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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_BASE_GLOBALTEARDOWNOBSERVER_H_
#define DOM_BASE_GLOBALTEARDOWNOBSERVER_H_
#include "mozilla/Attributes.h"
#include "nsIGlobalObject.h"
#include "nsIScriptGlobalObject.h"
namespace mozilla {
class GlobalTeardownObserver
: public nsISupports,
public LinkedListElement<GlobalTeardownObserver> {
public:
GlobalTeardownObserver();
explicit GlobalTeardownObserver(nsIGlobalObject* aGlobalObject,
bool aHasOrHasHadOwnerWindow = false);
nsGlobalWindowInner* GetOwnerWindow() const;
nsIGlobalObject* GetOwnerGlobal() const { return mParentObject; }
bool HasOrHasHadOwnerWindow() const { return mHasOrHasHadOwnerWindow; }
void GetParentObject(nsIScriptGlobalObject** aParentObject) {
if (mParentObject) {
CallQueryInterface(mParentObject, aParentObject);
} else {
*aParentObject = nullptr;
}
}
virtual void DisconnectFromOwner();
// A global permanently becomes invalid when DisconnectEventTargetObjects() is
// called. Normally this means:
// - For the main thread, when nsGlobalWindowInner::FreeInnerObjects is
// called.
// - For a worker thread, when clearing the main event queue. (Which we do
// slightly later than when the spec notionally calls for it to be done.)
//
// A global may also become temporarily invalid when:
// - For the main thread, if the window is no longer the WindowProxy's current
// inner window due to being placed in the bfcache.
nsresult CheckCurrentGlobalCorrectness() const;
protected:
virtual ~GlobalTeardownObserver();
void BindToOwner(nsIGlobalObject* aOwner);
private:
// The parent global object. The global will clear this when
// it is destroyed by calling DisconnectFromOwner().
nsIGlobalObject* MOZ_NON_OWNING_REF mParentObject = nullptr;
// If mParentObject is or has been an inner window, then this is true. It is
// obtained in BindToOwner.
bool mHasOrHasHadOwnerWindow = false;
};
} // namespace mozilla
#endif
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