| <!DOCTYPE html> |
| <!-- |
| Copyright 2016 The Chromium Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style license that can be |
| found in the LICENSE file. |
| --> |
| |
| <link rel="import" href="/tracing/model/object_instance.html"> |
| |
| <script> |
| 'use strict'; |
| |
| /** |
| * @fileoverview BlameContext is the Trace Viewer side correspondence of |
| * Chrome's class base::trace_event::BlameContext. More specifically, |
| * |
| * BlameContextSnapshot, which inherits from ObjectSnapshot, is the base class |
| * of all snapshots of blame contexts traced in Chrome. |
| * |
| * BlameContextInstance, which inherits from ObjectInstance, gathers snapshots |
| * of the same blame context traced in Chrome. |
| * |
| * BlameContextSnapshot and BlameContextInstance should never be instantiated |
| * directly. Subclasses corresponding to different BlameContexts in Chrome |
| * should define their own BlameContextSnapshot and BlameContextInstance |
| * specializations for instantiation. |
| * |
| */ |
| tr.exportTo('tr.e.chrome', function() { |
| const ObjectSnapshot = tr.model.ObjectSnapshot; |
| const ObjectInstance = tr.model.ObjectInstance; |
| |
| function BlameContextSnapshot() { |
| ObjectSnapshot.apply(this, arguments); |
| } |
| |
| BlameContextSnapshot.prototype = { |
| __proto__: ObjectSnapshot.prototype, |
| |
| /** |
| * Returns the parent in the context tree. |
| */ |
| get parentContext() { |
| if (this.args.parent instanceof BlameContextSnapshot) { |
| return this.args.parent; |
| } |
| return undefined; |
| }, |
| |
| get userFriendlyName() { |
| return 'BlameContext'; |
| } |
| }; |
| |
| function BlameContextInstance() { |
| ObjectInstance.apply(this, arguments); |
| } |
| |
| BlameContextInstance.prototype = { |
| __proto__: ObjectInstance.prototype, |
| |
| /** |
| * Returns the type of the blame context, to be overriden by subclasses. |
| */ |
| get blameContextType() { |
| throw new Error('Not implemented'); |
| } |
| }; |
| |
| return { |
| BlameContextSnapshot, |
| BlameContextInstance, |
| }; |
| }); |
| </script> |
