1 /*
 2  * Copyright (c) 2023, 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.
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19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24 
25 #ifndef SHARE_CDS_REGENERATEDCLASSES_HPP
26 #define SHARE_CDS_REGENERATEDCLASSES_HPP
27 
28 #include "memory/allStatic.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 
31 class InstanceKlass;
32 
33 // CDS regenerates some of the classes that are loaded normally during the dumping
34 // process. For example, LambdaFormInvokers creates new versions of the four
35 // java.lang.invoke.xxx$Holder classes that have additional methods.
36 //
37 // RegeneratedClasses records the relocation between the "original" and
38 // "regenerated" versions of these classes. When writing the CDS archive, all
39 // references to the "original" versions are redirected to the "regenerated"
40 // versions.
41 class RegeneratedClasses : public AllStatic {
42  public:
43   static void add_class(InstanceKlass* orig_klass, InstanceKlass* regen_klass);
44   static void cleanup();
45   static bool has_been_regenerated(address orig_obj);
46   static address get_regenerated_object(address orig_obj);
47   static bool is_a_regenerated_object(address obj);
48   static void record_regenerated_objects();
49 };
50 
51 #endif // SHARE_CDS_REGENERATEDCLASSES_HPP