[SMTChecker] A little refactoring on SSA vars

libsolidity/formal/SSAVariable.cpp

@@ -0,0 +1,66 @@
+/*
+	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/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 (dynamic_cast<IntegerType const*>(_decl->type().get()))
+		m_symbVar = make_shared<SymbolicIntVariable>(_decl, _interface);
+	else
+	{
+		//solAssert(false, "");
+	}
+}
+
+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_symbVar->setZeroValue(index());
+}
+
+void SSAVariable::setUnknownValue()
+{
+	m_symbVar->setUnknownValue(index());
+}