tracepoint.rb

class Dog
  def initialize; end
  def bark; end
end

trace = TracePoint.new(:call, :return) do |tp|
  p [tp.event, tp.defined_class, tp.method_id]
end

trace.enable do
  buddy = Dog.new
  buddy.bark
end

# [:call, Dog, :initialize]
# [:return, Dog, :initialize]
# [:call, Dog, :bark]
# [:return, Dog, :bark]