/*

 * Copyright (c) 2012, 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 7190310

 * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops

 * @run main/othervm -Xbatch Test7190310_unsafe

 */

import java.lang.ref.*;

import java.lang.reflect.*;

import sun.misc.Unsafe;

public class Test7190310_unsafe {

  static class TestObject {

    public String toString() {

      return "TestObject";

    }

  };

  private static TestObject str = new TestObject();

  private static final WeakReference ref = new WeakReference(str);

  private TestObject obj;

  public static void main(String[] args) throws Exception {

    Class c = Test7190310_unsafe.class.getClassLoader().loadClass("sun.misc.Unsafe");

    Field f = c.getDeclaredField("theUnsafe");

    f.setAccessible(true);

    Unsafe unsafe = (Unsafe)f.get(c);

    f = Reference.class.getDeclaredField("referent");

    f.setAccessible(true);

    long referent_offset = unsafe.objectFieldOffset(f);

    Test7190310_unsafe t = new Test7190310_unsafe();

    TestObject o = new TestObject();

    t.obj = o;

    // Warmup (compile methods)

    System.err.println("Warmup");

    Object obj = null;

    for (int i = 0; i < 11000; i++) {

      obj = getRef0(ref);

    }

    for (int i = 0; i < 11000; i++) {

      obj = getRef1(unsafe, ref, referent_offset);

    }

    for (int i = 0; i < 11000; i++) {

      obj = getRef2(unsafe, ref, referent_offset);

    }

    for (int i = 0; i < 11000; i++) {

      obj = getRef3(unsafe, ref, referent_offset);

    }

    for (int i = 0; i < 11000; i++) {

      obj = getRef4(unsafe, t, referent_offset);

    }

    // Access verification

    System.err.println("Verification");

    if (!verifyGet(referent_offset, unsafe)) {

      System.exit(97);

    }

    obj = getRef3(unsafe, t, referent_offset);

    if (obj != o) {

      System.out.println("FAILED: unsafe.getObject(Object, " + referent_offset + ") " + obj + " != " + o);

      System.exit(97);

    }

    obj = getRef4(unsafe, t, referent_offset);

    if (obj != o) {

      System.out.println("FAILED: unsafe.getObject(Test7190310, " + referent_offset + ") " + obj + " != " + o);

      System.exit(97);

    }

  }

  static boolean verifyGet(long referent_offset, Unsafe unsafe) throws Exception {

    // Access verification

    System.out.println("referent: " + str);

    Object obj = getRef0(ref);

    if (obj != str) {

      System.out.println("FAILED: weakRef.get() " + obj + " != " + str);

      return false;

    }

    obj = getRef1(unsafe, ref, referent_offset);

    if (obj != str) {

      System.out.println("FAILED: unsafe.getObject(weakRef, " + referent_offset + ") " + obj + " != " + str);

      return false;

    }

    obj = getRef2(unsafe, ref, referent_offset);

    if (obj != str) {

      System.out.println("FAILED: unsafe.getObject(abstRef, " + referent_offset + ") " + obj + " != " + str);

      return false;

    }

    obj = getRef3(unsafe, ref, referent_offset);

    if (obj != str) {

      System.out.println("FAILED: unsafe.getObject(Object, " + referent_offset + ") " + obj + " != " + str);

      return false;

    }

    return true;

  }

  static Object getRef0(WeakReference ref) throws Exception {

    return ref.get();

  }

  static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception {

    return unsafe.getObject(ref, referent_offset);

  }

  static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception {

    return unsafe.getObject(ref, referent_offset);

  }

  static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception {

    return unsafe.getObject(ref, referent_offset);

  }

  static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception {

    return unsafe.getObject(ref, referent_offset);

  }

}