CPUInfo.java revision 2289:1c9b94ce045e 
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
24package sun.hotspot.cpuinfo;
25
26import java.util.List;
27import java.util.Arrays;
28import java.util.Collections;
29import java.util.regex.Pattern;
30import java.util.regex.Matcher;
31
32import 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 expclicetly
40 * specified on command line.
41 */
42public 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     */
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     */
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     */
93    public static boolean hasFeature(String feature) {
94        return features.contains(feature.toLowerCase());
95    }
96}
97