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      */
  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 }