1 /*
   2  * Copyright (c) 1997, 2006, 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 // A klassKlass serves as the fix point of the klass chain.
  26 // The klass of klassKlass is itself.
  27 
  28 class klassKlass: public Klass {
  29   friend class VMStructs;
  30  private:
  31   juint    _alloc_size;        // allocation profiling support
  32  public:
  33   // Testing
  34   bool oop_is_klass()  const { return true; }
  35   bool is_leaf_class() const { return true; }
  36 
  37   // Sizing
  38   int oop_size(oop obj) const;
  39   int klass_oop_size() const { return object_size(); }
  40 
  41   // Allocation
  42   DEFINE_ALLOCATE_PERMANENT(klassKlass);
  43   static klassOop create_klass(TRAPS );
  44 
  45   // Casting from klassOop
  46   static klassKlass* cast(klassOop k) {
  47     assert(k->klass_part()->oop_is_klass(), "cast to klassKlass");
  48     return (klassKlass*) k->klass_part();
  49   }
  50 
  51   // Sizing
  52   static int header_size()  { return oopDesc::header_size() + sizeof(klassKlass)/HeapWordSize; }
  53   int object_size() const   { return align_object_size(header_size()); }
  54 
  55   // Garbage collection
  56   void oop_follow_contents(oop obj);
  57   int  oop_adjust_pointers(oop obj);
  58 
  59   // Parallel Scavenge and Parallel Old
  60   PARALLEL_GC_DECLS
  61 
  62   // Iterators
  63   int  oop_oop_iterate(oop obj, OopClosure* blk);
  64   int  oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
  65 
  66   // Allocation profiling support
  67   juint alloc_size() const              { return _alloc_size; }
  68   void set_alloc_size(juint n)          { _alloc_size = n; }
  69 
  70   // Printing
  71   void oop_print_value_on(oop obj, outputStream* st);
  72   void oop_print_on      (oop obj, outputStream* st);
  73 
  74   // Verification
  75   const char* internal_name() const;
  76   void oop_verify_on(oop obj, outputStream* st);
  77 };