test/jdk/jdk/jfr/event/runtime/TestClassLoaderStatsEvent.java

rev 58565 : 8238358: Implementation of JEP 371: Hidden Classes
Reviewed-by: duke
Contributed-by: mandy.chung@oracle.com, lois.foltan@oracle.com, david.holmes@oracle.com, harold.seigel@oracle.com, serguei.spitsyn@oracle.com, alex.buckley@oracle.com, jamsheed.c.m@oracle.com
rev 58568 : [mq]: hidden-class-4

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -26,10 +26,11 @@
 package jdk.jfr.event.runtime;
 
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.lang.reflect.Method;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 import java.util.List;
 
 import jdk.jfr.Recording;

@@ -37,15 +38,20 @@
 import jdk.jfr.consumer.RecordedEvent;
 import jdk.test.lib.Asserts;
 import jdk.test.lib.jfr.EventNames;
 import jdk.test.lib.jfr.Events;
 
+import jdk.test.lib.compiler.InMemoryJavaCompiler;
+
 /**
  * @test
  * @key jfr
  * @requires vm.hasJFR
  * @library /test/lib /test/jdk
+ * @modules java.base/jdk.internal.misc
+ *          jdk.compiler
+ *          jdk.jfr
  * @build jdk.jfr.event.runtime.TestClasses
  * @run main/othervm jdk.jfr.event.runtime.TestClassLoaderStatsEvent
  */
 public class TestClassLoaderStatsEvent {
     private final static String EVENT_NAME = EventNames.ClassLoaderStatistics;

@@ -71,16 +77,19 @@
             }
             RecordedClassLoader recordedClassLoader = event.getValue("classLoader");
             if (CLASSLOADER_TYPE_NAME.equals(recordedClassLoader.getType().getName())) {
                 Asserts.assertEquals(CLASS_LOADER_NAME, recordedClassLoader.getName(),
                     "Expected class loader name " + CLASS_LOADER_NAME + ", got name " + recordedClassLoader.getName());
-                Events.assertField(event, "classCount").equal(1L);
+                Events.assertField(event, "classCount").equal(2L);
                 Events.assertField(event, "chunkSize").above(1L);
                 Events.assertField(event, "blockSize").above(1L);
-                Events.assertField(event, "unsafeAnonymousClassCount").equal(1L);
-                Events.assertField(event, "unsafeAnonymousChunkSize").above(1L);
-                Events.assertField(event, "unsafeAnonymousBlockSize").above(1L);
+                Events.assertField(event, "unsafeAnonymousClassCount").equal(2L);
+                Events.assertField(event, "unsafeAnonymousChunkSize").above(0L);
+                Events.assertField(event, "unsafeAnonymousBlockSize").above(0L);
+                Events.assertField(event, "hiddenClassCount").equal(2L);
+                Events.assertField(event, "hiddenChunkSize").above(0L);
+                Events.assertField(event, "hiddenBlockSize").above(0L);
                 isAnyFound = true;
             }
         }
         Asserts.assertTrue(isAnyFound, "No events found");
     }

@@ -89,10 +98,22 @@
         dummyloader = new DummyClassLoader(name);
         Class<?> c = Class.forName(TestClass.class.getName(), true, dummyloader);
         if (c.getClassLoader() != dummyloader) {
             throw new RuntimeException("TestClass defined by wrong classloader: " + c.getClassLoader());
         }
+
+        // Compile a class for method createNonFindableClasses() to use to create both a
+        // weak hidden class and an anonymous class.
+        byte klassbuf[] = InMemoryJavaCompiler.compile("jdk.jfr.event.runtime.TestClass",
+            "package jdk.jfr.event.runtime; " +
+            "public class TestClass { " +
+            "    public static void concat(String one, String two) throws Throwable { " +
+            " } } ");
+
+        Method m = c.getDeclaredMethod("createNonFindableClasses", byte[].class);
+        m.setAccessible(true);
+        m.invoke(null, klassbuf);
     }
 
     public static class DummyClassLoader extends ClassLoader {
 
         static ByteBuffer readClassFile(String name) {