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Cache the parent CV identity on ValidationData.

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This will make the linear probing faster. If we end up implementing the two-tier
cache setup, this code will be unnecessary and can go away.

MozReview-Commit-ID: BRfV5ump34n
This commit is contained in:
Bobby Holley 2017-09-12 12:29:29 -07:00
parent 7b019f807b
commit 729db5ccec
2 changed files with 60 additions and 24 deletions
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42
components/style/sharing/mod.rs
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@ -76,7 +76,7 @@ use matching::MatchMethods;
use owning_ref::OwningHandle;
use properties::ComputedValues;
use selectors::matching::{ElementSelectorFlags, VisitedHandlingMode};
use servo_arc::Arc;
use servo_arc::{Arc, NonZeroPtrMut};
use smallbitvec::SmallBitVec;
use smallvec::SmallVec;
use std::marker::PhantomData;
@ -108,6 +108,16 @@ pub enum StyleSharingBehavior {
Disallow,
}
/// Opaque pointer type to compare ComputedValues identities.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct OpaqueComputedValues(NonZeroPtrMut<()>);
impl OpaqueComputedValues {
fn from(cv: &ComputedValues) -> Self {
let p = NonZeroPtrMut::new(cv as *const ComputedValues as *const () as *mut ());
OpaqueComputedValues(p)
}
}
/// Some data we want to avoid recomputing all the time while trying to share
/// style.
#[derive(Debug, Default)]
@ -121,6 +131,9 @@ pub struct ValidationData {
/// The list of presentational attributes of the element.
pres_hints: Option<SmallVec<[ApplicableDeclarationBlock; 5]>>,
/// The pointer identity of the parent ComputedValues.
parent_style_identity: Option<OpaqueComputedValues>,
/// The cached result of matching this entry against the revalidation
/// selectors.
revalidation_match_results: Option<SmallBitVec>,
@ -167,6 +180,18 @@ impl ValidationData {
&*self.class_list.as_ref().unwrap()
}
/// Get or compute the parent style identity.
pub fn parent_style_identity<E>(&mut self, el: E) -> OpaqueComputedValues
where E: TElement,
{
if self.parent_style_identity.is_none() {
let parent = el.inheritance_parent().unwrap();
self.parent_style_identity =
Some(OpaqueComputedValues::from(parent.borrow_data().unwrap().styles.primary()));
}
self.parent_style_identity.as_ref().unwrap().clone()
}
/// Computes the revalidation results if needed, and returns it.
/// Inline so we know at compile time what bloom_known_valid is.
#[inline]
@ -250,6 +275,11 @@ impl<E: TElement> StyleSharingCandidate<E> {
self.validation_data.pres_hints(self.element)
}
/// Get the parent style identity.
fn parent_style_identity(&mut self) -> OpaqueComputedValues {
self.validation_data.parent_style_identity(self.element)
}
/// Compute the bit vector of revalidation selector match results
/// for this candidate.
fn revalidation_match_results(
@ -304,6 +334,11 @@ impl<E: TElement> StyleSharingTarget<E> {
self.validation_data.pres_hints(self.element)
}
/// Get the parent style identity.
fn parent_style_identity(&mut self) -> OpaqueComputedValues {
self.validation_data.parent_style_identity(self.element)
}
fn revalidation_match_results(
&mut self,
stylist: &Stylist,
@ -615,10 +650,7 @@ impl<E: TElement> StyleSharingCache<E> {
// share styles and permit sharing across their children. The latter
// check allows us to share style between cousins if the parents
// shared style.
let parent = target.inheritance_parent();
let candidate_parent = candidate.element.inheritance_parent();
if parent != candidate_parent &&
!checks::can_share_style_across_parents(parent, candidate_parent) {
if !checks::parents_allow_sharing(target, candidate) {
trace!("Miss: Parent");
return false;
}