langtools/test/tools/javac/generics/inference/8058199/T8058199.java
author mcimadamore
Tue, 14 Oct 2014 12:00:39 +0100
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permissions -rw-r--r--
8058199: Code generation problem with javac skipping a checkcast instruction Summary: TransTypes sometimes ignores inferred signatures when emitting synthetic casts Reviewed-by: vromero
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/*
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 * Copyright (c) 2014, 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.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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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 8058199
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 * @summary Code generation problem with javac skipping a checkcast instruction
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 */
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public class T8058199 {
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    final static String SYNTHETIC_CAST_TYPE = "[Ljava.lang.String;";
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    @SuppressWarnings("unchecked")
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    <Z> Z[] makeArr(Z z) { return (Z[])new Object[1]; }
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    <U> void check(U u) { }
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    void testMethod() {
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        test(() -> check(makeArr("")));
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    }
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    void testNewDiamond() {
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        class Check<X> {
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            Check(X x) { }
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        }
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        test(()-> new Check<>(makeArr("")));
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    }
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    void testNewGeneric() {
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        class Check {
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            <Z> Check(Z z) { }
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        }
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        test(()-> new Check(makeArr("")));
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    }
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    private void test(Runnable r) {
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        try {
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            r.run();
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            throw new AssertionError("Missing synthetic cast");
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        } catch (ClassCastException cce) {
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            if (!cce.getMessage().contains(SYNTHETIC_CAST_TYPE)) {
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                throw new AssertionError("Bad type in synthetic cast", cce);
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            }
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        }
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    }
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    public static void main(String[] args) {
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        T8058199 test = new T8058199();
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        test.testMethod();
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        test.testNewDiamond();
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        test.testNewGeneric();
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    }
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}