libcxx/src/iostream.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "__std_stream"
  10 #include "__locale"
  11 #include "string"
  12 #include "new"
  13
  14 #define _str(s) #s
  15 #define str(s) _str(s)
  16 #define _LIBCPP_ABI_NAMESPACE_STR str(_LIBCPP_ABI_NAMESPACE)
  17
  18 _LIBCPP_BEGIN_NAMESPACE_STD
  19
  20 _ALIGNAS_TYPE (istream) _LIBCPP_FUNC_VIS char cin[sizeof(istream)]
  21 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
  22 __asm__("?cin@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_istream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
  23 #endif
  24 ;
  25 _ALIGNAS_TYPE (__stdinbuf<char> ) static char __cin[sizeof(__stdinbuf <char>)];
  26 static mbstate_t mb_cin;
  27
  28 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
  29 _ALIGNAS_TYPE (wistream) _LIBCPP_FUNC_VIS char wcin[sizeof(wistream)]
  30 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
  31 __asm__("?wcin@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_istream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
  32 #endif
  33 ;
  34 _ALIGNAS_TYPE (__stdinbuf<wchar_t> ) static char __wcin[sizeof(__stdinbuf <wchar_t>)];
  35 static mbstate_t mb_wcin;
  36 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
  37
  38 _ALIGNAS_TYPE (ostream) _LIBCPP_FUNC_VIS char cout[sizeof(ostream)]
  39 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
  40 __asm__("?cout@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
  41 #endif
  42 ;
  43 _ALIGNAS_TYPE (__stdoutbuf<char>) static char __cout[sizeof(__stdoutbuf<char>)];
  44 static mbstate_t mb_cout;
  45
  46 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
  47 _ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wcout[sizeof(wostream)]
  48 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
  49 __asm__("?wcout@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
  50 #endif
  51 ;
  52 _ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcout[sizeof(__stdoutbuf<wchar_t>)];
  53 static mbstate_t mb_wcout;
  54 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
  55
  56 _ALIGNAS_TYPE (ostream) _LIBCPP_FUNC_VIS char cerr[sizeof(ostream)]
  57 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
  58 __asm__("?cerr@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
  59 #endif
  60 ;
  61 _ALIGNAS_TYPE (__stdoutbuf<char>) static char __cerr[sizeof(__stdoutbuf<char>)];
  62 static mbstate_t mb_cerr;
  63
  64 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
  65 _ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wcerr[sizeof(wostream)]
  66 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
  67 __asm__("?wcerr@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
  68 #endif
  69 ;
  70 _ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcerr[sizeof(__stdoutbuf<wchar_t>)];
  71 static mbstate_t mb_wcerr;
  72 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
  73
  74 _ALIGNAS_TYPE (ostream) _LIBCPP_FUNC_VIS char clog[sizeof(ostream)]
  75 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
  76 __asm__("?clog@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
  77 #endif
  78 ;
  79
  80 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
  81 _ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wclog[sizeof(wostream)]
  82 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
  83 __asm__("?wclog@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
  84 #endif
  85 ;
  86 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
  87
  88 // Hacky way to make the compiler believe that we're inside a system header so
  89 // it doesn't flag the use of the init_priority attribute with a value that's
  90 // reserved for the implementation (we're the implementation).
  91 # 80 "iostream.cpp" 1 3
  92 _LIBCPP_HIDDEN ios_base::Init __start_std_streams _LIBCPP_INIT_PRIORITY_MAX;
  93 # 82 "iostream.cpp" 2
  94
  95 // On Windows the TLS storage for locales needs to be initialized before we create
  96 // the standard streams, otherwise it may not be alive during program termination
  97 // when we flush the streams.
  98 static void force_locale_initialization() {
  99 #if defined(_LIBCPP_MSVCRT_LIKE)
 100   static bool once = []() {
 101     auto loc = newlocale(LC_ALL_MASK, "C", 0);
 102     {
 103         __libcpp_locale_guard g(loc); // forces initialization of locale TLS
 104         ((void)g);
 105     }
 106     freelocale(loc);
 107     return true;
 108   }();
 109   ((void)once);
 110 #endif
 111 }
 112
 113 class DoIOSInit {
 114 public:
 115         DoIOSInit();
 116         ~DoIOSInit();
 117 };
 118
 119 DoIOSInit::DoIOSInit()
 120 {
 121     force_locale_initialization();
 122
 123     istream* cin_ptr  = ::new(cin)  istream(::new(__cin)  __stdinbuf <char>(stdin, &mb_cin));
 124     ostream* cout_ptr = ::new(cout) ostream(::new(__cout) __stdoutbuf<char>(stdout, &mb_cout));
 125     ostream* cerr_ptr = ::new(cerr) ostream(::new(__cerr) __stdoutbuf<char>(stderr, &mb_cerr));
 126                         ::new(clog) ostream(cerr_ptr->rdbuf());
 127     cin_ptr->tie(cout_ptr);
 128     _VSTD::unitbuf(*cerr_ptr);
 129     cerr_ptr->tie(cout_ptr);
 130
 131 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 132     wistream* wcin_ptr  = ::new(wcin)  wistream(::new(__wcin)  __stdinbuf <wchar_t>(stdin, &mb_wcin));
 133     wostream* wcout_ptr = ::new(wcout) wostream(::new(__wcout) __stdoutbuf<wchar_t>(stdout, &mb_wcout));
 134     wostream* wcerr_ptr = ::new(wcerr) wostream(::new(__wcerr) __stdoutbuf<wchar_t>(stderr, &mb_wcerr));
 135                           ::new(wclog) wostream(wcerr_ptr->rdbuf());
 136
 137     wcin_ptr->tie(wcout_ptr);
 138     _VSTD::unitbuf(*wcerr_ptr);
 139     wcerr_ptr->tie(wcout_ptr);
 140 #endif
 141 }
 142
 143 DoIOSInit::~DoIOSInit()
 144 {
 145     ostream* cout_ptr = reinterpret_cast<ostream*>(cout);
 146     cout_ptr->flush();
 147     ostream* clog_ptr = reinterpret_cast<ostream*>(clog);
 148     clog_ptr->flush();
 149
 150 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 151     wostream* wcout_ptr = reinterpret_cast<wostream*>(wcout);
 152     wcout_ptr->flush();
 153     wostream* wclog_ptr = reinterpret_cast<wostream*>(wclog);
 154     wclog_ptr->flush();
 155 #endif
 156 }
 157
 158 ios_base::Init::Init()
 159 {
 160     static DoIOSInit init_the_streams; // gets initialized once
 161 }
 162
 163 ios_base::Init::~Init()
 164 {
 165 }
 166
 167 _LIBCPP_END_NAMESPACE_STD