test/hotspot/jtreg/compiler/onSpinWait/TestOnSpinWaitNoneAArch64.java

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/**
 * @test TestOnSpinWaitNoneAArch64
 * @summary Checks that java.lang.Thread.onSpinWait is not intrinsified when '-XX:OnSpinWaitInst=none' is used
 * @bug 8186670
 * @library /test/lib
 *
 * @requires vm.flagless
 * @requires os.arch=="aarch64"
 *
 * @run driver compiler.onSpinWait.TestOnSpinWaitNoneAArch64
 */

package compiler.onSpinWait;

import java.util.ArrayList;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

public class TestOnSpinWaitNoneAArch64 {

    public static void main(String[] args) throws Exception {
        ArrayList<String> command = new ArrayList<String>();
        command.add("-XX:+IgnoreUnrecognizedVMOptions");
        command.add("-showversion");
        command.add("-XX:-TieredCompilation");
        command.add("-Xbatch");
        command.add("-XX:+PrintCompilation");
        command.add("-XX:+UnlockDiagnosticVMOptions");
        command.add("-XX:+PrintInlining");
        command.add("-XX:OnSpinWaitInst=none");
        command.add(Launcher.class.getName());

        // Test C2 compiler
        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(command);

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

        analyzer.shouldHaveExitValue(0);

        // The test is applicable only to C2 (present in Server VM).
        if (analyzer.getStderr().contains("Server VM")) {
            analyzer.shouldNotContain("java.lang.Thread::onSpinWait (1 bytes)   (intrinsic)");
        }
    }

    static class Launcher {

        public static void main(final String[] args) throws Exception {
            int end = 20_000;

            for (int i=0; i < end; i++) {
                test();
            }
        }
        static void test() {
            java.lang.Thread.onSpinWait();
        }
    }
}