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# Objective Improve safety testing when using `bevy_ptr` types. This is a follow-up to #7113. ## Solution Add a debug-only assertion that pointers are aligned when casting to a concrete type. This should very quickly catch any unsoundness from unaligned pointers, even without miri. However, this can have a large negative perf impact on debug builds. --- ## Changelog Added: `Ptr::deref` will now panic in debug builds if the pointer is not aligned. Added: `PtrMut::deref_mut` will now panic in debug builds if the pointer is not aligned. Added: `OwningPtr::read` will now panic in debug builds if the pointer is not aligned. Added: `OwningPtr::drop_as` will now panic in debug builds if the pointer is not aligned. |
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bevy_ptr
The bevy_ptr crate provides low-level abstractions for working with pointers in a more safe way than using rust's raw pointers.
Rust has lifetimed and typed references (&'a T), unlifetimed and typed references (*const T), but no lifetimed but untyped references.
bevy_ptr adds them, called Ptr<'a>, PtrMut<'a> and OwningPtr<'a>.
These types are lifetime-checked so can never lead to problems like use-after-frees and must always point to valid data.