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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
#include <assert.h>
#include "c99_compat.h"
/* Compute the size of an array */
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
#endif
/* For compatibility with Clang's __has_builtin() */
#ifndef __has_builtin
# define __has_builtin(x) 0
#endif
/**
* __builtin_expect macros
*/
#if !defined(HAVE___BUILTIN_EXPECT)
# define __builtin_expect(x, y) (x)
#endif
#ifndef likely
# ifdef HAVE___BUILTIN_EXPECT
# 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.
*/
#ifdef HAVE___BUILTIN_UNREACHABLE
#define unreachable(str) \
do { \
assert(!str); \
__builtin_unreachable(); \
} while (0)
#elif defined (_MSC_VER)
#define unreachable(str) \
do { \
assert(!str); \
__assume(0); \
} while (0)
#else
#define unreachable(str) assert(!str)
#endif
/**
* Assume macro. Useful for expressing our assumptions to the compiler,
* typically for purposes of silencing warnings.
*/
#if __has_builtin(__builtin_assume)
#define assume(expr) \
do { \
assert(expr); \
__builtin_assume(expr); \
} while (0)
#elif defined HAVE___BUILTIN_UNREACHABLE
#define assume(expr) ((expr) ? ((void) 0) \
: (assert(!"assumption failed"), \
__builtin_unreachable()))
#elif defined (_MSC_VER)
#define assume(expr) __assume(expr)
#else
#define assume(expr) assert(expr)
#endif
/* Attribute const is used for functions that have no effects other than their
* return value, and only rely on the argument values to compute the return
* value. As a result, calls to it can be CSEed. Note that using memory
* pointed to by the arguments is not allowed for const functions.
*/
#ifdef HAVE_FUNC_ATTRIBUTE_CONST
#define ATTRIBUTE_CONST __attribute__((__const__))
#else
#define ATTRIBUTE_CONST
#endif
#ifdef HAVE_FUNC_ATTRIBUTE_FLATTEN
#define FLATTEN __attribute__((__flatten__))
#else
#define FLATTEN
#endif
#ifdef HAVE_FUNC_ATTRIBUTE_FORMAT
#define PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a)))
#else
#define PRINTFLIKE(f, a)
#endif
#ifdef HAVE_FUNC_ATTRIBUTE_MALLOC
#define MALLOCLIKE __attribute__((__malloc__))
#else
#define MALLOCLIKE
#endif
/* Used to optionally mark structures with misaligned elements or size as
* packed, to trade off performance for space.
*/
#ifdef HAVE_FUNC_ATTRIBUTE_PACKED
#define PACKED __attribute__((__packed__))
#else
#define PACKED
#endif
/* Attribute pure is used for functions that have no effects other than their
* return value. As a result, calls to it can be dead code eliminated.
*/
#ifdef HAVE_FUNC_ATTRIBUTE_PURE
#define ATTRIBUTE_PURE __attribute__((__pure__))
#else
#define ATTRIBUTE_PURE
#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
/**
* PUBLIC/USED macros
*
* If we build the library with gcc's -fvisibility=hidden flag, we'll
* use the PUBLIC macro to mark functions that are to be exported.
*
* We also need to define a USED attribute, so the optimizer doesn't
* inline a static function that we later use in an alias. - ajax
*/
#ifndef PUBLIC
# if defined(__GNUC__)
# define PUBLIC __attribute__((visibility("default")))
# define USED __attribute__((used))
# elif defined(_MSC_VER)
# define PUBLIC __declspec(dllexport)
# define USED
# else
# define PUBLIC
# define USED
# endif
#endif
#ifdef HAVE_FUNC_ATTRIBUTE_UNUSED
#define UNUSED __attribute__((unused))
#else
#define UNUSED
#endif
#define MAYBE_UNUSED UNUSED
#ifdef HAVE_FUNC_ATTRIBUTE_WARN_UNUSED_RESULT
#define MUST_CHECK __attribute__((warn_unused_result))
#else
#define MUST_CHECK
#endif
/** Compute ceiling of integer quotient of A divided by B. */
#define DIV_ROUND_UP( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
#endif /* UTIL_MACROS_H */
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