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      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 COMPUTER, 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 COMPUTER, 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 PutPropertySlot_h
     28 #define PutPropertySlot_h
     29 
     30 #include <wtf/Assertions.h>
     31 
     32 namespace JSC {
     33 
     34     class JSObject;
     35     class JSFunction;
     36 
     37     class PutPropertySlot {
     38     public:
     39         enum Type { Uncachable, ExistingProperty, NewProperty };
     40 
     41         PutPropertySlot()
     42             : m_type(Uncachable)
     43             , m_base(0)
     44         {
     45         }
     46 
     47         void setExistingProperty(JSObject* base, size_t offset)
     48         {
     49             m_type = ExistingProperty;
     50             m_base = base;
     51             m_offset = offset;
     52         }
     53 
     54         void setNewProperty(JSObject* base, size_t offset)
     55         {
     56             m_type = NewProperty;
     57             m_base = base;
     58             m_offset = offset;
     59         }
     60 
     61         Type type() const { return m_type; }
     62         JSObject* base() const { return m_base; }
     63 
     64         bool isCacheable() const { return m_type != Uncachable; }
     65         size_t cachedOffset() const {
     66             ASSERT(isCacheable());
     67             return m_offset;
     68         }
     69     private:
     70         Type m_type;
     71         JSObject* m_base;
     72         size_t m_offset;
     73     };
     74 
     75 } // namespace JSC
     76 
     77 #endif // PutPropertySlot_h
     78