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`.
50 lines
1.4 KiB
Rust
50 lines
1.4 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 engine = Engine::default();
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let store = HostRef::new(Store::new(&engine));
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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 = HostRef::new(
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Module::new(&store, &binary).map_err(|e| format!("failed to compile module: {}", e))?,
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);
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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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