tor-browser

The Tor Browser
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StringifyUtils.cpp (1712B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/quota/StringifyUtils.h"
      8 
      9 #include "mozilla/ThreadLocal.h"
     10 #include "nsTHashSet.h"
     11 
     12 namespace mozilla {
     13 
     14 MOZ_THREAD_LOCAL(nsTHashSet<Stringifyable*>*)
     15 Stringifyable::sActiveStringifyableInstances;
     16 
     17 #ifdef DEBUG
     18 Atomic<bool> sStringifyableTLSInitialized(false);
     19 #endif
     20 
     21 void Stringifyable::Stringify(nsACString& aData) {
     22  if (IsActive()) {
     23    aData.Append("(...)"_ns);
     24    return;
     25  }
     26 
     27  SetActive(true);
     28  aData.Append(kStringifyStartInstance);
     29  DoStringify(aData);
     30  aData.Append(kStringifyEndInstance);
     31  SetActive(false);
     32 }
     33 
     34 /* static */ void Stringifyable::InitTLS() {
     35  if (sActiveStringifyableInstances.init()) {
     36 #ifdef DEBUG
     37    sStringifyableTLSInitialized = true;
     38 #endif
     39  }
     40 }
     41 
     42 bool Stringifyable::IsActive() {
     43  MOZ_ASSERT(sStringifyableTLSInitialized);
     44  auto* set = sActiveStringifyableInstances.get();
     45  return set && set->Contains(this);
     46 }
     47 
     48 void Stringifyable::SetActive(bool aIsActive) {
     49  MOZ_ASSERT(sStringifyableTLSInitialized);
     50  auto* myset = sActiveStringifyableInstances.get();
     51  if (!myset && aIsActive) {
     52    myset = new nsTHashSet<Stringifyable*>();
     53    sActiveStringifyableInstances.set(myset);
     54  }
     55  MOZ_ASSERT(myset);
     56  if (aIsActive) {
     57    myset->Insert(this);
     58  } else {
     59    myset->Remove(this);
     60    if (myset->IsEmpty()) {
     61      sActiveStringifyableInstances.set(nullptr);
     62      delete myset;
     63    }
     64  }
     65 }
     66 
     67 }  // namespace mozilla