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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2018, 2021, 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
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* SOFTWARE.
*/
package com.oracle.truffle.polyglot;
import java.util.Objects;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.nodes.RootNode;
abstract class HostToGuestRootNode extends RootNode {
// offset used to indicate where the argument start.
// first two arguments are language context and receiver.
protected static final int ARGUMENT_OFFSET = 2;
@CompilationFinal private boolean seenEnter;
@CompilationFinal private boolean seenNonEnter;
private final PolyglotLanguage language;
private final PolyglotSharingLayer layer;
@CompilationFinal private boolean seenError;
/*
* This constructor is only used for uncached locations. Which will never get executed.
*/
HostToGuestRootNode(PolyglotSharingLayer layer) {
super(null);
assert layer != null;
this.layer = layer;
this.language = null;
EngineAccessor.NODES.setSharingLayer(this, layer);
}
HostToGuestRootNode(PolyglotLanguageInstance language) {
super(null);
EngineAccessor.NODES.setSharingLayer(this, language.sharing);
this.layer = language.sharing;
this.language = language.language;
}
protected abstract Class getReceiverType();
@Override
public final Object execute(VirtualFrame frame) {
Object[] args = frame.getArguments();
PolyglotLanguageContext languageContext = layer.getSingleConstantLanguageContext(language);
if (languageContext == null) {
languageContext = (PolyglotLanguageContext) args[0];
}
PolyglotContextImpl constantContext = layer.getSingleConstantContext();
if (constantContext == null) {
constantContext = languageContext.context;
}
assert languageContext.context == constantContext;
PolyglotContextImpl context = constantContext;
assert Objects.equals(layer, languageContext.context.layer) : PolyglotSharingLayer.invalidSharingError(this, layer, languageContext.context.layer);
Object[] prev;
boolean needsEnter;
try {
needsEnter = layer.engine.needsEnter(context);
if (needsEnter) {
if (!seenEnter) {
CompilerDirectives.transferToInterpreterAndInvalidate();
seenEnter = true;
}
prev = layer.engine.enterCached(context, true);
} else {
if (!seenNonEnter) {
CompilerDirectives.transferToInterpreterAndInvalidate();
seenNonEnter = true;
}
prev = null;
}
} catch (Throwable e) {
throw handleException(languageContext, e, false, RuntimeException.class);
}
try {
Object[] arguments = frame.getArguments();
Object receiver = getReceiverType().cast(arguments[1]);
Object result;
result = executeImpl(languageContext, receiver, arguments);
assert !(result instanceof TruffleObject);
return result;
} catch (Throwable e) {
throw handleException(languageContext, e, true, RuntimeException.class);
} finally {
if (needsEnter) {
try {
layer.engine.leaveCached(prev, context);
} catch (Throwable e) {
throw handleException(languageContext, e, false, RuntimeException.class);
}
}
}
}
@SuppressWarnings({"unchecked", "unused"})
private E handleException(PolyglotLanguageContext languageContext, Throwable e, boolean entered, Class exceptionType) throws E {
if (!seenError) {
CompilerDirectives.transferToInterpreterAndInvalidate();
seenError = true;
}
throw PolyglotImpl.guestToHostException(languageContext, e, entered);
}
protected abstract Object executeImpl(PolyglotLanguageContext languageContext, Object receiver, Object[] args);
static T installHostCodeCache(PolyglotLanguageContext languageContext, Object key, T value, Class expectedType) {
T result = expectedType.cast(languageContext.getLanguageInstance().hostToGuestCodeCache.putIfAbsent(key, value));
if (result != null) {
return result;
} else {
return value;
}
}
static T lookupHostCodeCache(PolyglotLanguageContext languageContext, Object key, Class expectedType) {
return expectedType.cast(languageContext.getLanguageInstance().hostToGuestCodeCache.get(key));
}
}