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7#ifndef COMPILER_H
8#define COMPILER_H
9
10#if defined __clang_analyzer__ || defined __COVERITY__
11#define QEMU_STATIC_ANALYSIS 1
12#endif
13
14
15
16
17
18#if defined(__GNUC__) && defined(__GNUC_MINOR__)
19# define QEMU_GNUC_PREREQ(maj, min) \
20 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
21#else
22# define QEMU_GNUC_PREREQ(maj, min) 0
23#endif
24
25#define QEMU_NORETURN __attribute__ ((__noreturn__))
26
27#define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
28
29#define QEMU_SENTINEL __attribute__((sentinel))
30
31#if QEMU_GNUC_PREREQ(4, 3)
32#define QEMU_ARTIFICIAL __attribute__((always_inline, artificial))
33#else
34#define QEMU_ARTIFICIAL
35#endif
36
37#if defined(_WIN32)
38# define QEMU_PACKED __attribute__((gcc_struct, packed))
39#else
40# define QEMU_PACKED __attribute__((packed))
41#endif
42
43#define QEMU_ALIGNED(X) __attribute__((aligned(X)))
44
45#ifndef glue
46#define xglue(x, y) x ## y
47#define glue(x, y) xglue(x, y)
48#define stringify(s) tostring(s)
49#define tostring(s) #s
50#endif
51
52#ifndef likely
53#if __GNUC__ < 3
54#define __builtin_expect(x, n) (x)
55#endif
56
57#define likely(x) __builtin_expect(!!(x), 1)
58#define unlikely(x) __builtin_expect(!!(x), 0)
59#endif
60
61#ifndef container_of
62#define container_of(ptr, type, member) ({ \
63 const typeof(((type *) 0)->member) *__mptr = (ptr); \
64 (type *) ((char *) __mptr - offsetof(type, member));})
65#endif
66
67
68#ifdef __GNUC__
69#define DO_UPCAST(type, field, dev) ( __extension__ ( { \
70 char __attribute__((unused)) offset_must_be_zero[ \
71 -offsetof(type, field)]; \
72 container_of(dev, type, field);}))
73#else
74#define DO_UPCAST(type, field, dev) container_of(dev, type, field)
75#endif
76
77#define typeof_field(type, field) typeof(((type *)0)->field)
78#define type_check(t1,t2) ((t1*)0 - (t2*)0)
79
80#define QEMU_BUILD_BUG_ON_STRUCT(x) \
81 struct { \
82 int:(x) ? -1 : 1; \
83 }
84
85#if defined(CONFIG_STATIC_ASSERT)
86#define QEMU_BUILD_BUG_ON(x) _Static_assert(!(x), "not expecting: " #x)
87#elif defined(__COUNTER__)
88#define QEMU_BUILD_BUG_ON(x) typedef QEMU_BUILD_BUG_ON_STRUCT(x) \
89 glue(qemu_build_bug_on__, __COUNTER__) __attribute__((unused))
90#else
91#define QEMU_BUILD_BUG_ON(x)
92#endif
93
94#define QEMU_BUILD_BUG_ON_ZERO(x) (sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)) - \
95 sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)))
96
97#if defined __GNUC__
98# if !QEMU_GNUC_PREREQ(4, 4)
99
100# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
101# else
102
103# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
104# if defined(_WIN32)
105
106
107# define __printf__ __gnu_printf__
108# endif
109# endif
110#else
111#define GCC_FMT_ATTR(n, m)
112#endif
113
114#endif
115