/*

  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>

namespace solidity::yul

{

/**

 * Resolves references to user-defined functions in function calls.

 * Assumes the code is correct, i.e. does not check for references to be valid or unique.

 *

 * Be careful not to iterate over the result - it is not deterministic.

 */

class FunctionReferenceResolver: private ASTWalker

{

public:

  explicit FunctionReferenceResolver(Block const& _ast);

  std::map<FunctionCall const*, FunctionDefinition const*> const& references() const { return m_functionReferences; }

private:

  using ASTWalker::operator();

  void operator()(FunctionCall const& _functionCall) override;

  void operator()(Block const& _block) override;

  std::map<FunctionCall const*, FunctionDefinition const*> m_functionReferences;

  std::vector<std::map<YulName, FunctionDefinition const*>> m_scopes;

};

}