1/* Internal header file for __libc_supported_implementations.
2 Copyright (C) 2012-2021 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
25struct 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, i, func, usable, impl) \
38 extern __typeof (func) impl attribute_hidden; \
39 (array)[i++] = (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(n, name, func, ...) \
44 if (strcmp (name, #func) == 0) \
45 { \
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. */
52extern 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