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  * @enablePreview
27  * @requires jdk.foreign.linker != "UNSUPPORTED"
28  * @library ../
29  * @run testng/othervm
30  *   --enable-native-access=ALL-UNNAMED
31  *   TestVirtualCalls
32  */
33 
34 import java.lang.foreign.Linker;
35 import java.lang.foreign.FunctionDescriptor;
36 
37 import java.lang.foreign.MemorySegment;
38 import java.lang.invoke.MethodHandle;
39 
40 import org.testng.annotations.*;
41 
42 import static org.testng.Assert.assertEquals;
43 
44 public class TestVirtualCalls extends NativeTestHelper {
45 
46     static final Linker abi = Linker.nativeLinker();
47 
48     static final MethodHandle func;
49     static final MemorySegment funcA;
50     static final MemorySegment funcB;
51     static final MemorySegment funcC;
52 
53     static {
54         func = abi.downcallHandle(
55                 FunctionDescriptor.of(C_INT));
56 
57         System.loadLibrary("Virtual");
58         funcA = findNativeOrThrow("funcA");
59         funcB = findNativeOrThrow("funcB");
60         funcC = findNativeOrThrow("funcC");
61     }
62 
63     @Test
64     public void testVirtualCalls() throws Throwable {
65         assertEquals((int) func.invokeExact(funcA), 1);
66         assertEquals((int) func.invokeExact(funcB), 2);
67         assertEquals((int) func.invokeExact(funcC), 3);
68     }
69 
70     @Test(expectedExceptions = NullPointerException.class)
71     public void testNullTarget() throws Throwable {
72         int x = (int) func.invokeExact((MemorySegment)null);
73     }
74 
75 }