goog.debug.Trace_.prototype.stopTracer = function()

in asdoc/library/closure/goog/debug/tracer.js [570:640]
64 lines of code
12 McCabe index (conditional complexity)

goog.debug.Trace_.prototype.stopTracer = function(id, opt_silenceThreshold) {
  // this used to call goog.isDef(opt_silenceThreshold) but that causes an
  // object allocation in IE for some reason (doh!). The following code doesn't
  // cause an allocation
  var now = goog.debug.Trace_.now();
  var silenceThreshold;
  if (opt_silenceThreshold === 0) {
    silenceThreshold = 0;
  } else if (opt_silenceThreshold) {
    silenceThreshold = opt_silenceThreshold;
  } else {
    silenceThreshold = this.defaultThreshold_;
  }

  var startEvent = this.outstandingEvents_.get(String(id));
  if (startEvent == null) {
    return null;
  }
  goog.asserts.assertNumber(id);
  if (this.traceCallbacks_.stop) {
    this.traceCallbacks_.stop(Number(id), goog.debug.Trace_.NORMAL_STOP_);
  }

  this.outstandingEvents_.remove(String(id));

  var stopEvent;
  var elapsed = now - startEvent.startTime;
  if (elapsed < silenceThreshold) {
    var count = this.events_.length;
    for (var i = count - 1; i >= 0; i--) {
      var nextEvent = this.events_[i];
      if (nextEvent == startEvent) {
        this.events_.splice(i, 1);
        this.idPool_.releaseObject(startEvent.id);
        this.eventPool_.releaseObject(/** @type {Object} */ (startEvent));
        break;
      }
    }
  } else {
    stopEvent =
        /** @type {goog.debug.Trace_.Event_} */ (this.eventPool_.getObject());
    stopEvent.id = undefined;
    stopEvent.eventType = goog.debug.Trace_.EventType.STOP;
    stopEvent.startTime = startEvent.startTime;
    stopEvent.comment = startEvent.comment;
    stopEvent.type = startEvent.type;
    stopEvent.stopTime = stopEvent.eventTime = now;

    this.events_.push(stopEvent);
  }

  var type = startEvent.type;
  var stat = null;
  if (type) {
    stat = this.getStat_(type);
    stat.count++;
    stat.time += elapsed;
  }
  if (stopEvent) {
    goog.debug.Logger.logToProfilers('Stop : ' + stopEvent.comment);

    stopEvent.totalVarAlloc = this.getTotalVarAlloc();

    if (stat) {
      stat.varAlloc += (stopEvent.totalVarAlloc - startEvent.totalVarAlloc);
    }
  }
  var tracerFinishTime = goog.debug.Trace_.now();
  this.tracerOverheadEnd_ += tracerFinishTime - now;
  return elapsed;
};