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 package org.openjdk.foreigntest;
25 
26 import java.lang.foreign.*;
27 import java.lang.foreign.Linker.Option;
28 import java.lang.invoke.MethodHandle;
29 import java.lang.invoke.MethodHandles;
30 import java.lang.invoke.MethodType;
31 import java.lang.reflect.Method;
32 
33 public class PanamaMainUnnamedModule {
34 
35     static {
36         System.loadLibrary("LinkerInvokerUnnamed");
37     }
38 
39     public static void main(String[] args) throws Throwable {
40         testReflection();
41         testInvoke();
42         testDirectAccess();
43         testJNIAccess();
44     }
45 
46    public static void testReflection() throws Throwable {
47        Linker linker = Linker.nativeLinker();
48        Method method = Linker.class.getDeclaredMethod("downcallHandle", FunctionDescriptor.class, Option[].class);
49        method.invoke(linker, FunctionDescriptor.ofVoid(), new Linker.Option[0]);
50    }
51 
52    public static void testInvoke() throws Throwable {
53        var mh = MethodHandles.lookup().findVirtual(Linker.class, "downcallHandle",
54            MethodType.methodType(MethodHandle.class, FunctionDescriptor.class, Linker.Option[].class));
55        var downcall = (MethodHandle)mh.invokeExact(Linker.nativeLinker(), FunctionDescriptor.ofVoid(), new Linker.Option[0]);
56    }
57 
58    public static void testDirectAccess() {
59        Linker.nativeLinker().downcallHandle(FunctionDescriptor.ofVoid());
60    }
61 
62    public static void testJNIAccess() {
63         nativeLinker0();
64     }
65 
66     static native void nativeLinker0();
67 }