runtime/PutPropertySlot.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 PutPropertySlot_h
  28 #define PutPropertySlot_h
  29
  30 #include "JSCJSValue.h"
  31
  32 #include <wtf/Assertions.h>
  33
  34 namespace JSC {
  35
  36     class JSObject;
  37     class JSFunction;
  38
  39     class PutPropertySlot {
  40     public:
  41         enum Type { Uncachable, ExistingProperty, NewProperty, SetterProperty, CustomProperty };
  42         enum Context { UnknownContext, PutById, PutByIdEval };
  43         typedef void (*PutValueFunc)(ExecState*, JSObject* base, EncodedJSValue thisObject, EncodedJSValue value);
  44
  45         PutPropertySlot(JSValue thisValue, bool isStrictMode = false, Context context = UnknownContext)
  46             : m_type(Uncachable)
  47             , m_base(0)
  48             , m_thisValue(thisValue)
  49             , m_isStrictMode(isStrictMode)
  50             , m_context(context)
  51             , m_putFunction(nullptr)
  52         {
  53         }
  54
  55         void setExistingProperty(JSObject* base, PropertyOffset offset)
  56         {
  57             m_type = ExistingProperty;
  58             m_base = base;
  59             m_offset = offset;
  60         }
  61
  62         void setNewProperty(JSObject* base, PropertyOffset offset)
  63         {
  64             m_type = NewProperty;
  65             m_base = base;
  66             m_offset = offset;
  67         }
  68
  69         void setCustomProperty(JSObject* base, PutValueFunc function)
  70         {
  71             m_type = CustomProperty;
  72             m_base = base;
  73             m_putFunction = function;
  74         }
  75
  76         void setCacheableSetter(JSObject* base, PropertyOffset offset)
  77         {
  78             m_type = SetterProperty;
  79             m_base = base;
  80             m_offset = offset;
  81         }
  82
  83         PutValueFunc customSetter() const { return m_putFunction; }
  84
  85         Context context() const { return static_cast<Context>(m_context); }
  86
  87         Type type() const { return m_type; }
  88         JSObject* base() const { return m_base; }
  89         JSValue thisValue() const { return m_thisValue; }
  90
  91         bool isStrictMode() const { return m_isStrictMode; }
  92         bool isCacheablePut() const { return m_type == NewProperty || m_type == ExistingProperty; }
  93         bool isCacheableSetter() const { return m_type == SetterProperty; }
  94         bool isCacheableCustom() const { return m_type == CustomProperty; }
  95
  96         PropertyOffset cachedOffset() const
  97         {
  98             return m_offset;
  99         }
 100
 101     private:
 102         Type m_type;
 103         JSObject* m_base;
 104         JSValue m_thisValue;
 105         PropertyOffset m_offset;
 106         bool m_isStrictMode;
 107         uint8_t m_context;
 108         PutValueFunc m_putFunction;
 109
 110     };
 111
 112 } // namespace JSC
 113
 114 #endif // PutPropertySlot_h