// Copyright 2021 The Dawn & Tint Authors // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are met: // // 1. Redistributions of source code must retain the above copyright notice, this // list of conditions and the following disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright notice, // this list of conditions and the following disclaimer in the documentation // and/or other materials provided with the distribution. // // 3. Neither the name of the copyright holder nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #ifndef SRC_DAWN_COMMON_PREPROCESSOR_H_ #define SRC_DAWN_COMMON_PREPROCESSOR_H_ // DAWN_PP_GET_HEAD: get the first element of a __VA_ARGS__ without triggering empty // __VA_ARGS__ warnings. #define DAWN_INTERNAL_PP_GET_HEAD(firstParam, ...) … #define DAWN_PP_GET_HEAD(...) … // DAWN_PP_CONCATENATE: Concatenate tokens, first expanding the arguments passed in. #define DAWN_PP_CONCATENATE(arg1, arg2) … #define DAWN_PP_CONCATENATE_1(arg1, arg2) … #define DAWN_PP_CONCATENATE_2(arg1, arg2) … // DAWN_PP_EXPAND: Needed to help expand __VA_ARGS__ out on MSVC #define DAWN_PP_EXPAND(...) … // Implementation of DAWN_PP_FOR_EACH, called by concatenating DAWN_PP_FOR_EACH_ with a number. #define DAWN_PP_FOR_EACH_1(func, x) … #define DAWN_PP_FOR_EACH_2(func, x, ...) … #define DAWN_PP_FOR_EACH_3(func, x, ...) … #define DAWN_PP_FOR_EACH_4(func, x, ...) … #define DAWN_PP_FOR_EACH_5(func, x, ...) … #define DAWN_PP_FOR_EACH_6(func, x, ...) … #define DAWN_PP_FOR_EACH_7(func, x, ...) … #define DAWN_PP_FOR_EACH_8(func, x, ...) … // Implementation for DAWN_PP_FOR_EACH. Get the number of args in __VA_ARGS__ so we can concat // DAWN_PP_FOR_EACH_ and N. // ex.) DAWN_PP_FOR_EACH_NARG(a, b, c) -> // DAWN_PP_FOR_EACH_NARG(a, b, c, DAWN_PP_FOR_EACH_RSEQ()) -> // DAWN_PP_FOR_EACH_NARG_(a, b, c, 8, 7, 6, 5, 4, 3, 2, 1, 0) -> // DAWN_PP_FOR_EACH_ARG_N(a, b, c, 8, 7, 6, 5, 4, 3, 2, 1, 0) -> // DAWN_PP_FOR_EACH_ARG_N( , , , , , , , , N) -> // 3 #define DAWN_PP_FOR_EACH_NARG(...) … #define DAWN_PP_FOR_EACH_NARG_(...) … #define DAWN_PP_FOR_EACH_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, N, ...) … #define DAWN_PP_FOR_EACH_RSEQ() … // Implementation for DAWN_PP_FOR_EACH. // Creates a call to DAWN_PP_FOR_EACH_X where X is 1, 2, ..., etc. #define DAWN_PP_FOR_EACH_(N, func, ...) … // DAWN_PP_FOR_EACH: Apply |func| to each argument in |x| and __VA_ARGS__ #define DAWN_PP_FOR_EACH(func, ...) … #endif // SRC_DAWN_COMMON_PREPROCESSOR_H_
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