hexagonal-sun/rust-jit-repl-playground

A project to test different approaches to doing implementing a rust REPL with a JIT.

Rust JIT REPL playground

This repository contains code to investigate different approaches to implementing a rust REPL using Cranelift's JIT compiler. For now we are using the same toy language as used the jit demo. The current approach is to JIT a function such as:

fn repl_1(rust_cb: fn(*const c_void) -> *const c_void, user_data: *const c_void, a: u32)
{
    // evaluate the last parsed stmt.
    let b: u32 = {}
    
    // Call back into rust to read the next line, 
    // jit it and return the function pointer.
    let fn_ptr = rust_cb(user_data); // REPL prompt here.
    fn_ptr(rust_cb, user_data, a, b);
}

Here we have a binding already active a. During a's (repl_0) rust callback we inspected the parsed statement and picked up an additional binding b. We then JIT'd the above function that will pass on b onto the next call.