1 /*
2 * Copyright (c) 2013, 2022, Red Hat, Inc. 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/shared/barrierSetNMethod.hpp"
27 #include "gc/shenandoah/shenandoahBarrierSetClone.inline.hpp"
28 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
29 #include "gc/shenandoah/shenandoahBarrierSetNMethod.hpp"
30 #include "gc/shenandoah/shenandoahBarrierSetStackChunk.hpp"
31 #include "gc/shenandoah/shenandoahClosures.inline.hpp"
32 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
33 #include "gc/shenandoah/shenandoahStackWatermark.hpp"
34 #ifdef COMPILER1
35 #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp"
36 #endif
37 #ifdef COMPILER2
38 #include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp"
39 #endif
40
41 class ShenandoahBarrierSetC1;
42 class ShenandoahBarrierSetC2;
43
44 ShenandoahBarrierSet::ShenandoahBarrierSet(ShenandoahHeap* heap) :
45 BarrierSet(make_barrier_set_assembler<ShenandoahBarrierSetAssembler>(),
46 make_barrier_set_c1<ShenandoahBarrierSetC1>(),
47 make_barrier_set_c2<ShenandoahBarrierSetC2>(),
48 new ShenandoahBarrierSetNMethod(heap),
49 new ShenandoahBarrierSetStackChunk(),
50 BarrierSet::FakeRtti(BarrierSet::ShenandoahBarrierSet)),
51 _heap(heap),
52 _satb_mark_queue_buffer_allocator("SATB Buffer Allocator", ShenandoahSATBBufferSize),
53 _satb_mark_queue_set(&_satb_mark_queue_buffer_allocator)
54 {
55 }
56
57 ShenandoahBarrierSetAssembler* ShenandoahBarrierSet::assembler() {
58 BarrierSetAssembler* const bsa = BarrierSet::barrier_set()->barrier_set_assembler();
59 return reinterpret_cast<ShenandoahBarrierSetAssembler*>(bsa);
60 }
61
62 void ShenandoahBarrierSet::print_on(outputStream* st) const {
63 st->print("ShenandoahBarrierSet");
64 }
65
66 bool ShenandoahBarrierSet::need_load_reference_barrier(DecoratorSet decorators, BasicType type) {
67 if (!ShenandoahLoadRefBarrier) return false;
68 // Only needed for references
69 return is_reference_type(type);
70 }
71
72 bool ShenandoahBarrierSet::need_keep_alive_barrier(DecoratorSet decorators, BasicType type) {
73 if (!ShenandoahSATBBarrier) return false;
74 // Only needed for references
107 thread->set_nmethod_disarmed_guard_value(bs_nm->disarmed_guard_value());
108 }
109
110 if (ShenandoahStackWatermarkBarrier) {
111 JavaThread* const jt = JavaThread::cast(thread);
112 StackWatermark* const watermark = new ShenandoahStackWatermark(jt);
113 StackWatermarkSet::add_watermark(jt, watermark);
114 }
115 }
116 }
117
118 void ShenandoahBarrierSet::on_thread_detach(Thread *thread) {
119 SATBMarkQueue& queue = ShenandoahThreadLocalData::satb_mark_queue(thread);
120 _satb_mark_queue_set.flush_queue(queue);
121 if (thread->is_Java_thread()) {
122 PLAB* gclab = ShenandoahThreadLocalData::gclab(thread);
123 if (gclab != nullptr) {
124 gclab->retire();
125 }
126
127 // SATB protocol requires to keep alive reachable oops from roots at the beginning of GC
128 if (ShenandoahStackWatermarkBarrier) {
129 if (_heap->is_concurrent_mark_in_progress()) {
130 ShenandoahKeepAliveClosure oops;
131 StackWatermarkSet::finish_processing(JavaThread::cast(thread), &oops, StackWatermarkKind::gc);
132 } else if (_heap->is_concurrent_weak_root_in_progress() && _heap->is_evacuation_in_progress()) {
133 ShenandoahContextEvacuateUpdateRootsClosure oops;
134 StackWatermarkSet::finish_processing(JavaThread::cast(thread), &oops, StackWatermarkKind::gc);
135 }
136 }
137 }
138 }
139
140 void ShenandoahBarrierSet::clone_barrier_runtime(oop src) {
141 if (_heap->has_forwarded_objects() || (ShenandoahIUBarrier && _heap->is_concurrent_mark_in_progress())) {
142 clone_barrier(src);
143 }
144 }
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1 /*
2 * Copyright (c) 2013, 2022, Red Hat, Inc. All rights reserved.
