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/*
* Copyright (C) 2014-2023 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.
*/
#pragma once
#include "CacheableIdentifier.h"
#include "CallLinkStatus.h"
#include "ObjectPropertyConditionSet.h"
#include "PropertyOffset.h"
#include "StructureSet.h"
#include <wtf/TZoneMalloc.h>
namespace JSC {
class PutByVariant {
WTF_MAKE_TZONE_ALLOCATED(PutByVariant);
public:
enum Kind {
NotSet,
Replace,
Transition,
Setter,
CustomAccessorSetter,
Proxy,
};
PutByVariant(CacheableIdentifier identifier)
: m_kind(NotSet)
, m_offset(invalidOffset)
, m_newStructure(nullptr)
, m_identifier(WTFMove(identifier))
{
}
PutByVariant(const PutByVariant&);
PutByVariant& operator=(const PutByVariant&);
static PutByVariant replace(CacheableIdentifier, const StructureSet&, PropertyOffset, bool viaGlobalProxy);
static PutByVariant transition(CacheableIdentifier, const StructureSet& oldStructure, Structure* newStructure, const ObjectPropertyConditionSet&, PropertyOffset);
static PutByVariant setter(CacheableIdentifier, const StructureSet&, PropertyOffset, bool viaGlobalProxy, const ObjectPropertyConditionSet&, std::unique_ptr<CallLinkStatus>);
static PutByVariant customSetter(CacheableIdentifier, const StructureSet&, bool viaGlobalProxy, const ObjectPropertyConditionSet&, CodePtr<CustomAccessorPtrTag>, std::unique_ptr<DOMAttributeAnnotation>&&);
static PutByVariant proxy(CacheableIdentifier, const StructureSet&, std::unique_ptr<CallLinkStatus>);
Kind kind() const { return m_kind; }
bool isSet() const { return kind() != NotSet; }
bool operator!() const { return !isSet(); }
const StructureSet& structure() const
{
ASSERT(kind() == Replace || kind() == Setter || kind() == Proxy || kind() == CustomAccessorSetter);
return m_oldStructure;
}
const StructureSet& oldStructure() const
{
ASSERT(kind() == Transition || kind() == Replace || kind() == Setter || kind() == CustomAccessorSetter || kind() == Proxy);
return m_oldStructure;
}
const StructureSet& structureSet() const
{
return oldStructure();
}
StructureSet& oldStructure()
{
ASSERT(kind() == Transition || kind() == Replace || kind() == Setter || kind() == CustomAccessorSetter || kind() == Proxy);
return m_oldStructure;
}
StructureSet& structureSet()
{
return oldStructure();
}
Structure* oldStructureForTransition() const;
Structure* newStructure() const
{
ASSERT(kind() == Transition);
return m_newStructure;
}
void fixTransitionToReplaceIfNecessary();
bool writesStructures() const;
bool reallocatesStorage() const;
bool makesCalls() const;
const ObjectPropertyConditionSet& conditionSet() const { return m_conditionSet; }
// We don't support intrinsics for Setters (it would be sweet if we did) but we need this for templated helpers.
Intrinsic intrinsic() const { return NoIntrinsic; }
// This is needed for templated helpers.
bool isPropertyUnset() const { return false; }
PropertyOffset offset() const
{
ASSERT(isSet());
return m_offset;
}
CallLinkStatus* callLinkStatus() const
{
ASSERT(kind() == Setter || kind() == Proxy);
return m_callLinkStatus.get();
}
bool attemptToMerge(const PutByVariant& other);
DECLARE_VISIT_AGGREGATE;
template<typename Visitor> void markIfCheap(Visitor&);
bool finalize(VM&);
void dump(PrintStream&) const;
void dumpInContext(PrintStream&, DumpContext*) const;
CacheableIdentifier identifier() const { return m_identifier; }
bool overlaps(const PutByVariant& other)
{
if (m_viaGlobalProxy != other.m_viaGlobalProxy)
return true;
if (!!m_identifier != !!other.m_identifier)
return true;
if (m_identifier) {
if (m_identifier != other.m_identifier)
return false;
}
return structureSet().overlaps(other.structureSet());
}
bool viaGlobalProxy() const { return m_viaGlobalProxy; }
CodePtr<CustomAccessorPtrTag> customAccessorSetter() const { return m_customAccessorSetter; }
DOMAttributeAnnotation* domAttribute() const { return m_domAttribute.get(); }
private:
bool attemptToMergeTransitionWithReplace(const PutByVariant& replace);
Kind m_kind;
bool m_viaGlobalProxy { false };
PropertyOffset m_offset { invalidOffset };
StructureSet m_oldStructure;
Structure* m_newStructure { nullptr };
ObjectPropertyConditionSet m_conditionSet;
std::unique_ptr<CallLinkStatus> m_callLinkStatus;
CodePtr<CustomAccessorPtrTag> m_customAccessorSetter;
std::unique_ptr<DOMAttributeAnnotation> m_domAttribute;
CacheableIdentifier m_identifier;
};
} // namespace JSC
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