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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/CVC4Interface.h>
#include <libsolidity/interface/Exceptions.h>
#include <libdevcore/CommonIO.h>
using namespace std;
using namespace dev;
using namespace dev::solidity::smt;
CVC4Interface::CVC4Interface():
m_solver(&m_context)
{
reset();
}
void CVC4Interface::reset()
{
m_constants.clear();
m_functions.clear();
m_solver.reset();
m_solver.setOption("produce-models", true);
}
void CVC4Interface::push()
{
m_solver.push();
}
void CVC4Interface::pop()
{
m_solver.pop();
}
Expression CVC4Interface::newFunction(string _name, Sort _domain, Sort _codomain)
{
CVC4::Type fType = m_context.mkFunctionType(cvc4Sort(_domain), cvc4Sort(_codomain));
m_functions.insert({_name, m_context.mkVar(_name.c_str(), fType)});
return SolverInterface::newFunction(move(_name), _domain, _codomain);
}
Expression CVC4Interface::newInteger(string _name)
{
m_constants.insert({_name, m_context.mkVar(_name.c_str(), m_context.integerType())});
return SolverInterface::newInteger(move(_name));
}
Expression CVC4Interface::newBool(string _name)
{
m_constants.insert({_name, m_context.mkVar(_name.c_str(), m_context.booleanType())});
return SolverInterface::newBool(std::move(_name));
}
void CVC4Interface::addAssertion(Expression const& _expr)
{
try
{
m_solver.assertFormula(toCVC4Expr(_expr));
}
catch (CVC4::TypeCheckingException const&)
{
solAssert(false, "");
}
catch (CVC4::LogicException const&)
{
solAssert(false, "");
}
catch (CVC4::UnsafeInterruptException const&)
{
solAssert(false, "");
}
}
pair<CheckResult, vector<string>> CVC4Interface::check(vector<Expression> const& _expressionsToEvaluate)
{
CheckResult result;
vector<string> values;
try
{
switch (m_solver.checkSat().isSat())
{
case CVC4::Result::SAT:
result = CheckResult::SATISFIABLE;
break;
case CVC4::Result::UNSAT:
result = CheckResult::UNSATISFIABLE;
break;
case CVC4::Result::SAT_UNKNOWN:
result = CheckResult::UNKNOWN;
break;
default:
solAssert(false, "");
}
if (result != CheckResult::UNSATISFIABLE && !_expressionsToEvaluate.empty())
{
for (Expression const& e: _expressionsToEvaluate)
values.push_back(toString(m_solver.getValue(toCVC4Expr(e))));
}
}
catch (CVC4::Exception & e)
{
result = CheckResult::ERROR;
values.clear();
}
return make_pair(result, values);
}
CVC4::Expr CVC4Interface::toCVC4Expr(Expression const& _expr)
{
if (_expr.arguments.empty() && m_constants.count(_expr.name))
return m_constants.at(_expr.name);
vector<CVC4::Expr> arguments;
for (auto const& arg: _expr.arguments)
arguments.push_back(toCVC4Expr(arg));
string const& n = _expr.name;
if (m_functions.count(n))
return m_context.mkExpr(CVC4::kind::APPLY_UF, m_functions[n], arguments);
else if (m_constants.count(n))
{
solAssert(arguments.empty(), "");
return m_constants.at(n);
}
else if (arguments.empty())
{
if (n == "true")
return m_context.mkConst(true);
else if (n == "false")
return m_context.mkConst(false);
else
// We assume it is an integer...
return m_context.mkConst(CVC4::Rational(n));
}
solAssert(_expr.hasCorrectArity(), "");
if (n == "ite")
return arguments[0].iteExpr(arguments[1], arguments[2]);
else if (n == "not")
return arguments[0].notExpr();
else if (n == "and")
return arguments[0].andExpr(arguments[1]);
else if (n == "or")
return arguments[0].orExpr(arguments[1]);
else if (n == "=")
return m_context.mkExpr(CVC4::kind::EQUAL, arguments[0], arguments[1]);
else if (n == "<")
return m_context.mkExpr(CVC4::kind::LT, arguments[0], arguments[1]);
else if (n == "<=")
return m_context.mkExpr(CVC4::kind::LEQ, arguments[0], arguments[1]);
else if (n == ">")
return m_context.mkExpr(CVC4::kind::GT, arguments[0], arguments[1]);
else if (n == ">=")
return m_context.mkExpr(CVC4::kind::GEQ, arguments[0], arguments[1]);
else if (n == "+")
return m_context.mkExpr(CVC4::kind::PLUS, arguments[0], arguments[1]);
else if (n == "-")
return m_context.mkExpr(CVC4::kind::MINUS, arguments[0], arguments[1]);
else if (n == "*")
return m_context.mkExpr(CVC4::kind::MULT, arguments[0], arguments[1]);
else if (n == "/")
return m_context.mkExpr(CVC4::kind::INTS_DIVISION_TOTAL, arguments[0], arguments[1]);
// Cannot reach here.
solAssert(false, "");
return arguments[0];
}
CVC4::Type CVC4Interface::cvc4Sort(Sort _sort)
{
switch (_sort)
{
case Sort::Bool:
return m_context.booleanType();
case Sort::Int:
return m_context.integerType();
default:
break;
}
solAssert(false, "");
// Cannot be reached.
return m_context.integerType();
}
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