Source/JavaScriptCore/runtime/LazyClassStructure.cpp

/*
 * Copyright (C) 2016-2021 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
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 * 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 ITS CONTRIBUTORS
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#include "config.h"
#include "LazyClassStructure.h"

#include "JSCInlines.h"
#include "LazyPropertyInlines.h"

namespace JSC {

LazyClassStructure::Initializer::Initializer(VM& vm, JSGlobalObject* global, LazyClassStructure& classStructure, const StructureInitializer& structureInit)
    : vm(vm)
    , global(global)
    , classStructure(classStructure)
    , structureInit(structureInit)
{
}

void LazyClassStructure::Initializer::setPrototype(JSObject* prototype)
{
    RELEASE_ASSERT(!this->prototype);
    RELEASE_ASSERT(!structure);
    RELEASE_ASSERT(!constructor);
    
    this->prototype = prototype;
}

void LazyClassStructure::Initializer::setStructure(Structure* structure)
{
    RELEASE_ASSERT(!this->structure);
    RELEASE_ASSERT(!constructor);

    this->structure = structure;
    structureInit.set(structure);
    
    if (!prototype)
        prototype = structure->storedPrototypeObject();
}

void LazyClassStructure::Initializer::setConstructor(JSObject* constructor)
{
    RELEASE_ASSERT(structure);
    RELEASE_ASSERT(prototype);
    RELEASE_ASSERT(!this->constructor);
    
    this->constructor = constructor;

    prototype->putDirectWithoutTransition(vm, vm.propertyNames->constructor, constructor, static_cast<unsigned>(PropertyAttribute::DontEnum));
    classStructure.m_constructor.set(vm, global, constructor);
}

template<typename Visitor>
void LazyClassStructure::visit(Visitor& visitor)
{
    m_structure.visit(visitor);
    visitor.append(m_constructor);
}

template void LazyClassStructure::visit(AbstractSlotVisitor&);
template void LazyClassStructure::visit(SlotVisitor&);

void LazyClassStructure::dump(PrintStream& out) const
{
    out.print("<structure = ", m_structure, ", constructor = ", RawPointer(m_constructor.get()), ">");
}

} // namespace JSC