1fe76ef9e3
This commit continues previous work and also #708 by removing the need to use `HostRef<Module>` in the API of the `wasmtime` crate. The API changes performed here are: * The `Module` type is now itself internally reference counted. * The `Module::store` function now returns the `Store` that was used to create a `Module` * Documentation for `Module` and its methods have been expanded.
48 lines
1.3 KiB
Rust
48 lines
1.3 KiB
Rust
use std::rc::Rc;
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use wasmtime::*;
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use wat::parse_str;
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#[test]
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fn test_trap_return() -> Result<(), String> {
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struct HelloCallback;
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impl Callable for HelloCallback {
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fn call(&self, _params: &[Val], _results: &mut [Val]) -> Result<(), Trap> {
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Err(Trap::new("test 123"))
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}
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}
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let store = Store::default();
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let binary = parse_str(
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r#"
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(module
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(func $hello (import "" "hello"))
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(func (export "run") (call $hello))
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)
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"#,
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)
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.map_err(|e| format!("failed to parse WebAssembly text source: {}", e))?;
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let module =
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Module::new(&store, &binary).map_err(|e| format!("failed to compile module: {}", e))?;
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let hello_type = FuncType::new(Box::new([]), Box::new([]));
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let hello_func = HostRef::new(Func::new(&store, hello_type, Rc::new(HelloCallback)));
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let imports = vec![hello_func.into()];
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let instance = Instance::new(&store, &module, imports.as_slice())
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.map_err(|e| format!("failed to instantiate module: {:?}", e))?;
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let run_func = instance.exports()[0]
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.func()
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.expect("expected function export");
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let e = run_func
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.borrow()
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.call(&[])
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.err()
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.expect("error calling function");
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assert_eq!(e.message(), "test 123");
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Ok(())
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}
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