1 /*
2 * Copyright (c) 2001, 2010, 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.hpp"
31 #ifdef TARGET_OS_FAMILY_linux
32 # include "thread_linux.inline.hpp"
33 #endif
34 #ifdef TARGET_OS_FAMILY_solaris
35 # include "thread_solaris.inline.hpp"
36 #endif
37 #ifdef TARGET_OS_FAMILY_windows
38 # include "thread_windows.inline.hpp"
39 #endif
40
41 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
42 int max_covered_regions) :
43 CardTableModRefBSForCTRS(whole_heap, max_covered_regions)
44 {
45 _kind = G1SATBCT;
46 }
47
48
49 void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
50 assert(pre_val->is_oop_or_null(true), "Error");
51 if (!JavaThread::satb_mark_queue_set().is_active()) return;
52 Thread* thr = Thread::current();
53 if (thr->is_Java_thread()) {
54 JavaThread* jt = (JavaThread*)thr;
55 jt->satb_mark_queue().enqueue(pre_val);
56 } else {
57 MutexLocker x(Shared_SATB_Q_lock);
58 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
59 }
60 }
61
62 // When we know the current java thread:
63 template <class T> void
64 G1SATBCardTableModRefBS::write_ref_field_pre_static(T* field,
65 oop new_val,
66 JavaThread* jt) {
67 if (!JavaThread::satb_mark_queue_set().is_active()) return;
68 T heap_oop = oopDesc::load_heap_oop(field);
69 if (!oopDesc::is_null(heap_oop)) {
70 oop pre_val = oopDesc::decode_heap_oop_not_null(heap_oop);
71 assert(pre_val->is_oop(true /* ignore mark word */), "Error");
72 jt->satb_mark_queue().enqueue(pre_val);
73 }
74 }
75
76 template <class T> void
77 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
78 if (!JavaThread::satb_mark_queue_set().is_active()) return;
79 T* elem_ptr = dst;
80 for (int i = 0; i < count; i++, elem_ptr++) {
81 T heap_oop = oopDesc::load_heap_oop(elem_ptr);
82 if (!oopDesc::is_null(heap_oop)) {
83 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
84 }
85 }
86 }
87
88 G1SATBCardTableLoggingModRefBS::
89 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
90 int max_covered_regions) :
91 G1SATBCardTableModRefBS(whole_heap, max_covered_regions),
92 _dcqs(JavaThread::dirty_card_queue_set())
93 {
94 _kind = G1SATBCTLogging;
95 }
96
97 void
98 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
99 oop new_val) {
100 jbyte* byte = byte_for(field);
101 if (*byte != dirty_card) {
102 *byte = dirty_card;
103 Thread* thr = Thread::current();
104 if (thr->is_Java_thread()) {
105 JavaThread* jt = (JavaThread*)thr;
106 jt->dirty_card_queue().enqueue(byte);
107 } else {
108 MutexLockerEx x(Shared_DirtyCardQ_lock,
109 Mutex::_no_safepoint_check_flag);
110 _dcqs.shared_dirty_card_queue()->enqueue(byte);
111 }
112 }
113 }
114
115 void
116 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
117 oop new_val) {
118 uintptr_t field_uint = (uintptr_t)field;
119 uintptr_t new_val_uint = (uintptr_t)new_val;
120 uintptr_t comb = field_uint ^ new_val_uint;
121 comb = comb >> HeapRegion::LogOfHRGrainBytes;
122 if (comb == 0) return;
123 if (new_val == NULL) return;
124 // Otherwise, log it.
125 G1SATBCardTableLoggingModRefBS* g1_bs =
126 (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
127 g1_bs->write_ref_field_work(field, new_val);
128 }
129
130 void
131 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
132 jbyte* byte = byte_for(mr.start());
133 jbyte* last_byte = byte_for(mr.last());
134 Thread* thr = Thread::current();
135 if (whole_heap) {
136 while (byte <= last_byte) {
137 *byte = dirty_card;
138 byte++;
139 }
140 } else {
141 // Enqueue if necessary.
142 if (thr->is_Java_thread()) {
143 JavaThread* jt = (JavaThread*)thr;
144 while (byte <= last_byte) {
145 if (*byte != dirty_card) {
146 *byte = dirty_card;
147 jt->dirty_card_queue().enqueue(byte);
148 }
149 byte++;
150 }
151 } else {
152 MutexLockerEx x(Shared_DirtyCardQ_lock,
153 Mutex::_no_safepoint_check_flag);
154 while (byte <= last_byte) {
155 if (*byte != dirty_card) {
156 *byte = dirty_card;
157 _dcqs.shared_dirty_card_queue()->enqueue(byte);
158 }
159 byte++;
160 }
161 }
162 }
163 }