jdk

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/*
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 * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test
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 * @bug 8310297
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 * @summary Negative fields shorter than an int may not be sign extended in cpool
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 *          but should in static field initializers. javac gives an error for this but
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 *          not other sources of bytecodes.  With checked_cast<> this crashes.
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 * @compile CompatByteFieldInit.jasm
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 * @run main ByteFieldInitTest
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 */
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import java.lang.reflect.Field;
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public class ByteFieldInitTest {
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    final static byte b = -128;     // compare with 0x80
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    final static short s = -32768;  // compare with 0x8000
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    public static void main(java.lang.String[] unused) throws Exception {
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        // javac is smart enough to complain about the other class's byte and short values when referred
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        // to directly.  With checked_cast<> loading this class should fail.
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        Class<?> c = Class.forName("CompatByteFieldInit");
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        Field cb = c.getDeclaredField("b");
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        Field cs = c.getDeclaredField("s");
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        if (b != cb.getByte(null) || s != cs.getShort(null)) {
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            throw new RuntimeException("constant pool init not compatible " + cb.getByte(null) + " " + cs.getShort(null));
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        } else {
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            System.out.println("Fields are same test passed");
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        }
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    }
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}
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