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/*
 * Copyright (c) 2021, 2023, 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
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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
 * is contributed by such licensors),
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 * 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
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package com.oracle.graal.python.runtime.exception;

/**
 * This exception kills a Python thread.

 * It does intentionally not extends from {@link PythonControlFlowException} because if this
 * exception is thrown, we MUST NOT run any finally blocks. This is because we did probably
 * fail to acquire the GIL during context shutdown and thus we do not own the GIL when this
 * exception is flying.
 */
public final class PythonThreadKillException extends RuntimeException {

    private static final long serialVersionUID = 5323687983726237118L;
    public static final PythonThreadKillException INSTANCE = new PythonThreadKillException();

    /**
     * Creates an exception thrown to model control flow.
     *
     * @since 0.8 or earlier
     */
    public PythonThreadKillException() {
        /*
         * We use the super constructor that initializes the cause to null. Without that, the cause
         * would be this exception itself. This helps escape analysis: it avoids the circle of an
         * object pointing to itself. We also do not need a message, so we use the constructor that
         * also allows us to set the message to null.
         */
        super(null, null);
    }

    /**
     * For performance reasons, this exception does not record any stack trace information.
     *
     * @since 0.8 or earlier
     */
    @SuppressWarnings("sync-override")
    @Override
    public final Throwable fillInStackTrace() {
        return this;
    }
}