156ab87500
See: * https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319 * https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701 We're dropping support for C++03 for Zig due to the first change; it would be insane to ship 1018 duplicate header files just for this outdated use case. As a result of the second change, I had to bring in a subset of the headers from llvm-libc since libc++ now depends on these. Hopefully we can continue to get away with not copying the entirety of llvm-libc.
71 lines
2.8 KiB
C++
Vendored
71 lines
2.8 KiB
C++
Vendored
//===----------------------------------------------------------------------===//
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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___UTILITY_IS_POINTER_IN_RANGE_H
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#define _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H
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#include <__algorithm/comp.h>
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#include <__assert>
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#include <__config>
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#include <__type_traits/enable_if.h>
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#include <__type_traits/integral_constant.h>
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#include <__type_traits/is_constant_evaluated.h>
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#include <__type_traits/void_t.h>
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#include <__utility/declval.h>
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#include <__utility/is_valid_range.h>
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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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template <class _Tp, class _Up, class = void>
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struct __is_less_than_comparable : false_type {};
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template <class _Tp, class _Up>
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struct __is_less_than_comparable<_Tp, _Up, __void_t<decltype(std::declval<_Tp>() < std::declval<_Up>())> > : true_type {
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};
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template <class _Tp, class _Up, __enable_if_t<__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0>
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_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool
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__is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) {
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_LIBCPP_ASSERT_VALID_INPUT_RANGE(std::__is_valid_range(__begin, __end), "[__begin, __end) is not a valid range");
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if (__libcpp_is_constant_evaluated()) {
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// If this is not a constant during constant evaluation we know that __ptr is not part of the allocation where
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// [__begin, __end) is.
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if (!__builtin_constant_p(__begin <= __ptr && __ptr < __end))
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return false;
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}
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return !__less<>()(__ptr, __begin) && __less<>()(__ptr, __end);
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}
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template <class _Tp, class _Up, __enable_if_t<!__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0>
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_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool
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__is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) {
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if (__libcpp_is_constant_evaluated())
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return false;
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return reinterpret_cast<const char*>(__begin) <= reinterpret_cast<const char*>(__ptr) &&
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reinterpret_cast<const char*>(__ptr) < reinterpret_cast<const char*>(__end);
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}
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template <class _Tp, class _Up>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
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__is_overlapping_range(const _Tp* __begin, const _Tp* __end, const _Up* __begin2) {
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auto __size = __end - __begin;
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auto __end2 = __begin2 + __size;
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return std::__is_pointer_in_range(__begin, __end, __begin2) || std::__is_pointer_in_range(__begin2, __end2, __begin);
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H
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