1 /*
2 * Copyright (c) 2010, 2019, Oracle and/or its affiliates. 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_PARALLEL_PSCOMPACTIONMANAGER_INLINE_HPP
26 #define SHARE_GC_PARALLEL_PSCOMPACTIONMANAGER_INLINE_HPP
27
28 #include "classfile/javaClasses.inline.hpp"
29 #include "gc/parallel/parMarkBitMap.hpp"
30 #include "gc/parallel/psCompactionManager.hpp"
31 #include "gc/parallel/psParallelCompact.inline.hpp"
32 #include "gc/shared/taskqueue.inline.hpp"
33 #include "oops/access.inline.hpp"
34 #include "oops/arrayOop.inline.hpp"
35 #include "oops/compressedOops.inline.hpp"
36 #include "oops/objArrayOop.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "utilities/debug.hpp"
39 #include "utilities/globalDefinitions.hpp"
40
41 class PCMarkAndPushClosure: public OopClosure {
42 private:
43 ParCompactionManager* _compaction_manager;
44 public:
45 PCMarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { }
46
47 template <typename T> void do_oop_nv(T* p) { _compaction_manager->mark_and_push(p); }
48 virtual void do_oop(oop* p) { do_oop_nv(p); }
49 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
50
51 // This closure provides its own oop verification code.
52 debug_only(virtual bool should_verify_oops() { return false; })
53 };
54
55 class PCIterateMarkAndPushClosure: public MetadataVisitingOopIterateClosure {
56 private:
57 ParCompactionManager* _compaction_manager;
58 public:
59 PCIterateMarkAndPushClosure(ParCompactionManager* cm, ReferenceProcessor* rp) : MetadataVisitingOopIterateClosure(rp), _compaction_manager(cm) { }
60
61 template <typename T> void do_oop_nv(T* p) { _compaction_manager->mark_and_push(p); }
62 virtual void do_oop(oop* p) { do_oop_nv(p); }
63 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
64
65 void do_klass_nv(Klass* k) { _compaction_manager->follow_klass(k); }
66 void do_cld_nv(ClassLoaderData* cld) { _compaction_manager->follow_class_loader(cld); }
67
68 // This closure provides its own oop verification code.
69 debug_only(virtual bool should_verify_oops() { return false; })
70 };
71
72 inline bool ParCompactionManager::steal(int queue_num, oop& t) {
73 return oop_task_queues()->steal(queue_num, t);
74 }
75
76 inline bool ParCompactionManager::steal_objarray(int queue_num, ObjArrayTask& t) {
77 return _objarray_task_queues->steal(queue_num, t);
78 }
79
80 inline bool ParCompactionManager::steal(int queue_num, size_t& region) {
81 return region_task_queues()->steal(queue_num, region);
82 }
83
84 inline void ParCompactionManager::push(oop obj) {
85 _marking_stack.push(obj);
86 }
87
88 void ParCompactionManager::push_objarray(oop obj, size_t index)
89 {
90 ObjArrayTask task(obj, index);
91 assert(task.is_valid(), "bad ObjArrayTask");
92 _objarray_stack.push(task);
93 }
94
95 void ParCompactionManager::push_region(size_t index)
96 {
97 #ifdef ASSERT
98 const ParallelCompactData& sd = PSParallelCompact::summary_data();
99 ParallelCompactData::RegionData* const region_ptr = sd.region(index);
100 assert(region_ptr->claimed(), "must be claimed");
101 assert(region_ptr->_pushed++ == 0, "should only be pushed once");
102 #endif
103 region_stack()->push(index);
104 }
105
106 template <typename T>
107 inline void ParCompactionManager::mark_and_push(T* p) {
108 T heap_oop = RawAccess<>::oop_load(p);
109 if (!CompressedOops::is_null(heap_oop)) {
110 oop obj = CompressedOops::decode_not_null(heap_oop);
111 assert(ParallelScavengeHeap::heap()->is_in(obj), "should be in heap");
112
113 if (mark_bitmap()->is_unmarked(obj) && PSParallelCompact::mark_obj(obj)) {
114 push(obj);
115 }
116 }
117 }
118
119 inline void ParCompactionManager::follow_klass(Klass* klass) {
120 oop holder = klass->class_loader_data()->holder_no_keepalive();
121 mark_and_push(&holder);
122 }
123
124 inline void ParCompactionManager::FollowStackClosure::do_void() {
125 _compaction_manager->follow_marking_stacks();
126 }
127
128 template <typename T>
129 inline void follow_array_specialized(objArrayOop obj, int index, ParCompactionManager* cm) {
130 const size_t len = size_t(obj->length());
131 const size_t beg_index = size_t(index);
132 assert(beg_index < len || len == 0, "index too large");
133
134 const size_t stride = MIN2(len - beg_index, (size_t)ObjArrayMarkingStride);
135 const size_t end_index = beg_index + stride;
136 T* const base = (T*)obj->base_raw();
137 T* const beg = base + beg_index;
138 T* const end = base + end_index;
139
140 if (end_index < len) {
141 cm->push_objarray(obj, end_index); // Push the continuation.
142 }
143
144 // Push the non-NULL elements of the next stride on the marking stack.
145 for (T* e = beg; e < end; e++) {
146 cm->mark_and_push<T>(e);
147 }
148 }
149
150 inline void ParCompactionManager::follow_array(objArrayOop obj, int index) {
151 if (UseCompressedOops) {
152 follow_array_specialized<narrowOop>(obj, index, this);
153 } else {
154 follow_array_specialized<oop>(obj, index, this);
155 }
156 }
157
158 inline void ParCompactionManager::update_contents(oop obj) {
159 if (!obj->klass()->is_typeArray_klass()) {
160 PCAdjustPointerClosure apc(this);
161 obj->oop_iterate(&apc);
162 }
163 }
164
165 inline void ParCompactionManager::follow_class_loader(ClassLoaderData* cld) {
166 PCMarkAndPushClosure mark_and_push_closure(this);
167 cld->oops_do(&mark_and_push_closure, true);
168 }
169
170 inline void ParCompactionManager::follow_contents(oop obj) {
171 assert(PSParallelCompact::mark_bitmap()->is_marked(obj), "should be marked");
172 if (obj->is_objArray()) {
173 follow_array(objArrayOop(obj), 0);
174 } else {
175 PCIterateMarkAndPushClosure cl(this, PSParallelCompact::ref_processor());
176 obj->oop_iterate(&cl);
177 }
178 }
179
180 #endif // SHARE_GC_PARALLEL_PSCOMPACTIONMANAGER_INLINE_HPP