From: Zecheng Li <zecheng@google.com>

When comparing types from different scopes, first compare their type
offsets. A larger offset means the field belongs to an outer
(enclosing) struct. This helps resolve cases where a pointer is found
in an inner scope, but a struct containing that pointer exists in an
outer scope. Previously, is_better_type would prefer the pointer type,
but the struct type is actually more complete and should be chosen.

Prefer types from outer scopes when is_better_type cannot determine
a better type. This is a heuristic for the case `struct A { struct B; }`
where A and B have the same size but I think in most cases A is in the
outer scope and should be preferred.

Signed-off-by: Zecheng Li <zecheng@google.com>
Signed-off-by: Zecheng Li <zli94@ncsu.edu>
---
 tools/perf/util/annotate-data.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/annotate-data.c b/tools/perf/util/annotate-data.c
index 8ff1972981b7..8ea3e8b024e8 100644
--- a/tools/perf/util/annotate-data.c
+++ b/tools/perf/util/annotate-data.c
@@ -1634,7 +1634,9 @@ static int find_data_type_die(struct data_loc_info *dloc, Dwarf_Die *type_die)
 				pr_debug_dtp("type_offset=%#x\n", type_offset);
 			}
 
-			if (!found || is_better_type(type_die, &mem_die)) {
+			if (!found || dloc->type_offset < type_offset ||
+			    (dloc->type_offset == type_offset &&
+			     !is_better_type(&mem_die, type_die))) {
 				*type_die = mem_die;
 				dloc->type_offset = type_offset;
 				found = true;
-- 
2.52.0