1 /*
2 * Copyright (c) 2015, 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 *
61 }
62
63 template <typename T, class OopClosureType>
64 bool InstanceRefKlass::try_discover(oop obj, ReferenceType type, OopClosureType* closure) {
65 ReferenceProcessor* rp = closure->ref_processor();
66 if (rp != NULL) {
67 T referent_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::referent_addr(obj));
68 if (!oopDesc::is_null(referent_oop)) {
69 oop referent = oopDesc::decode_heap_oop_not_null(referent_oop);
70 if (!referent->is_gc_marked()) {
71 // Only try to discover if not yet marked.
72 return rp->discover_reference(obj, type);
73 }
74 }
75 }
76 return false;
77 }
78
79 template <bool nv, typename T, class OopClosureType, class Contains>
80 void InstanceRefKlass::oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {
81 log_develop_trace(gc, ref)("Process reference default " PTR_FORMAT, p2i(obj));
82
83 // Special case for some closures.
84 if (closure->apply_to_weak_ref_discovered_field()) {
85 do_discovered<nv, T>(obj, closure, contains);
86 }
87
88 // Try to discover reference and return if it succeeds.
89 if (try_discover<T>(obj, type, closure)) {
90 return;
91 }
92
93 // Treat referent as normal oop.
94 do_referent<nv, T>(obj, closure, contains);
95
96 // Treat discovered as normal oop, if ref is not "active" (next non-NULL).
97 T next_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::next_addr(obj));
98 if (!oopDesc::is_null(next_oop)) {
99 do_discovered<nv, T>(obj, closure, contains);
100 }
101
102 // Treat next as normal oop.
103 do_next<nv, T>(obj, closure, contains);
104 }
105
106 template <bool nv, typename T, class OopClosureType, class Contains>
107 void InstanceRefKlass::oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains) {
108 do_referent<nv, T>(obj, closure, contains);
109 do_discovered<nv, T>(obj, closure, contains);
110 do_next<nv, T>(obj, closure, contains);
111 debug_only(trace_reference_gc("InstanceRefKlass::oop_oop_iterate_fields()",
112 obj,
113 (T*)java_lang_ref_Reference::referent_addr(obj),
114 (T*)java_lang_ref_Reference::next_addr(obj),
115 (T*)java_lang_ref_Reference::discovered_addr(obj));)
116 }
117
118 template <bool nv, typename T, class OopClosureType, class Contains>
119 void InstanceRefKlass::oop_oop_iterate_ref_processing_specialized(oop obj, OopClosureType* closure, Contains& contains) {
120 switch (closure->reference_iteration_mode()) {
121 case ExtendedOopClosure::DO_DISCOVERY:
122 oop_oop_iterate_discovery<nv, T>(obj, reference_type(), closure, contains);
123 break;
124 case ExtendedOopClosure::DO_FIELDS:
125 oop_oop_iterate_fields<nv, T>(obj, closure, contains);
126 break;
127 default:
128 ShouldNotReachHere();
129 }
130 }
131
132 class AlwaysContains {
133 public:
134 template <typename T> bool operator()(T* p) const { return true; }
135 };
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1 /*
2 * Copyright (c) 2015, 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 *
61 }
62
63 template <typename T, class OopClosureType>
64 bool InstanceRefKlass::try_discover(oop obj, ReferenceType type, OopClosureType* closure) {
65 ReferenceProcessor* rp = closure->ref_processor();
66 if (rp != NULL) {
67 T referent_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::referent_addr(obj));
68 if (!oopDesc::is_null(referent_oop)) {
69 oop referent = oopDesc::decode_heap_oop_not_null(referent_oop);
70 if (!referent->is_gc_marked()) {
71 // Only try to discover if not yet marked.
72 return rp->discover_reference(obj, type);
73 }
74 }
75 }
76 return false;
77 }
78
79 template <bool nv, typename T, class OopClosureType, class Contains>
80 void InstanceRefKlass::oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {
81 log_develop_trace(gc, ref)("Process reference with discovery " PTR_FORMAT, p2i(obj));
82
83 // Special case for some closures.
84 if (closure->apply_to_weak_ref_discovered_field()) {
85 do_discovered<nv, T>(obj, closure, contains);
86 }
87
88 // Try to discover reference and return if it succeeds.
89 if (try_discover<T>(obj, type, closure)) {
90 return;
91 }
92
93 // Treat referent as normal oop.
94 do_referent<nv, T>(obj, closure, contains);
95
96 // Treat discovered as normal oop, if ref is not "active" (next non-NULL).
97 T next_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::next_addr(obj));
98 if (!oopDesc::is_null(next_oop)) {
99 do_discovered<nv, T>(obj, closure, contains);
100 }
101
102 // Treat next as normal oop.
103 do_next<nv, T>(obj, closure, contains);
104 }
105
106 template <bool nv, typename T, class OopClosureType, class Contains>
107 void InstanceRefKlass::oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains) {
108 do_referent<nv, T>(obj, closure, contains);
109 do_discovered<nv, T>(obj, closure, contains);
110 do_next<nv, T>(obj, closure, contains);
111 trace_reference_gc("InstanceRefKlass::oop_oop_iterate_fields()",
112 obj,
113 (T*)java_lang_ref_Reference::referent_addr(obj),
114 (T*)java_lang_ref_Reference::next_addr(obj),
115 (T*)java_lang_ref_Reference::discovered_addr(obj));
116 }
117
118 template <bool nv, typename T, class OopClosureType, class Contains>
119 void InstanceRefKlass::oop_oop_iterate_ref_processing_specialized(oop obj, OopClosureType* closure, Contains& contains) {
120 switch (closure->reference_iteration_mode()) {
121 case ExtendedOopClosure::DO_DISCOVERY:
122 oop_oop_iterate_discovery<nv, T>(obj, reference_type(), closure, contains);
123 break;
124 case ExtendedOopClosure::DO_FIELDS:
125 oop_oop_iterate_fields<nv, T>(obj, closure, contains);
126 break;
127 default:
128 ShouldNotReachHere();
129 }
130 }
131
132 class AlwaysContains {
133 public:
134 template <typename T> bool operator()(T* p) const { return true; }
135 };
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