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fune/accessible/base/DocManager.cpp
Phil Ringnalda fdc221b30f Backed out changeset 43835f5fa2b2 (bug 1314707) for crashes @ mozilla::a11y::ProxyDestroyed 
MozReview-Commit-ID: 9jIOao58gMQ
2016-11-09 19:33:25 -08:00

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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/. */
#include "DocManager.h"
#include "ApplicationAccessible.h"
#include "ARIAMap.h"
#include "DocAccessible-inl.h"
#include "DocAccessibleChild.h"
#include "DocAccessibleParent.h"
#include "nsAccessibilityService.h"
#include "Platform.h"
#include "RootAccessibleWrap.h"
#include "xpcAccessibleDocument.h"
#ifdef A11Y_LOG
#include "Logging.h"
#endif
#include "mozilla/EventListenerManager.h"
#include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
#include "nsCURILoader.h"
#include "nsDocShellLoadTypes.h"
#include "nsIChannel.h"
#include "nsIDOMDocument.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIWebNavigation.h"
#include "nsServiceManagerUtils.h"
#include "nsIWebProgress.h"
#include "nsCoreUtils.h"
#include "nsXULAppAPI.h"
#include "mozilla/dom/TabChild.h"
using namespace mozilla;
using namespace mozilla::a11y;
using namespace mozilla::dom;
StaticAutoPtr<nsTArray<DocAccessibleParent*>> DocManager::sRemoteDocuments;
nsRefPtrHashtable<nsPtrHashKey<const DocAccessibleParent>, xpcAccessibleDocument>*
DocManager::sRemoteXPCDocumentCache = nullptr;
////////////////////////////////////////////////////////////////////////////////
// DocManager
////////////////////////////////////////////////////////////////////////////////
DocManager::DocManager()
: mDocAccessibleCache(2), mXPCDocumentCache(0)
{
}
////////////////////////////////////////////////////////////////////////////////
// DocManager public
DocAccessible*
DocManager::GetDocAccessible(nsIDocument* aDocument)
{
if (!aDocument)
return nullptr;
DocAccessible* docAcc = GetExistingDocAccessible(aDocument);
if (docAcc)
return docAcc;
return CreateDocOrRootAccessible(aDocument);
}
Accessible*
DocManager::FindAccessibleInCache(nsINode* aNode) const
{
for (auto iter = mDocAccessibleCache.ConstIter(); !iter.Done(); iter.Next()) {
DocAccessible* docAccessible = iter.UserData();
NS_ASSERTION(docAccessible,
"No doc accessible for the object in doc accessible cache!");
if (docAccessible) {
Accessible* accessible = docAccessible->GetAccessible(aNode);
if (accessible) {
return accessible;
}
}
}
return nullptr;
}
void
DocManager::NotifyOfDocumentShutdown(DocAccessible* aDocument,
nsIDocument* aDOMDocument)
{
// We need to remove listeners in both cases, when document is being shutdown
// or when accessibility service is being shut down as well.
RemoveListeners(aDOMDocument);
// Document will already be removed when accessibility service is shutting
// down so we do not need to remove it twice.
if (nsAccessibilityService::IsShutdown()) {
return;
}
xpcAccessibleDocument* xpcDoc = mXPCDocumentCache.GetWeak(aDocument);
if (xpcDoc) {
xpcDoc->Shutdown();
mXPCDocumentCache.Remove(aDocument);
}
mDocAccessibleCache.Remove(aDOMDocument);
}
void
DocManager::NotifyOfRemoteDocShutdown(DocAccessibleParent* aDoc)
{
xpcAccessibleDocument* doc = GetCachedXPCDocument(aDoc);
if (doc) {
doc->Shutdown();
sRemoteXPCDocumentCache->Remove(aDoc);
}
}
xpcAccessibleDocument*
DocManager::GetXPCDocument(DocAccessible* aDocument)
{
if (!aDocument)
return nullptr;
xpcAccessibleDocument* xpcDoc = mXPCDocumentCache.GetWeak(aDocument);
if (!xpcDoc) {
xpcDoc = new xpcAccessibleDocument(aDocument);
mXPCDocumentCache.Put(aDocument, xpcDoc);
}
return xpcDoc;
}
xpcAccessibleDocument*
DocManager::GetXPCDocument(DocAccessibleParent* aDoc)
{
xpcAccessibleDocument* doc = GetCachedXPCDocument(aDoc);
if (doc) {
return doc;
}
if (!sRemoteXPCDocumentCache) {
sRemoteXPCDocumentCache =
new nsRefPtrHashtable<nsPtrHashKey<const DocAccessibleParent>, xpcAccessibleDocument>;
}
doc =
new xpcAccessibleDocument(aDoc, Interfaces::DOCUMENT | Interfaces::HYPERTEXT);
sRemoteXPCDocumentCache->Put(aDoc, doc);
return doc;
}
#ifdef DEBUG
bool
DocManager::IsProcessingRefreshDriverNotification() const
{
for (auto iter = mDocAccessibleCache.ConstIter(); !iter.Done(); iter.Next()) {
DocAccessible* docAccessible = iter.UserData();
NS_ASSERTION(docAccessible,
"No doc accessible for the object in doc accessible cache!");
if (docAccessible && docAccessible->mNotificationController &&
docAccessible->mNotificationController->IsUpdating()) {
return true;
}
}
return false;
}
#endif
////////////////////////////////////////////////////////////////////////////////
// DocManager protected
bool
DocManager::Init()
{
nsCOMPtr<nsIWebProgress> progress =
do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
if (!progress)
return false;
progress->AddProgressListener(static_cast<nsIWebProgressListener*>(this),
nsIWebProgress::NOTIFY_STATE_DOCUMENT);
return true;
}
void
DocManager::Shutdown()
{
nsCOMPtr<nsIWebProgress> progress =
do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
if (progress)
progress->RemoveProgressListener(static_cast<nsIWebProgressListener*>(this));
ClearDocCache();
}
////////////////////////////////////////////////////////////////////////////////
// nsISupports
NS_IMPL_ISUPPORTS(DocManager,
nsIWebProgressListener,
nsIDOMEventListener,
nsISupportsWeakReference)
////////////////////////////////////////////////////////////////////////////////
// nsIWebProgressListener
NS_IMETHODIMP
DocManager::OnStateChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest, uint32_t aStateFlags,
nsresult aStatus)
{
NS_ASSERTION(aStateFlags & STATE_IS_DOCUMENT, "Other notifications excluded");
if (nsAccessibilityService::IsShutdown() || !aWebProgress ||
(aStateFlags & (STATE_START | STATE_STOP)) == 0)
return NS_OK;
nsCOMPtr<mozIDOMWindowProxy> DOMWindow;
aWebProgress->GetDOMWindow(getter_AddRefs(DOMWindow));
NS_ENSURE_STATE(DOMWindow);
nsPIDOMWindowOuter* piWindow = nsPIDOMWindowOuter::From(DOMWindow);
MOZ_ASSERT(piWindow);
nsCOMPtr<nsIDocument> document = piWindow->GetDoc();
NS_ENSURE_STATE(document);
// Document was loaded.
if (aStateFlags & STATE_STOP) {
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocLoad))
logging::DocLoad("document loaded", aWebProgress, aRequest, aStateFlags);
#endif
// Figure out an event type to notify the document has been loaded.
uint32_t eventType = nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_STOPPED;
// Some XUL documents get start state and then stop state with failure
// status when everything is ok. Fire document load complete event in this
// case.
if (NS_SUCCEEDED(aStatus) || !nsCoreUtils::IsContentDocument(document))
eventType = nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE;
// If end consumer has been retargeted for loaded content then do not fire
// any event because it means no new document has been loaded, for example,
// it happens when user clicks on file link.
if (aRequest) {
uint32_t loadFlags = 0;
aRequest->GetLoadFlags(&loadFlags);
if (loadFlags & nsIChannel::LOAD_RETARGETED_DOCUMENT_URI)
eventType = 0;
}
HandleDOMDocumentLoad(document, eventType);
return NS_OK;
}
// Document loading was started.
