74 lines
2.7 KiB
Java
74 lines
2.7 KiB
Java
/*
|
|
* Copyright (c) 2020, 2021, 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.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* 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).
|
|
*
|
|
* 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.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
/*
|
|
* @test
|
|
* @summary Test that hidden classes get garbage collected.
|
|
* @library /test/lib
|
|
* @modules jdk.compiler
|
|
* @run main GCHiddenClass
|
|
*/
|
|
|
|
|
|
import java.lang.invoke.MethodType;
|
|
import java.lang.invoke.MethodHandles;
|
|
import java.lang.invoke.MethodHandles.Lookup;
|
|
import java.lang.ref.PhantomReference;
|
|
import java.lang.ref.Reference;
|
|
import java.lang.ref.ReferenceQueue;
|
|
|
|
import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
|
|
import jdk.test.lib.compiler.InMemoryJavaCompiler;
|
|
|
|
public class GCHiddenClass {
|
|
|
|
static byte klassbuf[] = InMemoryJavaCompiler.compile("TestClass",
|
|
"public class TestClass { " +
|
|
" public TestClass() { " +
|
|
" System.out.println(\"Hello\"); " +
|
|
" } } ");
|
|
|
|
// A private method is great to keep hidden Class reference local to make it
|
|
// GCed on the next cycle
|
|
private PhantomReference<Class<?>> createClass(ReferenceQueue<Class<?>> refQueue) throws Exception {
|
|
Lookup lookup = MethodHandles.lookup();
|
|
Class<?> cl = lookup.defineHiddenClass(klassbuf, false, NESTMATE).lookupClass();
|
|
return new PhantomReference<Class<?>>(cl, refQueue);
|
|
}
|
|
|
|
public boolean run() throws Exception {
|
|
ReferenceQueue<Class<?>> refQueue = new ReferenceQueue<Class<?>>();
|
|
PhantomReference<Class<?>> hiddenClassRef = createClass(refQueue);
|
|
System.gc();
|
|
Reference<? extends Class<?>> deletedObject = refQueue.remove();
|
|
return hiddenClassRef.equals(deletedObject);
|
|
}
|
|
|
|
public static void main(String[] args) throws Throwable {
|
|
GCHiddenClass gcHC = new GCHiddenClass();
|
|
if (!gcHC.run()) {
|
|
throw new RuntimeException("Test failed");
|
|
}
|
|
}
|
|
}
|