From: Joel VanderWerf <vjoel@...>
Date: 2007-09-13T02:37:43+09:00
Subject: Re: Logging all method calls?

Gustav Paul wrote:
> Hey
> 
> Is there a way to log all the method calls that occur throughout the
> execution of some script? Something like an hook that gets called whenever a
> method executes would be ideal.
> 
> Eg.
> 
> class Object
>   def before_method_called(method_name)
>     p class.name + method_name.to_s
>   end
> end

There's a heavy speed cost to this, but it's what your asking for...

  ri set_trace_func | cat
-------------------------------------------------- Kernel#set_trace_func
      set_trace_func(proc)    => proc
      set_trace_func(nil)     => nil
------------------------------------------------------------------------
      Establishes proc as the handler for tracing, or disables tracing
      if the parameter is nil. proc takes up to six parameters: an event
      name, a filename, a line number, an object id, a binding, and the
      name of a class. proc is invoked whenever an event occurs. Events
      are: c-call (call a C-language routine), c-return (return from a
      C-language routine), call (call a Ruby method), class (start a
      class or module definition), end (finish a class or module
      definition), line (execute code on a new line), raise (raise an
      exception), and return (return from a Ruby method). Tracing is
      disabled within the context of proc.

          class Test
          def test
            a = 1
            b = 2
          end
          end

          set_trace_func proc { |event, file, line, id, binding, classname|
             printf "%8s %s:%-2d %10s %8s\n", event, file, line, id, 
classname
          }
          t = Test.new
          t.test

            line prog.rb:11               false
          c-call prog.rb:11        new    Class
          c-call prog.rb:11 initialize   Object
        c-return prog.rb:11 initialize   Object
        c-return prog.rb:11        new    Class
            line prog.rb:12               false
            call prog.rb:2        test     Test
            line prog.rb:3        test     Test
            line prog.rb:4        test     Test
          return prog.rb:4        test     Test



-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407