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LibWeb: Only allocate DOM::Node registered observer list on demand
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.
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4 changed files with 53 additions and 32 deletions
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@ -608,9 +608,11 @@ void queue_mutation_observer_microtask(DOM::Document const& document)
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if (node.is_null())
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continue;
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node->registered_observers_list().remove_all_matching([&mutation_observer](DOM::RegisteredObserver& registered_observer) {
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return is<DOM::TransientRegisteredObserver>(registered_observer) && static_cast<DOM::TransientRegisteredObserver&>(registered_observer).observer().ptr() == mutation_observer.ptr();
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});
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if (node->registered_observer_list()) {
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node->registered_observer_list()->remove_all_matching([&mutation_observer](DOM::RegisteredObserver& registered_observer) {
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return is<DOM::TransientRegisteredObserver>(registered_observer) && static_cast<DOM::TransientRegisteredObserver&>(registered_observer).observer().ptr() == mutation_observer.ptr();
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});
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}
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}
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// 4. If records is not empty, then invoke mo’s callback with « records, mo », and mo. If this throws an exception, catch it, and report the exception.
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