runtime/BatchedTransitionOptimizer.h

   1 // -*- mode: c++; c-basic-offset: 4 -*-
   2 /*
   3  * Copyright (C) 2008 Apple Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef BatchedTransitionOptimizer_h
  28 #define BatchedTransitionOptimizer_h
  29
  30 #include "JSObject.h"
  31
  32 namespace JSC {
  33
  34 class BatchedTransitionOptimizer {
  35     WTF_MAKE_NONCOPYABLE(BatchedTransitionOptimizer);
  36 public:
  37     BatchedTransitionOptimizer(VM& vm, JSObject* object)
  38         : m_vm(&vm)
  39         , m_object(object)
  40     {
  41         if (!m_object->structure(vm)->isDictionary())
  42             m_object->convertToDictionary(vm);
  43     }
  44
  45     ~BatchedTransitionOptimizer()
  46     {
  47         if (m_object->structure()->isDictionary())
  48             m_object->flattenDictionaryObject(*m_vm);
  49     }
  50
  51 private:
  52     VM* m_vm;
  53     JSObject* m_object;
  54 };
  55
  56 } // namespace JSC
  57
  58 #endif // BatchedTransitionOptimizer_h