133 lines
5.2 KiB
C
133 lines
5.2 KiB
C
/*
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* Copyright (c) 2011-2014, Wind River Systems, Inc.
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* Copyright (c) 2020, Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Misc utilities
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*
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* Repetitive or obscure helper macros needed by sys/util.h.
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*/
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#ifndef ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_
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#define ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_
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#include "util_loops.h"
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/* IS_ENABLED() helpers */
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/* This is called from IS_ENABLED(), and sticks on a "_XXXX" prefix,
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* it will now be "_XXXX1" if config_macro is "1", or just "_XXXX" if it's
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* undefined.
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* ENABLED: Z_IS_ENABLED2(_XXXX1)
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* DISABLED Z_IS_ENABLED2(_XXXX)
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*/
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#define Z_IS_ENABLED1(config_macro) Z_IS_ENABLED2(_XXXX##config_macro)
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/* Here's the core trick, we map "_XXXX1" to "_YYYY," (i.e. a string
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* with a trailing comma), so it has the effect of making this a
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* two-argument tuple to the preprocessor only in the case where the
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* value is defined to "1"
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* ENABLED: _YYYY, <--- note comma!
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* DISABLED: _XXXX
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*/
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#define _XXXX1 _YYYY,
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/* Then we append an extra argument to fool the gcc preprocessor into
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* accepting it as a varargs macro.
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* arg1 arg2 arg3
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* ENABLED: Z_IS_ENABLED3(_YYYY, 1, 0)
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* DISABLED Z_IS_ENABLED3(_XXXX 1, 0)
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*/
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#define Z_IS_ENABLED2(one_or_two_args) Z_IS_ENABLED3(one_or_two_args 1, 0)
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/* And our second argument is thus now cooked to be 1 in the case
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* where the value is defined to 1, and 0 if not:
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*/
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#define Z_IS_ENABLED3(ignore_this, val, ...) val
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/* Used internally by COND_CODE_1 and COND_CODE_0. */
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#define Z_COND_CODE_1(_flag, _if_1_code, _else_code) \
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__COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
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#define Z_COND_CODE_0(_flag, _if_0_code, _else_code) \
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__COND_CODE(_ZZZZ##_flag, _if_0_code, _else_code)
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#define _ZZZZ0 _YYYY,
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#define __COND_CODE(one_or_two_args, _if_code, _else_code) \
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__GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
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/* Gets second argument and removes brackets around that argument. It
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* is expected that the parameter is provided in brackets/parentheses.
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*/
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#define __GET_ARG2_DEBRACKET(ignore_this, val, ...) __DEBRACKET val
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/* Used to remove brackets from around a single argument. */
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#define __DEBRACKET(...) __VA_ARGS__
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/* Used by IS_EMPTY() */
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#define Z_IS_EMPTY_(...) Z_IS_EMPTY__(__VA_ARGS__)
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#define Z_IS_EMPTY__(a, ...) Z_IS_EMPTY___(_ZZ##a##ZZ0, __VA_ARGS__)
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#define Z_IS_EMPTY___(...) GET_ARG_N(3, __VA_ARGS__)
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/* Used by LIST_DROP_EMPTY() */
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/* Adding ',' after each element would add empty element at the end of
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* list, which is hard to remove, so instead precede each element with ',',
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* this way first element is empty, and this one is easy to drop.
