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.
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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 "gc/shenandoah/shenandoahMark.inline.hpp"
38 #include "gc/shenandoah/shenandoahReferenceProcessor.hpp"
39 #include "gc/shenandoah/shenandoahTaskqueue.inline.hpp"
40 #include "memory/iterator.inline.hpp"
41 #include "oops/compressedOops.inline.hpp"
42 #include "runtime/atomic.hpp"
43 #include "runtime/javaThread.hpp"
44
45 //
46 // ========= Super
47 //
48
49 ShenandoahSuperClosure::ShenandoahSuperClosure() :
50 MetadataVisitingOopIterateClosure(), _heap(ShenandoahHeap::heap()) {}
51
52 ShenandoahSuperClosure::ShenandoahSuperClosure(ShenandoahReferenceProcessor* rp) :
53 MetadataVisitingOopIterateClosure(rp), _heap(ShenandoahHeap::heap()) {}
54
55 void ShenandoahSuperClosure::do_nmethod(nmethod* nm) {
56 nm->run_nmethod_entry_barrier();
57 }
58
59 //
60 // ========= Marking
61 //
62
63 ShenandoahMarkRefsSuperClosure::ShenandoahMarkRefsSuperClosure(ShenandoahObjToScanQueue* q,
64 ShenandoahReferenceProcessor* rp,
65 ShenandoahObjToScanQueue* old_q) :
66 ShenandoahSuperClosure(rp),
67 _queue(q),
68 _old_queue(old_q),
69 _mark_context(ShenandoahHeap::heap()->marking_context()),
70 _weak(false) {}
71
72 template<class T, ShenandoahGenerationType GENERATION>
73 inline void ShenandoahMarkRefsSuperClosure::work(T* p) {
74 ShenandoahMark::mark_through_ref<T, GENERATION>(p, _queue, _old_queue, _mark_context, _weak);
75 }
76
77 ShenandoahForwardedIsAliveClosure::ShenandoahForwardedIsAliveClosure() :
78 _mark_context(ShenandoahHeap::heap()->marking_context()) {}
79
80 bool ShenandoahForwardedIsAliveClosure::do_object_b(oop obj) {
81 if (CompressedOops::is_null(obj)) {
82 return false;
83 }
84 obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
85 shenandoah_assert_not_forwarded_if(nullptr, obj, ShenandoahHeap::heap()->is_concurrent_mark_in_progress());
86 return _mark_context->is_marked_or_old(obj);
87 }
88
89 ShenandoahIsAliveClosure::ShenandoahIsAliveClosure() :
90 _mark_context(ShenandoahHeap::heap()->marking_context()) {}
91
92 bool ShenandoahIsAliveClosure::do_object_b(oop obj) {
93 if (CompressedOops::is_null(obj)) {
94 return false;
95 }
96 shenandoah_assert_not_forwarded(nullptr, obj);
97 return _mark_context->is_marked_or_old(obj);
98 }
99
100 BoolObjectClosure* ShenandoahIsAliveSelector::is_alive_closure() {
101 return ShenandoahHeap::heap()->has_forwarded_objects() ?
102 reinterpret_cast<BoolObjectClosure*>(&_fwd_alive_cl) :
103 reinterpret_cast<BoolObjectClosure*>(&_alive_cl);
104 }
105
106 ShenandoahKeepAliveClosure::ShenandoahKeepAliveClosure() :
107 _bs(ShenandoahBarrierSet::barrier_set()) {}
108
109 template <typename T>
110 void ShenandoahKeepAliveClosure::do_oop_work(T* p) {
111 assert(ShenandoahHeap::heap()->is_concurrent_mark_in_progress(), "Only for concurrent marking phase");
112 assert(ShenandoahHeap::heap()->is_concurrent_old_mark_in_progress() || !ShenandoahHeap::heap()->has_forwarded_objects(), "Not expected");
113
114 T o = RawAccess<>::oop_load(p);
115 if (!CompressedOops::is_null(o)) {
116 oop obj = CompressedOops::decode_not_null(o);
117 _bs->enqueue(obj);
118 }
119 }
120
121
122 //
123 // ========= Evacuating + Roots
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 CONCURRENT, bool STABLE_THREAD>
147 template <class T>
148 void ShenandoahEvacuateUpdateRootClosureBase<CONCURRENT, 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 (CONCURRENT) {
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 ShenandoahNMethodAndDisarmClosure::ShenandoahNMethodAndDisarmClosure(OopClosure* cl) :
205 NMethodToOopClosure(cl, true /* fix_relocations */),
206 _bs(BarrierSet::barrier_set()->barrier_set_nmethod()) {
207 }
208
209 void ShenandoahNMethodAndDisarmClosure::do_nmethod(nmethod* nm) {
210 assert(nm != nullptr, "Sanity");
211 assert(!ShenandoahNMethod::gc_data(nm)->is_unregistered(), "Should not be here");
212 NMethodToOopClosure::do_nmethod(nm);
213 _bs->disarm(nm);
214 }
215
216
217 //
218 // ========= Update References
219 //
220
221 template <ShenandoahGenerationType GENERATION>
222 ShenandoahMarkUpdateRefsClosure<GENERATION>::ShenandoahMarkUpdateRefsClosure(ShenandoahObjToScanQueue* q,
223 ShenandoahReferenceProcessor* rp,
224 ShenandoahObjToScanQueue* old_q) :
225 ShenandoahMarkRefsSuperClosure(q, rp, old_q) {
226 assert(_heap->is_stw_gc_in_progress(), "Can only be used for STW GC");
227 }
228
229 template<ShenandoahGenerationType GENERATION>
230 template<class T>
231 inline void ShenandoahMarkUpdateRefsClosure<GENERATION>::work(T* p) {
232 // Update the location
233 _heap->non_conc_update_with_forwarded(p);
234
235 // ...then do the usual thing
236 ShenandoahMarkRefsSuperClosure::work<T, GENERATION>(p);
237 }
238
239 template<class T>
240 inline void ShenandoahNonConcUpdateRefsClosure::work(T* p) {
241 _heap->non_conc_update_with_forwarded(p);
242 }
243
244 template<class T>
245 inline void ShenandoahConcUpdateRefsClosure::work(T* p) {
246 _heap->conc_update_with_forwarded(p);
247 }
248
249
250 //
251 // ========= Utilities
252 //
253
254 #ifdef ASSERT
255 template <class T>
256 void ShenandoahAssertNotForwardedClosure::do_oop_work(T* p) {
257 T o = RawAccess<>::oop_load(p);
258 if (!CompressedOops::is_null(o)) {
259 oop obj = CompressedOops::decode_not_null(o);
260 shenandoah_assert_not_forwarded(p, obj);
261 }
262 }
263
264 void ShenandoahAssertNotForwardedClosure::do_oop(narrowOop* p) { do_oop_work(p); }
265 void ShenandoahAssertNotForwardedClosure::do_oop(oop* p) { do_oop_work(p); }
266 #endif
267
268 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCLOSURES_INLINE_HPP