Mercurial > hg > truffle
diff truffle/com.oracle.truffle.api.vm/src/com/oracle/truffle/api/vm/TruffleVM.java @ 22128:f879b1fe3773
Separating the TruffleVM into its own project makes it possible to cleanup various system parts interations
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Thu, 03 Sep 2015 16:38:45 +0200 |
parents | |
children | 0589cc5cab30 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/truffle/com.oracle.truffle.api.vm/src/com/oracle/truffle/api/vm/TruffleVM.java Thu Sep 03 16:38:45 2015 +0200 @@ -0,0 +1,883 @@ +/* + * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package com.oracle.truffle.api.vm; + +import com.oracle.truffle.api.*; +import com.oracle.truffle.api.TruffleLanguage.Env; +import com.oracle.truffle.api.TruffleLanguage.Registration; +import com.oracle.truffle.api.debug.*; +import com.oracle.truffle.api.impl.*; +import com.oracle.truffle.api.instrument.*; +import com.oracle.truffle.api.source.*; +import java.io.*; +import java.net.*; +import java.nio.file.*; +import java.util.*; +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.Executor; +import java.util.logging.*; + +/** + * <em>Virtual machine</em> for Truffle based languages. Term virtual machine is a bit overloaded, + * so don't think of <em>Java virtual machine</em> here - while we are running and using + * {@link TruffleVM} inside of a <em>JVM</em> there can be multiple instances (some would say + * tenants) of {@link TruffleVM} running next to each other in a single <em>JVM</em> with a complete + * mutual isolation. There is 1:N mapping between <em>JVM</em> and {@link TruffleVM}. + * <p> + * It would not be correct to think of a {@link TruffleVM} as a runtime for a single Truffle + * language (Ruby, Python, R, C, JavaScript, etc.) either. {@link TruffleVM} can host as many of + * Truffle languages as {@link Registration registered on a class path} of your <em>JVM</em> + * application. {@link TruffleVM} orchestrates these languages, manages exchange of objects and + * calls among them. While it may happen that there is just one activated language inside of a + * {@link TruffleVM}, the greatest strength of {@link TruffleVM} is in interoperability between all + * Truffle languages. There is 1:N mapping between {@link TruffleVM} and {@link TruffleLanguage + * Truffle language implementations}. + * <p> + * Use {@link #newVM()} to create new isolated virtual machine ready for execution of various + * languages. All the languages in a single virtual machine see each other exported global symbols + * and can cooperate. Use {@link #newVM()} multiple times to create different, isolated virtual + * machines completely separated from each other. + * <p> + * Once instantiated use {@link #eval(java.net.URI)} with a reference to a file or URL or directly + * pass code snippet into the virtual machine via {@link #eval(java.lang.String, java.lang.String)}. + * Support for individual languages is initialized on demand - e.g. once a file of certain MIME type + * is about to be processed, its appropriate engine (if found), is initialized. Once an engine gets + * initialized, it remains so, until the virtual machine isn't garbage collected. + * <p> + * The <code>TruffleVM</code> is single-threaded and tries to enforce that. It records the thread it + * has been {@link Builder#build() created} by and checks that all subsequent calls are coming from + * the same thread. There is 1:1 mapping between {@link TruffleVM} and a thread that can tell it + * what to do. + */ +@SuppressWarnings("rawtypes") +public final class TruffleVM { + private static final Logger LOG = Logger.getLogger(TruffleVM.class.getName()); + private static final SPIAccessor SPI = new SPIAccessor(); + private final Thread initThread; + private final Executor executor; + private final Map<String, Language> langs; + private final Reader in; + private final Writer err; + private final Writer out; + private final EventConsumer<?