1 /*
2 * Copyright (c) 1997, 2010, 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 "oops/instanceRefKlass.hpp"
29 #include "oops/oop.inline2.hpp"
30
31 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
32
33 template <typename T, bool nv, typename OopClosureType>
34 void InstanceRefKlass::specialized_oop_iterate(oop obj,
35 OopClosureType* closure,
36 MemRegion* mr) {
37 T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
38 if (closure->apply_to_weak_ref_discovered_field()) {
39 Devirtualizer<nv, OopClosureType>::do_oop(closure, disc_addr);
40 }
41
42 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
43 T heap_oop = oopDesc::load_heap_oop(referent_addr);
44 ReferenceProcessor* rp = closure->_ref_processor;
45 if (!oopDesc::is_null(heap_oop)) {
46 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
47 if (!referent->is_gc_marked() && (rp != NULL) &&
48 rp->discover_reference(obj, reference_type())) {
49 return;
50 } else if (mr == NULL || mr->contains(referent_addr)) {
51 /* treat referent as normal oop */
52 Devirtualizer<nv, OopClosureType>::do_oop(closure, referent_addr);
53 }
54 }
55 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
56 if (ReferenceProcessor::pending_list_uses_discovered_field()) {
57 T next_oop = oopDesc::load_heap_oop(next_addr);
58 /* Treat discovered as normal oop, if ref is not "active" (next non-NULL) */
59 if (!oopDesc::is_null(next_oop) && (mr == NULL || mr->contains(disc_addr))) {
60 /* i.e. ref is not "active" */
61 debug_only(
62 if(TraceReferenceGC && PrintGCDetails) {
63 gclog_or_tty->print_cr(" Process discovered as normal "
64 INTPTR_FORMAT, disc_addr);
65 }
66 )
67 Devirtualizer<nv, OopClosureType>::do_oop(closure, disc_addr);
68 }
69 } else {
70 /* In the case of older JDKs which do not use the discovered field for */
71 /* the pending list, an inactive ref (next != NULL) must always have a */
72 /* NULL discovered field. */
73 debug_only(
74 T next_oop = oopDesc::load_heap_oop(next_addr);
75 T disc_oop = oopDesc::load_heap_oop(disc_addr);
76 assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop),
77 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL"
78 "discovered field", (oopDesc*)obj));
79 )
80 }
81 /* treat next as normal oop */
82 if (mr == NULL || mr->contains(next_addr)) {
83 Devirtualizer<nv, OopClosureType>::do_oop(closure, next_addr);
84 }
85 }
86
87 // Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for
88 // all closures. Macros calling macros above for each oop size.
89
90 template <bool nv, typename OopClosureType>
91 int InstanceRefKlass::
92 oop_oop_iterate(oop obj, OopClosureType* closure) {
93 /* Get size before changing pointers */
94
95 int size = InstanceKlass::oop_oop_iterate<nv>(obj, closure);
96
97 if (UseCompressedOops) {
98 specialized_oop_iterate<narrowOop, nv>(obj, closure, NULL);
99 } else {
100 specialized_oop_iterate<oop, nv>(obj, closure, NULL);
101 }
102
103 return size;
104 }
105
106 #ifndef SERIALGC
107
108 template <bool nv, typename OopClosureType>
109 int InstanceRefKlass::
110 oop_oop_iterate_backwards(oop obj, OopClosureType* closure) {
111 /* Get size before changing pointers */
112
113 int size = InstanceKlass::oop_oop_iterate_backwards<nv>(obj, closure);
114
115 if (UseCompressedOops) {
116 specialized_oop_iterate<narrowOop, nv>(obj, closure, NULL);
117 } else {
118 specialized_oop_iterate<oop, nv>(obj, closure, NULL);
119 }
120
121 return size;
122 }
123 #endif // !SERIALGC
124
125
126 template <bool nv, typename OopClosureType>
127 int InstanceRefKlass::
128 oop_oop_iterate_m(oop obj,
129 OopClosureType* closure,
130 MemRegion mr) {
131
132 int size = InstanceKlass::oop_oop_iterate_m<nv>(obj, closure, mr);
133
134 if (UseCompressedOops) {
135 specialized_oop_iterate<narrowOop, nv>(obj, closure, &mr);
136 } else {
137 specialized_oop_iterate<oop, nv>(obj, closure, &mr);
138 }
139
140 return size;
141 }
142
143 #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP