wasmtime.rs

use wasmtime::*;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut config = Config::new();
    config.profiler(ProfilingStrategy::JitDump)?;
    let engine = Engine::new(&config);
    let store = Store::new(&engine);
    let module = Module::from_file(&engine, "./fib.wasm")?;
    let instance = Instance::new(&store, &module, &[])?;
    let start = instance.get_func("main").unwrap();
    let start = start.get2::<i32, i32, i32>()?;

    unsafe {
        let n = 1 << 13; // 12 works
        let a = libc::mmap(
            0 as *mut _,
            n,
            libc::PROT_READ | libc::PROT_WRITE,
            libc::MAP_PRIVATE | libc::MAP_ANONYMOUS,
            -1,
            0,
        );
        libc::mprotect(a, n, libc::PROT_READ | libc::PROT_EXEC);
    }

    start(0, 0)?;

    Ok(())
}