Function wasm_dropping_refs

tests/all/gc.rs:98–127

()

#[test]
#[cfg_attr(miri, ignore)]
fn wasm_dropping_refs() -> Result<()> {
    let (mut store, module) = ref_types_module(
        false,
        r#"
            (module
                (func (export "drop_ref") (param externref)
                    nop
                )
            )
        "#,
    )?;

    let instance = Instance::new(&mut store, &module, &[])?;
    let drop_ref = instance.get_func(&mut store, "drop_ref").unwrap();

    let num_refs_dropped = Arc::new(AtomicUsize::new(0));

    for _ in 0..4096 {
        let mut scope = RootScope::new(&mut store);
        let r = ExternRef::new(&mut scope, CountDrops(num_refs_dropped.clone()))?;
        let args = [Val::ExternRef(Some(r))];
        drop_ref.call(&mut scope, &args, &mut [])?;
    }

    // After doing a GC, all the refs should have been dropped.
    store.gc(None)?;
    assert_eq!(num_refs_dropped.load(SeqCst), 4096);

    return Ok(());
}

#[test]
#[cfg_attr(miri, ignore)]