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LibWeb: Don't create mutation record node lists if nobody is interested

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By deferring allocation of StaticNodeList objects until we know somebody
actually wants the MutationRecord, we avoid a *lot* of allocation work.

This shaves several seconds off of loading https://tc39.es/ecma262/

At least one other engine (WebKit) skips creating mutation records if
nobody is interested, so even if this is observable somehow, we would
at least match the behavior of a major engine.
This commit is contained in:
Andreas Kling 2023-05-17 19:47:16 +02:00
parent 0f2b6345c6
commit 80d6330a26
4 changed files with 22 additions and 31 deletions
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6
Userland/Libraries/LibWeb/DOM/Node.h
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -242,7 +242,7 @@ public:
void add_registered_observer(RegisteredObserver& registered_observer) { m_registered_observer_list.append(registered_observer); }
void queue_mutation_record(FlyString const& type, DeprecatedString attribute_name, DeprecatedString attribute_namespace, DeprecatedString old_value, JS::NonnullGCPtr<NodeList> added_nodes, JS::NonnullGCPtr<NodeList> removed_nodes, Node* previous_sibling, Node* next_sibling) const;
void queue_mutation_record(FlyString const& type, DeprecatedString attribute_name, DeprecatedString attribute_namespace, DeprecatedString old_value, Vector<JS::Handle<Node>> added_nodes, Vector<JS::Handle<Node>> removed_nodes, Node* previous_sibling, Node* next_sibling) const;
// https://dom.spec.whatwg.org/#concept-shadow-including-inclusive-descendant
template<typename Callback>
@ -671,7 +671,7 @@ protected:
ErrorOr<String> name_or_description(NameOrDescription, Document const&, HashTable<i32>&) const;
private:
void queue_tree_mutation_record(JS::NonnullGCPtr<NodeList> added_nodes, JS::NonnullGCPtr<NodeList> removed_nodes, Node* previous_sibling, Node* next_sibling);
void queue_tree_mutation_record(Vector<JS::Handle<Node>> added_nodes, Vector<JS::Handle<Node>> removed_nodes, Node* previous_sibling, Node* next_sibling);
void insert_before_impl(JS::NonnullGCPtr<Node>, JS::GCPtr<Node> child);
void append_child_impl(JS::NonnullGCPtr<Node>);