# cxxabi_tweaks.h

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    00001 // Control various target specific ABI tweaks.  Generic version.
    00002
    00003 // Copyright (C) 2004, 2006 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 2, 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 // You should have received a copy of the GNU General Public License along
    00017 // with this library; see the file COPYING.  If not, write to the Free
    00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
    00019 // USA.
    00020
    00021 // As a special exception, you may use this file as part of a free software
    00022 // library without restriction.  Specifically, if other files instantiate
    00023 // templates or use macros or inline functions from this file, or you compile
    00024 // this file and link it with other files to produce an executable, this
    00025 // file does not by itself cause the resulting executable to be covered by
    00026 // the GNU General Public License.  This exception does not however
    00027 // invalidate any other reasons why the executable file might be covered by
    00028 // the GNU General Public License.
    00029
    00030 /** @file cxxabi_tweaks.h
    00031  *  The header provides an CPU-variable interface to the C++ ABI.
    00032  */
    00033
    00034 #ifndef _CXXABI_TWEAKS_H
    00035 #define _CXXABI_TWEAKS_H 1
    00036
    00037 #ifdef __cplusplus
    00038 namespace __cxxabiv1
    00039 {
    00040   extern "C"
    00041   {
    00042 #endif
    00043
    00044   // The generic ABI uses the first byte of a 64-bit guard variable.
    00045 #define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
    00046 #define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
    00047   __extension__ typedef int __guard __attribute__((mode (__DI__)));
    00048
    00049   // __cxa_vec_ctor has void return type.
    00050   typedef void __cxa_vec_ctor_return_type;
    00051 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
    00052   // Constructors and destructors do not return a value.
    00053   typedef void __cxa_cdtor_return_type;
    00054
    00055 #ifdef __cplusplus
    00056   }
    00057 } // namespace __cxxabiv1
    00058 #endif
    00059
    00060 #endif