This patch set switches pahole to use libbpf-provided BTF loading and encoding
APIs. This reduces pahole's own BTF encoding code, speeds up the process,
reduces amount of RAM needed for DWARF-to-BTF conversion. Also, pahole finally
gets support to generating BTF for cross-compiled ELF binaries with different
endianness (patch #11).
Additionally, patch #6 fixes previously missed problem with invalid array
index type generation.
Patches #7-10 are speeding up DWARF-to-BTF convertion/dedup pretty
significantly, saving overall about 9 seconds out of current 27 or so.
Patch #8 revamps how per-CPU BTF variables are emitted, eliminating repeated
and expensive looping over ELF symbols table.
Patch #10 admittedly has some hacky parts to satisfy CTF use case, but its
speed ups are greatest. So I'll understand if it gets dropped, but it would be
a pity.
More details could be found in respective patches.
Andrii Nakryiko (11):
libbpf: update to latest libbpf version
btf_encoder: detect BTF encoding errors and exit
dwarves: expose and maintain active debug info loader operations
btf_loader: use libbpf to load BTF
btf_encoder: use libbpf APIs to encode BTF type info
btf_encoder: fix emitting __ARRAY_SIZE_TYPE__ as index range type
btf_encoder: discard CUs after BTF encoding
btf_encoder: revamp how per-CPU variables are encoded
dwarf_loader: increase the size of lookup hash map
strings: use BTF's string APIs for strings management
btf_encoder: support cross-compiled ELF binaries with different
endianness
btf_encoder.c | 361 +++++++++++++++------------
btf_loader.c | 244 +++++++-----------
ctf_encoder.c | 2 +-
dwarf_loader.c | 2 +-
dwarves.c | 8 +
lib/bpf | 2 +-
libbtf.c | 661 +++++++++++++++++++++----------------------------
libbtf.h | 41 ++-
libctf.c | 14 +-
libctf.h | 4 +-
pahole.c | 9 +-
strings.c | 91 +++----
strings.h | 32 +--
13 files changed, 653 insertions(+), 818 deletions(-)
--
2.24.1
