1 /*
 2  * Copyright Amazon.com Inc. 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  */
24 
25 #ifndef SHARE_GC_SHARED_GCFORWARDING_HPP
26 #define SHARE_GC_SHARED_GCFORWARDING_HPP
27 
28 #include "memory/allStatic.hpp"
29 #include "memory/memRegion.hpp"
30 #include "oops/oopsHierarchy.hpp"
31 
32 class SlidingForwarding;
33 
34 class GCForwarding : public AllStatic {
35 private:
36   static SlidingForwarding* _sliding_forwarding;
37 
38 public:
39   static void initialize(MemRegion heap, size_t region_size_words_shift);
40   static void begin();
41   static void end();
42 
43   static inline bool is_forwarded(oop obj);
44   static inline bool is_not_forwarded(oop obj);
45   static inline oop forwardee(oop obj);
46   static inline void forward_to(oop obj, oop fwd);
47 };
48 
49 #endif // SHARE_GC_SHARED_GCFORWARDING_HPP