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libbpf: add btf_dump API for BTF-to-C conversion

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BTF contains enough type information to allow generating valid
compilable C header w/ correct layout of structs/unions and all the
typedef/enum definitions. This patch adds a new "object" - btf_dump to
facilitate dumping BTF as valid C. btf_dump__dump_type() is the main API
which takes care of dumping out (through user-provided printf-like
callback function) C definitions for given type ID and it's required
dependencies. This allows for not just dumping out entirety of BTF types,
but also selective filtering based on user-provided criterias w/ minimal
set of dependent types.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2019-05-24 11:59:03 -07:00
committed by Alexei Starovoitov
parent 2fc3fc0bcd
commit 351131b51c
4 changed files with 1359 additions and 1 deletions
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3
tools/lib/bpf/libbpf.map
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@@ -167,5 +167,8 @@ LIBBPF_0.0.3 {
LIBBPF_0.0.4 {
global:
btf_dump__dump_type;
btf_dump__free;
btf_dump__new;
btf__parse_elf;
} LIBBPF_0.0.3;