| /* |
| * 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))); |
| #if ENABLE(MATHML) |
| else if (is<MathMLElement>(node)) |
| wrapper = createJSMathMLWrapper(globalObject, static_reference_cast<MathMLElement>(WTFMove(node))); |
| #endif |
| 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 |
