1  // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
  2  // Free Software Foundation, Inc.
  3  //
  4  // This file is part of the GNU ISO C++ Library.  This library is free
  5  // software; you can redistribute it and/or modify it under the
  6  // terms of the GNU General Public License as published by the
  7  // Free Software Foundation; either version 2, or (at your option)
  8  // any later version.
  9  
 10  // This library is distributed in the hope that it will be useful,
 11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  // GNU General Public License for more details.
 14  
 15  // You should have received a copy of the GNU General Public License along
 16  // with this library; see the file COPYING.  If not, write to the Free
 17  // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 18  // USA.
 19  
 20  // As a special exception, you may use this file as part of a free software
 21  // library without restriction.  Specifically, if other files instantiate
 22  // templates or use macros or inline functions from this file, or you compile
 23  // this file and link it with other files to produce an executable, this
 24  // file does not by itself cause the resulting executable to be covered by
 25  // the GNU General Public License.  This exception does not however
 26  // invalidate any other reasons why the executable file might be covered by
 27  // the GNU General Public License.
 28  
 29  #include "bits/c++config.h"
 30  #include <fstream>
 31  #include <istream>
 32  #include <ostream>
 33  #include <ext/stdio_filebuf.h>
 34  #include <ext/stdio_sync_filebuf.h>
 35  
 36  // On AIX, and perhaps other systems, library initialization order is
 37  // not guaranteed.  For example, the static initializers for the main
 38  // program might run before the static initializers for this library.
 39  // That means that we cannot rely on static initialization in the
 40  // library; there is no guarantee that things will get initialized in
 41  // time.  This file contains definitions of all global variables that
 42  // require initialization as arrays of characters.
 43  
 44  // NB: asm directives can rename these non-exported, namespace
 45  // __gnu_cxx symbols into exported, namespace std symbols with the
 46  // appropriate symbol version name.
 47  // The rename syntax is 
 48  //   asm (".symver currentname,oldname@@GLIBCXX_3.2")
 49  // In macro form:
 50  // _GLIBCXX_ASM_SYMVER(currentname, oldname, GLIBCXX_3.2)
 51  
 52  _GLIBCXX_BEGIN_NAMESPACE(std)
 53  
 54    // Standard stream objects.
 55    // NB: Iff <iostream> is included, these definitions become wonky.
 56    typedef char fake_istream[sizeof(istream)]
 57    __attribute__ ((aligned(__alignof__(istream))));
 58    typedef char fake_ostream[sizeof(ostream)] 
 59    __attribute__ ((aligned(__alignof__(ostream))));
 60    fake_istream cin;
 61    fake_ostream cout;
 62    fake_ostream cerr;
 63    fake_ostream clog;
 64  
 65  #ifdef _GLIBCXX_USE_WCHAR_T
 66    typedef char fake_wistream[sizeof(wistream)] 
 67    __attribute__ ((aligned(__alignof__(wistream))));
 68    typedef char fake_wostream[sizeof(wostream)] 
 69    __attribute__ ((aligned(__alignof__(wostream))));
 70    fake_wistream wcin;
 71    fake_wostream wcout;
 72    fake_wostream wcerr;
 73    fake_wostream wclog;
 74  #endif
 75  
 76  _GLIBCXX_END_NAMESPACE
 77  
 78  namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden)
 79  {
 80    using namespace std;
 81    using namespace __gnu_cxx;
 82  
 83    // We use different stream buffer types depending on whether
 84    // ios_base::sync_with_stdio(false) has been called.
 85    typedef char fake_stdiobuf[sizeof(stdio_sync_filebuf<char>)]
 86    __attribute__ ((aligned(__alignof__(stdio_sync_filebuf<char>))));
 87    fake_stdiobuf buf_cout_sync;
 88    fake_stdiobuf buf_cin_sync;
 89    fake_stdiobuf buf_cerr_sync;
 90  
 91    typedef char fake_filebuf[sizeof(stdio_filebuf<char>)]
 92    __attribute__ ((aligned(__alignof__(stdio_filebuf<char>))));
 93    fake_filebuf buf_cout;
 94    fake_filebuf buf_cin;
 95    fake_filebuf buf_cerr;
 96  
 97  #ifdef _GLIBCXX_USE_WCHAR_T
 98    typedef char fake_wstdiobuf[sizeof(stdio_sync_filebuf<wchar_t>)]
 99    __attribute__ ((aligned(__alignof__(stdio_sync_filebuf<wchar_t>))));
100    fake_wstdiobuf buf_wcout_sync;
101    fake_wstdiobuf buf_wcin_sync;
102    fake_wstdiobuf buf_wcerr_sync;
103  
104    typedef char fake_wfilebuf[sizeof(stdio_filebuf<wchar_t>)]
105    __attribute__ ((aligned(__alignof__(stdio_filebuf<wchar_t>))));
106    fake_wfilebuf buf_wcout;
107    fake_wfilebuf buf_wcin;
108    fake_wfilebuf buf_wcerr;
109  #endif
110  } // namespace __gnu_internal