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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2020, 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.polyglot;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.AllPermission;
import java.security.CodeSigner;
import java.security.CodeSource;
import java.security.Permissions;
import java.security.ProtectionDomain;
import java.security.SecureClassLoader;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Objects;
import java.util.function.Supplier;
import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Value;
/**
* This class encapsulates the bytecode of the adapter class and can be used to load it into the JVM
* as an actual Class. It can be invoked repeatedly to create multiple adapter classes from the same
* bytecode; adapter classes that have class-level overrides must be re-created for every set of
* such overrides. Instances of this class are normally created by
* {@link HostAdapterBytecodeGenerator}.
*/
final class HostAdapterClassLoader {
static final ProtectionDomain GENERATED_PROTECTION_DOMAIN = createGeneratedProtectionDomain();
static final Collection VISIBLE_INTERNAL_CLASS_NAMES = Collections.unmodifiableCollection(
new HashSet<>(Arrays.asList(Value.class.getName())));
static final String SERVICE_CLASS_NAME = "com.oracle.truffle.polyglot.hostadapters.HostAdapterServices";
interface LazyClassBytes {
byte[] SERVICE_CLASS_BYTES = loadClassBytes(SERVICE_CLASS_NAME);
}
private final String className;
private final byte[] classBytes;
HostAdapterClassLoader(String className, byte[] classBytes) {
this.className = className.replace('/', '.');
this.classBytes = classBytes;
}
/**
* Loads the generated adapter class into the JVM.
*
* @param parentLoader the parent class loader for the generated class loader
* @return the generated adapter class
*/
Class generateClass(ClassLoader parentLoader, Object classOverrides) {
try {
return Class.forName(className, true, createClassLoader(parentLoader, classOverrides));
} catch (final ClassNotFoundException e) {
throw new IllegalStateException(e);
}
}
private ClassLoader createClassLoader(final ClassLoader parentLoader, final Object classOverrides) {
return new GeneratedClassLoader(parentLoader, classOverrides);
}
static boolean isAdapterInstance(Object adapter) {
return isGeneratedClass(adapter.getClass());
}
static boolean isGeneratedClass(Class clazz) {
return isGeneratedClassLoader(clazz.getClassLoader());
}
static boolean isGeneratedClassLoader(ClassLoader classLoader) {
return classLoader instanceof GeneratedClassLoader;
}
final class GeneratedClassLoader extends SecureClassLoader implements Supplier {
private final ClassLoader internalLoader;
private final Object classOverrides;
private GeneratedClassLoader(final ClassLoader parentLoader, final Object classOverrides) {
super(parentLoader);
this.internalLoader = GeneratedClassLoader.class.getClassLoader();
this.classOverrides = classOverrides;
}
@Override
public Class loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
// bypass the parent class loader for the generated class and allowed internal classes.
if (isGeneratedClassName(name)) {
return loadGeneratedClass(name, resolve);
}
if (VISIBLE_INTERNAL_CLASS_NAMES.contains(name)) {
return loadInternalClass(name);
}
return super.loadClass(name, resolve);
}
private Class loadGeneratedClass(final String name, final boolean resolve) throws ClassNotFoundException {
synchronized (getClassLoadingLock(name)) {
Class c = findLoadedClass(name);
if (c == null) {
c = findClass(name);
}
if (resolve) {
resolveClass(c);
}
return c;
}
}
private Class loadInternalClass(final String name) throws ClassNotFoundException {
assert VISIBLE_INTERNAL_CLASS_NAMES.contains(name);
return internalLoader != null ? internalLoader.loadClass(name) : Class.forName(name, false, internalLoader);
}
private boolean isGeneratedClassName(final String name) {
return name.equals(className) || name.equals(SERVICE_CLASS_NAME);
}
@Override
protected Class findClass(final String name) throws ClassNotFoundException {
if (name.equals(className)) {
return defineClass(name, classBytes, 0, classBytes.length, GENERATED_PROTECTION_DOMAIN);
}
if (name.equals(SERVICE_CLASS_NAME)) {
byte[] bytes = LazyClassBytes.SERVICE_CLASS_BYTES;
return defineClass(name, bytes, 0, bytes.length, GENERATED_PROTECTION_DOMAIN);
}
throw new ClassNotFoundException(name);
}
@Override
public Value get() {
return Context.getCurrent().asValue(classOverrides);
}
}
private static ProtectionDomain createGeneratedProtectionDomain() {
/*
* Generated classes need to have AllPermission. Since we require the "createClassLoader"
* RuntimePermission, we can create a class loader that'll load new classes with any
* permissions. Our generated classes are just delegating adapters, so having AllPermission
* can't cause anything wrong; the effective set of permissions for the executing script
* functions will still be limited by the permissions of the caller and the permissions of
* the script.
*/
final Permissions permissions = new Permissions();
permissions.add(new AllPermission());
return new ProtectionDomain(new CodeSource(null, (CodeSigner[]) null), permissions);
}
@SuppressWarnings("unchecked")
static Value getClassOverrides(ClassLoader classLoader) {
return ((Supplier) classLoader).get();
}
static byte[] loadClassBytes(String className) {
String classFileName = "/" + className.replace('.', '/') + ".class";
try (InputStream in = Objects.requireNonNull(HostAdapterClassLoader.class.getResourceAsStream(classFileName), className);
ByteArrayOutputStream out = new ByteArrayOutputStream()) {
byte[] buf = new byte[4000];
int n;
while ((n = in.read(buf)) > 0) {
out.write(buf, 0, n);
}
return out.toByteArray();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
}