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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.

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/*
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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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package com.oracle.truffle.polyglot;

import static com.oracle.truffle.polyglot.EngineAccessor.LANGUAGE;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;

import org.graalvm.collections.Pair;
import org.graalvm.polyglot.Source;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.TruffleLanguage.ContextPolicy;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.polyglot.PolyglotImpl.VMObject;
import com.oracle.truffle.polyglot.PolyglotLocals.LanguageContextLocal;
import com.oracle.truffle.polyglot.PolyglotLocals.LanguageContextThreadLocal;
import com.oracle.truffle.polyglot.PolyglotLocals.LocalLocation;

final class PolyglotLanguageInstance implements VMObject {

    final PolyglotLanguage language;
    final TruffleLanguage spi;

    private final PolyglotSourceCache sourceCache;
    private final Map, PolyglotValueDispatch> valueCache;
    private final Map, CallTarget> callTargetCache;

    final Map hostToGuestCodeCache = new ConcurrentHashMap<>();
    private volatile OptionValuesImpl firstOptionValues;
    private volatile boolean multiContextInitialized;
    final Map, ClassLoader> staticObjectClassLoaders = new ConcurrentHashMap<>();
    final ConcurrentHashMap, Class>, Object> generatorCache = new ConcurrentHashMap<>();

    final WeakAssumedValue singleLanguageContext = new WeakAssumedValue<>("single language context");
    // effectively final
    List> contextLocals;
    List> contextThreadLocals;
    LocalLocation[] contextLocalLocations;
    LocalLocation[] contextThreadLocalLocations;
    int claimedCount;

    @SuppressWarnings("unchecked")
    PolyglotLanguageInstance(PolyglotLanguage language) {
        this.language = language;
        this.sourceCache = new PolyglotSourceCache();
        this.valueCache = new ConcurrentHashMap<>();
        this.callTargetCache = new ConcurrentHashMap<>();
        try {
            this.spi = (TruffleLanguage) language.cache.loadLanguage();
            LANGUAGE.initializeLanguage(spi, language.info, language, this);
        } catch (Exception e) {
            throw new IllegalStateException(String.format("Error initializing language '%s' using class '%s'.", language.cache.getId(), language.cache.getClassName()), e);
        }
        PolyglotValueDispatch.createDefaultValues(getImpl(), this, this.valueCache);
    }

    CallTarget lookupCallTarget(Class rootNodeClass) {
        return callTargetCache.get(rootNodeClass);
    }

    CallTarget installCallTarget(RootNode rootNode) {
        return callTargetCache.computeIfAbsent(rootNode.getClass(), (r) -> Truffle.getRuntime().createCallTarget(rootNode));
    }

    public PolyglotEngineImpl getEngine() {
        return language.engine;
    }

    boolean areOptionsCompatible(OptionValuesImpl newOptionValues) {
        OptionValuesImpl firstOptions = this.firstOptionValues;
        if (firstOptionValues == null) {
            return true;
        } else {
            return EngineAccessor.LANGUAGE.areOptionsCompatible(spi, firstOptions, newOptionValues);
        }
    }

    void claim(OptionValuesImpl optionValues) {
        assert Thread.holdsLock(language.engine.lock);
        if (this.firstOptionValues == null) {
            this.firstOptionValues = optionValues;
        }
        claimedCount++;
    }

    void patchFirstOptions(OptionValuesImpl optionValues) {
        this.firstOptionValues = optionValues;
    }

    void ensureMultiContextInitialized() {
        assert Thread.holdsLock(language.engine.lock);
        if (!language.engine.singleContext.isValid() && language.cache.getPolicy() != ContextPolicy.EXCLUSIVE) {
            if (!multiContextInitialized) {
                multiContextInitialized = true;
                language.engine.initializeMultiContext();
                this.singleLanguageContext.invalidate();
                LANGUAGE.initializeMultiContext(spi);
            }
        }
    }

    PolyglotSourceCache getSourceCache() {
        return sourceCache;
    }

    void listCachedSources(Collection sources) {
        sourceCache.listCachedSources(this, sources);
    }

    PolyglotValueDispatch lookupValueCache(PolyglotContextImpl context, Object guestValue) {
        PolyglotValueDispatch cache = valueCache.get(guestValue.getClass());
        if (cache == null) {
            Object prev = language.engine.enterIfNeeded(context, true);
            try {
                cache = lookupValueCacheImpl(guestValue);
            } finally {
                language.engine.leaveIfNeeded(prev, context);
            }
        }
        return cache;
    }

    private synchronized PolyglotValueDispatch lookupValueCacheImpl(Object guestValue) {
        PolyglotValueDispatch cache = valueCache.computeIfAbsent(guestValue.getClass(), new Function, PolyglotValueDispatch>() {
            public PolyglotValueDispatch apply(Class t) {
                return PolyglotValueDispatch.createInteropValue(PolyglotLanguageInstance.this, (TruffleObject) guestValue, guestValue.getClass());
            }
        });
        return cache;
    }

}
    

    

    

            

    

            



    
    






    
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