Source/JavaScriptCore/runtime/WeakMapImplInlines.h

/*
 * Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>.
 *
 * 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 "WeakMapImpl.h"

namespace JSC {

// Note that this function can be executed in parallel as long as the mutator stops.
template<typename WeakMapBucket>
void WeakMapImpl<WeakMapBucket>::finalizeUnconditionally(VM&)
{
    auto* buffer = this->buffer();
    for (uint32_t index = 0; index < m_capacity; ++index) {
        auto* bucket = buffer + index;
        if (bucket->isEmpty() || bucket->isDeleted())
            continue;

        if (Heap::isMarked(bucket->key()))
            continue;

        bucket->makeDeleted();
        ++m_deleteCount;
        RELEASE_ASSERT(m_keyCount > 0);
        --m_keyCount;
    }

    if (shouldShrink())
        rehash(RehashMode::RemoveBatching);
}

}