test/hotspot/jtreg/runtime/CDSCompressedKPtrs/XShareAuto.java

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/**
 * @test
 * @requires vm.cds
 * @bug 8005933
 * @summary -Xshare:auto is the default when -Xshare is not specified
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run main XShareAuto
 */

import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

public class XShareAuto {
    public static void main(String[] args) throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-server", "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedArchiveFile=./XShareAuto.jsa", "-Xshare:dump");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Loading classes to share");
        output.shouldHaveExitValue(0);


        // We have 2 test cases:
        String cases[] = {
            "-Xshare:auto",    // case [1]: -Xshare:auto is explicitly specified.
            "-showversion"     // case [2]: -Xshare:auto is not explicitly specified,
                               //           but VM should still use it by default.
        };

        for (String x : cases) {
            pb = ProcessTools.createJavaProcessBuilder(
                "-XX:+UnlockDiagnosticVMOptions",
                "-XX:SharedArchiveFile=./XShareAuto.jsa",
                "-Xlog:cds",
                x,
                "-version");
            output = new OutputAnalyzer(pb.start());
            String outputString = output.getOutput();

            if (!outputString.contains("Unable to map")) {
                // sharing may not be enabled if XShareAuto.jsa cannot be mapped due to
                // ASLR.
                output.shouldContain("sharing");
            }
            output.shouldHaveExitValue(0);
        }
    }
}