author Nika Layzell <>
Thu, 06 Aug 2020 14:04:13 +0000
changeset 544125 ee09cb88af177571304759bc05c760e3d82fd1ed
parent 537954 9dac3cf64ae60633df1b5668dd59872982baaf75
permissions -rw-r--r--
Bug 1656854 - Part 2: Add a BrowsingContextGroup keepalive to BrowserParent shutdown, r=farre In bug 1652085, I added BrowsingContextGroup keepalives while waiting for replies to the discard message, however that message isn't actually sent to the current owner process. Instead, the BrowsingContext is discarded by the PBrowser being destroyed. This should help ensure we also keep the group alive during normal BrowserParent destruction. Differential Revision:

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */

#ifndef nsXULPrototypeDocument_h__
#define nsXULPrototypeDocument_h__

#include "js/TracingAPI.h"
#include "mozilla/Attributes.h"
#include "nsCOMArray.h"
#include "nsCOMPtr.h"
#include "nsTArray.h"
#include "nsISerializable.h"
#include "nsCycleCollectionParticipant.h"
#include <functional>
#include "mozilla/dom/Element.h"

class nsAtom;
class nsIPrincipal;
class nsIURI;
class nsNodeInfoManager;
class nsXULPrototypeElement;
class nsXULPrototypePI;

 * A "prototype" document that stores shared document information
 * for the XUL cache.
 * Among other things, stores the tree of nsXULPrototype*
 * objects, from which the real DOM tree is built later in
 * PrototypeDocumentContentSink::ResumeWalk.
class nsXULPrototypeDocument final : public nsISerializable {
  typedef std::function<void()> Callback;

  // nsISupports interface

  // nsISerializable interface

  nsresult InitPrincipal(nsIURI* aURI, nsIPrincipal* aPrincipal);
  nsIURI* GetURI();

   * Get/set the root nsXULPrototypeElement of the document.
  nsXULPrototypeElement* GetRootElement();
  void SetRootElement(nsXULPrototypeElement* aElement);

   * Add a processing instruction to the prolog. Note that only
   * PI nodes are currently stored in a XUL prototype document's
   * prolog and that they're handled separately from the rest of
   * prototype node tree.
   * @param aPI an already adrefed PI proto to add. This method takes
   *            ownership of the passed PI.
  nsresult AddProcessingInstruction(nsXULPrototypePI* aPI);
   * @note GetProcessingInstructions retains the ownership (the PI
   *       protos only get deleted when the proto document is deleted)
  const nsTArray<RefPtr<nsXULPrototypePI> >& GetProcessingInstructions() const;

  nsIPrincipal* DocumentPrincipal();
  void SetDocumentPrincipal(nsIPrincipal* aPrincipal);

   * If current prototype document has not yet finished loading,
   * appends aDocument to the list of documents to notify (via
   * PrototypeDocumentContentSink::OnPrototypeLoadDone()) and
   * sets aLoaded to false. Otherwise sets aLoaded to true.
  nsresult AwaitLoadDone(Callback&& aCallback, bool* aResult);

   * Notifies each document registered via AwaitLoadDone on this
   * prototype document that the prototype has finished loading.
   * The notification is performed by calling
   * PrototypeDocumentContentSink::OnPrototypeLoadDone on the
   * registered documents.
  nsresult NotifyLoadDone();

  nsNodeInfoManager* GetNodeInfoManager();

  void MarkInCCGeneration(uint32_t aCCGeneration);


  void TraceProtos(JSTracer* aTrc);

  bool WasL10nCached() { return mWasL10nCached; };

  void SetIsL10nCached(bool aIsCached);
  void RebuildPrototypeFromElement(nsXULPrototypeElement* aPrototype,
                                   mozilla::dom::Element* aElement, bool aDeep);
  void RebuildL10nPrototype(mozilla::dom::Element* aElement, bool aDeep);

  nsCOMPtr<nsIURI> mURI;
  RefPtr<nsXULPrototypeElement> mRoot;
  nsTArray<RefPtr<nsXULPrototypePI> > mProcessingInstructions;

  bool mLoaded;
  nsTArray<Callback> mPrototypeWaiters;

  RefPtr<nsNodeInfoManager> mNodeInfoManager;

  uint32_t mCCGeneration;
  uint32_t mGCNumber;

  virtual ~nsXULPrototypeDocument();
  nsresult Init();

  friend NS_IMETHODIMP NS_NewXULPrototypeDocument(
      nsXULPrototypeDocument** aResult);

  static uint32_t gRefCnt;
  bool mWasL10nCached;

#endif  // nsXULPrototypeDocument_h__