3 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "gc/shared/barrierSetNMethod.hpp"
28 #include "gc/shenandoah/shenandoahBarrierSetClone.inline.hpp"
29 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
30 #include "gc/shenandoah/shenandoahBarrierSetNMethod.hpp"
31 #include "gc/shenandoah/shenandoahBarrierSetStackChunk.hpp"
32 #include "gc/shenandoah/shenandoahClosures.inline.hpp"
33 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
34 #include "gc/shenandoah/shenandoahScanRemembered.inline.hpp"
35 #include "gc/shenandoah/shenandoahStackWatermark.hpp"
36 #ifdef COMPILER1
37 #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp"
38 #endif
39 #ifdef COMPILER2
40 #include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp"
41 #endif
42
43 class ShenandoahBarrierSetC1;
44 class ShenandoahBarrierSetC2;
45
46 ShenandoahBarrierSet::ShenandoahBarrierSet(ShenandoahHeap* heap, MemRegion heap_region) :
47 BarrierSet(make_barrier_set_assembler<ShenandoahBarrierSetAssembler>(),
48 make_barrier_set_c1<ShenandoahBarrierSetC1>(),
49 make_barrier_set_c2<ShenandoahBarrierSetC2>(),
50 new ShenandoahBarrierSetNMethod(heap),
51 new ShenandoahBarrierSetStackChunk(),
52 BarrierSet::FakeRtti(BarrierSet::ShenandoahBarrierSet)),
53 _heap(heap),
54 _satb_mark_queue_buffer_allocator("SATB Buffer Allocator", ShenandoahSATBBufferSize),
55 _satb_mark_queue_set(&_satb_mark_queue_buffer_allocator)
56 {
57 if (ShenandoahCardBarrier) {
58 _card_table = new ShenandoahCardTable(heap_region);
59 _card_table->initialize();
60 }
61 }
62
63 ShenandoahBarrierSetAssembler* ShenandoahBarrierSet::assembler() {
64 BarrierSetAssembler* const bsa = BarrierSet::barrier_set()->barrier_set_assembler();
65 return reinterpret_cast<ShenandoahBarrierSetAssembler*>(bsa);
66 }
67
68 void ShenandoahBarrierSet::print_on(outputStream* st) const {
69 st->print("ShenandoahBarrierSet");
70 }
71
72 bool ShenandoahBarrierSet::need_load_reference_barrier(DecoratorSet decorators, BasicType type) {
73 if (!ShenandoahLoadRefBarrier) return false;
74 // Only needed for references
75 return is_reference_type(type);
76 }
77
78 bool ShenandoahBarrierSet::need_keep_alive_barrier(DecoratorSet decorators, BasicType type) {
79 if (!ShenandoahSATBBarrier) return false;
80 // Only needed for references
113 thread->set_nmethod_disarmed_guard_value(bs_nm->disarmed_guard_value());
114 }
115
116 if (ShenandoahStackWatermarkBarrier) {
117 JavaThread* const jt = JavaThread::cast(thread);
118 StackWatermark* const watermark = new ShenandoahStackWatermark(jt);
119 StackWatermarkSet::add_watermark(jt, watermark);
120 }
121 }
122 }
123
124 void ShenandoahBarrierSet::on_thread_detach(Thread *thread) {
125 SATBMarkQueue& queue = ShenandoahThreadLocalData::satb_mark_queue(thread);
126 _satb_mark_queue_set.flush_queue(queue);
127 if (thread->is_Java_thread()) {
128 PLAB* gclab = ShenandoahThreadLocalData::gclab(thread);
129 if (gclab != nullptr) {
130 gclab->retire();
131 }
132
133 PLAB* plab = ShenandoahThreadLocalData::plab(thread);
134 // CAUTION: retire_plab may register the remnant filler object with the remembered set scanner without a lock.
135 // This is safe iff it is assured that each PLAB is a whole-number multiple of card-mark memory size and each
136 // PLAB is aligned with the start of each card's memory range.
137 // TODO: Assert this in retire_plab?
138 if (plab != nullptr) {
139 ShenandoahGenerationalHeap::heap()->retire_plab(plab);
140 }
141
142 // SATB protocol requires to keep alive reachable oops from roots at the beginning of GC
143 if (ShenandoahStackWatermarkBarrier) {
144 if (_heap->is_concurrent_mark_in_progress()) {
145 ShenandoahKeepAliveClosure oops;
146 StackWatermarkSet::finish_processing(JavaThread::cast(thread), &oops, StackWatermarkKind::gc);
147 } else if (_heap->is_concurrent_weak_root_in_progress() && _heap->is_evacuation_in_progress()) {
148 ShenandoahContextEvacuateUpdateRootsClosure oops;
149 StackWatermarkSet::finish_processing(JavaThread::cast(thread), &oops, StackWatermarkKind::gc);
150 }
151 }
152 }
153 }
154
155 void ShenandoahBarrierSet::clone_barrier_runtime(oop src) {
156 if (_heap->has_forwarded_objects() || (ShenandoahIUBarrier && _heap->is_concurrent_mark_in_progress())) {
157 clone_barrier(src);
158 }
159 }
160
161 void ShenandoahBarrierSet::write_ref_array(HeapWord* start, size_t count) {
162 assert(ShenandoahCardBarrier, "Did you mean to enable ShenandoahCardBarrier?");
163
164 HeapWord* end = (HeapWord*)((char*) start + (count * heapOopSize));
165 // In the case of compressed oops, start and end may potentially be misaligned;
166 // so we need to conservatively align the first downward (this is not
167 // strictly necessary for current uses, but a case of good hygiene and,
168 // if you will, aesthetics) and the second upward (this is essential for
169 // current uses) to a HeapWord boundary, so we mark all cards overlapping
170 // this write.
171 HeapWord* aligned_start = align_down(start, HeapWordSize);
172 HeapWord* aligned_end = align_up (end, HeapWordSize);
173 // If compressed oops were not being used, these should already be aligned
174 assert(UseCompressedOops || (aligned_start == start && aligned_end == end),
175 "Expected heap word alignment of start and end");
176 _heap->card_scan()->mark_range_as_dirty(aligned_start, (aligned_end - aligned_start));
177 }
178
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