libstdc++-v3/config/cpu/generic/cxxabi_tweaks.h

   1 // Control various target specific ABI tweaks.  Generic version.
   2
   3 // Copyright (C) 2004, 2006, 2008 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
  38 namespace __cxxabiv1
  39 {
  40   extern "C"
  41   {
  42 #endif
  43
  44   // The generic ABI uses the first byte of a 64-bit guard variable.
  45 #define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
  46 #define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
  47 #define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
  48 #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
  49 #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
  50   __extension__ typedef int __guard __attribute__((mode (__DI__)));
  51
  52   // __cxa_vec_ctor has void return type.
  53   typedef void __cxa_vec_ctor_return_type;
  54 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
  55   // Constructors and destructors do not return a value.
  56   typedef void __cxa_cdtor_return_type;
  57
  58 #ifdef __cplusplus
  59   }
  60 } // namespace __cxxabiv1
  61 #endif
  62
  63 #endif