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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2017, 2022, 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.host;
import static com.oracle.truffle.api.CompilerDirectives.shouldNotReachHere;
import org.graalvm.polyglot.HostAccess;
import org.graalvm.polyglot.impl.AbstractPolyglotImpl;
import org.graalvm.polyglot.impl.AbstractPolyglotImpl.APIAccess;
import org.graalvm.polyglot.impl.AbstractPolyglotImpl.AbstractHostAccess;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.exception.AbstractTruffleException;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.host.HostMethodScope.ScopedObject;
/*
* Java host language implementation.
*/
final class HostLanguage extends TruffleLanguage {
@CompilationFinal HostClassCache hostClassCache; // effectively final
final AbstractHostAccess access;
final AbstractPolyglotImpl polyglot;
final APIAccess api;
final HostLanguageService service;
@CompilationFinal private boolean methodScopingEnabled;
HostLanguage(AbstractPolyglotImpl polyglot, AbstractHostAccess hostAccess) {
this.polyglot = polyglot;
this.access = hostAccess;
this.api = polyglot.getAPIAccess();
this.service = new HostLanguageService(polyglot, this);
}
@Override
protected boolean patchContext(HostContext context, Env newEnv) {
return true;
}
@Override
protected HostContext createContext(com.oracle.truffle.api.TruffleLanguage.Env env) {
env.registerService(service);
return new HostContext(this, env);
}
static Object unwrapIfScoped(HostLanguage language, Object o) {
if (language == null || !language.methodScopingEnabled) {
return o;
}
return language.unwrapIfScoped(o);
}
@Override
protected Object getScope(HostContext context) {
return context.topScope;
}
@Override
protected boolean isThreadAccessAllowed(Thread thread, boolean singleThreaded) {
return true;
}
private Object unwrapIfScoped(Object obj) {
if (!methodScopingEnabled) {
return obj;
}
Object o = obj;
if (o instanceof ScopedObject) {
o = ((ScopedObject) o).unwrapForGuest();
}
return o;
}
void initializeHostAccess(HostAccess policy, ClassLoader cl) {
if (policy == null) {
// should only happen during context preinitialization
return;
}
HostClassCache cache = HostClassCache.findOrInitialize(access, api, policy, cl);
if (this.hostClassCache != null) {
if (this.hostClassCache.hostAccess.equals(cache.hostAccess)) {
/*
* The cache can be effectively be reused if the same host access configuration
* applies.
*/
} else {
throw HostAccessor.ENGINE.createPolyglotEngineException(new IllegalStateException("Found different host access configuration for a context with a shared engine. " +
"The host access configuration must be the same for all contexts of an engine. " +
"Provide the same host access configuration using the Context.Builder.allowHostAccess method when constructing the context."));
}
} else {
this.hostClassCache = cache;
}
this.methodScopingEnabled = api.isMethodScopingEnabled(policy);
}
@Override
@TruffleBoundary
protected Object getLanguageView(HostContext hostContext, Object value) {
Object wrapped;
if (value instanceof TruffleObject) {
InteropLibrary lib = InteropLibrary.getFactory().getUncached(value);
try {
assert !lib.hasLanguage(value) || lib.getLanguage(value) != HostLanguage.class;
} catch (UnsupportedMessageException e) {
throw shouldNotReachHere(e);
}
wrapped = HostToTypeNode.convertToObject(hostContext, value, lib);
} else {
wrapped = value;
}
return HostObject.forObject(wrapped, hostContext);
}
@Override
protected CallTarget parse(ParsingRequest request) throws Exception {
String sourceString = request.getSource().getCharacters().toString();
return new RootNode(this) {
@Override
public Object execute(VirtualFrame frame) {
return service.findDynamicClass(HostContext.get(this), sourceString);
}
}.getCallTarget();
}
static final LanguageReference REFERENCE = LanguageReference.create(HostLanguage.class);
static HostLanguage get(Node node) {
return REFERENCE.get(node);
}
@Override
protected void disposeContext(HostContext context) {
context.disposeClassLoader();
}
@SuppressWarnings("serial")
static class HostLanguageException extends AbstractTruffleException {
HostLanguageException(String message) {
super(message);
}
}
}