Invalidate cross-thread persistents on heap termination.

Source/platform/heap/HeapTest.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 481 matching lines @@
 };
 
 class ThreadedHeapTester : public ThreadedTesterBase {
 public:
     static void test()
     {
         ThreadedTesterBase::test(new ThreadedHeapTester);
     }
 
 protected:
+    using GlobalIntWrapperPersistent = CrossThreadPersistent<IntWrapper>;
+
+    PassOwnPtr<GlobalIntWrapperPersistent> createGlobalPersistent(int value)
+    {
+        return adoptPtr(new GlobalIntWrapperPersistent(IntWrapper::create(value)));
+    }
+
     void runThread() override
     {
+        OwnPtr<GlobalIntWrapperPersistent> longLivingPersistent;
         ThreadState::attach();
 
+        longLivingPersistent = createGlobalPersistent(0x2a2a2a2a);
         int gcCount = 0;
         while (!done()) {
             ThreadState::current()->safePoint(ThreadState::NoHeapPointersOnStack);
             {
                 Persistent<IntWrapper> wrapper;
 
-                typedef CrossThreadPersistent<IntWrapper> GlobalIntWrapperPersistent;
-                OwnPtr<GlobalIntWrapperPersistent> globalPersistent = adoptPtr(new GlobalIntWrapperPersistent(IntWrapper::create(0x0ed0cabb)));
+                OwnPtr<GlobalIntWrapperPersistent> globalPersistent = createGlobalPersistent(0x0ed0cabb);
 
                 for (int i = 0; i < numberOfAllocations; i++) {
                     wrapper = IntWrapper::create(0x0bbac0de);
                     if (!(i % 10)) {
-                        globalPersistent = adoptPtr(new GlobalIntWrapperPersistent(IntWrapper::create(0x0ed0cabb)));
+                        globalPersistent = createGlobalPersistent(0x0ed0cabb);
                     }
                     SafePointScope scope(ThreadState::NoHeapPointersOnStack);
                     Platform::current()->yieldCurrentThread();
                 }
 
                 if (gcCount < gcPerThread) {
                     Heap::collectGarbage(ThreadState::NoHeapPointersOnStack, ThreadState::GCWithSweep, Heap::ForcedGC);
                     gcCount++;
                     atomicIncrement(&m_gcCount);
                 }
 
                 // Taking snapshot shouldn't have any bad side effect.
                 // TODO(haraken): This snapshot GC causes crashes, so disable
                 // it at the moment. Fix the crash and enable it.
                 // Heap::collectGarbage(ThreadState::NoHeapPointersOnStack, ThreadState::TakeSnapshot, Heap::ForcedGC);
                 Heap::collectGarbage(ThreadState::NoHeapPointersOnStack, ThreadState::GCWithSweep, Heap::ForcedGC);
                 EXPECT_EQ(wrapper->value(), 0x0bbac0de);
                 EXPECT_EQ((*globalPersistent)->value(), 0x0ed0cabb);
             }
             SafePointScope scope(ThreadState::NoHeapPointersOnStack);
             Platform::current()->yieldCurrentThread();
         }
+
+        // Intentionally leak the cross-thread persistent so as to verify
+        // that later GCs correctly handle cross-thread persistents that
+        // refer to finalized objects after their heaps have been detached
+        // and freed.
+        EXPECT_TRUE(longLivingPersistent.leakPtr());
+
         ThreadState::detach();
         atomicDecrement(&m_threadsToFinish);
     }
 };
 
 class ThreadedWeaknessTester : public ThreadedTesterBase {
 public:
     static void test()
     {
         ThreadedTesterBase::test(new ThreadedWeaknessTester);
@@ skipping 5722 matching lines @@
 {
     Persistent<ClassWithMember> object = ClassWithMember::create();
     EXPECT_EQ(0, object->traceCount());
     TestMixinAllocatingObject* mixin = TestMixinAllocatingObject::create(object.get());
     EXPECT_TRUE(mixin);
     EXPECT_GT(object->traceCount(), 0);
     EXPECT_GT(mixin->traceCount(), 0);
 }
 
 } // namespace blink