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