trace_func

# File lib/debug.rb, line 710
  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 'end'
      @frames.shift

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

    end
    @last_file = file
  end