hotspot/test/runtime/lambda-features/CyclicInterfaceInit.java
author coleenp
Wed, 21 Sep 2016 09:56:18 -0400
changeset 41293 871b2f487dc0
permissions -rw-r--r--
8163969: Cyclic interface initialization causes JVM crash Summary: Fix interface initialization to follow spec: interface initializations do not set initialization state of interfaces that extend them. Reviewed-by: dholmes, acorn, lfoltan
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/*
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 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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/*
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 * @test
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 * @bug 8163969
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 * @summary Interface initialization was crashing on this because the wrong class was getting
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 * initialization error.
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 * @run main CyclicInterfaceInit
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 */
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/**
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 * This snippet crashes with
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 * - Java(TM) SE Runtime Environment (8.0_101-b13) (build 1.8.0_101-b13)
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 */
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public class CyclicInterfaceInit {
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    interface Base {
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        static final Object CONST = new Target(){}.someMethod();
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        default void important() {
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            // Super interfaces with default methods get initialized (JLS 12.4.1)
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        }
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    }
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   static boolean out(String c) {
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       System.out.println("initializing " + c);
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       return true;
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    }
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    interface Target extends Base {
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        boolean v = CyclicInterfaceInit.out("Target");
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        default Object someMethod() {
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            throw new RuntimeException();
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        }
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        // Target can be fully initialized before initializating Base because Target doesn't
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        // initiate the initialization of Base.
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    }
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    static class InnerBad implements Target {}
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    public static void main(String[] args) {
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        try {
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          new Target() {};  // Creates inner class that causes initialization of super interfaces
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        } catch (ExceptionInInitializerError e) {
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          System.out.println("ExceptionInInitializerError thrown as expected");
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        }
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        // Try again, InnerBad instantiation should throw NoClassdefFoundError
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        // because Base is marked erroneous due to previous exception during initialization
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        try {
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          InnerBad ig = new InnerBad();
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          throw new RuntimeException("FAILED- initialization of InnerBad should throw NCDFE");
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        } catch (NoClassDefFoundError e) {
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          System.out.println("NoClassDefFoundError thrown as expected");
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        }
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        // Target is already initialized.
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        System.out.println("Target.v is " + Target.v);
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        // shouldn't throw any exceptions.
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    }
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}