/*
 * Copyright (C) 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.
 */

#pragma once

#include "ObjectPropertyCondition.h"
#include "PackedCellPtr.h"
#include "Watchpoint.h"

namespace JSC {

class ObjectAdaptiveStructureWatchpoint final : public Watchpoint {
public:
    ObjectAdaptiveStructureWatchpoint(JSCell* owner, const ObjectPropertyCondition& key, InlineWatchpointSet& watchpointSet)
        : Watchpoint(Watchpoint::Type::ObjectAdaptiveStructure)
        , m_owner(owner)
        , m_key(key)
        , m_watchpointSet(watchpointSet)
    {
        RELEASE_ASSERT(key.kind() != PropertyCondition::Equivalence);
        RELEASE_ASSERT(key.watchingRequiresStructureTransitionWatchpoint());
        RELEASE_ASSERT(!key.watchingRequiresReplacementWatchpoint());
        RELEASE_ASSERT(watchpointSet.state() == IsWatched);
    }

    const ObjectPropertyCondition& key() const { return m_key; }

    void install(VM&);

    void fireInternal(VM&, const FireDetail&);

private:
    // Own destructor may not be called. Keep members trivially destructible.
    PackedCellPtr<JSCell> m_owner;
    ObjectPropertyCondition m_key;
    InlineWatchpointSet& m_watchpointSet;
};

inline void ObjectAdaptiveStructureWatchpoint::install(VM&)
{
    RELEASE_ASSERT(m_key.isWatchable(PropertyCondition::MakeNoChanges));

    m_key.object()->structure()->addTransitionWatchpoint(this);
}

inline void ObjectAdaptiveStructureWatchpoint::fireInternal(VM& vm, const FireDetail&)
{
    if (!m_owner->isLive())
        return;

    if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
        install(vm);
        return;
    }

    m_watchpointSet.fireAll(vm, StringFireDetail("Object Property is added."));
}

} // namespace JSC
