Function manually_destroy

tests/all/component_model/resources.rs:419–502

()

#[test]
fn manually_destroy() -> Result<()> {
    let engine = super::engine();
    let c = Component::new(
        &engine,
        r#"
            (component
                (import "t1" (type $t1 (sub resource)))

                (core module $m
                  (global $drops (mut i32) i32.const 0)
                  (global $last-drop (mut i32) i32.const 0)

                  (func (export "dtor") (param i32)
                    (global.set $drops (i32.add (global.get $drops) (i32.const 1)))
                    (global.set $last-drop (local.get 0))
                  )
                  (func (export "drops") (result i32) global.get $drops)
                  (func (export "last-drop") (result i32) global.get $last-drop)
                  (func (export "pass") (param i32) (result i32) local.get 0)
                )
                (core instance $i (instantiate $m))
                (type $t2' (resource (rep i32) (dtor (func $i "dtor"))))
                (export $t2 "t2" (type $t2'))
                (core func $ctor (canon resource.new $t2))
                (func (export "[constructor]t2") (param "rep" u32) (result (own $t2))
                  (canon lift (core func $ctor)))
                (func (export "[static]t2.drops") (result u32)
                  (canon lift (core func $i "drops")))
                (func (export "[static]t2.last-drop") (result u32)
                  (canon lift (core func $i "last-drop")))

                (func (export "t1-pass") (param "t" (own $t1)) (result (own $t1))
                  (canon lift (core func $i "pass")))
            )
        "#,
    )?;

    struct MyType;

    #[derive(Default)]
    struct Data {
        drops: u32,
        last_drop: Option<u32>,
    }

    let mut store = Store::new(&engine, Data::default());
    let mut linker = Linker::new(&engine);
    linker
        .root()
        .resource("t1", ResourceType::host::<MyType>(), |mut cx, rep| {
            let data: &mut Data = cx.data_mut();
            data.drops += 1;
            data.last_drop = Some(rep);
            Ok(())
        })?;
    let i = linker.instantiate(&mut store, &c)?;
    let t2_ctor = i.get_typed_func::<(u32,), (ResourceAny,)>(&mut store, "[constructor]t2")?;
    let t2_drops = i.get_typed_func::<(), (u32,)>(&mut store, "[static]t2.drops")?;