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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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4
components/script/dom/documentorshadowroot.rs
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@ -397,7 +397,7 @@ impl DocumentOrShadowRoot {
if stylesheet_remove_set.insert(sheet_to_remove) {
owner.remove_stylesheet(
StylesheetSource::Constructed(sheet_to_remove.clone()),
sheet_to_remove.style_stylesheet_arc(),
&sheet_to_remove.style_stylesheet(),
);
sheet_to_remove.remove_adopter(owner);
}
@ -416,7 +416,7 @@ impl DocumentOrShadowRoot {
// around.
owner.remove_stylesheet(
StylesheetSource::Constructed(sheet.clone()),
sheet.style_stylesheet_arc(),
&sheet.style_stylesheet(),
);
} else {
sheet.add_adopter(owner.clone());