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libctf: support encodings for enums

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The previous commit started to error-check the lookup of
ctf_type_encoding for the underlying type that is internally done when
carrying out a ctf_type_encoding on a slice.

Unfortunately, enums have no encoding, so this has historically been
returning an error (which is ignored) and then populating the cte_format
with uninitialized data.  Now the error is not ignored, this is
returning an error, which breaks linking of CTF containing bitfields of
enumerated type.

CTF format v3 does not record the actual underlying type of a enum, but
we can mock up something that is not *too* wrong, and that is at any
rate better than uninitialized data.

ld/ChangeLog
2021-03-18  Nick Alcock  <nick.alcock@oracle.com>

	* testsuite/ld-ctf/slice.c: Check slices of enums too.
	* testsuite/ld-ctf/slice.d: Results adjusted.

libctf/ChangeLog
2021-03-18  Nick Alcock  <nick.alcock@oracle.com>

	* ctf-types.c (ctf_type_encoding): Support, after a fashion, for enums.
	* ctf-dump.c (ctf_dump_format_type): Do not report enums' degenerate
	encoding.
This commit is contained in:
Nick Alcock 2021-03-18 12:37:52 +00:00
parent e4c78f303d
commit 69a284867c
6 changed files with 27 additions and 4 deletions
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8
libctf/ctf-types.c
View file

@ -1157,7 +1157,7 @@ ctf_type_pointer (ctf_dict_t *fp, ctf_id_t type)
return (ctf_set_errno (ofp, ECTF_NOTYPE));
}
/* Return the encoding for the specified INTEGER or FLOAT. */
/* Return the encoding for the specified INTEGER, FLOAT, or ENUM. */
int
ctf_type_encoding (ctf_dict_t *fp, ctf_id_t type, ctf_encoding_t *ep)
@ -1194,6 +1194,12 @@ ctf_type_encoding (ctf_dict_t *fp, ctf_id_t type, ctf_encoding_t *ep)
ep->cte_offset = CTF_FP_OFFSET (data);
ep->cte_bits = CTF_FP_BITS (data);
break;
case CTF_K_ENUM:
/* v3 only: we must guess at the underlying integral format. */
ep->cte_format = CTF_INT_SIGNED;
ep->cte_offset = 0;
ep->cte_bits = 0;
break;
case CTF_K_SLICE:
{
const ctf_slice_t *slice;