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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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8
Userland/Libraries/LibWeb/DOM/Node.h
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@ -254,10 +254,10 @@ public:
size_t length() const;
auto& registered_observers_list() { return m_registered_observer_list; }
auto const& registered_observers_list() const { return m_registered_observer_list; }
auto& registered_observer_list() { return m_registered_observer_list; }
auto const& registered_observer_list() const { return m_registered_observer_list; }
void add_registered_observer(RegisteredObserver& registered_observer) { m_registered_observer_list.append(registered_observer); }
void add_registered_observer(RegisteredObserver&);
void queue_mutation_record(FlyString const& type, Optional<FlyString> const& attribute_name, Optional<FlyString> const& attribute_namespace, Optional<String> const& old_value, Vector<JS::Handle<Node>> added_nodes, Vector<JS::Handle<Node>> removed_nodes, Node* previous_sibling, Node* next_sibling) const;
@ -693,7 +693,7 @@ protected:
// https://dom.spec.whatwg.org/#registered-observer-list
// "Nodes have a strong reference to registered observers in their registered observer list." https://dom.spec.whatwg.org/#garbage-collection
Vector<JS::NonnullGCPtr<RegisteredObserver>> m_registered_observer_list;
OwnPtr<Vector<JS::NonnullGCPtr<RegisteredObserver>>> m_registered_observer_list;
void build_accessibility_tree(AccessibilityTreeNode& parent);