/*

 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8010927

 * @summary Kitchensink crashed with SIGSEGV, Problematic frame: v ~StubRoutines::checkcast_arraycopy

 * @modules java.base/sun.misc

 * @build Test8010927

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+IgnoreUnrecognizedVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. -Xmx64m -XX:NewSize=20971520 -XX:MaxNewSize=32m -XX:-UseTLAB -XX:-UseAdaptiveSizePolicy Test8010927

 */

import sun.hotspot.WhiteBox;

import java.lang.reflect.Field;

import sun.misc.Unsafe;

/**

 * The test creates uncommitted space between oldgen and young gen

 * by specifying MaxNewSize bigger than NewSize.

 * NewSize = 20971520 = (512*4K) * 10 for 4k pages

 * Then it tries to execute arraycopy() with elements type check

 * to the array at the end of survive space near unused space.

 */

public class Test8010927 {

  private static final Unsafe U;

  static {

    try {

      Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");

      unsafe.setAccessible(true);

      U = (Unsafe) unsafe.get(null);

    } catch (Exception e) {

      throw new Error(e);

    }

  }

  public static Object[] o;

  public static final boolean debug = Boolean.getBoolean("debug");

  // 2 different obect arrays but same element types

  static Test8010927[] masterA;

  static Object[] masterB;

  static final Test8010927 elem = new Test8010927();

  static final WhiteBox wb = WhiteBox.getWhiteBox();

  static final int obj_header_size = U.ARRAY_OBJECT_BASE_OFFSET;

  static final int heap_oop_size = wb.getHeapOopSize();

  static final int card_size = 512;

  static final int one_card = (card_size - obj_header_size)/heap_oop_size;

  static final int surv_size = 2112 * 1024;

  // The size is big to not fit into survive space.

  static final Object[] cache = new Object[(surv_size / card_size)];

  public static void main(String[] args) {

    masterA = new Test8010927[one_card];

    masterB = new Object[one_card];

    for (int i = 0; i < one_card; ++i) {

      masterA[i] = elem;

      masterB[i] = elem;

    }

    // Move cache[] to the old gen.

    long low_limit = wb.getObjectAddress(cache);

    System.gc();

    // Move 'cache' to oldgen.

    long upper_limit = wb.getObjectAddress(cache);

    if ((low_limit - upper_limit) > 0) { // substaction works with unsigned values

      // OldGen is placed before youngger for ParallelOldGC.

      upper_limit = low_limit + 21000000l; // +20971520

    }

    // Each A[one_card] size is 512 bytes,

    // it will take about 40000 allocations to trigger GC.

    // cache[] has 8192 elements so GC should happen

    // each 5th iteration.

    for(long l = 0; l < 20; l++) {

      fill_heap();

      if (debug) {

        System.out.println("test oop_disjoint_arraycopy");

      }

      testA_arraycopy();

      if (debug) {

        System.out.println("test checkcast_arraycopy");

      }

      testB_arraycopy();

      // Execute arraycopy to the topmost array in young gen

      if (debug) {

        int top_index = get_top_address(low_limit, upper_limit);

        if (top_index >= 0) {

          long addr = wb.getObjectAddress(cache[top_index]);

          System.out.println("top_addr: 0x" + Long.toHexString(addr) + ", 0x" + Long.toHexString(addr + 512));

        }

      }

    }

  }

  static void fill_heap() {

    for (int i = 0; i < cache.length; ++i) {

      o = new Test8010927[one_card];

      System.arraycopy(masterA, 0, o, 0, masterA.length);

      cache[i] = o;

    }

    for (long j = 0; j < 256; ++j) {

      o = new Long[10000]; // to trigger GC

    }

  }

  static void testA_arraycopy() {

    for (int i = 0; i < cache.length; ++i) {

      System.arraycopy(masterA, 0, cache[i], 0, masterA.length);

    }

  }

  static void testB_arraycopy() {

    for (int i = 0; i < cache.length; ++i) {

      System.arraycopy(masterB, 0, cache[i], 0, masterB.length);

    }

  }

  static int get_top_address(long min, long max) {

    int index = -1;

    long addr = min;

    for (int i = 0; i < cache.length; ++i) {

      long test = wb.getObjectAddress(cache[i]);

      if (((test - addr) > 0) && ((max - test) > 0)) { // substaction works with unsigned values

        addr = test;

        index = i;

      }

    }

    return index;

  }

}