class_docstr: Profiler class.
  
  self.cur is always a tuple.  Each such tuple corresponds to a stack
  frame that is currently active (self.cur[-2]).  The following are the
  definitions of its members.  We use this external "parallel stack" to
  avoid contaminating the program that we are profiling. (old profiler
  used to write into the frames local dictionary!!) Derived classes
  can change the definition of some entries, as long as they leave
  [-2:] intact (frame and previous tuple).  In case an internal error is
  detected, the -3 element is used as the function name.
  
  [ 0] = Time that needs to be charged to the parent frame's function.
         It is used so that a function call will not have to access the
         timing data for the parent frame.
  [ 1] = Total time spent in this frame's function, excluding time in
         subfunctions (this latter is tallied in cur[2]).
  [ 2] = Total time spent in subfunctions, excluding time executing the
         frame's function (this latter is tallied in cur[1]).
  [-3] = Name of the function that corresponds to this frame.
  [-2] = Actual frame that we correspond to (used to sync exception handling).
  [-1] = Our parent 6-tuple (corresponds to frame.f_back).
  
  Timing data for each function is stored as a 5-tuple in the dictionary
  self.timings[].  The index is always the name stored in self.cur[-3].
  The following are the definitions of the members:
  
  [0] = The number of times this function was called, not counting direct
        or indirect recursion,
  [1] = Number of times this function appears on the stack, minus one
  [2] = Total time spent internal to this function
  [3] = Cumulative time that this function was present on the stack.  In
        non-recursive functions, this is the total execution time from start
        to finish of each invocation of a function, including time spent in
        all subfunctions.
  [4] = A dictionary indicating for each function name, the number of times
        it was called by us.
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code: def snapshot_stats(self):
      self.stats = {}
      for func, (cc, ns, tt, ct, callers) in self.timings.items():
          callers = callers.copy()
          nc = 0
          for callcnt in callers.values():
              nc += callcnt
          self.stats[func] = cc, nc, tt, ct, callers
  
imports: import io
  import sys
  import time
  import marshal
label_desc: Use image node_id 16 for calling the Profile obj's underlying member method code with example usage: obj.snapshot_stats() without return types