ClassResolutionTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test ClassResolutionTest
 * @bug 8144874
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @run driver ClassResolutionTest
 */

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import java.lang.ref.WeakReference;
import java.lang.reflect.Method;

public class ClassResolutionTest {

    public static class ClassResolutionTestMain {

        public static class Thing1 {
            public static int getThingNumber() {
                return 1;
            }
        };
        public static class Thing1Handler {
            public static int getThingNumber() {
                return Thing1.getThingNumber();
            }
        };

        public static void main(String... args) throws Exception {
            int x = Thing1Handler.getThingNumber();
            System.out.println("ThingNumber: "+Integer.toString(x));
        }
    }

    public static void main(String... args) throws Exception {

        // (1) class+resolve should turn on.
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xlog:class+resolve=debug",
                                                                  ClassResolutionTestMain.class.getName());
        OutputAnalyzer o = new OutputAnalyzer(pb.start());
        o.shouldContain("[class,resolve] ClassResolutionTest$ClassResolutionTestMain$Thing1Handler ClassResolutionTest$ClassResolutionTestMain$Thing1");
        o.shouldContain("[class,resolve] resolve JVM_CONSTANT_MethodHandle");

        // (2) class+resolve should turn off.
        pb = ProcessTools.createJavaProcessBuilder("-Xlog:class+resolve=debug",
                                                   "-Xlog:class+resolve=off",
                                                   ClassResolutionTestMain.class.getName());
        o = new OutputAnalyzer(pb.start());
        o.shouldNotContain("[class,resolve]");

        // (3) TraceClassResolution should turn on.
        pb = ProcessTools.createJavaProcessBuilder("-XX:+TraceClassResolution",
                                                   ClassResolutionTestMain.class.getName());
        o = new OutputAnalyzer(pb.start());
        o.shouldContain("[class,resolve] ClassResolutionTest$ClassResolutionTestMain$Thing1Handler ClassResolutionTest$ClassResolutionTestMain$Thing1");

        // (4) TraceClassResolution should turn off.
        pb = ProcessTools.createJavaProcessBuilder("-Xlog:class+resolve=debug",
                                                   "-XX:-TraceClassResolution",
                                                   ClassResolutionTestMain.class.getName());
        o = new OutputAnalyzer(pb.start());
        o.shouldNotContain("[class,resolve]");

    };

}