Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp @ 20197:ce8f6bb717c9
8042195: Introduce umbrella header orderAccess.inline.hpp.
Reviewed-by: dholmes, kvn, stefank, twisti
| author | goetz |
|---|---|
| date | Tue, 29 Apr 2014 15:17:27 +0200 |
| parents | 6a0ad2977919 |
| children | e5035defa3c4 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" | |
| 27 #include "gc_implementation/g1/heapRegion.hpp" | |
| 28 #include "gc_implementation/g1/satbQueue.hpp" | |
| 29 #include "runtime/mutexLocker.hpp" | |
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30 #include "runtime/orderAccess.inline.hpp" |
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31 #include "runtime/thread.inline.hpp" |
| 342 | 32 |
| 33 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap, | |
| 34 int max_covered_regions) : | |
| 35 CardTableModRefBSForCTRS(whole_heap, max_covered_regions) | |
| 36 { | |
| 37 _kind = G1SATBCT; | |
| 38 } | |
| 39 | |
| 40 | |
| 41 void G1SATBCardTableModRefBS::enqueue(oop pre_val) { | |
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42 // Nulls should have been already filtered. |
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43 assert(pre_val->is_oop(true), "Error"); |
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44 |
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45 if (!JavaThread::satb_mark_queue_set().is_active()) return; |
| 342 | 46 Thread* thr = Thread::current(); |
| 47 if (thr->is_Java_thread()) { | |
| 48 JavaThread* jt = (JavaThread*)thr; | |
| 49 jt->satb_mark_queue().enqueue(pre_val); | |
| 50 } else { | |
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51 MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag); |
| 342 | 52 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val); |
| 53 } | |
| 54 } | |
| 55 | |
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56 template <class T> void |
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57 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) { |
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58 if (!JavaThread::satb_mark_queue_set().is_active()) return; |
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59 T* elem_ptr = dst; |
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60 for (int i = 0; i < count; i++, elem_ptr++) { |
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61 T heap_oop = oopDesc::load_heap_oop(elem_ptr); |
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62 if (!oopDesc::is_null(heap_oop)) { |
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63 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop)); |
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64 } |
| 342 | 65 } |
| 66 } | |
| 67 | |
| 12343 | 68 bool G1SATBCardTableModRefBS::mark_card_deferred(size_t card_index) { |
| 69 jbyte val = _byte_map[card_index]; | |
| 70 // It's already processed | |
| 71 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { | |
| 72 return false; | |
| 73 } | |
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74 |
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75 if (val == g1_young_gen) { |
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76 // the card is for a young gen region. We don't need to keep track of all pointers into young |
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77 return false; |
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78 } |
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79 |
| 12343 | 80 // Cached bit can be installed either on a clean card or on a claimed card. |
| 81 jbyte new_val = val; | |
| 82 if (val == clean_card_val()) { | |
| 83 new_val = (jbyte)deferred_card_val(); | |
| 84 } else { | |
| 85 if (val & claimed_card_val()) { | |
| 86 new_val = val | (jbyte)deferred_card_val(); | |
| 87 } | |
| 88 } | |
| 89 if (new_val != val) { | |
| 90 Atomic::cmpxchg(new_val, &_byte_map[card_index], val); | |
| 91 } | |
| 92 return true; | |
| 93 } | |
| 94 | |
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95 void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) { |
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96 jbyte *const first = byte_for(mr.start()); |
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97 jbyte *const last = byte_after(mr.last()); |
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98 |
| 17951 | 99 // Below we may use an explicit loop instead of memset() because on |
| 100 // certain platforms memset() can give concurrent readers phantom zeros. | |
| 101 if (UseMemSetInBOT) { | |
| 102 memset(first, g1_young_gen, last - first); | |
| 103 } else { | |
| 104 for (jbyte* i = first; i < last; i++) { | |
| 105 *i = g1_young_gen; | |
| 106 } | |
| 107 } | |
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108 } |
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109 |
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110 #ifndef PRODUCT |
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111 void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) { |
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112 verify_region(mr, g1_young_gen, true); |
