49e7be2e5b
This patch gets rid of technical debt around std::pointer_safety which, I claim, is entirely unnecessary. I don't think anybody has used std::pointer_safety in actual code because we do not implement the underlying garbage collection support. In fact, P2186 even proposes removing these facilities entirely from a future C++ version. As such, I think it's entirely fine to get rid of complex workarounds whose goals were to avoid breaking the ABI back in 2017. I'm putting this up both to get reviews and to discuss this proposal for a breaking change. I think we should be comfortable with making these tiny breaks if we are confident they won't hurt anyone, which I'm fairly confident is the case here. Differential Revision: https://reviews.llvm.org/D100410
57 lines
1.4 KiB
C++
57 lines
1.4 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___MEMORY_POINTER_SAFETY_H
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#define _LIBCPP___MEMORY_POINTER_SAFETY_H
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#include <__config>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if !defined(_LIBCPP_CXX03_LANG)
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enum class pointer_safety : unsigned char {
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relaxed,
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preferred,
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strict
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};
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inline _LIBCPP_INLINE_VISIBILITY
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pointer_safety get_pointer_safety() _NOEXCEPT {
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return pointer_safety::relaxed;
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}
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_LIBCPP_FUNC_VIS void declare_reachable(void* __p);
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_LIBCPP_FUNC_VIS void declare_no_pointers(char* __p, size_t __n);
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_LIBCPP_FUNC_VIS void undeclare_no_pointers(char* __p, size_t __n);
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_LIBCPP_FUNC_VIS void* __undeclare_reachable(void* __p);
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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_Tp*
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undeclare_reachable(_Tp* __p)
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{
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return static_cast<_Tp*>(__undeclare_reachable(__p));
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}
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#endif // !C++03
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___MEMORY_POINTER_SAFETY_H
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