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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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 * 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
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
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 * (a) the Software, and
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package com.oracle.truffle.polyglot;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.ThreadLocalAction;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleSafepoint;
import com.oracle.truffle.api.frame.FrameInstance;
import com.oracle.truffle.api.frame.FrameInstanceVisitor;

final class PolyglotStackFramesRetriever {

    @SuppressWarnings("SynchronizationOnLocalVariableOrMethodParameter")
    static FrameInstance[][] getStackFrames(PolyglotContextImpl context) {
        Map> frameInstancesByThread = new ConcurrentHashMap<>();
        Thread[] threads;
        Future future;
        synchronized (context) {
            threads = context.getSeenThreads().keySet().toArray(new Thread[0]);
            if (!context.state.isClosed()) {
                future = context.threadLocalActions.submit(null, PolyglotEngineImpl.ENGINE_ID, new ThreadLocalAction(false, false) {
                    @Override
                    protected void perform(Access access) {
                        List frameInstances = new ArrayList<>();
                        Truffle.getRuntime().iterateFrames(new FrameInstanceVisitor