How to tie every variable in perl script?

Question

I want to see every place when variable in perl script is created/accessed/destroyed

It is easily reachable using tie or Variable::Magic

But how to apply this magic automatically when variable is created?

Answer 1

You can take a look at B::Xref which generates a cross reference listing of all variables in your application. Basically, you need to walk the byte code to find all variable declarations/initializations. You can also alter the byte code, i.e. add code to tie the variables. However, I cannot point you to an example, because this is rarely done.

As an alternative, you could use a code filter to add the tie() instructions. However, code filters are not guaranteed to correctly identify variable declarations/initializations.