82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2023 Intel Corporation
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*/
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#ifndef _XE_RTP_HELPERS_
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#define _XE_RTP_HELPERS_
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#ifndef _XE_RTP_INCLUDE_PRIVATE_HELPERS
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#error "This header is supposed to be included by xe_rtp.h only"
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#endif
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/*
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* Helper macros - not to be used outside this header.
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*/
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#define _XE_ESC(...) __VA_ARGS__
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#define _XE_COUNT_ARGS(...) _XE_ESC(__XE_COUNT_ARGS(__VA_ARGS__, 5, 4, 3, 2, 1,))
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#define __XE_COUNT_ARGS(_, _5, _4, _3, _2, X_, ...) X_
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#define _XE_FIRST(...) _XE_ESC(__XE_FIRST(__VA_ARGS__,))
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#define __XE_FIRST(x_, ...) x_
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#define _XE_TUPLE_TAIL(...) _XE_ESC(__XE_TUPLE_TAIL(__VA_ARGS__))
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#define __XE_TUPLE_TAIL(x_, ...) (__VA_ARGS__)
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#define _XE_DROP_FIRST(x_, ...) __VA_ARGS__
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#define _XE_RTP_CONCAT(a, b) __XE_RTP_CONCAT(a, b)
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#define __XE_RTP_CONCAT(a, b) XE_RTP_ ## a ## b
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#define __XE_RTP_PASTE_SEP_COMMA ,
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#define __XE_RTP_PASTE_SEP_BITWISE_OR |
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/*
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* XE_RTP_PASTE_FOREACH - Paste XE_RTP_<@prefix_> on each element of the tuple
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* @args, with the end result separated by @sep_. @sep must be one of the
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* previously declared macros __XE_RTP_PASTE_SEP_*, or declared with such
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* prefix.
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*
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* Examples:
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*
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* 1) XE_RTP_PASTE_FOREACH(TEST_, COMMA, (FOO, BAR))
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* expands to:
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*
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* XE_RTP_TEST_FOO , XE_RTP_TEST_BAR
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*
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* 2) XE_RTP_PASTE_FOREACH(TEST2_, COMMA, (FOO))
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* expands to:
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*
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* XE_RTP_TEST2_FOO
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*
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* 3) XE_RTP_PASTE_FOREACH(TEST3, BITWISE_OR, (FOO, BAR))
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* expands to:
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*
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* XE_RTP_TEST3_FOO | XE_RTP_TEST3_BAR
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*
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* 4) #define __XE_RTP_PASTE_SEP_MY_SEP BANANA
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* XE_RTP_PASTE_FOREACH(TEST_, MY_SEP, (FOO, BAR))
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* expands to:
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*
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* XE_RTP_TEST_FOO BANANA XE_RTP_TEST_BAR
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*/
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#define XE_RTP_PASTE_FOREACH(prefix_, sep_, args_) _XE_ESC(_XE_RTP_CONCAT(PASTE_, _XE_COUNT_ARGS args_)(prefix_, sep_, args_))
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#define XE_RTP_PASTE_1(prefix_, sep_, args_) _XE_RTP_CONCAT(prefix_, _XE_FIRST args_)
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#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_)
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#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_)
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#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_)
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/*
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* XE_RTP_DROP_CAST - Drop cast to convert a compound statement to a initializer
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*
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* Example:
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*
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* #define foo(a_) ((struct foo){ .a = a_ })
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* XE_RTP_DROP_CAST(foo(10))
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* expands to:
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*
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* { .a = 10 }
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*/
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#define XE_RTP_DROP_CAST(...) _XE_ESC(_XE_DROP_FIRST _XE_ESC __VA_ARGS__)
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#endif
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