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 

    25 package sun.hotspot.cpuinfo;

    26 

    27 import java.util.List;

    28 import java.util.ArrayList;

    29 import java.util.Arrays;

    30 import java.util.Collections;

    31 import java.util.regex.Pattern;

    32 import java.util.regex.Matcher;

    33 

    34 import sun.hotspot.WhiteBox;

    35 

    36 /**

    37  * Information about CPU on test box.

    38  *

    39  * CPUInfo uses WhiteBox to gather information,

    40  * so WhiteBox class should be added to bootclasspath

    41  * and option -XX:+WhiteBoxAPI should expclicetly

    42  * specified on command line.

    43  */

    44 public class CPUInfo {

    45 

    46     private static final List<String> features;

    47     private static final String additionalCPUInfo;

    48 

    49     static {

    50         WhiteBox wb = WhiteBox.getWhiteBox();

    51 

    52         Pattern additionalCPUInfoRE =

    53             Pattern.compile("([^(]*\\([^)]*\\)[^,]*),\\s*");

    54 

    55         String cpuFeaturesString = wb.getCPUFeatures();

    56         Matcher matcher = additionalCPUInfoRE.matcher(cpuFeaturesString);

    57         if (matcher.find()) {

    58             additionalCPUInfo = matcher.group(1);

    59         } else {

    60             additionalCPUInfo = "";

    61         }

    62         String splittedFeatures[] = matcher.replaceAll("").split("(, )| ");

    63 

    64         features = Collections.unmodifiableList(Arrays.

    65                                                 asList(splittedFeatures));

    66     }

    67 

    68     /**

    69      * Get additional information about CPU.

    70      * For example, on X86 in will be family/model/stepping

    71      * and number of cores.

    72      *

    73      * @return additional CPU info

    74      */

    75     public static String getAdditionalCPUInfo() {

    76         return additionalCPUInfo;

    77     }

    78 

    79     /**

    80      * Get all known features supported by CPU.

    81      *

    82      * @return unmodifiable list with names of all known features

    83      *         supported by CPU.

    84      */

    85     public static List<String> getFeatures() {

    86         return features;

    87     }

    88 

    89     /**

    90      * Check if some feature is supported by CPU.

    91      *

    92      * @param feature Name of feature to be tested.

    93      * @return <b>true</b> if tested feature is supported by CPU.

    94      */

    95     public static boolean hasFeature(String feature) {

    96         return features.contains(feature.toLowerCase());

    97     }

    98 }