path: root/libyul/optimiser/MainFunction.cpp

/*
    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/>.
*/
/**
 * Changes the topmost block to be a function with a specific name ("main") which has no
 * inputs nor outputs.
 */

#include <libyul/optimiser/MainFunction.h>

#include <libyul/optimiser/NameCollector.h>
#include <libyul/Exceptions.h>

#include <libsolidity/inlineasm/AsmData.h>

#include <libdevcore/CommonData.h>

using namespace std;
using namespace dev;
using namespace dev::yul;
using namespace dev::solidity;

void MainFunction::operator()(Block& _block)
{
    assertThrow(_block.statements.size() >= 1, OptimizerException, "");
    assertThrow(_block.statements[0].type() == typeid(Block), OptimizerException, "");
    for (size_t i = 1; i < _block.statements.size(); ++i)
        assertThrow(_block.statements.at(i).type() == typeid(FunctionDefinition), OptimizerException, "");
    /// @todo this should handle scopes properly and instead of an assertion it should rename the conflicting function
    assertThrow(NameCollector(_block).names().count(YulString{"main"}) == 0, OptimizerException, "");

    Block& block = boost::get<Block>(_block.statements[0]);
    FunctionDefinition main{
        block.location,
        YulString{"main"},
        {},
        {},
        std::move(block)
    };
    _block.statements[0] = std::move(main);
}