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.Arrays;
  29 import java.util.Collections;
  30 import java.util.regex.Pattern;
  31 import java.util.regex.Matcher;
  32 
  33 import 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  */
  43 public 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 }