wasm_greeter.js

(async _=>{
    //Create wasm instance
    let greeter=window.greeter=
        (await WebAssembly.instantiateStreaming(fetch('wasm.wasm'))).instance.exports;

    //Convert name string to UTF-8 bytes
    let name_bytes=new TextEncoder().encode("テスト");
    //Get pointer to input buffer
    let name_ptr=greeter.get_input_ptr();
    console.log(name_ptr);
    //Dump name into the input buffer with a null
    let name_mem=new Uint8Array(greeter.memory.buffer, name_ptr, name_bytes.length+1);
    name_mem.set(name_bytes);
    name_mem[name_bytes.length]=0;

    let resp_ptr=greeter.greet(name_ptr);
    console.log(resp_ptr);
    let resp_mem=new Uint8Array(greeter.memory.buffer, resp_ptr);
    console.log(new TextDecoder().decode(
        //Find the end of string via null
        resp_mem.subarray(0,resp_mem.indexOf(0))
    ));
})();