solidity/libsolidity/formal/SMTLib2Interface.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/SMTLib2Interface.h>
#include <liblangutil/Exceptions.h>
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#include <libsolidity/interface/ReadFile.h>
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#include <libdevcore/Keccak256.h>
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#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/join.hpp>
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#include <boost/filesystem/operations.hpp>
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#include <cstdio>
#include <fstream>
#include <iostream>
#include <memory>
#include <stdexcept>
#include <string>
#include <array>
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using namespace std;
using namespace dev;
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using namespace dev::solidity;
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using namespace dev::solidity::smt;
SMTLib2Interface::SMTLib2Interface(map<h256, string> const& _queryResponses):
m_queryResponses(_queryResponses)
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{
reset();
}
void SMTLib2Interface::reset()
{
m_accumulatedOutput.clear();
m_accumulatedOutput.emplace_back();
m_variables.clear();
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write("(set-option :produce-models true)");
write("(set-logic QF_UFLIA)");
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}
void SMTLib2Interface::push()
{
m_accumulatedOutput.emplace_back();
}
void SMTLib2Interface::pop()
{
solAssert(!m_accumulatedOutput.empty(), "");
m_accumulatedOutput.pop_back();
}
void SMTLib2Interface::declareVariable(string const& _name, Sort const& _sort)
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{
if (_sort.kind == Kind::Function)
declareFunction(_name, _sort);
else if (!m_variables.count(_name))
{
m_variables.insert(_name);
write("(declare-fun |" + _name + "| () " + toSmtLibSort(_sort) + ')');
}
}
void SMTLib2Interface::declareFunction(string const& _name, Sort const& _sort)
{
solAssert(_sort.kind == smt::Kind::Function, "");
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// TODO Use domain and codomain as key as well
if (!m_variables.count(_name))
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{
FunctionSort fSort = dynamic_cast<FunctionSort const&>(_sort);
string domain = toSmtLibSort(fSort.domain);
string codomain = toSmtLibSort(*fSort.codomain);
m_variables.insert(_name);
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write(
"(declare-fun |" +
_name +
"| " +
domain +
" " +
codomain +
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")"
);
}
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}
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void SMTLib2Interface::addAssertion(Expression const& _expr)
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{
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write("(assert " + toSExpr(_expr) + ")");
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}
pair<CheckResult, vector<string>> SMTLib2Interface::check(vector<Expression> const& _expressionsToEvaluate)
{
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string response = querySolver(
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boost::algorithm::join(m_accumulatedOutput, "\n") +
checkSatAndGetValuesCommand(_expressionsToEvaluate)
);
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CheckResult result;
// TODO proper parsing
if (boost::starts_with(response, "sat\n"))
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result = CheckResult::SATISFIABLE;
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else if (boost::starts_with(response, "unsat\n"))
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result = CheckResult::UNSATISFIABLE;
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else if (boost::starts_with(response, "unknown\n"))
result = CheckResult::UNKNOWN;
else
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result = CheckResult::ERROR;
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vector<string> values;
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if (result == CheckResult::SATISFIABLE && result != CheckResult::ERROR)
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values = parseValues(find(response.cbegin(), response.cend(), '\n'), response.cend());
return make_pair(result, values);
}
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string SMTLib2Interface::toSExpr(Expression const& _expr)
{
if (_expr.arguments.empty())
return _expr.name;
std::string sexpr = "(" + _expr.name;
for (auto const& arg: _expr.arguments)
sexpr += " " + toSExpr(arg);
sexpr += ")";
return sexpr;
}
string SMTLib2Interface::toSmtLibSort(Sort const& _sort)
{
switch (_sort.kind)
{
case Kind::Int:
return "Int";
case Kind::Bool:
return "Bool";
case Kind::Array:
{
auto const& arraySort = dynamic_cast<ArraySort const&>(_sort);
return "(Array " + toSmtLibSort(*arraySort.domain) + ' ' + toSmtLibSort(*arraySort.range) + ')';
}
default:
solAssert(false, "Invalid SMT sort");
}
}
string SMTLib2Interface::toSmtLibSort(vector<SortPointer> const& _sorts)
{
string ssort("(");
for (auto const& sort: _sorts)
ssort += toSmtLibSort(*sort) + " ";
ssort += ")";
return ssort;
}
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void SMTLib2Interface::write(string _data)
{
solAssert(!m_accumulatedOutput.empty(), "");
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m_accumulatedOutput.back() += move(_data) + "\n";
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}
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string SMTLib2Interface::checkSatAndGetValuesCommand(vector<Expression> const& _expressionsToEvaluate)
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{
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string command;
if (_expressionsToEvaluate.empty())
command = "(check-sat)\n";
else
{
// TODO make sure these are unique
for (size_t i = 0; i < _expressionsToEvaluate.size(); i++)
{
auto const& e = _expressionsToEvaluate.at(i);
solAssert(e.sort->kind == Kind::Int || e.sort->kind == Kind::Bool, "Invalid sort for expression to evaluate.");
command += "(declare-const |EVALEXPR_" + to_string(i) + "| " + (e.sort->kind == Kind::Int ? "Int" : "Bool") + ")\n";
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command += "(assert (= |EVALEXPR_" + to_string(i) + "| " + toSExpr(e) + "))\n";
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}
command += "(check-sat)\n";
command += "(get-value (";
for (size_t i = 0; i < _expressionsToEvaluate.size(); i++)
command += "|EVALEXPR_" + to_string(i) + "| ";
command += "))\n";
}
return command;
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}
vector<string> SMTLib2Interface::parseValues(string::const_iterator _start, string::const_iterator _end)
{
vector<string> values;
while (_start < _end)
{
auto valStart = find(_start, _end, ' ');
if (valStart < _end)
++valStart;
auto valEnd = find(valStart, _end, ')');
values.emplace_back(valStart, valEnd);
_start = find(valEnd, _end, '(');
}
return values;
}
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string SMTLib2Interface::querySolver(string const& _input)
{
h256 inputHash = dev::keccak256(_input);
if (m_queryResponses.count(inputHash))
return m_queryResponses.at(inputHash);
else
{
m_unhandledQueries.push_back(_input);
return "unknown\n";
}
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}