7a1b7cdf92
Implement Wasmtime's new API as designed by RFC 11. This is quite a large commit which has had lots of discussion externally, so for more information it's best to read the RFC thread and the PR thread.
58 lines
1.9 KiB
Rust
58 lines
1.9 KiB
Rust
//! 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 anyhow::Result;
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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("Hello, World!");
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assert!(externref.data().is::<&'static str>());
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assert_eq!(
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*externref.data().downcast_ref::<&'static str>().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_externref() // assert it's an externref table
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.unwrap(); // assert the externref isn't null
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assert!(elem.ptr_eq(&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().unwrap();
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assert!(global_val.ptr_eq(&externref));
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println!("Calling `externref` func...");
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let func =
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instance.get_typed_func::<Option<ExternRef>, Option<ExternRef>, _>(&mut store, "func")?;
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let ret = func.call(&mut store, Some(externref.clone()))?;
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assert!(ret.is_some());
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assert!(ret.unwrap().ptr_eq(&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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