perf annotate-data: Show typedef names properly

The die_get_typename() would resolve typedef and get to the original
type.  But sometimes the original type is a struct without name and it
makes the output confusing and hard to read.

This is a diff of perf report -s type before and after the change.
New types such as atomic{,64}_t and sigset_t appeared and the portion
of unnamed struct was reduced.  Also u32, u64 and size_t were splitted
from the base types.

  --- b   2024-08-01 17:02:34.307809952 -0700
  +++ a   2024-08-07 14:17:05.245853999 -0700
  -     2.40%  long unsigned int
  +     2.26%  long unsigned int
  -     1.56%  unsigned int
  +     1.27%  unsigned int
  -     0.98%  struct
  -     0.79%  long long unsigned int
  +     0.58%  long long unsigned int
  +     0.36%  struct
  +     0.27%  atomic64_t
  +     0.22%  u32
  +     0.21%  u64
  +     0.19%  atomic_t
  +     0.13%  size_t
  -     0.08%  struct seqcount_spinlock
  +     0.08%  seqcount_spinlock_t
  +     0.08%  sigset_t
  +     0.08%  __poll_t

Let's use the typedef name directly and the resolved to get the size of
the type.

Committer testing:

  root@x1:~# diff -u before after | head -30
  --- before	2024-08-08 09:35:13.917325041 -0300
  +++ after	2024-08-08 09:37:35.312257905 -0300
  @@ -10,25 +10,27 @@
   # ........  .........
   #
       79.40%  (unknown)
  -     2.28%  union
        1.96%  (stack operation)
  -     1.24%  struct
  +     1.87%  pthread_mutex_t
        0.99%  u32[]
  -     0.92%  unsigned int
        0.77%  struct task_struct
  +     0.75%  U32
        0.75%  struct pcpu_hot
        0.63%  struct qspinlock
  +     0.61%  atomic_t
        0.59%  struct list_head
  -     0.58%  int
        0.53%  struct cfs_rq
        0.51%  BYTE*
  -     0.48%  unsigned char
  +     0.48%  BYTE
        0.48%  long unsigned int
        0.46%  struct rq
        0.41%  struct worker
        0.41%  struct memcg_vmstats_percpu
  +     0.41%  pthread_cond_t
        0.37%  _Bool
  +     0.36%  int
  root@x1:~#

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240807223129.1738004-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
index 24446412b869..336a3a183a78 100644
--- a/tools/perf/util/dwarf-aux.h
+++ b/tools/perf/util/dwarf-aux.h
@@ -56,6 +56,8 @@ const char *die_get_decl_file(Dwarf_Die *dw_die);
 /* Get type die */
 Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
 
+/* Get a type die, but skip qualifiers */
+Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
 /* Get a type die, but skip qualifiers and typedef */
 Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);