JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, Document* document)
{
if (!document)
return jsNull();
DOMObject* wrapper = getCachedDOMNodeWrapper(exec, document, document);
if (wrapper)
return wrapper;
if (document->isHTMLDocument())
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, HTMLDocument, document);
#if ENABLE(SVG)
else if (document->isSVGDocument())
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, SVGDocument, document);
#endif
else
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Document, document);
// Make sure the document is kept around by the window object, and works right with the
// back/forward cache.
if (!document->frame()) {
size_t nodeCount = 0;
for (Node* n = document; n; n = n->traverseNextNode())
nodeCount++;
exec->heap()->reportExtraMemoryCost(nodeCount * sizeof(Node));
}
return wrapper;
}
void JSSVGElementInstance::markChildren(MarkStack& markStack)
{
Base::markChildren(markStack);
// Mark the wrapper for our corresponding element, so it can mark its event handlers.
JSNode* correspondingWrapper = getCachedDOMNodeWrapper(impl()->correspondingElement()->document(), impl()->correspondingElement());
if (correspondingWrapper)
markStack.append(correspondingWrapper);
}
static ALWAYS_INLINE JSValue createWrapperInline(ExecState* exec, JSDOMGlobalObject* globalObject, Node* node)
{
ASSERT(node);
ASSERT(!getCachedDOMNodeWrapper(exec, node->document(), node));
JSNode* wrapper;
switch (node->nodeType()) {
case Node::ELEMENT_NODE:
if (node->isHTMLElement())
wrapper = createJSHTMLWrapper(exec, globalObject, static_cast<HTMLElement*>(node));
#if ENABLE(SVG)
else if (node->isSVGElement())
wrapper = createJSSVGWrapper(exec, globalObject, static_cast<SVGElement*>(node));
#endif
else
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Element, node);
break;
case Node::ATTRIBUTE_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Attr, node);
break;
case Node::TEXT_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Text, node);
break;
case Node::CDATA_SECTION_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, CDATASection, node);
break;
case Node::ENTITY_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Entity, node);
break;
case Node::PROCESSING_INSTRUCTION_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, ProcessingInstruction, node);
break;
case Node::COMMENT_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Comment, node);
break;
case Node::DOCUMENT_NODE:
// we don't want to cache the document itself in the per-document dictionary
return toJS(exec, globalObject, static_cast<Document*>(node));
case Node::DOCUMENT_TYPE_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, DocumentType, node);
break;
case Node::NOTATION_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Notation, node);
break;
case Node::DOCUMENT_FRAGMENT_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, DocumentFragment, node);
break;
case Node::ENTITY_REFERENCE_NODE:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, EntityReference, node);
break;
default:
wrapper = CREATE_DOM_NODE_WRAPPER(exec, globalObject, Node, node);
}
return wrapper;
}
JSValuePtr toJS(ExecState* exec, Node* node)
{
if (!node)
return jsNull();
JSNode* wrapper = getCachedDOMNodeWrapper(node->document(), node);
if (wrapper)
return wrapper;
return createWrapper(exec, node);
}
void JSNode::mark()
{
ASSERT(!marked());
Node* node = m_impl.get();
// Nodes in the document are kept alive by JSDocument::mark,
// so we have no special responsibilities and can just call the base class here.
if (node->inDocument()) {
// But if the document isn't marked we have to mark it to ensure that
// nodes reachable from this one are also marked
if (Document* doc = node->ownerDocument())
if (DOMObject* docWrapper = getCachedDOMObjectWrapper(*Heap::heap(this)->globalData(), doc))
if (!docWrapper->marked())
docWrapper->mark();
DOMObject::mark();
return;
}
// This is a node outside the document, so find the root of the tree it is in,
// and start marking from there.
Node* root = node;
for (Node* current = m_impl.get(); current; current = current->parentNode())
root = current;
// If we're already marking this tree, then we can simply mark this wrapper
// by calling the base class; our caller is iterating the tree.
if (root->inSubtreeMark()) {
DOMObject::mark();
return;
}
// Mark the whole tree; use the global set of roots to avoid reentering.
root->setInSubtreeMark(true);
for (Node* nodeToMark = root; nodeToMark; nodeToMark = nodeToMark->traverseNextNode()) {
JSNode* wrapper = getCachedDOMNodeWrapper(m_impl->document(), nodeToMark);
if (wrapper) {
if (!wrapper->marked())
wrapper->mark();
} else if (nodeToMark == node) {
// This is the case where the map from the document to wrappers has
// been cleared out, but a wrapper is being marked. For now, we'll
// let the rest of the tree of wrappers get collected, because we have
// no good way of finding them. Later we should test behavior of other
// browsers and see if we need to preserve other wrappers in this case.
if (!marked())
mark();
}
}
root->setInSubtreeMark(false);
// Double check that we actually ended up marked. This assert caught problems in the past.
ASSERT(marked());
}
void JSStyleSheet::mark()
{
Base::mark();
// This prevents us from having a style sheet with a dangling ownerNode pointer.
// A better solution would be to handle this on the DOM side -- if the style sheet
// is kept around, then we want the node to stay around too. One possibility would
// be to make ref/deref on the style sheet ref/deref the node instead, but there's
// a lot of disentangling of the CSS DOM objects that would need to happen first.
if (Node* ownerNode = impl()->ownerNode()) {
if (JSNode* ownerNodeWrapper = getCachedDOMNodeWrapper(ownerNode->document(), ownerNode)) {
if (!ownerNodeWrapper->marked())
ownerNodeWrapper->mark();
}
}
}