Tracing ruby programs with set_trace_func

Posted by Anurag in
Thursday, December 15. 2011

At times you may need to trace a ruby program's execution flow. Ruby's set_trace_func comes handy there.

When saved in a file called trace.rb and executed with $ ruby trace.rb, it outputs

   2011-12-15 00:33:26 +0530 c-return trace.rb:3  set_trace_func   Kernel

   2011-12-15 00:33:26 +0530     line trace.rb:5                     

   2011-12-15 00:33:26 +0530   c-call trace.rb:5        puts   Kernel

   2011-12-15 00:33:26 +0530   c-call trace.rb:5        puts       IO

   2011-12-15 00:33:26 +0530   c-call trace.rb:5       write       IO

*** Hello World

   2011-12-15 00:33:26 +0530 c-return trace.rb:5       write       IO

   2011-12-15 00:33:26 +0530 c-return trace.rb:5        puts       IO

   2011-12-15 00:33:26 +0530 c-return trace.rb:5        puts   Kernel

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