blob: cdf8b1998b2dc72060ee3aca5ca592649a8b8901 [file] [log] [blame]
/* Copyright 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
/* Handy clever tricks */
/* Test an important condition at compile time, not run time */
#define _BA1_(cond, file, line, msg) \
_Static_assert(cond, file ":" #line ": " msg)
#define _BA0_(c, f, l, msg) _BA1_(c, f, l, msg)
/* Pass in an option message to display after condition */
#define BUILD_ASSERT(cond, ...) _BA0_(cond, __FILE__, __LINE__, __VA_ARGS__)
* Test an important condition inside code path at run time, taking advantage of
* -Werror=div-by-zero.
#define BUILD_CHECK_INLINE(value, cond_true) ((value) / (!!(cond_true)))
/* Number of elements in an array */
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
/* Make for loops that iterate over pointers to array entries more readable */
#define ARRAY_BEGIN(array) (array)
#define ARRAY_END(array) ((array) + ARRAY_SIZE(array))
/* Just in case - */
#ifndef offsetof
#define offsetof(type, member) __builtin_offsetof(type, member)
#define member_size(type, member) sizeof(((type *)0)->member)
* Bit operation macros.
#define BIT(nr) (1U << (nr))
#define BIT_ULL(nr) (1ULL << (nr))