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style: Add attribute names to the bloom filter

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Safari does this. This reduces the runtime in the example linked from
comment 0 quite a lot (40ms on a local opt build, from ~130ms on a
release nightly build).

I added a pref because there's a slight chance of performance
regressions on pages that do not use attribute selectors, as we're now
doing more unconditional work per element (adding the attributes to the
bloom filter). But the trade-off should be worth it, I think.

Differential Revision: https://phabricator.services.mozilla.com/D111689
This commit is contained in:
Oriol Brufau 2023-05-16 23:20:00 +02:00
parent a7ca8022d3
commit e23a8bf0ad
5 changed files with 96 additions and 8 deletions
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5
components/style/gecko/selector_parser.rs
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@ -247,6 +247,11 @@ impl ::selectors::SelectorImpl for SelectorImpl {
type PseudoElement = PseudoElement;
type NonTSPseudoClass = NonTSPseudoClass;
fn should_collect_attr_hash(name: &AtomIdent) -> bool {
static_prefs::pref!("layout.css.bloom-filter-attribute-names.enabled") &&
!crate::bloom::is_attr_name_excluded_from_filter(name)
}
}
impl<'a> SelectorParser<'a> {