/*

 * Copyright (c) 2014, 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.

 *

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 */

/*

 * @test

 * @bug 8022865

 * @summary Tests for the -XX:ObjectAlignmentInBytes command line option

 * @library /testlibrary

 * @run main ObjectAlignment

 */

import com.oracle.java.testlibrary.*;

public class ObjectAlignment {

    public static void main(String[] args) throws Exception {

        if (Platform.is64bit()) {

            // Minimum alignment should be 8

            testObjectAlignment(4)

                .shouldContain("error: ObjectAlignmentInBytes=4 must be greater or equal 8")

                .shouldHaveExitValue(1);

            // Alignment has to be a power of 2

            testObjectAlignment(9)

                .shouldContain("error: ObjectAlignmentInBytes=9 must be power of 2")

                .shouldHaveExitValue(1);

            testObjectAlignment(-1)

                .shouldContain("error: ObjectAlignmentInBytes=-1 must be power of 2")

                .shouldHaveExitValue(1);

            // Maximum alignment allowed is 256

            testObjectAlignment(512)

                .shouldContain("error: ObjectAlignmentInBytes=512 must not be greater than 256")

                .shouldHaveExitValue(1);

            // Valid alignments should work

            testObjectAlignment(8).shouldHaveExitValue(0);

            testObjectAlignment(16).shouldHaveExitValue(0);

            testObjectAlignment(256).shouldHaveExitValue(0);

        } else {

            // For a 32bit JVM the option isn't there, make sure it's not silently ignored

            testObjectAlignment(8)

                .shouldContain("Unrecognized VM option 'ObjectAlignmentInBytes=8'")

                .shouldHaveExitValue(1);

        }

    }

    private static OutputAnalyzer testObjectAlignment(int alignment) throws Exception {

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:ObjectAlignmentInBytes=" + alignment,

                                                                  "-version");

        return new OutputAnalyzer(pb.start());

    }

}