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      1 //===------------------------ iostream.cpp --------------------------------===//
      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 #ifndef _LIBCPP_HAS_NO_STDIN
     21 _ALIGNAS_TYPE (istream) _LIBCPP_FUNC_VIS char cin[sizeof(istream)]
     22 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
     23 __asm__("?cin@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_istream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
     24 #endif
     25 ;
     26 _ALIGNAS_TYPE (__stdinbuf<char> ) static char __cin[sizeof(__stdinbuf <char>)];
     27 static mbstate_t mb_cin;
     28 _ALIGNAS_TYPE (wistream) _LIBCPP_FUNC_VIS char wcin[sizeof(wistream)]
     29 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
     30 __asm__("?wcin@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_istream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
     31 #endif
     32 ;
     33 _ALIGNAS_TYPE (__stdinbuf<wchar_t> ) static char __wcin[sizeof(__stdinbuf <wchar_t>)];
     34 static mbstate_t mb_wcin;
     35 #endif
     36 
     37 #ifndef _LIBCPP_HAS_NO_STDOUT
     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 _ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wcout[sizeof(wostream)]
     46 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
     47 __asm__("?wcout@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
     48 #endif
     49 ;
     50 _ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcout[sizeof(__stdoutbuf<wchar_t>)];
     51 static mbstate_t mb_wcout;
     52 #endif
     53 
     54 _ALIGNAS_TYPE (ostream) _LIBCPP_FUNC_VIS char cerr[sizeof(ostream)]
     55 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
     56 __asm__("?cerr@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
     57 #endif
     58 ;
     59 _ALIGNAS_TYPE (__stdoutbuf<char>) static char __cerr[sizeof(__stdoutbuf<char>)];
     60 static mbstate_t mb_cerr;
     61 _ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wcerr[sizeof(wostream)]
     62 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
     63 __asm__("?wcerr@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
     64 #endif
     65 ;
     66 _ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcerr[sizeof(__stdoutbuf<wchar_t>)];
     67 static mbstate_t mb_wcerr;
     68 
     69 _ALIGNAS_TYPE (ostream) _LIBCPP_FUNC_VIS char clog[sizeof(ostream)]
     70 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
     71 __asm__("?clog@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
     72 #endif
     73 ;
     74 _ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wclog[sizeof(wostream)]
     75 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
     76 __asm__("?wclog@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
     77 #endif
     78 ;
     79 
     80 _LIBCPP_HIDDEN ios_base::Init __start_std_streams _LIBCPP_INIT_PRIORITY_MAX;
     81 
     82 // On Windows the TLS storage for locales needs to be initialized before we create
     83 // the standard streams, otherwise it may not be alive during program termination
     84 // when we flush the streams.
     85 static void force_locale_initialization() {
     86 #if defined(_LIBCPP_MSVCRT_LIKE)
     87   static bool once = []() {
     88     auto loc = newlocale(LC_ALL_MASK, "C", 0);
     89     {
     90         __libcpp_locale_guard g(loc); // forces initialization of locale TLS
     91         ((void)g);
     92     }
     93     freelocale(loc);
     94     return true;
     95   }();
     96   ((void)once);
     97 #endif
     98 }
     99 
    100 class DoIOSInit {
    101 public:
    102 	DoIOSInit();
    103 	~DoIOSInit();
    104 };
    105 
    106 DoIOSInit::DoIOSInit()
    107 {
    108     force_locale_initialization();
    109 
    110 #ifndef _LIBCPP_HAS_NO_STDIN
    111     istream* cin_ptr  = ::new(cin)  istream(::new(__cin)  __stdinbuf <char>(stdin, &mb_cin));
    112     wistream* wcin_ptr  = ::new(wcin)  wistream(::new(__wcin)  __stdinbuf <wchar_t>(stdin, &mb_wcin));
    113 #endif
    114 #ifndef _LIBCPP_HAS_NO_STDOUT
    115     ostream* cout_ptr = ::new(cout) ostream(::new(__cout) __stdoutbuf<char>(stdout, &mb_cout));
    116     wostream* wcout_ptr = ::new(wcout) wostream(::new(__wcout) __stdoutbuf<wchar_t>(stdout, &mb_wcout));
    117 #endif
    118     ostream* cerr_ptr = ::new(cerr) ostream(::new(__cerr) __stdoutbuf<char>(stderr, &mb_cerr));
    119                         ::new(clog) ostream(cerr_ptr->rdbuf());
    120     wostream* wcerr_ptr = ::new(wcerr) wostream(::new(__wcerr) __stdoutbuf<wchar_t>(stderr, &mb_wcerr));
    121                           ::new(wclog) wostream(wcerr_ptr->rdbuf());
    122 
    123 #if !defined(_LIBCPP_HAS_NO_STDIN) && !defined(_LIBCPP_HAS_NO_STDOUT)
    124     cin_ptr->tie(cout_ptr);
    125     wcin_ptr->tie(wcout_ptr);
    126 #endif
    127     _VSTD::unitbuf(*cerr_ptr);
    128     _VSTD::unitbuf(*wcerr_ptr);
    129 #ifndef _LIBCPP_HAS_NO_STDOUT
    130     cerr_ptr->tie(cout_ptr);
    131     wcerr_ptr->tie(wcout_ptr);
    132 #endif
    133 }
    134 
    135 DoIOSInit::~DoIOSInit()
    136 {
    137 #ifndef _LIBCPP_HAS_NO_STDOUT
    138     ostream* cout_ptr = reinterpret_cast<ostream*>(cout);
    139     wostream* wcout_ptr = reinterpret_cast<wostream*>(wcout);
    140     cout_ptr->flush();
    141     wcout_ptr->flush();
    142 #endif
    143 
    144     ostream* clog_ptr = reinterpret_cast<ostream*>(clog);
    145     wostream* wclog_ptr = reinterpret_cast<wostream*>(wclog);
    146     clog_ptr->flush();
    147     wclog_ptr->flush();
    148 }
    149 
    150 ios_base::Init::Init()
    151 {
    152     static DoIOSInit init_the_streams; // gets initialized once
    153 }
    154 
    155 ios_base::Init::~Init()
    156 {
    157 }
    158 
    159 _LIBCPP_END_NAMESPACE_STD
    160