trace

Trace uses #set_trace_func to trace Ruby method calls.

Installing

In your Gemfile:

gem 'trace'

In your code:

require 'trace'

def foo(val)
  bar(val + 1)
end

def bar(val)
  val
end

trace do
  foo(2)
end

The output will be like this:

[TRACE] hey.rb:3 Object#foo
[TRACE] hey.rb:7 Object#bar