Zephyr API Documentation
4.0.0-rc2
A Scalable Open Source RTOS
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util_macro.h
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/*
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* Copyright (c) 2011-2014, Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_SYS_UTIL_MACROS_H_
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#define ZEPHYR_INCLUDE_SYS_UTIL_MACROS_H_
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#ifdef __cplusplus
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extern
"C"
{
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#endif
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/*
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* Most of the eldritch implementation details for all the macrobatics
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* below (APIs like IS_ENABLED(), COND_CODE_1(), etc.) are hidden away
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* in this file.
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*/
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#include <
zephyr/sys/util_internal.h
>
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#ifndef BIT
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#if defined(_ASMLANGUAGE)
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#define BIT(n) (1 << (n))
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#else
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#define BIT(n) (1UL << (n))
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#endif
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#endif
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#define BIT64(_n) (1ULL << (_n))
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#define WRITE_BIT(var, bit, set) \
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((var) = (set) ? ((var) | BIT(bit)) : ((var) & ~BIT(bit)))
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#define BIT_MASK(n) (BIT(n) - 1UL)
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#define BIT64_MASK(n) (BIT64(n) - 1ULL)
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#define IS_POWER_OF_TWO(x) (((x) != 0U) && (((x) & ((x) - 1U)) == 0U))
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#define IS_SHIFTED_BIT_MASK(m, s) (!(((m) >> (s)) & (((m) >> (s)) + 1U)))
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#define IS_BIT_MASK(m) IS_SHIFTED_BIT_MASK(m, 0)
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#define LSB_GET(value) ((value) & -(value))
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#define FIELD_GET(mask, value) (((value) & (mask)) / LSB_GET(mask))
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#define FIELD_PREP(mask, value) (((value) * LSB_GET(mask)) & (mask))
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#define IS_ENABLED(config_macro) Z_IS_ENABLED1(config_macro)
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/* INTERNAL: the first pass above is just to expand any existing
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* macros, we need the macro value to be e.g. a literal "1" at
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* expansion time in the next macro, not "(1)", etc... Standard
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* recursive expansion does not work.
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*/
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#define COND_CODE_1(_flag, _if_1_code, _else_code) \
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Z_COND_CODE_1(_flag, _if_1_code, _else_code)
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#define COND_CODE_0(_flag, _if_0_code, _else_code) \
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Z_COND_CODE_0(_flag, _if_0_code, _else_code)
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#define IF_ENABLED(_flag, _code) \
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COND_CODE_1(_flag, _code, ())
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#define IF_DISABLED(_flag, _code) \
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COND_CODE_1(_flag, (), _code)
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#define IS_EMPTY(...) Z_IS_EMPTY_(__VA_ARGS__)
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#define IS_EQ(a, b) Z_IS_EQ(a, b)
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#define LIST_DROP_EMPTY(...) \
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Z_LIST_DROP_FIRST(FOR_EACH(Z_LIST_NO_EMPTIES, (), __VA_ARGS__))
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#define EMPTY
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#define IDENTITY(V) V
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#define GET_ARG_N(N, ...) Z_GET_ARG_##N(__VA_ARGS__)
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#define GET_ARGS_LESS_N(N, ...) Z_GET_ARGS_LESS_##N(__VA_ARGS__)
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#define UTIL_OR(a, b) COND_CODE_1(UTIL_BOOL(a), (a), (b))
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#define UTIL_AND(a, b) COND_CODE_1(UTIL_BOOL(a), (b), (0))
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#define UTIL_INC(x) UTIL_PRIMITIVE_CAT(Z_UTIL_INC_, x)
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#define UTIL_DEC(x) UTIL_PRIMITIVE_CAT(Z_UTIL_DEC_, x)
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#define UTIL_X2(y) UTIL_PRIMITIVE_CAT(Z_UTIL_X2_, y)
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#define LISTIFY(LEN, F, sep, ...) UTIL_CAT(Z_UTIL_LISTIFY_, LEN)(F, sep, __VA_ARGS__)
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#define FOR_EACH(F, sep, ...) \
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Z_FOR_EACH(F, sep, REVERSE_ARGS(__VA_ARGS__))
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#define FOR_EACH_NONEMPTY_TERM(F, term, ...) \
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COND_CODE_0( \
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/* are there zero non-empty arguments ? */
\
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NUM_VA_ARGS_LESS_1(LIST_DROP_EMPTY(__VA_ARGS__, _)), \
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/* if so, expand to nothing */
\
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(), \
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/* otherwise, expand to: */
\
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(
/* FOR_EACH() on nonempty elements, */
\
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FOR_EACH(F, term, LIST_DROP_EMPTY(__VA_ARGS__)) \
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/* plus a final terminator */
\
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__DEBRACKET term \
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))
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#define FOR_EACH_IDX(F, sep, ...) \
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Z_FOR_EACH_IDX(F, sep, REVERSE_ARGS(__VA_ARGS__))
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#define FOR_EACH_FIXED_ARG(F, sep, fixed_arg, ...) \
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Z_FOR_EACH_FIXED_ARG(F, sep, fixed_arg, REVERSE_ARGS(__VA_ARGS__))
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#define FOR_EACH_IDX_FIXED_ARG(F, sep, fixed_arg, ...) \
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Z_FOR_EACH_IDX_FIXED_ARG(F, sep, fixed_arg, REVERSE_ARGS(__VA_ARGS__))
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#define REVERSE_ARGS(...) \
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Z_FOR_EACH_ENGINE(Z_FOR_EACH_EXEC, (,), Z_BYPASS, _, __VA_ARGS__)
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#define NUM_VA_ARGS_LESS_1(...) \
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NUM_VA_ARGS_LESS_1_IMPL(__VA_ARGS__, 63, 62, 61, \
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60, 59, 58, 57, 56, 55, 54, 53, 52, 51, \
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50, 49, 48, 47, 46, 45, 44, 43, 42, 41, \
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40, 39, 38, 37, 36, 35, 34, 33, 32, 31, \
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30, 29, 28, 27, 26, 25, 24, 23, 22, 21, \
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20, 19, 18, 17, 16, 15, 14, 13, 12, 11, \
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10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, ~)
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#define NUM_VA_ARGS(...) \
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COND_CODE_1(IS_EMPTY(__VA_ARGS__), (0), (UTIL_INC(NUM_VA_ARGS_LESS_1(__VA_ARGS__))))
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#define MACRO_MAP_CAT(...) MACRO_MAP_CAT_(__VA_ARGS__)
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#define MACRO_MAP_CAT_N(N, ...) MACRO_MAP_CAT_N_(N, __VA_ARGS__)
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#ifdef __cplusplus
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}
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#endif
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#endif
/* ZEPHYR_INCLUDE_SYS_UTIL_MACROS_H_ */
util_internal.h
Misc utilities.
zephyr
sys
util_macro.h
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