Source/WebCore/page/OriginThreadLocalCache.cpp

/*
 * Copyright (C) 2018 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 "OriginThreadLocalCache.h"

#include "CommonVM.h"
#include "SecurityOriginHash.h"
#include <wtf/HashMap.h>
#include <wtf/NeverDestroyed.h>

namespace WebCore {

typedef HashMap<RefPtr<SecurityOrigin>, OriginThreadLocalCache*> ThreadLocalCacheMap;

static ThreadLocalCacheMap& threadLocalCacheMap()
{
    static NeverDestroyed<ThreadLocalCacheMap> map;
    return map;
}

Ref<OriginThreadLocalCache> OriginThreadLocalCache::create(SecurityOrigin& key)
{
    auto iter = threadLocalCacheMap().find(&key);
    if (iter != threadLocalCacheMap().end())
        return *iter->value;
    
    return adoptRef(*new OriginThreadLocalCache(key));
}

OriginThreadLocalCache::~OriginThreadLocalCache()
{
    bool result = threadLocalCacheMap().remove(m_key);
    RELEASE_ASSERT(result);
}

OriginThreadLocalCache::OriginThreadLocalCache(SecurityOrigin& key)
    : ThreadLocalCache(commonVM().heap, JSC::uniqueSecurityOriginToken())
    , m_key(&key)
{
    auto result = threadLocalCacheMap().add(&key, this);
    RELEASE_ASSERT(result);
}

} // namespace WebCore