mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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/**
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* Class that can answer questions about values of variables and their relations.
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*/
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#pragma once
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#include <libyul/ASTForward.h>
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#include <libyul/YulString.h>
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#include <libsolutil/Common.h>
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#include <map>
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namespace solidity::yul
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{
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struct Dialect;
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struct AssignedValue;
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/**
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* Class that can answer questions about values of variables and their relations.
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*
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* The reference to the map of values provided at construction is assumed to be updating.
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*/
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class KnowledgeBase
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{
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public:
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KnowledgeBase(Dialect const& _dialect, std::map<YulString, AssignedValue> const& _variableValues):
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m_dialect(_dialect),
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m_variableValues(_variableValues)
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{}
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bool knownToBeDifferent(YulString _a, YulString _b);
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std::optional<u256> differenceIfKnownConstant(YulString _a, YulString _b);
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bool knownToBeDifferentByAtLeast32(YulString _a, YulString _b);
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bool knownToBeEqual(YulString _a, YulString _b) const { return _a == _b; }
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bool knownToBeZero(YulString _a);
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std::optional<u256> valueIfKnownConstant(YulString _a);
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private:
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Expression simplify(Expression _expression);
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Expression simplifyRecursively(Expression _expression);
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Dialect const& m_dialect;
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std::map<YulString, AssignedValue> const& m_variableValues;
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size_t m_counter = 0;
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};
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}
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