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annotate src/share/vm/oops/oop.pcgc.inline.hpp @ 20804:7848fc12602b

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Merge with jdk8u40-b25
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Tue, 07 Apr 2015 14:58:49 +0200
parents 89152779163c ee019285a52c
children
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1 /*
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
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26 #define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
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27
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28 #include "utilities/macros.hpp"
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29 #if INCLUDE_ALL_GCS
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30 #include "gc_implementation/parNew/parNewGeneration.hpp"
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31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
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32 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"
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33 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
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34 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
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35 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
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36 #endif // INCLUDE_ALL_GCS
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37
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38 inline void oopDesc::update_contents(ParCompactionManager* cm) {
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39 // The klass field must be updated before anything else
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40 // can be done.
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41 DEBUG_ONLY(Klass* original_klass = klass());
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42
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43 Klass* new_klass = klass();
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44 if (!new_klass->oop_is_typeArray()) {
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45 // It might contain oops beyond the header, so take the virtual call.
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46 new_klass->oop_update_pointers(cm, this);
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47 }
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48 // Else skip it. The TypeArrayKlass in the header never needs scavenging.
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49 }
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50
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51 inline void oopDesc::follow_contents(ParCompactionManager* cm) {
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52 assert (PSParallelCompact::mark_bitmap()->is_marked(this),
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53 "should be marked");
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54 klass()->oop_follow_contents(cm, this);
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55 }
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56
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57 inline oop oopDesc::forward_to_atomic(oop p) {
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58 assert(ParNewGeneration::is_legal_forward_ptr(p),
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59 "illegal forwarding pointer value.");
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60 markOop oldMark = mark();
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61 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
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62 markOop curMark;
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63
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64 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
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65 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
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66
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67 while (!oldMark->is_marked()) {
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68 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
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69 assert(is_forwarded(), "object should have been forwarded");
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70 if (curMark == oldMark) {
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71 return NULL;
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72 }
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73 // If the CAS was unsuccessful then curMark->is_marked()
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74 // should return true as another thread has CAS'd in another
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75 // forwarding pointer.
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76 oldMark = curMark;
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77 }
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78 return forwardee();
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79 }
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80
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81 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP