1 /*
   2  * Copyright (c) 2005, 2015, Oracle and/or its affiliates. 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 #include "precompiled.hpp"
  26 #include "gc/shared/barrierSet.hpp"
  27 #include "gc/shared/collectedHeap.hpp"
  28 #include "gc/shared/collectedHeap.inline.hpp"
  29 #include "oops/oopsHierarchy.hpp"
  30 #include "runtime/thread.inline.hpp"
  31 #include "utilities/globalDefinitions.hpp"
  32 
  33 #ifdef CHECK_UNHANDLED_OOPS
  34 
  35 void oop::register_oop() {
  36   assert (CheckUnhandledOops, "should only call when CheckUnhandledOops");
  37   if (!Universe::is_fully_initialized()) return;
  38   // This gets expensive, which is why checking unhandled oops is on a switch.
  39   Thread* t = Thread::current_or_null();
  40   if (t != NULL && t->is_Java_thread()) {
  41      frame fr = os::current_frame();
  42      // This points to the oop creator, I guess current frame points to caller
  43      assert (fr.pc(), "should point to a vm frame");
  44      t->unhandled_oops()->register_unhandled_oop(this, fr.pc());
  45   }
  46 }
  47 
  48 void oop::unregister_oop() {
  49   assert (CheckUnhandledOops, "should only call when CheckUnhandledOops");
  50   if (!Universe::is_fully_initialized()) return;
  51   // This gets expensive, which is why checking unhandled oops is on a switch.
  52   Thread* t = Thread::current_or_null();
  53   if (t != NULL && t->is_Java_thread()) {
  54     t->unhandled_oops()->unregister_unhandled_oop(this);
  55   }
  56 }
  57 
  58 bool oop::operator==(const oop o) const {
  59   BarrierSet::barrier_set()->verify_equals(this, o);
  60   return obj() == o.obj();
  61 }
  62 
  63 bool oop::operator!=(const volatile oop o) const {
  64   BarrierSet::barrier_set()->verify_equals(this, o);
  65   return obj() != o.obj();
  66 }
  67 
  68 #endif // CHECK_UNHANDLED_OOPS