Zephyr API Documentation  3.7.0-rc1
A Scalable Open Source RTOS
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util_internal.h
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1/*
2 * Copyright (c) 2011-2014, Wind River Systems, Inc.
3 * Copyright (c) 2020, Nordic Semiconductor ASA
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7
15#ifndef ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_
16#define ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_
17
18#include "util_loops.h"
19
20/* IS_ENABLED() helpers */
21
22/* This is called from IS_ENABLED(), and sticks on a "_XXXX" prefix,
23 * it will now be "_XXXX1" if config_macro is "1", or just "_XXXX" if it's
24 * undefined.
25 * ENABLED: Z_IS_ENABLED2(_XXXX1)
26 * DISABLED Z_IS_ENABLED2(_XXXX)
27 */
28#define Z_IS_ENABLED1(config_macro) Z_IS_ENABLED2(_XXXX##config_macro)
29
30/* Here's the core trick, we map "_XXXX1" to "_YYYY," (i.e. a string
31 * with a trailing comma), so it has the effect of making this a
32 * two-argument tuple to the preprocessor only in the case where the
33 * value is defined to "1"
34 * ENABLED: _YYYY, <--- note comma!
35 * DISABLED: _XXXX
36 */
37#define _XXXX1 _YYYY,
38
39/* Then we append an extra argument to fool the gcc preprocessor into
40 * accepting it as a varargs macro.
41 * arg1 arg2 arg3
42 * ENABLED: Z_IS_ENABLED3(_YYYY, 1, 0)
43 * DISABLED Z_IS_ENABLED3(_XXXX 1, 0)
44 */
45#define Z_IS_ENABLED2(one_or_two_args) Z_IS_ENABLED3(one_or_two_args 1, 0)
46
47/* And our second argument is thus now cooked to be 1 in the case
48 * where the value is defined to 1, and 0 if not:
49 */
50#define Z_IS_ENABLED3(ignore_this, val, ...) val
51
52/* Implementation of IS_EQ(). Returns 1 if _0 and _1 are the same integer from
53 * 0 to 4095, 0 otherwise.
54 */
55#define Z_IS_EQ(_0, _1) Z_HAS_COMMA(Z_CAT4(Z_IS_, _0, _EQ_, _1)())
56
57/* Used internally by COND_CODE_1 and COND_CODE_0. */
58#define Z_COND_CODE_1(_flag, _if_1_code, _else_code) \
59 __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
60#define Z_COND_CODE_0(_flag, _if_0_code, _else_code) \
61 __COND_CODE(_ZZZZ##_flag, _if_0_code, _else_code)
62#define _ZZZZ0 _YYYY,
63#define __COND_CODE(one_or_two_args, _if_code, _else_code) \
64 __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
65
66/* Gets second argument and removes brackets around that argument. It
67 * is expected that the parameter is provided in brackets/parentheses.
68 */
69#define __GET_ARG2_DEBRACKET(ignore_this, val, ...) __DEBRACKET val
70
71/* Used to remove brackets from around a single argument. */
72#define __DEBRACKET(...) __VA_ARGS__
73
74/* Used by IS_EMPTY() */
75/* reference: https://gustedt.wordpress.com/2010/06/08/detect-empty-macro-arguments/ */
76#define Z_HAS_COMMA(...) \
77 NUM_VA_ARGS_LESS_1_IMPL(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, \
78 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
79 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
80 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0)
81#define Z_TRIGGER_PARENTHESIS_(...) ,
82#define Z_IS_EMPTY_(...) \
83 Z_IS_EMPTY__( \
84 Z_HAS_COMMA(__VA_ARGS__), \
85 Z_HAS_COMMA(Z_TRIGGER_PARENTHESIS_ __VA_ARGS__), \
86 Z_HAS_COMMA(__VA_ARGS__ (/*empty*/)), \
87 Z_HAS_COMMA(Z_TRIGGER_PARENTHESIS_ __VA_ARGS__ (/*empty*/)))
88#define Z_CAT4(_0, _1, _2, _3) _0 ## _1 ## _2 ## _3
89#define Z_CAT5(_0, _1, _2, _3, _4) _0 ## _1 ## _2 ## _3 ## _4
90#define Z_IS_EMPTY__(_0, _1, _2, _3) \
91 Z_HAS_COMMA(Z_CAT5(Z_IS_EMPTY_CASE_, _0, _1, _2, _3))
92#define Z_IS_EMPTY_CASE_0001 ,
93
94/* Used by LIST_DROP_EMPTY() */
95/* Adding ',' after each element would add empty element at the end of
96 * list, which is hard to remove, so instead precede each element with ',',
97 * this way first element is empty, and this one is easy to drop.
98 */
99#define Z_LIST_ADD_ELEM(e) EMPTY, e
100#define Z_LIST_DROP_FIRST(...) GET_ARGS_LESS_N(1, __VA_ARGS__)
101#define Z_LIST_NO_EMPTIES(e) \
102 COND_CODE_1(IS_EMPTY(e), (), (Z_LIST_ADD_ELEM(e)))
103
104#define UTIL_CAT(a, ...) UTIL_PRIMITIVE_CAT(a, __VA_ARGS__)
105#define UTIL_PRIMITIVE_CAT(a, ...) a##__VA_ARGS__
106#define UTIL_CHECK_N(x, n, ...) n
107#define UTIL_CHECK(...) UTIL_CHECK_N(__VA_ARGS__, 0,)
108#define UTIL_NOT(x) UTIL_CHECK(UTIL_PRIMITIVE_CAT(UTIL_NOT_, x))
109#define UTIL_NOT_0 ~, 1,
110#define UTIL_COMPL(b) UTIL_PRIMITIVE_CAT(UTIL_COMPL_, b)
111#define UTIL_COMPL_0 1
112#define UTIL_COMPL_1 0
113#define UTIL_BOOL(x) UTIL_COMPL(UTIL_NOT(x))
114
115#define UTIL_EVAL(...) __VA_ARGS__
116#define UTIL_EXPAND(...) __VA_ARGS__
117#define UTIL_REPEAT(...) UTIL_LISTIFY(__VA_ARGS__)
118
119#define _CONCAT_0(arg, ...) arg
120#define _CONCAT_1(arg, ...) UTIL_CAT(arg, _CONCAT_0(__VA_ARGS__))
121#define _CONCAT_2(arg, ...) UTIL_CAT(arg, _CONCAT_1(__VA_ARGS__))
122#define _CONCAT_3(arg, ...) UTIL_CAT(arg, _CONCAT_2(__VA_ARGS__))
123#define _CONCAT_4(arg, ...) UTIL_CAT(arg, _CONCAT_3(__VA_ARGS__))
124#define _CONCAT_5(arg, ...) UTIL_CAT(arg, _CONCAT_4(__VA_ARGS__))
125#define _CONCAT_6(arg, ...) UTIL_CAT(arg, _CONCAT_5(__VA_ARGS__))
126#define _CONCAT_7(arg, ...) UTIL_CAT(arg, _CONCAT_6(__VA_ARGS__))
127
128/* Implementation details for NUM_VA_ARGS_LESS_1 */
129#define NUM_VA_ARGS_LESS_1_IMPL( \
130 _ignored, \
131 _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, \
132 _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, \
133 _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, \
134 _31, _32, _33, _34, _35, _36, _37, _38, _39, _40, \
135 _41, _42, _43, _44, _45, _46, _47, _48, _49, _50, \
136 _51, _52, _53, _54, _55, _56, _57, _58, _59, _60, \
137 _61, _62, N, ...) N
138
139/* Used by MACRO_MAP_CAT */
140#define MACRO_MAP_CAT_(...) \
141 /* To make sure it works also for 2 arguments in total */ \
142 MACRO_MAP_CAT_N(NUM_VA_ARGS_LESS_1(__VA_ARGS__), __VA_ARGS__)
143#define MACRO_MAP_CAT_N_(N, ...) UTIL_CAT(MACRO_MC_, N)(__VA_ARGS__,)
144#define MACRO_MC_0(...)
