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Diffstat (limited to 'libyul/optimiser/EquivalentFunctionDetector.cpp')
| -rw-r--r-- | libyul/optimiser/EquivalentFunctionDetector.cpp | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libyul/optimiser/EquivalentFunctionDetector.cpp b/libyul/optimiser/EquivalentFunctionDetector.cpp new file mode 100644 index 00000000..d3a697bd --- /dev/null +++ b/libyul/optimiser/EquivalentFunctionDetector.cpp @@ -0,0 +1,63 @@ +/* + 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; +} |