question on how are upvalues handled

[Andrea <andrea.l.vitali@...>]

locals are pointers to the stack (just a number because the stack frame is limited)

upvalues are pointers to the stack that can later become pointers to the heap, does this mean that every upvalue is made of 2 pointers (using twice the space) or it is made of 1 pointer with a tag that is changed/update when the upvalue is moved from the stack to the heap?

(forgive me for the language not very accurate - I hope the question is clear) 

   Andrea

--

Andrea Vitali

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