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocLoad))
logging::DocLoad("start document loading", aWebProgress, aRequest, aStateFlags);
#endif
DocAccessible* docAcc = GetExistingDocAccessible(document);
if (!docAcc)
return NS_OK;
nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(DOMWindow));
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(webNav));
NS_ENSURE_STATE(docShell);
bool isReloading = false;
uint32_t loadType;
docShell->GetLoadType(&loadType);
if (loadType == LOAD_RELOAD_NORMAL ||
loadType == LOAD_RELOAD_BYPASS_CACHE ||
loadType == LOAD_RELOAD_BYPASS_PROXY ||
loadType == LOAD_RELOAD_BYPASS_PROXY_AND_CACHE ||
loadType == LOAD_RELOAD_ALLOW_MIXED_CONTENT) {
isReloading = true;
}
docAcc->NotifyOfLoading(isReloading);
return NS_OK;
}
NS_IMETHODIMP
DocManager::OnProgressChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
int32_t aCurSelfProgress,
int32_t aMaxSelfProgress,
int32_t aCurTotalProgress,
int32_t aMaxTotalProgress)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
DocManager::OnLocationChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest, nsIURI* aLocation,
uint32_t aFlags)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
DocManager::OnStatusChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest, nsresult aStatus,
const char16_t* aMessage)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
DocManager::OnSecurityChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
uint32_t aState)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// nsIDOMEventListener
NS_IMETHODIMP
DocManager::HandleEvent(nsIDOMEvent* aEvent)
{
nsAutoString type;
aEvent->GetType(type);
nsCOMPtr<nsIDocument> document =
do_QueryInterface(aEvent->InternalDOMEvent()->GetTarget());
NS_ASSERTION(document, "pagehide or DOMContentLoaded for non document!");
if (!document)
return NS_OK;
if (type.EqualsLiteral("pagehide")) {
// 'pagehide' event is registered on every DOM document we create an
// accessible for, process the event for the target. This document
// accessible and all its sub document accessible are shutdown as result of
// processing.
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocDestroy))
logging::DocDestroy("received 'pagehide' event", document);
#endif
// Shutdown this one and sub document accessibles.
// We're allowed to not remove listeners when accessible document is
// shutdown since we don't keep strong reference on chrome event target and
// listeners are removed automatically when chrome event target goes away.
DocAccessible* docAccessible = GetExistingDocAccessible(document);
if (docAccessible)
docAccessible->Shutdown();
return NS_OK;
}
// XXX: handle error pages loading separately since they get neither
// webprogress notifications nor 'pageshow' event.
if (type.EqualsLiteral("DOMContentLoaded") &&
nsCoreUtils::IsErrorPage(document)) {
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocLoad))
logging::DocLoad("handled 'DOMContentLoaded' event", document);
#endif
HandleDOMDocumentLoad(document,
nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE);
}
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// DocManager private
void
DocManager::HandleDOMDocumentLoad(nsIDocument* aDocument,
uint32_t aLoadEventType)
{
// Document accessible can be created before we were notified the DOM document
// was loaded completely. However if it's not created yet then create it.
DocAccessible* docAcc = GetExistingDocAccessible(aDocument);
if (!docAcc) {
docAcc = CreateDocOrRootAccessible(aDocument);
if (!docAcc)
return;
}
docAcc->NotifyOfLoad(aLoadEventType);
}
void
DocManager::AddListeners(nsIDocument* aDocument,
bool aAddDOMContentLoadedListener)
{
nsPIDOMWindowOuter* window = aDocument->GetWindow();
EventTarget* target = window->GetChromeEventHandler();
EventListenerManager* elm = target->GetOrCreateListenerManager();
elm->AddEventListenerByType(this, NS_LITERAL_STRING("pagehide"),
TrustedEventsAtCapture());
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocCreate))
logging::Text("added 'pagehide' listener");
#endif
if (aAddDOMContentLoadedListener) {
elm->AddEventListenerByType(this, NS_LITERAL_STRING("DOMContentLoaded"),
TrustedEventsAtCapture());
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocCreate))
logging::Text("added 'DOMContentLoaded' listener");
#endif
}
}
void
DocManager::RemoveListeners(nsIDocument* aDocument)
{
nsPIDOMWindowOuter* window = aDocument->GetWindow();
if (!window)
return;
EventTarget* target = window->GetChromeEventHandler();
if (!target)
return;
EventListenerManager* elm = target->GetOrCreateListenerManager();
elm->RemoveEventListenerByType(this, NS_LITERAL_STRING("pagehide"),
TrustedEventsAtCapture());
elm->RemoveEventListenerByType(this, NS_LITERAL_STRING("DOMContentLoaded"),
TrustedEventsAtCapture());
}
DocAccessible*
DocManager::CreateDocOrRootAccessible(nsIDocument* aDocument)
{
// Ignore hiding, resource documents and documents without docshell.
if (!aDocument->IsVisibleConsideringAncestors() ||
aDocument->IsResourceDoc() || !aDocument->IsActive())
return nullptr;
// Ignore documents without presshell and not having root frame.
