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perf dwarf-aux: Handle array types in die_get_member_type

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When a struct member is an array type, die_get_member_type() would stop
iterating since array types weren't handled in the loop. This caused
accesses to array elements within structs to not resolve properly.

Add array type handling by resolving the array to its element type and
calculating the offset within an element using modulo arithmetic

This improves type annotation coverage for struct members that are
arrays.

Signed-off-by: Zecheng Li <zli94@ncsu.edu>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Zecheng Li 2026-03-09 13:55:18 -04:00 committed by Namhyung Kim
parent 69953f9c65
commit 6ffc3d0d3d
1 changed files with 16 additions and 1 deletions
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17
tools/perf/util/dwarf-aux.c
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@ -2127,13 +2127,28 @@ Dwarf_Die *die_get_member_type(Dwarf_Die *type_die, int offset,
tag = dwarf_tag(&mb_type);
if (tag == DW_TAG_structure_type || tag == DW_TAG_union_type) {
if (tag == DW_TAG_structure_type || tag == DW_TAG_union_type ||
tag == DW_TAG_array_type) {
Dwarf_Word loc;
/* Update offset for the start of the member struct */
if (die_get_data_member_location(member, &loc) == 0)
offset -= loc;
}
/* Handle array types: resolve to the element type by one level */
if (tag == DW_TAG_array_type) {
Dwarf_Word size;
if (die_get_real_type(&mb_type, &mb_type) == NULL)
return NULL;
if (dwarf_aggregate_size(&mb_type, &size) < 0)
return NULL;
offset = offset % size;
tag = dwarf_tag(&mb_type);
}
}
*die_mem = mb_type;
return die_mem;