1
2
3#ifndef COMPILER_H
4#define COMPILER_H
5
6
7
8
9
10
11#if defined(__GNUC__) && defined(__GNUC_MINOR__)
12# define QEMU_GNUC_PREREQ(maj, min) \
13 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
14#else
15# define QEMU_GNUC_PREREQ(maj, min) 0
16#endif
17
18#define QEMU_NORETURN __attribute__ ((__noreturn__))
19
20#if QEMU_GNUC_PREREQ(3, 4)
21#define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
22#else
23#define QEMU_WARN_UNUSED_RESULT
24#endif
25
26#if QEMU_GNUC_PREREQ(4, 0)
27#define QEMU_SENTINEL __attribute__((sentinel))
28#else
29#define QEMU_SENTINEL
30#endif
31
32#if QEMU_GNUC_PREREQ(4, 3)
33#define QEMU_ARTIFICIAL __attribute__((always_inline, artificial))
34#else
35#define QEMU_ARTIFICIAL
36#endif
37
38#if defined(_WIN32)
39# define QEMU_PACKED __attribute__((gcc_struct, packed))
40#else
41# define QEMU_PACKED __attribute__((packed))
42#endif
43
44#ifndef glue
45#define xglue(x, y) x ## y
46#define glue(x, y) xglue(x, y)
47#define stringify(s) tostring(s)
48#define tostring(s) #s
49#endif
50
51#ifndef likely
52#if __GNUC__ < 3
53#define __builtin_expect(x, n) (x)
54#endif
55
56#define likely(x) __builtin_expect(!!(x), 1)
57#define unlikely(x) __builtin_expect(!!(x), 0)
58#endif
59
60#ifndef container_of
61#define container_of(ptr, type, member) ({ \
62 const typeof(((type *) 0)->member) *__mptr = (ptr); \
63 (type *) ((char *) __mptr - offsetof(type, member));})
64#endif
65
66
67#ifdef __GNUC__
68#define DO_UPCAST(type, field, dev) ( __extension__ ( { \
69 char __attribute__((unused)) offset_must_be_zero[ \
70 -offsetof(type, field)]; \
71 container_of(dev, type, field);}))
72#else
73#define DO_UPCAST(type, field, dev) container_of(dev, type, field)
74#endif
75
76#define typeof_field(type, field) typeof(((type *)0)->field)
77#define type_check(t1,t2) ((t1*)0 - (t2*)0)
78
79#define QEMU_BUILD_BUG_ON(x) \
80 typedef char glue(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused));
81
82#if defined __GNUC__
83# if !QEMU_GNUC_PREREQ(4, 4)
84
85# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
86# else
87
88# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
89# if defined(_WIN32)
90
91
92# define __printf__ __gnu_printf__
93# endif
94# endif
95#else
96#define GCC_FMT_ATTR(n, m)
97#endif
98
99#endif
100