1 /*

     2  * Copyright (c) 2011, 2017, 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 #ifndef SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP

    26 #define SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP

    27 

    28 #include "gc/shared/specialized_oop_closures.hpp"

    29 #include "oops/instanceKlass.hpp"

    30 #include "utilities/macros.hpp"

    31 

    32 class ClassFileParser;

    33 

    34 // An InstanceClassLoaderKlass is a specialization of the InstanceKlass. It does

    35 // not add any field.  It is added to walk the dependencies for the class loader

    36 // key that this class loader points to.  This is how the loader_data graph is

    37 // walked and dependant class loaders are kept alive.  I thought we walked

    38 // the list later?

    39 

    40 class InstanceClassLoaderKlass: public InstanceKlass {

    41   friend class VMStructs;

    42   friend class InstanceKlass;

    43  private:

    44   InstanceClassLoaderKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_class_loader) {}

    45 

    46 public:

    47   InstanceClassLoaderKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }

    48 

    49   // GC specific object visitors

    50   //

    51 #if INCLUDE_ALL_GCS

    52   // Parallel Scavenge

    53   void oop_ps_push_contents(  oop obj, PSPromotionManager* pm);

    54   // Parallel Compact

    55   void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);

    56   void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);

    57 #endif

    58 

    59   // Oop fields (and metadata) iterators

    60   //  [nv = true]  Use non-virtual calls to do_oop_nv.

    61   //  [nv = false] Use virtual calls to do_oop.

    62   //

    63   // The InstanceClassLoaderKlass iterators also visit the CLD pointer (or mirror of anonymous klasses.)

    64 

    65  private:

    66   // Forward iteration

    67   // Iterate over the oop fields and metadata.

    68   template <bool nv, class OopClosureType>

    69   inline void oop_oop_iterate(oop obj, OopClosureType* closure);

    70 

    71 #if INCLUDE_ALL_GCS

    72   // Reverse iteration

    73   // Iterate over the oop fields and metadata.

    74   template <bool nv, class OopClosureType>

    75   inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);

    76 #endif

    77 

    78   // Bounded range iteration

    79   // Iterate over the oop fields and metadata.

    80   template <bool nv, class OopClosureType>

    81   inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);

    82 

    83  public:

    84 

    85   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)

    86   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)

    87 

    88 #if INCLUDE_ALL_GCS

    89   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)

    90   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)

    91 #endif // INCLUDE_ALL_GCS

    92 

    93 };

    94 

    95 #endif // SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP