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mirror_frr/lib/compiler.h
David Lamparter 48373d46f1 lib: add some macro helpers 
Macro soup, now with 50% more macros.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
2019-09-03 17:15:17 +02:00

349 lines
12 KiB
C
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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)
# if __has_builtin(assume)
# define assume(x) __builtin_assume(x)
# endif
#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)
# define assume(x) do { if (!(x)) __builtin_unreachable(); } while (0)
#endif
#if __GNUC__ < 5
# define __has_attribute(x) 0
#endif
#if __GNUC__ >= 7
# define _FALLTHROUGH __attribute__((fallthrough));
#endif
#endif
#if __has_attribute(hot)
# define _OPTIMIZE_HOT __attribute__((hot))
#else
# define _OPTIMIZE_HOT
#endif
#if __has_attribute(optimize)
# define _OPTIMIZE_O3 __attribute__((optimize("3")))
#else
# define _OPTIMIZE_O3
#endif
#define OPTIMIZE _OPTIMIZE_O3 _OPTIMIZE_HOT
#if !defined(__GNUC__)
#error module code needs GCC visibility extensions
#elif __GNUC__ < 4
#error module code needs GCC visibility extensions
#else
# define DSO_PUBLIC __attribute__ ((visibility ("default")))
# define DSO_SELF __attribute__ ((visibility ("protected")))
# define DSO_LOCAL __attribute__ ((visibility ("hidden")))
#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
#ifndef assume
#define assume(x)
#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))
/* variadic macros, use like:
* #define V_0() ...
* #define V_1(x) ...
* #define V(...) MACRO_VARIANT(V, ##__VA_ARGS__)(__VA_ARGS__)
*/
#define _MACRO_VARIANT(A0,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10, N, ...) N
#define _CONCAT2(a, b) a ## b
#define _CONCAT(a, b) _CONCAT2(a,b)
#define MACRO_VARIANT(NAME, ...) \
_CONCAT(NAME, _MACRO_VARIANT(0, ##__VA_ARGS__, \
_10, _9, _8, _7, _6, _5, _4, _3, _2, _1, _0))
#define NAMECTR(name) _CONCAT(name, __COUNTER__)
/* per-arg repeat macros, use like:
* #define PERARG(n) ...n...
* #define FOO(...) MACRO_REPEAT(PERARG, ##__VA_ARGS__)
*/
#define _MACRO_REPEAT_0(NAME)
#define _MACRO_REPEAT_1(NAME, A1) \
NAME(A1)
#define _MACRO_REPEAT_2(NAME, A1, A2) \
NAME(A1) NAME(A2)
#define _MACRO_REPEAT_3(NAME, A1, A2, A3) \
NAME(A1) NAME(A2) NAME(A3)
#define _MACRO_REPEAT_4(NAME, A1, A2, A3, A4) \
NAME(A1) NAME(A2) NAME(A3) NAME(A4)
#define _MACRO_REPEAT_5(NAME, A1, A2, A3, A4, A5) \
NAME(A1) NAME(A2) NAME(A3) NAME(A4) NAME(A5)
#define _MACRO_REPEAT_6(NAME, A1, A2, A3, A4, A5, A6) \
NAME(A1) NAME(A2) NAME(A3) NAME(A4) NAME(A5) NAME(A6)
#define _MACRO_REPEAT_7(NAME, A1, A2, A3, A4, A5, A6, A7) \
NAME(A1) NAME(A2) NAME(A3) NAME(A4) NAME(A5) NAME(A6) NAME(A7)
#define _MACRO_REPEAT_8(NAME, A1, A2, A3, A4, A5, A6, A7, A8) \
NAME(A1) NAME(A2) NAME(A3) NAME(A4) NAME(A5) NAME(A6) NAME(A7) NAME(A8)
#define MACRO_REPEAT(NAME, ...) \
MACRO_VARIANT(_MACRO_REPEAT, ##__VA_ARGS__)(NAME, ##__VA_ARGS__)
/*
* 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; \
})
#define numcmp(a, b) \
({ \
typeof(a) _cmp_a = (a); \
typeof(b) _cmp_b = (b); \
(_cmp_a < _cmp_b) ? -1 : ((_cmp_a > _cmp_b) ? 1 : 0); \
})
#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
#ifdef container_of
#undef container_of
#endif
#if !(defined(__cplusplus) || defined(test__cplusplus))
/* 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);
*/
#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)); \
}) \
))
#else
/* current C++ compilers don't have the builtins used above; so this version
* of the macro doesn't do the const check. */
#define container_of(ptr, type, member) \
({ \
const typeof(((type *)0)->member) *__mptr = (ptr); \
(type *)((char *)__mptr - offsetof(type, member)); \
})
#endif
#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]))
/* sigh. this is so ugly, it overflows and wraps to being nice again.
*
* printfrr() supports "%Ld" for <int64_t>, whatever that is typedef'd to.
* However, gcc & clang think that "%Ld" is <long long>, which doesn't quite
* match up since int64_t is <long> on a lot of 64-bit systems.
*
* If we have _FRR_ATTRIBUTE_PRINTFRR, we loaded a compiler plugin that
* replaces the whole format checking bits with a custom version that
* understands "%Ld" (along with "%pI4" and co.), so we don't need to do
* anything.
*
* If we don't have that attribute... we still want -Wformat to work. So,
* this is the "f*ck it" approach and we just redefine int64_t to always be
* <long long>. This should work until such a time that <long long> is
* something else (e.g. 128-bit integer)... let's just guard against that
* with the _Static_assert below and work with the world we have right now,
* where <long long> is always 64-bit.
*/
/* these need to be included before any of the following, so we can
* "overwrite" things.
*/
#include <stdint.h>
#include <inttypes.h>
#ifdef _FRR_ATTRIBUTE_PRINTFRR
#define PRINTFRR(a, b) __attribute__((printfrr(a, b)))
#else /* !_FRR_ATTRIBUTE_PRINTFRR */
#define PRINTFRR(a, b) __attribute__((format(printf, a, b)))
/* these should be typedefs, but might also be #define */
#ifdef uint64_t
#undef uint64_t
#endif
#ifdef int64_t
#undef int64_t
#endif
/* can't overwrite the typedef, but we can replace int64_t with _int64_t */
typedef unsigned long long _uint64_t;
#define uint64_t _uint64_t
typedef signed long long _int64_t;
#define int64_t _int64_t
/* if this breaks, 128-bit machines may have entered reality (or <long long>
* is something weird)
*/
#if __STDC_VERSION__ >= 201112L
_Static_assert(sizeof(_uint64_t) == 8 && sizeof(_int64_t) == 8,
"nobody expects the spanish intquisition");
#endif
/* since we redefined int64_t, we also need to redefine PRI*64 */
#undef PRIu64
#undef PRId64
#undef PRIx64
#define PRIu64 "llu"
#define PRId64 "lld"
#define PRIx64 "llx"
#endif /* !_FRR_ATTRIBUTE_PRINTFRR */
#ifdef __cplusplus
}
#endif
#endif /* _FRR_COMPILER_H */
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