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  *
  29  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:TypeProfileLevel=222
  30  *                   -XX:+UseTypeSpeculation -XX:-BackgroundCompilation
  31  *                   compiler.types.TestSpeculationFailedHigherEqual
  32  */
  33 
  34 package compiler.types;
  35 
  36 public class TestSpeculationFailedHigherEqual {
  37 
  38     static class A {
  39         void m() {}
  40         int i;
  41     }
  42 
  43     static class C extends A {
  44     }
  45 
  46     static C c;
  47 
  48     static A m1(A a, boolean cond) {
  49         // speculative type for a is C not null
  50         if (cond ) {
  51             a = c;
  52         }
  53         // speculative type for a is C (may be null)
  54         int i = a.i;
  55         return a;
  56     }
  57 
  58     static public void main(String[] args) {
  59         C c = new C();
  60         TestSpeculationFailedHigherEqual.c = c;
  61         for (int i = 0; i < 20000; i++) {
  62             m1(c, i%2 == 0);
  63         }
  64 
  65         System.out.println("TEST PASSED");
  66     }
  67 }