solidity/libyul/optimiser/FunctionGrouper.cpp
2019-11-19 17:23:18 +01:00

62 lines
1.8 KiB
C++

/*
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/>.
*/
/**
* Optimiser component that changes the code of a block so that all non-function definition
* statements are moved to a block of their own followed by all function definitions.
*/
#include <libyul/optimiser/FunctionGrouper.h>
#include <libyul/AsmData.h>
#include <boost/range/algorithm_ext/erase.hpp>
using namespace std;
using namespace dev;
using namespace yul;
void FunctionGrouper::operator()(Block& _block)
{
if (alreadyGrouped(_block))
return;
vector<Statement> reordered;
reordered.emplace_back(Block{_block.location, {}});
for (auto&& statement: _block.statements)
{
if (holds_alternative<FunctionDefinition>(statement))
reordered.emplace_back(std::move(statement));
else
std::get<Block>(reordered.front()).statements.emplace_back(std::move(statement));
}
_block.statements = std::move(reordered);
}
bool FunctionGrouper::alreadyGrouped(Block const& _block)
{
if (_block.statements.empty())
return false;
if (!holds_alternative<Block>(_block.statements.front()))
return false;
for (size_t i = 1; i < _block.statements.size(); ++i)
if (!holds_alternative<FunctionDefinition>(_block.statements.at(i)))
return false;
return true;
}