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54 lines
1.7 KiB
54 lines
1.7 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 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 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 imports = [];
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let instance = Instance::new(&store, &module, &imports)?;
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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("table").unwrap();
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table.set(3, Some(externref.clone()).into())?;
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let elem = table.get(3).unwrap().unwrap_externref().unwrap();
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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("global").unwrap();
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global.set(Some(externref.clone()).into())?;
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let global_val = global.get().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 = instance.get_func("func").unwrap();
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let func = func.get1::<Option<ExternRef>, Option<ExternRef>>()?;
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let ret = func(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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