libsolidity/formal/SymbolicIntVariable.cpp


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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/>.
*/

#include <libsolidity/formal/SymbolicIntVariable.h>

using namespace std;
using namespace dev;
using namespace dev::solidity;

SymbolicIntVariable::SymbolicIntVariable(
    Type const& _type,
    string const& _uniqueName,
    smt::SolverInterface& _interface
):
    SymbolicVariable(_type, _uniqueName, _interface)
{
    solAssert(
        _type.category() == Type::Category::Integer ||
        _type.category() == Type::Category::Address,
        ""
    );
}

smt::Expression SymbolicIntVariable::valueAtSequence(int _seq) const
{
    return m_interface.newInteger(uniqueSymbol(_seq));
}

void SymbolicIntVariable::setZeroValue(int _seq)
{
    m_interface.addAssertion(valueAtSequence(_seq) == 0);
}

void SymbolicIntVariable::setUnknownValue(int _seq)
{
    if (m_type.category() == Type::Category::Integer)
    {
        auto intType = dynamic_cast<IntegerType const*>(&m_type);
        solAssert(intType, "");
        m_interface.addAssertion(valueAtSequence(_seq) >= minValue(*intType));
        m_interface.addAssertion(valueAtSequence(_seq) <= maxValue(*intType));
    }
    else
    {
        solAssert(m_type.category() == Type::Category::Address, "");
        IntegerType addrType{160};
        m_interface.addAssertion(valueAtSequence(_seq) >= minValue(addrType));
        m_interface.addAssertion(valueAtSequence(_seq) <= maxValue(addrType));
    }
}

smt::Expression SymbolicIntVariable::minValue(IntegerType const& _t)
{
    return smt::Expression(_t.minValue());
}

smt::Expression SymbolicIntVariable::maxValue(IntegerType const& _t)
{
    return smt::Expression(_t.maxValue());
}