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 <__locale>
10 #include "std_stream.h"
11 #include <new>
12 #include <string>
13 
14 #ifdef _LIBCPP_MSVCRT_LIKE
15 #  include <__locale_dir/locale_base_api/locale_guard.h>
16 #endif
17 
18 #define _str(s) #s
19 #define str(s) _str(s)
20 #define _LIBCPP_ABI_NAMESPACE_STR str(_LIBCPP_ABI_NAMESPACE)
21 
22 _LIBCPP_BEGIN_NAMESPACE_STD
23 
24 _ALIGNAS_TYPE (istream) _LIBCPP_EXPORTED_FROM_ABI char cin[sizeof(istream)]
25 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
26 __asm__("?cin@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_istream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
27 #endif
28 ;
29 _ALIGNAS_TYPE (__stdinbuf<char> ) static char __cin[sizeof(__stdinbuf <char>)];
30 static mbstate_t mb_cin;
31 
32 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
33 _ALIGNAS_TYPE (wistream) _LIBCPP_EXPORTED_FROM_ABI char wcin[sizeof(wistream)]
34 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
35 __asm__("?wcin@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_istream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
36 #endif
37 ;
38 _ALIGNAS_TYPE (__stdinbuf<wchar_t> ) static char __wcin[sizeof(__stdinbuf <wchar_t>)];
39 static mbstate_t mb_wcin;
40 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
41 
42 _ALIGNAS_TYPE (ostream) _LIBCPP_EXPORTED_FROM_ABI char cout[sizeof(ostream)]
43 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
44 __asm__("?cout@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
45 #endif
46 ;
47 _ALIGNAS_TYPE (__stdoutbuf<char>) static char __cout[sizeof(__stdoutbuf<char>)];
48 static mbstate_t mb_cout;
49 
50 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
51 _ALIGNAS_TYPE (wostream) _LIBCPP_EXPORTED_FROM_ABI char wcout[sizeof(wostream)]
52 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
53 __asm__("?wcout@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
54 #endif
55 ;
56 _ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcout[sizeof(__stdoutbuf<wchar_t>)];
57 static mbstate_t mb_wcout;
58 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
59 
60 _ALIGNAS_TYPE (ostream) _LIBCPP_EXPORTED_FROM_ABI char cerr[sizeof(ostream)]
61 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
62 __asm__("?cerr@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
63 #endif
64 ;
65 _ALIGNAS_TYPE (__stdoutbuf<char>) static char __cerr[sizeof(__stdoutbuf<char>)];
66 static mbstate_t mb_cerr;
67 
68 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
69 _ALIGNAS_TYPE (wostream) _LIBCPP_EXPORTED_FROM_ABI char wcerr[sizeof(wostream)]
70 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
71 __asm__("?wcerr@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
72 #endif
73 ;
74 _ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcerr[sizeof(__stdoutbuf<wchar_t>)];
75 static mbstate_t mb_wcerr;
76 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
77 
78 _ALIGNAS_TYPE (ostream) _LIBCPP_EXPORTED_FROM_ABI char clog[sizeof(ostream)]
79 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
80 __asm__("?clog@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@DU?$char_traits@D@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
81 #endif
82 ;
83 
84 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
85 _ALIGNAS_TYPE (wostream) _LIBCPP_EXPORTED_FROM_ABI char wclog[sizeof(wostream)]
86 #if defined(_LIBCPP_ABI_MICROSOFT) && defined(__clang__)
87 __asm__("?wclog@" _LIBCPP_ABI_NAMESPACE_STR "@std@@3V?$basic_ostream@_WU?$char_traits@_W@" _LIBCPP_ABI_NAMESPACE_STR "@std@@@12@A")
88 #endif
89 ;
90 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
91 
92 // Pretend we're inside a system header so the compiler doesn't flag the use of the init_priority
93 // attribute with a value that's reserved for the implementation (we're the implementation).
94 #include "iostream_init.h"
95 
96 // On Windows the TLS storage for locales needs to be initialized before we create
97 // the standard streams, otherwise it may not be alive during program termination
98 // when we flush the streams.
99 static void force_locale_initialization() {
100 #if defined(_LIBCPP_MSVCRT_LIKE)
101   static bool once = []() {
102     auto loc = newlocale(LC_ALL_MASK, "C", 0);
103     {
104         __libcpp_locale_guard g(loc); // forces initialization of locale TLS
105         ((void)g);
106     }
107     freelocale(loc);
108     return true;
109   }();
110   ((void)once);
111 #endif
112 }
113 
114 class DoIOSInit {
115 public:
116     DoIOSInit();
117     ~DoIOSInit();
118 };
119 
120 DoIOSInit::DoIOSInit()
121 {
122     force_locale_initialization();
123 
124     istream* cin_ptr  = ::new(cin)  istream(::new(__cin)  __stdinbuf <char>(stdin, &mb_cin));
125     ostream* cout_ptr = ::new(cout) ostream(::new(__cout) __stdoutbuf<char>(stdout, &mb_cout));
126     ostream* cerr_ptr = ::new(cerr) ostream(::new(__cerr) __stdoutbuf<char>(stderr, &mb_cerr));
127                         ::new(clog) ostream(cerr_ptr->rdbuf());
128     cin_ptr->tie(cout_ptr);
129     _VSTD::unitbuf(*cerr_ptr);
130     cerr_ptr->tie(cout_ptr);
131 
132 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
133     wistream* wcin_ptr  = ::new(wcin)  wistream(::new(__wcin)  __stdinbuf <wchar_t>(stdin, &mb_wcin));
134     wostream* wcout_ptr = ::new(wcout) wostream(::new(__wcout) __stdoutbuf<wchar_t>(stdout, &mb_wcout));
135     wostream* wcerr_ptr = ::new(wcerr) wostream(::new(__wcerr) __stdoutbuf<wchar_t>(stderr, &mb_wcerr));
136                           ::new(wclog) wostream(wcerr_ptr->rdbuf());
137 
138     wcin_ptr->tie(wcout_ptr);
139     _VSTD::unitbuf(*wcerr_ptr);
140     wcerr_ptr->tie(wcout_ptr);
141 #endif
142 }
143 
144 DoIOSInit::~DoIOSInit()
145 {
146     ostream* cout_ptr = reinterpret_cast<ostream*>(cout);
147     cout_ptr->flush();
148     ostream* clog_ptr = reinterpret_cast<ostream*>(clog);
149     clog_ptr->flush();
150 
151 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
152     wostream* wcout_ptr = reinterpret_cast<wostream*>(wcout);
153     wcout_ptr->flush();
154     wostream* wclog_ptr = reinterpret_cast<wostream*>(wclog);
155     wclog_ptr->flush();
156 #endif
157 }
158 
159 ios_base::Init::Init()
160 {
161     static DoIOSInit init_the_streams; // gets initialized once
162 }
163 
164 ios_base::Init::~Init()
165 {
166 }
167 
168 _LIBCPP_END_NAMESPACE_STD
169