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/*
* Copyright (C) 2021 Apple Inc. All rights reserved.
* Copyright (C) 2021 Igalia S.A. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Structure.h"
#include "Symbol.h"
#include "Watchpoint.h"
#include "WriteBarrierInlines.h"
namespace WTF {
class UniquedStringImpl;
} // namespace WTF
namespace JSC {
class BrandedStructure final : public Structure {
typedef Structure Base;
public:
template<typename CellType, SubspaceAccess>
static IsoSubspace* subspaceFor(VM& vm)
{
return &vm.brandedStructureSpace;
}
ALWAYS_INLINE bool checkBrand(Symbol* brand)
{
UniquedStringImpl* brandUid = &brand->uid();
for (BrandedStructure* currentStructure = this; currentStructure; currentStructure = currentStructure->m_parentBrand.get()) {
if (brandUid == currentStructure->m_brand)
return true;
}
return false;
}
template<typename Visitor>
static void visitAdditionalChildren(JSCell* cell, Visitor& visitor)
{
BrandedStructure* thisObject = jsCast<BrandedStructure*>(cell);
visitor.append(thisObject->m_parentBrand);
}
private:
BrandedStructure(VM&, Structure*, UniquedStringImpl* brand, DeferredStructureTransitionWatchpointFire*);
BrandedStructure(VM&, BrandedStructure*, DeferredStructureTransitionWatchpointFire*);
static Structure* create(VM&, Structure*, UniquedStringImpl* brand, DeferredStructureTransitionWatchpointFire* = nullptr);
void destruct()
{
m_brand = nullptr;
}
RefPtr<UniquedStringImpl> m_brand;
WriteBarrier<BrandedStructure> m_parentBrand;
friend class Structure;
};
} // namespace JSC
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