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/*
* Copyright (C) 2015-2023 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 "AdaptiveInferredPropertyValueWatchpointBase.h"
#include "JSCInlines.h"
#include <wtf/TZoneMallocInlines.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
WTF_MAKE_TZONE_ALLOCATED_IMPL(AdaptiveInferredPropertyValueWatchpointBase);
AdaptiveInferredPropertyValueWatchpointBase::AdaptiveInferredPropertyValueWatchpointBase(const ObjectPropertyCondition& key)
: m_key(key)
{
RELEASE_ASSERT(key.kind() == PropertyCondition::Equivalence);
}
void AdaptiveInferredPropertyValueWatchpointBase::initialize(const ObjectPropertyCondition& key)
{
m_key = key;
RELEASE_ASSERT(key.kind() == PropertyCondition::Equivalence);
}
void AdaptiveInferredPropertyValueWatchpointBase::install(VM& vm)
{
ASSERT(m_key.isWatchable(PropertyCondition::MakeNoChanges)); // This is really costly.
Structure* structure = m_key.object()->structure();
structure->addTransitionWatchpoint(&m_structureWatchpoint);
PropertyOffset offset = structure->get(vm, m_key.uid());
WatchpointSet* set = structure->propertyReplacementWatchpointSet(offset);
set->add(&m_propertyWatchpoint);
}
void AdaptiveInferredPropertyValueWatchpointBase::fire(VM& vm, const FireDetail& detail)
{
// One of the watchpoints fired, but the other one didn't. Make sure that neither of them are
// in any set anymore. This simplifies things by allowing us to reinstall the watchpoints
// wherever from scratch.
if (m_structureWatchpoint.isOnList())
m_structureWatchpoint.remove();
if (m_propertyWatchpoint.isOnList())
m_propertyWatchpoint.remove();
if (!isValid())
return;
if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
install(vm);
return;
}
handleFire(vm, detail);
}
bool AdaptiveInferredPropertyValueWatchpointBase::isValid() const
{
return true;
}
void AdaptiveInferredPropertyValueWatchpointBase::StructureWatchpoint::fireInternal(VM& vm, const FireDetail& detail)
{
ptrdiff_t myOffset = OBJECT_OFFSETOF(AdaptiveInferredPropertyValueWatchpointBase, m_structureWatchpoint);
AdaptiveInferredPropertyValueWatchpointBase* parent = std::bit_cast<AdaptiveInferredPropertyValueWatchpointBase*>(std::bit_cast<char*>(this) - myOffset);
parent->fire(vm, detail);
}
void AdaptiveInferredPropertyValueWatchpointBase::PropertyWatchpoint::fireInternal(VM& vm, const FireDetail& detail)
{
ptrdiff_t myOffset = OBJECT_OFFSETOF(AdaptiveInferredPropertyValueWatchpointBase, m_propertyWatchpoint);
AdaptiveInferredPropertyValueWatchpointBase* parent = std::bit_cast<AdaptiveInferredPropertyValueWatchpointBase*>(std::bit_cast<char*>(this) - myOffset);
parent->fire(vm, detail);
}
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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