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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-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___THREAD_FORMATTER_H11#define _LIBCPP___THREAD_FORMATTER_H12 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_header28#endif29 30#if _LIBCPP_STD_VER >= 2331 32_LIBCPP_BEGIN_NAMESPACE_STD33 34# if _LIBCPP_HAS_THREADS35 36template <__fmt_char_type _CharT>37struct formatter<__thread_id, _CharT> {38public: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 __thread/support/pthread.h, __libcpp_thread_id is either a47 // unsigned long long or a pthread_t.48 //49 // The type of pthread_t is left unspecified in POSIX so it can be any50 // 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. Since55 // the ostream operator has been shipped years before this formatter56 // was added to the Standard, this formatter does what the stream57 // 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_THREADS75 76_LIBCPP_END_NAMESPACE_STD77 78#endif // _LIBCPP_STD_VER >= 2379 80#endif // _LIBCPP___THREAD_FORMATTER_H81