libstdc++
cxxabi_tweaks.h
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1 // Control various target specific ABI tweaks. Generic version.
2 
3 // Copyright (C) 2004, 2006, 2008, 2009 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 cxxabi_tweaks.h
26  * The header provides an CPU-variable interface to the C++ ABI.
27  */
28 
29 #ifndef _CXXABI_TWEAKS_H
30 #define _CXXABI_TWEAKS_H 1
31 
32 #ifdef __cplusplus
33 namespace __cxxabiv1
34 {
35  extern "C"
36  {
37 #endif
38 
39  // The generic ABI uses the first byte of a 64-bit guard variable.
40 #define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
41 #define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
42 #define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
43 #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
44 #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
45  __extension__ typedef int __guard __attribute__((mode (__DI__)));
46 
47  // __cxa_vec_ctor has void return type.
48  typedef void __cxa_vec_ctor_return_type;
49 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
50  // Constructors and destructors do not return a value.
51  typedef void __cxa_cdtor_return_type;
52 
53 #ifdef __cplusplus
54  }
55 } // namespace __cxxabiv1
56 #endif
57 
58 #endif