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script: Reduce ScriptThread TLS usage (#38875)

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We store a pointer to the ScriptThread singleton for a thread in
thread-local storage. While we don't have yet have profiles pointing to
this TLS access as a hot spot, we can remove a potential performance
footgun without a lot of effort by passing around small pieces of data
that we otherwise need to fetch from the ScriptThread.

Testing: Existing WPT is sufficient
Fixes: part of #37969

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-08-30 12:51:40 -04:00 • committed by GitHub
parent d1da1a995c
commit c97ec1b2fb
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17 changed files with 129 additions and 68 deletions
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9
components/script/dom/bindings/constructor.rs
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@ -52,7 +52,6 @@ use crate::dom::globalscope::GlobalScope;
use crate::dom::htmlelement::HTMLElement;
use crate::dom::window::Window;
use crate::script_runtime::{CanGc, JSContext, JSContext as SafeJSContext};
use crate::script_thread::ScriptThread;
/// <https://html.spec.whatwg.org/multipage/#htmlconstructor>
fn html_constructor(
@ -391,14 +390,6 @@ fn get_constructor_object_from_local_name(
true
}
pub(crate) fn pop_current_element_queue(can_gc: CanGc) {
ScriptThread::pop_current_element_queue(can_gc);
}
pub(crate) fn push_new_element_queue() {
ScriptThread::push_new_element_queue();
}
pub(crate) fn call_html_constructor<T: DerivedFrom<Element> + DomObject>(
cx: JSContext,
args: &CallArgs,