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 /*

  * Copyright (c) 2001, 2010, 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

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  */

 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP

 #include "gc_implementation/g1/g1RemSet.hpp"

 #include "gc_implementation/g1/heapRegionRemSet.hpp"

 #include "oops/oop.inline.hpp"

 inline size_t G1RemSet::n_workers() {

   if (_g1->workers() != NULL) {

     return _g1->workers()->total_workers();

   } else {

     return 1;

   }

 }

 template <class T>

 inline void G1RemSet::write_ref(HeapRegion* from, T* p) {

   par_write_ref(from, p, 0);

 }

 template <class T>

 inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, int tid) {

   oop obj = oopDesc::load_decode_heap_oop(p);

 #ifdef ASSERT

   // can't do because of races

   // assert(obj == NULL || obj->is_oop(), "expected an oop");

   // Do the safe subset of is_oop

   if (obj != NULL) {

 #ifdef CHECK_UNHANDLED_OOPS

     oopDesc* o = obj.obj();

 #else

     oopDesc* o = obj;

 #endif // CHECK_UNHANDLED_OOPS

     assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");

     assert(Universe::heap()->is_in_reserved(obj), "must be in heap");

   }

 #endif // ASSERT

   assert(from == NULL || from->is_in_reserved(p), "p is not in from");

   HeapRegion* to = _g1->heap_region_containing(obj);

   if (to != NULL && from != to) {

 #if G1_REM_SET_LOGGING

     gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS"

                            " for region [" PTR_FORMAT ", " PTR_FORMAT ")",

                            p, obj,

                            to->bottom(), to->end());

 #endif

     assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");

     to->rem_set()->add_reference(p, tid);

   }

 }

 template <class T>

 inline void UpdateRSOopClosure::do_oop_work(T* p) {

   assert(_from != NULL, "from region must be non-NULL");

   _rs->par_write_ref(_from, p, _worker_i);

 }

 template <class T>

 inline void UpdateRSetImmediate::do_oop_work(T* p) {

   assert(_from->is_in_reserved(p), "paranoia");

   T heap_oop = oopDesc::load_heap_oop(p);

   if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {

     _g1_rem_set->par_write_ref(_from, p, 0);

   }

 }

 template <class T>

 inline void UpdateRSOrPushRefOopClosure::do_oop_work(T* p) {

   oop obj = oopDesc::load_decode_heap_oop(p);

 #ifdef ASSERT

   // can't do because of races

   // assert(obj == NULL || obj->is_oop(), "expected an oop");

   // Do the safe subset of is_oop

   if (obj != NULL) {

 #ifdef CHECK_UNHANDLED_OOPS

     oopDesc* o = obj.obj();

 #else

     oopDesc* o = obj;

 #endif // CHECK_UNHANDLED_OOPS

     assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");

     assert(Universe::heap()->is_in_reserved(obj), "must be in heap");

   }

 #endif // ASSERT

   assert(_from != NULL, "from region must be non-NULL");

   HeapRegion* to = _g1->heap_region_containing(obj);

   if (to != NULL && _from != to) {

     // The _record_refs_into_cset flag is true during the RSet

     // updating part of an evacuation pause. It is false at all

     // other times:

     //  * rebuilding the rembered sets after a full GC

     //  * during concurrent refinement.

     //  * updating the remembered sets of regions in the collection

     //    set in the event of an evacuation failure (when deferred

     //    updates are enabled).

     if (_record_refs_into_cset && to->in_collection_set()) {

       // We are recording references that point into the collection

       // set and this particular reference does exactly that...

       // If the referenced object has already been forwarded

       // to itself, we are handling an evacuation failure and

       // we have already visited/tried to copy this object

       // there is no need to retry.

       if (!self_forwarded(obj)) {

         assert(_push_ref_cl != NULL, "should not be null");

         // Push the reference in the refs queue of the G1ParScanThreadState

         // instance for this worker thread.

         _push_ref_cl->do_oop(p);

       }

       // Deferred updates to the CSet are either discarded (in the normal case),

       // or processed (if an evacuation failure occurs) at the end

       // of the collection.

       // See G1RemSet::cleanup_after_oops_into_collection_set_do().

     } else {

       // We either don't care about pushing references that point into the

       // collection set (i.e. we're not during an evacuation pause) _or_

       // the reference doesn't point into the collection set. Either way

       // we add the reference directly to the RSet of the region containing

       // the referenced object.

       _g1_rem_set->par_write_ref(_from, p, _worker_i);

     }

   }

 }

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP