Coccinelle for Rust

Coccinelle is a tool for automatic program matching and transformation that was originally developed for making large scale changes to the Linux kernel source code (ie, C code). Matches and transformations are driven by user-specific transformation rules having the form of abstracted patches, referred to as semantic patches. As the Linux kernel, and systems software more generally, is starting to adopt Rust, we are developing Coccinelle for Rust, to make the power of Coccinelle available to Rust codebases.


Changing a method call sequence in the Rust implementation:

expression tcx, arg;
- tcx.type_of(arg)
+ tcx.bound_type_of(arg).subst_identity()

Replace Generic Bound with Impl Trait:

identifier f, P, p;
type T1, T2;
- f<P: T1>(p: P) -> T2
+ f(p: impl T1) -> T2
     { ... }

Current status

Coccinelle for Rust is currently a prototype. It relies on Rust Analyzer for parsing and rustfmt for pretty printing. It mainly supports matching and transformation of expressions and types, but reasoning about control flow is not yet supported.


Coccinelle for Rust

A recent talk about Coccinelle for Rust