/* | |
* Copyright (C) 2005, 2007, 2008 Apple Inc. All rights reserved. | |
* | |
* This library is free software; you can redistribute it and/or | |
* modify it under the terms of the GNU Library General Public | |
* License as published by the Free Software Foundation; either | |
* version 2 of the License, or (at your option) any later version. | |
* | |
* This library is distributed in the hope that it will be useful, | |
* but WITHOUT ANY WARRANTY; without even the implied warranty of | |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
* Library General Public License for more details. | |
* | |
* You should have received a copy of the GNU Library General Public License | |
* along with this library; see the file COPYING.LIB. If not, write to | |
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
* Boston, MA 02110-1301, USA. | |
* | |
*/ | |
#ifndef PropertySlot_h | |
#define PropertySlot_h | |
#include "Identifier.h" | |
#include "JSValue.h" | |
#include "Register.h" | |
#include <wtf/Assertions.h> | |
#include <wtf/NotFound.h> | |
namespace JSC { | |
class ExecState; | |
class JSObject; | |
#define JSC_VALUE_SLOT_MARKER 0 | |
#define JSC_REGISTER_SLOT_MARKER reinterpret_cast<GetValueFunc>(1) | |
#define INDEX_GETTER_MARKER reinterpret_cast<GetValueFunc>(2) | |
#define GETTER_FUNCTION_MARKER reinterpret_cast<GetValueFunc>(3) | |
class PropertySlot { | |
public: | |
enum CachedPropertyType { | |
Uncacheable, | |
Getter, | |
Custom, | |
Value | |
}; | |
PropertySlot() | |
: m_cachedPropertyType(Uncacheable) | |
{ | |
clearBase(); | |
clearOffset(); | |
clearValue(); | |
} | |
explicit PropertySlot(const JSValue base) | |
: m_slotBase(base) | |
, m_cachedPropertyType(Uncacheable) | |
{ | |
clearOffset(); | |
clearValue(); | |
} | |
typedef JSValue (*GetValueFunc)(ExecState*, JSValue slotBase, const Identifier&); | |
typedef JSValue (*GetIndexValueFunc)(ExecState*, JSValue slotBase, unsigned); | |
JSValue getValue(ExecState* exec, const Identifier& propertyName) const | |
{ | |
if (m_getValue == JSC_VALUE_SLOT_MARKER) | |
return *m_data.valueSlot; | |
if (m_getValue == JSC_REGISTER_SLOT_MARKER) | |
return (*m_data.registerSlot).jsValue(); | |
if (m_getValue == INDEX_GETTER_MARKER) | |
return m_getIndexValue(exec, slotBase(), index()); | |
if (m_getValue == GETTER_FUNCTION_MARKER) | |
return functionGetter(exec); | |
return m_getValue(exec, slotBase(), propertyName); | |
} | |
JSValue getValue(ExecState* exec, unsigned propertyName) const | |
{ | |
if (m_getValue == JSC_VALUE_SLOT_MARKER) | |
return *m_data.valueSlot; | |
if (m_getValue == JSC_REGISTER_SLOT_MARKER) | |
return (*m_data.registerSlot).jsValue(); | |
if (m_getValue == INDEX_GETTER_MARKER) | |
return m_getIndexValue(exec, m_slotBase, m_data.index); | |
if (m_getValue == GETTER_FUNCTION_MARKER) | |
return functionGetter(exec); | |
return m_getValue(exec, slotBase(), Identifier::from(exec, propertyName)); | |
} | |
CachedPropertyType cachedPropertyType() const { return m_cachedPropertyType; } | |
bool isCacheable() const { return m_cachedPropertyType != Uncacheable; } | |
bool isCacheableValue() const { return m_cachedPropertyType == Value; } | |
size_t cachedOffset() const | |
{ | |
ASSERT(isCacheable()); | |
return m_offset; | |
} | |
void setValueSlot(JSValue* valueSlot) | |
{ | |
ASSERT(valueSlot); | |
clearBase(); | |
clearOffset(); | |
m_getValue = JSC_VALUE_SLOT_MARKER; | |
m_data.valueSlot = valueSlot; | |
} | |
