Release Oilpan heap singletons prior to LSan leak detection.

third_party/WebKit/Source/platform/heap/ThreadState.cpp

 /*
  * 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 86 matching lines @@
     , m_vectorBackingHeapIndex(BlinkGC::Vector1HeapIndex)
     , m_currentHeapAges(0)
     , m_isTerminating(false)
     , m_gcMixinMarker(nullptr)
     , m_shouldFlushHeapDoesNotContainCache(false)
     , m_gcState(NoGCScheduled)
     , m_traceDOMWrappers(nullptr)
 #if defined(ADDRESS_SANITIZER)
     , m_asanFakeStack(__asan_get_current_fake_stack())
 #endif
+#if defined(LEAK_SANITIZER)
+    , m_disabledStaticPersistentsRegistration(0)
+#endif
 {
     ASSERT(checkThread());
     ASSERT(!**s_threadSpecific);
     **s_threadSpecific = this;
 
     if (isMainThread()) {
         s_mainThreadStackStart = reinterpret_cast<uintptr_t>(m_startOfStack) - sizeof(void*);
         size_t underestimatedStackSize = StackFrameDepth::getUnderestimatedStackSize();
         if (underestimatedStackSize > sizeof(void*))
             s_mainThreadUnderestimatedStackSize = underestimatedStackSize - sizeof(void*);
@@ skipping 1193 matching lines @@
     ASSERT(checkThread());
     SafePointScope scope(BlinkGC::HeapPointersOnStack);
     {
         MutexLocker locker(threadAttachMutex());
         size_t index = m_interruptors.find(interruptor);
         RELEASE_ASSERT(index != kNotFound);
         m_interruptors.remove(index);
     }
 }
 
+#if defined(LEAK_SANITIZER)
+void ThreadState::registerStaticPersistentNode(PersistentNode* node)
+{
+    if (m_disabledStaticPersistentsRegistration)
+        return;
+
+    ASSERT(!m_staticPersistents.contains(node));
+    m_staticPersistents.add(node);
+}
+
+void ThreadState::releaseStaticPersistentNodes()
+{
+    for (PersistentNode* node : m_staticPersistents)
+        persistentRegion()->freePersistentNode(node);

[haraken, 2015/12/07 14:46:10]

After calling this, all static Persistent handles become stale pointers (i.e.,
pointing to freed persistent nodes). This is intentional, right?

I think this would be okay because this happens only when we shut down a
renderer with LSan enabled. It won't cause any practical issue.

[sof, 2015/12/07 16:59:17]

Intentional to handle it that way; the sweeping phase will poison what the
persistent points to via m_raw, so any attempted uses will be caught.

+
+    m_staticPersistents.clear();
+}
+
+void ThreadState::enterStaticReferenceRegistrationDisabledScope()
+{
+    m_disabledStaticPersistentsRegistration++;
+}
+
+void ThreadState::leaveStaticReferenceRegistrationDisabledScope()
+{
+    ASSERT(m_disabledStaticPersistentsRegistration);
+    m_disabledStaticPersistentsRegistration--;
+}
+#endif
+
 ThreadState::AttachedThreadStateSet& ThreadState::attachedThreads()
 {
     DEFINE_STATIC_LOCAL(AttachedThreadStateSet, threads, ());
     return threads;
 }
 
 void ThreadState::lockThreadAttachMutex()
 {
     threadAttachMutex().lock();
 }
@@ skipping 153 matching lines @@
     threadDump->addScalar("dead_count", "objects", totalDeadCount);
     threadDump->addScalar("live_size", "bytes", totalLiveSize);
     threadDump->addScalar("dead_size", "bytes", totalDeadSize);
 
     WebMemoryAllocatorDump* heapsDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(heapsDumpName);
     WebMemoryAllocatorDump* classesDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(classesDumpName);
     BlinkGCMemoryDumpProvider::instance()->currentProcessMemoryDump()->addOwnershipEdge(classesDump->guid(), heapsDump->guid());
 }
 
 } // namespace blink