jdk8-mips64-public/hotspot: test/compiler/c2/TestReplacedNodesOSR.java@b1f3fbe39975

     1 /*

     2  * Copyright (c) 2017, Red Hat, Inc. All rights reserved.

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    24 /**

    25  * @test

    26  * @bug 8174164

    27  * @summary SafePointNode::_replaced_nodes breaks with irreducible loops

    28  * @run main/othervm -XX:-BackgroundCompilation TestReplacedNodesOSR

    29  *

    30  */

    32 public class TestReplacedNodesOSR {

    34     static Object dummy;

    36     static interface I {

    37     }

    39     static class A implements I {

    40     }

    42     static final class MyException extends Exception {

    43     }

    45     static final A obj = new A();

    46     static I static_field() { return obj; }

    48     // When OSR compiled, this method has an irreducible loop

    49     static void test(int v, MyException e) {

    50         int i = 0;

    51         for (;;) {

    52             if (i == 1000) {

    53                 break;

    54             }

    55             try {

    56                 if ((i%2) == 0) {

    57                     int j = 0;

    58                     for (;;) {

    59                         j++;

    60                         if (i+j != v) {

    61                             if (j == 1000) {

    62                                 break;

    63                             }

    64                         } else {

    65                             A a = (A)static_field();

    66                             // replaced node recorded here

    67                             throw e;

    68                         }

    69                     }

    70                 }

    71             } catch(MyException ex) {

    72             }

    73             i++;

    74             // replaced node applied on return of the method

    75             // replaced node used here

    76             dummy = static_field();

    77         }

    78     }

    81     static public void main(String[] args) {

    82         for (int i = 0; i < 1000; i++) {

    83             test(1100, new MyException());

    84         }

    85     }

    86 }

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