/*
 * Copyright (C) 2022 Leaning Technologies 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>

namespace JSC {
namespace Wasm {

enum class BranchHint : uint8_t {
    Unlikely,
    Likely,
    Invalid,
};

class BranchHintMap {

public:

    void add(uint32_t branchOffset, BranchHint hint)
    {
        m_map.add(branchOffset, hint);
    }

    BranchHint getBranchHint(uint32_t branchOffset) const
    {
        auto it = m_map.find(branchOffset);
        if (it == m_map.end())
            return BranchHint::Invalid;
        return it->value;
    }

    bool isValidKey(uint32_t branchOffset) const
    {
        return m_map.isValidKey(branchOffset);
    }

private:

    UncheckedKeyHashMap<uint32_t, BranchHint, IntHash<uint32_t>, WTF::UnsignedWithZeroKeyHashTraits<uint32_t>> m_map;

};

inline constexpr bool isValidBranchHint(BranchHint hint)
{
    switch (hint) {
    case BranchHint::Likely:
    case BranchHint::Unlikely:
        return true;
    default:
        return false;
    }
    return false;
}

}
} // namespace JSC::Wasm
