1// Copyright (C) 2013 The Android Open Source Project 2// All rights reserved. 3// 4// Redistribution and use in source and binary forms, with or without 5// modification, are permitted provided that the following conditions 6// are met: 7// 1. Redistributions of source code must retain the above copyright 8// notice, this list of conditions and the following disclaimer. 9// 2. Redistributions in binary form must reproduce the above copyright 10// notice, this list of conditions and the following disclaimer in the 11// documentation and/or other materials provided with the distribution. 12// 3. Neither the name of the project nor the names of its contributors 13// may be used to endorse or promote products derived from this software 14// without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 17// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19// ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 20// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26// SUCH DAMAGE. 27 28#ifndef __GABIXX_CONFIG_H__ 29#define __GABIXX_CONFIG_H__ 30 31// Used to tag functions that never return. 32// IMPORTANT: This must appear at the left of function definitions, 33// as in: 34// _GABIXX_NORETURN <return-type> <name>(....) { ... } 35#define _GABIXX_NORETURN __attribute__((__noreturn__)) 36 37// Use _GABIXX_NOEXCEPT to use the equivalent of the C++11 noexcept 38// qualifier at the end of function declarations. 39// 40// _GABIXX_NOEXCEPT_() only in C++11 mode to use the noexcept() operator. 41// _GABIXX_NOEXCEPT_CXX11_ONLY uses noexcept in C++11, nothing otherwise. 42#if __cplusplus >= 201103L 43# define _GABIXX_NOEXCEPT noexcept 44# define _GABIXX_NOEXCEPT_(x) noexcept(x) 45# define _GABIXX_NOEXCEPT_CXX11_ONLY noexcept 46#else 47# define _GABIXX_NOEXCEPT throw() 48# define _GABIXX_NOEXCEPT_(x) /* nothing */ 49# define _GABIXX_NOEXCEPT_CXX11_ONLY /* nothing */ 50#endif 51 52// Use _GABIXX_HIDDEN to declare internal functions of GAbi++ that should 53// never be exposed to client code. 54#define _GABIXX_HIDDEN __attribute__((__visibility__("hidden"))) 55 56// Use _GABIXX_DEFAULT to prevent user command -fvisibility=hidden 57#define _GABIXX_DEFAULT __attribute__((__visibility__("default"))) 58 59// Use _GABIXX_WEAK to define a symbol with weak linkage. 60#define _GABIXX_WEAK __attribute__((__weak__)) 61 62// Use _GABIXX_ALWAYS_INLINE to declare a function that shall always be 63// inlined. Note that the always_inline doesn't make a function inline 64// per se. 65#define _GABIXX_ALWAYS_INLINE \ 66 inline __attribute__((__always_inline__)) 67 68// _GABIXX_HAS_EXCEPTIONS will be 1 if the current source file is compiled 69// with exceptions support, or 0 otherwise. 70#if !defined(__clang__) && !defined(__has_feature) 71#define __has_feature(x) 0 72#endif 73 74#if (defined(__clang__) && __has_feature(cxx_exceptions)) || \ 75 (defined(__GNUC__) && defined(__EXCEPTIONS)) 76#define _GABIXX_HAS_EXCEPTIONS 1 77#else 78#define _GABIXX_HAS_EXCEPTIONS 0 79#endif 80 81// TODO(digit): Use __atomic_load_acq_rel when available. 82#define __gabixx_sync_load(address) \ 83 __sync_fetch_and_add((address), (__typeof__(*(address)))0) 84 85// Clang provides __sync_swap(), but GCC does not. 86// IMPORTANT: For GCC, __sync_lock_test_and_set has acquire semantics only 87// so an explicit __sync_synchronize is needed to ensure a full barrier. 88// TODO(digit): Use __atomic_swap_acq_rel when available. 89#if defined(__clang__) 90# define __gabixx_sync_swap(address,value) __sync_swap((address),(value)) 91#else 92# define __gabixx_sync_swap(address, value) \ 93 __extension__ ({ \ 94 __typeof__(*(address)) __ret = __sync_lock_test_and_set((address),(value)); \ 95 __sync_synchronize(); \ 96 __ret; \ 97 }) 98#endif 99 100#endif // __GABIXX_CONFIG_H__ 101