1 /*
2 * Copyright (c) 2011, 2015, 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/iterator.inline.hpp"
32 #include "memory/oopFactory.hpp"
33 #include "memory/specialized_oop_closures.hpp"
34 #include "oops/instanceKlass.hpp"
35 #include "oops/instanceClassLoaderKlass.hpp"
36 #include "oops/instanceMirrorKlass.hpp"
37 #include "oops/instanceOop.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "oops/symbol.hpp"
40 #include "runtime/handles.inline.hpp"
41 #include "utilities/macros.hpp"
42 #if INCLUDE_ALL_GCS
43 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
44 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
45 #endif // INCLUDE_ALL_GCS
46
47 // Macro to define InstanceClassLoaderKlass::oop_oop_iterate for virtual/nonvirtual for
48 // all closures. Macros calling macros above for each oop size.
49 // Since ClassLoader objects have only a pointer to the loader_data, they are not
50 // compressed nor does the pointer move.
51
52 #define InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)\
53 \
54 int InstanceClassLoaderKlass:: \
55 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
56 /* Get size before changing pointers */ \
57 int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
58 \
59 if_do_metadata_checked(closure, nv_suffix) { \
60 ClassLoaderData* cld = java_lang_ClassLoader::loader_data(obj); \
61 /* cld can be null if we have a non-registered class loader. */ \
62 if (cld != NULL) { \
63 closure->do_class_loader_data(cld); \
64 } \
65 } \
66 \
67 return size; \
68 }
69
70 #if INCLUDE_ALL_GCS
71 #define InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
72 \
73 int InstanceClassLoaderKlass:: \
74 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
75 /* Get size before changing pointers */ \
76 int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
77 return size; \
78 }
79 #endif // INCLUDE_ALL_GCS
80
81
82 #define InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
83 \
84 int InstanceClassLoaderKlass:: \
85 oop_oop_iterate##nv_suffix##_m(oop obj, \
86 OopClosureType* closure, \
87 MemRegion mr) { \
88 int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
89 \
90 if_do_metadata_checked(closure, nv_suffix) { \
91 if (mr.contains(obj)) { \
92 ClassLoaderData* cld = java_lang_ClassLoader::loader_data(obj); \
93 /* cld can be null if we have a non-registered class loader. */ \
94 if (cld != NULL) { \
95 closure->do_class_loader_data(cld); \
96 } \
97 } \
98 } \
99 \
100 return size; \
101 }
102
103 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN)
104 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN)
105 #if INCLUDE_ALL_GCS
106 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
107 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
108 #endif // INCLUDE_ALL_GCS
109 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m)
110 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DEFN_m)
111
112 void InstanceClassLoaderKlass::oop_follow_contents(oop obj) {
113 InstanceKlass::oop_follow_contents(obj);
114 ClassLoaderData * const loader_data = java_lang_ClassLoader::loader_data(obj);
115
116 // We must NULL check here, since the class loader
117 // can be found before the loader data has been set up.
118 if(loader_data != NULL) {
119 MarkSweep::follow_class_loader(loader_data);
120 }
121 }
122
123 #if INCLUDE_ALL_GCS
124 void InstanceClassLoaderKlass::oop_follow_contents(ParCompactionManager* cm,
125 oop obj) {
126 InstanceKlass::oop_follow_contents(cm, obj);
127 ClassLoaderData * const loader_data = java_lang_ClassLoader::loader_data(obj);
128 if (loader_data != NULL) {
129 PSParallelCompact::follow_class_loader(cm, loader_data);
130 }
131 }
132
133 void InstanceClassLoaderKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
134 InstanceKlass::oop_push_contents(pm, obj);
135
136 // This is called by the young collector. It will already have taken care of
137 // all class loader data. So, we don't have to follow the class loader ->
138 // class loader data link.
139 }
140
141 int InstanceClassLoaderKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
142 InstanceKlass::oop_update_pointers(cm, obj);
143 return size_helper();
144 }
145 #endif // INCLUDE_ALL_GCS
146