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SMT2: skip element enumeration for non-integer-keyed array literals #9062

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SMT2: skip element enumeration for non-integer-keyed array literals #9062

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12 changes: 11 additions & 1 deletion src/solvers/smt2/smt2_conv.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5617,7 +5617,17 @@ void smt2_convt::find_symbols(const exprt &expr)
convert_type(array_type);
out << ")" << "\n";

if(!is_zero_width(array_type.element_type(), ns))
// Per-element constraints enumerate indices via from_integer(i,
// index_type); this is only possible for integer/bitvector index types.
// For arrays keyed by a non-scalar type (e.g. Strata's `Map Ref _`), we
// leave the array unconstrained (sound over-approximation).
const typet &idx_t = array_type.index_type();
const bool int_index =
idx_t.id() == ID_unsignedbv || idx_t.id() == ID_signedbv ||
idx_t.id() == ID_bv || idx_t.id() == ID_integer ||
idx_t.id() == ID_c_enum || idx_t.id() == ID_c_enum_tag ||
idx_t.id() == ID_c_bool;
Comment on lines +5624 to +5629
Comment on lines +5625 to +5629
if(!is_zero_width(array_type.element_type(), ns) && int_index)
{
for(std::size_t i = 0; i < expr.operands().size(); i++)
{
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