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//===- llvm/ADT/ilist_node_base.h - Intrusive List Node Base -----*- C++ -*-==//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

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

#ifndef LLVM_ADT_ILIST_NODE_BASE_H

#define LLVM_ADT_ILIST_NODE_BASE_H

#include "llvm/ADT/PointerIntPair.h"

namespace llvm {

/// Base class for ilist nodes.

///

/// Optionally tracks whether this node is the sentinel.

template <bool EnableSentinelTracking> class ilist_node_base;

template <> class ilist_node_base<false> {

  ilist_node_base *Prev = nullptr;

  ilist_node_base *Next = nullptr;

public:

  void setPrev(ilist_node_base *Prev) { this->Prev = Prev; }

  void setNext(ilist_node_base *Next) { this->Next = Next; }

  ilist_node_base *getPrev() const { return Prev; }

  ilist_node_base *getNext() const { return Next; }

  bool isKnownSentinel() const { return false; }

  void initializeSentinel() {}

};

template <> class ilist_node_base<true> {

  PointerIntPair<ilist_node_base *, 1> PrevAndSentinel;

  ilist_node_base *Next = nullptr;

public:

  void setPrev(ilist_node_base *Prev) { PrevAndSentinel.setPointer(Prev); }

  void setNext(ilist_node_base *Next) { this->Next = Next; }

  ilist_node_base *getPrev() const { return PrevAndSentinel.getPointer(); }

  ilist_node_base *getNext() const { return Next; }

  bool isSentinel() const { return PrevAndSentinel.getInt(); }

  bool isKnownSentinel() const { return isSentinel(); }

  void initializeSentinel() { PrevAndSentinel.setInt(true); }

};

} // end namespace llvm

#endif // LLVM_ADT_ILIST_NODE_BASE_H