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