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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003-2022 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.
*
*/
#pragma once
#include "JSCast.h"
#include "CallFrame.h"
#include "JSGlobalObject.h"
#include "NullGetterFunction.h"
#include "NullSetterFunction.h"
#include "Structure.h"
namespace JSC {
class JSObject;
// This is an internal value object which stores getter and setter functions
// for a property. Instances of this class have the property that once a getter
// or setter is set to a non-null value, then they cannot be changed. This means
// that if a property holding a GetterSetter reference is constant-inferred and
// that constant is observed to have a non-null setter (or getter) then we can
// constant fold that setter (or getter).
class GetterSetter final : public JSCell {
friend class JIT;
using Base = JSCell;
private:
GetterSetter(VM& vm, JSGlobalObject* globalObject, JSObject* getter, JSObject* setter)
: Base(vm, vm.getterSetterStructure.get())
{
WTF::storeStoreFence();
m_getter.set(vm, this, getter ? getter : globalObject->nullGetterFunction());
m_setter.set(vm, this, setter ? setter : globalObject->nullSetterFunction());
}
public:
static constexpr unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | OverridesPut | StructureIsImmortal;
template<typename CellType, SubspaceAccess>
static GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return &vm.getterSetterSpace();
}
static GetterSetter* create(VM& vm, JSGlobalObject* globalObject, JSObject* getter, JSObject* setter)
{
GetterSetter* getterSetter = new (NotNull, allocateCell<GetterSetter>(vm)) GetterSetter(vm, globalObject, getter, setter);
getterSetter->finishCreation(vm);
return getterSetter;
}
static GetterSetter* create(VM& vm, JSGlobalObject* globalObject, JSValue getter, JSValue setter)
{
ASSERT(getter.isUndefined() || getter.isObject());
ASSERT(setter.isUndefined() || setter.isObject());
JSObject* getterObject { nullptr };
JSObject* setterObject { nullptr };
if (getter.isObject())
getterObject = asObject(getter);
if (setter.isObject())
setterObject = asObject(setter);
return create(vm, globalObject, getterObject, setterObject);
}
DECLARE_VISIT_CHILDREN;
JSObject* getter() const { return m_getter.get(); }
JSObject* getterConcurrently() const
{
JSObject* result = getter();
WTF::dependentLoadLoadFence();
return result;
}
bool isGetterNull() const { return !!jsDynamicCast<NullGetterFunction*>(m_getter.get()); }
bool isSetterNull() const { return !!jsDynamicCast<NullSetterFunction*>(m_setter.get()); }
JSObject* setter() const { return m_setter.get(); }
JSObject* setterConcurrently() const
{
JSObject* result = setter();
WTF::loadLoadFence();
return result;
}
JSValue callGetter(JSGlobalObject*, JSValue thisValue);
bool callSetter(JSGlobalObject*, JSValue thisValue, JSValue, bool shouldThrow);
inline static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
static constexpr ptrdiff_t offsetOfGetter()
{
return OBJECT_OFFSETOF(GetterSetter, m_getter);
}
static constexpr ptrdiff_t offsetOfSetter()
{
return OBJECT_OFFSETOF(GetterSetter, m_setter);
}
DECLARE_EXPORT_INFO;
static bool getOwnPropertySlot(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&) { RELEASE_ASSERT_NOT_REACHED(); return false; }
static bool put(JSCell*, JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&) { RELEASE_ASSERT_NOT_REACHED(); return false; }
static bool putByIndex(JSCell*, JSGlobalObject*, unsigned, JSValue, bool) { RELEASE_ASSERT_NOT_REACHED(); return false; }
static bool setPrototype(JSObject*, JSGlobalObject*, JSValue, bool) { RELEASE_ASSERT_NOT_REACHED(); return false; }
static bool defineOwnProperty(JSObject*, JSGlobalObject*, PropertyName, const PropertyDescriptor&, bool) { RELEASE_ASSERT_NOT_REACHED(); return false; }
static bool deleteProperty(JSCell*, JSGlobalObject*, PropertyName, DeletePropertySlot&) { RELEASE_ASSERT_NOT_REACHED(); return false; }
private:
WriteBarrier<JSObject> m_getter;
WriteBarrier<JSObject> m_setter;
};
} // namespace JSC
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