Inline fast case of the method that ensures that an array has a

src/objects.h

 // Copyright 2006-2009 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 3964 matching lines @@
   Object* Initialize(int capacity);
 
   // Set the content of the array to the content of storage.
   inline void SetContent(FixedArray* storage);
 
   // Casting.
   static inline JSArray* cast(Object* obj);
 
   // Uses handles.  Ensures that the fixed array backing the JSArray has at
   // least the stated size.
-  void EnsureSize(int minimum_size_of_backing_fixed_array);
+  inline void EnsureSize(int minimum_size_of_backing_fixed_array);
 
   // Dispatched behavior.
 #ifdef DEBUG
   void JSArrayPrint();
   void JSArrayVerify();
 #endif
 
   // Layout description.
   static const int kLengthOffset = JSObject::kHeaderSize;
   static const int kSize = kLengthOffset + kPointerSize;
 
  private:
+  // Expand the fixed array backing of a fast-case JSArray to at least
+  // the requested size.
+  void Expand(int minimum_size_of_backing_fixed_array);
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSArray);
 };
 
 
 // An accessor must have a getter, but can have no setter.
 //
 // When setting a property, V8 searches accessors in prototypes.
 // If an accessor was found and it does not have a setter,
 // the request is ignored.
 //
@@ skipping 436 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_