1 /*
 2  * Copyright (c) 2026, 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
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22  */
23 
24 /**
25  * @test
26  * @summary Verifies that a VMObjectAlloc event is generated for a value object created using MethodHandle
27  * @requires vm.jvmti
28  * @enablePreview
29  * @run main/othervm/native -agentlib:VMObjectAllocValueTest VMObjectAllocValueTest 0
30  * @run main/othervm/native -agentlib:VMObjectAllocValueTest=can_support_value_objects VMObjectAllocValueTest 1
31  */
32 
33 import java.lang.invoke.MethodHandle;
34 import java.lang.invoke.MethodHandles;
35 import java.lang.invoke.MethodType;
36 
37 public value class VMObjectAllocValueTest {
38 
39     private static native int getNumberOfAllocation();
40 
41     public VMObjectAllocValueTest(String str) {
42     }
43 
44     public static void main(String[] args) throws Throwable {
45 
46         MethodHandles.Lookup publicLookup = MethodHandles.publicLookup();
47         MethodType mt = MethodType.methodType(void.class, String.class);
48         MethodHandle mh = publicLookup.findConstructor(VMObjectAllocValueTest.class, mt);
49         mh.invoke("str"); // to trigger a VMObjectAlloc event invoke ctor not from Java
50 
51         int expected = Integer.parseInt(args[0]);
52         int actual = getNumberOfAllocation();
53 
54         if (actual != expected) {
55             throw new Exception("Number of allocation: expected: " + expected + ", got: " + actual);
56         }
57     }
58 }