1 /*
   2  * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 // An instanceKlassKlass is the klass of an instanceKlass
  26 
  27 class instanceKlassKlass : public klassKlass {
  28  public:
  29   // Dispatched operation
  30   bool oop_is_klass() const           { return true; }
  31   bool oop_is_instanceKlass() const   { return true; }
  32 
  33   int oop_size(oop obj) const;
  34   int klass_oop_size() const    { return object_size(); }
  35 
  36   // Allocation
  37   DEFINE_ALLOCATE_PERMANENT(instanceKlassKlass);
  38   static klassOop create_klass(TRAPS);
  39   klassOop allocate_instance_klass(int vtable_len,
  40                                    int itable_len,
  41                                    int static_field_size,
  42                                    unsigned int nonstatic_oop_map_count,
  43                                    ReferenceType rt,
  44                                    TRAPS);
  45 
  46   // Casting from klassOop
  47   static instanceKlassKlass* cast(klassOop k) {
  48     assert(k->klass_part()->oop_is_klass(), "cast to instanceKlassKlass");
  49     return (instanceKlassKlass*) k->klass_part();
  50   }
  51 
  52   // Sizing
  53   static int header_size()    { return oopDesc::header_size() + sizeof(instanceKlassKlass)/HeapWordSize; }
  54   int object_size() const     { return align_object_size(header_size()); }
  55 
  56   // Garbage collection
  57   void oop_follow_contents(oop obj);
  58   int  oop_adjust_pointers(oop obj);
  59   bool oop_is_parsable(oop obj) const;
  60 
  61   // Parallel Scavenge and Parallel Old
  62   PARALLEL_GC_DECLS
  63 
  64   // Iterators
  65   int oop_oop_iterate(oop obj, OopClosure* blk);
  66   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
  67 
  68 private:
  69   // Apply closure to the InstanceKlass oops that are outside the java heap.
  70   inline void iterate_c_heap_oops(instanceKlass* ik, OopClosure* closure);
  71 
  72  public:
  73   // Printing
  74   void oop_print_value_on(oop obj, outputStream* st);
  75 #ifndef PRODUCT
  76   void oop_print_on(oop obj, outputStream* st);
  77 #endif
  78 
  79   // Verification
  80   const char* internal_name() const;
  81   void oop_verify_on(oop obj, outputStream* st);
  82   // tells whether obj is partially constructed (gc during class loading)
  83   bool oop_partially_loaded(oop obj) const;
  84   void oop_set_partially_loaded(oop obj);
  85 };