/*

 * Copyright (c) 2015 SAP SE. 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

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 */

/*

 * @test

 * @summary Test that overflowed integers passed to arraycopy don't do any harm. This might

 *          be the case on platforms where C-code expects that ints passed to a call

 *          are properly sign extended to 64 bit (e.g., PPC64, s390x). This can fail

 *          if slow_arraycopy_C() is commpiled by the C compiler without any imlicit

 *          casts (as spill stores to the stack that are done with 4-byte instruction).

 *

 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement

 *                   compiler.arraycopy.TestArrayCopyOverflowArguments

 */

package compiler.arraycopy;

public class TestArrayCopyOverflowArguments {

    // Without volatile the overflowing computation was moved up and then

    // spilled to the stack. The 32-bit spill store caused proper rounding.

    static volatile int mod = Integer.MAX_VALUE;

    public static int[] m1(Object src) {

        if (src == null) return null;

        int[] dest = new int[10];

        try {

            // PPC C calling conventions require that ints are properly expanded

            // to longs when passed to a function.

            int pos   =  8 + mod + mod; // = 0x1_0000_0006.

            int start =  2 + mod + mod; // = 0x1_0000_0000.

            int len   = 12 + mod + mod; // = 0x1_0000_0010.

            // This is supposed to call SharedRuntime::slow_arraycopy_C().

            System.arraycopy(src, pos, dest, 0, 10);

        } catch (ArrayStoreException npe) {

        }

        return dest;

    }

    static public void main(String[] args) throws Exception {

        int[] src = new int[20];

        for (int i  = 0; i < 20; ++i) {

            src[i] = i * (i-1);

        }

        for (int i = 0; i < 20000; i++) {

            m1(src);

        }

    }

}