1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ 2 /* 3 * Copyright (c) 1993, 1994, 1995, 1996, 1997 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the Computer Systems 17 * Engineering Group at Lawrence Berkeley Laboratory. 18 * 4. Neither the name of the University nor of the Laboratory may be used 19 * to endorse or promote products derived from this software without 20 * specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lib_funcattrs_h 36 #define lib_funcattrs_h 37 38 /* 39 * Attributes to apply to functions and their arguments, using various 40 * compiler-specific extensions. 41 */ 42 43 /* 44 * This was introduced by Clang: 45 * 46 * http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute 47 * 48 * in some version (which version?); it has been picked up by GCC 5.0. 49 */ 50 #ifndef __has_attribute 51 /* 52 * It's a macro, so you can check whether it's defined to check 53 * whether it's supported. 54 * 55 * If it's not, define it to always return 0, so that we move on to 56 * the fallback checks. 57 */ 58 #define __has_attribute(x) 0 59 #endif 60 61 /* 62 * NORETURN, before a function declaration, means "this function 63 * never returns". (It must go before the function declaration, e.g. 64 * "extern NORETURN func(...)" rather than after the function 65 * declaration, as the MSVC version has to go before the declaration.) 66 */ 67 #if __has_attribute(noreturn) \ 68 || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \ 69 || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \ 70 || (defined(__xlC__) && __xlC__ >= 0x0A01) \ 71 || (defined(__HP_aCC) && __HP_aCC >= 61000) 72 /* 73 * Compiler with support for __attribute((noreturn)), or GCC 2.5 and 74 * later, or Solaris Studio 12 (Sun C 5.9) and later, or IBM XL C 10.1 75 * and later (do any earlier versions of XL C support this?), or 76 * HP aCC A.06.10 and later. 77 */ 78 #define NORETURN __attribute((noreturn)) 79 #elif defined(_MSC_VER) 80 /* 81 * MSVC. 82 */ 83 #define NORETURN __declspec(noreturn) 84 #else 85 #define NORETURN 86 #endif 87 88 /* 89 * PRINTFLIKE(x,y), after a function declaration, means "this function 90 * does printf-style formatting, with the xth argument being the format 91 * string and the yth argument being the first argument for the format 92 * string". 93 */ 94 #if __has_attribute(__format__) \ 95 || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \ 96 || (defined(__xlC__) && __xlC__ >= 0x0A01) \ 97 || (defined(__HP_aCC) && __HP_aCC >= 61000) 98 /* 99 * Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1 100 * and later (do any earlier versions of XL C support this?), 101 * or HP aCC A.06.10 and later. 102 */ 103 #define PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y))) 104 #else 105 #define PRINTFLIKE(x,y) 106 #endif 107 108 /* 109 * For flagging arguments as format strings in MSVC. 110 */ 111 #if _MSC_VER >= 1400 112 #include <sal.h> 113 #if _MSC_VER > 1400 114 #define FORMAT_STRING(p) _Printf_format_string_ p 115 #else 116 #define FORMAT_STRING(p) __format_string p 117 #endif 118 #else 119 #define FORMAT_STRING(p) p 120 #endif 121 122 #endif /* lib_funcattrs_h */ 123