/*

  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 it consists of a block starting with

 * a single block followed only by function definitions and with no functions defined

 * anywhere else.

 */

#include <libyul/optimiser/FunctionHoister.h>

#include <libyul/optimiser/OptimizerUtilities.h>

#include <libyul/AST.h>

#include <libsolutil/CommonData.h>

using namespace solidity;

using namespace solidity::yul;

FunctionHoister::FunctionHoister() = default;

FunctionHoister::~FunctionHoister() = default;

void FunctionHoister::operator()(Block& _block)

{

  bool topLevel = m_isTopLevel;

  m_isTopLevel = false;

  for (auto&& statement: _block.statements)

  {

    std::visit(*this, statement);

    if (std::holds_alternative<FunctionDefinition>(statement))

    {

      m_functions.emplace_back(std::move(statement));

      statement = Block{_block.debugData, {}};

    }

  }

  removeEmptyBlocks(_block);

  if (topLevel)

    _block.statements += std::move(m_functions);

}