void setValueSlot(JSValue slotBase, JSValue* valueSlot) | |
{ | |
ASSERT(valueSlot); | |
m_getValue = JSC_VALUE_SLOT_MARKER; | |
m_slotBase = slotBase; | |
m_data.valueSlot = valueSlot; | |
} | |
void setValueSlot(JSValue slotBase, JSValue* valueSlot, size_t offset) | |
{ | |
ASSERT(valueSlot); | |
m_getValue = JSC_VALUE_SLOT_MARKER; | |
m_slotBase = slotBase; | |
m_data.valueSlot = valueSlot; | |
m_offset = offset; | |
m_cachedPropertyType = Value; | |
} | |
void setValue(JSValue value) | |
{ | |
ASSERT(value); | |
clearBase(); | |
clearOffset(); | |
m_getValue = JSC_VALUE_SLOT_MARKER; | |
m_value = value; | |
m_data.valueSlot = &m_value; | |
} | |
void setRegisterSlot(Register* registerSlot) | |
{ | |
ASSERT(registerSlot); | |
clearBase(); | |
clearOffset(); | |
m_getValue = JSC_REGISTER_SLOT_MARKER; | |
m_data.registerSlot = registerSlot; | |
} | |
void setCustom(JSValue slotBase, GetValueFunc getValue) | |
{ | |
ASSERT(slotBase); | |
ASSERT(getValue); | |
m_getValue = getValue; | |
m_getIndexValue = 0; | |
m_slotBase = slotBase; | |
} | |
void setCacheableCustom(JSValue slotBase, GetValueFunc getValue) | |
{ | |
ASSERT(slotBase); | |
ASSERT(getValue); | |
m_getValue = getValue; | |
m_getIndexValue = 0; | |
m_slotBase = slotBase; | |
m_cachedPropertyType = Custom; | |
} | |
void setCustomIndex(JSValue slotBase, unsigned index, GetIndexValueFunc getIndexValue) | |
{ | |
ASSERT(slotBase); | |
ASSERT(getIndexValue); | |
m_getValue = INDEX_GETTER_MARKER; | |
m_getIndexValue = getIndexValue; | |
m_slotBase = slotBase; | |
m_data.index = index; | |
} | |
void setGetterSlot(JSObject* getterFunc) | |
{ | |
ASSERT(getterFunc); | |
m_thisValue = m_slotBase; | |
m_getValue = GETTER_FUNCTION_MARKER; | |
m_data.getterFunc = getterFunc; | |
} | |
void setCacheableGetterSlot(JSValue slotBase, JSObject* getterFunc, unsigned offset) | |
{ | |
ASSERT(getterFunc); | |
m_getValue = GETTER_FUNCTION_MARKER; | |
m_thisValue = m_slotBase; | |
m_slotBase = slotBase; | |
m_data.getterFunc = getterFunc; | |
m_offset = offset; | |
m_cachedPropertyType = Getter; | |
} | |
void setUndefined() | |
{ | |
setValue(jsUndefined()); | |
} | |
JSValue slotBase() const | |
{ | |
return m_slotBase; | |
} | |
void setBase(JSValue base) | |
{ | |
ASSERT(m_slotBase); | |
ASSERT(base); | |
m_slotBase = base; | |
} | |
void clearBase() | |
{ | |
#ifndef NDEBUG | |
m_slotBase = JSValue(); | |
#endif | |
} | |
void clearValue() | |
{ | |
#ifndef NDEBUG | |
m_value = JSValue(); | |
#endif | |
} | |
void clearOffset() | |
{ | |
// Clear offset even in release builds, in case this PropertySlot has been used before. | |
// (For other data members, we don't need to clear anything because reuse would meaningfully overwrite them.) | |
m_offset = 0; | |
m_cachedPropertyType = Uncacheable; | |
} | |
unsigned index() const { return m_data.index; } | |
JSValue thisValue() const { return m_thisValue; } | |
GetValueFunc customGetter() const | |
{ | |
ASSERT(m_cachedPropertyType == Custom); | |
return m_getValue; | |
} | |
private: | |
JSValue functionGetter(ExecState*) const; | |
GetValueFunc m_getValue; | |
GetIndexValueFunc m_getIndexValue; | |
JSValue m_slotBase; | |
union { | |
JSObject* getterFunc; | |
JSValue* valueSlot; | |
Register* registerSlot; | |
unsigned index; | |
} m_data; | |
JSValue m_value; | |
JSValue m_thisValue; | |
size_t m_offset; | |
CachedPropertyType m_cachedPropertyType; | |
}; | |
} // namespace JSC | |
#endif // PropertySlot_h |