libsolidity/formal/SSAVariable.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/SSAVariable.h>

#include <libsolidity/formal/SymbolicBoolVariable.h>
#include <libsolidity/formal/SymbolicIntVariable.h>

#include <libsolidity/ast/AST.h>

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

SSAVariable::SSAVariable(
    Declaration const& _decl,
    smt::SolverInterface& _interface
)
{
    resetIndex();

    if (isInteger(_decl.type()->category()))
        m_symbolicVar = make_shared<SymbolicIntVariable>(_decl, _interface);
    else if (isBool(_decl.type()->category()))
        m_symbolicVar = make_shared<SymbolicBoolVariable>(_decl, _interface);
    else
    {
        solAssert(false, "");
    }
}

bool SSAVariable::isSupportedType(Type::Category _category)
{
    return isInteger(_category) || isBool(_category);
}

bool SSAVariable::isInteger(Type::Category _category)
{
    return _category == Type::Category::Integer || _category == Type::Category::Address;
}

bool SSAVariable::isBool(Type::Category _category)
{
    return _category == Type::Category::Bool;
}

void SSAVariable::resetIndex()
{
    m_currentSequenceCounter = 0;
    m_nextFreeSequenceCounter.reset (new int);
    *m_nextFreeSequenceCounter = 1;
}

int SSAVariable::index() const
{
    return m_currentSequenceCounter;
}

int SSAVariable::next() const
{
    return *m_nextFreeSequenceCounter;
}

void SSAVariable::setZeroValue()
{
    m_symbolicVar->setZeroValue(index());
}

void SSAVariable::setUnknownValue()
{
    m_symbolicVar->setUnknownValue(index());
}