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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___CXX03___UTILITY_IS_POINTER_IN_RANGE_H |
| 10 | #define _LIBCPP___CXX03___UTILITY_IS_POINTER_IN_RANGE_H |
| 11 | |
| 12 | #include <__cxx03/__algorithm/comp.h> |
| 13 | #include <__cxx03/__assert> |
| 14 | #include <__cxx03/__config> |
| 15 | #include <__cxx03/__type_traits/enable_if.h> |
| 16 | #include <__cxx03/__type_traits/integral_constant.h> |
| 17 | #include <__cxx03/__type_traits/is_constant_evaluated.h> |
| 18 | #include <__cxx03/__type_traits/void_t.h> |
| 19 | #include <__cxx03/__utility/declval.h> |
| 20 | #include <__cxx03/__utility/is_valid_range.h> |
| 21 | |
| 22 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 23 | # pragma GCC system_header |
| 24 | #endif |
| 25 | |
| 26 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 27 | |
| 28 | template <class _Tp, class _Up, class = void> |
| 29 | struct __is_less_than_comparable : false_type {}; |
| 30 | |
| 31 | template <class _Tp, class _Up> |
| 32 | struct __is_less_than_comparable<_Tp, _Up, __void_t<decltype(std::declval<_Tp>() < std::declval<_Up>())> > : true_type { |
| 33 | }; |
| 34 | |
| 35 | template <class _Tp, class _Up, __enable_if_t<__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0> |
| 36 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool |
| 37 | __is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) { |
| 38 | _LIBCPP_ASSERT_VALID_INPUT_RANGE(std::__is_valid_range(__begin, __end), "[__begin, __end) is not a valid range"); |
| 39 | |
| 40 | if (__libcpp_is_constant_evaluated()) { |
| 41 | // If this is not a constant during constant evaluation we know that __ptr is not part of the allocation where |
| 42 | // [__begin, __end) is. |
| 43 | if (!__builtin_constant_p(__begin <= __ptr && __ptr < __end)) |
| 44 | return false; |
| 45 | } |
| 46 | |
| 47 | return !__less<>()(__ptr, __begin) && __less<>()(__ptr, __end); |
| 48 | } |
| 49 | |
| 50 | template <class _Tp, class _Up, __enable_if_t<!__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0> |
| 51 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool |
| 52 | __is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) { |
| 53 | if (__libcpp_is_constant_evaluated()) |
| 54 | return false; |
| 55 | |
| 56 | return reinterpret_cast<const char*>(__begin) <= reinterpret_cast<const char*>(__ptr) && |
| 57 | reinterpret_cast<const char*>(__ptr) < reinterpret_cast<const char*>(__end); |
| 58 | } |
| 59 | |
| 60 | _LIBCPP_END_NAMESPACE_STD |
| 61 | |
| 62 | #endif // _LIBCPP___CXX03___UTILITY_IS_POINTER_IN_RANGE_H |
| 63 |
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