1 /*
2 * Copyright (c) 2015, 2018, 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_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP
26 #define SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP
27
28 #include "classfile/javaClasses.inline.hpp"
29 #include "gc/shared/referenceProcessor.hpp"
30 #include "logging/log.hpp"
31 #include "oops/access.inline.hpp"
32 #include "oops/compressedOops.inline.hpp"
33 #include "oops/instanceKlass.inline.hpp"
34 #include "oops/instanceRefKlass.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "utilities/debug.hpp"
37 #include "utilities/globalDefinitions.hpp"
38 #include "utilities/macros.hpp"
39
40 template <typename T, class OopClosureType, class Contains>
41 void InstanceRefKlass::do_referent(oop obj, OopClosureType* closure, Contains& contains) {
42 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr_raw(obj);
43 if (contains(referent_addr)) {
44 Devirtualizer::do_oop(closure, referent_addr);
45 }
46 }
47
48 template <typename T, class OopClosureType, class Contains>
49 void InstanceRefKlass::do_discovered(oop obj, OopClosureType* closure, Contains& contains) {
50 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr_raw(obj);
51 if (contains(discovered_addr)) {
52 Devirtualizer::do_oop(closure, discovered_addr);
53 }
54 }
55
56 static inline oop load_referent(oop obj, ReferenceType type) {
57 if (type == REF_PHANTOM) {
58 return HeapAccess<ON_PHANTOM_OOP_REF | AS_NO_KEEPALIVE>::oop_load(java_lang_ref_Reference::referent_addr_raw(obj));
59 } else {
60 return HeapAccess<ON_WEAK_OOP_REF | AS_NO_KEEPALIVE>::oop_load(java_lang_ref_Reference::referent_addr_raw(obj));
61 }
62 }
63
64 template <typename T, class OopClosureType>
65 bool InstanceRefKlass::try_discover(oop obj, ReferenceType type, OopClosureType* closure) {
66 ReferenceDiscoverer* rd = closure->ref_discoverer();
67 if (rd != NULL) {
68 oop referent = load_referent(obj, type);
69 if (referent != NULL) {
70 if (!referent->is_gc_marked()) {
71 // Only try to discover if not yet marked.
72 return rd->discover_reference(obj, type);
73 }
74 }
75 }
76 return false;
77 }
78
79 template <typename T, class OopClosureType, class Contains>
80 void InstanceRefKlass::oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {
81 // Try to discover reference and return if it succeeds.
82 if (try_discover<T>(obj, type, closure)) {
83 return;
84 }
85
86 // Treat referent and discovered as normal oops.
87 do_referent<T>(obj, closure, contains);
88 do_discovered<T>(obj, closure, contains);
89 }
90
91 template <typename T, class OopClosureType, class Contains>
92 void InstanceRefKlass::oop_oop_iterate_discovered_and_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {
93 // Explicitly apply closure to the discovered field.
94 do_discovered<T>(obj, closure, contains);
95 // Then do normal reference processing with discovery.
