trace_func

# File lib/debug.rb, line 841
    def trace_func(event, file, line, id, binding, klass)
      Tracer.trace_func(event, file, line, id, binding, klass) if trace?
      context(Thread.current).check_suspend
      @file = file
      @line = line
      case event
      when 'line'
        frame_set_pos(file, line)
        if !@no_step or @frames.size == @no_step
          @stop_next -= 1
          @stop_next = -1 if @stop_next < 0
        elsif @frames.size < @no_step
          @stop_next = 0          # break here before leaving...
        else
          # nothing to do. skipped.
        end
        if @stop_next == 0 or check_break_points(file, nil, line, binding, id)
          @no_step = nil
          suspend_all
          debug_command(file, line, id, binding)
        end

      when 'call'
        @frames.unshift [binding, file, line, id]
        if check_break_points(file, klass, id.id2name, binding, id)
          suspend_all
          debug_command(file, line, id, binding)
        end

      when 'c-call'
        frame_set_pos(file, line)

      when 'class'
        @frames.unshift [binding, file, line, id]

      when 'return', 'end'
        if @frames.size == @finish_pos
          @stop_next = 1
          @finish_pos = 0
        end
        @frames.shift

      when 'raise'
        excn_handle(file, line, id, binding)

      end
      @last_file = file
    end