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/*

 * @test CdsSameObjectAlignment

 * @summary Testing CDS (class data sharing) using varying object alignment.

 *          Using same object alignment for each dump/load pair

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

 *          java.management

 */

public class CdsSameObjectAlignment {

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

        String nativeWordSize = System.getProperty("sun.arch.data.model");

        if (!Platform.is64bit()) {

            System.out.println("ObjectAlignmentInBytes for CDS is only " +

                "supported on 64bit platforms; this plaform is " +

                nativeWordSize);

            System.out.println("Skipping the test");

        } else {

            dumpAndLoadSharedArchive(8);

            dumpAndLoadSharedArchive(16);

            dumpAndLoadSharedArchive(32);

            dumpAndLoadSharedArchive(64);

        }

    }

    private static void

    dumpAndLoadSharedArchive(int objectAlignmentInBytes) throws Exception {

        String objectAlignmentArg = "-XX:ObjectAlignmentInBytes="

            + objectAlignmentInBytes;

        System.out.println("dumpAndLoadSharedArchive(): objectAlignmentInBytes = "

            + objectAlignmentInBytes);

        String filename = "./CdsSameObjectAlignment" + objectAlignmentInBytes + ".jsa";

        // create shared archive

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

            "-XX:+UnlockDiagnosticVMOptions",

            "-XX:SharedArchiveFile=" + filename,

            "-Xshare:dump",

            objectAlignmentArg);

        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        output.shouldContain("Loading classes to share");

        output.shouldHaveExitValue(0);

        // run using the shared archive

        pb = ProcessTools.createJavaProcessBuilder(

            "-XX:+UnlockDiagnosticVMOptions",

            "-XX:SharedArchiveFile=" + filename,

            "-Xshare:on",

            objectAlignmentArg,

            "-version");

        output = new OutputAnalyzer(pb.start());

        try {

            output.shouldContain("sharing");

            output.shouldHaveExitValue(0);

        } catch (RuntimeException e) {

            // CDS uses absolute addresses for performance.

            // It will try to reserve memory at a specific address;

            // there is a chance such reservation will fail

            // If it does, it is NOT considered a failure of the feature,

            // rather a possible expected outcome, though not likely

            output.shouldContain("Unable to use shared archive");

            output.shouldHaveExitValue(1);

        }

    }

}