Implement simple effect typing for variables

src/splay-tree-inl.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 73 matching lines @@
 template<typename Config, class Allocator>
 bool SplayTree<Config, Allocator>::FindInternal(const Key& key) {
   if (is_empty())
     return false;
   Splay(key);
   return Config::Compare(key, root_->key_) == 0;
 }
 
 
 template<typename Config, class Allocator>
+bool SplayTree<Config, Allocator>::Contains(const Key& key) {
+  return FindInternal(key);
+}
+
+
+template<typename Config, class Allocator>
 bool SplayTree<Config, Allocator>::Find(const Key& key, Locator* locator) {
   if (FindInternal(key)) {
     locator->bind(root_);
     return true;
   } else {
     return false;
   }
 }
 
 
@@ skipping 182 matching lines @@
 
 template <typename Config, class Allocator> template <class Callback>
 void SplayTree<Config, Allocator>::ForEach(Callback* callback) {
   NodeToPairAdaptor<Callback> callback_adaptor(callback);
   ForEachNode(&callback_adaptor);
 }
 
 
 template <typename Config, class Allocator> template <class Callback>
 void SplayTree<Config, Allocator>::ForEachNode(Callback* callback) {
+  if (root_ == NULL) return;
   // Pre-allocate some space for tiny trees.
   List<Node*, Allocator> nodes_to_visit(10, allocator_);
-  if (root_ != NULL) nodes_to_visit.Add(root_, allocator_);
+  nodes_to_visit.Add(root_, allocator_);
   int pos = 0;
   while (pos < nodes_to_visit.length()) {
     Node* node = nodes_to_visit[pos++];
     if (node->left() != NULL) nodes_to_visit.Add(node->left(), allocator_);
     if (node->right() != NULL) nodes_to_visit.Add(node->right(), allocator_);
     callback->Call(node);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPLAY_TREE_INL_H_