Maximum call stack size exceeded crash when running compat-multithreaded on Deno runtime

[n4t4l]

Steps to reproduce:

Run the following code on a Deno runtime

import initJolt from 'npm:jolt-physics/debug-wasm-compat-multithread';
export const Jolt = await initJolt();
console.log(Jolt);

Results in:

error: Uncaught (in worker "em-pthread-4") RangeError: Maximum call stack size exceeded
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
error: Uncaught (in worker "em-pthread-5") RangeError: Maximum call stack size exceeded
    at postMessage (file:///C:/Users/Alex/Desktop/joltnode/node_modules/.deno/[email protected]/node_modules/jolt-physics/dist/jolt-physics.debug.multithread.wasm-compat.js:1:1)
...

It works fine on Node runtimes, and I've been able to use it when passing the .wasm file via locateFile. Could be related to This issue?

[jrouwe]

I'm afraid that this is a bit beyond my control, emscripten generates the call to postMessage that fails:

if (ENVIRONMENT_IS_NODE && (ENVIRONMENT_IS_PTHREAD)) {
  // Create as web-worker-like an environment as we can.
  var parentPort = worker_threads['parentPort'];
  parentPort.on('message', (msg) => global.onmessage?.({ data: msg }));
  Object.assign(globalThis, {
    self: global,
    postMessage: (msg) => parentPort['postMessage'](msg),
  });
}

If I run the code on Node then parentPort equals:

MessagePort [EventTarget] {
  active: true,
  refed: false,
  [Symbol(kEvents)]: SafeMap(2) [Map] {
    'newListener' => { size: 1, next: [Listener], resistStopPropagation: false },
    'removeListener' => { size: 1, next: [Listener], resistStopPropagation: false }
  },
  [Symbol(events.maxEventTargetListeners)]: 10,
  [Symbol(events.maxEventTargetListenersWarned)]: false,
  [Symbol(kHandlers)]: SafeMap(0) [Map] {},
  [Symbol(kNewListener)]: [Function (anonymous)],
  [Symbol(kRemoveListener)]: [Function (anonymous)],
  [Symbol(nodejs.internal.kCurrentlyReceivingPorts)]: undefined
}

On deno it equals:

DedicatedWorkerGlobalScope {}

which seems to bork the communication between threads.

I can find some other tickets mentioning the same issue:

denoland/deno#17171
lovell/sharp#4372

Also emscripten doesn't seem to officially support deno:

emscripten-core/emscripten#23502 (comment)

And there appear to be various open issues for deno:

emscripten-core/emscripten#19359

The main problem seems to be support for theading, if you change your code to:

import initJolt from 'npm:jolt-physics/debug-wasm-compat';
export const Jolt = await initJolt();
console.log(Jolt);

then it seems to work.