1 /* 2 * Copyright (c) 2014, 2016, 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 package jdk.vm.ci.services; 24 25 import java.lang.reflect.Method; 26 import java.util.Map; 27 28 /** 29 * Provides utilities needed by JVMCI clients. 30 * 31 * This class must be compilable on JDK 8 and so use of API added in JDK 9 is made via reflection. 32 */ 33 public final class Services { 34 35 private Services() { 36 } 37 38 /** 39 * Gets an unmodifiable copy of the system properties saved when {@link System} is initialized. 40 */ 41 @SuppressWarnings("unchecked") 42 public static Map<String, String> getSavedProperties() { 43 SecurityManager sm = System.getSecurityManager(); 44 if (sm != null) { 45 sm.checkPermission(new JVMCIPermission()); 46 } 47 try { 48 Class<?> vmClass = Class.forName("jdk.internal.misc.VM"); 49 Method m = vmClass.getMethod("getSavedProperties"); 50 return (Map<String, String>) m.invoke(null); 51 } catch (Exception e) { 52 throw new InternalError(e); 53 } 54 } 55 56 /** 57 * Causes the JVMCI subsystem to be initialized if it isn't already initialized. 58 */ 59 public static void initializeJVMCI() { 60 try { 61 Class.forName("jdk.vm.ci.runtime.JVMCI"); 62 } catch (ClassNotFoundException e) { 63 throw new InternalError(e); 64 } 65 } 66 }