368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
91 lines
3.4 KiB
C++
91 lines
3.4 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___FORMAT_FORMATTER_POINTER_H
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#define _LIBCPP___FORMAT_FORMATTER_POINTER_H
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#include <__algorithm/copy.h>
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#include <__assert>
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#include <__availability>
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#include <__config>
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#include <__format/format_error.h>
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#include <__format/format_fwd.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 <__iterator/access.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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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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// TODO FMT Remove this once we require compilers with proper C++20 support.
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// If the compiler has no concepts support, the format header will be disabled.
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// Without concepts support enable_if needs to be used and that too much effort
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// to support compilers with partial C++20 support.
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# if !defined(_LIBCPP_HAS_NO_CONCEPTS)
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namespace __format_spec {
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template <__formatter::__char_type _CharT>
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class _LIBCPP_TEMPLATE_VIS __formatter_pointer : public __parser_pointer<_CharT> {
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public:
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_LIBCPP_HIDE_FROM_ABI auto format(const void* __ptr, auto& __ctx) -> decltype(__ctx.out()) {
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_LIBCPP_ASSERT(this->__alignment != _Flags::_Alignment::__default,
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"The call to parse should have updated the alignment");
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if (this->__width_needs_substitution())
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this->__substitute_width_arg_id(__ctx.arg(this->__width));
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// This code looks a lot like the code to format a hexadecimal integral,
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// but that code isn't public. Making that code public requires some
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// refactoring.
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// TODO FMT Remove code duplication.
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char __buffer[2 + 2 * sizeof(uintptr_t)];
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__buffer[0] = '0';
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__buffer[1] = 'x';
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char* __last = __to_buffer(__buffer + 2, _VSTD::end(__buffer), reinterpret_cast<uintptr_t>(__ptr), 16);
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unsigned __size = __last - __buffer;
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if (__size >= this->__width)
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return _VSTD::copy(__buffer, __last, __ctx.out());
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return __formatter::__write(__ctx.out(), __buffer, __last, __size, this->__width, this->__fill, this->__alignment);
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}
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};
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} // namespace __format_spec
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// [format.formatter.spec]/2.4
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// For each charT, the pointer type specializations template<>
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// - struct formatter<nullptr_t, charT>;
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// - template<> struct formatter<void*, charT>;
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// - template<> struct formatter<const void*, charT>;
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template <__formatter::__char_type _CharT>
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struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<nullptr_t, _CharT>
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: public __format_spec::__formatter_pointer<_CharT> {};
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template <__formatter::__char_type _CharT>
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struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<void*, _CharT>
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: public __format_spec::__formatter_pointer<_CharT> {};
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template <__formatter::__char_type _CharT>
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struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const void*, _CharT>
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: public __format_spec::__formatter_pointer<_CharT> {};
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# endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
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#endif //_LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FORMAT_FORMATTER_POINTER_H
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