51 lines
1.7 KiB
Rust
51 lines
1.7 KiB
Rust
extern crate core;
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use anyhow::Result;
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use wasmtime::*;
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// #[wasm_bindgen]
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// extern {
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// pub fn alert(s: &str);
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// }
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//
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// #[wasm_bindgen]
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// pub fn greet(name: &str) {
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// alert(&format!("Hello, {}!", name));
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// }
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fn main() -> Result<()> {
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let engine = Engine::default();
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let wasm = std::fs::read("./examples/hello_wasm_bg.wasm")?;
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let module = Module::new(&engine, wasm)?;
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let mut linker = Linker::new(&engine);
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linker.func_wrap("./hello_wasm.js", "__wbg_alert_a5a2f68cc09adc6e", |caller: Caller<'_, u32>, param: i32, param2: i32| {
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let mut caller = caller;
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if let Extern::Memory(memory) = caller.get_export("memory").unwrap() {
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let mut buffer = vec![0; param2 as usize];
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memory.read(caller.as_context(), param as usize, &mut buffer).expect("read mem error");
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let s = String::from_utf8_lossy(&buffer).to_string();
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println!("[alert]: {}", s);
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} else {
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panic!("Should happen, got not memory");
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}
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})?;
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let mut store = Store::new(&engine, 0);
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let instance = linker.instantiate(&mut store, &module)?;
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let memory = instance.get_memory(&mut store, "memory")
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.ok_or_else(|| anyhow::format_err!("failed to find `memory` export"))?;
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// println!("memory size: {}", memory.size(&store));
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let msg = "hatter".as_bytes();
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let malloc_fn = instance.get_typed_func::<i32, i32, _>(&mut store, "__wbindgen_malloc")?;
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let msg_ptr = malloc_fn.call(&mut store, msg.len() as i32)?;
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memory.write(&mut store, msg_ptr as usize, msg)?;
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let greet_fn = instance.get_typed_func::<(i32, i32), (), _>(&mut store, "greet")?;
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greet_fn.call(&mut store, (msg_ptr, msg.len() as i32))?;
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Ok(())
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}
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