text: /**
   * Copyright (c) 2018 Inria
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met: redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer;
   * 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;
   * neither the name of the copyright holders nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "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 THE COPYRIGHT
   * OWNER 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.
   */
  
  #include "mem/cache/replacement_policies/lru_rp.hh"
  
  #include <cassert>
  #include <memory>
  
  #include "params/LRURP.hh"
  
  LRURP::LRURP(const Params *p)
      : BaseReplacementPolicy(p)
  {
  }
  
  void
  LRURP::invalidate(const std::shared_ptr<ReplacementData>& replacement_data)
  const
  {
      // Reset last touch timestamp
      std::static_pointer_cast<LRUReplData>(
          replacement_data)->lastTouchTick = Tick(0);
  }
  
  void
  LRURP::touch(const std::shared_ptr<ReplacementData>& replacement_data) const
  {
      // Update last touch timestamp
      std::static_pointer_cast<LRUReplData>(
          replacement_data)->lastTouchTick = curTick();
  }
  
  void
  LRURP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const
  {
      // Set last touch timestamp
      std::static_pointer_cast<LRUReplData>(
          replacement_data)->lastTouchTick = curTick();
  }
  
  ReplaceableEntry*
  LRURP::getVictim(const ReplacementCandidates& candidates) const
  {
      // There must be at least one replacement candidate
      assert(candidates.size() > 0);
  
      // Visit all candidates to find victim
      ReplaceableEntry* victim = candidates[0];
      for (const auto& candidate : candidates) {
          // Update victim entry if necessary
          if (std::static_pointer_cast<LRUReplData>(
                      candidate->replacementData)->lastTouchTick <
                  std::static_pointer_cast<LRUReplData>(
                      victim->replacementData)->lastTouchTick) {
              victim = candidate;
          }
      }
  
      return victim;
  }
  
  std::shared_ptr<ReplacementData>
  LRURP::instantiateEntry()
  {
      return std::shared_ptr<ReplacementData>(new LRUReplData());
  }
  
  LRURP*
  LRURPParams::create()
  {
      return new LRURP(this);
  }
  