420dcd76fd
* Don't require `Store` in `Instance` constructor This can be inferred from the `Module` argument. Additionally add a `store` accessor to an `Instance` in case it's needed to instantiate another `Module`. cc #708 * Update more constructors * Fix a doctest * Don't ignore store in `wasm_instance_new` * Run rustfmt
68 lines
1.7 KiB
Rust
68 lines
1.7 KiB
Rust
use std::cell::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<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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.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 store = Store::default();
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let wasm = wat::parse_str(WAT).unwrap();
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let module = 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 = 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 =
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Instance::new(&module, imports.as_slice()).expect("failed to instantiate module");
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let exports = 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.call(&[]).expect("expected function not to trap");
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}
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