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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

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 * 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

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 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

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/*

 * @test

 * @bug 8144212

 * @summary Check for correct memory flow with the String compress/inflate intrinsics.

 * @modules java.base/jdk.internal.misc

 * @library /testlibrary

 *

 * @run main compiler.intrinsics.string.TestStringIntrinsicMemoryFlow

 */

package compiler.intrinsics.string;

import jdk.test.lib.Asserts;

public class TestStringIntrinsicMemoryFlow {

    public static void main(String[] args) {

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

            String s = "MyString";

            char[] c = {'M'};

            char res = testInflate1(s);

            Asserts.assertEquals(res, 'M', "testInflate1 failed");

            res = testInflate2(s);

            Asserts.assertEquals(res, (char)42, "testInflate2 failed");

            res = testCompress1(c);

            Asserts.assertEquals(res, 'M', "testCompress1 failed");

            byte resB = testCompress2(c);

            Asserts.assertEquals(resB, (byte)42, "testCompress2 failed");

        }

    }

    private static char testInflate1(String s) {

        char c[] = new char[1];

        // Inflate String from byte[] to char[]

        s.getChars(0, 1, c, 0);

        // Read char[] memory written by inflate intrinsic

        return c[0];

    }

    private static char testInflate2(String s) {

        char c1[] = new char[1];

        char c2[] = new char[1];

        c2[0] = 42;

        // Inflate String from byte[] to char[]

        s.getChars(0, 1, c1, 0);

        // Read char[] memory written before inflation

        return c2[0];

    }

    private static char testCompress1(char[] c) {

        // Compress String from char[] to byte[]

        String s = new String(c);

        // Read the memory written by compress intrinsic

        return s.charAt(0);

    }

    private static byte testCompress2(char[] c) {

        byte b1[] = new byte[1];

        b1[0] = 42;

        // Compress String from char[] to byte[]

        new String(c);

        // Read byte[] memory written before compression

        return b1[0];

    }

}