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use rustc_middle::ty::{self, layout::TyAndLayout};
use rustc_target::abi::Size;
// FIXME(eddyb) find a place for this (or a way to replace it).
pub mod type_names;
/// Returns true if we want to generate a DW_TAG_enumeration_type description for
/// this instead of a DW_TAG_struct_type with DW_TAG_variant_part.
///
/// NOTE: This is somewhat inconsistent right now: For empty enums and enums with a single
/// fieldless variant, we generate DW_TAG_struct_type, although a
/// DW_TAG_enumeration_type would be a better fit.
pub fn wants_c_like_enum_debuginfo<'tcx>(enum_type_and_layout: TyAndLayout<'tcx>) -> bool {
match enum_type_and_layout.ty.kind() {
ty::Adt(adt_def, _) => {
if !adt_def.is_enum() {
return false;
}
match adt_def.variants().len() {
0 => false,
1 => {
// Univariant enums unless they are zero-sized
enum_type_and_layout.size != Size::ZERO && adt_def.all_fields().count() == 0
}
_ => {
// Enums with more than one variant if they have no fields
adt_def.all_fields().count() == 0
}
}
}
_ => false,
}
}
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