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37 lines
1.4 KiB
37 lines
1.4 KiB
//! Example of instantiating two modules which link to each other.
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// You can execute this example with `cargo run --example linking`
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use wasi_common::sync::WasiCtxBuilder;
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use wasmtime::*;
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fn main() -> Result<()> {
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let engine = Engine::default();
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// First set up our linker which is going to be linking modules together. We
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// want our linker to have wasi available, so we set that up here as well.
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let mut linker = Linker::new(&engine);
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wasi_common::sync::add_to_linker(&mut linker, |s| s)?;
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// Load and compile our two modules
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let linking1 = Module::from_file(&engine, "examples/linking1.wat")?;
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let linking2 = Module::from_file(&engine, "examples/linking2.wat")?;
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// Configure WASI and insert it into a `Store`
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let wasi = WasiCtxBuilder::new()
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.inherit_stdio()
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.inherit_args()?
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.build();
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let mut store = Store::new(&engine, wasi);
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// Instantiate our first module which only uses WASI, then register that
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// instance with the linker since the next linking will use it.
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let linking2 = linker.instantiate(&mut store, &linking2)?;
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linker.instance(&mut store, "linking2", linking2)?;
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// And with that we can perform the final link and the execute the module.
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let linking1 = linker.instantiate(&mut store, &linking1)?;
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let run = linking1.get_typed_func::<(), ()>(&mut store, "run")?;
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run.call(&mut store, ())?;
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Ok(())
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}
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