1 /* 2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 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_OOPS_OOP_PCGC_INLINE_HPP 26 #define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP 27 28 #include "runtime/atomic.inline.hpp" 29 #include "utilities/macros.hpp" 30 #if INCLUDE_ALL_GCS 31 #include "gc_implementation/parNew/parNewGeneration.hpp" 32 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 33 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp" 34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" 35 #include "gc_implementation/parallelScavenge/psScavenge.hpp" 36 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" 37 #endif // INCLUDE_ALL_GCS 38 39 inline void oopDesc::update_contents(ParCompactionManager* cm) { 40 // The klass field must be updated before anything else 41 // can be done. 42 DEBUG_ONLY(Klass* original_klass = klass()); 43 44 Klass* new_klass = klass(); 45 if (!new_klass->oop_is_typeArray()) { 46 // It might contain oops beyond the header, so take the virtual call. 47 new_klass->oop_update_pointers(cm, this); 48 } 49 // Else skip it. The TypeArrayKlass in the header never needs scavenging. 50 } 51 52 inline void oopDesc::follow_contents(ParCompactionManager* cm) { 53 assert (PSParallelCompact::mark_bitmap()->is_marked(this), 54 "should be marked"); 55 klass()->oop_follow_contents(cm, this); 56 } 57 58 inline oop oopDesc::forward_to_atomic(oop p) { 59 assert(ParNewGeneration::is_legal_forward_ptr(p), 60 "illegal forwarding pointer value."); 61 markOop oldMark = mark(); 62 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p); 63 markOop curMark; 64 65 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable"); 66 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this."); 67 68 while (!oldMark->is_marked()) { 69 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark); 70 assert(is_forwarded(), "object should have been forwarded"); 71 if (curMark == oldMark) { 72 return NULL; 73 } 74 // If the CAS was unsuccessful then curMark->is_marked() 75 // should return true as another thread has CAS'd in another 76 // forwarding pointer. 77 oldMark = curMark; 78 } 79 return forwardee(); 80 } 81 82 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP