libstdc++-v3/src/globals_io.cc

   1 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2009
   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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
  16 // permissions described in the GCC Runtime Library Exception, version
  17 // 3.1, as published by the Free Software Foundation.
  18
  19 // You should have received a copy of the GNU General Public License and
  20 // a copy of the GCC Runtime Library Exception along with this program;
  21 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22 // <http://www.gnu.org/licenses/>.
  23
  24 #include "bits/c++config.h"
  25 #include <fstream>
  26 #include <istream>
  27 #include <ostream>
  28 #include <ext/stdio_filebuf.h>
  29 #include <ext/stdio_sync_filebuf.h>
  30
  31 // On AIX, and perhaps other systems, library initialization order is
  32 // not guaranteed.  For example, the static initializers for the main
  33 // program might run before the static initializers for this library.
  34 // That means that we cannot rely on static initialization in the
  35 // library; there is no guarantee that things will get initialized in
  36 // time.  This file contains definitions of all global variables that
  37 // require initialization as arrays of characters.
  38
  39 // NB: asm directives can rename these non-exported, namespace
  40 // __gnu_cxx symbols into exported, namespace std symbols with the
  41 // appropriate symbol version name.
  42 // The rename syntax is
  43 //   asm (".symver currentname,oldname@@GLIBCXX_3.2")
  44 // In macro form:
  45 // _GLIBCXX_ASM_SYMVER(currentname, oldname, GLIBCXX_3.2)
  46
  47 _GLIBCXX_BEGIN_NAMESPACE(std)
  48
  49   // Standard stream objects.
  50   // NB: Iff <iostream> is included, these definitions become wonky.
  51   typedef char fake_istream[sizeof(istream)]
  52   __attribute__ ((aligned(__alignof__(istream))));
  53   typedef char fake_ostream[sizeof(ostream)]
  54   __attribute__ ((aligned(__alignof__(ostream))));
  55   fake_istream cin;
  56   fake_ostream cout;
  57   fake_ostream cerr;
  58   fake_ostream clog;
  59
  60 #ifdef _GLIBCXX_USE_WCHAR_T
  61   typedef char fake_wistream[sizeof(wistream)]
  62   __attribute__ ((aligned(__alignof__(wistream))));
  63   typedef char fake_wostream[sizeof(wostream)]
  64   __attribute__ ((aligned(__alignof__(wostream))));
  65   fake_wistream wcin;
  66   fake_wostream wcout;
  67   fake_wostream wcerr;
  68   fake_wostream wclog;
  69 #endif
  70
  71 _GLIBCXX_END_NAMESPACE
  72
  73 namespace __gnu_internal _GLIBCXX_VISIBILITY_ATTR(hidden)
  74 {
  75   using namespace std;
  76   using namespace __gnu_cxx;
  77
  78   // We use different stream buffer types depending on whether
  79   // ios_base::sync_with_stdio(false) has been called.
  80   typedef char fake_stdiobuf[sizeof(stdio_sync_filebuf<char>)]
  81   __attribute__ ((aligned(__alignof__(stdio_sync_filebuf<char>))));
  82   fake_stdiobuf buf_cout_sync;
  83   fake_stdiobuf buf_cin_sync;
  84   fake_stdiobuf buf_cerr_sync;
  85
  86   typedef char fake_filebuf[sizeof(stdio_filebuf<char>)]
  87   __attribute__ ((aligned(__alignof__(stdio_filebuf<char>))));
  88   fake_filebuf buf_cout;
  89   fake_filebuf buf_cin;
  90   fake_filebuf buf_cerr;
  91
  92 #ifdef _GLIBCXX_USE_WCHAR_T
  93   typedef char fake_wstdiobuf[sizeof(stdio_sync_filebuf<wchar_t>)]
  94   __attribute__ ((aligned(__alignof__(stdio_sync_filebuf<wchar_t>))));
  95   fake_wstdiobuf buf_wcout_sync;
  96   fake_wstdiobuf buf_wcin_sync;
  97   fake_wstdiobuf buf_wcerr_sync;
  98
  99   typedef char fake_wfilebuf[sizeof(stdio_filebuf<wchar_t>)]
 100   __attribute__ ((aligned(__alignof__(stdio_filebuf<wchar_t>))));
 101   fake_wfilebuf buf_wcout;
 102   fake_wfilebuf buf_wcin;
 103   fake_wfilebuf buf_wcerr;
 104 #endif
 105 } // namespace __gnu_internal