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script_bindings: Remove Cell wrapper from thread-local RootCollection. (#39043)

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This doesn't appear to make a big difference in speedometer results, but
this removes some code from the hot path of creating DomRoot values.

Before: `Score: 30.381097406624708 ± 2.0393225244958018`
After: `Score: 30.344639420871395 ± 1.9359337921154696`

Testing: Existing WPT coverage

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
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Josh Matthews 2025-08-30 15:47:26 -04:00 • committed by GitHub
parent d3c5a8ec15
commit 0481477f35
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6 changed files with 9 additions and 37 deletions
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16
components/script/dom/bindings/root.rs
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@ -27,7 +27,6 @@
use std::cell::{OnceCell, UnsafeCell};
use std::default::Default;
use std::hash::{Hash, Hasher};
use std::marker::PhantomData;
use std::{mem, ptr};
use js::jsapi::{Heap, JSObject, JSTracer, Value};
@ -43,21 +42,6 @@ use crate::dom::bindings::reflector::DomObject;
use crate::dom::bindings::trace::JSTraceable;
use crate::dom::node::Node;
pub(crate) struct ThreadLocalStackRoots<'a>(PhantomData<&'a u32>);
impl<'a> ThreadLocalStackRoots<'a> {
pub(crate) fn new(roots: &'a RootCollection) -> Self {
STACK_ROOTS.with(|r| r.set(Some(roots)));
ThreadLocalStackRoots(PhantomData)
}
}
impl Drop for ThreadLocalStackRoots<'_> {
fn drop(&mut self) {
STACK_ROOTS.with(|r| r.set(None));
}
}
pub(crate) trait ToLayout<T> {
/// Returns `LayoutDom<T>` containing the same pointer.
///