libbpf: add helpers for working with BTF types
Add lots of frequently used helpers that simplify working with BTF types. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -5,6 +5,7 @@
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#define __LIBBPF_BTF_H
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#include <stdarg.h>
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#include <linux/btf.h>
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#include <linux/types.h>
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#ifdef __cplusplus
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@ -120,6 +121,183 @@ LIBBPF_API void btf_dump__free(struct btf_dump *d);
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LIBBPF_API int btf_dump__dump_type(struct btf_dump *d, __u32 id);
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/*
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* A set of helpers for easier BTF types handling
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*/
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static inline __u16 btf_kind(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info);
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}
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static inline __u16 btf_vlen(const struct btf_type *t)
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{
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return BTF_INFO_VLEN(t->info);
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}
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static inline bool btf_kflag(const struct btf_type *t)
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{
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return BTF_INFO_KFLAG(t->info);
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}
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static inline bool btf_is_int(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_INT;
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}
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static inline bool btf_is_ptr(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_PTR;
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}
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static inline bool btf_is_array(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_ARRAY;
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}
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static inline bool btf_is_struct(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_STRUCT;
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}
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static inline bool btf_is_union(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_UNION;
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}
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static inline bool btf_is_composite(const struct btf_type *t)
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{
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__u16 kind = btf_kind(t);
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return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION;
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}
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static inline bool btf_is_enum(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_ENUM;
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}
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static inline bool btf_is_fwd(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_FWD;
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}
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static inline bool btf_is_typedef(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_TYPEDEF;
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}
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static inline bool btf_is_volatile(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_VOLATILE;
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}
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static inline bool btf_is_const(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_CONST;
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}
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static inline bool btf_is_restrict(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_RESTRICT;
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}
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static inline bool btf_is_mod(const struct btf_type *t)
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{
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__u16 kind = btf_kind(t);
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return kind == BTF_KIND_VOLATILE ||
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kind == BTF_KIND_CONST ||
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kind == BTF_KIND_RESTRICT;
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}
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static inline bool btf_is_func(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_FUNC;
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}
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static inline bool btf_is_func_proto(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_FUNC_PROTO;
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}
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static inline bool btf_is_var(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_VAR;
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}
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static inline bool btf_is_datasec(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_DATASEC;
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}
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static inline __u8 btf_int_encoding(const struct btf_type *t)
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{
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return BTF_INT_ENCODING(*(__u32 *)(t + 1));
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}
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static inline __u8 btf_int_offset(const struct btf_type *t)
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{
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return BTF_INT_OFFSET(*(__u32 *)(t + 1));
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}
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static inline __u8 btf_int_bits(const struct btf_type *t)
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{
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return BTF_INT_BITS(*(__u32 *)(t + 1));
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}
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static inline struct btf_array *btf_array(const struct btf_type *t)
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{
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return (struct btf_array *)(t + 1);
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}
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static inline struct btf_enum *btf_enum(const struct btf_type *t)
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{
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return (struct btf_enum *)(t + 1);
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}
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static inline struct btf_member *btf_members(const struct btf_type *t)
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{
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return (struct btf_member *)(t + 1);
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}
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/* Get bit offset of a member with specified index. */
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static inline __u32 btf_member_bit_offset(const struct btf_type *t,
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__u32 member_idx)
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{
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const struct btf_member *m = btf_members(t) + member_idx;
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bool kflag = btf_kflag(t);
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return kflag ? BTF_MEMBER_BIT_OFFSET(m->offset) : m->offset;
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}
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/*
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* Get bitfield size of a member, assuming t is BTF_KIND_STRUCT or
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* BTF_KIND_UNION. If member is not a bitfield, zero is returned.
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*/
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static inline __u32 btf_member_bitfield_size(const struct btf_type *t,
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__u32 member_idx)
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{
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const struct btf_member *m = btf_members(t) + member_idx;
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bool kflag = btf_kflag(t);
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return kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0;
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}
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static inline struct btf_param *btf_params(const struct btf_type *t)
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{
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return (struct btf_param *)(t + 1);
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}
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static inline struct btf_var *btf_var(const struct btf_type *t)
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{
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return (struct btf_var *)(t + 1);
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}
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static inline struct btf_var_secinfo *
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btf_var_secinfos(const struct btf_type *t)
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{
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return (struct btf_var_secinfo *)(t + 1);
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}
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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