jdk-24/hotspot/test/runtime/SharedArchiveFile/CdsDifferentObjectAlignment.java

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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/sun.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);
    }
}