1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. 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  */
  23 
  24 /*
  25  * @test
  26  * @bug 8027422
  27  * @summary type methods shouldn't always operate on speculative part
  28  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:TypeProfileLevel=222 -XX:+UseTypeSpeculation -XX:-BackgroundCompilation TestSpeculationFailedHigherEqual
  29  *
  30  */
  31 
  32 public class TestSpeculationFailedHigherEqual {
  33 
  34     static class A {
  35         void m() {}
  36         int i;
  37     }
  38 
  39     static class C extends A {
  40     }
  41 
  42     static C c;
  43 
  44     static A m1(A a, boolean cond) {
  45         // speculative type for a is C not null
  46         if (cond ) {
  47             a = c;
  48         }
  49         // speculative type for a is C (may be null)
  50         int i = a.i;
  51         return a;
  52     }
  53 
  54     static public void main(String[] args) {
  55         C c = new C();
  56         TestSpeculationFailedHigherEqual.c = c;
  57         for (int i = 0; i < 20000; i++) {
  58             m1(c, i%2 == 0);
  59         }
  60 
  61         System.out.println("TEST PASSED");
  62     }
  63 }