third_party/WebKit/Source/platform/EventTracer.cpp

   1 /*
   2  * Copyright (C) 2011 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 "platform/EventTracer.h"
  33
  34 #include "public/platform/Platform.h"
  35 #include "public/platform/WebConvertableToTraceFormat.h"
  36 #include "wtf/Assertions.h"
  37 #include <stdio.h>
  38
  39 namespace blink {
  40
  41 static_assert(sizeof(Platform::TraceEventHandle) == sizeof(TraceEvent::TraceEventHandle), "TraceEventHandle types must be compatible");
  42 static_assert(sizeof(Platform::TraceEventAPIAtomicWord) == sizeof(TraceEvent::TraceEventAPIAtomicWord), "TraceEventAPIAtomicWord types must be compatible");
  43 static_assert(sizeof(TraceEvent::TraceEventAPIAtomicWord) == sizeof(const char*), "TraceEventAPIAtomicWord must be pointer-sized.");
  44
  45 // The dummy variable is needed to avoid a crash when someone updates the state variables
  46 // before EventTracer::initialize() is called.
  47 TraceEvent::TraceEventAPIAtomicWord dummyTraceSamplingState = 0;
  48 TraceEvent::TraceEventAPIAtomicWord* traceSamplingState[3] = {&dummyTraceSamplingState, &dummyTraceSamplingState, &dummyTraceSamplingState };
  49
  50 void EventTracer::initialize()
  51 {
  52     // current() might not exist in unit tests.
  53     if (!Platform::current())
  54         return;
  55
  56     traceSamplingState[0] = Platform::current()->getTraceSamplingState(0);
  57     // FIXME: traceSamplingState[0] can be 0 in split-dll build. http://crbug.com/256965
  58     if (!traceSamplingState[0])
  59         traceSamplingState[0] = &dummyTraceSamplingState;
  60     traceSamplingState[1] = Platform::current()->getTraceSamplingState(1);
  61     if (!traceSamplingState[1])
  62         traceSamplingState[1] = &dummyTraceSamplingState;
  63     traceSamplingState[2] = Platform::current()->getTraceSamplingState(2);
  64     if (!traceSamplingState[2])
  65         traceSamplingState[2] = &dummyTraceSamplingState;
  66 }
  67
  68 const unsigned char* EventTracer::getTraceCategoryEnabledFlag(const char* categoryName)
  69 {
  70     static const char* dummyCategoryEnabledFlag = "*";
  71     // current() might not exist in unit tests.
  72     if (!Platform::current())
  73         return reinterpret_cast<const unsigned char*>(dummyCategoryEnabledFlag);
  74
  75     return Platform::current()->getTraceCategoryEnabledFlag(categoryName);
  76 }
  77
  78 TraceEvent::TraceEventHandle EventTracer::addTraceEvent(char phase, const unsigned char* categoryEnabledFlag,
  79     const char* name, unsigned long long id, double timestamp,
  80     int numArgs, const char* argNames[], const unsigned char argTypes[],
  81     const unsigned long long argValues[],
  82     PassRefPtr<TraceEvent::ConvertableToTraceFormat> convertableValue1,
  83     PassRefPtr<TraceEvent::ConvertableToTraceFormat> convertableValue2,
  84     unsigned char flags)
  85 {
  86     WebConvertableToTraceFormat webConvertableValues[2];
  87     webConvertableValues[0] = WebConvertableToTraceFormat(convertableValue1);
  88     webConvertableValues[1] = WebConvertableToTraceFormat(convertableValue2);
  89     return Platform::current()->addTraceEvent(phase, categoryEnabledFlag, name, id, timestamp, numArgs, argNames, argTypes, argValues, webConvertableValues, flags);
  90 }
  91
  92 TraceEvent::TraceEventHandle EventTracer::addTraceEvent(char phase, const unsigned char* categoryEnabledFlag,
  93     const char* name, unsigned long long id, double timestamp,
  94     int numArgs, const char** argNames, const unsigned char* argTypes,
  95     const unsigned long long* argValues, unsigned char flags)
  96 {
  97     return Platform::current()->addTraceEvent(phase, categoryEnabledFlag, name, id, timestamp, numArgs, argNames, argTypes, argValues, 0, flags);
  98 }
  99
 100 void EventTracer::updateTraceEventDuration(const unsigned char* categoryEnabledFlag, const char* name, TraceEvent::TraceEventHandle handle)
 101 {
 102     Platform::current()->updateTraceEventDuration(categoryEnabledFlag, name, handle);
 103 }
 104
 105 } // namespace blink