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b7addff074
gecko/dom/base/FragmentOrElement.cpp
Olli Pettay f39dbd97b9 Bug 1037687, load iframes in shadow DOM, r=wchen
2015-02-24 16:41:43 +02:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=79: */
/* 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; this provides an implementation
* of DOM Core's nsIDOMElement, implements nsIContent, provides
* utility methods for subclasses, and so forth.
*/
#include "mozilla/ArrayUtils.h"
#include "mozilla/Likely.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/dom/FragmentOrElement.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/dom/Attr.h"
#include "nsDOMAttributeMap.h"
#include "nsIAtom.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/dom/Event.h"
#include "nsIDocumentInlines.h"
#include "nsIDocumentEncoder.h"
#include "nsIDOMNodeList.h"
#include "nsIContentIterator.h"
#include "nsFocusManager.h"
#include "nsILinkHandler.h"
#include "nsIScriptGlobalObject.h"
#include "nsIURL.h"
#include "nsNetUtil.h"
#include "nsIFrame.h"
#include "nsIAnonymousContentCreator.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsStyleConsts.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsIDOMEvent.h"
#include "nsDOMCID.h"
#include "nsIServiceManager.h"
#include "nsIDOMCSSStyleDeclaration.h"
#include "nsDOMCSSAttrDeclaration.h"
#include "nsNameSpaceManager.h"
#include "nsContentList.h"
#include "nsDOMTokenList.h"
#include "nsXBLPrototypeBinding.h"
#include "nsError.h"
#include "nsDOMString.h"
#include "nsIScriptSecurityManager.h"
#include "nsIDOMMutationEvent.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/MouseEvents.h"
#include "nsNodeUtils.h"
#include "nsDocument.h"
#include "nsAttrValueOrString.h"
#ifdef MOZ_XUL
#include "nsXULElement.h"
#endif /* MOZ_XUL */
#include "nsFrameSelection.h"
#ifdef DEBUG
#include "nsRange.h"
#endif
#include "nsBindingManager.h"
#include "nsXBLBinding.h"
#include "nsPIDOMWindow.h"
#include "nsPIBoxObject.h"
#include "nsSVGUtils.h"
#include "nsLayoutUtils.h"
#include "nsGkAtoms.h"
#include "nsContentUtils.h"
#include "nsTextFragment.h"
#include "nsContentCID.h"
#include "nsIDOMEventListener.h"
#include "nsIWebNavigation.h"
#include "nsIBaseWindow.h"
#include "nsIWidget.h"
#include "js/GCAPI.h"
#include "nsNodeInfoManager.h"
#include "nsICategoryManager.h"
#include "nsGenericHTMLElement.h"
#include "nsIEditor.h"
#include "nsIEditorIMESupport.h"
#include "nsContentCreatorFunctions.h"
#include "nsIControllers.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsIScrollableFrame.h"
#include "ChildIterator.h"
#include "mozilla/css/StyleRule.h" /* For nsCSSSelectorList */
#include "nsRuleProcessorData.h"
#include "nsTextNode.h"
#include "mozilla/dom/NodeListBinding.h"
#include "mozilla/dom/UndoManager.h"
#ifdef MOZ_XUL
#include "nsIXULDocument.h"
#endif /* MOZ_XUL */
#include "nsCCUncollectableMarker.h"
#include "mozAutoDocUpdate.h"
#include "prprf.h"
#include "nsDOMMutationObserver.h"
#include "nsWrapperCacheInlines.h"
#include "nsCycleCollector.h"
#include "xpcpublic.h"
#include "nsIScriptError.h"
#include "mozilla/Telemetry.h"
#include "mozilla/CORSMode.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/HTMLTemplateElement.h"
#include "nsStyledElement.h"
#include "nsIContentInlines.h"
using namespace mozilla;
using namespace mozilla::dom;
int32_t nsIContent::sTabFocusModel = eTabFocus_any;
bool nsIContent::sTabFocusModelAppliesToXUL = false;
uint64_t nsMutationGuard::sGeneration = 0;
nsIContent*
nsIContent::FindFirstNonChromeOnlyAccessContent() const
{
// This handles also nested native anonymous content.
for (const nsIContent *content = this; content;
content = content->GetBindingParent()) {
if (!content->ChromeOnlyAccess()) {
// Oops, this function signature allows casting const to
// non-const. (Then again, so does GetChildAt(0)->GetParent().)
return const_cast<nsIContent*>(content);
}
}
return nullptr;
}
nsIContent*
nsIContent::GetFlattenedTreeParent() const
{
nsIContent* parent = GetParent();
if (parent && nsContentUtils::HasDistributedChildren(parent) &&
nsContentUtils::IsInSameAnonymousTree(parent, this)) {
// This node is distributed to insertion points, thus we
// need to consult the destination insertion points list to
// figure out where this node was inserted in the flattened tree.
// It may be the case that |parent| distributes its children
// but the child does not match any insertion points, thus
// the flattened tree parent is nullptr.
nsTArray<nsIContent*>* destInsertionPoints = GetExistingDestInsertionPoints();
parent = destInsertionPoints && !destInsertionPoints->IsEmpty() ?
destInsertionPoints->LastElement()->GetParent() : nullptr;
} else if (HasFlag(NODE_MAY_BE_IN_BINDING_MNGR)) {
nsIContent* insertionParent = GetXBLInsertionParent();
if (insertionParent) {
parent = insertionParent;
}
}
// Shadow roots never shows up in the flattened tree. Return the host
// instead.
if (parent && parent->IsInShadowTree()) {
ShadowRoot* parentShadowRoot = ShadowRoot::FromNode(parent);
if (parentShadowRoot) {
return parentShadowRoot->GetHost();
}
}
return parent;
}
nsIContent::IMEState
nsIContent::GetDesiredIMEState()
{
if (!IsEditableInternal()) {
// 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_MOZ_READWRITE)) {
return IMEState(IMEState::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();
}
nsIDocument* doc = GetComposedDoc();
if (!doc) {
return IMEState(IMEState::DISABLED);
}
nsIPresShell* ps = doc->GetShell();
if (!ps) {
return IMEState(IMEState::DISABLED);
}
nsPresContext* pc = ps->GetPresContext();
if (!pc) {
return IMEState(IMEState::DISABLED);
}
nsIEditor* editor = nsContentUtils::GetHTMLEditor(pc);
nsCOMPtr<nsIEditorIMESupport> imeEditor = do_QueryInterface(editor);
if (!imeEditor) {
return IMEState(IMEState::DISABLED);
}
IMEState state;
imeEditor->GetPreferredIMEState(&state);
return state;
}
bool
nsIContent::HasIndependentSelection()
{
nsIFrame* frame = GetPrimaryFrame();
return (frame && frame->GetStateBits() & NS_FRAME_INDEPENDENT_SELECTION);
}
dom::Element*
nsIContent::GetEditingHost()
{
// If this isn't editable, return nullptr.
NS_ENSURE_TRUE(IsEditableInternal(), nullptr);
nsIDocument* doc = GetComposedDoc();
NS_ENSURE_TRUE(doc, 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;
}
nsCOMPtr<nsIAtom> name;
if (!aNamespacePrefix.IsEmpty()) {
name = do_GetAtom(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.
const nsIContent* content = this;
do {
if (content->GetAttr(kNameSpaceID_XMLNS, name, aNamespaceURI))
return NS_OK;
} while ((content = content->GetParent()));
return NS_ERROR_FAILURE;
}
already_AddRefed<nsIURI>
nsIContent::GetBaseURI(bool aTryUseXHRDocBaseURI) const
{
nsIDocument* doc = OwnerDoc();
// Start with document base
nsCOMPtr<nsIURI> base = doc->GetBaseURI(aTryUseXHRDocBaseURI);
// Collect array of xml:base attribute values up the parent chain. This
// is slightly slower for the case when there are xml:base attributes, but
// faster for the far more common case of there not being any such
// attributes.
// Also check for SVG elements which require special handling
nsAutoTArray<nsString, 5> baseAttrs;
nsString attr;
const nsIContent *elem = this;
do {
// First check for SVG specialness (why is this SVG specific?)
if (elem->IsSVG()) {
nsIContent* bindingParent = elem->GetBindingParent();
if (bindingParent) {
nsXBLBinding* binding = bindingParent->GetXBLBinding();
if (binding) {
// XXX sXBL/XBL2 issue
// If this is an anonymous XBL element use the binding
// document for the base URI.
// XXX Will fail with xml:base
base = binding->PrototypeBinding()->DocURI();
break;
}
}
}
nsIURI* explicitBaseURI = elem->GetExplicitBaseURI();
if (explicitBaseURI) {
base = explicitBaseURI;
break;
}
// Otherwise check for xml:base attribute
elem->GetAttr(kNameSpaceID_XML, nsGkAtoms::base, attr);
if (!attr.IsEmpty()) {
baseAttrs.AppendElement(attr);
}
elem = elem->GetParent();
} while(elem);
// Now resolve against all xml:base attrs
for (uint32_t i = baseAttrs.Length() - 1; i != uint32_t(-1); --i) {
nsCOMPtr<nsIURI> newBase;
nsresult rv = NS_NewURI(getter_AddRefs(newBase), baseAttrs[i],
doc->GetDocumentCharacterSet().get(), base);
// Do a security check, almost the same as nsDocument::SetBaseURL()
// Only need to do this on the final uri
if (NS_SUCCEEDED(rv) && i == 0) {
rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(NodePrincipal(), newBase,
nsIScriptSecurityManager::STANDARD);
}
if (NS_SUCCEEDED(rv)) {
base.swap(newBase);
}
}
return base.forget();
}
//----------------------------------------------------------------------
static inline JSObject*
GetJSObjectChild(nsWrapperCache* aCache)
{
return aCache->PreservingWrapper() ? aCache->GetWrapperPreserveColor() : nullptr;
}
static bool
NeedsScriptTraverse(nsINode* aNode)
{
return aNode->PreservingWrapper() && aNode->GetWrapperPreserveColor() &&
!aNode->IsBlackAndDoesNotNeedTracing(aNode);
}
//----------------------------------------------------------------------
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsChildContentList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsChildContentList)
// If nsChildContentList is changed so that any additional fields are
// traversed by the cycle collector, then CAN_SKIP must be updated to
// check that the additional fields are null.
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(nsChildContentList)
// nsChildContentList only ever has a single child, its wrapper, so if
// the wrapper is black, the list can't be part of a garbage cycle.
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsChildContentList)
return tmp->IsBlack();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsChildContentList)
return tmp->IsBlackAndDoesNotNeedTracing(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
// CanSkipThis returns false to avoid problems with incomplete unlinking.
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsChildContentList)
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
NS_INTERFACE_TABLE_HEAD(nsChildContentList)
NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
NS_INTERFACE_TABLE(nsChildContentList, nsINodeList, nsIDOMNodeList)
NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(nsChildContentList)
NS_INTERFACE_MAP_END
JSObject*
nsChildContentList::WrapObject(JSContext *cx)
{
return NodeListBinding::Wrap(cx, this);
}
NS_IMETHODIMP
nsChildContentList::GetLength(uint32_t* aLength)
{
*aLength = mNode ? mNode->GetChildCount() : 0;
return NS_OK;
}
NS_IMETHODIMP
nsChildContentList::Item(uint32_t aIndex, nsIDOMNode** aReturn)
{
nsINode* node = Item(aIndex);
if (!node) {
*aReturn = nullptr;
return NS_OK;
}
return CallQueryInterface(node, aReturn);
}
nsIContent*
nsChildContentList::Item(uint32_t aIndex)
{
if (mNode) {
return mNode->GetChildAt(aIndex);
}
return nullptr;
}
int32_t
nsChildContentList::IndexOf(nsIContent* aContent)
{
if (mNode) {
return mNode->IndexOf(aContent);
}
return -1;
}
//----------------------------------------------------------------------
nsIHTMLCollection*
FragmentOrElement::Children()
{
FragmentOrElement::nsDOMSlots *slots = DOMSlots();
if (!slots->mChildrenList) {
slots->mChildrenList = new nsContentList(this, kNameSpaceID_Wildcard,
nsGkAtoms::_asterix, nsGkAtoms::_asterix,
false);
}
return slots->mChildrenList;
}
//----------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsNodeWeakReference,
nsIWeakReference)
nsNodeWeakReference::~nsNodeWeakReference()
{
if (mNode) {
NS_ASSERTION(mNode->Slots()->mWeakReference == this,
"Weak reference has wrong value");
mNode->Slots()->mWeakReference = nullptr;
}
}
NS_IMETHODIMP
nsNodeWeakReference::QueryReferent(const nsIID& aIID, void** aInstancePtr)
{
return mNode ? mNode->QueryInterface(aIID, aInstancePtr) :
NS_ERROR_NULL_POINTER;
}
size_t
nsNodeWeakReference::SizeOfOnlyThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this);
}
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_ENSURE_TRUE(slots->mWeakReference, NS_ERROR_OUT_OF_MEMORY);
}
NS_ADDREF(*aInstancePtr = slots->mWeakReference);
return NS_OK;
}
//----------------------------------------------------------------------
FragmentOrElement::nsDOMSlots::nsDOMSlots()
: nsINode::nsSlots(),
mDataset(nullptr),
mUndoManager(nullptr),
mBindingParent(nullptr)
{
}
FragmentOrElement::nsDOMSlots::~nsDOMSlots()
{
if (mAttributeMap) {
mAttributeMap->DropReference();
}
}
void
FragmentOrElement::nsDOMSlots::Traverse(nsCycleCollectionTraversalCallback &cb, bool aIsXUL)
{
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mStyle");
cb.NoteXPCOMChild(mStyle.get());
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mSMILOverrideStyle");
cb.NoteXPCOMChild(mSMILOverrideStyle.get());
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mAttributeMap");
cb.NoteXPCOMChild(mAttributeMap.get());
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mUndoManager");
cb.NoteXPCOMChild(mUndoManager.get());
if (aIsXUL) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mControllers");
cb.NoteXPCOMChild(mControllers);
}
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mXBLBinding");
cb.NoteNativeChild(mXBLBinding, NS_CYCLE_COLLECTION_PARTICIPANT(nsXBLBinding));
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mXBLInsertionParent");
cb.NoteXPCOMChild(mXBLInsertionParent.get());
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mShadowRoot");
cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mShadowRoot));
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mContainingShadow");
cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mContainingShadow));
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mChildrenList");
cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIDOMNodeList*, mChildrenList));
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mClassList");
cb.NoteXPCOMChild(mClassList.get());
if (mCustomElementData) {
for (uint32_t i = 0; i < mCustomElementData->mCallbackQueue.Length(); i++) {
mCustomElementData->mCallbackQueue[i]->Traverse(cb);
}
}
}
void
FragmentOrElement::nsDOMSlots::Unlink(bool aIsXUL)
{
mStyle = nullptr;
mSMILOverrideStyle = nullptr;
if (mAttributeMap) {
mAttributeMap->DropReference();
mAttributeMap = nullptr;
}
if (aIsXUL)
NS_IF_RELEASE(mControllers);
mXBLBinding = nullptr;
mXBLInsertionParent = nullptr;
mShadowRoot = nullptr;
mContainingShadow = nullptr;
mChildrenList = nullptr;
mUndoManager = nullptr;
mCustomElementData = nullptr;
mClassList = nullptr;
}
size_t
FragmentOrElement::nsDOMSlots::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
if (mAttributeMap) {
n += mAttributeMap->SizeOfIncludingThis(aMallocSizeOf);
}
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - Superclass members (nsINode::nsSlots)
// - mStyle
// - mDataSet
// - mSMILOverrideStyle
// - mSMILOverrideStyleRule
// - mChildrenList
// - mClassList
// The following members are not measured:
// - mBindingParent / mControllers: because they're non-owning
return n;
}
FragmentOrElement::FragmentOrElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: nsIContent(aNodeInfo)
{
}
FragmentOrElement::FragmentOrElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsIContent(aNodeInfo)
{
}
FragmentOrElement::~FragmentOrElement()
{
NS_PRECONDITION(!IsInDoc(),
"Please remove this from the document properly");
if (GetParent()) {
NS_RELEASE(mParent);
}
}
already_AddRefed<nsINodeList>
FragmentOrElement::GetChildren(uint32_t aFilter)
{
nsRefPtr<nsSimpleContentList> list = new nsSimpleContentList(this);
AllChildrenIterator iter(this, aFilter);
while (nsIContent* kid = iter.GetNextChild()) {
list->AppendElement(kid);
}
return list.forget();
}
static nsIContent*
FindChromeAccessOnlySubtreeOwner(nsIContent* aContent)
{
if (aContent->ChromeOnlyAccess()) {
bool chromeAccessOnly = false;
while (aContent && !chromeAccessOnly) {
chromeAccessOnly = aContent->IsRootOfChromeAccessOnlySubtree();
aContent = aContent->GetParent();
}
}
return aContent;
}
nsresult
nsIContent::PreHandleEvent(EventChainPreVisitor& aVisitor)
{
//FIXME! Document how this event retargeting works, Bug 329124.
aVisitor.mCanHandle = true;
aVisitor.mMayHaveListenerManager = HasListenerManager();
// Don't propagate mouseover and mouseout events when mouse is moving
// inside chrome access only content.
bool isAnonForEvents = IsRootOfChromeAccessOnlySubtree();
if ((aVisitor.mEvent->message == NS_MOUSE_ENTER_SYNTH ||
aVisitor.mEvent->message == NS_MOUSE_EXIT_SYNTH ||
aVisitor.mEvent->message == NS_POINTER_OVER ||
aVisitor.mEvent->message == NS_POINTER_OUT) &&
// 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->originalTarget &&
!ChromeOnlyAccess()) || isAnonForEvents || GetShadowRoot())) {
nsCOMPtr<nsIContent> relatedTarget =
do_QueryInterface(aVisitor.mEvent->AsMouseEvent()->relatedTarget);
if (relatedTarget &&
relatedTarget->OwnerDoc() == OwnerDoc()) {
// In the web components case, we may need to stop propagation of events
// at shadow root host.
if (GetShadowRoot()) {
nsIContent* adjustedTarget =
Event::GetShadowRelatedTarget(this, relatedTarget);
if (this == adjustedTarget) {
aVisitor.mParentTarget = nullptr;
aVisitor.mCanHandle = false;
return NS_OK;
}
}
// 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->originalTarget == this &&
(aVisitor.mRelatedTargetIsInAnon =
relatedTarget->ChromeOnlyAccess()))) {
nsIContent* anonOwner = FindChromeAccessOnlySubtreeOwner(this);
if (anonOwner) {
nsIContent* 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->originalTarget);
nsAutoString ot, ct, rt;
if (originalTarget) {
originalTarget->Tag()->ToString(ot);
}
Tag()->ToString(ct);
relatedTarget->Tag()->ToString(rt);
printf("Stopping %s propagation:"
"\n\toriginalTarget=%s \n\tcurrentTarget=%s %s"
"\n\trelatedTarget=%s %s \n%s",
(aVisitor.mEvent->message == NS_MOUSE_ENTER_SYNTH)
? "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.mParentTarget = nullptr;
// Event should not propagate to non-anon content.
aVisitor.mCanHandle = isAnonForEvents;
return NS_OK;
}
}
}
}
}
}
nsIContent* parent = GetParent();
// Web components have a special event chain that need to account
// for destination insertion points where nodes have been distributed.
nsTArray<nsIContent*>* destPoints = GetExistingDestInsertionPoints();
if (destPoints && !destPoints->IsEmpty()) {
// Push destination insertion points to aVisitor.mDestInsertionPoints
// excluding shadow insertion points.
bool didPushNonShadowInsertionPoint = false;
for (uint32_t i = 0; i < destPoints->Length(); i++) {
nsIContent* point = destPoints->ElementAt(i);
if (!ShadowRoot::IsShadowInsertionPoint(point)) {
aVisitor.mDestInsertionPoints.AppendElement(point);
didPushNonShadowInsertionPoint = true;
}
}
// Next node in the event path is the final destination
// (non-shadow) insertion point that was pushed.
if (didPushNonShadowInsertionPoint) {
parent = aVisitor.mDestInsertionPoints.LastElement();
aVisitor.mDestInsertionPoints.SetLength(
aVisitor.mDestInsertionPoints.Length() - 1);
}
}
ShadowRoot* thisShadowRoot = ShadowRoot::FromNode(this);
if (thisShadowRoot) {
// The following events must always be stopped at the root node of the node tree:
// abort
// error
// select
// change
// load
// reset
// resize
// scroll
// selectstart
bool stopEvent = false;
switch (aVisitor.mEvent->message) {
case NS_IMAGE_ABORT:
case NS_LOAD_ERROR:
case NS_FORM_SELECTED:
case NS_FORM_CHANGE:
case NS_LOAD:
case NS_FORM_RESET:
case NS_RESIZE_EVENT:
case NS_SCROLL_EVENT:
stopEvent = true;
break;
case NS_USER_DEFINED_EVENT:
if (aVisitor.mDOMEvent) {
nsAutoString eventType;
aVisitor.mDOMEvent->GetType(eventType);
if (eventType.EqualsLiteral("abort") ||
eventType.EqualsLiteral("error") ||
eventType.EqualsLiteral("select") ||
eventType.EqualsLiteral("change") ||
eventType.EqualsLiteral("load") ||
eventType.EqualsLiteral("reset") ||
eventType.EqualsLiteral("resize") ||
eventType.EqualsLiteral("scroll") ||
eventType.EqualsLiteral("selectstart")) {
stopEvent = true;
}
}
break;
}
if (stopEvent) {
// If we do stop propagation, we still want to propagate
// the event to chrome (nsPIDOMWindow::GetParentTarget()).
// The load event is special in that we don't ever propagate it
// to chrome.
nsCOMPtr<nsPIDOMWindow> win = OwnerDoc()->GetWindow();
EventTarget* parentTarget = win && aVisitor.mEvent->message != NS_LOAD
? win->GetParentTarget() : nullptr;
aVisitor.mParentTarget = parentTarget;
return NS_OK;
}
if (!aVisitor.mDestInsertionPoints.IsEmpty()) {
parent = aVisitor.mDestInsertionPoints.LastElement();
aVisitor.mDestInsertionPoints.SetLength(
aVisitor.mDestInsertionPoints.Length() - 1);
} else {
// The pool host for the youngest shadow root is shadow DOM host,
// for older shadow roots, it is the shadow insertion point
// where the shadow root is projected, nullptr if none exists.
parent = thisShadowRoot->GetPoolHost();
}
}
// 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->originalTarget);
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->target));
if (content && content->GetBindingParent() == parent) {
aVisitor.mEventTargetAtParent = parent;
}
}
// check for an anonymous parent
// XXX XBL2/sXBL issue
if (HasFlag(NODE_MAY_BE_IN_BINDING_MNGR)) {
nsIContent* insertionParent = GetXBLInsertionParent();
NS_ASSERTION(!(aVisitor.mEventTargetAtParent && insertionParent &&
aVisitor.mEventTargetAtParent != insertionParent),
"Retargeting and having insertion parent!");
if (insertionParent) {
parent = insertionParent;
}
}
if (parent) {
aVisitor.mParentTarget = parent;
} else {
aVisitor.mParentTarget = GetComposedDoc();
}
return NS_OK;
}
bool
nsIContent::GetAttr(int32_t aNameSpaceID, nsIAtom* aName,
nsAString& aResult) const
{
if (IsElement()) {
return AsElement()->GetAttr(aNameSpaceID, aName, aResult);
}
aResult.Truncate();
return false;
}
bool
nsIContent::HasAttr(int32_t aNameSpaceID, nsIAtom* aName) const
{
return IsElement() && AsElement()->HasAttr(aNameSpaceID, aName);
}
bool
nsIContent::AttrValueIs(int32_t aNameSpaceID,
nsIAtom* aName,
const nsAString& aValue,
nsCaseTreatment aCaseSensitive) const
{
return IsElement() &&
AsElement()->AttrValueIs(aNameSpaceID, aName, aValue, aCaseSensitive);
}
bool
nsIContent::AttrValueIs(int32_t aNameSpaceID,
nsIAtom* aName,
nsIAtom* aValue,
nsCaseTreatment aCaseSensitive) const
{
return IsElement() &&
AsElement()->AttrValueIs(aNameSpaceID, aName, aValue, aCaseSensitive);
}
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)) {
if (nsContentUtils::IsUserFocusIgnored(this)) {
if (aTabIndex) {
*aTabIndex = -1;
}
return false;
}
return focusable;
}
return false;
}
bool
nsIContent::IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse)
{
if (aTabIndex) {
*aTabIndex = -1; // Default, not tabbable
}
return false;
}
NS_IMETHODIMP
FragmentOrElement::WalkContentStyleRules(nsRuleWalker* aRuleWalker)
{
return NS_OK;
}
bool
FragmentOrElement::IsLink(nsIURI** aURI) const
{
*aURI = nullptr;
return false;
}
nsIContent*
FragmentOrElement::GetBindingParent() const
{
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
return slots->mBindingParent;
}
return nullptr;
}
nsXBLBinding*
FragmentOrElement::GetXBLBinding() const
{
if (HasFlag(NODE_MAY_BE_IN_BINDING_MNGR)) {
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
return slots->mXBLBinding;
}
}
return nullptr;
}
void
FragmentOrElement::SetXBLBinding(nsXBLBinding* aBinding,
nsBindingManager* aOldBindingManager)
{
nsBindingManager* bindingManager;
if (aOldBindingManager) {
MOZ_ASSERT(!aBinding, "aOldBindingManager should only be provided "
"when removing a binding.");
bindingManager = aOldBindingManager;
} else {
bindingManager = OwnerDoc()->BindingManager();
}
// After this point, aBinding will be the most-derived binding for aContent.
// If we already have a binding for aContent, make sure to
// remove it from the attached stack. Otherwise we might end up firing its
// constructor twice (if aBinding inherits from it) or firing its constructor
// after aContent has been deleted (if aBinding is null and the content node
// dies before we process mAttachedStack).
nsRefPtr<nsXBLBinding> oldBinding = GetXBLBinding();
if (oldBinding) {
bindingManager->RemoveFromAttachedQueue(oldBinding);
}
if (aBinding) {
SetFlags(NODE_MAY_BE_IN_BINDING_MNGR);
nsDOMSlots *slots = DOMSlots();
slots->mXBLBinding = aBinding;
bindingManager->AddBoundContent(this);
} else {
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
slots->mXBLBinding = nullptr;
}
bindingManager->RemoveBoundContent(this);
if (oldBinding) {
oldBinding->SetBoundElement(nullptr);
}
}
}
nsIContent*
FragmentOrElement::GetXBLInsertionParent() const
{
if (HasFlag(NODE_MAY_BE_IN_BINDING_MNGR)) {
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
return slots->mXBLInsertionParent;
}
}
return nullptr;
}
ShadowRoot*
FragmentOrElement::GetShadowRoot() const
{
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
return slots->mShadowRoot;
}
return nullptr;
}
ShadowRoot*
FragmentOrElement::GetContainingShadow() const
{
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
return slots->mContainingShadow;
}
return nullptr;
}
void
FragmentOrElement::SetShadowRoot(ShadowRoot* aShadowRoot)
{
nsDOMSlots *slots = DOMSlots();
slots->mShadowRoot = aShadowRoot;
}
nsTArray<nsIContent*>&
FragmentOrElement::DestInsertionPoints()
{
nsDOMSlots *slots = DOMSlots();
return slots->mDestInsertionPoints;
}
nsTArray<nsIContent*>*
FragmentOrElement::GetExistingDestInsertionPoints() const
{
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
return &slots->mDestInsertionPoints;
}
return nullptr;
}
void
FragmentOrElement::SetXBLInsertionParent(nsIContent* aContent)
{
if (aContent) {
nsDOMSlots *slots = DOMSlots();
SetFlags(NODE_MAY_BE_IN_BINDING_MNGR);
slots->mXBLInsertionParent = aContent;
} else {
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
slots->mXBLInsertionParent = nullptr;
}
}
}
CustomElementData*
FragmentOrElement::GetCustomElementData() const
{
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
return slots->mCustomElementData;
}
return nullptr;
}
void
FragmentOrElement::SetCustomElementData(CustomElementData* aData)
{
nsDOMSlots *slots = DOMSlots();
MOZ_ASSERT(!slots->mCustomElementData, "Custom element data may not be changed once set.");
slots->mCustomElementData = aData;
}
nsresult
FragmentOrElement::InsertChildAt(nsIContent* aKid,
uint32_t aIndex,
bool aNotify)
{
NS_PRECONDITION(aKid, "null ptr");
return doInsertChildAt(aKid, aIndex, aNotify, mAttrsAndChildren);
}
void
FragmentOrElement::RemoveChildAt(uint32_t aIndex, bool aNotify)
{
nsCOMPtr<nsIContent> oldKid = mAttrsAndChildren.GetSafeChildAt(aIndex);
NS_ASSERTION(oldKid == GetChildAt(aIndex), "Unexpected child in RemoveChildAt");
if (oldKid) {
doRemoveChildAt(aIndex, aNotify, oldKid, mAttrsAndChildren);
}
}
void
FragmentOrElement::GetTextContentInternal(nsAString& aTextContent,
ErrorResult& aError)
{
if(!nsContentUtils::GetNodeTextContent(this, true, aTextContent)) {
aError.Throw(NS_ERROR_OUT_OF_MEMORY);
}
}
void
FragmentOrElement::SetTextContentInternal(const nsAString& aTextContent,
ErrorResult& aError)
{
aError = nsContentUtils::SetNodeTextContent(this, aTextContent, false);
}
void
FragmentOrElement::DestroyContent()
{
nsIDocument *document = OwnerDoc();
document->BindingManager()->RemovedFromDocument(this, document);
document->ClearBoxObjectFor(this);
// XXX We really should let cycle collection do this, but that currently still
// leaks (see https://bugzilla.mozilla.org/show_bug.cgi?id=406684).
ReleaseWrapper(this);
uint32_t i, count = mAttrsAndChildren.ChildCount();
for (i = 0; i < count; ++i) {
// The child can remove itself from the parent in BindToTree.
mAttrsAndChildren.ChildAt(i)->DestroyContent();
}
ShadowRoot* shadowRoot = GetShadowRoot();
if (shadowRoot) {
shadowRoot->DestroyContent();
}
}
void
FragmentOrElement::SaveSubtreeState()
{
uint32_t i, count = mAttrsAndChildren.ChildCount();
for (i = 0; i < count; ++i) {
mAttrsAndChildren.ChildAt(i)->SaveSubtreeState();
}
}
//----------------------------------------------------------------------
// Generic DOMNode implementations
void
FragmentOrElement::FireNodeInserted(nsIDocument* 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, NS_MUTATION_NODEINSERTED);
mutation.mRelatedNode = do_QueryInterface(aParent);
mozAutoSubtreeModified subtree(aDoc, aParent);
(new AsyncEventDispatcher(childContent, mutation))->RunDOMEventWhenSafe();
}
}
}
//----------------------------------------------------------------------
// nsISupports implementation
#define SUBTREE_UNBINDINGS_PER_RUNNABLE 500
class ContentUnbinder : public nsRunnable
{
public:
ContentUnbinder()
{
mLast = this;
}
~ContentUnbinder()
{
Run();
}
void UnbindSubtree(nsIContent* aNode)
{
if (aNode->NodeType() != nsIDOMNode::ELEMENT_NODE &&
aNode->NodeType() != nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {
return;
}
FragmentOrElement* container = static_cast<FragmentOrElement*>(aNode);
uint32_t childCount = container->mAttrsAndChildren.ChildCount();
if (childCount) {
while (childCount-- > 0) {
// Hold a strong ref to the node when we remove it, because we may be
// the last reference to it. We need to call TakeChildAt() and
// update mFirstChild before calling UnbindFromTree, since this last
// can notify various observers and they should really see consistent
// tree state.
nsCOMPtr<nsIContent> child =
container->mAttrsAndChildren.TakeChildAt(childCount);
if (childCount == 0) {
container->mFirstChild = nullptr;
}
UnbindSubtree(child);
child->UnbindFromTree();
}
}
}
NS_IMETHOD Run()
{
nsAutoScriptBlocker scriptBlocker;
uint32_t len = mSubtreeRoots.Length();
if (len) {
PRTime start = PR_Now();
for (uint32_t i = 0; i < len; ++i) {
UnbindSubtree(mSubtreeRoots[i]);
}
mSubtreeRoots.Clear();
Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_CONTENT_UNBIND,
uint32_t(PR_Now() - start) / PR_USEC_PER_MSEC);
}
nsCycleCollector_dispatchDeferredDeletion();
if (this == sContentUnbinder) {
sContentUnbinder = nullptr;
if (mNext) {
nsRefPtr<ContentUnbinder> next;
next.swap(mNext);
sContentUnbinder = next;
next->mLast = mLast;
mLast = nullptr;
NS_DispatchToMainThread(next);
}
}
return NS_OK;
}
static void UnbindAll()
{
nsRefPtr<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_DispatchToMainThread(e);
}
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:
nsAutoTArray<nsCOMPtr<nsIContent>,
SUBTREE_UNBINDINGS_PER_RUNNABLE> mSubtreeRoots;
nsRefPtr<ContentUnbinder> mNext;
ContentUnbinder* mLast;
static ContentUnbinder* sContentUnbinder;
};
ContentUnbinder* ContentUnbinder::sContentUnbinder = nullptr;
void
FragmentOrElement::ClearContentUnbinder()
{
ContentUnbinder::UnbindAll();
}
NS_IMPL_CYCLE_COLLECTION_CLASS(FragmentOrElement)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(FragmentOrElement)
nsINode::Unlink(tmp);
// The XBL binding is removed by RemoveFromBindingManagerRunnable
// which is dispatched in UnbindFromTree.
if (tmp->HasProperties()) {
if (tmp->IsHTML() || tmp->IsSVG()) {
nsIAtom*** props = Element::HTMLSVGPropertiesToTraverseAndUnlink();
for (uint32_t i = 0; props[i]; ++i) {
tmp->DeleteProperty(*props[i]);
}
}
}
// Unlink child content (and unbind our subtree).
if (tmp->UnoptimizableCCNode() || !nsCCUncollectableMarker::sGeneration) {
uint32_t childCount = tmp->mAttrsAndChildren.ChildCount();
if (childCount) {
// Don't allow script to run while we're unbinding everything.
nsAutoScriptBlocker scriptBlocker;
while (childCount-- > 0) {
// Hold a strong ref to the node when we remove it, because we may be
// the last reference to it. We need to call TakeChildAt() and
// update mFirstChild before calling UnbindFromTree, since this last
// can notify various observers and they should really see consistent
// tree state.
nsCOMPtr<nsIContent> child = tmp->mAttrsAndChildren.TakeChildAt(childCount);
if (childCount == 0) {
tmp->mFirstChild = nullptr;
}
child->UnbindFromTree();
}
}
} else if (!tmp->GetParent() && tmp->mAttrsAndChildren.ChildCount()) {
ContentUnbinder::Append(tmp);
} /* else {
The subtree root will end up to a ContentUnbinder, and that will
unbind the child nodes.
} */
// Clear flag here because unlinking slots will clear the
// containing shadow root pointer.
tmp->UnsetFlags(NODE_IS_IN_SHADOW_TREE);
// Unlink any DOM slots of interest.
{
nsDOMSlots *slots = tmp->GetExistingDOMSlots();
if (slots) {
slots->Unlink(tmp->IsXUL());
}
}
{
nsIDocument *doc;
if (!tmp->GetParentNode() && (doc = tmp->OwnerDoc())) {
doc->BindingManager()->RemovedFromDocument(tmp, doc);
}
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(FragmentOrElement)
void
FragmentOrElement::MarkUserData(void* aObject, nsIAtom* aKey, void* aChild,
void* aData)
{
uint32_t* gen = static_cast<uint32_t*>(aData);
xpc_MarkInCCGeneration(static_cast<nsISupports*>(aChild), *gen);
}
void
FragmentOrElement::MarkNodeChildren(nsINode* aNode)
{
JSObject* o = GetJSObjectChild(aNode);
if (o) {
JS::ExposeObjectToActiveJS(o);
}
EventListenerManager* elm = aNode->GetExistingListenerManager();
if (elm) {
elm->MarkForCC();
}
if (aNode->HasProperties()) {
nsIDocument* ownerDoc = aNode->OwnerDoc();
ownerDoc->PropertyTable(DOM_USER_DATA)->
Enumerate(aNode, FragmentOrElement::MarkUserData,
&nsCCUncollectableMarker::sGeneration);
}
}
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<nsTHashtable<nsPtrHashKey<nsINode>>> gCCBlackMarkedNodes;
static PLDHashOperator
VisitBlackMarkedNode(nsPtrHashKey<nsINode>* aEntry, void*)
{
nsINode* n = aEntry->GetKey();
n->SetCCMarkedRoot(false);
n->SetInCCBlackTree(false);
return PL_DHASH_NEXT;
}
static void
ClearBlackMarkedNodes()
{
if (!gCCBlackMarkedNodes) {
return;
}
gCCBlackMarkedNodes->EnumerateEntries(VisitBlackMarkedNode, nullptr);
gCCBlackMarkedNodes = nullptr;
}
// static
void
FragmentOrElement::RemoveBlackMarkedNode(nsINode* aNode)
{
if (!gCCBlackMarkedNodes) {
return;
}
gCCBlackMarkedNodes->RemoveEntry(aNode);
}
// static
bool
FragmentOrElement::CanSkipInCC(nsINode* aNode)
{
// Don't try to optimize anything during shutdown.
if (nsCCUncollectableMarker::sGeneration == 0) {
return false;
}
//XXXsmaug Need to figure out in which cases Shadow DOM can be optimized out
// from the CC graph.
nsIDocument* currentDoc = aNode->GetUncomposedDoc();
if (currentDoc &&
nsCCUncollectableMarker::InGeneration(currentDoc->GetMarkedCCGeneration())) {
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 nsTHashtable<nsPtrHashKey<nsINode> >(1020);
}
// nodesToUnpurple contains nodes which will be removed
// from the purple buffer if the DOM tree is black.
nsAutoTArray<nsIContent*, 1020> nodesToUnpurple;
// grayNodes need script traverse, so they aren't removed from
// the purple buffer, but are marked to be in black subtree so that
// traverse is faster.
nsAutoTArray<nsINode*, 1020> grayNodes;
bool foundBlack = root->IsBlack();
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 black.
// 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)) {
foundBlack = foundBlack || node->IsBlack();
if (foundBlack && currentDoc) {
// If we can mark the whole document black, 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(foundBlack);
gCCBlackMarkedNodes->PutEntry(root);
if (!foundBlack) {
return false;
}
if (currentDoc) {
// Special case documents. If we know the document is black,
// 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->PutEntry(node);
}
}
// Subtree is black, 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);
}
nsAutoTArray<nsINode*, 1020>* gPurpleRoots = nullptr;
nsAutoTArray<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)
{
if (aContent && 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(nsIDocument* aCurrentDoc, nsINode* aNode)
{
return aCurrentDoc->GetShell() && aNode->IsElement() &&
aNode->AsElement()->GetPrimaryFrame();
}
bool
OwnedByBindingManager(nsIDocument* aCurrentDoc, nsINode* aNode)
{
return aNode->IsElement() && aNode->AsElement()->GetXBLBinding();
}
// CanSkip checks if aNode is black, and if it is, returns
// true. If aNode is in a black 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 blackness 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();
nsIDocument* currentDoc = aNode->GetUncomposedDoc();
if (currentDoc &&
nsCCUncollectableMarker::InGeneration(currentDoc->GetMarkedCCGeneration()) &&
(!unoptimizable || NodeHasActiveFrame(currentDoc, aNode) ||
OwnedByBindingManager(currentDoc, aNode))) {
MarkNodeChildren(aNode);
return true;
}
if (unoptimizable) {
return false;
}
nsINode* root = currentDoc ? static_cast<nsINode*>(currentDoc) :
FindOptimizableSubtreeRoot(aNode);
if (!root) {
return false;
}
// Subtree has been traversed already, and aNode has
// been handled in a way that doesn't require revisiting it.
if (root->IsPurpleRoot()) {
return false;
}
// nodesToClear contains nodes which are either purple or
// gray.
nsAutoTArray<nsIContent*, 1020> nodesToClear;
bool foundBlack = root->IsBlack();
bool domOnlyCycle = false;
if (root != currentDoc) {
currentDoc = nullptr;
if (!foundBlack) {
domOnlyCycle = static_cast<nsIContent*>(root)->OwnedOnlyByTheDOMTree();
}
if (ShouldClearPurple(static_cast<nsIContent*>(root))) {
nodesToClear.AppendElement(static_cast<nsIContent*>(root));
}
}
// Traverse the subtree and check if we could know without CC
// that it is black.
// 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)) {
foundBlack = foundBlack || node->IsBlack();
if (foundBlack) {
domOnlyCycle = false;
if (currentDoc) {
// If we can mark the whole document black, no need to optimize
// so much, since when the next purple node in the document will be
// handled, it is fast to check that the currentDoc is in CCGeneration.
break;
}
// No need to put stuff to the nodesToClear array, if we can clear it
// already here.
if (node->IsPurple() && (node != aNode || aRemovingAllowed)) {
node->RemovePurple();
}
MarkNodeChildren(node);
} else {
domOnlyCycle = domOnlyCycle && node->OwnedOnlyByTheDOMTree();
if (ShouldClearPurple(node)) {
// Collect interesting nodes which we can clear if we find that
// they are kept alive in a black tree or are in a DOM-only cycle.
nodesToClear.AppendElement(node);
}
}
}
if (!currentDoc || !foundBlack) {
root->SetIsPurpleRoot(true);
if (domOnlyCycle) {
if (!gNodesToUnbind) {
gNodesToUnbind = new nsAutoTArray<nsIContent*, 1020>();
}
gNodesToUnbind->AppendElement(static_cast<nsIContent*>(root));
for (uint32_t i = 0; i < nodesToClear.Length(); ++i) {
nsIContent* n = nodesToClear[i];
if ((n != aNode || aRemovingAllowed) && n->IsPurple()) {
n->RemovePurple();
}
}
return true;
} else {
if (!gPurpleRoots) {
gPurpleRoots = new nsAutoTArray<nsINode*, 1020>();
}
gPurpleRoots->AppendElement(root);
}
}
if (!foundBlack) {
return false;
}
if (currentDoc) {
// Special case documents. If we know the document is black,
// we can mark the document to be in CCGeneration.
currentDoc->
MarkUncollectableForCCGeneration(nsCCUncollectableMarker::sGeneration);
MarkNodeChildren(currentDoc);
}
// Subtree is black, so we can remove purple nodes from
// purple buffer and mark stuff that to be certainly alive.
for (uint32_t i = 0; i < nodesToClear.Length(); ++i) {
nsIContent* n = nodesToClear[i];
MarkNodeChildren(n);
// Can't remove currently handled purple node,
// unless aRemovingAllowed is true.
if ((n != aNode || aRemovingAllowed) && n->IsPurple()) {
n->RemovePurple();
}
}
return true;
}
bool
FragmentOrElement::CanSkipThis(nsINode* aNode)
{
if (nsCCUncollectableMarker::sGeneration == 0) {
return false;
}
if (aNode->IsBlack()) {
return true;
}
nsIDocument* c = aNode->GetUncomposedDoc();
return
((c && nsCCUncollectableMarker::InGeneration(c->GetMarkedCCGeneration())) ||
aNode->InCCBlackTree()) && !NeedsScriptTraverse(aNode);
}
void
FragmentOrElement::InitCCCallbacks()
{
nsCycleCollector_setForgetSkippableCallback(ClearCycleCollectorCleanupData);
nsCycleCollector_setBeforeUnlinkCallback(ClearBlackMarkedNodes);
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(FragmentOrElement)
return FragmentOrElement::CanSkip(tmp, aRemovingAllowed);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(FragmentOrElement)
return FragmentOrElement::CanSkipInCC(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(FragmentOrElement)
return FragmentOrElement::CanSkipThis(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
static const char* kNSURIs[] = {
" ([none])",
" (xmlns)",
" (xml)",
" (xhtml)",
" (XLink)",
" (XSLT)",
" (XBL)",
" (MathML)",
" (RDF)",
" (XUL)",
" (SVG)",
" (XML Events)"
};
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(FragmentOrElement)
if (MOZ_UNLIKELY(cb.WantDebugInfo())) {
char name[512];
uint32_t nsid = tmp->GetNameSpaceID();
nsAtomCString localName(tmp->NodeInfo()->NameAtom());
nsAutoCString uri;
if (tmp->OwnerDoc()->GetDocumentURI()) {
tmp->OwnerDoc()->GetDocumentURI()->GetSpec(uri);
}
nsAutoString id;
nsIAtom* idAtom = tmp->GetID();
if (idAtom) {
id.AppendLiteral(" id='");
id.Append(nsDependentAtomString(idAtom));
id.Append('\'');
}
nsAutoString classes;
const nsAttrValue* classAttrValue = tmp->GetClasses();
if (classAttrValue) {
classes.AppendLiteral(" class='");
nsAutoString classString;
classAttrValue->ToString(classString);
classString.ReplaceChar(char16_t('\n'), char16_t(' '));
classes.Append(classString);
classes.Append('\'');
}
nsAutoCString orphan;
if (!tmp->IsInDoc() &&
// Ignore xbl:content, which is never in the document and hence always
// appears to be orphaned.
!tmp->NodeInfo()->Equals(nsGkAtoms::content, kNameSpaceID_XBL)) {
orphan.AppendLiteral(" (orphan)");
}
const char* nsuri = nsid < ArrayLength(kNSURIs) ? kNSURIs[nsid] : "";
PR_snprintf(name, sizeof(name), "FragmentOrElement%s %s%s%s%s %s",
nsuri,
localName.get(),
NS_ConvertUTF16toUTF8(id).get(),
NS_ConvertUTF16toUTF8(classes).get(),
orphan.get(),
uri.get());
cb.DescribeRefCountedNode(tmp->mRefCnt.get(), name);
}
else {
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(FragmentOrElement, tmp->mRefCnt.get())
}
// Always need to traverse script objects, so do that before we check
// if we're uncollectable.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
if (!nsINode::Traverse(tmp, cb)) {
return NS_SUCCESS_INTERRUPTED_TRAVERSE;
}
tmp->OwnerDoc()->BindingManager()->Traverse(tmp, cb);
if (tmp->HasProperties()) {
if (tmp->IsHTML() || tmp->IsSVG()) {
nsIAtom*** props = Element::HTMLSVGPropertiesToTraverseAndUnlink();
for (uint32_t i = 0; props[i]; ++i) {
nsISupports* property =
static_cast<nsISupports*>(tmp->GetProperty(*props[i]));
cb.NoteXPCOMChild(property);
}
}
}
// Traverse attribute names and child content.
{
uint32_t i;
uint32_t attrs = tmp->mAttrsAndChildren.AttrCount();
for (i = 0; i < attrs; i++) {
const nsAttrName* name = tmp->mAttrsAndChildren.AttrNameAt(i);
if (!name->IsAtom()) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb,
"mAttrsAndChildren[i]->NodeInfo()");
cb.NoteNativeChild(name->NodeInfo(),
NS_CYCLE_COLLECTION_PARTICIPANT(NodeInfo));
}
}
uint32_t kids = tmp->mAttrsAndChildren.ChildCount();
for (i = 0; i < kids; i++) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mAttrsAndChildren[i]");
cb.NoteXPCOMChild(tmp->mAttrsAndChildren.GetSafeChildAt(i));
}
}
// Traverse any DOM slots of interest.
{
nsDOMSlots *slots = tmp->GetExistingDOMSlots();
if (slots) {
slots->Traverse(cb, tmp->IsXUL());
}
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN(FragmentOrElement)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(FragmentOrElement)
NS_INTERFACE_MAP_ENTRY(Element)
NS_INTERFACE_MAP_ENTRY(nsIContent)
NS_INTERFACE_MAP_ENTRY(nsINode)
NS_INTERFACE_MAP_ENTRY(nsIDOMEventTarget)
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_AMBIGUOUS(nsISupports, nsIContent)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(FragmentOrElement)
NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(FragmentOrElement,
nsNodeUtils::LastRelease(this))
//----------------------------------------------------------------------
nsresult
FragmentOrElement::CopyInnerTo(FragmentOrElement* aDst)
{
uint32_t i, count = mAttrsAndChildren.AttrCount();
for (i = 0; i < count; ++i) {
const nsAttrName* name = mAttrsAndChildren.AttrNameAt(i);
const nsAttrValue* value = mAttrsAndChildren.AttrAt(i);
nsAutoString valStr;
value->ToString(valStr);
nsresult rv = aDst->SetAttr(name->NamespaceID(), name->LocalName(),
name->GetPrefix(), valStr, false);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
const nsTextFragment*
FragmentOrElement::GetText()
{
return nullptr;
}
uint32_t
FragmentOrElement::TextLength() const
{
// We can remove this assertion if it turns out to be useful to be able
// to depend on this returning 0
NS_NOTREACHED("called FragmentOrElement::TextLength");
return 0;
}
nsresult
FragmentOrElement::SetText(const char16_t* aBuffer, uint32_t aLength,
bool aNotify)
{
NS_ERROR("called FragmentOrElement::SetText");
return NS_ERROR_FAILURE;
}
nsresult
FragmentOrElement::AppendText(const char16_t* aBuffer, uint32_t aLength,
bool aNotify)
{
NS_ERROR("called FragmentOrElement::AppendText");
return NS_ERROR_FAILURE;
}
bool
FragmentOrElement::TextIsOnlyWhitespace()
{
return false;
}
bool
FragmentOrElement::HasTextForTranslation()
{
return false;
}
void
FragmentOrElement::AppendTextTo(nsAString& aResult)
{
// We can remove this assertion if it turns out to be useful to be able
// to depend on this appending nothing.
NS_NOTREACHED("called FragmentOrElement::TextLength");
}
bool
FragmentOrElement::AppendTextTo(nsAString& aResult, const mozilla::fallible_t&)
{
// We can remove this assertion if it turns out to be useful to be able
// to depend on this appending nothing.
NS_NOTREACHED("called FragmentOrElement::TextLength");
return false;
}
uint32_t
FragmentOrElement::GetChildCount() const
{
return mAttrsAndChildren.ChildCount();
}
nsIContent *
FragmentOrElement::GetChildAt(uint32_t aIndex) const
{
return mAttrsAndChildren.GetSafeChildAt(aIndex);
}
nsIContent * const *
FragmentOrElement::GetChildArray(uint32_t* aChildCount) const
{
return mAttrsAndChildren.GetChildArray(aChildCount);
}
int32_t
FragmentOrElement::IndexOf(const nsINode* aPossibleChild) const
{
return mAttrsAndChildren.IndexOfChild(aPossibleChild);
}
// Try to keep the size of StringBuilder close to a jemalloc bucket size.
#define STRING_BUFFER_UNITS 1020
namespace {
// We put StringBuilder in the anonymous namespace to prevent anything outside
// this file from accidentally being linked against it.
class StringBuilder
{
private:
class Unit
{
public:
Unit() : mAtom(nullptr), mType(eUnknown), mLength(0)
{
MOZ_COUNT_CTOR(StringBuilder::Unit);
}
~Unit()
{
if (mType == eString || mType == eStringWithEncode) {
delete mString;
}
MOZ_COUNT_DTOR(StringBuilder::Unit);
}
enum Type
{
eUnknown,
eAtom,
eString,
eStringWithEncode,
eLiteral,
eTextFragment,
eTextFragmentWithEncode,
};
union
{
nsIAtom* mAtom;
const char* mLiteral;
nsAutoString* mString;
const nsTextFragment* mTextFragment;
};
Type mType;
uint32_t mLength;
};
public:
StringBuilder() : mLast(this), mLength(0)
{
MOZ_COUNT_CTOR(StringBuilder);
}
~StringBuilder()
{
MOZ_COUNT_DTOR(StringBuilder);
}
void Append(nsIAtom* aAtom)
{
Unit* u = AddUnit();
u->mAtom = aAtom;
u->mType = Unit::eAtom;
uint32_t len = aAtom->GetLength();
u->mLength = len;
mLength += len;
}
template<int N>
void Append(const char (&aLiteral)[N])
{
Unit* u = AddUnit();
u->mLiteral = aLiteral;
u->mType = Unit::eLiteral;
uint32_t len = N - 1;
u->mLength = len;
mLength += len;
}
template<int N>
void Append(char (&aLiteral)[N])
{
Unit* u = AddUnit();
u->mLiteral = aLiteral;
u->mType = Unit::eLiteral;
uint32_t len = N - 1;
u->mLength = len;
mLength += len;
}
void Append(const nsAString& aString)
{
Unit* u = AddUnit();
u->mString = new nsAutoString(aString);
u->mType = Unit::eString;
uint32_t len = aString.Length();
u->mLength = len;
mLength += len;
}
void Append(nsAutoString* aString)
{
Unit* u = AddUnit();
u->mString = aString;
u->mType = Unit::eString;
uint32_t len = aString->Length();
u->mLength = len;
mLength += len;
}
void AppendWithAttrEncode(nsAutoString* aString, uint32_t aLen)
{
Unit* u = AddUnit();
u->mString = aString;
u->mType = Unit::eStringWithEncode;
u->mLength = aLen;
mLength += aLen;
}
void Append(const nsTextFragment* aTextFragment)
{
Unit* u = AddUnit();
u->mTextFragment = aTextFragment;
u->mType = Unit::eTextFragment;
uint32_t len = aTextFragment->GetLength();
u->mLength = len;
mLength += len;
}
void AppendWithEncode(const nsTextFragment* aTextFragment, uint32_t aLen)
{
Unit* u = AddUnit();
u->mTextFragment = aTextFragment;
u->mType = Unit::eTextFragmentWithEncode;
u->mLength = aLen;
mLength += aLen;
}
bool ToString(nsAString& aOut)
{
if (!aOut.SetCapacity(mLength, fallible)) {
return false;
}
for (StringBuilder* current = this; current; current = current->mNext) {
uint32_t len = current->mUnits.Length();
for (uint32_t i = 0; i < len; ++i) {
Unit& u = current->mUnits[i];
switch (u.mType) {
case Unit::eAtom:
aOut.Append(nsDependentAtomString(u.mAtom));
break;
case Unit::eString:
aOut.Append(*(u.mString));
break;
case Unit::eStringWithEncode:
EncodeAttrString(*(u.mString), aOut);
break;
case Unit::eLiteral:
aOut.AppendASCII(u.mLiteral, u.mLength);
break;
case Unit::eTextFragment:
u.mTextFragment->AppendTo(aOut);
break;
case Unit::eTextFragmentWithEncode:
EncodeTextFragment(u.mTextFragment, aOut);
break;
default:
MOZ_CRASH("Unknown unit type?");
}
}
}
return true;
}
private:
Unit* AddUnit()
{
if (mLast->mUnits.Length() == STRING_BUFFER_UNITS) {
new StringBuilder(this);
}
return mLast->mUnits.AppendElement();
}
explicit StringBuilder(StringBuilder* aFirst)
: mLast(nullptr), mLength(0)
{
MOZ_COUNT_CTOR(StringBuilder);
aFirst->mLast->mNext = this;
aFirst->mLast = this;
}
void EncodeAttrString(const nsAutoString& aValue, nsAString& aOut)
{
const char16_t* c = aValue.BeginReading();
const char16_t* end = aValue.EndReading();
while (c < end) {
switch (*c) {
case '"':
aOut.AppendLiteral("&quot;");
break;
case '&':
aOut.AppendLiteral("&amp;");
break;
case 0x00A0:
aOut.AppendLiteral("&nbsp;");
break;
default:
aOut.Append(*c);
break;
}
++c;
}
}
void EncodeTextFragment(const nsTextFragment* aValue, nsAString& aOut)
{
uint32_t len = aValue->GetLength();
if (aValue->Is2b()) {
const char16_t* data = aValue->Get2b();
for (uint32_t i = 0; i < len; ++i) {
const char16_t c = data[i];
switch (c) {
case '<':
aOut.AppendLiteral("&lt;");
break;
case '>':
aOut.AppendLiteral("&gt;");
break;
case '&':
aOut.AppendLiteral("&amp;");
break;
case 0x00A0:
aOut.AppendLiteral("&nbsp;");
break;
default:
aOut.Append(c);
break;
}
}
} else {
const char* data = aValue->Get1b();
for (uint32_t i = 0; i < len; ++i) {
const unsigned char c = data[i];
switch (c) {
case '<':
aOut.AppendLiteral("&lt;");
break;
case '>':
aOut.AppendLiteral("&gt;");
break;
case '&':
aOut.AppendLiteral("&amp;");
break;
case 0x00A0:
aOut.AppendLiteral("&nbsp;");
break;
default:
aOut.Append(c);
break;
}
}
}
}
nsAutoTArray<Unit, STRING_BUFFER_UNITS> mUnits;
nsAutoPtr<StringBuilder> mNext;
StringBuilder* mLast;
// mLength is used only in the first StringBuilder object in the linked list.
uint32_t mLength;
};
} // anonymous namespace
static void
AppendEncodedCharacters(const nsTextFragment* aText, StringBuilder& aBuilder)
{
uint32_t extraSpaceNeeded = 0;
uint32_t len = aText->GetLength();
if (aText->Is2b()) {
const char16_t* data = aText->Get2b();
for (uint32_t i = 0; i < len; ++i) {
const char16_t c = data[i];
switch (c) {
case '<':
extraSpaceNeeded += ArrayLength("&lt;") - 2;
break;
case '>':
extraSpaceNeeded += ArrayLength("&gt;") - 2;
break;
case '&':
extraSpaceNeeded += ArrayLength("&amp;") - 2;
break;
case 0x00A0:
extraSpaceNeeded += ArrayLength("&nbsp;") - 2;
break;
default:
break;
}
}
} else {
const char* data = aText->Get1b();
for (uint32_t i = 0; i < len; ++i) {
const unsigned char c = data[i];
switch (c) {
case '<':
extraSpaceNeeded += ArrayLength("&lt;") - 2;
break;
case '>':
extraSpaceNeeded += ArrayLength("&gt;") - 2;
break;
case '&':
extraSpaceNeeded += ArrayLength("&amp;") - 2;
break;
case 0x00A0:
extraSpaceNeeded += ArrayLength("&nbsp;") - 2;
break;
default:
break;
}
}
}
if (extraSpaceNeeded) {
aBuilder.AppendWithEncode(aText, len + extraSpaceNeeded);
} else {
aBuilder.Append(aText);
}
}
static void
AppendEncodedAttributeValue(nsAutoString* aValue, StringBuilder& aBuilder)
{
const char16_t* c = aValue->BeginReading();
const char16_t* end = aValue->EndReading();
uint32_t extraSpaceNeeded = 0;
while (c < end) {
switch (*c) {
case '"':
extraSpaceNeeded += ArrayLength("&quot;") - 2;
break;
case '&':
extraSpaceNeeded += ArrayLength("&amp;") - 2;
break;
case 0x00A0:
extraSpaceNeeded += ArrayLength("&nbsp;") - 2;
break;
default:
break;
}
++c;
}
if (extraSpaceNeeded) {
aBuilder.AppendWithAttrEncode(aValue, aValue->Length() + extraSpaceNeeded);
} else {
aBuilder.Append(aValue);
}
}
static void
StartElement(Element* aContent, StringBuilder& aBuilder)
{
nsIAtom* localName = aContent->Tag();
int32_t tagNS = aContent->GetNameSpaceID();
aBuilder.Append("<");
if (aContent->IsHTML() || aContent->IsSVG() || aContent->IsMathML()) {
aBuilder.Append(localName);
} else {
aBuilder.Append(aContent->NodeName());
}
int32_t count = aContent->GetAttrCount();
for (int32_t i = count; i > 0;) {
--i;
const nsAttrName* name = aContent->GetAttrNameAt(i);
int32_t attNs = name->NamespaceID();
nsIAtom* attName = name->LocalName();
// Filter out any attribute starting with [-|_]moz
nsDependentAtomString attrNameStr(attName);
if (StringBeginsWith(attrNameStr, NS_LITERAL_STRING("_moz")) ||
StringBeginsWith(attrNameStr, NS_LITERAL_STRING("-moz"))) {
continue;
}
nsAutoString* attValue = new nsAutoString();
aContent->GetAttr(attNs, attName, *attValue);
// Filter out special case of <br type="_moz*"> used by the editor.
// Bug 16988. Yuck.
if (localName == nsGkAtoms::br && tagNS == kNameSpaceID_XHTML &&
attName == nsGkAtoms::type && attNs == kNameSpaceID_None &&
StringBeginsWith(*attValue, NS_LITERAL_STRING("_moz"))) {
delete attValue;
continue;
}
aBuilder.Append(" ");
if (MOZ_LIKELY(attNs == kNameSpaceID_None) ||
(attNs == kNameSpaceID_XMLNS &&
attName == nsGkAtoms::xmlns)) {
// Nothing else required
} else if (attNs == kNameSpaceID_XML) {
aBuilder.Append("xml:");
} else if (attNs == kNameSpaceID_XMLNS) {
aBuilder.Append("xmlns:");
} else if (attNs == kNameSpaceID_XLink) {
aBuilder.Append("xlink:");
} else {
nsIAtom* prefix = name->GetPrefix();
if (prefix) {
aBuilder.Append(prefix);
aBuilder.Append(":");
}
}
aBuilder.Append(attName);
aBuilder.Append("=\"");
AppendEncodedAttributeValue(attValue, aBuilder);
aBuilder.Append("\"");
}
aBuilder.Append(">");
/*
// Per HTML spec we should append one \n if the first child of
// pre/textarea/listing is a textnode and starts with a \n.
// But because browsers haven't traditionally had that behavior,
// we're not changing our behavior either - yet.
if (aContent->IsHTML()) {
if (localName == nsGkAtoms::pre || localName == nsGkAtoms::textarea ||
localName == nsGkAtoms::listing) {
nsIContent* fc = aContent->GetFirstChild();
if (fc &&
(fc->NodeType() == nsIDOMNode::TEXT_NODE ||
fc->NodeType() == nsIDOMNode::CDATA_SECTION_NODE)) {
const nsTextFragment* text = fc->GetText();
if (text && text->GetLength() && text->CharAt(0) == char16_t('\n')) {
aBuilder.Append("\n");
}
}
}
}*/
}
static inline bool
ShouldEscape(nsIContent* aParent)
{
if (!aParent || !aParent->IsHTML()) {
return true;
}
static const nsIAtom* nonEscapingElements[] = {
nsGkAtoms::style, nsGkAtoms::script, nsGkAtoms::xmp,
nsGkAtoms::iframe, nsGkAtoms::noembed, nsGkAtoms::noframes,
nsGkAtoms::plaintext,
// Per the current spec noscript should be escaped in case
// scripts are disabled or if document doesn't have
// browsing context. However the latter seems to be a spec bug
// and Gecko hasn't traditionally done the former.
nsGkAtoms::noscript
};
static mozilla::BloomFilter<12, nsIAtom> sFilter;
static bool sInitialized = false;
if (!sInitialized) {
sInitialized = true;
for (uint32_t i = 0; i < ArrayLength(nonEscapingElements); ++i) {
sFilter.add(nonEscapingElements[i]);
}
}
nsIAtom* tag = aParent->Tag();
if (sFilter.mightContain(tag)) {
for (uint32_t i = 0; i < ArrayLength(nonEscapingElements); ++i) {
if (tag == nonEscapingElements[i]) {
return false;
}
}
}
return true;
}
static inline bool
IsVoidTag(nsIAtom* aTag)
{
static const nsIAtom* voidElements[] = {
nsGkAtoms::area, nsGkAtoms::base, nsGkAtoms::basefont,
nsGkAtoms::bgsound, nsGkAtoms::br, nsGkAtoms::col,
nsGkAtoms::embed, nsGkAtoms::frame,
nsGkAtoms::hr, nsGkAtoms::img, nsGkAtoms::input,
nsGkAtoms::keygen, nsGkAtoms::link, nsGkAtoms::meta,
nsGkAtoms::param, nsGkAtoms::source, nsGkAtoms::track,
nsGkAtoms::wbr
};
static mozilla::BloomFilter<12, nsIAtom> sFilter;
static bool sInitialized = false;
if (!sInitialized) {
sInitialized = true;
for (uint32_t i = 0; i < ArrayLength(voidElements); ++i) {
sFilter.add(voidElements[i]);
}
}
if (sFilter.mightContain(aTag)) {
for (uint32_t i = 0; i < ArrayLength(voidElements); ++i) {
if (aTag == voidElements[i]) {
return true;
}
}
}
return false;
}
static inline bool
IsVoidTag(Element* aElement)
{
if (!aElement->IsHTML()) {
return false;
}
return IsVoidTag(aElement->Tag());
}
/* static */
bool
FragmentOrElement::IsHTMLVoid(nsIAtom* aLocalName)
{
return aLocalName && IsVoidTag(aLocalName);
}
static bool
Serialize(FragmentOrElement* aRoot, bool aDescendentsOnly, nsAString& aOut)
{
nsINode* current = aDescendentsOnly ?
nsNodeUtils::GetFirstChildOfTemplateOrNode(aRoot) : aRoot;
if (!current) {
return true;
}
StringBuilder builder;
nsIContent* next;
while (true) {
bool isVoid = false;
switch (current->NodeType()) {
case nsIDOMNode::ELEMENT_NODE: {
Element* elem = current->AsElement();
StartElement(elem, builder);
isVoid = IsVoidTag(elem);
if (!isVoid &&
(next = nsNodeUtils::GetFirstChildOfTemplateOrNode(current))) {
current = next;
continue;
}
break;
}
case nsIDOMNode::TEXT_NODE:
case nsIDOMNode::CDATA_SECTION_NODE: {
const nsTextFragment* text = static_cast<nsIContent*>(current)->GetText();
nsIContent* parent = current->GetParent();
if (ShouldEscape(parent)) {
AppendEncodedCharacters(text, builder);
} else {
builder.Append(text);
}
break;
}
case nsIDOMNode::COMMENT_NODE: {
builder.Append("<!--");
builder.Append(static_cast<nsIContent*>(current)->GetText());
builder.Append("-->");
break;
}
case nsIDOMNode::DOCUMENT_TYPE_NODE: {
builder.Append("<!DOCTYPE ");
builder.Append(current->NodeName());
builder.Append(">");
break;
}
case nsIDOMNode::PROCESSING_INSTRUCTION_NODE: {
builder.Append("<?");
builder.Append(current->NodeName());
builder.Append(" ");
builder.Append(static_cast<nsIContent*>(current)->GetText());
builder.Append(">");
break;
}
}
while (true) {
if (!isVoid && current->NodeType() == nsIDOMNode::ELEMENT_NODE) {
builder.Append("</");
nsIContent* elem = static_cast<nsIContent*>(current);
if (elem->IsHTML() || elem->IsSVG() || elem->IsMathML()) {
builder.Append(elem->Tag());
} else {
builder.Append(current->NodeName());
}
builder.Append(">");
}
isVoid = false;
if (current == aRoot) {
return builder.ToString(aOut);
}
if ((next = current->GetNextSibling())) {
current = next;
break;
}
current = current->GetParentNode();
// Handle template element. If the parent is a template's content,
// then adjust the parent to be the template element.
