src/hotspot/share/classfile/placeholders.cpp

@@ -59,10 +59,12 @@
  // For bootclasssearchpath, set before calling load_instance_class.
  // Defining must be single threaded on a class/classloader basis
  // For DEFINE_CLASS, the head of the queue owns the
  // define token and the rest of the threads wait to return the
  // result the first thread gets.
+ // For INLINE_FIELD, set when loading inline type fields for
+ // class circularity checking.
  class SeenThread: public CHeapObj<mtInternal> {
  private:
     JavaThread* _thread;
     SeenThread* _stnext;
     SeenThread* _stprev;

@@ -99,10 +101,13 @@
         queuehead = _superThreadQ;
         break;
      case PlaceholderTable::DEFINE_CLASS:
         queuehead = _defineThreadQ;
         break;
+     case PlaceholderTable::PRIMITIVE_OBJECT_FIELD:
+        queuehead = _inlineTypeFieldQ;
+        break;
      default: Unimplemented();
    }
    return queuehead;
  }
  

@@ -115,10 +120,13 @@
         _superThreadQ = seenthread;
         break;
      case PlaceholderTable::DEFINE_CLASS:
         _defineThreadQ = seenthread;
         break;
+     case PlaceholderTable::PRIMITIVE_OBJECT_FIELD:
+        _inlineTypeFieldQ = seenthread;
+        break;
      default: Unimplemented();
    }
    return;
  }
  

@@ -229,10 +237,11 @@
  static const char* action_to_string(PlaceholderTable::classloadAction action) {
    switch (action) {
    case PlaceholderTable::LOAD_INSTANCE: return "LOAD_INSTANCE";
    case PlaceholderTable::LOAD_SUPER:    return "LOAD_SUPER";
    case PlaceholderTable::DEFINE_CLASS:  return "DEFINE_CLASS";
+   case PlaceholderTable::PRIMITIVE_OBJECT_FIELD: return "PRIMITIVE_OBJECT_FIELD";
   }
   return "";
  }
  
  inline void log(Symbol* name, PlaceholderEntry* entry, const char* function, PlaceholderTable::classloadAction action) {

@@ -292,11 +301,12 @@
    if (probe != NULL) {
      log(name, probe, "find_and_remove", action);
      probe->remove_seen_thread(thread, action);
      // If no other threads using this entry, and this thread is not using this entry for other states
      if ((probe->superThreadQ() == NULL) && (probe->loadInstanceThreadQ() == NULL)
-         && (probe->defineThreadQ() == NULL) && (probe->definer() == NULL)) {
+         && (probe->defineThreadQ() == NULL) && (probe->definer() == NULL)
+         && (probe->inlineTypeFieldQ() == NULL)) {
        probe->clear_supername();
        remove_entry(name, loader_data);
      }
    }
  }

@@ -328,10 +338,13 @@
    superThreadQ()->print_action_queue(st);
    st->cr();
    st->print("defineThreadQ threads:");
    defineThreadQ()->print_action_queue(st);
    st->cr();
+   st->print("inlineTypeFieldQ threads:");
+   inlineTypeFieldQ()->print_action_queue(st);
+   st->cr();
  }
  
  void PlaceholderTable::print_on(outputStream* st) {
    auto printer = [&] (PlaceholderKey& key, PlaceholderEntry& entry) {
        st->print("placeholder ");