WontFix: Add fast path for id/name/style/class in getAttribute/setAttribute bindings.

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index bb3e0aad6f5ef42a05593dfba29040649ea60d5c..c6a0edab66f32e92e4f95083385e3f8388168ee5 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -908,6 +908,50 @@ IntRect Element::screenRect() const
     return document().view()->contentsToScreen(renderer()->absoluteBoundingBoxRectIgnoringTransforms());
 }
 
+namespace {
+enum CallerType {
+    Getter,
+    Setter
+};
+
+template<CallerType caller> static inline const QualifiedName& fastAttributeNameFromString(const Element& element, const String& localName)
+{
+    unsigned length = localName.length();
+    if (!length)
+        return nullQName();
+    const StringImpl& name = *localName.impl();
+
+    if (length == 2 && name[0] == 'i' && name[1] == 'd')
+        return HTMLNames::idAttr;
+    if (length == 4 && name[0] == 'n' && name[1] == 'a' && name[2] == 'm' && name[3] == 'e')
+        return HTMLNames::nameAttr;
+    if ((caller == Setter || !element.isSVGElement()) && length == 5 && name[0] == 'c' && name[1] == 'l' && name[2] == 'a' && name[3] == 's' && name[4] == 's')
+        return HTMLNames::classAttr;
+    if (caller == Setter && length == 5 && name[0] == 's' && name[1] == 't' && name[2] == 'y' && name[3] == 'l' && name[4] == 'e')
+        return HTMLNames::styleAttr;
+
+    return nullQName();
+}
+}
+
+const AtomicString& Element::bindingsGetAttribute(const String& localName) const
+{
+    const QualifiedName& fastName = fastAttributeNameFromString<Getter>(*this, localName);
+    if (fastName != nullQName())
+        return fastGetAttribute(fastName);
+    return getAttribute(AtomicString(localName));
+}
+
+void Element::bindingsSetAttribute(const String& localName, const AtomicString& newValue, ExceptionState& exceptionState)
+{
+    const QualifiedName& fastName = fastAttributeNameFromString<Setter>(*this, localName);
+    if (fastName != nullQName()) {
+        setAttribute(fastName, newValue);
+        return;
+    }
+    setAttribute(AtomicString(localName), newValue, exceptionState);
+}
+
 const AtomicString& Element::getAttribute(const AtomicString& localName) const
 {
     if (!elementData())