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