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/*
* Copyright (C) 2014-2022 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. ``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.
*/
#include "config.h"
#include "GetByVariant.h"
#include "CacheableIdentifierInlines.h"
#include "CallLinkStatus.h"
#include "JSFunctionInlines.h"
namespace JSC {
GetByVariant::GetByVariant(CacheableIdentifier identifier, const StructureSet& structureSet, bool viaGlobalProxy, PropertyOffset offset, const ObjectPropertyConditionSet& conditionSet, std::unique_ptr<CallLinkStatus> callLinkStatus, JSFunction* intrinsicFunction, CodePtr<CustomAccessorPtrTag> customAccessorGetter, std::unique_ptr<DOMAttributeAnnotation> domAttribute)
: m_structureSet(structureSet)
, m_conditionSet(conditionSet)
, m_viaGlobalProxy(viaGlobalProxy)
, m_offset(offset)
, m_callLinkStatus(WTFMove(callLinkStatus))
, m_intrinsicFunction(intrinsicFunction)
, m_customAccessorGetter(customAccessorGetter)
, m_domAttribute(WTFMove(domAttribute))
, m_identifier(WTFMove(identifier))
{
if (!structureSet.size()) {
ASSERT(offset == invalidOffset);
ASSERT(conditionSet.isEmpty());
}
if (intrinsicFunction)
ASSERT(intrinsic() != NoIntrinsic);
}
GetByVariant::~GetByVariant() = default;
GetByVariant::GetByVariant(const GetByVariant& other)
: GetByVariant(other.m_identifier)
{
*this = other;
}
GetByVariant& GetByVariant::operator=(const GetByVariant& other)
{
m_identifier = other.m_identifier;
m_structureSet = other.m_structureSet;
m_conditionSet = other.m_conditionSet;
m_viaGlobalProxy = other.m_viaGlobalProxy;
m_offset = other.m_offset;
m_intrinsicFunction = other.m_intrinsicFunction;
m_customAccessorGetter = other.m_customAccessorGetter;
if (other.m_domAttribute)
m_domAttribute = WTF::makeUnique<DOMAttributeAnnotation>(*other.m_domAttribute);
else
m_domAttribute = nullptr;
if (other.m_callLinkStatus)
m_callLinkStatus = makeUnique<CallLinkStatus>(*other.m_callLinkStatus);
else
m_callLinkStatus = nullptr;
return *this;
}
inline bool GetByVariant::canMergeIntrinsicStructures(const GetByVariant& other) const
{
if (m_intrinsicFunction != other.m_intrinsicFunction)
return false;
switch (intrinsic()) {
case TypedArrayByteLengthIntrinsic: {
// We can merge these sets as long as the element size of the two sets is the same.
TypedArrayType thisType = typedArrayType((*m_structureSet.begin())->typeInfo().type());
TypedArrayType otherType = typedArrayType((*other.m_structureSet.begin())->typeInfo().type());
ASSERT(isTypedView(thisType) && isTypedView(otherType));
return logElementSize(thisType) == logElementSize(otherType);
}
default:
return true;
}
RELEASE_ASSERT_NOT_REACHED();
}
bool GetByVariant::attemptToMerge(const GetByVariant& other)
{
if (!!m_identifier != !!other.m_identifier)
return false;
if (m_identifier && (m_identifier != other.m_identifier))
return false;
if (m_viaGlobalProxy != other.m_viaGlobalProxy)
return false;
if (m_offset != other.m_offset)
return false;
if (m_callLinkStatus || other.m_callLinkStatus) {
if (!(m_callLinkStatus && other.m_callLinkStatus))
return false;
}
if (!canMergeIntrinsicStructures(other))
return false;
if (m_customAccessorGetter != other.m_customAccessorGetter)
return false;
if (m_domAttribute || other.m_domAttribute) {
if (!(m_domAttribute && other.m_domAttribute))
return false;
if (*m_domAttribute != *other.m_domAttribute)
return false;
}
if (m_conditionSet.isEmpty() != other.m_conditionSet.isEmpty())
return false;
if (!m_conditionSet.isEmpty()) {
auto mergedConditionSet = m_conditionSet.mergedWith(other.m_conditionSet);
if (!mergedConditionSet.isValid())
return false;
// If this is a hit variant, one slot base should exist. If this is not a hit variant, the slot base is not necessary.
if (!isPropertyUnset() && !mergedConditionSet.hasOneSlotBaseCondition())
return false;
m_conditionSet = mergedConditionSet;
}
m_structureSet.merge(other.m_structureSet);
if (m_callLinkStatus)
m_callLinkStatus->merge(*other.m_callLinkStatus);
return true;
}
template<typename Visitor>
void GetByVariant::visitAggregateImpl(Visitor& visitor)
{
m_identifier.visitAggregate(visitor);
}
DEFINE_VISIT_AGGREGATE(GetByVariant);
template<typename Visitor>
void GetByVariant::markIfCheap(Visitor& visitor)
{
m_structureSet.markIfCheap(visitor);
}
template void GetByVariant::markIfCheap(AbstractSlotVisitor&);
template void GetByVariant::markIfCheap(SlotVisitor&);
bool GetByVariant::finalize(VM& vm)
{
if (!m_structureSet.isStillAlive(vm))
return false;
if (!m_conditionSet.areStillLive(vm))
return false;
if (m_callLinkStatus && !m_callLinkStatus->finalize(vm))
return false;
if (m_intrinsicFunction && !vm.heap.isMarked(m_intrinsicFunction))
return false;
return true;
}
void GetByVariant::dump(PrintStream& out) const
{
dumpInContext(out, nullptr);
}
void GetByVariant::dumpInContext(PrintStream& out, DumpContext* context) const
{
out.print("<");
out.print("id='", m_identifier, "', ");
if (!isSet()) {
out.print("empty>");
return;
}
out.print(inContext(structureSet(), context), ", ", inContext(m_conditionSet, context));
out.print(", viaGlobalProxy = ", viaGlobalProxy());
out.print(", offset = ", offset());
if (m_callLinkStatus)
out.print(", call = ", *m_callLinkStatus);
if (m_intrinsicFunction)
out.print(", intrinsic = ", *m_intrinsicFunction);
if (m_customAccessorGetter)
out.print(", customaccessorgetter = ", RawPointer(m_customAccessorGetter.taggedPtr()));
if (m_domAttribute) {
out.print(", domclass = ", RawPointer(m_domAttribute->classInfo));
if (m_domAttribute->domJIT)
out.print(", domjit = ", RawPointer(m_domAttribute->domJIT));
}
out.print(">");
}
} // namespace JSC
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