1 /* 2 * Copyright (c) 2015, 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.internal.jvmci.runtime; 24 25 import java.util.*; 26 27 public class JVMCI { 28 29 private static final JVMCIRuntime runtime; 30 31 private static native JVMCIRuntime initializeRuntime(); 32 33 public static void initialize() { 34 // force static initializer 35 } 36 37 /** 38 * Gets the singleton {@link JVMCIRuntime} instance available to the application. 39 * 40 * @throws UnsupportedOperationException if JVMCI is not supported 41 */ 42 public static JVMCIRuntime getRuntime() { 43 if (runtime == null) { 44 String javaHome = System.getProperty("java.home"); 45 String vmName = System.getProperty("java.vm.name"); 46 Formatter errorMessage = new Formatter(); 47 errorMessage.format("The VM does not support the JVMCI API.%n"); 48 errorMessage.format("Currently used Java home directory is %s.%n", javaHome); 49 errorMessage.format("Currently used VM configuration is: %s", vmName); 50 throw new UnsupportedOperationException(errorMessage.toString()); 51 } 52 return runtime; 53 } 54 55 static { 56 JVMCIRuntime rt = null; 57 try { 58 rt = initializeRuntime(); 59 } catch (UnsatisfiedLinkError e) { 60 } 61 runtime = rt; 62 } 63 }