Michael137 wrote:
> (hmm, can't use the foundation library on godbolt/compiler explorer) Can you
> show a small example of the code you're interested in and the DWARF it
> produces? The documentation I can find seems to suggest that the extensible
> enums have ctors that take the underlying integer type, but the
> non-extensible ones don't, so I'd have thought that might be adequate to
> differentiate without an extra attribute?
`NS_ENUM` is just a `#define` that adds the `enum_extensibility(open)`
attribute to a plain C enum. Given following example:
```
#import <Foundation/Foundation.h>
enum Enum {
e1
} e;
enum class EnumClass : unsigned {
ec1
} ec;
enum __attribute__((enum_extensibility(open))) OpenEnum {
oe1
} oe;
enum __attribute__((enum_extensibility(open))) OpenEnumClass : unsigned {
oec1
} oec;
typedef NS_ENUM(unsigned, ns_enum) {
ns1
} ns;
```
Here are all the `DW_TAG_enumeration_type`s:
```
0x0000002c: DW_TAG_enumeration_type
DW_AT_type (0x00000039 "unsigned int")
DW_AT_name ("Enum")
DW_AT_byte_size (0x04)
DW_AT_decl_file ("/Users/michaelbuch/ns_enum.m")
DW_AT_decl_line (3)
0x00000035: DW_TAG_enumerator
DW_AT_name ("e1")
DW_AT_const_value (0)
0x00000048: DW_TAG_enumeration_type
DW_AT_type (0x00000039 "unsigned int")
DW_AT_enum_class (true)
DW_AT_name ("EnumClass")
DW_AT_byte_size (0x04)
DW_AT_decl_file ("/Users/michaelbuch/ns_enum.m")
DW_AT_decl_line (7)
0x00000051: DW_TAG_enumerator
DW_AT_name ("ec1")
DW_AT_const_value (0)
0x00000060: DW_TAG_enumeration_type
DW_AT_type (0x00000039 "unsigned int")
DW_AT_name ("OpenEnum")
DW_AT_byte_size (0x04)
DW_AT_decl_file ("/Users/michaelbuch/ns_enum.m")
DW_AT_decl_line (11)
0x00000069: DW_TAG_enumerator
DW_AT_name ("oe1")
DW_AT_const_value (0)
0x00000078: DW_TAG_enumeration_type
DW_AT_type (0x00000039 "unsigned int")
DW_AT_enum_class (true)
DW_AT_name ("OpenEnumClass")
DW_AT_byte_size (0x04)
DW_AT_decl_file ("/Users/michaelbuch/ns_enum.m")
DW_AT_decl_line (15)
0x00000081: DW_TAG_enumerator
DW_AT_name ("oec1")
DW_AT_const_value (0)
0x00000090: DW_TAG_enumeration_type
DW_AT_type (0x00000039 "unsigned int")
DW_AT_name ("ns_enum")
DW_AT_byte_size (0x04)
DW_AT_decl_file ("/Users/michaelbuch/ns_enum.m")
DW_AT_decl_line (19)
0x00000099: DW_TAG_enumerator
DW_AT_name ("ns1")
DW_AT_const_value (0)
```
So nothing about the extensibility is reflected here
https://github.com/llvm/llvm-project/pull/124752
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