1 /*
2 * Copyright (c) 2019, 2020, 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 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHCLOSURES_INLINE_HPP
25 #define SHARE_GC_SHENANDOAH_SHENANDOAHCLOSURES_INLINE_HPP
26
27 #include "gc/shenandoah/shenandoahClosures.hpp"
28
29 #include "gc/shared/barrierSetNMethod.hpp"
30 #include "gc/shenandoah/shenandoahAsserts.hpp"
31 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
32 #include "gc/shenandoah/shenandoahEvacOOMHandler.inline.hpp"
33 #include "gc/shenandoah/shenandoahMarkingContext.inline.hpp"
34 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
35 #include "gc/shenandoah/shenandoahNMethod.inline.hpp"
36 #include "gc/shenandoah/shenandoahMark.inline.hpp"
37 #include "gc/shenandoah/shenandoahReferenceProcessor.hpp"
38 #include "gc/shenandoah/shenandoahTaskqueue.inline.hpp"
39 #include "memory/iterator.inline.hpp"
40 #include "oops/compressedOops.inline.hpp"
41 #include "runtime/atomic.hpp"
42 #include "runtime/javaThread.hpp"
43
44 //
45 // ========= Super
46 //
47
48 ShenandoahSuperClosure::ShenandoahSuperClosure() :
49 MetadataVisitingOopIterateClosure(), _heap(ShenandoahHeap::heap()) {}
50
51 ShenandoahSuperClosure::ShenandoahSuperClosure(ShenandoahReferenceProcessor* rp) :
52 MetadataVisitingOopIterateClosure(rp), _heap(ShenandoahHeap::heap()) {}
53
54 void ShenandoahSuperClosure::do_nmethod(nmethod* nm) {
55 nm->run_nmethod_entry_barrier();
56 }
57
58 //
59 // ========= Marking
60 //
61
62 ShenandoahMarkRefsSuperClosure::ShenandoahMarkRefsSuperClosure(ShenandoahObjToScanQueue* q, ShenandoahReferenceProcessor* rp) :
63 ShenandoahSuperClosure(rp),
64 _queue(q),
65 _mark_context(ShenandoahHeap::heap()->marking_context()),
66 _weak(false) {}
67
68 template<class T, ShenandoahGenerationType GENERATION>
69 inline void ShenandoahMarkRefsSuperClosure::work(T* p) {
70 ShenandoahMark::mark_through_ref<T, GENERATION>(p, _queue, _mark_context, _weak);
71 }
72
73 ShenandoahForwardedIsAliveClosure::ShenandoahForwardedIsAliveClosure() :
74 _mark_context(ShenandoahHeap::heap()->marking_context()) {}
75
76 bool ShenandoahForwardedIsAliveClosure::do_object_b(oop obj) {
77 if (CompressedOops::is_null(obj)) {
78 return false;
79 }
80 obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
81 shenandoah_assert_not_forwarded_if(nullptr, obj, ShenandoahHeap::heap()->is_concurrent_mark_in_progress());
82 return _mark_context->is_marked(obj);
83 }
84
85 ShenandoahIsAliveClosure::ShenandoahIsAliveClosure() :
86 _mark_context(ShenandoahHeap::heap()->marking_context()) {}
87
88 bool ShenandoahIsAliveClosure::do_object_b(oop obj) {
89 if (CompressedOops::is_null(obj)) {
90 return false;
91 }
92 shenandoah_assert_not_forwarded(nullptr, obj);
93 return _mark_context->is_marked(obj);
94 }
95
96 BoolObjectClosure* ShenandoahIsAliveSelector::is_alive_closure() {
97 return ShenandoahHeap::heap()->has_forwarded_objects() ?
98 reinterpret_cast<BoolObjectClosure*>(&_fwd_alive_cl) :
99 reinterpret_cast<BoolObjectClosure*>(&_alive_cl);
100 }
101
102 ShenandoahKeepAliveClosure::ShenandoahKeepAliveClosure() :
103 _bs(ShenandoahBarrierSet::barrier_set()) {}
104
105 template <typename T>
106 void ShenandoahKeepAliveClosure::do_oop_work(T* p) {
107 assert(ShenandoahHeap::heap()->is_concurrent_mark_in_progress(), "Only for concurrent marking phase");
108 assert(!ShenandoahHeap::heap()->has_forwarded_objects(), "Not expected");
109
110 T o = RawAccess<>::oop_load(p);
111 if (!CompressedOops::is_null(o)) {
112 oop obj = CompressedOops::decode_not_null(o);
113 _bs->enqueue(obj);
114 }
115 }
116
117
118 //
119 // ========= Evacuating + Roots
120 //
121
122 template <bool CONCURRENT, bool STABLE_THREAD>
123 void ShenandoahEvacuateUpdateRootClosureBase<CONCURRENT, STABLE_THREAD>::do_oop(oop* p) {
124 if (CONCURRENT) {
125 ShenandoahEvacOOMScope scope;
126 do_oop_work(p);
127 } else {
128 do_oop_work(p);
129 }
130 }
131
132 template <bool CONCURRENT, bool STABLE_THREAD>
133 void ShenandoahEvacuateUpdateRootClosureBase<CONCURRENT, STABLE_THREAD>::do_oop(narrowOop* p) {
134 if (CONCURRENT) {
135 ShenandoahEvacOOMScope scope;
136 do_oop_work(p);
137 } else {
138 do_oop_work(p);
139 }
140 }
141
