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dom: Move child_list to rare data (#35592)

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This is only created when calling the ChildNodes method. Gecko also stores it in their similar
data structure at https://searchfox.org/mozilla-central/rev/155d514d72473453492a822e97dc1c68cf49d110/dom/base/nsINode.h#1464

Signed-off-by: webbeef <me@webbeef.org>
This commit is contained in:
webbeef 2025-02-21 17:32:37 -08:00 • committed by GitHub
parent 6a182c345c
commit f7c1cd4635
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3 changed files with 19 additions and 15 deletions
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14
components/script/dom/node.rs
View file

@ -146,9 +146,6 @@ pub struct Node {
/// Rare node data.
rare_data: DomRefCell<Option<Box<NodeRareData>>>,
/// The live list of children return by .childNodes.
child_list: MutNullableDom<NodeList>,
/// The live count of children of this node.
children_count: Cell<u32>,
@ -1968,7 +1965,6 @@ impl Node {
prev_sibling: Default::default(),
owner_doc: MutNullableDom::new(doc),
rare_data: Default::default(),
child_list: Default::default(),
children_count: Cell::new(0u32),
flags: Cell::new(flags),
inclusive_descendants_version: Cell::new(0),
@ -2928,7 +2924,7 @@ impl NodeMethods<crate::DomTypeHolder> for Node {
/// <https://dom.spec.whatwg.org/#dom-node-childnodes>
fn ChildNodes(&self) -> DomRoot<NodeList> {
self.child_list.or_init(|| {
self.ensure_rare_data().child_list.or_init(|| {
let doc = self.owner_doc();
let window = doc.window();
NodeList::new_child_list(window, self)
@ -3608,9 +3604,13 @@ impl VirtualMethods for Node {
if let Some(s) = self.super_type() {
s.children_changed(mutation);
}
if let Some(list) = self.child_list.get() {
list.as_children_list().children_changed(mutation);
if let Some(data) = self.rare_data().as_ref() {
if let Some(list) = data.child_list.get() {
list.as_children_list().children_changed(mutation);
}
}
self.owner_doc().content_and_heritage_changed(self);
}

6
components/script/dom/raredata.rs
View file

@ -7,7 +7,7 @@ use std::rc::Rc;
use euclid::default::Rect;
use servo_atoms::Atom;
use crate::dom::bindings::root::Dom;
use crate::dom::bindings::root::{Dom, MutNullableDom};
use crate::dom::customelementregistry::{
CustomElementDefinition, CustomElementReaction, CustomElementState,
};
@ -16,6 +16,7 @@ use crate::dom::htmlslotelement::SlottableData;
use crate::dom::intersectionobserver::IntersectionObserverRegistration;
use crate::dom::mutationobserver::RegisteredObserver;
use crate::dom::node::UniqueId;
use crate::dom::nodelist::NodeList;
use crate::dom::range::WeakRangeVec;
use crate::dom::shadowroot::ShadowRoot;
use crate::dom::window::LayoutValue;
@ -42,6 +43,9 @@ pub(crate) struct NodeRareData {
/// twice in this vector, even if both the start and end containers
/// are this node.
pub(crate) ranges: WeakRangeVec,
/// The live list of children return by .childNodes.
pub(crate) child_list: MutNullableDom<NodeList>,
}
#[derive(Default, JSTraceable, MallocSizeOf)]

14
tests/unit/script/size_of.rs
View file

@ -30,10 +30,10 @@ macro_rules! sizeof_checker (
// Update the sizes here
sizeof_checker!(size_event_target, EventTarget, 48);
sizeof_checker!(size_node, Node, 176);
sizeof_checker!(size_element, Element, 352);
sizeof_checker!(size_htmlelement, HTMLElement, 368);
sizeof_checker!(size_div, HTMLDivElement, 368);
sizeof_checker!(size_span, HTMLSpanElement, 368);
sizeof_checker!(size_text, Text, 208);
sizeof_checker!(size_characterdata, CharacterData, 208);
sizeof_checker!(size_node, Node, 168);
sizeof_checker!(size_element, Element, 344);
sizeof_checker!(size_htmlelement, HTMLElement, 360);
sizeof_checker!(size_div, HTMLDivElement, 360);
sizeof_checker!(size_span, HTMLSpanElement, 360);
sizeof_checker!(size_text, Text, 200);
sizeof_checker!(size_characterdata, CharacterData, 200);