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
21  * questions.
22  */
23 
24 /**
25  * @test
26  * @bug 8381063
27  * @summary Verify that null is passed for jobject parameter to JVMTI SampledObjectAlloc event callbacks.
28  * @requires vm.jvmti
29  *
30  * @enablePreview
31  * @run main/othervm/native -agentlib:SampledObjectAllocValue SampledObjectAllocValue
32  * @run main/othervm/native -agentlib:SampledObjectAllocValue=can_support_value_objects SampledObjectAllocValue
33  */
34 
35 public class SampledObjectAllocValue {
36 
37     private static value class ValueClass {
38         public long x;
39         public long y;
40 
41         public ValueClass(long arg1, long arg2) {
42           x = arg1; y = arg2;
43         }
44     }
45 
46     private static ValueClass[] tmp = new ValueClass[100];
47 
48     private static native void enableEvents(Thread thread, Class testedClass);
49 
50     public static void main(String[] args) throws Exception {
51         enableEvents(Thread.currentThread(), ValueClass.class);
52         // Allocate value objects to trigger JVMTI SampledObjectAlloc events.
53         // Here we assume that flat array layout is not used for ValueClass objects.
54         for (int i = 0; i < tmp.length; i++) {
55             tmp[i] = new ValueClass(i, i + 100);
56         }
57     }
58 }