test/hotspot/jtreg/runtime/SharedArchiveFile/SharedStrings.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/**
 * @test
 * @summary Check to make sure that shared strings in the bootstrap CDS archive
 *          are actually shared
 * @requires vm.cds.archived.java.heap
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @build SharedStringsWb sun.hotspot.WhiteBox
 * @run driver ClassFileInstaller -jar whitebox.jar sun.hotspot.WhiteBox
 * @run main SharedStrings
 */

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

public class SharedStrings {
    public static void main(String[] args) throws Exception {
        // Note: This is a basic sanity test for Shared Strings feature.
        // This also serves as a reference on how to use this feature,
        // hence the command lines are spelled out instead of using the
        // test utils methods.
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedArchiveFile=./SharedStrings.jsa",
            "-Xlog:cds,cds+hashtables",
            // Needed for bootclasspath match, for CDS to work with WhiteBox API
            "-Xbootclasspath/a:" + ClassFileInstaller.getJarPath("whitebox.jar"),
            "-Xshare:dump");

        OutputAnalyzer out = CDSTestUtils.executeAndLog(pb, "dump");
        CDSTestUtils.checkDump(out, "Shared string table stats");


        pb = ProcessTools.createJavaProcessBuilder(
                "-XX:+UnlockDiagnosticVMOptions",
                "-XX:SharedArchiveFile=./SharedStrings.jsa",
                // needed for access to white box test API
                "-Xbootclasspath/a:" + ClassFileInstaller.getJarPath("whitebox.jar"),
                "-XX:+UnlockDiagnosticVMOptions", "-XX:+WhiteBoxAPI",
                "-Xshare:on", "-showversion", "SharedStringsWb");

        out = CDSTestUtils.executeAndLog(pb, "exec");
        CDSTestUtils.checkExec(out);
    }
}