/*
 * Copyright (C) 2016-2017 Apple Inc. All rights reserved.
 * Copyright (C) 2018 Yusuke Suzuki <yusukesuzuki@slowstart.org>.
 *
 * 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/Platform.h>

#if ENABLE(WEBASSEMBLY)

#include <JavaScriptCore/WasmTypeDefinition.h>

namespace JSC { namespace Wasm {

inline TypeInformation& TypeInformation::singleton()
{
    static TypeInformation* theOne;
    static std::once_flag typeInformationFlag;

    std::call_once(typeInformationFlag, [] () {
        theOne = new TypeInformation;
    });
    return *theOne;
}

inline TypeIndex TypeDefinition::index() const
{
    ASSERT(refCount() > 1); // TypeInformation::m_typeSet + caller
    return std::bit_cast<TypeIndex>(this);
}

inline const TypeDefinition& TypeInformation::get(TypeIndex index)
{
    ASSERT(index != TypeDefinition::invalidIndex);
    auto def = std::bit_cast<const TypeDefinition*>(index);
    ASSERT(def->refCount() > 1); // TypeInformation::m_typeSet + caller
    return *def;
}

inline const FunctionSignature& TypeInformation::getFunctionSignature(TypeIndex index)
{
    const TypeDefinition& signature = get(index).expand();
    ASSERT(signature.is<FunctionSignature>());
    return *signature.as<FunctionSignature>();
}

inline std::optional<const FunctionSignature*> TypeInformation::tryGetFunctionSignature(TypeIndex index)
{
    const TypeDefinition& signature = get(index).expand();
    if (signature.is<FunctionSignature>())
        return signature.as<FunctionSignature>();
    return std::nullopt;
}

// TODO: merge with TypeDefinition::index().
inline TypeIndex TypeInformation::get(const TypeDefinition& type)
{
    if (ASSERT_ENABLED) {
        TypeInformation& info = singleton();
        Locker locker { info.m_lock };
        ASSERT_UNUSED(info, info.m_typeSet.contains(TypeHash { const_cast<TypeDefinition&>(type) }));
    }
    return type.index();
}

inline RefPtr<const TypeDefinition> TypeInformation::getRef(TypeIndex typeIndex)
{
    if (typeIndexIsType(typeIndex) || typeIndex == TypeDefinition::invalidIndex)
        return nullptr;
    return TypeInformation::get(typeIndex);
}

} } // namespace JSC::Wasm

#endif // ENABLE(WEBASSEMBLY)
