1 /* public domain */ 2 3 #ifndef COMPILER_H 4 #define COMPILER_H 5 6 #if defined __clang_analyzer__ || defined __COVERITY__ 7 #define QEMU_STATIC_ANALYSIS 1 8 #endif 9 10 /*---------------------------------------------------------------------------- 11 | The macro QEMU_GNUC_PREREQ tests for minimum version of the GNU C compiler. 12 | The code is a copy of SOFTFLOAT_GNUC_PREREQ, see softfloat-macros.h. 13 *----------------------------------------------------------------------------*/ 14 #if defined(__GNUC__) && defined(__GNUC_MINOR__) 15 # define QEMU_GNUC_PREREQ(maj, min) \ 16 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 17 #else 18 # define QEMU_GNUC_PREREQ(maj, min) 0 19 #endif 20 21 #define QEMU_NORETURN __attribute__ ((__noreturn__)) 22 23 #if QEMU_GNUC_PREREQ(3, 4) 24 #define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) 25 #else 26 #define QEMU_WARN_UNUSED_RESULT 27 #endif 28 29 #if QEMU_GNUC_PREREQ(4, 0) 30 #define QEMU_SENTINEL __attribute__((sentinel)) 31 #else 32 #define QEMU_SENTINEL 33 #endif 34 35 #if QEMU_GNUC_PREREQ(4, 3) 36 #define QEMU_ARTIFICIAL __attribute__((always_inline, artificial)) 37 #else 38 #define QEMU_ARTIFICIAL 39 #endif 40 41 #if defined(_WIN32) 42 # define QEMU_PACKED __attribute__((gcc_struct, packed)) 43 #else 44 # define QEMU_PACKED __attribute__((packed)) 45 #endif 46 47 #define QEMU_ALIGNED(X) __attribute__((aligned(X))) 48 49 #ifndef glue 50 #define xglue(x, y) x ## y 51 #define glue(x, y) xglue(x, y) 52 #define stringify(s) tostring(s) 53 #define tostring(s) #s 54 #endif 55 56 #ifndef likely 57 #if __GNUC__ < 3 58 #define __builtin_expect(x, n) (x) 59 #endif 60 61 #define likely(x) __builtin_expect(!!(x), 1) 62 #define unlikely(x) __builtin_expect(!!(x), 0) 63 #endif 64 65 #ifndef container_of 66 #define container_of(ptr, type, member) ({ \ 67 const typeof(((type *) 0)->member) *__mptr = (ptr); \ 68 (type *) ((char *) __mptr - offsetof(type, member));}) 69 #endif 70 71 /* Convert from a base type to a parent type, with compile time checking. */ 72 #ifdef __GNUC__ 73 #define DO_UPCAST(type, field, dev) ( __extension__ ( { \ 74 char __attribute__((unused)) offset_must_be_zero[ \ 75 -offsetof(type, field)]; \ 76 container_of(dev, type, field);})) 77 #else 78 #define DO_UPCAST(type, field, dev) container_of(dev, type, field) 79 #endif 80 81 #define typeof_field(type, field) typeof(((type *)0)->field) 82 #define type_check(t1,t2) ((t1*)0 - (t2*)0) 83 84 #define QEMU_BUILD_BUG_ON(x) \ 85 typedef char glue(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused)); 86 87 #if defined __GNUC__ 88 # if !QEMU_GNUC_PREREQ(4, 4) 89 /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */ 90 # define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m))) 91 # else 92 /* Use gnu_printf when supported (qemu uses standard format strings). */ 93 # define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m))) 94 # if defined(_WIN32) 95 /* Map __printf__ to __gnu_printf__ because we want standard format strings 96 * even when MinGW or GLib include files use __printf__. */ 97 # define __printf__ __gnu_printf__ 98 # endif 99 # endif 100 #else 101 #define GCC_FMT_ATTR(n, m) 102 #endif 103 104 #endif /* COMPILER_H */ 105