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 *

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 *

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/*

 * @test CdsDifferentObjectAlignment

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

 *          Using different object alignment for each dump/load pair.

 *          This is a negative test; using  object alignment for loading that

 *          is different from object alignment for creating a CDS file

 *          should fail when loading.

 * @library /testlibrary

 * @bug 8025642

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

 *          java.management

 */

import jdk.test.lib.*;

public class CdsDifferentObjectAlignment {

    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 {

            createAndLoadSharedArchive(16, 64);

            createAndLoadSharedArchive(64, 32);

        }

    }

    // Parameters are object alignment expressed in bytes

    private static void

    createAndLoadSharedArchive(int createAlignment, int loadAlignment)

    throws Exception {

        String createAlignmentArgument = "-XX:ObjectAlignmentInBytes=" +

            createAlignment;

        String loadAlignmentArgument = "-XX:ObjectAlignmentInBytes=" +

            loadAlignment;

        String filename = "./CdsDifferentObjectAlignment" + createAlignment + ".jsa";

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

            "-XX:+UnlockDiagnosticVMOptions",

            "-XX:SharedArchiveFile=" + filename,

            "-Xshare:dump",

            createAlignmentArgument);

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

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

        output.shouldHaveExitValue(0);

        pb = ProcessTools.createJavaProcessBuilder(

            "-XX:+UnlockDiagnosticVMOptions",

            "-XX:SharedArchiveFile=" + filename,

            "-Xshare:on",

            loadAlignmentArgument,

            "-version");

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

        String expectedErrorMsg =

            String.format(

            "The shared archive file's ObjectAlignmentInBytes of %d " +

            "does not equal the current ObjectAlignmentInBytes of %d",

            createAlignment,

            loadAlignment);

        try {

            output.shouldContain(expectedErrorMsg);

        } catch (RuntimeException e) {

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

        }

        output.shouldHaveExitValue(1);

    }

}