solidity/libyul/optimiser/EquivalentFunctionDetector.cpp

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/*
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 combines syntactically equivalent functions.
*/
#include <libyul/optimiser/EquivalentFunctionDetector.h>
#include <libyul/optimiser/SyntacticalEquality.h>
#include <libyul/AsmData.h>
#include <libyul/optimiser/Metrics.h>
using namespace std;
using namespace dev;
using namespace yul;
using namespace solidity;
void EquivalentFunctionDetector::operator()(FunctionDefinition const& _fun)
{
RoughHeuristic heuristic(_fun);
auto& candidates = m_candidates[heuristic];
for (auto const& candidate: candidates)
if (SyntacticallyEqual{}.statementEqual(_fun, *candidate))
{
m_duplicates[_fun.name] = candidate;
return;
}
candidates.push_back(&_fun);
}
bool EquivalentFunctionDetector::RoughHeuristic::operator<(EquivalentFunctionDetector::RoughHeuristic const& _rhs) const
{
if (
std::make_tuple(m_fun.parameters.size(), m_fun.returnVariables.size()) ==
std::make_tuple(_rhs.m_fun.parameters.size(), _rhs.m_fun.returnVariables.size())
)
return codeSize() < _rhs.codeSize();
else
return
std::make_tuple(m_fun.parameters.size(), m_fun.returnVariables.size()) <
std::make_tuple(_rhs.m_fun.parameters.size(), _rhs.m_fun.returnVariables.size());
}
size_t EquivalentFunctionDetector::RoughHeuristic::codeSize() const
{
if (!m_codeSize)
m_codeSize = CodeSize::codeSize(m_fun.body);
return *m_codeSize;
}