/*

  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

#include <libyul/optimiser/BlockFlattener.h>

#include <libyul/AST.h>

#include <libsolutil/CommonData.h>

#include <functional>

using namespace std;

using namespace solidity;

using namespace solidity::yul;

using namespace solidity::util;

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

{

  ASTModifier::operator()(_block);

  iterateReplacing(

    _block.statements,

    [](Statement& _s) -> std::optional<vector<Statement>>

    {

      if (holds_alternative<Block>(_s))

        return std::move(std::get<Block>(_s).statements);

      else

        return {};

    }

  );

}

void BlockFlattener::run(OptimiserStepContext&, Block& _ast)

{

  BlockFlattener flattener;

  for (auto& statement: _ast.statements)

    if (auto* block = get_if<Block>(&statement))

      flattener(*block);

    else if (auto* function = get_if<FunctionDefinition>(&statement))

      flattener(function->body);

    else

      yulAssert(false, "BlockFlattener requires the FunctionGrouper.");

}