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| author | Andrii Nakryiko <andriin@fb.com> | 2019-02-05 02:29:45 +0100 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-02-05 16:52:57 +0100 |
| commit | d5caef5b56555bfa2ac0cf730f075864a023437e (patch) | |
| tree | aa8f77aa92737d225574fe536014e9d49ff28b29 /tools/lib/bpf/btf.h | |
| parent | btf: extract BTF type size calculation (diff) | |
| download | linux-d5caef5b56555bfa2ac0cf730f075864a023437e.tar.xz linux-d5caef5b56555bfa2ac0cf730f075864a023437e.zip | |
btf: add BTF types deduplication algorithm
This patch implements BTF types deduplication algorithm. It allows to
greatly compress typical output of pahole's DWARF-to-BTF conversion or
LLVM's compilation output by detecting and collapsing identical types emitted in
isolation per compilation unit. Algorithm also resolves struct/union forward
declarations into concrete BTF types representing referenced struct/union. If
undesired, this resolution can be disabled through specifying corresponding options.
Algorithm itself and its application to Linux kernel's BTF types is
described in details at:
https://facebookmicrosites.github.io/bpf/blog/2018/11/14/btf-enhancement.html
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/lib/bpf/btf.h')
| -rw-r--r-- | tools/lib/bpf/btf.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h index 258c87e9f55d..c739de7ed993 100644 --- a/tools/lib/bpf/btf.h +++ b/tools/lib/bpf/btf.h @@ -84,6 +84,13 @@ LIBBPF_API int btf_ext__reloc_line_info(const struct btf *btf, LIBBPF_API __u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext); LIBBPF_API __u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext); +struct btf_dedup_opts { + bool dont_resolve_fwds; +}; + +LIBBPF_API int btf__dedup(struct btf *btf, struct btf_ext *btf_ext, + const struct btf_dedup_opts *opts); + #ifdef __cplusplus } /* extern "C" */ #endif |