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 }