components/script/dom/raredata.rs - main - githubmirror/servo

components/script/dom/raredata.rs
110 строк5 KB
Martin Robinson
script: Don't always allocate `NodeRareData` when accessing `WeakRangeVec` (#46440)
13 июл 2026, 15:31
13 июл 2026, 15:3196d984d
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use std::rc::Rc;

use euclid::Rect;
use style::selector_parser::PseudoElement;
use style_traits::CSSPixel;
use stylo_atoms::Atom;

use crate::dom::UniqueId;
use crate::dom::bindings::root::{Dom, MutNullableDom};
use crate::dom::customelementregistry::{
    CustomElementDefinition, CustomElementReaction, CustomElementRegistry, CustomElementState,
};
use crate::dom::domtokenlist::DOMTokenList;
use crate::dom::elementinternals::ElementInternals;
use crate::dom::html::htmlslotelement::SlottableData;
use crate::dom::intersectionobserver::IntersectionObserverRegistration;
use crate::dom::mutationobserver::RegisteredObserver;
use crate::dom::nodelist::NodeList;
use crate::dom::range::{Range, WeakRangeVec};
use crate::dom::shadowroot::ShadowRoot;
use crate::dom::types::Element;
use crate::dom::window::LayoutValue;

// XXX(ferjm) Ideally merge NodeRareData and ElementRareData so they share
//           storage.

#[derive(Default, JSTraceable, MallocSizeOf)]
#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
pub(crate) struct NodeRareData {
    /// The shadow root the node belongs to.
    /// This is None if the node is not in a shadow tree or
    /// if it is a ShadowRoot.
    pub(crate) containing_shadow_root: Option<Dom<ShadowRoot>>,
    /// Registered observers for this node.
    pub(crate) mutation_observers: Vec<RegisteredObserver>,
    /// Lazily-generated Unique Id for this node.
    pub(crate) unique_id: Option<UniqueId>,

    pub(crate) slottable_data: SlottableData,

    /// A vector of weak references to Range instances of which the start
    /// or end containers are this node. No range should ever be found
    /// twice in this vector, even if both the start and end containers
    /// are this node.
    pub(crate) weak_ranges: WeakRangeVec,

    /// The live list of children return by .childNodes.
    pub(crate) child_list: MutNullableDom<NodeList>,

    /// Whether this node represents a certain implemented pseudo-element.
    /// An implemented pseudo-element is a real element within a UA shadow tree
    /// that will match a certain pseudo-element selector.
    /// An example of this is the element matching the `::placeholder` selector.
    #[no_trace]
    pub(crate) implemented_pseudo_element: Option<PseudoElement>,
}

#[derive(Default, JSTraceable, MallocSizeOf)]
#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
pub(crate) struct ElementRareData {
    /// <https://dom.spec.whatwg.org/#dom-element-shadowroot>
    /// The ShadowRoot this element is host of.
    pub(crate) shadow_root: Option<Dom<ShadowRoot>>,
    /// <https://html.spec.whatwg.org/multipage/#custom-element-reaction-queue>
    pub(crate) custom_element_reaction_queue: Vec<CustomElementReaction>,
    /// <https://dom.spec.whatwg.org/#concept-element-custom-element-definition>
    #[conditional_malloc_size_of]
    pub(crate) custom_element_definition: Option<Rc<CustomElementDefinition>>,
    /// <https://dom.spec.whatwg.org/#concept-element-custom-element-state>
    pub(crate) custom_element_state: CustomElementState,
    /// <https://dom.spec.whatwg.org/#dom-element-customelementregistry>
    pub(crate) custom_element_registry: Option<Dom<CustomElementRegistry>>,
    /// The "name" content attribute; not used as frequently as id, but used
    /// in named getter loops so it's worth looking up quickly when present
    #[no_trace]
    pub(crate) name_attribute: Option<Atom>,
    /// The client rect reported by layout.
    #[no_trace]
    pub(crate) client_rect: Option<LayoutValue<Rect<i32, CSSPixel>>>,
    /// <https://html.spec.whatwg.org/multipage#elementinternals>
    pub(crate) element_internals: Option<Dom<ElementInternals>>,

    /// <https://w3c.github.io/IntersectionObserver/#element-private-slots>
    /// > Element objects have an internal [[RegisteredIntersectionObservers]] slot,
    /// > which is initialized to an empty list. This list holds IntersectionObserverRegistration records, which have:
    pub(crate) registered_intersection_observers: Vec<IntersectionObserverRegistration>,
    pub(crate) cryptographic_nonce: String,

    /// <https://drafts.csswg.org/css-shadow-parts/#element-forwarded-part-name-list>
    pub(crate) forwarded_part_names: Vec<(String, String)>,

    /// <https://drafts.csswg.org/css-shadow-parts/#dom-element-part>
    pub(crate) part: MutNullableDom<DOMTokenList>,

    /// <https://w3c.github.io/selection-api/#definition>
    /// > This one selection must be shared by all the content of the document (though not by nested documents),
    /// > including any editing hosts in the document.
    pub(crate) contenteditable_selection_range: MutNullableDom<Range>,

    /// Whether this element had duplicate attributes during tokenization.
    /// Used for CSP nonce validation (step 3 of "is element nonceable").
    pub(crate) had_duplicate_attributes: bool,

    /// <https://html.spec.whatwg.org/multipage/#previously-focused-element>
    pub(crate) previously_focused_element: MutNullableDom<Element>,
}