Current File : //opt/cpanel/ea-ruby27/src/passenger-release-6.0.23/src/cxx_supportlib/oxt/macros.hpp
/*
* OXT - OS eXtensions for boosT
* Provides important functionality necessary for writing robust server software.
*
* Copyright (c) 2010-2017 Phusion Holding 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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