libstdc++-v3/src/globals_io.cc

   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_ATTR(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