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annotate src/share/vm/oops/oop.pcgc.inline.hpp @ 10185:d50cc62e94ff

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8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t Summary: In graphKit INT operations were generated to access PtrQueue::_index which has type size_t. This is 64 bit on 64-bit machines. No problems occur on little endian machines as long as the index fits into 32 bit, but on big endian machines the upper part is read, which is zero. This leads to unnecessary branches to the slow path in the runtime. Reviewed-by: twisti, johnc Contributed-by: Martin Doerr <martin.doerr@sap.com>
author johnc
date Wed, 24 Apr 2013 14:48:43 -0700
parents db9981fd3124
children ad72068ac41e
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1 /*
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2 * Copyright (c) 2005, 2012, 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 // Used by parallel old GC.
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58
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59 inline oop oopDesc::forward_to_atomic(oop p) {
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60 assert(ParNewGeneration::is_legal_forward_ptr(p),
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61 "illegal forwarding pointer value.");
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62 markOop oldMark = mark();
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63 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
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64 markOop curMark;
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65
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66 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
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67 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
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68
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69 while (!oldMark->is_marked()) {
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70 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
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71 assert(is_forwarded(), "object should have been forwarded");
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72 if (curMark == oldMark) {
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73 return NULL;
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74 }
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75 // If the CAS was unsuccessful then curMark->is_marked()
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76 // should return true as another thread has CAS'd in another
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77 // forwarding pointer.
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78 oldMark = curMark;
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79 }
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80 return forwardee();
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81 }
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82
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83 inline void oopDesc::update_header(ParCompactionManager* cm) {
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84 PSParallelCompact::adjust_klass(cm, klass());
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85 }
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86
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87 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP