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