96 oop_oop_iterate_discovery<T>(obj, type, closure, contains);
97 }
98
99 template <typename T, class OopClosureType, class Contains>
100 void InstanceRefKlass::oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains) {
101 do_referent<T>(obj, closure, contains);
102 do_discovered<T>(obj, closure, contains);
103 }
104
105 template <typename T, class OopClosureType, class Contains>
106 void InstanceRefKlass::oop_oop_iterate_fields_except_referent(oop obj, OopClosureType* closure, Contains& contains) {
107 do_discovered<T>(obj, closure, contains);
108 }
109
110 template <typename T, class OopClosureType, class Contains>
111 void InstanceRefKlass::oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure, Contains& contains) {
112 switch (closure->reference_iteration_mode()) {
113 case OopIterateClosure::DO_DISCOVERY:
114 trace_reference_gc<T>("do_discovery", obj);
115 oop_oop_iterate_discovery<T>(obj, reference_type(), closure, contains);
116 break;
117 case OopIterateClosure::DO_DISCOVERED_AND_DISCOVERY:
118 trace_reference_gc<T>("do_discovered_and_discovery", obj);
119 oop_oop_iterate_discovered_and_discovery<T>(obj, reference_type(), closure, contains);
120 break;
121 case OopIterateClosure::DO_FIELDS:
122 trace_reference_gc<T>("do_fields", obj);
123 oop_oop_iterate_fields<T>(obj, closure, contains);
124 break;
125 case OopIterateClosure::DO_FIELDS_EXCEPT_REFERENT:
126 trace_reference_gc<T>("do_fields_except_referent", obj);
127 oop_oop_iterate_fields_except_referent<T>(obj, closure, contains);
128 break;
129 default:
130 ShouldNotReachHere();
131 }
132 }
133
134 class AlwaysContains {
135 public:
136 template <typename T> bool operator()(T* p) const { return true; }
137 };
138
139 template <typename T, class OopClosureType>
140 void InstanceRefKlass::oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure) {
141 AlwaysContains always_contains;
142 oop_oop_iterate_ref_processing<T>(obj, closure, always_contains);
143 }
144
145 class MrContains {
146 const MemRegion _mr;
147 public:
148 MrContains(MemRegion mr) : _mr(mr) {}
149 template <typename T> bool operator()(T* p) const { return _mr.contains(p); }
150 };
151
152 template <typename T, class OopClosureType>
153 void InstanceRefKlass::oop_oop_iterate_ref_processing_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
154 const MrContains contains(mr);
155 oop_oop_iterate_ref_processing<T>(obj, closure, contains);
156 }
157
158 template <typename T, class OopClosureType>
159 void InstanceRefKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
160 InstanceKlass::oop_oop_iterate<T>(obj, closure);
161
162 oop_oop_iterate_ref_processing<T>(obj, closure);
163 }
164
165 template <typename T, class OopClosureType>
166 void InstanceRefKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {
167 InstanceKlass::oop_oop_iterate_reverse<T>(obj, closure);
168
169 oop_oop_iterate_ref_processing<T>(obj, closure);
170 }
171
172 template <typename T, class OopClosureType>
173 void InstanceRefKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
174 InstanceKlass::oop_oop_iterate_bounded<T>(obj, closure, mr);
175
176 oop_oop_iterate_ref_processing_bounded<T>(obj, closure, mr);
177 }
178
179 #ifdef ASSERT
180 template <typename T>
181 void InstanceRefKlass::trace_reference_gc(const char *s, oop obj) {
182 T* referent_addr = (T*) java_lang_ref_Reference::referent_addr_raw(obj);
183 T* discovered_addr = (T*) java_lang_ref_Reference::discovered_addr_raw(obj);
184
185 log_develop_trace(gc, ref)("InstanceRefKlass %s for obj " PTR_FORMAT, s, p2i(obj));
186 if (java_lang_ref_Reference::is_phantom(obj)) {
187 log_develop_trace(gc, ref)(" referent_addr/* " PTR_FORMAT " / " PTR_FORMAT,
188 p2i(referent_addr), p2i((oop)HeapAccess<ON_PHANTOM_OOP_REF | AS_NO_KEEPALIVE>::oop_load(referent_addr)));
189 } else {
190 log_develop_trace(gc, ref)(" referent_addr/* " PTR_FORMAT " / " PTR_FORMAT,
191 p2i(referent_addr), p2i((oop)HeapAccess<ON_WEAK_OOP_REF | AS_NO_KEEPALIVE>::oop_load(referent_addr)));
192 }
193 log_develop_trace(gc, ref)(" discovered_addr/* " PTR_FORMAT " / " PTR_FORMAT,
194 p2i(discovered_addr), p2i((oop)HeapAccess<AS_NO_KEEPALIVE>::oop_load(discovered_addr)));
195 }
196 #endif
197
198 #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP