From d8cbf321dafbe85f6fde07b5dd4ce7a3abffaeb6 Mon Sep 17 00:00:00 2001
From: Leonardo Alt <leo@ethereum.org>
Date: Mon, 22 Oct 2018 10:29:03 +0200
Subject: Grouping of symbolic variables in the same file and support to
 FixedBytes

---
 libsolidity/formal/SymbolicVariables.cpp | 112 +++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 libsolidity/formal/SymbolicVariables.cpp

(limited to 'libsolidity/formal/SymbolicVariables.cpp')

diff --git a/libsolidity/formal/SymbolicVariables.cpp b/libsolidity/formal/SymbolicVariables.cpp
new file mode 100644
index 00000000..85818ba0
--- /dev/null
+++ b/libsolidity/formal/SymbolicVariables.cpp
@@ -0,0 +1,112 @@
+/*
+	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/SymbolicVariables.h>
+
+#include <libsolidity/formal/SymbolicTypes.h>
+
+#include <libsolidity/ast/AST.h>
+
+using namespace std;
+using namespace dev;
+using namespace dev::solidity;
+
+SymbolicVariable::SymbolicVariable(
+	TypePointer _type,
+	string const& _uniqueName,
+	smt::SolverInterface& _interface
+):
+	m_type(move(_type)),
+	m_uniqueName(_uniqueName),
+	m_interface(_interface),
+	m_ssa(make_shared<SSAVariable>())
+{
+}
+
+string SymbolicVariable::uniqueSymbol(unsigned _index) const
+{
+	return m_uniqueName + "_" + to_string(_index);
+}
+
+SymbolicBoolVariable::SymbolicBoolVariable(
+	TypePointer _type,
+	string const& _uniqueName,
+	smt::SolverInterface&_interface
+):
+	SymbolicVariable(move(_type), _uniqueName, _interface)
+{
+	solAssert(m_type->category() == Type::Category::Bool, "");
+}
+
+smt::Expression SymbolicBoolVariable::valueAtIndex(int _index) const
+{
+	return m_interface.newBool(uniqueSymbol(_index));
+}
+
+void SymbolicBoolVariable::setZeroValue()
+{
+	m_interface.addAssertion(currentValue() == smt::Expression(false));
+}
+
+void SymbolicBoolVariable::setUnknownValue()
+{
+}
+
+SymbolicIntVariable::SymbolicIntVariable(
+	TypePointer _type,
+	string const& _uniqueName,
+	smt::SolverInterface& _interface
+):
+	SymbolicVariable(move(_type), _uniqueName, _interface)
+{
+	solAssert(isNumber(m_type->category()), "");
+}
+
+smt::Expression SymbolicIntVariable::valueAtIndex(int _index) const
+{
+	return m_interface.newInteger(uniqueSymbol(_index));
+}
+
+void SymbolicIntVariable::setZeroValue()
+{
+	m_interface.addAssertion(currentValue() == 0);
+}
+
+void SymbolicIntVariable::setUnknownValue()
+{
+	auto intType = dynamic_cast<IntegerType const*>(m_type.get());
+	solAssert(intType, "");
+	m_interface.addAssertion(currentValue() >= minValue(*intType));
+	m_interface.addAssertion(currentValue() <= maxValue(*intType));
+}
+
+SymbolicAddressVariable::SymbolicAddressVariable(
+	string const& _uniqueName,
+	smt::SolverInterface& _interface
+):
+	SymbolicIntVariable(make_shared<IntegerType>(160), _uniqueName, _interface)
+{
+}
+
+SymbolicFixedBytesVariable::SymbolicFixedBytesVariable(
+	unsigned _numBytes,
+	string const& _uniqueName,
+	smt::SolverInterface& _interface
+):
+	SymbolicIntVariable(make_shared<IntegerType>(_numBytes * 8), _uniqueName, _interface)
+{
+}
-- 
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