1 /* Internal header file for __libc_supported_implementations. 2 Copyright (C) 2012-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _IFUNC_IMPL_LIST_H 20 #define _IFUNC_IMPL_LIST_H 1 21 22 #include <stdbool.h> 23 #include <stddef.h> 24 25 struct libc_ifunc_impl 26 { 27 /* The name of function to be tested. */ 28 const char *name; 29 /* The address of function to be tested. */ 30 void (*fn) (void); 31 /* True if this implementation is usable on this machine. */ 32 bool usable; 33 }; 34 35 /* Add an IFUNC implementation, IMPL, for function FUNC, to ARRAY with 36 USABLE at index I and advance I by one. */ 37 #define IFUNC_IMPL_ADD(array, max, func, usable, impl) \ 38 extern __typeof (func) impl attribute_hidden; \ 39 if (n < max) (array)[n++] = (struct libc_ifunc_impl) { #impl, (void (*) (void)) impl, (usable) }; 40 41 /* Return the number of IFUNC implementations, N, for function FUNC if 42 string NAME matches FUNC. */ 43 #define IFUNC_IMPL(max, name, func, ...) \ 44 if (strcmp (name, #func) == 0) \ 45 { size_t n = 0;\ 46 __VA_ARGS__; \ 47 return n; \ 48 } 49 50 /* Fill ARRAY of MAX elements with IFUNC implementations for function 51 NAME and return the number of valid entries. */ 52 extern size_t __libc_ifunc_impl_list (const char *name, 53 struct libc_ifunc_impl *array, 54 size_t max); 55 56 #endif /* ifunc-impl-list.h */ 57