1 /*
2 * Copyright (c) 2011, 2012, 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 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "gc_implementation/shared/markSweep.inline.hpp"
29 #include "gc_interface/collectedHeap.inline.hpp"
30 #include "memory/genOopClosures.inline.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "oops/instanceKlass.hpp"
33 #include "oops/instanceClassLoaderKlass.hpp"
34 #include "oops/instanceMirrorKlass.hpp"
35 #include "oops/instanceOop.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "oops/symbol.hpp"
38 #include "runtime/handles.inline.hpp"
39 #include "utilities/macros.hpp"
40 #if INCLUDE_ALL_GCS
41 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
42 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
43 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
44 #include "oops/oop.pcgc.inline.hpp"
45 #endif // INCLUDE_ALL_GCS
46
47 #define if_do_metadata_checked(closure, nv_suffix) \
48 /* Make sure the non-virtual and the virtual versions match. */ \
49 assert(closure->do_metadata##nv_suffix() == closure->do_metadata(), \
50 "Inconsistency in do_metadata"); \
51 if (closure->do_metadata##nv_suffix())
52
53 // Macro to define InstanceClassLoaderKlass::oop_oop_iterate for virtual/nonvirtual for
54 // all closures. Macros calling macros above for each oop size.
55 // Since ClassLoader objects have only a pointer to the loader_data, they are not
56 // compressed nor does the pointer move.
57
58 #define InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)\
59 \
60 int InstanceClassLoaderKlass:: \
61 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
62 /* Get size before changing pointers */ \
63 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
64 int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
65 \
66 if_do_metadata_checked(closure, nv_suffix) { \
67 ClassLoaderData* cld = java_lang_ClassLoader::loader_data(obj); \
68 /* cld can be null if we have a non-registered class loader. */ \
69 if (cld != NULL) { \
70 closure->do_class_loader_data(cld); \
71 } \
72 } \
73 \
74 return size; \
75 }
76
77 #if INCLUDE_ALL_GCS
78 #define InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
79 \
80 int InstanceClassLoaderKlass:: \
81 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
82 /* Get size before changing pointers */ \
83 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
84 int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
85 return size; \
86 }
87 #endif // INCLUDE_ALL_GCS
88
89
90 #define InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
91 \
92 int InstanceClassLoaderKlass:: \
93 oop_oop_iterate##nv_suffix##_m(oop obj, \
94 OopClosureType* closure, \
95 MemRegion mr) { \
96 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
97 \
98 int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
99 \
100 if_do_metadata_checked(closure, nv_suffix) { \
101 if (mr.contains(obj)) { \
102 ClassLoaderData* cld = java_lang_ClassLoader::loader_data(obj); \
103 /* cld can be null if we have a non-registered class loader. */ \
104 if (cld != NULL) { \
105 closure->do_class_loader_data(cld); \
106 } \
107 } \
108 } \
109 \
110 return size; \
111 }
112
113 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN)
114 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN)
115 #if INCLUDE_ALL_GCS
116 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
117 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
118 #endif // INCLUDE_ALL_GCS
119 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m)
120 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m)
121
122 void InstanceClassLoaderKlass::oop_follow_contents(oop obj) {
123 InstanceKlass::oop_follow_contents(obj);
124 ClassLoaderData * const loader_data = java_lang_ClassLoader::loader_data(obj);
125
126 // We must NULL check here, since the class loader
127 // can be found before the loader data has been set up.
128 if(loader_data != NULL) {
129 MarkSweep::follow_class_loader(loader_data);
130 }
131 }
132
133 #if INCLUDE_ALL_GCS
134 void InstanceClassLoaderKlass::oop_follow_contents(ParCompactionManager* cm,
135 oop obj) {
136 InstanceKlass::oop_follow_contents(cm, obj);
137 ClassLoaderData * const loader_data = java_lang_ClassLoader::loader_data(obj);
138 if (loader_data != NULL) {
139 PSParallelCompact::follow_class_loader(cm, loader_data);
140 }
141 }
142
143 void InstanceClassLoaderKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
144 InstanceKlass::oop_push_contents(pm, obj);
145
146 // This is called by the young collector. It will already have taken care of
147 // all class loader data. So, we don't have to follow the class loader ->
148 // class loader data link.
149 }
150
151 int InstanceClassLoaderKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
152 InstanceKlass::oop_update_pointers(cm, obj);
153 ClassLoaderData * const loader_data = java_lang_ClassLoader::loader_data(obj);
154 if (loader_data != NULL) {
155 PSParallelCompact::adjust_class_loader(cm, loader_data);
156 }
157 return size_helper();
158 }
159 #endif // INCLUDE_ALL_GCS
160