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      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 WebCore {
     40 
     41 COMPILE_ASSERT(sizeof(blink::Platform::TraceEventHandle) == sizeof(TraceEvent::TraceEventHandle), TraceEventHandle_types_must_be_compatible);
     42 
     43 // The dummy variable is needed to avoid a crash when someone updates the state variables
     44 // before EventTracer::initialize() is called.
     45 long dummyTraceSamplingState = 0;
     46 long* traceSamplingState[3] = {&dummyTraceSamplingState, &dummyTraceSamplingState, &dummyTraceSamplingState };
     47 
     48 void EventTracer::initialize()
     49 {
     50     // current() might not exist in unit tests.
     51     if (!blink::Platform::current())
     52         return;
     53 
     54     traceSamplingState[0] = blink::Platform::current()->getTraceSamplingState(0);
     55     // FIXME: traceSamplingState[0] can be 0 in split-dll build. http://crbug.com/256965
     56     if (!traceSamplingState[0])
     57         traceSamplingState[0] = &dummyTraceSamplingState;
     58     traceSamplingState[1] = blink::Platform::current()->getTraceSamplingState(1);
     59     if (!traceSamplingState[1])
     60         traceSamplingState[1] = &dummyTraceSamplingState;
     61     traceSamplingState[2] = blink::Platform::current()->getTraceSamplingState(2);
     62     if (!traceSamplingState[2])
     63         traceSamplingState[2] = &dummyTraceSamplingState;
     64 }
     65 
     66 const unsigned char* EventTracer::getTraceCategoryEnabledFlag(const char* categoryName)
     67 {
     68     static const char* dummyCategoryEnabledFlag = "*";
     69     // current() might not exist in unit tests.
     70     if (!blink::Platform::current())
     71         return reinterpret_cast<const unsigned char*>(dummyCategoryEnabledFlag);
     72 
     73     return blink::Platform::current()->getTraceCategoryEnabledFlag(categoryName);
     74 }
     75 
     76 TraceEvent::TraceEventHandle EventTracer::addTraceEvent(char phase, const unsigned char* categoryEnabledFlag,
     77     const char* name, unsigned long long id, int numArgs, const char* argNames[],
     78     const unsigned char argTypes[], const unsigned long long argValues[],
     79     TraceEvent::ConvertableToTraceFormat* convertableValues[],
     80     unsigned char flags)
     81 {
     82     blink::WebConvertableToTraceFormat webConvertableValues[2];
     83     if (numArgs <= static_cast<int>(WTF_ARRAY_LENGTH(webConvertableValues))) {
     84         for (int i = 0; i < numArgs; ++i) {
     85             if (convertableValues[i])
     86                 webConvertableValues[i] = blink::WebConvertableToTraceFormat(convertableValues[i]);
     87         }
     88     } else {
     89         ASSERT_NOT_REACHED();
     90     }
     91     return blink::Platform::current()->addTraceEvent(phase, categoryEnabledFlag, name, id, numArgs, argNames, argTypes, argValues, webConvertableValues, flags);
     92 }
     93 
     94 TraceEvent::TraceEventHandle EventTracer::addTraceEvent(char phase, const unsigned char* categoryEnabledFlag,
     95     const char* name, unsigned long long id, int numArgs, const char** argNames,
     96     const unsigned char* argTypes, const unsigned long long* argValues,
     97     unsigned char flags)
     98 {
     99     return blink::Platform::current()->addTraceEvent(phase, categoryEnabledFlag, name, id, numArgs, argNames, argTypes, argValues, 0, flags);
    100 }
    101 
    102 void EventTracer::updateTraceEventDuration(const unsigned char* categoryEnabledFlag, const char* name, TraceEvent::TraceEventHandle handle)
    103 {
    104     blink::Platform::current()->updateTraceEventDuration(categoryEnabledFlag, name, handle);
    105 }
    106 
    107 } // namespace WebCore
    108