1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #ifndef _XE_RTP_HELPERS_ 7 #define _XE_RTP_HELPERS_ 8 9 #ifndef _XE_RTP_INCLUDE_PRIVATE_HELPERS 10 #error "This header is supposed to be included by xe_rtp.h only" 11 #endif 12 13 /* 14 * Helper macros - not to be used outside this header. 15 */ 16 #define _XE_ESC(...) __VA_ARGS__ 17 #define _XE_COUNT_ARGS(...) _XE_ESC(__XE_COUNT_ARGS(__VA_ARGS__, 5, 4, 3, 2, 1,)) 18 #define __XE_COUNT_ARGS(_, _5, _4, _3, _2, X_, ...) X_ 19 20 #define _XE_FIRST(...) _XE_ESC(__XE_FIRST(__VA_ARGS__,)) 21 #define __XE_FIRST(x_, ...) x_ 22 #define _XE_TUPLE_TAIL(...) _XE_ESC(__XE_TUPLE_TAIL(__VA_ARGS__)) 23 #define __XE_TUPLE_TAIL(x_, ...) (__VA_ARGS__) 24 25 #define _XE_DROP_FIRST(x_, ...) __VA_ARGS__ 26 27 #define _XE_RTP_CONCAT(a, b) __XE_RTP_CONCAT(a, b) 28 #define __XE_RTP_CONCAT(a, b) XE_RTP_ ## a ## b 29 30 #define __XE_RTP_PASTE_SEP_COMMA , 31 #define __XE_RTP_PASTE_SEP_BITWISE_OR | 32 33 /* 34 * XE_RTP_PASTE_FOREACH - Paste XE_RTP_<@prefix_> on each element of the tuple 35 * @args, with the end result separated by @sep_. @sep must be one of the 36 * previously declared macros __XE_RTP_PASTE_SEP_*, or declared with such 37 * prefix. 38 * 39 * Examples: 40 * 41 * 1) XE_RTP_PASTE_FOREACH(TEST_, COMMA, (FOO, BAR)) 42 * expands to: 43 * 44 * XE_RTP_TEST_FOO , XE_RTP_TEST_BAR 45 * 46 * 2) XE_RTP_PASTE_FOREACH(TEST2_, COMMA, (FOO)) 47 * expands to: 48 * 49 * XE_RTP_TEST2_FOO 50 * 51 * 3) XE_RTP_PASTE_FOREACH(TEST3, BITWISE_OR, (FOO, BAR)) 52 * expands to: 53 * 54 * XE_RTP_TEST3_FOO | XE_RTP_TEST3_BAR 55 * 56 * 4) #define __XE_RTP_PASTE_SEP_MY_SEP BANANA 57 * XE_RTP_PASTE_FOREACH(TEST_, MY_SEP, (FOO, BAR)) 58 * expands to: 59 * 60 * XE_RTP_TEST_FOO BANANA XE_RTP_TEST_BAR 61 */ 62 #define XE_RTP_PASTE_FOREACH(prefix_, sep_, args_) _XE_ESC(_XE_RTP_CONCAT(PASTE_, _XE_COUNT_ARGS args_)(prefix_, sep_, args_)) 63 #define XE_RTP_PASTE_1(prefix_, sep_, args_) _XE_RTP_CONCAT(prefix_, _XE_FIRST args_) 64 #define XE_RTP_PASTE_2(prefix_, sep_, args_) _XE_RTP_CONCAT(prefix_, _XE_FIRST args_) __XE_RTP_PASTE_SEP_ ## sep_ XE_RTP_PASTE_1(prefix_, sep_, _XE_TUPLE_TAIL args_) 65 #define XE_RTP_PASTE_3(prefix_, sep_, args_) _XE_RTP_CONCAT(prefix_, _XE_FIRST args_) __XE_RTP_PASTE_SEP_ ## sep_ XE_RTP_PASTE_2(prefix_, sep_, _XE_TUPLE_TAIL args_) 66 #define XE_RTP_PASTE_4(prefix_, sep_, args_) _XE_RTP_CONCAT(prefix_, _XE_FIRST args_) __XE_RTP_PASTE_SEP_ ## sep_ XE_RTP_PASTE_3(prefix_, sep_, _XE_TUPLE_TAIL args_) 67 68 /* 69 * XE_RTP_DROP_CAST - Drop cast to convert a compound statement to a initializer 70 * 71 * Example: 72 * 73 * #define foo(a_) ((struct foo){ .a = a_ }) 74 * XE_RTP_DROP_CAST(foo(10)) 75 * expands to: 76 * 77 * { .a = 10 } 78 */ 79 #define XE_RTP_DROP_CAST(...) _XE_ESC(_XE_DROP_FIRST _XE_ESC __VA_ARGS__) 80 81 #endif 82