mirror of
https://github.com/espressif/esp-idf.git
synced 2025-10-30 20:51:41 +00:00
64e0fc7a5a
__VA_NARG__ is copied from a forum post and is a pretty common implementation with a high chance of causing naming collision Added ESP_ namespace to avoid this.
93 lines
3.7 KiB
C++
93 lines
3.7 KiB
C++
/*
|
|
* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
/*
|
|
This header contains various general purpose helper macros used across ESP-IDF
|
|
*/
|
|
#include <assert.h>
|
|
#include "esp_assert.h"
|
|
#include "esp_compiler.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @brief Macro to select different versions of other macros based on whether VA_ARGS has an argument or no argument
|
|
*
|
|
* Some macros (such as in FreeRTOS) have two versions (one that accepts arguments and another that does not). The
|
|
* following "CHOOSE_MACRO_VA_ARG" selector allows automatic selection between two different versions of a macro.
|
|
*
|
|
* "CHOOSE_MACRO_VA_ARG" make use of the fact that "##__VA_ARGS__," will eliminate the trailing comma if there are no
|
|
* arguments, thus allows subsequent arguments in "CHOOSE_MACRO_VA_ARG" to be left shifted in the parameter list.
|
|
*
|
|
* Therefore, if we call the following:
|
|
* - CHOOSE_MACRO_VA_ARG(MACRO_ARGS, MACRO_NO_ARGS, ##__VA_ARGS__)(__VA_ARGS__)
|
|
*
|
|
* The result will be:
|
|
* - MACRO_ARGS(__VA_ARGS__) if __VA_ARGS__ was not empty
|
|
* - MACRO_NO_ARGS() if __VA_ARGS__ was empty
|
|
*
|
|
* @note In the future, we want to become compatible with clang. Hence, we provide two
|
|
* versions of the following macros which are using variadic arguments. One is using the GNU extension ##__VA_ARGS__.
|
|
* The other is using the C++20 feature __VA_OPT__(,). This allows users to compile their code with standard C++20
|
|
* enabled instead of the GNU extension. Below C++20, we haven't found any good alternative to using ##__VA_ARGS__.
|
|
*/
|
|
#if defined(__cplusplus) && (__cplusplus > 201703L)
|
|
#define CHOOSE_MACRO_VA_ARG_INN_IMPL(...) __VA_OPT__(0)
|
|
#define CHOOSE_MACRO_VA_ARG_INN(one, MACRO1, MACRO2, ...) MACRO1
|
|
#define CHOOSE_MACRO_VA_ARG(MACRO_WITH_ARGS, MACRO_WITH_NO_ARGS, ...) CHOOSE_MACRO_VA_ARG_INN(CHOOSE_MACRO_VA_ARG_INN_IMPL(__VA_ARGS__) __VA_OPT__(,) MACRO_WITH_ARGS, MACRO_WITH_NO_ARGS, 0)
|
|
#else
|
|
#define CHOOSE_MACRO_VA_ARG_INN(one, two, MACRO1, MACRO2, ...) MACRO1
|
|
#define CHOOSE_MACRO_VA_ARG(MACRO_WITH_ARGS, MACRO_WITH_NO_ARGS, ...) CHOOSE_MACRO_VA_ARG_INN(0, ##__VA_ARGS__, MACRO_WITH_ARGS, MACRO_WITH_NO_ARGS, 0)
|
|
#endif
|
|
|
|
/* Count number of arguments of __VA_ARGS__
|
|
* - reference https://groups.google.com/forum/#!topic/comp.std.c/d-6Mj5Lko_s
|
|
* - __GET_NTH_ARG__() takes args >= N (64) but only expand to Nth one (64th)
|
|
* - ESP_RSEQ_N() is reverse sequential to N to add padding to have Nth
|
|
* position is the same as the number of arguments
|
|
* - ##__VA_ARGS__ is used to deal with 0 parameter (swallows comma)
|
|
*/
|
|
#ifndef ESP_VA_NARG
|
|
# define ESP_VA_NARG(...) ESP_NARG(_0, ##__VA_ARGS__, ESP_RSEQ_N())
|
|
|
|
# define ESP_NARG(...) ESP_GET_NTH_ARG(__VA_ARGS__)
|
|
# define ESP_GET_NTH_ARG( \
|
|
_01,_02,_03,_04,_05,_06,_07,_08,_09,_10, \
|
|
_11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
|
|
_21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
|
|
_31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
|
|
_41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
|
|
_51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
|
|
_61,_62,_63,N,...) N
|
|
# define ESP_RSEQ_N() \
|
|
62,61,60, \
|
|
59,58,57,56,55,54,53,52,51,50, \
|
|
49,48,47,46,45,44,43,42,41,40, \
|
|
39,38,37,36,35,34,33,32,31,30, \
|
|
29,28,27,26,25,24,23,22,21,20, \
|
|
19,18,17,16,15,14,13,12,11,10, \
|
|
9, 8, 7, 6, 5, 4, 3, 2, 1, 0
|
|
#endif
|
|
|
|
#ifndef ESP_UNUSED
|
|
#define ESP_UNUSED(x) ((void)(x))
|
|
#endif
|
|
|
|
#define ESP_INFINITE_LOOP() \
|
|
do { \
|
|
ESP_COMPILER_DIAGNOSTIC_PUSH_IGNORE("-Wanalyzer-infinite-loop") \
|
|
while(1); \
|
|
ESP_COMPILER_DIAGNOSTIC_POP("-Wanalyzer-infinite-loop") \
|
|
} while(1)
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|