TestDeadArrayCopyOnMemChain.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 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 8080699
 * @summary eliminated arraycopy node still reachable through exception edges
 *
 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
 *                   compiler.arraycopy.TestDeadArrayCopyOnMemChain
 */

package compiler.arraycopy;

public class TestDeadArrayCopyOnMemChain {
    static class A {
        int f;
    }

    static void test_helper(Object o) {
    }

    static void test(int src_off, boolean flag) {
        // dst is eliminated first. Eliminating dst causes src to be
        // eliminated. When working on the safepoint at the uncommon
        // trap in the exception handler, the eliminated ArrayCopyNode
        // is reached through the exception edges.
        Object[] dst = new Object[10];
        Object[] src = new Object[10];

        // src_off causes the exception handler to be run sometimes
        try {
            System.arraycopy(src, src_off, dst, 0, 10);
        } catch (IndexOutOfBoundsException ioobe) {
            // flag always false so test becomes uncommon trap. Make
            // sure src is live at the unc.
            if (flag) {
                test_helper(src);
            }
        }
    }

    static public void main(String[] args) {
        for (int i = 0; i < 20000; i++) {
            test((i%2) == 0 ? 0 : -1, false);
        }
    }
}