TestUnsafeMismatchedArrayFieldAccess.java

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/**
 * @test
 * @bug 8142386
 * @summary Unsafe access to an array is wrongly marked as mismatched
 * @modules java.base/jdk.internal.misc
 *
 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation
 *      compiler.intrinsics.unsafe.TestUnsafeMismatchedArrayFieldAccess
 */

package compiler.intrinsics.unsafe;

import jdk.internal.misc.Unsafe;

public class TestUnsafeMismatchedArrayFieldAccess {

    private static final Unsafe UNSAFE = Unsafe.getUnsafe();

    static {
        try {
            array_offset = UNSAFE.objectFieldOffset(TestUnsafeMismatchedArrayFieldAccess.class.getDeclaredField("array"));
        }
        catch (Exception e) {
            throw new AssertionError(e);
        }
    }

    int[] array;
    static final long array_offset;

    void m() {
        UNSAFE.getReference(this, array_offset);
    }

    static public void main(String[] args) {
        TestUnsafeMismatchedArrayFieldAccess test = new TestUnsafeMismatchedArrayFieldAccess();

        for (int i = 0; i < 20000; i++) {
            test.m();
        }
    }
}