Function get_set_externref_globals_via_api

tests/all/externals.rs:156–207

()

#[test]
fn get_set_externref_globals_via_api() -> wasmtime::Result<()> {
    let mut cfg = Config::new();
    cfg.wasm_reference_types(true);
    let engine = Engine::new(&cfg)?;
    let mut store = Store::new(&engine, ());

    // Initialize with a null externref.

    let global = Global::new(
        &mut store,
        GlobalType::new(ValType::EXTERNREF, Mutability::Var),
        Val::ExternRef(None),
    )?;
    assert!(global.get(&mut store).unwrap_externref().is_none());

    let hello = ExternRef::new(&mut store, "hello".to_string())?;
    global.set(&mut store, hello.into())?;
    let r = global.get(&mut store).unwrap_externref().cloned().unwrap();
    assert!(
        r.data(&store)?
            .expect("should have host data")
            .is::<String>()
    );
    assert_eq!(
        r.data(&store)?
            .expect("should have host data")
            .downcast_ref::<String>()
            .unwrap(),
        "hello"
    );

    // Initialize with a non-null externref.

    let externref = ExternRef::new(&mut store, 42_i32)?;
    let global = Global::new(
        &mut store,
        GlobalType::new(ValType::EXTERNREF, Mutability::Const),
        externref.into(),
    )?;
    let r = global.get(&mut store).unwrap_externref().cloned().unwrap();
    assert!(r.data(&store)?.expect("should have host data").is::<i32>());
    assert_eq!(
        r.data(&store)?
            .expect("should have host data")
            .downcast_ref::<i32>()
            .copied()
            .unwrap(),
        42
    );

    Ok(())
}

#[test]
fn get_set_funcref_globals_via_api() -> wasmtime::Result<()> {