solidity/libyul/optimiser/KnowledgeBase.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/>.
*/
/**
* Class that can answer questions about values of variables and their relations.
*/
#pragma once
#include <libyul/AsmDataForward.h>
#include <libyul/YulString.h>
#include <map>
namespace yul
{
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struct Dialect;
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/**
* Class that can answer questions about values of variables and their relations.
*
* The reference to the map of values provided at construction is assumed to be updating.
*/
class KnowledgeBase
{
public:
KnowledgeBase(Dialect const& _dialect, std::map<YulString, Expression const*> const& _variableValues):
m_dialect(_dialect),
m_variableValues(_variableValues)
{}
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bool knownToBeDifferent(YulString _a, YulString _b);
bool knownToBeDifferentByAtLeast32(YulString _a, YulString _b);
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bool knownToBeEqual(YulString _a, YulString _b) const { return _a == _b; }
private:
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Expression simplify(Expression _expression);
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Dialect const& m_dialect;
std::map<YulString, Expression const*> const& m_variableValues;
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size_t m_recursionCounter = 0;
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};
}