1 /*
2 * Copyright (c) 2015, 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 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHOOPCLOSURES_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHOOPCLOSURES_HPP
27
28 #include "gc/shared/stringdedup/stringDedup.hpp"
29 #include "gc/shenandoah/shenandoahClosures.inline.hpp"
30 #include "gc/shenandoah/shenandoahGenerationType.hpp"
31 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
32 #include "gc/shenandoah/shenandoahTaskqueue.hpp"
33 #include "gc/shenandoah/shenandoahUtils.hpp"
34 #include "memory/iterator.hpp"
35 #include "runtime/javaThread.hpp"
36
37 class ShenandoahMarkRefsSuperClosure : public MetadataVisitingOopIterateClosure {
38 private:
39 ShenandoahObjToScanQueue* _queue;
40 ShenandoahMarkingContext* const _mark_context;
41 bool _weak;
42
43 protected:
44 template <class T, ShenandoahGenerationType GENERATION>
45 void work(T *p);
46
47 public:
48 ShenandoahMarkRefsSuperClosure(ShenandoahObjToScanQueue* q, ShenandoahReferenceProcessor* rp);
49
50 bool is_weak() const {
51 return _weak;
52 }
53
54 void set_weak(bool weak) {
55 _weak = weak;
56 }
57
58 virtual void do_nmethod(nmethod* nm) {
59 assert(!is_weak(), "Can't handle weak marking of nmethods");
60 nm->run_nmethod_entry_barrier();
61 }
62 };
63
64 class ShenandoahMarkUpdateRefsSuperClosure : public ShenandoahMarkRefsSuperClosure {
65 protected:
66 ShenandoahHeap* const _heap;
67
68 template <class T, ShenandoahGenerationType GENERATION>
69 inline void work(T* p);
70
71 public:
72 ShenandoahMarkUpdateRefsSuperClosure(ShenandoahObjToScanQueue* q, ShenandoahReferenceProcessor* rp) :
73 ShenandoahMarkRefsSuperClosure(q, rp),
74 _heap(ShenandoahHeap::heap()) {
75 assert(_heap->is_stw_gc_in_progress(), "Can only be used for STW GC");
76 };
77 };
78
79 template <ShenandoahGenerationType GENERATION>
80 class ShenandoahMarkUpdateRefsClosure : public ShenandoahMarkUpdateRefsSuperClosure {
81 private:
82 template <class T>
83 inline void do_oop_work(T* p) { work<T, GENERATION>(p); }
84
85 public:
86 ShenandoahMarkUpdateRefsClosure(ShenandoahObjToScanQueue* q, ShenandoahReferenceProcessor* rp) :
87 ShenandoahMarkUpdateRefsSuperClosure(q, rp) {}
88
89 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
90 virtual void do_oop(oop* p) { do_oop_work(p); }
91 };
92
93 template <ShenandoahGenerationType GENERATION>
94 class ShenandoahMarkRefsClosure : public ShenandoahMarkRefsSuperClosure {
95 private:
96 template <class T>
97 inline void do_oop_work(T* p) { work<T, GENERATION>(p); }
98
99 public:
100 ShenandoahMarkRefsClosure(ShenandoahObjToScanQueue* q, ShenandoahReferenceProcessor* rp) :
101 ShenandoahMarkRefsSuperClosure(q, rp) {};
102
103 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
104 virtual void do_oop(oop* p) { do_oop_work(p); }
105 };
106
107
108 class ShenandoahUpdateRefsSuperClosure : public ShenandoahOopClosureBase {
109 protected:
110 ShenandoahHeap* _heap;
111
112 public:
113 ShenandoahUpdateRefsSuperClosure() : _heap(ShenandoahHeap::heap()) {}
114 };
115
116 class ShenandoahSTWUpdateRefsClosure : public ShenandoahUpdateRefsSuperClosure {
117 private:
118 template<class T>
119 inline void work(T* p);
120
121 public:
122 ShenandoahSTWUpdateRefsClosure() : ShenandoahUpdateRefsSuperClosure() {
123 assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must only be used at safepoints");
124 }
125
126 virtual void do_oop(narrowOop* p) { work(p); }
127 virtual void do_oop(oop* p) { work(p); }
128 };
129
130 class ShenandoahConcUpdateRefsClosure : public ShenandoahUpdateRefsSuperClosure {
131 private:
132 template<class T>
133 inline void work(T* p);
134
135 public:
136 ShenandoahConcUpdateRefsClosure() : ShenandoahUpdateRefsSuperClosure() {}
137
138 virtual void do_oop(narrowOop* p) { work(p); }
139 virtual void do_oop(oop* p) { work(p); }
140 };
141
142 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHOOPCLOSURES_HPP