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src/share/vm/oops/oop.pcgc.inline.hpp@f90c822e73f8 (annotated)
src/share/vm/oops/oop.pcgc.inline.hpp
Wed, 27 Apr 2016 01:25:04 +0800
- author
- aoqi
- date
- Wed, 27 Apr 2016 01:25:04 +0800
- changeset 0
- f90c822e73f8
- child 6876
- 710a3c8b516e
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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP |
| aoqi@0 | 26 | #define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "utilities/macros.hpp" |
| aoqi@0 | 29 | #if INCLUDE_ALL_GCS |
| aoqi@0 | 30 | #include "gc_implementation/parNew/parNewGeneration.hpp" |
| aoqi@0 | 31 | #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
| aoqi@0 | 32 | #include "gc_implementation/parallelScavenge/psCompactionManager.hpp" |
| aoqi@0 | 33 | #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" |
| aoqi@0 | 34 | #include "gc_implementation/parallelScavenge/psScavenge.hpp" |
| aoqi@0 | 35 | #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" |
| aoqi@0 | 36 | #endif // INCLUDE_ALL_GCS |
| aoqi@0 | 37 | |
| aoqi@0 | 38 | inline void oopDesc::update_contents(ParCompactionManager* cm) { |
| aoqi@0 | 39 | // The klass field must be updated before anything else |
| aoqi@0 | 40 | // can be done. |
| aoqi@0 | 41 | DEBUG_ONLY(Klass* original_klass = klass()); |
| aoqi@0 | 42 | |
| aoqi@0 | 43 | Klass* new_klass = klass(); |
| aoqi@0 | 44 | if (!new_klass->oop_is_typeArray()) { |
| aoqi@0 | 45 | // It might contain oops beyond the header, so take the virtual call. |
| aoqi@0 | 46 | new_klass->oop_update_pointers(cm, this); |
| aoqi@0 | 47 | } |
| aoqi@0 | 48 | // Else skip it. The TypeArrayKlass in the header never needs scavenging. |
| aoqi@0 | 49 | } |
| aoqi@0 | 50 | |
| aoqi@0 | 51 | inline void oopDesc::follow_contents(ParCompactionManager* cm) { |
| aoqi@0 | 52 | assert (PSParallelCompact::mark_bitmap()->is_marked(this), |
| aoqi@0 | 53 | "should be marked"); |
| aoqi@0 | 54 | klass()->oop_follow_contents(cm, this); |
| aoqi@0 | 55 | } |
| aoqi@0 | 56 | |
| aoqi@0 | 57 | // Used by parallel old GC. |
| aoqi@0 | 58 | |
| aoqi@0 | 59 | inline oop oopDesc::forward_to_atomic(oop p) { |
| aoqi@0 | 60 | assert(ParNewGeneration::is_legal_forward_ptr(p), |
| aoqi@0 | 61 | "illegal forwarding pointer value."); |
| aoqi@0 | 62 | markOop oldMark = mark(); |
| aoqi@0 | 63 | markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p); |
| aoqi@0 | 64 | markOop curMark; |
| aoqi@0 | 65 | |
| aoqi@0 | 66 | assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable"); |
| aoqi@0 | 67 | assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this."); |
| aoqi@0 | 68 | |
| aoqi@0 | 69 | while (!oldMark->is_marked()) { |
| aoqi@0 | 70 | curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark); |
| aoqi@0 | 71 | assert(is_forwarded(), "object should have been forwarded"); |
| aoqi@0 | 72 | if (curMark == oldMark) { |
| aoqi@0 | 73 | return NULL; |
| aoqi@0 | 74 | } |
| aoqi@0 | 75 | // If the CAS was unsuccessful then curMark->is_marked() |
| aoqi@0 | 76 | // should return true as another thread has CAS'd in another |
| aoqi@0 | 77 | // forwarding pointer. |
| aoqi@0 | 78 | oldMark = curMark; |
| aoqi@0 | 79 | } |
| aoqi@0 | 80 | return forwardee(); |
| aoqi@0 | 81 | } |
| aoqi@0 | 82 | |
| aoqi@0 | 83 | #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP |
