linux-kernel - [PATCH v1 03/11] perf dwarf-aux: Preserve typedefs in match_var

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Message-ID: <20260127020617.2804780-4-zli94@ncsu.edu>
Date: Mon, 26 Jan 2026 21:04:56 -0500
From: Zecheng Li <zli94@...u.edu>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	James Clark <james.clark@...aro.org>,
	Zecheng Li <zli94@...u.edu>,
	xliuprof@...gle.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Zecheng Li <zecheng@...gle.com>
Subject: [PATCH v1 03/11] perf dwarf-aux: Preserve typedefs in match_var_offset

From: Zecheng Li <zecheng@...gle.com>

Since we are skipping the check_variable, we need to preserve typedefs
in match_var_offset to match the results by __die_get_real_type. Also
move the (offset == 0) branch after the is_pointer check to ensure the
correct type is used, fixing cases where an incorrect pointer type was
chosen when the access offset was 0.

Signed-off-by: Zecheng Li <zecheng@...gle.com>
Signed-off-by: Zecheng Li <zli94@...u.edu>
---
 tools/perf/util/dwarf-aux.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index 96cfcbd40c45..ce816aefa95b 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -1420,26 +1420,29 @@ static bool match_var_offset(Dwarf_Die *die_mem, struct find_var_data *data,
 			     s64 addr_offset, s64 addr_type, bool is_pointer)
 {
 	Dwarf_Word size;
+	Dwarf_Die ptr_die;
+	Dwarf_Die *ptr_type;
 	s64 offset = addr_offset - addr_type;
 
-	if (offset == 0) {
-		/* Update offset relative to the start of the variable */
-		data->offset = 0;
-		return true;
-	}
-
 	if (offset < 0)
 		return false;
 
-	if (die_get_real_type(die_mem, &data->type) == NULL)
+	if (__die_get_real_type(die_mem, &data->type) == NULL)
 		return false;
 
-	if (is_pointer && dwarf_tag(&data->type) == DW_TAG_pointer_type) {
+	ptr_type = die_get_pointer_type(&data->type, &ptr_die);
+	if (is_pointer && ptr_type) {
 		/* Get the target type of the pointer */
-		if (die_get_real_type(&data->type, &data->type) == NULL)
+		if (__die_get_real_type(ptr_type, &data->type) == NULL)
 			return false;
 	}
 
+	if (offset == 0) {
+		/* Update offset relative to the start of the variable */
+		data->offset = 0;
+		return true;
+	}
+
 	if (dwarf_aggregate_size(&data->type, &size) < 0)
 		return false;
 
-- 
2.52.0