8304919: Implementation of Virtual Threads

Reviewed-by: lmesnik, cjplummer, psandoz, mchung, sspitsyn, jpai

Author: Alan Bateman

src/hotspot/share/classfile/javaClasses.cpp

@@ -1498,11 +1498,9 @@ JavaThreadStatus java_lang_Thread_FieldHolder::get_thread_status(oop holder) {
 
 
 int java_lang_Thread_Constants::_static_VTHREAD_GROUP_offset = 0;
-int java_lang_Thread_Constants::_static_NOT_SUPPORTED_CLASSLOADER_offset = 0;
 
 #define THREAD_CONSTANTS_STATIC_FIELDS_DO(macro) \
-  macro(_static_VTHREAD_GROUP_offset,             k, "VTHREAD_GROUP",             threadgroup_signature, true); \
-  macro(_static_NOT_SUPPORTED_CLASSLOADER_offset, k, "NOT_SUPPORTED_CLASSLOADER", classloader_signature, true);
+  macro(_static_VTHREAD_GROUP_offset,             k, "VTHREAD_GROUP",             threadgroup_signature, true);
 
 void java_lang_Thread_Constants::compute_offsets() {
   assert(_static_VTHREAD_GROUP_offset == 0, "offsets should be initialized only once");
@@ -1523,11 +1521,6 @@ oop java_lang_Thread_Constants::get_VTHREAD_GROUP() {
   return base->obj_field(_static_VTHREAD_GROUP_offset);
 }
 
-oop java_lang_Thread_Constants::get_NOT_SUPPORTED_CLASSLOADER() {
-  InstanceKlass* k = vmClasses::Thread_Constants_klass();
-  oop base = k->static_field_base_raw();
-  return base->obj_field(_static_NOT_SUPPORTED_CLASSLOADER_offset);
-}
 
 int java_lang_Thread::_holder_offset;
 int java_lang_Thread::_name_offset;

src/hotspot/share/classfile/javaClasses.hpp

@@ -475,7 +475,6 @@ class java_lang_Thread_Constants : AllStatic {
 
  public:
   static oop get_VTHREAD_GROUP();
-  static oop get_NOT_SUPPORTED_CLASSLOADER();
 
   friend class JavaClasses;
 };