hotspot/test/runtime/SharedArchiveFile/CdsSameObjectAlignment.java

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/**
 * @test CdsSameObjectAlignment
 * @requires vm.cds
 * @summary Testing CDS (class data sharing) using varying object alignment.
 *          Using same object alignment for each dump/load pair
 * @requires (vm.opt.UseCompressedOops == null) | (vm.opt.UseCompressedOops == true)
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 */

import jdk.test.lib.Platform;
import jdk.test.lib.cds.CDSTestUtils;
import jdk.test.lib.process.OutputAnalyzer;

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);

        CDSTestUtils.createArchiveAndCheck(objectAlignmentArg);
        CDSTestUtils.runWithArchiveAndCheck(objectAlignmentArg);
    }
}