>[] handlers; + private final Map<String, Object> globals; + private Debugger debugger; + + /** + * Private & temporary only constructor. + */ + private TruffleVM() { + this.initThread = null; + this.in = null; + this.err = null; + this.out = null; + this.langs = null; + this.handlers = null; + this.globals = null; + this.executor = null; + } + + /** + * Real constructor used from the builder. + */ + private TruffleVM(Executor executor, Map<String, Object> globals, Writer out, Writer err, Reader in, EventConsumer<?>[] handlers) { + this.executor = executor; + this.out = out; + this.err = err; + this.in = in; + this.handlers = handlers; + this.initThread = Thread.currentThread(); + this.globals = new HashMap<>(globals); + this.langs = new HashMap<>(); + Enumeration<URL> en; + try { + en = loader().getResources("META-INF/truffle/language"); + } catch (IOException ex) { + throw new IllegalStateException("Cannot read list of Truffle languages", ex); + } + while (en.hasMoreElements()) { + URL u = en.nextElement(); + Properties p; + try { + p = new Properties(); + try (InputStream is = u.openStream()) { + p.load(is); + } + } catch (IOException ex) { + LOG.log(Level.CONFIG, "Cannot process " + u + " as language definition", ex); + continue; + } + for (int cnt = 1;; cnt++) { + String prefix = "language" + cnt + "."; + if (p.getProperty(prefix + "name") == null) { + break; + } + Language l = new Language(prefix, p); + for (String mimeType : l.getMimeTypes()) { + langs.put(mimeType, l); + } + } + } + } + + static ClassLoader loader() { + ClassLoader l = TruffleVM.class.getClassLoader(); + if (l == null) { + l = ClassLoader.getSystemClassLoader(); + } + return l; + } + + /** + * Creation of new Truffle virtual machine. Use the {@link Builder} methods to configure your + * virtual machine and then create one using {@link Builder#build()}: + * + * <pre> + * {@link TruffleVM} vm = {@link TruffleVM}.{@link TruffleVM#newVM() newVM()} + * .{@link Builder#stdOut(java.io.Writer) stdOut}({@link Writer yourWriter}) + * .{@link Builder#stdErr(java.io.Writer) stdErr}({@link Writer yourWriter}) + * .{@link Builder#stdIn(java.io.Reader) stdIn}({@link Reader yourReader}) + * .{@link Builder#build() build()}; + * </pre> + * + * It searches for {@link Registration languages registered} in the system class loader and + * makes them available for later evaluation via + * {@link #eval(java.lang.String, java.lang.String)} methods. + * + * @return new, isolated virtual machine with pre-registered languages + */ + public static TruffleVM.Builder newVM() { + // making Builder non-static inner class is a + // nasty trick to avoid the Builder class to appear + // in Javadoc next to TruffleVM class + TruffleVM vm = new TruffleVM(); + return vm.new Builder(); + } + + /** + * Builder for a new {@link TruffleVM}. Call various configuration methods in a chain and at the + * end create new {@link TruffleVM virtual machine}: + * + * <pre> + * {@link TruffleVM} vm = {@link TruffleVM}.{@link TruffleVM#newVM() newVM()} + * .{@link Builder#stdOut(java.io.Writer) stdOut}({@link Writer yourWriter}) + * .{@link Builder#stdErr(java.io.Writer) stdErr}({@link Writer yourWriter}) + * .{@link Builder#stdIn(java.io.Reader) stdIn}({@link Reader yourReader}) + * .{@link Builder#build() build()}; + * </pre> + */ + public final class Builder { + private Writer out; + private Writer err; + private Reader in; + private final List<EventConsumer<?>> handlers = new ArrayList<>(); + private final Map<String, Object> globals = new HashMap<>(); + private Executor executor; + + Builder() { + } + + /** + * Changes the default output for languages running in <em>to be created</em> + * {@link TruffleVM virtual machine}. The default is to use {@link System#out}. + * + * @param w the writer to use as output + * @return instance of this builder + */ + public Builder stdOut(Writer w) { + out = w; + return this; + } + + /** + * Changes the error output for languages running in <em>to be created</em> + * {@link TruffleVM virtual machine}. The default is to use {@link System#err}. + * + * @param w the writer to use as output + * @return instance of this builder + */ + public Builder stdErr(Writer w) { + err = w; + return this; + } + + /** + * Changes the default input for languages running in <em>to be created</em> + * {@link TruffleVM virtual machine}. The default is to use {@link System#out}. + * + * @param r the reader to use as input + * @return instance of this builder + */ + public Builder stdIn(Reader r) { + in = r; + return this; + } + + /** + * Registers another instance of {@link EventConsumer} into the to be created + * {@link TruffleVM}. + * + * @param handler the handler to register + * @return instance of this builder + */ + public Builder onEvent(EventConsumer<?