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 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 #ifndef nsCCUncollectableMarker_h_

 #define nsCCUncollectableMarker_h_

 #include "js/TracingAPI.h"

 #include "mozilla/Attributes.h"

 #include "nsIObserver.h"

 class nsCCUncollectableMarker MOZ_FINAL : public nsIObserver

 {

   NS_DECL_ISUPPORTS

   NS_DECL_NSIOBSERVER

   /**

    * Inits a global nsCCUncollectableMarker. Should only be called once.

    */

   static nsresult Init();

   /**

    * Checks if we're collecting during a given generation

    */

   static bool InGeneration(uint32_t aGeneration)

   {

     return aGeneration && aGeneration == sGeneration;

   }

   template <class CCCallback>

   static bool InGeneration(CCCallback& aCb, uint32_t aGeneration)

   {

     return InGeneration(aGeneration) && !aCb.WantAllTraces();

   }

   static uint32_t sGeneration;

 private:

   nsCCUncollectableMarker() {}

 };

 namespace mozilla {

 namespace dom {

 void TraceBlackJS(JSTracer* aTrc, uint32_t aGCNumber, bool aIsShutdownGC);

 }

 }

 #endif