mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
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/*
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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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#pragma once
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#include <libyul/AST.h>
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#include <libyul/Dialect.h>
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#include <libyul/Exceptions.h>
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// because of instruction
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#include <libyul/backends/evm/EVMDialect.h>
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#include <libsmtutil/SolverInterface.h>
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#include <memory>
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namespace solidity::smtutil
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{
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class SolverInterface;
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class Expression;
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struct Sort;
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}
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namespace solidity::yul
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{
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/**
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* Base class for SMT based optimization steps.
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*
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* Works best when used with AST in SSA form.
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*/
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class SMTSolver
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{
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protected:
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SMTSolver(
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std::set<YulString> const& _ssaVariables,
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Dialect const& _dialect
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);
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/// Helper function that encodes VariableDeclaration
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void encodeVariableDeclaration(VariableDeclaration const& _varDecl);
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/// The encoding for a builtin. The type of encoding determines what we are
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/// solving for.
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virtual smtutil::Expression encodeEVMBuiltin(
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evmasm::Instruction _instruction,
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std::vector<Expression> const& _arguments
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) = 0;
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smtutil::Expression encodeExpression(Expression const& _expression);
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static smtutil::Expression int2bv(smtutil::Expression _arg);
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static smtutil::Expression bv2int(smtutil::Expression _arg);
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smtutil::Expression newVariable();
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virtual smtutil::Expression newRestrictedVariable(bigint _maxValue = (bigint(1) << 256) - 1);
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std::string uniqueName();
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virtual std::shared_ptr<smtutil::Sort> defaultSort() const;
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static smtutil::Expression booleanValue(smtutil::Expression _value);
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static smtutil::Expression constantValue(bigint _value);
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static smtutil::Expression literalValue(Literal const& _literal);
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static smtutil::Expression twosComplementToSigned(smtutil::Expression _value);
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static smtutil::Expression signedToTwosComplement(smtutil::Expression _value);
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smtutil::Expression wrap(smtutil::Expression _value);
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std::set<YulString> const& m_ssaVariables;
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std::unique_ptr<smtutil::SolverInterface> m_solver;
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std::map<YulString, smtutil::Expression> m_variables;
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Dialect const& m_dialect;
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private:
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size_t m_varCounter = 0;
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};
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}
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