145#define MACRO_MC_1(m, a, ...) m(a)
146#define MACRO_MC_2(m, a, ...) UTIL_CAT(m(a), MACRO_MC_1(m, __VA_ARGS__,))
147#define MACRO_MC_3(m, a, ...) UTIL_CAT(m(a), MACRO_MC_2(m, __VA_ARGS__,))
148#define MACRO_MC_4(m, a, ...) UTIL_CAT(m(a), MACRO_MC_3(m, __VA_ARGS__,))
149#define MACRO_MC_5(m, a, ...) UTIL_CAT(m(a), MACRO_MC_4(m, __VA_ARGS__,))
150#define MACRO_MC_6(m, a, ...) UTIL_CAT(m(a), MACRO_MC_5(m, __VA_ARGS__,))
151#define MACRO_MC_7(m, a, ...) UTIL_CAT(m(a), MACRO_MC_6(m, __VA_ARGS__,))
152#define MACRO_MC_8(m, a, ...) UTIL_CAT(m(a), MACRO_MC_7(m, __VA_ARGS__,))
153#define MACRO_MC_9(m, a, ...) UTIL_CAT(m(a), MACRO_MC_8(m, __VA_ARGS__,))
154#define MACRO_MC_10(m, a, ...) UTIL_CAT(m(a), MACRO_MC_9(m, __VA_ARGS__,))
155#define MACRO_MC_11(m, a, ...) UTIL_CAT(m(a), MACRO_MC_10(m, __VA_ARGS__,))
156#define MACRO_MC_12(m, a, ...) UTIL_CAT(m(a), MACRO_MC_11(m, __VA_ARGS__,))
157#define MACRO_MC_13(m, a, ...) UTIL_CAT(m(a), MACRO_MC_12(m, __VA_ARGS__,))
158#define MACRO_MC_14(m, a, ...) UTIL_CAT(m(a), MACRO_MC_13(m, __VA_ARGS__,))
159#define MACRO_MC_15(m, a, ...) UTIL_CAT(m(a), MACRO_MC_14(m, __VA_ARGS__,))
160
161/* Used by Z_IS_EQ */
162#include "util_internal_is_eq.h"
163
164/*
165 * Generic sparse list of odd numbers (check the implementation of
166 * GPIO_DT_RESERVED_RANGES_NGPIOS as a usage example)
167 */
168#define Z_SPARSE_LIST_ODD_NUMBERS \
169 EMPTY, 1, EMPTY, 3, EMPTY, 5, EMPTY, 7, \
170 EMPTY, 9, EMPTY, 11, EMPTY, 13, EMPTY, 15, \
171 EMPTY, 17, EMPTY, 19, EMPTY, 21, EMPTY, 23, \
172 EMPTY, 25, EMPTY, 27, EMPTY, 29, EMPTY, 31, \
173 EMPTY, 33, EMPTY, 35, EMPTY, 37, EMPTY, 39, \
174 EMPTY, 41, EMPTY, 43, EMPTY, 45, EMPTY, 47, \
175 EMPTY, 49, EMPTY, 51, EMPTY, 53, EMPTY, 55, \
176 EMPTY, 57, EMPTY, 59, EMPTY, 61, EMPTY, 63
177
178/*
179 * Generic sparse list of even numbers (check the implementation of
180 * GPIO_DT_RESERVED_RANGES_NGPIOS as a usage example)
181 */
182#define Z_SPARSE_LIST_EVEN_NUMBERS \
183 0, EMPTY, 2, EMPTY, 4, EMPTY, 6, EMPTY, \
184 8, EMPTY, 10, EMPTY, 12, EMPTY, 14, EMPTY, \
185 16, EMPTY, 18, EMPTY, 20, EMPTY, 22, EMPTY, \
186 24, EMPTY, 26, EMPTY, 28, EMPTY, 30, EMPTY, \
187 32, EMPTY, 34, EMPTY, 36, EMPTY, 38, EMPTY, \
188 40, EMPTY, 42, EMPTY, 44, EMPTY, 46, EMPTY, \
189 48, EMPTY, 50, EMPTY, 52, EMPTY, 54, EMPTY, \
190 56, EMPTY, 58, EMPTY, 60, EMPTY, 62, EMPTY
191
192/* Used by UTIL_INC */
194
195/* Used by UTIL_DEC */
197
198/* Used by UTIL_X2 */
200
201#endif /* ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_ */
Internals for looping macros.