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61 lines
2.0 KiB
61 lines
2.0 KiB
//! Small example of how to use `externref`s.
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// You can execute this example with `cargo run --example externref`
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use wasmtime::*;
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fn main() -> Result<()> {
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println!("Initializing...");
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let mut config = Config::new();
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config.wasm_reference_types(true);
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let engine = Engine::new(&config)?;
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let mut store = Store::new(&engine, ());
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println!("Compiling module...");
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let module = Module::from_file(&engine, "examples/externref.wat")?;
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println!("Instantiating module...");
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let instance = Instance::new(&mut store, &module, &[])?;
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println!("Creating new `externref`...");
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let externref = ExternRef::new(&mut store, "Hello, World!");
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assert!(externref.data(&store)?.is::<&'static str>());
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assert_eq!(
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*externref
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.data(&store)?
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.downcast_ref::<&'static str>()
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.unwrap(),
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"Hello, World!"
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);
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println!("Touching `externref` table...");
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let table = instance.get_table(&mut store, "table").unwrap();
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table.set(&mut store, 3, Some(externref.clone()).into())?;
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let elem = table
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.get(&mut store, 3)
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.unwrap() // assert in bounds
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.unwrap_extern() // assert it's an externref table
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.copied()
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.unwrap(); // assert the externref isn't null
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assert!(Rooted::ref_eq(&store, &elem, &externref)?);
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println!("Touching `externref` global...");
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let global = instance.get_global(&mut store, "global").unwrap();
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global.set(&mut store, Some(externref.clone()).into())?;
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let global_val = global.get(&mut store).unwrap_externref().copied().unwrap();
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assert!(Rooted::ref_eq(&store, &global_val, &externref)?);
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println!("Calling `externref` func...");
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let func = instance.get_typed_func::<Option<Rooted<ExternRef>>, Option<Rooted<ExternRef>>>(
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&mut store, "func",
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)?;
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let ret = func.call(&mut store, Some(externref))?;
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assert!(ret.is_some());
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assert!(Rooted::ref_eq(&store, &ret.unwrap(), &externref)?);
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println!("GCing within the store...");
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store.gc();
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println!("Done.");
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Ok(())
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}
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