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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/SSAVariable.h>
#include <libsolidity/formal/SolverInterface.h>
#include <libsolidity/ast/Types.h>
#include <memory>
namespace dev
{
namespace solidity
{
class Type;
/**
* This abstract class represents the symbolic version of a program variable.
*/
class SymbolicVariable
{
public:
SymbolicVariable(
TypePointer _type,
std::string const& _uniqueName,
smt::SolverInterface& _interface
);
virtual ~SymbolicVariable() = default;
smt::Expression currentValue() const;
std::string currentName() const;
virtual smt::Expression valueAtIndex(int _index) const;
virtual smt::Expression increaseIndex();
virtual smt::Expression operator()(std::vector<smt::Expression> /*_arguments*/) const
{
solAssert(false, "Function application to non-function.");
}
unsigned index() const { return m_ssa->index(); }
unsigned& index() { return m_ssa->index(); }
TypePointer const& type() const { return m_type; }
protected:
std::string uniqueSymbol(unsigned _index) const;
TypePointer m_type;
std::string m_uniqueName;
smt::SolverInterface& m_interface;
std::shared_ptr<SSAVariable> m_ssa;
};
/**
* Specialization of SymbolicVariable for Bool
*/
class SymbolicBoolVariable: public SymbolicVariable
{
public:
SymbolicBoolVariable(
TypePointer _type,
std::string const& _uniqueName,
smt::SolverInterface& _interface
);
};
/**
* Specialization of SymbolicVariable for Integers
*/
class SymbolicIntVariable: public SymbolicVariable
{
public:
SymbolicIntVariable(
TypePointer _type,
std::string const& _uniqueName,
smt::SolverInterface& _interface
);
};
/**
* Specialization of SymbolicVariable for Address
*/
class SymbolicAddressVariable: public SymbolicIntVariable
{
public:
SymbolicAddressVariable(
std::string const& _uniqueName,
smt::SolverInterface& _interface
);
};
/**
* Specialization of SymbolicVariable for FixedBytes
*/
class SymbolicFixedBytesVariable: public SymbolicIntVariable
{
public:
SymbolicFixedBytesVariable(
unsigned _numBytes,
std::string const& _uniqueName,
smt::SolverInterface& _interface
);
};
/**
* Specialization of SymbolicVariable for FunctionType
*/
class SymbolicFunctionVariable: public SymbolicVariable
{
public:
SymbolicFunctionVariable(
TypePointer _type,
std::string const& _uniqueName,
smt::SolverInterface& _interface
);
smt::Expression increaseIndex();
smt::Expression operator()(std::vector<smt::Expression> _arguments) const;
private:
/// Creates a new function declaration.
void resetDeclaration();
/// Stores the current function declaration.
smt::Expression m_declaration;
};
}
}
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