TOGVM-Spec
prusti-dev
TOGVM-Spec | prusti-dev | |
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2 | 23 | |
0 | 1,474 | |
- | 1.6% | |
4.4 | 8.5 | |
9 months ago | 7 days ago | |
PHP | Rust | |
- | GNU General Public License v3.0 or later |
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TOGVM-Spec
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The AST Typing Problem
Make each AST node an RDF node and then you can cram whatever information into it you want. That's the approach I've been taking with https://github.com/TOGoS/TOGVM-Spec/, anyway.
Of course, for conveniently and safely manipulating in memory in $programming_language, you're probably going to want to define some structs/ADTs/whatever that only contain the data a given compilation stage is actively working with.
I've been thinking that what I need is a system that allows me to quickly define different lower-level datatypes for representing different views of the conceptual types and automate, to some degree, translation between them, so then each part of the system can work with objects designed specifically to be processed by it with minimal fuss.
A technical reason for avoiding those specialized types might be that the computer then has to spend more time transforming from one schema to the next. I would think that in practice this isn't any worse than having to do a lot of null checks.
A more human reason is that it could bean a combinatorical explosion of AST types. I guess this is where my idea about lightweight variations comes in.
In TypeScript this kind of thing might not be so bad, since any object can be downcast with no cost to a type that contains a subset of the information, and variations on types can be easily defined without even necessarily being named, e.g. `ASTNode & HasResultType & HasSourceLocation`.
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Six programming languages I’d like to see
As far as graph-based languages and languages with arbitrary metadata and relationships between objects are concerned, I've been mulling over a language where expressions are represented as RDF graphs and that has built-in support for manipulating RDF graphs. I've use the concepts as an intermediate representation for functional expressions in a few different systems (including Factorio's map generator), but haven't yet had the motivation to really flesh it out into a full-blown language. https://github.com/TOGoS/TOGVM-Spec
prusti-dev
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Using_Prolog_as_the_AST
> The overall goal would be to figure out classical error conditions like nill pointers deference.
> If I can figure out if a pointer will be nil in some execution branch, there is no reason why a computer cannot do the same.
Note, this is called flow-sensitive typing (also called type narrowing) and I think that typescript does it.
https://en.wikipedia.org/wiki/Flow-sensitive_typing
> I personally would see this as an human race level upgrades. Imagine feeding your code to a CI that spit back something like: "you will have a panic at line 156 when your input is > 4"
A model checker can do that!
See this
https://model-checking.github.io/kani/tutorial-kinds-of-fail...
Other techniques are also possible
https://github.com/viperproject/prusti-dev#quick-example
(Here I could link a lot of things, I just selected two Rust projects to illustrate)
This works better if you are able to provide contracts in your API that says which guarantees you provide. Alternatively, asserts are useful too.
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Programming Languages Going Above and Beyond
You might be interested in the Prusti project, which statically checks for absence of reachable panics, overflows etc. It also allows user-defined specifications such as pre and post-conditions, loop body invariants, termination checking and so on.
https://github.com/viperproject/prusti-dev
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Trying to find a crate that allows you to constrain the value of arguments in various ways via a proc macro
This is called refinement types and prusti might be the project you saw.
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rustc-plugin: A framework for writing plugins that integrate with the Rust compiler
But there's also a lot of exciting work around formal verification like Prusti.
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Is there something like "super-safe" rust?
prusti
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A plan for cybersecurity and grid safety
Efforts: seL4, Project Everest, the Prossimo project of the ISRG, Let's Encrypt, and Prusti for the Rust language
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Prop v0.42 released! Don't panic! The answer is... support for dependent types :)
Wow that sounds really cool! I'm not an expert but does that mean that one day you could implement dependend types or refinement types in Rust as a crate ? I currently only know of tools like: Flux Creusot Kani Prusti
- Prusti: Static Analyzer for Rust
What are some alternatives?
impulse - Impossible Dev Tools for React and Tailwind
MIRAI - Rust mid-level IR Abstract Interpreter
dafny - Dafny is a verification-aware programming language
kani - Kani Rust Verifier
sdk - The Dart SDK, including the VM, dart2js, core libraries, and more.
Rudra - Rust Memory Safety & Undefined Behavior Detection
docs - Red-related user documentation repository
automem - C++-style automatic memory management smart pointers for D
DataLang - Specification and refernce implementation of DataLang
tectonic - A modernized, complete, self-contained TeX/LaTeX engine, powered by XeTeX and TeXLive.
imba - 🐤 The friendly full-stack language
rust - Empowering everyone to build reliable and efficient software.