1 //! Example of instantiating of the WebAssembly module and invoking its exported 2 //! function. 3 4 // You can execute this example with `cargo run --example gcd` 5 6 use anyhow::Result; 7 use wasmtime::*; 8 9 fn main() -> Result<()> { 10 // Load our WebAssembly (parsed WAT in our case), and then load it into a 11 // `Module` which is attached to a `Store` cache. After we've got that we 12 // can instantiate it. 13 let mut store = Store::<()>::default(); 14 let module = Module::from_file(store.engine(), "examples/gcd.wat")?; 15 let instance = Instance::new(&mut store, &module, &[])?; 16 17 // Invoke `gcd` export 18 let gcd = instance.get_typed_func::<(i32, i32), i32, _>(&mut store, "gcd")?; 19 20 println!("gcd(6, 27) = {}", gcd.call(&mut store, (6, 27))?); 21 Ok(()) 22 } 23