solidity/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>
#include <libsolidity/ast/AST.h>
using namespace std;
using namespace dev;
using namespace dev::solidity;
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SymbolicIntVariable::SymbolicIntVariable(
Declaration const& _decl,
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smt::SolverInterface& _interface
):
SymbolicVariable(_decl, _interface)
{
solAssert(m_declaration.type()->category() == Type::Category::Integer, "");
}
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)
{
auto const& intType = dynamic_cast<IntegerType const&>(*m_declaration.type());
m_interface.addAssertion(valueAtSequence(_seq) >= minValue(intType));
m_interface.addAssertion(valueAtSequence(_seq) <= maxValue(intType));
}
smt::Expression SymbolicIntVariable::minValue(IntegerType const& _t)
{
return smt::Expression(_t.minValue());
}
smt::Expression SymbolicIntVariable::maxValue(IntegerType const& _t)
{
return smt::Expression(_t.maxValue());
}