apply fix for UBSan "object-size" errors#1
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Running tests with clang-16 and the undefined behavior sanitizer (UBSan)
produces errors such as the following in the immer library:
```
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior 3rdParty/immer/immer/detail/hamts/node.hpp:224:26 in
3rdParty/immer/immer/detail/hamts/node.hpp:229:12: runtime error: member access within address 0x60300009a570 with insufficient space for an object of type 'node_t' (aka 'immer::detail::hamts::node<std::pair<std::basic_string<char>, std::shared_ptr<const arangodb::consensus::Node>>, immer::map<std::basic_string<char>, std::shared_ptr<const arangodb::consensus::Node>, arangodb::consensus::Node::TransparentHash, arangodb::consensus::Node::TransparentEqual, immer::memory_policy<arangodb::consensus::Node::AccountingHeap<arangodb::immer::thread_local_free_list_heap_policy<immer::cpp_heap>>, immer::refcount_policy, immer::spinlock_policy, immer::no_transience_policy, false, true>>::hash_key, immer::map<std::basic_string<char>, std::shared_ptr<const arangodb::consensus::Node>, arangodb::consensus::Node::TransparentHash, arangodb::consensus::Node::TransparentEqual, immer::memory_policy<arangodb::consensus::Node::AccountingHeap<arangodb::immer::thread_local_free_list_heap_policy<immer::cpp_heap>>, immer::refcount_policy, immer::spinlock_policy, immer::no_transience_policy, false, true>>::equal_key, immer::memory_policy<arangodb::consensus::Node::AccountingHeap<arangodb::immer::thread_local_free_list_heap_policy<immer::cpp_heap>>, immer::refcount_policy, immer::spinlock_policy, immer::no_transience_policy, false, true>, 5>')
0x60300009a570: note: pointer points here
00 00 00 00 01 00 00 00 be be be be be be be be be be be be be be be be be be be be 00 00 00 00
^
```
the issue was reported to the upstream version of immer via
arximboldi#274.
the fix for the particular issue was written by @maierlars.
maierlars
approved these changes
Jan 16, 2024
Member
|
According to arximboldi#274 (comment), this should be a false positive. So we could also add a suppression. @jsteemann But I'd be fine with this change as well, if you prefer it. |
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Running tests with clang-16 and the undefined behavior sanitizer (UBSan) produces errors such as the following in the immer library:
the issue was reported to the upstream version of immer via arximboldi#274.
the fix for the particular issue was written by @maierlars.