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 GC_SHARED_FULLGCFORWARDING_INLINE_HPP
26 #define GC_SHARED_FULLGCFORWARDING_INLINE_HPP
27 
28 #include "gc/shared/fullGCForwarding.hpp"
29 
30 #include "oops/oop.inline.hpp"
31 #include "utilities/globalDefinitions.hpp"
32 
33 void FullGCForwarding::forward_to(oop from, oop to) {
34 #ifdef _LP64
35   uintptr_t encoded = pointer_delta(cast_from_oop<HeapWord*>(to), _heap_base) << Shift;
36   assert(encoded <= static_cast<uintptr_t>(right_n_bits(_num_low_bits)), "encoded forwardee must fit");
37   uintptr_t mark = from->mark().value();
38   mark &= ~right_n_bits(_num_low_bits);
39   mark |= (encoded | markWord::marked_value);
40   from->set_mark(markWord(mark));
41 #else
42   from->forward_to(to);
43 #endif
44 }
45 
46 oop FullGCForwarding::forwardee(oop from) {
47 #ifdef _LP64
48   uintptr_t mark = from->mark().value();
49   HeapWord* decoded = _heap_base + ((mark & right_n_bits(_num_low_bits)) >> Shift);
50   return cast_to_oop(decoded);
51 #else
52   return from->forwardee();
53 #endif
54 }
55 
56 bool FullGCForwarding::is_forwarded(oop obj) {
57   return obj->mark().is_forwarded();
58 }
59 
60 #endif // GC_SHARED_FULLGCFORWARDING_INLINE_HPP