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authorAdvenam Tacet <advenam.tacet@trailofbits.com>2023-05-04 14:16:06 -0700
committerNikolas Klauser <n_klauser@apple.com>2023-05-04 14:17:25 -0700
commit2fa1bec7a20bb23f2e6620085adb257dafaa3be0 (patch)
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parentbfbe137888151dfd506df6b3319d08c4de0e00f5 (diff)
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[ASan][libcxx] A way to turn off annotations for containers with a specific allocator
This revision is part of our efforts to support container annotations with (almost) every allocator. That patch is necessary to enable support for most annotations (D136765). Without a way to turn off annotations, it's hard to use ASan with area allocators (no calls to destructors). This is an answer to a request about it. This patch provides a solution to the aforementioned issue by introducing a new template structure `__asan_annotate_container_with_allocator`, which allows the disabling of container annotations for a specific allocator. This patch also introduces `_LIBCPP_HAS_ASAN_CONTAINER_ANNOTATIONS_FOR_ALL_ALLOCATORS` FTM. To turn off annotations, it is sufficient to create a template specialization with a false value using a [Unary Type Trait](https://en.cppreference.com/w/cpp/types/integral_constant). The proposed structure is being used in the code enabling annotations for all allocators in `std::vector`, `std::basic_string`, and `std::deque`. (D136765 D146214 D146815) Possibility to do it was added to ASan API in rGdd1b7b797a116eed588fd752fbe61d34deeb24e4 commit. For context on not calling a destructor, look at https://eel.is/c++draft/basic.life#5 and notes there, you may also read a discussion in D136765. Reviewed By: ldionne, philnik, #libc, hans Spies: EricWF, mikhail.ramalho, #sanitizers, libcxx-commits, hans, vitalybuka Differential Revision: https://reviews.llvm.org/D145628
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