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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/. */
/*
* Base class for all element classes and DocumentFragment.
*/
#include "mozilla/ArrayUtils.h"
#include "mozilla/Likely.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/dom/FragmentOrElement.h"
#include "DOMIntersectionObserver.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/DeclarationBlock.h"
#include "mozilla/EffectSet.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/PresShell.h"
#include "mozilla/RestyleManager.h"
#include "mozilla/TextEditor.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/URLExtraData.h"
#include "mozilla/dom/Attr.h"
#include "nsDOMAttributeMap.h"
#include "nsAtom.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/ScriptLoader.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/CustomElementRegistry.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "nsIControllers.h"
#include "nsIDocumentEncoder.h"
#include "nsFocusManager.h"
#include "nsIScriptGlobalObject.h"
#include "nsNetUtil.h"
#include "nsIFrame.h"
#include "nsIAnonymousContentCreator.h"
#include "nsPresContext.h"
#include "nsStyleConsts.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsDOMCID.h"
#include "nsDOMCSSAttrDeclaration.h"
#include "nsNameSpaceManager.h"
#include "nsContentList.h"
#include "nsDOMTokenList.h"
#include "nsError.h"
#include "nsDOMString.h"
#include "nsXULElement.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/MouseEvents.h"
#include "nsAttrValueOrString.h"
#include "nsQueryObject.h"
#ifdef MOZ_XUL
# include "nsXULElement.h"
#endif /* MOZ_XUL */
#include "nsFrameSelection.h"
#ifdef DEBUG
# include "nsRange.h"
#endif
#include "nsFrameLoader.h"
#include "nsPIDOMWindow.h"
#include "nsLayoutUtils.h"
#include "nsGkAtoms.h"
#include "nsContentUtils.h"
#include "nsTextFragment.h"
#include "nsContentCID.h"
#include "nsWindowSizes.h"
#include "nsIWidget.h"
#include "nsNodeInfoManager.h"
#include "nsGenericHTMLElement.h"
#include "nsContentCreatorFunctions.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsIScrollableFrame.h"
#include "ChildIterator.h"
#include "nsTextNode.h"
#include "mozilla/dom/NodeListBinding.h"
#include "nsCCUncollectableMarker.h"
#include "mozAutoDocUpdate.h"
#include "mozilla/Sprintf.h"
#include "nsDOMMutationObserver.h"
#include "nsWrapperCacheInlines.h"
#include "nsCycleCollector.h"
#include "xpcpublic.h"
#include "mozilla/Telemetry.h"
#include "mozilla/CORSMode.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "mozilla/dom/HTMLTemplateElement.h"
#include "mozilla/dom/SVGUseElement.h"
#include "nsStyledElement.h"
#include "nsIContentInlines.h"
#include "nsChildContentList.h"
#include "mozilla/BloomFilter.h"
#include "NodeUbiReporting.h"
using namespace mozilla;
using namespace mozilla::dom;
int32_t nsIContent::sTabFocusModel = eTabFocus_any;
bool nsIContent::sTabFocusModelAppliesToXUL = false;
uint64_t nsMutationGuard::sGeneration = 0;
NS_IMPL_CYCLE_COLLECTION_CLASS(nsIContent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsIContent)
MOZ_ASSERT_UNREACHABLE("Our subclasses don't call us");
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsIContent)
MOZ_ASSERT_UNREACHABLE("Our subclasses don't call us");
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN(nsIContent)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
// Don't bother to QI to cycle collection, because our CC impl is
// not doing anything anyway.
NS_INTERFACE_MAP_ENTRY(nsIContent)
NS_INTERFACE_MAP_ENTRY(nsINode)
NS_INTERFACE_MAP_ENTRY(mozilla::dom::EventTarget)
NS_INTERFACE_MAP_ENTRY_TEAROFF(nsISupportsWeakReference,
new nsNodeSupportsWeakRefTearoff(this))
// DOM bindings depend on the identity pointer being the
// same as nsINode (which nsIContent inherits).
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_MAIN_THREAD_ONLY_CYCLE_COLLECTING_ADDREF(nsIContent)
NS_IMPL_DOMARENA_DESTROY(nsIContent)
NS_IMPL_MAIN_THREAD_ONLY_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE_AND_DESTROY(
nsIContent, LastRelease(), Destroy())
nsIContent* nsIContent::FindFirstNonChromeOnlyAccessContent() const {
// This handles also nested native anonymous content.
for (const nsIContent* content = this; content;
content = content->GetChromeOnlyAccessSubtreeRootParent()) {
if (!content->ChromeOnlyAccess()) {
// Oops, this function signature allows casting const to
// non-const. (Then again, so does GetFirstChild()->GetParent().)
return const_cast<nsIContent*>(content);
}
}
return nullptr;
}
HTMLSlotElement* nsIContent::GetAssignedSlotByMode() const {
/**
* Get slotable's assigned slot for the result of
* find a slot with open flag UNSET [1].
*
*/
HTMLSlotElement* slot = GetAssignedSlot();
if (!slot) {
return nullptr;
}
MOZ_ASSERT(GetParent());
MOZ_ASSERT(GetParent()->GetShadowRoot());
/**
* Additional check for open flag SET:
* If slotable’s parent’s shadow root's mode is not "open",
* then return null.
*/
if (GetParent()->GetShadowRoot()->IsClosed()) {
return nullptr;
}
return slot;
}
nsIContent::IMEState nsIContent::GetDesiredIMEState() {
if (!IsEditable()) {
// Check for the special case where we're dealing with elements which don't
// have the editable flag set, but are readwrite (such as text controls).
if (!IsElement() ||
!AsElement()->State().HasState(NS_EVENT_STATE_READWRITE)) {
return IMEState(IMEEnabled::Disabled);
}
}
// NOTE: The content for independent editors (e.g., input[type=text],
// textarea) must override this method, so, we don't need to worry about
// that here.
nsIContent* editableAncestor = GetEditingHost();
// This is in another editable content, use the result of it.
if (editableAncestor && editableAncestor != this) {
return editableAncestor->GetDesiredIMEState();
}
Document* doc = GetComposedDoc();
if (!doc) {
return IMEState(IMEEnabled::Disabled);
}
nsPresContext* pc = doc->GetPresContext();
if (!pc) {
return IMEState(IMEEnabled::Disabled);
}
HTMLEditor* htmlEditor = nsContentUtils::GetHTMLEditor(pc);
if (!htmlEditor) {
return IMEState(IMEEnabled::Disabled);
}
IMEState state;
htmlEditor->GetPreferredIMEState(&state);
return state;
}
bool nsIContent::HasIndependentSelection() const {
nsIFrame* frame = GetPrimaryFrame();
return (frame && frame->GetStateBits() & NS_FRAME_INDEPENDENT_SELECTION);
}
dom::Element* nsIContent::GetEditingHost() {
// If this isn't editable, return nullptr.
