mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
334 lines
10 KiB
C++
334 lines
10 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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#include <libsmtutil/CVC4Interface.h>
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#include <libsolutil/CommonIO.h>
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#include <cvc4/util/bitvector.h>
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using namespace std;
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using namespace solidity;
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using namespace solidity::util;
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using namespace solidity::smtutil;
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CVC4Interface::CVC4Interface(optional<unsigned> _queryTimeout):
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SolverInterface(_queryTimeout),
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m_solver(&m_context)
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{
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reset();
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}
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void CVC4Interface::reset()
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{
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m_variables.clear();
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m_solver.reset();
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m_solver.setOption("produce-models", true);
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if (m_queryTimeout)
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m_solver.setTimeLimit(*m_queryTimeout);
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else
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m_solver.setResourceLimit(resourceLimit);
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}
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void CVC4Interface::push()
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{
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m_solver.push();
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}
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void CVC4Interface::pop()
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{
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m_solver.pop();
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}
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void CVC4Interface::declareVariable(string const& _name, SortPointer const& _sort)
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{
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smtAssert(_sort, "");
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m_variables[_name] = m_context.mkVar(_name.c_str(), cvc4Sort(*_sort));
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}
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void CVC4Interface::addAssertion(Expression const& _expr)
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{
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try
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{
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m_solver.assertFormula(toCVC4Expr(_expr));
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}
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catch (CVC4::TypeCheckingException const& _e)
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{
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smtAssert(false, _e.what());
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}
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catch (CVC4::LogicException const& _e)
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{
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smtAssert(false, _e.what());
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}
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catch (CVC4::UnsafeInterruptException const& _e)
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{
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smtAssert(false, _e.what());
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}
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catch (CVC4::Exception const& _e)
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{
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smtAssert(false, _e.what());
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}
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}
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pair<CheckResult, vector<string>> CVC4Interface::check(vector<Expression> const& _expressionsToEvaluate)
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{
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CheckResult result;
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vector<string> values;
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try
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{
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switch (m_solver.checkSat().isSat())
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{
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case CVC4::Result::SAT:
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result = CheckResult::SATISFIABLE;
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break;
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case CVC4::Result::UNSAT:
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result = CheckResult::UNSATISFIABLE;
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break;
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case CVC4::Result::SAT_UNKNOWN:
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result = CheckResult::UNKNOWN;
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break;
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default:
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smtAssert(false, "");
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}
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if (result == CheckResult::SATISFIABLE && !_expressionsToEvaluate.empty())
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{
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for (Expression const& e: _expressionsToEvaluate)
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values.push_back(toString(m_solver.getValue(toCVC4Expr(e))));
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}
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}
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catch (CVC4::Exception const&)
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{
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result = CheckResult::ERROR;
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values.clear();
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}
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return make_pair(result, values);
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}
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CVC4::Expr CVC4Interface::toCVC4Expr(Expression const& _expr)
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{
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// Variable
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if (_expr.arguments.empty() && m_variables.count(_expr.name))
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return m_variables.at(_expr.name);
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vector<CVC4::Expr> arguments;
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for (auto const& arg: _expr.arguments)
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arguments.push_back(toCVC4Expr(arg));
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try
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{
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string const& n = _expr.name;
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// Function application
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if (!arguments.empty() && m_variables.count(_expr.name))
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return m_context.mkExpr(CVC4::kind::APPLY_UF, m_variables.at(n), arguments);
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// Literal
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else if (arguments.empty())
