test/langtools/tools/javac/patterns/PrimitiveInstanceOfConstantLocalVerifyError.java - master - githubmirror/panama-vector

test/langtools/tools/javac/patterns/PrimitiveInstanceOfConstantLocalVerifyError.java

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Aggelos Biboudis

8379621: Compiler produces unverifiable class-file when using primitive type with instanceof

04 май 2026, 14:21

04 май 2026, 14:214d316a8

/*
 * Copyright (c) 2026, 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.
 *
 * 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 Verify constant locals used in binding patterns are materialized in temps
 * @enablePreview
 * @compile PrimitiveInstanceOfConstantLocalVerifyError.java
 * @compile -g:none PrimitiveInstanceOfConstantLocalVerifyError.java
 * @run main PrimitiveInstanceOfConstantLocalVerifyError
 */

public class PrimitiveInstanceOfConstantLocalVerifyError {
    void run() {
        final int x = 42;
        if (!(x instanceof byte b) || b != 42) {
            throw new AssertionError("primitive pattern failed");
        }

        final String s = "hi";
        if (!(s instanceof CharSequence cs) || !cs.toString().equals("hi")) {
            throw new AssertionError("reference pattern failed");
        }
    }

    public static void main(String[] args) {
        new PrimitiveInstanceOfConstantLocalVerifyError().run();
    }
}