1 //! Example of instantiating two modules which link to each other. 2 3 // You can execute this example with `cargo run --example linking` 4 5 use wasi_common::sync::WasiCtxBuilder; 6 use wasmtime::*; 7 8 fn main() -> Result<()> { 9 let engine = Engine::default(); 10 11 // First set up our linker which is going to be linking modules together. We 12 // want our linker to have wasi available, so we set that up here as well. 13 let mut linker = Linker::new(&engine); 14 wasi_common::sync::add_to_linker(&mut linker, |s| s)?; 15 16 // Load and compile our two modules 17 let linking1 = Module::from_file(&engine, "examples/linking1.wat")?; 18 let linking2 = Module::from_file(&engine, "examples/linking2.wat")?; 19 20 // Configure WASI and insert it into a `Store` 21 let wasi = WasiCtxBuilder::new() 22 .inherit_stdio() 23 .inherit_args()? 24 .build(); 25 let mut store = Store::new(&engine, wasi); 26 27 // Instantiate our first module which only uses WASI, then register that 28 // instance with the linker since the next linking will use it. 29 let linking2 = linker.instantiate(&mut store, &linking2)?; 30 linker.instance(&mut store, "linking2", linking2)?; 31 32 // And with that we can perform the final link and the execute the module. 33 let linking1 = linker.instantiate(&mut store, &linking1)?; 34 let run = linking1.get_typed_func::<(), ()>(&mut store, "run")?; 35 run.call(&mut store, ())?; 36 Ok(()) 37 } 38