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Double SAT run for cex

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This commit is contained in:
Leonardo Alt
2020-07-23 18:49:03 +02:00
parent 694ec92688
commit 51721c3080
3 changed files with 64 additions and 12 deletions
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libsolidity/formal/CHC.cpp
+18
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@@ -1128,7 +1128,25 @@ pair<smtutil::CheckResult, CHCSolverInterface::CexGraph> CHC::query(smtutil::Exp
switch (result)
{
case smtutil::CheckResult::SATISFIABLE:
{
#ifdef HAVE_Z3
// Even though the problem is SAT, Spacer's pre processing makes counterexamples incomplete.
// We now disable those optimizations and check whether we can still solve the problem.
auto* spacer = dynamic_cast<Z3CHCInterface*>(m_interface.get());
solAssert(spacer, "");
spacer->disablePreProcessing();
smtutil::CheckResult resultNoOpt;
CHCSolverInterface::CexGraph cexNoOpt;
tie(resultNoOpt, cexNoOpt) = m_interface->query(_query);
if (resultNoOpt == smtutil::CheckResult::SATISFIABLE)
cex = move(cexNoOpt);
spacer->enablePreProcessing();
#endif
break;
}
case smtutil::CheckResult::UNSATISFIABLE:
break;
case smtutil::CheckResult::UNKNOWN: