a68147f0f0
This makes printing `thread::id` faster, since we avoid a bunch of boilerplate code that isn't optimized away. It also avoids including `<sstream>` and `<__locale>`, cutting the time to parse `<thread>` in half. This also changes the output when printing the id on a platform that uses a pointer as the underlying type. I don't think that's a problem, since the thread id isn't in any way stable. It also makes the output consistent across all platforms we support.
73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___THREAD_FORMATTER_H
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#define _LIBCPP___THREAD_FORMATTER_H
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#include <__concepts/arithmetic.h>
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#include <__config>
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#include <__format/concepts.h>
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#include <__format/format_parse_context.h>
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#include <__format/formatter.h>
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#include <__format/formatter_integral.h>
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#include <__format/parser_std_format_spec.h>
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#include <__thread/id.h>
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#include <__type_traits/conditional.h>
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#include <__type_traits/is_pointer.h>
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#include <__type_traits/is_same.h>
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#include <cstdint>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if _LIBCPP_STD_VER >= 23
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_LIBCPP_BEGIN_NAMESPACE_STD
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# if _LIBCPP_HAS_THREADS
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template <__fmt_char_type _CharT>
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struct formatter<__thread_id, _CharT> {
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public:
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template <class _ParseContext>
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_LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __ctx) {
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return __parser_.__parse(__ctx, __format_spec::__fields_fill_align_width);
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}
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template <class _FormatContext>
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_LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator format(__thread_id __id, _FormatContext& __ctx) const {
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// In __thread/support/pthread.h, __libcpp_thread_id is either a
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// unsigned long long or a pthread_t.
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//
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// The type of pthread_t is left unspecified in POSIX so it can be any
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// type. The most logical types are an integral or pointer.
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// On Linux systems pthread_t is an unsigned long long.
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// On Apple systems pthread_t is a pointer type.
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//
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// Note the output should match what the stream operator does.
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using _Tp = decltype(__get_underlying_id(__id));
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using _Cp = conditional_t<integral<_Tp>, _Tp, conditional_t<is_pointer_v<_Tp>, uintptr_t, void>>;
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static_assert(!is_same_v<_Cp, void>, "unsupported thread::id type, please file a bug report");
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__format_spec::__parsed_specifications<_CharT> __specs = __parser_.__get_parsed_std_specifications(__ctx);
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return __formatter::__format_integer(reinterpret_cast<_Cp>(__get_underlying_id(__id)), __ctx, __specs);
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}
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__format_spec::__parser<_CharT> __parser_{.__alignment_ = __format_spec::__alignment::__right};
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};
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# endif // _LIBCPP_HAS_THREADS
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 23
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#endif // _LIBCPP___THREAD_FORMATTER_H
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