no-panic
rust-by-example
no-panic | rust-by-example | |
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12 | 66 | |
515 | 6,738 | |
- | 1.4% | |
4.2 | 8.5 | |
about 2 years ago | 10 days ago | |
Rust | Handlebars | |
GNU General Public License v3.0 or later | Apache License 2.0 |
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no-panic
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no_panic causing errors in hello world?
I discovered a crate called no_panic that prevents a function from compiling, unless the compiler can proof that this function can't panic.
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Is there something like "super-safe" rust?
/u/dtolnay has a no-panic macro, I don't know its limitations but in older comments they note it pretty much has to be used in release mode, as there are lots of panic codepaths which get optimised out.
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Is Rust really safe? How to identify functions that can potentially cause panic
'Hacks' such as https://github.com/dtolnay/no-panic, https://crates.io/crates/no-panics-whatsoever that ensure any calls to panic handling will result in link errors. Not really reliable in terms of being able to abort instead, but a possible tool.
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US NGO Consumer Reports also reporting on C and C++ safety for product development.
nope. Unfortunately, no mainstream language has this yet. We need an Algebraic effects typesystem to do this properly. There are a few temporary band-aid solutions like https://github.com/dtolnay/no-panic
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Carefully exploring Rust as a Python developer
This kind of already exists in the form of #[no_panic] [1]?
> If the function does panic (or the compiler fails to prove that the function cannot panic), the program fails to compile with a linker error that identifies the function name.
1: https://github.com/dtolnay/no-panic
- What I like about rust
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LKML: Linus Torvalds: Re: [PATCH v9 12/27] rust: add `kernel` crate
I really think that Rust needs an official #[no_panic] macro that can validate these sort of things (like dtolnay’s crate, I’m not sure why it was archived)
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A pair of Linux kernel modules using Rust
Because it's convenient and familiar to most programmers. Not providing bounds-checked indexing makes some kinds of code very hard to write.
But note his problem also happens with integer division.
In Rust, a[x] on an array or vec is really a roughly a shortand for a.get(x).unwrap() (with a different error message)
Likewise, a / b on integers is a kind of a shortand for a.checked_div(b).unwrap()
The thing is, if the index ever is out of bounds, or if the denominator is zero, the program has a bug, 100% of time. And if you catch a bug using an assertion there is seldom anything better than interrupting the execution (the only thing I can think of is restarting the program or the subsystem). If you continue execution past a programming error, you may sometimes corrupt data structures or introduce bizarre, hard to debug situations.
Doing a pattern match on a.get(x) doesn't help because if it's ever None (and your program logic expects that x is in bounds) then you are kind of forced to bail.
The downside here is that we aren't catching this bug at compile time. And it's true that sometimes we can rewrite the program to not have an indexing operation, usually using iterators (eliding the bounds check will make the program run faster, too). But in general this is not possible, at least not without bringing formal methods. But that's what tests are for, to ensure the correctness of stuff type errors can't catch.
Now, there are some crates like https://github.com/dtolnay/no-panic or https://github.com/facebookexperimental/MIRAI that will check that your code is panic free. The first one is based on the fact that llvm optimizations can often remove dead code and thus remove the panic from a[x] or a / b - if it doesn't, then compilation fails. The second one employs formal methods to mathematically prove that there is no panic. I guess those techniques will eventually be ported to the kernel even if panics happen differently there (by hooking on the BUG mechanism or whatever)
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Redoing the runtime
Hmm, yeah as you mentioned, looks like a surprising amount of stuff is already done in the rust for the linux kernel project: https://github.com/Rust-for-Linux/linux/tree/rust/rust/. It's also MIT/Apache licensed, but I was expecting gpl, so I can actually use it. It's still a lot to trim down on, so might be easier to just build up as needed. Additionally I just saw /u/dtolnay's #[no_panic] attribute which at least makes it a compiler error if it's accidentally done.
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[PATCH 00/13] [RFC] Rust support
Obviously, in bare metal systems, in the kernel, etc, you always want to use the second style. In this patch series, the first type had been stubbed out to panic, but Linus doesn't want any chance of panicking, he wants it to be a compile time error if anyone tries to call these methods from within the kernel, for example by not providing the symbols and failing to link if someone did try to use them. There is already precedent for doing that in the Rust ecosystem, so it's planned to do that in this patch series, but the authors hadn't gotten to that yet.
rust-by-example
- Learning Rust for project.
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A Beginner’s Guide to the Solana Web3 Stack
Rust can feel a bit intimidating at first but once you start getting the hang of it, you will enjoy it a lot. It has a very well articulated documentation, which can be used as a good learning resource too. Some other resources for Rust include Rustlings and Rust-By-Example.
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Jumping into Rust for the first time. Is the interactive Rust textbook, published by the CS department at Brown University, a good starting point?
Rust by Example
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How to move to rust from c++?
Rust by Example: Collection of runnable examples, which many find useful to read
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Rust by Example: read lines - Why is the second example more efficient?
I think something went wrong there, I can find this (merged) PR with https://github.com/rust-lang/rust-by-example/pull/1679/files that has the first example collecting into a string, (which is obv less effective). It was merged 2 weeks ago. I dont know why it isnt online yet.
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Picking Up Rust Before C With My Goals In Mind?
I more or less went straight from The Book (see also Rust by Example) to Learning Rust With Entirely Too Many Linked Lists and code::dive conference 2014 - Scott Meyers: Cpu Caches and Why You Care and I've often seen PNGme suggested as the next step after that.
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How do I return a value from match construct?
Context around the "rust by example" discussion from 2015: https://github.com/rust-lang/rust-by-example/issues/390
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From High-Level to Systems Programming: A Practical Guide to Rust, Part 2
The Rust By Example website is another helpful resource for learning Rust. It provides a series of interactive examples that demonstrate how to use various Rust features and libraries.
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How to learn Rust (for backend) ?
The book is great and was my original introduction to the language, but rustlings or Rust By Example might be more interesting for an interactive (and more self paced) approach.
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Learning rust
Rust by Example: Rust by Example is a collection of runnable examples that cover a wide range of Rust concepts and standard libraries. It's a great way to see how Rust code works in practice.
What are some alternatives?
Rust-for-Linux - Adding support for the Rust language to the Linux kernel.
Rustlings - :crab: Small exercises to get you used to reading and writing Rust code!
rust - Empowering everyone to build reliable and efficient software.
book - The Rust Programming Language
gccrs - GCC Front-End for Rust
zero-to-production - Code for "Zero To Production In Rust", a book on API development using Rust.
rust - Rust language bindings for TensorFlow
monkey - Monkey patching in Go
rustc_codegen_gcc - libgccjit AOT codegen for rustc
RustBooks - List of Rust books
rfcs - RFCs for changes to Rust
easy_rust - Rust explained using easy English