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1 | /* | |
2 | * Copyright (c) 2015-2017 David Lamparter, for NetDEF, Inc. | |
3 | * | |
4 | * Permission to use, copy, modify, and distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
15 | */ | |
16 | ||
17 | #ifndef _FRR_COMPILER_H | |
18 | #define _FRR_COMPILER_H | |
19 | ||
20 | #ifdef __cplusplus | |
21 | extern "C" { | |
22 | #endif | |
23 | ||
24 | /* function attributes, use like | |
25 | * void prototype(void) __attribute__((_CONSTRUCTOR(100))); | |
26 | */ | |
27 | #if defined(__clang__) | |
28 | #if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 5) | |
29 | # define _RET_NONNULL , returns_nonnull | |
30 | #endif | |
31 | #if __has_attribute(fallthrough) | |
32 | # define _FALLTHROUGH __attribute__((fallthrough)); | |
33 | #endif | |
34 | # define _CONSTRUCTOR(x) constructor(x) | |
35 | # define _DEPRECATED(x) deprecated(x) | |
36 | #elif defined(__GNUC__) | |
37 | #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9) | |
38 | # define _RET_NONNULL , returns_nonnull | |
39 | #endif | |
40 | #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) | |
41 | # define _CONSTRUCTOR(x) constructor(x) | |
42 | # define _DESTRUCTOR(x) destructor(x) | |
43 | # define _ALLOC_SIZE(x) alloc_size(x) | |
44 | #endif | |
45 | #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) | |
46 | # define _DEPRECATED(x) deprecated(x) | |
47 | #endif | |
48 | #if __GNUC__ >= 7 | |
49 | # define _FALLTHROUGH __attribute__((fallthrough)); | |
50 | #endif | |
51 | #endif | |
52 | ||
53 | #ifdef __sun | |
54 | /* Solaris doesn't do constructor priorities due to linker restrictions */ | |
55 | #undef _CONSTRUCTOR | |
56 | #undef _DESTRUCTOR | |
57 | #endif | |
58 | ||
59 | /* fallback versions */ | |
60 | #ifndef _RET_NONNULL | |
61 | # define _RET_NONNULL | |
62 | #endif | |
63 | #ifndef _CONSTRUCTOR | |
64 | # define _CONSTRUCTOR(x) constructor | |
65 | #endif | |
66 | #ifndef _DESTRUCTOR | |
67 | # define _DESTRUCTOR(x) destructor | |
68 | #endif | |
69 | #ifndef _ALLOC_SIZE | |
70 | # define _ALLOC_SIZE(x) | |
71 | #endif | |
72 | #ifndef _FALLTHROUGH | |
73 | #define _FALLTHROUGH | |
74 | #endif | |
75 | #ifndef _DEPRECATED | |
76 | #define _DEPRECATED(x) deprecated | |
77 | #endif | |
78 | ||
79 | /* for helper functions defined inside macros */ | |
80 | #define macro_inline static inline __attribute__((unused)) | |
81 | #define macro_pure static inline __attribute__((unused, pure)) | |
82 | ||
83 | /* | |
84 | * for warnings on macros, put in the macro content like this: | |
85 | * #define MACRO BLA CPP_WARN("MACRO has been deprecated") | |
86 | */ | |
87 | #define CPP_STR(X) #X | |
88 | ||
89 | #if defined(__ICC) | |
90 | #define CPP_NOTICE(text) _Pragma(CPP_STR(message __FILE__ ": " text)) | |
91 | #define CPP_WARN(text) CPP_NOTICE(text) | |
92 | ||
93 | #elif (defined(__GNUC__) \ | |
94 | && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) \ | |
95 | || (defined(__clang__) \ | |
96 | && (__clang_major__ >= 4 \ | |
97 | || (__clang_major__ == 3 && __clang_minor__ >= 5))) | |
98 | #define CPP_WARN(text) _Pragma(CPP_STR(GCC warning text)) | |
99 | #define CPP_NOTICE(text) _Pragma(CPP_STR(message text)) | |
100 | ||
101 | #else | |
102 | #define CPP_WARN(text) | |
103 | #define CPP_NOTICE(text) | |
104 | #endif | |
105 | ||
106 | /* MAX / MIN are not commonly defined, but useful */ | |
107 | /* note: glibc sys/param.h has #define MIN(a,b) (((a)<(b))?(a):(b)) */ | |
108 | #ifdef MAX | |
109 | #undef MAX | |
110 | #endif | |
111 | #define MAX(a, b) \ | |
112 | ({ \ | |
113 | typeof(a) _max_a = (a); \ | |
114 | typeof(b) _max_b = (b); \ | |
115 | _max_a > _max_b ? _max_a : _max_b; \ | |
116 | }) | |
117 | #ifdef MIN | |
118 | #undef MIN | |
119 | #endif | |
120 | #define MIN(a, b) \ | |
121 | ({ \ | |
122 | typeof(a) _min_a = (a); \ | |
123 | typeof(b) _min_b = (b); \ | |
124 | _min_a < _min_b ? _min_a : _min_b; \ | |
125 | }) | |
126 | ||
127 | #ifndef offsetof | |
128 | #ifdef __compiler_offsetof | |
129 | #define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE,MEMBER) | |
130 | #else | |
131 | #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) | |
132 | #endif | |
133 | #endif | |
134 | ||
135 | /* this variant of container_of() retains 'const' on pointers without needing | |
136 | * to be told to do so. The following will all work without warning: | |
137 | * | |
138 | * struct member *p; | |
139 | * const struct member *cp; | |
140 | * | |
141 | * const struct cont *x = container_of(cp, struct cont, member); | |
142 | * const struct cont *x = container_of(cp, const struct cont, member); | |
143 | * const struct cont *x = container_of(p, struct cont, member); | |
144 | * const struct cont *x = container_of(p, const struct cont, member); | |
145 | * struct cont *x = container_of(p, struct cont, member); | |
146 | * | |
147 | * but the following will generate warnings about stripping const: | |
148 | * | |
149 | * struct cont *x = container_of(cp, struct cont, member); | |
150 | * struct cont *x = container_of(cp, const struct cont, member); | |
151 | * struct cont *x = container_of(p, const struct cont, member); | |
152 | */ | |
153 | #ifdef container_of | |
154 | #undef container_of | |
155 | #endif | |
156 | #define container_of(ptr, type, member) \ | |
157 | (__builtin_choose_expr( \ | |
158 | __builtin_types_compatible_p(typeof(&((type *)0)->member), \ | |
159 | typeof(ptr)) \ | |
160 | || __builtin_types_compatible_p(void *, typeof(ptr)), \ | |
161 | ({ \ | |
162 | typeof(((type *)0)->member) *__mptr = (void *)(ptr); \ | |
163 | (type *)((char *)__mptr - offsetof(type, member)); \ | |
164 | }), \ | |
165 | ({ \ | |
166 | typeof(((const type *)0)->member) *__mptr = (ptr); \ | |
167 | (const type *)((const char *)__mptr - \ | |
168 | offsetof(type, member)); \ | |
169 | }) \ | |
170 | )) | |
171 | ||
172 | #define container_of_null(ptr, type, member) \ | |
173 | ({ \ | |
174 | typeof(ptr) _tmp = (ptr); \ | |
175 | _tmp ? container_of(_tmp, type, member) : NULL; \ | |
176 | }) | |
177 | ||
178 | #define array_size(ar) (sizeof(ar) / sizeof(ar[0])) | |
179 | ||
180 | #ifdef __cplusplus | |
181 | } | |
182 | #endif | |
183 | ||
184 | #endif /* _FRR_COMPILER_H */ |