1 /*
2 * Copyright (c) 1997, 2019, 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 #include "precompiled.hpp"
26 #include "memory/allocation.inline.hpp"
27 #include "oops/instanceKlass.hpp"
28 #include "runtime/mutexLocker.hpp"
29 #include "runtime/os.inline.hpp"
30 #include "runtime/osThread.hpp"
31 #include "runtime/thread.inline.hpp"
32 #include "runtime/threadCritical.hpp"
33 #include "runtime/timer.hpp"
34 #include "utilities/events.hpp"
35
36
37 EventLog* Events::_logs = NULL;
38 StringEventLog* Events::_messages = NULL;
39 ExceptionsEventLog* Events::_exceptions = NULL;
40 StringEventLog* Events::_redefinitions = NULL;
41 UnloadingEventLog* Events::_class_unloading = NULL;
42 StringEventLog* Events::_deopt_messages = NULL;
43
44 EventLog::EventLog() {
45 // This normally done during bootstrap when we're only single
46 // threaded but use a ThreadCritical to ensure inclusion in case
47 // some are created slightly late.
48 ThreadCritical tc;
49 _next = Events::_logs;
50 Events::_logs = this;
51 }
52
53 // For each registered event logger, print out the current contents of
54 // the buffer.
55 void Events::print_all(outputStream* out, int max) {
56 EventLog* log = _logs;
57 while (log != NULL) {
58 log->print_log_on(out, max);
59 log = log->next();
60 }
61 }
62
63 // Print a single event log specified by name.
64 void Events::print_one(outputStream* out, const char* log_name, int max) {
65 EventLog* log = _logs;
66 int num_printed = 0;
67 while (log != NULL) {
68 if (log->matches_name_or_handle(log_name)) {
69 log->print_log_on(out, max);
70 num_printed ++;
71 }
72 log = log->next();
73 }
74 // Write a short error note if no name matched.
75 if (num_printed == 0) {
76 out->print_cr("The name \"%s\" did not match any known event log. "
77 "Valid event log names are:", log_name);
78 EventLog* log = _logs;
79 while (log != NULL) {
80 log->print_names(out);
81 out->cr();
82 log = log->next();
83 }
84 }
85 }
86
87
88 void Events::print() {
89 print_all(tty);
90 }
91
92 void Events::init() {
93 if (LogEvents) {
94 _messages = new StringEventLog("Events", "events");
95 _exceptions = new ExceptionsEventLog("Internal exceptions", "exc");
96 _redefinitions = new StringEventLog("Classes redefined", "redef");
97 _class_unloading = new UnloadingEventLog("Classes unloaded", "unload");
98 _deopt_messages = new StringEventLog("Deoptimization events", "deopt");
99 }
100 }
101
102 void eventlog_init() {
103 Events::init();
104 }
105
106 ///////////////////////////////////////////////////////////////////////////
107 // EventMark
108
109 EventMark::EventMark(const char* format, ...) {
110 if (LogEvents) {
111 va_list ap;
112 va_start(ap, format);
113 // Save a copy of begin message and log it.
114 _buffer.printv(format, ap);
115 Events::log(NULL, "%s", _buffer.buffer());
116 va_end(ap);
117 }
118 }
119
120 EventMark::~EventMark() {
121 if (LogEvents) {
122 // Append " done" to the begin message and log it
123 _buffer.append(" done");
124 Events::log(NULL, "%s", _buffer.buffer());
125 }
126 }
127
128 void UnloadingEventLog::log(Thread* thread, InstanceKlass* ik) {
129 if (!should_log()) return;
130
131 double timestamp = fetch_timestamp();
132 // Unloading events are single threaded.
133 int index = compute_log_index();
134 _records[index].thread = thread;
135 _records[index].timestamp = timestamp;
136 stringStream st(_records[index].data.buffer(),
137 _records[index].data.size());
138 st.print("Unloading class " INTPTR_FORMAT " ", p2i(ik));
139 ik->name()->print_value_on(&st);
140 }
141
142 void ExceptionsEventLog::log(Thread* thread, Handle h_exception, const char* message, const char* file, int line) {
143 if (!should_log()) return;
144
145 double timestamp = fetch_timestamp();
146 MutexLocker ml(&_mutex, Mutex::_no_safepoint_check_flag);
147 int index = compute_log_index();
148 _records[index].thread = thread;
149 _records[index].timestamp = timestamp;
150 stringStream st(_records[index].data.buffer(),
151 _records[index].data.size());
152 st.print("Exception <");
153 h_exception->print_value_on(&st);
154 st.print("%s%s> (" INTPTR_FORMAT ") \n"
155 "thrown [%s, line %d]",
156 message ? ": " : "", message ? message : "",
157 p2i(h_exception()), file, line);
158 }