b9dc38f4e1
This commit removes the need to use `HostRef<Engine>` in the Rust API. Usage is retained in the C API in one location, but otherwise `Engine` can always be used directly. This is the first step of progress on #708 for the `Engine` type. Changes here include: * `Engine` is now `Clone`, and is documented as being cheap. It's not intended that cloning an engine creates a deep copy. * `Engine` is now both `Send` and `Sync`, and asserted to be so. * Usage of `Engine` in APIs no longer requires or uses `HostRef`.
74 lines
1.9 KiB
Rust
74 lines
1.9 KiB
Rust
use std::cell::{Ref, RefCell};
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use std::rc::Rc;
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use wasmtime::*;
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#[test]
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fn test_import_calling_export() {
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const WAT: &str = r#"
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(module
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(type $t0 (func))
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(import "" "imp" (func $.imp (type $t0)))
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(func $run call $.imp)
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(func $other)
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(export "run" (func $run))
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(export "other" (func $other))
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)
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"#;
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struct Callback {
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pub other: RefCell<Option<HostRef<Func>>>,
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}
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impl Callable for Callback {
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fn call(&self, _params: &[Val], _results: &mut [Val]) -> Result<(), Trap> {
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self.other
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.borrow()
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.as_ref()
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.expect("expected a function ref")
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.borrow()
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.call(&[])
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.expect("expected function not to trap");
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Ok(())
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}
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}
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let engine = Engine::default();
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let store = HostRef::new(Store::new(&engine));
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let wasm = wat::parse_str(WAT).unwrap();
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let module = HostRef::new(Module::new(&store, &wasm).expect("failed to create module"));
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let callback = Rc::new(Callback {
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other: RefCell::new(None),
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});
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let callback_func = HostRef::new(Func::new(
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&store,
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FuncType::new(Box::new([]), Box::new([])),
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callback.clone(),
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));
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let imports = vec![callback_func.into()];
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let instance = HostRef::new(
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Instance::new(&store, &module, imports.as_slice()).expect("failed to instantiate module"),
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);
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let exports = Ref::map(instance.borrow(), |instance| instance.exports());
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assert!(!exports.is_empty());
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let run_func = exports[0]
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.func()
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.expect("expected a run func in the module");
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*callback.other.borrow_mut() = Some(
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exports[1]
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.func()
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.expect("expected an other func in the module")
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.clone(),
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);
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run_func
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.borrow()
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.call(&[])
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.expect("expected function not to trap");
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}
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