Next Steps

This is a loose TODO list with things we’re planning to add next. This is not meant to be a compreheensive list. A lot of the coverage we will add as we try more complex examples.

• Reference handling
• Heap allocation
• Drop semantics
• ADTs
• Intrinsics
• DST (partial — slices work, dyn Trait not yet supported)
• Crate loading

Native calls

• PassMode::Cast support (requires CastTarget in rustc_public)
• Symbol caching (avoid repeated dlsym lookups)
• Trampoline caching (reuse compiled trampolines for identical signatures)
• Function pointer callbacks (native → interpreter via JIT stubs)
• #[track_caller] implicit argument support

RustC Public

Here is a list of things that we can improve in rustc_public:

1. Add PlaceRef. Make it more efficient to process Place.
   • Once we do this, we can remove place creation in the interpreter
2. Add a way to retrieve all mono items
3. Add a way to retrieve source for a span so we can use annotate_snippets.
4. Expose CastTarget details from PassMode::Cast (needed for struct pass/return in C ABI)
5. Expose #[track_caller] implicit argument info (see https://github.com/rust-lang/rust/pull/159204)