Thanks for the explanation. So for a smaller number of signals, I would have suggested Tcl value-change callbacks as a more generic and maintainable flow, but since you've already got a C program working(?) and you have "millions" of signals to monitor, frankly I can't think of anything better. I would have some concern about why you need to modify the netlist behaviour so radically. I presume you're doing something like fault injection, rather than fixing a faulty netlist ;-) so perhaps the only other idea I could offer would be to look at using Cadence's fault simulator, if that is indeed what you're doing...
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