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Smt unknown handling #6221

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Merged
merged 2 commits into from
Jul 9, 2021
Merged

Smt unknown handling #6221

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dc975d5
Add handling of "unknown" SMT outcome
TGWDB Jul 9, 2021
141f3ce
Add regression test for SMT unknown result
TGWDB Jul 9, 2021
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11 changes: 11 additions & 0 deletions regression/cbmc/z3/Issue5977.c
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
#include <assert.h>

void main()
{
int i;
__CPROVER_assume(i % 2 == 0);
assert(__CPROVER_exists {
int j;
i == j + j
});
}
9 changes: 9 additions & 0 deletions regression/cbmc/z3/Issue5977.desc
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@@ -0,0 +1,9 @@
CORE smt-backend broken-cprover-smt-backend
Issue5977.c
--z3
^EXIT=(6|10)$
^SIGNAL=0$
^SMT2 solver returned "unknown"$
--
--
This tests that an "unknown" result from the SMT solver is reported.
6 changes: 6 additions & 0 deletions src/solvers/smt2/smt2_dec.cpp
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Expand Up @@ -154,6 +154,12 @@ decision_proceduret::resultt smt2_dect::read_result(std::istream &in)
res=resultt::D_SATISFIABLE;
else if(parsed.id()=="unsat")
res=resultt::D_UNSATISFIABLE;
else if(parsed.id() == "unknown")
{
messaget log{message_handler};
log.error() << "SMT2 solver returned \"unknown\"" << messaget::eom;
return decision_proceduret::resultt::D_ERROR;
}
else if(
parsed.id().empty() && parsed.get_sub().size() == 1 &&
parsed.get_sub().front().get_sub().size() == 2)
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