1 /*
2 * Copyright (c) 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 #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP
26 #define SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP
27
28 #include "classfile/javaClasses.hpp"
29 #include "gc/shared/referenceProcessor.hpp"
30 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
31 #include "oops/instanceKlass.inline.hpp"
32 #include "oops/instanceRefKlass.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "utilities/debug.hpp"
35 #include "utilities/globalDefinitions.hpp"
36 #include "utilities/macros.hpp"
37
38 template <bool nv, typename T, class OopClosureType, class Contains>
39 void InstanceRefKlass::oop_oop_iterate_ref_processing_specialized(oop obj, OopClosureType* closure, Contains& contains) {
40 T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
41 if (closure->apply_to_weak_ref_discovered_field()) {
42 Devirtualizer<nv>::do_oop(closure, disc_addr);
43 }
44
45 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
46 T heap_oop = oopDesc::load_heap_oop(referent_addr);
47 ReferenceProcessor* rp = closure->_ref_processor;
48 if (!oopDesc::is_null(heap_oop)) {
49 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
50 referent = oopDesc::bs()->resolve_and_update_oop(referent_addr, referent);
51 if (!referent->is_gc_marked() && (rp != NULL) &&
52 rp->discover_reference(obj, reference_type())) {
53 return;
54 } else if (contains(referent_addr)) {
55 // treat referent as normal oop
56 Devirtualizer<nv>::do_oop(closure, referent_addr);
57 }
58 }
59 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
60 T next_oop = oopDesc::load_heap_oop(next_addr);
61 // Treat discovered as normal oop, if ref is not "active" (next non-NULL)
62 if (!oopDesc::is_null(next_oop) && contains(disc_addr)) {
63 // i.e. ref is not "active"
64 debug_only(
65 if(TraceReferenceGC && PrintGCDetails) {
66 gclog_or_tty->print_cr(" Process discovered as normal "
67 PTR_FORMAT, p2i(disc_addr));
68 }
69 )
70 Devirtualizer<nv>::do_oop(closure, disc_addr);
71 }
72 // treat next as normal oop
73 if (contains(next_addr)) {
74 Devirtualizer<nv>::do_oop(closure, next_addr);
75 }
76 }
77
78 class AlwaysContains {
79 public:
80 template <typename T> bool operator()(T* p) const { return true; }
81 };
82
83 template <bool nv, class OopClosureType>
84 void InstanceRefKlass::oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure) {
85 AlwaysContains always_contains;
86 if (UseCompressedOops) {
87 oop_oop_iterate_ref_processing_specialized<nv, narrowOop>(obj, closure, always_contains);
88 } else {
89 oop_oop_iterate_ref_processing_specialized<nv, oop>(obj, closure, always_contains);
90 }
91 }
92
93 class MrContains {
94 const MemRegion _mr;
95 public:
96 MrContains(MemRegion mr) : _mr(mr) {}
97 template <typename T> bool operator()(T* p) const { return _mr.contains(p); }
98 };
99
100 template <bool nv, class OopClosureType>
101 void InstanceRefKlass::oop_oop_iterate_ref_processing_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
102 const MrContains contains(mr);
103 if (UseCompressedOops) {
104 oop_oop_iterate_ref_processing_specialized<nv, narrowOop>(obj, closure, contains);
105 } else {
106 oop_oop_iterate_ref_processing_specialized<nv, oop>(obj, closure, contains);
107 }
108 }
109
110 template <bool nv, class OopClosureType>
111 void InstanceRefKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
112 InstanceKlass::oop_oop_iterate<nv>(obj, closure);
113
114 oop_oop_iterate_ref_processing<nv>(obj, closure);
115 }
116
117 #if INCLUDE_ALL_GCS
118 template <bool nv, class OopClosureType>
119 void InstanceRefKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {
120 InstanceKlass::oop_oop_iterate_reverse<nv>(obj, closure);
121
122 oop_oop_iterate_ref_processing<nv>(obj, closure);
123 }
124 #endif // INCLUDE_ALL_GCS
125
126
127 template <bool nv, class OopClosureType>
128 void InstanceRefKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
129 InstanceKlass::oop_oop_iterate_bounded<nv>(obj, closure, mr);
130
131 oop_oop_iterate_ref_processing_bounded<nv>(obj, closure, mr);
132 }
133
134 // Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for
135 // all closures. Macros calling macros above for each oop size.
136 #define ALL_INSTANCE_REF_KLASS_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
137 OOP_OOP_ITERATE_DEFN( InstanceRefKlass, OopClosureType, nv_suffix) \
138 OOP_OOP_ITERATE_DEFN_BOUNDED( InstanceRefKlass, OopClosureType, nv_suffix) \
139 OOP_OOP_ITERATE_DEFN_BACKWARDS(InstanceRefKlass, OopClosureType, nv_suffix)
140
141 #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP