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/*
* Copyright (C) 2007, 2009-2010, 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JSNode.h"
#include "Attr.h"
#include "CDATASection.h"
#include "Comment.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "DocumentType.h"
#include "HTMLAudioElement.h"
#include "HTMLCanvasElement.h"
#include "HTMLElement.h"
#include "HTMLFrameElementBase.h"
#include "HTMLImageElement.h"
#include "HTMLLinkElement.h"
#include "HTMLNames.h"
#include "HTMLScriptElement.h"
#include "HTMLStyleElement.h"
#include "JSAttr.h"
#include "JSCDATASection.h"
#include "JSComment.h"
#include "JSDOMBinding.h"
#include "JSDocument.h"
#include "JSDocumentFragment.h"
#include "JSDocumentType.h"
#include "JSEventListener.h"
#include "JSHTMLElement.h"
#include "JSHTMLElementWrapperFactory.h"
#include "JSMathMLElementWrapperFactory.h"
#include "JSProcessingInstruction.h"
#include "JSSVGElementWrapperFactory.h"
#include "JSShadowRoot.h"
#include "JSText.h"
#include "MathMLElement.h"
#include "Node.h"
#include "ProcessingInstruction.h"
#include "RegisteredEventListener.h"
#include "SVGElement.h"
#include "ScriptState.h"
#include "ShadowRoot.h"
#include "GCReachableRef.h"
#include "StyleSheet.h"
#include "StyledElement.h"
#include "Text.h"
namespace WebCore {
using namespace JSC;
using namespace HTMLNames;
static inline bool isReachableFromDOM(Node* node, SlotVisitor& visitor, const char** reason)
{
if (!node->isConnected()) {
if (is<Element>(*node)) {
auto& element = downcast<Element>(*node);
// If a wrapper is the last reference to an image element
// that is loading but not in the document, the wrapper is observable
// because it is the only thing keeping the image element alive, and if
// the element is destroyed, its load event will not fire.
// FIXME: The DOM should manage this issue without the help of JavaScript wrappers.
if (is<HTMLImageElement>(element)) {
if (downcast<HTMLImageElement>(element).hasPendingActivity()) {
if (UNLIKELY(reason))
*reason = "Image element with pending activity";
return true;
}
}
#if ENABLE(VIDEO)
else if (is<HTMLAudioElement>(element)) {
if (!downcast<HTMLAudioElement>(element).paused()) {
if (UNLIKELY(reason))
*reason = "Audio element which is not paused";
return true;
}
}
#endif
}
// If a node is firing event listeners, its wrapper is observable because
// its wrapper is responsible for marking those event listeners.
if (node->isFiringEventListeners()) {
if (UNLIKELY(reason))
*reason = "Node which is firing event listeners";
return true;
}
if (GCReachableRefMap::contains(*node)) {
if (UNLIKELY(reason))
*reason = "Node is scheduled to be used in an async script invocation)";
return true;
}
}
if (UNLIKELY(reason))
*reason = "Connected node";
return visitor.containsOpaqueRoot(root(node));
}
bool JSNodeOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, SlotVisitor& visitor, const char** reason)
{
JSNode* jsNode = jsCast<JSNode*>(handle.slot()->asCell());
return isReachableFromDOM(&jsNode->wrapped(), visitor, reason);
}
JSScope* JSNode::pushEventHandlerScope(JSGlobalObject* lexicalGlobalObject, JSScope* node) const
{
if (inherits<JSHTMLElement>(lexicalGlobalObject->vm()))
return jsCast<const JSHTMLElement*>(this)->pushEventHandlerScope(lexicalGlobalObject, node);
return node;
}
void JSNode::visitAdditionalChildren(SlotVisitor& visitor)
{
visitor.addOpaqueRoot(root(wrapped()));
}
static ALWAYS_INLINE JSValue createWrapperInline(JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, Ref<Node>&& node)
{
ASSERT(!getCachedWrapper(globalObject->world(), node));
JSDOMObject* wrapper;
switch (node->nodeType()) {
case Node::ELEMENT_NODE:
if (is<HTMLElement>(node))
wrapper = createJSHTMLWrapper(globalObject, static_reference_cast<HTMLElement>(WTFMove(node)));
else if (is<SVGElement>(node))
wrapper = createJSSVGWrapper(globalObject, static_reference_cast<SVGElement>(WTFMove(node)));
else if (is<MathMLElement>(node))
wrapper = createJSMathMLWrapper(globalObject, static_reference_cast<MathMLElement>(WTFMove(node)));
else
wrapper = createWrapper<Element>(globalObject, WTFMove(node));
break;
case Node::ATTRIBUTE_NODE:
wrapper = createWrapper<Attr>(globalObject, WTFMove(node));
break;
case Node::TEXT_NODE:
wrapper = createWrapper<Text>(globalObject, WTFMove(node));
break;
case Node::CDATA_SECTION_NODE:
wrapper = createWrapper<CDATASection>(globalObject, WTFMove(node));
break;
case Node::PROCESSING_INSTRUCTION_NODE:
wrapper = createWrapper<ProcessingInstruction>(globalObject, WTFMove(node));
break;
case Node::COMMENT_NODE:
wrapper = createWrapper<Comment>(globalObject, WTFMove(node));
break;
case Node::DOCUMENT_NODE:
// we don't want to cache the document itself in the per-document dictionary
return toJS(lexicalGlobalObject, globalObject, downcast<Document>(node.get()));
case Node::DOCUMENT_TYPE_NODE:
wrapper = createWrapper<DocumentType>(globalObject, WTFMove(node));
break;
case Node::DOCUMENT_FRAGMENT_NODE:
if (node->isShadowRoot())
wrapper = createWrapper<ShadowRoot>(globalObject, WTFMove(node));
else
wrapper = createWrapper<DocumentFragment>(globalObject, WTFMove(node));
break;
default:
wrapper = createWrapper<Node>(globalObject, WTFMove(node));
}
return wrapper;
}
JSValue createWrapper(JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, Ref<Node>&& node)
{
return createWrapperInline(lexicalGlobalObject, globalObject, WTFMove(node));
}
JSValue toJSNewlyCreated(JSGlobalObject* lexicalGlobalObject, JSDOMGlobalObject* globalObject, Ref<Node>&& node)
{
return createWrapperInline(lexicalGlobalObject, globalObject, WTFMove(node));
}
JSC::JSObject* getOutOfLineCachedWrapper(JSDOMGlobalObject* globalObject, Node& node)
{
ASSERT(!globalObject->world().isNormal());
return globalObject->world().wrappers().get(&node);
}
void willCreatePossiblyOrphanedTreeByRemovalSlowCase(Node* root)
{
JSC::JSGlobalObject* lexicalGlobalObject = mainWorldExecState(root->document().frame());
if (!lexicalGlobalObject)
return;
JSLockHolder lock(lexicalGlobalObject);
toJS(lexicalGlobalObject, static_cast<JSDOMGlobalObject*>(lexicalGlobalObject), *root);
}
} // namespace WebCore