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//! Example of instantiating two modules which link to each other.
// You can execute this example with `cargo run --example linking`
use wasi_common::sync::WasiCtxBuilder;
use wasmtime::*;
fn main() -> Result<()> {
let engine = Engine::default();
// First set up our linker which is going to be linking modules together. We
// want our linker to have wasi available, so we set that up here as well.
let mut linker = Linker::new(&engine);
wasi_common::sync::add_to_linker(&mut linker, |s| s)?;
// Load and compile our two modules
let linking1 = Module::from_file(&engine, "examples/linking1.wat")?;
let linking2 = Module::from_file(&engine, "examples/linking2.wat")?;
// Configure WASI and insert it into a `Store`
let wasi = WasiCtxBuilder::new()
.inherit_stdio()
.inherit_args()?
.build();
let mut store = Store::new(&engine, wasi);
// Instantiate our first module which only uses WASI, then register that
// instance with the linker since the next linking will use it.
let linking2 = linker.instantiate(&mut store, &linking2)?;
linker.instance(&mut store, "linking2", linking2)?;
// And with that we can perform the final link and the execute the module.
let linking1 = linker.instantiate(&mut store, &linking1)?;
let run = linking1.get_typed_func::<(), ()>(&mut store, "run")?;
run.call(&mut store, ())?;
Ok(())
}