1 /* 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 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" 30 #include "runtime/thread.inline.hpp" 31 32 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap, 33 int max_covered_regions) : 34 CardTableModRefBSForCTRS(whole_heap, max_covered_regions) 35 { 36 _kind = G1SATBCT; 37 } 38 39 40 void G1SATBCardTableModRefBS::enqueue(oop pre_val) { 41 // Nulls should have been already filtered. 42 assert(pre_val->is_oop(true), "Error"); 43 44 if (!JavaThread::satb_mark_queue_set().is_active()) return; 45 Thread* thr = Thread::current(); 46 if (thr->is_Java_thread()) { 47 JavaThread* jt = (JavaThread*)thr; 48 jt->satb_mark_queue().enqueue(pre_val); 49 } else { 50 MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag); 51 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val); 52 } 53 } 54 55 template <class T> void 56 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) { 57 if (!JavaThread::satb_mark_queue_set().is_active()) return; 58 T* elem_ptr = dst; 59 for (int i = 0; i < count; i++, elem_ptr++) { 60 T heap_oop = oopDesc::load_heap_oop(elem_ptr); 61 if (!oopDesc::is_null(heap_oop)) { 62 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop)); 63 } 64 } 65 } 66 67 G1SATBCardTableLoggingModRefBS:: 68 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, 69 int max_covered_regions) : 70 G1SATBCardTableModRefBS(whole_heap, max_covered_regions), 71 _dcqs(JavaThread::dirty_card_queue_set()) 72 { 73 _kind = G1SATBCTLogging; 74 } 75 76 void 77 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field, 78 oop new_val) { 79 jbyte* byte = byte_for(field); 80 if (*byte != dirty_card) { 81 *byte = dirty_card; 82 Thread* thr = Thread::current(); 83 if (thr->is_Java_thread()) { 84 JavaThread* jt = (JavaThread*)thr; 85 jt->dirty_card_queue().enqueue(byte); 86 } else { 87 MutexLockerEx x(Shared_DirtyCardQ_lock, 88 Mutex::_no_safepoint_check_flag); 89 _dcqs.shared_dirty_card_queue()->enqueue(byte); 90 } 91 } 92 } 93 94 void 95 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field, 96 oop new_val) { 97 uintptr_t field_uint = (uintptr_t)field; 98 uintptr_t new_val_uint = (uintptr_t)new_val; 99 uintptr_t comb = field_uint ^ new_val_uint; 100 comb = comb >> HeapRegion::LogOfHRGrainBytes; 101 if (comb == 0) return; 102 if (new_val == NULL) return; 103 // Otherwise, log it. 104 G1SATBCardTableLoggingModRefBS* g1_bs = 105 (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set(); 106 g1_bs->write_ref_field_work(field, new_val); 107 } 108 109 void 110 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) { 111 jbyte* byte = byte_for(mr.start()); 112 jbyte* last_byte = byte_for(mr.last()); 113 Thread* thr = Thread::current(); 114 if (whole_heap) { 115 while (byte <= last_byte) { 116 *byte = dirty_card; 117 byte++; 118 } 119 } else { 120 // Enqueue if necessary. 121 if (thr->is_Java_thread()) { 122 JavaThread* jt = (JavaThread*)thr; 123 while (byte <= last_byte) { 124 if (*byte != dirty_card) { 125 *byte = dirty_card; 126 jt->dirty_card_queue().enqueue(byte); 127 } 128 byte++; 129 } 130 } else { 131 MutexLockerEx x(Shared_DirtyCardQ_lock, 132 Mutex::_no_safepoint_check_flag); 133 while (byte <= last_byte) { 134 if (*byte != dirty_card) { 135 *byte = dirty_card; 136 _dcqs.shared_dirty_card_queue()->enqueue(byte); 137 } 138 byte++; 139 } 140 } 141 } 142 }