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Do not request proof for old z3

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This commit is contained in:
Leonardo Alt
2020-12-03 20:57:23 +01:00
parent e04cc80438
commit 4210e09d9a
3 changed files with 20 additions and 6 deletions
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libsmtutil/Z3CHCInterface.cpp
+16 -6
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@@ -33,6 +33,13 @@ Z3CHCInterface::Z3CHCInterface(optional<unsigned> _queryTimeout):
m_context(m_z3Interface->context()),
m_solver(*m_context)
{
Z3_get_version(
&get<0>(m_version),
&get<1>(m_version),
&get<2>(m_version),
&get<3>(m_version)
);
// These need to be set globally.
z3::set_param("rewriter.pull_cheap_ite", true);
@@ -73,7 +80,6 @@ void Z3CHCInterface::addRule(Expression const& _expr, string const& _name)
pair<CheckResult, CHCSolverInterface::CexGraph> Z3CHCInterface::query(Expression const& _expr)
{
CheckResult result;
CHCSolverInterface::CexGraph cex;
try
{
z3::expr z3Expr = m_z3Interface->toZ3Expr(_expr);
@@ -82,9 +88,14 @@ pair<CheckResult, CHCSolverInterface::CexGraph> Z3CHCInterface::query(Expression
case z3::check_result::sat:
{
result = CheckResult::SATISFIABLE;
auto proof = m_solver.get_answer();
auto cex = cexGraph(proof);
return {result, cex};
// z3 version 4.8.8 modified Spacer to also return
// proofs containing nonlinear clauses.
if (m_version >= tuple(4, 8, 8, 0))
{
auto proof = m_solver.get_answer();
return {result, cexGraph(proof)};
}
break;
}
case z3::check_result::unsat:
{
@@ -112,10 +123,9 @@ pair<CheckResult, CHCSolverInterface::CexGraph> Z3CHCInterface::query(Expression
result = CheckResult::UNKNOWN;
else
result = CheckResult::ERROR;
cex = {};
}
return {result, cex};
return {result, {}};
}
void Z3CHCInterface::setSpacerOptions(bool _preProcessing)