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Editing: macros.hpp
/* * OXT - OS eXtensions for boosT * Provides important functionality necessary for writing robust server software. * * Copyright (c) 2010-2025 Asynchronous B.V. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #ifndef _OXT_MACROS_HPP_ #define _OXT_MACROS_HPP_ /** * Specialized macros. * * These macros provide more specialized features which are not needed * so often by application programmers. */ #define OXT_GCC_VERSION (__GNUC__ * 10000 \ + __GNUC_MINOR__ * 100 \ + __GNUC_PATCHLEVEL__) #if (defined(__GNUC__) && (__GNUC__ > 2)) || defined(IN_DOXYGEN) /** * Indicate that the given expression is likely to be true. * This allows the CPU to better perform branch prediction. */ #define OXT_LIKELY(expr) __builtin_expect((expr), 1) /** * Indicate that the given expression is likely to be false. * This allows the CPU to better perform branch prediction. */ #define OXT_UNLIKELY(expr) __builtin_expect((expr), 0) /** * Force inlining of the given function. */ #define OXT_FORCE_INLINE __attribute__((always_inline)) #define OXT_PURE __attribute__((pure)) #if __GNUC__ >= 4 #define OXT_RESTRICT __restrict__ #else #define OXT_RESTRICT #endif #ifndef restrict /** * The C99 'restrict' keyword, now usable in C++. */ #define restrict OXT_RESTRICT #endif #ifndef restrict_ref /** * The C99 'restrict' keyword, for use with C++ references. * On compilers that support 'restrict' in C++ but not on * references, this macro does nothing. */ #define restrict_ref OXT_RESTRICT #endif #else #define OXT_LIKELY(expr) expr #define OXT_UNLIKELY(expr) expr #define OXT_FORCE_INLINE #define OXT_PURE #define restrict #define restrict_ref #endif /* * GCC supports the __thread keyword on x86 since version 3.3, but versions earlier * than 4.1.2 have bugs (http://gcc.gnu.org/ml/gcc-bugs/2006-09/msg02275.html). * * FreeBSD 5 supports the __thread keyword, and everything works fine in * micro-tests, but in mod_passenger the thread-local variables are initialized * to unaligned addresses for some weird reason, thereby causing bus errors. * * GCC on OpenBSD supports __thread, but any access to such a variable * results in a segfault. * * Solaris does support __thread, but often it's not compiled into default GCC * packages (not to mention it's not available for Sparc). Playing it safe... * * On MacOS X, neither gcc nor llvm-gcc support the __thread keyword, but Clang * does. It works on at least clang >= 3.0. */ #ifndef PASSENGER_DISABLE_THREAD_LOCAL_STORAGE #if defined(__APPLE__) #if defined(__clang__) && __clang_major__ >= 3 #define OXT_THREAD_LOCAL_KEYWORD_SUPPORTED #endif #elif defined(__GNUC__) && OXT_GCC_VERSION >= 40102 #if !defined(__SOLARIS__) && !defined(__OpenBSD__) #define OXT_THREAD_LOCAL_KEYWORD_SUPPORTED #endif #endif #endif #if defined(__has_feature) #if __has_feature(address_sanitizer) #define OXT_NO_SANITIZE(args) __attribute__((no_sanitize(args))) #endif #endif #ifndef OXT_NO_SANITIZE #define OXT_NO_SANITIZE(args) #endif #endif /* _OXT_MACROS_HPP_ */
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