Revert "Revert of [oilpan]: optimize the way we allocate persistent handles in wrappers. (patchset …

Source/platform/heap/ThreadState.h

Index: Source/platform/heap/ThreadState.h
diff --git a/Source/platform/heap/ThreadState.h b/Source/platform/heap/ThreadState.h
index f8be43aba42d510bd6d352964412105c38067e25..53c0cd0966d49515658d45e0fabc745391f485d3 100644
--- a/Source/platform/heap/ThreadState.h
+++ b/Source/platform/heap/ThreadState.h
@@ -56,6 +56,7 @@ class HeapContainsCache;
 class HeapObjectHeader;
 class PageMemory;
 class PersistentNode;
+class WrapperPersistentRegion;
 class Visitor;
 class SafePointBarrier;
 class SafePointAwareMutexLocker;
@@ -546,6 +547,14 @@ public:
     BaseHeapPage* contains(void* pointer) { return contains(reinterpret_cast<Address>(pointer)); }
     BaseHeapPage* contains(const void* pointer) { return contains(const_cast<void*>(pointer)); }
 
+    WrapperPersistentRegion* wrapperRoots() const
+    {
+        ASSERT(m_liveWrapperPersistents);
+        return m_liveWrapperPersistents;
+    }
+    WrapperPersistentRegion* takeWrapperPersistentRegion();
+    void freeWrapperPersistentRegion(WrapperPersistentRegion*);
+
     // List of persistent roots allocated on the given thread.
     PersistentNode* roots() const { return m_persistents.get(); }
 
@@ -670,6 +679,9 @@ private:
     static uint8_t s_mainThreadStateStorage[];
 
     ThreadIdentifier m_thread;
+    WrapperPersistentRegion* m_liveWrapperPersistents;
+    WrapperPersistentRegion* m_pooledWrapperPersistents;
+    size_t m_pooledWrapperPersistentRegionCount;
     OwnPtr<PersistentNode> m_persistents;
     StackState m_stackState;
     intptr_t* m_startOfStack;