libstdc++-v3/src/c++98/globals_io.cc

   1 // Copyright (C) 2001-2018 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // Under Section 7 of GPL version 3, you are granted additional
  15 // permissions described in the GCC Runtime Library Exception, version
  16 // 3.1, as published by the Free Software Foundation.
  17
  18 // You should have received a copy of the GNU General Public License and
  19 // a copy of the GCC Runtime Library Exception along with this program;
  20 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #include "bits/c++config.h"
  24 #include <fstream>
  25 #include <istream>
  26 #include <ostream>
  27 #include <ext/stdio_filebuf.h>
  28 #include <ext/stdio_sync_filebuf.h>
  29
  30 // On AIX, and perhaps other systems, library initialization order is
  31 // not guaranteed.  For example, the static initializers for the main
  32 // program might run before the static initializers for this library.
  33 // That means that we cannot rely on static initialization in the
  34 // library; there is no guarantee that things will get initialized in
  35 // time.  This file contains definitions of all global variables that
  36 // require initialization as arrays of characters.
  37
  38 // NB: asm directives can rename these non-exported, namespace
  39 // __gnu_cxx symbols into exported, namespace std symbols with the
  40 // appropriate symbol version name.
  41 // The rename syntax is
  42 //   asm (".symver currentname,oldname@@GLIBCXX_3.2")
  43 // In macro form:
  44 // _GLIBCXX_ASM_SYMVER(currentname, oldname, GLIBCXX_3.2)
  45
  46 namespace std _GLIBCXX_VISIBILITY(default)
  47 {
  48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  49
  50   // Standard stream objects.
  51   // NB: Iff <iostream> is included, these definitions become wonky.
  52   typedef char fake_istream[sizeof(istream)]
  53   __attribute__ ((aligned(__alignof__(istream))));
  54   typedef char fake_ostream[sizeof(ostream)]
  55   __attribute__ ((aligned(__alignof__(ostream))));
  56   fake_istream cin;
  57   fake_ostream cout;
  58   fake_ostream cerr;
  59   fake_ostream clog;
  60
  61 #ifdef _GLIBCXX_USE_WCHAR_T
  62   typedef char fake_wistream[sizeof(wistream)]
  63   __attribute__ ((aligned(__alignof__(wistream))));
  64   typedef char fake_wostream[sizeof(wostream)]
  65   __attribute__ ((aligned(__alignof__(wostream))));
  66   fake_wistream wcin;
  67   fake_wostream wcout;
  68   fake_wostream wcerr;
  69   fake_wostream wclog;
  70 #endif
  71
  72 _GLIBCXX_END_NAMESPACE_VERSION
  73 } // namespace
  74
  75 namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden)
  76 {
  77   using namespace std;
  78   using namespace __gnu_cxx;
  79
  80   // We use different stream buffer types depending on whether
  81   // ios_base::sync_with_stdio(false) has been called.
  82   typedef char fake_stdiobuf[sizeof(stdio_sync_filebuf<char>)]
  83   __attribute__ ((aligned(__alignof__(stdio_sync_filebuf<char>))));
  84   fake_stdiobuf buf_cout_sync;
  85   fake_stdiobuf buf_cin_sync;
  86   fake_stdiobuf buf_cerr_sync;
  87
  88   typedef char fake_filebuf[sizeof(stdio_filebuf<char>)]
  89   __attribute__ ((aligned(__alignof__(stdio_filebuf<char>))));
  90   fake_filebuf buf_cout;
  91   fake_filebuf buf_cin;
  92   fake_filebuf buf_cerr;
  93
  94 #ifdef _GLIBCXX_USE_WCHAR_T
  95   typedef char fake_wstdiobuf[sizeof(stdio_sync_filebuf<wchar_t>)]
  96   __attribute__ ((aligned(__alignof__(stdio_sync_filebuf<wchar_t>))));
  97   fake_wstdiobuf buf_wcout_sync;
  98   fake_wstdiobuf buf_wcin_sync;
  99   fake_wstdiobuf buf_wcerr_sync;
 100
 101   typedef char fake_wfilebuf[sizeof(stdio_filebuf<wchar_t>)]
 102   __attribute__ ((aligned(__alignof__(stdio_filebuf<wchar_t>))));
 103   fake_wfilebuf buf_wcout;
 104   fake_wfilebuf buf_wcin;
 105   fake_wfilebuf buf_wcerr;
 106 #endif
 107 } // namespace __gnu_internal