libctf, ld: more dumper improvements

Dump more details about the types found in data object and function info
sections (the type ID and recursive info on the type itself, but not on
its members).  Before now, this was being dumped for entries in the
variable section, but not for the closely-related function info and data
object sections, which is inconsistent and makes finding the
corresponding types in the type section unnecessarily hard.  (This also
gets rid of code in which bugs have already been found in favour of the
same code everything else in the dumper uses to dump types.)

While we're doing that, change the recursive type dumper in question to
recursively dump info on arrays' element type, just as we do for all
types that reference other types. (Arrays are not a kind of reference
type in libctf, but perhaps we should change that in future and make
ctf_type_reference return the element type.)

ld/ChangeLog
2021-01-05  Nick Alcock  <nick.alcock@oracle.com>

	* testsuite/ld-ctf/array.d: Adjust for dumper changes.
	* testsuite/ld-ctf/data-func-conflicted.d: Likewise.
	* testsuite/ld-ctf/diag-cttname-null.d: Likewise.
	* testsuite/ld-ctf/diag-cuname.d: Likewise.
	* testsuite/ld-ctf/diag-parlabel.d: Likewise.
	* testsuite/ld-ctf/function.d: Likewise.
	* testsuite/ld-ctf/slice.d: Likewise.

libctf/ChangeLog
2021-01-05  Nick Alcock  <nick.alcock@oracle.com>

	* ctf-dump.c (ctf_dump_objts): Dump by calling ctf_dump_format_type.
	(ctf_dump_format_type): Don't emit the size for function objects.
	Dump the element type of arrays like we dump the pointed-to type of
	pointers, etc.

1 files changed, 33 insertions, 37 deletions

diff --git a/libctf/ctf-dump.c b/libctf/ctf-dump.c
index ee22f77..f01f225 100644
--- a/libctf/ctf-dump.c
+++ b/libctf/ctf-dump.c
@@ -93,6 +93,8 @@ ctf_dump_format_type (ctf_dict_t *fp, ctf_id_t id, int flag)
   do
     {
       ctf_encoding_t enc;
+      ctf_arinfo_t ar;
+      int kind, unsliced_kind;
       const char *nonroot_leader = "";
       const char *nonroot_trailer = "";
 
@@ -123,26 +125,25 @@ ctf_dump_format_type (ctf_dict_t *fp, ctf_id_t id, int flag)
       bit = NULL;
 
       if (buf[0] != '\0')
-	{
-	  str = str_append (str, buf);
-	  str = str_append (str, " ");
-	}
+	str = str_append (str, buf);
 
       free (buf);
       buf = NULL;
+      unsliced_kind = ctf_type_kind_unsliced (fp, id);
+      kind = ctf_type_kind (fp, id);
 
       /* Slices get a different print representation.  */
-      if (ctf_type_kind_unsliced (fp, id) == CTF_K_SLICE)
+      if (unsliced_kind == CTF_K_SLICE)
 	{
 	  ctf_type_encoding (fp, id, &enc);
-	  if (asprintf (&bit, "[slice 0x%x:0x%x] ",
+	  if (asprintf (&bit, " [slice 0x%x:0x%x]",
 			enc.cte_offset, enc.cte_bits) < 0)
 	    goto oom;
 	}
-      else if (ctf_type_kind (fp, id) == CTF_K_INTEGER)
+      else if (kind == CTF_K_INTEGER)
 	{
 	  ctf_type_encoding (fp, id, &enc);
-	  if (asprintf (&bit, "[0x%x:0x%x] ",
+	  if (asprintf (&bit, " [0x%x:0x%x]",
 			enc.cte_offset, enc.cte_bits) < 0)
 	    goto oom;
 	}
@@ -150,16 +151,27 @@ ctf_dump_format_type (ctf_dict_t *fp, ctf_id_t id, int flag)
       free (bit);
       bit = NULL;
 
-      if (asprintf (&bit, "(size 0x%lx)%s",
-		    (unsigned long) ctf_type_size (fp, id),
-		    nonroot_trailer) < 0)
-	goto oom;
+      if (kind != CTF_K_FUNCTION)
+	if (asprintf (&bit, " (size 0x%lx)%s",
+		      (unsigned long) ctf_type_size (fp, id),
+		      nonroot_trailer) < 0)
+	  goto oom;
 
       str = str_append (str, bit);
       free (bit);
       bit = NULL;
 
-      new_id = ctf_type_reference (fp, id);
+      /* Keep going as long as this type references another.  We consider arrays
+	 to "reference" their element type. */
+
+      if (kind == CTF_K_ARRAY)
+	{
+	  if (ctf_array_info (fp, id, &ar) < 0)
+	    goto err;
+	  new_id = ar.ctr_contents;
+	}
+      else
+	new_id = ctf_type_reference (fp, id);
       if (new_id != CTF_ERR)
 	str = str_append (str, " ->");
     } while (new_id != CTF_ERR);
@@ -383,36 +395,26 @@ ctf_dump_objts (ctf_dict_t *fp, ctf_dump_state_t *state, int functions)
   while ((id = ctf_symbol_next (fp, &i, &name, functions)) != CTF_ERR)
     {
       char *typestr = NULL;
-      int err = 0;
 
-      /* Emit the name, if we know it.  */
+      /* Emit the name, if we know it.  No trailing space: ctf_dump_format_type
+	 has a leading one.   */
       if (name)
 	{
-	  if (asprintf (&str, "%s -> ", name) < 0)
+	  if (asprintf (&str, "%s ->", name) < 0)
 	    goto oom;
 	}
       else
 	str = xstrdup ("");
 
-      if ((typestr = ctf_type_aname (fp, id)) == NULL)
+      if ((typestr = ctf_dump_format_type (state->cds_fp, id,
+					   CTF_ADD_ROOT)) == NULL)
 	{
-	  if (id == 0 || ctf_errno (fp) == ECTF_NONREPRESENTABLE)
-	    {
-	      if (asprintf (&typestr, " (%s)", _("type not represented in CTF")) < 0)
-		goto oom;
-
-	      goto out;
-	    }
-
-	  if (asprintf (&typestr, _("error: %s"), ctf_errmsg (ctf_errno (fp))) < 0)
-	    goto oom;
-
-	  err = -1;
-	  goto out;
+	  ctf_dump_append (state, str);
+	  continue;				/* Swallow the error.  */
 	}
 
       str = str_append (str, typestr);
-      str = str_append (str, "\n");
+      free (typestr);
       ctf_dump_append (state, str);
       continue;
 
@@ -420,12 +422,6 @@ ctf_dump_objts (ctf_dict_t *fp, ctf_dump_state_t *state, int functions)
       ctf_set_errno (fp, ENOMEM);
       ctf_next_destroy (i);
       return -1;
-    out:
-      str = str_append (str, typestr);
-      free (typestr);
-      ctf_dump_append (state, str);
-      ctf_next_destroy (i);
-      return err;				/* errno is set for us.  */
     }
   return 0;
 }