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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/>.
*/
#pragma once
#include <libsolidity/formal/SolverInterface.h>
#include <libsolidity/ast/Types.h>
#include <memory>
namespace dev
{
namespace solidity
{
class Type;
/**
* This class represents the symbolic version of a program variable.
*/
class SymbolicVariable
{
public:
SymbolicVariable(
Type const& _type,
std::string const& _uniqueName,
smt::SolverInterface& _interface
);
virtual ~SymbolicVariable() = default;
smt::Expression operator()(int _seq) const
{
return valueAtSequence(_seq);
}
std::string uniqueSymbol(int _seq) const;
/// Sets the var to the default value of its type.
virtual void setZeroValue(int _seq) = 0;
/// The unknown value is the full range of valid values,
/// and that's sub-type dependent.
virtual void setUnknownValue(int _seq) = 0;
protected:
virtual smt::Expression valueAtSequence(int _seq) const = 0;
Type const& m_type;
std::string m_uniqueName;
smt::SolverInterface& m_interface;
};
}
}
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