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
  31  *    -XX:CompileCommand=compileonly,compiler.c2.Test6837094::collectIs
  32  *    -XX:CompileCommand=compileonly,compiler.c2.Test6837094$Factory$1::getArray
  33  *    -XX:CompileCommand=compileonly,compiler.c2.Test6837094$Factory$2::getArray
  34  *    compiler.c2.Test6837094
  35  */
  36 
  37 package compiler.c2;
  38 
  39 import java.util.HashSet;
  40 import java.util.Set;
  41 
  42 public class Test6837094 {
  43 
  44   private interface Factory<M extends Interface> {
  45     Factory<Child0> Zero = new Factory<Child0>() {
  46       public Child0[] getArray() { return new Child0[1]; }
  47     };
  48 
  49     Factory<Child1> One = new Factory<Child1>() {
  50       public Child1[] getArray() { return new Child1[1]; }
  51     };
  52 
  53     M[] getArray();
  54   }
  55 
  56   /**
  57    * C2 asserts when compiling this method. Bimorphic inlining happens at
  58    * getArray call site. A Phi in the catch block tries to join the meet type
  59    * from he inline site (Parent[]) with the type expected by CI (Interface[]).
  60    *
  61    * C2 throws an assert when it doesn't need to.
  62    */
  63   private static <I extends Interface> void collectIs(
  64       Factory<I> factory, Set<Interface> s) {
  65     for (I i : factory.getArray()) {
  66       try {
  67         s.add(i);
  68       } catch (Exception e) {
  69       }
  70     }
  71   }
  72 
  73   static public void main(String argv[]) {
  74     Set<Interface> s = new HashSet();
  75 
  76     for (int i = 0; i < 25000; i++) {
  77       collectIs(Factory.Zero, s);
  78       collectIs(Factory.One, s);
  79     }
  80   }
  81 
  82   /**
  83    * Establish necessary class hierarchy
  84    */
  85 
  86   static interface Interface {
  87   }
  88 
  89   static class Parent {
  90   }
  91 
  92   static class Child0 extends Parent implements Interface {
  93   }
  94 
  95   static class Child1 extends Parent implements Interface {
  96   }
  97 
  98   static class Child2 extends Parent implements Interface {
  99   }
 100 
 101 }
 102