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style: Use a SmallVec for common ancestors in the bloom filter.

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Emilio Cobos Álvarez 2017-05-19 04:59:51 +02:00
parent 05a26a2996
commit 1cea4e7942
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1 changed files with 8 additions and 5 deletions
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13
components/style/bloom.rs
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@ -9,6 +9,7 @@
use dom::{SendElement, TElement};
use selectors::bloom::BloomFilter;
use smallvec::SmallVec;
/// A struct that allows us to fast-reject deep descendant selectors avoiding
/// selector-matching.
@ -223,7 +224,7 @@ impl<E: TElement> StyleBloom<E> {
// Let's collect the parents we are going to need to insert once we've
// found the common one.
let mut parents_to_insert = vec![];
let mut parents_to_insert = SmallVec::<[E; 8]>::new();
// If the bloom filter still doesn't have enough elements, the common
// parent is up in the dom.
@ -245,10 +246,12 @@ impl<E: TElement> StyleBloom<E> {
// Not-so-happy case: Parent's don't match, so we need to keep going up
// until we find a common ancestor.
//
// Gecko currently models native anonymous content that conceptually hangs
// off the document (such as scrollbars) as a separate subtree from the
// document root. Thus it's possible with Gecko that we do not find any
// common ancestor.
// Gecko currently models native anonymous content that conceptually
// hangs off the document (such as scrollbars) as a separate subtree
// from the document root.
//
// Thus it's possible with Gecko that we do not find any common
// ancestor.
while **self.elements.last().unwrap() != common_parent {
parents_to_insert.push(common_parent);
self.pop().unwrap();