1 /*
2 * Copyright (c) 2019, 2020, 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 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHCLOSURES_INLINE_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHCLOSURES_INLINE_HPP
27
28 #include "gc/shenandoah/shenandoahClosures.hpp"
29
30 #include "gc/shared/barrierSetNMethod.hpp"
31 #include "gc/shenandoah/shenandoahAsserts.hpp"
32 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
33 #include "gc/shenandoah/shenandoahEvacOOMHandler.inline.hpp"
34 #include "gc/shenandoah/shenandoahMarkingContext.inline.hpp"
35 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
36 #include "gc/shenandoah/shenandoahNMethod.inline.hpp"
37 #include "memory/iterator.inline.hpp"
38 #include "oops/compressedOops.inline.hpp"
39 #include "runtime/atomic.hpp"
40 #include "runtime/javaThread.hpp"
41
42 ShenandoahFlushSATBHandshakeClosure::ShenandoahFlushSATBHandshakeClosure(SATBMarkQueueSet& qset) :
43 HandshakeClosure("Shenandoah Flush SATB"),
44 _qset(qset) {}
45
46 void ShenandoahFlushSATBHandshakeClosure::do_thread(Thread* thread) {
47 _qset.flush_queue(ShenandoahThreadLocalData::satb_mark_queue(thread));
48 }
49
50 ShenandoahForwardedIsAliveClosure::ShenandoahForwardedIsAliveClosure() :
51 _mark_context(ShenandoahHeap::heap()->marking_context()) {
52 }
53
54 bool ShenandoahForwardedIsAliveClosure::do_object_b(oop obj) {
55 if (CompressedOops::is_null(obj)) {
56 return false;
57 }
58 obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
59 shenandoah_assert_not_forwarded_if(nullptr, obj, ShenandoahHeap::heap()->is_concurrent_mark_in_progress());
60 return _mark_context->is_marked_or_old(obj);
61 }
62
63 ShenandoahIsAliveClosure::ShenandoahIsAliveClosure() :
64 _mark_context(ShenandoahHeap::heap()->marking_context()) {
65 }
66
67 bool ShenandoahIsAliveClosure::do_object_b(oop obj) {
68 if (CompressedOops::is_null(obj)) {
69 return false;
70 }
71 shenandoah_assert_not_forwarded(nullptr, obj);
72 return _mark_context->is_marked_or_old(obj);
73 }
74
75 BoolObjectClosure* ShenandoahIsAliveSelector::is_alive_closure() {
76 return ShenandoahHeap::heap()->has_forwarded_objects() ?
77 reinterpret_cast<BoolObjectClosure*>(&_fwd_alive_cl) :
78 reinterpret_cast<BoolObjectClosure*>(&_alive_cl);
79 }
80
81 void ShenandoahOopClosureBase::do_nmethod(nmethod* nm) {
82 nm->run_nmethod_entry_barrier();
83 }
84
85 ShenandoahKeepAliveClosure::ShenandoahKeepAliveClosure() :
86 _bs(ShenandoahBarrierSet::barrier_set()) {
87 }
88
89 void ShenandoahKeepAliveClosure::do_oop(oop* p) {
90 do_oop_work(p);
91 }
92
93 void ShenandoahKeepAliveClosure::do_oop(narrowOop* p) {
94 do_oop_work(p);
95 }
96
97 template <typename T>
98 void ShenandoahKeepAliveClosure::do_oop_work(T* p) {
99 assert(ShenandoahHeap::heap()->is_concurrent_mark_in_progress(), "Only for concurrent marking phase");
100 assert(ShenandoahHeap::heap()->is_concurrent_old_mark_in_progress() || !ShenandoahHeap::heap()->has_forwarded_objects(), "Not expected");
101
102 T o = RawAccess<>::oop_load(p);
103 if (!CompressedOops::is_null(o)) {
104 oop obj = CompressedOops::decode_not_null(o);
105 _bs->enqueue(obj);
106 }
107 }
108
109 ShenandoahUpdateRefsClosure::ShenandoahUpdateRefsClosure() :
110 _heap(ShenandoahHeap::heap()) {
111 }
112
113 template <class T>
114 void ShenandoahUpdateRefsClosure::do_oop_work(T* p) {
115 _heap->update_with_forwarded(p);
116 }
117
118 void ShenandoahUpdateRefsClosure::do_oop(oop* p) { do_oop_work(p); }
119 void ShenandoahUpdateRefsClosure::do_oop(narrowOop* p) { do_oop_work(p); }
120
121 template <bool concurrent, bool stable_thread>
122 ShenandoahEvacuateUpdateRootClosureBase<concurrent, stable_thread>::ShenandoahEvacuateUpdateRootClosureBase() :
123 _heap(ShenandoahHeap::heap()), _thread(stable_thread ? Thread::current() : nullptr) {
