1// Control various target specific ABI tweaks.  ARM version.
2
3// Copyright (C) 2004, 2006 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 2, 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// You should have received a copy of the GNU General Public License along
17// with this library; see the file COPYING.  If not, write to the Free
18// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19// USA.
20
21// As a special exception, you may use this file as part of a free software
22// library without restriction.  Specifically, if other files instantiate
23// templates or use macros or inline functions from this file, or you compile
24// this file and link it with other files to produce an executable, this
25// file does not by itself cause the resulting executable to be covered by
26// the GNU General Public License.  This exception does not however
27// invalidate any other reasons why the executable file might be covered by
28// the GNU General Public License.
29
30/** @file cxxabi_tweaks.h
31 *  The header provides an CPU-variable interface to the C++ ABI.
32 */
33
34#ifndef _CXXABI_TWEAKS_H
35#define _CXXABI_TWEAKS_H 1
36
37#ifdef __cplusplus
38namespace __cxxabiv1
39{
40  extern "C"
41  {
42#endif
43
44#ifdef __ARM_EABI__
45  // The ARM EABI uses the least significant bit of a 32-bit
46  // guard variable.  */
47#define _GLIBCXX_GUARD_TEST(x) ((*(x) & 1) != 0)
48#define _GLIBCXX_GUARD_SET(x) *(x) = 1
49  typedef int __guard;
50
51  // We also want the element size in array cookies.
52#define _GLIBCXX_ELTSIZE_IN_COOKIE 1
53
54  // __cxa_vec_ctor should return a pointer to the array.
55  typedef void * __cxa_vec_ctor_return_type;
56#define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return x
57  // Constructors and destructors return the "this" pointer.
58  typedef void * __cxa_cdtor_return_type;
59
60#else // __ARM_EABI__
61
62  // The generic ABI uses the first byte of a 64-bit guard variable.
63#define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
64#define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
65  __extension__ typedef int __guard __attribute__((mode (__DI__)));
66
67  // __cxa_vec_ctor has void return type.
68  typedef void __cxa_vec_ctor_return_type;
69#define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
70  // Constructors and destructors do not return a value.
71  typedef void __cxa_cdtor_return_type;
72
73#endif //!__ARM_EABI__
74
75#ifdef __cplusplus
76  }
77} // namespace __cxxabiv1
78#endif
79
80#endif
81