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libctf: create: addition of non-root types should not return root types

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If you add a non-root type to a dict, you should always get a new, unique
type ID back, even if a root-visible type with the same name already exists.
Unfortunately, if the root-visible type is a forward, and you're adding a
non-root-visible struct, union, or enum, the machinery to detect forwards
and promote them to the concrete type fires in this case and returns the
root-visible type!  If this is an enum being inserted hidden because its
enumerands conflict with some other enum, this will lead to failure later
on: in any case, it's seriously counterintuitive to add a non-root- visible
type and get a root-visible one instead.

Fix this by checking the root-visible flag properly and only checking for
forwards if this type is root-visible.  (This may lead to a certain degree
of proliferation of non-root-visible forwards: we can add a cleanup pass for
those later if needed.)

libctf/
	* ctf-create.c (ctf_add_struct_sized): Check the root-visible flag when
	doing forward promotion.
	(ctf_add_union_sized): Likewise.
	(ctf_add_enum): Likewise.

Reviewed-by: Bruce McCulloch <bruce.mcculloch@oracle.com>
This commit is contained in:
Nick Alcock
2025-06-26 15:45:31 +01:00
parent a17dd69b33
commit 84b2be94e5
1 changed files with 3 additions and 3 deletions
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6
libctf/ctf-create.c
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@@ -788,7 +788,7 @@ ctf_add_struct_sized (ctf_dict_t *fp, uint32_t flag, const char *name,
size_t initial_vlen = sizeof (ctf_lmember_t) * INITIAL_VLEN;
/* Promote root-visible forwards to structs. */
if (name != NULL)
if (name != NULL && flag == CTF_ADD_ROOT)
type = ctf_lookup_by_rawname (fp, CTF_K_STRUCT, name);
/* Prohibit promotion if this type was ctf_open()ed. */
@@ -832,7 +832,7 @@ ctf_add_union_sized (ctf_dict_t *fp, uint32_t flag, const char *name,
size_t initial_vlen = sizeof (ctf_lmember_t) * INITIAL_VLEN;
/* Promote root-visible forwards to unions. */
if (name != NULL)
if (name != NULL && flag == CTF_ADD_ROOT)
type = ctf_lookup_by_rawname (fp, CTF_K_UNION, name);
/* Prohibit promotion if this type was ctf_open()ed. */
@@ -875,7 +875,7 @@ ctf_add_enum (ctf_dict_t *fp, uint32_t flag, const char *name)
size_t initial_vlen = sizeof (ctf_enum_t) * INITIAL_VLEN;
/* Promote root-visible forwards to enums. */
if (name != NULL)
if (name != NULL && flag == CTF_ADD_ROOT)
type = ctf_lookup_by_rawname (fp, CTF_K_ENUM, name);
/* Prohibit promotion if this type was ctf_open()ed. */