/*

 * Copyright (c) 2015, 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.

 *

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 */

/*

 * @test

 * @bug 8080156 8060036

 * @summary Test correctness of type propagation to CmpUNodes.

 *

 * @run main compiler.types.TestTypePropagationToCmpU

 */

package compiler.types;

public class TestTypePropagationToCmpU {

    public static void main(String[] args) {

        try {

            // Trigger compilation

            for (int i = 0; i < 100_000; ++i) {

                test();

            }

        } catch (NullPointerException e) {

            // Test should never throw a NullPointerException

            throw new RuntimeException("Test failed");

        }

    }

    static int global = 42;

    public static void test() {

        int a = Integer.MIN_VALUE;

        int b = global;

        char[] buf = { 0 };

        for (int i = 0; i <= b; ++i) {

            a = i - b;

        }

        // C2 adds a range check and an uncommon trap here to ensure that the array index

        // is in bounds. If type information is not propagated correctly to the corresponding

        // CmpUNode, this trap may be always taken. Because C2 also removes the unnecessary

        // allocation of 'buf', a NullPointerException is thrown in this case.

        char c = buf[(a * 11) / 2 - a]; // a is 0 here if global >= 0

        buf[0] = 0;

    }

}