--- old/src/share/vm/services/memPtr.hpp	2012-10-31 11:57:28.011797000 -0400
+++ new/src/share/vm/services/memPtr.hpp	2012-10-31 11:57:26.848933000 -0400
@@ -299,18 +299,29 @@
   }
 
   // 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