mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
112 lines
3.0 KiB
C++
112 lines
3.0 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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#include <libsolidity/formal/Z3CHCInterface.h>
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#include <liblangutil/Exceptions.h>
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#include <libsolutil/CommonIO.h>
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using namespace std;
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using namespace solidity;
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using namespace solidity::frontend::smt;
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Z3CHCInterface::Z3CHCInterface():
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m_z3Interface(make_unique<Z3Interface>()),
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m_context(m_z3Interface->context()),
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m_solver(*m_context)
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{
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// These need to be set globally.
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z3::set_param("rewriter.pull_cheap_ite", true);
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z3::set_param("rlimit", Z3Interface::resourceLimit);
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// Spacer options.
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// These needs to be set in the solver.
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// https://github.com/Z3Prover/z3/blob/master/src/muz/base/fp_params.pyg
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z3::params p(*m_context);
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// These are useful for solving problems with arrays and loops.
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// Use quantified lemma generalizer.
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p.set("fp.spacer.q3.use_qgen", true);
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p.set("fp.spacer.mbqi", false);
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// Ground pobs by using values from a model.
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p.set("fp.spacer.ground_pobs", false);
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m_solver.set(p);
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}
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void Z3CHCInterface::declareVariable(string const& _name, SortPointer const& _sort)
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{
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solAssert(_sort, "");
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m_z3Interface->declareVariable(_name, _sort);
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}
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void Z3CHCInterface::registerRelation(Expression const& _expr)
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{
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m_solver.register_relation(m_z3Interface->functions().at(_expr.name));
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}
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void Z3CHCInterface::addRule(Expression const& _expr, string const& _name)
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{
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z3::expr rule = m_z3Interface->toZ3Expr(_expr);
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if (m_z3Interface->constants().empty())
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m_solver.add_rule(rule, m_context->str_symbol(_name.c_str()));
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else
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{
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z3::expr_vector variables(*m_context);
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for (auto const& var: m_z3Interface->constants())
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variables.push_back(var.second);
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z3::expr boundRule = z3::forall(variables, rule);
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m_solver.add_rule(boundRule, m_context->str_symbol(_name.c_str()));
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}
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}
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pair<CheckResult, vector<string>> Z3CHCInterface::query(Expression const& _expr)
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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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z3::expr z3Expr = m_z3Interface->toZ3Expr(_expr);
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switch (m_solver.query(z3Expr))
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{
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case z3::check_result::sat:
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{
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result = CheckResult::SATISFIABLE;
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// TODO retrieve model.
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break;
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}
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case z3::check_result::unsat:
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{
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result = CheckResult::UNSATISFIABLE;
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// TODO retrieve invariants.
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break;
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}
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case z3::check_result::unknown:
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{
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result = CheckResult::UNKNOWN;
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break;
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}
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}
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// TODO retrieve model / invariants
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}
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catch (z3::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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