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/*

 * @test

 * @bug 8022865

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

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run main ObjectAlignment

 */

public class ObjectAlignment {

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

        if (Platform.is64bit()) {

            // Minimum alignment should be 8

            testObjectAlignment(4)

                .shouldContain("outside the allowed range")

                .shouldHaveExitValue(1);

            // Alignment has to be a power of 2

            testObjectAlignment(9)

                .shouldContain("must be power of 2")

                .shouldHaveExitValue(1);

            testObjectAlignment(-1)

                .shouldContain("outside the allowed range")

                .shouldHaveExitValue(1);

            // Maximum alignment allowed is 256

            testObjectAlignment(512)

                .shouldContain("outside the allowed range")

                .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());

    }

}