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*/
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#define Z_LIST_ADD_ELEM(e) EMPTY, e
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#define Z_LIST_DROP_FIRST(...) GET_ARGS_LESS_N(1, __VA_ARGS__)
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#define Z_LIST_NO_EMPTIES(e) \
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COND_CODE_1(IS_EMPTY(e), (), (Z_LIST_ADD_ELEM(e)))
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#define UTIL_CAT(a, ...) UTIL_PRIMITIVE_CAT(a, __VA_ARGS__)
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#define UTIL_PRIMITIVE_CAT(a, ...) a##__VA_ARGS__
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#define UTIL_CHECK_N(x, n, ...) n
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#define UTIL_CHECK(...) UTIL_CHECK_N(__VA_ARGS__, 0,)
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#define UTIL_NOT(x) UTIL_CHECK(UTIL_PRIMITIVE_CAT(UTIL_NOT_, x))
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#define UTIL_NOT_0 ~, 1,
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#define UTIL_COMPL(b) UTIL_PRIMITIVE_CAT(UTIL_COMPL_, b)
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#define UTIL_COMPL_0 1
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#define UTIL_COMPL_1 0
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#define UTIL_BOOL(x) UTIL_COMPL(UTIL_NOT(x))
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#define UTIL_EVAL(...) __VA_ARGS__
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#define UTIL_EXPAND(...) __VA_ARGS__
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#define UTIL_REPEAT(...) UTIL_LISTIFY(__VA_ARGS__)
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/* Implementation details for NUM_VA_ARGS_LESS_1 */
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#define NUM_VA_ARGS_LESS_1_IMPL( \
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_ignored, \
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_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, \
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_11, _12, _13, _14, _15, _16, _17, _18, _19, _20, \
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_21, _22, _23, _24, _25, _26, _27, _28, _29, _30, \
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_31, _32, _33, _34, _35, _36, _37, _38, _39, _40, \
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_41, _42, _43, _44, _45, _46, _47, _48, _49, _50, \
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_51, _52, _53, _54, _55, _56, _57, _58, _59, _60, \
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_61, _62, N, ...) N
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/* Used by MACRO_MAP_CAT */
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#define MACRO_MAP_CAT_(...) \
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/* To make sure it works also for 2 arguments in total */ \
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MACRO_MAP_CAT_N(NUM_VA_ARGS_LESS_1(__VA_ARGS__), __VA_ARGS__)
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#define MACRO_MAP_CAT_N_(N, ...) UTIL_CAT(MACRO_MC_, N)(__VA_ARGS__,)
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#define MACRO_MC_0(...)
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#define MACRO_MC_1(m, a, ...) m(a)
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#define MACRO_MC_2(m, a, ...) UTIL_CAT(m(a), MACRO_MC_1(m, __VA_ARGS__,))
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#define MACRO_MC_3(m, a, ...) UTIL_CAT(m(a), MACRO_MC_2(m, __VA_ARGS__,))
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#define MACRO_MC_4(m, a, ...) UTIL_CAT(m(a), MACRO_MC_3(m, __VA_ARGS__,))
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#define MACRO_MC_5(m, a, ...) UTIL_CAT(m(a), MACRO_MC_4(m, __VA_ARGS__,))
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#define MACRO_MC_6(m, a, ...) UTIL_CAT(m(a), MACRO_MC_5(m, __VA_ARGS__,))
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#define MACRO_MC_7(m, a, ...) UTIL_CAT(m(a), MACRO_MC_6(m, __VA_ARGS__,))
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#define MACRO_MC_8(m, a, ...) UTIL_CAT(m(a), MACRO_MC_7(m, __VA_ARGS__,))
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#define MACRO_MC_9(m, a, ...) UTIL_CAT(m(a), MACRO_MC_8(m, __VA_ARGS__,))
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#define MACRO_MC_10(m, a, ...) UTIL_CAT(m(a), MACRO_MC_9(m, __VA_ARGS__,))
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#define MACRO_MC_11(m, a, ...) UTIL_CAT(m(a), MACRO_MC_10(m, __VA_ARGS__,))
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#define MACRO_MC_12(m, a, ...) UTIL_CAT(m(a), MACRO_MC_11(m, __VA_ARGS__,))
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#define MACRO_MC_13(m, a, ...) UTIL_CAT(m(a), MACRO_MC_12(m, __VA_ARGS__,))
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#define MACRO_MC_14(m, a, ...) UTIL_CAT(m(a), MACRO_MC_13(m, __VA_ARGS__,))
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#define MACRO_MC_15(m, a, ...) UTIL_CAT(m(a), MACRO_MC_14(m, __VA_ARGS__,))
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#endif /* ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_ */
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