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/*
* Copyright (C) 2014-2019 Apple Inc. 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#include "config.h"
#include "JSPropertyNameEnumerator.h"
#include "JSObjectInlines.h"
namespace JSC {
const ClassInfo JSPropertyNameEnumerator::s_info = { "JSPropertyNameEnumerator", nullptr, nullptr, nullptr, CREATE_METHOD_TABLE(JSPropertyNameEnumerator) };
JSPropertyNameEnumerator* JSPropertyNameEnumerator::create(VM& vm, Structure* structure, uint32_t indexedLength, uint32_t numberStructureProperties, PropertyNameArray&& propertyNames)
{
unsigned propertyNamesSize = propertyNames.size();
unsigned propertyNamesBufferSizeInBytes = (Checked<unsigned>(propertyNamesSize) * sizeof(WriteBarrier<JSString>)).unsafeGet();
WriteBarrier<JSString>* propertyNamesBuffer = nullptr;
if (propertyNamesBufferSizeInBytes) {
propertyNamesBuffer = static_cast<WriteBarrier<JSString>*>(vm.jsValueGigacageAuxiliarySpace.allocateNonVirtual(vm, propertyNamesBufferSizeInBytes, nullptr, AllocationFailureMode::Assert));
for (unsigned i = 0; i < propertyNamesSize; ++i)
propertyNamesBuffer[i].clear();
}
JSPropertyNameEnumerator* enumerator = new (NotNull, allocateCell<JSPropertyNameEnumerator>(vm.heap)) JSPropertyNameEnumerator(vm, structure, indexedLength, numberStructureProperties, propertyNamesBuffer, propertyNamesSize);
enumerator->finishCreation(vm, propertyNames.releaseData());
return enumerator;
}
JSPropertyNameEnumerator::JSPropertyNameEnumerator(VM& vm, Structure* structure, uint32_t indexedLength, uint32_t numberStructureProperties, WriteBarrier<JSString>* propertyNamesBuffer, unsigned propertyNamesSize)
: JSCell(vm, vm.propertyNameEnumeratorStructure.get())
, m_propertyNames(vm, this, propertyNamesBuffer)
, m_cachedStructureID(structure ? structure->id() : 0)
, m_indexedLength(indexedLength)
, m_endStructurePropertyIndex(numberStructureProperties)
, m_endGenericPropertyIndex(propertyNamesSize)
, m_cachedInlineCapacity(structure ? structure->inlineCapacity() : 0)
{
}
void JSPropertyNameEnumerator::finishCreation(VM& vm, RefPtr<PropertyNameArrayData>&& identifiers)
{
Base::finishCreation(vm);
PropertyNameArrayData::PropertyNameVector& vector = identifiers->propertyNameVector();
ASSERT(m_endGenericPropertyIndex == vector.size());
for (unsigned i = 0; i < vector.size(); ++i) {
const Identifier& identifier = vector[i];
m_propertyNames.get()[i].set(vm, this, jsString(vm, identifier.string()));
}
}
void JSPropertyNameEnumerator::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSPropertyNameEnumerator* thisObject = jsCast<JSPropertyNameEnumerator*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(cell, visitor);
if (auto* propertyNames = thisObject->m_propertyNames.get()) {
visitor.markAuxiliary(propertyNames);
visitor.append(propertyNames, propertyNames + thisObject->sizeOfPropertyNames());
}
visitor.append(thisObject->m_prototypeChain);
if (thisObject->cachedStructureID()) {
VM& vm = visitor.vm();
visitor.appendUnbarriered(vm.getStructure(thisObject->cachedStructureID()));
}
}
} // namespace JSC