duke@435: /*
duke@435:  * Copyright (c) 2007 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: inline void ParScanWeakRefClosure::do_oop(oop* p)
duke@435: {
duke@435:   oop obj = *p;
duke@435:   assert (obj != NULL, "null weak reference?");
duke@435:   // weak references are sometimes scanned twice; must check
duke@435:   // that to-space doesn't already contain this object
duke@435:   if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
duke@435:     // we need to ensure that it is copied (see comment in
duke@435:     // ParScanClosure::do_oop_work).
duke@435:     klassOop objK = obj->klass();
duke@435:     markOop m = obj->mark();
duke@435:     if (m->is_marked()) { // Contains forwarding pointer.
duke@435:       *p = ParNewGeneration::real_forwardee(obj);
duke@435:     } else {
duke@435:       size_t obj_sz = obj->size_given_klass(objK->klass_part());
duke@435:       *p = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state,
duke@435:                                                            obj, obj_sz, m);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: inline void ParScanWeakRefClosure::do_oop_nv(oop* p)
duke@435: {
duke@435:   ParScanWeakRefClosure::do_oop(p);
duke@435: }
duke@435: 
duke@435: inline void ParScanClosure::par_do_barrier(oop* p) {
duke@435:   assert(generation()->is_in_reserved(p), "expected ref in generation");
duke@435:   oop obj = *p;
duke@435:   assert(obj != NULL, "expected non-null object");
duke@435:   // If p points to a younger generation, mark the card.
duke@435:   if ((HeapWord*)obj < gen_boundary()) {
duke@435:     rs()->write_ref_field_gc_par(p, obj);
duke@435:   }
duke@435: }
duke@435: 
duke@435: inline void ParScanClosure::do_oop_work(oop* p,
duke@435:                                         bool gc_barrier,
duke@435:                                         bool root_scan) {
duke@435:   oop obj = *p;
duke@435:   assert((!Universe::heap()->is_in_reserved(p) ||
duke@435:           generation()->is_in_reserved(p))
duke@435:          && (generation()->level() == 0 || gc_barrier),
duke@435:          "The gen must be right, and we must be doing the barrier "
duke@435:          "in older generations.");
duke@435:   if (obj != NULL) {
duke@435:     if ((HeapWord*)obj < _boundary) {
duke@435:       assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
duke@435:       // OK, we need to ensure that it is copied.
duke@435:       // We read the klass and mark in this order, so that we can reliably
duke@435:       // get the size of the object: if the mark we read is not a
duke@435:       // forwarding pointer, then the klass is valid: the klass is only
duke@435:       // overwritten with an overflow next pointer after the object is
duke@435:       // forwarded.
duke@435:       klassOop objK = obj->klass();
duke@435:       markOop m = obj->mark();
duke@435:       if (m->is_marked()) { // Contains forwarding pointer.
duke@435:         *p = ParNewGeneration::real_forwardee(obj);
duke@435:       } else {
duke@435:         size_t obj_sz = obj->size_given_klass(objK->klass_part());
duke@435:         *p = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m);
duke@435:         if (root_scan) {
duke@435:           // This may have pushed an object.  If we have a root
duke@435:           // category with a lot of roots, can't let the queue get too
duke@435:           // full:
duke@435:           (void)_par_scan_state->trim_queues(10 * ParallelGCThreads);
duke@435:         }
duke@435:       }
duke@435:       if (gc_barrier) {
duke@435:         // Now call parent closure
duke@435:         par_do_barrier(p);
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: }