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Reuse StylesheetContent for inline style sheets with identical content (#38540)

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For duplicate style sheets with identical content, `StylesheetContents`
can be reused to avoid redundant parsing of the inline style sheets.
Since duplicate stylesheets is a common case with web components, this
change will significantly improve performance. Additionally, the cache
hit rate of stylo's `CascadeDataCache` can now be significantly
improved.

When shared `StylesheetContents` is modified, copy-on-write will occur
to avoid affecting other sharers. And then updates the references to
`CssRule` or `PropertyDeclarationBlock` stored in the CSSOMs to ensure
that modifications are made only on the new copy.

Signed-off-by: sharpshooter_pt <ibluegalaxy_taoj@163.com>
This commit is contained in:
JoeDow 2025-08-20 20:31:49 +08:00 • committed by GitHub
parent f6b77f94e2
commit 6e6ef513a9
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25 changed files with 711 additions and 125 deletions
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15
components/script/dom/cssgroupingrule.rs
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@ -3,8 +3,9 @@
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use dom_struct::dom_struct;
use style::shared_lock::SharedRwLock;
use style::stylesheets::{CssRuleType, CssRuleTypes};
use servo_arc::Arc;
use style::shared_lock::{Locked, SharedRwLock, SharedRwLockReadGuard};
use style::stylesheets::{CssRuleType, CssRuleTypes, CssRules};
use crate::dom::bindings::codegen::Bindings::CSSGroupingRuleBinding::CSSGroupingRuleMethods;
use crate::dom::bindings::error::{ErrorResult, Fallible};
@ -62,6 +63,16 @@ impl CSSGroupingRule {
pub(crate) fn shared_lock(&self) -> &SharedRwLock {
self.cssrule.shared_lock()
}
pub(crate) fn update_rules(
&self,
rules: &Arc<Locked<CssRules>>,
guard: &SharedRwLockReadGuard,
) {
if let Some(rulelist) = self.rulelist.get() {
rulelist.update_rules(RulesSource::Rules(rules.clone()), guard);
}
}
}
impl CSSGroupingRuleMethods<crate::DomTypeHolder> for CSSGroupingRule {