test/hotspot/jtreg/gc/epsilon/TestRefArrays.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 */

/**
 * @test TestRefArrays
 * @key gc
 * @requires vm.gc.Epsilon & !vm.graal.enabled
 * @summary Epsilon is able to allocate arrays, and does not corrupt their state
 * @library /test/lib
 *
 * @run main/othervm -Xmx1g                                        -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 * @run main/othervm -Xmx1g -Xint                                  -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 * @run main/othervm -Xmx1g -Xbatch -Xcomp                         -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:-TieredCompilation  -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 *
 * @run main/othervm -Xmx1g                                        -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 * @run main/othervm -Xmx1g -Xint                                  -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 * @run main/othervm -Xmx1g -Xbatch -Xcomp                         -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:-TieredCompilation  -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
 */

import java.util.Random;

public class TestRefArrays {

  static long SEED = Long.getLong("seed", System.nanoTime());
  static int COUNT = Integer.getInteger("count", 1000); // ~500 MB allocation

  static MyObject[][] arr;

  public static void main(String[] args) throws Exception {
    Random r = new Random(SEED);

    arr = new MyObject[COUNT * 100][];
    for (int c = 0; c < COUNT; c++) {
      arr[c] = new MyObject[c * 100];
      for (int v = 0; v < c; v++) {
        arr[c][v] = new MyObject(r.nextInt());
      }
    }

    r = new Random(SEED);
    for (int c = 0; c < COUNT; c++) {
      MyObject[] b = arr[c];
      if (b.length != (c * 100)) {
        throw new IllegalStateException("Failure: length = " + b.length + ", need = " + (c*100));
      }
      for (int v = 0; v < c; v++) {
        int actual = b[v].id();
        int expected = r.nextInt();
        if (actual != expected) {
          throw new IllegalStateException("Failure: expected = " + expected + ", actual = " + actual);
        }
      }
    }
  }

  public static class MyObject {
    int id;
    public MyObject(int id) {
      this.id = id;
    }
    public int id() {
      return id;
    }
  }
}