From: Andrii Nakryiko <andrii@xxxxxxxxxx>
Add bulk BTF type data copying API, btf__add_btf(), to libbpf. This API is
useful for tools that are manipulating BPF, such as pahole. They abstract away
the details of implementing a pretty mundane, but important to get right,
details of handling all possible BTF kinds, as well as, importantly, adjusting
BTF type IDs and copying/deduplicating strings and string offsets, referenced
from copied BTF types.
Also, being a batch API, it's possible to improve the efficiency by
preallocating necessary memory more efficiently.
This API is going to be used by pahole to implement efficient parallelized BTF
encoding.
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Andrii Nakryiko (3):
libbpf: add API that copies all BTF types from one BTF object to
another
selftests/bpf: refactor btf_write selftest to reuse BTF generation
logic
selftests/bpf: test new btf__add_btf() API
tools/lib/bpf/btf.c | 114 +++++++++++++-
tools/lib/bpf/btf.h | 22 +++
tools/lib/bpf/libbpf.map | 1 +
.../selftests/bpf/prog_tests/btf_write.c | 141 +++++++++++++++++-
4 files changed, 270 insertions(+), 8 deletions(-)
--
2.30.2