if (!IsEditable()) {
return nullptr;
}
Document* doc = GetComposedDoc();
if (!doc) {
return nullptr;
}
// If this is in designMode, we should return <body>
if (doc->HasFlag(NODE_IS_EDITABLE) && !IsInShadowTree()) {
return doc->GetBodyElement();
}
nsIContent* content = this;
for (dom::Element* parent = GetParentElement();
parent && parent->HasFlag(NODE_IS_EDITABLE);
parent = content->GetParentElement()) {
content = parent;
}
return content->AsElement();
}
nsresult nsIContent::LookupNamespaceURIInternal(
const nsAString& aNamespacePrefix, nsAString& aNamespaceURI) const {
if (aNamespacePrefix.EqualsLiteral("xml")) {
// Special-case for xml prefix
aNamespaceURI.AssignLiteral("http://www.w3.org/XML/1998/namespace");
return NS_OK;
}
if (aNamespacePrefix.EqualsLiteral("xmlns")) {
// Special-case for xmlns prefix
aNamespaceURI.AssignLiteral("http://www.w3.org/2000/xmlns/");
return NS_OK;
}
RefPtr<nsAtom> name;
if (!aNamespacePrefix.IsEmpty()) {
name = NS_Atomize(aNamespacePrefix);
NS_ENSURE_TRUE(name, NS_ERROR_OUT_OF_MEMORY);
} else {
name = nsGkAtoms::xmlns;
}
// Trace up the content parent chain looking for the namespace
// declaration that declares aNamespacePrefix.
for (Element* element = GetAsElementOrParentElement(); element;
element = element->GetParentElement()) {
if (element->GetAttr(kNameSpaceID_XMLNS, name, aNamespaceURI)) {
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
nsAtom* nsIContent::GetLang() const {
for (const Element* element = GetAsElementOrParentElement(); element;
element = element->GetParentElement()) {
if (!element->GetAttrCount()) {
continue;
}
// xml:lang has precedence over lang on HTML elements (see
// XHTML1 section C.7).
const nsAttrValue* attr =
element->GetParsedAttr(nsGkAtoms::lang, kNameSpaceID_XML);
if (!attr && element->SupportsLangAttr()) {
attr = element->GetParsedAttr(nsGkAtoms::lang);
}
if (attr) {
MOZ_ASSERT(attr->Type() == nsAttrValue::eAtom);
MOZ_ASSERT(attr->GetAtomValue());
return attr->GetAtomValue();
}
}
return nullptr;
}
nsIURI* nsIContent::GetBaseURI(bool aTryUseXHRDocBaseURI) const {
if (SVGUseElement* use = GetContainingSVGUseShadowHost()) {
if (URLExtraData* data = use->GetContentURLData()) {
return data->BaseURI();
}
}
return OwnerDoc()->GetBaseURI(aTryUseXHRDocBaseURI);
}
nsIURI* nsIContent::GetBaseURIForStyleAttr() const {
if (SVGUseElement* use = GetContainingSVGUseShadowHost()) {
if (URLExtraData* data = use->GetContentURLData()) {
return data->BaseURI();
}
}
// This also ignores the case that SVG inside XBL binding.
// But it is probably fine.
return OwnerDoc()->GetDocBaseURI();
}
already_AddRefed<URLExtraData> nsIContent::GetURLDataForStyleAttr(
nsIPrincipal* aSubjectPrincipal) const {
if (SVGUseElement* use = GetContainingSVGUseShadowHost()) {
if (URLExtraData* data = use->GetContentURLData()) {
return do_AddRef(data);
}
}
if (aSubjectPrincipal && aSubjectPrincipal != NodePrincipal()) {
// TODO: Cache this?
nsCOMPtr<nsIReferrerInfo> referrerInfo =
ReferrerInfo::CreateForInternalCSSResources(OwnerDoc());
return MakeAndAddRef<URLExtraData>(OwnerDoc()->GetDocBaseURI(),
referrerInfo, aSubjectPrincipal);
}
// This also ignores the case that SVG inside XBL binding.
// But it is probably fine.
return do_AddRef(OwnerDoc()->DefaultStyleAttrURLData());
}
void nsIContent::ConstructUbiNode(void* storage) {
JS::ubi::Concrete<nsIContent>::construct(storage, this);
}
//----------------------------------------------------------------------
static inline JSObject* GetJSObjectChild(nsWrapperCache* aCache) {
return aCache->PreservingWrapper() ? aCache->GetWrapperPreserveColor()
: nullptr;
}
static bool NeedsScriptTraverse(nsINode* aNode) {
return aNode->PreservingWrapper() && aNode->GetWrapperPreserveColor() &&
!aNode->HasKnownLiveWrapperAndDoesNotNeedTracing(aNode);
}
//----------------------------------------------------------------------
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsAttrChildContentList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsAttrChildContentList)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsAttrChildContentList, mNode)
// If the wrapper is known-live, the list can't be part of a garbage cycle.
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsAttrChildContentList)
return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsAttrChildContentList)
return tmp->HasKnownLiveWrapperAndDoesNotNeedTracing(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsAttrChildContentList)
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
NS_INTERFACE_TABLE_HEAD(nsAttrChildContentList)
NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
NS_INTERFACE_TABLE(nsAttrChildContentList, nsINodeList)
NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(nsAttrChildContentList)
NS_INTERFACE_MAP_END
JSObject* nsAttrChildContentList::WrapObject(
JSContext* cx, JS::Handle<JSObject*> aGivenProto) {
return NodeList_Binding::Wrap(cx, this, aGivenProto);
}
uint32_t nsAttrChildContentList::Length() {
return mNode ? mNode->GetChildCount() : 0;
}
nsIContent* nsAttrChildContentList::Item(uint32_t aIndex) {
if (mNode) {
return mNode->GetChildAt_Deprecated(aIndex);
}
return nullptr;
}
int32_t nsAttrChildContentList::IndexOf(nsIContent* aContent) {
if (mNode) {
return mNode->ComputeIndexOf(aContent);
}
return -1;
}
//----------------------------------------------------------------------
uint32_t nsParentNodeChildContentList::Length() {
if (!mIsCacheValid && !ValidateCache()) {
return 0;
}
MOZ_ASSERT(mIsCacheValid);
return mCachedChildArray.Length();
}
nsIContent* nsParentNodeChildContentList::Item(uint32_t aIndex) {
if (!mIsCacheValid && !ValidateCache()) {
return nullptr;
}
MOZ_ASSERT(mIsCacheValid);
return mCachedChildArray.SafeElementAt(aIndex, nullptr);
}
int32_t nsParentNodeChildContentList::IndexOf(nsIContent* aContent) {
if (!mIsCacheValid && !ValidateCache()) {
return -1;
}
MOZ_ASSERT(mIsCacheValid);
return mCachedChildArray.IndexOf(aContent);
}
bool nsParentNodeChildContentList::ValidateCache() {
MOZ_ASSERT(!mIsCacheValid);
MOZ_ASSERT(mCachedChildArray.IsEmpty());
nsINode* parent = GetParentObject();
if (!parent) {
return false;
}
for (nsIContent* node = parent->GetFirstChild(); node;
node = node->GetNextSibling()) {
mCachedChildArray.AppendElement(node);
}
mIsCacheValid = true;
return true;
}
//----------------------------------------------------------------------
nsIHTMLCollection* FragmentOrElement::Children() {
nsDOMSlots* slots = DOMSlots();
if (!slots->mChildrenList) {
slots->mChildrenList =
new nsContentList(this, kNameSpaceID_Wildcard, nsGkAtoms::_asterisk,
nsGkAtoms::_asterisk, false);
}
return slots->mChildrenList;
}
//----------------------------------------------------------------------
NS_IMPL_CYCLE_COLLECTION(nsNodeSupportsWeakRefTearoff, mNode)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsNodeSupportsWeakRefTearoff)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END_AGGREGATED(mNode)
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsNodeSupportsWeakRefTearoff)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsNodeSupportsWeakRefTearoff)
NS_IMETHODIMP
nsNodeSupportsWeakRefTearoff::GetWeakReference(
nsIWeakReference** aInstancePtr) {
nsINode::nsSlots* slots = mNode->Slots();
if (!slots->mWeakReference) {
slots->mWeakReference = new nsNodeWeakReference(mNode);
}
NS_ADDREF(*aInstancePtr = slots->mWeakReference);
return NS_OK;
}
//----------------------------------------------------------------------
static const size_t MaxDOMSlotSizeAllowed =
#ifdef HAVE_64BIT_BUILD
128;
#else
64;
#endif
static_assert(sizeof(nsINode::nsSlots) <= MaxDOMSlotSizeAllowed,
"DOM slots cannot be grown without consideration");
static_assert(sizeof(FragmentOrElement::nsDOMSlots) <= MaxDOMSlotSizeAllowed,
"DOM slots cannot be grown without consideration");
void nsIContent::nsExtendedContentSlots::UnlinkExtendedSlots() {
mContainingShadow = nullptr;
mAssignedSlot = nullptr;
}
void nsIContent::nsExtendedContentSlots::TraverseExtendedSlots(
nsCycleCollectionTraversalCallback& aCb) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mExtendedSlots->mContainingShadow");
aCb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mContainingShadow));
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mExtendedSlots->mAssignedSlot");
aCb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mAssignedSlot.get()));
}
nsIContent::nsExtendedContentSlots::nsExtendedContentSlots() = default;
nsIContent::nsExtendedContentSlots::~nsExtendedContentSlots() {
MOZ_ASSERT(!mManualSlotAssignment);
}
size_t nsIContent::nsExtendedContentSlots::SizeOfExcludingThis(
MallocSizeOf aMallocSizeOf) const {
// For now, nothing to measure here. We don't actually own any of our
// members.
return 0;
}
FragmentOrElement::nsDOMSlots::nsDOMSlots()
: nsIContent::nsContentSlots(), mDataset(nullptr) {
MOZ_COUNT_CTOR(nsDOMSlots);
}
FragmentOrElement::nsDOMSlots::~nsDOMSlots() {
MOZ_COUNT_DTOR(nsDOMSlots);
if (mAttributeMap) {
mAttributeMap->DropReference();
}
}
void FragmentOrElement::nsDOMSlots::Traverse(
nsCycleCollectionTraversalCallback& aCb) {
nsIContent::nsContentSlots::Traverse(aCb);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mSlots->mStyle");
aCb.NoteXPCOMChild(mStyle.get());
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mSlots->mAttributeMap");
aCb.NoteXPCOMChild(mAttributeMap.get());
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mSlots->mChildrenList");
aCb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsINodeList*, mChildrenList));
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mSlots->mClassList");
aCb.NoteXPCOMChild(mClassList.get());
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mSlots->mPart");
aCb.NoteXPCOMChild(mPart.get());
}
void FragmentOrElement::nsDOMSlots::Unlink() {
nsIContent::nsContentSlots::Unlink();
mStyle = nullptr;
if (mAttributeMap) {
mAttributeMap->DropReference();
mAttributeMap = nullptr;
}
mChildrenList = nullptr;
mClassList = nullptr;
mPart = nullptr;
}
size_t FragmentOrElement::nsDOMSlots::SizeOfIncludingThis(
MallocSizeOf aMallocSizeOf) const {
size_t n = aMallocSizeOf(this);
nsExtendedContentSlots* extendedSlots = GetExtendedContentSlots();
if (extendedSlots) {
if (OwnsExtendedSlots()) {
n += aMallocSizeOf(extendedSlots);
}
n += extendedSlots->SizeOfExcludingThis(aMallocSizeOf);
}
if (mAttributeMap) {
n += mAttributeMap->SizeOfIncludingThis(aMallocSizeOf);
}
if (mChildrenList) {
n += mChildrenList->SizeOfIncludingThis(aMallocSizeOf);
}
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - Superclass members (nsINode::nsSlots)
// - mStyle
// - mDataSet
// - mClassList
// The following member are not measured:
// - mControllers: because it is non-owning
return n;
}
FragmentOrElement::nsExtendedDOMSlots::nsExtendedDOMSlots() = default;
FragmentOrElement::nsExtendedDOMSlots::~nsExtendedDOMSlots() = default;
void FragmentOrElement::nsExtendedDOMSlots::UnlinkExtendedSlots() {
nsIContent::nsExtendedContentSlots::UnlinkExtendedSlots();
// Don't clear mXBLBinding, it'll be done in
// BindingManager::RemovedFromDocument from FragmentOrElement::Unlink.
//
// mShadowRoot will similarly be cleared explicitly from
// FragmentOrElement::Unlink.
mSMILOverrideStyle = nullptr;
mControllers = nullptr;
mLabelsList = nullptr;
if (mCustomElementData) {
mCustomElementData->Unlink();
mCustomElementData = nullptr;
}
}
void FragmentOrElement::nsExtendedDOMSlots::TraverseExtendedSlots(
nsCycleCollectionTraversalCallback& aCb) {
nsIContent::nsExtendedContentSlots::TraverseExtendedSlots(aCb);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mExtendedSlots->mSMILOverrideStyle");
aCb.NoteXPCOMChild(mSMILOverrideStyle.get());
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mExtendedSlots->mControllers");
aCb.NoteXPCOMChild(mControllers);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mExtendedSlots->mLabelsList");
aCb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsINodeList*, mLabelsList));
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mExtendedSlots->mShadowRoot");
aCb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mShadowRoot));
if (mCustomElementData) {
mCustomElementData->Traverse(aCb);
}
}
size_t FragmentOrElement::nsExtendedDOMSlots::SizeOfExcludingThis(
MallocSizeOf aMallocSizeOf) const {
size_t n =
nsIContent::nsExtendedContentSlots::SizeOfExcludingThis(aMallocSizeOf);
// We own mSMILOverrideStyle but there seems to be no memory reporting on CSS
// declarations? At least report the memory the declaration takes up
// directly.
if (mSMILOverrideStyle) {
n += aMallocSizeOf(mSMILOverrideStyle);
}
// We don't really own mSMILOverrideStyleDeclaration. mSMILOverrideStyle owns
// it.
// We don't seem to have memory reporting for nsXULControllers. At least
// report the memory it's using directly.
if (mControllers) {
n += aMallocSizeOf(mControllers);
}
if (mLabelsList) {
n += mLabelsList->SizeOfIncludingThis(aMallocSizeOf);
}
// mShadowRoot should be handled during normal DOM tree memory reporting, just
// like kids, siblings, etc.
if (mCustomElementData) {
n += mCustomElementData->SizeOfIncludingThis(aMallocSizeOf);
}
return n;
}
FragmentOrElement::FragmentOrElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsIContent(std::move(aNodeInfo)) {}
FragmentOrElement::~FragmentOrElement() {
MOZ_ASSERT(!IsInUncomposedDoc(),
"Please remove this from the document properly");
if (GetParent()) {
NS_RELEASE(mParent);
}
}
already_AddRefed<nsINodeList> FragmentOrElement::GetChildren(uint32_t aFilter) {
RefPtr<nsSimpleContentList> list = new nsSimpleContentList(this);
AllChildrenIterator iter(this, aFilter);
while (nsIContent* kid = iter.GetNextChild()) {
list->AppendElement(kid);
}
return list.forget();
}
static nsINode* FindChromeAccessOnlySubtreeOwner(nsINode* aNode) {
if (!aNode->ChromeOnlyAccess()) {
return aNode;
}
while (aNode && !aNode->IsRootOfChromeAccessOnlySubtree()) {
aNode = aNode->GetParentNode();
}
return aNode ? aNode->GetParentOrShadowHostNode() : nullptr;
}
already_AddRefed<nsINode> FindChromeAccessOnlySubtreeOwner(
EventTarget* aTarget) {
nsCOMPtr<nsINode> node = do_QueryInterface(aTarget);
if (!node || !node->ChromeOnlyAccess()) {
return node.forget();
}
node = FindChromeAccessOnlySubtreeOwner(node);
return node.forget();
}
void nsIContent::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
// FIXME! Document how this event retargeting works, Bug 329124.
aVisitor.mCanHandle = true;
aVisitor.mMayHaveListenerManager = HasListenerManager();
if (IsInShadowTree()) {
aVisitor.mItemInShadowTree = true;
}
// Don't propagate mouseover and mouseout events when mouse is moving
// inside chrome access only content.
bool isAnonForEvents = IsRootOfChromeAccessOnlySubtree();
aVisitor.mRootOfClosedTree = isAnonForEvents;
if ((aVisitor.mEvent->mMessage == eMouseOver ||
aVisitor.mEvent->mMessage == eMouseOut ||
aVisitor.mEvent->mMessage == ePointerOver ||
aVisitor.mEvent->mMessage == ePointerOut) &&
// Check if we should stop event propagation when event has just been
// dispatched or when we're about to propagate from
// chrome access only subtree or if we are about to propagate out of
// a shadow root to a shadow root host.
((this == aVisitor.mEvent->mOriginalTarget && !ChromeOnlyAccess()) ||
isAnonForEvents)) {
nsCOMPtr<nsIContent> relatedTarget =
do_QueryInterface(aVisitor.mEvent->AsMouseEvent()->mRelatedTarget);
if (relatedTarget && relatedTarget->OwnerDoc() == OwnerDoc()) {
// If current target is anonymous for events or we know that related
// target is descendant of an element which is anonymous for events,
// we may want to stop event propagation.
// If this is the original target, aVisitor.mRelatedTargetIsInAnon
// must be updated.
if (isAnonForEvents || aVisitor.mRelatedTargetIsInAnon ||
(aVisitor.mEvent->mOriginalTarget == this &&
(aVisitor.mRelatedTargetIsInAnon =
relatedTarget->ChromeOnlyAccess()))) {
nsINode* anonOwner = FindChromeAccessOnlySubtreeOwner(this);
if (anonOwner) {
nsINode* anonOwnerRelated =
FindChromeAccessOnlySubtreeOwner(relatedTarget);
if (anonOwnerRelated) {
// Note, anonOwnerRelated may still be inside some other
// native anonymous subtree. The case where anonOwner is still
// inside native anonymous subtree will be handled when event
// propagates up in the DOM tree.
