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
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 package jdk.vm.ci.hotspot;
24 
25 import jdk.vm.ci.meta.JavaConstant;
26 
27 final class DirectHotSpotObjectConstantImpl extends HotSpotObjectConstantImpl {
28 
forObject(Object object, boolean compressed)29     static JavaConstant forObject(Object object, boolean compressed) {
30         if (object == null) {
31             return compressed ? HotSpotCompressedNullConstant.COMPRESSED_NULL : JavaConstant.NULL_POINTER;
32         } else {
33             return new DirectHotSpotObjectConstantImpl(object, compressed);
34         }
35     }
36 
forNonNullObject(Object object, boolean compressed)37     static HotSpotObjectConstantImpl forNonNullObject(Object object, boolean compressed) {
38         if (object == null) {
39             throw new NullPointerException();
40         }
41         return new DirectHotSpotObjectConstantImpl(object, compressed);
42     }
43 
DirectHotSpotObjectConstantImpl(Object object, boolean compressed)44     private DirectHotSpotObjectConstantImpl(Object object, boolean compressed) {
45         super(compressed);
46         assert object != null;
47         this.object = object;
48     }
49 
50     final Object object;
51 
52     @Override
compress()53     public JavaConstant compress() {
54         assert !compressed;
55         return new DirectHotSpotObjectConstantImpl(object, true);
56     }
57 
58     @Override
uncompress()59     public JavaConstant uncompress() {
60         assert compressed;
61         return new DirectHotSpotObjectConstantImpl(object, false);
62     }
63 
64     @Override
getIdentityHashCode()65     public int getIdentityHashCode() {
66         return System.identityHashCode(object);
67     }
68 }
69