1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 /*
  26  * @test ClassResolutionTest
  27  * @bug 8144874
  28  * @modules java.base/jdk.internal.misc
  29  * @library /testlibrary
  30  * @build jdk.test.lib.OutputAnalyzer jdk.test.lib.ProcessTools
  31  * @run driver ClassResolutionTest
  32  */
  33 
  34 import jdk.test.lib.OutputAnalyzer;
  35 import jdk.test.lib.ProcessTools;
  36 import java.lang.ref.WeakReference;
  37 import java.lang.reflect.Method;
  38 
  39 public class ClassResolutionTest {
  40 
  41     public static class ClassResolutionTestMain {
  42 
  43         public static class Thing1 {
  44             public static int getThingNumber() {
  45                 return 1;
  46             }
  47         };
  48         public static class Thing1Handler {
  49             public static int getThingNumber() {
  50                 return Thing1.getThingNumber();
  51             }
  52         };
  53 
  54         public static void main(String... args) throws Exception {
  55             int x = Thing1Handler.getThingNumber();
  56             System.out.println("ThingNumber: "+Integer.toString(x));
  57         }
  58     }
  59 
  60     public static void main(String... args) throws Exception {
  61 
  62         // (1) class+resolve should turn on.
  63         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xlog:class+resolve=debug",
  64                                                                   ClassResolutionTestMain.class.getName());
  65         OutputAnalyzer o = new OutputAnalyzer(pb.start());
  66         o.shouldContain("[class,resolve] ClassResolutionTest$ClassResolutionTestMain$Thing1Handler ClassResolutionTest$ClassResolutionTestMain$Thing1");
  67         o.shouldContain("[class,resolve] resolve JVM_CONSTANT_MethodHandle");
  68 
  69         // (2) class+resolve should turn off.
  70         pb = ProcessTools.createJavaProcessBuilder("-Xlog:class+resolve=debug",
  71                                                    "-Xlog:class+resolve=off",
  72                                                    ClassResolutionTestMain.class.getName());
  73         o = new OutputAnalyzer(pb.start());
  74         o.shouldNotContain("[class,resolve]");
  75 
  76         // (3) TraceClassResolution should turn on.
  77         pb = ProcessTools.createJavaProcessBuilder("-XX:+TraceClassResolution",
  78                                                    ClassResolutionTestMain.class.getName());
  79         o = new OutputAnalyzer(pb.start());
  80         o.shouldContain("[class,resolve] ClassResolutionTest$ClassResolutionTestMain$Thing1Handler ClassResolutionTest$ClassResolutionTestMain$Thing1");
  81 
  82         // (4) TraceClassResolution should turn off.
  83         pb = ProcessTools.createJavaProcessBuilder("-Xlog:class+resolve=debug",
  84                                                    "-XX:-TraceClassResolution",
  85                                                    ClassResolutionTestMain.class.getName());
  86         o = new OutputAnalyzer(pb.start());
  87         o.shouldNotContain("[class,resolve]");
  88 
  89     };
  90 
  91 }