You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.9 KiB
57 lines
1.9 KiB
//! Small example of how to use `externref`s.
|
|
|
|
// You can execute this example with `cargo run --example externref`
|
|
|
|
use anyhow::Result;
|
|
use wasmtime::*;
|
|
|
|
fn main() -> Result<()> {
|
|
println!("Initializing...");
|
|
let mut config = Config::new();
|
|
config.wasm_reference_types(true);
|
|
let engine = Engine::new(&config)?;
|
|
let mut store = Store::new(&engine, ());
|
|
|
|
println!("Compiling module...");
|
|
let module = Module::from_file(&engine, "examples/externref.wat")?;
|
|
|
|
println!("Instantiating module...");
|
|
let instance = Instance::new(&mut store, &module, &[])?;
|
|
|
|
println!("Creating new `externref`...");
|
|
let externref = ExternRef::new("Hello, World!");
|
|
assert!(externref.data().is::<&'static str>());
|
|
assert_eq!(
|
|
*externref.data().downcast_ref::<&'static str>().unwrap(),
|
|
"Hello, World!"
|
|
);
|
|
|
|
println!("Touching `externref` table...");
|
|
let table = instance.get_table(&mut store, "table").unwrap();
|
|
table.set(&mut store, 3, Some(externref.clone()).into())?;
|
|
let elem = table
|
|
.get(&mut store, 3)
|
|
.unwrap() // assert in bounds
|
|
.unwrap_externref() // assert it's an externref table
|
|
.unwrap(); // assert the externref isn't null
|
|
assert!(elem.ptr_eq(&externref));
|
|
|
|
println!("Touching `externref` global...");
|
|
let global = instance.get_global(&mut store, "global").unwrap();
|
|
global.set(&mut store, Some(externref.clone()).into())?;
|
|
let global_val = global.get(&mut store).unwrap_externref().unwrap();
|
|
assert!(global_val.ptr_eq(&externref));
|
|
|
|
println!("Calling `externref` func...");
|
|
let func =
|
|
instance.get_typed_func::<Option<ExternRef>, Option<ExternRef>, _>(&mut store, "func")?;
|
|
let ret = func.call(&mut store, Some(externref.clone()))?;
|
|
assert!(ret.is_some());
|
|
assert!(ret.unwrap().ptr_eq(&externref));
|
|
|
|
println!("GCing within the store...");
|
|
store.gc();
|
|
|
|
println!("Done.");
|
|
Ok(())
|
|
}
|
|
|