> handler) { + handler.getClass(); + handlers.add(handler); + return this; + } + + /** + * Adds global named symbol into the configuration of to-be-built {@link TruffleVM}. This + * symbol will be accessible to all languages via {@link Env#importSymbol(java.lang.String)} + * and will take precedence over {@link TruffleLanguage#findExportedSymbol symbols exported + * by languages itself}. Repeated use of <code>globalSymbol</code> is possible; later + * definition of the same name overrides the previous one. + * + * @param name name of the symbol to register + * @param obj value of the object - expected to be primitive wrapper, {@link String} or + * <code>TruffleObject</code> for mutual inter-operability + * @return instance of this builder + * @see TruffleVM#findGlobalSymbol(java.lang.String) + */ + public Builder globalSymbol(String name, Object obj) { + globals.put(name, obj); + return this; + } + + /** + * Provides own executor for running {@link TruffleVM} scripts. By default + * {@link TruffleVM#eval(com.oracle.truffle.api.source.Source)} and + * {@link Symbol#invoke(java.lang.Object, java.lang.Object...)} are executed synchronously + * in the calling thread. Sometimes, however it is more beneficial to run them + * asynchronously - the easiest way to do so is to provide own executor when configuring the + * { {@link #executor(java.util.concurrent.Executor) the builder}. The executor is expected + * to execute all {@link Runnable runnables} passed into its + * {@link Executor#execute(java.lang.Runnable)} method in the order they arrive and in a + * single (yet arbitrary) thread. + * + * @param executor the executor to use for internal execution inside the {@link #build() to + * be created} {@link TruffleVM} + * @return instance of this builder + */ + @SuppressWarnings("hiding") + public Builder executor(Executor executor) { + this.executor = executor; + return this; + } + + /** + * Creates the {@link TruffleVM Truffle virtual machine}. The configuration is taken from + * values passed into configuration methods in this class. + * + * @return new, isolated virtual machine with pre-registered languages + */ + public TruffleVM build() { + if (out == null) { + out = new OutputStreamWriter(System.out); + } + if (err == null) { + err = new OutputStreamWriter(System.err); + } + if (in == null) { + in = new InputStreamReader(System.in); + } + Executor nonNullExecutor = executor != null ? executor : new Executor() { + @Override + public void execute(Runnable command) { + command.run(); + } + }; + return new TruffleVM(nonNullExecutor, globals, out, err, in, handlers.toArray(new EventConsumer[0])); + } + } + + /** + * Descriptions of languages supported in this Truffle virtual machine. + * + * @return an immutable map with keys being MIME types and values the {@link Language + * descriptions} of associated languages + */ + public Map<String, Language> getLanguages() { + return Collections.unmodifiableMap(langs); + } + + /** + * Evaluates file located on a given URL. Is equivalent to loading the content of a file and + * executing it via {@link #eval(java.lang.String, java.lang.String)} with a MIME type guess + * based on the file's extension and/or content. + * + * @param location the location of a file to execute + * @return result of a processing the file, possibly <code>null</code> + * @throws IOException exception to signal I/O problems or problems with processing the file's + * content + * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} + */ + @Deprecated + public Object eval(URI location) throws IOException { + checkThread(); + Source s; + String mimeType; + if (location.getScheme().equals("file")) { + File file = new File(location); + s = Source.fromFileName(file.getPath(), true); + if (file.getName().endsWith(".c")) { + mimeType = "text/x-c"; + } else if (file.getName().endsWith(".sl")) { + mimeType = "application/x-sl"; + } else if (file.getName().endsWith(".R") || file.getName().endsWith(".r")) { + mimeType = "application/x-r"; + } else { + mimeType = Files.probeContentType(file.toPath()); + } + } else { + URL url = location.toURL(); + s = Source.fromURL(url, location.toString()); + URLConnection conn = url.openConnection(); + mimeType = conn.getContentType(); + } + Language l = langs.get(mimeType); + if (l == null) { + throw new IOException("No language for " + location + " with MIME type " + mimeType + " found. Supported types: " + langs.keySet()); + } + return eval(l, s).get(); + } + + /** + * Evaluates code snippet. Chooses a language registered for a given MIME type (throws + * {@link IOException} if there is none). And passes the specified code to it for execution. + * + * @param mimeType MIME type of the code snippet - chooses the right language + * @param reader the source of code snippet to execute + * @return result of an execution, possibly <code>null</code> + * @throws IOException thrown to signal errors while processing the code + * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} + */ + @Deprecated + public Object eval(String mimeType, Reader reader) throws IOException { + checkThread(); + Language l = langs.get(mimeType); + if (l == null) { + throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); + } + return eval(l, Source.fromReader(reader, mimeType)).get(); + } + + /** + * Evaluates code snippet. Chooses a language registered for a given MIME type (throws + * {@link IOException} if there is none). And passes the specified code to it for execution. + * + * @param mimeType MIME type of the code snippet - chooses the right language + * @param code the code snippet to execute + * @return result of an execution, possibly <code>null</code> + * @throws IOException thrown to signal errors while processing the code + * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} + */ + @Deprecated + public Object eval(String mimeType, String code) throws IOException { + checkThread(); + Language l = langs.get(mimeType); + if (l == null) { + throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); + } + return eval(l, Source.fromText(code, mimeType)).get(); + } + + /** + * Evaluates provided source. Chooses language registered for a particular + * {@link Source#getMimeType() MIME type} (throws {@link IOException} if there is none). The + * language is then allowed to parse and execute the source. + * + * @param source code snippet to execute + * @return a {@link Symbol} object that holds result of an execution, never <code>null</code> + * @throws IOException thrown to signal errors while processing the code + */ + public Symbol eval(Source source) throws IOException { + String mimeType = source.getMimeType(); + checkThread(); + Language l = langs.get(mimeType); + if (l == null) { + throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); + } + return eval(l, source); + } + + private Symbol eval(final Language l, final Source s) throws IOException { + final Debugger[] fillIn = {debugger}; + final Object[] result = {null, null}; + final CountDownLatch ready = new CountDownLatch(1); + final TruffleLanguage[] lang = {null}; + executor.execute(new Runnable() { + @Override + public void run() { + TruffleLanguage<?> langImpl = l.getImpl(); + lang[0] = langImpl; + TruffleVM.findDebuggerSupport(langImpl); + evalImpl(fillIn, s, result, langImpl, ready); + } + }); + exceptionCheck(result); + return new Symbol(lang[0], result, ready); + } + + private void evalImpl(Debugger[] fillIn, Source s, Object[] result, TruffleLanguage<?