bool has_byte_operator(const exprt &src)
{
if(src.id()==ID_byte_update_little_endian ||
src.id()==ID_byte_update_big_endian ||
src.id()==ID_byte_extract_little_endian ||
src.id()==ID_byte_extract_big_endian)
return true;
forall_operands(it, src)
if(has_byte_operator(*it)) return true;
return false;
}
literalt boolbvt::convert_equality(const equal_exprt &expr)
{
if(!base_type_eq(expr.lhs().type(), expr.rhs().type(), ns))
{
std::cout << "######### lhs: " << expr.lhs().pretty() << '\n';
std::cout << "######### rhs: " << expr.rhs().pretty() << '\n';
throw "equality without matching types";
}
// see if it is an unbounded array
if(is_unbounded_array(expr.lhs().type()))
{
// flatten byte_update/byte_extract operators if needed
if(has_byte_operator(expr))
{
exprt tmp=flatten_byte_operators(expr, ns);
return record_array_equality(to_equal_expr(tmp));
}
return record_array_equality(expr);
}
const bvt &bv0=convert_bv(expr.lhs());
const bvt &bv1=convert_bv(expr.rhs());
if(bv0.size()!=bv1.size())
{
std::cerr << "lhs: " << expr.lhs().pretty() << '\n';
std::cerr << "lhs size: " << bv0.size() << '\n';
std::cerr << "rhs: " << expr.rhs().pretty() << '\n';
std::cerr << "rhs size: " << bv1.size() << '\n';
throw "unexpected size mismatch on equality";
}
if(bv0.empty())
{
// An empty bit-vector comparison. It's not clear
// what this is meant to say.
return prop.new_variable();
}
return bv_utils.equal(bv0, bv1);
}