while (anonOwner != anonOwnerRelated &&
anonOwnerRelated->ChromeOnlyAccess()) {
anonOwnerRelated =
FindChromeAccessOnlySubtreeOwner(anonOwnerRelated);
}
if (anonOwner == anonOwnerRelated) {
#ifdef DEBUG_smaug
nsCOMPtr<nsIContent> originalTarget =
do_QueryInterface(aVisitor.mEvent->mOriginalTarget);
nsAutoString ot, ct, rt;
if (originalTarget) {
originalTarget->NodeInfo()->NameAtom()->ToString(ot);
}
NodeInfo()->NameAtom()->ToString(ct);
relatedTarget->NodeInfo()->NameAtom()->ToString(rt);
printf(
"Stopping %s propagation:"
"\n\toriginalTarget=%s \n\tcurrentTarget=%s %s"
"\n\trelatedTarget=%s %s \n%s",
(aVisitor.mEvent->mMessage == eMouseOver) ? "mouseover"
: "mouseout",
NS_ConvertUTF16toUTF8(ot).get(),
NS_ConvertUTF16toUTF8(ct).get(),
isAnonForEvents
? "(is native anonymous)"
: (ChromeOnlyAccess() ? "(is in native anonymous subtree)"
: ""),
NS_ConvertUTF16toUTF8(rt).get(),
relatedTarget->ChromeOnlyAccess()
? "(is in native anonymous subtree)"
: "",
(originalTarget &&
relatedTarget->FindFirstNonChromeOnlyAccessContent() ==
originalTarget->FindFirstNonChromeOnlyAccessContent())
? ""
: "Wrong event propagation!?!\n");
#endif
aVisitor.SetParentTarget(nullptr, false);
// Event should not propagate to non-anon content.
aVisitor.mCanHandle = isAnonForEvents;
return;
}
}
}
}
}
}
// Event parent is the assigned slot, if node is assigned, or node's parent
// otherwise.
HTMLSlotElement* slot = GetAssignedSlot();
nsIContent* parent = slot ? slot : GetParent();
// Event may need to be retargeted if this is the root of a native
// anonymous content subtree or event is dispatched somewhere inside XBL.
if (isAnonForEvents) {
#ifdef DEBUG
// If a DOM event is explicitly dispatched using node.dispatchEvent(), then
// all the events are allowed even in the native anonymous content..
nsCOMPtr<nsIContent> t =
do_QueryInterface(aVisitor.mEvent->mOriginalTarget);
NS_ASSERTION(!t || !t->ChromeOnlyAccess() ||
aVisitor.mEvent->mClass != eMutationEventClass ||
aVisitor.mDOMEvent,
"Mutation event dispatched in native anonymous content!?!");
#endif
aVisitor.mEventTargetAtParent = parent;
} else if (parent && aVisitor.mOriginalTargetIsInAnon) {
nsCOMPtr<nsIContent> content(do_QueryInterface(aVisitor.mEvent->mTarget));
if (content &&
content->GetClosestNativeAnonymousSubtreeRootParent() == parent) {
aVisitor.mEventTargetAtParent = parent;
}
}
if (!aVisitor.mEvent->mFlags.mComposedInNativeAnonymousContent &&
IsRootOfNativeAnonymousSubtree() && OwnerDoc()->GetWindow()) {
aVisitor.SetParentTarget(OwnerDoc()->GetWindow()->GetParentTarget(), true);
} else if (parent) {
aVisitor.SetParentTarget(parent, false);
if (slot) {
ShadowRoot* root = slot->GetContainingShadow();
if (root && root->IsClosed()) {
aVisitor.mParentIsSlotInClosedTree = true;
}
}
} else {
aVisitor.SetParentTarget(GetComposedDoc(), false);
}
if (!ChromeOnlyAccess() && !aVisitor.mRelatedTargetRetargetedInCurrentScope) {
// We don't support Shadow DOM in native anonymous content yet.
aVisitor.mRelatedTargetRetargetedInCurrentScope = true;
if (aVisitor.mEvent->mOriginalRelatedTarget) {
// Step 3.
// "Let relatedTarget be the result of retargeting event's relatedTarget
// against target if event's relatedTarget is non-null, and null
// otherwise."
//
// This is a bit complicated because the event might be from native
// anonymous content, but we need to deal with non-native anonymous
// content there.
bool initialTarget = this == aVisitor.mEvent->mOriginalTarget;
nsCOMPtr<nsINode> originalTargetAsNode;
// Use of mOriginalTargetIsInAnon is an optimization here.
if (!initialTarget && aVisitor.mOriginalTargetIsInAnon) {
originalTargetAsNode =
FindChromeAccessOnlySubtreeOwner(aVisitor.mEvent->mOriginalTarget);
initialTarget = originalTargetAsNode == this;
}
if (initialTarget) {
nsCOMPtr<nsINode> relatedTargetAsNode =
FindChromeAccessOnlySubtreeOwner(
aVisitor.mEvent->mOriginalRelatedTarget);
if (!originalTargetAsNode) {
originalTargetAsNode =
do_QueryInterface(aVisitor.mEvent->mOriginalTarget);
}
if (relatedTargetAsNode && originalTargetAsNode) {
nsINode* retargetedRelatedTarget = nsContentUtils::Retarget(
relatedTargetAsNode, originalTargetAsNode);
if (originalTargetAsNode == retargetedRelatedTarget &&
retargetedRelatedTarget != relatedTargetAsNode) {
// Step 4.
// "If target is relatedTarget and target is not event's
// relatedTarget, then return true."
aVisitor.IgnoreCurrentTargetBecauseOfShadowDOMRetargeting();
// Old code relies on mTarget to point to the first element which
// was not added to the event target chain because of mCanHandle
// being false, but in Shadow DOM case mTarget really should
// point to a node in Shadow DOM.
aVisitor.mEvent->mTarget = aVisitor.mTargetInKnownToBeHandledScope;
return;
}
// Part of step 5. Retargeting target has happened already higher
// up in this method.
// "Append to an event path with event, target, targetOverride,
// relatedTarget, and false."
aVisitor.mRetargetedRelatedTarget = retargetedRelatedTarget;
}
} else {
nsCOMPtr<nsINode> relatedTargetAsNode =
FindChromeAccessOnlySubtreeOwner(
aVisitor.mEvent->mOriginalRelatedTarget);
if (relatedTargetAsNode) {
// Step 11.3.
// "Let relatedTarget be the result of retargeting event's
// relatedTarget against parent if event's relatedTarget is non-null,
// and null otherwise.".
nsINode* retargetedRelatedTarget =
nsContentUtils::Retarget(relatedTargetAsNode, this);
nsCOMPtr<nsINode> targetInKnownToBeHandledScope =
FindChromeAccessOnlySubtreeOwner(
aVisitor.mTargetInKnownToBeHandledScope);
// If aVisitor.mTargetInKnownToBeHandledScope wasn't nsINode,
// targetInKnownToBeHandledScope will be null. This may happen when
// dispatching event to Window object in a content page and
// propagating the event to a chrome Element.
if (targetInKnownToBeHandledScope &&
IsShadowIncludingInclusiveDescendantOf(
targetInKnownToBeHandledScope->SubtreeRoot())) {
// Part of step 11.4.
