1 /*
2 * Copyright (C) 2013 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "core/inspector/TraceEventDispatcher.h"
33
34 #include "core/inspector/InspectorClient.h"
35 #include "wtf/CurrentTime.h"
36 #include "wtf/Functional.h"
37 #include "wtf/MainThread.h"
38 #include "wtf/text/StringHash.h"
39
40 namespace WebCore {
41
dispatchEventOnAnyThread(char phase,const unsigned char *,const char * name,unsigned long long id,int numArgs,const char * const * argNames,const unsigned char * argTypes,const unsigned long long * argValues,unsigned char flags,double timestamp)42 void TraceEventDispatcher::dispatchEventOnAnyThread(char phase, const unsigned char*, const char* name, unsigned long long id,
43 int numArgs, const char* const* argNames, const unsigned char* argTypes, const unsigned long long* argValues,
44 unsigned char flags, double timestamp)
45 {
46 if (phase == TRACE_EVENT_PHASE_INSTANT_WITH_SCOPE)
47 phase = TRACE_EVENT_PHASE_INSTANT;
48 TraceEventDispatcher* self = instance();
49 {
50 MutexLocker locker(self->m_mutex);
51 if (self->m_handlers.find(std::make_pair(name, phase)) == self->m_handlers.end())
52 return;
53 }
54 self->enqueueEvent(TraceEvent(timestamp, phase, name, id, currentThread(), numArgs, argNames, argTypes, argValues));
55 if (isMainThread())
56 self->processBackgroundEvents();
57 }
58
enqueueEvent(const TraceEvent & event)59 void TraceEventDispatcher::enqueueEvent(const TraceEvent& event)
60 {
61 const float eventProcessingThresholdInSeconds = 0.1;
62 {
63 MutexLocker locker(m_mutex);
64 m_backgroundEvents.append(event);
65 if (m_processEventsTaskInFlight || event.timestamp() - m_lastEventProcessingTime <= eventProcessingThresholdInSeconds)
66 return;
67 }
68 m_processEventsTaskInFlight = true;
69 callOnMainThread(bind(&TraceEventDispatcher::processBackgroundEventsTask, this));
70 }
71
processBackgroundEventsTask()72 void TraceEventDispatcher::processBackgroundEventsTask()
73 {
74 m_processEventsTaskInFlight = false;
75 processBackgroundEvents();
76 }
77
processBackgroundEvents()78 void TraceEventDispatcher::processBackgroundEvents()
79 {
80 ASSERT(isMainThread());
81 Vector<TraceEvent> events;
82 {
83 MutexLocker locker(m_mutex);
84 m_lastEventProcessingTime = WTF::monotonicallyIncreasingTime();
85 if (m_backgroundEvents.isEmpty())
86 return;
87 events.reserveCapacity(m_backgroundEvents.capacity());
88 m_backgroundEvents.swap(events);
89 }
90 for (size_t eventIndex = 0, size = events.size(); eventIndex < size; ++eventIndex) {
91 const TraceEvent& event = events[eventIndex];
92 HandlersMap::iterator it = m_handlers.find(std::make_pair(event.name(), event.phase()));
93 if (it == m_handlers.end())
94 continue;
95 Vector<BoundTraceEventHandler>& handlers = it->value;
96 for (size_t handlerIndex = 0; handlerIndex < handlers.size(); ++handlerIndex)
97 (handlers[handlerIndex].instance->*(handlers[handlerIndex].method))(event);
98 }
99 }
100
innerAddListener(const char * name,char phase,TraceEventTargetBase * instance,TraceEventHandlerMethod method,InspectorClient * client)101 void TraceEventDispatcher::innerAddListener(const char* name, char phase, TraceEventTargetBase* instance, TraceEventHandlerMethod method, InspectorClient* client)
102 {
103 ASSERT(isMainThread());
104 MutexLocker locker(m_mutex);
105 if (m_handlers.isEmpty())
106 client->setTraceEventCallback(dispatchEventOnAnyThread);
107 HandlersMap::iterator it = m_handlers.find(std::make_pair(name, phase));
108 if (it == m_handlers.end())
109 it = m_handlers.add(std::make_pair(name, phase), Vector<BoundTraceEventHandler>()).iterator;
110 it->value.append(BoundTraceEventHandler(instance, method));
111 }
112
removeAllListeners(TraceEventTargetBase * instance,InspectorClient * client)113 void TraceEventDispatcher::removeAllListeners(TraceEventTargetBase* instance, InspectorClient* client)
114 {
115 ASSERT(isMainThread());
116 processBackgroundEvents();
117 {
118 MutexLocker locker(m_mutex);
119
120 HandlersMap remainingHandlers;
121 for (HandlersMap::iterator it = m_handlers.begin(); it != m_handlers.end(); ++it) {
122 Vector<BoundTraceEventHandler>& handlers = it->value;
123 for (size_t j = 0; j < handlers.size();) {
124 if (handlers[j].instance == instance)
125 handlers.remove(j);
126 else
127 ++j;
128 }
129 if (!handlers.isEmpty())
130 remainingHandlers.add(it->key, it->value);
131 }
132 m_handlers.swap(remainingHandlers);
133 }
134 if (m_handlers.isEmpty())
135 client->setTraceEventCallback(0);
136 }
137
findParameter(const char * name) const138 size_t TraceEventDispatcher::TraceEvent::findParameter(const char* name) const
139 {
140 for (int i = 0; i < m_argumentCount; ++i) {
141 if (!strcmp(name, m_argumentNames[i]))
142 return i;
143 }
144 return kNotFound;
145 }
146
parameter(const char * name,unsigned char expectedType) const147 const TraceEvent::TraceValueUnion& TraceEventDispatcher::TraceEvent::parameter(const char* name, unsigned char expectedType) const
148 {
149 static WebCore::TraceEvent::TraceValueUnion missingValue;
150 size_t index = findParameter(name);
151 if (index == kNotFound || m_argumentTypes[index] != expectedType) {
152 ASSERT_NOT_REACHED();
153 return missingValue;
154 }
155 return *reinterpret_cast<const WebCore::TraceEvent::TraceValueUnion*>(m_argumentValues + index);
156 }
157
158 } // namespace WebCore
159
160