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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
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
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* 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
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package com.oracle.truffle.polyglot;
import static com.oracle.truffle.api.CompilerDirectives.shouldNotReachHere;
import static com.oracle.truffle.polyglot.EngineAccessor.LANGUAGE;
import static com.oracle.truffle.polyglot.EngineAccessor.NODES;
import java.util.Set;
import org.graalvm.options.OptionDescriptors;
import org.graalvm.polyglot.Language;
import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.nodes.LanguageInfo;
import com.oracle.truffle.polyglot.PolyglotLocals.LocalLocation;
final class PolyglotLanguage implements com.oracle.truffle.polyglot.PolyglotImpl.VMObject {
final PolyglotEngineImpl engine;
final LanguageCache cache;
final LanguageInfo info;
Language api; // effectively final
final int engineIndex;
final RuntimeException initError;
private volatile OptionDescriptors options;
private volatile OptionValuesImpl optionValues;
private volatile boolean initialized;
private volatile PolyglotLanguageInstance initLanguage;
private volatile boolean firstInstance = true;
@CompilationFinal volatile Class contextClass;
volatile LocalLocation[] previousContextLocalLocations;
volatile LocalLocation[] previousContextThreadLocalLocations;
PolyglotLanguage(PolyglotEngineImpl engine, LanguageCache cache, int engineIndex, RuntimeException initError) {
this.engine = engine;
this.cache = cache;
this.initError = initError;
this.engineIndex = engineIndex;
this.info = NODES.createLanguage(cache, cache.getId(), cache.getName(), cache.getVersion(), cache.getDefaultMimeType(), cache.getMimeTypes(), cache.isInternal(), cache.isInteractive());
}
PolyglotLanguageContext getCurrentLanguageContext() {
return PolyglotContextImpl.requireContext().contexts[engineIndex];
}
boolean isFirstInstance() {
return firstInstance;
}
void initializeContextClass(Object contextImpl) {
CompilerAsserts.neverPartOfCompilation();
Class newClass = contextImpl == null ? Void.class : contextImpl.getClass();
Class currentClass = contextClass;
if (currentClass == null) {
contextClass = newClass;
} else if (currentClass != newClass) {
throw new IllegalStateException(String.format("Unstable context class expected %s got %s.", newClass, currentClass));
}
}
boolean dependsOn(PolyglotLanguage otherLanguage) {
Set dependentLanguages = cache.getDependentLanguages();
if (dependentLanguages.contains(otherLanguage.getId())) {
return true;
}
for (String dependentLanguage : dependentLanguages) {
PolyglotLanguage dependentLanguageObj = engine.idToLanguage.get(dependentLanguage);
if (dependentLanguageObj != null && dependentLanguageObj.dependsOn(otherLanguage)) {
return true;
}
}
return false;
}
boolean isHost() {
return engineIndex == PolyglotEngineImpl.HOST_LANGUAGE_INDEX;
}
public OptionDescriptors getOptions() {
try {
engine.checkState();
return getOptionsInternal();
} catch (Throwable e) {
throw PolyglotImpl.guestToHostException(this.engine, e);
}
}
OptionDescriptors getOptionsInternal() {
ensureInitialized();
return options;
}
private void ensureInitialized() {
if (!this.initialized) {
synchronized (engine.lock) {
if (!this.initialized) {
ensureInitialized(getInitLanguage());
this.initialized = true;
}
}
}
}
PolyglotLanguageInstance getInitLanguage() {
assert Thread.holdsLock(engine.lock);
if (initLanguage == null) {
this.initLanguage = new PolyglotLanguageInstance(this, null);
}
return initLanguage;
}
@SuppressWarnings("unchecked")
PolyglotLanguageInstance createInstance(PolyglotSharingLayer sharing) {
assert Thread.holdsLock(engine.lock);
if (firstInstance) {
firstInstance = false;
}
PolyglotLanguageInstance instance = null;
if (initLanguage != null) {
// reuse init language
instance = this.initLanguage;
instance.sharing = sharing;
initLanguage = null;
}
if (instance == null) {
instance = new PolyglotLanguageInstance(this, sharing);
ensureInitialized(instance);
}
return instance;
}
@Override
public PolyglotEngineImpl getEngine() {
return engine;
}
private void ensureInitialized(PolyglotLanguageInstance instance) {
if (!initialized) {
synchronized (engine.lock) {
if (!initialized) {
try {
this.options = LANGUAGE.describeOptions(instance.spi, cache.getId());
} catch (Exception e) {
throw new IllegalStateException(String.format("Error initializing language '%s' using class '%s'.", cache.getId(), cache.getClassName()), e);
}
initialized = true;
}
}
}
}
OptionValuesImpl getOptionValues() {
if (optionValues == null) {
synchronized (engine.lock) {
if (optionValues == null) {
optionValues = new OptionValuesImpl(getOptionsInternal(), false);
}
}
}
return optionValues;
}
OptionValuesImpl getOptionValuesIfExists() {
return optionValues;
}
public String getDefaultMimeType() {
return cache.getDefaultMimeType();
}
void clearOptionValues() {
optionValues = null;
}
public String getName() {
return cache.getName();
}
public String getImplementationName() {
return cache.getImplementationName();
}
public boolean isInteractive() {
return cache.isInteractive();
}
public Set getMimeTypes() {
return cache.getMimeTypes();
}
public String getVersion() {
final String version = cache.getVersion();
if (version.equals("inherit")) {
return engine.getVersion();
} else {
return version;
}
}
public String getId() {
return cache.getId();
}
@Override
public String toString() {
return "PolyglotLanguage [id=" + getId() + ", name=" + getName() + ", host=" + isHost() + "]";
}
boolean assertCorrectEngine() {
PolyglotContextImpl context = PolyglotContextImpl.requireContext();
PolyglotLanguageContext languageContext = context.getContext(this);
if (languageContext.isInitialized() && languageContext.language.engine != this.engine) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw shouldNotReachHere(String.format("Context reference was used from an Engine that is currently not entered. " +
"ContextReference of engine %s was used but engine %s is currently entered. " +
"ContextReference must not be shared between multiple Engine instances.",
languageContext.language.engine,
this.engine));
}
return true;
}
String getWebsite() {
return cache.getWebsite();
}
}