libctf: create: forwards are always in the namespace of their referent

The C namespace a forward is located in is always the same as the
namespace of the corresponding complete type: 'struct foo' is in the
struct namespace and does not collide with, say, 'union foo'.

libctf allowed for this in many places, but inconsistently: in
particular, forward *addition* never allowed for this, and was interning
forwards in the default namespace, which is always wrong, since you can
only forward structs, unions and enums, all of which are in their own
namespaces in C.

Forward removal needs corresponding adjustment to remove the names form
the right namespace, as does ctf_rollback.

libctf/
	* ctf-create.c (ctf_add_forward): Intern in the right namespace.
	(ctf_dtd_delete): Remove correspondingly.
	(ctf_rollback): Likewise.

1 files changed, 8 insertions, 2 deletions

diff --git a/libctf/ctf-create.c b/libctf/ctf-create.c
index 7e94a254c50..a01250bc4d4 100644
--- a/libctf/ctf-create.c
+++ b/libctf/ctf-create.c
@@ -622,6 +622,7 @@ ctf_dtd_delete (ctf_file_t *fp, ctf_dtdef_t *dtd)
 {
   ctf_dmdef_t *dmd, *nmd;
   int kind = LCTF_INFO_KIND (fp, dtd->dtd_data.ctt_info);
+  int name_kind = kind;
   const char *name;
 
   ctf_dynhash_remove (fp->ctf_dthash, (void *) dtd->dtd_type);
@@ -643,13 +644,16 @@ ctf_dtd_delete (ctf_file_t *fp, ctf_dtdef_t *dtd)
     case CTF_K_FUNCTION:
       free (dtd->dtd_u.dtu_argv);
       break;
+    case CTF_K_FORWARD:
+      name_kind = dtd->dtd_data.ctt_type;
+      break;
     }
 
   if (dtd->dtd_data.ctt_name
       && (name = ctf_strraw (fp, dtd->dtd_data.ctt_name)) != NULL
       && LCTF_INFO_ISROOT (fp, dtd->dtd_data.ctt_info))
     {
-      ctf_dynhash_remove (ctf_name_table (fp, kind)->ctn_writable,
+      ctf_dynhash_remove (ctf_name_table (fp, name_kind)->ctn_writable,
 			  name);
       ctf_str_remove_ref (fp, name, &dtd->dtd_data.ctt_name);
     }
@@ -761,6 +765,8 @@ ctf_rollback (ctf_file_t *fp, ctf_snapshot_id_t id)
 	continue;
 
       kind = LCTF_INFO_KIND (fp, dtd->dtd_data.ctt_info);
+      if (kind == CTF_K_FORWARD)
+	kind = dtd->dtd_data.ctt_type;
 
       if (dtd->dtd_data.ctt_name
 	  && (name = ctf_strraw (fp, dtd->dtd_data.ctt_name)) != NULL
@@ -1232,7 +1238,7 @@ ctf_add_forward (ctf_file_t *fp, uint32_t flag, const char *name,
   if (type)
     return type;
 
-  if ((type = ctf_add_generic (fp, flag, name, CTF_K_FORWARD, &dtd)) == CTF_ERR)
+  if ((type = ctf_add_generic (fp, flag, name, kind, &dtd)) == CTF_ERR)
     return CTF_ERR;		/* errno is set for us.  */
 
   dtd->dtd_data.ctt_info = CTF_TYPE_INFO (CTF_K_FORWARD, flag, 0);