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ba87515fea
Currently, the library-internal feature test macros are only defined if the feature is not available, and always have the prefix `_LIBCPP_HAS_NO_`. This patch changes that, so that they are always defined and have the prefix `_LIBCPP_HAS_` instead. This changes the canonical use of these macros to `#if _LIBCPP_HAS_FEATURE`, which means that using an undefined macro (e.g. due to a missing include) is diagnosed now. While this is rather unlikely currently, a similar change in `<__configuration/availability.h>` caught a few bugs. This also improves readability, since it removes the double-negation of `#ifndef _LIBCPP_HAS_NO_FEATURE`. The current patch only touches the macros defined in `<__config>`. If people are happy with this approach, I'll make a follow-up PR to also change the macros defined in `<__config_site>`.
105 lines
3.9 KiB
C++
105 lines
3.9 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___LIBCXX_DEBUG_UTILS_SANITIZERS_H
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#define _LIBCPP___LIBCXX_DEBUG_UTILS_SANITIZERS_H
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#include <__config>
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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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#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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#if _LIBCPP_HAS_ASAN
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extern "C" {
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_LIBCPP_EXPORTED_FROM_ABI void
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__sanitizer_annotate_contiguous_container(const void*, const void*, const void*, const void*);
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_LIBCPP_EXPORTED_FROM_ABI void __sanitizer_annotate_double_ended_contiguous_container(
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const void*, const void*, const void*, const void*, const void*, const void*);
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_LIBCPP_EXPORTED_FROM_ABI int
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__sanitizer_verify_double_ended_contiguous_container(const void*, const void*, const void*, const void*);
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}
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#endif // _LIBCPP_HAS_ASAN
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_LIBCPP_BEGIN_NAMESPACE_STD
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// ASan choices
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#if _LIBCPP_HAS_ASAN
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# define _LIBCPP_HAS_ASAN_CONTAINER_ANNOTATIONS_FOR_ALL_ALLOCATORS 1
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#endif
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#ifdef _LIBCPP_HAS_ASAN_CONTAINER_ANNOTATIONS_FOR_ALL_ALLOCATORS
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// __asan_annotate_container_with_allocator determines whether containers with custom allocators are annotated. This is
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// a public customization point to disable annotations if the custom allocator assumes that the memory isn't poisoned.
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// See the https://libcxx.llvm.org/UsingLibcxx.html#turning-off-asan-annotation-in-containers for more information.
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template <class _Alloc>
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struct __asan_annotate_container_with_allocator : true_type {};
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#endif
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// Annotate a double-ended contiguous range.
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// - [__first_storage, __last_storage) is the allocated memory region,
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// - [__first_old_contained, __last_old_contained) is the previously allowed (unpoisoned) range, and
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// - [__first_new_contained, __last_new_contained) is the new allowed (unpoisoned) range.
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template <class _Allocator>
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_LIBCPP_HIDE_FROM_ABI void __annotate_double_ended_contiguous_container(
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const void* __first_storage,
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const void* __last_storage,
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const void* __first_old_contained,
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const void* __last_old_contained,
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const void* __first_new_contained,
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const void* __last_new_contained) {
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#if !_LIBCPP_HAS_ASAN
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(void)__first_storage;
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(void)__last_storage;
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(void)__first_old_contained;
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(void)__last_old_contained;
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(void)__first_new_contained;
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(void)__last_new_contained;
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#else
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if (__asan_annotate_container_with_allocator<_Allocator>::value && __first_storage != nullptr)
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__sanitizer_annotate_double_ended_contiguous_container(
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__first_storage,
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__last_storage,
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__first_old_contained,
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__last_old_contained,
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__first_new_contained,
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__last_new_contained);
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#endif
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}
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// Annotate a contiguous range.
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// [__first_storage, __last_storage) is the allocated memory region,
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// __old_last_contained is the previously last allowed (unpoisoned) element, and
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// __new_last_contained is the new last allowed (unpoisoned) element.
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template <class _Allocator>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __annotate_contiguous_container(
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const void* __first_storage,
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const void* __last_storage,
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const void* __old_last_contained,
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const void* __new_last_contained) {
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#if !_LIBCPP_HAS_ASAN
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(void)__first_storage;
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(void)__last_storage;
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(void)__old_last_contained;
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(void)__new_last_contained;
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#else
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if (!__libcpp_is_constant_evaluated() && __asan_annotate_container_with_allocator<_Allocator>::value &&
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__first_storage != nullptr)
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__sanitizer_annotate_contiguous_container(
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__first_storage, __last_storage, __old_last_contained, __new_last_contained);
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#endif
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___LIBCXX_DEBUG_UTILS_SANITIZERS_H
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