CPUInfo.java revision 1265:c82ea5393dda 
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
25package sun.hotspot.cpuinfo;
26
27import java.util.List;
28import java.util.Arrays;
29import java.util.Collections;
30import java.util.regex.Pattern;
31import java.util.regex.Matcher;
32
33import sun.hotspot.WhiteBox;
34
35/**
36 * Information about CPU on test box.
37 *
38 * CPUInfo uses WhiteBox to gather information,
39 * so WhiteBox class should be added to bootclasspath
40 * and option -XX:+WhiteBoxAPI should expclicetly
41 * specified on command line.
42 */
43public class CPUInfo {
44
45    private static final List<String> features;
46    private static final String additionalCPUInfo;
47
48    static {
49        WhiteBox wb = WhiteBox.getWhiteBox();
50
51        Pattern additionalCPUInfoRE =
52            Pattern.compile("([^(]*\\([^)]*\\)[^,]*),\\s*");
53
54        String cpuFeaturesString = wb.getCPUFeatures();
55        Matcher matcher = additionalCPUInfoRE.matcher(cpuFeaturesString);
56        if (matcher.find()) {
57            additionalCPUInfo = matcher.group(1);
58        } else {
59            additionalCPUInfo = "";
60        }
61        String splittedFeatures[] = matcher.replaceAll("").split("(, )| ");
62
63        features = Collections.unmodifiableList(Arrays.
64                                                asList(splittedFeatures));
65    }
66
67    /**
68     * Get additional information about CPU.
69     * For example, on X86 in will be family/model/stepping
70     * and number of cores.
71     *
72     * @return additional CPU info
73     */
74    public static String getAdditionalCPUInfo() {
75        return additionalCPUInfo;
76    }
77
78    /**
79     * Get all known features supported by CPU.
80     *
81     * @return unmodifiable list with names of all known features
82     *         supported by CPU.
83     */
84    public static List<String> getFeatures() {
85        return features;
86    }
87
88    /**
89     * Check if some feature is supported by CPU.
90     *
91     * @param feature Name of feature to be tested.
92     * @return <b>true</b> if tested feature is supported by CPU.
93     */
94    public static boolean hasFeature(String feature) {
95        return features.contains(feature.toLowerCase());
96    }
97}
98