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JDK-8244315 [lworld] The hierarchy between V$ref and V$val must be sealed #123

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@@ -1685,7 +1685,7 @@ public ClassSymbol referenceProjection() {
ct.projection = projectedType;

Name projectionName = this.name.append('$', this.name.table.names.ref);
long projectionFlags = (this.flags() & ~(VALUE | UNATTRIBUTED));
long projectionFlags = (this.flags() & ~(VALUE | UNATTRIBUTED | FINAL)) | SEALED;

projection = new ClassSymbol(projectionFlags, projectionName, projectedType, this.owner);
projection.members_field = WriteableScope.create(projection);
@@ -1709,6 +1709,7 @@ public ClassSymbol referenceProjection() {
projection.completer = Completer.NULL_COMPLETER;
projection.sourcefile = this.sourcefile;
projection.flatname = this.flatname.append('$', this.name.table.names.ref);
projection.permitted = List.of(this);
projection.projection = this;
projectedType.tsym = projection;
return projection;
@@ -0,0 +1,49 @@
/*
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/*
* @test
* @summary Check to see if the reference projection is a sealed class
* @bug 8244315
* @modules jdk.jdeps/com.sun.tools.classfile
* @compile -XDallowWithFieldOperator Point.java
* @run main ProjectionSealed
*/

import com.sun.tools.classfile.*;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info;

public class ProjectionSealed {
public static void main(String[] args) throws Exception {
ClassFile clsProj = ClassFile.read(ProjectionSealed.class.getResourceAsStream("Point$ref.class"));

PermittedSubclasses_attribute permitted = (PermittedSubclasses_attribute)clsProj.attributes.get(Attribute.PermittedSubclasses);
CONSTANT_Class_info[] infos = permitted != null ? permitted.getSubtypes(clsProj.constant_pool) : new CONSTANT_Class_info[0];

if (infos.length != 1 || !infos[0].getName().equals("Point")) {
throw new RuntimeException("Sealed classes not present");
}
}
}