1 /*
 2  * Copyright (c) 2022, 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.  Oracle designates this
 8  * particular file as subject to the "Classpath" exception as provided
 9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
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24  */
25 package jdk.internal.misc;
26 
27 /**
28  * Defines static methods to test if Valhalla features are enabled at run-time.
29  */
30 public class ValhallaFeatures {
31     private static final boolean ENABLED = isValhallaEnabled();
32 
33     private ValhallaFeatures() {
34     }
35 
36     /**
37      * {@return true if Valhalla features are enabled, otherwise false}
38      */
39     public static boolean isEnabled() {
40         return ENABLED;
41     }
42 
43     /**
44      * Ensures that EnableValhalla features are enabled.
45      * @throws UnsupportedOperationException if EnableValhalla features are not enabled
46      */
47     public static void ensureValhallaEnabled() {
48         if (!ENABLED) {
49             throw new UnsupportedOperationException(
50                     "ValhallaFeatures Features not enabled, need to run with -XX:+EnableValhalla");
51         }
52     }
53 
54     private static native boolean isValhallaEnabled();
55 }