142 template <bool CONCURRENT, bool STABLE_THREAD>
143 template <class T>
144 void ShenandoahEvacuateUpdateRootClosureBase<CONCURRENT, STABLE_THREAD>::do_oop_work(T* p) {
145 assert(_heap->is_concurrent_weak_root_in_progress() ||
146 _heap->is_concurrent_strong_root_in_progress(),
147 "Only do this in root processing phase");
148
149 T o = RawAccess<>::oop_load(p);
150 if (!CompressedOops::is_null(o)) {
151 oop obj = CompressedOops::decode_not_null(o);
152 if (_heap->in_collection_set(obj)) {
153 assert(_heap->is_evacuation_in_progress(), "Only do this when evacuation is in progress");
154 shenandoah_assert_marked(p, obj);
155 oop resolved = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
156 if (resolved == obj) {
157 Thread* thr = STABLE_THREAD ? _thread : Thread::current();
158 assert(thr == Thread::current(), "Wrong thread");
159
160 resolved = _heap->evacuate_object(obj, thr);
161 }
162 if (CONCURRENT) {
163 ShenandoahHeap::atomic_update_oop(resolved, p, o);
164 } else {
165 RawAccess<IS_NOT_NULL | MO_UNORDERED>::oop_store(p, resolved);
166 }
167 }
168 }
169 }
170
171 template <bool CONCURRENT, typename IsAlive, typename KeepAlive>
172 ShenandoahCleanUpdateWeakOopsClosure<CONCURRENT, IsAlive, KeepAlive>::ShenandoahCleanUpdateWeakOopsClosure(IsAlive* is_alive, KeepAlive* keep_alive) :
173 _is_alive(is_alive), _keep_alive(keep_alive) {
174 if (!CONCURRENT) {
175 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
176 }
177 }
178
179 template <bool CONCURRENT, typename IsAlive, typename KeepAlive>
180 void ShenandoahCleanUpdateWeakOopsClosure<CONCURRENT, IsAlive, KeepAlive>::do_oop(oop* p) {
181 oop obj = RawAccess<>::oop_load(p);
182 if (!CompressedOops::is_null(obj)) {
183 if (_is_alive->do_object_b(obj)) {
184 _keep_alive->do_oop(p);
185 } else {
186 if (CONCURRENT) {
187 ShenandoahHeap::atomic_clear_oop(p, obj);
188 } else {
189 RawAccess<IS_NOT_NULL>::oop_store(p, oop());
190 }
191 }
192 }
193 }
194
195 template <bool CONCURRENT, typename IsAlive, typename KeepAlive>
196 void ShenandoahCleanUpdateWeakOopsClosure<CONCURRENT, IsAlive, KeepAlive>::do_oop(narrowOop* p) {
197 ShouldNotReachHere();
198 }
199
200 ShenandoahNMethodAndDisarmClosure::ShenandoahNMethodAndDisarmClosure(OopClosure* cl) :
201 NMethodToOopClosure(cl, true /* fix_relocations */),
202 _bs(BarrierSet::barrier_set()->barrier_set_nmethod()) {
203 }
204
205 void ShenandoahNMethodAndDisarmClosure::do_nmethod(nmethod* nm) {
206 assert(nm != nullptr, "Sanity");
207 assert(!ShenandoahNMethod::gc_data(nm)->is_unregistered(), "Should not be here");
208 NMethodToOopClosure::do_nmethod(nm);
209 _bs->disarm(nm);
210 }
211
212
213 //
214 // ========= Update References
215 //
216
217 template <ShenandoahGenerationType GENERATION>
218 ShenandoahMarkUpdateRefsClosure<GENERATION>::ShenandoahMarkUpdateRefsClosure(ShenandoahObjToScanQueue* q, ShenandoahReferenceProcessor* rp) :
219 ShenandoahMarkRefsSuperClosure(q, rp) {
220 assert(_heap->is_stw_gc_in_progress(), "Can only be used for STW GC");
221 }
222
223 template<ShenandoahGenerationType GENERATION>
224 template<class T>
225 inline void ShenandoahMarkUpdateRefsClosure<GENERATION>::work(T* p) {
226 // Update the location
227 _heap->non_conc_update_with_forwarded(p);
228
229 // ...then do the usual thing
230 ShenandoahMarkRefsSuperClosure::work<T, GENERATION>(p);
231 }
232
233 template<class T>
234 inline void ShenandoahNonConcUpdateRefsClosure::work(T* p) {
235 _heap->non_conc_update_with_forwarded(p);
236 }
237
238 template<class T>
239 inline void ShenandoahConcUpdateRefsClosure::work(T* p) {
240 _heap->conc_update_with_forwarded(p);
241 }
242
243
244 //
245 // ========= Utilities
246 //
247
248 #ifdef ASSERT
249 template <class T>
250 void ShenandoahAssertNotForwardedClosure::do_oop_work(T* p) {
251 T o = RawAccess<>::oop_load(p);
252 if (!CompressedOops::is_null(o)) {
253 oop obj = CompressedOops::decode_not_null(o);
254 shenandoah_assert_not_forwarded(p, obj);
255 }
256 }
257
258 void ShenandoahAssertNotForwardedClosure::do_oop(narrowOop* p) { do_oop_work(p); }
259 void ShenandoahAssertNotForwardedClosure::do_oop(oop* p) { do_oop_work(p); }
260 #endif
261
262 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCLOSURES_INLINE_HPP