initially current. This is intended | |
| 55 * to track time when the system is performing unknown operations. | |
| 56 */ | |
| 57 static PerformanceTag get UNKNOWN => _PerformanceTagImpl.UNKNOWN; | |
| 58 | |
| 59 /** | |
| 60 * Create a [PerformanceTag] having the given [label]. A [UserTag] will also | |
| 61 * be created, having the same [label], so that performance information can | |
| 62 * be queried using the observatory. | |
| 63 */ | |
| 64 factory PerformanceTag(String label) = _PerformanceTagImpl; | |
| 65 | |
| 66 /** | |
| 67 * Return the total number of milliseconds that this [PerformanceTag] has | |
| 68 * been the current [PerformanceTag] for the isolate. | |
| 69 * | |
| 70 * This call is safe even if this [PerformanceTag] is current. | |
| 71 */ | |
| 72 int get elapsedMs; | |
| 73 | |
| 74 /** | |
| 75 * Return the label for this [PerformanceTag]. | |
| 76 */ | |
| 77 String get label; | |
| 78 | |
| 79 /** | |
| 80 * Make this the current tag for the isolate, and return the previous tag. | |
| 81 */ | |
| 82 PerformanceTag makeCurrent(); | |
| 83 | |
| 84 /** | |
| 85 * Make this the current tag for the isolate, run [f], and restore the | |
| 86 * previous tag. Returns the result of invoking [f]. | |
| 87 */ | |
| 88 makeCurrentWhile(f()); | |
| 89 | |
| 90 /** | |
| 91 * Reset the total time tracked by all [PerformanceTag]s to zero. | |
| 92 */ | |
| 93 static void reset() { | |
| 94 for (_PerformanceTagImpl tag in _PerformanceTagImpl.all) { | |
| 95 tag.stopwatch.reset(); | |
| 96 } | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 class _PerformanceTagImpl implements PerformanceTag { | |
| 101 /** | |
| 102 * The current performance tag for the isolate. | |
| 103 */ | |
| 104 static _PerformanceTagImpl current = UNKNOWN; | |
| 105 | |
| 106 static final _PerformanceTagImpl UNKNOWN = new _PerformanceTagImpl('unknown'); | |
| 107 | |
| 108 /** | |
| 109 * A list of all performance tags that have been created so far. | |
| 110 */ | |
| 111 static List<_PerformanceTagImpl> all = <_PerformanceTagImpl>[]; | |
| 112 | |
| 113 /** | |
| 114 * The [UserTag] associated with this [PerformanceTag]. | |
| 115 */ | |
| 116 final UserTag userTag; | |
| 117 | |
| 118 /** | |
| 119 * Stopwatch tracking the amount of time this [PerformanceTag] has been the | |
| 120 * current tag for the isolate. | |
| 121 */ | |
| 122 final Stopwatch stopwatch; | |
| 123 | |
| 124 _PerformanceTagImpl(String label) | |
| 125 : userTag = new UserTag(label), | |
| 126 stopwatch = new Stopwatch() { | |
| 127 all.add(this); | |
| 128 } | |
| 129 | |
| 130 @override | |
| 131 int get elapsedMs => stopwatch.elapsedMilliseconds; | |
| 132 | |
| 133 @override | |
| 134 String get label => userTag.label; | |
| 135 | |
| 136 @override | |
| 137 PerformanceTag makeCurrent() { | |
| 138 if (identical(this, current)) { | |
| 139 return current; | |
| 140 } | |
| 141 _PerformanceTagImpl previous = current; | |
| 142 previous.stopwatch.stop(); | |
| 143 stopwatch.start(); | |
| 144 current = this; | |
| 145 userTag.makeCurrent(); | |
| 146 return previous; | |
| 147 } | |
| 148 | |
| 149 makeCurrentWhile(f()) { | |
| 150 PerformanceTag prevTag = makeCurrent(); | |
| 151 try { | |
| 152 return f(); | |
| 153 } finally { | |
| 154 prevTag.makeCurrent(); | |
| 155 } | |
| 156 } | |
| 157 } | |
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Chromium Code Reviews
Issue 1400473008:
Roll Observatory packages and add a roll script (Closed)
Base URL: git@github.com:dart-lang/observatory_pub_packages.git@master