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/*
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* Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.vm.ci.services;
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import java.lang.reflect.Method;
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44836
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import java.util.Map;
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43972
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/**
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44836
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* Provides utilities needed by JVMCI clients.
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43972
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*/
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public final class Services {
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// This class must be compilable and executable on JDK 8 since it's used in annotation
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// processors while building JDK 9 so use of API added in JDK 9 is made via reflection.
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private Services() {
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}
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@SuppressWarnings("unchecked")
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private static Map<String, String> initSavedProperties() throws InternalError {
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try {
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Class<?> vmClass = Class.forName("jdk.internal.misc.VM");
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Method m = vmClass.getMethod("getSavedProperties");
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return (Map<String, String>) m.invoke(null);
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} catch (Exception e) {
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throw new InternalError(e);
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}
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}
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static final Map<String, String> SAVED_PROPERTIES = initSavedProperties();
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static final boolean JVMCI_ENABLED = Boolean.parseBoolean(SAVED_PROPERTIES.get("jdk.internal.vm.ci.enabled"));
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/**
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* Checks that JVMCI is enabled in the VM and throws an error if it isn't.
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*/
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static void checkJVMCIEnabled() {
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if (!JVMCI_ENABLED) {
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throw new Error("The EnableJVMCI VM option must be true (i.e., -XX:+EnableJVMCI) to use JVMCI");
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}
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}
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/**
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* Gets an unmodifiable copy of the system properties saved when {@link System} is initialized.
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*/
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public static Map<String, String> getSavedProperties() {
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checkJVMCIEnabled();
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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sm.checkPermission(new JVMCIPermission());
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}
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return SAVED_PROPERTIES;
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}
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/**
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* Causes the JVMCI subsystem to be initialized if it isn't already initialized.
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*/
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public static void initializeJVMCI() {
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checkJVMCIEnabled();
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try {
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Class.forName("jdk.vm.ci.runtime.JVMCI");
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} catch (ClassNotFoundException e) {
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throw new InternalError(e);
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}
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}
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}
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