Graphics on BangleJS2

If you would allocate writable data separately in JS and pass it as pointers to code stored to flash it needs no changes.

Something like this?

function malloc(size) {
  return E.getAddressOf(new Uint8Array(size), true);
}

Can that be called from C? Also, does the GC know when it is safe to free the Uint8Array?
Would I need to keep references to the Uint8Array in JS to keep it from being collected?

const blocks = [];
function malloc(size) {
  let block = new Uint8Array(size);
  blocks.push(block);
  return E.getAddressOf(block, true);
}
function free(addr) {
  for (let i = 0; i < blocks.length; ++i) {
    if (addr == E.getAddressOf(blocks[i], true)) {
      let last = blocks.pop();
      if (blocks.length != i) blocks[i] = last;
      return;
    }
  }
}

Edit: To call that from C it seems what I need is jspGetNamedVariable and jspeFunctionCall.

Edit2: It might make sense to have a libespruino that implements malloc/free/sin/cos/sinf/cosf/etc by calling the JS implementations.