Source/JavaScriptCore/runtime/BrandedStructure.cpp

/*
 * 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
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#include "config.h"
#include "BrandedStructure.h"

#include "JSCInlines.h"

namespace JSC {

BrandedStructure::BrandedStructure(VM& vm, Structure* previous, UniquedStringImpl* brandUid, DeferredStructureTransitionWatchpointFire* deferred)
    : Structure(vm, previous, deferred)
    , m_brand(brandUid)
{
    if (previous->isBrandedStructure())
        m_parentBrand.set(vm, this, jsCast<BrandedStructure*>(previous));
    this->setIsBrandedStructure(true);
}

BrandedStructure::BrandedStructure(VM& vm, BrandedStructure* previous, DeferredStructureTransitionWatchpointFire* deferred)
    : Structure(vm, previous, deferred)
    , m_brand(previous->m_brand)
    , m_parentBrand(vm, this, previous->m_parentBrand.get(), WriteBarrier<BrandedStructure>::MayBeNull)
{
    this->setIsBrandedStructure(true);
}

Structure* BrandedStructure::create(VM& vm, Structure* previous, UniquedStringImpl* brandUid, DeferredStructureTransitionWatchpointFire* deferred)
{
    ASSERT(vm.structureStructure);
    BrandedStructure* newStructure = new (NotNull, allocateCell<BrandedStructure>(vm.heap)) BrandedStructure(vm, previous, brandUid, deferred);
    newStructure->finishCreation(vm, previous);
    ASSERT(newStructure->type() == StructureType);
    return newStructure;
}

} // namespace JSC