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
30  */
31 
32 import java.lang.invoke.MethodHandle;
33 import java.lang.invoke.MethodHandles;
34 import java.lang.invoke.MethodType;
35 
36 public value class VMObjectAllocValueTest {
37 
38     private static native int getNumberOfAllocation();
39 
40     public VMObjectAllocValueTest(String str) {
41     }
42 
43     public static void main(String[] args) throws Throwable {
44 
45         MethodHandles.Lookup publicLookup = MethodHandles.publicLookup();
46         MethodType mt = MethodType.methodType(void.class, String.class);
47         MethodHandle mh = publicLookup.findConstructor(VMObjectAllocValueTest.class, mt);
48         mh.invoke("str"); // to trigger a VMObjectAlloc event invoke ctor not from Java
49 
50         if (getNumberOfAllocation() != 1) {
51             throw new Exception("Number of allocation != 1");
52         }
53     }
54 }