projects / libside.git / blame
| Commit | Line | Data |
|---|---|---|
| f611d0c3 MD |
1 | // SPDX-License-Identifier: MIT |
| 2 | /* | |
| 3 | * Copyright 2022 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 4 | */ | |
| 5 | ||
| 6 | #ifndef _SIDE_MACROS_H | |
| 7 | #define _SIDE_MACROS_H | |
| 8 | ||
| 9 | /* Helper macros */ | |
| 10 | ||
| 11 | #define SIDE_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) | |
| 12 | ||
| 13 | /* | |
| 14 | * Compound literals with static storage are needed by SIDE | |
| 15 | * instrumentation. | |
| 16 | * Compound literals are part of the C99 and C11 standards, but not | |
| 17 | * part of the C++ standards. They are supported by most C++ compilers | |
| 18 | * though. | |
| 19 | * | |
| 20 | * Example use: | |
| 21 | * static struct mystruct *var = LTTNG_UST_COMPOUND_LITERAL(struct mystruct, { 1, 2, 3 }); | |
| 22 | */ | |
| 23 | #define SIDE_COMPOUND_LITERAL(type, ...) (type[]) { __VA_ARGS__ } | |
| 24 | ||
| 25 | #define side_likely(x) __builtin_expect(!!(x), 1) | |
| 26 | #define side_unlikely(x) __builtin_expect(!!(x), 0) | |
| 27 | ||
| 28 | #define SIDE_PARAM(...) __VA_ARGS__ | |
| 29 | ||
| b59abc69 MD |
30 | /* |
| 31 | * side_container_of - Get the address of an object containing a field. | |
| 32 | * | |
| 33 | * @ptr: pointer to the field. | |
| 34 | * @type: type of the object. | |
| 35 | * @member: name of the field within the object. | |
| 36 | */ | |
| 37 | #define side_container_of(ptr, type, member) \ | |
| 38 | __extension__ \ | |
| 39 | ({ \ | |
| 40 | const __typeof__(((type *) NULL)->member) * __ptr = (ptr); \ | |
| 41 | (type *)((char *)__ptr - offsetof(type, member)); \ | |
| 42 | }) | |
| 43 | ||
| f611d0c3 | 44 | #endif /* _SIDE_MACROS_H */ |