// SPDX-License-Identifier: Apache-2.0

// SPDX-FileCopyrightText: Copyright The WasmEdge Authors

//===-- wasmedge/runtime/instance/elem.h - Element Instance definition ----===//

//

// Part of the WasmEdge Project.

//

//===----------------------------------------------------------------------===//

///

/// \file

/// This file contains the element instance definition in store manager.

///

//===----------------------------------------------------------------------===//

#pragma once

#include "common/span.h"

#include "common/types.h"

#include <vector>

namespace WasmEdge {

namespace Runtime {

namespace Instance {

class ElementInstance {

public:

  ElementInstance() = delete;

  ElementInstance(const uint64_t Offset, const ValType &EType,

                  Span<const RefVariant> Init) noexcept

      : Off(Offset), Type(EType), Refs(Init.begin(), Init.end()) {

    assuming(Type.isRefType());

  }

  /// Get offset in element instance.

  uint64_t getOffset() const noexcept { return Off; }

  /// Get reference type of element instance.

  const ValType &getRefType() const noexcept { return Type; }

  /// Get reference lists in element instance.

  Span<const RefVariant> getRefs() const noexcept { return Refs; }

  /// Clear references in element instance.

  void clear() noexcept {

    Refs.clear();

    Dropped = true;

  }

  bool isDropped() const noexcept { return Dropped; }

private:

  /// \name Data of element instance.

  /// @{

  const uint64_t Off;

  const ValType Type;

  std::vector<RefVariant> Refs;

  bool Dropped = false;

  /// @}

};

} // namespace Instance

} // namespace Runtime

} // namespace WasmEdge