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Implement class selector fast path and add related tests for performance optimization

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wuggy 2026-09-07 14:12:03 -07:00
commit 80cfaf0891
8 changed files with 233 additions and 2 deletions
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46
dom/base/nsINode.cpp
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@ -2927,6 +2927,35 @@ FindMatchingElementsWithId(const nsAString& aId, nsINode* aRoot,
// Actually find elements matching aSelectorList (which must not be
// null) and which are descendants of aRoot and put them in aList. If
// onlyFirstMatch, then stop once the first one is found.
template<bool onlyFirstMatch, class Collector, class T>
static void
FindMatchingElementsWithClass(nsINode* aRoot, nsIAtom* aClass,
nsCaseTreatment aCaseTreatment, T& aList)
{
Collector results;
for (nsIContent* cur = aRoot->GetFirstChild(); cur;
cur = cur->GetNextNode(aRoot)) {
if (!cur->IsElement()) {
continue;
}
const nsAttrValue* classes = cur->AsElement()->GetClasses();
if (classes && classes->Contains(aClass, aCaseTreatment)) {
if (onlyFirstMatch) {
aList.AppendElement(cur->AsElement());
return;
}
results.AppendElement(cur->AsElement());
}
}
const uint32_t len = results.Length();
if (len) {
aList.SetCapacity(len);
for (uint32_t i = 0; i < len; ++i) {
aList.AppendElement(results.ElementAt(i));
}
}
}
template<bool onlyFirstMatch, class Collector, class T>
MOZ_ALWAYS_INLINE static void
FindMatchingElements(nsINode* aRoot, nsCSSSelectorList* aSelectorList, T &aList,
@ -2934,6 +2963,23 @@ FindMatchingElements(nsINode* aRoot, nsCSSSelectorList* aSelectorList, T &aList,
{
nsIDocument* doc = aRoot->OwnerDoc();
// Parsed selectors are already cached by the document. A lone class needs
// only an atom lookup per element, not the general CSS matching context.
nsCSSSelector* selector = aSelectorList->mSelectors;
if (!aSelectorList->mNext && !selector->mNext &&
selector->mClassList && !selector->mClassList->mNext &&
!selector->mLowercaseTag && !selector->mIDList &&
!selector->mAttrList && !selector->mPseudoClassList &&
!selector->mNegations && selector->mNameSpace == kNameSpaceID_Unknown &&
selector->IsRestrictedSelector() && !selector->IsHybridPseudoElement()) {
nsCaseTreatment caseTreatment =
doc->GetCompatibilityMode() == eCompatibility_NavQuirks
? eIgnoreCase : eCaseMatters;
FindMatchingElementsWithClass<onlyFirstMatch, Collector>(
aRoot, selector->mClassList->mAtom, caseTreatment, aList);
return;
}
TreeMatchContext matchingContext(false, nsRuleWalker::eRelevantLinkUnvisited,
doc, TreeMatchContext::eNeverMatchVisited);
doc->FlushPendingLinkUpdates();