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/*
* Copyright (c) 2017, 2018, 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.
*
* 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 static com.oracle.truffle.polyglot.VMAccessor.LANGUAGE;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.source.Source;
final class PolyglotSourceCache {
private final ConcurrentHashMap sourceCache;
private final ReferenceQueue deadSources = new ReferenceQueue<>();
PolyglotSourceCache() {
this.sourceCache = new ConcurrentHashMap<>();
}
CallTarget parseCached(PolyglotLanguageContext context, Source source, String[] argumentNames) {
cleanupStaleEntries();
CallTarget target;
if (source.isCached()) {
Object sourceId = VMAccessor.SOURCE.getSourceIdentifier(source);
WeakSourceKey ref = new WeakSourceKey(sourceId, source, argumentNames, deadSources);
target = sourceCache.get(ref);
if (target == null) {
target = parseImpl(context, argumentNames, VMAccessor.SOURCE.copySource(source));
CallTarget prev = sourceCache.putIfAbsent(ref, target);
if (prev != null) {
/*
* Parsed twice -> discard the one not in the cache.
*/
target = prev;
}
}
} else {
target = parseImpl(context, argumentNames, source);
}
return target;
}
private static CallTarget parseImpl(PolyglotLanguageContext context, String[] argumentNames, Source source) {
if (!VMAccessor.SOURCE.isLegacySource(source)) {
validateSource(context, source);
}
CallTarget parsedTarget = LANGUAGE.parse(context.requireEnv(), source, null, argumentNames);
if (parsedTarget == null) {
throw new IllegalStateException(String.format("Parsing resulted in a null CallTarget for %s.", source));
}
return parsedTarget;
}
private static void validateSource(PolyglotLanguageContext context, Source source) {
String mimeType = source.getMimeType();
Set mimeTypes = context.language.cache.getMimeTypes();
if (mimeType != null && !mimeTypes.contains(mimeType)) {
throw new PolyglotIllegalArgumentException(String.format("Error evaluating the source. The language %s does not support MIME type %s. Supported MIME types are %s.",
source.getLanguage(), mimeType, mimeTypes));
}
String activeMimeType = mimeType;
if (activeMimeType == null) {
activeMimeType = context.language.cache.getDefaultMimeType();
}
boolean expectCharacters = activeMimeType != null ? context.language.cache.isCharacterMimeType(activeMimeType) : true;
if (mimeType != null && source.hasCharacters() != expectCharacters) {
if (source.hasBytes()) {
throw new PolyglotIllegalArgumentException(
String.format("Error evaluating the source. MIME type '%s' is character based for language '%s' but the source contents are byte based.", mimeType,
source.getLanguage()));
} else {
throw new PolyglotIllegalArgumentException(
String.format("Error evaluating the source. MIME type '%s' is byte based for language '%s' but the source contents are character based.", mimeType,
source.getLanguage()));
}
}
if (source.hasCharacters() != expectCharacters) {
Set binaryMimeTypes = new HashSet<>();
Set characterMimeTypes = new HashSet<>();
for (String supportedMimeType : mimeTypes) {
if (context.language.cache.isCharacterMimeType(supportedMimeType)) {
characterMimeTypes.add(supportedMimeType);
} else {
binaryMimeTypes.add(supportedMimeType);
}
}
if (expectCharacters) {
if (binaryMimeTypes.isEmpty()) {
throw new PolyglotIllegalArgumentException(String.format(
"Error evaluating the source. The language %s only supports character based sources but a binary based source was provided.",
source.getLanguage()));
} else {
throw new PolyglotIllegalArgumentException(String.format(
"Error evaluating the source. The language %s expects character based sources by default but a binary based source was provided. " +
"Provide a binary based source instead or specify a MIME type for the source. " +
"Available MIME types for binary based sources are %s.",
source.getLanguage(), binaryMimeTypes));
}
} else {
if (characterMimeTypes.isEmpty()) {
throw new PolyglotIllegalArgumentException(String.format(
"Error evaluating the source. The language %s only supports binary based sources but a character based source was provided.",
source.getLanguage()));
} else {
throw new PolyglotIllegalArgumentException(String.format(
"Error evaluating the source. The language %s expects character based sources by default but a binary based source was provided. " +
"Provide a character based source instead or specify a MIME type for the source. " +
"Available MIME types for character based sources are %s.",
source.getLanguage(), characterMimeTypes));
}
}
}
}
private void cleanupStaleEntries() {
WeakSourceKey sourceRef = null;
while ((sourceRef = (WeakSourceKey) deadSources.poll()) != null) {
sourceCache.remove(sourceRef);
}
}
private static final class WeakSourceKey extends WeakReference {
final Object key;
private final String[] arguments;
WeakSourceKey(Object key, Source value, String[] arguments, ReferenceQueue q) {
super(value, q);
this.key = key;
this.arguments = arguments != null && arguments.length == 0 ? null : arguments;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + key.hashCode();
result = prime * result + Arrays.hashCode(arguments);
return result;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof WeakSourceKey) {
WeakSourceKey other = (WeakSourceKey) obj;
return key.equals(other.key) && Arrays.equals(arguments, other.arguments);
} else {
return false;
}
}
}
}
