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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, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* The Universal Permissive License (UPL), Version 1.0
*
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* 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
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* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
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* (a) the Software, and
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* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.polyglot;
import java.util.concurrent.atomic.AtomicInteger;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.polyglot.PolyglotEngineImpl.CancelExecution;
final class PolyglotThread extends Thread {
private final PolyglotLanguageContext languageContext;
private final CallTarget callTarget;
PolyglotThread(PolyglotLanguageContext languageContext, Runnable runnable, ThreadGroup group, long stackSize) {
super(group, runnable, createDefaultName(languageContext), stackSize);
this.languageContext = languageContext;
setUncaughtExceptionHandler(languageContext.getPolyglotExceptionHandler());
this.callTarget = ThreadSpawnRootNode.lookup(languageContext.getLanguageInstance());
}
PolyglotThread(PolyglotLanguageContext languageContext, Runnable runnable, ThreadGroup group) {
this(languageContext, runnable, group, 0);
}
PolyglotThread(PolyglotLanguageContext languageContext, Runnable runnable) {
this(languageContext, runnable, null, 0);
}
private static String createDefaultName(PolyglotLanguageContext creator) {
return "Polyglot-" + creator.language.getId() + "-" + THREAD_INIT_NUMBER.getAndIncrement();
}
boolean isOwner(PolyglotContextImpl testContext) {
return languageContext.context == testContext;
}
@Override
public void run() {
// always call through a HostToGuestRootNode so that stack/frame
// walking can determine in which context the frame was executed
callTarget.call(languageContext, this, new PolyglotThreadRunnable() {
@Override
@TruffleBoundary
public void execute() {
PolyglotThread.super.run();
}
});
}
private static final AtomicInteger THREAD_INIT_NUMBER = new AtomicInteger(0);
// replacing Runnable with dedicated interface to avoid having Runnable.run() on the fast path,
// since SVM will otherwise pull in all Runnable implementations as runtime compiled methods
private interface PolyglotThreadRunnable {
void execute();
}
static final class ThreadSpawnRootNode extends RootNode {
ThreadSpawnRootNode(PolyglotLanguageInstance languageInstance) {
super(languageInstance.spi);
}
@Override
public Object execute(VirtualFrame frame) {
Object[] args = frame.getArguments();
return executeImpl((PolyglotLanguageContext) args[0], (PolyglotThread) args[1], (PolyglotThreadRunnable) args[2]);
}
@TruffleBoundary
private static Object executeImpl(PolyglotLanguageContext languageContext, PolyglotThread thread, PolyglotThreadRunnable run) {
Object[] prev = languageContext.enterThread(thread);
assert prev == null; // is this assertion correct?
try {
run.execute();
} catch (CancelExecution cancel) {
if (PolyglotEngineOptions.TriggerUncaughtExceptionHandlerForCancel.getValue(languageContext.context.engine.getEngineOptionValues())) {
throw cancel;
} else {
return null;
}
} finally {
languageContext.leaveAndDisposePolyglotThread(prev, thread);
}
return null;
}
@Override
public boolean isInternal() {
return true;
}
public static CallTarget lookup(PolyglotLanguageInstance languageInstance) {
CallTarget target = languageInstance.lookupCallTarget(ThreadSpawnRootNode.class);
if (target == null) {
target = languageInstance.installCallTarget(new ThreadSpawnRootNode(languageInstance));
}
return target;
}
}
}