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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 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