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path: root/test/compiler/escapeAnalysis/TestEscapeThroughInvoke.java
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/*
 * Copyright (c) 2015, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/**
 * @test
 * @bug 8073956
 * @summary Tests C2 EA with allocated object escaping through a call.
 * @run main/othervm -XX:CompileCommand=dontinline,TestEscapeThroughInvoke::create TestEscapeThroughInvoke
 */
public class TestEscapeThroughInvoke {
    private A a;

    public static void main(String[] args) {
        TestEscapeThroughInvoke test = new TestEscapeThroughInvoke();
        test.a = new A(42);
        // Make sure run gets compiled by C2
        for (int i = 0; i < 100_000; ++i) {
            test.run();
        }
    }

    private void run() {
        // Allocate something to trigger EA
        new Object();
        // Create a new escaping instance of A and
        // verify that it is always equal to 'a.saved'.
        A escapingA = create(42);
        a.check(escapingA);
    }

    // Create and return a new instance of A that escaped through 'A::saveInto'.
    // The 'dummy' parameters are needed to avoid EA skipping the methods.
    private A create(Integer dummy) {
        A result = new A(dummy);
        result.saveInto(a, dummy); // result escapes into 'a' here
        return result;
    }
}

class A {
    private A saved;

    public A(Integer dummy) { }

    public void saveInto(A other, Integer dummy) {
        other.saved = this;
    }

    public void check(A other) {
        if (this.saved != other) {
            throw new RuntimeException("TEST FAILED: Objects not equal.");
        }
    }
}