1 /*
 2  * Copyright (c) 2021, 2023, 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  * @run testng/othervm
27  *     --enable-native-access=ALL-UNNAMED
28  *     TestNULLAddress
29  */
30 
31 import org.testng.annotations.Test;
32 
33 import java.lang.foreign.Linker;
34 import java.lang.foreign.FunctionDescriptor;
35 import java.lang.foreign.MemorySegment;
36 import java.lang.foreign.SymbolLookup;
37 import java.lang.foreign.ValueLayout;
38 import java.lang.invoke.MethodHandle;
39 
40 import static org.testng.Assert.*;
41 
42 public class TestNULLAddress {
43 
44     static {
45         System.loadLibrary("Null");
46     }
47 
48     static final Linker LINKER = Linker.nativeLinker();
49 
50     @Test(expectedExceptions = IllegalArgumentException.class)
51     public void testNULLLinking() {
52         LINKER.downcallHandle(
53                 MemorySegment.NULL,
54                 FunctionDescriptor.ofVoid());
55     }
56 
57     @Test(expectedExceptions = IllegalArgumentException.class)
58     public void testNULLVirtual() throws Throwable {
59         MethodHandle mh = LINKER.downcallHandle(
60                 FunctionDescriptor.ofVoid());
61         mh.invokeExact(MemorySegment.NULL);
62     }
63 
64     @Test
65     public void testNULLReturn_target() throws Throwable {
66         MethodHandle mh = LINKER.downcallHandle(SymbolLookup.loaderLookup().find("get_null").get(),
67                 FunctionDescriptor.of(ValueLayout.ADDRESS.withTargetLayout(ValueLayout.JAVA_INT)));
68         MemorySegment ret = (MemorySegment)mh.invokeExact();
69         assertTrue(ret.equals(MemorySegment.NULL));
70     }
71 
72     @Test
73     public void testNULLReturn_plain() throws Throwable {
74         MethodHandle mh = LINKER.downcallHandle(SymbolLookup.loaderLookup().find("get_null").get(),
75                 FunctionDescriptor.of(ValueLayout.ADDRESS));
76         MemorySegment ret = (MemorySegment)mh.invokeExact();
77         assertTrue(ret.equals(MemorySegment.NULL));
78     }
79 }