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/*
* Copyright (c) 2017, 2020, 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
*
* 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
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* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
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* (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
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
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* This license is subject to the following condition:
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* The above copyright notice and either this complete permission notice or at a
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package com.oracle.truffle.polyglot;
import static com.oracle.truffle.polyglot.EngineAccessor.LANGUAGE;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.Arrays;
import java.util.Collection;
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 Cache strongCache;
private final Cache weakCache;
PolyglotSourceCache() {
this.weakCache = new WeakCache();
this.strongCache = new StrongCache();
}
CallTarget parseCached(PolyglotLanguageContext context, Source source, String[] argumentNames) {
CallTarget target;
if (source.isCached()) {
Cache strong = this.strongCache;
boolean useStrong = context.getEngine().storeEngine;
if (useStrong || !strong.isEmpty()) {
target = strong.lookup(context, source, argumentNames, useStrong);
if (target != null) {
// target found in strong cache
return target;
} else {
// fallback to weak cache.
}
}
target = weakCache.lookup(context, source, argumentNames, true);
} else {
target = parseImpl(context, argumentNames, source);
}
return target;
}
void listCachedSources(PolyglotLanguageInstance language, Collection source) {
strongCache.listSources(language, source);
weakCache.listSources(language, source);
}
private static CallTarget parseImpl(PolyglotLanguageContext context, String[] argumentNames, Source 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) {
if (!source.hasBytes() && !source.hasCharacters()) {
throw PolyglotEngineException.illegalArgument(String.format("Error evaluating the source. The source does not specify characters nor bytes."));
}
String mimeType = source.getMimeType();
Set mimeTypes = context.language.cache.getMimeTypes();
if (mimeType != null && !mimeTypes.contains(mimeType)) {
throw PolyglotEngineException.illegalArgument(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 PolyglotEngineException.illegalArgument(
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 PolyglotEngineException.illegalArgument(
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 PolyglotEngineException.illegalArgument(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 PolyglotEngineException.illegalArgument(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 PolyglotEngineException.illegalArgument(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 PolyglotEngineException.illegalArgument(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 abstract static class Cache {
abstract boolean isEmpty();
abstract CallTarget lookup(PolyglotLanguageContext context, Source source, String[] argumentNames, boolean parse);
abstract void listSources(PolyglotLanguageInstance language, Collection source);
}
private static final class StrongCache extends Cache {
private final ConcurrentHashMap sourceCache = new ConcurrentHashMap<>();
@Override
CallTarget lookup(PolyglotLanguageContext context, Source source, String[] argumentNames, boolean parse) {
SourceKey key = new SourceKey(source, argumentNames);
CallTarget target = sourceCache.get(key);
if (target == null && parse) {
target = parseImpl(context, argumentNames, source);
CallTarget prevTarget = sourceCache.putIfAbsent(key, target);
if (prevTarget != null) {
target = prevTarget;
}
}
return target;
}
@Override
boolean isEmpty() {
return sourceCache.isEmpty();
}
@Override
void listSources(PolyglotLanguageInstance language, Collection sources) {
PolyglotImpl polygot = language.getImpl();
for (SourceKey key : sourceCache.keySet()) {
sources.add(PolyglotImpl.getOrCreatePolyglotSource(polygot, (Source) key.key));
}
}
}
private static final class WeakCache extends Cache {
private final ConcurrentHashMap sourceCache = new ConcurrentHashMap<>();
private final ReferenceQueue deadSources = new ReferenceQueue<>();
@Override
CallTarget lookup(PolyglotLanguageContext context, Source source, String[] argumentNames, boolean parse) {
cleanupStaleEntries();
Object sourceId = EngineAccessor.SOURCE.getSourceIdentifier(source);
Source sourceValue = EngineAccessor.SOURCE.copySource(source);
WeakSourceKey ref = new WeakSourceKey(new SourceKey(sourceId, argumentNames), source, deadSources);
WeakCacheValue value = sourceCache.get(ref);
if (value == null) {
if (parse) {
value = new WeakCacheValue(parseImpl(context, argumentNames, sourceValue), sourceValue);
WeakCacheValue prev = sourceCache.putIfAbsent(ref, value);
if (prev != null) {
/*
* Parsed twice -> discard the one not in the cache.
*/
value = prev;
}
} else {
return null;
}
}
return value.target;
}
@Override
boolean isEmpty() {
return sourceCache.isEmpty();
}
@Override
void listSources(PolyglotLanguageInstance language, Collection sources) {
cleanupStaleEntries();
PolyglotImpl polygot = language.getImpl();
for (WeakCacheValue value : sourceCache.values()) {
sources.add(PolyglotImpl.getOrCreatePolyglotSource(polygot, value.source));
}
}
private void cleanupStaleEntries() {
WeakSourceKey sourceRef = null;
while ((sourceRef = (WeakSourceKey) deadSources.poll()) != null) {
sourceCache.remove(sourceRef);
}
}
}
static class WeakCacheValue {
final CallTarget target;
final Source source;
WeakCacheValue(CallTarget target, Source source) {
this.target = target;
this.source = source;
}
}
private static final class SourceKey {
private final Object key;
private final String[] arguments;
SourceKey(Object key, String[] arguments) {
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 SourceKey) {
SourceKey other = (SourceKey) obj;
return key.equals(other.key) && Arrays.equals(arguments, other.arguments);
} else {
return false;
}
}
}
private static final class WeakSourceKey extends WeakReference {
final SourceKey key;
WeakSourceKey(SourceKey key, Source value, ReferenceQueue q) {
super(value, q);
this.key = key;
}
@Override
public int hashCode() {
return key.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof WeakSourceKey) {
WeakSourceKey other = (WeakSourceKey) obj;
return key.equals(other.key);
} else {
return false;
}
}
}
}
