src/hotspot/share/oops/klassVtable.cpp

*** 1228,14 ***
    initialize_itable(supers);
    check_constraints(supers, CHECK);
  }
  
  inline bool interface_method_needs_itable_index(Method* m) {
!   if (m->is_static())             return false; // e.g., Stream.empty
!   if (m->is_object_initializer()) return false; // <init>
!   if (m->is_static_initializer()) return false; // <clinit>
!   if (m->is_private())            return false; // uses direct call
    // If an interface redeclares a method from java.lang.Object,
    // it should already have a vtable index, don't touch it.
    // e.g., CharSequence.toString (from initialize_vtable)
    // if (m->has_vtable_index())  return false; // NO!
    return true;
--- 1228,14 ---
    initialize_itable(supers);
    check_constraints(supers, CHECK);
  }
  
  inline bool interface_method_needs_itable_index(Method* m) {
!   if (m->is_static())             return false;   // e.g., Stream.empty
!   if (m->is_private())            return false;   // uses direct call
!   if (m->is_object_constructor()) return false;   // <init>(...)V
!   if (m->is_class_initializer())  return false;   // <clinit>()V
    // If an interface redeclares a method from java.lang.Object,
    // it should already have a vtable index, don't touch it.
    // e.g., CharSequence.toString (from initialize_vtable)
    // if (m->has_vtable_index())  return false; // NO!
    return true;

*** 1440,10 ***
--- 1440,22 ---
  class InterfaceVisiterClosure : public StackObj {
   public:
    virtual void doit(InstanceKlass* intf, int method_count) = 0;
  };
  
+ int count_interface_methods_needing_itable_index(Array<Method*>* methods) {
+   int method_count = 0;
+   if (methods->length() > 0) {
+     for (int i = methods->length(); --i >= 0; ) {
+       if (interface_method_needs_itable_index(methods->at(i))) {
+         method_count++;
+       }
+     }
+   }
+   return method_count;
+ }
+ 
  // Visit all interfaces with at least one itable method
  static void visit_all_interfaces(Array<InstanceKlass*>* transitive_intf, InterfaceVisiterClosure *blk) {
    // Handle array argument
    for(int i = 0; i < transitive_intf->length(); i++) {
      InstanceKlass* intf = transitive_intf->at(i);