/*

  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

/**

 * Optimiser component that changes the code so that all function definitions are at the top

 * level block.

 */

#pragma once

#include <libyul/ASTForward.h>

#include <libyul/optimiser/ASTWalker.h>

namespace solidity::yul

{

struct OptimiserStepContext;

/**

 * Moves all functions to the top-level scope.

 * Applying this transformation to source code that has ambiguous identifiers might

 * lead to invalid code.

 *

 * Prerequisites: Disambiguator

 */

class FunctionHoister: public ASTModifier

{

public:

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

  static void run(OptimiserStepContext&, Block& _ast) { FunctionHoister{}(_ast); }

  using ASTModifier::operator();

  void operator()(Block& _block) override;

private:

  FunctionHoister();

  ~FunctionHoister() override;

  bool m_isTopLevel = true;

  std::vector<Statement> m_functions;

};

}