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553 lines
18 KiB
553 lines
18 KiB
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
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/* Copyright (c) 2018 Facebook */ |
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/*! \file */ |
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#ifndef __LIBBPF_BTF_H |
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#define __LIBBPF_BTF_H |
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#include <stdarg.h> |
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#include <stdbool.h> |
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#include <linux/btf.h> |
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#include <linux/types.h> |
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#include "libbpf_common.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#define BTF_ELF_SEC ".BTF" |
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#define BTF_EXT_ELF_SEC ".BTF.ext" |
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#define MAPS_ELF_SEC ".maps" |
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struct btf; |
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struct btf_ext; |
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struct btf_type; |
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struct bpf_object; |
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enum btf_endianness { |
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BTF_LITTLE_ENDIAN = 0, |
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BTF_BIG_ENDIAN = 1, |
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}; |
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/** |
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* @brief **btf__free()** frees all data of a BTF object |
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* @param btf BTF object to free |
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*/ |
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LIBBPF_API void btf__free(struct btf *btf); |
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/** |
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* @brief **btf__new()** creates a new instance of a BTF object from the raw |
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* bytes of an ELF's BTF section |
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* @param data raw bytes |
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* @param size number of bytes passed in `data` |
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* @return new BTF object instance which has to be eventually freed with |
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* **btf__free()** |
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* |
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* On error, error-code-encoded-as-pointer is returned, not a NULL. To extract |
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* error code from such a pointer `libbpf_get_error()` should be used. If |
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* `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is |
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* returned on error instead. In both cases thread-local `errno` variable is |
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* always set to error code as well. |
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*/ |
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LIBBPF_API struct btf *btf__new(const void *data, __u32 size); |
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/** |
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* @brief **btf__new_split()** create a new instance of a BTF object from the |
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* provided raw data bytes. It takes another BTF instance, **base_btf**, which |
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* serves as a base BTF, which is extended by types in a newly created BTF |
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* instance |
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* @param data raw bytes |
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* @param size length of raw bytes |
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* @param base_btf the base BTF object |
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* @return new BTF object instance which has to be eventually freed with |
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* **btf__free()** |
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* |
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* If *base_btf* is NULL, `btf__new_split()` is equivalent to `btf__new()` and |
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* creates non-split BTF. |
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* |
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* On error, error-code-encoded-as-pointer is returned, not a NULL. To extract |
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* error code from such a pointer `libbpf_get_error()` should be used. If |
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* `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is |
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* returned on error instead. In both cases thread-local `errno` variable is |
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* always set to error code as well. |
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*/ |
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LIBBPF_API struct btf *btf__new_split(const void *data, __u32 size, struct btf *base_btf); |
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/** |
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* @brief **btf__new_empty()** creates an empty BTF object. Use |
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* `btf__add_*()` to populate such BTF object. |
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* @return new BTF object instance which has to be eventually freed with |
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* **btf__free()** |
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* |
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* On error, error-code-encoded-as-pointer is returned, not a NULL. To extract |
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* error code from such a pointer `libbpf_get_error()` should be used. If |
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* `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is |
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* returned on error instead. In both cases thread-local `errno` variable is |
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* always set to error code as well. |
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*/ |
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LIBBPF_API struct btf *btf__new_empty(void); |
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/** |
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* @brief **btf__new_empty_split()** creates an unpopulated BTF object from an |
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* ELF BTF section except with a base BTF on top of which split BTF should be |
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* based |
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* @return new BTF object instance which has to be eventually freed with |
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* **btf__free()** |
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* |
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* If *base_btf* is NULL, `btf__new_empty_split()` is equivalent to |
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* `btf__new_empty()` and creates non-split BTF. |
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* |
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* On error, error-code-encoded-as-pointer is returned, not a NULL. To extract |
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* error code from such a pointer `libbpf_get_error()` should be used. If |
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* `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is |
