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  * @library ../
28  * @build jdk.test.whitebox.WhiteBox
29  * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
30  *
31  * @run main/othervm
32  *   -Xbootclasspath/a:.
33  *   -XX:+UnlockDiagnosticVMOptions
34  *   -XX:+WhiteBoxAPI
35  *   --enable-native-access=ALL-UNNAMED
36  *   TestReentrantUpcalls
37  */
38 
39 import java.lang.foreign.Arena;
40 import java.lang.foreign.FunctionDescriptor;
41 import java.lang.foreign.MemorySegment;
42 
43 import java.lang.invoke.MethodHandle;
44 import java.lang.invoke.MethodHandles;
45 import java.lang.invoke.MethodType;
46 
47 import jdk.test.whitebox.WhiteBox;
48 
49 import static java.lang.invoke.MethodHandles.lookup;
50 
51 public class TestReentrantUpcalls extends NativeTestHelper {
52     static final WhiteBox WB = WhiteBox.getWhiteBox();
53 
54     static final MethodHandle MH_m;
55 
56     static {
57         System.loadLibrary("ReentrantUpcalls");
58         try {
59             MH_m = lookup().findStatic(TestReentrantUpcalls.class, "m",
60                     MethodType.methodType(void.class, int.class, MemorySegment.class, MethodHandle.class));
61         } catch (ReflectiveOperationException e) {
62             throw new RuntimeException(e);
63         }
64     }
65 
66     public static void main(String[] args) throws Throwable {
67         FunctionDescriptor descriptor = FunctionDescriptor.ofVoid(C_INT, C_POINTER);
68         MethodHandle downcallHandle = downcallHandle("do_recurse", descriptor);
69 
70         try (Arena arena = Arena.ofConfined()) {
71             MemorySegment stub = LINKER.upcallStub(
72                     MethodHandles.insertArguments(MH_m, 2, downcallHandle), descriptor, arena);
73 
74             downcallHandle.invokeExact(0, stub);
75         }
76     }
77 
78     static void m(int depth, MemorySegment thisStub, MethodHandle downcallHandle) throws Throwable {
79         if (depth < 100) {
80             downcallHandle.invokeExact(depth + 1, thisStub);
81         } else {
82             WB.verifyFrames(/*log=*/true, /*updateRegisterMap=*/true);
83             WB.verifyFrames(/*log=*/true, /*updateRegisterMap=*/false); // triggers different code paths
84         }
85     }
86 
87 }