path: root/libyul/optimiser/CommonSubexpressionEliminator.h

/*
    This file is part of solidity.

    solidity is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    solidity is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * Optimisation stage that replaces expressions known to be the current value of a variable
 * in scope by a reference to that variable.
 */

#pragma once

#include <libyul/optimiser/DataFlowAnalyzer.h>

namespace yul
{

/**
 * Optimisation stage that replaces expressions known to be the current value of a variable
 * in scope by a reference to that variable.
 *
 * Prerequisite: Disambiguator
 */
class CommonSubexpressionEliminator: public DataFlowAnalyzer
{
protected:
    using ASTModifier::visit;
    void visit(Expression& _e) override;
};

}