Oilpan: catch some self-referential leaks (main thread.)

Source/platform/heap/ThreadState.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 634 matching lines @@
         return m_heaps[heapIndex];
     }
     BaseHeap* expandedVectorBackingHeap(size_t gcInfoIndex);
     static bool isVectorHeapIndex(int heapIndex)
     {
         return Vector1HeapIndex <= heapIndex && heapIndex <= Vector4HeapIndex;
     }
     void allocationPointAdjusted(int heapIndex);
     void promptlyFreed(size_t gcInfoIndex);
 
+#if ENABLE(ASSERT)
+    static void incrementSelfKeepAliveAllocations();
+    static void decrementSelfKeepAliveAllocations();
+#endif
+
 private:
     enum SnapshotType {
         HeapSnapshot,
         FreelistSnapshot
     };
 
     ThreadState();
     ~ThreadState();
 
     NO_SANITIZE_ADDRESS void copyStackUntilSafePointScope();
@@ skipping 56 matching lines @@
     const InterruptorVector& interruptors() const { return m_interruptors; }
 
     friend class SafePointAwareMutexLocker;
     friend class SafePointBarrier;
     friend class SafePointScope;
 
     static WTF::ThreadSpecific<ThreadState*>* s_threadSpecific;
     static uintptr_t s_mainThreadStackStart;
     static uintptr_t s_mainThreadUnderestimatedStackSize;
     static SafePointBarrier* s_safePointBarrier;
+#if ENABLE(ASSERT)
+    static int s_selfKeepAliveAllocationsOnMainThread;
+#endif
 
     // We can't create a static member of type ThreadState here
     // because it will introduce global constructor and destructor.
     // We would like to manage lifetime of the ThreadState attached
     // to the main thread explicitly instead and still use normal
     // constructor and destructor for the ThreadState class.
     // For this we reserve static storage for the main ThreadState
     // and lazily construct ThreadState in it using placement new.
     static uint8_t s_mainThreadStateStorage[];
 
@@ skipping 62 matching lines @@
 };
 
 template<> class ThreadStateFor<AnyThread> {
 public:
     static ThreadState* state() { return ThreadState::current(); }
 };
 
 } // namespace blink
 
 #endif // ThreadState_h