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* returned on error instead. In both cases thread-local `errno` variable is |
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* always set to error code as well. |
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*/ |
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LIBBPF_API struct btf *btf__new_empty_split(struct btf *base_btf); |
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LIBBPF_API struct btf *btf__parse(const char *path, struct btf_ext **btf_ext); |
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LIBBPF_API struct btf *btf__parse_split(const char *path, struct btf *base_btf); |
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LIBBPF_API struct btf *btf__parse_elf(const char *path, struct btf_ext **btf_ext); |
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LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_btf); |
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LIBBPF_API struct btf *btf__parse_raw(const char *path); |
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LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf); |
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LIBBPF_API struct btf *btf__load_vmlinux_btf(void); |
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LIBBPF_API struct btf *btf__load_module_btf(const char *module_name, struct btf *vmlinux_btf); |
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LIBBPF_API struct btf *libbpf_find_kernel_btf(void); |
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LIBBPF_API struct btf *btf__load_from_kernel_by_id(__u32 id); |
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LIBBPF_API struct btf *btf__load_from_kernel_by_id_split(__u32 id, struct btf *base_btf); |
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LIBBPF_API int btf__load_into_kernel(struct btf *btf); |
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LIBBPF_API __s32 btf__find_by_name(const struct btf *btf, |
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const char *type_name); |
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LIBBPF_API __s32 btf__find_by_name_kind(const struct btf *btf, |
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const char *type_name, __u32 kind); |
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LIBBPF_API __u32 btf__type_cnt(const struct btf *btf); |
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LIBBPF_API const struct btf *btf__base_btf(const struct btf *btf); |
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LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf, |
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__u32 id); |
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LIBBPF_API size_t btf__pointer_size(const struct btf *btf); |
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LIBBPF_API int btf__set_pointer_size(struct btf *btf, size_t ptr_sz); |
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LIBBPF_API enum btf_endianness btf__endianness(const struct btf *btf); |
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LIBBPF_API int btf__set_endianness(struct btf *btf, enum btf_endianness endian); |
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LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id); |
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LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id); |
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LIBBPF_API int btf__align_of(const struct btf *btf, __u32 id); |
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LIBBPF_API int btf__fd(const struct btf *btf); |
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LIBBPF_API void btf__set_fd(struct btf *btf, int fd); |
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LIBBPF_API const void *btf__raw_data(const struct btf *btf, __u32 *size); |
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LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset); |
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LIBBPF_API const char *btf__str_by_offset(const struct btf *btf, __u32 offset); |
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LIBBPF_API struct btf_ext *btf_ext__new(const __u8 *data, __u32 size); |
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LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext); |
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LIBBPF_API const void *btf_ext__raw_data(const struct btf_ext *btf_ext, __u32 *size); |
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LIBBPF_API int btf__find_str(struct btf *btf, const char *s); |
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LIBBPF_API int btf__add_str(struct btf *btf, const char *s); |
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LIBBPF_API int btf__add_type(struct btf *btf, const struct btf *src_btf, |
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const struct btf_type *src_type); |
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/** |
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* @brief **btf__add_btf()** appends all the BTF types from *src_btf* into *btf* |
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* @param btf BTF object which all the BTF types and strings are added to |
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* @param src_btf BTF object which all BTF types and referenced strings are copied from |
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* @return BTF type ID of the first appended BTF type, or negative error code |
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* |
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* **btf__add_btf()** can be used to simply and efficiently append the entire |
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* contents of one BTF object to another one. All the BTF type data is copied |
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* over, all referenced type IDs are adjusted by adding a necessary ID offset. |
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* Only strings referenced from BTF types are copied over and deduplicated, so |
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* if there were some unused strings in *src_btf*, those won't be copied over, |
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* which is consistent with the general string deduplication semantics of BTF |
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* writing APIs. |
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* |
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* If any error is encountered during this process, the contents of *btf* is |
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* left intact, which means that **btf__add_btf()** follows the transactional |
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* semantics and the operation as a whole is all-or-nothing. |
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* |
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* *src_btf* has to be non-split BTF, as of now copying types from split BTF |
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* is not supported and will result in -ENOTSUP error code returned. |
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*/ |
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LIBBPF_API int btf__add_btf(struct btf *btf, const struct btf *src_btf); |
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LIBBPF_API int btf__add_int(struct btf *btf, const char *name, size_t byte_sz, int encoding); |
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LIBBPF_API int btf__add_float(struct btf *btf, const char *name, size_t byte_sz); |
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LIBBPF_API int btf__add_ptr(struct btf *btf, int ref_type_id); |
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LIBBPF_API int btf__add_array(struct btf *btf, |
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int index_type_id, int elem_type_id, __u32 nr_elems); |
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/* struct/union construction APIs */ |
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LIBBPF_API int btf__add_struct(struct btf *btf, const char *name, __u32 sz); |
