1 /*
   2  * Copyright 2009 Google 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  *
  23  */
  24 
  25 /**
  26  * @test
  27  * @bug 6837094
  28  * @summary False positive for "meet not symmetric" failure
  29  *
  30  * @run main/othervm -Xbatch -XX:CompileOnly=Test.collectIs,Test$Factory$1.getArray,Test$Factory$2.getArray Test
  31  */
  32 
  33 import java.util.Set;
  34 import java.util.HashSet;
  35 
  36 public class Test {
  37 
  38   private interface Factory<M extends Interface> {
  39     Factory<Child0> Zero = new Factory<Child0>() {
  40       public Child0[] getArray() { return new Child0[1]; }
  41     };
  42 
  43     Factory<Child1> One = new Factory<Child1>() {
  44       public Child1[] getArray() { return new Child1[1]; }
  45     };
  46 
  47     M[] getArray();
  48   }
  49 
  50   /**
  51    * C2 asserts when compiling this method. Bimorphic inlining happens at
  52    * getArray call site. A Phi in the catch block tries to join the meet type
  53    * from he inline site (Parent[]) with the type expected by CI (Interface[]).
  54    *
  55    * C2 throws an assert when it doesn't need to.
  56    */
  57   private static <I extends Interface> void collectIs(
  58       Factory<I> factory, Set<Interface> s) {
  59     for (I i : factory.getArray()) {
  60       try {
  61         s.add(i);
  62       } catch (Exception e) {
  63       }
  64     }
  65   }
  66 
  67   static public void main(String argv[]) {
  68     Set<Interface> s = new HashSet();
  69 
  70     for (int i = 0; i < 25000; i++) {
  71       collectIs(Factory.Zero, s);
  72       collectIs(Factory.One, s);
  73     }
  74   }
  75 }
  76 
  77 /**
  78  * Establish necessary class hierarchy
  79  */
  80 
  81 interface Interface {
  82 }
  83 
  84 class Parent {
  85 }
  86 
  87 class Child0 extends Parent implements Interface {
  88 }
  89 
  90 class Child1 extends Parent implements Interface {
  91 }
  92 
  93 class Child2 extends Parent implements Interface {
  94 }