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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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/*
 * Copyright (c) 2020, 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.
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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
 * minimum a reference to the UPL must be included in all copies or substantial
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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<>() {
                            @Override
                            public Object visitFrame(FrameInstance frameInstance) {
                                return frameInstances.add(frameInstance);
                            }
                        });
                        frameInstancesByThread.put(access.getThread(), frameInstances);
                    }
                }, false);
            } else {
                future = CompletableFuture.completedFuture(null);
            }
        }

        TruffleSafepoint.setBlockedThreadInterruptible(context.uncachedLocation, new TruffleSafepoint.Interruptible>() {
            @Override
            public void apply(Future arg) throws InterruptedException {
                try {
                    arg.get();
                } catch (ExecutionException e) {
                    throw CompilerDirectives.shouldNotReachHere(e);
                }
            }
        }, future);

        FrameInstance[][] toRet = new FrameInstance[threads.length][];
        for (int i = 0; i < threads.length; i++) {
            Thread thread = threads[i];
            List frameInstances = frameInstancesByThread.get(thread);
            if (frameInstances != null) {
                toRet[i] = frameInstances.toArray(new FrameInstance[0]);
            } else {
                toRet[i] = new FrameInstance[0];
            }
        }

        return toRet;
    }
}