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LibWeb: Only allocate DOM::Node registered observer list on demand

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Most DOM nodes don't have registered mutation observers, so let's put
the metadata about them behind an OwnPtr to save space in the common
case.

Saves 16 bytes per DOM node that doesn't have registered observers.
This commit is contained in:
Andreas Kling 2023-11-18 11:22:51 +01:00
parent c1fd55ce94
commit 9edfd5e360
4 changed files with 53 additions and 32 deletions
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23
Userland/Libraries/LibWeb/DOM/Node.cpp
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@ -103,8 +103,10 @@ void Node::visit_edges(Cell::Visitor& visitor)
visitor.visit(m_layout_node);
visitor.visit(m_paintable);
for (auto& registered_observer : m_registered_observer_list)
visitor.visit(registered_observer);
if (m_registered_observer_list) {
for (auto& registered_observer : *m_registered_observer_list)
visitor.visit(registered_observer);
}
}
// https://dom.spec.whatwg.org/#dom-node-baseuri
@ -686,10 +688,12 @@ void Node::remove(bool suppress_observers)
// if registered’s options["subtree"] is true, then append a new transient registered observer
// whose observer is registered’s observer, options is registered’s options, and source is registered to node’s registered observer list.
for (auto* inclusive_ancestor = parent; inclusive_ancestor; inclusive_ancestor = inclusive_ancestor->parent()) {
for (auto& registered : inclusive_ancestor->m_registered_observer_list) {
if (!inclusive_ancestor->m_registered_observer_list)
continue;
for (auto& registered : *inclusive_ancestor->m_registered_observer_list) {
if (registered->options().subtree) {
auto transient_observer = TransientRegisteredObserver::create(registered->observer(), registered->options(), registered);
m_registered_observer_list.append(move(transient_observer));
m_registered_observer_list->append(move(transient_observer));
}
}
}
@ -1546,7 +1550,9 @@ void Node::queue_mutation_record(FlyString const& type, Optional<FlyString> cons
// 2. Let nodes be the inclusive ancestors of target.
// 3. For each node in nodes, and then for each registered of node’s registered observer list:
for (auto* node = this; node; node = node->parent()) {
for (auto& registered_observer : node->m_registered_observer_list) {
if (!node->m_registered_observer_list)
continue;
for (auto& registered_observer : *node->m_registered_observer_list) {
// 1. Let options be registered’s options.
auto& options = registered_observer->options();
@ -1995,4 +2001,11 @@ ErrorOr<void> Node::prepend_with_space(StringBuilder x, StringView const& result
return {};
}
void Node::add_registered_observer(RegisteredObserver& registered_observer)
{
if (!m_registered_observer_list)
m_registered_observer_list = make<Vector<JS::NonnullGCPtr<RegisteredObserver>>>();
m_registered_observer_list->append(registered_observer);
}
}