// "If target's root is a shadow-including inclusive ancestor of
// parent, then"
// "...Append to an event path with event, parent, null,
// relatedTarget, " and slot-in-closed-tree."
aVisitor.mRetargetedRelatedTarget = retargetedRelatedTarget;
} else if (this == retargetedRelatedTarget) {
// Step 11.5
// "Otherwise, if parent and relatedTarget are identical, then set
// parent to null."
aVisitor.IgnoreCurrentTargetBecauseOfShadowDOMRetargeting();
// Old code relies on mTarget to point to the first element which
// was not added to the event target chain because of mCanHandle
// being false, but in Shadow DOM case mTarget really should
// point to a node in Shadow DOM.
aVisitor.mEvent->mTarget = aVisitor.mTargetInKnownToBeHandledScope;
return;
} else if (targetInKnownToBeHandledScope) {
// Note, if targetInKnownToBeHandledScope is null,
// mTargetInKnownToBeHandledScope could be Window object in content
// page and we're in chrome document in the same process.
// Step 11.6
aVisitor.mRetargetedRelatedTarget = retargetedRelatedTarget;
}
}
}
}
if (aVisitor.mEvent->mClass == eTouchEventClass) {
// Retarget touch objects.
MOZ_ASSERT(!aVisitor.mRetargetedTouchTargets.isSome());
aVisitor.mRetargetedTouchTargets.emplace();
WidgetTouchEvent* touchEvent = aVisitor.mEvent->AsTouchEvent();
WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
Touch* touch = touches[i];
EventTarget* originalTarget = touch->mOriginalTarget;
EventTarget* touchTarget = originalTarget;
nsCOMPtr<nsINode> targetAsNode = do_QueryInterface(originalTarget);
if (targetAsNode) {
EventTarget* retargeted =
nsContentUtils::Retarget(targetAsNode, this);
if (retargeted) {
touchTarget = retargeted;
}
}
aVisitor.mRetargetedTouchTargets->AppendElement(touchTarget);
touch->mTarget = touchTarget;
}
MOZ_ASSERT(aVisitor.mRetargetedTouchTargets->Length() ==
touches.Length());
}
}
if (slot) {
// Inform that we're about to exit the current scope.
aVisitor.mRelatedTargetRetargetedInCurrentScope = false;
}
}
bool nsIContent::IsFocusable(int32_t* aTabIndex, bool aWithMouse) {
bool focusable = IsFocusableInternal(aTabIndex, aWithMouse);
// Ensure that the return value and aTabIndex are consistent in the case
// we're in userfocusignored context.
if (focusable || (aTabIndex && *aTabIndex != -1)) {
return focusable;
}
return false;
}
bool nsIContent::IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse) {
if (aTabIndex) {
*aTabIndex = -1; // Default, not tabbable
}
return false;
}
bool FragmentOrElement::IsLink(nsIURI** aURI) const {
*aURI = nullptr;
return false;
}
void nsIContent::SetAssignedSlot(HTMLSlotElement* aSlot) {
MOZ_ASSERT(aSlot || GetExistingExtendedContentSlots());
ExtendedContentSlots()->mAssignedSlot = aSlot;
}
#ifdef MOZ_DOM_LIST
void nsIContent::Dump() { List(); }
#endif
void FragmentOrElement::GetTextContentInternal(nsAString& aTextContent,
OOMReporter& aError) {
if (!nsContentUtils::GetNodeTextContent(this, true, aTextContent, fallible)) {
aError.ReportOOM();
}
}
void FragmentOrElement::SetTextContentInternal(const nsAString& aTextContent,
nsIPrincipal* aSubjectPrincipal,
ErrorResult& aError) {
aError = nsContentUtils::SetNodeTextContent(this, aTextContent, false);
}
void FragmentOrElement::DestroyContent() {
// Drop any servo data. We do this before the RemovedFromDocument call below
// so that it doesn't need to try to keep the style state sane when shuffling
// around the flattened tree.
//
// TODO(emilio): I suspect this can be asserted against instead, with a bit of
// effort to avoid calling Document::Destroy with a shell...
if (IsElement()) {
AsElement()->ClearServoData();
}
#ifdef DEBUG
uint32_t oldChildCount = GetChildCount();
#endif
for (nsIContent* child = GetFirstChild(); child;
child = child->GetNextSibling()) {
child->DestroyContent();
MOZ_ASSERT(child->GetParent() == this,
"Mutating the tree during XBL destructors is evil");
}
MOZ_ASSERT(oldChildCount == GetChildCount(),
"Mutating the tree during XBL destructors is evil");
if (ShadowRoot* shadowRoot = GetShadowRoot()) {
shadowRoot->DestroyContent();
}
}
void FragmentOrElement::SaveSubtreeState() {
for (nsIContent* child = GetFirstChild(); child;
child = child->GetNextSibling()) {
child->SaveSubtreeState();
}
// FIXME(bug 1469277): Pretty sure this wants to dig into shadow trees as
// well.
}
//----------------------------------------------------------------------
// Generic DOMNode implementations
void FragmentOrElement::FireNodeInserted(
Document* aDoc, nsINode* aParent, nsTArray<nsCOMPtr<nsIContent>>& aNodes) {
uint32_t count = aNodes.Length();
for (uint32_t i = 0; i < count; ++i) {
nsIContent* childContent = aNodes[i];
if (nsContentUtils::HasMutationListeners(
childContent, NS_EVENT_BITS_MUTATION_NODEINSERTED, aParent)) {
InternalMutationEvent mutation(true, eLegacyNodeInserted);
mutation.mRelatedNode = aParent;
mozAutoSubtreeModified subtree(aDoc, aParent);
(new AsyncEventDispatcher(childContent, mutation))->RunDOMEventWhenSafe();
}
}
}
//----------------------------------------------------------------------
// nsISupports implementation
#define SUBTREE_UNBINDINGS_PER_RUNNABLE 500
class ContentUnbinder : public Runnable {
public:
ContentUnbinder() : Runnable("ContentUnbinder") { mLast = this; }
~ContentUnbinder() { Run(); }
void UnbindSubtree(nsIContent* aNode) {
if (aNode->NodeType() != nsINode::ELEMENT_NODE &&
aNode->NodeType() != nsINode::DOCUMENT_FRAGMENT_NODE) {
return;
}
FragmentOrElement* container = static_cast<FragmentOrElement*>(aNode);
if (container->HasChildren()) {
// Invalidate cached array of child nodes
container->InvalidateChildNodes();
while (container->HasChildren()) {
// Hold a strong ref to the node when we remove it, because we may be
// the last reference to it. We need to call DisconnectChild()
// before calling UnbindFromTree, since this last can notify various
// observers and they should really see consistent
// tree state.
// If this code changes, change the corresponding code in
// FragmentOrElement's and Document's unlink impls.
nsCOMPtr<nsIContent> child = container->GetLastChild();
container->DisconnectChild(child);
UnbindSubtree(child);
child->UnbindFromTree();
}
}
}
NS_IMETHOD Run() override {
nsAutoScriptBlocker scriptBlocker;
uint32_t len = mSubtreeRoots.Length();
if (len) {
for (uint32_t i = 0; i < len; ++i) {
UnbindSubtree(mSubtreeRoots[i]);
}
mSubtreeRoots.Clear();
}
nsCycleCollector_dispatchDeferredDeletion();
if (this == sContentUnbinder) {
sContentUnbinder = nullptr;
if (mNext) {
RefPtr<ContentUnbinder> next;
next.swap(mNext);
sContentUnbinder = next;
next->mLast = mLast;
mLast = nullptr;
NS_DispatchToCurrentThreadQueue(next.forget(),
EventQueuePriority::Idle);
}
}
return NS_OK;
}
static void UnbindAll() {
RefPtr<ContentUnbinder> ub = sContentUnbinder;
sContentUnbinder = nullptr;
while (ub) {
ub->Run();
ub = ub->mNext;
}
}
static void Append(nsIContent* aSubtreeRoot) {
if (!sContentUnbinder) {
sContentUnbinder = new ContentUnbinder();
nsCOMPtr<nsIRunnable> e = sContentUnbinder;
NS_DispatchToCurrentThreadQueue(e.forget(), EventQueuePriority::Idle);
}
if (sContentUnbinder->mLast->mSubtreeRoots.Length() >=
SUBTREE_UNBINDINGS_PER_RUNNABLE) {
sContentUnbinder->mLast->mNext = new ContentUnbinder();
sContentUnbinder->mLast = sContentUnbinder->mLast->mNext;
}
sContentUnbinder->mLast->mSubtreeRoots.AppendElement(aSubtreeRoot);
}
private:
AutoTArray<nsCOMPtr<nsIContent>, SUBTREE_UNBINDINGS_PER_RUNNABLE>
mSubtreeRoots;
RefPtr<ContentUnbinder> mNext;
ContentUnbinder* mLast;
static ContentUnbinder* sContentUnbinder;
};
ContentUnbinder* ContentUnbinder::sContentUnbinder = nullptr;
void FragmentOrElement::ClearContentUnbinder() { ContentUnbinder::UnbindAll(); }
NS_IMPL_CYCLE_COLLECTION_CLASS(FragmentOrElement)
// We purposefully don't UNLINK_BEGIN_INHERITED here.
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(FragmentOrElement)
nsIContent::Unlink(tmp);
// The XBL binding is removed by RemoveFromBindingManagerRunnable
// which is dispatched in UnbindFromTree.
if (tmp->HasProperties()) {
if (tmp->IsElement()) {
Element* elem = tmp->AsElement();
elem->UnlinkIntersectionObservers();
}
if (tmp->IsHTMLElement() || tmp->IsSVGElement()) {
nsStaticAtom* const* props =
Element::HTMLSVGPropertiesToTraverseAndUnlink();
for (uint32_t i = 0; props[i]; ++i) {
tmp->RemoveProperty(props[i]);
}
}
if (tmp->MayHaveAnimations()) {
nsAtom** effectProps = EffectSet::GetEffectSetPropertyAtoms();
for (uint32_t i = 0; effectProps[i]; ++i) {
tmp->RemoveProperty(effectProps[i]);
}
}
}
// Unlink child content (and unbind our subtree).
if (tmp->UnoptimizableCCNode() || !nsCCUncollectableMarker::sGeneration) {
// Don't allow script to run while we're unbinding everything.
nsAutoScriptBlocker scriptBlocker;
while (tmp->HasChildren()) {
// Hold a strong ref to the node when we remove it, because we may be
// the last reference to it.
// If this code changes, change the corresponding code in Document's
// unlink impl and ContentUnbinder::UnbindSubtree.
nsCOMPtr<nsIContent> child = tmp->GetLastChild();
tmp->DisconnectChild(child);
child->UnbindFromTree();
}
} else if (!tmp->GetParent() && tmp->HasChildren()) {
ContentUnbinder::Append(tmp);
} /* else {
The subtree root will end up to a ContentUnbinder, and that will
unbind the child nodes.
} */
if (ShadowRoot* shadowRoot = tmp->GetShadowRoot()) {
shadowRoot->Unbind();
tmp->ExtendedDOMSlots()->mShadowRoot = nullptr;
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(FragmentOrElement)
void FragmentOrElement::MarkNodeChildren(nsINode* aNode) {
JSObject* o = GetJSObjectChild(aNode);
if (o) {
JS::ExposeObjectToActiveJS(o);
}
EventListenerManager* elm = aNode->GetExistingListenerManager();
if (elm) {
elm->MarkForCC();
}
}
nsINode* FindOptimizableSubtreeRoot(nsINode* aNode) {
nsINode* p;
while ((p = aNode->GetParentNode())) {
if (aNode->UnoptimizableCCNode()) {
return nullptr;
}
aNode = p;
}
if (aNode->UnoptimizableCCNode()) {
return nullptr;
}
return aNode;
}
StaticAutoPtr<nsTHashSet<nsINode*>> gCCBlackMarkedNodes;
static void ClearBlackMarkedNodes() {
if (!gCCBlackMarkedNodes) {
return;
}
for (nsINode* n : *gCCBlackMarkedNodes) {
n->SetCCMarkedRoot(false);
n->SetInCCBlackTree(false);
}
gCCBlackMarkedNodes = nullptr;
}
// static
void FragmentOrElement::RemoveBlackMarkedNode(nsINode* aNode) {
if (!gCCBlackMarkedNodes) {
return;
}
gCCBlackMarkedNodes->Remove(aNode);
}
static bool IsCertainlyAliveNode(nsINode* aNode, Document* aDoc) {
MOZ_ASSERT(aNode->GetComposedDoc() == aDoc);
// Marked to be in-CC-generation or if the document is an svg image that's
// being kept alive by the image cache. (Note that an svg image's internal
// SVG document will receive an OnPageHide() call when it gets purged from
// the image cache; hence, we use IsVisible() as a hint that the document is
// actively being kept alive by the cache.)
