79 lines
2.2 KiB
Rust
79 lines
2.2 KiB
Rust
use anyhow::Result;
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//https://docs.wasmtime.dev/examples-rust-multi-value.html
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fn main() -> Result<()> {
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use wasmtime::*;
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println!("Initializing...");
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let engine = Engine::default();
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let mut store = Store::new(&engine, ());
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// Compile.
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println!("Compiling module...");
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let module = Module::new(&engine, r#"
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(module
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(func $f (import "" "f") (param i32 i64) (result i64 i32))
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(func $g (export "g") (param i32 i64) (result i64 i32)
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(call $f (local.get 0) (local.get 1))
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)
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(func $round_trip_many
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(export "round_trip_many")
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(param i64 i64 i64 i64 i64 i64 i64 i64 i64 i64)
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(result i64 i64 i64 i64 i64 i64 i64 i64 i64 i64)
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local.get 0
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local.get 1
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local.get 2
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local.get 3
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local.get 4
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local.get 5
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local.get 6
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local.get 7
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local.get 8
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local.get 9)
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)
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"#)?;
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// Create a host function which takes multiple parameters and returns
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// multiple results.
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println!("Creating callback...");
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let callback_func = Func::wrap(&mut store, |a: i32, b: i64| -> (i64, i32) {
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(b + 1, a + 1)
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});
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// Instantiate.
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println!("Instantiating module...");
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let instance = Instance::new(&mut store, &module, &[callback_func.into()])?;
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// Extract exports.
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println!("Extracting export...");
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let g = instance.get_typed_func::<(i32, i64), (i64, i32)>(&mut store, "g")?;
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// Call `$g`.
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println!("Calling export \"g\"...");
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let (a, b) = g.call(&mut store, (1, 3))?;
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println!("Printing result...");
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println!("> {} {}", a, b);
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assert_eq!(a, 4);
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assert_eq!(b, 2);
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// Call `$round_trip_many`.
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println!("Calling export \"round_trip_many\"...");
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let round_trip_many = instance
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.get_typed_func::<
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(i64, i64, i64, i64, i64, i64, i64, i64, i64, i64),
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(i64, i64, i64, i64, i64, i64, i64, i64, i64, i64),
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>
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(&mut store, "round_trip_many")?;
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let results = round_trip_many.call(&mut store, (0, 1, 2, 3, 4, 5, 6, 7, 8, 9))?;
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println!("Printing result...");
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println!("> {:?}", results);
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assert_eq!(results, (0, 1, 2, 3, 4, 5, 6, 7, 8, 9));
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Ok(())
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} |