| /* |
| * Copyright 2005-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| inline void oopDesc::update_contents(ParCompactionManager* cm) { |
| // The klass field must be updated before anything else |
| // can be done. |
| DEBUG_ONLY(klassOopDesc* original_klass = klass()); |
| |
| // Can the option to update and/or copy be moved up in the |
| // call chain to avoid calling into here? |
| |
| if (PSParallelCompact::should_update_klass(klass())) { |
| update_header(); |
| assert(klass()->is_klass(), "Not updated correctly"); |
| } else { |
| assert(klass()->is_klass(), "Not updated"); |
| } |
| |
| Klass* new_klass = blueprint(); |
| if (!new_klass->oop_is_typeArray()) { |
| // It might contain oops beyond the header, so take the virtual call. |
| new_klass->oop_update_pointers(cm, this); |
| } |
| // Else skip it. The typeArrayKlass in the header never needs scavenging. |
| } |
| |
| inline void oopDesc::update_contents(ParCompactionManager* cm, |
| HeapWord* begin_limit, |
| HeapWord* end_limit) { |
| // The klass field must be updated before anything else |
| // can be done. |
| debug_only(klassOopDesc* original_klass = klass()); |
| |
| update_contents(cm, klass(), begin_limit, end_limit); |
| } |
| |
| inline void oopDesc::update_contents(ParCompactionManager* cm, |
| klassOop old_klass, |
| HeapWord* begin_limit, |
| HeapWord* end_limit) { |
| |
| klassOop updated_klass = |
| PSParallelCompact::summary_data().calc_new_klass(old_klass); |
| |
| // Needs to be boundary aware for the 64 bit case |
| // update_header(); |
| // The klass has moved. Is the location of the klass |
| // within the limits? |
| if ((((HeapWord*)&_klass) >= begin_limit) && |
| (((HeapWord*)&_klass) < end_limit)) { |
| set_klass(updated_klass); |
| } |
| |
| Klass* klass = updated_klass->klass_part(); |
| if (!klass->oop_is_typeArray()) { |
| // It might contain oops beyond the header, so take the virtual call. |
| klass->oop_update_pointers(cm, this, begin_limit, end_limit); |
| } |
| // Else skip it. The typeArrayKlass in the header never needs scavenging. |
| } |
| |
| inline void oopDesc::follow_contents(ParCompactionManager* cm) { |
| assert (PSParallelCompact::mark_bitmap()->is_marked(this), |
| "should be marked"); |
| blueprint()->oop_follow_contents(cm, this); |
| } |
| |
| // Used by parallel old GC. |
| |
| inline void oopDesc::follow_header(ParCompactionManager* cm) { |
| PSParallelCompact::mark_and_push(cm, (oop*)&_klass); |
| } |
| |
| inline oop oopDesc::forward_to_atomic(oop p) { |
| assert(ParNewGeneration::is_legal_forward_ptr(p), |
| "illegal forwarding pointer value."); |
| markOop oldMark = mark(); |
| markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p); |
| markOop curMark; |
| |
| assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable"); |
| assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this."); |
| |
| while (!is_forwarded()) { |
| curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark); |
| if (curMark == oldMark) { |
| assert(is_forwarded(), "the CAS should have succeeded."); |
| return NULL; |
| } |
| oldMark = curMark; |
| } |
| return forwardee(); |
| } |
| |
| inline void oopDesc::update_header() { |
| PSParallelCompact::adjust_pointer((oop*)&_klass); |
| } |
| |
| inline void oopDesc::update_header(HeapWord* beg_addr, HeapWord* end_addr) { |
| PSParallelCompact::adjust_pointer((oop*)&_klass, beg_addr, end_addr); |
| } |