*** old/src/share/vm/opto/library_call.cpp	Mon Aug 19 07:39:09 2013
--- new/src/share/vm/opto/library_call.cpp	Mon Aug 19 07:39:09 2013

*** 3681,3690 ****
--- 3681,3692 ----
  // Helper for hashCode and clone.  Peeks inside the vtable to avoid a call.
  Node* LibraryCallKit::generate_virtual_guard(Node* obj_klass,
                                               RegionNode* slow_region) {
    ciMethod* method = callee();
    int vtable_index = method->vtable_index();
+   assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index,
+          err_msg_res("bad index %d", vtable_index));
    // Get the Method* out of the appropriate vtable entry.
    int entry_offset  = (InstanceKlass::vtable_start_offset() +
                       vtable_index*vtableEntry::size()) * wordSize +
                       vtableEntry::method_offset_in_bytes();
    Node* entry_addr  = basic_plus_adr(obj_klass, entry_offset);

*** 3731,3740 ****
--- 3733,3744 ----
      } else {
        // hashCode and clone are not a miranda methods,
        // so the vtable index is fixed.
        // No need to use the linkResolver to get it.
         vtable_index = method->vtable_index();
+        assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index,
+               err_msg_res("bad index %d", vtable_index));
      }
      slow_call = new(C) CallDynamicJavaNode(tf,
                            SharedRuntime::get_resolve_virtual_call_stub(),
                            method, vtable_index, bci());
    } else {  // neither virtual nor static:  opt_virtual