From 3c70b297c7be12b7d7e120de04a38f40b600928b Mon Sep 17 00:00:00 2001
From: Gaming4JC <g4jc@hyperbola.info>
Date: Sat, 25 Jan 2020 09:14:03 -0500
Subject: Bug 1430951 - Avoid element name atomizing to improve performance of
 LookupCustomElementDefinition

Since we are dealing with the element (nodeInfo->LocalName() and NameAtom() are the same value), we could use nodeInfo->NameAtom() instead.

Tag UXP Issue #1344
---
 dom/base/nsContentUtils.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'dom/base/nsContentUtils.cpp')

diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index 402dfd1c5..b6cbbbace 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -9536,9 +9536,11 @@ nsContentUtils::TryToUpgradeElement(Element* aElement)
   NodeInfo* nodeInfo = aElement->NodeInfo();
   RefPtr<nsIAtom> typeAtom =
     aElement->GetCustomElementData()->GetCustomElementType();
+
+  MOZ_ASSERT(nodeInfo->NameAtom()->Equals(nodeInfo->LocalName()));
   CustomElementDefinition* definition =
     nsContentUtils::LookupCustomElementDefinition(nodeInfo->GetDocument(),
-                                                  nodeInfo->LocalName(),
+                                                  nodeInfo->NameAtom(),
                                                   nodeInfo->NamespaceID(),
                                                   typeAtom);
   if (definition) {
@@ -9553,7 +9555,7 @@ nsContentUtils::TryToUpgradeElement(Element* aElement)
 
 /* static */ CustomElementDefinition*
 nsContentUtils::LookupCustomElementDefinition(nsIDocument* aDoc,
-                                              const nsAString& aLocalName,
+                                              nsIAtom* aNameAtom,
                                               uint32_t aNameSpaceID,
                                               nsIAtom* aTypeAtom)
 {
@@ -9577,7 +9579,7 @@ nsContentUtils::LookupCustomElementDefinition(nsIDocument* aDoc,
     return nullptr;
   }
 
-  return registry->LookupCustomElementDefinition(aLocalName, aTypeAtom);
+  return registry->LookupCustomElementDefinition(aNameAtom, aTypeAtom);
 }
 
 /* static */ void
-- 
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