1// Control various target specific ABI tweaks. Generic version. 2 3// Copyright (C) 2004-2020 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 3, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25/** @file bits/cxxabi_tweaks.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{cxxabi.h} 28 */ 29 30#ifndef _CXXABI_TWEAKS_H 31#define _CXXABI_TWEAKS_H 1 32 33#ifdef __cplusplus 34namespace __cxxabiv1 35{ 36 extern "C" 37 { 38#endif 39 40 // The generic ABI uses the first byte of a 64-bit guard variable. 41#define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0) 42#define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1 43#define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1) 44#define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1) 45#define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1) 46 __extension__ typedef int __guard __attribute__((mode (__DI__))); 47 48 // __cxa_vec_ctor has void return type. 49 typedef void __cxa_vec_ctor_return_type; 50#define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return 51 // Constructors and destructors do not return a value. 52 typedef void __cxa_cdtor_return_type; 53 54#ifdef __cplusplus 55 } 56} // namespace __cxxabiv1 57#endif 58 59#endif 60