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 /**
  25  * @test TestArraycopyCheckcast
  26  * @key gc
  27  * @requires vm.gc.Epsilon & !vm.graal.enabled
  28  * @summary Epsilon is able to handle checkcasted array copies
  29  * @library /test/lib
  30  * @bug 8215724
  31  *
  32  * @run main/othervm -Xmx1g                                        -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestArraycopyCheckcast
  33  * @run main/othervm -Xmx1g -Xint                                  -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestArraycopyCheckcast
  34  * @run main/othervm -Xmx1g -Xbatch -Xcomp                         -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestArraycopyCheckcast
  35  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestArraycopyCheckcast
  36  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:-TieredCompilation  -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestArraycopyCheckcast
  37  */
  38 
  39 import java.util.Random;
  40 
  41 public class TestArraycopyCheckcast {
  42 
  43   static int COUNT = Integer.getInteger("count", 1000);
  44 
  45   public static void main(String[] args) throws Exception {
  46     Object[] src = new Object[COUNT];
  47     Object[] dst = new B[COUNT];
  48 
  49     // Test 1. Copy nulls, should succeed
  50     try {
  51       System.arraycopy(src, 0, dst, 0, COUNT);
  52     } catch (ArrayStoreException e) {
  53       throw new IllegalStateException("Should have completed");
  54     }
  55 
  56     // Test 2. Copying incompatible type, should fail
  57     for (int c = 0; c < COUNT; c++) {
  58       src[c] = new A();
  59     }
  60 
  61     try {
  62       System.arraycopy(src, 0, dst, 0, COUNT);
  63       throw new IllegalStateException("Should have failed with ArrayStoreException");
  64     } catch (ArrayStoreException e) {
  65       // Expected
  66     }
  67 
  68     // Test 3. Copying compatible type, should succeeded
  69     for (int c = 0; c < COUNT; c++) {
  70       src[c] = new C();
  71     }
  72 
  73     try {
  74       System.arraycopy(src, 0, dst, 0, COUNT);
  75     } catch (ArrayStoreException e) {
  76       throw new IllegalStateException("Should have completed");
  77     }
  78 
  79     for (int c = 0; c < COUNT; c++) {
  80       if (src[c] != dst[c]) {
  81         throw new IllegalStateException("Copy failed at index " + c);
  82       }
  83     }
  84   }
  85 
  86   static class A {}
  87   static class B extends A {}
  88   static class C extends B {}
  89 }