124 }
125
126 template <bool concurrent, bool stable_thread>
127 void ShenandoahEvacuateUpdateRootClosureBase<concurrent, stable_thread>::do_oop(oop* p) {
128 if (concurrent) {
129 ShenandoahEvacOOMScope scope;
130 do_oop_work(p);
131 } else {
132 do_oop_work(p);
133 }
134 }
135
136 template <bool concurrent, bool stable_thread>
137 void ShenandoahEvacuateUpdateRootClosureBase<concurrent, stable_thread>::do_oop(narrowOop* p) {
138 if (concurrent) {
139 ShenandoahEvacOOMScope scope;
140 do_oop_work(p);
141 } else {
142 do_oop_work(p);
143 }
144 }
145
146 template <bool atomic, bool stable_thread>
147 template <class T>
148 void ShenandoahEvacuateUpdateRootClosureBase<atomic, stable_thread>::do_oop_work(T* p) {
149 assert(_heap->is_concurrent_weak_root_in_progress() ||
150 _heap->is_concurrent_strong_root_in_progress(),
151 "Only do this in root processing phase");
152
153 T o = RawAccess<>::oop_load(p);
154 if (!CompressedOops::is_null(o)) {
155 oop obj = CompressedOops::decode_not_null(o);
156 if (_heap->in_collection_set(obj)) {
157 assert(_heap->is_evacuation_in_progress(), "Only do this when evacuation is in progress");
158 shenandoah_assert_marked(p, obj);
159 oop resolved = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
160 if (resolved == obj) {
161 Thread* thr = stable_thread ? _thread : Thread::current();
162 assert(thr == Thread::current(), "Wrong thread");
163
164 resolved = _heap->evacuate_object(obj, thr);
165 }
166 if (atomic) {
167 ShenandoahHeap::atomic_update_oop(resolved, p, o);
168 } else {
169 RawAccess<IS_NOT_NULL | MO_UNORDERED>::oop_store(p, resolved);
170 }
171 }
172 }
173 }
174
175 template <bool CONCURRENT, typename IsAlive, typename KeepAlive>
176 ShenandoahCleanUpdateWeakOopsClosure<CONCURRENT, IsAlive, KeepAlive>::ShenandoahCleanUpdateWeakOopsClosure(IsAlive* is_alive, KeepAlive* keep_alive) :
177 _is_alive(is_alive), _keep_alive(keep_alive) {
178 if (!CONCURRENT) {
179 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
180 }
181 }
182
183 template <bool CONCURRENT, typename IsAlive, typename KeepAlive>
184 void ShenandoahCleanUpdateWeakOopsClosure<CONCURRENT, IsAlive, KeepAlive>::do_oop(oop* p) {
185 oop obj = RawAccess<>::oop_load(p);
186 if (!CompressedOops::is_null(obj)) {
187 if (_is_alive->do_object_b(obj)) {
188 _keep_alive->do_oop(p);
189 } else {
190 if (CONCURRENT) {
191 ShenandoahHeap::atomic_clear_oop(p, obj);
192 } else {
193 RawAccess<IS_NOT_NULL>::oop_store(p, oop());
194 }
195 }
196 }
197 }
198
199 template <bool CONCURRENT, typename IsAlive, typename KeepAlive>
200 void ShenandoahCleanUpdateWeakOopsClosure<CONCURRENT, IsAlive, KeepAlive>::do_oop(narrowOop* p) {
201 ShouldNotReachHere();
202 }
203
204 ShenandoahCodeBlobAndDisarmClosure::ShenandoahCodeBlobAndDisarmClosure(OopClosure* cl) :
205 CodeBlobToOopClosure(cl, true /* fix_relocations */),
206 _bs(BarrierSet::barrier_set()->barrier_set_nmethod()) {
207 }
208
209 void ShenandoahCodeBlobAndDisarmClosure::do_code_blob(CodeBlob* cb) {
210 nmethod* const nm = cb->as_nmethod_or_null();
211 if (nm != nullptr) {
212 assert(!ShenandoahNMethod::gc_data(nm)->is_unregistered(), "Should not be here");
213 CodeBlobToOopClosure::do_code_blob(cb);
214 _bs->disarm(nm);
215 }
216 }
217
218 #ifdef ASSERT
219 template <class T>
220 void ShenandoahAssertNotForwardedClosure::do_oop_work(T* p) {
221 T o = RawAccess<>::oop_load(p);
222 if (!CompressedOops::is_null(o)) {
223 oop obj = CompressedOops::decode_not_null(o);
224 shenandoah_assert_not_forwarded(p, obj);
225 }
226 }
227
228 void ShenandoahAssertNotForwardedClosure::do_oop(narrowOop* p) { do_oop_work(p); }
229 void ShenandoahAssertNotForwardedClosure::do_oop(oop* p) { do_oop_work(p); }
230 #endif
231
232 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCLOSURES_INLINE_HPP