46 lines
1.2 KiB
Rust
46 lines
1.2 KiB
Rust
use anyhow::Result;
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use wasmtime::*;
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// https://docs.wasmtime.dev/examples-rust-gcd.html
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fn main() -> Result<()> {
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// Load our WebAssembly (parsed WAT in our case), and then load it into a
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// `Module` which is attached to a `Store` cache. After we've got that we
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// can instantiate it.
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let mut store = Store::<()>::default();
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let module = Module::new(store.engine(), r#"
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(module
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(func $gcd (param i32 i32) (result i32)
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(local i32)
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block ;; label = @1
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block ;; label = @2
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local.get 0
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br_if 0 (;@2;)
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local.get 1
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local.set 2
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br 1 (;@1;)
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end
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loop ;; label = @2
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local.get 1
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local.get 0
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local.tee 2
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i32.rem_u
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local.set 0
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local.get 2
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local.set 1
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local.get 0
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br_if 0 (;@2;)
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end
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end
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local.get 2
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)
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(export "gcd" (func $gcd))
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)
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"#)?;
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let instance = Instance::new(&mut store, &module, &[])?;
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// Invoke `gcd` export
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let gcd = instance.get_typed_func::<(i32, i32), i32>(&mut store, "gcd")?;
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println!("gcd(6, 27) = {}", gcd.call(&mut store, (6, 27))?);
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Ok(())
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} |