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LIBBPF_API int btf__add_union(struct btf *btf, const char *name, __u32 sz); |
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LIBBPF_API int btf__add_field(struct btf *btf, const char *name, int field_type_id, |
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__u32 bit_offset, __u32 bit_size); |
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/* enum construction APIs */ |
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LIBBPF_API int btf__add_enum(struct btf *btf, const char *name, __u32 bytes_sz); |
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LIBBPF_API int btf__add_enum_value(struct btf *btf, const char *name, __s64 value); |
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LIBBPF_API int btf__add_enum64(struct btf *btf, const char *name, __u32 bytes_sz, bool is_signed); |
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LIBBPF_API int btf__add_enum64_value(struct btf *btf, const char *name, __u64 value); |
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enum btf_fwd_kind { |
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BTF_FWD_STRUCT = 0, |
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BTF_FWD_UNION = 1, |
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BTF_FWD_ENUM = 2, |
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}; |
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LIBBPF_API int btf__add_fwd(struct btf *btf, const char *name, enum btf_fwd_kind fwd_kind); |
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LIBBPF_API int btf__add_typedef(struct btf *btf, const char *name, int ref_type_id); |
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LIBBPF_API int btf__add_volatile(struct btf *btf, int ref_type_id); |
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LIBBPF_API int btf__add_const(struct btf *btf, int ref_type_id); |
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LIBBPF_API int btf__add_restrict(struct btf *btf, int ref_type_id); |
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LIBBPF_API int btf__add_type_tag(struct btf *btf, const char *value, int ref_type_id); |
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/* func and func_proto construction APIs */ |
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LIBBPF_API int btf__add_func(struct btf *btf, const char *name, |
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enum btf_func_linkage linkage, int proto_type_id); |
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LIBBPF_API int btf__add_func_proto(struct btf *btf, int ret_type_id); |
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LIBBPF_API int btf__add_func_param(struct btf *btf, const char *name, int type_id); |
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/* var & datasec construction APIs */ |
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LIBBPF_API int btf__add_var(struct btf *btf, const char *name, int linkage, int type_id); |
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LIBBPF_API int btf__add_datasec(struct btf *btf, const char *name, __u32 byte_sz); |
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LIBBPF_API int btf__add_datasec_var_info(struct btf *btf, int var_type_id, |
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__u32 offset, __u32 byte_sz); |
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/* tag construction API */ |
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LIBBPF_API int btf__add_decl_tag(struct btf *btf, const char *value, int ref_type_id, |
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int component_idx); |
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struct btf_dedup_opts { |
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size_t sz; |
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/* optional .BTF.ext info to dedup along the main BTF info */ |
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struct btf_ext *btf_ext; |
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/* force hash collisions (used for testing) */ |
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bool force_collisions; |
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size_t :0; |
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}; |
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#define btf_dedup_opts__last_field force_collisions |
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LIBBPF_API int btf__dedup(struct btf *btf, const struct btf_dedup_opts *opts); |
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struct btf_dump; |
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struct btf_dump_opts { |
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size_t sz; |
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}; |
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#define btf_dump_opts__last_field sz |
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typedef void (*btf_dump_printf_fn_t)(void *ctx, const char *fmt, va_list args); |
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LIBBPF_API struct btf_dump *btf_dump__new(const struct btf *btf, |
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btf_dump_printf_fn_t printf_fn, |
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void *ctx, |
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const struct btf_dump_opts *opts); |
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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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struct btf_dump_emit_type_decl_opts { |
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/* size of this struct, for forward/backward compatiblity */ |
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size_t sz; |
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/* optional field name for type declaration, e.g.: |
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* - struct my_struct <FNAME> |
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* - void (*<FNAME>)(int) |
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* - char (*<FNAME>)[123] |
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*/ |
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const char *field_name; |
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/* extra indentation level (in number of tabs) to emit for multi-line |
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* type declarations (e.g., anonymous struct); applies for lines |
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* starting from the second one (first line is assumed to have |
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* necessary indentation already |
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*/ |
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int indent_level; |
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/* strip all the const/volatile/restrict mods */ |
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bool strip_mods; |
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size_t :0; |
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}; |
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#define btf_dump_emit_type_decl_opts__last_field strip_mods |
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LIBBPF_API int |
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btf_dump__emit_type_decl(struct btf_dump *d, __u32 id, |
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const struct btf_dump_emit_type_decl_opts *opts); |
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struct btf_dump_type_data_opts { |
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/* size of this struct, for forward/backward compatibility */ |
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size_t sz; |
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const char *indent_str; |
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int indent_level; |
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/* below match "show" flags for bpf_show_snprintf() */ |
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bool compact; /* no newlines/indentation */ |
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bool skip_names; /* skip member/type names */ |
