jdk-24/test/hotspot/jtreg/runtime/SharedArchiveFile/SharedStringsDedup.java

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/**
 * @test SharedStringsDedup
 * @requires vm.cds
 * @summary Test -Xshare:auto with shared strings and -XX:+UseStringDeduplication
 * Feature support: G1GC only, compressed oops/kptrs, 64-bit os, not on windows
 * @requires (sun.arch.data.model != "32") & (os.family != "windows")
 * @requires vm.cds
 * @requires vm.gc.G1
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run main SharedStringsDedup
 */

import jdk.test.lib.cds.CDSTestUtils;
import jdk.test.lib.process.OutputAnalyzer;
import java.io.File;

// The main purpose is to test the interaction between shared strings
// and -XX:+UseStringDeduplication. We run in -Xshare:auto mode so
// we don't need to worry about CDS archive mapping failure (which
// doesn't happen often so it won't impact coverage).
public class SharedStringsDedup {
    public static void main(String[] args) throws Exception {
        OutputAnalyzer out =
            CDSTestUtils.createArchive("-XX:+UseCompressedOops", "-XX:+UseG1GC");
        CDSTestUtils.checkDump(out, "Shared string table stats");
        CDSTestUtils.runWithArchiveAndCheck("-XX:+UseCompressedOops", "-XX:+UseG1GC",
                                            "-XX:+UseStringDeduplication");
    }
}