62 template <typename T, class OopClosureType>
63 bool InstanceRefKlass::try_discover(oop obj, ReferenceType type, OopClosureType* closure) {
64 ReferenceProcessor* rp = closure->ref_processor();
65 if (rp != NULL) {
66 T referent_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::referent_addr(obj));
67 if (!oopDesc::is_null(referent_oop)) {
68 oop referent = oopDesc::decode_heap_oop_not_null(referent_oop);
69 if (!referent->is_gc_marked()) {
70 // Only try to discover if not yet marked.
71 return rp->discover_reference(obj, type);
72 }
73 }
74 }
75 return false;
76 }
77
78 template <bool nv, typename T, class OopClosureType, class Contains>
79 void InstanceRefKlass::oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {
80 log_develop_trace(gc, ref)("Process reference with discovery " PTR_FORMAT, p2i(obj));
81
82 // Special case for some closures.
83 if (closure->apply_to_weak_ref_discovered_field()) {
84 do_discovered<nv, T>(obj, closure, contains);
85 }
86
87 // Try to discover reference and return if it succeeds.
88 if (try_discover<T>(obj, type, closure)) {
89 return;
90 }
91
92 // Treat referent as normal oop.
93 do_referent<nv, T>(obj, closure, contains);
94
95 // Treat discovered as normal oop, if ref is not "active" (next non-NULL).
96 T next_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::next_addr(obj));
97 if (!oopDesc::is_null(next_oop)) {
98 do_discovered<nv, T>(obj, closure, contains);
99 }
100
101 // Treat next as normal oop.
102 do_next<nv, T>(obj, closure, contains);
103 }
104
105 template <bool nv, typename T, class OopClosureType, class Contains>
106 void InstanceRefKlass::oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains) {
107 do_referent<nv, T>(obj, closure, contains);
108 do_discovered<nv, T>(obj, closure, contains);
109 do_next<nv, T>(obj, closure, contains);
110
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 };
136
137 template <bool nv, class OopClosureType>
138 void InstanceRefKlass::oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure) {
139 AlwaysContains always_contains;
140 if (UseCompressedOops) {
141 oop_oop_iterate_ref_processing_specialized<nv, narrowOop>(obj, closure, always_contains);
142 } else {
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62 template <typename T, class OopClosureType>
63 bool InstanceRefKlass::try_discover(oop obj, ReferenceType type, OopClosureType* closure) {
64 ReferenceProcessor* rp = closure->ref_processor();
65 if (rp != NULL) {
66 T referent_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::referent_addr(obj));
67 if (!oopDesc::is_null(referent_oop)) {
68 oop referent = oopDesc::decode_heap_oop_not_null(referent_oop);
69 if (!referent->is_gc_marked()) {
70 // Only try to discover if not yet marked.
71 return rp->discover_reference(obj, type);
72 }
73 }
74 }
75 return false;
76 }
77
78 template <bool nv, typename T, class OopClosureType, class Contains>
79 void InstanceRefKlass::oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {
80 log_develop_trace(gc, ref)("Process reference with discovery " PTR_FORMAT, p2i(obj));
81
82 // Try to discover reference and return if it succeeds.
83 if (try_discover<T>(obj, type, closure)) {
84 return;
85 }
86
87 // Treat referent as normal oop.
88 do_referent<nv, T>(obj, closure, contains);
89
90 // Treat discovered as normal oop, if ref is not "active" (next non-NULL).
91 T next_oop = oopDesc::load_heap_oop((T*)java_lang_ref_Reference::next_addr(obj));
92 if (!oopDesc::is_null(next_oop)) {
93 do_discovered<nv, T>(obj, closure, contains);
94 }
95
96 // Treat next as normal oop.
97 do_next<nv, T>(obj, closure, contains);
98 }
99
100 template <bool nv, typename T, class OopClosureType, class Contains>
101 void InstanceRefKlass::oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains) {
102 do_referent<nv, T>(obj, closure, contains);
103 do_discovered<nv, T>(obj, closure, contains);
104 do_next<nv, T>(obj, closure, contains);
105
106 trace_reference_gc("InstanceRefKlass::oop_oop_iterate_fields()",
107 obj,
108 (T*)java_lang_ref_Reference::referent_addr(obj),
109 (T*)java_lang_ref_Reference::next_addr(obj),
110 (T*)java_lang_ref_Reference::discovered_addr(obj));
111 }
112
113 template <bool nv, typename T, class OopClosureType, class Contains>
114 void InstanceRefKlass::oop_oop_iterate_discovered_and_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains) {
115 // Explicitly apply closure to the discovered field.
116 do_discovered<nv, T>(obj, closure, contains);
117 // Then do normal reference processing with discovery.
118 oop_oop_iterate_discovery<nv, T>(obj, type, closure, contains);
119 }
120
121 template <bool nv, typename T, class OopClosureType, class Contains>
122 void InstanceRefKlass::oop_oop_iterate_ref_processing_specialized(oop obj, OopClosureType* closure, Contains& contains) {
123 switch (closure->reference_iteration_mode()) {
124 case ExtendedOopClosure::DO_DISCOVERY:
125 oop_oop_iterate_discovery<nv, T>(obj, reference_type(), closure, contains);
126 break;
127 case ExtendedOopClosure::DO_DISCOVERED_AND_DISCOVERY:
128 oop_oop_iterate_discovered_and_discovery<nv, T>(obj, reference_type(), closure, contains);
129 break;
130 case ExtendedOopClosure::DO_FIELDS:
131 oop_oop_iterate_fields<nv, T>(obj, closure, contains);
132 break;
133 default:
134 ShouldNotReachHere();
135 }
136 }
137
138 class AlwaysContains {
139 public:
140 template <typename T> bool operator()(T* p) const { return true; }
141 };
142
143 template <bool nv, class OopClosureType>
144 void InstanceRefKlass::oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure) {
145 AlwaysContains always_contains;
146 if (UseCompressedOops) {
147 oop_oop_iterate_ref_processing_specialized<nv, narrowOop>(obj, closure, always_contains);
148 } else {
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