1 /*
 2  * Copyright (c) 2011, 2019, 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_OOPS_INSTANCECLASSLOADERKLASS_HPP
26 #define SHARE_OOPS_INSTANCECLASSLOADERKLASS_HPP
27 
28 #include "oops/instanceKlass.hpp"
29 #include "utilities/macros.hpp"
30 
31 class ClassFileParser;
32 
33 // An InstanceClassLoaderKlass is a specialization of the InstanceKlass. It does
34 // not add any field.  It is added to walk the dependencies for the class loader
35 // key that this class loader points to.  This is how the loader_data graph is
36 // walked and dependent class loaders are kept alive.  I thought we walked
37 // the list later?
38 
39 class InstanceClassLoaderKlass: public InstanceKlass {
40   friend class VMStructs;
41   friend class InstanceKlass;
42 public:
43   static const KlassID ID = InstanceClassLoaderKlassID;
44 
45 private:
46   InstanceClassLoaderKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_kind_class_loader, ID) {}
47 
48 public:
49   InstanceClassLoaderKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
50 
51   // Oop fields (and metadata) iterators
52   //
53 
54   // Forward iteration
55   // Iterate over the oop fields and metadata.
56   template <typename T, class OopClosureType>
57   inline void oop_oop_iterate(oop obj, OopClosureType* closure);
58 
59   // Reverse iteration
60   // Iterate over the oop fields and metadata.
61   template <typename T, class OopClosureType>
62   inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
63 
64   // Bounded range iteration
65   // Iterate over the oop fields and metadata.
66   template <typename T, class OopClosureType>
67   inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
68 };
69 
70 #endif // SHARE_OOPS_INSTANCECLASSLOADERKLASS_HPP