/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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());
    }
}