> l, CountDownLatch ready) { + try (Closeable d = SPI.executionStart(this, fillIn, s)) { + if (debugger == null) { + debugger = fillIn[0]; + } + result[0] = SPI.eval(l, s); + } catch (IOException ex) { + result[1] = ex; + } finally { + ready.countDown(); + } + } + + /** + * Looks global symbol provided by one of initialized languages up. First of all execute your + * program via one of your {@link #eval(java.lang.String, java.lang.String)} and then look + * expected symbol up using this method. + * <p> + * The names of the symbols are language dependent, but for example the Java language bindings + * follow the specification for method references: + * <ul> + * <li>"java.lang.Exception::new" is a reference to constructor of {@link Exception} + * <li>"java.lang.Integer::valueOf" is a reference to static method in {@link Integer} class + * </ul> + * Once an symbol is obtained, it remembers values for fast access and is ready for being + * invoked. + * + * @param globalName the name of the symbol to find + * @return found symbol or <code>null</code> if it has not been found + */ + public Symbol findGlobalSymbol(final String globalName) { + checkThread(); + final TruffleLanguage<?>[] lang = {null}; + final Object[] obj = {globals.get(globalName), null}; + final CountDownLatch ready = new CountDownLatch(1); + if (obj[0] == null) { + executor.execute(new Runnable() { + @Override + public void run() { + findGlobalSymbolImpl(obj, globalName, lang, ready); + } + }); + try { + ready.await(); + } catch (InterruptedException ex) { + LOG.log(Level.SEVERE, null, ex); + } + } else { + ready.countDown(); + } + return obj[0] == null ? null : new Symbol(lang[0], obj, ready); + } + + private void findGlobalSymbolImpl(Object[] obj, String globalName, TruffleLanguage<?>[] lang, CountDownLatch ready) { + if (obj[0] == null) { + for (Language dl : langs.values()) { + TruffleLanguage<?> l = dl.getImpl(); + obj[0] = SPI.findExportedSymbol(dl.getEnv(), globalName, true); + if (obj[0] != null) { + lang[0] = l; + break; + } + } + } + if (obj[0] == null) { + for (Language dl : langs.values()) { + TruffleLanguage<?> l = dl.getImpl(); + obj[0] = SPI.findExportedSymbol(dl.getEnv(), globalName, false); + if (obj[0] != null) { + lang[0] = l; + break; + } + } + } + ready.countDown(); + } + + private void checkThread() { + if (initThread != Thread.currentThread()) { + throw new IllegalStateException("TruffleVM created on " + initThread.getName() + " but used on " + Thread.currentThread().getName()); + } + } + + @SuppressWarnings("unchecked") + void dispatch(Object ev) { + Class type = ev.getClass(); + if (type == SuspendedEvent.class) { + dispatchSuspendedEvent((SuspendedEvent) ev); + } + if (type == ExecutionEvent.class) { + dispatchExecutionEvent((ExecutionEvent) ev); + } + dispatch(type, ev); + } + + @SuppressWarnings("unused") + void dispatchSuspendedEvent(SuspendedEvent event) { + } + + @SuppressWarnings("unused") + void dispatchExecutionEvent(ExecutionEvent event) { + } + + @SuppressWarnings("unchecked") + <Event> void dispatch(Class<Event> type, Event event) { + for (EventConsumer handler : handlers) { + if (handler.type == type) { + handler.on(event); + } + } + } + + static void exceptionCheck(Object[] result) throws RuntimeException, IOException { + if (result[1] instanceof IOException) { + throw (IOException) result[1]; + } + if (result[1] instanceof RuntimeException) { + throw (RuntimeException) result[1]; + } + } + + /** + * Represents {@link TruffleVM#findGlobalSymbol(java.lang.String) global symbol} provided by one + * of the initialized languages in {@link TruffleVM Truffle virtual machine}. + */ + public class Symbol { + private final TruffleLanguage<?> language; + private final Object[] result; + private final CountDownLatch ready; + private CallTarget target; + + Symbol(TruffleLanguage<?> language, Object[] result, CountDownLatch ready) { + this.language = language; + this.result = result; + this.ready = ready; + } + + /** + * Obtains the object represented by this symbol. The <em>raw</em> object can either be a + * wrapper about primitive type (e.g. {@link Number}, {@link String}, {@link Character}, + * {@link Boolean}) or a <em>TruffleObject</em> representing more complex object from a + * language. The method can return <code>null</code>. + * + * @return the object or <code>null</code> + * @throws IOException in case it is not possible to obtain the value of the object + */ + public Object get() throws IOException { + waitForSymbol(); + exceptionCheck(result); + return result[0]; + } + + /** + * Invokes the symbol. If the symbol represents a function, then it should be invoked with + * provided arguments. If the symbol