nsIPresShell* presShell = aDocument->GetShell();
if (!presShell || presShell->IsDestroying())
return nullptr;
bool isRootDoc = nsCoreUtils::IsRootDocument(aDocument);
DocAccessible* parentDocAcc = nullptr;
if (!isRootDoc) {
// XXXaaronl: ideally we would traverse the presshell chain. Since there's
// no easy way to do that, we cheat and use the document hierarchy.
parentDocAcc = GetDocAccessible(aDocument->GetParentDocument());
NS_ASSERTION(parentDocAcc,
"Can't create an accessible for the document!");
if (!parentDocAcc)
return nullptr;
}
// We only create root accessibles for the true root, otherwise create a
// doc accessible.
RefPtr<DocAccessible> docAcc = isRootDoc ?
new RootAccessibleWrap(aDocument, presShell) :
new DocAccessibleWrap(aDocument, presShell);
// Cache the document accessible into document cache.
mDocAccessibleCache.Put(aDocument, docAcc);
// Initialize the document accessible.
docAcc->Init();
// Bind the document to the tree.
if (isRootDoc) {
if (!ApplicationAcc()->AppendChild(docAcc)) {
docAcc->Shutdown();
return nullptr;
}
// Fire reorder event to notify new accessible document has been attached to
// the tree. The reorder event is delivered after the document tree is
// constructed because event processing and tree construction are done by
// the same document.
// Note: don't use AccReorderEvent to avoid coalsecense and special reorder
// events processing.
docAcc->FireDelayedEvent(nsIAccessibleEvent::EVENT_REORDER,
ApplicationAcc());
if (IPCAccessibilityActive()) {
nsIDocShell* docShell = aDocument->GetDocShell();
if (docShell) {
nsCOMPtr<nsITabChild> tabChild = docShell->GetTabChild();
// XXX We may need to handle the case that we don't have a tab child
// differently. It may be that this will cause us to fail to notify
// the parent process about important accessible documents.
if (tabChild) {
DocAccessibleChild* ipcDoc = new DocAccessibleChild(docAcc);
docAcc->SetIPCDoc(ipcDoc);
static_cast<TabChild*>(tabChild.get())->
SendPDocAccessibleConstructor(ipcDoc, nullptr, 0,
#if defined(XP_WIN)
AccessibleWrap::GetChildIDFor(docAcc)
#else
0
#endif
);
#if defined(XP_WIN)
IAccessibleHolder holder(CreateHolderFromAccessible(docAcc));
ipcDoc->SendCOMProxy(holder);
#endif
}
}
}
} else {
parentDocAcc->BindChildDocument(docAcc);
}
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocCreate)) {
logging::DocCreate("document creation finished", aDocument);
logging::Stack();
}
#endif
AddListeners(aDocument, isRootDoc);
return docAcc;
}
////////////////////////////////////////////////////////////////////////////////
// DocManager static
void
DocManager::ClearDocCache()
{
while (mDocAccessibleCache.Count() > 0) {
auto iter = mDocAccessibleCache.Iter();
MOZ_ASSERT(!iter.Done());
DocAccessible* docAcc = iter.UserData();
NS_ASSERTION(docAcc,
"No doc accessible for the object in doc accessible cache!");
if (docAcc) {
docAcc->Shutdown();
}
iter.Remove();
}
// Ensure that all xpcom accessible documents are shut down as well.
while (mXPCDocumentCache.Count() > 0) {
auto iter = mXPCDocumentCache.Iter();
MOZ_ASSERT(!iter.Done());
xpcAccessibleDocument* xpcDoc = iter.UserData();
NS_ASSERTION(xpcDoc, "No xpc doc for the object in xpc doc cache!");
if (xpcDoc) {
xpcDoc->Shutdown();
}
iter.Remove();
}
}
void
DocManager::RemoteDocAdded(DocAccessibleParent* aDoc)
{
if (!sRemoteDocuments) {
sRemoteDocuments = new nsTArray<DocAccessibleParent*>;
ClearOnShutdown(&sRemoteDocuments);
}
MOZ_ASSERT(!sRemoteDocuments->Contains(aDoc),
"How did we already have the doc!");
sRemoteDocuments->AppendElement(aDoc);
ProxyCreated(aDoc, Interfaces::DOCUMENT | Interfaces::HYPERTEXT);
}
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