1 /*
 2  * Copyright (c) 1997, 2020, 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
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24 
25 #ifndef SHARE_OOPS_INSTANCEOOP_HPP
26 #define SHARE_OOPS_INSTANCEOOP_HPP
27 
28 #include "oops/oop.hpp"
29 
30 // An instanceOop is an instance of a Java Class
31 // Evaluating "new HashTable()" will create an instanceOop.
32 
33 class instanceOopDesc : public oopDesc {
34  public:
35   // aligned header size.
36   static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; }
37 
38   // If compressed, the offset of the fields of the instance may not be aligned.
39   static int base_offset_in_bytes() {
40     return (UseCompressedClassPointers) ?
41             klass_gap_offset_in_bytes() :
42             sizeof(instanceOopDesc);
43 
44   }
45 };
46 
47 #endif // SHARE_OOPS_INSTANCEOOP_HPP