src/hotspot/share/oops/klass.cpp

Access_GetLoadedClasses

*** 33,42 ****
--- 33,43 ----
  #include "memory/metadataFactory.hpp"
  #include "memory/metaspaceClosure.hpp"
  #include "memory/metaspaceShared.hpp"
  #include "memory/oopFactory.hpp"
  #include "memory/resourceArea.hpp"
+ #include "oops/access.inline.hpp"
  #include "oops/instanceKlass.hpp"
  #include "oops/klass.inline.hpp"
  #include "oops/oop.inline.hpp"
  #include "runtime/atomic.hpp"
  #include "runtime/orderAccess.inline.hpp"
***************
*** 52,61 ****
--- 53,74 ----
  
  oop Klass::java_mirror() const {
    return _java_mirror.resolve();
  }
  
+ oop Klass::java_mirror_phantom() {
+   // Loading the klass_holder as a phantom oop ref keeps the class alive.
+   // After the holder has been kept alive, it is safe to return the mirror.
+   (void)klass_holder_phantom();
+   return java_mirror();
+ }
+ 
+ oop Klass::klass_holder_phantom() {
+   oop* addr = &class_loader_data()->_class_loader;
+   return RootAccess<IN_CONCURRENT_ROOT | ON_PHANTOM_OOP_REF>::oop_load(addr);
+ }
+ 
  bool Klass::is_cloneable() const {
    return _access_flags.is_cloneable_fast() ||
           is_subtype_of(SystemDictionary::Cloneable_klass());
  }