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 /*

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

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  * 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

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 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP

 #include "gc_implementation/parNew/parNewGeneration.hpp"

 #include "gc_implementation/parNew/parOopClosures.hpp"

 #include "memory/cardTableRS.hpp"

 template <class T> inline void ParScanWeakRefClosure::do_oop_work(T* p) {

   assert (!oopDesc::is_null(*p), "null weak reference?");

   oop obj = oopDesc::load_decode_heap_oop_not_null(p);

   // weak references are sometimes scanned twice; must check

   // that to-space doesn't already contain this object

   if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {

     // we need to ensure that it is copied (see comment in

     // ParScanClosure::do_oop_work).

     Klass* objK = obj->klass();

     markOop m = obj->mark();

     oop new_obj;

     if (m->is_marked()) { // Contains forwarding pointer.

       new_obj = ParNewGeneration::real_forwardee(obj);

     } else {

       size_t obj_sz = obj->size_given_klass(objK);

       new_obj = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state,

                                                                 obj, obj_sz, m);

     }

     oopDesc::encode_store_heap_oop_not_null(p, new_obj);

   }

 }

 inline void ParScanWeakRefClosure::do_oop_nv(oop* p)       { ParScanWeakRefClosure::do_oop_work(p); }

 inline void ParScanWeakRefClosure::do_oop_nv(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); }

 template <class T> inline void ParScanClosure::par_do_barrier(T* p) {

   assert(generation()->is_in_reserved(p), "expected ref in generation");

   assert(!oopDesc::is_null(*p), "expected non-null object");

   oop obj = oopDesc::load_decode_heap_oop_not_null(p);

   // If p points to a younger generation, mark the card.

   if ((HeapWord*)obj < gen_boundary()) {

     rs()->write_ref_field_gc_par(p, obj);

   }

 }

 template <class T>

 inline void ParScanClosure::do_oop_work(T* p,

                                         bool gc_barrier,

                                         bool root_scan) {

   assert((!Universe::heap()->is_in_reserved(p) ||

           generation()->is_in_reserved(p))

          && (generation()->level() == 0 || gc_barrier),

          "The gen must be right, and we must be doing the barrier "

          "in older generations.");

   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 ((HeapWord*)obj < _boundary) {

 #ifndef PRODUCT

       if (_g->to()->is_in_reserved(obj)) {

         tty->print_cr("Scanning field (" PTR_FORMAT ") twice?", p);

         GenCollectedHeap* gch =  (GenCollectedHeap*)Universe::heap();

         Space* sp = gch->space_containing(p);

         oop obj = oop(sp->block_start(p));

         assert((HeapWord*)obj < (HeapWord*)p, "Error");

         tty->print_cr("Object: " PTR_FORMAT, (void *)obj);

         tty->print_cr("-------");

         obj->print();

         tty->print_cr("-----");

         tty->print_cr("Heap:");

         tty->print_cr("-----");

         gch->print();

         ShouldNotReachHere();

       }

 #endif

       // OK, we need to ensure that it is copied.

       // We read the klass and mark in this order, so that we can reliably

       // get the size of the object: if the mark we read is not a

       // forwarding pointer, then the klass is valid: the klass is only

       // overwritten with an overflow next pointer after the object is

       // forwarded.

       Klass* objK = obj->klass();

       markOop m = obj->mark();

       oop new_obj;

       if (m->is_marked()) { // Contains forwarding pointer.

         new_obj = ParNewGeneration::real_forwardee(obj);

         oopDesc::encode_store_heap_oop_not_null(p, new_obj);

 #ifndef PRODUCT

         if (TraceScavenge) {

           gclog_or_tty->print_cr("{%s %s ( " PTR_FORMAT " ) " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",

              "forwarded ",

              new_obj->klass()->internal_name(), p, (void *)obj, (void *)new_obj, new_obj->size());

         }

 #endif

       } else {

         size_t obj_sz = obj->size_given_klass(objK);

         new_obj = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m);

         oopDesc::encode_store_heap_oop_not_null(p, new_obj);

         if (root_scan) {

           // This may have pushed an object.  If we have a root

           // category with a lot of roots, can't let the queue get too

           // full:

           (void)_par_scan_state->trim_queues(10 * ParallelGCThreads);

         }

       }

       if (is_scanning_a_klass()) {

         do_klass_barrier();

       } else if (gc_barrier) {

         // Now call parent closure

         par_do_barrier(p);

       }

     }

   }

 }

 inline void ParScanWithBarrierClosure::do_oop_nv(oop* p)       { ParScanClosure::do_oop_work(p, true, false); }

 inline void ParScanWithBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); }

 inline void ParScanWithoutBarrierClosure::do_oop_nv(oop* p)       { ParScanClosure::do_oop_work(p, false, false); }

 inline void ParScanWithoutBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); }

 #endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP