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libbpf: Extract internal set-of-strings datastructure APIs

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Extract BTF logic for maintaining a set of strings data structure, used for
BTF strings section construction in writable mode, into separate re-usable
API. This data structure is going to be used by bpf_linker to maintains ELF
STRTAB section, which has the same layout as BTF strings section.

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210318194036.3521577-5-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-03-18 12:40:28 -07:00 • committed by Alexei Starovoitov
parent 3b029e06f6
commit 90d76d3ece
4 changed files with 259 additions and 195 deletions
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21
tools/lib/bpf/strset.h Normal file
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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
/* Copyright (c) 2021 Facebook */
#ifndef __LIBBPF_STRSET_H
#define __LIBBPF_STRSET_H
#include <stdbool.h>
#include <stddef.h>
struct strset;
struct strset *strset__new(size_t max_data_sz, const char *init_data, size_t init_data_sz);
void strset__free(struct strset *set);
const char *strset__data(const struct strset *set);
size_t strset__data_size(const struct strset *set);
int strset__find_str(struct strset *set, const char *s);
int strset__add_str(struct strset *set, const char *s);
#endif /* __LIBBPF_STRSET_H */