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10405
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1 /*
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_TRACE_TRACEEVENT_HPP
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26 #define SHARE_VM_TRACE_TRACEEVENT_HPP
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27
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28 enum EventStartTime {
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29 UNTIMED,
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30 TIMED
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31 };
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32
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33 #include "utilities/macros.hpp"
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34
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35 #if INCLUDE_TRACE
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36
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37 #include "trace/traceBackend.hpp"
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38 #include "trace/tracing.hpp"
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39 #include "tracefiles/traceEventIds.hpp"
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40 #include "tracefiles/traceTypes.hpp"
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41
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42 template<typename T>
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43 class TraceEvent : public StackObj {
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44 protected:
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45 jlong _startTime;
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46 jlong _endTime;
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47
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48 private:
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49 bool _started;
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50 #ifdef ASSERT
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51 bool _committed;
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52 bool _cancelled;
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53 protected:
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54 bool _ignore_check;
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55 #endif
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56
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57 public:
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58 TraceEvent(EventStartTime timing=TIMED) :
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59 _startTime(0),
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60 _endTime(0),
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61 _started(false)
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62 #ifdef ASSERT
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63 ,
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64 _committed(false),
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65 _cancelled(false),
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66 _ignore_check(false)
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67 #endif
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68 {
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69 if (T::is_enabled()) {
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70 _started = true;
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71 if (timing == TIMED && !T::isInstant) {
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72 static_cast<T *>(this)->set_starttime(Tracing::time());
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73 }
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74 }
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75 }
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76
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77 static bool is_enabled() {
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78 return Tracing::is_event_enabled(T::eventId);
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79 }
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80
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81 bool should_commit() {
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82 return _started;
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83 }
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84
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85 void ignoreCheck() {
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86 DEBUG_ONLY(_ignore_check = true);
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87 }
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88
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89 void commit() {
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90 if (!should_commit()) {
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91 cancel();
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92 return;
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93 }
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94 if (_endTime == 0) {
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95 static_cast<T*>(this)->set_endtime(Tracing::time());
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96 }
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97 if (static_cast<T*>(this)->should_write()) {
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98 static_cast<T*>(this)->writeEvent();
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99 }
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100 set_commited();
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101 }
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102
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103 void set_starttime(jlong time) {
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104 _startTime = time;
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105 }
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106
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107 void set_endtime(jlong time) {
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108 _endTime = time;
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109 }
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110
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111 TraceEventId id() const {
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112 return T::eventId;
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113 }
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114
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115 bool is_instant() const {
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116 return T::isInstant;
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117 }
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118
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119 bool is_requestable() const {
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120 return T::isRequestable;
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121 }
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122
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123 bool has_thread() const {
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124 return T::hasThread;
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125 }
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126
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127 bool has_stacktrace() const {
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128 return T::hasStackTrace;
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129 }
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130
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131 void cancel() {
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132 assert(!_committed && !_cancelled, "event was already committed/cancelled");
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133 DEBUG_ONLY(_cancelled = true);
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134 }
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135
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136 void set_commited() {
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137 assert(!_committed, "event has already been committed");
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138 DEBUG_ONLY(_committed = true);
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139 }
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140
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141 ~TraceEvent() {
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142 if (_started) {
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143 assert(_ignore_check || _committed || _cancelled, "event was not committed/cancelled");
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144 }
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145 }
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146 };
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147
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148 #endif /* INCLUDE_TRACE */
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149
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150 #endif /* SHARE_VM_TRACE_TRACEEVENT_HPP */
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