Revert "libctf: fix linking of non-root-visible types"

This reverts commit 87b2f673102884d7c69144c85a26ed5dbaa4f86a.

It is based on a misconception, that hidden types in the deduplicator
input should always be hidden in the output.  For cu-mapped links,
and final links following cu-mapped links, this is not true: we want
to hide inputs if they were conflicting on the output and no more.

We will reintroduce the testcase once a better fix is found.

libctf/
	PR libctf/33047
	* ctf-dedup.c (ctf_dedup_emit_type): Don't respect the nonroot flag.
	* testsuite/libctf-writable/ctf-nonroot-linking.c: Removed.
	* testsuite/libctf-writable/ctf-nonroot-linking.lk: Removed.

3 files changed, 2 insertions, 132 deletions

diff --git a/libctf/ctf-dedup.c b/libctf/ctf-dedup.c
index 174f353..e442f59 100644
--- a/libctf/ctf-dedup.c
+++ b/libctf/ctf-dedup.c
@@ -2639,7 +2639,7 @@ ctf_dedup_emit_type (const char *hval, ctf_dict_t *output, ctf_dict_t **inputs,
   int input_num = CTF_DEDUP_GID_TO_INPUT (id);
   int output_num = (uint32_t) -1;		/* 'shared' */
   int cu_mapped = *(int *)arg;
-  int isroot;
+  int isroot = 1;
   int is_conflicting;
 
   ctf_next_t *i = NULL;
@@ -2708,11 +2708,9 @@ ctf_dedup_emit_type (const char *hval, ctf_dict_t *output, ctf_dict_t **inputs,
     }
 
   name = ctf_strraw (real_input, tp->ctt_name);
-  isroot = LCTF_INFO_ISROOT (real_input, tp->ctt_info);
 
   /* Hide conflicting types, if we were asked to: also hide if a type with this
-     name already exists and is not a forward, or if this type is hidden on the
-     input.  */
+     name already exists and is not a forward.  */
   if (cu_mapped && is_conflicting)
     isroot = 0;
   else if (name
diff --git a/libctf/testsuite/libctf-writable/ctf-nonroot-linking.c b/libctf/testsuite/libctf-writable/ctf-nonroot-linking.c
deleted file mode 100644
index 6edd189..0000000
--- a/libctf/testsuite/libctf-writable/ctf-nonroot-linking.c
+++ /dev/null
@@ -1,127 +0,0 @@
-/* Make sure linking a non-root-visible type emits a non-root-visible
-   type, rather than silently promoting it to root-visible.  Do it by dumping,
-   thus also testing the {non-root sigils} you get when dumping
-   non-root-visible types.  */
-
-#include <ctf-api.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-int
-main (int argc, char *argv[])
-{
-  ctf_dict_t *in1;
-  ctf_dict_t *fp;
-  ctf_dict_t *dump_fp;
-  ctf_archive_t *arc1;
-  ctf_archive_t *final_arc;
-  ctf_sect_t s;
-  ctf_encoding_t encoding = { CTF_INT_SIGNED, 0, sizeof (char) };
-  unsigned char *buf1, *buf2;
-  size_t buf1_sz, buf2_sz;
-  ctf_dump_state_t *dump_state = NULL;
-  ctf_next_t *i = NULL;
-  int err;
-
-  /* Linking does not currently work on mingw because of an unreliable tmpfile
-     implementation on that platform (see
-     https://github.com/msys2/MINGW-packages/issues/18878).  Simply skip for
-     now.  */
-
-#ifdef __MINGW32__
-  printf ("UNSUPPORTED: platform bug breaks ctf_link\n");
-  return 0;
-#else
-
-  if ((fp = ctf_create (&err)) == NULL)
-    goto create_err;
-
-  if ((in1 = ctf_create (&err)) == NULL)
-    goto create_err;
-
-  /* A non-root addition. */
-
-  if ((ctf_add_integer (in1, CTF_ADD_NONROOT, "foo", &encoding)) == CTF_ERR)
-    {
-      fprintf (stderr, "Cannot add: %s\n", ctf_errmsg (ctf_errno (in1)));
-      return 1;
-    }
-
-  /* Write it out and read it back in, to turn it into an archive.
-     This would be unnecessary if ctf_link_add() were public :( */
-  if ((buf1 = ctf_write_mem (in1, &buf1_sz, -1)) == NULL)
-    {
-      fprintf (stderr, "Cannot serialize: %s\n", ctf_errmsg (ctf_errno (in1)));
-      return 1;
-    }
-
-  s.cts_name = "foo";
-  s.cts_data = (void *) buf1;
-  s.cts_size = buf1_sz;
-  s.cts_entsize = 64; /* Unimportant.  */
-
-  if ((arc1 = ctf_arc_bufopen (&s, NULL, NULL, &err)) == NULL)
-    goto open_err;
-
-  ctf_dict_close (in1);
-
-  /* Link!  Even a one-file link does deduplication.  */
-
-  if (ctf_link_add_ctf (fp, arc1, "a") < 0)
-    goto link_err;
-
-  if (ctf_link (fp, 0) < 0)
-    goto link_err;
-
-  /* Write it out.  We need a new buf here, because the archive is still
-     using the other buf.  */
-
-  if ((buf2 = ctf_link_write (fp, &buf2_sz, 4096)) == NULL)
-    goto link_err;
-
-  /* Read it back in.  */
-
-  s.cts_data = (void *) buf2;
-  s.cts_size = buf2_sz;
-
-  if ((final_arc = ctf_arc_bufopen (&s, NULL, NULL, &err)) == NULL)
-    goto open_err;
-
-  /* Dump the types, and search for the {sigils of non-rootedness}.  */
-  while ((dump_fp = ctf_archive_next (final_arc, &i, NULL, 0, &err)) != NULL)
-    {
-      char *dumpstr;
-
-      while ((dumpstr = ctf_dump (dump_fp, &dump_state, CTF_SECT_TYPE,
-				  NULL, NULL)) != NULL)
-	{
-	  if (strchr (dumpstr, '{') != NULL && strchr (dumpstr, '}') != NULL)
-	    printf ("Non-root type found.\n");
-	  free (dumpstr);
-	}
-      ctf_dict_close (dump_fp);
-    }
-  if (err != ECTF_NEXT_END)
-    {
-      fprintf (stderr, "Archive iteration error: %s\n", ctf_errmsg (err));
-      return 1;
-    }
-
-  ctf_arc_close (final_arc);
-  free (buf1);
-  free (buf2);
-  ctf_dict_close (fp);
-  return 0;
-
- create_err:
-  fprintf (stderr, "Cannot create: %s\n", ctf_errmsg (err));
-  return 1;
- open_err:
-  fprintf (stderr, "Cannot open: %s\n", ctf_errmsg (err));
-  return 1;
- link_err:
-  fprintf (stderr, "Cannot link: %s\n", ctf_errmsg (ctf_errno (fp)));
-  return 1;
-#endif
-}
diff --git a/libctf/testsuite/libctf-writable/ctf-nonroot-linking.lk b/libctf/testsuite/libctf-writable/ctf-nonroot-linking.lk
deleted file mode 100644
index e3edda0..0000000
--- a/libctf/testsuite/libctf-writable/ctf-nonroot-linking.lk
+++ /dev/null
@@ -1 +0,0 @@
-Non-root type found.