| /* |
| * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.vm.ci.services; |
| |
| import java.lang.reflect.Method; |
| import java.util.Map; |
| |
| /** |
| * Provides utilities needed by JVMCI clients. |
| */ |
| public final class Services { |
| |
| // This class must be compilable and executable on JDK 8 since it's used in annotation |
| // processors while building JDK 9 so use of API added in JDK 9 is made via reflection. |
| |
| private Services() { |
| } |
| |
| @SuppressWarnings("unchecked") |
| private static Map<String, String> initSavedProperties() throws InternalError { |
| try { |
| Class<?> vmClass = Class.forName("jdk.internal.misc.VM"); |
| Method m = vmClass.getMethod("getSavedProperties"); |
| return (Map<String, String>) m.invoke(null); |
| } catch (Exception e) { |
| throw new InternalError(e); |
| } |
| } |
| |
| static final Map<String, String> SAVED_PROPERTIES = initSavedProperties(); |
| static final boolean JVMCI_ENABLED = Boolean.parseBoolean(SAVED_PROPERTIES.get("jdk.internal.vm.ci.enabled")); |
| |
| /** |
| * Checks that JVMCI is enabled in the VM and throws an error if it isn't. |
| */ |
| static void checkJVMCIEnabled() { |
| if (!JVMCI_ENABLED) { |
| throw new Error("The EnableJVMCI VM option must be true (i.e., -XX:+EnableJVMCI) to use JVMCI"); |
| } |
| } |
| |
| /** |
| * Gets an unmodifiable copy of the system properties saved when {@link System} is initialized. |
| */ |
| public static Map<String, String> getSavedProperties() { |
| checkJVMCIEnabled(); |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(new JVMCIPermission()); |
| } |
| return SAVED_PROPERTIES; |
| } |
| |
| /** |
| * Causes the JVMCI subsystem to be initialized if it isn't already initialized. |
| */ |
| public static void initializeJVMCI() { |
| checkJVMCIEnabled(); |
| try { |
| Class.forName("jdk.vm.ci.runtime.JVMCI"); |
| } catch (ClassNotFoundException e) { |
| throw new InternalError(e); |
| } |
| } |
| } |