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src/share/vm/gc/cms/parOopClosures.inline.hpp

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  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 #ifndef SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP
  26 #define SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP
  27 
  28 #include "gc/cms/parNewGeneration.hpp"
  29 #include "gc/cms/parOopClosures.hpp"
  30 #include "gc/shared/cardTableRS.hpp"
  31 #include "gc/shared/genCollectedHeap.hpp"
  32 #include "gc/shared/genOopClosures.inline.hpp"

  33 
  34 template <class T> inline void ParScanWeakRefClosure::do_oop_work(T* p) {
  35   assert (!oopDesc::is_null(*p), "null weak reference?");
  36   oop obj = oopDesc::load_decode_heap_oop_not_null(p);
  37   // weak references are sometimes scanned twice; must check
  38   // that to-space doesn't already contain this object
  39   if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
  40     // we need to ensure that it is copied (see comment in
  41     // ParScanClosure::do_oop_work).
  42     Klass* objK = obj->klass();
  43     markOop m = obj->mark();
  44     oop new_obj;
  45     if (m->is_marked()) { // Contains forwarding pointer.
  46       new_obj = ParNewGeneration::real_forwardee(obj);
  47     } else {
  48       size_t obj_sz = obj->size_given_klass(objK);
  49       new_obj = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state,
  50                                                                 obj, obj_sz, m);
  51     }
  52     oopDesc::encode_store_heap_oop_not_null(p, new_obj);


  91         obj->print();
  92         tty->print_cr("-----");
  93         tty->print_cr("Heap:");
  94         tty->print_cr("-----");
  95         gch->print();
  96         ShouldNotReachHere();
  97       }
  98 #endif
  99       // OK, we need to ensure that it is copied.
 100       // We read the klass and mark in this order, so that we can reliably
 101       // get the size of the object: if the mark we read is not a
 102       // forwarding pointer, then the klass is valid: the klass is only
 103       // overwritten with an overflow next pointer after the object is
 104       // forwarded.
 105       Klass* objK = obj->klass();
 106       markOop m = obj->mark();
 107       oop new_obj;
 108       if (m->is_marked()) { // Contains forwarding pointer.
 109         new_obj = ParNewGeneration::real_forwardee(obj);
 110         oopDesc::encode_store_heap_oop_not_null(p, new_obj);
 111 #ifndef PRODUCT
 112         if (TraceScavenge) {
 113           gclog_or_tty->print_cr("{%s %s ( " PTR_FORMAT " ) " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
 114              "forwarded ",
 115              new_obj->klass()->internal_name(), p2i(p), p2i((void *)obj), p2i((void *)new_obj), new_obj->size());
 116         }
 117 #endif
 118 
 119       } else {
 120         size_t obj_sz = obj->size_given_klass(objK);
 121         new_obj = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m);
 122         oopDesc::encode_store_heap_oop_not_null(p, new_obj);
 123         if (root_scan) {
 124           // This may have pushed an object.  If we have a root
 125           // category with a lot of roots, can't let the queue get too
 126           // full:
 127           (void)_par_scan_state->trim_queues(10 * ParallelGCThreads);
 128         }
 129       }
 130       if (is_scanning_a_klass()) {
 131         do_klass_barrier();
 132       } else if (gc_barrier) {
 133         // Now call parent closure
 134         par_do_barrier(p);
 135       }
 136     }
 137   }
 138 }


  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 #ifndef SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP
  26 #define SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP
  27 
  28 #include "gc/cms/parNewGeneration.hpp"
  29 #include "gc/cms/parOopClosures.hpp"
  30 #include "gc/shared/cardTableRS.hpp"
  31 #include "gc/shared/genCollectedHeap.hpp"
  32 #include "gc/shared/genOopClosures.inline.hpp"
  33 #include "logging/log.hpp"
  34 
  35 template <class T> inline void ParScanWeakRefClosure::do_oop_work(T* p) {
  36   assert (!oopDesc::is_null(*p), "null weak reference?");
  37   oop obj = oopDesc::load_decode_heap_oop_not_null(p);
  38   // weak references are sometimes scanned twice; must check
  39   // that to-space doesn't already contain this object
  40   if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
  41     // we need to ensure that it is copied (see comment in
  42     // ParScanClosure::do_oop_work).
  43     Klass* objK = obj->klass();
  44     markOop m = obj->mark();
  45     oop new_obj;
  46     if (m->is_marked()) { // Contains forwarding pointer.
  47       new_obj = ParNewGeneration::real_forwardee(obj);
  48     } else {
  49       size_t obj_sz = obj->size_given_klass(objK);
  50       new_obj = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state,
  51                                                                 obj, obj_sz, m);
  52     }
  53     oopDesc::encode_store_heap_oop_not_null(p, new_obj);


  92         obj->print();
  93         tty->print_cr("-----");
  94         tty->print_cr("Heap:");
  95         tty->print_cr("-----");
  96         gch->print();
  97         ShouldNotReachHere();
  98       }
  99 #endif
 100       // OK, we need to ensure that it is copied.
 101       // We read the klass and mark in this order, so that we can reliably
 102       // get the size of the object: if the mark we read is not a
 103       // forwarding pointer, then the klass is valid: the klass is only
 104       // overwritten with an overflow next pointer after the object is
 105       // forwarded.
 106       Klass* objK = obj->klass();
 107       markOop m = obj->mark();
 108       oop new_obj;
 109       if (m->is_marked()) { // Contains forwarding pointer.
 110         new_obj = ParNewGeneration::real_forwardee(obj);
 111         oopDesc::encode_store_heap_oop_not_null(p, new_obj);
 112         log_develop(gc, scavenge)("{forwarded  %s ( " PTR_FORMAT " ) " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",



 113              new_obj->klass()->internal_name(), p2i(p), p2i((void *)obj), p2i((void *)new_obj), new_obj->size());



 114       } else {
 115         size_t obj_sz = obj->size_given_klass(objK);
 116         new_obj = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m);
 117         oopDesc::encode_store_heap_oop_not_null(p, new_obj);
 118         if (root_scan) {
 119           // This may have pushed an object.  If we have a root
 120           // category with a lot of roots, can't let the queue get too
 121           // full:
 122           (void)_par_scan_state->trim_queues(10 * ParallelGCThreads);
 123         }
 124       }
 125       if (is_scanning_a_klass()) {
 126         do_klass_barrier();
 127       } else if (gc_barrier) {
 128         // Now call parent closure
 129         par_do_barrier(p);
 130       }
 131     }
 132   }
 133 }
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