Hello,

The flexible arrays are dynamically allocated with different size.  So checking
with the original type size won't match and cannot match the sample.  This patch
series detects those flex-arrays and allows accesses beyond the original size.

I'm not sure what's the best way to add test codes for data type profiling as it
seems we need to add a lot more workloads for different cases.  Probably we may
want to split the workloads as separate binaries.

v2 changes)
 * fix missing index increment in the histogram
 * support flex array in union types
 * add recursion check in die_has_flex_array()
 * check negative index arrays properly
 * avoid divide-by-zero when the size is unknown

v1: https://lore.kernel.org/r/20260912054706.1475583-1-namhyung@kernel.org

Thanks,
Namhyung


Cc: Zecheng Li <zli94@ncsu.edu>
Cc: Yanbo Zhao <yzhao62@ncsu.edu>
Cc: Tengda Wu <wutengda@huaweicloud.com>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>

Namhyung Kim (4):
  perf annotate-data: Convert type histogram to hashmap
  perf dwarf-aux: Add die_has_flex_array() helper
  perf annotate-date: Allow out-of-size access for flex-array types
  perf annotate-data: Adjust type offset for flex-array

 tools/perf/ui/browsers/annotate-data.c |  10 +-
 tools/perf/util/annotate-data.c        | 209 +++++++++++++++++--------
 tools/perf/util/annotate-data.h        |  10 +-
 tools/perf/util/dwarf-aux.c            |  77 +++++++++
 tools/perf/util/dwarf-aux.h            |   3 +
 5 files changed, 241 insertions(+), 68 deletions(-)

-- 
2.55.0.1032.g73a4cd73de-goog