vvmd
stable_deref_trait
| vvmd | stable_deref_trait | |
|---|---|---|
| 1 | 4 | |
| - | 29 | |
| - | - | |
| - | 1.2 | |
| - | about 1 year ago | |
| Rust | ||
| - | Apache License 2.0 |
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vvmd
stable_deref_trait
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Build a PinePhone App with Zig and Zgt
To elaborate, there is a recurring trend of sound C programs turning into unsound Rust programs, because shared mutability is often necessary but Stacked Borrows places strict conditions on constructing &mut T (they invalidate some but not all aliasing *const T), and it's less ergonomic to work solely in raw pointers and avoid creating Box or long-lasting &mut T (or for intrusive collections, any &mut T at all).
For example, matklad (the author of rust-analyzer, one of the preeminent Rust programmers and someone I'd expect to get code right) made a recent blog post on "Caches In Rust" (https://matklad.github.io/2022/06/11/caches-in-rust.html). The cache is built around https://docs.rs/elsa, which is built around https://docs.rs/stable_deref_trait/latest/stable_deref_trait..., which is unsound for Box and violates stacked borrows in its current form (https://github.com/Storyyeller/stable_deref_trait/issues/15). However, the rules may be relaxed or more ergonomic alternatives added (https://github.com/rust-lang/unsafe-code-guidelines/issues/3...), it's uncertain right now.
(Also I go by "they".)
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How Safe Is Zig?
Unsafe Rust is an esoteric language without iron-clad guarantees, and type-level programming and async Rust is an esoteric metalanguage (https://hirrolot.github.io/posts/rust-is-hard-or-the-misery-...). For example, matklad made a recent blog post on "Caches In Rust" (https://matklad.github.io/2022/06/11/caches-in-rust.html). The cache is built around https://docs.rs/elsa, which is built around https://docs.rs/stable_deref_trait/latest/stable_deref_trait..., which is unsound for Box and violates stacked borrows: https://github.com/Storyyeller/stable_deref_trait/issues/15
There is a recurring trend of sound C programs turning into unsound Rust programs, because shared mutability is often necessary but it's difficult to avoid creating &mut, and Stacked Borrows places strict conditions on constructing &mut T (they invalidate some but not all aliasing *const T).
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Blog Post: Caches In Rust
The cache is built around https://docs.rs/elsa, which is built around https://docs.rs/stable_deref_trait/latest/stable_deref_trait/trait.StableDeref.html, which is unsound for Box and violates stacked borrows: https://github.com/Storyyeller/stable_deref_trait/issues/15
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munge 0.2: Destructure raw pointers, MaybeUninit, cells, pins, and more
StableDeref has multiple issues under the current Stacked Borrows model: https://github.com/Storyyeller/stable_deref_trait/issues/15
What are some alternatives?
mmsd
phosh-antispam
zorrow - Borrowchecker in Zig
vvmplayer
lru-rs - An implementation of a LRU cache
unsafe-code-guidelines - Forum for discussion about what unsafe code can and can't do
munge
zig - General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
pure - A static analysis file format checker.