Virtual vs Nonvirtual Traps: Exercises

Practice exercises

Exercise 1

A UVM component stores sequencers in an array of base type and calls mode_name(). Derived classes implement mode_name(), yet logs always show base mode. What is the minimum code change?

Solution

Declare mode_name() as virtual in the base class. Then calls through base handles dispatch to derived implementations.

Exercise 2

You already made run_phase() virtual, but protocol-specific formatting still looks base-only. Where is the likely design mistake?

Solution

A helper called from run_phase() is probably nonvirtual in the base class. Mark that helper virtual if it is intended as an extension point.

Related topics

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