/*

  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/FunctionReferenceResolver.h>

#include <libyul/AST.h>

#include <libsolutil/CommonData.h>

#include <range/v3/view/reverse.hpp>

using namespace solidity::yul;

using namespace solidity::util;

FunctionReferenceResolver::FunctionReferenceResolver(Block const& _ast)

{

  (*this)(_ast);

  yulAssert(m_scopes.empty());

}

void FunctionReferenceResolver::operator()(FunctionCall const& _functionCall)

{

  if (!isBuiltinFunctionCall(_functionCall))

    for (auto&& scope: m_scopes | ranges::views::reverse)

    {

      yulAssert(std::holds_alternative<Identifier>(_functionCall.functionName));

      if (FunctionDefinition const** function = util::valueOrNullptr(scope, std::get<Identifier>(_functionCall.functionName).name))

      {

        m_functionReferences[&_functionCall] = *function;

        break;

      }

    }

  ASTWalker::operator()(_functionCall);

}

void FunctionReferenceResolver::operator()(Block const& _block)

{

  m_scopes.emplace_back();

  for (auto const& statement: _block.statements)

    if (auto const* function = std::get_if<FunctionDefinition>(&statement))

      m_scopes.back()[function->name] = function;

  ASTWalker::operator()(_block);

  m_scopes.pop_back();

}