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1 /*
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2 * Copyright 2005-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 inline void oopDesc::update_contents(ParCompactionManager* cm) {
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26 // The klass field must be updated before anything else
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27 // can be done.
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28 DEBUG_ONLY(klassOopDesc* original_klass = klass());
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29
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30 // Can the option to update and/or copy be moved up in the
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31 // call chain to avoid calling into here?
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32
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33 if (PSParallelCompact::should_update_klass(klass())) {
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34 update_header();
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35 assert(klass()->is_klass(), "Not updated correctly");
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36 } else {
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37 assert(klass()->is_klass(), "Not updated");
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38 }
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39
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40 Klass* new_klass = blueprint();
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41 if (!new_klass->oop_is_typeArray()) {
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42 // It might contain oops beyond the header, so take the virtual call.
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43 new_klass->oop_update_pointers(cm, this);
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44 }
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45 // Else skip it. The typeArrayKlass in the header never needs scavenging.
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46 }
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47
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48 inline void oopDesc::update_contents(ParCompactionManager* cm,
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49 HeapWord* begin_limit,
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50 HeapWord* end_limit) {
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51 // The klass field must be updated before anything else
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52 // can be done.
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53 debug_only(klassOopDesc* original_klass = klass());
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54
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55 update_contents(cm, klass(), begin_limit, end_limit);
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56 }
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57
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58 inline void oopDesc::update_contents(ParCompactionManager* cm,
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59 klassOop old_klass,
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60 HeapWord* begin_limit,
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61 HeapWord* end_limit) {
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62
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63 klassOop updated_klass =
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64 PSParallelCompact::summary_data().calc_new_klass(old_klass);
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65
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66 // Needs to be boundary aware for the 64 bit case
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67 // update_header();
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68 // The klass has moved. Is the location of the klass
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69 // within the limits?
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70 if ((((HeapWord*)&_klass) >= begin_limit) &&
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71 (((HeapWord*)&_klass) < end_limit)) {
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72 set_klass(updated_klass);
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73 }
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74
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75 Klass* klass = updated_klass->klass_part();
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76 if (!klass->oop_is_typeArray()) {
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77 // It might contain oops beyond the header, so take the virtual call.
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78 klass->oop_update_pointers(cm, this, begin_limit, end_limit);
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79 }
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80 // Else skip it. The typeArrayKlass in the header never needs scavenging.
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81 }
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82
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83 inline void oopDesc::follow_contents(ParCompactionManager* cm) {
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84 assert (PSParallelCompact::mark_bitmap()->is_marked(this),
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85 "should be marked");
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86 blueprint()->oop_follow_contents(cm, this);
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87 }
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88
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89 // Used by parallel old GC.
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90
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91 inline void oopDesc::follow_header(ParCompactionManager* cm) {
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92 PSParallelCompact::mark_and_push(cm, (oop*)&_klass);
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93 }
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94
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95 inline oop oopDesc::forward_to_atomic(oop p) {
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96 assert(ParNewGeneration::is_legal_forward_ptr(p),
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97 "illegal forwarding pointer value.");
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98 markOop oldMark = mark();
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99 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
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100 markOop curMark;
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101
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102 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
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103 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
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104
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105 while (!is_forwarded()) {
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106 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
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107 if (curMark == oldMark) {
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108 assert(is_forwarded(), "the CAS should have succeeded.");
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109 return NULL;
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110 }
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111 oldMark = curMark;
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112 }
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113 return forwardee();
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114 }
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115
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116 inline void oopDesc::update_header() {
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117 PSParallelCompact::adjust_pointer((oop*)&_klass);
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118 }
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119
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120 inline void oopDesc::update_header(HeapWord* beg_addr, HeapWord* end_addr) {
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121 PSParallelCompact::adjust_pointer((oop*)&_klass, beg_addr, end_addr);
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122 }
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