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Auto merge of #20250 - emilio:style-sharing-checks-order, r=xidorn

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style: Reorder style sharing checks so that cheaper and broader ones are earlier.

This was reviewed by Xidorn in #20223, but that needs to wait for a few days so let's land this separately.

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bors-servo 2018-03-08 16:52:43 -05:00 • committed by GitHub
commit 21290276c2
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1 changed files with 23 additions and 23 deletions
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46
components/style/sharing/mod.rs
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@ -656,6 +656,29 @@ impl<E: TElement> StyleSharingCache<E> {
return None;
}
if target.local_name() != candidate.element.local_name() {
trace!("Miss: Local Name");
return None;
}
if target.namespace() != candidate.element.namespace() {
trace!("Miss: Namespace");
return None;
}
// We do not ignore visited state here, because Gecko needs to store
// extra bits on visited style contexts, so these contexts cannot be
// shared.
if target.element.state() != candidate.state() {
trace!("Miss: User and Author State");
return None;
}
if target.is_link() != candidate.element.is_link() {
trace!("Miss: Link");
return None;
}
// Note that in the XBL case, we should be able to assert that the
// scopes are different, since two elements with different XBL bindings
// need to necessarily have different style (and thus children of them
@ -676,35 +699,12 @@ impl<E: TElement> StyleSharingCache<E> {
return None;
}
if target.local_name() != candidate.element.local_name() {
trace!("Miss: Local Name");
return None;
}
if target.namespace() != candidate.element.namespace() {
trace!("Miss: Namespace");
return None;
}
if target.is_link() != candidate.element.is_link() {
trace!("Miss: Link");
return None;
}
if target.matches_user_and_author_rules() !=
candidate.element.matches_user_and_author_rules() {
trace!("Miss: User and Author Rules");
return None;
}
// We do not ignore visited state here, because Gecko
// needs to store extra bits on visited style contexts,
// so these contexts cannot be shared
if target.element.state() != candidate.state() {
trace!("Miss: User and Author State");
return None;
}
// It's possible that there are no styles for either id.
let may_match_different_id_rules =
checks::may_match_different_id_rules(