1 /*
 2  * Copyright (c) 2021, 2022, 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  * @test
26  * @compile lookup/Lookup.java
27  * @compile invoker/Invoker.java
28  * @run main/othervm --enable-native-access=ALL-UNNAMED TestLoaderLookup
29  */
30 
31 import java.lang.foreign.*;
32 import java.lang.reflect.*;
33 import java.net.MalformedURLException;
34 import java.net.URL;
35 import java.net.URLClassLoader;
36 import java.nio.file.Paths;
37 
38 public class TestLoaderLookup {
39     public static void main(String[] args) throws ReflectiveOperationException {
40         ClassLoader loader1 = newClassLoader("lookup");
41         Class<?> lookup = loader1.loadClass("lookup.Lookup");
42         Method fooSymbol = lookup.getDeclaredMethod("fooSymbol");
43         MemorySegment foo = (MemorySegment) fooSymbol.invoke(null);
44 
45         ClassLoader loader2 = newClassLoader("invoker");
46         Class<?> invoker = loader2.loadClass("invoker.Invoker");
47         Method invoke = invoker.getDeclaredMethod("invoke", MemorySegment.class);
48         invoke.invoke(null, foo);
49 
50         loader1 = null;
51         lookup = null;
52         fooSymbol = null;
53         // Make sure that the loader is kept reachable
54         for (int i = 0 ; i < 1000 ; i++) {
55             invoke.invoke(null, foo); // might crash if loader1 is GC'ed
56             System.gc();
57         }
58     }
59 
60     public static ClassLoader newClassLoader(String path) {
61         try {
62             return new URLClassLoader(new URL[] {
63                     Paths.get(System.getProperty("test.classes", path)).toUri().toURL(),
64             }, null);
65         } catch (MalformedURLException e){
66             throw new RuntimeException("Unexpected URL conversion failure", e);
67         }
68     }
69 }