# cxxabi_tweaks.h

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    00001 // Control various target specific ABI tweaks.  Generic version.
    00002
    00003 // Copyright (C) 2004, 2006, 2008, 2009 Free Software Foundation, Inc.
    00004 //
    00005 // This file is part of the GNU ISO C++ Library.  This library is free
    00006 // software; you can redistribute it and/or modify it under the
    00007 // terms of the GNU General Public License as published by the
    00008 // Free Software Foundation; either version 3, or (at your option)
    00009 // any later version.
    00010
    00011 // This library is distributed in the hope that it will be useful,
    00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00014 // GNU General Public License for more details.
    00015
    00016 // Under Section 7 of GPL version 3, you are granted additional
    00017 // permissions described in the GCC Runtime Library Exception, version
    00018 // 3.1, as published by the Free Software Foundation.
    00019
    00020 // You should have received a copy of the GNU General Public License and
    00021 // a copy of the GCC Runtime Library Exception along with this program;
    00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    00023 // <http://www.gnu.org/licenses/>.
    00024
    00025 /** @file cxxabi_tweaks.h
    00026  *  The header provides an CPU-variable interface to the C++ ABI.
    00027  */
    00028
    00029 #ifndef _CXXABI_TWEAKS_H
    00030 #define _CXXABI_TWEAKS_H 1
    00031
    00032 #ifdef __cplusplus
    00033 namespace __cxxabiv1
    00034 {
    00035   extern "C"
    00036   {
    00037 #endif
    00038
    00039   // The generic ABI uses the first byte of a 64-bit guard variable.
    00040 #define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
    00041 #define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
    00042 #define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
    00043 #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
    00044 #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
    00045   __extension__ typedef int __guard __attribute__((mode (__DI__)));
    00046
    00047   // __cxa_vec_ctor has void return type.
    00048   typedef void __cxa_vec_ctor_return_type;
    00049 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
    00050   // Constructors and destructors do not return a value.
    00051   typedef void __cxa_cdtor_return_type;
    00052
    00053 #ifdef __cplusplus
    00054   }
    00055 } // namespace __cxxabiv1
    00056 #endif
    00057
    00058 #endif