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/*
* Copyright (C) 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 <wtf/HashMap.h>
#include <wtf/Locker.h>
#include <wtf/NeverDestroyed.h>
namespace JSC {
class SideDataRepository {
public:
class SideData {
WTF_MAKE_FAST_ALLOCATED;
public:
virtual ~SideData() = default;
};
template<typename Type, typename Functor>
Type& ensure(void* owner, void* key, const Functor& functor)
{
static_assert(std::is_base_of_v<SideData, Type>);
Locker lock { m_lock };
auto result = add(owner, key, nullptr);
if (result.isNewEntry)
result.iterator->value = functor();
return *reinterpret_cast<Type*>(result.iterator->value.get());
}
void deleteAll(void* owner);
protected:
using KeyValueStore = UncheckedKeyHashMap<void*, std::unique_ptr<SideData>>;
using AddResult = KeyValueStore::AddResult;
SideDataRepository() = default;
JS_EXPORT_PRIVATE AddResult add(void* owner, void* key, std::unique_ptr<SideData>) WTF_REQUIRES_LOCK(m_lock);
UncheckedKeyHashMap<void*, KeyValueStore> m_ownerStore WTF_GUARDED_BY_LOCK(m_lock);
Lock m_lock;
friend class LazyNeverDestroyed<SideDataRepository>;
};
JS_EXPORT_PRIVATE SideDataRepository& sideDataRepository();
} // namespace JSC
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