1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___THREAD_FORMATTER_H 11 #define _LIBCPP___THREAD_FORMATTER_H 12 13 #include <__concepts/arithmetic.h> 14 #include <__config> 15 #include <__format/concepts.h> 16 #include <__format/format_parse_context.h> 17 #include <__format/formatter.h> 18 #include <__format/formatter_integral.h> 19 #include <__format/parser_std_format_spec.h> 20 #include <__thread/id.h> 21 #include <__type_traits/conditional.h> 22 #include <__type_traits/is_pointer.h> 23 #include <__type_traits/is_same.h> 24 #include <cstdint> 25 26 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 27 # pragma GCC system_header 28 #endif 29 30 #if _LIBCPP_STD_VER >= 23 31 32 _LIBCPP_BEGIN_NAMESPACE_STD 33 34 # ifndef _LIBCPP_HAS_NO_THREADS 35 36 template <__fmt_char_type _CharT> 37 struct _LIBCPP_TEMPLATE_VIS formatter<__thread_id, _CharT> { 38 public: 39 template <class _ParseContext> 40 _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __ctx) { 41 return __parser_.__parse(__ctx, __format_spec::__fields_fill_align_width); 42 } 43 44 template <class _FormatContext> 45 _LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator format(__thread_id __id, _FormatContext& __ctx) const { 46 // In __threading_support __libcpp_thread_id is either a 47 // unsigned long long or a pthread_t. 48 // 49 // The type of pthread_t is left unspecified in POSIX so it can be any 50 // type. The most logical types are an integral or pointer. 51 // On Linux systems pthread_t is an unsigned long long. 52 // On Apple systems pthread_t is a pointer type. 53 // 54 // Note the output should match what the stream operator does. Since 55 // the ostream operator has been shipped years before this formatter 56 // was added to the Standard, this formatter does what the stream 57 // operator does. This may require platform specific changes. 58 59 using _Tp = decltype(__get_underlying_id(__id)); 60 using _Cp = conditional_t<integral<_Tp>, _Tp, conditional_t<is_pointer_v<_Tp>, uintptr_t, void>>; 61 static_assert(!is_same_v<_Cp, void>, "unsupported thread::id type, please file a bug report"); 62 63 __format_spec::__parsed_specifications<_CharT> __specs = __parser_.__get_parsed_std_specifications(__ctx); 64 if constexpr (is_pointer_v<_Tp>) { 65 __specs.__std_.__alternate_form_ = true; 66 __specs.__std_.__type_ = __format_spec::__type::__hexadecimal_lower_case; 67 } 68 return __formatter::__format_integer(reinterpret_cast<_Cp>(__get_underlying_id(__id)), __ctx, __specs); 69 } 70 71 __format_spec::__parser<_CharT> __parser_{.__alignment_ = __format_spec::__alignment::__right}; 72 }; 73 74 # endif // !_LIBCPP_HAS_NO_THREADS 75 76 _LIBCPP_END_NAMESPACE_STD 77 78 #endif // _LIBCPP_STD_VER >= 23 79 80 #endif // _LIBCPP___THREAD_FORMATTER_H 81