1 /* public domain */ 2 3 #ifndef COMPILER_H 4 #define COMPILER_H 5 6 #include "config-host.h" 7 8 /*---------------------------------------------------------------------------- 9 | The macro QEMU_GNUC_PREREQ tests for minimum version of the GNU C compiler. 10 | The code is a copy of SOFTFLOAT_GNUC_PREREQ, see softfloat-macros.h. 11 *----------------------------------------------------------------------------*/ 12 #if defined(__GNUC__) && defined(__GNUC_MINOR__) 13 # define QEMU_GNUC_PREREQ(maj, min) \ 14 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 15 #else 16 # define QEMU_GNUC_PREREQ(maj, min) 0 17 #endif 18 19 #define QEMU_NORETURN __attribute__ ((__noreturn__)) 20 21 #if QEMU_GNUC_PREREQ(3, 4) 22 #define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) 23 #else 24 #define QEMU_WARN_UNUSED_RESULT 25 #endif 26 27 #if QEMU_GNUC_PREREQ(4, 0) 28 #define QEMU_SENTINEL __attribute__((sentinel)) 29 #else 30 #define QEMU_SENTINEL 31 #endif 32 33 #if QEMU_GNUC_PREREQ(4, 3) 34 #define QEMU_ARTIFICIAL __attribute__((always_inline, artificial)) 35 #else 36 #define QEMU_ARTIFICIAL 37 #endif 38 39 #if defined(_WIN32) 40 # define QEMU_PACKED __attribute__((gcc_struct, packed)) 41 #else 42 # define QEMU_PACKED __attribute__((packed)) 43 #endif 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 /* Convert from a base type to a parent type, with compile time checking. */ 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 #ifndef always_inline 81 #if !((__GNUC__ < 3) || defined(__APPLE__)) 82 #ifdef __OPTIMIZE__ 83 #undef inline 84 #define inline __attribute__ (( always_inline )) __inline__ 85 #endif 86 #endif 87 #else 88 #undef inline 89 #define inline always_inline 90 #endif 91 92 #define QEMU_BUILD_BUG_ON(x) \ 93 typedef char glue(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused)); 94 95 #if defined __GNUC__ 96 # if !QEMU_GNUC_PREREQ(4, 4) 97 /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */ 98 # define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m))) 99 # else 100 /* Use gnu_printf when supported (qemu uses standard format strings). */ 101 # define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m))) 102 # if defined(_WIN32) 103 /* Map __printf__ to __gnu_printf__ because we want standard format strings 104 * even when MinGW or GLib include files use __printf__. */ 105 # define __printf__ __gnu_printf__ 106 # endif 107 # endif 108 #else 109 #define GCC_FMT_ATTR(n, m) 110 #endif 111 112 #endif /* COMPILER_H */ 113