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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2012, 2012, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 com.oracle.truffle.api;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.ServiceLoader;
import com.oracle.truffle.api.impl.DefaultTruffleRuntime;
/**
* Class for obtaining the Truffle runtime singleton object of this virtual machine.
*
* @since 0.8 or earlier
*/
public class Truffle {
/**
* @deprecated Accidentally public - don't use.
* @since 0.8 or earlier
*/
@Deprecated
public Truffle() {
}
private static final TruffleRuntime RUNTIME = initRuntime();
/**
* Gets the singleton {@link TruffleRuntime} object.
*
* @since 0.8 or earlier
*/
public static TruffleRuntime getRuntime() {
return RUNTIME;
}
private static TruffleRuntime initRuntime() {
return AccessController.doPrivileged(new PrivilegedAction() {
public TruffleRuntime run() {
String runtimeClassName = System.getProperty("truffle.TruffleRuntime");
if (runtimeClassName != null) {
try {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class> runtimeClass = Class.forName(runtimeClassName, false, cl);
return (TruffleRuntime) runtimeClass.newInstance();
} catch (Throwable e) {
// Fail fast for other errors
throw (InternalError) new InternalError().initCause(e);
}
}
TruffleRuntimeAccess access = null;
Class> servicesClass = null;
boolean jdk8OrEarlier = System.getProperty("java.specification.version").compareTo("1.9") < 0;
if (!jdk8OrEarlier) {
// As of JDK9, the JVMCI Services class should only be used for service types
// defined by JVMCI. Other services types should use ServiceLoader directly.
Iterator providers = ServiceLoader.load(TruffleRuntimeAccess.class).iterator();
if (providers.hasNext()) {
access = providers.next();
if (providers.hasNext()) {
throw new InternalError(String.format("Multiple %s providers found", TruffleRuntimeAccess.class.getName()));
}
}
} else {
try {
servicesClass = Class.forName("jdk.vm.ci.services.Services");
} catch (ClassNotFoundException e) {
}
if (servicesClass == null) {
try {
servicesClass = Class.forName("jdk.vm.ci.service.Services");
} catch (ClassNotFoundException e) {
}
}
if (servicesClass == null) {
try {
servicesClass = Class.forName("jdk.internal.jvmci.service.Services");
} catch (ClassNotFoundException e) {
}
}
if (servicesClass == null) {
try {
servicesClass = Class.forName("com.oracle.jvmci.service.Services");
} catch (ClassNotFoundException e) {
// JVMCI is unavailable
}
}
if (servicesClass != null) {
try {
Method m = servicesClass.getDeclaredMethod("loadSingle", Class.class, boolean.class);
access = (TruffleRuntimeAccess) m.invoke(null, TruffleRuntimeAccess.class, false);
} catch (Throwable e) {
// Fail fast for other errors
throw (InternalError) new InternalError().initCause(e);
}
}
}
// TODO: try standard ServiceLoader?
if (access != null) {
return access.getRuntime();
}
return new DefaultTruffleRuntime();
}
});
}
}
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