*** old/src/share/vm/services/memPtr.hpp	Wed Oct 31 11:57:28 2012
--- new/src/share/vm/services/memPtr.hpp	Wed Oct 31 11:57:26 2012

*** 297,318 ****
--- 297,329 ----
    inline bool is_same_region(const MemPointerRecord* other) const {
      return (addr() == other->addr() && size() == other->size());
    }
  
    // if this memory region fully contains another one
!   inline bool contains_region(const MemPointerRecord* other) const {
!     return contains_region(other->addr(), other->size());
!   inline bool contain_region(const MemPointerRecord* other) const {
!     return contain_region(other->addr(), other->size());
    }
  
    // if this memory region fully contains specified memory range
!   inline bool contains_region(address add, size_t sz) const {
!   inline bool contain_region(address add, size_t sz) const {
      return (addr() <= add && addr() + size() >= add + sz);
    }
  
!   inline bool contains_address(address add) const {
!   inline bool contain_address(address add) const {
      return (addr() <= add && addr() + size() > add);
    }
+ 
+   // if this memory region overlaps another region
+   inline bool overlap_region(const MemPointerRecord* other) const {
+     assert(other != NULL, "Just check");
+     assert(size() > 0 && other->size() > 0, "empty range");
+     return contain_address(other->addr()) ||
+            contain_address(other->addr() + other->size() - 1) || // exclude end address
+            other->contain_address(addr()) ||
+            other->contain_address(addr() + size() - 1); // exclude end address
+   }
+ 
  };
  
  // MemPointerRecordEx also records callsite pc, from where
  // the memory block is allocated
  class MemPointerRecordEx : public MemPointerRecord {