JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.graalvm.compiler.jtt.optimize;

import org.graalvm.compiler.jtt.JTTTest;
import org.graalvm.compiler.nodes.LogicNode;
import org.graalvm.compiler.nodes.java.InstanceOfNode;
import org.junit.Test;

/**
 * A few tests of expected simplifications by {@link InstanceOfNode#implies(boolean, LogicNode)}.
 */
public class InstanceOf extends JTTTest {

    static class A {
    }

    static class B extends A {
    }

    static class C extends B {
    }

    public boolean testSnippet1(Object o) {
        if (o instanceof B) {
            if (o instanceof A) {
                return true;
            }
        }
        return false;
    }

    public boolean testSnippet2(Object o) {
        if (o instanceof A) {
            return true;
        } else {
            return o instanceof B;
        }
    }

    @Test
    public void test1() {
        runTest("testSnippet1", new A());
        runTest("testSnippet1", new B());

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