1 /*
2  * Copyright (c) 2014, 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 
24 package sun.hotspot.cpuinfo;
25 
26 import java.util.List;
27 import java.util.Arrays;
28 import java.util.Collections;
29 import java.util.regex.Pattern;
30 import java.util.regex.Matcher;
31 
32 import sun.hotspot.WhiteBox;
33 
34 /**
35  * Information about CPU on test box.
36  *
37  * CPUInfo uses WhiteBox to gather information,
38  * so WhiteBox class should be added to bootclasspath
39  * and option -XX:+WhiteBoxAPI should be explicitly
40  * specified on command line.
41  */
42 public class CPUInfo {
43 
44     private static final List<String> features;
45     private static final String additionalCPUInfo;
46 
47     static {
48         WhiteBox wb = WhiteBox.getWhiteBox();
49 
50         Pattern additionalCPUInfoRE =
51             Pattern.compile("([^(]*\\([^)]*\\)[^,]*),\\s*");
52 
53         String cpuFeaturesString = wb.getCPUFeatures();
54         Matcher matcher = additionalCPUInfoRE.matcher(cpuFeaturesString);
55         if (matcher.find()) {
56             additionalCPUInfo = matcher.group(1);
57         } else {
58             additionalCPUInfo = "";
59         }
60         String splittedFeatures[] = matcher.replaceAll("").split("(, )| ");
61 
62         features = Collections.unmodifiableList(Arrays.
63                                                 asList(splittedFeatures));
64     }
65 
66     /**
67      * Get additional information about CPU.
68      * For example, on X86 in will be family/model/stepping
69      * and number of cores.
70      *
71      * @return additional CPU info
72      */
getAdditionalCPUInfo()73     public static String getAdditionalCPUInfo() {
74         return additionalCPUInfo;
75     }
76 
77     /**
78      * Get all known features supported by CPU.
79      *
80      * @return unmodifiable list with names of all known features
81      *         supported by CPU.
82      */
getFeatures()83     public static List<String> getFeatures() {
84         return features;
85     }
86 
87     /**
88      * Check if some feature is supported by CPU.
89      *
90      * @param feature Name of feature to be tested.
91      * @return <b>true</b> if tested feature is supported by CPU.
92      */
hasFeature(String feature)93     public static boolean hasFeature(String feature) {
94         return features.contains(feature.toLowerCase());
95     }
96 }
97