| /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ |
| /* |
| * Copyright (c) 1993, 1994, 1995, 1996, 1997 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * 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. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by the Computer Systems |
| * Engineering Group at Lawrence Berkeley Laboratory. |
| * 4. Neither the name of the University nor of the Laboratory may be used |
| * to endorse or promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 lib_funcattrs_h |
| #define lib_funcattrs_h |
| |
| #include "compiler-tests.h" |
| |
| /* |
| * Attributes to apply to functions and their arguments, using various |
| * compiler-specific extensions. |
| */ |
| |
| /* |
| * NORETURN, before a function declaration, means "this function |
| * never returns". (It must go before the function declaration, e.g. |
| * "extern NORETURN func(...)" rather than after the function |
| * declaration, as the MSVC version has to go before the declaration.) |
| */ |
| #if __has_attribute(noreturn) \ |
| || ND_IS_AT_LEAST_GNUC_VERSION(2,5) \ |
| || ND_IS_AT_LEAST_SUNC_VERSION(5,9) \ |
| || ND_IS_AT_LEAST_XL_C_VERSION(10,1) \ |
| || ND_IS_AT_LEAST_HP_C_VERSION(6,10) |
| /* |
| * Compiler with support for __attribute((noreturn)), or GCC 2.5 and |
| * later, or some compiler asserting compatibility with GCC 2.5 and |
| * later, or Solaris Studio 12 (Sun C 5.9) and later, or IBM XL C 10.1 |
| * and later (do any earlier versions of XL C support this?), or HP aCC |
| * A.06.10 and later. |
| */ |
| #define NORETURN __attribute((noreturn)) |
| |
| /* |
| * However, GCC didn't support that for function *pointers* until GCC |
| * 4.1.0; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3481. |
| * |
| * Sun C/Oracle Studio C doesn't seem to support it, either. |
| */ |
| #if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) < 401)) \ |
| || (defined(__SUNPRO_C)) |
| #define NORETURN_FUNCPTR |
| #else |
| #define NORETURN_FUNCPTR __attribute((noreturn)) |
| #endif |
| #elif defined(_MSC_VER) |
| /* |
| * MSVC. |
| * It doesn't allow __declspec(noreturn) to be applied to function |
| * pointers. |
| */ |
| #define NORETURN __declspec(noreturn) |
| #define NORETURN_FUNCPTR |
| #else |
| #define NORETURN |
| #define NORETURN_FUNCPTR |
| #endif |
| |
| /* |
| * WARN_UNUSED_RESULT, before a function declaration, means "the caller |
| * should use the result of this function" (even if it's just a success/ |
| * failure indication). |
| */ |
| #if __has_attribute(warn_unused_result) \ |
| || ND_IS_AT_LEAST_GNUC_VERSION(3,4) \ |
| || ND_IS_AT_LEAST_HP_C_VERSION(6,25) |
| #define WARN_UNUSED_RESULT __attribute((warn_unused_result)) |
| #else |
| #define WARN_UNUSED_RESULT |
| #endif |
| |
| /* |
| * PRINTFLIKE(x,y), after a function declaration, means "this function |
| * does printf-style formatting, with the xth argument being the format |
| * string and the yth argument being the first argument for the format |
| * string". |
| */ |
| #if __has_attribute(__format__) \ |
| || ND_IS_AT_LEAST_GNUC_VERSION(2,3) \ |
| || ND_IS_AT_LEAST_XL_C_VERSION(10,1) \ |
| || ND_IS_AT_LEAST_HP_C_VERSION(6,10) |
| /* |
| * Compiler with support for it, or GCC 2.3 and later, or some compiler |
| * asserting compatibility with GCC 2.3 and later, or IBM XL C 10.1 |
| * and later (do any earlier versions of XL C support this?), |
| * or HP aCC A.06.10 and later. |
| */ |
| #define PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y))) |
| |
| /* |
| * However, GCC didn't support that for function *pointers* until GCC |
| * 4.1.0; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3481. |
| * XL C 16.1 (and possibly some earlier versions, but not 12.1 or 13.1) has |
| * a similar bug, the bugfix for which was made in: |
| * * version 16.1.1.8 for Linux (25 June 2020), which fixes |
| * https://www.ibm.com/support/pages/apar/LI81402 |
| * * version 16.1.0.5 for AIX (5 May 2020), which fixes |
| * https://www.ibm.com/support/pages/apar/IJ24678 |
| * |
| * When testing versions, keep in mind that XL C 16.1 pretends to be both |
| * GCC 4.2 and Clang 4.0 at once. |
| */ |
| #if (ND_IS_AT_LEAST_GNUC_VERSION(4,1) \ |
| && !ND_IS_AT_LEAST_XL_C_VERSION(10,1)) \ |
| || (ND_IS_AT_LEAST_XL_C_VERSION(16,1) \ |
| && (ND_IS_AT_LEAST_XL_C_MODFIX(1, 8) && defined(__linux__)) \ |
| || (ND_IS_AT_LEAST_XL_C_MODFIX(0, 5) && defined(_AIX))) |
| #define PRINTFLIKE_FUNCPTR(x,y) __attribute__((__format__(__printf__,x,y))) |
| #endif |
| #endif |
| |
| #if !defined(PRINTFLIKE) |
| #define PRINTFLIKE(x,y) |
| #endif |
| #if !defined(PRINTFLIKE_FUNCPTR) |
| #define PRINTFLIKE_FUNCPTR(x,y) |
| #endif |
| |
| /* |
| * For flagging arguments as format strings in MSVC. |
| */ |
| #ifdef _MSC_VER |
| #include <sal.h> |
| #define FORMAT_STRING(p) _Printf_format_string_ p |
| #else |
| #define FORMAT_STRING(p) p |
| #endif |
| |
| #endif /* lib_funcattrs_h */ |