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SMT2: parse values of bit-fields #9278

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15 changes: 15 additions & 0 deletions regression/cbmc/smt2-bitfield-trace/main.c
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
unsigned nondet_u(void);
struct S
{
unsigned bf : 3;
unsigned other;
};
int main(void)
{
struct S s;
s.bf = nondet_u();
s.other = 7;
__CPROVER_assume(s.bf == 5);
__CPROVER_assert(0, "show trace");
return 0;
}
10 changes: 10 additions & 0 deletions regression/cbmc/smt2-bitfield-trace/test.desc
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
CORE no-new-smt
main.c
--trace --z3
^EXIT=10$
^SIGNAL=0$
^ s\.bf=5u
^VERIFICATION FAILED$
--
^warning: ignoring
assignment removed
10 changes: 10 additions & 0 deletions src/solvers/smt2/smt2_conv.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -789,6 +789,16 @@ exprt smt2_convt::parse_rec(const irept &src, const typet &type)
{
return parse_literal(src, type);
}
else if(type.id() == ID_c_bit_field)
{
// bit-fields are bit vectors of their width: parse them using the
// corresponding integer type
exprt result = parse_rec(
src, c_bit_field_replacement_type(to_c_bit_field_type(type), ns));
if(result.is_not_nil())
result.type() = type;
return result;
}
else if(type.id()==ID_bool)
{
if(src.id()==ID_1 || src.id()==ID_true)
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