src/hotspot/share/oops/instanceClassLoaderKlass.hpp

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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#ifndef SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP
#define SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP

#include "gc/shared/specialized_oop_closures.hpp"
#include "oops/instanceKlass.hpp"
#include "utilities/macros.hpp"

class ClassFileParser;

// An InstanceClassLoaderKlass is a specialization of the InstanceKlass. It does
// not add any field.  It is added to walk the dependencies for the class loader
// key that this class loader points to.  This is how the loader_data graph is
// walked and dependant class loaders are kept alive.  I thought we walked
// the list later?

class InstanceClassLoaderKlass: public InstanceKlass {
  friend class VMStructs;
  friend class InstanceKlass;
 private:
  InstanceClassLoaderKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_class_loader) {}

public:
  InstanceClassLoaderKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }

  // GC specific object visitors
  //
#if INCLUDE_PARALLELGC
  // Parallel Scavenge
  void oop_ps_push_contents(  oop obj, PSPromotionManager* pm);
  // Parallel Compact
  void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
  void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
#endif

  // Oop fields (and metadata) iterators
  //  [nv = true]  Use non-virtual calls to do_oop_nv.
  //  [nv = false] Use virtual calls to do_oop.
  //
  // The InstanceClassLoaderKlass iterators also visit the CLD pointer (or mirror of anonymous klasses.)

 private:
  // Forward iteration
  // Iterate over the oop fields and metadata.
  template <bool nv, class OopClosureType>
  inline void oop_oop_iterate(oop obj, OopClosureType* closure);

#if INCLUDE_OOP_OOP_ITERATE_BACKWARDS
  // Reverse iteration
  // Iterate over the oop fields and metadata.
  template <bool nv, class OopClosureType>
  inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
#endif

  // Bounded range iteration
  // Iterate over the oop fields and metadata.
  template <bool nv, class OopClosureType>
  inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);

 public:

  ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
  ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)

#if INCLUDE_OOP_OOP_ITERATE_BACKWARDS
  ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
  ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
#endif

};

#endif // SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP