/*

 * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#pragma once

#include <AK/Format.h>

namespace JS::Bytecode {

class Register {

public:

    constexpr static u32 accumulator_index = 0;

    static constexpr Register accumulator()

    {

        return Register(accumulator_index);

    }

    constexpr static u32 saved_return_value_index = 1;

    static constexpr Register saved_return_value()

    {

        return Register(saved_return_value_index);

    }

    static constexpr u32 exception_index = 2;

    static constexpr Register exception()

    {

        return Register(exception_index);

    }

    static constexpr Register this_value()

    {

        constexpr u32 this_value_index = 3;

        return Register(this_value_index);

    }

    static constexpr Register return_value()

    {

        constexpr u32 return_value_index = 4;

        return Register(return_value_index);

    }

    static constexpr Register saved_exception()

    {

        constexpr u32 saved_exception_index = 5;

        return Register(saved_exception_index);

    }

    static constexpr u32 reserved_register_count = 6;

    constexpr explicit Register(u32 index)

        : m_index(index)

    {

    }

    constexpr bool operator==(Register reg) const { return m_index == reg.index(); }

    constexpr u32 index() const { return m_index; }

private:

    u32 m_index;

};

}

template<>

struct AK::Formatter<JS::Bytecode::Register> : AK::Formatter<FormatString> {

    ErrorOr<void> format(FormatBuilder& builder, JS::Bytecode::Register const& value)

    {

        if (value.index() == JS::Bytecode::Register::accumulator_index)

            return builder.put_string("acc"sv);

        return AK::Formatter<FormatString>::format(builder, "${}"sv, value.index());

    }

};