represents a field, then first argument (if provided) + * should set the value to the field; the return value should be the actual value of the + * field when the <code>invoke</code> method returns. + * + * @param thiz this/self in language that support such concept; use <code>null</code> to let + * the language use default this/self or ignore the value + * @param args arguments to pass when invoking the symbol + * @return symbol wrapper around the value returned by invoking the symbol, never + * <code>null</code> + * @throws IOException signals problem during execution + */ + public Symbol invoke(final Object thiz, final Object... args) throws IOException { + get(); + final Debugger[] fillIn = {debugger}; + final CountDownLatch done = new CountDownLatch(1); + final Object[] res = {null, null}; + executor.execute(new Runnable() { + @Override + public void run() { + invokeImpl(fillIn, thiz, args, res, done); + } + }); + exceptionCheck(res); + return new Symbol(language, res, done); + } + + private void invokeImpl(Debugger[] fillIn, Object thiz, Object[] args, Object[] res, CountDownLatch done) { + try (final Closeable c = SPI.executionStart(TruffleVM.this, fillIn, null)) { + if (debugger == null) { + debugger = fillIn[0]; + } + List<Object> arr = new ArrayList<>(); + if (thiz == null && language != null) { + Object global = SPI.languageGlobal(SPI.findLanguage(TruffleVM.this, language.getClass())); + if (global != null) { + arr.add(global); + } + } else { + arr.add(thiz); + } + arr.addAll(Arrays.asList(args)); + for (;;) { + try { + if (target == null) { + target = SPI.createCallTarget(language, result[0], arr.toArray()); + } + res[0] = target.call(arr.toArray()); + break; + } catch (SymbolInvoker.ArgumentsMishmashException ex) { + target = null; + } + } + } catch (IOException ex) { + res[1] = ex; + } catch (RuntimeException ex) { + res[1] = ex; + } finally { + done.countDown(); + } + } + + private void waitForSymbol() throws InterruptedIOException { + checkThread(); + try { + ready.await(); + } catch (InterruptedException ex) { + throw (InterruptedIOException) new InterruptedIOException(ex.getMessage()).initCause(ex); + } + } + } + + /** + * Description of a language registered in {@link TruffleVM Truffle virtual machine}. Languages + * are registered by {@link Registration} annotation which stores necessary information into a + * descriptor inside of the language's JAR file. When a new {@link TruffleVM} is created, it + * reads all available descriptors and creates {@link Language} objects to represent them. One + * can obtain a {@link #getName() name} or list of supported {@link #getMimeTypes() MIME types} + * for each language. The actual language implementation is not initialized until + * {@link TruffleVM#eval(java.lang.String, java.lang.String) a code is evaluated} in it. + */ + public final class Language { + private final Properties props; + private TruffleLanguage<?> impl; + private TruffleLanguage.Env env; + private final String prefix; + private String shortName; + + Language(String prefix, Properties props) { + this.prefix = prefix; + this.props = props; + } + + /** + * MIME types recognized by the language. + * + * @return returns immutable set of recognized MIME types + */ + public Set<String> getMimeTypes() { + TreeSet<String> ts = new TreeSet<>(); + for (int i = 0;; i++) { + String mt = props.getProperty(prefix + "mimeType." + i); + if (mt == null) { + break; + } + ts.add(mt); + } + return Collections.unmodifiableSet(ts); + } + + /** + * Human readable name of the language. Think of C, Ruby, JS, etc. + * + * @return string giving the language a name + */ + public String getName() { + return props.getProperty(prefix + "name"); + } + + /** + * Name of the language version. + * + * @return string specifying the language version + */ + public String getVersion() { + return props.getProperty(prefix + "version"); + } + + /** + * Human readable string that identifies the language and version. + * + * @return string describing the specific language version + */ + public String getShortName() { + if (shortName == null) { + shortName = getName() + "(" + getVersion() + ")"; + } + return shortName; + } + + TruffleLanguage<?