solidity/libyul/optimiser/EquivalentFunctionDetector.h

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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.
*/
#pragma once
#include <libyul/optimiser/ASTWalker.h>
#include <libyul/optimiser/BlockHasher.h>
#include <libyul/AsmDataForward.h>
namespace yul
{
/**
* Optimiser component that detects syntactically equivalent functions.
*
* Prerequisite: Disambiguator, ForLoopInitRewriter
*/
class EquivalentFunctionDetector: public ASTWalker
{
public:
static std::map<YulString, FunctionDefinition const*> run(Block& _block)
{
EquivalentFunctionDetector detector{BlockHasher::run(_block)};
detector(_block);
return std::move(detector.m_duplicates);
}
using ASTWalker::operator();
void operator()(FunctionDefinition const& _fun) override;
private:
EquivalentFunctionDetector(std::map<Block const*, uint64_t> _blockHashes): m_blockHashes(std::move(_blockHashes)) {}
std::map<Block const*, uint64_t> m_blockHashes;
std::map<uint64_t, std::vector<FunctionDefinition const*>> m_candidates;
std::map<YulString, FunctionDefinition const*> m_duplicates;
};
}