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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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2
components/script/dom/domparser.rs
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@ -104,6 +104,7 @@ impl DOMParserMethods<crate::DomTypeHolder> for DOMParser {
false,
Some(doc.insecure_requests_policy()),
doc.has_trustworthy_ancestor_or_current_origin(),
doc.custom_element_reaction_stack(),
can_gc,
);
// Step switch-1. Parse HTML from a string given document and compliantString.
@ -131,6 +132,7 @@ impl DOMParserMethods<crate::DomTypeHolder> for DOMParser {
false,
Some(doc.insecure_requests_policy()),
doc.has_trustworthy_ancestor_or_current_origin(),
doc.custom_element_reaction_stack(),
can_gc,
);
// Step switch-1. Create an XML parser parser, associated with document,