a06073f91e
In the future, this utility could be made to also work with iterators, including bounded iterators. We could also query the ASAN runtime for this information when it's around.
63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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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 __is_pointer_in_range(
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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 __is_pointer_in_range(
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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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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H
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