1 /*
   2  * Copyright (c) 2019, Red Hat, 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 package gc.epsilon;
  25 
  26 /**
  27  * @test TestArraycopyCheckcast
  28  * @requires vm.gc.Epsilon
  29  * @summary Epsilon is able to handle checkcasted array copies
  30  * @library /test/lib
  31  * @bug 8215724
  32  *
  33  * @run main/othervm -Xmx1g                                        -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestArraycopyCheckcast
  34  * @run main/othervm -Xmx1g -Xint                                  -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestArraycopyCheckcast
  35  * @run main/othervm -Xmx1g -Xbatch -Xcomp                         -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestArraycopyCheckcast
  36  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestArraycopyCheckcast
  37  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:-TieredCompilation  -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestArraycopyCheckcast
  38  */
  39 
  40 public class TestArraycopyCheckcast {
  41 
  42   static int COUNT = Integer.getInteger("count", 1000);
  43 
  44   public static void main(String[] args) throws Exception {
  45     Object[] src = new Object[COUNT];
  46     Object[] dst = new B[COUNT];
  47 
  48     // Test 1. Copy nulls, should succeed
  49     try {
  50       System.arraycopy(src, 0, dst, 0, COUNT);
  51     } catch (ArrayStoreException e) {
  52       throw new IllegalStateException("Should have completed");
  53     }
  54 
  55     // Test 2. Copying incompatible type, should fail
  56     for (int c = 0; c < COUNT; c++) {
  57       src[c] = new A();
  58     }
  59 
  60     try {
  61       System.arraycopy(src, 0, dst, 0, COUNT);
  62       throw new IllegalStateException("Should have failed with ArrayStoreException");
  63     } catch (ArrayStoreException e) {
  64       // Expected
  65     }
  66 
  67     // Test 3. Copying compatible type, should succeeded
  68     for (int c = 0; c < COUNT; c++) {
  69       src[c] = new C();
  70     }
  71 
  72     try {
  73       System.arraycopy(src, 0, dst, 0, COUNT);
  74     } catch (ArrayStoreException e) {
  75       throw new IllegalStateException("Should have completed");
  76     }
  77 
  78     for (int c = 0; c < COUNT; c++) {
  79       if (src[c] != dst[c]) {
  80         throw new IllegalStateException("Copy failed at index " + c);
  81       }
  82     }
  83   }
  84 
  85   static class A {}
  86   static class B extends A {}
  87   static class C extends B {}
  88 }