GetByIdVariant.cpp [plain text]
#include "config.h"
#include "GetByIdVariant.h"
#include "CallLinkStatus.h"
#include "JSCInlines.h"
#include <wtf/ListDump.h>
namespace JSC {
GetByIdVariant::GetByIdVariant(
const StructureSet& structureSet, PropertyOffset offset,
const ObjectPropertyConditionSet& conditionSet,
std::unique_ptr<CallLinkStatus> callLinkStatus,
JSFunction* intrinsicFunction)
: m_structureSet(structureSet)
, m_conditionSet(conditionSet)
, m_offset(offset)
, m_callLinkStatus(WTFMove(callLinkStatus))
, m_intrinsicFunction(intrinsicFunction)
{
if (!structureSet.size()) {
ASSERT(offset == invalidOffset);
ASSERT(conditionSet.isEmpty());
}
if (intrinsicFunction)
ASSERT(intrinsic() != NoIntrinsic);
}
GetByIdVariant::~GetByIdVariant() { }
GetByIdVariant::GetByIdVariant(const GetByIdVariant& other)
: GetByIdVariant()
{
*this = other;
}
GetByIdVariant& GetByIdVariant::operator=(const GetByIdVariant& other)
{
m_structureSet = other.m_structureSet;
m_conditionSet = other.m_conditionSet;
m_offset = other.m_offset;
m_intrinsicFunction = other.m_intrinsicFunction;
if (other.m_callLinkStatus)
m_callLinkStatus = std::make_unique<CallLinkStatus>(*other.m_callLinkStatus);
else
m_callLinkStatus = nullptr;
return *this;
}
inline bool GetByIdVariant::canMergeIntrinsicStructures(const GetByIdVariant& other) const
{
if (m_intrinsicFunction != other.m_intrinsicFunction)
return false;
switch (intrinsic()) {
case TypedArrayByteLengthIntrinsic: {
TypedArrayType thisType = (*m_structureSet.begin())->classInfo()->typedArrayStorageType;
TypedArrayType otherType = (*other.m_structureSet.begin())->classInfo()->typedArrayStorageType;
ASSERT(isTypedView(thisType) && isTypedView(otherType));
return logElementSize(thisType) == logElementSize(otherType);
}
default:
return true;
}
RELEASE_ASSERT_NOT_REACHED();
}
bool GetByIdVariant::attemptToMerge(const GetByIdVariant& other)
{
if (m_offset != other.m_offset)
return false;
if (m_callLinkStatus || other.m_callLinkStatus)
return false;
if (!canMergeIntrinsicStructures(other))
return false;
if (m_conditionSet.isEmpty() != other.m_conditionSet.isEmpty())
return false;
ObjectPropertyConditionSet mergedConditionSet;
if (!m_conditionSet.isEmpty()) {
mergedConditionSet = m_conditionSet.mergedWith(other.m_conditionSet);
if (!mergedConditionSet.isValid() || !mergedConditionSet.hasOneSlotBaseCondition())
return false;
}
m_conditionSet = mergedConditionSet;
m_structureSet.merge(other.m_structureSet);
return true;
}
void GetByIdVariant::dump(PrintStream& out) const
{
dumpInContext(out, 0);
}
void GetByIdVariant::dumpInContext(PrintStream& out, DumpContext* context) const
{
if (!isSet()) {
out.print("<empty>");
return;
}
out.print(
"<", inContext(structureSet(), context), ", ", inContext(m_conditionSet, context));
out.print(", offset = ", offset());
if (m_callLinkStatus)
out.print(", call = ", *m_callLinkStatus);
if (m_intrinsicFunction)
out.print(", intrinsic = ", *m_intrinsicFunction);
out.print(">");
}
}