Xenomai  3.1
compiler.h
1 /*
2  * Copyright (C) 2013 Philippe Gerum <rpm@xenomai.org>.
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13 
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
17  */
18 #ifndef _BOILERPLATE_COMPILER_H
19 #define _BOILERPLATE_COMPILER_H
20 
21 #include <stddef.h>
22 
23 #define container_of(ptr, type, member) \
24  ({ \
25  const __typeof__(((type *)0)->member) *__mptr = (ptr); \
26  (type *)((char *)__mptr - offsetof(type, member)); \
27  })
28 
29 #define __stringify_1(x...) #x
30 #define __stringify(x...) __stringify_1(x)
31 
32 #ifndef __noreturn
33 #define __noreturn __attribute__((__noreturn__))
34 #endif
35 
36 #ifndef __must_check
37 #define __must_check __attribute__((__warn_unused_result__))
38 #endif
39 
40 #ifndef __weak
41 #define __weak __attribute__((__weak__))
42 #endif
43 
44 #ifndef __maybe_unused
45 #define __maybe_unused __attribute__((__unused__))
46 #endif
47 
48 #ifndef __aligned
49 #define __aligned(__n) __attribute__((aligned (__n)))
50 #endif
51 
52 #ifndef __deprecated
53 #define __deprecated __attribute__((__deprecated__))
54 #endif
55 
56 #ifndef __packed
57 #define __packed __attribute__((__packed__))
58 #endif
59 
60 #ifndef __alloc_size
61 #define __alloc_size(__args) __attribute__((__alloc_size__(__args)))
62 #endif
63 
64 #define __align_to(__size, __al) (((__size) + (__al) - 1) & (~((__al) - 1)))
65 
66 #ifdef __cplusplus
67 extern "C" {
68 #endif
69 
70 #define xenomai_count_trailing_zeros(x) \
71  ((x) == 0 ? (int)(sizeof(x) * __CHAR_BIT__) \
72  : sizeof(x) <= sizeof(unsigned int) ? \
73  __builtin_ctz((unsigned int)x) \
74  : sizeof(x) <= sizeof(unsigned long) ? \
75  __builtin_ctzl((unsigned long)x) \
76  : __builtin_ctzll(x))
77 
78 #define xenomai_count_leading_zeros(x) \
79  ((x) == 0 ? (int)(sizeof(x) * __CHAR_BIT__) \
80  : sizeof(x) <= sizeof(unsigned int) ? \
81  __builtin_clz((unsigned int)x) + \
82  (int)(sizeof(unsigned int) - sizeof(x)) \
83  : sizeof(x) <= sizeof(unsigned long) ? \
84  __builtin_clzl((unsigned long)x) \
85  : __builtin_clzll(x))
86 
87 #ifdef __cplusplus
88 }
89 #endif
90 
91 #endif /* _BOILERPLATE_COMPILER_H */