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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, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.oracle.truffle.api;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.List;
import java.util.ServiceConfigurationError;
import com.oracle.truffle.api.impl.Accessor;
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 final class Truffle {
private 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 TruffleRuntimeAccess selectTruffleRuntimeAccess(List> lookups) {
TruffleRuntimeAccess selectedAccess = null;
for (Iterable lookup : lookups) {
if (lookup != null) {
Iterator it = lookup.iterator();
while (it.hasNext()) {
TruffleRuntimeAccess access;
try {
access = it.next();
} catch (ServiceConfigurationError err) {
continue;
}
if (selectedAccess == null) {
selectedAccess = access;
} else {
if (selectedAccess != access && selectedAccess.getClass() != access.getClass()) {
if (selectedAccess.getPriority() == access.getPriority()) {
throw new InternalError(String.format("Providers for %s with same priority %d: %s (loader: %s) vs. %s (loader: %s)",
TruffleRuntimeAccess.class.getName(), access.getPriority(),
selectedAccess, selectedAccess.getClass().getClassLoader(),
access, access.getClass().getClassLoader()));
}
if (selectedAccess.getPriority() < access.getPriority()) {
selectedAccess = access;
}
}
}
}
}
}
return selectedAccess;
}
private static TruffleRuntime initRuntime() {
return AccessController.doPrivileged(new PrivilegedAction() {
public TruffleRuntime run() {
String runtimeClassName = System.getProperty("truffle.TruffleRuntime");
if (runtimeClassName != null && runtimeClassName.length() > 0) {
try {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class runtimeClass = Class.forName(runtimeClassName, false, cl);
return (TruffleRuntime) runtimeClass.getDeclaredConstructor().newInstance();
} catch (Throwable e) {
// Fail fast for other errors
throw new InternalError(e);
}
}
List> loaders = TruffleAccessor.jdkServicesAccessor().getTruffleRuntimeLoaders(TruffleRuntimeAccess.class);
TruffleRuntimeAccess access = selectTruffleRuntimeAccess(loaders);
if (access != null) {
TruffleAccessor.jdkServicesAccessor().exportTo(access.getClass());
return access.getRuntime();
}
return new DefaultTruffleRuntime();
}
});
}
}
/*
* Truffle accessor for use during truffle initialization to avoid cyclic dependencies.
*/
final class TruffleAccessor extends Accessor {
static final TruffleAccessor ACCESSOR = new TruffleAccessor();
private TruffleAccessor() {
}
static JDKSupport jdkServicesAccessor() {
return ACCESSOR.jdkSupport();
}
}