/*******************************************************************************
 * Copyright IBM Corp. and others 2000
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution
 * and is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception [1] and GNU General Public
 * License, version 2 with the OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] https://openjdk.org/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
 *******************************************************************************/

#ifndef DEADSTOR_INCL
#define DEADSTOR_INCL

#include "optimizer/OptimizationManager.hpp"
#include "optimizer/IsolatedStoreElimination.hpp"

namespace TR {
class Optimization;
}

// Dead Store Elimination
//
// Uses the information computed by ReachingDefinitions (stored in
// UseDefInfo) to perform the transformation. If a store (def) node has no
// uses then remove the node from the IL trees. Usually useful
// after doing copy propagation.
//
// This class is derived from Isolated Store Elimination, which uses the use/def
// information if it is available and uses a tree walk if it isn't. When entered
// through this class there will always be use/def information unless it can't be
// built for size reasons.
//

class TR_DeadStoreElimination : public TR_IsolatedStoreElimination {
public:
    // Performs dead store elimination using the
    // use/def values of relevant nodes.
    //
    TR_DeadStoreElimination(TR::OptimizationManager *manager);

    static TR::Optimization *create(TR::OptimizationManager *manager)
    {
        return new (manager->allocator()) TR_DeadStoreElimination(manager);
    }

    virtual const char *optDetailString() const throw();
};

#endif
