/*

  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/>.

*/

// SPDX-License-Identifier: GPL-3.0

#pragma once

#include <libyul/optimiser/ASTWalker.h>

#include <libyul/optimiser/OptimiserStep.h>

#include <libsolutil/Common.h>

namespace solidity::yul

{

/**

 * Structural simplifier. Performs the following simplification steps:

 * - replace if with true condition with its body

 * - remove if with false condition

 * - replace switch with const expr with matching case body

 * - replace for with false condition by its initialization part

 *

 * The LiteralRematerialiser should be run before this.

 *

 * Prerequisite: Disambiguator.

 *

 * Important: Can only be used on EVM code.

 */

class StructuralSimplifier: public ASTModifier

{

public:

  static constexpr char const* name{"StructuralSimplifier"};

  static void run(OptimiserStepContext&, Block& _ast);

  using ASTModifier::operator();

  void operator()(Block& _block) override;

private:

  StructuralSimplifier() = default;

  void simplify(std::vector<Statement>& _statements);

};

}