1 /*
2  * Copyright (c) 2018, 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
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8  *
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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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24 
25 package sun.jvm.hotspot.gc.z;
26 
27 import sun.jvm.hotspot.debugger.Address;
28 import sun.jvm.hotspot.runtime.VMObjectFactory;
29 
30 class ZPageTableEntry {
31     Address entry;
32 
ZPageTableEntry(Address address)33     ZPageTableEntry(Address address) {
34         entry = address;
35     }
36 
page()37     ZPage page() {
38         return (ZPage)VMObjectFactory.newObject(ZPage.class, zPageBits());
39     }
40 
zPageBits()41     private Address zPageBits() {
42         return entry.andWithMask(~1L);
43     }
44 
relocating()45     boolean relocating() {
46         return (entry.asLongValue() & 1) == 1;
47     }
48 
isEmpty()49     boolean isEmpty() {
50         return entry == null || zPageBits() == null;
51     }
52 }
53