Add fast path for querySelector(All)

Source/core/dom/SelectorQuery.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 22 matching lines @@
 
 namespace WebCore {
 
 typedef int ExceptionCode;
 
 class CSSSelector;
 class Document;
 class Element;
 class Node;
 class NodeList;
+class SimpleNodeList;
+class SpaceSplitString;
 
 class SelectorDataList {
 public:
     void initialize(const CSSSelectorList&);
     bool matches(Element*) const;
     PassRefPtr<NodeList> queryAll(Node* rootNode) const;
     PassRefPtr<Element> queryFirst(Node* rootNode) const;
 
 private:
     struct SelectorData {
         SelectorData(const CSSSelector* selector, bool isFastCheckable) : selector(selector), isFastCheckable(isFastCheckable) { }
         const CSSSelector* selector;
         bool isFastCheckable;
     };
 
+    bool canUseFastQuery(Node* rootNode) const;
     bool selectorMatches(const SelectorData&, Element*, const Node*) const;
-    std::pair<bool, Node*> findTraverseRoot(Node* traverseRoot) const;
-    template <bool firstMatchOnly>
-    void execute(Node* rootNode, Vector<RefPtr<Node> >&) const;
+    void collectElementsByClassName(Node* rootNode, const AtomicString& className, Vector<RefPtr<Node> >&) const;
+    Element* findElementByClassName(Node* rootNode, const AtomicString& className) const;
+    void collectElementsByTagName(Node* rootNode, const QualifiedName& tagName, Vector<RefPtr<Node> >&) const;
+    Element* findElementByTagName(Node* rootNode, const QualifiedName& tagName) const;
+    PassOwnPtr<SimpleNodeList> findTraverseRoots(Node* rootNode, bool& matchTraverseRoots) const;
+    void executeSlowQueryAll(Node* rootNode, Vector<RefPtr<Node> >& matchedElements) const;
+    void executeQueryAll(Node* rootNode, Vector<RefPtr<Node> >& matchedElements) const;
+    Node* findTraverseRoot(Node* rootNode, bool& matchTraverseRoot) const;
+    Element* executeSlowQueryFirst(Node* rootNode) const;
+    Element* executeQueryFirst(Node* rootNode) const;
 
     Vector<SelectorData> m_selectors;
 };
 
 class SelectorQuery {
     WTF_MAKE_NONCOPYABLE(SelectorQuery);
     WTF_MAKE_FAST_ALLOCATED;
 public:
     explicit SelectorQuery(const CSSSelectorList&);
     bool matches(Element*) const;
@@ skipping 10 matching lines @@
     SelectorQuery* add(const AtomicString&, Document*, ExceptionCode&);
     void invalidate();
 
 private:
     HashMap<AtomicString, OwnPtr<SelectorQuery> > m_entries;
 };
 
 }
 
 #endif