1 /*
 2  * Copyright (c) 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  * @library ../ /test/lib
27  * @run testng/othervm --enable-native-access=ALL-UNNAMED TestCritical
28  */
29 
30 import org.testng.annotations.Test;
31 
32 import java.lang.foreign.Arena;
33 import java.lang.foreign.FunctionDescriptor;
34 import java.lang.foreign.Linker;
35 import java.lang.foreign.MemoryLayout;
36 import java.lang.foreign.MemorySegment;
37 import java.lang.foreign.SegmentAllocator;
38 import java.lang.foreign.StructLayout;
39 import java.lang.invoke.MethodHandle;
40 import java.lang.invoke.VarHandle;
41 
42 import static org.testng.Assert.assertEquals;
43 
44 public class TestCritical extends NativeTestHelper {
45 
46     static {
47         System.loadLibrary("Critical");
48     }
49 
50     @Test
51     public void testEmpty() throws Throwable {
52         MethodHandle handle = downcallHandle("empty", FunctionDescriptor.ofVoid(), Linker.Option.critical());
53         handle.invokeExact();
54     }
55 
56     @Test
57     public void testIdentity() throws Throwable {
58         MethodHandle handle = downcallHandle("identity", FunctionDescriptor.of(C_INT, C_INT), Linker.Option.critical());
59         int result = (int) handle.invokeExact(42);
60         assertEquals(result, 42);
61     }
62 
63     @Test
64     public void testWithReturnBuffer() throws Throwable {
65         StructLayout bigLayout = MemoryLayout.structLayout(
66                 C_LONG_LONG.withName("x"),
67                 C_LONG_LONG.withName("y"));
68 
69         MethodHandle handle = downcallHandle("with_return_buffer", FunctionDescriptor.of(bigLayout), Linker.Option.critical());
70         VarHandle vhX = bigLayout.varHandle(MemoryLayout.PathElement.groupElement("x"));
71         VarHandle vhY = bigLayout.varHandle(MemoryLayout.PathElement.groupElement("y"));
72         try (Arena arena = Arena.ofConfined()) {
73             MemorySegment result = (MemorySegment) handle.invokeExact((SegmentAllocator) arena);
74             long x = (long) vhX.get(result, 0L);
75             assertEquals(x, 10);
76             long y = (long) vhY.get(result, 0L);
77             assertEquals(y, 11);
78         }
79     }
80 
81 }