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  *
  29  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseOnStackReplacement
  30  *                   -XX:TypeProfileLevel=222 -XX:+UseTypeSpeculation
  31  *                   -XX:-BackgroundCompilation
  32  *                   compiler.types.TestMeetTopArrayExactConstantArray
  33  */
  34 
  35 package compiler.types;
  36 
  37 public class TestMeetTopArrayExactConstantArray {
  38 
  39     static class A {
  40     }
  41 
  42     static class B {
  43     }
  44 
  45     static class C extends A {
  46     }
  47 
  48     static class D extends C {
  49     }
  50 
  51     final static B[] b = new B[10];
  52 
  53     static void m0(Object[] o) {
  54         if (o.getClass() ==  Object[].class) {
  55         }
  56     }
  57 
  58     static void m1(Object[] o, boolean cond) {
  59         if (cond) {
  60             o = b;
  61         }
  62         m0(o);
  63     }
  64 
  65     static void m2(Object[] o, boolean cond1, boolean cond2) {
  66         if (cond1) {
  67             m1(o, cond2);
  68         }
  69     }
  70 
  71     static void m3(C[] o, boolean cond1, boolean cond2, boolean cond3) {
  72         if (cond1) {
  73             m2(o, cond2, cond3);
  74         }
  75     }
  76 
  77     static public void main(String[] args) {
  78         A[] a = new A[10];
  79         D[] d = new D[10];
  80         Object[] o = new Object[10];
  81         for (int i = 0; i < 5000; i++) {
  82             // record in profiling that the if in m0 succeeds
  83             m0(o);
  84             // record some profiling for m2 and m1
  85             m2(a, true, (i%2) == 0);
  86             // record some profiling for m3 and conflicting profile for m2
  87             m3(d, true, false, (i%2) == 0);
  88         }
  89 
  90         // get m3 compiled. The if in m0 will be optimized because of argument profiling in m3
  91         C[] c = new C[10];
  92         for (int i = 0; i < 20000; i++) {
  93             m3(c, true, false, (i%2) == 0);
  94         }
  95         // make m3 not entrant and the if in m0 fail
  96         m3(c, true, true, false);
  97         m3(c, true, true, false);
  98         m3(c, true, true, false);
  99         m3(c, true, true, false);
 100 
 101         // make m3 recompile, this time with if the not optimized
 102         // on entry to m3, argument o is of type C[], profiled C[]
 103         // on entry to m1, argument o is of type C[], speculative C[] exact, profiled A[]. Speculative becomes AnyNull
 104         // after the if in m1, speculative type of o becomes constant from final field b
 105         // 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[]
 106         for (int i = 0; i < 20000; i++) {
 107             m3(c, true, false, (i%2) == 0);
 108         }
 109 
 110         System.out.println("TEST PASSED");
 111     }
 112 }