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Mark

TODO: Would it be funny to just have a video clip of me going "MAAARRKKKK" and that's it?

I'd advise against it.

In some mark and sweep implementations you'll see different ways to mark "root objects" – the objects directly referenced by stack frames. However, in our simplistic VM it's a bit easier to find and mark all of the directly referenced objects. You'll see why when you write it in a moment.

Assignment

Complete the mark function in vm.c. It should set every object that's directly referenced by a stack frame to is_marked = true.

Iterate over each frame in the VM
Iterate over each references object in each frame
Mark the objects as is_marked = true