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/*
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* Copyright (C) 2005, 2007, 2008 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef PropertySlot_h
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#define PropertySlot_h
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#include "Identifier.h"
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#include "JSValue.h"
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#include "Register.h"
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#include <wtf/Assertions.h>
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#include <wtf/NotFound.h>
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namespace JSC {
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class ExecState;
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class JSObject;
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#define JSC_VALUE_SLOT_MARKER 0
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#define JSC_REGISTER_SLOT_MARKER reinterpret_cast<GetValueFunc>(1)
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class PropertySlot {
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public:
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PropertySlot()
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{
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clearBase();
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clearOffset();
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clearValue();
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}
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explicit PropertySlot(const JSValue base)
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: m_slotBase(base)
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{
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clearOffset();
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clearValue();
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}
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typedef JSValue (*GetValueFunc)(ExecState*, const Identifier&, const PropertySlot&);
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JSValue getValue(ExecState* exec, const Identifier& propertyName) const
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{
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if (m_getValue == JSC_VALUE_SLOT_MARKER)
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return *m_data.valueSlot;
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if (m_getValue == JSC_REGISTER_SLOT_MARKER)
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return (*m_data.registerSlot).jsValue();
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return m_getValue(exec, propertyName, *this);
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}
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JSValue getValue(ExecState* exec, unsigned propertyName) const
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{
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if (m_getValue == JSC_VALUE_SLOT_MARKER)
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return *m_data.valueSlot;
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if (m_getValue == JSC_REGISTER_SLOT_MARKER)
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return (*m_data.registerSlot).jsValue();
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return m_getValue(exec, Identifier::from(exec, propertyName), *this);
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}
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bool isCacheable() const { return m_offset != WTF::notFound; }
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size_t cachedOffset() const
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{
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ASSERT(isCacheable());
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return m_offset;
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}
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void setValueSlot(JSValue* valueSlot)
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{
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ASSERT(valueSlot);
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clearBase();
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clearOffset();
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m_getValue = JSC_VALUE_SLOT_MARKER;
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m_data.valueSlot = valueSlot;
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}
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void setValueSlot(JSValue slotBase, JSValue* valueSlot)
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{
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ASSERT(valueSlot);
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m_getValue = JSC_VALUE_SLOT_MARKER;
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m_slotBase = slotBase;
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m_data.valueSlot = valueSlot;
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}
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void setValueSlot(JSValue slotBase, JSValue* valueSlot, size_t offset)
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{
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ASSERT(valueSlot);
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m_getValue = JSC_VALUE_SLOT_MARKER;
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m_slotBase = slotBase;
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m_data.valueSlot = valueSlot;
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m_offset = offset;
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}
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void setValue(JSValue value)
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{
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ASSERT(value);
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clearBase();
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clearOffset();
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m_getValue = JSC_VALUE_SLOT_MARKER;
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m_value = value;
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m_data.valueSlot = &m_value;
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}
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void setRegisterSlot(Register* registerSlot)
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{
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ASSERT(registerSlot);
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clearBase();
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clearOffset();
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m_getValue = JSC_REGISTER_SLOT_MARKER;
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m_data.registerSlot = registerSlot;
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}
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void setCustom(JSValue slotBase, GetValueFunc getValue)
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{
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ASSERT(slotBase);
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ASSERT(getValue);
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m_getValue = getValue;
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m_slotBase = slotBase;
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}
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void setCustomIndex(JSValue slotBase, unsigned index, GetValueFunc getValue)
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{
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ASSERT(slotBase);
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ASSERT(getValue);
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m_getValue = getValue;
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m_slotBase = slotBase;
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m_data.index = index;
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}
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void setGetterSlot(JSObject* getterFunc)
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{
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ASSERT(getterFunc);
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m_getValue = functionGetter;
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m_data.getterFunc = getterFunc;
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}
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void setUndefined()
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{
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setValue(jsUndefined());
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}
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JSValue slotBase() const
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{
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return m_slotBase;
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}
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void setBase(JSValue base)
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{
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ASSERT(m_slotBase);
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ASSERT(base);
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m_slotBase = base;
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}
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void clearBase()
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{
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#ifndef NDEBUG
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m_slotBase = JSValue();
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#endif
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}
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void clearValue()
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{
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#ifndef NDEBUG
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m_value = JSValue();
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#endif
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}
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void clearOffset()
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{
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// Clear offset even in release builds, in case this PropertySlot has been used before.
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// (For other data members, we don't need to clear anything because reuse would meaningfully overwrite them.)
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m_offset = WTF::notFound;
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}
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unsigned index() const { return m_data.index; }
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private:
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static JSValue functionGetter(ExecState*, const Identifier&, const PropertySlot&);
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GetValueFunc m_getValue;
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JSValue m_slotBase;
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union {
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JSObject* getterFunc;
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JSValue* valueSlot;
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Register* registerSlot;
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unsigned index;
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} m_data;
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JSValue m_value;
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size_t m_offset;
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};
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} // namespace JSC
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#endif // PropertySlot_h
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