> getImpl() { + if (impl == null) { + String n = props.getProperty(prefix + "className"); + try { + impl = LanguageCache.find(n, loader()); + env = SPI.attachEnv(TruffleVM.this, impl, out, err, in); + } catch (Exception ex) { + throw new IllegalStateException("Cannot initialize " + getShortName() + " language with implementation " + n, ex); + } + } + return impl; + } + + @Override + public String toString() { + return "[" + getShortName() + " for " + getMimeTypes() + "]"; + } + + TruffleLanguage.Env getEnv() { + if (env == null) { + env = SPI.attachEnv(TruffleVM.this, impl, out, err, in); + } + return env; + } + } // end of Language + + // + // Accessor helper methods + // + + TruffleLanguage<?> findLanguage(Probe probe) { + Class<? extends TruffleLanguage> languageClazz = SPI.findLanguage(probe); + for (Map.Entry<String, Language> entrySet : langs.entrySet()) { + Language languageDescription = entrySet.getValue(); + if (languageClazz.isInstance(languageDescription.impl)) { + return languageDescription.impl; + } + } + throw new IllegalStateException("Cannot find language " + languageClazz + " among " + langs); + } + + Env findEnv(Class<? extends TruffleLanguage> languageClazz) { + for (Map.Entry<String, Language> entrySet : langs.entrySet()) { + Language languageDescription = entrySet.getValue(); + if (languageClazz.isInstance(languageDescription.impl)) { + return languageDescription.getEnv(); + } + } + throw new IllegalStateException("Cannot find language " + languageClazz + " among " + langs); + } + + static DebugSupportProvider findDebuggerSupport(TruffleLanguage<?> l) { + return SPI.getDebugSupport(l); + } + + private static class SPIAccessor extends Accessor { + @Override + public Object importSymbol(Object vmObj, TruffleLanguage<?> ownLang, String globalName) { + TruffleVM vm = (TruffleVM) vmObj; + Object g = vm.globals.get(globalName); + if (g != null) { + return g; + } + Set<Language> uniqueLang = new LinkedHashSet<>(vm.langs.values()); + for (Language dl : uniqueLang) { + TruffleLanguage<?> l = dl.getImpl(); + if (l == ownLang) { + continue; + } + Object obj = SPI.findExportedSymbol(dl.getEnv(), globalName, true); + if (obj != null) { + return obj; + } + } + for (Language dl : uniqueLang) { + TruffleLanguage<?> l = dl.getImpl(); + if (l == ownLang) { + continue; + } + Object obj = SPI.findExportedSymbol(dl.getEnv(), globalName, false); + if (obj != null) { + return obj; + } + } + return null; + } + + @Override + public Env attachEnv(Object obj, TruffleLanguage<?> language, Writer stdOut, Writer stdErr, Reader stdIn) { + TruffleVM vm = (TruffleVM) obj; + return super.attachEnv(vm, language, stdOut, stdErr, stdIn); + } + + @Override + public Object eval(TruffleLanguage<?> l, Source s) throws IOException { + return super.eval(l, s); + } + + @Override + public Object findExportedSymbol(TruffleLanguage.Env env, String globalName, boolean onlyExplicit) { + return super.findExportedSymbol(env, globalName, onlyExplicit); + } + + @Override + protected Object languageGlobal(TruffleLanguage.Env env) { + return super.languageGlobal(env); + } + + @Override + protected CallTarget createCallTarget(TruffleLanguage<?> lang, Object obj, Object[] args) throws IOException { + return super.createCallTarget(lang, obj, args); + } + + @Override + public ToolSupportProvider getToolSupport(TruffleLanguage<?> l) { + return super.getToolSupport(l); + } + + @Override + public DebugSupportProvider getDebugSupport(TruffleLanguage<?> l) { + return super.getDebugSupport(l); + } + + @Override + protected Class<? extends TruffleLanguage> findLanguage(Probe probe) { + return super.findLanguage(probe); + } + + @Override + protected Env findLanguage(Object obj, Class<? extends TruffleLanguage> languageClass) { + TruffleVM vm = (TruffleVM) obj; + return vm.findEnv(languageClass); + } + + @Override + protected Closeable executionStart(Object obj, Debugger[] fillIn, Source s) { + TruffleVM vm = (TruffleVM) obj; + return super.executionStart(vm, fillIn, s); + } + + @Override + protected void dispatchEvent(Object obj, Object event) { + TruffleVM vm = (TruffleVM) obj; + vm.dispatch(event); + } + } // end of SPIAccessor +}