1 /*
2 * Copyright (c) 2019, 2020, 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 *
103 }
104 current = prev;
105 }
106 }
107 return count;
108 }
109
110 static int array_size(const oop object) {
111 assert(object != NULL, "invariant");
112 if (object->is_array()) {
113 return arrayOop(object)->length();
114 }
115 return min_jint;
116 }
117
118 void EventEmitter::link_sample_with_edge(const ObjectSample* sample, EdgeStore* edge_store) {
119 assert(sample != NULL, "invariant");
120 assert(!sample->is_dead(), "invariant");
121 assert(edge_store != NULL, "invariant");
122 if (SafepointSynchronize::is_at_safepoint()) {
123 if (!sample->object()->mark().is_marked()) {
124 // Associated with an edge (chain) already during heap traversal.
125 return;
126 }
127 }
128 // In order to dump out a representation of the event
129 // even though the sample object was found not reachable / too long to reach,
130 // we need to register a top level edge.
131 edge_store->put(UnifiedOopRef::encode_in_native(sample->object_addr()));
132 }
133
134 void EventEmitter::write_event(const ObjectSample* sample, EdgeStore* edge_store) {
135 assert(sample != NULL, "invariant");
136 assert(!sample->is_dead(), "invariant");
137 assert(edge_store != NULL, "invariant");
138 assert(_jfr_thread_local != NULL, "invariant");
139
140 traceid gc_root_id = 0;
141 const Edge* edge = NULL;
142 if (SafepointSynchronize::is_at_safepoint()) {
143 if (!sample->object()->mark().is_marked()) {
144 edge = (const Edge*)(sample->object())->mark().to_pointer();
145 }
146 }
147 if (edge == NULL) {
148 edge = edge_store->get(UnifiedOopRef::encode_in_native(sample->object_addr()));
149 } else {
150 gc_root_id = edge_store->gc_root_id(edge);
151 }
152 assert(edge != NULL, "invariant");
153 const traceid object_id = edge_store->get_id(edge);
154 assert(object_id != 0, "invariant");
155
156 Tickspan object_age = Ticks(_start_time.value()) - sample->allocation_time();
157
158 EventOldObjectSample e(UNTIMED);
159 e.set_starttime(_start_time);
160 e.set_endtime(_end_time);
161 e.set_allocationTime(sample->allocation_time());
162 e.set_objectAge(object_age);
163 e.set_lastKnownHeapUsage(sample->heap_used_at_last_gc());
164 e.set_object(object_id);
165 e.set_arrayElements(array_size(edge->pointee()));
166 e.set_root(gc_root_id);
167
168 // Temporarily assigning both the stack trace id and thread id
169 // onto the thread local data structure of the emitter thread (for the duration
170 // of the commit() call). This trick provides a means to override
171 // the event generation mechanism by injecting externally provided id's.
172 // At this particular location, it allows us to emit an old object event
173 // supplying information from where the actual sampling occurred.
174 _jfr_thread_local->set_cached_stack_trace_id(sample->stack_trace_id());
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1 /*
2 * Copyright (c) 2019, 2021, 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 *
103 }
104 current = prev;
105 }
106 }
107 return count;
108 }
109
110 static int array_size(const oop object) {
111 assert(object != NULL, "invariant");
112 if (object->is_array()) {
113 return arrayOop(object)->length();
114 }
115 return min_jint;
116 }
117
118 void EventEmitter::link_sample_with_edge(const ObjectSample* sample, EdgeStore* edge_store) {
119 assert(sample != NULL, "invariant");
120 assert(!sample->is_dead(), "invariant");
121 assert(edge_store != NULL, "invariant");
122 if (SafepointSynchronize::is_at_safepoint()) {
123 if (edge_store->has_leak_context(sample)) {
124 // Associated with an edge (chain) already during heap traversal.
125 return;
126 }
127 }
128 // In order to dump out a representation of the event
129 // even though the sample object was found not reachable / too long to reach,
130 // we need to register a top level edge.
131 edge_store->put(UnifiedOopRef::encode_in_native(sample->object_addr()));
132 }
133
134 void EventEmitter::write_event(const ObjectSample* sample, EdgeStore* edge_store) {
135 assert(sample != NULL, "invariant");
136 assert(!sample->is_dead(), "invariant");
137 assert(edge_store != NULL, "invariant");
138 assert(_jfr_thread_local != NULL, "invariant");
139
140 const StoredEdge* const edge = edge_store->get(sample);
141 assert(edge != NULL, "invariant");
142 assert(edge->pointee() == sample->object(), "invariant");
143 const traceid object_id = edge_store->get_id(edge);
144 assert(object_id != 0, "invariant");
145 const traceid gc_root_id = edge->gc_root_id();
146
147 Tickspan object_age = Ticks(_start_time.value()) - sample->allocation_time();
148
149 EventOldObjectSample e(UNTIMED);
150 e.set_starttime(_start_time);
151 e.set_endtime(_end_time);
152 e.set_allocationTime(sample->allocation_time());
153 e.set_objectAge(object_age);
154 e.set_lastKnownHeapUsage(sample->heap_used_at_last_gc());
155 e.set_object(object_id);
156 e.set_arrayElements(array_size(edge->pointee()));
157 e.set_root(gc_root_id);
158
159 // Temporarily assigning both the stack trace id and thread id
160 // onto the thread local data structure of the emitter thread (for the duration
161 // of the commit() call). This trick provides a means to override
162 // the event generation mechanism by injecting externally provided id's.
163 // At this particular location, it allows us to emit an old object event
164 // supplying information from where the actual sampling occurred.
165 _jfr_thread_local->set_cached_stack_trace_id(sample->stack_trace_id());
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