1 /*
   2  * Copyright (c) 2013, 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 8027571
  27  * @summary meet of TopPTR exact array with constant array is not symmetric
  28  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseOnStackReplacement -XX:TypeProfileLevel=222 -XX:+UnlockExperimentalVMOptions -XX:+UseTypeSpeculation -XX:-BackgroundCompilation TestMeetTopArrayExactConstantArray
  29  *
  30  */
  31 
  32 public class TestMeetTopArrayExactConstantArray {
  33 
  34     static class A {
  35     }
  36 
  37     static class B {
  38     }
  39 
  40     static class C extends A {
  41     }
  42 
  43     static class D extends C {
  44     }
  45 
  46     final static B[] b = new B[10];
  47 
  48     static void m0(Object[] o) {
  49         if (o.getClass() ==  Object[].class) {
  50         }
  51     }
  52 
  53     static void m1(Object[] o, boolean cond) {
  54         if (cond) {
  55             o = b;
  56         }
  57         m0(o);
  58     }
  59 
  60     static void m2(Object[] o, boolean cond1, boolean cond2) {
  61         if (cond1) {
  62             m1(o, cond2);
  63         }
  64     }
  65 
  66     static void m3(C[] o, boolean cond1, boolean cond2, boolean cond3) {
  67         if (cond1) {
  68             m2(o, cond2, cond3);
  69         }
  70     }
  71 
  72     static public void main(String[] args) {
  73         A[] a = new A[10];
  74         D[] d = new D[10];
  75         Object[] o = new Object[10];
  76         for (int i = 0; i < 5000; i++) {
  77             // record in profiling that the if in m0 succeeds
  78             m0(o);
  79             // record some profiling for m2 and m1
  80             m2(a, true, (i%2) == 0);
  81             // record some profiling for m3 and conflicting profile for m2
  82             m3(d, true, false, (i%2) == 0);
  83         }
  84         
  85         // get m3 compiled. The if in m0 will be optimized because of argument profiling in m3
  86         C[] c = new C[10];
  87         for (int i = 0; i < 20000; i++) {
  88             m3(c, true, false, (i%2) == 0);
  89         }
  90         // make m3 not entrant and the if in m0 fail
  91         m3(c, true, true, false);
  92         m3(c, true, true, false);
  93         m3(c, true, true, false);
  94         m3(c, true, true, false);
  95 
  96         // make m3 recompile, this time with if the not optimized
  97         // on entry to m3, argument o is of type C[], profiled C[]
  98         // on entry to m1, argument o is of type C[], speculative C[] exact, profiled A[]. Speculative becomes AnyNull
  99         // after the if in m1, speculative type of o becomes constant from final field b
 100         // the true if branch in m0 does a join between the type of o of speculative type constant from final field b and exact klass Object[]
 101         for (int i = 0; i < 20000; i++) {
 102             m3(c, true, false, (i%2) == 0);
 103         }        
 104 
 105         System.out.println("TEST PASSED");
 106     }
 107 }