Java example source code file (objArrayKlass.hpp)

This example Java source code file (objArrayKlass.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

all_oop_oop_iterate_closures_2, extendedoopclosure, include_all_gcs, klass, klasshandle, memregion, objarrayklass, oopclosuretype, product, share_vm_oops_objarrayklass_hpp, symbol, the, traps

The objArrayKlass.hpp Java example source code

/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * 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
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_OOPS_OBJARRAYKLASS_HPP
#define SHARE_VM_OOPS_OBJARRAYKLASS_HPP

#include "classfile/classLoaderData.hpp"
#include "memory/specialized_oop_closures.hpp"
#include "oops/arrayKlass.hpp"
#include "utilities/macros.hpp"

// ObjArrayKlass is the klass for objArrays

class ObjArrayKlass : public ArrayKlass {
  friend class VMStructs;
 private:
  Klass* _element_klass;            // The klass of the elements of this array type
  Klass* _bottom_klass;             // The one-dimensional type (InstanceKlass or TypeArrayKlass)

  // Constructor
  ObjArrayKlass(int n, KlassHandle element_klass, Symbol* name);
  static ObjArrayKlass* allocate(ClassLoaderData* loader_data, int n, KlassHandle klass_handle, Symbol* name, TRAPS);
 public:
  // For dummy objects
  ObjArrayKlass() {}

  // Instance variables
  Klass* element_klass() const      { return _element_klass; }
  void set_element_klass(Klass* k)  { _element_klass = k; }
  Klass** element_klass_addr()      { return &_element_klass; }

  Klass* bottom_klass() const       { return _bottom_klass; }
  void set_bottom_klass(Klass* k)   { _bottom_klass = k; }
  Klass** bottom_klass_addr()       { return &_bottom_klass; }

  // Compiler/Interpreter offset
  static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ObjArrayKlass, _element_klass)); }

  // Dispatched operation
  bool can_be_primary_super_slow() const;
  GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
  bool compute_is_subtype_of(Klass* k);
  bool oop_is_objArray_slow()  const  { return true; }
  int oop_size(oop obj) const;

  // Allocation
  static Klass* allocate_objArray_klass(ClassLoaderData* loader_data,
                                          int n, KlassHandle element_klass, TRAPS);

  objArrayOop allocate(int length, TRAPS);
  oop multi_allocate(int rank, jint* sizes, TRAPS);

  // Copying
  void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);

  // Compute protection domain
  oop protection_domain() const { return bottom_klass()->protection_domain(); }

 private:
  // Either oop or narrowOop depending on UseCompressedOops.
  // must be called from within ObjArrayKlass.cpp
  template <class T> void do_copy(arrayOop s, T* src, arrayOop d,
                                  T* dst, int length, TRAPS);
 protected:
  // Returns the ObjArrayKlass for n'th dimension.
  virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);

  // Returns the array class with this class as element type.
  virtual Klass* array_klass_impl(bool or_null, TRAPS);

 public:
  // Casting from Klass*
  static ObjArrayKlass* cast(Klass* k) {
    assert(k->oop_is_objArray(), "cast to ObjArrayKlass");
    return (ObjArrayKlass*) k;
  }

  // Sizing
  static int header_size()                { return sizeof(ObjArrayKlass)/HeapWordSize; }
  int size() const                        { return ArrayKlass::static_size(header_size()); }

  // Initialization (virtual from Klass)
  void initialize(TRAPS);

  // Garbage collection
  void oop_follow_contents(oop obj);
  inline void oop_follow_contents(oop obj, int index);
  template <class T> inline void objarray_follow_contents(oop obj, int index);

  int  oop_adjust_pointers(oop obj);

  // Parallel Scavenge and Parallel Old
  PARALLEL_GC_DECLS
#if INCLUDE_ALL_GCS
  inline void oop_follow_contents(ParCompactionManager* cm, oop obj, int index);
  template <class T> inline void
    objarray_follow_contents(ParCompactionManager* cm, oop obj, int index);
#endif // INCLUDE_ALL_GCS

  // Iterators
  int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
    return oop_oop_iterate_v(obj, blk);
  }
  int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
    return oop_oop_iterate_v_m(obj, blk, mr);
  }
#define ObjArrayKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)   \
  int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);         \
  int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk,      \
                                     MemRegion mr);                     \
  int oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* blk,    \
                                     int start, int end);

  ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
  ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DECL)

  // JVM support
  jint compute_modifier_flags(TRAPS) const;

 public:
  // Printing
  void print_on(outputStream* st) const;
  void print_value_on(outputStream* st) const;

  void oop_print_value_on(oop obj, outputStream* st);
#ifndef PRODUCT
  void oop_print_on      (oop obj, outputStream* st);
#endif //PRODUCT

  const char* internal_name() const;

  // Verification
  void verify_on(outputStream* st, bool check_dictionary);

  void oop_verify_on(oop obj, outputStream* st);
};

#endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP