rust-wasm64-example/index.html at main · clealabs/rust-wasm64-example · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Run wasm64 in Chrome</title>
  </head>
  <body>
    <h1>wasm64 test</h1>
    <pre id="out"></pre>

    <script>
      let sharedMemory = null;
      const out = document.getElementById("out");

      function write(s) {
        out.textContent += s + "\n";
        console.log(s);
      }

      const imports = {
        host: {
          host_print: (ptr, len) => {
            const p = Number(ptr); // ptr is BigInt
            const l = Number(len);
            if (!sharedMemory) {
              write("ERROR: no memory yet");
              return;
            }
            const bytes = new Uint8Array(sharedMemory.buffer, p, l);
            const s = new TextDecoder().decode(bytes);
            write(s);
          },
        },
      };

      (async () => {
        try {
          const { instance } = await WebAssembly.instantiateStreaming(
            fetch(
              "hello-world-wasm64/target/wasm64-unknown-unknown/release/hello_world_wasm64.wasm"
            ),
            imports
          );

          sharedMemory = instance.exports.memory;

          if (typeof instance.exports.run === "function") {
            instance.exports.run();
          } else {
            write("no run() export found");
          }
        } catch (e) {
          write("instantiate error: " + e);
          console.error(e);
        }
      })();
    </script>
  </body>
</html>