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 /*

  * Copyright (c) 2001, 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.

  *

  */

 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP

 #include "gc_implementation/g1/concurrentMark.inline.hpp"

 #include "gc_implementation/g1/g1CollectedHeap.hpp"

 #include "gc_implementation/g1/g1OopClosures.hpp"

 #include "gc_implementation/g1/g1RemSet.hpp"

 #include "gc_implementation/g1/heapRegionRemSet.hpp"

 /*

  * This really ought to be an inline function, but apparently the C++

  * compiler sometimes sees fit to ignore inline declarations.  Sigh.

  */

 template <class T>

 inline void FilterIntoCSClosure::do_oop_nv(T* p) {

   T heap_oop = oopDesc::load_heap_oop(p);

   if (!oopDesc::is_null(heap_oop) &&

       _g1->obj_in_cs(oopDesc::decode_heap_oop_not_null(heap_oop))) {

     _oc->do_oop(p);

   }

 }

 template <class T>

 inline void FilterOutOfRegionClosure::do_oop_nv(T* p) {

   T heap_oop = oopDesc::load_heap_oop(p);

   if (!oopDesc::is_null(heap_oop)) {

     HeapWord* obj_hw = (HeapWord*)oopDesc::decode_heap_oop_not_null(heap_oop);

     if (obj_hw < _r_bottom || obj_hw >= _r_end) {

       _oc->do_oop(p);

     }

   }

 }

 // This closure is applied to the fields of the objects that have just been copied.

 template <class T>

 inline void G1ParScanClosure::do_oop_nv(T* p) {

   T heap_oop = oopDesc::load_heap_oop(p);

   if (!oopDesc::is_null(heap_oop)) {

     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

     if (_g1->in_cset_fast_test(obj)) {

       // We're not going to even bother checking whether the object is

       // already forwarded or not, as this usually causes an immediate

       // stall. We'll try to prefetch the object (for write, given that

       // we might need to install the forwarding reference) and we'll

       // get back to it when pop it from the queue

       Prefetch::write(obj->mark_addr(), 0);

       Prefetch::read(obj->mark_addr(), (HeapWordSize*2));

       // slightly paranoid test; I'm trying to catch potential

       // problems before we go into push_on_queue to know where the

       // problem is coming from

       assert((obj == oopDesc::load_decode_heap_oop(p)) ||

              (obj->is_forwarded() &&

                  obj->forwardee() == oopDesc::load_decode_heap_oop(p)),

              "p should still be pointing to obj or to its forwardee");

       _par_scan_state->push_on_queue(p);

     } else {

       _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num());

     }

   }

 }

 template <class T>

 inline void G1ParPushHeapRSClosure::do_oop_nv(T* p) {

   T heap_oop = oopDesc::load_heap_oop(p);

   if (!oopDesc::is_null(heap_oop)) {

     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

     if (_g1->in_cset_fast_test(obj)) {

       Prefetch::write(obj->mark_addr(), 0);

       Prefetch::read(obj->mark_addr(), (HeapWordSize*2));

       // Place on the references queue

       _par_scan_state->push_on_queue(p);

     }

   }

 }

 template <class T>

 inline void G1CMOopClosure::do_oop_nv(T* p) {

   assert(_g1h->is_in_g1_reserved((HeapWord*) p), "invariant");

   assert(!_g1h->is_on_master_free_list(

                     _g1h->heap_region_containing((HeapWord*) p)), "invariant");

   oop obj = oopDesc::load_decode_heap_oop(p);

   if (_cm->verbose_high()) {

     gclog_or_tty->print_cr("[%u] we're looking at location "

                            "*"PTR_FORMAT" = "PTR_FORMAT,

                            _task->worker_id(), p, (void*) obj);

   }

   _task->deal_with_reference(obj);

 }

 template <class T>

 inline void G1RootRegionScanClosure::do_oop_nv(T* p) {

   T heap_oop = oopDesc::load_heap_oop(p);

   if (!oopDesc::is_null(heap_oop)) {

     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

     HeapRegion* hr = _g1h->heap_region_containing((HeapWord*) obj);

     if (hr != NULL) {

       _cm->grayRoot(obj, obj->size(), _worker_id, hr);

     }

   }

 }

 template <class T>

 inline void G1Mux2Closure::do_oop_nv(T* p) {

   // Apply first closure; then apply the second.

   _c1->do_oop(p);

   _c2->do_oop(p);

 }

 template <class T>

 inline void G1TriggerClosure::do_oop_nv(T* p) {

   // Record that this closure was actually applied (triggered).

   _triggered = true;

 }

 template <class T>

 inline void G1InvokeIfNotTriggeredClosure::do_oop_nv(T* p) {

   if (!_trigger_cl->triggered()) {

     _oop_cl->do_oop(p);

   }

 }

 template <class T>

 inline void G1UpdateRSOrPushRefOopClosure::do_oop_nv(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");

   assert(_from->is_in_reserved(p), "p is not in from");

   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().

       return;

     }

     // 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.

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

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

   }

 }

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP