jdk8-mips64-public/hotspot: src/share/vm/oops/instanceMirrorKlass.hpp@c7f3d0b4570f

7017732: move static fields into Class to prepare for perm gen removal
Reviewed-by: kvn, coleenp, twisti, stefank

     1 /*

     2  * Copyright (c) 2011, 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

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    23  */

    25 #ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP

    26 #define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP

    28 #include "oops/instanceKlass.hpp"

    30 // An instanceMirrorKlass is a specialized instanceKlass for

    31 // java.lang.Class instances.  These instances are special because

    32 // they contain the static fields of the class in addition to the

    33 // normal fields of Class.  This means they are variable sized

    34 // instances and need special logic for computing their size and for

    35 // iteration of their oops.

    38 class instanceMirrorKlass: public instanceKlass {

    39  private:

    40   static int _offset_of_static_fields;

    42  public:

    43   // Type testing

    44   bool oop_is_instanceMirror() const             { return true; }

    46   // Casting from klassOop

    47   static instanceMirrorKlass* cast(klassOop k) {

    48     assert(k->klass_part()->oop_is_instanceMirror(), "cast to instanceMirrorKlass");

    49     return (instanceMirrorKlass*) k->klass_part();

    50   }

    52   // Returns the size of the instance including the extra static fields.

    53   virtual int oop_size(oop obj) const;

    55   // Static field offset is an offset into the Heap, should be converted by

    56   // based on UseCompressedOop for traversal

    57   static HeapWord* start_of_static_fields(oop obj) {

    58     return (HeapWord*)((intptr_t)obj + offset_of_static_fields());

    59   }

    61   static void init_offset_of_static_fields() {

    62     // Cache the offset of the static fields in the Class instance

    63     assert(_offset_of_static_fields == 0, "once");

    64     _offset_of_static_fields = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;

    65   }

    67   static int offset_of_static_fields() {

    68     return _offset_of_static_fields;

    69   }

    71   int compute_static_oop_field_count(oop obj);

    73   // Given a Klass return the size of the instance

    74   int instance_size(KlassHandle k);

    76   // allocation

    77   DEFINE_ALLOCATE_PERMANENT(instanceMirrorKlass);

    78   instanceOop allocate_instance(KlassHandle k, TRAPS);

    80   // Garbage collection

    81   int  oop_adjust_pointers(oop obj);

    82   void oop_follow_contents(oop obj);

    84   // Parallel Scavenge and Parallel Old

    85   PARALLEL_GC_DECLS

    87   int oop_oop_iterate(oop obj, OopClosure* blk) {

    88     return oop_oop_iterate_v(obj, blk);

    89   }

    90   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {

    91     return oop_oop_iterate_v_m(obj, blk, mr);

    92   }

    94 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)           \

    95   int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);                       \

    96   int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);

    98   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)

    99   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)

   101 #ifndef SERIALGC

   102 #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \

   103   int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);

   105   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)

   106   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)

   107 #endif // !SERIALGC

   108 };

   110 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP

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