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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2019, 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.impl;
import sun.misc.Unsafe;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.ServiceLoader;
/**
* JDK 8 implementation of {@code TruffleJDKServices}.
*/
final class TruffleJDKServices {
@SuppressWarnings("unused")
static void exportTo(ClassLoader loader, String moduleName) {
// No need to do anything on JDK 8
}
@SuppressWarnings("unused")
static void exportTo(Class client) {
// No need to do anything on JDK 8
}
@SuppressWarnings("unused")
static void addReads(Class client) {
// No need to do anything on JDK 8
}
@SuppressWarnings("unused")
static void addUses(Class service) {
// No need to do anything on JDK 8
}
/**
* Gets the ordered list of loaders for {@link TruffleRuntimeAccess} providers.
*/
static List> getTruffleRuntimeLoaders(Class serviceClass) {
// public static List> getTruffleRuntimeLoaders() {
Iterable jvmciProviders = getJVMCIProviders(serviceClass);
if (Boolean.getBoolean("truffle.TrustAllTruffleRuntimeProviders")) {
ServiceLoader standardProviders = ServiceLoader.load(serviceClass);
return Arrays.asList(jvmciProviders, standardProviders);
} else {
return Collections.singletonList(jvmciProviders);
}
}
/**
* Gets the providers of {@code Service} available on the JVMCI class path.
*/
private static Iterable getJVMCIProviders(Class serviceClass) {
ClassLoader cl = TruffleJDKServices.class.getClassLoader();
ClassLoader scl = ClassLoader.getSystemClassLoader();
while (cl != null) {
if (cl == scl) {
/*
* If Truffle can see the app class loader, then it is not on the JVMCI class path.
* This means providers of TruffleRuntimeAccess on the JVMCI class path must be
* ignored as they will bind to the copy of Truffle resolved on the JVMCI class
* path. Failing to ignore will result in ServiceConfigurationErrors (e.g.,
* https://github.com/oracle/graal/issues/385#issuecomment-385313521).
*/
return null;
}
cl = cl.getParent();
}
Class jvmciServicesClass;
try {
// Access JVMCI via reflection to avoid a hard
// dependency on JVMCI from Truffle.
jvmciServicesClass = Class.forName("jdk.vm.ci.services.Services");
} catch (ClassNotFoundException e) {
// JVMCI is unavailable so the default TruffleRuntime will be used
return null;
}
return reflectiveServiceLoaderLoad(jvmciServicesClass, serviceClass);
}
@SuppressWarnings("unchecked")
private static Iterable reflectiveServiceLoaderLoad(Class servicesClass, Class serviceClass) {
try {
Method m = servicesClass.getDeclaredMethod("load", Class.class);
return (Iterable) m.invoke(null, serviceClass);
} catch (Throwable e) {
throw new InternalError(e);
}
}
static Object getUnnamedModule(@SuppressWarnings("unused") ClassLoader classLoader) {
return null;
}
static boolean verifyModuleVisibility(Object currentModule, @SuppressWarnings("unused") Class memberClass) {
assert currentModule == null;
return true;
}
static boolean isNonTruffleClass(Class clazz) {
// classes on the boot loader should not be cleared
return clazz.getClassLoader() != null;
}
static void fullFence() {
UNSAFE.fullFence();
}
static void acquireFence() {
UNSAFE.loadFence();
}
static void releaseFence() {
UNSAFE.storeFence();
}
static void loadLoadFence() {
UNSAFE.loadFence();
}
static void storeStoreFence() {
UNSAFE.storeFence();
}
static final Unsafe UNSAFE = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Unsafe run() {
try {
Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe");
theUnsafeInstance.setAccessible(true);
return (Unsafe) theUnsafeInstance.get(Unsafe.class);
} catch (Exception e) {
throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e);
}
}
});
}