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{
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if (n == "true")
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return m_context.mkConst(true);
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else if (n == "false")
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return m_context.mkConst(false);
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else if (auto sortSort = dynamic_pointer_cast<SortSort>(_expr.sort))
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return m_context.mkVar(n, cvc4Sort(*sortSort->inner));
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else
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try
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{
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return m_context.mkConst(CVC4::Rational(n));
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}
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catch (CVC4::TypeCheckingException const& _e)
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{
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smtAssert(false, _e.what());
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}
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catch (CVC4::Exception const& _e)
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{
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smtAssert(false, _e.what());
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}
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}
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smtAssert(_expr.hasCorrectArity(), "");
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if (n == "ite")
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return arguments[0].iteExpr(arguments[1], arguments[2]);
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else if (n == "not")
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return arguments[0].notExpr();
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else if (n == "and")
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return arguments[0].andExpr(arguments[1]);
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else if (n == "or")
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return arguments[0].orExpr(arguments[1]);
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else if (n == "implies")
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return m_context.mkExpr(CVC4::kind::IMPLIES, arguments[0], arguments[1]);
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else if (n == "=")
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return m_context.mkExpr(CVC4::kind::EQUAL, arguments[0], arguments[1]);
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else if (n == "<")
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return m_context.mkExpr(CVC4::kind::LT, arguments[0], arguments[1]);
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else if (n == "<=")
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return m_context.mkExpr(CVC4::kind::LEQ, arguments[0], arguments[1]);
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else if (n == ">")
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return m_context.mkExpr(CVC4::kind::GT, arguments[0], arguments[1]);
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else if (n == ">=")
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return m_context.mkExpr(CVC4::kind::GEQ, arguments[0], arguments[1]);
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else if (n == "+")
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return m_context.mkExpr(CVC4::kind::PLUS, arguments[0], arguments[1]);
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else if (n == "-")
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return m_context.mkExpr(CVC4::kind::MINUS, arguments[0], arguments[1]);
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else if (n == "*")
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return m_context.mkExpr(CVC4::kind::MULT, arguments[0], arguments[1]);
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else if (n == "/")
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return m_context.mkExpr(CVC4::kind::INTS_DIVISION_TOTAL, arguments[0], arguments[1]);
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else if (n == "mod")
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return m_context.mkExpr(CVC4::kind::INTS_MODULUS, arguments[0], arguments[1]);
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else if (n == "bvnot")
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return m_context.mkExpr(CVC4::kind::BITVECTOR_NOT, arguments[0]);
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else if (n == "bvand")
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return m_context.mkExpr(CVC4::kind::BITVECTOR_AND, arguments[0], arguments[1]);
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else if (n == "bvor")
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return m_context.mkExpr(CVC4::kind::BITVECTOR_OR, arguments[0], arguments[1]);
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else if (n == "bvxor")
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return m_context.mkExpr(CVC4::kind::BITVECTOR_XOR, arguments[0], arguments[1]);
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else if (n == "bvshl")
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return m_context.mkExpr(CVC4::kind::BITVECTOR_SHL, arguments[0], arguments[1]);
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else if (n == "bvlshr")
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return m_context.mkExpr(CVC4::kind::BITVECTOR_LSHR, arguments[0], arguments[1]);
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else if (n == "bvashr")
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return m_context.mkExpr(CVC4::kind::BITVECTOR_ASHR, arguments[0], arguments[1]);
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else if (n == "int2bv")
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{
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size_t size = std::stoul(_expr.arguments[1].name);
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auto i2bvOp = m_context.mkConst(CVC4::IntToBitVector(static_cast<unsigned>(size)));
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// CVC4 treats all BVs as unsigned, so we need to manually apply 2's complement if needed.
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return m_context.mkExpr(
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CVC4::kind::ITE,
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m_context.mkExpr(CVC4::kind::GEQ, arguments[0], m_context.mkConst(CVC4::Rational(0))),
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m_context.mkExpr(CVC4::kind::INT_TO_BITVECTOR, i2bvOp, arguments[0]),
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m_context.mkExpr(
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CVC4::kind::BITVECTOR_NEG,
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m_context.mkExpr(CVC4::kind::INT_TO_BITVECTOR, i2bvOp, m_context.mkExpr(CVC4::kind::UMINUS, arguments[0]))
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)
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);
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}
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else if (n == "bv2int")
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{
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auto intSort = dynamic_pointer_cast<IntSort>(_expr.sort);
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smtAssert(intSort, "");
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auto nat = m_context.mkExpr(CVC4::kind::BITVECTOR_TO_NAT, arguments[0]);
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if (!intSort->isSigned)
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return nat;
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auto type = arguments[0].getType();
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smtAssert(type.isBitVector(), "");
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auto size = CVC4::BitVectorType(type).getSize();
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// CVC4 treats all BVs as unsigned, so we need to manually apply 2's complement if needed.
