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Use a different visitor pass for gathering revalidation selectors.

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This allows us to ignore everything to the left of the rightmost simple selector.

MozReview-Commit-ID: 6I4VzKos22n
This commit is contained in:
Bobby Holley 2017-04-24 13:06:44 -07:00
parent dd4575c23a
commit 2df9dc2b03
2 changed files with 77 additions and 51 deletions
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49
components/style/restyle_hints.rs
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@ -417,38 +417,6 @@ fn is_attr_selector(sel: &Component<SelectorImpl>) -> bool {
}
}
/// Whether a selector containing this simple selector needs to be explicitly
/// matched against both the style sharing cache entry and the candidate.
///
/// We use this for selectors that can have different matching behavior between
/// siblings that are otherwise identical as far as the cache is concerned.
fn needs_cache_revalidation(sel: &Component<SelectorImpl>) -> bool {
match *sel {
Component::AttrExists(_) |
Component::AttrEqual(_, _, _) |
Component::AttrIncludes(_, _) |
Component::AttrDashMatch(_, _) |
Component::AttrPrefixMatch(_, _) |
Component::AttrSubstringMatch(_, _) |
Component::AttrSuffixMatch(_, _) |
Component::Empty |
Component::FirstChild |
Component::LastChild |
Component::OnlyChild |
Component::NthChild(..) |
Component::NthLastChild(..) |
Component::NthOfType(..) |
Component::NthLastOfType(..) |
Component::FirstOfType |
Component::LastOfType |
Component::OnlyOfType => true,
// FIXME(emilio): This sets the "revalidation" flag for :any, which is
// probably expensive given we use it a lot in UA sheets.
Component::NonTSPseudoClass(ref p) => p.state_flag().is_empty(),
_ => false,
}
}
fn combinator_to_restyle_hint(combinator: Option<Combinator>) -> RestyleHint {
match combinator {
None => RESTYLE_SELF,
@ -515,7 +483,6 @@ struct Dependency {
struct SensitivitiesVisitor {
sensitivities: Sensitivities,
hint: RestyleHint,
needs_revalidation: bool,
}
impl SelectorVisitor for SensitivitiesVisitor {
@ -525,7 +492,6 @@ impl SelectorVisitor for SensitivitiesVisitor {
_: SelectorIter<SelectorImpl>,
combinator: Option<Combinator>) -> bool {
self.hint |= combinator_to_restyle_hint(combinator);
self.needs_revalidation |= self.hint.contains(RESTYLE_LATER_SIBLINGS);
true
}
@ -537,10 +503,6 @@ impl SelectorVisitor for SensitivitiesVisitor {
self.sensitivities.attrs = is_attr_selector(s);
}
if !self.needs_revalidation {
self.needs_revalidation = needs_cache_revalidation(s);
}
true
}
}
@ -575,22 +537,18 @@ impl DependencySet {
}
}
/// Adds a selector to this `DependencySet`, and returns whether it may need
/// cache revalidation, that is, whether two siblings of the same "shape"
/// may have different style due to this selector.
pub fn note_selector(&mut self, selector: &Selector<SelectorImpl>) -> bool {
/// Adds a selector to this `DependencySet`.
pub fn note_selector(&mut self, selector: &Selector<SelectorImpl>) {
let mut is_pseudo_element = selector.pseudo_element.is_some();
let mut next = Some(selector.inner.complex.clone());
let mut combinator = None;
let mut needs_revalidation = false;
while let Some(current) = next.take() {
// Set up our visitor.
let mut visitor = SensitivitiesVisitor {
sensitivities: Sensitivities::new(),
hint: combinator_to_restyle_hint(combinator),
needs_revalidation: false,
};
if is_pseudo_element {
@ -623,7 +581,6 @@ impl DependencySet {
}
// Note what we found.
needs_revalidation |= visitor.needs_revalidation;
if !visitor.sensitivities.is_empty() {
self.add_dependency(Dependency {
sensitivities: visitor.sensitivities,
@ -633,8 +590,6 @@ impl DependencySet {
}
}
needs_revalidation
}
/// Create an empty `DependencySet`.