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 }