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/*
 * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __ENCO_TRANSFORM_DEAD_OBJECT_ELIMINATION_H__
#define __ENCO_TRANSFORM_DEAD_OBJECT_ELIMINATION_H__

#include "Code.h"
#include "Pass.h"

namespace enco
{

/**
 * @brief Eliminate dead objects in IR
 *
 * An object whose backing bag is unused is referred to as a dead object.
 *
 * Dead Object Elimination (DOE) eliminates such dead objects along with their producer.
 */
void eliminate_dead_object(enco::Code *code);

struct DeadObjectEliminationPass final : public Pass
{
  PASS_CTOR(DeadObjectEliminationPass)
  {
    // DO NOTHING
  }

  void run(const SessionID &sess) const override { eliminate_dead_object(code(sess)); }
};

} // namespace enco

#endif // __ENCO_TRANSFORM_DEAD_OBJECT_ELIMINATION_H__