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1 /*
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2 * Copyright 2001-2007 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 OopsInGenClosure::OopsInGenClosure(Generation* gen) :
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26 OopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) {
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27 set_generation(gen);
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28 }
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29
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30 inline void OopsInGenClosure::set_generation(Generation* gen) {
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31 _gen = gen;
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32 _gen_boundary = _gen->reserved().start();
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33 // Barrier set for the heap, must be set after heap is initialized
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34 if (_rs == NULL) {
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35 GenRemSet* rs = SharedHeap::heap()->rem_set();
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36 assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind");
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37 _rs = (CardTableRS*)rs;
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38 }
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39 }
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40
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41 inline void OopsInGenClosure::do_barrier(oop* p) {
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42 assert(generation()->is_in_reserved(p), "expected ref in generation");
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43 oop obj = *p;
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44 assert(obj != NULL, "expected non-null object");
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45 // If p points to a younger generation, mark the card.
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46 if ((HeapWord*)obj < _gen_boundary) {
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47 _rs->inline_write_ref_field_gc(p, obj);
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48 }
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49 }
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50
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51 // NOTE! Any changes made here should also be made
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52 // in FastScanClosure::do_oop();
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53 inline void ScanClosure::do_oop(oop* p) {
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54 oop obj = *p;
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55 // Should we copy the obj?
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56 if (obj != NULL) {
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57 if ((HeapWord*)obj < _boundary) {
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58 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
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59 if (obj->is_forwarded()) {
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60 *p = obj->forwardee();
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61 } else {
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62 *p = _g->copy_to_survivor_space(obj, p);
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63 }
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64 }
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65 if (_gc_barrier) {
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66 // Now call parent closure
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67 do_barrier(p);
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68 }
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69 }
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70 }
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71
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72 inline void ScanClosure::do_oop_nv(oop* p) {
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73 ScanClosure::do_oop(p);
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74 }
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75
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76 // NOTE! Any changes made here should also be made
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77 // in ScanClosure::do_oop();
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78 inline void FastScanClosure::do_oop(oop* p) {
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79 oop obj = *p;
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80 // Should we copy the obj?
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81 if (obj != NULL) {
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82 if ((HeapWord*)obj < _boundary) {
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83 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
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84 if (obj->is_forwarded()) {
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85 *p = obj->forwardee();
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86 } else {
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87 *p = _g->copy_to_survivor_space(obj, p);
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88 }
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89 if (_gc_barrier) {
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90 // Now call parent closure
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91 do_barrier(p);
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92 }
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93 }
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94 }
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95 }
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96
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97 inline void FastScanClosure::do_oop_nv(oop* p) {
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98 FastScanClosure::do_oop(p);
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99 }
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100
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101 // Note similarity to ScanClosure; the difference is that
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102 // the barrier set is taken care of outside this closure.
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103 inline void ScanWeakRefClosure::do_oop(oop* p) {
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104 oop obj = *p;
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105 assert (obj != NULL, "null weak reference?");
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106 // weak references are sometimes scanned twice; must check
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107 // that to-space doesn't already contain this object
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108 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
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109 if (obj->is_forwarded()) {
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110 *p = obj->forwardee();
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111 } else {
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112 *p = _g->copy_to_survivor_space(obj, p);
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113 }
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114 }
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115 }
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116
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117 inline void ScanWeakRefClosure::do_oop_nv(oop* p) {
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118 ScanWeakRefClosure::do_oop(p);
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119 }
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