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bool emit_zeroes; /* show 0-valued fields */ |
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size_t :0; |
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}; |
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#define btf_dump_type_data_opts__last_field emit_zeroes |
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LIBBPF_API int |
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btf_dump__dump_type_data(struct btf_dump *d, __u32 id, |
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const void *data, size_t data_sz, |
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const struct btf_dump_type_data_opts *opts); |
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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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* The inline functions below rely on constants from the kernel headers which |
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* may not be available for applications including this header file. To avoid |
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* compilation errors, we define all the constants here that were added after |
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* the initial introduction of the BTF_KIND* constants. |
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*/ |
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#ifndef BTF_KIND_FUNC |
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#define BTF_KIND_FUNC 12 /* Function */ |
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#define BTF_KIND_FUNC_PROTO 13 /* Function Proto */ |
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#endif |
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#ifndef BTF_KIND_VAR |
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#define BTF_KIND_VAR 14 /* Variable */ |
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#define BTF_KIND_DATASEC 15 /* Section */ |
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#endif |
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#ifndef BTF_KIND_FLOAT |
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#define BTF_KIND_FLOAT 16 /* Floating point */ |
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#endif |
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/* The kernel header switched to enums, so the following were never #defined */ |
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#define BTF_KIND_DECL_TAG 17 /* Decl Tag */ |
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#define BTF_KIND_TYPE_TAG 18 /* Type Tag */ |
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#define BTF_KIND_ENUM64 19 /* Enum for up-to 64bit values */ |
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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_void(const struct btf_type *t) |
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{ |
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return btf_kind(t) == BTF_KIND_UNKN; |
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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_enum64(const struct btf_type *t) |
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{ |
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return btf_kind(t) == BTF_KIND_ENUM64; |
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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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kind == BTF_KIND_TYPE_TAG; |
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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 bool btf_is_float(const struct btf_type *t) |
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{ |
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return btf_kind(t) == BTF_KIND_FLOAT; |
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} |
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static inline bool btf_is_decl_tag(const struct btf_type *t) |
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{ |
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return btf_kind(t) == BTF_KIND_DECL_TAG; |
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} |
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static inline bool btf_is_type_tag(const struct btf_type *t) |
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{ |
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return btf_kind(t) == BTF_KIND_TYPE_TAG; |
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} |
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static inline bool btf_is_any_enum(const struct btf_type *t) |
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{ |
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return btf_is_enum(t) || btf_is_enum64(t); |
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} |
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static inline bool btf_kind_core_compat(const struct btf_type *t1, |
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const struct btf_type *t2) |
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{ |
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return btf_kind(t1) == btf_kind(t2) || |
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(btf_is_any_enum(t1) && btf_is_any_enum(t2)); |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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static inline struct btf_enum64 *btf_enum64(const struct btf_type *t) |
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{ |
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return (struct btf_enum64 *)(t + 1); |
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} |
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|
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static inline __u64 btf_enum64_value(const struct btf_enum64 *e) |
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{ |
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return ((__u64)e->val_hi32 << 32) | e->val_lo32; |
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} |
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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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|
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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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|
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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); |
|
|
|
return kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0; |
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} |
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|
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static inline struct btf_param *btf_params(const struct btf_type *t) |
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{ |
|
return (struct btf_param *)(t + 1); |
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} |
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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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|
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static inline struct btf_var_secinfo * |
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btf_var_secinfos(const struct btf_type *t) |
|
{ |
|
return (struct btf_var_secinfo *)(t + 1); |
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} |
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|
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struct btf_decl_tag; |
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static inline struct btf_decl_tag *btf_decl_tag(const struct btf_type *t) |
|
{ |
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return (struct btf_decl_tag *)(t + 1); |
|
} |
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|
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#ifdef __cplusplus |
|
} /* extern "C" */ |
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#endif |
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|
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#endif /* __LIBBPF_BTF_H */
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