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113 } |
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114 #endif |
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115 |
| 342 | 116 G1SATBCardTableLoggingModRefBS:: |
| 117 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
| 118 int max_covered_regions) : | |
| 119 G1SATBCardTableModRefBS(whole_heap, max_covered_regions), | |
| 120 _dcqs(JavaThread::dirty_card_queue_set()) | |
| 121 { | |
| 122 _kind = G1SATBCTLogging; | |
| 123 } | |
| 124 | |
| 125 void | |
| 126 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field, | |
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127 oop new_val, |
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128 bool release) { |
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129 volatile jbyte* byte = byte_for(field); |
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130 if (*byte == g1_young_gen) { |
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131 return; |
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132 } |
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133 OrderAccess::storeload(); |
| 342 | 134 if (*byte != dirty_card) { |
| 135 *byte = dirty_card; | |
| 136 Thread* thr = Thread::current(); | |
| 137 if (thr->is_Java_thread()) { | |
| 138 JavaThread* jt = (JavaThread*)thr; | |
| 139 jt->dirty_card_queue().enqueue(byte); | |
| 140 } else { | |
| 141 MutexLockerEx x(Shared_DirtyCardQ_lock, | |
| 142 Mutex::_no_safepoint_check_flag); | |
| 143 _dcqs.shared_dirty_card_queue()->enqueue(byte); | |
| 144 } | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 void | |
| 149 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field, | |
| 150 oop new_val) { | |
| 151 uintptr_t field_uint = (uintptr_t)field; | |
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152 uintptr_t new_val_uint = cast_from_oop<uintptr_t>(new_val); |
| 342 | 153 uintptr_t comb = field_uint ^ new_val_uint; |
| 154 comb = comb >> HeapRegion::LogOfHRGrainBytes; | |
| 155 if (comb == 0) return; | |
| 156 if (new_val == NULL) return; | |
| 157 // Otherwise, log it. | |
| 158 G1SATBCardTableLoggingModRefBS* g1_bs = | |
| 159 (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set(); | |
| 160 g1_bs->write_ref_field_work(field, new_val); | |
| 161 } | |
| 162 | |
| 163 void | |
| 164 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) { | |
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165 volatile jbyte* byte = byte_for(mr.start()); |
| 342 | 166 jbyte* last_byte = byte_for(mr.last()); |
| 167 Thread* thr = Thread::current(); | |
| 168 if (whole_heap) { | |
| 169 while (byte <= last_byte) { | |
| 170 *byte = dirty_card; | |
| 171 byte++; | |
| 172 } | |
| 173 } else { | |
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174 // skip all consecutive young cards |
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175 for (; byte <= last_byte && *byte == g1_young_gen; byte++); |
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176 |
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177 if (byte <= last_byte) { |
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178 OrderAccess::storeload(); |
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179 // Enqueue if necessary. |
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180 if (thr->is_Java_thread()) { |
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181 JavaThread* jt = (JavaThread*)thr; |
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182 for (; byte <= last_byte; byte++) { |
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183 if (*byte == g1_young_gen) { |
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184 continue; |
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185 } |
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186 if (*byte != dirty_card) { |
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187 *byte = dirty_card; |
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188 jt->dirty_card_queue().enqueue(byte); |
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189 } |
| 342 | 190 } |
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191 } else { |
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192 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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193 Mutex::_no_safepoint_check_flag); |
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194 for (; byte <= last_byte; byte++) { |
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195 if (*byte == g1_young_gen) { |
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196 continue; |
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197 } |
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198 if (*byte != dirty_card) { |
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199 *byte = dirty_card; |
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200 _dcqs.shared_dirty_card_queue()->enqueue(byte); |
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201 } |
| 342 | 202 } |
| 203 } | |
| 204 } | |
| 205 } | |
| 206 } |