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Minimal test - lines (139, 139)

Code

nsObserverService::~nsObserverService(void) { Shutdown(); }

Minimal test - lines (137, 137)

Code

nsObserverService::nsObserverService() : mShuttingDown(false) {}

Minimal test - lines (45, 129)

Code

nsObserverService::CollectReports(nsIHandleReportCallback* aHandleReport,
                                  nsISupports* aData, bool aAnonymize) {
  struct SuspectObserver {
    SuspectObserver(const char* aTopic, size_t aReferentCount)
        : mTopic(aTopic), mReferentCount(aReferentCount) {}
    const char* mTopic;
    size_t mReferentCount;
  };

  size_t totalNumStrong = 0;
  size_t totalNumWeakAlive = 0;
  size_t totalNumWeakDead = 0;
  nsTArray suspectObservers;

  for (auto iter = mObserverTopicTable.Iter(); !iter.Done(); iter.Next()) {
    nsObserverList* observerList = iter.Get();
    if (!observerList) {
      continue;
    }

    size_t topicNumStrong = 0;
    size_t topicNumWeakAlive = 0;
    size_t topicNumWeakDead = 0;

    nsMaybeWeakPtrArray& observers = observerList->mObservers;
    for (uint32_t i = 0; i < observers.Length(); i++) {
      if (observers[i].IsWeak()) {
        nsCOMPtr ref = observers[i].GetValue();
        if (ref) {
          topicNumWeakAlive++;
        } else {
          topicNumWeakDead++;
        }
      } else {
        topicNumStrong++;
      }
    }

    totalNumStrong += topicNumStrong;
    totalNumWeakAlive += topicNumWeakAlive;
    totalNumWeakDead += topicNumWeakDead;

    // Keep track of topics that have a suspiciously large number
    // of referents (symptom of leaks).
    size_t topicTotal = topicNumStrong + topicNumWeakAlive + topicNumWeakDead;
    if (topicTotal > kSuspectReferentCount) {
      SuspectObserver suspect(observerList->GetKey(), topicTotal);
      suspectObservers.AppendElement(suspect);
    }
  }

  // These aren't privacy-sensitive and so don't need anonymizing.
  for (uint32_t i = 0; i < suspectObservers.Length(); i++) {
    SuspectObserver& suspect = suspectObservers[i];
    nsPrintfCString suspectPath("observer-service-suspect/referent(topic=%s)",
                                suspect.mTopic);
    aHandleReport->Callback(
        /* process */ ""_ns, suspectPath, KIND_OTHER, UNITS_COUNT,
        suspect.mReferentCount,
        nsLiteralCString("A topic with a suspiciously large number of "
                         "referents.  This may be symptomatic of a leak "
                         "if the number of referents is high with "
                         "respect to the number of windows."),
        aData);
  }

  MOZ_COLLECT_REPORT(
      "observer-service/referent/strong", KIND_OTHER, UNITS_COUNT,
      totalNumStrong,
      "The number of strong references held by the observer service.");

  MOZ_COLLECT_REPORT(
      "observer-service/referent/weak/alive", KIND_OTHER, UNITS_COUNT,
      totalNumWeakAlive,
      "The number of weak references held by the observer service that are "
      "still alive.");

  MOZ_COLLECT_REPORT(
      "observer-service/referent/weak/dead", KIND_OTHER, UNITS_COUNT,
      totalNumWeakDead,
      "The number of weak references held by the observer service that are "
      "dead.");

  return NS_OK;
}