Inline the fast path for handle creation....

src/handles.h

 // Copyright 2006-2008 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 100 matching lines @@
   }
 
   ~HandleScope() {
     Leave(&previous_);
   }
 
   // Counts the number of allocated handles.
   static int NumberOfHandles();
 
   // Creates a new handle with the given value.
-  static void** CreateHandle(void* value);
+  static inline void** CreateHandle(void* value) {
+    void** result = current_.next;
+    if (result == current_.limit) result = Extend();
+    // Update the current next field, set the value in the created
+    // handle, and return the result.
+    ASSERT(result < current_.limit);
+    current_.next = result + 1;
+    *result = value;
+    return result;
+  }
 
  private:
   // Prevent heap allocation or illegal handle scopes.
   HandleScope(const HandleScope&);
   void operator=(const HandleScope&);
   void* operator new(size_t size);
   void operator delete(void* size_t);
 
   static v8::ImplementationUtilities::HandleScopeData current_;
   const v8::ImplementationUtilities::HandleScopeData previous_;
@@ skipping 11 matching lines @@
       const v8::ImplementationUtilities::HandleScopeData* previous) {
     if (current_.extensions > 0) {
       DeleteExtensions();
     }
     current_ = *previous;
 #ifdef DEBUG
     ZapRange(current_.next, current_.limit);
 #endif
   }
 
+  // Extend the handle scope making room for more handles.
+  static void** Extend();
+
   // Deallocates any extensions used by the current scope.
   static void DeleteExtensions();
 
   // Zaps the handles in the half-open interval [start, end).
   static void ZapRange(void** start, void** end);
 
   friend class v8::HandleScope;
   friend class v8::ImplementationUtilities;
 };
 
@@ skipping 152 matching lines @@
  private:
   bool has_been_transformed_;  // Tells whether the object has been transformed.
   int unused_property_fields_;  // Captures the unused number of field.
   Handle<JSObject> object_;    // The object being optimized.
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_H_