--- old/src/share/vm/memory/allocation.hpp	Tue Aug  3 11:01:43 2010
+++ new/src/share/vm/memory/allocation.hpp	Tue Aug  3 11:01:43 2010
@@ -316,12 +316,24 @@
 // use delete to deallocate.
 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC {
  public:
-  enum allocation_type { UNKNOWN = 0, C_HEAP, RESOURCE_AREA, ARENA };
+  enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 };
 #ifdef ASSERT
  private:
-  allocation_type _allocation;
+  // When this object is allocated on stack the new() operator is not
+  // called but garbage on stack may look like a valid allocation_type.
+  // Store negated 'this' pointer when new() is called to distinguish cases.
+  uintptr_t _allocation;
  public:
-  bool allocated_on_C_heap()    { return _allocation == C_HEAP; }
+  static void set_allocation_type(address res, allocation_type type);
+  allocation_type get_allocation_type();
+  bool allocated_on_stack()     { return get_allocation_type() == STACK_OR_EMBEDDED; }
+  bool allocated_on_res_area()  { return get_allocation_type() == RESOURCE_AREA; }
+  bool allocated_on_C_heap()    { return get_allocation_type() == C_HEAP; }
+  bool allocated_on_arena()     { return get_allocation_type() == ARENA; }
+  ResourceObj(); // default construtor
+  ResourceObj(const ResourceObj& r); // default copy construtor
+  ResourceObj& operator=(const ResourceObj& r); // default copy assignment
+  virtual ~ResourceObj();
 #endif // ASSERT
 
  public:
@@ -328,20 +340,17 @@
   void* operator new(size_t size, allocation_type type);
   void* operator new(size_t size, Arena *arena) {
       address res = (address)arena->Amalloc(size);
-      // Set allocation type in the resource object
-      DEBUG_ONLY(((ResourceObj *)res)->_allocation = ARENA;)
+      DEBUG_ONLY(set_allocation_type(res, ARENA);)
       return res;
   }
   void* operator new(size_t size) {
       address res = (address)resource_allocate_bytes(size);
-      // Set allocation type in the resource object
-      DEBUG_ONLY(((ResourceObj *)res)->_allocation = RESOURCE_AREA;)
+      DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);)
       return res;
   }
   void* operator new(size_t size, void* where, allocation_type type) {
-      void* res = where;
-      // Set allocation type in the resource object
-      DEBUG_ONLY(((ResourceObj *)res)->_allocation = type;)
+      address res = (address)where;
+      DEBUG_ONLY(set_allocation_type(res, type);)
       return res;
   }
   void  operator delete(void* p);