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/*
* Copyright © 2014 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef UTIL_MACROS_H
#define UTIL_MACROS_H
/* Compute the size of an array */
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
#endif
/**
* __builtin_expect macros
*/
#if !defined(__GNUC__)
# define __builtin_expect(x, y) (x)
#endif
#ifndef likely
# ifdef __GNUC__
# define likely(x) __builtin_expect(!!(x), 1)
# define unlikely(x) __builtin_expect(!!(x), 0)
# else
# define likely(x) (x)
# define unlikely(x) (x)
# endif
#endif
/**
* Static (compile-time) assertion.
* Basically, use COND to dimension an array. If COND is false/zero the
* array size will be -1 and we'll get a compilation error.
*/
#define STATIC_ASSERT(COND) \
do { \
(void) sizeof(char [1 - 2*!(COND)]); \
} while (0)
/**
* Unreachable macro. Useful for suppressing "control reaches end of non-void
* function" warnings.
*/
#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 5
#define unreachable(str) \
do { \
assert(!str); \
__builtin_unreachable(); \
} while (0)
#elif (defined(__clang__) && defined(__has_builtin))
# if __has_builtin(__builtin_unreachable)
# define unreachable(str) \
do { \
assert(!str); \
__builtin_unreachable(); \
} while (0)
# endif
#endif
#ifndef unreachable
#define unreachable(str)
#endif
#if (__GNUC__ >= 3)
#define PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a)))
#else
#define PRINTFLIKE(f, a)
#endif
/* Used to optionally mark structures with misaligned elements or size as
* packed, to trade off performance for space.
*/
#if (__GNUC__ >= 3)
#define PACKED __attribute__((__packed__))
#else
#define PACKED
#endif
#ifdef __cplusplus
/**
* Macro function that evaluates to true if T is a trivially
* destructible type -- that is, if its (non-virtual) destructor
* performs no action and all member variables and base classes are
* trivially destructible themselves.
*/
# if defined(__GNUC__)
# if ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)))
# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
# endif
# elif (defined(__clang__) && defined(__has_feature))
# if __has_feature(has_trivial_destructor)
# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
# endif
# endif
# ifndef HAS_TRIVIAL_DESTRUCTOR
/* It's always safe (if inefficient) to assume that a
* destructor is non-trivial.
*/
# define HAS_TRIVIAL_DESTRUCTOR(T) (false)
# endif
#endif
#endif /* UTIL_MACROS_H */
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