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/* 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 */
#ifndef __CROS_EC_COMPILE_TIME_MACROS_H
#define __CROS_EC_COMPILE_TIME_MACROS_H
/* 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)))
/* Check that the value is an array (not a pointer) */
#define _IS_ARRAY(arr) \
!__builtin_types_compatible_p(typeof(arr), typeof(&(arr)[0]))
/**
* ARRAY_SIZE - Number of elements in an array.
*
* This version is type-safe and will not allow pointers, causing a
* compile-time divide by zero error if a pointer is passed.
*/
#define ARRAY_SIZE(arr) \
BUILD_CHECK_INLINE(sizeof(arr) / sizeof((arr)[0]), _IS_ARRAY(arr))
/* Make for loops that iterate over pointers to array entries more readable */
#define ARRAY_BEGIN(array) \
({ \
BUILD_ASSERT(_IS_ARRAY(array), \
"ARRAY_BEGIN is only compatible with arrays."); \
(array); \
})
#define ARRAY_END(array) ((array) + ARRAY_SIZE(array))
/* Just in case - http://gcc.gnu.org/onlinedocs/gcc/Offsetof.html */
#ifndef offsetof
#define offsetof(type, member) __builtin_offsetof(type, member)
#endif
#define member_size(type, member) sizeof(((type *)0)->member)
/*
* Bit operation macros.
*/
#define BIT(nr) (1U << (nr))
#define BIT_ULL(nr) (1ULL << (nr))
/*
* Create a bit mask from least significant bit |l|
* to bit |h|, inclusive.
*
* Examples:
* GENMASK(31, 0) ==> 0xFF_FF_FF_FF
* GENMASK(3, 0) ==> 0x00_00_00_0F
* GENMASK(7, 4) ==> 0x00_00_00_F0
* GENMASK(b, b) ==> BIT(b)
*
* Note that we shift after using BIT() to avoid compiler
* warnings for BIT(31+1).
*/
#define GENMASK(h, l) (((BIT(h)<<1) - 1) ^ (BIT(l) - 1))
#define GENMASK_ULL(h, l) (((BIT_ULL(h)<<1) - 1) ^ (BIT_ULL(l) - 1))
#endif /* __CROS_EC_COMPILE_TIME_MACROS_H */
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