1 /*

     2  * Copyright 1997-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any 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 #ifndef PRODUCT

    71  public:

    72   // Printing

    73   void oop_print_on      (oop obj, outputStream* st);

    74   void oop_print_value_on(oop obj, outputStream* st);

    75 #endif

    76 

    77  public:

    78   // Verification

    79   const char* internal_name() const;

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

    81 };