return nsCCUncollectableMarker::InGeneration(aDoc->GetMarkedCCGeneration()) ||
(nsCCUncollectableMarker::sGeneration && aDoc->IsBeingUsedAsImage() &&
aDoc->IsVisible());
}
// static
bool FragmentOrElement::CanSkipInCC(nsINode* aNode) {
// Don't try to optimize anything during shutdown.
if (nsCCUncollectableMarker::sGeneration == 0) {
return false;
}
Document* currentDoc = aNode->GetComposedDoc();
if (currentDoc && IsCertainlyAliveNode(aNode, currentDoc)) {
return !NeedsScriptTraverse(aNode);
}
// Bail out early if aNode is somewhere in anonymous content,
// or otherwise unusual.
if (aNode->UnoptimizableCCNode()) {
return false;
}
nsINode* root = currentDoc ? static_cast<nsINode*>(currentDoc)
: FindOptimizableSubtreeRoot(aNode);
if (!root) {
return false;
}
// Subtree has been traversed already.
if (root->CCMarkedRoot()) {
return root->InCCBlackTree() && !NeedsScriptTraverse(aNode);
}
if (!gCCBlackMarkedNodes) {
gCCBlackMarkedNodes = new nsTHashSet<nsINode*>(1020);
}
// nodesToUnpurple contains nodes which will be removed
// from the purple buffer if the DOM tree is known-live.
AutoTArray<nsIContent*, 1020> nodesToUnpurple;
// grayNodes need script traverse, so they aren't removed from
// the purple buffer, but are marked to be in known-live subtree so that
// traverse is faster.
AutoTArray<nsINode*, 1020> grayNodes;
bool foundLiveWrapper = root->HasKnownLiveWrapper();
if (root != currentDoc) {
currentDoc = nullptr;
if (NeedsScriptTraverse(root)) {
grayNodes.AppendElement(root);
} else if (static_cast<nsIContent*>(root)->IsPurple()) {
nodesToUnpurple.AppendElement(static_cast<nsIContent*>(root));
}
}
// Traverse the subtree and check if we could know without CC
// that it is known-live.
// Note, this traverse is non-virtual and inline, so it should be a lot faster
// than CC's generic traverse.
for (nsIContent* node = root->GetFirstChild(); node;
node = node->GetNextNode(root)) {
foundLiveWrapper = foundLiveWrapper || node->HasKnownLiveWrapper();
if (foundLiveWrapper && currentDoc) {
// If we can mark the whole document known-live, no need to optimize
// so much, since when the next purple node in the document will be
// handled, it is fast to check that currentDoc is in CCGeneration.
break;
}
if (NeedsScriptTraverse(node)) {
// Gray nodes need real CC traverse.
grayNodes.AppendElement(node);
} else if (node->IsPurple()) {
nodesToUnpurple.AppendElement(node);
}
}
root->SetCCMarkedRoot(true);
root->SetInCCBlackTree(foundLiveWrapper);
gCCBlackMarkedNodes->Insert(root);
if (!foundLiveWrapper) {
return false;
}
if (currentDoc) {
// Special case documents. If we know the document is known-live,
// we can mark the document to be in CCGeneration.
currentDoc->MarkUncollectableForCCGeneration(
nsCCUncollectableMarker::sGeneration);
} else {
for (uint32_t i = 0; i < grayNodes.Length(); ++i) {
nsINode* node = grayNodes[i];
node->SetInCCBlackTree(true);
gCCBlackMarkedNodes->Insert(node);
}
}
// Subtree is known-live, we can remove non-gray purple nodes from
// purple buffer.
for (uint32_t i = 0; i < nodesToUnpurple.Length(); ++i) {
nsIContent* purple = nodesToUnpurple[i];
// Can't remove currently handled purple node.
if (purple != aNode) {
purple->RemovePurple();
}
}
return !NeedsScriptTraverse(aNode);
}
AutoTArray<nsINode*, 1020>* gPurpleRoots = nullptr;
AutoTArray<nsIContent*, 1020>* gNodesToUnbind = nullptr;
void ClearCycleCollectorCleanupData() {
if (gPurpleRoots) {
uint32_t len = gPurpleRoots->Length();
for (uint32_t i = 0; i < len; ++i) {
nsINode* n = gPurpleRoots->ElementAt(i);
n->SetIsPurpleRoot(false);
}
delete gPurpleRoots;
gPurpleRoots = nullptr;
}
if (gNodesToUnbind) {
uint32_t len = gNodesToUnbind->Length();
for (uint32_t i = 0; i < len; ++i) {
nsIContent* c = gNodesToUnbind->ElementAt(i);
c->SetIsPurpleRoot(false);
ContentUnbinder::Append(c);
}
delete gNodesToUnbind;
gNodesToUnbind = nullptr;
}
}
static bool ShouldClearPurple(nsIContent* aContent) {
MOZ_ASSERT(aContent);
if (aContent->IsPurple()) {
return true;
}
JSObject* o = GetJSObjectChild(aContent);
if (o && JS::ObjectIsMarkedGray(o)) {
return true;
}
if (aContent->HasListenerManager()) {
return true;
}
return aContent->HasProperties();
}
// If aNode is not optimizable, but is an element
// with a frame in a document which has currently active presshell,
// we can act as if it was optimizable. When the primary frame dies, aNode
// will end up to the purple buffer because of the refcount change.
bool NodeHasActiveFrame(Document* aCurrentDoc, nsINode* aNode) {
return aCurrentDoc->GetPresShell() && aNode->IsElement() &&
aNode->AsElement()->GetPrimaryFrame();
}
// CanSkip checks if aNode is known-live, and if it is, returns true. If aNode
// is in a known-live DOM tree, CanSkip may also remove other objects from
// purple buffer and unmark event listeners and user data. If the root of the
// DOM tree is a document, less optimizations are done since checking the
// liveness of the current document is usually fast and we don't want slow down
// such common cases.
bool FragmentOrElement::CanSkip(nsINode* aNode, bool aRemovingAllowed) {
// Don't try to optimize anything during shutdown.
if (nsCCUncollectableMarker::sGeneration == 0) {
return false;
}
bool unoptimizable = aNode->UnoptimizableCCNode();
Document* currentDoc = aNode->GetComposedDoc();
if (currentDoc && IsCertainlyAliveNode(aNode, currentDoc) &&
(!unoptimizable || NodeHasActiveFrame(currentDoc, aNode))) {
MarkNodeChildren(aNode);
return true;
}
if (unoptimizable) {
return false;
}
nsINode* root = currentDoc ? static_cast<nsINode*>(currentDoc)
: FindOptimizableSubtreeRoot(aNode);
if (!root) {
return false;
}