зеркало из https://github.com/mozilla/gecko-dev.git
73 строки
2.6 KiB
C++
73 строки
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DDLifetime_h_
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#define DDLifetime_h_
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#include "DDLogObject.h"
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#include "DDMessageIndex.h"
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#include "DDTimeStamp.h"
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namespace mozilla {
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namespace dom {
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class HTMLMediaElement;
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} // namespace dom
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// This struct records the lifetime of one C++ object.
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// Note that multiple objects may have the same address and type (at different
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// times), so the recorded construction/destruction times should be used to
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// distinguish them.
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struct DDLifetime {
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const DDLogObject mObject;
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const DDMessageIndex mConstructionIndex;
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const DDTimeStamp mConstructionTimeStamp;
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// Only valid when mDestructionTimeStamp is not null.
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DDMessageIndex mDestructionIndex;
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DDTimeStamp mDestructionTimeStamp;
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// Associated HTMLMediaElement, initially nullptr until this object can be
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// linked to its HTMLMediaElement.
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const dom::HTMLMediaElement* mMediaElement;
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// If not null, derived object for which this DDLifetime is a base class.
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// This is used to link messages from the same object, even when they
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// originate from a method on a base class.
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// Note: We assume a single-inheritance hierarchy.
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DDLogObject mDerivedObject;
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DDMessageIndex mDerivedObjectLinkingIndex;
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// Unique tag used to identify objects in a log, easier to read than object
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// pointers.
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// Negative and unique for unassociated objects.
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// Positive for associated objects, and unique for that HTMLMediaElement
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// group.
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int32_t mTag;
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DDLifetime(DDLogObject aObject, DDMessageIndex aConstructionIndex,
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DDTimeStamp aConstructionTimeStamp, int32_t aTag)
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: mObject(aObject),
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mConstructionIndex(aConstructionIndex),
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mConstructionTimeStamp(aConstructionTimeStamp),
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mDestructionIndex(0),
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mMediaElement(nullptr),
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mDerivedObjectLinkingIndex(0),
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mTag(aTag) {}
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// Is this lifetime alive at the given index?
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// I.e.: Constructed before, and destroyed later or not yet.
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bool IsAliveAt(DDMessageIndex aIndex) const {
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return aIndex >= mConstructionIndex &&
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(!mDestructionTimeStamp || aIndex <= mDestructionIndex);
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}
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// Print the object's pointer, tag and class name (and derived class). E.g.:
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// "dom::HTMLVideoElement[134073800]#1 (as dom::HTMLMediaElement)"
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void AppendPrintf(nsCString& aString) const;
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nsCString Printf() const;
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};
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} // namespace mozilla
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#endif // DDLifetime_h_
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