1 /*
2 * Copyright (c) 1997, 2016, 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 *
33
34 // An InstanceRefKlass is a specialized InstanceKlass for Java
35 // classes that are subclasses of java/lang/ref/Reference.
36 //
37 // These classes are used to implement soft/weak/final/phantom
38 // references and finalization, and need special treatment by the
39 // garbage collector.
40 //
41 // During GC discovered reference objects are added (chained) to one
42 // of the four lists below, depending on the type of reference.
43 // The linked occurs through the next field in class java/lang/ref/Reference.
44 //
45 // Afterwards, the discovered references are processed in decreasing
46 // order of reachability. Reference objects eligible for notification
47 // are linked to the static pending_list in class java/lang/ref/Reference,
48 // and the pending list lock object in the same class is notified.
49
50
51 class InstanceRefKlass: public InstanceKlass {
52 friend class InstanceKlass;
53 template <bool nv, typename T, class OopClosureType, class Contains>
54 friend class InstanceRefKlassSpecialized;
55 private:
56 InstanceRefKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_reference) {}
57
58 public:
59 InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
60
61 // GC specific object visitors
62 //
63 #if INCLUDE_ALL_GCS
64 // Parallel Scavenge
65 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
66 // Parallel Compact
67 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
68 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
69 #endif
70
71 // Oop fields (and metadata) iterators
72 // [nv = true] Use non-virtual calls to do_oop_nv.
73 // [nv = false] Use virtual calls to do_oop.
74 //
103 template <bool nv, class OopClosureType>
104 inline void oop_oop_iterate_ref_processing_bounded(oop obj, OopClosureType* closure, MemRegion mr);
105
106 // Reference processing
107 template <bool nv, class OopClosureType>
108 inline void oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure);
109
110 // Building blocks for specialized handling.
111 template <bool nv, typename T, class OopClosureType, class Contains>
112 static void do_referent(oop obj, OopClosureType* closure, Contains& contains);
113
114 template <bool nv, typename T, class OopClosureType, class Contains>
115 static void do_next(oop obj, OopClosureType* closure, Contains& contains);
116
117 template <bool nv, typename T, class OopClosureType, class Contains>
118 static void do_discovered(oop obj, OopClosureType* closure, Contains& contains);
119
120 template <typename T, class OopClosureType>
121 static bool try_discover(oop obj, ReferenceType type, OopClosureType* closure);
122
123 // Default way of handling instance ref klasses, does reference
124 // processing if a ReferenceProcessor has been supplied.
125 template <bool nv, typename T, class OopClosureType, class Contains>
126 static void oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains);
127
128 // Just handle the fields, don't care about reference processing.
129 template <bool nv, typename T, class OopClosureType, class Contains>
130 static void oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains);
131
132 #ifdef ASSERT
133 template <typename T>
134 static void trace_reference_gc(const char *s, oop obj, T* referent_addr, T* next_addr, T* discovered_addr);
135 #endif
136
137 public:
138
139 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
140 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
141
142 #if INCLUDE_ALL_GCS
143 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
144 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
145 #endif // INCLUDE_ALL_GCS
146
147 // Update non-static oop maps so 'referent', 'nextPending' and
148 // 'discovered' will look like non-oops
149 static void update_nonstatic_oop_maps(Klass* k);
150
151 public:
152 // Verification
153 void oop_verify_on(oop obj, outputStream* st);
154 };
155
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1 /*
2 * Copyright (c) 1997, 2017, 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 *
33
34 // An InstanceRefKlass is a specialized InstanceKlass for Java
35 // classes that are subclasses of java/lang/ref/Reference.
36 //
37 // These classes are used to implement soft/weak/final/phantom
38 // references and finalization, and need special treatment by the
39 // garbage collector.
40 //
41 // During GC discovered reference objects are added (chained) to one
42 // of the four lists below, depending on the type of reference.
43 // The linked occurs through the next field in class java/lang/ref/Reference.
44 //
45 // Afterwards, the discovered references are processed in decreasing
46 // order of reachability. Reference objects eligible for notification
47 // are linked to the static pending_list in class java/lang/ref/Reference,
48 // and the pending list lock object in the same class is notified.
49
50
51 class InstanceRefKlass: public InstanceKlass {
52 friend class InstanceKlass;
53 private:
54 InstanceRefKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_reference) {}
55
56 public:
57 InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
58
59 // GC specific object visitors
60 //
61 #if INCLUDE_ALL_GCS
62 // Parallel Scavenge
63 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
64 // Parallel Compact
65 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
66 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
67 #endif
68
69 // Oop fields (and metadata) iterators
70 // [nv = true] Use non-virtual calls to do_oop_nv.
71 // [nv = false] Use virtual calls to do_oop.
72 //
101 template <bool nv, class OopClosureType>
102 inline void oop_oop_iterate_ref_processing_bounded(oop obj, OopClosureType* closure, MemRegion mr);
103
104 // Reference processing
105 template <bool nv, class OopClosureType>
106 inline void oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure);
107
108 // Building blocks for specialized handling.
109 template <bool nv, typename T, class OopClosureType, class Contains>
110 static void do_referent(oop obj, OopClosureType* closure, Contains& contains);
111
112 template <bool nv, typename T, class OopClosureType, class Contains>
113 static void do_next(oop obj, OopClosureType* closure, Contains& contains);
114
115 template <bool nv, typename T, class OopClosureType, class Contains>
116 static void do_discovered(oop obj, OopClosureType* closure, Contains& contains);
117
118 template <typename T, class OopClosureType>
119 static bool try_discover(oop obj, ReferenceType type, OopClosureType* closure);
120
121 // Do discovery while handling instance ref klasses, does reference
122 // processing only if a ReferenceProcessor has been supplied.
123 template <bool nv, typename T, class OopClosureType, class Contains>
124 static void oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains);
125
126 // Handle the fields, don't care about reference processing.
127 template <bool nv, typename T, class OopClosureType, class Contains>
128 static void oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains);
129
130 template <typename T>
131 static void trace_reference_gc(const char *s, oop obj, T* referent_addr, T* next_addr, T* discovered_addr) NOT_DEBUG_RETURN;
132
133 public:
134
135 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
136 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
137
138 #if INCLUDE_ALL_GCS
139 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
140 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
141 #endif // INCLUDE_ALL_GCS
142
143 // Update non-static oop maps so 'referent', 'nextPending' and
144 // 'discovered' will look like non-oops
145 static void update_nonstatic_oop_maps(Klass* k);
146
147 public:
148 // Verification
149 void oop_verify_on(oop obj, outputStream* st);
150 };
151
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