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
21  * questions.
22  *
23  */
24 
25 #ifndef SHARE_OOPS_MARKWORD_INLINE_HPP
26 #define SHARE_OOPS_MARKWORD_INLINE_HPP
27 
28 #include "oops/markWord.hpp"
29 
30 #include "oops/compressedOops.inline.hpp"
31 
32 narrowKlass markWord::narrow_klass() const {
33 #ifdef _LP64
34   assert(UseCompactObjectHeaders, "only used with compact object headers");
35   return narrowKlass(value() >> klass_shift);
36 #else
37   ShouldNotReachHere();
38   return 0;
39 #endif
40 }
41 
42 markWord markWord::set_narrow_klass(narrowKlass narrow_klass) const {
43 #ifdef _LP64
44   assert(UseCompactObjectHeaders, "only used with compact object headers");
45   return markWord((value() & ~klass_mask_in_place) | ((uintptr_t) narrow_klass << klass_shift));
46 #else
47   ShouldNotReachHere();
48   return markWord(0);
49 #endif
50 }
51 
52 Klass* markWord::klass() const {
53 #ifdef _LP64
54   assert(UseCompactObjectHeaders, "only used with compact object headers");
55   return CompressedKlassPointers::decode_not_null(narrow_klass());
56 #else
57   ShouldNotReachHere();
58   return nullptr;
59 #endif
60 }
61 
62 Klass* markWord::klass_or_null() const {
63 #ifdef _LP64
64   assert(UseCompactObjectHeaders, "only used with compact object headers");
65   return CompressedKlassPointers::decode(narrow_klass());
66 #else
67   ShouldNotReachHere();
68   return nullptr;
69 #endif
70 }
71 
72 Klass* markWord::klass_without_asserts() const {
73 #ifdef _LP64
74   assert(UseCompactObjectHeaders, "only used with compact object headers");
75   return CompressedKlassPointers::decode_without_asserts(narrow_klass());
76 #else
77   ShouldNotReachHere();
78   return nullptr;
79 #endif
80 }
81 
82 #endif // SHARE_OOPS_MARKWORD_INLINE_HPP