src/iostream.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include <__locale>
#include <__std_stream>
#include <new>
#include <string>

#define _str(s) #s
#define str(s) _str(s)
#define _LIBCPP_ABI_NAMESPACE_STR str(_LIBCPP_ABI_NAMESPACE)

_LIBCPP_BEGIN_NAMESPACE_STD

_ALIGNAS_TYPE (istream) _LIBCPP_FUNC_VIS char cin[sizeof(istream)]
#if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
__asm__("?cin@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_istream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
#endif
;
_ALIGNAS_TYPE (__stdinbuf<char> ) static char __cin[sizeof(__stdinbuf <char>)];
static mbstate_t mb_cin;

#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
_ALIGNAS_TYPE (wistream) _LIBCPP_FUNC_VIS char wcin[sizeof(wistream)]
#if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
__asm__("?wcin@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_istream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
#endif
;
_ALIGNAS_TYPE (__stdinbuf<wchar_t> ) static char __wcin[sizeof(__stdinbuf <wchar_t>)];
static mbstate_t mb_wcin;
#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS

_ALIGNAS_TYPE (ostream) _LIBCPP_FUNC_VIS char cout[sizeof(ostream)]
#if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
__asm__("?cout@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
#endif
;
_ALIGNAS_TYPE (__stdoutbuf<char>) static char __cout[sizeof(__stdoutbuf<char>)];
static mbstate_t mb_cout;

#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
_ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wcout[sizeof(wostream)]
#if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
__asm__("?wcout@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
#endif
;
_ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcout[sizeof(__stdoutbuf<wchar_t>)];
static mbstate_t mb_wcout;
#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS

_ALIGNAS_TYPE (ostream) _LIBCPP_FUNC_VIS char cerr[sizeof(ostream)]
#if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
__asm__("?cerr@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
#endif
;
_ALIGNAS_TYPE (__stdoutbuf<char>) static char __cerr[sizeof(__stdoutbuf<char>)];
static mbstate_t mb_cerr;

#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
_ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wcerr[sizeof(wostream)]
#if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
__asm__("?wcerr@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
#endif
;
_ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcerr[sizeof(__stdoutbuf<wchar_t>)];
static mbstate_t mb_wcerr;
#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS

_ALIGNAS_TYPE (ostream) _LIBCPP_FUNC_VIS char clog[sizeof(ostream)]
#if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
__asm__("?clog@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
#endif
;

#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
_ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wclog[sizeof(wostream)]
#if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
__asm__("?wclog@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
#endif
;
#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS

// Pretend we're inside a system header so the compiler doesn't flag the use of the init_priority
// attribute with a value that's reserved for the implementation (we're the implementation).
#include "iostream_init.h"

// On Windows the TLS storage for locales needs to be initialized before we create
// the standard streams, otherwise it may not be alive during program termination
// when we flush the streams.
static void force_locale_initialization() {
#if defined(_LIBCPP_MSVCRT_LIKE)
  static bool once = []() {
    auto loc = newlocale(LC_ALL_MASK, "C", 0);
    {
        __libcpp_locale_guard g(loc); // forces initialization of locale TLS
        ((void)g);
    }
    freelocale(loc);
    return true;
  }();
  ((void)once);
#endif
}

class DoIOSInit {
public:
	DoIOSInit();
	~DoIOSInit();
};

DoIOSInit::DoIOSInit()
{
    force_locale_initialization();

    istream* cin_ptr  = ::new(cin)  istream(::new(__cin)  __stdinbuf <char>(stdin, &mb_cin));
    ostream* cout_ptr = ::new(cout) ostream(::new(__cout) __stdoutbuf<char>(stdout, &mb_cout));
    ostream* cerr_ptr = ::new(cerr) ostream(::new(__cerr) __stdoutbuf<char>(stderr, &mb_cerr));
                        ::new(clog) ostream(cerr_ptr->rdbuf());
    cin_ptr->tie(cout_ptr);
    _VSTD::unitbuf(*cerr_ptr);
    cerr_ptr->tie(cout_ptr);

#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
    wistream* wcin_ptr  = ::new(wcin)  wistream(::new(__wcin)  __stdinbuf <wchar_t>(stdin, &mb_wcin));
    wostream* wcout_ptr = ::new(wcout) wostream(::new(__wcout) __stdoutbuf<wchar_t>(stdout, &mb_wcout));
    wostream* wcerr_ptr = ::new(wcerr) wostream(::new(__wcerr) __stdoutbuf<wchar_t>(stderr, &mb_wcerr));
                          ::new(wclog) wostream(wcerr_ptr->rdbuf());

    wcin_ptr->tie(wcout_ptr);
    _VSTD::unitbuf(*wcerr_ptr);
    wcerr_ptr->tie(wcout_ptr);
#endif
}

DoIOSInit::~DoIOSInit()
{
    ostream* cout_ptr = reinterpret_cast<ostream*>(cout);
    cout_ptr->flush();
    ostream* clog_ptr = reinterpret_cast<ostream*>(clog);
    clog_ptr->flush();

#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
    wostream* wcout_ptr = reinterpret_cast<wostream*>(wcout);
    wcout_ptr->flush();
    wostream* wclog_ptr = reinterpret_cast<wostream*>(wclog);
    wclog_ptr->flush();
#endif
}

ios_base::Init::Init()
{
    static DoIOSInit init_the_streams; // gets initialized once
}

ios_base::Init::~Init()
{
}

_LIBCPP_END_NAMESPACE_STD