For my use case, I only want to use HTML/JS to start WASM and hand it a canvas and events. Things like i/o contexts would have to be reconstructed if possible. Is there anything else? On Dec 17, 2022, at 1:40 PM, 'Sam Clegg' via emscripten-discuss <emscripten-discuss@googlegroups.com> wrote:
Neat! That might work for the linear memory, but as I said in an earlier reply there is more to the state of a running module than just its memory.
Just for fun, I tried asking ChatGPT:
[[Please write some _javascript_ code which stores the state of a WebAssembly instance to a byte array.]]
// First, create a WebAssembly instance and obtain a reference to its memory object
const wasmInstance = new WebAssembly.Instance(wasmModule);
const memory = wasmInstance.exports.memory;
// Next, create a _javascript_ typed array to hold the contents of the memory object
const memoryArray = new Uint8Array(memory.buffer);
// Finally, use the copy method to copy the contents of the memory object to the typed array
memory.copy(memoryArray);
[[Thanks. Could you also write some _javascript_ code which creates a new WebAssembly instance and uses this byte array to restore the previous state?]]
// First, create a WebAssembly module using the WebAssembly.compile function
const wasmModule = await WebAssembly.compile(wasmCode);
// Next, create a new WebAssembly instance and obtain a reference to its memory object
const wasmInstance = new WebAssembly.Instance(wasmModule);
const memory = wasmInstance.exports.memory;
// Use the copy method to copy the contents of the byte array into the memory object of the WebAssembly instance
memory.copy(byteArray);
// Now, the WebAssembly instance has been restored to the previous state
//...It is important to note that the byte array must be the same size as the memory object of the WebAssembly instance, and it must contain a valid snapshot of the state of the WebAssembly instance. If the byte array is not the correct size or does not contain a valid snapshot, the WebAssembly instance may not be restored correctly.
I haven’t had a chance to give it a try yet. Does it look reasonable?
Steve
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