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/*
* Copyright (c) 2015-2017 David Lamparter, for NetDEF, Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _FRR_COMPILER_H
#define _FRR_COMPILER_H
#ifdef __cplusplus
extern "C" {
#endif
/* function attributes, use like
* void prototype(void) __attribute__((_CONSTRUCTOR(100)));
*/
#if defined(__clang__)
#if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 5)
# define _RET_NONNULL , returns_nonnull
#endif
#if __has_attribute(fallthrough)
# define _FALLTHROUGH __attribute__((fallthrough));
#endif
# define _CONSTRUCTOR(x) constructor(x)
# define _DEPRECATED(x) deprecated(x)
#elif defined(__GNUC__)
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
# define _RET_NONNULL , returns_nonnull
#endif
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
# define _CONSTRUCTOR(x) constructor(x)
# define _DESTRUCTOR(x) destructor(x)
# define _ALLOC_SIZE(x) alloc_size(x)
#endif
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
# define _DEPRECATED(x) deprecated(x)
#endif
#if __GNUC__ >= 7
# define _FALLTHROUGH __attribute__((fallthrough));
#endif
#endif
#ifdef __sun
/* Solaris doesn't do constructor priorities due to linker restrictions */
#undef _CONSTRUCTOR
#undef _DESTRUCTOR
#endif
/* fallback versions */
#ifndef _RET_NONNULL
# define _RET_NONNULL
#endif
#ifndef _CONSTRUCTOR
# define _CONSTRUCTOR(x) constructor
#endif
#ifndef _DESTRUCTOR
# define _DESTRUCTOR(x) destructor
#endif
#ifndef _ALLOC_SIZE
# define _ALLOC_SIZE(x)
#endif
#ifndef _FALLTHROUGH
#define _FALLTHROUGH
#endif
#ifndef _DEPRECATED
#define _DEPRECATED(x) deprecated
#endif
/* pure = function does not modify memory & return value is the same if
* memory hasn't changed (=> allows compiler to optimize)
*
* Mostly autodetected by the compiler if function body is available (i.e.
* static inline functions in headers). Since that implies it should only be
* used in headers for non-inline functions, the "extern" is included here.
*/
#define ext_pure extern __attribute__((pure))
/* for helper functions defined inside macros */
#define macro_inline static inline __attribute__((unused))
#define macro_pure static inline __attribute__((unused, pure))
/*
* for warnings on macros, put in the macro content like this:
* #define MACRO BLA CPP_WARN("MACRO has been deprecated")
*/
#define CPP_STR(X) #X
#if defined(__ICC)
#define CPP_NOTICE(text) _Pragma(CPP_STR(message __FILE__ ": " text))
#define CPP_WARN(text) CPP_NOTICE(text)
#elif (defined(__GNUC__) \
&& (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) \
|| (defined(__clang__) \
&& (__clang_major__ >= 4 \
|| (__clang_major__ == 3 && __clang_minor__ >= 5)))
#define CPP_WARN(text) _Pragma(CPP_STR(GCC warning text))
#define CPP_NOTICE(text) _Pragma(CPP_STR(message text))
#else
#define CPP_WARN(text)
#define CPP_NOTICE(text)
#endif
/* MAX / MIN are not commonly defined, but useful */
/* note: glibc sys/param.h has #define MIN(a,b) (((a)<(b))?(a):(b)) */
#ifdef MAX
#undef MAX
#endif
#define MAX(a, b) \
({ \
typeof(a) _max_a = (a); \
typeof(b) _max_b = (b); \
_max_a > _max_b ? _max_a : _max_b; \
})
#ifdef MIN
#undef MIN
#endif
#define MIN(a, b) \
({ \
typeof(a) _min_a = (a); \
typeof(b) _min_b = (b); \
_min_a < _min_b ? _min_a : _min_b; \
})
#ifndef offsetof
#ifdef __compiler_offsetof
#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE,MEMBER)
#else
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
#endif
/* this variant of container_of() retains 'const' on pointers without needing
* to be told to do so. The following will all work without warning:
*
* struct member *p;
* const struct member *cp;
*
* const struct cont *x = container_of(cp, struct cont, member);
* const struct cont *x = container_of(cp, const struct cont, member);
* const struct cont *x = container_of(p, struct cont, member);
* const struct cont *x = container_of(p, const struct cont, member);
* struct cont *x = container_of(p, struct cont, member);
*
* but the following will generate warnings about stripping const:
*
* struct cont *x = container_of(cp, struct cont, member);
* struct cont *x = container_of(cp, const struct cont, member);
* struct cont *x = container_of(p, const struct cont, member);
*/
#ifdef container_of
#undef container_of
#endif
#define container_of(ptr, type, member) \
(__builtin_choose_expr( \
__builtin_types_compatible_p(typeof(&((type *)0)->member), \
typeof(ptr)) \
|| __builtin_types_compatible_p(void *, typeof(ptr)), \
({ \
typeof(((type *)0)->member) *__mptr = (void *)(ptr); \
(type *)((char *)__mptr - offsetof(type, member)); \
}), \
({ \
typeof(((const type *)0)->member) *__mptr = (ptr); \
(const type *)((const char *)__mptr - \
offsetof(type, member)); \
}) \
))
#define container_of_null(ptr, type, member) \
({ \
typeof(ptr) _tmp = (ptr); \
_tmp ? container_of(_tmp, type, member) : NULL; \
})
#define array_size(ar) (sizeof(ar) / sizeof(ar[0]))
#ifdef __cplusplus
}
#endif
#endif /* _FRR_COMPILER_H */
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