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6084f5dc92
Change btf_dump__new() and corresponding struct btf_dump_ops structure to be extensible by using OPTS "framework" ([0]). Given we don't change the names, we use a similar approach as with bpf_prog_load(), but this time we ended up with two APIs with the same name and same number of arguments, so overloading based on number of arguments with ___libbpf_override() doesn't work. Instead, use "overloading" based on types. In this particular case, print callback has to be specified, so we detect which argument is a callback. If it's 4th (last) argument, old implementation of API is used by user code. If not, it must be 2nd, and thus new implementation is selected. The rest is handled by the same symbol versioning approach. btf_ext argument is dropped as it was never used and isn't necessary either. If in the future we'll need btf_ext, that will be added into OPTS-based struct btf_dump_opts. struct btf_dump_opts is reused for both old API and new APIs. ctx field is marked deprecated in v0.7+ and it's put at the same memory location as OPTS's sz field. Any user of new-style btf_dump__new() will have to set sz field and doesn't/shouldn't use ctx, as ctx is now passed along the callback as mandatory input argument, following the other APIs in libbpf that accept callbacks consistently. Again, this is quite ugly in implementation, but is done in the name of backwards compatibility and uniform and extensible future APIs (at the same time, sigh). And it will be gone in libbpf 1.0. [0] Closes: https://github.com/libbpf/libbpf/issues/283 Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211111053624.190580-5-andrii@kernel.org |
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