1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 39 /* 40 * Unlike other ANSI header files, <assert.h> may usefully be included 41 * multiple times, with and without NDEBUG defined. 42 */ 43 44 #undef assert 45 #undef _assert 46 #undef __assert_unreachable 47 48 #ifdef NDEBUG 49 #define assert(e) ((void)0) 50 #define _assert(e) ((void)0) 51 #if __BSD_VISIBLE 52 #define __assert_unreachable() __unreachable() 53 #endif /* __BSD_VISIBLE */ 54 #else 55 #ifdef __cplusplus 56 #if __cplusplus < 202002L 57 /* 58 * C++ modes prior to C++20 cannot simultaneously satisfy all three 59 * desirable properties of the sanitiser: 60 * 61 * Approach No double-eval Lambda support Arity check 62 * ----------------------------- -------------- -------------- ----------- 63 * sizeof(cast(expression)) yes no yes 64 * static_cast<bool>(expression) no yes no 65 * (void)bool(expression) no yes no 66 * 67 * NOTE: C++20 introduced lambdas in unevaluated contexts; see P0315R4. 68 * 69 * Since no approach satisfies all three below C++20, the least harmful 70 * choice is to forgo the check entirely rather than silently break one 71 * of the remaining guarantees. 72 * 73 */ 74 #define __assert_sanitize(...) ((void)0) 75 #else 76 #define __assert_sanitize(...) (void)sizeof(((bool(*)(bool))0)(__VA_ARGS__)) 77 #endif /* __cplusplus < 202002L */ 78 #else 79 #define __assert_sanitize(...) (void)sizeof(((_Bool(*)(_Bool))0)(__VA_ARGS__)) 80 #endif /* __cplusplus */ 81 #define assert(...) (__assert_sanitize(__VA_ARGS__), \ 82 (__VA_ARGS__) ? (void)0 : \ 83 __assert(__func__, __FILE__, \ 84 __LINE__, #__VA_ARGS__)) 85 #define _assert(...) assert(__VA_ARGS__) 86 #if __BSD_VISIBLE 87 #define __assert_unreachable() assert(0 && "unreachable segment reached") 88 #endif /* __BSD_VISIBLE */ 89 #endif /* NDEBUG */ 90 91 #ifndef __STDC_VERSION_ASSERT_H__ 92 #define __STDC_VERSION_ASSERT_H__ 202311L 93 94 /* 95 * Static assertions. In principle we could define static_assert for 96 * C++ older than C++11, but this breaks if _Static_assert is 97 * implemented as a macro. 98 * 99 * C++ template parameters may contain commas, even if not enclosed in 100 * parentheses, causing the _Static_assert macro to be invoked with more 101 * than two parameters. 102 * 103 * C23 defines static_assert and its obsolescent alternative spelling, 104 * _Static_assert, as keywords. 105 */ 106 #if __ISO_C_VISIBLE >= 2011 && !defined(__cplusplus) && \ 107 __STDC_VERSION__ < 202311L 108 #define static_assert _Static_assert 109 #endif 110 111 __BEGIN_DECLS 112 void __assert(const char *, const char *, int, const char *) __dead2; 113 __END_DECLS 114 115 #endif /* !__STDC_VERSION_ASSERT_H__ */ 116