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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 #include "incls/_precompiled.incl"
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26 #include "incls/_g1SATBCardTableModRefBS.cpp.incl"
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27
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28 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
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29 int max_covered_regions) :
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30 CardTableModRefBSForCTRS(whole_heap, max_covered_regions)
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31 {
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32 _kind = G1SATBCT;
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33 }
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34
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35
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36 void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
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37 if (!JavaThread::satb_mark_queue_set().active()) return;
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38 Thread* thr = Thread::current();
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39 if (thr->is_Java_thread()) {
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40 JavaThread* jt = (JavaThread*)thr;
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41 jt->satb_mark_queue().enqueue(pre_val);
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42 } else {
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43 MutexLocker x(Shared_SATB_Q_lock);
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44 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
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45 }
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46 }
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47
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48 // When we know the current java thread:
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49 void
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50 G1SATBCardTableModRefBS::write_ref_field_pre_static(void* field,
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51 oop newVal,
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52 JavaThread* jt) {
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53 if (!JavaThread::satb_mark_queue_set().active()) return;
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54 assert(!UseCompressedOops, "Else will need to modify this to deal with narrowOop");
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55 oop preVal = *(oop*)field;
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56 if (preVal != NULL) {
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57 jt->satb_mark_queue().enqueue(preVal);
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58 }
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59 }
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60
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61 void
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62 G1SATBCardTableModRefBS::write_ref_array_pre(MemRegion mr) {
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63 if (!JavaThread::satb_mark_queue_set().active()) return;
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64 assert(!UseCompressedOops, "Else will need to modify this to deal with narrowOop");
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65 oop* elem_ptr = (oop*)mr.start();
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66 while ((HeapWord*)elem_ptr < mr.end()) {
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67 oop elem = *elem_ptr;
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68 if (elem != NULL) enqueue(elem);
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69 elem_ptr++;
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70 }
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71 }
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72
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73
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74
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75 G1SATBCardTableLoggingModRefBS::
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76 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
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77 int max_covered_regions) :
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78 G1SATBCardTableModRefBS(whole_heap, max_covered_regions),
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79 _dcqs(JavaThread::dirty_card_queue_set())
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80 {
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81 _kind = G1SATBCTLogging;
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82 }
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83
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84 void
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85 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
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86 oop new_val) {
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87 jbyte* byte = byte_for(field);
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88 if (*byte != dirty_card) {
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89 *byte = dirty_card;
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90 Thread* thr = Thread::current();
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91 if (thr->is_Java_thread()) {
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92 JavaThread* jt = (JavaThread*)thr;
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93 jt->dirty_card_queue().enqueue(byte);
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94 } else {
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95 MutexLockerEx x(Shared_DirtyCardQ_lock,
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96 Mutex::_no_safepoint_check_flag);
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97 _dcqs.shared_dirty_card_queue()->enqueue(byte);
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98 }
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99 }
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100 }
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101
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102 void
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103 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
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104 oop new_val) {
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105 uintptr_t field_uint = (uintptr_t)field;
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106 uintptr_t new_val_uint = (uintptr_t)new_val;
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107 uintptr_t comb = field_uint ^ new_val_uint;
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108 comb = comb >> HeapRegion::LogOfHRGrainBytes;
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109 if (comb == 0) return;
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110 if (new_val == NULL) return;
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111 // Otherwise, log it.
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112 G1SATBCardTableLoggingModRefBS* g1_bs =
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113 (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
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114 g1_bs->write_ref_field_work(field, new_val);
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115 }
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116
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117 void
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118 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
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119 jbyte* byte = byte_for(mr.start());
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120 jbyte* last_byte = byte_for(mr.last());
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121 Thread* thr = Thread::current();
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122 if (whole_heap) {
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123 while (byte <= last_byte) {
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124 *byte = dirty_card;
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125 byte++;
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126 }
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127 } else {
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128 // Enqueue if necessary.
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129 if (thr->is_Java_thread()) {
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130 JavaThread* jt = (JavaThread*)thr;
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131 while (byte <= last_byte) {
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132 if (*byte != dirty_card) {
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133 *byte = dirty_card;
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134 jt->dirty_card_queue().enqueue(byte);
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135 }
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136 byte++;
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137 }
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138 } else {
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139 MutexLockerEx x(Shared_DirtyCardQ_lock,
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140 Mutex::_no_safepoint_check_flag);
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141 while (byte <= last_byte) {
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142 if (*byte != dirty_card) {
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143 *byte = dirty_card;
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144 _dcqs.shared_dirty_card_queue()->enqueue(byte);
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145 }
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146 byte++;
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147 }
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148 }
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149 }
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150 }
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