perf dwarf-aux: Handle bitfield members from pointer access
The __die_find_member_offset_cb() missed to handle bitfield members
which don't have DW_AT_data_member_location. Like in adding member
types in __add_member_cb() it should fallback to check the bit offset
when it resolves the member type for an offset.
Fixes: 437683a994
("perf dwarf-aux: Handle type transfer for memory access")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240821232628.353177-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -1977,8 +1977,15 @@ static int __die_find_member_offset_cb(Dwarf_Die *die_mem, void *arg)
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return DIE_FIND_CB_SIBLING;
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/* Unions might not have location */
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if (die_get_data_member_location(die_mem, &loc) < 0)
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loc = 0;
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if (die_get_data_member_location(die_mem, &loc) < 0) {
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Dwarf_Attribute attr;
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if (dwarf_attr_integrate(die_mem, DW_AT_data_bit_offset, &attr) &&
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dwarf_formudata(&attr, &loc) == 0)
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loc /= 8;
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else
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loc = 0;
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}
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if (offset == loc)
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return DIE_FIND_CB_END;
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