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auto extractOp = m_context.mkConst(CVC4::BitVectorExtract(size - 1, size - 1));
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return m_context.mkExpr(CVC4::kind::ITE,
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m_context.mkExpr(
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CVC4::kind::EQUAL,
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m_context.mkExpr(CVC4::kind::BITVECTOR_EXTRACT, extractOp, arguments[0]),
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m_context.mkConst(CVC4::BitVector(1, size_t(0)))
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),
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nat,
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m_context.mkExpr(
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CVC4::kind::UMINUS,
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m_context.mkExpr(CVC4::kind::BITVECTOR_TO_NAT, m_context.mkExpr(CVC4::kind::BITVECTOR_NEG, arguments[0]))
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)
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);
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}
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else if (n == "select")
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return m_context.mkExpr(CVC4::kind::SELECT, arguments[0], arguments[1]);
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else if (n == "store")
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return m_context.mkExpr(CVC4::kind::STORE, arguments[0], arguments[1], arguments[2]);
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else if (n == "const_array")
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{
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shared_ptr<SortSort> sortSort = std::dynamic_pointer_cast<SortSort>(_expr.arguments[0].sort);
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smtAssert(sortSort, "");
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return m_context.mkConst(CVC4::ArrayStoreAll(cvc4Sort(*sortSort->inner), arguments[1]));
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}
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else if (n == "tuple_get")
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{
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shared_ptr<TupleSort> tupleSort = std::dynamic_pointer_cast<TupleSort>(_expr.arguments[0].sort);
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smtAssert(tupleSort, "");
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CVC4::DatatypeType tt = m_context.mkTupleType(cvc4Sort(tupleSort->components));
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CVC4::Datatype const& dt = tt.getDatatype();
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size_t index = std::stoul(_expr.arguments[1].name);
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CVC4::Expr s = dt[0][index].getSelector();
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return m_context.mkExpr(CVC4::kind::APPLY_SELECTOR, s, arguments[0]);
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}
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else if (n == "tuple_constructor")
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{
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shared_ptr<TupleSort> tupleSort = std::dynamic_pointer_cast<TupleSort>(_expr.sort);
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smtAssert(tupleSort, "");
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CVC4::DatatypeType tt = m_context.mkTupleType(cvc4Sort(tupleSort->components));
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CVC4::Datatype const& dt = tt.getDatatype();
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CVC4::Expr c = dt[0].getConstructor();
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return m_context.mkExpr(CVC4::kind::APPLY_CONSTRUCTOR, c, arguments);
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}
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smtAssert(false, "");
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}
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catch (CVC4::TypeCheckingException const& _e)
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{
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smtAssert(false, _e.what());
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}
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catch (CVC4::Exception const& _e)
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{
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smtAssert(false, _e.what());
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}
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smtAssert(false, "");
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}
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CVC4::Type CVC4Interface::cvc4Sort(Sort const& _sort)
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{
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switch (_sort.kind)
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{
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case Kind::Bool:
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return m_context.booleanType();
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case Kind::Int:
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return m_context.integerType();
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case Kind::BitVector:
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return m_context.mkBitVectorType(dynamic_cast<BitVectorSort const&>(_sort).size);
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case Kind::Function:
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{
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FunctionSort const& fSort = dynamic_cast<FunctionSort const&>(_sort);
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return m_context.mkFunctionType(cvc4Sort(fSort.domain), cvc4Sort(*fSort.codomain));
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}
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case Kind::Array:
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{
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auto const& arraySort = dynamic_cast<ArraySort const&>(_sort);
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return m_context.mkArrayType(cvc4Sort(*arraySort.domain), cvc4Sort(*arraySort.range));
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}
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case Kind::Tuple:
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{
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auto const& tupleSort = dynamic_cast<TupleSort const&>(_sort);
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return m_context.mkTupleType(cvc4Sort(tupleSort.components));
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}
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default:
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break;
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}
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smtAssert(false, "");
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// Cannot be reached.
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return m_context.integerType();
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}
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vector<CVC4::Type> CVC4Interface::cvc4Sort(vector<SortPointer> const& _sorts)
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{
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vector<CVC4::Type> cvc4Sorts;
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for (auto const& _sort: _sorts)
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cvc4Sorts.push_back(cvc4Sort(*_sort));
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return cvc4Sorts;
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}
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