7 /*----------------------------------------------------------------------------
8 | The macro QEMU_GNUC_PREREQ tests for minimum version of the GNU C compiler.
9 | The code is a copy of SOFTFLOAT_GNUC_PREREQ, see softfloat-macros.h.
10 *----------------------------------------------------------------------------*/
11 #if defined(__GNUC__) && defined(__GNUC_MINOR__)
12 # define QEMU_GNUC_PREREQ(maj, min) \
13 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
15 # define QEMU_GNUC_PREREQ(maj, min) 0
18 #define QEMU_NORETURN __attribute__ ((__noreturn__))
20 #if QEMU_GNUC_PREREQ(3, 4)
21 #define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
23 #define QEMU_WARN_UNUSED_RESULT
26 #if QEMU_GNUC_PREREQ(4, 0)
27 #define QEMU_SENTINEL __attribute__((sentinel))
32 #if QEMU_GNUC_PREREQ(4, 3)
33 #define QEMU_ARTIFICIAL __attribute__((always_inline, artificial))
35 #define QEMU_ARTIFICIAL
39 # define QEMU_PACKED __attribute__((gcc_struct, packed))
41 # define QEMU_PACKED __attribute__((packed))
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
53 #define __builtin_expect(x, n) (x)
56 #define likely(x) __builtin_expect(!!(x), 1)
57 #define unlikely(x) __builtin_expect(!!(x), 0)
61 #define container_of(ptr, type, member) ({ \
62 const typeof(((type *) 0)->member) *__mptr = (ptr); \
63 (type *) ((char *) __mptr - offsetof(type, member));})
66 /* Convert from a base type to a parent type, with compile time checking. */
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);}))
73 #define DO_UPCAST(type, field, dev) container_of(dev, type, field)
76 #define typeof_field(type, field) typeof(((type *)0)->field)
77 #define type_check(t1,t2) ((t1*)0 - (t2*)0)
79 #define QEMU_BUILD_BUG_ON(x) \
80 typedef char glue(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused));
83 # if !QEMU_GNUC_PREREQ(4, 4)
84 /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
85 # define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
87 /* Use gnu_printf when supported (qemu uses standard format strings). */
88 # define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
90 /* Map __printf__ to __gnu_printf__ because we want standard format strings
91 * even when MinGW or GLib include files use __printf__. */
92 # define __printf__ __gnu_printf__
96 #define GCC_FMT_ATTR(n, m)
99 #endif /* COMPILER_H */