if (current != aRoot &&
current->NodeType() == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {
DocumentFragment* frag = static_cast<DocumentFragment*>(current);
nsIContent* fragHost = frag->GetHost();
if (fragHost && nsNodeUtils::IsTemplateElement(fragHost)) {
current = fragHost;
}
}
if (aDescendentsOnly && current == aRoot) {
return builder.ToString(aOut);
}
}
}
}
void
FragmentOrElement::GetMarkup(bool aIncludeSelf, nsAString& aMarkup)
{
aMarkup.Truncate();
nsIDocument* doc = OwnerDoc();
if (IsInHTMLDocument()) {
Serialize(this, !aIncludeSelf, aMarkup);
return;
}
nsAutoString contentType;
doc->GetContentType(contentType);
bool tryToCacheEncoder = !aIncludeSelf;
nsCOMPtr<nsIDocumentEncoder> docEncoder = doc->GetCachedEncoder();
if (!docEncoder) {
docEncoder =
do_CreateInstance(PromiseFlatCString(
nsDependentCString(NS_DOC_ENCODER_CONTRACTID_BASE) +
NS_ConvertUTF16toUTF8(contentType)
).get());
}
if (!docEncoder) {
// This could be some type for which we create a synthetic document. Try
// again as XML
contentType.AssignLiteral("application/xml");
docEncoder = do_CreateInstance(NS_DOC_ENCODER_CONTRACTID_BASE "application/xml");
// Don't try to cache the encoder since it would point to a different
// contentType once it has been reinitialized.
tryToCacheEncoder = false;
}
NS_ENSURE_TRUE_VOID(docEncoder);
uint32_t flags = nsIDocumentEncoder::OutputEncodeBasicEntities |
// Output DOM-standard newlines
nsIDocumentEncoder::OutputLFLineBreak |
// Don't do linebreaking that's not present in
// the source
nsIDocumentEncoder::OutputRaw |
// Only check for mozdirty when necessary (bug 599983)
nsIDocumentEncoder::OutputIgnoreMozDirty;
if (IsEditable()) {
nsCOMPtr<Element> elem = do_QueryInterface(this);
nsIEditor* editor = elem ? elem->GetEditorInternal() : nullptr;
if (editor && editor->OutputsMozDirty()) {
flags &= ~nsIDocumentEncoder::OutputIgnoreMozDirty;
}
}
DebugOnly<nsresult> rv = docEncoder->NativeInit(doc, contentType, flags);
MOZ_ASSERT(NS_SUCCEEDED(rv));
if (aIncludeSelf) {
docEncoder->SetNativeNode(this);
} else {
docEncoder->SetNativeContainerNode(this);
}
rv = docEncoder->EncodeToString(aMarkup);
MOZ_ASSERT(NS_SUCCEEDED(rv));
if (tryToCacheEncoder) {
doc->SetCachedEncoder(docEncoder.forget());
}
}
static bool
ContainsMarkup(const nsAString& aStr)
{
// Note: we can't use FindCharInSet because null is one of the characters we
// want to search for.
const char16_t* start = aStr.BeginReading();
const char16_t* end = aStr.EndReading();
while (start != end) {
char16_t c = *start;
if (c == char16_t('<') ||
c == char16_t('&') ||
c == char16_t('\r') ||
c == char16_t('\0')) {
return true;
}
++start;
}
return false;
}
void
FragmentOrElement::SetInnerHTMLInternal(const nsAString& aInnerHTML, ErrorResult& aError)
{
FragmentOrElement* target = this;
// Handle template case.
if (nsNodeUtils::IsTemplateElement(target)) {
DocumentFragment* frag =
static_cast<HTMLTemplateElement*>(target)->Content();
MOZ_ASSERT(frag);
target = frag;
}
// Fast-path for strings with no markup. Limit this to short strings, to
// avoid ContainsMarkup taking too long. The choice for 100 is based on
// gut feeling.
//
// Don't do this for elements with a weird parser insertion mode, for
// instance setting innerHTML = "" on a <html> element should add the
// optional <head> and <body> elements.
if (!target->HasWeirdParserInsertionMode() &&
aInnerHTML.Length() < 100 && !ContainsMarkup(aInnerHTML)) {
aError = nsContentUtils::SetNodeTextContent(target, aInnerHTML, false);
return;
}
nsIDocument* doc = target->OwnerDoc();
// Batch possible DOMSubtreeModified events.
mozAutoSubtreeModified subtree(doc, nullptr);
target->FireNodeRemovedForChildren();
// Needed when innerHTML is used in combination with contenteditable
mozAutoDocUpdate updateBatch(doc, UPDATE_CONTENT_MODEL, true);
// Remove childnodes.
uint32_t childCount = target->GetChildCount();
nsAutoMutationBatch mb(target, true, false);
for (uint32_t i = 0; i < childCount; ++i) {
target->RemoveChildAt(0, true);
}
mb.RemovalDone();
nsAutoScriptLoaderDisabler sld(doc);
nsIAtom* contextLocalName = Tag();
int32_t contextNameSpaceID = GetNameSpaceID();
ShadowRoot* shadowRoot = ShadowRoot::FromNode(this);
if (shadowRoot) {
// Fix up the context to be the host of the ShadowRoot.
contextLocalName = shadowRoot->GetHost()->Tag();
contextNameSpaceID = shadowRoot->GetHost()->GetNameSpaceID();
}
if (doc->IsHTML()) {
int32_t oldChildCount = target->GetChildCount();
aError = nsContentUtils::ParseFragmentHTML(aInnerHTML,
target,
contextLocalName,
contextNameSpaceID,
doc->GetCompatibilityMode() ==
eCompatibility_NavQuirks,
true);
mb.NodesAdded();
// HTML5 parser has notified, but not fired mutation events.
nsContentUtils::FireMutationEventsForDirectParsing(doc, target,
oldChildCount);
} else {
nsRefPtr<DocumentFragment> df =
nsContentUtils::CreateContextualFragment(target, aInnerHTML, true, aError);
if (!aError.Failed()) {
// Suppress assertion about node removal mutation events that can't have
// listeners anyway, because no one has had the chance to register mutation
// listeners on the fragment that comes from the parser.
nsAutoScriptBlockerSuppressNodeRemoved scriptBlocker;
static_cast<nsINode*>(target)->AppendChild(*df, aError);
mb.NodesAdded();
}
}
}
nsINode::nsSlots*
FragmentOrElement::CreateSlots()
{
return new nsDOMSlots();
}
void
FragmentOrElement::FireNodeRemovedForChildren()
{
nsIDocument* doc = OwnerDoc();
// Optimize the common case
if (!nsContentUtils::
HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEREMOVED)) {
return;
}
nsCOMPtr<nsIDocument> owningDoc = doc;
nsCOMPtr<nsINode> child;
for (child = GetFirstChild();
child && child->GetParentNode() == this;
child = child->GetNextSibling()) {
nsContentUtils::MaybeFireNodeRemoved(child, this, doc);
}
}
size_t
FragmentOrElement::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = 0;
n += nsIContent::SizeOfExcludingThis(aMallocSizeOf);
n += mAttrsAndChildren.SizeOfExcludingThis(aMallocSizeOf);
nsDOMSlots* slots = GetExistingDOMSlots();
if (slots) {
n += slots->SizeOfIncludingThis(aMallocSizeOf);
}
return n;
}
void
FragmentOrElement::SetIsElementInStyleScopeFlagOnSubtree(bool aInStyleScope)
{
if (aInStyleScope && IsElementInStyleScope()) {
return;
}
if (IsElement()) {
SetIsElementInStyleScope(aInStyleScope);
SetIsElementInStyleScopeFlagOnShadowTree(aInStyleScope);
}
nsIContent* n = GetNextNode(this);
while (n) {
if (n->IsElementInStyleScope()) {
n = n->GetNextNonChildNode(this);
} else {
if (n->IsElement()) {
n->SetIsElementInStyleScope(aInStyleScope);
n->AsElement()->SetIsElementInStyleScopeFlagOnShadowTree(aInStyleScope);
}
n = n->GetNextNode(this);
}
}
}
void
FragmentOrElement::SetIsElementInStyleScopeFlagOnShadowTree(bool aInStyleScope)
{
NS_ASSERTION(IsElement(), "calling SetIsElementInStyleScopeFlagOnShadowTree "
"on a non-Element is useless");
ShadowRoot* shadowRoot = GetShadowRoot();
while (shadowRoot) {
shadowRoot->SetIsElementInStyleScopeFlagOnSubtree(aInStyleScope);
shadowRoot = shadowRoot->GetOlderShadowRoot();
}
}
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